194 files changed, 178776 insertions, 0 deletions

diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig
new file mode 100644
index 000000000000..bd7cc0527999
--- /dev/null
+++ b/drivers/tty/Kconfig
@@ -0,0 +1,352 @@
+config VT
+        bool "Virtual terminal" if EXPERT
+        depends on !S390
+        select INPUT
+        default y
+        ---help---
+          If you say Y here, you will get support for terminal devices with
+          display and keyboard devices. These are called "virtual" because you
+          can run several virtual terminals (also called virtual consoles) on
+          one physical terminal. This is rather useful, for example one
+          virtual terminal can collect system messages and warnings, another
+          one can be used for a text-mode user session, and a third could run
+          an X session, all in parallel. Switching between virtual terminals
+          is done with certain key combinations, usually Alt-<function key>.
+
+          The setterm command ("man setterm") can be used to change the
+          properties (such as colors or beeping) of a virtual terminal. The
+          man page console_codes(4) ("man console_codes") contains the special
+          character sequences that can be used to change those properties
+          directly. The fonts used on virtual terminals can be changed with
+          the setfont ("man setfont") command and the key bindings are defined
+          with the loadkeys ("man loadkeys") command.
+
+          You need at least one virtual terminal device in order to make use
+          of your keyboard and monitor. Therefore, only people configuring an
+          embedded system would want to say N here in order to save some
+          memory; the only way to log into such a system is then via a serial
+          or network connection.
+
+          If unsure, say Y, or else you won't be able to do much with your new
+          shiny Linux system :-)
+
+config CONSOLE_TRANSLATIONS
+        depends on VT
+        default y
+        bool "Enable character translations in console" if EXPERT
+        ---help---
+          This enables support for font mapping and Unicode translation
+          on virtual consoles.
+
+config VT_CONSOLE
+        bool "Support for console on virtual terminal" if EXPERT
+        depends on VT
+        default y
+        ---help---
+          The system console is the device which receives all kernel messages
+          and warnings and which allows logins in single user mode. If you
+          answer Y here, a virtual terminal (the device used to interact with
+          a physical terminal) can be used as system console. This is the most
+          common mode of operations, so you should say Y here unless you want
+          the kernel messages be output only to a serial port (in which case
+          you should say Y to "Console on serial port", below).
+
+          If you do say Y here, by default the currently visible virtual
+          terminal (/dev/tty0) will be used as system console. You can change
+          that with a kernel command line option such as "console=tty3" which
+          would use the third virtual terminal as system console. (Try "man
+          bootparam" or see the documentation of your boot loader (lilo or
+          loadlin) about how to pass options to the kernel at boot time.)
+
+          If unsure, say Y.
+
+config HW_CONSOLE
+        bool
+        depends on VT && !S390 && !UML
+        default y
+
+config VT_HW_CONSOLE_BINDING
+       bool "Support for binding and unbinding console drivers"
+       depends on HW_CONSOLE
+       default n
+       ---help---
+         The virtual terminal is the device that interacts with the physical
+         terminal through console drivers. On these systems, at least one
+         console driver is loaded. In other configurations, additional console
+         drivers may be enabled, such as the framebuffer console. If more than
+         1 console driver is enabled, setting this to 'y' will allow you to
+         select the console driver that will serve as the backend for the
+         virtual terminals.
+
+         See <file:Documentation/console/console.txt> for more
+         information. For framebuffer console users, please refer to
+         <file:Documentation/fb/fbcon.txt>.
+
+config UNIX98_PTYS
+        bool "Unix98 PTY support" if EXPERT
+        default y
+        ---help---
+          A pseudo terminal (PTY) is a software device consisting of two
+          halves: a master and a slave. The slave device behaves identical to
+          a physical terminal; the master device is used by a process to
+          read data from and write data to the slave, thereby emulating a
+          terminal. Typical programs for the master side are telnet servers
+          and xterms.
+
+          Linux has traditionally used the BSD-like names /dev/ptyxx for
+          masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
+          has a number of problems. The GNU C library glibc 2.1 and later,
+          however, supports the Unix98 naming standard: in order to acquire a
+          pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
+          terminal is then made available to the process and the pseudo
+          terminal slave can be accessed as /dev/pts/<number>. What was
+          traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
+
+          All modern Linux systems use the Unix98 ptys.  Say Y unless
+          you're on an embedded system and want to conserve memory.
+
+config DEVPTS_MULTIPLE_INSTANCES
+        bool "Support multiple instances of devpts"
+        depends on UNIX98_PTYS
+        default n
+        ---help---
+          Enable support for multiple instances of devpts filesystem.
+          If you want to have isolated PTY namespaces (eg: in containers),
+          say Y here.  Otherwise, say N. If enabled, each mount of devpts
+          filesystem with the '-o newinstance' option will create an
+          independent PTY namespace.
+
+config LEGACY_PTYS
+        bool "Legacy (BSD) PTY support"
+        default y
+        ---help---
+          A pseudo terminal (PTY) is a software device consisting of two
+          halves: a master and a slave. The slave device behaves identical to
+          a physical terminal; the master device is used by a process to
+          read data from and write data to the slave, thereby emulating a
+          terminal. Typical programs for the master side are telnet servers
+          and xterms.
+
+          Linux has traditionally used the BSD-like names /dev/ptyxx
+          for masters and /dev/ttyxx for slaves of pseudo
+          terminals. This scheme has a number of problems, including
+          security.  This option enables these legacy devices; on most
+          systems, it is safe to say N.
+
+
+config LEGACY_PTY_COUNT
+        int "Maximum number of legacy PTY in use"
+        depends on LEGACY_PTYS
+        range 0 256
+        default "256"
+        ---help---
+          The maximum number of legacy PTYs that can be used at any one time.
+          The default is 256, and should be more than enough.  Embedded
+          systems may want to reduce this to save memory.
+
+          When not in use, each legacy PTY occupies 12 bytes on 32-bit
+          architectures and 24 bytes on 64-bit architectures.
+
+config BFIN_JTAG_COMM
+        tristate "Blackfin JTAG Communication"
+        depends on BLACKFIN
+        help
+          Add support for emulating a TTY device over the Blackfin JTAG.
+
+          To compile this driver as a module, choose M here: the
+          module will be called bfin_jtag_comm.
+
+config BFIN_JTAG_COMM_CONSOLE
+        bool "Console on Blackfin JTAG"
+        depends on BFIN_JTAG_COMM=y
+
+config SERIAL_NONSTANDARD
+        bool "Non-standard serial port support"
+        depends on HAS_IOMEM
+        ---help---
+          Say Y here if you have any non-standard serial boards -- boards
+          which aren't supported using the standard "dumb" serial driver.
+          This includes intelligent serial boards such as Cyclades,
+          Digiboards, etc. These are usually used for systems that need many
+          serial ports because they serve many terminals or dial-in
+          connections.
+
+          Note that the answer to this question won't directly affect the
+          kernel: saying N will just cause the configurator to skip all
+          the questions about non-standard serial boards.
+
+          Most people can say N here.
+
+config ROCKETPORT
+        tristate "Comtrol RocketPort support"
+        depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
+        help
+          This driver supports Comtrol RocketPort and RocketModem PCI boards.   
+          These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
+          modems.  For information about the RocketPort/RocketModem  boards
+          and this driver read <file:Documentation/serial/rocket.txt>.
+
+          To compile this driver as a module, choose M here: the
+          module will be called rocket.
+
+          If you want to compile this driver into the kernel, say Y here.  If
+          you don't have a Comtrol RocketPort/RocketModem card installed, say N.
+
+config CYCLADES
+        tristate "Cyclades async mux support"
+        depends on SERIAL_NONSTANDARD && (PCI || ISA)
+        select FW_LOADER
+        ---help---
+          This driver supports Cyclades Z and Y multiserial boards.
+          You would need something like this to connect more than two modems to
+          your Linux box, for instance in order to become a dial-in server.
+
+          For information about the Cyclades-Z card, read
+          <file:Documentation/serial/README.cycladesZ>.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cyclades.
+
+          If you haven't heard about it, it's safe to say N.
+
+config CYZ_INTR
+        bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
+        depends on EXPERIMENTAL && CYCLADES
+        help
+          The Cyclades-Z family of multiport cards allows 2 (two) driver op
+          modes: polling and interrupt. In polling mode, the driver will check
+          the status of the Cyclades-Z ports every certain amount of time
+          (which is called polling cycle and is configurable). In interrupt
+          mode, it will use an interrupt line (IRQ) in order to check the
+          status of the Cyclades-Z ports. The default op mode is polling. If
+          unsure, say N.
+
+config MOXA_INTELLIO
+        tristate "Moxa Intellio support"
+        depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
+        select FW_LOADER
+        help
+          Say Y here if you have a Moxa Intellio multiport serial card.
+
+          To compile this driver as a module, choose M here: the
+          module will be called moxa.
+
+config MOXA_SMARTIO
+        tristate "Moxa SmartIO support v. 2.0"
+        depends on SERIAL_NONSTANDARD && (PCI || EISA || ISA)
+        help
+          Say Y here if you have a Moxa SmartIO multiport serial card and/or
+          want to help develop a new version of this driver.
+
+          This is upgraded (1.9.1) driver from original Moxa drivers with
+          changes finally resulting in PCI probing.
+
+          This driver can also be built as a module. The module will be called
+          mxser. If you want to do that, say M here.
+
+config SYNCLINK
+        tristate "Microgate SyncLink card support"
+        depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
+        help
+          Provides support for the SyncLink ISA and PCI multiprotocol serial
+          adapters. These adapters support asynchronous and HDLC bit
+          synchronous communication up to 10Mbps (PCI adapter).
+
+          This driver can only be built as a module ( = code which can be
+          inserted in and removed from the running kernel whenever you want).
+          The module will be called synclink.  If you want to do that, say M
+          here.
+
+config SYNCLINKMP
+        tristate "SyncLink Multiport support"
+        depends on SERIAL_NONSTANDARD && PCI
+        help
+          Enable support for the SyncLink Multiport (2 or 4 ports)
+          serial adapter, running asynchronous and HDLC communications up
+          to 2.048Mbps. Each ports is independently selectable for
+          RS-232, V.35, RS-449, RS-530, and X.21
+
+          This driver may be built as a module ( = code which can be
+          inserted in and removed from the running kernel whenever you want).
+          The module will be called synclinkmp.  If you want to do that, say M
+          here.
+
+config SYNCLINK_GT
+        tristate "SyncLink GT/AC support"
+        depends on SERIAL_NONSTANDARD && PCI
+        help
+          Support for SyncLink GT and SyncLink AC families of
+          synchronous and asynchronous serial adapters
+          manufactured by Microgate Systems, Ltd. (www.microgate.com)
+
+config NOZOMI
+        tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
+        depends on PCI && EXPERIMENTAL
+        help
+          If you have a HSDPA driver Broadband Wireless Data Card -
+          Globe Trotter PCMCIA card, say Y here.
+
+          To compile this driver as a module, choose M here, the module
+          will be called nozomi.
+
+config ISI
+        tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
+        depends on SERIAL_NONSTANDARD && PCI
+        select FW_LOADER
+        help
+          This is a driver for the Multi-Tech cards which provide several
+          serial ports.  The driver is experimental and can currently only be
+          built as a module. The module will be called isicom.
+          If you want to do that, choose M here.
+
+config N_HDLC
+        tristate "HDLC line discipline support"
+        depends on SERIAL_NONSTANDARD
+        help
+          Allows synchronous HDLC communications with tty device drivers that
+          support synchronous HDLC such as the Microgate SyncLink adapter.
+
+          This driver can be built as a module ( = code which can be
+          inserted in and removed from the running kernel whenever you want).
+          The module will be called n_hdlc. If you want to do that, say M
+          here.
+
+config N_GSM
+        tristate "GSM MUX line discipline support (EXPERIMENTAL)"
+        depends on EXPERIMENTAL
+        depends on NET
+        help
+          This line discipline provides support for the GSM MUX protocol and
+          presents the mux as a set of 61 individual tty devices.
+
+config TRACE_ROUTER
+        tristate "Trace data router for MIPI P1149.7 cJTAG standard"
+        depends on TRACE_SINK
+        default n
+        help
+          The trace router uses the Linux tty line discipline framework to
+          route trace data coming from a tty port (say UART for example) to
+          the trace sink line discipline driver and to another tty port (say
+          USB). This is part of a solution for the MIPI P1149.7, compact JTAG,
+          standard, which is for debugging mobile devices. The PTI driver in
+          drivers/misc/pti.c defines the majority of this MIPI solution.
+
+          You should select this driver if the target kernel is meant for
+          a mobile device containing a modem.  Then you will need to select
+          "Trace data sink for MIPI P1149.7 cJTAG standard" line discipline
+          driver.
+
+config TRACE_SINK
+        tristate "Trace data sink for MIPI P1149.7 cJTAG standard"
+        default n
+        help
+          The trace sink uses the Linux line discipline framework to receive
+          trace data coming from the trace router line discipline driver
+          to a user-defined tty port target, like USB.
+          This is to provide a way to extract modem trace data on
+          devices that do not have a PTI HW module, or just need modem
+          trace data to come out of a different HW output port.
+          This is part of a solution for the P1149.7, compact JTAG, standard.
+
+          If you select this option, you need to select
+          "Trace data router for MIPI P1149.7 cJTAG standard".
diff --git a/drivers/tty/Makefile b/drivers/tty/Makefile
new file mode 100644
index 000000000000..ea89b0bd15fe
--- /dev/null
+++ b/drivers/tty/Makefile
@@ -0,0 +1,30 @@
+obj-y                           += tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \
+                                   tty_buffer.o tty_port.o tty_mutex.o
+obj-$(CONFIG_LEGACY_PTYS)       += pty.o
+obj-$(CONFIG_UNIX98_PTYS)       += pty.o
+obj-$(CONFIG_AUDIT)             += tty_audit.o
+obj-$(CONFIG_MAGIC_SYSRQ)       += sysrq.o
+obj-$(CONFIG_N_HDLC)            += n_hdlc.o
+obj-$(CONFIG_N_GSM)             += n_gsm.o
+obj-$(CONFIG_TRACE_ROUTER)      += n_tracerouter.o
+obj-$(CONFIG_TRACE_SINK)        += n_tracesink.o
+obj-$(CONFIG_R3964)             += n_r3964.o
+
+obj-y                           += vt/
+obj-$(CONFIG_HVC_DRIVER)        += hvc/
+obj-y                           += serial/
+
+# tty drivers
+obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
+obj-$(CONFIG_BFIN_JTAG_COMM)    += bfin_jtag_comm.o
+obj-$(CONFIG_CYCLADES)          += cyclades.o
+obj-$(CONFIG_ISI)               += isicom.o
+obj-$(CONFIG_MOXA_INTELLIO)     += moxa.o
+obj-$(CONFIG_MOXA_SMARTIO)      += mxser.o
+obj-$(CONFIG_NOZOMI)            += nozomi.o
+obj-$(CONFIG_ROCKETPORT)        += rocket.o
+obj-$(CONFIG_SYNCLINK_GT)       += synclink_gt.o
+obj-$(CONFIG_SYNCLINKMP)        += synclinkmp.o
+obj-$(CONFIG_SYNCLINK)          += synclink.o
+
+obj-y += ipwireless/
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
new file mode 100644
index 000000000000..220579592c20
--- /dev/null
+++ b/drivers/tty/amiserial.c
@@ -0,0 +1,2176 @@
+/*
+ * Serial driver for the amiga builtin port.
+ *
+ * This code was created by taking serial.c version 4.30 from kernel
+ * release 2.3.22, replacing all hardware related stuff with the
+ * corresponding amiga hardware actions, and removing all irrelevant
+ * code. As a consequence, it uses many of the constants and names
+ * associated with the registers and bits of 16550 compatible UARTS -
+ * but only to keep track of status, etc in the state variables. It
+ * was done this was to make it easier to keep the code in line with
+ * (non hardware specific) changes to serial.c.
+ *
+ * The port is registered with the tty driver as minor device 64, and
+ * therefore other ports should should only use 65 upwards.
+ *
+ * Richard Lucock 28/12/99
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 
+ *              1998, 1999  Theodore Ts'o
+ *
+ */
+
+/*
+ * Serial driver configuration section.  Here are the various options:
+ *
+ * SERIAL_PARANOIA_CHECK
+ *              Check the magic number for the async_structure where
+ *              ever possible.
+ */
+
+#include <linux/delay.h>
+
+#undef SERIAL_PARANOIA_CHECK
+#define SERIAL_DO_RESTART
+
+/* Set of debugging defines */
+
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+
+/* Sanity checks */
+
+#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
+#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
+ tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
+#else
+#define DBG_CNT(s)
+#endif
+
+/*
+ * End of serial driver configuration section.
+ */
+
+#include <linux/module.h>
+
+#include <linux/types.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/serial_reg.h>
+static char *serial_version = "4.30";
+
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/console.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+
+#include <asm/setup.h>
+
+#include <asm/system.h>
+
+#include <asm/irq.h>
+
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+
+#define custom amiga_custom
+static char *serial_name = "Amiga-builtin serial driver";
+
+static struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+static struct async_struct *IRQ_ports;
+
+static unsigned char current_ctl_bits;
+
+static void change_speed(struct async_struct *info, struct ktermios *old);
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
+
+
+static struct serial_state rs_table[1];
+
+#define NR_PORTS ARRAY_SIZE(rs_table)
+
+#include <asm/uaccess.h>
+
+#define serial_isroot() (capable(CAP_SYS_ADMIN))
+
+
+static inline int serial_paranoia_check(struct async_struct *info,
+                                        char *name, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+        static const char *badmagic =
+                "Warning: bad magic number for serial struct (%s) in %s\n";
+        static const char *badinfo =
+                "Warning: null async_struct for (%s) in %s\n";
+
+        if (!info) {
+                printk(badinfo, name, routine);
+                return 1;
+        }
+        if (info->magic != SERIAL_MAGIC) {
+                printk(badmagic, name, routine);
+                return 1;
+        }
+#endif
+        return 0;
+}
+
+/* some serial hardware definitions */
+#define SDR_OVRUN   (1<<15)
+#define SDR_RBF     (1<<14)
+#define SDR_TBE     (1<<13)
+#define SDR_TSRE    (1<<12)
+
+#define SERPER_PARENB    (1<<15)
+
+#define AC_SETCLR   (1<<15)
+#define AC_UARTBRK  (1<<11)
+
+#define SER_DTR     (1<<7)
+#define SER_RTS     (1<<6)
+#define SER_DCD     (1<<5)
+#define SER_CTS     (1<<4)
+#define SER_DSR     (1<<3)
+
+static __inline__ void rtsdtr_ctrl(int bits)
+{
+    ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void rs_stop(struct tty_struct *tty)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_stop"))
+                return;
+
+        local_irq_save(flags);
+        if (info->IER & UART_IER_THRI) {
+                info->IER &= ~UART_IER_THRI;
+                /* disable Tx interrupt and remove any pending interrupts */
+                custom.intena = IF_TBE;
+                mb();
+                custom.intreq = IF_TBE;
+                mb();
+        }
+        local_irq_restore(flags);
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_start"))
+                return;
+
+        local_irq_save(flags);
+        if (info->xmit.head != info->xmit.tail
+            && info->xmit.buf
+            && !(info->IER & UART_IER_THRI)) {
+                info->IER |= UART_IER_THRI;
+                custom.intena = IF_SETCLR | IF_TBE;
+                mb();
+                /* set a pending Tx Interrupt, transmitter should restart now */
+                custom.intreq = IF_SETCLR | IF_TBE;
+                mb();
+        }
+        local_irq_restore(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines.  All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt().  They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off.  People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible.  After you are done making modifications, it is not a bad
+ * idea to do:
+ * 
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static void rs_sched_event(struct async_struct *info,
+                           int event)
+{
+        info->event |= 1 << event;
+        tasklet_schedule(&info->tlet);
+}
+
+static void receive_chars(struct async_struct *info)
+{
+        int status;
+        int serdatr;
+        struct tty_struct *tty = info->tty;
+        unsigned char ch, flag;
+        struct  async_icount *icount;
+        int oe = 0;
+
+        icount = &info->state->icount;
+
+        status = UART_LSR_DR; /* We obviously have a character! */
+        serdatr = custom.serdatr;
+        mb();
+        custom.intreq = IF_RBF;
+        mb();
+
+        if((serdatr & 0x1ff) == 0)
+            status |= UART_LSR_BI;
+        if(serdatr & SDR_OVRUN)
+            status |= UART_LSR_OE;
+
+        ch = serdatr & 0xff;
+        icount->rx++;
+
+#ifdef SERIAL_DEBUG_INTR
+        printk("DR%02x:%02x...", ch, status);
+#endif
+        flag = TTY_NORMAL;
+
+        /*
+         * We don't handle parity or frame errors - but I have left
+         * the code in, since I'm not sure that the errors can't be
+         * detected.
+         */
+
+        if (status & (UART_LSR_BI | UART_LSR_PE |
+                      UART_LSR_FE | UART_LSR_OE)) {
+          /*
+           * For statistics only
+           */
+          if (status & UART_LSR_BI) {
+            status &= ~(UART_LSR_FE | UART_LSR_PE);
+            icount->brk++;
+          } else if (status & UART_LSR_PE)
+            icount->parity++;
+          else if (status & UART_LSR_FE)
+            icount->frame++;
+          if (status & UART_LSR_OE)
+            icount->overrun++;
+
+          /*
+           * Now check to see if character should be
+           * ignored, and mask off conditions which
+           * should be ignored.
+           */
+          if (status & info->ignore_status_mask)
+            goto out;
+
+          status &= info->read_status_mask;
+
+          if (status & (UART_LSR_BI)) {
+#ifdef SERIAL_DEBUG_INTR
+            printk("handling break....");
+#endif
+            flag = TTY_BREAK;
+            if (info->flags & ASYNC_SAK)
+              do_SAK(tty);
+          } else if (status & UART_LSR_PE)
+            flag = TTY_PARITY;
+          else if (status & UART_LSR_FE)
+            flag = TTY_FRAME;
+          if (status & UART_LSR_OE) {
+            /*
+             * Overrun is special, since it's
+             * reported immediately, and doesn't
+             * affect the current character
+             */
+             oe = 1;
+          }
+        }
+        tty_insert_flip_char(tty, ch, flag);
+        if (oe == 1)
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+        tty_flip_buffer_push(tty);
+out:
+        return;
+}
+
+static void transmit_chars(struct async_struct *info)
+{
+        custom.intreq = IF_TBE;
+        mb();
+        if (info->x_char) {
+                custom.serdat = info->x_char | 0x100;
+                mb();
+                info->state->icount.tx++;
+                info->x_char = 0;
+                return;
+        }
+        if (info->xmit.head == info->xmit.tail
+            || info->tty->stopped
+            || info->tty->hw_stopped) {
+                info->IER &= ~UART_IER_THRI;
+                custom.intena = IF_TBE;
+                mb();
+                return;
+        }
+
+        custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
+        mb();
+        info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
+        info->state->icount.tx++;
+
+        if (CIRC_CNT(info->xmit.head,
+                     info->xmit.tail,
+                     SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
+                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+#ifdef SERIAL_DEBUG_INTR
+        printk("THRE...");
+#endif
+        if (info->xmit.head == info->xmit.tail) {
+                custom.intena = IF_TBE;
+                mb();
+                info->IER &= ~UART_IER_THRI;
+        }
+}
+
+static void check_modem_status(struct async_struct *info)
+{
+        unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
+        unsigned char dstatus;
+        struct  async_icount *icount;
+
+        /* Determine bits that have changed */
+        dstatus = status ^ current_ctl_bits;
+        current_ctl_bits = status;
+
+        if (dstatus) {
+                icount = &info->state->icount;
+                /* update input line counters */
+                if (dstatus & SER_DSR)
+                        icount->dsr++;
+                if (dstatus & SER_DCD) {
+                        icount->dcd++;
+#ifdef CONFIG_HARD_PPS
+                        if ((info->flags & ASYNC_HARDPPS_CD) &&
+                            !(status & SER_DCD))
+                                hardpps();
+#endif
+                }
+                if (dstatus & SER_CTS)
+                        icount->cts++;
+                wake_up_interruptible(&info->delta_msr_wait);
+        }
+
+        if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
+#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
+                printk("ttyS%d CD now %s...", info->line,
+                       (!(status & SER_DCD)) ? "on" : "off");
+#endif
+                if (!(status & SER_DCD))
+                        wake_up_interruptible(&info->open_wait);
+                else {
+#ifdef SERIAL_DEBUG_OPEN
+                        printk("doing serial hangup...");
+#endif
+                        if (info->tty)
+                                tty_hangup(info->tty);
+                }
+        }
+        if (info->flags & ASYNC_CTS_FLOW) {
+                if (info->tty->hw_stopped) {
+                        if (!(status & SER_CTS)) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+                                printk("CTS tx start...");
+#endif
+                                info->tty->hw_stopped = 0;
+                                info->IER |= UART_IER_THRI;
+                                custom.intena = IF_SETCLR | IF_TBE;
+                                mb();
+                                /* set a pending Tx Interrupt, transmitter should restart now */
+                                custom.intreq = IF_SETCLR | IF_TBE;
+                                mb();
+                                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+                                return;
+                        }
+                } else {
+                        if ((status & SER_CTS)) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+                                printk("CTS tx stop...");
+#endif
+                                info->tty->hw_stopped = 1;
+                                info->IER &= ~UART_IER_THRI;
+                                /* disable Tx interrupt and remove any pending interrupts */
+                                custom.intena = IF_TBE;
+                                mb();
+                                custom.intreq = IF_TBE;
+                                mb();
+                        }
+                }
+        }
+}
+
+static irqreturn_t ser_vbl_int( int irq, void *data)
+{
+        /* vbl is just a periodic interrupt we tie into to update modem status */
+        struct async_struct * info = IRQ_ports;
+        /*
+         * TBD - is it better to unregister from this interrupt or to
+         * ignore it if MSI is clear ?
+         */
+        if(info->IER & UART_IER_MSI)
+          check_modem_status(info);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t ser_rx_int(int irq, void *dev_id)
+{
+        struct async_struct * info;
+
+#ifdef SERIAL_DEBUG_INTR
+        printk("ser_rx_int...");
+#endif
+
+        info = IRQ_ports;
+        if (!info || !info->tty)
+                return IRQ_NONE;
+
+        receive_chars(info);
+        info->last_active = jiffies;
+#ifdef SERIAL_DEBUG_INTR
+        printk("end.\n");
+#endif
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t ser_tx_int(int irq, void *dev_id)
+{
+        struct async_struct * info;
+
+        if (custom.serdatr & SDR_TBE) {
+#ifdef SERIAL_DEBUG_INTR
+          printk("ser_tx_int...");
+#endif
+
+          info = IRQ_ports;
+          if (!info || !info->tty)
+                return IRQ_NONE;
+
+          transmit_chars(info);
+          info->last_active = jiffies;
+#ifdef SERIAL_DEBUG_INTR
+          printk("end.\n");
+#endif
+        }
+        return IRQ_HANDLED;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+
+static void do_softint(unsigned long private_)
+{
+        struct async_struct     *info = (struct async_struct *) private_;
+        struct tty_struct       *tty;
+
+        tty = info->tty;
+        if (!tty)
+                return;
+
+        if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
+                tty_wakeup(tty);
+}
+
+/*
+ * ---------------------------------------------------------------
+ * Low level utility subroutines for the serial driver:  routines to
+ * figure out the appropriate timeout for an interrupt chain, routines
+ * to initialize and startup a serial port, and routines to shutdown a
+ * serial port.  Useful stuff like that.
+ * ---------------------------------------------------------------
+ */
+
+static int startup(struct async_struct * info)
+{
+        unsigned long flags;
+        int     retval=0;
+        unsigned long page;
+
+        page = get_zeroed_page(GFP_KERNEL);
+        if (!page)
+                return -ENOMEM;
+
+        local_irq_save(flags);
+
+        if (info->flags & ASYNC_INITIALIZED) {
+                free_page(page);
+                goto errout;
+        }
+
+        if (info->xmit.buf)
+                free_page(page);
+        else
+                info->xmit.buf = (unsigned char *) page;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("starting up ttys%d ...", info->line);
+#endif
+
+        /* Clear anything in the input buffer */
+
+        custom.intreq = IF_RBF;
+        mb();
+
+        retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
+        if (retval) {
+          if (serial_isroot()) {
+            if (info->tty)
+              set_bit(TTY_IO_ERROR,
+                      &info->tty->flags);
+            retval = 0;
+          }
+          goto errout;
+        }
+
+        /* enable both Rx and Tx interrupts */
+        custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
+        mb();
+        info->IER = UART_IER_MSI;
+
+        /* remember current state of the DCD and CTS bits */
+        current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
+
+        IRQ_ports = info;
+
+        info->MCR = 0;
+        if (info->tty->termios->c_cflag & CBAUD)
+          info->MCR = SER_DTR | SER_RTS;
+        rtsdtr_ctrl(info->MCR);
+
+        if (info->tty)
+                clear_bit(TTY_IO_ERROR, &info->tty->flags);
+        info->xmit.head = info->xmit.tail = 0;
+
+        /*
+         * Set up the tty->alt_speed kludge
+         */
+        if (info->tty) {
+                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+                        info->tty->alt_speed = 57600;
+                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+                        info->tty->alt_speed = 115200;
+                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+                        info->tty->alt_speed = 230400;
+                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+                        info->tty->alt_speed = 460800;
+        }
+
+        /*
+         * and set the speed of the serial port
+         */
+        change_speed(info, NULL);
+
+        info->flags |= ASYNC_INITIALIZED;
+        local_irq_restore(flags);
+        return 0;
+
+errout:
+        local_irq_restore(flags);
+        return retval;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void shutdown(struct async_struct * info)
+{
+        unsigned long   flags;
+        struct serial_state *state;
+
+        if (!(info->flags & ASYNC_INITIALIZED))
+                return;
+
+        state = info->state;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("Shutting down serial port %d ....\n", info->line);
+#endif
+
+        local_irq_save(flags); /* Disable interrupts */
+
+        /*
+         * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+         * here so the queue might never be waken up
+         */
+        wake_up_interruptible(&info->delta_msr_wait);
+
+        IRQ_ports = NULL;
+
+        /*
+         * Free the IRQ, if necessary
+         */
+        free_irq(IRQ_AMIGA_VERTB, info);
+
+        if (info->xmit.buf) {
+                free_page((unsigned long) info->xmit.buf);
+                info->xmit.buf = NULL;
+        }
+
+        info->IER = 0;
+        custom.intena = IF_RBF | IF_TBE;
+        mb();
+
+        /* disable break condition */
+        custom.adkcon = AC_UARTBRK;
+        mb();
+
+        if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
+                info->MCR &= ~(SER_DTR|SER_RTS);
+        rtsdtr_ctrl(info->MCR);
+
+        if (info->tty)
+                set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+        info->flags &= ~ASYNC_INITIALIZED;
+        local_irq_restore(flags);
+}
+
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(struct async_struct *info,
+                         struct ktermios *old_termios)
+{
+        int     quot = 0, baud_base, baud;
+        unsigned cflag, cval = 0;
+        int     bits;
+        unsigned long   flags;
+
+        if (!info->tty || !info->tty->termios)
+                return;
+        cflag = info->tty->termios->c_cflag;
+
+        /* Byte size is always 8 bits plus parity bit if requested */
+
+        cval = 3; bits = 10;
+        if (cflag & CSTOPB) {
+                cval |= 0x04;
+                bits++;
+        }
+        if (cflag & PARENB) {
+                cval |= UART_LCR_PARITY;
+                bits++;
+        }
+        if (!(cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+        if (cflag & CMSPAR)
+                cval |= UART_LCR_SPAR;
+#endif
+
+        /* Determine divisor based on baud rate */
+        baud = tty_get_baud_rate(info->tty);
+        if (!baud)
+                baud = 9600;    /* B0 transition handled in rs_set_termios */
+        baud_base = info->state->baud_base;
+        if (baud == 38400 &&
+            ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
+                quot = info->state->custom_divisor;
+        else {
+                if (baud == 134)
+                        /* Special case since 134 is really 134.5 */
+                        quot = (2*baud_base / 269);
+                else if (baud)
+                        quot = baud_base / baud;
+        }
+        /* If the quotient is zero refuse the change */
+        if (!quot && old_termios) {
+                /* FIXME: Will need updating for new tty in the end */
+                info->tty->termios->c_cflag &= ~CBAUD;
+                info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
+                baud = tty_get_baud_rate(info->tty);
+                if (!baud)
+                        baud = 9600;
+                if (baud == 38400 &&
+                    ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
+                        quot = info->state->custom_divisor;
+                else {
+                        if (baud == 134)
+                                /* Special case since 134 is really 134.5 */
+                                quot = (2*baud_base / 269);
+                        else if (baud)
+                                quot = baud_base / baud;
+                }
+        }
+        /* As a last resort, if the quotient is zero, default to 9600 bps */
+        if (!quot)
+                quot = baud_base / 9600;
+        info->quot = quot;
+        info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
+        info->timeout += HZ/50;         /* Add .02 seconds of slop */
+
+        /* CTS flow control flag and modem status interrupts */
+        info->IER &= ~UART_IER_MSI;
+        if (info->flags & ASYNC_HARDPPS_CD)
+                info->IER |= UART_IER_MSI;
+        if (cflag & CRTSCTS) {
+                info->flags |= ASYNC_CTS_FLOW;
+                info->IER |= UART_IER_MSI;
+        } else
+                info->flags &= ~ASYNC_CTS_FLOW;
+        if (cflag & CLOCAL)
+                info->flags &= ~ASYNC_CHECK_CD;
+        else {
+                info->flags |= ASYNC_CHECK_CD;
+                info->IER |= UART_IER_MSI;
+        }
+        /* TBD:
+         * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
+         */
+
+        /*
+         * Set up parity check flag
+         */
+
+        info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
+        if (I_INPCK(info->tty))
+                info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
+                info->read_status_mask |= UART_LSR_BI;
+
+        /*
+         * Characters to ignore
+         */
+        info->ignore_status_mask = 0;
+        if (I_IGNPAR(info->tty))
+                info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+        if (I_IGNBRK(info->tty)) {
+                info->ignore_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignore parity and break indicators, ignore 
+                 * overruns too.  (For real raw support).
+                 */
+                if (I_IGNPAR(info->tty))
+                        info->ignore_status_mask |= UART_LSR_OE;
+        }
+        /*
+         * !!! ignore all characters if CREAD is not set
+         */
+        if ((cflag & CREAD) == 0)
+                info->ignore_status_mask |= UART_LSR_DR;
+        local_irq_save(flags);
+
+        {
+          short serper;
+
+        /* Set up the baud rate */
+          serper = quot - 1;
+
+        /* Enable or disable parity bit */
+
+        if(cval & UART_LCR_PARITY)
+          serper |= (SERPER_PARENB);
+
+        custom.serper = serper;
+        mb();
+        }
+
+        info->LCR = cval;                               /* Save LCR */
+        local_irq_restore(flags);
+}
+
+static int rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct async_struct *info;
+        unsigned long flags;
+
+        info = tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_put_char"))
+                return 0;
+
+        if (!info->xmit.buf)
+                return 0;
+
+        local_irq_save(flags);
+        if (CIRC_SPACE(info->xmit.head,
+                       info->xmit.tail,
+                       SERIAL_XMIT_SIZE) == 0) {
+                local_irq_restore(flags);
+                return 0;
+        }
+
+        info->xmit.buf[info->xmit.head++] = ch;
+        info->xmit.head &= SERIAL_XMIT_SIZE-1;
+        local_irq_restore(flags);
+        return 1;
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
+                return;
+
+        if (info->xmit.head == info->xmit.tail
+            || tty->stopped
+            || tty->hw_stopped
+            || !info->xmit.buf)
+                return;
+
+        local_irq_save(flags);
+        info->IER |= UART_IER_THRI;
+        custom.intena = IF_SETCLR | IF_TBE;
+        mb();
+        /* set a pending Tx Interrupt, transmitter should restart now */
+        custom.intreq = IF_SETCLR | IF_TBE;
+        mb();
+        local_irq_restore(flags);
+}
+
+static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
+{
+        int     c, ret = 0;
+        struct async_struct *info;
+        unsigned long flags;
+
+        info = tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_write"))
+                return 0;
+
+        if (!info->xmit.buf)
+                return 0;
+
+        local_irq_save(flags);
+        while (1) {
+                c = CIRC_SPACE_TO_END(info->xmit.head,
+                                      info->xmit.tail,
+                                      SERIAL_XMIT_SIZE);
+                if (count < c)
+                        c = count;
+                if (c <= 0) {
+                        break;
+                }
+                memcpy(info->xmit.buf + info->xmit.head, buf, c);
+                info->xmit.head = ((info->xmit.head + c) &
+                                   (SERIAL_XMIT_SIZE-1));
+                buf += c;
+                count -= c;
+                ret += c;
+        }
+        local_irq_restore(flags);
+
+        if (info->xmit.head != info->xmit.tail
+            && !tty->stopped
+            && !tty->hw_stopped
+            && !(info->IER & UART_IER_THRI)) {
+                info->IER |= UART_IER_THRI;
+                local_irq_disable();
+                custom.intena = IF_SETCLR | IF_TBE;
+                mb();
+                /* set a pending Tx Interrupt, transmitter should restart now */
+                custom.intreq = IF_SETCLR | IF_TBE;
+                mb();
+                local_irq_restore(flags);
+        }
+        return ret;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+        struct async_struct *info = tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_write_room"))
+                return 0;
+        return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+        struct async_struct *info = tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
+                return 0;
+        return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
+                return;
+        local_irq_save(flags);
+        info->xmit.head = info->xmit.tail = 0;
+        local_irq_restore(flags);
+        tty_wakeup(tty);
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void rs_send_xchar(struct tty_struct *tty, char ch)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_send_char"))
+                return;
+
+        info->x_char = ch;
+        if (ch) {
+                /* Make sure transmit interrupts are on */
+
+                /* Check this ! */
+                local_irq_save(flags);
+                if(!(custom.intenar & IF_TBE)) {
+                    custom.intena = IF_SETCLR | IF_TBE;
+                    mb();
+                    /* set a pending Tx Interrupt, transmitter should restart now */
+                    custom.intreq = IF_SETCLR | IF_TBE;
+                    mb();
+                }
+                local_irq_restore(flags);
+
+                info->IER |= UART_IER_THRI;
+        }
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ * 
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_throttle(struct tty_struct * tty)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+        char    buf[64];
+
+        printk("throttle %s: %d....\n", tty_name(tty, buf),
+               tty->ldisc.chars_in_buffer(tty));
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "rs_throttle"))
+                return;
+
+        if (I_IXOFF(tty))
+                rs_send_xchar(tty, STOP_CHAR(tty));
+
+        if (tty->termios->c_cflag & CRTSCTS)
+                info->MCR &= ~SER_RTS;
+
+        local_irq_save(flags);
+        rtsdtr_ctrl(info->MCR);
+        local_irq_restore(flags);
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+#ifdef SERIAL_DEBUG_THROTTLE
+        char    buf[64];
+
+        printk("unthrottle %s: %d....\n", tty_name(tty, buf),
+               tty->ldisc.chars_in_buffer(tty));
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
+                return;
+
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        rs_send_xchar(tty, START_CHAR(tty));
+        }
+        if (tty->termios->c_cflag & CRTSCTS)
+                info->MCR |= SER_RTS;
+        local_irq_save(flags);
+        rtsdtr_ctrl(info->MCR);
+        local_irq_restore(flags);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct async_struct * info,
+                           struct serial_struct __user * retinfo)
+{
+        struct serial_struct tmp;
+        struct serial_state *state = info->state;
+   
+        if (!retinfo)
+                return -EFAULT;
+        memset(&tmp, 0, sizeof(tmp));
+        tty_lock();
+        tmp.type = state->type;
+        tmp.line = state->line;
+        tmp.port = state->port;
+        tmp.irq = state->irq;
+        tmp.flags = state->flags;
+        tmp.xmit_fifo_size = state->xmit_fifo_size;
+        tmp.baud_base = state->baud_base;
+        tmp.close_delay = state->close_delay;
+        tmp.closing_wait = state->closing_wait;
+        tmp.custom_divisor = state->custom_divisor;
+        tty_unlock();
+        if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
+                return -EFAULT;
+        return 0;
+}
+
+static int set_serial_info(struct async_struct * info,
+                           struct serial_struct __user * new_info)
+{
+        struct serial_struct new_serial;
+        struct serial_state old_state, *state;
+        unsigned int            change_irq,change_port;
+        int                     retval = 0;
+
+        if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
+                return -EFAULT;
+
+        tty_lock();
+        state = info->state;
+        old_state = *state;
+  
+        change_irq = new_serial.irq != state->irq;
+        change_port = (new_serial.port != state->port);
+        if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
+          tty_unlock();
+          return -EINVAL;
+        }
+  
+        if (!serial_isroot()) {
+                if ((new_serial.baud_base != state->baud_base) ||
+                    (new_serial.close_delay != state->close_delay) ||
+                    (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
+                    ((new_serial.flags & ~ASYNC_USR_MASK) !=
+                     (state->flags & ~ASYNC_USR_MASK)))
+                        return -EPERM;
+                state->flags = ((state->flags & ~ASYNC_USR_MASK) |
+                               (new_serial.flags & ASYNC_USR_MASK));
+                info->flags = ((info->flags & ~ASYNC_USR_MASK) |
+                               (new_serial.flags & ASYNC_USR_MASK));
+                state->custom_divisor = new_serial.custom_divisor;
+                goto check_and_exit;
+        }
+
+        if (new_serial.baud_base < 9600) {
+                tty_unlock();
+                return -EINVAL;
+        }
+
+        /*
+         * OK, past this point, all the error checking has been done.
+         * At this point, we start making changes.....
+         */
+
+        state->baud_base = new_serial.baud_base;
+        state->flags = ((state->flags & ~ASYNC_FLAGS) |
+                        (new_serial.flags & ASYNC_FLAGS));
+        info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
+                       (info->flags & ASYNC_INTERNAL_FLAGS));
+        state->custom_divisor = new_serial.custom_divisor;
+        state->close_delay = new_serial.close_delay * HZ/100;
+        state->closing_wait = new_serial.closing_wait * HZ/100;
+        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+check_and_exit:
+        if (info->flags & ASYNC_INITIALIZED) {
+                if (((old_state.flags & ASYNC_SPD_MASK) !=
+                     (state->flags & ASYNC_SPD_MASK)) ||
+                    (old_state.custom_divisor != state->custom_divisor)) {
+                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+                                info->tty->alt_speed = 57600;
+                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+                                info->tty->alt_speed = 115200;
+                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+                                info->tty->alt_speed = 230400;
+                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+                                info->tty->alt_speed = 460800;
+                        change_speed(info, NULL);
+                }
+        } else
+                retval = startup(info);
+        tty_unlock();
+        return retval;
+}
+
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space. 
+ */
+static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
+{
+        unsigned char status;
+        unsigned int result;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        status = custom.serdatr;
+        mb();
+        local_irq_restore(flags);
+        result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
+        if (copy_to_user(value, &result, sizeof(int)))
+                return -EFAULT;
+        return 0;
+}
+
+
+static int rs_tiocmget(struct tty_struct *tty)
+{
+        struct async_struct * info = tty->driver_data;
+        unsigned char control, status;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+                return -ENODEV;
+        if (tty->flags & (1 << TTY_IO_ERROR))
+                return -EIO;
+
+        control = info->MCR;
+        local_irq_save(flags);
+        status = ciab.pra;
+        local_irq_restore(flags);
+        return    ((control & SER_RTS) ? TIOCM_RTS : 0)
+                | ((control & SER_DTR) ? TIOCM_DTR : 0)
+                | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
+                | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
+                | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
+}
+
+static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
+                                                unsigned int clear)
+{
+        struct async_struct * info = tty->driver_data;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+                return -ENODEV;
+        if (tty->flags & (1 << TTY_IO_ERROR))
+                return -EIO;
+
+        local_irq_save(flags);
+        if (set & TIOCM_RTS)
+                info->MCR |= SER_RTS;
+        if (set & TIOCM_DTR)
+                info->MCR |= SER_DTR;
+        if (clear & TIOCM_RTS)
+                info->MCR &= ~SER_RTS;
+        if (clear & TIOCM_DTR)
+                info->MCR &= ~SER_DTR;
+        rtsdtr_ctrl(info->MCR);
+        local_irq_restore(flags);
+        return 0;
+}
+
+/*
+ * rs_break() --- routine which turns the break handling on or off
+ */
+static int rs_break(struct tty_struct *tty, int break_state)
+{
+        struct async_struct * info = tty->driver_data;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_break"))
+                return -EINVAL;
+
+        local_irq_save(flags);
+        if (break_state == -1)
+          custom.adkcon = AC_SETCLR | AC_UARTBRK;
+        else
+          custom.adkcon = AC_UARTBRK;
+        mb();
+        local_irq_restore(flags);
+        return 0;
+}
+
+/*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ *     RI where only 0->1 is counted.
+ */
+static int rs_get_icount(struct tty_struct *tty,
+                                struct serial_icounter_struct *icount)
+{
+        struct async_struct *info = tty->driver_data;
+        struct async_icount cnow;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        cnow = info->state->icount;
+        local_irq_restore(flags);
+        icount->cts = cnow.cts;
+        icount->dsr = cnow.dsr;
+        icount->rng = cnow.rng;
+        icount->dcd = cnow.dcd;
+        icount->rx = cnow.rx;
+        icount->tx = cnow.tx;
+        icount->frame = cnow.frame;
+        icount->overrun = cnow.overrun;
+        icount->parity = cnow.parity;
+        icount->brk = cnow.brk;
+        icount->buf_overrun = cnow.buf_overrun;
+
+        return 0;
+}
+
+static int rs_ioctl(struct tty_struct *tty,
+                    unsigned int cmd, unsigned long arg)
+{
+        struct async_struct * info = tty->driver_data;
+        struct async_icount cprev, cnow;        /* kernel counter temps */
+        void __user *argp = (void __user *)arg;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+                return -ENODEV;
+
+        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
+            (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
+                if (tty->flags & (1 << TTY_IO_ERROR))
+                    return -EIO;
+        }
+
+        switch (cmd) {
+                case TIOCGSERIAL:
+                        return get_serial_info(info, argp);
+                case TIOCSSERIAL:
+                        return set_serial_info(info, argp);
+                case TIOCSERCONFIG:
+                        return 0;
+
+                case TIOCSERGETLSR: /* Get line status register */
+                        return get_lsr_info(info, argp);
+
+                case TIOCSERGSTRUCT:
+                        if (copy_to_user(argp,
+                                         info, sizeof(struct async_struct)))
+                                return -EFAULT;
+                        return 0;
+
+                /*
+                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+                 * - mask passed in arg for lines of interest
+                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+                 * Caller should use TIOCGICOUNT to see which one it was
+                 */
+                case TIOCMIWAIT:
+                        local_irq_save(flags);
+                        /* note the counters on entry */
+                        cprev = info->state->icount;
+                        local_irq_restore(flags);
+                        while (1) {
+                                interruptible_sleep_on(&info->delta_msr_wait);
+                                /* see if a signal did it */
+                                if (signal_pending(current))
+                                        return -ERESTARTSYS;
+                                local_irq_save(flags);
+                                cnow = info->state->icount; /* atomic copy */
+                                local_irq_restore(flags);
+                                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
+                                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
+                                        return -EIO; /* no change => error */
+                                if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
+                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
+                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
+                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
+                                        return 0;
+                                }
+                                cprev = cnow;
+                        }
+                        /* NOTREACHED */
+
+                case TIOCSERGWILD:
+                case TIOCSERSWILD:
+                        /* "setserial -W" is called in Debian boot */
+                        printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
+                        return 0;
+
+                default:
+                        return -ENOIOCTLCMD;
+                }
+        return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        struct async_struct *info = tty->driver_data;
+        unsigned long flags;
+        unsigned int cflag = tty->termios->c_cflag;
+
+        change_speed(info, old_termios);
+
+        /* Handle transition to B0 status */
+        if ((old_termios->c_cflag & CBAUD) &&
+            !(cflag & CBAUD)) {
+                info->MCR &= ~(SER_DTR|SER_RTS);
+                local_irq_save(flags);
+                rtsdtr_ctrl(info->MCR);
+                local_irq_restore(flags);
+        }
+
+        /* Handle transition away from B0 status */
+        if (!(old_termios->c_cflag & CBAUD) &&
+            (cflag & CBAUD)) {
+                info->MCR |= SER_DTR;
+                if (!(tty->termios->c_cflag & CRTSCTS) || 
+                    !test_bit(TTY_THROTTLED, &tty->flags)) {
+                        info->MCR |= SER_RTS;
+                }
+                local_irq_save(flags);
+                rtsdtr_ctrl(info->MCR);
+                local_irq_restore(flags);
+        }
+
+        /* Handle turning off CRTSCTS */
+        if ((old_termios->c_cflag & CRTSCTS) &&
+            !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                rs_start(tty);
+        }
+
+#if 0
+        /*
+         * No need to wake up processes in open wait, since they
+         * sample the CLOCAL flag once, and don't recheck it.
+         * XXX  It's not clear whether the current behavior is correct
+         * or not.  Hence, this may change.....
+         */
+        if (!(old_termios->c_cflag & CLOCAL) &&
+            (tty->termios->c_cflag & CLOCAL))
+                wake_up_interruptible(&info->open_wait);
+#endif
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ * 
+ * This routine is called when the serial port gets closed.  First, we
+ * wait for the last remaining data to be sent.  Then, we unlink its
+ * async structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+        struct async_struct * info = tty->driver_data;
+        struct serial_state *state;
+        unsigned long flags;
+
+        if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
+                return;
+
+        state = info->state;
+
+        local_irq_save(flags);
+
+        if (tty_hung_up_p(filp)) {
+                DBG_CNT("before DEC-hung");
+                local_irq_restore(flags);
+                return;
+        }
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("rs_close ttys%d, count = %d\n", info->line, state->count);
+#endif
+        if ((tty->count == 1) && (state->count != 1)) {
+                /*
+                 * Uh, oh.  tty->count is 1, which means that the tty
+                 * structure will be freed.  state->count should always
+                 * be one in these conditions.  If it's greater than
+                 * one, we've got real problems, since it means the
+                 * serial port won't be shutdown.
+                 */
+                printk("rs_close: bad serial port count; tty->count is 1, "
+                       "state->count is %d\n", state->count);
+                state->count = 1;
+        }
+        if (--state->count < 0) {
+                printk("rs_close: bad serial port count for ttys%d: %d\n",
+                       info->line, state->count);
+                state->count = 0;
+        }
+        if (state->count) {
+                DBG_CNT("before DEC-2");
+                local_irq_restore(flags);
+                return;
+        }
+        info->flags |= ASYNC_CLOSING;
+        /*
+         * Now we wait for the transmit buffer to clear; and we notify 
+         * the line discipline to only process XON/XOFF characters.
+         */
+        tty->closing = 1;
+        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+                tty_wait_until_sent(tty, info->closing_wait);
+        /*
+         * At this point we stop accepting input.  To do this, we
+         * disable the receive line status interrupts, and tell the
+         * interrupt driver to stop checking the data ready bit in the
+         * line status register.
+         */
+        info->read_status_mask &= ~UART_LSR_DR;
+        if (info->flags & ASYNC_INITIALIZED) {
+                /* disable receive interrupts */
+                custom.intena = IF_RBF;
+                mb();
+                /* clear any pending receive interrupt */
+                custom.intreq = IF_RBF;
+                mb();
+
+                /*
+                 * Before we drop DTR, make sure the UART transmitter
+                 * has completely drained; this is especially
+                 * important if there is a transmit FIFO!
+                 */
+                rs_wait_until_sent(tty, info->timeout);
+        }
+        shutdown(info);
+        rs_flush_buffer(tty);
+                
+        tty_ldisc_flush(tty);
+        tty->closing = 0;
+        info->event = 0;
+        info->tty = NULL;
+        if (info->blocked_open) {
+                if (info->close_delay) {
+                        msleep_interruptible(jiffies_to_msecs(info->close_delay));
+                }
+                wake_up_interruptible(&info->open_wait);
+        }
+        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+        wake_up_interruptible(&info->close_wait);
+        local_irq_restore(flags);
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        struct async_struct * info = tty->driver_data;
+        unsigned long orig_jiffies, char_time;
+        int tty_was_locked = tty_locked();
+        int lsr;
+
+        if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
+                return;
+
+        if (info->xmit_fifo_size == 0)
+                return; /* Just in case.... */
+
+        orig_jiffies = jiffies;
+
+        /*
+         * tty_wait_until_sent is called from lots of places,
+         * with or without the BTM.
+         */
+        if (!tty_was_locked)
+                tty_lock();
+        /*
+         * Set the check interval to be 1/5 of the estimated time to
+         * send a single character, and make it at least 1.  The check
+         * interval should also be less than the timeout.
+         * 
+         * Note: we have to use pretty tight timings here to satisfy
+         * the NIST-PCTS.
+         */
+        char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
+        char_time = char_time / 5;
+        if (char_time == 0)
+                char_time = 1;
+        if (timeout)
+          char_time = min_t(unsigned long, char_time, timeout);
+        /*
+         * If the transmitter hasn't cleared in twice the approximate
+         * amount of time to send the entire FIFO, it probably won't
+         * ever clear.  This assumes the UART isn't doing flow
+         * control, which is currently the case.  Hence, if it ever
+         * takes longer than info->timeout, this is probably due to a
+         * UART bug of some kind.  So, we clamp the timeout parameter at
+         * 2*info->timeout.
+         */
+        if (!timeout || timeout > 2*info->timeout)
+                timeout = 2*info->timeout;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+        printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
+        printk("jiff=%lu...", jiffies);
+#endif
+        while(!((lsr = custom.serdatr) & SDR_TSRE)) {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+                printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
+#endif
+                msleep_interruptible(jiffies_to_msecs(char_time));
+                if (signal_pending(current))
+                        break;
+                if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                        break;
+        }
+        __set_current_state(TASK_RUNNING);
+        if (!tty_was_locked)
+                tty_unlock();
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+        printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
+#endif
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void rs_hangup(struct tty_struct *tty)
+{
+        struct async_struct * info = tty->driver_data;
+        struct serial_state *state = info->state;
+
+        if (serial_paranoia_check(info, tty->name, "rs_hangup"))
+                return;
+
+        state = info->state;
+
+        rs_flush_buffer(tty);
+        shutdown(info);
+        info->event = 0;
+        state->count = 0;
+        info->flags &= ~ASYNC_NORMAL_ACTIVE;
+        info->tty = NULL;
+        wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+                           struct async_struct *info)
+{
+#ifdef DECLARE_WAITQUEUE
+        DECLARE_WAITQUEUE(wait, current);
+#else
+        struct wait_queue wait = { current, NULL };
+#endif
+        struct serial_state *state = info->state;
+        int             retval;
+        int             do_clocal = 0, extra_count = 0;
+        unsigned long   flags;
+
+        /*
+         * If the device is in the middle of being closed, then block
+         * until it's done, and then try again.
+         */
+        if (tty_hung_up_p(filp) ||
+            (info->flags & ASYNC_CLOSING)) {
+                if (info->flags & ASYNC_CLOSING)
+                        interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+                return ((info->flags & ASYNC_HUP_NOTIFY) ?
+                        -EAGAIN : -ERESTARTSYS);
+#else
+                return -EAGAIN;
+#endif
+        }
+
+        /*
+         * If non-blocking mode is set, or the port is not enabled,
+         * then make the check up front and then exit.
+         */
+        if ((filp->f_flags & O_NONBLOCK) ||
+            (tty->flags & (1 << TTY_IO_ERROR))) {
+                info->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (tty->termios->c_cflag & CLOCAL)
+                do_clocal = 1;
+
+        /*
+         * Block waiting for the carrier detect and the line to become
+         * free (i.e., not in use by the callout).  While we are in
+         * this loop, state->count is dropped by one, so that
+         * rs_close() knows when to free things.  We restore it upon
+         * exit, either normal or abnormal.
+         */
+        retval = 0;
+        add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+        printk("block_til_ready before block: ttys%d, count = %d\n",
+               state->line, state->count);
+#endif
+        local_irq_save(flags);
+        if (!tty_hung_up_p(filp)) {
+                extra_count = 1;
+                state->count--;
+        }
+        local_irq_restore(flags);
+        info->blocked_open++;
+        while (1) {
+                local_irq_save(flags);
+                if (tty->termios->c_cflag & CBAUD)
+                        rtsdtr_ctrl(SER_DTR|SER_RTS);
+                local_irq_restore(flags);
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (tty_hung_up_p(filp) ||
+                    !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+                        if (info->flags & ASYNC_HUP_NOTIFY)
+                                retval = -EAGAIN;
+                        else
+                                retval = -ERESTARTSYS;
+#else
+                        retval = -EAGAIN;
+#endif
+                        break;
+                }
+                if (!(info->flags & ASYNC_CLOSING) &&
+                    (do_clocal || (!(ciab.pra & SER_DCD)) ))
+                        break;
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+#ifdef SERIAL_DEBUG_OPEN
+                printk("block_til_ready blocking: ttys%d, count = %d\n",
+                       info->line, state->count);
+#endif
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(&info->open_wait, &wait);
+        if (extra_count)
+                state->count++;
+        info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+        printk("block_til_ready after blocking: ttys%d, count = %d\n",
+               info->line, state->count);
+#endif
+        if (retval)
+                return retval;
+        info->flags |= ASYNC_NORMAL_ACTIVE;
+        return 0;
+}
+
+static int get_async_struct(int line, struct async_struct **ret_info)
+{
+        struct async_struct *info;
+        struct serial_state *sstate;
+
+        sstate = rs_table + line;
+        sstate->count++;
+        if (sstate->info) {
+                *ret_info = sstate->info;
+                return 0;
+        }
+        info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
+        if (!info) {
+                sstate->count--;
+                return -ENOMEM;
+        }
+#ifdef DECLARE_WAITQUEUE
+        init_waitqueue_head(&info->open_wait);
+        init_waitqueue_head(&info->close_wait);
+        init_waitqueue_head(&info->delta_msr_wait);
+#endif
+        info->magic = SERIAL_MAGIC;
+        info->port = sstate->port;
+        info->flags = sstate->flags;
+        info->xmit_fifo_size = sstate->xmit_fifo_size;
+        info->line = line;
+        tasklet_init(&info->tlet, do_softint, (unsigned long)info);
+        info->state = sstate;
+        if (sstate->info) {
+                kfree(info);
+                *ret_info = sstate->info;
+                return 0;
+        }
+        *ret_info = sstate->info = info;
+        return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain.   It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int rs_open(struct tty_struct *tty, struct file * filp)
+{
+        struct async_struct     *info;
+        int                     retval, line;
+
+        line = tty->index;
+        if ((line < 0) || (line >= NR_PORTS)) {
+                return -ENODEV;
+        }
+        retval = get_async_struct(line, &info);
+        if (retval) {
+                return retval;
+        }
+        tty->driver_data = info;
+        info->tty = tty;
+        if (serial_paranoia_check(info, tty->name, "rs_open"))
+                return -ENODEV;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("rs_open %s, count = %d\n", tty->name, info->state->count);
+#endif
+        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+        /*
+         * If the port is the middle of closing, bail out now
+         */
+        if (tty_hung_up_p(filp) ||
+            (info->flags & ASYNC_CLOSING)) {
+                if (info->flags & ASYNC_CLOSING)
+                        interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+                return ((info->flags & ASYNC_HUP_NOTIFY) ?
+                        -EAGAIN : -ERESTARTSYS);
+#else
+                return -EAGAIN;
+#endif
+        }
+
+        /*
+         * Start up serial port
+         */
+        retval = startup(info);
+        if (retval) {
+                return retval;
+        }
+
+        retval = block_til_ready(tty, filp, info);
+        if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+                printk("rs_open returning after block_til_ready with %d\n",
+                       retval);
+#endif
+                return retval;
+        }
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("rs_open %s successful...", tty->name);
+#endif
+        return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline void line_info(struct seq_file *m, struct serial_state *state)
+{
+        struct async_struct *info = state->info, scr_info;
+        char    stat_buf[30], control, status;
+        unsigned long flags;
+
+        seq_printf(m, "%d: uart:amiga_builtin",state->line);
+
+        /*
+         * Figure out the current RS-232 lines
+         */
+        if (!info) {
+                info = &scr_info;       /* This is just for serial_{in,out} */
+
+                info->magic = SERIAL_MAGIC;
+                info->flags = state->flags;
+                info->quot = 0;
+                info->tty = NULL;
+        }
+        local_irq_save(flags);
+        status = ciab.pra;
+        control = info ? info->MCR : status;
+        local_irq_restore(flags);
+
+        stat_buf[0] = 0;
+        stat_buf[1] = 0;
+        if(!(control & SER_RTS))
+                strcat(stat_buf, "|RTS");
+        if(!(status & SER_CTS))
+                strcat(stat_buf, "|CTS");
+        if(!(control & SER_DTR))
+                strcat(stat_buf, "|DTR");
+        if(!(status & SER_DSR))
+                strcat(stat_buf, "|DSR");
+        if(!(status & SER_DCD))
+                strcat(stat_buf, "|CD");
+
+        if (info->quot) {
+                seq_printf(m, " baud:%d", state->baud_base / info->quot);
+        }
+
+        seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
+
+        if (state->icount.frame)
+                seq_printf(m, " fe:%d", state->icount.frame);
+
+        if (state->icount.parity)
+                seq_printf(m, " pe:%d", state->icount.parity);
+
+        if (state->icount.brk)
+                seq_printf(m, " brk:%d", state->icount.brk);
+
+        if (state->icount.overrun)
+                seq_printf(m, " oe:%d", state->icount.overrun);
+
+        /*
+         * Last thing is the RS-232 status lines
+         */
+        seq_printf(m, " %s\n", stat_buf+1);
+}
+
+static int rs_proc_show(struct seq_file *m, void *v)
+{
+        seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
+        line_info(m, &rs_table[0]);
+        return 0;
+}
+
+static int rs_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, rs_proc_show, NULL);
+}
+
+static const struct file_operations rs_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = rs_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/*
+ * ---------------------------------------------------------------------
+ * rs_init() and friends
+ *
+ * rs_init() is called at boot-time to initialize the serial driver.
+ * ---------------------------------------------------------------------
+ */
+
+/*
+ * This routine prints out the appropriate serial driver version
+ * number, and identifies which options were configured into this
+ * driver.
+ */
+static void show_serial_version(void)
+{
+        printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
+}
+
+
+static const struct tty_operations serial_ops = {
+        .open = rs_open,
+        .close = rs_close,
+        .write = rs_write,
+        .put_char = rs_put_char,
+        .flush_chars = rs_flush_chars,
+        .write_room = rs_write_room,
+        .chars_in_buffer = rs_chars_in_buffer,
+        .flush_buffer = rs_flush_buffer,
+        .ioctl = rs_ioctl,
+        .throttle = rs_throttle,
+        .unthrottle = rs_unthrottle,
+        .set_termios = rs_set_termios,
+        .stop = rs_stop,
+        .start = rs_start,
+        .hangup = rs_hangup,
+        .break_ctl = rs_break,
+        .send_xchar = rs_send_xchar,
+        .wait_until_sent = rs_wait_until_sent,
+        .tiocmget = rs_tiocmget,
+        .tiocmset = rs_tiocmset,
+        .get_icount = rs_get_icount,
+        .proc_fops = &rs_proc_fops,
+};
+
+/*
+ * The serial driver boot-time initialization code!
+ */
+static int __init amiga_serial_probe(struct platform_device *pdev)
+{
+        unsigned long flags;
+        struct serial_state * state;
+        int error;
+
+        serial_driver = alloc_tty_driver(1);
+        if (!serial_driver)
+                return -ENOMEM;
+
+        IRQ_ports = NULL;
+
+        show_serial_version();
+
+        /* Initialize the tty_driver structure */
+
+        serial_driver->owner = THIS_MODULE;
+        serial_driver->driver_name = "amiserial";
+        serial_driver->name = "ttyS";
+        serial_driver->major = TTY_MAJOR;
+        serial_driver->minor_start = 64;
+        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        serial_driver->subtype = SERIAL_TYPE_NORMAL;
+        serial_driver->init_termios = tty_std_termios;
+        serial_driver->init_termios.c_cflag =
+                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        serial_driver->flags = TTY_DRIVER_REAL_RAW;
+        tty_set_operations(serial_driver, &serial_ops);
+
+        error = tty_register_driver(serial_driver);
+        if (error)
+                goto fail_put_tty_driver;
+
+        state = rs_table;
+        state->magic = SSTATE_MAGIC;
+        state->port = (int)&custom.serdatr; /* Just to give it a value */
+        state->line = 0;
+        state->custom_divisor = 0;
+        state->close_delay = 5*HZ/10;
+        state->closing_wait = 30*HZ;
+        state->icount.cts = state->icount.dsr = 
+          state->icount.rng = state->icount.dcd = 0;
+        state->icount.rx = state->icount.tx = 0;
+        state->icount.frame = state->icount.parity = 0;
+        state->icount.overrun = state->icount.brk = 0;
+
+        printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
+                       state->line);
+
+        /* Hardware set up */
+
+        state->baud_base = amiga_colorclock;
+        state->xmit_fifo_size = 1;
+
+        /* set ISRs, and then disable the rx interrupts */
+        error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
+        if (error)
+                goto fail_unregister;
+
+        error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
+                            "serial RX", state);
+        if (error)
+                goto fail_free_irq;
+
+        local_irq_save(flags);
+
+        /* turn off Rx and Tx interrupts */
+        custom.intena = IF_RBF | IF_TBE;
+        mb();
+
+        /* clear any pending interrupt */
+        custom.intreq = IF_RBF | IF_TBE;
+        mb();
+
+        local_irq_restore(flags);
+
+        /*
+         * set the appropriate directions for the modem control flags,
+         * and clear RTS and DTR
+         */
+        ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
+        ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
+
+        platform_set_drvdata(pdev, state);
+
+        return 0;
+
+fail_free_irq:
+        free_irq(IRQ_AMIGA_TBE, state);
+fail_unregister:
+        tty_unregister_driver(serial_driver);
+fail_put_tty_driver:
+        put_tty_driver(serial_driver);
+        return error;
+}
+
+static int __exit amiga_serial_remove(struct platform_device *pdev)
+{
+        int error;
+        struct serial_state *state = platform_get_drvdata(pdev);
+        struct async_struct *info = state->info;
+
+        /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
+        tasklet_kill(&info->tlet);
+        if ((error = tty_unregister_driver(serial_driver)))
+                printk("SERIAL: failed to unregister serial driver (%d)\n",
+                       error);
+        put_tty_driver(serial_driver);
+
+        rs_table[0].info = NULL;
+        kfree(info);
+
+        free_irq(IRQ_AMIGA_TBE, rs_table);
+        free_irq(IRQ_AMIGA_RBF, rs_table);
+
+        platform_set_drvdata(pdev, NULL);
+
+        return error;
+}
+
+static struct platform_driver amiga_serial_driver = {
+        .remove = __exit_p(amiga_serial_remove),
+        .driver   = {
+                .name   = "amiga-serial",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init amiga_serial_init(void)
+{
+        return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
+}
+
+module_init(amiga_serial_init);
+
+static void __exit amiga_serial_exit(void)
+{
+        platform_driver_unregister(&amiga_serial_driver);
+}
+
+module_exit(amiga_serial_exit);
+
+
+#if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
+
+/*
+ * ------------------------------------------------------------
+ * Serial console driver
+ * ------------------------------------------------------------
+ */
+
+static void amiga_serial_putc(char c)
+{
+        custom.serdat = (unsigned char)c | 0x100;
+        while (!(custom.serdatr & 0x2000))
+                barrier();
+}
+
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ *
+ *      The console must be locked when we get here.
+ */
+static void serial_console_write(struct console *co, const char *s,
+                                unsigned count)
+{
+        unsigned short intena = custom.intenar;
+
+        custom.intena = IF_TBE;
+
+        while (count--) {
+                if (*s == '\n')
+                        amiga_serial_putc('\r');
+                amiga_serial_putc(*s++);
+        }
+
+        custom.intena = IF_SETCLR | (intena & IF_TBE);
+}
+
+static struct tty_driver *serial_console_device(struct console *c, int *index)
+{
+        *index = 0;
+        return serial_driver;
+}
+
+static struct console sercons = {
+        .name =         "ttyS",
+        .write =        serial_console_write,
+        .device =       serial_console_device,
+        .flags =        CON_PRINTBUFFER,
+        .index =        -1,
+};
+
+/*
+ *      Register console.
+ */
+static int __init amiserial_console_init(void)
+{
+        register_console(&sercons);
+        return 0;
+}
+console_initcall(amiserial_console_init);
+
+#endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:amiga-serial");
diff --git a/drivers/tty/bfin_jtag_comm.c b/drivers/tty/bfin_jtag_comm.c
new file mode 100644
index 000000000000..03c285bb2f18
--- /dev/null
+++ b/drivers/tty/bfin_jtag_comm.c
@@ -0,0 +1,368 @@
+/*
+ * TTY over Blackfin JTAG Communication
+ *
+ * Copyright 2008-2009 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#define DRV_NAME "bfin-jtag-comm"
+#define DEV_NAME "ttyBFJC"
+#define pr_fmt(fmt) DRV_NAME ": " fmt
+
+#include <linux/circ_buf.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <asm/atomic.h>
+
+#define pr_init(fmt, args...) ({ static const __initconst char __fmt[] = fmt; printk(__fmt, ## args); })
+
+/* See the Debug/Emulation chapter in the HRM */
+#define EMUDOF   0x00000001     /* EMUDAT_OUT full & valid */
+#define EMUDIF   0x00000002     /* EMUDAT_IN full & valid */
+#define EMUDOOVF 0x00000004     /* EMUDAT_OUT overflow */
+#define EMUDIOVF 0x00000008     /* EMUDAT_IN overflow */
+
+static inline uint32_t bfin_write_emudat(uint32_t emudat)
+{
+        __asm__ __volatile__("emudat = %0;" : : "d"(emudat));
+        return emudat;
+}
+
+static inline uint32_t bfin_read_emudat(void)
+{
+        uint32_t emudat;
+        __asm__ __volatile__("%0 = emudat;" : "=d"(emudat));
+        return emudat;
+}
+
+static inline uint32_t bfin_write_emudat_chars(char a, char b, char c, char d)
+{
+        return bfin_write_emudat((a << 0) | (b << 8) | (c << 16) | (d << 24));
+}
+
+#define CIRC_SIZE 2048  /* see comment in tty_io.c:do_tty_write() */
+#define CIRC_MASK (CIRC_SIZE - 1)
+#define circ_empty(circ)     ((circ)->head == (circ)->tail)
+#define circ_free(circ)      CIRC_SPACE((circ)->head, (circ)->tail, CIRC_SIZE)
+#define circ_cnt(circ)       CIRC_CNT((circ)->head, (circ)->tail, CIRC_SIZE)
+#define circ_byte(circ, idx) ((circ)->buf[(idx) & CIRC_MASK])
+
+static struct tty_driver *bfin_jc_driver;
+static struct task_struct *bfin_jc_kthread;
+static struct tty_struct * volatile bfin_jc_tty;
+static unsigned long bfin_jc_count;
+static DEFINE_MUTEX(bfin_jc_tty_mutex);
+static volatile struct circ_buf bfin_jc_write_buf;
+
+static int
+bfin_jc_emudat_manager(void *arg)
+{
+        uint32_t inbound_len = 0, outbound_len = 0;
+
+        while (!kthread_should_stop()) {
+                /* no one left to give data to, so sleep */
+                if (bfin_jc_tty == NULL && circ_empty(&bfin_jc_write_buf)) {
+                        pr_debug("waiting for readers\n");
+                        __set_current_state(TASK_UNINTERRUPTIBLE);
+                        schedule();
+                        __set_current_state(TASK_RUNNING);
+                }
+
+                /* no data available, so just chill */
+                if (!(bfin_read_DBGSTAT() & EMUDIF) && circ_empty(&bfin_jc_write_buf)) {
+                        pr_debug("waiting for data (in_len = %i) (circ: %i %i)\n",
+                                inbound_len, bfin_jc_write_buf.tail, bfin_jc_write_buf.head);
+                        if (inbound_len)
+                                schedule();
+                        else
+                                schedule_timeout_interruptible(HZ);
+                        continue;
+                }
+
+                /* if incoming data is ready, eat it */
+                if (bfin_read_DBGSTAT() & EMUDIF) {
+                        struct tty_struct *tty;
+                        mutex_lock(&bfin_jc_tty_mutex);
+                        tty = (struct tty_struct *)bfin_jc_tty;
+                        if (tty != NULL) {
+                                uint32_t emudat = bfin_read_emudat();
+                                if (inbound_len == 0) {
+                                        pr_debug("incoming length: 0x%08x\n", emudat);
+                                        inbound_len = emudat;
+                                } else {
+                                        size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
+                                        pr_debug("  incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
+                                        inbound_len -= num_chars;
+                                        tty_insert_flip_string(tty, (unsigned char *)&emudat, num_chars);
+                                        tty_flip_buffer_push(tty);
+                                }
+                        }
+                        mutex_unlock(&bfin_jc_tty_mutex);
+                }
+
+                /* if outgoing data is ready, post it */
+                if (!(bfin_read_DBGSTAT() & EMUDOF) && !circ_empty(&bfin_jc_write_buf)) {
+                        if (outbound_len == 0) {
+                                outbound_len = circ_cnt(&bfin_jc_write_buf);
+                                bfin_write_emudat(outbound_len);
+                                pr_debug("outgoing length: 0x%08x\n", outbound_len);
+                        } else {
+                                struct tty_struct *tty;
+                                int tail = bfin_jc_write_buf.tail;
+                                size_t ate = (4 <= outbound_len ? 4 : outbound_len);
+                                uint32_t emudat =
+                                bfin_write_emudat_chars(
+                                        circ_byte(&bfin_jc_write_buf, tail + 0),
+                                        circ_byte(&bfin_jc_write_buf, tail + 1),
+                                        circ_byte(&bfin_jc_write_buf, tail + 2),
+                                        circ_byte(&bfin_jc_write_buf, tail + 3)
+                                );
+                                bfin_jc_write_buf.tail += ate;
+                                outbound_len -= ate;
+                                mutex_lock(&bfin_jc_tty_mutex);
+                                tty = (struct tty_struct *)bfin_jc_tty;
+                                if (tty)
+                                        tty_wakeup(tty);
+                                mutex_unlock(&bfin_jc_tty_mutex);
+                                pr_debug("  outgoing data: 0x%08x (pushing %zu)\n", emudat, ate);
+                        }
+                }
+        }
+
+        __set_current_state(TASK_RUNNING);
+        return 0;
+}
+
+static int
+bfin_jc_open(struct tty_struct *tty, struct file *filp)
+{
+        mutex_lock(&bfin_jc_tty_mutex);
+        pr_debug("open %lu\n", bfin_jc_count);
+        ++bfin_jc_count;
+        bfin_jc_tty = tty;
+        wake_up_process(bfin_jc_kthread);
+        mutex_unlock(&bfin_jc_tty_mutex);
+        return 0;
+}
+
+static void
+bfin_jc_close(struct tty_struct *tty, struct file *filp)
+{
+        mutex_lock(&bfin_jc_tty_mutex);
+        pr_debug("close %lu\n", bfin_jc_count);
+        if (--bfin_jc_count == 0)
+                bfin_jc_tty = NULL;
+        wake_up_process(bfin_jc_kthread);
+        mutex_unlock(&bfin_jc_tty_mutex);
+}
+
+/* XXX: we dont handle the put_char() case where we must handle count = 1 */
+static int
+bfin_jc_circ_write(const unsigned char *buf, int count)
+{
+        int i;
+        count = min(count, circ_free(&bfin_jc_write_buf));
+        pr_debug("going to write chunk of %i bytes\n", count);
+        for (i = 0; i < count; ++i)
+                circ_byte(&bfin_jc_write_buf, bfin_jc_write_buf.head + i) = buf[i];
+        bfin_jc_write_buf.head += i;
+        return i;
+}
+
+#ifndef CONFIG_BFIN_JTAG_COMM_CONSOLE
+# define console_lock()
+# define console_unlock()
+#endif
+static int
+bfin_jc_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+        int i;
+        console_lock();
+        i = bfin_jc_circ_write(buf, count);
+        console_unlock();
+        wake_up_process(bfin_jc_kthread);
+        return i;
+}
+
+static void
+bfin_jc_flush_chars(struct tty_struct *tty)
+{
+        wake_up_process(bfin_jc_kthread);
+}
+
+static int
+bfin_jc_write_room(struct tty_struct *tty)
+{
+        return circ_free(&bfin_jc_write_buf);
+}
+
+static int
+bfin_jc_chars_in_buffer(struct tty_struct *tty)
+{
+        return circ_cnt(&bfin_jc_write_buf);
+}
+
+static void
+bfin_jc_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        unsigned long expire = jiffies + timeout;
+        while (!circ_empty(&bfin_jc_write_buf)) {
+                if (signal_pending(current))
+                        break;
+                if (time_after(jiffies, expire))
+                        break;
+        }
+}
+
+static const struct tty_operations bfin_jc_ops = {
+        .open            = bfin_jc_open,
+        .close           = bfin_jc_close,
+        .write           = bfin_jc_write,
+        /*.put_char        = bfin_jc_put_char,*/
+        .flush_chars     = bfin_jc_flush_chars,
+        .write_room      = bfin_jc_write_room,
+        .chars_in_buffer = bfin_jc_chars_in_buffer,
+        .wait_until_sent = bfin_jc_wait_until_sent,
+};
+
+static int __init bfin_jc_init(void)
+{
+        int ret;
+
+        bfin_jc_kthread = kthread_create(bfin_jc_emudat_manager, NULL, DRV_NAME);
+        if (IS_ERR(bfin_jc_kthread))
+                return PTR_ERR(bfin_jc_kthread);
+
+        ret = -ENOMEM;
+
+        bfin_jc_write_buf.head = bfin_jc_write_buf.tail = 0;
+        bfin_jc_write_buf.buf = kmalloc(CIRC_SIZE, GFP_KERNEL);
+        if (!bfin_jc_write_buf.buf)
+                goto err_buf;
+
+        bfin_jc_driver = alloc_tty_driver(1);
+        if (!bfin_jc_driver)
+                goto err_driver;
+
+        bfin_jc_driver->owner        = THIS_MODULE;
+        bfin_jc_driver->driver_name  = DRV_NAME;
+        bfin_jc_driver->name         = DEV_NAME;
+        bfin_jc_driver->type         = TTY_DRIVER_TYPE_SERIAL;
+        bfin_jc_driver->subtype      = SERIAL_TYPE_NORMAL;
+        bfin_jc_driver->init_termios = tty_std_termios;
+        tty_set_operations(bfin_jc_driver, &bfin_jc_ops);
+
+        ret = tty_register_driver(bfin_jc_driver);
+        if (ret)
+                goto err;
+
+        pr_init(KERN_INFO DRV_NAME ": initialized\n");
+
+        return 0;
+
+ err:
+        put_tty_driver(bfin_jc_driver);
+ err_driver:
+        kfree(bfin_jc_write_buf.buf);
+ err_buf:
+        kthread_stop(bfin_jc_kthread);
+        return ret;
+}
+module_init(bfin_jc_init);
+
+static void __exit bfin_jc_exit(void)
+{
+        kthread_stop(bfin_jc_kthread);
+        kfree(bfin_jc_write_buf.buf);
+        tty_unregister_driver(bfin_jc_driver);
+        put_tty_driver(bfin_jc_driver);
+}
+module_exit(bfin_jc_exit);
+
+#if defined(CONFIG_BFIN_JTAG_COMM_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
+static void
+bfin_jc_straight_buffer_write(const char *buf, unsigned count)
+{
+        unsigned ate = 0;
+        while (bfin_read_DBGSTAT() & EMUDOF)
+                continue;
+        bfin_write_emudat(count);
+        while (ate < count) {
+                while (bfin_read_DBGSTAT() & EMUDOF)
+                        continue;
+                bfin_write_emudat_chars(buf[ate], buf[ate+1], buf[ate+2], buf[ate+3]);
+                ate += 4;
+        }
+}
+#endif
+
+#ifdef CONFIG_BFIN_JTAG_COMM_CONSOLE
+static void
+bfin_jc_console_write(struct console *co, const char *buf, unsigned count)
+{
+        if (bfin_jc_kthread == NULL)
+                bfin_jc_straight_buffer_write(buf, count);
+        else
+                bfin_jc_circ_write(buf, count);
+}
+
+static struct tty_driver *
+bfin_jc_console_device(struct console *co, int *index)
+{
+        *index = co->index;
+        return bfin_jc_driver;
+}
+
+static struct console bfin_jc_console = {
+        .name    = DEV_NAME,
+        .write   = bfin_jc_console_write,
+        .device  = bfin_jc_console_device,
+        .flags   = CON_ANYTIME | CON_PRINTBUFFER,
+        .index   = -1,
+};
+
+static int __init bfin_jc_console_init(void)
+{
+        register_console(&bfin_jc_console);
+        return 0;
+}
+console_initcall(bfin_jc_console_init);
+#endif
+
+#ifdef CONFIG_EARLY_PRINTK
+static void __init
+bfin_jc_early_write(struct console *co, const char *buf, unsigned int count)
+{
+        bfin_jc_straight_buffer_write(buf, count);
+}
+
+static struct __initdata console bfin_jc_early_console = {
+        .name   = "early_BFJC",
+        .write   = bfin_jc_early_write,
+        .flags   = CON_ANYTIME | CON_PRINTBUFFER,
+        .index   = -1,
+};
+
+struct console * __init
+bfin_jc_early_init(unsigned int port, unsigned int cflag)
+{
+        return &bfin_jc_early_console;
+}
+#endif
+
+MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>");
+MODULE_DESCRIPTION("TTY over Blackfin JTAG Communication");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c
new file mode 100644
index 000000000000..c0e8f2eeb886
--- /dev/null
+++ b/drivers/tty/cyclades.c
@@ -0,0 +1,4196 @@
+#undef  BLOCKMOVE
+#define Z_WAKE
+#undef  Z_EXT_CHARS_IN_BUFFER
+
+/*
+ * This file contains the driver for the Cyclades async multiport
+ * serial boards.
+ *
+ * Initially written by Randolph Bentson <bentson@grieg.seaslug.org>.
+ * Modified and maintained by Marcio Saito <marcio@cyclades.com>.
+ *
+ * Copyright (C) 2007-2009 Jiri Slaby <jirislaby@gmail.com>
+ *
+ * Much of the design and some of the code came from serial.c
+ * which was copyright (C) 1991, 1992  Linus Torvalds.  It was
+ * extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
+ * and then fixed as suggested by Michael K. Johnson 12/12/92.
+ * Converted to pci probing and cleaned up by Jiri Slaby.
+ *
+ */
+
+#define CY_VERSION      "2.6"
+
+/* If you need to install more boards than NR_CARDS, change the constant
+   in the definition below. No other change is necessary to support up to
+   eight boards. Beyond that you'll have to extend cy_isa_addresses. */
+
+#define NR_CARDS        4
+
+/*
+   If the total number of ports is larger than NR_PORTS, change this
+   constant in the definition below. No other change is necessary to
+   support more boards/ports. */
+
+#define NR_PORTS        256
+
+#define ZO_V1   0
+#define ZO_V2   1
+#define ZE_V1   2
+
+#define SERIAL_PARANOIA_CHECK
+#undef  CY_DEBUG_OPEN
+#undef  CY_DEBUG_THROTTLE
+#undef  CY_DEBUG_OTHER
+#undef  CY_DEBUG_IO
+#undef  CY_DEBUG_COUNT
+#undef  CY_DEBUG_DTR
+#undef  CY_DEBUG_WAIT_UNTIL_SENT
+#undef  CY_DEBUG_INTERRUPTS
+#undef  CY_16Y_HACK
+#undef  CY_ENABLE_MONITORING
+#undef  CY_PCI_DEBUG
+
+/*
+ * Include section
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/cyclades.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/bitops.h>
+#include <linux/firmware.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+static void cy_send_xchar(struct tty_struct *tty, char ch);
+
+#ifndef SERIAL_XMIT_SIZE
+#define SERIAL_XMIT_SIZE        (min(PAGE_SIZE, 4096))
+#endif
+
+#define STD_COM_FLAGS (0)
+
+/* firmware stuff */
+#define ZL_MAX_BLOCKS   16
+#define DRIVER_VERSION  0x02010203
+#define RAM_SIZE 0x80000
+
+enum zblock_type {
+        ZBLOCK_PRG = 0,
+        ZBLOCK_FPGA = 1
+};
+
+struct zfile_header {
+        char name[64];
+        char date[32];
+        char aux[32];
+        u32 n_config;
+        u32 config_offset;
+        u32 n_blocks;
+        u32 block_offset;
+        u32 reserved[9];
+} __attribute__ ((packed));
+
+struct zfile_config {
+        char name[64];
+        u32 mailbox;
+        u32 function;
+        u32 n_blocks;
+        u32 block_list[ZL_MAX_BLOCKS];
+} __attribute__ ((packed));
+
+struct zfile_block {
+        u32 type;
+        u32 file_offset;
+        u32 ram_offset;
+        u32 size;
+} __attribute__ ((packed));
+
+static struct tty_driver *cy_serial_driver;
+
+#ifdef CONFIG_ISA
+/* This is the address lookup table. The driver will probe for
+   Cyclom-Y/ISA boards at all addresses in here. If you want the
+   driver to probe addresses at a different address, add it to
+   this table.  If the driver is probing some other board and
+   causing problems, remove the offending address from this table.
+*/
+
+static unsigned int cy_isa_addresses[] = {
+        0xD0000,
+        0xD2000,
+        0xD4000,
+        0xD6000,
+        0xD8000,
+        0xDA000,
+        0xDC000,
+        0xDE000,
+        0, 0, 0, 0, 0, 0, 0, 0
+};
+
+#define NR_ISA_ADDRS ARRAY_SIZE(cy_isa_addresses)
+
+static long maddr[NR_CARDS];
+static int irq[NR_CARDS];
+
+module_param_array(maddr, long, NULL, 0);
+module_param_array(irq, int, NULL, 0);
+
+#endif                          /* CONFIG_ISA */
+
+/* This is the per-card data structure containing address, irq, number of
+   channels, etc. This driver supports a maximum of NR_CARDS cards.
+*/
+static struct cyclades_card cy_card[NR_CARDS];
+
+static int cy_next_channel;     /* next minor available */
+
+/*
+ * This is used to look up the divisor speeds and the timeouts
+ * We're normally limited to 15 distinct baud rates.  The extra
+ * are accessed via settings in info->port.flags.
+ *      0,     1,     2,     3,     4,     5,     6,     7,     8,     9,
+ *     10,    11,    12,    13,    14,    15,    16,    17,    18,    19,
+ *                                               HI            VHI
+ *     20
+ */
+static const int baud_table[] = {
+        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
+        1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200, 150000,
+        230400, 0
+};
+
+static const char baud_co_25[] = {      /* 25 MHz clock option table */
+        /* value =>    00    01   02    03    04 */
+        /* divide by    8    32   128   512  2048 */
+        0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
+        0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+static const char baud_bpr_25[] = {     /* 25 MHz baud rate period table */
+        0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
+        0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15
+};
+
+static const char baud_co_60[] = {      /* 60 MHz clock option table (CD1400 J) */
+        /* value =>    00    01   02    03    04 */
+        /* divide by    8    32   128   512  2048 */
+        0x00, 0x00, 0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03,
+        0x03, 0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00
+};
+
+static const char baud_bpr_60[] = {     /* 60 MHz baud rate period table (CD1400 J) */
+        0x00, 0x82, 0x21, 0xff, 0xdb, 0xc3, 0x92, 0x62, 0xc3, 0x62,
+        0x41, 0xc3, 0x62, 0xc3, 0x62, 0xc3, 0x82, 0x62, 0x41, 0x32,
+        0x21
+};
+
+static const char baud_cor3[] = {       /* receive threshold */
+        0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
+        0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07,
+        0x07
+};
+
+/*
+ * The Cyclades driver implements HW flow control as any serial driver.
+ * The cyclades_port structure member rflow and the vector rflow_thr
+ * allows us to take advantage of a special feature in the CD1400 to avoid
+ * data loss even when the system interrupt latency is too high. These flags
+ * are to be used only with very special applications. Setting these flags
+ * requires the use of a special cable (DTR and RTS reversed). In the new
+ * CD1400-based boards (rev. 6.00 or later), there is no need for special
+ * cables.
+ */
+
+static const char rflow_thr[] = {       /* rflow threshold */
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
+        0x0a
+};
+
+/*  The Cyclom-Ye has placed the sequential chips in non-sequential
+ *  address order.  This look-up table overcomes that problem.
+ */
+static const unsigned int cy_chip_offset[] = { 0x0000,
+        0x0400,
+        0x0800,
+        0x0C00,
+        0x0200,
+        0x0600,
+        0x0A00,
+        0x0E00
+};
+
+/* PCI related definitions */
+
+#ifdef CONFIG_PCI
+static const struct pci_device_id cy_pci_dev_id[] = {
+        /* PCI < 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Y_Lo) },
+        /* PCI > 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Y_Hi) },
+        /* 4Y PCI < 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_4Y_Lo) },
+        /* 4Y PCI > 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_4Y_Hi) },
+        /* 8Y PCI < 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_8Y_Lo) },
+        /* 8Y PCI > 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_8Y_Hi) },
+        /* Z PCI < 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Z_Lo) },
+        /* Z PCI > 1Mb */
+        { PCI_DEVICE(PCI_VENDOR_ID_CYCLADES, PCI_DEVICE_ID_CYCLOM_Z_Hi) },
+        { }                     /* end of table */
+};
+MODULE_DEVICE_TABLE(pci, cy_pci_dev_id);
+#endif
+
+static void cy_start(struct tty_struct *);
+static void cy_set_line_char(struct cyclades_port *, struct tty_struct *);
+static int cyz_issue_cmd(struct cyclades_card *, __u32, __u8, __u32);
+#ifdef CONFIG_ISA
+static unsigned detect_isa_irq(void __iomem *);
+#endif                          /* CONFIG_ISA */
+
+#ifndef CONFIG_CYZ_INTR
+static void cyz_poll(unsigned long);
+
+/* The Cyclades-Z polling cycle is defined by this variable */
+static long cyz_polling_cycle = CZ_DEF_POLL;
+
+static DEFINE_TIMER(cyz_timerlist, cyz_poll, 0, 0);
+
+#else                           /* CONFIG_CYZ_INTR */
+static void cyz_rx_restart(unsigned long);
+static struct timer_list cyz_rx_full_timer[NR_PORTS];
+#endif                          /* CONFIG_CYZ_INTR */
+
+static inline void cyy_writeb(struct cyclades_port *port, u32 reg, u8 val)
+{
+        struct cyclades_card *card = port->card;
+
+        cy_writeb(port->u.cyy.base_addr + (reg << card->bus_index), val);
+}
+
+static inline u8 cyy_readb(struct cyclades_port *port, u32 reg)
+{
+        struct cyclades_card *card = port->card;
+
+        return readb(port->u.cyy.base_addr + (reg << card->bus_index));
+}
+
+static inline bool cy_is_Z(struct cyclades_card *card)
+{
+        return card->num_chips == (unsigned int)-1;
+}
+
+static inline bool __cyz_fpga_loaded(struct RUNTIME_9060 __iomem *ctl_addr)
+{
+        return readl(&ctl_addr->init_ctrl) & (1 << 17);
+}
+
+static inline bool cyz_fpga_loaded(struct cyclades_card *card)
+{
+        return __cyz_fpga_loaded(card->ctl_addr.p9060);
+}
+
+static inline bool cyz_is_loaded(struct cyclades_card *card)
+{
+        struct FIRM_ID __iomem *fw_id = card->base_addr + ID_ADDRESS;
+
+        return (card->hw_ver == ZO_V1 || cyz_fpga_loaded(card)) &&
+                        readl(&fw_id->signature) == ZFIRM_ID;
+}
+
+static inline int serial_paranoia_check(struct cyclades_port *info,
+                const char *name, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+        if (!info) {
+                printk(KERN_WARNING "cyc Warning: null cyclades_port for (%s) "
+                                "in %s\n", name, routine);
+                return 1;
+        }
+
+        if (info->magic != CYCLADES_MAGIC) {
+                printk(KERN_WARNING "cyc Warning: bad magic number for serial "
+                                "struct (%s) in %s\n", name, routine);
+                return 1;
+        }
+#endif
+        return 0;
+}
+
+/***********************************************************/
+/********* Start of block of Cyclom-Y specific code ********/
+
+/* This routine waits up to 1000 micro-seconds for the previous
+   command to the Cirrus chip to complete and then issues the
+   new command.  An error is returned if the previous command
+   didn't finish within the time limit.
+
+   This function is only called from inside spinlock-protected code.
+ */
+static int __cyy_issue_cmd(void __iomem *base_addr, u8 cmd, int index)
+{
+        void __iomem *ccr = base_addr + (CyCCR << index);
+        unsigned int i;
+
+        /* Check to see that the previous command has completed */
+        for (i = 0; i < 100; i++) {
+                if (readb(ccr) == 0)
+                        break;
+                udelay(10L);
+        }
+        /* if the CCR never cleared, the previous command
+           didn't finish within the "reasonable time" */
+        if (i == 100)
+                return -1;
+
+        /* Issue the new command */
+        cy_writeb(ccr, cmd);
+
+        return 0;
+}
+
+static inline int cyy_issue_cmd(struct cyclades_port *port, u8 cmd)
+{
+        return __cyy_issue_cmd(port->u.cyy.base_addr, cmd,
+                        port->card->bus_index);
+}
+
+#ifdef CONFIG_ISA
+/* ISA interrupt detection code */
+static unsigned detect_isa_irq(void __iomem *address)
+{
+        int irq;
+        unsigned long irqs, flags;
+        int save_xir, save_car;
+        int index = 0;          /* IRQ probing is only for ISA */
+
+        /* forget possible initially masked and pending IRQ */
+        irq = probe_irq_off(probe_irq_on());
+
+        /* Clear interrupts on the board first */
+        cy_writeb(address + (Cy_ClrIntr << index), 0);
+        /* Cy_ClrIntr is 0x1800 */
+
+        irqs = probe_irq_on();
+        /* Wait ... */
+        msleep(5);
+
+        /* Enable the Tx interrupts on the CD1400 */
+        local_irq_save(flags);
+        cy_writeb(address + (CyCAR << index), 0);
+        __cyy_issue_cmd(address, CyCHAN_CTL | CyENB_XMTR, index);
+
+        cy_writeb(address + (CyCAR << index), 0);
+        cy_writeb(address + (CySRER << index),
+                  readb(address + (CySRER << index)) | CyTxRdy);
+        local_irq_restore(flags);
+
+        /* Wait ... */
+        msleep(5);
+
+        /* Check which interrupt is in use */
+        irq = probe_irq_off(irqs);
+
+        /* Clean up */
+        save_xir = (u_char) readb(address + (CyTIR << index));
+        save_car = readb(address + (CyCAR << index));
+        cy_writeb(address + (CyCAR << index), (save_xir & 0x3));
+        cy_writeb(address + (CySRER << index),
+                  readb(address + (CySRER << index)) & ~CyTxRdy);
+        cy_writeb(address + (CyTIR << index), (save_xir & 0x3f));
+        cy_writeb(address + (CyCAR << index), (save_car));
+        cy_writeb(address + (Cy_ClrIntr << index), 0);
+        /* Cy_ClrIntr is 0x1800 */
+
+        return (irq > 0) ? irq : 0;
+}
+#endif                          /* CONFIG_ISA */
+
+static void cyy_chip_rx(struct cyclades_card *cinfo, int chip,
+                void __iomem *base_addr)
+{
+        struct cyclades_port *info;
+        struct tty_struct *tty;
+        int len, index = cinfo->bus_index;
+        u8 ivr, save_xir, channel, save_car, data, char_count;
+
+#ifdef CY_DEBUG_INTERRUPTS
+        printk(KERN_DEBUG "cyy_interrupt: rcvd intr, chip %d\n", chip);
+#endif
+        /* determine the channel & change to that context */
+        save_xir = readb(base_addr + (CyRIR << index));
+        channel = save_xir & CyIRChannel;
+        info = &cinfo->ports[channel + chip * 4];
+        save_car = cyy_readb(info, CyCAR);
+        cyy_writeb(info, CyCAR, save_xir);
+        ivr = cyy_readb(info, CyRIVR) & CyIVRMask;
+
+        tty = tty_port_tty_get(&info->port);
+        /* if there is nowhere to put the data, discard it */
+        if (tty == NULL) {
+                if (ivr == CyIVRRxEx) { /* exception */
+                        data = cyy_readb(info, CyRDSR);
+                } else {        /* normal character reception */
+                        char_count = cyy_readb(info, CyRDCR);
+                        while (char_count--)
+                                data = cyy_readb(info, CyRDSR);
+                }
+                goto end;
+        }
+        /* there is an open port for this data */
+        if (ivr == CyIVRRxEx) { /* exception */
+                data = cyy_readb(info, CyRDSR);
+
+                /* For statistics only */
+                if (data & CyBREAK)
+                        info->icount.brk++;
+                else if (data & CyFRAME)
+                        info->icount.frame++;
+                else if (data & CyPARITY)
+                        info->icount.parity++;
+                else if (data & CyOVERRUN)
+                        info->icount.overrun++;
+
+                if (data & info->ignore_status_mask) {
+                        info->icount.rx++;
+                        tty_kref_put(tty);
+                        return;
+                }
+                if (tty_buffer_request_room(tty, 1)) {
+                        if (data & info->read_status_mask) {
+                                if (data & CyBREAK) {
+                                        tty_insert_flip_char(tty,
+                                                cyy_readb(info, CyRDSR),
+                                                TTY_BREAK);
+                                        info->icount.rx++;
+                                        if (info->port.flags & ASYNC_SAK)
+                                                do_SAK(tty);
+                                } else if (data & CyFRAME) {
+                                        tty_insert_flip_char(tty,
+                                                cyy_readb(info, CyRDSR),
+                                                TTY_FRAME);
+                                        info->icount.rx++;
+                                        info->idle_stats.frame_errs++;
+                                } else if (data & CyPARITY) {
+                                        /* Pieces of seven... */
+                                        tty_insert_flip_char(tty,
+                                                cyy_readb(info, CyRDSR),
+                                                TTY_PARITY);
+                                        info->icount.rx++;
+                                        info->idle_stats.parity_errs++;
+                                } else if (data & CyOVERRUN) {
+                                        tty_insert_flip_char(tty, 0,
+                                                        TTY_OVERRUN);
+                                        info->icount.rx++;
+                                        /* If the flip buffer itself is
+                                           overflowing, we still lose
+                                           the next incoming character.
+                                         */
+                                        tty_insert_flip_char(tty,
+                                                cyy_readb(info, CyRDSR),
+                                                TTY_FRAME);
+                                        info->icount.rx++;
+                                        info->idle_stats.overruns++;
+                                /* These two conditions may imply */
+                                /* a normal read should be done. */
+                                /* } else if(data & CyTIMEOUT) { */
+                                /* } else if(data & CySPECHAR) { */
+                                } else {
+                                        tty_insert_flip_char(tty, 0,
+                                                        TTY_NORMAL);
+                                        info->icount.rx++;
+                                }
+                        } else {
+                                tty_insert_flip_char(tty, 0, TTY_NORMAL);
+                                info->icount.rx++;
+                        }
+                } else {
+                        /* there was a software buffer overrun and nothing
+                         * could be done about it!!! */
+                        info->icount.buf_overrun++;
+                        info->idle_stats.overruns++;
+                }
+        } else {        /* normal character reception */
+                /* load # chars available from the chip */
+                char_count = cyy_readb(info, CyRDCR);
+
+#ifdef CY_ENABLE_MONITORING
+                ++info->mon.int_count;
+                info->mon.char_count += char_count;
+                if (char_count > info->mon.char_max)
+                        info->mon.char_max = char_count;
+                info->mon.char_last = char_count;
+#endif
+                len = tty_buffer_request_room(tty, char_count);
+                while (len--) {
+                        data = cyy_readb(info, CyRDSR);
+                        tty_insert_flip_char(tty, data, TTY_NORMAL);
+                        info->idle_stats.recv_bytes++;
+                        info->icount.rx++;
+#ifdef CY_16Y_HACK
+                        udelay(10L);
+#endif
+                }
+                info->idle_stats.recv_idle = jiffies;
+        }
+        tty_schedule_flip(tty);
+        tty_kref_put(tty);
+end:
+        /* end of service */
+        cyy_writeb(info, CyRIR, save_xir & 0x3f);
+        cyy_writeb(info, CyCAR, save_car);
+}
+
+static void cyy_chip_tx(struct cyclades_card *cinfo, unsigned int chip,
+                void __iomem *base_addr)
+{
+        struct cyclades_port *info;
+        struct tty_struct *tty;
+        int char_count, index = cinfo->bus_index;
+        u8 save_xir, channel, save_car, outch;
+
+        /* Since we only get here when the transmit buffer
+           is empty, we know we can always stuff a dozen
+           characters. */
+#ifdef CY_DEBUG_INTERRUPTS
+        printk(KERN_DEBUG "cyy_interrupt: xmit intr, chip %d\n", chip);
+#endif
+
+        /* determine the channel & change to that context */
+        save_xir = readb(base_addr + (CyTIR << index));
+        channel = save_xir & CyIRChannel;
+        save_car = readb(base_addr + (CyCAR << index));
+        cy_writeb(base_addr + (CyCAR << index), save_xir);
+
+        info = &cinfo->ports[channel + chip * 4];
+        tty = tty_port_tty_get(&info->port);
+        if (tty == NULL) {
+                cyy_writeb(info, CySRER, cyy_readb(info, CySRER) & ~CyTxRdy);
+                goto end;
+        }
+
+        /* load the on-chip space for outbound data */
+        char_count = info->xmit_fifo_size;
+
+        if (info->x_char) {     /* send special char */
+                outch = info->x_char;
+                cyy_writeb(info, CyTDR, outch);
+                char_count--;
+                info->icount.tx++;
+                info->x_char = 0;
+        }
+
+        if (info->breakon || info->breakoff) {
+                if (info->breakon) {
+                        cyy_writeb(info, CyTDR, 0);
+                        cyy_writeb(info, CyTDR, 0x81);
+                        info->breakon = 0;
+                        char_count -= 2;
+                }
+                if (info->breakoff) {
+                        cyy_writeb(info, CyTDR, 0);
+                        cyy_writeb(info, CyTDR, 0x83);
+                        info->breakoff = 0;
+                        char_count -= 2;
+                }
+        }
+
+        while (char_count-- > 0) {
+                if (!info->xmit_cnt) {
+                        if (cyy_readb(info, CySRER) & CyTxMpty) {
+                                cyy_writeb(info, CySRER,
+                                        cyy_readb(info, CySRER) & ~CyTxMpty);
+                        } else {
+                                cyy_writeb(info, CySRER, CyTxMpty |
+                                        (cyy_readb(info, CySRER) & ~CyTxRdy));
+                        }
+                        goto done;
+                }
+                if (info->port.xmit_buf == NULL) {
+                        cyy_writeb(info, CySRER,
+                                cyy_readb(info, CySRER) & ~CyTxRdy);
+                        goto done;
+                }
+                if (tty->stopped || tty->hw_stopped) {
+                        cyy_writeb(info, CySRER,
+                                cyy_readb(info, CySRER) & ~CyTxRdy);
+                        goto done;
+                }
+                /* Because the Embedded Transmit Commands have been enabled,
+                 * we must check to see if the escape character, NULL, is being
+                 * sent. If it is, we must ensure that there is room for it to
+                 * be doubled in the output stream.  Therefore we no longer
+                 * advance the pointer when the character is fetched, but
+                 * rather wait until after the check for a NULL output
+                 * character. This is necessary because there may not be room
+                 * for the two chars needed to send a NULL.)
+                 */
+                outch = info->port.xmit_buf[info->xmit_tail];
+                if (outch) {
+                        info->xmit_cnt--;
+                        info->xmit_tail = (info->xmit_tail + 1) &
+                                        (SERIAL_XMIT_SIZE - 1);
+                        cyy_writeb(info, CyTDR, outch);
+                        info->icount.tx++;
+                } else {
+                        if (char_count > 1) {
+                                info->xmit_cnt--;
+                                info->xmit_tail = (info->xmit_tail + 1) &
+                                        (SERIAL_XMIT_SIZE - 1);
+                                cyy_writeb(info, CyTDR, outch);
+                                cyy_writeb(info, CyTDR, 0);
+                                info->icount.tx++;
+                                char_count--;
+                        }
+                }
+        }
+
+done:
+        tty_wakeup(tty);
+        tty_kref_put(tty);
+end:
+        /* end of service */
+        cyy_writeb(info, CyTIR, save_xir & 0x3f);
+        cyy_writeb(info, CyCAR, save_car);
+}
+
+static void cyy_chip_modem(struct cyclades_card *cinfo, int chip,
+                void __iomem *base_addr)
+{
+        struct cyclades_port *info;
+        struct tty_struct *tty;
+        int index = cinfo->bus_index;
+        u8 save_xir, channel, save_car, mdm_change, mdm_status;
+
+        /* determine the channel & change to that context */
+        save_xir = readb(base_addr + (CyMIR << index));
+        channel = save_xir & CyIRChannel;
+        info = &cinfo->ports[channel + chip * 4];
+        save_car = cyy_readb(info, CyCAR);
+        cyy_writeb(info, CyCAR, save_xir);
+
+        mdm_change = cyy_readb(info, CyMISR);
+        mdm_status = cyy_readb(info, CyMSVR1);
+
+        tty = tty_port_tty_get(&info->port);
+        if (!tty)
+                goto end;
+
+        if (mdm_change & CyANY_DELTA) {
+                /* For statistics only */
+                if (mdm_change & CyDCD)
+                        info->icount.dcd++;
+                if (mdm_change & CyCTS)
+                        info->icount.cts++;
+                if (mdm_change & CyDSR)
+                        info->icount.dsr++;
+                if (mdm_change & CyRI)
+                        info->icount.rng++;
+
+                wake_up_interruptible(&info->port.delta_msr_wait);
+        }
+
+        if ((mdm_change & CyDCD) && (info->port.flags & ASYNC_CHECK_CD)) {
+                if (mdm_status & CyDCD)
+                        wake_up_interruptible(&info->port.open_wait);
+                else
+                        tty_hangup(tty);
+        }
+        if ((mdm_change & CyCTS) && (info->port.flags & ASYNC_CTS_FLOW)) {
+                if (tty->hw_stopped) {
+                        if (mdm_status & CyCTS) {
+                                /* cy_start isn't used
+                                   because... !!! */
+                                tty->hw_stopped = 0;
+                                cyy_writeb(info, CySRER,
+                                        cyy_readb(info, CySRER) | CyTxRdy);
+                                tty_wakeup(tty);
+                        }
+                } else {
+                        if (!(mdm_status & CyCTS)) {
+                                /* cy_stop isn't used
+                                   because ... !!! */
+                                tty->hw_stopped = 1;
+                                cyy_writeb(info, CySRER,
+                                        cyy_readb(info, CySRER) & ~CyTxRdy);
+                        }
+                }
+        }
+/*      if (mdm_change & CyDSR) {
+        }
+        if (mdm_change & CyRI) {
+        }*/
+        tty_kref_put(tty);
+end:
+        /* end of service */
+        cyy_writeb(info, CyMIR, save_xir & 0x3f);
+        cyy_writeb(info, CyCAR, save_car);
+}
+
+/* The real interrupt service routine is called
+   whenever the card wants its hand held--chars
+   received, out buffer empty, modem change, etc.
+ */
+static irqreturn_t cyy_interrupt(int irq, void *dev_id)
+{
+        int status;
+        struct cyclades_card *cinfo = dev_id;
+        void __iomem *base_addr, *card_base_addr;
+        unsigned int chip, too_many, had_work;
+        int index;
+
+        if (unlikely(cinfo == NULL)) {
+#ifdef CY_DEBUG_INTERRUPTS
+                printk(KERN_DEBUG "cyy_interrupt: spurious interrupt %d\n",
+                                irq);
+#endif
+                return IRQ_NONE;        /* spurious interrupt */
+        }
+
+        card_base_addr = cinfo->base_addr;
+        index = cinfo->bus_index;
+
+        /* card was not initialized yet (e.g. DEBUG_SHIRQ) */
+        if (unlikely(card_base_addr == NULL))
+                return IRQ_HANDLED;
+
+        /* This loop checks all chips in the card.  Make a note whenever
+           _any_ chip had some work to do, as this is considered an
+           indication that there will be more to do.  Only when no chip
+           has any work does this outermost loop exit.
+         */
+        do {
+                had_work = 0;
+                for (chip = 0; chip < cinfo->num_chips; chip++) {
+                        base_addr = cinfo->base_addr +
+                                        (cy_chip_offset[chip] << index);
+                        too_many = 0;
+                        while ((status = readb(base_addr +
+                                                (CySVRR << index))) != 0x00) {
+                                had_work++;
+                        /* The purpose of the following test is to ensure that
+                           no chip can monopolize the driver.  This forces the
+                           chips to be checked in a round-robin fashion (after
+                           draining each of a bunch (1000) of characters).
+                         */
+                                if (1000 < too_many++)
+                                        break;
+                                spin_lock(&cinfo->card_lock);
+                                if (status & CySRReceive) /* rx intr */
+                                        cyy_chip_rx(cinfo, chip, base_addr);
+                                if (status & CySRTransmit) /* tx intr */
+                                        cyy_chip_tx(cinfo, chip, base_addr);
+                                if (status & CySRModem) /* modem intr */
+                                        cyy_chip_modem(cinfo, chip, base_addr);
+                                spin_unlock(&cinfo->card_lock);
+                        }
+                }
+        } while (had_work);
+
+        /* clear interrupts */
+        spin_lock(&cinfo->card_lock);
+        cy_writeb(card_base_addr + (Cy_ClrIntr << index), 0);
+        /* Cy_ClrIntr is 0x1800 */
+        spin_unlock(&cinfo->card_lock);
+        return IRQ_HANDLED;
+}                               /* cyy_interrupt */
+
+static void cyy_change_rts_dtr(struct cyclades_port *info, unsigned int set,
+                unsigned int clear)
+{
+        struct cyclades_card *card = info->card;
+        int channel = info->line - card->first_line;
+        u32 rts, dtr, msvrr, msvrd;
+
+        channel &= 0x03;
+
+        if (info->rtsdtr_inv) {
+                msvrr = CyMSVR2;
+                msvrd = CyMSVR1;
+                rts = CyDTR;
+                dtr = CyRTS;
+        } else {
+                msvrr = CyMSVR1;
+                msvrd = CyMSVR2;
+                rts = CyRTS;
+                dtr = CyDTR;
+        }
+        if (set & TIOCM_RTS) {
+                cyy_writeb(info, CyCAR, channel);
+                cyy_writeb(info, msvrr, rts);
+        }
+        if (clear & TIOCM_RTS) {
+                cyy_writeb(info, CyCAR, channel);
+                cyy_writeb(info, msvrr, ~rts);
+        }
+        if (set & TIOCM_DTR) {
+                cyy_writeb(info, CyCAR, channel);
+                cyy_writeb(info, msvrd, dtr);
+#ifdef CY_DEBUG_DTR
+                printk(KERN_DEBUG "cyc:set_modem_info raising DTR\n");
+                printk(KERN_DEBUG "     status: 0x%x, 0x%x\n",
+                        cyy_readb(info, CyMSVR1),
+                        cyy_readb(info, CyMSVR2));
+#endif
+        }
+        if (clear & TIOCM_DTR) {
+                cyy_writeb(info, CyCAR, channel);
+                cyy_writeb(info, msvrd, ~dtr);
+#ifdef CY_DEBUG_DTR
+                printk(KERN_DEBUG "cyc:set_modem_info dropping DTR\n");
+                printk(KERN_DEBUG "     status: 0x%x, 0x%x\n",
+                        cyy_readb(info, CyMSVR1),
+                        cyy_readb(info, CyMSVR2));
+#endif
+        }
+}
+
+/***********************************************************/
+/********* End of block of Cyclom-Y specific code **********/
+/******** Start of block of Cyclades-Z specific code *******/
+/***********************************************************/
+
+static int
+cyz_fetch_msg(struct cyclades_card *cinfo,
+                __u32 *channel, __u8 *cmd, __u32 *param)
+{
+        struct BOARD_CTRL __iomem *board_ctrl = cinfo->board_ctrl;
+        unsigned long loc_doorbell;
+
+        loc_doorbell = readl(&cinfo->ctl_addr.p9060->loc_doorbell);
+        if (loc_doorbell) {
+                *cmd = (char)(0xff & loc_doorbell);
+                *channel = readl(&board_ctrl->fwcmd_channel);
+                *param = (__u32) readl(&board_ctrl->fwcmd_param);
+                cy_writel(&cinfo->ctl_addr.p9060->loc_doorbell, 0xffffffff);
+                return 1;
+        }
+        return 0;
+}                               /* cyz_fetch_msg */
+
+static int
+cyz_issue_cmd(struct cyclades_card *cinfo,
+                __u32 channel, __u8 cmd, __u32 param)
+{
+        struct BOARD_CTRL __iomem *board_ctrl = cinfo->board_ctrl;
+        __u32 __iomem *pci_doorbell;
+        unsigned int index;
+
+        if (!cyz_is_loaded(cinfo))
+                return -1;
+
+        index = 0;
+        pci_doorbell = &cinfo->ctl_addr.p9060->pci_doorbell;
+        while ((readl(pci_doorbell) & 0xff) != 0) {
+                if (index++ == 1000)
+                        return (int)(readl(pci_doorbell) & 0xff);
+                udelay(50L);
+        }
+        cy_writel(&board_ctrl->hcmd_channel, channel);
+        cy_writel(&board_ctrl->hcmd_param, param);
+        cy_writel(pci_doorbell, (long)cmd);
+
+        return 0;
+}                               /* cyz_issue_cmd */
+
+static void cyz_handle_rx(struct cyclades_port *info, struct tty_struct *tty)
+{
+        struct BUF_CTRL __iomem *buf_ctrl = info->u.cyz.buf_ctrl;
+        struct cyclades_card *cinfo = info->card;
+        unsigned int char_count;
+        int len;
+#ifdef BLOCKMOVE
+        unsigned char *buf;
+#else
+        char data;
+#endif
+        __u32 rx_put, rx_get, new_rx_get, rx_bufsize, rx_bufaddr;
+
+        rx_get = new_rx_get = readl(&buf_ctrl->rx_get);
+        rx_put = readl(&buf_ctrl->rx_put);
+        rx_bufsize = readl(&buf_ctrl->rx_bufsize);
+        rx_bufaddr = readl(&buf_ctrl->rx_bufaddr);
+        if (rx_put >= rx_get)
+                char_count = rx_put - rx_get;
+        else
+                char_count = rx_put - rx_get + rx_bufsize;
+
+        if (char_count) {
+#ifdef CY_ENABLE_MONITORING
+                info->mon.int_count++;
+                info->mon.char_count += char_count;
+                if (char_count > info->mon.char_max)
+                        info->mon.char_max = char_count;
+                info->mon.char_last = char_count;
+#endif
+                if (tty == NULL) {
+                        /* flush received characters */
+                        new_rx_get = (new_rx_get + char_count) &
+                                        (rx_bufsize - 1);
+                        info->rflush_count++;
+                } else {
+#ifdef BLOCKMOVE
+                /* we'd like to use memcpy(t, f, n) and memset(s, c, count)
+                   for performance, but because of buffer boundaries, there
+                   may be several steps to the operation */
+                        while (1) {
+                                len = tty_prepare_flip_string(tty, &buf,
+                                                char_count);
+                                if (!len)
+                                        break;
+
+                                len = min_t(unsigned int, min(len, char_count),
+                                                rx_bufsize - new_rx_get);
+
+                                memcpy_fromio(buf, cinfo->base_addr +
+                                                rx_bufaddr + new_rx_get, len);
+
+                                new_rx_get = (new_rx_get + len) &
+                                                (rx_bufsize - 1);
+                                char_count -= len;
+                                info->icount.rx += len;
+                                info->idle_stats.recv_bytes += len;
+                        }
+#else
+                        len = tty_buffer_request_room(tty, char_count);
+                        while (len--) {
+                                data = readb(cinfo->base_addr + rx_bufaddr +
+                                                new_rx_get);
+                                new_rx_get = (new_rx_get + 1) &
+                                                        (rx_bufsize - 1);
+                                tty_insert_flip_char(tty, data, TTY_NORMAL);
+                                info->idle_stats.recv_bytes++;
+                                info->icount.rx++;
+                        }
+#endif
+#ifdef CONFIG_CYZ_INTR
+                /* Recalculate the number of chars in the RX buffer and issue
+                   a cmd in case it's higher than the RX high water mark */
+                        rx_put = readl(&buf_ctrl->rx_put);
+                        if (rx_put >= rx_get)
+                                char_count = rx_put - rx_get;
+                        else
+                                char_count = rx_put - rx_get + rx_bufsize;
+                        if (char_count >= readl(&buf_ctrl->rx_threshold) &&
+                                        !timer_pending(&cyz_rx_full_timer[
+                                                        info->line]))
+                                mod_timer(&cyz_rx_full_timer[info->line],
+                                                jiffies + 1);
+#endif
+                        info->idle_stats.recv_idle = jiffies;
+                        tty_schedule_flip(tty);
+                }
+                /* Update rx_get */
+                cy_writel(&buf_ctrl->rx_get, new_rx_get);
+        }
+}
+
+static void cyz_handle_tx(struct cyclades_port *info, struct tty_struct *tty)
+{
+        struct BUF_CTRL __iomem *buf_ctrl = info->u.cyz.buf_ctrl;
+        struct cyclades_card *cinfo = info->card;
+        u8 data;
+        unsigned int char_count;
+#ifdef BLOCKMOVE
+        int small_count;
+#endif
+        __u32 tx_put, tx_get, tx_bufsize, tx_bufaddr;
+
+        if (info->xmit_cnt <= 0)        /* Nothing to transmit */
+                return;
+
+        tx_get = readl(&buf_ctrl->tx_get);
+        tx_put = readl(&buf_ctrl->tx_put);
+        tx_bufsize = readl(&buf_ctrl->tx_bufsize);
+        tx_bufaddr = readl(&buf_ctrl->tx_bufaddr);
+        if (tx_put >= tx_get)
+                char_count = tx_get - tx_put - 1 + tx_bufsize;
+        else
+                char_count = tx_get - tx_put - 1;
+
+        if (char_count) {
+
+                if (tty == NULL)
+                        goto ztxdone;
+
+                if (info->x_char) {     /* send special char */
+                        data = info->x_char;
+
+                        cy_writeb(cinfo->base_addr + tx_bufaddr + tx_put, data);
+                        tx_put = (tx_put + 1) & (tx_bufsize - 1);
+                        info->x_char = 0;
+                        char_count--;
+                        info->icount.tx++;
+                }
+#ifdef BLOCKMOVE
+                while (0 < (small_count = min_t(unsigned int,
+                                tx_bufsize - tx_put, min_t(unsigned int,
+                                        (SERIAL_XMIT_SIZE - info->xmit_tail),
+                                        min_t(unsigned int, info->xmit_cnt,
+                                                char_count))))) {
+
+                        memcpy_toio((char *)(cinfo->base_addr + tx_bufaddr +
+                                        tx_put),
+                                        &info->port.xmit_buf[info->xmit_tail],
+                                        small_count);
+
+                        tx_put = (tx_put + small_count) & (tx_bufsize - 1);
+                        char_count -= small_count;
+                        info->icount.tx += small_count;
+                        info->xmit_cnt -= small_count;
+                        info->xmit_tail = (info->xmit_tail + small_count) &
+                                        (SERIAL_XMIT_SIZE - 1);
+                }
+#else
+                while (info->xmit_cnt && char_count) {
+                        data = info->port.xmit_buf[info->xmit_tail];
+                        info->xmit_cnt--;
+                        info->xmit_tail = (info->xmit_tail + 1) &
+                                        (SERIAL_XMIT_SIZE - 1);
+
+                        cy_writeb(cinfo->base_addr + tx_bufaddr + tx_put, data);
+                        tx_put = (tx_put + 1) & (tx_bufsize - 1);
+                        char_count--;
+                        info->icount.tx++;
+                }
+#endif
+                tty_wakeup(tty);
+ztxdone:
+                /* Update tx_put */
+                cy_writel(&buf_ctrl->tx_put, tx_put);
+        }
+}
+
+static void cyz_handle_cmd(struct cyclades_card *cinfo)
+{
+        struct BOARD_CTRL __iomem *board_ctrl = cinfo->board_ctrl;
+        struct tty_struct *tty;
+        struct cyclades_port *info;
+        __u32 channel, param, fw_ver;
+        __u8 cmd;
+        int special_count;
+        int delta_count;
+
+        fw_ver = readl(&board_ctrl->fw_version);
+
+        while (cyz_fetch_msg(cinfo, &channel, &cmd, &param) == 1) {
+                special_count = 0;
+                delta_count = 0;
+                info = &cinfo->ports[channel];
+                tty = tty_port_tty_get(&info->port);
+                if (tty == NULL)
+                        continue;
+
+                switch (cmd) {
+                case C_CM_PR_ERROR:
+                        tty_insert_flip_char(tty, 0, TTY_PARITY);
+                        info->icount.rx++;
+                        special_count++;
+                        break;
+                case C_CM_FR_ERROR:
+                        tty_insert_flip_char(tty, 0, TTY_FRAME);
+                        info->icount.rx++;
+                        special_count++;
+                        break;
+                case C_CM_RXBRK:
+                        tty_insert_flip_char(tty, 0, TTY_BREAK);
+                        info->icount.rx++;
+                        special_count++;
+                        break;
+                case C_CM_MDCD:
+                        info->icount.dcd++;
+                        delta_count++;
+                        if (info->port.flags & ASYNC_CHECK_CD) {
+                                u32 dcd = fw_ver > 241 ? param :
+                                        readl(&info->u.cyz.ch_ctrl->rs_status);
+                                if (dcd & C_RS_DCD)
+                                        wake_up_interruptible(&info->port.open_wait);
+                                else
+                                        tty_hangup(tty);
+                        }
+                        break;
+                case C_CM_MCTS:
+                        info->icount.cts++;
+                        delta_count++;
+                        break;
+                case C_CM_MRI:
+                        info->icount.rng++;
+                        delta_count++;
+                        break;
+                case C_CM_MDSR:
+                        info->icount.dsr++;
+                        delta_count++;
+                        break;
+#ifdef Z_WAKE
+                case C_CM_IOCTLW:
+                        complete(&info->shutdown_wait);
+                        break;
+#endif
+#ifdef CONFIG_CYZ_INTR
+                case C_CM_RXHIWM:
+                case C_CM_RXNNDT:
+                case C_CM_INTBACK2:
+                        /* Reception Interrupt */
+#ifdef CY_DEBUG_INTERRUPTS
+                        printk(KERN_DEBUG "cyz_interrupt: rcvd intr, card %d, "
+                                        "port %ld\n", info->card, channel);
+#endif
+                        cyz_handle_rx(info, tty);
+                        break;
+                case C_CM_TXBEMPTY:
+                case C_CM_TXLOWWM:
+                case C_CM_INTBACK:
+                        /* Transmission Interrupt */
+#ifdef CY_DEBUG_INTERRUPTS
+                        printk(KERN_DEBUG "cyz_interrupt: xmit intr, card %d, "
+                                        "port %ld\n", info->card, channel);
+#endif
+                        cyz_handle_tx(info, tty);
+                        break;
+#endif                          /* CONFIG_CYZ_INTR */
+                case C_CM_FATAL:
+                        /* should do something with this !!! */
+                        break;
+                default:
+                        break;
+                }
+                if (delta_count)
+                        wake_up_interruptible(&info->port.delta_msr_wait);
+                if (special_count)
+                        tty_schedule_flip(tty);
+                tty_kref_put(tty);
+        }
+}
+
+#ifdef CONFIG_CYZ_INTR
+static irqreturn_t cyz_interrupt(int irq, void *dev_id)
+{
+        struct cyclades_card *cinfo = dev_id;
+
+        if (unlikely(!cyz_is_loaded(cinfo))) {
+#ifdef CY_DEBUG_INTERRUPTS
+                printk(KERN_DEBUG "cyz_interrupt: board not yet loaded "
+                                "(IRQ%d).\n", irq);
+#endif
+                return IRQ_NONE;
+        }
+
+        /* Handle the interrupts */
+        cyz_handle_cmd(cinfo);
+
+        return IRQ_HANDLED;
+}                               /* cyz_interrupt */
+
+static void cyz_rx_restart(unsigned long arg)
+{
+        struct cyclades_port *info = (struct cyclades_port *)arg;
+        struct cyclades_card *card = info->card;
+        int retval;
+        __u32 channel = info->line - card->first_line;
+        unsigned long flags;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+        retval = cyz_issue_cmd(card, channel, C_CM_INTBACK2, 0L);
+        if (retval != 0) {
+                printk(KERN_ERR "cyc:cyz_rx_restart retval on ttyC%d was %x\n",
+                        info->line, retval);
+        }
+        spin_unlock_irqrestore(&card->card_lock, flags);
+}
+
+#else                           /* CONFIG_CYZ_INTR */
+
+static void cyz_poll(unsigned long arg)
+{
+        struct cyclades_card *cinfo;
+        struct cyclades_port *info;
+        unsigned long expires = jiffies + HZ;
+        unsigned int port, card;
+
+        for (card = 0; card < NR_CARDS; card++) {
+                cinfo = &cy_card[card];
+
+                if (!cy_is_Z(cinfo))
+                        continue;
+                if (!cyz_is_loaded(cinfo))
+                        continue;
+
+        /* Skip first polling cycle to avoid racing conditions with the FW */
+                if (!cinfo->intr_enabled) {
+                        cinfo->intr_enabled = 1;
+                        continue;
+                }
+
+                cyz_handle_cmd(cinfo);
+
+                for (port = 0; port < cinfo->nports; port++) {
+                        struct tty_struct *tty;
+
+                        info = &cinfo->ports[port];
+                        tty = tty_port_tty_get(&info->port);
+                        /* OK to pass NULL to the handle functions below.
+                           They need to drop the data in that case. */
+
+                        if (!info->throttle)
+                                cyz_handle_rx(info, tty);
+                        cyz_handle_tx(info, tty);
+                        tty_kref_put(tty);
+                }
+                /* poll every 'cyz_polling_cycle' period */
+                expires = jiffies + cyz_polling_cycle;
+        }
+        mod_timer(&cyz_timerlist, expires);
+}                               /* cyz_poll */
+
+#endif                          /* CONFIG_CYZ_INTR */
+
+/********** End of block of Cyclades-Z specific code *********/
+/***********************************************************/
+
+/* This is called whenever a port becomes active;
+   interrupts are enabled and DTR & RTS are turned on.
+ */
+static int cy_startup(struct cyclades_port *info, struct tty_struct *tty)
+{
+        struct cyclades_card *card;
+        unsigned long flags;
+        int retval = 0;
+        int channel;
+        unsigned long page;
+
+        card = info->card;
+        channel = info->line - card->first_line;
+
+        page = get_zeroed_page(GFP_KERNEL);
+        if (!page)
+                return -ENOMEM;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+
+        if (info->port.flags & ASYNC_INITIALIZED)
+                goto errout;
+
+        if (!info->type) {
+                set_bit(TTY_IO_ERROR, &tty->flags);
+                goto errout;
+        }
+
+        if (info->port.xmit_buf)
+                free_page(page);
+        else
+                info->port.xmit_buf = (unsigned char *)page;
+
+        spin_unlock_irqrestore(&card->card_lock, flags);
+
+        cy_set_line_char(info, tty);
+
+        if (!cy_is_Z(card)) {
+                channel &= 0x03;
+
+                spin_lock_irqsave(&card->card_lock, flags);
+
+                cyy_writeb(info, CyCAR, channel);
+
+                cyy_writeb(info, CyRTPR,
+                        (info->default_timeout ? info->default_timeout : 0x02));
+                /* 10ms rx timeout */
+
+                cyy_issue_cmd(info, CyCHAN_CTL | CyENB_RCVR | CyENB_XMTR);
+
+                cyy_change_rts_dtr(info, TIOCM_RTS | TIOCM_DTR, 0);
+
+                cyy_writeb(info, CySRER, cyy_readb(info, CySRER) | CyRxData);
+        } else {
+                struct CH_CTRL __iomem *ch_ctrl = info->u.cyz.ch_ctrl;
+
+                if (!cyz_is_loaded(card))
+                        return -ENODEV;
+
+#ifdef CY_DEBUG_OPEN
+                printk(KERN_DEBUG "cyc startup Z card %d, channel %d, "
+                        "base_addr %p\n", card, channel, card->base_addr);
+#endif
+                spin_lock_irqsave(&card->card_lock, flags);
+
+                cy_writel(&ch_ctrl->op_mode, C_CH_ENABLE);
+#ifdef Z_WAKE
+#ifdef CONFIG_CYZ_INTR
+                cy_writel(&ch_ctrl->intr_enable,
+                          C_IN_TXBEMPTY | C_IN_TXLOWWM | C_IN_RXHIWM |
+                          C_IN_RXNNDT | C_IN_IOCTLW | C_IN_MDCD);
+#else
+                cy_writel(&ch_ctrl->intr_enable,
+                          C_IN_IOCTLW | C_IN_MDCD);
+#endif                          /* CONFIG_CYZ_INTR */
+#else
+#ifdef CONFIG_CYZ_INTR
+                cy_writel(&ch_ctrl->intr_enable,
+                          C_IN_TXBEMPTY | C_IN_TXLOWWM | C_IN_RXHIWM |
+                          C_IN_RXNNDT | C_IN_MDCD);
+#else
+                cy_writel(&ch_ctrl->intr_enable, C_IN_MDCD);
+#endif                          /* CONFIG_CYZ_INTR */
+#endif                          /* Z_WAKE */
+
+                retval = cyz_issue_cmd(card, channel, C_CM_IOCTL, 0L);
+                if (retval != 0) {
+                        printk(KERN_ERR "cyc:startup(1) retval on ttyC%d was "
+                                "%x\n", info->line, retval);
+                }
+
+                /* Flush RX buffers before raising DTR and RTS */
+                retval = cyz_issue_cmd(card, channel, C_CM_FLUSH_RX, 0L);
+                if (retval != 0) {
+                        printk(KERN_ERR "cyc:startup(2) retval on ttyC%d was "
+                                "%x\n", info->line, retval);
+                }
+
+                /* set timeout !!! */
+                /* set RTS and DTR !!! */
+                tty_port_raise_dtr_rts(&info->port);
+
+                /* enable send, recv, modem !!! */
+        }
+
+        info->port.flags |= ASYNC_INITIALIZED;
+
+        clear_bit(TTY_IO_ERROR, &tty->flags);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+        info->breakon = info->breakoff = 0;
+        memset((char *)&info->idle_stats, 0, sizeof(info->idle_stats));
+        info->idle_stats.in_use =
+        info->idle_stats.recv_idle =
+        info->idle_stats.xmit_idle = jiffies;
+
+        spin_unlock_irqrestore(&card->card_lock, flags);
+
+#ifdef CY_DEBUG_OPEN
+        printk(KERN_DEBUG "cyc startup done\n");
+#endif
+        return 0;
+
+errout:
+        spin_unlock_irqrestore(&card->card_lock, flags);
+        free_page(page);
+        return retval;
+}                               /* startup */
+
+static void start_xmit(struct cyclades_port *info)
+{
+        struct cyclades_card *card = info->card;
+        unsigned long flags;
+        int channel = info->line - card->first_line;
+
+        if (!cy_is_Z(card)) {
+                spin_lock_irqsave(&card->card_lock, flags);
+                cyy_writeb(info, CyCAR, channel & 0x03);
+                cyy_writeb(info, CySRER, cyy_readb(info, CySRER) | CyTxRdy);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+        } else {
+#ifdef CONFIG_CYZ_INTR
+                int retval;
+
+                spin_lock_irqsave(&card->card_lock, flags);
+                retval = cyz_issue_cmd(card, channel, C_CM_INTBACK, 0L);
+                if (retval != 0) {
+                        printk(KERN_ERR "cyc:start_xmit retval on ttyC%d was "
+                                "%x\n", info->line, retval);
+                }
+                spin_unlock_irqrestore(&card->card_lock, flags);
+#else                           /* CONFIG_CYZ_INTR */
+                /* Don't have to do anything at this time */
+#endif                          /* CONFIG_CYZ_INTR */
+        }
+}                               /* start_xmit */
+
+/*
+ * This routine shuts down a serial port; interrupts are disabled,
+ * and DTR is dropped if the hangup on close termio flag is on.
+ */
+static void cy_shutdown(struct cyclades_port *info, struct tty_struct *tty)
+{
+        struct cyclades_card *card;
+        unsigned long flags;
+
+        if (!(info->port.flags & ASYNC_INITIALIZED))
+                return;
+
+        card = info->card;
+        if (!cy_is_Z(card)) {
+                spin_lock_irqsave(&card->card_lock, flags);
+
+                /* Clear delta_msr_wait queue to avoid mem leaks. */
+                wake_up_interruptible(&info->port.delta_msr_wait);
+
+                if (info->port.xmit_buf) {
+                        unsigned char *temp;
+                        temp = info->port.xmit_buf;
+                        info->port.xmit_buf = NULL;
+                        free_page((unsigned long)temp);
+                }
+                if (tty->termios->c_cflag & HUPCL)
+                        cyy_change_rts_dtr(info, 0, TIOCM_RTS | TIOCM_DTR);
+
+                cyy_issue_cmd(info, CyCHAN_CTL | CyDIS_RCVR);
+                /* it may be appropriate to clear _XMIT at
+                   some later date (after testing)!!! */
+
+                set_bit(TTY_IO_ERROR, &tty->flags);
+                info->port.flags &= ~ASYNC_INITIALIZED;
+                spin_unlock_irqrestore(&card->card_lock, flags);
+        } else {
+#ifdef CY_DEBUG_OPEN
+                int channel = info->line - card->first_line;
+                printk(KERN_DEBUG "cyc shutdown Z card %d, channel %d, "
+                        "base_addr %p\n", card, channel, card->base_addr);
+#endif
+
+                if (!cyz_is_loaded(card))
+                        return;
+
+                spin_lock_irqsave(&card->card_lock, flags);
+
+                if (info->port.xmit_buf) {
+                        unsigned char *temp;
+                        temp = info->port.xmit_buf;
+                        info->port.xmit_buf = NULL;
+                        free_page((unsigned long)temp);
+                }
+
+                if (tty->termios->c_cflag & HUPCL)
+                        tty_port_lower_dtr_rts(&info->port);
+
+                set_bit(TTY_IO_ERROR, &tty->flags);
+                info->port.flags &= ~ASYNC_INITIALIZED;
+
+                spin_unlock_irqrestore(&card->card_lock, flags);
+        }
+
+#ifdef CY_DEBUG_OPEN
+        printk(KERN_DEBUG "cyc shutdown done\n");
+#endif
+}                               /* shutdown */
+
+/*
+ * ------------------------------------------------------------
+ * cy_open() and friends
+ * ------------------------------------------------------------
+ */
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * performs the serial-specific initialization for the tty structure.
+ */
+static int cy_open(struct tty_struct *tty, struct file *filp)
+{
+        struct cyclades_port *info;
+        unsigned int i, line;
+        int retval;
+
+        line = tty->index;
+        if (tty->index < 0 || NR_PORTS <= line)
+                return -ENODEV;
+
+        for (i = 0; i < NR_CARDS; i++)
+                if (line < cy_card[i].first_line + cy_card[i].nports &&
+                                line >= cy_card[i].first_line)
+                        break;
+        if (i >= NR_CARDS)
+                return -ENODEV;
+        info = &cy_card[i].ports[line - cy_card[i].first_line];
+        if (info->line < 0)
+                return -ENODEV;
+
+        /* If the card's firmware hasn't been loaded,
+           treat it as absent from the system.  This
+           will make the user pay attention.
+         */
+        if (cy_is_Z(info->card)) {
+                struct cyclades_card *cinfo = info->card;
+                struct FIRM_ID __iomem *firm_id = cinfo->base_addr + ID_ADDRESS;
+
+                if (!cyz_is_loaded(cinfo)) {
+                        if (cinfo->hw_ver == ZE_V1 && cyz_fpga_loaded(cinfo) &&
+                                        readl(&firm_id->signature) ==
+                                        ZFIRM_HLT) {
+                                printk(KERN_ERR "cyc:Cyclades-Z Error: you "
+                                        "need an external power supply for "
+                                        "this number of ports.\nFirmware "
+                                        "halted.\n");
+                        } else {
+                                printk(KERN_ERR "cyc:Cyclades-Z firmware not "
+                                        "yet loaded\n");
+                        }
+                        return -ENODEV;
+                }
+#ifdef CONFIG_CYZ_INTR
+                else {
+                /* In case this Z board is operating in interrupt mode, its
+                   interrupts should be enabled as soon as the first open
+                   happens to one of its ports. */
+                        if (!cinfo->intr_enabled) {
+                                u16 intr;
+
+                                /* Enable interrupts on the PLX chip */
+                                intr = readw(&cinfo->ctl_addr.p9060->
+                                                intr_ctrl_stat) | 0x0900;
+                                cy_writew(&cinfo->ctl_addr.p9060->
+                                                intr_ctrl_stat, intr);
+                                /* Enable interrupts on the FW */
+                                retval = cyz_issue_cmd(cinfo, 0,
+                                                C_CM_IRQ_ENBL, 0L);
+                                if (retval != 0) {
+                                        printk(KERN_ERR "cyc:IRQ enable retval "
+                                                "was %x\n", retval);
+                                }
+                                cinfo->intr_enabled = 1;
+                        }
+                }
+#endif                          /* CONFIG_CYZ_INTR */
+                /* Make sure this Z port really exists in hardware */
+                if (info->line > (cinfo->first_line + cinfo->nports - 1))
+                        return -ENODEV;
+        }
+#ifdef CY_DEBUG_OTHER
+        printk(KERN_DEBUG "cyc:cy_open ttyC%d\n", info->line);
+#endif
+        tty->driver_data = info;
+        if (serial_paranoia_check(info, tty->name, "cy_open"))
+                return -ENODEV;
+
+#ifdef CY_DEBUG_OPEN
+        printk(KERN_DEBUG "cyc:cy_open ttyC%d, count = %d\n", info->line,
+                        info->port.count);
+#endif
+        info->port.count++;
+#ifdef CY_DEBUG_COUNT
+        printk(KERN_DEBUG "cyc:cy_open (%d): incrementing count to %d\n",
+                current->pid, info->port.count);
+#endif
+
+        /*
+         * If the port is the middle of closing, bail out now
+         */
+        if (tty_hung_up_p(filp) || (info->port.flags & ASYNC_CLOSING)) {
+                wait_event_interruptible_tty(info->port.close_wait,
+                                !(info->port.flags & ASYNC_CLOSING));
+                return (info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN: -ERESTARTSYS;
+        }
+
+        /*
+         * Start up serial port
+         */
+        retval = cy_startup(info, tty);
+        if (retval)
+                return retval;
+
+        retval = tty_port_block_til_ready(&info->port, tty, filp);
+        if (retval) {
+#ifdef CY_DEBUG_OPEN
+                printk(KERN_DEBUG "cyc:cy_open returning after block_til_ready "
+                        "with %d\n", retval);
+#endif
+                return retval;
+        }
+
+        info->throttle = 0;
+        tty_port_tty_set(&info->port, tty);
+
+#ifdef CY_DEBUG_OPEN
+        printk(KERN_DEBUG "cyc:cy_open done\n");
+#endif
+        return 0;
+}                               /* cy_open */
+
+/*
+ * cy_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void cy_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        struct cyclades_card *card;
+        struct cyclades_port *info = tty->driver_data;
+        unsigned long orig_jiffies;
+        int char_time;
+
+        if (serial_paranoia_check(info, tty->name, "cy_wait_until_sent"))
+                return;
+
+        if (info->xmit_fifo_size == 0)
+                return;         /* Just in case.... */
+
+        orig_jiffies = jiffies;
+        /*
+         * Set the check interval to be 1/5 of the estimated time to
+         * send a single character, and make it at least 1.  The check
+         * interval should also be less than the timeout.
+         *
+         * Note: we have to use pretty tight timings here to satisfy
+         * the NIST-PCTS.
+         */
+        char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
+        char_time = char_time / 5;
+        if (char_time <= 0)
+                char_time = 1;
+        if (timeout < 0)
+                timeout = 0;
+        if (timeout)
+                char_time = min(char_time, timeout);
+        /*
+         * If the transmitter hasn't cleared in twice the approximate
+         * amount of time to send the entire FIFO, it probably won't
+         * ever clear.  This assumes the UART isn't doing flow
+         * control, which is currently the case.  Hence, if it ever
+         * takes longer than info->timeout, this is probably due to a
+         * UART bug of some kind.  So, we clamp the timeout parameter at
+         * 2*info->timeout.
+         */
+        if (!timeout || timeout > 2 * info->timeout)
+                timeout = 2 * info->timeout;
+#ifdef CY_DEBUG_WAIT_UNTIL_SENT
+        printk(KERN_DEBUG "In cy_wait_until_sent(%d) check=%d, jiff=%lu...",
+                timeout, char_time, jiffies);
+#endif
+        card = info->card;
+        if (!cy_is_Z(card)) {
+                while (cyy_readb(info, CySRER) & CyTxRdy) {
+#ifdef CY_DEBUG_WAIT_UNTIL_SENT
+                        printk(KERN_DEBUG "Not clean (jiff=%lu)...", jiffies);
+#endif
+                        if (msleep_interruptible(jiffies_to_msecs(char_time)))
+                                break;
+                        if (timeout && time_after(jiffies, orig_jiffies +
+                                        timeout))
+                                break;
+                }
+        }
+        /* Run one more char cycle */
+        msleep_interruptible(jiffies_to_msecs(char_time * 5));
+#ifdef CY_DEBUG_WAIT_UNTIL_SENT
+        printk(KERN_DEBUG "Clean (jiff=%lu)...done\n", jiffies);
+#endif
+}
+
+static void cy_flush_buffer(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_card *card;
+        int channel, retval;
+        unsigned long flags;
+
+#ifdef CY_DEBUG_IO
+        printk(KERN_DEBUG "cyc:cy_flush_buffer ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_flush_buffer"))
+                return;
+
+        card = info->card;
+        channel = info->line - card->first_line;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+        spin_unlock_irqrestore(&card->card_lock, flags);
+
+        if (cy_is_Z(card)) {    /* If it is a Z card, flush the on-board
+                                           buffers as well */
+                spin_lock_irqsave(&card->card_lock, flags);
+                retval = cyz_issue_cmd(card, channel, C_CM_FLUSH_TX, 0L);
+                if (retval != 0) {
+                        printk(KERN_ERR "cyc: flush_buffer retval on ttyC%d "
+                                "was %x\n", info->line, retval);
+                }
+                spin_unlock_irqrestore(&card->card_lock, flags);
+        }
+        tty_wakeup(tty);
+}                               /* cy_flush_buffer */
+
+
+static void cy_do_close(struct tty_port *port)
+{
+        struct cyclades_port *info = container_of(port, struct cyclades_port,
+                                                                port);
+        struct cyclades_card *card;
+        unsigned long flags;
+        int channel;
+
+        card = info->card;
+        channel = info->line - card->first_line;
+        spin_lock_irqsave(&card->card_lock, flags);
+
+        if (!cy_is_Z(card)) {
+                /* Stop accepting input */
+                cyy_writeb(info, CyCAR, channel & 0x03);
+                cyy_writeb(info, CySRER, cyy_readb(info, CySRER) & ~CyRxData);
+                if (info->port.flags & ASYNC_INITIALIZED) {
+                        /* Waiting for on-board buffers to be empty before
+                           closing the port */
+                        spin_unlock_irqrestore(&card->card_lock, flags);
+                        cy_wait_until_sent(port->tty, info->timeout);
+                        spin_lock_irqsave(&card->card_lock, flags);
+                }
+        } else {
+#ifdef Z_WAKE
+                /* Waiting for on-board buffers to be empty before closing
+                   the port */
+                struct CH_CTRL __iomem *ch_ctrl = info->u.cyz.ch_ctrl;
+                int retval;
+
+                if (readl(&ch_ctrl->flow_status) != C_FS_TXIDLE) {
+                        retval = cyz_issue_cmd(card, channel, C_CM_IOCTLW, 0L);
+                        if (retval != 0) {
+                                printk(KERN_DEBUG "cyc:cy_close retval on "
+                                        "ttyC%d was %x\n", info->line, retval);
+                        }
+                        spin_unlock_irqrestore(&card->card_lock, flags);
+                        wait_for_completion_interruptible(&info->shutdown_wait);
+                        spin_lock_irqsave(&card->card_lock, flags);
+                }
+#endif
+        }
+        spin_unlock_irqrestore(&card->card_lock, flags);
+        cy_shutdown(info, port->tty);
+}
+
+/*
+ * This routine is called when a particular tty device is closed.
+ */
+static void cy_close(struct tty_struct *tty, struct file *filp)
+{
+        struct cyclades_port *info = tty->driver_data;
+        if (!info || serial_paranoia_check(info, tty->name, "cy_close"))
+                return;
+        tty_port_close(&info->port, tty, filp);
+}                               /* cy_close */
+
+/* This routine gets called when tty_write has put something into
+ * the write_queue.  The characters may come from user space or
+ * kernel space.
+ *
+ * This routine will return the number of characters actually
+ * accepted for writing.
+ *
+ * If the port is not already transmitting stuff, start it off by
+ * enabling interrupts.  The interrupt service routine will then
+ * ensure that the characters are sent.
+ * If the port is already active, there is no need to kick it.
+ *
+ */
+static int cy_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+        struct cyclades_port *info = tty->driver_data;
+        unsigned long flags;
+        int c, ret = 0;
+
+#ifdef CY_DEBUG_IO
+        printk(KERN_DEBUG "cyc:cy_write ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_write"))
+                return 0;
+
+        if (!info->port.xmit_buf)
+                return 0;
+
+        spin_lock_irqsave(&info->card->card_lock, flags);
+        while (1) {
+                c = min(count, (int)(SERIAL_XMIT_SIZE - info->xmit_cnt - 1));
+                c = min(c, (int)(SERIAL_XMIT_SIZE - info->xmit_head));
+
+                if (c <= 0)
+                        break;
+
+                memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
+                info->xmit_head = (info->xmit_head + c) &
+                        (SERIAL_XMIT_SIZE - 1);
+                info->xmit_cnt += c;
+                buf += c;
+                count -= c;
+                ret += c;
+        }
+        spin_unlock_irqrestore(&info->card->card_lock, flags);
+
+        info->idle_stats.xmit_bytes += ret;
+        info->idle_stats.xmit_idle = jiffies;
+
+        if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped)
+                start_xmit(info);
+
+        return ret;
+}                               /* cy_write */
+
+/*
+ * This routine is called by the kernel to write a single
+ * character to the tty device.  If the kernel uses this routine,
+ * it must call the flush_chars() routine (if defined) when it is
+ * done stuffing characters into the driver.  If there is no room
+ * in the queue, the character is ignored.
+ */
+static int cy_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct cyclades_port *info = tty->driver_data;
+        unsigned long flags;
+
+#ifdef CY_DEBUG_IO
+        printk(KERN_DEBUG "cyc:cy_put_char ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_put_char"))
+                return 0;
+
+        if (!info->port.xmit_buf)
+                return 0;
+
+        spin_lock_irqsave(&info->card->card_lock, flags);
+        if (info->xmit_cnt >= (int)(SERIAL_XMIT_SIZE - 1)) {
+                spin_unlock_irqrestore(&info->card->card_lock, flags);
+                return 0;
+        }
+
+        info->port.xmit_buf[info->xmit_head++] = ch;
+        info->xmit_head &= SERIAL_XMIT_SIZE - 1;
+        info->xmit_cnt++;
+        info->idle_stats.xmit_bytes++;
+        info->idle_stats.xmit_idle = jiffies;
+        spin_unlock_irqrestore(&info->card->card_lock, flags);
+        return 1;
+}                               /* cy_put_char */
+
+/*
+ * This routine is called by the kernel after it has written a
+ * series of characters to the tty device using put_char().
+ */
+static void cy_flush_chars(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+
+#ifdef CY_DEBUG_IO
+        printk(KERN_DEBUG "cyc:cy_flush_chars ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_flush_chars"))
+                return;
+
+        if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+                        !info->port.xmit_buf)
+                return;
+
+        start_xmit(info);
+}                               /* cy_flush_chars */
+
+/*
+ * This routine returns the numbers of characters the tty driver
+ * will accept for queuing to be written.  This number is subject
+ * to change as output buffers get emptied, or if the output flow
+ * control is activated.
+ */
+static int cy_write_room(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+        int ret;
+
+#ifdef CY_DEBUG_IO
+        printk(KERN_DEBUG "cyc:cy_write_room ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_write_room"))
+                return 0;
+        ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+        if (ret < 0)
+                ret = 0;
+        return ret;
+}                               /* cy_write_room */
+
+static int cy_chars_in_buffer(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "cy_chars_in_buffer"))
+                return 0;
+
+#ifdef Z_EXT_CHARS_IN_BUFFER
+        if (!cy_is_Z(info->card)) {
+#endif                          /* Z_EXT_CHARS_IN_BUFFER */
+#ifdef CY_DEBUG_IO
+                printk(KERN_DEBUG "cyc:cy_chars_in_buffer ttyC%d %d\n",
+                        info->line, info->xmit_cnt);
+#endif
+                return info->xmit_cnt;
+#ifdef Z_EXT_CHARS_IN_BUFFER
+        } else {
+                struct BUF_CTRL __iomem *buf_ctrl = info->u.cyz.buf_ctrl;
+                int char_count;
+                __u32 tx_put, tx_get, tx_bufsize;
+
+                tx_get = readl(&buf_ctrl->tx_get);
+                tx_put = readl(&buf_ctrl->tx_put);
+                tx_bufsize = readl(&buf_ctrl->tx_bufsize);
+                if (tx_put >= tx_get)
+                        char_count = tx_put - tx_get;
+                else
+                        char_count = tx_put - tx_get + tx_bufsize;
+#ifdef CY_DEBUG_IO
+                printk(KERN_DEBUG "cyc:cy_chars_in_buffer ttyC%d %d\n",
+                        info->line, info->xmit_cnt + char_count);
+#endif
+                return info->xmit_cnt + char_count;
+        }
+#endif                          /* Z_EXT_CHARS_IN_BUFFER */
+}                               /* cy_chars_in_buffer */
+
+/*
+ * ------------------------------------------------------------
+ * cy_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static void cyy_baud_calc(struct cyclades_port *info, __u32 baud)
+{
+        int co, co_val, bpr;
+        __u32 cy_clock = ((info->chip_rev >= CD1400_REV_J) ? 60000000 :
+                        25000000);
+
+        if (baud == 0) {
+                info->tbpr = info->tco = info->rbpr = info->rco = 0;
+                return;
+        }
+
+        /* determine which prescaler to use */
+        for (co = 4, co_val = 2048; co; co--, co_val >>= 2) {
+                if (cy_clock / co_val / baud > 63)
+                        break;
+        }
+
+        bpr = (cy_clock / co_val * 2 / baud + 1) / 2;
+        if (bpr > 255)
+                bpr = 255;
+
+        info->tbpr = info->rbpr = bpr;
+        info->tco = info->rco = co;
+}
+
+/*
+ * This routine finds or computes the various line characteristics.
+ * It used to be called config_setup
+ */
+static void cy_set_line_char(struct cyclades_port *info, struct tty_struct *tty)
+{
+        struct cyclades_card *card;
+        unsigned long flags;
+        int channel;
+        unsigned cflag, iflag;
+        int baud, baud_rate = 0;
+        int i;
+
+        if (!tty->termios) /* XXX can this happen at all? */
+                return;
+
+        if (info->line == -1)
+                return;
+
+        cflag = tty->termios->c_cflag;
+        iflag = tty->termios->c_iflag;
+
+        /*
+         * Set up the tty->alt_speed kludge
+         */
+        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+                tty->alt_speed = 57600;
+        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+                tty->alt_speed = 115200;
+        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+                tty->alt_speed = 230400;
+        if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+                tty->alt_speed = 460800;
+
+        card = info->card;
+        channel = info->line - card->first_line;
+
+        if (!cy_is_Z(card)) {
+                u32 cflags;
+
+                /* baud rate */
+                baud = tty_get_baud_rate(tty);
+                if (baud == 38400 && (info->port.flags & ASYNC_SPD_MASK) ==
+                                ASYNC_SPD_CUST) {
+                        if (info->custom_divisor)
+                                baud_rate = info->baud / info->custom_divisor;
+                        else
+                                baud_rate = info->baud;
+                } else if (baud > CD1400_MAX_SPEED) {
+                        baud = CD1400_MAX_SPEED;
+                }
+                /* find the baud index */
+                for (i = 0; i < 20; i++) {
+                        if (baud == baud_table[i])
+                                break;
+                }
+                if (i == 20)
+                        i = 19; /* CD1400_MAX_SPEED */
+
+                if (baud == 38400 && (info->port.flags & ASYNC_SPD_MASK) ==
+                                ASYNC_SPD_CUST) {
+                        cyy_baud_calc(info, baud_rate);
+                } else {
+                        if (info->chip_rev >= CD1400_REV_J) {
+                                /* It is a CD1400 rev. J or later */
+                                info->tbpr = baud_bpr_60[i];    /* Tx BPR */
+                                info->tco = baud_co_60[i];      /* Tx CO */
+                                info->rbpr = baud_bpr_60[i];    /* Rx BPR */
+                                info->rco = baud_co_60[i];      /* Rx CO */
+                        } else {
+                                info->tbpr = baud_bpr_25[i];    /* Tx BPR */
+                                info->tco = baud_co_25[i];      /* Tx CO */
+                                info->rbpr = baud_bpr_25[i];    /* Rx BPR */
+                                info->rco = baud_co_25[i];      /* Rx CO */
+                        }
+                }
+                if (baud_table[i] == 134) {
+                        /* get it right for 134.5 baud */
+                        info->timeout = (info->xmit_fifo_size * HZ * 30 / 269) +
+                                        2;
+                } else if (baud == 38400 && (info->port.flags & ASYNC_SPD_MASK) ==
+                                ASYNC_SPD_CUST) {
+                        info->timeout = (info->xmit_fifo_size * HZ * 15 /
+                                        baud_rate) + 2;
+                } else if (baud_table[i]) {
+                        info->timeout = (info->xmit_fifo_size * HZ * 15 /
+                                        baud_table[i]) + 2;
+                        /* this needs to be propagated into the card info */
+                } else {
+                        info->timeout = 0;
+                }
+                /* By tradition (is it a standard?) a baud rate of zero
+                   implies the line should be/has been closed.  A bit
+                   later in this routine such a test is performed. */
+
+                /* byte size and parity */
+                info->cor5 = 0;
+                info->cor4 = 0;
+                /* receive threshold */
+                info->cor3 = (info->default_threshold ?
+                                info->default_threshold : baud_cor3[i]);
+                info->cor2 = CyETC;
+                switch (cflag & CSIZE) {
+                case CS5:
+                        info->cor1 = Cy_5_BITS;
+                        break;
+                case CS6:
+                        info->cor1 = Cy_6_BITS;
+                        break;
+                case CS7:
+                        info->cor1 = Cy_7_BITS;
+                        break;
+                case CS8:
+                        info->cor1 = Cy_8_BITS;
+                        break;
+                }
+                if (cflag & CSTOPB)
+                        info->cor1 |= Cy_2_STOP;
+
+                if (cflag & PARENB) {
+                        if (cflag & PARODD)
+                                info->cor1 |= CyPARITY_O;
+                        else
+                                info->cor1 |= CyPARITY_E;
+                } else
+                        info->cor1 |= CyPARITY_NONE;
+
+                /* CTS flow control flag */
+                if (cflag & CRTSCTS) {
+                        info->port.flags |= ASYNC_CTS_FLOW;
+                        info->cor2 |= CyCtsAE;
+                } else {
+                        info->port.flags &= ~ASYNC_CTS_FLOW;
+                        info->cor2 &= ~CyCtsAE;
+                }
+                if (cflag & CLOCAL)
+                        info->port.flags &= ~ASYNC_CHECK_CD;
+                else
+                        info->port.flags |= ASYNC_CHECK_CD;
+
+         /***********************************************
+            The hardware option, CyRtsAO, presents RTS when
+            the chip has characters to send.  Since most modems
+            use RTS as reverse (inbound) flow control, this
+            option is not used.  If inbound flow control is
+            necessary, DTR can be programmed to provide the
+            appropriate signals for use with a non-standard
+            cable.  Contact Marcio Saito for details.
+         ***********************************************/
+
+                channel &= 0x03;
+
+                spin_lock_irqsave(&card->card_lock, flags);
+                cyy_writeb(info, CyCAR, channel);
+
+                /* tx and rx baud rate */
+
+                cyy_writeb(info, CyTCOR, info->tco);
+                cyy_writeb(info, CyTBPR, info->tbpr);
+                cyy_writeb(info, CyRCOR, info->rco);
+                cyy_writeb(info, CyRBPR, info->rbpr);
+
+                /* set line characteristics  according configuration */
+
+                cyy_writeb(info, CySCHR1, START_CHAR(tty));
+                cyy_writeb(info, CySCHR2, STOP_CHAR(tty));
+                cyy_writeb(info, CyCOR1, info->cor1);
+                cyy_writeb(info, CyCOR2, info->cor2);
+                cyy_writeb(info, CyCOR3, info->cor3);
+                cyy_writeb(info, CyCOR4, info->cor4);
+                cyy_writeb(info, CyCOR5, info->cor5);
+
+                cyy_issue_cmd(info, CyCOR_CHANGE | CyCOR1ch | CyCOR2ch |
+                                CyCOR3ch);
+
+                /* !!! Is this needed? */
+                cyy_writeb(info, CyCAR, channel);
+                cyy_writeb(info, CyRTPR,
+                        (info->default_timeout ? info->default_timeout : 0x02));
+                /* 10ms rx timeout */
+
+                cflags = CyCTS;
+                if (!C_CLOCAL(tty))
+                        cflags |= CyDSR | CyRI | CyDCD;
+                /* without modem intr */
+                cyy_writeb(info, CySRER, cyy_readb(info, CySRER) | CyMdmCh);
+                /* act on 1->0 modem transitions */
+                if ((cflag & CRTSCTS) && info->rflow)
+                        cyy_writeb(info, CyMCOR1, cflags | rflow_thr[i]);
+                else
+                        cyy_writeb(info, CyMCOR1, cflags);
+                /* act on 0->1 modem transitions */
+                cyy_writeb(info, CyMCOR2, cflags);
+
+                if (i == 0)     /* baud rate is zero, turn off line */
+                        cyy_change_rts_dtr(info, 0, TIOCM_DTR);
+                else
+                        cyy_change_rts_dtr(info, TIOCM_DTR, 0);
+
+                clear_bit(TTY_IO_ERROR, &tty->flags);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+
+        } else {
+                struct CH_CTRL __iomem *ch_ctrl = info->u.cyz.ch_ctrl;
+                __u32 sw_flow;
+                int retval;
+
+                if (!cyz_is_loaded(card))
+                        return;
+
+                /* baud rate */
+                baud = tty_get_baud_rate(tty);
+                if (baud == 38400 && (info->port.flags & ASYNC_SPD_MASK) ==
+                                ASYNC_SPD_CUST) {
+                        if (info->custom_divisor)
+                                baud_rate = info->baud / info->custom_divisor;
+                        else
+                                baud_rate = info->baud;
+                } else if (baud > CYZ_MAX_SPEED) {
+                        baud = CYZ_MAX_SPEED;
+                }
+                cy_writel(&ch_ctrl->comm_baud, baud);
+
+                if (baud == 134) {
+                        /* get it right for 134.5 baud */
+                        info->timeout = (info->xmit_fifo_size * HZ * 30 / 269) +
+                                        2;
+                } else if (baud == 38400 && (info->port.flags & ASYNC_SPD_MASK) ==
+                                ASYNC_SPD_CUST) {
+                        info->timeout = (info->xmit_fifo_size * HZ * 15 /
+                                        baud_rate) + 2;
+                } else if (baud) {
+                        info->timeout = (info->xmit_fifo_size * HZ * 15 /
+                                        baud) + 2;
+                        /* this needs to be propagated into the card info */
+                } else {
+                        info->timeout = 0;
+                }
+
+                /* byte size and parity */
+                switch (cflag & CSIZE) {
+                case CS5:
+                        cy_writel(&ch_ctrl->comm_data_l, C_DL_CS5);
+                        break;
+                case CS6:
+                        cy_writel(&ch_ctrl->comm_data_l, C_DL_CS6);
+                        break;
+                case CS7:
+                        cy_writel(&ch_ctrl->comm_data_l, C_DL_CS7);
+                        break;
+                case CS8:
+                        cy_writel(&ch_ctrl->comm_data_l, C_DL_CS8);
+                        break;
+                }
+                if (cflag & CSTOPB) {
+                        cy_writel(&ch_ctrl->comm_data_l,
+                                  readl(&ch_ctrl->comm_data_l) | C_DL_2STOP);
+                } else {
+                        cy_writel(&ch_ctrl->comm_data_l,
+                                  readl(&ch_ctrl->comm_data_l) | C_DL_1STOP);
+                }
+                if (cflag & PARENB) {
+                        if (cflag & PARODD)
+                                cy_writel(&ch_ctrl->comm_parity, C_PR_ODD);
+                        else
+                                cy_writel(&ch_ctrl->comm_parity, C_PR_EVEN);
+                } else
+                        cy_writel(&ch_ctrl->comm_parity, C_PR_NONE);
+
+                /* CTS flow control flag */
+                if (cflag & CRTSCTS) {
+                        cy_writel(&ch_ctrl->hw_flow,
+                                readl(&ch_ctrl->hw_flow) | C_RS_CTS | C_RS_RTS);
+                } else {
+                        cy_writel(&ch_ctrl->hw_flow, readl(&ch_ctrl->hw_flow) &
+                                        ~(C_RS_CTS | C_RS_RTS));
+                }
+                /* As the HW flow control is done in firmware, the driver
+                   doesn't need to care about it */
+                info->port.flags &= ~ASYNC_CTS_FLOW;
+
+                /* XON/XOFF/XANY flow control flags */
+                sw_flow = 0;
+                if (iflag & IXON) {
+                        sw_flow |= C_FL_OXX;
+                        if (iflag & IXANY)
+                                sw_flow |= C_FL_OIXANY;
+                }
+                cy_writel(&ch_ctrl->sw_flow, sw_flow);
+
+                retval = cyz_issue_cmd(card, channel, C_CM_IOCTL, 0L);
+                if (retval != 0) {
+                        printk(KERN_ERR "cyc:set_line_char retval on ttyC%d "
+                                "was %x\n", info->line, retval);
+                }
+
+                /* CD sensitivity */
+                if (cflag & CLOCAL)
+                        info->port.flags &= ~ASYNC_CHECK_CD;
+                else
+                        info->port.flags |= ASYNC_CHECK_CD;
+
+                if (baud == 0) {        /* baud rate is zero, turn off line */
+                        cy_writel(&ch_ctrl->rs_control,
+                                  readl(&ch_ctrl->rs_control) & ~C_RS_DTR);
+#ifdef CY_DEBUG_DTR
+                        printk(KERN_DEBUG "cyc:set_line_char dropping Z DTR\n");
+#endif
+                } else {
+                        cy_writel(&ch_ctrl->rs_control,
+                                  readl(&ch_ctrl->rs_control) | C_RS_DTR);
+#ifdef CY_DEBUG_DTR
+                        printk(KERN_DEBUG "cyc:set_line_char raising Z DTR\n");
+#endif
+                }
+
+                retval = cyz_issue_cmd(card, channel, C_CM_IOCTLM, 0L);
+                if (retval != 0) {
+                        printk(KERN_ERR "cyc:set_line_char(2) retval on ttyC%d "
+                                "was %x\n", info->line, retval);
+                }
+
+                clear_bit(TTY_IO_ERROR, &tty->flags);
+        }
+}                               /* set_line_char */
+
+static int cy_get_serial_info(struct cyclades_port *info,
+                struct serial_struct __user *retinfo)
+{
+        struct cyclades_card *cinfo = info->card;
+        struct serial_struct tmp = {
+                .type = info->type,
+                .line = info->line,
+                .port = (info->card - cy_card) * 0x100 + info->line -
+                        cinfo->first_line,
+                .irq = cinfo->irq,
+                .flags = info->port.flags,
+                .close_delay = info->port.close_delay,
+                .closing_wait = info->port.closing_wait,
+                .baud_base = info->baud,
+                .custom_divisor = info->custom_divisor,
+                .hub6 = 0,              /*!!! */
+        };
+        return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
+}
+
+static int
+cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
+                struct serial_struct __user *new_info)
+{
+        struct serial_struct new_serial;
+        int ret;
+
+        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+                return -EFAULT;
+
+        mutex_lock(&info->port.mutex);
+        if (!capable(CAP_SYS_ADMIN)) {
+                if (new_serial.close_delay != info->port.close_delay ||
+                                new_serial.baud_base != info->baud ||
+                                (new_serial.flags & ASYNC_FLAGS &
+                                        ~ASYNC_USR_MASK) !=
+                                (info->port.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK))
+                {
+                        mutex_unlock(&info->port.mutex);
+                        return -EPERM;
+                }
+                info->port.flags = (info->port.flags & ~ASYNC_USR_MASK) |
+                                (new_serial.flags & ASYNC_USR_MASK);
+                info->baud = new_serial.baud_base;
+                info->custom_divisor = new_serial.custom_divisor;
+                goto check_and_exit;
+        }
+
+        /*
+         * OK, past this point, all the error checking has been done.
+         * At this point, we start making changes.....
+         */
+
+        info->baud = new_serial.baud_base;
+        info->custom_divisor = new_serial.custom_divisor;
+        info->port.flags = (info->port.flags & ~ASYNC_FLAGS) |
+                        (new_serial.flags & ASYNC_FLAGS);
+        info->port.close_delay = new_serial.close_delay * HZ / 100;
+        info->port.closing_wait = new_serial.closing_wait * HZ / 100;
+
+check_and_exit:
+        if (info->port.flags & ASYNC_INITIALIZED) {
+                cy_set_line_char(info, tty);
+                ret = 0;
+        } else {
+                ret = cy_startup(info, tty);
+        }
+        mutex_unlock(&info->port.mutex);
+        return ret;
+}                               /* set_serial_info */
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space.
+ */
+static int get_lsr_info(struct cyclades_port *info, unsigned int __user *value)
+{
+        struct cyclades_card *card = info->card;
+        unsigned int result;
+        unsigned long flags;
+        u8 status;
+
+        if (!cy_is_Z(card)) {
+                spin_lock_irqsave(&card->card_lock, flags);
+                status = cyy_readb(info, CySRER) & (CyTxRdy | CyTxMpty);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+                result = (status ? 0 : TIOCSER_TEMT);
+        } else {
+                /* Not supported yet */
+                return -EINVAL;
+        }
+        return put_user(result, (unsigned long __user *)value);
+}
+
+static int cy_tiocmget(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_card *card;
+        int result;
+
+        if (serial_paranoia_check(info, tty->name, __func__))
+                return -ENODEV;
+
+        card = info->card;
+
+        if (!cy_is_Z(card)) {
+                unsigned long flags;
+                int channel = info->line - card->first_line;
+                u8 status;
+
+                spin_lock_irqsave(&card->card_lock, flags);
+                cyy_writeb(info, CyCAR, channel & 0x03);
+                status = cyy_readb(info, CyMSVR1);
+                status |= cyy_readb(info, CyMSVR2);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+
+                if (info->rtsdtr_inv) {
+                        result = ((status & CyRTS) ? TIOCM_DTR : 0) |
+                                ((status & CyDTR) ? TIOCM_RTS : 0);
+                } else {
+                        result = ((status & CyRTS) ? TIOCM_RTS : 0) |
+                                ((status & CyDTR) ? TIOCM_DTR : 0);
+                }
+                result |= ((status & CyDCD) ? TIOCM_CAR : 0) |
+                        ((status & CyRI) ? TIOCM_RNG : 0) |
+                        ((status & CyDSR) ? TIOCM_DSR : 0) |
+                        ((status & CyCTS) ? TIOCM_CTS : 0);
+        } else {
+                u32 lstatus;
+
+                if (!cyz_is_loaded(card)) {
+                        result = -ENODEV;
+                        goto end;
+                }
+
+                lstatus = readl(&info->u.cyz.ch_ctrl->rs_status);
+                result = ((lstatus & C_RS_RTS) ? TIOCM_RTS : 0) |
+                        ((lstatus & C_RS_DTR) ? TIOCM_DTR : 0) |
+                        ((lstatus & C_RS_DCD) ? TIOCM_CAR : 0) |
+                        ((lstatus & C_RS_RI) ? TIOCM_RNG : 0) |
+                        ((lstatus & C_RS_DSR) ? TIOCM_DSR : 0) |
+                        ((lstatus & C_RS_CTS) ? TIOCM_CTS : 0);
+        }
+end:
+        return result;
+}                               /* cy_tiomget */
+
+static int
+cy_tiocmset(struct tty_struct *tty,
+                unsigned int set, unsigned int clear)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_card *card;
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, __func__))
+                return -ENODEV;
+
+        card = info->card;
+        if (!cy_is_Z(card)) {
+                spin_lock_irqsave(&card->card_lock, flags);
+                cyy_change_rts_dtr(info, set, clear);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+        } else {
+                struct CH_CTRL __iomem *ch_ctrl = info->u.cyz.ch_ctrl;
+                int retval, channel = info->line - card->first_line;
+                u32 rs;
+
+                if (!cyz_is_loaded(card))
+                        return -ENODEV;
+
+                spin_lock_irqsave(&card->card_lock, flags);
+                rs = readl(&ch_ctrl->rs_control);
+                if (set & TIOCM_RTS)
+                        rs |= C_RS_RTS;
+                if (clear & TIOCM_RTS)
+                        rs &= ~C_RS_RTS;
+                if (set & TIOCM_DTR) {
+                        rs |= C_RS_DTR;
+#ifdef CY_DEBUG_DTR
+                        printk(KERN_DEBUG "cyc:set_modem_info raising Z DTR\n");
+#endif
+                }
+                if (clear & TIOCM_DTR) {
+                        rs &= ~C_RS_DTR;
+#ifdef CY_DEBUG_DTR
+                        printk(KERN_DEBUG "cyc:set_modem_info clearing "
+                                "Z DTR\n");
+#endif
+                }
+                cy_writel(&ch_ctrl->rs_control, rs);
+                retval = cyz_issue_cmd(card, channel, C_CM_IOCTLM, 0L);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+                if (retval != 0) {
+                        printk(KERN_ERR "cyc:set_modem_info retval on ttyC%d "
+                                "was %x\n", info->line, retval);
+                }
+        }
+        return 0;
+}
+
+/*
+ * cy_break() --- routine which turns the break handling on or off
+ */
+static int cy_break(struct tty_struct *tty, int break_state)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_card *card;
+        unsigned long flags;
+        int retval = 0;
+
+        if (serial_paranoia_check(info, tty->name, "cy_break"))
+                return -EINVAL;
+
+        card = info->card;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+        if (!cy_is_Z(card)) {
+                /* Let the transmit ISR take care of this (since it
+                   requires stuffing characters into the output stream).
+                 */
+                if (break_state == -1) {
+                        if (!info->breakon) {
+                                info->breakon = 1;
+                                if (!info->xmit_cnt) {
+                                        spin_unlock_irqrestore(&card->card_lock, flags);
+                                        start_xmit(info);
+                                        spin_lock_irqsave(&card->card_lock, flags);
+                                }
+                        }
+                } else {
+                        if (!info->breakoff) {
+                                info->breakoff = 1;
+                                if (!info->xmit_cnt) {
+                                        spin_unlock_irqrestore(&card->card_lock, flags);
+                                        start_xmit(info);
+                                        spin_lock_irqsave(&card->card_lock, flags);
+                                }
+                        }
+                }
+        } else {
+                if (break_state == -1) {
+                        retval = cyz_issue_cmd(card,
+                                info->line - card->first_line,
+                                C_CM_SET_BREAK, 0L);
+                        if (retval != 0) {
+                                printk(KERN_ERR "cyc:cy_break (set) retval on "
+                                        "ttyC%d was %x\n", info->line, retval);
+                        }
+                } else {
+                        retval = cyz_issue_cmd(card,
+                                info->line - card->first_line,
+                                C_CM_CLR_BREAK, 0L);
+                        if (retval != 0) {
+                                printk(KERN_DEBUG "cyc:cy_break (clr) retval "
+                                        "on ttyC%d was %x\n", info->line,
+                                        retval);
+                        }
+                }
+        }
+        spin_unlock_irqrestore(&card->card_lock, flags);
+        return retval;
+}                               /* cy_break */
+
+static int set_threshold(struct cyclades_port *info, unsigned long value)
+{
+        struct cyclades_card *card = info->card;
+        unsigned long flags;
+
+        if (!cy_is_Z(card)) {
+                info->cor3 &= ~CyREC_FIFO;
+                info->cor3 |= value & CyREC_FIFO;
+
+                spin_lock_irqsave(&card->card_lock, flags);
+                cyy_writeb(info, CyCOR3, info->cor3);
+                cyy_issue_cmd(info, CyCOR_CHANGE | CyCOR3ch);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+        }
+        return 0;
+}                               /* set_threshold */
+
+static int get_threshold(struct cyclades_port *info,
+                                                unsigned long __user *value)
+{
+        struct cyclades_card *card = info->card;
+
+        if (!cy_is_Z(card)) {
+                u8 tmp = cyy_readb(info, CyCOR3) & CyREC_FIFO;
+                return put_user(tmp, value);
+        }
+        return 0;
+}                               /* get_threshold */
+
+static int set_timeout(struct cyclades_port *info, unsigned long value)
+{
+        struct cyclades_card *card = info->card;
+        unsigned long flags;
+
+        if (!cy_is_Z(card)) {
+                spin_lock_irqsave(&card->card_lock, flags);
+                cyy_writeb(info, CyRTPR, value & 0xff);
+                spin_unlock_irqrestore(&card->card_lock, flags);
+        }
+        return 0;
+}                               /* set_timeout */
+
+static int get_timeout(struct cyclades_port *info,
+                                                unsigned long __user *value)
+{
+        struct cyclades_card *card = info->card;
+
+        if (!cy_is_Z(card)) {
+                u8 tmp = cyy_readb(info, CyRTPR);
+                return put_user(tmp, value);
+        }
+        return 0;
+}                               /* get_timeout */
+
+static int cy_cflags_changed(struct cyclades_port *info, unsigned long arg,
+                struct cyclades_icount *cprev)
+{
+        struct cyclades_icount cnow;
+        unsigned long flags;
+        int ret;
+
+        spin_lock_irqsave(&info->card->card_lock, flags);
+        cnow = info->icount;    /* atomic copy */
+        spin_unlock_irqrestore(&info->card->card_lock, flags);
+
+        ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
+                ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
+                ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
+                ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
+
+        *cprev = cnow;
+
+        return ret;
+}
+
+/*
+ * This routine allows the tty driver to implement device-
+ * specific ioctl's.  If the ioctl number passed in cmd is
+ * not recognized by the driver, it should return ENOIOCTLCMD.
+ */
+static int
+cy_ioctl(struct tty_struct *tty,
+         unsigned int cmd, unsigned long arg)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_icount cnow;    /* kernel counter temps */
+        int ret_val = 0;
+        unsigned long flags;
+        void __user *argp = (void __user *)arg;
+
+        if (serial_paranoia_check(info, tty->name, "cy_ioctl"))
+                return -ENODEV;
+
+#ifdef CY_DEBUG_OTHER
+        printk(KERN_DEBUG "cyc:cy_ioctl ttyC%d, cmd = %x arg = %lx\n",
+                info->line, cmd, arg);
+#endif
+
+        switch (cmd) {
+        case CYGETMON:
+                if (copy_to_user(argp, &info->mon, sizeof(info->mon))) {
+                        ret_val = -EFAULT;
+                        break;
+                }
+                memset(&info->mon, 0, sizeof(info->mon));
+                break;
+        case CYGETTHRESH:
+                ret_val = get_threshold(info, argp);
+                break;
+        case CYSETTHRESH:
+                ret_val = set_threshold(info, arg);
+                break;
+        case CYGETDEFTHRESH:
+                ret_val = put_user(info->default_threshold,
+                                (unsigned long __user *)argp);
+                break;
+        case CYSETDEFTHRESH:
+                info->default_threshold = arg & 0x0f;
+                break;
+        case CYGETTIMEOUT:
+                ret_val = get_timeout(info, argp);
+                break;
+        case CYSETTIMEOUT:
+                ret_val = set_timeout(info, arg);
+                break;
+        case CYGETDEFTIMEOUT:
+                ret_val = put_user(info->default_timeout,
+                                (unsigned long __user *)argp);
+                break;
+        case CYSETDEFTIMEOUT:
+                info->default_timeout = arg & 0xff;
+                break;
+        case CYSETRFLOW:
+                info->rflow = (int)arg;
+                break;
+        case CYGETRFLOW:
+                ret_val = info->rflow;
+                break;
+        case CYSETRTSDTR_INV:
+                info->rtsdtr_inv = (int)arg;
+                break;
+        case CYGETRTSDTR_INV:
+                ret_val = info->rtsdtr_inv;
+                break;
+        case CYGETCD1400VER:
+                ret_val = info->chip_rev;
+                break;
+#ifndef CONFIG_CYZ_INTR
+        case CYZSETPOLLCYCLE:
+                cyz_polling_cycle = (arg * HZ) / 1000;
+                break;
+        case CYZGETPOLLCYCLE:
+                ret_val = (cyz_polling_cycle * 1000) / HZ;
+                break;
+#endif                          /* CONFIG_CYZ_INTR */
+        case CYSETWAIT:
+                info->port.closing_wait = (unsigned short)arg * HZ / 100;
+                break;
+        case CYGETWAIT:
+                ret_val = info->port.closing_wait / (HZ / 100);
+                break;
+        case TIOCGSERIAL:
+                ret_val = cy_get_serial_info(info, argp);
+                break;
+        case TIOCSSERIAL:
+                ret_val = cy_set_serial_info(info, tty, argp);
+                break;
+        case TIOCSERGETLSR:     /* Get line status register */
+                ret_val = get_lsr_info(info, argp);
+                break;
+                /*
+                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+                 * - mask passed in arg for lines of interest
+                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+                 * Caller should use TIOCGICOUNT to see which one it was
+                 */
+        case TIOCMIWAIT:
+                spin_lock_irqsave(&info->card->card_lock, flags);
+                /* note the counters on entry */
+                cnow = info->icount;
+                spin_unlock_irqrestore(&info->card->card_lock, flags);
+                ret_val = wait_event_interruptible(info->port.delta_msr_wait,
+                                cy_cflags_changed(info, arg, &cnow));
+                break;
+
+                /*
+                 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+                 * Return: write counters to the user passed counter struct
+                 * NB: both 1->0 and 0->1 transitions are counted except for
+                 *     RI where only 0->1 is counted.
+                 */
+        default:
+                ret_val = -ENOIOCTLCMD;
+        }
+
+#ifdef CY_DEBUG_OTHER
+        printk(KERN_DEBUG "cyc:cy_ioctl done\n");
+#endif
+        return ret_val;
+}                               /* cy_ioctl */
+
+static int cy_get_icount(struct tty_struct *tty,
+                                struct serial_icounter_struct *sic)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_icount cnow;    /* Used to snapshot */
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->card->card_lock, flags);
+        cnow = info->icount;
+        spin_unlock_irqrestore(&info->card->card_lock, flags);
+
+        sic->cts = cnow.cts;
+        sic->dsr = cnow.dsr;
+        sic->rng = cnow.rng;
+        sic->dcd = cnow.dcd;
+        sic->rx = cnow.rx;
+        sic->tx = cnow.tx;
+        sic->frame = cnow.frame;
+        sic->overrun = cnow.overrun;
+        sic->parity = cnow.parity;
+        sic->brk = cnow.brk;
+        sic->buf_overrun = cnow.buf_overrun;
+        return 0;
+}
+
+/*
+ * This routine allows the tty driver to be notified when
+ * device's termios settings have changed.  Note that a
+ * well-designed tty driver should be prepared to accept the case
+ * where old == NULL, and try to do something rational.
+ */
+static void cy_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        struct cyclades_port *info = tty->driver_data;
+
+#ifdef CY_DEBUG_OTHER
+        printk(KERN_DEBUG "cyc:cy_set_termios ttyC%d\n", info->line);
+#endif
+
+        cy_set_line_char(info, tty);
+
+        if ((old_termios->c_cflag & CRTSCTS) &&
+                        !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                cy_start(tty);
+        }
+#if 0
+        /*
+         * No need to wake up processes in open wait, since they
+         * sample the CLOCAL flag once, and don't recheck it.
+         * XXX  It's not clear whether the current behavior is correct
+         * or not.  Hence, this may change.....
+         */
+        if (!(old_termios->c_cflag & CLOCAL) &&
+            (tty->termios->c_cflag & CLOCAL))
+                wake_up_interruptible(&info->port.open_wait);
+#endif
+}                               /* cy_set_termios */
+
+/* This function is used to send a high-priority XON/XOFF character to
+   the device.
+*/
+static void cy_send_xchar(struct tty_struct *tty, char ch)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_card *card;
+        int channel;
+
+        if (serial_paranoia_check(info, tty->name, "cy_send_xchar"))
+                return;
+
+        info->x_char = ch;
+
+        if (ch)
+                cy_start(tty);
+
+        card = info->card;
+        channel = info->line - card->first_line;
+
+        if (cy_is_Z(card)) {
+                if (ch == STOP_CHAR(tty))
+                        cyz_issue_cmd(card, channel, C_CM_SENDXOFF, 0L);
+                else if (ch == START_CHAR(tty))
+                        cyz_issue_cmd(card, channel, C_CM_SENDXON, 0L);
+        }
+}
+
+/* This routine is called by the upper-layer tty layer to signal
+   that incoming characters should be throttled because the input
+   buffers are close to full.
+ */
+static void cy_throttle(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_card *card;
+        unsigned long flags;
+
+#ifdef CY_DEBUG_THROTTLE
+        char buf[64];
+
+        printk(KERN_DEBUG "cyc:throttle %s: %ld...ttyC%d\n", tty_name(tty, buf),
+                        tty->ldisc.chars_in_buffer(tty), info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_throttle"))
+                return;
+
+        card = info->card;
+
+        if (I_IXOFF(tty)) {
+                if (!cy_is_Z(card))
+                        cy_send_xchar(tty, STOP_CHAR(tty));
+                else
+                        info->throttle = 1;
+        }
+
+        if (tty->termios->c_cflag & CRTSCTS) {
+                if (!cy_is_Z(card)) {
+                        spin_lock_irqsave(&card->card_lock, flags);
+                        cyy_change_rts_dtr(info, 0, TIOCM_RTS);
+                        spin_unlock_irqrestore(&card->card_lock, flags);
+                } else {
+                        info->throttle = 1;
+                }
+        }
+}                               /* cy_throttle */
+
+/*
+ * This routine notifies the tty driver that it should signal
+ * that characters can now be sent to the tty without fear of
+ * overrunning the input buffers of the line disciplines.
+ */
+static void cy_unthrottle(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+        struct cyclades_card *card;
+        unsigned long flags;
+
+#ifdef CY_DEBUG_THROTTLE
+        char buf[64];
+
+        printk(KERN_DEBUG "cyc:unthrottle %s: %ld...ttyC%d\n",
+                tty_name(tty, buf), tty_chars_in_buffer(tty), info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_unthrottle"))
+                return;
+
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        cy_send_xchar(tty, START_CHAR(tty));
+        }
+
+        if (tty->termios->c_cflag & CRTSCTS) {
+                card = info->card;
+                if (!cy_is_Z(card)) {
+                        spin_lock_irqsave(&card->card_lock, flags);
+                        cyy_change_rts_dtr(info, TIOCM_RTS, 0);
+                        spin_unlock_irqrestore(&card->card_lock, flags);
+                } else {
+                        info->throttle = 0;
+                }
+        }
+}                               /* cy_unthrottle */
+
+/* cy_start and cy_stop provide software output flow control as a
+   function of XON/XOFF, software CTS, and other such stuff.
+*/
+static void cy_stop(struct tty_struct *tty)
+{
+        struct cyclades_card *cinfo;
+        struct cyclades_port *info = tty->driver_data;
+        int channel;
+        unsigned long flags;
+
+#ifdef CY_DEBUG_OTHER
+        printk(KERN_DEBUG "cyc:cy_stop ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_stop"))
+                return;
+
+        cinfo = info->card;
+        channel = info->line - cinfo->first_line;
+        if (!cy_is_Z(cinfo)) {
+                spin_lock_irqsave(&cinfo->card_lock, flags);
+                cyy_writeb(info, CyCAR, channel & 0x03);
+                cyy_writeb(info, CySRER, cyy_readb(info, CySRER) & ~CyTxRdy);
+                spin_unlock_irqrestore(&cinfo->card_lock, flags);
+        }
+}                               /* cy_stop */
+
+static void cy_start(struct tty_struct *tty)
+{
+        struct cyclades_card *cinfo;
+        struct cyclades_port *info = tty->driver_data;
+        int channel;
+        unsigned long flags;
+
+#ifdef CY_DEBUG_OTHER
+        printk(KERN_DEBUG "cyc:cy_start ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_start"))
+                return;
+
+        cinfo = info->card;
+        channel = info->line - cinfo->first_line;
+        if (!cy_is_Z(cinfo)) {
+                spin_lock_irqsave(&cinfo->card_lock, flags);
+                cyy_writeb(info, CyCAR, channel & 0x03);
+                cyy_writeb(info, CySRER, cyy_readb(info, CySRER) | CyTxRdy);
+                spin_unlock_irqrestore(&cinfo->card_lock, flags);
+        }
+}                               /* cy_start */
+
+/*
+ * cy_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void cy_hangup(struct tty_struct *tty)
+{
+        struct cyclades_port *info = tty->driver_data;
+
+#ifdef CY_DEBUG_OTHER
+        printk(KERN_DEBUG "cyc:cy_hangup ttyC%d\n", info->line);
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "cy_hangup"))
+                return;
+
+        cy_flush_buffer(tty);
+        cy_shutdown(info, tty);
+        tty_port_hangup(&info->port);
+}                               /* cy_hangup */
+
+static int cyy_carrier_raised(struct tty_port *port)
+{
+        struct cyclades_port *info = container_of(port, struct cyclades_port,
+                        port);
+        struct cyclades_card *cinfo = info->card;
+        unsigned long flags;
+        int channel = info->line - cinfo->first_line;
+        u32 cd;
+
+        spin_lock_irqsave(&cinfo->card_lock, flags);
+        cyy_writeb(info, CyCAR, channel & 0x03);
+        cd = cyy_readb(info, CyMSVR1) & CyDCD;
+        spin_unlock_irqrestore(&cinfo->card_lock, flags);
+
+        return cd;
+}
+
+static void cyy_dtr_rts(struct tty_port *port, int raise)
+{
+        struct cyclades_port *info = container_of(port, struct cyclades_port,
+                        port);
+        struct cyclades_card *cinfo = info->card;
+        unsigned long flags;
+
+        spin_lock_irqsave(&cinfo->card_lock, flags);
+        cyy_change_rts_dtr(info, raise ? TIOCM_RTS | TIOCM_DTR : 0,
+                        raise ? 0 : TIOCM_RTS | TIOCM_DTR);
+        spin_unlock_irqrestore(&cinfo->card_lock, flags);
+}
+
+static int cyz_carrier_raised(struct tty_port *port)
+{
+        struct cyclades_port *info = container_of(port, struct cyclades_port,
+                        port);
+
+        return readl(&info->u.cyz.ch_ctrl->rs_status) & C_RS_DCD;
+}
+
+static void cyz_dtr_rts(struct tty_port *port, int raise)
+{
+        struct cyclades_port *info = container_of(port, struct cyclades_port,
+                        port);
+        struct cyclades_card *cinfo = info->card;
+        struct CH_CTRL __iomem *ch_ctrl = info->u.cyz.ch_ctrl;
+        int ret, channel = info->line - cinfo->first_line;
+        u32 rs;
+
+        rs = readl(&ch_ctrl->rs_control);
+        if (raise)
+                rs |= C_RS_RTS | C_RS_DTR;
+        else
+                rs &= ~(C_RS_RTS | C_RS_DTR);
+        cy_writel(&ch_ctrl->rs_control, rs);
+        ret = cyz_issue_cmd(cinfo, channel, C_CM_IOCTLM, 0L);
+        if (ret != 0)
+                printk(KERN_ERR "%s: retval on ttyC%d was %x\n",
+                                __func__, info->line, ret);
+#ifdef CY_DEBUG_DTR
+        printk(KERN_DEBUG "%s: raising Z DTR\n", __func__);
+#endif
+}
+
+static const struct tty_port_operations cyy_port_ops = {
+        .carrier_raised = cyy_carrier_raised,
+        .dtr_rts = cyy_dtr_rts,
+        .shutdown = cy_do_close,
+};
+
+static const struct tty_port_operations cyz_port_ops = {
+        .carrier_raised = cyz_carrier_raised,
+        .dtr_rts = cyz_dtr_rts,
+        .shutdown = cy_do_close,
+};
+
+/*
+ * ---------------------------------------------------------------------
+ * cy_init() and friends
+ *
+ * cy_init() is called at boot-time to initialize the serial driver.
+ * ---------------------------------------------------------------------
+ */
+
+static int __devinit cy_init_card(struct cyclades_card *cinfo)
+{
+        struct cyclades_port *info;
+        unsigned int channel, port;
+
+        spin_lock_init(&cinfo->card_lock);
+        cinfo->intr_enabled = 0;
+
+        cinfo->ports = kcalloc(cinfo->nports, sizeof(*cinfo->ports),
+                        GFP_KERNEL);
+        if (cinfo->ports == NULL) {
+                printk(KERN_ERR "Cyclades: cannot allocate ports\n");
+                return -ENOMEM;
+        }
+
+        for (channel = 0, port = cinfo->first_line; channel < cinfo->nports;
+                        channel++, port++) {
+                info = &cinfo->ports[channel];
+                tty_port_init(&info->port);
+                info->magic = CYCLADES_MAGIC;
+                info->card = cinfo;
+                info->line = port;
+
+                info->port.closing_wait = CLOSING_WAIT_DELAY;
+                info->port.close_delay = 5 * HZ / 10;
+                info->port.flags = STD_COM_FLAGS;
+                init_completion(&info->shutdown_wait);
+
+                if (cy_is_Z(cinfo)) {
+                        struct FIRM_ID *firm_id = cinfo->base_addr + ID_ADDRESS;
+                        struct ZFW_CTRL *zfw_ctrl;
+
+                        info->port.ops = &cyz_port_ops;
+                        info->type = PORT_STARTECH;
+
+                        zfw_ctrl = cinfo->base_addr +
+                                (readl(&firm_id->zfwctrl_addr) & 0xfffff);
+                        info->u.cyz.ch_ctrl = &zfw_ctrl->ch_ctrl[channel];
+                        info->u.cyz.buf_ctrl = &zfw_ctrl->buf_ctrl[channel];
+
+                        if (cinfo->hw_ver == ZO_V1)
+                                info->xmit_fifo_size = CYZ_FIFO_SIZE;
+                        else
+                                info->xmit_fifo_size = 4 * CYZ_FIFO_SIZE;
+#ifdef CONFIG_CYZ_INTR
+                        setup_timer(&cyz_rx_full_timer[port],
+                                cyz_rx_restart, (unsigned long)info);
+#endif
+                } else {
+                        unsigned short chip_number;
+                        int index = cinfo->bus_index;
+
+                        info->port.ops = &cyy_port_ops;
+                        info->type = PORT_CIRRUS;
+                        info->xmit_fifo_size = CyMAX_CHAR_FIFO;
+                        info->cor1 = CyPARITY_NONE | Cy_1_STOP | Cy_8_BITS;
+                        info->cor2 = CyETC;
+                        info->cor3 = 0x08;      /* _very_ small rcv threshold */
+
+                        chip_number = channel / CyPORTS_PER_CHIP;
+                        info->u.cyy.base_addr = cinfo->base_addr +
+                                (cy_chip_offset[chip_number] << index);
+                        info->chip_rev = cyy_readb(info, CyGFRCR);
+
+                        if (info->chip_rev >= CD1400_REV_J) {
+                                /* It is a CD1400 rev. J or later */
+                                info->tbpr = baud_bpr_60[13];   /* Tx BPR */
+                                info->tco = baud_co_60[13];     /* Tx CO */
+                                info->rbpr = baud_bpr_60[13];   /* Rx BPR */
+                                info->rco = baud_co_60[13];     /* Rx CO */
+                                info->rtsdtr_inv = 1;
+                        } else {
+                                info->tbpr = baud_bpr_25[13];   /* Tx BPR */
+                                info->tco = baud_co_25[13];     /* Tx CO */
+                                info->rbpr = baud_bpr_25[13];   /* Rx BPR */
+                                info->rco = baud_co_25[13];     /* Rx CO */
+                                info->rtsdtr_inv = 0;
+                        }
+                        info->read_status_mask = CyTIMEOUT | CySPECHAR |
+                                CyBREAK | CyPARITY | CyFRAME | CyOVERRUN;
+                }
+
+        }
+
+#ifndef CONFIG_CYZ_INTR
+        if (cy_is_Z(cinfo) && !timer_pending(&cyz_timerlist)) {
+                mod_timer(&cyz_timerlist, jiffies + 1);
+#ifdef CY_PCI_DEBUG
+                printk(KERN_DEBUG "Cyclades-Z polling initialized\n");
+#endif
+        }
+#endif
+        return 0;
+}
+
+/* initialize chips on Cyclom-Y card -- return number of valid
+   chips (which is number of ports/4) */
+static unsigned short __devinit cyy_init_card(void __iomem *true_base_addr,
+                int index)
+{
+        unsigned int chip_number;
+        void __iomem *base_addr;
+
+        cy_writeb(true_base_addr + (Cy_HwReset << index), 0);
+        /* Cy_HwReset is 0x1400 */
+        cy_writeb(true_base_addr + (Cy_ClrIntr << index), 0);
+        /* Cy_ClrIntr is 0x1800 */
+        udelay(500L);
+
+        for (chip_number = 0; chip_number < CyMAX_CHIPS_PER_CARD;
+                                                        chip_number++) {
+                base_addr =
+                    true_base_addr + (cy_chip_offset[chip_number] << index);
+                mdelay(1);
+                if (readb(base_addr + (CyCCR << index)) != 0x00) {
+                        /*************
+                        printk(" chip #%d at %#6lx is never idle (CCR != 0)\n",
+                        chip_number, (unsigned long)base_addr);
+                        *************/
+                        return chip_number;
+                }
+
+                cy_writeb(base_addr + (CyGFRCR << index), 0);
+                udelay(10L);
+
+                /* The Cyclom-16Y does not decode address bit 9 and therefore
+                   cannot distinguish between references to chip 0 and a non-
+                   existent chip 4.  If the preceding clearing of the supposed
+                   chip 4 GFRCR register appears at chip 0, there is no chip 4
+                   and this must be a Cyclom-16Y, not a Cyclom-32Ye.
+                 */
+                if (chip_number == 4 && readb(true_base_addr +
+                                (cy_chip_offset[0] << index) +
+                                (CyGFRCR << index)) == 0) {
+                        return chip_number;
+                }
+
+                cy_writeb(base_addr + (CyCCR << index), CyCHIP_RESET);
+                mdelay(1);
+
+                if (readb(base_addr + (CyGFRCR << index)) == 0x00) {
+                        /*
+                           printk(" chip #%d at %#6lx is not responding ",
+                           chip_number, (unsigned long)base_addr);
+                           printk("(GFRCR stayed 0)\n",
+                         */
+                        return chip_number;
+                }
+                if ((0xf0 & (readb(base_addr + (CyGFRCR << index)))) !=
+                                0x40) {
+                        /*
+                        printk(" chip #%d at %#6lx is not valid (GFRCR == "
+                                        "%#2x)\n",
+                                        chip_number, (unsigned long)base_addr,
+                                        base_addr[CyGFRCR<<index]);
+                         */
+                        return chip_number;
+                }
+                cy_writeb(base_addr + (CyGCR << index), CyCH0_SERIAL);
+                if (readb(base_addr + (CyGFRCR << index)) >= CD1400_REV_J) {
+                        /* It is a CD1400 rev. J or later */
+                        /* Impossible to reach 5ms with this chip.
+                           Changed to 2ms instead (f = 500 Hz). */
+                        cy_writeb(base_addr + (CyPPR << index), CyCLOCK_60_2MS);
+                } else {
+                        /* f = 200 Hz */
+                        cy_writeb(base_addr + (CyPPR << index), CyCLOCK_25_5MS);
+                }
+
+                /*
+                   printk(" chip #%d at %#6lx is rev 0x%2x\n",
+                   chip_number, (unsigned long)base_addr,
+                   readb(base_addr+(CyGFRCR<<index)));
+                 */
+        }
+        return chip_number;
+}                               /* cyy_init_card */
+
+/*
+ * ---------------------------------------------------------------------
+ * cy_detect_isa() - Probe for Cyclom-Y/ISA boards.
+ * sets global variables and return the number of ISA boards found.
+ * ---------------------------------------------------------------------
+ */
+static int __init cy_detect_isa(void)
+{
+#ifdef CONFIG_ISA
+        unsigned short cy_isa_irq, nboard;
+        void __iomem *cy_isa_address;
+        unsigned short i, j, cy_isa_nchan;
+        int isparam = 0;
+
+        nboard = 0;
+
+        /* Check for module parameters */
+        for (i = 0; i < NR_CARDS; i++) {
+                if (maddr[i] || i) {
+                        isparam = 1;
+                        cy_isa_addresses[i] = maddr[i];
+                }
+                if (!maddr[i])
+                        break;
+        }
+
+        /* scan the address table probing for Cyclom-Y/ISA boards */
+        for (i = 0; i < NR_ISA_ADDRS; i++) {
+                unsigned int isa_address = cy_isa_addresses[i];
+                if (isa_address == 0x0000)
+                        return nboard;
+
+                /* probe for CD1400... */
+                cy_isa_address = ioremap_nocache(isa_address, CyISA_Ywin);
+                if (cy_isa_address == NULL) {
+                        printk(KERN_ERR "Cyclom-Y/ISA: can't remap base "
+                                        "address\n");
+                        continue;
+                }
+                cy_isa_nchan = CyPORTS_PER_CHIP *
+                        cyy_init_card(cy_isa_address, 0);
+                if (cy_isa_nchan == 0) {
+                        iounmap(cy_isa_address);
+                        continue;
+                }
+
+                if (isparam && i < NR_CARDS && irq[i])
+                        cy_isa_irq = irq[i];
+                else
+                        /* find out the board's irq by probing */
+                        cy_isa_irq = detect_isa_irq(cy_isa_address);
+                if (cy_isa_irq == 0) {
+                        printk(KERN_ERR "Cyclom-Y/ISA found at 0x%lx, but the "
+                                "IRQ could not be detected.\n",
+                                (unsigned long)cy_isa_address);
+                        iounmap(cy_isa_address);
+                        continue;
+                }
+
+                if ((cy_next_channel + cy_isa_nchan) > NR_PORTS) {
+                        printk(KERN_ERR "Cyclom-Y/ISA found at 0x%lx, but no "
+                                "more channels are available. Change NR_PORTS "
+                                "in cyclades.c and recompile kernel.\n",
+                                (unsigned long)cy_isa_address);
+                        iounmap(cy_isa_address);
+                        return nboard;
+                }
+                /* fill the next cy_card structure available */
+                for (j = 0; j < NR_CARDS; j++) {
+                        if (cy_card[j].base_addr == NULL)
+                                break;
+                }
+                if (j == NR_CARDS) {    /* no more cy_cards available */
+                        printk(KERN_ERR "Cyclom-Y/ISA found at 0x%lx, but no "
+                                "more cards can be used. Change NR_CARDS in "
+                                "cyclades.c and recompile kernel.\n",
+                                (unsigned long)cy_isa_address);
+                        iounmap(cy_isa_address);
+                        return nboard;
+                }
+
+                /* allocate IRQ */
+                if (request_irq(cy_isa_irq, cyy_interrupt,
+                                IRQF_DISABLED, "Cyclom-Y", &cy_card[j])) {
+                        printk(KERN_ERR "Cyclom-Y/ISA found at 0x%lx, but "
+                                "could not allocate IRQ#%d.\n",
+                                (unsigned long)cy_isa_address, cy_isa_irq);
+                        iounmap(cy_isa_address);
+                        return nboard;
+                }
+
+                /* set cy_card */
+                cy_card[j].base_addr = cy_isa_address;
+                cy_card[j].ctl_addr.p9050 = NULL;
+                cy_card[j].irq = (int)cy_isa_irq;
+                cy_card[j].bus_index = 0;
+                cy_card[j].first_line = cy_next_channel;
+                cy_card[j].num_chips = cy_isa_nchan / CyPORTS_PER_CHIP;
+                cy_card[j].nports = cy_isa_nchan;
+                if (cy_init_card(&cy_card[j])) {
+                        cy_card[j].base_addr = NULL;
+                        free_irq(cy_isa_irq, &cy_card[j]);
+                        iounmap(cy_isa_address);
+                        continue;
+                }
+                nboard++;
+
+                printk(KERN_INFO "Cyclom-Y/ISA #%d: 0x%lx-0x%lx, IRQ%d found: "
+                        "%d channels starting from port %d\n",
+                        j + 1, (unsigned long)cy_isa_address,
+                        (unsigned long)(cy_isa_address + (CyISA_Ywin - 1)),
+                        cy_isa_irq, cy_isa_nchan, cy_next_channel);
+
+                for (j = cy_next_channel;
+                                j < cy_next_channel + cy_isa_nchan; j++)
+                        tty_register_device(cy_serial_driver, j, NULL);
+                cy_next_channel += cy_isa_nchan;
+        }
+        return nboard;
+#else
+        return 0;
+#endif                          /* CONFIG_ISA */
+}                               /* cy_detect_isa */
+
+#ifdef CONFIG_PCI
+static inline int __devinit cyc_isfwstr(const char *str, unsigned int size)
+{
+        unsigned int a;
+
+        for (a = 0; a < size && *str; a++, str++)
+                if (*str & 0x80)
+                        return -EINVAL;
+
+        for (; a < size; a++, str++)
+                if (*str)
+                        return -EINVAL;
+
+        return 0;
+}
+
+static inline void __devinit cyz_fpga_copy(void __iomem *fpga, const u8 *data,
+                unsigned int size)
+{
+        for (; size > 0; size--) {
+                cy_writel(fpga, *data++);
+                udelay(10);
+        }
+}
+
+static void __devinit plx_init(struct pci_dev *pdev, int irq,
+                struct RUNTIME_9060 __iomem *addr)
+{
+        /* Reset PLX */
+        cy_writel(&addr->init_ctrl, readl(&addr->init_ctrl) | 0x40000000);
+        udelay(100L);
+        cy_writel(&addr->init_ctrl, readl(&addr->init_ctrl) & ~0x40000000);
+
+        /* Reload Config. Registers from EEPROM */
+        cy_writel(&addr->init_ctrl, readl(&addr->init_ctrl) | 0x20000000);
+        udelay(100L);
+        cy_writel(&addr->init_ctrl, readl(&addr->init_ctrl) & ~0x20000000);
+
+        /* For some yet unknown reason, once the PLX9060 reloads the EEPROM,
+         * the IRQ is lost and, thus, we have to re-write it to the PCI config.
+         * registers. This will remain here until we find a permanent fix.
+         */
+        pci_write_config_byte(pdev, PCI_INTERRUPT_LINE, irq);
+}
+
+static int __devinit __cyz_load_fw(const struct firmware *fw,
+                const char *name, const u32 mailbox, void __iomem *base,
+                void __iomem *fpga)
+{
+        const void *ptr = fw->data;
+        const struct zfile_header *h = ptr;
+        const struct zfile_config *c, *cs;
+        const struct zfile_block *b, *bs;
+        unsigned int a, tmp, len = fw->size;
+#define BAD_FW KERN_ERR "Bad firmware: "
+        if (len < sizeof(*h)) {
+                printk(BAD_FW "too short: %u<%zu\n", len, sizeof(*h));
+                return -EINVAL;
+        }
+
+        cs = ptr + h->config_offset;
+        bs = ptr + h->block_offset;
+
+        if ((void *)(cs + h->n_config) > ptr + len ||
+                        (void *)(bs + h->n_blocks) > ptr + len) {
+                printk(BAD_FW "too short");
+                return  -EINVAL;
+        }
+
+        if (cyc_isfwstr(h->name, sizeof(h->name)) ||
+                        cyc_isfwstr(h->date, sizeof(h->date))) {
+                printk(BAD_FW "bad formatted header string\n");
+                return -EINVAL;
+        }
+
+        if (strncmp(name, h->name, sizeof(h->name))) {
+                printk(BAD_FW "bad name '%s' (expected '%s')\n", h->name, name);
+                return -EINVAL;
+        }
+
+        tmp = 0;
+        for (c = cs; c < cs + h->n_config; c++) {
+                for (a = 0; a < c->n_blocks; a++)
+                        if (c->block_list[a] > h->n_blocks) {
+                                printk(BAD_FW "bad block ref number in cfgs\n");
+                                return -EINVAL;
+                        }
+                if (c->mailbox == mailbox && c->function == 0) /* 0 is normal */
+                        tmp++;
+        }
+        if (!tmp) {
+                printk(BAD_FW "nothing appropriate\n");
+                return -EINVAL;
+        }
+
+        for (b = bs; b < bs + h->n_blocks; b++)
+                if (b->file_offset + b->size > len) {
+                        printk(BAD_FW "bad block data offset\n");
+                        return -EINVAL;
+                }
+
+        /* everything is OK, let's seek'n'load it */
+        for (c = cs; c < cs + h->n_config; c++)
+                if (c->mailbox == mailbox && c->function == 0)
+                        break;
+
+        for (a = 0; a < c->n_blocks; a++) {
+                b = &bs[c->block_list[a]];
+                if (b->type == ZBLOCK_FPGA) {
+                        if (fpga != NULL)
+                                cyz_fpga_copy(fpga, ptr + b->file_offset,
+                                                b->size);
+                } else {
+                        if (base != NULL)
+                                memcpy_toio(base + b->ram_offset,
+                                               ptr + b->file_offset, b->size);
+                }
+        }
+#undef BAD_FW
+        return 0;
+}
+
+static int __devinit cyz_load_fw(struct pci_dev *pdev, void __iomem *base_addr,
+                struct RUNTIME_9060 __iomem *ctl_addr, int irq)
+{
+        const struct firmware *fw;
+        struct FIRM_ID __iomem *fid = base_addr + ID_ADDRESS;
+        struct CUSTOM_REG __iomem *cust = base_addr;
+        struct ZFW_CTRL __iomem *pt_zfwctrl;
+        void __iomem *tmp;
+        u32 mailbox, status, nchan;
+        unsigned int i;
+        int retval;
+
+        retval = request_firmware(&fw, "cyzfirm.bin", &pdev->dev);
+        if (retval) {
+                dev_err(&pdev->dev, "can't get firmware\n");
+                goto err;
+        }
+
+        /* Check whether the firmware is already loaded and running. If
+           positive, skip this board */
+        if (__cyz_fpga_loaded(ctl_addr) && readl(&fid->signature) == ZFIRM_ID) {
+                u32 cntval = readl(base_addr + 0x190);
+
+                udelay(100);
+                if (cntval != readl(base_addr + 0x190)) {
+                        /* FW counter is working, FW is running */
+                        dev_dbg(&pdev->dev, "Cyclades-Z FW already loaded. "
+                                        "Skipping board.\n");
+                        retval = 0;
+                        goto err_rel;
+                }
+        }
+
+        /* start boot */
+        cy_writel(&ctl_addr->intr_ctrl_stat, readl(&ctl_addr->intr_ctrl_stat) &
+                        ~0x00030800UL);
+
+        mailbox = readl(&ctl_addr->mail_box_0);
+
+        if (mailbox == 0 || __cyz_fpga_loaded(ctl_addr)) {
+                /* stops CPU and set window to beginning of RAM */
+                cy_writel(&ctl_addr->loc_addr_base, WIN_CREG);
+                cy_writel(&cust->cpu_stop, 0);
+                cy_writel(&ctl_addr->loc_addr_base, WIN_RAM);
+                udelay(100);
+        }
+
+        plx_init(pdev, irq, ctl_addr);
+
+        if (mailbox != 0) {
+                /* load FPGA */
+                retval = __cyz_load_fw(fw, "Cyclom-Z", mailbox, NULL,
+                                base_addr);
+                if (retval)
+                        goto err_rel;
+                if (!__cyz_fpga_loaded(ctl_addr)) {
+                        dev_err(&pdev->dev, "fw upload successful, but fw is "
+                                        "not loaded\n");
+                        goto err_rel;
+                }
+        }
+
+        /* stops CPU and set window to beginning of RAM */
+        cy_writel(&ctl_addr->loc_addr_base, WIN_CREG);
+        cy_writel(&cust->cpu_stop, 0);
+        cy_writel(&ctl_addr->loc_addr_base, WIN_RAM);
+        udelay(100);
+
+        /* clear memory */
+        for (tmp = base_addr; tmp < base_addr + RAM_SIZE; tmp++)
+                cy_writeb(tmp, 255);
+        if (mailbox != 0) {
+                /* set window to last 512K of RAM */
+                cy_writel(&ctl_addr->loc_addr_base, WIN_RAM + RAM_SIZE);
+                for (tmp = base_addr; tmp < base_addr + RAM_SIZE; tmp++)
+                        cy_writeb(tmp, 255);
+                /* set window to beginning of RAM */
+                cy_writel(&ctl_addr->loc_addr_base, WIN_RAM);
+        }
+
+        retval = __cyz_load_fw(fw, "Cyclom-Z", mailbox, base_addr, NULL);
+        release_firmware(fw);
+        if (retval)
+                goto err;
+
+        /* finish boot and start boards */
+        cy_writel(&ctl_addr->loc_addr_base, WIN_CREG);
+        cy_writel(&cust->cpu_start, 0);
+        cy_writel(&ctl_addr->loc_addr_base, WIN_RAM);
+        i = 0;
+        while ((status = readl(&fid->signature)) != ZFIRM_ID && i++ < 40)
+                msleep(100);
+        if (status != ZFIRM_ID) {
+                if (status == ZFIRM_HLT) {
+                        dev_err(&pdev->dev, "you need an external power supply "
+                                "for this number of ports. Firmware halted and "
+                                "board reset.\n");
+                        retval = -EIO;
+                        goto err;
+                }
+                dev_warn(&pdev->dev, "fid->signature = 0x%x... Waiting "
+                                "some more time\n", status);
+                while ((status = readl(&fid->signature)) != ZFIRM_ID &&
+                                i++ < 200)
+                        msleep(100);
+                if (status != ZFIRM_ID) {
+                        dev_err(&pdev->dev, "Board not started in 20 seconds! "
+                                        "Giving up. (fid->signature = 0x%x)\n",
+                                        status);
+                        dev_info(&pdev->dev, "*** Warning ***: if you are "
+                                "upgrading the FW, please power cycle the "
+                                "system before loading the new FW to the "
+                                "Cyclades-Z.\n");
+
+                        if (__cyz_fpga_loaded(ctl_addr))
+                                plx_init(pdev, irq, ctl_addr);
+
+                        retval = -EIO;
+                        goto err;
+                }
+                dev_dbg(&pdev->dev, "Firmware started after %d seconds.\n",
+                                i / 10);
+        }
+        pt_zfwctrl = base_addr + readl(&fid->zfwctrl_addr);
+
+        dev_dbg(&pdev->dev, "fid=> %p, zfwctrl_addr=> %x, npt_zfwctrl=> %p\n",
+                        base_addr + ID_ADDRESS, readl(&fid->zfwctrl_addr),
+                        base_addr + readl(&fid->zfwctrl_addr));
+
+        nchan = readl(&pt_zfwctrl->board_ctrl.n_channel);
+        dev_info(&pdev->dev, "Cyclades-Z FW loaded: version = %x, ports = %u\n",
+                readl(&pt_zfwctrl->board_ctrl.fw_version), nchan);
+
+        if (nchan == 0) {
+                dev_warn(&pdev->dev, "no Cyclades-Z ports were found. Please "
+                        "check the connection between the Z host card and the "
+                        "serial expanders.\n");
+
+                if (__cyz_fpga_loaded(ctl_addr))
+                        plx_init(pdev, irq, ctl_addr);
+
+                dev_info(&pdev->dev, "Null number of ports detected. Board "
+                                "reset.\n");
+                retval = 0;
+                goto err;
+        }
+
+        cy_writel(&pt_zfwctrl->board_ctrl.op_system, C_OS_LINUX);
+        cy_writel(&pt_zfwctrl->board_ctrl.dr_version, DRIVER_VERSION);
+
+        /*
+           Early firmware failed to start looking for commands.
+           This enables firmware interrupts for those commands.
+         */
+        cy_writel(&ctl_addr->intr_ctrl_stat, readl(&ctl_addr->intr_ctrl_stat) |
+                        (1 << 17));
+        cy_writel(&ctl_addr->intr_ctrl_stat, readl(&ctl_addr->intr_ctrl_stat) |
+                        0x00030800UL);
+
+        return nchan;
+err_rel:
+        release_firmware(fw);
+err:
+        return retval;
+}
+
+static int __devinit cy_pci_probe(struct pci_dev *pdev,
+                const struct pci_device_id *ent)
+{
+        void __iomem *addr0 = NULL, *addr2 = NULL;
+        char *card_name = NULL;
+        u32 uninitialized_var(mailbox);
+        unsigned int device_id, nchan = 0, card_no, i;
+        unsigned char plx_ver;
+        int retval, irq;
+
+        retval = pci_enable_device(pdev);
+        if (retval) {
+                dev_err(&pdev->dev, "cannot enable device\n");
+                goto err;
+        }
+
+        /* read PCI configuration area */
+        irq = pdev->irq;
+        device_id = pdev->device & ~PCI_DEVICE_ID_MASK;
+
+#if defined(__alpha__)
+        if (device_id == PCI_DEVICE_ID_CYCLOM_Y_Lo) {   /* below 1M? */
+                dev_err(&pdev->dev, "Cyclom-Y/PCI not supported for low "
+                        "addresses on Alpha systems.\n");
+                retval = -EIO;
+                goto err_dis;
+        }
+#endif
+        if (device_id == PCI_DEVICE_ID_CYCLOM_Z_Lo) {
+                dev_err(&pdev->dev, "Cyclades-Z/PCI not supported for low "
+                        "addresses\n");
+                retval = -EIO;
+                goto err_dis;
+        }
+
+        if (pci_resource_flags(pdev, 2) & IORESOURCE_IO) {
+                dev_warn(&pdev->dev, "PCI I/O bit incorrectly set. Ignoring "
+                                "it...\n");
+                pdev->resource[2].flags &= ~IORESOURCE_IO;
+        }
+
+        retval = pci_request_regions(pdev, "cyclades");
+        if (retval) {
+                dev_err(&pdev->dev, "failed to reserve resources\n");
+                goto err_dis;
+        }
+
+        retval = -EIO;
+        if (device_id == PCI_DEVICE_ID_CYCLOM_Y_Lo ||
+                        device_id == PCI_DEVICE_ID_CYCLOM_Y_Hi) {
+                card_name = "Cyclom-Y";
+
+                addr0 = ioremap_nocache(pci_resource_start(pdev, 0),
+                                CyPCI_Yctl);
+                if (addr0 == NULL) {
+                        dev_err(&pdev->dev, "can't remap ctl region\n");
+                        goto err_reg;
+                }
+                addr2 = ioremap_nocache(pci_resource_start(pdev, 2),
+                                CyPCI_Ywin);
+                if (addr2 == NULL) {
+                        dev_err(&pdev->dev, "can't remap base region\n");
+                        goto err_unmap;
+                }
+
+                nchan = CyPORTS_PER_CHIP * cyy_init_card(addr2, 1);
+                if (nchan == 0) {
+                        dev_err(&pdev->dev, "Cyclom-Y PCI host card with no "
+                                        "Serial-Modules\n");
+                        goto err_unmap;
+                }
+        } else if (device_id == PCI_DEVICE_ID_CYCLOM_Z_Hi) {
+                struct RUNTIME_9060 __iomem *ctl_addr;
+
+                ctl_addr = addr0 = ioremap_nocache(pci_resource_start(pdev, 0),
+                                CyPCI_Zctl);
+                if (addr0 == NULL) {
+                        dev_err(&pdev->dev, "can't remap ctl region\n");
+                        goto err_reg;
+                }
+
+                /* Disable interrupts on the PLX before resetting it */
+                cy_writew(&ctl_addr->intr_ctrl_stat,
+                                readw(&ctl_addr->intr_ctrl_stat) & ~0x0900);
+
+                plx_init(pdev, irq, addr0);
+
+                mailbox = readl(&ctl_addr->mail_box_0);
+
+                addr2 = ioremap_nocache(pci_resource_start(pdev, 2),
+                                mailbox == ZE_V1 ? CyPCI_Ze_win : CyPCI_Zwin);
+                if (addr2 == NULL) {
+                        dev_err(&pdev->dev, "can't remap base region\n");
+                        goto err_unmap;
+                }
+
+                if (mailbox == ZE_V1) {
+                        card_name = "Cyclades-Ze";
+                } else {
+                        card_name = "Cyclades-8Zo";
+#ifdef CY_PCI_DEBUG
+                        if (mailbox == ZO_V1) {
+                                cy_writel(&ctl_addr->loc_addr_base, WIN_CREG);
+                                dev_info(&pdev->dev, "Cyclades-8Zo/PCI: FPGA "
+                                        "id %lx, ver %lx\n", (ulong)(0xff &
+                                        readl(&((struct CUSTOM_REG *)addr2)->
+                                                fpga_id)), (ulong)(0xff &
+                                        readl(&((struct CUSTOM_REG *)addr2)->
+                                                fpga_version)));
+                                cy_writel(&ctl_addr->loc_addr_base, WIN_RAM);
+                        } else {
+                                dev_info(&pdev->dev, "Cyclades-Z/PCI: New "
+                                        "Cyclades-Z board.  FPGA not loaded\n");
+                        }
+#endif
+                        /* The following clears the firmware id word.  This
+                           ensures that the driver will not attempt to talk to
+                           the board until it has been properly initialized.
+                         */
+                        if ((mailbox == ZO_V1) || (mailbox == ZO_V2))
+                                cy_writel(addr2 + ID_ADDRESS, 0L);
+                }
+
+                retval = cyz_load_fw(pdev, addr2, addr0, irq);
+                if (retval <= 0)
+                        goto err_unmap;
+                nchan = retval;
+        }
+
+        if ((cy_next_channel + nchan) > NR_PORTS) {
+                dev_err(&pdev->dev, "Cyclades-8Zo/PCI found, but no "
+                        "channels are available. Change NR_PORTS in "
+                        "cyclades.c and recompile kernel.\n");
+                goto err_unmap;
+        }
+        /* fill the next cy_card structure available */
+        for (card_no = 0; card_no < NR_CARDS; card_no++) {
+                if (cy_card[card_no].base_addr == NULL)
+                        break;
+        }
+        if (card_no == NR_CARDS) {      /* no more cy_cards available */
+                dev_err(&pdev->dev, "Cyclades-8Zo/PCI found, but no "
+                        "more cards can be used. Change NR_CARDS in "
+                        "cyclades.c and recompile kernel.\n");
+                goto err_unmap;
+        }
+
+        if (device_id == PCI_DEVICE_ID_CYCLOM_Y_Lo ||
+                        device_id == PCI_DEVICE_ID_CYCLOM_Y_Hi) {
+                /* allocate IRQ */
+                retval = request_irq(irq, cyy_interrupt,
+                                IRQF_SHARED, "Cyclom-Y", &cy_card[card_no]);
+                if (retval) {
+                        dev_err(&pdev->dev, "could not allocate IRQ\n");
+                        goto err_unmap;
+                }
+                cy_card[card_no].num_chips = nchan / CyPORTS_PER_CHIP;
+        } else {
+                struct FIRM_ID __iomem *firm_id = addr2 + ID_ADDRESS;
+                struct ZFW_CTRL __iomem *zfw_ctrl;
+
+                zfw_ctrl = addr2 + (readl(&firm_id->zfwctrl_addr) & 0xfffff);
+
+                cy_card[card_no].hw_ver = mailbox;
+                cy_card[card_no].num_chips = (unsigned int)-1;
+                cy_card[card_no].board_ctrl = &zfw_ctrl->board_ctrl;
+#ifdef CONFIG_CYZ_INTR
+                /* allocate IRQ only if board has an IRQ */
+                if (irq != 0 && irq != 255) {
+                        retval = request_irq(irq, cyz_interrupt,
+                                        IRQF_SHARED, "Cyclades-Z",
+                                        &cy_card[card_no]);
+                        if (retval) {
+                                dev_err(&pdev->dev, "could not allocate IRQ\n");
+                                goto err_unmap;
+                        }
+                }
+#endif                          /* CONFIG_CYZ_INTR */
+        }
+
+        /* set cy_card */
+        cy_card[card_no].base_addr = addr2;
+        cy_card[card_no].ctl_addr.p9050 = addr0;
+        cy_card[card_no].irq = irq;
+        cy_card[card_no].bus_index = 1;
+        cy_card[card_no].first_line = cy_next_channel;
+        cy_card[card_no].nports = nchan;
+        retval = cy_init_card(&cy_card[card_no]);
+        if (retval)
+                goto err_null;
+
+        pci_set_drvdata(pdev, &cy_card[card_no]);
+
+        if (device_id == PCI_DEVICE_ID_CYCLOM_Y_Lo ||
+                        device_id == PCI_DEVICE_ID_CYCLOM_Y_Hi) {
+                /* enable interrupts in the PCI interface */
+                plx_ver = readb(addr2 + CyPLX_VER) & 0x0f;
+                switch (plx_ver) {
+                case PLX_9050:
+                        cy_writeb(addr0 + 0x4c, 0x43);
+                        break;
+
+                case PLX_9060:
+                case PLX_9080:
+                default:        /* Old boards, use PLX_9060 */
+                {
+                        struct RUNTIME_9060 __iomem *ctl_addr = addr0;
+                        plx_init(pdev, irq, ctl_addr);
+                        cy_writew(&ctl_addr->intr_ctrl_stat,
+                                readw(&ctl_addr->intr_ctrl_stat) | 0x0900);
+                        break;
+                }
+                }
+        }
+
+        dev_info(&pdev->dev, "%s/PCI #%d found: %d channels starting from "
+                "port %d.\n", card_name, card_no + 1, nchan, cy_next_channel);
+        for (i = cy_next_channel; i < cy_next_channel + nchan; i++)
+                tty_register_device(cy_serial_driver, i, &pdev->dev);
+        cy_next_channel += nchan;
+
+        return 0;
+err_null:
+        cy_card[card_no].base_addr = NULL;
+        free_irq(irq, &cy_card[card_no]);
+err_unmap:
+        iounmap(addr0);
+        if (addr2)
+                iounmap(addr2);
+err_reg:
+        pci_release_regions(pdev);
+err_dis:
+        pci_disable_device(pdev);
+err:
+        return retval;
+}
+
+static void __devexit cy_pci_remove(struct pci_dev *pdev)
+{
+        struct cyclades_card *cinfo = pci_get_drvdata(pdev);
+        unsigned int i;
+
+        /* non-Z with old PLX */
+        if (!cy_is_Z(cinfo) && (readb(cinfo->base_addr + CyPLX_VER) & 0x0f) ==
+                        PLX_9050)
+                cy_writeb(cinfo->ctl_addr.p9050 + 0x4c, 0);
+        else
+#ifndef CONFIG_CYZ_INTR
+                if (!cy_is_Z(cinfo))
+#endif
+                cy_writew(&cinfo->ctl_addr.p9060->intr_ctrl_stat,
+                        readw(&cinfo->ctl_addr.p9060->intr_ctrl_stat) &
+                        ~0x0900);
+
+        iounmap(cinfo->base_addr);
+        if (cinfo->ctl_addr.p9050)
+                iounmap(cinfo->ctl_addr.p9050);
+        if (cinfo->irq
+#ifndef CONFIG_CYZ_INTR
+                && !cy_is_Z(cinfo)
+#endif /* CONFIG_CYZ_INTR */
+                )
+                free_irq(cinfo->irq, cinfo);
+        pci_release_regions(pdev);
+
+        cinfo->base_addr = NULL;
+        for (i = cinfo->first_line; i < cinfo->first_line +
+                        cinfo->nports; i++)
+                tty_unregister_device(cy_serial_driver, i);
+        cinfo->nports = 0;
+        kfree(cinfo->ports);
+}
+
+static struct pci_driver cy_pci_driver = {
+        .name = "cyclades",
+        .id_table = cy_pci_dev_id,
+        .probe = cy_pci_probe,
+        .remove = __devexit_p(cy_pci_remove)
+};
+#endif
+
+static int cyclades_proc_show(struct seq_file *m, void *v)
+{
+        struct cyclades_port *info;
+        unsigned int i, j;
+        __u32 cur_jifs = jiffies;
+
+        seq_puts(m, "Dev TimeOpen   BytesOut  IdleOut    BytesIn   "
+                        "IdleIn  Overruns  Ldisc\n");
+
+        /* Output one line for each known port */
+        for (i = 0; i < NR_CARDS; i++)
+                for (j = 0; j < cy_card[i].nports; j++) {
+                        info = &cy_card[i].ports[j];
+
+                        if (info->port.count) {
+                                /* XXX is the ldisc num worth this? */
+                                struct tty_struct *tty;
+                                struct tty_ldisc *ld;
+                                int num = 0;
+                                tty = tty_port_tty_get(&info->port);
+                                if (tty) {
+                                        ld = tty_ldisc_ref(tty);
+                                        if (ld) {
+                                                num = ld->ops->num;
+                                                tty_ldisc_deref(ld);
+                                        }
+                                        tty_kref_put(tty);
+                                }
+                                seq_printf(m, "%3d %8lu %10lu %8lu "
+                                        "%10lu %8lu %9lu %6d\n", info->line,
+                                        (cur_jifs - info->idle_stats.in_use) /
+                                        HZ, info->idle_stats.xmit_bytes,
+                                        (cur_jifs - info->idle_stats.xmit_idle)/
+                                        HZ, info->idle_stats.recv_bytes,
+                                        (cur_jifs - info->idle_stats.recv_idle)/
+                                        HZ, info->idle_stats.overruns,
+                                        num);
+                        } else
+                                seq_printf(m, "%3d %8lu %10lu %8lu "
+                                        "%10lu %8lu %9lu %6ld\n",
+                                        info->line, 0L, 0L, 0L, 0L, 0L, 0L, 0L);
+                }
+        return 0;
+}
+
+static int cyclades_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, cyclades_proc_show, NULL);
+}
+
+static const struct file_operations cyclades_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = cyclades_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/* The serial driver boot-time initialization code!
+    Hardware I/O ports are mapped to character special devices on a
+    first found, first allocated manner.  That is, this code searches
+    for Cyclom cards in the system.  As each is found, it is probed
+    to discover how many chips (and thus how many ports) are present.
+    These ports are mapped to the tty ports 32 and upward in monotonic
+    fashion.  If an 8-port card is replaced with a 16-port card, the
+    port mapping on a following card will shift.
+
+    This approach is different from what is used in the other serial
+    device driver because the Cyclom is more properly a multiplexer,
+    not just an aggregation of serial ports on one card.
+
+    If there are more cards with more ports than have been
+    statically allocated above, a warning is printed and the
+    extra ports are ignored.
+ */
+
+static const struct tty_operations cy_ops = {
+        .open = cy_open,
+        .close = cy_close,
+        .write = cy_write,
+        .put_char = cy_put_char,
+        .flush_chars = cy_flush_chars,
+        .write_room = cy_write_room,
+        .chars_in_buffer = cy_chars_in_buffer,
+        .flush_buffer = cy_flush_buffer,
+        .ioctl = cy_ioctl,
+        .throttle = cy_throttle,
+        .unthrottle = cy_unthrottle,
+        .set_termios = cy_set_termios,
+        .stop = cy_stop,
+        .start = cy_start,
+        .hangup = cy_hangup,
+        .break_ctl = cy_break,
+        .wait_until_sent = cy_wait_until_sent,
+        .tiocmget = cy_tiocmget,
+        .tiocmset = cy_tiocmset,
+        .get_icount = cy_get_icount,
+        .proc_fops = &cyclades_proc_fops,
+};
+
+static int __init cy_init(void)
+{
+        unsigned int nboards;
+        int retval = -ENOMEM;
+
+        cy_serial_driver = alloc_tty_driver(NR_PORTS);
+        if (!cy_serial_driver)
+                goto err;
+
+        printk(KERN_INFO "Cyclades driver " CY_VERSION "\n");
+
+        /* Initialize the tty_driver structure */
+
+        cy_serial_driver->owner = THIS_MODULE;
+        cy_serial_driver->driver_name = "cyclades";
+        cy_serial_driver->name = "ttyC";
+        cy_serial_driver->major = CYCLADES_MAJOR;
+        cy_serial_driver->minor_start = 0;
+        cy_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        cy_serial_driver->subtype = SERIAL_TYPE_NORMAL;
+        cy_serial_driver->init_termios = tty_std_termios;
+        cy_serial_driver->init_termios.c_cflag =
+            B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        cy_serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        tty_set_operations(cy_serial_driver, &cy_ops);
+
+        retval = tty_register_driver(cy_serial_driver);
+        if (retval) {
+                printk(KERN_ERR "Couldn't register Cyclades serial driver\n");
+                goto err_frtty;
+        }
+
+        /* the code below is responsible to find the boards. Each different
+           type of board has its own detection routine. If a board is found,
+           the next cy_card structure available is set by the detection
+           routine. These functions are responsible for checking the
+           availability of cy_card and cy_port data structures and updating
+           the cy_next_channel. */
+
+        /* look for isa boards */
+        nboards = cy_detect_isa();
+
+#ifdef CONFIG_PCI
+        /* look for pci boards */
+        retval = pci_register_driver(&cy_pci_driver);
+        if (retval && !nboards) {
+                tty_unregister_driver(cy_serial_driver);
+                goto err_frtty;
+        }
+#endif
+
+        return 0;
+err_frtty:
+        put_tty_driver(cy_serial_driver);
+err:
+        return retval;
+}                               /* cy_init */
+
+static void __exit cy_cleanup_module(void)
+{
+        struct cyclades_card *card;
+        unsigned int i, e1;
+
+#ifndef CONFIG_CYZ_INTR
+        del_timer_sync(&cyz_timerlist);
+#endif /* CONFIG_CYZ_INTR */
+
+        e1 = tty_unregister_driver(cy_serial_driver);
+        if (e1)
+                printk(KERN_ERR "failed to unregister Cyclades serial "
+                                "driver(%d)\n", e1);
+
+#ifdef CONFIG_PCI
+        pci_unregister_driver(&cy_pci_driver);
+#endif
+
+        for (i = 0; i < NR_CARDS; i++) {
+                card = &cy_card[i];
+                if (card->base_addr) {
+                        /* clear interrupt */
+                        cy_writeb(card->base_addr + Cy_ClrIntr, 0);
+                        iounmap(card->base_addr);
+                        if (card->ctl_addr.p9050)
+                                iounmap(card->ctl_addr.p9050);
+                        if (card->irq
+#ifndef CONFIG_CYZ_INTR
+                                && !cy_is_Z(card)
+#endif /* CONFIG_CYZ_INTR */
+                                )
+                                free_irq(card->irq, card);
+                        for (e1 = card->first_line; e1 < card->first_line +
+                                        card->nports; e1++)
+                                tty_unregister_device(cy_serial_driver, e1);
+                        kfree(card->ports);
+                }
+        }
+
+        put_tty_driver(cy_serial_driver);
+} /* cy_cleanup_module */
+
+module_init(cy_init);
+module_exit(cy_cleanup_module);
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION(CY_VERSION);
+MODULE_ALIAS_CHARDEV_MAJOR(CYCLADES_MAJOR);
+MODULE_FIRMWARE("cyzfirm.bin");
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
new file mode 100644
index 000000000000..6f2c9809f1fb
--- /dev/null
+++ b/drivers/tty/hvc/Kconfig
@@ -0,0 +1,105 @@
+config HVC_DRIVER
+        bool
+        help
+          Generic "hypervisor virtual console" infrastructure for various
+          hypervisors (pSeries, iSeries, Xen, lguest).
+          It will automatically be selected if one of the back-end console drivers
+          is selected.
+
+config HVC_IRQ
+        bool
+
+config HVC_CONSOLE
+        bool "pSeries Hypervisor Virtual Console support"
+        depends on PPC_PSERIES
+        select HVC_DRIVER
+        select HVC_IRQ
+        help
+          pSeries machines when partitioned support a hypervisor virtual
+          console. This driver allows each pSeries partition to have a console
+          which is accessed via the HMC.
+
+config HVC_ISERIES
+        bool "iSeries Hypervisor Virtual Console support"
+        depends on PPC_ISERIES
+        default y
+        select HVC_DRIVER
+        select HVC_IRQ
+        select VIOPATH
+        help
+          iSeries machines support a hypervisor virtual console.
+
+config HVC_RTAS
+        bool "IBM RTAS Console support"
+        depends on PPC_RTAS
+        select HVC_DRIVER
+        help
+          IBM Console device driver which makes use of RTAS
+
+config HVC_BEAT
+        bool "Toshiba's Beat Hypervisor Console support"
+        depends on PPC_CELLEB
+        select HVC_DRIVER
+        help
+          Toshiba's Cell Reference Set Beat Console device driver
+
+config HVC_IUCV
+        bool "z/VM IUCV Hypervisor console support (VM only)"
+        depends on S390
+        select HVC_DRIVER
+        select IUCV
+        default y
+        help
+          This driver provides a Hypervisor console (HVC) back-end to access
+          a Linux (console) terminal via a z/VM IUCV communication path.
+
+config HVC_XEN
+        bool "Xen Hypervisor Console support"
+        depends on XEN
+        select HVC_DRIVER
+        select HVC_IRQ
+        default y
+        help
+          Xen virtual console device driver
+
+config HVC_UDBG
+       bool "udbg based fake hypervisor console"
+       depends on PPC && EXPERIMENTAL
+       select HVC_DRIVER
+       default n
+
+config HVC_DCC
+       bool "ARM JTAG DCC console"
+       depends on ARM
+       select HVC_DRIVER
+       help
+         This console uses the JTAG DCC on ARM to create a console under the HVC
+         driver. This console is used through a JTAG only on ARM. If you don't have
+         a JTAG then you probably don't want this option.
+
+config HVC_BFIN_JTAG
+        bool "Blackfin JTAG console"
+        depends on BLACKFIN
+        select HVC_DRIVER
+        help
+         This console uses the Blackfin JTAG to create a console under the
+         the HVC driver.  If you don't have JTAG, then you probably don't
+         want this option.
+
+config HVCS
+        tristate "IBM Hypervisor Virtual Console Server support"
+        depends on PPC_PSERIES && HVC_CONSOLE
+        help
+          Partitionable IBM Power5 ppc64 machines allow hosting of
+          firmware virtual consoles from one Linux partition by
+          another Linux partition.  This driver allows console data
+          from Linux partitions to be accessed through TTY device
+          interfaces in the device tree of a Linux partition running
+          this driver.
+
+          To compile this driver as a module, choose M here: the
+          module will be called hvcs.  Additionally, this module
+          will depend on arch specific APIs exported from hvcserver.ko
+          which will also be compiled when this driver is built as a
+          module.
+
diff --git a/drivers/tty/hvc/Makefile b/drivers/tty/hvc/Makefile
new file mode 100644
index 000000000000..40a25d93fe52
--- /dev/null
+++ b/drivers/tty/hvc/Makefile
@@ -0,0 +1,13 @@
+obj-$(CONFIG_HVC_CONSOLE)       += hvc_vio.o hvsi.o
+obj-$(CONFIG_HVC_ISERIES)       += hvc_iseries.o
+obj-$(CONFIG_HVC_RTAS)          += hvc_rtas.o
+obj-$(CONFIG_HVC_TILE)          += hvc_tile.o
+obj-$(CONFIG_HVC_DCC)           += hvc_dcc.o
+obj-$(CONFIG_HVC_BEAT)          += hvc_beat.o
+obj-$(CONFIG_HVC_DRIVER)        += hvc_console.o
+obj-$(CONFIG_HVC_IRQ)           += hvc_irq.o
+obj-$(CONFIG_HVC_XEN)           += hvc_xen.o
+obj-$(CONFIG_HVC_IUCV)          += hvc_iucv.o
+obj-$(CONFIG_HVC_UDBG)          += hvc_udbg.o
+obj-$(CONFIG_HVC_BFIN_JTAG)     += hvc_bfin_jtag.o
+obj-$(CONFIG_HVCS)              += hvcs.o
diff --git a/drivers/tty/hvc/hvc_beat.c b/drivers/tty/hvc/hvc_beat.c
new file mode 100644
index 000000000000..5fe4631e2a61
--- /dev/null
+++ b/drivers/tty/hvc/hvc_beat.c
@@ -0,0 +1,134 @@
+/*
+ * Beat hypervisor console driver
+ *
+ * (C) Copyright 2006 TOSHIBA CORPORATION
+ *
+ * This code is based on drivers/char/hvc_rtas.c:
+ * (C) Copyright IBM Corporation 2001-2005
+ * (C) Copyright Red Hat, Inc. 2005
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/console.h>
+#include <asm/prom.h>
+#include <asm/hvconsole.h>
+#include <asm/firmware.h>
+
+#include "hvc_console.h"
+
+extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *);
+extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t);
+
+struct hvc_struct *hvc_beat_dev = NULL;
+
+/* bug: only one queue is available regardless of vtermno */
+static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt)
+{
+        static unsigned char q[sizeof(unsigned long) * 2]
+                __attribute__((aligned(sizeof(unsigned long))));
+        static int qlen = 0;
+        u64 got;
+
+again:
+        if (qlen) {
+                if (qlen > cnt) {
+                        memcpy(buf, q, cnt);
+                        qlen -= cnt;
+                        memmove(q + cnt, q, qlen);
+                        return cnt;
+                } else {        /* qlen <= cnt */
+                        int     r;
+
+                        memcpy(buf, q, qlen);
+                        r = qlen;
+                        qlen = 0;
+                        return r;
+                }
+        }
+        if (beat_get_term_char(vtermno, &got,
+                ((u64 *)q), ((u64 *)q) + 1) == 0) {
+                qlen = got;
+                goto again;
+        }
+        return 0;
+}
+
+static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt)
+{
+        unsigned long kb[2];
+        int rest, nlen;
+
+        for (rest = cnt; rest > 0; rest -= nlen) {
+                nlen = (rest > 16) ? 16 : rest;
+                memcpy(kb, buf, nlen);
+                beat_put_term_char(vtermno, nlen, kb[0], kb[1]);
+                buf += nlen;
+        }
+        return cnt;
+}
+
+static const struct hv_ops hvc_beat_get_put_ops = {
+        .get_chars = hvc_beat_get_chars,
+        .put_chars = hvc_beat_put_chars,
+};
+
+static int hvc_beat_useit = 1;
+
+static int hvc_beat_config(char *p)
+{
+        hvc_beat_useit = simple_strtoul(p, NULL, 0);
+        return 0;
+}
+
+static int __init hvc_beat_console_init(void)
+{
+        if (hvc_beat_useit && of_machine_is_compatible("Beat")) {
+                hvc_instantiate(0, 0, &hvc_beat_get_put_ops);
+        }
+        return 0;
+}
+
+/* temp */
+static int __init hvc_beat_init(void)
+{
+        struct hvc_struct *hp;
+
+        if (!firmware_has_feature(FW_FEATURE_BEAT))
+                return -ENODEV;
+
+        hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16);
+        if (IS_ERR(hp))
+                return PTR_ERR(hp);
+        hvc_beat_dev = hp;
+        return 0;
+}
+
+static void __exit hvc_beat_exit(void)
+{
+        if (hvc_beat_dev)
+                hvc_remove(hvc_beat_dev);
+}
+
+module_init(hvc_beat_init);
+module_exit(hvc_beat_exit);
+
+__setup("hvc_beat=", hvc_beat_config);
+
+console_initcall(hvc_beat_console_init);
diff --git a/drivers/tty/hvc/hvc_bfin_jtag.c b/drivers/tty/hvc/hvc_bfin_jtag.c
new file mode 100644
index 000000000000..31d6cc6a77af
--- /dev/null
+++ b/drivers/tty/hvc/hvc_bfin_jtag.c
@@ -0,0 +1,105 @@
+/*
+ * Console via Blackfin JTAG Communication
+ *
+ * Copyright 2008-2011 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+
+#include "hvc_console.h"
+
+/* See the Debug/Emulation chapter in the HRM */
+#define EMUDOF   0x00000001     /* EMUDAT_OUT full & valid */
+#define EMUDIF   0x00000002     /* EMUDAT_IN full & valid */
+#define EMUDOOVF 0x00000004     /* EMUDAT_OUT overflow */
+#define EMUDIOVF 0x00000008     /* EMUDAT_IN overflow */
+
+/* Helper functions to glue the register API to simple C operations */
+static inline uint32_t bfin_write_emudat(uint32_t emudat)
+{
+        __asm__ __volatile__("emudat = %0;" : : "d"(emudat));
+        return emudat;
+}
+
+static inline uint32_t bfin_read_emudat(void)
+{
+        uint32_t emudat;
+        __asm__ __volatile__("%0 = emudat;" : "=d"(emudat));
+        return emudat;
+}
+
+/* Send data to the host */
+static int hvc_bfin_put_chars(uint32_t vt, const char *buf, int count)
+{
+        static uint32_t outbound_len;
+        uint32_t emudat;
+        int ret;
+
+        if (bfin_read_DBGSTAT() & EMUDOF)
+                return 0;
+
+        if (!outbound_len) {
+                outbound_len = count;
+                bfin_write_emudat(outbound_len);
+                return 0;
+        }
+
+        ret = min(outbound_len, (uint32_t)4);
+        memcpy(&emudat, buf, ret);
+        bfin_write_emudat(emudat);
+        outbound_len -= ret;
+
+        return ret;
+}
+
+/* Receive data from the host */
+static int hvc_bfin_get_chars(uint32_t vt, char *buf, int count)
+{
+        static uint32_t inbound_len;
+        uint32_t emudat;
+        int ret;
+
+        if (!(bfin_read_DBGSTAT() & EMUDIF))
+                return 0;
+        emudat = bfin_read_emudat();
+
+        if (!inbound_len) {
+                inbound_len = emudat;
+                return 0;
+        }
+
+        ret = min(inbound_len, (uint32_t)4);
+        memcpy(buf, &emudat, ret);
+        inbound_len -= ret;
+
+        return ret;
+}
+
+/* Glue the HVC layers to the Blackfin layers */
+static const struct hv_ops hvc_bfin_get_put_ops = {
+        .get_chars = hvc_bfin_get_chars,
+        .put_chars = hvc_bfin_put_chars,
+};
+
+static int __init hvc_bfin_console_init(void)
+{
+        hvc_instantiate(0, 0, &hvc_bfin_get_put_ops);
+        return 0;
+}
+console_initcall(hvc_bfin_console_init);
+
+static int __init hvc_bfin_init(void)
+{
+        hvc_alloc(0, 0, &hvc_bfin_get_put_ops, 128);
+        return 0;
+}
+device_initcall(hvc_bfin_init);
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
new file mode 100644
index 000000000000..e9cba13ee800
--- /dev/null
+++ b/drivers/tty/hvc/hvc_console.c
@@ -0,0 +1,914 @@
+/*
+ * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
+ * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
+ * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
+ * Copyright (C) 2004 IBM Corporation
+ *
+ * Additional Author(s):
+ *  Ryan S. Arnold <rsa@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/console.h>
+#include <linux/cpumask.h>
+#include <linux/init.h>
+#include <linux/kbd_kern.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/major.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <linux/slab.h>
+
+#include <asm/uaccess.h>
+
+#include "hvc_console.h"
+
+#define HVC_MAJOR       229
+#define HVC_MINOR       0
+
+/*
+ * Wait this long per iteration while trying to push buffered data to the
+ * hypervisor before allowing the tty to complete a close operation.
+ */
+#define HVC_CLOSE_WAIT (HZ/100) /* 1/10 of a second */
+
+/*
+ * These sizes are most efficient for vio, because they are the
+ * native transfer size. We could make them selectable in the
+ * future to better deal with backends that want other buffer sizes.
+ */
+#define N_OUTBUF        16
+#define N_INBUF         16
+
+#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
+
+static struct tty_driver *hvc_driver;
+static struct task_struct *hvc_task;
+
+/* Picks up late kicks after list walk but before schedule() */
+static int hvc_kicked;
+
+static int hvc_init(void);
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static int sysrq_pressed;
+#endif
+
+/* dynamic list of hvc_struct instances */
+static LIST_HEAD(hvc_structs);
+
+/*
+ * Protect the list of hvc_struct instances from inserts and removals during
+ * list traversal.
+ */
+static DEFINE_SPINLOCK(hvc_structs_lock);
+
+/*
+ * This value is used to assign a tty->index value to a hvc_struct based
+ * upon order of exposure via hvc_probe(), when we can not match it to
+ * a console candidate registered with hvc_instantiate().
+ */
+static int last_hvc = -1;
+
+/*
+ * Do not call this function with either the hvc_structs_lock or the hvc_struct
+ * lock held.  If successful, this function increments the kref reference
+ * count against the target hvc_struct so it should be released when finished.
+ */
+static struct hvc_struct *hvc_get_by_index(int index)
+{
+        struct hvc_struct *hp;
+        unsigned long flags;
+
+        spin_lock(&hvc_structs_lock);
+
+        list_for_each_entry(hp, &hvc_structs, next) {
+                spin_lock_irqsave(&hp->lock, flags);
+                if (hp->index == index) {
+                        kref_get(&hp->kref);
+                        spin_unlock_irqrestore(&hp->lock, flags);
+                        spin_unlock(&hvc_structs_lock);
+                        return hp;
+                }
+                spin_unlock_irqrestore(&hp->lock, flags);
+        }
+        hp = NULL;
+
+        spin_unlock(&hvc_structs_lock);
+        return hp;
+}
+
+
+/*
+ * Initial console vtermnos for console API usage prior to full console
+ * initialization.  Any vty adapter outside this range will not have usable
+ * console interfaces but can still be used as a tty device.  This has to be
+ * static because kmalloc will not work during early console init.
+ */
+static const struct hv_ops *cons_ops[MAX_NR_HVC_CONSOLES];
+static uint32_t vtermnos[MAX_NR_HVC_CONSOLES] =
+        {[0 ... MAX_NR_HVC_CONSOLES - 1] = -1};
+
+/*
+ * Console APIs, NOT TTY.  These APIs are available immediately when
+ * hvc_console_setup() finds adapters.
+ */
+
+static void hvc_console_print(struct console *co, const char *b,
+                              unsigned count)
+{
+        char c[N_OUTBUF] __ALIGNED__;
+        unsigned i = 0, n = 0;
+        int r, donecr = 0, index = co->index;
+
+        /* Console access attempt outside of acceptable console range. */
+        if (index >= MAX_NR_HVC_CONSOLES)
+                return;
+
+        /* This console adapter was removed so it is not usable. */
+        if (vtermnos[index] == -1)
+                return;
+
+        while (count > 0 || i > 0) {
+                if (count > 0 && i < sizeof(c)) {
+                        if (b[n] == '\n' && !donecr) {
+                                c[i++] = '\r';
+                                donecr = 1;
+                        } else {
+                                c[i++] = b[n++];
+                                donecr = 0;
+                                --count;
+                        }
+                } else {
+                        r = cons_ops[index]->put_chars(vtermnos[index], c, i);
+                        if (r <= 0) {
+                                /* throw away chars on error */
+                                i = 0;
+                        } else if (r > 0) {
+                                i -= r;
+                                if (i > 0)
+                                        memmove(c, c+r, i);
+                        }
+                }
+        }
+}
+
+static struct tty_driver *hvc_console_device(struct console *c, int *index)
+{
+        if (vtermnos[c->index] == -1)
+                return NULL;
+
+        *index = c->index;
+        return hvc_driver;
+}
+
+static int __init hvc_console_setup(struct console *co, char *options)
+{
+        if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
+                return -ENODEV;
+
+        if (vtermnos[co->index] == -1)
+                return -ENODEV;
+
+        return 0;
+}
+
+static struct console hvc_console = {
+        .name           = "hvc",
+        .write          = hvc_console_print,
+        .device         = hvc_console_device,
+        .setup          = hvc_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+};
+
+/*
+ * Early console initialization.  Precedes driver initialization.
+ *
+ * (1) we are first, and the user specified another driver
+ * -- index will remain -1
+ * (2) we are first and the user specified no driver
+ * -- index will be set to 0, then we will fail setup.
+ * (3)  we are first and the user specified our driver
+ * -- index will be set to user specified driver, and we will fail
+ * (4) we are after driver, and this initcall will register us
+ * -- if the user didn't specify a driver then the console will match
+ *
+ * Note that for cases 2 and 3, we will match later when the io driver
+ * calls hvc_instantiate() and call register again.
+ */
+static int __init hvc_console_init(void)
+{
+        register_console(&hvc_console);
+        return 0;
+}
+console_initcall(hvc_console_init);
+
+/* callback when the kboject ref count reaches zero. */
+static void destroy_hvc_struct(struct kref *kref)
+{
+        struct hvc_struct *hp = container_of(kref, struct hvc_struct, kref);
+        unsigned long flags;
+
+        spin_lock(&hvc_structs_lock);
+
+        spin_lock_irqsave(&hp->lock, flags);
+        list_del(&(hp->next));
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        spin_unlock(&hvc_structs_lock);
+
+        kfree(hp);
+}
+
+/*
+ * hvc_instantiate() is an early console discovery method which locates
+ * consoles * prior to the vio subsystem discovering them.  Hotplugged
+ * vty adapters do NOT get an hvc_instantiate() callback since they
+ * appear after early console init.
+ */
+int hvc_instantiate(uint32_t vtermno, int index, const struct hv_ops *ops)
+{
+        struct hvc_struct *hp;
+
+        if (index < 0 || index >= MAX_NR_HVC_CONSOLES)
+                return -1;
+
+        if (vtermnos[index] != -1)
+                return -1;
+
+        /* make sure no no tty has been registered in this index */
+        hp = hvc_get_by_index(index);
+        if (hp) {
+                kref_put(&hp->kref, destroy_hvc_struct);
+                return -1;
+        }
+
+        vtermnos[index] = vtermno;
+        cons_ops[index] = ops;
+
+        /* reserve all indices up to and including this index */
+        if (last_hvc < index)
+                last_hvc = index;
+
+        /* if this index is what the user requested, then register
+         * now (setup won't fail at this point).  It's ok to just
+         * call register again if previously .setup failed.
+         */
+        if (index == hvc_console.index)
+                register_console(&hvc_console);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(hvc_instantiate);
+
+/* Wake the sleeping khvcd */
+void hvc_kick(void)
+{
+        hvc_kicked = 1;
+        wake_up_process(hvc_task);
+}
+EXPORT_SYMBOL_GPL(hvc_kick);
+
+static void hvc_unthrottle(struct tty_struct *tty)
+{
+        hvc_kick();
+}
+
+/*
+ * The TTY interface won't be used until after the vio layer has exposed the vty
+ * adapter to the kernel.
+ */
+static int hvc_open(struct tty_struct *tty, struct file * filp)
+{
+        struct hvc_struct *hp;
+        unsigned long flags;
+        int rc = 0;
+
+        /* Auto increments kref reference if found. */
+        if (!(hp = hvc_get_by_index(tty->index)))
+                return -ENODEV;
+
+        spin_lock_irqsave(&hp->lock, flags);
+        /* Check and then increment for fast path open. */
+        if (hp->count++ > 0) {
+                tty_kref_get(tty);
+                spin_unlock_irqrestore(&hp->lock, flags);
+                hvc_kick();
+                return 0;
+        } /* else count == 0 */
+
+        tty->driver_data = hp;
+
+        hp->tty = tty_kref_get(tty);
+
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        if (hp->ops->notifier_add)
+                rc = hp->ops->notifier_add(hp, hp->data);
+
+        /*
+         * If the notifier fails we return an error.  The tty layer
+         * will call hvc_close() after a failed open but we don't want to clean
+         * up there so we'll clean up here and clear out the previously set
+         * tty fields and return the kref reference.
+         */
+        if (rc) {
+                spin_lock_irqsave(&hp->lock, flags);
+                hp->tty = NULL;
+                spin_unlock_irqrestore(&hp->lock, flags);
+                tty_kref_put(tty);
+                tty->driver_data = NULL;
+                kref_put(&hp->kref, destroy_hvc_struct);
+                printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
+        }
+        /* Force wakeup of the polling thread */
+        hvc_kick();
+
+        return rc;
+}
+
+static void hvc_close(struct tty_struct *tty, struct file * filp)
+{
+        struct hvc_struct *hp;
+        unsigned long flags;
+
+        if (tty_hung_up_p(filp))
+                return;
+
+        /*
+         * No driver_data means that this close was issued after a failed
+         * hvc_open by the tty layer's release_dev() function and we can just
+         * exit cleanly because the kref reference wasn't made.
+         */
+        if (!tty->driver_data)
+                return;
+
+        hp = tty->driver_data;
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        if (--hp->count == 0) {
+                /* We are done with the tty pointer now. */
+                hp->tty = NULL;
+                spin_unlock_irqrestore(&hp->lock, flags);
+
+                if (hp->ops->notifier_del)
+                        hp->ops->notifier_del(hp, hp->data);
+
+                /* cancel pending tty resize work */
+                cancel_work_sync(&hp->tty_resize);
+
+                /*
+                 * Chain calls chars_in_buffer() and returns immediately if
+                 * there is no buffered data otherwise sleeps on a wait queue
+                 * waking periodically to check chars_in_buffer().
+                 */
+                tty_wait_until_sent(tty, HVC_CLOSE_WAIT);
+        } else {
+                if (hp->count < 0)
+                        printk(KERN_ERR "hvc_close %X: oops, count is %d\n",
+                                hp->vtermno, hp->count);
+                spin_unlock_irqrestore(&hp->lock, flags);
+        }
+
+        tty_kref_put(tty);
+        kref_put(&hp->kref, destroy_hvc_struct);
+}
+
+static void hvc_hangup(struct tty_struct *tty)
+{
+        struct hvc_struct *hp = tty->driver_data;
+        unsigned long flags;
+        int temp_open_count;
+
+        if (!hp)
+                return;
+
+        /* cancel pending tty resize work */
+        cancel_work_sync(&hp->tty_resize);
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        /*
+         * The N_TTY line discipline has problems such that in a close vs
+         * open->hangup case this can be called after the final close so prevent
+         * that from happening for now.
+         */
+        if (hp->count <= 0) {
+                spin_unlock_irqrestore(&hp->lock, flags);
+                return;
+        }
+
+        temp_open_count = hp->count;
+        hp->count = 0;
+        hp->n_outbuf = 0;
+        hp->tty = NULL;
+
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        if (hp->ops->notifier_hangup)
+                hp->ops->notifier_hangup(hp, hp->data);
+
+        while(temp_open_count) {
+                --temp_open_count;
+                tty_kref_put(tty);
+                kref_put(&hp->kref, destroy_hvc_struct);
+        }
+}
+
+/*
+ * Push buffered characters whether they were just recently buffered or waiting
+ * on a blocked hypervisor.  Call this function with hp->lock held.
+ */
+static int hvc_push(struct hvc_struct *hp)
+{
+        int n;
+
+        n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
+        if (n <= 0) {
+                if (n == 0) {
+                        hp->do_wakeup = 1;
+                        return 0;
+                }
+                /* throw away output on error; this happens when
+                   there is no session connected to the vterm. */
+                hp->n_outbuf = 0;
+        } else
+                hp->n_outbuf -= n;
+        if (hp->n_outbuf > 0)
+                memmove(hp->outbuf, hp->outbuf + n, hp->n_outbuf);
+        else
+                hp->do_wakeup = 1;
+
+        return n;
+}
+
+static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+        struct hvc_struct *hp = tty->driver_data;
+        unsigned long flags;
+        int rsize, written = 0;
+
+        /* This write was probably executed during a tty close. */
+        if (!hp)
+                return -EPIPE;
+
+        if (hp->count <= 0)
+                return -EIO;
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        /* Push pending writes */
+        if (hp->n_outbuf > 0)
+                hvc_push(hp);
+
+        while (count > 0 && (rsize = hp->outbuf_size - hp->n_outbuf) > 0) {
+                if (rsize > count)
+                        rsize = count;
+                memcpy(hp->outbuf + hp->n_outbuf, buf, rsize);
+                count -= rsize;
+                buf += rsize;
+                hp->n_outbuf += rsize;
+                written += rsize;
+                hvc_push(hp);
+        }
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        /*
+         * Racy, but harmless, kick thread if there is still pending data.
+         */
+        if (hp->n_outbuf)
+                hvc_kick();
+
+        return written;
+}
+
+/**
+ * hvc_set_winsz() - Resize the hvc tty terminal window.
+ * @work:       work structure.
+ *
+ * The routine shall not be called within an atomic context because it
+ * might sleep.
+ *
+ * Locking:     hp->lock
+ */
+static void hvc_set_winsz(struct work_struct *work)
+{
+        struct hvc_struct *hp;
+        unsigned long hvc_flags;
+        struct tty_struct *tty;
+        struct winsize ws;
+
+        hp = container_of(work, struct hvc_struct, tty_resize);
+
+        spin_lock_irqsave(&hp->lock, hvc_flags);
+        if (!hp->tty) {
+                spin_unlock_irqrestore(&hp->lock, hvc_flags);
+                return;
+        }
+        ws  = hp->ws;
+        tty = tty_kref_get(hp->tty);
+        spin_unlock_irqrestore(&hp->lock, hvc_flags);
+
+        tty_do_resize(tty, &ws);
+        tty_kref_put(tty);
+}
+
+/*
+ * This is actually a contract between the driver and the tty layer outlining
+ * how much write room the driver can guarantee will be sent OR BUFFERED.  This
+ * driver MUST honor the return value.
+ */
+static int hvc_write_room(struct tty_struct *tty)
+{
+        struct hvc_struct *hp = tty->driver_data;
+
+        if (!hp)
+                return -1;
+
+        return hp->outbuf_size - hp->n_outbuf;
+}
+
+static int hvc_chars_in_buffer(struct tty_struct *tty)
+{
+        struct hvc_struct *hp = tty->driver_data;
+
+        if (!hp)
+                return 0;
+        return hp->n_outbuf;
+}
+
+/*
+ * timeout will vary between the MIN and MAX values defined here.  By default
+ * and during console activity we will use a default MIN_TIMEOUT of 10.  When
+ * the console is idle, we increase the timeout value on each pass through
+ * msleep until we reach the max.  This may be noticeable as a brief (average
+ * one second) delay on the console before the console responds to input when
+ * there has been no input for some time.
+ */
+#define MIN_TIMEOUT             (10)
+#define MAX_TIMEOUT             (2000)
+static u32 timeout = MIN_TIMEOUT;
+
+#define HVC_POLL_READ   0x00000001
+#define HVC_POLL_WRITE  0x00000002
+
+int hvc_poll(struct hvc_struct *hp)
+{
+        struct tty_struct *tty;
+        int i, n, poll_mask = 0;
+        char buf[N_INBUF] __ALIGNED__;
+        unsigned long flags;
+        int read_total = 0;
+        int written_total = 0;
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        /* Push pending writes */
+        if (hp->n_outbuf > 0)
+                written_total = hvc_push(hp);
+
+        /* Reschedule us if still some write pending */
+        if (hp->n_outbuf > 0) {
+                poll_mask |= HVC_POLL_WRITE;
+                /* If hvc_push() was not able to write, sleep a few msecs */
+                timeout = (written_total) ? 0 : MIN_TIMEOUT;
+        }
+
+        /* No tty attached, just skip */
+        tty = tty_kref_get(hp->tty);
+        if (tty == NULL)
+                goto bail;
+
+        /* Now check if we can get data (are we throttled ?) */
+        if (test_bit(TTY_THROTTLED, &tty->flags))
+                goto throttled;
+
+        /* If we aren't notifier driven and aren't throttled, we always
+         * request a reschedule
+         */
+        if (!hp->irq_requested)
+                poll_mask |= HVC_POLL_READ;
+
+        /* Read data if any */
+        for (;;) {
+                int count = tty_buffer_request_room(tty, N_INBUF);
+
+                /* If flip is full, just reschedule a later read */
+                if (count == 0) {
+                        poll_mask |= HVC_POLL_READ;
+                        break;
+                }
+
+                n = hp->ops->get_chars(hp->vtermno, buf, count);
+                if (n <= 0) {
+                        /* Hangup the tty when disconnected from host */
+                        if (n == -EPIPE) {
+                                spin_unlock_irqrestore(&hp->lock, flags);
+                                tty_hangup(tty);
+                                spin_lock_irqsave(&hp->lock, flags);
+                        } else if ( n == -EAGAIN ) {
+                                /*
+                                 * Some back-ends can only ensure a certain min
+                                 * num of bytes read, which may be > 'count'.
+                                 * Let the tty clear the flip buff to make room.
+                                 */
+                                poll_mask |= HVC_POLL_READ;
+                        }
+                        break;
+                }
+                for (i = 0; i < n; ++i) {
+#ifdef CONFIG_MAGIC_SYSRQ
+                        if (hp->index == hvc_console.index) {
+                                /* Handle the SysRq Hack */
+                                /* XXX should support a sequence */
+                                if (buf[i] == '\x0f') { /* ^O */
+                                        /* if ^O is pressed again, reset
+                                         * sysrq_pressed and flip ^O char */
+                                        sysrq_pressed = !sysrq_pressed;
+                                        if (sysrq_pressed)
+                                                continue;
+                                } else if (sysrq_pressed) {
+                                        handle_sysrq(buf[i]);
+                                        sysrq_pressed = 0;
+                                        continue;
+                                }
+                        }
+#endif /* CONFIG_MAGIC_SYSRQ */
+                        tty_insert_flip_char(tty, buf[i], 0);
+                }
+
+                read_total += n;
+        }
+ throttled:
+        /* Wakeup write queue if necessary */
+        if (hp->do_wakeup) {
+                hp->do_wakeup = 0;
+                tty_wakeup(tty);
+        }
+ bail:
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        if (read_total) {
+                /* Activity is occurring, so reset the polling backoff value to
+                   a minimum for performance. */
+                timeout = MIN_TIMEOUT;
+
+                tty_flip_buffer_push(tty);
+        }
+        if (tty)
+                tty_kref_put(tty);
+
+        return poll_mask;
+}
+EXPORT_SYMBOL_GPL(hvc_poll);
+
+/**
+ * __hvc_resize() - Update terminal window size information.
+ * @hp:         HVC console pointer
+ * @ws:         Terminal window size structure
+ *
+ * Stores the specified window size information in the hvc structure of @hp.
+ * The function schedule the tty resize update.
+ *
+ * Locking:     Locking free; the function MUST be called holding hp->lock
+ */
+void __hvc_resize(struct hvc_struct *hp, struct winsize ws)
+{
+        hp->ws = ws;
+        schedule_work(&hp->tty_resize);
+}
+EXPORT_SYMBOL_GPL(__hvc_resize);
+
+/*
+ * This kthread is either polling or interrupt driven.  This is determined by
+ * calling hvc_poll() who determines whether a console adapter support
+ * interrupts.
+ */
+static int khvcd(void *unused)
+{
+        int poll_mask;
+        struct hvc_struct *hp;
+
+        set_freezable();
+        do {
+                poll_mask = 0;
+                hvc_kicked = 0;
+                try_to_freeze();
+                wmb();
+                if (!cpus_are_in_xmon()) {
+                        spin_lock(&hvc_structs_lock);
+                        list_for_each_entry(hp, &hvc_structs, next) {
+                                poll_mask |= hvc_poll(hp);
+                        }
+                        spin_unlock(&hvc_structs_lock);
+                } else
+                        poll_mask |= HVC_POLL_READ;
+                if (hvc_kicked)
+                        continue;
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (!hvc_kicked) {
+                        if (poll_mask == 0)
+                                schedule();
+                        else {
+                                if (timeout < MAX_TIMEOUT)
+                                        timeout += (timeout >> 6) + 1;
+
+                                msleep_interruptible(timeout);
+                        }
+                }
+                __set_current_state(TASK_RUNNING);
+        } while (!kthread_should_stop());
+
+        return 0;
+}
+
+static const struct tty_operations hvc_ops = {
+        .open = hvc_open,
+        .close = hvc_close,
+        .write = hvc_write,
+        .hangup = hvc_hangup,
+        .unthrottle = hvc_unthrottle,
+        .write_room = hvc_write_room,
+        .chars_in_buffer = hvc_chars_in_buffer,
+};
+
+struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
+                             const struct hv_ops *ops,
+                             int outbuf_size)
+{
+        struct hvc_struct *hp;
+        int i;
+
+        /* We wait until a driver actually comes along */
+        if (!hvc_driver) {
+                int err = hvc_init();
+                if (err)
+                        return ERR_PTR(err);
+        }
+
+        hp = kzalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
+                        GFP_KERNEL);
+        if (!hp)
+                return ERR_PTR(-ENOMEM);
+
+        hp->vtermno = vtermno;
+        hp->data = data;
+        hp->ops = ops;
+        hp->outbuf_size = outbuf_size;
+        hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
+
+        kref_init(&hp->kref);
+
+        INIT_WORK(&hp->tty_resize, hvc_set_winsz);
+        spin_lock_init(&hp->lock);
+        spin_lock(&hvc_structs_lock);
+
+        /*
+         * find index to use:
+         * see if this vterm id matches one registered for console.
+         */
+        for (i=0; i < MAX_NR_HVC_CONSOLES; i++)
+                if (vtermnos[i] == hp->vtermno &&
+                    cons_ops[i] == hp->ops)
+                        break;
+
+        /* no matching slot, just use a counter */
+        if (i >= MAX_NR_HVC_CONSOLES)
+                i = ++last_hvc;
+
+        hp->index = i;
+
+        list_add_tail(&(hp->next), &hvc_structs);
+        spin_unlock(&hvc_structs_lock);
+
+        return hp;
+}
+EXPORT_SYMBOL_GPL(hvc_alloc);
+
+int hvc_remove(struct hvc_struct *hp)
+{
+        unsigned long flags;
+        struct tty_struct *tty;
+
+        spin_lock_irqsave(&hp->lock, flags);
+        tty = tty_kref_get(hp->tty);
+
+        if (hp->index < MAX_NR_HVC_CONSOLES)
+                vtermnos[hp->index] = -1;
+
+        /* Don't whack hp->irq because tty_hangup() will need to free the irq. */
+
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        /*
+         * We 'put' the instance that was grabbed when the kref instance
+         * was initialized using kref_init().  Let the last holder of this
+         * kref cause it to be removed, which will probably be the tty_vhangup
+         * below.
+         */
+        kref_put(&hp->kref, destroy_hvc_struct);
+
+        /*
+         * This function call will auto chain call hvc_hangup.
+         */
+        if (tty) {
+                tty_vhangup(tty);
+                tty_kref_put(tty);
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(hvc_remove);
+
+/* Driver initialization: called as soon as someone uses hvc_alloc(). */
+static int hvc_init(void)
+{
+        struct tty_driver *drv;
+        int err;
+
+        /* We need more than hvc_count adapters due to hotplug additions. */
+        drv = alloc_tty_driver(HVC_ALLOC_TTY_ADAPTERS);
+        if (!drv) {
+                err = -ENOMEM;
+                goto out;
+        }
+
+        drv->owner = THIS_MODULE;
+        drv->driver_name = "hvc";
+        drv->name = "hvc";
+        drv->major = HVC_MAJOR;
+        drv->minor_start = HVC_MINOR;
+        drv->type = TTY_DRIVER_TYPE_SYSTEM;
+        drv->init_termios = tty_std_termios;
+        drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
+        tty_set_operations(drv, &hvc_ops);
+
+        /* Always start the kthread because there can be hotplug vty adapters
+         * added later. */
+        hvc_task = kthread_run(khvcd, NULL, "khvcd");
+        if (IS_ERR(hvc_task)) {
+                printk(KERN_ERR "Couldn't create kthread for console.\n");
+                err = PTR_ERR(hvc_task);
+                goto put_tty;
+        }
+
+        err = tty_register_driver(drv);
+        if (err) {
+                printk(KERN_ERR "Couldn't register hvc console driver\n");
+                goto stop_thread;
+        }
+
+        /*
+         * Make sure tty is fully registered before allowing it to be
+         * found by hvc_console_device.
+         */
+        smp_mb();
+        hvc_driver = drv;
+        return 0;
+
+stop_thread:
+        kthread_stop(hvc_task);
+        hvc_task = NULL;
+put_tty:
+        put_tty_driver(drv);
+out:
+        return err;
+}
+
+/* This isn't particularly necessary due to this being a console driver
+ * but it is nice to be thorough.
+ */
+static void __exit hvc_exit(void)
+{
+        if (hvc_driver) {
+                kthread_stop(hvc_task);
+
+                tty_unregister_driver(hvc_driver);
+                /* return tty_struct instances allocated in hvc_init(). */
+                put_tty_driver(hvc_driver);
+                unregister_console(&hvc_console);
+        }
+}
+module_exit(hvc_exit);
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h
new file mode 100644
index 000000000000..54381eba4e4a
--- /dev/null
+++ b/drivers/tty/hvc/hvc_console.h
@@ -0,0 +1,119 @@
+/*
+ * hvc_console.h
+ * Copyright (C) 2005 IBM Corporation
+ *
+ * Author(s):
+ *      Ryan S. Arnold <rsa@us.ibm.com>
+ *
+ * hvc_console header information:
+ *      moved here from arch/powerpc/include/asm/hvconsole.h
+ *      and drivers/char/hvc_console.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#ifndef HVC_CONSOLE_H
+#define HVC_CONSOLE_H
+#include <linux/kref.h>
+#include <linux/tty.h>
+#include <linux/spinlock.h>
+
+/*
+ * This is the max number of console adapters that can/will be found as
+ * console devices on first stage console init.  Any number beyond this range
+ * can't be used as a console device but is still a valid tty device.
+ */
+#define MAX_NR_HVC_CONSOLES     16
+
+/*
+ * The Linux TTY code does not support dynamic addition of tty derived devices
+ * so we need to know how many tty devices we might need when space is allocated
+ * for the tty device.  Since this driver supports hotplug of vty adapters we
+ * need to make sure we have enough allocated.
+ */
+#define HVC_ALLOC_TTY_ADAPTERS  8
+
+struct hvc_struct {
+        spinlock_t lock;
+        int index;
+        struct tty_struct *tty;
+        int count;
+        int do_wakeup;
+        char *outbuf;
+        int outbuf_size;
+        int n_outbuf;
+        uint32_t vtermno;
+        const struct hv_ops *ops;
+        int irq_requested;
+        int data;
+        struct winsize ws;
+        struct work_struct tty_resize;
+        struct list_head next;
+        struct kref kref; /* ref count & hvc_struct lifetime */
+};
+
+/* implemented by a low level driver */
+struct hv_ops {
+        int (*get_chars)(uint32_t vtermno, char *buf, int count);
+        int (*put_chars)(uint32_t vtermno, const char *buf, int count);
+
+        /* Callbacks for notification. Called in open, close and hangup */
+        int (*notifier_add)(struct hvc_struct *hp, int irq);
+        void (*notifier_del)(struct hvc_struct *hp, int irq);
+        void (*notifier_hangup)(struct hvc_struct *hp, int irq);
+};
+
+/* Register a vterm and a slot index for use as a console (console_init) */
+extern int hvc_instantiate(uint32_t vtermno, int index,
+                           const struct hv_ops *ops);
+
+/* register a vterm for hvc tty operation (module_init or hotplug add) */
+extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data,
+                                     const struct hv_ops *ops, int outbuf_size);
+/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
+extern int hvc_remove(struct hvc_struct *hp);
+
+/* data available */
+int hvc_poll(struct hvc_struct *hp);
+void hvc_kick(void);
+
+/* Resize hvc tty terminal window */
+extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws);
+
+static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&hp->lock, flags);
+        __hvc_resize(hp, ws);
+        spin_unlock_irqrestore(&hp->lock, flags);
+}
+
+/* default notifier for irq based notification */
+extern int notifier_add_irq(struct hvc_struct *hp, int data);
+extern void notifier_del_irq(struct hvc_struct *hp, int data);
+extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
+
+
+#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
+#include <asm/xmon.h>
+#else
+static inline int cpus_are_in_xmon(void)
+{
+        return 0;
+}
+#endif
+
+#endif // HVC_CONSOLE_H
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
new file mode 100644
index 000000000000..435f6facbc23
--- /dev/null
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -0,0 +1,104 @@
+/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+
+#include <asm/processor.h>
+
+#include "hvc_console.h"
+
+/* DCC Status Bits */
+#define DCC_STATUS_RX           (1 << 30)
+#define DCC_STATUS_TX           (1 << 29)
+
+static inline u32 __dcc_getstatus(void)
+{
+        u32 __ret;
+        asm volatile("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
+                : "=r" (__ret) : : "cc");
+
+        return __ret;
+}
+
+
+static inline char __dcc_getchar(void)
+{
+        char __c;
+
+        asm volatile("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
+                : "=r" (__c));
+
+        return __c;
+}
+
+static inline void __dcc_putchar(char c)
+{
+        asm volatile("mcr p14, 0, %0, c0, c5, 0 @ write a char"
+                : /* no output register */
+                : "r" (c));
+}
+
+static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
+{
+        int i;
+
+        for (i = 0; i < count; i++) {
+                while (__dcc_getstatus() & DCC_STATUS_TX)
+                        cpu_relax();
+
+                __dcc_putchar(buf[i]);
+        }
+
+        return count;
+}
+
+static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count)
+{
+        int i;
+
+        for (i = 0; i < count; ++i)
+                if (__dcc_getstatus() & DCC_STATUS_RX)
+                        buf[i] = __dcc_getchar();
+                else
+                        break;
+
+        return i;
+}
+
+static const struct hv_ops hvc_dcc_get_put_ops = {
+        .get_chars = hvc_dcc_get_chars,
+        .put_chars = hvc_dcc_put_chars,
+};
+
+static int __init hvc_dcc_console_init(void)
+{
+        hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
+        return 0;
+}
+console_initcall(hvc_dcc_console_init);
+
+static int __init hvc_dcc_init(void)
+{
+        hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
+        return 0;
+}
+device_initcall(hvc_dcc_init);
diff --git a/drivers/tty/hvc/hvc_irq.c b/drivers/tty/hvc/hvc_irq.c
new file mode 100644
index 000000000000..2623e177e8d6
--- /dev/null
+++ b/drivers/tty/hvc/hvc_irq.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright IBM Corp. 2001,2008
+ *
+ * This file contains the IRQ specific code for hvc_console
+ *
+ */
+
+#include <linux/interrupt.h>
+
+#include "hvc_console.h"
+
+static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance)
+{
+        /* if hvc_poll request a repoll, then kick the hvcd thread */
+        if (hvc_poll(dev_instance))
+                hvc_kick();
+        return IRQ_HANDLED;
+}
+
+/*
+ * For IRQ based systems these callbacks can be used
+ */
+int notifier_add_irq(struct hvc_struct *hp, int irq)
+{
+        int rc;
+
+        if (!irq) {
+                hp->irq_requested = 0;
+                return 0;
+        }
+        rc = request_irq(irq, hvc_handle_interrupt, IRQF_DISABLED,
+                           "hvc_console", hp);
+        if (!rc)
+                hp->irq_requested = 1;
+        return rc;
+}
+
+void notifier_del_irq(struct hvc_struct *hp, int irq)
+{
+        if (!hp->irq_requested)
+                return;
+        free_irq(irq, hp);
+        hp->irq_requested = 0;
+}
+
+void notifier_hangup_irq(struct hvc_struct *hp, int irq)
+{
+        notifier_del_irq(hp, irq);
+}
diff --git a/drivers/tty/hvc/hvc_iseries.c b/drivers/tty/hvc/hvc_iseries.c
new file mode 100644
index 000000000000..21c54955084e
--- /dev/null
+++ b/drivers/tty/hvc/hvc_iseries.c
@@ -0,0 +1,598 @@
+/*
+ * iSeries vio driver interface to hvc_console.c
+ *
+ * This code is based heavily on hvc_vio.c and viocons.c
+ *
+ * Copyright (C) 2006 Stephen Rothwell, IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+#include <stdarg.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/console.h>
+
+#include <asm/hvconsole.h>
+#include <asm/vio.h>
+#include <asm/prom.h>
+#include <asm/firmware.h>
+#include <asm/iseries/vio.h>
+#include <asm/iseries/hv_call.h>
+#include <asm/iseries/hv_lp_config.h>
+#include <asm/iseries/hv_lp_event.h>
+
+#include "hvc_console.h"
+
+#define VTTY_PORTS 10
+
+static DEFINE_SPINLOCK(consolelock);
+static DEFINE_SPINLOCK(consoleloglock);
+
+static const char hvc_driver_name[] = "hvc_console";
+
+#define IN_BUF_SIZE     200
+
+/*
+ * Our port information.
+ */
+static struct port_info {
+        HvLpIndex lp;
+        u64 seq;        /* sequence number of last HV send */
+        u64 ack;        /* last ack from HV */
+        struct hvc_struct *hp;
+        int in_start;
+        int in_end;
+        unsigned char in_buf[IN_BUF_SIZE];
+} port_info[VTTY_PORTS] = {
+        [ 0 ... VTTY_PORTS - 1 ] = {
+                .lp = HvLpIndexInvalid
+        }
+};
+
+#define viochar_is_console(pi)  ((pi) == &port_info[0])
+
+static struct vio_device_id hvc_driver_table[] __devinitdata = {
+        {"serial", "IBM,iSeries-vty"},
+        { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, hvc_driver_table);
+
+static void hvlog(char *fmt, ...)
+{
+        int i;
+        unsigned long flags;
+        va_list args;
+        static char buf[256];
+
+        spin_lock_irqsave(&consoleloglock, flags);
+        va_start(args, fmt);
+        i = vscnprintf(buf, sizeof(buf) - 1, fmt, args);
+        va_end(args);
+        buf[i++] = '\r';
+        HvCall_writeLogBuffer(buf, i);
+        spin_unlock_irqrestore(&consoleloglock, flags);
+}
+
+/*
+ * Initialize the common fields in a charLpEvent
+ */
+static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp)
+{
+        struct HvLpEvent *hev = &viochar->event;
+
+        memset(viochar, 0, sizeof(struct viocharlpevent));
+
+        hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK |
+                HV_LP_EVENT_INT;
+        hev->xType = HvLpEvent_Type_VirtualIo;
+        hev->xSubtype = viomajorsubtype_chario | viochardata;
+        hev->xSourceLp = HvLpConfig_getLpIndex();
+        hev->xTargetLp = lp;
+        hev->xSizeMinus1 = sizeof(struct viocharlpevent);
+        hev->xSourceInstanceId = viopath_sourceinst(lp);
+        hev->xTargetInstanceId = viopath_targetinst(lp);
+}
+
+static int get_chars(uint32_t vtermno, char *buf, int count)
+{
+        struct port_info *pi;
+        int n = 0;
+        unsigned long flags;
+
+        if (vtermno >= VTTY_PORTS)
+                return -EINVAL;
+        if (count == 0)
+                return 0;
+
+        pi = &port_info[vtermno];
+        spin_lock_irqsave(&consolelock, flags);
+
+        if (pi->in_end == 0)
+                goto done;
+
+        n = pi->in_end - pi->in_start;
+        if (n > count)
+                n = count;
+        memcpy(buf, &pi->in_buf[pi->in_start], n);
+        pi->in_start += n;
+        if (pi->in_start == pi->in_end) {
+                pi->in_start = 0;
+                pi->in_end = 0;
+        }
+done:
+        spin_unlock_irqrestore(&consolelock, flags);
+        return n;
+}
+
+static int put_chars(uint32_t vtermno, const char *buf, int count)
+{
+        struct viocharlpevent *viochar;
+        struct port_info *pi;
+        HvLpEvent_Rc hvrc;
+        unsigned long flags;
+        int sent = 0;
+
+        if (vtermno >= VTTY_PORTS)
+                return -EINVAL;
+
+        pi = &port_info[vtermno];
+
+        spin_lock_irqsave(&consolelock, flags);
+
+        if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) {
+                HvCall_writeLogBuffer(buf, count);
+                sent = count;
+                goto done;
+        }
+
+        viochar = vio_get_event_buffer(viomajorsubtype_chario);
+        if (viochar == NULL) {
+                hvlog("\n\rviocons: Can't get viochar buffer.");
+                goto done;
+        }
+
+        while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) {
+                int len;
+
+                len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count;
+
+                if (viochar_is_console(pi))
+                        HvCall_writeLogBuffer(buf, len);
+
+                init_data_event(viochar, pi->lp);
+
+                viochar->len = len;
+                viochar->event.xCorrelationToken = pi->seq++;
+                viochar->event.xSizeMinus1 =
+                        offsetof(struct viocharlpevent, data) + len;
+
+                memcpy(viochar->data, buf, len);
+
+                hvrc = HvCallEvent_signalLpEvent(&viochar->event);
+                if (hvrc)
+                        hvlog("\n\rerror sending event! return code %d\n\r",
+                                (int)hvrc);
+                sent += len;
+                count -= len;
+                buf += len;
+        }
+
+        vio_free_event_buffer(viomajorsubtype_chario, viochar);
+done:
+        spin_unlock_irqrestore(&consolelock, flags);
+        return sent;
+}
+
+static const struct hv_ops hvc_get_put_ops = {
+        .get_chars = get_chars,
+        .put_chars = put_chars,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
+        .notifier_hangup = notifier_hangup_irq,
+};
+
+static int __devinit hvc_vio_probe(struct vio_dev *vdev,
+                        const struct vio_device_id *id)
+{
+        struct hvc_struct *hp;
+        struct port_info *pi;
+
+        /* probed with invalid parameters. */
+        if (!vdev || !id)
+                return -EPERM;
+
+        if (vdev->unit_address >= VTTY_PORTS)
+                return -ENODEV;
+
+        pi = &port_info[vdev->unit_address];
+
+        hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
+                        VIOCHAR_MAX_DATA);
+        if (IS_ERR(hp))
+                return PTR_ERR(hp);
+        pi->hp = hp;
+        dev_set_drvdata(&vdev->dev, pi);
+
+        return 0;
+}
+
+static int __devexit hvc_vio_remove(struct vio_dev *vdev)
+{
+        struct port_info *pi = dev_get_drvdata(&vdev->dev);
+        struct hvc_struct *hp = pi->hp;
+
+        return hvc_remove(hp);
+}
+
+static struct vio_driver hvc_vio_driver = {
+        .id_table       = hvc_driver_table,
+        .probe          = hvc_vio_probe,
+        .remove         = __devexit_p(hvc_vio_remove),
+        .driver         = {
+                .name   = hvc_driver_name,
+                .owner  = THIS_MODULE,
+        }
+};
+
+static void hvc_open_event(struct HvLpEvent *event)
+{
+        unsigned long flags;
+        struct viocharlpevent *cevent = (struct viocharlpevent *)event;
+        u8 port = cevent->virtual_device;
+        struct port_info *pi;
+        int reject = 0;
+
+        if (hvlpevent_is_ack(event)) {
+                if (port >= VTTY_PORTS)
+                        return;
+
+                spin_lock_irqsave(&consolelock, flags);
+
+                pi = &port_info[port];
+                if (event->xRc == HvLpEvent_Rc_Good) {
+                        pi->seq = pi->ack = 0;
+                        /*
+                         * This line allows connections from the primary
+                         * partition but once one is connected from the
+                         * primary partition nothing short of a reboot
+                         * of linux will allow access from the hosting
+                         * partition again without a required iSeries fix.
+                         */
+                        pi->lp = event->xTargetLp;
+                }
+
+                spin_unlock_irqrestore(&consolelock, flags);
+                if (event->xRc != HvLpEvent_Rc_Good)
+                        printk(KERN_WARNING
+                               "hvc: handle_open_event: event->xRc == (%d).\n",
+                               event->xRc);
+
+                if (event->xCorrelationToken != 0) {
+                        atomic_t *aptr= (atomic_t *)event->xCorrelationToken;
+                        atomic_set(aptr, 1);
+                } else
+                        printk(KERN_WARNING
+                               "hvc: weird...got open ack without atomic\n");
+                return;
+        }
+
+        /* This had better require an ack, otherwise complain */
+        if (!hvlpevent_need_ack(event)) {
+                printk(KERN_WARNING "hvc: viocharopen without ack bit!\n");
+                return;
+        }
+
+        spin_lock_irqsave(&consolelock, flags);
+
+        /* Make sure this is a good virtual tty */
+        if (port >= VTTY_PORTS) {
+                event->xRc = HvLpEvent_Rc_SubtypeError;
+                cevent->subtype_result_code = viorc_openRejected;
+                /*
+                 * Flag state here since we can't printk while holding
+                 * the consolelock spinlock.
+                 */
+                reject = 1;
+        } else {
+                pi = &port_info[port];
+                if ((pi->lp != HvLpIndexInvalid) &&
+                                (pi->lp != event->xSourceLp)) {
+                        /*
+                         * If this is tty is already connected to a different
+                         * partition, fail.
+                         */
+                        event->xRc = HvLpEvent_Rc_SubtypeError;
+                        cevent->subtype_result_code = viorc_openRejected;
+                        reject = 2;
+                } else {
+                        pi->lp = event->xSourceLp;
+                        event->xRc = HvLpEvent_Rc_Good;
+                        cevent->subtype_result_code = viorc_good;
+                        pi->seq = pi->ack = 0;
+                }
+        }
+
+        spin_unlock_irqrestore(&consolelock, flags);
+
+        if (reject == 1)
+                printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n");
+        else if (reject == 2)
+                printk(KERN_WARNING "hvc: open rejected: console in exclusive "
+                                "use by another partition.\n");
+
+        /* Return the acknowledgement */
+        HvCallEvent_ackLpEvent(event);
+}
+
+/*
+ * Handle a close charLpEvent.  This should ONLY be an Interrupt because the
+ * virtual console should never actually issue a close event to the hypervisor
+ * because the virtual console never goes away.  A close event coming from the
+ * hypervisor simply means that there are no client consoles connected to the
+ * virtual console.
+ */
+static void hvc_close_event(struct HvLpEvent *event)
+{
+        unsigned long flags;
+        struct viocharlpevent *cevent = (struct viocharlpevent *)event;
+        u8 port = cevent->virtual_device;
+
+        if (!hvlpevent_is_int(event)) {
+                printk(KERN_WARNING
+                        "hvc: got unexpected close acknowledgement\n");
+                return;
+        }
+
+        if (port >= VTTY_PORTS) {
+                printk(KERN_WARNING
+                        "hvc: close message from invalid virtual device.\n");
+                return;
+        }
+
+        /* For closes, just mark the console partition invalid */
+        spin_lock_irqsave(&consolelock, flags);
+
+        if (port_info[port].lp == event->xSourceLp)
+                port_info[port].lp = HvLpIndexInvalid;
+
+        spin_unlock_irqrestore(&consolelock, flags);
+}
+
+static void hvc_data_event(struct HvLpEvent *event)
+{
+        unsigned long flags;
+        struct viocharlpevent *cevent = (struct viocharlpevent *)event;
+        struct port_info *pi;
+        int n;
+        u8 port = cevent->virtual_device;
+
+        if (port >= VTTY_PORTS) {
+                printk(KERN_WARNING "hvc: data on invalid virtual device %d\n",
+                                port);
+                return;
+        }
+        if (cevent->len == 0)
+                return;
+
+        /*
+         * Change 05/01/2003 - Ryan Arnold: If a partition other than
+         * the current exclusive partition tries to send us data
+         * events then just drop them on the floor because we don't
+         * want his stinking data.  He isn't authorized to receive
+         * data because he wasn't the first one to get the console,
+         * therefore he shouldn't be allowed to send data either.
+         * This will work without an iSeries fix.
+         */
+        pi = &port_info[port];
+        if (pi->lp != event->xSourceLp)
+                return;
+
+        spin_lock_irqsave(&consolelock, flags);
+
+        n = IN_BUF_SIZE - pi->in_end;
+        if (n > cevent->len)
+                n = cevent->len;
+        if (n > 0) {
+                memcpy(&pi->in_buf[pi->in_end], cevent->data, n);
+                pi->in_end += n;
+        }
+        spin_unlock_irqrestore(&consolelock, flags);
+        if (n == 0)
+                printk(KERN_WARNING "hvc: input buffer overflow\n");
+}
+
+static void hvc_ack_event(struct HvLpEvent *event)
+{
+        struct viocharlpevent *cevent = (struct viocharlpevent *)event;
+        unsigned long flags;
+        u8 port = cevent->virtual_device;
+
+        if (port >= VTTY_PORTS) {
+                printk(KERN_WARNING "hvc: data on invalid virtual device\n");
+                return;
+        }
+
+        spin_lock_irqsave(&consolelock, flags);
+        port_info[port].ack = event->xCorrelationToken;
+        spin_unlock_irqrestore(&consolelock, flags);
+}
+
+static void hvc_config_event(struct HvLpEvent *event)
+{
+        struct viocharlpevent *cevent = (struct viocharlpevent *)event;
+
+        if (cevent->data[0] == 0x01)
+                printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n",
+                       cevent->data[1], cevent->data[2],
+                       cevent->data[3], cevent->data[4]);
+        else
+                printk(KERN_WARNING "hvc: unknown config event\n");
+}
+
+static void hvc_handle_event(struct HvLpEvent *event)
+{
+        int charminor;
+
+        if (event == NULL)
+                return;
+
+        charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK;
+        switch (charminor) {
+        case viocharopen:
+                hvc_open_event(event);
+                break;
+        case viocharclose:
+                hvc_close_event(event);
+                break;
+        case viochardata:
+                hvc_data_event(event);
+                break;
+        case viocharack:
+                hvc_ack_event(event);
+                break;
+        case viocharconfig:
+                hvc_config_event(event);
+                break;
+        default:
+                if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) {
+                        event->xRc = HvLpEvent_Rc_InvalidSubtype;
+                        HvCallEvent_ackLpEvent(event);
+                }
+        }
+}
+
+static int __init send_open(HvLpIndex remoteLp, void *sem)
+{
+        return HvCallEvent_signalLpEventFast(remoteLp,
+                        HvLpEvent_Type_VirtualIo,
+                        viomajorsubtype_chario | viocharopen,
+                        HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
+                        viopath_sourceinst(remoteLp),
+                        viopath_targetinst(remoteLp),
+                        (u64)(unsigned long)sem, VIOVERSION << 16,
+                        0, 0, 0, 0);
+}
+
+static int __init hvc_vio_init(void)
+{
+        atomic_t wait_flag;
+        int rc;
+
+        if (!firmware_has_feature(FW_FEATURE_ISERIES))
+                return -EIO;
+
+        /* +2 for fudge */
+        rc = viopath_open(HvLpConfig_getPrimaryLpIndex(),
+                        viomajorsubtype_chario, VIOCHAR_WINDOW + 2);
+        if (rc)
+                printk(KERN_WARNING "hvc: error opening to primary %d\n", rc);
+
+        if (viopath_hostLp == HvLpIndexInvalid)
+                vio_set_hostlp();
+
+        /*
+         * And if the primary is not the same as the hosting LP, open to the
+         * hosting lp
+         */
+        if ((viopath_hostLp != HvLpIndexInvalid) &&
+            (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) {
+                printk(KERN_INFO "hvc: open path to hosting (%d)\n",
+                                viopath_hostLp);
+                rc = viopath_open(viopath_hostLp, viomajorsubtype_chario,
+                                VIOCHAR_WINDOW + 2);    /* +2 for fudge */
+                if (rc)
+                        printk(KERN_WARNING
+                                "error opening to partition %d: %d\n",
+                                viopath_hostLp, rc);
+        }
+
+        if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0)
+                printk(KERN_WARNING
+                        "hvc: error seting handler for console events!\n");
+
+        /*
+         * First, try to open the console to the hosting lp.
+         * Wait on a semaphore for the response.
+         */
+        atomic_set(&wait_flag, 0);
+        if ((viopath_isactive(viopath_hostLp)) &&
+            (send_open(viopath_hostLp, &wait_flag) == 0)) {
+                printk(KERN_INFO "hvc: hosting partition %d\n", viopath_hostLp);
+                while (atomic_read(&wait_flag) == 0)
+                        mb();
+                atomic_set(&wait_flag, 0);
+        }
+
+        /*
+         * If we don't have an active console, try the primary
+         */
+        if ((!viopath_isactive(port_info[0].lp)) &&
+            (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) &&
+            (send_open(HvLpConfig_getPrimaryLpIndex(), &wait_flag) == 0)) {
+                printk(KERN_INFO "hvc: opening console to primary partition\n");
+                while (atomic_read(&wait_flag) == 0)
+                        mb();
+        }
+
+        /* Register as a vio device to receive callbacks */
+        rc = vio_register_driver(&hvc_vio_driver);
+
+        return rc;
+}
+module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
+
+static void __exit hvc_vio_exit(void)
+{
+        vio_unregister_driver(&hvc_vio_driver);
+}
+module_exit(hvc_vio_exit);
+
+/* the device tree order defines our numbering */
+static int __init hvc_find_vtys(void)
+{
+        struct device_node *vty;
+        int num_found = 0;
+
+        for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
+                        vty = of_find_node_by_name(vty, "vty")) {
+                const uint32_t *vtermno;
+
+                /* We have statically defined space for only a certain number
+                 * of console adapters.
+                 */
+                if ((num_found >= MAX_NR_HVC_CONSOLES) ||
+                                (num_found >= VTTY_PORTS)) {
+                        of_node_put(vty);
+                        break;
+                }
+
+                vtermno = of_get_property(vty, "reg", NULL);
+                if (!vtermno)
+                        continue;
+
+                if (!of_device_is_compatible(vty, "IBM,iSeries-vty"))
+                        continue;
+
+                if (num_found == 0)
+                        add_preferred_console("hvc", 0, NULL);
+                hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
+                ++num_found;
+        }
+
+        return num_found;
+}
+console_initcall(hvc_find_vtys);
diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
new file mode 100644
index 000000000000..b6f7d52f7c35
--- /dev/null
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -0,0 +1,1337 @@
+/*
+ * hvc_iucv.c - z/VM IUCV hypervisor console (HVC) device driver
+ *
+ * This HVC device driver provides terminal access using
+ * z/VM IUCV communication paths.
+ *
+ * Copyright IBM Corp. 2008, 2009
+ *
+ * Author(s):   Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
+ */
+#define KMSG_COMPONENT          "hvc_iucv"
+#define pr_fmt(fmt)             KMSG_COMPONENT ": " fmt
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <asm/ebcdic.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/mempool.h>
+#include <linux/moduleparam.h>
+#include <linux/tty.h>
+#include <linux/wait.h>
+#include <net/iucv/iucv.h>
+
+#include "hvc_console.h"
+
+
+/* General device driver settings */
+#define HVC_IUCV_MAGIC          0xc9e4c3e5
+#define MAX_HVC_IUCV_LINES      HVC_ALLOC_TTY_ADAPTERS
+#define MEMPOOL_MIN_NR          (PAGE_SIZE / sizeof(struct iucv_tty_buffer)/4)
+
+/* IUCV TTY message  */
+#define MSG_VERSION             0x02    /* Message version */
+#define MSG_TYPE_ERROR          0x01    /* Error message */
+#define MSG_TYPE_TERMENV        0x02    /* Terminal environment variable */
+#define MSG_TYPE_TERMIOS        0x04    /* Terminal IO struct update */
+#define MSG_TYPE_WINSIZE        0x08    /* Terminal window size update */
+#define MSG_TYPE_DATA           0x10    /* Terminal data */
+
+struct iucv_tty_msg {
+        u8      version;                /* Message version */
+        u8      type;                   /* Message type */
+#define MSG_MAX_DATALEN         ((u16)(~0))
+        u16     datalen;                /* Payload length */
+        u8      data[];                 /* Payload buffer */
+} __attribute__((packed));
+#define MSG_SIZE(s)             ((s) + offsetof(struct iucv_tty_msg, data))
+
+enum iucv_state_t {
+        IUCV_DISCONN    = 0,
+        IUCV_CONNECTED  = 1,
+        IUCV_SEVERED    = 2,
+};
+
+enum tty_state_t {
+        TTY_CLOSED      = 0,
+        TTY_OPENED      = 1,
+};
+
+struct hvc_iucv_private {
+        struct hvc_struct       *hvc;           /* HVC struct reference */
+        u8                      srv_name[8];    /* IUCV service name (ebcdic) */
+        unsigned char           is_console;     /* Linux console usage flag */
+        enum iucv_state_t       iucv_state;     /* IUCV connection status */
+        enum tty_state_t        tty_state;      /* TTY status */
+        struct iucv_path        *path;          /* IUCV path pointer */
+        spinlock_t              lock;           /* hvc_iucv_private lock */
+#define SNDBUF_SIZE             (PAGE_SIZE)     /* must be < MSG_MAX_DATALEN */
+        void                    *sndbuf;        /* send buffer            */
+        size_t                  sndbuf_len;     /* length of send buffer  */
+#define QUEUE_SNDBUF_DELAY      (HZ / 25)
+        struct delayed_work     sndbuf_work;    /* work: send iucv msg(s) */
+        wait_queue_head_t       sndbuf_waitq;   /* wait for send completion */
+        struct list_head        tty_outqueue;   /* outgoing IUCV messages */
+        struct list_head        tty_inqueue;    /* incoming IUCV messages */
+        struct device           *dev;           /* device structure */
+};
+
+struct iucv_tty_buffer {
+        struct list_head        list;   /* list pointer */
+        struct iucv_message     msg;    /* store an IUCV message */
+        size_t                  offset; /* data buffer offset */
+        struct iucv_tty_msg     *mbuf;  /* buffer to store input/output data */
+};
+
+/* IUCV callback handler */
+static  int hvc_iucv_path_pending(struct iucv_path *, u8[8], u8[16]);
+static void hvc_iucv_path_severed(struct iucv_path *, u8[16]);
+static void hvc_iucv_msg_pending(struct iucv_path *, struct iucv_message *);
+static void hvc_iucv_msg_complete(struct iucv_path *, struct iucv_message *);
+
+
+/* Kernel module parameter: use one terminal device as default */
+static unsigned long hvc_iucv_devices = 1;
+
+/* Array of allocated hvc iucv tty lines... */
+static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];
+#define IUCV_HVC_CON_IDX        (0)
+/* List of z/VM user ID filter entries (struct iucv_vmid_filter) */
+#define MAX_VMID_FILTER         (500)
+static size_t hvc_iucv_filter_size;
+static void *hvc_iucv_filter;
+static const char *hvc_iucv_filter_string;
+static DEFINE_RWLOCK(hvc_iucv_filter_lock);
+
+/* Kmem cache and mempool for iucv_tty_buffer elements */
+static struct kmem_cache *hvc_iucv_buffer_cache;
+static mempool_t *hvc_iucv_mempool;
+
+/* IUCV handler callback functions */
+static struct iucv_handler hvc_iucv_handler = {
+        .path_pending  = hvc_iucv_path_pending,
+        .path_severed  = hvc_iucv_path_severed,
+        .message_complete = hvc_iucv_msg_complete,
+        .message_pending  = hvc_iucv_msg_pending,
+};
+
+
+/**
+ * hvc_iucv_get_private() - Return a struct hvc_iucv_private instance.
+ * @num:        The HVC virtual terminal number (vtermno)
+ *
+ * This function returns the struct hvc_iucv_private instance that corresponds
+ * to the HVC virtual terminal number specified as parameter @num.
+ */
+struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num)
+{
+        if ((num < HVC_IUCV_MAGIC) || (num - HVC_IUCV_MAGIC > hvc_iucv_devices))
+                return NULL;
+        return hvc_iucv_table[num - HVC_IUCV_MAGIC];
+}
+
+/**
+ * alloc_tty_buffer() - Return a new struct iucv_tty_buffer element.
+ * @size:       Size of the internal buffer used to store data.
+ * @flags:      Memory allocation flags passed to mempool.
+ *
+ * This function allocates a new struct iucv_tty_buffer element and, optionally,
+ * allocates an internal data buffer with the specified size @size.
+ * The internal data buffer is always allocated with GFP_DMA which is
+ * required for receiving and sending data with IUCV.
+ * Note: The total message size arises from the internal buffer size and the
+ *       members of the iucv_tty_msg structure.
+ * The function returns NULL if memory allocation has failed.
+ */
+static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags)
+{
+        struct iucv_tty_buffer *bufp;
+
+        bufp = mempool_alloc(hvc_iucv_mempool, flags);
+        if (!bufp)
+                return NULL;
+        memset(bufp, 0, sizeof(*bufp));
+
+        if (size > 0) {
+                bufp->msg.length = MSG_SIZE(size);
+                bufp->mbuf = kmalloc(bufp->msg.length, flags | GFP_DMA);
+                if (!bufp->mbuf) {
+                        mempool_free(bufp, hvc_iucv_mempool);
+                        return NULL;
+                }
+                bufp->mbuf->version = MSG_VERSION;
+                bufp->mbuf->type    = MSG_TYPE_DATA;
+                bufp->mbuf->datalen = (u16) size;
+        }
+        return bufp;
+}
+
+/**
+ * destroy_tty_buffer() - destroy struct iucv_tty_buffer element.
+ * @bufp:       Pointer to a struct iucv_tty_buffer element, SHALL NOT be NULL.
+ */
+static void destroy_tty_buffer(struct iucv_tty_buffer *bufp)
+{
+        kfree(bufp->mbuf);
+        mempool_free(bufp, hvc_iucv_mempool);
+}
+
+/**
+ * destroy_tty_buffer_list() - call destroy_tty_buffer() for each list element.
+ * @list:       List containing struct iucv_tty_buffer elements.
+ */
+static void destroy_tty_buffer_list(struct list_head *list)
+{
+        struct iucv_tty_buffer *ent, *next;
+
+        list_for_each_entry_safe(ent, next, list, list) {
+                list_del(&ent->list);
+                destroy_tty_buffer(ent);
+        }
+}
+
+/**
+ * hvc_iucv_write() - Receive IUCV message & write data to HVC buffer.
+ * @priv:               Pointer to struct hvc_iucv_private
+ * @buf:                HVC buffer for writing received terminal data.
+ * @count:              HVC buffer size.
+ * @has_more_data:      Pointer to an int variable.
+ *
+ * The function picks up pending messages from the input queue and receives
+ * the message data that is then written to the specified buffer @buf.
+ * If the buffer size @count is less than the data message size, the
+ * message is kept on the input queue and @has_more_data is set to 1.
+ * If all message data has been written, the message is removed from
+ * the input queue.
+ *
+ * The function returns the number of bytes written to the terminal, zero if
+ * there are no pending data messages available or if there is no established
+ * IUCV path.
+ * If the IUCV path has been severed, then -EPIPE is returned to cause a
+ * hang up (that is issued by the HVC layer).
+ */
+static int hvc_iucv_write(struct hvc_iucv_private *priv,
+                          char *buf, int count, int *has_more_data)
+{
+        struct iucv_tty_buffer *rb;
+        int written;
+        int rc;
+
+        /* immediately return if there is no IUCV connection */
+        if (priv->iucv_state == IUCV_DISCONN)
+                return 0;
+
+        /* if the IUCV path has been severed, return -EPIPE to inform the
+         * HVC layer to hang up the tty device. */
+        if (priv->iucv_state == IUCV_SEVERED)
+                return -EPIPE;
+
+        /* check if there are pending messages */
+        if (list_empty(&priv->tty_inqueue))
+                return 0;
+
+        /* receive an iucv message and flip data to the tty (ldisc) */
+        rb = list_first_entry(&priv->tty_inqueue, struct iucv_tty_buffer, list);
+
+        written = 0;
+        if (!rb->mbuf) { /* message not yet received ... */
+                /* allocate mem to store msg data; if no memory is available
+                 * then leave the buffer on the list and re-try later */
+                rb->mbuf = kmalloc(rb->msg.length, GFP_ATOMIC | GFP_DMA);
+                if (!rb->mbuf)
+                        return -ENOMEM;
+
+                rc = __iucv_message_receive(priv->path, &rb->msg, 0,
+                                            rb->mbuf, rb->msg.length, NULL);
+                switch (rc) {
+                case 0: /* Successful       */
+                        break;
+                case 2: /* No message found */
+                case 9: /* Message purged   */
+                        break;
+                default:
+                        written = -EIO;
+                }
+                /* remove buffer if an error has occurred or received data
+                 * is not correct */
+                if (rc || (rb->mbuf->version != MSG_VERSION) ||
+                          (rb->msg.length    != MSG_SIZE(rb->mbuf->datalen)))
+                        goto out_remove_buffer;
+        }
+
+        switch (rb->mbuf->type) {
+        case MSG_TYPE_DATA:
+                written = min_t(int, rb->mbuf->datalen - rb->offset, count);
+                memcpy(buf, rb->mbuf->data + rb->offset, written);
+                if (written < (rb->mbuf->datalen - rb->offset)) {
+                        rb->offset += written;
+                        *has_more_data = 1;
+                        goto out_written;
+                }
+                break;
+
+        case MSG_TYPE_WINSIZE:
+                if (rb->mbuf->datalen != sizeof(struct winsize))
+                        break;
+                /* The caller must ensure that the hvc is locked, which
+                 * is the case when called from hvc_iucv_get_chars() */
+                __hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data));
+                break;
+
+        case MSG_TYPE_ERROR:    /* ignored ... */
+        case MSG_TYPE_TERMENV:  /* ignored ... */
+        case MSG_TYPE_TERMIOS:  /* ignored ... */
+                break;
+        }
+
+out_remove_buffer:
+        list_del(&rb->list);
+        destroy_tty_buffer(rb);
+        *has_more_data = !list_empty(&priv->tty_inqueue);
+
+out_written:
+        return written;
+}
+
+/**
+ * hvc_iucv_get_chars() - HVC get_chars operation.
+ * @vtermno:    HVC virtual terminal number.
+ * @buf:        Pointer to a buffer to store data
+ * @count:      Size of buffer available for writing
+ *
+ * The HVC thread calls this method to read characters from the back-end.
+ * If an IUCV communication path has been established, pending IUCV messages
+ * are received and data is copied into buffer @buf up to @count bytes.
+ *
+ * Locking:     The routine gets called under an irqsave() spinlock; and
+ *              the routine locks the struct hvc_iucv_private->lock to call
+ *              helper functions.
+ */
+static int hvc_iucv_get_chars(uint32_t vtermno, char *buf, int count)
+{
+        struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno);
+        int written;
+        int has_more_data;
+
+        if (count <= 0)
+                return 0;
+
+        if (!priv)
+                return -ENODEV;
+
+        spin_lock(&priv->lock);
+        has_more_data = 0;
+        written = hvc_iucv_write(priv, buf, count, &has_more_data);
+        spin_unlock(&priv->lock);
+
+        /* if there are still messages on the queue... schedule another run */
+        if (has_more_data)
+                hvc_kick();
+
+        return written;
+}
+
+/**
+ * hvc_iucv_queue() - Buffer terminal data for sending.
+ * @priv:       Pointer to struct hvc_iucv_private instance.
+ * @buf:        Buffer containing data to send.
+ * @count:      Size of buffer and amount of data to send.
+ *
+ * The function queues data for sending. To actually send the buffered data,
+ * a work queue function is scheduled (with QUEUE_SNDBUF_DELAY).
+ * The function returns the number of data bytes that has been buffered.
+ *
+ * If the device is not connected, data is ignored and the function returns
+ * @count.
+ * If the buffer is full, the function returns 0.
+ * If an existing IUCV communicaton path has been severed, -EPIPE is returned
+ * (that can be passed to HVC layer to cause a tty hangup).
+ */
+static int hvc_iucv_queue(struct hvc_iucv_private *priv, const char *buf,
+                          int count)
+{
+        size_t len;
+
+        if (priv->iucv_state == IUCV_DISCONN)
+                return count;                   /* ignore data */
+
+        if (priv->iucv_state == IUCV_SEVERED)
+                return -EPIPE;
+
+        len = min_t(size_t, count, SNDBUF_SIZE - priv->sndbuf_len);
+        if (!len)
+                return 0;
+
+        memcpy(priv->sndbuf + priv->sndbuf_len, buf, len);
+        priv->sndbuf_len += len;
+
+        if (priv->iucv_state == IUCV_CONNECTED)
+                schedule_delayed_work(&priv->sndbuf_work, QUEUE_SNDBUF_DELAY);
+
+        return len;
+}
+
+/**
+ * hvc_iucv_send() - Send an IUCV message containing terminal data.
+ * @priv:       Pointer to struct hvc_iucv_private instance.
+ *
+ * If an IUCV communication path has been established, the buffered output data
+ * is sent via an IUCV message and the number of bytes sent is returned.
+ * Returns 0 if there is no established IUCV communication path or
+ * -EPIPE if an existing IUCV communicaton path has been severed.
+ */
+static int hvc_iucv_send(struct hvc_iucv_private *priv)
+{
+        struct iucv_tty_buffer *sb;
+        int rc, len;
+
+        if (priv->iucv_state == IUCV_SEVERED)
+                return -EPIPE;
+
+        if (priv->iucv_state == IUCV_DISCONN)
+                return -EIO;
+
+        if (!priv->sndbuf_len)
+                return 0;
+
+        /* allocate internal buffer to store msg data and also compute total
+         * message length */
+        sb = alloc_tty_buffer(priv->sndbuf_len, GFP_ATOMIC);
+        if (!sb)
+                return -ENOMEM;
+
+        memcpy(sb->mbuf->data, priv->sndbuf, priv->sndbuf_len);
+        sb->mbuf->datalen = (u16) priv->sndbuf_len;
+        sb->msg.length = MSG_SIZE(sb->mbuf->datalen);
+
+        list_add_tail(&sb->list, &priv->tty_outqueue);
+
+        rc = __iucv_message_send(priv->path, &sb->msg, 0, 0,
+                                 (void *) sb->mbuf, sb->msg.length);
+        if (rc) {
+                /* drop the message here; however we might want to handle
+                 * 0x03 (msg limit reached) by trying again... */
+                list_del(&sb->list);
+                destroy_tty_buffer(sb);
+        }
+        len = priv->sndbuf_len;
+        priv->sndbuf_len = 0;
+
+        return len;
+}
+
+/**
+ * hvc_iucv_sndbuf_work() - Send buffered data over IUCV
+ * @work:       Work structure.
+ *
+ * This work queue function sends buffered output data over IUCV and,
+ * if not all buffered data could be sent, reschedules itself.
+ */
+static void hvc_iucv_sndbuf_work(struct work_struct *work)
+{
+        struct hvc_iucv_private *priv;
+
+        priv = container_of(work, struct hvc_iucv_private, sndbuf_work.work);
+        if (!priv)
+                return;
+
+        spin_lock_bh(&priv->lock);
+        hvc_iucv_send(priv);
+        spin_unlock_bh(&priv->lock);
+}
+
+/**
+ * hvc_iucv_put_chars() - HVC put_chars operation.
+ * @vtermno:    HVC virtual terminal number.
+ * @buf:        Pointer to an buffer to read data from
+ * @count:      Size of buffer available for reading
+ *
+ * The HVC thread calls this method to write characters to the back-end.
+ * The function calls hvc_iucv_queue() to queue terminal data for sending.
+ *
+ * Locking:     The method gets called under an irqsave() spinlock; and
+ *              locks struct hvc_iucv_private->lock.
+ */
+static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count)
+{
+        struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno);
+        int queued;
+
+        if (count <= 0)
+                return 0;
+
+        if (!priv)
+                return -ENODEV;
+
+        spin_lock(&priv->lock);
+        queued = hvc_iucv_queue(priv, buf, count);
+        spin_unlock(&priv->lock);
+
+        return queued;
+}
+
+/**
+ * hvc_iucv_notifier_add() - HVC notifier for opening a TTY for the first time.
+ * @hp: Pointer to the HVC device (struct hvc_struct)
+ * @id: Additional data (originally passed to hvc_alloc): the index of an struct
+ *      hvc_iucv_private instance.
+ *
+ * The function sets the tty state to TTY_OPENED for the struct hvc_iucv_private
+ * instance that is derived from @id. Always returns 0.
+ *
+ * Locking:     struct hvc_iucv_private->lock, spin_lock_bh
+ */
+static int hvc_iucv_notifier_add(struct hvc_struct *hp, int id)
+{
+        struct hvc_iucv_private *priv;
+
+        priv = hvc_iucv_get_private(id);
+        if (!priv)
+                return 0;
+
+        spin_lock_bh(&priv->lock);
+        priv->tty_state = TTY_OPENED;
+        spin_unlock_bh(&priv->lock);
+
+        return 0;
+}
+
+/**
+ * hvc_iucv_cleanup() - Clean up and reset a z/VM IUCV HVC instance.
+ * @priv:       Pointer to the struct hvc_iucv_private instance.
+ */
+static void hvc_iucv_cleanup(struct hvc_iucv_private *priv)
+{
+        destroy_tty_buffer_list(&priv->tty_outqueue);
+        destroy_tty_buffer_list(&priv->tty_inqueue);
+
+        priv->tty_state = TTY_CLOSED;
+        priv->iucv_state = IUCV_DISCONN;
+
+        priv->sndbuf_len = 0;
+}
+
+/**
+ * tty_outqueue_empty() - Test if the tty outq is empty
+ * @priv:       Pointer to struct hvc_iucv_private instance.
+ */
+static inline int tty_outqueue_empty(struct hvc_iucv_private *priv)
+{
+        int rc;
+
+        spin_lock_bh(&priv->lock);
+        rc = list_empty(&priv->tty_outqueue);
+        spin_unlock_bh(&priv->lock);
+
+        return rc;
+}
+
+/**
+ * flush_sndbuf_sync() - Flush send buffer and wait for completion
+ * @priv:       Pointer to struct hvc_iucv_private instance.
+ *
+ * The routine cancels a pending sndbuf work, calls hvc_iucv_send()
+ * to flush any buffered terminal output data and waits for completion.
+ */
+static void flush_sndbuf_sync(struct hvc_iucv_private *priv)
+{
+        int sync_wait;
+
+        cancel_delayed_work_sync(&priv->sndbuf_work);
+
+        spin_lock_bh(&priv->lock);
+        hvc_iucv_send(priv);            /* force sending buffered data */
+        sync_wait = !list_empty(&priv->tty_outqueue); /* anything queued ? */
+        spin_unlock_bh(&priv->lock);
+
+        if (sync_wait)
+                wait_event_timeout(priv->sndbuf_waitq,
+                                   tty_outqueue_empty(priv), HZ/10);
+}
+
+/**
+ * hvc_iucv_hangup() - Sever IUCV path and schedule hvc tty hang up
+ * @priv:       Pointer to hvc_iucv_private structure
+ *
+ * This routine severs an existing IUCV communication path and hangs
+ * up the underlying HVC terminal device.
+ * The hang-up occurs only if an IUCV communication path is established;
+ * otherwise there is no need to hang up the terminal device.
+ *
+ * The IUCV HVC hang-up is separated into two steps:
+ * 1. After the IUCV path has been severed, the iucv_state is set to
+ *    IUCV_SEVERED.
+ * 2. Later, when the HVC thread calls hvc_iucv_get_chars(), the
+ *    IUCV_SEVERED state causes the tty hang-up in the HVC layer.
+ *
+ * If the tty has not yet been opened, clean up the hvc_iucv_private
+ * structure to allow re-connects.
+ * If the tty has been opened, let get_chars() return -EPIPE to signal
+ * the HVC layer to hang up the tty and, if so, wake up the HVC thread
+ * to call get_chars()...
+ *
+ * Special notes on hanging up a HVC terminal instantiated as console:
+ * Hang-up:     1. do_tty_hangup() replaces file ops (= hung_up_tty_fops)
+ *              2. do_tty_hangup() calls tty->ops->close() for console_filp
+ *                      => no hangup notifier is called by HVC (default)
+ *              2. hvc_close() returns because of tty_hung_up_p(filp)
+ *                      => no delete notifier is called!
+ * Finally, the back-end is not being notified, thus, the tty session is
+ * kept active (TTY_OPEN) to be ready for re-connects.
+ *
+ * Locking:     spin_lock(&priv->lock) w/o disabling bh
+ */
+static void hvc_iucv_hangup(struct hvc_iucv_private *priv)
+{
+        struct iucv_path *path;
+
+        path = NULL;
+        spin_lock(&priv->lock);
+        if (priv->iucv_state == IUCV_CONNECTED) {
+                path = priv->path;
+                priv->path = NULL;
+                priv->iucv_state = IUCV_SEVERED;
+                if (priv->tty_state == TTY_CLOSED)
+                        hvc_iucv_cleanup(priv);
+                else
+                        /* console is special (see above) */
+                        if (priv->is_console) {
+                                hvc_iucv_cleanup(priv);
+                                priv->tty_state = TTY_OPENED;
+                        } else
+                                hvc_kick();
+        }
+        spin_unlock(&priv->lock);
+
+        /* finally sever path (outside of priv->lock due to lock ordering) */
+        if (path) {
+                iucv_path_sever(path, NULL);
+                iucv_path_free(path);
+        }
+}
+
+/**
+ * hvc_iucv_notifier_hangup() - HVC notifier for TTY hangups.
+ * @hp:         Pointer to the HVC device (struct hvc_struct)
+ * @id:         Additional data (originally passed to hvc_alloc):
+ *              the index of an struct hvc_iucv_private instance.
+ *
+ * This routine notifies the HVC back-end that a tty hangup (carrier loss,
+ * virtual or otherwise) has occurred.
+ * The z/VM IUCV HVC device driver ignores virtual hangups (vhangup())
+ * to keep an existing IUCV communication path established.
+ * (Background: vhangup() is called from user space (by getty or login) to
+ *              disable writing to the tty by other applications).
+ * If the tty has been opened and an established IUCV path has been severed
+ * (we caused the tty hangup), the function calls hvc_iucv_cleanup().
+ *
+ * Locking:     struct hvc_iucv_private->lock
+ */
+static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id)
+{
+        struct hvc_iucv_private *priv;
+
+        priv = hvc_iucv_get_private(id);
+        if (!priv)
+                return;
+
+        flush_sndbuf_sync(priv);
+
+        spin_lock_bh(&priv->lock);
+        /* NOTE: If the hangup was scheduled by ourself (from the iucv
+         *       path_servered callback [IUCV_SEVERED]), we have to clean up
+         *       our structure and to set state to TTY_CLOSED.
+         *       If the tty was hung up otherwise (e.g. vhangup()), then we
+         *       ignore this hangup and keep an established IUCV path open...
+         *       (...the reason is that we are not able to connect back to the
+         *       client if we disconnect on hang up) */
+        priv->tty_state = TTY_CLOSED;
+
+        if (priv->iucv_state == IUCV_SEVERED)
+                hvc_iucv_cleanup(priv);
+        spin_unlock_bh(&priv->lock);
+}
+
+/**
+ * hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time.
+ * @hp:         Pointer to the HVC device (struct hvc_struct)
+ * @id:         Additional data (originally passed to hvc_alloc):
+ *              the index of an struct hvc_iucv_private instance.
+ *
+ * This routine notifies the HVC back-end that the last tty device fd has been
+ * closed.  The function calls hvc_iucv_cleanup() to clean up the struct
+ * hvc_iucv_private instance.
+ *
+ * Locking:     struct hvc_iucv_private->lock
+ */
+static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
+{
+        struct hvc_iucv_private *priv;
+        struct iucv_path        *path;
+
+        priv = hvc_iucv_get_private(id);
+        if (!priv)
+                return;
+
+        flush_sndbuf_sync(priv);
+
+        spin_lock_bh(&priv->lock);
+        path = priv->path;              /* save reference to IUCV path */
+        priv->path = NULL;
+        hvc_iucv_cleanup(priv);
+        spin_unlock_bh(&priv->lock);
+
+        /* sever IUCV path outside of priv->lock due to lock ordering of:
+         * priv->lock <--> iucv_table_lock */
+        if (path) {
+                iucv_path_sever(path, NULL);
+                iucv_path_free(path);
+        }
+}
+
+/**
+ * hvc_iucv_filter_connreq() - Filter connection request based on z/VM user ID
+ * @ipvmid:     Originating z/VM user ID (right padded with blanks)
+ *
+ * Returns 0 if the z/VM user ID @ipvmid is allowed to connection, otherwise
+ * non-zero.
+ */
+static int hvc_iucv_filter_connreq(u8 ipvmid[8])
+{
+        size_t i;
+
+        /* Note: default policy is ACCEPT if no filter is set */
+        if (!hvc_iucv_filter_size)
+                return 0;
+
+        for (i = 0; i < hvc_iucv_filter_size; i++)
+                if (0 == memcmp(ipvmid, hvc_iucv_filter + (8 * i), 8))
+                        return 0;
+        return 1;
+}
+
+/**
+ * hvc_iucv_path_pending() - IUCV handler to process a connection request.
+ * @path:       Pending path (struct iucv_path)
+ * @ipvmid:     z/VM system identifier of originator
+ * @ipuser:     User specified data for this path
+ *              (AF_IUCV: port/service name and originator port)
+ *
+ * The function uses the @ipuser data to determine if the pending path belongs
+ * to a terminal managed by this device driver.
+ * If the path belongs to this driver, ensure that the terminal is not accessed
+ * multiple times (only one connection to a terminal is allowed).
+ * If the terminal is not yet connected, the pending path is accepted and is
+ * associated to the appropriate struct hvc_iucv_private instance.
+ *
+ * Returns 0 if @path belongs to a terminal managed by the this device driver;
+ * otherwise returns -ENODEV in order to dispatch this path to other handlers.
+ *
+ * Locking:     struct hvc_iucv_private->lock
+ */
+static  int hvc_iucv_path_pending(struct iucv_path *path,
+                                  u8 ipvmid[8], u8 ipuser[16])
+{
+        struct hvc_iucv_private *priv;
+        u8 nuser_data[16];
+        u8 vm_user_id[9];
+        int i, rc;
+
+        priv = NULL;
+        for (i = 0; i < hvc_iucv_devices; i++)
+                if (hvc_iucv_table[i] &&
+                    (0 == memcmp(hvc_iucv_table[i]->srv_name, ipuser, 8))) {
+                        priv = hvc_iucv_table[i];
+                        break;
+                }
+        if (!priv)
+                return -ENODEV;
+
+        /* Enforce that ipvmid is allowed to connect to us */
+        read_lock(&hvc_iucv_filter_lock);
+        rc = hvc_iucv_filter_connreq(ipvmid);
+        read_unlock(&hvc_iucv_filter_lock);
+        if (rc) {
+                iucv_path_sever(path, ipuser);
+                iucv_path_free(path);
+                memcpy(vm_user_id, ipvmid, 8);
+                vm_user_id[8] = 0;
+                pr_info("A connection request from z/VM user ID %s "
+                        "was refused\n", vm_user_id);
+                return 0;
+        }
+
+        spin_lock(&priv->lock);
+
+        /* If the terminal is already connected or being severed, then sever
+         * this path to enforce that there is only ONE established communication
+         * path per terminal. */
+        if (priv->iucv_state != IUCV_DISCONN) {
+                iucv_path_sever(path, ipuser);
+                iucv_path_free(path);
+                goto out_path_handled;
+        }
+
+        /* accept path */
+        memcpy(nuser_data, ipuser + 8, 8);  /* remote service (for af_iucv) */
+        memcpy(nuser_data + 8, ipuser, 8);  /* local service  (for af_iucv) */
+        path->msglim = 0xffff;              /* IUCV MSGLIMIT */
+        path->flags &= ~IUCV_IPRMDATA;      /* TODO: use IUCV_IPRMDATA */
+        rc = iucv_path_accept(path, &hvc_iucv_handler, nuser_data, priv);
+        if (rc) {
+                iucv_path_sever(path, ipuser);
+                iucv_path_free(path);
+                goto out_path_handled;
+        }
+        priv->path = path;
+        priv->iucv_state = IUCV_CONNECTED;
+
+        /* flush buffered output data... */
+        schedule_delayed_work(&priv->sndbuf_work, 5);
+
+out_path_handled:
+        spin_unlock(&priv->lock);
+        return 0;
+}
+
+/**
+ * hvc_iucv_path_severed() - IUCV handler to process a path sever.
+ * @path:       Pending path (struct iucv_path)
+ * @ipuser:     User specified data for this path
+ *              (AF_IUCV: port/service name and originator port)
+ *
+ * This function calls the hvc_iucv_hangup() function for the
+ * respective IUCV HVC terminal.
+ *
+ * Locking:     struct hvc_iucv_private->lock
+ */
+static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16])
+{
+        struct hvc_iucv_private *priv = path->private;
+
+        hvc_iucv_hangup(priv);
+}
+
+/**
+ * hvc_iucv_msg_pending() - IUCV handler to process an incoming IUCV message.
+ * @path:       Pending path (struct iucv_path)
+ * @msg:        Pointer to the IUCV message
+ *
+ * The function puts an incoming message on the input queue for later
+ * processing (by hvc_iucv_get_chars() / hvc_iucv_write()).
+ * If the tty has not yet been opened, the message is rejected.
+ *
+ * Locking:     struct hvc_iucv_private->lock
+ */
+static void hvc_iucv_msg_pending(struct iucv_path *path,
+                                 struct iucv_message *msg)
+{
+        struct hvc_iucv_private *priv = path->private;
+        struct iucv_tty_buffer *rb;
+
+        /* reject messages that exceed max size of iucv_tty_msg->datalen */
+        if (msg->length > MSG_SIZE(MSG_MAX_DATALEN)) {
+                iucv_message_reject(path, msg);
+                return;
+        }
+
+        spin_lock(&priv->lock);
+
+        /* reject messages if tty has not yet been opened */
+        if (priv->tty_state == TTY_CLOSED) {
+                iucv_message_reject(path, msg);
+                goto unlock_return;
+        }
+
+        /* allocate tty buffer to save iucv msg only */
+        rb = alloc_tty_buffer(0, GFP_ATOMIC);
+        if (!rb) {
+                iucv_message_reject(path, msg);
+                goto unlock_return;     /* -ENOMEM */
+        }
+        rb->msg = *msg;
+
+        list_add_tail(&rb->list, &priv->tty_inqueue);
+
+        hvc_kick();     /* wake up hvc thread */
+
+unlock_return:
+        spin_unlock(&priv->lock);
+}
+
+/**
+ * hvc_iucv_msg_complete() - IUCV handler to process message completion
+ * @path:       Pending path (struct iucv_path)
+ * @msg:        Pointer to the IUCV message
+ *
+ * The function is called upon completion of message delivery to remove the
+ * message from the outqueue. Additional delivery information can be found
+ * msg->audit: rejected messages (0x040000 (IPADRJCT)), and
+ *             purged messages   (0x010000 (IPADPGNR)).
+ *
+ * Locking:     struct hvc_iucv_private->lock
+ */
+static void hvc_iucv_msg_complete(struct iucv_path *path,
+                                  struct iucv_message *msg)
+{
+        struct hvc_iucv_private *priv = path->private;
+        struct iucv_tty_buffer  *ent, *next;
+        LIST_HEAD(list_remove);
+
+        spin_lock(&priv->lock);
+        list_for_each_entry_safe(ent, next, &priv->tty_outqueue, list)
+                if (ent->msg.id == msg->id) {
+                        list_move(&ent->list, &list_remove);
+                        break;
+                }
+        wake_up(&priv->sndbuf_waitq);
+        spin_unlock(&priv->lock);
+        destroy_tty_buffer_list(&list_remove);
+}
+
+/**
+ * hvc_iucv_pm_freeze() - Freeze PM callback
+ * @dev:        IUVC HVC terminal device
+ *
+ * Sever an established IUCV communication path and
+ * trigger a hang-up of the underlying HVC terminal.
+ */
+static int hvc_iucv_pm_freeze(struct device *dev)
+{
+        struct hvc_iucv_private *priv = dev_get_drvdata(dev);
+
+        local_bh_disable();
+        hvc_iucv_hangup(priv);
+        local_bh_enable();
+
+        return 0;
+}
+
+/**
+ * hvc_iucv_pm_restore_thaw() - Thaw and restore PM callback
+ * @dev:        IUVC HVC terminal device
+ *
+ * Wake up the HVC thread to trigger hang-up and respective
+ * HVC back-end notifier invocations.
+ */
+static int hvc_iucv_pm_restore_thaw(struct device *dev)
+{
+        hvc_kick();
+        return 0;
+}
+
+
+/* HVC operations */
+static const struct hv_ops hvc_iucv_ops = {
+        .get_chars = hvc_iucv_get_chars,
+        .put_chars = hvc_iucv_put_chars,
+        .notifier_add = hvc_iucv_notifier_add,
+        .notifier_del = hvc_iucv_notifier_del,
+        .notifier_hangup = hvc_iucv_notifier_hangup,
+};
+
+/* Suspend / resume device operations */
+static const struct dev_pm_ops hvc_iucv_pm_ops = {
+        .freeze   = hvc_iucv_pm_freeze,
+        .thaw     = hvc_iucv_pm_restore_thaw,
+        .restore  = hvc_iucv_pm_restore_thaw,
+};
+
+/* IUCV HVC device driver */
+static struct device_driver hvc_iucv_driver = {
+        .name = KMSG_COMPONENT,
+        .bus  = &iucv_bus,
+        .pm   = &hvc_iucv_pm_ops,
+};
+
+/**
+ * hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance
+ * @id:                 hvc_iucv_table index
+ * @is_console:         Flag if the instance is used as Linux console
+ *
+ * This function allocates a new hvc_iucv_private structure and stores
+ * the instance in hvc_iucv_table at index @id.
+ * Returns 0 on success; otherwise non-zero.
+ */
+static int __init hvc_iucv_alloc(int id, unsigned int is_console)
+{
+        struct hvc_iucv_private *priv;
+        char name[9];
+        int rc;
+
+        priv = kzalloc(sizeof(struct hvc_iucv_private), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        spin_lock_init(&priv->lock);
+        INIT_LIST_HEAD(&priv->tty_outqueue);
+        INIT_LIST_HEAD(&priv->tty_inqueue);
+        INIT_DELAYED_WORK(&priv->sndbuf_work, hvc_iucv_sndbuf_work);
+        init_waitqueue_head(&priv->sndbuf_waitq);
+
+        priv->sndbuf = (void *) get_zeroed_page(GFP_KERNEL);
+        if (!priv->sndbuf) {
+                kfree(priv);
+                return -ENOMEM;
+        }
+
+        /* set console flag */
+        priv->is_console = is_console;
+
+        /* allocate hvc device */
+        priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, /*             PAGE_SIZE */
+                              HVC_IUCV_MAGIC + id, &hvc_iucv_ops, 256);
+        if (IS_ERR(priv->hvc)) {
+                rc = PTR_ERR(priv->hvc);
+                goto out_error_hvc;
+        }
+
+        /* notify HVC thread instead of using polling */
+        priv->hvc->irq_requested = 1;
+
+        /* setup iucv related information */
+        snprintf(name, 9, "lnxhvc%-2d", id);
+        memcpy(priv->srv_name, name, 8);
+        ASCEBC(priv->srv_name, 8);
+
+        /* create and setup device */
+        priv->dev = kzalloc(sizeof(*priv->dev), GFP_KERNEL);
+        if (!priv->dev) {
+                rc = -ENOMEM;
+                goto out_error_dev;
+        }
+        dev_set_name(priv->dev, "hvc_iucv%d", id);
+        dev_set_drvdata(priv->dev, priv);
+        priv->dev->bus = &iucv_bus;
+        priv->dev->parent = iucv_root;
+        priv->dev->driver = &hvc_iucv_driver;
+        priv->dev->release = (void (*)(struct device *)) kfree;
+        rc = device_register(priv->dev);
+        if (rc) {
+                put_device(priv->dev);
+                goto out_error_dev;
+        }
+
+        hvc_iucv_table[id] = priv;
+        return 0;
+
+out_error_dev:
+        hvc_remove(priv->hvc);
+out_error_hvc:
+        free_page((unsigned long) priv->sndbuf);
+        kfree(priv);
+
+        return rc;
+}
+
+/**
+ * hvc_iucv_destroy() - Destroy and free hvc_iucv_private instances
+ */
+static void __init hvc_iucv_destroy(struct hvc_iucv_private *priv)
+{
+        hvc_remove(priv->hvc);
+        device_unregister(priv->dev);
+        free_page((unsigned long) priv->sndbuf);
+        kfree(priv);
+}
+
+/**
+ * hvc_iucv_parse_filter() - Parse filter for a single z/VM user ID
+ * @filter:     String containing a comma-separated list of z/VM user IDs
+ */
+static const char *hvc_iucv_parse_filter(const char *filter, char *dest)
+{
+        const char *nextdelim, *residual;
+        size_t len;
+
+        nextdelim = strchr(filter, ',');
+        if (nextdelim) {
+                len = nextdelim - filter;
+                residual = nextdelim + 1;
+        } else {
+                len = strlen(filter);
+                residual = filter + len;
+        }
+
+        if (len == 0)
+                return ERR_PTR(-EINVAL);
+
+        /* check for '\n' (if called from sysfs) */
+        if (filter[len - 1] == '\n')
+                len--;
+
+        if (len > 8)
+                return ERR_PTR(-EINVAL);
+
+        /* pad with blanks and save upper case version of user ID */
+        memset(dest, ' ', 8);
+        while (len--)
+                dest[len] = toupper(filter[len]);
+        return residual;
+}
+
+/**
+ * hvc_iucv_setup_filter() - Set up z/VM user ID filter
+ * @filter:     String consisting of a comma-separated list of z/VM user IDs
+ *
+ * The function parses the @filter string and creates an array containing
+ * the list of z/VM user ID filter entries.
+ * Return code 0 means success, -EINVAL if the filter is syntactically
+ * incorrect, -ENOMEM if there was not enough memory to allocate the
+ * filter list array, or -ENOSPC if too many z/VM user IDs have been specified.
+ */
+static int hvc_iucv_setup_filter(const char *val)
+{
+        const char *residual;
+        int err;
+        size_t size, count;
+        void *array, *old_filter;
+
+        count = strlen(val);
+        if (count == 0 || (count == 1 && val[0] == '\n')) {
+                size  = 0;
+                array = NULL;
+                goto out_replace_filter;        /* clear filter */
+        }
+
+        /* count user IDs in order to allocate sufficient memory */
+        size = 1;
+        residual = val;
+        while ((residual = strchr(residual, ',')) != NULL) {
+                residual++;
+                size++;
+        }
+
+        /* check if the specified list exceeds the filter limit */
+        if (size > MAX_VMID_FILTER)
+                return -ENOSPC;
+
+        array = kzalloc(size * 8, GFP_KERNEL);
+        if (!array)
+                return -ENOMEM;
+
+        count = size;
+        residual = val;
+        while (*residual && count) {
+                residual = hvc_iucv_parse_filter(residual,
+                                                 array + ((size - count) * 8));
+                if (IS_ERR(residual)) {
+                        err = PTR_ERR(residual);
+                        kfree(array);
+                        goto out_err;
+                }
+                count--;
+        }
+
+out_replace_filter:
+        write_lock_bh(&hvc_iucv_filter_lock);
+        old_filter = hvc_iucv_filter;
+        hvc_iucv_filter_size = size;
+        hvc_iucv_filter = array;
+        write_unlock_bh(&hvc_iucv_filter_lock);
+        kfree(old_filter);
+
+        err = 0;
+out_err:
+        return err;
+}
+
+/**
+ * param_set_vmidfilter() - Set z/VM user ID filter parameter
+ * @val:        String consisting of a comma-separated list of z/VM user IDs
+ * @kp:         Kernel parameter pointing to hvc_iucv_filter array
+ *
+ * The function sets up the z/VM user ID filter specified as comma-separated
+ * list of user IDs in @val.
+ * Note: If it is called early in the boot process, @val is stored and
+ *       parsed later in hvc_iucv_init().
+ */
+static int param_set_vmidfilter(const char *val, const struct kernel_param *kp)
+{
+        int rc;
+
+        if (!MACHINE_IS_VM || !hvc_iucv_devices)
+                return -ENODEV;
+
+        if (!val)
+                return -EINVAL;
+
+        rc = 0;
+        if (slab_is_available())
+                rc = hvc_iucv_setup_filter(val);
+        else
+                hvc_iucv_filter_string = val;   /* defer... */
+        return rc;
+}
+
+/**
+ * param_get_vmidfilter() - Get z/VM user ID filter
+ * @buffer:     Buffer to store z/VM user ID filter,
+ *              (buffer size assumption PAGE_SIZE)
+ * @kp:         Kernel parameter pointing to the hvc_iucv_filter array
+ *
+ * The function stores the filter as a comma-separated list of z/VM user IDs
+ * in @buffer. Typically, sysfs routines call this function for attr show.
+ */
+static int param_get_vmidfilter(char *buffer, const struct kernel_param *kp)
+{
+        int rc;
+        size_t index, len;
+        void *start, *end;
+
+        if (!MACHINE_IS_VM || !hvc_iucv_devices)
+                return -ENODEV;
+
+        rc = 0;
+        read_lock_bh(&hvc_iucv_filter_lock);
+        for (index = 0; index < hvc_iucv_filter_size; index++) {
+                start = hvc_iucv_filter + (8 * index);
+                end   = memchr(start, ' ', 8);
+                len   = (end) ? end - start : 8;
+                memcpy(buffer + rc, start, len);
+                rc += len;
+                buffer[rc++] = ',';
+        }
+        read_unlock_bh(&hvc_iucv_filter_lock);
+        if (rc)
+                buffer[--rc] = '\0';    /* replace last comma and update rc */
+        return rc;
+}
+
+#define param_check_vmidfilter(name, p) __param_check(name, p, void)
+
+static struct kernel_param_ops param_ops_vmidfilter = {
+        .set = param_set_vmidfilter,
+        .get = param_get_vmidfilter,
+};
+
+/**
+ * hvc_iucv_init() - z/VM IUCV HVC device driver initialization
+ */
+static int __init hvc_iucv_init(void)
+{
+        int rc;
+        unsigned int i;
+
+        if (!hvc_iucv_devices)
+                return -ENODEV;
+
+        if (!MACHINE_IS_VM) {
+                pr_notice("The z/VM IUCV HVC device driver cannot "
+                           "be used without z/VM\n");
+                rc = -ENODEV;
+                goto out_error;
+        }
+
+        if (hvc_iucv_devices > MAX_HVC_IUCV_LINES) {
+                pr_err("%lu is not a valid value for the hvc_iucv= "
+                        "kernel parameter\n", hvc_iucv_devices);
+                rc = -EINVAL;
+                goto out_error;
+        }
+
+        /* register IUCV HVC device driver */
+        rc = driver_register(&hvc_iucv_driver);
+        if (rc)
+                goto out_error;
+
+        /* parse hvc_iucv_allow string and create z/VM user ID filter list */
+        if (hvc_iucv_filter_string) {
+                rc = hvc_iucv_setup_filter(hvc_iucv_filter_string);
+                switch (rc) {
+                case 0:
+                        break;
+                case -ENOMEM:
+                        pr_err("Allocating memory failed with "
+                                "reason code=%d\n", 3);
+                        goto out_error;
+                case -EINVAL:
+                        pr_err("hvc_iucv_allow= does not specify a valid "
+                                "z/VM user ID list\n");
+                        goto out_error;
+                case -ENOSPC:
+                        pr_err("hvc_iucv_allow= specifies too many "
+                                "z/VM user IDs\n");
+                        goto out_error;
+                default:
+                        goto out_error;
+                }
+        }
+
+        hvc_iucv_buffer_cache = kmem_cache_create(KMSG_COMPONENT,
+                                           sizeof(struct iucv_tty_buffer),
+                                           0, 0, NULL);
+        if (!hvc_iucv_buffer_cache) {
+                pr_err("Allocating memory failed with reason code=%d\n", 1);
+                rc = -ENOMEM;
+                goto out_error;
+        }
+
+        hvc_iucv_mempool = mempool_create_slab_pool(MEMPOOL_MIN_NR,
+                                                    hvc_iucv_buffer_cache);
+        if (!hvc_iucv_mempool) {
+                pr_err("Allocating memory failed with reason code=%d\n", 2);
+                kmem_cache_destroy(hvc_iucv_buffer_cache);
+                rc = -ENOMEM;
+                goto out_error;
+        }
+
+        /* register the first terminal device as console
+         * (must be done before allocating hvc terminal devices) */
+        rc = hvc_instantiate(HVC_IUCV_MAGIC, IUCV_HVC_CON_IDX, &hvc_iucv_ops);
+        if (rc) {
+                pr_err("Registering HVC terminal device as "
+                       "Linux console failed\n");
+                goto out_error_memory;
+        }
+
+        /* allocate hvc_iucv_private structs */
+        for (i = 0; i < hvc_iucv_devices; i++) {
+                rc = hvc_iucv_alloc(i, (i == IUCV_HVC_CON_IDX) ? 1 : 0);
+                if (rc) {
+                        pr_err("Creating a new HVC terminal device "
+                                "failed with error code=%d\n", rc);
+                        goto out_error_hvc;
+                }
+        }
+
+        /* register IUCV callback handler */
+        rc = iucv_register(&hvc_iucv_handler, 0);
+        if (rc) {
+                pr_err("Registering IUCV handlers failed with error code=%d\n",
+                        rc);
+                goto out_error_hvc;
+        }
+
+        return 0;
+
+out_error_hvc:
+        for (i = 0; i < hvc_iucv_devices; i++)
+                if (hvc_iucv_table[i])
+                        hvc_iucv_destroy(hvc_iucv_table[i]);
+out_error_memory:
+        mempool_destroy(hvc_iucv_mempool);
+        kmem_cache_destroy(hvc_iucv_buffer_cache);
+out_error:
+        if (hvc_iucv_filter)
+                kfree(hvc_iucv_filter);
+        hvc_iucv_devices = 0; /* ensure that we do not provide any device */
+        return rc;
+}
+
+/**
+ * hvc_iucv_config() - Parsing of hvc_iucv=  kernel command line parameter
+ * @val:        Parameter value (numeric)
+ */
+static  int __init hvc_iucv_config(char *val)
+{
+         return strict_strtoul(val, 10, &hvc_iucv_devices);
+}
+
+
+device_initcall(hvc_iucv_init);
+__setup("hvc_iucv=", hvc_iucv_config);
+core_param(hvc_iucv_allow, hvc_iucv_filter, vmidfilter, 0640);
diff --git a/drivers/tty/hvc/hvc_rtas.c b/drivers/tty/hvc/hvc_rtas.c
new file mode 100644
index 000000000000..61c4a61558d9
--- /dev/null
+++ b/drivers/tty/hvc/hvc_rtas.c
@@ -0,0 +1,133 @@
+/*
+ * IBM RTAS driver interface to hvc_console.c
+ *
+ * (C) Copyright IBM Corporation 2001-2005
+ * (C) Copyright Red Hat, Inc. 2005
+ *
+ * Author(s): Maximino Augilar <IBM STI Design Center>
+ *          : Ryan S. Arnold <rsa@us.ibm.com>
+ *          : Utz Bacher <utz.bacher@de.ibm.com>
+ *          : David Woodhouse <dwmw2@infradead.org>
+ *
+ *    inspired by drivers/char/hvc_console.c
+ *    written by Anton Blanchard and Paul Mackerras
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+
+#include <asm/irq.h>
+#include <asm/rtas.h>
+#include "hvc_console.h"
+
+#define hvc_rtas_cookie 0x67781e15
+struct hvc_struct *hvc_rtas_dev;
+
+static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE;
+static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE;
+
+static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf,
+                int count)
+{
+        int i;
+
+        for (i = 0; i < count; i++) {
+                if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i]))
+                        break;
+        }
+
+        return i;
+}
+
+static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count)
+{
+        int i, c;
+
+        for (i = 0; i < count; i++) {
+                if (rtas_call(rtascons_get_char_token, 0, 2, &c))
+                        break;
+
+                buf[i] = c;
+        }
+
+        return i;
+}
+
+static const struct hv_ops hvc_rtas_get_put_ops = {
+        .get_chars = hvc_rtas_read_console,
+        .put_chars = hvc_rtas_write_console,
+};
+
+static int __init hvc_rtas_init(void)
+{
+        struct hvc_struct *hp;
+
+        if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+                rtascons_put_char_token = rtas_token("put-term-char");
+        if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+                return -EIO;
+
+        if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+                rtascons_get_char_token = rtas_token("get-term-char");
+        if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+                return -EIO;
+
+        BUG_ON(hvc_rtas_dev);
+
+        /* Allocate an hvc_struct for the console device we instantiated
+         * earlier.  Save off hp so that we can return it on exit */
+        hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops, 16);
+        if (IS_ERR(hp))
+                return PTR_ERR(hp);
+
+        hvc_rtas_dev = hp;
+
+        return 0;
+}
+module_init(hvc_rtas_init);
+
+/* This will tear down the tty portion of the driver */
+static void __exit hvc_rtas_exit(void)
+{
+        /* Really the fun isn't over until the worker thread breaks down and
+         * the tty cleans up */
+        if (hvc_rtas_dev)
+                hvc_remove(hvc_rtas_dev);
+}
+module_exit(hvc_rtas_exit);
+
+/* This will happen prior to module init.  There is no tty at this time? */
+static int __init hvc_rtas_console_init(void)
+{
+        rtascons_put_char_token = rtas_token("put-term-char");
+        if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE)
+                return -EIO;
+
+        rtascons_get_char_token = rtas_token("get-term-char");
+        if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE)
+                return -EIO;
+
+        hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops);
+        add_preferred_console("hvc", 0, NULL);
+
+        return 0;
+}
+console_initcall(hvc_rtas_console_init);
diff --git a/drivers/tty/hvc/hvc_tile.c b/drivers/tty/hvc/hvc_tile.c
new file mode 100644
index 000000000000..7a84a0595477
--- /dev/null
+++ b/drivers/tty/hvc/hvc_tile.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ * Tilera TILE Processor hypervisor console
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+
+#include <hv/hypervisor.h>
+
+#include "hvc_console.h"
+
+static int hvc_tile_put_chars(uint32_t vt, const char *buf, int count)
+{
+        return hv_console_write((HV_VirtAddr)buf, count);
+}
+
+static int hvc_tile_get_chars(uint32_t vt, char *buf, int count)
+{
+        int i, c;
+
+        for (i = 0; i < count; ++i) {
+                c = hv_console_read_if_ready();
+                if (c < 0)
+                        break;
+                buf[i] = c;
+        }
+
+        return i;
+}
+
+static const struct hv_ops hvc_tile_get_put_ops = {
+        .get_chars = hvc_tile_get_chars,
+        .put_chars = hvc_tile_put_chars,
+};
+
+static int __init hvc_tile_console_init(void)
+{
+        extern void disable_early_printk(void);
+        hvc_instantiate(0, 0, &hvc_tile_get_put_ops);
+        add_preferred_console("hvc", 0, NULL);
+        disable_early_printk();
+        return 0;
+}
+console_initcall(hvc_tile_console_init);
+
+static int __init hvc_tile_init(void)
+{
+        struct hvc_struct *s;
+        s = hvc_alloc(0, 0, &hvc_tile_get_put_ops, 128);
+        return IS_ERR(s) ? PTR_ERR(s) : 0;
+}
+device_initcall(hvc_tile_init);
diff --git a/drivers/tty/hvc/hvc_udbg.c b/drivers/tty/hvc/hvc_udbg.c
new file mode 100644
index 000000000000..b0957e61a7be
--- /dev/null
+++ b/drivers/tty/hvc/hvc_udbg.c
@@ -0,0 +1,96 @@
+/*
+ * udbg interface to hvc_console.c
+ *
+ * (C) Copyright David Gibson, IBM Corporation 2008.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/irq.h>
+
+#include <asm/udbg.h>
+
+#include "hvc_console.h"
+
+struct hvc_struct *hvc_udbg_dev;
+
+static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
+{
+        int i;
+
+        for (i = 0; i < count; i++)
+                udbg_putc(buf[i]);
+
+        return i;
+}
+
+static int hvc_udbg_get(uint32_t vtermno, char *buf, int count)
+{
+        int i, c;
+
+        if (!udbg_getc_poll)
+                return 0;
+
+        for (i = 0; i < count; i++) {
+                if ((c = udbg_getc_poll()) == -1)
+                        break;
+                buf[i] = c;
+        }
+
+        return i;
+}
+
+static const struct hv_ops hvc_udbg_ops = {
+        .get_chars = hvc_udbg_get,
+        .put_chars = hvc_udbg_put,
+};
+
+static int __init hvc_udbg_init(void)
+{
+        struct hvc_struct *hp;
+
+        BUG_ON(hvc_udbg_dev);
+
+        hp = hvc_alloc(0, NO_IRQ, &hvc_udbg_ops, 16);
+        if (IS_ERR(hp))
+                return PTR_ERR(hp);
+
+        hvc_udbg_dev = hp;
+
+        return 0;
+}
+module_init(hvc_udbg_init);
+
+static void __exit hvc_udbg_exit(void)
+{
+        if (hvc_udbg_dev)
+                hvc_remove(hvc_udbg_dev);
+}
+module_exit(hvc_udbg_exit);
+
+static int __init hvc_udbg_console_init(void)
+{
+        hvc_instantiate(0, 0, &hvc_udbg_ops);
+        add_preferred_console("hvc", 0, NULL);
+
+        return 0;
+}
+console_initcall(hvc_udbg_console_init);
diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c
new file mode 100644
index 000000000000..e6eea1485244
--- /dev/null
+++ b/drivers/tty/hvc/hvc_vio.c
@@ -0,0 +1,173 @@
+/*
+ * vio driver interface to hvc_console.c
+ *
+ * This code was moved here to allow the remaining code to be reused as a
+ * generic polling mode with semi-reliable transport driver core to the
+ * console and tty subsystems.
+ *
+ *
+ * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
+ * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
+ * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
+ * Copyright (C) 2004 IBM Corporation
+ *
+ * Additional Author(s):
+ *  Ryan S. Arnold <rsa@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+
+#include <asm/hvconsole.h>
+#include <asm/vio.h>
+#include <asm/prom.h>
+#include <asm/firmware.h>
+
+#include "hvc_console.h"
+
+static const char hvc_driver_name[] = "hvc_console";
+
+static struct vio_device_id hvc_driver_table[] __devinitdata = {
+        {"serial", "hvterm1"},
+        { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, hvc_driver_table);
+
+static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
+{
+        unsigned long got;
+        int i;
+
+        /*
+         * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion
+         * so we play safe and avoid the situation where got > count which could
+         * overload the flip buffer.
+         */
+        if (count < SIZE_VIO_GET_CHARS)
+                return -EAGAIN;
+
+        got = hvc_get_chars(vtermno, buf, count);
+
+        /*
+         * Work around a HV bug where it gives us a null
+         * after every \r.  -- paulus
+         */
+        for (i = 1; i < got; ++i) {
+                if (buf[i] == 0 && buf[i-1] == '\r') {
+                        --got;
+                        if (i < got)
+                                memmove(&buf[i], &buf[i+1],
+                                        got - i);
+                }
+        }
+        return got;
+}
+
+static const struct hv_ops hvc_get_put_ops = {
+        .get_chars = filtered_get_chars,
+        .put_chars = hvc_put_chars,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
+        .notifier_hangup = notifier_hangup_irq,
+};
+
+static int __devinit hvc_vio_probe(struct vio_dev *vdev,
+                                const struct vio_device_id *id)
+{
+        struct hvc_struct *hp;
+
+        /* probed with invalid parameters. */
+        if (!vdev || !id)
+                return -EPERM;
+
+        hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops,
+                        MAX_VIO_PUT_CHARS);
+        if (IS_ERR(hp))
+                return PTR_ERR(hp);
+        dev_set_drvdata(&vdev->dev, hp);
+
+        return 0;
+}
+
+static int __devexit hvc_vio_remove(struct vio_dev *vdev)
+{
+        struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
+
+        return hvc_remove(hp);
+}
+
+static struct vio_driver hvc_vio_driver = {
+        .id_table       = hvc_driver_table,
+        .probe          = hvc_vio_probe,
+        .remove         = __devexit_p(hvc_vio_remove),
+        .driver         = {
+                .name   = hvc_driver_name,
+                .owner  = THIS_MODULE,
+        }
+};
+
+static int __init hvc_vio_init(void)
+{
+        int rc;
+
+        if (firmware_has_feature(FW_FEATURE_ISERIES))
+                return -EIO;
+
+        /* Register as a vio device to receive callbacks */
+        rc = vio_register_driver(&hvc_vio_driver);
+
+        return rc;
+}
+module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
+
+static void __exit hvc_vio_exit(void)
+{
+        vio_unregister_driver(&hvc_vio_driver);
+}
+module_exit(hvc_vio_exit);
+
+/* the device tree order defines our numbering */
+static int hvc_find_vtys(void)
+{
+        struct device_node *vty;
+        int num_found = 0;
+
+        for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
+                        vty = of_find_node_by_name(vty, "vty")) {
+                const uint32_t *vtermno;
+
+                /* We have statically defined space for only a certain number
+                 * of console adapters.
+                 */
+                if (num_found >= MAX_NR_HVC_CONSOLES) {
+                        of_node_put(vty);
+                        break;
+                }
+
+                vtermno = of_get_property(vty, "reg", NULL);
+                if (!vtermno)
+                        continue;
+
+                if (of_device_is_compatible(vty, "hvterm1")) {
+                        hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
+                        ++num_found;
+                }
+        }
+
+        return num_found;
+}
+console_initcall(hvc_find_vtys);
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
new file mode 100644
index 000000000000..52fdf60bdbe2
--- /dev/null
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -0,0 +1,273 @@
+/*
+ * xen console driver interface to hvc_console.c
+ *
+ * (c) 2007 Gerd Hoffmann <kraxel@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/types.h>
+
+#include <asm/xen/hypervisor.h>
+
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/events.h>
+#include <xen/interface/io/console.h>
+#include <xen/hvc-console.h>
+
+#include "hvc_console.h"
+
+#define HVC_COOKIE   0x58656e /* "Xen" in hex */
+
+static struct hvc_struct *hvc;
+static int xencons_irq;
+
+/* ------------------------------------------------------------------ */
+
+static unsigned long console_pfn = ~0ul;
+
+static inline struct xencons_interface *xencons_interface(void)
+{
+        if (console_pfn == ~0ul)
+                return mfn_to_virt(xen_start_info->console.domU.mfn);
+        else
+                return __va(console_pfn << PAGE_SHIFT);
+}
+
+static inline void notify_daemon(void)
+{
+        /* Use evtchn: this is called early, before irq is set up. */
+        notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
+}
+
+static int __write_console(const char *data, int len)
+{
+        struct xencons_interface *intf = xencons_interface();
+        XENCONS_RING_IDX cons, prod;
+        int sent = 0;
+
+        cons = intf->out_cons;
+        prod = intf->out_prod;
+        mb();                   /* update queue values before going on */
+        BUG_ON((prod - cons) > sizeof(intf->out));
+
+        while ((sent < len) && ((prod - cons) < sizeof(intf->out)))
+                intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++];
+
+        wmb();                  /* write ring before updating pointer */
+        intf->out_prod = prod;
+
+        if (sent)
+                notify_daemon();
+        return sent;
+}
+
+static int domU_write_console(uint32_t vtermno, const char *data, int len)
+{
+        int ret = len;
+
+        /*
+         * Make sure the whole buffer is emitted, polling if
+         * necessary.  We don't ever want to rely on the hvc daemon
+         * because the most interesting console output is when the
+         * kernel is crippled.
+         */
+        while (len) {
+                int sent = __write_console(data, len);
+                
+                data += sent;
+                len -= sent;
+
+                if (unlikely(len))
+                        HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
+        }
+
+        return ret;
+}
+
+static int domU_read_console(uint32_t vtermno, char *buf, int len)
+{
+        struct xencons_interface *intf = xencons_interface();
+        XENCONS_RING_IDX cons, prod;
+        int recv = 0;
+
+        cons = intf->in_cons;
+        prod = intf->in_prod;
+        mb();                   /* get pointers before reading ring */
+        BUG_ON((prod - cons) > sizeof(intf->in));
+
+        while (cons != prod && recv < len)
+                buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)];
+
+        mb();                   /* read ring before consuming */
+        intf->in_cons = cons;
+
+        notify_daemon();
+        return recv;
+}
+
+static struct hv_ops domU_hvc_ops = {
+        .get_chars = domU_read_console,
+        .put_chars = domU_write_console,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
+        .notifier_hangup = notifier_hangup_irq,
+};
+
+static int dom0_read_console(uint32_t vtermno, char *buf, int len)
+{
+        return HYPERVISOR_console_io(CONSOLEIO_read, len, buf);
+}
+
+/*
+ * Either for a dom0 to write to the system console, or a domU with a
+ * debug version of Xen
+ */
+static int dom0_write_console(uint32_t vtermno, const char *str, int len)
+{
+        int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
+        if (rc < 0)
+                return 0;
+
+        return len;
+}
+
+static struct hv_ops dom0_hvc_ops = {
+        .get_chars = dom0_read_console,
+        .put_chars = dom0_write_console,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
+        .notifier_hangup = notifier_hangup_irq,
+};
+
+static int __init xen_hvc_init(void)
+{
+        struct hvc_struct *hp;
+        struct hv_ops *ops;
+
+        if (!xen_pv_domain())
+                return -ENODEV;
+
+        if (xen_initial_domain()) {
+                ops = &dom0_hvc_ops;
+                xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
+        } else {
+                if (!xen_start_info->console.domU.evtchn)
+                        return -ENODEV;
+
+                ops = &domU_hvc_ops;
+                xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
+        }
+        if (xencons_irq < 0)
+                xencons_irq = 0; /* NO_IRQ */
+        else
+                irq_set_noprobe(xencons_irq);
+
+        hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256);
+        if (IS_ERR(hp))
+                return PTR_ERR(hp);
+
+        hvc = hp;
+
+        console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
+
+        return 0;
+}
+
+void xen_console_resume(void)
+{
+        if (xencons_irq)
+                rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
+}
+
+static void __exit xen_hvc_fini(void)
+{
+        if (hvc)
+                hvc_remove(hvc);
+}
+
+static int xen_cons_init(void)
+{
+        struct hv_ops *ops;
+
+        if (!xen_pv_domain())
+                return 0;
+
+        if (xen_initial_domain())
+                ops = &dom0_hvc_ops;
+        else
+                ops = &domU_hvc_ops;
+
+        hvc_instantiate(HVC_COOKIE, 0, ops);
+        return 0;
+}
+
+module_init(xen_hvc_init);
+module_exit(xen_hvc_fini);
+console_initcall(xen_cons_init);
+
+#ifdef CONFIG_EARLY_PRINTK
+static void xenboot_write_console(struct console *console, const char *string,
+                                  unsigned len)
+{
+        unsigned int linelen, off = 0;
+        const char *pos;
+
+        dom0_write_console(0, string, len);
+
+        if (xen_initial_domain())
+                return;
+
+        domU_write_console(0, "(early) ", 8);
+        while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
+                linelen = pos-string+off;
+                if (off + linelen > len)
+                        break;
+                domU_write_console(0, string+off, linelen);
+                domU_write_console(0, "\r\n", 2);
+                off += linelen + 1;
+        }
+        if (off < len)
+                domU_write_console(0, string+off, len-off);
+}
+
+struct console xenboot_console = {
+        .name           = "xenboot",
+        .write          = xenboot_write_console,
+        .flags          = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
+};
+#endif  /* CONFIG_EARLY_PRINTK */
+
+void xen_raw_console_write(const char *str)
+{
+        dom0_write_console(0, str, strlen(str));
+}
+
+void xen_raw_printk(const char *fmt, ...)
+{
+        static char buf[512];
+        va_list ap;
+
+        va_start(ap, fmt);
+        vsnprintf(buf, sizeof(buf), fmt, ap);
+        va_end(ap);
+
+        xen_raw_console_write(buf);
+}
diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
new file mode 100644
index 000000000000..4c8b66546930
--- /dev/null
+++ b/drivers/tty/hvc/hvcs.c
@@ -0,0 +1,1616 @@
+/*
+ * IBM eServer Hypervisor Virtual Console Server Device Driver
+ * Copyright (C) 2003, 2004 IBM Corp.
+ *  Ryan S. Arnold (rsa@us.ibm.com)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ * Author(s) :  Ryan S. Arnold <rsa@us.ibm.com>
+ *
+ * This is the device driver for the IBM Hypervisor Virtual Console Server,
+ * "hvcs".  The IBM hvcs provides a tty driver interface to allow Linux
+ * user space applications access to the system consoles of logically
+ * partitioned operating systems, e.g. Linux, running on the same partitioned
+ * Power5 ppc64 system.  Physical hardware consoles per partition are not
+ * practical on this hardware so system consoles are accessed by this driver
+ * using inter-partition firmware interfaces to virtual terminal devices.
+ *
+ * A vty is known to the HMC as a "virtual serial server adapter".  It is a
+ * virtual terminal device that is created by firmware upon partition creation
+ * to act as a partitioned OS's console device.
+ *
+ * Firmware dynamically (via hotplug) exposes vty-servers to a running ppc64
+ * Linux system upon their creation by the HMC or their exposure during boot.
+ * The non-user interactive backend of this driver is implemented as a vio
+ * device driver so that it can receive notification of vty-server lifetimes
+ * after it registers with the vio bus to handle vty-server probe and remove
+ * callbacks.
+ *
+ * Many vty-servers can be configured to connect to one vty, but a vty can
+ * only be actively connected to by a single vty-server, in any manner, at one
+ * time.  If the HMC is currently hosting the console for a target Linux
+ * partition; attempts to open the tty device to the partition's console using
+ * the hvcs on any partition will return -EBUSY with every open attempt until
+ * the HMC frees the connection between its vty-server and the desired
+ * partition's vty device.  Conversely, a vty-server may only be connected to
+ * a single vty at one time even though it may have several configured vty
+ * partner possibilities.
+ *
+ * Firmware does not provide notification of vty partner changes to this
+ * driver.  This means that an HMC Super Admin may add or remove partner vtys
+ * from a vty-server's partner list but the changes will not be signaled to
+ * the vty-server.  Firmware only notifies the driver when a vty-server is
+ * added or removed from the system.  To compensate for this deficiency, this
+ * driver implements a sysfs update attribute which provides a method for
+ * rescanning partner information upon a user's request.
+ *
+ * Each vty-server, prior to being exposed to this driver is reference counted
+ * using the 2.6 Linux kernel kref construct.
+ *
+ * For direction on installation and usage of this driver please reference
+ * Documentation/powerpc/hvcs.txt.
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/major.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <asm/hvconsole.h>
+#include <asm/hvcserver.h>
+#include <asm/uaccess.h>
+#include <asm/vio.h>
+
+/*
+ * 1.3.0 -> 1.3.1 In hvcs_open memset(..,0x00,..) instead of memset(..,0x3F,00).
+ * Removed braces around single statements following conditionals.  Removed '=
+ * 0' after static int declarations since these default to zero.  Removed
+ * list_for_each_safe() and replaced with list_for_each_entry() in
+ * hvcs_get_by_index().  The 'safe' version is un-needed now that the driver is
+ * using spinlocks.  Changed spin_lock_irqsave() to spin_lock() when locking
+ * hvcs_structs_lock and hvcs_pi_lock since these are not touched in an int
+ * handler.  Initialized hvcs_structs_lock and hvcs_pi_lock to
+ * SPIN_LOCK_UNLOCKED at declaration time rather than in hvcs_module_init().
+ * Added spin_lock around list_del() in destroy_hvcs_struct() to protect the
+ * list traversals from a deletion.  Removed '= NULL' from pointer declaration
+ * statements since they are initialized NULL by default.  Removed wmb()
+ * instances from hvcs_try_write().  They probably aren't needed with locking in
+ * place.  Added check and cleanup for hvcs_pi_buff = kmalloc() in
+ * hvcs_module_init().  Exposed hvcs_struct.index via a sysfs attribute so that
+ * the coupling between /dev/hvcs* and a vty-server can be automatically
+ * determined.  Moved kobject_put() in hvcs_open outside of the
+ * spin_unlock_irqrestore().
+ *
+ * 1.3.1 -> 1.3.2 Changed method for determining hvcs_struct->index and had it
+ * align with how the tty layer always assigns the lowest index available.  This
+ * change resulted in a list of ints that denotes which indexes are available.
+ * Device additions and removals use the new hvcs_get_index() and
+ * hvcs_return_index() helper functions.  The list is created with
+ * hvsc_alloc_index_list() and it is destroyed with hvcs_free_index_list().
+ * Without these fixes hotplug vty-server adapter support goes crazy with this
+ * driver if the user removes a vty-server adapter.  Moved free_irq() outside of
+ * the hvcs_final_close() function in order to get it out of the spinlock.
+ * Rearranged hvcs_close().  Cleaned up some printks and did some housekeeping
+ * on the changelog.  Removed local CLC_LENGTH and used HVCS_CLC_LENGTH from
+ * arch/powerepc/include/asm/hvcserver.h
+ *
+ * 1.3.2 -> 1.3.3 Replaced yield() in hvcs_close() with tty_wait_until_sent() to
+ * prevent possible lockup with realtime scheduling as similarly pointed out by
+ * akpm in hvc_console.  Changed resulted in the removal of hvcs_final_close()
+ * to reorder cleanup operations and prevent discarding of pending data during
+ * an hvcs_close().  Removed spinlock protection of hvcs_struct data members in
+ * hvcs_write_room() and hvcs_chars_in_buffer() because they aren't needed.
+ */
+
+#define HVCS_DRIVER_VERSION "1.3.3"
+
+MODULE_AUTHOR("Ryan S. Arnold <rsa@us.ibm.com>");
+MODULE_DESCRIPTION("IBM hvcs (Hypervisor Virtual Console Server) Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(HVCS_DRIVER_VERSION);
+
+/*
+ * Wait this long per iteration while trying to push buffered data to the
+ * hypervisor before allowing the tty to complete a close operation.
+ */
+#define HVCS_CLOSE_WAIT (HZ/100) /* 1/10 of a second */
+
+/*
+ * Since the Linux TTY code does not currently (2-04-2004) support dynamic
+ * addition of tty derived devices and we shouldn't allocate thousands of
+ * tty_device pointers when the number of vty-server & vty partner connections
+ * will most often be much lower than this, we'll arbitrarily allocate
+ * HVCS_DEFAULT_SERVER_ADAPTERS tty_structs and cdev's by default when we
+ * register the tty_driver. This can be overridden using an insmod parameter.
+ */
+#define HVCS_DEFAULT_SERVER_ADAPTERS    64
+
+/*
+ * The user can't insmod with more than HVCS_MAX_SERVER_ADAPTERS hvcs device
+ * nodes as a sanity check.  Theoretically there can be over 1 Billion
+ * vty-server & vty partner connections.
+ */
+#define HVCS_MAX_SERVER_ADAPTERS        1024
+
+/*
+ * We let Linux assign us a major number and we start the minors at zero.  There
+ * is no intuitive mapping between minor number and the target vty-server
+ * adapter except that each new vty-server adapter is always assigned to the
+ * smallest minor number available.
+ */
+#define HVCS_MINOR_START        0
+
+/*
+ * The hcall interface involves putting 8 chars into each of two registers.
+ * We load up those 2 registers (in arch/powerpc/platforms/pseries/hvconsole.c)
+ * by casting char[16] to long[2].  It would work without __ALIGNED__, but a 
+ * little (tiny) bit slower because an unaligned load is slower than aligned 
+ * load.
+ */
+#define __ALIGNED__     __attribute__((__aligned__(8)))
+
+/*
+ * How much data can firmware send with each hvc_put_chars()?  Maybe this
+ * should be moved into an architecture specific area.
+ */
+#define HVCS_BUFF_LEN   16
+
+/*
+ * This is the maximum amount of data we'll let the user send us (hvcs_write) at
+ * once in a chunk as a sanity check.
+ */
+#define HVCS_MAX_FROM_USER      4096
+
+/*
+ * Be careful when adding flags to this line discipline.  Don't add anything
+ * that will cause echoing or we'll go into recursive loop echoing chars back
+ * and forth with the console drivers.
+ */
+static struct ktermios hvcs_tty_termios = {
+        .c_iflag = IGNBRK | IGNPAR,
+        .c_oflag = OPOST,
+        .c_cflag = B38400 | CS8 | CREAD | HUPCL,
+        .c_cc = INIT_C_CC,
+        .c_ispeed = 38400,
+        .c_ospeed = 38400
+};
+
+/*
+ * This value is used to take the place of a command line parameter when the
+ * module is inserted.  It starts as -1 and stays as such if the user doesn't
+ * specify a module insmod parameter.  If they DO specify one then it is set to
+ * the value of the integer passed in.
+ */
+static int hvcs_parm_num_devs = -1;
+module_param(hvcs_parm_num_devs, int, 0);
+
+static const char hvcs_driver_name[] = "hvcs";
+static const char hvcs_device_node[] = "hvcs";
+static const char hvcs_driver_string[]
+        = "IBM hvcs (Hypervisor Virtual Console Server) Driver";
+
+/* Status of partner info rescan triggered via sysfs. */
+static int hvcs_rescan_status;
+
+static struct tty_driver *hvcs_tty_driver;
+
+/*
+ * In order to be somewhat sane this driver always associates the hvcs_struct
+ * index element with the numerically equal tty->index.  This means that a
+ * hotplugged vty-server adapter will always map to the lowest index valued
+ * device node.  If vty-servers were hotplug removed from the system and then
+ * new ones added the new vty-server may have the largest slot number of all
+ * the vty-server adapters in the partition but it may have the lowest dev node
+ * index of all the adapters due to the hole left by the hotplug removed
+ * adapter.  There are a set of functions provided to get the lowest index for
+ * a new device as well as return the index to the list.  This list is allocated
+ * with a number of elements equal to the number of device nodes requested when
+ * the module was inserted.
+ */
+static int *hvcs_index_list;
+
+/*
+ * How large is the list?  This is kept for traversal since the list is
+ * dynamically created.
+ */
+static int hvcs_index_count;
+
+/*
+ * Used by the khvcsd to pick up I/O operations when the kernel_thread is
+ * already awake but potentially shifted to TASK_INTERRUPTIBLE state.
+ */
+static int hvcs_kicked;
+
+/*
+ * Use by the kthread construct for task operations like waking the sleeping
+ * thread and stopping the kthread.
+ */
+static struct task_struct *hvcs_task;
+
+/*
+ * We allocate this for the use of all of the hvcs_structs when they fetch
+ * partner info.
+ */
+static unsigned long *hvcs_pi_buff;
+
+/* Only allow one hvcs_struct to use the hvcs_pi_buff at a time. */
+static DEFINE_SPINLOCK(hvcs_pi_lock);
+
+/* One vty-server per hvcs_struct */
+struct hvcs_struct {
+        spinlock_t lock;
+
+        /*
+         * This index identifies this hvcs device as the complement to a
+         * specific tty index.
+         */
+        unsigned int index;
+
+        struct tty_struct *tty;
+        int open_count;
+
+        /*
+         * Used to tell the driver kernel_thread what operations need to take
+         * place upon this hvcs_struct instance.
+         */
+        int todo_mask;
+
+        /*
+         * This buffer is required so that when hvcs_write_room() reports that
+         * it can send HVCS_BUFF_LEN characters that it will buffer the full
+         * HVCS_BUFF_LEN characters if need be.  This is essential for opost
+         * writes since they do not do high level buffering and expect to be
+         * able to send what the driver commits to sending buffering
+         * [e.g. tab to space conversions in n_tty.c opost()].
+         */
+        char buffer[HVCS_BUFF_LEN];
+        int chars_in_buffer;
+
+        /*
+         * Any variable below the kref is valid before a tty is connected and
+         * stays valid after the tty is disconnected.  These shouldn't be
+         * whacked until the kobject refcount reaches zero though some entries
+         * may be changed via sysfs initiatives.
+         */
+        struct kref kref; /* ref count & hvcs_struct lifetime */
+        int connected; /* is the vty-server currently connected to a vty? */
+        uint32_t p_unit_address; /* partner unit address */
+        uint32_t p_partition_ID; /* partner partition ID */
+        char p_location_code[HVCS_CLC_LENGTH + 1]; /* CLC + Null Term */
+        struct list_head next; /* list management */
+        struct vio_dev *vdev;
+};
+
+/* Required to back map a kref to its containing object */
+#define from_kref(k) container_of(k, struct hvcs_struct, kref)
+
+static LIST_HEAD(hvcs_structs);
+static DEFINE_SPINLOCK(hvcs_structs_lock);
+static DEFINE_MUTEX(hvcs_init_mutex);
+
+static void hvcs_unthrottle(struct tty_struct *tty);
+static void hvcs_throttle(struct tty_struct *tty);
+static irqreturn_t hvcs_handle_interrupt(int irq, void *dev_instance);
+
+static int hvcs_write(struct tty_struct *tty,
+                const unsigned char *buf, int count);
+static int hvcs_write_room(struct tty_struct *tty);
+static int hvcs_chars_in_buffer(struct tty_struct *tty);
+
+static int hvcs_has_pi(struct hvcs_struct *hvcsd);
+static void hvcs_set_pi(struct hvcs_partner_info *pi,
+                struct hvcs_struct *hvcsd);
+static int hvcs_get_pi(struct hvcs_struct *hvcsd);
+static int hvcs_rescan_devices_list(void);
+
+static int hvcs_partner_connect(struct hvcs_struct *hvcsd);
+static void hvcs_partner_free(struct hvcs_struct *hvcsd);
+
+static int hvcs_enable_device(struct hvcs_struct *hvcsd,
+                uint32_t unit_address, unsigned int irq, struct vio_dev *dev);
+
+static int hvcs_open(struct tty_struct *tty, struct file *filp);
+static void hvcs_close(struct tty_struct *tty, struct file *filp);
+static void hvcs_hangup(struct tty_struct * tty);
+
+static int __devinit hvcs_probe(struct vio_dev *dev,
+                const struct vio_device_id *id);
+static int __devexit hvcs_remove(struct vio_dev *dev);
+static int __init hvcs_module_init(void);
+static void __exit hvcs_module_exit(void);
+static int __devinit hvcs_initialize(void);
+
+#define HVCS_SCHED_READ 0x00000001
+#define HVCS_QUICK_READ 0x00000002
+#define HVCS_TRY_WRITE  0x00000004
+#define HVCS_READ_MASK  (HVCS_SCHED_READ | HVCS_QUICK_READ)
+
+static inline struct hvcs_struct *from_vio_dev(struct vio_dev *viod)
+{
+        return dev_get_drvdata(&viod->dev);
+}
+/* The sysfs interface for the driver and devices */
+
+static ssize_t hvcs_partner_vtys_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct vio_dev *viod = to_vio_dev(dev);
+        struct hvcs_struct *hvcsd = from_vio_dev(viod);
+        unsigned long flags;
+        int retval;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        retval = sprintf(buf, "%X\n", hvcsd->p_unit_address);
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        return retval;
+}
+static DEVICE_ATTR(partner_vtys, S_IRUGO, hvcs_partner_vtys_show, NULL);
+
+static ssize_t hvcs_partner_clcs_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct vio_dev *viod = to_vio_dev(dev);
+        struct hvcs_struct *hvcsd = from_vio_dev(viod);
+        unsigned long flags;
+        int retval;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        retval = sprintf(buf, "%s\n", &hvcsd->p_location_code[0]);
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        return retval;
+}
+static DEVICE_ATTR(partner_clcs, S_IRUGO, hvcs_partner_clcs_show, NULL);
+
+static ssize_t hvcs_current_vty_store(struct device *dev, struct device_attribute *attr, const char * buf,
+                size_t count)
+{
+        /*
+         * Don't need this feature at the present time because firmware doesn't
+         * yet support multiple partners.
+         */
+        printk(KERN_INFO "HVCS: Denied current_vty change: -EPERM.\n");
+        return -EPERM;
+}
+
+static ssize_t hvcs_current_vty_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct vio_dev *viod = to_vio_dev(dev);
+        struct hvcs_struct *hvcsd = from_vio_dev(viod);
+        unsigned long flags;
+        int retval;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        retval = sprintf(buf, "%s\n", &hvcsd->p_location_code[0]);
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        return retval;
+}
+
+static DEVICE_ATTR(current_vty,
+        S_IRUGO | S_IWUSR, hvcs_current_vty_show, hvcs_current_vty_store);
+
+static ssize_t hvcs_vterm_state_store(struct device *dev, struct device_attribute *attr, const char *buf,
+                size_t count)
+{
+        struct vio_dev *viod = to_vio_dev(dev);
+        struct hvcs_struct *hvcsd = from_vio_dev(viod);
+        unsigned long flags;
+
+        /* writing a '0' to this sysfs entry will result in the disconnect. */
+        if (simple_strtol(buf, NULL, 0) != 0)
+                return -EINVAL;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+
+        if (hvcsd->open_count > 0) {
+                spin_unlock_irqrestore(&hvcsd->lock, flags);
+                printk(KERN_INFO "HVCS: vterm state unchanged.  "
+                                "The hvcs device node is still in use.\n");
+                return -EPERM;
+        }
+
+        if (hvcsd->connected == 0) {
+                spin_unlock_irqrestore(&hvcsd->lock, flags);
+                printk(KERN_INFO "HVCS: vterm state unchanged. The"
+                                " vty-server is not connected to a vty.\n");
+                return -EPERM;
+        }
+
+        hvcs_partner_free(hvcsd);
+        printk(KERN_INFO "HVCS: Closed vty-server@%X and"
+                        " partner vty@%X:%d connection.\n",
+                        hvcsd->vdev->unit_address,
+                        hvcsd->p_unit_address,
+                        (uint32_t)hvcsd->p_partition_ID);
+
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        return count;
+}
+
+static ssize_t hvcs_vterm_state_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct vio_dev *viod = to_vio_dev(dev);
+        struct hvcs_struct *hvcsd = from_vio_dev(viod);
+        unsigned long flags;
+        int retval;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        retval = sprintf(buf, "%d\n", hvcsd->connected);
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        return retval;
+}
+static DEVICE_ATTR(vterm_state, S_IRUGO | S_IWUSR,
+                hvcs_vterm_state_show, hvcs_vterm_state_store);
+
+static ssize_t hvcs_index_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct vio_dev *viod = to_vio_dev(dev);
+        struct hvcs_struct *hvcsd = from_vio_dev(viod);
+        unsigned long flags;
+        int retval;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        retval = sprintf(buf, "%d\n", hvcsd->index);
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        return retval;
+}
+
+static DEVICE_ATTR(index, S_IRUGO, hvcs_index_show, NULL);
+
+static struct attribute *hvcs_attrs[] = {
+        &dev_attr_partner_vtys.attr,
+        &dev_attr_partner_clcs.attr,
+        &dev_attr_current_vty.attr,
+        &dev_attr_vterm_state.attr,
+        &dev_attr_index.attr,
+        NULL,
+};
+
+static struct attribute_group hvcs_attr_group = {
+        .attrs = hvcs_attrs,
+};
+
+static ssize_t hvcs_rescan_show(struct device_driver *ddp, char *buf)
+{
+        /* A 1 means it is updating, a 0 means it is done updating */
+        return snprintf(buf, PAGE_SIZE, "%d\n", hvcs_rescan_status);
+}
+
+static ssize_t hvcs_rescan_store(struct device_driver *ddp, const char * buf,
+                size_t count)
+{
+        if ((simple_strtol(buf, NULL, 0) != 1)
+                && (hvcs_rescan_status != 0))
+                return -EINVAL;
+
+        hvcs_rescan_status = 1;
+        printk(KERN_INFO "HVCS: rescanning partner info for all"
+                " vty-servers.\n");
+        hvcs_rescan_devices_list();
+        hvcs_rescan_status = 0;
+        return count;
+}
+
+static DRIVER_ATTR(rescan,
+        S_IRUGO | S_IWUSR, hvcs_rescan_show, hvcs_rescan_store);
+
+static void hvcs_kick(void)
+{
+        hvcs_kicked = 1;
+        wmb();
+        wake_up_process(hvcs_task);
+}
+
+static void hvcs_unthrottle(struct tty_struct *tty)
+{
+        struct hvcs_struct *hvcsd = tty->driver_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        hvcsd->todo_mask |= HVCS_SCHED_READ;
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        hvcs_kick();
+}
+
+static void hvcs_throttle(struct tty_struct *tty)
+{
+        struct hvcs_struct *hvcsd = tty->driver_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        vio_disable_interrupts(hvcsd->vdev);
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+}
+
+/*
+ * If the device is being removed we don't have to worry about this interrupt
+ * handler taking any further interrupts because they are disabled which means
+ * the hvcs_struct will always be valid in this handler.
+ */
+static irqreturn_t hvcs_handle_interrupt(int irq, void *dev_instance)
+{
+        struct hvcs_struct *hvcsd = dev_instance;
+
+        spin_lock(&hvcsd->lock);
+        vio_disable_interrupts(hvcsd->vdev);
+        hvcsd->todo_mask |= HVCS_SCHED_READ;
+        spin_unlock(&hvcsd->lock);
+        hvcs_kick();
+
+        return IRQ_HANDLED;
+}
+
+/* This function must be called with the hvcsd->lock held */
+static void hvcs_try_write(struct hvcs_struct *hvcsd)
+{
+        uint32_t unit_address = hvcsd->vdev->unit_address;
+        struct tty_struct *tty = hvcsd->tty;
+        int sent;
+
+        if (hvcsd->todo_mask & HVCS_TRY_WRITE) {
+                /* won't send partial writes */
+                sent = hvc_put_chars(unit_address,
+                                &hvcsd->buffer[0],
+                                hvcsd->chars_in_buffer );
+                if (sent > 0) {
+                        hvcsd->chars_in_buffer = 0;
+                        /* wmb(); */
+                        hvcsd->todo_mask &= ~(HVCS_TRY_WRITE);
+                        /* wmb(); */
+
+                        /*
+                         * We are still obligated to deliver the data to the
+                         * hypervisor even if the tty has been closed because
+                         * we committed to delivering it.  But don't try to wake
+                         * a non-existent tty.
+                         */
+                        if (tty) {
+                                tty_wakeup(tty);
+                        }
+                }
+        }
+}
+
+static int hvcs_io(struct hvcs_struct *hvcsd)
+{
+        uint32_t unit_address;
+        struct tty_struct *tty;
+        char buf[HVCS_BUFF_LEN] __ALIGNED__;
+        unsigned long flags;
+        int got = 0;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+
+        unit_address = hvcsd->vdev->unit_address;
+        tty = hvcsd->tty;
+
+        hvcs_try_write(hvcsd);
+
+        if (!tty || test_bit(TTY_THROTTLED, &tty->flags)) {
+                hvcsd->todo_mask &= ~(HVCS_READ_MASK);
+                goto bail;
+        } else if (!(hvcsd->todo_mask & (HVCS_READ_MASK)))
+                goto bail;
+
+        /* remove the read masks */
+        hvcsd->todo_mask &= ~(HVCS_READ_MASK);
+
+        if (tty_buffer_request_room(tty, HVCS_BUFF_LEN) >= HVCS_BUFF_LEN) {
+                got = hvc_get_chars(unit_address,
+                                &buf[0],
+                                HVCS_BUFF_LEN);
+                tty_insert_flip_string(tty, buf, got);
+        }
+
+        /* Give the TTY time to process the data we just sent. */
+        if (got)
+                hvcsd->todo_mask |= HVCS_QUICK_READ;
+
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        /* This is synch because tty->low_latency == 1 */
+        if(got)
+                tty_flip_buffer_push(tty);
+
+        if (!got) {
+                /* Do this _after_ the flip_buffer_push */
+                spin_lock_irqsave(&hvcsd->lock, flags);
+                vio_enable_interrupts(hvcsd->vdev);
+                spin_unlock_irqrestore(&hvcsd->lock, flags);
+        }
+
+        return hvcsd->todo_mask;
+
+ bail:
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        return hvcsd->todo_mask;
+}
+
+static int khvcsd(void *unused)
+{
+        struct hvcs_struct *hvcsd;
+        int hvcs_todo_mask;
+
+        __set_current_state(TASK_RUNNING);
+
+        do {
+                hvcs_todo_mask = 0;
+                hvcs_kicked = 0;
+                wmb();
+
+                spin_lock(&hvcs_structs_lock);
+                list_for_each_entry(hvcsd, &hvcs_structs, next) {
+                        hvcs_todo_mask |= hvcs_io(hvcsd);
+                }
+                spin_unlock(&hvcs_structs_lock);
+
+                /*
+                 * If any of the hvcs adapters want to try a write or quick read
+                 * don't schedule(), yield a smidgen then execute the hvcs_io
+                 * thread again for those that want the write.
+                 */
+                 if (hvcs_todo_mask & (HVCS_TRY_WRITE | HVCS_QUICK_READ)) {
+                        yield();
+                        continue;
+                }
+
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (!hvcs_kicked)
+                        schedule();
+                __set_current_state(TASK_RUNNING);
+        } while (!kthread_should_stop());
+
+        return 0;
+}
+
+static struct vio_device_id hvcs_driver_table[] __devinitdata= {
+        {"serial-server", "hvterm2"},
+        { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, hvcs_driver_table);
+
+static void hvcs_return_index(int index)
+{
+        /* Paranoia check */
+        if (!hvcs_index_list)
+                return;
+        if (index < 0 || index >= hvcs_index_count)
+                return;
+        if (hvcs_index_list[index] == -1)
+                return;
+        else
+                hvcs_index_list[index] = -1;
+}
+
+/* callback when the kref ref count reaches zero */
+static void destroy_hvcs_struct(struct kref *kref)
+{
+        struct hvcs_struct *hvcsd = from_kref(kref);
+        struct vio_dev *vdev;
+        unsigned long flags;
+
+        spin_lock(&hvcs_structs_lock);
+        spin_lock_irqsave(&hvcsd->lock, flags);
+
+        /* the list_del poisons the pointers */
+        list_del(&(hvcsd->next));
+
+        if (hvcsd->connected == 1) {
+                hvcs_partner_free(hvcsd);
+                printk(KERN_INFO "HVCS: Closed vty-server@%X and"
+                                " partner vty@%X:%d connection.\n",
+                                hvcsd->vdev->unit_address,
+                                hvcsd->p_unit_address,
+                                (uint32_t)hvcsd->p_partition_ID);
+        }
+        printk(KERN_INFO "HVCS: Destroyed hvcs_struct for vty-server@%X.\n",
+                        hvcsd->vdev->unit_address);
+
+        vdev = hvcsd->vdev;
+        hvcsd->vdev = NULL;
+
+        hvcsd->p_unit_address = 0;
+        hvcsd->p_partition_ID = 0;
+        hvcs_return_index(hvcsd->index);
+        memset(&hvcsd->p_location_code[0], 0x00, HVCS_CLC_LENGTH + 1);
+
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        spin_unlock(&hvcs_structs_lock);
+
+        sysfs_remove_group(&vdev->dev.kobj, &hvcs_attr_group);
+
+        kfree(hvcsd);
+}
+
+static int hvcs_get_index(void)
+{
+        int i;
+        /* Paranoia check */
+        if (!hvcs_index_list) {
+                printk(KERN_ERR "HVCS: hvcs_index_list NOT valid!.\n");
+                return -EFAULT;
+        }
+        /* Find the numerically lowest first free index. */
+        for(i = 0; i < hvcs_index_count; i++) {
+                if (hvcs_index_list[i] == -1) {
+                        hvcs_index_list[i] = 0;
+                        return i;
+                }
+        }
+        return -1;
+}
+
+static int __devinit hvcs_probe(
+        struct vio_dev *dev,
+        const struct vio_device_id *id)
+{
+        struct hvcs_struct *hvcsd;
+        int index, rc;
+        int retval;
+
+        if (!dev || !id) {
+                printk(KERN_ERR "HVCS: probed with invalid parameter.\n");
+                return -EPERM;
+        }
+
+        /* Make sure we are properly initialized */
+        rc = hvcs_initialize();
+        if (rc) {
+                pr_err("HVCS: Failed to initialize core driver.\n");
+                return rc;
+        }
+
+        /* early to avoid cleanup on failure */
+        index = hvcs_get_index();
+        if (index < 0) {
+                return -EFAULT;
+        }
+
+        hvcsd = kzalloc(sizeof(*hvcsd), GFP_KERNEL);
+        if (!hvcsd)
+                return -ENODEV;
+
+
+        spin_lock_init(&hvcsd->lock);
+        /* Automatically incs the refcount the first time */
+        kref_init(&hvcsd->kref);
+
+        hvcsd->vdev = dev;
+        dev_set_drvdata(&dev->dev, hvcsd);
+
+        hvcsd->index = index;
+
+        /* hvcsd->index = ++hvcs_struct_count; */
+        hvcsd->chars_in_buffer = 0;
+        hvcsd->todo_mask = 0;
+        hvcsd->connected = 0;
+
+        /*
+         * This will populate the hvcs_struct's partner info fields for the
+         * first time.
+         */
+        if (hvcs_get_pi(hvcsd)) {
+                printk(KERN_ERR "HVCS: Failed to fetch partner"
+                        " info for vty-server@%X on device probe.\n",
+                        hvcsd->vdev->unit_address);
+        }
+
+        /*
+         * If a user app opens a tty that corresponds to this vty-server before
+         * the hvcs_struct has been added to the devices list then the user app
+         * will get -ENODEV.
+         */
+        spin_lock(&hvcs_structs_lock);
+        list_add_tail(&(hvcsd->next), &hvcs_structs);
+        spin_unlock(&hvcs_structs_lock);
+
+        retval = sysfs_create_group(&dev->dev.kobj, &hvcs_attr_group);
+        if (retval) {
+                printk(KERN_ERR "HVCS: Can't create sysfs attrs for vty-server@%X\n",
+                       hvcsd->vdev->unit_address);
+                return retval;
+        }
+
+        printk(KERN_INFO "HVCS: vty-server@%X added to the vio bus.\n", dev->unit_address);
+
+        /*
+         * DON'T enable interrupts here because there is no user to receive the
+         * data.
+         */
+        return 0;
+}
+
+static int __devexit hvcs_remove(struct vio_dev *dev)
+{
+        struct hvcs_struct *hvcsd = dev_get_drvdata(&dev->dev);
+        unsigned long flags;
+        struct tty_struct *tty;
+
+        if (!hvcsd)
+                return -ENODEV;
+
+        /* By this time the vty-server won't be getting any more interrupts */
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+
+        tty = hvcsd->tty;
+
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+
+        /*
+         * Let the last holder of this object cause it to be removed, which
+         * would probably be tty_hangup below.
+         */
+        kref_put(&hvcsd->kref, destroy_hvcs_struct);
+
+        /*
+         * The hangup is a scheduled function which will auto chain call
+         * hvcs_hangup.  The tty should always be valid at this time unless a
+         * simultaneous tty close already cleaned up the hvcs_struct.
+         */
+        if (tty)
+                tty_hangup(tty);
+
+        printk(KERN_INFO "HVCS: vty-server@%X removed from the"
+                        " vio bus.\n", dev->unit_address);
+        return 0;
+};
+
+static struct vio_driver hvcs_vio_driver = {
+        .id_table       = hvcs_driver_table,
+        .probe          = hvcs_probe,
+        .remove         = __devexit_p(hvcs_remove),
+        .driver         = {
+                .name   = hvcs_driver_name,
+                .owner  = THIS_MODULE,
+        }
+};
+
+/* Only called from hvcs_get_pi please */
+static void hvcs_set_pi(struct hvcs_partner_info *pi, struct hvcs_struct *hvcsd)
+{
+        int clclength;
+
+        hvcsd->p_unit_address = pi->unit_address;
+        hvcsd->p_partition_ID  = pi->partition_ID;
+        clclength = strlen(&pi->location_code[0]);
+        if (clclength > HVCS_CLC_LENGTH)
+                clclength = HVCS_CLC_LENGTH;
+
+        /* copy the null-term char too */
+        strncpy(&hvcsd->p_location_code[0],
+                        &pi->location_code[0], clclength + 1);
+}
+
+/*
+ * Traverse the list and add the partner info that is found to the hvcs_struct
+ * struct entry. NOTE: At this time I know that partner info will return a
+ * single entry but in the future there may be multiple partner info entries per
+ * vty-server and you'll want to zero out that list and reset it.  If for some
+ * reason you have an old version of this driver but there IS more than one
+ * partner info then hvcsd->p_* will hold the last partner info data from the
+ * firmware query.  A good way to update this code would be to replace the three
+ * partner info fields in hvcs_struct with a list of hvcs_partner_info
+ * instances.
+ *
+ * This function must be called with the hvcsd->lock held.
+ */
+static int hvcs_get_pi(struct hvcs_struct *hvcsd)
+{
+        struct hvcs_partner_info *pi;
+        uint32_t unit_address = hvcsd->vdev->unit_address;
+        struct list_head head;
+        int retval;
+
+        spin_lock(&hvcs_pi_lock);
+        if (!hvcs_pi_buff) {
+                spin_unlock(&hvcs_pi_lock);
+                return -EFAULT;
+        }
+        retval = hvcs_get_partner_info(unit_address, &head, hvcs_pi_buff);
+        spin_unlock(&hvcs_pi_lock);
+        if (retval) {
+                printk(KERN_ERR "HVCS: Failed to fetch partner"
+                        " info for vty-server@%x.\n", unit_address);
+                return retval;
+        }
+
+        /* nixes the values if the partner vty went away */
+        hvcsd->p_unit_address = 0;
+        hvcsd->p_partition_ID = 0;
+
+        list_for_each_entry(pi, &head, node)
+                hvcs_set_pi(pi, hvcsd);
+
+        hvcs_free_partner_info(&head);
+        return 0;
+}
+
+/*
+ * This function is executed by the driver "rescan" sysfs entry.  It shouldn't
+ * be executed elsewhere, in order to prevent deadlock issues.
+ */
+static int hvcs_rescan_devices_list(void)
+{
+        struct hvcs_struct *hvcsd;
+        unsigned long flags;
+
+        spin_lock(&hvcs_structs_lock);
+
+        list_for_each_entry(hvcsd, &hvcs_structs, next) {
+                spin_lock_irqsave(&hvcsd->lock, flags);
+                hvcs_get_pi(hvcsd);
+                spin_unlock_irqrestore(&hvcsd->lock, flags);
+        }
+
+        spin_unlock(&hvcs_structs_lock);
+
+        return 0;
+}
+
+/*
+ * Farm this off into its own function because it could be more complex once
+ * multiple partners support is added. This function should be called with
+ * the hvcsd->lock held.
+ */
+static int hvcs_has_pi(struct hvcs_struct *hvcsd)
+{
+        if ((!hvcsd->p_unit_address) || (!hvcsd->p_partition_ID))
+                return 0;
+        return 1;
+}
+
+/*
+ * NOTE: It is possible that the super admin removed a partner vty and then
+ * added a different vty as the new partner.
+ *
+ * This function must be called with the hvcsd->lock held.
+ */
+static int hvcs_partner_connect(struct hvcs_struct *hvcsd)
+{
+        int retval;
+        unsigned int unit_address = hvcsd->vdev->unit_address;
+
+        /*
+         * If there wasn't any pi when the device was added it doesn't meant
+         * there isn't any now.  This driver isn't notified when a new partner
+         * vty is added to a vty-server so we discover changes on our own.
+         * Please see comments in hvcs_register_connection() for justification
+         * of this bizarre code.
+         */
+        retval = hvcs_register_connection(unit_address,
+                        hvcsd->p_partition_ID,
+                        hvcsd->p_unit_address);
+        if (!retval) {
+                hvcsd->connected = 1;
+                return 0;
+        } else if (retval != -EINVAL)
+                return retval;
+
+        /*
+         * As per the spec re-get the pi and try again if -EINVAL after the
+         * first connection attempt.
+         */
+        if (hvcs_get_pi(hvcsd))
+                return -ENOMEM;
+
+        if (!hvcs_has_pi(hvcsd))
+                return -ENODEV;
+
+        retval = hvcs_register_connection(unit_address,
+                        hvcsd->p_partition_ID,
+                        hvcsd->p_unit_address);
+        if (retval != -EINVAL) {
+                hvcsd->connected = 1;
+                return retval;
+        }
+
+        /*
+         * EBUSY is the most likely scenario though the vty could have been
+         * removed or there really could be an hcall error due to the parameter
+         * data but thanks to ambiguous firmware return codes we can't really
+         * tell.
+         */
+        printk(KERN_INFO "HVCS: vty-server or partner"
+                        " vty is busy.  Try again later.\n");
+        return -EBUSY;
+}
+
+/* This function must be called with the hvcsd->lock held */
+static void hvcs_partner_free(struct hvcs_struct *hvcsd)
+{
+        int retval;
+        do {
+                retval = hvcs_free_connection(hvcsd->vdev->unit_address);
+        } while (retval == -EBUSY);
+        hvcsd->connected = 0;
+}
+
+/* This helper function must be called WITHOUT the hvcsd->lock held */
+static int hvcs_enable_device(struct hvcs_struct *hvcsd, uint32_t unit_address,
+                unsigned int irq, struct vio_dev *vdev)
+{
+        unsigned long flags;
+        int rc;
+
+        /*
+         * It is possible that the vty-server was removed between the time that
+         * the conn was registered and now.
+         */
+        if (!(rc = request_irq(irq, &hvcs_handle_interrupt,
+                                IRQF_DISABLED, "ibmhvcs", hvcsd))) {
+                /*
+                 * It is possible the vty-server was removed after the irq was
+                 * requested but before we have time to enable interrupts.
+                 */
+                if (vio_enable_interrupts(vdev) == H_SUCCESS)
+                        return 0;
+                else {
+                        printk(KERN_ERR "HVCS: int enable failed for"
+                                        " vty-server@%X.\n", unit_address);
+                        free_irq(irq, hvcsd);
+                }
+        } else
+                printk(KERN_ERR "HVCS: irq req failed for"
+                                " vty-server@%X.\n", unit_address);
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        hvcs_partner_free(hvcsd);
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+
+        return rc;
+
+}
+
+/*
+ * This always increments the kref ref count if the call is successful.
+ * Please remember to dec when you are done with the instance.
+ *
+ * NOTICE: Do NOT hold either the hvcs_struct.lock or hvcs_structs_lock when
+ * calling this function or you will get deadlock.
+ */
+static struct hvcs_struct *hvcs_get_by_index(int index)
+{
+        struct hvcs_struct *hvcsd = NULL;
+        unsigned long flags;
+
+        spin_lock(&hvcs_structs_lock);
+        /* We can immediately discard OOB requests */
+        if (index >= 0 && index < HVCS_MAX_SERVER_ADAPTERS) {
+                list_for_each_entry(hvcsd, &hvcs_structs, next) {
+                        spin_lock_irqsave(&hvcsd->lock, flags);
+                        if (hvcsd->index == index) {
+                                kref_get(&hvcsd->kref);
+                                spin_unlock_irqrestore(&hvcsd->lock, flags);
+                                spin_unlock(&hvcs_structs_lock);
+                                return hvcsd;
+                        }
+                        spin_unlock_irqrestore(&hvcsd->lock, flags);
+                }
+                hvcsd = NULL;
+        }
+
+        spin_unlock(&hvcs_structs_lock);
+        return hvcsd;
+}
+
+/*
+ * This is invoked via the tty_open interface when a user app connects to the
+ * /dev node.
+ */
+static int hvcs_open(struct tty_struct *tty, struct file *filp)
+{
+        struct hvcs_struct *hvcsd;
+        int rc, retval = 0;
+        unsigned long flags;
+        unsigned int irq;
+        struct vio_dev *vdev;
+        unsigned long unit_address;
+
+        if (tty->driver_data)
+                goto fast_open;
+
+        /*
+         * Is there a vty-server that shares the same index?
+         * This function increments the kref index.
+         */
+        if (!(hvcsd = hvcs_get_by_index(tty->index))) {
+                printk(KERN_WARNING "HVCS: open failed, no device associated"
+                                " with tty->index %d.\n", tty->index);
+                return -ENODEV;
+        }
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+
+        if (hvcsd->connected == 0)
+                if ((retval = hvcs_partner_connect(hvcsd)))
+                        goto error_release;
+
+        hvcsd->open_count = 1;
+        hvcsd->tty = tty;
+        tty->driver_data = hvcsd;
+
+        memset(&hvcsd->buffer[0], 0x00, HVCS_BUFF_LEN);
+
+        /*
+         * Save these in the spinlock for the enable operations that need them
+         * outside of the spinlock.
+         */
+        irq = hvcsd->vdev->irq;
+        vdev = hvcsd->vdev;
+        unit_address = hvcsd->vdev->unit_address;
+
+        hvcsd->todo_mask |= HVCS_SCHED_READ;
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+
+        /*
+         * This must be done outside of the spinlock because it requests irqs
+         * and will grab the spinlock and free the connection if it fails.
+         */
+        if (((rc = hvcs_enable_device(hvcsd, unit_address, irq, vdev)))) {
+                kref_put(&hvcsd->kref, destroy_hvcs_struct);
+                printk(KERN_WARNING "HVCS: enable device failed.\n");
+                return rc;
+        }
+
+        goto open_success;
+
+fast_open:
+        hvcsd = tty->driver_data;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        kref_get(&hvcsd->kref);
+        hvcsd->open_count++;
+        hvcsd->todo_mask |= HVCS_SCHED_READ;
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+
+open_success:
+        hvcs_kick();
+
+        printk(KERN_INFO "HVCS: vty-server@%X connection opened.\n",
+                hvcsd->vdev->unit_address );
+
+        return 0;
+
+error_release:
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        kref_put(&hvcsd->kref, destroy_hvcs_struct);
+
+        printk(KERN_WARNING "HVCS: partner connect failed.\n");
+        return retval;
+}
+
+static void hvcs_close(struct tty_struct *tty, struct file *filp)
+{
+        struct hvcs_struct *hvcsd;
+        unsigned long flags;
+        int irq = NO_IRQ;
+
+        /*
+         * Is someone trying to close the file associated with this device after
+         * we have hung up?  If so tty->driver_data wouldn't be valid.
+         */
+        if (tty_hung_up_p(filp))
+                return;
+
+        /*
+         * No driver_data means that this close was probably issued after a
+         * failed hvcs_open by the tty layer's release_dev() api and we can just
+         * exit cleanly.
+         */
+        if (!tty->driver_data)
+                return;
+
+        hvcsd = tty->driver_data;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        if (--hvcsd->open_count == 0) {
+
+                vio_disable_interrupts(hvcsd->vdev);
+
+                /*
+                 * NULL this early so that the kernel_thread doesn't try to
+                 * execute any operations on the TTY even though it is obligated
+                 * to deliver any pending I/O to the hypervisor.
+                 */
+                hvcsd->tty = NULL;
+
+                irq = hvcsd->vdev->irq;
+                spin_unlock_irqrestore(&hvcsd->lock, flags);
+
+                tty_wait_until_sent(tty, HVCS_CLOSE_WAIT);
+
+                /*
+                 * This line is important because it tells hvcs_open that this
+                 * device needs to be re-configured the next time hvcs_open is
+                 * called.
+                 */
+                tty->driver_data = NULL;
+
+                free_irq(irq, hvcsd);
+                kref_put(&hvcsd->kref, destroy_hvcs_struct);
+                return;
+        } else if (hvcsd->open_count < 0) {
+                printk(KERN_ERR "HVCS: vty-server@%X open_count: %d"
+                                " is missmanaged.\n",
+                hvcsd->vdev->unit_address, hvcsd->open_count);
+        }
+
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+        kref_put(&hvcsd->kref, destroy_hvcs_struct);
+}
+
+static void hvcs_hangup(struct tty_struct * tty)
+{
+        struct hvcs_struct *hvcsd = tty->driver_data;
+        unsigned long flags;
+        int temp_open_count;
+        int irq = NO_IRQ;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+        /* Preserve this so that we know how many kref refs to put */
+        temp_open_count = hvcsd->open_count;
+
+        /*
+         * Don't kref put inside the spinlock because the destruction
+         * callback may use the spinlock and it may get called before the
+         * spinlock has been released.
+         */
+        vio_disable_interrupts(hvcsd->vdev);
+
+        hvcsd->todo_mask = 0;
+
+        /* I don't think the tty needs the hvcs_struct pointer after a hangup */
+        hvcsd->tty->driver_data = NULL;
+        hvcsd->tty = NULL;
+
+        hvcsd->open_count = 0;
+
+        /* This will drop any buffered data on the floor which is OK in a hangup
+         * scenario. */
+        memset(&hvcsd->buffer[0], 0x00, HVCS_BUFF_LEN);
+        hvcsd->chars_in_buffer = 0;
+
+        irq = hvcsd->vdev->irq;
+
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+
+        free_irq(irq, hvcsd);
+
+        /*
+         * We need to kref_put() for every open_count we have since the
+         * tty_hangup() function doesn't invoke a close per open connection on a
+         * non-console device.
+         */
+        while(temp_open_count) {
+                --temp_open_count;
+                /*
+                 * The final put will trigger destruction of the hvcs_struct.
+                 * NOTE:  If this hangup was signaled from user space then the
+                 * final put will never happen.
+                 */
+                kref_put(&hvcsd->kref, destroy_hvcs_struct);
+        }
+}
+
+/*
+ * NOTE: This is almost always from_user since user level apps interact with the
+ * /dev nodes. I'm trusting that if hvcs_write gets called and interrupted by
+ * hvcs_remove (which removes the target device and executes tty_hangup()) that
+ * tty_hangup will allow hvcs_write time to complete execution before it
+ * terminates our device.
+ */
+static int hvcs_write(struct tty_struct *tty,
+                const unsigned char *buf, int count)
+{
+        struct hvcs_struct *hvcsd = tty->driver_data;
+        unsigned int unit_address;
+        const unsigned char *charbuf;
+        unsigned long flags;
+        int total_sent = 0;
+        int tosend = 0;
+        int result = 0;
+
+        /*
+         * If they don't check the return code off of their open they may
+         * attempt this even if there is no connected device.
+         */
+        if (!hvcsd)
+                return -ENODEV;
+
+        /* Reasonable size to prevent user level flooding */
+        if (count > HVCS_MAX_FROM_USER) {
+                printk(KERN_WARNING "HVCS write: count being truncated to"
+                                " HVCS_MAX_FROM_USER.\n");
+                count = HVCS_MAX_FROM_USER;
+        }
+
+        charbuf = buf;
+
+        spin_lock_irqsave(&hvcsd->lock, flags);
+
+        /*
+         * Somehow an open succeeded but the device was removed or the
+         * connection terminated between the vty-server and partner vty during
+         * the middle of a write operation?  This is a crummy place to do this
+         * but we want to keep it all in the spinlock.
+         */
+        if (hvcsd->open_count <= 0) {
+                spin_unlock_irqrestore(&hvcsd->lock, flags);
+                return -ENODEV;
+        }
+
+        unit_address = hvcsd->vdev->unit_address;
+
+        while (count > 0) {
+                tosend = min(count, (HVCS_BUFF_LEN - hvcsd->chars_in_buffer));
+                /*
+                 * No more space, this probably means that the last call to
+                 * hvcs_write() didn't succeed and the buffer was filled up.
+                 */
+                if (!tosend)
+                        break;
+
+                memcpy(&hvcsd->buffer[hvcsd->chars_in_buffer],
+                                &charbuf[total_sent],
+                                tosend);
+
+                hvcsd->chars_in_buffer += tosend;
+
+                result = 0;
+
+                /*
+                 * If this is true then we don't want to try writing to the
+                 * hypervisor because that is the kernel_threads job now.  We'll
+                 * just add to the buffer.
+                 */
+                if (!(hvcsd->todo_mask & HVCS_TRY_WRITE))
+                        /* won't send partial writes */
+                        result = hvc_put_chars(unit_address,
+                                        &hvcsd->buffer[0],
+                                        hvcsd->chars_in_buffer);
+
+                /*
+                 * Since we know we have enough room in hvcsd->buffer for
+                 * tosend we record that it was sent regardless of whether the
+                 * hypervisor actually took it because we have it buffered.
+                 */
+                total_sent+=tosend;
+                count-=tosend;
+                if (result == 0) {
+                        hvcsd->todo_mask |= HVCS_TRY_WRITE;
+                        hvcs_kick();
+                        break;
+                }
+
+                hvcsd->chars_in_buffer = 0;
+                /*
+                 * Test after the chars_in_buffer reset otherwise this could
+                 * deadlock our writes if hvc_put_chars fails.
+                 */
+                if (result < 0)
+                        break;
+        }
+
+        spin_unlock_irqrestore(&hvcsd->lock, flags);
+
+        if (result == -1)
+                return -EIO;
+        else
+                return total_sent;
+}
+
+/*
+ * This is really asking how much can we guarantee that we can send or that we
+ * absolutely WILL BUFFER if we can't send it.  This driver MUST honor the
+ * return value, hence the reason for hvcs_struct buffering.
+ */
+static int hvcs_write_room(struct tty_struct *tty)
+{
+        struct hvcs_struct *hvcsd = tty->driver_data;
+
+        if (!hvcsd || hvcsd->open_count <= 0)
+                return 0;
+
+        return HVCS_BUFF_LEN - hvcsd->chars_in_buffer;
+}
+
+static int hvcs_chars_in_buffer(struct tty_struct *tty)
+{
+        struct hvcs_struct *hvcsd = tty->driver_data;
+
+        return hvcsd->chars_in_buffer;
+}
+
+static const struct tty_operations hvcs_ops = {
+        .open = hvcs_open,
+        .close = hvcs_close,
+        .hangup = hvcs_hangup,
+        .write = hvcs_write,
+        .write_room = hvcs_write_room,
+        .chars_in_buffer = hvcs_chars_in_buffer,
+        .unthrottle = hvcs_unthrottle,
+        .throttle = hvcs_throttle,
+};
+
+static int hvcs_alloc_index_list(int n)
+{
+        int i;
+
+        hvcs_index_list = kmalloc(n * sizeof(hvcs_index_count),GFP_KERNEL);
+        if (!hvcs_index_list)
+                return -ENOMEM;
+        hvcs_index_count = n;
+        for (i = 0; i < hvcs_index_count; i++)
+                hvcs_index_list[i] = -1;
+        return 0;
+}
+
+static void hvcs_free_index_list(void)
+{
+        /* Paranoia check to be thorough. */
+        kfree(hvcs_index_list);
+        hvcs_index_list = NULL;
+        hvcs_index_count = 0;
+}
+
+static int __devinit hvcs_initialize(void)
+{
+        int rc, num_ttys_to_alloc;
+
+        mutex_lock(&hvcs_init_mutex);
+        if (hvcs_task) {
+                mutex_unlock(&hvcs_init_mutex);
+                return 0;
+        }
+
+        /* Has the user specified an overload with an insmod param? */
+        if (hvcs_parm_num_devs <= 0 ||
+                (hvcs_parm_num_devs > HVCS_MAX_SERVER_ADAPTERS)) {
+                num_ttys_to_alloc = HVCS_DEFAULT_SERVER_ADAPTERS;
+        } else
+                num_ttys_to_alloc = hvcs_parm_num_devs;
+
+        hvcs_tty_driver = alloc_tty_driver(num_ttys_to_alloc);
+        if (!hvcs_tty_driver)
+                return -ENOMEM;
+
+        if (hvcs_alloc_index_list(num_ttys_to_alloc)) {
+                rc = -ENOMEM;
+                goto index_fail;
+        }
+
+        hvcs_tty_driver->owner = THIS_MODULE;
+
+        hvcs_tty_driver->driver_name = hvcs_driver_name;
+        hvcs_tty_driver->name = hvcs_device_node;
+
+        /*
+         * We'll let the system assign us a major number, indicated by leaving
+         * it blank.
+         */
+
+        hvcs_tty_driver->minor_start = HVCS_MINOR_START;
+        hvcs_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM;
+
+        /*
+         * We role our own so that we DONT ECHO.  We can't echo because the
+         * device we are connecting to already echoes by default and this would
+         * throw us into a horrible recursive echo-echo-echo loop.
+         */
+        hvcs_tty_driver->init_termios = hvcs_tty_termios;
+        hvcs_tty_driver->flags = TTY_DRIVER_REAL_RAW;
+
+        tty_set_operations(hvcs_tty_driver, &hvcs_ops);
+
+        /*
+         * The following call will result in sysfs entries that denote the
+         * dynamically assigned major and minor numbers for our devices.
+         */
+        if (tty_register_driver(hvcs_tty_driver)) {
+                printk(KERN_ERR "HVCS: registration as a tty driver failed.\n");
+                rc = -EIO;
+                goto register_fail;
+        }
+
+        hvcs_pi_buff = kmalloc(PAGE_SIZE, GFP_KERNEL);
+        if (!hvcs_pi_buff) {
+                rc = -ENOMEM;
+                goto buff_alloc_fail;
+        }
+
+        hvcs_task = kthread_run(khvcsd, NULL, "khvcsd");
+        if (IS_ERR(hvcs_task)) {
+                printk(KERN_ERR "HVCS: khvcsd creation failed.\n");
+                rc = -EIO;
+                goto kthread_fail;
+        }
+        mutex_unlock(&hvcs_init_mutex);
+        return 0;
+
+kthread_fail:
+        kfree(hvcs_pi_buff);
+buff_alloc_fail:
+        tty_unregister_driver(hvcs_tty_driver);
+register_fail:
+        hvcs_free_index_list();
+index_fail:
+        put_tty_driver(hvcs_tty_driver);
+        hvcs_tty_driver = NULL;
+        mutex_unlock(&hvcs_init_mutex);
+        return rc;
+}
+
+static int __init hvcs_module_init(void)
+{
+        int rc = vio_register_driver(&hvcs_vio_driver);
+        if (rc) {
+                printk(KERN_ERR "HVCS: can't register vio driver\n");
+                return rc;
+        }
+
+        pr_info("HVCS: Driver registered.\n");
+
+        /* This needs to be done AFTER the vio_register_driver() call or else
+         * the kobjects won't be initialized properly.
+         */
+        rc = driver_create_file(&(hvcs_vio_driver.driver), &driver_attr_rescan);
+        if (rc)
+                pr_warning(KERN_ERR "HVCS: Failed to create rescan file (err %d)\n", rc);
+
+        return 0;
+}
+
+static void __exit hvcs_module_exit(void)
+{
+        /*
+         * This driver receives hvcs_remove callbacks for each device upon
+         * module removal.
+         */
+        vio_unregister_driver(&hvcs_vio_driver);
+        if (!hvcs_task)
+                return;
+
+        /*
+         * This synchronous operation  will wake the khvcsd kthread if it is
+         * asleep and will return when khvcsd has terminated.
+         */
+        kthread_stop(hvcs_task);
+
+        spin_lock(&hvcs_pi_lock);
+        kfree(hvcs_pi_buff);
+        hvcs_pi_buff = NULL;
+        spin_unlock(&hvcs_pi_lock);
+
+        driver_remove_file(&hvcs_vio_driver.driver, &driver_attr_rescan);
+
+        tty_unregister_driver(hvcs_tty_driver);
+
+        hvcs_free_index_list();
+
+        put_tty_driver(hvcs_tty_driver);
+
+        printk(KERN_INFO "HVCS: driver module removed.\n");
+}
+
+module_init(hvcs_module_init);
+module_exit(hvcs_module_exit);
diff --git a/drivers/tty/hvc/hvsi.c b/drivers/tty/hvc/hvsi.c
new file mode 100644
index 000000000000..8a8d6373f164
--- /dev/null
+++ b/drivers/tty/hvc/hvsi.c
@@ -0,0 +1,1314 @@
+/*
+ * Copyright (C) 2004 Hollis Blanchard <hollisb@us.ibm.com>, IBM
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+/* Host Virtual Serial Interface (HVSI) is a protocol between the hosted OS
+ * and the service processor on IBM pSeries servers. On these servers, there
+ * are no serial ports under the OS's control, and sometimes there is no other
+ * console available either. However, the service processor has two standard
+ * serial ports, so this over-complicated protocol allows the OS to control
+ * those ports by proxy.
+ *
+ * Besides data, the procotol supports the reading/writing of the serial
+ * port's DTR line, and the reading of the CD line. This is to allow the OS to
+ * control a modem attached to the service processor's serial port. Note that
+ * the OS cannot change the speed of the port through this protocol.
+ */
+
+#undef DEBUG
+
+#include <linux/console.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/major.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <asm/hvcall.h>
+#include <asm/hvconsole.h>
+#include <asm/prom.h>
+#include <asm/uaccess.h>
+#include <asm/vio.h>
+#include <asm/param.h>
+
+#define HVSI_MAJOR      229
+#define HVSI_MINOR      128
+#define MAX_NR_HVSI_CONSOLES 4
+
+#define HVSI_TIMEOUT (5*HZ)
+#define HVSI_VERSION 1
+#define HVSI_MAX_PACKET 256
+#define HVSI_MAX_READ 16
+#define HVSI_MAX_OUTGOING_DATA 12
+#define N_OUTBUF 12
+
+/*
+ * we pass data via two 8-byte registers, so we would like our char arrays
+ * properly aligned for those loads.
+ */
+#define __ALIGNED__     __attribute__((__aligned__(sizeof(long))))
+
+struct hvsi_struct {
+        struct delayed_work writer;
+        struct work_struct handshaker;
+        wait_queue_head_t emptyq; /* woken when outbuf is emptied */
+        wait_queue_head_t stateq; /* woken when HVSI state changes */
+        spinlock_t lock;
+        int index;
+        struct tty_struct *tty;
+        int count;
+        uint8_t throttle_buf[128];
+        uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */
+        /* inbuf is for packet reassembly. leave a little room for leftovers. */
+        uint8_t inbuf[HVSI_MAX_PACKET + HVSI_MAX_READ];
+        uint8_t *inbuf_end;
+        int n_throttle;
+        int n_outbuf;
+        uint32_t vtermno;
+        uint32_t virq;
+        atomic_t seqno; /* HVSI packet sequence number */
+        uint16_t mctrl;
+        uint8_t state;  /* HVSI protocol state */
+        uint8_t flags;
+#ifdef CONFIG_MAGIC_SYSRQ
+        uint8_t sysrq;
+#endif /* CONFIG_MAGIC_SYSRQ */
+};
+static struct hvsi_struct hvsi_ports[MAX_NR_HVSI_CONSOLES];
+
+static struct tty_driver *hvsi_driver;
+static int hvsi_count;
+static int (*hvsi_wait)(struct hvsi_struct *hp, int state);
+
+enum HVSI_PROTOCOL_STATE {
+        HVSI_CLOSED,
+        HVSI_WAIT_FOR_VER_RESPONSE,
+        HVSI_WAIT_FOR_VER_QUERY,
+        HVSI_OPEN,
+        HVSI_WAIT_FOR_MCTRL_RESPONSE,
+        HVSI_FSP_DIED,
+};
+#define HVSI_CONSOLE 0x1
+
+#define VS_DATA_PACKET_HEADER           0xff
+#define VS_CONTROL_PACKET_HEADER        0xfe
+#define VS_QUERY_PACKET_HEADER          0xfd
+#define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc
+
+/* control verbs */
+#define VSV_SET_MODEM_CTL    1 /* to service processor only */
+#define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */
+#define VSV_CLOSE_PROTOCOL   3
+
+/* query verbs */
+#define VSV_SEND_VERSION_NUMBER 1
+#define VSV_SEND_MODEM_CTL_STATUS 2
+
+/* yes, these masks are not consecutive. */
+#define HVSI_TSDTR 0x01
+#define HVSI_TSCD  0x20
+
+struct hvsi_header {
+        uint8_t  type;
+        uint8_t  len;
+        uint16_t seqno;
+} __attribute__((packed));
+
+struct hvsi_data {
+        uint8_t  type;
+        uint8_t  len;
+        uint16_t seqno;
+        uint8_t  data[HVSI_MAX_OUTGOING_DATA];
+} __attribute__((packed));
+
+struct hvsi_control {
+        uint8_t  type;
+        uint8_t  len;
+        uint16_t seqno;
+        uint16_t verb;
+        /* optional depending on verb: */
+        uint32_t word;
+        uint32_t mask;
+} __attribute__((packed));
+
+struct hvsi_query {
+        uint8_t  type;
+        uint8_t  len;
+        uint16_t seqno;
+        uint16_t verb;
+} __attribute__((packed));
+
+struct hvsi_query_response {
+        uint8_t  type;
+        uint8_t  len;
+        uint16_t seqno;
+        uint16_t verb;
+        uint16_t query_seqno;
+        union {
+                uint8_t  version;
+                uint32_t mctrl_word;
+        } u;
+} __attribute__((packed));
+
+
+
+static inline int is_console(struct hvsi_struct *hp)
+{
+        return hp->flags & HVSI_CONSOLE;
+}
+
+static inline int is_open(struct hvsi_struct *hp)
+{
+        /* if we're waiting for an mctrl then we're already open */
+        return (hp->state == HVSI_OPEN)
+                        || (hp->state == HVSI_WAIT_FOR_MCTRL_RESPONSE);
+}
+
+static inline void print_state(struct hvsi_struct *hp)
+{
+#ifdef DEBUG
+        static const char *state_names[] = {
+                "HVSI_CLOSED",
+                "HVSI_WAIT_FOR_VER_RESPONSE",
+                "HVSI_WAIT_FOR_VER_QUERY",
+                "HVSI_OPEN",
+                "HVSI_WAIT_FOR_MCTRL_RESPONSE",
+                "HVSI_FSP_DIED",
+        };
+        const char *name = (hp->state < ARRAY_SIZE(state_names))
+                ? state_names[hp->state] : "UNKNOWN";
+
+        pr_debug("hvsi%i: state = %s\n", hp->index, name);
+#endif /* DEBUG */
+}
+
+static inline void __set_state(struct hvsi_struct *hp, int state)
+{
+        hp->state = state;
+        print_state(hp);
+        wake_up_all(&hp->stateq);
+}
+
+static inline void set_state(struct hvsi_struct *hp, int state)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&hp->lock, flags);
+        __set_state(hp, state);
+        spin_unlock_irqrestore(&hp->lock, flags);
+}
+
+static inline int len_packet(const uint8_t *packet)
+{
+        return (int)((struct hvsi_header *)packet)->len;
+}
+
+static inline int is_header(const uint8_t *packet)
+{
+        struct hvsi_header *header = (struct hvsi_header *)packet;
+        return header->type >= VS_QUERY_RESPONSE_PACKET_HEADER;
+}
+
+static inline int got_packet(const struct hvsi_struct *hp, uint8_t *packet)
+{
+        if (hp->inbuf_end < packet + sizeof(struct hvsi_header))
+                return 0; /* don't even have the packet header */
+
+        if (hp->inbuf_end < (packet + len_packet(packet)))
+                return 0; /* don't have the rest of the packet */
+
+        return 1;
+}
+
+/* shift remaining bytes in packetbuf down */
+static void compact_inbuf(struct hvsi_struct *hp, uint8_t *read_to)
+{
+        int remaining = (int)(hp->inbuf_end - read_to);
+
+        pr_debug("%s: %i chars remain\n", __func__, remaining);
+
+        if (read_to != hp->inbuf)
+                memmove(hp->inbuf, read_to, remaining);
+
+        hp->inbuf_end = hp->inbuf + remaining;
+}
+
+#ifdef DEBUG
+#define dbg_dump_packet(packet) dump_packet(packet)
+#define dbg_dump_hex(data, len) dump_hex(data, len)
+#else
+#define dbg_dump_packet(packet) do { } while (0)
+#define dbg_dump_hex(data, len) do { } while (0)
+#endif
+
+static void dump_hex(const uint8_t *data, int len)
+{
+        int i;
+
+        printk("    ");
+        for (i=0; i < len; i++)
+                printk("%.2x", data[i]);
+
+        printk("\n    ");
+        for (i=0; i < len; i++) {
+                if (isprint(data[i]))
+                        printk("%c", data[i]);
+                else
+                        printk(".");
+        }
+        printk("\n");
+}
+
+static void dump_packet(uint8_t *packet)
+{
+        struct hvsi_header *header = (struct hvsi_header *)packet;
+
+        printk("type 0x%x, len %i, seqno %i:\n", header->type, header->len,
+                        header->seqno);
+
+        dump_hex(packet, header->len);
+}
+
+static int hvsi_read(struct hvsi_struct *hp, char *buf, int count)
+{
+        unsigned long got;
+
+        got = hvc_get_chars(hp->vtermno, buf, count);
+
+        return got;
+}
+
+static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet,
+        struct tty_struct **to_hangup, struct hvsi_struct **to_handshake)
+{
+        struct hvsi_control *header = (struct hvsi_control *)packet;
+
+        switch (header->verb) {
+                case VSV_MODEM_CTL_UPDATE:
+                        if ((header->word & HVSI_TSCD) == 0) {
+                                /* CD went away; no more connection */
+                                pr_debug("hvsi%i: CD dropped\n", hp->index);
+                                hp->mctrl &= TIOCM_CD;
+                                /* If userland hasn't done an open(2) yet, hp->tty is NULL. */
+                                if (hp->tty && !(hp->tty->flags & CLOCAL))
+                                        *to_hangup = hp->tty;
+                        }
+                        break;
+                case VSV_CLOSE_PROTOCOL:
+                        pr_debug("hvsi%i: service processor came back\n", hp->index);
+                        if (hp->state != HVSI_CLOSED) {
+                                *to_handshake = hp;
+                        }
+                        break;
+                default:
+                        printk(KERN_WARNING "hvsi%i: unknown HVSI control packet: ",
+                                hp->index);
+                        dump_packet(packet);
+                        break;
+        }
+}
+
+static void hvsi_recv_response(struct hvsi_struct *hp, uint8_t *packet)
+{
+        struct hvsi_query_response *resp = (struct hvsi_query_response *)packet;
+
+        switch (hp->state) {
+                case HVSI_WAIT_FOR_VER_RESPONSE:
+                        __set_state(hp, HVSI_WAIT_FOR_VER_QUERY);
+                        break;
+                case HVSI_WAIT_FOR_MCTRL_RESPONSE:
+                        hp->mctrl = 0;
+                        if (resp->u.mctrl_word & HVSI_TSDTR)
+                                hp->mctrl |= TIOCM_DTR;
+                        if (resp->u.mctrl_word & HVSI_TSCD)
+                                hp->mctrl |= TIOCM_CD;
+                        __set_state(hp, HVSI_OPEN);
+                        break;
+                default:
+                        printk(KERN_ERR "hvsi%i: unexpected query response: ", hp->index);
+                        dump_packet(packet);
+                        break;
+        }
+}
+
+/* respond to service processor's version query */
+static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno)
+{
+        struct hvsi_query_response packet __ALIGNED__;
+        int wrote;
+
+        packet.type = VS_QUERY_RESPONSE_PACKET_HEADER;
+        packet.len = sizeof(struct hvsi_query_response);
+        packet.seqno = atomic_inc_return(&hp->seqno);
+        packet.verb = VSV_SEND_VERSION_NUMBER;
+        packet.u.version = HVSI_VERSION;
+        packet.query_seqno = query_seqno+1;
+
+        pr_debug("%s: sending %i bytes\n", __func__, packet.len);
+        dbg_dump_hex((uint8_t*)&packet, packet.len);
+
+        wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
+        if (wrote != packet.len) {
+                printk(KERN_ERR "hvsi%i: couldn't send query response!\n",
+                        hp->index);
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet)
+{
+        struct hvsi_query *query = (struct hvsi_query *)packet;
+
+        switch (hp->state) {
+                case HVSI_WAIT_FOR_VER_QUERY:
+                        hvsi_version_respond(hp, query->seqno);
+                        __set_state(hp, HVSI_OPEN);
+                        break;
+                default:
+                        printk(KERN_ERR "hvsi%i: unexpected query: ", hp->index);
+                        dump_packet(packet);
+                        break;
+        }
+}
+
+static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len)
+{
+        int i;
+
+        for (i=0; i < len; i++) {
+                char c = buf[i];
+#ifdef CONFIG_MAGIC_SYSRQ
+                if (c == '\0') {
+                        hp->sysrq = 1;
+                        continue;
+                } else if (hp->sysrq) {
+                        handle_sysrq(c);
+                        hp->sysrq = 0;
+                        continue;
+                }
+#endif /* CONFIG_MAGIC_SYSRQ */
+                tty_insert_flip_char(hp->tty, c, 0);
+        }
+}
+
+/*
+ * We could get 252 bytes of data at once here. But the tty layer only
+ * throttles us at TTY_THRESHOLD_THROTTLE (128) bytes, so we could overflow
+ * it. Accordingly we won't send more than 128 bytes at a time to the flip
+ * buffer, which will give the tty buffer a chance to throttle us. Should the
+ * value of TTY_THRESHOLD_THROTTLE change in n_tty.c, this code should be
+ * revisited.
+ */
+#define TTY_THRESHOLD_THROTTLE 128
+static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp,
+                const uint8_t *packet)
+{
+        const struct hvsi_header *header = (const struct hvsi_header *)packet;
+        const uint8_t *data = packet + sizeof(struct hvsi_header);
+        int datalen = header->len - sizeof(struct hvsi_header);
+        int overflow = datalen - TTY_THRESHOLD_THROTTLE;
+
+        pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data);
+
+        if (datalen == 0)
+                return NULL;
+
+        if (overflow > 0) {
+                pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __func__);
+                datalen = TTY_THRESHOLD_THROTTLE;
+        }
+
+        hvsi_insert_chars(hp, data, datalen);
+
+        if (overflow > 0) {
+                /*
+                 * we still have more data to deliver, so we need to save off the
+                 * overflow and send it later
+                 */
+                pr_debug("%s: deferring overflow\n", __func__);
+                memcpy(hp->throttle_buf, data + TTY_THRESHOLD_THROTTLE, overflow);
+                hp->n_throttle = overflow;
+        }
+
+        return hp->tty;
+}
+
+/*
+ * Returns true/false indicating data successfully read from hypervisor.
+ * Used both to get packets for tty connections and to advance the state
+ * machine during console handshaking (in which case tty = NULL and we ignore
+ * incoming data).
+ */
+static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip,
+                struct tty_struct **hangup, struct hvsi_struct **handshake)
+{
+        uint8_t *packet = hp->inbuf;
+        int chunklen;
+
+        *flip = NULL;
+        *hangup = NULL;
+        *handshake = NULL;
+
+        chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ);
+        if (chunklen == 0) {
+                pr_debug("%s: 0-length read\n", __func__);
+                return 0;
+        }
+
+        pr_debug("%s: got %i bytes\n", __func__, chunklen);
+        dbg_dump_hex(hp->inbuf_end, chunklen);
+
+        hp->inbuf_end += chunklen;
+
+        /* handle all completed packets */
+        while ((packet < hp->inbuf_end) && got_packet(hp, packet)) {
+                struct hvsi_header *header = (struct hvsi_header *)packet;
+
+                if (!is_header(packet)) {
+                        printk(KERN_ERR "hvsi%i: got malformed packet\n", hp->index);
+                        /* skip bytes until we find a header or run out of data */
+                        while ((packet < hp->inbuf_end) && (!is_header(packet)))
+                                packet++;
+                        continue;
+                }
+
+                pr_debug("%s: handling %i-byte packet\n", __func__,
+                                len_packet(packet));
+                dbg_dump_packet(packet);
+
+                switch (header->type) {
+                        case VS_DATA_PACKET_HEADER:
+                                if (!is_open(hp))
+                                        break;
+                                if (hp->tty == NULL)
+                                        break; /* no tty buffer to put data in */
+                                *flip = hvsi_recv_data(hp, packet);
+                                break;
+                        case VS_CONTROL_PACKET_HEADER:
+                                hvsi_recv_control(hp, packet, hangup, handshake);
+                                break;
+                        case VS_QUERY_RESPONSE_PACKET_HEADER:
+                                hvsi_recv_response(hp, packet);
+                                break;
+                        case VS_QUERY_PACKET_HEADER:
+                                hvsi_recv_query(hp, packet);
+                                break;
+                        default:
+                                printk(KERN_ERR "hvsi%i: unknown HVSI packet type 0x%x\n",
+                                                hp->index, header->type);
+                                dump_packet(packet);
+                                break;
+                }
+
+                packet += len_packet(packet);
+
+                if (*hangup || *handshake) {
+                        pr_debug("%s: hangup or handshake\n", __func__);
+                        /*
+                         * we need to send the hangup now before receiving any more data.
+                         * If we get "data, hangup, data", we can't deliver the second
+                         * data before the hangup.
+                         */
+                        break;
+                }
+        }
+
+        compact_inbuf(hp, packet);
+
+        return 1;
+}
+
+static void hvsi_send_overflow(struct hvsi_struct *hp)
+{
+        pr_debug("%s: delivering %i bytes overflow\n", __func__,
+                        hp->n_throttle);
+
+        hvsi_insert_chars(hp, hp->throttle_buf, hp->n_throttle);
+        hp->n_throttle = 0;
+}
+
+/*
+ * must get all pending data because we only get an irq on empty->non-empty
+ * transition
+ */
+static irqreturn_t hvsi_interrupt(int irq, void *arg)
+{
+        struct hvsi_struct *hp = (struct hvsi_struct *)arg;
+        struct tty_struct *flip;
+        struct tty_struct *hangup;
+        struct hvsi_struct *handshake;
+        unsigned long flags;
+        int again = 1;
+
+        pr_debug("%s\n", __func__);
+
+        while (again) {
+                spin_lock_irqsave(&hp->lock, flags);
+                again = hvsi_load_chunk(hp, &flip, &hangup, &handshake);
+                spin_unlock_irqrestore(&hp->lock, flags);
+
+                /*
+                 * we have to call tty_flip_buffer_push() and tty_hangup() outside our
+                 * spinlock. But we also have to keep going until we've read all the
+                 * available data.
+                 */
+
+                if (flip) {
+                        /* there was data put in the tty flip buffer */
+                        tty_flip_buffer_push(flip);
+                        flip = NULL;
+                }
+
+                if (hangup) {
+                        tty_hangup(hangup);
+                }
+
+                if (handshake) {
+                        pr_debug("hvsi%i: attempting re-handshake\n", handshake->index);
+                        schedule_work(&handshake->handshaker);
+                }
+        }
+
+        spin_lock_irqsave(&hp->lock, flags);
+        if (hp->tty && hp->n_throttle
+                        && (!test_bit(TTY_THROTTLED, &hp->tty->flags))) {
+                /* we weren't hung up and we weren't throttled, so we can deliver the
+                 * rest now */
+                flip = hp->tty;
+                hvsi_send_overflow(hp);
+        }
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        if (flip) {
+                tty_flip_buffer_push(flip);
+        }
+
+        return IRQ_HANDLED;
+}
+
+/* for boot console, before the irq handler is running */
+static int __init poll_for_state(struct hvsi_struct *hp, int state)
+{
+        unsigned long end_jiffies = jiffies + HVSI_TIMEOUT;
+
+        for (;;) {
+                hvsi_interrupt(hp->virq, (void *)hp); /* get pending data */
+
+                if (hp->state == state)
+                        return 0;
+
+                mdelay(5);
+                if (time_after(jiffies, end_jiffies))
+                        return -EIO;
+        }
+}
+
+/* wait for irq handler to change our state */
+static int wait_for_state(struct hvsi_struct *hp, int state)
+{
+        int ret = 0;
+
+        if (!wait_event_timeout(hp->stateq, (hp->state == state), HVSI_TIMEOUT))
+                ret = -EIO;
+
+        return ret;
+}
+
+static int hvsi_query(struct hvsi_struct *hp, uint16_t verb)
+{
+        struct hvsi_query packet __ALIGNED__;
+        int wrote;
+
+        packet.type = VS_QUERY_PACKET_HEADER;
+        packet.len = sizeof(struct hvsi_query);
+        packet.seqno = atomic_inc_return(&hp->seqno);
+        packet.verb = verb;
+
+        pr_debug("%s: sending %i bytes\n", __func__, packet.len);
+        dbg_dump_hex((uint8_t*)&packet, packet.len);
+
+        wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
+        if (wrote != packet.len) {
+                printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index,
+                        wrote);
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static int hvsi_get_mctrl(struct hvsi_struct *hp)
+{
+        int ret;
+
+        set_state(hp, HVSI_WAIT_FOR_MCTRL_RESPONSE);
+        hvsi_query(hp, VSV_SEND_MODEM_CTL_STATUS);
+
+        ret = hvsi_wait(hp, HVSI_OPEN);
+        if (ret < 0) {
+                printk(KERN_ERR "hvsi%i: didn't get modem flags\n", hp->index);
+                set_state(hp, HVSI_OPEN);
+                return ret;
+        }
+
+        pr_debug("%s: mctrl 0x%x\n", __func__, hp->mctrl);
+
+        return 0;
+}
+
+/* note that we can only set DTR */
+static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl)
+{
+        struct hvsi_control packet __ALIGNED__;
+        int wrote;
+
+        packet.type = VS_CONTROL_PACKET_HEADER,
+        packet.seqno = atomic_inc_return(&hp->seqno);
+        packet.len = sizeof(struct hvsi_control);
+        packet.verb = VSV_SET_MODEM_CTL;
+        packet.mask = HVSI_TSDTR;
+
+        if (mctrl & TIOCM_DTR)
+                packet.word = HVSI_TSDTR;
+
+        pr_debug("%s: sending %i bytes\n", __func__, packet.len);
+        dbg_dump_hex((uint8_t*)&packet, packet.len);
+
+        wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
+        if (wrote != packet.len) {
+                printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index);
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static void hvsi_drain_input(struct hvsi_struct *hp)
+{
+        uint8_t buf[HVSI_MAX_READ] __ALIGNED__;
+        unsigned long end_jiffies = jiffies + HVSI_TIMEOUT;
+
+        while (time_before(end_jiffies, jiffies))
+                if (0 == hvsi_read(hp, buf, HVSI_MAX_READ))
+                        break;
+}
+
+static int hvsi_handshake(struct hvsi_struct *hp)
+{
+        int ret;
+
+        /*
+         * We could have a CLOSE or other data waiting for us before we even try
+         * to open; try to throw it all away so we don't get confused. (CLOSE
+         * is the first message sent up the pipe when the FSP comes online. We
+         * need to distinguish between "it came up a while ago and we're the first
+         * user" and "it was just reset before it saw our handshake packet".)
+         */
+        hvsi_drain_input(hp);
+
+        set_state(hp, HVSI_WAIT_FOR_VER_RESPONSE);
+        ret = hvsi_query(hp, VSV_SEND_VERSION_NUMBER);
+        if (ret < 0) {
+                printk(KERN_ERR "hvsi%i: couldn't send version query\n", hp->index);
+                return ret;
+        }
+
+        ret = hvsi_wait(hp, HVSI_OPEN);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static void hvsi_handshaker(struct work_struct *work)
+{
+        struct hvsi_struct *hp =
+                container_of(work, struct hvsi_struct, handshaker);
+
+        if (hvsi_handshake(hp) >= 0)
+                return;
+
+        printk(KERN_ERR "hvsi%i: re-handshaking failed\n", hp->index);
+        if (is_console(hp)) {
+                /*
+                 * ttys will re-attempt the handshake via hvsi_open, but
+                 * the console will not.
+                 */
+                printk(KERN_ERR "hvsi%i: lost console!\n", hp->index);
+        }
+}
+
+static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count)
+{
+        struct hvsi_data packet __ALIGNED__;
+        int ret;
+
+        BUG_ON(count > HVSI_MAX_OUTGOING_DATA);
+
+        packet.type = VS_DATA_PACKET_HEADER;
+        packet.seqno = atomic_inc_return(&hp->seqno);
+        packet.len = count + sizeof(struct hvsi_header);
+        memcpy(&packet.data, buf, count);
+
+        ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
+        if (ret == packet.len) {
+                /* return the number of chars written, not the packet length */
+                return count;
+        }
+        return ret; /* return any errors */
+}
+
+static void hvsi_close_protocol(struct hvsi_struct *hp)
+{
+        struct hvsi_control packet __ALIGNED__;
+
+        packet.type = VS_CONTROL_PACKET_HEADER;
+        packet.seqno = atomic_inc_return(&hp->seqno);
+        packet.len = 6;
+        packet.verb = VSV_CLOSE_PROTOCOL;
+
+        pr_debug("%s: sending %i bytes\n", __func__, packet.len);
+        dbg_dump_hex((uint8_t*)&packet, packet.len);
+
+        hvc_put_chars(hp->vtermno, (char *)&packet, packet.len);
+}
+
+static int hvsi_open(struct tty_struct *tty, struct file *filp)
+{
+        struct hvsi_struct *hp;
+        unsigned long flags;
+        int line = tty->index;
+        int ret;
+
+        pr_debug("%s\n", __func__);
+
+        if (line < 0 || line >= hvsi_count)
+                return -ENODEV;
+        hp = &hvsi_ports[line];
+
+        tty->driver_data = hp;
+
+        mb();
+        if (hp->state == HVSI_FSP_DIED)
+                return -EIO;
+
+        spin_lock_irqsave(&hp->lock, flags);
+        hp->tty = tty;
+        hp->count++;
+        atomic_set(&hp->seqno, 0);
+        h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        if (is_console(hp))
+                return 0; /* this has already been handshaked as the console */
+
+        ret = hvsi_handshake(hp);
+        if (ret < 0) {
+                printk(KERN_ERR "%s: HVSI handshaking failed\n", tty->name);
+                return ret;
+        }
+
+        ret = hvsi_get_mctrl(hp);
+        if (ret < 0) {
+                printk(KERN_ERR "%s: couldn't get initial modem flags\n", tty->name);
+                return ret;
+        }
+
+        ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR);
+        if (ret < 0) {
+                printk(KERN_ERR "%s: couldn't set DTR\n", tty->name);
+                return ret;
+        }
+
+        return 0;
+}
+
+/* wait for hvsi_write_worker to empty hp->outbuf */
+static void hvsi_flush_output(struct hvsi_struct *hp)
+{
+        wait_event_timeout(hp->emptyq, (hp->n_outbuf <= 0), HVSI_TIMEOUT);
+
+        /* 'writer' could still be pending if it didn't see n_outbuf = 0 yet */
+        cancel_delayed_work_sync(&hp->writer);
+        flush_work_sync(&hp->handshaker);
+
+        /*
+         * it's also possible that our timeout expired and hvsi_write_worker
+         * didn't manage to push outbuf. poof.
+         */
+        hp->n_outbuf = 0;
+}
+
+static void hvsi_close(struct tty_struct *tty, struct file *filp)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+        unsigned long flags;
+
+        pr_debug("%s\n", __func__);
+
+        if (tty_hung_up_p(filp))
+                return;
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        if (--hp->count == 0) {
+                hp->tty = NULL;
+                hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */
+
+                /* only close down connection if it is not the console */
+                if (!is_console(hp)) {
+                        h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); /* no more irqs */
+                        __set_state(hp, HVSI_CLOSED);
+                        /*
+                         * any data delivered to the tty layer after this will be
+                         * discarded (except for XON/XOFF)
+                         */
+                        tty->closing = 1;
+
+                        spin_unlock_irqrestore(&hp->lock, flags);
+
+                        /* let any existing irq handlers finish. no more will start. */
+                        synchronize_irq(hp->virq);
+
+                        /* hvsi_write_worker will re-schedule until outbuf is empty. */
+                        hvsi_flush_output(hp);
+
+                        /* tell FSP to stop sending data */
+                        hvsi_close_protocol(hp);
+
+                        /*
+                         * drain anything FSP is still in the middle of sending, and let
+                         * hvsi_handshake drain the rest on the next open.
+                         */
+                        hvsi_drain_input(hp);
+
+                        spin_lock_irqsave(&hp->lock, flags);
+                }
+        } else if (hp->count < 0)
+                printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n",
+                       hp - hvsi_ports, hp->count);
+
+        spin_unlock_irqrestore(&hp->lock, flags);
+}
+
+static void hvsi_hangup(struct tty_struct *tty)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+        unsigned long flags;
+
+        pr_debug("%s\n", __func__);
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        hp->count = 0;
+        hp->n_outbuf = 0;
+        hp->tty = NULL;
+
+        spin_unlock_irqrestore(&hp->lock, flags);
+}
+
+/* called with hp->lock held */
+static void hvsi_push(struct hvsi_struct *hp)
+{
+        int n;
+
+        if (hp->n_outbuf <= 0)
+                return;
+
+        n = hvsi_put_chars(hp, hp->outbuf, hp->n_outbuf);
+        if (n > 0) {
+                /* success */
+                pr_debug("%s: wrote %i chars\n", __func__, n);
+                hp->n_outbuf = 0;
+        } else if (n == -EIO) {
+                __set_state(hp, HVSI_FSP_DIED);
+                printk(KERN_ERR "hvsi%i: service processor died\n", hp->index);
+        }
+}
+
+/* hvsi_write_worker will keep rescheduling itself until outbuf is empty */
+static void hvsi_write_worker(struct work_struct *work)
+{
+        struct hvsi_struct *hp =
+                container_of(work, struct hvsi_struct, writer.work);
+        unsigned long flags;
+#ifdef DEBUG
+        static long start_j = 0;
+
+        if (start_j == 0)
+                start_j = jiffies;
+#endif /* DEBUG */
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf);
+
+        if (!is_open(hp)) {
+                /*
+                 * We could have a non-open connection if the service processor died
+                 * while we were busily scheduling ourselves. In that case, it could
+                 * be minutes before the service processor comes back, so only try
+                 * again once a second.
+                 */
+                schedule_delayed_work(&hp->writer, HZ);
+                goto out;
+        }
+
+        hvsi_push(hp);
+        if (hp->n_outbuf > 0)
+                schedule_delayed_work(&hp->writer, 10);
+        else {
+#ifdef DEBUG
+                pr_debug("%s: outbuf emptied after %li jiffies\n", __func__,
+                                jiffies - start_j);
+                start_j = 0;
+#endif /* DEBUG */
+                wake_up_all(&hp->emptyq);
+                tty_wakeup(hp->tty);
+        }
+
+out:
+        spin_unlock_irqrestore(&hp->lock, flags);
+}
+
+static int hvsi_write_room(struct tty_struct *tty)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+
+        return N_OUTBUF - hp->n_outbuf;
+}
+
+static int hvsi_chars_in_buffer(struct tty_struct *tty)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+
+        return hp->n_outbuf;
+}
+
+static int hvsi_write(struct tty_struct *tty,
+                     const unsigned char *buf, int count)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+        const char *source = buf;
+        unsigned long flags;
+        int total = 0;
+        int origcount = count;
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf);
+
+        if (!is_open(hp)) {
+                /* we're either closing or not yet open; don't accept data */
+                pr_debug("%s: not open\n", __func__);
+                goto out;
+        }
+
+        /*
+         * when the hypervisor buffer (16K) fills, data will stay in hp->outbuf
+         * and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls
+         * will see there is no room in outbuf and return.
+         */
+        while ((count > 0) && (hvsi_write_room(hp->tty) > 0)) {
+                int chunksize = min(count, hvsi_write_room(hp->tty));
+
+                BUG_ON(hp->n_outbuf < 0);
+                memcpy(hp->outbuf + hp->n_outbuf, source, chunksize);
+                hp->n_outbuf += chunksize;
+
+                total += chunksize;
+                source += chunksize;
+                count -= chunksize;
+                hvsi_push(hp);
+        }
+
+        if (hp->n_outbuf > 0) {
+                /*
+                 * we weren't able to write it all to the hypervisor.
+                 * schedule another push attempt.
+                 */
+                schedule_delayed_work(&hp->writer, 10);
+        }
+
+out:
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        if (total != origcount)
+                pr_debug("%s: wanted %i, only wrote %i\n", __func__, origcount,
+                        total);
+
+        return total;
+}
+
+/*
+ * I have never seen throttle or unthrottle called, so this little throttle
+ * buffering scheme may or may not work.
+ */
+static void hvsi_throttle(struct tty_struct *tty)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+
+        pr_debug("%s\n", __func__);
+
+        h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE);
+}
+
+static void hvsi_unthrottle(struct tty_struct *tty)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+        unsigned long flags;
+        int shouldflip = 0;
+
+        pr_debug("%s\n", __func__);
+
+        spin_lock_irqsave(&hp->lock, flags);
+        if (hp->n_throttle) {
+                hvsi_send_overflow(hp);
+                shouldflip = 1;
+        }
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        if (shouldflip)
+                tty_flip_buffer_push(hp->tty);
+
+        h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE);
+}
+
+static int hvsi_tiocmget(struct tty_struct *tty)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+
+        hvsi_get_mctrl(hp);
+        return hp->mctrl;
+}
+
+static int hvsi_tiocmset(struct tty_struct *tty,
+                                unsigned int set, unsigned int clear)
+{
+        struct hvsi_struct *hp = tty->driver_data;
+        unsigned long flags;
+        uint16_t new_mctrl;
+
+        /* we can only alter DTR */
+        clear &= TIOCM_DTR;
+        set &= TIOCM_DTR;
+
+        spin_lock_irqsave(&hp->lock, flags);
+
+        new_mctrl = (hp->mctrl & ~clear) | set;
+
+        if (hp->mctrl != new_mctrl) {
+                hvsi_set_mctrl(hp, new_mctrl);
+                hp->mctrl = new_mctrl;
+        }
+        spin_unlock_irqrestore(&hp->lock, flags);
+
+        return 0;
+}
+
+
+static const struct tty_operations hvsi_ops = {
+        .open = hvsi_open,
+        .close = hvsi_close,
+        .write = hvsi_write,
+        .hangup = hvsi_hangup,
+        .write_room = hvsi_write_room,
+        .chars_in_buffer = hvsi_chars_in_buffer,
+        .throttle = hvsi_throttle,
+        .unthrottle = hvsi_unthrottle,
+        .tiocmget = hvsi_tiocmget,
+        .tiocmset = hvsi_tiocmset,
+};
+
+static int __init hvsi_init(void)
+{
+        int i;
+
+        hvsi_driver = alloc_tty_driver(hvsi_count);
+        if (!hvsi_driver)
+                return -ENOMEM;
+
+        hvsi_driver->owner = THIS_MODULE;
+        hvsi_driver->driver_name = "hvsi";
+        hvsi_driver->name = "hvsi";
+        hvsi_driver->major = HVSI_MAJOR;
+        hvsi_driver->minor_start = HVSI_MINOR;
+        hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM;
+        hvsi_driver->init_termios = tty_std_termios;
+        hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
+        hvsi_driver->init_termios.c_ispeed = 9600;
+        hvsi_driver->init_termios.c_ospeed = 9600;
+        hvsi_driver->flags = TTY_DRIVER_REAL_RAW;
+        tty_set_operations(hvsi_driver, &hvsi_ops);
+
+        for (i=0; i < hvsi_count; i++) {
+                struct hvsi_struct *hp = &hvsi_ports[i];
+                int ret = 1;
+
+                ret = request_irq(hp->virq, hvsi_interrupt, IRQF_DISABLED, "hvsi", hp);
+                if (ret)
+                        printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n",
+                                hp->virq, ret);
+        }
+        hvsi_wait = wait_for_state; /* irqs active now */
+
+        if (tty_register_driver(hvsi_driver))
+                panic("Couldn't register hvsi console driver\n");
+
+        printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count);
+
+        return 0;
+}
+device_initcall(hvsi_init);
+
+/***** console (not tty) code: *****/
+
+static void hvsi_console_print(struct console *console, const char *buf,
+                unsigned int count)
+{
+        struct hvsi_struct *hp = &hvsi_ports[console->index];
+        char c[HVSI_MAX_OUTGOING_DATA] __ALIGNED__;
+        unsigned int i = 0, n = 0;
+        int ret, donecr = 0;
+
+        mb();
+        if (!is_open(hp))
+                return;
+
+        /*
+         * ugh, we have to translate LF -> CRLF ourselves, in place.
+         * copied from hvc_console.c:
+         */
+        while (count > 0 || i > 0) {
+                if (count > 0 && i < sizeof(c)) {
+                        if (buf[n] == '\n' && !donecr) {
+                                c[i++] = '\r';
+                                donecr = 1;
+                        } else {
+                                c[i++] = buf[n++];
+                                donecr = 0;
+                                --count;
+                        }
+                } else {
+                        ret = hvsi_put_chars(hp, c, i);
+                        if (ret < 0)
+                                i = 0;
+                        i -= ret;
+                }
+        }
+}
+
+static struct tty_driver *hvsi_console_device(struct console *console,
+        int *index)
+{
+        *index = console->index;
+        return hvsi_driver;
+}
+
+static int __init hvsi_console_setup(struct console *console, char *options)
+{
+        struct hvsi_struct *hp;
+        int ret;
+
+        if (console->index < 0 || console->index >= hvsi_count)
+                return -1;
+        hp = &hvsi_ports[console->index];
+
+        /* give the FSP a chance to change the baud rate when we re-open */
+        hvsi_close_protocol(hp);
+
+        ret = hvsi_handshake(hp);
+        if (ret < 0)
+                return ret;
+
+        ret = hvsi_get_mctrl(hp);
+        if (ret < 0)
+                return ret;
+
+        ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR);
+        if (ret < 0)
+                return ret;
+
+        hp->flags |= HVSI_CONSOLE;
+
+        return 0;
+}
+
+static struct console hvsi_console = {
+        .name           = "hvsi",
+        .write          = hvsi_console_print,
+        .device         = hvsi_console_device,
+        .setup          = hvsi_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+};
+
+static int __init hvsi_console_init(void)
+{
+        struct device_node *vty;
+
+        hvsi_wait = poll_for_state; /* no irqs yet; must poll */
+
+        /* search device tree for vty nodes */
+        for (vty = of_find_compatible_node(NULL, "serial", "hvterm-protocol");
+                        vty != NULL;
+                        vty = of_find_compatible_node(vty, "serial", "hvterm-protocol")) {
+                struct hvsi_struct *hp;
+                const uint32_t *vtermno, *irq;
+
+                vtermno = of_get_property(vty, "reg", NULL);
+                irq = of_get_property(vty, "interrupts", NULL);
+                if (!vtermno || !irq)
+                        continue;
+
+                if (hvsi_count >= MAX_NR_HVSI_CONSOLES) {
+                        of_node_put(vty);
+                        break;
+                }
+
+                hp = &hvsi_ports[hvsi_count];
+                INIT_DELAYED_WORK(&hp->writer, hvsi_write_worker);
+                INIT_WORK(&hp->handshaker, hvsi_handshaker);
+                init_waitqueue_head(&hp->emptyq);
+                init_waitqueue_head(&hp->stateq);
+                spin_lock_init(&hp->lock);
+                hp->index = hvsi_count;
+                hp->inbuf_end = hp->inbuf;
+                hp->state = HVSI_CLOSED;
+                hp->vtermno = *vtermno;
+                hp->virq = irq_create_mapping(NULL, irq[0]);
+                if (hp->virq == NO_IRQ) {
+                        printk(KERN_ERR "%s: couldn't create irq mapping for 0x%x\n",
+                                __func__, irq[0]);
+                        continue;
+                }
+
+                hvsi_count++;
+        }
+
+        if (hvsi_count)
+                register_console(&hvsi_console);
+        return 0;
+}
+console_initcall(hvsi_console_init);
diff --git a/drivers/tty/ipwireless/Makefile b/drivers/tty/ipwireless/Makefile
new file mode 100644
index 000000000000..fe2e1730986b
--- /dev/null
+++ b/drivers/tty/ipwireless/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for the IPWireless driver
+#
+
+obj-$(CONFIG_IPWIRELESS) += ipwireless.o
+
+ipwireless-y := hardware.o main.o network.o tty.o
+
diff --git a/drivers/tty/ipwireless/hardware.c b/drivers/tty/ipwireless/hardware.c
new file mode 100644
index 000000000000..0aeb5a38d296
--- /dev/null
+++ b/drivers/tty/ipwireless/hardware.c
@@ -0,0 +1,1764 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+#include "hardware.h"
+#include "setup_protocol.h"
+#include "network.h"
+#include "main.h"
+
+static void ipw_send_setup_packet(struct ipw_hardware *hw);
+static void handle_received_SETUP_packet(struct ipw_hardware *ipw,
+                                         unsigned int address,
+                                         const unsigned char *data, int len,
+                                         int is_last);
+static void ipwireless_setup_timer(unsigned long data);
+static void handle_received_CTRL_packet(struct ipw_hardware *hw,
+                unsigned int channel_idx, const unsigned char *data, int len);
+
+/*#define TIMING_DIAGNOSTICS*/
+
+#ifdef TIMING_DIAGNOSTICS
+
+static struct timing_stats {
+        unsigned long last_report_time;
+        unsigned long read_time;
+        unsigned long write_time;
+        unsigned long read_bytes;
+        unsigned long write_bytes;
+        unsigned long start_time;
+};
+
+static void start_timing(void)
+{
+        timing_stats.start_time = jiffies;
+}
+
+static void end_read_timing(unsigned length)
+{
+        timing_stats.read_time += (jiffies - start_time);
+        timing_stats.read_bytes += length + 2;
+        report_timing();
+}
+
+static void end_write_timing(unsigned length)
+{
+        timing_stats.write_time += (jiffies - start_time);
+        timing_stats.write_bytes += length + 2;
+        report_timing();
+}
+
+static void report_timing(void)
+{
+        unsigned long since = jiffies - timing_stats.last_report_time;
+
+        /* If it's been more than one second... */
+        if (since >= HZ) {
+                int first = (timing_stats.last_report_time == 0);
+
+                timing_stats.last_report_time = jiffies;
+                if (!first)
+                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                               ": %u us elapsed - read %lu bytes in %u us, wrote %lu bytes in %u us\n",
+                               jiffies_to_usecs(since),
+                               timing_stats.read_bytes,
+                               jiffies_to_usecs(timing_stats.read_time),
+                               timing_stats.write_bytes,
+                               jiffies_to_usecs(timing_stats.write_time));
+
+                timing_stats.read_time = 0;
+                timing_stats.write_time = 0;
+                timing_stats.read_bytes = 0;
+                timing_stats.write_bytes = 0;
+        }
+}
+#else
+static void start_timing(void) { }
+static void end_read_timing(unsigned length) { }
+static void end_write_timing(unsigned length) { }
+#endif
+
+/* Imported IPW definitions */
+
+#define LL_MTU_V1 318
+#define LL_MTU_V2 250
+#define LL_MTU_MAX (LL_MTU_V1 > LL_MTU_V2 ? LL_MTU_V1 : LL_MTU_V2)
+
+#define PRIO_DATA  2
+#define PRIO_CTRL  1
+#define PRIO_SETUP 0
+
+/* Addresses */
+#define ADDR_SETUP_PROT 0
+
+/* Protocol ids */
+enum {
+        /* Identifier for the Com Data protocol */
+        TL_PROTOCOLID_COM_DATA = 0,
+
+        /* Identifier for the Com Control protocol */
+        TL_PROTOCOLID_COM_CTRL = 1,
+
+        /* Identifier for the Setup protocol */
+        TL_PROTOCOLID_SETUP = 2
+};
+
+/* Number of bytes in NL packet header (cannot do
+ * sizeof(nl_packet_header) since it's a bitfield) */
+#define NL_FIRST_PACKET_HEADER_SIZE        3
+
+/* Number of bytes in NL packet header (cannot do
+ * sizeof(nl_packet_header) since it's a bitfield) */
+#define NL_FOLLOWING_PACKET_HEADER_SIZE    1
+
+struct nl_first_packet_header {
+        unsigned char protocol:3;
+        unsigned char address:3;
+        unsigned char packet_rank:2;
+        unsigned char length_lsb;
+        unsigned char length_msb;
+};
+
+struct nl_packet_header {
+        unsigned char protocol:3;
+        unsigned char address:3;
+        unsigned char packet_rank:2;
+};
+
+/* Value of 'packet_rank' above */
+#define NL_INTERMEDIATE_PACKET    0x0
+#define NL_LAST_PACKET            0x1
+#define NL_FIRST_PACKET           0x2
+
+union nl_packet {
+        /* Network packet header of the first packet (a special case) */
+        struct nl_first_packet_header hdr_first;
+        /* Network packet header of the following packets (if any) */
+        struct nl_packet_header hdr;
+        /* Complete network packet (header + data) */
+        unsigned char rawpkt[LL_MTU_MAX];
+} __attribute__ ((__packed__));
+
+#define HW_VERSION_UNKNOWN -1
+#define HW_VERSION_1 1
+#define HW_VERSION_2 2
+
+/* IPW I/O ports */
+#define IOIER 0x00              /* Interrupt Enable Register */
+#define IOIR  0x02              /* Interrupt Source/ACK register */
+#define IODCR 0x04              /* Data Control Register */
+#define IODRR 0x06              /* Data Read Register */
+#define IODWR 0x08              /* Data Write Register */
+#define IOESR 0x0A              /* Embedded Driver Status Register */
+#define IORXR 0x0C              /* Rx Fifo Register (Host to Embedded) */
+#define IOTXR 0x0E              /* Tx Fifo Register (Embedded to Host) */
+
+/* I/O ports and bit definitions for version 1 of the hardware */
+
+/* IER bits*/
+#define IER_RXENABLED   0x1
+#define IER_TXENABLED   0x2
+
+/* ISR bits */
+#define IR_RXINTR       0x1
+#define IR_TXINTR       0x2
+
+/* DCR bits */
+#define DCR_RXDONE      0x1
+#define DCR_TXDONE      0x2
+#define DCR_RXRESET     0x4
+#define DCR_TXRESET     0x8
+
+/* I/O ports and bit definitions for version 2 of the hardware */
+
+struct MEMCCR {
+        unsigned short reg_config_option;       /* PCCOR: Configuration Option Register */
+        unsigned short reg_config_and_status;   /* PCCSR: Configuration and Status Register */
+        unsigned short reg_pin_replacement;     /* PCPRR: Pin Replacemant Register */
+        unsigned short reg_socket_and_copy;     /* PCSCR: Socket and Copy Register */
+        unsigned short reg_ext_status;          /* PCESR: Extendend Status Register */
+        unsigned short reg_io_base;             /* PCIOB: I/O Base Register */
+};
+
+struct MEMINFREG {
+        unsigned short memreg_tx_old;   /* TX Register (R/W) */
+        unsigned short pad1;
+        unsigned short memreg_rx_done;  /* RXDone Register (R/W) */
+        unsigned short pad2;
+        unsigned short memreg_rx;       /* RX Register (R/W) */
+        unsigned short pad3;
+        unsigned short memreg_pc_interrupt_ack; /* PC intr Ack Register (W) */
+        unsigned short pad4;
+        unsigned long memreg_card_present;/* Mask for Host to check (R) for
+                                           * CARD_PRESENT_VALUE */
+        unsigned short memreg_tx_new;   /* TX2 (new) Register (R/W) */
+};
+
+#define CARD_PRESENT_VALUE (0xBEEFCAFEUL)
+
+#define MEMTX_TX                       0x0001
+#define MEMRX_RX                       0x0001
+#define MEMRX_RX_DONE                  0x0001
+#define MEMRX_PCINTACKK                0x0001
+
+#define NL_NUM_OF_PRIORITIES       3
+#define NL_NUM_OF_PROTOCOLS        3
+#define NL_NUM_OF_ADDRESSES        NO_OF_IPW_CHANNELS
+
+struct ipw_hardware {
+        unsigned int base_port;
+        short hw_version;
+        unsigned short ll_mtu;
+        spinlock_t lock;
+
+        int initializing;
+        int init_loops;
+        struct timer_list setup_timer;
+
+        /* Flag if hw is ready to send next packet */
+        int tx_ready;
+        /* Count of pending packets to be sent */
+        int tx_queued;
+        struct list_head tx_queue[NL_NUM_OF_PRIORITIES];
+
+        int rx_bytes_queued;
+        struct list_head rx_queue;
+        /* Pool of rx_packet structures that are not currently used. */
+        struct list_head rx_pool;
+        int rx_pool_size;
+        /* True if reception of data is blocked while userspace processes it. */
+        int blocking_rx;
+        /* True if there is RX data ready on the hardware. */
+        int rx_ready;
+        unsigned short last_memtx_serial;
+        /*
+         * Newer versions of the V2 card firmware send serial numbers in the
+         * MemTX register. 'serial_number_detected' is set true when we detect
+         * a non-zero serial number (indicating the new firmware).  Thereafter,
+         * the driver can safely ignore the Timer Recovery re-sends to avoid
+         * out-of-sync problems.
+         */
+        int serial_number_detected;
+        struct work_struct work_rx;
+
+        /* True if we are to send the set-up data to the hardware. */
+        int to_setup;
+
+        /* Card has been removed */
+        int removed;
+        /* Saved irq value when we disable the interrupt. */
+        int irq;
+        /* True if this driver is shutting down. */
+        int shutting_down;
+        /* Modem control lines */
+        unsigned int control_lines[NL_NUM_OF_ADDRESSES];
+        struct ipw_rx_packet *packet_assembler[NL_NUM_OF_ADDRESSES];
+
+        struct tasklet_struct tasklet;
+
+        /* The handle for the network layer, for the sending of events to it. */
+        struct ipw_network *network;
+        struct MEMINFREG __iomem *memory_info_regs;
+        struct MEMCCR __iomem *memregs_CCR;
+        void (*reboot_callback) (void *data);
+        void *reboot_callback_data;
+
+        unsigned short __iomem *memreg_tx;
+};
+
+/*
+ * Packet info structure for tx packets.
+ * Note: not all the fields defined here are required for all protocols
+ */
+struct ipw_tx_packet {
+        struct list_head queue;
+        /* channel idx + 1 */
+        unsigned char dest_addr;
+        /* SETUP, CTRL or DATA */
+        unsigned char protocol;
+        /* Length of data block, which starts at the end of this structure */
+        unsigned short length;
+        /* Sending state */
+        /* Offset of where we've sent up to so far */
+        unsigned long offset;
+        /* Count of packet fragments, starting at 0 */
+        int fragment_count;
+
+        /* Called after packet is sent and before is freed */
+        void (*packet_callback) (void *cb_data, unsigned int packet_length);
+        void *callback_data;
+};
+
+/* Signals from DTE */
+#define COMCTRL_RTS     0
+#define COMCTRL_DTR     1
+
+/* Signals from DCE */
+#define COMCTRL_CTS     2
+#define COMCTRL_DCD     3
+#define COMCTRL_DSR     4
+#define COMCTRL_RI      5
+
+struct ipw_control_packet_body {
+        /* DTE signal or DCE signal */
+        unsigned char sig_no;
+        /* 0: set signal, 1: clear signal */
+        unsigned char value;
+} __attribute__ ((__packed__));
+
+struct ipw_control_packet {
+        struct ipw_tx_packet header;
+        struct ipw_control_packet_body body;
+};
+
+struct ipw_rx_packet {
+        struct list_head queue;
+        unsigned int capacity;
+        unsigned int length;
+        unsigned int protocol;
+        unsigned int channel_idx;
+};
+
+static char *data_type(const unsigned char *buf, unsigned length)
+{
+        struct nl_packet_header *hdr = (struct nl_packet_header *) buf;
+
+        if (length == 0)
+                return "     ";
+
+        if (hdr->packet_rank & NL_FIRST_PACKET) {
+                switch (hdr->protocol) {
+                case TL_PROTOCOLID_COM_DATA:    return "DATA ";
+                case TL_PROTOCOLID_COM_CTRL:    return "CTRL ";
+                case TL_PROTOCOLID_SETUP:       return "SETUP";
+                default: return "???? ";
+                }
+        } else
+                return "     ";
+}
+
+#define DUMP_MAX_BYTES 64
+
+static void dump_data_bytes(const char *type, const unsigned char *data,
+                            unsigned length)
+{
+        char prefix[56];
+
+        sprintf(prefix, IPWIRELESS_PCCARD_NAME ": %s %s ",
+                        type, data_type(data, length));
+        print_hex_dump_bytes(prefix, 0, (void *)data,
+                        length < DUMP_MAX_BYTES ? length : DUMP_MAX_BYTES);
+}
+
+static void swap_packet_bitfield_to_le(unsigned char *data)
+{
+#ifdef __BIG_ENDIAN_BITFIELD
+        unsigned char tmp = *data, ret = 0;
+
+        /*
+         * transform bits from aa.bbb.ccc to ccc.bbb.aa
+         */
+        ret |= tmp & 0xc0 >> 6;
+        ret |= tmp & 0x38 >> 1;
+        ret |= tmp & 0x07 << 5;
+        *data = ret & 0xff;
+#endif
+}
+
+static void swap_packet_bitfield_from_le(unsigned char *data)
+{
+#ifdef __BIG_ENDIAN_BITFIELD
+        unsigned char tmp = *data, ret = 0;
+
+        /*
+         * transform bits from ccc.bbb.aa to aa.bbb.ccc
+         */
+        ret |= tmp & 0xe0 >> 5;
+        ret |= tmp & 0x1c << 1;
+        ret |= tmp & 0x03 << 6;
+        *data = ret & 0xff;
+#endif
+}
+
+static void do_send_fragment(struct ipw_hardware *hw, unsigned char *data,
+                            unsigned length)
+{
+        unsigned i;
+        unsigned long flags;
+
+        start_timing();
+        BUG_ON(length > hw->ll_mtu);
+
+        if (ipwireless_debug)
+                dump_data_bytes("send", data, length);
+
+        spin_lock_irqsave(&hw->lock, flags);
+
+        hw->tx_ready = 0;
+        swap_packet_bitfield_to_le(data);
+
+        if (hw->hw_version == HW_VERSION_1) {
+                outw((unsigned short) length, hw->base_port + IODWR);
+
+                for (i = 0; i < length; i += 2) {
+                        unsigned short d = data[i];
+                        __le16 raw_data;
+
+                        if (i + 1 < length)
+                                d |= data[i + 1] << 8;
+                        raw_data = cpu_to_le16(d);
+                        outw(raw_data, hw->base_port + IODWR);
+                }
+
+                outw(DCR_TXDONE, hw->base_port + IODCR);
+        } else if (hw->hw_version == HW_VERSION_2) {
+                outw((unsigned short) length, hw->base_port);
+
+                for (i = 0; i < length; i += 2) {
+                        unsigned short d = data[i];
+                        __le16 raw_data;
+
+                        if (i + 1 < length)
+                                d |= data[i + 1] << 8;
+                        raw_data = cpu_to_le16(d);
+                        outw(raw_data, hw->base_port);
+                }
+                while ((i & 3) != 2) {
+                        outw((unsigned short) 0xDEAD, hw->base_port);
+                        i += 2;
+                }
+                writew(MEMRX_RX, &hw->memory_info_regs->memreg_rx);
+        }
+
+        spin_unlock_irqrestore(&hw->lock, flags);
+
+        end_write_timing(length);
+}
+
+static void do_send_packet(struct ipw_hardware *hw, struct ipw_tx_packet *packet)
+{
+        unsigned short fragment_data_len;
+        unsigned short data_left = packet->length - packet->offset;
+        unsigned short header_size;
+        union nl_packet pkt;
+
+        header_size =
+            (packet->fragment_count == 0)
+            ? NL_FIRST_PACKET_HEADER_SIZE
+            : NL_FOLLOWING_PACKET_HEADER_SIZE;
+        fragment_data_len = hw->ll_mtu - header_size;
+        if (data_left < fragment_data_len)
+                fragment_data_len = data_left;
+
+        /*
+         * hdr_first is now in machine bitfield order, which will be swapped
+         * to le just before it goes to hw
+         */
+        pkt.hdr_first.protocol = packet->protocol;
+        pkt.hdr_first.address = packet->dest_addr;
+        pkt.hdr_first.packet_rank = 0;
+
+        /* First packet? */
+        if (packet->fragment_count == 0) {
+                pkt.hdr_first.packet_rank |= NL_FIRST_PACKET;
+                pkt.hdr_first.length_lsb = (unsigned char) packet->length;
+                pkt.hdr_first.length_msb =
+                        (unsigned char) (packet->length >> 8);
+        }
+
+        memcpy(pkt.rawpkt + header_size,
+               ((unsigned char *) packet) + sizeof(struct ipw_tx_packet) +
+               packet->offset, fragment_data_len);
+        packet->offset += fragment_data_len;
+        packet->fragment_count++;
+
+        /* Last packet? (May also be first packet.) */
+        if (packet->offset == packet->length)
+                pkt.hdr_first.packet_rank |= NL_LAST_PACKET;
+        do_send_fragment(hw, pkt.rawpkt, header_size + fragment_data_len);
+
+        /* If this packet has unsent data, then re-queue it. */
+        if (packet->offset < packet->length) {
+                /*
+                 * Re-queue it at the head of the highest priority queue so
+                 * it goes before all other packets
+                 */
+                unsigned long flags;
+
+                spin_lock_irqsave(&hw->lock, flags);
+                list_add(&packet->queue, &hw->tx_queue[0]);
+                hw->tx_queued++;
+                spin_unlock_irqrestore(&hw->lock, flags);
+        } else {
+                if (packet->packet_callback)
+                        packet->packet_callback(packet->callback_data,
+                                        packet->length);
+                kfree(packet);
+        }
+}
+
+static void ipw_setup_hardware(struct ipw_hardware *hw)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&hw->lock, flags);
+        if (hw->hw_version == HW_VERSION_1) {
+                /* Reset RX FIFO */
+                outw(DCR_RXRESET, hw->base_port + IODCR);
+                /* SB: Reset TX FIFO */
+                outw(DCR_TXRESET, hw->base_port + IODCR);
+
+                /* Enable TX and RX interrupts. */
+                outw(IER_TXENABLED | IER_RXENABLED, hw->base_port + IOIER);
+        } else {
+                /*
+                 * Set INTRACK bit (bit 0), which means we must explicitly
+                 * acknowledge interrupts by clearing bit 2 of reg_config_and_status.
+                 */
+                unsigned short csr = readw(&hw->memregs_CCR->reg_config_and_status);
+
+                csr |= 1;
+                writew(csr, &hw->memregs_CCR->reg_config_and_status);
+        }
+        spin_unlock_irqrestore(&hw->lock, flags);
+}
+
+/*
+ * If 'packet' is NULL, then this function allocates a new packet, setting its
+ * length to 0 and ensuring it has the specified minimum amount of free space.
+ *
+ * If 'packet' is not NULL, then this function enlarges it if it doesn't
+ * have the specified minimum amount of free space.
+ *
+ */
+static struct ipw_rx_packet *pool_allocate(struct ipw_hardware *hw,
+                                           struct ipw_rx_packet *packet,
+                                           int minimum_free_space)
+{
+
+        if (!packet) {
+                unsigned long flags;
+
+                spin_lock_irqsave(&hw->lock, flags);
+                if (!list_empty(&hw->rx_pool)) {
+                        packet = list_first_entry(&hw->rx_pool,
+                                        struct ipw_rx_packet, queue);
+                        hw->rx_pool_size--;
+                        spin_unlock_irqrestore(&hw->lock, flags);
+                        list_del(&packet->queue);
+                } else {
+                        const int min_capacity =
+                                ipwireless_ppp_mru(hw->network) + 2;
+                        int new_capacity;
+
+                        spin_unlock_irqrestore(&hw->lock, flags);
+                        new_capacity =
+                                (minimum_free_space > min_capacity
+                                 ? minimum_free_space
+                                 : min_capacity);
+                        packet = kmalloc(sizeof(struct ipw_rx_packet)
+                                        + new_capacity, GFP_ATOMIC);
+                        if (!packet)
+                                return NULL;
+                        packet->capacity = new_capacity;
+                }
+                packet->length = 0;
+        }
+
+        if (packet->length + minimum_free_space > packet->capacity) {
+                struct ipw_rx_packet *old_packet = packet;
+
+                packet = kmalloc(sizeof(struct ipw_rx_packet) +
+                                old_packet->length + minimum_free_space,
+                                GFP_ATOMIC);
+                if (!packet) {
+                        kfree(old_packet);
+                        return NULL;
+                }
+                memcpy(packet, old_packet,
+                                sizeof(struct ipw_rx_packet)
+                                        + old_packet->length);
+                packet->capacity = old_packet->length + minimum_free_space;
+                kfree(old_packet);
+        }
+
+        return packet;
+}
+
+static void pool_free(struct ipw_hardware *hw, struct ipw_rx_packet *packet)
+{
+        if (hw->rx_pool_size > 6)
+                kfree(packet);
+        else {
+                hw->rx_pool_size++;
+                list_add(&packet->queue, &hw->rx_pool);
+        }
+}
+
+static void queue_received_packet(struct ipw_hardware *hw,
+                                  unsigned int protocol,
+                                  unsigned int address,
+                                  const unsigned char *data, int length,
+                                  int is_last)
+{
+        unsigned int channel_idx = address - 1;
+        struct ipw_rx_packet *packet = NULL;
+        unsigned long flags;
+
+        /* Discard packet if channel index is out of range. */
+        if (channel_idx >= NL_NUM_OF_ADDRESSES) {
+                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                       ": data packet has bad address %u\n", address);
+                return;
+        }
+
+        /*
+         * ->packet_assembler is safe to touch unlocked, this is the only place
+         */
+        if (protocol == TL_PROTOCOLID_COM_DATA) {
+                struct ipw_rx_packet **assem =
+                        &hw->packet_assembler[channel_idx];
+
+                /*
+                 * Create a new packet, or assembler already contains one
+                 * enlarge it by 'length' bytes.
+                 */
+                (*assem) = pool_allocate(hw, *assem, length);
+                if (!(*assem)) {
+                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                                ": no memory for incomming data packet, dropped!\n");
+                        return;
+                }
+                (*assem)->protocol = protocol;
+                (*assem)->channel_idx = channel_idx;
+
+                /* Append this packet data onto existing data. */
+                memcpy((unsigned char *)(*assem) +
+                               sizeof(struct ipw_rx_packet)
+                                + (*assem)->length, data, length);
+                (*assem)->length += length;
+                if (is_last) {
+                        packet = *assem;
+                        *assem = NULL;
+                        /* Count queued DATA bytes only */
+                        spin_lock_irqsave(&hw->lock, flags);
+                        hw->rx_bytes_queued += packet->length;
+                        spin_unlock_irqrestore(&hw->lock, flags);
+                }
+        } else {
+                /* If it's a CTRL packet, don't assemble, just queue it. */
+                packet = pool_allocate(hw, NULL, length);
+                if (!packet) {
+                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                                ": no memory for incomming ctrl packet, dropped!\n");
+                        return;
+                }
+                packet->protocol = protocol;
+                packet->channel_idx = channel_idx;
+                memcpy((unsigned char *)packet + sizeof(struct ipw_rx_packet),
+                                data, length);
+                packet->length = length;
+        }
+
+        /*
+         * If this is the last packet, then send the assembled packet on to the
+         * network layer.
+         */
+        if (packet) {
+                spin_lock_irqsave(&hw->lock, flags);
+                list_add_tail(&packet->queue, &hw->rx_queue);
+                /* Block reception of incoming packets if queue is full. */
+                hw->blocking_rx =
+                        (hw->rx_bytes_queued >= IPWIRELESS_RX_QUEUE_SIZE);
+
+                spin_unlock_irqrestore(&hw->lock, flags);
+                schedule_work(&hw->work_rx);
+        }
+}
+
+/*
+ * Workqueue callback
+ */
+static void ipw_receive_data_work(struct work_struct *work_rx)
+{
+        struct ipw_hardware *hw =
+            container_of(work_rx, struct ipw_hardware, work_rx);
+        unsigned long flags;
+
+        spin_lock_irqsave(&hw->lock, flags);
+        while (!list_empty(&hw->rx_queue)) {
+                struct ipw_rx_packet *packet =
+                        list_first_entry(&hw->rx_queue,
+                                        struct ipw_rx_packet, queue);
+
+                if (hw->shutting_down)
+                        break;
+                list_del(&packet->queue);
+
+                /*
+                 * Note: ipwireless_network_packet_received must be called in a
+                 * process context (i.e. via schedule_work) because the tty
+                 * output code can sleep in the tty_flip_buffer_push call.
+                 */
+                if (packet->protocol == TL_PROTOCOLID_COM_DATA) {
+                        if (hw->network != NULL) {
+                                /* If the network hasn't been disconnected. */
+                                spin_unlock_irqrestore(&hw->lock, flags);
+                                /*
+                                 * This must run unlocked due to tty processing
+                                 * and mutex locking
+                                 */
+                                ipwireless_network_packet_received(
+                                                hw->network,
+                                                packet->channel_idx,
+                                                (unsigned char *)packet
+                                                + sizeof(struct ipw_rx_packet),
+                                                packet->length);
+                                spin_lock_irqsave(&hw->lock, flags);
+                        }
+                        /* Count queued DATA bytes only */
+                        hw->rx_bytes_queued -= packet->length;
+                } else {
+                        /*
+                         * This is safe to be called locked, callchain does
+                         * not block
+                         */
+                        handle_received_CTRL_packet(hw, packet->channel_idx,
+                                        (unsigned char *)packet
+                                        + sizeof(struct ipw_rx_packet),
+                                        packet->length);
+                }
+                pool_free(hw, packet);
+                /*
+                 * Unblock reception of incoming packets if queue is no longer
+                 * full.
+                 */
+                hw->blocking_rx =
+                        hw->rx_bytes_queued >= IPWIRELESS_RX_QUEUE_SIZE;
+                if (hw->shutting_down)
+                        break;
+        }
+        spin_unlock_irqrestore(&hw->lock, flags);
+}
+
+static void handle_received_CTRL_packet(struct ipw_hardware *hw,
+                                        unsigned int channel_idx,
+                                        const unsigned char *data, int len)
+{
+        const struct ipw_control_packet_body *body =
+                (const struct ipw_control_packet_body *) data;
+        unsigned int changed_mask;
+
+        if (len != sizeof(struct ipw_control_packet_body)) {
+                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                       ": control packet was %d bytes - wrong size!\n",
+                       len);
+                return;
+        }
+
+        switch (body->sig_no) {
+        case COMCTRL_CTS:
+                changed_mask = IPW_CONTROL_LINE_CTS;
+                break;
+        case COMCTRL_DCD:
+                changed_mask = IPW_CONTROL_LINE_DCD;
+                break;
+        case COMCTRL_DSR:
+                changed_mask = IPW_CONTROL_LINE_DSR;
+                break;
+        case COMCTRL_RI:
+                changed_mask = IPW_CONTROL_LINE_RI;
+                break;
+        default:
+                changed_mask = 0;
+        }
+
+        if (changed_mask != 0) {
+                if (body->value)
+                        hw->control_lines[channel_idx] |= changed_mask;
+                else
+                        hw->control_lines[channel_idx] &= ~changed_mask;
+                if (hw->network)
+                        ipwireless_network_notify_control_line_change(
+                                        hw->network,
+                                        channel_idx,
+                                        hw->control_lines[channel_idx],
+                                        changed_mask);
+        }
+}
+
+static void handle_received_packet(struct ipw_hardware *hw,
+                                   const union nl_packet *packet,
+                                   unsigned short len)
+{
+        unsigned int protocol = packet->hdr.protocol;
+        unsigned int address = packet->hdr.address;
+        unsigned int header_length;
+        const unsigned char *data;
+        unsigned int data_len;
+        int is_last = packet->hdr.packet_rank & NL_LAST_PACKET;
+
+        if (packet->hdr.packet_rank & NL_FIRST_PACKET)
+                header_length = NL_FIRST_PACKET_HEADER_SIZE;
+        else
+                header_length = NL_FOLLOWING_PACKET_HEADER_SIZE;
+
+        data = packet->rawpkt + header_length;
+        data_len = len - header_length;
+        switch (protocol) {
+        case TL_PROTOCOLID_COM_DATA:
+        case TL_PROTOCOLID_COM_CTRL:
+                queue_received_packet(hw, protocol, address, data, data_len,
+                                is_last);
+                break;
+        case TL_PROTOCOLID_SETUP:
+                handle_received_SETUP_packet(hw, address, data, data_len,
+                                is_last);
+                break;
+        }
+}
+
+static void acknowledge_data_read(struct ipw_hardware *hw)
+{
+        if (hw->hw_version == HW_VERSION_1)
+                outw(DCR_RXDONE, hw->base_port + IODCR);
+        else
+                writew(MEMRX_PCINTACKK,
+                                &hw->memory_info_regs->memreg_pc_interrupt_ack);
+}
+
+/*
+ * Retrieve a packet from the IPW hardware.
+ */
+static void do_receive_packet(struct ipw_hardware *hw)
+{
+        unsigned len;
+        unsigned i;
+        unsigned char pkt[LL_MTU_MAX];
+
+        start_timing();
+
+        if (hw->hw_version == HW_VERSION_1) {
+                len = inw(hw->base_port + IODRR);
+                if (len > hw->ll_mtu) {
+                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                               ": received a packet of %u bytes - longer than the MTU!\n", len);
+                        outw(DCR_RXDONE | DCR_RXRESET, hw->base_port + IODCR);
+                        return;
+                }
+
+                for (i = 0; i < len; i += 2) {
+                        __le16 raw_data = inw(hw->base_port + IODRR);
+                        unsigned short data = le16_to_cpu(raw_data);
+
+                        pkt[i] = (unsigned char) data;
+                        pkt[i + 1] = (unsigned char) (data >> 8);
+                }
+        } else {
+                len = inw(hw->base_port);
+                if (len > hw->ll_mtu) {
+                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                               ": received a packet of %u bytes - longer than the MTU!\n", len);
+                        writew(MEMRX_PCINTACKK,
+                                &hw->memory_info_regs->memreg_pc_interrupt_ack);
+                        return;
+                }
+
+                for (i = 0; i < len; i += 2) {
+                        __le16 raw_data = inw(hw->base_port);
+                        unsigned short data = le16_to_cpu(raw_data);
+
+                        pkt[i] = (unsigned char) data;
+                        pkt[i + 1] = (unsigned char) (data >> 8);
+                }
+
+                while ((i & 3) != 2) {
+                        inw(hw->base_port);
+                        i += 2;
+                }
+        }
+
+        acknowledge_data_read(hw);
+
+        swap_packet_bitfield_from_le(pkt);
+
+        if (ipwireless_debug)
+                dump_data_bytes("recv", pkt, len);
+
+        handle_received_packet(hw, (union nl_packet *) pkt, len);
+
+        end_read_timing(len);
+}
+
+static int get_current_packet_priority(struct ipw_hardware *hw)
+{
+        /*
+         * If we're initializing, don't send anything of higher priority than
+         * PRIO_SETUP.  The network layer therefore need not care about
+         * hardware initialization - any of its stuff will simply be queued
+         * until setup is complete.
+         */
+        return (hw->to_setup || hw->initializing
+                        ? PRIO_SETUP + 1 : NL_NUM_OF_PRIORITIES);
+}
+
+/*
+ * return 1 if something has been received from hw
+ */
+static int get_packets_from_hw(struct ipw_hardware *hw)
+{
+        int received = 0;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hw->lock, flags);
+        while (hw->rx_ready && !hw->blocking_rx) {
+                received = 1;
+                hw->rx_ready--;
+                spin_unlock_irqrestore(&hw->lock, flags);
+
+                do_receive_packet(hw);
+
+                spin_lock_irqsave(&hw->lock, flags);
+        }
+        spin_unlock_irqrestore(&hw->lock, flags);
+
+        return received;
+}
+
+/*
+ * Send pending packet up to given priority, prioritize SETUP data until
+ * hardware is fully setup.
+ *
+ * return 1 if more packets can be sent
+ */
+static int send_pending_packet(struct ipw_hardware *hw, int priority_limit)
+{
+        int more_to_send = 0;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hw->lock, flags);
+        if (hw->tx_queued && hw->tx_ready) {
+                int priority;
+                struct ipw_tx_packet *packet = NULL;
+
+                /* Pick a packet */
+                for (priority = 0; priority < priority_limit; priority++) {
+                        if (!list_empty(&hw->tx_queue[priority])) {
+                                packet = list_first_entry(
+                                                &hw->tx_queue[priority],
+                                                struct ipw_tx_packet,
+                                                queue);
+
+                                hw->tx_queued--;
+                                list_del(&packet->queue);
+
+                                break;
+                        }
+                }
+                if (!packet) {
+                        hw->tx_queued = 0;
+                        spin_unlock_irqrestore(&hw->lock, flags);
+                        return 0;
+                }
+
+                spin_unlock_irqrestore(&hw->lock, flags);
+
+                /* Send */
+                do_send_packet(hw, packet);
+
+                /* Check if more to send */
+                spin_lock_irqsave(&hw->lock, flags);
+                for (priority = 0; priority < priority_limit; priority++)
+                        if (!list_empty(&hw->tx_queue[priority])) {
+                                more_to_send = 1;
+                                break;
+                        }
+
+                if (!more_to_send)
+                        hw->tx_queued = 0;
+        }
+        spin_unlock_irqrestore(&hw->lock, flags);
+
+        return more_to_send;
+}
+
+/*
+ * Send and receive all queued packets.
+ */
+static void ipwireless_do_tasklet(unsigned long hw_)
+{
+        struct ipw_hardware *hw = (struct ipw_hardware *) hw_;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hw->lock, flags);
+        if (hw->shutting_down) {
+                spin_unlock_irqrestore(&hw->lock, flags);
+                return;
+        }
+
+        if (hw->to_setup == 1) {
+                /*
+                 * Initial setup data sent to hardware
+                 */
+                hw->to_setup = 2;
+                spin_unlock_irqrestore(&hw->lock, flags);
+
+                ipw_setup_hardware(hw);
+                ipw_send_setup_packet(hw);
+
+                send_pending_packet(hw, PRIO_SETUP + 1);
+                get_packets_from_hw(hw);
+        } else {
+                int priority_limit = get_current_packet_priority(hw);
+                int again;
+
+                spin_unlock_irqrestore(&hw->lock, flags);
+
+                do {
+                        again = send_pending_packet(hw, priority_limit);
+                        again |= get_packets_from_hw(hw);
+                } while (again);
+        }
+}
+
+/*
+ * return true if the card is physically present.
+ */
+static int is_card_present(struct ipw_hardware *hw)
+{
+        if (hw->hw_version == HW_VERSION_1)
+                return inw(hw->base_port + IOIR) != 0xFFFF;
+        else
+                return readl(&hw->memory_info_regs->memreg_card_present) ==
+                    CARD_PRESENT_VALUE;
+}
+
+static irqreturn_t ipwireless_handle_v1_interrupt(int irq,
+                                                  struct ipw_hardware *hw)
+{
+        unsigned short irqn;
+
+        irqn = inw(hw->base_port + IOIR);
+
+        /* Check if card is present */
+        if (irqn == 0xFFFF)
+                return IRQ_NONE;
+        else if (irqn != 0) {
+                unsigned short ack = 0;
+                unsigned long flags;
+
+                /* Transmit complete. */
+                if (irqn & IR_TXINTR) {
+                        ack |= IR_TXINTR;
+                        spin_lock_irqsave(&hw->lock, flags);
+                        hw->tx_ready = 1;
+                        spin_unlock_irqrestore(&hw->lock, flags);
+                }
+                /* Received data */
+                if (irqn & IR_RXINTR) {
+                        ack |= IR_RXINTR;
+                        spin_lock_irqsave(&hw->lock, flags);
+                        hw->rx_ready++;
+                        spin_unlock_irqrestore(&hw->lock, flags);
+                }
+                if (ack != 0) {
+                        outw(ack, hw->base_port + IOIR);
+                        tasklet_schedule(&hw->tasklet);
+                }
+                return IRQ_HANDLED;
+        }
+        return IRQ_NONE;
+}
+
+static void acknowledge_pcmcia_interrupt(struct ipw_hardware *hw)
+{
+        unsigned short csr = readw(&hw->memregs_CCR->reg_config_and_status);
+
+        csr &= 0xfffd;
+        writew(csr, &hw->memregs_CCR->reg_config_and_status);
+}
+
+static irqreturn_t ipwireless_handle_v2_v3_interrupt(int irq,
+                                                     struct ipw_hardware *hw)
+{
+        int tx = 0;
+        int rx = 0;
+        int rx_repeat = 0;
+        int try_mem_tx_old;
+        unsigned long flags;
+
+        do {
+
+        unsigned short memtx = readw(hw->memreg_tx);
+        unsigned short memtx_serial;
+        unsigned short memrxdone =
+                readw(&hw->memory_info_regs->memreg_rx_done);
+
+        try_mem_tx_old = 0;
+
+        /* check whether the interrupt was generated by ipwireless card */
+        if (!(memtx & MEMTX_TX) && !(memrxdone & MEMRX_RX_DONE)) {
+
+                /* check if the card uses memreg_tx_old register */
+                if (hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
+                        memtx = readw(&hw->memory_info_regs->memreg_tx_old);
+                        if (memtx & MEMTX_TX) {
+                                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                                        ": Using memreg_tx_old\n");
+                                hw->memreg_tx =
+                                        &hw->memory_info_regs->memreg_tx_old;
+                        } else {
+                                return IRQ_NONE;
+                        }
+                } else
+                        return IRQ_NONE;
+        }
+
+        /*
+         * See if the card is physically present. Note that while it is
+         * powering up, it appears not to be present.
+         */
+        if (!is_card_present(hw)) {
+                acknowledge_pcmcia_interrupt(hw);
+                return IRQ_HANDLED;
+        }
+
+        memtx_serial = memtx & (unsigned short) 0xff00;
+        if (memtx & MEMTX_TX) {
+                writew(memtx_serial, hw->memreg_tx);
+
+                if (hw->serial_number_detected) {
+                        if (memtx_serial != hw->last_memtx_serial) {
+                                hw->last_memtx_serial = memtx_serial;
+                                spin_lock_irqsave(&hw->lock, flags);
+                                hw->rx_ready++;
+                                spin_unlock_irqrestore(&hw->lock, flags);
+                                rx = 1;
+                        } else
+                                /* Ignore 'Timer Recovery' duplicates. */
+                                rx_repeat = 1;
+                } else {
+                        /*
+                         * If a non-zero serial number is seen, then enable
+                         * serial number checking.
+                         */
+                        if (memtx_serial != 0) {
+                                hw->serial_number_detected = 1;
+                                printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
+                                        ": memreg_tx serial num detected\n");
+
+                                spin_lock_irqsave(&hw->lock, flags);
+                                hw->rx_ready++;
+                                spin_unlock_irqrestore(&hw->lock, flags);
+                        }
+                        rx = 1;
+                }
+        }
+        if (memrxdone & MEMRX_RX_DONE) {
+                writew(0, &hw->memory_info_regs->memreg_rx_done);
+                spin_lock_irqsave(&hw->lock, flags);
+                hw->tx_ready = 1;
+                spin_unlock_irqrestore(&hw->lock, flags);
+                tx = 1;
+        }
+        if (tx)
+                writew(MEMRX_PCINTACKK,
+                                &hw->memory_info_regs->memreg_pc_interrupt_ack);
+
+        acknowledge_pcmcia_interrupt(hw);
+
+        if (tx || rx)
+                tasklet_schedule(&hw->tasklet);
+        else if (!rx_repeat) {
+                if (hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
+                        if (hw->serial_number_detected)
+                                printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
+                                        ": spurious interrupt - new_tx mode\n");
+                        else {
+                                printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
+                                        ": no valid memreg_tx value - switching to the old memreg_tx\n");
+                                hw->memreg_tx =
+                                        &hw->memory_info_regs->memreg_tx_old;
+                                try_mem_tx_old = 1;
+                        }
+                } else
+                        printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
+                                        ": spurious interrupt - old_tx mode\n");
+        }
+
+        } while (try_mem_tx_old == 1);
+
+        return IRQ_HANDLED;
+}
+
+irqreturn_t ipwireless_interrupt(int irq, void *dev_id)
+{
+        struct ipw_dev *ipw = dev_id;
+
+        if (ipw->hardware->hw_version == HW_VERSION_1)
+                return ipwireless_handle_v1_interrupt(irq, ipw->hardware);
+        else
+                return ipwireless_handle_v2_v3_interrupt(irq, ipw->hardware);
+}
+
+static void flush_packets_to_hw(struct ipw_hardware *hw)
+{
+        int priority_limit;
+        unsigned long flags;
+
+        spin_lock_irqsave(&hw->lock, flags);
+        priority_limit = get_current_packet_priority(hw);
+        spin_unlock_irqrestore(&hw->lock, flags);
+
+        while (send_pending_packet(hw, priority_limit));
+}
+
+static void send_packet(struct ipw_hardware *hw, int priority,
+                        struct ipw_tx_packet *packet)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&hw->lock, flags);
+        list_add_tail(&packet->queue, &hw->tx_queue[priority]);
+        hw->tx_queued++;
+        spin_unlock_irqrestore(&hw->lock, flags);
+
+        flush_packets_to_hw(hw);
+}
+
+/* Create data packet, non-atomic allocation */
+static void *alloc_data_packet(int data_size,
+                                unsigned char dest_addr,
+                                unsigned char protocol)
+{
+        struct ipw_tx_packet *packet = kzalloc(
+                        sizeof(struct ipw_tx_packet) + data_size,
+                        GFP_ATOMIC);
+
+        if (!packet)
+                return NULL;
+
+        INIT_LIST_HEAD(&packet->queue);
+        packet->dest_addr = dest_addr;
+        packet->protocol = protocol;
+        packet->length = data_size;
+
+        return packet;
+}
+
+static void *alloc_ctrl_packet(int header_size,
+                               unsigned char dest_addr,
+                               unsigned char protocol,
+                               unsigned char sig_no)
+{
+        /*
+         * sig_no is located right after ipw_tx_packet struct in every
+         * CTRL or SETUP packets, we can use ipw_control_packet as a
+         * common struct
+         */
+        struct ipw_control_packet *packet = kzalloc(header_size, GFP_ATOMIC);
+
+        if (!packet)
+                return NULL;
+
+        INIT_LIST_HEAD(&packet->header.queue);
+        packet->header.dest_addr = dest_addr;
+        packet->header.protocol = protocol;
+        packet->header.length = header_size - sizeof(struct ipw_tx_packet);
+        packet->body.sig_no = sig_no;
+
+        return packet;
+}
+
+int ipwireless_send_packet(struct ipw_hardware *hw, unsigned int channel_idx,
+                            const unsigned char *data, unsigned int length,
+                            void (*callback) (void *cb, unsigned int length),
+                            void *callback_data)
+{
+        struct ipw_tx_packet *packet;
+
+        packet = alloc_data_packet(length, (channel_idx + 1),
+                        TL_PROTOCOLID_COM_DATA);
+        if (!packet)
+                return -ENOMEM;
+        packet->packet_callback = callback;
+        packet->callback_data = callback_data;
+        memcpy((unsigned char *) packet + sizeof(struct ipw_tx_packet), data,
+                        length);
+
+        send_packet(hw, PRIO_DATA, packet);
+        return 0;
+}
+
+static int set_control_line(struct ipw_hardware *hw, int prio,
+                           unsigned int channel_idx, int line, int state)
+{
+        struct ipw_control_packet *packet;
+        int protocolid = TL_PROTOCOLID_COM_CTRL;
+
+        if (prio == PRIO_SETUP)
+                protocolid = TL_PROTOCOLID_SETUP;
+
+        packet = alloc_ctrl_packet(sizeof(struct ipw_control_packet),
+                        (channel_idx + 1), protocolid, line);
+        if (!packet)
+                return -ENOMEM;
+        packet->header.length = sizeof(struct ipw_control_packet_body);
+        packet->body.value = (state == 0 ? 0 : 1);
+        send_packet(hw, prio, &packet->header);
+        return 0;
+}
+
+
+static int set_DTR(struct ipw_hardware *hw, int priority,
+                   unsigned int channel_idx, int state)
+{
+        if (state != 0)
+                hw->control_lines[channel_idx] |= IPW_CONTROL_LINE_DTR;
+        else
+                hw->control_lines[channel_idx] &= ~IPW_CONTROL_LINE_DTR;
+
+        return set_control_line(hw, priority, channel_idx, COMCTRL_DTR, state);
+}
+
+static int set_RTS(struct ipw_hardware *hw, int priority,
+                   unsigned int channel_idx, int state)
+{
+        if (state != 0)
+                hw->control_lines[channel_idx] |= IPW_CONTROL_LINE_RTS;
+        else
+                hw->control_lines[channel_idx] &= ~IPW_CONTROL_LINE_RTS;
+
+        return set_control_line(hw, priority, channel_idx, COMCTRL_RTS, state);
+}
+
+int ipwireless_set_DTR(struct ipw_hardware *hw, unsigned int channel_idx,
+                       int state)
+{
+        return set_DTR(hw, PRIO_CTRL, channel_idx, state);
+}
+
+int ipwireless_set_RTS(struct ipw_hardware *hw, unsigned int channel_idx,
+                       int state)
+{
+        return set_RTS(hw, PRIO_CTRL, channel_idx, state);
+}
+
+struct ipw_setup_get_version_query_packet {
+        struct ipw_tx_packet header;
+        struct tl_setup_get_version_qry body;
+};
+
+struct ipw_setup_config_packet {
+        struct ipw_tx_packet header;
+        struct tl_setup_config_msg body;
+};
+
+struct ipw_setup_config_done_packet {
+        struct ipw_tx_packet header;
+        struct tl_setup_config_done_msg body;
+};
+
+struct ipw_setup_open_packet {
+        struct ipw_tx_packet header;
+        struct tl_setup_open_msg body;
+};
+
+struct ipw_setup_info_packet {
+        struct ipw_tx_packet header;
+        struct tl_setup_info_msg body;
+};
+
+struct ipw_setup_reboot_msg_ack {
+        struct ipw_tx_packet header;
+        struct TlSetupRebootMsgAck body;
+};
+
+/* This handles the actual initialization of the card */
+static void __handle_setup_get_version_rsp(struct ipw_hardware *hw)
+{
+        struct ipw_setup_config_packet *config_packet;
+        struct ipw_setup_config_done_packet *config_done_packet;
+        struct ipw_setup_open_packet *open_packet;
+        struct ipw_setup_info_packet *info_packet;
+        int port;
+        unsigned int channel_idx;
+
+        /* generate config packet */
+        for (port = 1; port <= NL_NUM_OF_ADDRESSES; port++) {
+                config_packet = alloc_ctrl_packet(
+                                sizeof(struct ipw_setup_config_packet),
+                                ADDR_SETUP_PROT,
+                                TL_PROTOCOLID_SETUP,
+                                TL_SETUP_SIGNO_CONFIG_MSG);
+                if (!config_packet)
+                        goto exit_nomem;
+                config_packet->header.length = sizeof(struct tl_setup_config_msg);
+                config_packet->body.port_no = port;
+                config_packet->body.prio_data = PRIO_DATA;
+                config_packet->body.prio_ctrl = PRIO_CTRL;
+                send_packet(hw, PRIO_SETUP, &config_packet->header);
+        }
+        config_done_packet = alloc_ctrl_packet(
+                        sizeof(struct ipw_setup_config_done_packet),
+                        ADDR_SETUP_PROT,
+                        TL_PROTOCOLID_SETUP,
+                        TL_SETUP_SIGNO_CONFIG_DONE_MSG);
+        if (!config_done_packet)
+                goto exit_nomem;
+        config_done_packet->header.length = sizeof(struct tl_setup_config_done_msg);
+        send_packet(hw, PRIO_SETUP, &config_done_packet->header);
+
+        /* generate open packet */
+        for (port = 1; port <= NL_NUM_OF_ADDRESSES; port++) {
+                open_packet = alloc_ctrl_packet(
+                                sizeof(struct ipw_setup_open_packet),
+                                ADDR_SETUP_PROT,
+                                TL_PROTOCOLID_SETUP,
+                                TL_SETUP_SIGNO_OPEN_MSG);
+                if (!open_packet)
+                        goto exit_nomem;
+                open_packet->header.length = sizeof(struct tl_setup_open_msg);
+                open_packet->body.port_no = port;
+                send_packet(hw, PRIO_SETUP, &open_packet->header);
+        }
+        for (channel_idx = 0;
+                        channel_idx < NL_NUM_OF_ADDRESSES; channel_idx++) {
+                int ret;
+
+                ret = set_DTR(hw, PRIO_SETUP, channel_idx,
+                        (hw->control_lines[channel_idx] &
+                         IPW_CONTROL_LINE_DTR) != 0);
+                if (ret) {
+                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                                        ": error setting DTR (%d)\n", ret);
+                        return;
+                }
+
+                set_RTS(hw, PRIO_SETUP, channel_idx,
+                        (hw->control_lines [channel_idx] &
+                         IPW_CONTROL_LINE_RTS) != 0);
+                if (ret) {
+                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                                        ": error setting RTS (%d)\n", ret);
+                        return;
+                }
+        }
+        /*
+         * For NDIS we assume that we are using sync PPP frames, for COM async.
+         * This driver uses NDIS mode too. We don't bother with translation
+         * from async -> sync PPP.
+         */
+        info_packet = alloc_ctrl_packet(sizeof(struct ipw_setup_info_packet),
+                        ADDR_SETUP_PROT,
+                        TL_PROTOCOLID_SETUP,
+                        TL_SETUP_SIGNO_INFO_MSG);
+        if (!info_packet)
+                goto exit_nomem;
+        info_packet->header.length = sizeof(struct tl_setup_info_msg);
+        info_packet->body.driver_type = NDISWAN_DRIVER;
+        info_packet->body.major_version = NDISWAN_DRIVER_MAJOR_VERSION;
+        info_packet->body.minor_version = NDISWAN_DRIVER_MINOR_VERSION;
+        send_packet(hw, PRIO_SETUP, &info_packet->header);
+
+        /* Initialization is now complete, so we clear the 'to_setup' flag */
+        hw->to_setup = 0;
+
+        return;
+
+exit_nomem:
+        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                        ": not enough memory to alloc control packet\n");
+        hw->to_setup = -1;
+}
+
+static void handle_setup_get_version_rsp(struct ipw_hardware *hw,
+                unsigned char vers_no)
+{
+        del_timer(&hw->setup_timer);
+        hw->initializing = 0;
+        printk(KERN_INFO IPWIRELESS_PCCARD_NAME ": card is ready.\n");
+
+        if (vers_no == TL_SETUP_VERSION)
+                __handle_setup_get_version_rsp(hw);
+        else
+                printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                                ": invalid hardware version no %u\n",
+                                (unsigned int) vers_no);
+}
+
+static void ipw_send_setup_packet(struct ipw_hardware *hw)
+{
+        struct ipw_setup_get_version_query_packet *ver_packet;
+
+        ver_packet = alloc_ctrl_packet(
+                        sizeof(struct ipw_setup_get_version_query_packet),
+                        ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
+                        TL_SETUP_SIGNO_GET_VERSION_QRY);
+        ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);
+
+        /*
+         * Response is handled in handle_received_SETUP_packet
+         */
+        send_packet(hw, PRIO_SETUP, &ver_packet->header);
+}
+
+static void handle_received_SETUP_packet(struct ipw_hardware *hw,
+                                         unsigned int address,
+                                         const unsigned char *data, int len,
+                                         int is_last)
+{
+        const union ipw_setup_rx_msg *rx_msg = (const union ipw_setup_rx_msg *) data;
+
+        if (address != ADDR_SETUP_PROT) {
+                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                       ": setup packet has bad address %d\n", address);
+                return;
+        }
+
+        switch (rx_msg->sig_no) {
+        case TL_SETUP_SIGNO_GET_VERSION_RSP:
+                if (hw->to_setup)
+                        handle_setup_get_version_rsp(hw,
+                                        rx_msg->version_rsp_msg.version);
+                break;
+
+        case TL_SETUP_SIGNO_OPEN_MSG:
+                if (ipwireless_debug) {
+                        unsigned int channel_idx = rx_msg->open_msg.port_no - 1;
+
+                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                               ": OPEN_MSG [channel %u] reply received\n",
+                               channel_idx);
+                }
+                break;
+
+        case TL_SETUP_SIGNO_INFO_MSG_ACK:
+                if (ipwireless_debug)
+                        printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
+                               ": card successfully configured as NDISWAN\n");
+                break;
+
+        case TL_SETUP_SIGNO_REBOOT_MSG:
+                if (hw->to_setup)
+                        printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
+                               ": Setup not completed - ignoring reboot msg\n");
+                else {
+                        struct ipw_setup_reboot_msg_ack *packet;
+
+                        printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
+                               ": Acknowledging REBOOT message\n");
+                        packet = alloc_ctrl_packet(
+                                        sizeof(struct ipw_setup_reboot_msg_ack),
+                                        ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
+                                        TL_SETUP_SIGNO_REBOOT_MSG_ACK);
+                        packet->header.length =
+                                sizeof(struct TlSetupRebootMsgAck);
+                        send_packet(hw, PRIO_SETUP, &packet->header);
+                        if (hw->reboot_callback)
+                                hw->reboot_callback(hw->reboot_callback_data);
+                }
+                break;
+
+        default:
+                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                       ": unknown setup message %u received\n",
+                       (unsigned int) rx_msg->sig_no);
+        }
+}
+
+static void do_close_hardware(struct ipw_hardware *hw)
+{
+        unsigned int irqn;
+
+        if (hw->hw_version == HW_VERSION_1) {
+                /* Disable TX and RX interrupts. */
+                outw(0, hw->base_port + IOIER);
+
+                /* Acknowledge any outstanding interrupt requests */
+                irqn = inw(hw->base_port + IOIR);
+                if (irqn & IR_TXINTR)
+                        outw(IR_TXINTR, hw->base_port + IOIR);
+                if (irqn & IR_RXINTR)
+                        outw(IR_RXINTR, hw->base_port + IOIR);
+
+                synchronize_irq(hw->irq);
+        }
+}
+
+struct ipw_hardware *ipwireless_hardware_create(void)
+{
+        int i;
+        struct ipw_hardware *hw =
+                kzalloc(sizeof(struct ipw_hardware), GFP_KERNEL);
+
+        if (!hw)
+                return NULL;
+
+        hw->irq = -1;
+        hw->initializing = 1;
+        hw->tx_ready = 1;
+        hw->rx_bytes_queued = 0;
+        hw->rx_pool_size = 0;
+        hw->last_memtx_serial = (unsigned short) 0xffff;
+        for (i = 0; i < NL_NUM_OF_PRIORITIES; i++)
+                INIT_LIST_HEAD(&hw->tx_queue[i]);
+
+        INIT_LIST_HEAD(&hw->rx_queue);
+        INIT_LIST_HEAD(&hw->rx_pool);
+        spin_lock_init(&hw->lock);
+        tasklet_init(&hw->tasklet, ipwireless_do_tasklet, (unsigned long) hw);
+        INIT_WORK(&hw->work_rx, ipw_receive_data_work);
+        setup_timer(&hw->setup_timer, ipwireless_setup_timer,
+                        (unsigned long) hw);
+
+        return hw;
+}
+
+void ipwireless_init_hardware_v1(struct ipw_hardware *hw,
+                unsigned int base_port,
+                void __iomem *attr_memory,
+                void __iomem *common_memory,
+                int is_v2_card,
+                void (*reboot_callback) (void *data),
+                void *reboot_callback_data)
+{
+        if (hw->removed) {
+                hw->removed = 0;
+                enable_irq(hw->irq);
+        }
+        hw->base_port = base_port;
+        hw->hw_version = (is_v2_card ? HW_VERSION_2 : HW_VERSION_1);
+        hw->ll_mtu = (hw->hw_version == HW_VERSION_1 ? LL_MTU_V1 : LL_MTU_V2);
+        hw->memregs_CCR = (struct MEMCCR __iomem *)
+                        ((unsigned short __iomem *) attr_memory + 0x200);
+        hw->memory_info_regs = (struct MEMINFREG __iomem *) common_memory;
+        hw->memreg_tx = &hw->memory_info_regs->memreg_tx_new;
+        hw->reboot_callback = reboot_callback;
+        hw->reboot_callback_data = reboot_callback_data;
+}
+
+void ipwireless_init_hardware_v2_v3(struct ipw_hardware *hw)
+{
+        hw->initializing = 1;
+        hw->init_loops = 0;
+        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+               ": waiting for card to start up...\n");
+        ipwireless_setup_timer((unsigned long) hw);
+}
+
+static void ipwireless_setup_timer(unsigned long data)
+{
+        struct ipw_hardware *hw = (struct ipw_hardware *) data;
+
+        hw->init_loops++;
+
+        if (hw->init_loops == TL_SETUP_MAX_VERSION_QRY &&
+                        hw->hw_version == HW_VERSION_2 &&
+                        hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
+                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                                ": failed to startup using TX2, trying TX\n");
+
+                hw->memreg_tx = &hw->memory_info_regs->memreg_tx_old;
+                hw->init_loops = 0;
+        }
+        /* Give up after a certain number of retries */
+        if (hw->init_loops == TL_SETUP_MAX_VERSION_QRY) {
+                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                       ": card failed to start up!\n");
+                hw->initializing = 0;
+        } else {
+                /* Do not attempt to write to the board if it is not present. */
+                if (is_card_present(hw)) {
+                        unsigned long flags;
+
+                        spin_lock_irqsave(&hw->lock, flags);
+                        hw->to_setup = 1;
+                        hw->tx_ready = 1;
+                        spin_unlock_irqrestore(&hw->lock, flags);
+                        tasklet_schedule(&hw->tasklet);
+                }
+
+                mod_timer(&hw->setup_timer,
+                        jiffies + msecs_to_jiffies(TL_SETUP_VERSION_QRY_TMO));
+        }
+}
+
+/*
+ * Stop any interrupts from executing so that, once this function returns,
+ * other layers of the driver can be sure they won't get any more callbacks.
+ * Thus must be called on a proper process context.
+ */
+void ipwireless_stop_interrupts(struct ipw_hardware *hw)
+{
+        if (!hw->shutting_down) {
+                /* Tell everyone we are going down. */
+                hw->shutting_down = 1;
+                del_timer(&hw->setup_timer);
+
+                /* Prevent the hardware from sending any more interrupts */
+                do_close_hardware(hw);
+        }
+}
+
+void ipwireless_hardware_free(struct ipw_hardware *hw)
+{
+        int i;
+        struct ipw_rx_packet *rp, *rq;
+        struct ipw_tx_packet *tp, *tq;
+
+        ipwireless_stop_interrupts(hw);
+
+        flush_work_sync(&hw->work_rx);
+
+        for (i = 0; i < NL_NUM_OF_ADDRESSES; i++)
+                if (hw->packet_assembler[i] != NULL)
+                        kfree(hw->packet_assembler[i]);
+
+        for (i = 0; i < NL_NUM_OF_PRIORITIES; i++)
+                list_for_each_entry_safe(tp, tq, &hw->tx_queue[i], queue) {
+                        list_del(&tp->queue);
+                        kfree(tp);
+                }
+
+        list_for_each_entry_safe(rp, rq, &hw->rx_queue, queue) {
+                list_del(&rp->queue);
+                kfree(rp);
+        }
+
+        list_for_each_entry_safe(rp, rq, &hw->rx_pool, queue) {
+                list_del(&rp->queue);
+                kfree(rp);
+        }
+        kfree(hw);
+}
+
+/*
+ * Associate the specified network with this hardware, so it will receive events
+ * from it.
+ */
+void ipwireless_associate_network(struct ipw_hardware *hw,
+                                  struct ipw_network *network)
+{
+        hw->network = network;
+}
diff --git a/drivers/tty/ipwireless/hardware.h b/drivers/tty/ipwireless/hardware.h
new file mode 100644
index 000000000000..90a8590e43b0
--- /dev/null
+++ b/drivers/tty/ipwireless/hardware.h
@@ -0,0 +1,62 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#ifndef _IPWIRELESS_CS_HARDWARE_H_
+#define _IPWIRELESS_CS_HARDWARE_H_
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+
+#define IPW_CONTROL_LINE_CTS 0x0001
+#define IPW_CONTROL_LINE_DCD 0x0002
+#define IPW_CONTROL_LINE_DSR 0x0004
+#define IPW_CONTROL_LINE_RI  0x0008
+#define IPW_CONTROL_LINE_DTR 0x0010
+#define IPW_CONTROL_LINE_RTS 0x0020
+
+struct ipw_hardware;
+struct ipw_network;
+
+struct ipw_hardware *ipwireless_hardware_create(void);
+void ipwireless_hardware_free(struct ipw_hardware *hw);
+irqreturn_t ipwireless_interrupt(int irq, void *dev_id);
+int ipwireless_set_DTR(struct ipw_hardware *hw, unsigned int channel_idx,
+                int state);
+int ipwireless_set_RTS(struct ipw_hardware *hw, unsigned int channel_idx,
+                int state);
+int ipwireless_send_packet(struct ipw_hardware *hw,
+                            unsigned int channel_idx,
+                            const unsigned char *data,
+                            unsigned int length,
+                            void (*packet_sent_callback) (void *cb,
+                                                          unsigned int length),
+                            void *sent_cb_data);
+void ipwireless_associate_network(struct ipw_hardware *hw,
+                struct ipw_network *net);
+void ipwireless_stop_interrupts(struct ipw_hardware *hw);
+void ipwireless_init_hardware_v1(struct ipw_hardware *hw,
+                                 unsigned int base_port,
+                                 void __iomem *attr_memory,
+                                 void __iomem *common_memory,
+                                 int is_v2_card,
+                                 void (*reboot_cb) (void *data),
+                                 void *reboot_cb_data);
+void ipwireless_init_hardware_v2_v3(struct ipw_hardware *hw);
+void ipwireless_sleep(unsigned int tenths);
+
+#endif
diff --git a/drivers/tty/ipwireless/main.c b/drivers/tty/ipwireless/main.c
new file mode 100644
index 000000000000..655c7948261c
--- /dev/null
+++ b/drivers/tty/ipwireless/main.c
@@ -0,0 +1,347 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#include "hardware.h"
+#include "network.h"
+#include "main.h"
+#include "tty.h"
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include <pcmcia/cisreg.h>
+#include <pcmcia/device_id.h>
+#include <pcmcia/ss.h>
+#include <pcmcia/ds.h>
+
+static const struct pcmcia_device_id ipw_ids[] = {
+        PCMCIA_DEVICE_MANF_CARD(0x02f2, 0x0100),
+        PCMCIA_DEVICE_MANF_CARD(0x02f2, 0x0200),
+        PCMCIA_DEVICE_NULL
+};
+MODULE_DEVICE_TABLE(pcmcia, ipw_ids);
+
+static void ipwireless_detach(struct pcmcia_device *link);
+
+/*
+ * Module params
+ */
+/* Debug mode: more verbose, print sent/recv bytes */
+int ipwireless_debug;
+int ipwireless_loopback;
+int ipwireless_out_queue = 10;
+
+module_param_named(debug, ipwireless_debug, int, 0);
+module_param_named(loopback, ipwireless_loopback, int, 0);
+module_param_named(out_queue, ipwireless_out_queue, int, 0);
+MODULE_PARM_DESC(debug, "switch on debug messages [0]");
+MODULE_PARM_DESC(loopback,
+                "debug: enable ras_raw channel [0]");
+MODULE_PARM_DESC(out_queue, "debug: set size of outgoing PPP queue [10]");
+
+/* Executes in process context. */
+static void signalled_reboot_work(struct work_struct *work_reboot)
+{
+        struct ipw_dev *ipw = container_of(work_reboot, struct ipw_dev,
+                        work_reboot);
+        struct pcmcia_device *link = ipw->link;
+        pcmcia_reset_card(link->socket);
+}
+
+static void signalled_reboot_callback(void *callback_data)
+{
+        struct ipw_dev *ipw = (struct ipw_dev *) callback_data;
+
+        /* Delegate to process context. */
+        schedule_work(&ipw->work_reboot);
+}
+
+static int ipwireless_probe(struct pcmcia_device *p_dev, void *priv_data)
+{
+        struct ipw_dev *ipw = priv_data;
+        int ret;
+
+        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
+        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_AUTO;
+
+        /* 0x40 causes it to generate level mode interrupts. */
+        /* 0x04 enables IREQ pin. */
+        p_dev->config_index |= 0x44;
+        p_dev->io_lines = 16;
+        ret = pcmcia_request_io(p_dev);
+        if (ret)
+                return ret;
+
+        if (!request_region(p_dev->resource[0]->start,
+                            resource_size(p_dev->resource[0]),
+                            IPWIRELESS_PCCARD_NAME)) {
+                ret = -EBUSY;
+                goto exit;
+        }
+
+        p_dev->resource[2]->flags |=
+                WIN_DATA_WIDTH_16 | WIN_MEMORY_TYPE_CM | WIN_ENABLE;
+
+        ret = pcmcia_request_window(p_dev, p_dev->resource[2], 0);
+        if (ret != 0)
+                goto exit1;
+
+        ret = pcmcia_map_mem_page(p_dev, p_dev->resource[2], p_dev->card_addr);
+        if (ret != 0)
+                goto exit1;
+
+        ipw->is_v2_card = resource_size(p_dev->resource[2]) == 0x100;
+
+        ipw->common_memory = ioremap(p_dev->resource[2]->start,
+                                resource_size(p_dev->resource[2]));
+        if (!request_mem_region(p_dev->resource[2]->start,
+                                resource_size(p_dev->resource[2]),
+                                IPWIRELESS_PCCARD_NAME)) {
+                ret = -EBUSY;
+                goto exit2;
+        }
+
+        p_dev->resource[3]->flags |= WIN_DATA_WIDTH_16 | WIN_MEMORY_TYPE_AM |
+                                        WIN_ENABLE;
+        p_dev->resource[3]->end = 0; /* this used to be 0x1000 */
+        ret = pcmcia_request_window(p_dev, p_dev->resource[3], 0);
+        if (ret != 0)
+                goto exit3;
+
+        ret = pcmcia_map_mem_page(p_dev, p_dev->resource[3], 0);
+        if (ret != 0)
+                goto exit3;
+
+        ipw->attr_memory = ioremap(p_dev->resource[3]->start,
+                                resource_size(p_dev->resource[3]));
+        if (!request_mem_region(p_dev->resource[3]->start,
+                                resource_size(p_dev->resource[3]),
+                                IPWIRELESS_PCCARD_NAME)) {
+                ret = -EBUSY;
+                goto exit4;
+        }
+
+        return 0;
+
+exit4:
+        iounmap(ipw->attr_memory);
+exit3:
+        release_mem_region(p_dev->resource[2]->start,
+                        resource_size(p_dev->resource[2]));
+exit2:
+        iounmap(ipw->common_memory);
+exit1:
+        release_region(p_dev->resource[0]->start,
+                       resource_size(p_dev->resource[0]));
+exit:
+        pcmcia_disable_device(p_dev);
+        return ret;
+}
+
+static int config_ipwireless(struct ipw_dev *ipw)
+{
+        struct pcmcia_device *link = ipw->link;
+        int ret = 0;
+
+        ipw->is_v2_card = 0;
+        link->config_flags |= CONF_AUTO_SET_IO | CONF_AUTO_SET_IOMEM |
+                CONF_ENABLE_IRQ;
+
+        ret = pcmcia_loop_config(link, ipwireless_probe, ipw);
+        if (ret != 0)
+                return ret;
+
+        INIT_WORK(&ipw->work_reboot, signalled_reboot_work);
+
+        ipwireless_init_hardware_v1(ipw->hardware, link->resource[0]->start,
+                                    ipw->attr_memory, ipw->common_memory,
+                                    ipw->is_v2_card, signalled_reboot_callback,
+                                    ipw);
+
+        ret = pcmcia_request_irq(link, ipwireless_interrupt);
+        if (ret != 0)
+                goto exit;
+
+        printk(KERN_INFO IPWIRELESS_PCCARD_NAME ": Card type %s\n",
+                        ipw->is_v2_card ? "V2/V3" : "V1");
+        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                ": I/O ports %pR, irq %d\n", link->resource[0],
+                        (unsigned int) link->irq);
+        if (ipw->attr_memory && ipw->common_memory)
+                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+                        ": attr memory %pR, common memory %pR\n",
+                        link->resource[3],
+                        link->resource[2]);
+
+        ipw->network = ipwireless_network_create(ipw->hardware);
+        if (!ipw->network)
+                goto exit;
+
+        ipw->tty = ipwireless_tty_create(ipw->hardware, ipw->network);
+        if (!ipw->tty)
+                goto exit;
+
+        ipwireless_init_hardware_v2_v3(ipw->hardware);
+
+        /*
+         * Do the RequestConfiguration last, because it enables interrupts.
+         * Then we don't get any interrupts before we're ready for them.
+         */
+        ret = pcmcia_enable_device(link);
+        if (ret != 0)
+                goto exit;
+
+        return 0;
+
+exit:
+        if (ipw->common_memory) {
+                release_mem_region(link->resource[2]->start,
+                                resource_size(link->resource[2]));
+                iounmap(ipw->common_memory);
+        }
+        if (ipw->attr_memory) {
+                release_mem_region(link->resource[3]->start,
+                                resource_size(link->resource[3]));
+                iounmap(ipw->attr_memory);
+        }
+        pcmcia_disable_device(link);
+        return -1;
+}
+
+static void release_ipwireless(struct ipw_dev *ipw)
+{
+        release_region(ipw->link->resource[0]->start,
+                       resource_size(ipw->link->resource[0]));
+        if (ipw->common_memory) {
+                release_mem_region(ipw->link->resource[2]->start,
+                                resource_size(ipw->link->resource[2]));
+                iounmap(ipw->common_memory);
+        }
+        if (ipw->attr_memory) {
+                release_mem_region(ipw->link->resource[3]->start,
+                                resource_size(ipw->link->resource[3]));
+                iounmap(ipw->attr_memory);
+        }
+        pcmcia_disable_device(ipw->link);
+}
+
+/*
+ * ipwireless_attach() creates an "instance" of the driver, allocating
+ * local data structures for one device (one interface).  The device
+ * is registered with Card Services.
+ *
+ * The pcmcia_device structure is initialized, but we don't actually
+ * configure the card at this point -- we wait until we receive a
+ * card insertion event.
+ */
+static int ipwireless_attach(struct pcmcia_device *link)
+{
+        struct ipw_dev *ipw;
+        int ret;
+
+        ipw = kzalloc(sizeof(struct ipw_dev), GFP_KERNEL);
+        if (!ipw)
+                return -ENOMEM;
+
+        ipw->link = link;
+        link->priv = ipw;
+
+        ipw->hardware = ipwireless_hardware_create();
+        if (!ipw->hardware) {
+                kfree(ipw);
+                return -ENOMEM;
+        }
+        /* RegisterClient will call config_ipwireless */
+
+        ret = config_ipwireless(ipw);
+
+        if (ret != 0) {
+                ipwireless_detach(link);
+                return ret;
+        }
+
+        return 0;
+}
+
+/*
+ * This deletes a driver "instance".  The device is de-registered with
+ * Card Services.  If it has been released, all local data structures
+ * are freed.  Otherwise, the structures will be freed when the device
+ * is released.
+ */
+static void ipwireless_detach(struct pcmcia_device *link)
+{
+        struct ipw_dev *ipw = link->priv;
+
+        release_ipwireless(ipw);
+
+        if (ipw->tty != NULL)
+                ipwireless_tty_free(ipw->tty);
+        if (ipw->network != NULL)
+                ipwireless_network_free(ipw->network);
+        if (ipw->hardware != NULL)
+                ipwireless_hardware_free(ipw->hardware);
+        kfree(ipw);
+}
+
+static struct pcmcia_driver me = {
+        .owner          = THIS_MODULE,
+        .probe          = ipwireless_attach,
+        .remove         = ipwireless_detach,
+        .name           = IPWIRELESS_PCCARD_NAME,
+        .id_table       = ipw_ids
+};
+
+/*
+ * Module insertion : initialisation of the module.
+ * Register the card with cardmgr...
+ */
+static int __init init_ipwireless(void)
+{
+        int ret;
+
+        ret = ipwireless_tty_init();
+        if (ret != 0)
+                return ret;
+
+        ret = pcmcia_register_driver(&me);
+        if (ret != 0)
+                ipwireless_tty_release();
+
+        return ret;
+}
+
+/*
+ * Module removal
+ */
+static void __exit exit_ipwireless(void)
+{
+        pcmcia_unregister_driver(&me);
+        ipwireless_tty_release();
+}
+
+module_init(init_ipwireless);
+module_exit(exit_ipwireless);
+
+MODULE_AUTHOR(IPWIRELESS_PCMCIA_AUTHOR);
+MODULE_DESCRIPTION(IPWIRELESS_PCCARD_NAME " " IPWIRELESS_PCMCIA_VERSION);
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/ipwireless/main.h b/drivers/tty/ipwireless/main.h
new file mode 100644
index 000000000000..f2cbb116bccb
--- /dev/null
+++ b/drivers/tty/ipwireless/main.h
@@ -0,0 +1,68 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#ifndef _IPWIRELESS_CS_H_
+#define _IPWIRELESS_CS_H_
+
+#include <linux/sched.h>
+#include <linux/types.h>
+
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+
+#include "hardware.h"
+
+#define IPWIRELESS_PCCARD_NAME          "ipwireless"
+#define IPWIRELESS_PCMCIA_VERSION       "1.1"
+#define IPWIRELESS_PCMCIA_AUTHOR        \
+        "Stephen Blackheath, Ben Martel, Jiri Kosina and David Sterba"
+
+#define IPWIRELESS_TX_QUEUE_SIZE  262144
+#define IPWIRELESS_RX_QUEUE_SIZE  262144
+
+#define IPWIRELESS_STATE_DEBUG
+
+struct ipw_hardware;
+struct ipw_network;
+struct ipw_tty;
+
+struct ipw_dev {
+        struct pcmcia_device *link;
+        int is_v2_card;
+
+        void __iomem *attr_memory;
+
+        void __iomem *common_memory;
+
+        /* Reference to attribute memory, containing CIS data */
+        void *attribute_memory;
+
+        /* Hardware context */
+        struct ipw_hardware *hardware;
+        /* Network layer context */
+        struct ipw_network *network;
+        /* TTY device context */
+        struct ipw_tty *tty;
+        struct work_struct work_reboot;
+};
+
+/* Module parametres */
+extern int ipwireless_debug;
+extern int ipwireless_loopback;
+extern int ipwireless_out_queue;
+
+#endif
diff --git a/drivers/tty/ipwireless/network.c b/drivers/tty/ipwireless/network.c
new file mode 100644
index 000000000000..f7daeea598e4
--- /dev/null
+++ b/drivers/tty/ipwireless/network.c
@@ -0,0 +1,508 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/ppp_channel.h>
+#include <linux/ppp_defs.h>
+#include <linux/slab.h>
+#include <linux/if_ppp.h>
+#include <linux/skbuff.h>
+
+#include "network.h"
+#include "hardware.h"
+#include "main.h"
+#include "tty.h"
+
+#define MAX_ASSOCIATED_TTYS 2
+
+#define SC_RCV_BITS     (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
+
+struct ipw_network {
+        /* Hardware context, used for calls to hardware layer. */
+        struct ipw_hardware *hardware;
+        /* Context for kernel 'generic_ppp' functionality */
+        struct ppp_channel *ppp_channel;
+        /* tty context connected with IPW console */
+        struct ipw_tty *associated_ttys[NO_OF_IPW_CHANNELS][MAX_ASSOCIATED_TTYS];
+        /* True if ppp needs waking up once we're ready to xmit */
+        int ppp_blocked;
+        /* Number of packets queued up in hardware module. */
+        int outgoing_packets_queued;
+        /* Spinlock to avoid interrupts during shutdown */
+        spinlock_t lock;
+        struct mutex close_lock;
+
+        /* PPP ioctl data, not actually used anywere */
+        unsigned int flags;
+        unsigned int rbits;
+        u32 xaccm[8];
+        u32 raccm;
+        int mru;
+
+        int shutting_down;
+        unsigned int ras_control_lines;
+
+        struct work_struct work_go_online;
+        struct work_struct work_go_offline;
+};
+
+static void notify_packet_sent(void *callback_data, unsigned int packet_length)
+{
+        struct ipw_network *network = callback_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&network->lock, flags);
+        network->outgoing_packets_queued--;
+        if (network->ppp_channel != NULL) {
+                if (network->ppp_blocked) {
+                        network->ppp_blocked = 0;
+                        spin_unlock_irqrestore(&network->lock, flags);
+                        ppp_output_wakeup(network->ppp_channel);
+                        if (ipwireless_debug)
+                                printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
+                                       ": ppp unblocked\n");
+                } else
+                        spin_unlock_irqrestore(&network->lock, flags);
+        } else
+                spin_unlock_irqrestore(&network->lock, flags);
+}
+
+/*
+ * Called by the ppp system when it has a packet to send to the hardware.
+ */
+static int ipwireless_ppp_start_xmit(struct ppp_channel *ppp_channel,
+                                     struct sk_buff *skb)
+{
+        struct ipw_network *network = ppp_channel->private;
+        unsigned long flags;
+
+        spin_lock_irqsave(&network->lock, flags);
+        if (network->outgoing_packets_queued < ipwireless_out_queue) {
+                unsigned char *buf;
+                static unsigned char header[] = {
+                        PPP_ALLSTATIONS, /* 0xff */
+                        PPP_UI,          /* 0x03 */
+                };
+                int ret;
+
+                network->outgoing_packets_queued++;
+                spin_unlock_irqrestore(&network->lock, flags);
+
+                /*
+                 * If we have the requested amount of headroom in the skb we
+                 * were handed, then we can add the header efficiently.
+                 */
+                if (skb_headroom(skb) >= 2) {
+                        memcpy(skb_push(skb, 2), header, 2);
+                        ret = ipwireless_send_packet(network->hardware,
+                                               IPW_CHANNEL_RAS, skb->data,
+                                               skb->len,
+                                               notify_packet_sent,
+                                               network);
+                        if (ret == -1) {
+                                skb_pull(skb, 2);
+                                return 0;
+                        }
+                } else {
+                        /* Otherwise (rarely) we do it inefficiently. */
+                        buf = kmalloc(skb->len + 2, GFP_ATOMIC);
+                        if (!buf)
+                                return 0;
+                        memcpy(buf + 2, skb->data, skb->len);
+                        memcpy(buf, header, 2);
+                        ret = ipwireless_send_packet(network->hardware,
+                                               IPW_CHANNEL_RAS, buf,
+                                               skb->len + 2,
+                                               notify_packet_sent,
+                                               network);
+                        kfree(buf);
+                        if (ret == -1)
+                                return 0;
+                }
+                kfree_skb(skb);
+                return 1;
+        } else {
+                /*
+                 * Otherwise reject the packet, and flag that the ppp system
+                 * needs to be unblocked once we are ready to send.
+                 */
+                network->ppp_blocked = 1;
+                spin_unlock_irqrestore(&network->lock, flags);
+                if (ipwireless_debug)
+                        printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": ppp blocked\n");
+                return 0;
+        }
+}
+
+/* Handle an ioctl call that has come in via ppp. (copy of ppp_async_ioctl() */
+static int ipwireless_ppp_ioctl(struct ppp_channel *ppp_channel,
+                                unsigned int cmd, unsigned long arg)
+{
+        struct ipw_network *network = ppp_channel->private;
+        int err, val;
+        u32 accm[8];
+        int __user *user_arg = (int __user *) arg;
+
+        err = -EFAULT;
+        switch (cmd) {
+        case PPPIOCGFLAGS:
+                val = network->flags | network->rbits;
+                if (put_user(val, user_arg))
+                        break;
+                err = 0;
+                break;
+
+        case PPPIOCSFLAGS:
+                if (get_user(val, user_arg))
+                        break;
+                network->flags = val & ~SC_RCV_BITS;
+                network->rbits = val & SC_RCV_BITS;
+                err = 0;
+                break;
+
+        case PPPIOCGASYNCMAP:
+                if (put_user(network->xaccm[0], user_arg))
+                        break;
+                err = 0;
+                break;
+
+        case PPPIOCSASYNCMAP:
+                if (get_user(network->xaccm[0], user_arg))
+                        break;
+                err = 0;
+                break;
+
+        case PPPIOCGRASYNCMAP:
+                if (put_user(network->raccm, user_arg))
+                        break;
+                err = 0;
+                break;
+
+        case PPPIOCSRASYNCMAP:
+                if (get_user(network->raccm, user_arg))
+                        break;
+                err = 0;
+                break;
+
+        case PPPIOCGXASYNCMAP:
+                if (copy_to_user((void __user *) arg, network->xaccm,
+                                        sizeof(network->xaccm)))
+                        break;
+                err = 0;
+                break;
+
+        case PPPIOCSXASYNCMAP:
+                if (copy_from_user(accm, (void __user *) arg, sizeof(accm)))
+                        break;
+                accm[2] &= ~0x40000000U;        /* can't escape 0x5e */
+                accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
+                memcpy(network->xaccm, accm, sizeof(network->xaccm));
+                err = 0;
+                break;
+
+        case PPPIOCGMRU:
+                if (put_user(network->mru, user_arg))
+                        break;
+                err = 0;
+                break;
+
+        case PPPIOCSMRU:
+                if (get_user(val, user_arg))
+                        break;
+                if (val < PPP_MRU)
+                        val = PPP_MRU;
+                network->mru = val;
+                err = 0;
+                break;
+
+        default:
+                err = -ENOTTY;
+        }
+
+        return err;
+}
+
+static const struct ppp_channel_ops ipwireless_ppp_channel_ops = {
+        .start_xmit = ipwireless_ppp_start_xmit,
+        .ioctl      = ipwireless_ppp_ioctl
+};
+
+static void do_go_online(struct work_struct *work_go_online)
+{
+        struct ipw_network *network =
+                container_of(work_go_online, struct ipw_network,
+                                work_go_online);
+        unsigned long flags;
+
+        spin_lock_irqsave(&network->lock, flags);
+        if (!network->ppp_channel) {
+                struct ppp_channel *channel;
+
+                spin_unlock_irqrestore(&network->lock, flags);
+                channel = kzalloc(sizeof(struct ppp_channel), GFP_KERNEL);
+                if (!channel) {
+                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                                        ": unable to allocate PPP channel\n");
+                        return;
+                }
+                channel->private = network;
+                channel->mtu = 16384;   /* Wild guess */
+                channel->hdrlen = 2;
+                channel->ops = &ipwireless_ppp_channel_ops;
+
+                network->flags = 0;
+                network->rbits = 0;
+                network->mru = PPP_MRU;
+                memset(network->xaccm, 0, sizeof(network->xaccm));
+                network->xaccm[0] = ~0U;
+                network->xaccm[3] = 0x60000000U;
+                network->raccm = ~0U;
+                ppp_register_channel(channel);
+                spin_lock_irqsave(&network->lock, flags);
+                network->ppp_channel = channel;
+        }
+        spin_unlock_irqrestore(&network->lock, flags);
+}
+
+static void do_go_offline(struct work_struct *work_go_offline)
+{
+        struct ipw_network *network =
+                container_of(work_go_offline, struct ipw_network,
+                                work_go_offline);
+        unsigned long flags;
+
+        mutex_lock(&network->close_lock);
+        spin_lock_irqsave(&network->lock, flags);
+        if (network->ppp_channel != NULL) {
+                struct ppp_channel *channel = network->ppp_channel;
+
+                network->ppp_channel = NULL;
+                spin_unlock_irqrestore(&network->lock, flags);
+                mutex_unlock(&network->close_lock);
+                ppp_unregister_channel(channel);
+        } else {
+                spin_unlock_irqrestore(&network->lock, flags);
+                mutex_unlock(&network->close_lock);
+        }
+}
+
+void ipwireless_network_notify_control_line_change(struct ipw_network *network,
+                                                   unsigned int channel_idx,
+                                                   unsigned int control_lines,
+                                                   unsigned int changed_mask)
+{
+        int i;
+
+        if (channel_idx == IPW_CHANNEL_RAS)
+                network->ras_control_lines = control_lines;
+
+        for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
+                struct ipw_tty *tty =
+                        network->associated_ttys[channel_idx][i];
+
+                /*
+                 * If it's associated with a tty (other than the RAS channel
+                 * when we're online), then send the data to that tty.  The RAS
+                 * channel's data is handled above - it always goes through
+                 * ppp_generic.
+                 */
+                if (tty)
+                        ipwireless_tty_notify_control_line_change(tty,
+                                                                  channel_idx,
+                                                                  control_lines,
+                                                                  changed_mask);
+        }
+}
+
+/*
+ * Some versions of firmware stuff packets with 0xff 0x03 (PPP: ALLSTATIONS, UI)
+ * bytes, which are required on sent packet, but not always present on received
+ * packets
+ */
+static struct sk_buff *ipw_packet_received_skb(unsigned char *data,
+                                               unsigned int length)
+{
+        struct sk_buff *skb;
+
+        if (length > 2 && data[0] == PPP_ALLSTATIONS && data[1] == PPP_UI) {
+                length -= 2;
+                data += 2;
+        }
+
+        skb = dev_alloc_skb(length + 4);
+        skb_reserve(skb, 2);
+        memcpy(skb_put(skb, length), data, length);
+
+        return skb;
+}
+
+void ipwireless_network_packet_received(struct ipw_network *network,
+                                        unsigned int channel_idx,
+                                        unsigned char *data,
+                                        unsigned int length)
+{
+        int i;
+        unsigned long flags;
+
+        for (i = 0; i < MAX_ASSOCIATED_TTYS; i++) {
+                struct ipw_tty *tty = network->associated_ttys[channel_idx][i];
+
+                if (!tty)
+                        continue;
+
+                /*
+                 * If it's associated with a tty (other than the RAS channel
+                 * when we're online), then send the data to that tty.  The RAS
+                 * channel's data is handled above - it always goes through
+                 * ppp_generic.
+                 */
+                if (channel_idx == IPW_CHANNEL_RAS
+                                && (network->ras_control_lines &
+                                        IPW_CONTROL_LINE_DCD) != 0
+                                && ipwireless_tty_is_modem(tty)) {
+                        /*
+                         * If data came in on the RAS channel and this tty is
+                         * the modem tty, and we are online, then we send it to
+                         * the PPP layer.
+                         */
+                        mutex_lock(&network->close_lock);
+                        spin_lock_irqsave(&network->lock, flags);
+                        if (network->ppp_channel != NULL) {
+                                struct sk_buff *skb;
+
+                                spin_unlock_irqrestore(&network->lock,
+                                                flags);
+
+                                /* Send the data to the ppp_generic module. */
+                                skb = ipw_packet_received_skb(data, length);
+                                ppp_input(network->ppp_channel, skb);
+                        } else
+                                spin_unlock_irqrestore(&network->lock,
+                                                flags);
+                        mutex_unlock(&network->close_lock);
+                }
+                /* Otherwise we send it out the tty. */
+                else
+                        ipwireless_tty_received(tty, data, length);
+        }
+}
+
+struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
+{
+        struct ipw_network *network =
+                kzalloc(sizeof(struct ipw_network), GFP_ATOMIC);
+
+        if (!network)
+                return NULL;
+
+        spin_lock_init(&network->lock);
+        mutex_init(&network->close_lock);
+
+        network->hardware = hw;
+
+        INIT_WORK(&network->work_go_online, do_go_online);
+        INIT_WORK(&network->work_go_offline, do_go_offline);
+
+        ipwireless_associate_network(hw, network);
+
+        return network;
+}
+
+void ipwireless_network_free(struct ipw_network *network)
+{
+        network->shutting_down = 1;
+
+        ipwireless_ppp_close(network);
+        flush_work_sync(&network->work_go_online);
+        flush_work_sync(&network->work_go_offline);
+
+        ipwireless_stop_interrupts(network->hardware);
+        ipwireless_associate_network(network->hardware, NULL);
+
+        kfree(network);
+}
+
+void ipwireless_associate_network_tty(struct ipw_network *network,
+                                      unsigned int channel_idx,
+                                      struct ipw_tty *tty)
+{
+        int i;
+
+        for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
+                if (network->associated_ttys[channel_idx][i] == NULL) {
+                        network->associated_ttys[channel_idx][i] = tty;
+                        break;
+                }
+}
+
+void ipwireless_disassociate_network_ttys(struct ipw_network *network,
+                                          unsigned int channel_idx)
+{
+        int i;
+
+        for (i = 0; i < MAX_ASSOCIATED_TTYS; i++)
+                network->associated_ttys[channel_idx][i] = NULL;
+}
+
+void ipwireless_ppp_open(struct ipw_network *network)
+{
+        if (ipwireless_debug)
+                printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": online\n");
+        schedule_work(&network->work_go_online);
+}
+
+void ipwireless_ppp_close(struct ipw_network *network)
+{
+        /* Disconnect from the wireless network. */
+        if (ipwireless_debug)
+                printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME ": offline\n");
+        schedule_work(&network->work_go_offline);
+}
+
+int ipwireless_ppp_channel_index(struct ipw_network *network)
+{
+        int ret = -1;
+        unsigned long flags;
+
+        spin_lock_irqsave(&network->lock, flags);
+        if (network->ppp_channel != NULL)
+                ret = ppp_channel_index(network->ppp_channel);
+        spin_unlock_irqrestore(&network->lock, flags);
+
+        return ret;
+}
+
+int ipwireless_ppp_unit_number(struct ipw_network *network)
+{
+        int ret = -1;
+        unsigned long flags;
+
+        spin_lock_irqsave(&network->lock, flags);
+        if (network->ppp_channel != NULL)
+                ret = ppp_unit_number(network->ppp_channel);
+        spin_unlock_irqrestore(&network->lock, flags);
+
+        return ret;
+}
+
+int ipwireless_ppp_mru(const struct ipw_network *network)
+{
+        return network->mru;
+}
diff --git a/drivers/tty/ipwireless/network.h b/drivers/tty/ipwireless/network.h
new file mode 100644
index 000000000000..561f765b3334
--- /dev/null
+++ b/drivers/tty/ipwireless/network.h
@@ -0,0 +1,53 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#ifndef _IPWIRELESS_CS_NETWORK_H_
+#define _IPWIRELESS_CS_NETWORK_H_
+
+#include <linux/types.h>
+
+struct ipw_network;
+struct ipw_tty;
+struct ipw_hardware;
+
+/* Definitions of the different channels on the PCMCIA UE */
+#define IPW_CHANNEL_RAS      0
+#define IPW_CHANNEL_DIALLER  1
+#define IPW_CHANNEL_CONSOLE  2
+#define NO_OF_IPW_CHANNELS   5
+
+void ipwireless_network_notify_control_line_change(struct ipw_network *net,
+                unsigned int channel_idx, unsigned int control_lines,
+                unsigned int control_mask);
+void ipwireless_network_packet_received(struct ipw_network *net,
+                unsigned int channel_idx, unsigned char *data,
+                unsigned int length);
+struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw);
+void ipwireless_network_free(struct ipw_network *net);
+void ipwireless_associate_network_tty(struct ipw_network *net,
+                unsigned int channel_idx, struct ipw_tty *tty);
+void ipwireless_disassociate_network_ttys(struct ipw_network *net,
+                unsigned int channel_idx);
+
+void ipwireless_ppp_open(struct ipw_network *net);
+
+void ipwireless_ppp_close(struct ipw_network *net);
+int ipwireless_ppp_channel_index(struct ipw_network *net);
+int ipwireless_ppp_unit_number(struct ipw_network *net);
+int ipwireless_ppp_mru(const struct ipw_network *net);
+
+#endif
diff --git a/drivers/tty/ipwireless/setup_protocol.h b/drivers/tty/ipwireless/setup_protocol.h
new file mode 100644
index 000000000000..9d6bcc77c73c
--- /dev/null
+++ b/drivers/tty/ipwireless/setup_protocol.h
@@ -0,0 +1,108 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#ifndef _IPWIRELESS_CS_SETUP_PROTOCOL_H_
+#define _IPWIRELESS_CS_SETUP_PROTOCOL_H_
+
+/* Version of the setup protocol and transport protocols */
+#define TL_SETUP_VERSION                1
+
+#define TL_SETUP_VERSION_QRY_TMO        1000
+#define TL_SETUP_MAX_VERSION_QRY        30
+
+/* Message numbers 0-9 are obsoleted and must not be reused! */
+#define TL_SETUP_SIGNO_GET_VERSION_QRY  10
+#define TL_SETUP_SIGNO_GET_VERSION_RSP  11
+#define TL_SETUP_SIGNO_CONFIG_MSG       12
+#define TL_SETUP_SIGNO_CONFIG_DONE_MSG  13
+#define TL_SETUP_SIGNO_OPEN_MSG         14
+#define TL_SETUP_SIGNO_CLOSE_MSG        15
+
+#define TL_SETUP_SIGNO_INFO_MSG     20
+#define TL_SETUP_SIGNO_INFO_MSG_ACK 21
+
+#define TL_SETUP_SIGNO_REBOOT_MSG      22
+#define TL_SETUP_SIGNO_REBOOT_MSG_ACK  23
+
+/* Synchronous start-messages */
+struct tl_setup_get_version_qry {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_GET_VERSION_QRY */
+} __attribute__ ((__packed__));
+
+struct tl_setup_get_version_rsp {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_GET_VERSION_RSP */
+        unsigned char version;          /* TL_SETUP_VERSION */
+} __attribute__ ((__packed__));
+
+struct tl_setup_config_msg {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_CONFIG_MSG */
+        unsigned char port_no;
+        unsigned char prio_data;
+        unsigned char prio_ctrl;
+} __attribute__ ((__packed__));
+
+struct tl_setup_config_done_msg {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_CONFIG_DONE_MSG */
+} __attribute__ ((__packed__));
+
+/* Asyncronous messages */
+struct tl_setup_open_msg {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_OPEN_MSG */
+        unsigned char port_no;
+} __attribute__ ((__packed__));
+
+struct tl_setup_close_msg {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_CLOSE_MSG */
+        unsigned char port_no;
+} __attribute__ ((__packed__));
+
+/* Driver type  - for use in tl_setup_info_msg.driver_type */
+#define COMM_DRIVER     0
+#define NDISWAN_DRIVER  1
+#define NDISWAN_DRIVER_MAJOR_VERSION  2
+#define NDISWAN_DRIVER_MINOR_VERSION  0
+
+/*
+ * It should not matter when this message comes over as we just store the
+ * results and send the ACK.
+ */
+struct tl_setup_info_msg {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_INFO_MSG */
+        unsigned char driver_type;
+        unsigned char major_version;
+        unsigned char minor_version;
+} __attribute__ ((__packed__));
+
+struct tl_setup_info_msgAck {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_INFO_MSG_ACK */
+} __attribute__ ((__packed__));
+
+struct TlSetupRebootMsgAck {
+        unsigned char sig_no;           /* TL_SETUP_SIGNO_REBOOT_MSG_ACK */
+} __attribute__ ((__packed__));
+
+/* Define a union of all the msgs that the driver can receive from the card.*/
+union ipw_setup_rx_msg {
+        unsigned char sig_no;
+        struct tl_setup_get_version_rsp version_rsp_msg;
+        struct tl_setup_open_msg open_msg;
+        struct tl_setup_close_msg close_msg;
+        struct tl_setup_info_msg InfoMsg;
+        struct tl_setup_info_msgAck info_msg_ack;
+} __attribute__ ((__packed__));
+
+#endif                          /* _IPWIRELESS_CS_SETUP_PROTOCOL_H_ */
diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
new file mode 100644
index 000000000000..ef92869502a7
--- /dev/null
+++ b/drivers/tty/ipwireless/tty.c
@@ -0,0 +1,679 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/ppp_defs.h>
+#include <linux/if.h>
+#include <linux/if_ppp.h>
+#include <linux/sched.h>
+#include <linux/serial.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/uaccess.h>
+
+#include "tty.h"
+#include "network.h"
+#include "hardware.h"
+#include "main.h"
+
+#define IPWIRELESS_PCMCIA_START         (0)
+#define IPWIRELESS_PCMCIA_MINORS        (24)
+#define IPWIRELESS_PCMCIA_MINOR_RANGE   (8)
+
+#define TTYTYPE_MODEM    (0)
+#define TTYTYPE_MONITOR  (1)
+#define TTYTYPE_RAS_RAW  (2)
+
+struct ipw_tty {
+        int index;
+        struct ipw_hardware *hardware;
+        unsigned int channel_idx;
+        unsigned int secondary_channel_idx;
+        int tty_type;
+        struct ipw_network *network;
+        struct tty_struct *linux_tty;
+        int open_count;
+        unsigned int control_lines;
+        struct mutex ipw_tty_mutex;
+        int tx_bytes_queued;
+        int closing;
+};
+
+static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS];
+
+static struct tty_driver *ipw_tty_driver;
+
+static char *tty_type_name(int tty_type)
+{
+        static char *channel_names[] = {
+                "modem",
+                "monitor",
+                "RAS-raw"
+        };
+
+        return channel_names[tty_type];
+}
+
+static void report_registering(struct ipw_tty *tty)
+{
+        char *iftype = tty_type_name(tty->tty_type);
+
+        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+               ": registering %s device ttyIPWp%d\n", iftype, tty->index);
+}
+
+static void report_deregistering(struct ipw_tty *tty)
+{
+        char *iftype = tty_type_name(tty->tty_type);
+
+        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
+               ": deregistering %s device ttyIPWp%d\n", iftype,
+               tty->index);
+}
+
+static struct ipw_tty *get_tty(int minor)
+{
+        if (minor < ipw_tty_driver->minor_start
+                        || minor >= ipw_tty_driver->minor_start +
+                        IPWIRELESS_PCMCIA_MINORS)
+                return NULL;
+        else {
+                int minor_offset = minor - ipw_tty_driver->minor_start;
+
+                /*
+                 * The 'ras_raw' channel is only available when 'loopback' mode
+                 * is enabled.
+                 * Number of minor starts with 16 (_RANGE * _RAS_RAW).
+                 */
+                if (!ipwireless_loopback &&
+                                minor_offset >=
+                                 IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW)
+                        return NULL;
+
+                return ttys[minor_offset];
+        }
+}
+
+static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
+{
+        int minor = linux_tty->index;
+        struct ipw_tty *tty = get_tty(minor);
+
+        if (!tty)
+                return -ENODEV;
+
+        mutex_lock(&tty->ipw_tty_mutex);
+
+        if (tty->closing) {
+                mutex_unlock(&tty->ipw_tty_mutex);
+                return -ENODEV;
+        }
+        if (tty->open_count == 0)
+                tty->tx_bytes_queued = 0;
+
+        tty->open_count++;
+
+        tty->linux_tty = linux_tty;
+        linux_tty->driver_data = tty;
+        linux_tty->low_latency = 1;
+
+        if (tty->tty_type == TTYTYPE_MODEM)
+                ipwireless_ppp_open(tty->network);
+
+        mutex_unlock(&tty->ipw_tty_mutex);
+
+        return 0;
+}
+
+static void do_ipw_close(struct ipw_tty *tty)
+{
+        tty->open_count--;
+
+        if (tty->open_count == 0) {
+                struct tty_struct *linux_tty = tty->linux_tty;
+
+                if (linux_tty != NULL) {
+                        tty->linux_tty = NULL;
+                        linux_tty->driver_data = NULL;
+
+                        if (tty->tty_type == TTYTYPE_MODEM)
+                                ipwireless_ppp_close(tty->network);
+                }
+        }
+}
+
+static void ipw_hangup(struct tty_struct *linux_tty)
+{
+        struct ipw_tty *tty = linux_tty->driver_data;
+
+        if (!tty)
+                return;
+
+        mutex_lock(&tty->ipw_tty_mutex);
+        if (tty->open_count == 0) {
+                mutex_unlock(&tty->ipw_tty_mutex);
+                return;
+        }
+
+        do_ipw_close(tty);
+
+        mutex_unlock(&tty->ipw_tty_mutex);
+}
+
+static void ipw_close(struct tty_struct *linux_tty, struct file *filp)
+{
+        ipw_hangup(linux_tty);
+}
+
+/* Take data received from hardware, and send it out the tty */
+void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
+                        unsigned int length)
+{
+        struct tty_struct *linux_tty;
+        int work = 0;
+
+        mutex_lock(&tty->ipw_tty_mutex);
+        linux_tty = tty->linux_tty;
+        if (linux_tty == NULL) {
+                mutex_unlock(&tty->ipw_tty_mutex);
+                return;
+        }
+
+        if (!tty->open_count) {
+                mutex_unlock(&tty->ipw_tty_mutex);
+                return;
+        }
+        mutex_unlock(&tty->ipw_tty_mutex);
+
+        work = tty_insert_flip_string(linux_tty, data, length);
+
+        if (work != length)
+                printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
+                                ": %d chars not inserted to flip buffer!\n",
+                                length - work);
+
+        /*
+         * This may sleep if ->low_latency is set
+         */
+        if (work)
+                tty_flip_buffer_push(linux_tty);
+}
+
+static void ipw_write_packet_sent_callback(void *callback_data,
+                                           unsigned int packet_length)
+{
+        struct ipw_tty *tty = callback_data;
+
+        /*
+         * Packet has been sent, so we subtract the number of bytes from our
+         * tally of outstanding TX bytes.
+         */
+        tty->tx_bytes_queued -= packet_length;
+}
+
+static int ipw_write(struct tty_struct *linux_tty,
+                     const unsigned char *buf, int count)
+{
+        struct ipw_tty *tty = linux_tty->driver_data;
+        int room, ret;
+
+        if (!tty)
+                return -ENODEV;
+
+        mutex_lock(&tty->ipw_tty_mutex);
+        if (!tty->open_count) {
+                mutex_unlock(&tty->ipw_tty_mutex);
+                return -EINVAL;
+        }
+
+        room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
+        if (room < 0)
+                room = 0;
+        /* Don't allow caller to write any more than we have room for */
+        if (count > room)
+                count = room;
+
+        if (count == 0) {
+                mutex_unlock(&tty->ipw_tty_mutex);
+                return 0;
+        }
+
+        ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS,
+                               buf, count,
+                               ipw_write_packet_sent_callback, tty);
+        if (ret == -1) {
+                mutex_unlock(&tty->ipw_tty_mutex);
+                return 0;
+        }
+
+        tty->tx_bytes_queued += count;
+        mutex_unlock(&tty->ipw_tty_mutex);
+
+        return count;
+}
+
+static int ipw_write_room(struct tty_struct *linux_tty)
+{
+        struct ipw_tty *tty = linux_tty->driver_data;
+        int room;
+
+        /* FIXME: Exactly how is the tty object locked here .. */
+        if (!tty)
+                return -ENODEV;
+
+        if (!tty->open_count)
+                return -EINVAL;
+
+        room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued;
+        if (room < 0)
+                room = 0;
+
+        return room;
+}
+
+static int ipwireless_get_serial_info(struct ipw_tty *tty,
+                                      struct serial_struct __user *retinfo)
+{
+        struct serial_struct tmp;
+
+        if (!retinfo)
+                return (-EFAULT);
+
+        memset(&tmp, 0, sizeof(tmp));
+        tmp.type = PORT_UNKNOWN;
+        tmp.line = tty->index;
+        tmp.port = 0;
+        tmp.irq = 0;
+        tmp.flags = 0;
+        tmp.baud_base = 115200;
+        tmp.close_delay = 0;
+        tmp.closing_wait = 0;
+        tmp.custom_divisor = 0;
+        tmp.hub6 = 0;
+        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+                return -EFAULT;
+
+        return 0;
+}
+
+static int ipw_chars_in_buffer(struct tty_struct *linux_tty)
+{
+        struct ipw_tty *tty = linux_tty->driver_data;
+
+        if (!tty)
+                return 0;
+
+        if (!tty->open_count)
+                return 0;
+
+        return tty->tx_bytes_queued;
+}
+
+static int get_control_lines(struct ipw_tty *tty)
+{
+        unsigned int my = tty->control_lines;
+        unsigned int out = 0;
+
+        if (my & IPW_CONTROL_LINE_RTS)
+                out |= TIOCM_RTS;
+        if (my & IPW_CONTROL_LINE_DTR)
+                out |= TIOCM_DTR;
+        if (my & IPW_CONTROL_LINE_CTS)
+                out |= TIOCM_CTS;
+        if (my & IPW_CONTROL_LINE_DSR)
+                out |= TIOCM_DSR;
+        if (my & IPW_CONTROL_LINE_DCD)
+                out |= TIOCM_CD;
+
+        return out;
+}
+
+static int set_control_lines(struct ipw_tty *tty, unsigned int set,
+                             unsigned int clear)
+{
+        int ret;
+
+        if (set & TIOCM_RTS) {
+                ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1);
+                if (ret)
+                        return ret;
+                if (tty->secondary_channel_idx != -1) {
+                        ret = ipwireless_set_RTS(tty->hardware,
+                                          tty->secondary_channel_idx, 1);
+                        if (ret)
+                                return ret;
+                }
+        }
+        if (set & TIOCM_DTR) {
+                ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1);
+                if (ret)
+                        return ret;
+                if (tty->secondary_channel_idx != -1) {
+                        ret = ipwireless_set_DTR(tty->hardware,
+                                          tty->secondary_channel_idx, 1);
+                        if (ret)
+                                return ret;
+                }
+        }
+        if (clear & TIOCM_RTS) {
+                ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0);
+                if (tty->secondary_channel_idx != -1) {
+                        ret = ipwireless_set_RTS(tty->hardware,
+                                          tty->secondary_channel_idx, 0);
+                        if (ret)
+                                return ret;
+                }
+        }
+        if (clear & TIOCM_DTR) {
+                ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0);
+                if (tty->secondary_channel_idx != -1) {
+                        ret = ipwireless_set_DTR(tty->hardware,
+                                          tty->secondary_channel_idx, 0);
+                        if (ret)
+                                return ret;
+                }
+        }
+        return 0;
+}
+
+static int ipw_tiocmget(struct tty_struct *linux_tty)
+{
+        struct ipw_tty *tty = linux_tty->driver_data;
+        /* FIXME: Exactly how is the tty object locked here .. */
+
+        if (!tty)
+                return -ENODEV;
+
+        if (!tty->open_count)
+                return -EINVAL;
+
+        return get_control_lines(tty);
+}
+
+static int
+ipw_tiocmset(struct tty_struct *linux_tty,
+             unsigned int set, unsigned int clear)
+{
+        struct ipw_tty *tty = linux_tty->driver_data;
+        /* FIXME: Exactly how is the tty object locked here .. */
+
+        if (!tty)
+                return -ENODEV;
+
+        if (!tty->open_count)
+                return -EINVAL;
+
+        return set_control_lines(tty, set, clear);
+}
+
+static int ipw_ioctl(struct tty_struct *linux_tty,
+                     unsigned int cmd, unsigned long arg)
+{
+        struct ipw_tty *tty = linux_tty->driver_data;
+
+        if (!tty)
+                return -ENODEV;
+
+        if (!tty->open_count)
+                return -EINVAL;
+
+        /* FIXME: Exactly how is the tty object locked here .. */
+
+        switch (cmd) {
+        case TIOCGSERIAL:
+                return ipwireless_get_serial_info(tty, (void __user *) arg);
+
+        case TIOCSSERIAL:
+                return 0;       /* Keeps the PCMCIA scripts happy. */
+        }
+
+        if (tty->tty_type == TTYTYPE_MODEM) {
+                switch (cmd) {
+                case PPPIOCGCHAN:
+                        {
+                                int chan = ipwireless_ppp_channel_index(
+                                                        tty->network);
+
+                                if (chan < 0)
+                                        return -ENODEV;
+                                if (put_user(chan, (int __user *) arg))
+                                        return -EFAULT;
+                        }
+                        return 0;
+
+                case PPPIOCGUNIT:
+                        {
+                                int unit = ipwireless_ppp_unit_number(
+                                                tty->network);
+
+                                if (unit < 0)
+                                        return -ENODEV;
+                                if (put_user(unit, (int __user *) arg))
+                                        return -EFAULT;
+                        }
+                        return 0;
+
+                case FIONREAD:
+                        {
+                                int val = 0;
+
+                                if (put_user(val, (int __user *) arg))
+                                        return -EFAULT;
+                        }
+                        return 0;
+                case TCFLSH:
+                        return tty_perform_flush(linux_tty, arg);
+                }
+        }
+        return -ENOIOCTLCMD;
+}
+
+static int add_tty(int j,
+                    struct ipw_hardware *hardware,
+                    struct ipw_network *network, int channel_idx,
+                    int secondary_channel_idx, int tty_type)
+{
+        ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL);
+        if (!ttys[j])
+                return -ENOMEM;
+        ttys[j]->index = j;
+        ttys[j]->hardware = hardware;
+        ttys[j]->channel_idx = channel_idx;
+        ttys[j]->secondary_channel_idx = secondary_channel_idx;
+        ttys[j]->network = network;
+        ttys[j]->tty_type = tty_type;
+        mutex_init(&ttys[j]->ipw_tty_mutex);
+
+        tty_register_device(ipw_tty_driver, j, NULL);
+        ipwireless_associate_network_tty(network, channel_idx, ttys[j]);
+
+        if (secondary_channel_idx != -1)
+                ipwireless_associate_network_tty(network,
+                                                 secondary_channel_idx,
+                                                 ttys[j]);
+        if (get_tty(j + ipw_tty_driver->minor_start) == ttys[j])
+                report_registering(ttys[j]);
+        return 0;
+}
+
+struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware,
+                                      struct ipw_network *network)
+{
+        int i, j;
+
+        for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) {
+                int allfree = 1;
+
+                for (j = i; j < IPWIRELESS_PCMCIA_MINORS;
+                                j += IPWIRELESS_PCMCIA_MINOR_RANGE)
+                        if (ttys[j] != NULL) {
+                                allfree = 0;
+                                break;
+                        }
+
+                if (allfree) {
+                        j = i;
+
+                        if (add_tty(j, hardware, network,
+                                        IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS,
+                                        TTYTYPE_MODEM))
+                                return NULL;
+
+                        j += IPWIRELESS_PCMCIA_MINOR_RANGE;
+                        if (add_tty(j, hardware, network,
+                                        IPW_CHANNEL_DIALLER, -1,
+                                        TTYTYPE_MONITOR))
+                                return NULL;
+
+                        j += IPWIRELESS_PCMCIA_MINOR_RANGE;
+                        if (add_tty(j, hardware, network,
+                                        IPW_CHANNEL_RAS, -1,
+                                        TTYTYPE_RAS_RAW))
+                                return NULL;
+
+                        return ttys[i];
+                }
+        }
+        return NULL;
+}
+
+/*
+ * Must be called before ipwireless_network_free().
+ */
+void ipwireless_tty_free(struct ipw_tty *tty)
+{
+        int j;
+        struct ipw_network *network = ttys[tty->index]->network;
+
+        for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS;
+                        j += IPWIRELESS_PCMCIA_MINOR_RANGE) {
+                struct ipw_tty *ttyj = ttys[j];
+
+                if (ttyj) {
+                        mutex_lock(&ttyj->ipw_tty_mutex);
+                        if (get_tty(j + ipw_tty_driver->minor_start) == ttyj)
+                                report_deregistering(ttyj);
+                        ttyj->closing = 1;
+                        if (ttyj->linux_tty != NULL) {
+                                mutex_unlock(&ttyj->ipw_tty_mutex);
+                                tty_hangup(ttyj->linux_tty);
+                                /* Wait till the tty_hangup has completed */
+                                flush_work_sync(&ttyj->linux_tty->hangup_work);
+                                /* FIXME: Exactly how is the tty object locked here
+                                   against a parallel ioctl etc */
+                                mutex_lock(&ttyj->ipw_tty_mutex);
+                        }
+                        while (ttyj->open_count)
+                                do_ipw_close(ttyj);
+                        ipwireless_disassociate_network_ttys(network,
+                                                             ttyj->channel_idx);
+                        tty_unregister_device(ipw_tty_driver, j);
+                        ttys[j] = NULL;
+                        mutex_unlock(&ttyj->ipw_tty_mutex);
+                        kfree(ttyj);
+                }
+        }
+}
+
+static const struct tty_operations tty_ops = {
+        .open = ipw_open,
+        .close = ipw_close,
+        .hangup = ipw_hangup,
+        .write = ipw_write,
+        .write_room = ipw_write_room,
+        .ioctl = ipw_ioctl,
+        .chars_in_buffer = ipw_chars_in_buffer,
+        .tiocmget = ipw_tiocmget,
+        .tiocmset = ipw_tiocmset,
+};
+
+int ipwireless_tty_init(void)
+{
+        int result;
+
+        ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS);
+        if (!ipw_tty_driver)
+                return -ENOMEM;
+
+        ipw_tty_driver->owner = THIS_MODULE;
+        ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME;
+        ipw_tty_driver->name = "ttyIPWp";
+        ipw_tty_driver->major = 0;
+        ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START;
+        ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+        ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        ipw_tty_driver->init_termios = tty_std_termios;
+        ipw_tty_driver->init_termios.c_cflag =
+            B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        ipw_tty_driver->init_termios.c_ispeed = 9600;
+        ipw_tty_driver->init_termios.c_ospeed = 9600;
+        tty_set_operations(ipw_tty_driver, &tty_ops);
+        result = tty_register_driver(ipw_tty_driver);
+        if (result) {
+                printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                       ": failed to register tty driver\n");
+                put_tty_driver(ipw_tty_driver);
+                return result;
+        }
+
+        return 0;
+}
+
+void ipwireless_tty_release(void)
+{
+        int ret;
+
+        ret = tty_unregister_driver(ipw_tty_driver);
+        put_tty_driver(ipw_tty_driver);
+        if (ret != 0)
+                printk(KERN_ERR IPWIRELESS_PCCARD_NAME
+                        ": tty_unregister_driver failed with code %d\n", ret);
+}
+
+int ipwireless_tty_is_modem(struct ipw_tty *tty)
+{
+        return tty->tty_type == TTYTYPE_MODEM;
+}
+
+void
+ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
+                                          unsigned int channel_idx,
+                                          unsigned int control_lines,
+                                          unsigned int changed_mask)
+{
+        unsigned int old_control_lines = tty->control_lines;
+
+        tty->control_lines = (tty->control_lines & ~changed_mask)
+                | (control_lines & changed_mask);
+
+        /*
+         * If DCD is de-asserted, we close the tty so pppd can tell that we
+         * have gone offline.
+         */
+        if ((old_control_lines & IPW_CONTROL_LINE_DCD)
+                        && !(tty->control_lines & IPW_CONTROL_LINE_DCD)
+                        && tty->linux_tty) {
+                tty_hangup(tty->linux_tty);
+        }
+}
+
diff --git a/drivers/tty/ipwireless/tty.h b/drivers/tty/ipwireless/tty.h
new file mode 100644
index 000000000000..747b2d637860
--- /dev/null
+++ b/drivers/tty/ipwireless/tty.h
@@ -0,0 +1,45 @@
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#ifndef _IPWIRELESS_CS_TTY_H_
+#define _IPWIRELESS_CS_TTY_H_
+
+#include <linux/types.h>
+#include <linux/sched.h>
+
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+
+struct ipw_tty;
+struct ipw_network;
+struct ipw_hardware;
+
+int ipwireless_tty_init(void);
+void ipwireless_tty_release(void);
+
+struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hw,
+                                      struct ipw_network *net);
+void ipwireless_tty_free(struct ipw_tty *tty);
+void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
+                             unsigned int length);
+int ipwireless_tty_is_modem(struct ipw_tty *tty);
+void ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
+                                               unsigned int channel_idx,
+                                               unsigned int control_lines,
+                                               unsigned int changed_mask);
+
+#endif
diff --git a/drivers/tty/isicom.c b/drivers/tty/isicom.c
new file mode 100644
index 000000000000..db1cf9c328d8
--- /dev/null
+++ b/drivers/tty/isicom.c
@@ -0,0 +1,1736 @@
+/*
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *      Original driver code supplied by Multi-Tech
+ *
+ *      Changes
+ *      1/9/98  alan@lxorguk.ukuu.org.uk
+ *                                      Merge to 2.0.x kernel tree
+ *                                      Obtain and use official major/minors
+ *                                      Loader switched to a misc device
+ *                                      (fixed range check bug as a side effect)
+ *                                      Printk clean up
+ *      9/12/98 alan@lxorguk.ukuu.org.uk
+ *                                      Rough port to 2.1.x
+ *
+ *      10/6/99 sameer                  Merged the ISA and PCI drivers to
+ *                                      a new unified driver.
+ *
+ *      3/9/99  sameer                  Added support for ISI4616 cards.
+ *
+ *      16/9/99 sameer                  We do not force RTS low anymore.
+ *                                      This is to prevent the firmware
+ *                                      from getting confused.
+ *
+ *      26/10/99 sameer                 Cosmetic changes:The driver now
+ *                                      dumps the Port Count information
+ *                                      along with I/O address and IRQ.
+ *
+ *      13/12/99 sameer                 Fixed the problem with IRQ sharing.
+ *
+ *      10/5/00  sameer                 Fixed isicom_shutdown_board()
+ *                                      to not lower DTR on all the ports
+ *                                      when the last port on the card is
+ *                                      closed.
+ *
+ *      10/5/00  sameer                 Signal mask setup command added
+ *                                      to  isicom_setup_port and
+ *                                      isicom_shutdown_port.
+ *
+ *      24/5/00  sameer                 The driver is now SMP aware.
+ *
+ *
+ *      27/11/00 Vinayak P Risbud       Fixed the Driver Crash Problem
+ *
+ *
+ *      03/01/01  anil .s               Added support for resetting the
+ *                                      internal modems on ISI cards.
+ *
+ *      08/02/01  anil .s               Upgraded the driver for kernel
+ *                                      2.4.x
+ *
+ *      11/04/01  Kevin                 Fixed firmware load problem with
+ *                                      ISIHP-4X card
+ *
+ *      30/04/01  anil .s               Fixed the remote login through
+ *                                      ISI port problem. Now the link
+ *                                      does not go down before password
+ *                                      prompt.
+ *
+ *      03/05/01  anil .s               Fixed the problem with IRQ sharing
+ *                                      among ISI-PCI cards.
+ *
+ *      03/05/01  anil .s               Added support to display the version
+ *                                      info during insmod as well as module
+ *                                      listing by lsmod.
+ *
+ *      10/05/01  anil .s               Done the modifications to the source
+ *                                      file and Install script so that the
+ *                                      same installation can be used for
+ *                                      2.2.x and 2.4.x kernel.
+ *
+ *      06/06/01  anil .s               Now we drop both dtr and rts during
+ *                                      shutdown_port as well as raise them
+ *                                      during isicom_config_port.
+ *
+ *      09/06/01 acme@conectiva.com.br  use capable, not suser, do
+ *                                      restore_flags on failure in
+ *                                      isicom_send_break, verify put_user
+ *                                      result
+ *
+ *      11/02/03  ranjeeth              Added support for 230 Kbps and 460 Kbps
+ *                                      Baud index extended to 21
+ *
+ *      20/03/03  ranjeeth              Made to work for Linux Advanced server.
+ *                                      Taken care of license warning.
+ *
+ *      10/12/03  Ravindra              Made to work for Fedora Core 1 of
+ *                                      Red Hat Distribution
+ *
+ *      06/01/05  Alan Cox              Merged the ISI and base kernel strands
+ *                                      into a single 2.6 driver
+ *
+ *      ***********************************************************
+ *
+ *      To use this driver you also need the support package. You
+ *      can find this in RPM format on
+ *              ftp://ftp.linux.org.uk/pub/linux/alan
+ *
+ *      You can find the original tools for this direct from Multitech
+ *              ftp://ftp.multitech.com/ISI-Cards/
+ *
+ *      Having installed the cards the module options (/etc/modprobe.conf)
+ *
+ *      options isicom   io=card1,card2,card3,card4 irq=card1,card2,card3,card4
+ *
+ *      Omit those entries for boards you don't have installed.
+ *
+ *      TODO
+ *              Merge testing
+ *              64-bit verification
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/termios.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/serial.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <asm/system.h>
+
+#include <linux/pci.h>
+
+#include <linux/isicom.h>
+
+#define InterruptTheCard(base) outw(0, (base) + 0xc)
+#define ClearInterrupt(base) inw((base) + 0x0a)
+
+#ifdef DEBUG
+#define isicom_paranoia_check(a, b, c) __isicom_paranoia_check((a), (b), (c))
+#else
+#define isicom_paranoia_check(a, b, c) 0
+#endif
+
+static int isicom_probe(struct pci_dev *, const struct pci_device_id *);
+static void __devexit isicom_remove(struct pci_dev *);
+
+static struct pci_device_id isicom_pci_tbl[] = {
+        { PCI_DEVICE(VENDOR_ID, 0x2028) },
+        { PCI_DEVICE(VENDOR_ID, 0x2051) },
+        { PCI_DEVICE(VENDOR_ID, 0x2052) },
+        { PCI_DEVICE(VENDOR_ID, 0x2053) },
+        { PCI_DEVICE(VENDOR_ID, 0x2054) },
+        { PCI_DEVICE(VENDOR_ID, 0x2055) },
+        { PCI_DEVICE(VENDOR_ID, 0x2056) },
+        { PCI_DEVICE(VENDOR_ID, 0x2057) },
+        { PCI_DEVICE(VENDOR_ID, 0x2058) },
+        { 0 }
+};
+MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);
+
+static struct pci_driver isicom_driver = {
+        .name           = "isicom",
+        .id_table       = isicom_pci_tbl,
+        .probe          = isicom_probe,
+        .remove         = __devexit_p(isicom_remove)
+};
+
+static int prev_card = 3;       /*      start servicing isi_card[0]     */
+static struct tty_driver *isicom_normal;
+
+static void isicom_tx(unsigned long _data);
+static void isicom_start(struct tty_struct *tty);
+
+static DEFINE_TIMER(tx, isicom_tx, 0, 0);
+
+/*   baud index mappings from linux defns to isi */
+
+static signed char linuxb_to_isib[] = {
+        -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17, 18, 19, 20, 21
+};
+
+struct  isi_board {
+        unsigned long           base;
+        int                     irq;
+        unsigned char           port_count;
+        unsigned short          status;
+        unsigned short          port_status; /* each bit for each port */
+        unsigned short          shift_count;
+        struct isi_port         *ports;
+        signed char             count;
+        spinlock_t              card_lock; /* Card wide lock 11/5/00 -sameer */
+        unsigned long           flags;
+        unsigned int            index;
+};
+
+struct  isi_port {
+        unsigned short          magic;
+        struct tty_port         port;
+        u16                     channel;
+        u16                     status;
+        struct isi_board        *card;
+        unsigned char           *xmit_buf;
+        int                     xmit_head;
+        int                     xmit_tail;
+        int                     xmit_cnt;
+};
+
+static struct isi_board isi_card[BOARD_COUNT];
+static struct isi_port  isi_ports[PORT_COUNT];
+
+/*
+ *      Locking functions for card level locking. We need to own both
+ *      the kernel lock for the card and have the card in a position that
+ *      it wants to talk.
+ */
+
+static inline int WaitTillCardIsFree(unsigned long base)
+{
+        unsigned int count = 0;
+        unsigned int a = in_atomic(); /* do we run under spinlock? */
+
+        while (!(inw(base + 0xe) & 0x1) && count++ < 100)
+                if (a)
+                        mdelay(1);
+                else
+                        msleep(1);
+
+        return !(inw(base + 0xe) & 0x1);
+}
+
+static int lock_card(struct isi_board *card)
+{
+        unsigned long base = card->base;
+        unsigned int retries, a;
+
+        for (retries = 0; retries < 10; retries++) {
+                spin_lock_irqsave(&card->card_lock, card->flags);
+                for (a = 0; a < 10; a++) {
+                        if (inw(base + 0xe) & 0x1)
+                                return 1;
+                        udelay(10);
+                }
+                spin_unlock_irqrestore(&card->card_lock, card->flags);
+                msleep(10);
+        }
+        pr_warning("Failed to lock Card (0x%lx)\n", card->base);
+
+        return 0;       /* Failed to acquire the card! */
+}
+
+static void unlock_card(struct isi_board *card)
+{
+        spin_unlock_irqrestore(&card->card_lock, card->flags);
+}
+
+/*
+ *  ISI Card specific ops ...
+ */
+
+/* card->lock HAS to be held */
+static void raise_dtr(struct isi_port *port)
+{
+        struct isi_board *card = port->card;
+        unsigned long base = card->base;
+        u16 channel = port->channel;
+
+        if (WaitTillCardIsFree(base))
+                return;
+
+        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+        outw(0x0504, base);
+        InterruptTheCard(base);
+        port->status |= ISI_DTR;
+}
+
+/* card->lock HAS to be held */
+static inline void drop_dtr(struct isi_port *port)
+{
+        struct isi_board *card = port->card;
+        unsigned long base = card->base;
+        u16 channel = port->channel;
+
+        if (WaitTillCardIsFree(base))
+                return;
+
+        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+        outw(0x0404, base);
+        InterruptTheCard(base);
+        port->status &= ~ISI_DTR;
+}
+
+/* card->lock HAS to be held */
+static inline void raise_rts(struct isi_port *port)
+{
+        struct isi_board *card = port->card;
+        unsigned long base = card->base;
+        u16 channel = port->channel;
+
+        if (WaitTillCardIsFree(base))
+                return;
+
+        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+        outw(0x0a04, base);
+        InterruptTheCard(base);
+        port->status |= ISI_RTS;
+}
+
+/* card->lock HAS to be held */
+static inline void drop_rts(struct isi_port *port)
+{
+        struct isi_board *card = port->card;
+        unsigned long base = card->base;
+        u16 channel = port->channel;
+
+        if (WaitTillCardIsFree(base))
+                return;
+
+        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+        outw(0x0804, base);
+        InterruptTheCard(base);
+        port->status &= ~ISI_RTS;
+}
+
+/* card->lock MUST NOT be held */
+
+static void isicom_dtr_rts(struct tty_port *port, int on)
+{
+        struct isi_port *ip = container_of(port, struct isi_port, port);
+        struct isi_board *card = ip->card;
+        unsigned long base = card->base;
+        u16 channel = ip->channel;
+
+        if (!lock_card(card))
+                return;
+
+        if (on) {
+                outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+                outw(0x0f04, base);
+                InterruptTheCard(base);
+                ip->status |= (ISI_DTR | ISI_RTS);
+        } else {
+                outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+                outw(0x0C04, base);
+                InterruptTheCard(base);
+                ip->status &= ~(ISI_DTR | ISI_RTS);
+        }
+        unlock_card(card);
+}
+
+/* card->lock HAS to be held */
+static void drop_dtr_rts(struct isi_port *port)
+{
+        struct isi_board *card = port->card;
+        unsigned long base = card->base;
+        u16 channel = port->channel;
+
+        if (WaitTillCardIsFree(base))
+                return;
+
+        outw(0x8000 | (channel << card->shift_count) | 0x02, base);
+        outw(0x0c04, base);
+        InterruptTheCard(base);
+        port->status &= ~(ISI_RTS | ISI_DTR);
+}
+
+/*
+ *      ISICOM Driver specific routines ...
+ *
+ */
+
+static inline int __isicom_paranoia_check(struct isi_port const *port,
+        char *name, const char *routine)
+{
+        if (!port) {
+                pr_warning("Warning: bad isicom magic for dev %s in %s.\n",
+                           name, routine);
+                return 1;
+        }
+        if (port->magic != ISICOM_MAGIC) {
+                pr_warning("Warning: NULL isicom port for dev %s in %s.\n",
+                           name, routine);
+                return 1;
+        }
+
+        return 0;
+}
+
+/*
+ *      Transmitter.
+ *
+ *      We shovel data into the card buffers on a regular basis. The card
+ *      will do the rest of the work for us.
+ */
+
+static void isicom_tx(unsigned long _data)
+{
+        unsigned long flags, base;
+        unsigned int retries;
+        short count = (BOARD_COUNT-1), card;
+        short txcount, wrd, residue, word_count, cnt;
+        struct isi_port *port;
+        struct tty_struct *tty;
+
+        /*      find next active board  */
+        card = (prev_card + 1) & 0x0003;
+        while (count-- > 0) {
+                if (isi_card[card].status & BOARD_ACTIVE)
+                        break;
+                card = (card + 1) & 0x0003;
+        }
+        if (!(isi_card[card].status & BOARD_ACTIVE))
+                goto sched_again;
+
+        prev_card = card;
+
+        count = isi_card[card].port_count;
+        port = isi_card[card].ports;
+        base = isi_card[card].base;
+
+        spin_lock_irqsave(&isi_card[card].card_lock, flags);
+        for (retries = 0; retries < 100; retries++) {
+                if (inw(base + 0xe) & 0x1)
+                        break;
+                udelay(2);
+        }
+        if (retries >= 100)
+                goto unlock;
+
+        tty = tty_port_tty_get(&port->port);
+        if (tty == NULL)
+                goto put_unlock;
+
+        for (; count > 0; count--, port++) {
+                /* port not active or tx disabled to force flow control */
+                if (!(port->port.flags & ASYNC_INITIALIZED) ||
+                                !(port->status & ISI_TXOK))
+                        continue;
+
+                txcount = min_t(short, TX_SIZE, port->xmit_cnt);
+                if (txcount <= 0 || tty->stopped || tty->hw_stopped)
+                        continue;
+
+                if (!(inw(base + 0x02) & (1 << port->channel)))
+                        continue;
+
+                pr_debug("txing %d bytes, port%d.\n",
+                         txcount, port->channel + 1);
+                outw((port->channel << isi_card[card].shift_count) | txcount,
+                        base);
+                residue = NO;
+                wrd = 0;
+                while (1) {
+                        cnt = min_t(int, txcount, (SERIAL_XMIT_SIZE
+                                        - port->xmit_tail));
+                        if (residue == YES) {
+                                residue = NO;
+                                if (cnt > 0) {
+                                        wrd |= (port->port.xmit_buf[port->xmit_tail]
+                                                                        << 8);
+                                        port->xmit_tail = (port->xmit_tail + 1)
+                                                & (SERIAL_XMIT_SIZE - 1);
+                                        port->xmit_cnt--;
+                                        txcount--;
+                                        cnt--;
+                                        outw(wrd, base);
+                                } else {
+                                        outw(wrd, base);
+                                        break;
+                                }
+                        }
+                        if (cnt <= 0)
+                                break;
+                        word_count = cnt >> 1;
+                        outsw(base, port->port.xmit_buf+port->xmit_tail, word_count);
+                        port->xmit_tail = (port->xmit_tail
+                                + (word_count << 1)) & (SERIAL_XMIT_SIZE - 1);
+                        txcount -= (word_count << 1);
+                        port->xmit_cnt -= (word_count << 1);
+                        if (cnt & 0x0001) {
+                                residue = YES;
+                                wrd = port->port.xmit_buf[port->xmit_tail];
+                                port->xmit_tail = (port->xmit_tail + 1)
+                                        & (SERIAL_XMIT_SIZE - 1);
+                                port->xmit_cnt--;
+                                txcount--;
+                        }
+                }
+
+                InterruptTheCard(base);
+                if (port->xmit_cnt <= 0)
+                        port->status &= ~ISI_TXOK;
+                if (port->xmit_cnt <= WAKEUP_CHARS)
+                        tty_wakeup(tty);
+        }
+
+put_unlock:
+        tty_kref_put(tty);
+unlock:
+        spin_unlock_irqrestore(&isi_card[card].card_lock, flags);
+        /*      schedule another tx for hopefully in about 10ms */
+sched_again:
+        mod_timer(&tx, jiffies + msecs_to_jiffies(10));
+}
+
+/*
+ *      Main interrupt handler routine
+ */
+
+static irqreturn_t isicom_interrupt(int irq, void *dev_id)
+{
+        struct isi_board *card = dev_id;
+        struct isi_port *port;
+        struct tty_struct *tty;
+        unsigned long base;
+        u16 header, word_count, count, channel;
+        short byte_count;
+        unsigned char *rp;
+
+        if (!card || !(card->status & FIRMWARE_LOADED))
+                return IRQ_NONE;
+
+        base = card->base;
+
+        /* did the card interrupt us? */
+        if (!(inw(base + 0x0e) & 0x02))
+                return IRQ_NONE;
+
+        spin_lock(&card->card_lock);
+
+        /*
+         * disable any interrupts from the PCI card and lower the
+         * interrupt line
+         */
+        outw(0x8000, base+0x04);
+        ClearInterrupt(base);
+
+        inw(base);              /* get the dummy word out */
+        header = inw(base);
+        channel = (header & 0x7800) >> card->shift_count;
+        byte_count = header & 0xff;
+
+        if (channel + 1 > card->port_count) {
+                pr_warning("%s(0x%lx): %d(channel) > port_count.\n",
+                           __func__, base, channel+1);
+                outw(0x0000, base+0x04); /* enable interrupts */
+                spin_unlock(&card->card_lock);
+                return IRQ_HANDLED;
+        }
+        port = card->ports + channel;
+        if (!(port->port.flags & ASYNC_INITIALIZED)) {
+                outw(0x0000, base+0x04); /* enable interrupts */
+                spin_unlock(&card->card_lock);
+                return IRQ_HANDLED;
+        }
+
+        tty = tty_port_tty_get(&port->port);
+        if (tty == NULL) {
+                word_count = byte_count >> 1;
+                while (byte_count > 1) {
+                        inw(base);
+                        byte_count -= 2;
+                }
+                if (byte_count & 0x01)
+                        inw(base);
+                outw(0x0000, base+0x04); /* enable interrupts */
+                spin_unlock(&card->card_lock);
+                return IRQ_HANDLED;
+        }
+
+        if (header & 0x8000) {          /* Status Packet */
+                header = inw(base);
+                switch (header & 0xff) {
+                case 0: /* Change in EIA signals */
+                        if (port->port.flags & ASYNC_CHECK_CD) {
+                                if (port->status & ISI_DCD) {
+                                        if (!(header & ISI_DCD)) {
+                                        /* Carrier has been lost  */
+                                                pr_debug("%s: DCD->low.\n",
+                                                         __func__);
+                                                port->status &= ~ISI_DCD;
+                                                tty_hangup(tty);
+                                        }
+                                } else if (header & ISI_DCD) {
+                                /* Carrier has been detected */
+                                        pr_debug("%s: DCD->high.\n",
+                                                __func__);
+                                        port->status |= ISI_DCD;
+                                        wake_up_interruptible(&port->port.open_wait);
+                                }
+                        } else {
+                                if (header & ISI_DCD)
+                                        port->status |= ISI_DCD;
+                                else
+                                        port->status &= ~ISI_DCD;
+                        }
+
+                        if (port->port.flags & ASYNC_CTS_FLOW) {
+                                if (tty->hw_stopped) {
+                                        if (header & ISI_CTS) {
+                                                port->port.tty->hw_stopped = 0;
+                                                /* start tx ing */
+                                                port->status |= (ISI_TXOK
+                                                        | ISI_CTS);
+                                                tty_wakeup(tty);
+                                        }
+                                } else if (!(header & ISI_CTS)) {
+                                        tty->hw_stopped = 1;
+                                        /* stop tx ing */
+                                        port->status &= ~(ISI_TXOK | ISI_CTS);
+                                }
+                        } else {
+                                if (header & ISI_CTS)
+                                        port->status |= ISI_CTS;
+                                else
+                                        port->status &= ~ISI_CTS;
+                        }
+
+                        if (header & ISI_DSR)
+                                port->status |= ISI_DSR;
+                        else
+                                port->status &= ~ISI_DSR;
+
+                        if (header & ISI_RI)
+                                port->status |= ISI_RI;
+                        else
+                                port->status &= ~ISI_RI;
+
+                        break;
+
+                case 1: /* Received Break !!! */
+                        tty_insert_flip_char(tty, 0, TTY_BREAK);
+                        if (port->port.flags & ASYNC_SAK)
+                                do_SAK(tty);
+                        tty_flip_buffer_push(tty);
+                        break;
+
+                case 2: /* Statistics            */
+                        pr_debug("%s: stats!!!\n", __func__);
+                        break;
+
+                default:
+                        pr_debug("%s: Unknown code in status packet.\n",
+                                 __func__);
+                        break;
+                }
+        } else {                                /* Data   Packet */
+
+                count = tty_prepare_flip_string(tty, &rp, byte_count & ~1);
+                pr_debug("%s: Can rx %d of %d bytes.\n",
+                         __func__, count, byte_count);
+                word_count = count >> 1;
+                insw(base, rp, word_count);
+                byte_count -= (word_count << 1);
+                if (count & 0x0001) {
+                        tty_insert_flip_char(tty,  inw(base) & 0xff,
+                                TTY_NORMAL);
+                        byte_count -= 2;
+                }
+                if (byte_count > 0) {
+                        pr_debug("%s(0x%lx:%d): Flip buffer overflow! dropping bytes...\n",
+                                 __func__, base, channel + 1);
+                /* drain out unread xtra data */
+                while (byte_count > 0) {
+                                inw(base);
+                                byte_count -= 2;
+                        }
+                }
+                tty_flip_buffer_push(tty);
+        }
+        outw(0x0000, base+0x04); /* enable interrupts */
+        spin_unlock(&card->card_lock);
+        tty_kref_put(tty);
+
+        return IRQ_HANDLED;
+}
+
+static void isicom_config_port(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+        struct isi_board *card = port->card;
+        unsigned long baud;
+        unsigned long base = card->base;
+        u16 channel_setup, channel = port->channel,
+                shift_count = card->shift_count;
+        unsigned char flow_ctrl;
+
+        /* FIXME: Switch to new tty baud API */
+        baud = C_BAUD(tty);
+        if (baud & CBAUDEX) {
+                baud &= ~CBAUDEX;
+
+                /*  if CBAUDEX bit is on and the baud is set to either 50 or 75
+                 *  then the card is programmed for 57.6Kbps or 115Kbps
+                 *  respectively.
+                 */
+
+                /* 1,2,3,4 => 57.6, 115.2, 230, 460 kbps resp. */
+                if (baud < 1 || baud > 4)
+                        tty->termios->c_cflag &= ~CBAUDEX;
+                else
+                        baud += 15;
+        }
+        if (baud == 15) {
+
+                /*  the ASYNC_SPD_HI and ASYNC_SPD_VHI options are set
+                 *  by the set_serial_info ioctl ... this is done by
+                 *  the 'setserial' utility.
+                 */
+
+                if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+                        baud++; /*  57.6 Kbps */
+                if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+                        baud += 2; /*  115  Kbps */
+                if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+                        baud += 3; /* 230 kbps*/
+                if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+                        baud += 4; /* 460 kbps*/
+        }
+        if (linuxb_to_isib[baud] == -1) {
+                /* hang up */
+                drop_dtr(port);
+                return;
+        } else
+                raise_dtr(port);
+
+        if (WaitTillCardIsFree(base) == 0) {
+                outw(0x8000 | (channel << shift_count) | 0x03, base);
+                outw(linuxb_to_isib[baud] << 8 | 0x03, base);
+                channel_setup = 0;
+                switch (C_CSIZE(tty)) {
+                case CS5:
+                        channel_setup |= ISICOM_CS5;
+                        break;
+                case CS6:
+                        channel_setup |= ISICOM_CS6;
+                        break;
+                case CS7:
+                        channel_setup |= ISICOM_CS7;
+                        break;
+                case CS8:
+                        channel_setup |= ISICOM_CS8;
+                        break;
+                }
+
+                if (C_CSTOPB(tty))
+                        channel_setup |= ISICOM_2SB;
+                if (C_PARENB(tty)) {
+                        channel_setup |= ISICOM_EVPAR;
+                        if (C_PARODD(tty))
+                                channel_setup |= ISICOM_ODPAR;
+                }
+                outw(channel_setup, base);
+                InterruptTheCard(base);
+        }
+        if (C_CLOCAL(tty))
+                port->port.flags &= ~ASYNC_CHECK_CD;
+        else
+                port->port.flags |= ASYNC_CHECK_CD;
+
+        /* flow control settings ...*/
+        flow_ctrl = 0;
+        port->port.flags &= ~ASYNC_CTS_FLOW;
+        if (C_CRTSCTS(tty)) {
+                port->port.flags |= ASYNC_CTS_FLOW;
+                flow_ctrl |= ISICOM_CTSRTS;
+        }
+        if (I_IXON(tty))
+                flow_ctrl |= ISICOM_RESPOND_XONXOFF;
+        if (I_IXOFF(tty))
+                flow_ctrl |= ISICOM_INITIATE_XONXOFF;
+
+        if (WaitTillCardIsFree(base) == 0) {
+                outw(0x8000 | (channel << shift_count) | 0x04, base);
+                outw(flow_ctrl << 8 | 0x05, base);
+                outw((STOP_CHAR(tty)) << 8 | (START_CHAR(tty)), base);
+                InterruptTheCard(base);
+        }
+
+        /*      rx enabled -> enable port for rx on the card    */
+        if (C_CREAD(tty)) {
+                card->port_status |= (1 << channel);
+                outw(card->port_status, base + 0x02);
+        }
+}
+
+/* open et all */
+
+static inline void isicom_setup_board(struct isi_board *bp)
+{
+        int channel;
+        struct isi_port *port;
+
+        bp->count++;
+        if (!(bp->status & BOARD_INIT)) {
+                port = bp->ports;
+                for (channel = 0; channel < bp->port_count; channel++, port++)
+                        drop_dtr_rts(port);
+        }
+        bp->status |= BOARD_ACTIVE | BOARD_INIT;
+}
+
+/* Activate and thus setup board are protected from races against shutdown
+   by the tty_port mutex */
+
+static int isicom_activate(struct tty_port *tport, struct tty_struct *tty)
+{
+        struct isi_port *port = container_of(tport, struct isi_port, port);
+        struct isi_board *card = port->card;
+        unsigned long flags;
+
+        if (tty_port_alloc_xmit_buf(tport) < 0)
+                return -ENOMEM;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+        isicom_setup_board(card);
+
+        port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+
+        /*      discard any residual data       */
+        if (WaitTillCardIsFree(card->base) == 0) {
+                outw(0x8000 | (port->channel << card->shift_count) | 0x02,
+                                card->base);
+                outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base);
+                InterruptTheCard(card->base);
+        }
+        isicom_config_port(tty);
+        spin_unlock_irqrestore(&card->card_lock, flags);
+
+        return 0;
+}
+
+static int isicom_carrier_raised(struct tty_port *port)
+{
+        struct isi_port *ip = container_of(port, struct isi_port, port);
+        return (ip->status & ISI_DCD)?1 : 0;
+}
+
+static struct tty_port *isicom_find_port(struct tty_struct *tty)
+{
+        struct isi_port *port;
+        struct isi_board *card;
+        unsigned int board;
+        int line = tty->index;
+
+        if (line < 0 || line > PORT_COUNT-1)
+                return NULL;
+        board = BOARD(line);
+        card = &isi_card[board];
+
+        if (!(card->status & FIRMWARE_LOADED))
+                return NULL;
+
+        /*  open on a port greater than the port count for the card !!! */
+        if (line > ((board * 16) + card->port_count - 1))
+                return NULL;
+
+        port = &isi_ports[line];
+        if (isicom_paranoia_check(port, tty->name, "isicom_open"))
+                return NULL;
+
+        return &port->port;
+}
+
+static int isicom_open(struct tty_struct *tty, struct file *filp)
+{
+        struct isi_port *port;
+        struct tty_port *tport;
+
+        tport = isicom_find_port(tty);
+        if (tport == NULL)
+                return -ENODEV;
+        port = container_of(tport, struct isi_port, port);
+
+        tty->driver_data = port;
+        return tty_port_open(tport, tty, filp);
+}
+
+/* close et all */
+
+/* card->lock HAS to be held */
+static void isicom_shutdown_port(struct isi_port *port)
+{
+        struct isi_board *card = port->card;
+
+        if (--card->count < 0) {
+                pr_debug("%s: bad board(0x%lx) count %d.\n",
+                         __func__, card->base, card->count);
+                card->count = 0;
+        }
+        /* last port was closed, shutdown that board too */
+        if (!card->count)
+                card->status &= BOARD_ACTIVE;
+}
+
+static void isicom_flush_buffer(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+        struct isi_board *card = port->card;
+        unsigned long flags;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_flush_buffer"))
+                return;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+        port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+        spin_unlock_irqrestore(&card->card_lock, flags);
+
+        tty_wakeup(tty);
+}
+
+static void isicom_shutdown(struct tty_port *port)
+{
+        struct isi_port *ip = container_of(port, struct isi_port, port);
+        struct isi_board *card = ip->card;
+        unsigned long flags;
+
+        /* indicate to the card that no more data can be received
+           on this port */
+        spin_lock_irqsave(&card->card_lock, flags);
+        card->port_status &= ~(1 << ip->channel);
+        outw(card->port_status, card->base + 0x02);
+        isicom_shutdown_port(ip);
+        spin_unlock_irqrestore(&card->card_lock, flags);
+        tty_port_free_xmit_buf(port);
+}
+
+static void isicom_close(struct tty_struct *tty, struct file *filp)
+{
+        struct isi_port *ip = tty->driver_data;
+        struct tty_port *port;
+
+        if (ip == NULL)
+                return;
+
+        port = &ip->port;
+        if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
+                return;
+        tty_port_close(port, tty, filp);
+}
+
+/* write et all */
+static int isicom_write(struct tty_struct *tty, const unsigned char *buf,
+        int count)
+{
+        struct isi_port *port = tty->driver_data;
+        struct isi_board *card = port->card;
+        unsigned long flags;
+        int cnt, total = 0;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_write"))
+                return 0;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+
+        while (1) {
+                cnt = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt
+                                - 1, SERIAL_XMIT_SIZE - port->xmit_head));
+                if (cnt <= 0)
+                        break;
+
+                memcpy(port->port.xmit_buf + port->xmit_head, buf, cnt);
+                port->xmit_head = (port->xmit_head + cnt) & (SERIAL_XMIT_SIZE
+                        - 1);
+                port->xmit_cnt += cnt;
+                buf += cnt;
+                count -= cnt;
+                total += cnt;
+        }
+        if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped)
+                port->status |= ISI_TXOK;
+        spin_unlock_irqrestore(&card->card_lock, flags);
+        return total;
+}
+
+/* put_char et all */
+static int isicom_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct isi_port *port = tty->driver_data;
+        struct isi_board *card = port->card;
+        unsigned long flags;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_put_char"))
+                return 0;
+
+        spin_lock_irqsave(&card->card_lock, flags);
+        if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
+                spin_unlock_irqrestore(&card->card_lock, flags);
+                return 0;
+        }
+
+        port->port.xmit_buf[port->xmit_head++] = ch;
+        port->xmit_head &= (SERIAL_XMIT_SIZE - 1);
+        port->xmit_cnt++;
+        spin_unlock_irqrestore(&card->card_lock, flags);
+        return 1;
+}
+
+/* flush_chars et all */
+static void isicom_flush_chars(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_flush_chars"))
+                return;
+
+        if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+                        !port->port.xmit_buf)
+                return;
+
+        /* this tells the transmitter to consider this port for
+           data output to the card ... that's the best we can do. */
+        port->status |= ISI_TXOK;
+}
+
+/* write_room et all */
+static int isicom_write_room(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+        int free;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_write_room"))
+                return 0;
+
+        free = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
+        if (free < 0)
+                free = 0;
+        return free;
+}
+
+/* chars_in_buffer et all */
+static int isicom_chars_in_buffer(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+        if (isicom_paranoia_check(port, tty->name, "isicom_chars_in_buffer"))
+                return 0;
+        return port->xmit_cnt;
+}
+
+/* ioctl et all */
+static int isicom_send_break(struct tty_struct *tty, int length)
+{
+        struct isi_port *port = tty->driver_data;
+        struct isi_board *card = port->card;
+        unsigned long base = card->base;
+
+        if (length == -1)
+                return -EOPNOTSUPP;
+
+        if (!lock_card(card))
+                return -EINVAL;
+
+        outw(0x8000 | ((port->channel) << (card->shift_count)) | 0x3, base);
+        outw((length & 0xff) << 8 | 0x00, base);
+        outw((length & 0xff00), base);
+        InterruptTheCard(base);
+
+        unlock_card(card);
+        return 0;
+}
+
+static int isicom_tiocmget(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+        /* just send the port status */
+        u16 status = port->status;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+                return -ENODEV;
+
+        return  ((status & ISI_RTS) ? TIOCM_RTS : 0) |
+                ((status & ISI_DTR) ? TIOCM_DTR : 0) |
+                ((status & ISI_DCD) ? TIOCM_CAR : 0) |
+                ((status & ISI_DSR) ? TIOCM_DSR : 0) |
+                ((status & ISI_CTS) ? TIOCM_CTS : 0) |
+                ((status & ISI_RI ) ? TIOCM_RI  : 0);
+}
+
+static int isicom_tiocmset(struct tty_struct *tty,
+                                        unsigned int set, unsigned int clear)
+{
+        struct isi_port *port = tty->driver_data;
+        unsigned long flags;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+                return -ENODEV;
+
+        spin_lock_irqsave(&port->card->card_lock, flags);
+        if (set & TIOCM_RTS)
+                raise_rts(port);
+        if (set & TIOCM_DTR)
+                raise_dtr(port);
+
+        if (clear & TIOCM_RTS)
+                drop_rts(port);
+        if (clear & TIOCM_DTR)
+                drop_dtr(port);
+        spin_unlock_irqrestore(&port->card->card_lock, flags);
+
+        return 0;
+}
+
+static int isicom_set_serial_info(struct tty_struct *tty,
+                                        struct serial_struct __user *info)
+{
+        struct isi_port *port = tty->driver_data;
+        struct serial_struct newinfo;
+        int reconfig_port;
+
+        if (copy_from_user(&newinfo, info, sizeof(newinfo)))
+                return -EFAULT;
+
+        mutex_lock(&port->port.mutex);
+        reconfig_port = ((port->port.flags & ASYNC_SPD_MASK) !=
+                (newinfo.flags & ASYNC_SPD_MASK));
+
+        if (!capable(CAP_SYS_ADMIN)) {
+                if ((newinfo.close_delay != port->port.close_delay) ||
+                                (newinfo.closing_wait != port->port.closing_wait) ||
+                                ((newinfo.flags & ~ASYNC_USR_MASK) !=
+                                (port->port.flags & ~ASYNC_USR_MASK))) {
+                        mutex_unlock(&port->port.mutex);
+                        return -EPERM;
+                }
+                port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
+                                (newinfo.flags & ASYNC_USR_MASK));
+        } else {
+                port->port.close_delay = newinfo.close_delay;
+                port->port.closing_wait = newinfo.closing_wait;
+                port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
+                                (newinfo.flags & ASYNC_FLAGS));
+        }
+        if (reconfig_port) {
+                unsigned long flags;
+                spin_lock_irqsave(&port->card->card_lock, flags);
+                isicom_config_port(tty);
+                spin_unlock_irqrestore(&port->card->card_lock, flags);
+        }
+        mutex_unlock(&port->port.mutex);
+        return 0;
+}
+
+static int isicom_get_serial_info(struct isi_port *port,
+        struct serial_struct __user *info)
+{
+        struct serial_struct out_info;
+
+        mutex_lock(&port->port.mutex);
+        memset(&out_info, 0, sizeof(out_info));
+/*      out_info.type = ? */
+        out_info.line = port - isi_ports;
+        out_info.port = port->card->base;
+        out_info.irq = port->card->irq;
+        out_info.flags = port->port.flags;
+/*      out_info.baud_base = ? */
+        out_info.close_delay = port->port.close_delay;
+        out_info.closing_wait = port->port.closing_wait;
+        mutex_unlock(&port->port.mutex);
+        if (copy_to_user(info, &out_info, sizeof(out_info)))
+                return -EFAULT;
+        return 0;
+}
+
+static int isicom_ioctl(struct tty_struct *tty,
+        unsigned int cmd, unsigned long arg)
+{
+        struct isi_port *port = tty->driver_data;
+        void __user *argp = (void __user *)arg;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_ioctl"))
+                return -ENODEV;
+
+        switch (cmd) {
+        case TIOCGSERIAL:
+                return isicom_get_serial_info(port, argp);
+
+        case TIOCSSERIAL:
+                return isicom_set_serial_info(tty, argp);
+
+        default:
+                return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+/* set_termios et all */
+static void isicom_set_termios(struct tty_struct *tty,
+        struct ktermios *old_termios)
+{
+        struct isi_port *port = tty->driver_data;
+        unsigned long flags;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_set_termios"))
+                return;
+
+        if (tty->termios->c_cflag == old_termios->c_cflag &&
+                        tty->termios->c_iflag == old_termios->c_iflag)
+                return;
+
+        spin_lock_irqsave(&port->card->card_lock, flags);
+        isicom_config_port(tty);
+        spin_unlock_irqrestore(&port->card->card_lock, flags);
+
+        if ((old_termios->c_cflag & CRTSCTS) &&
+                        !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                isicom_start(tty);
+        }
+}
+
+/* throttle et all */
+static void isicom_throttle(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+        struct isi_board *card = port->card;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_throttle"))
+                return;
+
+        /* tell the card that this port cannot handle any more data for now */
+        card->port_status &= ~(1 << port->channel);
+        outw(card->port_status, card->base + 0x02);
+}
+
+/* unthrottle et all */
+static void isicom_unthrottle(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+        struct isi_board *card = port->card;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_unthrottle"))
+                return;
+
+        /* tell the card that this port is ready to accept more data */
+        card->port_status |= (1 << port->channel);
+        outw(card->port_status, card->base + 0x02);
+}
+
+/* stop et all */
+static void isicom_stop(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_stop"))
+                return;
+
+        /* this tells the transmitter not to consider this port for
+           data output to the card. */
+        port->status &= ~ISI_TXOK;
+}
+
+/* start et all */
+static void isicom_start(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_start"))
+                return;
+
+        /* this tells the transmitter to consider this port for
+           data output to the card. */
+        port->status |= ISI_TXOK;
+}
+
+static void isicom_hangup(struct tty_struct *tty)
+{
+        struct isi_port *port = tty->driver_data;
+
+        if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
+                return;
+        tty_port_hangup(&port->port);
+}
+
+
+/*
+ * Driver init and deinit functions
+ */
+
+static const struct tty_operations isicom_ops = {
+        .open                   = isicom_open,
+        .close                  = isicom_close,
+        .write                  = isicom_write,
+        .put_char               = isicom_put_char,
+        .flush_chars            = isicom_flush_chars,
+        .write_room             = isicom_write_room,
+        .chars_in_buffer        = isicom_chars_in_buffer,
+        .ioctl                  = isicom_ioctl,
+        .set_termios            = isicom_set_termios,
+        .throttle               = isicom_throttle,
+        .unthrottle             = isicom_unthrottle,
+        .stop                   = isicom_stop,
+        .start                  = isicom_start,
+        .hangup                 = isicom_hangup,
+        .flush_buffer           = isicom_flush_buffer,
+        .tiocmget               = isicom_tiocmget,
+        .tiocmset               = isicom_tiocmset,
+        .break_ctl              = isicom_send_break,
+};
+
+static const struct tty_port_operations isicom_port_ops = {
+        .carrier_raised         = isicom_carrier_raised,
+        .dtr_rts                = isicom_dtr_rts,
+        .activate               = isicom_activate,
+        .shutdown               = isicom_shutdown,
+};
+
+static int __devinit reset_card(struct pci_dev *pdev,
+        const unsigned int card, unsigned int *signature)
+{
+        struct isi_board *board = pci_get_drvdata(pdev);
+        unsigned long base = board->base;
+        unsigned int sig, portcount = 0;
+        int retval = 0;
+
+        dev_dbg(&pdev->dev, "ISILoad:Resetting Card%d at 0x%lx\n", card + 1,
+                base);
+
+        inw(base + 0x8);
+
+        msleep(10);
+
+        outw(0, base + 0x8); /* Reset */
+
+        msleep(1000);
+
+        sig = inw(base + 0x4) & 0xff;
+
+        if (sig != 0xa5 && sig != 0xbb && sig != 0xcc && sig != 0xdd &&
+                        sig != 0xee) {
+                dev_warn(&pdev->dev, "ISILoad:Card%u reset failure (Possible "
+                        "bad I/O Port Address 0x%lx).\n", card + 1, base);
+                dev_dbg(&pdev->dev, "Sig=0x%x\n", sig);
+                retval = -EIO;
+                goto end;
+        }
+
+        msleep(10);
+
+        portcount = inw(base + 0x2);
+        if (!(inw(base + 0xe) & 0x1) || (portcount != 0 && portcount != 4 &&
+                                portcount != 8 && portcount != 16)) {
+                dev_err(&pdev->dev, "ISILoad:PCI Card%d reset failure.\n",
+                        card + 1);
+                retval = -EIO;
+                goto end;
+        }
+
+        switch (sig) {
+        case 0xa5:
+        case 0xbb:
+        case 0xdd:
+                board->port_count = (portcount == 4) ? 4 : 8;
+                board->shift_count = 12;
+                break;
+        case 0xcc:
+        case 0xee:
+                board->port_count = 16;
+                board->shift_count = 11;
+                break;
+        }
+        dev_info(&pdev->dev, "-Done\n");
+        *signature = sig;
+
+end:
+        return retval;
+}
+
+static int __devinit load_firmware(struct pci_dev *pdev,
+        const unsigned int index, const unsigned int signature)
+{
+        struct isi_board *board = pci_get_drvdata(pdev);
+        const struct firmware *fw;
+        unsigned long base = board->base;
+        unsigned int a;
+        u16 word_count, status;
+        int retval = -EIO;
+        char *name;
+        u8 *data;
+
+        struct stframe {
+                u16     addr;
+                u16     count;
+                u8      data[0];
+        } *frame;
+
+        switch (signature) {
+        case 0xa5:
+                name = "isi608.bin";
+                break;
+        case 0xbb:
+                name = "isi608em.bin";
+                break;
+        case 0xcc:
+                name = "isi616em.bin";
+                break;
+        case 0xdd:
+                name = "isi4608.bin";
+                break;
+        case 0xee:
+                name = "isi4616.bin";
+                break;
+        default:
+                dev_err(&pdev->dev, "Unknown signature.\n");
+                goto end;
+        }
+
+        retval = request_firmware(&fw, name, &pdev->dev);
+        if (retval)
+                goto end;
+
+        retval = -EIO;
+
+        for (frame = (struct stframe *)fw->data;
+                        frame < (struct stframe *)(fw->data + fw->size);
+                        frame = (struct stframe *)((u8 *)(frame + 1) +
+                                frame->count)) {
+                if (WaitTillCardIsFree(base))
+                        goto errrelfw;
+
+                outw(0xf0, base);       /* start upload sequence */
+                outw(0x00, base);
+                outw(frame->addr, base); /* lsb of address */
+
+                word_count = frame->count / 2 + frame->count % 2;
+                outw(word_count, base);
+                InterruptTheCard(base);
+
+                udelay(100); /* 0x2f */
+
+                if (WaitTillCardIsFree(base))
+                        goto errrelfw;
+
+                status = inw(base + 0x4);
+                if (status != 0) {
+                        dev_warn(&pdev->dev, "Card%d rejected load header:\n"
+                                 "Address:0x%x\n"
+                                 "Count:0x%x\n"
+                                 "Status:0x%x\n",
+                                 index + 1, frame->addr, frame->count, status);
+                        goto errrelfw;
+                }
+                outsw(base, frame->data, word_count);
+
+                InterruptTheCard(base);
+
+                udelay(50); /* 0x0f */
+
+                if (WaitTillCardIsFree(base))
+                        goto errrelfw;
+
+                status = inw(base + 0x4);
+                if (status != 0) {
+                        dev_err(&pdev->dev, "Card%d got out of sync.Card "
+                                "Status:0x%x\n", index + 1, status);
+                        goto errrelfw;
+                }
+        }
+
+/* XXX: should we test it by reading it back and comparing with original like
+ * in load firmware package? */
+        for (frame = (struct stframe *)fw->data;
+                        frame < (struct stframe *)(fw->data + fw->size);
+                        frame = (struct stframe *)((u8 *)(frame + 1) +
+                                frame->count)) {
+                if (WaitTillCardIsFree(base))
+                        goto errrelfw;
+
+                outw(0xf1, base); /* start download sequence */
+                outw(0x00, base);
+                outw(frame->addr, base); /* lsb of address */
+
+                word_count = (frame->count >> 1) + frame->count % 2;
+                outw(word_count + 1, base);
+                InterruptTheCard(base);
+
+                udelay(50); /* 0xf */
+
+                if (WaitTillCardIsFree(base))
+                        goto errrelfw;
+
+                status = inw(base + 0x4);
+                if (status != 0) {
+                        dev_warn(&pdev->dev, "Card%d rejected verify header:\n"
+                                 "Address:0x%x\n"
+                                 "Count:0x%x\n"
+                                 "Status: 0x%x\n",
+                                 index + 1, frame->addr, frame->count, status);
+                        goto errrelfw;
+                }
+
+                data = kmalloc(word_count * 2, GFP_KERNEL);
+                if (data == NULL) {
+                        dev_err(&pdev->dev, "Card%d, firmware upload "
+                                "failed, not enough memory\n", index + 1);
+                        goto errrelfw;
+                }
+                inw(base);
+                insw(base, data, word_count);
+                InterruptTheCard(base);
+
+                for (a = 0; a < frame->count; a++)
+                        if (data[a] != frame->data[a]) {
+                                kfree(data);
+                                dev_err(&pdev->dev, "Card%d, firmware upload "
+                                        "failed\n", index + 1);
+                                goto errrelfw;
+                        }
+                kfree(data);
+
+                udelay(50); /* 0xf */
+
+                if (WaitTillCardIsFree(base))
+                        goto errrelfw;
+
+                status = inw(base + 0x4);
+                if (status != 0) {
+                        dev_err(&pdev->dev, "Card%d verify got out of sync. "
+                                "Card Status:0x%x\n", index + 1, status);
+                        goto errrelfw;
+                }
+        }
+
+        /* xfer ctrl */
+        if (WaitTillCardIsFree(base))
+                goto errrelfw;
+
+        outw(0xf2, base);
+        outw(0x800, base);
+        outw(0x0, base);
+        outw(0x0, base);
+        InterruptTheCard(base);
+        outw(0x0, base + 0x4); /* for ISI4608 cards */
+
+        board->status |= FIRMWARE_LOADED;
+        retval = 0;
+
+errrelfw:
+        release_firmware(fw);
+end:
+        return retval;
+}
+
+/*
+ *      Insmod can set static symbols so keep these static
+ */
+static unsigned int card_count;
+
+static int __devinit isicom_probe(struct pci_dev *pdev,
+        const struct pci_device_id *ent)
+{
+        unsigned int uninitialized_var(signature), index;
+        int retval = -EPERM;
+        struct isi_board *board = NULL;
+
+        if (card_count >= BOARD_COUNT)
+                goto err;
+
+        retval = pci_enable_device(pdev);
+        if (retval) {
+                dev_err(&pdev->dev, "failed to enable\n");
+                goto err;
+        }
+
+        dev_info(&pdev->dev, "ISI PCI Card(Device ID 0x%x)\n", ent->device);
+
+        /* allot the first empty slot in the array */
+        for (index = 0; index < BOARD_COUNT; index++) {
+                if (isi_card[index].base == 0) {
+                        board = &isi_card[index];
+                        break;
+                }
+        }
+        if (index == BOARD_COUNT) {
+                retval = -ENODEV;
+                goto err_disable;
+        }
+
+        board->index = index;
+        board->base = pci_resource_start(pdev, 3);
+        board->irq = pdev->irq;
+        card_count++;
+
+        pci_set_drvdata(pdev, board);
+
+        retval = pci_request_region(pdev, 3, ISICOM_NAME);
+        if (retval) {
+                dev_err(&pdev->dev, "I/O Region 0x%lx-0x%lx is busy. Card%d "
+                        "will be disabled.\n", board->base, board->base + 15,
+                        index + 1);
+                retval = -EBUSY;
+                goto errdec;
+        }
+
+        retval = request_irq(board->irq, isicom_interrupt,
+                        IRQF_SHARED | IRQF_DISABLED, ISICOM_NAME, board);
+        if (retval < 0) {
+                dev_err(&pdev->dev, "Could not install handler at Irq %d. "
+                        "Card%d will be disabled.\n", board->irq, index + 1);
+                goto errunrr;
+        }
+
+        retval = reset_card(pdev, index, &signature);
+        if (retval < 0)
+                goto errunri;
+
+        retval = load_firmware(pdev, index, signature);
+        if (retval < 0)
+                goto errunri;
+
+        for (index = 0; index < board->port_count; index++)
+                tty_register_device(isicom_normal, board->index * 16 + index,
+                                &pdev->dev);
+
+        return 0;
+
+errunri:
+        free_irq(board->irq, board);
+errunrr:
+        pci_release_region(pdev, 3);
+errdec:
+        board->base = 0;
+        card_count--;
+err_disable:
+        pci_disable_device(pdev);
+err:
+        return retval;
+}
+
+static void __devexit isicom_remove(struct pci_dev *pdev)
+{
+        struct isi_board *board = pci_get_drvdata(pdev);
+        unsigned int i;
+
+        for (i = 0; i < board->port_count; i++)
+                tty_unregister_device(isicom_normal, board->index * 16 + i);
+
+        free_irq(board->irq, board);
+        pci_release_region(pdev, 3);
+        board->base = 0;
+        card_count--;
+        pci_disable_device(pdev);
+}
+
+static int __init isicom_init(void)
+{
+        int retval, idx, channel;
+        struct isi_port *port;
+
+        for (idx = 0; idx < BOARD_COUNT; idx++) {
+                port = &isi_ports[idx * 16];
+                isi_card[idx].ports = port;
+                spin_lock_init(&isi_card[idx].card_lock);
+                for (channel = 0; channel < 16; channel++, port++) {
+                        tty_port_init(&port->port);
+                        port->port.ops = &isicom_port_ops;
+                        port->magic = ISICOM_MAGIC;
+                        port->card = &isi_card[idx];
+                        port->channel = channel;
+                        port->port.close_delay = 50 * HZ/100;
+                        port->port.closing_wait = 3000 * HZ/100;
+                        port->status = 0;
+                        /*  . . .  */
+                }
+                isi_card[idx].base = 0;
+                isi_card[idx].irq = 0;
+        }
+
+        /* tty driver structure initialization */
+        isicom_normal = alloc_tty_driver(PORT_COUNT);
+        if (!isicom_normal) {
+                retval = -ENOMEM;
+                goto error;
+        }
+
+        isicom_normal->owner                    = THIS_MODULE;
+        isicom_normal->name                     = "ttyM";
+        isicom_normal->major                    = ISICOM_NMAJOR;
+        isicom_normal->minor_start              = 0;
+        isicom_normal->type                     = TTY_DRIVER_TYPE_SERIAL;
+        isicom_normal->subtype                  = SERIAL_TYPE_NORMAL;
+        isicom_normal->init_termios             = tty_std_termios;
+        isicom_normal->init_termios.c_cflag     = B9600 | CS8 | CREAD | HUPCL |
+                CLOCAL;
+        isicom_normal->flags                    = TTY_DRIVER_REAL_RAW |
+                TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_HARDWARE_BREAK;
+        tty_set_operations(isicom_normal, &isicom_ops);
+
+        retval = tty_register_driver(isicom_normal);
+        if (retval) {
+                pr_debug("Couldn't register the dialin driver\n");
+                goto err_puttty;
+        }
+
+        retval = pci_register_driver(&isicom_driver);
+        if (retval < 0) {
+                pr_err("Unable to register pci driver.\n");
+                goto err_unrtty;
+        }
+
+        mod_timer(&tx, jiffies + 1);
+
+        return 0;
+err_unrtty:
+        tty_unregister_driver(isicom_normal);
+err_puttty:
+        put_tty_driver(isicom_normal);
+error:
+        return retval;
+}
+
+static void __exit isicom_exit(void)
+{
+        del_timer_sync(&tx);
+
+        pci_unregister_driver(&isicom_driver);
+        tty_unregister_driver(isicom_normal);
+        put_tty_driver(isicom_normal);
+}
+
+module_init(isicom_init);
+module_exit(isicom_exit);
+
+MODULE_AUTHOR("MultiTech");
+MODULE_DESCRIPTION("Driver for the ISI series of cards by MultiTech");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("isi608.bin");
+MODULE_FIRMWARE("isi608em.bin");
+MODULE_FIRMWARE("isi616em.bin");
+MODULE_FIRMWARE("isi4608.bin");
+MODULE_FIRMWARE("isi4616.bin");
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c
new file mode 100644
index 000000000000..ba679ce0a774
--- /dev/null
+++ b/drivers/tty/moxa.c
@@ -0,0 +1,2084 @@
+/*****************************************************************************/
+/*
+ *           moxa.c  -- MOXA Intellio family multiport serial driver.
+ *
+ *      Copyright (C) 1999-2000  Moxa Technologies (support@moxa.com).
+ *      Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
+ *
+ *      This code is loosely based on the Linux serial driver, written by
+ *      Linus Torvalds, Theodore T'so and others.
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ */
+
+/*
+ *    MOXA Intellio Series Driver
+ *      for             : LINUX
+ *      date            : 1999/1/7
+ *      version         : 5.1
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/firmware.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/serial.h>
+#include <linux/tty_driver.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include "moxa.h"
+
+#define MOXA_VERSION            "6.0k"
+
+#define MOXA_FW_HDRLEN          32
+
+#define MOXAMAJOR               172
+
+#define MAX_BOARDS              4       /* Don't change this value */
+#define MAX_PORTS_PER_BOARD     32      /* Don't change this value */
+#define MAX_PORTS               (MAX_BOARDS * MAX_PORTS_PER_BOARD)
+
+#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
+                (brd)->boardType == MOXA_BOARD_C320_PCI)
+
+/*
+ *    Define the Moxa PCI vendor and device IDs.
+ */
+#define MOXA_BUS_TYPE_ISA       0
+#define MOXA_BUS_TYPE_PCI       1
+
+enum {
+        MOXA_BOARD_C218_PCI = 1,
+        MOXA_BOARD_C218_ISA,
+        MOXA_BOARD_C320_PCI,
+        MOXA_BOARD_C320_ISA,
+        MOXA_BOARD_CP204J,
+};
+
+static char *moxa_brdname[] =
+{
+        "C218 Turbo PCI series",
+        "C218 Turbo ISA series",
+        "C320 Turbo PCI series",
+        "C320 Turbo ISA series",
+        "CP-204J series",
+};
+
+#ifdef CONFIG_PCI
+static struct pci_device_id moxa_pcibrds[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
+                .driver_data = MOXA_BOARD_C218_PCI },
+        { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
+                .driver_data = MOXA_BOARD_C320_PCI },
+        { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
+                .driver_data = MOXA_BOARD_CP204J },
+        { 0 }
+};
+MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
+#endif /* CONFIG_PCI */
+
+struct moxa_port;
+
+static struct moxa_board_conf {
+        int boardType;
+        int numPorts;
+        int busType;
+
+        unsigned int ready;
+
+        struct moxa_port *ports;
+
+        void __iomem *basemem;
+        void __iomem *intNdx;
+        void __iomem *intPend;
+        void __iomem *intTable;
+} moxa_boards[MAX_BOARDS];
+
+struct mxser_mstatus {
+        tcflag_t cflag;
+        int cts;
+        int dsr;
+        int ri;
+        int dcd;
+};
+
+struct moxaq_str {
+        int inq;
+        int outq;
+};
+
+struct moxa_port {
+        struct tty_port port;
+        struct moxa_board_conf *board;
+        void __iomem *tableAddr;
+
+        int type;
+        int cflag;
+        unsigned long statusflags;
+
+        u8 DCDState;            /* Protected by the port lock */
+        u8 lineCtrl;
+        u8 lowChkFlag;
+};
+
+struct mon_str {
+        int tick;
+        int rxcnt[MAX_PORTS];
+        int txcnt[MAX_PORTS];
+};
+
+/* statusflags */
+#define TXSTOPPED       1
+#define LOWWAIT         2
+#define EMPTYWAIT       3
+
+#define SERIAL_DO_RESTART
+
+#define WAKEUP_CHARS            256
+
+static int ttymajor = MOXAMAJOR;
+static struct mon_str moxaLog;
+static unsigned int moxaFuncTout = HZ / 2;
+static unsigned int moxaLowWaterChk;
+static DEFINE_MUTEX(moxa_openlock);
+static DEFINE_SPINLOCK(moxa_lock);
+
+static unsigned long baseaddr[MAX_BOARDS];
+static unsigned int type[MAX_BOARDS];
+static unsigned int numports[MAX_BOARDS];
+
+MODULE_AUTHOR("William Chen");
+MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("c218tunx.cod");
+MODULE_FIRMWARE("cp204unx.cod");
+MODULE_FIRMWARE("c320tunx.cod");
+
+module_param_array(type, uint, NULL, 0);
+MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
+module_param_array(baseaddr, ulong, NULL, 0);
+MODULE_PARM_DESC(baseaddr, "base address");
+module_param_array(numports, uint, NULL, 0);
+MODULE_PARM_DESC(numports, "numports (ignored for C218)");
+
+module_param(ttymajor, int, 0);
+
+/*
+ * static functions:
+ */
+static int moxa_open(struct tty_struct *, struct file *);
+static void moxa_close(struct tty_struct *, struct file *);
+static int moxa_write(struct tty_struct *, const unsigned char *, int);
+static int moxa_write_room(struct tty_struct *);
+static void moxa_flush_buffer(struct tty_struct *);
+static int moxa_chars_in_buffer(struct tty_struct *);
+static void moxa_set_termios(struct tty_struct *, struct ktermios *);
+static void moxa_stop(struct tty_struct *);
+static void moxa_start(struct tty_struct *);
+static void moxa_hangup(struct tty_struct *);
+static int moxa_tiocmget(struct tty_struct *tty);
+static int moxa_tiocmset(struct tty_struct *tty,
+                         unsigned int set, unsigned int clear);
+static void moxa_poll(unsigned long);
+static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
+static void moxa_shutdown(struct tty_port *);
+static int moxa_carrier_raised(struct tty_port *);
+static void moxa_dtr_rts(struct tty_port *, int);
+/*
+ * moxa board interface functions:
+ */
+static void MoxaPortEnable(struct moxa_port *);
+static void MoxaPortDisable(struct moxa_port *);
+static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
+static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
+static void MoxaPortLineCtrl(struct moxa_port *, int, int);
+static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
+static int MoxaPortLineStatus(struct moxa_port *);
+static void MoxaPortFlushData(struct moxa_port *, int);
+static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
+static int MoxaPortReadData(struct moxa_port *);
+static int MoxaPortTxQueue(struct moxa_port *);
+static int MoxaPortRxQueue(struct moxa_port *);
+static int MoxaPortTxFree(struct moxa_port *);
+static void MoxaPortTxDisable(struct moxa_port *);
+static void MoxaPortTxEnable(struct moxa_port *);
+static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
+static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
+static void MoxaSetFifo(struct moxa_port *port, int enable);
+
+/*
+ * I/O functions
+ */
+
+static DEFINE_SPINLOCK(moxafunc_lock);
+
+static void moxa_wait_finish(void __iomem *ofsAddr)
+{
+        unsigned long end = jiffies + moxaFuncTout;
+
+        while (readw(ofsAddr + FuncCode) != 0)
+                if (time_after(jiffies, end))
+                        return;
+        if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit())
+                printk(KERN_WARNING "moxa function expired\n");
+}
+
+static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&moxafunc_lock, flags);
+        writew(arg, ofsAddr + FuncArg);
+        writew(cmd, ofsAddr + FuncCode);
+        moxa_wait_finish(ofsAddr);
+        spin_unlock_irqrestore(&moxafunc_lock, flags);
+}
+
+static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
+{
+        unsigned long flags;
+        u16 ret;
+        spin_lock_irqsave(&moxafunc_lock, flags);
+        writew(arg, ofsAddr + FuncArg);
+        writew(cmd, ofsAddr + FuncCode);
+        moxa_wait_finish(ofsAddr);
+        ret = readw(ofsAddr + FuncArg);
+        spin_unlock_irqrestore(&moxafunc_lock, flags);
+        return ret;
+}
+
+static void moxa_low_water_check(void __iomem *ofsAddr)
+{
+        u16 rptr, wptr, mask, len;
+
+        if (readb(ofsAddr + FlagStat) & Xoff_state) {
+                rptr = readw(ofsAddr + RXrptr);
+                wptr = readw(ofsAddr + RXwptr);
+                mask = readw(ofsAddr + RX_mask);
+                len = (wptr - rptr) & mask;
+                if (len <= Low_water)
+                        moxafunc(ofsAddr, FC_SendXon, 0);
+        }
+}
+
+/*
+ * TTY operations
+ */
+
+static int moxa_ioctl(struct tty_struct *tty,
+                      unsigned int cmd, unsigned long arg)
+{
+        struct moxa_port *ch = tty->driver_data;
+        void __user *argp = (void __user *)arg;
+        int status, ret = 0;
+
+        if (tty->index == MAX_PORTS) {
+                if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
+                                cmd != MOXA_GETMSTATUS)
+                        return -EINVAL;
+        } else if (!ch)
+                return -ENODEV;
+
+        switch (cmd) {
+        case MOXA_GETDATACOUNT:
+                moxaLog.tick = jiffies;
+                if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
+                        ret = -EFAULT;
+                break;
+        case MOXA_FLUSH_QUEUE:
+                MoxaPortFlushData(ch, arg);
+                break;
+        case MOXA_GET_IOQUEUE: {
+                struct moxaq_str __user *argm = argp;
+                struct moxaq_str tmp;
+                struct moxa_port *p;
+                unsigned int i, j;
+
+                for (i = 0; i < MAX_BOARDS; i++) {
+                        p = moxa_boards[i].ports;
+                        for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
+                                memset(&tmp, 0, sizeof(tmp));
+                                spin_lock_bh(&moxa_lock);
+                                if (moxa_boards[i].ready) {
+                                        tmp.inq = MoxaPortRxQueue(p);
+                                        tmp.outq = MoxaPortTxQueue(p);
+                                }
+                                spin_unlock_bh(&moxa_lock);
+                                if (copy_to_user(argm, &tmp, sizeof(tmp)))
+                                        return -EFAULT;
+                        }
+                }
+                break;
+        } case MOXA_GET_OQUEUE:
+                status = MoxaPortTxQueue(ch);
+                ret = put_user(status, (unsigned long __user *)argp);
+                break;
+        case MOXA_GET_IQUEUE:
+                status = MoxaPortRxQueue(ch);
+                ret = put_user(status, (unsigned long __user *)argp);
+                break;
+        case MOXA_GETMSTATUS: {
+                struct mxser_mstatus __user *argm = argp;
+                struct mxser_mstatus tmp;
+                struct moxa_port *p;
+                unsigned int i, j;
+
+                for (i = 0; i < MAX_BOARDS; i++) {
+                        p = moxa_boards[i].ports;
+                        for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
+                                struct tty_struct *ttyp;
+                                memset(&tmp, 0, sizeof(tmp));
+                                spin_lock_bh(&moxa_lock);
+                                if (!moxa_boards[i].ready) {
+                                        spin_unlock_bh(&moxa_lock);
+                                        goto copy;
+                                }
+
+                                status = MoxaPortLineStatus(p);
+                                spin_unlock_bh(&moxa_lock);
+
+                                if (status & 1)
+                                        tmp.cts = 1;
+                                if (status & 2)
+                                        tmp.dsr = 1;
+                                if (status & 4)
+                                        tmp.dcd = 1;
+
+                                ttyp = tty_port_tty_get(&p->port);
+                                if (!ttyp || !ttyp->termios)
+                                        tmp.cflag = p->cflag;
+                                else
+                                        tmp.cflag = ttyp->termios->c_cflag;
+                                tty_kref_put(ttyp);
+copy:
+                                if (copy_to_user(argm, &tmp, sizeof(tmp)))
+                                        return -EFAULT;
+                        }
+                }
+                break;
+        }
+        case TIOCGSERIAL:
+                mutex_lock(&ch->port.mutex);
+                ret = moxa_get_serial_info(ch, argp);
+                mutex_unlock(&ch->port.mutex);
+                break;
+        case TIOCSSERIAL:
+                mutex_lock(&ch->port.mutex);
+                ret = moxa_set_serial_info(ch, argp);
+                mutex_unlock(&ch->port.mutex);
+                break;
+        default:
+                ret = -ENOIOCTLCMD;
+        }
+        return ret;
+}
+
+static int moxa_break_ctl(struct tty_struct *tty, int state)
+{
+        struct moxa_port *port = tty->driver_data;
+
+        moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
+                        Magic_code);
+        return 0;
+}
+
+static const struct tty_operations moxa_ops = {
+        .open = moxa_open,
+        .close = moxa_close,
+        .write = moxa_write,
+        .write_room = moxa_write_room,
+        .flush_buffer = moxa_flush_buffer,
+        .chars_in_buffer = moxa_chars_in_buffer,
+        .ioctl = moxa_ioctl,
+        .set_termios = moxa_set_termios,
+        .stop = moxa_stop,
+        .start = moxa_start,
+        .hangup = moxa_hangup,
+        .break_ctl = moxa_break_ctl,
+        .tiocmget = moxa_tiocmget,
+        .tiocmset = moxa_tiocmset,
+};
+
+static const struct tty_port_operations moxa_port_ops = {
+        .carrier_raised = moxa_carrier_raised,
+        .dtr_rts = moxa_dtr_rts,
+        .shutdown = moxa_shutdown,
+};
+
+static struct tty_driver *moxaDriver;
+static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
+
+/*
+ * HW init
+ */
+
+static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
+{
+        switch (brd->boardType) {
+        case MOXA_BOARD_C218_ISA:
+        case MOXA_BOARD_C218_PCI:
+                if (model != 1)
+                        goto err;
+                break;
+        case MOXA_BOARD_CP204J:
+                if (model != 3)
+                        goto err;
+                break;
+        default:
+                if (model != 2)
+                        goto err;
+                break;
+        }
+        return 0;
+err:
+        return -EINVAL;
+}
+
+static int moxa_check_fw(const void *ptr)
+{
+        const __le16 *lptr = ptr;
+
+        if (*lptr != cpu_to_le16(0x7980))
+                return -EINVAL;
+
+        return 0;
+}
+
+static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
+                size_t len)
+{
+        void __iomem *baseAddr = brd->basemem;
+        u16 tmp;
+
+        writeb(HW_reset, baseAddr + Control_reg);       /* reset */
+        msleep(10);
+        memset_io(baseAddr, 0, 4096);
+        memcpy_toio(baseAddr, buf, len);        /* download BIOS */
+        writeb(0, baseAddr + Control_reg);      /* restart */
+
+        msleep(2000);
+
+        switch (brd->boardType) {
+        case MOXA_BOARD_C218_ISA:
+        case MOXA_BOARD_C218_PCI:
+                tmp = readw(baseAddr + C218_key);
+                if (tmp != C218_KeyCode)
+                        goto err;
+                break;
+        case MOXA_BOARD_CP204J:
+                tmp = readw(baseAddr + C218_key);
+                if (tmp != CP204J_KeyCode)
+                        goto err;
+                break;
+        default:
+                tmp = readw(baseAddr + C320_key);
+                if (tmp != C320_KeyCode)
+                        goto err;
+                tmp = readw(baseAddr + C320_status);
+                if (tmp != STS_init) {
+                        printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
+                                        "module not found\n");
+                        return -EIO;
+                }
+                break;
+        }
+
+        return 0;
+err:
+        printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
+        return -EIO;
+}
+
+static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
+                size_t len)
+{
+        void __iomem *baseAddr = brd->basemem;
+
+        if (len < 7168) {
+                printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
+                return -EINVAL;
+        }
+
+        writew(len - 7168 - 2, baseAddr + C320bapi_len);
+        writeb(1, baseAddr + Control_reg);      /* Select Page 1 */
+        memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
+        writeb(2, baseAddr + Control_reg);      /* Select Page 2 */
+        memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
+
+        return 0;
+}
+
+static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
+                size_t len)
+{
+        void __iomem *baseAddr = brd->basemem;
+        const __le16 *uptr = ptr;
+        size_t wlen, len2, j;
+        unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
+        unsigned int i, retry;
+        u16 usum, keycode;
+
+        keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
+                                C218_KeyCode;
+
+        switch (brd->boardType) {
+        case MOXA_BOARD_CP204J:
+        case MOXA_BOARD_C218_ISA:
+        case MOXA_BOARD_C218_PCI:
+                key = C218_key;
+                loadbuf = C218_LoadBuf;
+                loadlen = C218DLoad_len;
+                checksum = C218check_sum;
+                checksum_ok = C218chksum_ok;
+                break;
+        default:
+                key = C320_key;
+                keycode = C320_KeyCode;
+                loadbuf = C320_LoadBuf;
+                loadlen = C320DLoad_len;
+                checksum = C320check_sum;
+                checksum_ok = C320chksum_ok;
+                break;
+        }
+
+        usum = 0;
+        wlen = len >> 1;
+        for (i = 0; i < wlen; i++)
+                usum += le16_to_cpu(uptr[i]);
+        retry = 0;
+        do {
+                wlen = len >> 1;
+                j = 0;
+                while (wlen) {
+                        len2 = (wlen > 2048) ? 2048 : wlen;
+                        wlen -= len2;
+                        memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
+                        j += len2 << 1;
+
+                        writew(len2, baseAddr + loadlen);
+                        writew(0, baseAddr + key);
+                        for (i = 0; i < 100; i++) {
+                                if (readw(baseAddr + key) == keycode)
+                                        break;
+                                msleep(10);
+                        }
+                        if (readw(baseAddr + key) != keycode)
+                                return -EIO;
+                }
+                writew(0, baseAddr + loadlen);
+                writew(usum, baseAddr + checksum);
+                writew(0, baseAddr + key);
+                for (i = 0; i < 100; i++) {
+                        if (readw(baseAddr + key) == keycode)
+                                break;
+                        msleep(10);
+                }
+                retry++;
+        } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
+        if (readb(baseAddr + checksum_ok) != 1)
+                return -EIO;
+
+        writew(0, baseAddr + key);
+        for (i = 0; i < 600; i++) {
+                if (readw(baseAddr + Magic_no) == Magic_code)
+                        break;
+                msleep(10);
+        }
+        if (readw(baseAddr + Magic_no) != Magic_code)
+                return -EIO;
+
+        if (MOXA_IS_320(brd)) {
+                if (brd->busType == MOXA_BUS_TYPE_PCI) {        /* ASIC board */
+                        writew(0x3800, baseAddr + TMS320_PORT1);
+                        writew(0x3900, baseAddr + TMS320_PORT2);
+                        writew(28499, baseAddr + TMS320_CLOCK);
+                } else {
+                        writew(0x3200, baseAddr + TMS320_PORT1);
+                        writew(0x3400, baseAddr + TMS320_PORT2);
+                        writew(19999, baseAddr + TMS320_CLOCK);
+                }
+        }
+        writew(1, baseAddr + Disable_IRQ);
+        writew(0, baseAddr + Magic_no);
+        for (i = 0; i < 500; i++) {
+                if (readw(baseAddr + Magic_no) == Magic_code)
+                        break;
+                msleep(10);
+        }
+        if (readw(baseAddr + Magic_no) != Magic_code)
+                return -EIO;
+
+        if (MOXA_IS_320(brd)) {
+                j = readw(baseAddr + Module_cnt);
+                if (j <= 0)
+                        return -EIO;
+                brd->numPorts = j * 8;
+                writew(j, baseAddr + Module_no);
+                writew(0, baseAddr + Magic_no);
+                for (i = 0; i < 600; i++) {
+                        if (readw(baseAddr + Magic_no) == Magic_code)
+                                break;
+                        msleep(10);
+                }
+                if (readw(baseAddr + Magic_no) != Magic_code)
+                        return -EIO;
+        }
+        brd->intNdx = baseAddr + IRQindex;
+        brd->intPend = baseAddr + IRQpending;
+        brd->intTable = baseAddr + IRQtable;
+
+        return 0;
+}
+
+static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
+                size_t len)
+{
+        void __iomem *ofsAddr, *baseAddr = brd->basemem;
+        struct moxa_port *port;
+        int retval, i;
+
+        if (len % 2) {
+                printk(KERN_ERR "MOXA: bios length is not even\n");
+                return -EINVAL;
+        }
+
+        retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
+        if (retval)
+                return retval;
+
+        switch (brd->boardType) {
+        case MOXA_BOARD_C218_ISA:
+        case MOXA_BOARD_C218_PCI:
+        case MOXA_BOARD_CP204J:
+                port = brd->ports;
+                for (i = 0; i < brd->numPorts; i++, port++) {
+                        port->board = brd;
+                        port->DCDState = 0;
+                        port->tableAddr = baseAddr + Extern_table +
+                                        Extern_size * i;
+                        ofsAddr = port->tableAddr;
+                        writew(C218rx_mask, ofsAddr + RX_mask);
+                        writew(C218tx_mask, ofsAddr + TX_mask);
+                        writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
+                        writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
+
+                        writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
+                        writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
+
+                }
+                break;
+        default:
+                port = brd->ports;
+                for (i = 0; i < brd->numPorts; i++, port++) {
+                        port->board = brd;
+                        port->DCDState = 0;
+                        port->tableAddr = baseAddr + Extern_table +
+                                        Extern_size * i;
+                        ofsAddr = port->tableAddr;
+                        switch (brd->numPorts) {
+                        case 8:
+                                writew(C320p8rx_mask, ofsAddr + RX_mask);
+                                writew(C320p8tx_mask, ofsAddr + TX_mask);
+                                writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
+                                writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
+                                writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
+                                writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
+
+                                break;
+                        case 16:
+                                writew(C320p16rx_mask, ofsAddr + RX_mask);
+                                writew(C320p16tx_mask, ofsAddr + TX_mask);
+                                writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
+                                writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
+                                writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
+                                writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
+                                break;
+
+                        case 24:
+                                writew(C320p24rx_mask, ofsAddr + RX_mask);
+                                writew(C320p24tx_mask, ofsAddr + TX_mask);
+                                writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
+                                writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
+                                writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
+                                writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
+                                break;
+                        case 32:
+                                writew(C320p32rx_mask, ofsAddr + RX_mask);
+                                writew(C320p32tx_mask, ofsAddr + TX_mask);
+                                writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
+                                writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
+                                writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
+                                writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
+                                writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
+                                break;
+                        }
+                }
+                break;
+        }
+        return 0;
+}
+
+static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
+{
+        const void *ptr = fw->data;
+        char rsn[64];
+        u16 lens[5];
+        size_t len;
+        unsigned int a, lenp, lencnt;
+        int ret = -EINVAL;
+        struct {
+                __le32 magic;   /* 0x34303430 */
+                u8 reserved1[2];
+                u8 type;        /* UNIX = 3 */
+                u8 model;       /* C218T=1, C320T=2, CP204=3 */
+                u8 reserved2[8];
+                __le16 len[5];
+        } const *hdr = ptr;
+
+        BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
+
+        if (fw->size < MOXA_FW_HDRLEN) {
+                strcpy(rsn, "too short (even header won't fit)");
+                goto err;
+        }
+        if (hdr->magic != cpu_to_le32(0x30343034)) {
+                sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
+                goto err;
+        }
+        if (hdr->type != 3) {
+                sprintf(rsn, "not for linux, type is %u", hdr->type);
+                goto err;
+        }
+        if (moxa_check_fw_model(brd, hdr->model)) {
+                sprintf(rsn, "not for this card, model is %u", hdr->model);
+                goto err;
+        }
+
+        len = MOXA_FW_HDRLEN;
+        lencnt = hdr->model == 2 ? 5 : 3;
+        for (a = 0; a < ARRAY_SIZE(lens); a++) {
+                lens[a] = le16_to_cpu(hdr->len[a]);
+                if (lens[a] && len + lens[a] <= fw->size &&
+                                moxa_check_fw(&fw->data[len]))
+                        printk(KERN_WARNING "MOXA firmware: unexpected input "
+                                "at offset %u, but going on\n", (u32)len);
+                if (!lens[a] && a < lencnt) {
+                        sprintf(rsn, "too few entries in fw file");
+                        goto err;
+                }
+                len += lens[a];
+        }
+
+        if (len != fw->size) {
+                sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
+                                (u32)len);
+                goto err;
+        }
+
+        ptr += MOXA_FW_HDRLEN;
+        lenp = 0; /* bios */
+
+        strcpy(rsn, "read above");
+
+        ret = moxa_load_bios(brd, ptr, lens[lenp]);
+        if (ret)
+                goto err;
+
+        /* we skip the tty section (lens[1]), since we don't need it */
+        ptr += lens[lenp] + lens[lenp + 1];
+        lenp += 2; /* comm */
+
+        if (hdr->model == 2) {
+                ret = moxa_load_320b(brd, ptr, lens[lenp]);
+                if (ret)
+                        goto err;
+                /* skip another tty */
+                ptr += lens[lenp] + lens[lenp + 1];
+                lenp += 2;
+        }
+
+        ret = moxa_load_code(brd, ptr, lens[lenp]);
+        if (ret)
+                goto err;
+
+        return 0;
+err:
+        printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
+        return ret;
+}
+
+static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
+{
+        const struct firmware *fw;
+        const char *file;
+        struct moxa_port *p;
+        unsigned int i;
+        int ret;
+
+        brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
+                        GFP_KERNEL);
+        if (brd->ports == NULL) {
+                printk(KERN_ERR "cannot allocate memory for ports\n");
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
+                tty_port_init(&p->port);
+                p->port.ops = &moxa_port_ops;
+                p->type = PORT_16550A;
+                p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
+        }
+
+        switch (brd->boardType) {
+        case MOXA_BOARD_C218_ISA:
+        case MOXA_BOARD_C218_PCI:
+                file = "c218tunx.cod";
+                break;
+        case MOXA_BOARD_CP204J:
+                file = "cp204unx.cod";
+                break;
+        default:
+                file = "c320tunx.cod";
+                break;
+        }
+
+        ret = request_firmware(&fw, file, dev);
+        if (ret) {
+                printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
+                                "you've placed '%s' file into your firmware "
+                                "loader directory (e.g. /lib/firmware)\n",
+                                file);
+                goto err_free;
+        }
+
+        ret = moxa_load_fw(brd, fw);
+
+        release_firmware(fw);
+
+        if (ret)
+                goto err_free;
+
+        spin_lock_bh(&moxa_lock);
+        brd->ready = 1;
+        if (!timer_pending(&moxaTimer))
+                mod_timer(&moxaTimer, jiffies + HZ / 50);
+        spin_unlock_bh(&moxa_lock);
+
+        return 0;
+err_free:
+        kfree(brd->ports);
+err:
+        return ret;
+}
+
+static void moxa_board_deinit(struct moxa_board_conf *brd)
+{
+        unsigned int a, opened;
+
+        mutex_lock(&moxa_openlock);
+        spin_lock_bh(&moxa_lock);
+        brd->ready = 0;
+        spin_unlock_bh(&moxa_lock);
+
+        /* pci hot-un-plug support */
+        for (a = 0; a < brd->numPorts; a++)
+                if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
+                        struct tty_struct *tty = tty_port_tty_get(
+                                                &brd->ports[a].port);
+                        if (tty) {
+                                tty_hangup(tty);
+                                tty_kref_put(tty);
+                        }
+                }
+        while (1) {
+                opened = 0;
+                for (a = 0; a < brd->numPorts; a++)
+                        if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
+                                opened++;
+                mutex_unlock(&moxa_openlock);
+                if (!opened)
+                        break;
+                msleep(50);
+                mutex_lock(&moxa_openlock);
+        }
+
+        iounmap(brd->basemem);
+        brd->basemem = NULL;
+        kfree(brd->ports);
+}
+
+#ifdef CONFIG_PCI
+static int __devinit moxa_pci_probe(struct pci_dev *pdev,
+                const struct pci_device_id *ent)
+{
+        struct moxa_board_conf *board;
+        unsigned int i;
+        int board_type = ent->driver_data;
+        int retval;
+
+        retval = pci_enable_device(pdev);
+        if (retval) {
+                dev_err(&pdev->dev, "can't enable pci device\n");
+                goto err;
+        }
+
+        for (i = 0; i < MAX_BOARDS; i++)
+                if (moxa_boards[i].basemem == NULL)
+                        break;
+
+        retval = -ENODEV;
+        if (i >= MAX_BOARDS) {
+                dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
+                                "found. Board is ignored.\n", MAX_BOARDS);
+                goto err;
+        }
+
+        board = &moxa_boards[i];
+
+        retval = pci_request_region(pdev, 2, "moxa-base");
+        if (retval) {
+                dev_err(&pdev->dev, "can't request pci region 2\n");
+                goto err;
+        }
+
+        board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
+        if (board->basemem == NULL) {
+                dev_err(&pdev->dev, "can't remap io space 2\n");
+                goto err_reg;
+        }
+
+        board->boardType = board_type;
+        switch (board_type) {
+        case MOXA_BOARD_C218_ISA:
+        case MOXA_BOARD_C218_PCI:
+                board->numPorts = 8;
+                break;
+
+        case MOXA_BOARD_CP204J:
+                board->numPorts = 4;
+                break;
+        default:
+                board->numPorts = 0;
+                break;
+        }
+        board->busType = MOXA_BUS_TYPE_PCI;
+
+        retval = moxa_init_board(board, &pdev->dev);
+        if (retval)
+                goto err_base;
+
+        pci_set_drvdata(pdev, board);
+
+        dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
+                        moxa_brdname[board_type - 1], board->numPorts);
+
+        return 0;
+err_base:
+        iounmap(board->basemem);
+        board->basemem = NULL;
+err_reg:
+        pci_release_region(pdev, 2);
+err:
+        return retval;
+}
+
+static void __devexit moxa_pci_remove(struct pci_dev *pdev)
+{
+        struct moxa_board_conf *brd = pci_get_drvdata(pdev);
+
+        moxa_board_deinit(brd);
+
+        pci_release_region(pdev, 2);
+}
+
+static struct pci_driver moxa_pci_driver = {
+        .name = "moxa",
+        .id_table = moxa_pcibrds,
+        .probe = moxa_pci_probe,
+        .remove = __devexit_p(moxa_pci_remove)
+};
+#endif /* CONFIG_PCI */
+
+static int __init moxa_init(void)
+{
+        unsigned int isabrds = 0;
+        int retval = 0;
+        struct moxa_board_conf *brd = moxa_boards;
+        unsigned int i;
+
+        printk(KERN_INFO "MOXA Intellio family driver version %s\n",
+                        MOXA_VERSION);
+        moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
+        if (!moxaDriver)
+                return -ENOMEM;
+
+        moxaDriver->owner = THIS_MODULE;
+        moxaDriver->name = "ttyMX";
+        moxaDriver->major = ttymajor;
+        moxaDriver->minor_start = 0;
+        moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
+        moxaDriver->subtype = SERIAL_TYPE_NORMAL;
+        moxaDriver->init_termios = tty_std_termios;
+        moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
+        moxaDriver->init_termios.c_ispeed = 9600;
+        moxaDriver->init_termios.c_ospeed = 9600;
+        moxaDriver->flags = TTY_DRIVER_REAL_RAW;
+        tty_set_operations(moxaDriver, &moxa_ops);
+
+        if (tty_register_driver(moxaDriver)) {
+                printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
+                put_tty_driver(moxaDriver);
+                return -1;
+        }
+
+        /* Find the boards defined from module args. */
+
+        for (i = 0; i < MAX_BOARDS; i++) {
+                if (!baseaddr[i])
+                        break;
+                if (type[i] == MOXA_BOARD_C218_ISA ||
+                                type[i] == MOXA_BOARD_C320_ISA) {
+                        pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
+                                        isabrds + 1, moxa_brdname[type[i] - 1],
+                                        baseaddr[i]);
+                        brd->boardType = type[i];
+                        brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
+                                        numports[i];
+                        brd->busType = MOXA_BUS_TYPE_ISA;
+                        brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
+                        if (!brd->basemem) {
+                                printk(KERN_ERR "MOXA: can't remap %lx\n",
+                                                baseaddr[i]);
+                                continue;
+                        }
+                        if (moxa_init_board(brd, NULL)) {
+                                iounmap(brd->basemem);
+                                brd->basemem = NULL;
+                                continue;
+                        }
+
+                        printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
+                                        "ready (%u ports, firmware loaded)\n",
+                                        baseaddr[i], brd->numPorts);
+
+                        brd++;
+                        isabrds++;
+                }
+        }
+
+#ifdef CONFIG_PCI
+        retval = pci_register_driver(&moxa_pci_driver);
+        if (retval) {
+                printk(KERN_ERR "Can't register MOXA pci driver!\n");
+                if (isabrds)
+                        retval = 0;
+        }
+#endif
+
+        return retval;
+}
+
+static void __exit moxa_exit(void)
+{
+        unsigned int i;
+
+#ifdef CONFIG_PCI
+        pci_unregister_driver(&moxa_pci_driver);
+#endif
+
+        for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
+                if (moxa_boards[i].ready)
+                        moxa_board_deinit(&moxa_boards[i]);
+
+        del_timer_sync(&moxaTimer);
+
+        if (tty_unregister_driver(moxaDriver))
+                printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
+                                "serial driver\n");
+        put_tty_driver(moxaDriver);
+}
+
+module_init(moxa_init);
+module_exit(moxa_exit);
+
+static void moxa_shutdown(struct tty_port *port)
+{
+        struct moxa_port *ch = container_of(port, struct moxa_port, port);
+        MoxaPortDisable(ch);
+        MoxaPortFlushData(ch, 2);
+}
+
+static int moxa_carrier_raised(struct tty_port *port)
+{
+        struct moxa_port *ch = container_of(port, struct moxa_port, port);
+        int dcd;
+
+        spin_lock_irq(&port->lock);
+        dcd = ch->DCDState;
+        spin_unlock_irq(&port->lock);
+        return dcd;
+}
+
+static void moxa_dtr_rts(struct tty_port *port, int onoff)
+{
+        struct moxa_port *ch = container_of(port, struct moxa_port, port);
+        MoxaPortLineCtrl(ch, onoff, onoff);
+}
+
+
+static int moxa_open(struct tty_struct *tty, struct file *filp)
+{
+        struct moxa_board_conf *brd;
+        struct moxa_port *ch;
+        int port;
+
+        port = tty->index;
+        if (port == MAX_PORTS) {
+                return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
+        }
+        if (mutex_lock_interruptible(&moxa_openlock))
+                return -ERESTARTSYS;
+        brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
+        if (!brd->ready) {
+                mutex_unlock(&moxa_openlock);
+                return -ENODEV;
+        }
+
+        if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
+                mutex_unlock(&moxa_openlock);
+                return -ENODEV;
+        }
+
+        ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
+        ch->port.count++;
+        tty->driver_data = ch;
+        tty_port_tty_set(&ch->port, tty);
+        mutex_lock(&ch->port.mutex);
+        if (!(ch->port.flags & ASYNC_INITIALIZED)) {
+                ch->statusflags = 0;
+                moxa_set_tty_param(tty, tty->termios);
+                MoxaPortLineCtrl(ch, 1, 1);
+                MoxaPortEnable(ch);
+                MoxaSetFifo(ch, ch->type == PORT_16550A);
+                ch->port.flags |= ASYNC_INITIALIZED;
+        }
+        mutex_unlock(&ch->port.mutex);
+        mutex_unlock(&moxa_openlock);
+
+        return tty_port_block_til_ready(&ch->port, tty, filp);
+}
+
+static void moxa_close(struct tty_struct *tty, struct file *filp)
+{
+        struct moxa_port *ch = tty->driver_data;
+        ch->cflag = tty->termios->c_cflag;
+        tty_port_close(&ch->port, tty, filp);
+}
+
+static int moxa_write(struct tty_struct *tty,
+                      const unsigned char *buf, int count)
+{
+        struct moxa_port *ch = tty->driver_data;
+        unsigned long flags;
+        int len;
+
+        if (ch == NULL)
+                return 0;
+
+        spin_lock_irqsave(&moxa_lock, flags);
+        len = MoxaPortWriteData(tty, buf, count);
+        spin_unlock_irqrestore(&moxa_lock, flags);
+
+        set_bit(LOWWAIT, &ch->statusflags);
+        return len;
+}
+
+static int moxa_write_room(struct tty_struct *tty)
+{
+        struct moxa_port *ch;
+
+        if (tty->stopped)
+                return 0;
+        ch = tty->driver_data;
+        if (ch == NULL)
+                return 0;
+        return MoxaPortTxFree(ch);
+}
+
+static void moxa_flush_buffer(struct tty_struct *tty)
+{
+        struct moxa_port *ch = tty->driver_data;
+
+        if (ch == NULL)
+                return;
+        MoxaPortFlushData(ch, 1);
+        tty_wakeup(tty);
+}
+
+static int moxa_chars_in_buffer(struct tty_struct *tty)
+{
+        struct moxa_port *ch = tty->driver_data;
+        int chars;
+
+        chars = MoxaPortTxQueue(ch);
+        if (chars)
+                /*
+                 * Make it possible to wakeup anything waiting for output
+                 * in tty_ioctl.c, etc.
+                 */
+                set_bit(EMPTYWAIT, &ch->statusflags);
+        return chars;
+}
+
+static int moxa_tiocmget(struct tty_struct *tty)
+{
+        struct moxa_port *ch = tty->driver_data;
+        int flag = 0, dtr, rts;
+
+        MoxaPortGetLineOut(ch, &dtr, &rts);
+        if (dtr)
+                flag |= TIOCM_DTR;
+        if (rts)
+                flag |= TIOCM_RTS;
+        dtr = MoxaPortLineStatus(ch);
+        if (dtr & 1)
+                flag |= TIOCM_CTS;
+        if (dtr & 2)
+                flag |= TIOCM_DSR;
+        if (dtr & 4)
+                flag |= TIOCM_CD;
+        return flag;
+}
+
+static int moxa_tiocmset(struct tty_struct *tty,
+                         unsigned int set, unsigned int clear)
+{
+        struct moxa_port *ch;
+        int dtr, rts;
+
+        mutex_lock(&moxa_openlock);
+        ch = tty->driver_data;
+        if (!ch) {
+                mutex_unlock(&moxa_openlock);
+                return -EINVAL;
+        }
+
+        MoxaPortGetLineOut(ch, &dtr, &rts);
+        if (set & TIOCM_RTS)
+                rts = 1;
+        if (set & TIOCM_DTR)
+                dtr = 1;
+        if (clear & TIOCM_RTS)
+                rts = 0;
+        if (clear & TIOCM_DTR)
+                dtr = 0;
+        MoxaPortLineCtrl(ch, dtr, rts);
+        mutex_unlock(&moxa_openlock);
+        return 0;
+}
+
+static void moxa_set_termios(struct tty_struct *tty,
+                struct ktermios *old_termios)
+{
+        struct moxa_port *ch = tty->driver_data;
+
+        if (ch == NULL)
+                return;
+        moxa_set_tty_param(tty, old_termios);
+        if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
+                wake_up_interruptible(&ch->port.open_wait);
+}
+
+static void moxa_stop(struct tty_struct *tty)
+{
+        struct moxa_port *ch = tty->driver_data;
+
+        if (ch == NULL)
+                return;
+        MoxaPortTxDisable(ch);
+        set_bit(TXSTOPPED, &ch->statusflags);
+}
+
+
+static void moxa_start(struct tty_struct *tty)
+{
+        struct moxa_port *ch = tty->driver_data;
+
+        if (ch == NULL)
+                return;
+
+        if (!(ch->statusflags & TXSTOPPED))
+                return;
+
+        MoxaPortTxEnable(ch);
+        clear_bit(TXSTOPPED, &ch->statusflags);
+}
+
+static void moxa_hangup(struct tty_struct *tty)
+{
+        struct moxa_port *ch = tty->driver_data;
+        tty_port_hangup(&ch->port);
+}
+
+static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
+{
+        struct tty_struct *tty;
+        unsigned long flags;
+        dcd = !!dcd;
+
+        spin_lock_irqsave(&p->port.lock, flags);
+        if (dcd != p->DCDState) {
+                p->DCDState = dcd;
+                spin_unlock_irqrestore(&p->port.lock, flags);
+                tty = tty_port_tty_get(&p->port);
+                if (tty && C_CLOCAL(tty) && !dcd)
+                        tty_hangup(tty);
+                tty_kref_put(tty);
+        }
+        else
+                spin_unlock_irqrestore(&p->port.lock, flags);
+}
+
+static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
+                u16 __iomem *ip)
+{
+        struct tty_struct *tty = tty_port_tty_get(&p->port);
+        void __iomem *ofsAddr;
+        unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
+        u16 intr;
+
+        if (tty) {
+                if (test_bit(EMPTYWAIT, &p->statusflags) &&
+                                MoxaPortTxQueue(p) == 0) {
+                        clear_bit(EMPTYWAIT, &p->statusflags);
+                        tty_wakeup(tty);
+                }
+                if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
+                                MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
+                        clear_bit(LOWWAIT, &p->statusflags);
+                        tty_wakeup(tty);
+                }
+
+                if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
+                                MoxaPortRxQueue(p) > 0) { /* RX */
+                        MoxaPortReadData(p);
+                        tty_schedule_flip(tty);
+                }
+        } else {
+                clear_bit(EMPTYWAIT, &p->statusflags);
+                MoxaPortFlushData(p, 0); /* flush RX */
+        }
+
+        if (!handle) /* nothing else to do */
+                goto put;
+
+        intr = readw(ip); /* port irq status */
+        if (intr == 0)
+                goto put;
+
+        writew(0, ip); /* ACK port */
+        ofsAddr = p->tableAddr;
+        if (intr & IntrTx) /* disable tx intr */
+                writew(readw(ofsAddr + HostStat) & ~WakeupTx,
+                                ofsAddr + HostStat);
+
+        if (!inited)
+                goto put;
+
+        if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
+                tty_insert_flip_char(tty, 0, TTY_BREAK);
+                tty_schedule_flip(tty);
+        }
+
+        if (intr & IntrLine)
+                moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
+put:
+        tty_kref_put(tty);
+
+        return 0;
+}
+
+static void moxa_poll(unsigned long ignored)
+{
+        struct moxa_board_conf *brd;
+        u16 __iomem *ip;
+        unsigned int card, port, served = 0;
+
+        spin_lock(&moxa_lock);
+        for (card = 0; card < MAX_BOARDS; card++) {
+                brd = &moxa_boards[card];
+                if (!brd->ready)
+                        continue;
+
+                served++;
+
+                ip = NULL;
+                if (readb(brd->intPend) == 0xff)
+                        ip = brd->intTable + readb(brd->intNdx);
+
+                for (port = 0; port < brd->numPorts; port++)
+                        moxa_poll_port(&brd->ports[port], !!ip, ip + port);
+
+                if (ip)
+                        writeb(0, brd->intPend); /* ACK */
+
+                if (moxaLowWaterChk) {
+                        struct moxa_port *p = brd->ports;
+                        for (port = 0; port < brd->numPorts; port++, p++)
+                                if (p->lowChkFlag) {
+                                        p->lowChkFlag = 0;
+                                        moxa_low_water_check(p->tableAddr);
+                                }
+                }
+        }
+        moxaLowWaterChk = 0;
+
+        if (served)
+                mod_timer(&moxaTimer, jiffies + HZ / 50);
+        spin_unlock(&moxa_lock);
+}
+
+/******************************************************************************/
+
+static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        register struct ktermios *ts = tty->termios;
+        struct moxa_port *ch = tty->driver_data;
+        int rts, cts, txflow, rxflow, xany, baud;
+
+        rts = cts = txflow = rxflow = xany = 0;
+        if (ts->c_cflag & CRTSCTS)
+                rts = cts = 1;
+        if (ts->c_iflag & IXON)
+                txflow = 1;
+        if (ts->c_iflag & IXOFF)
+                rxflow = 1;
+        if (ts->c_iflag & IXANY)
+                xany = 1;
+
+        /* Clear the features we don't support */
+        ts->c_cflag &= ~CMSPAR;
+        MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
+        baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
+        if (baud == -1)
+                baud = tty_termios_baud_rate(old_termios);
+        /* Not put the baud rate into the termios data */
+        tty_encode_baud_rate(tty, baud, baud);
+}
+
+/*****************************************************************************
+ *      Driver level functions:                                              *
+ *****************************************************************************/
+
+static void MoxaPortFlushData(struct moxa_port *port, int mode)
+{
+        void __iomem *ofsAddr;
+        if (mode < 0 || mode > 2)
+                return;
+        ofsAddr = port->tableAddr;
+        moxafunc(ofsAddr, FC_FlushQueue, mode);
+        if (mode != 1) {
+                port->lowChkFlag = 0;
+                moxa_low_water_check(ofsAddr);
+        }
+}
+
+/*
+ *    Moxa Port Number Description:
+ *
+ *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
+ *      the port number using in MOXA driver functions will be 0 to 31 for
+ *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
+ *      to 127 for fourth. For example, if you setup three MOXA boards,
+ *      first board is C218, second board is C320-16 and third board is
+ *      C320-32. The port number of first board (C218 - 8 ports) is from
+ *      0 to 7. The port number of second board (C320 - 16 ports) is form
+ *      32 to 47. The port number of third board (C320 - 32 ports) is from
+ *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
+ *      127 will be invalid.
+ *
+ *
+ *      Moxa Functions Description:
+ *
+ *      Function 1:     Driver initialization routine, this routine must be
+ *                      called when initialized driver.
+ *      Syntax:
+ *      void MoxaDriverInit();
+ *
+ *
+ *      Function 2:     Moxa driver private IOCTL command processing.
+ *      Syntax:
+ *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
+ *
+ *           unsigned int cmd   : IOCTL command
+ *           unsigned long arg  : IOCTL argument
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    0  (OK)
+ *                      -EINVAL
+ *                      -ENOIOCTLCMD
+ *
+ *
+ *      Function 6:     Enable this port to start Tx/Rx data.
+ *      Syntax:
+ *      void MoxaPortEnable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 7:     Disable this port
+ *      Syntax:
+ *      void MoxaPortDisable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 10:    Setting baud rate of this port.
+ *      Syntax:
+ *      speed_t MoxaPortSetBaud(int port, speed_t baud);
+ *           int port           : port number (0 - 127)
+ *           long baud          : baud rate (50 - 115200)
+ *
+ *           return:    0       : this port is invalid or baud < 50
+ *                      50 - 115200 : the real baud rate set to the port, if
+ *                                    the argument baud is large than maximun
+ *                                    available baud rate, the real setting
+ *                                    baud rate will be the maximun baud rate.
+ *
+ *
+ *      Function 12:    Configure the port.
+ *      Syntax:
+ *      int  MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
+ *           int port           : port number (0 - 127)
+ *           struct ktermios * termio : termio structure pointer
+ *           speed_t baud       : baud rate
+ *
+ *           return:    -1      : this port is invalid or termio == NULL
+ *                      0       : setting O.K.
+ *
+ *
+ *      Function 13:    Get the DTR/RTS state of this port.
+ *      Syntax:
+ *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
+ *           int port           : port number (0 - 127)
+ *           int * dtrState     : pointer to INT to receive the current DTR
+ *                                state. (if NULL, this function will not
+ *                                write to this address)
+ *           int * rtsState     : pointer to INT to receive the current RTS
+ *                                state. (if NULL, this function will not
+ *                                write to this address)
+ *
+ *           return:    -1      : this port is invalid
+ *                      0       : O.K.
+ *
+ *
+ *      Function 14:    Setting the DTR/RTS output state of this port.
+ *      Syntax:
+ *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
+ *           int port           : port number (0 - 127)
+ *           int dtrState       : DTR output state (0: off, 1: on)
+ *           int rtsState       : RTS output state (0: off, 1: on)
+ *
+ *
+ *      Function 15:    Setting the flow control of this port.
+ *      Syntax:
+ *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
+ *                            int txFlow,int xany);
+ *           int port           : port number (0 - 127)
+ *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
+ *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
+ *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
+ *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
+ *           int xany           : S/W XANY flow control (0: no, 1: yes)
+ *
+ *
+ *      Function 16:    Get ths line status of this port
+ *      Syntax:
+ *      int  MoxaPortLineStatus(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    Bit 0 - CTS state (0: off, 1: on)
+ *                      Bit 1 - DSR state (0: off, 1: on)
+ *                      Bit 2 - DCD state (0: off, 1: on)
+ *
+ *
+ *      Function 19:    Flush the Rx/Tx buffer data of this port.
+ *      Syntax:
+ *      void MoxaPortFlushData(int port, int mode);
+ *           int port           : port number (0 - 127)
+ *           int mode    
+ *                      0       : flush the Rx buffer 
+ *                      1       : flush the Tx buffer 
+ *                      2       : flush the Rx and Tx buffer 
+ *
+ *
+ *      Function 20:    Write data.
+ *      Syntax:
+ *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
+ *           int port           : port number (0 - 127)
+ *           unsigned char * buffer     : pointer to write data buffer.
+ *           int length         : write data length
+ *
+ *           return:    0 - length      : real write data length
+ *
+ *
+ *      Function 21:    Read data.
+ *      Syntax:
+ *      int  MoxaPortReadData(int port, struct tty_struct *tty);
+ *           int port           : port number (0 - 127)
+ *           struct tty_struct *tty : tty for data
+ *
+ *           return:    0 - length      : real read data length
+ *
+ *
+ *      Function 24:    Get the Tx buffer current queued data bytes
+ *      Syntax:
+ *      int  MoxaPortTxQueue(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    ..      : Tx buffer current queued data bytes
+ *
+ *
+ *      Function 25:    Get the Tx buffer current free space
+ *      Syntax:
+ *      int  MoxaPortTxFree(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    ..      : Tx buffer current free space
+ *
+ *
+ *      Function 26:    Get the Rx buffer current queued data bytes
+ *      Syntax:
+ *      int  MoxaPortRxQueue(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    ..      : Rx buffer current queued data bytes
+ *
+ *
+ *      Function 28:    Disable port data transmission.
+ *      Syntax:
+ *      void MoxaPortTxDisable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 29:    Enable port data transmission.
+ *      Syntax:
+ *      void MoxaPortTxEnable(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *
+ *      Function 31:    Get the received BREAK signal count and reset it.
+ *      Syntax:
+ *      int  MoxaPortResetBrkCnt(int port);
+ *           int port           : port number (0 - 127)
+ *
+ *           return:    0 - ..  : BREAK signal count
+ *
+ *
+ */
+
+static void MoxaPortEnable(struct moxa_port *port)
+{
+        void __iomem *ofsAddr;
+        u16 lowwater = 512;
+
+        ofsAddr = port->tableAddr;
+        writew(lowwater, ofsAddr + Low_water);
+        if (MOXA_IS_320(port->board))
+                moxafunc(ofsAddr, FC_SetBreakIrq, 0);
+        else
+                writew(readw(ofsAddr + HostStat) | WakeupBreak,
+                                ofsAddr + HostStat);
+
+        moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
+        moxafunc(ofsAddr, FC_FlushQueue, 2);
+
+        moxafunc(ofsAddr, FC_EnableCH, Magic_code);
+        MoxaPortLineStatus(port);
+}
+
+static void MoxaPortDisable(struct moxa_port *port)
+{
+        void __iomem *ofsAddr = port->tableAddr;
+
+        moxafunc(ofsAddr, FC_SetFlowCtl, 0);    /* disable flow control */
+        moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
+        writew(0, ofsAddr + HostStat);
+        moxafunc(ofsAddr, FC_DisableCH, Magic_code);
+}
+
+static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
+{
+        void __iomem *ofsAddr = port->tableAddr;
+        unsigned int clock, val;
+        speed_t max;
+
+        max = MOXA_IS_320(port->board) ? 460800 : 921600;
+        if (baud < 50)
+                return 0;
+        if (baud > max)
+                baud = max;
+        clock = 921600;
+        val = clock / baud;
+        moxafunc(ofsAddr, FC_SetBaud, val);
+        baud = clock / val;
+        return baud;
+}
+
+static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
+                speed_t baud)
+{
+        void __iomem *ofsAddr;
+        tcflag_t mode = 0;
+
+        ofsAddr = port->tableAddr;
+
+        mode = termio->c_cflag & CSIZE;
+        if (mode == CS5)
+                mode = MX_CS5;
+        else if (mode == CS6)
+                mode = MX_CS6;
+        else if (mode == CS7)
+                mode = MX_CS7;
+        else if (mode == CS8)
+                mode = MX_CS8;
+
+        if (termio->c_cflag & CSTOPB) {
+                if (mode == MX_CS5)
+                        mode |= MX_STOP15;
+                else
+                        mode |= MX_STOP2;
+        } else
+                mode |= MX_STOP1;
+
+        if (termio->c_cflag & PARENB) {
+                if (termio->c_cflag & PARODD)
+                        mode |= MX_PARODD;
+                else
+                        mode |= MX_PAREVEN;
+        } else
+                mode |= MX_PARNONE;
+
+        moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
+
+        if (MOXA_IS_320(port->board) && baud >= 921600)
+                return -1;
+
+        baud = MoxaPortSetBaud(port, baud);
+
+        if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
+                spin_lock_irq(&moxafunc_lock);
+                writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
+                writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
+                writeb(FC_SetXonXoff, ofsAddr + FuncCode);
+                moxa_wait_finish(ofsAddr);
+                spin_unlock_irq(&moxafunc_lock);
+
+        }
+        return baud;
+}
+
+static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
+                int *rtsState)
+{
+        if (dtrState)
+                *dtrState = !!(port->lineCtrl & DTR_ON);
+        if (rtsState)
+                *rtsState = !!(port->lineCtrl & RTS_ON);
+
+        return 0;
+}
+
+static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
+{
+        u8 mode = 0;
+
+        if (dtr)
+                mode |= DTR_ON;
+        if (rts)
+                mode |= RTS_ON;
+        port->lineCtrl = mode;
+        moxafunc(port->tableAddr, FC_LineControl, mode);
+}
+
+static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
+                int txflow, int rxflow, int txany)
+{
+        int mode = 0;
+
+        if (rts)
+                mode |= RTS_FlowCtl;
+        if (cts)
+                mode |= CTS_FlowCtl;
+        if (txflow)
+                mode |= Tx_FlowCtl;
+        if (rxflow)
+                mode |= Rx_FlowCtl;
+        if (txany)
+                mode |= IXM_IXANY;
+        moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
+}
+
+static int MoxaPortLineStatus(struct moxa_port *port)
+{
+        void __iomem *ofsAddr;
+        int val;
+
+        ofsAddr = port->tableAddr;
+        if (MOXA_IS_320(port->board))
+                val = moxafuncret(ofsAddr, FC_LineStatus, 0);
+        else
+                val = readw(ofsAddr + FlagStat) >> 4;
+        val &= 0x0B;
+        if (val & 8)
+                val |= 4;
+        moxa_new_dcdstate(port, val & 8);
+        val &= 7;
+        return val;
+}
+
+static int MoxaPortWriteData(struct tty_struct *tty,
+                const unsigned char *buffer, int len)
+{
+        struct moxa_port *port = tty->driver_data;
+        void __iomem *baseAddr, *ofsAddr, *ofs;
+        unsigned int c, total;
+        u16 head, tail, tx_mask, spage, epage;
+        u16 pageno, pageofs, bufhead;
+
+        ofsAddr = port->tableAddr;
+        baseAddr = port->board->basemem;
+        tx_mask = readw(ofsAddr + TX_mask);
+        spage = readw(ofsAddr + Page_txb);
+        epage = readw(ofsAddr + EndPage_txb);
+        tail = readw(ofsAddr + TXwptr);
+        head = readw(ofsAddr + TXrptr);
+        c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
+        if (c > len)
+                c = len;
+        moxaLog.txcnt[port->port.tty->index] += c;
+        total = c;
+        if (spage == epage) {
+                bufhead = readw(ofsAddr + Ofs_txb);
+                writew(spage, baseAddr + Control_reg);
+                while (c > 0) {
+                        if (head > tail)
+                                len = head - tail - 1;
+                        else
+                                len = tx_mask + 1 - tail;
+                        len = (c > len) ? len : c;
+                        ofs = baseAddr + DynPage_addr + bufhead + tail;
+                        memcpy_toio(ofs, buffer, len);
+                        buffer += len;
+                        tail = (tail + len) & tx_mask;
+                        c -= len;
+                }
+        } else {
+                pageno = spage + (tail >> 13);
+                pageofs = tail & Page_mask;
+                while (c > 0) {
+                        len = Page_size - pageofs;
+                        if (len > c)
+                                len = c;
+                        writeb(pageno, baseAddr + Control_reg);
+                        ofs = baseAddr + DynPage_addr + pageofs;
+                        memcpy_toio(ofs, buffer, len);
+                        buffer += len;
+                        if (++pageno == epage)
+                                pageno = spage;
+                        pageofs = 0;
+                        c -= len;
+                }
+                tail = (tail + total) & tx_mask;
+        }
+        writew(tail, ofsAddr + TXwptr);
+        writeb(1, ofsAddr + CD180TXirq);        /* start to send */
+        return total;
+}
+
+static int MoxaPortReadData(struct moxa_port *port)
+{
+        struct tty_struct *tty = port->port.tty;
+        unsigned char *dst;
+        void __iomem *baseAddr, *ofsAddr, *ofs;
+        unsigned int count, len, total;
+        u16 tail, rx_mask, spage, epage;
+        u16 pageno, pageofs, bufhead, head;
+
+        ofsAddr = port->tableAddr;
+        baseAddr = port->board->basemem;
+        head = readw(ofsAddr + RXrptr);
+        tail = readw(ofsAddr + RXwptr);
+        rx_mask = readw(ofsAddr + RX_mask);
+        spage = readw(ofsAddr + Page_rxb);
+        epage = readw(ofsAddr + EndPage_rxb);
+        count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
+        if (count == 0)
+                return 0;
+
+        total = count;
+        moxaLog.rxcnt[tty->index] += total;
+        if (spage == epage) {
+                bufhead = readw(ofsAddr + Ofs_rxb);
+                writew(spage, baseAddr + Control_reg);
+                while (count > 0) {
+                        ofs = baseAddr + DynPage_addr + bufhead + head;
+                        len = (tail >= head) ? (tail - head) :
+                                        (rx_mask + 1 - head);
+                        len = tty_prepare_flip_string(tty, &dst,
+                                        min(len, count));
+                        memcpy_fromio(dst, ofs, len);
+                        head = (head + len) & rx_mask;
+                        count -= len;
+                }
+        } else {
+                pageno = spage + (head >> 13);
+                pageofs = head & Page_mask;
+                while (count > 0) {
+                        writew(pageno, baseAddr + Control_reg);
+                        ofs = baseAddr + DynPage_addr + pageofs;
+                        len = tty_prepare_flip_string(tty, &dst,
+                                        min(Page_size - pageofs, count));
+                        memcpy_fromio(dst, ofs, len);
+
+                        count -= len;
+                        pageofs = (pageofs + len) & Page_mask;
+                        if (pageofs == 0 && ++pageno == epage)
+                                pageno = spage;
+                }
+                head = (head + total) & rx_mask;
+        }
+        writew(head, ofsAddr + RXrptr);
+        if (readb(ofsAddr + FlagStat) & Xoff_state) {
+                moxaLowWaterChk = 1;
+                port->lowChkFlag = 1;
+        }
+        return total;
+}
+
+
+static int MoxaPortTxQueue(struct moxa_port *port)
+{
+        void __iomem *ofsAddr = port->tableAddr;
+        u16 rptr, wptr, mask;
+
+        rptr = readw(ofsAddr + TXrptr);
+        wptr = readw(ofsAddr + TXwptr);
+        mask = readw(ofsAddr + TX_mask);
+        return (wptr - rptr) & mask;
+}
+
+static int MoxaPortTxFree(struct moxa_port *port)
+{
+        void __iomem *ofsAddr = port->tableAddr;
+        u16 rptr, wptr, mask;
+
+        rptr = readw(ofsAddr + TXrptr);
+        wptr = readw(ofsAddr + TXwptr);
+        mask = readw(ofsAddr + TX_mask);
+        return mask - ((wptr - rptr) & mask);
+}
+
+static int MoxaPortRxQueue(struct moxa_port *port)
+{
+        void __iomem *ofsAddr = port->tableAddr;
+        u16 rptr, wptr, mask;
+
+        rptr = readw(ofsAddr + RXrptr);
+        wptr = readw(ofsAddr + RXwptr);
+        mask = readw(ofsAddr + RX_mask);
+        return (wptr - rptr) & mask;
+}
+
+static void MoxaPortTxDisable(struct moxa_port *port)
+{
+        moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
+}
+
+static void MoxaPortTxEnable(struct moxa_port *port)
+{
+        moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
+}
+
+static int moxa_get_serial_info(struct moxa_port *info,
+                struct serial_struct __user *retinfo)
+{
+        struct serial_struct tmp = {
+                .type = info->type,
+                .line = info->port.tty->index,
+                .flags = info->port.flags,
+                .baud_base = 921600,
+                .close_delay = info->port.close_delay
+        };
+        return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
+}
+
+
+static int moxa_set_serial_info(struct moxa_port *info,
+                struct serial_struct __user *new_info)
+{
+        struct serial_struct new_serial;
+
+        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+                return -EFAULT;
+
+        if (new_serial.irq != 0 || new_serial.port != 0 ||
+                        new_serial.custom_divisor != 0 ||
+                        new_serial.baud_base != 921600)
+                return -EPERM;
+
+        if (!capable(CAP_SYS_ADMIN)) {
+                if (((new_serial.flags & ~ASYNC_USR_MASK) !=
+                     (info->port.flags & ~ASYNC_USR_MASK)))
+                        return -EPERM;
+        } else
+                info->port.close_delay = new_serial.close_delay * HZ / 100;
+
+        new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
+        new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
+
+        MoxaSetFifo(info, new_serial.type == PORT_16550A);
+
+        info->type = new_serial.type;
+        return 0;
+}
+
+
+
+/*****************************************************************************
+ *      Static local functions:                                              *
+ *****************************************************************************/
+
+static void MoxaSetFifo(struct moxa_port *port, int enable)
+{
+        void __iomem *ofsAddr = port->tableAddr;
+
+        if (!enable) {
+                moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
+                moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
+        } else {
+                moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
+                moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
+        }
+}
diff --git a/drivers/tty/moxa.h b/drivers/tty/moxa.h
new file mode 100644
index 000000000000..87d16ce57be7
--- /dev/null
+++ b/drivers/tty/moxa.h
@@ -0,0 +1,304 @@
+#ifndef MOXA_H_FILE
+#define MOXA_H_FILE
+
+#define MOXA            0x400
+#define MOXA_GET_IQUEUE         (MOXA + 1)      /* get input buffered count */
+#define MOXA_GET_OQUEUE         (MOXA + 2)      /* get output buffered count */
+#define MOXA_GETDATACOUNT       (MOXA + 23)
+#define MOXA_GET_IOQUEUE        (MOXA + 27)
+#define MOXA_FLUSH_QUEUE        (MOXA + 28)
+#define MOXA_GETMSTATUS         (MOXA + 65)
+
+/*
+ *    System Configuration
+ */
+
+#define Magic_code      0x404
+
+/*
+ *    for C218 BIOS initialization
+ */
+#define C218_ConfBase   0x800
+#define C218_status     (C218_ConfBase + 0)     /* BIOS running status    */
+#define C218_diag       (C218_ConfBase + 2)     /* diagnostic status      */
+#define C218_key        (C218_ConfBase + 4)     /* WORD (0x218 for C218) */
+#define C218DLoad_len   (C218_ConfBase + 6)     /* WORD           */
+#define C218check_sum   (C218_ConfBase + 8)     /* BYTE           */
+#define C218chksum_ok   (C218_ConfBase + 0x0a)  /* BYTE (1:ok)            */
+#define C218_TestRx     (C218_ConfBase + 0x10)  /* 8 bytes for 8 ports    */
+#define C218_TestTx     (C218_ConfBase + 0x18)  /* 8 bytes for 8 ports    */
+#define C218_RXerr      (C218_ConfBase + 0x20)  /* 8 bytes for 8 ports    */
+#define C218_ErrFlag    (C218_ConfBase + 0x28)  /* 8 bytes for 8 ports    */
+
+#define C218_LoadBuf    0x0F00
+#define C218_KeyCode    0x218
+#define CP204J_KeyCode  0x204
+
+/*
+ *    for C320 BIOS initialization
+ */
+#define C320_ConfBase   0x800
+#define C320_LoadBuf    0x0f00
+#define STS_init        0x05    /* for C320_status        */
+
+#define C320_status     C320_ConfBase + 0       /* BIOS running status    */
+#define C320_diag       C320_ConfBase + 2       /* diagnostic status      */
+#define C320_key        C320_ConfBase + 4       /* WORD (0320H for C320) */
+#define C320DLoad_len   C320_ConfBase + 6       /* WORD           */
+#define C320check_sum   C320_ConfBase + 8       /* WORD           */
+#define C320chksum_ok   C320_ConfBase + 0x0a    /* WORD (1:ok)            */
+#define C320bapi_len    C320_ConfBase + 0x0c    /* WORD           */
+#define C320UART_no     C320_ConfBase + 0x0e    /* WORD           */
+
+#define C320_KeyCode    0x320
+
+#define FixPage_addr    0x0000  /* starting addr of static page  */
+#define DynPage_addr    0x2000  /* starting addr of dynamic page */
+#define C218_start      0x3000  /* starting addr of C218 BIOS prg */
+#define Control_reg     0x1ff0  /* select page and reset control */
+#define HW_reset        0x80
+
+/*
+ *    Function Codes
+ */
+#define FC_CardReset    0x80
+#define FC_ChannelReset 1       /* C320 firmware not supported */
+#define FC_EnableCH     2
+#define FC_DisableCH    3
+#define FC_SetParam     4
+#define FC_SetMode      5
+#define FC_SetRate      6
+#define FC_LineControl  7
+#define FC_LineStatus   8
+#define FC_XmitControl  9
+#define FC_FlushQueue   10
+#define FC_SendBreak    11
+#define FC_StopBreak    12
+#define FC_LoopbackON   13
+#define FC_LoopbackOFF  14
+#define FC_ClrIrqTable  15
+#define FC_SendXon      16
+#define FC_SetTermIrq   17      /* C320 firmware not supported */
+#define FC_SetCntIrq    18      /* C320 firmware not supported */
+#define FC_SetBreakIrq  19
+#define FC_SetLineIrq   20
+#define FC_SetFlowCtl   21
+#define FC_GenIrq       22
+#define FC_InCD180      23
+#define FC_OutCD180     24
+#define FC_InUARTreg    23
+#define FC_OutUARTreg   24
+#define FC_SetXonXoff   25
+#define FC_OutCD180CCR  26
+#define FC_ExtIQueue    27
+#define FC_ExtOQueue    28
+#define FC_ClrLineIrq   29
+#define FC_HWFlowCtl    30
+#define FC_GetClockRate 35
+#define FC_SetBaud      36
+#define FC_SetDataMode  41
+#define FC_GetCCSR      43
+#define FC_GetDataError 45
+#define FC_RxControl    50
+#define FC_ImmSend      51
+#define FC_SetXonState  52
+#define FC_SetXoffState 53
+#define FC_SetRxFIFOTrig 54
+#define FC_SetTxFIFOCnt 55
+#define FC_UnixRate     56
+#define FC_UnixResetTimer 57
+
+#define RxFIFOTrig1     0
+#define RxFIFOTrig4     1
+#define RxFIFOTrig8     2
+#define RxFIFOTrig14    3
+
+/*
+ *    Dual-Ported RAM
+ */
+#define DRAM_global     0
+#define INT_data        (DRAM_global + 0)
+#define Config_base     (DRAM_global + 0x108)
+
+#define IRQindex        (INT_data + 0)
+#define IRQpending      (INT_data + 4)
+#define IRQtable        (INT_data + 8)
+
+/*
+ *    Interrupt Status
+ */
+#define IntrRx          0x01    /* receiver data O.K.             */
+#define IntrTx          0x02    /* transmit buffer empty  */
+#define IntrFunc        0x04    /* function complete              */
+#define IntrBreak       0x08    /* received break         */
+#define IntrLine        0x10    /* line status change
+                                   for transmitter                */
+#define IntrIntr        0x20    /* received INTR code             */
+#define IntrQuit        0x40    /* received QUIT code             */
+#define IntrEOF         0x80    /* received EOF code              */
+
+#define IntrRxTrigger   0x100   /* rx data count reach tigger value */
+#define IntrTxTrigger   0x200   /* tx data count below trigger value */
+
+#define Magic_no        (Config_base + 0)
+#define Card_model_no   (Config_base + 2)
+#define Total_ports     (Config_base + 4)
+#define Module_cnt      (Config_base + 8)
+#define Module_no       (Config_base + 10)
+#define Timer_10ms      (Config_base + 14)
+#define Disable_IRQ     (Config_base + 20)
+#define TMS320_PORT1    (Config_base + 22)
+#define TMS320_PORT2    (Config_base + 24)
+#define TMS320_CLOCK    (Config_base + 26)
+
+/*
+ *    DATA BUFFER in DRAM
+ */
+#define Extern_table    0x400   /* Base address of the external table
+                                   (24 words *    64) total 3K bytes
+                                   (24 words * 128) total 6K bytes */
+#define Extern_size     0x60    /* 96 bytes                       */
+#define RXrptr          0x00    /* read pointer for RX buffer     */
+#define RXwptr          0x02    /* write pointer for RX buffer    */
+#define TXrptr          0x04    /* read pointer for TX buffer     */
+#define TXwptr          0x06    /* write pointer for TX buffer    */
+#define HostStat        0x08    /* IRQ flag and general flag      */
+#define FlagStat        0x0A
+#define FlowControl     0x0C    /* B7 B6 B5 B4 B3 B2 B1 B0              */
+                                /*  x  x  x  x  |  |  |  |            */
+                                /*              |  |  |  + CTS flow   */
+                                /*              |  |  +--- RTS flow   */
+                                /*              |  +------ TX Xon/Xoff */
+                                /*              +--------- RX Xon/Xoff */
+#define Break_cnt       0x0E    /* received break count   */
+#define CD180TXirq      0x10    /* if non-0: enable TX irq        */
+#define RX_mask         0x12
+#define TX_mask         0x14
+#define Ofs_rxb         0x16
+#define Ofs_txb         0x18
+#define Page_rxb        0x1A
+#define Page_txb        0x1C
+#define EndPage_rxb     0x1E
+#define EndPage_txb     0x20
+#define Data_error      0x22
+#define RxTrigger       0x28
+#define TxTrigger       0x2a
+
+#define rRXwptr         0x34
+#define Low_water       0x36
+
+#define FuncCode        0x40
+#define FuncArg         0x42
+#define FuncArg1        0x44
+
+#define C218rx_size     0x2000  /* 8K bytes */
+#define C218tx_size     0x8000  /* 32K bytes */
+
+#define C218rx_mask     (C218rx_size - 1)
+#define C218tx_mask     (C218tx_size - 1)
+
+#define C320p8rx_size   0x2000
+#define C320p8tx_size   0x8000
+#define C320p8rx_mask   (C320p8rx_size - 1)
+#define C320p8tx_mask   (C320p8tx_size - 1)
+
+#define C320p16rx_size  0x2000
+#define C320p16tx_size  0x4000
+#define C320p16rx_mask  (C320p16rx_size - 1)
+#define C320p16tx_mask  (C320p16tx_size - 1)
+
+#define C320p24rx_size  0x2000
+#define C320p24tx_size  0x2000
+#define C320p24rx_mask  (C320p24rx_size - 1)
+#define C320p24tx_mask  (C320p24tx_size - 1)
+
+#define C320p32rx_size  0x1000
+#define C320p32tx_size  0x1000
+#define C320p32rx_mask  (C320p32rx_size - 1)
+#define C320p32tx_mask  (C320p32tx_size - 1)
+
+#define Page_size       0x2000U
+#define Page_mask       (Page_size - 1)
+#define C218rx_spage    3
+#define C218tx_spage    4
+#define C218rx_pageno   1
+#define C218tx_pageno   4
+#define C218buf_pageno  5
+
+#define C320p8rx_spage  3
+#define C320p8tx_spage  4
+#define C320p8rx_pgno   1
+#define C320p8tx_pgno   4
+#define C320p8buf_pgno  5
+
+#define C320p16rx_spage 3
+#define C320p16tx_spage 4
+#define C320p16rx_pgno  1
+#define C320p16tx_pgno  2
+#define C320p16buf_pgno 3
+
+#define C320p24rx_spage 3
+#define C320p24tx_spage 4
+#define C320p24rx_pgno  1
+#define C320p24tx_pgno  1
+#define C320p24buf_pgno 2
+
+#define C320p32rx_spage 3
+#define C320p32tx_ofs   C320p32rx_size
+#define C320p32tx_spage 3
+#define C320p32buf_pgno 1
+
+/*
+ *    Host Status
+ */
+#define WakeupRx        0x01
+#define WakeupTx        0x02
+#define WakeupBreak     0x08
+#define WakeupLine      0x10
+#define WakeupIntr      0x20
+#define WakeupQuit      0x40
+#define WakeupEOF       0x80    /* used in VTIME control */
+#define WakeupRxTrigger 0x100
+#define WakeupTxTrigger 0x200
+/*
+ *    Flag status
+ */
+#define Rx_over         0x01
+#define Xoff_state      0x02
+#define Tx_flowOff      0x04
+#define Tx_enable       0x08
+#define CTS_state       0x10
+#define DSR_state       0x20
+#define DCD_state       0x80
+/*
+ *    FlowControl
+ */
+#define CTS_FlowCtl     1
+#define RTS_FlowCtl     2
+#define Tx_FlowCtl      4
+#define Rx_FlowCtl      8
+#define IXM_IXANY       0x10
+
+#define LowWater        128
+
+#define DTR_ON          1
+#define RTS_ON          2
+#define CTS_ON          1
+#define DSR_ON          2
+#define DCD_ON          8
+
+/* mode definition */
+#define MX_CS8          0x03
+#define MX_CS7          0x02
+#define MX_CS6          0x01
+#define MX_CS5          0x00
+
+#define MX_STOP1        0x00
+#define MX_STOP15       0x04
+#define MX_STOP2        0x08
+
+#define MX_PARNONE      0x00
+#define MX_PAREVEN      0x40
+#define MX_PARODD       0xC0
+
+#endif
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
new file mode 100644
index 000000000000..d188f378684d
--- /dev/null
+++ b/drivers/tty/mxser.c
@@ -0,0 +1,2757 @@
+/*
+ *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
+ *
+ *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
+ *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
+ *
+ *      This code is loosely based on the 1.8 moxa driver which is based on
+ *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
+ *      others.
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
+ *      <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
+ *      www.moxa.com.
+ *      - Fixed x86_64 cleanness
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/bitops.h>
+#include <linux/slab.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#include "mxser.h"
+
+#define MXSER_VERSION   "2.0.5"         /* 1.14 */
+#define MXSERMAJOR       174
+
+#define MXSER_BOARDS            4       /* Max. boards */
+#define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
+#define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
+#define MXSER_ISR_PASS_LIMIT    100
+
+/*CheckIsMoxaMust return value*/
+#define MOXA_OTHER_UART         0x00
+#define MOXA_MUST_MU150_HWID    0x01
+#define MOXA_MUST_MU860_HWID    0x02
+
+#define WAKEUP_CHARS            256
+
+#define UART_MCR_AFE            0x20
+#define UART_LSR_SPECIAL        0x1E
+
+#define PCI_DEVICE_ID_POS104UL  0x1044
+#define PCI_DEVICE_ID_CB108     0x1080
+#define PCI_DEVICE_ID_CP102UF   0x1023
+#define PCI_DEVICE_ID_CP112UL   0x1120
+#define PCI_DEVICE_ID_CB114     0x1142
+#define PCI_DEVICE_ID_CP114UL   0x1143
+#define PCI_DEVICE_ID_CB134I    0x1341
+#define PCI_DEVICE_ID_CP138U    0x1380
+
+
+#define C168_ASIC_ID    1
+#define C104_ASIC_ID    2
+#define C102_ASIC_ID    0xB
+#define CI132_ASIC_ID   4
+#define CI134_ASIC_ID   3
+#define CI104J_ASIC_ID  5
+
+#define MXSER_HIGHBAUD  1
+#define MXSER_HAS2      2
+
+/* This is only for PCI */
+static const struct {
+        int type;
+        int tx_fifo;
+        int rx_fifo;
+        int xmit_fifo_size;
+        int rx_high_water;
+        int rx_trigger;
+        int rx_low_water;
+        long max_baud;
+} Gpci_uart_info[] = {
+        {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
+        {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
+        {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
+};
+#define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
+
+struct mxser_cardinfo {
+        char *name;
+        unsigned int nports;
+        unsigned int flags;
+};
+
+static const struct mxser_cardinfo mxser_cards[] = {
+/* 0*/  { "C168 series",        8, },
+        { "C104 series",        4, },
+        { "CI-104J series",     4, },
+        { "C168H/PCI series",   8, },
+        { "C104H/PCI series",   4, },
+/* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
+        { "CI-132 series",      4, MXSER_HAS2 },
+        { "CI-134 series",      4, },
+        { "CP-132 series",      2, },
+        { "CP-114 series",      4, },
+/*10*/  { "CT-114 series",      4, },
+        { "CP-102 series",      2, MXSER_HIGHBAUD },
+        { "CP-104U series",     4, },
+        { "CP-168U series",     8, },
+        { "CP-132U series",     2, },
+/*15*/  { "CP-134U series",     4, },
+        { "CP-104JU series",    4, },
+        { "Moxa UC7000 Serial", 8, },           /* RC7000 */
+        { "CP-118U series",     8, },
+        { "CP-102UL series",    2, },
+/*20*/  { "CP-102U series",     2, },
+        { "CP-118EL series",    8, },
+        { "CP-168EL series",    8, },
+        { "CP-104EL series",    4, },
+        { "CB-108 series",      8, },
+/*25*/  { "CB-114 series",      4, },
+        { "CB-134I series",     4, },
+        { "CP-138U series",     8, },
+        { "POS-104UL series",   4, },
+        { "CP-114UL series",    4, },
+/*30*/  { "CP-102UF series",    2, },
+        { "CP-112UL series",    2, },
+};
+
+/* driver_data correspond to the lines in the structure above
+   see also ISA probe function before you change something */
+static struct pci_device_id mxser_pcibrds[] = {
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
+        { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
+        { }
+};
+MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
+
+static unsigned long ioaddr[MXSER_BOARDS];
+static int ttymajor = MXSERMAJOR;
+
+/* Variables for insmod */
+
+MODULE_AUTHOR("Casper Yang");
+MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
+module_param_array(ioaddr, ulong, NULL, 0);
+MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
+module_param(ttymajor, int, 0);
+MODULE_LICENSE("GPL");
+
+struct mxser_log {
+        int tick;
+        unsigned long rxcnt[MXSER_PORTS];
+        unsigned long txcnt[MXSER_PORTS];
+};
+
+struct mxser_mon {
+        unsigned long rxcnt;
+        unsigned long txcnt;
+        unsigned long up_rxcnt;
+        unsigned long up_txcnt;
+        int modem_status;
+        unsigned char hold_reason;
+};
+
+struct mxser_mon_ext {
+        unsigned long rx_cnt[32];
+        unsigned long tx_cnt[32];
+        unsigned long up_rxcnt[32];
+        unsigned long up_txcnt[32];
+        int modem_status[32];
+
+        long baudrate[32];
+        int databits[32];
+        int stopbits[32];
+        int parity[32];
+        int flowctrl[32];
+        int fifo[32];
+        int iftype[32];
+};
+
+struct mxser_board;
+
+struct mxser_port {
+        struct tty_port port;
+        struct mxser_board *board;
+
+        unsigned long ioaddr;
+        unsigned long opmode_ioaddr;
+        int max_baud;
+
+        int rx_high_water;
+        int rx_trigger;         /* Rx fifo trigger level */
+        int rx_low_water;
+        int baud_base;          /* max. speed */
+        int type;               /* UART type */
+
+        int x_char;             /* xon/xoff character */
+        int IER;                /* Interrupt Enable Register */
+        int MCR;                /* Modem control register */
+
+        unsigned char stop_rx;
+        unsigned char ldisc_stop_rx;
+
+        int custom_divisor;
+        unsigned char err_shadow;
+
+        struct async_icount icount; /* kernel counters for 4 input interrupts */
+        int timeout;
+
+        int read_status_mask;
+        int ignore_status_mask;
+        int xmit_fifo_size;
+        int xmit_head;
+        int xmit_tail;
+        int xmit_cnt;
+
+        struct ktermios normal_termios;
+
+        struct mxser_mon mon_data;
+
+        spinlock_t slock;
+};
+
+struct mxser_board {
+        unsigned int idx;
+        int irq;
+        const struct mxser_cardinfo *info;
+        unsigned long vector;
+        unsigned long vector_mask;
+
+        int chip_flag;
+        int uart_type;
+
+        struct mxser_port ports[MXSER_PORTS_PER_BOARD];
+};
+
+struct mxser_mstatus {
+        tcflag_t cflag;
+        int cts;
+        int dsr;
+        int ri;
+        int dcd;
+};
+
+static struct mxser_board mxser_boards[MXSER_BOARDS];
+static struct tty_driver *mxvar_sdriver;
+static struct mxser_log mxvar_log;
+static int mxser_set_baud_method[MXSER_PORTS + 1];
+
+static void mxser_enable_must_enchance_mode(unsigned long baseio)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr |= MOXA_MUST_EFR_EFRB_ENABLE;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+#ifdef  CONFIG_PCI
+static void mxser_disable_must_enchance_mode(unsigned long baseio)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+#endif
+
+static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_BANK_MASK;
+        efr |= MOXA_MUST_EFR_BANK0;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(value, baseio + MOXA_MUST_XON1_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_BANK_MASK;
+        efr |= MOXA_MUST_EFR_BANK0;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_set_must_fifo_value(struct mxser_port *info)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(info->ioaddr + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
+
+        efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_BANK_MASK;
+        efr |= MOXA_MUST_EFR_BANK1;
+
+        outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
+        outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
+        outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
+        outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
+        outb(oldlcr, info->ioaddr + UART_LCR);
+}
+
+static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_BANK_MASK;
+        efr |= MOXA_MUST_EFR_BANK2;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+#ifdef CONFIG_PCI
+static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_BANK_MASK;
+        efr |= MOXA_MUST_EFR_BANK2;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+#endif
+
+static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_SF_MASK;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
+        efr |= MOXA_MUST_EFR_SF_TX1;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
+        efr |= MOXA_MUST_EFR_SF_RX1;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
+{
+        u8 oldlcr;
+        u8 efr;
+
+        oldlcr = inb(baseio + UART_LCR);
+        outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
+
+        efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
+        efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
+
+        outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
+        outb(oldlcr, baseio + UART_LCR);
+}
+
+#ifdef CONFIG_PCI
+static int __devinit CheckIsMoxaMust(unsigned long io)
+{
+        u8 oldmcr, hwid;
+        int i;
+
+        outb(0, io + UART_LCR);
+        mxser_disable_must_enchance_mode(io);
+        oldmcr = inb(io + UART_MCR);
+        outb(0, io + UART_MCR);
+        mxser_set_must_xon1_value(io, 0x11);
+        if ((hwid = inb(io + UART_MCR)) != 0) {
+                outb(oldmcr, io + UART_MCR);
+                return MOXA_OTHER_UART;
+        }
+
+        mxser_get_must_hardware_id(io, &hwid);
+        for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
+                if (hwid == Gpci_uart_info[i].type)
+                        return (int)hwid;
+        }
+        return MOXA_OTHER_UART;
+}
+#endif
+
+static void process_txrx_fifo(struct mxser_port *info)
+{
+        int i;
+
+        if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
+                info->rx_trigger = 1;
+                info->rx_high_water = 1;
+                info->rx_low_water = 1;
+                info->xmit_fifo_size = 1;
+        } else
+                for (i = 0; i < UART_INFO_NUM; i++)
+                        if (info->board->chip_flag == Gpci_uart_info[i].type) {
+                                info->rx_trigger = Gpci_uart_info[i].rx_trigger;
+                                info->rx_low_water = Gpci_uart_info[i].rx_low_water;
+                                info->rx_high_water = Gpci_uart_info[i].rx_high_water;
+                                info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
+                                break;
+                        }
+}
+
+static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
+{
+        static unsigned char mxser_msr[MXSER_PORTS + 1];
+        unsigned char status = 0;
+
+        status = inb(baseaddr + UART_MSR);
+
+        mxser_msr[port] &= 0x0F;
+        mxser_msr[port] |= status;
+        status = mxser_msr[port];
+        if (mode)
+                mxser_msr[port] = 0;
+
+        return status;
+}
+
+static int mxser_carrier_raised(struct tty_port *port)
+{
+        struct mxser_port *mp = container_of(port, struct mxser_port, port);
+        return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
+}
+
+static void mxser_dtr_rts(struct tty_port *port, int on)
+{
+        struct mxser_port *mp = container_of(port, struct mxser_port, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&mp->slock, flags);
+        if (on)
+                outb(inb(mp->ioaddr + UART_MCR) |
+                        UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
+        else
+                outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
+                        mp->ioaddr + UART_MCR);
+        spin_unlock_irqrestore(&mp->slock, flags);
+}
+
+static int mxser_set_baud(struct tty_struct *tty, long newspd)
+{
+        struct mxser_port *info = tty->driver_data;
+        int quot = 0, baud;
+        unsigned char cval;
+
+        if (!info->ioaddr)
+                return -1;
+
+        if (newspd > info->max_baud)
+                return -1;
+
+        if (newspd == 134) {
+                quot = 2 * info->baud_base / 269;
+                tty_encode_baud_rate(tty, 134, 134);
+        } else if (newspd) {
+                quot = info->baud_base / newspd;
+                if (quot == 0)
+                        quot = 1;
+                baud = info->baud_base/quot;
+                tty_encode_baud_rate(tty, baud, baud);
+        } else {
+                quot = 0;
+        }
+
+        info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
+        info->timeout += HZ / 50;       /* Add .02 seconds of slop */
+
+        if (quot) {
+                info->MCR |= UART_MCR_DTR;
+                outb(info->MCR, info->ioaddr + UART_MCR);
+        } else {
+                info->MCR &= ~UART_MCR_DTR;
+                outb(info->MCR, info->ioaddr + UART_MCR);
+                return 0;
+        }
+
+        cval = inb(info->ioaddr + UART_LCR);
+
+        outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
+
+        outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
+        outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
+        outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
+
+#ifdef BOTHER
+        if (C_BAUD(tty) == BOTHER) {
+                quot = info->baud_base % newspd;
+                quot *= 8;
+                if (quot % newspd > newspd / 2) {
+                        quot /= newspd;
+                        quot++;
+                } else
+                        quot /= newspd;
+
+                mxser_set_must_enum_value(info->ioaddr, quot);
+        } else
+#endif
+                mxser_set_must_enum_value(info->ioaddr, 0);
+
+        return 0;
+}
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static int mxser_change_speed(struct tty_struct *tty,
+                                        struct ktermios *old_termios)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned cflag, cval, fcr;
+        int ret = 0;
+        unsigned char status;
+
+        cflag = tty->termios->c_cflag;
+        if (!info->ioaddr)
+                return ret;
+
+        if (mxser_set_baud_method[tty->index] == 0)
+                mxser_set_baud(tty, tty_get_baud_rate(tty));
+
+        /* byte size and parity */
+        switch (cflag & CSIZE) {
+        case CS5:
+                cval = 0x00;
+                break;
+        case CS6:
+                cval = 0x01;
+                break;
+        case CS7:
+                cval = 0x02;
+                break;
+        case CS8:
+                cval = 0x03;
+                break;
+        default:
+                cval = 0x00;
+                break;          /* too keep GCC shut... */
+        }
+        if (cflag & CSTOPB)
+                cval |= 0x04;
+        if (cflag & PARENB)
+                cval |= UART_LCR_PARITY;
+        if (!(cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+        if (cflag & CMSPAR)
+                cval |= UART_LCR_SPAR;
+
+        if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
+                if (info->board->chip_flag) {
+                        fcr = UART_FCR_ENABLE_FIFO;
+                        fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
+                        mxser_set_must_fifo_value(info);
+                } else
+                        fcr = 0;
+        } else {
+                fcr = UART_FCR_ENABLE_FIFO;
+                if (info->board->chip_flag) {
+                        fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
+                        mxser_set_must_fifo_value(info);
+                } else {
+                        switch (info->rx_trigger) {
+                        case 1:
+                                fcr |= UART_FCR_TRIGGER_1;
+                                break;
+                        case 4:
+                                fcr |= UART_FCR_TRIGGER_4;
+                                break;
+                        case 8:
+                                fcr |= UART_FCR_TRIGGER_8;
+                                break;
+                        default:
+                                fcr |= UART_FCR_TRIGGER_14;
+                                break;
+                        }
+                }
+        }
+
+        /* CTS flow control flag and modem status interrupts */
+        info->IER &= ~UART_IER_MSI;
+        info->MCR &= ~UART_MCR_AFE;
+        if (cflag & CRTSCTS) {
+                info->port.flags |= ASYNC_CTS_FLOW;
+                info->IER |= UART_IER_MSI;
+                if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
+                        info->MCR |= UART_MCR_AFE;
+                } else {
+                        status = inb(info->ioaddr + UART_MSR);
+                        if (tty->hw_stopped) {
+                                if (status & UART_MSR_CTS) {
+                                        tty->hw_stopped = 0;
+                                        if (info->type != PORT_16550A &&
+                                                        !info->board->chip_flag) {
+                                                outb(info->IER & ~UART_IER_THRI,
+                                                        info->ioaddr +
+                                                        UART_IER);
+                                                info->IER |= UART_IER_THRI;
+                                                outb(info->IER, info->ioaddr +
+                                                                UART_IER);
+                                        }
+                                        tty_wakeup(tty);
+                                }
+                        } else {
+                                if (!(status & UART_MSR_CTS)) {
+                                        tty->hw_stopped = 1;
+                                        if ((info->type != PORT_16550A) &&
+                                                        (!info->board->chip_flag)) {
+                                                info->IER &= ~UART_IER_THRI;
+                                                outb(info->IER, info->ioaddr +
+                                                                UART_IER);
+                                        }
+                                }
+                        }
+                }
+        } else {
+                info->port.flags &= ~ASYNC_CTS_FLOW;
+        }
+        outb(info->MCR, info->ioaddr + UART_MCR);
+        if (cflag & CLOCAL) {
+                info->port.flags &= ~ASYNC_CHECK_CD;
+        } else {
+                info->port.flags |= ASYNC_CHECK_CD;
+                info->IER |= UART_IER_MSI;
+        }
+        outb(info->IER, info->ioaddr + UART_IER);
+
+        /*
+         * Set up parity check flag
+         */
+        info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+        if (I_INPCK(tty))
+                info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (I_BRKINT(tty) || I_PARMRK(tty))
+                info->read_status_mask |= UART_LSR_BI;
+
+        info->ignore_status_mask = 0;
+
+        if (I_IGNBRK(tty)) {
+                info->ignore_status_mask |= UART_LSR_BI;
+                info->read_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignore parity and break indicators, ignore
+                 * overruns too.  (For real raw support).
+                 */
+                if (I_IGNPAR(tty)) {
+                        info->ignore_status_mask |=
+                                                UART_LSR_OE |
+                                                UART_LSR_PE |
+                                                UART_LSR_FE;
+                        info->read_status_mask |=
+                                                UART_LSR_OE |
+                                                UART_LSR_PE |
+                                                UART_LSR_FE;
+                }
+        }
+        if (info->board->chip_flag) {
+                mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
+                mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
+                if (I_IXON(tty)) {
+                        mxser_enable_must_rx_software_flow_control(
+                                        info->ioaddr);
+                } else {
+                        mxser_disable_must_rx_software_flow_control(
+                                        info->ioaddr);
+                }
+                if (I_IXOFF(tty)) {
+                        mxser_enable_must_tx_software_flow_control(
+                                        info->ioaddr);
+                } else {
+                        mxser_disable_must_tx_software_flow_control(
+                                        info->ioaddr);
+                }
+        }
+
+
+        outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
+        outb(cval, info->ioaddr + UART_LCR);
+
+        return ret;
+}
+
+static void mxser_check_modem_status(struct tty_struct *tty,
+                                struct mxser_port *port, int status)
+{
+        /* update input line counters */
+        if (status & UART_MSR_TERI)
+                port->icount.rng++;
+        if (status & UART_MSR_DDSR)
+                port->icount.dsr++;
+        if (status & UART_MSR_DDCD)
+                port->icount.dcd++;
+        if (status & UART_MSR_DCTS)
+                port->icount.cts++;
+        port->mon_data.modem_status = status;
+        wake_up_interruptible(&port->port.delta_msr_wait);
+
+        if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
+                if (status & UART_MSR_DCD)
+                        wake_up_interruptible(&port->port.open_wait);
+        }
+
+        if (port->port.flags & ASYNC_CTS_FLOW) {
+                if (tty->hw_stopped) {
+                        if (status & UART_MSR_CTS) {
+                                tty->hw_stopped = 0;
+
+                                if ((port->type != PORT_16550A) &&
+                                                (!port->board->chip_flag)) {
+                                        outb(port->IER & ~UART_IER_THRI,
+                                                port->ioaddr + UART_IER);
+                                        port->IER |= UART_IER_THRI;
+                                        outb(port->IER, port->ioaddr +
+                                                        UART_IER);
+                                }
+                                tty_wakeup(tty);
+                        }
+                } else {
+                        if (!(status & UART_MSR_CTS)) {
+                                tty->hw_stopped = 1;
+                                if (port->type != PORT_16550A &&
+                                                !port->board->chip_flag) {
+                                        port->IER &= ~UART_IER_THRI;
+                                        outb(port->IER, port->ioaddr +
+                                                        UART_IER);
+                                }
+                        }
+                }
+        }
+}
+
+static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
+{
+        struct mxser_port *info = container_of(port, struct mxser_port, port);
+        unsigned long page;
+        unsigned long flags;
+
+        page = __get_free_page(GFP_KERNEL);
+        if (!page)
+                return -ENOMEM;
+
+        spin_lock_irqsave(&info->slock, flags);
+
+        if (!info->ioaddr || !info->type) {
+                set_bit(TTY_IO_ERROR, &tty->flags);
+                free_page(page);
+                spin_unlock_irqrestore(&info->slock, flags);
+                return 0;
+        }
+        info->port.xmit_buf = (unsigned char *) page;
+
+        /*
+         * Clear the FIFO buffers and disable them
+         * (they will be reenabled in mxser_change_speed())
+         */
+        if (info->board->chip_flag)
+                outb((UART_FCR_CLEAR_RCVR |
+                        UART_FCR_CLEAR_XMIT |
+                        MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
+        else
+                outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
+                        info->ioaddr + UART_FCR);
+
+        /*
+         * At this point there's no way the LSR could still be 0xFF;
+         * if it is, then bail out, because there's likely no UART
+         * here.
+         */
+        if (inb(info->ioaddr + UART_LSR) == 0xff) {
+                spin_unlock_irqrestore(&info->slock, flags);
+                if (capable(CAP_SYS_ADMIN)) {
+                        set_bit(TTY_IO_ERROR, &tty->flags);
+                        return 0;
+                } else
+                        return -ENODEV;
+        }
+
+        /*
+         * Clear the interrupt registers.
+         */
+        (void) inb(info->ioaddr + UART_LSR);
+        (void) inb(info->ioaddr + UART_RX);
+        (void) inb(info->ioaddr + UART_IIR);
+        (void) inb(info->ioaddr + UART_MSR);
+
+        /*
+         * Now, initialize the UART
+         */
+        outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
+        info->MCR = UART_MCR_DTR | UART_MCR_RTS;
+        outb(info->MCR, info->ioaddr + UART_MCR);
+
+        /*
+         * Finally, enable interrupts
+         */
+        info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
+
+        if (info->board->chip_flag)
+                info->IER |= MOXA_MUST_IER_EGDAI;
+        outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
+
+        /*
+         * And clear the interrupt registers again for luck.
+         */
+        (void) inb(info->ioaddr + UART_LSR);
+        (void) inb(info->ioaddr + UART_RX);
+        (void) inb(info->ioaddr + UART_IIR);
+        (void) inb(info->ioaddr + UART_MSR);
+
+        clear_bit(TTY_IO_ERROR, &tty->flags);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+        /*
+         * and set the speed of the serial port
+         */
+        mxser_change_speed(tty, NULL);
+        spin_unlock_irqrestore(&info->slock, flags);
+
+        return 0;
+}
+
+/*
+ * This routine will shutdown a serial port
+ */
+static void mxser_shutdown_port(struct tty_port *port)
+{
+        struct mxser_port *info = container_of(port, struct mxser_port, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->slock, flags);
+
+        /*
+         * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+         * here so the queue might never be waken up
+         */
+        wake_up_interruptible(&info->port.delta_msr_wait);
+
+        /*
+         * Free the xmit buffer, if necessary
+         */
+        if (info->port.xmit_buf) {
+                free_page((unsigned long) info->port.xmit_buf);
+                info->port.xmit_buf = NULL;
+        }
+
+        info->IER = 0;
+        outb(0x00, info->ioaddr + UART_IER);
+
+        /* clear Rx/Tx FIFO's */
+        if (info->board->chip_flag)
+                outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
+                                MOXA_MUST_FCR_GDA_MODE_ENABLE,
+                                info->ioaddr + UART_FCR);
+        else
+                outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+                        info->ioaddr + UART_FCR);
+
+        /* read data port to reset things */
+        (void) inb(info->ioaddr + UART_RX);
+
+
+        if (info->board->chip_flag)
+                SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
+
+        spin_unlock_irqrestore(&info->slock, flags);
+}
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain.   It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int mxser_open(struct tty_struct *tty, struct file *filp)
+{
+        struct mxser_port *info;
+        int line;
+
+        line = tty->index;
+        if (line == MXSER_PORTS)
+                return 0;
+        if (line < 0 || line > MXSER_PORTS)
+                return -ENODEV;
+        info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
+        if (!info->ioaddr)
+                return -ENODEV;
+
+        tty->driver_data = info;
+        return tty_port_open(&info->port, tty, filp);
+}
+
+static void mxser_flush_buffer(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+        char fcr;
+        unsigned long flags;
+
+
+        spin_lock_irqsave(&info->slock, flags);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+        fcr = inb(info->ioaddr + UART_FCR);
+        outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
+                info->ioaddr + UART_FCR);
+        outb(fcr, info->ioaddr + UART_FCR);
+
+        spin_unlock_irqrestore(&info->slock, flags);
+
+        tty_wakeup(tty);
+}
+
+
+static void mxser_close_port(struct tty_port *port)
+{
+        struct mxser_port *info = container_of(port, struct mxser_port, port);
+        unsigned long timeout;
+        /*
+         * At this point we stop accepting input.  To do this, we
+         * disable the receive line status interrupts, and tell the
+         * interrupt driver to stop checking the data ready bit in the
+         * line status register.
+         */
+        info->IER &= ~UART_IER_RLSI;
+        if (info->board->chip_flag)
+                info->IER &= ~MOXA_MUST_RECV_ISR;
+
+        outb(info->IER, info->ioaddr + UART_IER);
+        /*
+         * Before we drop DTR, make sure the UART transmitter
+         * has completely drained; this is especially
+         * important if there is a transmit FIFO!
+         */
+        timeout = jiffies + HZ;
+        while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
+                schedule_timeout_interruptible(5);
+                if (time_after(jiffies, timeout))
+                        break;
+        }
+}
+
+/*
+ * This routine is called when the serial port gets closed.  First, we
+ * wait for the last remaining data to be sent.  Then, we unlink its
+ * async structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ */
+static void mxser_close(struct tty_struct *tty, struct file *filp)
+{
+        struct mxser_port *info = tty->driver_data;
+        struct tty_port *port = &info->port;
+
+        if (tty->index == MXSER_PORTS || info == NULL)
+                return;
+        if (tty_port_close_start(port, tty, filp) == 0)
+                return;
+        mutex_lock(&port->mutex);
+        mxser_close_port(port);
+        mxser_flush_buffer(tty);
+        mxser_shutdown_port(port);
+        clear_bit(ASYNCB_INITIALIZED, &port->flags);
+        mutex_unlock(&port->mutex);
+        /* Right now the tty_port set is done outside of the close_end helper
+           as we don't yet have everyone using refcounts */     
+        tty_port_close_end(port, tty);
+        tty_port_tty_set(port, NULL);
+}
+
+static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+        int c, total = 0;
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+        if (!info->port.xmit_buf)
+                return 0;
+
+        while (1) {
+                c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+                                          SERIAL_XMIT_SIZE - info->xmit_head));
+                if (c <= 0)
+                        break;
+
+                memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
+                spin_lock_irqsave(&info->slock, flags);
+                info->xmit_head = (info->xmit_head + c) &
+                                  (SERIAL_XMIT_SIZE - 1);
+                info->xmit_cnt += c;
+                spin_unlock_irqrestore(&info->slock, flags);
+
+                buf += c;
+                count -= c;
+                total += c;
+        }
+
+        if (info->xmit_cnt && !tty->stopped) {
+                if (!tty->hw_stopped ||
+                                (info->type == PORT_16550A) ||
+                                (info->board->chip_flag)) {
+                        spin_lock_irqsave(&info->slock, flags);
+                        outb(info->IER & ~UART_IER_THRI, info->ioaddr +
+                                        UART_IER);
+                        info->IER |= UART_IER_THRI;
+                        outb(info->IER, info->ioaddr + UART_IER);
+                        spin_unlock_irqrestore(&info->slock, flags);
+                }
+        }
+        return total;
+}
+
+static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+        if (!info->port.xmit_buf)
+                return 0;
+
+        if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
+                return 0;
+
+        spin_lock_irqsave(&info->slock, flags);
+        info->port.xmit_buf[info->xmit_head++] = ch;
+        info->xmit_head &= SERIAL_XMIT_SIZE - 1;
+        info->xmit_cnt++;
+        spin_unlock_irqrestore(&info->slock, flags);
+        if (!tty->stopped) {
+                if (!tty->hw_stopped ||
+                                (info->type == PORT_16550A) ||
+                                info->board->chip_flag) {
+                        spin_lock_irqsave(&info->slock, flags);
+                        outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
+                        info->IER |= UART_IER_THRI;
+                        outb(info->IER, info->ioaddr + UART_IER);
+                        spin_unlock_irqrestore(&info->slock, flags);
+                }
+        }
+        return 1;
+}
+
+
+static void mxser_flush_chars(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+        if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
+                        (tty->hw_stopped && info->type != PORT_16550A &&
+                         !info->board->chip_flag))
+                return;
+
+        spin_lock_irqsave(&info->slock, flags);
+
+        outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
+        info->IER |= UART_IER_THRI;
+        outb(info->IER, info->ioaddr + UART_IER);
+
+        spin_unlock_irqrestore(&info->slock, flags);
+}
+
+static int mxser_write_room(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+        int ret;
+
+        ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+        return ret < 0 ? 0 : ret;
+}
+
+static int mxser_chars_in_buffer(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+        return info->xmit_cnt;
+}
+
+/*
+ * ------------------------------------------------------------
+ * friends of mxser_ioctl()
+ * ------------------------------------------------------------
+ */
+static int mxser_get_serial_info(struct tty_struct *tty,
+                struct serial_struct __user *retinfo)
+{
+        struct mxser_port *info = tty->driver_data;
+        struct serial_struct tmp = {
+                .type = info->type,
+                .line = tty->index,
+                .port = info->ioaddr,
+                .irq = info->board->irq,
+                .flags = info->port.flags,
+                .baud_base = info->baud_base,
+                .close_delay = info->port.close_delay,
+                .closing_wait = info->port.closing_wait,
+                .custom_divisor = info->custom_divisor,
+                .hub6 = 0
+        };
+        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+                return -EFAULT;
+        return 0;
+}
+
+static int mxser_set_serial_info(struct tty_struct *tty,
+                struct serial_struct __user *new_info)
+{
+        struct mxser_port *info = tty->driver_data;
+        struct tty_port *port = &info->port;
+        struct serial_struct new_serial;
+        speed_t baud;
+        unsigned long sl_flags;
+        unsigned int flags;
+        int retval = 0;
+
+        if (!new_info || !info->ioaddr)
+                return -ENODEV;
+        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+                return -EFAULT;
+
+        if (new_serial.irq != info->board->irq ||
+                        new_serial.port != info->ioaddr)
+                return -EINVAL;
+
+        flags = port->flags & ASYNC_SPD_MASK;
+
+        if (!capable(CAP_SYS_ADMIN)) {
+                if ((new_serial.baud_base != info->baud_base) ||
+                                (new_serial.close_delay != info->port.close_delay) ||
+                                ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
+                        return -EPERM;
+                info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
+                                (new_serial.flags & ASYNC_USR_MASK));
+        } else {
+                /*
+                 * OK, past this point, all the error checking has been done.
+                 * At this point, we start making changes.....
+                 */
+                port->flags = ((port->flags & ~ASYNC_FLAGS) |
+                                (new_serial.flags & ASYNC_FLAGS));
+                port->close_delay = new_serial.close_delay * HZ / 100;
+                port->closing_wait = new_serial.closing_wait * HZ / 100;
+                tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+                if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
+                                (new_serial.baud_base != info->baud_base ||
+                                new_serial.custom_divisor !=
+                                info->custom_divisor)) {
+                        if (new_serial.custom_divisor == 0)
+                                return -EINVAL;
+                        baud = new_serial.baud_base / new_serial.custom_divisor;
+                        tty_encode_baud_rate(tty, baud, baud);
+                }
+        }
+
+        info->type = new_serial.type;
+
+        process_txrx_fifo(info);
+
+        if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+                if (flags != (port->flags & ASYNC_SPD_MASK)) {
+                        spin_lock_irqsave(&info->slock, sl_flags);
+                        mxser_change_speed(tty, NULL);
+                        spin_unlock_irqrestore(&info->slock, sl_flags);
+                }
+        } else {
+                retval = mxser_activate(port, tty);
+                if (retval == 0)
+                        set_bit(ASYNCB_INITIALIZED, &port->flags);
+        }
+        return retval;
+}
+
+/*
+ * mxser_get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space.
+ */
+static int mxser_get_lsr_info(struct mxser_port *info,
+                unsigned int __user *value)
+{
+        unsigned char status;
+        unsigned int result;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->slock, flags);
+        status = inb(info->ioaddr + UART_LSR);
+        spin_unlock_irqrestore(&info->slock, flags);
+        result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
+        return put_user(result, value);
+}
+
+static int mxser_tiocmget(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned char control, status;
+        unsigned long flags;
+
+
+        if (tty->index == MXSER_PORTS)
+                return -ENOIOCTLCMD;
+        if (test_bit(TTY_IO_ERROR, &tty->flags))
+                return -EIO;
+
+        control = info->MCR;
+
+        spin_lock_irqsave(&info->slock, flags);
+        status = inb(info->ioaddr + UART_MSR);
+        if (status & UART_MSR_ANY_DELTA)
+                mxser_check_modem_status(tty, info, status);
+        spin_unlock_irqrestore(&info->slock, flags);
+        return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
+                    ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
+                    ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
+                    ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
+                    ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
+                    ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
+}
+
+static int mxser_tiocmset(struct tty_struct *tty,
+                unsigned int set, unsigned int clear)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+
+        if (tty->index == MXSER_PORTS)
+                return -ENOIOCTLCMD;
+        if (test_bit(TTY_IO_ERROR, &tty->flags))
+                return -EIO;
+
+        spin_lock_irqsave(&info->slock, flags);
+
+        if (set & TIOCM_RTS)
+                info->MCR |= UART_MCR_RTS;
+        if (set & TIOCM_DTR)
+                info->MCR |= UART_MCR_DTR;
+
+        if (clear & TIOCM_RTS)
+                info->MCR &= ~UART_MCR_RTS;
+        if (clear & TIOCM_DTR)
+                info->MCR &= ~UART_MCR_DTR;
+
+        outb(info->MCR, info->ioaddr + UART_MCR);
+        spin_unlock_irqrestore(&info->slock, flags);
+        return 0;
+}
+
+static int __init mxser_program_mode(int port)
+{
+        int id, i, j, n;
+
+        outb(0, port);
+        outb(0, port);
+        outb(0, port);
+        (void)inb(port);
+        (void)inb(port);
+        outb(0, port);
+        (void)inb(port);
+
+        id = inb(port + 1) & 0x1F;
+        if ((id != C168_ASIC_ID) &&
+                        (id != C104_ASIC_ID) &&
+                        (id != C102_ASIC_ID) &&
+                        (id != CI132_ASIC_ID) &&
+                        (id != CI134_ASIC_ID) &&
+                        (id != CI104J_ASIC_ID))
+                return -1;
+        for (i = 0, j = 0; i < 4; i++) {
+                n = inb(port + 2);
+                if (n == 'M') {
+                        j = 1;
+                } else if ((j == 1) && (n == 1)) {
+                        j = 2;
+                        break;
+                } else
+                        j = 0;
+        }
+        if (j != 2)
+                id = -2;
+        return id;
+}
+
+static void __init mxser_normal_mode(int port)
+{
+        int i, n;
+
+        outb(0xA5, port + 1);
+        outb(0x80, port + 3);
+        outb(12, port + 0);     /* 9600 bps */
+        outb(0, port + 1);
+        outb(0x03, port + 3);   /* 8 data bits */
+        outb(0x13, port + 4);   /* loop back mode */
+        for (i = 0; i < 16; i++) {
+                n = inb(port + 5);
+                if ((n & 0x61) == 0x60)
+                        break;
+                if ((n & 1) == 1)
+                        (void)inb(port);
+        }
+        outb(0x00, port + 4);
+}
+
+#define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
+#define CHIP_DO         0x02    /* Serial Data Output in Eprom */
+#define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
+#define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
+#define EN_CCMD         0x000   /* Chip's command register     */
+#define EN0_RSARLO      0x008   /* Remote start address reg 0  */
+#define EN0_RSARHI      0x009   /* Remote start address reg 1  */
+#define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
+#define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
+#define EN0_DCFG        0x00E   /* Data configuration reg WR   */
+#define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
+#define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
+#define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
+static int __init mxser_read_register(int port, unsigned short *regs)
+{
+        int i, k, value, id;
+        unsigned int j;
+
+        id = mxser_program_mode(port);
+        if (id < 0)
+                return id;
+        for (i = 0; i < 14; i++) {
+                k = (i & 0x3F) | 0x180;
+                for (j = 0x100; j > 0; j >>= 1) {
+                        outb(CHIP_CS, port);
+                        if (k & j) {
+                                outb(CHIP_CS | CHIP_DO, port);
+                                outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
+                        } else {
+                                outb(CHIP_CS, port);
+                                outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
+                        }
+                }
+                (void)inb(port);
+                value = 0;
+                for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
+                        outb(CHIP_CS, port);
+                        outb(CHIP_CS | CHIP_SK, port);
+                        if (inb(port) & CHIP_DI)
+                                value |= j;
+                }
+                regs[i] = value;
+                outb(0, port);
+        }
+        mxser_normal_mode(port);
+        return id;
+}
+
+static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
+{
+        struct mxser_port *ip;
+        struct tty_port *port;
+        struct tty_struct *tty;
+        int result, status;
+        unsigned int i, j;
+        int ret = 0;
+
+        switch (cmd) {
+        case MOXA_GET_MAJOR:
+                if (printk_ratelimit())
+                        printk(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
+                                        "%x (GET_MAJOR), fix your userspace\n",
+                                        current->comm, cmd);
+                return put_user(ttymajor, (int __user *)argp);
+
+        case MOXA_CHKPORTENABLE:
+                result = 0;
+                for (i = 0; i < MXSER_BOARDS; i++)
+                        for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
+                                if (mxser_boards[i].ports[j].ioaddr)
+                                        result |= (1 << i);
+                return put_user(result, (unsigned long __user *)argp);
+        case MOXA_GETDATACOUNT:
+                /* The receive side is locked by port->slock but it isn't
+                   clear that an exact snapshot is worth copying here */
+                if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
+                        ret = -EFAULT;
+                return ret;
+        case MOXA_GETMSTATUS: {
+                struct mxser_mstatus ms, __user *msu = argp;
+                for (i = 0; i < MXSER_BOARDS; i++)
+                        for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
+                                ip = &mxser_boards[i].ports[j];
+                                port = &ip->port;
+                                memset(&ms, 0, sizeof(ms));
+
+                                mutex_lock(&port->mutex);
+                                if (!ip->ioaddr)
+                                        goto copy;
+                                
+                                tty = tty_port_tty_get(port);
+
+                                if (!tty || !tty->termios)
+                                        ms.cflag = ip->normal_termios.c_cflag;
+                                else
+                                        ms.cflag = tty->termios->c_cflag;
+                                tty_kref_put(tty);
+                                spin_lock_irq(&ip->slock);
+                                status = inb(ip->ioaddr + UART_MSR);
+                                spin_unlock_irq(&ip->slock);
+                                if (status & UART_MSR_DCD)
+                                        ms.dcd = 1;
+                                if (status & UART_MSR_DSR)
+                                        ms.dsr = 1;
+                                if (status & UART_MSR_CTS)
+                                        ms.cts = 1;
+                        copy:
+                                mutex_unlock(&port->mutex);
+                                if (copy_to_user(msu, &ms, sizeof(ms)))
+                                        return -EFAULT;
+                                msu++;
+                        }
+                return 0;
+        }
+        case MOXA_ASPP_MON_EXT: {
+                struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
+                unsigned int cflag, iflag, p;
+                u8 opmode;
+
+                me = kzalloc(sizeof(*me), GFP_KERNEL);
+                if (!me)
+                        return -ENOMEM;
+
+                for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
+                        for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
+                                if (p >= ARRAY_SIZE(me->rx_cnt)) {
+                                        i = MXSER_BOARDS;
+                                        break;
+                                }
+                                ip = &mxser_boards[i].ports[j];
+                                port = &ip->port;
+
+                                mutex_lock(&port->mutex);
+                                if (!ip->ioaddr) {
+                                        mutex_unlock(&port->mutex);
+                                        continue;
+                                }
+
+                                spin_lock_irq(&ip->slock);
+                                status = mxser_get_msr(ip->ioaddr, 0, p);
+
+                                if (status & UART_MSR_TERI)
+                                        ip->icount.rng++;
+                                if (status & UART_MSR_DDSR)
+                                        ip->icount.dsr++;
+                                if (status & UART_MSR_DDCD)
+                                        ip->icount.dcd++;
+                                if (status & UART_MSR_DCTS)
+                                        ip->icount.cts++;
+
+                                ip->mon_data.modem_status = status;
+                                me->rx_cnt[p] = ip->mon_data.rxcnt;
+                                me->tx_cnt[p] = ip->mon_data.txcnt;
+                                me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
+                                me->up_txcnt[p] = ip->mon_data.up_txcnt;
+                                me->modem_status[p] =
+                                        ip->mon_data.modem_status;
+                                spin_unlock_irq(&ip->slock);
+
+                                tty = tty_port_tty_get(&ip->port);
+
+                                if (!tty || !tty->termios) {
+                                        cflag = ip->normal_termios.c_cflag;
+                                        iflag = ip->normal_termios.c_iflag;
+                                        me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
+                                } else {
+                                        cflag = tty->termios->c_cflag;
+                                        iflag = tty->termios->c_iflag;
+                                        me->baudrate[p] = tty_get_baud_rate(tty);
+                                }
+                                tty_kref_put(tty);
+
+                                me->databits[p] = cflag & CSIZE;
+                                me->stopbits[p] = cflag & CSTOPB;
+                                me->parity[p] = cflag & (PARENB | PARODD |
+                                                CMSPAR);
+
+                                if (cflag & CRTSCTS)
+                                        me->flowctrl[p] |= 0x03;
+
+                                if (iflag & (IXON | IXOFF))
+                                        me->flowctrl[p] |= 0x0C;
+
+                                if (ip->type == PORT_16550A)
+                                        me->fifo[p] = 1;
+
+                                opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
+                                opmode &= OP_MODE_MASK;
+                                me->iftype[p] = opmode;
+                                mutex_unlock(&port->mutex);
+                        }
+                }
+                if (copy_to_user(argp, me, sizeof(*me)))
+                        ret = -EFAULT;
+                kfree(me);
+                return ret;
+        }
+        default:
+                return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
+                struct async_icount *cprev)
+{
+        struct async_icount cnow;
+        unsigned long flags;
+        int ret;
+
+        spin_lock_irqsave(&info->slock, flags);
+        cnow = info->icount;    /* atomic copy */
+        spin_unlock_irqrestore(&info->slock, flags);
+
+        ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
+                ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
+                ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
+                ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
+
+        *cprev = cnow;
+
+        return ret;
+}
+
+static int mxser_ioctl(struct tty_struct *tty,
+                unsigned int cmd, unsigned long arg)
+{
+        struct mxser_port *info = tty->driver_data;
+        struct tty_port *port = &info->port;
+        struct async_icount cnow;
+        unsigned long flags;
+        void __user *argp = (void __user *)arg;
+        int retval;
+
+        if (tty->index == MXSER_PORTS)
+                return mxser_ioctl_special(cmd, argp);
+
+        if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
+                int p;
+                unsigned long opmode;
+                static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
+                int shiftbit;
+                unsigned char val, mask;
+
+                p = tty->index % 4;
+                if (cmd == MOXA_SET_OP_MODE) {
+                        if (get_user(opmode, (int __user *) argp))
+                                return -EFAULT;
+                        if (opmode != RS232_MODE &&
+                                        opmode != RS485_2WIRE_MODE &&
+                                        opmode != RS422_MODE &&
+                                        opmode != RS485_4WIRE_MODE)
+                                return -EFAULT;
+                        mask = ModeMask[p];
+                        shiftbit = p * 2;
+                        spin_lock_irq(&info->slock);
+                        val = inb(info->opmode_ioaddr);
+                        val &= mask;
+                        val |= (opmode << shiftbit);
+                        outb(val, info->opmode_ioaddr);
+                        spin_unlock_irq(&info->slock);
+                } else {
+                        shiftbit = p * 2;
+                        spin_lock_irq(&info->slock);
+                        opmode = inb(info->opmode_ioaddr) >> shiftbit;
+                        spin_unlock_irq(&info->slock);
+                        opmode &= OP_MODE_MASK;
+                        if (put_user(opmode, (int __user *)argp))
+                                return -EFAULT;
+                }
+                return 0;
+        }
+
+        if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT &&
+                        test_bit(TTY_IO_ERROR, &tty->flags))
+                return -EIO;
+
+        switch (cmd) {
+        case TIOCGSERIAL:
+                mutex_lock(&port->mutex);
+                retval = mxser_get_serial_info(tty, argp);
+                mutex_unlock(&port->mutex);
+                return retval;
+        case TIOCSSERIAL:
+                mutex_lock(&port->mutex);
+                retval = mxser_set_serial_info(tty, argp);
+                mutex_unlock(&port->mutex);
+                return retval;
+        case TIOCSERGETLSR:     /* Get line status register */
+                return  mxser_get_lsr_info(info, argp);
+                /*
+                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+                 * - mask passed in arg for lines of interest
+                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+                 * Caller should use TIOCGICOUNT to see which one it was
+                 */
+        case TIOCMIWAIT:
+                spin_lock_irqsave(&info->slock, flags);
+                cnow = info->icount;    /* note the counters on entry */
+                spin_unlock_irqrestore(&info->slock, flags);
+
+                return wait_event_interruptible(info->port.delta_msr_wait,
+                                mxser_cflags_changed(info, arg, &cnow));
+        case MOXA_HighSpeedOn:
+                return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
+        case MOXA_SDS_RSTICOUNTER:
+                spin_lock_irq(&info->slock);
+                info->mon_data.rxcnt = 0;
+                info->mon_data.txcnt = 0;
+                spin_unlock_irq(&info->slock);
+                return 0;
+
+        case MOXA_ASPP_OQUEUE:{
+                int len, lsr;
+
+                len = mxser_chars_in_buffer(tty);
+                spin_lock_irq(&info->slock);
+                lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
+                spin_unlock_irq(&info->slock);
+                len += (lsr ? 0 : 1);
+
+                return put_user(len, (int __user *)argp);
+        }
+        case MOXA_ASPP_MON: {
+                int mcr, status;
+
+                spin_lock_irq(&info->slock);
+                status = mxser_get_msr(info->ioaddr, 1, tty->index);
+                mxser_check_modem_status(tty, info, status);
+
+                mcr = inb(info->ioaddr + UART_MCR);
+                spin_unlock_irq(&info->slock);
+
+                if (mcr & MOXA_MUST_MCR_XON_FLAG)
+                        info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
+                else
+                        info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
+
+                if (mcr & MOXA_MUST_MCR_TX_XON)
+                        info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
+                else
+                        info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
+
+                if (tty->hw_stopped)
+                        info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
+                else
+                        info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
+
+                if (copy_to_user(argp, &info->mon_data,
+                                sizeof(struct mxser_mon)))
+                        return -EFAULT;
+
+                return 0;
+        }
+        case MOXA_ASPP_LSTATUS: {
+                if (put_user(info->err_shadow, (unsigned char __user *)argp))
+                        return -EFAULT;
+
+                info->err_shadow = 0;
+                return 0;
+        }
+        case MOXA_SET_BAUD_METHOD: {
+                int method;
+
+                if (get_user(method, (int __user *)argp))
+                        return -EFAULT;
+                mxser_set_baud_method[tty->index] = method;
+                return put_user(method, (int __user *)argp);
+        }
+        default:
+                return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+        /*
+         * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+         * Return: write counters to the user passed counter struct
+         * NB: both 1->0 and 0->1 transitions are counted except for
+         *     RI where only 0->1 is counted.
+         */
+
+static int mxser_get_icount(struct tty_struct *tty,
+                struct serial_icounter_struct *icount)
+
+{
+        struct mxser_port *info = tty->driver_data;
+        struct async_icount cnow;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->slock, flags);
+        cnow = info->icount;
+        spin_unlock_irqrestore(&info->slock, flags);
+
+        icount->frame = cnow.frame;
+        icount->brk = cnow.brk;
+        icount->overrun = cnow.overrun;
+        icount->buf_overrun = cnow.buf_overrun;
+        icount->parity = cnow.parity;
+        icount->rx = cnow.rx;
+        icount->tx = cnow.tx;
+        icount->cts = cnow.cts;
+        icount->dsr = cnow.dsr;
+        icount->rng = cnow.rng;
+        icount->dcd = cnow.dcd;
+        return 0;
+}
+
+static void mxser_stoprx(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+
+        info->ldisc_stop_rx = 1;
+        if (I_IXOFF(tty)) {
+                if (info->board->chip_flag) {
+                        info->IER &= ~MOXA_MUST_RECV_ISR;
+                        outb(info->IER, info->ioaddr + UART_IER);
+                } else {
+                        info->x_char = STOP_CHAR(tty);
+                        outb(0, info->ioaddr + UART_IER);
+                        info->IER |= UART_IER_THRI;
+                        outb(info->IER, info->ioaddr + UART_IER);
+                }
+        }
+
+        if (tty->termios->c_cflag & CRTSCTS) {
+                info->MCR &= ~UART_MCR_RTS;
+                outb(info->MCR, info->ioaddr + UART_MCR);
+        }
+}
+
+/*
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ */
+static void mxser_throttle(struct tty_struct *tty)
+{
+        mxser_stoprx(tty);
+}
+
+static void mxser_unthrottle(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+
+        /* startrx */
+        info->ldisc_stop_rx = 0;
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else {
+                        if (info->board->chip_flag) {
+                                info->IER |= MOXA_MUST_RECV_ISR;
+                                outb(info->IER, info->ioaddr + UART_IER);
+                        } else {
+                                info->x_char = START_CHAR(tty);
+                                outb(0, info->ioaddr + UART_IER);
+                                info->IER |= UART_IER_THRI;
+                                outb(info->IER, info->ioaddr + UART_IER);
+                        }
+                }
+        }
+
+        if (tty->termios->c_cflag & CRTSCTS) {
+                info->MCR |= UART_MCR_RTS;
+                outb(info->MCR, info->ioaddr + UART_MCR);
+        }
+}
+
+/*
+ * mxser_stop() and mxser_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ */
+static void mxser_stop(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->slock, flags);
+        if (info->IER & UART_IER_THRI) {
+                info->IER &= ~UART_IER_THRI;
+                outb(info->IER, info->ioaddr + UART_IER);
+        }
+        spin_unlock_irqrestore(&info->slock, flags);
+}
+
+static void mxser_start(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->slock, flags);
+        if (info->xmit_cnt && info->port.xmit_buf) {
+                outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
+                info->IER |= UART_IER_THRI;
+                outb(info->IER, info->ioaddr + UART_IER);
+        }
+        spin_unlock_irqrestore(&info->slock, flags);
+}
+
+static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->slock, flags);
+        mxser_change_speed(tty, old_termios);
+        spin_unlock_irqrestore(&info->slock, flags);
+
+        if ((old_termios->c_cflag & CRTSCTS) &&
+                        !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                mxser_start(tty);
+        }
+
+        /* Handle sw stopped */
+        if ((old_termios->c_iflag & IXON) &&
+                        !(tty->termios->c_iflag & IXON)) {
+                tty->stopped = 0;
+
+                if (info->board->chip_flag) {
+                        spin_lock_irqsave(&info->slock, flags);
+                        mxser_disable_must_rx_software_flow_control(
+                                        info->ioaddr);
+                        spin_unlock_irqrestore(&info->slock, flags);
+                }
+
+                mxser_start(tty);
+        }
+}
+
+/*
+ * mxser_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long orig_jiffies, char_time;
+        unsigned long flags;
+        int lsr;
+
+        if (info->type == PORT_UNKNOWN)
+                return;
+
+        if (info->xmit_fifo_size == 0)
+                return;         /* Just in case.... */
+
+        orig_jiffies = jiffies;
+        /*
+         * Set the check interval to be 1/5 of the estimated time to
+         * send a single character, and make it at least 1.  The check
+         * interval should also be less than the timeout.
+         *
+         * Note: we have to use pretty tight timings here to satisfy
+         * the NIST-PCTS.
+         */
+        char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
+        char_time = char_time / 5;
+        if (char_time == 0)
+                char_time = 1;
+        if (timeout && timeout < char_time)
+                char_time = timeout;
+        /*
+         * If the transmitter hasn't cleared in twice the approximate
+         * amount of time to send the entire FIFO, it probably won't
+         * ever clear.  This assumes the UART isn't doing flow
+         * control, which is currently the case.  Hence, if it ever
+         * takes longer than info->timeout, this is probably due to a
+         * UART bug of some kind.  So, we clamp the timeout parameter at
+         * 2*info->timeout.
+         */
+        if (!timeout || timeout > 2 * info->timeout)
+                timeout = 2 * info->timeout;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+        printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
+                timeout, char_time);
+        printk("jiff=%lu...", jiffies);
+#endif
+        spin_lock_irqsave(&info->slock, flags);
+        while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+                printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
+#endif
+                spin_unlock_irqrestore(&info->slock, flags);
+                schedule_timeout_interruptible(char_time);
+                spin_lock_irqsave(&info->slock, flags);
+                if (signal_pending(current))
+                        break;
+                if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                        break;
+        }
+        spin_unlock_irqrestore(&info->slock, flags);
+        set_current_state(TASK_RUNNING);
+
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+        printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
+#endif
+}
+
+/*
+ * This routine is called by tty_hangup() when a hangup is signaled.
+ */
+static void mxser_hangup(struct tty_struct *tty)
+{
+        struct mxser_port *info = tty->driver_data;
+
+        mxser_flush_buffer(tty);
+        tty_port_hangup(&info->port);
+}
+
+/*
+ * mxser_rs_break() --- routine which turns the break handling on or off
+ */
+static int mxser_rs_break(struct tty_struct *tty, int break_state)
+{
+        struct mxser_port *info = tty->driver_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->slock, flags);
+        if (break_state == -1)
+                outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
+                        info->ioaddr + UART_LCR);
+        else
+                outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
+                        info->ioaddr + UART_LCR);
+        spin_unlock_irqrestore(&info->slock, flags);
+        return 0;
+}
+
+static void mxser_receive_chars(struct tty_struct *tty,
+                                struct mxser_port *port, int *status)
+{
+        unsigned char ch, gdl;
+        int ignored = 0;
+        int cnt = 0;
+        int recv_room;
+        int max = 256;
+
+        recv_room = tty->receive_room;
+        if (recv_room == 0 && !port->ldisc_stop_rx)
+                mxser_stoprx(tty);
+        if (port->board->chip_flag != MOXA_OTHER_UART) {
+
+                if (*status & UART_LSR_SPECIAL)
+                        goto intr_old;
+                if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
+                                (*status & MOXA_MUST_LSR_RERR))
+                        goto intr_old;
+                if (*status & MOXA_MUST_LSR_RERR)
+                        goto intr_old;
+
+                gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
+
+                if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
+                        gdl &= MOXA_MUST_GDL_MASK;
+                if (gdl >= recv_room) {
+                        if (!port->ldisc_stop_rx)
+                                mxser_stoprx(tty);
+                }
+                while (gdl--) {
+                        ch = inb(port->ioaddr + UART_RX);
+                        tty_insert_flip_char(tty, ch, 0);
+                        cnt++;
+                }
+                goto end_intr;
+        }
+intr_old:
+
+        do {
+                if (max-- < 0)
+                        break;
+
+                ch = inb(port->ioaddr + UART_RX);
+                if (port->board->chip_flag && (*status & UART_LSR_OE))
+                        outb(0x23, port->ioaddr + UART_FCR);
+                *status &= port->read_status_mask;
+                if (*status & port->ignore_status_mask) {
+                        if (++ignored > 100)
+                                break;
+                } else {
+                        char flag = 0;
+                        if (*status & UART_LSR_SPECIAL) {
+                                if (*status & UART_LSR_BI) {
+                                        flag = TTY_BREAK;
+                                        port->icount.brk++;
+
+                                        if (port->port.flags & ASYNC_SAK)
+                                                do_SAK(tty);
+                                } else if (*status & UART_LSR_PE) {
+                                        flag = TTY_PARITY;
+                                        port->icount.parity++;
+                                } else if (*status & UART_LSR_FE) {
+                                        flag = TTY_FRAME;
+                                        port->icount.frame++;
+                                } else if (*status & UART_LSR_OE) {
+                                        flag = TTY_OVERRUN;
+                                        port->icount.overrun++;
+                                } else
+                                        flag = TTY_BREAK;
+                        }
+                        tty_insert_flip_char(tty, ch, flag);
+                        cnt++;
+                        if (cnt >= recv_room) {
+                                if (!port->ldisc_stop_rx)
+                                        mxser_stoprx(tty);
+                                break;
+                        }
+
+                }
+
+                if (port->board->chip_flag)
+                        break;
+
+                *status = inb(port->ioaddr + UART_LSR);
+        } while (*status & UART_LSR_DR);
+
+end_intr:
+        mxvar_log.rxcnt[tty->index] += cnt;
+        port->mon_data.rxcnt += cnt;
+        port->mon_data.up_rxcnt += cnt;
+
+        /*
+         * We are called from an interrupt context with &port->slock
+         * being held. Drop it temporarily in order to prevent
+         * recursive locking.
+         */
+        spin_unlock(&port->slock);
+        tty_flip_buffer_push(tty);
+        spin_lock(&port->slock);
+}
+
+static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
+{
+        int count, cnt;
+
+        if (port->x_char) {
+                outb(port->x_char, port->ioaddr + UART_TX);
+                port->x_char = 0;
+                mxvar_log.txcnt[tty->index]++;
+                port->mon_data.txcnt++;
+                port->mon_data.up_txcnt++;
+                port->icount.tx++;
+                return;
+        }
+
+        if (port->port.xmit_buf == NULL)
+                return;
+
+        if (port->xmit_cnt <= 0 || tty->stopped ||
+                        (tty->hw_stopped &&
+                        (port->type != PORT_16550A) &&
+                        (!port->board->chip_flag))) {
+                port->IER &= ~UART_IER_THRI;
+                outb(port->IER, port->ioaddr + UART_IER);
+                return;
+        }
+
+        cnt = port->xmit_cnt;
+        count = port->xmit_fifo_size;
+        do {
+                outb(port->port.xmit_buf[port->xmit_tail++],
+                        port->ioaddr + UART_TX);
+                port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
+                if (--port->xmit_cnt <= 0)
+                        break;
+        } while (--count > 0);
+        mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
+
+        port->mon_data.txcnt += (cnt - port->xmit_cnt);
+        port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
+        port->icount.tx += (cnt - port->xmit_cnt);
+
+        if (port->xmit_cnt < WAKEUP_CHARS)
+                tty_wakeup(tty);
+
+        if (port->xmit_cnt <= 0) {
+                port->IER &= ~UART_IER_THRI;
+                outb(port->IER, port->ioaddr + UART_IER);
+        }
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+static irqreturn_t mxser_interrupt(int irq, void *dev_id)
+{
+        int status, iir, i;
+        struct mxser_board *brd = NULL;
+        struct mxser_port *port;
+        int max, irqbits, bits, msr;
+        unsigned int int_cnt, pass_counter = 0;
+        int handled = IRQ_NONE;
+        struct tty_struct *tty;
+
+        for (i = 0; i < MXSER_BOARDS; i++)
+                if (dev_id == &mxser_boards[i]) {
+                        brd = dev_id;
+                        break;
+                }
+
+        if (i == MXSER_BOARDS)
+                goto irq_stop;
+        if (brd == NULL)
+                goto irq_stop;
+        max = brd->info->nports;
+        while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
+                irqbits = inb(brd->vector) & brd->vector_mask;
+                if (irqbits == brd->vector_mask)
+                        break;
+
+                handled = IRQ_HANDLED;
+                for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
+                        if (irqbits == brd->vector_mask)
+                                break;
+                        if (bits & irqbits)
+                                continue;
+                        port = &brd->ports[i];
+
+                        int_cnt = 0;
+                        spin_lock(&port->slock);
+                        do {
+                                iir = inb(port->ioaddr + UART_IIR);
+                                if (iir & UART_IIR_NO_INT)
+                                        break;
+                                iir &= MOXA_MUST_IIR_MASK;
+                                tty = tty_port_tty_get(&port->port);
+                                if (!tty ||
+                                                (port->port.flags & ASYNC_CLOSING) ||
+                                                !(port->port.flags &
+                                                        ASYNC_INITIALIZED)) {
+                                        status = inb(port->ioaddr + UART_LSR);
+                                        outb(0x27, port->ioaddr + UART_FCR);
+                                        inb(port->ioaddr + UART_MSR);
+                                        tty_kref_put(tty);
+                                        break;
+                                }
+
+                                status = inb(port->ioaddr + UART_LSR);
+
+                                if (status & UART_LSR_PE)
+                                        port->err_shadow |= NPPI_NOTIFY_PARITY;
+                                if (status & UART_LSR_FE)
+                                        port->err_shadow |= NPPI_NOTIFY_FRAMING;
+                                if (status & UART_LSR_OE)
+                                        port->err_shadow |=
+                                                NPPI_NOTIFY_HW_OVERRUN;
+                                if (status & UART_LSR_BI)
+                                        port->err_shadow |= NPPI_NOTIFY_BREAK;
+
+                                if (port->board->chip_flag) {
+                                        if (iir == MOXA_MUST_IIR_GDA ||
+                                            iir == MOXA_MUST_IIR_RDA ||
+                                            iir == MOXA_MUST_IIR_RTO ||
+                                            iir == MOXA_MUST_IIR_LSR)
+                                                mxser_receive_chars(tty, port,
+                                                                &status);
+
+                                } else {
+                                        status &= port->read_status_mask;
+                                        if (status & UART_LSR_DR)
+                                                mxser_receive_chars(tty, port,
+                                                                &status);
+                                }
+                                msr = inb(port->ioaddr + UART_MSR);
+                                if (msr & UART_MSR_ANY_DELTA)
+                                        mxser_check_modem_status(tty, port, msr);
+
+                                if (port->board->chip_flag) {
+                                        if (iir == 0x02 && (status &
+                                                                UART_LSR_THRE))
+                                                mxser_transmit_chars(tty, port);
+                                } else {
+                                        if (status & UART_LSR_THRE)
+                                                mxser_transmit_chars(tty, port);
+                                }
+                                tty_kref_put(tty);
+                        } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
+                        spin_unlock(&port->slock);
+                }
+        }
+
+irq_stop:
+        return handled;
+}
+
+static const struct tty_operations mxser_ops = {
+        .open = mxser_open,
+        .close = mxser_close,
+        .write = mxser_write,
+        .put_char = mxser_put_char,
+        .flush_chars = mxser_flush_chars,
+        .write_room = mxser_write_room,
+        .chars_in_buffer = mxser_chars_in_buffer,
+        .flush_buffer = mxser_flush_buffer,
+        .ioctl = mxser_ioctl,
+        .throttle = mxser_throttle,
+        .unthrottle = mxser_unthrottle,
+        .set_termios = mxser_set_termios,
+        .stop = mxser_stop,
+        .start = mxser_start,
+        .hangup = mxser_hangup,
+        .break_ctl = mxser_rs_break,
+        .wait_until_sent = mxser_wait_until_sent,
+        .tiocmget = mxser_tiocmget,
+        .tiocmset = mxser_tiocmset,
+        .get_icount = mxser_get_icount,
+};
+
+struct tty_port_operations mxser_port_ops = {
+        .carrier_raised = mxser_carrier_raised,
+        .dtr_rts = mxser_dtr_rts,
+        .activate = mxser_activate,
+        .shutdown = mxser_shutdown_port,
+};
+
+/*
+ * The MOXA Smartio/Industio serial driver boot-time initialization code!
+ */
+
+static void mxser_release_ISA_res(struct mxser_board *brd)
+{
+        free_irq(brd->irq, brd);
+        release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
+        release_region(brd->vector, 1);
+}
+
+static int __devinit mxser_initbrd(struct mxser_board *brd,
+                struct pci_dev *pdev)
+{
+        struct mxser_port *info;
+        unsigned int i;
+        int retval;
+
+        printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
+                        brd->ports[0].max_baud);
+
+        for (i = 0; i < brd->info->nports; i++) {
+                info = &brd->ports[i];
+                tty_port_init(&info->port);
+                info->port.ops = &mxser_port_ops;
+                info->board = brd;
+                info->stop_rx = 0;
+                info->ldisc_stop_rx = 0;
+
+                /* Enhance mode enabled here */
+                if (brd->chip_flag != MOXA_OTHER_UART)
+                        mxser_enable_must_enchance_mode(info->ioaddr);
+
+                info->port.flags = ASYNC_SHARE_IRQ;
+                info->type = brd->uart_type;
+
+                process_txrx_fifo(info);
+
+                info->custom_divisor = info->baud_base * 16;
+                info->port.close_delay = 5 * HZ / 10;
+                info->port.closing_wait = 30 * HZ;
+                info->normal_termios = mxvar_sdriver->init_termios;
+                memset(&info->mon_data, 0, sizeof(struct mxser_mon));
+                info->err_shadow = 0;
+                spin_lock_init(&info->slock);
+
+                /* before set INT ISR, disable all int */
+                outb(inb(info->ioaddr + UART_IER) & 0xf0,
+                        info->ioaddr + UART_IER);
+        }
+
+        retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
+                        brd);
+        if (retval)
+                printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
+                        "conflict with another device.\n",
+                        brd->info->name, brd->irq);
+
+        return retval;
+}
+
+static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
+{
+        int id, i, bits;
+        unsigned short regs[16], irq;
+        unsigned char scratch, scratch2;
+
+        brd->chip_flag = MOXA_OTHER_UART;
+
+        id = mxser_read_register(cap, regs);
+        switch (id) {
+        case C168_ASIC_ID:
+                brd->info = &mxser_cards[0];
+                break;
+        case C104_ASIC_ID:
+                brd->info = &mxser_cards[1];
+                break;
+        case CI104J_ASIC_ID:
+                brd->info = &mxser_cards[2];
+                break;
+        case C102_ASIC_ID:
+                brd->info = &mxser_cards[5];
+                break;
+        case CI132_ASIC_ID:
+                brd->info = &mxser_cards[6];
+                break;
+        case CI134_ASIC_ID:
+                brd->info = &mxser_cards[7];
+                break;
+        default:
+                return 0;
+        }
+
+        irq = 0;
+        /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
+           Flag-hack checks if configuration should be read as 2-port here. */
+        if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
+                irq = regs[9] & 0xF000;
+                irq = irq | (irq >> 4);
+                if (irq != (regs[9] & 0xFF00))
+                        goto err_irqconflict;
+        } else if (brd->info->nports == 4) {
+                irq = regs[9] & 0xF000;
+                irq = irq | (irq >> 4);
+                irq = irq | (irq >> 8);
+                if (irq != regs[9])
+                        goto err_irqconflict;
+        } else if (brd->info->nports == 8) {
+                irq = regs[9] & 0xF000;
+                irq = irq | (irq >> 4);
+                irq = irq | (irq >> 8);
+                if ((irq != regs[9]) || (irq != regs[10]))
+                        goto err_irqconflict;
+        }
+
+        if (!irq) {
+                printk(KERN_ERR "mxser: interrupt number unset\n");
+                return -EIO;
+        }
+        brd->irq = ((int)(irq & 0xF000) >> 12);
+        for (i = 0; i < 8; i++)
+                brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
+        if ((regs[12] & 0x80) == 0) {
+                printk(KERN_ERR "mxser: invalid interrupt vector\n");
+                return -EIO;
+        }
+        brd->vector = (int)regs[11];    /* interrupt vector */
+        if (id == 1)
+                brd->vector_mask = 0x00FF;
+        else
+                brd->vector_mask = 0x000F;
+        for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
+                if (regs[12] & bits) {
+                        brd->ports[i].baud_base = 921600;
+                        brd->ports[i].max_baud = 921600;
+                } else {
+                        brd->ports[i].baud_base = 115200;
+                        brd->ports[i].max_baud = 115200;
+                }
+        }
+        scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
+        outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
+        outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
+        outb(scratch2, cap + UART_LCR);
+        outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
+        scratch = inb(cap + UART_IIR);
+
+        if (scratch & 0xC0)
+                brd->uart_type = PORT_16550A;
+        else
+                brd->uart_type = PORT_16450;
+        if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
+                        "mxser(IO)")) {
+                printk(KERN_ERR "mxser: can't request ports I/O region: "
+                                "0x%.8lx-0x%.8lx\n",
+                                brd->ports[0].ioaddr, brd->ports[0].ioaddr +
+                                8 * brd->info->nports - 1);
+                return -EIO;
+        }
+        if (!request_region(brd->vector, 1, "mxser(vector)")) {
+                release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
+                printk(KERN_ERR "mxser: can't request interrupt vector region: "
+                                "0x%.8lx-0x%.8lx\n",
+                                brd->ports[0].ioaddr, brd->ports[0].ioaddr +
+                                8 * brd->info->nports - 1);
+                return -EIO;
+        }
+        return brd->info->nports;
+
+err_irqconflict:
+        printk(KERN_ERR "mxser: invalid interrupt number\n");
+        return -EIO;
+}
+
+static int __devinit mxser_probe(struct pci_dev *pdev,
+                const struct pci_device_id *ent)
+{
+#ifdef CONFIG_PCI
+        struct mxser_board *brd;
+        unsigned int i, j;
+        unsigned long ioaddress;
+        int retval = -EINVAL;
+
+        for (i = 0; i < MXSER_BOARDS; i++)
+                if (mxser_boards[i].info == NULL)
+                        break;
+
+        if (i >= MXSER_BOARDS) {
+                dev_err(&pdev->dev, "too many boards found (maximum %d), board "
+                                "not configured\n", MXSER_BOARDS);
+                goto err;
+        }
+
+        brd = &mxser_boards[i];
+        brd->idx = i * MXSER_PORTS_PER_BOARD;
+        dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
+                mxser_cards[ent->driver_data].name,
+                pdev->bus->number, PCI_SLOT(pdev->devfn));
+
+        retval = pci_enable_device(pdev);
+        if (retval) {
+                dev_err(&pdev->dev, "PCI enable failed\n");
+                goto err;
+        }
+
+        /* io address */
+        ioaddress = pci_resource_start(pdev, 2);
+        retval = pci_request_region(pdev, 2, "mxser(IO)");
+        if (retval)
+                goto err_dis;
+
+        brd->info = &mxser_cards[ent->driver_data];
+        for (i = 0; i < brd->info->nports; i++)
+                brd->ports[i].ioaddr = ioaddress + 8 * i;
+
+        /* vector */
+        ioaddress = pci_resource_start(pdev, 3);
+        retval = pci_request_region(pdev, 3, "mxser(vector)");
+        if (retval)
+                goto err_zero;
+        brd->vector = ioaddress;
+
+        /* irq */
+        brd->irq = pdev->irq;
+
+        brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
+        brd->uart_type = PORT_16550A;
+        brd->vector_mask = 0;
+
+        for (i = 0; i < brd->info->nports; i++) {
+                for (j = 0; j < UART_INFO_NUM; j++) {
+                        if (Gpci_uart_info[j].type == brd->chip_flag) {
+                                brd->ports[i].max_baud =
+                                        Gpci_uart_info[j].max_baud;
+
+                                /* exception....CP-102 */
+                                if (brd->info->flags & MXSER_HIGHBAUD)
+                                        brd->ports[i].max_baud = 921600;
+                                break;
+                        }
+                }
+        }
+
+        if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
+                for (i = 0; i < brd->info->nports; i++) {
+                        if (i < 4)
+                                brd->ports[i].opmode_ioaddr = ioaddress + 4;
+                        else
+                                brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
+                }
+                outb(0, ioaddress + 4); /* default set to RS232 mode */
+                outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
+        }
+
+        for (i = 0; i < brd->info->nports; i++) {
+                brd->vector_mask |= (1 << i);
+                brd->ports[i].baud_base = 921600;
+        }
+
+        /* mxser_initbrd will hook ISR. */
+        retval = mxser_initbrd(brd, pdev);
+        if (retval)
+                goto err_rel3;
+
+        for (i = 0; i < brd->info->nports; i++)
+                tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);
+
+        pci_set_drvdata(pdev, brd);
+
+        return 0;
+err_rel3:
+        pci_release_region(pdev, 3);
+err_zero:
+        brd->info = NULL;
+        pci_release_region(pdev, 2);
+err_dis:
+        pci_disable_device(pdev);
+err:
+        return retval;
+#else
+        return -ENODEV;
+#endif
+}
+
+static void __devexit mxser_remove(struct pci_dev *pdev)
+{
+#ifdef CONFIG_PCI
+        struct mxser_board *brd = pci_get_drvdata(pdev);
+        unsigned int i;
+
+        for (i = 0; i < brd->info->nports; i++)
+                tty_unregister_device(mxvar_sdriver, brd->idx + i);
+
+        free_irq(pdev->irq, brd);
+        pci_release_region(pdev, 2);
+        pci_release_region(pdev, 3);
+        pci_disable_device(pdev);
+        brd->info = NULL;
+#endif
+}
+
+static struct pci_driver mxser_driver = {
+        .name = "mxser",
+        .id_table = mxser_pcibrds,
+        .probe = mxser_probe,
+        .remove = __devexit_p(mxser_remove)
+};
+
+static int __init mxser_module_init(void)
+{
+        struct mxser_board *brd;
+        unsigned int b, i, m;
+        int retval;
+
+        mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
+        if (!mxvar_sdriver)
+                return -ENOMEM;
+
+        printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
+                MXSER_VERSION);
+
+        /* Initialize the tty_driver structure */
+        mxvar_sdriver->owner = THIS_MODULE;
+        mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
+        mxvar_sdriver->name = "ttyMI";
+        mxvar_sdriver->major = ttymajor;
+        mxvar_sdriver->minor_start = 0;
+        mxvar_sdriver->num = MXSER_PORTS + 1;
+        mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
+        mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
+        mxvar_sdriver->init_termios = tty_std_termios;
+        mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
+        mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
+        tty_set_operations(mxvar_sdriver, &mxser_ops);
+
+        retval = tty_register_driver(mxvar_sdriver);
+        if (retval) {
+                printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
+                                "tty driver !\n");
+                goto err_put;
+        }
+
+        /* Start finding ISA boards here */
+        for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
+                if (!ioaddr[b])
+                        continue;
+
+                brd = &mxser_boards[m];
+                retval = mxser_get_ISA_conf(ioaddr[b], brd);
+                if (retval <= 0) {
+                        brd->info = NULL;
+                        continue;
+                }
+
+                printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
+                                brd->info->name, ioaddr[b]);
+
+                /* mxser_initbrd will hook ISR. */
+                if (mxser_initbrd(brd, NULL) < 0) {
+                        brd->info = NULL;
+                        continue;
+                }
+
+                brd->idx = m * MXSER_PORTS_PER_BOARD;
+                for (i = 0; i < brd->info->nports; i++)
+                        tty_register_device(mxvar_sdriver, brd->idx + i, NULL);
+
+                m++;
+        }
+
+        retval = pci_register_driver(&mxser_driver);
+        if (retval) {
+                printk(KERN_ERR "mxser: can't register pci driver\n");
+                if (!m) {
+                        retval = -ENODEV;
+                        goto err_unr;
+                } /* else: we have some ISA cards under control */
+        }
+
+        return 0;
+err_unr:
+        tty_unregister_driver(mxvar_sdriver);
+err_put:
+        put_tty_driver(mxvar_sdriver);
+        return retval;
+}
+
+static void __exit mxser_module_exit(void)
+{
+        unsigned int i, j;
+
+        pci_unregister_driver(&mxser_driver);
+
+        for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
+                if (mxser_boards[i].info != NULL)
+                        for (j = 0; j < mxser_boards[i].info->nports; j++)
+                                tty_unregister_device(mxvar_sdriver,
+                                                mxser_boards[i].idx + j);
+        tty_unregister_driver(mxvar_sdriver);
+        put_tty_driver(mxvar_sdriver);
+
+        for (i = 0; i < MXSER_BOARDS; i++)
+                if (mxser_boards[i].info != NULL)
+                        mxser_release_ISA_res(&mxser_boards[i]);
+}
+
+module_init(mxser_module_init);
+module_exit(mxser_module_exit);
diff --git a/drivers/tty/mxser.h b/drivers/tty/mxser.h
new file mode 100644
index 000000000000..0bf794313ffd
--- /dev/null
+++ b/drivers/tty/mxser.h
@@ -0,0 +1,150 @@
+#ifndef _MXSER_H
+#define _MXSER_H
+
+/*
+ *      Semi-public control interfaces
+ */
+
+/*
+ *      MOXA ioctls
+ */
+
+#define MOXA                    0x400
+#define MOXA_GETDATACOUNT       (MOXA + 23)
+#define MOXA_DIAGNOSE           (MOXA + 50)
+#define MOXA_CHKPORTENABLE      (MOXA + 60)
+#define MOXA_HighSpeedOn        (MOXA + 61)
+#define MOXA_GET_MAJOR          (MOXA + 63)
+#define MOXA_GETMSTATUS         (MOXA + 65)
+#define MOXA_SET_OP_MODE        (MOXA + 66)
+#define MOXA_GET_OP_MODE        (MOXA + 67)
+
+#define RS232_MODE              0
+#define RS485_2WIRE_MODE        1
+#define RS422_MODE              2
+#define RS485_4WIRE_MODE        3
+#define OP_MODE_MASK            3
+
+#define MOXA_SDS_RSTICOUNTER    (MOXA + 69)
+#define MOXA_ASPP_OQUEUE        (MOXA + 70)
+#define MOXA_ASPP_MON           (MOXA + 73)
+#define MOXA_ASPP_LSTATUS       (MOXA + 74)
+#define MOXA_ASPP_MON_EXT       (MOXA + 75)
+#define MOXA_SET_BAUD_METHOD    (MOXA + 76)
+
+/* --------------------------------------------------- */
+
+#define NPPI_NOTIFY_PARITY      0x01
+#define NPPI_NOTIFY_FRAMING     0x02
+#define NPPI_NOTIFY_HW_OVERRUN  0x04
+#define NPPI_NOTIFY_SW_OVERRUN  0x08
+#define NPPI_NOTIFY_BREAK       0x10
+
+#define NPPI_NOTIFY_CTSHOLD         0x01        /* Tx hold by CTS low */
+#define NPPI_NOTIFY_DSRHOLD         0x02        /* Tx hold by DSR low */
+#define NPPI_NOTIFY_XOFFHOLD        0x08        /* Tx hold by Xoff received */
+#define NPPI_NOTIFY_XOFFXENT        0x10        /* Xoff Sent */
+
+/* follow just for Moxa Must chip define. */
+/* */
+/* when LCR register (offset 0x03) write following value, */
+/* the Must chip will enter enchance mode. And write value */
+/* on EFR (offset 0x02) bit 6,7 to change bank. */
+#define MOXA_MUST_ENTER_ENCHANCE        0xBF
+
+/* when enhance mode enable, access on general bank register */
+#define MOXA_MUST_GDL_REGISTER          0x07
+#define MOXA_MUST_GDL_MASK              0x7F
+#define MOXA_MUST_GDL_HAS_BAD_DATA      0x80
+
+#define MOXA_MUST_LSR_RERR              0x80    /* error in receive FIFO */
+/* enchance register bank select and enchance mode setting register */
+/* when LCR register equal to 0xBF */
+#define MOXA_MUST_EFR_REGISTER          0x02
+/* enchance mode enable */
+#define MOXA_MUST_EFR_EFRB_ENABLE       0x10
+/* enchance reister bank set 0, 1, 2 */
+#define MOXA_MUST_EFR_BANK0             0x00
+#define MOXA_MUST_EFR_BANK1             0x40
+#define MOXA_MUST_EFR_BANK2             0x80
+#define MOXA_MUST_EFR_BANK3             0xC0
+#define MOXA_MUST_EFR_BANK_MASK         0xC0
+
+/* set XON1 value register, when LCR=0xBF and change to bank0 */
+#define MOXA_MUST_XON1_REGISTER         0x04
+
+/* set XON2 value register, when LCR=0xBF and change to bank0 */
+#define MOXA_MUST_XON2_REGISTER         0x05
+
+/* set XOFF1 value register, when LCR=0xBF and change to bank0 */
+#define MOXA_MUST_XOFF1_REGISTER        0x06
+
+/* set XOFF2 value register, when LCR=0xBF and change to bank0 */
+#define MOXA_MUST_XOFF2_REGISTER        0x07
+
+#define MOXA_MUST_RBRTL_REGISTER        0x04
+#define MOXA_MUST_RBRTH_REGISTER        0x05
+#define MOXA_MUST_RBRTI_REGISTER        0x06
+#define MOXA_MUST_THRTL_REGISTER        0x07
+#define MOXA_MUST_ENUM_REGISTER         0x04
+#define MOXA_MUST_HWID_REGISTER         0x05
+#define MOXA_MUST_ECR_REGISTER          0x06
+#define MOXA_MUST_CSR_REGISTER          0x07
+
+/* good data mode enable */
+#define MOXA_MUST_FCR_GDA_MODE_ENABLE   0x20
+/* only good data put into RxFIFO */
+#define MOXA_MUST_FCR_GDA_ONLY_ENABLE   0x10
+
+/* enable CTS interrupt */
+#define MOXA_MUST_IER_ECTSI             0x80
+/* enable RTS interrupt */
+#define MOXA_MUST_IER_ERTSI             0x40
+/* enable Xon/Xoff interrupt */
+#define MOXA_MUST_IER_XINT              0x20
+/* enable GDA interrupt */
+#define MOXA_MUST_IER_EGDAI             0x10
+
+#define MOXA_MUST_RECV_ISR              (UART_IER_RDI | MOXA_MUST_IER_EGDAI)
+
+/* GDA interrupt pending */
+#define MOXA_MUST_IIR_GDA               0x1C
+#define MOXA_MUST_IIR_RDA               0x04
+#define MOXA_MUST_IIR_RTO               0x0C
+#define MOXA_MUST_IIR_LSR               0x06
+
+/* received Xon/Xoff or specical interrupt pending */
+#define MOXA_MUST_IIR_XSC               0x10
+
+/* RTS/CTS change state interrupt pending */
+#define MOXA_MUST_IIR_RTSCTS            0x20
+#define MOXA_MUST_IIR_MASK              0x3E
+
+#define MOXA_MUST_MCR_XON_FLAG          0x40
+#define MOXA_MUST_MCR_XON_ANY           0x80
+#define MOXA_MUST_MCR_TX_XON            0x08
+
+/* software flow control on chip mask value */
+#define MOXA_MUST_EFR_SF_MASK           0x0F
+/* send Xon1/Xoff1 */
+#define MOXA_MUST_EFR_SF_TX1            0x08
+/* send Xon2/Xoff2 */
+#define MOXA_MUST_EFR_SF_TX2            0x04
+/* send Xon1,Xon2/Xoff1,Xoff2 */
+#define MOXA_MUST_EFR_SF_TX12           0x0C
+/* don't send Xon/Xoff */
+#define MOXA_MUST_EFR_SF_TX_NO          0x00
+/* Tx software flow control mask */
+#define MOXA_MUST_EFR_SF_TX_MASK        0x0C
+/* don't receive Xon/Xoff */
+#define MOXA_MUST_EFR_SF_RX_NO          0x00
+/* receive Xon1/Xoff1 */
+#define MOXA_MUST_EFR_SF_RX1            0x02
+/* receive Xon2/Xoff2 */
+#define MOXA_MUST_EFR_SF_RX2            0x01
+/* receive Xon1,Xon2/Xoff1,Xoff2 */
+#define MOXA_MUST_EFR_SF_RX12           0x03
+/* Rx software flow control mask */
+#define MOXA_MUST_EFR_SF_RX_MASK        0x03
+
+#endif
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
new file mode 100644
index 000000000000..19b4ae052af8
--- /dev/null
+++ b/drivers/tty/n_gsm.c
@@ -0,0 +1,2810 @@
+/*
+ * n_gsm.c GSM 0710 tty multiplexor
+ * Copyright (c) 2009/10 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *      * THIS IS A DEVELOPMENT SNAPSHOT IT IS NOT A FINAL RELEASE *
+ *
+ * TO DO:
+ *      Mostly done:    ioctls for setting modes/timing
+ *      Partly done:    hooks so you can pull off frames to non tty devs
+ *      Restart DLCI 0 when it closes ?
+ *      Test basic encoding
+ *      Improve the tx engine
+ *      Resolve tx side locking by adding a queue_head and routing
+ *              all control traffic via it
+ *      General tidy/document
+ *      Review the locking/move to refcounts more (mux now moved to an
+ *              alloc/free model ready)
+ *      Use newest tty open/close port helpers and install hooks
+ *      What to do about power functions ?
+ *      Termios setting and negotiation
+ *      Do we need a 'which mux are you' ioctl to correlate mux and tty sets
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/fcntl.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/ctype.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/bitops.h>
+#include <linux/file.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/tty_flip.h>
+#include <linux/tty_driver.h>
+#include <linux/serial.h>
+#include <linux/kfifo.h>
+#include <linux/skbuff.h>
+#include <linux/gsmmux.h>
+
+static int debug;
+module_param(debug, int, 0600);
+
+#define T1      (HZ/10)
+#define T2      (HZ/3)
+#define N2      3
+
+/* Use long timers for testing at low speed with debug on */
+#ifdef DEBUG_TIMING
+#define T1      HZ
+#define T2      (2 * HZ)
+#endif
+
+/*
+ * Semi-arbitrary buffer size limits. 0710 is normally run with 32-64 byte
+ * limits so this is plenty
+ */
+#define MAX_MRU 512
+#define MAX_MTU 512
+
+/*
+ *      Each block of data we have queued to go out is in the form of
+ *      a gsm_msg which holds everything we need in a link layer independent
+ *      format
+ */
+
+struct gsm_msg {
+        struct gsm_msg *next;
+        u8 addr;                /* DLCI address + flags */
+        u8 ctrl;                /* Control byte + flags */
+        unsigned int len;       /* Length of data block (can be zero) */
+        unsigned char *data;    /* Points into buffer but not at the start */
+        unsigned char buffer[0];
+};
+
+/*
+ *      Each active data link has a gsm_dlci structure associated which ties
+ *      the link layer to an optional tty (if the tty side is open). To avoid
+ *      complexity right now these are only ever freed up when the mux is
+ *      shut down.
+ *
+ *      At the moment we don't free DLCI objects until the mux is torn down
+ *      this avoid object life time issues but might be worth review later.
+ */
+
+struct gsm_dlci {
+        struct gsm_mux *gsm;
+        int addr;
+        int state;
+#define DLCI_CLOSED             0
+#define DLCI_OPENING            1       /* Sending SABM not seen UA */
+#define DLCI_OPEN               2       /* SABM/UA complete */
+#define DLCI_CLOSING            3       /* Sending DISC not seen UA/DM */
+
+        /* Link layer */
+        spinlock_t lock;        /* Protects the internal state */
+        struct timer_list t1;   /* Retransmit timer for SABM and UA */
+        int retries;
+        /* Uplink tty if active */
+        struct tty_port port;   /* The tty bound to this DLCI if there is one */
+        struct kfifo *fifo;     /* Queue fifo for the DLCI */
+        struct kfifo _fifo;     /* For new fifo API porting only */
+        int adaption;           /* Adaption layer in use */
+        u32 modem_rx;           /* Our incoming virtual modem lines */
+        u32 modem_tx;           /* Our outgoing modem lines */
+        int dead;               /* Refuse re-open */
+        /* Flow control */
+        int throttled;          /* Private copy of throttle state */
+        int constipated;        /* Throttle status for outgoing */
+        /* Packetised I/O */
+        struct sk_buff *skb;    /* Frame being sent */
+        struct sk_buff_head skb_list;   /* Queued frames */
+        /* Data handling callback */
+        void (*data)(struct gsm_dlci *dlci, u8 *data, int len);
+};
+
+/* DLCI 0, 62/63 are special or reseved see gsmtty_open */
+
+#define NUM_DLCI                64
+
+/*
+ *      DLCI 0 is used to pass control blocks out of band of the data
+ *      flow (and with a higher link priority). One command can be outstanding
+ *      at a time and we use this structure to manage them. They are created
+ *      and destroyed by the user context, and updated by the receive paths
+ *      and timers
+ */
+
+struct gsm_control {
+        u8 cmd;         /* Command we are issuing */
+        u8 *data;       /* Data for the command in case we retransmit */
+        int len;        /* Length of block for retransmission */
+        int done;       /* Done flag */
+        int error;      /* Error if any */
+};
+
+/*
+ *      Each GSM mux we have is represented by this structure. If we are
+ *      operating as an ldisc then we use this structure as our ldisc
+ *      state. We need to sort out lifetimes and locking with respect
+ *      to the gsm mux array. For now we don't free DLCI objects that
+ *      have been instantiated until the mux itself is terminated.
+ *
+ *      To consider further: tty open versus mux shutdown.
+ */
+
+struct gsm_mux {
+        struct tty_struct *tty;         /* The tty our ldisc is bound to */
+        spinlock_t lock;
+
+        /* Events on the GSM channel */
+        wait_queue_head_t event;
+
+        /* Bits for GSM mode decoding */
+
+        /* Framing Layer */
+        unsigned char *buf;
+        int state;
+#define GSM_SEARCH              0
+#define GSM_START               1
+#define GSM_ADDRESS             2
+#define GSM_CONTROL             3
+#define GSM_LEN                 4
+#define GSM_DATA                5
+#define GSM_FCS                 6
+#define GSM_OVERRUN             7
+#define GSM_LEN0                8
+#define GSM_LEN1                9
+#define GSM_SSOF                10
+        unsigned int len;
+        unsigned int address;
+        unsigned int count;
+        int escape;
+        int encoding;
+        u8 control;
+        u8 fcs;
+        u8 received_fcs;
+        u8 *txframe;                    /* TX framing buffer */
+
+        /* Methods for the receiver side */
+        void (*receive)(struct gsm_mux *gsm, u8 ch);
+        void (*error)(struct gsm_mux *gsm, u8 ch, u8 flag);
+        /* And transmit side */
+        int (*output)(struct gsm_mux *mux, u8 *data, int len);
+
+        /* Link Layer */
+        unsigned int mru;
+        unsigned int mtu;
+        int initiator;                  /* Did we initiate connection */
+        int dead;                       /* Has the mux been shut down */
+        struct gsm_dlci *dlci[NUM_DLCI];
+        int constipated;                /* Asked by remote to shut up */
+
+        spinlock_t tx_lock;
+        unsigned int tx_bytes;          /* TX data outstanding */
+#define TX_THRESH_HI            8192
+#define TX_THRESH_LO            2048
+        struct gsm_msg *tx_head;        /* Pending data packets */
+        struct gsm_msg *tx_tail;
+
+        /* Control messages */
+        struct timer_list t2_timer;     /* Retransmit timer for commands */
+        int cretries;                   /* Command retry counter */
+        struct gsm_control *pending_cmd;/* Our current pending command */
+        spinlock_t control_lock;        /* Protects the pending command */
+
+        /* Configuration */
+        int adaption;           /* 1 or 2 supported */
+        u8 ftype;               /* UI or UIH */
+        int t1, t2;             /* Timers in 1/100th of a sec */
+        int n2;                 /* Retry count */
+
+        /* Statistics (not currently exposed) */
+        unsigned long bad_fcs;
+        unsigned long malformed;
+        unsigned long io_error;
+        unsigned long bad_size;
+        unsigned long unsupported;
+};
+
+
+/*
+ *      Mux objects - needed so that we can translate a tty index into the
+ *      relevant mux and DLCI.
+ */
+
+#define MAX_MUX         4                       /* 256 minors */
+static struct gsm_mux *gsm_mux[MAX_MUX];        /* GSM muxes */
+static spinlock_t gsm_mux_lock;
+
+/*
+ *      This section of the driver logic implements the GSM encodings
+ *      both the basic and the 'advanced'. Reliable transport is not
+ *      supported.
+ */
+
+#define CR                      0x02
+#define EA                      0x01
+#define PF                      0x10
+
+/* I is special: the rest are ..*/
+#define RR                      0x01
+#define UI                      0x03
+#define RNR                     0x05
+#define REJ                     0x09
+#define DM                      0x0F
+#define SABM                    0x2F
+#define DISC                    0x43
+#define UA                      0x63
+#define UIH                     0xEF
+
+/* Channel commands */
+#define CMD_NSC                 0x09
+#define CMD_TEST                0x11
+#define CMD_PSC                 0x21
+#define CMD_RLS                 0x29
+#define CMD_FCOFF               0x31
+#define CMD_PN                  0x41
+#define CMD_RPN                 0x49
+#define CMD_FCON                0x51
+#define CMD_CLD                 0x61
+#define CMD_SNC                 0x69
+#define CMD_MSC                 0x71
+
+/* Virtual modem bits */
+#define MDM_FC                  0x01
+#define MDM_RTC                 0x02
+#define MDM_RTR                 0x04
+#define MDM_IC                  0x20
+#define MDM_DV                  0x40
+
+#define GSM0_SOF                0xF9
+#define GSM1_SOF                0x7E
+#define GSM1_ESCAPE             0x7D
+#define GSM1_ESCAPE_BITS        0x20
+#define XON                     0x11
+#define XOFF                    0x13
+
+static const struct tty_port_operations gsm_port_ops;
+
+/*
+ *      CRC table for GSM 0710
+ */
+
+static const u8 gsm_fcs8[256] = {
+        0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75,
+        0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
+        0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69,
+        0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
+        0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D,
+        0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
+        0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51,
+        0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
+        0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05,
+        0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
+        0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19,
+        0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
+        0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D,
+        0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
+        0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21,
+        0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
+        0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95,
+        0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
+        0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89,
+        0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
+        0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD,
+        0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
+        0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1,
+        0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
+        0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5,
+        0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
+        0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9,
+        0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
+        0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD,
+        0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
+        0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1,
+        0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
+};
+
+#define INIT_FCS        0xFF
+#define GOOD_FCS        0xCF
+
+/**
+ *      gsm_fcs_add     -       update FCS
+ *      @fcs: Current FCS
+ *      @c: Next data
+ *
+ *      Update the FCS to include c. Uses the algorithm in the specification
+ *      notes.
+ */
+
+static inline u8 gsm_fcs_add(u8 fcs, u8 c)
+{
+        return gsm_fcs8[fcs ^ c];
+}
+
+/**
+ *      gsm_fcs_add_block       -       update FCS for a block
+ *      @fcs: Current FCS
+ *      @c: buffer of data
+ *      @len: length of buffer
+ *
+ *      Update the FCS to include c. Uses the algorithm in the specification
+ *      notes.
+ */
+
+static inline u8 gsm_fcs_add_block(u8 fcs, u8 *c, int len)
+{
+        while (len--)
+                fcs = gsm_fcs8[fcs ^ *c++];
+        return fcs;
+}
+
+/**
+ *      gsm_read_ea             -       read a byte into an EA
+ *      @val: variable holding value
+ *      c: byte going into the EA
+ *
+ *      Processes one byte of an EA. Updates the passed variable
+ *      and returns 1 if the EA is now completely read
+ */
+
+static int gsm_read_ea(unsigned int *val, u8 c)
+{
+        /* Add the next 7 bits into the value */
+        *val <<= 7;
+        *val |= c >> 1;
+        /* Was this the last byte of the EA 1 = yes*/
+        return c & EA;
+}
+
+/**
+ *      gsm_encode_modem        -       encode modem data bits
+ *      @dlci: DLCI to encode from
+ *
+ *      Returns the correct GSM encoded modem status bits (6 bit field) for
+ *      the current status of the DLCI and attached tty object
+ */
+
+static u8 gsm_encode_modem(const struct gsm_dlci *dlci)
+{
+        u8 modembits = 0;
+        /* FC is true flow control not modem bits */
+        if (dlci->throttled)
+                modembits |= MDM_FC;
+        if (dlci->modem_tx & TIOCM_DTR)
+                modembits |= MDM_RTC;
+        if (dlci->modem_tx & TIOCM_RTS)
+                modembits |= MDM_RTR;
+        if (dlci->modem_tx & TIOCM_RI)
+                modembits |= MDM_IC;
+        if (dlci->modem_tx & TIOCM_CD)
+                modembits |= MDM_DV;
+        return modembits;
+}
+
+/**
+ *      gsm_print_packet        -       display a frame for debug
+ *      @hdr: header to print before decode
+ *      @addr: address EA from the frame
+ *      @cr: C/R bit from the frame
+ *      @control: control including PF bit
+ *      @data: following data bytes
+ *      @dlen: length of data
+ *
+ *      Displays a packet in human readable format for debugging purposes. The
+ *      style is based on amateur radio LAP-B dump display.
+ */
+
+static void gsm_print_packet(const char *hdr, int addr, int cr,
+                                        u8 control, const u8 *data, int dlen)
+{
+        if (!(debug & 1))
+                return;
+
+        pr_info("%s %d) %c: ", hdr, addr, "RC"[cr]);
+
+        switch (control & ~PF) {
+        case SABM:
+                pr_cont("SABM");
+                break;
+        case UA:
+                pr_cont("UA");
+                break;
+        case DISC:
+                pr_cont("DISC");
+                break;
+        case DM:
+                pr_cont("DM");
+                break;
+        case UI:
+                pr_cont("UI");
+                break;
+        case UIH:
+                pr_cont("UIH");
+                break;
+        default:
+                if (!(control & 0x01)) {
+                        pr_cont("I N(S)%d N(R)%d",
+                                (control & 0x0E) >> 1, (control & 0xE) >> 5);
+                } else switch (control & 0x0F) {
+                        case RR:
+                                pr_cont("RR(%d)", (control & 0xE0) >> 5);
+                                break;
+                        case RNR:
+                                pr_cont("RNR(%d)", (control & 0xE0) >> 5);
+                                break;
+                        case REJ:
+                                pr_cont("REJ(%d)", (control & 0xE0) >> 5);
+                                break;
+                        default:
+                                pr_cont("[%02X]", control);
+                }
+        }
+
+        if (control & PF)
+                pr_cont("(P)");
+        else
+                pr_cont("(F)");
+
+        if (dlen) {
+                int ct = 0;
+                while (dlen--) {
+                        if (ct % 8 == 0) {
+                                pr_cont("\n");
+                                pr_debug("    ");
+                        }
+                        pr_cont("%02X ", *data++);
+                        ct++;
+                }
+        }
+        pr_cont("\n");
+}
+
+
+/*
+ *      Link level transmission side
+ */
+
+/**
+ *      gsm_stuff_packet        -       bytestuff a packet
+ *      @ibuf: input
+ *      @obuf: output
+ *      @len: length of input
+ *
+ *      Expand a buffer by bytestuffing it. The worst case size change
+ *      is doubling and the caller is responsible for handing out
+ *      suitable sized buffers.
+ */
+
+static int gsm_stuff_frame(const u8 *input, u8 *output, int len)
+{
+        int olen = 0;
+        while (len--) {
+                if (*input == GSM1_SOF || *input == GSM1_ESCAPE
+                    || *input == XON || *input == XOFF) {
+                        *output++ = GSM1_ESCAPE;
+                        *output++ = *input++ ^ GSM1_ESCAPE_BITS;
+                        olen++;
+                } else
+                        *output++ = *input++;
+                olen++;
+        }
+        return olen;
+}
+
+/**
+ *      gsm_send        -       send a control frame
+ *      @gsm: our GSM mux
+ *      @addr: address for control frame
+ *      @cr: command/response bit
+ *      @control:  control byte including PF bit
+ *
+ *      Format up and transmit a control frame. These do not go via the
+ *      queueing logic as they should be transmitted ahead of data when
+ *      they are needed.
+ *
+ *      FIXME: Lock versus data TX path
+ */
+
+static void gsm_send(struct gsm_mux *gsm, int addr, int cr, int control)
+{
+        int len;
+        u8 cbuf[10];
+        u8 ibuf[3];
+
+        switch (gsm->encoding) {
+        case 0:
+                cbuf[0] = GSM0_SOF;
+                cbuf[1] = (addr << 2) | (cr << 1) | EA;
+                cbuf[2] = control;
+                cbuf[3] = EA;   /* Length of data = 0 */
+                cbuf[4] = 0xFF - gsm_fcs_add_block(INIT_FCS, cbuf + 1, 3);
+                cbuf[5] = GSM0_SOF;
+                len = 6;
+                break;
+        case 1:
+        case 2:
+                /* Control frame + packing (but not frame stuffing) in mode 1 */
+                ibuf[0] = (addr << 2) | (cr << 1) | EA;
+                ibuf[1] = control;
+                ibuf[2] = 0xFF - gsm_fcs_add_block(INIT_FCS, ibuf, 2);
+                /* Stuffing may double the size worst case */
+                len = gsm_stuff_frame(ibuf, cbuf + 1, 3);
+                /* Now add the SOF markers */
+                cbuf[0] = GSM1_SOF;
+                cbuf[len + 1] = GSM1_SOF;
+                /* FIXME: we can omit the lead one in many cases */
+                len += 2;
+                break;
+        default:
+                WARN_ON(1);
+                return;
+        }
+        gsm->output(gsm, cbuf, len);
+        gsm_print_packet("-->", addr, cr, control, NULL, 0);
+}
+
+/**
+ *      gsm_response    -       send a control response
+ *      @gsm: our GSM mux
+ *      @addr: address for control frame
+ *      @control:  control byte including PF bit
+ *
+ *      Format up and transmit a link level response frame.
+ */
+
+static inline void gsm_response(struct gsm_mux *gsm, int addr, int control)
+{
+        gsm_send(gsm, addr, 0, control);
+}
+
+/**
+ *      gsm_command     -       send a control command
+ *      @gsm: our GSM mux
+ *      @addr: address for control frame
+ *      @control:  control byte including PF bit
+ *
+ *      Format up and transmit a link level command frame.
+ */
+
+static inline void gsm_command(struct gsm_mux *gsm, int addr, int control)
+{
+        gsm_send(gsm, addr, 1, control);
+}
+
+/* Data transmission */
+
+#define HDR_LEN         6       /* ADDR CTRL [LEN.2] DATA FCS */
+
+/**
+ *      gsm_data_alloc          -       allocate data frame
+ *      @gsm: GSM mux
+ *      @addr: DLCI address
+ *      @len: length excluding header and FCS
+ *      @ctrl: control byte
+ *
+ *      Allocate a new data buffer for sending frames with data. Space is left
+ *      at the front for header bytes but that is treated as an implementation
+ *      detail and not for the high level code to use
+ */
+
+static struct gsm_msg *gsm_data_alloc(struct gsm_mux *gsm, u8 addr, int len,
+                                                                u8 ctrl)
+{
+        struct gsm_msg *m = kmalloc(sizeof(struct gsm_msg) + len + HDR_LEN,
+                                                                GFP_ATOMIC);
+        if (m == NULL)
+                return NULL;
+        m->data = m->buffer + HDR_LEN - 1;      /* Allow for FCS */
+        m->len = len;
+        m->addr = addr;
+        m->ctrl = ctrl;
+        m->next = NULL;
+        return m;
+}
+
+/**
+ *      gsm_data_kick           -       poke the queue
+ *      @gsm: GSM Mux
+ *
+ *      The tty device has called us to indicate that room has appeared in
+ *      the transmit queue. Ram more data into the pipe if we have any
+ *
+ *      FIXME: lock against link layer control transmissions
+ */
+
+static void gsm_data_kick(struct gsm_mux *gsm)
+{
+        struct gsm_msg *msg = gsm->tx_head;
+        int len;
+        int skip_sof = 0;
+
+        /* FIXME: We need to apply this solely to data messages */
+        if (gsm->constipated)
+                return;
+
+        while (gsm->tx_head != NULL) {
+                msg = gsm->tx_head;
+                if (gsm->encoding != 0) {
+                        gsm->txframe[0] = GSM1_SOF;
+                        len = gsm_stuff_frame(msg->data,
+                                                gsm->txframe + 1, msg->len);
+                        gsm->txframe[len + 1] = GSM1_SOF;
+                        len += 2;
+                } else {
+                        gsm->txframe[0] = GSM0_SOF;
+                        memcpy(gsm->txframe + 1 , msg->data, msg->len);
+                        gsm->txframe[msg->len + 1] = GSM0_SOF;
+                        len = msg->len + 2;
+                }
+
+                if (debug & 4)
+                        print_hex_dump_bytes("gsm_data_kick: ",
+                                             DUMP_PREFIX_OFFSET,
+                                             gsm->txframe, len);
+
+                if (gsm->output(gsm, gsm->txframe + skip_sof,
+                                                len - skip_sof) < 0)
+                        break;
+                /* FIXME: Can eliminate one SOF in many more cases */
+                gsm->tx_head = msg->next;
+                if (gsm->tx_head == NULL)
+                        gsm->tx_tail = NULL;
+                gsm->tx_bytes -= msg->len;
+                kfree(msg);
+                /* For a burst of frames skip the extra SOF within the
+                   burst */
+                skip_sof = 1;
+        }
+}
+
+/**
+ *      __gsm_data_queue                -       queue a UI or UIH frame
+ *      @dlci: DLCI sending the data
+ *      @msg: message queued
+ *
+ *      Add data to the transmit queue and try and get stuff moving
+ *      out of the mux tty if not already doing so. The Caller must hold
+ *      the gsm tx lock.
+ */
+
+static void __gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
+{
+        struct gsm_mux *gsm = dlci->gsm;
+        u8 *dp = msg->data;
+        u8 *fcs = dp + msg->len;
+
+        /* Fill in the header */
+        if (gsm->encoding == 0) {
+                if (msg->len < 128)
+                        *--dp = (msg->len << 1) | EA;
+                else {
+                        *--dp = (msg->len >> 7);        /* bits 7 - 15 */
+                        *--dp = (msg->len & 127) << 1;  /* bits 0 - 6 */
+                }
+        }
+
+        *--dp = msg->ctrl;
+        if (gsm->initiator)
+                *--dp = (msg->addr << 2) | 2 | EA;
+        else
+                *--dp = (msg->addr << 2) | EA;
+        *fcs = gsm_fcs_add_block(INIT_FCS, dp , msg->data - dp);
+        /* Ugly protocol layering violation */
+        if (msg->ctrl == UI || msg->ctrl == (UI|PF))
+                *fcs = gsm_fcs_add_block(*fcs, msg->data, msg->len);
+        *fcs = 0xFF - *fcs;
+
+        gsm_print_packet("Q> ", msg->addr, gsm->initiator, msg->ctrl,
+                                                        msg->data, msg->len);
+
+        /* Move the header back and adjust the length, also allow for the FCS
+           now tacked on the end */
+        msg->len += (msg->data - dp) + 1;
+        msg->data = dp;
+
+        /* Add to the actual output queue */
+        if (gsm->tx_tail)
+                gsm->tx_tail->next = msg;
+        else
+                gsm->tx_head = msg;
+        gsm->tx_tail = msg;
+        gsm->tx_bytes += msg->len;
+        gsm_data_kick(gsm);
+}
+
+/**
+ *      gsm_data_queue          -       queue a UI or UIH frame
+ *      @dlci: DLCI sending the data
+ *      @msg: message queued
+ *
+ *      Add data to the transmit queue and try and get stuff moving
+ *      out of the mux tty if not already doing so. Take the
+ *      the gsm tx lock and dlci lock.
+ */
+
+static void gsm_data_queue(struct gsm_dlci *dlci, struct gsm_msg *msg)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&dlci->gsm->tx_lock, flags);
+        __gsm_data_queue(dlci, msg);
+        spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags);
+}
+
+/**
+ *      gsm_dlci_data_output    -       try and push data out of a DLCI
+ *      @gsm: mux
+ *      @dlci: the DLCI to pull data from
+ *
+ *      Pull data from a DLCI and send it into the transmit queue if there
+ *      is data. Keep to the MRU of the mux. This path handles the usual tty
+ *      interface which is a byte stream with optional modem data.
+ *
+ *      Caller must hold the tx_lock of the mux.
+ */
+
+static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)
+{
+        struct gsm_msg *msg;
+        u8 *dp;
+        int len, size;
+        int h = dlci->adaption - 1;
+
+        len = kfifo_len(dlci->fifo);
+        if (len == 0)
+                return 0;
+
+        /* MTU/MRU count only the data bits */
+        if (len > gsm->mtu)
+                len = gsm->mtu;
+
+        size = len + h;
+
+        msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype);
+        /* FIXME: need a timer or something to kick this so it can't
+           get stuck with no work outstanding and no buffer free */
+        if (msg == NULL)
+                return -ENOMEM;
+        dp = msg->data;
+        switch (dlci->adaption) {
+        case 1: /* Unstructured */
+                break;
+        case 2: /* Unstructed with modem bits. Always one byte as we never
+                   send inline break data */
+                *dp += gsm_encode_modem(dlci);
+                len--;
+                break;
+        }
+        WARN_ON(kfifo_out_locked(dlci->fifo, dp , len, &dlci->lock) != len);
+        __gsm_data_queue(dlci, msg);
+        /* Bytes of data we used up */
+        return size;
+}
+
+/**
+ *      gsm_dlci_data_output_framed  -  try and push data out of a DLCI
+ *      @gsm: mux
+ *      @dlci: the DLCI to pull data from
+ *
+ *      Pull data from a DLCI and send it into the transmit queue if there
+ *      is data. Keep to the MRU of the mux. This path handles framed data
+ *      queued as skbuffs to the DLCI.
+ *
+ *      Caller must hold the tx_lock of the mux.
+ */
+
+static int gsm_dlci_data_output_framed(struct gsm_mux *gsm,
+                                                struct gsm_dlci *dlci)
+{
+        struct gsm_msg *msg;
+        u8 *dp;
+        int len, size;
+        int last = 0, first = 0;
+        int overhead = 0;
+
+        /* One byte per frame is used for B/F flags */
+        if (dlci->adaption == 4)
+                overhead = 1;
+
+        /* dlci->skb is locked by tx_lock */
+        if (dlci->skb == NULL) {
+                dlci->skb = skb_dequeue(&dlci->skb_list);
+                if (dlci->skb == NULL)
+                        return 0;
+                first = 1;
+        }
+        len = dlci->skb->len + overhead;
+
+        /* MTU/MRU count only the data bits */
+        if (len > gsm->mtu) {
+                if (dlci->adaption == 3) {
+                        /* Over long frame, bin it */
+                        kfree_skb(dlci->skb);
+                        dlci->skb = NULL;
+                        return 0;
+                }
+                len = gsm->mtu;
+        } else
+                last = 1;
+
+        size = len + overhead;
+        msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype);
+
+        /* FIXME: need a timer or something to kick this so it can't
+           get stuck with no work outstanding and no buffer free */
+        if (msg == NULL)
+                return -ENOMEM;
+        dp = msg->data;
+
+        if (dlci->adaption == 4) { /* Interruptible framed (Packetised Data) */
+                /* Flag byte to carry the start/end info */
+                *dp++ = last << 7 | first << 6 | 1;     /* EA */
+                len--;
+        }
+        memcpy(dp, dlci->skb->data, len);
+        skb_pull(dlci->skb, len);
+        __gsm_data_queue(dlci, msg);
+        if (last)
+                dlci->skb = NULL;
+        return size;
+}
+
+/**
+ *      gsm_dlci_data_sweep             -       look for data to send
+ *      @gsm: the GSM mux
+ *
+ *      Sweep the GSM mux channels in priority order looking for ones with
+ *      data to send. We could do with optimising this scan a bit. We aim
+ *      to fill the queue totally or up to TX_THRESH_HI bytes. Once we hit
+ *      TX_THRESH_LO we get called again
+ *
+ *      FIXME: We should round robin between groups and in theory you can
+ *      renegotiate DLCI priorities with optional stuff. Needs optimising.
+ */
+
+static void gsm_dlci_data_sweep(struct gsm_mux *gsm)
+{
+        int len;
+        /* Priority ordering: We should do priority with RR of the groups */
+        int i = 1;
+
+        while (i < NUM_DLCI) {
+                struct gsm_dlci *dlci;
+
+                if (gsm->tx_bytes > TX_THRESH_HI)
+                        break;
+                dlci = gsm->dlci[i];
+                if (dlci == NULL || dlci->constipated) {
+                        i++;
+                        continue;
+                }
+                if (dlci->adaption < 3)
+                        len = gsm_dlci_data_output(gsm, dlci);
+                else
+                        len = gsm_dlci_data_output_framed(gsm, dlci);
+                if (len < 0)
+                        break;
+                /* DLCI empty - try the next */
+                if (len == 0)
+                        i++;
+        }
+}
+
+/**
+ *      gsm_dlci_data_kick      -       transmit if possible
+ *      @dlci: DLCI to kick
+ *
+ *      Transmit data from this DLCI if the queue is empty. We can't rely on
+ *      a tty wakeup except when we filled the pipe so we need to fire off
+ *      new data ourselves in other cases.
+ */
+
+static void gsm_dlci_data_kick(struct gsm_dlci *dlci)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&dlci->gsm->tx_lock, flags);
+        /* If we have nothing running then we need to fire up */
+        if (dlci->gsm->tx_bytes == 0)
+                gsm_dlci_data_output(dlci->gsm, dlci);
+        else if (dlci->gsm->tx_bytes < TX_THRESH_LO)
+                gsm_dlci_data_sweep(dlci->gsm);
+        spin_unlock_irqrestore(&dlci->gsm->tx_lock, flags);
+}
+
+/*
+ *      Control message processing
+ */
+
+
+/**
+ *      gsm_control_reply       -       send a response frame to a control
+ *      @gsm: gsm channel
+ *      @cmd: the command to use
+ *      @data: data to follow encoded info
+ *      @dlen: length of data
+ *
+ *      Encode up and queue a UI/UIH frame containing our response.
+ */
+
+static void gsm_control_reply(struct gsm_mux *gsm, int cmd, u8 *data,
+                                        int dlen)
+{
+        struct gsm_msg *msg;
+        msg = gsm_data_alloc(gsm, 0, dlen + 2, gsm->ftype);
+        if (msg == NULL)
+                return;
+        msg->data[0] = (cmd & 0xFE) << 1 | EA;  /* Clear C/R */
+        msg->data[1] = (dlen << 1) | EA;
+        memcpy(msg->data + 2, data, dlen);
+        gsm_data_queue(gsm->dlci[0], msg);
+}
+
+/**
+ *      gsm_process_modem       -       process received modem status
+ *      @tty: virtual tty bound to the DLCI
+ *      @dlci: DLCI to affect
+ *      @modem: modem bits (full EA)
+ *
+ *      Used when a modem control message or line state inline in adaption
+ *      layer 2 is processed. Sort out the local modem state and throttles
+ */
+
+static void gsm_process_modem(struct tty_struct *tty, struct gsm_dlci *dlci,
+                                                        u32 modem, int clen)
+{
+        int  mlines = 0;
+        u8 brk = 0;
+
+        /* The modem status command can either contain one octet (v.24 signals)
+           or two octets (v.24 signals + break signals). The length field will
+           either be 2 or 3 respectively. This is specified in section
+           5.4.6.3.7 of the  27.010 mux spec. */
+
+        if (clen == 2)
+                modem = modem & 0x7f;
+        else {
+                brk = modem & 0x7f;
+                modem = (modem >> 7) & 0x7f;
+        };
+
+        /* Flow control/ready to communicate */
+        if (modem & MDM_FC) {
+                /* Need to throttle our output on this device */
+                dlci->constipated = 1;
+        }
+        if (modem & MDM_RTC) {
+                mlines |= TIOCM_DSR | TIOCM_DTR;
+                dlci->constipated = 0;
+                gsm_dlci_data_kick(dlci);
+        }
+        /* Map modem bits */
+        if (modem & MDM_RTR)
+                mlines |= TIOCM_RTS | TIOCM_CTS;
+        if (modem & MDM_IC)
+                mlines |= TIOCM_RI;
+        if (modem & MDM_DV)
+                mlines |= TIOCM_CD;
+
+        /* Carrier drop -> hangup */
+        if (tty) {
+                if ((mlines & TIOCM_CD) == 0 && (dlci->modem_rx & TIOCM_CD))
+                        if (!(tty->termios->c_cflag & CLOCAL))
+                                tty_hangup(tty);
+                if (brk & 0x01)
+                        tty_insert_flip_char(tty, 0, TTY_BREAK);
+        }
+        dlci->modem_rx = mlines;
+}
+
+/**
+ *      gsm_control_modem       -       modem status received
+ *      @gsm: GSM channel
+ *      @data: data following command
+ *      @clen: command length
+ *
+ *      We have received a modem status control message. This is used by
+ *      the GSM mux protocol to pass virtual modem line status and optionally
+ *      to indicate break signals. Unpack it, convert to Linux representation
+ *      and if need be stuff a break message down the tty.
+ */
+
+static void gsm_control_modem(struct gsm_mux *gsm, u8 *data, int clen)
+{
+        unsigned int addr = 0;
+        unsigned int modem = 0;
+        struct gsm_dlci *dlci;
+        int len = clen;
+        u8 *dp = data;
+        struct tty_struct *tty;
+
+        while (gsm_read_ea(&addr, *dp++) == 0) {
+                len--;
+                if (len == 0)
+                        return;
+        }
+        /* Must be at least one byte following the EA */
+        len--;
+        if (len <= 0)
+                return;
+
+        addr >>= 1;
+        /* Closed port, or invalid ? */
+        if (addr == 0 || addr >= NUM_DLCI || gsm->dlci[addr] == NULL)
+                return;
+        dlci = gsm->dlci[addr];
+
+        while (gsm_read_ea(&modem, *dp++) == 0) {
+                len--;
+                if (len == 0)
+                        return;
+        }
+        tty = tty_port_tty_get(&dlci->port);
+        gsm_process_modem(tty, dlci, modem, clen);
+        if (tty) {
+                tty_wakeup(tty);
+                tty_kref_put(tty);
+        }
+        gsm_control_reply(gsm, CMD_MSC, data, clen);
+}
+
+/**
+ *      gsm_control_rls         -       remote line status
+ *      @gsm: GSM channel
+ *      @data: data bytes
+ *      @clen: data length
+ *
+ *      The modem sends us a two byte message on the control channel whenever
+ *      it wishes to send us an error state from the virtual link. Stuff
+ *      this into the uplink tty if present
+ */
+
+static void gsm_control_rls(struct gsm_mux *gsm, u8 *data, int clen)
+{
+        struct tty_struct *tty;
+        unsigned int addr = 0 ;
+        u8 bits;
+        int len = clen;
+        u8 *dp = data;
+
+        while (gsm_read_ea(&addr, *dp++) == 0) {
+                len--;
+                if (len == 0)
+                        return;
+        }
+        /* Must be at least one byte following ea */
+        len--;
+        if (len <= 0)
+                return;
+        addr >>= 1;
+        /* Closed port, or invalid ? */
+        if (addr == 0 || addr >= NUM_DLCI || gsm->dlci[addr] == NULL)
+                return;
+        /* No error ? */
+        bits = *dp;
+        if ((bits & 1) == 0)
+                return;
+        /* See if we have an uplink tty */
+        tty = tty_port_tty_get(&gsm->dlci[addr]->port);
+
+        if (tty) {
+                if (bits & 2)
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                if (bits & 4)
+                        tty_insert_flip_char(tty, 0, TTY_PARITY);
+                if (bits & 8)
+                        tty_insert_flip_char(tty, 0, TTY_FRAME);
+                tty_flip_buffer_push(tty);
+                tty_kref_put(tty);
+        }
+        gsm_control_reply(gsm, CMD_RLS, data, clen);
+}
+
+static void gsm_dlci_begin_close(struct gsm_dlci *dlci);
+
+/**
+ *      gsm_control_message     -       DLCI 0 control processing
+ *      @gsm: our GSM mux
+ *      @command:  the command EA
+ *      @data: data beyond the command/length EAs
+ *      @clen: length
+ *
+ *      Input processor for control messages from the other end of the link.
+ *      Processes the incoming request and queues a response frame or an
+ *      NSC response if not supported
+ */
+
+static void gsm_control_message(struct gsm_mux *gsm, unsigned int command,
+                                                        u8 *data, int clen)
+{
+        u8 buf[1];
+        switch (command) {
+        case CMD_CLD: {
+                struct gsm_dlci *dlci = gsm->dlci[0];
+                /* Modem wishes to close down */
+                if (dlci) {
+                        dlci->dead = 1;
+                        gsm->dead = 1;
+                        gsm_dlci_begin_close(dlci);
+                }
+                }
+                break;
+        case CMD_TEST:
+                /* Modem wishes to test, reply with the data */
+                gsm_control_reply(gsm, CMD_TEST, data, clen);
+                break;
+        case CMD_FCON:
+                /* Modem wants us to STFU */
+                gsm->constipated = 1;
+                gsm_control_reply(gsm, CMD_FCON, NULL, 0);
+                break;
+        case CMD_FCOFF:
+                /* Modem can accept data again */
+                gsm->constipated = 0;
+                gsm_control_reply(gsm, CMD_FCOFF, NULL, 0);
+                /* Kick the link in case it is idling */
+                gsm_data_kick(gsm);
+                break;
+        case CMD_MSC:
+                /* Out of band modem line change indicator for a DLCI */
+                gsm_control_modem(gsm, data, clen);
+                break;
+        case CMD_RLS:
+                /* Out of band error reception for a DLCI */
+                gsm_control_rls(gsm, data, clen);
+                break;
+        case CMD_PSC:
+                /* Modem wishes to enter power saving state */
+                gsm_control_reply(gsm, CMD_PSC, NULL, 0);
+                break;
+                /* Optional unsupported commands */
+        case CMD_PN:    /* Parameter negotiation */
+        case CMD_RPN:   /* Remote port negotiation */
+        case CMD_SNC:   /* Service negotiation command */
+        default:
+                /* Reply to bad commands with an NSC */
+                buf[0] = command;
+                gsm_control_reply(gsm, CMD_NSC, buf, 1);
+                break;
+        }
+}
+
+/**
+ *      gsm_control_response    -       process a response to our control
+ *      @gsm: our GSM mux
+ *      @command: the command (response) EA
+ *      @data: data beyond the command/length EA
+ *      @clen: length
+ *
+ *      Process a response to an outstanding command. We only allow a single
+ *      control message in flight so this is fairly easy. All the clean up
+ *      is done by the caller, we just update the fields, flag it as done
+ *      and return
+ */
+
+static void gsm_control_response(struct gsm_mux *gsm, unsigned int command,
+                                                        u8 *data, int clen)
+{
+        struct gsm_control *ctrl;
+        unsigned long flags;
+
+        spin_lock_irqsave(&gsm->control_lock, flags);
+
+        ctrl = gsm->pending_cmd;
+        /* Does the reply match our command */
+        command |= 1;
+        if (ctrl != NULL && (command == ctrl->cmd || command == CMD_NSC)) {
+                /* Our command was replied to, kill the retry timer */
+                del_timer(&gsm->t2_timer);
+                gsm->pending_cmd = NULL;
+                /* Rejected by the other end */
+                if (command == CMD_NSC)
+                        ctrl->error = -EOPNOTSUPP;
+                ctrl->done = 1;
+                wake_up(&gsm->event);
+        }
+        spin_unlock_irqrestore(&gsm->control_lock, flags);
+}
+
+/**
+ *      gsm_control_transmit    -       send control packet
+ *      @gsm: gsm mux
+ *      @ctrl: frame to send
+ *
+ *      Send out a pending control command (called under control lock)
+ */
+
+static void gsm_control_transmit(struct gsm_mux *gsm, struct gsm_control *ctrl)
+{
+        struct gsm_msg *msg = gsm_data_alloc(gsm, 0, ctrl->len + 1, gsm->ftype);
+        if (msg == NULL)
+                return;
+        msg->data[0] = (ctrl->cmd << 1) | 2 | EA;       /* command */
+        memcpy(msg->data + 1, ctrl->data, ctrl->len);
+        gsm_data_queue(gsm->dlci[0], msg);
+}
+
+/**
+ *      gsm_control_retransmit  -       retransmit a control frame
+ *      @data: pointer to our gsm object
+ *
+ *      Called off the T2 timer expiry in order to retransmit control frames
+ *      that have been lost in the system somewhere. The control_lock protects
+ *      us from colliding with another sender or a receive completion event.
+ *      In that situation the timer may still occur in a small window but
+ *      gsm->pending_cmd will be NULL and we just let the timer expire.
+ */
+
+static void gsm_control_retransmit(unsigned long data)
+{
+        struct gsm_mux *gsm = (struct gsm_mux *)data;
+        struct gsm_control *ctrl;
+        unsigned long flags;
+        spin_lock_irqsave(&gsm->control_lock, flags);
+        ctrl = gsm->pending_cmd;
+        if (ctrl) {
+                gsm->cretries--;
+                if (gsm->cretries == 0) {
+                        gsm->pending_cmd = NULL;
+                        ctrl->error = -ETIMEDOUT;
+                        ctrl->done = 1;
+                        spin_unlock_irqrestore(&gsm->control_lock, flags);
+                        wake_up(&gsm->event);
+                        return;
+                }
+                gsm_control_transmit(gsm, ctrl);
+                mod_timer(&gsm->t2_timer, jiffies + gsm->t2 * HZ / 100);
+        }
+        spin_unlock_irqrestore(&gsm->control_lock, flags);
+}
+
+/**
+ *      gsm_control_send        -       send a control frame on DLCI 0
+ *      @gsm: the GSM channel
+ *      @command: command  to send including CR bit
+ *      @data: bytes of data (must be kmalloced)
+ *      @len: length of the block to send
+ *
+ *      Queue and dispatch a control command. Only one command can be
+ *      active at a time. In theory more can be outstanding but the matching
+ *      gets really complicated so for now stick to one outstanding.
+ */
+
+static struct gsm_control *gsm_control_send(struct gsm_mux *gsm,
+                unsigned int command, u8 *data, int clen)
+{
+        struct gsm_control *ctrl = kzalloc(sizeof(struct gsm_control),
+                                                GFP_KERNEL);
+        unsigned long flags;
+        if (ctrl == NULL)
+                return NULL;
+retry:
+        wait_event(gsm->event, gsm->pending_cmd == NULL);
+        spin_lock_irqsave(&gsm->control_lock, flags);
+        if (gsm->pending_cmd != NULL) {
+                spin_unlock_irqrestore(&gsm->control_lock, flags);
+                goto retry;
+        }
+        ctrl->cmd = command;
+        ctrl->data = data;
+        ctrl->len = clen;
+        gsm->pending_cmd = ctrl;
+        gsm->cretries = gsm->n2;
+        mod_timer(&gsm->t2_timer, jiffies + gsm->t2 * HZ / 100);
+        gsm_control_transmit(gsm, ctrl);
+        spin_unlock_irqrestore(&gsm->control_lock, flags);
+        return ctrl;
+}
+
+/**
+ *      gsm_control_wait        -       wait for a control to finish
+ *      @gsm: GSM mux
+ *      @control: control we are waiting on
+ *
+ *      Waits for the control to complete or time out. Frees any used
+ *      resources and returns 0 for success, or an error if the remote
+ *      rejected or ignored the request.
+ */
+
+static int gsm_control_wait(struct gsm_mux *gsm, struct gsm_control *control)
+{
+        int err;
+        wait_event(gsm->event, control->done == 1);
+        err = control->error;
+        kfree(control);
+        return err;
+}
+
+
+/*
+ *      DLCI level handling: Needs krefs
+ */
+
+/*
+ *      State transitions and timers
+ */
+
+/**
+ *      gsm_dlci_close          -       a DLCI has closed
+ *      @dlci: DLCI that closed
+ *
+ *      Perform processing when moving a DLCI into closed state. If there
+ *      is an attached tty this is hung up
+ */
+
+static void gsm_dlci_close(struct gsm_dlci *dlci)
+{
+        del_timer(&dlci->t1);
+        if (debug & 8)
+                pr_debug("DLCI %d goes closed.\n", dlci->addr);
+        dlci->state = DLCI_CLOSED;
+        if (dlci->addr != 0) {
+                struct tty_struct  *tty = tty_port_tty_get(&dlci->port);
+                if (tty) {
+                        tty_hangup(tty);
+                        tty_kref_put(tty);
+                }
+                kfifo_reset(dlci->fifo);
+        } else
+                dlci->gsm->dead = 1;
+        wake_up(&dlci->gsm->event);
+        /* A DLCI 0 close is a MUX termination so we need to kick that
+           back to userspace somehow */
+}
+
+/**
+ *      gsm_dlci_open           -       a DLCI has opened
+ *      @dlci: DLCI that opened
+ *
+ *      Perform processing when moving a DLCI into open state.
+ */
+
+static void gsm_dlci_open(struct gsm_dlci *dlci)
+{
+        /* Note that SABM UA .. SABM UA first UA lost can mean that we go
+           open -> open */
+        del_timer(&dlci->t1);
+        /* This will let a tty open continue */
+        dlci->state = DLCI_OPEN;
+        if (debug & 8)
+                pr_debug("DLCI %d goes open.\n", dlci->addr);
+        wake_up(&dlci->gsm->event);
+}
+
+/**
+ *      gsm_dlci_t1             -       T1 timer expiry
+ *      @dlci: DLCI that opened
+ *
+ *      The T1 timer handles retransmits of control frames (essentially of
+ *      SABM and DISC). We resend the command until the retry count runs out
+ *      in which case an opening port goes back to closed and a closing port
+ *      is simply put into closed state (any further frames from the other
+ *      end will get a DM response)
+ */
+
+static void gsm_dlci_t1(unsigned long data)
+{
+        struct gsm_dlci *dlci = (struct gsm_dlci *)data;
+        struct gsm_mux *gsm = dlci->gsm;
+
+        switch (dlci->state) {
+        case DLCI_OPENING:
+                dlci->retries--;
+                if (dlci->retries) {
+                        gsm_command(dlci->gsm, dlci->addr, SABM|PF);
+                        mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100);
+                } else
+                        gsm_dlci_close(dlci);
+                break;
+        case DLCI_CLOSING:
+                dlci->retries--;
+                if (dlci->retries) {
+                        gsm_command(dlci->gsm, dlci->addr, DISC|PF);
+                        mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100);
+                } else
+                        gsm_dlci_close(dlci);
+                break;
+        }
+}
+
+/**
+ *      gsm_dlci_begin_open     -       start channel open procedure
+ *      @dlci: DLCI to open
+ *
+ *      Commence opening a DLCI from the Linux side. We issue SABM messages
+ *      to the modem which should then reply with a UA, at which point we
+ *      will move into open state. Opening is done asynchronously with retry
+ *      running off timers and the responses.
+ */
+
+static void gsm_dlci_begin_open(struct gsm_dlci *dlci)
+{
+        struct gsm_mux *gsm = dlci->gsm;
+        if (dlci->state == DLCI_OPEN || dlci->state == DLCI_OPENING)
+                return;
+        dlci->retries = gsm->n2;
+        dlci->state = DLCI_OPENING;
+        gsm_command(dlci->gsm, dlci->addr, SABM|PF);
+        mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100);
+}
+
+/**
+ *      gsm_dlci_begin_close    -       start channel open procedure
+ *      @dlci: DLCI to open
+ *
+ *      Commence closing a DLCI from the Linux side. We issue DISC messages
+ *      to the modem which should then reply with a UA, at which point we
+ *      will move into closed state. Closing is done asynchronously with retry
+ *      off timers. We may also receive a DM reply from the other end which
+ *      indicates the channel was already closed.
+ */
+
+static void gsm_dlci_begin_close(struct gsm_dlci *dlci)
+{
+        struct gsm_mux *gsm = dlci->gsm;
+        if (dlci->state == DLCI_CLOSED || dlci->state == DLCI_CLOSING)
+                return;
+        dlci->retries = gsm->n2;
+        dlci->state = DLCI_CLOSING;
+        gsm_command(dlci->gsm, dlci->addr, DISC|PF);
+        mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100);
+}
+
+/**
+ *      gsm_dlci_data           -       data arrived
+ *      @dlci: channel
+ *      @data: block of bytes received
+ *      @len: length of received block
+ *
+ *      A UI or UIH frame has arrived which contains data for a channel
+ *      other than the control channel. If the relevant virtual tty is
+ *      open we shovel the bits down it, if not we drop them.
+ */
+
+static void gsm_dlci_data(struct gsm_dlci *dlci, u8 *data, int clen)
+{
+        /* krefs .. */
+        struct tty_port *port = &dlci->port;
+        struct tty_struct *tty = tty_port_tty_get(port);
+        unsigned int modem = 0;
+        int len = clen;
+
+        if (debug & 16)
+                pr_debug("%d bytes for tty %p\n", len, tty);
+        if (tty) {
+                switch (dlci->adaption)  {
+                /* Unsupported types */
+                /* Packetised interruptible data */
+                case 4:
+                        break;
+                /* Packetised uininterruptible voice/data */
+                case 3:
+                        break;
+                /* Asynchronous serial with line state in each frame */
+                case 2:
+                        while (gsm_read_ea(&modem, *data++) == 0) {
+                                len--;
+                                if (len == 0)
+                                        return;
+                        }
+                        gsm_process_modem(tty, dlci, modem, clen);
+                /* Line state will go via DLCI 0 controls only */
+                case 1:
+                default:
+                        tty_insert_flip_string(tty, data, len);
+                        tty_flip_buffer_push(tty);
+                }
+                tty_kref_put(tty);
+        }
+}
+
+/**
+ *      gsm_dlci_control        -       data arrived on control channel
+ *      @dlci: channel
+ *      @data: block of bytes received
+ *      @len: length of received block
+ *
+ *      A UI or UIH frame has arrived which contains data for DLCI 0 the
+ *      control channel. This should contain a command EA followed by
+ *      control data bytes. The command EA contains a command/response bit
+ *      and we divide up the work accordingly.
+ */
+
+static void gsm_dlci_command(struct gsm_dlci *dlci, u8 *data, int len)
+{
+        /* See what command is involved */
+        unsigned int command = 0;
+        while (len-- > 0) {
+                if (gsm_read_ea(&command, *data++) == 1) {
+                        int clen = *data++;
+                        len--;
+                        /* FIXME: this is properly an EA */
+                        clen >>= 1;
+                        /* Malformed command ? */
+                        if (clen > len)
+                                return;
+                        if (command & 1)
+                                gsm_control_message(dlci->gsm, command,
+                                                                data, clen);
+                        else
+                                gsm_control_response(dlci->gsm, command,
+                                                                data, clen);
+                        return;
+                }
+        }
+}
+
+/*
+ *      Allocate/Free DLCI channels
+ */
+
+/**
+ *      gsm_dlci_alloc          -       allocate a DLCI
+ *      @gsm: GSM mux
+ *      @addr: address of the DLCI
+ *
+ *      Allocate and install a new DLCI object into the GSM mux.
+ *
+ *      FIXME: review locking races
+ */
+
+static struct gsm_dlci *gsm_dlci_alloc(struct gsm_mux *gsm, int addr)
+{
+        struct gsm_dlci *dlci = kzalloc(sizeof(struct gsm_dlci), GFP_ATOMIC);
+        if (dlci == NULL)
+                return NULL;
+        spin_lock_init(&dlci->lock);
+        dlci->fifo = &dlci->_fifo;
+        if (kfifo_alloc(&dlci->_fifo, 4096, GFP_KERNEL) < 0) {
+                kfree(dlci);
+                return NULL;
+        }
+
+        skb_queue_head_init(&dlci->skb_list);
+        init_timer(&dlci->t1);
+        dlci->t1.function = gsm_dlci_t1;
+        dlci->t1.data = (unsigned long)dlci;
+        tty_port_init(&dlci->port);
+        dlci->port.ops = &gsm_port_ops;
+        dlci->gsm = gsm;
+        dlci->addr = addr;
+        dlci->adaption = gsm->adaption;
+        dlci->state = DLCI_CLOSED;
+        if (addr)
+                dlci->data = gsm_dlci_data;
+        else
+                dlci->data = gsm_dlci_command;
+        gsm->dlci[addr] = dlci;
+        return dlci;
+}
+
+/**
+ *      gsm_dlci_free           -       release DLCI
+ *      @dlci: DLCI to destroy
+ *
+ *      Free up a DLCI. Currently to keep the lifetime rules sane we only
+ *      clean up DLCI objects when the MUX closes rather than as the port
+ *      is closed down on both the tty and mux levels.
+ *
+ *      Can sleep.
+ */
+static void gsm_dlci_free(struct gsm_dlci *dlci)
+{
+        struct tty_struct *tty = tty_port_tty_get(&dlci->port);
+        if (tty) {
+                tty_vhangup(tty);
+                tty_kref_put(tty);
+        }
+        del_timer_sync(&dlci->t1);
+        dlci->gsm->dlci[dlci->addr] = NULL;
+        kfifo_free(dlci->fifo);
+        kfree(dlci);
+}
+
+/*
+ *      LAPBish link layer logic
+ */
+
+/**
+ *      gsm_queue               -       a GSM frame is ready to process
+ *      @gsm: pointer to our gsm mux
+ *
+ *      At this point in time a frame has arrived and been demangled from
+ *      the line encoding. All the differences between the encodings have
+ *      been handled below us and the frame is unpacked into the structures.
+ *      The fcs holds the header FCS but any data FCS must be added here.
+ */
+
+static void gsm_queue(struct gsm_mux *gsm)
+{
+        struct gsm_dlci *dlci;
+        u8 cr;
+        int address;
+        /* We have to sneak a look at the packet body to do the FCS.
+           A somewhat layering violation in the spec */
+
+        if ((gsm->control & ~PF) == UI)
+                gsm->fcs = gsm_fcs_add_block(gsm->fcs, gsm->buf, gsm->len);
+        if (gsm->encoding == 0){
+                /* WARNING: gsm->received_fcs is used for gsm->encoding = 0 only.
+                            In this case it contain the last piece of data
+                            required to generate final CRC */
+                gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->received_fcs);
+        }
+        if (gsm->fcs != GOOD_FCS) {
+                gsm->bad_fcs++;
+                if (debug & 4)
+                        pr_debug("BAD FCS %02x\n", gsm->fcs);
+                return;
+        }
+        address = gsm->address >> 1;
+        if (address >= NUM_DLCI)
+                goto invalid;
+
+        cr = gsm->address & 1;          /* C/R bit */
+
+        gsm_print_packet("<--", address, cr, gsm->control, gsm->buf, gsm->len);
+
+        cr ^= 1 - gsm->initiator;       /* Flip so 1 always means command */
+        dlci = gsm->dlci[address];
+
+        switch (gsm->control) {
+        case SABM|PF:
+                if (cr == 0)
+                        goto invalid;
+                if (dlci == NULL)
+                        dlci = gsm_dlci_alloc(gsm, address);
+                if (dlci == NULL)
+                        return;
+                if (dlci->dead)
+                        gsm_response(gsm, address, DM);
+                else {
+                        gsm_response(gsm, address, UA);
+                        gsm_dlci_open(dlci);
+                }
+                break;
+        case DISC|PF:
+                if (cr == 0)
+                        goto invalid;
+                if (dlci == NULL || dlci->state == DLCI_CLOSED) {
+                        gsm_response(gsm, address, DM);
+                        return;
+                }
+                /* Real close complete */
+                gsm_response(gsm, address, UA);
+                gsm_dlci_close(dlci);
+                break;
+        case UA:
+        case UA|PF:
+                if (cr == 0 || dlci == NULL)
+                        break;
+                switch (dlci->state) {
+                case DLCI_CLOSING:
+                        gsm_dlci_close(dlci);
+                        break;
+                case DLCI_OPENING:
+                        gsm_dlci_open(dlci);
+                        break;
+                }
+                break;
+        case DM:        /* DM can be valid unsolicited */
+        case DM|PF:
+                if (cr)
+                        goto invalid;
+                if (dlci == NULL)
+                        return;
+                gsm_dlci_close(dlci);
+                break;
+        case UI:
+        case UI|PF:
+        case UIH:
+        case UIH|PF:
+#if 0
+                if (cr)
+                        goto invalid;
+#endif
+                if (dlci == NULL || dlci->state != DLCI_OPEN) {
+                        gsm_command(gsm, address, DM|PF);
+                        return;
+                }
+                dlci->data(dlci, gsm->buf, gsm->len);
+                break;
+        default:
+                goto invalid;
+        }
+        return;
+invalid:
+        gsm->malformed++;
+        return;
+}
+
+
+/**
+ *      gsm0_receive    -       perform processing for non-transparency
+ *      @gsm: gsm data for this ldisc instance
+ *      @c: character
+ *
+ *      Receive bytes in gsm mode 0
+ */
+
+static void gsm0_receive(struct gsm_mux *gsm, unsigned char c)
+{
+        unsigned int len;
+
+        switch (gsm->state) {
+        case GSM_SEARCH:        /* SOF marker */
+                if (c == GSM0_SOF) {
+                        gsm->state = GSM_ADDRESS;
+                        gsm->address = 0;
+                        gsm->len = 0;
+                        gsm->fcs = INIT_FCS;
+                }
+                break;
+        case GSM_ADDRESS:       /* Address EA */
+                gsm->fcs = gsm_fcs_add(gsm->fcs, c);
+                if (gsm_read_ea(&gsm->address, c))
+                        gsm->state = GSM_CONTROL;
+                break;
+        case GSM_CONTROL:       /* Control Byte */
+                gsm->fcs = gsm_fcs_add(gsm->fcs, c);
+                gsm->control = c;
+                gsm->state = GSM_LEN0;
+                break;
+        case GSM_LEN0:          /* Length EA */
+                gsm->fcs = gsm_fcs_add(gsm->fcs, c);
+                if (gsm_read_ea(&gsm->len, c)) {
+                        if (gsm->len > gsm->mru) {
+                                gsm->bad_size++;
+                                gsm->state = GSM_SEARCH;
+                                break;
+                        }
+                        gsm->count = 0;
+                        if (!gsm->len)
+                                gsm->state = GSM_FCS;
+                        else
+                                gsm->state = GSM_DATA;
+                        break;
+                }
+                gsm->state = GSM_LEN1;
+                break;
+        case GSM_LEN1:
+                gsm->fcs = gsm_fcs_add(gsm->fcs, c);
+                len = c;
+                gsm->len |= len << 7;
+                if (gsm->len > gsm->mru) {
+                        gsm->bad_size++;
+                        gsm->state = GSM_SEARCH;
+                        break;
+                }
+                gsm->count = 0;
+                if (!gsm->len)
+                        gsm->state = GSM_FCS;
+                else
+                        gsm->state = GSM_DATA;
+                break;
+        case GSM_DATA:          /* Data */
+                gsm->buf[gsm->count++] = c;
+                if (gsm->count == gsm->len)
+                        gsm->state = GSM_FCS;
+                break;
+        case GSM_FCS:           /* FCS follows the packet */
+                gsm->received_fcs = c;
+                if (c == GSM0_SOF) {
+                        gsm->state = GSM_SEARCH;
+                        break;
+                }
+                gsm_queue(gsm);
+                gsm->state = GSM_SSOF;
+                break;
+        case GSM_SSOF:
+                if (c == GSM0_SOF) {
+                        gsm->state = GSM_SEARCH;
+                        break;
+                }
+                break;
+        }
+}
+
+/**
+ *      gsm1_receive    -       perform processing for non-transparency
+ *      @gsm: gsm data for this ldisc instance
+ *      @c: character
+ *
+ *      Receive bytes in mode 1 (Advanced option)
+ */
+
+static void gsm1_receive(struct gsm_mux *gsm, unsigned char c)
+{
+        if (c == GSM1_SOF) {
+                /* EOF is only valid in frame if we have got to the data state
+                   and received at least one byte (the FCS) */
+                if (gsm->state == GSM_DATA && gsm->count) {
+                        /* Extract the FCS */
+                        gsm->count--;
+                        gsm->fcs = gsm_fcs_add(gsm->fcs, gsm->buf[gsm->count]);
+                        gsm->len = gsm->count;
+                        gsm_queue(gsm);
+                        gsm->state  = GSM_START;
+                        return;
+                }
+                /* Any partial frame was a runt so go back to start */
+                if (gsm->state != GSM_START) {
+                        gsm->malformed++;
+                        gsm->state = GSM_START;
+                }
+                /* A SOF in GSM_START means we are still reading idling or
+                   framing bytes */
+                return;
+        }
+
+        if (c == GSM1_ESCAPE) {
+                gsm->escape = 1;
+                return;
+        }
+
+        /* Only an unescaped SOF gets us out of GSM search */
+        if (gsm->state == GSM_SEARCH)
+                return;
+
+        if (gsm->escape) {
+                c ^= GSM1_ESCAPE_BITS;
+                gsm->escape = 0;
+        }
+        switch (gsm->state) {
+        case GSM_START:         /* First byte after SOF */
+                gsm->address = 0;
+                gsm->state = GSM_ADDRESS;
+                gsm->fcs = INIT_FCS;
+                /* Drop through */
+        case GSM_ADDRESS:       /* Address continuation */
+                gsm->fcs = gsm_fcs_add(gsm->fcs, c);
+                if (gsm_read_ea(&gsm->address, c))
+                        gsm->state = GSM_CONTROL;
+                break;
+        case GSM_CONTROL:       /* Control Byte */
+                gsm->fcs = gsm_fcs_add(gsm->fcs, c);
+                gsm->control = c;
+                gsm->count = 0;
+                gsm->state = GSM_DATA;
+                break;
+        case GSM_DATA:          /* Data */
+                if (gsm->count > gsm->mru) {    /* Allow one for the FCS */
+                        gsm->state = GSM_OVERRUN;
+                        gsm->bad_size++;
+                } else
+                        gsm->buf[gsm->count++] = c;
+                break;
+        case GSM_OVERRUN:       /* Over-long - eg a dropped SOF */
+                break;
+        }
+}
+
+/**
+ *      gsm_error               -       handle tty error
+ *      @gsm: ldisc data
+ *      @data: byte received (may be invalid)
+ *      @flag: error received
+ *
+ *      Handle an error in the receipt of data for a frame. Currently we just
+ *      go back to hunting for a SOF.
+ *
+ *      FIXME: better diagnostics ?
+ */
+
+static void gsm_error(struct gsm_mux *gsm,
+                                unsigned char data, unsigned char flag)
+{
+        gsm->state = GSM_SEARCH;
+        gsm->io_error++;
+}
+
+/**
+ *      gsm_cleanup_mux         -       generic GSM protocol cleanup
+ *      @gsm: our mux
+ *
+ *      Clean up the bits of the mux which are the same for all framing
+ *      protocols. Remove the mux from the mux table, stop all the timers
+ *      and then shut down each device hanging up the channels as we go.
+ */
+
+void gsm_cleanup_mux(struct gsm_mux *gsm)
+{
+        int i;
+        struct gsm_dlci *dlci = gsm->dlci[0];
+        struct gsm_msg *txq;
+
+        gsm->dead = 1;
+
+        spin_lock(&gsm_mux_lock);
+        for (i = 0; i < MAX_MUX; i++) {
+                if (gsm_mux[i] == gsm) {
+                        gsm_mux[i] = NULL;
+                        break;
+                }
+        }
+        spin_unlock(&gsm_mux_lock);
+        WARN_ON(i == MAX_MUX);
+
+        del_timer_sync(&gsm->t2_timer);
+        /* Now we are sure T2 has stopped */
+        if (dlci) {
+                dlci->dead = 1;
+                gsm_dlci_begin_close(dlci);
+                wait_event_interruptible(gsm->event,
+                                        dlci->state == DLCI_CLOSED);
+        }
+        /* Free up any link layer users */
+        for (i = 0; i < NUM_DLCI; i++)
+                if (gsm->dlci[i])
+                        gsm_dlci_free(gsm->dlci[i]);
+        /* Now wipe the queues */
+        for (txq = gsm->tx_head; txq != NULL; txq = gsm->tx_head) {
+                gsm->tx_head = txq->next;
+                kfree(txq);
+        }
+        gsm->tx_tail = NULL;
+}
+EXPORT_SYMBOL_GPL(gsm_cleanup_mux);
+
+/**
+ *      gsm_activate_mux        -       generic GSM setup
+ *      @gsm: our mux
+ *
+ *      Set up the bits of the mux which are the same for all framing
+ *      protocols. Add the mux to the mux table so it can be opened and
+ *      finally kick off connecting to DLCI 0 on the modem.
+ */
+
+int gsm_activate_mux(struct gsm_mux *gsm)
+{
+        struct gsm_dlci *dlci;
+        int i = 0;
+
+        init_timer(&gsm->t2_timer);
+        gsm->t2_timer.function = gsm_control_retransmit;
+        gsm->t2_timer.data = (unsigned long)gsm;
+        init_waitqueue_head(&gsm->event);
+        spin_lock_init(&gsm->control_lock);
+        spin_lock_init(&gsm->tx_lock);
+
+        if (gsm->encoding == 0)
+                gsm->receive = gsm0_receive;
+        else
+                gsm->receive = gsm1_receive;
+        gsm->error = gsm_error;
+
+        spin_lock(&gsm_mux_lock);
+        for (i = 0; i < MAX_MUX; i++) {
+                if (gsm_mux[i] == NULL) {
+                        gsm_mux[i] = gsm;
+                        break;
+                }
+        }
+        spin_unlock(&gsm_mux_lock);
+        if (i == MAX_MUX)
+                return -EBUSY;
+
+        dlci = gsm_dlci_alloc(gsm, 0);
+        if (dlci == NULL)
+                return -ENOMEM;
+        gsm->dead = 0;          /* Tty opens are now permissible */
+        return 0;
+}
+EXPORT_SYMBOL_GPL(gsm_activate_mux);
+
+/**
+ *      gsm_free_mux            -       free up a mux
+ *      @mux: mux to free
+ *
+ *      Dispose of allocated resources for a dead mux. No refcounting
+ *      at present so the mux must be truly dead.
+ */
+void gsm_free_mux(struct gsm_mux *gsm)
+{
+        kfree(gsm->txframe);
+        kfree(gsm->buf);
+        kfree(gsm);
+}
+EXPORT_SYMBOL_GPL(gsm_free_mux);
+
+/**
+ *      gsm_alloc_mux           -       allocate a mux
+ *
+ *      Creates a new mux ready for activation.
+ */
+
+struct gsm_mux *gsm_alloc_mux(void)
+{
+        struct gsm_mux *gsm = kzalloc(sizeof(struct gsm_mux), GFP_KERNEL);
+        if (gsm == NULL)
+                return NULL;
+        gsm->buf = kmalloc(MAX_MRU + 1, GFP_KERNEL);
+        if (gsm->buf == NULL) {
+                kfree(gsm);
+                return NULL;
+        }
+        gsm->txframe = kmalloc(2 * MAX_MRU + 2, GFP_KERNEL);
+        if (gsm->txframe == NULL) {
+                kfree(gsm->buf);
+                kfree(gsm);
+                return NULL;
+        }
+        spin_lock_init(&gsm->lock);
+
+        gsm->t1 = T1;
+        gsm->t2 = T2;
+        gsm->n2 = N2;
+        gsm->ftype = UIH;
+        gsm->initiator = 0;
+        gsm->adaption = 1;
+        gsm->encoding = 1;
+        gsm->mru = 64;  /* Default to encoding 1 so these should be 64 */
+        gsm->mtu = 64;
+        gsm->dead = 1;  /* Avoid early tty opens */
+
+        return gsm;
+}
+EXPORT_SYMBOL_GPL(gsm_alloc_mux);
+
+/**
+ *      gsmld_output            -       write to link
+ *      @gsm: our mux
+ *      @data: bytes to output
+ *      @len: size
+ *
+ *      Write a block of data from the GSM mux to the data channel. This
+ *      will eventually be serialized from above but at the moment isn't.
+ */
+
+static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len)
+{
+        if (tty_write_room(gsm->tty) < len) {
+                set_bit(TTY_DO_WRITE_WAKEUP, &gsm->tty->flags);
+                return -ENOSPC;
+        }
+        if (debug & 4)
+                print_hex_dump_bytes("gsmld_output: ", DUMP_PREFIX_OFFSET,
+                                     data, len);
+        gsm->tty->ops->write(gsm->tty, data, len);
+        return len;
+}
+
+/**
+ *      gsmld_attach_gsm        -       mode set up
+ *      @tty: our tty structure
+ *      @gsm: our mux
+ *
+ *      Set up the MUX for basic mode and commence connecting to the
+ *      modem. Currently called from the line discipline set up but
+ *      will need moving to an ioctl path.
+ */
+
+static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
+{
+        int ret;
+
+        gsm->tty = tty_kref_get(tty);
+        gsm->output = gsmld_output;
+        ret =  gsm_activate_mux(gsm);
+        if (ret != 0)
+                tty_kref_put(gsm->tty);
+        return ret;
+}
+
+
+/**
+ *      gsmld_detach_gsm        -       stop doing 0710 mux
+ *      @tty: tty attached to the mux
+ *      @gsm: mux
+ *
+ *      Shutdown and then clean up the resources used by the line discipline
+ */
+
+static void gsmld_detach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
+{
+        WARN_ON(tty != gsm->tty);
+        gsm_cleanup_mux(gsm);
+        tty_kref_put(gsm->tty);
+        gsm->tty = NULL;
+}
+
+static void gsmld_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+                              char *fp, int count)
+{
+        struct gsm_mux *gsm = tty->disc_data;
+        const unsigned char *dp;
+        char *f;
+        int i;
+        char buf[64];
+        char flags;
+
+        if (debug & 4)
+                print_hex_dump_bytes("gsmld_receive: ", DUMP_PREFIX_OFFSET,
+                                     cp, count);
+
+        for (i = count, dp = cp, f = fp; i; i--, dp++) {
+                flags = *f++;
+                switch (flags) {
+                case TTY_NORMAL:
+                        gsm->receive(gsm, *dp);
+                        break;
+                case TTY_OVERRUN:
+                case TTY_BREAK:
+                case TTY_PARITY:
+                case TTY_FRAME:
+                        gsm->error(gsm, *dp, flags);
+                        break;
+                default:
+                        WARN_ONCE("%s: unknown flag %d\n",
+                               tty_name(tty, buf), flags);
+                        break;
+                }
+        }
+        /* FASYNC if needed ? */
+        /* If clogged call tty_throttle(tty); */
+}
+
+/**
+ *      gsmld_chars_in_buffer   -       report available bytes
+ *      @tty: tty device
+ *
+ *      Report the number of characters buffered to be delivered to user
+ *      at this instant in time.
+ *
+ *      Locking: gsm lock
+ */
+
+static ssize_t gsmld_chars_in_buffer(struct tty_struct *tty)
+{
+        return 0;
+}
+
+/**
+ *      gsmld_flush_buffer      -       clean input queue
+ *      @tty:   terminal device
+ *
+ *      Flush the input buffer. Called when the line discipline is
+ *      being closed, when the tty layer wants the buffer flushed (eg
+ *      at hangup).
+ */
+
+static void gsmld_flush_buffer(struct tty_struct *tty)
+{
+}
+
+/**
+ *      gsmld_close             -       close the ldisc for this tty
+ *      @tty: device
+ *
+ *      Called from the terminal layer when this line discipline is
+ *      being shut down, either because of a close or becsuse of a
+ *      discipline change. The function will not be called while other
+ *      ldisc methods are in progress.
+ */
+
+static void gsmld_close(struct tty_struct *tty)
+{
+        struct gsm_mux *gsm = tty->disc_data;
+
+        gsmld_detach_gsm(tty, gsm);
+
+        gsmld_flush_buffer(tty);
+        /* Do other clean up here */
+        gsm_free_mux(gsm);
+}
+
+/**
+ *      gsmld_open              -       open an ldisc
+ *      @tty: terminal to open
+ *
+ *      Called when this line discipline is being attached to the
+ *      terminal device. Can sleep. Called serialized so that no
+ *      other events will occur in parallel. No further open will occur
+ *      until a close.
+ */
+
+static int gsmld_open(struct tty_struct *tty)
+{
+        struct gsm_mux *gsm;
+
+        if (tty->ops->write == NULL)
+                return -EINVAL;
+
+        /* Attach our ldisc data */
+        gsm = gsm_alloc_mux();
+        if (gsm == NULL)
+                return -ENOMEM;
+
+        tty->disc_data = gsm;
+        tty->receive_room = 65536;
+
+        /* Attach the initial passive connection */
+        gsm->encoding = 1;
+        return gsmld_attach_gsm(tty, gsm);
+}
+
+/**
+ *      gsmld_write_wakeup      -       asynchronous I/O notifier
+ *      @tty: tty device
+ *
+ *      Required for the ptys, serial driver etc. since processes
+ *      that attach themselves to the master and rely on ASYNC
+ *      IO must be woken up
+ */
+
+static void gsmld_write_wakeup(struct tty_struct *tty)
+{
+        struct gsm_mux *gsm = tty->disc_data;
+        unsigned long flags;
+
+        /* Queue poll */
+        clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+        gsm_data_kick(gsm);
+        if (gsm->tx_bytes < TX_THRESH_LO) {
+                spin_lock_irqsave(&gsm->tx_lock, flags);
+                gsm_dlci_data_sweep(gsm);
+                spin_unlock_irqrestore(&gsm->tx_lock, flags);
+        }
+}
+
+/**
+ *      gsmld_read              -       read function for tty
+ *      @tty: tty device
+ *      @file: file object
+ *      @buf: userspace buffer pointer
+ *      @nr: size of I/O
+ *
+ *      Perform reads for the line discipline. We are guaranteed that the
+ *      line discipline will not be closed under us but we may get multiple
+ *      parallel readers and must handle this ourselves. We may also get
+ *      a hangup. Always called in user context, may sleep.
+ *
+ *      This code must be sure never to sleep through a hangup.
+ */
+
+static ssize_t gsmld_read(struct tty_struct *tty, struct file *file,
+                         unsigned char __user *buf, size_t nr)
+{
+        return -EOPNOTSUPP;
+}
+
+/**
+ *      gsmld_write             -       write function for tty
+ *      @tty: tty device
+ *      @file: file object
+ *      @buf: userspace buffer pointer
+ *      @nr: size of I/O
+ *
+ *      Called when the owner of the device wants to send a frame
+ *      itself (or some other control data). The data is transferred
+ *      as-is and must be properly framed and checksummed as appropriate
+ *      by userspace. Frames are either sent whole or not at all as this
+ *      avoids pain user side.
+ */
+
+static ssize_t gsmld_write(struct tty_struct *tty, struct file *file,
+                           const unsigned char *buf, size_t nr)
+{
+        int space = tty_write_room(tty);
+        if (space >= nr)
+                return tty->ops->write(tty, buf, nr);
+        set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+        return -ENOBUFS;
+}
+
+/**
+ *      gsmld_poll              -       poll method for N_GSM0710
+ *      @tty: terminal device
+ *      @file: file accessing it
+ *      @wait: poll table
+ *
+ *      Called when the line discipline is asked to poll() for data or
+ *      for special events. This code is not serialized with respect to
+ *      other events save open/close.
+ *
+ *      This code must be sure never to sleep through a hangup.
+ *      Called without the kernel lock held - fine
+ */
+
+static unsigned int gsmld_poll(struct tty_struct *tty, struct file *file,
+                                                        poll_table *wait)
+{
+        unsigned int mask = 0;
+        struct gsm_mux *gsm = tty->disc_data;
+
+        poll_wait(file, &tty->read_wait, wait);
+        poll_wait(file, &tty->write_wait, wait);
+        if (tty_hung_up_p(file))
+                mask |= POLLHUP;
+        if (!tty_is_writelocked(tty) && tty_write_room(tty) > 0)
+                mask |= POLLOUT | POLLWRNORM;
+        if (gsm->dead)
+                mask |= POLLHUP;
+        return mask;
+}
+
+static int gsmld_config(struct tty_struct *tty, struct gsm_mux *gsm,
+                                                        struct gsm_config *c)
+{
+        int need_close = 0;
+        int need_restart = 0;
+
+        /* Stuff we don't support yet - UI or I frame transport, windowing */
+        if ((c->adaption != 1 && c->adaption != 2) || c->k)
+                return -EOPNOTSUPP;
+        /* Check the MRU/MTU range looks sane */
+        if (c->mru > MAX_MRU || c->mtu > MAX_MTU || c->mru < 8 || c->mtu < 8)
+                return -EINVAL;
+        if (c->n2 < 3)
+                return -EINVAL;
+        if (c->encapsulation > 1)       /* Basic, advanced, no I */
+                return -EINVAL;
+        if (c->initiator > 1)
+                return -EINVAL;
+        if (c->i == 0 || c->i > 2)      /* UIH and UI only */
+                return -EINVAL;
+        /*
+         *      See what is needed for reconfiguration
+         */
+
+        /* Timing fields */
+        if (c->t1 != 0 && c->t1 != gsm->t1)
+                need_restart = 1;
+        if (c->t2 != 0 && c->t2 != gsm->t2)
+                need_restart = 1;
+        if (c->encapsulation != gsm->encoding)
+                need_restart = 1;
+        if (c->adaption != gsm->adaption)
+                need_restart = 1;
+        /* Requires care */
+        if (c->initiator != gsm->initiator)
+                need_close = 1;
+        if (c->mru != gsm->mru)
+                need_restart = 1;
+        if (c->mtu != gsm->mtu)
+                need_restart = 1;
+
+        /*
+         *      Close down what is needed, restart and initiate the new
+         *      configuration
+         */
+
+        if (need_close || need_restart) {
+                gsm_dlci_begin_close(gsm->dlci[0]);
+                /* This will timeout if the link is down due to N2 expiring */
+                wait_event_interruptible(gsm->event,
+                                gsm->dlci[0]->state == DLCI_CLOSED);
+                if (signal_pending(current))
+                        return -EINTR;
+        }
+        if (need_restart)
+                gsm_cleanup_mux(gsm);
+
+        gsm->initiator = c->initiator;
+        gsm->mru = c->mru;
+        gsm->mtu = c->mtu;
+        gsm->encoding = c->encapsulation;
+        gsm->adaption = c->adaption;
+        gsm->n2 = c->n2;
+
+        if (c->i == 1)
+                gsm->ftype = UIH;
+        else if (c->i == 2)
+                gsm->ftype = UI;
+
+        if (c->t1)
+                gsm->t1 = c->t1;
+        if (c->t2)
+                gsm->t2 = c->t2;
+
+        /* FIXME: We need to separate activation/deactivation from adding
+           and removing from the mux array */
+        if (need_restart)
+                gsm_activate_mux(gsm);
+        if (gsm->initiator && need_close)
+                gsm_dlci_begin_open(gsm->dlci[0]);
+        return 0;
+}
+
+static int gsmld_ioctl(struct tty_struct *tty, struct file *file,
+                       unsigned int cmd, unsigned long arg)
+{
+        struct gsm_config c;
+        struct gsm_mux *gsm = tty->disc_data;
+
+        switch (cmd) {
+        case GSMIOC_GETCONF:
+                memset(&c, 0, sizeof(c));
+                c.adaption = gsm->adaption;
+                c.encapsulation = gsm->encoding;
+                c.initiator = gsm->initiator;
+                c.t1 = gsm->t1;
+                c.t2 = gsm->t2;
+                c.t3 = 0;       /* Not supported */
+                c.n2 = gsm->n2;
+                if (gsm->ftype == UIH)
+                        c.i = 1;
+                else
+                        c.i = 2;
+                pr_debug("Ftype %d i %d\n", gsm->ftype, c.i);
+                c.mru = gsm->mru;
+                c.mtu = gsm->mtu;
+                c.k = 0;
+                if (copy_to_user((void *)arg, &c, sizeof(c)))
+                        return -EFAULT;
+                return 0;
+        case GSMIOC_SETCONF:
+                if (copy_from_user(&c, (void *)arg, sizeof(c)))
+                        return -EFAULT;
+                return gsmld_config(tty, gsm, &c);
+        default:
+                return n_tty_ioctl_helper(tty, file, cmd, arg);
+        }
+}
+
+
+/* Line discipline for real tty */
+struct tty_ldisc_ops tty_ldisc_packet = {
+        .owner           = THIS_MODULE,
+        .magic           = TTY_LDISC_MAGIC,
+        .name            = "n_gsm",
+        .open            = gsmld_open,
+        .close           = gsmld_close,
+        .flush_buffer    = gsmld_flush_buffer,
+        .chars_in_buffer = gsmld_chars_in_buffer,
+        .read            = gsmld_read,
+        .write           = gsmld_write,
+        .ioctl           = gsmld_ioctl,
+        .poll            = gsmld_poll,
+        .receive_buf     = gsmld_receive_buf,
+        .write_wakeup    = gsmld_write_wakeup
+};
+
+/*
+ *      Virtual tty side
+ */
+
+#define TX_SIZE         512
+
+static int gsmtty_modem_update(struct gsm_dlci *dlci, u8 brk)
+{
+        u8 modembits[5];
+        struct gsm_control *ctrl;
+        int len = 2;
+
+        if (brk)
+                len++;
+
+        modembits[0] = len << 1 | EA;           /* Data bytes */
+        modembits[1] = dlci->addr << 2 | 3;     /* DLCI, EA, 1 */
+        modembits[2] = gsm_encode_modem(dlci) << 1 | EA;
+        if (brk)
+                modembits[3] = brk << 4 | 2 | EA;       /* Valid, EA */
+        ctrl = gsm_control_send(dlci->gsm, CMD_MSC, modembits, len + 1);
+        if (ctrl == NULL)
+                return -ENOMEM;
+        return gsm_control_wait(dlci->gsm, ctrl);
+}
+
+static int gsm_carrier_raised(struct tty_port *port)
+{
+        struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port);
+        /* Not yet open so no carrier info */
+        if (dlci->state != DLCI_OPEN)
+                return 0;
+        if (debug & 2)
+                return 1;
+        return dlci->modem_rx & TIOCM_CD;
+}
+
+static void gsm_dtr_rts(struct tty_port *port, int onoff)
+{
+        struct gsm_dlci *dlci = container_of(port, struct gsm_dlci, port);
+        unsigned int modem_tx = dlci->modem_tx;
+        if (onoff)
+                modem_tx |= TIOCM_DTR | TIOCM_RTS;
+        else
+                modem_tx &= ~(TIOCM_DTR | TIOCM_RTS);
+        if (modem_tx != dlci->modem_tx) {
+                dlci->modem_tx = modem_tx;
+                gsmtty_modem_update(dlci, 0);
+        }
+}
+
+static const struct tty_port_operations gsm_port_ops = {
+        .carrier_raised = gsm_carrier_raised,
+        .dtr_rts = gsm_dtr_rts,
+};
+
+
+static int gsmtty_open(struct tty_struct *tty, struct file *filp)
+{
+        struct gsm_mux *gsm;
+        struct gsm_dlci *dlci;
+        struct tty_port *port;
+        unsigned int line = tty->index;
+        unsigned int mux = line >> 6;
+
+        line = line & 0x3F;
+
+        if (mux >= MAX_MUX)
+                return -ENXIO;
+        /* FIXME: we need to lock gsm_mux for lifetimes of ttys eventually */
+        if (gsm_mux[mux] == NULL)
+                return -EUNATCH;
+        if (line == 0 || line > 61)     /* 62/63 reserved */
+                return -ECHRNG;
+        gsm = gsm_mux[mux];
+        if (gsm->dead)
+                return -EL2HLT;
+        dlci = gsm->dlci[line];
+        if (dlci == NULL)
+                dlci = gsm_dlci_alloc(gsm, line);
+        if (dlci == NULL)
+                return -ENOMEM;
+        port = &dlci->port;
+        port->count++;
+        tty->driver_data = dlci;
+        tty_port_tty_set(port, tty);
+
+        dlci->modem_rx = 0;
+        /* We could in theory open and close before we wait - eg if we get
+           a DM straight back. This is ok as that will have caused a hangup */
+        set_bit(ASYNCB_INITIALIZED, &port->flags);
+        /* Start sending off SABM messages */
+        gsm_dlci_begin_open(dlci);
+        /* And wait for virtual carrier */
+        return tty_port_block_til_ready(port, tty, filp);
+}
+
+static void gsmtty_close(struct tty_struct *tty, struct file *filp)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        if (dlci == NULL)
+                return;
+        if (tty_port_close_start(&dlci->port, tty, filp) == 0)
+                return;
+        gsm_dlci_begin_close(dlci);
+        tty_port_close_end(&dlci->port, tty);
+        tty_port_tty_set(&dlci->port, NULL);
+}
+
+static void gsmtty_hangup(struct tty_struct *tty)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        tty_port_hangup(&dlci->port);
+        gsm_dlci_begin_close(dlci);
+}
+
+static int gsmtty_write(struct tty_struct *tty, const unsigned char *buf,
+                                                                    int len)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        /* Stuff the bytes into the fifo queue */
+        int sent = kfifo_in_locked(dlci->fifo, buf, len, &dlci->lock);
+        /* Need to kick the channel */
+        gsm_dlci_data_kick(dlci);
+        return sent;
+}
+
+static int gsmtty_write_room(struct tty_struct *tty)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        return TX_SIZE - kfifo_len(dlci->fifo);
+}
+
+static int gsmtty_chars_in_buffer(struct tty_struct *tty)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        return kfifo_len(dlci->fifo);
+}
+
+static void gsmtty_flush_buffer(struct tty_struct *tty)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        /* Caution needed: If we implement reliable transport classes
+           then the data being transmitted can't simply be junked once
+           it has first hit the stack. Until then we can just blow it
+           away */
+        kfifo_reset(dlci->fifo);
+        /* Need to unhook this DLCI from the transmit queue logic */
+}
+
+static void gsmtty_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        /* The FIFO handles the queue so the kernel will do the right
+           thing waiting on chars_in_buffer before calling us. No work
+           to do here */
+}
+
+static int gsmtty_tiocmget(struct tty_struct *tty)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        return dlci->modem_rx;
+}
+
+static int gsmtty_tiocmset(struct tty_struct *tty,
+        unsigned int set, unsigned int clear)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        unsigned int modem_tx = dlci->modem_tx;
+
+        modem_tx &= clear;
+        modem_tx |= set;
+
+        if (modem_tx != dlci->modem_tx) {
+                dlci->modem_tx = modem_tx;
+                return gsmtty_modem_update(dlci, 0);
+        }
+        return 0;
+}
+
+
+static int gsmtty_ioctl(struct tty_struct *tty,
+                        unsigned int cmd, unsigned long arg)
+{
+        return -ENOIOCTLCMD;
+}
+
+static void gsmtty_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+        /* For the moment its fixed. In actual fact the speed information
+           for the virtual channel can be propogated in both directions by
+           the RPN control message. This however rapidly gets nasty as we
+           then have to remap modem signals each way according to whether
+           our virtual cable is null modem etc .. */
+        tty_termios_copy_hw(tty->termios, old);
+}
+
+static void gsmtty_throttle(struct tty_struct *tty)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        if (tty->termios->c_cflag & CRTSCTS)
+                dlci->modem_tx &= ~TIOCM_DTR;
+        dlci->throttled = 1;
+        /* Send an MSC with DTR cleared */
+        gsmtty_modem_update(dlci, 0);
+}
+
+static void gsmtty_unthrottle(struct tty_struct *tty)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        if (tty->termios->c_cflag & CRTSCTS)
+                dlci->modem_tx |= TIOCM_DTR;
+        dlci->throttled = 0;
+        /* Send an MSC with DTR set */
+        gsmtty_modem_update(dlci, 0);
+}
+
+static int gsmtty_break_ctl(struct tty_struct *tty, int state)
+{
+        struct gsm_dlci *dlci = tty->driver_data;
+        int encode = 0; /* Off */
+
+        if (state == -1)        /* "On indefinitely" - we can't encode this
+                                    properly */
+                encode = 0x0F;
+        else if (state > 0) {
+                encode = state / 200;   /* mS to encoding */
+                if (encode > 0x0F)
+                        encode = 0x0F;  /* Best effort */
+        }
+        return gsmtty_modem_update(dlci, encode);
+}
+
+static struct tty_driver *gsm_tty_driver;
+
+/* Virtual ttys for the demux */
+static const struct tty_operations gsmtty_ops = {
+        .open                   = gsmtty_open,
+        .close                  = gsmtty_close,
+        .write                  = gsmtty_write,
+        .write_room             = gsmtty_write_room,
+        .chars_in_buffer        = gsmtty_chars_in_buffer,
+        .flush_buffer           = gsmtty_flush_buffer,
+        .ioctl                  = gsmtty_ioctl,
+        .throttle               = gsmtty_throttle,
+        .unthrottle             = gsmtty_unthrottle,
+        .set_termios            = gsmtty_set_termios,
+        .hangup                 = gsmtty_hangup,
+        .wait_until_sent        = gsmtty_wait_until_sent,
+        .tiocmget               = gsmtty_tiocmget,
+        .tiocmset               = gsmtty_tiocmset,
+        .break_ctl              = gsmtty_break_ctl,
+};
+
+
+
+static int __init gsm_init(void)
+{
+        /* Fill in our line protocol discipline, and register it */
+        int status = tty_register_ldisc(N_GSM0710, &tty_ldisc_packet);
+        if (status != 0) {
+                pr_err("n_gsm: can't register line discipline (err = %d)\n",
+                                                                status);
+                return status;
+        }
+
+        gsm_tty_driver = alloc_tty_driver(256);
+        if (!gsm_tty_driver) {
+                tty_unregister_ldisc(N_GSM0710);
+                pr_err("gsm_init: tty allocation failed.\n");
+                return -EINVAL;
+        }
+        gsm_tty_driver->owner   = THIS_MODULE;
+        gsm_tty_driver->driver_name     = "gsmtty";
+        gsm_tty_driver->name            = "gsmtty";
+        gsm_tty_driver->major           = 0;    /* Dynamic */
+        gsm_tty_driver->minor_start     = 0;
+        gsm_tty_driver->type            = TTY_DRIVER_TYPE_SERIAL;
+        gsm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+        gsm_tty_driver->flags   = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV
+                                                | TTY_DRIVER_HARDWARE_BREAK;
+        gsm_tty_driver->init_termios    = tty_std_termios;
+        /* Fixme */
+        gsm_tty_driver->init_termios.c_lflag &= ~ECHO;
+        tty_set_operations(gsm_tty_driver, &gsmtty_ops);
+
+        spin_lock_init(&gsm_mux_lock);
+
+        if (tty_register_driver(gsm_tty_driver)) {
+                put_tty_driver(gsm_tty_driver);
+                tty_unregister_ldisc(N_GSM0710);
+                pr_err("gsm_init: tty registration failed.\n");
+                return -EBUSY;
+        }
+        pr_debug("gsm_init: loaded as %d,%d.\n",
+                        gsm_tty_driver->major, gsm_tty_driver->minor_start);
+        return 0;
+}
+
+static void __exit gsm_exit(void)
+{
+        int status = tty_unregister_ldisc(N_GSM0710);
+        if (status != 0)
+                pr_err("n_gsm: can't unregister line discipline (err = %d)\n",
+                                                                status);
+        tty_unregister_driver(gsm_tty_driver);
+        put_tty_driver(gsm_tty_driver);
+}
+
+module_init(gsm_init);
+module_exit(gsm_exit);
+
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_LDISC(N_GSM0710);
diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
new file mode 100644
index 000000000000..cea56033b34c
--- /dev/null
+++ b/drivers/tty/n_hdlc.c
@@ -0,0 +1,1006 @@
+/* generic HDLC line discipline for Linux
+ *
+ * Written by Paul Fulghum paulkf@microgate.com
+ * for Microgate Corporation
+ *
+ * Microgate and SyncLink are registered trademarks of Microgate Corporation
+ *
+ * Adapted from ppp.c, written by Michael Callahan <callahan@maths.ox.ac.uk>,
+ *      Al Longyear <longyear@netcom.com>,
+ *      Paul Mackerras <Paul.Mackerras@cs.anu.edu.au>
+ *
+ * Original release 01/11/99
+ *
+ * This code is released under the GNU General Public License (GPL)
+ *
+ * This module implements the tty line discipline N_HDLC for use with
+ * tty device drivers that support bit-synchronous HDLC communications.
+ *
+ * All HDLC data is frame oriented which means:
+ *
+ * 1. tty write calls represent one complete transmit frame of data
+ *    The device driver should accept the complete frame or none of 
+ *    the frame (busy) in the write method. Each write call should have
+ *    a byte count in the range of 2-65535 bytes (2 is min HDLC frame
+ *    with 1 addr byte and 1 ctrl byte). The max byte count of 65535
+ *    should include any crc bytes required. For example, when using
+ *    CCITT CRC32, 4 crc bytes are required, so the maximum size frame
+ *    the application may transmit is limited to 65531 bytes. For CCITT
+ *    CRC16, the maximum application frame size would be 65533.
+ *
+ *
+ * 2. receive callbacks from the device driver represents
+ *    one received frame. The device driver should bypass
+ *    the tty flip buffer and call the line discipline receive
+ *    callback directly to avoid fragmenting or concatenating
+ *    multiple frames into a single receive callback.
+ *
+ *    The HDLC line discipline queues the receive frames in separate
+ *    buffers so complete receive frames can be returned by the
+ *    tty read calls.
+ *
+ * 3. tty read calls returns an entire frame of data or nothing.
+ *    
+ * 4. all send and receive data is considered raw. No processing
+ *    or translation is performed by the line discipline, regardless
+ *    of the tty flags
+ *
+ * 5. When line discipline is queried for the amount of receive
+ *    data available (FIOC), 0 is returned if no data available,
+ *    otherwise the count of the next available frame is returned.
+ *    (instead of the sum of all received frame counts).
+ *
+ * These conventions allow the standard tty programming interface
+ * to be used for synchronous HDLC applications when used with
+ * this line discipline (or another line discipline that is frame
+ * oriented such as N_PPP).
+ *
+ * The SyncLink driver (synclink.c) implements both asynchronous
+ * (using standard line discipline N_TTY) and synchronous HDLC
+ * (using N_HDLC) communications, with the latter using the above
+ * conventions.
+ *
+ * This implementation is very basic and does not maintain
+ * any statistics. The main point is to enforce the raw data
+ * and frame orientation of HDLC communications.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define HDLC_MAGIC 0x239e
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+
+#undef VERSION
+#define VERSION(major,minor,patch) (((((major)<<8)+(minor))<<8)+(patch))
+
+#include <linux/poll.h>
+#include <linux/in.h>
+#include <linux/ioctl.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>       /* used in new tty drivers */
+#include <linux/signal.h>       /* used in new tty drivers */
+#include <linux/if.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/termios.h>
+#include <asm/uaccess.h>
+
+/*
+ * Buffers for individual HDLC frames
+ */
+#define MAX_HDLC_FRAME_SIZE 65535 
+#define DEFAULT_RX_BUF_COUNT 10
+#define MAX_RX_BUF_COUNT 60
+#define DEFAULT_TX_BUF_COUNT 3
+
+struct n_hdlc_buf {
+        struct n_hdlc_buf *link;
+        int               count;
+        char              buf[1];
+};
+
+#define N_HDLC_BUF_SIZE (sizeof(struct n_hdlc_buf) + maxframe)
+
+struct n_hdlc_buf_list {
+        struct n_hdlc_buf *head;
+        struct n_hdlc_buf *tail;
+        int               count;
+        spinlock_t        spinlock;
+};
+
+/**
+ * struct n_hdlc - per device instance data structure
+ * @magic - magic value for structure
+ * @flags - miscellaneous control flags
+ * @tty - ptr to TTY structure
+ * @backup_tty - TTY to use if tty gets closed
+ * @tbusy - reentrancy flag for tx wakeup code
+ * @woke_up - FIXME: describe this field
+ * @tbuf - currently transmitting tx buffer
+ * @tx_buf_list - list of pending transmit frame buffers
+ * @rx_buf_list - list of received frame buffers
+ * @tx_free_buf_list - list unused transmit frame buffers
+ * @rx_free_buf_list - list unused received frame buffers
+ */
+struct n_hdlc {
+        int                     magic;
+        __u32                   flags;
+        struct tty_struct       *tty;
+        struct tty_struct       *backup_tty;
+        int                     tbusy;
+        int                     woke_up;
+        struct n_hdlc_buf       *tbuf;
+        struct n_hdlc_buf_list  tx_buf_list;
+        struct n_hdlc_buf_list  rx_buf_list;
+        struct n_hdlc_buf_list  tx_free_buf_list;
+        struct n_hdlc_buf_list  rx_free_buf_list;
+};
+
+/*
+ * HDLC buffer list manipulation functions
+ */
+static void n_hdlc_buf_list_init(struct n_hdlc_buf_list *list);
+static void n_hdlc_buf_put(struct n_hdlc_buf_list *list,
+                           struct n_hdlc_buf *buf);
+static struct n_hdlc_buf *n_hdlc_buf_get(struct n_hdlc_buf_list *list);
+
+/* Local functions */
+
+static struct n_hdlc *n_hdlc_alloc (void);
+
+/* debug level can be set by insmod for debugging purposes */
+#define DEBUG_LEVEL_INFO        1
+static int debuglevel;
+
+/* max frame size for memory allocations */
+static int maxframe = 4096;
+
+/* TTY callbacks */
+
+static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,
+                           __u8 __user *buf, size_t nr);
+static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,
+                            const unsigned char *buf, size_t nr);
+static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,
+                            unsigned int cmd, unsigned long arg);
+static unsigned int n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,
+                                    poll_table *wait);
+static int n_hdlc_tty_open(struct tty_struct *tty);
+static void n_hdlc_tty_close(struct tty_struct *tty);
+static void n_hdlc_tty_receive(struct tty_struct *tty, const __u8 *cp,
+                               char *fp, int count);
+static void n_hdlc_tty_wakeup(struct tty_struct *tty);
+
+#define bset(p,b)       ((p)[(b) >> 5] |= (1 << ((b) & 0x1f)))
+
+#define tty2n_hdlc(tty) ((struct n_hdlc *) ((tty)->disc_data))
+#define n_hdlc2tty(n_hdlc)      ((n_hdlc)->tty)
+
+static void flush_rx_queue(struct tty_struct *tty)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc(tty);
+        struct n_hdlc_buf *buf;
+
+        while ((buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list)))
+                n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, buf);
+}
+
+static void flush_tx_queue(struct tty_struct *tty)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc(tty);
+        struct n_hdlc_buf *buf;
+        unsigned long flags;
+
+        while ((buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list)))
+                n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, buf);
+        spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);
+        if (n_hdlc->tbuf) {
+                n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, n_hdlc->tbuf);
+                n_hdlc->tbuf = NULL;
+        }
+        spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);
+}
+
+static struct tty_ldisc_ops n_hdlc_ldisc = {
+        .owner          = THIS_MODULE,
+        .magic          = TTY_LDISC_MAGIC,
+        .name           = "hdlc",
+        .open           = n_hdlc_tty_open,
+        .close          = n_hdlc_tty_close,
+        .read           = n_hdlc_tty_read,
+        .write          = n_hdlc_tty_write,
+        .ioctl          = n_hdlc_tty_ioctl,
+        .poll           = n_hdlc_tty_poll,
+        .receive_buf    = n_hdlc_tty_receive,
+        .write_wakeup   = n_hdlc_tty_wakeup,
+        .flush_buffer   = flush_rx_queue,
+};
+
+/**
+ * n_hdlc_release - release an n_hdlc per device line discipline info structure
+ * @n_hdlc - per device line discipline info structure
+ */
+static void n_hdlc_release(struct n_hdlc *n_hdlc)
+{
+        struct tty_struct *tty = n_hdlc2tty (n_hdlc);
+        struct n_hdlc_buf *buf;
+        
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_release() called\n",__FILE__,__LINE__);
+                
+        /* Ensure that the n_hdlcd process is not hanging on select()/poll() */
+        wake_up_interruptible (&tty->read_wait);
+        wake_up_interruptible (&tty->write_wait);
+
+        if (tty->disc_data == n_hdlc)
+                tty->disc_data = NULL;  /* Break the tty->n_hdlc link */
+
+        /* Release transmit and receive buffers */
+        for(;;) {
+                buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);
+                if (buf) {
+                        kfree(buf);
+                } else
+                        break;
+        }
+        for(;;) {
+                buf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);
+                if (buf) {
+                        kfree(buf);
+                } else
+                        break;
+        }
+        for(;;) {
+                buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list);
+                if (buf) {
+                        kfree(buf);
+                } else
+                        break;
+        }
+        for(;;) {
+                buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);
+                if (buf) {
+                        kfree(buf);
+                } else
+                        break;
+        }
+        kfree(n_hdlc->tbuf);
+        kfree(n_hdlc);
+        
+}       /* end of n_hdlc_release() */
+
+/**
+ * n_hdlc_tty_close - line discipline close
+ * @tty - pointer to tty info structure
+ *
+ * Called when the line discipline is changed to something
+ * else, the tty is closed, or the tty detects a hangup.
+ */
+static void n_hdlc_tty_close(struct tty_struct *tty)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_close() called\n",__FILE__,__LINE__);
+                
+        if (n_hdlc != NULL) {
+                if (n_hdlc->magic != HDLC_MAGIC) {
+                        printk (KERN_WARNING"n_hdlc: trying to close unopened tty!\n");
+                        return;
+                }
+#if defined(TTY_NO_WRITE_SPLIT)
+                clear_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
+#endif
+                tty->disc_data = NULL;
+                if (tty == n_hdlc->backup_tty)
+                        n_hdlc->backup_tty = NULL;
+                if (tty != n_hdlc->tty)
+                        return;
+                if (n_hdlc->backup_tty) {
+                        n_hdlc->tty = n_hdlc->backup_tty;
+                } else {
+                        n_hdlc_release (n_hdlc);
+                }
+        }
+        
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_close() success\n",__FILE__,__LINE__);
+                
+}       /* end of n_hdlc_tty_close() */
+
+/**
+ * n_hdlc_tty_open - called when line discipline changed to n_hdlc
+ * @tty - pointer to tty info structure
+ *
+ * Returns 0 if success, otherwise error code
+ */
+static int n_hdlc_tty_open (struct tty_struct *tty)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_open() called (device=%s)\n",
+                __FILE__,__LINE__,
+                tty->name);
+                
+        /* There should not be an existing table for this slot. */
+        if (n_hdlc) {
+                printk (KERN_ERR"n_hdlc_tty_open:tty already associated!\n" );
+                return -EEXIST;
+        }
+        
+        n_hdlc = n_hdlc_alloc();
+        if (!n_hdlc) {
+                printk (KERN_ERR "n_hdlc_alloc failed\n");
+                return -ENFILE;
+        }
+                
+        tty->disc_data = n_hdlc;
+        n_hdlc->tty    = tty;
+        tty->receive_room = 65536;
+        
+#if defined(TTY_NO_WRITE_SPLIT)
+        /* change tty_io write() to not split large writes into 8K chunks */
+        set_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
+#endif
+        
+        /* flush receive data from driver */
+        tty_driver_flush_buffer(tty);
+                
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_open() success\n",__FILE__,__LINE__);
+                
+        return 0;
+        
+}       /* end of n_tty_hdlc_open() */
+
+/**
+ * n_hdlc_send_frames - send frames on pending send buffer list
+ * @n_hdlc - pointer to ldisc instance data
+ * @tty - pointer to tty instance data
+ *
+ * Send frames on pending send buffer list until the driver does not accept a
+ * frame (busy) this function is called after adding a frame to the send buffer
+ * list and by the tty wakeup callback.
+ */
+static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)
+{
+        register int actual;
+        unsigned long flags;
+        struct n_hdlc_buf *tbuf;
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_send_frames() called\n",__FILE__,__LINE__);
+ check_again:
+                
+        spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);
+        if (n_hdlc->tbusy) {
+                n_hdlc->woke_up = 1;
+                spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);
+                return;
+        }
+        n_hdlc->tbusy = 1;
+        n_hdlc->woke_up = 0;
+        spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);
+
+        /* get current transmit buffer or get new transmit */
+        /* buffer from list of pending transmit buffers */
+                
+        tbuf = n_hdlc->tbuf;
+        if (!tbuf)
+                tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);
+                
+        while (tbuf) {
+                if (debuglevel >= DEBUG_LEVEL_INFO)     
+                        printk("%s(%d)sending frame %p, count=%d\n",
+                                __FILE__,__LINE__,tbuf,tbuf->count);
+                        
+                /* Send the next block of data to device */
+                tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
+                actual = tty->ops->write(tty, tbuf->buf, tbuf->count);
+
+                /* rollback was possible and has been done */
+                if (actual == -ERESTARTSYS) {
+                        n_hdlc->tbuf = tbuf;
+                        break;
+                }
+                /* if transmit error, throw frame away by */
+                /* pretending it was accepted by driver */
+                if (actual < 0)
+                        actual = tbuf->count;
+                
+                if (actual == tbuf->count) {
+                        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                                printk("%s(%d)frame %p completed\n",
+                                        __FILE__,__LINE__,tbuf);
+                                        
+                        /* free current transmit buffer */
+                        n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, tbuf);
+                        
+                        /* this tx buffer is done */
+                        n_hdlc->tbuf = NULL;
+                        
+                        /* wait up sleeping writers */
+                        wake_up_interruptible(&tty->write_wait);
+        
+                        /* get next pending transmit buffer */
+                        tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);
+                } else {
+                        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                                printk("%s(%d)frame %p pending\n",
+                                        __FILE__,__LINE__,tbuf);
+                                        
+                        /* buffer not accepted by driver */
+                        /* set this buffer as pending buffer */
+                        n_hdlc->tbuf = tbuf;
+                        break;
+                }
+        }
+        
+        if (!tbuf)
+                tty->flags  &= ~(1 << TTY_DO_WRITE_WAKEUP);
+        
+        /* Clear the re-entry flag */
+        spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);
+        n_hdlc->tbusy = 0;
+        spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags); 
+        
+        if (n_hdlc->woke_up)
+          goto check_again;
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_send_frames() exit\n",__FILE__,__LINE__);
+                
+}       /* end of n_hdlc_send_frames() */
+
+/**
+ * n_hdlc_tty_wakeup - Callback for transmit wakeup
+ * @tty - pointer to associated tty instance data
+ *
+ * Called when low level device driver can accept more send data.
+ */
+static void n_hdlc_tty_wakeup(struct tty_struct *tty)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc(tty);
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_wakeup() called\n",__FILE__,__LINE__);
+                
+        if (!n_hdlc)
+                return;
+
+        if (tty != n_hdlc->tty) {
+                tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
+                return;
+        }
+
+        n_hdlc_send_frames (n_hdlc, tty);
+                
+}       /* end of n_hdlc_tty_wakeup() */
+
+/**
+ * n_hdlc_tty_receive - Called by tty driver when receive data is available
+ * @tty - pointer to tty instance data
+ * @data - pointer to received data
+ * @flags - pointer to flags for data
+ * @count - count of received data in bytes
+ *
+ * Called by tty low level driver when receive data is available. Data is
+ * interpreted as one HDLC frame.
+ */
+static void n_hdlc_tty_receive(struct tty_struct *tty, const __u8 *data,
+                               char *flags, int count)
+{
+        register struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
+        register struct n_hdlc_buf *buf;
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_receive() called count=%d\n",
+                        __FILE__,__LINE__, count);
+                
+        /* This can happen if stuff comes in on the backup tty */
+        if (!n_hdlc || tty != n_hdlc->tty)
+                return;
+                
+        /* verify line is using HDLC discipline */
+        if (n_hdlc->magic != HDLC_MAGIC) {
+                printk("%s(%d) line not using HDLC discipline\n",
+                        __FILE__,__LINE__);
+                return;
+        }
+        
+        if ( count>maxframe ) {
+                if (debuglevel >= DEBUG_LEVEL_INFO)     
+                        printk("%s(%d) rx count>maxframesize, data discarded\n",
+                               __FILE__,__LINE__);
+                return;
+        }
+
+        /* get a free HDLC buffer */    
+        buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);
+        if (!buf) {
+                /* no buffers in free list, attempt to allocate another rx buffer */
+                /* unless the maximum count has been reached */
+                if (n_hdlc->rx_buf_list.count < MAX_RX_BUF_COUNT)
+                        buf = kmalloc(N_HDLC_BUF_SIZE, GFP_ATOMIC);
+        }
+        
+        if (!buf) {
+                if (debuglevel >= DEBUG_LEVEL_INFO)     
+                        printk("%s(%d) no more rx buffers, data discarded\n",
+                               __FILE__,__LINE__);
+                return;
+        }
+                
+        /* copy received data to HDLC buffer */
+        memcpy(buf->buf,data,count);
+        buf->count=count;
+
+        /* add HDLC buffer to list of received frames */
+        n_hdlc_buf_put(&n_hdlc->rx_buf_list, buf);
+        
+        /* wake up any blocked reads and perform async signalling */
+        wake_up_interruptible (&tty->read_wait);
+        if (n_hdlc->tty->fasync != NULL)
+                kill_fasync (&n_hdlc->tty->fasync, SIGIO, POLL_IN);
+
+}       /* end of n_hdlc_tty_receive() */
+
+/**
+ * n_hdlc_tty_read - Called to retrieve one frame of data (if available)
+ * @tty - pointer to tty instance data
+ * @file - pointer to open file object
+ * @buf - pointer to returned data buffer
+ * @nr - size of returned data buffer
+ *      
+ * Returns the number of bytes returned or error code.
+ */
+static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,
+                           __u8 __user *buf, size_t nr)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc(tty);
+        int ret = 0;
+        struct n_hdlc_buf *rbuf;
+        DECLARE_WAITQUEUE(wait, current);
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_read() called\n",__FILE__,__LINE__);
+                
+        /* Validate the pointers */
+        if (!n_hdlc)
+                return -EIO;
+
+        /* verify user access to buffer */
+        if (!access_ok(VERIFY_WRITE, buf, nr)) {
+                printk(KERN_WARNING "%s(%d) n_hdlc_tty_read() can't verify user "
+                "buffer\n", __FILE__, __LINE__);
+                return -EFAULT;
+        }
+
+        add_wait_queue(&tty->read_wait, &wait);
+
+        for (;;) {
+                if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) {
+                        ret = -EIO;
+                        break;
+                }
+                if (tty_hung_up_p(file))
+                        break;
+
+                set_current_state(TASK_INTERRUPTIBLE);
+
+                rbuf = n_hdlc_buf_get(&n_hdlc->rx_buf_list);
+                if (rbuf) {
+                        if (rbuf->count > nr) {
+                                /* too large for caller's buffer */
+                                ret = -EOVERFLOW;
+                        } else {
+                                if (copy_to_user(buf, rbuf->buf, rbuf->count))
+                                        ret = -EFAULT;
+                                else
+                                        ret = rbuf->count;
+                        }
+
+                        if (n_hdlc->rx_free_buf_list.count >
+                            DEFAULT_RX_BUF_COUNT)
+                                kfree(rbuf);
+                        else
+                                n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, rbuf);
+                        break;
+                }
+                        
+                /* no data */
+                if (file->f_flags & O_NONBLOCK) {
+                        ret = -EAGAIN;
+                        break;
+                }
+
+                schedule();
+
+                if (signal_pending(current)) {
+                        ret = -EINTR;
+                        break;
+                }
+        }
+
+        remove_wait_queue(&tty->read_wait, &wait);
+        __set_current_state(TASK_RUNNING);
+
+        return ret;
+        
+}       /* end of n_hdlc_tty_read() */
+
+/**
+ * n_hdlc_tty_write - write a single frame of data to device
+ * @tty - pointer to associated tty device instance data
+ * @file - pointer to file object data
+ * @data - pointer to transmit data (one frame)
+ * @count - size of transmit frame in bytes
+ *              
+ * Returns the number of bytes written (or error code).
+ */
+static ssize_t n_hdlc_tty_write(struct tty_struct *tty, struct file *file,
+                            const unsigned char *data, size_t count)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
+        int error = 0;
+        DECLARE_WAITQUEUE(wait, current);
+        struct n_hdlc_buf *tbuf;
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_write() called count=%Zd\n",
+                        __FILE__,__LINE__,count);
+                
+        /* Verify pointers */
+        if (!n_hdlc)
+                return -EIO;
+
+        if (n_hdlc->magic != HDLC_MAGIC)
+                return -EIO;
+
+        /* verify frame size */
+        if (count > maxframe ) {
+                if (debuglevel & DEBUG_LEVEL_INFO)
+                        printk (KERN_WARNING
+                                "n_hdlc_tty_write: truncating user packet "
+                                "from %lu to %d\n", (unsigned long) count,
+                                maxframe );
+                count = maxframe;
+        }
+        
+        add_wait_queue(&tty->write_wait, &wait);
+
+        for (;;) {
+                set_current_state(TASK_INTERRUPTIBLE);
+        
+                tbuf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);
+                if (tbuf)
+                        break;
+
+                if (file->f_flags & O_NONBLOCK) {
+                        error = -EAGAIN;
+                        break;
+                }
+                schedule();
+                        
+                n_hdlc = tty2n_hdlc (tty);
+                if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC || 
+                    tty != n_hdlc->tty) {
+                        printk("n_hdlc_tty_write: %p invalid after wait!\n", n_hdlc);
+                        error = -EIO;
+                        break;
+                }
+                        
+                if (signal_pending(current)) {
+                        error = -EINTR;
+                        break;
+                }
+        }
+
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(&tty->write_wait, &wait);
+
+        if (!error) {           
+                /* Retrieve the user's buffer */
+                memcpy(tbuf->buf, data, count);
+
+                /* Send the data */
+                tbuf->count = error = count;
+                n_hdlc_buf_put(&n_hdlc->tx_buf_list,tbuf);
+                n_hdlc_send_frames(n_hdlc,tty);
+        }
+
+        return error;
+        
+}       /* end of n_hdlc_tty_write() */
+
+/**
+ * n_hdlc_tty_ioctl - process IOCTL system call for the tty device.
+ * @tty - pointer to tty instance data
+ * @file - pointer to open file object for device
+ * @cmd - IOCTL command code
+ * @arg - argument for IOCTL call (cmd dependent)
+ *
+ * Returns command dependent result.
+ */
+static int n_hdlc_tty_ioctl(struct tty_struct *tty, struct file *file,
+                            unsigned int cmd, unsigned long arg)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
+        int error = 0;
+        int count;
+        unsigned long flags;
+        
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_ioctl() called %d\n",
+                        __FILE__,__LINE__,cmd);
+                
+        /* Verify the status of the device */
+        if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC)
+                return -EBADF;
+
+        switch (cmd) {
+        case FIONREAD:
+                /* report count of read data available */
+                /* in next available frame (if any) */
+                spin_lock_irqsave(&n_hdlc->rx_buf_list.spinlock,flags);
+                if (n_hdlc->rx_buf_list.head)
+                        count = n_hdlc->rx_buf_list.head->count;
+                else
+                        count = 0;
+                spin_unlock_irqrestore(&n_hdlc->rx_buf_list.spinlock,flags);
+                error = put_user(count, (int __user *)arg);
+                break;
+
+        case TIOCOUTQ:
+                /* get the pending tx byte count in the driver */
+                count = tty_chars_in_buffer(tty);
+                /* add size of next output frame in queue */
+                spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock,flags);
+                if (n_hdlc->tx_buf_list.head)
+                        count += n_hdlc->tx_buf_list.head->count;
+                spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock,flags);
+                error = put_user(count, (int __user *)arg);
+                break;
+
+        case TCFLSH:
+                switch (arg) {
+                case TCIOFLUSH:
+                case TCOFLUSH:
+                        flush_tx_queue(tty);
+                }
+                /* fall through to default */
+
+        default:
+                error = n_tty_ioctl_helper(tty, file, cmd, arg);
+                break;
+        }
+        return error;
+        
+}       /* end of n_hdlc_tty_ioctl() */
+
+/**
+ * n_hdlc_tty_poll - TTY callback for poll system call
+ * @tty - pointer to tty instance data
+ * @filp - pointer to open file object for device
+ * @poll_table - wait queue for operations
+ * 
+ * Determine which operations (read/write) will not block and return info
+ * to caller.
+ * Returns a bit mask containing info on which ops will not block.
+ */
+static unsigned int n_hdlc_tty_poll(struct tty_struct *tty, struct file *filp,
+                                    poll_table *wait)
+{
+        struct n_hdlc *n_hdlc = tty2n_hdlc (tty);
+        unsigned int mask = 0;
+
+        if (debuglevel >= DEBUG_LEVEL_INFO)     
+                printk("%s(%d)n_hdlc_tty_poll() called\n",__FILE__,__LINE__);
+                
+        if (n_hdlc && n_hdlc->magic == HDLC_MAGIC && tty == n_hdlc->tty) {
+                /* queue current process into any wait queue that */
+                /* may awaken in the future (read and write) */
+
+                poll_wait(filp, &tty->read_wait, wait);
+                poll_wait(filp, &tty->write_wait, wait);
+
+                /* set bits for operations that won't block */
+                if (n_hdlc->rx_buf_list.head)
+                        mask |= POLLIN | POLLRDNORM;    /* readable */
+                if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
+                        mask |= POLLHUP;
+                if (tty_hung_up_p(filp))
+                        mask |= POLLHUP;
+                if (!tty_is_writelocked(tty) &&
+                                n_hdlc->tx_free_buf_list.head)
+                        mask |= POLLOUT | POLLWRNORM;   /* writable */
+        }
+        return mask;
+}       /* end of n_hdlc_tty_poll() */
+
+/**
+ * n_hdlc_alloc - allocate an n_hdlc instance data structure
+ *
+ * Returns a pointer to newly created structure if success, otherwise %NULL
+ */
+static struct n_hdlc *n_hdlc_alloc(void)
+{
+        struct n_hdlc_buf *buf;
+        int i;
+        struct n_hdlc *n_hdlc = kmalloc(sizeof(*n_hdlc), GFP_KERNEL);
+
+        if (!n_hdlc)
+                return NULL;
+
+        memset(n_hdlc, 0, sizeof(*n_hdlc));
+
+        n_hdlc_buf_list_init(&n_hdlc->rx_free_buf_list);
+        n_hdlc_buf_list_init(&n_hdlc->tx_free_buf_list);
+        n_hdlc_buf_list_init(&n_hdlc->rx_buf_list);
+        n_hdlc_buf_list_init(&n_hdlc->tx_buf_list);
+        
+        /* allocate free rx buffer list */
+        for(i=0;i<DEFAULT_RX_BUF_COUNT;i++) {
+                buf = kmalloc(N_HDLC_BUF_SIZE, GFP_KERNEL);
+                if (buf)
+                        n_hdlc_buf_put(&n_hdlc->rx_free_buf_list,buf);
+                else if (debuglevel >= DEBUG_LEVEL_INFO)        
+                        printk("%s(%d)n_hdlc_alloc(), kalloc() failed for rx buffer %d\n",__FILE__,__LINE__, i);
+        }
+        
+        /* allocate free tx buffer list */
+        for(i=0;i<DEFAULT_TX_BUF_COUNT;i++) {
+                buf = kmalloc(N_HDLC_BUF_SIZE, GFP_KERNEL);
+                if (buf)
+                        n_hdlc_buf_put(&n_hdlc->tx_free_buf_list,buf);
+                else if (debuglevel >= DEBUG_LEVEL_INFO)        
+                        printk("%s(%d)n_hdlc_alloc(), kalloc() failed for tx buffer %d\n",__FILE__,__LINE__, i);
+        }
+        
+        /* Initialize the control block */
+        n_hdlc->magic  = HDLC_MAGIC;
+        n_hdlc->flags  = 0;
+        
+        return n_hdlc;
+        
+}       /* end of n_hdlc_alloc() */
+
+/**
+ * n_hdlc_buf_list_init - initialize specified HDLC buffer list
+ * @list - pointer to buffer list
+ */
+static void n_hdlc_buf_list_init(struct n_hdlc_buf_list *list)
+{
+        memset(list, 0, sizeof(*list));
+        spin_lock_init(&list->spinlock);
+}       /* end of n_hdlc_buf_list_init() */
+
+/**
+ * n_hdlc_buf_put - add specified HDLC buffer to tail of specified list
+ * @list - pointer to buffer list
+ * @buf - pointer to buffer
+ */
+static void n_hdlc_buf_put(struct n_hdlc_buf_list *list,
+                           struct n_hdlc_buf *buf)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&list->spinlock,flags);
+        
+        buf->link=NULL;
+        if (list->tail)
+                list->tail->link = buf;
+        else
+                list->head = buf;
+        list->tail = buf;
+        (list->count)++;
+        
+        spin_unlock_irqrestore(&list->spinlock,flags);
+        
+}       /* end of n_hdlc_buf_put() */
+
+/**
+ * n_hdlc_buf_get - remove and return an HDLC buffer from list
+ * @list - pointer to HDLC buffer list
+ * 
+ * Remove and return an HDLC buffer from the head of the specified HDLC buffer
+ * list.
+ * Returns a pointer to HDLC buffer if available, otherwise %NULL.
+ */
+static struct n_hdlc_buf* n_hdlc_buf_get(struct n_hdlc_buf_list *list)
+{
+        unsigned long flags;
+        struct n_hdlc_buf *buf;
+        spin_lock_irqsave(&list->spinlock,flags);
+        
+        buf = list->head;
+        if (buf) {
+                list->head = buf->link;
+                (list->count)--;
+        }
+        if (!list->head)
+                list->tail = NULL;
+        
+        spin_unlock_irqrestore(&list->spinlock,flags);
+        return buf;
+        
+}       /* end of n_hdlc_buf_get() */
+
+static char hdlc_banner[] __initdata =
+        KERN_INFO "HDLC line discipline maxframe=%u\n";
+static char hdlc_register_ok[] __initdata =
+        KERN_INFO "N_HDLC line discipline registered.\n";
+static char hdlc_register_fail[] __initdata =
+        KERN_ERR "error registering line discipline: %d\n";
+static char hdlc_init_fail[] __initdata =
+        KERN_INFO "N_HDLC: init failure %d\n";
+
+static int __init n_hdlc_init(void)
+{
+        int status;
+
+        /* range check maxframe arg */
+        if (maxframe < 4096)
+                maxframe = 4096;
+        else if (maxframe > 65535)
+                maxframe = 65535;
+
+        printk(hdlc_banner, maxframe);
+
+        status = tty_register_ldisc(N_HDLC, &n_hdlc_ldisc);
+        if (!status)
+                printk(hdlc_register_ok);
+        else
+                printk(hdlc_register_fail, status);
+
+        if (status)
+                printk(hdlc_init_fail, status);
+        return status;
+        
+}       /* end of init_module() */
+
+static char hdlc_unregister_ok[] __exitdata =
+        KERN_INFO "N_HDLC: line discipline unregistered\n";
+static char hdlc_unregister_fail[] __exitdata =
+        KERN_ERR "N_HDLC: can't unregister line discipline (err = %d)\n";
+
+static void __exit n_hdlc_exit(void)
+{
+        /* Release tty registration of line discipline */
+        int status = tty_unregister_ldisc(N_HDLC);
+
+        if (status)
+                printk(hdlc_unregister_fail, status);
+        else
+                printk(hdlc_unregister_ok);
+}
+
+module_init(n_hdlc_init);
+module_exit(n_hdlc_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Paul Fulghum paulkf@microgate.com");
+module_param(debuglevel, int, 0);
+module_param(maxframe, int, 0);
+MODULE_ALIAS_LDISC(N_HDLC);
diff --git a/drivers/tty/n_r3964.c b/drivers/tty/n_r3964.c
new file mode 100644
index 000000000000..5c6c31459a2f
--- /dev/null
+++ b/drivers/tty/n_r3964.c
@@ -0,0 +1,1263 @@
+/* r3964 linediscipline for linux
+ *
+ * -----------------------------------------------------------
+ * Copyright by 
+ * Philips Automation Projects
+ * Kassel (Germany)
+ * -----------------------------------------------------------
+ * This software may be used and distributed according to the terms of
+ * the GNU General Public License, incorporated herein by reference.
+ *
+ * Author:
+ * L. Haag
+ *
+ * $Log: n_r3964.c,v $
+ * Revision 1.10  2001/03/18 13:02:24  dwmw2
+ * Fix timer usage, use spinlocks properly.
+ *
+ * Revision 1.9  2001/03/18 12:52:14  dwmw2
+ * Merge changes in 2.4.2
+ *
+ * Revision 1.8  2000/03/23 14:14:54  dwmw2
+ * Fix race in sleeping in r3964_read()
+ *
+ * Revision 1.7  1999/28/08 11:41:50  dwmw2
+ * Port to 2.3 kernel
+ *
+ * Revision 1.6  1998/09/30 00:40:40  dwmw2
+ * Fixed compilation on 2.0.x kernels
+ * Updated to newly registered tty-ldisc number 9
+ *
+ * Revision 1.5  1998/09/04 21:57:36  dwmw2
+ * Signal handling bug fixes, port to 2.1.x.
+ *
+ * Revision 1.4  1998/04/02 20:26:59  lhaag
+ * select, blocking, ...
+ *
+ * Revision 1.3  1998/02/12 18:58:43  root
+ * fixed some memory leaks
+ * calculation of checksum characters
+ *
+ * Revision 1.2  1998/02/07 13:03:34  root
+ * ioctl read_telegram
+ *
+ * Revision 1.1  1998/02/06 19:21:03  root
+ * Initial revision
+ *
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>       /* used in new tty drivers */
+#include <linux/signal.h>       /* used in new tty drivers */
+#include <linux/ioctl.h>
+#include <linux/n_r3964.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+
+/*#define DEBUG_QUEUE*/
+
+/* Log successful handshake and protocol operations  */
+/*#define DEBUG_PROTO_S*/
+
+/* Log handshake and protocol errors: */
+/*#define DEBUG_PROTO_E*/
+
+/* Log Linediscipline operations (open, close, read, write...): */
+/*#define DEBUG_LDISC*/
+
+/* Log module and memory operations (init, cleanup; kmalloc, kfree): */
+/*#define DEBUG_MODUL*/
+
+/* Macro helpers for debug output: */
+#define TRACE(format, args...) printk("r3964: " format "\n" , ## args)
+
+#ifdef DEBUG_MODUL
+#define TRACE_M(format, args...) printk("r3964: " format "\n" , ## args)
+#else
+#define TRACE_M(fmt, arg...) do {} while (0)
+#endif
+#ifdef DEBUG_PROTO_S
+#define TRACE_PS(format, args...) printk("r3964: " format "\n" , ## args)
+#else
+#define TRACE_PS(fmt, arg...) do {} while (0)
+#endif
+#ifdef DEBUG_PROTO_E
+#define TRACE_PE(format, args...) printk("r3964: " format "\n" , ## args)
+#else
+#define TRACE_PE(fmt, arg...) do {} while (0)
+#endif
+#ifdef DEBUG_LDISC
+#define TRACE_L(format, args...) printk("r3964: " format "\n" , ## args)
+#else
+#define TRACE_L(fmt, arg...) do {} while (0)
+#endif
+#ifdef DEBUG_QUEUE
+#define TRACE_Q(format, args...) printk("r3964: " format "\n" , ## args)
+#else
+#define TRACE_Q(fmt, arg...) do {} while (0)
+#endif
+static void add_tx_queue(struct r3964_info *, struct r3964_block_header *);
+static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code);
+static void put_char(struct r3964_info *pInfo, unsigned char ch);
+static void trigger_transmit(struct r3964_info *pInfo);
+static void retry_transmit(struct r3964_info *pInfo);
+static void transmit_block(struct r3964_info *pInfo);
+static void receive_char(struct r3964_info *pInfo, const unsigned char c);
+static void receive_error(struct r3964_info *pInfo, const char flag);
+static void on_timeout(unsigned long priv);
+static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg);
+static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
+                unsigned char __user * buf);
+static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg,
+                int error_code, struct r3964_block_header *pBlock);
+static struct r3964_message *remove_msg(struct r3964_info *pInfo,
+                struct r3964_client_info *pClient);
+static void remove_client_block(struct r3964_info *pInfo,
+                struct r3964_client_info *pClient);
+
+static int r3964_open(struct tty_struct *tty);
+static void r3964_close(struct tty_struct *tty);
+static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
+                unsigned char __user * buf, size_t nr);
+static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
+                const unsigned char *buf, size_t nr);
+static int r3964_ioctl(struct tty_struct *tty, struct file *file,
+                unsigned int cmd, unsigned long arg);
+static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old);
+static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
+                struct poll_table_struct *wait);
+static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+                char *fp, int count);
+
+static struct tty_ldisc_ops tty_ldisc_N_R3964 = {
+        .owner = THIS_MODULE,
+        .magic = TTY_LDISC_MAGIC,
+        .name = "R3964",
+        .open = r3964_open,
+        .close = r3964_close,
+        .read = r3964_read,
+        .write = r3964_write,
+        .ioctl = r3964_ioctl,
+        .set_termios = r3964_set_termios,
+        .poll = r3964_poll,
+        .receive_buf = r3964_receive_buf,
+};
+
+static void dump_block(const unsigned char *block, unsigned int length)
+{
+        unsigned int i, j;
+        char linebuf[16 * 3 + 1];
+
+        for (i = 0; i < length; i += 16) {
+                for (j = 0; (j < 16) && (j + i < length); j++) {
+                        sprintf(linebuf + 3 * j, "%02x ", block[i + j]);
+                }
+                linebuf[3 * j] = '\0';
+                TRACE_PS("%s", linebuf);
+        }
+}
+
+/*************************************************************
+ * Driver initialisation
+ *************************************************************/
+
+/*************************************************************
+ * Module support routines
+ *************************************************************/
+
+static void __exit r3964_exit(void)
+{
+        int status;
+
+        TRACE_M("cleanup_module()");
+
+        status = tty_unregister_ldisc(N_R3964);
+
+        if (status != 0) {
+                printk(KERN_ERR "r3964: error unregistering linediscipline: "
+                                "%d\n", status);
+        } else {
+                TRACE_L("linediscipline successfully unregistered");
+        }
+}
+
+static int __init r3964_init(void)
+{
+        int status;
+
+        printk("r3964: Philips r3964 Driver $Revision: 1.10 $\n");
+
+        /*
+         * Register the tty line discipline
+         */
+
+        status = tty_register_ldisc(N_R3964, &tty_ldisc_N_R3964);
+        if (status == 0) {
+                TRACE_L("line discipline %d registered", N_R3964);
+                TRACE_L("flags=%x num=%x", tty_ldisc_N_R3964.flags,
+                        tty_ldisc_N_R3964.num);
+                TRACE_L("open=%p", tty_ldisc_N_R3964.open);
+                TRACE_L("tty_ldisc_N_R3964 = %p", &tty_ldisc_N_R3964);
+        } else {
+                printk(KERN_ERR "r3964: error registering line discipline: "
+                                "%d\n", status);
+        }
+        return status;
+}
+
+module_init(r3964_init);
+module_exit(r3964_exit);
+
+/*************************************************************
+ * Protocol implementation routines
+ *************************************************************/
+
+static void add_tx_queue(struct r3964_info *pInfo,
+                         struct r3964_block_header *pHeader)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&pInfo->lock, flags);
+
+        pHeader->next = NULL;
+
+        if (pInfo->tx_last == NULL) {
+                pInfo->tx_first = pInfo->tx_last = pHeader;
+        } else {
+                pInfo->tx_last->next = pHeader;
+                pInfo->tx_last = pHeader;
+        }
+
+        spin_unlock_irqrestore(&pInfo->lock, flags);
+
+        TRACE_Q("add_tx_queue %p, length %d, tx_first = %p",
+                pHeader, pHeader->length, pInfo->tx_first);
+}
+
+static void remove_from_tx_queue(struct r3964_info *pInfo, int error_code)
+{
+        struct r3964_block_header *pHeader;
+        unsigned long flags;
+#ifdef DEBUG_QUEUE
+        struct r3964_block_header *pDump;
+#endif
+
+        pHeader = pInfo->tx_first;
+
+        if (pHeader == NULL)
+                return;
+
+#ifdef DEBUG_QUEUE
+        printk("r3964: remove_from_tx_queue: %p, length %u - ",
+                pHeader, pHeader->length);
+        for (pDump = pHeader; pDump; pDump = pDump->next)
+                printk("%p ", pDump);
+        printk("\n");
+#endif
+
+        if (pHeader->owner) {
+                if (error_code) {
+                        add_msg(pHeader->owner, R3964_MSG_ACK, 0,
+                                error_code, NULL);
+                } else {
+                        add_msg(pHeader->owner, R3964_MSG_ACK, pHeader->length,
+                                error_code, NULL);
+                }
+                wake_up_interruptible(&pInfo->read_wait);
+        }
+
+        spin_lock_irqsave(&pInfo->lock, flags);
+
+        pInfo->tx_first = pHeader->next;
+        if (pInfo->tx_first == NULL) {
+                pInfo->tx_last = NULL;
+        }
+
+        spin_unlock_irqrestore(&pInfo->lock, flags);
+
+        kfree(pHeader);
+        TRACE_M("remove_from_tx_queue - kfree %p", pHeader);
+
+        TRACE_Q("remove_from_tx_queue: tx_first = %p, tx_last = %p",
+                pInfo->tx_first, pInfo->tx_last);
+}
+
+static void add_rx_queue(struct r3964_info *pInfo,
+                         struct r3964_block_header *pHeader)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&pInfo->lock, flags);
+
+        pHeader->next = NULL;
+
+        if (pInfo->rx_last == NULL) {
+                pInfo->rx_first = pInfo->rx_last = pHeader;
+        } else {
+                pInfo->rx_last->next = pHeader;
+                pInfo->rx_last = pHeader;
+        }
+        pInfo->blocks_in_rx_queue++;
+
+        spin_unlock_irqrestore(&pInfo->lock, flags);
+
+        TRACE_Q("add_rx_queue: %p, length = %d, rx_first = %p, count = %d",
+                pHeader, pHeader->length,
+                pInfo->rx_first, pInfo->blocks_in_rx_queue);
+}
+
+static void remove_from_rx_queue(struct r3964_info *pInfo,
+                                 struct r3964_block_header *pHeader)
+{
+        unsigned long flags;
+        struct r3964_block_header *pFind;
+
+        if (pHeader == NULL)
+                return;
+
+        TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
+                pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue);
+        TRACE_Q("remove_from_rx_queue: %p, length %u",
+                pHeader, pHeader->length);
+
+        spin_lock_irqsave(&pInfo->lock, flags);
+
+        if (pInfo->rx_first == pHeader) {
+                /* Remove the first block in the linked list: */
+                pInfo->rx_first = pHeader->next;
+
+                if (pInfo->rx_first == NULL) {
+                        pInfo->rx_last = NULL;
+                }
+                pInfo->blocks_in_rx_queue--;
+        } else {
+                /* Find block to remove: */
+                for (pFind = pInfo->rx_first; pFind; pFind = pFind->next) {
+                        if (pFind->next == pHeader) {
+                                /* Got it. */
+                                pFind->next = pHeader->next;
+                                pInfo->blocks_in_rx_queue--;
+                                if (pFind->next == NULL) {
+                                        /* Oh, removed the last one! */
+                                        pInfo->rx_last = pFind;
+                                }
+                                break;
+                        }
+                }
+        }
+
+        spin_unlock_irqrestore(&pInfo->lock, flags);
+
+        kfree(pHeader);
+        TRACE_M("remove_from_rx_queue - kfree %p", pHeader);
+
+        TRACE_Q("remove_from_rx_queue: rx_first = %p, rx_last = %p, count = %d",
+                pInfo->rx_first, pInfo->rx_last, pInfo->blocks_in_rx_queue);
+}
+
+static void put_char(struct r3964_info *pInfo, unsigned char ch)
+{
+        struct tty_struct *tty = pInfo->tty;
+        /* FIXME: put_char should not be called from an IRQ */
+        tty_put_char(tty, ch);
+        pInfo->bcc ^= ch;
+}
+
+static void flush(struct r3964_info *pInfo)
+{
+        struct tty_struct *tty = pInfo->tty;
+
+        if (tty == NULL || tty->ops->flush_chars == NULL)
+                return;
+        tty->ops->flush_chars(tty);
+}
+
+static void trigger_transmit(struct r3964_info *pInfo)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&pInfo->lock, flags);
+
+        if ((pInfo->state == R3964_IDLE) && (pInfo->tx_first != NULL)) {
+                pInfo->state = R3964_TX_REQUEST;
+                pInfo->nRetry = 0;
+                pInfo->flags &= ~R3964_ERROR;
+                mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
+
+                spin_unlock_irqrestore(&pInfo->lock, flags);
+
+                TRACE_PS("trigger_transmit - sent STX");
+
+                put_char(pInfo, STX);
+                flush(pInfo);
+
+                pInfo->bcc = 0;
+        } else {
+                spin_unlock_irqrestore(&pInfo->lock, flags);
+        }
+}
+
+static void retry_transmit(struct r3964_info *pInfo)
+{
+        if (pInfo->nRetry < R3964_MAX_RETRIES) {
+                TRACE_PE("transmission failed. Retry #%d", pInfo->nRetry);
+                pInfo->bcc = 0;
+                put_char(pInfo, STX);
+                flush(pInfo);
+                pInfo->state = R3964_TX_REQUEST;
+                pInfo->nRetry++;
+                mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
+        } else {
+                TRACE_PE("transmission failed after %d retries",
+                         R3964_MAX_RETRIES);
+
+                remove_from_tx_queue(pInfo, R3964_TX_FAIL);
+
+                put_char(pInfo, NAK);
+                flush(pInfo);
+                pInfo->state = R3964_IDLE;
+
+                trigger_transmit(pInfo);
+        }
+}
+
+static void transmit_block(struct r3964_info *pInfo)
+{
+        struct tty_struct *tty = pInfo->tty;
+        struct r3964_block_header *pBlock = pInfo->tx_first;
+        int room = 0;
+
+        if (tty == NULL || pBlock == NULL) {
+                return;
+        }
+
+        room = tty_write_room(tty);
+
+        TRACE_PS("transmit_block %p, room %d, length %d",
+                 pBlock, room, pBlock->length);
+
+        while (pInfo->tx_position < pBlock->length) {
+                if (room < 2)
+                        break;
+
+                if (pBlock->data[pInfo->tx_position] == DLE) {
+                        /* send additional DLE char: */
+                        put_char(pInfo, DLE);
+                }
+                put_char(pInfo, pBlock->data[pInfo->tx_position++]);
+
+                room--;
+        }
+
+        if ((pInfo->tx_position == pBlock->length) && (room >= 3)) {
+                put_char(pInfo, DLE);
+                put_char(pInfo, ETX);
+                if (pInfo->flags & R3964_BCC) {
+                        put_char(pInfo, pInfo->bcc);
+                }
+                pInfo->state = R3964_WAIT_FOR_TX_ACK;
+                mod_timer(&pInfo->tmr, jiffies + R3964_TO_QVZ);
+        }
+        flush(pInfo);
+}
+
+static void on_receive_block(struct r3964_info *pInfo)
+{
+        unsigned int length;
+        struct r3964_client_info *pClient;
+        struct r3964_block_header *pBlock;
+
+        length = pInfo->rx_position;
+
+        /* compare byte checksum characters: */
+        if (pInfo->flags & R3964_BCC) {
+                if (pInfo->bcc != pInfo->last_rx) {
+                        TRACE_PE("checksum error - got %x but expected %x",
+                                 pInfo->last_rx, pInfo->bcc);
+                        pInfo->flags |= R3964_CHECKSUM;
+                }
+        }
+
+        /* check for errors (parity, overrun,...): */
+        if (pInfo->flags & R3964_ERROR) {
+                TRACE_PE("on_receive_block - transmission failed error %x",
+                         pInfo->flags & R3964_ERROR);
+
+                put_char(pInfo, NAK);
+                flush(pInfo);
+                if (pInfo->nRetry < R3964_MAX_RETRIES) {
+                        pInfo->state = R3964_WAIT_FOR_RX_REPEAT;
+                        pInfo->nRetry++;
+                        mod_timer(&pInfo->tmr, jiffies + R3964_TO_RX_PANIC);
+                } else {
+                        TRACE_PE("on_receive_block - failed after max retries");
+                        pInfo->state = R3964_IDLE;
+                }
+                return;
+        }
+
+        /* received block; submit DLE: */
+        put_char(pInfo, DLE);
+        flush(pInfo);
+        del_timer_sync(&pInfo->tmr);
+        TRACE_PS(" rx success: got %d chars", length);
+
+        /* prepare struct r3964_block_header: */
+        pBlock = kmalloc(length + sizeof(struct r3964_block_header),
+                        GFP_KERNEL);
+        TRACE_M("on_receive_block - kmalloc %p", pBlock);
+
+        if (pBlock == NULL)
+                return;
+
+        pBlock->length = length;
+        pBlock->data = ((unsigned char *)pBlock) +
+                        sizeof(struct r3964_block_header);
+        pBlock->locks = 0;
+        pBlock->next = NULL;
+        pBlock->owner = NULL;
+
+        memcpy(pBlock->data, pInfo->rx_buf, length);
+
+        /* queue block into rx_queue: */
+        add_rx_queue(pInfo, pBlock);
+
+        /* notify attached client processes: */
+        for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) {
+                if (pClient->sig_flags & R3964_SIG_DATA) {
+                        add_msg(pClient, R3964_MSG_DATA, length, R3964_OK,
+                                pBlock);
+                }
+        }
+        wake_up_interruptible(&pInfo->read_wait);
+
+        pInfo->state = R3964_IDLE;
+
+        trigger_transmit(pInfo);
+}
+
+static void receive_char(struct r3964_info *pInfo, const unsigned char c)
+{
+        switch (pInfo->state) {
+        case R3964_TX_REQUEST:
+                if (c == DLE) {
+                        TRACE_PS("TX_REQUEST - got DLE");
+
+                        pInfo->state = R3964_TRANSMITTING;
+                        pInfo->tx_position = 0;
+
+                        transmit_block(pInfo);
+                } else if (c == STX) {
+                        if (pInfo->nRetry == 0) {
+                                TRACE_PE("TX_REQUEST - init conflict");
+                                if (pInfo->priority == R3964_SLAVE) {
+                                        goto start_receiving;
+                                }
+                        } else {
+                                TRACE_PE("TX_REQUEST - secondary init "
+                                        "conflict!? Switching to SLAVE mode "
+                                        "for next rx.");
+                                goto start_receiving;
+                        }
+                } else {
+                        TRACE_PE("TX_REQUEST - char != DLE: %x", c);
+                        retry_transmit(pInfo);
+                }
+                break;
+        case R3964_TRANSMITTING:
+                if (c == NAK) {
+                        TRACE_PE("TRANSMITTING - got NAK");
+                        retry_transmit(pInfo);
+                } else {
+                        TRACE_PE("TRANSMITTING - got invalid char");
+
+                        pInfo->state = R3964_WAIT_ZVZ_BEFORE_TX_RETRY;
+                        mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
+                }
+                break;
+        case R3964_WAIT_FOR_TX_ACK:
+                if (c == DLE) {
+                        TRACE_PS("WAIT_FOR_TX_ACK - got DLE");
+                        remove_from_tx_queue(pInfo, R3964_OK);
+
+                        pInfo->state = R3964_IDLE;
+                        trigger_transmit(pInfo);
+                } else {
+                        retry_transmit(pInfo);
+                }
+                break;
+        case R3964_WAIT_FOR_RX_REPEAT:
+                /* FALLTHROUGH */
+        case R3964_IDLE:
+                if (c == STX) {
+                        /* Prevent rx_queue from overflow: */
+                        if (pInfo->blocks_in_rx_queue >=
+                            R3964_MAX_BLOCKS_IN_RX_QUEUE) {
+                                TRACE_PE("IDLE - got STX but no space in "
+                                                "rx_queue!");
+                                pInfo->state = R3964_WAIT_FOR_RX_BUF;
+                                mod_timer(&pInfo->tmr,
+                                          jiffies + R3964_TO_NO_BUF);
+                                break;
+                        }
+start_receiving:
+                        /* Ok, start receiving: */
+                        TRACE_PS("IDLE - got STX");
+                        pInfo->rx_position = 0;
+                        pInfo->last_rx = 0;
+                        pInfo->flags &= ~R3964_ERROR;
+                        pInfo->state = R3964_RECEIVING;
+                        mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
+                        pInfo->nRetry = 0;
+                        put_char(pInfo, DLE);
+                        flush(pInfo);
+                        pInfo->bcc = 0;
+                }
+                break;
+        case R3964_RECEIVING:
+                if (pInfo->rx_position < RX_BUF_SIZE) {
+                        pInfo->bcc ^= c;
+
+                        if (c == DLE) {
+                                if (pInfo->last_rx == DLE) {
+                                        pInfo->last_rx = 0;
+                                        goto char_to_buf;
+                                }
+                                pInfo->last_rx = DLE;
+                                break;
+                        } else if ((c == ETX) && (pInfo->last_rx == DLE)) {
+                                if (pInfo->flags & R3964_BCC) {
+                                        pInfo->state = R3964_WAIT_FOR_BCC;
+                                        mod_timer(&pInfo->tmr,
+                                                  jiffies + R3964_TO_ZVZ);
+                                } else {
+                                        on_receive_block(pInfo);
+                                }
+                        } else {
+                                pInfo->last_rx = c;
+char_to_buf:
+                                pInfo->rx_buf[pInfo->rx_position++] = c;
+                                mod_timer(&pInfo->tmr, jiffies + R3964_TO_ZVZ);
+                        }
+                }
+                /* else: overflow-msg? BUF_SIZE>MTU; should not happen? */
+                break;
+        case R3964_WAIT_FOR_BCC:
+                pInfo->last_rx = c;
+                on_receive_block(pInfo);
+                break;
+        }
+}
+
+static void receive_error(struct r3964_info *pInfo, const char flag)
+{
+        switch (flag) {
+        case TTY_NORMAL:
+                break;
+        case TTY_BREAK:
+                TRACE_PE("received break");
+                pInfo->flags |= R3964_BREAK;
+                break;
+        case TTY_PARITY:
+                TRACE_PE("parity error");
+                pInfo->flags |= R3964_PARITY;
+                break;
+        case TTY_FRAME:
+                TRACE_PE("frame error");
+                pInfo->flags |= R3964_FRAME;
+                break;
+        case TTY_OVERRUN:
+                TRACE_PE("frame overrun");
+                pInfo->flags |= R3964_OVERRUN;
+                break;
+        default:
+                TRACE_PE("receive_error - unknown flag %d", flag);
+                pInfo->flags |= R3964_UNKNOWN;
+                break;
+        }
+}
+
+static void on_timeout(unsigned long priv)
+{
+        struct r3964_info *pInfo = (void *)priv;
+
+        switch (pInfo->state) {
+        case R3964_TX_REQUEST:
+                TRACE_PE("TX_REQUEST - timeout");
+                retry_transmit(pInfo);
+                break;
+        case R3964_WAIT_ZVZ_BEFORE_TX_RETRY:
+                put_char(pInfo, NAK);
+                flush(pInfo);
+                retry_transmit(pInfo);
+                break;
+        case R3964_WAIT_FOR_TX_ACK:
+                TRACE_PE("WAIT_FOR_TX_ACK - timeout");
+                retry_transmit(pInfo);
+                break;
+        case R3964_WAIT_FOR_RX_BUF:
+                TRACE_PE("WAIT_FOR_RX_BUF - timeout");
+                put_char(pInfo, NAK);
+                flush(pInfo);
+                pInfo->state = R3964_IDLE;
+                break;
+        case R3964_RECEIVING:
+                TRACE_PE("RECEIVING - timeout after %d chars",
+                         pInfo->rx_position);
+                put_char(pInfo, NAK);
+                flush(pInfo);
+                pInfo->state = R3964_IDLE;
+                break;
+        case R3964_WAIT_FOR_RX_REPEAT:
+                TRACE_PE("WAIT_FOR_RX_REPEAT - timeout");
+                pInfo->state = R3964_IDLE;
+                break;
+        case R3964_WAIT_FOR_BCC:
+                TRACE_PE("WAIT_FOR_BCC - timeout");
+                put_char(pInfo, NAK);
+                flush(pInfo);
+                pInfo->state = R3964_IDLE;
+                break;
+        }
+}
+
+static struct r3964_client_info *findClient(struct r3964_info *pInfo,
+                struct pid *pid)
+{
+        struct r3964_client_info *pClient;
+
+        for (pClient = pInfo->firstClient; pClient; pClient = pClient->next) {
+                if (pClient->pid == pid) {
+                        return pClient;
+                }
+        }
+        return NULL;
+}
+
+static int enable_signals(struct r3964_info *pInfo, struct pid *pid, int arg)
+{
+        struct r3964_client_info *pClient;
+        struct r3964_client_info **ppClient;
+        struct r3964_message *pMsg;
+
+        if ((arg & R3964_SIG_ALL) == 0) {
+                /* Remove client from client list */
+                for (ppClient = &pInfo->firstClient; *ppClient;
+                     ppClient = &(*ppClient)->next) {
+                        pClient = *ppClient;
+
+                        if (pClient->pid == pid) {
+                                TRACE_PS("removing client %d from client list",
+                                         pid_nr(pid));
+                                *ppClient = pClient->next;
+                                while (pClient->msg_count) {
+                                        pMsg = remove_msg(pInfo, pClient);
+                                        if (pMsg) {
+                                                kfree(pMsg);
+                                                TRACE_M("enable_signals - msg "
+                                                        "kfree %p", pMsg);
+                                        }
+                                }
+                                put_pid(pClient->pid);
+                                kfree(pClient);
+                                TRACE_M("enable_signals - kfree %p", pClient);
+                                return 0;
+                        }
+                }
+                return -EINVAL;
+        } else {
+                pClient = findClient(pInfo, pid);
+                if (pClient) {
+                        /* update signal options */
+                        pClient->sig_flags = arg;
+                } else {
+                        /* add client to client list */
+                        pClient = kmalloc(sizeof(struct r3964_client_info),
+                                        GFP_KERNEL);
+                        TRACE_M("enable_signals - kmalloc %p", pClient);
+                        if (pClient == NULL)
+                                return -ENOMEM;
+
+                        TRACE_PS("add client %d to client list", pid_nr(pid));
+                        spin_lock_init(&pClient->lock);
+                        pClient->sig_flags = arg;
+                        pClient->pid = get_pid(pid);
+                        pClient->next = pInfo->firstClient;
+                        pClient->first_msg = NULL;
+                        pClient->last_msg = NULL;
+                        pClient->next_block_to_read = NULL;
+                        pClient->msg_count = 0;
+                        pInfo->firstClient = pClient;
+                }
+        }
+
+        return 0;
+}
+
+static int read_telegram(struct r3964_info *pInfo, struct pid *pid,
+                         unsigned char __user * buf)
+{
+        struct r3964_client_info *pClient;
+        struct r3964_block_header *block;
+
+        if (!buf) {
+                return -EINVAL;
+        }
+
+        pClient = findClient(pInfo, pid);
+        if (pClient == NULL) {
+                return -EINVAL;
+        }
+
+        block = pClient->next_block_to_read;
+        if (!block) {
+                return 0;
+        } else {
+                if (copy_to_user(buf, block->data, block->length))
+                        return -EFAULT;
+
+                remove_client_block(pInfo, pClient);
+                return block->length;
+        }
+
+        return -EINVAL;
+}
+
+static void add_msg(struct r3964_client_info *pClient, int msg_id, int arg,
+                int error_code, struct r3964_block_header *pBlock)
+{
+        struct r3964_message *pMsg;
+        unsigned long flags;
+
+        if (pClient->msg_count < R3964_MAX_MSG_COUNT - 1) {
+queue_the_message:
+
+                pMsg = kmalloc(sizeof(struct r3964_message),
+                                error_code ? GFP_ATOMIC : GFP_KERNEL);
+                TRACE_M("add_msg - kmalloc %p", pMsg);
+                if (pMsg == NULL) {
+                        return;
+                }
+
+                spin_lock_irqsave(&pClient->lock, flags);
+
+                pMsg->msg_id = msg_id;
+                pMsg->arg = arg;
+                pMsg->error_code = error_code;
+                pMsg->block = pBlock;
+                pMsg->next = NULL;
+
+                if (pClient->last_msg == NULL) {
+                        pClient->first_msg = pClient->last_msg = pMsg;
+                } else {
+                        pClient->last_msg->next = pMsg;
+                        pClient->last_msg = pMsg;
+                }
+
+                pClient->msg_count++;
+
+                if (pBlock != NULL) {
+                        pBlock->locks++;
+                }
+                spin_unlock_irqrestore(&pClient->lock, flags);
+        } else {
+                if ((pClient->last_msg->msg_id == R3964_MSG_ACK)
+                    && (pClient->last_msg->error_code == R3964_OVERFLOW)) {
+                        pClient->last_msg->arg++;
+                        TRACE_PE("add_msg - inc prev OVERFLOW-msg");
+                } else {
+                        msg_id = R3964_MSG_ACK;
+                        arg = 0;
+                        error_code = R3964_OVERFLOW;
+                        pBlock = NULL;
+                        TRACE_PE("add_msg - queue OVERFLOW-msg");
+                        goto queue_the_message;
+                }
+        }
+        /* Send SIGIO signal to client process: */
+        if (pClient->sig_flags & R3964_USE_SIGIO) {
+                kill_pid(pClient->pid, SIGIO, 1);
+        }
+}
+
+static struct r3964_message *remove_msg(struct r3964_info *pInfo,
+                                        struct r3964_client_info *pClient)
+{
+        struct r3964_message *pMsg = NULL;
+        unsigned long flags;
+
+        if (pClient->first_msg) {
+                spin_lock_irqsave(&pClient->lock, flags);
+
+                pMsg = pClient->first_msg;
+                pClient->first_msg = pMsg->next;
+                if (pClient->first_msg == NULL) {
+                        pClient->last_msg = NULL;
+                }
+
+                pClient->msg_count--;
+                if (pMsg->block) {
+                        remove_client_block(pInfo, pClient);
+                        pClient->next_block_to_read = pMsg->block;
+                }
+                spin_unlock_irqrestore(&pClient->lock, flags);
+        }
+        return pMsg;
+}
+
+static void remove_client_block(struct r3964_info *pInfo,
+                                struct r3964_client_info *pClient)
+{
+        struct r3964_block_header *block;
+
+        TRACE_PS("remove_client_block PID %d", pid_nr(pClient->pid));
+
+        block = pClient->next_block_to_read;
+        if (block) {
+                block->locks--;
+                if (block->locks == 0) {
+                        remove_from_rx_queue(pInfo, block);
+                }
+        }
+        pClient->next_block_to_read = NULL;
+}
+
+/*************************************************************
+ * Line discipline routines
+ *************************************************************/
+
+static int r3964_open(struct tty_struct *tty)
+{
+        struct r3964_info *pInfo;
+
+        TRACE_L("open");
+        TRACE_L("tty=%p, PID=%d, disc_data=%p",
+                tty, current->pid, tty->disc_data);
+
+        pInfo = kmalloc(sizeof(struct r3964_info), GFP_KERNEL);
+        TRACE_M("r3964_open - info kmalloc %p", pInfo);
+
+        if (!pInfo) {
+                printk(KERN_ERR "r3964: failed to alloc info structure\n");
+                return -ENOMEM;
+        }
+
+        pInfo->rx_buf = kmalloc(RX_BUF_SIZE, GFP_KERNEL);
+        TRACE_M("r3964_open - rx_buf kmalloc %p", pInfo->rx_buf);
+
+        if (!pInfo->rx_buf) {
+                printk(KERN_ERR "r3964: failed to alloc receive buffer\n");
+                kfree(pInfo);
+                TRACE_M("r3964_open - info kfree %p", pInfo);
+                return -ENOMEM;
+        }
+
+        pInfo->tx_buf = kmalloc(TX_BUF_SIZE, GFP_KERNEL);
+        TRACE_M("r3964_open - tx_buf kmalloc %p", pInfo->tx_buf);
+
+        if (!pInfo->tx_buf) {
+                printk(KERN_ERR "r3964: failed to alloc transmit buffer\n");
+                kfree(pInfo->rx_buf);
+                TRACE_M("r3964_open - rx_buf kfree %p", pInfo->rx_buf);
+                kfree(pInfo);
+                TRACE_M("r3964_open - info kfree %p", pInfo);
+                return -ENOMEM;
+        }
+
+        spin_lock_init(&pInfo->lock);
+        pInfo->tty = tty;
+        init_waitqueue_head(&pInfo->read_wait);
+        pInfo->priority = R3964_MASTER;
+        pInfo->rx_first = pInfo->rx_last = NULL;
+        pInfo->tx_first = pInfo->tx_last = NULL;
+        pInfo->rx_position = 0;
+        pInfo->tx_position = 0;
+        pInfo->last_rx = 0;
+        pInfo->blocks_in_rx_queue = 0;
+        pInfo->firstClient = NULL;
+        pInfo->state = R3964_IDLE;
+        pInfo->flags = R3964_DEBUG;
+        pInfo->nRetry = 0;
+
+        tty->disc_data = pInfo;
+        tty->receive_room = 65536;
+
+        setup_timer(&pInfo->tmr, on_timeout, (unsigned long)pInfo);
+
+        return 0;
+}
+
+static void r3964_close(struct tty_struct *tty)
+{
+        struct r3964_info *pInfo = tty->disc_data;
+        struct r3964_client_info *pClient, *pNext;
+        struct r3964_message *pMsg;
+        struct r3964_block_header *pHeader, *pNextHeader;
+        unsigned long flags;
+
+        TRACE_L("close");
+
+        /*
+         * Make sure that our task queue isn't activated.  If it
+         * is, take it out of the linked list.
+         */
+        del_timer_sync(&pInfo->tmr);
+
+        /* Remove client-structs and message queues: */
+        pClient = pInfo->firstClient;
+        while (pClient) {
+                pNext = pClient->next;
+                while (pClient->msg_count) {
+                        pMsg = remove_msg(pInfo, pClient);
+                        if (pMsg) {
+                                kfree(pMsg);
+                                TRACE_M("r3964_close - msg kfree %p", pMsg);
+                        }
+                }
+                put_pid(pClient->pid);
+                kfree(pClient);
+                TRACE_M("r3964_close - client kfree %p", pClient);
+                pClient = pNext;
+        }
+        /* Remove jobs from tx_queue: */
+        spin_lock_irqsave(&pInfo->lock, flags);
+        pHeader = pInfo->tx_first;
+        pInfo->tx_first = pInfo->tx_last = NULL;
+        spin_unlock_irqrestore(&pInfo->lock, flags);
+
+        while (pHeader) {
+                pNextHeader = pHeader->next;
+                kfree(pHeader);
+                pHeader = pNextHeader;
+        }
+
+        /* Free buffers: */
+        wake_up_interruptible(&pInfo->read_wait);
+        kfree(pInfo->rx_buf);
+        TRACE_M("r3964_close - rx_buf kfree %p", pInfo->rx_buf);
+        kfree(pInfo->tx_buf);
+        TRACE_M("r3964_close - tx_buf kfree %p", pInfo->tx_buf);
+        kfree(pInfo);
+        TRACE_M("r3964_close - info kfree %p", pInfo);
+}
+
+static ssize_t r3964_read(struct tty_struct *tty, struct file *file,
+                          unsigned char __user * buf, size_t nr)
+{
+        struct r3964_info *pInfo = tty->disc_data;
+        struct r3964_client_info *pClient;
+        struct r3964_message *pMsg;
+        struct r3964_client_message theMsg;
+        int ret;
+
+        TRACE_L("read()");
+
+        tty_lock();
+
+        pClient = findClient(pInfo, task_pid(current));
+        if (pClient) {
+                pMsg = remove_msg(pInfo, pClient);
+                if (pMsg == NULL) {
+                        /* no messages available. */
+                        if (file->f_flags & O_NONBLOCK) {
+                                ret = -EAGAIN;
+                                goto unlock;
+                        }
+                        /* block until there is a message: */
+                        wait_event_interruptible_tty(pInfo->read_wait,
+                                        (pMsg = remove_msg(pInfo, pClient)));
+                }
+
+                /* If we still haven't got a message, we must have been signalled */
+
+                if (!pMsg) {
+                        ret = -EINTR;
+                        goto unlock;
+                }
+
+                /* deliver msg to client process: */
+                theMsg.msg_id = pMsg->msg_id;
+                theMsg.arg = pMsg->arg;
+                theMsg.error_code = pMsg->error_code;
+                ret = sizeof(struct r3964_client_message);
+
+                kfree(pMsg);
+                TRACE_M("r3964_read - msg kfree %p", pMsg);
+
+                if (copy_to_user(buf, &theMsg, ret)) {
+                        ret = -EFAULT;
+                        goto unlock;
+                }
+
+                TRACE_PS("read - return %d", ret);
+                goto unlock;
+        }
+        ret = -EPERM;
+unlock:
+        tty_unlock();
+        return ret;
+}
+
+static ssize_t r3964_write(struct tty_struct *tty, struct file *file,
+                           const unsigned char *data, size_t count)
+{
+        struct r3964_info *pInfo = tty->disc_data;
+        struct r3964_block_header *pHeader;
+        struct r3964_client_info *pClient;
+        unsigned char *new_data;
+
+        TRACE_L("write request, %d characters", count);
+/* 
+ * Verify the pointers 
+ */
+
+        if (!pInfo)
+                return -EIO;
+
+/*
+ * Ensure that the caller does not wish to send too much.
+ */
+        if (count > R3964_MTU) {
+                if (pInfo->flags & R3964_DEBUG) {
+                        TRACE_L(KERN_WARNING "r3964_write: truncating user "
+                                "packet from %u to mtu %d", count, R3964_MTU);
+                }
+                count = R3964_MTU;
+        }
+/*
+ * Allocate a buffer for the data and copy it from the buffer with header prepended
+ */
+        new_data = kmalloc(count + sizeof(struct r3964_block_header),
+                        GFP_KERNEL);
+        TRACE_M("r3964_write - kmalloc %p", new_data);
+        if (new_data == NULL) {
+                if (pInfo->flags & R3964_DEBUG) {
+                        printk(KERN_ERR "r3964_write: no memory\n");
+                }
+                return -ENOSPC;
+        }
+
+        pHeader = (struct r3964_block_header *)new_data;
+        pHeader->data = new_data + sizeof(struct r3964_block_header);
+        pHeader->length = count;
+        pHeader->locks = 0;
+        pHeader->owner = NULL;
+
+        tty_lock();
+
+        pClient = findClient(pInfo, task_pid(current));
+        if (pClient) {
+                pHeader->owner = pClient;
+        }
+
+        memcpy(pHeader->data, data, count);     /* We already verified this */
+
+        if (pInfo->flags & R3964_DEBUG) {
+                dump_block(pHeader->data, count);
+        }
+
+/*
+ * Add buffer to transmit-queue:
+ */
+        add_tx_queue(pInfo, pHeader);
+        trigger_transmit(pInfo);
+
+        tty_unlock();
+
+        return 0;
+}
+
+static int r3964_ioctl(struct tty_struct *tty, struct file *file,
+                unsigned int cmd, unsigned long arg)
+{
+        struct r3964_info *pInfo = tty->disc_data;
+        if (pInfo == NULL)
+                return -EINVAL;
+        switch (cmd) {
+        case R3964_ENABLE_SIGNALS:
+                return enable_signals(pInfo, task_pid(current), arg);
+        case R3964_SETPRIORITY:
+                if (arg < R3964_MASTER || arg > R3964_SLAVE)
+                        return -EINVAL;
+                pInfo->priority = arg & 0xff;
+                return 0;
+        case R3964_USE_BCC:
+                if (arg)
+                        pInfo->flags |= R3964_BCC;
+                else
+                        pInfo->flags &= ~R3964_BCC;
+                return 0;
+        case R3964_READ_TELEGRAM:
+                return read_telegram(pInfo, task_pid(current),
+                                (unsigned char __user *)arg);
+        default:
+                return -ENOIOCTLCMD;
+        }
+}
+
+static void r3964_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+        TRACE_L("set_termios");
+}
+
+/* Called without the kernel lock held - fine */
+static unsigned int r3964_poll(struct tty_struct *tty, struct file *file,
+                        struct poll_table_struct *wait)
+{
+        struct r3964_info *pInfo = tty->disc_data;
+        struct r3964_client_info *pClient;
+        struct r3964_message *pMsg = NULL;
+        unsigned long flags;
+        int result = POLLOUT;
+
+        TRACE_L("POLL");
+
+        pClient = findClient(pInfo, task_pid(current));
+        if (pClient) {
+                poll_wait(file, &pInfo->read_wait, wait);
+                spin_lock_irqsave(&pInfo->lock, flags);
+                pMsg = pClient->first_msg;
+                spin_unlock_irqrestore(&pInfo->lock, flags);
+                if (pMsg)
+                        result |= POLLIN | POLLRDNORM;
+        } else {
+                result = -EINVAL;
+        }
+        return result;
+}
+
+static void r3964_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+                        char *fp, int count)
+{
+        struct r3964_info *pInfo = tty->disc_data;
+        const unsigned char *p;
+        char *f, flags = 0;
+        int i;
+
+        for (i = count, p = cp, f = fp; i; i--, p++) {
+                if (f)
+                        flags = *f++;
+                if (flags == TTY_NORMAL) {
+                        receive_char(pInfo, *p);
+                } else {
+                        receive_error(pInfo, flags);
+                }
+
+        }
+}
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_LDISC(N_R3964);
diff --git a/drivers/tty/n_tracerouter.c b/drivers/tty/n_tracerouter.c
new file mode 100644
index 000000000000..1f063d3aa32f
--- /dev/null
+++ b/drivers/tty/n_tracerouter.c
@@ -0,0 +1,243 @@
+/*
+ *  n_tracerouter.c - Trace data router through tty space
+ *
+ *  Copyright (C) Intel 2011
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This trace router uses the Linux line discipline framework to route
+ * trace data coming from a HW Modem to a PTI (Parallel Trace Module) port.
+ * The solution is not specific to a HW modem and this line disciple can
+ * be used to route any stream of data in kernel space.
+ * This is part of a solution for the P1149.7, compact JTAG, standard.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#include <linux/tty.h>
+#include <linux/tty_ldisc.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <asm-generic/bug.h>
+#include "n_tracesink.h"
+
+/*
+ * Other ldisc drivers use 65536 which basically means,
+ * 'I can always accept 64k' and flow control is off.
+ * This number is deemed appropriate for this driver.
+ */
+#define RECEIVE_ROOM    65536
+#define DRIVERNAME      "n_tracerouter"
+
+/*
+ * struct to hold private configuration data for this ldisc.
+ * opencalled is used to hold if this ldisc has been opened.
+ * kref_tty holds the tty reference the ldisc sits on top of.
+ */
+struct tracerouter_data {
+        u8 opencalled;
+        struct tty_struct *kref_tty;
+};
+static struct tracerouter_data *tr_data;
+
+/* lock for when tty reference is being used */
+static DEFINE_MUTEX(routelock);
+
+/**
+ * n_tracerouter_open() - Called when a tty is opened by a SW entity.
+ * @tty: terminal device to the ldisc.
+ *
+ * Return:
+ *      0 for success.
+ *
+ * Caveats: This should only be opened one time per SW entity.
+ */
+static int n_tracerouter_open(struct tty_struct *tty)
+{
+        int retval = -EEXIST;
+
+        mutex_lock(&routelock);
+        if (tr_data->opencalled == 0) {
+
+                tr_data->kref_tty = tty_kref_get(tty);
+                if (tr_data->kref_tty == NULL) {
+                        retval = -EFAULT;
+                } else {
+                        tr_data->opencalled = 1;
+                        tty->disc_data      = tr_data;
+                        tty->receive_room   = RECEIVE_ROOM;
+                        tty_driver_flush_buffer(tty);
+                        retval = 0;
+                }
+        }
+        mutex_unlock(&routelock);
+        return retval;
+}
+
+/**
+ * n_tracerouter_close() - close connection
+ * @tty: terminal device to the ldisc.
+ *
+ * Called when a software entity wants to close a connection.
+ */
+static void n_tracerouter_close(struct tty_struct *tty)
+{
+        struct tracerouter_data *tptr = tty->disc_data;
+
+        mutex_lock(&routelock);
+        WARN_ON(tptr->kref_tty != tr_data->kref_tty);
+        tty_driver_flush_buffer(tty);
+        tty_kref_put(tr_data->kref_tty);
+        tr_data->kref_tty = NULL;
+        tr_data->opencalled = 0;
+        tty->disc_data = NULL;
+        mutex_unlock(&routelock);
+}
+
+/**
+ * n_tracerouter_read() - read request from user space
+ * @tty:  terminal device passed into the ldisc.
+ * @file: pointer to open file object.
+ * @buf:  pointer to the data buffer that gets eventually returned.
+ * @nr:   number of bytes of the data buffer that is returned.
+ *
+ * function that allows read() functionality in userspace. By default if this
+ * is not implemented it returns -EIO. This module is functioning like a
+ * router via n_tracerouter_receivebuf(), and there is no real requirement
+ * to implement this function. However, an error return value other than
+ * -EIO should be used just to show that there was an intent not to have
+ * this function implemented.  Return value based on read() man pages.
+ *
+ * Return:
+ *       -EINVAL
+ */
+static ssize_t n_tracerouter_read(struct tty_struct *tty, struct file *file,
+                                  unsigned char __user *buf, size_t nr) {
+        return -EINVAL;
+}
+
+/**
+ * n_tracerouter_write() - Function that allows write() in userspace.
+ * @tty:  terminal device passed into the ldisc.
+ * @file: pointer to open file object.
+ * @buf:  pointer to the data buffer that gets eventually returned.
+ * @nr:   number of bytes of the data buffer that is returned.
+ *
+ * By default if this is not implemented, it returns -EIO.
+ * This should not be implemented, ever, because
+ * 1. this driver is functioning like a router via
+ *    n_tracerouter_receivebuf()
+ * 2. No writes to HW will ever go through this line discpline driver.
+ * However, an error return value other than -EIO should be used
+ * just to show that there was an intent not to have this function
+ * implemented.  Return value based on write() man pages.
+ *
+ * Return:
+ *      -EINVAL
+ */
+static ssize_t n_tracerouter_write(struct tty_struct *tty, struct file *file,
+                                   const unsigned char *buf, size_t nr) {
+        return -EINVAL;
+}
+
+/**
+ * n_tracerouter_receivebuf() - Routing function for driver.
+ * @tty: terminal device passed into the ldisc.  It's assumed
+ *       tty will never be NULL.
+ * @cp:  buffer, block of characters to be eventually read by
+ *       someone, somewhere (user read() call or some kernel function).
+ * @fp:  flag buffer.
+ * @count: number of characters (aka, bytes) in cp.
+ *
+ * This function takes the input buffer, cp, and passes it to
+ * an external API function for processing.
+ */
+static void n_tracerouter_receivebuf(struct tty_struct *tty,
+                                        const unsigned char *cp,
+                                        char *fp, int count)
+{
+        mutex_lock(&routelock);
+        n_tracesink_datadrain((u8 *) cp, count);
+        mutex_unlock(&routelock);
+}
+
+/*
+ * Flush buffer is not impelemented as the ldisc has no internal buffering
+ * so the tty_driver_flush_buffer() is sufficient for this driver's needs.
+ */
+
+static struct tty_ldisc_ops tty_ptirouter_ldisc = {
+        .owner          = THIS_MODULE,
+        .magic          = TTY_LDISC_MAGIC,
+        .name           = DRIVERNAME,
+        .open           = n_tracerouter_open,
+        .close          = n_tracerouter_close,
+        .read           = n_tracerouter_read,
+        .write          = n_tracerouter_write,
+        .receive_buf    = n_tracerouter_receivebuf
+};
+
+/**
+ * n_tracerouter_init - module initialisation
+ *
+ * Registers this module as a line discipline driver.
+ *
+ * Return:
+ *      0 for success, any other value error.
+ */
+static int __init n_tracerouter_init(void)
+{
+        int retval;
+
+        tr_data = kzalloc(sizeof(struct tracerouter_data), GFP_KERNEL);
+        if (tr_data == NULL)
+                return -ENOMEM;
+
+
+        /* Note N_TRACEROUTER is defined in linux/tty.h */
+        retval = tty_register_ldisc(N_TRACEROUTER, &tty_ptirouter_ldisc);
+        if (retval < 0) {
+                pr_err("%s: Registration failed: %d\n", __func__, retval);
+                kfree(tr_data);
+        }
+        return retval;
+}
+
+/**
+ * n_tracerouter_exit - module unload
+ *
+ * Removes this module as a line discipline driver.
+ */
+static void __exit n_tracerouter_exit(void)
+{
+        int retval = tty_unregister_ldisc(N_TRACEROUTER);
+
+        if (retval < 0)
+                pr_err("%s: Unregistration failed: %d\n", __func__,  retval);
+        else
+                kfree(tr_data);
+}
+
+module_init(n_tracerouter_init);
+module_exit(n_tracerouter_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jay Freyensee");
+MODULE_ALIAS_LDISC(N_TRACEROUTER);
+MODULE_DESCRIPTION("Trace router ldisc driver");
diff --git a/drivers/tty/n_tracesink.c b/drivers/tty/n_tracesink.c
new file mode 100644
index 000000000000..ddce58b973d2
--- /dev/null
+++ b/drivers/tty/n_tracesink.c
@@ -0,0 +1,238 @@
+/*
+ *  n_tracesink.c - Trace data router and sink path through tty space.
+ *
+ *  Copyright (C) Intel 2011
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * The trace sink uses the Linux line discipline framework to receive
+ * trace data coming from the PTI source line discipline driver
+ * to a user-desired tty port, like USB.
+ * This is to provide a way to extract modem trace data on
+ * devices that do not have a PTI HW module, or just need modem
+ * trace data to come out of a different HW output port.
+ * This is part of a solution for the P1149.7, compact JTAG, standard.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#include <linux/tty.h>
+#include <linux/tty_ldisc.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <asm-generic/bug.h>
+#include "n_tracesink.h"
+
+/*
+ * Other ldisc drivers use 65536 which basically means,
+ * 'I can always accept 64k' and flow control is off.
+ * This number is deemed appropriate for this driver.
+ */
+#define RECEIVE_ROOM    65536
+#define DRIVERNAME      "n_tracesink"
+
+/*
+ * there is a quirk with this ldisc is he can write data
+ * to a tty from anyone calling his kernel API, which
+ * meets customer requirements in the drivers/misc/pti.c
+ * project.  So he needs to know when he can and cannot write when
+ * the API is called. In theory, the API can be called
+ * after an init() but before a successful open() which
+ * would crash the system if tty is not checked.
+ */
+static struct tty_struct *this_tty;
+static DEFINE_MUTEX(writelock);
+
+/**
+ * n_tracesink_open() - Called when a tty is opened by a SW entity.
+ * @tty: terminal device to the ldisc.
+ *
+ * Return:
+ *      0 for success,
+ *      -EFAULT = couldn't get a tty kref n_tracesink will sit
+ *       on top of
+ *      -EEXIST = open() called successfully once and it cannot
+ *      be called again.
+ *
+ * Caveats: open() should only be successful the first time a
+ * SW entity calls it.
+ */
+static int n_tracesink_open(struct tty_struct *tty)
+{
+        int retval = -EEXIST;
+
+        mutex_lock(&writelock);
+        if (this_tty == NULL) {
+                this_tty = tty_kref_get(tty);
+                if (this_tty == NULL) {
+                        retval = -EFAULT;
+                } else {
+                        tty->disc_data = this_tty;
+                        tty_driver_flush_buffer(tty);
+                        retval = 0;
+                }
+        }
+        mutex_unlock(&writelock);
+
+        return retval;
+}
+
+/**
+ * n_tracesink_close() - close connection
+ * @tty: terminal device to the ldisc.
+ *
+ * Called when a software entity wants to close a connection.
+ */
+static void n_tracesink_close(struct tty_struct *tty)
+{
+        mutex_lock(&writelock);
+        tty_driver_flush_buffer(tty);
+        tty_kref_put(this_tty);
+        this_tty = NULL;
+        tty->disc_data = NULL;
+        mutex_unlock(&writelock);
+}
+
+/**
+ * n_tracesink_read() - read request from user space
+ * @tty:  terminal device passed into the ldisc.
+ * @file: pointer to open file object.
+ * @buf:  pointer to the data buffer that gets eventually returned.
+ * @nr:   number of bytes of the data buffer that is returned.
+ *
+ * function that allows read() functionality in userspace. By default if this
+ * is not implemented it returns -EIO. This module is functioning like a
+ * router via n_tracesink_receivebuf(), and there is no real requirement
+ * to implement this function. However, an error return value other than
+ * -EIO should be used just to show that there was an intent not to have
+ * this function implemented.  Return value based on read() man pages.
+ *
+ * Return:
+ *       -EINVAL
+ */
+static ssize_t n_tracesink_read(struct tty_struct *tty, struct file *file,
+                                unsigned char __user *buf, size_t nr) {
+        return -EINVAL;
+}
+
+/**
+ * n_tracesink_write() - Function that allows write() in userspace.
+ * @tty:  terminal device passed into the ldisc.
+ * @file: pointer to open file object.
+ * @buf:  pointer to the data buffer that gets eventually returned.
+ * @nr:   number of bytes of the data buffer that is returned.
+ *
+ * By default if this is not implemented, it returns -EIO.
+ * This should not be implemented, ever, because
+ * 1. this driver is functioning like a router via
+ *    n_tracesink_receivebuf()
+ * 2. No writes to HW will ever go through this line discpline driver.
+ * However, an error return value other than -EIO should be used
+ * just to show that there was an intent not to have this function
+ * implemented.  Return value based on write() man pages.
+ *
+ * Return:
+ *      -EINVAL
+ */
+static ssize_t n_tracesink_write(struct tty_struct *tty, struct file *file,
+                                 const unsigned char *buf, size_t nr) {
+        return -EINVAL;
+}
+
+/**
+ * n_tracesink_datadrain() - Kernel API function used to route
+ *                           trace debugging data to user-defined
+ *                           port like USB.
+ *
+ * @buf:   Trace debuging data buffer to write to tty target
+ *         port. Null value will return with no write occurring.
+ * @count: Size of buf. Value of 0 or a negative number will
+ *         return with no write occuring.
+ *
+ * Caveat: If this line discipline does not set the tty it sits
+ * on top of via an open() call, this API function will not
+ * call the tty's write() call because it will have no pointer
+ * to call the write().
+ */
+void n_tracesink_datadrain(u8 *buf, int count)
+{
+        mutex_lock(&writelock);
+
+        if ((buf != NULL) && (count > 0) && (this_tty != NULL))
+                this_tty->ops->write(this_tty, buf, count);
+
+        mutex_unlock(&writelock);
+}
+EXPORT_SYMBOL_GPL(n_tracesink_datadrain);
+
+/*
+ * Flush buffer is not impelemented as the ldisc has no internal buffering
+ * so the tty_driver_flush_buffer() is sufficient for this driver's needs.
+ */
+
+/*
+ * tty_ldisc function operations for this driver.
+ */
+static struct tty_ldisc_ops tty_n_tracesink = {
+        .owner          = THIS_MODULE,
+        .magic          = TTY_LDISC_MAGIC,
+        .name           = DRIVERNAME,
+        .open           = n_tracesink_open,
+        .close          = n_tracesink_close,
+        .read           = n_tracesink_read,
+        .write          = n_tracesink_write
+};
+
+/**
+ * n_tracesink_init-    module initialisation
+ *
+ * Registers this module as a line discipline driver.
+ *
+ * Return:
+ *      0 for success, any other value error.
+ */
+static int __init n_tracesink_init(void)
+{
+        /* Note N_TRACESINK is defined in linux/tty.h */
+        int retval = tty_register_ldisc(N_TRACESINK, &tty_n_tracesink);
+
+        if (retval < 0)
+                pr_err("%s: Registration failed: %d\n", __func__, retval);
+
+        return retval;
+}
+
+/**
+ * n_tracesink_exit -   module unload
+ *
+ * Removes this module as a line discipline driver.
+ */
+static void __exit n_tracesink_exit(void)
+{
+        int retval = tty_unregister_ldisc(N_TRACESINK);
+
+        if (retval < 0)
+                pr_err("%s: Unregistration failed: %d\n", __func__,  retval);
+}
+
+module_init(n_tracesink_init);
+module_exit(n_tracesink_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jay Freyensee");
+MODULE_ALIAS_LDISC(N_TRACESINK);
+MODULE_DESCRIPTION("Trace sink ldisc driver");
diff --git a/drivers/tty/n_tracesink.h b/drivers/tty/n_tracesink.h
new file mode 100644
index 000000000000..a68bb44f1ef5
--- /dev/null
+++ b/drivers/tty/n_tracesink.h
@@ -0,0 +1,36 @@
+/*
+ *  n_tracesink.h - Kernel driver API to route trace data in kernel space.
+ *
+ *  Copyright (C) Intel 2011
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * The PTI (Parallel Trace Interface) driver directs trace data routed from
+ * various parts in the system out through the Intel Penwell PTI port and
+ * out of the mobile device for analysis with a debugging tool
+ * (Lauterbach, Fido). This is part of a solution for the MIPI P1149.7,
+ * compact JTAG, standard.
+ *
+ * This header file is used by n_tracerouter to be able to send the
+ * data of it's tty port to the tty port this module sits.  This
+ * mechanism can also be used independent of the PTI module.
+ *
+ */
+
+#ifndef N_TRACESINK_H_
+#define N_TRACESINK_H_
+
+void n_tracesink_datadrain(u8 *buf, int count);
+
+#endif
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
new file mode 100644
index 000000000000..c3954fbf6ac4
--- /dev/null
+++ b/drivers/tty/n_tty.c
@@ -0,0 +1,2128 @@
+/*
+ * n_tty.c --- implements the N_TTY line discipline.
+ *
+ * This code used to be in tty_io.c, but things are getting hairy
+ * enough that it made sense to split things off.  (The N_TTY
+ * processing has changed so much that it's hardly recognizable,
+ * anyway...)
+ *
+ * Note that the open routine for N_TTY is guaranteed never to return
+ * an error.  This is because Linux will fall back to setting a line
+ * to N_TTY if it can not switch to any other line discipline.
+ *
+ * Written by Theodore Ts'o, Copyright 1994.
+ *
+ * This file also contains code originally written by Linus Torvalds,
+ * Copyright 1991, 1992, 1993, and by Julian Cowley, Copyright 1994.
+ *
+ * This file may be redistributed under the terms of the GNU General Public
+ * License.
+ *
+ * Reduced memory usage for older ARM systems  - Russell King.
+ *
+ * 2000/01/20   Fixed SMP locking on put_tty_queue using bits of
+ *              the patch by Andrew J. Kroll <ag784@freenet.buffalo.edu>
+ *              who actually finally proved there really was a race.
+ *
+ * 2002/03/18   Implemented n_tty_wakeup to send SIGIO POLL_OUTs to
+ *              waiting writing processes-Sapan Bhatia <sapan@corewars.org>.
+ *              Also fixed a bug in BLOCKING mode where n_tty_write returns
+ *              EAGAIN
+ */
+
+#include <linux/types.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/fcntl.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/timer.h>
+#include <linux/ctype.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/bitops.h>
+#include <linux/audit.h>
+#include <linux/file.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+
+#include <asm/system.h>
+
+/* number of characters left in xmit buffer before select has we have room */
+#define WAKEUP_CHARS 256
+
+/*
+ * This defines the low- and high-watermarks for throttling and
+ * unthrottling the TTY driver.  These watermarks are used for
+ * controlling the space in the read buffer.
+ */
+#define TTY_THRESHOLD_THROTTLE          128 /* now based on remaining room */
+#define TTY_THRESHOLD_UNTHROTTLE        128
+
+/*
+ * Special byte codes used in the echo buffer to represent operations
+ * or special handling of characters.  Bytes in the echo buffer that
+ * are not part of such special blocks are treated as normal character
+ * codes.
+ */
+#define ECHO_OP_START 0xff
+#define ECHO_OP_MOVE_BACK_COL 0x80
+#define ECHO_OP_SET_CANON_COL 0x81
+#define ECHO_OP_ERASE_TAB 0x82
+
+static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
+                               unsigned char __user *ptr)
+{
+        tty_audit_add_data(tty, &x, 1);
+        return put_user(x, ptr);
+}
+
+/**
+ *      n_tty_set__room -       receive space
+ *      @tty: terminal
+ *
+ *      Called by the driver to find out how much data it is
+ *      permitted to feed to the line discipline without any being lost
+ *      and thus to manage flow control. Not serialized. Answers for the
+ *      "instant".
+ */
+
+static void n_tty_set_room(struct tty_struct *tty)
+{
+        /* tty->read_cnt is not read locked ? */
+        int     left = N_TTY_BUF_SIZE - tty->read_cnt - 1;
+        int old_left;
+
+        /*
+         * If we are doing input canonicalization, and there are no
+         * pending newlines, let characters through without limit, so
+         * that erase characters will be handled.  Other excess
+         * characters will be beeped.
+         */
+        if (left <= 0)
+                left = tty->icanon && !tty->canon_data;
+        old_left = tty->receive_room;
+        tty->receive_room = left;
+
+        /* Did this open up the receive buffer? We may need to flip */
+        if (left && !old_left)
+                schedule_work(&tty->buf.work);
+}
+
+static void put_tty_queue_nolock(unsigned char c, struct tty_struct *tty)
+{
+        if (tty->read_cnt < N_TTY_BUF_SIZE) {
+                tty->read_buf[tty->read_head] = c;
+                tty->read_head = (tty->read_head + 1) & (N_TTY_BUF_SIZE-1);
+                tty->read_cnt++;
+        }
+}
+
+/**
+ *      put_tty_queue           -       add character to tty
+ *      @c: character
+ *      @tty: tty device
+ *
+ *      Add a character to the tty read_buf queue. This is done under the
+ *      read_lock to serialize character addition and also to protect us
+ *      against parallel reads or flushes
+ */
+
+static void put_tty_queue(unsigned char c, struct tty_struct *tty)
+{
+        unsigned long flags;
+        /*
+         *      The problem of stomping on the buffers ends here.
+         *      Why didn't anyone see this one coming? --AJK
+        */
+        spin_lock_irqsave(&tty->read_lock, flags);
+        put_tty_queue_nolock(c, tty);
+        spin_unlock_irqrestore(&tty->read_lock, flags);
+}
+
+/**
+ *      check_unthrottle        -       allow new receive data
+ *      @tty; tty device
+ *
+ *      Check whether to call the driver unthrottle functions
+ *
+ *      Can sleep, may be called under the atomic_read_lock mutex but
+ *      this is not guaranteed.
+ */
+static void check_unthrottle(struct tty_struct *tty)
+{
+        if (tty->count)
+                tty_unthrottle(tty);
+}
+
+/**
+ *      reset_buffer_flags      -       reset buffer state
+ *      @tty: terminal to reset
+ *
+ *      Reset the read buffer counters, clear the flags,
+ *      and make sure the driver is unthrottled. Called
+ *      from n_tty_open() and n_tty_flush_buffer().
+ *
+ *      Locking: tty_read_lock for read fields.
+ */
+
+static void reset_buffer_flags(struct tty_struct *tty)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&tty->read_lock, flags);
+        tty->read_head = tty->read_tail = tty->read_cnt = 0;
+        spin_unlock_irqrestore(&tty->read_lock, flags);
+
+        mutex_lock(&tty->echo_lock);
+        tty->echo_pos = tty->echo_cnt = tty->echo_overrun = 0;
+        mutex_unlock(&tty->echo_lock);
+
+        tty->canon_head = tty->canon_data = tty->erasing = 0;
+        memset(&tty->read_flags, 0, sizeof tty->read_flags);
+        n_tty_set_room(tty);
+        check_unthrottle(tty);
+}
+
+/**
+ *      n_tty_flush_buffer      -       clean input queue
+ *      @tty:   terminal device
+ *
+ *      Flush the input buffer. Called when the line discipline is
+ *      being closed, when the tty layer wants the buffer flushed (eg
+ *      at hangup) or when the N_TTY line discipline internally has to
+ *      clean the pending queue (for example some signals).
+ *
+ *      Locking: ctrl_lock, read_lock.
+ */
+
+static void n_tty_flush_buffer(struct tty_struct *tty)
+{
+        unsigned long flags;
+        /* clear everything and unthrottle the driver */
+        reset_buffer_flags(tty);
+
+        if (!tty->link)
+                return;
+
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        if (tty->link->packet) {
+                tty->ctrl_status |= TIOCPKT_FLUSHREAD;
+                wake_up_interruptible(&tty->link->read_wait);
+        }
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+}
+
+/**
+ *      n_tty_chars_in_buffer   -       report available bytes
+ *      @tty: tty device
+ *
+ *      Report the number of characters buffered to be delivered to user
+ *      at this instant in time.
+ *
+ *      Locking: read_lock
+ */
+
+static ssize_t n_tty_chars_in_buffer(struct tty_struct *tty)
+{
+        unsigned long flags;
+        ssize_t n = 0;
+
+        spin_lock_irqsave(&tty->read_lock, flags);
+        if (!tty->icanon) {
+                n = tty->read_cnt;
+        } else if (tty->canon_data) {
+                n = (tty->canon_head > tty->read_tail) ?
+                        tty->canon_head - tty->read_tail :
+                        tty->canon_head + (N_TTY_BUF_SIZE - tty->read_tail);
+        }
+        spin_unlock_irqrestore(&tty->read_lock, flags);
+        return n;
+}
+
+/**
+ *      is_utf8_continuation    -       utf8 multibyte check
+ *      @c: byte to check
+ *
+ *      Returns true if the utf8 character 'c' is a multibyte continuation
+ *      character. We use this to correctly compute the on screen size
+ *      of the character when printing
+ */
+
+static inline int is_utf8_continuation(unsigned char c)
+{
+        return (c & 0xc0) == 0x80;
+}
+
+/**
+ *      is_continuation         -       multibyte check
+ *      @c: byte to check
+ *
+ *      Returns true if the utf8 character 'c' is a multibyte continuation
+ *      character and the terminal is in unicode mode.
+ */
+
+static inline int is_continuation(unsigned char c, struct tty_struct *tty)
+{
+        return I_IUTF8(tty) && is_utf8_continuation(c);
+}
+
+/**
+ *      do_output_char                  -       output one character
+ *      @c: character (or partial unicode symbol)
+ *      @tty: terminal device
+ *      @space: space available in tty driver write buffer
+ *
+ *      This is a helper function that handles one output character
+ *      (including special characters like TAB, CR, LF, etc.),
+ *      doing OPOST processing and putting the results in the
+ *      tty driver's write buffer.
+ *
+ *      Note that Linux currently ignores TABDLY, CRDLY, VTDLY, FFDLY
+ *      and NLDLY.  They simply aren't relevant in the world today.
+ *      If you ever need them, add them here.
+ *
+ *      Returns the number of bytes of buffer space used or -1 if
+ *      no space left.
+ *
+ *      Locking: should be called under the output_lock to protect
+ *               the column state and space left in the buffer
+ */
+
+static int do_output_char(unsigned char c, struct tty_struct *tty, int space)
+{
+        int     spaces;
+
+        if (!space)
+                return -1;
+
+        switch (c) {
+        case '\n':
+                if (O_ONLRET(tty))
+                        tty->column = 0;
+                if (O_ONLCR(tty)) {
+                        if (space < 2)
+                                return -1;
+                        tty->canon_column = tty->column = 0;
+                        tty->ops->write(tty, "\r\n", 2);
+                        return 2;
+                }
+                tty->canon_column = tty->column;
+                break;
+        case '\r':
+                if (O_ONOCR(tty) && tty->column == 0)
+                        return 0;
+                if (O_OCRNL(tty)) {
+                        c = '\n';
+                        if (O_ONLRET(tty))
+                                tty->canon_column = tty->column = 0;
+                        break;
+                }
+                tty->canon_column = tty->column = 0;
+                break;
+        case '\t':
+                spaces = 8 - (tty->column & 7);
+                if (O_TABDLY(tty) == XTABS) {
+                        if (space < spaces)
+                                return -1;
+                        tty->column += spaces;
+                        tty->ops->write(tty, "        ", spaces);
+                        return spaces;
+                }
+                tty->column += spaces;
+                break;
+        case '\b':
+                if (tty->column > 0)
+                        tty->column--;
+                break;
+        default:
+                if (!iscntrl(c)) {
+                        if (O_OLCUC(tty))
+                                c = toupper(c);
+                        if (!is_continuation(c, tty))
+                                tty->column++;
+                }
+                break;
+        }
+
+        tty_put_char(tty, c);
+        return 1;
+}
+
+/**
+ *      process_output                  -       output post processor
+ *      @c: character (or partial unicode symbol)
+ *      @tty: terminal device
+ *
+ *      Output one character with OPOST processing.
+ *      Returns -1 when the output device is full and the character
+ *      must be retried.
+ *
+ *      Locking: output_lock to protect column state and space left
+ *               (also, this is called from n_tty_write under the
+ *                tty layer write lock)
+ */
+
+static int process_output(unsigned char c, struct tty_struct *tty)
+{
+        int     space, retval;
+
+        mutex_lock(&tty->output_lock);
+
+        space = tty_write_room(tty);
+        retval = do_output_char(c, tty, space);
+
+        mutex_unlock(&tty->output_lock);
+        if (retval < 0)
+                return -1;
+        else
+                return 0;
+}
+
+/**
+ *      process_output_block            -       block post processor
+ *      @tty: terminal device
+ *      @buf: character buffer
+ *      @nr: number of bytes to output
+ *
+ *      Output a block of characters with OPOST processing.
+ *      Returns the number of characters output.
+ *
+ *      This path is used to speed up block console writes, among other
+ *      things when processing blocks of output data. It handles only
+ *      the simple cases normally found and helps to generate blocks of
+ *      symbols for the console driver and thus improve performance.
+ *
+ *      Locking: output_lock to protect column state and space left
+ *               (also, this is called from n_tty_write under the
+ *                tty layer write lock)
+ */
+
+static ssize_t process_output_block(struct tty_struct *tty,
+                                    const unsigned char *buf, unsigned int nr)
+{
+        int     space;
+        int     i;
+        const unsigned char *cp;
+
+        mutex_lock(&tty->output_lock);
+
+        space = tty_write_room(tty);
+        if (!space) {
+                mutex_unlock(&tty->output_lock);
+                return 0;
+        }
+        if (nr > space)
+                nr = space;
+
+        for (i = 0, cp = buf; i < nr; i++, cp++) {
+                unsigned char c = *cp;
+
+                switch (c) {
+                case '\n':
+                        if (O_ONLRET(tty))
+                                tty->column = 0;
+                        if (O_ONLCR(tty))
+                                goto break_out;
+                        tty->canon_column = tty->column;
+                        break;
+                case '\r':
+                        if (O_ONOCR(tty) && tty->column == 0)
+                                goto break_out;
+                        if (O_OCRNL(tty))
+                                goto break_out;
+                        tty->canon_column = tty->column = 0;
+                        break;
+                case '\t':
+                        goto break_out;
+                case '\b':
+                        if (tty->column > 0)
+                                tty->column--;
+                        break;
+                default:
+                        if (!iscntrl(c)) {
+                                if (O_OLCUC(tty))
+                                        goto break_out;
+                                if (!is_continuation(c, tty))
+                                        tty->column++;
+                        }
+                        break;
+                }
+        }
+break_out:
+        i = tty->ops->write(tty, buf, i);
+
+        mutex_unlock(&tty->output_lock);
+        return i;
+}
+
+/**
+ *      process_echoes  -       write pending echo characters
+ *      @tty: terminal device
+ *
+ *      Write previously buffered echo (and other ldisc-generated)
+ *      characters to the tty.
+ *
+ *      Characters generated by the ldisc (including echoes) need to
+ *      be buffered because the driver's write buffer can fill during
+ *      heavy program output.  Echoing straight to the driver will
+ *      often fail under these conditions, causing lost characters and
+ *      resulting mismatches of ldisc state information.
+ *
+ *      Since the ldisc state must represent the characters actually sent
+ *      to the driver at the time of the write, operations like certain
+ *      changes in column state are also saved in the buffer and executed
+ *      here.
+ *
+ *      A circular fifo buffer is used so that the most recent characters
+ *      are prioritized.  Also, when control characters are echoed with a
+ *      prefixed "^", the pair is treated atomically and thus not separated.
+ *
+ *      Locking: output_lock to protect column state and space left,
+ *               echo_lock to protect the echo buffer
+ */
+
+static void process_echoes(struct tty_struct *tty)
+{
+        int     space, nr;
+        unsigned char c;
+        unsigned char *cp, *buf_end;
+
+        if (!tty->echo_cnt)
+                return;
+
+        mutex_lock(&tty->output_lock);
+        mutex_lock(&tty->echo_lock);
+
+        space = tty_write_room(tty);
+
+        buf_end = tty->echo_buf + N_TTY_BUF_SIZE;
+        cp = tty->echo_buf + tty->echo_pos;
+        nr = tty->echo_cnt;
+        while (nr > 0) {
+                c = *cp;
+                if (c == ECHO_OP_START) {
+                        unsigned char op;
+                        unsigned char *opp;
+                        int no_space_left = 0;
+
+                        /*
+                         * If the buffer byte is the start of a multi-byte
+                         * operation, get the next byte, which is either the
+                         * op code or a control character value.
+                         */
+                        opp = cp + 1;
+                        if (opp == buf_end)
+                                opp -= N_TTY_BUF_SIZE;
+                        op = *opp;
+
+                        switch (op) {
+                                unsigned int num_chars, num_bs;
+
+                        case ECHO_OP_ERASE_TAB:
+                                if (++opp == buf_end)
+                                        opp -= N_TTY_BUF_SIZE;
+                                num_chars = *opp;
+
+                                /*
+                                 * Determine how many columns to go back
+                                 * in order to erase the tab.
+                                 * This depends on the number of columns
+                                 * used by other characters within the tab
+                                 * area.  If this (modulo 8) count is from
+                                 * the start of input rather than from a
+                                 * previous tab, we offset by canon column.
+                                 * Otherwise, tab spacing is normal.
+                                 */
+                                if (!(num_chars & 0x80))
+                                        num_chars += tty->canon_column;
+                                num_bs = 8 - (num_chars & 7);
+
+                                if (num_bs > space) {
+                                        no_space_left = 1;
+                                        break;
+                                }
+                                space -= num_bs;
+                                while (num_bs--) {
+                                        tty_put_char(tty, '\b');
+                                        if (tty->column > 0)
+                                                tty->column--;
+                                }
+                                cp += 3;
+                                nr -= 3;
+                                break;
+
+                        case ECHO_OP_SET_CANON_COL:
+                                tty->canon_column = tty->column;
+                                cp += 2;
+                                nr -= 2;
+                                break;
+
+                        case ECHO_OP_MOVE_BACK_COL:
+                                if (tty->column > 0)
+                                        tty->column--;
+                                cp += 2;
+                                nr -= 2;
+                                break;
+
+                        case ECHO_OP_START:
+                                /* This is an escaped echo op start code */
+                                if (!space) {
+                                        no_space_left = 1;
+                                        break;
+                                }
+                                tty_put_char(tty, ECHO_OP_START);
+                                tty->column++;
+                                space--;
+                                cp += 2;
+                                nr -= 2;
+                                break;
+
+                        default:
+                                /*
+                                 * If the op is not a special byte code,
+                                 * it is a ctrl char tagged to be echoed
+                                 * as "^X" (where X is the letter
+                                 * representing the control char).
+                                 * Note that we must ensure there is
+                                 * enough space for the whole ctrl pair.
+                                 *
+                                 */
+                                if (space < 2) {
+                                        no_space_left = 1;
+                                        break;
+                                }
+                                tty_put_char(tty, '^');
+                                tty_put_char(tty, op ^ 0100);
+                                tty->column += 2;
+                                space -= 2;
+                                cp += 2;
+                                nr -= 2;
+                        }
+
+                        if (no_space_left)
+                                break;
+                } else {
+                        if (O_OPOST(tty) &&
+                            !(test_bit(TTY_HW_COOK_OUT, &tty->flags))) {
+                                int retval = do_output_char(c, tty, space);
+                                if (retval < 0)
+                                        break;
+                                space -= retval;
+                        } else {
+                                if (!space)
+                                        break;
+                                tty_put_char(tty, c);
+                                space -= 1;
+                        }
+                        cp += 1;
+                        nr -= 1;
+                }
+
+                /* When end of circular buffer reached, wrap around */
+                if (cp >= buf_end)
+                        cp -= N_TTY_BUF_SIZE;
+        }
+
+        if (nr == 0) {
+                tty->echo_pos = 0;
+                tty->echo_cnt = 0;
+                tty->echo_overrun = 0;
+        } else {
+                int num_processed = tty->echo_cnt - nr;
+                tty->echo_pos += num_processed;
+                tty->echo_pos &= N_TTY_BUF_SIZE - 1;
+                tty->echo_cnt = nr;
+                if (num_processed > 0)
+                        tty->echo_overrun = 0;
+        }
+
+        mutex_unlock(&tty->echo_lock);
+        mutex_unlock(&tty->output_lock);
+
+        if (tty->ops->flush_chars)
+                tty->ops->flush_chars(tty);
+}
+
+/**
+ *      add_echo_byte   -       add a byte to the echo buffer
+ *      @c: unicode byte to echo
+ *      @tty: terminal device
+ *
+ *      Add a character or operation byte to the echo buffer.
+ *
+ *      Should be called under the echo lock to protect the echo buffer.
+ */
+
+static void add_echo_byte(unsigned char c, struct tty_struct *tty)
+{
+        int     new_byte_pos;
+
+        if (tty->echo_cnt == N_TTY_BUF_SIZE) {
+                /* Circular buffer is already at capacity */
+                new_byte_pos = tty->echo_pos;
+
+                /*
+                 * Since the buffer start position needs to be advanced,
+                 * be sure to step by a whole operation byte group.
+                 */
+                if (tty->echo_buf[tty->echo_pos] == ECHO_OP_START) {
+                        if (tty->echo_buf[(tty->echo_pos + 1) &
+                                          (N_TTY_BUF_SIZE - 1)] ==
+                                                ECHO_OP_ERASE_TAB) {
+                                tty->echo_pos += 3;
+                                tty->echo_cnt -= 2;
+                        } else {
+                                tty->echo_pos += 2;
+                                tty->echo_cnt -= 1;
+                        }
+                } else {
+                        tty->echo_pos++;
+                }
+                tty->echo_pos &= N_TTY_BUF_SIZE - 1;
+
+                tty->echo_overrun = 1;
+        } else {
+                new_byte_pos = tty->echo_pos + tty->echo_cnt;
+                new_byte_pos &= N_TTY_BUF_SIZE - 1;
+                tty->echo_cnt++;
+        }
+
+        tty->echo_buf[new_byte_pos] = c;
+}
+
+/**
+ *      echo_move_back_col      -       add operation to move back a column
+ *      @tty: terminal device
+ *
+ *      Add an operation to the echo buffer to move back one column.
+ *
+ *      Locking: echo_lock to protect the echo buffer
+ */
+
+static void echo_move_back_col(struct tty_struct *tty)
+{
+        mutex_lock(&tty->echo_lock);
+
+        add_echo_byte(ECHO_OP_START, tty);
+        add_echo_byte(ECHO_OP_MOVE_BACK_COL, tty);
+
+        mutex_unlock(&tty->echo_lock);
+}
+
+/**
+ *      echo_set_canon_col      -       add operation to set the canon column
+ *      @tty: terminal device
+ *
+ *      Add an operation to the echo buffer to set the canon column
+ *      to the current column.
+ *
+ *      Locking: echo_lock to protect the echo buffer
+ */
+
+static void echo_set_canon_col(struct tty_struct *tty)
+{
+        mutex_lock(&tty->echo_lock);
+
+        add_echo_byte(ECHO_OP_START, tty);
+        add_echo_byte(ECHO_OP_SET_CANON_COL, tty);
+
+        mutex_unlock(&tty->echo_lock);
+}
+
+/**
+ *      echo_erase_tab  -       add operation to erase a tab
+ *      @num_chars: number of character columns already used
+ *      @after_tab: true if num_chars starts after a previous tab
+ *      @tty: terminal device
+ *
+ *      Add an operation to the echo buffer to erase a tab.
+ *
+ *      Called by the eraser function, which knows how many character
+ *      columns have been used since either a previous tab or the start
+ *      of input.  This information will be used later, along with
+ *      canon column (if applicable), to go back the correct number
+ *      of columns.
+ *
+ *      Locking: echo_lock to protect the echo buffer
+ */
+
+static void echo_erase_tab(unsigned int num_chars, int after_tab,
+                           struct tty_struct *tty)
+{
+        mutex_lock(&tty->echo_lock);
+
+        add_echo_byte(ECHO_OP_START, tty);
+        add_echo_byte(ECHO_OP_ERASE_TAB, tty);
+
+        /* We only need to know this modulo 8 (tab spacing) */
+        num_chars &= 7;
+
+        /* Set the high bit as a flag if num_chars is after a previous tab */
+        if (after_tab)
+                num_chars |= 0x80;
+
+        add_echo_byte(num_chars, tty);
+
+        mutex_unlock(&tty->echo_lock);
+}
+
+/**
+ *      echo_char_raw   -       echo a character raw
+ *      @c: unicode byte to echo
+ *      @tty: terminal device
+ *
+ *      Echo user input back onto the screen. This must be called only when
+ *      L_ECHO(tty) is true. Called from the driver receive_buf path.
+ *
+ *      This variant does not treat control characters specially.
+ *
+ *      Locking: echo_lock to protect the echo buffer
+ */
+
+static void echo_char_raw(unsigned char c, struct tty_struct *tty)
+{
+        mutex_lock(&tty->echo_lock);
+
+        if (c == ECHO_OP_START) {
+                add_echo_byte(ECHO_OP_START, tty);
+                add_echo_byte(ECHO_OP_START, tty);
+        } else {
+                add_echo_byte(c, tty);
+        }
+
+        mutex_unlock(&tty->echo_lock);
+}
+
+/**
+ *      echo_char       -       echo a character
+ *      @c: unicode byte to echo
+ *      @tty: terminal device
+ *
+ *      Echo user input back onto the screen. This must be called only when
+ *      L_ECHO(tty) is true. Called from the driver receive_buf path.
+ *
+ *      This variant tags control characters to be echoed as "^X"
+ *      (where X is the letter representing the control char).
+ *
+ *      Locking: echo_lock to protect the echo buffer
+ */
+
+static void echo_char(unsigned char c, struct tty_struct *tty)
+{
+        mutex_lock(&tty->echo_lock);
+
+        if (c == ECHO_OP_START) {
+                add_echo_byte(ECHO_OP_START, tty);
+                add_echo_byte(ECHO_OP_START, tty);
+        } else {
+                if (L_ECHOCTL(tty) && iscntrl(c) && c != '\t')
+                        add_echo_byte(ECHO_OP_START, tty);
+                add_echo_byte(c, tty);
+        }
+
+        mutex_unlock(&tty->echo_lock);
+}
+
+/**
+ *      finish_erasing          -       complete erase
+ *      @tty: tty doing the erase
+ */
+
+static inline void finish_erasing(struct tty_struct *tty)
+{
+        if (tty->erasing) {
+                echo_char_raw('/', tty);
+                tty->erasing = 0;
+        }
+}
+
+/**
+ *      eraser          -       handle erase function
+ *      @c: character input
+ *      @tty: terminal device
+ *
+ *      Perform erase and necessary output when an erase character is
+ *      present in the stream from the driver layer. Handles the complexities
+ *      of UTF-8 multibyte symbols.
+ *
+ *      Locking: read_lock for tty buffers
+ */
+
+static void eraser(unsigned char c, struct tty_struct *tty)
+{
+        enum { ERASE, WERASE, KILL } kill_type;
+        int head, seen_alnums, cnt;
+        unsigned long flags;
+
+        /* FIXME: locking needed ? */
+        if (tty->read_head == tty->canon_head) {
+                /* process_output('\a', tty); */ /* what do you think? */
+                return;
+        }
+        if (c == ERASE_CHAR(tty))
+                kill_type = ERASE;
+        else if (c == WERASE_CHAR(tty))
+                kill_type = WERASE;
+        else {
+                if (!L_ECHO(tty)) {
+                        spin_lock_irqsave(&tty->read_lock, flags);
+                        tty->read_cnt -= ((tty->read_head - tty->canon_head) &
+                                          (N_TTY_BUF_SIZE - 1));
+                        tty->read_head = tty->canon_head;
+                        spin_unlock_irqrestore(&tty->read_lock, flags);
+                        return;
+                }
+                if (!L_ECHOK(tty) || !L_ECHOKE(tty) || !L_ECHOE(tty)) {
+                        spin_lock_irqsave(&tty->read_lock, flags);
+                        tty->read_cnt -= ((tty->read_head - tty->canon_head) &
+                                          (N_TTY_BUF_SIZE - 1));
+                        tty->read_head = tty->canon_head;
+                        spin_unlock_irqrestore(&tty->read_lock, flags);
+                        finish_erasing(tty);
+                        echo_char(KILL_CHAR(tty), tty);
+                        /* Add a newline if ECHOK is on and ECHOKE is off. */
+                        if (L_ECHOK(tty))
+                                echo_char_raw('\n', tty);
+                        return;
+                }
+                kill_type = KILL;
+        }
+
+        seen_alnums = 0;
+        /* FIXME: Locking ?? */
+        while (tty->read_head != tty->canon_head) {
+                head = tty->read_head;
+
+                /* erase a single possibly multibyte character */
+                do {
+                        head = (head - 1) & (N_TTY_BUF_SIZE-1);
+                        c = tty->read_buf[head];
+                } while (is_continuation(c, tty) && head != tty->canon_head);
+
+                /* do not partially erase */
+                if (is_continuation(c, tty))
+                        break;
+
+                if (kill_type == WERASE) {
+                        /* Equivalent to BSD's ALTWERASE. */
+                        if (isalnum(c) || c == '_')
+                                seen_alnums++;
+                        else if (seen_alnums)
+                                break;
+                }
+                cnt = (tty->read_head - head) & (N_TTY_BUF_SIZE-1);
+                spin_lock_irqsave(&tty->read_lock, flags);
+                tty->read_head = head;
+                tty->read_cnt -= cnt;
+                spin_unlock_irqrestore(&tty->read_lock, flags);
+                if (L_ECHO(tty)) {
+                        if (L_ECHOPRT(tty)) {
+                                if (!tty->erasing) {
+                                        echo_char_raw('\\', tty);
+                                        tty->erasing = 1;
+                                }
+                                /* if cnt > 1, output a multi-byte character */
+                                echo_char(c, tty);
+                                while (--cnt > 0) {
+                                        head = (head+1) & (N_TTY_BUF_SIZE-1);
+                                        echo_char_raw(tty->read_buf[head], tty);
+                                        echo_move_back_col(tty);
+                                }
+                        } else if (kill_type == ERASE && !L_ECHOE(tty)) {
+                                echo_char(ERASE_CHAR(tty), tty);
+                        } else if (c == '\t') {
+                                unsigned int num_chars = 0;
+                                int after_tab = 0;
+                                unsigned long tail = tty->read_head;
+
+                                /*
+                                 * Count the columns used for characters
+                                 * since the start of input or after a
+                                 * previous tab.
+                                 * This info is used to go back the correct
+                                 * number of columns.
+                                 */
+                                while (tail != tty->canon_head) {
+                                        tail = (tail-1) & (N_TTY_BUF_SIZE-1);
+                                        c = tty->read_buf[tail];
+                                        if (c == '\t') {
+                                                after_tab = 1;
+                                                break;
+                                        } else if (iscntrl(c)) {
+                                                if (L_ECHOCTL(tty))
+                                                        num_chars += 2;
+                                        } else if (!is_continuation(c, tty)) {
+                                                num_chars++;
+                                        }
+                                }
+                                echo_erase_tab(num_chars, after_tab, tty);
+                        } else {
+                                if (iscntrl(c) && L_ECHOCTL(tty)) {
+                                        echo_char_raw('\b', tty);
+                                        echo_char_raw(' ', tty);
+                                        echo_char_raw('\b', tty);
+                                }
+                                if (!iscntrl(c) || L_ECHOCTL(tty)) {
+                                        echo_char_raw('\b', tty);
+                                        echo_char_raw(' ', tty);
+                                        echo_char_raw('\b', tty);
+                                }
+                        }
+                }
+                if (kill_type == ERASE)
+                        break;
+        }
+        if (tty->read_head == tty->canon_head && L_ECHO(tty))
+                finish_erasing(tty);
+}
+
+/**
+ *      isig            -       handle the ISIG optio
+ *      @sig: signal
+ *      @tty: terminal
+ *      @flush: force flush
+ *
+ *      Called when a signal is being sent due to terminal input. This
+ *      may caus terminal flushing to take place according to the termios
+ *      settings and character used. Called from the driver receive_buf
+ *      path so serialized.
+ *
+ *      Locking: ctrl_lock, read_lock (both via flush buffer)
+ */
+
+static inline void isig(int sig, struct tty_struct *tty, int flush)
+{
+        if (tty->pgrp)
+                kill_pgrp(tty->pgrp, sig, 1);
+        if (flush || !L_NOFLSH(tty)) {
+                n_tty_flush_buffer(tty);
+                tty_driver_flush_buffer(tty);
+        }
+}
+
+/**
+ *      n_tty_receive_break     -       handle break
+ *      @tty: terminal
+ *
+ *      An RS232 break event has been hit in the incoming bitstream. This
+ *      can cause a variety of events depending upon the termios settings.
+ *
+ *      Called from the receive_buf path so single threaded.
+ */
+
+static inline void n_tty_receive_break(struct tty_struct *tty)
+{
+        if (I_IGNBRK(tty))
+                return;
+        if (I_BRKINT(tty)) {
+                isig(SIGINT, tty, 1);
+                return;
+        }
+        if (I_PARMRK(tty)) {
+                put_tty_queue('\377', tty);
+                put_tty_queue('\0', tty);
+        }
+        put_tty_queue('\0', tty);
+        wake_up_interruptible(&tty->read_wait);
+}
+
+/**
+ *      n_tty_receive_overrun   -       handle overrun reporting
+ *      @tty: terminal
+ *
+ *      Data arrived faster than we could process it. While the tty
+ *      driver has flagged this the bits that were missed are gone
+ *      forever.
+ *
+ *      Called from the receive_buf path so single threaded. Does not
+ *      need locking as num_overrun and overrun_time are function
+ *      private.
+ */
+
+static inline void n_tty_receive_overrun(struct tty_struct *tty)
+{
+        char buf[64];
+
+        tty->num_overrun++;
+        if (time_before(tty->overrun_time, jiffies - HZ) ||
+                        time_after(tty->overrun_time, jiffies)) {
+                printk(KERN_WARNING "%s: %d input overrun(s)\n",
+                        tty_name(tty, buf),
+                        tty->num_overrun);
+                tty->overrun_time = jiffies;
+                tty->num_overrun = 0;
+        }
+}
+
+/**
+ *      n_tty_receive_parity_error      -       error notifier
+ *      @tty: terminal device
+ *      @c: character
+ *
+ *      Process a parity error and queue the right data to indicate
+ *      the error case if necessary. Locking as per n_tty_receive_buf.
+ */
+static inline void n_tty_receive_parity_error(struct tty_struct *tty,
+                                              unsigned char c)
+{
+        if (I_IGNPAR(tty))
+                return;
+        if (I_PARMRK(tty)) {
+                put_tty_queue('\377', tty);
+                put_tty_queue('\0', tty);
+                put_tty_queue(c, tty);
+        } else  if (I_INPCK(tty))
+                put_tty_queue('\0', tty);
+        else
+                put_tty_queue(c, tty);
+        wake_up_interruptible(&tty->read_wait);
+}
+
+/**
+ *      n_tty_receive_char      -       perform processing
+ *      @tty: terminal device
+ *      @c: character
+ *
+ *      Process an individual character of input received from the driver.
+ *      This is serialized with respect to itself by the rules for the
+ *      driver above.
+ */
+
+static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
+{
+        unsigned long flags;
+        int parmrk;
+
+        if (tty->raw) {
+                put_tty_queue(c, tty);
+                return;
+        }
+
+        if (I_ISTRIP(tty))
+                c &= 0x7f;
+        if (I_IUCLC(tty) && L_IEXTEN(tty))
+                c = tolower(c);
+
+        if (L_EXTPROC(tty)) {
+                put_tty_queue(c, tty);
+                return;
+        }
+
+        if (tty->stopped && !tty->flow_stopped && I_IXON(tty) &&
+            I_IXANY(tty) && c != START_CHAR(tty) && c != STOP_CHAR(tty) &&
+            c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) && c != SUSP_CHAR(tty)) {
+                start_tty(tty);
+                process_echoes(tty);
+        }
+
+        if (tty->closing) {
+                if (I_IXON(tty)) {
+                        if (c == START_CHAR(tty)) {
+                                start_tty(tty);
+                                process_echoes(tty);
+                        } else if (c == STOP_CHAR(tty))
+                                stop_tty(tty);
+                }
+                return;
+        }
+
+        /*
+         * If the previous character was LNEXT, or we know that this
+         * character is not one of the characters that we'll have to
+         * handle specially, do shortcut processing to speed things
+         * up.
+         */
+        if (!test_bit(c, tty->process_char_map) || tty->lnext) {
+                tty->lnext = 0;
+                parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
+                if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
+                        /* beep if no space */
+                        if (L_ECHO(tty))
+                                process_output('\a', tty);
+                        return;
+                }
+                if (L_ECHO(tty)) {
+                        finish_erasing(tty);
+                        /* Record the column of first canon char. */
+                        if (tty->canon_head == tty->read_head)
+                                echo_set_canon_col(tty);
+                        echo_char(c, tty);
+                        process_echoes(tty);
+                }
+                if (parmrk)
+                        put_tty_queue(c, tty);
+                put_tty_queue(c, tty);
+                return;
+        }
+
+        if (I_IXON(tty)) {
+                if (c == START_CHAR(tty)) {
+                        start_tty(tty);
+                        process_echoes(tty);
+                        return;
+                }
+                if (c == STOP_CHAR(tty)) {
+                        stop_tty(tty);
+                        return;
+                }
+        }
+
+        if (L_ISIG(tty)) {
+                int signal;
+                signal = SIGINT;
+                if (c == INTR_CHAR(tty))
+                        goto send_signal;
+                signal = SIGQUIT;
+                if (c == QUIT_CHAR(tty))
+                        goto send_signal;
+                signal = SIGTSTP;
+                if (c == SUSP_CHAR(tty)) {
+send_signal:
+                        /*
+                         * Note that we do not use isig() here because we want
+                         * the order to be:
+                         * 1) flush, 2) echo, 3) signal
+                         */
+                        if (!L_NOFLSH(tty)) {
+                                n_tty_flush_buffer(tty);
+                                tty_driver_flush_buffer(tty);
+                        }
+                        if (I_IXON(tty))
+                                start_tty(tty);
+                        if (L_ECHO(tty)) {
+                                echo_char(c, tty);
+                                process_echoes(tty);
+                        }
+                        if (tty->pgrp)
+                                kill_pgrp(tty->pgrp, signal, 1);
+                        return;
+                }
+        }
+
+        if (c == '\r') {
+                if (I_IGNCR(tty))
+                        return;
+                if (I_ICRNL(tty))
+                        c = '\n';
+        } else if (c == '\n' && I_INLCR(tty))
+                c = '\r';
+
+        if (tty->icanon) {
+                if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) ||
+                    (c == WERASE_CHAR(tty) && L_IEXTEN(tty))) {
+                        eraser(c, tty);
+                        process_echoes(tty);
+                        return;
+                }
+                if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) {
+                        tty->lnext = 1;
+                        if (L_ECHO(tty)) {
+                                finish_erasing(tty);
+                                if (L_ECHOCTL(tty)) {
+                                        echo_char_raw('^', tty);
+                                        echo_char_raw('\b', tty);
+                                        process_echoes(tty);
+                                }
+                        }
+                        return;
+                }
+                if (c == REPRINT_CHAR(tty) && L_ECHO(tty) &&
+                    L_IEXTEN(tty)) {
+                        unsigned long tail = tty->canon_head;
+
+                        finish_erasing(tty);
+                        echo_char(c, tty);
+                        echo_char_raw('\n', tty);
+                        while (tail != tty->read_head) {
+                                echo_char(tty->read_buf[tail], tty);
+                                tail = (tail+1) & (N_TTY_BUF_SIZE-1);
+                        }
+                        process_echoes(tty);
+                        return;
+                }
+                if (c == '\n') {
+                        if (tty->read_cnt >= N_TTY_BUF_SIZE) {
+                                if (L_ECHO(tty))
+                                        process_output('\a', tty);
+                                return;
+                        }
+                        if (L_ECHO(tty) || L_ECHONL(tty)) {
+                                echo_char_raw('\n', tty);
+                                process_echoes(tty);
+                        }
+                        goto handle_newline;
+                }
+                if (c == EOF_CHAR(tty)) {
+                        if (tty->read_cnt >= N_TTY_BUF_SIZE)
+                                return;
+                        if (tty->canon_head != tty->read_head)
+                                set_bit(TTY_PUSH, &tty->flags);
+                        c = __DISABLED_CHAR;
+                        goto handle_newline;
+                }
+                if ((c == EOL_CHAR(tty)) ||
+                    (c == EOL2_CHAR(tty) && L_IEXTEN(tty))) {
+                        parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty))
+                                 ? 1 : 0;
+                        if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk)) {
+                                if (L_ECHO(tty))
+                                        process_output('\a', tty);
+                                return;
+                        }
+                        /*
+                         * XXX are EOL_CHAR and EOL2_CHAR echoed?!?
+                         */
+                        if (L_ECHO(tty)) {
+                                /* Record the column of first canon char. */
+                                if (tty->canon_head == tty->read_head)
+                                        echo_set_canon_col(tty);
+                                echo_char(c, tty);
+                                process_echoes(tty);
+                        }
+                        /*
+                         * XXX does PARMRK doubling happen for
+                         * EOL_CHAR and EOL2_CHAR?
+                         */
+                        if (parmrk)
+                                put_tty_queue(c, tty);
+
+handle_newline:
+                        spin_lock_irqsave(&tty->read_lock, flags);
+                        set_bit(tty->read_head, tty->read_flags);
+                        put_tty_queue_nolock(c, tty);
+                        tty->canon_head = tty->read_head;
+                        tty->canon_data++;
+                        spin_unlock_irqrestore(&tty->read_lock, flags);
+                        kill_fasync(&tty->fasync, SIGIO, POLL_IN);
+                        if (waitqueue_active(&tty->read_wait))
+                                wake_up_interruptible(&tty->read_wait);
+                        return;
+                }
+        }
+
+        parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
+        if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
+                /* beep if no space */
+                if (L_ECHO(tty))
+                        process_output('\a', tty);
+                return;
+        }
+        if (L_ECHO(tty)) {
+                finish_erasing(tty);
+                if (c == '\n')
+                        echo_char_raw('\n', tty);
+                else {
+                        /* Record the column of first canon char. */
+                        if (tty->canon_head == tty->read_head)
+                                echo_set_canon_col(tty);
+                        echo_char(c, tty);
+                }
+                process_echoes(tty);
+        }
+
+        if (parmrk)
+                put_tty_queue(c, tty);
+
+        put_tty_queue(c, tty);
+}
+
+
+/**
+ *      n_tty_write_wakeup      -       asynchronous I/O notifier
+ *      @tty: tty device
+ *
+ *      Required for the ptys, serial driver etc. since processes
+ *      that attach themselves to the master and rely on ASYNC
+ *      IO must be woken up
+ */
+
+static void n_tty_write_wakeup(struct tty_struct *tty)
+{
+        if (tty->fasync && test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags))
+                kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
+}
+
+/**
+ *      n_tty_receive_buf       -       data receive
+ *      @tty: terminal device
+ *      @cp: buffer
+ *      @fp: flag buffer
+ *      @count: characters
+ *
+ *      Called by the terminal driver when a block of characters has
+ *      been received. This function must be called from soft contexts
+ *      not from interrupt context. The driver is responsible for making
+ *      calls one at a time and in order (or using flush_to_ldisc)
+ */
+
+static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+                              char *fp, int count)
+{
+        const unsigned char *p;
+        char *f, flags = TTY_NORMAL;
+        int     i;
+        char    buf[64];
+        unsigned long cpuflags;
+
+        if (!tty->read_buf)
+                return;
+
+        if (tty->real_raw) {
+                spin_lock_irqsave(&tty->read_lock, cpuflags);
+                i = min(N_TTY_BUF_SIZE - tty->read_cnt,
+                        N_TTY_BUF_SIZE - tty->read_head);
+                i = min(count, i);
+                memcpy(tty->read_buf + tty->read_head, cp, i);
+                tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1);
+                tty->read_cnt += i;
+                cp += i;
+                count -= i;
+
+                i = min(N_TTY_BUF_SIZE - tty->read_cnt,
+                        N_TTY_BUF_SIZE - tty->read_head);
+                i = min(count, i);
+                memcpy(tty->read_buf + tty->read_head, cp, i);
+                tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1);
+                tty->read_cnt += i;
+                spin_unlock_irqrestore(&tty->read_lock, cpuflags);
+        } else {
+                for (i = count, p = cp, f = fp; i; i--, p++) {
+                        if (f)
+                                flags = *f++;
+                        switch (flags) {
+                        case TTY_NORMAL:
+                                n_tty_receive_char(tty, *p);
+                                break;
+                        case TTY_BREAK:
+                                n_tty_receive_break(tty);
+                                break;
+                        case TTY_PARITY:
+                        case TTY_FRAME:
+                                n_tty_receive_parity_error(tty, *p);
+                                break;
+                        case TTY_OVERRUN:
+                                n_tty_receive_overrun(tty);
+                                break;
+                        default:
+                                printk(KERN_ERR "%s: unknown flag %d\n",
+                                       tty_name(tty, buf), flags);
+                                break;
+                        }
+                }
+                if (tty->ops->flush_chars)
+                        tty->ops->flush_chars(tty);
+        }
+
+        n_tty_set_room(tty);
+
+        if ((!tty->icanon && (tty->read_cnt >= tty->minimum_to_wake)) ||
+                L_EXTPROC(tty)) {
+                kill_fasync(&tty->fasync, SIGIO, POLL_IN);
+                if (waitqueue_active(&tty->read_wait))
+                        wake_up_interruptible(&tty->read_wait);
+        }
+
+        /*
+         * Check the remaining room for the input canonicalization
+         * mode.  We don't want to throttle the driver if we're in
+         * canonical mode and don't have a newline yet!
+         */
+        if (tty->receive_room < TTY_THRESHOLD_THROTTLE)
+                tty_throttle(tty);
+}
+
+int is_ignored(int sig)
+{
+        return (sigismember(&current->blocked, sig) ||
+                current->sighand->action[sig-1].sa.sa_handler == SIG_IGN);
+}
+
+/**
+ *      n_tty_set_termios       -       termios data changed
+ *      @tty: terminal
+ *      @old: previous data
+ *
+ *      Called by the tty layer when the user changes termios flags so
+ *      that the line discipline can plan ahead. This function cannot sleep
+ *      and is protected from re-entry by the tty layer. The user is
+ *      guaranteed that this function will not be re-entered or in progress
+ *      when the ldisc is closed.
+ *
+ *      Locking: Caller holds tty->termios_mutex
+ */
+
+static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+        int canon_change = 1;
+        BUG_ON(!tty);
+
+        if (old)
+                canon_change = (old->c_lflag ^ tty->termios->c_lflag) & ICANON;
+        if (canon_change) {
+                memset(&tty->read_flags, 0, sizeof tty->read_flags);
+                tty->canon_head = tty->read_tail;
+                tty->canon_data = 0;
+                tty->erasing = 0;
+        }
+
+        if (canon_change && !L_ICANON(tty) && tty->read_cnt)
+                wake_up_interruptible(&tty->read_wait);
+
+        tty->icanon = (L_ICANON(tty) != 0);
+        if (test_bit(TTY_HW_COOK_IN, &tty->flags)) {
+                tty->raw = 1;
+                tty->real_raw = 1;
+                n_tty_set_room(tty);
+                return;
+        }
+        if (I_ISTRIP(tty) || I_IUCLC(tty) || I_IGNCR(tty) ||
+            I_ICRNL(tty) || I_INLCR(tty) || L_ICANON(tty) ||
+            I_IXON(tty) || L_ISIG(tty) || L_ECHO(tty) ||
+            I_PARMRK(tty)) {
+                memset(tty->process_char_map, 0, 256/8);
+
+                if (I_IGNCR(tty) || I_ICRNL(tty))
+                        set_bit('\r', tty->process_char_map);
+                if (I_INLCR(tty))
+                        set_bit('\n', tty->process_char_map);
+
+                if (L_ICANON(tty)) {
+                        set_bit(ERASE_CHAR(tty), tty->process_char_map);
+                        set_bit(KILL_CHAR(tty), tty->process_char_map);
+                        set_bit(EOF_CHAR(tty), tty->process_char_map);
+                        set_bit('\n', tty->process_char_map);
+                        set_bit(EOL_CHAR(tty), tty->process_char_map);
+                        if (L_IEXTEN(tty)) {
+                                set_bit(WERASE_CHAR(tty),
+                                        tty->process_char_map);
+                                set_bit(LNEXT_CHAR(tty),
+                                        tty->process_char_map);
+                                set_bit(EOL2_CHAR(tty),
+                                        tty->process_char_map);
+                                if (L_ECHO(tty))
+                                        set_bit(REPRINT_CHAR(tty),
+                                                tty->process_char_map);
+                        }
+                }
+                if (I_IXON(tty)) {
+                        set_bit(START_CHAR(tty), tty->process_char_map);
+                        set_bit(STOP_CHAR(tty), tty->process_char_map);
+                }
+                if (L_ISIG(tty)) {
+                        set_bit(INTR_CHAR(tty), tty->process_char_map);
+                        set_bit(QUIT_CHAR(tty), tty->process_char_map);
+                        set_bit(SUSP_CHAR(tty), tty->process_char_map);
+                }
+                clear_bit(__DISABLED_CHAR, tty->process_char_map);
+                tty->raw = 0;
+                tty->real_raw = 0;
+        } else {
+                tty->raw = 1;
+                if ((I_IGNBRK(tty) || (!I_BRKINT(tty) && !I_PARMRK(tty))) &&
+                    (I_IGNPAR(tty) || !I_INPCK(tty)) &&
+                    (tty->driver->flags & TTY_DRIVER_REAL_RAW))
+                        tty->real_raw = 1;
+                else
+                        tty->real_raw = 0;
+        }
+        n_tty_set_room(tty);
+        /* The termios change make the tty ready for I/O */
+        wake_up_interruptible(&tty->write_wait);
+        wake_up_interruptible(&tty->read_wait);
+}
+
+/**
+ *      n_tty_close             -       close the ldisc for this tty
+ *      @tty: device
+ *
+ *      Called from the terminal layer when this line discipline is
+ *      being shut down, either because of a close or becsuse of a
+ *      discipline change. The function will not be called while other
+ *      ldisc methods are in progress.
+ */
+
+static void n_tty_close(struct tty_struct *tty)
+{
+        n_tty_flush_buffer(tty);
+        if (tty->read_buf) {
+                kfree(tty->read_buf);
+                tty->read_buf = NULL;
+        }
+        if (tty->echo_buf) {
+                kfree(tty->echo_buf);
+                tty->echo_buf = NULL;
+        }
+}
+
+/**
+ *      n_tty_open              -       open an ldisc
+ *      @tty: terminal to open
+ *
+ *      Called when this line discipline is being attached to the
+ *      terminal device. Can sleep. Called serialized so that no
+ *      other events will occur in parallel. No further open will occur
+ *      until a close.
+ */
+
+static int n_tty_open(struct tty_struct *tty)
+{
+        if (!tty)
+                return -EINVAL;
+
+        /* These are ugly. Currently a malloc failure here can panic */
+        if (!tty->read_buf) {
+                tty->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
+                if (!tty->read_buf)
+                        return -ENOMEM;
+        }
+        if (!tty->echo_buf) {
+                tty->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
+
+                if (!tty->echo_buf)
+                        return -ENOMEM;
+        }
+        reset_buffer_flags(tty);
+        tty->column = 0;
+        n_tty_set_termios(tty, NULL);
+        tty->minimum_to_wake = 1;
+        tty->closing = 0;
+        return 0;
+}
+
+static inline int input_available_p(struct tty_struct *tty, int amt)
+{
+        tty_flush_to_ldisc(tty);
+        if (tty->icanon && !L_EXTPROC(tty)) {
+                if (tty->canon_data)
+                        return 1;
+        } else if (tty->read_cnt >= (amt ? amt : 1))
+                return 1;
+
+        return 0;
+}
+
+/**
+ *      copy_from_read_buf      -       copy read data directly
+ *      @tty: terminal device
+ *      @b: user data
+ *      @nr: size of data
+ *
+ *      Helper function to speed up n_tty_read.  It is only called when
+ *      ICANON is off; it copies characters straight from the tty queue to
+ *      user space directly.  It can be profitably called twice; once to
+ *      drain the space from the tail pointer to the (physical) end of the
+ *      buffer, and once to drain the space from the (physical) beginning of
+ *      the buffer to head pointer.
+ *
+ *      Called under the tty->atomic_read_lock sem
+ *
+ */
+
+static int copy_from_read_buf(struct tty_struct *tty,
+                                      unsigned char __user **b,
+                                      size_t *nr)
+
+{
+        int retval;
+        size_t n;
+        unsigned long flags;
+
+        retval = 0;
+        spin_lock_irqsave(&tty->read_lock, flags);
+        n = min(tty->read_cnt, N_TTY_BUF_SIZE - tty->read_tail);
+        n = min(*nr, n);
+        spin_unlock_irqrestore(&tty->read_lock, flags);
+        if (n) {
+                retval = copy_to_user(*b, &tty->read_buf[tty->read_tail], n);
+                n -= retval;
+                tty_audit_add_data(tty, &tty->read_buf[tty->read_tail], n);
+                spin_lock_irqsave(&tty->read_lock, flags);
+                tty->read_tail = (tty->read_tail + n) & (N_TTY_BUF_SIZE-1);
+                tty->read_cnt -= n;
+                /* Turn single EOF into zero-length read */
+                if (L_EXTPROC(tty) && tty->icanon && n == 1) {
+                        if (!tty->read_cnt && (*b)[n-1] == EOF_CHAR(tty))
+                                n--;
+                }
+                spin_unlock_irqrestore(&tty->read_lock, flags);
+                *b += n;
+                *nr -= n;
+        }
+        return retval;
+}
+
+extern ssize_t redirected_tty_write(struct file *, const char __user *,
+                                                        size_t, loff_t *);
+
+/**
+ *      job_control             -       check job control
+ *      @tty: tty
+ *      @file: file handle
+ *
+ *      Perform job control management checks on this file/tty descriptor
+ *      and if appropriate send any needed signals and return a negative
+ *      error code if action should be taken.
+ *
+ *      FIXME:
+ *      Locking: None - redirected write test is safe, testing
+ *      current->signal should possibly lock current->sighand
+ *      pgrp locking ?
+ */
+
+static int job_control(struct tty_struct *tty, struct file *file)
+{
+        /* Job control check -- must be done at start and after
+           every sleep (POSIX.1 7.1.1.4). */
+        /* NOTE: not yet done after every sleep pending a thorough
+           check of the logic of this change. -- jlc */
+        /* don't stop on /dev/console */
+        if (file->f_op->write != redirected_tty_write &&
+            current->signal->tty == tty) {
+                if (!tty->pgrp)
+                        printk(KERN_ERR "n_tty_read: no tty->pgrp!\n");
+                else if (task_pgrp(current) != tty->pgrp) {
+                        if (is_ignored(SIGTTIN) ||
+                            is_current_pgrp_orphaned())
+                                return -EIO;
+                        kill_pgrp(task_pgrp(current), SIGTTIN, 1);
+                        set_thread_flag(TIF_SIGPENDING);
+                        return -ERESTARTSYS;
+                }
+        }
+        return 0;
+}
+
+
+/**
+ *      n_tty_read              -       read function for tty
+ *      @tty: tty device
+ *      @file: file object
+ *      @buf: userspace buffer pointer
+ *      @nr: size of I/O
+ *
+ *      Perform reads for the line discipline. We are guaranteed that the
+ *      line discipline will not be closed under us but we may get multiple
+ *      parallel readers and must handle this ourselves. We may also get
+ *      a hangup. Always called in user context, may sleep.
+ *
+ *      This code must be sure never to sleep through a hangup.
+ */
+
+static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
+                         unsigned char __user *buf, size_t nr)
+{
+        unsigned char __user *b = buf;
+        DECLARE_WAITQUEUE(wait, current);
+        int c;
+        int minimum, time;
+        ssize_t retval = 0;
+        ssize_t size;
+        long timeout;
+        unsigned long flags;
+        int packet;
+
+do_it_again:
+
+        BUG_ON(!tty->read_buf);
+
+        c = job_control(tty, file);
+        if (c < 0)
+                return c;
+
+        minimum = time = 0;
+        timeout = MAX_SCHEDULE_TIMEOUT;
+        if (!tty->icanon) {
+                time = (HZ / 10) * TIME_CHAR(tty);
+                minimum = MIN_CHAR(tty);
+                if (minimum) {
+                        if (time)
+                                tty->minimum_to_wake = 1;
+                        else if (!waitqueue_active(&tty->read_wait) ||
+                                 (tty->minimum_to_wake > minimum))
+                                tty->minimum_to_wake = minimum;
+                } else {
+                        timeout = 0;
+                        if (time) {
+                                timeout = time;
+                                time = 0;
+                        }
+                        tty->minimum_to_wake = minimum = 1;
+                }
+        }
+
+        /*
+         *      Internal serialization of reads.
+         */
+        if (file->f_flags & O_NONBLOCK) {
+                if (!mutex_trylock(&tty->atomic_read_lock))
+                        return -EAGAIN;
+        } else {
+                if (mutex_lock_interruptible(&tty->atomic_read_lock))
+                        return -ERESTARTSYS;
+        }
+        packet = tty->packet;
+
+        add_wait_queue(&tty->read_wait, &wait);
+        while (nr) {
+                /* First test for status change. */
+                if (packet && tty->link->ctrl_status) {
+                        unsigned char cs;
+                        if (b != buf)
+                                break;
+                        spin_lock_irqsave(&tty->link->ctrl_lock, flags);
+                        cs = tty->link->ctrl_status;
+                        tty->link->ctrl_status = 0;
+                        spin_unlock_irqrestore(&tty->link->ctrl_lock, flags);
+                        if (tty_put_user(tty, cs, b++)) {
+                                retval = -EFAULT;
+                                b--;
+                                break;
+                        }
+                        nr--;
+                        break;
+                }
+                /* This statement must be first before checking for input
+                   so that any interrupt will set the state back to
+                   TASK_RUNNING. */
+                set_current_state(TASK_INTERRUPTIBLE);
+
+                if (((minimum - (b - buf)) < tty->minimum_to_wake) &&
+                    ((minimum - (b - buf)) >= 1))
+                        tty->minimum_to_wake = (minimum - (b - buf));
+
+                if (!input_available_p(tty, 0)) {
+                        if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) {
+                                retval = -EIO;
+                                break;
+                        }
+                        if (tty_hung_up_p(file))
+                                break;
+                        if (!timeout)
+                                break;
+                        if (file->f_flags & O_NONBLOCK) {
+                                retval = -EAGAIN;
+                                break;
+                        }
+                        if (signal_pending(current)) {
+                                retval = -ERESTARTSYS;
+                                break;
+                        }
+                        /* FIXME: does n_tty_set_room need locking ? */
+                        n_tty_set_room(tty);
+                        timeout = schedule_timeout(timeout);
+                        BUG_ON(!tty->read_buf);
+                        continue;
+                }
+                __set_current_state(TASK_RUNNING);
+
+                /* Deal with packet mode. */
+                if (packet && b == buf) {
+                        if (tty_put_user(tty, TIOCPKT_DATA, b++)) {
+                                retval = -EFAULT;
+                                b--;
+                                break;
+                        }
+                        nr--;
+                }
+
+                if (tty->icanon && !L_EXTPROC(tty)) {
+                        /* N.B. avoid overrun if nr == 0 */
+                        while (nr && tty->read_cnt) {
+                                int eol;
+
+                                eol = test_and_clear_bit(tty->read_tail,
+                                                tty->read_flags);
+                                c = tty->read_buf[tty->read_tail];
+                                spin_lock_irqsave(&tty->read_lock, flags);
+                                tty->read_tail = ((tty->read_tail+1) &
+                                                  (N_TTY_BUF_SIZE-1));
+                                tty->read_cnt--;
+                                if (eol) {
+                                        /* this test should be redundant:
+                                         * we shouldn't be reading data if
+                                         * canon_data is 0
+                                         */
+                                        if (--tty->canon_data < 0)
+                                                tty->canon_data = 0;
+                                }
+                                spin_unlock_irqrestore(&tty->read_lock, flags);
+
+                                if (!eol || (c != __DISABLED_CHAR)) {
+                                        if (tty_put_user(tty, c, b++)) {
+                                                retval = -EFAULT;
+                                                b--;
+                                                break;
+                                        }
+                                        nr--;
+                                }
+                                if (eol) {
+                                        tty_audit_push(tty);
+                                        break;
+                                }
+                        }
+                        if (retval)
+                                break;
+                } else {
+                        int uncopied;
+                        /* The copy function takes the read lock and handles
+                           locking internally for this case */
+                        uncopied = copy_from_read_buf(tty, &b, &nr);
+                        uncopied += copy_from_read_buf(tty, &b, &nr);
+                        if (uncopied) {
+                                retval = -EFAULT;
+                                break;
+                        }
+                }
+
+                /* If there is enough space in the read buffer now, let the
+                 * low-level driver know. We use n_tty_chars_in_buffer() to
+                 * check the buffer, as it now knows about canonical mode.
+                 * Otherwise, if the driver is throttled and the line is
+                 * longer than TTY_THRESHOLD_UNTHROTTLE in canonical mode,
+                 * we won't get any more characters.
+                 */
+                if (n_tty_chars_in_buffer(tty) <= TTY_THRESHOLD_UNTHROTTLE) {
+                        n_tty_set_room(tty);
+                        check_unthrottle(tty);
+                }
+
+                if (b - buf >= minimum)
+                        break;
+                if (time)
+                        timeout = time;
+        }
+        mutex_unlock(&tty->atomic_read_lock);
+        remove_wait_queue(&tty->read_wait, &wait);
+
+        if (!waitqueue_active(&tty->read_wait))
+                tty->minimum_to_wake = minimum;
+
+        __set_current_state(TASK_RUNNING);
+        size = b - buf;
+        if (size) {
+                retval = size;
+                if (nr)
+                        clear_bit(TTY_PUSH, &tty->flags);
+        } else if (test_and_clear_bit(TTY_PUSH, &tty->flags))
+                 goto do_it_again;
+
+        n_tty_set_room(tty);
+        return retval;
+}
+
+/**
+ *      n_tty_write             -       write function for tty
+ *      @tty: tty device
+ *      @file: file object
+ *      @buf: userspace buffer pointer
+ *      @nr: size of I/O
+ *
+ *      Write function of the terminal device.  This is serialized with
+ *      respect to other write callers but not to termios changes, reads
+ *      and other such events.  Since the receive code will echo characters,
+ *      thus calling driver write methods, the output_lock is used in
+ *      the output processing functions called here as well as in the
+ *      echo processing function to protect the column state and space
+ *      left in the buffer.
+ *
+ *      This code must be sure never to sleep through a hangup.
+ *
+ *      Locking: output_lock to protect column state and space left
+ *               (note that the process_output*() functions take this
+ *                lock themselves)
+ */
+
+static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
+                           const unsigned char *buf, size_t nr)
+{
+        const unsigned char *b = buf;
+        DECLARE_WAITQUEUE(wait, current);
+        int c;
+        ssize_t retval = 0;
+
+        /* Job control check -- must be done at start (POSIX.1 7.1.1.4). */
+        if (L_TOSTOP(tty) && file->f_op->write != redirected_tty_write) {
+                retval = tty_check_change(tty);
+                if (retval)
+                        return retval;
+        }
+
+        /* Write out any echoed characters that are still pending */
+        process_echoes(tty);
+
+        add_wait_queue(&tty->write_wait, &wait);
+        while (1) {
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+                if (tty_hung_up_p(file) || (tty->link && !tty->link->count)) {
+                        retval = -EIO;
+                        break;
+                }
+                if (O_OPOST(tty) && !(test_bit(TTY_HW_COOK_OUT, &tty->flags))) {
+                        while (nr > 0) {
+                                ssize_t num = process_output_block(tty, b, nr);
+                                if (num < 0) {
+                                        if (num == -EAGAIN)
+                                                break;
+                                        retval = num;
+                                        goto break_out;
+                                }
+                                b += num;
+                                nr -= num;
+                                if (nr == 0)
+                                        break;
+                                c = *b;
+                                if (process_output(c, tty) < 0)
+                                        break;
+                                b++; nr--;
+                        }
+                        if (tty->ops->flush_chars)
+                                tty->ops->flush_chars(tty);
+                } else {
+                        while (nr > 0) {
+                                c = tty->ops->write(tty, b, nr);
+                                if (c < 0) {
+                                        retval = c;
+                                        goto break_out;
+                                }
+                                if (!c)
+                                        break;
+                                b += c;
+                                nr -= c;
+                        }
+                }
+                if (!nr)
+                        break;
+                if (file->f_flags & O_NONBLOCK) {
+                        retval = -EAGAIN;
+                        break;
+                }
+                schedule();
+        }
+break_out:
+        __set_current_state(TASK_RUNNING);
+        remove_wait_queue(&tty->write_wait, &wait);
+        if (b - buf != nr && tty->fasync)
+                set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+        return (b - buf) ? b - buf : retval;
+}
+
+/**
+ *      n_tty_poll              -       poll method for N_TTY
+ *      @tty: terminal device
+ *      @file: file accessing it
+ *      @wait: poll table
+ *
+ *      Called when the line discipline is asked to poll() for data or
+ *      for special events. This code is not serialized with respect to
+ *      other events save open/close.
+ *
+ *      This code must be sure never to sleep through a hangup.
+ *      Called without the kernel lock held - fine
+ */
+
+static unsigned int n_tty_poll(struct tty_struct *tty, struct file *file,
+                                                        poll_table *wait)
+{
+        unsigned int mask = 0;
+
+        poll_wait(file, &tty->read_wait, wait);
+        poll_wait(file, &tty->write_wait, wait);
+        if (input_available_p(tty, TIME_CHAR(tty) ? 0 : MIN_CHAR(tty)))
+                mask |= POLLIN | POLLRDNORM;
+        if (tty->packet && tty->link->ctrl_status)
+                mask |= POLLPRI | POLLIN | POLLRDNORM;
+        if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
+                mask |= POLLHUP;
+        if (tty_hung_up_p(file))
+                mask |= POLLHUP;
+        if (!(mask & (POLLHUP | POLLIN | POLLRDNORM))) {
+                if (MIN_CHAR(tty) && !TIME_CHAR(tty))
+                        tty->minimum_to_wake = MIN_CHAR(tty);
+                else
+                        tty->minimum_to_wake = 1;
+        }
+        if (tty->ops->write && !tty_is_writelocked(tty) &&
+                        tty_chars_in_buffer(tty) < WAKEUP_CHARS &&
+                        tty_write_room(tty) > 0)
+                mask |= POLLOUT | POLLWRNORM;
+        return mask;
+}
+
+static unsigned long inq_canon(struct tty_struct *tty)
+{
+        int nr, head, tail;
+
+        if (!tty->canon_data)
+                return 0;
+        head = tty->canon_head;
+        tail = tty->read_tail;
+        nr = (head - tail) & (N_TTY_BUF_SIZE-1);
+        /* Skip EOF-chars.. */
+        while (head != tail) {
+                if (test_bit(tail, tty->read_flags) &&
+                    tty->read_buf[tail] == __DISABLED_CHAR)
+                        nr--;
+                tail = (tail+1) & (N_TTY_BUF_SIZE-1);
+        }
+        return nr;
+}
+
+static int n_tty_ioctl(struct tty_struct *tty, struct file *file,
+                       unsigned int cmd, unsigned long arg)
+{
+        int retval;
+
+        switch (cmd) {
+        case TIOCOUTQ:
+                return put_user(tty_chars_in_buffer(tty), (int __user *) arg);
+        case TIOCINQ:
+                /* FIXME: Locking */
+                retval = tty->read_cnt;
+                if (L_ICANON(tty))
+                        retval = inq_canon(tty);
+                return put_user(retval, (unsigned int __user *) arg);
+        default:
+                return n_tty_ioctl_helper(tty, file, cmd, arg);
+        }
+}
+
+struct tty_ldisc_ops tty_ldisc_N_TTY = {
+        .magic           = TTY_LDISC_MAGIC,
+        .name            = "n_tty",
+        .open            = n_tty_open,
+        .close           = n_tty_close,
+        .flush_buffer    = n_tty_flush_buffer,
+        .chars_in_buffer = n_tty_chars_in_buffer,
+        .read            = n_tty_read,
+        .write           = n_tty_write,
+        .ioctl           = n_tty_ioctl,
+        .set_termios     = n_tty_set_termios,
+        .poll            = n_tty_poll,
+        .receive_buf     = n_tty_receive_buf,
+        .write_wakeup    = n_tty_write_wakeup
+};
+
+/**
+ *      n_tty_inherit_ops       -       inherit N_TTY methods
+ *      @ops: struct tty_ldisc_ops where to save N_TTY methods
+ *
+ *      Used by a generic struct tty_ldisc_ops to easily inherit N_TTY
+ *      methods.
+ */
+
+void n_tty_inherit_ops(struct tty_ldisc_ops *ops)
+{
+        *ops = tty_ldisc_N_TTY;
+        ops->owner = NULL;
+        ops->refcount = ops->flags = 0;
+}
+EXPORT_SYMBOL_GPL(n_tty_inherit_ops);
diff --git a/drivers/tty/nozomi.c b/drivers/tty/nozomi.c
new file mode 100644
index 000000000000..fd347ff34d07
--- /dev/null
+++ b/drivers/tty/nozomi.c
@@ -0,0 +1,1971 @@
+/*
+ * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
+ *
+ * Written by: Ulf Jakobsson,
+ *             Jan Ã…kerfeldt,
+ *             Stefan Thomasson,
+ *
+ * Maintained by: Paul Hardwick (p.hardwick@option.com)
+ *
+ * Patches:
+ *          Locking code changes for Vodafone by Sphere Systems Ltd,
+ *                              Andrew Bird (ajb@spheresystems.co.uk )
+ *                              & Phil Sanderson
+ *
+ * Source has been ported from an implementation made by Filip Aben @ Option
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Copyright (c) 2005,2006 Option Wireless Sweden AB
+ * Copyright (c) 2006 Sphere Systems Ltd
+ * Copyright (c) 2006 Option Wireless n/v
+ * All rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * --------------------------------------------------------------------------
+ */
+
+/* Enable this to have a lot of debug printouts */
+#define DEBUG
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/sched.h>
+#include <linux/serial.h>
+#include <linux/interrupt.h>
+#include <linux/kmod.h>
+#include <linux/init.h>
+#include <linux/kfifo.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <asm/byteorder.h>
+
+#include <linux/delay.h>
+
+
+#define VERSION_STRING DRIVER_DESC " 2.1d"
+
+/*    Macros definitions */
+
+/* Default debug printout level */
+#define NOZOMI_DEBUG_LEVEL 0x00
+
+#define P_BUF_SIZE 128
+#define NFO(_err_flag_, args...)                                \
+do {                                                            \
+        char tmp[P_BUF_SIZE];                                   \
+        snprintf(tmp, sizeof(tmp), ##args);                     \
+        printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,          \
+                __func__, tmp);                         \
+} while (0)
+
+#define DBG1(args...) D_(0x01, ##args)
+#define DBG2(args...) D_(0x02, ##args)
+#define DBG3(args...) D_(0x04, ##args)
+#define DBG4(args...) D_(0x08, ##args)
+#define DBG5(args...) D_(0x10, ##args)
+#define DBG6(args...) D_(0x20, ##args)
+#define DBG7(args...) D_(0x40, ##args)
+#define DBG8(args...) D_(0x80, ##args)
+
+#ifdef DEBUG
+/* Do we need this settable at runtime? */
+static int debug = NOZOMI_DEBUG_LEVEL;
+
+#define D(lvl, args...)  do \
+                        {if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
+                        while (0)
+#define D_(lvl, args...) D(lvl, ##args)
+
+/* These printouts are always printed */
+
+#else
+static int debug;
+#define D_(lvl, args...)
+#endif
+
+/* TODO: rewrite to optimize macros... */
+
+#define TMP_BUF_MAX 256
+
+#define DUMP(buf__,len__) \
+  do {  \
+    char tbuf[TMP_BUF_MAX] = {0};\
+    if (len__ > 1) {\
+        snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
+        if (tbuf[len__-2] == '\r') {\
+                tbuf[len__-2] = 'r';\
+        } \
+        DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
+    } else {\
+        DBG1("SENDING: '%s' (%d)", tbuf, len__);\
+    } \
+} while (0)
+
+/*    Defines */
+#define NOZOMI_NAME             "nozomi"
+#define NOZOMI_NAME_TTY         "nozomi_tty"
+#define DRIVER_DESC             "Nozomi driver"
+
+#define NTTY_TTY_MAXMINORS      256
+#define NTTY_FIFO_BUFFER_SIZE   8192
+
+/* Must be power of 2 */
+#define FIFO_BUFFER_SIZE_UL     8192
+
+/* Size of tmp send buffer to card */
+#define SEND_BUF_MAX            1024
+#define RECEIVE_BUF_MAX         4
+
+
+#define R_IIR           0x0000  /* Interrupt Identity Register */
+#define R_FCR           0x0000  /* Flow Control Register */
+#define R_IER           0x0004  /* Interrupt Enable Register */
+
+#define CONFIG_MAGIC    0xEFEFFEFE
+#define TOGGLE_VALID    0x0000
+
+/* Definition of interrupt tokens */
+#define MDM_DL1         0x0001
+#define MDM_UL1         0x0002
+#define MDM_DL2         0x0004
+#define MDM_UL2         0x0008
+#define DIAG_DL1        0x0010
+#define DIAG_DL2        0x0020
+#define DIAG_UL         0x0040
+#define APP1_DL         0x0080
+#define APP1_UL         0x0100
+#define APP2_DL         0x0200
+#define APP2_UL         0x0400
+#define CTRL_DL         0x0800
+#define CTRL_UL         0x1000
+#define RESET           0x8000
+
+#define MDM_DL          (MDM_DL1  | MDM_DL2)
+#define MDM_UL          (MDM_UL1  | MDM_UL2)
+#define DIAG_DL         (DIAG_DL1 | DIAG_DL2)
+
+/* modem signal definition */
+#define CTRL_DSR        0x0001
+#define CTRL_DCD        0x0002
+#define CTRL_RI         0x0004
+#define CTRL_CTS        0x0008
+
+#define CTRL_DTR        0x0001
+#define CTRL_RTS        0x0002
+
+#define MAX_PORT                4
+#define NOZOMI_MAX_PORTS        5
+#define NOZOMI_MAX_CARDS        (NTTY_TTY_MAXMINORS / MAX_PORT)
+
+/*    Type definitions */
+
+/*
+ * There are two types of nozomi cards,
+ * one with 2048 memory and with 8192 memory
+ */
+enum card_type {
+        F32_2 = 2048,   /* 512 bytes downlink + uplink * 2 -> 2048 */
+        F32_8 = 8192,   /* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
+};
+
+/* Initialization states a card can be in */
+enum card_state {
+        NOZOMI_STATE_UKNOWN     = 0,
+        NOZOMI_STATE_ENABLED    = 1,    /* pci device enabled */
+        NOZOMI_STATE_ALLOCATED  = 2,    /* config setup done */
+        NOZOMI_STATE_READY      = 3,    /* flowcontrols received */
+};
+
+/* Two different toggle channels exist */
+enum channel_type {
+        CH_A = 0,
+        CH_B = 1,
+};
+
+/* Port definition for the card regarding flow control */
+enum ctrl_port_type {
+        CTRL_CMD        = 0,
+        CTRL_MDM        = 1,
+        CTRL_DIAG       = 2,
+        CTRL_APP1       = 3,
+        CTRL_APP2       = 4,
+        CTRL_ERROR      = -1,
+};
+
+/* Ports that the nozomi has */
+enum port_type {
+        PORT_MDM        = 0,
+        PORT_DIAG       = 1,
+        PORT_APP1       = 2,
+        PORT_APP2       = 3,
+        PORT_CTRL       = 4,
+        PORT_ERROR      = -1,
+};
+
+#ifdef __BIG_ENDIAN
+/* Big endian */
+
+struct toggles {
+        unsigned int enabled:5; /*
+                                 * Toggle fields are valid if enabled is 0,
+                                 * else A-channels must always be used.
+                                 */
+        unsigned int diag_dl:1;
+        unsigned int mdm_dl:1;
+        unsigned int mdm_ul:1;
+} __attribute__ ((packed));
+
+/* Configuration table to read at startup of card */
+/* Is for now only needed during initialization phase */
+struct config_table {
+        u32 signature;
+        u16 product_information;
+        u16 version;
+        u8 pad3[3];
+        struct toggles toggle;
+        u8 pad1[4];
+        u16 dl_mdm_len1;        /*
+                                 * If this is 64, it can hold
+                                 * 60 bytes + 4 that is length field
+                                 */
+        u16 dl_start;
+
+        u16 dl_diag_len1;
+        u16 dl_mdm_len2;        /*
+                                 * If this is 64, it can hold
+                                 * 60 bytes + 4 that is length field
+                                 */
+        u16 dl_app1_len;
+
+        u16 dl_diag_len2;
+        u16 dl_ctrl_len;
+        u16 dl_app2_len;
+        u8 pad2[16];
+        u16 ul_mdm_len1;
+        u16 ul_start;
+        u16 ul_diag_len;
+        u16 ul_mdm_len2;
+        u16 ul_app1_len;
+        u16 ul_app2_len;
+        u16 ul_ctrl_len;
+} __attribute__ ((packed));
+
+/* This stores all control downlink flags */
+struct ctrl_dl {
+        u8 port;
+        unsigned int reserved:4;
+        unsigned int CTS:1;
+        unsigned int RI:1;
+        unsigned int DCD:1;
+        unsigned int DSR:1;
+} __attribute__ ((packed));
+
+/* This stores all control uplink flags */
+struct ctrl_ul {
+        u8 port;
+        unsigned int reserved:6;
+        unsigned int RTS:1;
+        unsigned int DTR:1;
+} __attribute__ ((packed));
+
+#else
+/* Little endian */
+
+/* This represents the toggle information */
+struct toggles {
+        unsigned int mdm_ul:1;
+        unsigned int mdm_dl:1;
+        unsigned int diag_dl:1;
+        unsigned int enabled:5; /*
+                                 * Toggle fields are valid if enabled is 0,
+                                 * else A-channels must always be used.
+                                 */
+} __attribute__ ((packed));
+
+/* Configuration table to read at startup of card */
+struct config_table {
+        u32 signature;
+        u16 version;
+        u16 product_information;
+        struct toggles toggle;
+        u8 pad1[7];
+        u16 dl_start;
+        u16 dl_mdm_len1;        /*
+                                 * If this is 64, it can hold
+                                 * 60 bytes + 4 that is length field
+                                 */
+        u16 dl_mdm_len2;
+        u16 dl_diag_len1;
+        u16 dl_diag_len2;
+        u16 dl_app1_len;
+        u16 dl_app2_len;
+        u16 dl_ctrl_len;
+        u8 pad2[16];
+        u16 ul_start;
+        u16 ul_mdm_len2;
+        u16 ul_mdm_len1;
+        u16 ul_diag_len;
+        u16 ul_app1_len;
+        u16 ul_app2_len;
+        u16 ul_ctrl_len;
+} __attribute__ ((packed));
+
+/* This stores all control downlink flags */
+struct ctrl_dl {
+        unsigned int DSR:1;
+        unsigned int DCD:1;
+        unsigned int RI:1;
+        unsigned int CTS:1;
+        unsigned int reserverd:4;
+        u8 port;
+} __attribute__ ((packed));
+
+/* This stores all control uplink flags */
+struct ctrl_ul {
+        unsigned int DTR:1;
+        unsigned int RTS:1;
+        unsigned int reserved:6;
+        u8 port;
+} __attribute__ ((packed));
+#endif
+
+/* This holds all information that is needed regarding a port */
+struct port {
+        struct tty_port port;
+        u8 update_flow_control;
+        struct ctrl_ul ctrl_ul;
+        struct ctrl_dl ctrl_dl;
+        struct kfifo fifo_ul;
+        void __iomem *dl_addr[2];
+        u32 dl_size[2];
+        u8 toggle_dl;
+        void __iomem *ul_addr[2];
+        u32 ul_size[2];
+        u8 toggle_ul;
+        u16 token_dl;
+
+        wait_queue_head_t tty_wait;
+        struct async_icount tty_icount;
+
+        struct nozomi *dc;
+};
+
+/* Private data one for each card in the system */
+struct nozomi {
+        void __iomem *base_addr;
+        unsigned long flip;
+
+        /* Pointers to registers */
+        void __iomem *reg_iir;
+        void __iomem *reg_fcr;
+        void __iomem *reg_ier;
+
+        u16 last_ier;
+        enum card_type card_type;
+        struct config_table config_table;       /* Configuration table */
+        struct pci_dev *pdev;
+        struct port port[NOZOMI_MAX_PORTS];
+        u8 *send_buf;
+
+        spinlock_t spin_mutex;  /* secures access to registers and tty */
+
+        unsigned int index_start;
+        enum card_state state;
+        u32 open_ttys;
+};
+
+/* This is a data packet that is read or written to/from card */
+struct buffer {
+        u32 size;               /* size is the length of the data buffer */
+        u8 *data;
+} __attribute__ ((packed));
+
+/*    Global variables */
+static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
+        {PCI_DEVICE(0x1931, 0x000c)},   /* Nozomi HSDPA */
+        {},
+};
+
+MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
+
+static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
+static struct tty_driver *ntty_driver;
+
+static const struct tty_port_operations noz_tty_port_ops;
+
+/*
+ * find card by tty_index
+ */
+static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
+{
+        return tty ? ndevs[tty->index / MAX_PORT] : NULL;
+}
+
+static inline struct port *get_port_by_tty(const struct tty_struct *tty)
+{
+        struct nozomi *ndev = get_dc_by_tty(tty);
+        return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
+}
+
+/*
+ * TODO:
+ * -Optimize
+ * -Rewrite cleaner
+ */
+
+static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
+                        u32 size_bytes)
+{
+        u32 i = 0;
+        const u32 __iomem *ptr = mem_addr_start;
+        u16 *buf16;
+
+        if (unlikely(!ptr || !buf))
+                goto out;
+
+        /* shortcut for extremely often used cases */
+        switch (size_bytes) {
+        case 2: /* 2 bytes */
+                buf16 = (u16 *) buf;
+                *buf16 = __le16_to_cpu(readw(ptr));
+                goto out;
+                break;
+        case 4: /* 4 bytes */
+                *(buf) = __le32_to_cpu(readl(ptr));
+                goto out;
+                break;
+        }
+
+        while (i < size_bytes) {
+                if (size_bytes - i == 2) {
+                        /* Handle 2 bytes in the end */
+                        buf16 = (u16 *) buf;
+                        *(buf16) = __le16_to_cpu(readw(ptr));
+                        i += 2;
+                } else {
+                        /* Read 4 bytes */
+                        *(buf) = __le32_to_cpu(readl(ptr));
+                        i += 4;
+                }
+                buf++;
+                ptr++;
+        }
+out:
+        return;
+}
+
+/*
+ * TODO:
+ * -Optimize
+ * -Rewrite cleaner
+ */
+static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
+                        u32 size_bytes)
+{
+        u32 i = 0;
+        u32 __iomem *ptr = mem_addr_start;
+        const u16 *buf16;
+
+        if (unlikely(!ptr || !buf))
+                return 0;
+
+        /* shortcut for extremely often used cases */
+        switch (size_bytes) {
+        case 2: /* 2 bytes */
+                buf16 = (const u16 *)buf;
+                writew(__cpu_to_le16(*buf16), ptr);
+                return 2;
+                break;
+        case 1: /*
+                 * also needs to write 4 bytes in this case
+                 * so falling through..
+                 */
+        case 4: /* 4 bytes */
+                writel(__cpu_to_le32(*buf), ptr);
+                return 4;
+                break;
+        }
+
+        while (i < size_bytes) {
+                if (size_bytes - i == 2) {
+                        /* 2 bytes */
+                        buf16 = (const u16 *)buf;
+                        writew(__cpu_to_le16(*buf16), ptr);
+                        i += 2;
+                } else {
+                        /* 4 bytes */
+                        writel(__cpu_to_le32(*buf), ptr);
+                        i += 4;
+                }
+                buf++;
+                ptr++;
+        }
+        return i;
+}
+
+/* Setup pointers to different channels and also setup buffer sizes. */
+static void setup_memory(struct nozomi *dc)
+{
+        void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
+        /* The length reported is including the length field of 4 bytes,
+         * hence subtract with 4.
+         */
+        const u16 buff_offset = 4;
+
+        /* Modem port dl configuration */
+        dc->port[PORT_MDM].dl_addr[CH_A] = offset;
+        dc->port[PORT_MDM].dl_addr[CH_B] =
+                                (offset += dc->config_table.dl_mdm_len1);
+        dc->port[PORT_MDM].dl_size[CH_A] =
+                                dc->config_table.dl_mdm_len1 - buff_offset;
+        dc->port[PORT_MDM].dl_size[CH_B] =
+                                dc->config_table.dl_mdm_len2 - buff_offset;
+
+        /* Diag port dl configuration */
+        dc->port[PORT_DIAG].dl_addr[CH_A] =
+                                (offset += dc->config_table.dl_mdm_len2);
+        dc->port[PORT_DIAG].dl_size[CH_A] =
+                                dc->config_table.dl_diag_len1 - buff_offset;
+        dc->port[PORT_DIAG].dl_addr[CH_B] =
+                                (offset += dc->config_table.dl_diag_len1);
+        dc->port[PORT_DIAG].dl_size[CH_B] =
+                                dc->config_table.dl_diag_len2 - buff_offset;
+
+        /* App1 port dl configuration */
+        dc->port[PORT_APP1].dl_addr[CH_A] =
+                                (offset += dc->config_table.dl_diag_len2);
+        dc->port[PORT_APP1].dl_size[CH_A] =
+                                dc->config_table.dl_app1_len - buff_offset;
+
+        /* App2 port dl configuration */
+        dc->port[PORT_APP2].dl_addr[CH_A] =
+                                (offset += dc->config_table.dl_app1_len);
+        dc->port[PORT_APP2].dl_size[CH_A] =
+                                dc->config_table.dl_app2_len - buff_offset;
+
+        /* Ctrl dl configuration */
+        dc->port[PORT_CTRL].dl_addr[CH_A] =
+                                (offset += dc->config_table.dl_app2_len);
+        dc->port[PORT_CTRL].dl_size[CH_A] =
+                                dc->config_table.dl_ctrl_len - buff_offset;
+
+        offset = dc->base_addr + dc->config_table.ul_start;
+
+        /* Modem Port ul configuration */
+        dc->port[PORT_MDM].ul_addr[CH_A] = offset;
+        dc->port[PORT_MDM].ul_size[CH_A] =
+                                dc->config_table.ul_mdm_len1 - buff_offset;
+        dc->port[PORT_MDM].ul_addr[CH_B] =
+                                (offset += dc->config_table.ul_mdm_len1);
+        dc->port[PORT_MDM].ul_size[CH_B] =
+                                dc->config_table.ul_mdm_len2 - buff_offset;
+
+        /* Diag port ul configuration */
+        dc->port[PORT_DIAG].ul_addr[CH_A] =
+                                (offset += dc->config_table.ul_mdm_len2);
+        dc->port[PORT_DIAG].ul_size[CH_A] =
+                                dc->config_table.ul_diag_len - buff_offset;
+
+        /* App1 port ul configuration */
+        dc->port[PORT_APP1].ul_addr[CH_A] =
+                                (offset += dc->config_table.ul_diag_len);
+        dc->port[PORT_APP1].ul_size[CH_A] =
+                                dc->config_table.ul_app1_len - buff_offset;
+
+        /* App2 port ul configuration */
+        dc->port[PORT_APP2].ul_addr[CH_A] =
+                                (offset += dc->config_table.ul_app1_len);
+        dc->port[PORT_APP2].ul_size[CH_A] =
+                                dc->config_table.ul_app2_len - buff_offset;
+
+        /* Ctrl ul configuration */
+        dc->port[PORT_CTRL].ul_addr[CH_A] =
+                                (offset += dc->config_table.ul_app2_len);
+        dc->port[PORT_CTRL].ul_size[CH_A] =
+                                dc->config_table.ul_ctrl_len - buff_offset;
+}
+
+/* Dump config table under initalization phase */
+#ifdef DEBUG
+static void dump_table(const struct nozomi *dc)
+{
+        DBG3("signature: 0x%08X", dc->config_table.signature);
+        DBG3("version: 0x%04X", dc->config_table.version);
+        DBG3("product_information: 0x%04X", \
+                                dc->config_table.product_information);
+        DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
+        DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
+        DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
+        DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);
+
+        DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
+        DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
+           dc->config_table.dl_mdm_len1);
+        DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
+           dc->config_table.dl_mdm_len2);
+        DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
+           dc->config_table.dl_diag_len1);
+        DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
+           dc->config_table.dl_diag_len2);
+        DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
+           dc->config_table.dl_app1_len);
+        DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
+           dc->config_table.dl_app2_len);
+        DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
+           dc->config_table.dl_ctrl_len);
+        DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
+           dc->config_table.ul_start);
+        DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
+           dc->config_table.ul_mdm_len1);
+        DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
+           dc->config_table.ul_mdm_len2);
+        DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
+           dc->config_table.ul_diag_len);
+        DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
+           dc->config_table.ul_app1_len);
+        DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
+           dc->config_table.ul_app2_len);
+        DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
+           dc->config_table.ul_ctrl_len);
+}
+#else
+static inline void dump_table(const struct nozomi *dc) { }
+#endif
+
+/*
+ * Read configuration table from card under intalization phase
+ * Returns 1 if ok, else 0
+ */
+static int nozomi_read_config_table(struct nozomi *dc)
+{
+        read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
+                                                sizeof(struct config_table));
+
+        if (dc->config_table.signature != CONFIG_MAGIC) {
+                dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
+                        dc->config_table.signature, CONFIG_MAGIC);
+                return 0;
+        }
+
+        if ((dc->config_table.version == 0)
+            || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
+                int i;
+                DBG1("Second phase, configuring card");
+
+                setup_memory(dc);
+
+                dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
+                dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
+                dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
+                DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
+                   dc->port[PORT_MDM].toggle_ul,
+                   dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);
+
+                dump_table(dc);
+
+                for (i = PORT_MDM; i < MAX_PORT; i++) {
+                        memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
+                        memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
+                }
+
+                /* Enable control channel */
+                dc->last_ier = dc->last_ier | CTRL_DL;
+                writew(dc->last_ier, dc->reg_ier);
+
+                dc->state = NOZOMI_STATE_ALLOCATED;
+                dev_info(&dc->pdev->dev, "Initialization OK!\n");
+                return 1;
+        }
+
+        if ((dc->config_table.version > 0)
+            && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
+                u32 offset = 0;
+                DBG1("First phase: pushing upload buffers, clearing download");
+
+                dev_info(&dc->pdev->dev, "Version of card: %d\n",
+                         dc->config_table.version);
+
+                /* Here we should disable all I/O over F32. */
+                setup_memory(dc);
+
+                /*
+                 * We should send ALL channel pair tokens back along
+                 * with reset token
+                 */
+
+                /* push upload modem buffers */
+                write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
+                        (u32 *) &offset, 4);
+                write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
+                        (u32 *) &offset, 4);
+
+                writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);
+
+                DBG1("First phase done");
+        }
+
+        return 1;
+}
+
+/* Enable uplink interrupts  */
+static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
+{
+        static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};
+
+        if (port < NOZOMI_MAX_PORTS) {
+                dc->last_ier |= mask[port];
+                writew(dc->last_ier, dc->reg_ier);
+        } else {
+                dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+        }
+}
+
+/* Disable uplink interrupts  */
+static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
+{
+        static const u16 mask[] =
+                {~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};
+
+        if (port < NOZOMI_MAX_PORTS) {
+                dc->last_ier &= mask[port];
+                writew(dc->last_ier, dc->reg_ier);
+        } else {
+                dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+        }
+}
+
+/* Enable downlink interrupts */
+static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
+{
+        static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};
+
+        if (port < NOZOMI_MAX_PORTS) {
+                dc->last_ier |= mask[port];
+                writew(dc->last_ier, dc->reg_ier);
+        } else {
+                dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+        }
+}
+
+/* Disable downlink interrupts */
+static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
+{
+        static const u16 mask[] =
+                {~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};
+
+        if (port < NOZOMI_MAX_PORTS) {
+                dc->last_ier &= mask[port];
+                writew(dc->last_ier, dc->reg_ier);
+        } else {
+                dev_err(&dc->pdev->dev, "Called with wrong port?\n");
+        }
+}
+
+/*
+ * Return 1 - send buffer to card and ack.
+ * Return 0 - don't ack, don't send buffer to card.
+ */
+static int send_data(enum port_type index, struct nozomi *dc)
+{
+        u32 size = 0;
+        struct port *port = &dc->port[index];
+        const u8 toggle = port->toggle_ul;
+        void __iomem *addr = port->ul_addr[toggle];
+        const u32 ul_size = port->ul_size[toggle];
+        struct tty_struct *tty = tty_port_tty_get(&port->port);
+
+        /* Get data from tty and place in buf for now */
+        size = kfifo_out(&port->fifo_ul, dc->send_buf,
+                           ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);
+
+        if (size == 0) {
+                DBG4("No more data to send, disable link:");
+                tty_kref_put(tty);
+                return 0;
+        }
+
+        /* DUMP(buf, size); */
+
+        /* Write length + data */
+        write_mem32(addr, (u32 *) &size, 4);
+        write_mem32(addr + 4, (u32 *) dc->send_buf, size);
+
+        if (tty)
+                tty_wakeup(tty);
+
+        tty_kref_put(tty);
+        return 1;
+}
+
+/* If all data has been read, return 1, else 0 */
+static int receive_data(enum port_type index, struct nozomi *dc)
+{
+        u8 buf[RECEIVE_BUF_MAX] = { 0 };
+        int size;
+        u32 offset = 4;
+        struct port *port = &dc->port[index];
+        void __iomem *addr = port->dl_addr[port->toggle_dl];
+        struct tty_struct *tty = tty_port_tty_get(&port->port);
+        int i, ret;
+
+        if (unlikely(!tty)) {
+                DBG1("tty not open for port: %d?", index);
+                return 1;
+        }
+
+        read_mem32((u32 *) &size, addr, 4);
+        /*  DBG1( "%d bytes port: %d", size, index); */
+
+        if (test_bit(TTY_THROTTLED, &tty->flags)) {
+                DBG1("No room in tty, don't read data, don't ack interrupt, "
+                        "disable interrupt");
+
+                /* disable interrupt in downlink... */
+                disable_transmit_dl(index, dc);
+                ret = 0;
+                goto put;
+        }
+
+        if (unlikely(size == 0)) {
+                dev_err(&dc->pdev->dev, "size == 0?\n");
+                ret = 1;
+                goto put;
+        }
+
+        while (size > 0) {
+                read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);
+
+                if (size == 1) {
+                        tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
+                        size = 0;
+                } else if (size < RECEIVE_BUF_MAX) {
+                        size -= tty_insert_flip_string(tty, (char *) buf, size);
+                } else {
+                        i = tty_insert_flip_string(tty, \
+                                                (char *) buf, RECEIVE_BUF_MAX);
+                        size -= i;
+                        offset += i;
+                }
+        }
+
+        set_bit(index, &dc->flip);
+        ret = 1;
+put:
+        tty_kref_put(tty);
+        return ret;
+}
+
+/* Debug for interrupts */
+#ifdef DEBUG
+static char *interrupt2str(u16 interrupt)
+{
+        static char buf[TMP_BUF_MAX];
+        char *p = buf;
+
+        interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
+        interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "MDM_DL2 ") : NULL;
+
+        interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "MDM_UL1 ") : NULL;
+        interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "MDM_UL2 ") : NULL;
+
+        interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "DIAG_DL1 ") : NULL;
+        interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "DIAG_DL2 ") : NULL;
+
+        interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "DIAG_UL ") : NULL;
+
+        interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "APP1_DL ") : NULL;
+        interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "APP2_DL ") : NULL;
+
+        interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "APP1_UL ") : NULL;
+        interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "APP2_UL ") : NULL;
+
+        interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "CTRL_DL ") : NULL;
+        interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "CTRL_UL ") : NULL;
+
+        interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
+                                        "RESET ") : NULL;
+
+        return buf;
+}
+#endif
+
+/*
+ * Receive flow control
+ * Return 1 - If ok, else 0
+ */
+static int receive_flow_control(struct nozomi *dc)
+{
+        enum port_type port = PORT_MDM;
+        struct ctrl_dl ctrl_dl;
+        struct ctrl_dl old_ctrl;
+        u16 enable_ier = 0;
+
+        read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);
+
+        switch (ctrl_dl.port) {
+        case CTRL_CMD:
+                DBG1("The Base Band sends this value as a response to a "
+                        "request for IMSI detach sent over the control "
+                        "channel uplink (see section 7.6.1).");
+                break;
+        case CTRL_MDM:
+                port = PORT_MDM;
+                enable_ier = MDM_DL;
+                break;
+        case CTRL_DIAG:
+                port = PORT_DIAG;
+                enable_ier = DIAG_DL;
+                break;
+        case CTRL_APP1:
+                port = PORT_APP1;
+                enable_ier = APP1_DL;
+                break;
+        case CTRL_APP2:
+                port = PORT_APP2;
+                enable_ier = APP2_DL;
+                if (dc->state == NOZOMI_STATE_ALLOCATED) {
+                        /*
+                         * After card initialization the flow control
+                         * received for APP2 is always the last
+                         */
+                        dc->state = NOZOMI_STATE_READY;
+                        dev_info(&dc->pdev->dev, "Device READY!\n");
+                }
+                break;
+        default:
+                dev_err(&dc->pdev->dev,
+                        "ERROR: flow control received for non-existing port\n");
+                return 0;
+        };
+
+        DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
+           *((u16 *)&ctrl_dl));
+
+        old_ctrl = dc->port[port].ctrl_dl;
+        dc->port[port].ctrl_dl = ctrl_dl;
+
+        if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
+                DBG1("Disable interrupt (0x%04X) on port: %d",
+                        enable_ier, port);
+                disable_transmit_ul(port, dc);
+
+        } else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {
+
+                if (kfifo_len(&dc->port[port].fifo_ul)) {
+                        DBG1("Enable interrupt (0x%04X) on port: %d",
+                                enable_ier, port);
+                        DBG1("Data in buffer [%d], enable transmit! ",
+                                kfifo_len(&dc->port[port].fifo_ul));
+                        enable_transmit_ul(port, dc);
+                } else {
+                        DBG1("No data in buffer...");
+                }
+        }
+
+        if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
+                DBG1(" No change in mctrl");
+                return 1;
+        }
+        /* Update statistics */
+        if (old_ctrl.CTS != ctrl_dl.CTS)
+                dc->port[port].tty_icount.cts++;
+        if (old_ctrl.DSR != ctrl_dl.DSR)
+                dc->port[port].tty_icount.dsr++;
+        if (old_ctrl.RI != ctrl_dl.RI)
+                dc->port[port].tty_icount.rng++;
+        if (old_ctrl.DCD != ctrl_dl.DCD)
+                dc->port[port].tty_icount.dcd++;
+
+        wake_up_interruptible(&dc->port[port].tty_wait);
+
+        DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
+           port,
+           dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
+           dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);
+
+        return 1;
+}
+
+static enum ctrl_port_type port2ctrl(enum port_type port,
+                                        const struct nozomi *dc)
+{
+        switch (port) {
+        case PORT_MDM:
+                return CTRL_MDM;
+        case PORT_DIAG:
+                return CTRL_DIAG;
+        case PORT_APP1:
+                return CTRL_APP1;
+        case PORT_APP2:
+                return CTRL_APP2;
+        default:
+                dev_err(&dc->pdev->dev,
+                        "ERROR: send flow control " \
+                        "received for non-existing port\n");
+        };
+        return CTRL_ERROR;
+}
+
+/*
+ * Send flow control, can only update one channel at a time
+ * Return 0 - If we have updated all flow control
+ * Return 1 - If we need to update more flow control, ack current enable more
+ */
+static int send_flow_control(struct nozomi *dc)
+{
+        u32 i, more_flow_control_to_be_updated = 0;
+        u16 *ctrl;
+
+        for (i = PORT_MDM; i < MAX_PORT; i++) {
+                if (dc->port[i].update_flow_control) {
+                        if (more_flow_control_to_be_updated) {
+                                /* We have more flow control to be updated */
+                                return 1;
+                        }
+                        dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
+                        ctrl = (u16 *)&dc->port[i].ctrl_ul;
+                        write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
+                                (u32 *) ctrl, 2);
+                        dc->port[i].update_flow_control = 0;
+                        more_flow_control_to_be_updated = 1;
+                }
+        }
+        return 0;
+}
+
+/*
+ * Handle downlink data, ports that are handled are modem and diagnostics
+ * Return 1 - ok
+ * Return 0 - toggle fields are out of sync
+ */
+static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
+                        u16 read_iir, u16 mask1, u16 mask2)
+{
+        if (*toggle == 0 && read_iir & mask1) {
+                if (receive_data(port, dc)) {
+                        writew(mask1, dc->reg_fcr);
+                        *toggle = !(*toggle);
+                }
+
+                if (read_iir & mask2) {
+                        if (receive_data(port, dc)) {
+                                writew(mask2, dc->reg_fcr);
+                                *toggle = !(*toggle);
+                        }
+                }
+        } else if (*toggle == 1 && read_iir & mask2) {
+                if (receive_data(port, dc)) {
+                        writew(mask2, dc->reg_fcr);
+                        *toggle = !(*toggle);
+                }
+
+                if (read_iir & mask1) {
+                        if (receive_data(port, dc)) {
+                                writew(mask1, dc->reg_fcr);
+                                *toggle = !(*toggle);
+                        }
+                }
+        } else {
+                dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
+                        *toggle);
+                return 0;
+        }
+        return 1;
+}
+
+/*
+ * Handle uplink data, this is currently for the modem port
+ * Return 1 - ok
+ * Return 0 - toggle field are out of sync
+ */
+static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
+{
+        u8 *toggle = &(dc->port[port].toggle_ul);
+
+        if (*toggle == 0 && read_iir & MDM_UL1) {
+                dc->last_ier &= ~MDM_UL;
+                writew(dc->last_ier, dc->reg_ier);
+                if (send_data(port, dc)) {
+                        writew(MDM_UL1, dc->reg_fcr);
+                        dc->last_ier = dc->last_ier | MDM_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                        *toggle = !*toggle;
+                }
+
+                if (read_iir & MDM_UL2) {
+                        dc->last_ier &= ~MDM_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                        if (send_data(port, dc)) {
+                                writew(MDM_UL2, dc->reg_fcr);
+                                dc->last_ier = dc->last_ier | MDM_UL;
+                                writew(dc->last_ier, dc->reg_ier);
+                                *toggle = !*toggle;
+                        }
+                }
+
+        } else if (*toggle == 1 && read_iir & MDM_UL2) {
+                dc->last_ier &= ~MDM_UL;
+                writew(dc->last_ier, dc->reg_ier);
+                if (send_data(port, dc)) {
+                        writew(MDM_UL2, dc->reg_fcr);
+                        dc->last_ier = dc->last_ier | MDM_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                        *toggle = !*toggle;
+                }
+
+                if (read_iir & MDM_UL1) {
+                        dc->last_ier &= ~MDM_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                        if (send_data(port, dc)) {
+                                writew(MDM_UL1, dc->reg_fcr);
+                                dc->last_ier = dc->last_ier | MDM_UL;
+                                writew(dc->last_ier, dc->reg_ier);
+                                *toggle = !*toggle;
+                        }
+                }
+        } else {
+                writew(read_iir & MDM_UL, dc->reg_fcr);
+                dev_err(&dc->pdev->dev, "port out of sync!\n");
+                return 0;
+        }
+        return 1;
+}
+
+static irqreturn_t interrupt_handler(int irq, void *dev_id)
+{
+        struct nozomi *dc = dev_id;
+        unsigned int a;
+        u16 read_iir;
+
+        if (!dc)
+                return IRQ_NONE;
+
+        spin_lock(&dc->spin_mutex);
+        read_iir = readw(dc->reg_iir);
+
+        /* Card removed */
+        if (read_iir == (u16)-1)
+                goto none;
+        /*
+         * Just handle interrupt enabled in IER
+         * (by masking with dc->last_ier)
+         */
+        read_iir &= dc->last_ier;
+
+        if (read_iir == 0)
+                goto none;
+
+
+        DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
+                dc->last_ier);
+
+        if (read_iir & RESET) {
+                if (unlikely(!nozomi_read_config_table(dc))) {
+                        dc->last_ier = 0x0;
+                        writew(dc->last_ier, dc->reg_ier);
+                        dev_err(&dc->pdev->dev, "Could not read status from "
+                                "card, we should disable interface\n");
+                } else {
+                        writew(RESET, dc->reg_fcr);
+                }
+                /* No more useful info if this was the reset interrupt. */
+                goto exit_handler;
+        }
+        if (read_iir & CTRL_UL) {
+                DBG1("CTRL_UL");
+                dc->last_ier &= ~CTRL_UL;
+                writew(dc->last_ier, dc->reg_ier);
+                if (send_flow_control(dc)) {
+                        writew(CTRL_UL, dc->reg_fcr);
+                        dc->last_ier = dc->last_ier | CTRL_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                }
+        }
+        if (read_iir & CTRL_DL) {
+                receive_flow_control(dc);
+                writew(CTRL_DL, dc->reg_fcr);
+        }
+        if (read_iir & MDM_DL) {
+                if (!handle_data_dl(dc, PORT_MDM,
+                                &(dc->port[PORT_MDM].toggle_dl), read_iir,
+                                MDM_DL1, MDM_DL2)) {
+                        dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
+                        goto exit_handler;
+                }
+        }
+        if (read_iir & MDM_UL) {
+                if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
+                        dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
+                        goto exit_handler;
+                }
+        }
+        if (read_iir & DIAG_DL) {
+                if (!handle_data_dl(dc, PORT_DIAG,
+                                &(dc->port[PORT_DIAG].toggle_dl), read_iir,
+                                DIAG_DL1, DIAG_DL2)) {
+                        dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
+                        goto exit_handler;
+                }
+        }
+        if (read_iir & DIAG_UL) {
+                dc->last_ier &= ~DIAG_UL;
+                writew(dc->last_ier, dc->reg_ier);
+                if (send_data(PORT_DIAG, dc)) {
+                        writew(DIAG_UL, dc->reg_fcr);
+                        dc->last_ier = dc->last_ier | DIAG_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                }
+        }
+        if (read_iir & APP1_DL) {
+                if (receive_data(PORT_APP1, dc))
+                        writew(APP1_DL, dc->reg_fcr);
+        }
+        if (read_iir & APP1_UL) {
+                dc->last_ier &= ~APP1_UL;
+                writew(dc->last_ier, dc->reg_ier);
+                if (send_data(PORT_APP1, dc)) {
+                        writew(APP1_UL, dc->reg_fcr);
+                        dc->last_ier = dc->last_ier | APP1_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                }
+        }
+        if (read_iir & APP2_DL) {
+                if (receive_data(PORT_APP2, dc))
+                        writew(APP2_DL, dc->reg_fcr);
+        }
+        if (read_iir & APP2_UL) {
+                dc->last_ier &= ~APP2_UL;
+                writew(dc->last_ier, dc->reg_ier);
+                if (send_data(PORT_APP2, dc)) {
+                        writew(APP2_UL, dc->reg_fcr);
+                        dc->last_ier = dc->last_ier | APP2_UL;
+                        writew(dc->last_ier, dc->reg_ier);
+                }
+        }
+
+exit_handler:
+        spin_unlock(&dc->spin_mutex);
+        for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
+                struct tty_struct *tty;
+                if (test_and_clear_bit(a, &dc->flip)) {
+                        tty = tty_port_tty_get(&dc->port[a].port);
+                        if (tty)
+                                tty_flip_buffer_push(tty);
+                        tty_kref_put(tty);
+                }
+        }
+        return IRQ_HANDLED;
+none:
+        spin_unlock(&dc->spin_mutex);
+        return IRQ_NONE;
+}
+
+static void nozomi_get_card_type(struct nozomi *dc)
+{
+        int i;
+        u32 size = 0;
+
+        for (i = 0; i < 6; i++)
+                size += pci_resource_len(dc->pdev, i);
+
+        /* Assume card type F32_8 if no match */
+        dc->card_type = size == 2048 ? F32_2 : F32_8;
+
+        dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
+}
+
+static void nozomi_setup_private_data(struct nozomi *dc)
+{
+        void __iomem *offset = dc->base_addr + dc->card_type / 2;
+        unsigned int i;
+
+        dc->reg_fcr = (void __iomem *)(offset + R_FCR);
+        dc->reg_iir = (void __iomem *)(offset + R_IIR);
+        dc->reg_ier = (void __iomem *)(offset + R_IER);
+        dc->last_ier = 0;
+        dc->flip = 0;
+
+        dc->port[PORT_MDM].token_dl = MDM_DL;
+        dc->port[PORT_DIAG].token_dl = DIAG_DL;
+        dc->port[PORT_APP1].token_dl = APP1_DL;
+        dc->port[PORT_APP2].token_dl = APP2_DL;
+
+        for (i = 0; i < MAX_PORT; i++)
+                init_waitqueue_head(&dc->port[i].tty_wait);
+}
+
+static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
+                          char *buf)
+{
+        const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
+
+        return sprintf(buf, "%d\n", dc->card_type);
+}
+static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);
+
+static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
+                          char *buf)
+{
+        const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));
+
+        return sprintf(buf, "%u\n", dc->open_ttys);
+}
+static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);
+
+static void make_sysfs_files(struct nozomi *dc)
+{
+        if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
+                dev_err(&dc->pdev->dev,
+                        "Could not create sysfs file for card_type\n");
+        if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
+                dev_err(&dc->pdev->dev,
+                        "Could not create sysfs file for open_ttys\n");
+}
+
+static void remove_sysfs_files(struct nozomi *dc)
+{
+        device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
+        device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
+}
+
+/* Allocate memory for one device */
+static int __devinit nozomi_card_init(struct pci_dev *pdev,
+                                      const struct pci_device_id *ent)
+{
+        resource_size_t start;
+        int ret;
+        struct nozomi *dc = NULL;
+        int ndev_idx;
+        int i;
+
+        dev_dbg(&pdev->dev, "Init, new card found\n");
+
+        for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
+                if (!ndevs[ndev_idx])
+                        break;
+
+        if (ndev_idx >= ARRAY_SIZE(ndevs)) {
+                dev_err(&pdev->dev, "no free tty range for this card left\n");
+                ret = -EIO;
+                goto err;
+        }
+
+        dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
+        if (unlikely(!dc)) {
+                dev_err(&pdev->dev, "Could not allocate memory\n");
+                ret = -ENOMEM;
+                goto err_free;
+        }
+
+        dc->pdev = pdev;
+
+        ret = pci_enable_device(dc->pdev);
+        if (ret) {
+                dev_err(&pdev->dev, "Failed to enable PCI Device\n");
+                goto err_free;
+        }
+
+        ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
+        if (ret) {
+                dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
+                        (int) /* nozomi_private.io_addr */ 0);
+                goto err_disable_device;
+        }
+
+        start = pci_resource_start(dc->pdev, 0);
+        if (start == 0) {
+                dev_err(&pdev->dev, "No I/O address for card detected\n");
+                ret = -ENODEV;
+                goto err_rel_regs;
+        }
+
+        /* Find out what card type it is */
+        nozomi_get_card_type(dc);
+
+        dc->base_addr = ioremap_nocache(start, dc->card_type);
+        if (!dc->base_addr) {
+                dev_err(&pdev->dev, "Unable to map card MMIO\n");
+                ret = -ENODEV;
+                goto err_rel_regs;
+        }
+
+        dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
+        if (!dc->send_buf) {
+                dev_err(&pdev->dev, "Could not allocate send buffer?\n");
+                ret = -ENOMEM;
+                goto err_free_sbuf;
+        }
+
+        for (i = PORT_MDM; i < MAX_PORT; i++) {
+                if (kfifo_alloc(&dc->port[i].fifo_ul, FIFO_BUFFER_SIZE_UL,
+                                        GFP_KERNEL)) {
+                        dev_err(&pdev->dev,
+                                        "Could not allocate kfifo buffer\n");
+                        ret = -ENOMEM;
+                        goto err_free_kfifo;
+                }
+        }
+
+        spin_lock_init(&dc->spin_mutex);
+
+        nozomi_setup_private_data(dc);
+
+        /* Disable all interrupts */
+        dc->last_ier = 0;
+        writew(dc->last_ier, dc->reg_ier);
+
+        ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
+                        NOZOMI_NAME, dc);
+        if (unlikely(ret)) {
+                dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
+                goto err_free_kfifo;
+        }
+
+        DBG1("base_addr: %p", dc->base_addr);
+
+        make_sysfs_files(dc);
+
+        dc->index_start = ndev_idx * MAX_PORT;
+        ndevs[ndev_idx] = dc;
+
+        pci_set_drvdata(pdev, dc);
+
+        /* Enable RESET interrupt */
+        dc->last_ier = RESET;
+        iowrite16(dc->last_ier, dc->reg_ier);
+
+        dc->state = NOZOMI_STATE_ENABLED;
+
+        for (i = 0; i < MAX_PORT; i++) {
+                struct device *tty_dev;
+                struct port *port = &dc->port[i];
+                port->dc = dc;
+                tty_port_init(&port->port);
+                port->port.ops = &noz_tty_port_ops;
+                tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
+                                                        &pdev->dev);
+
+                if (IS_ERR(tty_dev)) {
+                        ret = PTR_ERR(tty_dev);
+                        dev_err(&pdev->dev, "Could not allocate tty?\n");
+                        goto err_free_tty;
+                }
+        }
+
+        return 0;
+
+err_free_tty:
+        for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
+                tty_unregister_device(ntty_driver, i);
+err_free_kfifo:
+        for (i = 0; i < MAX_PORT; i++)
+                kfifo_free(&dc->port[i].fifo_ul);
+err_free_sbuf:
+        kfree(dc->send_buf);
+        iounmap(dc->base_addr);
+err_rel_regs:
+        pci_release_regions(pdev);
+err_disable_device:
+        pci_disable_device(pdev);
+err_free:
+        kfree(dc);
+err:
+        return ret;
+}
+
+static void __devexit tty_exit(struct nozomi *dc)
+{
+        unsigned int i;
+
+        DBG1(" ");
+
+        for (i = 0; i < MAX_PORT; ++i) {
+                struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
+                if (tty && list_empty(&tty->hangup_work.entry))
+                        tty_hangup(tty);
+                tty_kref_put(tty);
+        }
+        /* Racy below - surely should wait for scheduled work to be done or
+           complete off a hangup method ? */
+        while (dc->open_ttys)
+                msleep(1);
+        for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
+                tty_unregister_device(ntty_driver, i);
+}
+
+/* Deallocate memory for one device */
+static void __devexit nozomi_card_exit(struct pci_dev *pdev)
+{
+        int i;
+        struct ctrl_ul ctrl;
+        struct nozomi *dc = pci_get_drvdata(pdev);
+
+        /* Disable all interrupts */
+        dc->last_ier = 0;
+        writew(dc->last_ier, dc->reg_ier);
+
+        tty_exit(dc);
+
+        /* Send 0x0001, command card to resend the reset token.  */
+        /* This is to get the reset when the module is reloaded. */
+        ctrl.port = 0x00;
+        ctrl.reserved = 0;
+        ctrl.RTS = 0;
+        ctrl.DTR = 1;
+        DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));
+
+        /* Setup dc->reg addresses to we can use defines here */
+        write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
+        writew(CTRL_UL, dc->reg_fcr);   /* push the token to the card. */
+
+        remove_sysfs_files(dc);
+
+        free_irq(pdev->irq, dc);
+
+        for (i = 0; i < MAX_PORT; i++)
+                kfifo_free(&dc->port[i].fifo_ul);
+
+        kfree(dc->send_buf);
+
+        iounmap(dc->base_addr);
+
+        pci_release_regions(pdev);
+
+        pci_disable_device(pdev);
+
+        ndevs[dc->index_start / MAX_PORT] = NULL;
+
+        kfree(dc);
+}
+
+static void set_rts(const struct tty_struct *tty, int rts)
+{
+        struct port *port = get_port_by_tty(tty);
+
+        port->ctrl_ul.RTS = rts;
+        port->update_flow_control = 1;
+        enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
+}
+
+static void set_dtr(const struct tty_struct *tty, int dtr)
+{
+        struct port *port = get_port_by_tty(tty);
+
+        DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);
+
+        port->ctrl_ul.DTR = dtr;
+        port->update_flow_control = 1;
+        enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
+}
+
+/*
+ * ----------------------------------------------------------------------------
+ * TTY code
+ * ----------------------------------------------------------------------------
+ */
+
+static int ntty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+        struct port *port = get_port_by_tty(tty);
+        struct nozomi *dc = get_dc_by_tty(tty);
+        int ret;
+        if (!port || !dc || dc->state != NOZOMI_STATE_READY)
+                return -ENODEV;
+        ret = tty_init_termios(tty);
+        if (ret == 0) {
+                tty_driver_kref_get(driver);
+                tty->count++;
+                tty->driver_data = port;
+                driver->ttys[tty->index] = tty;
+        }
+        return ret;
+}
+
+static void ntty_cleanup(struct tty_struct *tty)
+{
+        tty->driver_data = NULL;
+}
+
+static int ntty_activate(struct tty_port *tport, struct tty_struct *tty)
+{
+        struct port *port = container_of(tport, struct port, port);
+        struct nozomi *dc = port->dc;
+        unsigned long flags;
+
+        DBG1("open: %d", port->token_dl);
+        spin_lock_irqsave(&dc->spin_mutex, flags);
+        dc->last_ier = dc->last_ier | port->token_dl;
+        writew(dc->last_ier, dc->reg_ier);
+        dc->open_ttys++;
+        spin_unlock_irqrestore(&dc->spin_mutex, flags);
+        printk("noz: activated %d: %p\n", tty->index, tport);
+        return 0;
+}
+
+static int ntty_open(struct tty_struct *tty, struct file *filp)
+{
+        struct port *port = tty->driver_data;
+        return tty_port_open(&port->port, tty, filp);
+}
+
+static void ntty_shutdown(struct tty_port *tport)
+{
+        struct port *port = container_of(tport, struct port, port);
+        struct nozomi *dc = port->dc;
+        unsigned long flags;
+
+        DBG1("close: %d", port->token_dl);
+        spin_lock_irqsave(&dc->spin_mutex, flags);
+        dc->last_ier &= ~(port->token_dl);
+        writew(dc->last_ier, dc->reg_ier);
+        dc->open_ttys--;
+        spin_unlock_irqrestore(&dc->spin_mutex, flags);
+        printk("noz: shutdown %p\n", tport);
+}
+
+static void ntty_close(struct tty_struct *tty, struct file *filp)
+{
+        struct port *port = tty->driver_data;
+        if (port)
+                tty_port_close(&port->port, tty, filp);
+}
+
+static void ntty_hangup(struct tty_struct *tty)
+{
+        struct port *port = tty->driver_data;
+        tty_port_hangup(&port->port);
+}
+
+/*
+ * called when the userspace process writes to the tty (/dev/noz*).
+ * Data is inserted into a fifo, which is then read and transferred to the modem.
+ */
+static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
+                      int count)
+{
+        int rval = -EINVAL;
+        struct nozomi *dc = get_dc_by_tty(tty);
+        struct port *port = tty->driver_data;
+        unsigned long flags;
+
+        /* DBG1( "WRITEx: %d, index = %d", count, index); */
+
+        if (!dc || !port)
+                return -ENODEV;
+
+        rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);
+
+        /* notify card */
+        if (unlikely(dc == NULL)) {
+                DBG1("No device context?");
+                goto exit;
+        }
+
+        spin_lock_irqsave(&dc->spin_mutex, flags);
+        /* CTS is only valid on the modem channel */
+        if (port == &(dc->port[PORT_MDM])) {
+                if (port->ctrl_dl.CTS) {
+                        DBG4("Enable interrupt");
+                        enable_transmit_ul(tty->index % MAX_PORT, dc);
+                } else {
+                        dev_err(&dc->pdev->dev,
+                                "CTS not active on modem port?\n");
+                }
+        } else {
+                enable_transmit_ul(tty->index % MAX_PORT, dc);
+        }
+        spin_unlock_irqrestore(&dc->spin_mutex, flags);
+
+exit:
+        return rval;
+}
+
+/*
+ * Calculate how much is left in device
+ * This method is called by the upper tty layer.
+ *   #according to sources N_TTY.c it expects a value >= 0 and
+ *    does not check for negative values.
+ *
+ * If the port is unplugged report lots of room and let the bits
+ * dribble away so we don't block anything.
+ */
+static int ntty_write_room(struct tty_struct *tty)
+{
+        struct port *port = tty->driver_data;
+        int room = 4096;
+        const struct nozomi *dc = get_dc_by_tty(tty);
+
+        if (dc)
+                room = kfifo_avail(&port->fifo_ul);
+
+        return room;
+}
+
+/* Gets io control parameters */
+static int ntty_tiocmget(struct tty_struct *tty)
+{
+        const struct port *port = tty->driver_data;
+        const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
+        const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;
+
+        /* Note: these could change under us but it is not clear this
+           matters if so */
+        return  (ctrl_ul->RTS ? TIOCM_RTS : 0) |
+                (ctrl_ul->DTR ? TIOCM_DTR : 0) |
+                (ctrl_dl->DCD ? TIOCM_CAR : 0) |
+                (ctrl_dl->RI  ? TIOCM_RNG : 0) |
+                (ctrl_dl->DSR ? TIOCM_DSR : 0) |
+                (ctrl_dl->CTS ? TIOCM_CTS : 0);
+}
+
+/* Sets io controls parameters */
+static int ntty_tiocmset(struct tty_struct *tty,
+                                        unsigned int set, unsigned int clear)
+{
+        struct nozomi *dc = get_dc_by_tty(tty);
+        unsigned long flags;
+
+        spin_lock_irqsave(&dc->spin_mutex, flags);
+        if (set & TIOCM_RTS)
+                set_rts(tty, 1);
+        else if (clear & TIOCM_RTS)
+                set_rts(tty, 0);
+
+        if (set & TIOCM_DTR)
+                set_dtr(tty, 1);
+        else if (clear & TIOCM_DTR)
+                set_dtr(tty, 0);
+        spin_unlock_irqrestore(&dc->spin_mutex, flags);
+
+        return 0;
+}
+
+static int ntty_cflags_changed(struct port *port, unsigned long flags,
+                struct async_icount *cprev)
+{
+        const struct async_icount cnow = port->tty_icount;
+        int ret;
+
+        ret =   ((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
+                ((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
+                ((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
+                ((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));
+
+        *cprev = cnow;
+
+        return ret;
+}
+
+static int ntty_tiocgicount(struct tty_struct *tty,
+                                struct serial_icounter_struct *icount)
+{
+        struct port *port = tty->driver_data;
+        const struct async_icount cnow = port->tty_icount;
+
+        icount->cts = cnow.cts;
+        icount->dsr = cnow.dsr;
+        icount->rng = cnow.rng;
+        icount->dcd = cnow.dcd;
+        icount->rx = cnow.rx;
+        icount->tx = cnow.tx;
+        icount->frame = cnow.frame;
+        icount->overrun = cnow.overrun;
+        icount->parity = cnow.parity;
+        icount->brk = cnow.brk;
+        icount->buf_overrun = cnow.buf_overrun;
+        return 0;
+}
+
+static int ntty_ioctl(struct tty_struct *tty,
+                      unsigned int cmd, unsigned long arg)
+{
+        struct port *port = tty->driver_data;
+        int rval = -ENOIOCTLCMD;
+
+        DBG1("******** IOCTL, cmd: %d", cmd);
+
+        switch (cmd) {
+        case TIOCMIWAIT: {
+                struct async_icount cprev = port->tty_icount;
+
+                rval = wait_event_interruptible(port->tty_wait,
+                                ntty_cflags_changed(port, arg, &cprev));
+                break;
+        }
+        default:
+                DBG1("ERR: 0x%08X, %d", cmd, cmd);
+                break;
+        };
+
+        return rval;
+}
+
+/*
+ * Called by the upper tty layer when tty buffers are ready
+ * to receive data again after a call to throttle.
+ */
+static void ntty_unthrottle(struct tty_struct *tty)
+{
+        struct nozomi *dc = get_dc_by_tty(tty);
+        unsigned long flags;
+
+        DBG1("UNTHROTTLE");
+        spin_lock_irqsave(&dc->spin_mutex, flags);
+        enable_transmit_dl(tty->index % MAX_PORT, dc);
+        set_rts(tty, 1);
+
+        spin_unlock_irqrestore(&dc->spin_mutex, flags);
+}
+
+/*
+ * Called by the upper tty layer when the tty buffers are almost full.
+ * The driver should stop send more data.
+ */
+static void ntty_throttle(struct tty_struct *tty)
+{
+        struct nozomi *dc = get_dc_by_tty(tty);
+        unsigned long flags;
+
+        DBG1("THROTTLE");
+        spin_lock_irqsave(&dc->spin_mutex, flags);
+        set_rts(tty, 0);
+        spin_unlock_irqrestore(&dc->spin_mutex, flags);
+}
+
+/* Returns number of chars in buffer, called by tty layer */
+static s32 ntty_chars_in_buffer(struct tty_struct *tty)
+{
+        struct port *port = tty->driver_data;
+        struct nozomi *dc = get_dc_by_tty(tty);
+        s32 rval = 0;
+
+        if (unlikely(!dc || !port)) {
+                goto exit_in_buffer;
+        }
+
+        rval = kfifo_len(&port->fifo_ul);
+
+exit_in_buffer:
+        return rval;
+}
+
+static const struct tty_port_operations noz_tty_port_ops = {
+        .activate = ntty_activate,
+        .shutdown = ntty_shutdown,
+};
+
+static const struct tty_operations tty_ops = {
+        .ioctl = ntty_ioctl,
+        .open = ntty_open,
+        .close = ntty_close,
+        .hangup = ntty_hangup,
+        .write = ntty_write,
+        .write_room = ntty_write_room,
+        .unthrottle = ntty_unthrottle,
+        .throttle = ntty_throttle,
+        .chars_in_buffer = ntty_chars_in_buffer,
+        .tiocmget = ntty_tiocmget,
+        .tiocmset = ntty_tiocmset,
+        .get_icount = ntty_tiocgicount,
+        .install = ntty_install,
+        .cleanup = ntty_cleanup,
+};
+
+/* Module initialization */
+static struct pci_driver nozomi_driver = {
+        .name = NOZOMI_NAME,
+        .id_table = nozomi_pci_tbl,
+        .probe = nozomi_card_init,
+        .remove = __devexit_p(nozomi_card_exit),
+};
+
+static __init int nozomi_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Initializing %s\n", VERSION_STRING);
+
+        ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
+        if (!ntty_driver)
+                return -ENOMEM;
+
+        ntty_driver->owner = THIS_MODULE;
+        ntty_driver->driver_name = NOZOMI_NAME_TTY;
+        ntty_driver->name = "noz";
+        ntty_driver->major = 0;
+        ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        ntty_driver->subtype = SERIAL_TYPE_NORMAL;
+        ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        ntty_driver->init_termios = tty_std_termios;
+        ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
+                                                HUPCL | CLOCAL;
+        ntty_driver->init_termios.c_ispeed = 115200;
+        ntty_driver->init_termios.c_ospeed = 115200;
+        tty_set_operations(ntty_driver, &tty_ops);
+
+        ret = tty_register_driver(ntty_driver);
+        if (ret) {
+                printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
+                goto free_tty;
+        }
+
+        ret = pci_register_driver(&nozomi_driver);
+        if (ret) {
+                printk(KERN_ERR "Nozomi: can't register pci driver\n");
+                goto unr_tty;
+        }
+
+        return 0;
+unr_tty:
+        tty_unregister_driver(ntty_driver);
+free_tty:
+        put_tty_driver(ntty_driver);
+        return ret;
+}
+
+static __exit void nozomi_exit(void)
+{
+        printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
+        pci_unregister_driver(&nozomi_driver);
+        tty_unregister_driver(ntty_driver);
+        put_tty_driver(ntty_driver);
+}
+
+module_init(nozomi_init);
+module_exit(nozomi_exit);
+
+module_param(debug, int, S_IRUGO | S_IWUSR);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
new file mode 100644
index 000000000000..98b6e3bdb000
--- /dev/null
+++ b/drivers/tty/pty.c
@@ -0,0 +1,777 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  Added support for a Unix98-style ptmx device.
+ *    -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
+ *
+ *  When reading this code see also fs/devpts. In particular note that the
+ *  driver_data field is used by the devpts side as a binding to the devpts
+ *  inode.
+ */
+
+#include <linux/module.h>
+
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/fcntl.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <linux/device.h>
+#include <linux/uaccess.h>
+#include <linux/bitops.h>
+#include <linux/devpts_fs.h>
+#include <linux/slab.h>
+
+#include <asm/system.h>
+
+#ifdef CONFIG_UNIX98_PTYS
+static struct tty_driver *ptm_driver;
+static struct tty_driver *pts_driver;
+#endif
+
+static void pty_close(struct tty_struct *tty, struct file *filp)
+{
+        BUG_ON(!tty);
+        if (tty->driver->subtype == PTY_TYPE_MASTER)
+                WARN_ON(tty->count > 1);
+        else {
+                if (tty->count > 2)
+                        return;
+        }
+        wake_up_interruptible(&tty->read_wait);
+        wake_up_interruptible(&tty->write_wait);
+        tty->packet = 0;
+        if (!tty->link)
+                return;
+        tty->link->packet = 0;
+        set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
+        wake_up_interruptible(&tty->link->read_wait);
+        wake_up_interruptible(&tty->link->write_wait);
+        if (tty->driver->subtype == PTY_TYPE_MASTER) {
+                set_bit(TTY_OTHER_CLOSED, &tty->flags);
+#ifdef CONFIG_UNIX98_PTYS
+                if (tty->driver == ptm_driver)
+                        devpts_pty_kill(tty->link);
+#endif
+                tty_unlock();
+                tty_vhangup(tty->link);
+                tty_lock();
+        }
+}
+
+/*
+ * The unthrottle routine is called by the line discipline to signal
+ * that it can receive more characters.  For PTY's, the TTY_THROTTLED
+ * flag is always set, to force the line discipline to always call the
+ * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
+ * characters in the queue.  This is necessary since each time this
+ * happens, we need to wake up any sleeping processes that could be
+ * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
+ * for the pty buffer to be drained.
+ */
+static void pty_unthrottle(struct tty_struct *tty)
+{
+        tty_wakeup(tty->link);
+        set_bit(TTY_THROTTLED, &tty->flags);
+}
+
+/**
+ *      pty_space       -       report space left for writing
+ *      @to: tty we are writing into
+ *
+ *      The tty buffers allow 64K but we sneak a peak and clip at 8K this
+ *      allows a lot of overspill room for echo and other fun messes to
+ *      be handled properly
+ */
+
+static int pty_space(struct tty_struct *to)
+{
+        int n = 8192 - to->buf.memory_used;
+        if (n < 0)
+                return 0;
+        return n;
+}
+
+/**
+ *      pty_write               -       write to a pty
+ *      @tty: the tty we write from
+ *      @buf: kernel buffer of data
+ *      @count: bytes to write
+ *
+ *      Our "hardware" write method. Data is coming from the ldisc which
+ *      may be in a non sleeping state. We simply throw this at the other
+ *      end of the link as if we were an IRQ handler receiving stuff for
+ *      the other side of the pty/tty pair.
+ */
+
+static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
+{
+        struct tty_struct *to = tty->link;
+
+        if (tty->stopped)
+                return 0;
+
+        if (c > 0) {
+                /* Stuff the data into the input queue of the other end */
+                c = tty_insert_flip_string(to, buf, c);
+                /* And shovel */
+                if (c) {
+                        tty_flip_buffer_push(to);
+                        tty_wakeup(tty);
+                }
+        }
+        return c;
+}
+
+/**
+ *      pty_write_room  -       write space
+ *      @tty: tty we are writing from
+ *
+ *      Report how many bytes the ldisc can send into the queue for
+ *      the other device.
+ */
+
+static int pty_write_room(struct tty_struct *tty)
+{
+        if (tty->stopped)
+                return 0;
+        return pty_space(tty->link);
+}
+
+/**
+ *      pty_chars_in_buffer     -       characters currently in our tx queue
+ *      @tty: our tty
+ *
+ *      Report how much we have in the transmit queue. As everything is
+ *      instantly at the other end this is easy to implement.
+ */
+
+static int pty_chars_in_buffer(struct tty_struct *tty)
+{
+        return 0;
+}
+
+/* Set the lock flag on a pty */
+static int pty_set_lock(struct tty_struct *tty, int __user *arg)
+{
+        int val;
+        if (get_user(val, arg))
+                return -EFAULT;
+        if (val)
+                set_bit(TTY_PTY_LOCK, &tty->flags);
+        else
+                clear_bit(TTY_PTY_LOCK, &tty->flags);
+        return 0;
+}
+
+/* Send a signal to the slave */
+static int pty_signal(struct tty_struct *tty, int sig)
+{
+        unsigned long flags;
+        struct pid *pgrp;
+
+        if (tty->link) {
+                spin_lock_irqsave(&tty->link->ctrl_lock, flags);
+                pgrp = get_pid(tty->link->pgrp);
+                spin_unlock_irqrestore(&tty->link->ctrl_lock, flags);
+
+                kill_pgrp(pgrp, sig, 1);
+                put_pid(pgrp);
+        }
+        return 0;
+}
+
+static void pty_flush_buffer(struct tty_struct *tty)
+{
+        struct tty_struct *to = tty->link;
+        unsigned long flags;
+
+        if (!to)
+                return;
+        /* tty_buffer_flush(to); FIXME */
+        if (to->packet) {
+                spin_lock_irqsave(&tty->ctrl_lock, flags);
+                tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
+                wake_up_interruptible(&to->read_wait);
+                spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+        }
+}
+
+static int pty_open(struct tty_struct *tty, struct file *filp)
+{
+        int     retval = -ENODEV;
+
+        if (!tty || !tty->link)
+                goto out;
+
+        retval = -EIO;
+        if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
+                goto out;
+        if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
+                goto out;
+        if (tty->link->count != 1)
+                goto out;
+
+        clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
+        set_bit(TTY_THROTTLED, &tty->flags);
+        retval = 0;
+out:
+        return retval;
+}
+
+static void pty_set_termios(struct tty_struct *tty,
+                                        struct ktermios *old_termios)
+{
+        tty->termios->c_cflag &= ~(CSIZE | PARENB);
+        tty->termios->c_cflag |= (CS8 | CREAD);
+}
+
+/**
+ *      pty_do_resize           -       resize event
+ *      @tty: tty being resized
+ *      @ws: window size being set.
+ *
+ *      Update the termios variables and send the necessary signals to
+ *      peform a terminal resize correctly
+ */
+
+int pty_resize(struct tty_struct *tty,  struct winsize *ws)
+{
+        struct pid *pgrp, *rpgrp;
+        unsigned long flags;
+        struct tty_struct *pty = tty->link;
+
+        /* For a PTY we need to lock the tty side */
+        mutex_lock(&tty->termios_mutex);
+        if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
+                goto done;
+
+        /* Get the PID values and reference them so we can
+           avoid holding the tty ctrl lock while sending signals.
+           We need to lock these individually however. */
+
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        pgrp = get_pid(tty->pgrp);
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+
+        spin_lock_irqsave(&pty->ctrl_lock, flags);
+        rpgrp = get_pid(pty->pgrp);
+        spin_unlock_irqrestore(&pty->ctrl_lock, flags);
+
+        if (pgrp)
+                kill_pgrp(pgrp, SIGWINCH, 1);
+        if (rpgrp != pgrp && rpgrp)
+                kill_pgrp(rpgrp, SIGWINCH, 1);
+
+        put_pid(pgrp);
+        put_pid(rpgrp);
+
+        tty->winsize = *ws;
+        pty->winsize = *ws;     /* Never used so will go away soon */
+done:
+        mutex_unlock(&tty->termios_mutex);
+        return 0;
+}
+
+/* Traditional BSD devices */
+#ifdef CONFIG_LEGACY_PTYS
+
+static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+        struct tty_struct *o_tty;
+        int idx = tty->index;
+        int retval;
+
+        o_tty = alloc_tty_struct();
+        if (!o_tty)
+                return -ENOMEM;
+        if (!try_module_get(driver->other->owner)) {
+                /* This cannot in fact currently happen */
+                retval = -ENOMEM;
+                goto err_free_tty;
+        }
+        initialize_tty_struct(o_tty, driver->other, idx);
+
+        /* We always use new tty termios data so we can do this
+           the easy way .. */
+        retval = tty_init_termios(tty);
+        if (retval)
+                goto err_deinit_tty;
+
+        retval = tty_init_termios(o_tty);
+        if (retval)
+                goto err_free_termios;
+
+        /*
+         * Everything allocated ... set up the o_tty structure.
+         */
+        driver->other->ttys[idx] = o_tty;
+        tty_driver_kref_get(driver->other);
+        if (driver->subtype == PTY_TYPE_MASTER)
+                o_tty->count++;
+        /* Establish the links in both directions */
+        tty->link   = o_tty;
+        o_tty->link = tty;
+
+        tty_driver_kref_get(driver);
+        tty->count++;
+        driver->ttys[idx] = tty;
+        return 0;
+err_free_termios:
+        tty_free_termios(tty);
+err_deinit_tty:
+        deinitialize_tty_struct(o_tty);
+        module_put(o_tty->driver->owner);
+err_free_tty:
+        free_tty_struct(o_tty);
+        return retval;
+}
+
+static int pty_bsd_ioctl(struct tty_struct *tty,
+                         unsigned int cmd, unsigned long arg)
+{
+        switch (cmd) {
+        case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
+                return pty_set_lock(tty, (int __user *) arg);
+        case TIOCSIG:    /* Send signal to other side of pty */
+                return pty_signal(tty, (int) arg);
+        }
+        return -ENOIOCTLCMD;
+}
+
+static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
+module_param(legacy_count, int, 0);
+
+/*
+ * The master side of a pty can do TIOCSPTLCK and thus
+ * has pty_bsd_ioctl.
+ */
+static const struct tty_operations master_pty_ops_bsd = {
+        .install = pty_install,
+        .open = pty_open,
+        .close = pty_close,
+        .write = pty_write,
+        .write_room = pty_write_room,
+        .flush_buffer = pty_flush_buffer,
+        .chars_in_buffer = pty_chars_in_buffer,
+        .unthrottle = pty_unthrottle,
+        .set_termios = pty_set_termios,
+        .ioctl = pty_bsd_ioctl,
+        .resize = pty_resize
+};
+
+static const struct tty_operations slave_pty_ops_bsd = {
+        .install = pty_install,
+        .open = pty_open,
+        .close = pty_close,
+        .write = pty_write,
+        .write_room = pty_write_room,
+        .flush_buffer = pty_flush_buffer,
+        .chars_in_buffer = pty_chars_in_buffer,
+        .unthrottle = pty_unthrottle,
+        .set_termios = pty_set_termios,
+        .resize = pty_resize
+};
+
+static void __init legacy_pty_init(void)
+{
+        struct tty_driver *pty_driver, *pty_slave_driver;
+
+        if (legacy_count <= 0)
+                return;
+
+        pty_driver = alloc_tty_driver(legacy_count);
+        if (!pty_driver)
+                panic("Couldn't allocate pty driver");
+
+        pty_slave_driver = alloc_tty_driver(legacy_count);
+        if (!pty_slave_driver)
+                panic("Couldn't allocate pty slave driver");
+
+        pty_driver->owner = THIS_MODULE;
+        pty_driver->driver_name = "pty_master";
+        pty_driver->name = "pty";
+        pty_driver->major = PTY_MASTER_MAJOR;
+        pty_driver->minor_start = 0;
+        pty_driver->type = TTY_DRIVER_TYPE_PTY;
+        pty_driver->subtype = PTY_TYPE_MASTER;
+        pty_driver->init_termios = tty_std_termios;
+        pty_driver->init_termios.c_iflag = 0;
+        pty_driver->init_termios.c_oflag = 0;
+        pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
+        pty_driver->init_termios.c_lflag = 0;
+        pty_driver->init_termios.c_ispeed = 38400;
+        pty_driver->init_termios.c_ospeed = 38400;
+        pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW;
+        pty_driver->other = pty_slave_driver;
+        tty_set_operations(pty_driver, &master_pty_ops_bsd);
+
+        pty_slave_driver->owner = THIS_MODULE;
+        pty_slave_driver->driver_name = "pty_slave";
+        pty_slave_driver->name = "ttyp";
+        pty_slave_driver->major = PTY_SLAVE_MAJOR;
+        pty_slave_driver->minor_start = 0;
+        pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
+        pty_slave_driver->subtype = PTY_TYPE_SLAVE;
+        pty_slave_driver->init_termios = tty_std_termios;
+        pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
+        pty_slave_driver->init_termios.c_ispeed = 38400;
+        pty_slave_driver->init_termios.c_ospeed = 38400;
+        pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS |
+                                        TTY_DRIVER_REAL_RAW;
+        pty_slave_driver->other = pty_driver;
+        tty_set_operations(pty_slave_driver, &slave_pty_ops_bsd);
+
+        if (tty_register_driver(pty_driver))
+                panic("Couldn't register pty driver");
+        if (tty_register_driver(pty_slave_driver))
+                panic("Couldn't register pty slave driver");
+}
+#else
+static inline void legacy_pty_init(void) { }
+#endif
+
+/* Unix98 devices */
+#ifdef CONFIG_UNIX98_PTYS
+/*
+ * sysctl support for setting limits on the number of Unix98 ptys allocated.
+ * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
+ */
+int pty_limit = NR_UNIX98_PTY_DEFAULT;
+static int pty_limit_min;
+static int pty_limit_max = NR_UNIX98_PTY_MAX;
+static int pty_count;
+
+static struct cdev ptmx_cdev;
+
+static struct ctl_table pty_table[] = {
+        {
+                .procname       = "max",
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .data           = &pty_limit,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &pty_limit_min,
+                .extra2         = &pty_limit_max,
+        }, {
+                .procname       = "nr",
+                .maxlen         = sizeof(int),
+                .mode           = 0444,
+                .data           = &pty_count,
+                .proc_handler   = proc_dointvec,
+        }, 
+        {}
+};
+
+static struct ctl_table pty_kern_table[] = {
+        {
+                .procname       = "pty",
+                .mode           = 0555,
+                .child          = pty_table,
+        },
+        {}
+};
+
+static struct ctl_table pty_root_table[] = {
+        {
+                .procname       = "kernel",
+                .mode           = 0555,
+                .child          = pty_kern_table,
+        },
+        {}
+};
+
+
+static int pty_unix98_ioctl(struct tty_struct *tty,
+                            unsigned int cmd, unsigned long arg)
+{
+        switch (cmd) {
+        case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
+                return pty_set_lock(tty, (int __user *)arg);
+        case TIOCGPTN: /* Get PT Number */
+                return put_user(tty->index, (unsigned int __user *)arg);
+        case TIOCSIG:    /* Send signal to other side of pty */
+                return pty_signal(tty, (int) arg);
+        }
+
+        return -ENOIOCTLCMD;
+}
+
+/**
+ *      ptm_unix98_lookup       -       find a pty master
+ *      @driver: ptm driver
+ *      @idx: tty index
+ *
+ *      Look up a pty master device. Called under the tty_mutex for now.
+ *      This provides our locking.
+ */
+
+static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
+                struct inode *ptm_inode, int idx)
+{
+        struct tty_struct *tty = devpts_get_tty(ptm_inode, idx);
+        if (tty)
+                tty = tty->link;
+        return tty;
+}
+
+/**
+ *      pts_unix98_lookup       -       find a pty slave
+ *      @driver: pts driver
+ *      @idx: tty index
+ *
+ *      Look up a pty master device. Called under the tty_mutex for now.
+ *      This provides our locking.
+ */
+
+static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
+                struct inode *pts_inode, int idx)
+{
+        struct tty_struct *tty = devpts_get_tty(pts_inode, idx);
+        /* Master must be open before slave */
+        if (!tty)
+                return ERR_PTR(-EIO);
+        return tty;
+}
+
+static void pty_unix98_shutdown(struct tty_struct *tty)
+{
+        /* We have our own method as we don't use the tty index */
+        kfree(tty->termios);
+}
+
+/* We have no need to install and remove our tty objects as devpts does all
+   the work for us */
+
+static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+        struct tty_struct *o_tty;
+        int idx = tty->index;
+
+        o_tty = alloc_tty_struct();
+        if (!o_tty)
+                return -ENOMEM;
+        if (!try_module_get(driver->other->owner)) {
+                /* This cannot in fact currently happen */
+                goto err_free_tty;
+        }
+        initialize_tty_struct(o_tty, driver->other, idx);
+
+        tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
+        if (tty->termios == NULL)
+                goto err_free_mem;
+        *tty->termios = driver->init_termios;
+        tty->termios_locked = tty->termios + 1;
+
+        o_tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
+        if (o_tty->termios == NULL)
+                goto err_free_mem;
+        *o_tty->termios = driver->other->init_termios;
+        o_tty->termios_locked = o_tty->termios + 1;
+
+        tty_driver_kref_get(driver->other);
+        if (driver->subtype == PTY_TYPE_MASTER)
+                o_tty->count++;
+        /* Establish the links in both directions */
+        tty->link   = o_tty;
+        o_tty->link = tty;
+        /*
+         * All structures have been allocated, so now we install them.
+         * Failures after this point use release_tty to clean up, so
+         * there's no need to null out the local pointers.
+         */
+        tty_driver_kref_get(driver);
+        tty->count++;
+        pty_count++;
+        return 0;
+err_free_mem:
+        deinitialize_tty_struct(o_tty);
+        kfree(o_tty->termios);
+        kfree(tty->termios);
+        module_put(o_tty->driver->owner);
+err_free_tty:
+        free_tty_struct(o_tty);
+        return -ENOMEM;
+}
+
+static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
+{
+        pty_count--;
+}
+
+static const struct tty_operations ptm_unix98_ops = {
+        .lookup = ptm_unix98_lookup,
+        .install = pty_unix98_install,
+        .remove = pty_unix98_remove,
+        .open = pty_open,
+        .close = pty_close,
+        .write = pty_write,
+        .write_room = pty_write_room,
+        .flush_buffer = pty_flush_buffer,
+        .chars_in_buffer = pty_chars_in_buffer,
+        .unthrottle = pty_unthrottle,
+        .set_termios = pty_set_termios,
+        .ioctl = pty_unix98_ioctl,
+        .shutdown = pty_unix98_shutdown,
+        .resize = pty_resize
+};
+
+static const struct tty_operations pty_unix98_ops = {
+        .lookup = pts_unix98_lookup,
+        .install = pty_unix98_install,
+        .remove = pty_unix98_remove,
+        .open = pty_open,
+        .close = pty_close,
+        .write = pty_write,
+        .write_room = pty_write_room,
+        .flush_buffer = pty_flush_buffer,
+        .chars_in_buffer = pty_chars_in_buffer,
+        .unthrottle = pty_unthrottle,
+        .set_termios = pty_set_termios,
+        .shutdown = pty_unix98_shutdown
+};
+
+/**
+ *      ptmx_open               -       open a unix 98 pty master
+ *      @inode: inode of device file
+ *      @filp: file pointer to tty
+ *
+ *      Allocate a unix98 pty master device from the ptmx driver.
+ *
+ *      Locking: tty_mutex protects the init_dev work. tty->count should
+ *              protect the rest.
+ *              allocated_ptys_lock handles the list of free pty numbers
+ */
+
+static int ptmx_open(struct inode *inode, struct file *filp)
+{
+        struct tty_struct *tty;
+        int retval;
+        int index;
+
+        nonseekable_open(inode, filp);
+
+        /* find a device that is not in use. */
+        tty_lock();
+        index = devpts_new_index(inode);
+        tty_unlock();
+        if (index < 0)
+                return index;
+
+        mutex_lock(&tty_mutex);
+        tty_lock();
+        tty = tty_init_dev(ptm_driver, index, 1);
+        mutex_unlock(&tty_mutex);
+
+        if (IS_ERR(tty)) {
+                retval = PTR_ERR(tty);
+                goto out;
+        }
+
+        set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
+
+        retval = tty_add_file(tty, filp);
+        if (retval)
+                goto out;
+
+        retval = devpts_pty_new(inode, tty->link);
+        if (retval)
+                goto out1;
+
+        retval = ptm_driver->ops->open(tty, filp);
+        if (retval)
+                goto out2;
+out1:
+        tty_unlock();
+        return retval;
+out2:
+        tty_unlock();
+        tty_release(inode, filp);
+        return retval;
+out:
+        devpts_kill_index(inode, index);
+        tty_unlock();
+        return retval;
+}
+
+static struct file_operations ptmx_fops;
+
+static void __init unix98_pty_init(void)
+{
+        ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
+        if (!ptm_driver)
+                panic("Couldn't allocate Unix98 ptm driver");
+        pts_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
+        if (!pts_driver)
+                panic("Couldn't allocate Unix98 pts driver");
+
+        ptm_driver->owner = THIS_MODULE;
+        ptm_driver->driver_name = "pty_master";
+        ptm_driver->name = "ptm";
+        ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
+        ptm_driver->minor_start = 0;
+        ptm_driver->type = TTY_DRIVER_TYPE_PTY;
+        ptm_driver->subtype = PTY_TYPE_MASTER;
+        ptm_driver->init_termios = tty_std_termios;
+        ptm_driver->init_termios.c_iflag = 0;
+        ptm_driver->init_termios.c_oflag = 0;
+        ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
+        ptm_driver->init_termios.c_lflag = 0;
+        ptm_driver->init_termios.c_ispeed = 38400;
+        ptm_driver->init_termios.c_ospeed = 38400;
+        ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
+                TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
+        ptm_driver->other = pts_driver;
+        tty_set_operations(ptm_driver, &ptm_unix98_ops);
+
+        pts_driver->owner = THIS_MODULE;
+        pts_driver->driver_name = "pty_slave";
+        pts_driver->name = "pts";
+        pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
+        pts_driver->minor_start = 0;
+        pts_driver->type = TTY_DRIVER_TYPE_PTY;
+        pts_driver->subtype = PTY_TYPE_SLAVE;
+        pts_driver->init_termios = tty_std_termios;
+        pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
+        pts_driver->init_termios.c_ispeed = 38400;
+        pts_driver->init_termios.c_ospeed = 38400;
+        pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
+                TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
+        pts_driver->other = ptm_driver;
+        tty_set_operations(pts_driver, &pty_unix98_ops);
+
+        if (tty_register_driver(ptm_driver))
+                panic("Couldn't register Unix98 ptm driver");
+        if (tty_register_driver(pts_driver))
+                panic("Couldn't register Unix98 pts driver");
+
+        register_sysctl_table(pty_root_table);
+
+        /* Now create the /dev/ptmx special device */
+        tty_default_fops(&ptmx_fops);
+        ptmx_fops.open = ptmx_open;
+
+        cdev_init(&ptmx_cdev, &ptmx_fops);
+        if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
+            register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
+                panic("Couldn't register /dev/ptmx driver\n");
+        device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
+}
+
+#else
+static inline void unix98_pty_init(void) { }
+#endif
+
+static int __init pty_init(void)
+{
+        legacy_pty_init();
+        unix98_pty_init();
+        return 0;
+}
+module_init(pty_init);
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
new file mode 100644
index 000000000000..13043e8d37fe
--- /dev/null
+++ b/drivers/tty/rocket.c
@@ -0,0 +1,3152 @@
+/*
+ * RocketPort device driver for Linux
+ *
+ * Written by Theodore Ts'o, 1995, 1996, 1997, 1998, 1999, 2000.
+ * 
+ * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2003 by Comtrol, Inc.
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * Kernel Synchronization:
+ *
+ * This driver has 2 kernel control paths - exception handlers (calls into the driver
+ * from user mode) and the timer bottom half (tasklet).  This is a polled driver, interrupts
+ * are not used.
+ *
+ * Critical data: 
+ * -  rp_table[], accessed through passed "info" pointers, is a global (static) array of 
+ *    serial port state information and the xmit_buf circular buffer.  Protected by 
+ *    a per port spinlock.
+ * -  xmit_flags[], an array of ints indexed by line (port) number, indicating that there
+ *    is data to be transmitted.  Protected by atomic bit operations.
+ * -  rp_num_ports, int indicating number of open ports, protected by atomic operations.
+ * 
+ * rp_write() and rp_write_char() functions use a per port semaphore to protect against
+ * simultaneous access to the same port by more than one process.
+ */
+
+/****** Defines ******/
+#define ROCKET_PARANOIA_CHECK
+#define ROCKET_DISABLE_SIMUSAGE
+
+#undef ROCKET_SOFT_FLOW
+#undef ROCKET_DEBUG_OPEN
+#undef ROCKET_DEBUG_INTR
+#undef ROCKET_DEBUG_WRITE
+#undef ROCKET_DEBUG_FLOW
+#undef ROCKET_DEBUG_THROTTLE
+#undef ROCKET_DEBUG_WAIT_UNTIL_SENT
+#undef ROCKET_DEBUG_RECEIVE
+#undef ROCKET_DEBUG_HANGUP
+#undef REV_PCI_ORDER
+#undef ROCKET_DEBUG_IO
+
+#define POLL_PERIOD HZ/100      /*  Polling period .01 seconds (10ms) */
+
+/****** Kernel includes ******/
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/major.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/mutex.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/completion.h>
+#include <linux/wait.h>
+#include <linux/pci.h>
+#include <linux/uaccess.h>
+#include <asm/atomic.h>
+#include <asm/unaligned.h>
+#include <linux/bitops.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+
+/****** RocketPort includes ******/
+
+#include "rocket_int.h"
+#include "rocket.h"
+
+#define ROCKET_VERSION "2.09"
+#define ROCKET_DATE "12-June-2003"
+
+/****** RocketPort Local Variables ******/
+
+static void rp_do_poll(unsigned long dummy);
+
+static struct tty_driver *rocket_driver;
+
+static struct rocket_version driver_version = { 
+        ROCKET_VERSION, ROCKET_DATE
+};
+
+static struct r_port *rp_table[MAX_RP_PORTS];          /*  The main repository of serial port state information. */
+static unsigned int xmit_flags[NUM_BOARDS];            /*  Bit significant, indicates port had data to transmit. */
+                                                       /*  eg.  Bit 0 indicates port 0 has xmit data, ...        */
+static atomic_t rp_num_ports_open;                     /*  Number of serial ports open                           */
+static DEFINE_TIMER(rocket_timer, rp_do_poll, 0, 0);
+
+static unsigned long board1;                           /* ISA addresses, retrieved from rocketport.conf          */
+static unsigned long board2;
+static unsigned long board3;
+static unsigned long board4;
+static unsigned long controller;
+static int support_low_speed;
+static unsigned long modem1;
+static unsigned long modem2;
+static unsigned long modem3;
+static unsigned long modem4;
+static unsigned long pc104_1[8];
+static unsigned long pc104_2[8];
+static unsigned long pc104_3[8];
+static unsigned long pc104_4[8];
+static unsigned long *pc104[4] = { pc104_1, pc104_2, pc104_3, pc104_4 };
+
+static int rp_baud_base[NUM_BOARDS];                   /*  Board config info (Someday make a per-board structure)  */
+static unsigned long rcktpt_io_addr[NUM_BOARDS];
+static int rcktpt_type[NUM_BOARDS];
+static int is_PCI[NUM_BOARDS];
+static rocketModel_t rocketModel[NUM_BOARDS];
+static int max_board;
+static const struct tty_port_operations rocket_port_ops;
+
+/*
+ * The following arrays define the interrupt bits corresponding to each AIOP.
+ * These bits are different between the ISA and regular PCI boards and the
+ * Universal PCI boards.
+ */
+
+static Word_t aiop_intr_bits[AIOP_CTL_SIZE] = {
+        AIOP_INTR_BIT_0,
+        AIOP_INTR_BIT_1,
+        AIOP_INTR_BIT_2,
+        AIOP_INTR_BIT_3
+};
+
+static Word_t upci_aiop_intr_bits[AIOP_CTL_SIZE] = {
+        UPCI_AIOP_INTR_BIT_0,
+        UPCI_AIOP_INTR_BIT_1,
+        UPCI_AIOP_INTR_BIT_2,
+        UPCI_AIOP_INTR_BIT_3
+};
+
+static Byte_t RData[RDATASIZE] = {
+        0x00, 0x09, 0xf6, 0x82,
+        0x02, 0x09, 0x86, 0xfb,
+        0x04, 0x09, 0x00, 0x0a,
+        0x06, 0x09, 0x01, 0x0a,
+        0x08, 0x09, 0x8a, 0x13,
+        0x0a, 0x09, 0xc5, 0x11,
+        0x0c, 0x09, 0x86, 0x85,
+        0x0e, 0x09, 0x20, 0x0a,
+        0x10, 0x09, 0x21, 0x0a,
+        0x12, 0x09, 0x41, 0xff,
+        0x14, 0x09, 0x82, 0x00,
+        0x16, 0x09, 0x82, 0x7b,
+        0x18, 0x09, 0x8a, 0x7d,
+        0x1a, 0x09, 0x88, 0x81,
+        0x1c, 0x09, 0x86, 0x7a,
+        0x1e, 0x09, 0x84, 0x81,
+        0x20, 0x09, 0x82, 0x7c,
+        0x22, 0x09, 0x0a, 0x0a
+};
+
+static Byte_t RRegData[RREGDATASIZE] = {
+        0x00, 0x09, 0xf6, 0x82, /* 00: Stop Rx processor */
+        0x08, 0x09, 0x8a, 0x13, /* 04: Tx software flow control */
+        0x0a, 0x09, 0xc5, 0x11, /* 08: XON char */
+        0x0c, 0x09, 0x86, 0x85, /* 0c: XANY */
+        0x12, 0x09, 0x41, 0xff, /* 10: Rx mask char */
+        0x14, 0x09, 0x82, 0x00, /* 14: Compare/Ignore #0 */
+        0x16, 0x09, 0x82, 0x7b, /* 18: Compare #1 */
+        0x18, 0x09, 0x8a, 0x7d, /* 1c: Compare #2 */
+        0x1a, 0x09, 0x88, 0x81, /* 20: Interrupt #1 */
+        0x1c, 0x09, 0x86, 0x7a, /* 24: Ignore/Replace #1 */
+        0x1e, 0x09, 0x84, 0x81, /* 28: Interrupt #2 */
+        0x20, 0x09, 0x82, 0x7c, /* 2c: Ignore/Replace #2 */
+        0x22, 0x09, 0x0a, 0x0a  /* 30: Rx FIFO Enable */
+};
+
+static CONTROLLER_T sController[CTL_SIZE] = {
+        {-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
+         {0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}},
+        {-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
+         {0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}},
+        {-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
+         {0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}},
+        {-1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, {0, 0, 0, 0},
+         {0, 0, 0, 0}, {-1, -1, -1, -1}, {0, 0, 0, 0}}
+};
+
+static Byte_t sBitMapClrTbl[8] = {
+        0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f
+};
+
+static Byte_t sBitMapSetTbl[8] = {
+        0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80
+};
+
+static int sClockPrescale = 0x14;
+
+/*
+ *  Line number is the ttySIx number (x), the Minor number.  We 
+ *  assign them sequentially, starting at zero.  The following 
+ *  array keeps track of the line number assigned to a given board/aiop/channel.
+ */
+static unsigned char lineNumbers[MAX_RP_PORTS];
+static unsigned long nextLineNumber;
+
+/*****  RocketPort Static Prototypes   *********/
+static int __init init_ISA(int i);
+static void rp_wait_until_sent(struct tty_struct *tty, int timeout);
+static void rp_flush_buffer(struct tty_struct *tty);
+static void rmSpeakerReset(CONTROLLER_T * CtlP, unsigned long model);
+static unsigned char GetLineNumber(int ctrl, int aiop, int ch);
+static unsigned char SetLineNumber(int ctrl, int aiop, int ch);
+static void rp_start(struct tty_struct *tty);
+static int sInitChan(CONTROLLER_T * CtlP, CHANNEL_T * ChP, int AiopNum,
+                     int ChanNum);
+static void sSetInterfaceMode(CHANNEL_T * ChP, Byte_t mode);
+static void sFlushRxFIFO(CHANNEL_T * ChP);
+static void sFlushTxFIFO(CHANNEL_T * ChP);
+static void sEnInterrupts(CHANNEL_T * ChP, Word_t Flags);
+static void sDisInterrupts(CHANNEL_T * ChP, Word_t Flags);
+static void sModemReset(CONTROLLER_T * CtlP, int chan, int on);
+static void sPCIModemReset(CONTROLLER_T * CtlP, int chan, int on);
+static int sWriteTxPrioByte(CHANNEL_T * ChP, Byte_t Data);
+static int sPCIInitController(CONTROLLER_T * CtlP, int CtlNum,
+                              ByteIO_t * AiopIOList, int AiopIOListSize,
+                              WordIO_t ConfigIO, int IRQNum, Byte_t Frequency,
+                              int PeriodicOnly, int altChanRingIndicator,
+                              int UPCIRingInd);
+static int sInitController(CONTROLLER_T * CtlP, int CtlNum, ByteIO_t MudbacIO,
+                           ByteIO_t * AiopIOList, int AiopIOListSize,
+                           int IRQNum, Byte_t Frequency, int PeriodicOnly);
+static int sReadAiopID(ByteIO_t io);
+static int sReadAiopNumChan(WordIO_t io);
+
+MODULE_AUTHOR("Theodore Ts'o");
+MODULE_DESCRIPTION("Comtrol RocketPort driver");
+module_param(board1, ulong, 0);
+MODULE_PARM_DESC(board1, "I/O port for (ISA) board #1");
+module_param(board2, ulong, 0);
+MODULE_PARM_DESC(board2, "I/O port for (ISA) board #2");
+module_param(board3, ulong, 0);
+MODULE_PARM_DESC(board3, "I/O port for (ISA) board #3");
+module_param(board4, ulong, 0);
+MODULE_PARM_DESC(board4, "I/O port for (ISA) board #4");
+module_param(controller, ulong, 0);
+MODULE_PARM_DESC(controller, "I/O port for (ISA) rocketport controller");
+module_param(support_low_speed, bool, 0);
+MODULE_PARM_DESC(support_low_speed, "1 means support 50 baud, 0 means support 460400 baud");
+module_param(modem1, ulong, 0);
+MODULE_PARM_DESC(modem1, "1 means (ISA) board #1 is a RocketModem");
+module_param(modem2, ulong, 0);
+MODULE_PARM_DESC(modem2, "1 means (ISA) board #2 is a RocketModem");
+module_param(modem3, ulong, 0);
+MODULE_PARM_DESC(modem3, "1 means (ISA) board #3 is a RocketModem");
+module_param(modem4, ulong, 0);
+MODULE_PARM_DESC(modem4, "1 means (ISA) board #4 is a RocketModem");
+module_param_array(pc104_1, ulong, NULL, 0);
+MODULE_PARM_DESC(pc104_1, "set interface types for ISA(PC104) board #1 (e.g. pc104_1=232,232,485,485,...");
+module_param_array(pc104_2, ulong, NULL, 0);
+MODULE_PARM_DESC(pc104_2, "set interface types for ISA(PC104) board #2 (e.g. pc104_2=232,232,485,485,...");
+module_param_array(pc104_3, ulong, NULL, 0);
+MODULE_PARM_DESC(pc104_3, "set interface types for ISA(PC104) board #3 (e.g. pc104_3=232,232,485,485,...");
+module_param_array(pc104_4, ulong, NULL, 0);
+MODULE_PARM_DESC(pc104_4, "set interface types for ISA(PC104) board #4 (e.g. pc104_4=232,232,485,485,...");
+
+static int rp_init(void);
+static void rp_cleanup_module(void);
+
+module_init(rp_init);
+module_exit(rp_cleanup_module);
+
+
+MODULE_LICENSE("Dual BSD/GPL");
+
+/*************************************************************************/
+/*                     Module code starts here                           */
+
+static inline int rocket_paranoia_check(struct r_port *info,
+                                        const char *routine)
+{
+#ifdef ROCKET_PARANOIA_CHECK
+        if (!info)
+                return 1;
+        if (info->magic != RPORT_MAGIC) {
+                printk(KERN_WARNING "Warning: bad magic number for rocketport "
+                                "struct in %s\n", routine);
+                return 1;
+        }
+#endif
+        return 0;
+}
+
+
+/*  Serial port receive data function.  Called (from timer poll) when an AIOPIC signals 
+ *  that receive data is present on a serial port.  Pulls data from FIFO, moves it into the 
+ *  tty layer.  
+ */
+static void rp_do_receive(struct r_port *info,
+                          struct tty_struct *tty,
+                          CHANNEL_t * cp, unsigned int ChanStatus)
+{
+        unsigned int CharNStat;
+        int ToRecv, wRecv, space;
+        unsigned char *cbuf;
+
+        ToRecv = sGetRxCnt(cp);
+#ifdef ROCKET_DEBUG_INTR
+        printk(KERN_INFO "rp_do_receive(%d)...\n", ToRecv);
+#endif
+        if (ToRecv == 0)
+                return;
+
+        /*
+         * if status indicates there are errored characters in the
+         * FIFO, then enter status mode (a word in FIFO holds
+         * character and status).
+         */
+        if (ChanStatus & (RXFOVERFL | RXBREAK | RXFRAME | RXPARITY)) {
+                if (!(ChanStatus & STATMODE)) {
+#ifdef ROCKET_DEBUG_RECEIVE
+                        printk(KERN_INFO "Entering STATMODE...\n");
+#endif
+                        ChanStatus |= STATMODE;
+                        sEnRxStatusMode(cp);
+                }
+        }
+
+        /* 
+         * if we previously entered status mode, then read down the
+         * FIFO one word at a time, pulling apart the character and
+         * the status.  Update error counters depending on status
+         */
+        if (ChanStatus & STATMODE) {
+#ifdef ROCKET_DEBUG_RECEIVE
+                printk(KERN_INFO "Ignore %x, read %x...\n",
+                        info->ignore_status_mask, info->read_status_mask);
+#endif
+                while (ToRecv) {
+                        char flag;
+
+                        CharNStat = sInW(sGetTxRxDataIO(cp));
+#ifdef ROCKET_DEBUG_RECEIVE
+                        printk(KERN_INFO "%x...\n", CharNStat);
+#endif
+                        if (CharNStat & STMBREAKH)
+                                CharNStat &= ~(STMFRAMEH | STMPARITYH);
+                        if (CharNStat & info->ignore_status_mask) {
+                                ToRecv--;
+                                continue;
+                        }
+                        CharNStat &= info->read_status_mask;
+                        if (CharNStat & STMBREAKH)
+                                flag = TTY_BREAK;
+                        else if (CharNStat & STMPARITYH)
+                                flag = TTY_PARITY;
+                        else if (CharNStat & STMFRAMEH)
+                                flag = TTY_FRAME;
+                        else if (CharNStat & STMRCVROVRH)
+                                flag = TTY_OVERRUN;
+                        else
+                                flag = TTY_NORMAL;
+                        tty_insert_flip_char(tty, CharNStat & 0xff, flag);
+                        ToRecv--;
+                }
+
+                /*
+                 * after we've emptied the FIFO in status mode, turn
+                 * status mode back off
+                 */
+                if (sGetRxCnt(cp) == 0) {
+#ifdef ROCKET_DEBUG_RECEIVE
+                        printk(KERN_INFO "Status mode off.\n");
+#endif
+                        sDisRxStatusMode(cp);
+                }
+        } else {
+                /*
+                 * we aren't in status mode, so read down the FIFO two
+                 * characters at time by doing repeated word IO
+                 * transfer.
+                 */
+                space = tty_prepare_flip_string(tty, &cbuf, ToRecv);
+                if (space < ToRecv) {
+#ifdef ROCKET_DEBUG_RECEIVE
+                        printk(KERN_INFO "rp_do_receive:insufficient space ToRecv=%d space=%d\n", ToRecv, space);
+#endif
+                        if (space <= 0)
+                                return;
+                        ToRecv = space;
+                }
+                wRecv = ToRecv >> 1;
+                if (wRecv)
+                        sInStrW(sGetTxRxDataIO(cp), (unsigned short *) cbuf, wRecv);
+                if (ToRecv & 1)
+                        cbuf[ToRecv - 1] = sInB(sGetTxRxDataIO(cp));
+        }
+        /*  Push the data up to the tty layer */
+        tty_flip_buffer_push(tty);
+}
+
+/*
+ *  Serial port transmit data function.  Called from the timer polling loop as a 
+ *  result of a bit set in xmit_flags[], indicating data (from the tty layer) is ready
+ *  to be sent out the serial port.  Data is buffered in rp_table[line].xmit_buf, it is 
+ *  moved to the port's xmit FIFO.  *info is critical data, protected by spinlocks.
+ */
+static void rp_do_transmit(struct r_port *info)
+{
+        int c;
+        CHANNEL_t *cp = &info->channel;
+        struct tty_struct *tty;
+        unsigned long flags;
+
+#ifdef ROCKET_DEBUG_INTR
+        printk(KERN_DEBUG "%s\n", __func__);
+#endif
+        if (!info)
+                return;
+        tty = tty_port_tty_get(&info->port);
+
+        if (tty == NULL) {
+                printk(KERN_WARNING "rp: WARNING %s called with tty==NULL\n", __func__);
+                clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+                return;
+        }
+
+        spin_lock_irqsave(&info->slock, flags);
+        info->xmit_fifo_room = TXFIFO_SIZE - sGetTxCnt(cp);
+
+        /*  Loop sending data to FIFO until done or FIFO full */
+        while (1) {
+                if (tty->stopped || tty->hw_stopped)
+                        break;
+                c = min(info->xmit_fifo_room, info->xmit_cnt);
+                c = min(c, XMIT_BUF_SIZE - info->xmit_tail);
+                if (c <= 0 || info->xmit_fifo_room <= 0)
+                        break;
+                sOutStrW(sGetTxRxDataIO(cp), (unsigned short *) (info->xmit_buf + info->xmit_tail), c / 2);
+                if (c & 1)
+                        sOutB(sGetTxRxDataIO(cp), info->xmit_buf[info->xmit_tail + c - 1]);
+                info->xmit_tail += c;
+                info->xmit_tail &= XMIT_BUF_SIZE - 1;
+                info->xmit_cnt -= c;
+                info->xmit_fifo_room -= c;
+#ifdef ROCKET_DEBUG_INTR
+                printk(KERN_INFO "tx %d chars...\n", c);
+#endif
+        }
+
+        if (info->xmit_cnt == 0)
+                clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+
+        if (info->xmit_cnt < WAKEUP_CHARS) {
+                tty_wakeup(tty);
+#ifdef ROCKETPORT_HAVE_POLL_WAIT
+                wake_up_interruptible(&tty->poll_wait);
+#endif
+        }
+
+        spin_unlock_irqrestore(&info->slock, flags);
+        tty_kref_put(tty);
+
+#ifdef ROCKET_DEBUG_INTR
+        printk(KERN_DEBUG "(%d,%d,%d,%d)...\n", info->xmit_cnt, info->xmit_head,
+               info->xmit_tail, info->xmit_fifo_room);
+#endif
+}
+
+/*
+ *  Called when a serial port signals it has read data in it's RX FIFO.
+ *  It checks what interrupts are pending and services them, including
+ *  receiving serial data.  
+ */
+static void rp_handle_port(struct r_port *info)
+{
+        CHANNEL_t *cp;
+        struct tty_struct *tty;
+        unsigned int IntMask, ChanStatus;
+
+        if (!info)
+                return;
+
+        if ((info->port.flags & ASYNC_INITIALIZED) == 0) {
+                printk(KERN_WARNING "rp: WARNING: rp_handle_port called with "
+                                "info->flags & NOT_INIT\n");
+                return;
+        }
+        tty = tty_port_tty_get(&info->port);
+        if (!tty) {
+                printk(KERN_WARNING "rp: WARNING: rp_handle_port called with "
+                                "tty==NULL\n");
+                return;
+        }
+        cp = &info->channel;
+
+        IntMask = sGetChanIntID(cp) & info->intmask;
+#ifdef ROCKET_DEBUG_INTR
+        printk(KERN_INFO "rp_interrupt %02x...\n", IntMask);
+#endif
+        ChanStatus = sGetChanStatus(cp);
+        if (IntMask & RXF_TRIG) {       /* Rx FIFO trigger level */
+                rp_do_receive(info, tty, cp, ChanStatus);
+        }
+        if (IntMask & DELTA_CD) {       /* CD change  */
+#if (defined(ROCKET_DEBUG_OPEN) || defined(ROCKET_DEBUG_INTR) || defined(ROCKET_DEBUG_HANGUP))
+                printk(KERN_INFO "ttyR%d CD now %s...\n", info->line,
+                       (ChanStatus & CD_ACT) ? "on" : "off");
+#endif
+                if (!(ChanStatus & CD_ACT) && info->cd_status) {
+#ifdef ROCKET_DEBUG_HANGUP
+                        printk(KERN_INFO "CD drop, calling hangup.\n");
+#endif
+                        tty_hangup(tty);
+                }
+                info->cd_status = (ChanStatus & CD_ACT) ? 1 : 0;
+                wake_up_interruptible(&info->port.open_wait);
+        }
+#ifdef ROCKET_DEBUG_INTR
+        if (IntMask & DELTA_CTS) {      /* CTS change */
+                printk(KERN_INFO "CTS change...\n");
+        }
+        if (IntMask & DELTA_DSR) {      /* DSR change */
+                printk(KERN_INFO "DSR change...\n");
+        }
+#endif
+        tty_kref_put(tty);
+}
+
+/*
+ *  The top level polling routine.  Repeats every 1/100 HZ (10ms).
+ */
+static void rp_do_poll(unsigned long dummy)
+{
+        CONTROLLER_t *ctlp;
+        int ctrl, aiop, ch, line;
+        unsigned int xmitmask, i;
+        unsigned int CtlMask;
+        unsigned char AiopMask;
+        Word_t bit;
+
+        /*  Walk through all the boards (ctrl's) */
+        for (ctrl = 0; ctrl < max_board; ctrl++) {
+                if (rcktpt_io_addr[ctrl] <= 0)
+                        continue;
+
+                /*  Get a ptr to the board's control struct */
+                ctlp = sCtlNumToCtlPtr(ctrl);
+
+                /*  Get the interrupt status from the board */
+#ifdef CONFIG_PCI
+                if (ctlp->BusType == isPCI)
+                        CtlMask = sPCIGetControllerIntStatus(ctlp);
+                else
+#endif
+                        CtlMask = sGetControllerIntStatus(ctlp);
+
+                /*  Check if any AIOP read bits are set */
+                for (aiop = 0; CtlMask; aiop++) {
+                        bit = ctlp->AiopIntrBits[aiop];
+                        if (CtlMask & bit) {
+                                CtlMask &= ~bit;
+                                AiopMask = sGetAiopIntStatus(ctlp, aiop);
+
+                                /*  Check if any port read bits are set */
+                                for (ch = 0; AiopMask;  AiopMask >>= 1, ch++) {
+                                        if (AiopMask & 1) {
+
+                                                /*  Get the line number (/dev/ttyRx number). */
+                                                /*  Read the data from the port. */
+                                                line = GetLineNumber(ctrl, aiop, ch);
+                                                rp_handle_port(rp_table[line]);
+                                        }
+                                }
+                        }
+                }
+
+                xmitmask = xmit_flags[ctrl];
+
+                /*
+                 *  xmit_flags contains bit-significant flags, indicating there is data
+                 *  to xmit on the port. Bit 0 is port 0 on this board, bit 1 is port 
+                 *  1, ... (32 total possible).  The variable i has the aiop and ch 
+                 *  numbers encoded in it (port 0-7 are aiop0, 8-15 are aiop1, etc).
+                 */
+                if (xmitmask) {
+                        for (i = 0; i < rocketModel[ctrl].numPorts; i++) {
+                                if (xmitmask & (1 << i)) {
+                                        aiop = (i & 0x18) >> 3;
+                                        ch = i & 0x07;
+                                        line = GetLineNumber(ctrl, aiop, ch);
+                                        rp_do_transmit(rp_table[line]);
+                                }
+                        }
+                }
+        }
+
+        /*
+         * Reset the timer so we get called at the next clock tick (10ms).
+         */
+        if (atomic_read(&rp_num_ports_open))
+                mod_timer(&rocket_timer, jiffies + POLL_PERIOD);
+}
+
+/*
+ *  Initializes the r_port structure for a port, as well as enabling the port on 
+ *  the board.  
+ *  Inputs:  board, aiop, chan numbers
+ */
+static void init_r_port(int board, int aiop, int chan, struct pci_dev *pci_dev)
+{
+        unsigned rocketMode;
+        struct r_port *info;
+        int line;
+        CONTROLLER_T *ctlp;
+
+        /*  Get the next available line number */
+        line = SetLineNumber(board, aiop, chan);
+
+        ctlp = sCtlNumToCtlPtr(board);
+
+        /*  Get a r_port struct for the port, fill it in and save it globally, indexed by line number */
+        info = kzalloc(sizeof (struct r_port), GFP_KERNEL);
+        if (!info) {
+                printk(KERN_ERR "Couldn't allocate info struct for line #%d\n",
+                                line);
+                return;
+        }
+
+        info->magic = RPORT_MAGIC;
+        info->line = line;
+        info->ctlp = ctlp;
+        info->board = board;
+        info->aiop = aiop;
+        info->chan = chan;
+        tty_port_init(&info->port);
+        info->port.ops = &rocket_port_ops;
+        init_completion(&info->close_wait);
+        info->flags &= ~ROCKET_MODE_MASK;
+        switch (pc104[board][line]) {
+        case 422:
+                info->flags |= ROCKET_MODE_RS422;
+                break;
+        case 485:
+                info->flags |= ROCKET_MODE_RS485;
+                break;
+        case 232:
+        default:
+                info->flags |= ROCKET_MODE_RS232;
+                break;
+        }
+
+        info->intmask = RXF_TRIG | TXFIFO_MT | SRC_INT | DELTA_CD | DELTA_CTS | DELTA_DSR;
+        if (sInitChan(ctlp, &info->channel, aiop, chan) == 0) {
+                printk(KERN_ERR "RocketPort sInitChan(%d, %d, %d) failed!\n",
+                                board, aiop, chan);
+                kfree(info);
+                return;
+        }
+
+        rocketMode = info->flags & ROCKET_MODE_MASK;
+
+        if ((info->flags & ROCKET_RTS_TOGGLE) || (rocketMode == ROCKET_MODE_RS485))
+                sEnRTSToggle(&info->channel);
+        else
+                sDisRTSToggle(&info->channel);
+
+        if (ctlp->boardType == ROCKET_TYPE_PC104) {
+                switch (rocketMode) {
+                case ROCKET_MODE_RS485:
+                        sSetInterfaceMode(&info->channel, InterfaceModeRS485);
+                        break;
+                case ROCKET_MODE_RS422:
+                        sSetInterfaceMode(&info->channel, InterfaceModeRS422);
+                        break;
+                case ROCKET_MODE_RS232:
+                default:
+                        if (info->flags & ROCKET_RTS_TOGGLE)
+                                sSetInterfaceMode(&info->channel, InterfaceModeRS232T);
+                        else
+                                sSetInterfaceMode(&info->channel, InterfaceModeRS232);
+                        break;
+                }
+        }
+        spin_lock_init(&info->slock);
+        mutex_init(&info->write_mtx);
+        rp_table[line] = info;
+        tty_register_device(rocket_driver, line, pci_dev ? &pci_dev->dev :
+                        NULL);
+}
+
+/*
+ *  Configures a rocketport port according to its termio settings.  Called from 
+ *  user mode into the driver (exception handler).  *info CD manipulation is spinlock protected.
+ */
+static void configure_r_port(struct tty_struct *tty, struct r_port *info,
+                             struct ktermios *old_termios)
+{
+        unsigned cflag;
+        unsigned long flags;
+        unsigned rocketMode;
+        int bits, baud, divisor;
+        CHANNEL_t *cp;
+        struct ktermios *t = tty->termios;
+
+        cp = &info->channel;
+        cflag = t->c_cflag;
+
+        /* Byte size and parity */
+        if ((cflag & CSIZE) == CS8) {
+                sSetData8(cp);
+                bits = 10;
+        } else {
+                sSetData7(cp);
+                bits = 9;
+        }
+        if (cflag & CSTOPB) {
+                sSetStop2(cp);
+                bits++;
+        } else {
+                sSetStop1(cp);
+        }
+
+        if (cflag & PARENB) {
+                sEnParity(cp);
+                bits++;
+                if (cflag & PARODD) {
+                        sSetOddParity(cp);
+                } else {
+                        sSetEvenParity(cp);
+                }
+        } else {
+                sDisParity(cp);
+        }
+
+        /* baud rate */
+        baud = tty_get_baud_rate(tty);
+        if (!baud)
+                baud = 9600;
+        divisor = ((rp_baud_base[info->board] + (baud >> 1)) / baud) - 1;
+        if ((divisor >= 8192 || divisor < 0) && old_termios) {
+                baud = tty_termios_baud_rate(old_termios);
+                if (!baud)
+                        baud = 9600;
+                divisor = (rp_baud_base[info->board] / baud) - 1;
+        }
+        if (divisor >= 8192 || divisor < 0) {
+                baud = 9600;
+                divisor = (rp_baud_base[info->board] / baud) - 1;
+        }
+        info->cps = baud / bits;
+        sSetBaud(cp, divisor);
+
+        /* FIXME: Should really back compute a baud rate from the divisor */
+        tty_encode_baud_rate(tty, baud, baud);
+
+        if (cflag & CRTSCTS) {
+                info->intmask |= DELTA_CTS;
+                sEnCTSFlowCtl(cp);
+        } else {
+                info->intmask &= ~DELTA_CTS;
+                sDisCTSFlowCtl(cp);
+        }
+        if (cflag & CLOCAL) {
+                info->intmask &= ~DELTA_CD;
+        } else {
+                spin_lock_irqsave(&info->slock, flags);
+                if (sGetChanStatus(cp) & CD_ACT)
+                        info->cd_status = 1;
+                else
+                        info->cd_status = 0;
+                info->intmask |= DELTA_CD;
+                spin_unlock_irqrestore(&info->slock, flags);
+        }
+
+        /*
+         * Handle software flow control in the board
+         */
+#ifdef ROCKET_SOFT_FLOW
+        if (I_IXON(tty)) {
+                sEnTxSoftFlowCtl(cp);
+                if (I_IXANY(tty)) {
+                        sEnIXANY(cp);
+                } else {
+                        sDisIXANY(cp);
+                }
+                sSetTxXONChar(cp, START_CHAR(tty));
+                sSetTxXOFFChar(cp, STOP_CHAR(tty));
+        } else {
+                sDisTxSoftFlowCtl(cp);
+                sDisIXANY(cp);
+                sClrTxXOFF(cp);
+        }
+#endif
+
+        /*
+         * Set up ignore/read mask words
+         */
+        info->read_status_mask = STMRCVROVRH | 0xFF;
+        if (I_INPCK(tty))
+                info->read_status_mask |= STMFRAMEH | STMPARITYH;
+        if (I_BRKINT(tty) || I_PARMRK(tty))
+                info->read_status_mask |= STMBREAKH;
+
+        /*
+         * Characters to ignore
+         */
+        info->ignore_status_mask = 0;
+        if (I_IGNPAR(tty))
+                info->ignore_status_mask |= STMFRAMEH | STMPARITYH;
+        if (I_IGNBRK(tty)) {
+                info->ignore_status_mask |= STMBREAKH;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too.  (For real raw support).
+                 */
+                if (I_IGNPAR(tty))
+                        info->ignore_status_mask |= STMRCVROVRH;
+        }
+
+        rocketMode = info->flags & ROCKET_MODE_MASK;
+
+        if ((info->flags & ROCKET_RTS_TOGGLE)
+            || (rocketMode == ROCKET_MODE_RS485))
+                sEnRTSToggle(cp);
+        else
+                sDisRTSToggle(cp);
+
+        sSetRTS(&info->channel);
+
+        if (cp->CtlP->boardType == ROCKET_TYPE_PC104) {
+                switch (rocketMode) {
+                case ROCKET_MODE_RS485:
+                        sSetInterfaceMode(cp, InterfaceModeRS485);
+                        break;
+                case ROCKET_MODE_RS422:
+                        sSetInterfaceMode(cp, InterfaceModeRS422);
+                        break;
+                case ROCKET_MODE_RS232:
+                default:
+                        if (info->flags & ROCKET_RTS_TOGGLE)
+                                sSetInterfaceMode(cp, InterfaceModeRS232T);
+                        else
+                                sSetInterfaceMode(cp, InterfaceModeRS232);
+                        break;
+                }
+        }
+}
+
+static int carrier_raised(struct tty_port *port)
+{
+        struct r_port *info = container_of(port, struct r_port, port);
+        return (sGetChanStatusLo(&info->channel) & CD_ACT) ? 1 : 0;
+}
+
+static void dtr_rts(struct tty_port *port, int on)
+{
+        struct r_port *info = container_of(port, struct r_port, port);
+        if (on) {
+                sSetDTR(&info->channel);
+                sSetRTS(&info->channel);
+        } else {
+                sClrDTR(&info->channel);
+                sClrRTS(&info->channel);
+        }
+}
+
+/*
+ *  Exception handler that opens a serial port.  Creates xmit_buf storage, fills in 
+ *  port's r_port struct.  Initializes the port hardware.  
+ */
+static int rp_open(struct tty_struct *tty, struct file *filp)
+{
+        struct r_port *info;
+        struct tty_port *port;
+        int line = 0, retval;
+        CHANNEL_t *cp;
+        unsigned long page;
+
+        line = tty->index;
+        if (line < 0 || line >= MAX_RP_PORTS || ((info = rp_table[line]) == NULL))
+                return -ENXIO;
+        port = &info->port;
+        
+        page = __get_free_page(GFP_KERNEL);
+        if (!page)
+                return -ENOMEM;
+
+        if (port->flags & ASYNC_CLOSING) {
+                retval = wait_for_completion_interruptible(&info->close_wait);
+                free_page(page);
+                if (retval)
+                        return retval;
+                return ((port->flags & ASYNC_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
+        }
+
+        /*
+         * We must not sleep from here until the port is marked fully in use.
+         */
+        if (info->xmit_buf)
+                free_page(page);
+        else
+                info->xmit_buf = (unsigned char *) page;
+
+        tty->driver_data = info;
+        tty_port_tty_set(port, tty);
+
+        if (port->count++ == 0) {
+                atomic_inc(&rp_num_ports_open);
+
+#ifdef ROCKET_DEBUG_OPEN
+                printk(KERN_INFO "rocket mod++ = %d...\n",
+                                atomic_read(&rp_num_ports_open));
+#endif
+        }
+#ifdef ROCKET_DEBUG_OPEN
+        printk(KERN_INFO "rp_open ttyR%d, count=%d\n", info->line, info->port.count);
+#endif
+
+        /*
+         * Info->count is now 1; so it's safe to sleep now.
+         */
+        if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+                cp = &info->channel;
+                sSetRxTrigger(cp, TRIG_1);
+                if (sGetChanStatus(cp) & CD_ACT)
+                        info->cd_status = 1;
+                else
+                        info->cd_status = 0;
+                sDisRxStatusMode(cp);
+                sFlushRxFIFO(cp);
+                sFlushTxFIFO(cp);
+
+                sEnInterrupts(cp, (TXINT_EN | MCINT_EN | RXINT_EN | SRCINT_EN | CHANINT_EN));
+                sSetRxTrigger(cp, TRIG_1);
+
+                sGetChanStatus(cp);
+                sDisRxStatusMode(cp);
+                sClrTxXOFF(cp);
+
+                sDisCTSFlowCtl(cp);
+                sDisTxSoftFlowCtl(cp);
+
+                sEnRxFIFO(cp);
+                sEnTransmit(cp);
+
+                set_bit(ASYNCB_INITIALIZED, &info->port.flags);
+
+                /*
+                 * Set up the tty->alt_speed kludge
+                 */
+                if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_HI)
+                        tty->alt_speed = 57600;
+                if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_VHI)
+                        tty->alt_speed = 115200;
+                if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_SHI)
+                        tty->alt_speed = 230400;
+                if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_WARP)
+                        tty->alt_speed = 460800;
+
+                configure_r_port(tty, info, NULL);
+                if (tty->termios->c_cflag & CBAUD) {
+                        sSetDTR(cp);
+                        sSetRTS(cp);
+                }
+        }
+        /*  Starts (or resets) the maint polling loop */
+        mod_timer(&rocket_timer, jiffies + POLL_PERIOD);
+
+        retval = tty_port_block_til_ready(port, tty, filp);
+        if (retval) {
+#ifdef ROCKET_DEBUG_OPEN
+                printk(KERN_INFO "rp_open returning after block_til_ready with %d\n", retval);
+#endif
+                return retval;
+        }
+        return 0;
+}
+
+/*
+ *  Exception handler that closes a serial port. info->port.count is considered critical.
+ */
+static void rp_close(struct tty_struct *tty, struct file *filp)
+{
+        struct r_port *info = tty->driver_data;
+        struct tty_port *port = &info->port;
+        int timeout;
+        CHANNEL_t *cp;
+        
+        if (rocket_paranoia_check(info, "rp_close"))
+                return;
+
+#ifdef ROCKET_DEBUG_OPEN
+        printk(KERN_INFO "rp_close ttyR%d, count = %d\n", info->line, info->port.count);
+#endif
+
+        if (tty_port_close_start(port, tty, filp) == 0)
+                return;
+
+        mutex_lock(&port->mutex);
+        cp = &info->channel;
+        /*
+         * Before we drop DTR, make sure the UART transmitter
+         * has completely drained; this is especially
+         * important if there is a transmit FIFO!
+         */
+        timeout = (sGetTxCnt(cp) + 1) * HZ / info->cps;
+        if (timeout == 0)
+                timeout = 1;
+        rp_wait_until_sent(tty, timeout);
+        clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+
+        sDisTransmit(cp);
+        sDisInterrupts(cp, (TXINT_EN | MCINT_EN | RXINT_EN | SRCINT_EN | CHANINT_EN));
+        sDisCTSFlowCtl(cp);
+        sDisTxSoftFlowCtl(cp);
+        sClrTxXOFF(cp);
+        sFlushRxFIFO(cp);
+        sFlushTxFIFO(cp);
+        sClrRTS(cp);
+        if (C_HUPCL(tty))
+                sClrDTR(cp);
+
+        rp_flush_buffer(tty);
+                
+        tty_ldisc_flush(tty);
+
+        clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+
+        /* We can't yet use tty_port_close_end as the buffer handling in this
+           driver is a bit different to the usual */
+
+        if (port->blocked_open) {
+                if (port->close_delay) {
+                        msleep_interruptible(jiffies_to_msecs(port->close_delay));
+                }
+                wake_up_interruptible(&port->open_wait);
+        } else {
+                if (info->xmit_buf) {
+                        free_page((unsigned long) info->xmit_buf);
+                        info->xmit_buf = NULL;
+                }
+        }
+        spin_lock_irq(&port->lock);
+        info->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_CLOSING | ASYNC_NORMAL_ACTIVE);
+        tty->closing = 0;
+        spin_unlock_irq(&port->lock);
+        mutex_unlock(&port->mutex);
+        tty_port_tty_set(port, NULL);
+
+        wake_up_interruptible(&port->close_wait);
+        complete_all(&info->close_wait);
+        atomic_dec(&rp_num_ports_open);
+
+#ifdef ROCKET_DEBUG_OPEN
+        printk(KERN_INFO "rocket mod-- = %d...\n",
+                        atomic_read(&rp_num_ports_open));
+        printk(KERN_INFO "rp_close ttyR%d complete shutdown\n", info->line);
+#endif
+
+}
+
+static void rp_set_termios(struct tty_struct *tty,
+                           struct ktermios *old_termios)
+{
+        struct r_port *info = tty->driver_data;
+        CHANNEL_t *cp;
+        unsigned cflag;
+
+        if (rocket_paranoia_check(info, "rp_set_termios"))
+                return;
+
+        cflag = tty->termios->c_cflag;
+
+        /*
+         * This driver doesn't support CS5 or CS6
+         */
+        if (((cflag & CSIZE) == CS5) || ((cflag & CSIZE) == CS6))
+                tty->termios->c_cflag =
+                    ((cflag & ~CSIZE) | (old_termios->c_cflag & CSIZE));
+        /* Or CMSPAR */
+        tty->termios->c_cflag &= ~CMSPAR;
+
+        configure_r_port(tty, info, old_termios);
+
+        cp = &info->channel;
+
+        /* Handle transition to B0 status */
+        if ((old_termios->c_cflag & CBAUD) && !(tty->termios->c_cflag & CBAUD)) {
+                sClrDTR(cp);
+                sClrRTS(cp);
+        }
+
+        /* Handle transition away from B0 status */
+        if (!(old_termios->c_cflag & CBAUD) && (tty->termios->c_cflag & CBAUD)) {
+                if (!tty->hw_stopped || !(tty->termios->c_cflag & CRTSCTS))
+                        sSetRTS(cp);
+                sSetDTR(cp);
+        }
+
+        if ((old_termios->c_cflag & CRTSCTS) && !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                rp_start(tty);
+        }
+}
+
+static int rp_break(struct tty_struct *tty, int break_state)
+{
+        struct r_port *info = tty->driver_data;
+        unsigned long flags;
+
+        if (rocket_paranoia_check(info, "rp_break"))
+                return -EINVAL;
+
+        spin_lock_irqsave(&info->slock, flags);
+        if (break_state == -1)
+                sSendBreak(&info->channel);
+        else
+                sClrBreak(&info->channel);
+        spin_unlock_irqrestore(&info->slock, flags);
+        return 0;
+}
+
+/*
+ * sGetChanRI used to be a macro in rocket_int.h. When the functionality for
+ * the UPCI boards was added, it was decided to make this a function because
+ * the macro was getting too complicated. All cases except the first one
+ * (UPCIRingInd) are taken directly from the original macro.
+ */
+static int sGetChanRI(CHANNEL_T * ChP)
+{
+        CONTROLLER_t *CtlP = ChP->CtlP;
+        int ChanNum = ChP->ChanNum;
+        int RingInd = 0;
+
+        if (CtlP->UPCIRingInd)
+                RingInd = !(sInB(CtlP->UPCIRingInd) & sBitMapSetTbl[ChanNum]);
+        else if (CtlP->AltChanRingIndicator)
+                RingInd = sInB((ByteIO_t) (ChP->ChanStat + 8)) & DSR_ACT;
+        else if (CtlP->boardType == ROCKET_TYPE_PC104)
+                RingInd = !(sInB(CtlP->AiopIO[3]) & sBitMapSetTbl[ChanNum]);
+
+        return RingInd;
+}
+
+/********************************************************************************************/
+/*  Here are the routines used by rp_ioctl.  These are all called from exception handlers.  */
+
+/*
+ *  Returns the state of the serial modem control lines.  These next 2 functions 
+ *  are the way kernel versions > 2.5 handle modem control lines rather than IOCTLs.
+ */
+static int rp_tiocmget(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+        unsigned int control, result, ChanStatus;
+
+        ChanStatus = sGetChanStatusLo(&info->channel);
+        control = info->channel.TxControl[3];
+        result = ((control & SET_RTS) ? TIOCM_RTS : 0) | 
+                ((control & SET_DTR) ?  TIOCM_DTR : 0) |
+                ((ChanStatus & CD_ACT) ? TIOCM_CAR : 0) |
+                (sGetChanRI(&info->channel) ? TIOCM_RNG : 0) |
+                ((ChanStatus & DSR_ACT) ? TIOCM_DSR : 0) |
+                ((ChanStatus & CTS_ACT) ? TIOCM_CTS : 0);
+
+        return result;
+}
+
+/* 
+ *  Sets the modem control lines
+ */
+static int rp_tiocmset(struct tty_struct *tty,
+                                unsigned int set, unsigned int clear)
+{
+        struct r_port *info = tty->driver_data;
+
+        if (set & TIOCM_RTS)
+                info->channel.TxControl[3] |= SET_RTS;
+        if (set & TIOCM_DTR)
+                info->channel.TxControl[3] |= SET_DTR;
+        if (clear & TIOCM_RTS)
+                info->channel.TxControl[3] &= ~SET_RTS;
+        if (clear & TIOCM_DTR)
+                info->channel.TxControl[3] &= ~SET_DTR;
+
+        out32(info->channel.IndexAddr, info->channel.TxControl);
+        return 0;
+}
+
+static int get_config(struct r_port *info, struct rocket_config __user *retinfo)
+{
+        struct rocket_config tmp;
+
+        if (!retinfo)
+                return -EFAULT;
+        memset(&tmp, 0, sizeof (tmp));
+        mutex_lock(&info->port.mutex);
+        tmp.line = info->line;
+        tmp.flags = info->flags;
+        tmp.close_delay = info->port.close_delay;
+        tmp.closing_wait = info->port.closing_wait;
+        tmp.port = rcktpt_io_addr[(info->line >> 5) & 3];
+        mutex_unlock(&info->port.mutex);
+
+        if (copy_to_user(retinfo, &tmp, sizeof (*retinfo)))
+                return -EFAULT;
+        return 0;
+}
+
+static int set_config(struct tty_struct *tty, struct r_port *info,
+                                        struct rocket_config __user *new_info)
+{
+        struct rocket_config new_serial;
+
+        if (copy_from_user(&new_serial, new_info, sizeof (new_serial)))
+                return -EFAULT;
+
+        mutex_lock(&info->port.mutex);
+        if (!capable(CAP_SYS_ADMIN))
+        {
+                if ((new_serial.flags & ~ROCKET_USR_MASK) != (info->flags & ~ROCKET_USR_MASK)) {
+                        mutex_unlock(&info->port.mutex);
+                        return -EPERM;
+                }
+                info->flags = ((info->flags & ~ROCKET_USR_MASK) | (new_serial.flags & ROCKET_USR_MASK));
+                configure_r_port(tty, info, NULL);
+                mutex_unlock(&info->port.mutex);
+                return 0;
+        }
+
+        info->flags = ((info->flags & ~ROCKET_FLAGS) | (new_serial.flags & ROCKET_FLAGS));
+        info->port.close_delay = new_serial.close_delay;
+        info->port.closing_wait = new_serial.closing_wait;
+
+        if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_HI)
+                tty->alt_speed = 57600;
+        if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_VHI)
+                tty->alt_speed = 115200;
+        if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_SHI)
+                tty->alt_speed = 230400;
+        if ((info->flags & ROCKET_SPD_MASK) == ROCKET_SPD_WARP)
+                tty->alt_speed = 460800;
+        mutex_unlock(&info->port.mutex);
+
+        configure_r_port(tty, info, NULL);
+        return 0;
+}
+
+/*
+ *  This function fills in a rocket_ports struct with information
+ *  about what boards/ports are in the system.  This info is passed
+ *  to user space.  See setrocket.c where the info is used to create
+ *  the /dev/ttyRx ports.
+ */
+static int get_ports(struct r_port *info, struct rocket_ports __user *retports)
+{
+        struct rocket_ports tmp;
+        int board;
+
+        if (!retports)
+                return -EFAULT;
+        memset(&tmp, 0, sizeof (tmp));
+        tmp.tty_major = rocket_driver->major;
+
+        for (board = 0; board < 4; board++) {
+                tmp.rocketModel[board].model = rocketModel[board].model;
+                strcpy(tmp.rocketModel[board].modelString, rocketModel[board].modelString);
+                tmp.rocketModel[board].numPorts = rocketModel[board].numPorts;
+                tmp.rocketModel[board].loadrm2 = rocketModel[board].loadrm2;
+                tmp.rocketModel[board].startingPortNumber = rocketModel[board].startingPortNumber;
+        }
+        if (copy_to_user(retports, &tmp, sizeof (*retports)))
+                return -EFAULT;
+        return 0;
+}
+
+static int reset_rm2(struct r_port *info, void __user *arg)
+{
+        int reset;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        if (copy_from_user(&reset, arg, sizeof (int)))
+                return -EFAULT;
+        if (reset)
+                reset = 1;
+
+        if (rcktpt_type[info->board] != ROCKET_TYPE_MODEMII &&
+            rcktpt_type[info->board] != ROCKET_TYPE_MODEMIII)
+                return -EINVAL;
+
+        if (info->ctlp->BusType == isISA)
+                sModemReset(info->ctlp, info->chan, reset);
+        else
+                sPCIModemReset(info->ctlp, info->chan, reset);
+
+        return 0;
+}
+
+static int get_version(struct r_port *info, struct rocket_version __user *retvers)
+{
+        if (copy_to_user(retvers, &driver_version, sizeof (*retvers)))
+                return -EFAULT;
+        return 0;
+}
+
+/*  IOCTL call handler into the driver */
+static int rp_ioctl(struct tty_struct *tty,
+                    unsigned int cmd, unsigned long arg)
+{
+        struct r_port *info = tty->driver_data;
+        void __user *argp = (void __user *)arg;
+        int ret = 0;
+
+        if (cmd != RCKP_GET_PORTS && rocket_paranoia_check(info, "rp_ioctl"))
+                return -ENXIO;
+
+        switch (cmd) {
+        case RCKP_GET_STRUCT:
+                if (copy_to_user(argp, info, sizeof (struct r_port)))
+                        ret = -EFAULT;
+                break;
+        case RCKP_GET_CONFIG:
+                ret = get_config(info, argp);
+                break;
+        case RCKP_SET_CONFIG:
+                ret = set_config(tty, info, argp);
+                break;
+        case RCKP_GET_PORTS:
+                ret = get_ports(info, argp);
+                break;
+        case RCKP_RESET_RM2:
+                ret = reset_rm2(info, argp);
+                break;
+        case RCKP_GET_VERSION:
+                ret = get_version(info, argp);
+                break;
+        default:
+                ret = -ENOIOCTLCMD;
+        }
+        return ret;
+}
+
+static void rp_send_xchar(struct tty_struct *tty, char ch)
+{
+        struct r_port *info = tty->driver_data;
+        CHANNEL_t *cp;
+
+        if (rocket_paranoia_check(info, "rp_send_xchar"))
+                return;
+
+        cp = &info->channel;
+        if (sGetTxCnt(cp))
+                sWriteTxPrioByte(cp, ch);
+        else
+                sWriteTxByte(sGetTxRxDataIO(cp), ch);
+}
+
+static void rp_throttle(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+
+#ifdef ROCKET_DEBUG_THROTTLE
+        printk(KERN_INFO "throttle %s: %d....\n", tty->name,
+               tty->ldisc.chars_in_buffer(tty));
+#endif
+
+        if (rocket_paranoia_check(info, "rp_throttle"))
+                return;
+
+        if (I_IXOFF(tty))
+                rp_send_xchar(tty, STOP_CHAR(tty));
+
+        sClrRTS(&info->channel);
+}
+
+static void rp_unthrottle(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+#ifdef ROCKET_DEBUG_THROTTLE
+        printk(KERN_INFO "unthrottle %s: %d....\n", tty->name,
+               tty->ldisc.chars_in_buffer(tty));
+#endif
+
+        if (rocket_paranoia_check(info, "rp_throttle"))
+                return;
+
+        if (I_IXOFF(tty))
+                rp_send_xchar(tty, START_CHAR(tty));
+
+        sSetRTS(&info->channel);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rp_stop() and rp_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void rp_stop(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+
+#ifdef ROCKET_DEBUG_FLOW
+        printk(KERN_INFO "stop %s: %d %d....\n", tty->name,
+               info->xmit_cnt, info->xmit_fifo_room);
+#endif
+
+        if (rocket_paranoia_check(info, "rp_stop"))
+                return;
+
+        if (sGetTxCnt(&info->channel))
+                sDisTransmit(&info->channel);
+}
+
+static void rp_start(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+
+#ifdef ROCKET_DEBUG_FLOW
+        printk(KERN_INFO "start %s: %d %d....\n", tty->name,
+               info->xmit_cnt, info->xmit_fifo_room);
+#endif
+
+        if (rocket_paranoia_check(info, "rp_stop"))
+                return;
+
+        sEnTransmit(&info->channel);
+        set_bit((info->aiop * 8) + info->chan,
+                (void *) &xmit_flags[info->board]);
+}
+
+/*
+ * rp_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rp_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        struct r_port *info = tty->driver_data;
+        CHANNEL_t *cp;
+        unsigned long orig_jiffies;
+        int check_time, exit_time;
+        int txcnt;
+
+        if (rocket_paranoia_check(info, "rp_wait_until_sent"))
+                return;
+
+        cp = &info->channel;
+
+        orig_jiffies = jiffies;
+#ifdef ROCKET_DEBUG_WAIT_UNTIL_SENT
+        printk(KERN_INFO "In RP_wait_until_sent(%d) (jiff=%lu)...\n", timeout,
+               jiffies);
+        printk(KERN_INFO "cps=%d...\n", info->cps);
+#endif
+        while (1) {
+                txcnt = sGetTxCnt(cp);
+                if (!txcnt) {
+                        if (sGetChanStatusLo(cp) & TXSHRMT)
+                                break;
+                        check_time = (HZ / info->cps) / 5;
+                } else {
+                        check_time = HZ * txcnt / info->cps;
+                }
+                if (timeout) {
+                        exit_time = orig_jiffies + timeout - jiffies;
+                        if (exit_time <= 0)
+                                break;
+                        if (exit_time < check_time)
+                                check_time = exit_time;
+                }
+                if (check_time == 0)
+                        check_time = 1;
+#ifdef ROCKET_DEBUG_WAIT_UNTIL_SENT
+                printk(KERN_INFO "txcnt = %d (jiff=%lu,check=%d)...\n", txcnt,
+                                jiffies, check_time);
+#endif
+                msleep_interruptible(jiffies_to_msecs(check_time));
+                if (signal_pending(current))
+                        break;
+        }
+        __set_current_state(TASK_RUNNING);
+#ifdef ROCKET_DEBUG_WAIT_UNTIL_SENT
+        printk(KERN_INFO "txcnt = %d (jiff=%lu)...done\n", txcnt, jiffies);
+#endif
+}
+
+/*
+ * rp_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void rp_hangup(struct tty_struct *tty)
+{
+        CHANNEL_t *cp;
+        struct r_port *info = tty->driver_data;
+        unsigned long flags;
+
+        if (rocket_paranoia_check(info, "rp_hangup"))
+                return;
+
+#if (defined(ROCKET_DEBUG_OPEN) || defined(ROCKET_DEBUG_HANGUP))
+        printk(KERN_INFO "rp_hangup of ttyR%d...\n", info->line);
+#endif
+        rp_flush_buffer(tty);
+        spin_lock_irqsave(&info->port.lock, flags);
+        if (info->port.flags & ASYNC_CLOSING) {
+                spin_unlock_irqrestore(&info->port.lock, flags);
+                return;
+        }
+        if (info->port.count)
+                atomic_dec(&rp_num_ports_open);
+        clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+        spin_unlock_irqrestore(&info->port.lock, flags);
+
+        tty_port_hangup(&info->port);
+
+        cp = &info->channel;
+        sDisRxFIFO(cp);
+        sDisTransmit(cp);
+        sDisInterrupts(cp, (TXINT_EN | MCINT_EN | RXINT_EN | SRCINT_EN | CHANINT_EN));
+        sDisCTSFlowCtl(cp);
+        sDisTxSoftFlowCtl(cp);
+        sClrTxXOFF(cp);
+        clear_bit(ASYNCB_INITIALIZED, &info->port.flags);
+
+        wake_up_interruptible(&info->port.open_wait);
+}
+
+/*
+ *  Exception handler - write char routine.  The RocketPort driver uses a
+ *  double-buffering strategy, with the twist that if the in-memory CPU
+ *  buffer is empty, and there's space in the transmit FIFO, the
+ *  writing routines will write directly to transmit FIFO.
+ *  Write buffer and counters protected by spinlocks
+ */
+static int rp_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct r_port *info = tty->driver_data;
+        CHANNEL_t *cp;
+        unsigned long flags;
+
+        if (rocket_paranoia_check(info, "rp_put_char"))
+                return 0;
+
+        /*
+         * Grab the port write mutex, locking out other processes that try to
+         * write to this port
+         */
+        mutex_lock(&info->write_mtx);
+
+#ifdef ROCKET_DEBUG_WRITE
+        printk(KERN_INFO "rp_put_char %c...\n", ch);
+#endif
+
+        spin_lock_irqsave(&info->slock, flags);
+        cp = &info->channel;
+
+        if (!tty->stopped && !tty->hw_stopped && info->xmit_fifo_room == 0)
+                info->xmit_fifo_room = TXFIFO_SIZE - sGetTxCnt(cp);
+
+        if (tty->stopped || tty->hw_stopped || info->xmit_fifo_room == 0 || info->xmit_cnt != 0) {
+                info->xmit_buf[info->xmit_head++] = ch;
+                info->xmit_head &= XMIT_BUF_SIZE - 1;
+                info->xmit_cnt++;
+                set_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+        } else {
+                sOutB(sGetTxRxDataIO(cp), ch);
+                info->xmit_fifo_room--;
+        }
+        spin_unlock_irqrestore(&info->slock, flags);
+        mutex_unlock(&info->write_mtx);
+        return 1;
+}
+
+/*
+ *  Exception handler - write routine, called when user app writes to the device.
+ *  A per port write mutex is used to protect from another process writing to
+ *  this port at the same time.  This other process could be running on the other CPU
+ *  or get control of the CPU if the copy_from_user() blocks due to a page fault (swapped out). 
+ *  Spinlocks protect the info xmit members.
+ */
+static int rp_write(struct tty_struct *tty,
+                    const unsigned char *buf, int count)
+{
+        struct r_port *info = tty->driver_data;
+        CHANNEL_t *cp;
+        const unsigned char *b;
+        int c, retval = 0;
+        unsigned long flags;
+
+        if (count <= 0 || rocket_paranoia_check(info, "rp_write"))
+                return 0;
+
+        if (mutex_lock_interruptible(&info->write_mtx))
+                return -ERESTARTSYS;
+
+#ifdef ROCKET_DEBUG_WRITE
+        printk(KERN_INFO "rp_write %d chars...\n", count);
+#endif
+        cp = &info->channel;
+
+        if (!tty->stopped && !tty->hw_stopped && info->xmit_fifo_room < count)
+                info->xmit_fifo_room = TXFIFO_SIZE - sGetTxCnt(cp);
+
+        /*
+         *  If the write queue for the port is empty, and there is FIFO space, stuff bytes 
+         *  into FIFO.  Use the write queue for temp storage.
+         */
+        if (!tty->stopped && !tty->hw_stopped && info->xmit_cnt == 0 && info->xmit_fifo_room > 0) {
+                c = min(count, info->xmit_fifo_room);
+                b = buf;
+
+                /*  Push data into FIFO, 2 bytes at a time */
+                sOutStrW(sGetTxRxDataIO(cp), (unsigned short *) b, c / 2);
+
+                /*  If there is a byte remaining, write it */
+                if (c & 1)
+                        sOutB(sGetTxRxDataIO(cp), b[c - 1]);
+
+                retval += c;
+                buf += c;
+                count -= c;
+
+                spin_lock_irqsave(&info->slock, flags);
+                info->xmit_fifo_room -= c;
+                spin_unlock_irqrestore(&info->slock, flags);
+        }
+
+        /* If count is zero, we wrote it all and are done */
+        if (!count)
+                goto end;
+
+        /*  Write remaining data into the port's xmit_buf */
+        while (1) {
+                /* Hung up ? */
+                if (!test_bit(ASYNCB_NORMAL_ACTIVE, &info->port.flags))
+                        goto end;
+                c = min(count, XMIT_BUF_SIZE - info->xmit_cnt - 1);
+                c = min(c, XMIT_BUF_SIZE - info->xmit_head);
+                if (c <= 0)
+                        break;
+
+                b = buf;
+                memcpy(info->xmit_buf + info->xmit_head, b, c);
+
+                spin_lock_irqsave(&info->slock, flags);
+                info->xmit_head =
+                    (info->xmit_head + c) & (XMIT_BUF_SIZE - 1);
+                info->xmit_cnt += c;
+                spin_unlock_irqrestore(&info->slock, flags);
+
+                buf += c;
+                count -= c;
+                retval += c;
+        }
+
+        if ((retval > 0) && !tty->stopped && !tty->hw_stopped)
+                set_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
+        
+end:
+        if (info->xmit_cnt < WAKEUP_CHARS) {
+                tty_wakeup(tty);
+#ifdef ROCKETPORT_HAVE_POLL_WAIT
+                wake_up_interruptible(&tty->poll_wait);
+#endif
+        }
+        mutex_unlock(&info->write_mtx);
+        return retval;
+}
+
+/*
+ * Return the number of characters that can be sent.  We estimate
+ * only using the in-memory transmit buffer only, and ignore the
+ * potential space in the transmit FIFO.
+ */
+static int rp_write_room(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+        int ret;
+
+        if (rocket_paranoia_check(info, "rp_write_room"))
+                return 0;
+
+        ret = XMIT_BUF_SIZE - info->xmit_cnt - 1;
+        if (ret < 0)
+                ret = 0;
+#ifdef ROCKET_DEBUG_WRITE
+        printk(KERN_INFO "rp_write_room returns %d...\n", ret);
+#endif
+        return ret;
+}
+
+/*
+ * Return the number of characters in the buffer.  Again, this only
+ * counts those characters in the in-memory transmit buffer.
+ */
+static int rp_chars_in_buffer(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+
+        if (rocket_paranoia_check(info, "rp_chars_in_buffer"))
+                return 0;
+
+#ifdef ROCKET_DEBUG_WRITE
+        printk(KERN_INFO "rp_chars_in_buffer returns %d...\n", info->xmit_cnt);
+#endif
+        return info->xmit_cnt;
+}
+
+/*
+ *  Flushes the TX fifo for a port, deletes data in the xmit_buf stored in the
+ *  r_port struct for the port.  Note that spinlock are used to protect info members,
+ *  do not call this function if the spinlock is already held.
+ */
+static void rp_flush_buffer(struct tty_struct *tty)
+{
+        struct r_port *info = tty->driver_data;
+        CHANNEL_t *cp;
+        unsigned long flags;
+
+        if (rocket_paranoia_check(info, "rp_flush_buffer"))
+                return;
+
+        spin_lock_irqsave(&info->slock, flags);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+        spin_unlock_irqrestore(&info->slock, flags);
+
+#ifdef ROCKETPORT_HAVE_POLL_WAIT
+        wake_up_interruptible(&tty->poll_wait);
+#endif
+        tty_wakeup(tty);
+
+        cp = &info->channel;
+        sFlushTxFIFO(cp);
+}
+
+#ifdef CONFIG_PCI
+
+static struct pci_device_id __devinitdata __used rocket_pci_ids[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_RP, PCI_ANY_ID) },
+        { }
+};
+MODULE_DEVICE_TABLE(pci, rocket_pci_ids);
+
+/*
+ *  Called when a PCI card is found.  Retrieves and stores model information,
+ *  init's aiopic and serial port hardware.
+ *  Inputs:  i is the board number (0-n)
+ */
+static __init int register_PCI(int i, struct pci_dev *dev)
+{
+        int num_aiops, aiop, max_num_aiops, num_chan, chan;
+        unsigned int aiopio[MAX_AIOPS_PER_BOARD];
+        CONTROLLER_t *ctlp;
+
+        int fast_clock = 0;
+        int altChanRingIndicator = 0;
+        int ports_per_aiop = 8;
+        WordIO_t ConfigIO = 0;
+        ByteIO_t UPCIRingInd = 0;
+
+        if (!dev || pci_enable_device(dev))
+                return 0;
+
+        rcktpt_io_addr[i] = pci_resource_start(dev, 0);
+
+        rcktpt_type[i] = ROCKET_TYPE_NORMAL;
+        rocketModel[i].loadrm2 = 0;
+        rocketModel[i].startingPortNumber = nextLineNumber;
+
+        /*  Depending on the model, set up some config variables */
+        switch (dev->device) {
+        case PCI_DEVICE_ID_RP4QUAD:
+                max_num_aiops = 1;
+                ports_per_aiop = 4;
+                rocketModel[i].model = MODEL_RP4QUAD;
+                strcpy(rocketModel[i].modelString, "RocketPort 4 port w/quad cable");
+                rocketModel[i].numPorts = 4;
+                break;
+        case PCI_DEVICE_ID_RP8OCTA:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_RP8OCTA;
+                strcpy(rocketModel[i].modelString, "RocketPort 8 port w/octa cable");
+                rocketModel[i].numPorts = 8;
+                break;
+        case PCI_DEVICE_ID_URP8OCTA:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_UPCI_RP8OCTA;
+                strcpy(rocketModel[i].modelString, "RocketPort UPCI 8 port w/octa cable");
+                rocketModel[i].numPorts = 8;
+                break;
+        case PCI_DEVICE_ID_RP8INTF:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_RP8INTF;
+                strcpy(rocketModel[i].modelString, "RocketPort 8 port w/external I/F");
+                rocketModel[i].numPorts = 8;
+                break;
+        case PCI_DEVICE_ID_URP8INTF:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_UPCI_RP8INTF;
+                strcpy(rocketModel[i].modelString, "RocketPort UPCI 8 port w/external I/F");
+                rocketModel[i].numPorts = 8;
+                break;
+        case PCI_DEVICE_ID_RP8J:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_RP8J;
+                strcpy(rocketModel[i].modelString, "RocketPort 8 port w/RJ11 connectors");
+                rocketModel[i].numPorts = 8;
+                break;
+        case PCI_DEVICE_ID_RP4J:
+                max_num_aiops = 1;
+                ports_per_aiop = 4;
+                rocketModel[i].model = MODEL_RP4J;
+                strcpy(rocketModel[i].modelString, "RocketPort 4 port w/RJ45 connectors");
+                rocketModel[i].numPorts = 4;
+                break;
+        case PCI_DEVICE_ID_RP8SNI:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_RP8SNI;
+                strcpy(rocketModel[i].modelString, "RocketPort 8 port w/ custom DB78");
+                rocketModel[i].numPorts = 8;
+                break;
+        case PCI_DEVICE_ID_RP16SNI:
+                max_num_aiops = 2;
+                rocketModel[i].model = MODEL_RP16SNI;
+                strcpy(rocketModel[i].modelString, "RocketPort 16 port w/ custom DB78");
+                rocketModel[i].numPorts = 16;
+                break;
+        case PCI_DEVICE_ID_RP16INTF:
+                max_num_aiops = 2;
+                rocketModel[i].model = MODEL_RP16INTF;
+                strcpy(rocketModel[i].modelString, "RocketPort 16 port w/external I/F");
+                rocketModel[i].numPorts = 16;
+                break;
+        case PCI_DEVICE_ID_URP16INTF:
+                max_num_aiops = 2;
+                rocketModel[i].model = MODEL_UPCI_RP16INTF;
+                strcpy(rocketModel[i].modelString, "RocketPort UPCI 16 port w/external I/F");
+                rocketModel[i].numPorts = 16;
+                break;
+        case PCI_DEVICE_ID_CRP16INTF:
+                max_num_aiops = 2;
+                rocketModel[i].model = MODEL_CPCI_RP16INTF;
+                strcpy(rocketModel[i].modelString, "RocketPort Compact PCI 16 port w/external I/F");
+                rocketModel[i].numPorts = 16;
+                break;
+        case PCI_DEVICE_ID_RP32INTF:
+                max_num_aiops = 4;
+                rocketModel[i].model = MODEL_RP32INTF;
+                strcpy(rocketModel[i].modelString, "RocketPort 32 port w/external I/F");
+                rocketModel[i].numPorts = 32;
+                break;
+        case PCI_DEVICE_ID_URP32INTF:
+                max_num_aiops = 4;
+                rocketModel[i].model = MODEL_UPCI_RP32INTF;
+                strcpy(rocketModel[i].modelString, "RocketPort UPCI 32 port w/external I/F");
+                rocketModel[i].numPorts = 32;
+                break;
+        case PCI_DEVICE_ID_RPP4:
+                max_num_aiops = 1;
+                ports_per_aiop = 4;
+                altChanRingIndicator++;
+                fast_clock++;
+                rocketModel[i].model = MODEL_RPP4;
+                strcpy(rocketModel[i].modelString, "RocketPort Plus 4 port");
+                rocketModel[i].numPorts = 4;
+                break;
+        case PCI_DEVICE_ID_RPP8:
+                max_num_aiops = 2;
+                ports_per_aiop = 4;
+                altChanRingIndicator++;
+                fast_clock++;
+                rocketModel[i].model = MODEL_RPP8;
+                strcpy(rocketModel[i].modelString, "RocketPort Plus 8 port");
+                rocketModel[i].numPorts = 8;
+                break;
+        case PCI_DEVICE_ID_RP2_232:
+                max_num_aiops = 1;
+                ports_per_aiop = 2;
+                altChanRingIndicator++;
+                fast_clock++;
+                rocketModel[i].model = MODEL_RP2_232;
+                strcpy(rocketModel[i].modelString, "RocketPort Plus 2 port RS232");
+                rocketModel[i].numPorts = 2;
+                break;
+        case PCI_DEVICE_ID_RP2_422:
+                max_num_aiops = 1;
+                ports_per_aiop = 2;
+                altChanRingIndicator++;
+                fast_clock++;
+                rocketModel[i].model = MODEL_RP2_422;
+                strcpy(rocketModel[i].modelString, "RocketPort Plus 2 port RS422");
+                rocketModel[i].numPorts = 2;
+                break;
+        case PCI_DEVICE_ID_RP6M:
+
+                max_num_aiops = 1;
+                ports_per_aiop = 6;
+
+                /*  If revision is 1, the rocketmodem flash must be loaded.
+                 *  If it is 2 it is a "socketed" version. */
+                if (dev->revision == 1) {
+                        rcktpt_type[i] = ROCKET_TYPE_MODEMII;
+                        rocketModel[i].loadrm2 = 1;
+                } else {
+                        rcktpt_type[i] = ROCKET_TYPE_MODEM;
+                }
+
+                rocketModel[i].model = MODEL_RP6M;
+                strcpy(rocketModel[i].modelString, "RocketModem 6 port");
+                rocketModel[i].numPorts = 6;
+                break;
+        case PCI_DEVICE_ID_RP4M:
+                max_num_aiops = 1;
+                ports_per_aiop = 4;
+                if (dev->revision == 1) {
+                        rcktpt_type[i] = ROCKET_TYPE_MODEMII;
+                        rocketModel[i].loadrm2 = 1;
+                } else {
+                        rcktpt_type[i] = ROCKET_TYPE_MODEM;
+                }
+
+                rocketModel[i].model = MODEL_RP4M;
+                strcpy(rocketModel[i].modelString, "RocketModem 4 port");
+                rocketModel[i].numPorts = 4;
+                break;
+        default:
+                max_num_aiops = 0;
+                break;
+        }
+
+        /*
+         * Check for UPCI boards.
+         */
+
+        switch (dev->device) {
+        case PCI_DEVICE_ID_URP32INTF:
+        case PCI_DEVICE_ID_URP8INTF:
+        case PCI_DEVICE_ID_URP16INTF:
+        case PCI_DEVICE_ID_CRP16INTF:
+        case PCI_DEVICE_ID_URP8OCTA:
+                rcktpt_io_addr[i] = pci_resource_start(dev, 2);
+                ConfigIO = pci_resource_start(dev, 1);
+                if (dev->device == PCI_DEVICE_ID_URP8OCTA) {
+                        UPCIRingInd = rcktpt_io_addr[i] + _PCI_9030_RING_IND;
+
+                        /*
+                         * Check for octa or quad cable.
+                         */
+                        if (!
+                            (sInW(ConfigIO + _PCI_9030_GPIO_CTRL) &
+                             PCI_GPIO_CTRL_8PORT)) {
+                                ports_per_aiop = 4;
+                                rocketModel[i].numPorts = 4;
+                        }
+                }
+                break;
+        case PCI_DEVICE_ID_UPCI_RM3_8PORT:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_UPCI_RM3_8PORT;
+                strcpy(rocketModel[i].modelString, "RocketModem III 8 port");
+                rocketModel[i].numPorts = 8;
+                rcktpt_io_addr[i] = pci_resource_start(dev, 2);
+                UPCIRingInd = rcktpt_io_addr[i] + _PCI_9030_RING_IND;
+                ConfigIO = pci_resource_start(dev, 1);
+                rcktpt_type[i] = ROCKET_TYPE_MODEMIII;
+                break;
+        case PCI_DEVICE_ID_UPCI_RM3_4PORT:
+                max_num_aiops = 1;
+                rocketModel[i].model = MODEL_UPCI_RM3_4PORT;
+                strcpy(rocketModel[i].modelString, "RocketModem III 4 port");
+                rocketModel[i].numPorts = 4;
+                rcktpt_io_addr[i] = pci_resource_start(dev, 2);
+                UPCIRingInd = rcktpt_io_addr[i] + _PCI_9030_RING_IND;
+                ConfigIO = pci_resource_start(dev, 1);
+                rcktpt_type[i] = ROCKET_TYPE_MODEMIII;
+                break;
+        default:
+                break;
+        }
+
+        if (fast_clock) {
+                sClockPrescale = 0x12;  /* mod 2 (divide by 3) */
+                rp_baud_base[i] = 921600;
+        } else {
+                /*
+                 * If support_low_speed is set, use the slow clock
+                 * prescale, which supports 50 bps
+                 */
+                if (support_low_speed) {
+                        /* mod 9 (divide by 10) prescale */
+                        sClockPrescale = 0x19;
+                        rp_baud_base[i] = 230400;
+                } else {
+                        /* mod 4 (divide by 5) prescale */
+                        sClockPrescale = 0x14;
+                        rp_baud_base[i] = 460800;
+                }
+        }
+
+        for (aiop = 0; aiop < max_num_aiops; aiop++)
+                aiopio[aiop] = rcktpt_io_addr[i] + (aiop * 0x40);
+        ctlp = sCtlNumToCtlPtr(i);
+        num_aiops = sPCIInitController(ctlp, i, aiopio, max_num_aiops, ConfigIO, 0, FREQ_DIS, 0, altChanRingIndicator, UPCIRingInd);
+        for (aiop = 0; aiop < max_num_aiops; aiop++)
+                ctlp->AiopNumChan[aiop] = ports_per_aiop;
+
+        dev_info(&dev->dev, "comtrol PCI controller #%d found at "
+                "address %04lx, %d AIOP(s) (%s), creating ttyR%d - %ld\n",
+                i, rcktpt_io_addr[i], num_aiops, rocketModel[i].modelString,
+                rocketModel[i].startingPortNumber,
+                rocketModel[i].startingPortNumber + rocketModel[i].numPorts-1);
+
+        if (num_aiops <= 0) {
+                rcktpt_io_addr[i] = 0;
+                return (0);
+        }
+        is_PCI[i] = 1;
+
+        /*  Reset the AIOPIC, init the serial ports */
+        for (aiop = 0; aiop < num_aiops; aiop++) {
+                sResetAiopByNum(ctlp, aiop);
+                num_chan = ports_per_aiop;
+                for (chan = 0; chan < num_chan; chan++)
+                        init_r_port(i, aiop, chan, dev);
+        }
+
+        /*  Rocket modems must be reset */
+        if ((rcktpt_type[i] == ROCKET_TYPE_MODEM) ||
+            (rcktpt_type[i] == ROCKET_TYPE_MODEMII) ||
+            (rcktpt_type[i] == ROCKET_TYPE_MODEMIII)) {
+                num_chan = ports_per_aiop;
+                for (chan = 0; chan < num_chan; chan++)
+                        sPCIModemReset(ctlp, chan, 1);
+                msleep(500);
+                for (chan = 0; chan < num_chan; chan++)
+                        sPCIModemReset(ctlp, chan, 0);
+                msleep(500);
+                rmSpeakerReset(ctlp, rocketModel[i].model);
+        }
+        return (1);
+}
+
+/*
+ *  Probes for PCI cards, inits them if found
+ *  Input:   board_found = number of ISA boards already found, or the
+ *           starting board number
+ *  Returns: Number of PCI boards found
+ */
+static int __init init_PCI(int boards_found)
+{
+        struct pci_dev *dev = NULL;
+        int count = 0;
+
+        /*  Work through the PCI device list, pulling out ours */
+        while ((dev = pci_get_device(PCI_VENDOR_ID_RP, PCI_ANY_ID, dev))) {
+                if (register_PCI(count + boards_found, dev))
+                        count++;
+        }
+        return (count);
+}
+
+#endif                          /* CONFIG_PCI */
+
+/*
+ *  Probes for ISA cards
+ *  Input:   i = the board number to look for
+ *  Returns: 1 if board found, 0 else
+ */
+static int __init init_ISA(int i)
+{
+        int num_aiops, num_chan = 0, total_num_chan = 0;
+        int aiop, chan;
+        unsigned int aiopio[MAX_AIOPS_PER_BOARD];
+        CONTROLLER_t *ctlp;
+        char *type_string;
+
+        /*  If io_addr is zero, no board configured */
+        if (rcktpt_io_addr[i] == 0)
+                return (0);
+
+        /*  Reserve the IO region */
+        if (!request_region(rcktpt_io_addr[i], 64, "Comtrol RocketPort")) {
+                printk(KERN_ERR "Unable to reserve IO region for configured "
+                                "ISA RocketPort at address 0x%lx, board not "
+                                "installed...\n", rcktpt_io_addr[i]);
+                rcktpt_io_addr[i] = 0;
+                return (0);
+        }
+
+        ctlp = sCtlNumToCtlPtr(i);
+
+        ctlp->boardType = rcktpt_type[i];
+
+        switch (rcktpt_type[i]) {
+        case ROCKET_TYPE_PC104:
+                type_string = "(PC104)";
+                break;
+        case ROCKET_TYPE_MODEM:
+                type_string = "(RocketModem)";
+                break;
+        case ROCKET_TYPE_MODEMII:
+                type_string = "(RocketModem II)";
+                break;
+        default:
+                type_string = "";
+                break;
+        }
+
+        /*
+         * If support_low_speed is set, use the slow clock prescale,
+         * which supports 50 bps
+         */
+        if (support_low_speed) {
+                sClockPrescale = 0x19;  /* mod 9 (divide by 10) prescale */
+                rp_baud_base[i] = 230400;
+        } else {
+                sClockPrescale = 0x14;  /* mod 4 (divide by 5) prescale */
+                rp_baud_base[i] = 460800;
+        }
+
+        for (aiop = 0; aiop < MAX_AIOPS_PER_BOARD; aiop++)
+                aiopio[aiop] = rcktpt_io_addr[i] + (aiop * 0x400);
+
+        num_aiops = sInitController(ctlp, i, controller + (i * 0x400), aiopio,  MAX_AIOPS_PER_BOARD, 0, FREQ_DIS, 0);
+
+        if (ctlp->boardType == ROCKET_TYPE_PC104) {
+                sEnAiop(ctlp, 2);       /* only one AIOPIC, but these */
+                sEnAiop(ctlp, 3);       /* CSels used for other stuff */
+        }
+
+        /*  If something went wrong initing the AIOP's release the ISA IO memory */
+        if (num_aiops <= 0) {
+                release_region(rcktpt_io_addr[i], 64);
+                rcktpt_io_addr[i] = 0;
+                return (0);
+        }
+  
+        rocketModel[i].startingPortNumber = nextLineNumber;
+
+        for (aiop = 0; aiop < num_aiops; aiop++) {
+                sResetAiopByNum(ctlp, aiop);
+                sEnAiop(ctlp, aiop);
+                num_chan = sGetAiopNumChan(ctlp, aiop);
+                total_num_chan += num_chan;
+                for (chan = 0; chan < num_chan; chan++)
+                        init_r_port(i, aiop, chan, NULL);
+        }
+        is_PCI[i] = 0;
+        if ((rcktpt_type[i] == ROCKET_TYPE_MODEM) || (rcktpt_type[i] == ROCKET_TYPE_MODEMII)) {
+                num_chan = sGetAiopNumChan(ctlp, 0);
+                total_num_chan = num_chan;
+                for (chan = 0; chan < num_chan; chan++)
+                        sModemReset(ctlp, chan, 1);
+                msleep(500);
+                for (chan = 0; chan < num_chan; chan++)
+                        sModemReset(ctlp, chan, 0);
+                msleep(500);
+                strcpy(rocketModel[i].modelString, "RocketModem ISA");
+        } else {
+                strcpy(rocketModel[i].modelString, "RocketPort ISA");
+        }
+        rocketModel[i].numPorts = total_num_chan;
+        rocketModel[i].model = MODEL_ISA;
+
+        printk(KERN_INFO "RocketPort ISA card #%d found at 0x%lx - %d AIOPs %s\n", 
+               i, rcktpt_io_addr[i], num_aiops, type_string);
+
+        printk(KERN_INFO "Installing %s, creating /dev/ttyR%d - %ld\n",
+               rocketModel[i].modelString,
+               rocketModel[i].startingPortNumber,
+               rocketModel[i].startingPortNumber +
+               rocketModel[i].numPorts - 1);
+
+        return (1);
+}
+
+static const struct tty_operations rocket_ops = {
+        .open = rp_open,
+        .close = rp_close,
+        .write = rp_write,
+        .put_char = rp_put_char,
+        .write_room = rp_write_room,
+        .chars_in_buffer = rp_chars_in_buffer,
+        .flush_buffer = rp_flush_buffer,
+        .ioctl = rp_ioctl,
+        .throttle = rp_throttle,
+        .unthrottle = rp_unthrottle,
+        .set_termios = rp_set_termios,
+        .stop = rp_stop,
+        .start = rp_start,
+        .hangup = rp_hangup,
+        .break_ctl = rp_break,
+        .send_xchar = rp_send_xchar,
+        .wait_until_sent = rp_wait_until_sent,
+        .tiocmget = rp_tiocmget,
+        .tiocmset = rp_tiocmset,
+};
+
+static const struct tty_port_operations rocket_port_ops = {
+        .carrier_raised = carrier_raised,
+        .dtr_rts = dtr_rts,
+};
+
+/*
+ * The module "startup" routine; it's run when the module is loaded.
+ */
+static int __init rp_init(void)
+{
+        int ret = -ENOMEM, pci_boards_found, isa_boards_found, i;
+
+        printk(KERN_INFO "RocketPort device driver module, version %s, %s\n",
+               ROCKET_VERSION, ROCKET_DATE);
+
+        rocket_driver = alloc_tty_driver(MAX_RP_PORTS);
+        if (!rocket_driver)
+                goto err;
+
+        /*
+         *  If board 1 is non-zero, there is at least one ISA configured.  If controller is 
+         *  zero, use the default controller IO address of board1 + 0x40.
+         */
+        if (board1) {
+                if (controller == 0)
+                        controller = board1 + 0x40;
+        } else {
+                controller = 0;  /*  Used as a flag, meaning no ISA boards */
+        }
+
+        /*  If an ISA card is configured, reserve the 4 byte IO space for the Mudbac controller */
+        if (controller && (!request_region(controller, 4, "Comtrol RocketPort"))) {
+                printk(KERN_ERR "Unable to reserve IO region for first "
+                        "configured ISA RocketPort controller 0x%lx.  "
+                        "Driver exiting\n", controller);
+                ret = -EBUSY;
+                goto err_tty;
+        }
+
+        /*  Store ISA variable retrieved from command line or .conf file. */
+        rcktpt_io_addr[0] = board1;
+        rcktpt_io_addr[1] = board2;
+        rcktpt_io_addr[2] = board3;
+        rcktpt_io_addr[3] = board4;
+
+        rcktpt_type[0] = modem1 ? ROCKET_TYPE_MODEM : ROCKET_TYPE_NORMAL;
+        rcktpt_type[0] = pc104_1[0] ? ROCKET_TYPE_PC104 : rcktpt_type[0];
+        rcktpt_type[1] = modem2 ? ROCKET_TYPE_MODEM : ROCKET_TYPE_NORMAL;
+        rcktpt_type[1] = pc104_2[0] ? ROCKET_TYPE_PC104 : rcktpt_type[1];
+        rcktpt_type[2] = modem3 ? ROCKET_TYPE_MODEM : ROCKET_TYPE_NORMAL;
+        rcktpt_type[2] = pc104_3[0] ? ROCKET_TYPE_PC104 : rcktpt_type[2];
+        rcktpt_type[3] = modem4 ? ROCKET_TYPE_MODEM : ROCKET_TYPE_NORMAL;
+        rcktpt_type[3] = pc104_4[0] ? ROCKET_TYPE_PC104 : rcktpt_type[3];
+
+        /*
+         * Set up the tty driver structure and then register this
+         * driver with the tty layer.
+         */
+
+        rocket_driver->owner = THIS_MODULE;
+        rocket_driver->flags = TTY_DRIVER_DYNAMIC_DEV;
+        rocket_driver->name = "ttyR";
+        rocket_driver->driver_name = "Comtrol RocketPort";
+        rocket_driver->major = TTY_ROCKET_MAJOR;
+        rocket_driver->minor_start = 0;
+        rocket_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        rocket_driver->subtype = SERIAL_TYPE_NORMAL;
+        rocket_driver->init_termios = tty_std_termios;
+        rocket_driver->init_termios.c_cflag =
+            B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        rocket_driver->init_termios.c_ispeed = 9600;
+        rocket_driver->init_termios.c_ospeed = 9600;
+#ifdef ROCKET_SOFT_FLOW
+        rocket_driver->flags |= TTY_DRIVER_REAL_RAW;
+#endif
+        tty_set_operations(rocket_driver, &rocket_ops);
+
+        ret = tty_register_driver(rocket_driver);
+        if (ret < 0) {
+                printk(KERN_ERR "Couldn't install tty RocketPort driver\n");
+                goto err_controller;
+        }
+
+#ifdef ROCKET_DEBUG_OPEN
+        printk(KERN_INFO "RocketPort driver is major %d\n", rocket_driver.major);
+#endif
+
+        /*
+         *  OK, let's probe each of the controllers looking for boards.  Any boards found
+         *  will be initialized here.
+         */
+        isa_boards_found = 0;
+        pci_boards_found = 0;
+
+        for (i = 0; i < NUM_BOARDS; i++) {
+                if (init_ISA(i))
+                        isa_boards_found++;
+        }
+
+#ifdef CONFIG_PCI
+        if (isa_boards_found < NUM_BOARDS)
+                pci_boards_found = init_PCI(isa_boards_found);
+#endif
+
+        max_board = pci_boards_found + isa_boards_found;
+
+        if (max_board == 0) {
+                printk(KERN_ERR "No rocketport ports found; unloading driver\n");
+                ret = -ENXIO;
+                goto err_ttyu;
+        }
+
+        return 0;
+err_ttyu:
+        tty_unregister_driver(rocket_driver);
+err_controller:
+        if (controller)
+                release_region(controller, 4);
+err_tty:
+        put_tty_driver(rocket_driver);
+err:
+        return ret;
+}
+
+
+static void rp_cleanup_module(void)
+{
+        int retval;
+        int i;
+
+        del_timer_sync(&rocket_timer);
+
+        retval = tty_unregister_driver(rocket_driver);
+        if (retval)
+                printk(KERN_ERR "Error %d while trying to unregister "
+                       "rocketport driver\n", -retval);
+
+        for (i = 0; i < MAX_RP_PORTS; i++)
+                if (rp_table[i]) {
+                        tty_unregister_device(rocket_driver, i);
+                        kfree(rp_table[i]);
+                }
+
+        put_tty_driver(rocket_driver);
+
+        for (i = 0; i < NUM_BOARDS; i++) {
+                if (rcktpt_io_addr[i] <= 0 || is_PCI[i])
+                        continue;
+                release_region(rcktpt_io_addr[i], 64);
+        }
+        if (controller)
+                release_region(controller, 4);
+}
+
+/***************************************************************************
+Function: sInitController
+Purpose:  Initialization of controller global registers and controller
+          structure.
+Call:     sInitController(CtlP,CtlNum,MudbacIO,AiopIOList,AiopIOListSize,
+                          IRQNum,Frequency,PeriodicOnly)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+          int CtlNum; Controller number
+          ByteIO_t MudbacIO; Mudbac base I/O address.
+          ByteIO_t *AiopIOList; List of I/O addresses for each AIOP.
+             This list must be in the order the AIOPs will be found on the
+             controller.  Once an AIOP in the list is not found, it is
+             assumed that there are no more AIOPs on the controller.
+          int AiopIOListSize; Number of addresses in AiopIOList
+          int IRQNum; Interrupt Request number.  Can be any of the following:
+                         0: Disable global interrupts
+                         3: IRQ 3
+                         4: IRQ 4
+                         5: IRQ 5
+                         9: IRQ 9
+                         10: IRQ 10
+                         11: IRQ 11
+                         12: IRQ 12
+                         15: IRQ 15
+          Byte_t Frequency: A flag identifying the frequency
+                   of the periodic interrupt, can be any one of the following:
+                      FREQ_DIS - periodic interrupt disabled
+                      FREQ_137HZ - 137 Hertz
+                      FREQ_69HZ - 69 Hertz
+                      FREQ_34HZ - 34 Hertz
+                      FREQ_17HZ - 17 Hertz
+                      FREQ_9HZ - 9 Hertz
+                      FREQ_4HZ - 4 Hertz
+                   If IRQNum is set to 0 the Frequency parameter is
+                   overidden, it is forced to a value of FREQ_DIS.
+          int PeriodicOnly: 1 if all interrupts except the periodic
+                               interrupt are to be blocked.
+                            0 is both the periodic interrupt and
+                               other channel interrupts are allowed.
+                            If IRQNum is set to 0 the PeriodicOnly parameter is
+                               overidden, it is forced to a value of 0.
+Return:   int: Number of AIOPs on the controller, or CTLID_NULL if controller
+               initialization failed.
+
+Comments:
+          If periodic interrupts are to be disabled but AIOP interrupts
+          are allowed, set Frequency to FREQ_DIS and PeriodicOnly to 0.
+
+          If interrupts are to be completely disabled set IRQNum to 0.
+
+          Setting Frequency to FREQ_DIS and PeriodicOnly to 1 is an
+          invalid combination.
+
+          This function performs initialization of global interrupt modes,
+          but it does not actually enable global interrupts.  To enable
+          and disable global interrupts use functions sEnGlobalInt() and
+          sDisGlobalInt().  Enabling of global interrupts is normally not
+          done until all other initializations are complete.
+
+          Even if interrupts are globally enabled, they must also be
+          individually enabled for each channel that is to generate
+          interrupts.
+
+Warnings: No range checking on any of the parameters is done.
+
+          No context switches are allowed while executing this function.
+
+          After this function all AIOPs on the controller are disabled,
+          they can be enabled with sEnAiop().
+*/
+static int sInitController(CONTROLLER_T * CtlP, int CtlNum, ByteIO_t MudbacIO,
+                           ByteIO_t * AiopIOList, int AiopIOListSize,
+                           int IRQNum, Byte_t Frequency, int PeriodicOnly)
+{
+        int i;
+        ByteIO_t io;
+        int done;
+
+        CtlP->AiopIntrBits = aiop_intr_bits;
+        CtlP->AltChanRingIndicator = 0;
+        CtlP->CtlNum = CtlNum;
+        CtlP->CtlID = CTLID_0001;       /* controller release 1 */
+        CtlP->BusType = isISA;
+        CtlP->MBaseIO = MudbacIO;
+        CtlP->MReg1IO = MudbacIO + 1;
+        CtlP->MReg2IO = MudbacIO + 2;
+        CtlP->MReg3IO = MudbacIO + 3;
+#if 1
+        CtlP->MReg2 = 0;        /* interrupt disable */
+        CtlP->MReg3 = 0;        /* no periodic interrupts */
+#else
+        if (sIRQMap[IRQNum] == 0) {     /* interrupts globally disabled */
+                CtlP->MReg2 = 0;        /* interrupt disable */
+                CtlP->MReg3 = 0;        /* no periodic interrupts */
+        } else {
+                CtlP->MReg2 = sIRQMap[IRQNum];  /* set IRQ number */
+                CtlP->MReg3 = Frequency;        /* set frequency */
+                if (PeriodicOnly) {     /* periodic interrupt only */
+                        CtlP->MReg3 |= PERIODIC_ONLY;
+                }
+        }
+#endif
+        sOutB(CtlP->MReg2IO, CtlP->MReg2);
+        sOutB(CtlP->MReg3IO, CtlP->MReg3);
+        sControllerEOI(CtlP);   /* clear EOI if warm init */
+        /* Init AIOPs */
+        CtlP->NumAiop = 0;
+        for (i = done = 0; i < AiopIOListSize; i++) {
+                io = AiopIOList[i];
+                CtlP->AiopIO[i] = (WordIO_t) io;
+                CtlP->AiopIntChanIO[i] = io + _INT_CHAN;
+                sOutB(CtlP->MReg2IO, CtlP->MReg2 | (i & 0x03)); /* AIOP index */
+                sOutB(MudbacIO, (Byte_t) (io >> 6));    /* set up AIOP I/O in MUDBAC */
+                if (done)
+                        continue;
+                sEnAiop(CtlP, i);       /* enable the AIOP */
+                CtlP->AiopID[i] = sReadAiopID(io);      /* read AIOP ID */
+                if (CtlP->AiopID[i] == AIOPID_NULL)     /* if AIOP does not exist */
+                        done = 1;       /* done looking for AIOPs */
+                else {
+                        CtlP->AiopNumChan[i] = sReadAiopNumChan((WordIO_t) io); /* num channels in AIOP */
+                        sOutW((WordIO_t) io + _INDX_ADDR, _CLK_PRE);    /* clock prescaler */
+                        sOutB(io + _INDX_DATA, sClockPrescale);
+                        CtlP->NumAiop++;        /* bump count of AIOPs */
+                }
+                sDisAiop(CtlP, i);      /* disable AIOP */
+        }
+
+        if (CtlP->NumAiop == 0)
+                return (-1);
+        else
+                return (CtlP->NumAiop);
+}
+
+/***************************************************************************
+Function: sPCIInitController
+Purpose:  Initialization of controller global registers and controller
+          structure.
+Call:     sPCIInitController(CtlP,CtlNum,AiopIOList,AiopIOListSize,
+                          IRQNum,Frequency,PeriodicOnly)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+          int CtlNum; Controller number
+          ByteIO_t *AiopIOList; List of I/O addresses for each AIOP.
+             This list must be in the order the AIOPs will be found on the
+             controller.  Once an AIOP in the list is not found, it is
+             assumed that there are no more AIOPs on the controller.
+          int AiopIOListSize; Number of addresses in AiopIOList
+          int IRQNum; Interrupt Request number.  Can be any of the following:
+                         0: Disable global interrupts
+                         3: IRQ 3
+                         4: IRQ 4
+                         5: IRQ 5
+                         9: IRQ 9
+                         10: IRQ 10
+                         11: IRQ 11
+                         12: IRQ 12
+                         15: IRQ 15
+          Byte_t Frequency: A flag identifying the frequency
+                   of the periodic interrupt, can be any one of the following:
+                      FREQ_DIS - periodic interrupt disabled
+                      FREQ_137HZ - 137 Hertz
+                      FREQ_69HZ - 69 Hertz
+                      FREQ_34HZ - 34 Hertz
+                      FREQ_17HZ - 17 Hertz
+                      FREQ_9HZ - 9 Hertz
+                      FREQ_4HZ - 4 Hertz
+                   If IRQNum is set to 0 the Frequency parameter is
+                   overidden, it is forced to a value of FREQ_DIS.
+          int PeriodicOnly: 1 if all interrupts except the periodic
+                               interrupt are to be blocked.
+                            0 is both the periodic interrupt and
+                               other channel interrupts are allowed.
+                            If IRQNum is set to 0 the PeriodicOnly parameter is
+                               overidden, it is forced to a value of 0.
+Return:   int: Number of AIOPs on the controller, or CTLID_NULL if controller
+               initialization failed.
+
+Comments:
+          If periodic interrupts are to be disabled but AIOP interrupts
+          are allowed, set Frequency to FREQ_DIS and PeriodicOnly to 0.
+
+          If interrupts are to be completely disabled set IRQNum to 0.
+
+          Setting Frequency to FREQ_DIS and PeriodicOnly to 1 is an
+          invalid combination.
+
+          This function performs initialization of global interrupt modes,
+          but it does not actually enable global interrupts.  To enable
+          and disable global interrupts use functions sEnGlobalInt() and
+          sDisGlobalInt().  Enabling of global interrupts is normally not
+          done until all other initializations are complete.
+
+          Even if interrupts are globally enabled, they must also be
+          individually enabled for each channel that is to generate
+          interrupts.
+
+Warnings: No range checking on any of the parameters is done.
+
+          No context switches are allowed while executing this function.
+
+          After this function all AIOPs on the controller are disabled,
+          they can be enabled with sEnAiop().
+*/
+static int sPCIInitController(CONTROLLER_T * CtlP, int CtlNum,
+                              ByteIO_t * AiopIOList, int AiopIOListSize,
+                              WordIO_t ConfigIO, int IRQNum, Byte_t Frequency,
+                              int PeriodicOnly, int altChanRingIndicator,
+                              int UPCIRingInd)
+{
+        int i;
+        ByteIO_t io;
+
+        CtlP->AltChanRingIndicator = altChanRingIndicator;
+        CtlP->UPCIRingInd = UPCIRingInd;
+        CtlP->CtlNum = CtlNum;
+        CtlP->CtlID = CTLID_0001;       /* controller release 1 */
+        CtlP->BusType = isPCI;  /* controller release 1 */
+
+        if (ConfigIO) {
+                CtlP->isUPCI = 1;
+                CtlP->PCIIO = ConfigIO + _PCI_9030_INT_CTRL;
+                CtlP->PCIIO2 = ConfigIO + _PCI_9030_GPIO_CTRL;
+                CtlP->AiopIntrBits = upci_aiop_intr_bits;
+        } else {
+                CtlP->isUPCI = 0;
+                CtlP->PCIIO =
+                    (WordIO_t) ((ByteIO_t) AiopIOList[0] + _PCI_INT_FUNC);
+                CtlP->AiopIntrBits = aiop_intr_bits;
+        }
+
+        sPCIControllerEOI(CtlP);        /* clear EOI if warm init */
+        /* Init AIOPs */
+        CtlP->NumAiop = 0;
+        for (i = 0; i < AiopIOListSize; i++) {
+                io = AiopIOList[i];
+                CtlP->AiopIO[i] = (WordIO_t) io;
+                CtlP->AiopIntChanIO[i] = io + _INT_CHAN;
+
+                CtlP->AiopID[i] = sReadAiopID(io);      /* read AIOP ID */
+                if (CtlP->AiopID[i] == AIOPID_NULL)     /* if AIOP does not exist */
+                        break;  /* done looking for AIOPs */
+
+                CtlP->AiopNumChan[i] = sReadAiopNumChan((WordIO_t) io); /* num channels in AIOP */
+                sOutW((WordIO_t) io + _INDX_ADDR, _CLK_PRE);    /* clock prescaler */
+                sOutB(io + _INDX_DATA, sClockPrescale);
+                CtlP->NumAiop++;        /* bump count of AIOPs */
+        }
+
+        if (CtlP->NumAiop == 0)
+                return (-1);
+        else
+                return (CtlP->NumAiop);
+}
+
+/***************************************************************************
+Function: sReadAiopID
+Purpose:  Read the AIOP idenfication number directly from an AIOP.
+Call:     sReadAiopID(io)
+          ByteIO_t io: AIOP base I/O address
+Return:   int: Flag AIOPID_XXXX if a valid AIOP is found, where X
+                 is replace by an identifying number.
+          Flag AIOPID_NULL if no valid AIOP is found
+Warnings: No context switches are allowed while executing this function.
+
+*/
+static int sReadAiopID(ByteIO_t io)
+{
+        Byte_t AiopID;          /* ID byte from AIOP */
+
+        sOutB(io + _CMD_REG, RESET_ALL);        /* reset AIOP */
+        sOutB(io + _CMD_REG, 0x0);
+        AiopID = sInW(io + _CHN_STAT0) & 0x07;
+        if (AiopID == 0x06)
+                return (1);
+        else                    /* AIOP does not exist */
+                return (-1);
+}
+
+/***************************************************************************
+Function: sReadAiopNumChan
+Purpose:  Read the number of channels available in an AIOP directly from
+          an AIOP.
+Call:     sReadAiopNumChan(io)
+          WordIO_t io: AIOP base I/O address
+Return:   int: The number of channels available
+Comments: The number of channels is determined by write/reads from identical
+          offsets within the SRAM address spaces for channels 0 and 4.
+          If the channel 4 space is mirrored to channel 0 it is a 4 channel
+          AIOP, otherwise it is an 8 channel.
+Warnings: No context switches are allowed while executing this function.
+*/
+static int sReadAiopNumChan(WordIO_t io)
+{
+        Word_t x;
+        static Byte_t R[4] = { 0x00, 0x00, 0x34, 0x12 };
+
+        /* write to chan 0 SRAM */
+        out32((DWordIO_t) io + _INDX_ADDR, R);
+        sOutW(io + _INDX_ADDR, 0);      /* read from SRAM, chan 0 */
+        x = sInW(io + _INDX_DATA);
+        sOutW(io + _INDX_ADDR, 0x4000); /* read from SRAM, chan 4 */
+        if (x != sInW(io + _INDX_DATA)) /* if different must be 8 chan */
+                return (8);
+        else
+                return (4);
+}
+
+/***************************************************************************
+Function: sInitChan
+Purpose:  Initialization of a channel and channel structure
+Call:     sInitChan(CtlP,ChP,AiopNum,ChanNum)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+          CHANNEL_T *ChP; Ptr to channel structure
+          int AiopNum; AIOP number within controller
+          int ChanNum; Channel number within AIOP
+Return:   int: 1 if initialization succeeded, 0 if it fails because channel
+               number exceeds number of channels available in AIOP.
+Comments: This function must be called before a channel can be used.
+Warnings: No range checking on any of the parameters is done.
+
+          No context switches are allowed while executing this function.
+*/
+static int sInitChan(CONTROLLER_T * CtlP, CHANNEL_T * ChP, int AiopNum,
+                     int ChanNum)
+{
+        int i;
+        WordIO_t AiopIO;
+        WordIO_t ChIOOff;
+        Byte_t *ChR;
+        Word_t ChOff;
+        static Byte_t R[4];
+        int brd9600;
+
+        if (ChanNum >= CtlP->AiopNumChan[AiopNum])
+                return 0;       /* exceeds num chans in AIOP */
+
+        /* Channel, AIOP, and controller identifiers */
+        ChP->CtlP = CtlP;
+        ChP->ChanID = CtlP->AiopID[AiopNum];
+        ChP->AiopNum = AiopNum;
+        ChP->ChanNum = ChanNum;
+
+        /* Global direct addresses */
+        AiopIO = CtlP->AiopIO[AiopNum];
+        ChP->Cmd = (ByteIO_t) AiopIO + _CMD_REG;
+        ChP->IntChan = (ByteIO_t) AiopIO + _INT_CHAN;
+        ChP->IntMask = (ByteIO_t) AiopIO + _INT_MASK;
+        ChP->IndexAddr = (DWordIO_t) AiopIO + _INDX_ADDR;
+        ChP->IndexData = AiopIO + _INDX_DATA;
+
+        /* Channel direct addresses */
+        ChIOOff = AiopIO + ChP->ChanNum * 2;
+        ChP->TxRxData = ChIOOff + _TD0;
+        ChP->ChanStat = ChIOOff + _CHN_STAT0;
+        ChP->TxRxCount = ChIOOff + _FIFO_CNT0;
+        ChP->IntID = (ByteIO_t) AiopIO + ChP->ChanNum + _INT_ID0;
+
+        /* Initialize the channel from the RData array */
+        for (i = 0; i < RDATASIZE; i += 4) {
+                R[0] = RData[i];
+                R[1] = RData[i + 1] + 0x10 * ChanNum;
+                R[2] = RData[i + 2];
+                R[3] = RData[i + 3];
+                out32(ChP->IndexAddr, R);
+        }
+
+        ChR = ChP->R;
+        for (i = 0; i < RREGDATASIZE; i += 4) {
+                ChR[i] = RRegData[i];
+                ChR[i + 1] = RRegData[i + 1] + 0x10 * ChanNum;
+                ChR[i + 2] = RRegData[i + 2];
+                ChR[i + 3] = RRegData[i + 3];
+        }
+
+        /* Indexed registers */
+        ChOff = (Word_t) ChanNum *0x1000;
+
+        if (sClockPrescale == 0x14)
+                brd9600 = 47;
+        else
+                brd9600 = 23;
+
+        ChP->BaudDiv[0] = (Byte_t) (ChOff + _BAUD);
+        ChP->BaudDiv[1] = (Byte_t) ((ChOff + _BAUD) >> 8);
+        ChP->BaudDiv[2] = (Byte_t) brd9600;
+        ChP->BaudDiv[3] = (Byte_t) (brd9600 >> 8);
+        out32(ChP->IndexAddr, ChP->BaudDiv);
+
+        ChP->TxControl[0] = (Byte_t) (ChOff + _TX_CTRL);
+        ChP->TxControl[1] = (Byte_t) ((ChOff + _TX_CTRL) >> 8);
+        ChP->TxControl[2] = 0;
+        ChP->TxControl[3] = 0;
+        out32(ChP->IndexAddr, ChP->TxControl);
+
+        ChP->RxControl[0] = (Byte_t) (ChOff + _RX_CTRL);
+        ChP->RxControl[1] = (Byte_t) ((ChOff + _RX_CTRL) >> 8);
+        ChP->RxControl[2] = 0;
+        ChP->RxControl[3] = 0;
+        out32(ChP->IndexAddr, ChP->RxControl);
+
+        ChP->TxEnables[0] = (Byte_t) (ChOff + _TX_ENBLS);
+        ChP->TxEnables[1] = (Byte_t) ((ChOff + _TX_ENBLS) >> 8);
+        ChP->TxEnables[2] = 0;
+        ChP->TxEnables[3] = 0;
+        out32(ChP->IndexAddr, ChP->TxEnables);
+
+        ChP->TxCompare[0] = (Byte_t) (ChOff + _TXCMP1);
+        ChP->TxCompare[1] = (Byte_t) ((ChOff + _TXCMP1) >> 8);
+        ChP->TxCompare[2] = 0;
+        ChP->TxCompare[3] = 0;
+        out32(ChP->IndexAddr, ChP->TxCompare);
+
+        ChP->TxReplace1[0] = (Byte_t) (ChOff + _TXREP1B1);
+        ChP->TxReplace1[1] = (Byte_t) ((ChOff + _TXREP1B1) >> 8);
+        ChP->TxReplace1[2] = 0;
+        ChP->TxReplace1[3] = 0;
+        out32(ChP->IndexAddr, ChP->TxReplace1);
+
+        ChP->TxReplace2[0] = (Byte_t) (ChOff + _TXREP2);
+        ChP->TxReplace2[1] = (Byte_t) ((ChOff + _TXREP2) >> 8);
+        ChP->TxReplace2[2] = 0;
+        ChP->TxReplace2[3] = 0;
+        out32(ChP->IndexAddr, ChP->TxReplace2);
+
+        ChP->TxFIFOPtrs = ChOff + _TXF_OUTP;
+        ChP->TxFIFO = ChOff + _TX_FIFO;
+
+        sOutB(ChP->Cmd, (Byte_t) ChanNum | RESTXFCNT);  /* apply reset Tx FIFO count */
+        sOutB(ChP->Cmd, (Byte_t) ChanNum);      /* remove reset Tx FIFO count */
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->TxFIFOPtrs);      /* clear Tx in/out ptrs */
+        sOutW(ChP->IndexData, 0);
+        ChP->RxFIFOPtrs = ChOff + _RXF_OUTP;
+        ChP->RxFIFO = ChOff + _RX_FIFO;
+
+        sOutB(ChP->Cmd, (Byte_t) ChanNum | RESRXFCNT);  /* apply reset Rx FIFO count */
+        sOutB(ChP->Cmd, (Byte_t) ChanNum);      /* remove reset Rx FIFO count */
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->RxFIFOPtrs);      /* clear Rx out ptr */
+        sOutW(ChP->IndexData, 0);
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->RxFIFOPtrs + 2);  /* clear Rx in ptr */
+        sOutW(ChP->IndexData, 0);
+        ChP->TxPrioCnt = ChOff + _TXP_CNT;
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->TxPrioCnt);
+        sOutB(ChP->IndexData, 0);
+        ChP->TxPrioPtr = ChOff + _TXP_PNTR;
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->TxPrioPtr);
+        sOutB(ChP->IndexData, 0);
+        ChP->TxPrioBuf = ChOff + _TXP_BUF;
+        sEnRxProcessor(ChP);    /* start the Rx processor */
+
+        return 1;
+}
+
+/***************************************************************************
+Function: sStopRxProcessor
+Purpose:  Stop the receive processor from processing a channel.
+Call:     sStopRxProcessor(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+
+Comments: The receive processor can be started again with sStartRxProcessor().
+          This function causes the receive processor to skip over the
+          stopped channel.  It does not stop it from processing other channels.
+
+Warnings: No context switches are allowed while executing this function.
+
+          Do not leave the receive processor stopped for more than one
+          character time.
+
+          After calling this function a delay of 4 uS is required to ensure
+          that the receive processor is no longer processing this channel.
+*/
+static void sStopRxProcessor(CHANNEL_T * ChP)
+{
+        Byte_t R[4];
+
+        R[0] = ChP->R[0];
+        R[1] = ChP->R[1];
+        R[2] = 0x0a;
+        R[3] = ChP->R[3];
+        out32(ChP->IndexAddr, R);
+}
+
+/***************************************************************************
+Function: sFlushRxFIFO
+Purpose:  Flush the Rx FIFO
+Call:     sFlushRxFIFO(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   void
+Comments: To prevent data from being enqueued or dequeued in the Tx FIFO
+          while it is being flushed the receive processor is stopped
+          and the transmitter is disabled.  After these operations a
+          4 uS delay is done before clearing the pointers to allow
+          the receive processor to stop.  These items are handled inside
+          this function.
+Warnings: No context switches are allowed while executing this function.
+*/
+static void sFlushRxFIFO(CHANNEL_T * ChP)
+{
+        int i;
+        Byte_t Ch;              /* channel number within AIOP */
+        int RxFIFOEnabled;      /* 1 if Rx FIFO enabled */
+
+        if (sGetRxCnt(ChP) == 0)        /* Rx FIFO empty */
+                return;         /* don't need to flush */
+
+        RxFIFOEnabled = 0;
+        if (ChP->R[0x32] == 0x08) {     /* Rx FIFO is enabled */
+                RxFIFOEnabled = 1;
+                sDisRxFIFO(ChP);        /* disable it */
+                for (i = 0; i < 2000 / 200; i++)        /* delay 2 uS to allow proc to disable FIFO */
+                        sInB(ChP->IntChan);     /* depends on bus i/o timing */
+        }
+        sGetChanStatus(ChP);    /* clear any pending Rx errors in chan stat */
+        Ch = (Byte_t) sGetChanNum(ChP);
+        sOutB(ChP->Cmd, Ch | RESRXFCNT);        /* apply reset Rx FIFO count */
+        sOutB(ChP->Cmd, Ch);    /* remove reset Rx FIFO count */
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->RxFIFOPtrs);      /* clear Rx out ptr */
+        sOutW(ChP->IndexData, 0);
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->RxFIFOPtrs + 2);  /* clear Rx in ptr */
+        sOutW(ChP->IndexData, 0);
+        if (RxFIFOEnabled)
+                sEnRxFIFO(ChP); /* enable Rx FIFO */
+}
+
+/***************************************************************************
+Function: sFlushTxFIFO
+Purpose:  Flush the Tx FIFO
+Call:     sFlushTxFIFO(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   void
+Comments: To prevent data from being enqueued or dequeued in the Tx FIFO
+          while it is being flushed the receive processor is stopped
+          and the transmitter is disabled.  After these operations a
+          4 uS delay is done before clearing the pointers to allow
+          the receive processor to stop.  These items are handled inside
+          this function.
+Warnings: No context switches are allowed while executing this function.
+*/
+static void sFlushTxFIFO(CHANNEL_T * ChP)
+{
+        int i;
+        Byte_t Ch;              /* channel number within AIOP */
+        int TxEnabled;          /* 1 if transmitter enabled */
+
+        if (sGetTxCnt(ChP) == 0)        /* Tx FIFO empty */
+                return;         /* don't need to flush */
+
+        TxEnabled = 0;
+        if (ChP->TxControl[3] & TX_ENABLE) {
+                TxEnabled = 1;
+                sDisTransmit(ChP);      /* disable transmitter */
+        }
+        sStopRxProcessor(ChP);  /* stop Rx processor */
+        for (i = 0; i < 4000 / 200; i++)        /* delay 4 uS to allow proc to stop */
+                sInB(ChP->IntChan);     /* depends on bus i/o timing */
+        Ch = (Byte_t) sGetChanNum(ChP);
+        sOutB(ChP->Cmd, Ch | RESTXFCNT);        /* apply reset Tx FIFO count */
+        sOutB(ChP->Cmd, Ch);    /* remove reset Tx FIFO count */
+        sOutW((WordIO_t) ChP->IndexAddr, ChP->TxFIFOPtrs);      /* clear Tx in/out ptrs */
+        sOutW(ChP->IndexData, 0);
+        if (TxEnabled)
+                sEnTransmit(ChP);       /* enable transmitter */
+        sStartRxProcessor(ChP); /* restart Rx processor */
+}
+
+/***************************************************************************
+Function: sWriteTxPrioByte
+Purpose:  Write a byte of priority transmit data to a channel
+Call:     sWriteTxPrioByte(ChP,Data)
+          CHANNEL_T *ChP; Ptr to channel structure
+          Byte_t Data; The transmit data byte
+
+Return:   int: 1 if the bytes is successfully written, otherwise 0.
+
+Comments: The priority byte is transmitted before any data in the Tx FIFO.
+
+Warnings: No context switches are allowed while executing this function.
+*/
+static int sWriteTxPrioByte(CHANNEL_T * ChP, Byte_t Data)
+{
+        Byte_t DWBuf[4];        /* buffer for double word writes */
+        Word_t *WordPtr;        /* must be far because Win SS != DS */
+        register DWordIO_t IndexAddr;
+
+        if (sGetTxCnt(ChP) > 1) {       /* write it to Tx priority buffer */
+                IndexAddr = ChP->IndexAddr;
+                sOutW((WordIO_t) IndexAddr, ChP->TxPrioCnt);    /* get priority buffer status */
+                if (sInB((ByteIO_t) ChP->IndexData) & PRI_PEND) /* priority buffer busy */
+                        return (0);     /* nothing sent */
+
+                WordPtr = (Word_t *) (&DWBuf[0]);
+                *WordPtr = ChP->TxPrioBuf;      /* data byte address */
+
+                DWBuf[2] = Data;        /* data byte value */
+                out32(IndexAddr, DWBuf);        /* write it out */
+
+                *WordPtr = ChP->TxPrioCnt;      /* Tx priority count address */
+
+                DWBuf[2] = PRI_PEND + 1;        /* indicate 1 byte pending */
+                DWBuf[3] = 0;   /* priority buffer pointer */
+                out32(IndexAddr, DWBuf);        /* write it out */
+        } else {                /* write it to Tx FIFO */
+
+                sWriteTxByte(sGetTxRxDataIO(ChP), Data);
+        }
+        return (1);             /* 1 byte sent */
+}
+
+/***************************************************************************
+Function: sEnInterrupts
+Purpose:  Enable one or more interrupts for a channel
+Call:     sEnInterrupts(ChP,Flags)
+          CHANNEL_T *ChP; Ptr to channel structure
+          Word_t Flags: Interrupt enable flags, can be any combination
+             of the following flags:
+                TXINT_EN:   Interrupt on Tx FIFO empty
+                RXINT_EN:   Interrupt on Rx FIFO at trigger level (see
+                            sSetRxTrigger())
+                SRCINT_EN:  Interrupt on SRC (Special Rx Condition)
+                MCINT_EN:   Interrupt on modem input change
+                CHANINT_EN: Allow channel interrupt signal to the AIOP's
+                            Interrupt Channel Register.
+Return:   void
+Comments: If an interrupt enable flag is set in Flags, that interrupt will be
+          enabled.  If an interrupt enable flag is not set in Flags, that
+          interrupt will not be changed.  Interrupts can be disabled with
+          function sDisInterrupts().
+
+          This function sets the appropriate bit for the channel in the AIOP's
+          Interrupt Mask Register if the CHANINT_EN flag is set.  This allows
+          this channel's bit to be set in the AIOP's Interrupt Channel Register.
+
+          Interrupts must also be globally enabled before channel interrupts
+          will be passed on to the host.  This is done with function
+          sEnGlobalInt().
+
+          In some cases it may be desirable to disable interrupts globally but
+          enable channel interrupts.  This would allow the global interrupt
+          status register to be used to determine which AIOPs need service.
+*/
+static void sEnInterrupts(CHANNEL_T * ChP, Word_t Flags)
+{
+        Byte_t Mask;            /* Interrupt Mask Register */
+
+        ChP->RxControl[2] |=
+            ((Byte_t) Flags & (RXINT_EN | SRCINT_EN | MCINT_EN));
+
+        out32(ChP->IndexAddr, ChP->RxControl);
+
+        ChP->TxControl[2] |= ((Byte_t) Flags & TXINT_EN);
+
+        out32(ChP->IndexAddr, ChP->TxControl);
+
+        if (Flags & CHANINT_EN) {
+                Mask = sInB(ChP->IntMask) | sBitMapSetTbl[ChP->ChanNum];
+                sOutB(ChP->IntMask, Mask);
+        }
+}
+
+/***************************************************************************
+Function: sDisInterrupts
+Purpose:  Disable one or more interrupts for a channel
+Call:     sDisInterrupts(ChP,Flags)
+          CHANNEL_T *ChP; Ptr to channel structure
+          Word_t Flags: Interrupt flags, can be any combination
+             of the following flags:
+                TXINT_EN:   Interrupt on Tx FIFO empty
+                RXINT_EN:   Interrupt on Rx FIFO at trigger level (see
+                            sSetRxTrigger())
+                SRCINT_EN:  Interrupt on SRC (Special Rx Condition)
+                MCINT_EN:   Interrupt on modem input change
+                CHANINT_EN: Disable channel interrupt signal to the
+                            AIOP's Interrupt Channel Register.
+Return:   void
+Comments: If an interrupt flag is set in Flags, that interrupt will be
+          disabled.  If an interrupt flag is not set in Flags, that
+          interrupt will not be changed.  Interrupts can be enabled with
+          function sEnInterrupts().
+
+          This function clears the appropriate bit for the channel in the AIOP's
+          Interrupt Mask Register if the CHANINT_EN flag is set.  This blocks
+          this channel's bit from being set in the AIOP's Interrupt Channel
+          Register.
+*/
+static void sDisInterrupts(CHANNEL_T * ChP, Word_t Flags)
+{
+        Byte_t Mask;            /* Interrupt Mask Register */
+
+        ChP->RxControl[2] &=
+            ~((Byte_t) Flags & (RXINT_EN | SRCINT_EN | MCINT_EN));
+        out32(ChP->IndexAddr, ChP->RxControl);
+        ChP->TxControl[2] &= ~((Byte_t) Flags & TXINT_EN);
+        out32(ChP->IndexAddr, ChP->TxControl);
+
+        if (Flags & CHANINT_EN) {
+                Mask = sInB(ChP->IntMask) & sBitMapClrTbl[ChP->ChanNum];
+                sOutB(ChP->IntMask, Mask);
+        }
+}
+
+static void sSetInterfaceMode(CHANNEL_T * ChP, Byte_t mode)
+{
+        sOutB(ChP->CtlP->AiopIO[2], (mode & 0x18) | ChP->ChanNum);
+}
+
+/*
+ *  Not an official SSCI function, but how to reset RocketModems.
+ *  ISA bus version
+ */
+static void sModemReset(CONTROLLER_T * CtlP, int chan, int on)
+{
+        ByteIO_t addr;
+        Byte_t val;
+
+        addr = CtlP->AiopIO[0] + 0x400;
+        val = sInB(CtlP->MReg3IO);
+        /* if AIOP[1] is not enabled, enable it */
+        if ((val & 2) == 0) {
+                val = sInB(CtlP->MReg2IO);
+                sOutB(CtlP->MReg2IO, (val & 0xfc) | (1 & 0x03));
+                sOutB(CtlP->MBaseIO, (unsigned char) (addr >> 6));
+        }
+
+        sEnAiop(CtlP, 1);
+        if (!on)
+                addr += 8;
+        sOutB(addr + chan, 0);  /* apply or remove reset */
+        sDisAiop(CtlP, 1);
+}
+
+/*
+ *  Not an official SSCI function, but how to reset RocketModems.
+ *  PCI bus version
+ */
+static void sPCIModemReset(CONTROLLER_T * CtlP, int chan, int on)
+{
+        ByteIO_t addr;
+
+        addr = CtlP->AiopIO[0] + 0x40;  /* 2nd AIOP */
+        if (!on)
+                addr += 8;
+        sOutB(addr + chan, 0);  /* apply or remove reset */
+}
+
+/*  Resets the speaker controller on RocketModem II and III devices */
+static void rmSpeakerReset(CONTROLLER_T * CtlP, unsigned long model)
+{
+        ByteIO_t addr;
+
+        /* RocketModem II speaker control is at the 8th port location of offset 0x40 */
+        if ((model == MODEL_RP4M) || (model == MODEL_RP6M)) {
+                addr = CtlP->AiopIO[0] + 0x4F;
+                sOutB(addr, 0);
+        }
+
+        /* RocketModem III speaker control is at the 1st port location of offset 0x80 */
+        if ((model == MODEL_UPCI_RM3_8PORT)
+            || (model == MODEL_UPCI_RM3_4PORT)) {
+                addr = CtlP->AiopIO[0] + 0x88;
+                sOutB(addr, 0);
+        }
+}
+
+/*  Returns the line number given the controller (board), aiop and channel number */
+static unsigned char GetLineNumber(int ctrl, int aiop, int ch)
+{
+        return lineNumbers[(ctrl << 5) | (aiop << 3) | ch];
+}
+
+/*
+ *  Stores the line number associated with a given controller (board), aiop
+ *  and channel number.  
+ *  Returns:  The line number assigned 
+ */
+static unsigned char SetLineNumber(int ctrl, int aiop, int ch)
+{
+        lineNumbers[(ctrl << 5) | (aiop << 3) | ch] = nextLineNumber++;
+        return (nextLineNumber - 1);
+}
diff --git a/drivers/tty/rocket.h b/drivers/tty/rocket.h
new file mode 100644
index 000000000000..ec863f35f1a9
--- /dev/null
+++ b/drivers/tty/rocket.h
@@ -0,0 +1,111 @@
+/*
+ * rocket.h --- the exported interface of the rocket driver to its configuration program.
+ *
+ * Written by Theodore Ts'o, Copyright 1997.
+ * Copyright 1997 Comtrol Corporation. 
+ *
+ */
+
+/*  Model Information Struct */
+typedef struct {
+        unsigned long model;
+        char modelString[80];
+        unsigned long numPorts;
+        int loadrm2;
+        int startingPortNumber;
+} rocketModel_t;
+
+struct rocket_config {
+        int line;
+        int flags;
+        int closing_wait;
+        int close_delay;
+        int port;
+        int reserved[32];
+};
+
+struct rocket_ports {
+        int tty_major;
+        int callout_major;
+        rocketModel_t rocketModel[8];
+};
+
+struct rocket_version {
+        char rocket_version[32];
+        char rocket_date[32];
+        char reserved[64];
+};
+
+/*
+ * Rocketport flags
+ */
+/*#define ROCKET_CALLOUT_NOHUP    0x00000001 */
+#define ROCKET_FORCE_CD         0x00000002
+#define ROCKET_HUP_NOTIFY       0x00000004
+#define ROCKET_SPLIT_TERMIOS    0x00000008
+#define ROCKET_SPD_MASK         0x00000070
+#define ROCKET_SPD_HI           0x00000010      /* Use 56000 instead of 38400 bps */
+#define ROCKET_SPD_VHI          0x00000020      /* Use 115200 instead of 38400 bps */
+#define ROCKET_SPD_SHI          0x00000030      /* Use 230400 instead of 38400 bps */
+#define ROCKET_SPD_WARP         0x00000040      /* Use 460800 instead of 38400 bps */
+#define ROCKET_SAK              0x00000080
+#define ROCKET_SESSION_LOCKOUT  0x00000100
+#define ROCKET_PGRP_LOCKOUT     0x00000200
+#define ROCKET_RTS_TOGGLE       0x00000400
+#define ROCKET_MODE_MASK        0x00003000
+#define ROCKET_MODE_RS232       0x00000000
+#define ROCKET_MODE_RS485       0x00001000
+#define ROCKET_MODE_RS422       0x00002000
+#define ROCKET_FLAGS            0x00003FFF
+
+#define ROCKET_USR_MASK 0x0071  /* Legal flags that non-privileged
+                                 * users can set or reset */
+
+/*
+ * For closing_wait and closing_wait2
+ */
+#define ROCKET_CLOSING_WAIT_NONE        ASYNC_CLOSING_WAIT_NONE
+#define ROCKET_CLOSING_WAIT_INF         ASYNC_CLOSING_WAIT_INF
+
+/*
+ * Rocketport ioctls -- "RP"
+ */
+#define RCKP_GET_STRUCT         0x00525001
+#define RCKP_GET_CONFIG         0x00525002
+#define RCKP_SET_CONFIG         0x00525003
+#define RCKP_GET_PORTS          0x00525004
+#define RCKP_RESET_RM2          0x00525005
+#define RCKP_GET_VERSION        0x00525006
+
+/*  Rocketport Models */
+#define MODEL_RP32INTF        0x0001    /* RP 32 port w/external I/F   */
+#define MODEL_RP8INTF         0x0002    /* RP 8 port w/external I/F    */
+#define MODEL_RP16INTF        0x0003    /* RP 16 port w/external I/F   */
+#define MODEL_RP8OCTA         0x0005    /* RP 8 port w/octa cable      */
+#define MODEL_RP4QUAD         0x0004    /* RP 4 port w/quad cable      */
+#define MODEL_RP8J            0x0006    /* RP 8 port w/RJ11 connectors */
+#define MODEL_RP4J            0x0007    /* RP 4 port w/RJ45 connectors */
+#define MODEL_RP8SNI          0x0008    /* RP 8 port w/ DB78 SNI connector */
+#define MODEL_RP16SNI         0x0009    /* RP 16 port w/ DB78 SNI connector */
+#define MODEL_RPP4            0x000A    /* RP Plus 4 port              */
+#define MODEL_RPP8            0x000B    /* RP Plus 8 port              */
+#define MODEL_RP2_232         0x000E    /* RP Plus 2 port RS232        */
+#define MODEL_RP2_422         0x000F    /* RP Plus 2 port RS232        */
+
+/*  Rocketmodem II Models */
+#define MODEL_RP6M            0x000C    /* RM 6 port                   */
+#define MODEL_RP4M            0x000D    /* RM 4 port                   */
+
+/* Universal PCI boards */
+#define MODEL_UPCI_RP32INTF   0x0801    /* RP UPCI 32 port w/external I/F     */
+#define MODEL_UPCI_RP8INTF    0x0802    /* RP UPCI 8 port w/external I/F      */
+#define MODEL_UPCI_RP16INTF   0x0803    /* RP UPCI 16 port w/external I/F     */
+#define MODEL_UPCI_RP8OCTA    0x0805    /* RP UPCI 8 port w/octa cable        */ 
+#define MODEL_UPCI_RM3_8PORT  0x080C    /* RP UPCI Rocketmodem III 8 port     */
+#define MODEL_UPCI_RM3_4PORT  0x080C    /* RP UPCI Rocketmodem III 4 port     */
+
+/*  Compact PCI 16 port  */
+#define MODEL_CPCI_RP16INTF   0x0903    /* RP Compact PCI 16 port w/external I/F */
+
+/* All ISA boards */
+#define MODEL_ISA             0x1000
diff --git a/drivers/tty/rocket_int.h b/drivers/tty/rocket_int.h
new file mode 100644
index 000000000000..67e0f1e778a2
--- /dev/null
+++ b/drivers/tty/rocket_int.h
@@ -0,0 +1,1214 @@
+/*
+ * rocket_int.h --- internal header file for rocket.c
+ *
+ * Written by Theodore Ts'o, Copyright 1997.
+ * Copyright 1997 Comtrol Corporation.  
+ * 
+ */
+
+/*
+ * Definition of the types in rcktpt_type
+ */
+#define ROCKET_TYPE_NORMAL      0
+#define ROCKET_TYPE_MODEM       1
+#define ROCKET_TYPE_MODEMII     2
+#define ROCKET_TYPE_MODEMIII    3
+#define ROCKET_TYPE_PC104       4
+
+#include <linux/mutex.h>
+
+#include <asm/io.h>
+#include <asm/byteorder.h>
+
+typedef unsigned char Byte_t;
+typedef unsigned int ByteIO_t;
+
+typedef unsigned int Word_t;
+typedef unsigned int WordIO_t;
+
+typedef unsigned int DWordIO_t;
+
+/*
+ * Note!  Normally the Linux I/O macros already take care of
+ * byte-swapping the I/O instructions.  However, all accesses using
+ * sOutDW aren't really 32-bit accesses, but should be handled in byte
+ * order.  Hence the use of the cpu_to_le32() macro to byte-swap
+ * things to no-op the byte swapping done by the big-endian outl()
+ * instruction.
+ */
+
+static inline void sOutB(unsigned short port, unsigned char value)
+{
+#ifdef ROCKET_DEBUG_IO
+        printk(KERN_DEBUG "sOutB(%x, %x)...\n", port, value);
+#endif
+        outb_p(value, port);
+}
+
+static inline void sOutW(unsigned short port, unsigned short value)
+{
+#ifdef ROCKET_DEBUG_IO
+        printk(KERN_DEBUG "sOutW(%x, %x)...\n", port, value);
+#endif
+        outw_p(value, port);
+}
+
+static inline void out32(unsigned short port, Byte_t *p)
+{
+        u32 value = get_unaligned_le32(p);
+#ifdef ROCKET_DEBUG_IO
+        printk(KERN_DEBUG "out32(%x, %lx)...\n", port, value);
+#endif
+        outl_p(value, port);
+}
+
+static inline unsigned char sInB(unsigned short port)
+{
+        return inb_p(port);
+}
+
+static inline unsigned short sInW(unsigned short port)
+{
+        return inw_p(port);
+}
+
+/* This is used to move arrays of bytes so byte swapping isn't appropriate. */
+#define sOutStrW(port, addr, count) if (count) outsw(port, addr, count)
+#define sInStrW(port, addr, count) if (count) insw(port, addr, count)
+
+#define CTL_SIZE 8
+#define AIOP_CTL_SIZE 4
+#define CHAN_AIOP_SIZE 8
+#define MAX_PORTS_PER_AIOP 8
+#define MAX_AIOPS_PER_BOARD 4
+#define MAX_PORTS_PER_BOARD 32
+
+/* Bus type ID */
+#define isISA   0
+#define isPCI   1
+#define isMC    2
+
+/* Controller ID numbers */
+#define CTLID_NULL  -1          /* no controller exists */
+#define CTLID_0001  0x0001      /* controller release 1 */
+
+/* AIOP ID numbers, identifies AIOP type implementing channel */
+#define AIOPID_NULL -1          /* no AIOP or channel exists */
+#define AIOPID_0001 0x0001      /* AIOP release 1 */
+
+/************************************************************************
+ Global Register Offsets - Direct Access - Fixed values
+************************************************************************/
+
+#define _CMD_REG   0x38         /* Command Register            8    Write */
+#define _INT_CHAN  0x39         /* Interrupt Channel Register  8    Read */
+#define _INT_MASK  0x3A         /* Interrupt Mask Register     8    Read / Write */
+#define _UNUSED    0x3B         /* Unused                      8 */
+#define _INDX_ADDR 0x3C         /* Index Register Address      16   Write */
+#define _INDX_DATA 0x3E         /* Index Register Data         8/16 Read / Write */
+
+/************************************************************************
+ Channel Register Offsets for 1st channel in AIOP - Direct Access
+************************************************************************/
+#define _TD0       0x00         /* Transmit Data               16   Write */
+#define _RD0       0x00         /* Receive Data                16   Read */
+#define _CHN_STAT0 0x20         /* Channel Status              8/16 Read / Write */
+#define _FIFO_CNT0 0x10         /* Transmit/Receive FIFO Count 16   Read */
+#define _INT_ID0   0x30         /* Interrupt Identification    8    Read */
+
+/************************************************************************
+ Tx Control Register Offsets - Indexed - External - Fixed
+************************************************************************/
+#define _TX_ENBLS  0x980        /* Tx Processor Enables Register 8 Read / Write */
+#define _TXCMP1    0x988        /* Transmit Compare Value #1     8 Read / Write */
+#define _TXCMP2    0x989        /* Transmit Compare Value #2     8 Read / Write */
+#define _TXREP1B1  0x98A        /* Tx Replace Value #1 - Byte 1  8 Read / Write */
+#define _TXREP1B2  0x98B        /* Tx Replace Value #1 - Byte 2  8 Read / Write */
+#define _TXREP2    0x98C        /* Transmit Replace Value #2     8 Read / Write */
+
+/************************************************************************
+Memory Controller Register Offsets - Indexed - External - Fixed
+************************************************************************/
+#define _RX_FIFO    0x000       /* Rx FIFO */
+#define _TX_FIFO    0x800       /* Tx FIFO */
+#define _RXF_OUTP   0x990       /* Rx FIFO OUT pointer        16 Read / Write */
+#define _RXF_INP    0x992       /* Rx FIFO IN pointer         16 Read / Write */
+#define _TXF_OUTP   0x994       /* Tx FIFO OUT pointer        8  Read / Write */
+#define _TXF_INP    0x995       /* Tx FIFO IN pointer         8  Read / Write */
+#define _TXP_CNT    0x996       /* Tx Priority Count          8  Read / Write */
+#define _TXP_PNTR   0x997       /* Tx Priority Pointer        8  Read / Write */
+
+#define PRI_PEND    0x80        /* Priority data pending (bit7, Tx pri cnt) */
+#define TXFIFO_SIZE 255         /* size of Tx FIFO */
+#define RXFIFO_SIZE 1023        /* size of Rx FIFO */
+
+/************************************************************************
+Tx Priority Buffer - Indexed - External - Fixed
+************************************************************************/
+#define _TXP_BUF    0x9C0       /* Tx Priority Buffer  32  Bytes   Read / Write */
+#define TXP_SIZE    0x20        /* 32 bytes */
+
+/************************************************************************
+Channel Register Offsets - Indexed - Internal - Fixed
+************************************************************************/
+
+#define _TX_CTRL    0xFF0       /* Transmit Control               16  Write */
+#define _RX_CTRL    0xFF2       /* Receive Control                 8  Write */
+#define _BAUD       0xFF4       /* Baud Rate                      16  Write */
+#define _CLK_PRE    0xFF6       /* Clock Prescaler                 8  Write */
+
+#define STMBREAK   0x08         /* BREAK */
+#define STMFRAME   0x04         /* framing error */
+#define STMRCVROVR 0x02         /* receiver over run error */
+#define STMPARITY  0x01         /* parity error */
+#define STMERROR   (STMBREAK | STMFRAME | STMPARITY)
+#define STMBREAKH   0x800       /* BREAK */
+#define STMFRAMEH   0x400       /* framing error */
+#define STMRCVROVRH 0x200       /* receiver over run error */
+#define STMPARITYH  0x100       /* parity error */
+#define STMERRORH   (STMBREAKH | STMFRAMEH | STMPARITYH)
+
+#define CTS_ACT   0x20          /* CTS input asserted */
+#define DSR_ACT   0x10          /* DSR input asserted */
+#define CD_ACT    0x08          /* CD input asserted */
+#define TXFIFOMT  0x04          /* Tx FIFO is empty */
+#define TXSHRMT   0x02          /* Tx shift register is empty */
+#define RDA       0x01          /* Rx data available */
+#define DRAINED (TXFIFOMT | TXSHRMT)    /* indicates Tx is drained */
+
+#define STATMODE  0x8000        /* status mode enable bit */
+#define RXFOVERFL 0x2000        /* receive FIFO overflow */
+#define RX2MATCH  0x1000        /* receive compare byte 2 match */
+#define RX1MATCH  0x0800        /* receive compare byte 1 match */
+#define RXBREAK   0x0400        /* received BREAK */
+#define RXFRAME   0x0200        /* received framing error */
+#define RXPARITY  0x0100        /* received parity error */
+#define STATERROR (RXBREAK | RXFRAME | RXPARITY)
+
+#define CTSFC_EN  0x80          /* CTS flow control enable bit */
+#define RTSTOG_EN 0x40          /* RTS toggle enable bit */
+#define TXINT_EN  0x10          /* transmit interrupt enable */
+#define STOP2     0x08          /* enable 2 stop bits (0 = 1 stop) */
+#define PARITY_EN 0x04          /* enable parity (0 = no parity) */
+#define EVEN_PAR  0x02          /* even parity (0 = odd parity) */
+#define DATA8BIT  0x01          /* 8 bit data (0 = 7 bit data) */
+
+#define SETBREAK  0x10          /* send break condition (must clear) */
+#define LOCALLOOP 0x08          /* local loopback set for test */
+#define SET_DTR   0x04          /* assert DTR */
+#define SET_RTS   0x02          /* assert RTS */
+#define TX_ENABLE 0x01          /* enable transmitter */
+
+#define RTSFC_EN  0x40          /* RTS flow control enable */
+#define RXPROC_EN 0x20          /* receive processor enable */
+#define TRIG_NO   0x00          /* Rx FIFO trigger level 0 (no trigger) */
+#define TRIG_1    0x08          /* trigger level 1 char */
+#define TRIG_1_2  0x10          /* trigger level 1/2 */
+#define TRIG_7_8  0x18          /* trigger level 7/8 */
+#define TRIG_MASK 0x18          /* trigger level mask */
+#define SRCINT_EN 0x04          /* special Rx condition interrupt enable */
+#define RXINT_EN  0x02          /* Rx interrupt enable */
+#define MCINT_EN  0x01          /* modem change interrupt enable */
+
+#define RXF_TRIG  0x20          /* Rx FIFO trigger level interrupt */
+#define TXFIFO_MT 0x10          /* Tx FIFO empty interrupt */
+#define SRC_INT   0x08          /* special receive condition interrupt */
+#define DELTA_CD  0x04          /* CD change interrupt */
+#define DELTA_CTS 0x02          /* CTS change interrupt */
+#define DELTA_DSR 0x01          /* DSR change interrupt */
+
+#define REP1W2_EN 0x10          /* replace byte 1 with 2 bytes enable */
+#define IGN2_EN   0x08          /* ignore byte 2 enable */
+#define IGN1_EN   0x04          /* ignore byte 1 enable */
+#define COMP2_EN  0x02          /* compare byte 2 enable */
+#define COMP1_EN  0x01          /* compare byte 1 enable */
+
+#define RESET_ALL 0x80          /* reset AIOP (all channels) */
+#define TXOVERIDE 0x40          /* Transmit software off override */
+#define RESETUART 0x20          /* reset channel's UART */
+#define RESTXFCNT 0x10          /* reset channel's Tx FIFO count register */
+#define RESRXFCNT 0x08          /* reset channel's Rx FIFO count register */
+
+#define INTSTAT0  0x01          /* AIOP 0 interrupt status */
+#define INTSTAT1  0x02          /* AIOP 1 interrupt status */
+#define INTSTAT2  0x04          /* AIOP 2 interrupt status */
+#define INTSTAT3  0x08          /* AIOP 3 interrupt status */
+
+#define INTR_EN   0x08          /* allow interrupts to host */
+#define INT_STROB 0x04          /* strobe and clear interrupt line (EOI) */
+
+/**************************************************************************
+ MUDBAC remapped for PCI
+**************************************************************************/
+
+#define _CFG_INT_PCI  0x40
+#define _PCI_INT_FUNC 0x3A
+
+#define PCI_STROB 0x2000        /* bit 13 of int aiop register */
+#define INTR_EN_PCI   0x0010    /* allow interrupts to host */
+
+/*
+ * Definitions for Universal PCI board registers
+ */
+#define _PCI_9030_INT_CTRL      0x4c          /* Offsets from BAR1 */
+#define _PCI_9030_GPIO_CTRL     0x54
+#define PCI_INT_CTRL_AIOP       0x0001
+#define PCI_GPIO_CTRL_8PORT     0x4000
+#define _PCI_9030_RING_IND      0xc0          /* Offsets from BAR1 */
+
+#define CHAN3_EN  0x08          /* enable AIOP 3 */
+#define CHAN2_EN  0x04          /* enable AIOP 2 */
+#define CHAN1_EN  0x02          /* enable AIOP 1 */
+#define CHAN0_EN  0x01          /* enable AIOP 0 */
+#define FREQ_DIS  0x00
+#define FREQ_274HZ 0x60
+#define FREQ_137HZ 0x50
+#define FREQ_69HZ  0x40
+#define FREQ_34HZ  0x30
+#define FREQ_17HZ  0x20
+#define FREQ_9HZ   0x10
+#define PERIODIC_ONLY 0x80      /* only PERIODIC interrupt */
+
+#define CHANINT_EN 0x0100       /* flags to enable/disable channel ints */
+
+#define RDATASIZE 72
+#define RREGDATASIZE 52
+
+/*
+ * AIOP interrupt bits for ISA/PCI boards and UPCI boards.
+ */
+#define AIOP_INTR_BIT_0         0x0001
+#define AIOP_INTR_BIT_1         0x0002
+#define AIOP_INTR_BIT_2         0x0004
+#define AIOP_INTR_BIT_3         0x0008
+
+#define AIOP_INTR_BITS ( \
+        AIOP_INTR_BIT_0 \
+        | AIOP_INTR_BIT_1 \
+        | AIOP_INTR_BIT_2 \
+        | AIOP_INTR_BIT_3)
+
+#define UPCI_AIOP_INTR_BIT_0    0x0004
+#define UPCI_AIOP_INTR_BIT_1    0x0020
+#define UPCI_AIOP_INTR_BIT_2    0x0100
+#define UPCI_AIOP_INTR_BIT_3    0x0800
+
+#define UPCI_AIOP_INTR_BITS ( \
+        UPCI_AIOP_INTR_BIT_0 \
+        | UPCI_AIOP_INTR_BIT_1 \
+        | UPCI_AIOP_INTR_BIT_2 \
+        | UPCI_AIOP_INTR_BIT_3)
+
+/* Controller level information structure */
+typedef struct {
+        int CtlID;
+        int CtlNum;
+        int BusType;
+        int boardType;
+        int isUPCI;
+        WordIO_t PCIIO;
+        WordIO_t PCIIO2;
+        ByteIO_t MBaseIO;
+        ByteIO_t MReg1IO;
+        ByteIO_t MReg2IO;
+        ByteIO_t MReg3IO;
+        Byte_t MReg2;
+        Byte_t MReg3;
+        int NumAiop;
+        int AltChanRingIndicator;
+        ByteIO_t UPCIRingInd;
+        WordIO_t AiopIO[AIOP_CTL_SIZE];
+        ByteIO_t AiopIntChanIO[AIOP_CTL_SIZE];
+        int AiopID[AIOP_CTL_SIZE];
+        int AiopNumChan[AIOP_CTL_SIZE];
+        Word_t *AiopIntrBits;
+} CONTROLLER_T;
+
+typedef CONTROLLER_T CONTROLLER_t;
+
+/* Channel level information structure */
+typedef struct {
+        CONTROLLER_T *CtlP;
+        int AiopNum;
+        int ChanID;
+        int ChanNum;
+        int rtsToggle;
+
+        ByteIO_t Cmd;
+        ByteIO_t IntChan;
+        ByteIO_t IntMask;
+        DWordIO_t IndexAddr;
+        WordIO_t IndexData;
+
+        WordIO_t TxRxData;
+        WordIO_t ChanStat;
+        WordIO_t TxRxCount;
+        ByteIO_t IntID;
+
+        Word_t TxFIFO;
+        Word_t TxFIFOPtrs;
+        Word_t RxFIFO;
+        Word_t RxFIFOPtrs;
+        Word_t TxPrioCnt;
+        Word_t TxPrioPtr;
+        Word_t TxPrioBuf;
+
+        Byte_t R[RREGDATASIZE];
+
+        Byte_t BaudDiv[4];
+        Byte_t TxControl[4];
+        Byte_t RxControl[4];
+        Byte_t TxEnables[4];
+        Byte_t TxCompare[4];
+        Byte_t TxReplace1[4];
+        Byte_t TxReplace2[4];
+} CHANNEL_T;
+
+typedef CHANNEL_T CHANNEL_t;
+typedef CHANNEL_T *CHANPTR_T;
+
+#define InterfaceModeRS232  0x00
+#define InterfaceModeRS422  0x08
+#define InterfaceModeRS485  0x10
+#define InterfaceModeRS232T 0x18
+
+/***************************************************************************
+Function: sClrBreak
+Purpose:  Stop sending a transmit BREAK signal
+Call:     sClrBreak(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sClrBreak(ChP) \
+do { \
+   (ChP)->TxControl[3] &= ~SETBREAK; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sClrDTR
+Purpose:  Clr the DTR output
+Call:     sClrDTR(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sClrDTR(ChP) \
+do { \
+   (ChP)->TxControl[3] &= ~SET_DTR; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sClrRTS
+Purpose:  Clr the RTS output
+Call:     sClrRTS(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sClrRTS(ChP) \
+do { \
+   if ((ChP)->rtsToggle) break; \
+   (ChP)->TxControl[3] &= ~SET_RTS; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sClrTxXOFF
+Purpose:  Clear any existing transmit software flow control off condition
+Call:     sClrTxXOFF(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sClrTxXOFF(ChP) \
+do { \
+   sOutB((ChP)->Cmd,TXOVERIDE | (Byte_t)(ChP)->ChanNum); \
+   sOutB((ChP)->Cmd,(Byte_t)(ChP)->ChanNum); \
+} while (0)
+
+/***************************************************************************
+Function: sCtlNumToCtlPtr
+Purpose:  Convert a controller number to controller structure pointer
+Call:     sCtlNumToCtlPtr(CtlNum)
+          int CtlNum; Controller number
+Return:   CONTROLLER_T *: Ptr to controller structure
+*/
+#define sCtlNumToCtlPtr(CTLNUM) &sController[CTLNUM]
+
+/***************************************************************************
+Function: sControllerEOI
+Purpose:  Strobe the MUDBAC's End Of Interrupt bit.
+Call:     sControllerEOI(CtlP)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+*/
+#define sControllerEOI(CTLP) sOutB((CTLP)->MReg2IO,(CTLP)->MReg2 | INT_STROB)
+
+/***************************************************************************
+Function: sPCIControllerEOI
+Purpose:  Strobe the PCI End Of Interrupt bit.
+          For the UPCI boards, toggle the AIOP interrupt enable bit
+          (this was taken from the Windows driver).
+Call:     sPCIControllerEOI(CtlP)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+*/
+#define sPCIControllerEOI(CTLP) \
+do { \
+    if ((CTLP)->isUPCI) { \
+        Word_t w = sInW((CTLP)->PCIIO); \
+        sOutW((CTLP)->PCIIO, (w ^ PCI_INT_CTRL_AIOP)); \
+        sOutW((CTLP)->PCIIO, w); \
+    } \
+    else { \
+        sOutW((CTLP)->PCIIO, PCI_STROB); \
+    } \
+} while (0)
+
+/***************************************************************************
+Function: sDisAiop
+Purpose:  Disable I/O access to an AIOP
+Call:     sDisAiop(CltP)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+          int AiopNum; Number of AIOP on controller
+*/
+#define sDisAiop(CTLP,AIOPNUM) \
+do { \
+   (CTLP)->MReg3 &= sBitMapClrTbl[AIOPNUM]; \
+   sOutB((CTLP)->MReg3IO,(CTLP)->MReg3); \
+} while (0)
+
+/***************************************************************************
+Function: sDisCTSFlowCtl
+Purpose:  Disable output flow control using CTS
+Call:     sDisCTSFlowCtl(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sDisCTSFlowCtl(ChP) \
+do { \
+   (ChP)->TxControl[2] &= ~CTSFC_EN; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sDisIXANY
+Purpose:  Disable IXANY Software Flow Control
+Call:     sDisIXANY(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sDisIXANY(ChP) \
+do { \
+   (ChP)->R[0x0e] = 0x86; \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x0c]); \
+} while (0)
+
+/***************************************************************************
+Function: DisParity
+Purpose:  Disable parity
+Call:     sDisParity(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: Function sSetParity() can be used in place of functions sEnParity(),
+          sDisParity(), sSetOddParity(), and sSetEvenParity().
+*/
+#define sDisParity(ChP) \
+do { \
+   (ChP)->TxControl[2] &= ~PARITY_EN; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sDisRTSToggle
+Purpose:  Disable RTS toggle
+Call:     sDisRTSToggle(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sDisRTSToggle(ChP) \
+do { \
+   (ChP)->TxControl[2] &= ~RTSTOG_EN; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+   (ChP)->rtsToggle = 0; \
+} while (0)
+
+/***************************************************************************
+Function: sDisRxFIFO
+Purpose:  Disable Rx FIFO
+Call:     sDisRxFIFO(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sDisRxFIFO(ChP) \
+do { \
+   (ChP)->R[0x32] = 0x0a; \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x30]); \
+} while (0)
+
+/***************************************************************************
+Function: sDisRxStatusMode
+Purpose:  Disable the Rx status mode
+Call:     sDisRxStatusMode(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: This takes the channel out of the receive status mode.  All
+          subsequent reads of receive data using sReadRxWord() will return
+          two data bytes.
+*/
+#define sDisRxStatusMode(ChP) sOutW((ChP)->ChanStat,0)
+
+/***************************************************************************
+Function: sDisTransmit
+Purpose:  Disable transmit
+Call:     sDisTransmit(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+          This disables movement of Tx data from the Tx FIFO into the 1 byte
+          Tx buffer.  Therefore there could be up to a 2 byte latency
+          between the time sDisTransmit() is called and the transmit buffer
+          and transmit shift register going completely empty.
+*/
+#define sDisTransmit(ChP) \
+do { \
+   (ChP)->TxControl[3] &= ~TX_ENABLE; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sDisTxSoftFlowCtl
+Purpose:  Disable Tx Software Flow Control
+Call:     sDisTxSoftFlowCtl(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sDisTxSoftFlowCtl(ChP) \
+do { \
+   (ChP)->R[0x06] = 0x8a; \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x04]); \
+} while (0)
+
+/***************************************************************************
+Function: sEnAiop
+Purpose:  Enable I/O access to an AIOP
+Call:     sEnAiop(CltP)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+          int AiopNum; Number of AIOP on controller
+*/
+#define sEnAiop(CTLP,AIOPNUM) \
+do { \
+   (CTLP)->MReg3 |= sBitMapSetTbl[AIOPNUM]; \
+   sOutB((CTLP)->MReg3IO,(CTLP)->MReg3); \
+} while (0)
+
+/***************************************************************************
+Function: sEnCTSFlowCtl
+Purpose:  Enable output flow control using CTS
+Call:     sEnCTSFlowCtl(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sEnCTSFlowCtl(ChP) \
+do { \
+   (ChP)->TxControl[2] |= CTSFC_EN; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sEnIXANY
+Purpose:  Enable IXANY Software Flow Control
+Call:     sEnIXANY(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sEnIXANY(ChP) \
+do { \
+   (ChP)->R[0x0e] = 0x21; \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x0c]); \
+} while (0)
+
+/***************************************************************************
+Function: EnParity
+Purpose:  Enable parity
+Call:     sEnParity(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: Function sSetParity() can be used in place of functions sEnParity(),
+          sDisParity(), sSetOddParity(), and sSetEvenParity().
+
+Warnings: Before enabling parity odd or even parity should be chosen using
+          functions sSetOddParity() or sSetEvenParity().
+*/
+#define sEnParity(ChP) \
+do { \
+   (ChP)->TxControl[2] |= PARITY_EN; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sEnRTSToggle
+Purpose:  Enable RTS toggle
+Call:     sEnRTSToggle(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: This function will disable RTS flow control and clear the RTS
+          line to allow operation of RTS toggle.
+*/
+#define sEnRTSToggle(ChP) \
+do { \
+   (ChP)->RxControl[2] &= ~RTSFC_EN; \
+   out32((ChP)->IndexAddr,(ChP)->RxControl); \
+   (ChP)->TxControl[2] |= RTSTOG_EN; \
+   (ChP)->TxControl[3] &= ~SET_RTS; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+   (ChP)->rtsToggle = 1; \
+} while (0)
+
+/***************************************************************************
+Function: sEnRxFIFO
+Purpose:  Enable Rx FIFO
+Call:     sEnRxFIFO(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sEnRxFIFO(ChP) \
+do { \
+   (ChP)->R[0x32] = 0x08; \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x30]); \
+} while (0)
+
+/***************************************************************************
+Function: sEnRxProcessor
+Purpose:  Enable the receive processor
+Call:     sEnRxProcessor(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: This function is used to start the receive processor.  When
+          the channel is in the reset state the receive processor is not
+          running.  This is done to prevent the receive processor from
+          executing invalid microcode instructions prior to the
+          downloading of the microcode.
+
+Warnings: This function must be called after valid microcode has been
+          downloaded to the AIOP, and it must not be called before the
+          microcode has been downloaded.
+*/
+#define sEnRxProcessor(ChP) \
+do { \
+   (ChP)->RxControl[2] |= RXPROC_EN; \
+   out32((ChP)->IndexAddr,(ChP)->RxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sEnRxStatusMode
+Purpose:  Enable the Rx status mode
+Call:     sEnRxStatusMode(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: This places the channel in the receive status mode.  All subsequent
+          reads of receive data using sReadRxWord() will return a data byte
+          in the low word and a status byte in the high word.
+
+*/
+#define sEnRxStatusMode(ChP) sOutW((ChP)->ChanStat,STATMODE)
+
+/***************************************************************************
+Function: sEnTransmit
+Purpose:  Enable transmit
+Call:     sEnTransmit(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sEnTransmit(ChP) \
+do { \
+   (ChP)->TxControl[3] |= TX_ENABLE; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sEnTxSoftFlowCtl
+Purpose:  Enable Tx Software Flow Control
+Call:     sEnTxSoftFlowCtl(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sEnTxSoftFlowCtl(ChP) \
+do { \
+   (ChP)->R[0x06] = 0xc5; \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x04]); \
+} while (0)
+
+/***************************************************************************
+Function: sGetAiopIntStatus
+Purpose:  Get the AIOP interrupt status
+Call:     sGetAiopIntStatus(CtlP,AiopNum)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+          int AiopNum; AIOP number
+Return:   Byte_t: The AIOP interrupt status.  Bits 0 through 7
+                         represent channels 0 through 7 respectively.  If a
+                         bit is set that channel is interrupting.
+*/
+#define sGetAiopIntStatus(CTLP,AIOPNUM) sInB((CTLP)->AiopIntChanIO[AIOPNUM])
+
+/***************************************************************************
+Function: sGetAiopNumChan
+Purpose:  Get the number of channels supported by an AIOP
+Call:     sGetAiopNumChan(CtlP,AiopNum)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+          int AiopNum; AIOP number
+Return:   int: The number of channels supported by the AIOP
+*/
+#define sGetAiopNumChan(CTLP,AIOPNUM) (CTLP)->AiopNumChan[AIOPNUM]
+
+/***************************************************************************
+Function: sGetChanIntID
+Purpose:  Get a channel's interrupt identification byte
+Call:     sGetChanIntID(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   Byte_t: The channel interrupt ID.  Can be any
+             combination of the following flags:
+                RXF_TRIG:     Rx FIFO trigger level interrupt
+                TXFIFO_MT:    Tx FIFO empty interrupt
+                SRC_INT:      Special receive condition interrupt
+                DELTA_CD:     CD change interrupt
+                DELTA_CTS:    CTS change interrupt
+                DELTA_DSR:    DSR change interrupt
+*/
+#define sGetChanIntID(ChP) (sInB((ChP)->IntID) & (RXF_TRIG | TXFIFO_MT | SRC_INT | DELTA_CD | DELTA_CTS | DELTA_DSR))
+
+/***************************************************************************
+Function: sGetChanNum
+Purpose:  Get the number of a channel within an AIOP
+Call:     sGetChanNum(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   int: Channel number within AIOP, or NULLCHAN if channel does
+               not exist.
+*/
+#define sGetChanNum(ChP) (ChP)->ChanNum
+
+/***************************************************************************
+Function: sGetChanStatus
+Purpose:  Get the channel status
+Call:     sGetChanStatus(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   Word_t: The channel status.  Can be any combination of
+             the following flags:
+                LOW BYTE FLAGS
+                CTS_ACT:      CTS input asserted
+                DSR_ACT:      DSR input asserted
+                CD_ACT:       CD input asserted
+                TXFIFOMT:     Tx FIFO is empty
+                TXSHRMT:      Tx shift register is empty
+                RDA:          Rx data available
+
+                HIGH BYTE FLAGS
+                STATMODE:     status mode enable bit
+                RXFOVERFL:    receive FIFO overflow
+                RX2MATCH:     receive compare byte 2 match
+                RX1MATCH:     receive compare byte 1 match
+                RXBREAK:      received BREAK
+                RXFRAME:      received framing error
+                RXPARITY:     received parity error
+Warnings: This function will clear the high byte flags in the Channel
+          Status Register.
+*/
+#define sGetChanStatus(ChP) sInW((ChP)->ChanStat)
+
+/***************************************************************************
+Function: sGetChanStatusLo
+Purpose:  Get the low byte only of the channel status
+Call:     sGetChanStatusLo(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   Byte_t: The channel status low byte.  Can be any combination
+             of the following flags:
+                CTS_ACT:      CTS input asserted
+                DSR_ACT:      DSR input asserted
+                CD_ACT:       CD input asserted
+                TXFIFOMT:     Tx FIFO is empty
+                TXSHRMT:      Tx shift register is empty
+                RDA:          Rx data available
+*/
+#define sGetChanStatusLo(ChP) sInB((ByteIO_t)(ChP)->ChanStat)
+
+/**********************************************************************
+ * Get RI status of channel
+ * Defined as a function in rocket.c   -aes
+ */
+#if 0
+#define sGetChanRI(ChP) ((ChP)->CtlP->AltChanRingIndicator ? \
+                          (sInB((ByteIO_t)((ChP)->ChanStat+8)) & DSR_ACT) : \
+                            (((ChP)->CtlP->boardType == ROCKET_TYPE_PC104) ? \
+                               (!(sInB((ChP)->CtlP->AiopIO[3]) & sBitMapSetTbl[(ChP)->ChanNum])) : \
+                             0))
+#endif
+
+/***************************************************************************
+Function: sGetControllerIntStatus
+Purpose:  Get the controller interrupt status
+Call:     sGetControllerIntStatus(CtlP)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+Return:   Byte_t: The controller interrupt status in the lower 4
+                         bits.  Bits 0 through 3 represent AIOP's 0
+                         through 3 respectively.  If a bit is set that
+                         AIOP is interrupting.  Bits 4 through 7 will
+                         always be cleared.
+*/
+#define sGetControllerIntStatus(CTLP) (sInB((CTLP)->MReg1IO) & 0x0f)
+
+/***************************************************************************
+Function: sPCIGetControllerIntStatus
+Purpose:  Get the controller interrupt status
+Call:     sPCIGetControllerIntStatus(CtlP)
+          CONTROLLER_T *CtlP; Ptr to controller structure
+Return:   unsigned char: The controller interrupt status in the lower 4
+                         bits and bit 4.  Bits 0 through 3 represent AIOP's 0
+                         through 3 respectively. Bit 4 is set if the int 
+                         was generated from periodic. If a bit is set the
+                         AIOP is interrupting.
+*/
+#define sPCIGetControllerIntStatus(CTLP) \
+        ((CTLP)->isUPCI ? \
+          (sInW((CTLP)->PCIIO2) & UPCI_AIOP_INTR_BITS) : \
+          ((sInW((CTLP)->PCIIO) >> 8) & AIOP_INTR_BITS))
+
+/***************************************************************************
+
+Function: sGetRxCnt
+Purpose:  Get the number of data bytes in the Rx FIFO
+Call:     sGetRxCnt(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   int: The number of data bytes in the Rx FIFO.
+Comments: Byte read of count register is required to obtain Rx count.
+
+*/
+#define sGetRxCnt(ChP) sInW((ChP)->TxRxCount)
+
+/***************************************************************************
+Function: sGetTxCnt
+Purpose:  Get the number of data bytes in the Tx FIFO
+Call:     sGetTxCnt(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   Byte_t: The number of data bytes in the Tx FIFO.
+Comments: Byte read of count register is required to obtain Tx count.
+
+*/
+#define sGetTxCnt(ChP) sInB((ByteIO_t)(ChP)->TxRxCount)
+
+/*****************************************************************************
+Function: sGetTxRxDataIO
+Purpose:  Get the I/O address of a channel's TxRx Data register
+Call:     sGetTxRxDataIO(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Return:   WordIO_t: I/O address of a channel's TxRx Data register
+*/
+#define sGetTxRxDataIO(ChP) (ChP)->TxRxData
+
+/***************************************************************************
+Function: sInitChanDefaults
+Purpose:  Initialize a channel structure to it's default state.
+Call:     sInitChanDefaults(ChP)
+          CHANNEL_T *ChP; Ptr to the channel structure
+Comments: This function must be called once for every channel structure
+          that exists before any other SSCI calls can be made.
+
+*/
+#define sInitChanDefaults(ChP) \
+do { \
+   (ChP)->CtlP = NULLCTLPTR; \
+   (ChP)->AiopNum = NULLAIOP; \
+   (ChP)->ChanID = AIOPID_NULL; \
+   (ChP)->ChanNum = NULLCHAN; \
+} while (0)
+
+/***************************************************************************
+Function: sResetAiopByNum
+Purpose:  Reset the AIOP by number
+Call:     sResetAiopByNum(CTLP,AIOPNUM)
+        CONTROLLER_T CTLP; Ptr to controller structure
+        AIOPNUM; AIOP index 
+*/
+#define sResetAiopByNum(CTLP,AIOPNUM) \
+do { \
+   sOutB((CTLP)->AiopIO[(AIOPNUM)]+_CMD_REG,RESET_ALL); \
+   sOutB((CTLP)->AiopIO[(AIOPNUM)]+_CMD_REG,0x0); \
+} while (0)
+
+/***************************************************************************
+Function: sSendBreak
+Purpose:  Send a transmit BREAK signal
+Call:     sSendBreak(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sSendBreak(ChP) \
+do { \
+   (ChP)->TxControl[3] |= SETBREAK; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetBaud
+Purpose:  Set baud rate
+Call:     sSetBaud(ChP,Divisor)
+          CHANNEL_T *ChP; Ptr to channel structure
+          Word_t Divisor; 16 bit baud rate divisor for channel
+*/
+#define sSetBaud(ChP,DIVISOR) \
+do { \
+   (ChP)->BaudDiv[2] = (Byte_t)(DIVISOR); \
+   (ChP)->BaudDiv[3] = (Byte_t)((DIVISOR) >> 8); \
+   out32((ChP)->IndexAddr,(ChP)->BaudDiv); \
+} while (0)
+
+/***************************************************************************
+Function: sSetData7
+Purpose:  Set data bits to 7
+Call:     sSetData7(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sSetData7(ChP) \
+do { \
+   (ChP)->TxControl[2] &= ~DATA8BIT; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetData8
+Purpose:  Set data bits to 8
+Call:     sSetData8(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sSetData8(ChP) \
+do { \
+   (ChP)->TxControl[2] |= DATA8BIT; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetDTR
+Purpose:  Set the DTR output
+Call:     sSetDTR(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sSetDTR(ChP) \
+do { \
+   (ChP)->TxControl[3] |= SET_DTR; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetEvenParity
+Purpose:  Set even parity
+Call:     sSetEvenParity(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: Function sSetParity() can be used in place of functions sEnParity(),
+          sDisParity(), sSetOddParity(), and sSetEvenParity().
+
+Warnings: This function has no effect unless parity is enabled with function
+          sEnParity().
+*/
+#define sSetEvenParity(ChP) \
+do { \
+   (ChP)->TxControl[2] |= EVEN_PAR; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetOddParity
+Purpose:  Set odd parity
+Call:     sSetOddParity(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: Function sSetParity() can be used in place of functions sEnParity(),
+          sDisParity(), sSetOddParity(), and sSetEvenParity().
+
+Warnings: This function has no effect unless parity is enabled with function
+          sEnParity().
+*/
+#define sSetOddParity(ChP) \
+do { \
+   (ChP)->TxControl[2] &= ~EVEN_PAR; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetRTS
+Purpose:  Set the RTS output
+Call:     sSetRTS(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sSetRTS(ChP) \
+do { \
+   if ((ChP)->rtsToggle) break; \
+   (ChP)->TxControl[3] |= SET_RTS; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetRxTrigger
+Purpose:  Set the Rx FIFO trigger level
+Call:     sSetRxProcessor(ChP,Level)
+          CHANNEL_T *ChP; Ptr to channel structure
+          Byte_t Level; Number of characters in Rx FIFO at which the
+             interrupt will be generated.  Can be any of the following flags:
+
+             TRIG_NO:   no trigger
+             TRIG_1:    1 character in FIFO
+             TRIG_1_2:  FIFO 1/2 full
+             TRIG_7_8:  FIFO 7/8 full
+Comments: An interrupt will be generated when the trigger level is reached
+          only if function sEnInterrupt() has been called with flag
+          RXINT_EN set.  The RXF_TRIG flag in the Interrupt Idenfification
+          register will be set whenever the trigger level is reached
+          regardless of the setting of RXINT_EN.
+
+*/
+#define sSetRxTrigger(ChP,LEVEL) \
+do { \
+   (ChP)->RxControl[2] &= ~TRIG_MASK; \
+   (ChP)->RxControl[2] |= LEVEL; \
+   out32((ChP)->IndexAddr,(ChP)->RxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetStop1
+Purpose:  Set stop bits to 1
+Call:     sSetStop1(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sSetStop1(ChP) \
+do { \
+   (ChP)->TxControl[2] &= ~STOP2; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetStop2
+Purpose:  Set stop bits to 2
+Call:     sSetStop2(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+*/
+#define sSetStop2(ChP) \
+do { \
+   (ChP)->TxControl[2] |= STOP2; \
+   out32((ChP)->IndexAddr,(ChP)->TxControl); \
+} while (0)
+
+/***************************************************************************
+Function: sSetTxXOFFChar
+Purpose:  Set the Tx XOFF flow control character
+Call:     sSetTxXOFFChar(ChP,Ch)
+          CHANNEL_T *ChP; Ptr to channel structure
+          Byte_t Ch; The value to set the Tx XOFF character to
+*/
+#define sSetTxXOFFChar(ChP,CH) \
+do { \
+   (ChP)->R[0x07] = (CH); \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x04]); \
+} while (0)
+
+/***************************************************************************
+Function: sSetTxXONChar
+Purpose:  Set the Tx XON flow control character
+Call:     sSetTxXONChar(ChP,Ch)
+          CHANNEL_T *ChP; Ptr to channel structure
+          Byte_t Ch; The value to set the Tx XON character to
+*/
+#define sSetTxXONChar(ChP,CH) \
+do { \
+   (ChP)->R[0x0b] = (CH); \
+   out32((ChP)->IndexAddr,&(ChP)->R[0x08]); \
+} while (0)
+
+/***************************************************************************
+Function: sStartRxProcessor
+Purpose:  Start a channel's receive processor
+Call:     sStartRxProcessor(ChP)
+          CHANNEL_T *ChP; Ptr to channel structure
+Comments: This function is used to start a Rx processor after it was
+          stopped with sStopRxProcessor() or sStopSWInFlowCtl().  It
+          will restart both the Rx processor and software input flow control.
+
+*/
+#define sStartRxProcessor(ChP) out32((ChP)->IndexAddr,&(ChP)->R[0])
+
+/***************************************************************************
+Function: sWriteTxByte
+Purpose:  Write a transmit data byte to a channel.
+          ByteIO_t io: Channel transmit register I/O address.  This can
+                           be obtained with sGetTxRxDataIO().
+          Byte_t Data; The transmit data byte.
+Warnings: This function writes the data byte without checking to see if
+          sMaxTxSize is exceeded in the Tx FIFO.
+*/
+#define sWriteTxByte(IO,DATA) sOutB(IO,DATA)
+
+/*
+ * Begin Linux specific definitions for the Rocketport driver
+ *
+ * This code is Copyright Theodore Ts'o, 1995-1997
+ */
+
+struct r_port {
+        int magic;
+        struct tty_port port;
+        int line;
+        int flags;              /* Don't yet match the ASY_ flags!! */
+        unsigned int board:3;
+        unsigned int aiop:2;
+        unsigned int chan:3;
+        CONTROLLER_t *ctlp;
+        CHANNEL_t channel;
+        int intmask;
+        int xmit_fifo_room;     /* room in xmit fifo */
+        unsigned char *xmit_buf;
+        int xmit_head;
+        int xmit_tail;
+        int xmit_cnt;
+        int cd_status;
+        int ignore_status_mask;
+        int read_status_mask;
+        int cps;
+
+        struct completion close_wait;   /* Not yet matching the core */
+        spinlock_t slock;
+        struct mutex write_mtx;
+};
+
+#define RPORT_MAGIC 0x525001
+
+#define NUM_BOARDS 8
+#define MAX_RP_PORTS (32*NUM_BOARDS)
+
+/*
+ * The size of the xmit buffer is 1 page, or 4096 bytes
+ */
+#define XMIT_BUF_SIZE 4096
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/*
+ * Assigned major numbers for the Comtrol Rocketport
+ */
+#define TTY_ROCKET_MAJOR        46
+#define CUA_ROCKET_MAJOR        47
+
+#ifdef PCI_VENDOR_ID_RP
+#undef PCI_VENDOR_ID_RP
+#undef PCI_DEVICE_ID_RP8OCTA
+#undef PCI_DEVICE_ID_RP8INTF
+#undef PCI_DEVICE_ID_RP16INTF
+#undef PCI_DEVICE_ID_RP32INTF
+#undef PCI_DEVICE_ID_URP8OCTA
+#undef PCI_DEVICE_ID_URP8INTF
+#undef PCI_DEVICE_ID_URP16INTF
+#undef PCI_DEVICE_ID_CRP16INTF
+#undef PCI_DEVICE_ID_URP32INTF
+#endif
+
+/*  Comtrol PCI Vendor ID */
+#define PCI_VENDOR_ID_RP                0x11fe
+
+/*  Comtrol Device ID's */
+#define PCI_DEVICE_ID_RP32INTF          0x0001  /* Rocketport 32 port w/external I/F     */
+#define PCI_DEVICE_ID_RP8INTF           0x0002  /* Rocketport 8 port w/external I/F      */
+#define PCI_DEVICE_ID_RP16INTF          0x0003  /* Rocketport 16 port w/external I/F     */
+#define PCI_DEVICE_ID_RP4QUAD           0x0004  /* Rocketport 4 port w/quad cable        */
+#define PCI_DEVICE_ID_RP8OCTA           0x0005  /* Rocketport 8 port w/octa cable        */
+#define PCI_DEVICE_ID_RP8J              0x0006  /* Rocketport 8 port w/RJ11 connectors   */
+#define PCI_DEVICE_ID_RP4J              0x0007  /* Rocketport 4 port w/RJ11 connectors   */
+#define PCI_DEVICE_ID_RP8SNI            0x0008  /* Rocketport 8 port w/ DB78 SNI (Siemens) connector */
+#define PCI_DEVICE_ID_RP16SNI           0x0009  /* Rocketport 16 port w/ DB78 SNI (Siemens) connector   */
+#define PCI_DEVICE_ID_RPP4              0x000A  /* Rocketport Plus 4 port                */
+#define PCI_DEVICE_ID_RPP8              0x000B  /* Rocketport Plus 8 port                */
+#define PCI_DEVICE_ID_RP6M              0x000C  /* RocketModem 6 port                    */
+#define PCI_DEVICE_ID_RP4M              0x000D  /* RocketModem 4 port                    */
+#define PCI_DEVICE_ID_RP2_232           0x000E  /* Rocketport Plus 2 port RS232          */
+#define PCI_DEVICE_ID_RP2_422           0x000F  /* Rocketport Plus 2 port RS422          */ 
+
+/* Universal PCI boards  */
+#define PCI_DEVICE_ID_URP32INTF         0x0801  /* Rocketport UPCI 32 port w/external I/F */ 
+#define PCI_DEVICE_ID_URP8INTF          0x0802  /* Rocketport UPCI 8 port w/external I/F  */
+#define PCI_DEVICE_ID_URP16INTF         0x0803  /* Rocketport UPCI 16 port w/external I/F */
+#define PCI_DEVICE_ID_URP8OCTA          0x0805  /* Rocketport UPCI 8 port w/octa cable    */
+#define PCI_DEVICE_ID_UPCI_RM3_8PORT    0x080C  /* Rocketmodem III 8 port                 */
+#define PCI_DEVICE_ID_UPCI_RM3_4PORT    0x080D  /* Rocketmodem III 4 port                 */
+
+/* Compact PCI device */ 
+#define PCI_DEVICE_ID_CRP16INTF         0x0903  /* Rocketport Compact PCI 16 port w/external I/F */
+
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
new file mode 100644
index 000000000000..1b37626e8f13
--- /dev/null
+++ b/drivers/tty/serial/21285.c
@@ -0,0 +1,511 @@
+/*
+ * Driver for the serial port on the 21285 StrongArm-110 core logic chip.
+ *
+ * Based on drivers/char/serial.c
+ */
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/device.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+#include <asm/hardware/dec21285.h>
+#include <mach/hardware.h>
+
+#define BAUD_BASE               (mem_fclk_21285/64)
+
+#define SERIAL_21285_NAME       "ttyFB"
+#define SERIAL_21285_MAJOR      204
+#define SERIAL_21285_MINOR      4
+
+#define RXSTAT_DUMMY_READ       0x80000000
+#define RXSTAT_FRAME            (1 << 0)
+#define RXSTAT_PARITY           (1 << 1)
+#define RXSTAT_OVERRUN          (1 << 2)
+#define RXSTAT_ANYERR           (RXSTAT_FRAME|RXSTAT_PARITY|RXSTAT_OVERRUN)
+
+#define H_UBRLCR_BREAK          (1 << 0)
+#define H_UBRLCR_PARENB         (1 << 1)
+#define H_UBRLCR_PAREVN         (1 << 2)
+#define H_UBRLCR_STOPB          (1 << 3)
+#define H_UBRLCR_FIFO           (1 << 4)
+
+static const char serial21285_name[] = "Footbridge UART";
+
+#define tx_enabled(port)        ((port)->unused[0])
+#define rx_enabled(port)        ((port)->unused[1])
+
+/*
+ * The documented expression for selecting the divisor is:
+ *  BAUD_BASE / baud - 1
+ * However, typically BAUD_BASE is not divisible by baud, so
+ * we want to select the divisor that gives us the minimum
+ * error.  Therefore, we want:
+ *  int(BAUD_BASE / baud - 0.5) ->
+ *  int(BAUD_BASE / baud - (baud >> 1) / baud) ->
+ *  int((BAUD_BASE - (baud >> 1)) / baud)
+ */
+
+static void serial21285_stop_tx(struct uart_port *port)
+{
+        if (tx_enabled(port)) {
+                disable_irq_nosync(IRQ_CONTX);
+                tx_enabled(port) = 0;
+        }
+}
+
+static void serial21285_start_tx(struct uart_port *port)
+{
+        if (!tx_enabled(port)) {
+                enable_irq(IRQ_CONTX);
+                tx_enabled(port) = 1;
+        }
+}
+
+static void serial21285_stop_rx(struct uart_port *port)
+{
+        if (rx_enabled(port)) {
+                disable_irq_nosync(IRQ_CONRX);
+                rx_enabled(port) = 0;
+        }
+}
+
+static void serial21285_enable_ms(struct uart_port *port)
+{
+}
+
+static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned int status, ch, flag, rxs, max_count = 256;
+
+        status = *CSR_UARTFLG;
+        while (!(status & 0x10) && max_count--) {
+                ch = *CSR_UARTDR;
+                flag = TTY_NORMAL;
+                port->icount.rx++;
+
+                rxs = *CSR_RXSTAT | RXSTAT_DUMMY_READ;
+                if (unlikely(rxs & RXSTAT_ANYERR)) {
+                        if (rxs & RXSTAT_PARITY)
+                                port->icount.parity++;
+                        else if (rxs & RXSTAT_FRAME)
+                                port->icount.frame++;
+                        if (rxs & RXSTAT_OVERRUN)
+                                port->icount.overrun++;
+
+                        rxs &= port->read_status_mask;
+
+                        if (rxs & RXSTAT_PARITY)
+                                flag = TTY_PARITY;
+                        else if (rxs & RXSTAT_FRAME)
+                                flag = TTY_FRAME;
+                }
+
+                uart_insert_char(port, rxs, RXSTAT_OVERRUN, ch, flag);
+
+                status = *CSR_UARTFLG;
+        }
+        tty_flip_buffer_push(tty);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t serial21285_tx_chars(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct circ_buf *xmit = &port->state->xmit;
+        int count = 256;
+
+        if (port->x_char) {
+                *CSR_UARTDR = port->x_char;
+                port->icount.tx++;
+                port->x_char = 0;
+                goto out;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                serial21285_stop_tx(port);
+                goto out;
+        }
+
+        do {
+                *CSR_UARTDR = xmit->buf[xmit->tail];
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0 && !(*CSR_UARTFLG & 0x20));
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                serial21285_stop_tx(port);
+
+ out:
+        return IRQ_HANDLED;
+}
+
+static unsigned int serial21285_tx_empty(struct uart_port *port)
+{
+        return (*CSR_UARTFLG & 8) ? 0 : TIOCSER_TEMT;
+}
+
+/* no modem control lines */
+static unsigned int serial21285_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+static void serial21285_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static void serial21285_break_ctl(struct uart_port *port, int break_state)
+{
+        unsigned long flags;
+        unsigned int h_lcr;
+
+        spin_lock_irqsave(&port->lock, flags);
+        h_lcr = *CSR_H_UBRLCR;
+        if (break_state)
+                h_lcr |= H_UBRLCR_BREAK;
+        else
+                h_lcr &= ~H_UBRLCR_BREAK;
+        *CSR_H_UBRLCR = h_lcr;
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int serial21285_startup(struct uart_port *port)
+{
+        int ret;
+
+        tx_enabled(port) = 1;
+        rx_enabled(port) = 1;
+
+        ret = request_irq(IRQ_CONRX, serial21285_rx_chars, 0,
+                          serial21285_name, port);
+        if (ret == 0) {
+                ret = request_irq(IRQ_CONTX, serial21285_tx_chars, 0,
+                                  serial21285_name, port);
+                if (ret)
+                        free_irq(IRQ_CONRX, port);
+        }
+
+        return ret;
+}
+
+static void serial21285_shutdown(struct uart_port *port)
+{
+        free_irq(IRQ_CONTX, port);
+        free_irq(IRQ_CONRX, port);
+}
+
+static void
+serial21285_set_termios(struct uart_port *port, struct ktermios *termios,
+                        struct ktermios *old)
+{
+        unsigned long flags;
+        unsigned int baud, quot, h_lcr, b;
+
+        /*
+         * We don't support modem control lines.
+         */
+        termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
+        termios->c_cflag |= CLOCAL;
+
+        /*
+         * We don't support BREAK character recognition.
+         */
+        termios->c_iflag &= ~(IGNBRK | BRKINT);
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+        quot = uart_get_divisor(port, baud);
+        b = port->uartclk / (16 * quot);
+        tty_termios_encode_baud_rate(termios, b, b);
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                h_lcr = 0x00;
+                break;
+        case CS6:
+                h_lcr = 0x20;
+                break;
+        case CS7:
+                h_lcr = 0x40;
+                break;
+        default: /* CS8 */
+                h_lcr = 0x60;
+                break;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                h_lcr |= H_UBRLCR_STOPB;
+        if (termios->c_cflag & PARENB) {
+                h_lcr |= H_UBRLCR_PARENB;
+                if (!(termios->c_cflag & PARODD))
+                        h_lcr |= H_UBRLCR_PAREVN;
+        }
+
+        if (port->fifosize)
+                h_lcr |= H_UBRLCR_FIFO;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /*
+         * Which character status flags are we interested in?
+         */
+        port->read_status_mask = RXSTAT_OVERRUN;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY;
+
+        /*
+         * Which character status flags should we ignore?
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= RXSTAT_FRAME | RXSTAT_PARITY;
+        if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= RXSTAT_OVERRUN;
+
+        /*
+         * Ignore all characters if CREAD is not set.
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->ignore_status_mask |= RXSTAT_DUMMY_READ;
+
+        quot -= 1;
+
+        *CSR_UARTCON = 0;
+        *CSR_L_UBRLCR = quot & 0xff;
+        *CSR_M_UBRLCR = (quot >> 8) & 0x0f;
+        *CSR_H_UBRLCR = h_lcr;
+        *CSR_UARTCON = 1;
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *serial21285_type(struct uart_port *port)
+{
+        return port->type == PORT_21285 ? "DC21285" : NULL;
+}
+
+static void serial21285_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, 32);
+}
+
+static int serial21285_request_port(struct uart_port *port)
+{
+        return request_mem_region(port->mapbase, 32, serial21285_name)
+                         != NULL ? 0 : -EBUSY;
+}
+
+static void serial21285_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE && serial21285_request_port(port) == 0)
+                port->type = PORT_21285;
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int serial21285_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_21285)
+                ret = -EINVAL;
+        if (ser->irq != NO_IRQ)
+                ret = -EINVAL;
+        if (ser->baud_base != port->uartclk / 16)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops serial21285_ops = {
+        .tx_empty       = serial21285_tx_empty,
+        .get_mctrl      = serial21285_get_mctrl,
+        .set_mctrl      = serial21285_set_mctrl,
+        .stop_tx        = serial21285_stop_tx,
+        .start_tx       = serial21285_start_tx,
+        .stop_rx        = serial21285_stop_rx,
+        .enable_ms      = serial21285_enable_ms,
+        .break_ctl      = serial21285_break_ctl,
+        .startup        = serial21285_startup,
+        .shutdown       = serial21285_shutdown,
+        .set_termios    = serial21285_set_termios,
+        .type           = serial21285_type,
+        .release_port   = serial21285_release_port,
+        .request_port   = serial21285_request_port,
+        .config_port    = serial21285_config_port,
+        .verify_port    = serial21285_verify_port,
+};
+
+static struct uart_port serial21285_port = {
+        .mapbase        = 0x42000160,
+        .iotype         = UPIO_MEM,
+        .irq            = NO_IRQ,
+        .fifosize       = 16,
+        .ops            = &serial21285_ops,
+        .flags          = UPF_BOOT_AUTOCONF,
+};
+
+static void serial21285_setup_ports(void)
+{
+        serial21285_port.uartclk = mem_fclk_21285 / 4;
+}
+
+#ifdef CONFIG_SERIAL_21285_CONSOLE
+static void serial21285_console_putchar(struct uart_port *port, int ch)
+{
+        while (*CSR_UARTFLG & 0x20)
+                barrier();
+        *CSR_UARTDR = ch;
+}
+
+static void
+serial21285_console_write(struct console *co, const char *s,
+                          unsigned int count)
+{
+        uart_console_write(&serial21285_port, s, count, serial21285_console_putchar);
+}
+
+static void __init
+serial21285_get_options(struct uart_port *port, int *baud,
+                        int *parity, int *bits)
+{
+        if (*CSR_UARTCON == 1) {
+                unsigned int tmp;
+
+                tmp = *CSR_H_UBRLCR;
+                switch (tmp & 0x60) {
+                case 0x00:
+                        *bits = 5;
+                        break;
+                case 0x20:
+                        *bits = 6;
+                        break;
+                case 0x40:
+                        *bits = 7;
+                        break;
+                default:
+                case 0x60:
+                        *bits = 8;
+                        break;
+                }
+
+                if (tmp & H_UBRLCR_PARENB) {
+                        *parity = 'o';
+                        if (tmp & H_UBRLCR_PAREVN)
+                                *parity = 'e';
+                }
+
+                tmp = *CSR_L_UBRLCR | (*CSR_M_UBRLCR << 8);
+
+                *baud = port->uartclk / (16 * (tmp + 1));
+        }
+}
+
+static int __init serial21285_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port = &serial21285_port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (machine_is_personal_server())
+                baud = 57600;
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                serial21285_get_options(port, &baud, &parity, &bits);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver serial21285_reg;
+
+static struct console serial21285_console =
+{
+        .name           = SERIAL_21285_NAME,
+        .write          = serial21285_console_write,
+        .device         = uart_console_device,
+        .setup          = serial21285_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &serial21285_reg,
+};
+
+static int __init rs285_console_init(void)
+{
+        serial21285_setup_ports();
+        register_console(&serial21285_console);
+        return 0;
+}
+console_initcall(rs285_console_init);
+
+#define SERIAL_21285_CONSOLE    &serial21285_console
+#else
+#define SERIAL_21285_CONSOLE    NULL
+#endif
+
+static struct uart_driver serial21285_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "ttyFB",
+        .dev_name               = "ttyFB",
+        .major                  = SERIAL_21285_MAJOR,
+        .minor                  = SERIAL_21285_MINOR,
+        .nr                     = 1,
+        .cons                   = SERIAL_21285_CONSOLE,
+};
+
+static int __init serial21285_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: 21285 driver\n");
+
+        serial21285_setup_ports();
+
+        ret = uart_register_driver(&serial21285_reg);
+        if (ret == 0)
+                uart_add_one_port(&serial21285_reg, &serial21285_port);
+
+        return ret;
+}
+
+static void __exit serial21285_exit(void)
+{
+        uart_remove_one_port(&serial21285_reg, &serial21285_port);
+        uart_unregister_driver(&serial21285_reg);
+}
+
+module_init(serial21285_init);
+module_exit(serial21285_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Intel Footbridge (21285) serial driver");
+MODULE_ALIAS_CHARDEV(SERIAL_21285_MAJOR, SERIAL_21285_MINOR);
diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c
new file mode 100644
index 000000000000..e0a77540b8ca
--- /dev/null
+++ b/drivers/tty/serial/68328serial.c
@@ -0,0 +1,1448 @@
+/* 68328serial.c: Serial port driver for 68328 microcontroller
+ *
+ * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
+ * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
+ * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
+ * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
+ * Copyright (C) 2002-2003  David McCullough   <davidm@snapgear.com>
+ * Copyright (C) 2002       Greg Ungerer       <gerg@snapgear.com>
+ *
+ * VZ Support/Fixes             Evan Stawnyczy <e@lineo.ca>
+ * Multiple UART support        Daniel Potts <danielp@cse.unsw.edu.au>
+ * Power management support     Daniel Potts <danielp@cse.unsw.edu.au>
+ * VZ Second Serial Port enable Phil Wilshire
+ * 2.4/2.5 port                 David McCullough
+ */
+
+#include <asm/dbg.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/reboot.h>
+#include <linux/keyboard.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/delay.h>
+#include <asm/uaccess.h>
+
+/* (es) */
+/* note: perhaps we can murge these files, so that you can just
+ *       define 1 of them, and they can sort that out for themselves
+ */
+#if defined(CONFIG_M68EZ328)
+#include <asm/MC68EZ328.h>
+#else
+#if defined(CONFIG_M68VZ328)
+#include <asm/MC68VZ328.h>
+#else
+#include <asm/MC68328.h>
+#endif /* CONFIG_M68VZ328 */
+#endif /* CONFIG_M68EZ328 */
+
+#include "68328serial.h"
+
+/* Turn off usage of real serial interrupt code, to "support" Copilot */
+#ifdef CONFIG_XCOPILOT_BUGS
+#undef USE_INTS
+#else
+#define USE_INTS
+#endif
+
+static struct m68k_serial m68k_soft[NR_PORTS];
+
+static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
+
+/* multiple ports are contiguous in memory */
+m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
+
+struct tty_struct m68k_ttys;
+struct m68k_serial *m68k_consinfo = 0;
+
+#define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
+
+struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/* Debugging... DEBUG_INTR is bad to use when one of the zs
+ * lines is your console ;(
+ */
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+
+#define RS_ISR_PASS_LIMIT 256
+
+static void change_speed(struct m68k_serial *info);
+
+/*
+ *      Setup for console. Argument comes from the boot command line.
+ */
+
+/* note: this is messy, but it works, again, perhaps defined somewhere else?*/
+#ifdef CONFIG_M68VZ328
+#define CONSOLE_BAUD_RATE       19200
+#define DEFAULT_CBAUD           B19200
+#endif
+
+
+#ifndef CONSOLE_BAUD_RATE
+#define CONSOLE_BAUD_RATE       9600
+#define DEFAULT_CBAUD           B9600
+#endif
+
+
+static int m68328_console_initted = 0;
+static int m68328_console_baud    = CONSOLE_BAUD_RATE;
+static int m68328_console_cbaud   = DEFAULT_CBAUD;
+
+
+static inline int serial_paranoia_check(struct m68k_serial *info,
+                                        char *name, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+        static const char *badmagic =
+                "Warning: bad magic number for serial struct %s in %s\n";
+        static const char *badinfo =
+                "Warning: null m68k_serial for %s in %s\n";
+
+        if (!info) {
+                printk(badinfo, name, routine);
+                return 1;
+        }
+        if (info->magic != SERIAL_MAGIC) {
+                printk(badmagic, name, routine);
+                return 1;
+        }
+#endif
+        return 0;
+}
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts
+ */
+static int baud_table[] = {
+        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+        9600, 19200, 38400, 57600, 115200, 0 };
+
+/* Sets or clears DTR/RTS on the requested line */
+static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
+{
+        if (set) {
+                /* set the RTS/CTS line */
+        } else {
+                /* clear it */
+        }
+        return;
+}
+
+/* Utility routines */
+static inline int get_baud(struct m68k_serial *ss)
+{
+        unsigned long result = 115200;
+        unsigned short int baud = uart_addr[ss->line].ubaud;
+        if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
+        result >>= GET_FIELD(baud, UBAUD_DIVIDE);
+
+        return result;
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void rs_stop(struct tty_struct *tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_stop"))
+                return;
+        
+        local_irq_save(flags);
+        uart->ustcnt &= ~USTCNT_TXEN;
+        local_irq_restore(flags);
+}
+
+static int rs_put_char(char ch)
+{
+        int flags, loops = 0;
+
+        local_irq_save(flags);
+
+        while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
+                loops++;
+                udelay(5);
+        }
+
+        UTX_TXDATA = ch;
+        udelay(5);
+        local_irq_restore(flags);
+        return 1;
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+        
+        if (serial_paranoia_check(info, tty->name, "rs_start"))
+                return;
+        
+        local_irq_save(flags);
+        if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
+#ifdef USE_INTS
+                uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
+#else
+                uart->ustcnt |= USTCNT_TXEN;
+#endif
+        }
+        local_irq_restore(flags);
+}
+
+/* Drop into either the boot monitor or kadb upon receiving a break
+ * from keyboard/console input.
+ */
+static void batten_down_hatches(void)
+{
+        /* Drop into the debugger */
+}
+
+static void status_handle(struct m68k_serial *info, unsigned short status)
+{
+#if 0
+        if(status & DCD) {
+                if((info->port.tty->termios->c_cflag & CRTSCTS) &&
+                   ((info->curregs[3] & AUTO_ENAB)==0)) {
+                        info->curregs[3] |= AUTO_ENAB;
+                        info->pendregs[3] |= AUTO_ENAB;
+                        write_zsreg(info->m68k_channel, 3, info->curregs[3]);
+                }
+        } else {
+                if((info->curregs[3] & AUTO_ENAB)) {
+                        info->curregs[3] &= ~AUTO_ENAB;
+                        info->pendregs[3] &= ~AUTO_ENAB;
+                        write_zsreg(info->m68k_channel, 3, info->curregs[3]);
+                }
+        }
+#endif
+        /* If this is console input and this is a
+         * 'break asserted' status change interrupt
+         * see if we can drop into the debugger
+         */
+        if((status & URX_BREAK) && info->break_abort)
+                batten_down_hatches();
+        return;
+}
+
+static void receive_chars(struct m68k_serial *info, unsigned short rx)
+{
+        struct tty_struct *tty = info->tty;
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned char ch, flag;
+
+        /*
+         * This do { } while() loop will get ALL chars out of Rx FIFO 
+         */
+#ifndef CONFIG_XCOPILOT_BUGS
+        do {
+#endif  
+                ch = GET_FIELD(rx, URX_RXDATA);
+        
+                if(info->is_cons) {
+                        if(URX_BREAK & rx) { /* whee, break received */
+                                status_handle(info, rx);
+                                return;
+#ifdef CONFIG_MAGIC_SYSRQ
+                        } else if (ch == 0x10) { /* ^P */
+                                show_state();
+                                show_free_areas(0);
+                                show_buffers();
+/*                              show_net_buffers(); */
+                                return;
+                        } else if (ch == 0x12) { /* ^R */
+                                emergency_restart();
+                                return;
+#endif /* CONFIG_MAGIC_SYSRQ */
+                        }
+                }
+
+                if(!tty)
+                        goto clear_and_exit;
+                
+                flag = TTY_NORMAL;
+
+                if(rx & URX_PARITY_ERROR) {
+                        flag = TTY_PARITY;
+                        status_handle(info, rx);
+                } else if(rx & URX_OVRUN) {
+                        flag = TTY_OVERRUN;
+                        status_handle(info, rx);
+                } else if(rx & URX_FRAME_ERROR) {
+                        flag = TTY_FRAME;
+                        status_handle(info, rx);
+                }
+                tty_insert_flip_char(tty, ch, flag);
+#ifndef CONFIG_XCOPILOT_BUGS
+        } while((rx = uart->urx.w) & URX_DATA_READY);
+#endif
+
+        tty_schedule_flip(tty);
+
+clear_and_exit:
+        return;
+}
+
+static void transmit_chars(struct m68k_serial *info)
+{
+        m68328_uart *uart = &uart_addr[info->line];
+
+        if (info->x_char) {
+                /* Send next char */
+                uart->utx.b.txdata = info->x_char;
+                info->x_char = 0;
+                goto clear_and_return;
+        }
+
+        if((info->xmit_cnt <= 0) || info->tty->stopped) {
+                /* That's peculiar... TX ints off */
+                uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
+                goto clear_and_return;
+        }
+
+        /* Send char */
+        uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+        info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+        info->xmit_cnt--;
+
+        if (info->xmit_cnt < WAKEUP_CHARS)
+                schedule_work(&info->tqueue);
+
+        if(info->xmit_cnt <= 0) {
+                /* All done for now... TX ints off */
+                uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
+                goto clear_and_return;
+        }
+
+clear_and_return:
+        /* Clear interrupt (should be auto)*/
+        return;
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+irqreturn_t rs_interrupt(int irq, void *dev_id)
+{
+        struct m68k_serial *info = dev_id;
+        m68328_uart *uart;
+        unsigned short rx;
+        unsigned short tx;
+
+        uart = &uart_addr[info->line];
+        rx = uart->urx.w;
+
+#ifdef USE_INTS
+        tx = uart->utx.w;
+
+        if (rx & URX_DATA_READY) receive_chars(info, rx);
+        if (tx & UTX_TX_AVAIL)   transmit_chars(info);
+#else
+        receive_chars(info, rx);                
+#endif
+        return IRQ_HANDLED;
+}
+
+static void do_softint(struct work_struct *work)
+{
+        struct m68k_serial      *info = container_of(work, struct m68k_serial, tqueue);
+        struct tty_struct       *tty;
+        
+        tty = info->tty;
+        if (!tty)
+                return;
+#if 0
+        if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+                tty_wakeup(tty);
+        }
+#endif   
+}
+
+static int startup(struct m68k_serial * info)
+{
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+        
+        if (info->flags & S_INITIALIZED)
+                return 0;
+
+        if (!info->xmit_buf) {
+                info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
+                if (!info->xmit_buf)
+                        return -ENOMEM;
+        }
+
+        local_irq_save(flags);
+
+        /*
+         * Clear the FIFO buffers and disable them
+         * (they will be reenabled in change_speed())
+         */
+
+        uart->ustcnt = USTCNT_UEN;
+        info->xmit_fifo_size = 1;
+        uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
+        (void)uart->urx.w;
+
+        /*
+         * Finally, enable sequencing and interrupts
+         */
+#ifdef USE_INTS
+        uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | 
+                 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
+#else
+        uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
+#endif
+
+        if (info->tty)
+                clear_bit(TTY_IO_ERROR, &info->tty->flags);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+        /*
+         * and set the speed of the serial port
+         */
+
+        change_speed(info);
+
+        info->flags |= S_INITIALIZED;
+        local_irq_restore(flags);
+        return 0;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void shutdown(struct m68k_serial * info)
+{
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long   flags;
+
+        uart->ustcnt = 0; /* All off! */
+        if (!(info->flags & S_INITIALIZED))
+                return;
+
+        local_irq_save(flags);
+        
+        if (info->xmit_buf) {
+                free_page((unsigned long) info->xmit_buf);
+                info->xmit_buf = 0;
+        }
+
+        if (info->tty)
+                set_bit(TTY_IO_ERROR, &info->tty->flags);
+        
+        info->flags &= ~S_INITIALIZED;
+        local_irq_restore(flags);
+}
+
+struct {
+        int divisor, prescale;
+}
+#ifndef CONFIG_M68VZ328
+ hw_baud_table[18] = {
+        {0,0}, /* 0 */
+        {0,0}, /* 50 */
+        {0,0}, /* 75 */
+        {0,0}, /* 110 */
+        {0,0}, /* 134 */
+        {0,0}, /* 150 */
+        {0,0}, /* 200 */
+        {7,0x26}, /* 300 */
+        {6,0x26}, /* 600 */
+        {5,0x26}, /* 1200 */
+        {0,0}, /* 1800 */
+        {4,0x26}, /* 2400 */
+        {3,0x26}, /* 4800 */
+        {2,0x26}, /* 9600 */
+        {1,0x26}, /* 19200 */
+        {0,0x26}, /* 38400 */
+        {1,0x38}, /* 57600 */
+        {0,0x38}, /* 115200 */
+};
+#else
+ hw_baud_table[18] = {
+                 {0,0}, /* 0 */
+                 {0,0}, /* 50 */
+                 {0,0}, /* 75 */
+                 {0,0}, /* 110 */
+                 {0,0}, /* 134 */
+                 {0,0}, /* 150 */
+                 {0,0}, /* 200 */
+                 {0,0}, /* 300 */
+                 {7,0x26}, /* 600 */
+                 {6,0x26}, /* 1200 */
+                 {0,0}, /* 1800 */
+                 {5,0x26}, /* 2400 */
+                 {4,0x26}, /* 4800 */
+                 {3,0x26}, /* 9600 */
+                 {2,0x26}, /* 19200 */
+                 {1,0x26}, /* 38400 */
+                 {0,0x26}, /* 57600 */
+                 {1,0x38}, /* 115200 */
+}; 
+#endif
+/* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(struct m68k_serial *info)
+{
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned short port;
+        unsigned short ustcnt;
+        unsigned cflag;
+        int     i;
+
+        if (!info->tty || !info->tty->termios)
+                return;
+        cflag = info->tty->termios->c_cflag;
+        if (!(port = info->port))
+                return;
+
+        ustcnt = uart->ustcnt;
+        uart->ustcnt = ustcnt & ~USTCNT_TXEN;
+
+        i = cflag & CBAUD;
+        if (i & CBAUDEX) {
+                i = (i & ~CBAUDEX) + B38400;
+        }
+
+        info->baud = baud_table[i];
+        uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) | 
+                PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
+
+        ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
+        
+        if ((cflag & CSIZE) == CS8)
+                ustcnt |= USTCNT_8_7;
+                
+        if (cflag & CSTOPB)
+                ustcnt |= USTCNT_STOP;
+
+        if (cflag & PARENB)
+                ustcnt |= USTCNT_PARITYEN;
+        if (cflag & PARODD)
+                ustcnt |= USTCNT_ODD_EVEN;
+        
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+        if (cflag & CRTSCTS) {
+                uart->utx.w &= ~ UTX_NOCTS;
+        } else {
+                uart->utx.w |= UTX_NOCTS;
+        }
+#endif
+
+        ustcnt |= USTCNT_TXEN;
+        
+        uart->ustcnt = ustcnt;
+        return;
+}
+
+/*
+ * Fair output driver allows a process to speak.
+ */
+static void rs_fair_output(void)
+{
+        int left;               /* Output no more than that */
+        unsigned long flags;
+        struct m68k_serial *info = &m68k_soft[0];
+        char c;
+
+        if (info == 0) return;
+        if (info->xmit_buf == 0) return;
+
+        local_irq_save(flags);
+        left = info->xmit_cnt;
+        while (left != 0) {
+                c = info->xmit_buf[info->xmit_tail];
+                info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
+                info->xmit_cnt--;
+                local_irq_restore(flags);
+
+                rs_put_char(c);
+
+                local_irq_save(flags);
+                left = min(info->xmit_cnt, left-1);
+        }
+
+        /* Last character is being transmitted now (hopefully). */
+        udelay(5);
+
+        local_irq_restore(flags);
+        return;
+}
+
+/*
+ * m68k_console_print is registered for printk.
+ */
+void console_print_68328(const char *p)
+{
+        char c;
+        
+        while((c=*(p++)) != 0) {
+                if(c == '\n')
+                        rs_put_char('\r');
+                rs_put_char(c);
+        }
+
+        /* Comment this if you want to have a strict interrupt-driven output */
+        rs_fair_output();
+
+        return;
+}
+
+static void rs_set_ldisc(struct tty_struct *tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
+                return;
+
+        info->is_cons = (tty->termios->c_line == N_TTY);
+        
+        printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
+                return;
+#ifndef USE_INTS
+        for(;;) {
+#endif
+
+        /* Enable transmitter */
+        local_irq_save(flags);
+
+        if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+                        !info->xmit_buf) {
+                local_irq_restore(flags);
+                return;
+        }
+
+#ifdef USE_INTS
+        uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
+#else
+        uart->ustcnt |= USTCNT_TXEN;
+#endif
+
+#ifdef USE_INTS
+        if (uart->utx.w & UTX_TX_AVAIL) {
+#else
+        if (1) {
+#endif
+                /* Send char */
+                uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+                info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+                info->xmit_cnt--;
+        }
+
+#ifndef USE_INTS
+        while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
+        }
+#endif
+        local_irq_restore(flags);
+}
+
+extern void console_printn(const char * b, int count);
+
+static int rs_write(struct tty_struct * tty,
+                    const unsigned char *buf, int count)
+{
+        int     c, total = 0;
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+
+        if (serial_paranoia_check(info, tty->name, "rs_write"))
+                return 0;
+
+        if (!tty || !info->xmit_buf)
+                return 0;
+
+        local_save_flags(flags);
+        while (1) {
+                local_irq_disable();            
+                c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+                                   SERIAL_XMIT_SIZE - info->xmit_head));
+                local_irq_restore(flags);
+
+                if (c <= 0)
+                        break;
+
+                memcpy(info->xmit_buf + info->xmit_head, buf, c);
+
+                local_irq_disable();
+                info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
+                info->xmit_cnt += c;
+                local_irq_restore(flags);
+                buf += c;
+                count -= c;
+                total += c;
+        }
+
+        if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
+                /* Enable transmitter */
+                local_irq_disable();            
+#ifndef USE_INTS
+                while(info->xmit_cnt) {
+#endif
+
+                uart->ustcnt |= USTCNT_TXEN;
+#ifdef USE_INTS
+                uart->ustcnt |= USTCNT_TX_INTR_MASK;
+#else
+                while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
+#endif
+                if (uart->utx.w & UTX_TX_AVAIL) {
+                        uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
+                        info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+                        info->xmit_cnt--;
+                }
+
+#ifndef USE_INTS
+                }
+#endif
+                local_irq_restore(flags);
+        }
+
+        return total;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+        int     ret;
+                                
+        if (serial_paranoia_check(info, tty->name, "rs_write_room"))
+                return 0;
+        ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+        if (ret < 0)
+                ret = 0;
+        return ret;
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+                                
+        if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
+                return 0;
+        return info->xmit_cnt;
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+        unsigned long flags;
+                                
+        if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
+                return;
+        local_irq_save(flags);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+        local_irq_restore(flags);
+        tty_wakeup(tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ * 
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_throttle(struct tty_struct * tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_throttle"))
+                return;
+        
+        if (I_IXOFF(tty))
+                info->x_char = STOP_CHAR(tty);
+
+        /* Turn off RTS line (do this atomic) */
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
+                return;
+        
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        info->x_char = START_CHAR(tty);
+        }
+
+        /* Assert RTS line (do this atomic) */
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct m68k_serial * info,
+                           struct serial_struct * retinfo)
+{
+        struct serial_struct tmp;
+  
+        if (!retinfo)
+                return -EFAULT;
+        memset(&tmp, 0, sizeof(tmp));
+        tmp.type = info->type;
+        tmp.line = info->line;
+        tmp.port = info->port;
+        tmp.irq = info->irq;
+        tmp.flags = info->flags;
+        tmp.baud_base = info->baud_base;
+        tmp.close_delay = info->close_delay;
+        tmp.closing_wait = info->closing_wait;
+        tmp.custom_divisor = info->custom_divisor;
+        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+                return -EFAULT;
+
+        return 0;
+}
+
+static int set_serial_info(struct m68k_serial * info,
+                           struct serial_struct * new_info)
+{
+        struct serial_struct new_serial;
+        struct m68k_serial old_info;
+        int                     retval = 0;
+
+        if (!new_info)
+                return -EFAULT;
+        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+                return -EFAULT;
+        old_info = *info;
+
+        if (!capable(CAP_SYS_ADMIN)) {
+                if ((new_serial.baud_base != info->baud_base) ||
+                    (new_serial.type != info->type) ||
+                    (new_serial.close_delay != info->close_delay) ||
+                    ((new_serial.flags & ~S_USR_MASK) !=
+                     (info->flags & ~S_USR_MASK)))
+                        return -EPERM;
+                info->flags = ((info->flags & ~S_USR_MASK) |
+                               (new_serial.flags & S_USR_MASK));
+                info->custom_divisor = new_serial.custom_divisor;
+                goto check_and_exit;
+        }
+
+        if (info->count > 1)
+                return -EBUSY;
+
+        /*
+         * OK, past this point, all the error checking has been done.
+         * At this point, we start making changes.....
+         */
+
+        info->baud_base = new_serial.baud_base;
+        info->flags = ((info->flags & ~S_FLAGS) |
+                        (new_serial.flags & S_FLAGS));
+        info->type = new_serial.type;
+        info->close_delay = new_serial.close_delay;
+        info->closing_wait = new_serial.closing_wait;
+
+check_and_exit:
+        retval = startup(info);
+        return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space. 
+ */
+static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
+{
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+        m68328_uart *uart = &uart_addr[info->line];
+#endif
+        unsigned char status;
+        unsigned long flags;
+
+        local_irq_save(flags);
+#ifdef CONFIG_SERIAL_68328_RTS_CTS
+        status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
+#else
+        status = 0;
+#endif
+        local_irq_restore(flags);
+        return put_user(status, value);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(struct m68k_serial * info, unsigned int duration)
+{
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+        if (!info->port)
+                return;
+        local_irq_save(flags);
+#ifdef USE_INTS 
+        uart->utx.w |= UTX_SEND_BREAK;
+        msleep_interruptible(duration);
+        uart->utx.w &= ~UTX_SEND_BREAK;
+#endif          
+        local_irq_restore(flags);
+}
+
+static int rs_ioctl(struct tty_struct *tty,
+                    unsigned int cmd, unsigned long arg)
+{
+        struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+        int retval;
+
+        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+                return -ENODEV;
+
+        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
+            (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+                if (tty->flags & (1 << TTY_IO_ERROR))
+                    return -EIO;
+        }
+        
+        switch (cmd) {
+                case TCSBRK:    /* SVID version: non-zero arg --> no break */
+                        retval = tty_check_change(tty);
+                        if (retval)
+                                return retval;
+                        tty_wait_until_sent(tty, 0);
+                        if (!arg)
+                                send_break(info, 250);  /* 1/4 second */
+                        return 0;
+                case TCSBRKP:   /* support for POSIX tcsendbreak() */
+                        retval = tty_check_change(tty);
+                        if (retval)
+                                return retval;
+                        tty_wait_until_sent(tty, 0);
+                        send_break(info, arg ? arg*(100) : 250);
+                        return 0;
+                case TIOCGSERIAL:
+                        return get_serial_info(info,
+                                       (struct serial_struct *) arg);
+                case TIOCSSERIAL:
+                        return set_serial_info(info,
+                                               (struct serial_struct *) arg);
+                case TIOCSERGETLSR: /* Get line status register */
+                        return get_lsr_info(info, (unsigned int *) arg);
+                case TIOCSERGSTRUCT:
+                        if (copy_to_user((struct m68k_serial *) arg,
+                                    info, sizeof(struct m68k_serial)))
+                                return -EFAULT;
+                        return 0;
+                default:
+                        return -ENOIOCTLCMD;
+                }
+        return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
+
+        change_speed(info);
+
+        if ((old_termios->c_cflag & CRTSCTS) &&
+            !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                rs_start(tty);
+        }
+        
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ * 
+ * This routine is called when the serial port gets closed.  First, we
+ * wait for the last remaining data to be sent.  Then, we unlink its
+ * S structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+        struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+        m68328_uart *uart = &uart_addr[info->line];
+        unsigned long flags;
+
+        if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
+                return;
+        
+        local_irq_save(flags);
+        
+        if (tty_hung_up_p(filp)) {
+                local_irq_restore(flags);
+                return;
+        }
+        
+        if ((tty->count == 1) && (info->count != 1)) {
+                /*
+                 * Uh, oh.  tty->count is 1, which means that the tty
+                 * structure will be freed.  Info->count should always
+                 * be one in these conditions.  If it's greater than
+                 * one, we've got real problems, since it means the
+                 * serial port won't be shutdown.
+                 */
+                printk("rs_close: bad serial port count; tty->count is 1, "
+                       "info->count is %d\n", info->count);
+                info->count = 1;
+        }
+        if (--info->count < 0) {
+                printk("rs_close: bad serial port count for ttyS%d: %d\n",
+                       info->line, info->count);
+                info->count = 0;
+        }
+        if (info->count) {
+                local_irq_restore(flags);
+                return;
+        }
+        info->flags |= S_CLOSING;
+        /*
+         * Now we wait for the transmit buffer to clear; and we notify 
+         * the line discipline to only process XON/XOFF characters.
+         */
+        tty->closing = 1;
+        if (info->closing_wait != S_CLOSING_WAIT_NONE)
+                tty_wait_until_sent(tty, info->closing_wait);
+        /*
+         * At this point we stop accepting input.  To do this, we
+         * disable the receive line status interrupts, and tell the
+         * interrupt driver to stop checking the data ready bit in the
+         * line status register.
+         */
+
+        uart->ustcnt &= ~USTCNT_RXEN;
+        uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
+
+        shutdown(info);
+        rs_flush_buffer(tty);
+                
+        tty_ldisc_flush(tty);
+        tty->closing = 0;
+        info->event = 0;
+        info->tty = NULL;
+#warning "This is not and has never been valid so fix it"       
+#if 0
+        if (tty->ldisc.num != ldiscs[N_TTY].num) {
+                if (tty->ldisc.close)
+                        (tty->ldisc.close)(tty);
+                tty->ldisc = ldiscs[N_TTY];
+                tty->termios->c_line = N_TTY;
+                if (tty->ldisc.open)
+                        (tty->ldisc.open)(tty);
+        }
+#endif  
+        if (info->blocked_open) {
+                if (info->close_delay) {
+                        msleep_interruptible(jiffies_to_msecs(info->close_delay));
+                }
+                wake_up_interruptible(&info->open_wait);
+        }
+        info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
+        wake_up_interruptible(&info->close_wait);
+        local_irq_restore(flags);
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void rs_hangup(struct tty_struct *tty)
+{
+        struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+        
+        if (serial_paranoia_check(info, tty->name, "rs_hangup"))
+                return;
+        
+        rs_flush_buffer(tty);
+        shutdown(info);
+        info->event = 0;
+        info->count = 0;
+        info->flags &= ~S_NORMAL_ACTIVE;
+        info->tty = NULL;
+        wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+                           struct m68k_serial *info)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        int             retval;
+        int             do_clocal = 0;
+
+        /*
+         * If the device is in the middle of being closed, then block
+         * until it's done, and then try again.
+         */
+        if (info->flags & S_CLOSING) {
+                interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+                if (info->flags & S_HUP_NOTIFY)
+                        return -EAGAIN;
+                else
+                        return -ERESTARTSYS;
+#else
+                return -EAGAIN;
+#endif
+        }
+        
+        /*
+         * If non-blocking mode is set, or the port is not enabled,
+         * then make the check up front and then exit.
+         */
+        if ((filp->f_flags & O_NONBLOCK) ||
+            (tty->flags & (1 << TTY_IO_ERROR))) {
+                info->flags |= S_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (tty->termios->c_cflag & CLOCAL)
+                do_clocal = 1;
+
+        /*
+         * Block waiting for the carrier detect and the line to become
+         * free (i.e., not in use by the callout).  While we are in
+         * this loop, info->count is dropped by one, so that
+         * rs_close() knows when to free things.  We restore it upon
+         * exit, either normal or abnormal.
+         */
+        retval = 0;
+        add_wait_queue(&info->open_wait, &wait);
+
+        info->count--;
+        info->blocked_open++;
+        while (1) {
+                local_irq_disable();
+                m68k_rtsdtr(info, 1);
+                local_irq_enable();
+                current->state = TASK_INTERRUPTIBLE;
+                if (tty_hung_up_p(filp) ||
+                    !(info->flags & S_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+                        if (info->flags & S_HUP_NOTIFY)
+                                retval = -EAGAIN;
+                        else
+                                retval = -ERESTARTSYS;  
+#else
+                        retval = -EAGAIN;
+#endif
+                        break;
+                }
+                if (!(info->flags & S_CLOSING) && do_clocal)
+                        break;
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+        current->state = TASK_RUNNING;
+        remove_wait_queue(&info->open_wait, &wait);
+        if (!tty_hung_up_p(filp))
+                info->count++;
+        info->blocked_open--;
+
+        if (retval)
+                return retval;
+        info->flags |= S_NORMAL_ACTIVE;
+        return 0;
+}       
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * enables interrupts for a serial port, linking in its S structure into
+ * the IRQ chain.   It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+int rs_open(struct tty_struct *tty, struct file * filp)
+{
+        struct m68k_serial      *info;
+        int                     retval, line;
+
+        line = tty->index;
+        
+        if (line >= NR_PORTS || line < 0) /* we have exactly one */
+                return -ENODEV;
+
+        info = &m68k_soft[line];
+
+        if (serial_paranoia_check(info, tty->name, "rs_open"))
+                return -ENODEV;
+
+        info->count++;
+        tty->driver_data = info;
+        info->tty = tty;
+
+        /*
+         * Start up serial port
+         */
+        retval = startup(info);
+        if (retval)
+                return retval;
+
+        return block_til_ready(tty, filp, info);
+}
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void show_serial_version(void)
+{
+        printk("MC68328 serial driver version 1.00\n");
+}
+
+static const struct tty_operations rs_ops = {
+        .open = rs_open,
+        .close = rs_close,
+        .write = rs_write,
+        .flush_chars = rs_flush_chars,
+        .write_room = rs_write_room,
+        .chars_in_buffer = rs_chars_in_buffer,
+        .flush_buffer = rs_flush_buffer,
+        .ioctl = rs_ioctl,
+        .throttle = rs_throttle,
+        .unthrottle = rs_unthrottle,
+        .set_termios = rs_set_termios,
+        .stop = rs_stop,
+        .start = rs_start,
+        .hangup = rs_hangup,
+        .set_ldisc = rs_set_ldisc,
+};
+
+/* rs_init inits the driver */
+static int __init
+rs68328_init(void)
+{
+        int flags, i;
+        struct m68k_serial *info;
+
+        serial_driver = alloc_tty_driver(NR_PORTS);
+        if (!serial_driver)
+                return -ENOMEM;
+
+        show_serial_version();
+
+        /* Initialize the tty_driver structure */
+        /* SPARC: Not all of this is exactly right for us. */
+        
+        serial_driver->name = "ttyS";
+        serial_driver->major = TTY_MAJOR;
+        serial_driver->minor_start = 64;
+        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        serial_driver->subtype = SERIAL_TYPE_NORMAL;
+        serial_driver->init_termios = tty_std_termios;
+        serial_driver->init_termios.c_cflag = 
+                        m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
+        serial_driver->flags = TTY_DRIVER_REAL_RAW;
+        tty_set_operations(serial_driver, &rs_ops);
+
+        if (tty_register_driver(serial_driver)) {
+                put_tty_driver(serial_driver);
+                printk(KERN_ERR "Couldn't register serial driver\n");
+                return -ENOMEM;
+        }
+
+        local_irq_save(flags);
+
+        for(i=0;i<NR_PORTS;i++) {
+
+            info = &m68k_soft[i];
+            info->magic = SERIAL_MAGIC;
+            info->port = (int) &uart_addr[i];
+            info->tty = NULL;
+            info->irq = uart_irqs[i];
+            info->custom_divisor = 16;
+            info->close_delay = 50;
+            info->closing_wait = 3000;
+            info->x_char = 0;
+            info->event = 0;
+            info->count = 0;
+            info->blocked_open = 0;
+            INIT_WORK(&info->tqueue, do_softint);
+            init_waitqueue_head(&info->open_wait);
+            init_waitqueue_head(&info->close_wait);
+            info->line = i;
+            info->is_cons = 1; /* Means shortcuts work */
+            
+            printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, 
+                   info->port, info->irq);
+            printk(" is a builtin MC68328 UART\n");
+            
+#ifdef CONFIG_M68VZ328
+                if (i > 0 )
+                        PJSEL &= 0xCF;  /* PSW enable second port output */
+#endif
+
+            if (request_irq(uart_irqs[i],
+                            rs_interrupt,
+                            IRQF_DISABLED,
+                            "M68328_UART", info))
+                panic("Unable to attach 68328 serial interrupt\n");
+        }
+        local_irq_restore(flags);
+        return 0;
+}
+
+module_init(rs68328_init);
+
+
+
+static void m68328_set_baud(void)
+{
+        unsigned short ustcnt;
+        int     i;
+
+        ustcnt = USTCNT;
+        USTCNT = ustcnt & ~USTCNT_TXEN;
+
+again:
+        for (i = 0; i < ARRAY_SIZE(baud_table); i++)
+                if (baud_table[i] == m68328_console_baud)
+                        break;
+        if (i >= ARRAY_SIZE(baud_table)) {
+                m68328_console_baud = 9600;
+                goto again;
+        }
+
+        UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) | 
+                PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
+        ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
+        ustcnt |= USTCNT_8_7;
+        ustcnt |= USTCNT_TXEN;
+        USTCNT = ustcnt;
+        m68328_console_initted = 1;
+        return;
+}
+
+
+int m68328_console_setup(struct console *cp, char *arg)
+{
+        int             i, n = CONSOLE_BAUD_RATE;
+
+        if (!cp)
+                return(-1);
+
+        if (arg)
+                n = simple_strtoul(arg,NULL,0);
+
+        for (i = 0; i < ARRAY_SIZE(baud_table); i++)
+                if (baud_table[i] == n)
+                        break;
+        if (i < ARRAY_SIZE(baud_table)) {
+                m68328_console_baud = n;
+                m68328_console_cbaud = 0;
+                if (i > 15) {
+                        m68328_console_cbaud |= CBAUDEX;
+                        i -= 15;
+                }
+                m68328_console_cbaud |= i;
+        }
+
+        m68328_set_baud(); /* make sure baud rate changes */
+        return(0);
+}
+
+
+static struct tty_driver *m68328_console_device(struct console *c, int *index)
+{
+        *index = c->index;
+        return serial_driver;
+}
+
+
+void m68328_console_write (struct console *co, const char *str,
+                           unsigned int count)
+{
+        if (!m68328_console_initted)
+                m68328_set_baud();
+    while (count--) {
+        if (*str == '\n')
+           rs_put_char('\r');
+        rs_put_char( *str++ );
+    }
+}
+
+
+static struct console m68328_driver = {
+        .name           = "ttyS",
+        .write          = m68328_console_write,
+        .device         = m68328_console_device,
+        .setup          = m68328_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+};
+
+
+static int __init m68328_console_init(void)
+{
+        register_console(&m68328_driver);
+        return 0;
+}
+
+console_initcall(m68328_console_init);
diff --git a/drivers/tty/serial/68328serial.h b/drivers/tty/serial/68328serial.h
new file mode 100644
index 000000000000..8c9c3c0745db
--- /dev/null
+++ b/drivers/tty/serial/68328serial.h
@@ -0,0 +1,187 @@
+/* 68328serial.h: Definitions for the mc68328 serial driver.
+ *
+ * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
+ * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
+ * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
+ * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
+ *
+ * VZ Support/Fixes             Evan Stawnyczy <e@lineo.ca>
+ */
+
+#ifndef _MC683XX_SERIAL_H
+#define _MC683XX_SERIAL_H
+
+
+struct serial_struct {
+        int     type;
+        int     line;
+        int     port;
+        int     irq;
+        int     flags;
+        int     xmit_fifo_size;
+        int     custom_divisor;
+        int     baud_base;
+        unsigned short  close_delay;
+        char    reserved_char[2];
+        int     hub6;  /* FIXME: We don't have AT&T Hub6 boards! */
+        unsigned short  closing_wait; /* time to wait before closing */
+        unsigned short  closing_wait2; /* no longer used... */
+        int     reserved[4];
+};
+
+/*
+ * For the close wait times, 0 means wait forever for serial port to
+ * flush its output.  65535 means don't wait at all.
+ */
+#define S_CLOSING_WAIT_INF      0
+#define S_CLOSING_WAIT_NONE     65535
+
+/*
+ * Definitions for S_struct (and serial_struct) flags field
+ */
+#define S_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes 
+                                   on the callout port */
+#define S_FOURPORT  0x0002      /* Set OU1, OUT2 per AST Fourport settings */
+#define S_SAK   0x0004  /* Secure Attention Key (Orange book) */
+#define S_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */
+
+#define S_SPD_MASK      0x0030
+#define S_SPD_HI        0x0010  /* Use 56000 instead of 38400 bps */
+
+#define S_SPD_VHI       0x0020  /* Use 115200 instead of 38400 bps */
+#define S_SPD_CUST      0x0030  /* Use user-specified divisor */
+
+#define S_SKIP_TEST     0x0040 /* Skip UART test during autoconfiguration */
+#define S_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */
+#define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
+#define S_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
+#define S_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */
+
+#define S_FLAGS 0x0FFF  /* Possible legal S flags */
+#define S_USR_MASK 0x0430       /* Legal flags that non-privileged
+                                 * users can set or reset */
+
+/* Internal flags used only by kernel/chr_drv/serial.c */
+#define S_INITIALIZED   0x80000000 /* Serial port was initialized */
+#define S_CALLOUT_ACTIVE        0x40000000 /* Call out device is active */
+#define S_NORMAL_ACTIVE 0x20000000 /* Normal device is active */
+#define S_BOOT_AUTOCONF 0x10000000 /* Autoconfigure port on bootup */
+#define S_CLOSING               0x08000000 /* Serial port is closing */
+#define S_CTS_FLOW              0x04000000 /* Do CTS flow control */
+#define S_CHECK_CD              0x02000000 /* i.e., CLOCAL */
+
+/* Software state per channel */
+
+#ifdef __KERNEL__
+
+/*
+ * I believe this is the optimal setting that reduces the number of interrupts.
+ * At high speeds the output might become a little "bursted" (use USTCNT_TXHE
+ * if that bothers you), but in most cases it will not, since we try to 
+ * transmit characters every time rs_interrupt is called. Thus, quite often
+ * you'll see that a receive interrupt occures before the transmit one.
+ *                                  -- Vladimir Gurevich
+ */
+#define USTCNT_TX_INTR_MASK (USTCNT_TXEE)
+
+/*
+ * 68328 and 68EZ328 UARTS are a little bit different. EZ328 has special
+ * "Old data interrupt" which occures whenever the data stay in the FIFO
+ * longer than 30 bits time. This allows us to use FIFO without compromising
+ * latency. '328 does not have this feature and without the real  328-based
+ * board I would assume that RXRE is the safest setting.
+ *
+ * For EZ328 I use RXHE (Half empty) interrupt to reduce the number of
+ * interrupts. RXFE (receive queue full) causes the system to lose data
+ * at least at 115200 baud
+ *
+ * If your board is busy doing other stuff, you might consider to use
+ * RXRE (data ready intrrupt) instead.
+ *
+ * The other option is to make these INTR masks run-time configurable, so
+ * that people can dynamically adapt them according to the current usage.
+ *                                  -- Vladimir Gurevich
+ */
+
+/* (es) */
+#if defined(CONFIG_M68EZ328) || defined(CONFIG_M68VZ328)
+#define USTCNT_RX_INTR_MASK (USTCNT_RXHE | USTCNT_ODEN)
+#elif defined(CONFIG_M68328)
+#define USTCNT_RX_INTR_MASK (USTCNT_RXRE)
+#else
+#error Please, define the Rx interrupt events for your CPU
+#endif
+/* (/es) */
+
+/*
+ * This is our internal structure for each serial port's state.
+ * 
+ * Many fields are paralleled by the structure used by the serial_struct
+ * structure.
+ *
+ * For definitions of the flags field, see tty.h
+ */
+
+struct m68k_serial {
+        char soft_carrier;  /* Use soft carrier on this channel */
+        char break_abort;   /* Is serial console in, so process brk/abrt */
+        char is_cons;       /* Is this our console. */
+
+        /* We need to know the current clock divisor
+         * to read the bps rate the chip has currently
+         * loaded.
+         */
+        unsigned char clk_divisor;  /* May be 1, 16, 32, or 64 */
+        int baud;
+        int                     magic;
+        int                     baud_base;
+        int                     port;
+        int                     irq;
+        int                     flags;          /* defined in tty.h */
+        int                     type;           /* UART type */
+        struct tty_struct       *tty;
+        int                     read_status_mask;
+        int                     ignore_status_mask;
+        int                     timeout;
+        int                     xmit_fifo_size;
+        int                     custom_divisor;
+        int                     x_char; /* xon/xoff character */
+        int                     close_delay;
+        unsigned short          closing_wait;
+        unsigned short          closing_wait2;
+        unsigned long           event;
+        unsigned long           last_active;
+        int                     line;
+        int                     count;      /* # of fd on device */
+        int                     blocked_open; /* # of blocked opens */
+        unsigned char           *xmit_buf;
+        int                     xmit_head;
+        int                     xmit_tail;
+        int                     xmit_cnt;
+        struct work_struct      tqueue;
+        wait_queue_head_t       open_wait;
+        wait_queue_head_t       close_wait;
+};
+
+
+#define SERIAL_MAGIC 0x5301
+
+/*
+ * The size of the serial xmit buffer is 1 page, or 4096 bytes
+ */
+#define SERIAL_XMIT_SIZE 4096
+
+/*
+ * Events are used to schedule things to happen at timer-interrupt
+ * time, instead of at rs interrupt time.
+ */
+#define RS_EVENT_WRITE_WAKEUP   0
+
+/* 
+ * Define the number of ports supported and their irqs.
+ */
+#define NR_PORTS 1
+#define UART_IRQ_DEFNS {UART_IRQ_NUM}
+
+#endif /* __KERNEL__ */
+#endif /* !(_MC683XX_SERIAL_H) */
diff --git a/drivers/tty/serial/68360serial.c b/drivers/tty/serial/68360serial.c
new file mode 100644
index 000000000000..0a3e8787ed50
--- /dev/null
+++ b/drivers/tty/serial/68360serial.c
@@ -0,0 +1,2979 @@
+/*
+ *  UART driver for 68360 CPM SCC or SMC
+ *  Copyright (c) 2000 D. Jeff Dionne <jeff@uclinux.org>,
+ *  Copyright (c) 2000 Michael Leslie <mleslie@lineo.ca>
+ *  Copyright (c) 1997 Dan Malek <dmalek@jlc.net>
+ *
+ * I used the serial.c driver as the framework for this driver.
+ * Give credit to those guys.
+ * The original code was written for the MBX860 board.  I tried to make
+ * it generic, but there may be some assumptions in the structures that
+ * have to be fixed later.
+ * To save porting time, I did not bother to change any object names
+ * that are not accessed outside of this file.
+ * It still needs lots of work........When it was easy, I included code
+ * to support the SCCs, but this has never been tested, nor is it complete.
+ * Only the SCCs support modem control, so that is not complete either.
+ *
+ * This module exports the following rs232 io functions:
+ *
+ *      int rs_360_init(void);
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serialP.h> 
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <asm/irq.h>
+#include <asm/m68360.h>
+#include <asm/commproc.h>
+
+ 
+#ifdef CONFIG_KGDB
+extern void breakpoint(void);
+extern void set_debug_traps(void);
+extern int  kgdb_output_string (const char* s, unsigned int count);
+#endif
+
+
+/* #ifdef CONFIG_SERIAL_CONSOLE */ /* This seems to be a post 2.0 thing - mles */
+#include <linux/console.h>
+#include <linux/jiffies.h>
+
+/* this defines the index into rs_table for the port to use
+ */
+#ifndef CONFIG_SERIAL_CONSOLE_PORT
+#define CONFIG_SERIAL_CONSOLE_PORT      1 /* ie SMC2 - note USE_SMC2 must be defined */
+#endif
+/* #endif */
+
+#if 0
+/* SCC2 for console
+ */
+#undef CONFIG_SERIAL_CONSOLE_PORT
+#define CONFIG_SERIAL_CONSOLE_PORT      2
+#endif
+
+
+#define TX_WAKEUP       ASYNC_SHARE_IRQ
+
+static char *serial_name = "CPM UART driver";
+static char *serial_version = "0.03";
+
+static struct tty_driver *serial_driver;
+int serial_console_setup(struct console *co, char *options);
+
+/*
+ * Serial driver configuration section.  Here are the various options:
+ */
+#define SERIAL_PARANOIA_CHECK
+#define CONFIG_SERIAL_NOPAUSE_IO
+#define SERIAL_DO_RESTART
+
+/* Set of debugging defines */
+
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+
+#define _INLINE_ inline
+  
+#define DBG_CNT(s)
+
+/* We overload some of the items in the data structure to meet our
+ * needs.  For example, the port address is the CPM parameter ram
+ * offset for the SCC or SMC.  The maximum number of ports is 4 SCCs and
+ * 2 SMCs.  The "hub6" field is used to indicate the channel number, with
+ * a flag indicating SCC or SMC, and the number is used as an index into
+ * the CPM parameter area for this device.
+ * The "type" field is currently set to 0, for PORT_UNKNOWN.  It is
+ * not currently used.  I should probably use it to indicate the port
+ * type of SMC or SCC.
+ * The SMCs do not support any modem control signals.
+ */
+#define smc_scc_num     hub6
+#define NUM_IS_SCC      ((int)0x00010000)
+#define PORT_NUM(P)     ((P) & 0x0000ffff)
+
+
+#if defined (CONFIG_UCQUICC)
+
+volatile extern void *_periph_base;
+/* sipex transceiver
+ *   mode bits for       are on pins
+ *
+ *    SCC2                d16..19
+ *    SCC3                d20..23
+ *    SCC4                d24..27
+ */
+#define SIPEX_MODE(n,m) ((m & 0x0f)<<(16+4*(n-1)))
+
+static uint sipex_mode_bits = 0x00000000;
+
+#endif
+
+/* There is no `serial_state' defined back here in 2.0.
+ * Try to get by with serial_struct
+ */
+/* #define serial_state serial_struct */
+
+/* 2.4 -> 2.0 portability problem: async_icount in 2.4 has a few
+ * extras: */
+
+#if 0
+struct async_icount_24 {
+        __u32   cts, dsr, rng, dcd, tx, rx;
+        __u32   frame, parity, overrun, brk;
+        __u32   buf_overrun;
+} icount;
+#endif
+
+#if 0
+
+struct serial_state {
+        int     magic;
+        int     baud_base;
+        unsigned long   port;
+        int     irq;
+        int     flags;
+        int     hub6;
+        int     type;
+        int     line;
+        int     revision;       /* Chip revision (950) */
+        int     xmit_fifo_size;
+        int     custom_divisor;
+        int     count;
+        u8      *iomem_base;
+        u16     iomem_reg_shift;
+        unsigned short  close_delay;
+        unsigned short  closing_wait; /* time to wait before closing */
+        struct async_icount_24     icount; 
+        int     io_type;
+        struct async_struct *info;
+};
+#endif
+
+#define SSTATE_MAGIC 0x5302
+
+
+
+/* SMC2 is sometimes used for low performance TDM interfaces.  Define
+ * this as 1 if you want SMC2 as a serial port UART managed by this driver.
+ * Define this as 0 if you wish to use SMC2 for something else.
+ */
+#define USE_SMC2 1
+
+#if 0
+/* Define SCC to ttySx mapping. */
+#define SCC_NUM_BASE    (USE_SMC2 + 1)  /* SCC base tty "number" */
+
+/* Define which SCC is the first one to use for a serial port.  These
+ * are 0-based numbers, i.e. this assumes the first SCC (SCC1) is used
+ * for Ethernet, and the first available SCC for serial UART is SCC2.
+ * NOTE:  IF YOU CHANGE THIS, you have to change the PROFF_xxx and
+ * interrupt vectors in the table below to match.
+ */
+#define SCC_IDX_BASE    1       /* table index */
+#endif
+
+
+/* Processors other than the 860 only get SMCs configured by default.
+ * Either they don't have SCCs or they are allocated somewhere else.
+ * Of course, there are now 860s without some SCCs, so we will need to
+ * address that someday.
+ * The Embedded Planet Multimedia I/O cards use TDM interfaces to the
+ * stereo codec parts, and we use SMC2 to help support that.
+ */
+static struct serial_state rs_table[] = {
+/*  type   line   PORT           IRQ       FLAGS  smc_scc_num (F.K.A. hub6) */
+        {  0,     0, PRSLOT_SMC1, CPMVEC_SMC1,   0,    0 }    /* SMC1 ttyS0 */
+#if USE_SMC2
+        ,{ 0,     0, PRSLOT_SMC2, CPMVEC_SMC2,   0,    1 }     /* SMC2 ttyS1 */
+#endif
+
+#if defined(CONFIG_SERIAL_68360_SCC)
+        ,{ 0,     0, PRSLOT_SCC2, CPMVEC_SCC2,   0, (NUM_IS_SCC | 1) }    /* SCC2 ttyS2 */
+        ,{ 0,     0, PRSLOT_SCC3, CPMVEC_SCC3,   0, (NUM_IS_SCC | 2) }    /* SCC3 ttyS3 */
+        ,{ 0,     0, PRSLOT_SCC4, CPMVEC_SCC4,   0, (NUM_IS_SCC | 3) }    /* SCC4 ttyS4 */
+#endif
+};
+
+#define NR_PORTS        (sizeof(rs_table)/sizeof(struct serial_state))
+
+/* The number of buffer descriptors and their sizes.
+ */
+#define RX_NUM_FIFO     4
+#define RX_BUF_SIZE     32
+#define TX_NUM_FIFO     4
+#define TX_BUF_SIZE     32
+
+#define CONSOLE_NUM_FIFO 2
+#define CONSOLE_BUF_SIZE 4
+
+char *console_fifos[CONSOLE_NUM_FIFO * CONSOLE_BUF_SIZE];
+
+/* The async_struct in serial.h does not really give us what we
+ * need, so define our own here.
+ */
+typedef struct serial_info {
+        int                     magic;
+        int                     flags;
+
+        struct serial_state     *state;
+        /* struct serial_struct *state; */
+        /* struct async_struct  *state; */
+        
+        struct tty_struct       *tty;
+        int                     read_status_mask;
+        int                     ignore_status_mask;
+        int                     timeout;
+        int                     line;
+        int                     x_char; /* xon/xoff character */
+        int                     close_delay;
+        unsigned short          closing_wait;
+        unsigned short          closing_wait2;
+        unsigned long           event;
+        unsigned long           last_active;
+        int                     blocked_open; /* # of blocked opens */
+        struct work_struct      tqueue;
+        struct work_struct      tqueue_hangup;
+        wait_queue_head_t       open_wait; 
+        wait_queue_head_t       close_wait; 
+
+        
+/* CPM Buffer Descriptor pointers.
+        */
+        QUICC_BD                        *rx_bd_base;
+        QUICC_BD                        *rx_cur;
+        QUICC_BD                        *tx_bd_base;
+        QUICC_BD                        *tx_cur;
+} ser_info_t;
+
+
+/* since kmalloc_init() does not get called until much after this initialization: */
+static ser_info_t  quicc_ser_info[NR_PORTS];
+static char rx_buf_pool[NR_PORTS * RX_NUM_FIFO * RX_BUF_SIZE];
+static char tx_buf_pool[NR_PORTS * TX_NUM_FIFO * TX_BUF_SIZE];
+
+static void change_speed(ser_info_t *info);
+static void rs_360_wait_until_sent(struct tty_struct *tty, int timeout);
+
+static inline int serial_paranoia_check(ser_info_t *info,
+                                        char *name, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+        static const char *badmagic =
+                "Warning: bad magic number for serial struct (%s) in %s\n";
+        static const char *badinfo =
+                "Warning: null async_struct for (%s) in %s\n";
+
+        if (!info) {
+                printk(badinfo, name, routine);
+                return 1;
+        }
+        if (info->magic != SERIAL_MAGIC) {
+                printk(badmagic, name, routine);
+                return 1;
+        }
+#endif
+        return 0;
+}
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts,
+ * indexed by the termio value.  The generic CPM functions are responsible
+ * for setting and assigning baud rate generators for us.
+ */
+static int baud_table[] = {
+        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+        9600, 19200, 38400, 57600, 115200, 230400, 460800, 0 };
+
+/* This sucks. There is a better way: */
+#if defined(CONFIG_CONSOLE_9600)
+  #define CONSOLE_BAUDRATE 9600
+#elif defined(CONFIG_CONSOLE_19200)
+  #define CONSOLE_BAUDRATE 19200
+#elif defined(CONFIG_CONSOLE_115200)
+  #define CONSOLE_BAUDRATE 115200
+#else
+  #warning "console baud rate undefined"
+  #define CONSOLE_BAUDRATE 9600
+#endif
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void rs_360_stop(struct tty_struct *tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        int     idx;
+        unsigned long flags;
+        volatile struct scc_regs *sccp;
+        volatile struct smc_regs *smcp;
+
+        if (serial_paranoia_check(info, tty->name, "rs_stop"))
+                return;
+        
+        local_irq_save(flags);
+        idx = PORT_NUM(info->state->smc_scc_num);
+        if (info->state->smc_scc_num & NUM_IS_SCC) {
+                sccp = &pquicc->scc_regs[idx];
+                sccp->scc_sccm &= ~UART_SCCM_TX;
+        } else {
+                /* smcp = &cpmp->cp_smc[idx]; */
+                smcp = &pquicc->smc_regs[idx];
+                smcp->smc_smcm &= ~SMCM_TX;
+        }
+        local_irq_restore(flags);
+}
+
+
+static void rs_360_start(struct tty_struct *tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        int     idx;
+        unsigned long flags;
+        volatile struct scc_regs *sccp;
+        volatile struct smc_regs *smcp;
+
+        if (serial_paranoia_check(info, tty->name, "rs_stop"))
+                return;
+        
+        local_irq_save(flags);
+        idx = PORT_NUM(info->state->smc_scc_num);
+        if (info->state->smc_scc_num & NUM_IS_SCC) {
+                sccp = &pquicc->scc_regs[idx];
+                sccp->scc_sccm |= UART_SCCM_TX;
+        } else {
+                smcp = &pquicc->smc_regs[idx];
+                smcp->smc_smcm |= SMCM_TX;
+        }
+        local_irq_restore(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines.  All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt().  They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off.  People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible.  After you are done making modifications, it is not a bad
+ * idea to do:
+ * 
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+static _INLINE_ void receive_chars(ser_info_t *info)
+{
+        struct tty_struct *tty = info->port.tty;
+        unsigned char ch, flag, *cp;
+        /*int   ignored = 0;*/
+        int     i;
+        ushort  status;
+         struct async_icount *icount; 
+        /* struct       async_icount_24 *icount; */
+        volatile QUICC_BD       *bdp;
+
+        icount = &info->state->icount;
+
+        /* Just loop through the closed BDs and copy the characters into
+         * the buffer.
+         */
+        bdp = info->rx_cur;
+        for (;;) {
+                if (bdp->status & BD_SC_EMPTY)  /* If this one is empty */
+                        break;                  /*   we are all done */
+
+                /* The read status mask tell us what we should do with
+                 * incoming characters, especially if errors occur.
+                 * One special case is the use of BD_SC_EMPTY.  If
+                 * this is not set, we are supposed to be ignoring
+                 * inputs.  In this case, just mark the buffer empty and
+                 * continue.
+                 */
+                if (!(info->read_status_mask & BD_SC_EMPTY)) {
+                        bdp->status |= BD_SC_EMPTY;
+                        bdp->status &=
+                                ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);
+
+                        if (bdp->status & BD_SC_WRAP)
+                                bdp = info->rx_bd_base;
+                        else
+                                bdp++;
+                        continue;
+                }
+
+                /* Get the number of characters and the buffer pointer.
+                */
+                i = bdp->length;
+                /* cp = (unsigned char *)__va(bdp->buf); */
+                cp = (char *)bdp->buf;
+                status = bdp->status;
+
+                while (i-- > 0) {
+                        ch = *cp++;
+                        icount->rx++;
+
+#ifdef SERIAL_DEBUG_INTR
+                        printk("DR%02x:%02x...", ch, status);
+#endif
+                        flag = TTY_NORMAL;
+
+                        if (status & (BD_SC_BR | BD_SC_FR |
+                                       BD_SC_PR | BD_SC_OV)) {
+                                /*
+                                 * For statistics only
+                                 */
+                                if (status & BD_SC_BR)
+                                        icount->brk++;
+                                else if (status & BD_SC_PR)
+                                        icount->parity++;
+                                else if (status & BD_SC_FR)
+                                        icount->frame++;
+                                if (status & BD_SC_OV)
+                                        icount->overrun++;
+
+                                /*
+                                 * Now check to see if character should be
+                                 * ignored, and mask off conditions which
+                                 * should be ignored.
+                                if (status & info->ignore_status_mask) {
+                                        if (++ignored > 100)
+                                                break;
+                                        continue;
+                                }
+                                 */
+                                status &= info->read_status_mask;
+                
+                                if (status & (BD_SC_BR)) {
+#ifdef SERIAL_DEBUG_INTR
+                                        printk("handling break....");
+#endif
+                                        *tty->flip.flag_buf_ptr = TTY_BREAK;
+                                        if (info->flags & ASYNC_SAK)
+                                                do_SAK(tty);
+                                } else if (status & BD_SC_PR)
+                                        flag = TTY_PARITY;
+                                else if (status & BD_SC_FR)
+                                        flag = TTY_FRAME;
+                        }
+                        tty_insert_flip_char(tty, ch, flag);
+                        if (status & BD_SC_OV)
+                                /*
+                                 * Overrun is special, since it's
+                                 * reported immediately, and doesn't
+                                 * affect the current character
+                                 */
+                                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                }
+
+                /* This BD is ready to be used again.  Clear status.
+                 * Get next BD.
+                 */
+                bdp->status |= BD_SC_EMPTY;
+                bdp->status &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV);
+
+                if (bdp->status & BD_SC_WRAP)
+                        bdp = info->rx_bd_base;
+                else
+                        bdp++;
+        }
+
+        info->rx_cur = (QUICC_BD *)bdp;
+
+        tty_schedule_flip(tty);
+}
+
+static _INLINE_ void receive_break(ser_info_t *info)
+{
+        struct tty_struct *tty = info->port.tty;
+
+        info->state->icount.brk++;
+        /* Check to see if there is room in the tty buffer for
+         * the break.  If not, we exit now, losing the break.  FIXME
+         */
+        tty_insert_flip_char(tty, 0, TTY_BREAK);
+        tty_schedule_flip(tty);
+}
+
+static _INLINE_ void transmit_chars(ser_info_t *info)
+{
+
+        if ((info->flags & TX_WAKEUP) ||
+            (info->port.tty->flags & (1 << TTY_DO_WRITE_WAKEUP))) {
+                schedule_work(&info->tqueue);
+        }
+
+#ifdef SERIAL_DEBUG_INTR
+        printk("THRE...");
+#endif
+}
+
+#ifdef notdef
+        /* I need to do this for the SCCs, so it is left as a reminder.
+        */
+static _INLINE_ void check_modem_status(struct async_struct *info)
+{
+        int     status;
+        /* struct       async_icount *icount; */
+        struct  async_icount_24 *icount;
+        
+        status = serial_in(info, UART_MSR);
+
+        if (status & UART_MSR_ANY_DELTA) {
+                icount = &info->state->icount;
+                /* update input line counters */
+                if (status & UART_MSR_TERI)
+                        icount->rng++;
+                if (status & UART_MSR_DDSR)
+                        icount->dsr++;
+                if (status & UART_MSR_DDCD) {
+                        icount->dcd++;
+#ifdef CONFIG_HARD_PPS
+                        if ((info->flags & ASYNC_HARDPPS_CD) &&
+                            (status & UART_MSR_DCD))
+                                hardpps();
+#endif
+                }
+                if (status & UART_MSR_DCTS)
+                        icount->cts++;
+                wake_up_interruptible(&info->delta_msr_wait);
+        }
+
+        if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
+#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
+                printk("ttys%d CD now %s...", info->line,
+                       (status & UART_MSR_DCD) ? "on" : "off");
+#endif          
+                if (status & UART_MSR_DCD)
+                        wake_up_interruptible(&info->open_wait);
+                else {
+#ifdef SERIAL_DEBUG_OPEN
+                        printk("scheduling hangup...");
+#endif
+                        queue_task(&info->tqueue_hangup,
+                                           &tq_scheduler);
+                }
+        }
+        if (info->flags & ASYNC_CTS_FLOW) {
+                if (info->port.tty->hw_stopped) {
+                        if (status & UART_MSR_CTS) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+                                printk("CTS tx start...");
+#endif
+                                info->port.tty->hw_stopped = 0;
+                                info->IER |= UART_IER_THRI;
+                                serial_out(info, UART_IER, info->IER);
+                                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+                                return;
+                        }
+                } else {
+                        if (!(status & UART_MSR_CTS)) {
+#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
+                                printk("CTS tx stop...");
+#endif
+                                info->port.tty->hw_stopped = 1;
+                                info->IER &= ~UART_IER_THRI;
+                                serial_out(info, UART_IER, info->IER);
+                        }
+                }
+        }
+}
+#endif
+
+/*
+ * This is the serial driver's interrupt routine for a single port
+ */
+/* static void rs_360_interrupt(void *dev_id) */ /* until and if we start servicing irqs here */
+static void rs_360_interrupt(int vec, void *dev_id)
+{
+        u_char  events;
+        int     idx;
+        ser_info_t *info;
+        volatile struct smc_regs *smcp;
+        volatile struct scc_regs *sccp;
+        
+        info = dev_id;
+
+        idx = PORT_NUM(info->state->smc_scc_num);
+        if (info->state->smc_scc_num & NUM_IS_SCC) {
+                sccp = &pquicc->scc_regs[idx];
+                events = sccp->scc_scce;
+                if (events & SCCM_RX)
+                        receive_chars(info);
+                if (events & SCCM_TX)
+                        transmit_chars(info);
+                sccp->scc_scce = events;
+        } else {
+                smcp = &pquicc->smc_regs[idx];
+                events = smcp->smc_smce;
+                if (events & SMCM_BRKE)
+                        receive_break(info);
+                if (events & SMCM_RX)
+                        receive_chars(info);
+                if (events & SMCM_TX)
+                        transmit_chars(info);
+                smcp->smc_smce = events;
+        }
+        
+#ifdef SERIAL_DEBUG_INTR
+        printk("rs_interrupt_single(%d, %x)...",
+                                        info->state->smc_scc_num, events);
+#endif
+#ifdef modem_control
+        check_modem_status(info);
+#endif
+        info->last_active = jiffies;
+#ifdef SERIAL_DEBUG_INTR
+        printk("end.\n");
+#endif
+}
+
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+
+static void do_softint(void *private_)
+{
+        ser_info_t      *info = (ser_info_t *) private_;
+        struct tty_struct       *tty;
+        
+        tty = info->port.tty;
+        if (!tty)
+                return;
+
+        if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
+                tty_wakeup(tty);
+}
+
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred.  The path of
+ * hangup processing is:
+ *
+ *      serial interrupt routine -> (scheduler tqueue) ->
+ *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
+ * 
+ */
+static void do_serial_hangup(void *private_)
+{
+        struct async_struct     *info = (struct async_struct *) private_;
+        struct tty_struct       *tty;
+        
+        tty = info->port.tty;
+        if (!tty)
+                return;
+
+        tty_hangup(tty);
+}
+
+
+static int startup(ser_info_t *info)
+{
+        unsigned long flags;
+        int     retval=0;
+        int     idx;
+        /*struct serial_state *state = info->state;*/
+        volatile struct smc_regs *smcp;
+        volatile struct scc_regs *sccp;
+        volatile struct smc_uart_pram   *up;
+        volatile struct uart_pram           *scup;
+
+
+        local_irq_save(flags);
+
+        if (info->flags & ASYNC_INITIALIZED) {
+                goto errout;
+        }
+
+#ifdef maybe
+        if (!state->port || !state->type) {
+                if (info->port.tty)
+                        set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+                goto errout;
+        }
+#endif
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("starting up ttys%d (irq %d)...", info->line, state->irq);
+#endif
+
+
+#ifdef modem_control
+        info->MCR = 0;
+        if (info->port.tty->termios->c_cflag & CBAUD)
+                info->MCR = UART_MCR_DTR | UART_MCR_RTS;
+#endif
+        
+        if (info->port.tty)
+                clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        /*
+         * and set the speed of the serial port
+         */
+        change_speed(info);
+
+        idx = PORT_NUM(info->state->smc_scc_num);
+        if (info->state->smc_scc_num & NUM_IS_SCC) {
+                sccp = &pquicc->scc_regs[idx];
+                scup = &pquicc->pram[info->state->port].scc.pscc.u;
+
+                scup->mrblr = RX_BUF_SIZE;
+                scup->max_idl = RX_BUF_SIZE;
+
+                sccp->scc_sccm |= (UART_SCCM_TX | UART_SCCM_RX);
+                sccp->scc_gsmr.w.low |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+        } else {
+                smcp = &pquicc->smc_regs[idx];
+
+                /* Enable interrupts and I/O.
+                */
+                smcp->smc_smcm |= (SMCM_RX | SMCM_TX);
+                smcp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN);
+
+                /* We can tune the buffer length and idle characters
+                 * to take advantage of the entire incoming buffer size.
+                 * If mrblr is something other than 1, maxidl has to be
+                 * non-zero or we never get an interrupt.  The maxidl
+                 * is the number of character times we wait after reception
+                 * of the last character before we decide no more characters
+                 * are coming.
+                 */
+                /* up = (smc_uart_t *)&pquicc->cp_dparam[state->port]; */
+                /* holy unionized structures, Batman: */
+                up = &pquicc->pram[info->state->port].scc.pothers.idma_smc.psmc.u;
+
+                up->mrblr = RX_BUF_SIZE;
+                up->max_idl = RX_BUF_SIZE;
+
+                up->brkcr = 1;  /* number of break chars */
+        }
+
+        info->flags |= ASYNC_INITIALIZED;
+        local_irq_restore(flags);
+        return 0;
+        
+errout:
+        local_irq_restore(flags);
+        return retval;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void shutdown(ser_info_t *info)
+{
+        unsigned long   flags;
+        struct serial_state *state;
+        int             idx;
+        volatile struct smc_regs        *smcp;
+        volatile struct scc_regs        *sccp;
+
+        if (!(info->flags & ASYNC_INITIALIZED))
+                return;
+
+        state = info->state;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("Shutting down serial port %d (irq %d)....", info->line,
+               state->irq);
+#endif
+        
+        local_irq_save(flags);
+
+        idx = PORT_NUM(state->smc_scc_num);
+        if (state->smc_scc_num & NUM_IS_SCC) {
+                sccp = &pquicc->scc_regs[idx];
+                sccp->scc_gsmr.w.low &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+#ifdef CONFIG_SERIAL_CONSOLE
+                /* We can't disable the transmitter if this is the
+                 * system console.
+                 */
+                if ((state - rs_table) != CONFIG_SERIAL_CONSOLE_PORT)
+#endif
+                sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
+        } else {
+                smcp = &pquicc->smc_regs[idx];
+
+                /* Disable interrupts and I/O.
+                 */
+                smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX);
+#ifdef CONFIG_SERIAL_CONSOLE
+                /* We can't disable the transmitter if this is the
+                 * system console.
+                 */
+                if ((state - rs_table) != CONFIG_SERIAL_CONSOLE_PORT)
+#endif
+                        smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
+        }
+        
+        if (info->port.tty)
+                set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->flags &= ~ASYNC_INITIALIZED;
+        local_irq_restore(flags);
+}
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(ser_info_t *info)
+{
+        int     baud_rate;
+        unsigned cflag, cval, scval, prev_mode;
+        int     i, bits, sbits, idx;
+        unsigned long   flags;
+        struct serial_state *state;
+        volatile struct smc_regs        *smcp;
+        volatile struct scc_regs        *sccp;
+
+        if (!info->port.tty || !info->port.tty->termios)
+                return;
+        cflag = info->port.tty->termios->c_cflag;
+
+        state = info->state;
+
+        /* Character length programmed into the mode register is the
+         * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
+         * 1 or 2 stop bits, minus 1.
+         * The value 'bits' counts this for us.
+         */
+        cval = 0;
+        scval = 0;
+
+        /* byte size and parity */
+        switch (cflag & CSIZE) {
+              case CS5: bits = 5; break;
+              case CS6: bits = 6; break;
+              case CS7: bits = 7; break;
+              case CS8: bits = 8; break;
+              /* Never happens, but GCC is too dumb to figure it out */
+              default:  bits = 8; break;
+        }
+        sbits = bits - 5;
+
+        if (cflag & CSTOPB) {
+                cval |= SMCMR_SL;       /* Two stops */
+                scval |= SCU_PMSR_SL;
+                bits++;
+        }
+        if (cflag & PARENB) {
+                cval |= SMCMR_PEN;
+                scval |= SCU_PMSR_PEN;
+                bits++;
+        }
+        if (!(cflag & PARODD)) {
+                cval |= SMCMR_PM_EVEN;
+                scval |= (SCU_PMSR_REVP | SCU_PMSR_TEVP);
+        }
+
+        /* Determine divisor based on baud rate */
+        i = cflag & CBAUD;
+        if (i >= (sizeof(baud_table)/sizeof(int)))
+                baud_rate = 9600;
+        else
+                baud_rate = baud_table[i];
+
+        info->timeout = (TX_BUF_SIZE*HZ*bits);
+        info->timeout += HZ/50;         /* Add .02 seconds of slop */
+
+#ifdef modem_control
+        /* CTS flow control flag and modem status interrupts */
+        info->IER &= ~UART_IER_MSI;
+        if (info->flags & ASYNC_HARDPPS_CD)
+                info->IER |= UART_IER_MSI;
+        if (cflag & CRTSCTS) {
+                info->flags |= ASYNC_CTS_FLOW;
+                info->IER |= UART_IER_MSI;
+        } else
+                info->flags &= ~ASYNC_CTS_FLOW;
+        if (cflag & CLOCAL)
+                info->flags &= ~ASYNC_CHECK_CD;
+        else {
+                info->flags |= ASYNC_CHECK_CD;
+                info->IER |= UART_IER_MSI;
+        }
+        serial_out(info, UART_IER, info->IER);
+#endif
+
+        /*
+         * Set up parity check flag
+         */
+        info->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
+        if (I_INPCK(info->port.tty))
+                info->read_status_mask |= BD_SC_FR | BD_SC_PR;
+        if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
+                info->read_status_mask |= BD_SC_BR;
+        
+        /*
+         * Characters to ignore
+         */
+        info->ignore_status_mask = 0;
+        if (I_IGNPAR(info->port.tty))
+                info->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
+        if (I_IGNBRK(info->port.tty)) {
+                info->ignore_status_mask |= BD_SC_BR;
+                /*
+                 * If we're ignore parity and break indicators, ignore 
+                 * overruns too.  (For real raw support).
+                 */
+                if (I_IGNPAR(info->port.tty))
+                        info->ignore_status_mask |= BD_SC_OV;
+        }
+        /*
+         * !!! ignore all characters if CREAD is not set
+         */
+        if ((cflag & CREAD) == 0)
+         info->read_status_mask &= ~BD_SC_EMPTY;
+         local_irq_save(flags);
+
+         /* Start bit has not been added (so don't, because we would just
+          * subtract it later), and we need to add one for the number of
+          * stops bits (there is always at least one).
+          */
+         bits++;
+         idx = PORT_NUM(state->smc_scc_num);
+         if (state->smc_scc_num & NUM_IS_SCC) {
+         sccp = &pquicc->scc_regs[idx];
+         sccp->scc_psmr = (sbits << 12) | scval;
+     } else {
+         smcp = &pquicc->smc_regs[idx];
+
+                /* Set the mode register.  We want to keep a copy of the
+                 * enables, because we want to put them back if they were
+                 * present.
+                 */
+                prev_mode = smcp->smc_smcmr;
+                smcp->smc_smcmr = smcr_mk_clen(bits) | cval |  SMCMR_SM_UART;
+                smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN));
+        }
+
+        m360_cpm_setbrg((state - rs_table), baud_rate);
+
+        local_irq_restore(flags);
+}
+
+static void rs_360_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        volatile QUICC_BD       *bdp;
+
+        if (serial_paranoia_check(info, tty->name, "rs_put_char"))
+                return 0;
+
+        if (!tty)
+                return 0;
+
+        bdp = info->tx_cur;
+        while (bdp->status & BD_SC_READY);
+
+        /* *((char *)__va(bdp->buf)) = ch; */
+        *((char *)bdp->buf) = ch;
+        bdp->length = 1;
+        bdp->status |= BD_SC_READY;
+
+        /* Get next BD.
+        */
+        if (bdp->status & BD_SC_WRAP)
+                bdp = info->tx_bd_base;
+        else
+                bdp++;
+
+        info->tx_cur = (QUICC_BD *)bdp;
+        return 1;
+
+}
+
+static int rs_360_write(struct tty_struct * tty,
+                    const unsigned char *buf, int count)
+{
+        int     c, ret = 0;
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        volatile QUICC_BD *bdp;
+
+#ifdef CONFIG_KGDB
+        /* Try to let stub handle output. Returns true if it did. */ 
+        if (kgdb_output_string(buf, count))
+                return ret;
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "rs_write"))
+                return 0;
+
+        if (!tty) 
+                return 0;
+
+        bdp = info->tx_cur;
+
+        while (1) {
+                c = min(count, TX_BUF_SIZE);
+
+                if (c <= 0)
+                        break;
+
+                if (bdp->status & BD_SC_READY) {
+                        info->flags |= TX_WAKEUP;
+                        break;
+                }
+
+                /* memcpy(__va(bdp->buf), buf, c); */
+                memcpy((void *)bdp->buf, buf, c);
+
+                bdp->length = c;
+                bdp->status |= BD_SC_READY;
+
+                buf += c;
+                count -= c;
+                ret += c;
+
+                /* Get next BD.
+                */
+                if (bdp->status & BD_SC_WRAP)
+                        bdp = info->tx_bd_base;
+                else
+                        bdp++;
+                info->tx_cur = (QUICC_BD *)bdp;
+        }
+        return ret;
+}
+
+static int rs_360_write_room(struct tty_struct *tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        int     ret;
+
+        if (serial_paranoia_check(info, tty->name, "rs_write_room"))
+                return 0;
+
+        if ((info->tx_cur->status & BD_SC_READY) == 0) {
+                info->flags &= ~TX_WAKEUP;
+                ret = TX_BUF_SIZE;
+        }
+        else {
+                info->flags |= TX_WAKEUP;
+                ret = 0;
+        }
+        return ret;
+}
+
+/* I could track this with transmit counters....maybe later.
+*/
+static int rs_360_chars_in_buffer(struct tty_struct *tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+                                
+        if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
+                return 0;
+        return 0;
+}
+
+static void rs_360_flush_buffer(struct tty_struct *tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+                                
+        if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
+                return;
+
+        /* There is nothing to "flush", whatever we gave the CPM
+         * is on its way out.
+         */
+        tty_wakeup(tty);
+        info->flags &= ~TX_WAKEUP;
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void rs_360_send_xchar(struct tty_struct *tty, char ch)
+{
+        volatile QUICC_BD       *bdp;
+
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+
+        if (serial_paranoia_check(info, tty->name, "rs_send_char"))
+                return;
+
+        bdp = info->tx_cur;
+        while (bdp->status & BD_SC_READY);
+
+        /* *((char *)__va(bdp->buf)) = ch; */
+        *((char *)bdp->buf) = ch;
+        bdp->length = 1;
+        bdp->status |= BD_SC_READY;
+
+        /* Get next BD.
+        */
+        if (bdp->status & BD_SC_WRAP)
+                bdp = info->tx_bd_base;
+        else
+                bdp++;
+
+        info->tx_cur = (QUICC_BD *)bdp;
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ * 
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_360_throttle(struct tty_struct * tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+        char    buf[64];
+        
+        printk("throttle %s: %d....\n", _tty_name(tty, buf),
+               tty->ldisc.chars_in_buffer(tty));
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "rs_throttle"))
+                return;
+        
+        if (I_IXOFF(tty))
+                rs_360_send_xchar(tty, STOP_CHAR(tty));
+
+#ifdef modem_control
+        if (tty->termios->c_cflag & CRTSCTS)
+                info->MCR &= ~UART_MCR_RTS;
+
+        local_irq_disable();
+        serial_out(info, UART_MCR, info->MCR);
+        local_irq_enable();
+#endif
+}
+
+static void rs_360_unthrottle(struct tty_struct * tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+        char    buf[64];
+        
+        printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
+               tty->ldisc.chars_in_buffer(tty));
+#endif
+
+        if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
+                return;
+        
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        rs_360_send_xchar(tty, START_CHAR(tty));
+        }
+#ifdef modem_control
+        if (tty->termios->c_cflag & CRTSCTS)
+                info->MCR |= UART_MCR_RTS;
+        local_irq_disable();
+        serial_out(info, UART_MCR, info->MCR);
+        local_irq_enable();
+#endif
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+#ifdef maybe
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space. 
+ */
+static int get_lsr_info(struct async_struct * info, unsigned int *value)
+{
+        unsigned char status;
+        unsigned int result;
+
+        local_irq_disable();
+        status = serial_in(info, UART_LSR);
+        local_irq_enable();
+        result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
+        return put_user(result,value);
+}
+#endif
+
+static int rs_360_tiocmget(struct tty_struct *tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        unsigned int result = 0;
+#ifdef modem_control
+        unsigned char control, status;
+
+        if (serial_paranoia_check(info, tty->name, __func__))
+                return -ENODEV;
+
+        if (tty->flags & (1 << TTY_IO_ERROR))
+                return -EIO;
+
+        control = info->MCR;
+        local_irq_disable();
+        status = serial_in(info, UART_MSR);
+        local_irq_enable();
+        result =  ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
+                | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
+#ifdef TIOCM_OUT1
+                | ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
+                | ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
+#endif
+                | ((status  & UART_MSR_DCD) ? TIOCM_CAR : 0)
+                | ((status  & UART_MSR_RI) ? TIOCM_RNG : 0)
+                | ((status  & UART_MSR_DSR) ? TIOCM_DSR : 0)
+                | ((status  & UART_MSR_CTS) ? TIOCM_CTS : 0);
+#endif
+        return result;
+}
+
+static int rs_360_tiocmset(struct tty_struct *tty,
+                           unsigned int set, unsigned int clear)
+{
+#ifdef modem_control
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        unsigned int arg;
+
+        if (serial_paranoia_check(info, tty->name, __func__))
+                return -ENODEV;
+
+        if (tty->flags & (1 << TTY_IO_ERROR))
+                return -EIO;
+        /* FIXME: locking on info->mcr */
+        if (set & TIOCM_RTS)
+                info->mcr |= UART_MCR_RTS;
+        if (set & TIOCM_DTR)
+                info->mcr |= UART_MCR_DTR;
+        if (clear & TIOCM_RTS)
+                info->MCR &= ~UART_MCR_RTS;
+        if (clear & TIOCM_DTR)
+                info->MCR &= ~UART_MCR_DTR;
+
+#ifdef TIOCM_OUT1
+        if (set & TIOCM_OUT1)
+                info->MCR |= UART_MCR_OUT1;
+        if (set & TIOCM_OUT2)
+                info->MCR |= UART_MCR_OUT2;
+        if (clear & TIOCM_OUT1)
+                info->MCR &= ~UART_MCR_OUT1;
+        if (clear & TIOCM_OUT2)
+                info->MCR &= ~UART_MCR_OUT2;
+#endif
+
+        local_irq_disable();
+        serial_out(info, UART_MCR, info->MCR);
+        local_irq_enable();
+#endif
+        return 0;
+}
+
+/* Sending a break is a two step process on the SMC/SCC.  It is accomplished
+ * by sending a STOP TRANSMIT command followed by a RESTART TRANSMIT
+ * command.  We take advantage of the begin/end functions to make this
+ * happen.
+ */
+static ushort   smc_chan_map[] = {
+        CPM_CR_CH_SMC1,
+        CPM_CR_CH_SMC2
+};
+
+static ushort   scc_chan_map[] = {
+        CPM_CR_CH_SCC1,
+        CPM_CR_CH_SCC2,
+        CPM_CR_CH_SCC3,
+        CPM_CR_CH_SCC4
+};
+
+static void begin_break(ser_info_t *info)
+{
+        volatile QUICC *cp;
+        ushort  chan;
+        int     idx;
+
+        cp = pquicc;
+
+        idx = PORT_NUM(info->state->smc_scc_num);
+        if (info->state->smc_scc_num & NUM_IS_SCC)
+                chan = scc_chan_map[idx];
+        else
+                chan = smc_chan_map[idx];
+
+        cp->cp_cr = mk_cr_cmd(chan, CPM_CR_STOP_TX) | CPM_CR_FLG;
+        while (cp->cp_cr & CPM_CR_FLG);
+}
+
+static void end_break(ser_info_t *info)
+{
+        volatile QUICC *cp;
+        ushort  chan;
+        int idx;
+
+        cp = pquicc;
+
+        idx = PORT_NUM(info->state->smc_scc_num);
+        if (info->state->smc_scc_num & NUM_IS_SCC)
+                chan = scc_chan_map[idx];
+        else
+                chan = smc_chan_map[idx];
+
+        cp->cp_cr = mk_cr_cmd(chan, CPM_CR_RESTART_TX) | CPM_CR_FLG;
+        while (cp->cp_cr & CPM_CR_FLG);
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break(ser_info_t *info, unsigned int duration)
+{
+#ifdef SERIAL_DEBUG_SEND_BREAK
+        printk("rs_send_break(%d) jiff=%lu...", duration, jiffies);
+#endif
+        begin_break(info);
+        msleep_interruptible(duration);
+        end_break(info);
+#ifdef SERIAL_DEBUG_SEND_BREAK
+        printk("done jiffies=%lu\n", jiffies);
+#endif
+}
+
+
+/*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ *     RI where only 0->1 is counted.
+ */
+static int rs_360_get_icount(struct tty_struct *tty,
+                                struct serial_icounter_struct *icount)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        struct async_icount cnow;
+
+        local_irq_disable();
+        cnow = info->state->icount;
+        local_irq_enable();
+
+        icount->cts = cnow.cts;
+        icount->dsr = cnow.dsr;
+        icount->rng = cnow.rng;
+        icount->dcd = cnow.dcd;
+
+        return 0;
+}
+
+static int rs_360_ioctl(struct tty_struct *tty,
+                    unsigned int cmd, unsigned long arg)
+{
+        int error;
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        int retval;
+        struct async_icount cnow; 
+        /* struct async_icount_24 cnow;*/       /* kernel counter temps */
+        struct serial_icounter_struct *p_cuser; /* user space */
+
+        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
+                return -ENODEV;
+
+        if (cmd != TIOCMIWAIT) {
+                if (tty->flags & (1 << TTY_IO_ERROR))
+                    return -EIO;
+        }
+        
+        switch (cmd) {
+                case TCSBRK:    /* SVID version: non-zero arg --> no break */
+                        retval = tty_check_change(tty);
+                        if (retval)
+                                return retval;
+                        tty_wait_until_sent(tty, 0);
+                        if (signal_pending(current))
+                                return -EINTR;
+                        if (!arg) {
+                                send_break(info, 250);  /* 1/4 second */
+                                if (signal_pending(current))
+                                        return -EINTR;
+                        }
+                        return 0;
+                case TCSBRKP:   /* support for POSIX tcsendbreak() */
+                        retval = tty_check_change(tty);
+                        if (retval)
+                                return retval;
+                        tty_wait_until_sent(tty, 0);
+                        if (signal_pending(current))
+                                return -EINTR;
+                        send_break(info, arg ? arg*100 : 250);
+                        if (signal_pending(current))
+                                return -EINTR;
+                        return 0;
+                case TIOCSBRK:
+                        retval = tty_check_change(tty);
+                        if (retval)
+                                return retval;
+                        tty_wait_until_sent(tty, 0);
+                        begin_break(info);
+                        return 0;
+                case TIOCCBRK:
+                        retval = tty_check_change(tty);
+                        if (retval)
+                                return retval;
+                        end_break(info);
+                        return 0;
+#ifdef maybe
+                case TIOCSERGETLSR: /* Get line status register */
+                        return get_lsr_info(info, (unsigned int *) arg);
+#endif
+                /*
+                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+                 * - mask passed in arg for lines of interest
+                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+                 * Caller should use TIOCGICOUNT to see which one it was
+                 */
+                 case TIOCMIWAIT:
+#ifdef modem_control
+                        local_irq_disable();
+                        /* note the counters on entry */
+                        cprev = info->state->icount;
+                        local_irq_enable();
+                        while (1) {
+                                interruptible_sleep_on(&info->delta_msr_wait);
+                                /* see if a signal did it */
+                                if (signal_pending(current))
+                                        return -ERESTARTSYS;
+                                local_irq_disable();
+                                cnow = info->state->icount; /* atomic copy */
+                                local_irq_enable();
+                                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
+                                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
+                                        return -EIO; /* no change => error */
+                                if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
+                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
+                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
+                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
+                                        return 0;
+                                }
+                                cprev = cnow;
+                        }
+                        /* NOTREACHED */
+#else
+                        return 0;
+#endif
+
+
+                default:
+                        return -ENOIOCTLCMD;
+                }
+        return 0;
+}
+
+/* FIX UP modem control here someday......
+*/
+static void rs_360_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+
+        change_speed(info);
+
+#ifdef modem_control
+        /* Handle transition to B0 status */
+        if ((old_termios->c_cflag & CBAUD) &&
+            !(tty->termios->c_cflag & CBAUD)) {
+                info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
+                local_irq_disable();
+                serial_out(info, UART_MCR, info->MCR);
+                local_irq_enable();
+        }
+        
+        /* Handle transition away from B0 status */
+        if (!(old_termios->c_cflag & CBAUD) &&
+            (tty->termios->c_cflag & CBAUD)) {
+                info->MCR |= UART_MCR_DTR;
+                if (!tty->hw_stopped ||
+                    !(tty->termios->c_cflag & CRTSCTS)) {
+                        info->MCR |= UART_MCR_RTS;
+                }
+                local_irq_disable();
+                serial_out(info, UART_MCR, info->MCR);
+                local_irq_enable();
+        }
+        
+        /* Handle turning off CRTSCTS */
+        if ((old_termios->c_cflag & CRTSCTS) &&
+            !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                rs_360_start(tty);
+        }
+#endif
+
+#if 0
+        /*
+         * No need to wake up processes in open wait, since they
+         * sample the CLOCAL flag once, and don't recheck it.
+         * XXX  It's not clear whether the current behavior is correct
+         * or not.  Hence, this may change.....
+         */
+        if (!(old_termios->c_cflag & CLOCAL) &&
+            (tty->termios->c_cflag & CLOCAL))
+                wake_up_interruptible(&info->open_wait);
+#endif
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ * 
+ * This routine is called when the serial port gets closed.  First, we
+ * wait for the last remaining data to be sent.  Then, we unlink its
+ * async structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void rs_360_close(struct tty_struct *tty, struct file * filp)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        /* struct async_state *state; */
+        struct serial_state *state;
+        unsigned long   flags;
+        int             idx;
+        volatile struct smc_regs        *smcp;
+        volatile struct scc_regs        *sccp;
+
+        if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
+                return;
+
+        state = info->state;
+        
+        local_irq_save(flags);
+        
+        if (tty_hung_up_p(filp)) {
+                DBG_CNT("before DEC-hung");
+                local_irq_restore(flags);
+                return;
+        }
+        
+#ifdef SERIAL_DEBUG_OPEN
+        printk("rs_close ttys%d, count = %d\n", info->line, state->count);
+#endif
+        if ((tty->count == 1) && (state->count != 1)) {
+                /*
+                 * Uh, oh.  tty->count is 1, which means that the tty
+                 * structure will be freed.  state->count should always
+                 * be one in these conditions.  If it's greater than
+                 * one, we've got real problems, since it means the
+                 * serial port won't be shutdown.
+                 */
+                printk("rs_close: bad serial port count; tty->count is 1, "
+                       "state->count is %d\n", state->count);
+                state->count = 1;
+        }
+        if (--state->count < 0) {
+                printk("rs_close: bad serial port count for ttys%d: %d\n",
+                       info->line, state->count);
+                state->count = 0;
+        }
+        if (state->count) {
+                DBG_CNT("before DEC-2");
+                local_irq_restore(flags);
+                return;
+        }
+        info->flags |= ASYNC_CLOSING;
+        /*
+         * Now we wait for the transmit buffer to clear; and we notify 
+         * the line discipline to only process XON/XOFF characters.
+         */
+        tty->closing = 1;
+        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+                tty_wait_until_sent(tty, info->closing_wait);
+        /*
+         * At this point we stop accepting input.  To do this, we
+         * disable the receive line status interrupts, and tell the
+         * interrupt driver to stop checking the data ready bit in the
+         * line status register.
+         */
+        info->read_status_mask &= ~BD_SC_EMPTY;
+        if (info->flags & ASYNC_INITIALIZED) {
+
+                idx = PORT_NUM(info->state->smc_scc_num);
+                if (info->state->smc_scc_num & NUM_IS_SCC) {
+                        sccp = &pquicc->scc_regs[idx];
+                        sccp->scc_sccm &= ~UART_SCCM_RX;
+                        sccp->scc_gsmr.w.low &= ~SCC_GSMRL_ENR;
+                } else {
+                        smcp = &pquicc->smc_regs[idx];
+                        smcp->smc_smcm &= ~SMCM_RX;
+                        smcp->smc_smcmr &= ~SMCMR_REN;
+                }
+                /*
+                 * Before we drop DTR, make sure the UART transmitter
+                 * has completely drained; this is especially
+                 * important if there is a transmit FIFO!
+                 */
+                rs_360_wait_until_sent(tty, info->timeout);
+        }
+        shutdown(info);
+        rs_360_flush_buffer(tty);
+        tty_ldisc_flush(tty);           
+        tty->closing = 0;
+        info->event = 0;
+        info->port.tty = NULL;
+        if (info->blocked_open) {
+                if (info->close_delay) {
+                        msleep_interruptible(jiffies_to_msecs(info->close_delay));
+                }
+                wake_up_interruptible(&info->open_wait);
+        }
+        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+        wake_up_interruptible(&info->close_wait);
+        local_irq_restore(flags);
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_360_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        unsigned long orig_jiffies, char_time;
+        /*int lsr;*/
+        volatile QUICC_BD *bdp;
+        
+        if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
+                return;
+
+#ifdef maybe
+        if (info->state->type == PORT_UNKNOWN)
+                return;
+#endif
+
+        orig_jiffies = jiffies;
+        /*
+         * Set the check interval to be 1/5 of the estimated time to
+         * send a single character, and make it at least 1.  The check
+         * interval should also be less than the timeout.
+         * 
+         * Note: we have to use pretty tight timings here to satisfy
+         * the NIST-PCTS.
+         */
+        char_time = 1;
+        if (timeout)
+                char_time = min(char_time, (unsigned long)timeout);
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+        printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
+        printk("jiff=%lu...", jiffies);
+#endif
+
+        /* We go through the loop at least once because we can't tell
+         * exactly when the last character exits the shifter.  There can
+         * be at least two characters waiting to be sent after the buffers
+         * are empty.
+         */
+        do {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+                printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
+#endif
+/*              current->counter = 0;    make us low-priority */
+                msleep_interruptible(jiffies_to_msecs(char_time));
+                if (signal_pending(current))
+                        break;
+                if (timeout && (time_after(jiffies, orig_jiffies + timeout)))
+                        break;
+                /* The 'tx_cur' is really the next buffer to send.  We
+                 * have to back up to the previous BD and wait for it
+                 * to go.  This isn't perfect, because all this indicates
+                 * is the buffer is available.  There are still characters
+                 * in the CPM FIFO.
+                 */
+                bdp = info->tx_cur;
+                if (bdp == info->tx_bd_base)
+                        bdp += (TX_NUM_FIFO-1);
+                else
+                        bdp--;
+        } while (bdp->status & BD_SC_READY);
+        current->state = TASK_RUNNING;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+        printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
+#endif
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void rs_360_hangup(struct tty_struct *tty)
+{
+        ser_info_t *info = (ser_info_t *)tty->driver_data;
+        struct serial_state *state = info->state;
+        
+        if (serial_paranoia_check(info, tty->name, "rs_hangup"))
+                return;
+
+        state = info->state;
+        
+        rs_360_flush_buffer(tty);
+        shutdown(info);
+        info->event = 0;
+        state->count = 0;
+        info->flags &= ~ASYNC_NORMAL_ACTIVE;
+        info->port.tty = NULL;
+        wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+                           ser_info_t *info)
+{
+#ifdef DO_THIS_LATER
+        DECLARE_WAITQUEUE(wait, current);
+#endif
+        struct serial_state *state = info->state;
+        int             retval;
+        int             do_clocal = 0;
+
+        /*
+         * If the device is in the middle of being closed, then block
+         * until it's done, and then try again.
+         */
+        if (tty_hung_up_p(filp) ||
+            (info->flags & ASYNC_CLOSING)) {
+                if (info->flags & ASYNC_CLOSING)
+                        interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+                if (info->flags & ASYNC_HUP_NOTIFY)
+                        return -EAGAIN;
+                else
+                        return -ERESTARTSYS;
+#else
+                return -EAGAIN;
+#endif
+        }
+
+        /*
+         * If non-blocking mode is set, or the port is not enabled,
+         * then make the check up front and then exit.
+         * If this is an SMC port, we don't have modem control to wait
+         * for, so just get out here.
+         */
+        if ((filp->f_flags & O_NONBLOCK) ||
+            (tty->flags & (1 << TTY_IO_ERROR)) ||
+            !(info->state->smc_scc_num & NUM_IS_SCC)) {
+                info->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (tty->termios->c_cflag & CLOCAL)
+                do_clocal = 1;
+        
+        /*
+         * Block waiting for the carrier detect and the line to become
+         * free (i.e., not in use by the callout).  While we are in
+         * this loop, state->count is dropped by one, so that
+         * rs_close() knows when to free things.  We restore it upon
+         * exit, either normal or abnormal.
+         */
+        retval = 0;
+#ifdef DO_THIS_LATER
+        add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+        printk("block_til_ready before block: ttys%d, count = %d\n",
+               state->line, state->count);
+#endif
+        local_irq_disable();
+        if (!tty_hung_up_p(filp)) 
+                state->count--;
+        local_irq_enable();
+        info->blocked_open++;
+        while (1) {
+                local_irq_disable();
+                if (tty->termios->c_cflag & CBAUD)
+                        serial_out(info, UART_MCR,
+                                   serial_inp(info, UART_MCR) |
+                                   (UART_MCR_DTR | UART_MCR_RTS));
+                local_irq_enable();
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (tty_hung_up_p(filp) ||
+                    !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+                        if (info->flags & ASYNC_HUP_NOTIFY)
+                                retval = -EAGAIN;
+                        else
+                                retval = -ERESTARTSYS;  
+#else
+                        retval = -EAGAIN;
+#endif
+                        break;
+                }
+                if (!(info->flags & ASYNC_CLOSING) &&
+                    (do_clocal || (serial_in(info, UART_MSR) &
+                                   UART_MSR_DCD)))
+                        break;
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+#ifdef SERIAL_DEBUG_OPEN
+                printk("block_til_ready blocking: ttys%d, count = %d\n",
+                       info->line, state->count);
+#endif
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+        current->state = TASK_RUNNING;
+        remove_wait_queue(&info->open_wait, &wait);
+        if (!tty_hung_up_p(filp))
+                state->count++;
+        info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+        printk("block_til_ready after blocking: ttys%d, count = %d\n",
+               info->line, state->count);
+#endif
+#endif /* DO_THIS_LATER */
+        if (retval)
+                return retval;
+        info->flags |= ASYNC_NORMAL_ACTIVE;
+        return 0;
+}
+
+static int get_async_struct(int line, ser_info_t **ret_info)
+{
+        struct serial_state *sstate;
+
+        sstate = rs_table + line;
+        if (sstate->info) {
+                sstate->count++;
+                *ret_info = (ser_info_t *)sstate->info;
+                return 0;
+        }
+        else {
+                return -ENOMEM;
+        }
+}
+
+/*
+ * This routine is called whenever a serial port is opened.  It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain.   It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int rs_360_open(struct tty_struct *tty, struct file * filp)
+{
+        ser_info_t      *info;
+        int             retval, line;
+
+        line = tty->index;
+        if ((line < 0) || (line >= NR_PORTS))
+                return -ENODEV;
+        retval = get_async_struct(line, &info);
+        if (retval)
+                return retval;
+        if (serial_paranoia_check(info, tty->name, "rs_open"))
+                return -ENODEV;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("rs_open %s, count = %d\n", tty->name, info->state->count);
+#endif
+        tty->driver_data = info;
+        info->port.tty = tty;
+
+        /*
+         * Start up serial port
+         */
+        retval = startup(info);
+        if (retval)
+                return retval;
+
+        retval = block_til_ready(tty, filp, info);
+        if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+                printk("rs_open returning after block_til_ready with %d\n",
+                       retval);
+#endif
+                return retval;
+        }
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("rs_open %s successful...", tty->name);
+#endif
+        return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline int line_info(char *buf, struct serial_state *state)
+{
+#ifdef notdef
+        struct async_struct *info = state->info, scr_info;
+        char    stat_buf[30], control, status;
+#endif
+        int     ret;
+
+        ret = sprintf(buf, "%d: uart:%s port:%X irq:%d",
+                      state->line,
+                      (state->smc_scc_num & NUM_IS_SCC) ? "SCC" : "SMC",
+                      (unsigned int)(state->port), state->irq);
+
+        if (!state->port || (state->type == PORT_UNKNOWN)) {
+                ret += sprintf(buf+ret, "\n");
+                return ret;
+        }
+
+#ifdef notdef
+        /*
+         * Figure out the current RS-232 lines
+         */
+        if (!info) {
+                info = &scr_info;       /* This is just for serial_{in,out} */
+
+                info->magic = SERIAL_MAGIC;
+                info->port = state->port;
+                info->flags = state->flags;
+                info->quot = 0;
+                info->port.tty = NULL;
+        }
+        local_irq_disable();
+        status = serial_in(info, UART_MSR);
+        control = info ? info->MCR : serial_in(info, UART_MCR);
+        local_irq_enable();
+        
+        stat_buf[0] = 0;
+        stat_buf[1] = 0;
+        if (control & UART_MCR_RTS)
+                strcat(stat_buf, "|RTS");
+        if (status & UART_MSR_CTS)
+                strcat(stat_buf, "|CTS");
+        if (control & UART_MCR_DTR)
+                strcat(stat_buf, "|DTR");
+        if (status & UART_MSR_DSR)
+                strcat(stat_buf, "|DSR");
+        if (status & UART_MSR_DCD)
+                strcat(stat_buf, "|CD");
+        if (status & UART_MSR_RI)
+                strcat(stat_buf, "|RI");
+
+        if (info->quot) {
+                ret += sprintf(buf+ret, " baud:%d",
+                               state->baud_base / info->quot);
+        }
+
+        ret += sprintf(buf+ret, " tx:%d rx:%d",
+                      state->icount.tx, state->icount.rx);
+
+        if (state->icount.frame)
+                ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
+        
+        if (state->icount.parity)
+                ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
+        
+        if (state->icount.brk)
+                ret += sprintf(buf+ret, " brk:%d", state->icount.brk);  
+
+        if (state->icount.overrun)
+                ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
+
+        /*
+         * Last thing is the RS-232 status lines
+         */
+        ret += sprintf(buf+ret, " %s\n", stat_buf+1);
+#endif
+        return ret;
+}
+
+int rs_360_read_proc(char *page, char **start, off_t off, int count,
+                 int *eof, void *data)
+{
+        int i, len = 0;
+        off_t   begin = 0;
+
+        len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
+        for (i = 0; i < NR_PORTS && len < 4000; i++) {
+                len += line_info(page + len, &rs_table[i]);
+                if (len+begin > off+count)
+                        goto done;
+                if (len+begin < off) {
+                        begin += len;
+                        len = 0;
+                }
+        }
+        *eof = 1;
+done:
+        if (off >= len+begin)
+                return 0;
+        *start = page + (begin-off);
+        return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/*
+ * ---------------------------------------------------------------------
+ * rs_init() and friends
+ *
+ * rs_init() is called at boot-time to initialize the serial driver.
+ * ---------------------------------------------------------------------
+ */
+
+/*
+ * This routine prints out the appropriate serial driver version
+ * number, and identifies which options were configured into this
+ * driver.
+ */
+static _INLINE_ void show_serial_version(void)
+{
+        printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
+}
+
+
+/*
+ * The serial console driver used during boot.  Note that these names
+ * clash with those found in "serial.c", so we currently can't support
+ * the 16xxx uarts and these at the same time.  I will fix this to become
+ * an indirect function call from tty_io.c (or something).
+ */
+
+#ifdef CONFIG_SERIAL_CONSOLE
+
+/*
+ * Print a string to the serial port trying not to disturb any possible
+ * real use of the port...
+ */
+static void my_console_write(int idx, const char *s,
+                                unsigned count)
+{
+        struct          serial_state    *ser;
+        ser_info_t              *info;
+        unsigned                i;
+        QUICC_BD                *bdp, *bdbase;
+        volatile struct smc_uart_pram   *up;
+        volatile        u_char          *cp;
+
+        ser = rs_table + idx;
+
+
+        /* If the port has been initialized for general use, we have
+         * to use the buffer descriptors allocated there.  Otherwise,
+         * we simply use the single buffer allocated.
+         */
+        if ((info = (ser_info_t *)ser->info) != NULL) {
+                bdp = info->tx_cur;
+                bdbase = info->tx_bd_base;
+        }
+        else {
+                /* Pointer to UART in parameter ram.
+                */
+                /* up = (smc_uart_t *)&cpmp->cp_dparam[ser->port]; */
+                up = &pquicc->pram[ser->port].scc.pothers.idma_smc.psmc.u;
+
+                /* Get the address of the host memory buffer.
+                 */
+                bdp = bdbase = (QUICC_BD *)((uint)pquicc + (uint)up->tbase);
+        }
+
+        /*
+         * We need to gracefully shut down the transmitter, disable
+         * interrupts, then send our bytes out.
+         */
+
+        /*
+         * Now, do each character.  This is not as bad as it looks
+         * since this is a holding FIFO and not a transmitting FIFO.
+         * We could add the complexity of filling the entire transmit
+         * buffer, but we would just wait longer between accesses......
+         */
+        for (i = 0; i < count; i++, s++) {
+                /* Wait for transmitter fifo to empty.
+                 * Ready indicates output is ready, and xmt is doing
+                 * that, not that it is ready for us to send.
+                 */
+                while (bdp->status & BD_SC_READY);
+
+                /* Send the character out.
+                 */
+                cp = bdp->buf;
+                *cp = *s;
+                
+                bdp->length = 1;
+                bdp->status |= BD_SC_READY;
+
+                if (bdp->status & BD_SC_WRAP)
+                        bdp = bdbase;
+                else
+                        bdp++;
+
+                /* if a LF, also do CR... */
+                if (*s == 10) {
+                        while (bdp->status & BD_SC_READY);
+                        /* cp = __va(bdp->buf); */
+                        cp = bdp->buf;
+                        *cp = 13;
+                        bdp->length = 1;
+                        bdp->status |= BD_SC_READY;
+
+                        if (bdp->status & BD_SC_WRAP) {
+                                bdp = bdbase;
+                        }
+                        else {
+                                bdp++;
+                        }
+                }
+        }
+
+        /*
+         * Finally, Wait for transmitter & holding register to empty
+         *  and restore the IER
+         */
+        while (bdp->status & BD_SC_READY);
+
+        if (info)
+                info->tx_cur = (QUICC_BD *)bdp;
+}
+
+static void serial_console_write(struct console *c, const char *s,
+                                unsigned count)
+{
+#ifdef CONFIG_KGDB
+        /* Try to let stub handle output. Returns true if it did. */ 
+        if (kgdb_output_string(s, count))
+                return;
+#endif
+        my_console_write(c->index, s, count);
+}
+
+
+
+/*void console_print_68360(const char *p)
+{
+        const char *cp = p;
+        int i;
+
+        for (i=0;cp[i]!=0;i++);
+
+        serial_console_write (p, i);
+
+        //Comment this if you want to have a strict interrupt-driven output
+        //rs_fair_output();
+
+        return;
+}*/
+
+
+
+
+
+
+#ifdef CONFIG_XMON
+int
+xmon_360_write(const char *s, unsigned count)
+{
+        my_console_write(0, s, count);
+        return(count);
+}
+#endif
+
+#ifdef CONFIG_KGDB
+void
+putDebugChar(char ch)
+{
+        my_console_write(0, &ch, 1);
+}
+#endif
+
+/*
+ * Receive character from the serial port.  This only works well
+ * before the port is initialized for real use.
+ */
+static int my_console_wait_key(int idx, int xmon, char *obuf)
+{
+        struct serial_state             *ser;
+        u_char                  c, *cp;
+        ser_info_t              *info;
+        QUICC_BD                *bdp;
+        volatile struct smc_uart_pram   *up;
+        int                             i;
+
+        ser = rs_table + idx;
+
+        /* Get the address of the host memory buffer.
+         * If the port has been initialized for general use, we must
+         * use information from the port structure.
+         */
+        if ((info = (ser_info_t *)ser->info))
+                bdp = info->rx_cur;
+        else
+                /* bdp = (QUICC_BD *)&cpmp->cp_dpmem[up->smc_rbase]; */
+                bdp = (QUICC_BD *)((uint)pquicc + (uint)up->tbase);
+
+        /* Pointer to UART in parameter ram.
+         */
+        /* up = (smc_uart_t *)&cpmp->cp_dparam[ser->port]; */
+        up = &pquicc->pram[info->state->port].scc.pothers.idma_smc.psmc.u;
+
+        /*
+         * We need to gracefully shut down the receiver, disable
+         * interrupts, then read the input.
+         * XMON just wants a poll.  If no character, return -1, else
+         * return the character.
+         */
+        if (!xmon) {
+                while (bdp->status & BD_SC_EMPTY);
+        }
+        else {
+                if (bdp->status & BD_SC_EMPTY)
+                        return -1;
+        }
+
+        cp = (char *)bdp->buf;
+
+        if (obuf) {
+                i = c = bdp->length;
+                while (i-- > 0)
+                        *obuf++ = *cp++;
+        }
+        else {
+                c = *cp;
+        }
+        bdp->status |= BD_SC_EMPTY;
+
+        if (info) {
+                if (bdp->status & BD_SC_WRAP) {
+                        bdp = info->rx_bd_base;
+                }
+                else {
+                        bdp++;
+                }
+                info->rx_cur = (QUICC_BD *)bdp;
+        }
+
+        return((int)c);
+}
+
+static int serial_console_wait_key(struct console *co)
+{
+        return(my_console_wait_key(co->index, 0, NULL));
+}
+
+#ifdef CONFIG_XMON
+int
+xmon_360_read_poll(void)
+{
+        return(my_console_wait_key(0, 1, NULL));
+}
+
+int
+xmon_360_read_char(void)
+{
+        return(my_console_wait_key(0, 0, NULL));
+}
+#endif
+
+#ifdef CONFIG_KGDB
+static char kgdb_buf[RX_BUF_SIZE], *kgdp;
+static int kgdb_chars;
+
+unsigned char
+getDebugChar(void)
+{
+        if (kgdb_chars <= 0) {
+                kgdb_chars = my_console_wait_key(0, 0, kgdb_buf);
+                kgdp = kgdb_buf;
+        }
+        kgdb_chars--;
+
+        return(*kgdp++);
+}
+
+void kgdb_interruptible(int state)
+{
+}
+void kgdb_map_scc(void)
+{
+        struct          serial_state *ser;
+        uint            mem_addr;
+        volatile        QUICC_BD                *bdp;
+        volatile        smc_uart_t      *up;
+
+        cpmp = (cpm360_t *)&(((immap_t *)IMAP_ADDR)->im_cpm);
+
+        /* To avoid data cache CPM DMA coherency problems, allocate a
+         * buffer in the CPM DPRAM.  This will work until the CPM and
+         * serial ports are initialized.  At that time a memory buffer
+         * will be allocated.
+         * The port is already initialized from the boot procedure, all
+         * we do here is give it a different buffer and make it a FIFO.
+         */
+
+        ser = rs_table;
+
+        /* Right now, assume we are using SMCs.
+        */
+        up = (smc_uart_t *)&cpmp->cp_dparam[ser->port];
+
+        /* Allocate space for an input FIFO, plus a few bytes for output.
+         * Allocate bytes to maintain word alignment.
+         */
+        mem_addr = (uint)(&cpmp->cp_dpmem[0x1000]);
+
+        /* Set the physical address of the host memory buffers in
+         * the buffer descriptors.
+         */
+        bdp = (QUICC_BD *)&cpmp->cp_dpmem[up->smc_rbase];
+        bdp->buf = mem_addr;
+
+        bdp = (QUICC_BD *)&cpmp->cp_dpmem[up->smc_tbase];
+        bdp->buf = mem_addr+RX_BUF_SIZE;
+
+        up->smc_mrblr = RX_BUF_SIZE;            /* receive buffer length */
+        up->smc_maxidl = RX_BUF_SIZE;
+}
+#endif
+
+static struct tty_struct *serial_console_device(struct console *c, int *index)
+{
+        *index = c->index;
+        return serial_driver;
+}
+
+
+struct console sercons = {
+        .name           = "ttyS",
+        .write          = serial_console_write,
+        .device         = serial_console_device,
+        .wait_key       = serial_console_wait_key,
+        .setup          = serial_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = CONFIG_SERIAL_CONSOLE_PORT, 
+};
+
+
+
+/*
+ *      Register console.
+ */
+long console_360_init(long kmem_start, long kmem_end)
+{
+        register_console(&sercons);
+        /*register_console (console_print_68360); - 2.0.38 only required a write
+      function pointer. */
+        return kmem_start;
+}
+
+#endif
+
+/* Index in baud rate table of the default console baud rate.
+*/
+static  int     baud_idx;
+
+static const struct tty_operations rs_360_ops = {
+        .owner = THIS_MODULE,
+        .open = rs_360_open,
+        .close = rs_360_close,
+        .write = rs_360_write,
+        .put_char = rs_360_put_char,
+        .write_room = rs_360_write_room,
+        .chars_in_buffer = rs_360_chars_in_buffer,
+        .flush_buffer = rs_360_flush_buffer,
+        .ioctl = rs_360_ioctl,
+        .throttle = rs_360_throttle,
+        .unthrottle = rs_360_unthrottle,
+        /* .send_xchar = rs_360_send_xchar, */
+        .set_termios = rs_360_set_termios,
+        .stop = rs_360_stop,
+        .start = rs_360_start,
+        .hangup = rs_360_hangup,
+        /* .wait_until_sent = rs_360_wait_until_sent, */
+        /* .read_proc = rs_360_read_proc, */
+        .tiocmget = rs_360_tiocmget,
+        .tiocmset = rs_360_tiocmset,
+        .get_icount = rs_360_get_icount,
+};
+
+static int __init rs_360_init(void)
+{
+        struct serial_state * state;
+        ser_info_t      *info;
+        void       *mem_addr;
+        uint            dp_addr, iobits;
+        int                 i, j, idx;
+        ushort          chan;
+        QUICC_BD        *bdp;
+        volatile        QUICC           *cp;
+        volatile        struct smc_regs *sp;
+        volatile        struct smc_uart_pram    *up;
+        volatile        struct scc_regs *scp;
+        volatile        struct uart_pram        *sup;
+        /* volatile     immap_t         *immap; */
+        
+        serial_driver = alloc_tty_driver(NR_PORTS);
+        if (!serial_driver)
+                return -1;
+
+        show_serial_version();
+
+        serial_driver->name = "ttyS";
+        serial_driver->major = TTY_MAJOR;
+        serial_driver->minor_start = 64;
+        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        serial_driver->subtype = SERIAL_TYPE_NORMAL;
+        serial_driver->init_termios = tty_std_termios;
+        serial_driver->init_termios.c_cflag =
+                baud_idx | CS8 | CREAD | HUPCL | CLOCAL;
+        serial_driver->flags = TTY_DRIVER_REAL_RAW;
+        tty_set_operations(serial_driver, &rs_360_ops);
+        
+        if (tty_register_driver(serial_driver))
+                panic("Couldn't register serial driver\n");
+
+        cp = pquicc;    /* Get pointer to Communication Processor */
+        /* immap = (immap_t *)IMAP_ADDR; */     /* and to internal registers */
+
+
+        /* Configure SCC2, SCC3, and SCC4 instead of port A parallel I/O.
+         */
+        /* The "standard" configuration through the 860.
+        */
+/*      immap->im_ioport.iop_papar |= 0x00fc; */
+/*      immap->im_ioport.iop_padir &= ~0x00fc; */
+/*      immap->im_ioport.iop_paodr &= ~0x00fc; */
+        cp->pio_papar |= 0x00fc;
+        cp->pio_padir &= ~0x00fc;
+        /* cp->pio_paodr &= ~0x00fc; */
+
+
+        /* Since we don't yet do modem control, connect the port C pins
+         * as general purpose I/O.  This will assert CTS and CD for the
+         * SCC ports.
+         */
+        /* FIXME: see 360um p.7-365 and 860um p.34-12 
+         * I can't make sense of these bits - mleslie*/
+/*      immap->im_ioport.iop_pcdir |= 0x03c6; */
+/*      immap->im_ioport.iop_pcpar &= ~0x03c6; */
+
+/*      cp->pio_pcdir |= 0x03c6; */
+/*      cp->pio_pcpar &= ~0x03c6; */
+
+
+
+        /* Connect SCC2 and SCC3 to NMSI.  Connect BRG3 to SCC2 and
+         * BRG4 to SCC3.
+         */
+        cp->si_sicr &= ~0x00ffff00;
+        cp->si_sicr |=  0x001b1200;
+
+#ifdef CONFIG_PP04
+        /* Frequentis PP04 forced to RS-232 until we know better.
+         * Port C 12 and 13 low enables RS-232 on SCC3 and SCC4.
+         */
+        immap->im_ioport.iop_pcdir |= 0x000c;
+        immap->im_ioport.iop_pcpar &= ~0x000c;
+        immap->im_ioport.iop_pcdat &= ~0x000c;
+
+        /* This enables the TX driver.
+        */
+        cp->cp_pbpar &= ~0x6000;
+        cp->cp_pbdat &= ~0x6000;
+#endif
+
+        for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+                state->magic = SSTATE_MAGIC;
+                state->line = i;
+                state->type = PORT_UNKNOWN;
+                state->custom_divisor = 0;
+                state->close_delay = 5*HZ/10;
+                state->closing_wait = 30*HZ;
+                state->icount.cts = state->icount.dsr = 
+                        state->icount.rng = state->icount.dcd = 0;
+                state->icount.rx = state->icount.tx = 0;
+                state->icount.frame = state->icount.parity = 0;
+                state->icount.overrun = state->icount.brk = 0;
+                printk(KERN_INFO "ttyS%d at irq 0x%02x is an %s\n",
+                       i, (unsigned int)(state->irq),
+                       (state->smc_scc_num & NUM_IS_SCC) ? "SCC" : "SMC");
+
+#ifdef CONFIG_SERIAL_CONSOLE
+                /* If we just printed the message on the console port, and
+                 * we are about to initialize it for general use, we have
+                 * to wait a couple of character times for the CR/NL to
+                 * make it out of the transmit buffer.
+                 */
+                if (i == CONFIG_SERIAL_CONSOLE_PORT)
+                        mdelay(8);
+
+
+/*              idx = PORT_NUM(info->state->smc_scc_num); */
+/*              if (info->state->smc_scc_num & NUM_IS_SCC) */
+/*                      chan = scc_chan_map[idx]; */
+/*              else */
+/*                      chan = smc_chan_map[idx]; */
+
+/*              cp->cp_cr = mk_cr_cmd(chan, CPM_CR_STOP_TX) | CPM_CR_FLG; */
+/*              while (cp->cp_cr & CPM_CR_FLG); */
+
+#endif
+                /* info = kmalloc(sizeof(ser_info_t), GFP_KERNEL); */
+                info = &quicc_ser_info[i];
+                if (info) {
+                        memset (info, 0, sizeof(ser_info_t));
+                        info->magic = SERIAL_MAGIC;
+                        info->line = i;
+                        info->flags = state->flags;
+                        INIT_WORK(&info->tqueue, do_softint, info);
+                        INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
+                        init_waitqueue_head(&info->open_wait);
+                        init_waitqueue_head(&info->close_wait);
+                        info->state = state;
+                        state->info = (struct async_struct *)info;
+
+                        /* We need to allocate a transmit and receive buffer
+                         * descriptors from dual port ram, and a character
+                         * buffer area from host mem.
+                         */
+                        dp_addr = m360_cpm_dpalloc(sizeof(QUICC_BD) * RX_NUM_FIFO);
+
+                        /* Allocate space for FIFOs in the host memory.
+                         *  (for now this is from a static array of buffers :(
+                         */
+                        /* mem_addr = m360_cpm_hostalloc(RX_NUM_FIFO * RX_BUF_SIZE); */
+                        /* mem_addr = kmalloc (RX_NUM_FIFO * RX_BUF_SIZE, GFP_BUFFER); */
+                        mem_addr = &rx_buf_pool[i * RX_NUM_FIFO * RX_BUF_SIZE];
+
+                        /* Set the physical address of the host memory
+                         * buffers in the buffer descriptors, and the
+                         * virtual address for us to work with.
+                         */
+                        bdp = (QUICC_BD *)((uint)pquicc + dp_addr);
+                        info->rx_cur = info->rx_bd_base = bdp;
+
+                        /* initialize rx buffer descriptors */
+                        for (j=0; j<(RX_NUM_FIFO-1); j++) {
+                                bdp->buf = &rx_buf_pool[(i * RX_NUM_FIFO + j ) * RX_BUF_SIZE];
+                                bdp->status = BD_SC_EMPTY | BD_SC_INTRPT;
+                                mem_addr += RX_BUF_SIZE;
+                                bdp++;
+                        }
+                        bdp->buf = &rx_buf_pool[(i * RX_NUM_FIFO + j ) * RX_BUF_SIZE];
+                        bdp->status = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
+
+
+                        idx = PORT_NUM(info->state->smc_scc_num);
+                        if (info->state->smc_scc_num & NUM_IS_SCC) {
+
+#if defined (CONFIG_UCQUICC) && 1
+                                /* set the transceiver mode to RS232 */
+                                sipex_mode_bits &= ~(uint)SIPEX_MODE(idx,0x0f); /* clear current mode */
+                                sipex_mode_bits |= (uint)SIPEX_MODE(idx,0x02);
+                                *(uint *)_periph_base = sipex_mode_bits;
+                                /* printk ("sipex bits = 0x%08x\n", sipex_mode_bits); */
+#endif
+                        }
+
+                        dp_addr = m360_cpm_dpalloc(sizeof(QUICC_BD) * TX_NUM_FIFO);
+
+                        /* Allocate space for FIFOs in the host memory.
+                        */
+                        /* mem_addr = m360_cpm_hostalloc(TX_NUM_FIFO * TX_BUF_SIZE); */
+                        /* mem_addr = kmalloc (TX_NUM_FIFO * TX_BUF_SIZE, GFP_BUFFER); */
+                        mem_addr = &tx_buf_pool[i * TX_NUM_FIFO * TX_BUF_SIZE];
+
+                        /* Set the physical address of the host memory
+                         * buffers in the buffer descriptors, and the
+                         * virtual address for us to work with.
+                         */
+                        /* bdp = (QUICC_BD *)&cp->cp_dpmem[dp_addr]; */
+                        bdp = (QUICC_BD *)((uint)pquicc + dp_addr);
+                        info->tx_cur = info->tx_bd_base = (QUICC_BD *)bdp;
+
+                        /* initialize tx buffer descriptors */
+                        for (j=0; j<(TX_NUM_FIFO-1); j++) {
+                                bdp->buf = &tx_buf_pool[(i * TX_NUM_FIFO + j ) * TX_BUF_SIZE];
+                                bdp->status = BD_SC_INTRPT;
+                                mem_addr += TX_BUF_SIZE;
+                                bdp++;
+                        }
+                        bdp->buf = &tx_buf_pool[(i * TX_NUM_FIFO + j ) * TX_BUF_SIZE];
+                        bdp->status = (BD_SC_WRAP | BD_SC_INTRPT);
+
+                        if (info->state->smc_scc_num & NUM_IS_SCC) {
+                                scp = &pquicc->scc_regs[idx];
+                                sup = &pquicc->pram[info->state->port].scc.pscc.u;
+                                sup->rbase = dp_addr;
+                                sup->tbase = dp_addr;
+
+                                /* Set up the uart parameters in the
+                                 * parameter ram.
+                                 */
+                                sup->rfcr = SMC_EB;
+                                sup->tfcr = SMC_EB;
+
+                                /* Set this to 1 for now, so we get single
+                                 * character interrupts.  Using idle character
+                                 * time requires some additional tuning.
+                                 */
+                                sup->mrblr = 1;
+                                sup->max_idl = 0;
+                                sup->brkcr = 1;
+                                sup->parec = 0;
+                                sup->frmer = 0;
+                                sup->nosec = 0;
+                                sup->brkec = 0;
+                                sup->uaddr1 = 0;
+                                sup->uaddr2 = 0;
+                                sup->toseq = 0;
+                                {
+                                        int i;
+                                        for (i=0;i<8;i++)
+                                                sup->cc[i] = 0x8000;
+                                }
+                                sup->rccm = 0xc0ff;
+
+                                /* Send the CPM an initialize command.
+                                */
+                                chan = scc_chan_map[idx];
+
+                                /* execute the INIT RX & TX PARAMS command for this channel. */
+                                cp->cp_cr = mk_cr_cmd(chan, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+                                while (cp->cp_cr & CPM_CR_FLG);
+
+                                /* Set UART mode, 8 bit, no parity, one stop.
+                                 * Enable receive and transmit.
+                                 */
+                                scp->scc_gsmr.w.high = 0;
+                                scp->scc_gsmr.w.low = 
+                                        (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
+
+                                /* Disable all interrupts and clear all pending
+                                 * events.
+                                 */
+                                scp->scc_sccm = 0;
+                                scp->scc_scce = 0xffff;
+                                scp->scc_dsr = 0x7e7e;
+                                scp->scc_psmr = 0x3000;
+
+                                /* If the port is the console, enable Rx and Tx.
+                                */
+#ifdef CONFIG_SERIAL_CONSOLE
+                                if (i == CONFIG_SERIAL_CONSOLE_PORT)
+                                        scp->scc_gsmr.w.low |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+#endif
+                        }
+                        else {
+                                /* Configure SMCs Tx/Rx instead of port B
+                                 * parallel I/O.
+                                 */
+                                up = &pquicc->pram[info->state->port].scc.pothers.idma_smc.psmc.u;
+                                up->rbase = dp_addr;
+
+                                iobits = 0xc0 << (idx * 4);
+                                cp->pip_pbpar |= iobits;
+                                cp->pip_pbdir &= ~iobits;
+                                cp->pip_pbodr &= ~iobits;
+
+
+                                /* Connect the baud rate generator to the
+                                 * SMC based upon index in rs_table.  Also
+                                 * make sure it is connected to NMSI.
+                                 */
+                                cp->si_simode &= ~(0xffff << (idx * 16));
+                                cp->si_simode |= (i << ((idx * 16) + 12));
+
+                                up->tbase = dp_addr;
+
+                                /* Set up the uart parameters in the
+                                 * parameter ram.
+                                 */
+                                up->rfcr = SMC_EB;
+                                up->tfcr = SMC_EB;
+
+                                /* Set this to 1 for now, so we get single
+                                 * character interrupts.  Using idle character
+                                 * time requires some additional tuning.
+                                 */
+                                up->mrblr = 1;
+                                up->max_idl = 0;
+                                up->brkcr = 1;
+
+                                /* Send the CPM an initialize command.
+                                */
+                                chan = smc_chan_map[idx];
+
+                                cp->cp_cr = mk_cr_cmd(chan,
+                                                                          CPM_CR_INIT_TRX) | CPM_CR_FLG;
+#ifdef CONFIG_SERIAL_CONSOLE
+                                if (i == CONFIG_SERIAL_CONSOLE_PORT)
+                                        printk("");
+#endif
+                                while (cp->cp_cr & CPM_CR_FLG);
+
+                                /* Set UART mode, 8 bit, no parity, one stop.
+                                 * Enable receive and transmit.
+                                 */
+                                sp = &cp->smc_regs[idx];
+                                sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
+
+                                /* Disable all interrupts and clear all pending
+                                 * events.
+                                 */
+                                sp->smc_smcm = 0;
+                                sp->smc_smce = 0xff;
+
+                                /* If the port is the console, enable Rx and Tx.
+                                */
+#ifdef CONFIG_SERIAL_CONSOLE
+                                if (i == CONFIG_SERIAL_CONSOLE_PORT)
+                                        sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
+#endif
+                        }
+
+                        /* Install interrupt handler.
+                        */
+                        /* cpm_install_handler(IRQ_MACHSPEC | state->irq, rs_360_interrupt, info);  */
+                        /*request_irq(IRQ_MACHSPEC | state->irq, rs_360_interrupt, */
+                        request_irq(state->irq, rs_360_interrupt,
+                                                IRQ_FLG_LOCK, "ttyS", (void *)info);
+
+                        /* Set up the baud rate generator.
+                        */
+                        m360_cpm_setbrg(i, baud_table[baud_idx]);
+
+                }
+        }
+
+        return 0;
+}
+module_init(rs_360_init);
+
+/* This must always be called before the rs_360_init() function, otherwise
+ * it blows away the port control information.
+ */
+//static int __init serial_console_setup( struct console *co, char *options)
+int serial_console_setup( struct console *co, char *options)
+{
+        struct          serial_state    *ser;
+        uint            mem_addr, dp_addr, bidx, idx, iobits;
+        ushort          chan;
+        QUICC_BD        *bdp;
+        volatile        QUICC                   *cp;
+        volatile        struct smc_regs *sp;
+        volatile        struct scc_regs *scp;
+        volatile        struct smc_uart_pram    *up;
+        volatile        struct uart_pram                *sup;
+
+/* mleslie TODO:
+ * add something to the 68k bootloader to store a desired initial console baud rate */
+
+/*      bd_t                                            *bd; */ /* a board info struct used by EPPC-bug */
+/*      bd = (bd_t *)__res; */
+
+        for (bidx = 0; bidx < (sizeof(baud_table) / sizeof(int)); bidx++)
+         /* if (bd->bi_baudrate == baud_table[bidx]) */
+                if (CONSOLE_BAUDRATE == baud_table[bidx])
+                        break;
+
+        /* co->cflag = CREAD|CLOCAL|bidx|CS8; */
+        baud_idx = bidx;
+
+        ser = rs_table + CONFIG_SERIAL_CONSOLE_PORT;
+
+        cp = pquicc;    /* Get pointer to Communication Processor */
+
+        idx = PORT_NUM(ser->smc_scc_num);
+        if (ser->smc_scc_num & NUM_IS_SCC) {
+
+                /* TODO: need to set up SCC pin assignment etc. here */
+                
+        }
+        else {
+                iobits = 0xc0 << (idx * 4);
+                cp->pip_pbpar |= iobits;
+                cp->pip_pbdir &= ~iobits;
+                cp->pip_pbodr &= ~iobits;
+
+                /* Connect the baud rate generator to the
+                 * SMC based upon index in rs_table.  Also
+                 * make sure it is connected to NMSI.
+                 */
+                cp->si_simode &= ~(0xffff << (idx * 16));
+                cp->si_simode |= (idx << ((idx * 16) + 12));
+        }
+
+        /* When we get here, the CPM has been reset, so we need
+         * to configure the port.
+         * We need to allocate a transmit and receive buffer descriptor
+         * from dual port ram, and a character buffer area from host mem.
+         */
+
+        /* Allocate space for two buffer descriptors in the DP ram.
+        */
+        dp_addr = m360_cpm_dpalloc(sizeof(QUICC_BD) * CONSOLE_NUM_FIFO);
+
+        /* Allocate space for two 2 byte FIFOs in the host memory.
+         */
+        /* mem_addr = m360_cpm_hostalloc(8); */
+        mem_addr = (uint)console_fifos;
+
+
+        /* Set the physical address of the host memory buffers in
+         * the buffer descriptors.
+         */
+        /* bdp = (QUICC_BD *)&cp->cp_dpmem[dp_addr]; */
+        bdp = (QUICC_BD *)((uint)pquicc + dp_addr);
+        bdp->buf = (char *)mem_addr;
+        (bdp+1)->buf = (char *)(mem_addr+4);
+
+        /* For the receive, set empty and wrap.
+         * For transmit, set wrap.
+         */
+        bdp->status = BD_SC_EMPTY | BD_SC_WRAP;
+        (bdp+1)->status = BD_SC_WRAP;
+
+        /* Set up the uart parameters in the parameter ram.
+         */
+        if (ser->smc_scc_num & NUM_IS_SCC) {
+                scp = &cp->scc_regs[idx];
+                /* sup = (scc_uart_t *)&cp->cp_dparam[ser->port]; */
+                sup = &pquicc->pram[ser->port].scc.pscc.u;
+
+                sup->rbase = dp_addr;
+                sup->tbase = dp_addr + sizeof(QUICC_BD);
+
+                /* Set up the uart parameters in the
+                 * parameter ram.
+                 */
+                sup->rfcr = SMC_EB;
+                sup->tfcr = SMC_EB;
+
+                /* Set this to 1 for now, so we get single
+                 * character interrupts.  Using idle character
+                 * time requires some additional tuning.
+                 */
+                sup->mrblr = 1;
+                sup->max_idl = 0;
+                sup->brkcr = 1;
+                sup->parec = 0;
+                sup->frmer = 0;
+                sup->nosec = 0;
+                sup->brkec = 0;
+                sup->uaddr1 = 0;
+                sup->uaddr2 = 0;
+                sup->toseq = 0;
+                {
+                        int i;
+                        for (i=0;i<8;i++)
+                                sup->cc[i] = 0x8000;
+                }
+                sup->rccm = 0xc0ff;
+
+                /* Send the CPM an initialize command.
+                */
+                chan = scc_chan_map[idx];
+
+                cp->cp_cr = mk_cr_cmd(chan, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+                while (cp->cp_cr & CPM_CR_FLG);
+
+                /* Set UART mode, 8 bit, no parity, one stop.
+                 * Enable receive and transmit.
+                 */
+                scp->scc_gsmr.w.high = 0;
+                scp->scc_gsmr.w.low = 
+                        (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
+
+                /* Disable all interrupts and clear all pending
+                 * events.
+                 */
+                scp->scc_sccm = 0;
+                scp->scc_scce = 0xffff;
+                scp->scc_dsr = 0x7e7e;
+                scp->scc_psmr = 0x3000;
+
+                scp->scc_gsmr.w.low |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+        }
+        else {
+                /* up = (smc_uart_t *)&cp->cp_dparam[ser->port]; */
+                up = &pquicc->pram[ser->port].scc.pothers.idma_smc.psmc.u;
+
+                up->rbase = dp_addr;    /* Base of receive buffer desc. */
+                up->tbase = dp_addr+sizeof(QUICC_BD);   /* Base of xmt buffer desc. */
+                up->rfcr = SMC_EB;
+                up->tfcr = SMC_EB;
+
+                /* Set this to 1 for now, so we get single character interrupts.
+                */
+                up->mrblr = 1;          /* receive buffer length */
+                up->max_idl = 0;                /* wait forever for next char */
+
+                /* Send the CPM an initialize command.
+                */
+                chan = smc_chan_map[idx];
+                cp->cp_cr = mk_cr_cmd(chan, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+                while (cp->cp_cr & CPM_CR_FLG);
+
+                /* Set UART mode, 8 bit, no parity, one stop.
+                 * Enable receive and transmit.
+                 */
+                sp = &cp->smc_regs[idx];
+                sp->smc_smcmr = smcr_mk_clen(9) |  SMCMR_SM_UART;
+
+                /* And finally, enable Rx and Tx.
+                */
+                sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
+        }
+
+        /* Set up the baud rate generator.
+        */
+        /* m360_cpm_setbrg((ser - rs_table), bd->bi_baudrate); */
+        m360_cpm_setbrg((ser - rs_table), CONSOLE_BAUDRATE);
+
+        return 0;
+}
+
+/*
+ * Local variables:
+ *  c-indent-level: 4
+ *  c-basic-offset: 4
+ *  tab-width: 4
+ * End:
+ */
diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
new file mode 100644
index 000000000000..b4129f53fb1b
--- /dev/null
+++ b/drivers/tty/serial/8250.c
@@ -0,0 +1,3424 @@
+/*
+ *  Driver for 8250/16550-type serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright (C) 2001 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * A note about mapbase / membase
+ *
+ *  mapbase is the physical address of the IO port.
+ *  membase is an 'ioremapped' cookie.
+ */
+
+#if defined(CONFIG_SERIAL_8250_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/ratelimit.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_reg.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+#include <linux/nmi.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include "8250.h"
+
+#ifdef CONFIG_SPARC
+#include "suncore.h"
+#endif
+
+/*
+ * Configuration:
+ *   share_irqs - whether we pass IRQF_SHARED to request_irq().  This option
+ *                is unsafe when used on edge-triggered interrupts.
+ */
+static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
+
+static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
+
+static struct uart_driver serial8250_reg;
+
+static int serial_index(struct uart_port *port)
+{
+        return (serial8250_reg.minor - 64) + port->line;
+}
+
+static unsigned int skip_txen_test; /* force skip of txen test at init time */
+
+/*
+ * Debugging.
+ */
+#if 0
+#define DEBUG_AUTOCONF(fmt...)  printk(fmt)
+#else
+#define DEBUG_AUTOCONF(fmt...)  do { } while (0)
+#endif
+
+#if 0
+#define DEBUG_INTR(fmt...)      printk(fmt)
+#else
+#define DEBUG_INTR(fmt...)      do { } while (0)
+#endif
+
+#define PASS_LIMIT      256
+
+#define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
+
+
+/*
+ * We default to IRQ0 for the "no irq" hack.   Some
+ * machine types want others as well - they're free
+ * to redefine this in their header file.
+ */
+#define is_real_interrupt(irq)  ((irq) != 0)
+
+#ifdef CONFIG_SERIAL_8250_DETECT_IRQ
+#define CONFIG_SERIAL_DETECT_IRQ 1
+#endif
+#ifdef CONFIG_SERIAL_8250_MANY_PORTS
+#define CONFIG_SERIAL_MANY_PORTS 1
+#endif
+
+/*
+ * HUB6 is always on.  This will be removed once the header
+ * files have been cleaned.
+ */
+#define CONFIG_HUB6 1
+
+#include <asm/serial.h>
+/*
+ * SERIAL_PORT_DFNS tells us about built-in ports that have no
+ * standard enumeration mechanism.   Platforms that can find all
+ * serial ports via mechanisms like ACPI or PCI need not supply it.
+ */
+#ifndef SERIAL_PORT_DFNS
+#define SERIAL_PORT_DFNS
+#endif
+
+static const struct old_serial_port old_serial_port[] = {
+        SERIAL_PORT_DFNS /* defined in asm/serial.h */
+};
+
+#define UART_NR CONFIG_SERIAL_8250_NR_UARTS
+
+#ifdef CONFIG_SERIAL_8250_RSA
+
+#define PORT_RSA_MAX 4
+static unsigned long probe_rsa[PORT_RSA_MAX];
+static unsigned int probe_rsa_count;
+#endif /* CONFIG_SERIAL_8250_RSA  */
+
+struct uart_8250_port {
+        struct uart_port        port;
+        struct timer_list       timer;          /* "no irq" timer */
+        struct list_head        list;           /* ports on this IRQ */
+        unsigned short          capabilities;   /* port capabilities */
+        unsigned short          bugs;           /* port bugs */
+        unsigned int            tx_loadsz;      /* transmit fifo load size */
+        unsigned char           acr;
+        unsigned char           ier;
+        unsigned char           lcr;
+        unsigned char           mcr;
+        unsigned char           mcr_mask;       /* mask of user bits */
+        unsigned char           mcr_force;      /* mask of forced bits */
+        unsigned char           cur_iotype;     /* Running I/O type */
+
+        /*
+         * Some bits in registers are cleared on a read, so they must
+         * be saved whenever the register is read but the bits will not
+         * be immediately processed.
+         */
+#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
+        unsigned char           lsr_saved_flags;
+#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
+        unsigned char           msr_saved_flags;
+};
+
+struct irq_info {
+        struct                  hlist_node node;
+        int                     irq;
+        spinlock_t              lock;   /* Protects list not the hash */
+        struct list_head        *head;
+};
+
+#define NR_IRQ_HASH             32      /* Can be adjusted later */
+static struct hlist_head irq_lists[NR_IRQ_HASH];
+static DEFINE_MUTEX(hash_mutex);        /* Used to walk the hash */
+
+/*
+ * Here we define the default xmit fifo size used for each type of UART.
+ */
+static const struct serial8250_config uart_config[] = {
+        [PORT_UNKNOWN] = {
+                .name           = "unknown",
+                .fifo_size      = 1,
+                .tx_loadsz      = 1,
+        },
+        [PORT_8250] = {
+                .name           = "8250",
+                .fifo_size      = 1,
+                .tx_loadsz      = 1,
+        },
+        [PORT_16450] = {
+                .name           = "16450",
+                .fifo_size      = 1,
+                .tx_loadsz      = 1,
+        },
+        [PORT_16550] = {
+                .name           = "16550",
+                .fifo_size      = 1,
+                .tx_loadsz      = 1,
+        },
+        [PORT_16550A] = {
+                .name           = "16550A",
+                .fifo_size      = 16,
+                .tx_loadsz      = 16,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO,
+        },
+        [PORT_CIRRUS] = {
+                .name           = "Cirrus",
+                .fifo_size      = 1,
+                .tx_loadsz      = 1,
+        },
+        [PORT_16650] = {
+                .name           = "ST16650",
+                .fifo_size      = 1,
+                .tx_loadsz      = 1,
+                .flags          = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
+        },
+        [PORT_16650V2] = {
+                .name           = "ST16650V2",
+                .fifo_size      = 32,
+                .tx_loadsz      = 16,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
+                                  UART_FCR_T_TRIG_00,
+                .flags          = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
+        },
+        [PORT_16750] = {
+                .name           = "TI16750",
+                .fifo_size      = 64,
+                .tx_loadsz      = 64,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
+                                  UART_FCR7_64BYTE,
+                .flags          = UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE,
+        },
+        [PORT_STARTECH] = {
+                .name           = "Startech",
+                .fifo_size      = 1,
+                .tx_loadsz      = 1,
+        },
+        [PORT_16C950] = {
+                .name           = "16C950/954",
+                .fifo_size      = 128,
+                .tx_loadsz      = 128,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                /* UART_CAP_EFR breaks billionon CF bluetooth card. */
+                .flags          = UART_CAP_FIFO | UART_CAP_SLEEP,
+        },
+        [PORT_16654] = {
+                .name           = "ST16654",
+                .fifo_size      = 64,
+                .tx_loadsz      = 32,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
+                                  UART_FCR_T_TRIG_10,
+                .flags          = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
+        },
+        [PORT_16850] = {
+                .name           = "XR16850",
+                .fifo_size      = 128,
+                .tx_loadsz      = 128,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
+        },
+        [PORT_RSA] = {
+                .name           = "RSA",
+                .fifo_size      = 2048,
+                .tx_loadsz      = 2048,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_11,
+                .flags          = UART_CAP_FIFO,
+        },
+        [PORT_NS16550A] = {
+                .name           = "NS16550A",
+                .fifo_size      = 16,
+                .tx_loadsz      = 16,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO | UART_NATSEMI,
+        },
+        [PORT_XSCALE] = {
+                .name           = "XScale",
+                .fifo_size      = 32,
+                .tx_loadsz      = 32,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO | UART_CAP_UUE | UART_CAP_RTOIE,
+        },
+        [PORT_RM9000] = {
+                .name           = "RM9000",
+                .fifo_size      = 16,
+                .tx_loadsz      = 16,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO,
+        },
+        [PORT_OCTEON] = {
+                .name           = "OCTEON",
+                .fifo_size      = 64,
+                .tx_loadsz      = 64,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO,
+        },
+        [PORT_AR7] = {
+                .name           = "AR7",
+                .fifo_size      = 16,
+                .tx_loadsz      = 16,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00,
+                .flags          = UART_CAP_FIFO | UART_CAP_AFE,
+        },
+        [PORT_U6_16550A] = {
+                .name           = "U6_16550A",
+                .fifo_size      = 64,
+                .tx_loadsz      = 64,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+                .flags          = UART_CAP_FIFO | UART_CAP_AFE,
+        },
+        [PORT_TEGRA] = {
+                .name           = "Tegra",
+                .fifo_size      = 32,
+                .tx_loadsz      = 8,
+                .fcr            = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
+                                  UART_FCR_T_TRIG_01,
+                .flags          = UART_CAP_FIFO | UART_CAP_RTOIE,
+        },
+};
+
+#if defined(CONFIG_MIPS_ALCHEMY)
+
+/* Au1x00 UART hardware has a weird register layout */
+static const u8 au_io_in_map[] = {
+        [UART_RX]  = 0,
+        [UART_IER] = 2,
+        [UART_IIR] = 3,
+        [UART_LCR] = 5,
+        [UART_MCR] = 6,
+        [UART_LSR] = 7,
+        [UART_MSR] = 8,
+};
+
+static const u8 au_io_out_map[] = {
+        [UART_TX]  = 1,
+        [UART_IER] = 2,
+        [UART_FCR] = 4,
+        [UART_LCR] = 5,
+        [UART_MCR] = 6,
+};
+
+/* sane hardware needs no mapping */
+static inline int map_8250_in_reg(struct uart_port *p, int offset)
+{
+        if (p->iotype != UPIO_AU)
+                return offset;
+        return au_io_in_map[offset];
+}
+
+static inline int map_8250_out_reg(struct uart_port *p, int offset)
+{
+        if (p->iotype != UPIO_AU)
+                return offset;
+        return au_io_out_map[offset];
+}
+
+#elif defined(CONFIG_SERIAL_8250_RM9K)
+
+static const u8
+        regmap_in[8] = {
+                [UART_RX]       = 0x00,
+                [UART_IER]      = 0x0c,
+                [UART_IIR]      = 0x14,
+                [UART_LCR]      = 0x1c,
+                [UART_MCR]      = 0x20,
+                [UART_LSR]      = 0x24,
+                [UART_MSR]      = 0x28,
+                [UART_SCR]      = 0x2c
+        },
+        regmap_out[8] = {
+                [UART_TX]       = 0x04,
+                [UART_IER]      = 0x0c,
+                [UART_FCR]      = 0x18,
+                [UART_LCR]      = 0x1c,
+                [UART_MCR]      = 0x20,
+                [UART_LSR]      = 0x24,
+                [UART_MSR]      = 0x28,
+                [UART_SCR]      = 0x2c
+        };
+
+static inline int map_8250_in_reg(struct uart_port *p, int offset)
+{
+        if (p->iotype != UPIO_RM9000)
+                return offset;
+        return regmap_in[offset];
+}
+
+static inline int map_8250_out_reg(struct uart_port *p, int offset)
+{
+        if (p->iotype != UPIO_RM9000)
+                return offset;
+        return regmap_out[offset];
+}
+
+#else
+
+/* sane hardware needs no mapping */
+#define map_8250_in_reg(up, offset) (offset)
+#define map_8250_out_reg(up, offset) (offset)
+
+#endif
+
+static unsigned int hub6_serial_in(struct uart_port *p, int offset)
+{
+        offset = map_8250_in_reg(p, offset) << p->regshift;
+        outb(p->hub6 - 1 + offset, p->iobase);
+        return inb(p->iobase + 1);
+}
+
+static void hub6_serial_out(struct uart_port *p, int offset, int value)
+{
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        outb(p->hub6 - 1 + offset, p->iobase);
+        outb(value, p->iobase + 1);
+}
+
+static unsigned int mem_serial_in(struct uart_port *p, int offset)
+{
+        offset = map_8250_in_reg(p, offset) << p->regshift;
+        return readb(p->membase + offset);
+}
+
+static void mem_serial_out(struct uart_port *p, int offset, int value)
+{
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        writeb(value, p->membase + offset);
+}
+
+static void mem32_serial_out(struct uart_port *p, int offset, int value)
+{
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        writel(value, p->membase + offset);
+}
+
+static unsigned int mem32_serial_in(struct uart_port *p, int offset)
+{
+        offset = map_8250_in_reg(p, offset) << p->regshift;
+        return readl(p->membase + offset);
+}
+
+static unsigned int au_serial_in(struct uart_port *p, int offset)
+{
+        offset = map_8250_in_reg(p, offset) << p->regshift;
+        return __raw_readl(p->membase + offset);
+}
+
+static void au_serial_out(struct uart_port *p, int offset, int value)
+{
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        __raw_writel(value, p->membase + offset);
+}
+
+static unsigned int tsi_serial_in(struct uart_port *p, int offset)
+{
+        unsigned int tmp;
+        offset = map_8250_in_reg(p, offset) << p->regshift;
+        if (offset == UART_IIR) {
+                tmp = readl(p->membase + (UART_IIR & ~3));
+                return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */
+        } else
+                return readb(p->membase + offset);
+}
+
+static void tsi_serial_out(struct uart_port *p, int offset, int value)
+{
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        if (!((offset == UART_IER) && (value & UART_IER_UUE)))
+                writeb(value, p->membase + offset);
+}
+
+/* Save the LCR value so it can be re-written when a Busy Detect IRQ occurs. */
+static inline void dwapb_save_out_value(struct uart_port *p, int offset,
+                                        int value)
+{
+        struct uart_8250_port *up =
+                container_of(p, struct uart_8250_port, port);
+
+        if (offset == UART_LCR)
+                up->lcr = value;
+}
+
+/* Read the IER to ensure any interrupt is cleared before returning from ISR. */
+static inline void dwapb_check_clear_ier(struct uart_port *p, int offset)
+{
+        if (offset == UART_TX || offset == UART_IER)
+                p->serial_in(p, UART_IER);
+}
+
+static void dwapb_serial_out(struct uart_port *p, int offset, int value)
+{
+        int save_offset = offset;
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        dwapb_save_out_value(p, save_offset, value);
+        writeb(value, p->membase + offset);
+        dwapb_check_clear_ier(p, save_offset);
+}
+
+static void dwapb32_serial_out(struct uart_port *p, int offset, int value)
+{
+        int save_offset = offset;
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        dwapb_save_out_value(p, save_offset, value);
+        writel(value, p->membase + offset);
+        dwapb_check_clear_ier(p, save_offset);
+}
+
+static unsigned int io_serial_in(struct uart_port *p, int offset)
+{
+        offset = map_8250_in_reg(p, offset) << p->regshift;
+        return inb(p->iobase + offset);
+}
+
+static void io_serial_out(struct uart_port *p, int offset, int value)
+{
+        offset = map_8250_out_reg(p, offset) << p->regshift;
+        outb(value, p->iobase + offset);
+}
+
+static void set_io_from_upio(struct uart_port *p)
+{
+        struct uart_8250_port *up =
+                container_of(p, struct uart_8250_port, port);
+        switch (p->iotype) {
+        case UPIO_HUB6:
+                p->serial_in = hub6_serial_in;
+                p->serial_out = hub6_serial_out;
+                break;
+
+        case UPIO_MEM:
+                p->serial_in = mem_serial_in;
+                p->serial_out = mem_serial_out;
+                break;
+
+        case UPIO_RM9000:
+        case UPIO_MEM32:
+                p->serial_in = mem32_serial_in;
+                p->serial_out = mem32_serial_out;
+                break;
+
+        case UPIO_AU:
+                p->serial_in = au_serial_in;
+                p->serial_out = au_serial_out;
+                break;
+
+        case UPIO_TSI:
+                p->serial_in = tsi_serial_in;
+                p->serial_out = tsi_serial_out;
+                break;
+
+        case UPIO_DWAPB:
+                p->serial_in = mem_serial_in;
+                p->serial_out = dwapb_serial_out;
+                break;
+
+        case UPIO_DWAPB32:
+                p->serial_in = mem32_serial_in;
+                p->serial_out = dwapb32_serial_out;
+                break;
+
+        default:
+                p->serial_in = io_serial_in;
+                p->serial_out = io_serial_out;
+                break;
+        }
+        /* Remember loaded iotype */
+        up->cur_iotype = p->iotype;
+}
+
+static void
+serial_out_sync(struct uart_8250_port *up, int offset, int value)
+{
+        struct uart_port *p = &up->port;
+        switch (p->iotype) {
+        case UPIO_MEM:
+        case UPIO_MEM32:
+        case UPIO_AU:
+        case UPIO_DWAPB:
+        case UPIO_DWAPB32:
+                p->serial_out(p, offset, value);
+                p->serial_in(p, UART_LCR);      /* safe, no side-effects */
+                break;
+        default:
+                p->serial_out(p, offset, value);
+        }
+}
+
+#define serial_in(up, offset)           \
+        (up->port.serial_in(&(up)->port, (offset)))
+#define serial_out(up, offset, value)   \
+        (up->port.serial_out(&(up)->port, (offset), (value)))
+/*
+ * We used to support using pause I/O for certain machines.  We
+ * haven't supported this for a while, but just in case it's badly
+ * needed for certain old 386 machines, I've left these #define's
+ * in....
+ */
+#define serial_inp(up, offset)          serial_in(up, offset)
+#define serial_outp(up, offset, value)  serial_out(up, offset, value)
+
+/* Uart divisor latch read */
+static inline int _serial_dl_read(struct uart_8250_port *up)
+{
+        return serial_inp(up, UART_DLL) | serial_inp(up, UART_DLM) << 8;
+}
+
+/* Uart divisor latch write */
+static inline void _serial_dl_write(struct uart_8250_port *up, int value)
+{
+        serial_outp(up, UART_DLL, value & 0xff);
+        serial_outp(up, UART_DLM, value >> 8 & 0xff);
+}
+
+#if defined(CONFIG_MIPS_ALCHEMY)
+/* Au1x00 haven't got a standard divisor latch */
+static int serial_dl_read(struct uart_8250_port *up)
+{
+        if (up->port.iotype == UPIO_AU)
+                return __raw_readl(up->port.membase + 0x28);
+        else
+                return _serial_dl_read(up);
+}
+
+static void serial_dl_write(struct uart_8250_port *up, int value)
+{
+        if (up->port.iotype == UPIO_AU)
+                __raw_writel(value, up->port.membase + 0x28);
+        else
+                _serial_dl_write(up, value);
+}
+#elif defined(CONFIG_SERIAL_8250_RM9K)
+static int serial_dl_read(struct uart_8250_port *up)
+{
+        return  (up->port.iotype == UPIO_RM9000) ?
+                (((__raw_readl(up->port.membase + 0x10) << 8) |
+                (__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff) :
+                _serial_dl_read(up);
+}
+
+static void serial_dl_write(struct uart_8250_port *up, int value)
+{
+        if (up->port.iotype == UPIO_RM9000) {
+                __raw_writel(value, up->port.membase + 0x08);
+                __raw_writel(value >> 8, up->port.membase + 0x10);
+        } else {
+                _serial_dl_write(up, value);
+        }
+}
+#else
+#define serial_dl_read(up) _serial_dl_read(up)
+#define serial_dl_write(up, value) _serial_dl_write(up, value)
+#endif
+
+/*
+ * For the 16C950
+ */
+static void serial_icr_write(struct uart_8250_port *up, int offset, int value)
+{
+        serial_out(up, UART_SCR, offset);
+        serial_out(up, UART_ICR, value);
+}
+
+static unsigned int serial_icr_read(struct uart_8250_port *up, int offset)
+{
+        unsigned int value;
+
+        serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
+        serial_out(up, UART_SCR, offset);
+        value = serial_in(up, UART_ICR);
+        serial_icr_write(up, UART_ACR, up->acr);
+
+        return value;
+}
+
+/*
+ * FIFO support.
+ */
+static void serial8250_clear_fifos(struct uart_8250_port *p)
+{
+        if (p->capabilities & UART_CAP_FIFO) {
+                serial_outp(p, UART_FCR, UART_FCR_ENABLE_FIFO);
+                serial_outp(p, UART_FCR, UART_FCR_ENABLE_FIFO |
+                               UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+                serial_outp(p, UART_FCR, 0);
+        }
+}
+
+/*
+ * IER sleep support.  UARTs which have EFRs need the "extended
+ * capability" bit enabled.  Note that on XR16C850s, we need to
+ * reset LCR to write to IER.
+ */
+static void serial8250_set_sleep(struct uart_8250_port *p, int sleep)
+{
+        if (p->capabilities & UART_CAP_SLEEP) {
+                if (p->capabilities & UART_CAP_EFR) {
+                        serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_B);
+                        serial_outp(p, UART_EFR, UART_EFR_ECB);
+                        serial_outp(p, UART_LCR, 0);
+                }
+                serial_outp(p, UART_IER, sleep ? UART_IERX_SLEEP : 0);
+                if (p->capabilities & UART_CAP_EFR) {
+                        serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_B);
+                        serial_outp(p, UART_EFR, 0);
+                        serial_outp(p, UART_LCR, 0);
+                }
+        }
+}
+
+#ifdef CONFIG_SERIAL_8250_RSA
+/*
+ * Attempts to turn on the RSA FIFO.  Returns zero on failure.
+ * We set the port uart clock rate if we succeed.
+ */
+static int __enable_rsa(struct uart_8250_port *up)
+{
+        unsigned char mode;
+        int result;
+
+        mode = serial_inp(up, UART_RSA_MSR);
+        result = mode & UART_RSA_MSR_FIFO;
+
+        if (!result) {
+                serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
+                mode = serial_inp(up, UART_RSA_MSR);
+                result = mode & UART_RSA_MSR_FIFO;
+        }
+
+        if (result)
+                up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
+
+        return result;
+}
+
+static void enable_rsa(struct uart_8250_port *up)
+{
+        if (up->port.type == PORT_RSA) {
+                if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
+                        spin_lock_irq(&up->port.lock);
+                        __enable_rsa(up);
+                        spin_unlock_irq(&up->port.lock);
+                }
+                if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
+                        serial_outp(up, UART_RSA_FRR, 0);
+        }
+}
+
+/*
+ * Attempts to turn off the RSA FIFO.  Returns zero on failure.
+ * It is unknown why interrupts were disabled in here.  However,
+ * the caller is expected to preserve this behaviour by grabbing
+ * the spinlock before calling this function.
+ */
+static void disable_rsa(struct uart_8250_port *up)
+{
+        unsigned char mode;
+        int result;
+
+        if (up->port.type == PORT_RSA &&
+            up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
+                spin_lock_irq(&up->port.lock);
+
+                mode = serial_inp(up, UART_RSA_MSR);
+                result = !(mode & UART_RSA_MSR_FIFO);
+
+                if (!result) {
+                        serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
+                        mode = serial_inp(up, UART_RSA_MSR);
+                        result = !(mode & UART_RSA_MSR_FIFO);
+                }
+
+                if (result)
+                        up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
+                spin_unlock_irq(&up->port.lock);
+        }
+}
+#endif /* CONFIG_SERIAL_8250_RSA */
+
+/*
+ * This is a quickie test to see how big the FIFO is.
+ * It doesn't work at all the time, more's the pity.
+ */
+static int size_fifo(struct uart_8250_port *up)
+{
+        unsigned char old_fcr, old_mcr, old_lcr;
+        unsigned short old_dl;
+        int count;
+
+        old_lcr = serial_inp(up, UART_LCR);
+        serial_outp(up, UART_LCR, 0);
+        old_fcr = serial_inp(up, UART_FCR);
+        old_mcr = serial_inp(up, UART_MCR);
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                    UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+        serial_outp(up, UART_MCR, UART_MCR_LOOP);
+        serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A);
+        old_dl = serial_dl_read(up);
+        serial_dl_write(up, 0x0001);
+        serial_outp(up, UART_LCR, 0x03);
+        for (count = 0; count < 256; count++)
+                serial_outp(up, UART_TX, count);
+        mdelay(20);/* FIXME - schedule_timeout */
+        for (count = 0; (serial_inp(up, UART_LSR) & UART_LSR_DR) &&
+             (count < 256); count++)
+                serial_inp(up, UART_RX);
+        serial_outp(up, UART_FCR, old_fcr);
+        serial_outp(up, UART_MCR, old_mcr);
+        serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A);
+        serial_dl_write(up, old_dl);
+        serial_outp(up, UART_LCR, old_lcr);
+
+        return count;
+}
+
+/*
+ * Read UART ID using the divisor method - set DLL and DLM to zero
+ * and the revision will be in DLL and device type in DLM.  We
+ * preserve the device state across this.
+ */
+static unsigned int autoconfig_read_divisor_id(struct uart_8250_port *p)
+{
+        unsigned char old_dll, old_dlm, old_lcr;
+        unsigned int id;
+
+        old_lcr = serial_inp(p, UART_LCR);
+        serial_outp(p, UART_LCR, UART_LCR_CONF_MODE_A);
+
+        old_dll = serial_inp(p, UART_DLL);
+        old_dlm = serial_inp(p, UART_DLM);
+
+        serial_outp(p, UART_DLL, 0);
+        serial_outp(p, UART_DLM, 0);
+
+        id = serial_inp(p, UART_DLL) | serial_inp(p, UART_DLM) << 8;
+
+        serial_outp(p, UART_DLL, old_dll);
+        serial_outp(p, UART_DLM, old_dlm);
+        serial_outp(p, UART_LCR, old_lcr);
+
+        return id;
+}
+
+/*
+ * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's.
+ * When this function is called we know it is at least a StarTech
+ * 16650 V2, but it might be one of several StarTech UARTs, or one of
+ * its clones.  (We treat the broken original StarTech 16650 V1 as a
+ * 16550, and why not?  Startech doesn't seem to even acknowledge its
+ * existence.)
+ *
+ * What evil have men's minds wrought...
+ */
+static void autoconfig_has_efr(struct uart_8250_port *up)
+{
+        unsigned int id1, id2, id3, rev;
+
+        /*
+         * Everything with an EFR has SLEEP
+         */
+        up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP;
+
+        /*
+         * First we check to see if it's an Oxford Semiconductor UART.
+         *
+         * If we have to do this here because some non-National
+         * Semiconductor clone chips lock up if you try writing to the
+         * LSR register (which serial_icr_read does)
+         */
+
+        /*
+         * Check for Oxford Semiconductor 16C950.
+         *
+         * EFR [4] must be set else this test fails.
+         *
+         * This shouldn't be necessary, but Mike Hudson (Exoray@isys.ca)
+         * claims that it's needed for 952 dual UART's (which are not
+         * recommended for new designs).
+         */
+        up->acr = 0;
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+        serial_out(up, UART_EFR, UART_EFR_ECB);
+        serial_out(up, UART_LCR, 0x00);
+        id1 = serial_icr_read(up, UART_ID1);
+        id2 = serial_icr_read(up, UART_ID2);
+        id3 = serial_icr_read(up, UART_ID3);
+        rev = serial_icr_read(up, UART_REV);
+
+        DEBUG_AUTOCONF("950id=%02x:%02x:%02x:%02x ", id1, id2, id3, rev);
+
+        if (id1 == 0x16 && id2 == 0xC9 &&
+            (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) {
+                up->port.type = PORT_16C950;
+
+                /*
+                 * Enable work around for the Oxford Semiconductor 952 rev B
+                 * chip which causes it to seriously miscalculate baud rates
+                 * when DLL is 0.
+                 */
+                if (id3 == 0x52 && rev == 0x01)
+                        up->bugs |= UART_BUG_QUOT;
+                return;
+        }
+
+        /*
+         * We check for a XR16C850 by setting DLL and DLM to 0, and then
+         * reading back DLL and DLM.  The chip type depends on the DLM
+         * value read back:
+         *  0x10 - XR16C850 and the DLL contains the chip revision.
+         *  0x12 - XR16C2850.
+         *  0x14 - XR16C854.
+         */
+        id1 = autoconfig_read_divisor_id(up);
+        DEBUG_AUTOCONF("850id=%04x ", id1);
+
+        id2 = id1 >> 8;
+        if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) {
+                up->port.type = PORT_16850;
+                return;
+        }
+
+        /*
+         * It wasn't an XR16C850.
+         *
+         * We distinguish between the '654 and the '650 by counting
+         * how many bytes are in the FIFO.  I'm using this for now,
+         * since that's the technique that was sent to me in the
+         * serial driver update, but I'm not convinced this works.
+         * I've had problems doing this in the past.  -TYT
+         */
+        if (size_fifo(up) == 64)
+                up->port.type = PORT_16654;
+        else
+                up->port.type = PORT_16650V2;
+}
+
+/*
+ * We detected a chip without a FIFO.  Only two fall into
+ * this category - the original 8250 and the 16450.  The
+ * 16450 has a scratch register (accessible with LCR=0)
+ */
+static void autoconfig_8250(struct uart_8250_port *up)
+{
+        unsigned char scratch, status1, status2;
+
+        up->port.type = PORT_8250;
+
+        scratch = serial_in(up, UART_SCR);
+        serial_outp(up, UART_SCR, 0xa5);
+        status1 = serial_in(up, UART_SCR);
+        serial_outp(up, UART_SCR, 0x5a);
+        status2 = serial_in(up, UART_SCR);
+        serial_outp(up, UART_SCR, scratch);
+
+        if (status1 == 0xa5 && status2 == 0x5a)
+                up->port.type = PORT_16450;
+}
+
+static int broken_efr(struct uart_8250_port *up)
+{
+        /*
+         * Exar ST16C2550 "A2" devices incorrectly detect as
+         * having an EFR, and report an ID of 0x0201.  See
+         * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html 
+         */
+        if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16)
+                return 1;
+
+        return 0;
+}
+
+static inline int ns16550a_goto_highspeed(struct uart_8250_port *up)
+{
+        unsigned char status;
+
+        status = serial_in(up, 0x04); /* EXCR2 */
+#define PRESL(x) ((x) & 0x30)
+        if (PRESL(status) == 0x10) {
+                /* already in high speed mode */
+                return 0;
+        } else {
+                status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */
+                status |= 0x10;  /* 1.625 divisor for baud_base --> 921600 */
+                serial_outp(up, 0x04, status);
+        }
+        return 1;
+}
+
+/*
+ * We know that the chip has FIFOs.  Does it have an EFR?  The
+ * EFR is located in the same register position as the IIR and
+ * we know the top two bits of the IIR are currently set.  The
+ * EFR should contain zero.  Try to read the EFR.
+ */
+static void autoconfig_16550a(struct uart_8250_port *up)
+{
+        unsigned char status1, status2;
+        unsigned int iersave;
+
+        up->port.type = PORT_16550A;
+        up->capabilities |= UART_CAP_FIFO;
+
+        /*
+         * Check for presence of the EFR when DLAB is set.
+         * Only ST16C650V1 UARTs pass this test.
+         */
+        serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A);
+        if (serial_in(up, UART_EFR) == 0) {
+                serial_outp(up, UART_EFR, 0xA8);
+                if (serial_in(up, UART_EFR) != 0) {
+                        DEBUG_AUTOCONF("EFRv1 ");
+                        up->port.type = PORT_16650;
+                        up->capabilities |= UART_CAP_EFR | UART_CAP_SLEEP;
+                } else {
+                        DEBUG_AUTOCONF("Motorola 8xxx DUART ");
+                }
+                serial_outp(up, UART_EFR, 0);
+                return;
+        }
+
+        /*
+         * Maybe it requires 0xbf to be written to the LCR.
+         * (other ST16C650V2 UARTs, TI16C752A, etc)
+         */
+        serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
+        if (serial_in(up, UART_EFR) == 0 && !broken_efr(up)) {
+                DEBUG_AUTOCONF("EFRv2 ");
+                autoconfig_has_efr(up);
+                return;
+        }
+
+        /*
+         * Check for a National Semiconductor SuperIO chip.
+         * Attempt to switch to bank 2, read the value of the LOOP bit
+         * from EXCR1. Switch back to bank 0, change it in MCR. Then
+         * switch back to bank 2, read it from EXCR1 again and check
+         * it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2
+         */
+        serial_outp(up, UART_LCR, 0);
+        status1 = serial_in(up, UART_MCR);
+        serial_outp(up, UART_LCR, 0xE0);
+        status2 = serial_in(up, 0x02); /* EXCR1 */
+
+        if (!((status2 ^ status1) & UART_MCR_LOOP)) {
+                serial_outp(up, UART_LCR, 0);
+                serial_outp(up, UART_MCR, status1 ^ UART_MCR_LOOP);
+                serial_outp(up, UART_LCR, 0xE0);
+                status2 = serial_in(up, 0x02); /* EXCR1 */
+                serial_outp(up, UART_LCR, 0);
+                serial_outp(up, UART_MCR, status1);
+
+                if ((status2 ^ status1) & UART_MCR_LOOP) {
+                        unsigned short quot;
+
+                        serial_outp(up, UART_LCR, 0xE0);
+
+                        quot = serial_dl_read(up);
+                        quot <<= 3;
+
+                        if (ns16550a_goto_highspeed(up))
+                                serial_dl_write(up, quot);
+
+                        serial_outp(up, UART_LCR, 0);
+
+                        up->port.uartclk = 921600*16;
+                        up->port.type = PORT_NS16550A;
+                        up->capabilities |= UART_NATSEMI;
+                        return;
+                }
+        }
+
+        /*
+         * No EFR.  Try to detect a TI16750, which only sets bit 5 of
+         * the IIR when 64 byte FIFO mode is enabled when DLAB is set.
+         * Try setting it with and without DLAB set.  Cheap clones
+         * set bit 5 without DLAB set.
+         */
+        serial_outp(up, UART_LCR, 0);
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
+        status1 = serial_in(up, UART_IIR) >> 5;
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_A);
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
+        status2 = serial_in(up, UART_IIR) >> 5;
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        serial_outp(up, UART_LCR, 0);
+
+        DEBUG_AUTOCONF("iir1=%d iir2=%d ", status1, status2);
+
+        if (status1 == 6 && status2 == 7) {
+                up->port.type = PORT_16750;
+                up->capabilities |= UART_CAP_AFE | UART_CAP_SLEEP;
+                return;
+        }
+
+        /*
+         * Try writing and reading the UART_IER_UUE bit (b6).
+         * If it works, this is probably one of the Xscale platform's
+         * internal UARTs.
+         * We're going to explicitly set the UUE bit to 0 before
+         * trying to write and read a 1 just to make sure it's not
+         * already a 1 and maybe locked there before we even start start.
+         */
+        iersave = serial_in(up, UART_IER);
+        serial_outp(up, UART_IER, iersave & ~UART_IER_UUE);
+        if (!(serial_in(up, UART_IER) & UART_IER_UUE)) {
+                /*
+                 * OK it's in a known zero state, try writing and reading
+                 * without disturbing the current state of the other bits.
+                 */
+                serial_outp(up, UART_IER, iersave | UART_IER_UUE);
+                if (serial_in(up, UART_IER) & UART_IER_UUE) {
+                        /*
+                         * It's an Xscale.
+                         * We'll leave the UART_IER_UUE bit set to 1 (enabled).
+                         */
+                        DEBUG_AUTOCONF("Xscale ");
+                        up->port.type = PORT_XSCALE;
+                        up->capabilities |= UART_CAP_UUE;
+                        return;
+                }
+        } else {
+                /*
+                 * If we got here we couldn't force the IER_UUE bit to 0.
+                 * Log it and continue.
+                 */
+                DEBUG_AUTOCONF("Couldn't force IER_UUE to 0 ");
+        }
+        serial_outp(up, UART_IER, iersave);
+
+        /*
+         * We distinguish between 16550A and U6 16550A by counting
+         * how many bytes are in the FIFO.
+         */
+        if (up->port.type == PORT_16550A && size_fifo(up) == 64) {
+                up->port.type = PORT_U6_16550A;
+                up->capabilities |= UART_CAP_AFE;
+        }
+}
+
+/*
+ * This routine is called by rs_init() to initialize a specific serial
+ * port.  It determines what type of UART chip this serial port is
+ * using: 8250, 16450, 16550, 16550A.  The important question is
+ * whether or not this UART is a 16550A or not, since this will
+ * determine whether or not we can use its FIFO features or not.
+ */
+static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
+{
+        unsigned char status1, scratch, scratch2, scratch3;
+        unsigned char save_lcr, save_mcr;
+        unsigned long flags;
+
+        if (!up->port.iobase && !up->port.mapbase && !up->port.membase)
+                return;
+
+        DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ",
+                       serial_index(&up->port), up->port.iobase, up->port.membase);
+
+        /*
+         * We really do need global IRQs disabled here - we're going to
+         * be frobbing the chips IRQ enable register to see if it exists.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        up->capabilities = 0;
+        up->bugs = 0;
+
+        if (!(up->port.flags & UPF_BUGGY_UART)) {
+                /*
+                 * Do a simple existence test first; if we fail this,
+                 * there's no point trying anything else.
+                 *
+                 * 0x80 is used as a nonsense port to prevent against
+                 * false positives due to ISA bus float.  The
+                 * assumption is that 0x80 is a non-existent port;
+                 * which should be safe since include/asm/io.h also
+                 * makes this assumption.
+                 *
+                 * Note: this is safe as long as MCR bit 4 is clear
+                 * and the device is in "PC" mode.
+                 */
+                scratch = serial_inp(up, UART_IER);
+                serial_outp(up, UART_IER, 0);
+#ifdef __i386__
+                outb(0xff, 0x080);
+#endif
+                /*
+                 * Mask out IER[7:4] bits for test as some UARTs (e.g. TL
+                 * 16C754B) allow only to modify them if an EFR bit is set.
+                 */
+                scratch2 = serial_inp(up, UART_IER) & 0x0f;
+                serial_outp(up, UART_IER, 0x0F);
+#ifdef __i386__
+                outb(0, 0x080);
+#endif
+                scratch3 = serial_inp(up, UART_IER) & 0x0f;
+                serial_outp(up, UART_IER, scratch);
+                if (scratch2 != 0 || scratch3 != 0x0F) {
+                        /*
+                         * We failed; there's nothing here
+                         */
+                        DEBUG_AUTOCONF("IER test failed (%02x, %02x) ",
+                                       scratch2, scratch3);
+                        goto out;
+                }
+        }
+
+        save_mcr = serial_in(up, UART_MCR);
+        save_lcr = serial_in(up, UART_LCR);
+
+        /*
+         * Check to see if a UART is really there.  Certain broken
+         * internal modems based on the Rockwell chipset fail this
+         * test, because they apparently don't implement the loopback
+         * test mode.  So this test is skipped on the COM 1 through
+         * COM 4 ports.  This *should* be safe, since no board
+         * manufacturer would be stupid enough to design a board
+         * that conflicts with COM 1-4 --- we hope!
+         */
+        if (!(up->port.flags & UPF_SKIP_TEST)) {
+                serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
+                status1 = serial_inp(up, UART_MSR) & 0xF0;
+                serial_outp(up, UART_MCR, save_mcr);
+                if (status1 != 0x90) {
+                        DEBUG_AUTOCONF("LOOP test failed (%02x) ",
+                                       status1);
+                        goto out;
+                }
+        }
+
+        /*
+         * We're pretty sure there's a port here.  Lets find out what
+         * type of port it is.  The IIR top two bits allows us to find
+         * out if it's 8250 or 16450, 16550, 16550A or later.  This
+         * determines what we test for next.
+         *
+         * We also initialise the EFR (if any) to zero for later.  The
+         * EFR occupies the same register location as the FCR and IIR.
+         */
+        serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
+        serial_outp(up, UART_EFR, 0);
+        serial_outp(up, UART_LCR, 0);
+
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        scratch = serial_in(up, UART_IIR) >> 6;
+
+        DEBUG_AUTOCONF("iir=%d ", scratch);
+
+        switch (scratch) {
+        case 0:
+                autoconfig_8250(up);
+                break;
+        case 1:
+                up->port.type = PORT_UNKNOWN;
+                break;
+        case 2:
+                up->port.type = PORT_16550;
+                break;
+        case 3:
+                autoconfig_16550a(up);
+                break;
+        }
+
+#ifdef CONFIG_SERIAL_8250_RSA
+        /*
+         * Only probe for RSA ports if we got the region.
+         */
+        if (up->port.type == PORT_16550A && probeflags & PROBE_RSA) {
+                int i;
+
+                for (i = 0 ; i < probe_rsa_count; ++i) {
+                        if (probe_rsa[i] == up->port.iobase &&
+                            __enable_rsa(up)) {
+                                up->port.type = PORT_RSA;
+                                break;
+                        }
+                }
+        }
+#endif
+
+        serial_outp(up, UART_LCR, save_lcr);
+
+        if (up->capabilities != uart_config[up->port.type].flags) {
+                printk(KERN_WARNING
+                       "ttyS%d: detected caps %08x should be %08x\n",
+                       serial_index(&up->port), up->capabilities,
+                       uart_config[up->port.type].flags);
+        }
+
+        up->port.fifosize = uart_config[up->port.type].fifo_size;
+        up->capabilities = uart_config[up->port.type].flags;
+        up->tx_loadsz = uart_config[up->port.type].tx_loadsz;
+
+        if (up->port.type == PORT_UNKNOWN)
+                goto out;
+
+        /*
+         * Reset the UART.
+         */
+#ifdef CONFIG_SERIAL_8250_RSA
+        if (up->port.type == PORT_RSA)
+                serial_outp(up, UART_RSA_FRR, 0);
+#endif
+        serial_outp(up, UART_MCR, save_mcr);
+        serial8250_clear_fifos(up);
+        serial_in(up, UART_RX);
+        if (up->capabilities & UART_CAP_UUE)
+                serial_outp(up, UART_IER, UART_IER_UUE);
+        else
+                serial_outp(up, UART_IER, 0);
+
+ out:
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        DEBUG_AUTOCONF("type=%s\n", uart_config[up->port.type].name);
+}
+
+static void autoconfig_irq(struct uart_8250_port *up)
+{
+        unsigned char save_mcr, save_ier;
+        unsigned char save_ICP = 0;
+        unsigned int ICP = 0;
+        unsigned long irqs;
+        int irq;
+
+        if (up->port.flags & UPF_FOURPORT) {
+                ICP = (up->port.iobase & 0xfe0) | 0x1f;
+                save_ICP = inb_p(ICP);
+                outb_p(0x80, ICP);
+                (void) inb_p(ICP);
+        }
+
+        /* forget possible initially masked and pending IRQ */
+        probe_irq_off(probe_irq_on());
+        save_mcr = serial_inp(up, UART_MCR);
+        save_ier = serial_inp(up, UART_IER);
+        serial_outp(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
+
+        irqs = probe_irq_on();
+        serial_outp(up, UART_MCR, 0);
+        udelay(10);
+        if (up->port.flags & UPF_FOURPORT) {
+                serial_outp(up, UART_MCR,
+                            UART_MCR_DTR | UART_MCR_RTS);
+        } else {
+                serial_outp(up, UART_MCR,
+                            UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
+        }
+        serial_outp(up, UART_IER, 0x0f);        /* enable all intrs */
+        (void)serial_inp(up, UART_LSR);
+        (void)serial_inp(up, UART_RX);
+        (void)serial_inp(up, UART_IIR);
+        (void)serial_inp(up, UART_MSR);
+        serial_outp(up, UART_TX, 0xFF);
+        udelay(20);
+        irq = probe_irq_off(irqs);
+
+        serial_outp(up, UART_MCR, save_mcr);
+        serial_outp(up, UART_IER, save_ier);
+
+        if (up->port.flags & UPF_FOURPORT)
+                outb_p(save_ICP, ICP);
+
+        up->port.irq = (irq > 0) ? irq : 0;
+}
+
+static inline void __stop_tx(struct uart_8250_port *p)
+{
+        if (p->ier & UART_IER_THRI) {
+                p->ier &= ~UART_IER_THRI;
+                serial_out(p, UART_IER, p->ier);
+        }
+}
+
+static void serial8250_stop_tx(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+
+        __stop_tx(up);
+
+        /*
+         * We really want to stop the transmitter from sending.
+         */
+        if (up->port.type == PORT_16C950) {
+                up->acr |= UART_ACR_TXDIS;
+                serial_icr_write(up, UART_ACR, up->acr);
+        }
+}
+
+static void transmit_chars(struct uart_8250_port *up);
+
+static void serial8250_start_tx(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+
+        if (!(up->ier & UART_IER_THRI)) {
+                up->ier |= UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+
+                if (up->bugs & UART_BUG_TXEN) {
+                        unsigned char lsr;
+                        lsr = serial_in(up, UART_LSR);
+                        up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+                        if ((up->port.type == PORT_RM9000) ?
+                                (lsr & UART_LSR_THRE) :
+                                (lsr & UART_LSR_TEMT))
+                                transmit_chars(up);
+                }
+        }
+
+        /*
+         * Re-enable the transmitter if we disabled it.
+         */
+        if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
+                up->acr &= ~UART_ACR_TXDIS;
+                serial_icr_write(up, UART_ACR, up->acr);
+        }
+}
+
+static void serial8250_stop_rx(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+
+        up->ier &= ~UART_IER_RLSI;
+        up->port.read_status_mask &= ~UART_LSR_DR;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static void serial8250_enable_ms(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+
+        /* no MSR capabilities */
+        if (up->bugs & UART_BUG_NOMSR)
+                return;
+
+        up->ier |= UART_IER_MSI;
+        serial_out(up, UART_IER, up->ier);
+}
+
+/*
+ * Clear the Tegra rx fifo after a break
+ *
+ * FIXME: This needs to become a port specific callback once we have a
+ * framework for this
+ */
+static void clear_rx_fifo(struct uart_8250_port *up)
+{
+        unsigned int status, tmout = 10000;
+        do {
+                status = serial_in(up, UART_LSR);
+                if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
+                        status = serial_in(up, UART_RX);
+                else
+                        break;
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while (1);
+}
+
+static void
+receive_chars(struct uart_8250_port *up, unsigned int *status)
+{
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned char ch, lsr = *status;
+        int max_count = 256;
+        char flag;
+
+        do {
+                if (likely(lsr & UART_LSR_DR))
+                        ch = serial_inp(up, UART_RX);
+                else
+                        /*
+                         * Intel 82571 has a Serial Over Lan device that will
+                         * set UART_LSR_BI without setting UART_LSR_DR when
+                         * it receives a break. To avoid reading from the
+                         * receive buffer without UART_LSR_DR bit set, we
+                         * just force the read character to be 0
+                         */
+                        ch = 0;
+
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                lsr |= up->lsr_saved_flags;
+                up->lsr_saved_flags = 0;
+
+                if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
+                        /*
+                         * For statistics only
+                         */
+                        if (lsr & UART_LSR_BI) {
+                                lsr &= ~(UART_LSR_FE | UART_LSR_PE);
+                                up->port.icount.brk++;
+                                /*
+                                 * If tegra port then clear the rx fifo to
+                                 * accept another break/character.
+                                 */
+                                if (up->port.type == PORT_TEGRA)
+                                        clear_rx_fifo(up);
+
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        goto ignore_char;
+                        } else if (lsr & UART_LSR_PE)
+                                up->port.icount.parity++;
+                        else if (lsr & UART_LSR_FE)
+                                up->port.icount.frame++;
+                        if (lsr & UART_LSR_OE)
+                                up->port.icount.overrun++;
+
+                        /*
+                         * Mask off conditions which should be ignored.
+                         */
+                        lsr &= up->port.read_status_mask;
+
+                        if (lsr & UART_LSR_BI) {
+                                DEBUG_INTR("handling break....");
+                                flag = TTY_BREAK;
+                        } else if (lsr & UART_LSR_PE)
+                                flag = TTY_PARITY;
+                        else if (lsr & UART_LSR_FE)
+                                flag = TTY_FRAME;
+                }
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
+
+ignore_char:
+                lsr = serial_inp(up, UART_LSR);
+        } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
+        spin_unlock(&up->port.lock);
+        tty_flip_buffer_push(tty);
+        spin_lock(&up->port.lock);
+        *status = lsr;
+}
+
+static void transmit_chars(struct uart_8250_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int count;
+
+        if (up->port.x_char) {
+                serial_outp(up, UART_TX, up->port.x_char);
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+        if (uart_tx_stopped(&up->port)) {
+                serial8250_stop_tx(&up->port);
+                return;
+        }
+        if (uart_circ_empty(xmit)) {
+                __stop_tx(up);
+                return;
+        }
+
+        count = up->tx_loadsz;
+        do {
+                serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        DEBUG_INTR("THRE...");
+
+        if (uart_circ_empty(xmit))
+                __stop_tx(up);
+}
+
+static unsigned int check_modem_status(struct uart_8250_port *up)
+{
+        unsigned int status = serial_in(up, UART_MSR);
+
+        status |= up->msr_saved_flags;
+        up->msr_saved_flags = 0;
+        if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
+            up->port.state != NULL) {
+                if (status & UART_MSR_TERI)
+                        up->port.icount.rng++;
+                if (status & UART_MSR_DDSR)
+                        up->port.icount.dsr++;
+                if (status & UART_MSR_DDCD)
+                        uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+                if (status & UART_MSR_DCTS)
+                        uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+
+                wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+        }
+
+        return status;
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static void serial8250_handle_port(struct uart_8250_port *up)
+{
+        unsigned int status;
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        status = serial_inp(up, UART_LSR);
+
+        DEBUG_INTR("status = %x...", status);
+
+        if (status & (UART_LSR_DR | UART_LSR_BI))
+                receive_chars(up, &status);
+        check_modem_status(up);
+        if (status & UART_LSR_THRE)
+                transmit_chars(up);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+/*
+ * This is the serial driver's interrupt routine.
+ *
+ * Arjan thinks the old way was overly complex, so it got simplified.
+ * Alan disagrees, saying that need the complexity to handle the weird
+ * nature of ISA shared interrupts.  (This is a special exception.)
+ *
+ * In order to handle ISA shared interrupts properly, we need to check
+ * that all ports have been serviced, and therefore the ISA interrupt
+ * line has been de-asserted.
+ *
+ * This means we need to loop through all ports. checking that they
+ * don't have an interrupt pending.
+ */
+static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
+{
+        struct irq_info *i = dev_id;
+        struct list_head *l, *end = NULL;
+        int pass_counter = 0, handled = 0;
+
+        DEBUG_INTR("serial8250_interrupt(%d)...", irq);
+
+        spin_lock(&i->lock);
+
+        l = i->head;
+        do {
+                struct uart_8250_port *up;
+                unsigned int iir;
+
+                up = list_entry(l, struct uart_8250_port, list);
+
+                iir = serial_in(up, UART_IIR);
+                if (!(iir & UART_IIR_NO_INT)) {
+                        serial8250_handle_port(up);
+
+                        handled = 1;
+
+                        end = NULL;
+                } else if ((up->port.iotype == UPIO_DWAPB ||
+                            up->port.iotype == UPIO_DWAPB32) &&
+                          (iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
+                        /* The DesignWare APB UART has an Busy Detect (0x07)
+                         * interrupt meaning an LCR write attempt occurred while the
+                         * UART was busy. The interrupt must be cleared by reading
+                         * the UART status register (USR) and the LCR re-written. */
+                        unsigned int status;
+                        status = *(volatile u32 *)up->port.private_data;
+                        serial_out(up, UART_LCR, up->lcr);
+
+                        handled = 1;
+
+                        end = NULL;
+                } else if (end == NULL)
+                        end = l;
+
+                l = l->next;
+
+                if (l == i->head && pass_counter++ > PASS_LIMIT) {
+                        /* If we hit this, we're dead. */
+                        printk_ratelimited(KERN_ERR
+                                "serial8250: too much work for irq%d\n", irq);
+                        break;
+                }
+        } while (l != end);
+
+        spin_unlock(&i->lock);
+
+        DEBUG_INTR("end.\n");
+
+        return IRQ_RETVAL(handled);
+}
+
+/*
+ * To support ISA shared interrupts, we need to have one interrupt
+ * handler that ensures that the IRQ line has been deasserted
+ * before returning.  Failing to do this will result in the IRQ
+ * line being stuck active, and, since ISA irqs are edge triggered,
+ * no more IRQs will be seen.
+ */
+static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
+{
+        spin_lock_irq(&i->lock);
+
+        if (!list_empty(i->head)) {
+                if (i->head == &up->list)
+                        i->head = i->head->next;
+                list_del(&up->list);
+        } else {
+                BUG_ON(i->head != &up->list);
+                i->head = NULL;
+        }
+        spin_unlock_irq(&i->lock);
+        /* List empty so throw away the hash node */
+        if (i->head == NULL) {
+                hlist_del(&i->node);
+                kfree(i);
+        }
+}
+
+static int serial_link_irq_chain(struct uart_8250_port *up)
+{
+        struct hlist_head *h;
+        struct hlist_node *n;
+        struct irq_info *i;
+        int ret, irq_flags = up->port.flags & UPF_SHARE_IRQ ? IRQF_SHARED : 0;
+
+        mutex_lock(&hash_mutex);
+
+        h = &irq_lists[up->port.irq % NR_IRQ_HASH];
+
+        hlist_for_each(n, h) {
+                i = hlist_entry(n, struct irq_info, node);
+                if (i->irq == up->port.irq)
+                        break;
+        }
+
+        if (n == NULL) {
+                i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
+                if (i == NULL) {
+                        mutex_unlock(&hash_mutex);
+                        return -ENOMEM;
+                }
+                spin_lock_init(&i->lock);
+                i->irq = up->port.irq;
+                hlist_add_head(&i->node, h);
+        }
+        mutex_unlock(&hash_mutex);
+
+        spin_lock_irq(&i->lock);
+
+        if (i->head) {
+                list_add(&up->list, i->head);
+                spin_unlock_irq(&i->lock);
+
+                ret = 0;
+        } else {
+                INIT_LIST_HEAD(&up->list);
+                i->head = &up->list;
+                spin_unlock_irq(&i->lock);
+                irq_flags |= up->port.irqflags;
+                ret = request_irq(up->port.irq, serial8250_interrupt,
+                                  irq_flags, "serial", i);
+                if (ret < 0)
+                        serial_do_unlink(i, up);
+        }
+
+        return ret;
+}
+
+static void serial_unlink_irq_chain(struct uart_8250_port *up)
+{
+        struct irq_info *i;
+        struct hlist_node *n;
+        struct hlist_head *h;
+
+        mutex_lock(&hash_mutex);
+
+        h = &irq_lists[up->port.irq % NR_IRQ_HASH];
+
+        hlist_for_each(n, h) {
+                i = hlist_entry(n, struct irq_info, node);
+                if (i->irq == up->port.irq)
+                        break;
+        }
+
+        BUG_ON(n == NULL);
+        BUG_ON(i->head == NULL);
+
+        if (list_empty(i->head))
+                free_irq(up->port.irq, i);
+
+        serial_do_unlink(i, up);
+        mutex_unlock(&hash_mutex);
+}
+
+/*
+ * This function is used to handle ports that do not have an
+ * interrupt.  This doesn't work very well for 16450's, but gives
+ * barely passable results for a 16550A.  (Although at the expense
+ * of much CPU overhead).
+ */
+static void serial8250_timeout(unsigned long data)
+{
+        struct uart_8250_port *up = (struct uart_8250_port *)data;
+        unsigned int iir;
+
+        iir = serial_in(up, UART_IIR);
+        if (!(iir & UART_IIR_NO_INT))
+                serial8250_handle_port(up);
+        mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
+}
+
+static void serial8250_backup_timeout(unsigned long data)
+{
+        struct uart_8250_port *up = (struct uart_8250_port *)data;
+        unsigned int iir, ier = 0, lsr;
+        unsigned long flags;
+
+        /*
+         * Must disable interrupts or else we risk racing with the interrupt
+         * based handler.
+         */
+        if (is_real_interrupt(up->port.irq)) {
+                ier = serial_in(up, UART_IER);
+                serial_out(up, UART_IER, 0);
+        }
+
+        iir = serial_in(up, UART_IIR);
+
+        /*
+         * This should be a safe test for anyone who doesn't trust the
+         * IIR bits on their UART, but it's specifically designed for
+         * the "Diva" UART used on the management processor on many HP
+         * ia64 and parisc boxes.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+        lsr = serial_in(up, UART_LSR);
+        up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
+            (!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
+            (lsr & UART_LSR_THRE)) {
+                iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
+                iir |= UART_IIR_THRI;
+        }
+
+        if (!(iir & UART_IIR_NO_INT))
+                serial8250_handle_port(up);
+
+        if (is_real_interrupt(up->port.irq))
+                serial_out(up, UART_IER, ier);
+
+        /* Standard timer interval plus 0.2s to keep the port running */
+        mod_timer(&up->timer,
+                jiffies + uart_poll_timeout(&up->port) + HZ / 5);
+}
+
+static unsigned int serial8250_tx_empty(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned long flags;
+        unsigned int lsr;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        lsr = serial_in(up, UART_LSR);
+        up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int serial8250_get_mctrl(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned int status;
+        unsigned int ret;
+
+        status = check_modem_status(up);
+
+        ret = 0;
+        if (status & UART_MSR_DCD)
+                ret |= TIOCM_CAR;
+        if (status & UART_MSR_RI)
+                ret |= TIOCM_RNG;
+        if (status & UART_MSR_DSR)
+                ret |= TIOCM_DSR;
+        if (status & UART_MSR_CTS)
+                ret |= TIOCM_CTS;
+        return ret;
+}
+
+static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned char mcr = 0;
+
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr;
+
+        serial_out(up, UART_MCR, mcr);
+}
+
+static void serial8250_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (break_state == -1)
+                up->lcr |= UART_LCR_SBC;
+        else
+                up->lcr &= ~UART_LCR_SBC;
+        serial_out(up, UART_LCR, up->lcr);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+/*
+ *      Wait for transmitter & holding register to empty
+ */
+static void wait_for_xmitr(struct uart_8250_port *up, int bits)
+{
+        unsigned int status, tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        for (;;) {
+                status = serial_in(up, UART_LSR);
+
+                up->lsr_saved_flags |= status & LSR_SAVE_FLAGS;
+
+                if ((status & bits) == bits)
+                        break;
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        }
+
+        /* Wait up to 1s for flow control if necessary */
+        if (up->port.flags & UPF_CONS_FLOW) {
+                unsigned int tmout;
+                for (tmout = 1000000; tmout; tmout--) {
+                        unsigned int msr = serial_in(up, UART_MSR);
+                        up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
+                        if (msr & UART_MSR_CTS)
+                                break;
+                        udelay(1);
+                        touch_nmi_watchdog();
+                }
+        }
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+/*
+ * Console polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+static int serial8250_get_poll_char(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned char lsr = serial_inp(up, UART_LSR);
+
+        if (!(lsr & UART_LSR_DR))
+                return NO_POLL_CHAR;
+
+        return serial_inp(up, UART_RX);
+}
+
+
+static void serial8250_put_poll_char(struct uart_port *port,
+                         unsigned char c)
+{
+        unsigned int ier;
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+
+        /*
+         *      First save the IER then disable the interrupts
+         */
+        ier = serial_in(up, UART_IER);
+        if (up->capabilities & UART_CAP_UUE)
+                serial_out(up, UART_IER, UART_IER_UUE);
+        else
+                serial_out(up, UART_IER, 0);
+
+        wait_for_xmitr(up, BOTH_EMPTY);
+        /*
+         *      Send the character out.
+         *      If a LF, also do CR...
+         */
+        serial_out(up, UART_TX, c);
+        if (c == 10) {
+                wait_for_xmitr(up, BOTH_EMPTY);
+                serial_out(up, UART_TX, 13);
+        }
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the IER
+         */
+        wait_for_xmitr(up, BOTH_EMPTY);
+        serial_out(up, UART_IER, ier);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+static int serial8250_startup(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned long flags;
+        unsigned char lsr, iir;
+        int retval;
+
+        up->port.fifosize = uart_config[up->port.type].fifo_size;
+        up->tx_loadsz = uart_config[up->port.type].tx_loadsz;
+        up->capabilities = uart_config[up->port.type].flags;
+        up->mcr = 0;
+
+        if (up->port.iotype != up->cur_iotype)
+                set_io_from_upio(port);
+
+        if (up->port.type == PORT_16C950) {
+                /* Wake up and initialize UART */
+                up->acr = 0;
+                serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
+                serial_outp(up, UART_EFR, UART_EFR_ECB);
+                serial_outp(up, UART_IER, 0);
+                serial_outp(up, UART_LCR, 0);
+                serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
+                serial_outp(up, UART_LCR, 0xBF);
+                serial_outp(up, UART_EFR, UART_EFR_ECB);
+                serial_outp(up, UART_LCR, 0);
+        }
+
+#ifdef CONFIG_SERIAL_8250_RSA
+        /*
+         * If this is an RSA port, see if we can kick it up to the
+         * higher speed clock.
+         */
+        enable_rsa(up);
+#endif
+
+        /*
+         * Clear the FIFO buffers and disable them.
+         * (they will be reenabled in set_termios())
+         */
+        serial8250_clear_fifos(up);
+
+        /*
+         * Clear the interrupt registers.
+         */
+        (void) serial_inp(up, UART_LSR);
+        (void) serial_inp(up, UART_RX);
+        (void) serial_inp(up, UART_IIR);
+        (void) serial_inp(up, UART_MSR);
+
+        /*
+         * At this point, there's no way the LSR could still be 0xff;
+         * if it is, then bail out, because there's likely no UART
+         * here.
+         */
+        if (!(up->port.flags & UPF_BUGGY_UART) &&
+            (serial_inp(up, UART_LSR) == 0xff)) {
+                printk(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
+                       serial_index(&up->port));
+                return -ENODEV;
+        }
+
+        /*
+         * For a XR16C850, we need to set the trigger levels
+         */
+        if (up->port.type == PORT_16850) {
+                unsigned char fctr;
+
+                serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
+                fctr = serial_inp(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX);
+                serial_outp(up, UART_FCTR, fctr | UART_FCTR_TRGD | UART_FCTR_RX);
+                serial_outp(up, UART_TRG, UART_TRG_96);
+                serial_outp(up, UART_FCTR, fctr | UART_FCTR_TRGD | UART_FCTR_TX);
+                serial_outp(up, UART_TRG, UART_TRG_96);
+
+                serial_outp(up, UART_LCR, 0);
+        }
+
+        if (is_real_interrupt(up->port.irq)) {
+                unsigned char iir1;
+                /*
+                 * Test for UARTs that do not reassert THRE when the
+                 * transmitter is idle and the interrupt has already
+                 * been cleared.  Real 16550s should always reassert
+                 * this interrupt whenever the transmitter is idle and
+                 * the interrupt is enabled.  Delays are necessary to
+                 * allow register changes to become visible.
+                 */
+                spin_lock_irqsave(&up->port.lock, flags);
+                if (up->port.irqflags & IRQF_SHARED)
+                        disable_irq_nosync(up->port.irq);
+
+                wait_for_xmitr(up, UART_LSR_THRE);
+                serial_out_sync(up, UART_IER, UART_IER_THRI);
+                udelay(1); /* allow THRE to set */
+                iir1 = serial_in(up, UART_IIR);
+                serial_out(up, UART_IER, 0);
+                serial_out_sync(up, UART_IER, UART_IER_THRI);
+                udelay(1); /* allow a working UART time to re-assert THRE */
+                iir = serial_in(up, UART_IIR);
+                serial_out(up, UART_IER, 0);
+
+                if (up->port.irqflags & IRQF_SHARED)
+                        enable_irq(up->port.irq);
+                spin_unlock_irqrestore(&up->port.lock, flags);
+
+                /*
+                 * If the interrupt is not reasserted, setup a timer to
+                 * kick the UART on a regular basis.
+                 */
+                if (!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) {
+                        up->bugs |= UART_BUG_THRE;
+                        pr_debug("ttyS%d - using backup timer\n",
+                                 serial_index(port));
+                }
+        }
+
+        /*
+         * The above check will only give an accurate result the first time
+         * the port is opened so this value needs to be preserved.
+         */
+        if (up->bugs & UART_BUG_THRE) {
+                up->timer.function = serial8250_backup_timeout;
+                up->timer.data = (unsigned long)up;
+                mod_timer(&up->timer, jiffies +
+                        uart_poll_timeout(port) + HZ / 5);
+        }
+
+        /*
+         * If the "interrupt" for this port doesn't correspond with any
+         * hardware interrupt, we use a timer-based system.  The original
+         * driver used to do this with IRQ0.
+         */
+        if (!is_real_interrupt(up->port.irq)) {
+                up->timer.data = (unsigned long)up;
+                mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
+        } else {
+                retval = serial_link_irq_chain(up);
+                if (retval)
+                        return retval;
+        }
+
+        /*
+         * Now, initialize the UART
+         */
+        serial_outp(up, UART_LCR, UART_LCR_WLEN8);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (up->port.flags & UPF_FOURPORT) {
+                if (!is_real_interrupt(up->port.irq))
+                        up->port.mctrl |= TIOCM_OUT1;
+        } else
+                /*
+                 * Most PC uarts need OUT2 raised to enable interrupts.
+                 */
+                if (is_real_interrupt(up->port.irq))
+                        up->port.mctrl |= TIOCM_OUT2;
+
+        serial8250_set_mctrl(&up->port, up->port.mctrl);
+
+        /* Serial over Lan (SoL) hack:
+           Intel 8257x Gigabit ethernet chips have a
+           16550 emulation, to be used for Serial Over Lan.
+           Those chips take a longer time than a normal
+           serial device to signalize that a transmission
+           data was queued. Due to that, the above test generally
+           fails. One solution would be to delay the reading of
+           iir. However, this is not reliable, since the timeout
+           is variable. So, let's just don't test if we receive
+           TX irq. This way, we'll never enable UART_BUG_TXEN.
+         */
+        if (skip_txen_test || up->port.flags & UPF_NO_TXEN_TEST)
+                goto dont_test_tx_en;
+
+        /*
+         * Do a quick test to see if we receive an
+         * interrupt when we enable the TX irq.
+         */
+        serial_outp(up, UART_IER, UART_IER_THRI);
+        lsr = serial_in(up, UART_LSR);
+        iir = serial_in(up, UART_IIR);
+        serial_outp(up, UART_IER, 0);
+
+        if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) {
+                if (!(up->bugs & UART_BUG_TXEN)) {
+                        up->bugs |= UART_BUG_TXEN;
+                        pr_debug("ttyS%d - enabling bad tx status workarounds\n",
+                                 serial_index(port));
+                }
+        } else {
+                up->bugs &= ~UART_BUG_TXEN;
+        }
+
+dont_test_tx_en:
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Clear the interrupt registers again for luck, and clear the
+         * saved flags to avoid getting false values from polling
+         * routines or the previous session.
+         */
+        serial_inp(up, UART_LSR);
+        serial_inp(up, UART_RX);
+        serial_inp(up, UART_IIR);
+        serial_inp(up, UART_MSR);
+        up->lsr_saved_flags = 0;
+        up->msr_saved_flags = 0;
+
+        /*
+         * Finally, enable interrupts.  Note: Modem status interrupts
+         * are set via set_termios(), which will be occurring imminently
+         * anyway, so we don't enable them here.
+         */
+        up->ier = UART_IER_RLSI | UART_IER_RDI;
+        serial_outp(up, UART_IER, up->ier);
+
+        if (up->port.flags & UPF_FOURPORT) {
+                unsigned int icp;
+                /*
+                 * Enable interrupts on the AST Fourport board
+                 */
+                icp = (up->port.iobase & 0xfe0) | 0x01f;
+                outb_p(0x80, icp);
+                (void) inb_p(icp);
+        }
+
+        return 0;
+}
+
+static void serial8250_shutdown(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned long flags;
+
+        /*
+         * Disable interrupts from this port
+         */
+        up->ier = 0;
+        serial_outp(up, UART_IER, 0);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (up->port.flags & UPF_FOURPORT) {
+                /* reset interrupts on the AST Fourport board */
+                inb((up->port.iobase & 0xfe0) | 0x1f);
+                up->port.mctrl |= TIOCM_OUT1;
+        } else
+                up->port.mctrl &= ~TIOCM_OUT2;
+
+        serial8250_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Disable break condition and FIFOs
+         */
+        serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
+        serial8250_clear_fifos(up);
+
+#ifdef CONFIG_SERIAL_8250_RSA
+        /*
+         * Reset the RSA board back to 115kbps compat mode.
+         */
+        disable_rsa(up);
+#endif
+
+        /*
+         * Read data port to reset things, and then unlink from
+         * the IRQ chain.
+         */
+        (void) serial_in(up, UART_RX);
+
+        del_timer_sync(&up->timer);
+        up->timer.function = serial8250_timeout;
+        if (is_real_interrupt(up->port.irq))
+                serial_unlink_irq_chain(up);
+}
+
+static unsigned int serial8250_get_divisor(struct uart_port *port, unsigned int baud)
+{
+        unsigned int quot;
+
+        /*
+         * Handle magic divisors for baud rates above baud_base on
+         * SMSC SuperIO chips.
+         */
+        if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
+            baud == (port->uartclk/4))
+                quot = 0x8001;
+        else if ((port->flags & UPF_MAGIC_MULTIPLIER) &&
+                 baud == (port->uartclk/8))
+                quot = 0x8002;
+        else
+                quot = uart_get_divisor(port, baud);
+
+        return quot;
+}
+
+void
+serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
+                          struct ktermios *old)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        unsigned char cval, fcr = 0;
+        unsigned long flags;
+        unsigned int baud, quot;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                cval = UART_LCR_WLEN5;
+                break;
+        case CS6:
+                cval = UART_LCR_WLEN6;
+                break;
+        case CS7:
+                cval = UART_LCR_WLEN7;
+                break;
+        default:
+        case CS8:
+                cval = UART_LCR_WLEN8;
+                break;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                cval |= UART_LCR_STOP;
+        if (termios->c_cflag & PARENB)
+                cval |= UART_LCR_PARITY;
+        if (!(termios->c_cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+        if (termios->c_cflag & CMSPAR)
+                cval |= UART_LCR_SPAR;
+#endif
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old,
+                                  port->uartclk / 16 / 0xffff,
+                                  port->uartclk / 16);
+        quot = serial8250_get_divisor(port, baud);
+
+        /*
+         * Oxford Semi 952 rev B workaround
+         */
+        if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0)
+                quot++;
+
+        if (up->capabilities & UART_CAP_FIFO && up->port.fifosize > 1) {
+                if (baud < 2400)
+                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
+                else
+                        fcr = uart_config[up->port.type].fcr;
+        }
+
+        /*
+         * MCR-based auto flow control.  When AFE is enabled, RTS will be
+         * deasserted when the receive FIFO contains more characters than
+         * the trigger, or the MCR RTS bit is cleared.  In the case where
+         * the remote UART is not using CTS auto flow control, we must
+         * have sufficient FIFO entries for the latency of the remote
+         * UART to respond.  IOW, at least 32 bytes of FIFO.
+         */
+        if (up->capabilities & UART_CAP_AFE && up->port.fifosize >= 32) {
+                up->mcr &= ~UART_MCR_AFE;
+                if (termios->c_cflag & CRTSCTS)
+                        up->mcr |= UART_MCR_AFE;
+        }
+
+        /*
+         * Ok, we're now changing the port state.  Do it with
+         * interrupts disabled.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+        if (termios->c_iflag & INPCK)
+                up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= UART_LSR_BI;
+
+        /*
+         * Characteres to ignore
+         */
+        up->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+        if (termios->c_iflag & IGNBRK) {
+                up->port.ignore_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        up->port.ignore_status_mask |= UART_LSR_OE;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= UART_LSR_DR;
+
+        /*
+         * CTS flow control flag and modem status interrupts
+         */
+        up->ier &= ~UART_IER_MSI;
+        if (!(up->bugs & UART_BUG_NOMSR) &&
+                        UART_ENABLE_MS(&up->port, termios->c_cflag))
+                up->ier |= UART_IER_MSI;
+        if (up->capabilities & UART_CAP_UUE)
+                up->ier |= UART_IER_UUE;
+        if (up->capabilities & UART_CAP_RTOIE)
+                up->ier |= UART_IER_RTOIE;
+
+        serial_out(up, UART_IER, up->ier);
+
+        if (up->capabilities & UART_CAP_EFR) {
+                unsigned char efr = 0;
+                /*
+                 * TI16C752/Startech hardware flow control.  FIXME:
+                 * - TI16C752 requires control thresholds to be set.
+                 * - UART_MCR_RTS is ineffective if auto-RTS mode is enabled.
+                 */
+                if (termios->c_cflag & CRTSCTS)
+                        efr |= UART_EFR_CTS;
+
+                serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
+                serial_outp(up, UART_EFR, efr);
+        }
+
+#ifdef CONFIG_ARCH_OMAP
+        /* Workaround to enable 115200 baud on OMAP1510 internal ports */
+        if (cpu_is_omap1510() && is_omap_port(up)) {
+                if (baud == 115200) {
+                        quot = 1;
+                        serial_out(up, UART_OMAP_OSC_12M_SEL, 1);
+                } else
+                        serial_out(up, UART_OMAP_OSC_12M_SEL, 0);
+        }
+#endif
+
+        if (up->capabilities & UART_NATSEMI) {
+                /* Switch to bank 2 not bank 1, to avoid resetting EXCR2 */
+                serial_outp(up, UART_LCR, 0xe0);
+        } else {
+                serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+        }
+
+        serial_dl_write(up, quot);
+
+        /*
+         * LCR DLAB must be set to enable 64-byte FIFO mode. If the FCR
+         * is written without DLAB set, this mode will be disabled.
+         */
+        if (up->port.type == PORT_16750)
+                serial_outp(up, UART_FCR, fcr);
+
+        serial_outp(up, UART_LCR, cval);                /* reset DLAB */
+        up->lcr = cval;                                 /* Save LCR */
+        if (up->port.type != PORT_16750) {
+                if (fcr & UART_FCR_ENABLE_FIFO) {
+                        /* emulated UARTs (Lucent Venus 167x) need two steps */
+                        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+                }
+                serial_outp(up, UART_FCR, fcr);         /* set fcr */
+        }
+        serial8250_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        /* Don't rewrite B0 */
+        if (tty_termios_baud_rate(termios))
+                tty_termios_encode_baud_rate(termios, baud, baud);
+}
+EXPORT_SYMBOL(serial8250_do_set_termios);
+
+static void
+serial8250_set_termios(struct uart_port *port, struct ktermios *termios,
+                       struct ktermios *old)
+{
+        if (port->set_termios)
+                port->set_termios(port, termios, old);
+        else
+                serial8250_do_set_termios(port, termios, old);
+}
+
+static void
+serial8250_set_ldisc(struct uart_port *port, int new)
+{
+        if (new == N_PPS) {
+                port->flags |= UPF_HARDPPS_CD;
+                serial8250_enable_ms(port);
+        } else
+                port->flags &= ~UPF_HARDPPS_CD;
+}
+
+
+void serial8250_do_pm(struct uart_port *port, unsigned int state,
+                      unsigned int oldstate)
+{
+        struct uart_8250_port *p =
+                container_of(port, struct uart_8250_port, port);
+
+        serial8250_set_sleep(p, state != 0);
+}
+EXPORT_SYMBOL(serial8250_do_pm);
+
+static void
+serial8250_pm(struct uart_port *port, unsigned int state,
+              unsigned int oldstate)
+{
+        if (port->pm)
+                port->pm(port, state, oldstate);
+        else
+                serial8250_do_pm(port, state, oldstate);
+}
+
+static unsigned int serial8250_port_size(struct uart_8250_port *pt)
+{
+        if (pt->port.iotype == UPIO_AU)
+                return 0x1000;
+#ifdef CONFIG_ARCH_OMAP
+        if (is_omap_port(pt))
+                return 0x16 << pt->port.regshift;
+#endif
+        return 8 << pt->port.regshift;
+}
+
+/*
+ * Resource handling.
+ */
+static int serial8250_request_std_resource(struct uart_8250_port *up)
+{
+        unsigned int size = serial8250_port_size(up);
+        int ret = 0;
+
+        switch (up->port.iotype) {
+        case UPIO_AU:
+        case UPIO_TSI:
+        case UPIO_MEM32:
+        case UPIO_MEM:
+        case UPIO_DWAPB:
+        case UPIO_DWAPB32:
+                if (!up->port.mapbase)
+                        break;
+
+                if (!request_mem_region(up->port.mapbase, size, "serial")) {
+                        ret = -EBUSY;
+                        break;
+                }
+
+                if (up->port.flags & UPF_IOREMAP) {
+                        up->port.membase = ioremap_nocache(up->port.mapbase,
+                                                                        size);
+                        if (!up->port.membase) {
+                                release_mem_region(up->port.mapbase, size);
+                                ret = -ENOMEM;
+                        }
+                }
+                break;
+
+        case UPIO_HUB6:
+        case UPIO_PORT:
+                if (!request_region(up->port.iobase, size, "serial"))
+                        ret = -EBUSY;
+                break;
+        }
+        return ret;
+}
+
+static void serial8250_release_std_resource(struct uart_8250_port *up)
+{
+        unsigned int size = serial8250_port_size(up);
+
+        switch (up->port.iotype) {
+        case UPIO_AU:
+        case UPIO_TSI:
+        case UPIO_MEM32:
+        case UPIO_MEM:
+        case UPIO_DWAPB:
+        case UPIO_DWAPB32:
+                if (!up->port.mapbase)
+                        break;
+
+                if (up->port.flags & UPF_IOREMAP) {
+                        iounmap(up->port.membase);
+                        up->port.membase = NULL;
+                }
+
+                release_mem_region(up->port.mapbase, size);
+                break;
+
+        case UPIO_HUB6:
+        case UPIO_PORT:
+                release_region(up->port.iobase, size);
+                break;
+        }
+}
+
+static int serial8250_request_rsa_resource(struct uart_8250_port *up)
+{
+        unsigned long start = UART_RSA_BASE << up->port.regshift;
+        unsigned int size = 8 << up->port.regshift;
+        int ret = -EINVAL;
+
+        switch (up->port.iotype) {
+        case UPIO_HUB6:
+        case UPIO_PORT:
+                start += up->port.iobase;
+                if (request_region(start, size, "serial-rsa"))
+                        ret = 0;
+                else
+                        ret = -EBUSY;
+                break;
+        }
+
+        return ret;
+}
+
+static void serial8250_release_rsa_resource(struct uart_8250_port *up)
+{
+        unsigned long offset = UART_RSA_BASE << up->port.regshift;
+        unsigned int size = 8 << up->port.regshift;
+
+        switch (up->port.iotype) {
+        case UPIO_HUB6:
+        case UPIO_PORT:
+                release_region(up->port.iobase + offset, size);
+                break;
+        }
+}
+
+static void serial8250_release_port(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+
+        serial8250_release_std_resource(up);
+        if (up->port.type == PORT_RSA)
+                serial8250_release_rsa_resource(up);
+}
+
+static int serial8250_request_port(struct uart_port *port)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        int ret = 0;
+
+        ret = serial8250_request_std_resource(up);
+        if (ret == 0 && up->port.type == PORT_RSA) {
+                ret = serial8250_request_rsa_resource(up);
+                if (ret < 0)
+                        serial8250_release_std_resource(up);
+        }
+
+        return ret;
+}
+
+static void serial8250_config_port(struct uart_port *port, int flags)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+        int probeflags = PROBE_ANY;
+        int ret;
+
+        /*
+         * Find the region that we can probe for.  This in turn
+         * tells us whether we can probe for the type of port.
+         */
+        ret = serial8250_request_std_resource(up);
+        if (ret < 0)
+                return;
+
+        ret = serial8250_request_rsa_resource(up);
+        if (ret < 0)
+                probeflags &= ~PROBE_RSA;
+
+        if (up->port.iotype != up->cur_iotype)
+                set_io_from_upio(port);
+
+        if (flags & UART_CONFIG_TYPE)
+                autoconfig(up, probeflags);
+
+        /* if access method is AU, it is a 16550 with a quirk */
+        if (up->port.type == PORT_16550A && up->port.iotype == UPIO_AU)
+                up->bugs |= UART_BUG_NOMSR;
+
+        if (up->port.type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ)
+                autoconfig_irq(up);
+
+        if (up->port.type != PORT_RSA && probeflags & PROBE_RSA)
+                serial8250_release_rsa_resource(up);
+        if (up->port.type == PORT_UNKNOWN)
+                serial8250_release_std_resource(up);
+}
+
+static int
+serial8250_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        if (ser->irq >= nr_irqs || ser->irq < 0 ||
+            ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
+            ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS ||
+            ser->type == PORT_STARTECH)
+                return -EINVAL;
+        return 0;
+}
+
+static const char *
+serial8250_type(struct uart_port *port)
+{
+        int type = port->type;
+
+        if (type >= ARRAY_SIZE(uart_config))
+                type = 0;
+        return uart_config[type].name;
+}
+
+static struct uart_ops serial8250_pops = {
+        .tx_empty       = serial8250_tx_empty,
+        .set_mctrl      = serial8250_set_mctrl,
+        .get_mctrl      = serial8250_get_mctrl,
+        .stop_tx        = serial8250_stop_tx,
+        .start_tx       = serial8250_start_tx,
+        .stop_rx        = serial8250_stop_rx,
+        .enable_ms      = serial8250_enable_ms,
+        .break_ctl      = serial8250_break_ctl,
+        .startup        = serial8250_startup,
+        .shutdown       = serial8250_shutdown,
+        .set_termios    = serial8250_set_termios,
+        .set_ldisc      = serial8250_set_ldisc,
+        .pm             = serial8250_pm,
+        .type           = serial8250_type,
+        .release_port   = serial8250_release_port,
+        .request_port   = serial8250_request_port,
+        .config_port    = serial8250_config_port,
+        .verify_port    = serial8250_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char = serial8250_get_poll_char,
+        .poll_put_char = serial8250_put_poll_char,
+#endif
+};
+
+static struct uart_8250_port serial8250_ports[UART_NR];
+
+static void (*serial8250_isa_config)(int port, struct uart_port *up,
+        unsigned short *capabilities);
+
+void serial8250_set_isa_configurator(
+        void (*v)(int port, struct uart_port *up, unsigned short *capabilities))
+{
+        serial8250_isa_config = v;
+}
+EXPORT_SYMBOL(serial8250_set_isa_configurator);
+
+static void __init serial8250_isa_init_ports(void)
+{
+        struct uart_8250_port *up;
+        static int first = 1;
+        int i, irqflag = 0;
+
+        if (!first)
+                return;
+        first = 0;
+
+        for (i = 0; i < nr_uarts; i++) {
+                struct uart_8250_port *up = &serial8250_ports[i];
+
+                up->port.line = i;
+                spin_lock_init(&up->port.lock);
+
+                init_timer(&up->timer);
+                up->timer.function = serial8250_timeout;
+
+                /*
+                 * ALPHA_KLUDGE_MCR needs to be killed.
+                 */
+                up->mcr_mask = ~ALPHA_KLUDGE_MCR;
+                up->mcr_force = ALPHA_KLUDGE_MCR;
+
+                up->port.ops = &serial8250_pops;
+        }
+
+        if (share_irqs)
+                irqflag = IRQF_SHARED;
+
+        for (i = 0, up = serial8250_ports;
+             i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
+             i++, up++) {
+                up->port.iobase   = old_serial_port[i].port;
+                up->port.irq      = irq_canonicalize(old_serial_port[i].irq);
+                up->port.irqflags = old_serial_port[i].irqflags;
+                up->port.uartclk  = old_serial_port[i].baud_base * 16;
+                up->port.flags    = old_serial_port[i].flags;
+                up->port.hub6     = old_serial_port[i].hub6;
+                up->port.membase  = old_serial_port[i].iomem_base;
+                up->port.iotype   = old_serial_port[i].io_type;
+                up->port.regshift = old_serial_port[i].iomem_reg_shift;
+                set_io_from_upio(&up->port);
+                up->port.irqflags |= irqflag;
+                if (serial8250_isa_config != NULL)
+                        serial8250_isa_config(i, &up->port, &up->capabilities);
+
+        }
+}
+
+static void
+serial8250_init_fixed_type_port(struct uart_8250_port *up, unsigned int type)
+{
+        up->port.type = type;
+        up->port.fifosize = uart_config[type].fifo_size;
+        up->capabilities = uart_config[type].flags;
+        up->tx_loadsz = uart_config[type].tx_loadsz;
+}
+
+static void __init
+serial8250_register_ports(struct uart_driver *drv, struct device *dev)
+{
+        int i;
+
+        for (i = 0; i < nr_uarts; i++) {
+                struct uart_8250_port *up = &serial8250_ports[i];
+                up->cur_iotype = 0xFF;
+        }
+
+        serial8250_isa_init_ports();
+
+        for (i = 0; i < nr_uarts; i++) {
+                struct uart_8250_port *up = &serial8250_ports[i];
+
+                up->port.dev = dev;
+
+                if (up->port.flags & UPF_FIXED_TYPE)
+                        serial8250_init_fixed_type_port(up, up->port.type);
+
+                uart_add_one_port(drv, &up->port);
+        }
+}
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+
+static void serial8250_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_8250_port *up =
+                container_of(port, struct uart_8250_port, port);
+
+        wait_for_xmitr(up, UART_LSR_THRE);
+        serial_out(up, UART_TX, ch);
+}
+
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ *
+ *      The console_lock must be held when we get here.
+ */
+static void
+serial8250_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_8250_port *up = &serial8250_ports[co->index];
+        unsigned long flags;
+        unsigned int ier;
+        int locked = 1;
+
+        touch_nmi_watchdog();
+
+        local_irq_save(flags);
+        if (up->port.sysrq) {
+                /* serial8250_handle_port() already took the lock */
+                locked = 0;
+        } else if (oops_in_progress) {
+                locked = spin_trylock(&up->port.lock);
+        } else
+                spin_lock(&up->port.lock);
+
+        /*
+         *      First save the IER then disable the interrupts
+         */
+        ier = serial_in(up, UART_IER);
+
+        if (up->capabilities & UART_CAP_UUE)
+                serial_out(up, UART_IER, UART_IER_UUE);
+        else
+                serial_out(up, UART_IER, 0);
+
+        uart_console_write(&up->port, s, count, serial8250_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the IER
+         */
+        wait_for_xmitr(up, BOTH_EMPTY);
+        serial_out(up, UART_IER, ier);
+
+        /*
+         *      The receive handling will happen properly because the
+         *      receive ready bit will still be set; it is not cleared
+         *      on read.  However, modem control will not, we must
+         *      call it if we have saved something in the saved flags
+         *      while processing with interrupts off.
+         */
+        if (up->msr_saved_flags)
+                check_modem_status(up);
+
+        if (locked)
+                spin_unlock(&up->port.lock);
+        local_irq_restore(flags);
+}
+
+static int __init serial8250_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= nr_uarts)
+                co->index = 0;
+        port = &serial8250_ports[co->index].port;
+        if (!port->iobase && !port->membase)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static int serial8250_console_early_setup(void)
+{
+        return serial8250_find_port_for_earlycon();
+}
+
+static struct console serial8250_console = {
+        .name           = "ttyS",
+        .write          = serial8250_console_write,
+        .device         = uart_console_device,
+        .setup          = serial8250_console_setup,
+        .early_setup    = serial8250_console_early_setup,
+        .flags          = CON_PRINTBUFFER | CON_ANYTIME,
+        .index          = -1,
+        .data           = &serial8250_reg,
+};
+
+static int __init serial8250_console_init(void)
+{
+        if (nr_uarts > UART_NR)
+                nr_uarts = UART_NR;
+
+        serial8250_isa_init_ports();
+        register_console(&serial8250_console);
+        return 0;
+}
+console_initcall(serial8250_console_init);
+
+int serial8250_find_port(struct uart_port *p)
+{
+        int line;
+        struct uart_port *port;
+
+        for (line = 0; line < nr_uarts; line++) {
+                port = &serial8250_ports[line].port;
+                if (uart_match_port(p, port))
+                        return line;
+        }
+        return -ENODEV;
+}
+
+#define SERIAL8250_CONSOLE      &serial8250_console
+#else
+#define SERIAL8250_CONSOLE      NULL
+#endif
+
+static struct uart_driver serial8250_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "serial",
+        .dev_name               = "ttyS",
+        .major                  = TTY_MAJOR,
+        .minor                  = 64,
+        .cons                   = SERIAL8250_CONSOLE,
+};
+
+/*
+ * early_serial_setup - early registration for 8250 ports
+ *
+ * Setup an 8250 port structure prior to console initialisation.  Use
+ * after console initialisation will cause undefined behaviour.
+ */
+int __init early_serial_setup(struct uart_port *port)
+{
+        struct uart_port *p;
+
+        if (port->line >= ARRAY_SIZE(serial8250_ports))
+                return -ENODEV;
+
+        serial8250_isa_init_ports();
+        p = &serial8250_ports[port->line].port;
+        p->iobase       = port->iobase;
+        p->membase      = port->membase;
+        p->irq          = port->irq;
+        p->irqflags     = port->irqflags;
+        p->uartclk      = port->uartclk;
+        p->fifosize     = port->fifosize;
+        p->regshift     = port->regshift;
+        p->iotype       = port->iotype;
+        p->flags        = port->flags;
+        p->mapbase      = port->mapbase;
+        p->private_data = port->private_data;
+        p->type         = port->type;
+        p->line         = port->line;
+
+        set_io_from_upio(p);
+        if (port->serial_in)
+                p->serial_in = port->serial_in;
+        if (port->serial_out)
+                p->serial_out = port->serial_out;
+
+        return 0;
+}
+
+/**
+ *      serial8250_suspend_port - suspend one serial port
+ *      @line:  serial line number
+ *
+ *      Suspend one serial port.
+ */
+void serial8250_suspend_port(int line)
+{
+        uart_suspend_port(&serial8250_reg, &serial8250_ports[line].port);
+}
+
+/**
+ *      serial8250_resume_port - resume one serial port
+ *      @line:  serial line number
+ *
+ *      Resume one serial port.
+ */
+void serial8250_resume_port(int line)
+{
+        struct uart_8250_port *up = &serial8250_ports[line];
+
+        if (up->capabilities & UART_NATSEMI) {
+                /* Ensure it's still in high speed mode */
+                serial_outp(up, UART_LCR, 0xE0);
+
+                ns16550a_goto_highspeed(up);
+
+                serial_outp(up, UART_LCR, 0);
+                up->port.uartclk = 921600*16;
+        }
+        uart_resume_port(&serial8250_reg, &up->port);
+}
+
+/*
+ * Register a set of serial devices attached to a platform device.  The
+ * list is terminated with a zero flags entry, which means we expect
+ * all entries to have at least UPF_BOOT_AUTOCONF set.
+ */
+static int __devinit serial8250_probe(struct platform_device *dev)
+{
+        struct plat_serial8250_port *p = dev->dev.platform_data;
+        struct uart_port port;
+        int ret, i, irqflag = 0;
+
+        memset(&port, 0, sizeof(struct uart_port));
+
+        if (share_irqs)
+                irqflag = IRQF_SHARED;
+
+        for (i = 0; p && p->flags != 0; p++, i++) {
+                port.iobase             = p->iobase;
+                port.membase            = p->membase;
+                port.irq                = p->irq;
+                port.irqflags           = p->irqflags;
+                port.uartclk            = p->uartclk;
+                port.regshift           = p->regshift;
+                port.iotype             = p->iotype;
+                port.flags              = p->flags;
+                port.mapbase            = p->mapbase;
+                port.hub6               = p->hub6;
+                port.private_data       = p->private_data;
+                port.type               = p->type;
+                port.serial_in          = p->serial_in;
+                port.serial_out         = p->serial_out;
+                port.set_termios        = p->set_termios;
+                port.pm                 = p->pm;
+                port.dev                = &dev->dev;
+                port.irqflags           |= irqflag;
+                ret = serial8250_register_port(&port);
+                if (ret < 0) {
+                        dev_err(&dev->dev, "unable to register port at index %d "
+                                "(IO%lx MEM%llx IRQ%d): %d\n", i,
+                                p->iobase, (unsigned long long)p->mapbase,
+                                p->irq, ret);
+                }
+        }
+        return 0;
+}
+
+/*
+ * Remove serial ports registered against a platform device.
+ */
+static int __devexit serial8250_remove(struct platform_device *dev)
+{
+        int i;
+
+        for (i = 0; i < nr_uarts; i++) {
+                struct uart_8250_port *up = &serial8250_ports[i];
+
+                if (up->port.dev == &dev->dev)
+                        serial8250_unregister_port(i);
+        }
+        return 0;
+}
+
+static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_8250_port *up = &serial8250_ports[i];
+
+                if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
+                        uart_suspend_port(&serial8250_reg, &up->port);
+        }
+
+        return 0;
+}
+
+static int serial8250_resume(struct platform_device *dev)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_8250_port *up = &serial8250_ports[i];
+
+                if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
+                        serial8250_resume_port(i);
+        }
+
+        return 0;
+}
+
+static struct platform_driver serial8250_isa_driver = {
+        .probe          = serial8250_probe,
+        .remove         = __devexit_p(serial8250_remove),
+        .suspend        = serial8250_suspend,
+        .resume         = serial8250_resume,
+        .driver         = {
+                .name   = "serial8250",
+                .owner  = THIS_MODULE,
+        },
+};
+
+/*
+ * This "device" covers _all_ ISA 8250-compatible serial devices listed
+ * in the table in include/asm/serial.h
+ */
+static struct platform_device *serial8250_isa_devs;
+
+/*
+ * serial8250_register_port and serial8250_unregister_port allows for
+ * 16x50 serial ports to be configured at run-time, to support PCMCIA
+ * modems and PCI multiport cards.
+ */
+static DEFINE_MUTEX(serial_mutex);
+
+static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *port)
+{
+        int i;
+
+        /*
+         * First, find a port entry which matches.
+         */
+        for (i = 0; i < nr_uarts; i++)
+                if (uart_match_port(&serial8250_ports[i].port, port))
+                        return &serial8250_ports[i];
+
+        /*
+         * We didn't find a matching entry, so look for the first
+         * free entry.  We look for one which hasn't been previously
+         * used (indicated by zero iobase).
+         */
+        for (i = 0; i < nr_uarts; i++)
+                if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
+                    serial8250_ports[i].port.iobase == 0)
+                        return &serial8250_ports[i];
+
+        /*
+         * That also failed.  Last resort is to find any entry which
+         * doesn't have a real port associated with it.
+         */
+        for (i = 0; i < nr_uarts; i++)
+                if (serial8250_ports[i].port.type == PORT_UNKNOWN)
+                        return &serial8250_ports[i];
+
+        return NULL;
+}
+
+/**
+ *      serial8250_register_port - register a serial port
+ *      @port: serial port template
+ *
+ *      Configure the serial port specified by the request. If the
+ *      port exists and is in use, it is hung up and unregistered
+ *      first.
+ *
+ *      The port is then probed and if necessary the IRQ is autodetected
+ *      If this fails an error is returned.
+ *
+ *      On success the port is ready to use and the line number is returned.
+ */
+int serial8250_register_port(struct uart_port *port)
+{
+        struct uart_8250_port *uart;
+        int ret = -ENOSPC;
+
+        if (port->uartclk == 0)
+                return -EINVAL;
+
+        mutex_lock(&serial_mutex);
+
+        uart = serial8250_find_match_or_unused(port);
+        if (uart) {
+                uart_remove_one_port(&serial8250_reg, &uart->port);
+
+                uart->port.iobase       = port->iobase;
+                uart->port.membase      = port->membase;
+                uart->port.irq          = port->irq;
+                uart->port.irqflags     = port->irqflags;
+                uart->port.uartclk      = port->uartclk;
+                uart->port.fifosize     = port->fifosize;
+                uart->port.regshift     = port->regshift;
+                uart->port.iotype       = port->iotype;
+                uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;
+                uart->port.mapbase      = port->mapbase;
+                uart->port.private_data = port->private_data;
+                if (port->dev)
+                        uart->port.dev = port->dev;
+
+                if (port->flags & UPF_FIXED_TYPE)
+                        serial8250_init_fixed_type_port(uart, port->type);
+
+                set_io_from_upio(&uart->port);
+                /* Possibly override default I/O functions.  */
+                if (port->serial_in)
+                        uart->port.serial_in = port->serial_in;
+                if (port->serial_out)
+                        uart->port.serial_out = port->serial_out;
+                /*  Possibly override set_termios call */
+                if (port->set_termios)
+                        uart->port.set_termios = port->set_termios;
+                if (port->pm)
+                        uart->port.pm = port->pm;
+
+                if (serial8250_isa_config != NULL)
+                        serial8250_isa_config(0, &uart->port,
+                                        &uart->capabilities);
+
+                ret = uart_add_one_port(&serial8250_reg, &uart->port);
+                if (ret == 0)
+                        ret = uart->port.line;
+        }
+        mutex_unlock(&serial_mutex);
+
+        return ret;
+}
+EXPORT_SYMBOL(serial8250_register_port);
+
+/**
+ *      serial8250_unregister_port - remove a 16x50 serial port at runtime
+ *      @line: serial line number
+ *
+ *      Remove one serial port.  This may not be called from interrupt
+ *      context.  We hand the port back to the our control.
+ */
+void serial8250_unregister_port(int line)
+{
+        struct uart_8250_port *uart = &serial8250_ports[line];
+
+        mutex_lock(&serial_mutex);
+        uart_remove_one_port(&serial8250_reg, &uart->port);
+        if (serial8250_isa_devs) {
+                uart->port.flags &= ~UPF_BOOT_AUTOCONF;
+                uart->port.type = PORT_UNKNOWN;
+                uart->port.dev = &serial8250_isa_devs->dev;
+                uart->capabilities = uart_config[uart->port.type].flags;
+                uart_add_one_port(&serial8250_reg, &uart->port);
+        } else {
+                uart->port.dev = NULL;
+        }
+        mutex_unlock(&serial_mutex);
+}
+EXPORT_SYMBOL(serial8250_unregister_port);
+
+static int __init serial8250_init(void)
+{
+        int ret;
+
+        if (nr_uarts > UART_NR)
+                nr_uarts = UART_NR;
+
+        printk(KERN_INFO "Serial: 8250/16550 driver, "
+                "%d ports, IRQ sharing %sabled\n", nr_uarts,
+                share_irqs ? "en" : "dis");
+
+#ifdef CONFIG_SPARC
+        ret = sunserial_register_minors(&serial8250_reg, UART_NR);
+#else
+        serial8250_reg.nr = UART_NR;
+        ret = uart_register_driver(&serial8250_reg);
+#endif
+        if (ret)
+                goto out;
+
+        serial8250_isa_devs = platform_device_alloc("serial8250",
+                                                    PLAT8250_DEV_LEGACY);
+        if (!serial8250_isa_devs) {
+                ret = -ENOMEM;
+                goto unreg_uart_drv;
+        }
+
+        ret = platform_device_add(serial8250_isa_devs);
+        if (ret)
+                goto put_dev;
+
+        serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
+
+        ret = platform_driver_register(&serial8250_isa_driver);
+        if (ret == 0)
+                goto out;
+
+        platform_device_del(serial8250_isa_devs);
+put_dev:
+        platform_device_put(serial8250_isa_devs);
+unreg_uart_drv:
+#ifdef CONFIG_SPARC
+        sunserial_unregister_minors(&serial8250_reg, UART_NR);
+#else
+        uart_unregister_driver(&serial8250_reg);
+#endif
+out:
+        return ret;
+}
+
+static void __exit serial8250_exit(void)
+{
+        struct platform_device *isa_dev = serial8250_isa_devs;
+
+        /*
+         * This tells serial8250_unregister_port() not to re-register
+         * the ports (thereby making serial8250_isa_driver permanently
+         * in use.)
+         */
+        serial8250_isa_devs = NULL;
+
+        platform_driver_unregister(&serial8250_isa_driver);
+        platform_device_unregister(isa_dev);
+
+#ifdef CONFIG_SPARC
+        sunserial_unregister_minors(&serial8250_reg, UART_NR);
+#else
+        uart_unregister_driver(&serial8250_reg);
+#endif
+}
+
+module_init(serial8250_init);
+module_exit(serial8250_exit);
+
+EXPORT_SYMBOL(serial8250_suspend_port);
+EXPORT_SYMBOL(serial8250_resume_port);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
+
+module_param(share_irqs, uint, 0644);
+MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices"
+        " (unsafe)");
+
+module_param(nr_uarts, uint, 0644);
+MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
+
+module_param(skip_txen_test, uint, 0644);
+MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
+
+#ifdef CONFIG_SERIAL_8250_RSA
+module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444);
+MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
+#endif
+MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
diff --git a/drivers/tty/serial/8250.h b/drivers/tty/serial/8250.h
new file mode 100644
index 000000000000..6edf4a6a22d4
--- /dev/null
+++ b/drivers/tty/serial/8250.h
@@ -0,0 +1,79 @@
+/*
+ *  Driver for 8250/16550-type serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright (C) 2001 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/serial_8250.h>
+
+struct old_serial_port {
+        unsigned int uart;
+        unsigned int baud_base;
+        unsigned int port;
+        unsigned int irq;
+        unsigned int flags;
+        unsigned char hub6;
+        unsigned char io_type;
+        unsigned char *iomem_base;
+        unsigned short iomem_reg_shift;
+        unsigned long irqflags;
+};
+
+/*
+ * This replaces serial_uart_config in include/linux/serial.h
+ */
+struct serial8250_config {
+        const char      *name;
+        unsigned short  fifo_size;
+        unsigned short  tx_loadsz;
+        unsigned char   fcr;
+        unsigned int    flags;
+};
+
+#define UART_CAP_FIFO   (1 << 8)        /* UART has FIFO */
+#define UART_CAP_EFR    (1 << 9)        /* UART has EFR */
+#define UART_CAP_SLEEP  (1 << 10)       /* UART has IER sleep */
+#define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
+#define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
+#define UART_CAP_RTOIE  (1 << 13)       /* UART needs IER bit 4 set (Xscale, Tegra) */
+
+#define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
+#define UART_BUG_TXEN   (1 << 1)        /* UART has buggy TX IIR status */
+#define UART_BUG_NOMSR  (1 << 2)        /* UART has buggy MSR status bits (Au1x00) */
+#define UART_BUG_THRE   (1 << 3)        /* UART has buggy THRE reassertion */
+
+#define PROBE_RSA       (1 << 0)
+#define PROBE_ANY       (~0)
+
+#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
+
+#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
+#define SERIAL8250_SHARE_IRQS 1
+#else
+#define SERIAL8250_SHARE_IRQS 0
+#endif
+
+#if defined(__alpha__) && !defined(CONFIG_PCI)
+/*
+ * Digital did something really horribly wrong with the OUT1 and OUT2
+ * lines on at least some ALPHA's.  The failure mode is that if either
+ * is cleared, the machine locks up with endless interrupts.
+ */
+#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
+#elif defined(CONFIG_SBC8560)
+/*
+ * WindRiver did something similarly broken on their SBC8560 board. The
+ * UART tristates its IRQ output while OUT2 is clear, but they pulled
+ * the interrupt line _up_ instead of down, so if we register the IRQ
+ * while the UART is in that state, we die in an IRQ storm. */
+#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
+#else
+#define ALPHA_KLUDGE_MCR 0
+#endif
diff --git a/drivers/tty/serial/8250_accent.c b/drivers/tty/serial/8250_accent.c
new file mode 100644
index 000000000000..34b51c651192
--- /dev/null
+++ b/drivers/tty/serial/8250_accent.c
@@ -0,0 +1,45 @@
+/*
+ *  Copyright (C) 2005 Russell King.
+ *  Data taken from include/asm-i386/serial.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+
+#define PORT(_base,_irq)                                \
+        {                                               \
+                .iobase         = _base,                \
+                .irq            = _irq,                 \
+                .uartclk        = 1843200,              \
+                .iotype         = UPIO_PORT,            \
+                .flags          = UPF_BOOT_AUTOCONF,    \
+        }
+
+static struct plat_serial8250_port accent_data[] = {
+        PORT(0x330, 4),
+        PORT(0x338, 4),
+        { },
+};
+
+static struct platform_device accent_device = {
+        .name                   = "serial8250",
+        .id                     = PLAT8250_DEV_ACCENT,
+        .dev                    = {
+                .platform_data  = accent_data,
+        },
+};
+
+static int __init accent_init(void)
+{
+        return platform_device_register(&accent_device);
+}
+
+module_init(accent_init);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("8250 serial probe module for Accent Async cards");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_acorn.c b/drivers/tty/serial/8250_acorn.c
new file mode 100644
index 000000000000..b0ce8c56f1a4
--- /dev/null
+++ b/drivers/tty/serial/8250_acorn.c
@@ -0,0 +1,141 @@
+/*
+ *  linux/drivers/serial/acorn.c
+ *
+ *  Copyright (C) 1996-2003 Russell King.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/tty.h>
+#include <linux/serial_core.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/ecard.h>
+#include <asm/string.h>
+
+#include "8250.h"
+
+#define MAX_PORTS       3
+
+struct serial_card_type {
+        unsigned int    num_ports;
+        unsigned int    uartclk;
+        unsigned int    type;
+        unsigned int    offset[MAX_PORTS];
+};
+
+struct serial_card_info {
+        unsigned int    num_ports;
+        int             ports[MAX_PORTS];
+        void __iomem *vaddr;
+};
+
+static int __devinit
+serial_card_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+        struct serial_card_info *info;
+        struct serial_card_type *type = id->data;
+        struct uart_port port;
+        unsigned long bus_addr;
+        unsigned int i;
+
+        info = kzalloc(sizeof(struct serial_card_info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+
+        info->num_ports = type->num_ports;
+
+        bus_addr = ecard_resource_start(ec, type->type);
+        info->vaddr = ecardm_iomap(ec, type->type, 0, 0);
+        if (!info->vaddr) {
+                kfree(info);
+                return -ENOMEM;
+        }
+
+        ecard_set_drvdata(ec, info);
+
+        memset(&port, 0, sizeof(struct uart_port));
+        port.irq        = ec->irq;
+        port.flags      = UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
+        port.uartclk    = type->uartclk;
+        port.iotype     = UPIO_MEM;
+        port.regshift   = 2;
+        port.dev        = &ec->dev;
+
+        for (i = 0; i < info->num_ports; i ++) {
+                port.membase = info->vaddr + type->offset[i];
+                port.mapbase = bus_addr + type->offset[i];
+
+                info->ports[i] = serial8250_register_port(&port);
+        }
+
+        return 0;
+}
+
+static void __devexit serial_card_remove(struct expansion_card *ec)
+{
+        struct serial_card_info *info = ecard_get_drvdata(ec);
+        int i;
+
+        ecard_set_drvdata(ec, NULL);
+
+        for (i = 0; i < info->num_ports; i++)
+                if (info->ports[i] > 0)
+                        serial8250_unregister_port(info->ports[i]);
+
+        kfree(info);
+}
+
+static struct serial_card_type atomwide_type = {
+        .num_ports      = 3,
+        .uartclk        = 7372800,
+        .type           = ECARD_RES_IOCSLOW,
+        .offset         = { 0x2800, 0x2400, 0x2000 },
+};
+
+static struct serial_card_type serport_type = {
+        .num_ports      = 2,
+        .uartclk        = 3686400,
+        .type           = ECARD_RES_IOCSLOW,
+        .offset         = { 0x2000, 0x2020 },
+};
+
+static const struct ecard_id serial_cids[] = {
+        { MANU_ATOMWIDE,        PROD_ATOMWIDE_3PSERIAL, &atomwide_type  },
+        { MANU_SERPORT,         PROD_SERPORT_DSPORT,    &serport_type   },
+        { 0xffff, 0xffff }
+};
+
+static struct ecard_driver serial_card_driver = {
+        .probe          = serial_card_probe,
+        .remove         = __devexit_p(serial_card_remove),
+        .id_table       = serial_cids,
+        .drv = {
+                .name   = "8250_acorn",
+        },
+};
+
+static int __init serial_card_init(void)
+{
+        return ecard_register_driver(&serial_card_driver);
+}
+
+static void __exit serial_card_exit(void)
+{
+        ecard_remove_driver(&serial_card_driver);
+}
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Acorn 8250-compatible serial port expansion card driver");
+MODULE_LICENSE("GPL");
+
+module_init(serial_card_init);
+module_exit(serial_card_exit);
diff --git a/drivers/tty/serial/8250_boca.c b/drivers/tty/serial/8250_boca.c
new file mode 100644
index 000000000000..d125dc107985
--- /dev/null
+++ b/drivers/tty/serial/8250_boca.c
@@ -0,0 +1,59 @@
+/*
+ *  Copyright (C) 2005 Russell King.
+ *  Data taken from include/asm-i386/serial.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+
+#define PORT(_base,_irq)                                \
+        {                                               \
+                .iobase         = _base,                \
+                .irq            = _irq,                 \
+                .uartclk        = 1843200,              \
+                .iotype         = UPIO_PORT,            \
+                .flags          = UPF_BOOT_AUTOCONF,    \
+        }
+
+static struct plat_serial8250_port boca_data[] = {
+        PORT(0x100, 12),
+        PORT(0x108, 12),
+        PORT(0x110, 12),
+        PORT(0x118, 12),
+        PORT(0x120, 12),
+        PORT(0x128, 12),
+        PORT(0x130, 12),
+        PORT(0x138, 12),
+        PORT(0x140, 12),
+        PORT(0x148, 12),
+        PORT(0x150, 12),
+        PORT(0x158, 12),
+        PORT(0x160, 12),
+        PORT(0x168, 12),
+        PORT(0x170, 12),
+        PORT(0x178, 12),
+        { },
+};
+
+static struct platform_device boca_device = {
+        .name                   = "serial8250",
+        .id                     = PLAT8250_DEV_BOCA,
+        .dev                    = {
+                .platform_data  = boca_data,
+        },
+};
+
+static int __init boca_init(void)
+{
+        return platform_device_register(&boca_device);
+}
+
+module_init(boca_init);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("8250 serial probe module for Boca cards");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_early.c b/drivers/tty/serial/8250_early.c
new file mode 100644
index 000000000000..eaafb98debed
--- /dev/null
+++ b/drivers/tty/serial/8250_early.c
@@ -0,0 +1,287 @@
+/*
+ * Early serial console for 8250/16550 devices
+ *
+ * (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
+ *      Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on the 8250.c serial driver, Copyright (C) 2001 Russell King,
+ * and on early_printk.c by Andi Kleen.
+ *
+ * This is for use before the serial driver has initialized, in
+ * particular, before the UARTs have been discovered and named.
+ * Instead of specifying the console device as, e.g., "ttyS0",
+ * we locate the device directly by its MMIO or I/O port address.
+ *
+ * The user can specify the device directly, e.g.,
+ *      earlycon=uart8250,io,0x3f8,9600n8
+ *      earlycon=uart8250,mmio,0xff5e0000,115200n8
+ *      earlycon=uart8250,mmio32,0xff5e0000,115200n8
+ * or
+ *      console=uart8250,io,0x3f8,9600n8
+ *      console=uart8250,mmio,0xff5e0000,115200n8
+ *      console=uart8250,mmio32,0xff5e0000,115200n8
+ */
+
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+#include <asm/io.h>
+#include <asm/serial.h>
+#ifdef CONFIG_FIX_EARLYCON_MEM
+#include <asm/pgtable.h>
+#include <asm/fixmap.h>
+#endif
+
+struct early_serial8250_device {
+        struct uart_port port;
+        char options[16];               /* e.g., 115200n8 */
+        unsigned int baud;
+};
+
+static struct early_serial8250_device early_device;
+
+static unsigned int __init serial_in(struct uart_port *port, int offset)
+{
+        switch (port->iotype) {
+        case UPIO_MEM:
+                return readb(port->membase + offset);
+        case UPIO_MEM32:
+                return readl(port->membase + (offset << 2));
+        case UPIO_PORT:
+                return inb(port->iobase + offset);
+        default:
+                return 0;
+        }
+}
+
+static void __init serial_out(struct uart_port *port, int offset, int value)
+{
+        switch (port->iotype) {
+        case UPIO_MEM:
+                writeb(value, port->membase + offset);
+                break;
+        case UPIO_MEM32:
+                writel(value, port->membase + (offset << 2));
+                break;
+        case UPIO_PORT:
+                outb(value, port->iobase + offset);
+                break;
+        }
+}
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+static void __init wait_for_xmitr(struct uart_port *port)
+{
+        unsigned int status;
+
+        for (;;) {
+                status = serial_in(port, UART_LSR);
+                if ((status & BOTH_EMPTY) == BOTH_EMPTY)
+                        return;
+                cpu_relax();
+        }
+}
+
+static void __init serial_putc(struct uart_port *port, int c)
+{
+        wait_for_xmitr(port);
+        serial_out(port, UART_TX, c);
+}
+
+static void __init early_serial8250_write(struct console *console,
+                                        const char *s, unsigned int count)
+{
+        struct uart_port *port = &early_device.port;
+        unsigned int ier;
+
+        /* Save the IER and disable interrupts */
+        ier = serial_in(port, UART_IER);
+        serial_out(port, UART_IER, 0);
+
+        uart_console_write(port, s, count, serial_putc);
+
+        /* Wait for transmitter to become empty and restore the IER */
+        wait_for_xmitr(port);
+        serial_out(port, UART_IER, ier);
+}
+
+static unsigned int __init probe_baud(struct uart_port *port)
+{
+        unsigned char lcr, dll, dlm;
+        unsigned int quot;
+
+        lcr = serial_in(port, UART_LCR);
+        serial_out(port, UART_LCR, lcr | UART_LCR_DLAB);
+        dll = serial_in(port, UART_DLL);
+        dlm = serial_in(port, UART_DLM);
+        serial_out(port, UART_LCR, lcr);
+
+        quot = (dlm << 8) | dll;
+        return (port->uartclk / 16) / quot;
+}
+
+static void __init init_port(struct early_serial8250_device *device)
+{
+        struct uart_port *port = &device->port;
+        unsigned int divisor;
+        unsigned char c;
+
+        serial_out(port, UART_LCR, 0x3);        /* 8n1 */
+        serial_out(port, UART_IER, 0);          /* no interrupt */
+        serial_out(port, UART_FCR, 0);          /* no fifo */
+        serial_out(port, UART_MCR, 0x3);        /* DTR + RTS */
+
+        divisor = port->uartclk / (16 * device->baud);
+        c = serial_in(port, UART_LCR);
+        serial_out(port, UART_LCR, c | UART_LCR_DLAB);
+        serial_out(port, UART_DLL, divisor & 0xff);
+        serial_out(port, UART_DLM, (divisor >> 8) & 0xff);
+        serial_out(port, UART_LCR, c & ~UART_LCR_DLAB);
+}
+
+static int __init parse_options(struct early_serial8250_device *device,
+                                                                char *options)
+{
+        struct uart_port *port = &device->port;
+        int mmio, mmio32, length;
+
+        if (!options)
+                return -ENODEV;
+
+        port->uartclk = BASE_BAUD * 16;
+
+        mmio = !strncmp(options, "mmio,", 5);
+        mmio32 = !strncmp(options, "mmio32,", 7);
+        if (mmio || mmio32) {
+                port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
+                port->mapbase = simple_strtoul(options + (mmio ? 5 : 7),
+                                               &options, 0);
+                if (mmio32)
+                        port->regshift = 2;
+#ifdef CONFIG_FIX_EARLYCON_MEM
+                set_fixmap_nocache(FIX_EARLYCON_MEM_BASE,
+                                        port->mapbase & PAGE_MASK);
+                port->membase =
+                        (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
+                port->membase += port->mapbase & ~PAGE_MASK;
+#else
+                port->membase = ioremap_nocache(port->mapbase, 64);
+                if (!port->membase) {
+                        printk(KERN_ERR "%s: Couldn't ioremap 0x%llx\n",
+                                __func__,
+                               (unsigned long long) port->mapbase);
+                        return -ENOMEM;
+                }
+#endif
+        } else if (!strncmp(options, "io,", 3)) {
+                port->iotype = UPIO_PORT;
+                port->iobase = simple_strtoul(options + 3, &options, 0);
+                mmio = 0;
+        } else
+                return -EINVAL;
+
+        options = strchr(options, ',');
+        if (options) {
+                options++;
+                device->baud = simple_strtoul(options, NULL, 0);
+                length = min(strcspn(options, " "), sizeof(device->options));
+                strncpy(device->options, options, length);
+        } else {
+                device->baud = probe_baud(port);
+                snprintf(device->options, sizeof(device->options), "%u",
+                        device->baud);
+        }
+
+        if (mmio || mmio32)
+                printk(KERN_INFO
+                       "Early serial console at MMIO%s 0x%llx (options '%s')\n",
+                        mmio32 ? "32" : "",
+                        (unsigned long long)port->mapbase,
+                        device->options);
+        else
+                printk(KERN_INFO
+                      "Early serial console at I/O port 0x%lx (options '%s')\n",
+                        port->iobase,
+                        device->options);
+
+        return 0;
+}
+
+static struct console early_serial8250_console __initdata = {
+        .name   = "uart",
+        .write  = early_serial8250_write,
+        .flags  = CON_PRINTBUFFER | CON_BOOT,
+        .index  = -1,
+};
+
+static int __init early_serial8250_setup(char *options)
+{
+        struct early_serial8250_device *device = &early_device;
+        int err;
+
+        if (device->port.membase || device->port.iobase)
+                return 0;
+
+        err = parse_options(device, options);
+        if (err < 0)
+                return err;
+
+        init_port(device);
+        return 0;
+}
+
+int __init setup_early_serial8250_console(char *cmdline)
+{
+        char *options;
+        int err;
+
+        options = strstr(cmdline, "uart8250,");
+        if (!options) {
+                options = strstr(cmdline, "uart,");
+                if (!options)
+                        return 0;
+        }
+
+        options = strchr(cmdline, ',') + 1;
+        err = early_serial8250_setup(options);
+        if (err < 0)
+                return err;
+
+        register_console(&early_serial8250_console);
+
+        return 0;
+}
+
+int serial8250_find_port_for_earlycon(void)
+{
+        struct early_serial8250_device *device = &early_device;
+        struct uart_port *port = &device->port;
+        int line;
+        int ret;
+
+        if (!device->port.membase && !device->port.iobase)
+                return -ENODEV;
+
+        line = serial8250_find_port(port);
+        if (line < 0)
+                return -ENODEV;
+
+        ret = update_console_cmdline("uart", 8250,
+                             "ttyS", line, device->options);
+        if (ret < 0)
+                ret = update_console_cmdline("uart", 0,
+                                     "ttyS", line, device->options);
+
+        return ret;
+}
+
+early_param("earlycon", setup_early_serial8250_console);
diff --git a/drivers/tty/serial/8250_exar_st16c554.c b/drivers/tty/serial/8250_exar_st16c554.c
new file mode 100644
index 000000000000..bf53aabf9b5e
--- /dev/null
+++ b/drivers/tty/serial/8250_exar_st16c554.c
@@ -0,0 +1,50 @@
+/*
+ *  Written by Paul B Schroeder < pschroeder "at" uplogix "dot" com >
+ *  Based on 8250_boca.
+ *
+ *  Copyright (C) 2005 Russell King.
+ *  Data taken from include/asm-i386/serial.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+
+#define PORT(_base,_irq)                                \
+        {                                               \
+                .iobase         = _base,                \
+                .irq            = _irq,                 \
+                .uartclk        = 1843200,              \
+                .iotype         = UPIO_PORT,            \
+                .flags          = UPF_BOOT_AUTOCONF,    \
+        }
+
+static struct plat_serial8250_port exar_data[] = {
+        PORT(0x100, 5),
+        PORT(0x108, 5),
+        PORT(0x110, 5),
+        PORT(0x118, 5),
+        { },
+};
+
+static struct platform_device exar_device = {
+        .name                   = "serial8250",
+        .id                     = PLAT8250_DEV_EXAR_ST16C554,
+        .dev                    = {
+                .platform_data  = exar_data,
+        },
+};
+
+static int __init exar_init(void)
+{
+        return platform_device_register(&exar_device);
+}
+
+module_init(exar_init);
+
+MODULE_AUTHOR("Paul B Schroeder");
+MODULE_DESCRIPTION("8250 serial probe module for Exar cards");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_fourport.c b/drivers/tty/serial/8250_fourport.c
new file mode 100644
index 000000000000..be1582609626
--- /dev/null
+++ b/drivers/tty/serial/8250_fourport.c
@@ -0,0 +1,51 @@
+/*
+ *  Copyright (C) 2005 Russell King.
+ *  Data taken from include/asm-i386/serial.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+
+#define PORT(_base,_irq)                                                \
+        {                                                               \
+                .iobase         = _base,                                \
+                .irq            = _irq,                                 \
+                .uartclk        = 1843200,                              \
+                .iotype         = UPIO_PORT,                            \
+                .flags          = UPF_BOOT_AUTOCONF | UPF_FOURPORT,     \
+        }
+
+static struct plat_serial8250_port fourport_data[] = {
+        PORT(0x1a0, 9),
+        PORT(0x1a8, 9),
+        PORT(0x1b0, 9),
+        PORT(0x1b8, 9),
+        PORT(0x2a0, 5),
+        PORT(0x2a8, 5),
+        PORT(0x2b0, 5),
+        PORT(0x2b8, 5),
+        { },
+};
+
+static struct platform_device fourport_device = {
+        .name                   = "serial8250",
+        .id                     = PLAT8250_DEV_FOURPORT,
+        .dev                    = {
+                .platform_data  = fourport_data,
+        },
+};
+
+static int __init fourport_init(void)
+{
+        return platform_device_register(&fourport_device);
+}
+
+module_init(fourport_init);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("8250 serial probe module for AST Fourport cards");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_gsc.c b/drivers/tty/serial/8250_gsc.c
new file mode 100644
index 000000000000..d8c0ffbfa6e3
--- /dev/null
+++ b/drivers/tty/serial/8250_gsc.c
@@ -0,0 +1,122 @@
+/*
+ *      Serial Device Initialisation for Lasi/Asp/Wax/Dino
+ *
+ *      (c) Copyright Matthew Wilcox <willy@debian.org> 2001-2002
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ */
+
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/serial_core.h>
+#include <linux/signal.h>
+#include <linux/types.h>
+
+#include <asm/hardware.h>
+#include <asm/parisc-device.h>
+#include <asm/io.h>
+
+#include "8250.h"
+
+static int __init serial_init_chip(struct parisc_device *dev)
+{
+        struct uart_port port;
+        unsigned long address;
+        int err;
+
+        if (!dev->irq) {
+                /* We find some unattached serial ports by walking native
+                 * busses.  These should be silently ignored.  Otherwise,
+                 * what we have here is a missing parent device, so tell
+                 * the user what they're missing.
+                 */
+                if (parisc_parent(dev)->id.hw_type != HPHW_IOA)
+                        printk(KERN_INFO
+                                "Serial: device 0x%llx not configured.\n"
+                                "Enable support for Wax, Lasi, Asp or Dino.\n",
+                                (unsigned long long)dev->hpa.start);
+                return -ENODEV;
+        }
+
+        address = dev->hpa.start;
+        if (dev->id.sversion != 0x8d)
+                address += 0x800;
+
+        memset(&port, 0, sizeof(port));
+        port.iotype     = UPIO_MEM;
+        /* 7.272727MHz on Lasi.  Assumed the same for Dino, Wax and Timi. */
+        port.uartclk    = 7272727;
+        port.mapbase    = address;
+        port.membase    = ioremap_nocache(address, 16);
+        port.irq        = dev->irq;
+        port.flags      = UPF_BOOT_AUTOCONF;
+        port.dev        = &dev->dev;
+
+        err = serial8250_register_port(&port);
+        if (err < 0) {
+                printk(KERN_WARNING
+                        "serial8250_register_port returned error %d\n", err);
+                iounmap(port.membase);
+                return err;
+        }
+
+        return 0;
+}
+
+static struct parisc_device_id serial_tbl[] = {
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00075 },
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008c },
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008d },
+        { 0 }
+};
+
+/* Hack.  Some machines have SERIAL_0 attached to Lasi and SERIAL_1
+ * attached to Dino.  Unfortunately, Dino appears before Lasi in the device
+ * tree.  To ensure that ttyS0 == SERIAL_0, we register two drivers; one
+ * which only knows about Lasi and then a second which will find all the
+ * other serial ports.  HPUX ignores this problem.
+ */
+static struct parisc_device_id lasi_tbl[] = {
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03B, 0x0008C }, /* C1xx/C1xxL */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03C, 0x0008C }, /* B132L */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03D, 0x0008C }, /* B160L */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03E, 0x0008C }, /* B132L+ */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x03F, 0x0008C }, /* B180L+ */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x046, 0x0008C }, /* Rocky2 120 */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x047, 0x0008C }, /* Rocky2 150 */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x04E, 0x0008C }, /* Kiji L2 132 */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, 0x056, 0x0008C }, /* Raven+ */
+        { 0 }
+};
+
+
+MODULE_DEVICE_TABLE(parisc, serial_tbl);
+
+static struct parisc_driver lasi_driver = {
+        .name           = "serial_1",
+        .id_table       = lasi_tbl,
+        .probe          = serial_init_chip,
+};
+
+static struct parisc_driver serial_driver = {
+        .name           = "serial",
+        .id_table       = serial_tbl,
+        .probe          = serial_init_chip,
+};
+
+static int __init probe_serial_gsc(void)
+{
+        register_parisc_driver(&lasi_driver);
+        register_parisc_driver(&serial_driver);
+        return 0;
+}
+
+module_init(probe_serial_gsc);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_hp300.c b/drivers/tty/serial/8250_hp300.c
new file mode 100644
index 000000000000..c13438c93012
--- /dev/null
+++ b/drivers/tty/serial/8250_hp300.c
@@ -0,0 +1,327 @@
+/*
+ * Driver for the 98626/98644/internal serial interface on hp300/hp400
+ * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
+ *
+ * Ported from 2.2 and modified to use the normal 8250 driver
+ * by Kars de Jong <jongk@linux-m68k.org>, May 2004.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+#include <linux/delay.h>
+#include <linux/dio.h>
+#include <linux/console.h>
+#include <linux/slab.h>
+#include <asm/io.h>
+
+#include "8250.h"
+
+#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
+#warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
+#endif
+
+#ifdef CONFIG_HPAPCI
+struct hp300_port
+{
+        struct hp300_port *next;        /* next port */
+        int line;                       /* line (tty) number */
+};
+
+static struct hp300_port *hp300_ports;
+#endif
+
+#ifdef CONFIG_HPDCA
+
+static int __devinit hpdca_init_one(struct dio_dev *d,
+                                        const struct dio_device_id *ent);
+static void __devexit hpdca_remove_one(struct dio_dev *d);
+
+static struct dio_device_id hpdca_dio_tbl[] = {
+        { DIO_ID_DCA0 },
+        { DIO_ID_DCA0REM },
+        { DIO_ID_DCA1 },
+        { DIO_ID_DCA1REM },
+        { 0 }
+};
+
+static struct dio_driver hpdca_driver = {
+        .name      = "hpdca",
+        .id_table  = hpdca_dio_tbl,
+        .probe     = hpdca_init_one,
+        .remove    = __devexit_p(hpdca_remove_one),
+};
+
+#endif
+
+static unsigned int num_ports;
+
+extern int hp300_uart_scode;
+
+/* Offset to UART registers from base of DCA */
+#define UART_OFFSET     17
+
+#define DCA_ID          0x01    /* ID (read), reset (write) */
+#define DCA_IC          0x03    /* Interrupt control        */
+
+/* Interrupt control */
+#define DCA_IC_IE       0x80    /* Master interrupt enable  */
+
+#define HPDCA_BAUD_BASE 153600
+
+/* Base address of the Frodo part */
+#define FRODO_BASE      (0x41c000)
+
+/*
+ * Where we find the 8250-like APCI ports, and how far apart they are.
+ */
+#define FRODO_APCIBASE          0x0
+#define FRODO_APCISPACE         0x20
+#define FRODO_APCI_OFFSET(x)    (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
+
+#define HPAPCI_BAUD_BASE 500400
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+/*
+ * Parse the bootinfo to find descriptions for headless console and
+ * debug serial ports and register them with the 8250 driver.
+ * This function should be called before serial_console_init() is called
+ * to make sure the serial console will be available for use. IA-64 kernel
+ * calls this function from setup_arch() after the EFI and ACPI tables have
+ * been parsed.
+ */
+int __init hp300_setup_serial_console(void)
+{
+        int scode;
+        struct uart_port port;
+
+        memset(&port, 0, sizeof(port));
+
+        if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
+                return 0;
+
+        if (DIO_SCINHOLE(hp300_uart_scode))
+                return 0;
+
+        scode = hp300_uart_scode;
+
+        /* Memory mapped I/O */
+        port.iotype = UPIO_MEM;
+        port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
+        port.type = PORT_UNKNOWN;
+
+        /* Check for APCI console */
+        if (scode == 256) {
+#ifdef CONFIG_HPAPCI
+                printk(KERN_INFO "Serial console is HP APCI 1\n");
+
+                port.uartclk = HPAPCI_BAUD_BASE * 16;
+                port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
+                port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
+                port.regshift = 2;
+                add_preferred_console("ttyS", port.line, "9600n8");
+#else
+                printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
+                return 0;
+#endif
+        } else {
+#ifdef CONFIG_HPDCA
+                unsigned long pa = dio_scodetophysaddr(scode);
+                if (!pa)
+                        return 0;
+
+                printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
+
+                port.uartclk = HPDCA_BAUD_BASE * 16;
+                port.mapbase = (pa + UART_OFFSET);
+                port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
+                port.regshift = 1;
+                port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
+
+                /* Enable board-interrupts */
+                out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
+
+                if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
+                        add_preferred_console("ttyS", port.line, "9600n8");
+#else
+                printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
+                return 0;
+#endif
+        }
+
+        if (early_serial_setup(&port) < 0)
+                printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
+        return 0;
+}
+#endif /* CONFIG_SERIAL_8250_CONSOLE */
+
+#ifdef CONFIG_HPDCA
+static int __devinit hpdca_init_one(struct dio_dev *d,
+                                const struct dio_device_id *ent)
+{
+        struct uart_port port;
+        int line;
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+        if (hp300_uart_scode == d->scode) {
+                /* Already got it. */
+                return 0;
+        }
+#endif
+        memset(&port, 0, sizeof(struct uart_port));
+
+        /* Memory mapped I/O */
+        port.iotype = UPIO_MEM;
+        port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
+        port.irq = d->ipl;
+        port.uartclk = HPDCA_BAUD_BASE * 16;
+        port.mapbase = (d->resource.start + UART_OFFSET);
+        port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
+        port.regshift = 1;
+        port.dev = &d->dev;
+        line = serial8250_register_port(&port);
+
+        if (line < 0) {
+                printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
+                       " irq %d failed\n", d->scode, port.irq);
+                return -ENOMEM;
+        }
+
+        /* Enable board-interrupts */
+        out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
+        dio_set_drvdata(d, (void *)line);
+
+        /* Reset the DCA */
+        out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
+        udelay(100);
+
+        num_ports++;
+
+        return 0;
+}
+#endif
+
+static int __init hp300_8250_init(void)
+{
+        static int called;
+#ifdef CONFIG_HPAPCI
+        int line;
+        unsigned long base;
+        struct uart_port uport;
+        struct hp300_port *port;
+        int i;
+#endif
+        if (called)
+                return -ENODEV;
+        called = 1;
+
+        if (!MACH_IS_HP300)
+                return -ENODEV;
+
+#ifdef CONFIG_HPDCA
+        dio_register_driver(&hpdca_driver);
+#endif
+#ifdef CONFIG_HPAPCI
+        if (hp300_model < HP_400) {
+                if (!num_ports)
+                        return -ENODEV;
+                return 0;
+        }
+        /* These models have the Frodo chip.
+         * Port 0 is reserved for the Apollo Domain keyboard.
+         * Port 1 is either the console or the DCA.
+         */
+        for (i = 1; i < 4; i++) {
+                /* Port 1 is the console on a 425e, on other machines it's
+                 * mapped to DCA.
+                 */
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+                if (i == 1)
+                        continue;
+#endif
+
+                /* Create new serial device */
+                port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
+                if (!port)
+                        return -ENOMEM;
+
+                memset(&uport, 0, sizeof(struct uart_port));
+
+                base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
+
+                /* Memory mapped I/O */
+                uport.iotype = UPIO_MEM;
+                uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
+                              | UPF_BOOT_AUTOCONF;
+                /* XXX - no interrupt support yet */
+                uport.irq = 0;
+                uport.uartclk = HPAPCI_BAUD_BASE * 16;
+                uport.mapbase = base;
+                uport.membase = (char *)(base + DIO_VIRADDRBASE);
+                uport.regshift = 2;
+
+                line = serial8250_register_port(&uport);
+
+                if (line < 0) {
+                        printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
+                               " %d irq %d failed\n", i, uport.irq);
+                        kfree(port);
+                        continue;
+                }
+
+                port->line = line;
+                port->next = hp300_ports;
+                hp300_ports = port;
+
+                num_ports++;
+        }
+#endif
+
+        /* Any boards found? */
+        if (!num_ports)
+                return -ENODEV;
+
+        return 0;
+}
+
+#ifdef CONFIG_HPDCA
+static void __devexit hpdca_remove_one(struct dio_dev *d)
+{
+        int line;
+
+        line = (int) dio_get_drvdata(d);
+        if (d->resource.start) {
+                /* Disable board-interrupts */
+                out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
+        }
+        serial8250_unregister_port(line);
+}
+#endif
+
+static void __exit hp300_8250_exit(void)
+{
+#ifdef CONFIG_HPAPCI
+        struct hp300_port *port, *to_free;
+
+        for (port = hp300_ports; port; ) {
+                serial8250_unregister_port(port->line);
+                to_free = port;
+                port = port->next;
+                kfree(to_free);
+        }
+
+        hp300_ports = NULL;
+#endif
+#ifdef CONFIG_HPDCA
+        dio_unregister_driver(&hpdca_driver);
+#endif
+}
+
+module_init(hp300_8250_init);
+module_exit(hp300_8250_exit);
+MODULE_DESCRIPTION("HP DCA/APCI serial driver");
+MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_hub6.c b/drivers/tty/serial/8250_hub6.c
new file mode 100644
index 000000000000..a5c778e83de0
--- /dev/null
+++ b/drivers/tty/serial/8250_hub6.c
@@ -0,0 +1,56 @@
+/*
+ *  Copyright (C) 2005 Russell King.
+ *  Data taken from include/asm-i386/serial.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+
+#define HUB6(card,port)                                                 \
+        {                                                               \
+                .iobase         = 0x302,                                \
+                .irq            = 3,                                    \
+                .uartclk        = 1843200,                              \
+                .iotype         = UPIO_HUB6,                            \
+                .flags          = UPF_BOOT_AUTOCONF,                    \
+                .hub6           = (card) << 6 | (port) << 3 | 1,        \
+        }
+
+static struct plat_serial8250_port hub6_data[] = {
+        HUB6(0, 0),
+        HUB6(0, 1),
+        HUB6(0, 2),
+        HUB6(0, 3),
+        HUB6(0, 4),
+        HUB6(0, 5),
+        HUB6(1, 0),
+        HUB6(1, 1),
+        HUB6(1, 2),
+        HUB6(1, 3),
+        HUB6(1, 4),
+        HUB6(1, 5),
+        { },
+};
+
+static struct platform_device hub6_device = {
+        .name                   = "serial8250",
+        .id                     = PLAT8250_DEV_HUB6,
+        .dev                    = {
+                .platform_data  = hub6_data,
+        },
+};
+
+static int __init hub6_init(void)
+{
+        return platform_device_register(&hub6_device);
+}
+
+module_init(hub6_init);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("8250 serial probe module for Hub6 cards");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_mca.c b/drivers/tty/serial/8250_mca.c
new file mode 100644
index 000000000000..d20abf04541e
--- /dev/null
+++ b/drivers/tty/serial/8250_mca.c
@@ -0,0 +1,61 @@
+/*
+ *  Copyright (C) 2005 Russell King.
+ *  Data taken from include/asm-i386/serial.h
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mca.h>
+#include <linux/serial_8250.h>
+
+/*
+ * FIXME: Should we be doing AUTO_IRQ here?
+ */
+#ifdef CONFIG_SERIAL_8250_DETECT_IRQ
+#define MCA_FLAGS       UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_AUTO_IRQ
+#else
+#define MCA_FLAGS       UPF_BOOT_AUTOCONF | UPF_SKIP_TEST
+#endif
+
+#define PORT(_base,_irq)                        \
+        {                                       \
+                .iobase         = _base,        \
+                .irq            = _irq,         \
+                .uartclk        = 1843200,      \
+                .iotype         = UPIO_PORT,    \
+                .flags          = MCA_FLAGS,    \
+        }
+
+static struct plat_serial8250_port mca_data[] = {
+        PORT(0x3220, 3),
+        PORT(0x3228, 3),
+        PORT(0x4220, 3),
+        PORT(0x4228, 3),
+        PORT(0x5220, 3),
+        PORT(0x5228, 3),
+        { },
+};
+
+static struct platform_device mca_device = {
+        .name                   = "serial8250",
+        .id                     = PLAT8250_DEV_MCA,
+        .dev                    = {
+                .platform_data  = mca_data,
+        },
+};
+
+static int __init mca_init(void)
+{
+        if (!MCA_bus)
+                return -ENODEV;
+        return platform_device_register(&mca_device);
+}
+
+module_init(mca_init);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("8250 serial probe module for MCA ports");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250_pci.c b/drivers/tty/serial/8250_pci.c
new file mode 100644
index 000000000000..f41b4259ecdd
--- /dev/null
+++ b/drivers/tty/serial/8250_pci.c
@@ -0,0 +1,3956 @@
+/*
+ *  Probe module for 8250/16550-type PCI serial ports.
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright (C) 2001 Russell King, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/tty.h>
+#include <linux/serial_core.h>
+#include <linux/8250_pci.h>
+#include <linux/bitops.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+
+#include "8250.h"
+
+#undef SERIAL_DEBUG_PCI
+
+/*
+ * init function returns:
+ *  > 0 - number of ports
+ *  = 0 - use board->num_ports
+ *  < 0 - error
+ */
+struct pci_serial_quirk {
+        u32     vendor;
+        u32     device;
+        u32     subvendor;
+        u32     subdevice;
+        int     (*init)(struct pci_dev *dev);
+        int     (*setup)(struct serial_private *,
+                         const struct pciserial_board *,
+                         struct uart_port *, int);
+        void    (*exit)(struct pci_dev *dev);
+};
+
+#define PCI_NUM_BAR_RESOURCES   6
+
+struct serial_private {
+        struct pci_dev          *dev;
+        unsigned int            nr;
+        void __iomem            *remapped_bar[PCI_NUM_BAR_RESOURCES];
+        struct pci_serial_quirk *quirk;
+        int                     line[0];
+};
+
+static void moan_device(const char *str, struct pci_dev *dev)
+{
+        printk(KERN_WARNING
+               "%s: %s\n"
+               "Please send the output of lspci -vv, this\n"
+               "message (0x%04x,0x%04x,0x%04x,0x%04x), the\n"
+               "manufacturer and name of serial board or\n"
+               "modem board to rmk+serial@arm.linux.org.uk.\n",
+               pci_name(dev), str, dev->vendor, dev->device,
+               dev->subsystem_vendor, dev->subsystem_device);
+}
+
+static int
+setup_port(struct serial_private *priv, struct uart_port *port,
+           int bar, int offset, int regshift)
+{
+        struct pci_dev *dev = priv->dev;
+        unsigned long base, len;
+
+        if (bar >= PCI_NUM_BAR_RESOURCES)
+                return -EINVAL;
+
+        base = pci_resource_start(dev, bar);
+
+        if (pci_resource_flags(dev, bar) & IORESOURCE_MEM) {
+                len =  pci_resource_len(dev, bar);
+
+                if (!priv->remapped_bar[bar])
+                        priv->remapped_bar[bar] = ioremap_nocache(base, len);
+                if (!priv->remapped_bar[bar])
+                        return -ENOMEM;
+
+                port->iotype = UPIO_MEM;
+                port->iobase = 0;
+                port->mapbase = base + offset;
+                port->membase = priv->remapped_bar[bar] + offset;
+                port->regshift = regshift;
+        } else {
+                port->iotype = UPIO_PORT;
+                port->iobase = base + offset;
+                port->mapbase = 0;
+                port->membase = NULL;
+                port->regshift = 0;
+        }
+        return 0;
+}
+
+/*
+ * ADDI-DATA GmbH communication cards <info@addi-data.com>
+ */
+static int addidata_apci7800_setup(struct serial_private *priv,
+                                const struct pciserial_board *board,
+                                struct uart_port *port, int idx)
+{
+        unsigned int bar = 0, offset = board->first_offset;
+        bar = FL_GET_BASE(board->flags);
+
+        if (idx < 2) {
+                offset += idx * board->uart_offset;
+        } else if ((idx >= 2) && (idx < 4)) {
+                bar += 1;
+                offset += ((idx - 2) * board->uart_offset);
+        } else if ((idx >= 4) && (idx < 6)) {
+                bar += 2;
+                offset += ((idx - 4) * board->uart_offset);
+        } else if (idx >= 6) {
+                bar += 3;
+                offset += ((idx - 6) * board->uart_offset);
+        }
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+/*
+ * AFAVLAB uses a different mixture of BARs and offsets
+ * Not that ugly ;) -- HW
+ */
+static int
+afavlab_setup(struct serial_private *priv, const struct pciserial_board *board,
+              struct uart_port *port, int idx)
+{
+        unsigned int bar, offset = board->first_offset;
+
+        bar = FL_GET_BASE(board->flags);
+        if (idx < 4)
+                bar += idx;
+        else {
+                bar = 4;
+                offset += (idx - 4) * board->uart_offset;
+        }
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+/*
+ * HP's Remote Management Console.  The Diva chip came in several
+ * different versions.  N-class, L2000 and A500 have two Diva chips, each
+ * with 3 UARTs (the third UART on the second chip is unused).  Superdome
+ * and Keystone have one Diva chip with 3 UARTs.  Some later machines have
+ * one Diva chip, but it has been expanded to 5 UARTs.
+ */
+static int pci_hp_diva_init(struct pci_dev *dev)
+{
+        int rc = 0;
+
+        switch (dev->subsystem_device) {
+        case PCI_DEVICE_ID_HP_DIVA_TOSCA1:
+        case PCI_DEVICE_ID_HP_DIVA_HALFDOME:
+        case PCI_DEVICE_ID_HP_DIVA_KEYSTONE:
+        case PCI_DEVICE_ID_HP_DIVA_EVEREST:
+                rc = 3;
+                break;
+        case PCI_DEVICE_ID_HP_DIVA_TOSCA2:
+                rc = 2;
+                break;
+        case PCI_DEVICE_ID_HP_DIVA_MAESTRO:
+                rc = 4;
+                break;
+        case PCI_DEVICE_ID_HP_DIVA_POWERBAR:
+        case PCI_DEVICE_ID_HP_DIVA_HURRICANE:
+                rc = 1;
+                break;
+        }
+
+        return rc;
+}
+
+/*
+ * HP's Diva chip puts the 4th/5th serial port further out, and
+ * some serial ports are supposed to be hidden on certain models.
+ */
+static int
+pci_hp_diva_setup(struct serial_private *priv,
+                const struct pciserial_board *board,
+                struct uart_port *port, int idx)
+{
+        unsigned int offset = board->first_offset;
+        unsigned int bar = FL_GET_BASE(board->flags);
+
+        switch (priv->dev->subsystem_device) {
+        case PCI_DEVICE_ID_HP_DIVA_MAESTRO:
+                if (idx == 3)
+                        idx++;
+                break;
+        case PCI_DEVICE_ID_HP_DIVA_EVEREST:
+                if (idx > 0)
+                        idx++;
+                if (idx > 2)
+                        idx++;
+                break;
+        }
+        if (idx > 2)
+                offset = 0x18;
+
+        offset += idx * board->uart_offset;
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+/*
+ * Added for EKF Intel i960 serial boards
+ */
+static int pci_inteli960ni_init(struct pci_dev *dev)
+{
+        unsigned long oldval;
+
+        if (!(dev->subsystem_device & 0x1000))
+                return -ENODEV;
+
+        /* is firmware started? */
+        pci_read_config_dword(dev, 0x44, (void *)&oldval);
+        if (oldval == 0x00001000L) { /* RESET value */
+                printk(KERN_DEBUG "Local i960 firmware missing");
+                return -ENODEV;
+        }
+        return 0;
+}
+
+/*
+ * Some PCI serial cards using the PLX 9050 PCI interface chip require
+ * that the card interrupt be explicitly enabled or disabled.  This
+ * seems to be mainly needed on card using the PLX which also use I/O
+ * mapped memory.
+ */
+static int pci_plx9050_init(struct pci_dev *dev)
+{
+        u8 irq_config;
+        void __iomem *p;
+
+        if ((pci_resource_flags(dev, 0) & IORESOURCE_MEM) == 0) {
+                moan_device("no memory in bar 0", dev);
+                return 0;
+        }
+
+        irq_config = 0x41;
+        if (dev->vendor == PCI_VENDOR_ID_PANACOM ||
+            dev->subsystem_vendor == PCI_SUBVENDOR_ID_EXSYS)
+                irq_config = 0x43;
+
+        if ((dev->vendor == PCI_VENDOR_ID_PLX) &&
+            (dev->device == PCI_DEVICE_ID_PLX_ROMULUS))
+                /*
+                 * As the megawolf cards have the int pins active
+                 * high, and have 2 UART chips, both ints must be
+                 * enabled on the 9050. Also, the UARTS are set in
+                 * 16450 mode by default, so we have to enable the
+                 * 16C950 'enhanced' mode so that we can use the
+                 * deep FIFOs
+                 */
+                irq_config = 0x5b;
+        /*
+         * enable/disable interrupts
+         */
+        p = ioremap_nocache(pci_resource_start(dev, 0), 0x80);
+        if (p == NULL)
+                return -ENOMEM;
+        writel(irq_config, p + 0x4c);
+
+        /*
+         * Read the register back to ensure that it took effect.
+         */
+        readl(p + 0x4c);
+        iounmap(p);
+
+        return 0;
+}
+
+static void __devexit pci_plx9050_exit(struct pci_dev *dev)
+{
+        u8 __iomem *p;
+
+        if ((pci_resource_flags(dev, 0) & IORESOURCE_MEM) == 0)
+                return;
+
+        /*
+         * disable interrupts
+         */
+        p = ioremap_nocache(pci_resource_start(dev, 0), 0x80);
+        if (p != NULL) {
+                writel(0, p + 0x4c);
+
+                /*
+                 * Read the register back to ensure that it took effect.
+                 */
+                readl(p + 0x4c);
+                iounmap(p);
+        }
+}
+
+#define NI8420_INT_ENABLE_REG   0x38
+#define NI8420_INT_ENABLE_BIT   0x2000
+
+static void __devexit pci_ni8420_exit(struct pci_dev *dev)
+{
+        void __iomem *p;
+        unsigned long base, len;
+        unsigned int bar = 0;
+
+        if ((pci_resource_flags(dev, bar) & IORESOURCE_MEM) == 0) {
+                moan_device("no memory in bar", dev);
+                return;
+        }
+
+        base = pci_resource_start(dev, bar);
+        len =  pci_resource_len(dev, bar);
+        p = ioremap_nocache(base, len);
+        if (p == NULL)
+                return;
+
+        /* Disable the CPU Interrupt */
+        writel(readl(p + NI8420_INT_ENABLE_REG) & ~(NI8420_INT_ENABLE_BIT),
+               p + NI8420_INT_ENABLE_REG);
+        iounmap(p);
+}
+
+
+/* MITE registers */
+#define MITE_IOWBSR1    0xc4
+#define MITE_IOWCR1     0xf4
+#define MITE_LCIMR1     0x08
+#define MITE_LCIMR2     0x10
+
+#define MITE_LCIMR2_CLR_CPU_IE  (1 << 30)
+
+static void __devexit pci_ni8430_exit(struct pci_dev *dev)
+{
+        void __iomem *p;
+        unsigned long base, len;
+        unsigned int bar = 0;
+
+        if ((pci_resource_flags(dev, bar) & IORESOURCE_MEM) == 0) {
+                moan_device("no memory in bar", dev);
+                return;
+        }
+
+        base = pci_resource_start(dev, bar);
+        len =  pci_resource_len(dev, bar);
+        p = ioremap_nocache(base, len);
+        if (p == NULL)
+                return;
+
+        /* Disable the CPU Interrupt */
+        writel(MITE_LCIMR2_CLR_CPU_IE, p + MITE_LCIMR2);
+        iounmap(p);
+}
+
+/* SBS Technologies Inc. PMC-OCTPRO and P-OCTAL cards */
+static int
+sbs_setup(struct serial_private *priv, const struct pciserial_board *board,
+                struct uart_port *port, int idx)
+{
+        unsigned int bar, offset = board->first_offset;
+
+        bar = 0;
+
+        if (idx < 4) {
+                /* first four channels map to 0, 0x100, 0x200, 0x300 */
+                offset += idx * board->uart_offset;
+        } else if (idx < 8) {
+                /* last four channels map to 0x1000, 0x1100, 0x1200, 0x1300 */
+                offset += idx * board->uart_offset + 0xC00;
+        } else /* we have only 8 ports on PMC-OCTALPRO */
+                return 1;
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+/*
+* This does initialization for PMC OCTALPRO cards:
+* maps the device memory, resets the UARTs (needed, bc
+* if the module is removed and inserted again, the card
+* is in the sleep mode) and enables global interrupt.
+*/
+
+/* global control register offset for SBS PMC-OctalPro */
+#define OCT_REG_CR_OFF          0x500
+
+static int sbs_init(struct pci_dev *dev)
+{
+        u8 __iomem *p;
+
+        p = pci_ioremap_bar(dev, 0);
+
+        if (p == NULL)
+                return -ENOMEM;
+        /* Set bit-4 Control Register (UART RESET) in to reset the uarts */
+        writeb(0x10, p + OCT_REG_CR_OFF);
+        udelay(50);
+        writeb(0x0, p + OCT_REG_CR_OFF);
+
+        /* Set bit-2 (INTENABLE) of Control Register */
+        writeb(0x4, p + OCT_REG_CR_OFF);
+        iounmap(p);
+
+        return 0;
+}
+
+/*
+ * Disables the global interrupt of PMC-OctalPro
+ */
+
+static void __devexit sbs_exit(struct pci_dev *dev)
+{
+        u8 __iomem *p;
+
+        p = pci_ioremap_bar(dev, 0);
+        /* FIXME: What if resource_len < OCT_REG_CR_OFF */
+        if (p != NULL)
+                writeb(0, p + OCT_REG_CR_OFF);
+        iounmap(p);
+}
+
+/*
+ * SIIG serial cards have an PCI interface chip which also controls
+ * the UART clocking frequency. Each UART can be clocked independently
+ * (except cards equipped with 4 UARTs) and initial clocking settings
+ * are stored in the EEPROM chip. It can cause problems because this
+ * version of serial driver doesn't support differently clocked UART's
+ * on single PCI card. To prevent this, initialization functions set
+ * high frequency clocking for all UART's on given card. It is safe (I
+ * hope) because it doesn't touch EEPROM settings to prevent conflicts
+ * with other OSes (like M$ DOS).
+ *
+ *  SIIG support added by Andrey Panin <pazke@donpac.ru>, 10/1999
+ *
+ * There is two family of SIIG serial cards with different PCI
+ * interface chip and different configuration methods:
+ *     - 10x cards have control registers in IO and/or memory space;
+ *     - 20x cards have control registers in standard PCI configuration space.
+ *
+ * Note: all 10x cards have PCI device ids 0x10..
+ *       all 20x cards have PCI device ids 0x20..
+ *
+ * There are also Quartet Serial cards which use Oxford Semiconductor
+ * 16954 quad UART PCI chip clocked by 18.432 MHz quartz.
+ *
+ * Note: some SIIG cards are probed by the parport_serial object.
+ */
+
+#define PCI_DEVICE_ID_SIIG_1S_10x (PCI_DEVICE_ID_SIIG_1S_10x_550 & 0xfffc)
+#define PCI_DEVICE_ID_SIIG_2S_10x (PCI_DEVICE_ID_SIIG_2S_10x_550 & 0xfff8)
+
+static int pci_siig10x_init(struct pci_dev *dev)
+{
+        u16 data;
+        void __iomem *p;
+
+        switch (dev->device & 0xfff8) {
+        case PCI_DEVICE_ID_SIIG_1S_10x: /* 1S */
+                data = 0xffdf;
+                break;
+        case PCI_DEVICE_ID_SIIG_2S_10x: /* 2S, 2S1P */
+                data = 0xf7ff;
+                break;
+        default:                        /* 1S1P, 4S */
+                data = 0xfffb;
+                break;
+        }
+
+        p = ioremap_nocache(pci_resource_start(dev, 0), 0x80);
+        if (p == NULL)
+                return -ENOMEM;
+
+        writew(readw(p + 0x28) & data, p + 0x28);
+        readw(p + 0x28);
+        iounmap(p);
+        return 0;
+}
+
+#define PCI_DEVICE_ID_SIIG_2S_20x (PCI_DEVICE_ID_SIIG_2S_20x_550 & 0xfffc)
+#define PCI_DEVICE_ID_SIIG_2S1P_20x (PCI_DEVICE_ID_SIIG_2S1P_20x_550 & 0xfffc)
+
+static int pci_siig20x_init(struct pci_dev *dev)
+{
+        u8 data;
+
+        /* Change clock frequency for the first UART. */
+        pci_read_config_byte(dev, 0x6f, &data);
+        pci_write_config_byte(dev, 0x6f, data & 0xef);
+
+        /* If this card has 2 UART, we have to do the same with second UART. */
+        if (((dev->device & 0xfffc) == PCI_DEVICE_ID_SIIG_2S_20x) ||
+            ((dev->device & 0xfffc) == PCI_DEVICE_ID_SIIG_2S1P_20x)) {
+                pci_read_config_byte(dev, 0x73, &data);
+                pci_write_config_byte(dev, 0x73, data & 0xef);
+        }
+        return 0;
+}
+
+static int pci_siig_init(struct pci_dev *dev)
+{
+        unsigned int type = dev->device & 0xff00;
+
+        if (type == 0x1000)
+                return pci_siig10x_init(dev);
+        else if (type == 0x2000)
+                return pci_siig20x_init(dev);
+
+        moan_device("Unknown SIIG card", dev);
+        return -ENODEV;
+}
+
+static int pci_siig_setup(struct serial_private *priv,
+                          const struct pciserial_board *board,
+                          struct uart_port *port, int idx)
+{
+        unsigned int bar = FL_GET_BASE(board->flags) + idx, offset = 0;
+
+        if (idx > 3) {
+                bar = 4;
+                offset = (idx - 4) * 8;
+        }
+
+        return setup_port(priv, port, bar, offset, 0);
+}
+
+/*
+ * Timedia has an explosion of boards, and to avoid the PCI table from
+ * growing *huge*, we use this function to collapse some 70 entries
+ * in the PCI table into one, for sanity's and compactness's sake.
+ */
+static const unsigned short timedia_single_port[] = {
+        0x4025, 0x4027, 0x4028, 0x5025, 0x5027, 0
+};
+
+static const unsigned short timedia_dual_port[] = {
+        0x0002, 0x4036, 0x4037, 0x4038, 0x4078, 0x4079, 0x4085,
+        0x4088, 0x4089, 0x5037, 0x5078, 0x5079, 0x5085, 0x6079,
+        0x7079, 0x8079, 0x8137, 0x8138, 0x8237, 0x8238, 0x9079,
+        0x9137, 0x9138, 0x9237, 0x9238, 0xA079, 0xB079, 0xC079,
+        0xD079, 0
+};
+
+static const unsigned short timedia_quad_port[] = {
+        0x4055, 0x4056, 0x4095, 0x4096, 0x5056, 0x8156, 0x8157,
+        0x8256, 0x8257, 0x9056, 0x9156, 0x9157, 0x9158, 0x9159,
+        0x9256, 0x9257, 0xA056, 0xA157, 0xA158, 0xA159, 0xB056,
+        0xB157, 0
+};
+
+static const unsigned short timedia_eight_port[] = {
+        0x4065, 0x4066, 0x5065, 0x5066, 0x8166, 0x9066, 0x9166,
+        0x9167, 0x9168, 0xA066, 0xA167, 0xA168, 0
+};
+
+static const struct timedia_struct {
+        int num;
+        const unsigned short *ids;
+} timedia_data[] = {
+        { 1, timedia_single_port },
+        { 2, timedia_dual_port },
+        { 4, timedia_quad_port },
+        { 8, timedia_eight_port }
+};
+
+static int pci_timedia_init(struct pci_dev *dev)
+{
+        const unsigned short *ids;
+        int i, j;
+
+        for (i = 0; i < ARRAY_SIZE(timedia_data); i++) {
+                ids = timedia_data[i].ids;
+                for (j = 0; ids[j]; j++)
+                        if (dev->subsystem_device == ids[j])
+                                return timedia_data[i].num;
+        }
+        return 0;
+}
+
+/*
+ * Timedia/SUNIX uses a mixture of BARs and offsets
+ * Ugh, this is ugly as all hell --- TYT
+ */
+static int
+pci_timedia_setup(struct serial_private *priv,
+                  const struct pciserial_board *board,
+                  struct uart_port *port, int idx)
+{
+        unsigned int bar = 0, offset = board->first_offset;
+
+        switch (idx) {
+        case 0:
+                bar = 0;
+                break;
+        case 1:
+                offset = board->uart_offset;
+                bar = 0;
+                break;
+        case 2:
+                bar = 1;
+                break;
+        case 3:
+                offset = board->uart_offset;
+                /* FALLTHROUGH */
+        case 4: /* BAR 2 */
+        case 5: /* BAR 3 */
+        case 6: /* BAR 4 */
+        case 7: /* BAR 5 */
+                bar = idx - 2;
+        }
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+/*
+ * Some Titan cards are also a little weird
+ */
+static int
+titan_400l_800l_setup(struct serial_private *priv,
+                      const struct pciserial_board *board,
+                      struct uart_port *port, int idx)
+{
+        unsigned int bar, offset = board->first_offset;
+
+        switch (idx) {
+        case 0:
+                bar = 1;
+                break;
+        case 1:
+                bar = 2;
+                break;
+        default:
+                bar = 4;
+                offset = (idx - 2) * board->uart_offset;
+        }
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+static int pci_xircom_init(struct pci_dev *dev)
+{
+        msleep(100);
+        return 0;
+}
+
+static int pci_ni8420_init(struct pci_dev *dev)
+{
+        void __iomem *p;
+        unsigned long base, len;
+        unsigned int bar = 0;
+
+        if ((pci_resource_flags(dev, bar) & IORESOURCE_MEM) == 0) {
+                moan_device("no memory in bar", dev);
+                return 0;
+        }
+
+        base = pci_resource_start(dev, bar);
+        len =  pci_resource_len(dev, bar);
+        p = ioremap_nocache(base, len);
+        if (p == NULL)
+                return -ENOMEM;
+
+        /* Enable CPU Interrupt */
+        writel(readl(p + NI8420_INT_ENABLE_REG) | NI8420_INT_ENABLE_BIT,
+               p + NI8420_INT_ENABLE_REG);
+
+        iounmap(p);
+        return 0;
+}
+
+#define MITE_IOWBSR1_WSIZE      0xa
+#define MITE_IOWBSR1_WIN_OFFSET 0x800
+#define MITE_IOWBSR1_WENAB      (1 << 7)
+#define MITE_LCIMR1_IO_IE_0     (1 << 24)
+#define MITE_LCIMR2_SET_CPU_IE  (1 << 31)
+#define MITE_IOWCR1_RAMSEL_MASK 0xfffffffe
+
+static int pci_ni8430_init(struct pci_dev *dev)
+{
+        void __iomem *p;
+        unsigned long base, len;
+        u32 device_window;
+        unsigned int bar = 0;
+
+        if ((pci_resource_flags(dev, bar) & IORESOURCE_MEM) == 0) {
+                moan_device("no memory in bar", dev);
+                return 0;
+        }
+
+        base = pci_resource_start(dev, bar);
+        len =  pci_resource_len(dev, bar);
+        p = ioremap_nocache(base, len);
+        if (p == NULL)
+                return -ENOMEM;
+
+        /* Set device window address and size in BAR0 */
+        device_window = ((base + MITE_IOWBSR1_WIN_OFFSET) & 0xffffff00)
+                        | MITE_IOWBSR1_WENAB | MITE_IOWBSR1_WSIZE;
+        writel(device_window, p + MITE_IOWBSR1);
+
+        /* Set window access to go to RAMSEL IO address space */
+        writel((readl(p + MITE_IOWCR1) & MITE_IOWCR1_RAMSEL_MASK),
+               p + MITE_IOWCR1);
+
+        /* Enable IO Bus Interrupt 0 */
+        writel(MITE_LCIMR1_IO_IE_0, p + MITE_LCIMR1);
+
+        /* Enable CPU Interrupt */
+        writel(MITE_LCIMR2_SET_CPU_IE, p + MITE_LCIMR2);
+
+        iounmap(p);
+        return 0;
+}
+
+/* UART Port Control Register */
+#define NI8430_PORTCON  0x0f
+#define NI8430_PORTCON_TXVR_ENABLE      (1 << 3)
+
+static int
+pci_ni8430_setup(struct serial_private *priv,
+                 const struct pciserial_board *board,
+                 struct uart_port *port, int idx)
+{
+        void __iomem *p;
+        unsigned long base, len;
+        unsigned int bar, offset = board->first_offset;
+
+        if (idx >= board->num_ports)
+                return 1;
+
+        bar = FL_GET_BASE(board->flags);
+        offset += idx * board->uart_offset;
+
+        base = pci_resource_start(priv->dev, bar);
+        len =  pci_resource_len(priv->dev, bar);
+        p = ioremap_nocache(base, len);
+
+        /* enable the transciever */
+        writeb(readb(p + offset + NI8430_PORTCON) | NI8430_PORTCON_TXVR_ENABLE,
+               p + offset + NI8430_PORTCON);
+
+        iounmap(p);
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+
+static int pci_netmos_init(struct pci_dev *dev)
+{
+        /* subdevice 0x00PS means <P> parallel, <S> serial */
+        unsigned int num_serial = dev->subsystem_device & 0xf;
+
+        if ((dev->device == PCI_DEVICE_ID_NETMOS_9901) ||
+                (dev->device == PCI_DEVICE_ID_NETMOS_9865))
+                return 0;
+        if (dev->subsystem_vendor == PCI_VENDOR_ID_IBM &&
+                        dev->subsystem_device == 0x0299)
+                return 0;
+
+        if (num_serial == 0)
+                return -ENODEV;
+        return num_serial;
+}
+
+/*
+ * These chips are available with optionally one parallel port and up to
+ * two serial ports. Unfortunately they all have the same product id.
+ *
+ * Basic configuration is done over a region of 32 I/O ports. The base
+ * ioport is called INTA or INTC, depending on docs/other drivers.
+ *
+ * The region of the 32 I/O ports is configured in POSIO0R...
+ */
+
+/* registers */
+#define ITE_887x_MISCR          0x9c
+#define ITE_887x_INTCBAR        0x78
+#define ITE_887x_UARTBAR        0x7c
+#define ITE_887x_PS0BAR         0x10
+#define ITE_887x_POSIO0         0x60
+
+/* I/O space size */
+#define ITE_887x_IOSIZE         32
+/* I/O space size (bits 26-24; 8 bytes = 011b) */
+#define ITE_887x_POSIO_IOSIZE_8         (3 << 24)
+/* I/O space size (bits 26-24; 32 bytes = 101b) */
+#define ITE_887x_POSIO_IOSIZE_32        (5 << 24)
+/* Decoding speed (1 = slow, 2 = medium, 3 = fast) */
+#define ITE_887x_POSIO_SPEED            (3 << 29)
+/* enable IO_Space bit */
+#define ITE_887x_POSIO_ENABLE           (1 << 31)
+
+static int pci_ite887x_init(struct pci_dev *dev)
+{
+        /* inta_addr are the configuration addresses of the ITE */
+        static const short inta_addr[] = { 0x2a0, 0x2c0, 0x220, 0x240, 0x1e0,
+                                                        0x200, 0x280, 0 };
+        int ret, i, type;
+        struct resource *iobase = NULL;
+        u32 miscr, uartbar, ioport;
+
+        /* search for the base-ioport */
+        i = 0;
+        while (inta_addr[i] && iobase == NULL) {
+                iobase = request_region(inta_addr[i], ITE_887x_IOSIZE,
+                                                                "ite887x");
+                if (iobase != NULL) {
+                        /* write POSIO0R - speed | size | ioport */
+                        pci_write_config_dword(dev, ITE_887x_POSIO0,
+                                ITE_887x_POSIO_ENABLE | ITE_887x_POSIO_SPEED |
+                                ITE_887x_POSIO_IOSIZE_32 | inta_addr[i]);
+                        /* write INTCBAR - ioport */
+                        pci_write_config_dword(dev, ITE_887x_INTCBAR,
+                                                                inta_addr[i]);
+                        ret = inb(inta_addr[i]);
+                        if (ret != 0xff) {
+                                /* ioport connected */
+                                break;
+                        }
+                        release_region(iobase->start, ITE_887x_IOSIZE);
+                        iobase = NULL;
+                }
+                i++;
+        }
+
+        if (!inta_addr[i]) {
+                printk(KERN_ERR "ite887x: could not find iobase\n");
+                return -ENODEV;
+        }
+
+        /* start of undocumented type checking (see parport_pc.c) */
+        type = inb(iobase->start + 0x18) & 0x0f;
+
+        switch (type) {
+        case 0x2:       /* ITE8871 (1P) */
+        case 0xa:       /* ITE8875 (1P) */
+                ret = 0;
+                break;
+        case 0xe:       /* ITE8872 (2S1P) */
+                ret = 2;
+                break;
+        case 0x6:       /* ITE8873 (1S) */
+                ret = 1;
+                break;
+        case 0x8:       /* ITE8874 (2S) */
+                ret = 2;
+                break;
+        default:
+                moan_device("Unknown ITE887x", dev);
+                ret = -ENODEV;
+        }
+
+        /* configure all serial ports */
+        for (i = 0; i < ret; i++) {
+                /* read the I/O port from the device */
+                pci_read_config_dword(dev, ITE_887x_PS0BAR + (0x4 * (i + 1)),
+                                                                &ioport);
+                ioport &= 0x0000FF00;   /* the actual base address */
+                pci_write_config_dword(dev, ITE_887x_POSIO0 + (0x4 * (i + 1)),
+                        ITE_887x_POSIO_ENABLE | ITE_887x_POSIO_SPEED |
+                        ITE_887x_POSIO_IOSIZE_8 | ioport);
+
+                /* write the ioport to the UARTBAR */
+                pci_read_config_dword(dev, ITE_887x_UARTBAR, &uartbar);
+                uartbar &= ~(0xffff << (16 * i));       /* clear half the reg */
+                uartbar |= (ioport << (16 * i));        /* set the ioport */
+                pci_write_config_dword(dev, ITE_887x_UARTBAR, uartbar);
+
+                /* get current config */
+                pci_read_config_dword(dev, ITE_887x_MISCR, &miscr);
+                /* disable interrupts (UARTx_Routing[3:0]) */
+                miscr &= ~(0xf << (12 - 4 * i));
+                /* activate the UART (UARTx_En) */
+                miscr |= 1 << (23 - i);
+                /* write new config with activated UART */
+                pci_write_config_dword(dev, ITE_887x_MISCR, miscr);
+        }
+
+        if (ret <= 0) {
+                /* the device has no UARTs if we get here */
+                release_region(iobase->start, ITE_887x_IOSIZE);
+        }
+
+        return ret;
+}
+
+static void __devexit pci_ite887x_exit(struct pci_dev *dev)
+{
+        u32 ioport;
+        /* the ioport is bit 0-15 in POSIO0R */
+        pci_read_config_dword(dev, ITE_887x_POSIO0, &ioport);
+        ioport &= 0xffff;
+        release_region(ioport, ITE_887x_IOSIZE);
+}
+
+/*
+ * Oxford Semiconductor Inc.
+ * Check that device is part of the Tornado range of devices, then determine
+ * the number of ports available on the device.
+ */
+static int pci_oxsemi_tornado_init(struct pci_dev *dev)
+{
+        u8 __iomem *p;
+        unsigned long deviceID;
+        unsigned int  number_uarts = 0;
+
+        /* OxSemi Tornado devices are all 0xCxxx */
+        if (dev->vendor == PCI_VENDOR_ID_OXSEMI &&
+            (dev->device & 0xF000) != 0xC000)
+                return 0;
+
+        p = pci_iomap(dev, 0, 5);
+        if (p == NULL)
+                return -ENOMEM;
+
+        deviceID = ioread32(p);
+        /* Tornado device */
+        if (deviceID == 0x07000200) {
+                number_uarts = ioread8(p + 4);
+                printk(KERN_DEBUG
+                        "%d ports detected on Oxford PCI Express device\n",
+                                                                number_uarts);
+        }
+        pci_iounmap(dev, p);
+        return number_uarts;
+}
+
+static int
+pci_default_setup(struct serial_private *priv,
+                  const struct pciserial_board *board,
+                  struct uart_port *port, int idx)
+{
+        unsigned int bar, offset = board->first_offset, maxnr;
+
+        bar = FL_GET_BASE(board->flags);
+        if (board->flags & FL_BASE_BARS)
+                bar += idx;
+        else
+                offset += idx * board->uart_offset;
+
+        maxnr = (pci_resource_len(priv->dev, bar) - board->first_offset) >>
+                (board->reg_shift + 3);
+
+        if (board->flags & FL_REGION_SZ_CAP && idx >= maxnr)
+                return 1;
+
+        return setup_port(priv, port, bar, offset, board->reg_shift);
+}
+
+static int
+ce4100_serial_setup(struct serial_private *priv,
+                  const struct pciserial_board *board,
+                  struct uart_port *port, int idx)
+{
+        int ret;
+
+        ret = setup_port(priv, port, 0, 0, board->reg_shift);
+        port->iotype = UPIO_MEM32;
+        port->type = PORT_XSCALE;
+        port->flags = (port->flags | UPF_FIXED_PORT | UPF_FIXED_TYPE);
+        port->regshift = 2;
+
+        return ret;
+}
+
+static int
+pci_omegapci_setup(struct serial_private *priv,
+                      const struct pciserial_board *board,
+                      struct uart_port *port, int idx)
+{
+        return setup_port(priv, port, 2, idx * 8, 0);
+}
+
+static int skip_tx_en_setup(struct serial_private *priv,
+                        const struct pciserial_board *board,
+                        struct uart_port *port, int idx)
+{
+        port->flags |= UPF_NO_TXEN_TEST;
+        printk(KERN_DEBUG "serial8250: skipping TxEn test for device "
+                          "[%04x:%04x] subsystem [%04x:%04x]\n",
+                          priv->dev->vendor,
+                          priv->dev->device,
+                          priv->dev->subsystem_vendor,
+                          priv->dev->subsystem_device);
+
+        return pci_default_setup(priv, board, port, idx);
+}
+
+static int pci_eg20t_init(struct pci_dev *dev)
+{
+#if defined(CONFIG_SERIAL_PCH_UART) || defined(CONFIG_SERIAL_PCH_UART_MODULE)
+        return -ENODEV;
+#else
+        return 0;
+#endif
+}
+
+/* This should be in linux/pci_ids.h */
+#define PCI_VENDOR_ID_SBSMODULARIO      0x124B
+#define PCI_SUBVENDOR_ID_SBSMODULARIO   0x124B
+#define PCI_DEVICE_ID_OCTPRO            0x0001
+#define PCI_SUBDEVICE_ID_OCTPRO232      0x0108
+#define PCI_SUBDEVICE_ID_OCTPRO422      0x0208
+#define PCI_SUBDEVICE_ID_POCTAL232      0x0308
+#define PCI_SUBDEVICE_ID_POCTAL422      0x0408
+#define PCI_VENDOR_ID_ADVANTECH         0x13fe
+#define PCI_DEVICE_ID_INTEL_CE4100_UART 0x2e66
+#define PCI_DEVICE_ID_ADVANTECH_PCI3620 0x3620
+#define PCI_DEVICE_ID_TITAN_200I        0x8028
+#define PCI_DEVICE_ID_TITAN_400I        0x8048
+#define PCI_DEVICE_ID_TITAN_800I        0x8088
+#define PCI_DEVICE_ID_TITAN_800EH       0xA007
+#define PCI_DEVICE_ID_TITAN_800EHB      0xA008
+#define PCI_DEVICE_ID_TITAN_400EH       0xA009
+#define PCI_DEVICE_ID_TITAN_100E        0xA010
+#define PCI_DEVICE_ID_TITAN_200E        0xA012
+#define PCI_DEVICE_ID_TITAN_400E        0xA013
+#define PCI_DEVICE_ID_TITAN_800E        0xA014
+#define PCI_DEVICE_ID_TITAN_200EI       0xA016
+#define PCI_DEVICE_ID_TITAN_200EISI     0xA017
+#define PCI_DEVICE_ID_OXSEMI_16PCI958   0x9538
+#define PCIE_DEVICE_ID_NEO_2_OX_IBM     0x00F6
+#define PCI_DEVICE_ID_PLX_CRONYX_OMEGA  0xc001
+
+/* Unknown vendors/cards - this should not be in linux/pci_ids.h */
+#define PCI_SUBDEVICE_ID_UNKNOWN_0x1584 0x1584
+
+/*
+ * Master list of serial port init/setup/exit quirks.
+ * This does not describe the general nature of the port.
+ * (ie, baud base, number and location of ports, etc)
+ *
+ * This list is ordered alphabetically by vendor then device.
+ * Specific entries must come before more generic entries.
+ */
+static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
+        /*
+        * ADDI-DATA GmbH communication cards <info@addi-data.com>
+        */
+        {
+                .vendor         = PCI_VENDOR_ID_ADDIDATA_OLD,
+                .device         = PCI_DEVICE_ID_ADDIDATA_APCI7800,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = addidata_apci7800_setup,
+        },
+        /*
+         * AFAVLAB cards - these may be called via parport_serial
+         *  It is not clear whether this applies to all products.
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_AFAVLAB,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = afavlab_setup,
+        },
+        /*
+         * HP Diva
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_HP,
+                .device         = PCI_DEVICE_ID_HP_DIVA,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_hp_diva_init,
+                .setup          = pci_hp_diva_setup,
+        },
+        /*
+         * Intel
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = PCI_DEVICE_ID_INTEL_80960_RP,
+                .subvendor      = 0xe4bf,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_inteli960ni_init,
+                .setup          = pci_default_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = PCI_DEVICE_ID_INTEL_8257X_SOL,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = skip_tx_en_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = PCI_DEVICE_ID_INTEL_82573L_SOL,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = skip_tx_en_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = PCI_DEVICE_ID_INTEL_82573E_SOL,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = skip_tx_en_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = PCI_DEVICE_ID_INTEL_CE4100_UART,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = ce4100_serial_setup,
+        },
+        /*
+         * ITE
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_ITE,
+                .device         = PCI_DEVICE_ID_ITE_8872,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ite887x_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ite887x_exit),
+        },
+        /*
+         * National Instruments
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PCI23216,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PCI2328,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PCI2324,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PCI2322,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PCI2324I,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PCI2322I,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PXI8420_23216,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PXI8420_2328,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PXI8420_2324,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PXI8420_2322,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PXI8422_2324,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_DEVICE_ID_NI_PXI8422_2322,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8420_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_ni8420_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_NI,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_ni8430_init,
+                .setup          = pci_ni8430_setup,
+                .exit           = __devexit_p(pci_ni8430_exit),
+        },
+        /*
+         * Panacom
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_PANACOM,
+                .device         = PCI_DEVICE_ID_PANACOM_QUADMODEM,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_plx9050_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_plx9050_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_PANACOM,
+                .device         = PCI_DEVICE_ID_PANACOM_DUALMODEM,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_plx9050_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_plx9050_exit),
+        },
+        /*
+         * PLX
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_PLX,
+                .device         = PCI_DEVICE_ID_PLX_9030,
+                .subvendor      = PCI_SUBVENDOR_ID_PERLE,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = pci_default_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_PLX,
+                .device         = PCI_DEVICE_ID_PLX_9050,
+                .subvendor      = PCI_SUBVENDOR_ID_EXSYS,
+                .subdevice      = PCI_SUBDEVICE_ID_EXSYS_4055,
+                .init           = pci_plx9050_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_plx9050_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_PLX,
+                .device         = PCI_DEVICE_ID_PLX_9050,
+                .subvendor      = PCI_SUBVENDOR_ID_KEYSPAN,
+                .subdevice      = PCI_SUBDEVICE_ID_KEYSPAN_SX2,
+                .init           = pci_plx9050_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_plx9050_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_PLX,
+                .device         = PCI_DEVICE_ID_PLX_9050,
+                .subvendor      = PCI_VENDOR_ID_PLX,
+                .subdevice      = PCI_SUBDEVICE_ID_UNKNOWN_0x1584,
+                .init           = pci_plx9050_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_plx9050_exit),
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_PLX,
+                .device         = PCI_DEVICE_ID_PLX_ROMULUS,
+                .subvendor      = PCI_VENDOR_ID_PLX,
+                .subdevice      = PCI_DEVICE_ID_PLX_ROMULUS,
+                .init           = pci_plx9050_init,
+                .setup          = pci_default_setup,
+                .exit           = __devexit_p(pci_plx9050_exit),
+        },
+        /*
+         * SBS Technologies, Inc., PMC-OCTALPRO 232
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_SBSMODULARIO,
+                .device         = PCI_DEVICE_ID_OCTPRO,
+                .subvendor      = PCI_SUBVENDOR_ID_SBSMODULARIO,
+                .subdevice      = PCI_SUBDEVICE_ID_OCTPRO232,
+                .init           = sbs_init,
+                .setup          = sbs_setup,
+                .exit           = __devexit_p(sbs_exit),
+        },
+        /*
+         * SBS Technologies, Inc., PMC-OCTALPRO 422
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_SBSMODULARIO,
+                .device         = PCI_DEVICE_ID_OCTPRO,
+                .subvendor      = PCI_SUBVENDOR_ID_SBSMODULARIO,
+                .subdevice      = PCI_SUBDEVICE_ID_OCTPRO422,
+                .init           = sbs_init,
+                .setup          = sbs_setup,
+                .exit           = __devexit_p(sbs_exit),
+        },
+        /*
+         * SBS Technologies, Inc., P-Octal 232
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_SBSMODULARIO,
+                .device         = PCI_DEVICE_ID_OCTPRO,
+                .subvendor      = PCI_SUBVENDOR_ID_SBSMODULARIO,
+                .subdevice      = PCI_SUBDEVICE_ID_POCTAL232,
+                .init           = sbs_init,
+                .setup          = sbs_setup,
+                .exit           = __devexit_p(sbs_exit),
+        },
+        /*
+         * SBS Technologies, Inc., P-Octal 422
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_SBSMODULARIO,
+                .device         = PCI_DEVICE_ID_OCTPRO,
+                .subvendor      = PCI_SUBVENDOR_ID_SBSMODULARIO,
+                .subdevice      = PCI_SUBDEVICE_ID_POCTAL422,
+                .init           = sbs_init,
+                .setup          = sbs_setup,
+                .exit           = __devexit_p(sbs_exit),
+        },
+        /*
+         * SIIG cards - these may be called via parport_serial
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_SIIG,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_siig_init,
+                .setup          = pci_siig_setup,
+        },
+        /*
+         * Titan cards
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_TITAN,
+                .device         = PCI_DEVICE_ID_TITAN_400L,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = titan_400l_800l_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_TITAN,
+                .device         = PCI_DEVICE_ID_TITAN_800L,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = titan_400l_800l_setup,
+        },
+        /*
+         * Timedia cards
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_TIMEDIA,
+                .device         = PCI_DEVICE_ID_TIMEDIA_1889,
+                .subvendor      = PCI_VENDOR_ID_TIMEDIA,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_timedia_init,
+                .setup          = pci_timedia_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_TIMEDIA,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = pci_timedia_setup,
+        },
+        /*
+         * Xircom cards
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_XIRCOM,
+                .device         = PCI_DEVICE_ID_XIRCOM_X3201_MDM,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_xircom_init,
+                .setup          = pci_default_setup,
+        },
+        /*
+         * Netmos cards - these may be called via parport_serial
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_NETMOS,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_netmos_init,
+                .setup          = pci_default_setup,
+        },
+        /*
+         * For Oxford Semiconductor Tornado based devices
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_OXSEMI,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_oxsemi_tornado_init,
+                .setup          = pci_default_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_MAINPINE,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .init           = pci_oxsemi_tornado_init,
+                .setup          = pci_default_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_DIGI,
+                .device         = PCIE_DEVICE_ID_NEO_2_OX_IBM,
+                .subvendor              = PCI_SUBVENDOR_ID_IBM,
+                .subdevice              = PCI_ANY_ID,
+                .init                   = pci_oxsemi_tornado_init,
+                .setup          = pci_default_setup,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = 0x8811,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = 0x8812,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = 0x8813,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_INTEL,
+                .device         = 0x8814,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = 0x10DB,
+                .device         = 0x8027,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = 0x10DB,
+                .device         = 0x8028,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = 0x10DB,
+                .device         = 0x8029,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = 0x10DB,
+                .device         = 0x800C,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = 0x10DB,
+                .device         = 0x800D,
+                .init           = pci_eg20t_init,
+        },
+        {
+                .vendor         = 0x10DB,
+                .device         = 0x800D,
+                .init           = pci_eg20t_init,
+        },
+        /*
+         * Cronyx Omega PCI (PLX-chip based)
+         */
+        {
+                .vendor         = PCI_VENDOR_ID_PLX,
+                .device         = PCI_DEVICE_ID_PLX_CRONYX_OMEGA,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = pci_omegapci_setup,
+         },
+        /*
+         * Default "match everything" terminator entry
+         */
+        {
+                .vendor         = PCI_ANY_ID,
+                .device         = PCI_ANY_ID,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+                .setup          = pci_default_setup,
+        }
+};
+
+static inline int quirk_id_matches(u32 quirk_id, u32 dev_id)
+{
+        return quirk_id == PCI_ANY_ID || quirk_id == dev_id;
+}
+
+static struct pci_serial_quirk *find_quirk(struct pci_dev *dev)
+{
+        struct pci_serial_quirk *quirk;
+
+        for (quirk = pci_serial_quirks; ; quirk++)
+                if (quirk_id_matches(quirk->vendor, dev->vendor) &&
+                    quirk_id_matches(quirk->device, dev->device) &&
+                    quirk_id_matches(quirk->subvendor, dev->subsystem_vendor) &&
+                    quirk_id_matches(quirk->subdevice, dev->subsystem_device))
+                        break;
+        return quirk;
+}
+
+static inline int get_pci_irq(struct pci_dev *dev,
+                                const struct pciserial_board *board)
+{
+        if (board->flags & FL_NOIRQ)
+                return 0;
+        else
+                return dev->irq;
+}
+
+/*
+ * This is the configuration table for all of the PCI serial boards
+ * which we support.  It is directly indexed by the pci_board_num_t enum
+ * value, which is encoded in the pci_device_id PCI probe table's
+ * driver_data member.
+ *
+ * The makeup of these names are:
+ *  pbn_bn{_bt}_n_baud{_offsetinhex}
+ *
+ *  bn          = PCI BAR number
+ *  bt          = Index using PCI BARs
+ *  n           = number of serial ports
+ *  baud        = baud rate
+ *  offsetinhex = offset for each sequential port (in hex)
+ *
+ * This table is sorted by (in order): bn, bt, baud, offsetindex, n.
+ *
+ * Please note: in theory if n = 1, _bt infix should make no difference.
+ * ie, pbn_b0_1_115200 is the same as pbn_b0_bt_1_115200
+ */
+enum pci_board_num_t {
+        pbn_default = 0,
+
+        pbn_b0_1_115200,
+        pbn_b0_2_115200,
+        pbn_b0_4_115200,
+        pbn_b0_5_115200,
+        pbn_b0_8_115200,
+
+        pbn_b0_1_921600,
+        pbn_b0_2_921600,
+        pbn_b0_4_921600,
+
+        pbn_b0_2_1130000,
+
+        pbn_b0_4_1152000,
+
+        pbn_b0_2_1843200,
+        pbn_b0_4_1843200,
+
+        pbn_b0_2_1843200_200,
+        pbn_b0_4_1843200_200,
+        pbn_b0_8_1843200_200,
+
+        pbn_b0_1_4000000,
+
+        pbn_b0_bt_1_115200,
+        pbn_b0_bt_2_115200,
+        pbn_b0_bt_4_115200,
+        pbn_b0_bt_8_115200,
+
+        pbn_b0_bt_1_460800,
+        pbn_b0_bt_2_460800,
+        pbn_b0_bt_4_460800,
+
+        pbn_b0_bt_1_921600,
+        pbn_b0_bt_2_921600,
+        pbn_b0_bt_4_921600,
+        pbn_b0_bt_8_921600,
+
+        pbn_b1_1_115200,
+        pbn_b1_2_115200,
+        pbn_b1_4_115200,
+        pbn_b1_8_115200,
+        pbn_b1_16_115200,
+
+        pbn_b1_1_921600,
+        pbn_b1_2_921600,
+        pbn_b1_4_921600,
+        pbn_b1_8_921600,
+
+        pbn_b1_2_1250000,
+
+        pbn_b1_bt_1_115200,
+        pbn_b1_bt_2_115200,
+        pbn_b1_bt_4_115200,
+
+        pbn_b1_bt_2_921600,
+
+        pbn_b1_1_1382400,
+        pbn_b1_2_1382400,
+        pbn_b1_4_1382400,
+        pbn_b1_8_1382400,
+
+        pbn_b2_1_115200,
+        pbn_b2_2_115200,
+        pbn_b2_4_115200,
+        pbn_b2_8_115200,
+
+        pbn_b2_1_460800,
+        pbn_b2_4_460800,
+        pbn_b2_8_460800,
+        pbn_b2_16_460800,
+
+        pbn_b2_1_921600,
+        pbn_b2_4_921600,
+        pbn_b2_8_921600,
+
+        pbn_b2_8_1152000,
+
+        pbn_b2_bt_1_115200,
+        pbn_b2_bt_2_115200,
+        pbn_b2_bt_4_115200,
+
+        pbn_b2_bt_2_921600,
+        pbn_b2_bt_4_921600,
+
+        pbn_b3_2_115200,
+        pbn_b3_4_115200,
+        pbn_b3_8_115200,
+
+        pbn_b4_bt_2_921600,
+        pbn_b4_bt_4_921600,
+        pbn_b4_bt_8_921600,
+
+        /*
+         * Board-specific versions.
+         */
+        pbn_panacom,
+        pbn_panacom2,
+        pbn_panacom4,
+        pbn_exsys_4055,
+        pbn_plx_romulus,
+        pbn_oxsemi,
+        pbn_oxsemi_1_4000000,
+        pbn_oxsemi_2_4000000,
+        pbn_oxsemi_4_4000000,
+        pbn_oxsemi_8_4000000,
+        pbn_intel_i960,
+        pbn_sgi_ioc3,
+        pbn_computone_4,
+        pbn_computone_6,
+        pbn_computone_8,
+        pbn_sbsxrsio,
+        pbn_exar_XR17C152,
+        pbn_exar_XR17C154,
+        pbn_exar_XR17C158,
+        pbn_exar_ibm_saturn,
+        pbn_pasemi_1682M,
+        pbn_ni8430_2,
+        pbn_ni8430_4,
+        pbn_ni8430_8,
+        pbn_ni8430_16,
+        pbn_ADDIDATA_PCIe_1_3906250,
+        pbn_ADDIDATA_PCIe_2_3906250,
+        pbn_ADDIDATA_PCIe_4_3906250,
+        pbn_ADDIDATA_PCIe_8_3906250,
+        pbn_ce4100_1_115200,
+        pbn_omegapci,
+};
+
+/*
+ * uart_offset - the space between channels
+ * reg_shift   - describes how the UART registers are mapped
+ *               to PCI memory by the card.
+ * For example IER register on SBS, Inc. PMC-OctPro is located at
+ * offset 0x10 from the UART base, while UART_IER is defined as 1
+ * in include/linux/serial_reg.h,
+ * see first lines of serial_in() and serial_out() in 8250.c
+*/
+
+static struct pciserial_board pci_boards[] __devinitdata = {
+        [pbn_default] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_1_115200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_2_115200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_4_115200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_5_115200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 5,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_8_115200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_1_921600] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_2_921600] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_4_921600] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b0_2_1130000] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 1130000,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b0_4_1152000] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 1152000,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b0_2_1843200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 1843200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_4_1843200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 1843200,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b0_2_1843200_200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 1843200,
+                .uart_offset    = 0x200,
+        },
+        [pbn_b0_4_1843200_200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 1843200,
+                .uart_offset    = 0x200,
+        },
+        [pbn_b0_8_1843200_200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 1843200,
+                .uart_offset    = 0x200,
+        },
+        [pbn_b0_1_4000000] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 4000000,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b0_bt_1_115200] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_2_115200] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_4_115200] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_8_115200] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 8,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b0_bt_1_460800] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 1,
+                .base_baud      = 460800,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_2_460800] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 460800,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_4_460800] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 4,
+                .base_baud      = 460800,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b0_bt_1_921600] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 1,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_2_921600] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_4_921600] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b0_bt_8_921600] = {
+                .flags          = FL_BASE0|FL_BASE_BARS,
+                .num_ports      = 8,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b1_1_115200] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_2_115200] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 2,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_4_115200] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_8_115200] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 8,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_16_115200] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 16,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b1_1_921600] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 1,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_2_921600] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_4_921600] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_8_921600] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 8,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_2_1250000] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 2,
+                .base_baud      = 1250000,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b1_bt_1_115200] = {
+                .flags          = FL_BASE1|FL_BASE_BARS,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_bt_2_115200] = {
+                .flags          = FL_BASE1|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_bt_4_115200] = {
+                .flags          = FL_BASE1|FL_BASE_BARS,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b1_bt_2_921600] = {
+                .flags          = FL_BASE1|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b1_1_1382400] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 1,
+                .base_baud      = 1382400,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_2_1382400] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 2,
+                .base_baud      = 1382400,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_4_1382400] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 4,
+                .base_baud      = 1382400,
+                .uart_offset    = 8,
+        },
+        [pbn_b1_8_1382400] = {
+                .flags          = FL_BASE1,
+                .num_ports      = 8,
+                .base_baud      = 1382400,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b2_1_115200] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_2_115200] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 2,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_4_115200] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_8_115200] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 8,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b2_1_460800] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 1,
+                .base_baud      = 460800,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_4_460800] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 4,
+                .base_baud      = 460800,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_8_460800] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 8,
+                .base_baud      = 460800,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_16_460800] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 16,
+                .base_baud      = 460800,
+                .uart_offset    = 8,
+         },
+
+        [pbn_b2_1_921600] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 1,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_4_921600] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_8_921600] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 8,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b2_8_1152000] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 8,
+                .base_baud      = 1152000,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b2_bt_1_115200] = {
+                .flags          = FL_BASE2|FL_BASE_BARS,
+                .num_ports      = 1,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_bt_2_115200] = {
+                .flags          = FL_BASE2|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_bt_4_115200] = {
+                .flags          = FL_BASE2|FL_BASE_BARS,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b2_bt_2_921600] = {
+                .flags          = FL_BASE2|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b2_bt_4_921600] = {
+                .flags          = FL_BASE2|FL_BASE_BARS,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b3_2_115200] = {
+                .flags          = FL_BASE3,
+                .num_ports      = 2,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b3_4_115200] = {
+                .flags          = FL_BASE3,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_b3_8_115200] = {
+                .flags          = FL_BASE3,
+                .num_ports      = 8,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
+        [pbn_b4_bt_2_921600] = {
+                .flags          = FL_BASE4,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b4_bt_4_921600] = {
+                .flags          = FL_BASE4,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+        [pbn_b4_bt_8_921600] = {
+                .flags          = FL_BASE4,
+                .num_ports      = 8,
+                .base_baud      = 921600,
+                .uart_offset    = 8,
+        },
+
+        /*
+         * Entries following this are board-specific.
+         */
+
+        /*
+         * Panacom - IOMEM
+         */
+        [pbn_panacom] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 0x400,
+                .reg_shift      = 7,
+        },
+        [pbn_panacom2] = {
+                .flags          = FL_BASE2|FL_BASE_BARS,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 0x400,
+                .reg_shift      = 7,
+        },
+        [pbn_panacom4] = {
+                .flags          = FL_BASE2|FL_BASE_BARS,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 0x400,
+                .reg_shift      = 7,
+        },
+
+        [pbn_exsys_4055] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 4,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+
+        /* I think this entry is broken - the first_offset looks wrong --rmk */
+        [pbn_plx_romulus] = {
+                .flags          = FL_BASE2,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 8 << 2,
+                .reg_shift      = 2,
+                .first_offset   = 0x03,
+        },
+
+        /*
+         * This board uses the size of PCI Base region 0 to
+         * signal now many ports are available
+         */
+        [pbn_oxsemi] = {
+                .flags          = FL_BASE0|FL_REGION_SZ_CAP,
+                .num_ports      = 32,
+                .base_baud      = 115200,
+                .uart_offset    = 8,
+        },
+        [pbn_oxsemi_1_4000000] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 4000000,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+        [pbn_oxsemi_2_4000000] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 4000000,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+        [pbn_oxsemi_4_4000000] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 4000000,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+        [pbn_oxsemi_8_4000000] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 4000000,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+
+
+        /*
+         * EKF addition for i960 Boards form EKF with serial port.
+         * Max 256 ports.
+         */
+        [pbn_intel_i960] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 32,
+                .base_baud      = 921600,
+                .uart_offset    = 8 << 2,
+                .reg_shift      = 2,
+                .first_offset   = 0x10000,
+        },
+        [pbn_sgi_ioc3] = {
+                .flags          = FL_BASE0|FL_NOIRQ,
+                .num_ports      = 1,
+                .base_baud      = 458333,
+                .uart_offset    = 8,
+                .reg_shift      = 0,
+                .first_offset   = 0x20178,
+        },
+
+        /*
+         * Computone - uses IOMEM.
+         */
+        [pbn_computone_4] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 0x40,
+                .reg_shift      = 2,
+                .first_offset   = 0x200,
+        },
+        [pbn_computone_6] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 6,
+                .base_baud      = 921600,
+                .uart_offset    = 0x40,
+                .reg_shift      = 2,
+                .first_offset   = 0x200,
+        },
+        [pbn_computone_8] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 921600,
+                .uart_offset    = 0x40,
+                .reg_shift      = 2,
+                .first_offset   = 0x200,
+        },
+        [pbn_sbsxrsio] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 460800,
+                .uart_offset    = 256,
+                .reg_shift      = 4,
+        },
+        /*
+         * Exar Corp. XR17C15[248] Dual/Quad/Octal UART
+         *  Only basic 16550A support.
+         *  XR17C15[24] are not tested, but they should work.
+         */
+        [pbn_exar_XR17C152] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 921600,
+                .uart_offset    = 0x200,
+        },
+        [pbn_exar_XR17C154] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 921600,
+                .uart_offset    = 0x200,
+        },
+        [pbn_exar_XR17C158] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 921600,
+                .uart_offset    = 0x200,
+        },
+        [pbn_exar_ibm_saturn] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 921600,
+                .uart_offset    = 0x200,
+        },
+
+        /*
+         * PA Semi PWRficient PA6T-1682M on-chip UART
+         */
+        [pbn_pasemi_1682M] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 8333333,
+        },
+        /*
+         * National Instruments 843x
+         */
+        [pbn_ni8430_16] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 16,
+                .base_baud      = 3686400,
+                .uart_offset    = 0x10,
+                .first_offset   = 0x800,
+        },
+        [pbn_ni8430_8] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 3686400,
+                .uart_offset    = 0x10,
+                .first_offset   = 0x800,
+        },
+        [pbn_ni8430_4] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 3686400,
+                .uart_offset    = 0x10,
+                .first_offset   = 0x800,
+        },
+        [pbn_ni8430_2] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 3686400,
+                .uart_offset    = 0x10,
+                .first_offset   = 0x800,
+        },
+        /*
+         * ADDI-DATA GmbH PCI-Express communication cards <info@addi-data.com>
+         */
+        [pbn_ADDIDATA_PCIe_1_3906250] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 3906250,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+        [pbn_ADDIDATA_PCIe_2_3906250] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 2,
+                .base_baud      = 3906250,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+        [pbn_ADDIDATA_PCIe_4_3906250] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 4,
+                .base_baud      = 3906250,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+        [pbn_ADDIDATA_PCIe_8_3906250] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 3906250,
+                .uart_offset    = 0x200,
+                .first_offset   = 0x1000,
+        },
+        [pbn_ce4100_1_115200] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 1,
+                .base_baud      = 921600,
+                .reg_shift      = 2,
+        },
+        [pbn_omegapci] = {
+                .flags          = FL_BASE0,
+                .num_ports      = 8,
+                .base_baud      = 115200,
+                .uart_offset    = 0x200,
+        },
+};
+
+static const struct pci_device_id softmodem_blacklist[] = {
+        { PCI_VDEVICE(AL, 0x5457), }, /* ALi Corporation M5457 AC'97 Modem */
+        { PCI_VDEVICE(MOTOROLA, 0x3052), }, /* Motorola Si3052-based modem */
+        { PCI_DEVICE(0x1543, 0x3052), }, /* Si3052-based modem, default IDs */
+};
+
+/*
+ * Given a complete unknown PCI device, try to use some heuristics to
+ * guess what the configuration might be, based on the pitiful PCI
+ * serial specs.  Returns 0 on success, 1 on failure.
+ */
+static int __devinit
+serial_pci_guess_board(struct pci_dev *dev, struct pciserial_board *board)
+{
+        const struct pci_device_id *blacklist;
+        int num_iomem, num_port, first_port = -1, i;
+
+        /*
+         * If it is not a communications device or the programming
+         * interface is greater than 6, give up.
+         *
+         * (Should we try to make guesses for multiport serial devices
+         * later?)
+         */
+        if ((((dev->class >> 8) != PCI_CLASS_COMMUNICATION_SERIAL) &&
+             ((dev->class >> 8) != PCI_CLASS_COMMUNICATION_MODEM)) ||
+            (dev->class & 0xff) > 6)
+                return -ENODEV;
+
+        /*
+         * Do not access blacklisted devices that are known not to
+         * feature serial ports.
+         */
+        for (blacklist = softmodem_blacklist;
+             blacklist < softmodem_blacklist + ARRAY_SIZE(softmodem_blacklist);
+             blacklist++) {
+                if (dev->vendor == blacklist->vendor &&
+                    dev->device == blacklist->device)
+                        return -ENODEV;
+        }
+
+        num_iomem = num_port = 0;
+        for (i = 0; i < PCI_NUM_BAR_RESOURCES; i++) {
+                if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
+                        num_port++;
+                        if (first_port == -1)
+                                first_port = i;
+                }
+                if (pci_resource_flags(dev, i) & IORESOURCE_MEM)
+                        num_iomem++;
+        }
+
+        /*
+         * If there is 1 or 0 iomem regions, and exactly one port,
+         * use it.  We guess the number of ports based on the IO
+         * region size.
+         */
+        if (num_iomem <= 1 && num_port == 1) {
+                board->flags = first_port;
+                board->num_ports = pci_resource_len(dev, first_port) / 8;
+                return 0;
+        }
+
+        /*
+         * Now guess if we've got a board which indexes by BARs.
+         * Each IO BAR should be 8 bytes, and they should follow
+         * consecutively.
+         */
+        first_port = -1;
+        num_port = 0;
+        for (i = 0; i < PCI_NUM_BAR_RESOURCES; i++) {
+                if (pci_resource_flags(dev, i) & IORESOURCE_IO &&
+                    pci_resource_len(dev, i) == 8 &&
+                    (first_port == -1 || (first_port + num_port) == i)) {
+                        num_port++;
+                        if (first_port == -1)
+                                first_port = i;
+                }
+        }
+
+        if (num_port > 1) {
+                board->flags = first_port | FL_BASE_BARS;
+                board->num_ports = num_port;
+                return 0;
+        }
+
+        return -ENODEV;
+}
+
+static inline int
+serial_pci_matches(const struct pciserial_board *board,
+                   const struct pciserial_board *guessed)
+{
+        return
+            board->num_ports == guessed->num_ports &&
+            board->base_baud == guessed->base_baud &&
+            board->uart_offset == guessed->uart_offset &&
+            board->reg_shift == guessed->reg_shift &&
+            board->first_offset == guessed->first_offset;
+}
+
+struct serial_private *
+pciserial_init_ports(struct pci_dev *dev, const struct pciserial_board *board)
+{
+        struct uart_port serial_port;
+        struct serial_private *priv;
+        struct pci_serial_quirk *quirk;
+        int rc, nr_ports, i;
+
+        nr_ports = board->num_ports;
+
+        /*
+         * Find an init and setup quirks.
+         */
+        quirk = find_quirk(dev);
+
+        /*
+         * Run the new-style initialization function.
+         * The initialization function returns:
+         *  <0  - error
+         *   0  - use board->num_ports
+         *  >0  - number of ports
+         */
+        if (quirk->init) {
+                rc = quirk->init(dev);
+                if (rc < 0) {
+                        priv = ERR_PTR(rc);
+                        goto err_out;
+                }
+                if (rc)
+                        nr_ports = rc;
+        }
+
+        priv = kzalloc(sizeof(struct serial_private) +
+                       sizeof(unsigned int) * nr_ports,
+                       GFP_KERNEL);
+        if (!priv) {
+                priv = ERR_PTR(-ENOMEM);
+                goto err_deinit;
+        }
+
+        priv->dev = dev;
+        priv->quirk = quirk;
+
+        memset(&serial_port, 0, sizeof(struct uart_port));
+        serial_port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
+        serial_port.uartclk = board->base_baud * 16;
+        serial_port.irq = get_pci_irq(dev, board);
+        serial_port.dev = &dev->dev;
+
+        for (i = 0; i < nr_ports; i++) {
+                if (quirk->setup(priv, board, &serial_port, i))
+                        break;
+
+#ifdef SERIAL_DEBUG_PCI
+                printk(KERN_DEBUG "Setup PCI port: port %lx, irq %d, type %d\n",
+                       serial_port.iobase, serial_port.irq, serial_port.iotype);
+#endif
+
+                priv->line[i] = serial8250_register_port(&serial_port);
+                if (priv->line[i] < 0) {
+                        printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), priv->line[i]);
+                        break;
+                }
+        }
+        priv->nr = i;
+        return priv;
+
+err_deinit:
+        if (quirk->exit)
+                quirk->exit(dev);
+err_out:
+        return priv;
+}
+EXPORT_SYMBOL_GPL(pciserial_init_ports);
+
+void pciserial_remove_ports(struct serial_private *priv)
+{
+        struct pci_serial_quirk *quirk;
+        int i;
+
+        for (i = 0; i < priv->nr; i++)
+                serial8250_unregister_port(priv->line[i]);
+
+        for (i = 0; i < PCI_NUM_BAR_RESOURCES; i++) {
+                if (priv->remapped_bar[i])
+                        iounmap(priv->remapped_bar[i]);
+                priv->remapped_bar[i] = NULL;
+        }
+
+        /*
+         * Find the exit quirks.
+         */
+        quirk = find_quirk(priv->dev);
+        if (quirk->exit)
+                quirk->exit(priv->dev);
+
+        kfree(priv);
+}
+EXPORT_SYMBOL_GPL(pciserial_remove_ports);
+
+void pciserial_suspend_ports(struct serial_private *priv)
+{
+        int i;
+
+        for (i = 0; i < priv->nr; i++)
+                if (priv->line[i] >= 0)
+                        serial8250_suspend_port(priv->line[i]);
+}
+EXPORT_SYMBOL_GPL(pciserial_suspend_ports);
+
+void pciserial_resume_ports(struct serial_private *priv)
+{
+        int i;
+
+        /*
+         * Ensure that the board is correctly configured.
+         */
+        if (priv->quirk->init)
+                priv->quirk->init(priv->dev);
+
+        for (i = 0; i < priv->nr; i++)
+                if (priv->line[i] >= 0)
+                        serial8250_resume_port(priv->line[i]);
+}
+EXPORT_SYMBOL_GPL(pciserial_resume_ports);
+
+/*
+ * Probe one serial board.  Unfortunately, there is no rhyme nor reason
+ * to the arrangement of serial ports on a PCI card.
+ */
+static int __devinit
+pciserial_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
+{
+        struct serial_private *priv;
+        const struct pciserial_board *board;
+        struct pciserial_board tmp;
+        int rc;
+
+        if (ent->driver_data >= ARRAY_SIZE(pci_boards)) {
+                printk(KERN_ERR "pci_init_one: invalid driver_data: %ld\n",
+                        ent->driver_data);
+                return -EINVAL;
+        }
+
+        board = &pci_boards[ent->driver_data];
+
+        rc = pci_enable_device(dev);
+        if (rc)
+                return rc;
+
+        if (ent->driver_data == pbn_default) {
+                /*
+                 * Use a copy of the pci_board entry for this;
+                 * avoid changing entries in the table.
+                 */
+                memcpy(&tmp, board, sizeof(struct pciserial_board));
+                board = &tmp;
+
+                /*
+                 * We matched one of our class entries.  Try to
+                 * determine the parameters of this board.
+                 */
+                rc = serial_pci_guess_board(dev, &tmp);
+                if (rc)
+                        goto disable;
+        } else {
+                /*
+                 * We matched an explicit entry.  If we are able to
+                 * detect this boards settings with our heuristic,
+                 * then we no longer need this entry.
+                 */
+                memcpy(&tmp, &pci_boards[pbn_default],
+                       sizeof(struct pciserial_board));
+                rc = serial_pci_guess_board(dev, &tmp);
+                if (rc == 0 && serial_pci_matches(board, &tmp))
+                        moan_device("Redundant entry in serial pci_table.",
+                                    dev);
+        }
+
+        priv = pciserial_init_ports(dev, board);
+        if (!IS_ERR(priv)) {
+                pci_set_drvdata(dev, priv);
+                return 0;
+        }
+
+        rc = PTR_ERR(priv);
+
+ disable:
+        pci_disable_device(dev);
+        return rc;
+}
+
+static void __devexit pciserial_remove_one(struct pci_dev *dev)
+{
+        struct serial_private *priv = pci_get_drvdata(dev);
+
+        pci_set_drvdata(dev, NULL);
+
+        pciserial_remove_ports(priv);
+
+        pci_disable_device(dev);
+}
+
+#ifdef CONFIG_PM
+static int pciserial_suspend_one(struct pci_dev *dev, pm_message_t state)
+{
+        struct serial_private *priv = pci_get_drvdata(dev);
+
+        if (priv)
+                pciserial_suspend_ports(priv);
+
+        pci_save_state(dev);
+        pci_set_power_state(dev, pci_choose_state(dev, state));
+        return 0;
+}
+
+static int pciserial_resume_one(struct pci_dev *dev)
+{
+        int err;
+        struct serial_private *priv = pci_get_drvdata(dev);
+
+        pci_set_power_state(dev, PCI_D0);
+        pci_restore_state(dev);
+
+        if (priv) {
+                /*
+                 * The device may have been disabled.  Re-enable it.
+                 */
+                err = pci_enable_device(dev);
+                /* FIXME: We cannot simply error out here */
+                if (err)
+                        printk(KERN_ERR "pciserial: Unable to re-enable ports, trying to continue.\n");
+                pciserial_resume_ports(priv);
+        }
+        return 0;
+}
+#endif
+
+static struct pci_device_id serial_pci_tbl[] = {
+        /* Advantech use PCI_DEVICE_ID_ADVANTECH_PCI3620 (0x3620) as 'PCI_SUBVENDOR_ID' */
+        {       PCI_VENDOR_ID_ADVANTECH, PCI_DEVICE_ID_ADVANTECH_PCI3620,
+                PCI_DEVICE_ID_ADVANTECH_PCI3620, 0x0001, 0, 0,
+                pbn_b2_8_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_232, 0, 0,
+                pbn_b1_8_1382400 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_232, 0, 0,
+                pbn_b1_4_1382400 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH2_232, 0, 0,
+                pbn_b1_2_1382400 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_232, 0, 0,
+                pbn_b1_8_1382400 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_232, 0, 0,
+                pbn_b1_4_1382400 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH2_232, 0, 0,
+                pbn_b1_2_1382400 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_485, 0, 0,
+                pbn_b1_8_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_485_4_4, 0, 0,
+                pbn_b1_8_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_485, 0, 0,
+                pbn_b1_4_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_485_2_2, 0, 0,
+                pbn_b1_4_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH2_485, 0, 0,
+                pbn_b1_2_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_485_2_6, 0, 0,
+                pbn_b1_8_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH081101V1, 0, 0,
+                pbn_b1_8_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH041101V1, 0, 0,
+                pbn_b1_4_921600 },
+        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_BH2_20MHZ, 0, 0,
+                pbn_b1_2_1250000 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI954,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_TITAN_2, 0, 0,
+                pbn_b0_2_1843200 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI954,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_TITAN_4, 0, 0,
+                pbn_b0_4_1843200 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI954,
+                PCI_VENDOR_ID_AFAVLAB,
+                PCI_SUBDEVICE_ID_AFAVLAB_P061, 0, 0,
+                pbn_b0_4_1152000 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C152,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_232, 0, 0,
+                pbn_b0_2_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C154,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_232, 0, 0,
+                pbn_b0_4_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C158,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_232, 0, 0,
+                pbn_b0_8_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C152,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_1_1, 0, 0,
+                pbn_b0_2_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C154,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_2, 0, 0,
+                pbn_b0_4_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C158,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4, 0, 0,
+                pbn_b0_8_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C152,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2, 0, 0,
+                pbn_b0_2_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C154,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4, 0, 0,
+                pbn_b0_4_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C158,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8, 0, 0,
+                pbn_b0_8_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C152,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_485, 0, 0,
+                pbn_b0_2_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C154,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_485, 0, 0,
+                pbn_b0_4_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C158,
+                PCI_SUBVENDOR_ID_CONNECT_TECH,
+                PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_485, 0, 0,
+                pbn_b0_8_1843200_200 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C152,
+                PCI_VENDOR_ID_IBM, PCI_SUBDEVICE_ID_IBM_SATURN_SERIAL_ONE_PORT,
+                0, 0, pbn_exar_ibm_saturn },
+
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_U530,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_1_115200 },
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_UCOMM2,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_115200 },
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_UCOMM422,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_4_115200 },
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_UCOMM232,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_115200 },
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_COMM4,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_4_115200 },
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_COMM8,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_8_115200 },
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_7803,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_8_460800 },
+        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_UCOMM8,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_8_115200 },
+
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_GTEK_SERIAL2,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_115200 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_SPCOM200,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_921600 },
+        /*
+         * VScom SPCOM800, from sl@s.pl
+         */
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_SPCOM800,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_8_921600 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_1077,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_4_921600 },
+        /* Unknown card - subdevice 0x1584 */
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_VENDOR_ID_PLX,
+                PCI_SUBDEVICE_ID_UNKNOWN_0x1584, 0, 0,
+                pbn_b0_4_115200 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_KEYSPAN,
+                PCI_SUBDEVICE_ID_KEYSPAN_SX2, 0, 0,
+                pbn_panacom },
+        {       PCI_VENDOR_ID_PANACOM, PCI_DEVICE_ID_PANACOM_QUADMODEM,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_panacom4 },
+        {       PCI_VENDOR_ID_PANACOM, PCI_DEVICE_ID_PANACOM_DUALMODEM,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_panacom2 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
+                PCI_VENDOR_ID_ESDGMBH,
+                PCI_DEVICE_ID_ESDGMBH_CPCIASIO4, 0, 0,
+                pbn_b2_4_115200 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
+                PCI_SUBDEVICE_ID_CHASE_PCIFAST4, 0, 0,
+                pbn_b2_4_460800 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
+                PCI_SUBDEVICE_ID_CHASE_PCIFAST8, 0, 0,
+                pbn_b2_8_460800 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
+                PCI_SUBDEVICE_ID_CHASE_PCIFAST16, 0, 0,
+                pbn_b2_16_460800 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
+                PCI_SUBDEVICE_ID_CHASE_PCIFAST16FMC, 0, 0,
+                pbn_b2_16_460800 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_CHASE_PCIRAS,
+                PCI_SUBDEVICE_ID_CHASE_PCIRAS4, 0, 0,
+                pbn_b2_4_460800 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_CHASE_PCIRAS,
+                PCI_SUBDEVICE_ID_CHASE_PCIRAS8, 0, 0,
+                pbn_b2_8_460800 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
+                PCI_SUBVENDOR_ID_EXSYS,
+                PCI_SUBDEVICE_ID_EXSYS_4055, 0, 0,
+                pbn_exsys_4055 },
+        /*
+         * Megawolf Romulus PCI Serial Card, from Mike Hudson
+         * (Exoray@isys.ca)
+         */
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_ROMULUS,
+                0x10b5, 0x106a, 0, 0,
+                pbn_plx_romulus },
+        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_QSC100,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_4_115200 },
+        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_DSC100,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_2_115200 },
+        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_ESC100D,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_8_115200 },
+        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_ESC100M,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_8_115200 },
+        {       PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_OXSEMI_16PCI954,
+                PCI_VENDOR_ID_SPECIALIX, PCI_SUBDEVICE_ID_SPECIALIX_SPEED4,
+                0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI954,
+                PCI_SUBVENDOR_ID_SIIG, PCI_SUBDEVICE_ID_SIIG_QUARTET_SERIAL,
+                0, 0,
+                pbn_b0_4_1152000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0x9505,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_921600 },
+
+                /*
+                 * The below card is a little controversial since it is the
+                 * subject of a PCI vendor/device ID clash.  (See
+                 * www.ussg.iu.edu/hypermail/linux/kernel/0303.1/0516.html).
+                 * For now just used the hex ID 0x950a.
+                 */
+        {       PCI_VENDOR_ID_OXSEMI, 0x950a,
+                PCI_SUBVENDOR_ID_SIIG, PCI_SUBDEVICE_ID_SIIG_DUAL_SERIAL, 0, 0,
+                pbn_b0_2_115200 },
+        {       PCI_VENDOR_ID_OXSEMI, 0x950a,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_2_1130000 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_C950,
+                PCI_VENDOR_ID_OXSEMI, PCI_SUBDEVICE_ID_OXSEMI_C950, 0, 0,
+                pbn_b0_1_921600 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI954,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_4_115200 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI952,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_921600 },
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI958,
+                PCI_ANY_ID , PCI_ANY_ID, 0, 0,
+                pbn_b2_8_1152000 },
+
+        /*
+         * Oxford Semiconductor Inc. Tornado PCI express device range.
+         */
+        {       PCI_VENDOR_ID_OXSEMI, 0xc101,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc105,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc11b,    /* OXPCIe952 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc11f,    /* OXPCIe952 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc120,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc124,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc138,    /* OXPCIe952 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc13d,    /* OXPCIe952 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc140,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc141,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc144,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc145,    /* OXPCIe952 1 Legacy UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc158,    /* OXPCIe952 2 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_2_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc15d,    /* OXPCIe952 2 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_2_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc208,    /* OXPCIe954 4 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_4_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc20d,    /* OXPCIe954 4 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_4_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc308,    /* OXPCIe958 8 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_8_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc30d,    /* OXPCIe958 8 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_8_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc40b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc40f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc41b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc41f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc42b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc42f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc43b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc43f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc44b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc44f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc45b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc45f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc46b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc46f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc47b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc47f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc48b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc48f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc49b,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc49f,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc4ab,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc4af,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc4bb,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc4bf,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc4cb,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_OXSEMI, 0xc4cf,    /* OXPCIe200 1 Native UART */
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        /*
+         * Mainpine Inc. IQ Express "Rev3" utilizing OxSemi Tornado
+         */
+        {       PCI_VENDOR_ID_MAINPINE, 0x4000, /* IQ Express 1 Port V.34 Super-G3 Fax */
+                PCI_VENDOR_ID_MAINPINE, 0x4001, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_MAINPINE, 0x4000, /* IQ Express 2 Port V.34 Super-G3 Fax */
+                PCI_VENDOR_ID_MAINPINE, 0x4002, 0, 0,
+                pbn_oxsemi_2_4000000 },
+        {       PCI_VENDOR_ID_MAINPINE, 0x4000, /* IQ Express 4 Port V.34 Super-G3 Fax */
+                PCI_VENDOR_ID_MAINPINE, 0x4004, 0, 0,
+                pbn_oxsemi_4_4000000 },
+        {       PCI_VENDOR_ID_MAINPINE, 0x4000, /* IQ Express 8 Port V.34 Super-G3 Fax */
+                PCI_VENDOR_ID_MAINPINE, 0x4008, 0, 0,
+                pbn_oxsemi_8_4000000 },
+
+        /*
+         * Digi/IBM PCIe 2-port Async EIA-232 Adapter utilizing OxSemi Tornado
+         */
+        {       PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_2_OX_IBM,
+                PCI_SUBVENDOR_ID_IBM, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_2_4000000 },
+
+        /*
+         * SBS Technologies, Inc. P-Octal and PMC-OCTPRO cards,
+         * from skokodyn@yahoo.com
+         */
+        {       PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+                PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_OCTPRO232, 0, 0,
+                pbn_sbsxrsio },
+        {       PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+                PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_OCTPRO422, 0, 0,
+                pbn_sbsxrsio },
+        {       PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+                PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_POCTAL232, 0, 0,
+                pbn_sbsxrsio },
+        {       PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+                PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_POCTAL422, 0, 0,
+                pbn_sbsxrsio },
+
+        /*
+         * Digitan DS560-558, from jimd@esoft.com
+         */
+        {       PCI_VENDOR_ID_ATT, PCI_DEVICE_ID_ATT_VENUS_MODEM,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_1_115200 },
+
+        /*
+         * Titan Electronic cards
+         *  The 400L and 800L have a custom setup quirk.
+         */
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_100,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_2_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_400,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800B,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_100L,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_1_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200L,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_2_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_400L,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_4_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800L,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_8_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200I,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b4_bt_2_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_400I,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b4_bt_4_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800I,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b4_bt_8_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_400EH,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800EH,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800EHB,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_100E,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_1_4000000 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200E,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_2_4000000 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_400E,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_4_4000000 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800E,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_8_4000000 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200EI,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_2_4000000 },
+        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200EISI,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi_2_4000000 },
+
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_10x_550,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_1_460800 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_10x_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_1_460800 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_10x_850,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_1_460800 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_10x_550,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_10x_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_10x_850,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_10x_550,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_4_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_10x_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_4_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_10x_850,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_4_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_20x_550,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_20x_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_20x_850,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_20x_550,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_20x_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_20x_850,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_20x_550,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_4_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_20x_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_4_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_20x_850,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_4_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_8S_20x_550,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_8_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_8S_20x_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_8_921600 },
+        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_8S_20x_850,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_8_921600 },
+
+        /*
+         * Computone devices submitted by Doug McNash dmcnash@computone.com
+         */
+        {       PCI_VENDOR_ID_COMPUTONE, PCI_DEVICE_ID_COMPUTONE_PG,
+                PCI_SUBVENDOR_ID_COMPUTONE, PCI_SUBDEVICE_ID_COMPUTONE_PG4,
+                0, 0, pbn_computone_4 },
+        {       PCI_VENDOR_ID_COMPUTONE, PCI_DEVICE_ID_COMPUTONE_PG,
+                PCI_SUBVENDOR_ID_COMPUTONE, PCI_SUBDEVICE_ID_COMPUTONE_PG8,
+                0, 0, pbn_computone_8 },
+        {       PCI_VENDOR_ID_COMPUTONE, PCI_DEVICE_ID_COMPUTONE_PG,
+                PCI_SUBVENDOR_ID_COMPUTONE, PCI_SUBDEVICE_ID_COMPUTONE_PG6,
+                0, 0, pbn_computone_6 },
+
+        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI95N,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_oxsemi },
+        {       PCI_VENDOR_ID_TIMEDIA, PCI_DEVICE_ID_TIMEDIA_1889,
+                PCI_VENDOR_ID_TIMEDIA, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_1_921600 },
+
+        /*
+         * AFAVLAB serial card, from Harald Welte <laforge@gnumonks.org>
+         */
+        {       PCI_VENDOR_ID_AFAVLAB, PCI_DEVICE_ID_AFAVLAB_P028,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_8_115200 },
+        {       PCI_VENDOR_ID_AFAVLAB, PCI_DEVICE_ID_AFAVLAB_P030,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_8_115200 },
+
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_DSERIAL,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_115200 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATRO_A,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_115200 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATRO_B,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_115200 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATTRO_A,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_115200 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATTRO_B,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_115200 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_OCTO_A,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_4_460800 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_OCTO_B,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_4_460800 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_PORT_PLUS,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_460800 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUAD_A,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_460800 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUAD_B,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_2_460800 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_SSERIAL,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_1_115200 },
+        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_PORT_650,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_bt_1_460800 },
+
+        /*
+         * Korenix Jetcard F0/F1 cards (JC1204, JC1208, JC1404, JC1408).
+         * Cards are identified by their subsystem vendor IDs, which
+         * (in hex) match the model number.
+         *
+         * Note that JC140x are RS422/485 cards which require ox950
+         * ACR = 0x10, and as such are not currently fully supported.
+         */
+        {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF0,
+                0x1204, 0x0004, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF0,
+                0x1208, 0x0004, 0, 0,
+                pbn_b0_4_921600 },
+/*      {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF0,
+                0x1402, 0x0002, 0, 0,
+                pbn_b0_2_921600 }, */
+/*      {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF0,
+                0x1404, 0x0004, 0, 0,
+                pbn_b0_4_921600 }, */
+        {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF1,
+                0x1208, 0x0004, 0, 0,
+                pbn_b0_4_921600 },
+
+        {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF2,
+                0x1204, 0x0004, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF2,
+                0x1208, 0x0004, 0, 0,
+                pbn_b0_4_921600 },
+        {       PCI_VENDOR_ID_KORENIX, PCI_DEVICE_ID_KORENIX_JETCARDF3,
+                0x1208, 0x0004, 0, 0,
+                pbn_b0_4_921600 },
+        /*
+         * Dell Remote Access Card 4 - Tim_T_Murphy@Dell.com
+         */
+        {       PCI_VENDOR_ID_DELL, PCI_DEVICE_ID_DELL_RAC4,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_1_1382400 },
+
+        /*
+         * Dell Remote Access Card III - Tim_T_Murphy@Dell.com
+         */
+        {       PCI_VENDOR_ID_DELL, PCI_DEVICE_ID_DELL_RACIII,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_1_1382400 },
+
+        /*
+         * RAStel 2 port modem, gerg@moreton.com.au
+         */
+        {       PCI_VENDOR_ID_MORETON, PCI_DEVICE_ID_RASTEL_2PORT,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_bt_2_115200 },
+
+        /*
+         * EKF addition for i960 Boards form EKF with serial port
+         */
+        {       PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_80960_RP,
+                0xE4BF, PCI_ANY_ID, 0, 0,
+                pbn_intel_i960 },
+
+        /*
+         * Xircom Cardbus/Ethernet combos
+         */
+        {       PCI_VENDOR_ID_XIRCOM, PCI_DEVICE_ID_XIRCOM_X3201_MDM,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_115200 },
+        /*
+         * Xircom RBM56G cardbus modem - Dirk Arnold (temp entry)
+         */
+        {       PCI_VENDOR_ID_XIRCOM, PCI_DEVICE_ID_XIRCOM_RBM56G,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_115200 },
+
+        /*
+         * Untested PCI modems, sent in from various folks...
+         */
+
+        /*
+         * Elsa Model 56K PCI Modem, from Andreas Rath <arh@01019freenet.de>
+         */
+        {       PCI_VENDOR_ID_ROCKWELL, 0x1004,
+                0x1048, 0x1500, 0, 0,
+                pbn_b1_1_115200 },
+
+        {       PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
+                0xFF00, 0, 0, 0,
+                pbn_sgi_ioc3 },
+
+        /*
+         * HP Diva card
+         */
+        {       PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_DIVA,
+                PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_DIVA_RMP3, 0, 0,
+                pbn_b1_1_115200 },
+        {       PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_DIVA,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_5_115200 },
+        {       PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_DIVA_AUX,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b2_1_115200 },
+
+        {       PCI_VENDOR_ID_DCI, PCI_DEVICE_ID_DCI_PCCOM2,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b3_2_115200 },
+        {       PCI_VENDOR_ID_DCI, PCI_DEVICE_ID_DCI_PCCOM4,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b3_4_115200 },
+        {       PCI_VENDOR_ID_DCI, PCI_DEVICE_ID_DCI_PCCOM8,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b3_8_115200 },
+
+        /*
+         * Exar Corp. XR17C15[248] Dual/Quad/Octal UART
+         */
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C152,
+                PCI_ANY_ID, PCI_ANY_ID,
+                0,
+                0, pbn_exar_XR17C152 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C154,
+                PCI_ANY_ID, PCI_ANY_ID,
+                0,
+                0, pbn_exar_XR17C154 },
+        {       PCI_VENDOR_ID_EXAR, PCI_DEVICE_ID_EXAR_XR17C158,
+                PCI_ANY_ID, PCI_ANY_ID,
+                0,
+                0, pbn_exar_XR17C158 },
+
+        /*
+         * Topic TP560 Data/Fax/Voice 56k modem (reported by Evan Clarke)
+         */
+        {       PCI_VENDOR_ID_TOPIC, PCI_DEVICE_ID_TOPIC_TP560,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b0_1_115200 },
+        /*
+         * ITE
+         */
+        {       PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8872,
+                PCI_ANY_ID, PCI_ANY_ID,
+                0, 0,
+                pbn_b1_bt_1_115200 },
+
+        /*
+         * IntaShield IS-200
+         */
+        {       PCI_VENDOR_ID_INTASHIELD, PCI_DEVICE_ID_INTASHIELD_IS200,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,   /* 135a.0811 */
+                pbn_b2_2_115200 },
+        /*
+         * IntaShield IS-400
+         */
+        {       PCI_VENDOR_ID_INTASHIELD, PCI_DEVICE_ID_INTASHIELD_IS400,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,    /* 135a.0dc0 */
+                pbn_b2_4_115200 },
+        /*
+         * Perle PCI-RAS cards
+         */
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
+                PCI_SUBVENDOR_ID_PERLE, PCI_SUBDEVICE_ID_PCI_RAS4,
+                0, 0, pbn_b2_4_921600 },
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9030,
+                PCI_SUBVENDOR_ID_PERLE, PCI_SUBDEVICE_ID_PCI_RAS8,
+                0, 0, pbn_b2_8_921600 },
+
+        /*
+         * Mainpine series cards: Fairly standard layout but fools
+         * parts of the autodetect in some cases and uses otherwise
+         * unmatched communications subclasses in the PCI Express case
+         */
+
+        {       /* RockForceDUO */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0200,
+                0, 0, pbn_b0_2_115200 },
+        {       /* RockForceQUATRO */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0300,
+                0, 0, pbn_b0_4_115200 },
+        {       /* RockForceDUO+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0400,
+                0, 0, pbn_b0_2_115200 },
+        {       /* RockForceQUATRO+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0500,
+                0, 0, pbn_b0_4_115200 },
+        {       /* RockForce+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0600,
+                0, 0, pbn_b0_2_115200 },
+        {       /* RockForce+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0700,
+                0, 0, pbn_b0_4_115200 },
+        {       /* RockForceOCTO+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0800,
+                0, 0, pbn_b0_8_115200 },
+        {       /* RockForceDUO+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0C00,
+                0, 0, pbn_b0_2_115200 },
+        {       /* RockForceQUARTRO+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x0D00,
+                0, 0, pbn_b0_4_115200 },
+        {       /* RockForceOCTO+ */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x1D00,
+                0, 0, pbn_b0_8_115200 },
+        {       /* RockForceD1 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2000,
+                0, 0, pbn_b0_1_115200 },
+        {       /* RockForceF1 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2100,
+                0, 0, pbn_b0_1_115200 },
+        {       /* RockForceD2 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2200,
+                0, 0, pbn_b0_2_115200 },
+        {       /* RockForceF2 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2300,
+                0, 0, pbn_b0_2_115200 },
+        {       /* RockForceD4 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2400,
+                0, 0, pbn_b0_4_115200 },
+        {       /* RockForceF4 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2500,
+                0, 0, pbn_b0_4_115200 },
+        {       /* RockForceD8 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2600,
+                0, 0, pbn_b0_8_115200 },
+        {       /* RockForceF8 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x2700,
+                0, 0, pbn_b0_8_115200 },
+        {       /* IQ Express D1 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3000,
+                0, 0, pbn_b0_1_115200 },
+        {       /* IQ Express F1 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3100,
+                0, 0, pbn_b0_1_115200 },
+        {       /* IQ Express D2 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3200,
+                0, 0, pbn_b0_2_115200 },
+        {       /* IQ Express F2 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3300,
+                0, 0, pbn_b0_2_115200 },
+        {       /* IQ Express D4 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3400,
+                0, 0, pbn_b0_4_115200 },
+        {       /* IQ Express F4 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3500,
+                0, 0, pbn_b0_4_115200 },
+        {       /* IQ Express D8 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3C00,
+                0, 0, pbn_b0_8_115200 },
+        {       /* IQ Express F8 */
+                PCI_VENDOR_ID_MAINPINE, PCI_DEVICE_ID_MAINPINE_PBRIDGE,
+                PCI_VENDOR_ID_MAINPINE, 0x3D00,
+                0, 0, pbn_b0_8_115200 },
+
+
+        /*
+         * PA Semi PA6T-1682M on-chip UART
+         */
+        {       PCI_VENDOR_ID_PASEMI, 0xa004,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_pasemi_1682M },
+
+        /*
+         * National Instruments
+         */
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI23216,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_16_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI2328,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_8_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI2324,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_4_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI2322,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_2_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI2324I,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_4_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI2322I,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_2_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8420_23216,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_16_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8420_2328,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_8_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8420_2324,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_4_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8420_2322,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_2_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8422_2324,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_4_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8422_2322,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_b1_bt_2_115200 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8430_2322,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_2 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI8430_2322,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_2 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8430_2324,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_4 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI8430_2324,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_4 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8430_2328,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_8 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI8430_2328,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_8 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8430_23216,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_16 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI8430_23216,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_16 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8432_2322,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_2 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI8432_2322,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_2 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8432_2324,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_4 },
+        {       PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI8432_2324,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_ni8430_4 },
+
+        /*
+        * ADDI-DATA GmbH communication cards <info@addi-data.com>
+        */
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7500,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_4_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7420,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_2_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7300,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_1_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA_OLD,
+                PCI_DEVICE_ID_ADDIDATA_APCI7800,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b1_8_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7500_2,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_4_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7420_2,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_2_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7300_2,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_1_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7500_3,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_4_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7420_3,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_2_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7300_3,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_1_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCI7800_3,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_b0_8_115200 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCIe7500,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_ADDIDATA_PCIe_4_3906250 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCIe7420,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_ADDIDATA_PCIe_2_3906250 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCIe7300,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_ADDIDATA_PCIe_1_3906250 },
+
+        {       PCI_VENDOR_ID_ADDIDATA,
+                PCI_DEVICE_ID_ADDIDATA_APCIe7800,
+                PCI_ANY_ID,
+                PCI_ANY_ID,
+                0,
+                0,
+                pbn_ADDIDATA_PCIe_8_3906250 },
+
+        {       PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9835,
+                PCI_VENDOR_ID_IBM, 0x0299,
+                0, 0, pbn_b0_bt_2_115200 },
+
+        {       PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9901,
+                0xA000, 0x1000,
+                0, 0, pbn_b0_1_115200 },
+
+        /*
+         * Best Connectivity PCI Multi I/O cards
+         */
+
+        {       PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9865,
+                0xA000, 0x1000,
+                0, 0, pbn_b0_1_115200 },
+
+        {       PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9865,
+                0xA000, 0x3004,
+                0, 0, pbn_b0_bt_4_115200 },
+        /* Intel CE4100 */
+        {       PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CE4100_UART,
+                PCI_ANY_ID,  PCI_ANY_ID, 0, 0,
+                pbn_ce4100_1_115200 },
+
+        /*
+         * Cronyx Omega PCI
+         */
+        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_CRONYX_OMEGA,
+                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+                pbn_omegapci },
+
+        /*
+         * These entries match devices with class COMMUNICATION_SERIAL,
+         * COMMUNICATION_MODEM or COMMUNICATION_MULTISERIAL
+         */
+        {       PCI_ANY_ID, PCI_ANY_ID,
+                PCI_ANY_ID, PCI_ANY_ID,
+                PCI_CLASS_COMMUNICATION_SERIAL << 8,
+                0xffff00, pbn_default },
+        {       PCI_ANY_ID, PCI_ANY_ID,
+                PCI_ANY_ID, PCI_ANY_ID,
+                PCI_CLASS_COMMUNICATION_MODEM << 8,
+                0xffff00, pbn_default },
+        {       PCI_ANY_ID, PCI_ANY_ID,
+                PCI_ANY_ID, PCI_ANY_ID,
+                PCI_CLASS_COMMUNICATION_MULTISERIAL << 8,
+                0xffff00, pbn_default },
+        { 0, }
+};
+
+static struct pci_driver serial_pci_driver = {
+        .name           = "serial",
+        .probe          = pciserial_init_one,
+        .remove         = __devexit_p(pciserial_remove_one),
+#ifdef CONFIG_PM
+        .suspend        = pciserial_suspend_one,
+        .resume         = pciserial_resume_one,
+#endif
+        .id_table       = serial_pci_tbl,
+};
+
+static int __init serial8250_pci_init(void)
+{
+        return pci_register_driver(&serial_pci_driver);
+}
+
+static void __exit serial8250_pci_exit(void)
+{
+        pci_unregister_driver(&serial_pci_driver);
+}
+
+module_init(serial8250_pci_init);
+module_exit(serial8250_pci_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic 8250/16x50 PCI serial probe module");
+MODULE_DEVICE_TABLE(pci, serial_pci_tbl);
diff --git a/drivers/tty/serial/8250_pnp.c b/drivers/tty/serial/8250_pnp.c
new file mode 100644
index 000000000000..fc301f6722e1
--- /dev/null
+++ b/drivers/tty/serial/8250_pnp.c
@@ -0,0 +1,521 @@
+/*
+ *  Probe module for 8250/16550-type ISAPNP serial ports.
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright (C) 2001 Russell King, All Rights Reserved.
+ *
+ *  Ported to the Linux PnP Layer - (C) Adam Belay.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/pnp.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/serial_core.h>
+#include <linux/bitops.h>
+
+#include <asm/byteorder.h>
+
+#include "8250.h"
+
+#define UNKNOWN_DEV 0x3000
+
+
+static const struct pnp_device_id pnp_dev_table[] = {
+        /* Archtek America Corp. */
+        /* Archtek SmartLink Modem 3334BT Plug & Play */
+        {       "AAC000F",              0       },
+        /* Anchor Datacomm BV */
+        /* SXPro 144 External Data Fax Modem Plug & Play */
+        {       "ADC0001",              0       },
+        /* SXPro 288 External Data Fax Modem Plug & Play */
+        {       "ADC0002",              0       },
+        /* PROLiNK 1456VH ISA PnP K56flex Fax Modem */
+        {       "AEI0250",              0       },
+        /* Actiontec ISA PNP 56K X2 Fax Modem */
+        {       "AEI1240",              0       },
+        /* Rockwell 56K ACF II Fax+Data+Voice Modem */
+        {       "AKY1021",              0 /*SPCI_FL_NO_SHIRQ*/  },
+        /* AZT3005 PnP SOUND DEVICE */
+        {       "AZT4001",              0       },
+        /* Best Data Products Inc. Smart One 336F PnP Modem */
+        {       "BDP3336",              0       },
+        /*  Boca Research */
+        /* Boca Complete Ofc Communicator 14.4 Data-FAX */
+        {       "BRI0A49",              0       },
+        /* Boca Research 33,600 ACF Modem */
+        {       "BRI1400",              0       },
+        /* Boca 33.6 Kbps Internal FD34FSVD */
+        {       "BRI3400",              0       },
+        /* Boca 33.6 Kbps Internal FD34FSVD */
+        {       "BRI0A49",              0       },
+        /* Best Data Products Inc. Smart One 336F PnP Modem */
+        {       "BDP3336",              0       },
+        /* Computer Peripherals Inc */
+        /* EuroViVa CommCenter-33.6 SP PnP */
+        {       "CPI4050",              0       },
+        /* Creative Labs */
+        /* Creative Labs Phone Blaster 28.8 DSVD PnP Voice */
+        {       "CTL3001",              0       },
+        /* Creative Labs Modem Blaster 28.8 DSVD PnP Voice */
+        {       "CTL3011",              0       },
+        /* Davicom ISA 33.6K Modem */
+        {       "DAV0336",              0       },
+        /* Creative */
+        /* Creative Modem Blaster Flash56 DI5601-1 */
+        {       "DMB1032",              0       },
+        /* Creative Modem Blaster V.90 DI5660 */
+        {       "DMB2001",              0       },
+        /* E-Tech */
+        /* E-Tech CyberBULLET PC56RVP */
+        {       "ETT0002",              0       },
+        /* FUJITSU */
+        /* Fujitsu 33600 PnP-I2 R Plug & Play */
+        {       "FUJ0202",              0       },
+        /* Fujitsu FMV-FX431 Plug & Play */
+        {       "FUJ0205",              0       },
+        /* Fujitsu 33600 PnP-I4 R Plug & Play */
+        {       "FUJ0206",              0       },
+        /* Fujitsu Fax Voice 33600 PNP-I5 R Plug & Play */
+        {       "FUJ0209",              0       },
+        /* Archtek America Corp. */
+        /* Archtek SmartLink Modem 3334BT Plug & Play */
+        {       "GVC000F",              0       },
+        /* Archtek SmartLink Modem 3334BRV 33.6K Data Fax Voice */
+        {       "GVC0303",              0       },
+        /* Hayes */
+        /* Hayes Optima 288 V.34-V.FC + FAX + Voice Plug & Play */
+        {       "HAY0001",              0       },
+        /* Hayes Optima 336 V.34 + FAX + Voice PnP */
+        {       "HAY000C",              0       },
+        /* Hayes Optima 336B V.34 + FAX + Voice PnP */
+        {       "HAY000D",              0       },
+        /* Hayes Accura 56K Ext Fax Modem PnP */
+        {       "HAY5670",              0       },
+        /* Hayes Accura 56K Ext Fax Modem PnP */
+        {       "HAY5674",              0       },
+        /* Hayes Accura 56K Fax Modem PnP */
+        {       "HAY5675",              0       },
+        /* Hayes 288, V.34 + FAX */
+        {       "HAYF000",              0       },
+        /* Hayes Optima 288 V.34 + FAX + Voice, Plug & Play */
+        {       "HAYF001",              0       },
+        /* IBM */
+        /* IBM Thinkpad 701 Internal Modem Voice */
+        {       "IBM0033",              0       },
+        /* Intertex */
+        /* Intertex 28k8 33k6 Voice EXT PnP */
+        {       "IXDC801",              0       },
+        /* Intertex 33k6 56k Voice EXT PnP */
+        {       "IXDC901",              0       },
+        /* Intertex 28k8 33k6 Voice SP EXT PnP */
+        {       "IXDD801",              0       },
+        /* Intertex 33k6 56k Voice SP EXT PnP */
+        {       "IXDD901",              0       },
+        /* Intertex 28k8 33k6 Voice SP INT PnP */
+        {       "IXDF401",              0       },
+        /* Intertex 28k8 33k6 Voice SP EXT PnP */
+        {       "IXDF801",              0       },
+        /* Intertex 33k6 56k Voice SP EXT PnP */
+        {       "IXDF901",              0       },
+        /* Kortex International */
+        /* KORTEX 28800 Externe PnP */
+        {       "KOR4522",              0       },
+        /* KXPro 33.6 Vocal ASVD PnP */
+        {       "KORF661",              0       },
+        /* Lasat */
+        /* LASAT Internet 33600 PnP */
+        {       "LAS4040",              0       },
+        /* Lasat Safire 560 PnP */
+        {       "LAS4540",              0       },
+        /* Lasat Safire 336  PnP */
+        {       "LAS5440",              0       },
+        /* Microcom, Inc. */
+        /* Microcom TravelPorte FAST V.34 Plug & Play */
+        {       "MNP0281",              0       },
+        /* Microcom DeskPorte V.34 FAST or FAST+ Plug & Play */
+        {       "MNP0336",              0       },
+        /* Microcom DeskPorte FAST EP 28.8 Plug & Play */
+        {       "MNP0339",              0       },
+        /* Microcom DeskPorte 28.8P Plug & Play */
+        {       "MNP0342",              0       },
+        /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
+        {       "MNP0500",              0       },
+        /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
+        {       "MNP0501",              0       },
+        /* Microcom DeskPorte 28.8S Internal Plug & Play */
+        {       "MNP0502",              0       },
+        /* Motorola */
+        /* Motorola BitSURFR Plug & Play */
+        {       "MOT1105",              0       },
+        /* Motorola TA210 Plug & Play */
+        {       "MOT1111",              0       },
+        /* Motorola HMTA 200 (ISDN) Plug & Play */
+        {       "MOT1114",              0       },
+        /* Motorola BitSURFR Plug & Play */
+        {       "MOT1115",              0       },
+        /* Motorola Lifestyle 28.8 Internal */
+        {       "MOT1190",              0       },
+        /* Motorola V.3400 Plug & Play */
+        {       "MOT1501",              0       },
+        /* Motorola Lifestyle 28.8 V.34 Plug & Play */
+        {       "MOT1502",              0       },
+        /* Motorola Power 28.8 V.34 Plug & Play */
+        {       "MOT1505",              0       },
+        /* Motorola ModemSURFR External 28.8 Plug & Play */
+        {       "MOT1509",              0       },
+        /* Motorola Premier 33.6 Desktop Plug & Play */
+        {       "MOT150A",              0       },
+        /* Motorola VoiceSURFR 56K External PnP */
+        {       "MOT150F",              0       },
+        /* Motorola ModemSURFR 56K External PnP */
+        {       "MOT1510",              0       },
+        /* Motorola ModemSURFR 56K Internal PnP */
+        {       "MOT1550",              0       },
+        /* Motorola ModemSURFR Internal 28.8 Plug & Play */
+        {       "MOT1560",              0       },
+        /* Motorola Premier 33.6 Internal Plug & Play */
+        {       "MOT1580",              0       },
+        /* Motorola OnlineSURFR 28.8 Internal Plug & Play */
+        {       "MOT15B0",              0       },
+        /* Motorola VoiceSURFR 56K Internal PnP */
+        {       "MOT15F0",              0       },
+        /* Com 1 */
+        /*  Deskline K56 Phone System PnP */
+        {       "MVX00A1",              0       },
+        /* PC Rider K56 Phone System PnP */
+        {       "MVX00F2",              0       },
+        /* NEC 98NOTE SPEAKER PHONE FAX MODEM(33600bps) */
+        {       "nEC8241",              0       },
+        /* Pace 56 Voice Internal Plug & Play Modem */
+        {       "PMC2430",              0       },
+        /* Generic */
+        /* Generic standard PC COM port  */
+        {       "PNP0500",              0       },
+        /* Generic 16550A-compatible COM port */
+        {       "PNP0501",              0       },
+        /* Compaq 14400 Modem */
+        {       "PNPC000",              0       },
+        /* Compaq 2400/9600 Modem */
+        {       "PNPC001",              0       },
+        /* Dial-Up Networking Serial Cable between 2 PCs */
+        {       "PNPC031",              0       },
+        /* Dial-Up Networking Parallel Cable between 2 PCs */
+        {       "PNPC032",              0       },
+        /* Standard 9600 bps Modem */
+        {       "PNPC100",              0       },
+        /* Standard 14400 bps Modem */
+        {       "PNPC101",              0       },
+        /*  Standard 28800 bps Modem*/
+        {       "PNPC102",              0       },
+        /*  Standard Modem*/
+        {       "PNPC103",              0       },
+        /*  Standard 9600 bps Modem*/
+        {       "PNPC104",              0       },
+        /*  Standard 14400 bps Modem*/
+        {       "PNPC105",              0       },
+        /*  Standard 28800 bps Modem*/
+        {       "PNPC106",              0       },
+        /*  Standard Modem */
+        {       "PNPC107",              0       },
+        /* Standard 9600 bps Modem */
+        {       "PNPC108",              0       },
+        /* Standard 14400 bps Modem */
+        {       "PNPC109",              0       },
+        /* Standard 28800 bps Modem */
+        {       "PNPC10A",              0       },
+        /* Standard Modem */
+        {       "PNPC10B",              0       },
+        /* Standard 9600 bps Modem */
+        {       "PNPC10C",              0       },
+        /* Standard 14400 bps Modem */
+        {       "PNPC10D",              0       },
+        /* Standard 28800 bps Modem */
+        {       "PNPC10E",              0       },
+        /* Standard Modem */
+        {       "PNPC10F",              0       },
+        /* Standard PCMCIA Card Modem */
+        {       "PNP2000",              0       },
+        /* Rockwell */
+        /* Modular Technology */
+        /* Rockwell 33.6 DPF Internal PnP */
+        /* Modular Technology 33.6 Internal PnP */
+        {       "ROK0030",              0       },
+        /* Kortex International */
+        /* KORTEX 14400 Externe PnP */
+        {       "ROK0100",              0       },
+        /* Rockwell 28.8 */
+        {       "ROK4120",              0       },
+        /* Viking Components, Inc */
+        /* Viking 28.8 INTERNAL Fax+Data+Voice PnP */
+        {       "ROK4920",              0       },
+        /* Rockwell */
+        /* British Telecom */
+        /* Modular Technology */
+        /* Rockwell 33.6 DPF External PnP */
+        /* BT Prologue 33.6 External PnP */
+        /* Modular Technology 33.6 External PnP */
+        {       "RSS00A0",              0       },
+        /* Viking 56K FAX INT */
+        {       "RSS0262",              0       },
+        /* K56 par,VV,Voice,Speakphone,AudioSpan,PnP */
+        {       "RSS0250",              0       },
+        /* SupraExpress 28.8 Data/Fax PnP modem */
+        {       "SUP1310",              0       },
+        /* SupraExpress 336i PnP Voice Modem */
+        {       "SUP1381",              0       },
+        /* SupraExpress 33.6 Data/Fax PnP modem */
+        {       "SUP1421",              0       },
+        /* SupraExpress 33.6 Data/Fax PnP modem */
+        {       "SUP1590",              0       },
+        /* SupraExpress 336i Sp ASVD */
+        {       "SUP1620",              0       },
+        /* SupraExpress 33.6 Data/Fax PnP modem */
+        {       "SUP1760",              0       },
+        /* SupraExpress 56i Sp Intl */
+        {       "SUP2171",              0       },
+        /* Phoebe Micro */
+        /* Phoebe Micro 33.6 Data Fax 1433VQH Plug & Play */
+        {       "TEX0011",              0       },
+        /* Archtek America Corp. */
+        /* Archtek SmartLink Modem 3334BT Plug & Play */
+        {       "UAC000F",              0       },
+        /* 3Com Corp. */
+        /* Gateway Telepath IIvi 33.6 */
+        {       "USR0000",              0       },
+        /* U.S. Robotics Sporster 33.6K Fax INT PnP */
+        {       "USR0002",              0       },
+        /*  Sportster Vi 14.4 PnP FAX Voicemail */
+        {       "USR0004",              0       },
+        /* U.S. Robotics 33.6K Voice INT PnP */
+        {       "USR0006",              0       },
+        /* U.S. Robotics 33.6K Voice EXT PnP */
+        {       "USR0007",              0       },
+        /* U.S. Robotics Courier V.Everything INT PnP */
+        {       "USR0009",              0       },
+        /* U.S. Robotics 33.6K Voice INT PnP */
+        {       "USR2002",              0       },
+        /* U.S. Robotics 56K Voice INT PnP */
+        {       "USR2070",              0       },
+        /* U.S. Robotics 56K Voice EXT PnP */
+        {       "USR2080",              0       },
+        /* U.S. Robotics 56K FAX INT */
+        {       "USR3031",              0       },
+        /* U.S. Robotics 56K FAX INT */
+        {       "USR3050",              0       },
+        /* U.S. Robotics 56K Voice INT PnP */
+        {       "USR3070",              0       },
+        /* U.S. Robotics 56K Voice EXT PnP */
+        {       "USR3080",              0       },
+        /* U.S. Robotics 56K Voice INT PnP */
+        {       "USR3090",              0       },
+        /* U.S. Robotics 56K Message  */
+        {       "USR9100",              0       },
+        /* U.S. Robotics 56K FAX EXT PnP*/
+        {       "USR9160",              0       },
+        /* U.S. Robotics 56K FAX INT PnP*/
+        {       "USR9170",              0       },
+        /* U.S. Robotics 56K Voice EXT PnP*/
+        {       "USR9180",              0       },
+        /* U.S. Robotics 56K Voice INT PnP*/
+        {       "USR9190",              0       },
+        /* Wacom tablets */
+        {       "WACFXXX",              0       },
+        /* Compaq touchscreen */
+        {       "FPI2002",              0 },
+        /* Fujitsu Stylistic touchscreens */
+        {       "FUJ02B2",              0 },
+        {       "FUJ02B3",              0 },
+        /* Fujitsu Stylistic LT touchscreens */
+        {       "FUJ02B4",              0 },
+        /* Passive Fujitsu Stylistic touchscreens */
+        {       "FUJ02B6",              0 },
+        {       "FUJ02B7",              0 },
+        {       "FUJ02B8",              0 },
+        {       "FUJ02B9",              0 },
+        {       "FUJ02BC",              0 },
+        /* Fujitsu Wacom Tablet PC device */
+        {       "FUJ02E5",              0       },
+        /* Fujitsu P-series tablet PC device */
+        {       "FUJ02E6",              0       },
+        /* Fujitsu Wacom 2FGT Tablet PC device */
+        {       "FUJ02E7",              0       },
+        /* Fujitsu Wacom 1FGT Tablet PC device */
+        {       "FUJ02E9",              0       },
+        /*
+         * LG C1 EXPRESS DUAL (C1-PB11A3) touch screen (actually a FUJ02E6 in
+         * disguise)
+         */
+        {       "LTS0001",              0       },
+        /* Rockwell's (PORALiNK) 33600 INT PNP */
+        {       "WCI0003",              0       },
+        /* Unknown PnP modems */
+        {       "PNPCXXX",              UNKNOWN_DEV     },
+        /* More unknown PnP modems */
+        {       "PNPDXXX",              UNKNOWN_DEV     },
+        {       "",                     0       }
+};
+
+MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
+
+static char *modem_names[] __devinitdata = {
+        "MODEM", "Modem", "modem", "FAX", "Fax", "fax",
+        "56K", "56k", "K56", "33.6", "28.8", "14.4",
+        "33,600", "28,800", "14,400", "33.600", "28.800", "14.400",
+        "33600", "28800", "14400", "V.90", "V.34", "V.32", NULL
+};
+
+static int __devinit check_name(char *name)
+{
+        char **tmp;
+
+        for (tmp = modem_names; *tmp; tmp++)
+                if (strstr(name, *tmp))
+                        return 1;
+
+        return 0;
+}
+
+static int __devinit check_resources(struct pnp_dev *dev)
+{
+        resource_size_t base[] = {0x2f8, 0x3f8, 0x2e8, 0x3e8};
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(base); i++) {
+                if (pnp_possible_config(dev, IORESOURCE_IO, base[i], 8))
+                        return 1;
+        }
+
+        return 0;
+}
+
+/*
+ * Given a complete unknown PnP device, try to use some heuristics to
+ * detect modems. Currently use such heuristic set:
+ *     - dev->name or dev->bus->name must contain "modem" substring;
+ *     - device must have only one IO region (8 byte long) with base address
+ *       0x2e8, 0x3e8, 0x2f8 or 0x3f8.
+ *
+ * Such detection looks very ugly, but can detect at least some of numerous
+ * PnP modems, alternatively we must hardcode all modems in pnp_devices[]
+ * table.
+ */
+static int __devinit serial_pnp_guess_board(struct pnp_dev *dev, int *flags)
+{
+        if (!(check_name(pnp_dev_name(dev)) ||
+                (dev->card && check_name(dev->card->name))))
+                        return -ENODEV;
+
+        if (check_resources(dev))
+                return 0;
+
+        return -ENODEV;
+}
+
+static int __devinit
+serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
+{
+        struct uart_port port;
+        int ret, line, flags = dev_id->driver_data;
+
+        if (flags & UNKNOWN_DEV) {
+                ret = serial_pnp_guess_board(dev, &flags);
+                if (ret < 0)
+                        return ret;
+        }
+
+        memset(&port, 0, sizeof(struct uart_port));
+        if (pnp_irq_valid(dev, 0))
+                port.irq = pnp_irq(dev, 0);
+        if (pnp_port_valid(dev, 0)) {
+                port.iobase = pnp_port_start(dev, 0);
+                port.iotype = UPIO_PORT;
+        } else if (pnp_mem_valid(dev, 0)) {
+                port.mapbase = pnp_mem_start(dev, 0);
+                port.iotype = UPIO_MEM;
+                port.flags = UPF_IOREMAP;
+        } else
+                return -ENODEV;
+
+#ifdef SERIAL_DEBUG_PNP
+        printk(KERN_DEBUG
+                "Setup PNP port: port %x, mem 0x%lx, irq %d, type %d\n",
+                       port.iobase, port.mapbase, port.irq, port.iotype);
+#endif
+
+        port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
+        if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
+                port.flags |= UPF_SHARE_IRQ;
+        port.uartclk = 1843200;
+        port.dev = &dev->dev;
+
+        line = serial8250_register_port(&port);
+        if (line < 0)
+                return -ENODEV;
+
+        pnp_set_drvdata(dev, (void *)((long)line + 1));
+        return 0;
+}
+
+static void __devexit serial_pnp_remove(struct pnp_dev *dev)
+{
+        long line = (long)pnp_get_drvdata(dev);
+        if (line)
+                serial8250_unregister_port(line - 1);
+}
+
+#ifdef CONFIG_PM
+static int serial_pnp_suspend(struct pnp_dev *dev, pm_message_t state)
+{
+        long line = (long)pnp_get_drvdata(dev);
+
+        if (!line)
+                return -ENODEV;
+        serial8250_suspend_port(line - 1);
+        return 0;
+}
+
+static int serial_pnp_resume(struct pnp_dev *dev)
+{
+        long line = (long)pnp_get_drvdata(dev);
+
+        if (!line)
+                return -ENODEV;
+        serial8250_resume_port(line - 1);
+        return 0;
+}
+#else
+#define serial_pnp_suspend NULL
+#define serial_pnp_resume NULL
+#endif /* CONFIG_PM */
+
+static struct pnp_driver serial_pnp_driver = {
+        .name           = "serial",
+        .probe          = serial_pnp_probe,
+        .remove         = __devexit_p(serial_pnp_remove),
+        .suspend        = serial_pnp_suspend,
+        .resume         = serial_pnp_resume,
+        .id_table       = pnp_dev_table,
+};
+
+static int __init serial8250_pnp_init(void)
+{
+        return pnp_register_driver(&serial_pnp_driver);
+}
+
+static void __exit serial8250_pnp_exit(void)
+{
+        pnp_unregister_driver(&serial_pnp_driver);
+}
+
+module_init(serial8250_pnp_init);
+module_exit(serial8250_pnp_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic 8250/16x50 PnP serial driver");
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
new file mode 100644
index 000000000000..636144cea932
--- /dev/null
+++ b/drivers/tty/serial/Kconfig
@@ -0,0 +1,1638 @@
+#
+# Serial device configuration
+#
+
+menu "Serial drivers"
+        depends on HAS_IOMEM
+
+#
+# The new 8250/16550 serial drivers
+config SERIAL_8250
+        tristate "8250/16550 and compatible serial support"
+        select SERIAL_CORE
+        ---help---
+          This selects whether you want to include the driver for the standard
+          serial ports.  The standard answer is Y.  People who might say N
+          here are those that are setting up dedicated Ethernet WWW/FTP
+          servers, or users that have one of the various bus mice instead of a
+          serial mouse and don't intend to use their machine's standard serial
+          port for anything.  (Note that the Cyclades and Stallion multi
+          serial port drivers do not need this driver built in for them to
+          work.)
+
+          To compile this driver as a module, choose M here: the
+          module will be called 8250.
+          [WARNING: Do not compile this driver as a module if you are using
+          non-standard serial ports, since the configuration information will
+          be lost when the driver is unloaded.  This limitation may be lifted
+          in the future.]
+
+          BTW1: If you have a mouseman serial mouse which is not recognized by
+          the X window system, try running gpm first.
+
+          BTW2: If you intend to use a software modem (also called Winmodem)
+          under Linux, forget it.  These modems are crippled and require
+          proprietary drivers which are only available under Windows.
+
+          Most people will say Y or M here, so that they can use serial mice,
+          modems and similar devices connecting to the standard serial ports.
+
+config SERIAL_8250_CONSOLE
+        bool "Console on 8250/16550 and compatible serial port"
+        depends on SERIAL_8250=y
+        select SERIAL_CORE_CONSOLE
+        ---help---
+          If you say Y here, it will be possible to use a serial port as the
+          system console (the system console is the device which receives all
+          kernel messages and warnings and which allows logins in single user
+          mode). This could be useful if some terminal or printer is connected
+          to that serial port.
+
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttyS1". (Try "man bootparam" or see the documentation of
+          your boot loader (grub or lilo or loadlin) about how to pass options
+          to the kernel at boot time.)
+
+          If you don't have a VGA card installed and you say Y here, the
+          kernel will automatically use the first serial line, /dev/ttyS0, as
+          system console.
+
+          You can set that using a kernel command line option such as
+          "console=uart8250,io,0x3f8,9600n8"
+          "console=uart8250,mmio,0xff5e0000,115200n8".
+          and it will switch to normal serial console when the corresponding 
+          port is ready.
+          "earlycon=uart8250,io,0x3f8,9600n8"
+          "earlycon=uart8250,mmio,0xff5e0000,115200n8".
+          it will not only setup early console.
+
+          If unsure, say N.
+
+config FIX_EARLYCON_MEM
+        bool
+        depends on X86
+        default y
+
+config SERIAL_8250_GSC
+        tristate
+        depends on SERIAL_8250 && GSC
+        default SERIAL_8250
+
+config SERIAL_8250_PCI
+        tristate "8250/16550 PCI device support" if EXPERT
+        depends on SERIAL_8250 && PCI
+        default SERIAL_8250
+        help
+          This builds standard PCI serial support. You may be able to
+          disable this feature if you only need legacy serial support.
+          Saves about 9K.
+
+config SERIAL_8250_PNP
+        tristate "8250/16550 PNP device support" if EXPERT
+        depends on SERIAL_8250 && PNP
+        default SERIAL_8250
+        help
+          This builds standard PNP serial support. You may be able to
+          disable this feature if you only need legacy serial support.
+
+config SERIAL_8250_HP300
+        tristate
+        depends on SERIAL_8250 && HP300
+        default SERIAL_8250
+
+config SERIAL_8250_CS
+        tristate "8250/16550 PCMCIA device support"
+        depends on PCMCIA && SERIAL_8250
+        ---help---
+          Say Y here to enable support for 16-bit PCMCIA serial devices,
+          including serial port cards, modems, and the modem functions of
+          multi-function Ethernet/modem cards. (PCMCIA- or PC-cards are
+          credit-card size devices often used with laptops.)
+
+          To compile this driver as a module, choose M here: the
+          module will be called serial_cs.
+
+          If unsure, say N.
+
+config SERIAL_8250_NR_UARTS
+        int "Maximum number of 8250/16550 serial ports"
+        depends on SERIAL_8250
+        default "4"
+        help
+          Set this to the number of serial ports you want the driver
+          to support.  This includes any ports discovered via ACPI or
+          PCI enumeration and any ports that may be added at run-time
+          via hot-plug, or any ISA multi-port serial cards.
+
+config SERIAL_8250_RUNTIME_UARTS
+        int "Number of 8250/16550 serial ports to register at runtime"
+        depends on SERIAL_8250
+        range 0 SERIAL_8250_NR_UARTS
+        default "4"
+        help
+          Set this to the maximum number of serial ports you want
+          the kernel to register at boot time.  This can be overridden
+          with the module parameter "nr_uarts", or boot-time parameter
+          8250.nr_uarts
+
+config SERIAL_8250_EXTENDED
+        bool "Extended 8250/16550 serial driver options"
+        depends on SERIAL_8250
+        help
+          If you wish to use any non-standard features of the standard "dumb"
+          driver, say Y here. This includes HUB6 support, shared serial
+          interrupts, special multiport support, support for more than the
+          four COM 1/2/3/4 boards, etc.
+
+          Note that the answer to this question won't directly affect the
+          kernel: saying N will just cause the configurator to skip all
+          the questions about serial driver options. If unsure, say N.
+
+config SERIAL_8250_MANY_PORTS
+        bool "Support more than 4 legacy serial ports"
+        depends on SERIAL_8250_EXTENDED && !IA64
+        help
+          Say Y here if you have dumb serial boards other than the four
+          standard COM 1/2/3/4 ports. This may happen if you have an AST
+          FourPort, Accent Async, Boca (read the Boca mini-HOWTO, available
+          from <http://www.tldp.org/docs.html#howto>), or other custom
+          serial port hardware which acts similar to standard serial port
+          hardware. If you only use the standard COM 1/2/3/4 ports, you can
+          say N here to save some memory. You can also say Y if you have an
+          "intelligent" multiport card such as Cyclades, Digiboards, etc.
+
+#
+# Multi-port serial cards
+#
+
+config SERIAL_8250_FOURPORT
+        tristate "Support Fourport cards"
+        depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+        help
+          Say Y here if you have an AST FourPort serial board.
+
+          To compile this driver as a module, choose M here: the module
+          will be called 8250_fourport.
+
+config SERIAL_8250_ACCENT
+        tristate "Support Accent cards"
+        depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+        help
+          Say Y here if you have an Accent Async serial board.
+
+          To compile this driver as a module, choose M here: the module
+          will be called 8250_accent.
+
+config SERIAL_8250_BOCA
+        tristate "Support Boca cards"
+        depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+        help
+          Say Y here if you have a Boca serial board.  Please read the Boca
+          mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>
+
+          To compile this driver as a module, choose M here: the module
+          will be called 8250_boca.
+
+config SERIAL_8250_EXAR_ST16C554
+        tristate "Support Exar ST16C554/554D Quad UART"
+        depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+        help
+          The Uplogix Envoy TU301 uses this Exar Quad UART.  If you are
+          tinkering with your Envoy TU301, or have a machine with this UART,
+          say Y here.
+
+          To compile this driver as a module, choose M here: the module
+          will be called 8250_exar_st16c554.
+
+config SERIAL_8250_HUB6
+        tristate "Support Hub6 cards"
+        depends on SERIAL_8250 != n && ISA && SERIAL_8250_MANY_PORTS
+        help
+          Say Y here if you have a HUB6 serial board.
+
+          To compile this driver as a module, choose M here: the module
+          will be called 8250_hub6.
+
+config SERIAL_8250_SHARE_IRQ
+        bool "Support for sharing serial interrupts"
+        depends on SERIAL_8250_EXTENDED
+        help
+          Some serial boards have hardware support which allows multiple dumb
+          serial ports on the same board to share a single IRQ. To enable
+          support for this in the serial driver, say Y here.
+
+config SERIAL_8250_DETECT_IRQ
+        bool "Autodetect IRQ on standard ports (unsafe)"
+        depends on SERIAL_8250_EXTENDED
+        help
+          Say Y here if you want the kernel to try to guess which IRQ
+          to use for your serial port.
+
+          This is considered unsafe; it is far better to configure the IRQ in
+          a boot script using the setserial command.
+
+          If unsure, say N.
+
+config SERIAL_8250_RSA
+        bool "Support RSA serial ports"
+        depends on SERIAL_8250_EXTENDED
+        help
+          ::: To be written :::
+
+config SERIAL_8250_MCA
+        tristate "Support 8250-type ports on MCA buses"
+        depends on SERIAL_8250 != n && MCA
+        help
+          Say Y here if you have a MCA serial ports.
+
+          To compile this driver as a module, choose M here: the module
+          will be called 8250_mca.
+
+config SERIAL_8250_ACORN
+        tristate "Acorn expansion card serial port support"
+        depends on ARCH_ACORN && SERIAL_8250
+        help
+          If you have an Atomwide Serial card or Serial Port card for an Acorn
+          system, say Y to this option.  The driver can handle 1, 2, or 3 port
+          cards.  If unsure, say N.
+
+config SERIAL_8250_RM9K
+        bool "Support for MIPS RM9xxx integrated serial port"
+        depends on SERIAL_8250 != n && SERIAL_RM9000
+        select SERIAL_8250_SHARE_IRQ
+        help
+          Selecting this option will add support for the integrated serial
+          port hardware found on MIPS RM9122 and similar processors.
+          If unsure, say N.
+
+comment "Non-8250 serial port support"
+
+config SERIAL_AMBA_PL010
+        tristate "ARM AMBA PL010 serial port support"
+        depends on ARM_AMBA && (BROKEN || !ARCH_VERSATILE)
+        select SERIAL_CORE
+        help
+          This selects the ARM(R) AMBA(R) PrimeCell PL010 UART.  If you have
+          an Integrator/AP or Integrator/PP2 platform, or if you have a
+          Cirrus Logic EP93xx CPU, say Y or M here.
+
+          If unsure, say N.
+
+config SERIAL_AMBA_PL010_CONSOLE
+        bool "Support for console on AMBA serial port"
+        depends on SERIAL_AMBA_PL010=y
+        select SERIAL_CORE_CONSOLE
+        ---help---
+          Say Y here if you wish to use an AMBA PrimeCell UART as the system
+          console (the system console is the device which receives all kernel
+          messages and warnings and which allows logins in single user mode).
+
+          Even if you say Y here, the currently visible framebuffer console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttyAM0". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_AMBA_PL011
+        tristate "ARM AMBA PL011 serial port support"
+        depends on ARM_AMBA
+        select SERIAL_CORE
+        help
+          This selects the ARM(R) AMBA(R) PrimeCell PL011 UART.  If you have
+          an Integrator/PP2, Integrator/CP or Versatile platform, say Y or M
+          here.
+
+          If unsure, say N.
+
+config SERIAL_AMBA_PL011_CONSOLE
+        bool "Support for console on AMBA serial port"
+        depends on SERIAL_AMBA_PL011=y
+        select SERIAL_CORE_CONSOLE
+        ---help---
+          Say Y here if you wish to use an AMBA PrimeCell UART as the system
+          console (the system console is the device which receives all kernel
+          messages and warnings and which allows logins in single user mode).
+
+          Even if you say Y here, the currently visible framebuffer console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttyAMA0". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_SB1250_DUART
+        tristate "BCM1xxx on-chip DUART serial support"
+        depends on SIBYTE_SB1xxx_SOC=y
+        select SERIAL_CORE
+        default y
+        ---help---
+          Support for the asynchronous serial interface (DUART) included in
+          the BCM1250 and derived System-On-a-Chip (SOC) devices.  Note that
+          the letter D in DUART stands for "dual", which is how the device
+          is implemented.  Depending on the SOC configuration there may be
+          one or more DUARTs available of which all are handled.
+
+          If unsure, say Y.  To compile this driver as a module, choose M here:
+          the module will be called sb1250-duart.
+
+config SERIAL_SB1250_DUART_CONSOLE
+        bool "Support for console on a BCM1xxx DUART serial port"
+        depends on SERIAL_SB1250_DUART=y
+        select SERIAL_CORE_CONSOLE
+        default y
+        ---help---
+          If you say Y here, it will be possible to use a serial port as the
+          system console (the system console is the device which receives all
+          kernel messages and warnings and which allows logins in single user
+          mode).
+
+          If unsure, say Y.
+
+config SERIAL_ATMEL
+        bool "AT91 / AT32 on-chip serial port support"
+        depends on (ARM && ARCH_AT91) || AVR32
+        select SERIAL_CORE
+        help
+          This enables the driver for the on-chip UARTs of the Atmel
+          AT91 and AT32 processors.
+
+config SERIAL_ATMEL_CONSOLE
+        bool "Support for console on AT91 / AT32 serial port"
+        depends on SERIAL_ATMEL=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Say Y here if you wish to use an on-chip UART on a Atmel
+          AT91 or AT32 processor as the system console (the system
+          console is the device which receives all kernel messages and
+          warnings and which allows logins in single user mode).
+
+config SERIAL_ATMEL_PDC
+        bool "Support DMA transfers on AT91 / AT32 serial port"
+        depends on SERIAL_ATMEL
+        default y
+        help
+          Say Y here if you wish to use the PDC to do DMA transfers to
+          and from the Atmel AT91 / AT32 serial port. In order to
+          actually use DMA transfers, make sure that the use_dma_tx
+          and use_dma_rx members in the atmel_uart_data struct is set
+          appropriately for each port.
+
+          Note that break and error handling currently doesn't work
+          properly when DMA is enabled. Make sure that ports where
+          this matters don't use DMA.
+
+config SERIAL_ATMEL_TTYAT
+        bool "Install as device ttyATn instead of ttySn"
+        depends on SERIAL_ATMEL=y
+        help
+          Say Y here if you wish to have the internal AT91 / AT32 UARTs
+          appear as /dev/ttyATn (major 204, minor starting at 154)
+          instead of the normal /dev/ttySn (major 4, minor starting at
+          64). This is necessary if you also want other UARTs, such as
+          external 8250/16C550 compatible UARTs.
+          The ttySn nodes are legally reserved for the 8250 serial driver
+          but are often misused by other serial drivers.
+
+          To use this, you should create suitable ttyATn device nodes in
+          /dev/, and pass "console=ttyATn" to the kernel.
+
+          Say Y if you have an external 8250/16C550 UART.  If unsure, say N.
+
+config SERIAL_KS8695
+        bool "Micrel KS8695 (Centaur) serial port support"
+        depends on ARCH_KS8695
+        select SERIAL_CORE
+        help
+          This selects the Micrel Centaur KS8695 UART.  Say Y here.
+
+config SERIAL_KS8695_CONSOLE
+        bool "Support for console on KS8695 (Centaur) serial port"
+        depends on SERIAL_KS8695=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Say Y here if you wish to use a KS8695 (Centaur) UART as the
+          system console (the system console is the device which
+          receives all kernel messages and warnings and which allows
+          logins in single user mode).
+
+config SERIAL_CLPS711X
+        tristate "CLPS711X serial port support"
+        depends on ARM && ARCH_CLPS711X
+        select SERIAL_CORE
+        help
+          ::: To be written :::
+
+config SERIAL_CLPS711X_CONSOLE
+        bool "Support for console on CLPS711X serial port"
+        depends on SERIAL_CLPS711X=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttyCL1". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_SAMSUNG
+        tristate "Samsung SoC serial support"
+        depends on ARM && PLAT_SAMSUNG
+        select SERIAL_CORE
+        help
+          Support for the on-chip UARTs on the Samsung S3C24XX series CPUs,
+          providing /dev/ttySAC0, 1 and 2 (note, some machines may not
+          provide all of these ports, depending on how the serial port
+          pins are configured.
+
+config SERIAL_SAMSUNG_UARTS_4
+        bool
+        depends on ARM && PLAT_SAMSUNG
+        default y if CPU_S3C2443
+        help
+          Internal node for the common case of 4 Samsung compatible UARTs
+
+config SERIAL_SAMSUNG_UARTS
+        int
+        depends on ARM && PLAT_SAMSUNG
+        default 2 if ARCH_S3C2400
+        default 6 if ARCH_S5P6450
+        default 4 if SERIAL_SAMSUNG_UARTS_4
+        default 3
+        help
+          Select the number of available UART ports for the Samsung S3C
+          serial driver
+        
+config SERIAL_SAMSUNG_DEBUG
+        bool "Samsung SoC serial debug"
+        depends on SERIAL_SAMSUNG && DEBUG_LL
+        help
+          Add support for debugging the serial driver. Since this is
+          generally being used as a console, we use our own output
+          routines that go via the low-level debug printascii()
+          function.
+
+config SERIAL_SAMSUNG_CONSOLE
+        bool "Support for console on Samsung SoC serial port"
+        depends on SERIAL_SAMSUNG=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Allow selection of the S3C24XX on-board serial ports for use as
+          an virtual console.
+
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttySACx". (Try "man bootparam" or see the documentation of
+          your boot loader about how to pass options to the kernel at
+          boot time.)
+
+config SERIAL_S3C2400
+        tristate "Samsung S3C2410 Serial port support"
+        depends on ARM && SERIAL_SAMSUNG && CPU_S3C2400
+        default y if CPU_S3C2400
+        help
+          Serial port support for the Samsung S3C2400 SoC
+
+config SERIAL_S3C2410
+        tristate "Samsung S3C2410 Serial port support"
+        depends on SERIAL_SAMSUNG && CPU_S3C2410
+        default y if CPU_S3C2410
+        help
+          Serial port support for the Samsung S3C2410 SoC
+
+config SERIAL_S3C2412
+        tristate "Samsung S3C2412/S3C2413 Serial port support"
+        depends on SERIAL_SAMSUNG && CPU_S3C2412
+        default y if CPU_S3C2412
+        help
+          Serial port support for the Samsung S3C2412 and S3C2413 SoC
+
+config SERIAL_S3C2440
+        tristate "Samsung S3C2440/S3C2442/S3C2416 Serial port support"
+        depends on SERIAL_SAMSUNG && (CPU_S3C2440 || CPU_S3C2442 || CPU_S3C2416)
+        default y if CPU_S3C2440
+        default y if CPU_S3C2442
+        select SERIAL_SAMSUNG_UARTS_4 if CPU_S3C2416
+        help
+          Serial port support for the Samsung S3C2440, S3C2416 and S3C2442 SoC
+
+config SERIAL_S3C24A0
+        tristate "Samsung S3C24A0 Serial port support"
+        depends on SERIAL_SAMSUNG && CPU_S3C24A0
+        default y if CPU_S3C24A0
+        help
+          Serial port support for the Samsung S3C24A0 SoC
+
+config SERIAL_S3C6400
+        tristate "Samsung S3C6400/S3C6410/S5P6440/S5P6450/S5PC100 Serial port support"
+        depends on SERIAL_SAMSUNG && (CPU_S3C6400 || CPU_S3C6410 || CPU_S5P6440 || CPU_S5P6450 || CPU_S5PC100)
+        select SERIAL_SAMSUNG_UARTS_4
+        default y
+        help
+          Serial port support for the Samsung S3C6400, S3C6410, S5P6440, S5P6450
+          and S5PC100 SoCs
+
+config SERIAL_S5PV210
+        tristate "Samsung S5PV210 Serial port support"
+        depends on SERIAL_SAMSUNG && (CPU_S5PV210 || CPU_EXYNOS4210)
+        select SERIAL_SAMSUNG_UARTS_4 if (CPU_S5PV210 || CPU_EXYNOS4210)
+        default y
+        help
+          Serial port support for Samsung's S5P Family of SoC's
+
+
+config SERIAL_MAX3100
+        tristate "MAX3100 support"
+        depends on SPI
+        select SERIAL_CORE
+        help
+          MAX3100 chip support
+
+config SERIAL_MAX3107
+        tristate "MAX3107 support"
+        depends on SPI
+        select SERIAL_CORE
+        help
+          MAX3107 chip support
+
+config SERIAL_MAX3107_AAVA
+        tristate "MAX3107 AAVA platform support"
+        depends on X86_MRST && SERIAL_MAX3107 && GPIOLIB
+        select SERIAL_CORE
+        help
+          Support for the MAX3107 chip configuration found on the AAVA
+          platform. Includes the extra initialisation and GPIO support
+          neded for this device.
+
+config SERIAL_DZ
+        bool "DECstation DZ serial driver"
+        depends on MACH_DECSTATION && 32BIT
+        select SERIAL_CORE
+        default y
+        ---help---
+          DZ11-family serial controllers for DECstations and VAXstations,
+          including the DC7085, M7814, and M7819.
+
+config SERIAL_DZ_CONSOLE
+        bool "Support console on DECstation DZ serial driver"
+        depends on SERIAL_DZ=y
+        select SERIAL_CORE_CONSOLE
+        default y
+        ---help---
+          If you say Y here, it will be possible to use a serial port as the
+          system console (the system console is the device which receives all
+          kernel messages and warnings and which allows logins in single user
+          mode).
+
+          Note that the firmware uses ttyS3 as the serial console on
+          DECstations that use this driver.
+
+          If unsure, say Y.
+
+config SERIAL_ZS
+        tristate "DECstation Z85C30 serial support"
+        depends on MACH_DECSTATION
+        select SERIAL_CORE
+        default y
+        ---help---
+          Support for the Zilog 85C350 serial communications controller used
+          for serial ports in newer DECstation systems.  These include the
+          DECsystem 5900 and all models of the DECstation and DECsystem 5000
+          systems except from model 200.
+
+          If unsure, say Y.  To compile this driver as a module, choose M here:
+          the module will be called zs.
+
+config SERIAL_ZS_CONSOLE
+        bool "Support for console on a DECstation Z85C30 serial port"
+        depends on SERIAL_ZS=y
+        select SERIAL_CORE_CONSOLE
+        default y
+        ---help---
+          If you say Y here, it will be possible to use a serial port as the
+          system console (the system console is the device which receives all
+          kernel messages and warnings and which allows logins in single user
+          mode).
+
+          Note that the firmware uses ttyS1 as the serial console on the
+          Maxine and ttyS3 on the others using this driver.
+
+          If unsure, say Y.
+
+config SERIAL_21285
+        tristate "DC21285 serial port support"
+        depends on ARM && FOOTBRIDGE
+        select SERIAL_CORE
+        help
+          If you have a machine based on a 21285 (Footbridge) StrongARM(R)/
+          PCI bridge you can enable its onboard serial port by enabling this
+          option.
+
+config SERIAL_21285_CONSOLE
+        bool "Console on DC21285 serial port"
+        depends on SERIAL_21285=y
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have enabled the serial port on the 21285 footbridge you can
+          make it the console by answering Y to this option.
+
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttyFB". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_MPSC
+        bool "Marvell MPSC serial port support"
+        depends on PPC32 && MV64X60
+        select SERIAL_CORE
+        help
+          Say Y here if you want to use the Marvell MPSC serial controller.
+
+config SERIAL_MPSC_CONSOLE
+        bool "Support for console on Marvell MPSC serial port"
+        depends on SERIAL_MPSC
+        select SERIAL_CORE_CONSOLE
+        help
+          Say Y here if you want to support a serial console on a Marvell MPSC.
+
+config SERIAL_PXA
+        bool "PXA serial port support"
+        depends on ARCH_PXA || ARCH_MMP
+        select SERIAL_CORE
+        help
+          If you have a machine based on an Intel XScale PXA2xx CPU you
+          can enable its onboard serial ports by enabling this option.
+
+config SERIAL_PXA_CONSOLE
+        bool "Console on PXA serial port"
+        depends on SERIAL_PXA
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have enabled the serial port on the Intel XScale PXA
+          CPU you can make it the console by answering Y to this option.
+
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttySA0". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_SA1100
+        bool "SA1100 serial port support"
+        depends on ARM && ARCH_SA1100
+        select SERIAL_CORE
+        help
+          If you have a machine based on a SA1100/SA1110 StrongARM(R) CPU you
+          can enable its onboard serial port by enabling this option.
+          Please read <file:Documentation/arm/SA1100/serial_UART> for further
+          info.
+
+config SERIAL_SA1100_CONSOLE
+        bool "Console on SA1100 serial port"
+        depends on SERIAL_SA1100
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have enabled the serial port on the SA1100/SA1110 StrongARM
+          CPU you can make it the console by answering Y to this option.
+
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttySA0". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_MRST_MAX3110
+        tristate "SPI UART driver for Max3110"
+        depends on SPI_DW_PCI
+        select SERIAL_CORE
+        select SERIAL_CORE_CONSOLE
+        help
+          This is the UART protocol driver for the MAX3110 device on
+          the Intel Moorestown platform. On other systems use the max3100
+          driver.
+
+config SERIAL_MFD_HSU
+        tristate "Medfield High Speed UART support"
+        depends on PCI
+        select SERIAL_CORE
+
+config SERIAL_MFD_HSU_CONSOLE
+        boolean "Medfile HSU serial console support"
+        depends on SERIAL_MFD_HSU=y
+        select SERIAL_CORE_CONSOLE
+
+config SERIAL_BFIN
+        tristate "Blackfin serial port support"
+        depends on BLACKFIN
+        select SERIAL_CORE
+        select SERIAL_BFIN_UART0 if (BF531 || BF532 || BF533 || BF561)
+        help
+          Add support for the built-in UARTs on the Blackfin.
+
+          To compile this driver as a module, choose M here: the
+          module will be called bfin_5xx.
+
+config SERIAL_BFIN_CONSOLE
+        bool "Console on Blackfin serial port"
+        depends on SERIAL_BFIN=y
+        select SERIAL_CORE_CONSOLE
+
+choice
+        prompt "UART Mode"
+        depends on SERIAL_BFIN
+        default SERIAL_BFIN_DMA
+        help
+          This driver supports the built-in serial ports of the Blackfin family
+          of CPUs
+
+config SERIAL_BFIN_DMA
+        bool "DMA mode"
+        depends on !DMA_UNCACHED_NONE && KGDB_SERIAL_CONSOLE=n
+        help
+          This driver works under DMA mode. If this option is selected, the
+          blackfin simple dma driver is also enabled.
+
+config SERIAL_BFIN_PIO
+        bool "PIO mode"
+        help
+          This driver works under PIO mode.
+
+endchoice
+
+config SERIAL_BFIN_UART0
+        bool "Enable UART0"
+        depends on SERIAL_BFIN
+        help
+          Enable UART0
+
+config BFIN_UART0_CTSRTS
+        bool "Enable UART0 hardware flow control"
+        depends on SERIAL_BFIN_UART0
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_BFIN_UART1
+        bool "Enable UART1"
+        depends on SERIAL_BFIN && (!BF531 && !BF532 && !BF533 && !BF561)
+        help
+          Enable UART1
+
+config BFIN_UART1_CTSRTS
+        bool "Enable UART1 hardware flow control"
+        depends on SERIAL_BFIN_UART1
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_BFIN_UART2
+        bool "Enable UART2"
+        depends on SERIAL_BFIN && (BF54x || BF538 || BF539)
+        help
+          Enable UART2
+
+config BFIN_UART2_CTSRTS
+        bool "Enable UART2 hardware flow control"
+        depends on SERIAL_BFIN_UART2
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_BFIN_UART3
+        bool "Enable UART3"
+        depends on SERIAL_BFIN && (BF54x)
+        help
+          Enable UART3
+
+config BFIN_UART3_CTSRTS
+        bool "Enable UART3 hardware flow control"
+        depends on SERIAL_BFIN_UART3
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_IMX
+        bool "IMX serial port support"
+        depends on ARM && (ARCH_IMX || ARCH_MXC)
+        select SERIAL_CORE
+        select RATIONAL
+        help
+          If you have a machine based on a Motorola IMX CPU you
+          can enable its onboard serial port by enabling this option.
+
+config SERIAL_IMX_CONSOLE
+        bool "Console on IMX serial port"
+        depends on SERIAL_IMX
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have enabled the serial port on the Motorola IMX
+          CPU you can make it the console by answering Y to this option.
+
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttySA0". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_UARTLITE
+        tristate "Xilinx uartlite serial port support"
+        depends on PPC32 || MICROBLAZE || MFD_TIMBERDALE
+        select SERIAL_CORE
+        help
+          Say Y here if you want to use the Xilinx uartlite serial controller.
+
+          To compile this driver as a module, choose M here: the
+          module will be called uartlite.
+
+config SERIAL_UARTLITE_CONSOLE
+        bool "Support for console on Xilinx uartlite serial port"
+        depends on SERIAL_UARTLITE=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Say Y here if you wish to use a Xilinx uartlite as the system
+          console (the system console is the device which receives all kernel
+          messages and warnings and which allows logins in single user mode).
+
+config SERIAL_SUNCORE
+        bool
+        depends on SPARC
+        select SERIAL_CORE
+        select SERIAL_CORE_CONSOLE
+        default y
+
+config SERIAL_SUNZILOG
+        tristate "Sun Zilog8530 serial support"
+        depends on SPARC
+        help
+          This driver supports the Zilog8530 serial ports found on many Sparc
+          systems.  Say Y or M if you want to be able to these serial ports.
+
+config SERIAL_SUNZILOG_CONSOLE
+        bool "Console on Sun Zilog8530 serial port"
+        depends on SERIAL_SUNZILOG=y
+        help
+          If you would like to be able to use the Zilog8530 serial port
+          on your Sparc system as the console, you can do so by answering
+          Y to this option.
+
+config SERIAL_SUNSU
+        tristate "Sun SU serial support"
+        depends on SPARC && PCI
+        help
+          This driver supports the 8250 serial ports that run the keyboard and
+          mouse on (PCI) UltraSPARC systems.  Say Y or M if you want to be able
+          to these serial ports.
+
+config SERIAL_SUNSU_CONSOLE
+        bool "Console on Sun SU serial port"
+        depends on SERIAL_SUNSU=y
+        help
+          If you would like to be able to use the SU serial port
+          on your Sparc system as the console, you can do so by answering
+          Y to this option.
+
+config SERIAL_MUX
+        tristate "Serial MUX support"
+        depends on GSC
+        select SERIAL_CORE
+        default y
+        ---help---
+          Saying Y here will enable the hardware MUX serial driver for
+          the Nova, K class systems and D class with a 'remote control card'.
+          The hardware MUX is not 8250/16550 compatible therefore the
+          /dev/ttyB0 device is shared between the Serial MUX and the PDC
+          software console. The following steps need to be completed to use
+          the Serial MUX:
+
+            1. create the device entry (mknod /dev/ttyB0 c 11 0)
+            2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0
+            3. Add device ttyB0 to /etc/securetty (if you want to log on as
+                 root on this console.)
+            4. Change the kernel command console parameter to: console=ttyB0
+
+config SERIAL_MUX_CONSOLE
+        bool "Support for console on serial MUX"
+        depends on SERIAL_MUX=y
+        select SERIAL_CORE_CONSOLE
+        default y
+
+config PDC_CONSOLE
+        bool "PDC software console support"
+        depends on PARISC && !SERIAL_MUX && VT
+        default n
+        help
+          Saying Y here will enable the software based PDC console to be 
+          used as the system console.  This is useful for machines in 
+          which the hardware based console has not been written yet.  The
+          following steps must be competed to use the PDC console:
+
+            1. create the device entry (mknod /dev/ttyB0 c 11 0)
+            2. Edit the /etc/inittab to start a getty listening on /dev/ttyB0
+            3. Add device ttyB0 to /etc/securetty (if you want to log on as
+                 root on this console.)
+            4. Change the kernel command console parameter to: console=ttyB0
+
+config SERIAL_SUNSAB
+        tristate "Sun Siemens SAB82532 serial support"
+        depends on SPARC && PCI
+        help
+          This driver supports the Siemens SAB82532 DUSCC serial ports on newer
+          (PCI) UltraSPARC systems.  Say Y or M if you want to be able to these
+          serial ports.
+
+config SERIAL_SUNSAB_CONSOLE
+        bool "Console on Sun Siemens SAB82532 serial port"
+        depends on SERIAL_SUNSAB=y
+        help
+          If you would like to be able to use the SAB82532 serial port
+          on your Sparc system as the console, you can do so by answering
+          Y to this option.
+
+config SERIAL_SUNHV
+        bool "Sun4v Hypervisor Console support"
+        depends on SPARC64
+        help
+          This driver supports the console device found on SUN4V Sparc
+          systems.  Say Y if you want to be able to use this device.
+
+config SERIAL_IP22_ZILOG
+        tristate "SGI Zilog8530 serial support"
+        depends on SGI_HAS_ZILOG
+        select SERIAL_CORE
+        help
+          This driver supports the Zilog8530 serial ports found on SGI
+          systems.  Say Y or M if you want to be able to these serial ports.
+
+config SERIAL_IP22_ZILOG_CONSOLE
+        bool "Console on SGI Zilog8530 serial port"
+        depends on SERIAL_IP22_ZILOG=y
+        select SERIAL_CORE_CONSOLE
+
+config SERIAL_SH_SCI
+        tristate "SuperH SCI(F) serial port support"
+        depends on HAVE_CLK && (SUPERH || H8300 || ARCH_SHMOBILE)
+        select SERIAL_CORE
+
+config SERIAL_SH_SCI_NR_UARTS
+        int "Maximum number of SCI(F) serial ports"
+        depends on SERIAL_SH_SCI
+        default "2"
+
+config SERIAL_SH_SCI_CONSOLE
+        bool "Support for console on SuperH SCI(F)"
+        depends on SERIAL_SH_SCI=y
+        select SERIAL_CORE_CONSOLE
+
+config SERIAL_SH_SCI_DMA
+        bool "DMA support"
+        depends on SERIAL_SH_SCI && SH_DMAE && EXPERIMENTAL
+
+config SERIAL_PNX8XXX
+        bool "Enable PNX8XXX SoCs' UART Support"
+        depends on MIPS && (SOC_PNX8550 || SOC_PNX833X)
+        select SERIAL_CORE
+        help
+          If you have a MIPS-based Philips SoC such as PNX8550 or PNX8330
+          and you want to use serial ports, say Y.  Otherwise, say N.
+
+config SERIAL_PNX8XXX_CONSOLE
+        bool "Enable PNX8XX0 serial console"
+        depends on SERIAL_PNX8XXX
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have a MIPS-based Philips SoC such as PNX8550 or PNX8330
+          and you want to use serial console, say Y. Otherwise, say N.
+
+config SERIAL_CORE
+        tristate
+
+config SERIAL_CORE_CONSOLE
+        bool
+
+config CONSOLE_POLL
+        bool
+
+config SERIAL_68328
+        bool "68328 serial support"
+        depends on M68328 || M68EZ328 || M68VZ328
+        help
+          This driver supports the built-in serial port of the Motorola 68328
+          (standard, EZ and VZ varieties).
+
+config SERIAL_68328_RTS_CTS
+        bool "Support RTS/CTS on 68328 serial port"
+        depends on SERIAL_68328
+
+config SERIAL_MCF
+        bool "Coldfire serial support"
+        depends on COLDFIRE
+        select SERIAL_CORE
+        help
+          This serial driver supports the Freescale Coldfire serial ports.
+
+config SERIAL_MCF_BAUDRATE
+        int "Default baudrate for Coldfire serial ports"
+        depends on SERIAL_MCF
+        default 19200
+        help
+          This setting lets you define what the default baudrate is for the
+          ColdFire serial ports. The usual default varies from board to board,
+          and this setting is a way of catering for that.
+
+config SERIAL_MCF_CONSOLE
+        bool "Coldfire serial console support"
+        depends on SERIAL_MCF
+        select SERIAL_CORE_CONSOLE
+        help
+          Enable a ColdFire internal serial port to be the system console.
+
+config SERIAL_68360_SMC
+        bool "68360 SMC uart support"
+        depends on M68360
+        help
+          This driver supports the SMC serial ports of the Motorola 68360 CPU.
+
+config SERIAL_68360_SCC
+        bool "68360 SCC uart support"
+        depends on M68360
+        help
+          This driver supports the SCC serial ports of the Motorola 68360 CPU.
+
+config SERIAL_68360
+        bool
+        depends on SERIAL_68360_SMC || SERIAL_68360_SCC
+        default y
+
+config SERIAL_PMACZILOG
+        tristate "Mac or PowerMac z85c30 ESCC support"
+        depends on (M68K && MAC) || (PPC_OF && PPC_PMAC)
+        select SERIAL_CORE
+        help
+          This driver supports the Zilog z85C30 serial ports found on
+          (Power)Mac machines.
+          Say Y or M if you want to be able to these serial ports.
+
+config SERIAL_PMACZILOG_TTYS
+        bool "Use ttySn device nodes for Zilog z85c30"
+        depends on SERIAL_PMACZILOG
+        help
+          The pmac_zilog driver for the z85C30 chip on many powermacs
+          historically used the device numbers for /dev/ttySn.  The
+          8250 serial port driver also uses these numbers, which means
+          the two drivers being unable to coexist; you could not use
+          both z85C30 and 8250 type ports at the same time.
+
+          If this option is not selected, the pmac_zilog driver will
+          use the device numbers allocated for /dev/ttyPZn.  This allows
+          the pmac_zilog and 8250 drivers to co-exist, but may cause
+          existing userspace setups to break.  Programs that need to
+          access the built-in serial ports on powermacs will need to
+          be reconfigured to use /dev/ttyPZn instead of /dev/ttySn.
+
+          If you enable this option, any z85c30 ports in the system will
+          be registered as ttyS0 onwards as in the past, and you will be
+          unable to use the 8250 module for PCMCIA or other 16C550-style
+          UARTs.
+
+          Say N unless you need the z85c30 ports on your (Power)Mac
+          to appear as /dev/ttySn.
+
+config SERIAL_PMACZILOG_CONSOLE
+        bool "Console on Mac or PowerMac z85c30 serial port"
+        depends on SERIAL_PMACZILOG=y
+        select SERIAL_CORE_CONSOLE
+        help
+          If you would like to be able to use the z85c30 serial port
+          on your (Power)Mac as the console, you can do so by answering
+          Y to this option.
+
+config SERIAL_CPM
+        tristate "CPM SCC/SMC serial port support"
+        depends on CPM2 || 8xx
+        select SERIAL_CORE
+        help
+          This driver supports the SCC and SMC serial ports on Motorola 
+          embedded PowerPC that contain a CPM1 (8xx) or CPM2 (8xxx)
+
+config SERIAL_CPM_CONSOLE
+        bool "Support for console on CPM SCC/SMC serial port"
+        depends on SERIAL_CPM=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Say Y here if you wish to use a SCC or SMC CPM UART as the system
+          console (the system console is the device which receives all kernel
+          messages and warnings and which allows logins in single user mode).
+
+          Even if you say Y here, the currently visible framebuffer console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttyCPM0". (Try "man bootparam" or see the documentation of
+          your boot loader (lilo or loadlin) about how to pass options to the
+          kernel at boot time.)
+
+config SERIAL_SGI_L1_CONSOLE
+        bool "SGI Altix L1 serial console support"
+        depends on IA64_GENERIC || IA64_SGI_SN2
+        select SERIAL_CORE
+        select SERIAL_CORE_CONSOLE
+        help
+                If you have an SGI Altix and you would like to use the system
+                controller serial port as your console (you want this!),
+                say Y.  Otherwise, say N.
+
+config SERIAL_MPC52xx
+        tristate "Freescale MPC52xx/MPC512x family PSC serial support"
+        depends on PPC_MPC52xx || PPC_MPC512x
+        select SERIAL_CORE
+        help
+          This driver supports MPC52xx and MPC512x PSC serial ports. If you would
+          like to use them, you must answer Y or M to this option. Note that
+          for use as console, it must be included in kernel and not as a
+          module.
+
+config SERIAL_MPC52xx_CONSOLE
+        bool "Console on a Freescale MPC52xx/MPC512x family PSC serial port"
+        depends on SERIAL_MPC52xx=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Select this options if you'd like to use one of the PSC serial port
+          of the Freescale MPC52xx family as a console.
+
+config SERIAL_MPC52xx_CONSOLE_BAUD
+        int "Freescale MPC52xx/MPC512x family PSC serial port baud"
+        depends on SERIAL_MPC52xx_CONSOLE=y
+        default "9600"
+        help
+          Select the MPC52xx console baud rate.
+          This value is only used if the bootloader doesn't pass in the
+          console baudrate
+
+config SERIAL_ICOM
+        tristate "IBM Multiport Serial Adapter"
+        depends on PCI && (PPC_ISERIES || PPC_PSERIES)
+        select SERIAL_CORE
+        select FW_LOADER
+        help
+          This driver is for a family of multiport serial adapters
+          including 2 port RVX, 2 port internal modem, 4 port internal
+          modem and a split 1 port RVX and 1 port internal modem.
+
+          This driver can also be built as a module.  If so, the module
+          will be called icom.
+
+config SERIAL_M32R_SIO
+        bool "M32R SIO I/F"
+        depends on M32R
+        default y
+        select SERIAL_CORE
+        help
+          Say Y here if you want to use the M32R serial controller.
+
+config SERIAL_M32R_SIO_CONSOLE
+        bool "use SIO console"
+        depends on SERIAL_M32R_SIO=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Say Y here if you want to support a serial console.
+
+          If you use an M3T-M32700UT or an OPSPUT platform,
+          please say also y for SERIAL_M32R_PLDSIO.
+
+config SERIAL_M32R_PLDSIO
+        bool "M32R SIO I/F on a PLD"
+        depends on SERIAL_M32R_SIO=y && (PLAT_OPSPUT || PLAT_USRV || PLAT_M32700UT)
+        default n
+        help
+          Say Y here if you want to use the M32R serial controller
+          on a PLD (Programmable Logic Device).
+
+          If you use an M3T-M32700UT or an OPSPUT platform,
+          please say Y.
+
+config SERIAL_TXX9
+        bool "TMPTX39XX/49XX SIO support"
+        depends on HAS_TXX9_SERIAL
+        select SERIAL_CORE
+        default y
+
+config HAS_TXX9_SERIAL
+        bool
+
+config SERIAL_TXX9_NR_UARTS
+        int "Maximum number of TMPTX39XX/49XX SIO ports"
+        depends on SERIAL_TXX9
+        default "6"
+
+config SERIAL_TXX9_CONSOLE
+        bool "TMPTX39XX/49XX SIO Console support"
+        depends on SERIAL_TXX9=y
+        select SERIAL_CORE_CONSOLE
+
+config SERIAL_TXX9_STDSERIAL
+        bool "TX39XX/49XX SIO act as standard serial"
+        depends on !SERIAL_8250 && SERIAL_TXX9
+
+config SERIAL_VR41XX
+        tristate "NEC VR4100 series Serial Interface Unit support"
+        depends on CPU_VR41XX
+        select SERIAL_CORE
+        help
+          If you have a NEC VR4100 series processor and you want to use
+          Serial Interface Unit(SIU) or Debug Serial Interface Unit(DSIU)
+          (not include VR4111/VR4121 DSIU), say Y.  Otherwise, say N.
+
+config SERIAL_VR41XX_CONSOLE
+        bool "Enable NEC VR4100 series Serial Interface Unit console"
+        depends on SERIAL_VR41XX=y
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have a NEC VR4100 series processor and you want to use
+          a console on a serial port, say Y.  Otherwise, say N.
+
+config SERIAL_JSM
+        tristate "Digi International NEO PCI Support"
+        depends on PCI
+        select SERIAL_CORE
+        help
+          This is a driver for Digi International's Neo series
+          of cards which provide multiple serial ports. You would need
+          something like this to connect more than two modems to your Linux
+          box, for instance in order to become a dial-in server. This driver
+          supports PCI boards only.
+
+          If you have a card like this, say Y here, otherwise say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called jsm.
+
+config SERIAL_SGI_IOC4
+        tristate "SGI IOC4 controller serial support"
+        depends on (IA64_GENERIC || IA64_SGI_SN2) && SGI_IOC4
+        select SERIAL_CORE
+        help
+                If you have an SGI Altix with an IOC4 based Base IO card
+                and wish to use the serial ports on this card, say Y.
+                Otherwise, say N.
+
+config SERIAL_SGI_IOC3
+        tristate "SGI Altix IOC3 serial support"
+        depends on (IA64_GENERIC || IA64_SGI_SN2) && SGI_IOC3
+        select SERIAL_CORE
+        help
+          If you have an SGI Altix with an IOC3 serial card,
+          say Y or M.  Otherwise, say N.
+
+config SERIAL_MSM
+        bool "MSM on-chip serial port support"
+        depends on ARM && ARCH_MSM
+        select SERIAL_CORE
+
+config SERIAL_MSM_CONSOLE
+        bool "MSM serial console support"
+        depends on SERIAL_MSM=y
+        select SERIAL_CORE_CONSOLE
+
+config SERIAL_MSM_HS
+        tristate "MSM UART High Speed: Serial Driver"
+        depends on ARCH_MSM
+        select SERIAL_CORE
+        help
+          If you have a machine based on MSM family of SoCs, you
+          can enable its onboard high speed serial port by enabling
+          this option.
+
+          Choose M here to compile it as a module. The module will be
+          called msm_serial_hs.
+
+config SERIAL_VT8500
+        bool "VIA VT8500 on-chip serial port support"
+        depends on ARM && ARCH_VT8500
+        select SERIAL_CORE
+
+config SERIAL_VT8500_CONSOLE
+        bool "VIA VT8500 serial console support"
+        depends on SERIAL_VT8500=y
+        select SERIAL_CORE_CONSOLE
+
+config SERIAL_NETX
+        tristate "NetX serial port support"
+        depends on ARM && ARCH_NETX
+        select SERIAL_CORE
+        help
+          If you have a machine based on a Hilscher NetX SoC you
+          can enable its onboard serial port by enabling this option.
+
+          To compile this driver as a module, choose M here: the
+          module will be called netx-serial.
+
+config SERIAL_NETX_CONSOLE
+        bool "Console on NetX serial port"
+        depends on SERIAL_NETX=y
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have enabled the serial port on the Hilscher NetX SoC
+          you can make it the console by answering Y to this option.
+
+config SERIAL_OF_PLATFORM
+        tristate "Serial port on Open Firmware platform bus"
+        depends on OF
+        depends on SERIAL_8250 || SERIAL_OF_PLATFORM_NWPSERIAL
+        help
+          If you have a PowerPC based system that has serial ports
+          on a platform specific bus, you should enable this option.
+          Currently, only 8250 compatible ports are supported, but
+          others can easily be added.
+
+config SERIAL_OMAP
+        tristate "OMAP serial port support"
+        depends on ARCH_OMAP2 || ARCH_OMAP3 || ARCH_OMAP4
+        select SERIAL_CORE
+        help
+          If you have a machine based on an Texas Instruments OMAP CPU you
+          can enable its onboard serial ports by enabling this option.
+
+          By enabling this option you take advantage of dma feature available
+          with the omap-serial driver. DMA support can be enabled from platform
+          data.
+
+config SERIAL_OMAP_CONSOLE
+        bool "Console on OMAP serial port"
+        depends on SERIAL_OMAP
+        select SERIAL_CORE_CONSOLE
+        help
+          Select this option if you would like to use omap serial port as
+          console.
+
+          Even if you say Y here, the currently visible virtual console
+          (/dev/tty0) will still be used as the system console by default, but
+          you can alter that using a kernel command line option such as
+          "console=ttyOx". (Try "man bootparam" or see the documentation of
+          your boot loader about how to pass options to the kernel at
+          boot time.)
+
+config SERIAL_OF_PLATFORM_NWPSERIAL
+        tristate "NWP serial port driver"
+        depends on PPC_OF && PPC_DCR
+        select SERIAL_OF_PLATFORM
+        select SERIAL_CORE_CONSOLE
+        select SERIAL_CORE
+        help
+          This driver supports the cell network processor nwp serial
+          device.
+
+config SERIAL_OF_PLATFORM_NWPSERIAL_CONSOLE
+        bool "Console on NWP serial port"
+        depends on SERIAL_OF_PLATFORM_NWPSERIAL=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Support for Console on the NWP serial ports.
+
+config SERIAL_LANTIQ
+        bool "Lantiq serial driver"
+        depends on LANTIQ
+        select SERIAL_CORE
+        select SERIAL_CORE_CONSOLE
+        help
+          Support for console and UART on Lantiq SoCs.
+
+config SERIAL_QE
+        tristate "Freescale QUICC Engine serial port support"
+        depends on QUICC_ENGINE
+        select SERIAL_CORE
+        select FW_LOADER
+        default n
+        help
+          This driver supports the QE serial ports on Freescale embedded
+          PowerPC that contain a QUICC Engine.
+
+config SERIAL_SC26XX
+        tristate "SC2681/SC2692 serial port support"
+        depends on SNI_RM
+        select SERIAL_CORE
+        help
+          This is a driver for the onboard serial ports of
+          older RM400 machines.
+
+config SERIAL_SC26XX_CONSOLE
+        bool "Console on SC2681/SC2692 serial port"
+        depends on SERIAL_SC26XX
+        select SERIAL_CORE_CONSOLE
+        help
+          Support for Console on SC2681/SC2692 serial ports.
+
+config SERIAL_BFIN_SPORT
+        tristate "Blackfin SPORT emulate UART"
+        depends on BLACKFIN
+        select SERIAL_CORE
+        help
+          Enable SPORT emulate UART on Blackfin series.
+
+          To compile this driver as a module, choose M here: the
+          module will be called bfin_sport_uart.
+
+config SERIAL_BFIN_SPORT_CONSOLE
+        bool "Console on Blackfin sport emulated uart"
+        depends on SERIAL_BFIN_SPORT=y
+        select SERIAL_CORE_CONSOLE
+
+config SERIAL_BFIN_SPORT0_UART
+        bool "Enable UART over SPORT0"
+        depends on SERIAL_BFIN_SPORT && !(BF542 || BF544)
+        help
+          Enable UART over SPORT0
+
+config SERIAL_BFIN_SPORT0_UART_CTSRTS
+        bool "Enable UART over SPORT0 hardware flow control"
+        depends on SERIAL_BFIN_SPORT0_UART
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_BFIN_SPORT1_UART
+        bool "Enable UART over SPORT1"
+        depends on SERIAL_BFIN_SPORT
+        help
+          Enable UART over SPORT1
+
+config SERIAL_BFIN_SPORT1_UART_CTSRTS
+        bool "Enable UART over SPORT1 hardware flow control"
+        depends on SERIAL_BFIN_SPORT1_UART
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_BFIN_SPORT2_UART
+        bool "Enable UART over SPORT2"
+        depends on SERIAL_BFIN_SPORT && (BF54x || BF538 || BF539)
+        help
+          Enable UART over SPORT2
+
+config SERIAL_BFIN_SPORT2_UART_CTSRTS
+        bool "Enable UART over SPORT2 hardware flow control"
+        depends on SERIAL_BFIN_SPORT2_UART
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_BFIN_SPORT3_UART
+        bool "Enable UART over SPORT3"
+        depends on SERIAL_BFIN_SPORT && (BF54x || BF538 || BF539)
+        help
+          Enable UART over SPORT3
+
+config SERIAL_BFIN_SPORT3_UART_CTSRTS
+        bool "Enable UART over SPORT3 hardware flow control"
+        depends on SERIAL_BFIN_SPORT3_UART
+        help
+          Enable hardware flow control in the driver.
+
+config SERIAL_TIMBERDALE
+        tristate "Support for timberdale UART"
+        select SERIAL_CORE
+        ---help---
+        Add support for UART controller on timberdale.
+
+config SERIAL_BCM63XX
+        tristate "bcm63xx serial port support"
+        select SERIAL_CORE
+        depends on BCM63XX
+        help
+          If you have a bcm63xx CPU, you can enable its onboard
+          serial port by enabling this options.
+
+          To compile this driver as a module, choose M here: the
+          module will be called bcm963xx_uart.
+
+config SERIAL_BCM63XX_CONSOLE
+        bool "Console on bcm63xx serial port"
+        depends on SERIAL_BCM63XX=y
+        select SERIAL_CORE_CONSOLE
+        help
+          If you have enabled the serial port on the bcm63xx CPU
+          you can make it the console by answering Y to this option.
+
+config SERIAL_GRLIB_GAISLER_APBUART
+        tristate "GRLIB APBUART serial support"
+        depends on OF && SPARC
+        select SERIAL_CORE
+        ---help---
+        Add support for the GRLIB APBUART serial port.
+
+config SERIAL_GRLIB_GAISLER_APBUART_CONSOLE
+        bool "Console on GRLIB APBUART serial port"
+        depends on SERIAL_GRLIB_GAISLER_APBUART=y
+        select SERIAL_CORE_CONSOLE
+        help
+        Support for running a console on the GRLIB APBUART
+
+config SERIAL_ALTERA_JTAGUART
+        tristate "Altera JTAG UART support"
+        select SERIAL_CORE
+        help
+          This driver supports the Altera JTAG UART port.
+
+config SERIAL_ALTERA_JTAGUART_CONSOLE
+        bool "Altera JTAG UART console support"
+        depends on SERIAL_ALTERA_JTAGUART=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Enable a Altera JTAG UART port to be the system console.
+
+config SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS
+        bool "Bypass output when no connection"
+        depends on SERIAL_ALTERA_JTAGUART_CONSOLE
+        select SERIAL_CORE_CONSOLE
+        help
+          Bypass console output and keep going even if there is no
+          JTAG terminal connection with the host.
+
+config SERIAL_ALTERA_UART
+        tristate "Altera UART support"
+        select SERIAL_CORE
+        help
+          This driver supports the Altera softcore UART port.
+
+config SERIAL_ALTERA_UART_MAXPORTS
+        int "Maximum number of Altera UART ports"
+        depends on SERIAL_ALTERA_UART
+        default 4
+        help
+          This setting lets you define the maximum number of the Altera
+          UART ports. The usual default varies from board to board, and
+          this setting is a way of catering for that.
+
+config SERIAL_ALTERA_UART_BAUDRATE
+        int "Default baudrate for Altera UART ports"
+        depends on SERIAL_ALTERA_UART
+        default 115200
+        help
+          This setting lets you define what the default baudrate is for the
+          Altera UART ports. The usual default varies from board to board,
+          and this setting is a way of catering for that.
+
+config SERIAL_ALTERA_UART_CONSOLE
+        bool "Altera UART console support"
+        depends on SERIAL_ALTERA_UART=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Enable a Altera UART port to be the system console.
+
+config SERIAL_IFX6X60
+        tristate "SPI protocol driver for Infineon 6x60 modem (EXPERIMENTAL)"
+        depends on GPIOLIB && SPI && EXPERIMENTAL
+        help
+          Support for the IFX6x60 modem devices on Intel MID platforms.
+
+config SERIAL_PCH_UART
+        tristate "Intel EG20T PCH / OKI SEMICONDUCTOR IOH(ML7213/ML7223) UART"
+        depends on PCI
+        select SERIAL_CORE
+        help
+          This driver is for PCH(Platform controller Hub) UART of Intel EG20T
+          which is an IOH(Input/Output Hub) for x86 embedded processor.
+          Enabling PCH_DMA, this PCH UART works as DMA mode.
+
+          This driver also can be used for OKI SEMICONDUCTOR IOH(Input/
+          Output Hub), ML7213 and ML7223.
+          ML7213 IOH is for IVI(In-Vehicle Infotainment) use and ML7223 IOH is
+          for MP(Media Phone) use.
+          ML7213/ML7223 is companion chip for Intel Atom E6xx series.
+          ML7213/ML7223 is completely compatible for Intel EG20T PCH.
+
+config SERIAL_MSM_SMD
+        bool "Enable tty device interface for some SMD ports"
+        default n
+        depends on MSM_SMD
+        help
+          Enables userspace clients to read and write to some streaming SMD
+          ports via tty device interface for MSM chipset.
+
+config SERIAL_MXS_AUART
+        depends on ARCH_MXS
+        tristate "MXS AUART support"
+        select SERIAL_CORE
+        help
+          This driver supports the MXS Application UART (AUART) port.
+
+config SERIAL_MXS_AUART_CONSOLE
+        bool "MXS AUART console support"
+        depends on SERIAL_MXS_AUART=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Enable a MXS AUART port to be the system console.
+
+config SERIAL_XILINX_PS_UART
+        tristate "Xilinx PS UART support"
+        select SERIAL_CORE
+        help
+          This driver supports the Xilinx PS UART port.
+
+config SERIAL_XILINX_PS_UART_CONSOLE
+        bool "Xilinx PS UART console support"
+        depends on SERIAL_XILINX_PS_UART=y
+        select SERIAL_CORE_CONSOLE
+        help
+          Enable a Xilinx PS UART port to be the system console.
+
+endmenu
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
new file mode 100644
index 000000000000..cb2628fee4c7
--- /dev/null
+++ b/drivers/tty/serial/Makefile
@@ -0,0 +1,98 @@
+#
+# Makefile for the kernel serial device drivers.
+#
+
+obj-$(CONFIG_SERIAL_CORE) += serial_core.o
+obj-$(CONFIG_SERIAL_21285) += 21285.o
+
+# These Sparc drivers have to appear before others such as 8250
+# which share ttySx minor node space.  Otherwise console device
+# names change and other unplesantries.
+obj-$(CONFIG_SERIAL_SUNCORE) += suncore.o
+obj-$(CONFIG_SERIAL_SUNHV) += sunhv.o
+obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
+obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
+obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
+
+obj-$(CONFIG_SERIAL_8250) += 8250.o
+obj-$(CONFIG_SERIAL_8250_PNP) += 8250_pnp.o
+obj-$(CONFIG_SERIAL_8250_GSC) += 8250_gsc.o
+obj-$(CONFIG_SERIAL_8250_PCI) += 8250_pci.o
+obj-$(CONFIG_SERIAL_8250_HP300) += 8250_hp300.o
+obj-$(CONFIG_SERIAL_8250_CS) += serial_cs.o
+obj-$(CONFIG_SERIAL_8250_ACORN) += 8250_acorn.o
+obj-$(CONFIG_SERIAL_8250_CONSOLE) += 8250_early.o
+obj-$(CONFIG_SERIAL_8250_FOURPORT) += 8250_fourport.o
+obj-$(CONFIG_SERIAL_8250_ACCENT) += 8250_accent.o
+obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_boca.o
+obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
+obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
+obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
+obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
+obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
+obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
+obj-$(CONFIG_SERIAL_PXA) += pxa.o
+obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
+obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
+obj-$(CONFIG_SERIAL_BCM63XX) += bcm63xx_uart.o
+obj-$(CONFIG_SERIAL_BFIN) += bfin_5xx.o
+obj-$(CONFIG_SERIAL_BFIN_SPORT) += bfin_sport_uart.o
+obj-$(CONFIG_SERIAL_SAMSUNG) += samsung.o
+obj-$(CONFIG_SERIAL_S3C2400) += s3c2400.o
+obj-$(CONFIG_SERIAL_S3C2410) += s3c2410.o
+obj-$(CONFIG_SERIAL_S3C2412) += s3c2412.o
+obj-$(CONFIG_SERIAL_S3C2440) += s3c2440.o
+obj-$(CONFIG_SERIAL_S3C24A0) += s3c24a0.o
+obj-$(CONFIG_SERIAL_S3C6400) += s3c6400.o
+obj-$(CONFIG_SERIAL_S5PV210) += s5pv210.o
+obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
+obj-$(CONFIG_SERIAL_MAX3107) += max3107.o
+obj-$(CONFIG_SERIAL_MAX3107_AAVA) += max3107-aava.o
+obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
+obj-$(CONFIG_SERIAL_MUX) += mux.o
+obj-$(CONFIG_SERIAL_68328) += 68328serial.o
+obj-$(CONFIG_SERIAL_68360) += 68360serial.o
+obj-$(CONFIG_SERIAL_MCF) += mcf.o
+obj-$(CONFIG_SERIAL_PMACZILOG) += pmac_zilog.o
+obj-$(CONFIG_SERIAL_DZ) += dz.o
+obj-$(CONFIG_SERIAL_ZS) += zs.o
+obj-$(CONFIG_SERIAL_SH_SCI) += sh-sci.o
+obj-$(CONFIG_SERIAL_SGI_L1_CONSOLE) += sn_console.o
+obj-$(CONFIG_SERIAL_CPM) += cpm_uart/
+obj-$(CONFIG_SERIAL_IMX) += imx.o
+obj-$(CONFIG_SERIAL_MPC52xx) += mpc52xx_uart.o
+obj-$(CONFIG_SERIAL_ICOM) += icom.o
+obj-$(CONFIG_SERIAL_M32R_SIO) += m32r_sio.o
+obj-$(CONFIG_SERIAL_MPSC) += mpsc.o
+obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
+obj-$(CONFIG_ETRAX_SERIAL) += crisv10.o
+obj-$(CONFIG_SERIAL_SC26XX) += sc26xx.o
+obj-$(CONFIG_SERIAL_JSM) += jsm/
+obj-$(CONFIG_SERIAL_TXX9) += serial_txx9.o
+obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_siu.o
+obj-$(CONFIG_SERIAL_SGI_IOC4) += ioc4_serial.o
+obj-$(CONFIG_SERIAL_SGI_IOC3) += ioc3_serial.o
+obj-$(CONFIG_SERIAL_ATMEL) += atmel_serial.o
+obj-$(CONFIG_SERIAL_UARTLITE) += uartlite.o
+obj-$(CONFIG_SERIAL_MSM) += msm_serial.o
+obj-$(CONFIG_SERIAL_MSM_HS) += msm_serial_hs.o
+obj-$(CONFIG_SERIAL_NETX) += netx-serial.o
+obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
+obj-$(CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL) += nwpserial.o
+obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
+obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
+obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o
+obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
+obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o
+obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
+obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o
+obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
+obj-$(CONFIG_SERIAL_VT8500) += vt8500_serial.o
+obj-$(CONFIG_SERIAL_MRST_MAX3110)       += mrst_max3110.o
+obj-$(CONFIG_SERIAL_MFD_HSU)    += mfd.o
+obj-$(CONFIG_SERIAL_IFX6X60)    += ifx6x60.o
+obj-$(CONFIG_SERIAL_PCH_UART)   += pch_uart.o
+obj-$(CONFIG_SERIAL_MSM_SMD)    += msm_smd_tty.o
+obj-$(CONFIG_SERIAL_MXS_AUART) += mxs-auart.o
+obj-$(CONFIG_SERIAL_LANTIQ)     += lantiq.o
+obj-$(CONFIG_SERIAL_XILINX_PS_UART) += xilinx_uartps.o
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
new file mode 100644
index 000000000000..60e049b041a7
--- /dev/null
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -0,0 +1,516 @@
+/*
+ * altera_jtaguart.c -- Altera JTAG UART driver
+ *
+ * Based on mcf.c -- Freescale ColdFire UART driver
+ *
+ * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
+ * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
+ * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/altera_jtaguart.h>
+
+#define DRV_NAME "altera_jtaguart"
+
+/*
+ * Altera JTAG UART register definitions according to the Altera JTAG UART
+ * datasheet: http://www.altera.com/literature/hb/nios2/n2cpu_nii51009.pdf
+ */
+
+#define ALTERA_JTAGUART_SIZE                    8
+
+#define ALTERA_JTAGUART_DATA_REG                0
+
+#define ALTERA_JTAGUART_DATA_DATA_MSK           0x000000FF
+#define ALTERA_JTAGUART_DATA_RVALID_MSK         0x00008000
+#define ALTERA_JTAGUART_DATA_RAVAIL_MSK         0xFFFF0000
+#define ALTERA_JTAGUART_DATA_RAVAIL_OFF         16
+
+#define ALTERA_JTAGUART_CONTROL_REG             4
+
+#define ALTERA_JTAGUART_CONTROL_RE_MSK          0x00000001
+#define ALTERA_JTAGUART_CONTROL_WE_MSK          0x00000002
+#define ALTERA_JTAGUART_CONTROL_RI_MSK          0x00000100
+#define ALTERA_JTAGUART_CONTROL_RI_OFF          8
+#define ALTERA_JTAGUART_CONTROL_WI_MSK          0x00000200
+#define ALTERA_JTAGUART_CONTROL_AC_MSK          0x00000400
+#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK      0xFFFF0000
+#define ALTERA_JTAGUART_CONTROL_WSPACE_OFF      16
+
+/*
+ * Local per-uart structure.
+ */
+struct altera_jtaguart {
+        struct uart_port port;
+        unsigned int sigs;      /* Local copy of line sigs */
+        unsigned long imr;      /* Local IMR mirror */
+};
+
+static unsigned int altera_jtaguart_tx_empty(struct uart_port *port)
+{
+        return (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
+                ALTERA_JTAGUART_CONTROL_WSPACE_MSK) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int altera_jtaguart_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+static void altera_jtaguart_set_mctrl(struct uart_port *port, unsigned int sigs)
+{
+}
+
+static void altera_jtaguart_start_tx(struct uart_port *port)
+{
+        struct altera_jtaguart *pp =
+            container_of(port, struct altera_jtaguart, port);
+
+        pp->imr |= ALTERA_JTAGUART_CONTROL_WE_MSK;
+        writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
+}
+
+static void altera_jtaguart_stop_tx(struct uart_port *port)
+{
+        struct altera_jtaguart *pp =
+            container_of(port, struct altera_jtaguart, port);
+
+        pp->imr &= ~ALTERA_JTAGUART_CONTROL_WE_MSK;
+        writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
+}
+
+static void altera_jtaguart_stop_rx(struct uart_port *port)
+{
+        struct altera_jtaguart *pp =
+            container_of(port, struct altera_jtaguart, port);
+
+        pp->imr &= ~ALTERA_JTAGUART_CONTROL_RE_MSK;
+        writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
+}
+
+static void altera_jtaguart_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static void altera_jtaguart_enable_ms(struct uart_port *port)
+{
+}
+
+static void altera_jtaguart_set_termios(struct uart_port *port,
+                                        struct ktermios *termios,
+                                        struct ktermios *old)
+{
+        /* Just copy the old termios settings back */
+        if (old)
+                tty_termios_copy_hw(termios, old);
+}
+
+static void altera_jtaguart_rx_chars(struct altera_jtaguart *pp)
+{
+        struct uart_port *port = &pp->port;
+        unsigned char ch, flag;
+        unsigned long status;
+
+        while ((status = readl(port->membase + ALTERA_JTAGUART_DATA_REG)) &
+               ALTERA_JTAGUART_DATA_RVALID_MSK) {
+                ch = status & ALTERA_JTAGUART_DATA_DATA_MSK;
+                flag = TTY_NORMAL;
+                port->icount.rx++;
+
+                if (uart_handle_sysrq_char(port, ch))
+                        continue;
+                uart_insert_char(port, 0, 0, ch, flag);
+        }
+
+        tty_flip_buffer_push(port->state->port.tty);
+}
+
+static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp)
+{
+        struct uart_port *port = &pp->port;
+        struct circ_buf *xmit = &port->state->xmit;
+        unsigned int pending, count;
+
+        if (port->x_char) {
+                /* Send special char - probably flow control */
+                writel(port->x_char, port->membase + ALTERA_JTAGUART_DATA_REG);
+                port->x_char = 0;
+                port->icount.tx++;
+                return;
+        }
+
+        pending = uart_circ_chars_pending(xmit);
+        if (pending > 0) {
+                count = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
+                                ALTERA_JTAGUART_CONTROL_WSPACE_MSK) >>
+                        ALTERA_JTAGUART_CONTROL_WSPACE_OFF;
+                if (count > pending)
+                        count = pending;
+                if (count > 0) {
+                        pending -= count;
+                        while (count--) {
+                                writel(xmit->buf[xmit->tail],
+                                       port->membase + ALTERA_JTAGUART_DATA_REG);
+                                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                                port->icount.tx++;
+                        }
+                        if (pending < WAKEUP_CHARS)
+                                uart_write_wakeup(port);
+                }
+        }
+
+        if (pending == 0) {
+                pp->imr &= ~ALTERA_JTAGUART_CONTROL_WE_MSK;
+                writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
+        }
+}
+
+static irqreturn_t altera_jtaguart_interrupt(int irq, void *data)
+{
+        struct uart_port *port = data;
+        struct altera_jtaguart *pp =
+            container_of(port, struct altera_jtaguart, port);
+        unsigned int isr;
+
+        isr = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) >>
+               ALTERA_JTAGUART_CONTROL_RI_OFF) & pp->imr;
+
+        spin_lock(&port->lock);
+
+        if (isr & ALTERA_JTAGUART_CONTROL_RE_MSK)
+                altera_jtaguart_rx_chars(pp);
+        if (isr & ALTERA_JTAGUART_CONTROL_WE_MSK)
+                altera_jtaguart_tx_chars(pp);
+
+        spin_unlock(&port->lock);
+
+        return IRQ_RETVAL(isr);
+}
+
+static void altera_jtaguart_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_ALTERA_JTAGUART;
+
+        /* Clear mask, so no surprise interrupts. */
+        writel(0, port->membase + ALTERA_JTAGUART_CONTROL_REG);
+}
+
+static int altera_jtaguart_startup(struct uart_port *port)
+{
+        struct altera_jtaguart *pp =
+            container_of(port, struct altera_jtaguart, port);
+        unsigned long flags;
+        int ret;
+
+        ret = request_irq(port->irq, altera_jtaguart_interrupt, IRQF_DISABLED,
+                        DRV_NAME, port);
+        if (ret) {
+                pr_err(DRV_NAME ": unable to attach Altera JTAG UART %d "
+                       "interrupt vector=%d\n", port->line, port->irq);
+                return ret;
+        }
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Enable RX interrupts now */
+        pp->imr = ALTERA_JTAGUART_CONTROL_RE_MSK;
+        writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        return 0;
+}
+
+static void altera_jtaguart_shutdown(struct uart_port *port)
+{
+        struct altera_jtaguart *pp =
+            container_of(port, struct altera_jtaguart, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Disable all interrupts now */
+        pp->imr = 0;
+        writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        free_irq(port->irq, port);
+}
+
+static const char *altera_jtaguart_type(struct uart_port *port)
+{
+        return (port->type == PORT_ALTERA_JTAGUART) ? "Altera JTAG UART" : NULL;
+}
+
+static int altera_jtaguart_request_port(struct uart_port *port)
+{
+        /* UARTs always present */
+        return 0;
+}
+
+static void altera_jtaguart_release_port(struct uart_port *port)
+{
+        /* Nothing to release... */
+}
+
+static int altera_jtaguart_verify_port(struct uart_port *port,
+                                       struct serial_struct *ser)
+{
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_ALTERA_JTAGUART)
+                return -EINVAL;
+        return 0;
+}
+
+/*
+ *      Define the basic serial functions we support.
+ */
+static struct uart_ops altera_jtaguart_ops = {
+        .tx_empty       = altera_jtaguart_tx_empty,
+        .get_mctrl      = altera_jtaguart_get_mctrl,
+        .set_mctrl      = altera_jtaguart_set_mctrl,
+        .start_tx       = altera_jtaguart_start_tx,
+        .stop_tx        = altera_jtaguart_stop_tx,
+        .stop_rx        = altera_jtaguart_stop_rx,
+        .enable_ms      = altera_jtaguart_enable_ms,
+        .break_ctl      = altera_jtaguart_break_ctl,
+        .startup        = altera_jtaguart_startup,
+        .shutdown       = altera_jtaguart_shutdown,
+        .set_termios    = altera_jtaguart_set_termios,
+        .type           = altera_jtaguart_type,
+        .request_port   = altera_jtaguart_request_port,
+        .release_port   = altera_jtaguart_release_port,
+        .config_port    = altera_jtaguart_config_port,
+        .verify_port    = altera_jtaguart_verify_port,
+};
+
+#define ALTERA_JTAGUART_MAXPORTS 1
+static struct altera_jtaguart altera_jtaguart_ports[ALTERA_JTAGUART_MAXPORTS];
+
+#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE)
+
+#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
+static void altera_jtaguart_console_putc(struct console *co, const char c)
+{
+        struct uart_port *port = &(altera_jtaguart_ports + co->index)->port;
+        unsigned long status;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        while (((status = readl(port->membase + ALTERA_JTAGUART_CONTROL_REG)) &
+                ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
+                if ((status & ALTERA_JTAGUART_CONTROL_AC_MSK) == 0) {
+                        spin_unlock_irqrestore(&port->lock, flags);
+                        return; /* no connection activity */
+                }
+                spin_unlock_irqrestore(&port->lock, flags);
+                cpu_relax();
+                spin_lock_irqsave(&port->lock, flags);
+        }
+        writel(c, port->membase + ALTERA_JTAGUART_DATA_REG);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+#else
+static void altera_jtaguart_console_putc(struct console *co, const char c)
+{
+        struct uart_port *port = &(altera_jtaguart_ports + co->index)->port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        while ((readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
+                ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                cpu_relax();
+                spin_lock_irqsave(&port->lock, flags);
+        }
+        writel(c, port->membase + ALTERA_JTAGUART_DATA_REG);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+#endif
+
+static void altera_jtaguart_console_write(struct console *co, const char *s,
+                                          unsigned int count)
+{
+        for (; count; count--, s++) {
+                altera_jtaguart_console_putc(co, *s);
+                if (*s == '\n')
+                        altera_jtaguart_console_putc(co, '\r');
+        }
+}
+
+static int __init altera_jtaguart_console_setup(struct console *co,
+                                                char *options)
+{
+        struct uart_port *port;
+
+        if (co->index < 0 || co->index >= ALTERA_JTAGUART_MAXPORTS)
+                return -EINVAL;
+        port = &altera_jtaguart_ports[co->index].port;
+        if (port->membase == NULL)
+                return -ENODEV;
+        return 0;
+}
+
+static struct uart_driver altera_jtaguart_driver;
+
+static struct console altera_jtaguart_console = {
+        .name   = "ttyJ",
+        .write  = altera_jtaguart_console_write,
+        .device = uart_console_device,
+        .setup  = altera_jtaguart_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+        .data   = &altera_jtaguart_driver,
+};
+
+static int __init altera_jtaguart_console_init(void)
+{
+        register_console(&altera_jtaguart_console);
+        return 0;
+}
+
+console_initcall(altera_jtaguart_console_init);
+
+#define ALTERA_JTAGUART_CONSOLE (&altera_jtaguart_console)
+
+#else
+
+#define ALTERA_JTAGUART_CONSOLE NULL
+
+#endif /* CONFIG_ALTERA_JTAGUART_CONSOLE */
+
+static struct uart_driver altera_jtaguart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "altera_jtaguart",
+        .dev_name       = "ttyJ",
+        .major          = ALTERA_JTAGUART_MAJOR,
+        .minor          = ALTERA_JTAGUART_MINOR,
+        .nr             = ALTERA_JTAGUART_MAXPORTS,
+        .cons           = ALTERA_JTAGUART_CONSOLE,
+};
+
+static int __devinit altera_jtaguart_probe(struct platform_device *pdev)
+{
+        struct altera_jtaguart_platform_uart *platp = pdev->dev.platform_data;
+        struct uart_port *port;
+        struct resource *res_irq, *res_mem;
+        int i = pdev->id;
+
+        /* -1 emphasizes that the platform must have one port, no .N suffix */
+        if (i == -1)
+                i = 0;
+
+        if (i >= ALTERA_JTAGUART_MAXPORTS)
+                return -EINVAL;
+
+        port = &altera_jtaguart_ports[i].port;
+
+        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res_mem)
+                port->mapbase = res_mem->start;
+        else if (platp)
+                port->mapbase = platp->mapbase;
+        else
+                return -ENODEV;
+
+        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (res_irq)
+                port->irq = res_irq->start;
+        else if (platp)
+                port->irq = platp->irq;
+        else
+                return -ENODEV;
+
+        port->membase = ioremap(port->mapbase, ALTERA_JTAGUART_SIZE);
+        if (!port->membase)
+                return -ENOMEM;
+
+        port->line = i;
+        port->type = PORT_ALTERA_JTAGUART;
+        port->iotype = SERIAL_IO_MEM;
+        port->ops = &altera_jtaguart_ops;
+        port->flags = UPF_BOOT_AUTOCONF;
+
+        uart_add_one_port(&altera_jtaguart_driver, port);
+
+        return 0;
+}
+
+static int __devexit altera_jtaguart_remove(struct platform_device *pdev)
+{
+        struct uart_port *port;
+        int i = pdev->id;
+
+        if (i == -1)
+                i = 0;
+
+        port = &altera_jtaguart_ports[i].port;
+        uart_remove_one_port(&altera_jtaguart_driver, port);
+
+        return 0;
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id altera_jtaguart_match[] = {
+        { .compatible = "ALTR,juart-1.0", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, altera_jtaguart_match);
+#else
+#define altera_jtaguart_match NULL
+#endif /* CONFIG_OF */
+
+static struct platform_driver altera_jtaguart_platform_driver = {
+        .probe  = altera_jtaguart_probe,
+        .remove = __devexit_p(altera_jtaguart_remove),
+        .driver = {
+                .name           = DRV_NAME,
+                .owner          = THIS_MODULE,
+                .of_match_table = altera_jtaguart_match,
+        },
+};
+
+static int __init altera_jtaguart_init(void)
+{
+        int rc;
+
+        rc = uart_register_driver(&altera_jtaguart_driver);
+        if (rc)
+                return rc;
+        rc = platform_driver_register(&altera_jtaguart_platform_driver);
+        if (rc) {
+                uart_unregister_driver(&altera_jtaguart_driver);
+                return rc;
+        }
+        return 0;
+}
+
+static void __exit altera_jtaguart_exit(void)
+{
+        platform_driver_unregister(&altera_jtaguart_platform_driver);
+        uart_unregister_driver(&altera_jtaguart_driver);
+}
+
+module_init(altera_jtaguart_init);
+module_exit(altera_jtaguart_exit);
+
+MODULE_DESCRIPTION("Altera JTAG UART driver");
+MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
new file mode 100644
index 000000000000..50bc5a5ac653
--- /dev/null
+++ b/drivers/tty/serial/altera_uart.c
@@ -0,0 +1,661 @@
+/*
+ * altera_uart.c -- Altera UART driver
+ *
+ * Based on mcf.c -- Freescale ColdFire UART driver
+ *
+ * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
+ * (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
+ * (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/io.h>
+#include <linux/altera_uart.h>
+
+#define DRV_NAME "altera_uart"
+#define SERIAL_ALTERA_MAJOR 204
+#define SERIAL_ALTERA_MINOR 213
+
+/*
+ * Altera UART register definitions according to the Nios UART datasheet:
+ * http://www.altera.com/literature/ds/ds_nios_uart.pdf
+ */
+
+#define ALTERA_UART_SIZE                32
+
+#define ALTERA_UART_RXDATA_REG          0
+#define ALTERA_UART_TXDATA_REG          4
+#define ALTERA_UART_STATUS_REG          8
+#define ALTERA_UART_CONTROL_REG         12
+#define ALTERA_UART_DIVISOR_REG         16
+#define ALTERA_UART_EOP_REG             20
+
+#define ALTERA_UART_STATUS_PE_MSK       0x0001  /* parity error */
+#define ALTERA_UART_STATUS_FE_MSK       0x0002  /* framing error */
+#define ALTERA_UART_STATUS_BRK_MSK      0x0004  /* break */
+#define ALTERA_UART_STATUS_ROE_MSK      0x0008  /* RX overrun error */
+#define ALTERA_UART_STATUS_TOE_MSK      0x0010  /* TX overrun error */
+#define ALTERA_UART_STATUS_TMT_MSK      0x0020  /* TX shift register state */
+#define ALTERA_UART_STATUS_TRDY_MSK     0x0040  /* TX ready */
+#define ALTERA_UART_STATUS_RRDY_MSK     0x0080  /* RX ready */
+#define ALTERA_UART_STATUS_E_MSK        0x0100  /* exception condition */
+#define ALTERA_UART_STATUS_DCTS_MSK     0x0400  /* CTS logic-level change */
+#define ALTERA_UART_STATUS_CTS_MSK      0x0800  /* CTS logic state */
+#define ALTERA_UART_STATUS_EOP_MSK      0x1000  /* EOP written/read */
+
+                                                /* Enable interrupt on... */
+#define ALTERA_UART_CONTROL_PE_MSK      0x0001  /* ...parity error */
+#define ALTERA_UART_CONTROL_FE_MSK      0x0002  /* ...framing error */
+#define ALTERA_UART_CONTROL_BRK_MSK     0x0004  /* ...break */
+#define ALTERA_UART_CONTROL_ROE_MSK     0x0008  /* ...RX overrun */
+#define ALTERA_UART_CONTROL_TOE_MSK     0x0010  /* ...TX overrun */
+#define ALTERA_UART_CONTROL_TMT_MSK     0x0020  /* ...TX shift register empty */
+#define ALTERA_UART_CONTROL_TRDY_MSK    0x0040  /* ...TX ready */
+#define ALTERA_UART_CONTROL_RRDY_MSK    0x0080  /* ...RX ready */
+#define ALTERA_UART_CONTROL_E_MSK       0x0100  /* ...exception*/
+
+#define ALTERA_UART_CONTROL_TRBK_MSK    0x0200  /* TX break */
+#define ALTERA_UART_CONTROL_DCTS_MSK    0x0400  /* Interrupt on CTS change */
+#define ALTERA_UART_CONTROL_RTS_MSK     0x0800  /* RTS signal */
+#define ALTERA_UART_CONTROL_EOP_MSK     0x1000  /* Interrupt on EOP */
+
+/*
+ * Local per-uart structure.
+ */
+struct altera_uart {
+        struct uart_port port;
+        struct timer_list tmr;
+        unsigned int sigs;      /* Local copy of line sigs */
+        unsigned short imr;     /* Local IMR mirror */
+};
+
+static u32 altera_uart_readl(struct uart_port *port, int reg)
+{
+        return readl(port->membase + (reg << port->regshift));
+}
+
+static void altera_uart_writel(struct uart_port *port, u32 dat, int reg)
+{
+        writel(dat, port->membase + (reg << port->regshift));
+}
+
+static unsigned int altera_uart_tx_empty(struct uart_port *port)
+{
+        return (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
+                ALTERA_UART_STATUS_TMT_MSK) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int altera_uart_get_mctrl(struct uart_port *port)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+        unsigned int sigs;
+
+        sigs = (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
+             ALTERA_UART_STATUS_CTS_MSK) ? TIOCM_CTS : 0;
+        sigs |= (pp->sigs & TIOCM_RTS);
+
+        return sigs;
+}
+
+static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+
+        pp->sigs = sigs;
+        if (sigs & TIOCM_RTS)
+                pp->imr |= ALTERA_UART_CONTROL_RTS_MSK;
+        else
+                pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK;
+        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
+}
+
+static void altera_uart_start_tx(struct uart_port *port)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+
+        pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK;
+        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
+}
+
+static void altera_uart_stop_tx(struct uart_port *port)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+
+        pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
+        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
+}
+
+static void altera_uart_stop_rx(struct uart_port *port)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+
+        pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK;
+        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
+}
+
+static void altera_uart_break_ctl(struct uart_port *port, int break_state)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        if (break_state == -1)
+                pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK;
+        else
+                pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK;
+        altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void altera_uart_enable_ms(struct uart_port *port)
+{
+}
+
+static void altera_uart_set_termios(struct uart_port *port,
+                                    struct ktermios *termios,
+                                    struct ktermios *old)
+{
+        unsigned long flags;
+        unsigned int baud, baudclk;
+
+        baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
+        baudclk = port->uartclk / baud;
+
+        if (old)
+                tty_termios_copy_hw(termios, old);
+        tty_termios_encode_baud_rate(termios, baud, baud);
+
+        spin_lock_irqsave(&port->lock, flags);
+        uart_update_timeout(port, termios->c_cflag, baud);
+        altera_uart_writel(port, baudclk, ALTERA_UART_DIVISOR_REG);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void altera_uart_rx_chars(struct altera_uart *pp)
+{
+        struct uart_port *port = &pp->port;
+        unsigned char ch, flag;
+        unsigned short status;
+
+        while ((status = altera_uart_readl(port, ALTERA_UART_STATUS_REG)) &
+               ALTERA_UART_STATUS_RRDY_MSK) {
+                ch = altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
+                flag = TTY_NORMAL;
+                port->icount.rx++;
+
+                if (status & ALTERA_UART_STATUS_E_MSK) {
+                        altera_uart_writel(port, status,
+                                           ALTERA_UART_STATUS_REG);
+
+                        if (status & ALTERA_UART_STATUS_BRK_MSK) {
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        continue;
+                        } else if (status & ALTERA_UART_STATUS_PE_MSK) {
+                                port->icount.parity++;
+                        } else if (status & ALTERA_UART_STATUS_ROE_MSK) {
+                                port->icount.overrun++;
+                        } else if (status & ALTERA_UART_STATUS_FE_MSK) {
+                                port->icount.frame++;
+                        }
+
+                        status &= port->read_status_mask;
+
+                        if (status & ALTERA_UART_STATUS_BRK_MSK)
+                                flag = TTY_BREAK;
+                        else if (status & ALTERA_UART_STATUS_PE_MSK)
+                                flag = TTY_PARITY;
+                        else if (status & ALTERA_UART_STATUS_FE_MSK)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        continue;
+                uart_insert_char(port, status, ALTERA_UART_STATUS_ROE_MSK, ch,
+                                 flag);
+        }
+
+        tty_flip_buffer_push(port->state->port.tty);
+}
+
+static void altera_uart_tx_chars(struct altera_uart *pp)
+{
+        struct uart_port *port = &pp->port;
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (port->x_char) {
+                /* Send special char - probably flow control */
+                altera_uart_writel(port, port->x_char, ALTERA_UART_TXDATA_REG);
+                port->x_char = 0;
+                port->icount.tx++;
+                return;
+        }
+
+        while (altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
+               ALTERA_UART_STATUS_TRDY_MSK) {
+                if (xmit->head == xmit->tail)
+                        break;
+                altera_uart_writel(port, xmit->buf[xmit->tail],
+                       ALTERA_UART_TXDATA_REG);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (xmit->head == xmit->tail) {
+                pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK;
+                altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG);
+        }
+}
+
+static irqreturn_t altera_uart_interrupt(int irq, void *data)
+{
+        struct uart_port *port = data;
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+        unsigned int isr;
+
+        isr = altera_uart_readl(port, ALTERA_UART_STATUS_REG) & pp->imr;
+
+        spin_lock(&port->lock);
+        if (isr & ALTERA_UART_STATUS_RRDY_MSK)
+                altera_uart_rx_chars(pp);
+        if (isr & ALTERA_UART_STATUS_TRDY_MSK)
+                altera_uart_tx_chars(pp);
+        spin_unlock(&port->lock);
+
+        return IRQ_RETVAL(isr);
+}
+
+static void altera_uart_timer(unsigned long data)
+{
+        struct uart_port *port = (void *)data;
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+
+        altera_uart_interrupt(0, port);
+        mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
+}
+
+static void altera_uart_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_ALTERA_UART;
+
+        /* Clear mask, so no surprise interrupts. */
+        altera_uart_writel(port, 0, ALTERA_UART_CONTROL_REG);
+        /* Clear status register */
+        altera_uart_writel(port, 0, ALTERA_UART_STATUS_REG);
+}
+
+static int altera_uart_startup(struct uart_port *port)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+        unsigned long flags;
+        int ret;
+
+        if (!port->irq) {
+                setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
+                mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
+                return 0;
+        }
+
+        ret = request_irq(port->irq, altera_uart_interrupt, IRQF_DISABLED,
+                        DRV_NAME, port);
+        if (ret) {
+                pr_err(DRV_NAME ": unable to attach Altera UART %d "
+                       "interrupt vector=%d\n", port->line, port->irq);
+                return ret;
+        }
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Enable RX interrupts now */
+        pp->imr = ALTERA_UART_CONTROL_RRDY_MSK;
+        writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        return 0;
+}
+
+static void altera_uart_shutdown(struct uart_port *port)
+{
+        struct altera_uart *pp = container_of(port, struct altera_uart, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Disable all interrupts now */
+        pp->imr = 0;
+        writel(pp->imr, port->membase + ALTERA_UART_CONTROL_REG);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        if (port->irq)
+                free_irq(port->irq, port);
+        else
+                del_timer_sync(&pp->tmr);
+}
+
+static const char *altera_uart_type(struct uart_port *port)
+{
+        return (port->type == PORT_ALTERA_UART) ? "Altera UART" : NULL;
+}
+
+static int altera_uart_request_port(struct uart_port *port)
+{
+        /* UARTs always present */
+        return 0;
+}
+
+static void altera_uart_release_port(struct uart_port *port)
+{
+        /* Nothing to release... */
+}
+
+static int altera_uart_verify_port(struct uart_port *port,
+                                   struct serial_struct *ser)
+{
+        if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_ALTERA_UART))
+                return -EINVAL;
+        return 0;
+}
+
+/*
+ *      Define the basic serial functions we support.
+ */
+static struct uart_ops altera_uart_ops = {
+        .tx_empty       = altera_uart_tx_empty,
+        .get_mctrl      = altera_uart_get_mctrl,
+        .set_mctrl      = altera_uart_set_mctrl,
+        .start_tx       = altera_uart_start_tx,
+        .stop_tx        = altera_uart_stop_tx,
+        .stop_rx        = altera_uart_stop_rx,
+        .enable_ms      = altera_uart_enable_ms,
+        .break_ctl      = altera_uart_break_ctl,
+        .startup        = altera_uart_startup,
+        .shutdown       = altera_uart_shutdown,
+        .set_termios    = altera_uart_set_termios,
+        .type           = altera_uart_type,
+        .request_port   = altera_uart_request_port,
+        .release_port   = altera_uart_release_port,
+        .config_port    = altera_uart_config_port,
+        .verify_port    = altera_uart_verify_port,
+};
+
+static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
+
+#if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
+
+int __init early_altera_uart_setup(struct altera_uart_platform_uart *platp)
+{
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS && platp[i].mapbase; i++) {
+                port = &altera_uart_ports[i].port;
+
+                port->line = i;
+                port->type = PORT_ALTERA_UART;
+                port->mapbase = platp[i].mapbase;
+                port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
+                port->iotype = SERIAL_IO_MEM;
+                port->irq = platp[i].irq;
+                port->uartclk = platp[i].uartclk;
+                port->flags = UPF_BOOT_AUTOCONF;
+                port->ops = &altera_uart_ops;
+                port->private_data = platp;
+        }
+
+        return 0;
+}
+
+static void altera_uart_console_putc(struct uart_port *port, const char c)
+{
+        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
+                 ALTERA_UART_STATUS_TRDY_MSK))
+                cpu_relax();
+
+        writel(c, port->membase + ALTERA_UART_TXDATA_REG);
+}
+
+static void altera_uart_console_write(struct console *co, const char *s,
+                                      unsigned int count)
+{
+        struct uart_port *port = &(altera_uart_ports + co->index)->port;
+
+        for (; count; count--, s++) {
+                altera_uart_console_putc(port, *s);
+                if (*s == '\n')
+                        altera_uart_console_putc(port, '\r');
+        }
+}
+
+static int __init altera_uart_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (co->index < 0 || co->index >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
+                return -EINVAL;
+        port = &altera_uart_ports[co->index].port;
+        if (!port->membase)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver altera_uart_driver;
+
+static struct console altera_uart_console = {
+        .name   = "ttyAL",
+        .write  = altera_uart_console_write,
+        .device = uart_console_device,
+        .setup  = altera_uart_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+        .data   = &altera_uart_driver,
+};
+
+static int __init altera_uart_console_init(void)
+{
+        register_console(&altera_uart_console);
+        return 0;
+}
+
+console_initcall(altera_uart_console_init);
+
+#define ALTERA_UART_CONSOLE     (&altera_uart_console)
+
+#else
+
+#define ALTERA_UART_CONSOLE     NULL
+
+#endif /* CONFIG_ALTERA_UART_CONSOLE */
+
+/*
+ *      Define the altera_uart UART driver structure.
+ */
+static struct uart_driver altera_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = DRV_NAME,
+        .dev_name       = "ttyAL",
+        .major          = SERIAL_ALTERA_MAJOR,
+        .minor          = SERIAL_ALTERA_MINOR,
+        .nr             = CONFIG_SERIAL_ALTERA_UART_MAXPORTS,
+        .cons           = ALTERA_UART_CONSOLE,
+};
+
+#ifdef CONFIG_OF
+static int altera_uart_get_of_uartclk(struct platform_device *pdev,
+                                      struct uart_port *port)
+{
+        int len;
+        const __be32 *clk;
+
+        clk = of_get_property(pdev->dev.of_node, "clock-frequency", &len);
+        if (!clk || len < sizeof(__be32))
+                return -ENODEV;
+
+        port->uartclk = be32_to_cpup(clk);
+
+        return 0;
+}
+#else
+static int altera_uart_get_of_uartclk(struct platform_device *pdev,
+                                      struct uart_port *port)
+{
+        return -ENODEV;
+}
+#endif /* CONFIG_OF */
+
+static int __devinit altera_uart_probe(struct platform_device *pdev)
+{
+        struct altera_uart_platform_uart *platp = pdev->dev.platform_data;
+        struct uart_port *port;
+        struct resource *res_mem;
+        struct resource *res_irq;
+        int i = pdev->id;
+        int ret;
+
+        /* if id is -1 scan for a free id and use that one */
+        if (i == -1) {
+                for (i = 0; i < CONFIG_SERIAL_ALTERA_UART_MAXPORTS; i++)
+                        if (altera_uart_ports[i].port.mapbase == 0)
+                                break;
+        }
+
+        if (i < 0 || i >= CONFIG_SERIAL_ALTERA_UART_MAXPORTS)
+                return -EINVAL;
+
+        port = &altera_uart_ports[i].port;
+
+        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res_mem)
+                port->mapbase = res_mem->start;
+        else if (platp->mapbase)
+                port->mapbase = platp->mapbase;
+        else
+                return -EINVAL;
+
+        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (res_irq)
+                port->irq = res_irq->start;
+        else if (platp->irq)
+                port->irq = platp->irq;
+
+        /* Check platform data first so we can override device node data */
+        if (platp)
+                port->uartclk = platp->uartclk;
+        else {
+                ret = altera_uart_get_of_uartclk(pdev, port);
+                if (ret)
+                        return ret;
+        }
+
+        port->membase = ioremap(port->mapbase, ALTERA_UART_SIZE);
+        if (!port->membase)
+                return -ENOMEM;
+
+        if (platp)
+                port->regshift = platp->bus_shift;
+        else
+                port->regshift = 0;
+
+        port->line = i;
+        port->type = PORT_ALTERA_UART;
+        port->iotype = SERIAL_IO_MEM;
+        port->ops = &altera_uart_ops;
+        port->flags = UPF_BOOT_AUTOCONF;
+
+        dev_set_drvdata(&pdev->dev, port);
+
+        uart_add_one_port(&altera_uart_driver, port);
+
+        return 0;
+}
+
+static int __devexit altera_uart_remove(struct platform_device *pdev)
+{
+        struct uart_port *port = dev_get_drvdata(&pdev->dev);
+
+        if (port) {
+                uart_remove_one_port(&altera_uart_driver, port);
+                dev_set_drvdata(&pdev->dev, NULL);
+                port->mapbase = 0;
+        }
+
+        return 0;
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id altera_uart_match[] = {
+        { .compatible = "ALTR,uart-1.0", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, altera_uart_match);
+#else
+#define altera_uart_match NULL
+#endif /* CONFIG_OF */
+
+static struct platform_driver altera_uart_platform_driver = {
+        .probe  = altera_uart_probe,
+        .remove = __devexit_p(altera_uart_remove),
+        .driver = {
+                .name           = DRV_NAME,
+                .owner          = THIS_MODULE,
+                .of_match_table = altera_uart_match,
+        },
+};
+
+static int __init altera_uart_init(void)
+{
+        int rc;
+
+        rc = uart_register_driver(&altera_uart_driver);
+        if (rc)
+                return rc;
+        rc = platform_driver_register(&altera_uart_platform_driver);
+        if (rc) {
+                uart_unregister_driver(&altera_uart_driver);
+                return rc;
+        }
+        return 0;
+}
+
+static void __exit altera_uart_exit(void)
+{
+        platform_driver_unregister(&altera_uart_platform_driver);
+        uart_unregister_driver(&altera_uart_driver);
+}
+
+module_init(altera_uart_init);
+module_exit(altera_uart_exit);
+
+MODULE_DESCRIPTION("Altera UART driver");
+MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_ALTERA_MAJOR);
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
new file mode 100644
index 000000000000..c0d10c4ddb73
--- /dev/null
+++ b/drivers/tty/serial/amba-pl010.c
@@ -0,0 +1,823 @@
+/*
+ *  Driver for AMBA serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright 1999 ARM Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This is a generic driver for ARM AMBA-type serial ports.  They
+ * have a lot of 16550-like features, but are not register compatible.
+ * Note that although they do have CTS, DCD and DSR inputs, they do
+ * not have an RI input, nor do they have DTR or RTS outputs.  If
+ * required, these have to be supplied via some other means (eg, GPIO)
+ * and hooked into this driver.
+ */
+
+#if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/amba/bus.h>
+#include <linux/amba/serial.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+
+#define UART_NR         8
+
+#define SERIAL_AMBA_MAJOR       204
+#define SERIAL_AMBA_MINOR       16
+#define SERIAL_AMBA_NR          UART_NR
+
+#define AMBA_ISR_PASS_LIMIT     256
+
+#define UART_RX_DATA(s)         (((s) & UART01x_FR_RXFE) == 0)
+#define UART_TX_READY(s)        (((s) & UART01x_FR_TXFF) == 0)
+
+#define UART_DUMMY_RSR_RX       256
+#define UART_PORT_SIZE          64
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct uart_amba_port {
+        struct uart_port        port;
+        struct clk              *clk;
+        struct amba_device      *dev;
+        struct amba_pl010_data  *data;
+        unsigned int            old_status;
+};
+
+static void pl010_stop_tx(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int cr;
+
+        cr = readb(uap->port.membase + UART010_CR);
+        cr &= ~UART010_CR_TIE;
+        writel(cr, uap->port.membase + UART010_CR);
+}
+
+static void pl010_start_tx(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int cr;
+
+        cr = readb(uap->port.membase + UART010_CR);
+        cr |= UART010_CR_TIE;
+        writel(cr, uap->port.membase + UART010_CR);
+}
+
+static void pl010_stop_rx(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int cr;
+
+        cr = readb(uap->port.membase + UART010_CR);
+        cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
+        writel(cr, uap->port.membase + UART010_CR);
+}
+
+static void pl010_enable_ms(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int cr;
+
+        cr = readb(uap->port.membase + UART010_CR);
+        cr |= UART010_CR_MSIE;
+        writel(cr, uap->port.membase + UART010_CR);
+}
+
+static void pl010_rx_chars(struct uart_amba_port *uap)
+{
+        struct tty_struct *tty = uap->port.state->port.tty;
+        unsigned int status, ch, flag, rsr, max_count = 256;
+
+        status = readb(uap->port.membase + UART01x_FR);
+        while (UART_RX_DATA(status) && max_count--) {
+                ch = readb(uap->port.membase + UART01x_DR);
+                flag = TTY_NORMAL;
+
+                uap->port.icount.rx++;
+
+                /*
+                 * Note that the error handling code is
+                 * out of the main execution path
+                 */
+                rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
+                if (unlikely(rsr & UART01x_RSR_ANY)) {
+                        writel(0, uap->port.membase + UART01x_ECR);
+
+                        if (rsr & UART01x_RSR_BE) {
+                                rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
+                                uap->port.icount.brk++;
+                                if (uart_handle_break(&uap->port))
+                                        goto ignore_char;
+                        } else if (rsr & UART01x_RSR_PE)
+                                uap->port.icount.parity++;
+                        else if (rsr & UART01x_RSR_FE)
+                                uap->port.icount.frame++;
+                        if (rsr & UART01x_RSR_OE)
+                                uap->port.icount.overrun++;
+
+                        rsr &= uap->port.read_status_mask;
+
+                        if (rsr & UART01x_RSR_BE)
+                                flag = TTY_BREAK;
+                        else if (rsr & UART01x_RSR_PE)
+                                flag = TTY_PARITY;
+                        else if (rsr & UART01x_RSR_FE)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(&uap->port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag);
+
+        ignore_char:
+                status = readb(uap->port.membase + UART01x_FR);
+        }
+        spin_unlock(&uap->port.lock);
+        tty_flip_buffer_push(tty);
+        spin_lock(&uap->port.lock);
+}
+
+static void pl010_tx_chars(struct uart_amba_port *uap)
+{
+        struct circ_buf *xmit = &uap->port.state->xmit;
+        int count;
+
+        if (uap->port.x_char) {
+                writel(uap->port.x_char, uap->port.membase + UART01x_DR);
+                uap->port.icount.tx++;
+                uap->port.x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
+                pl010_stop_tx(&uap->port);
+                return;
+        }
+
+        count = uap->port.fifosize >> 1;
+        do {
+                writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                uap->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&uap->port);
+
+        if (uart_circ_empty(xmit))
+                pl010_stop_tx(&uap->port);
+}
+
+static void pl010_modem_status(struct uart_amba_port *uap)
+{
+        unsigned int status, delta;
+
+        writel(0, uap->port.membase + UART010_ICR);
+
+        status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+
+        delta = status ^ uap->old_status;
+        uap->old_status = status;
+
+        if (!delta)
+                return;
+
+        if (delta & UART01x_FR_DCD)
+                uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
+
+        if (delta & UART01x_FR_DSR)
+                uap->port.icount.dsr++;
+
+        if (delta & UART01x_FR_CTS)
+                uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
+
+        wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
+}
+
+static irqreturn_t pl010_int(int irq, void *dev_id)
+{
+        struct uart_amba_port *uap = dev_id;
+        unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
+        int handled = 0;
+
+        spin_lock(&uap->port.lock);
+
+        status = readb(uap->port.membase + UART010_IIR);
+        if (status) {
+                do {
+                        if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
+                                pl010_rx_chars(uap);
+                        if (status & UART010_IIR_MIS)
+                                pl010_modem_status(uap);
+                        if (status & UART010_IIR_TIS)
+                                pl010_tx_chars(uap);
+
+                        if (pass_counter-- == 0)
+                                break;
+
+                        status = readb(uap->port.membase + UART010_IIR);
+                } while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
+                                   UART010_IIR_TIS));
+                handled = 1;
+        }
+
+        spin_unlock(&uap->port.lock);
+
+        return IRQ_RETVAL(handled);
+}
+
+static unsigned int pl010_tx_empty(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int status = readb(uap->port.membase + UART01x_FR);
+        return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int pl010_get_mctrl(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int result = 0;
+        unsigned int status;
+
+        status = readb(uap->port.membase + UART01x_FR);
+        if (status & UART01x_FR_DCD)
+                result |= TIOCM_CAR;
+        if (status & UART01x_FR_DSR)
+                result |= TIOCM_DSR;
+        if (status & UART01x_FR_CTS)
+                result |= TIOCM_CTS;
+
+        return result;
+}
+
+static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        if (uap->data)
+                uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl);
+}
+
+static void pl010_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned long flags;
+        unsigned int lcr_h;
+
+        spin_lock_irqsave(&uap->port.lock, flags);
+        lcr_h = readb(uap->port.membase + UART010_LCRH);
+        if (break_state == -1)
+                lcr_h |= UART01x_LCRH_BRK;
+        else
+                lcr_h &= ~UART01x_LCRH_BRK;
+        writel(lcr_h, uap->port.membase + UART010_LCRH);
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+}
+
+static int pl010_startup(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        int retval;
+
+        /*
+         * Try to enable the clock producer.
+         */
+        retval = clk_enable(uap->clk);
+        if (retval)
+                goto out;
+
+        uap->port.uartclk = clk_get_rate(uap->clk);
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap);
+        if (retval)
+                goto clk_dis;
+
+        /*
+         * initialise the old status of the modem signals
+         */
+        uap->old_status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+
+        /*
+         * Finally, enable interrupts
+         */
+        writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE,
+               uap->port.membase + UART010_CR);
+
+        return 0;
+
+ clk_dis:
+        clk_disable(uap->clk);
+ out:
+        return retval;
+}
+
+static void pl010_shutdown(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        /*
+         * Free the interrupt
+         */
+        free_irq(uap->port.irq, uap);
+
+        /*
+         * disable all interrupts, disable the port
+         */
+        writel(0, uap->port.membase + UART010_CR);
+
+        /* disable break condition and fifos */
+        writel(readb(uap->port.membase + UART010_LCRH) &
+                ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN),
+               uap->port.membase + UART010_LCRH);
+
+        /*
+         * Shut down the clock producer
+         */
+        clk_disable(uap->clk);
+}
+
+static void
+pl010_set_termios(struct uart_port *port, struct ktermios *termios,
+                     struct ktermios *old)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int lcr_h, old_cr;
+        unsigned long flags;
+        unsigned int baud, quot;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, uap->port.uartclk/16); 
+        quot = uart_get_divisor(port, baud);
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                lcr_h = UART01x_LCRH_WLEN_5;
+                break;
+        case CS6:
+                lcr_h = UART01x_LCRH_WLEN_6;
+                break;
+        case CS7:
+                lcr_h = UART01x_LCRH_WLEN_7;
+                break;
+        default: // CS8
+                lcr_h = UART01x_LCRH_WLEN_8;
+                break;
+        }
+        if (termios->c_cflag & CSTOPB)
+                lcr_h |= UART01x_LCRH_STP2;
+        if (termios->c_cflag & PARENB) {
+                lcr_h |= UART01x_LCRH_PEN;
+                if (!(termios->c_cflag & PARODD))
+                        lcr_h |= UART01x_LCRH_EPS;
+        }
+        if (uap->port.fifosize > 1)
+                lcr_h |= UART01x_LCRH_FEN;
+
+        spin_lock_irqsave(&uap->port.lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        uap->port.read_status_mask = UART01x_RSR_OE;
+        if (termios->c_iflag & INPCK)
+                uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                uap->port.read_status_mask |= UART01x_RSR_BE;
+
+        /*
+         * Characters to ignore
+         */
+        uap->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
+        if (termios->c_iflag & IGNBRK) {
+                uap->port.ignore_status_mask |= UART01x_RSR_BE;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        uap->port.ignore_status_mask |= UART01x_RSR_OE;
+        }
+
+        /*
+         * Ignore all characters if CREAD is not set.
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX;
+
+        /* first, disable everything */
+        old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE;
+
+        if (UART_ENABLE_MS(port, termios->c_cflag))
+                old_cr |= UART010_CR_MSIE;
+
+        writel(0, uap->port.membase + UART010_CR);
+
+        /* Set baud rate */
+        quot -= 1;
+        writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM);
+        writel(quot & 0xff, uap->port.membase + UART010_LCRL);
+
+        /*
+         * ----------v----------v----------v----------v-----
+         * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
+         * ----------^----------^----------^----------^-----
+         */
+        writel(lcr_h, uap->port.membase + UART010_LCRH);
+        writel(old_cr, uap->port.membase + UART010_CR);
+
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+}
+
+static void pl010_set_ldisc(struct uart_port *port, int new)
+{
+        if (new == N_PPS) {
+                port->flags |= UPF_HARDPPS_CD;
+                pl010_enable_ms(port);
+        } else
+                port->flags &= ~UPF_HARDPPS_CD;
+}
+
+static const char *pl010_type(struct uart_port *port)
+{
+        return port->type == PORT_AMBA ? "AMBA" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'
+ */
+static void pl010_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, UART_PORT_SIZE);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'
+ */
+static int pl010_request_port(struct uart_port *port)
+{
+        return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
+                        != NULL ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void pl010_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_AMBA;
+                pl010_request_port(port);
+        }
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
+                ret = -EINVAL;
+        if (ser->irq < 0 || ser->irq >= nr_irqs)
+                ret = -EINVAL;
+        if (ser->baud_base < 9600)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops amba_pl010_pops = {
+        .tx_empty       = pl010_tx_empty,
+        .set_mctrl      = pl010_set_mctrl,
+        .get_mctrl      = pl010_get_mctrl,
+        .stop_tx        = pl010_stop_tx,
+        .start_tx       = pl010_start_tx,
+        .stop_rx        = pl010_stop_rx,
+        .enable_ms      = pl010_enable_ms,
+        .break_ctl      = pl010_break_ctl,
+        .startup        = pl010_startup,
+        .shutdown       = pl010_shutdown,
+        .set_termios    = pl010_set_termios,
+        .set_ldisc      = pl010_set_ldisc,
+        .type           = pl010_type,
+        .release_port   = pl010_release_port,
+        .request_port   = pl010_request_port,
+        .config_port    = pl010_config_port,
+        .verify_port    = pl010_verify_port,
+};
+
+static struct uart_amba_port *amba_ports[UART_NR];
+
+#ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
+
+static void pl010_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int status;
+
+        do {
+                status = readb(uap->port.membase + UART01x_FR);
+                barrier();
+        } while (!UART_TX_READY(status));
+        writel(ch, uap->port.membase + UART01x_DR);
+}
+
+static void
+pl010_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_amba_port *uap = amba_ports[co->index];
+        unsigned int status, old_cr;
+
+        clk_enable(uap->clk);
+
+        /*
+         *      First save the CR then disable the interrupts
+         */
+        old_cr = readb(uap->port.membase + UART010_CR);
+        writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR);
+
+        uart_console_write(&uap->port, s, count, pl010_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the TCR
+         */
+        do {
+                status = readb(uap->port.membase + UART01x_FR);
+                barrier();
+        } while (status & UART01x_FR_BUSY);
+        writel(old_cr, uap->port.membase + UART010_CR);
+
+        clk_disable(uap->clk);
+}
+
+static void __init
+pl010_console_get_options(struct uart_amba_port *uap, int *baud,
+                             int *parity, int *bits)
+{
+        if (readb(uap->port.membase + UART010_CR) & UART01x_CR_UARTEN) {
+                unsigned int lcr_h, quot;
+                lcr_h = readb(uap->port.membase + UART010_LCRH);
+
+                *parity = 'n';
+                if (lcr_h & UART01x_LCRH_PEN) {
+                        if (lcr_h & UART01x_LCRH_EPS)
+                                *parity = 'e';
+                        else
+                                *parity = 'o';
+                }
+
+                if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
+                        *bits = 7;
+                else
+                        *bits = 8;
+
+                quot = readb(uap->port.membase + UART010_LCRL) |
+                       readb(uap->port.membase + UART010_LCRM) << 8;
+                *baud = uap->port.uartclk / (16 * (quot + 1));
+        }
+}
+
+static int __init pl010_console_setup(struct console *co, char *options)
+{
+        struct uart_amba_port *uap;
+        int baud = 38400;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= UART_NR)
+                co->index = 0;
+        uap = amba_ports[co->index];
+        if (!uap)
+                return -ENODEV;
+
+        uap->port.uartclk = clk_get_rate(uap->clk);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                pl010_console_get_options(uap, &baud, &parity, &bits);
+
+        return uart_set_options(&uap->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver amba_reg;
+static struct console amba_console = {
+        .name           = "ttyAM",
+        .write          = pl010_console_write,
+        .device         = uart_console_device,
+        .setup          = pl010_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &amba_reg,
+};
+
+#define AMBA_CONSOLE    &amba_console
+#else
+#define AMBA_CONSOLE    NULL
+#endif
+
+static struct uart_driver amba_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "ttyAM",
+        .dev_name               = "ttyAM",
+        .major                  = SERIAL_AMBA_MAJOR,
+        .minor                  = SERIAL_AMBA_MINOR,
+        .nr                     = UART_NR,
+        .cons                   = AMBA_CONSOLE,
+};
+
+static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
+{
+        struct uart_amba_port *uap;
+        void __iomem *base;
+        int i, ret;
+
+        for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
+                if (amba_ports[i] == NULL)
+                        break;
+
+        if (i == ARRAY_SIZE(amba_ports)) {
+                ret = -EBUSY;
+                goto out;
+        }
+
+        uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
+        if (!uap) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        base = ioremap(dev->res.start, resource_size(&dev->res));
+        if (!base) {
+                ret = -ENOMEM;
+                goto free;
+        }
+
+        uap->clk = clk_get(&dev->dev, NULL);
+        if (IS_ERR(uap->clk)) {
+                ret = PTR_ERR(uap->clk);
+                goto unmap;
+        }
+
+        uap->port.dev = &dev->dev;
+        uap->port.mapbase = dev->res.start;
+        uap->port.membase = base;
+        uap->port.iotype = UPIO_MEM;
+        uap->port.irq = dev->irq[0];
+        uap->port.fifosize = 16;
+        uap->port.ops = &amba_pl010_pops;
+        uap->port.flags = UPF_BOOT_AUTOCONF;
+        uap->port.line = i;
+        uap->dev = dev;
+        uap->data = dev->dev.platform_data;
+
+        amba_ports[i] = uap;
+
+        amba_set_drvdata(dev, uap);
+        ret = uart_add_one_port(&amba_reg, &uap->port);
+        if (ret) {
+                amba_set_drvdata(dev, NULL);
+                amba_ports[i] = NULL;
+                clk_put(uap->clk);
+ unmap:
+                iounmap(base);
+ free:
+                kfree(uap);
+        }
+ out:
+        return ret;
+}
+
+static int pl010_remove(struct amba_device *dev)
+{
+        struct uart_amba_port *uap = amba_get_drvdata(dev);
+        int i;
+
+        amba_set_drvdata(dev, NULL);
+
+        uart_remove_one_port(&amba_reg, &uap->port);
+
+        for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
+                if (amba_ports[i] == uap)
+                        amba_ports[i] = NULL;
+
+        iounmap(uap->port.membase);
+        clk_put(uap->clk);
+        kfree(uap);
+        return 0;
+}
+
+static int pl010_suspend(struct amba_device *dev, pm_message_t state)
+{
+        struct uart_amba_port *uap = amba_get_drvdata(dev);
+
+        if (uap)
+                uart_suspend_port(&amba_reg, &uap->port);
+
+        return 0;
+}
+
+static int pl010_resume(struct amba_device *dev)
+{
+        struct uart_amba_port *uap = amba_get_drvdata(dev);
+
+        if (uap)
+                uart_resume_port(&amba_reg, &uap->port);
+
+        return 0;
+}
+
+static struct amba_id pl010_ids[] = {
+        {
+                .id     = 0x00041010,
+                .mask   = 0x000fffff,
+        },
+        { 0, 0 },
+};
+
+static struct amba_driver pl010_driver = {
+        .drv = {
+                .name   = "uart-pl010",
+        },
+        .id_table       = pl010_ids,
+        .probe          = pl010_probe,
+        .remove         = pl010_remove,
+        .suspend        = pl010_suspend,
+        .resume         = pl010_resume,
+};
+
+static int __init pl010_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: AMBA driver\n");
+
+        ret = uart_register_driver(&amba_reg);
+        if (ret == 0) {
+                ret = amba_driver_register(&pl010_driver);
+                if (ret)
+                        uart_unregister_driver(&amba_reg);
+        }
+        return ret;
+}
+
+static void __exit pl010_exit(void)
+{
+        amba_driver_unregister(&pl010_driver);
+        uart_unregister_driver(&amba_reg);
+}
+
+module_init(pl010_init);
+module_exit(pl010_exit);
+
+MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
+MODULE_DESCRIPTION("ARM AMBA serial port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
new file mode 100644
index 000000000000..f5f6831b0a64
--- /dev/null
+++ b/drivers/tty/serial/amba-pl011.c
@@ -0,0 +1,2027 @@
+/*
+ *  Driver for AMBA serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright 1999 ARM Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *  Copyright (C) 2010 ST-Ericsson SA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This is a generic driver for ARM AMBA-type serial ports.  They
+ * have a lot of 16550-like features, but are not register compatible.
+ * Note that although they do have CTS, DCD and DSR inputs, they do
+ * not have an RI input, nor do they have DTR or RTS outputs.  If
+ * required, these have to be supplied via some other means (eg, GPIO)
+ * and hooked into this driver.
+ */
+
+#if defined(CONFIG_SERIAL_AMBA_PL011_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/amba/bus.h>
+#include <linux/amba/serial.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/sizes.h>
+
+#define UART_NR                 14
+
+#define SERIAL_AMBA_MAJOR       204
+#define SERIAL_AMBA_MINOR       64
+#define SERIAL_AMBA_NR          UART_NR
+
+#define AMBA_ISR_PASS_LIMIT     256
+
+#define UART_DR_ERROR           (UART011_DR_OE|UART011_DR_BE|UART011_DR_PE|UART011_DR_FE)
+#define UART_DUMMY_DR_RX        (1 << 16)
+
+
+#define UART_WA_SAVE_NR 14
+
+static void pl011_lockup_wa(unsigned long data);
+static const u32 uart_wa_reg[UART_WA_SAVE_NR] = {
+        ST_UART011_DMAWM,
+        ST_UART011_TIMEOUT,
+        ST_UART011_LCRH_RX,
+        UART011_IBRD,
+        UART011_FBRD,
+        ST_UART011_LCRH_TX,
+        UART011_IFLS,
+        ST_UART011_XFCR,
+        ST_UART011_XON1,
+        ST_UART011_XON2,
+        ST_UART011_XOFF1,
+        ST_UART011_XOFF2,
+        UART011_CR,
+        UART011_IMSC
+};
+
+static u32 uart_wa_regdata[UART_WA_SAVE_NR];
+static DECLARE_TASKLET(pl011_lockup_tlet, pl011_lockup_wa, 0);
+
+/* There is by now at least one vendor with differing details, so handle it */
+struct vendor_data {
+        unsigned int            ifls;
+        unsigned int            fifosize;
+        unsigned int            lcrh_tx;
+        unsigned int            lcrh_rx;
+        bool                    oversampling;
+        bool                    interrupt_may_hang;   /* vendor-specific */
+        bool                    dma_threshold;
+};
+
+static struct vendor_data vendor_arm = {
+        .ifls                   = UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
+        .fifosize               = 16,
+        .lcrh_tx                = UART011_LCRH,
+        .lcrh_rx                = UART011_LCRH,
+        .oversampling           = false,
+        .dma_threshold          = false,
+};
+
+static struct vendor_data vendor_st = {
+        .ifls                   = UART011_IFLS_RX_HALF|UART011_IFLS_TX_HALF,
+        .fifosize               = 64,
+        .lcrh_tx                = ST_UART011_LCRH_TX,
+        .lcrh_rx                = ST_UART011_LCRH_RX,
+        .oversampling           = true,
+        .interrupt_may_hang     = true,
+        .dma_threshold          = true,
+};
+
+static struct uart_amba_port *amba_ports[UART_NR];
+
+/* Deals with DMA transactions */
+
+struct pl011_sgbuf {
+        struct scatterlist sg;
+        char *buf;
+};
+
+struct pl011_dmarx_data {
+        struct dma_chan         *chan;
+        struct completion       complete;
+        bool                    use_buf_b;
+        struct pl011_sgbuf      sgbuf_a;
+        struct pl011_sgbuf      sgbuf_b;
+        dma_cookie_t            cookie;
+        bool                    running;
+};
+
+struct pl011_dmatx_data {
+        struct dma_chan         *chan;
+        struct scatterlist      sg;
+        char                    *buf;
+        bool                    queued;
+};
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct uart_amba_port {
+        struct uart_port        port;
+        struct clk              *clk;
+        const struct vendor_data *vendor;
+        unsigned int            dmacr;          /* dma control reg */
+        unsigned int            im;             /* interrupt mask */
+        unsigned int            old_status;
+        unsigned int            fifosize;       /* vendor-specific */
+        unsigned int            lcrh_tx;        /* vendor-specific */
+        unsigned int            lcrh_rx;        /* vendor-specific */
+        bool                    autorts;
+        char                    type[12];
+        bool                    interrupt_may_hang; /* vendor-specific */
+#ifdef CONFIG_DMA_ENGINE
+        /* DMA stuff */
+        bool                    using_tx_dma;
+        bool                    using_rx_dma;
+        struct pl011_dmarx_data dmarx;
+        struct pl011_dmatx_data dmatx;
+#endif
+};
+
+/*
+ * Reads up to 256 characters from the FIFO or until it's empty and
+ * inserts them into the TTY layer. Returns the number of characters
+ * read from the FIFO.
+ */
+static int pl011_fifo_to_tty(struct uart_amba_port *uap)
+{
+        u16 status, ch;
+        unsigned int flag, max_count = 256;
+        int fifotaken = 0;
+
+        while (max_count--) {
+                status = readw(uap->port.membase + UART01x_FR);
+                if (status & UART01x_FR_RXFE)
+                        break;
+
+                /* Take chars from the FIFO and update status */
+                ch = readw(uap->port.membase + UART01x_DR) |
+                        UART_DUMMY_DR_RX;
+                flag = TTY_NORMAL;
+                uap->port.icount.rx++;
+                fifotaken++;
+
+                if (unlikely(ch & UART_DR_ERROR)) {
+                        if (ch & UART011_DR_BE) {
+                                ch &= ~(UART011_DR_FE | UART011_DR_PE);
+                                uap->port.icount.brk++;
+                                if (uart_handle_break(&uap->port))
+                                        continue;
+                        } else if (ch & UART011_DR_PE)
+                                uap->port.icount.parity++;
+                        else if (ch & UART011_DR_FE)
+                                uap->port.icount.frame++;
+                        if (ch & UART011_DR_OE)
+                                uap->port.icount.overrun++;
+
+                        ch &= uap->port.read_status_mask;
+
+                        if (ch & UART011_DR_BE)
+                                flag = TTY_BREAK;
+                        else if (ch & UART011_DR_PE)
+                                flag = TTY_PARITY;
+                        else if (ch & UART011_DR_FE)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(&uap->port, ch & 255))
+                        continue;
+
+                uart_insert_char(&uap->port, ch, UART011_DR_OE, ch, flag);
+        }
+
+        return fifotaken;
+}
+
+
+/*
+ * All the DMA operation mode stuff goes inside this ifdef.
+ * This assumes that you have a generic DMA device interface,
+ * no custom DMA interfaces are supported.
+ */
+#ifdef CONFIG_DMA_ENGINE
+
+#define PL011_DMA_BUFFER_SIZE PAGE_SIZE
+
+static int pl011_sgbuf_init(struct dma_chan *chan, struct pl011_sgbuf *sg,
+        enum dma_data_direction dir)
+{
+        sg->buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL);
+        if (!sg->buf)
+                return -ENOMEM;
+
+        sg_init_one(&sg->sg, sg->buf, PL011_DMA_BUFFER_SIZE);
+
+        if (dma_map_sg(chan->device->dev, &sg->sg, 1, dir) != 1) {
+                kfree(sg->buf);
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static void pl011_sgbuf_free(struct dma_chan *chan, struct pl011_sgbuf *sg,
+        enum dma_data_direction dir)
+{
+        if (sg->buf) {
+                dma_unmap_sg(chan->device->dev, &sg->sg, 1, dir);
+                kfree(sg->buf);
+        }
+}
+
+static void pl011_dma_probe_initcall(struct uart_amba_port *uap)
+{
+        /* DMA is the sole user of the platform data right now */
+        struct amba_pl011_data *plat = uap->port.dev->platform_data;
+        struct dma_slave_config tx_conf = {
+                .dst_addr = uap->port.mapbase + UART01x_DR,
+                .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+                .direction = DMA_TO_DEVICE,
+                .dst_maxburst = uap->fifosize >> 1,
+        };
+        struct dma_chan *chan;
+        dma_cap_mask_t mask;
+
+        /* We need platform data */
+        if (!plat || !plat->dma_filter) {
+                dev_info(uap->port.dev, "no DMA platform data\n");
+                return;
+        }
+
+        /* Try to acquire a generic DMA engine slave TX channel */
+        dma_cap_zero(mask);
+        dma_cap_set(DMA_SLAVE, mask);
+
+        chan = dma_request_channel(mask, plat->dma_filter, plat->dma_tx_param);
+        if (!chan) {
+                dev_err(uap->port.dev, "no TX DMA channel!\n");
+                return;
+        }
+
+        dmaengine_slave_config(chan, &tx_conf);
+        uap->dmatx.chan = chan;
+
+        dev_info(uap->port.dev, "DMA channel TX %s\n",
+                 dma_chan_name(uap->dmatx.chan));
+
+        /* Optionally make use of an RX channel as well */
+        if (plat->dma_rx_param) {
+                struct dma_slave_config rx_conf = {
+                        .src_addr = uap->port.mapbase + UART01x_DR,
+                        .src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,
+                        .direction = DMA_FROM_DEVICE,
+                        .src_maxburst = uap->fifosize >> 1,
+                };
+
+                chan = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param);
+                if (!chan) {
+                        dev_err(uap->port.dev, "no RX DMA channel!\n");
+                        return;
+                }
+
+                dmaengine_slave_config(chan, &rx_conf);
+                uap->dmarx.chan = chan;
+
+                dev_info(uap->port.dev, "DMA channel RX %s\n",
+                         dma_chan_name(uap->dmarx.chan));
+        }
+}
+
+#ifndef MODULE
+/*
+ * Stack up the UARTs and let the above initcall be done at device
+ * initcall time, because the serial driver is called as an arch
+ * initcall, and at this time the DMA subsystem is not yet registered.
+ * At this point the driver will switch over to using DMA where desired.
+ */
+struct dma_uap {
+        struct list_head node;
+        struct uart_amba_port *uap;
+};
+
+static LIST_HEAD(pl011_dma_uarts);
+
+static int __init pl011_dma_initcall(void)
+{
+        struct list_head *node, *tmp;
+
+        list_for_each_safe(node, tmp, &pl011_dma_uarts) {
+                struct dma_uap *dmau = list_entry(node, struct dma_uap, node);
+                pl011_dma_probe_initcall(dmau->uap);
+                list_del(node);
+                kfree(dmau);
+        }
+        return 0;
+}
+
+device_initcall(pl011_dma_initcall);
+
+static void pl011_dma_probe(struct uart_amba_port *uap)
+{
+        struct dma_uap *dmau = kzalloc(sizeof(struct dma_uap), GFP_KERNEL);
+        if (dmau) {
+                dmau->uap = uap;
+                list_add_tail(&dmau->node, &pl011_dma_uarts);
+        }
+}
+#else
+static void pl011_dma_probe(struct uart_amba_port *uap)
+{
+        pl011_dma_probe_initcall(uap);
+}
+#endif
+
+static void pl011_dma_remove(struct uart_amba_port *uap)
+{
+        /* TODO: remove the initcall if it has not yet executed */
+        if (uap->dmatx.chan)
+                dma_release_channel(uap->dmatx.chan);
+        if (uap->dmarx.chan)
+                dma_release_channel(uap->dmarx.chan);
+}
+
+/* Forward declare this for the refill routine */
+static int pl011_dma_tx_refill(struct uart_amba_port *uap);
+
+/*
+ * The current DMA TX buffer has been sent.
+ * Try to queue up another DMA buffer.
+ */
+static void pl011_dma_tx_callback(void *data)
+{
+        struct uart_amba_port *uap = data;
+        struct pl011_dmatx_data *dmatx = &uap->dmatx;
+        unsigned long flags;
+        u16 dmacr;
+
+        spin_lock_irqsave(&uap->port.lock, flags);
+        if (uap->dmatx.queued)
+                dma_unmap_sg(dmatx->chan->device->dev, &dmatx->sg, 1,
+                             DMA_TO_DEVICE);
+
+        dmacr = uap->dmacr;
+        uap->dmacr = dmacr & ~UART011_TXDMAE;
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+
+        /*
+         * If TX DMA was disabled, it means that we've stopped the DMA for
+         * some reason (eg, XOFF received, or we want to send an X-char.)
+         *
+         * Note: we need to be careful here of a potential race between DMA
+         * and the rest of the driver - if the driver disables TX DMA while
+         * a TX buffer completing, we must update the tx queued status to
+         * get further refills (hence we check dmacr).
+         */
+        if (!(dmacr & UART011_TXDMAE) || uart_tx_stopped(&uap->port) ||
+            uart_circ_empty(&uap->port.state->xmit)) {
+                uap->dmatx.queued = false;
+                spin_unlock_irqrestore(&uap->port.lock, flags);
+                return;
+        }
+
+        if (pl011_dma_tx_refill(uap) <= 0) {
+                /*
+                 * We didn't queue a DMA buffer for some reason, but we
+                 * have data pending to be sent.  Re-enable the TX IRQ.
+                 */
+                uap->im |= UART011_TXIM;
+                writew(uap->im, uap->port.membase + UART011_IMSC);
+        }
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+}
+
+/*
+ * Try to refill the TX DMA buffer.
+ * Locking: called with port lock held and IRQs disabled.
+ * Returns:
+ *   1 if we queued up a TX DMA buffer.
+ *   0 if we didn't want to handle this by DMA
+ *  <0 on error
+ */
+static int pl011_dma_tx_refill(struct uart_amba_port *uap)
+{
+        struct pl011_dmatx_data *dmatx = &uap->dmatx;
+        struct dma_chan *chan = dmatx->chan;
+        struct dma_device *dma_dev = chan->device;
+        struct dma_async_tx_descriptor *desc;
+        struct circ_buf *xmit = &uap->port.state->xmit;
+        unsigned int count;
+
+        /*
+         * Try to avoid the overhead involved in using DMA if the
+         * transaction fits in the first half of the FIFO, by using
+         * the standard interrupt handling.  This ensures that we
+         * issue a uart_write_wakeup() at the appropriate time.
+         */
+        count = uart_circ_chars_pending(xmit);
+        if (count < (uap->fifosize >> 1)) {
+                uap->dmatx.queued = false;
+                return 0;
+        }
+
+        /*
+         * Bodge: don't send the last character by DMA, as this
+         * will prevent XON from notifying us to restart DMA.
+         */
+        count -= 1;
+
+        /* Else proceed to copy the TX chars to the DMA buffer and fire DMA */
+        if (count > PL011_DMA_BUFFER_SIZE)
+                count = PL011_DMA_BUFFER_SIZE;
+
+        if (xmit->tail < xmit->head)
+                memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], count);
+        else {
+                size_t first = UART_XMIT_SIZE - xmit->tail;
+                size_t second = xmit->head;
+
+                memcpy(&dmatx->buf[0], &xmit->buf[xmit->tail], first);
+                if (second)
+                        memcpy(&dmatx->buf[first], &xmit->buf[0], second);
+        }
+
+        dmatx->sg.length = count;
+
+        if (dma_map_sg(dma_dev->dev, &dmatx->sg, 1, DMA_TO_DEVICE) != 1) {
+                uap->dmatx.queued = false;
+                dev_dbg(uap->port.dev, "unable to map TX DMA\n");
+                return -EBUSY;
+        }
+
+        desc = dma_dev->device_prep_slave_sg(chan, &dmatx->sg, 1, DMA_TO_DEVICE,
+                                             DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+        if (!desc) {
+                dma_unmap_sg(dma_dev->dev, &dmatx->sg, 1, DMA_TO_DEVICE);
+                uap->dmatx.queued = false;
+                /*
+                 * If DMA cannot be used right now, we complete this
+                 * transaction via IRQ and let the TTY layer retry.
+                 */
+                dev_dbg(uap->port.dev, "TX DMA busy\n");
+                return -EBUSY;
+        }
+
+        /* Some data to go along to the callback */
+        desc->callback = pl011_dma_tx_callback;
+        desc->callback_param = uap;
+
+        /* All errors should happen at prepare time */
+        dmaengine_submit(desc);
+
+        /* Fire the DMA transaction */
+        dma_dev->device_issue_pending(chan);
+
+        uap->dmacr |= UART011_TXDMAE;
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+        uap->dmatx.queued = true;
+
+        /*
+         * Now we know that DMA will fire, so advance the ring buffer
+         * with the stuff we just dispatched.
+         */
+        xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
+        uap->port.icount.tx += count;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&uap->port);
+
+        return 1;
+}
+
+/*
+ * We received a transmit interrupt without a pending X-char but with
+ * pending characters.
+ * Locking: called with port lock held and IRQs disabled.
+ * Returns:
+ *   false if we want to use PIO to transmit
+ *   true if we queued a DMA buffer
+ */
+static bool pl011_dma_tx_irq(struct uart_amba_port *uap)
+{
+        if (!uap->using_tx_dma)
+                return false;
+
+        /*
+         * If we already have a TX buffer queued, but received a
+         * TX interrupt, it will be because we've just sent an X-char.
+         * Ensure the TX DMA is enabled and the TX IRQ is disabled.
+         */
+        if (uap->dmatx.queued) {
+                uap->dmacr |= UART011_TXDMAE;
+                writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+                uap->im &= ~UART011_TXIM;
+                writew(uap->im, uap->port.membase + UART011_IMSC);
+                return true;
+        }
+
+        /*
+         * We don't have a TX buffer queued, so try to queue one.
+         * If we successfully queued a buffer, mask the TX IRQ.
+         */
+        if (pl011_dma_tx_refill(uap) > 0) {
+                uap->im &= ~UART011_TXIM;
+                writew(uap->im, uap->port.membase + UART011_IMSC);
+                return true;
+        }
+        return false;
+}
+
+/*
+ * Stop the DMA transmit (eg, due to received XOFF).
+ * Locking: called with port lock held and IRQs disabled.
+ */
+static inline void pl011_dma_tx_stop(struct uart_amba_port *uap)
+{
+        if (uap->dmatx.queued) {
+                uap->dmacr &= ~UART011_TXDMAE;
+                writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+        }
+}
+
+/*
+ * Try to start a DMA transmit, or in the case of an XON/OFF
+ * character queued for send, try to get that character out ASAP.
+ * Locking: called with port lock held and IRQs disabled.
+ * Returns:
+ *   false if we want the TX IRQ to be enabled
+ *   true if we have a buffer queued
+ */
+static inline bool pl011_dma_tx_start(struct uart_amba_port *uap)
+{
+        u16 dmacr;
+
+        if (!uap->using_tx_dma)
+                return false;
+
+        if (!uap->port.x_char) {
+                /* no X-char, try to push chars out in DMA mode */
+                bool ret = true;
+
+                if (!uap->dmatx.queued) {
+                        if (pl011_dma_tx_refill(uap) > 0) {
+                                uap->im &= ~UART011_TXIM;
+                                ret = true;
+                        } else {
+                                uap->im |= UART011_TXIM;
+                                ret = false;
+                        }
+                        writew(uap->im, uap->port.membase + UART011_IMSC);
+                } else if (!(uap->dmacr & UART011_TXDMAE)) {
+                        uap->dmacr |= UART011_TXDMAE;
+                        writew(uap->dmacr,
+                                       uap->port.membase + UART011_DMACR);
+                }
+                return ret;
+        }
+
+        /*
+         * We have an X-char to send.  Disable DMA to prevent it loading
+         * the TX fifo, and then see if we can stuff it into the FIFO.
+         */
+        dmacr = uap->dmacr;
+        uap->dmacr &= ~UART011_TXDMAE;
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+
+        if (readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF) {
+                /*
+                 * No space in the FIFO, so enable the transmit interrupt
+                 * so we know when there is space.  Note that once we've
+                 * loaded the character, we should just re-enable DMA.
+                 */
+                return false;
+        }
+
+        writew(uap->port.x_char, uap->port.membase + UART01x_DR);
+        uap->port.icount.tx++;
+        uap->port.x_char = 0;
+
+        /* Success - restore the DMA state */
+        uap->dmacr = dmacr;
+        writew(dmacr, uap->port.membase + UART011_DMACR);
+
+        return true;
+}
+
+/*
+ * Flush the transmit buffer.
+ * Locking: called with port lock held and IRQs disabled.
+ */
+static void pl011_dma_flush_buffer(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        if (!uap->using_tx_dma)
+                return;
+
+        /* Avoid deadlock with the DMA engine callback */
+        spin_unlock(&uap->port.lock);
+        dmaengine_terminate_all(uap->dmatx.chan);
+        spin_lock(&uap->port.lock);
+        if (uap->dmatx.queued) {
+                dma_unmap_sg(uap->dmatx.chan->device->dev, &uap->dmatx.sg, 1,
+                             DMA_TO_DEVICE);
+                uap->dmatx.queued = false;
+                uap->dmacr &= ~UART011_TXDMAE;
+                writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+        }
+}
+
+static void pl011_dma_rx_callback(void *data);
+
+static int pl011_dma_rx_trigger_dma(struct uart_amba_port *uap)
+{
+        struct dma_chan *rxchan = uap->dmarx.chan;
+        struct dma_device *dma_dev;
+        struct pl011_dmarx_data *dmarx = &uap->dmarx;
+        struct dma_async_tx_descriptor *desc;
+        struct pl011_sgbuf *sgbuf;
+
+        if (!rxchan)
+                return -EIO;
+
+        /* Start the RX DMA job */
+        sgbuf = uap->dmarx.use_buf_b ?
+                &uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a;
+        dma_dev = rxchan->device;
+        desc = rxchan->device->device_prep_slave_sg(rxchan, &sgbuf->sg, 1,
+                                        DMA_FROM_DEVICE,
+                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+        /*
+         * If the DMA engine is busy and cannot prepare a
+         * channel, no big deal, the driver will fall back
+         * to interrupt mode as a result of this error code.
+         */
+        if (!desc) {
+                uap->dmarx.running = false;
+                dmaengine_terminate_all(rxchan);
+                return -EBUSY;
+        }
+
+        /* Some data to go along to the callback */
+        desc->callback = pl011_dma_rx_callback;
+        desc->callback_param = uap;
+        dmarx->cookie = dmaengine_submit(desc);
+        dma_async_issue_pending(rxchan);
+
+        uap->dmacr |= UART011_RXDMAE;
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+        uap->dmarx.running = true;
+
+        uap->im &= ~UART011_RXIM;
+        writew(uap->im, uap->port.membase + UART011_IMSC);
+
+        return 0;
+}
+
+/*
+ * This is called when either the DMA job is complete, or
+ * the FIFO timeout interrupt occurred. This must be called
+ * with the port spinlock uap->port.lock held.
+ */
+static void pl011_dma_rx_chars(struct uart_amba_port *uap,
+                               u32 pending, bool use_buf_b,
+                               bool readfifo)
+{
+        struct tty_struct *tty = uap->port.state->port.tty;
+        struct pl011_sgbuf *sgbuf = use_buf_b ?
+                &uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a;
+        struct device *dev = uap->dmarx.chan->device->dev;
+        int dma_count = 0;
+        u32 fifotaken = 0; /* only used for vdbg() */
+
+        /* Pick everything from the DMA first */
+        if (pending) {
+                /* Sync in buffer */
+                dma_sync_sg_for_cpu(dev, &sgbuf->sg, 1, DMA_FROM_DEVICE);
+
+                /*
+                 * First take all chars in the DMA pipe, then look in the FIFO.
+                 * Note that tty_insert_flip_buf() tries to take as many chars
+                 * as it can.
+                 */
+                dma_count = tty_insert_flip_string(uap->port.state->port.tty,
+                                                   sgbuf->buf, pending);
+
+                /* Return buffer to device */
+                dma_sync_sg_for_device(dev, &sgbuf->sg, 1, DMA_FROM_DEVICE);
+
+                uap->port.icount.rx += dma_count;
+                if (dma_count < pending)
+                        dev_warn(uap->port.dev,
+                                 "couldn't insert all characters (TTY is full?)\n");
+        }
+
+        /*
+         * Only continue with trying to read the FIFO if all DMA chars have
+         * been taken first.
+         */
+        if (dma_count == pending && readfifo) {
+                /* Clear any error flags */
+                writew(UART011_OEIS | UART011_BEIS | UART011_PEIS | UART011_FEIS,
+                       uap->port.membase + UART011_ICR);
+
+                /*
+                 * If we read all the DMA'd characters, and we had an
+                 * incomplete buffer, that could be due to an rx error, or
+                 * maybe we just timed out. Read any pending chars and check
+                 * the error status.
+                 *
+                 * Error conditions will only occur in the FIFO, these will
+                 * trigger an immediate interrupt and stop the DMA job, so we
+                 * will always find the error in the FIFO, never in the DMA
+                 * buffer.
+                 */
+                fifotaken = pl011_fifo_to_tty(uap);
+        }
+
+        spin_unlock(&uap->port.lock);
+        dev_vdbg(uap->port.dev,
+                 "Took %d chars from DMA buffer and %d chars from the FIFO\n",
+                 dma_count, fifotaken);
+        tty_flip_buffer_push(tty);
+        spin_lock(&uap->port.lock);
+}
+
+static void pl011_dma_rx_irq(struct uart_amba_port *uap)
+{
+        struct pl011_dmarx_data *dmarx = &uap->dmarx;
+        struct dma_chan *rxchan = dmarx->chan;
+        struct pl011_sgbuf *sgbuf = dmarx->use_buf_b ?
+                &dmarx->sgbuf_b : &dmarx->sgbuf_a;
+        size_t pending;
+        struct dma_tx_state state;
+        enum dma_status dmastat;
+
+        /*
+         * Pause the transfer so we can trust the current counter,
+         * do this before we pause the PL011 block, else we may
+         * overflow the FIFO.
+         */
+        if (dmaengine_pause(rxchan))
+                dev_err(uap->port.dev, "unable to pause DMA transfer\n");
+        dmastat = rxchan->device->device_tx_status(rxchan,
+                                                   dmarx->cookie, &state);
+        if (dmastat != DMA_PAUSED)
+                dev_err(uap->port.dev, "unable to pause DMA transfer\n");
+
+        /* Disable RX DMA - incoming data will wait in the FIFO */
+        uap->dmacr &= ~UART011_RXDMAE;
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+        uap->dmarx.running = false;
+
+        pending = sgbuf->sg.length - state.residue;
+        BUG_ON(pending > PL011_DMA_BUFFER_SIZE);
+        /* Then we terminate the transfer - we now know our residue */
+        dmaengine_terminate_all(rxchan);
+
+        /*
+         * This will take the chars we have so far and insert
+         * into the framework.
+         */
+        pl011_dma_rx_chars(uap, pending, dmarx->use_buf_b, true);
+
+        /* Switch buffer & re-trigger DMA job */
+        dmarx->use_buf_b = !dmarx->use_buf_b;
+        if (pl011_dma_rx_trigger_dma(uap)) {
+                dev_dbg(uap->port.dev, "could not retrigger RX DMA job "
+                        "fall back to interrupt mode\n");
+                uap->im |= UART011_RXIM;
+                writew(uap->im, uap->port.membase + UART011_IMSC);
+        }
+}
+
+static void pl011_dma_rx_callback(void *data)
+{
+        struct uart_amba_port *uap = data;
+        struct pl011_dmarx_data *dmarx = &uap->dmarx;
+        bool lastbuf = dmarx->use_buf_b;
+        int ret;
+
+        /*
+         * This completion interrupt occurs typically when the
+         * RX buffer is totally stuffed but no timeout has yet
+         * occurred. When that happens, we just want the RX
+         * routine to flush out the secondary DMA buffer while
+         * we immediately trigger the next DMA job.
+         */
+        spin_lock_irq(&uap->port.lock);
+        uap->dmarx.running = false;
+        dmarx->use_buf_b = !lastbuf;
+        ret = pl011_dma_rx_trigger_dma(uap);
+
+        pl011_dma_rx_chars(uap, PL011_DMA_BUFFER_SIZE, lastbuf, false);
+        spin_unlock_irq(&uap->port.lock);
+        /*
+         * Do this check after we picked the DMA chars so we don't
+         * get some IRQ immediately from RX.
+         */
+        if (ret) {
+                dev_dbg(uap->port.dev, "could not retrigger RX DMA job "
+                        "fall back to interrupt mode\n");
+                uap->im |= UART011_RXIM;
+                writew(uap->im, uap->port.membase + UART011_IMSC);
+        }
+}
+
+/*
+ * Stop accepting received characters, when we're shutting down or
+ * suspending this port.
+ * Locking: called with port lock held and IRQs disabled.
+ */
+static inline void pl011_dma_rx_stop(struct uart_amba_port *uap)
+{
+        /* FIXME.  Just disable the DMA enable */
+        uap->dmacr &= ~UART011_RXDMAE;
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+}
+
+static void pl011_dma_startup(struct uart_amba_port *uap)
+{
+        int ret;
+
+        if (!uap->dmatx.chan)
+                return;
+
+        uap->dmatx.buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL);
+        if (!uap->dmatx.buf) {
+                dev_err(uap->port.dev, "no memory for DMA TX buffer\n");
+                uap->port.fifosize = uap->fifosize;
+                return;
+        }
+
+        sg_init_one(&uap->dmatx.sg, uap->dmatx.buf, PL011_DMA_BUFFER_SIZE);
+
+        /* The DMA buffer is now the FIFO the TTY subsystem can use */
+        uap->port.fifosize = PL011_DMA_BUFFER_SIZE;
+        uap->using_tx_dma = true;
+
+        if (!uap->dmarx.chan)
+                goto skip_rx;
+
+        /* Allocate and map DMA RX buffers */
+        ret = pl011_sgbuf_init(uap->dmarx.chan, &uap->dmarx.sgbuf_a,
+                               DMA_FROM_DEVICE);
+        if (ret) {
+                dev_err(uap->port.dev, "failed to init DMA %s: %d\n",
+                        "RX buffer A", ret);
+                goto skip_rx;
+        }
+
+        ret = pl011_sgbuf_init(uap->dmarx.chan, &uap->dmarx.sgbuf_b,
+                               DMA_FROM_DEVICE);
+        if (ret) {
+                dev_err(uap->port.dev, "failed to init DMA %s: %d\n",
+                        "RX buffer B", ret);
+                pl011_sgbuf_free(uap->dmarx.chan, &uap->dmarx.sgbuf_a,
+                                 DMA_FROM_DEVICE);
+                goto skip_rx;
+        }
+
+        uap->using_rx_dma = true;
+
+skip_rx:
+        /* Turn on DMA error (RX/TX will be enabled on demand) */
+        uap->dmacr |= UART011_DMAONERR;
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+
+        /*
+         * ST Micro variants has some specific dma burst threshold
+         * compensation. Set this to 16 bytes, so burst will only
+         * be issued above/below 16 bytes.
+         */
+        if (uap->vendor->dma_threshold)
+                writew(ST_UART011_DMAWM_RX_16 | ST_UART011_DMAWM_TX_16,
+                               uap->port.membase + ST_UART011_DMAWM);
+
+        if (uap->using_rx_dma) {
+                if (pl011_dma_rx_trigger_dma(uap))
+                        dev_dbg(uap->port.dev, "could not trigger initial "
+                                "RX DMA job, fall back to interrupt mode\n");
+        }
+}
+
+static void pl011_dma_shutdown(struct uart_amba_port *uap)
+{
+        if (!(uap->using_tx_dma || uap->using_rx_dma))
+                return;
+
+        /* Disable RX and TX DMA */
+        while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_BUSY)
+                barrier();
+
+        spin_lock_irq(&uap->port.lock);
+        uap->dmacr &= ~(UART011_DMAONERR | UART011_RXDMAE | UART011_TXDMAE);
+        writew(uap->dmacr, uap->port.membase + UART011_DMACR);
+        spin_unlock_irq(&uap->port.lock);
+
+        if (uap->using_tx_dma) {
+                /* In theory, this should already be done by pl011_dma_flush_buffer */
+                dmaengine_terminate_all(uap->dmatx.chan);
+                if (uap->dmatx.queued) {
+                        dma_unmap_sg(uap->dmatx.chan->device->dev, &uap->dmatx.sg, 1,
+                                     DMA_TO_DEVICE);
+                        uap->dmatx.queued = false;
+                }
+
+                kfree(uap->dmatx.buf);
+                uap->using_tx_dma = false;
+        }
+
+        if (uap->using_rx_dma) {
+                dmaengine_terminate_all(uap->dmarx.chan);
+                /* Clean up the RX DMA */
+                pl011_sgbuf_free(uap->dmarx.chan, &uap->dmarx.sgbuf_a, DMA_FROM_DEVICE);
+                pl011_sgbuf_free(uap->dmarx.chan, &uap->dmarx.sgbuf_b, DMA_FROM_DEVICE);
+                uap->using_rx_dma = false;
+        }
+}
+
+static inline bool pl011_dma_rx_available(struct uart_amba_port *uap)
+{
+        return uap->using_rx_dma;
+}
+
+static inline bool pl011_dma_rx_running(struct uart_amba_port *uap)
+{
+        return uap->using_rx_dma && uap->dmarx.running;
+}
+
+
+#else
+/* Blank functions if the DMA engine is not available */
+static inline void pl011_dma_probe(struct uart_amba_port *uap)
+{
+}
+
+static inline void pl011_dma_remove(struct uart_amba_port *uap)
+{
+}
+
+static inline void pl011_dma_startup(struct uart_amba_port *uap)
+{
+}
+
+static inline void pl011_dma_shutdown(struct uart_amba_port *uap)
+{
+}
+
+static inline bool pl011_dma_tx_irq(struct uart_amba_port *uap)
+{
+        return false;
+}
+
+static inline void pl011_dma_tx_stop(struct uart_amba_port *uap)
+{
+}
+
+static inline bool pl011_dma_tx_start(struct uart_amba_port *uap)
+{
+        return false;
+}
+
+static inline void pl011_dma_rx_irq(struct uart_amba_port *uap)
+{
+}
+
+static inline void pl011_dma_rx_stop(struct uart_amba_port *uap)
+{
+}
+
+static inline int pl011_dma_rx_trigger_dma(struct uart_amba_port *uap)
+{
+        return -EIO;
+}
+
+static inline bool pl011_dma_rx_available(struct uart_amba_port *uap)
+{
+        return false;
+}
+
+static inline bool pl011_dma_rx_running(struct uart_amba_port *uap)
+{
+        return false;
+}
+
+#define pl011_dma_flush_buffer  NULL
+#endif
+
+
+/*
+ * pl011_lockup_wa
+ * This workaround aims to break the deadlock situation
+ * when after long transfer over uart in hardware flow
+ * control, uart interrupt registers cannot be cleared.
+ * Hence uart transfer gets blocked.
+ *
+ * It is seen that during such deadlock condition ICR
+ * don't get cleared even on multiple write. This leads
+ * pass_counter to decrease and finally reach zero. This
+ * can be taken as trigger point to run this UART_BT_WA.
+ *
+ */
+static void pl011_lockup_wa(unsigned long data)
+{
+        struct uart_amba_port *uap = amba_ports[0];
+        void __iomem *base = uap->port.membase;
+        struct circ_buf *xmit = &uap->port.state->xmit;
+        struct tty_struct *tty = uap->port.state->port.tty;
+        int buf_empty_retries = 200;
+        int loop;
+
+        /* Stop HCI layer from submitting data for tx */
+        tty->hw_stopped = 1;
+        while (!uart_circ_empty(xmit)) {
+                if (buf_empty_retries-- == 0)
+                        break;
+                udelay(100);
+        }
+
+        /* Backup registers */
+        for (loop = 0; loop < UART_WA_SAVE_NR; loop++)
+                uart_wa_regdata[loop] = readl(base + uart_wa_reg[loop]);
+
+        /* Disable UART so that FIFO data is flushed out */
+        writew(0x00, uap->port.membase + UART011_CR);
+
+        /* Soft reset UART module */
+        if (uap->port.dev->platform_data) {
+                struct amba_pl011_data *plat;
+
+                plat = uap->port.dev->platform_data;
+                if (plat->reset)
+                        plat->reset();
+        }
+
+        /* Restore registers */
+        for (loop = 0; loop < UART_WA_SAVE_NR; loop++)
+                writew(uart_wa_regdata[loop] ,
+                                uap->port.membase + uart_wa_reg[loop]);
+
+        /* Initialise the old status of the modem signals */
+        uap->old_status = readw(uap->port.membase + UART01x_FR) &
+                UART01x_FR_MODEM_ANY;
+
+        if (readl(base + UART011_MIS) & 0x2)
+                printk(KERN_EMERG "UART_BT_WA: ***FAILED***\n");
+
+        /* Start Tx/Rx */
+        tty->hw_stopped = 0;
+}
+
+static void pl011_stop_tx(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        uap->im &= ~UART011_TXIM;
+        writew(uap->im, uap->port.membase + UART011_IMSC);
+        pl011_dma_tx_stop(uap);
+}
+
+static void pl011_start_tx(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        if (!pl011_dma_tx_start(uap)) {
+                uap->im |= UART011_TXIM;
+                writew(uap->im, uap->port.membase + UART011_IMSC);
+        }
+}
+
+static void pl011_stop_rx(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        uap->im &= ~(UART011_RXIM|UART011_RTIM|UART011_FEIM|
+                     UART011_PEIM|UART011_BEIM|UART011_OEIM);
+        writew(uap->im, uap->port.membase + UART011_IMSC);
+
+        pl011_dma_rx_stop(uap);
+}
+
+static void pl011_enable_ms(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        uap->im |= UART011_RIMIM|UART011_CTSMIM|UART011_DCDMIM|UART011_DSRMIM;
+        writew(uap->im, uap->port.membase + UART011_IMSC);
+}
+
+static void pl011_rx_chars(struct uart_amba_port *uap)
+{
+        struct tty_struct *tty = uap->port.state->port.tty;
+
+        pl011_fifo_to_tty(uap);
+
+        spin_unlock(&uap->port.lock);
+        tty_flip_buffer_push(tty);
+        /*
+         * If we were temporarily out of DMA mode for a while,
+         * attempt to switch back to DMA mode again.
+         */
+        if (pl011_dma_rx_available(uap)) {
+                if (pl011_dma_rx_trigger_dma(uap)) {
+                        dev_dbg(uap->port.dev, "could not trigger RX DMA job "
+                                "fall back to interrupt mode again\n");
+                        uap->im |= UART011_RXIM;
+                } else
+                        uap->im &= ~UART011_RXIM;
+                writew(uap->im, uap->port.membase + UART011_IMSC);
+        }
+        spin_lock(&uap->port.lock);
+}
+
+static void pl011_tx_chars(struct uart_amba_port *uap)
+{
+        struct circ_buf *xmit = &uap->port.state->xmit;
+        int count;
+
+        if (uap->port.x_char) {
+                writew(uap->port.x_char, uap->port.membase + UART01x_DR);
+                uap->port.icount.tx++;
+                uap->port.x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
+                pl011_stop_tx(&uap->port);
+                return;
+        }
+
+        /* If we are using DMA mode, try to send some characters. */
+        if (pl011_dma_tx_irq(uap))
+                return;
+
+        count = uap->fifosize >> 1;
+        do {
+                writew(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                uap->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&uap->port);
+
+        if (uart_circ_empty(xmit))
+                pl011_stop_tx(&uap->port);
+}
+
+static void pl011_modem_status(struct uart_amba_port *uap)
+{
+        unsigned int status, delta;
+
+        status = readw(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+
+        delta = status ^ uap->old_status;
+        uap->old_status = status;
+
+        if (!delta)
+                return;
+
+        if (delta & UART01x_FR_DCD)
+                uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
+
+        if (delta & UART01x_FR_DSR)
+                uap->port.icount.dsr++;
+
+        if (delta & UART01x_FR_CTS)
+                uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
+
+        wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
+}
+
+static irqreturn_t pl011_int(int irq, void *dev_id)
+{
+        struct uart_amba_port *uap = dev_id;
+        unsigned long flags;
+        unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
+        int handled = 0;
+
+        spin_lock_irqsave(&uap->port.lock, flags);
+
+        status = readw(uap->port.membase + UART011_MIS);
+        if (status) {
+                do {
+                        writew(status & ~(UART011_TXIS|UART011_RTIS|
+                                          UART011_RXIS),
+                               uap->port.membase + UART011_ICR);
+
+                        if (status & (UART011_RTIS|UART011_RXIS)) {
+                                if (pl011_dma_rx_running(uap))
+                                        pl011_dma_rx_irq(uap);
+                                else
+                                        pl011_rx_chars(uap);
+                        }
+                        if (status & (UART011_DSRMIS|UART011_DCDMIS|
+                                      UART011_CTSMIS|UART011_RIMIS))
+                                pl011_modem_status(uap);
+                        if (status & UART011_TXIS)
+                                pl011_tx_chars(uap);
+
+                        if (pass_counter-- == 0) {
+                                if (uap->interrupt_may_hang)
+                                        tasklet_schedule(&pl011_lockup_tlet);
+                                break;
+                        }
+
+                        status = readw(uap->port.membase + UART011_MIS);
+                } while (status != 0);
+                handled = 1;
+        }
+
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+
+        return IRQ_RETVAL(handled);
+}
+
+static unsigned int pl01x_tx_empty(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int status = readw(uap->port.membase + UART01x_FR);
+        return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int pl01x_get_mctrl(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int result = 0;
+        unsigned int status = readw(uap->port.membase + UART01x_FR);
+
+#define TIOCMBIT(uartbit, tiocmbit)     \
+        if (status & uartbit)           \
+                result |= tiocmbit
+
+        TIOCMBIT(UART01x_FR_DCD, TIOCM_CAR);
+        TIOCMBIT(UART01x_FR_DSR, TIOCM_DSR);
+        TIOCMBIT(UART01x_FR_CTS, TIOCM_CTS);
+        TIOCMBIT(UART011_FR_RI, TIOCM_RNG);
+#undef TIOCMBIT
+        return result;
+}
+
+static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int cr;
+
+        cr = readw(uap->port.membase + UART011_CR);
+
+#define TIOCMBIT(tiocmbit, uartbit)             \
+        if (mctrl & tiocmbit)           \
+                cr |= uartbit;          \
+        else                            \
+                cr &= ~uartbit
+
+        TIOCMBIT(TIOCM_RTS, UART011_CR_RTS);
+        TIOCMBIT(TIOCM_DTR, UART011_CR_DTR);
+        TIOCMBIT(TIOCM_OUT1, UART011_CR_OUT1);
+        TIOCMBIT(TIOCM_OUT2, UART011_CR_OUT2);
+        TIOCMBIT(TIOCM_LOOP, UART011_CR_LBE);
+
+        if (uap->autorts) {
+                /* We need to disable auto-RTS if we want to turn RTS off */
+                TIOCMBIT(TIOCM_RTS, UART011_CR_RTSEN);
+        }
+#undef TIOCMBIT
+
+        writew(cr, uap->port.membase + UART011_CR);
+}
+
+static void pl011_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned long flags;
+        unsigned int lcr_h;
+
+        spin_lock_irqsave(&uap->port.lock, flags);
+        lcr_h = readw(uap->port.membase + uap->lcrh_tx);
+        if (break_state == -1)
+                lcr_h |= UART01x_LCRH_BRK;
+        else
+                lcr_h &= ~UART01x_LCRH_BRK;
+        writew(lcr_h, uap->port.membase + uap->lcrh_tx);
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int pl010_get_poll_char(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int status;
+
+        status = readw(uap->port.membase + UART01x_FR);
+        if (status & UART01x_FR_RXFE)
+                return NO_POLL_CHAR;
+
+        return readw(uap->port.membase + UART01x_DR);
+}
+
+static void pl010_put_poll_char(struct uart_port *port,
+                         unsigned char ch)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF)
+                barrier();
+
+        writew(ch, uap->port.membase + UART01x_DR);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+static int pl011_startup(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int cr;
+        int retval;
+
+        /*
+         * Try to enable the clock producer.
+         */
+        retval = clk_enable(uap->clk);
+        if (retval)
+                goto out;
+
+        uap->port.uartclk = clk_get_rate(uap->clk);
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap);
+        if (retval)
+                goto clk_dis;
+
+        writew(uap->vendor->ifls, uap->port.membase + UART011_IFLS);
+
+        /*
+         * Provoke TX FIFO interrupt into asserting.
+         */
+        cr = UART01x_CR_UARTEN | UART011_CR_TXE | UART011_CR_LBE;
+        writew(cr, uap->port.membase + UART011_CR);
+        writew(0, uap->port.membase + UART011_FBRD);
+        writew(1, uap->port.membase + UART011_IBRD);
+        writew(0, uap->port.membase + uap->lcrh_rx);
+        if (uap->lcrh_tx != uap->lcrh_rx) {
+                int i;
+                /*
+                 * Wait 10 PCLKs before writing LCRH_TX register,
+                 * to get this delay write read only register 10 times
+                 */
+                for (i = 0; i < 10; ++i)
+                        writew(0xff, uap->port.membase + UART011_MIS);
+                writew(0, uap->port.membase + uap->lcrh_tx);
+        }
+        writew(0, uap->port.membase + UART01x_DR);
+        while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_BUSY)
+                barrier();
+
+        cr = UART01x_CR_UARTEN | UART011_CR_RXE | UART011_CR_TXE;
+        writew(cr, uap->port.membase + UART011_CR);
+
+        /* Clear pending error interrupts */
+        writew(UART011_OEIS | UART011_BEIS | UART011_PEIS | UART011_FEIS,
+               uap->port.membase + UART011_ICR);
+
+        /*
+         * initialise the old status of the modem signals
+         */
+        uap->old_status = readw(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+
+        /* Startup DMA */
+        pl011_dma_startup(uap);
+
+        /*
+         * Finally, enable interrupts, only timeouts when using DMA
+         * if initial RX DMA job failed, start in interrupt mode
+         * as well.
+         */
+        spin_lock_irq(&uap->port.lock);
+        uap->im = UART011_RTIM;
+        if (!pl011_dma_rx_running(uap))
+                uap->im |= UART011_RXIM;
+        writew(uap->im, uap->port.membase + UART011_IMSC);
+        spin_unlock_irq(&uap->port.lock);
+
+        if (uap->port.dev->platform_data) {
+                struct amba_pl011_data *plat;
+
+                plat = uap->port.dev->platform_data;
+                if (plat->init)
+                        plat->init();
+        }
+
+        return 0;
+
+ clk_dis:
+        clk_disable(uap->clk);
+ out:
+        return retval;
+}
+
+static void pl011_shutdown_channel(struct uart_amba_port *uap,
+                                        unsigned int lcrh)
+{
+      unsigned long val;
+
+      val = readw(uap->port.membase + lcrh);
+      val &= ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN);
+      writew(val, uap->port.membase + lcrh);
+}
+
+static void pl011_shutdown(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        /*
+         * disable all interrupts
+         */
+        spin_lock_irq(&uap->port.lock);
+        uap->im = 0;
+        writew(uap->im, uap->port.membase + UART011_IMSC);
+        writew(0xffff, uap->port.membase + UART011_ICR);
+        spin_unlock_irq(&uap->port.lock);
+
+        pl011_dma_shutdown(uap);
+
+        /*
+         * Free the interrupt
+         */
+        free_irq(uap->port.irq, uap);
+
+        /*
+         * disable the port
+         */
+        uap->autorts = false;
+        writew(UART01x_CR_UARTEN | UART011_CR_TXE, uap->port.membase + UART011_CR);
+
+        /*
+         * disable break condition and fifos
+         */
+        pl011_shutdown_channel(uap, uap->lcrh_rx);
+        if (uap->lcrh_rx != uap->lcrh_tx)
+                pl011_shutdown_channel(uap, uap->lcrh_tx);
+
+        /*
+         * Shut down the clock producer
+         */
+        clk_disable(uap->clk);
+
+        if (uap->port.dev->platform_data) {
+                struct amba_pl011_data *plat;
+
+                plat = uap->port.dev->platform_data;
+                if (plat->exit)
+                        plat->exit();
+        }
+
+}
+
+static void
+pl011_set_termios(struct uart_port *port, struct ktermios *termios,
+                     struct ktermios *old)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        unsigned int lcr_h, old_cr;
+        unsigned long flags;
+        unsigned int baud, quot, clkdiv;
+
+        if (uap->vendor->oversampling)
+                clkdiv = 8;
+        else
+                clkdiv = 16;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0,
+                                  port->uartclk / clkdiv);
+
+        if (baud > port->uartclk/16)
+                quot = DIV_ROUND_CLOSEST(port->uartclk * 8, baud);
+        else
+                quot = DIV_ROUND_CLOSEST(port->uartclk * 4, baud);
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                lcr_h = UART01x_LCRH_WLEN_5;
+                break;
+        case CS6:
+                lcr_h = UART01x_LCRH_WLEN_6;
+                break;
+        case CS7:
+                lcr_h = UART01x_LCRH_WLEN_7;
+                break;
+        default: // CS8
+                lcr_h = UART01x_LCRH_WLEN_8;
+                break;
+        }
+        if (termios->c_cflag & CSTOPB)
+                lcr_h |= UART01x_LCRH_STP2;
+        if (termios->c_cflag & PARENB) {
+                lcr_h |= UART01x_LCRH_PEN;
+                if (!(termios->c_cflag & PARODD))
+                        lcr_h |= UART01x_LCRH_EPS;
+        }
+        if (uap->fifosize > 1)
+                lcr_h |= UART01x_LCRH_FEN;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        port->read_status_mask = UART011_DR_OE | 255;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= UART011_DR_FE | UART011_DR_PE;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= UART011_DR_BE;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= UART011_DR_FE | UART011_DR_PE;
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= UART011_DR_BE;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= UART011_DR_OE;
+        }
+
+        /*
+         * Ignore all characters if CREAD is not set.
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->ignore_status_mask |= UART_DUMMY_DR_RX;
+
+        if (UART_ENABLE_MS(port, termios->c_cflag))
+                pl011_enable_ms(port);
+
+        /* first, disable everything */
+        old_cr = readw(port->membase + UART011_CR);
+        writew(0, port->membase + UART011_CR);
+
+        if (termios->c_cflag & CRTSCTS) {
+                if (old_cr & UART011_CR_RTS)
+                        old_cr |= UART011_CR_RTSEN;
+
+                old_cr |= UART011_CR_CTSEN;
+                uap->autorts = true;
+        } else {
+                old_cr &= ~(UART011_CR_CTSEN | UART011_CR_RTSEN);
+                uap->autorts = false;
+        }
+
+        if (uap->vendor->oversampling) {
+                if (baud > port->uartclk / 16)
+                        old_cr |= ST_UART011_CR_OVSFACT;
+                else
+                        old_cr &= ~ST_UART011_CR_OVSFACT;
+        }
+
+        /* Set baud rate */
+        writew(quot & 0x3f, port->membase + UART011_FBRD);
+        writew(quot >> 6, port->membase + UART011_IBRD);
+
+        /*
+         * ----------v----------v----------v----------v-----
+         * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
+         * ----------^----------^----------^----------^-----
+         */
+        writew(lcr_h, port->membase + uap->lcrh_rx);
+        if (uap->lcrh_rx != uap->lcrh_tx) {
+                int i;
+                /*
+                 * Wait 10 PCLKs before writing LCRH_TX register,
+                 * to get this delay write read only register 10 times
+                 */
+                for (i = 0; i < 10; ++i)
+                        writew(0xff, uap->port.membase + UART011_MIS);
+                writew(lcr_h, port->membase + uap->lcrh_tx);
+        }
+        writew(old_cr, port->membase + UART011_CR);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *pl011_type(struct uart_port *port)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+        return uap->port.type == PORT_AMBA ? uap->type : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'
+ */
+static void pl010_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, SZ_4K);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'
+ */
+static int pl010_request_port(struct uart_port *port)
+{
+        return request_mem_region(port->mapbase, SZ_4K, "uart-pl011")
+                        != NULL ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void pl010_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_AMBA;
+                pl010_request_port(port);
+        }
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
+                ret = -EINVAL;
+        if (ser->irq < 0 || ser->irq >= nr_irqs)
+                ret = -EINVAL;
+        if (ser->baud_base < 9600)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops amba_pl011_pops = {
+        .tx_empty       = pl01x_tx_empty,
+        .set_mctrl      = pl011_set_mctrl,
+        .get_mctrl      = pl01x_get_mctrl,
+        .stop_tx        = pl011_stop_tx,
+        .start_tx       = pl011_start_tx,
+        .stop_rx        = pl011_stop_rx,
+        .enable_ms      = pl011_enable_ms,
+        .break_ctl      = pl011_break_ctl,
+        .startup        = pl011_startup,
+        .shutdown       = pl011_shutdown,
+        .flush_buffer   = pl011_dma_flush_buffer,
+        .set_termios    = pl011_set_termios,
+        .type           = pl011_type,
+        .release_port   = pl010_release_port,
+        .request_port   = pl010_request_port,
+        .config_port    = pl010_config_port,
+        .verify_port    = pl010_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char = pl010_get_poll_char,
+        .poll_put_char = pl010_put_poll_char,
+#endif
+};
+
+static struct uart_amba_port *amba_ports[UART_NR];
+
+#ifdef CONFIG_SERIAL_AMBA_PL011_CONSOLE
+
+static void pl011_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+        while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF)
+                barrier();
+        writew(ch, uap->port.membase + UART01x_DR);
+}
+
+static void
+pl011_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_amba_port *uap = amba_ports[co->index];
+        unsigned int status, old_cr, new_cr;
+
+        clk_enable(uap->clk);
+
+        /*
+         *      First save the CR then disable the interrupts
+         */
+        old_cr = readw(uap->port.membase + UART011_CR);
+        new_cr = old_cr & ~UART011_CR_CTSEN;
+        new_cr |= UART01x_CR_UARTEN | UART011_CR_TXE;
+        writew(new_cr, uap->port.membase + UART011_CR);
+
+        uart_console_write(&uap->port, s, count, pl011_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the TCR
+         */
+        do {
+                status = readw(uap->port.membase + UART01x_FR);
+        } while (status & UART01x_FR_BUSY);
+        writew(old_cr, uap->port.membase + UART011_CR);
+
+        clk_disable(uap->clk);
+}
+
+static void __init
+pl011_console_get_options(struct uart_amba_port *uap, int *baud,
+                             int *parity, int *bits)
+{
+        if (readw(uap->port.membase + UART011_CR) & UART01x_CR_UARTEN) {
+                unsigned int lcr_h, ibrd, fbrd;
+
+                lcr_h = readw(uap->port.membase + uap->lcrh_tx);
+
+                *parity = 'n';
+                if (lcr_h & UART01x_LCRH_PEN) {
+                        if (lcr_h & UART01x_LCRH_EPS)
+                                *parity = 'e';
+                        else
+                                *parity = 'o';
+                }
+
+                if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
+                        *bits = 7;
+                else
+                        *bits = 8;
+
+                ibrd = readw(uap->port.membase + UART011_IBRD);
+                fbrd = readw(uap->port.membase + UART011_FBRD);
+
+                *baud = uap->port.uartclk * 4 / (64 * ibrd + fbrd);
+
+                if (uap->vendor->oversampling) {
+                        if (readw(uap->port.membase + UART011_CR)
+                                  & ST_UART011_CR_OVSFACT)
+                                *baud *= 2;
+                }
+        }
+}
+
+static int __init pl011_console_setup(struct console *co, char *options)
+{
+        struct uart_amba_port *uap;
+        int baud = 38400;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= UART_NR)
+                co->index = 0;
+        uap = amba_ports[co->index];
+        if (!uap)
+                return -ENODEV;
+
+        if (uap->port.dev->platform_data) {
+                struct amba_pl011_data *plat;
+
+                plat = uap->port.dev->platform_data;
+                if (plat->init)
+                        plat->init();
+        }
+
+        uap->port.uartclk = clk_get_rate(uap->clk);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                pl011_console_get_options(uap, &baud, &parity, &bits);
+
+        return uart_set_options(&uap->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver amba_reg;
+static struct console amba_console = {
+        .name           = "ttyAMA",
+        .write          = pl011_console_write,
+        .device         = uart_console_device,
+        .setup          = pl011_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &amba_reg,
+};
+
+#define AMBA_CONSOLE    (&amba_console)
+#else
+#define AMBA_CONSOLE    NULL
+#endif
+
+static struct uart_driver amba_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "ttyAMA",
+        .dev_name               = "ttyAMA",
+        .major                  = SERIAL_AMBA_MAJOR,
+        .minor                  = SERIAL_AMBA_MINOR,
+        .nr                     = UART_NR,
+        .cons                   = AMBA_CONSOLE,
+};
+
+static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
+{
+        struct uart_amba_port *uap;
+        struct vendor_data *vendor = id->data;
+        void __iomem *base;
+        int i, ret;
+
+        for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
+                if (amba_ports[i] == NULL)
+                        break;
+
+        if (i == ARRAY_SIZE(amba_ports)) {
+                ret = -EBUSY;
+                goto out;
+        }
+
+        uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
+        if (uap == NULL) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        base = ioremap(dev->res.start, resource_size(&dev->res));
+        if (!base) {
+                ret = -ENOMEM;
+                goto free;
+        }
+
+        uap->clk = clk_get(&dev->dev, NULL);
+        if (IS_ERR(uap->clk)) {
+                ret = PTR_ERR(uap->clk);
+                goto unmap;
+        }
+
+        uap->vendor = vendor;
+        uap->lcrh_rx = vendor->lcrh_rx;
+        uap->lcrh_tx = vendor->lcrh_tx;
+        uap->fifosize = vendor->fifosize;
+        uap->interrupt_may_hang = vendor->interrupt_may_hang;
+        uap->port.dev = &dev->dev;
+        uap->port.mapbase = dev->res.start;
+        uap->port.membase = base;
+        uap->port.iotype = UPIO_MEM;
+        uap->port.irq = dev->irq[0];
+        uap->port.fifosize = uap->fifosize;
+        uap->port.ops = &amba_pl011_pops;
+        uap->port.flags = UPF_BOOT_AUTOCONF;
+        uap->port.line = i;
+        pl011_dma_probe(uap);
+
+        snprintf(uap->type, sizeof(uap->type), "PL011 rev%u", amba_rev(dev));
+
+        amba_ports[i] = uap;
+
+        amba_set_drvdata(dev, uap);
+        ret = uart_add_one_port(&amba_reg, &uap->port);
+        if (ret) {
+                amba_set_drvdata(dev, NULL);
+                amba_ports[i] = NULL;
+                pl011_dma_remove(uap);
+                clk_put(uap->clk);
+ unmap:
+                iounmap(base);
+ free:
+                kfree(uap);
+        }
+ out:
+        return ret;
+}
+
+static int pl011_remove(struct amba_device *dev)
+{
+        struct uart_amba_port *uap = amba_get_drvdata(dev);
+        int i;
+
+        amba_set_drvdata(dev, NULL);
+
+        uart_remove_one_port(&amba_reg, &uap->port);
+
+        for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
+                if (amba_ports[i] == uap)
+                        amba_ports[i] = NULL;
+
+        pl011_dma_remove(uap);
+        iounmap(uap->port.membase);
+        clk_put(uap->clk);
+        kfree(uap);
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int pl011_suspend(struct amba_device *dev, pm_message_t state)
+{
+        struct uart_amba_port *uap = amba_get_drvdata(dev);
+
+        if (!uap)
+                return -EINVAL;
+
+        return uart_suspend_port(&amba_reg, &uap->port);
+}
+
+static int pl011_resume(struct amba_device *dev)
+{
+        struct uart_amba_port *uap = amba_get_drvdata(dev);
+
+        if (!uap)
+                return -EINVAL;
+
+        return uart_resume_port(&amba_reg, &uap->port);
+}
+#endif
+
+static struct amba_id pl011_ids[] = {
+        {
+                .id     = 0x00041011,
+                .mask   = 0x000fffff,
+                .data   = &vendor_arm,
+        },
+        {
+                .id     = 0x00380802,
+                .mask   = 0x00ffffff,
+                .data   = &vendor_st,
+        },
+        { 0, 0 },
+};
+
+static struct amba_driver pl011_driver = {
+        .drv = {
+                .name   = "uart-pl011",
+        },
+        .id_table       = pl011_ids,
+        .probe          = pl011_probe,
+        .remove         = pl011_remove,
+#ifdef CONFIG_PM
+        .suspend        = pl011_suspend,
+        .resume         = pl011_resume,
+#endif
+};
+
+static int __init pl011_init(void)
+{
+        int ret;
+        printk(KERN_INFO "Serial: AMBA PL011 UART driver\n");
+
+        ret = uart_register_driver(&amba_reg);
+        if (ret == 0) {
+                ret = amba_driver_register(&pl011_driver);
+                if (ret)
+                        uart_unregister_driver(&amba_reg);
+        }
+        return ret;
+}
+
+static void __exit pl011_exit(void)
+{
+        amba_driver_unregister(&pl011_driver);
+        uart_unregister_driver(&amba_reg);
+}
+
+/*
+ * While this can be a module, if builtin it's most likely the console
+ * So let's leave module_exit but move module_init to an earlier place
+ */
+arch_initcall(pl011_init);
+module_exit(pl011_exit);
+
+MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
+MODULE_DESCRIPTION("ARM AMBA serial port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
new file mode 100644
index 000000000000..19a943693e4c
--- /dev/null
+++ b/drivers/tty/serial/apbuart.c
@@ -0,0 +1,696 @@
+/*
+ *  Driver for GRLIB serial ports (APBUART)
+ *
+ *  Based on linux/drivers/serial/amba.c
+ *
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *  Copyright (C) 2003 Konrad Eisele <eiselekd@web.de>
+ *  Copyright (C) 2006 Daniel Hellstrom <daniel@gaisler.com>, Aeroflex Gaisler AB
+ *  Copyright (C) 2008 Gilead Kutnick <kutnickg@zin-tech.com>
+ *  Copyright (C) 2009 Kristoffer Glembo <kristoffer@gaisler.com>, Aeroflex Gaisler AB
+ */
+
+#if defined(CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/kthread.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/serial_core.h>
+#include <asm/irq.h>
+
+#include "apbuart.h"
+
+#define SERIAL_APBUART_MAJOR    TTY_MAJOR
+#define SERIAL_APBUART_MINOR    64
+#define UART_DUMMY_RSR_RX       0x8000  /* for ignore all read */
+
+static void apbuart_tx_chars(struct uart_port *port);
+
+static void apbuart_stop_tx(struct uart_port *port)
+{
+        unsigned int cr;
+
+        cr = UART_GET_CTRL(port);
+        cr &= ~UART_CTRL_TI;
+        UART_PUT_CTRL(port, cr);
+}
+
+static void apbuart_start_tx(struct uart_port *port)
+{
+        unsigned int cr;
+
+        cr = UART_GET_CTRL(port);
+        cr |= UART_CTRL_TI;
+        UART_PUT_CTRL(port, cr);
+
+        if (UART_GET_STATUS(port) & UART_STATUS_THE)
+                apbuart_tx_chars(port);
+}
+
+static void apbuart_stop_rx(struct uart_port *port)
+{
+        unsigned int cr;
+
+        cr = UART_GET_CTRL(port);
+        cr &= ~(UART_CTRL_RI);
+        UART_PUT_CTRL(port, cr);
+}
+
+static void apbuart_enable_ms(struct uart_port *port)
+{
+        /* No modem status change interrupts for APBUART */
+}
+
+static void apbuart_rx_chars(struct uart_port *port)
+{
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned int status, ch, rsr, flag;
+        unsigned int max_chars = port->fifosize;
+
+        status = UART_GET_STATUS(port);
+
+        while (UART_RX_DATA(status) && (max_chars--)) {
+
+                ch = UART_GET_CHAR(port);
+                flag = TTY_NORMAL;
+
+                port->icount.rx++;
+
+                rsr = UART_GET_STATUS(port) | UART_DUMMY_RSR_RX;
+                UART_PUT_STATUS(port, 0);
+                if (rsr & UART_STATUS_ERR) {
+
+                        if (rsr & UART_STATUS_BR) {
+                                rsr &= ~(UART_STATUS_FE | UART_STATUS_PE);
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        goto ignore_char;
+                        } else if (rsr & UART_STATUS_PE) {
+                                port->icount.parity++;
+                        } else if (rsr & UART_STATUS_FE) {
+                                port->icount.frame++;
+                        }
+                        if (rsr & UART_STATUS_OE)
+                                port->icount.overrun++;
+
+                        rsr &= port->read_status_mask;
+
+                        if (rsr & UART_STATUS_PE)
+                                flag = TTY_PARITY;
+                        else if (rsr & UART_STATUS_FE)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(port, rsr, UART_STATUS_OE, ch, flag);
+
+
+              ignore_char:
+                status = UART_GET_STATUS(port);
+        }
+
+        tty_flip_buffer_push(tty);
+}
+
+static void apbuart_tx_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+        int count;
+
+        if (port->x_char) {
+                UART_PUT_CHAR(port, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+                return;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                apbuart_stop_tx(port);
+                return;
+        }
+
+        /* amba: fill FIFO */
+        count = port->fifosize >> 1;
+        do {
+                UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                apbuart_stop_tx(port);
+}
+
+static irqreturn_t apbuart_int(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        unsigned int status;
+
+        spin_lock(&port->lock);
+
+        status = UART_GET_STATUS(port);
+        if (status & UART_STATUS_DR)
+                apbuart_rx_chars(port);
+        if (status & UART_STATUS_THE)
+                apbuart_tx_chars(port);
+
+        spin_unlock(&port->lock);
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int apbuart_tx_empty(struct uart_port *port)
+{
+        unsigned int status = UART_GET_STATUS(port);
+        return status & UART_STATUS_THE ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int apbuart_get_mctrl(struct uart_port *port)
+{
+        /* The GRLIB APBUART handles flow control in hardware */
+        return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+static void apbuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        /* The GRLIB APBUART handles flow control in hardware */
+}
+
+static void apbuart_break_ctl(struct uart_port *port, int break_state)
+{
+        /* We don't support sending break */
+}
+
+static int apbuart_startup(struct uart_port *port)
+{
+        int retval;
+        unsigned int cr;
+
+        /* Allocate the IRQ */
+        retval = request_irq(port->irq, apbuart_int, 0, "apbuart", port);
+        if (retval)
+                return retval;
+
+        /* Finally, enable interrupts */
+        cr = UART_GET_CTRL(port);
+        UART_PUT_CTRL(port,
+                      cr | UART_CTRL_RE | UART_CTRL_TE |
+                      UART_CTRL_RI | UART_CTRL_TI);
+
+        return 0;
+}
+
+static void apbuart_shutdown(struct uart_port *port)
+{
+        unsigned int cr;
+
+        /* disable all interrupts, disable the port */
+        cr = UART_GET_CTRL(port);
+        UART_PUT_CTRL(port,
+                      cr & ~(UART_CTRL_RE | UART_CTRL_TE |
+                             UART_CTRL_RI | UART_CTRL_TI));
+
+        /* Free the interrupt */
+        free_irq(port->irq, port);
+}
+
+static void apbuart_set_termios(struct uart_port *port,
+                                struct ktermios *termios, struct ktermios *old)
+{
+        unsigned int cr;
+        unsigned long flags;
+        unsigned int baud, quot;
+
+        /* Ask the core to calculate the divisor for us. */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+        if (baud == 0)
+                panic("invalid baudrate %i\n", port->uartclk / 16);
+
+        /* uart_get_divisor calc a *16 uart freq, apbuart is *8 */
+        quot = (uart_get_divisor(port, baud)) * 2;
+        cr = UART_GET_CTRL(port);
+        cr &= ~(UART_CTRL_PE | UART_CTRL_PS);
+
+        if (termios->c_cflag & PARENB) {
+                cr |= UART_CTRL_PE;
+                if ((termios->c_cflag & PARODD))
+                        cr |= UART_CTRL_PS;
+        }
+
+        /* Enable flow control. */
+        if (termios->c_cflag & CRTSCTS)
+                cr |= UART_CTRL_FL;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Update the per-port timeout. */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        port->read_status_mask = UART_STATUS_OE;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= UART_STATUS_FE | UART_STATUS_PE;
+
+        /* Characters to ignore */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= UART_STATUS_FE | UART_STATUS_PE;
+
+        /* Ignore all characters if CREAD is not set. */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->ignore_status_mask |= UART_DUMMY_RSR_RX;
+
+        /* Set baud rate */
+        quot -= 1;
+        UART_PUT_SCAL(port, quot);
+        UART_PUT_CTRL(port, cr);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *apbuart_type(struct uart_port *port)
+{
+        return port->type == PORT_APBUART ? "GRLIB/APBUART" : NULL;
+}
+
+static void apbuart_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, 0x100);
+}
+
+static int apbuart_request_port(struct uart_port *port)
+{
+        return request_mem_region(port->mapbase, 0x100, "grlib-apbuart")
+            != NULL ? 0 : -EBUSY;
+        return 0;
+}
+
+/* Configure/autoconfigure the port */
+static void apbuart_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_APBUART;
+                apbuart_request_port(port);
+        }
+}
+
+/* Verify the new serial_struct (for TIOCSSERIAL) */
+static int apbuart_verify_port(struct uart_port *port,
+                               struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_APBUART)
+                ret = -EINVAL;
+        if (ser->irq < 0 || ser->irq >= NR_IRQS)
+                ret = -EINVAL;
+        if (ser->baud_base < 9600)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops grlib_apbuart_ops = {
+        .tx_empty = apbuart_tx_empty,
+        .set_mctrl = apbuart_set_mctrl,
+        .get_mctrl = apbuart_get_mctrl,
+        .stop_tx = apbuart_stop_tx,
+        .start_tx = apbuart_start_tx,
+        .stop_rx = apbuart_stop_rx,
+        .enable_ms = apbuart_enable_ms,
+        .break_ctl = apbuart_break_ctl,
+        .startup = apbuart_startup,
+        .shutdown = apbuart_shutdown,
+        .set_termios = apbuart_set_termios,
+        .type = apbuart_type,
+        .release_port = apbuart_release_port,
+        .request_port = apbuart_request_port,
+        .config_port = apbuart_config_port,
+        .verify_port = apbuart_verify_port,
+};
+
+static struct uart_port grlib_apbuart_ports[UART_NR];
+static struct device_node *grlib_apbuart_nodes[UART_NR];
+
+static int apbuart_scan_fifo_size(struct uart_port *port, int portnumber)
+{
+        int ctrl, loop = 0;
+        int status;
+        int fifosize;
+        unsigned long flags;
+
+        ctrl = UART_GET_CTRL(port);
+
+        /*
+         * Enable the transceiver and wait for it to be ready to send data.
+         * Clear interrupts so that this process will not be externally
+         * interrupted in the middle (which can cause the transceiver to
+         * drain prematurely).
+         */
+
+        local_irq_save(flags);
+
+        UART_PUT_CTRL(port, ctrl | UART_CTRL_TE);
+
+        while (!UART_TX_READY(UART_GET_STATUS(port)))
+                loop++;
+
+        /*
+         * Disable the transceiver so data isn't actually sent during the
+         * actual test.
+         */
+
+        UART_PUT_CTRL(port, ctrl & ~(UART_CTRL_TE));
+
+        fifosize = 1;
+        UART_PUT_CHAR(port, 0);
+
+        /*
+         * So long as transmitting a character increments the tranceivier FIFO
+         * length the FIFO must be at least that big. These bytes will
+         * automatically drain off of the FIFO.
+         */
+
+        status = UART_GET_STATUS(port);
+        while (((status >> 20) & 0x3F) == fifosize) {
+                fifosize++;
+                UART_PUT_CHAR(port, 0);
+                status = UART_GET_STATUS(port);
+        }
+
+        fifosize--;
+
+        UART_PUT_CTRL(port, ctrl);
+        local_irq_restore(flags);
+
+        if (fifosize == 0)
+                fifosize = 1;
+
+        return fifosize;
+}
+
+static void apbuart_flush_fifo(struct uart_port *port)
+{
+        int i;
+
+        for (i = 0; i < port->fifosize; i++)
+                UART_GET_CHAR(port);
+}
+
+
+/* ======================================================================== */
+/* Console driver, if enabled                                               */
+/* ======================================================================== */
+
+#ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE
+
+static void apbuart_console_putchar(struct uart_port *port, int ch)
+{
+        unsigned int status;
+        do {
+                status = UART_GET_STATUS(port);
+        } while (!UART_TX_READY(status));
+        UART_PUT_CHAR(port, ch);
+}
+
+static void
+apbuart_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_port *port = &grlib_apbuart_ports[co->index];
+        unsigned int status, old_cr, new_cr;
+
+        /* First save the CR then disable the interrupts */
+        old_cr = UART_GET_CTRL(port);
+        new_cr = old_cr & ~(UART_CTRL_RI | UART_CTRL_TI);
+        UART_PUT_CTRL(port, new_cr);
+
+        uart_console_write(port, s, count, apbuart_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the TCR
+         */
+        do {
+                status = UART_GET_STATUS(port);
+        } while (!UART_TX_READY(status));
+        UART_PUT_CTRL(port, old_cr);
+}
+
+static void __init
+apbuart_console_get_options(struct uart_port *port, int *baud,
+                            int *parity, int *bits)
+{
+        if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) {
+
+                unsigned int quot, status;
+                status = UART_GET_STATUS(port);
+
+                *parity = 'n';
+                if (status & UART_CTRL_PE) {
+                        if ((status & UART_CTRL_PS) == 0)
+                                *parity = 'e';
+                        else
+                                *parity = 'o';
+                }
+
+                *bits = 8;
+                quot = UART_GET_SCAL(port) / 8;
+                *baud = port->uartclk / (16 * (quot + 1));
+        }
+}
+
+static int __init apbuart_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 38400;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        pr_debug("apbuart_console_setup co=%p, co->index=%i, options=%s\n",
+                 co, co->index, options);
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= grlib_apbuart_port_nr)
+                co->index = 0;
+
+        port = &grlib_apbuart_ports[co->index];
+
+        spin_lock_init(&port->lock);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                apbuart_console_get_options(port, &baud, &parity, &bits);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver grlib_apbuart_driver;
+
+static struct console grlib_apbuart_console = {
+        .name = "ttyS",
+        .write = apbuart_console_write,
+        .device = uart_console_device,
+        .setup = apbuart_console_setup,
+        .flags = CON_PRINTBUFFER,
+        .index = -1,
+        .data = &grlib_apbuart_driver,
+};
+
+
+static int grlib_apbuart_configure(void);
+
+static int __init apbuart_console_init(void)
+{
+        if (grlib_apbuart_configure())
+                return -ENODEV;
+        register_console(&grlib_apbuart_console);
+        return 0;
+}
+
+console_initcall(apbuart_console_init);
+
+#define APBUART_CONSOLE (&grlib_apbuart_console)
+#else
+#define APBUART_CONSOLE NULL
+#endif
+
+static struct uart_driver grlib_apbuart_driver = {
+        .owner = THIS_MODULE,
+        .driver_name = "serial",
+        .dev_name = "ttyS",
+        .major = SERIAL_APBUART_MAJOR,
+        .minor = SERIAL_APBUART_MINOR,
+        .nr = UART_NR,
+        .cons = APBUART_CONSOLE,
+};
+
+
+/* ======================================================================== */
+/* OF Platform Driver                                                       */
+/* ======================================================================== */
+
+static int __devinit apbuart_probe(struct platform_device *op)
+{
+        int i;
+        struct uart_port *port = NULL;
+
+        for (i = 0; i < grlib_apbuart_port_nr; i++) {
+                if (op->dev.of_node == grlib_apbuart_nodes[i])
+                        break;
+        }
+
+        port = &grlib_apbuart_ports[i];
+        port->dev = &op->dev;
+        port->irq = op->archdata.irqs[0];
+
+        uart_add_one_port(&grlib_apbuart_driver, (struct uart_port *) port);
+
+        apbuart_flush_fifo((struct uart_port *) port);
+
+        printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n",
+               (unsigned long long) port->mapbase, port->irq);
+        return 0;
+}
+
+static struct of_device_id __initdata apbuart_match[] = {
+        {
+         .name = "GAISLER_APBUART",
+         },
+        {
+         .name = "01_00c",
+         },
+        {},
+};
+
+static struct platform_driver grlib_apbuart_of_driver = {
+        .probe = apbuart_probe,
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "grlib-apbuart",
+                .of_match_table = apbuart_match,
+        },
+};
+
+
+static int grlib_apbuart_configure(void)
+{
+        struct device_node *np;
+        int line = 0;
+
+        for_each_matching_node(np, apbuart_match) {
+                const int *ampopts;
+                const u32 *freq_hz;
+                const struct amba_prom_registers *regs;
+                struct uart_port *port;
+                unsigned long addr;
+
+                ampopts = of_get_property(np, "ampopts", NULL);
+                if (ampopts && (*ampopts == 0))
+                        continue; /* Ignore if used by another OS instance */
+                regs = of_get_property(np, "reg", NULL);
+                /* Frequency of APB Bus is frequency of UART */
+                freq_hz = of_get_property(np, "freq", NULL);
+
+                if (!regs || !freq_hz || (*freq_hz == 0))
+                        continue;
+
+                grlib_apbuart_nodes[line] = np;
+
+                addr = regs->phys_addr;
+
+                port = &grlib_apbuart_ports[line];
+
+                port->mapbase = addr;
+                port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map));
+                port->irq = 0;
+                port->iotype = UPIO_MEM;
+                port->ops = &grlib_apbuart_ops;
+                port->flags = UPF_BOOT_AUTOCONF;
+                port->line = line;
+                port->uartclk = *freq_hz;
+                port->fifosize = apbuart_scan_fifo_size((struct uart_port *) port, line);
+                line++;
+
+                /* We support maximum UART_NR uarts ... */
+                if (line == UART_NR)
+                        break;
+        }
+
+        grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line;
+        return line ? 0 : -ENODEV;
+}
+
+static int __init grlib_apbuart_init(void)
+{
+        int ret;
+
+        /* Find all APBUARTS in device the tree and initialize their ports */
+        ret = grlib_apbuart_configure();
+        if (ret)
+                return ret;
+
+        printk(KERN_INFO "Serial: GRLIB APBUART driver\n");
+
+        ret = uart_register_driver(&grlib_apbuart_driver);
+
+        if (ret) {
+                printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
+                       __FILE__, ret);
+                return ret;
+        }
+
+        ret = platform_driver_register(&grlib_apbuart_of_driver);
+        if (ret) {
+                printk(KERN_ERR
+                       "%s: platform_driver_register failed (%i)\n",
+                       __FILE__, ret);
+                uart_unregister_driver(&grlib_apbuart_driver);
+                return ret;
+        }
+
+        return ret;
+}
+
+static void __exit grlib_apbuart_exit(void)
+{
+        int i;
+
+        for (i = 0; i < grlib_apbuart_port_nr; i++)
+                uart_remove_one_port(&grlib_apbuart_driver,
+                                     &grlib_apbuart_ports[i]);
+
+        uart_unregister_driver(&grlib_apbuart_driver);
+        platform_driver_unregister(&grlib_apbuart_of_driver);
+}
+
+module_init(grlib_apbuart_init);
+module_exit(grlib_apbuart_exit);
+
+MODULE_AUTHOR("Aeroflex Gaisler AB");
+MODULE_DESCRIPTION("GRLIB APBUART serial driver");
+MODULE_VERSION("2.1");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/apbuart.h b/drivers/tty/serial/apbuart.h
new file mode 100644
index 000000000000..5faf87c8d2bc
--- /dev/null
+++ b/drivers/tty/serial/apbuart.h
@@ -0,0 +1,64 @@
+#ifndef __GRLIB_APBUART_H__
+#define __GRLIB_APBUART_H__
+
+#include <asm/io.h>
+
+#define UART_NR         8
+static int grlib_apbuart_port_nr;
+
+struct grlib_apbuart_regs_map {
+        u32 data;
+        u32 status;
+        u32 ctrl;
+        u32 scaler;
+};
+
+struct amba_prom_registers {
+        unsigned int phys_addr;
+        unsigned int reg_size;
+};
+
+/*
+ *  The following defines the bits in the APBUART Status Registers.
+ */
+#define UART_STATUS_DR   0x00000001     /* Data Ready */
+#define UART_STATUS_TSE  0x00000002     /* TX Send Register Empty */
+#define UART_STATUS_THE  0x00000004     /* TX Hold Register Empty */
+#define UART_STATUS_BR   0x00000008     /* Break Error */
+#define UART_STATUS_OE   0x00000010     /* RX Overrun Error */
+#define UART_STATUS_PE   0x00000020     /* RX Parity Error */
+#define UART_STATUS_FE   0x00000040     /* RX Framing Error */
+#define UART_STATUS_ERR  0x00000078     /* Error Mask */
+
+/*
+ *  The following defines the bits in the APBUART Ctrl Registers.
+ */
+#define UART_CTRL_RE     0x00000001     /* Receiver enable */
+#define UART_CTRL_TE     0x00000002     /* Transmitter enable */
+#define UART_CTRL_RI     0x00000004     /* Receiver interrupt enable */
+#define UART_CTRL_TI     0x00000008     /* Transmitter irq */
+#define UART_CTRL_PS     0x00000010     /* Parity select */
+#define UART_CTRL_PE     0x00000020     /* Parity enable */
+#define UART_CTRL_FL     0x00000040     /* Flow control enable */
+#define UART_CTRL_LB     0x00000080     /* Loopback enable */
+
+#define APBBASE(port) ((struct grlib_apbuart_regs_map *)((port)->membase))
+
+#define APBBASE_DATA_P(port)    (&(APBBASE(port)->data))
+#define APBBASE_STATUS_P(port)  (&(APBBASE(port)->status))
+#define APBBASE_CTRL_P(port)    (&(APBBASE(port)->ctrl))
+#define APBBASE_SCALAR_P(port)  (&(APBBASE(port)->scaler))
+
+#define UART_GET_CHAR(port)     (__raw_readl(APBBASE_DATA_P(port)))
+#define UART_PUT_CHAR(port, v)  (__raw_writel(v, APBBASE_DATA_P(port)))
+#define UART_GET_STATUS(port)   (__raw_readl(APBBASE_STATUS_P(port)))
+#define UART_PUT_STATUS(port, v)(__raw_writel(v, APBBASE_STATUS_P(port)))
+#define UART_GET_CTRL(port)     (__raw_readl(APBBASE_CTRL_P(port)))
+#define UART_PUT_CTRL(port, v)  (__raw_writel(v, APBBASE_CTRL_P(port)))
+#define UART_GET_SCAL(port)     (__raw_readl(APBBASE_SCALAR_P(port)))
+#define UART_PUT_SCAL(port, v)  (__raw_writel(v, APBBASE_SCALAR_P(port)))
+
+#define UART_RX_DATA(s)         (((s) & UART_STATUS_DR) != 0)
+#define UART_TX_READY(s)        (((s) & UART_STATUS_THE) != 0)
+
+#endif /* __GRLIB_APBUART_H__ */
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
new file mode 100644
index 000000000000..af9b7814965a
--- /dev/null
+++ b/drivers/tty/serial/atmel_serial.c
@@ -0,0 +1,1828 @@
+/*
+ *  Driver for Atmel AT91 / AT32 Serial ports
+ *  Copyright (C) 2003 Rick Bronson
+ *
+ *  Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  DMA support added by Chip Coldwell.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/tty_flip.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/atmel_pdc.h>
+#include <linux/atmel_serial.h>
+#include <linux/uaccess.h>
+
+#include <asm/io.h>
+#include <asm/ioctls.h>
+
+#include <asm/mach/serial_at91.h>
+#include <mach/board.h>
+
+#ifdef CONFIG_ARM
+#include <mach/cpu.h>
+#include <mach/gpio.h>
+#endif
+
+#define PDC_BUFFER_SIZE         512
+/* Revisit: We should calculate this based on the actual port settings */
+#define PDC_RX_TIMEOUT          (3 * 10)                /* 3 bytes */
+
+#if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+static void atmel_start_rx(struct uart_port *port);
+static void atmel_stop_rx(struct uart_port *port);
+
+#ifdef CONFIG_SERIAL_ATMEL_TTYAT
+
+/* Use device name ttyAT, major 204 and minor 154-169.  This is necessary if we
+ * should coexist with the 8250 driver, such as if we have an external 16C550
+ * UART. */
+#define SERIAL_ATMEL_MAJOR      204
+#define MINOR_START             154
+#define ATMEL_DEVICENAME        "ttyAT"
+
+#else
+
+/* Use device name ttyS, major 4, minor 64-68.  This is the usual serial port
+ * name, but it is legally reserved for the 8250 driver. */
+#define SERIAL_ATMEL_MAJOR      TTY_MAJOR
+#define MINOR_START             64
+#define ATMEL_DEVICENAME        "ttyS"
+
+#endif
+
+#define ATMEL_ISR_PASS_LIMIT    256
+
+/* UART registers. CR is write-only, hence no GET macro */
+#define UART_PUT_CR(port,v)     __raw_writel(v, (port)->membase + ATMEL_US_CR)
+#define UART_GET_MR(port)       __raw_readl((port)->membase + ATMEL_US_MR)
+#define UART_PUT_MR(port,v)     __raw_writel(v, (port)->membase + ATMEL_US_MR)
+#define UART_PUT_IER(port,v)    __raw_writel(v, (port)->membase + ATMEL_US_IER)
+#define UART_PUT_IDR(port,v)    __raw_writel(v, (port)->membase + ATMEL_US_IDR)
+#define UART_GET_IMR(port)      __raw_readl((port)->membase + ATMEL_US_IMR)
+#define UART_GET_CSR(port)      __raw_readl((port)->membase + ATMEL_US_CSR)
+#define UART_GET_CHAR(port)     __raw_readl((port)->membase + ATMEL_US_RHR)
+#define UART_PUT_CHAR(port,v)   __raw_writel(v, (port)->membase + ATMEL_US_THR)
+#define UART_GET_BRGR(port)     __raw_readl((port)->membase + ATMEL_US_BRGR)
+#define UART_PUT_BRGR(port,v)   __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
+#define UART_PUT_RTOR(port,v)   __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
+#define UART_PUT_TTGR(port, v)  __raw_writel(v, (port)->membase + ATMEL_US_TTGR)
+
+ /* PDC registers */
+#define UART_PUT_PTCR(port,v)   __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
+#define UART_GET_PTSR(port)     __raw_readl((port)->membase + ATMEL_PDC_PTSR)
+
+#define UART_PUT_RPR(port,v)    __raw_writel(v, (port)->membase + ATMEL_PDC_RPR)
+#define UART_GET_RPR(port)      __raw_readl((port)->membase + ATMEL_PDC_RPR)
+#define UART_PUT_RCR(port,v)    __raw_writel(v, (port)->membase + ATMEL_PDC_RCR)
+#define UART_PUT_RNPR(port,v)   __raw_writel(v, (port)->membase + ATMEL_PDC_RNPR)
+#define UART_PUT_RNCR(port,v)   __raw_writel(v, (port)->membase + ATMEL_PDC_RNCR)
+
+#define UART_PUT_TPR(port,v)    __raw_writel(v, (port)->membase + ATMEL_PDC_TPR)
+#define UART_PUT_TCR(port,v)    __raw_writel(v, (port)->membase + ATMEL_PDC_TCR)
+#define UART_GET_TCR(port)      __raw_readl((port)->membase + ATMEL_PDC_TCR)
+
+static int (*atmel_open_hook)(struct uart_port *);
+static void (*atmel_close_hook)(struct uart_port *);
+
+struct atmel_dma_buffer {
+        unsigned char   *buf;
+        dma_addr_t      dma_addr;
+        unsigned int    dma_size;
+        unsigned int    ofs;
+};
+
+struct atmel_uart_char {
+        u16             status;
+        u16             ch;
+};
+
+#define ATMEL_SERIAL_RINGSIZE 1024
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct atmel_uart_port {
+        struct uart_port        uart;           /* uart */
+        struct clk              *clk;           /* uart clock */
+        int                     may_wakeup;     /* cached value of device_may_wakeup for times we need to disable it */
+        u32                     backup_imr;     /* IMR saved during suspend */
+        int                     break_active;   /* break being received */
+
+        short                   use_dma_rx;     /* enable PDC receiver */
+        short                   pdc_rx_idx;     /* current PDC RX buffer */
+        struct atmel_dma_buffer pdc_rx[2];      /* PDC receier */
+
+        short                   use_dma_tx;     /* enable PDC transmitter */
+        struct atmel_dma_buffer pdc_tx;         /* PDC transmitter */
+
+        struct tasklet_struct   tasklet;
+        unsigned int            irq_status;
+        unsigned int            irq_status_prev;
+
+        struct circ_buf         rx_ring;
+
+        struct serial_rs485     rs485;          /* rs485 settings */
+        unsigned int            tx_done_mask;
+};
+
+static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
+
+#ifdef SUPPORT_SYSRQ
+static struct console atmel_console;
+#endif
+
+static inline struct atmel_uart_port *
+to_atmel_uart_port(struct uart_port *uart)
+{
+        return container_of(uart, struct atmel_uart_port, uart);
+}
+
+#ifdef CONFIG_SERIAL_ATMEL_PDC
+static bool atmel_use_dma_rx(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        return atmel_port->use_dma_rx;
+}
+
+static bool atmel_use_dma_tx(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        return atmel_port->use_dma_tx;
+}
+#else
+static bool atmel_use_dma_rx(struct uart_port *port)
+{
+        return false;
+}
+
+static bool atmel_use_dma_tx(struct uart_port *port)
+{
+        return false;
+}
+#endif
+
+/* Enable or disable the rs485 support */
+void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        unsigned int mode;
+
+        spin_lock(&port->lock);
+
+        /* Disable interrupts */
+        UART_PUT_IDR(port, atmel_port->tx_done_mask);
+
+        mode = UART_GET_MR(port);
+
+        /* Resetting serial mode to RS232 (0x0) */
+        mode &= ~ATMEL_US_USMODE;
+
+        atmel_port->rs485 = *rs485conf;
+
+        if (rs485conf->flags & SER_RS485_ENABLED) {
+                dev_dbg(port->dev, "Setting UART to RS485\n");
+                atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
+                if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND)
+                        UART_PUT_TTGR(port, rs485conf->delay_rts_after_send);
+                mode |= ATMEL_US_USMODE_RS485;
+        } else {
+                dev_dbg(port->dev, "Setting UART to RS232\n");
+                if (atmel_use_dma_tx(port))
+                        atmel_port->tx_done_mask = ATMEL_US_ENDTX |
+                                ATMEL_US_TXBUFE;
+                else
+                        atmel_port->tx_done_mask = ATMEL_US_TXRDY;
+        }
+        UART_PUT_MR(port, mode);
+
+        /* Enable interrupts */
+        UART_PUT_IER(port, atmel_port->tx_done_mask);
+
+        spin_unlock(&port->lock);
+
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
+ */
+static u_int atmel_tx_empty(struct uart_port *port)
+{
+        return (UART_GET_CSR(port) & ATMEL_US_TXEMPTY) ? TIOCSER_TEMT : 0;
+}
+
+/*
+ * Set state of the modem control output lines
+ */
+static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
+{
+        unsigned int control = 0;
+        unsigned int mode;
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+#ifdef CONFIG_ARCH_AT91RM9200
+        if (cpu_is_at91rm9200()) {
+                /*
+                 * AT91RM9200 Errata #39: RTS0 is not internally connected
+                 * to PA21. We need to drive the pin manually.
+                 */
+                if (port->mapbase == AT91RM9200_BASE_US0) {
+                        if (mctrl & TIOCM_RTS)
+                                at91_set_gpio_value(AT91_PIN_PA21, 0);
+                        else
+                                at91_set_gpio_value(AT91_PIN_PA21, 1);
+                }
+        }
+#endif
+
+        if (mctrl & TIOCM_RTS)
+                control |= ATMEL_US_RTSEN;
+        else
+                control |= ATMEL_US_RTSDIS;
+
+        if (mctrl & TIOCM_DTR)
+                control |= ATMEL_US_DTREN;
+        else
+                control |= ATMEL_US_DTRDIS;
+
+        UART_PUT_CR(port, control);
+
+        /* Local loopback mode? */
+        mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE;
+        if (mctrl & TIOCM_LOOP)
+                mode |= ATMEL_US_CHMODE_LOC_LOOP;
+        else
+                mode |= ATMEL_US_CHMODE_NORMAL;
+
+        /* Resetting serial mode to RS232 (0x0) */
+        mode &= ~ATMEL_US_USMODE;
+
+        if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+                dev_dbg(port->dev, "Setting UART to RS485\n");
+                if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+                        UART_PUT_TTGR(port,
+                                        atmel_port->rs485.delay_rts_after_send);
+                mode |= ATMEL_US_USMODE_RS485;
+        } else {
+                dev_dbg(port->dev, "Setting UART to RS232\n");
+        }
+        UART_PUT_MR(port, mode);
+}
+
+/*
+ * Get state of the modem control input lines
+ */
+static u_int atmel_get_mctrl(struct uart_port *port)
+{
+        unsigned int status, ret = 0;
+
+        status = UART_GET_CSR(port);
+
+        /*
+         * The control signals are active low.
+         */
+        if (!(status & ATMEL_US_DCD))
+                ret |= TIOCM_CD;
+        if (!(status & ATMEL_US_CTS))
+                ret |= TIOCM_CTS;
+        if (!(status & ATMEL_US_DSR))
+                ret |= TIOCM_DSR;
+        if (!(status & ATMEL_US_RI))
+                ret |= TIOCM_RI;
+
+        return ret;
+}
+
+/*
+ * Stop transmitting.
+ */
+static void atmel_stop_tx(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (atmel_use_dma_tx(port)) {
+                /* disable PDC transmit */
+                UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+        }
+        /* Disable interrupts */
+        UART_PUT_IDR(port, atmel_port->tx_done_mask);
+
+        if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+                atmel_start_rx(port);
+}
+
+/*
+ * Start transmitting.
+ */
+static void atmel_start_tx(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (atmel_use_dma_tx(port)) {
+                if (UART_GET_PTSR(port) & ATMEL_PDC_TXTEN)
+                        /* The transmitter is already running.  Yes, we
+                           really need this.*/
+                        return;
+
+                if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+                        atmel_stop_rx(port);
+
+                /* re-enable PDC transmit */
+                UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
+        }
+        /* Enable interrupts */
+        UART_PUT_IER(port, atmel_port->tx_done_mask);
+}
+
+/*
+ * start receiving - port is in process of being opened.
+ */
+static void atmel_start_rx(struct uart_port *port)
+{
+        UART_PUT_CR(port, ATMEL_US_RSTSTA);  /* reset status and receiver */
+
+        if (atmel_use_dma_rx(port)) {
+                /* enable PDC controller */
+                UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
+                        port->read_status_mask);
+                UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
+        } else {
+                UART_PUT_IER(port, ATMEL_US_RXRDY);
+        }
+}
+
+/*
+ * Stop receiving - port is in process of being closed.
+ */
+static void atmel_stop_rx(struct uart_port *port)
+{
+        if (atmel_use_dma_rx(port)) {
+                /* disable PDC receive */
+                UART_PUT_PTCR(port, ATMEL_PDC_RXTDIS);
+                UART_PUT_IDR(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
+                        port->read_status_mask);
+        } else {
+                UART_PUT_IDR(port, ATMEL_US_RXRDY);
+        }
+}
+
+/*
+ * Enable modem status interrupts
+ */
+static void atmel_enable_ms(struct uart_port *port)
+{
+        UART_PUT_IER(port, ATMEL_US_RIIC | ATMEL_US_DSRIC
+                        | ATMEL_US_DCDIC | ATMEL_US_CTSIC);
+}
+
+/*
+ * Control the transmission of a break signal
+ */
+static void atmel_break_ctl(struct uart_port *port, int break_state)
+{
+        if (break_state != 0)
+                UART_PUT_CR(port, ATMEL_US_STTBRK);     /* start break */
+        else
+                UART_PUT_CR(port, ATMEL_US_STPBRK);     /* stop break */
+}
+
+/*
+ * Stores the incoming character in the ring buffer
+ */
+static void
+atmel_buffer_rx_char(struct uart_port *port, unsigned int status,
+                     unsigned int ch)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        struct circ_buf *ring = &atmel_port->rx_ring;
+        struct atmel_uart_char *c;
+
+        if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE))
+                /* Buffer overflow, ignore char */
+                return;
+
+        c = &((struct atmel_uart_char *)ring->buf)[ring->head];
+        c->status       = status;
+        c->ch           = ch;
+
+        /* Make sure the character is stored before we update head. */
+        smp_wmb();
+
+        ring->head = (ring->head + 1) & (ATMEL_SERIAL_RINGSIZE - 1);
+}
+
+/*
+ * Deal with parity, framing and overrun errors.
+ */
+static void atmel_pdc_rxerr(struct uart_port *port, unsigned int status)
+{
+        /* clear error */
+        UART_PUT_CR(port, ATMEL_US_RSTSTA);
+
+        if (status & ATMEL_US_RXBRK) {
+                /* ignore side-effect */
+                status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME);
+                port->icount.brk++;
+        }
+        if (status & ATMEL_US_PARE)
+                port->icount.parity++;
+        if (status & ATMEL_US_FRAME)
+                port->icount.frame++;
+        if (status & ATMEL_US_OVRE)
+                port->icount.overrun++;
+}
+
+/*
+ * Characters received (called from interrupt handler)
+ */
+static void atmel_rx_chars(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        unsigned int status, ch;
+
+        status = UART_GET_CSR(port);
+        while (status & ATMEL_US_RXRDY) {
+                ch = UART_GET_CHAR(port);
+
+                /*
+                 * note that the error handling code is
+                 * out of the main execution path
+                 */
+                if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME
+                                       | ATMEL_US_OVRE | ATMEL_US_RXBRK)
+                             || atmel_port->break_active)) {
+
+                        /* clear error */
+                        UART_PUT_CR(port, ATMEL_US_RSTSTA);
+
+                        if (status & ATMEL_US_RXBRK
+                            && !atmel_port->break_active) {
+                                atmel_port->break_active = 1;
+                                UART_PUT_IER(port, ATMEL_US_RXBRK);
+                        } else {
+                                /*
+                                 * This is either the end-of-break
+                                 * condition or we've received at
+                                 * least one character without RXBRK
+                                 * being set. In both cases, the next
+                                 * RXBRK will indicate start-of-break.
+                                 */
+                                UART_PUT_IDR(port, ATMEL_US_RXBRK);
+                                status &= ~ATMEL_US_RXBRK;
+                                atmel_port->break_active = 0;
+                        }
+                }
+
+                atmel_buffer_rx_char(port, status, ch);
+                status = UART_GET_CSR(port);
+        }
+
+        tasklet_schedule(&atmel_port->tasklet);
+}
+
+/*
+ * Transmit characters (called from tasklet with TXRDY interrupt
+ * disabled)
+ */
+static void atmel_tx_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (port->x_char && UART_GET_CSR(port) & atmel_port->tx_done_mask) {
+                UART_PUT_CHAR(port, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+                return;
+
+        while (UART_GET_CSR(port) & atmel_port->tx_done_mask) {
+                UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (!uart_circ_empty(xmit))
+                /* Enable interrupts */
+                UART_PUT_IER(port, atmel_port->tx_done_mask);
+}
+
+/*
+ * receive interrupt handler.
+ */
+static void
+atmel_handle_receive(struct uart_port *port, unsigned int pending)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (atmel_use_dma_rx(port)) {
+                /*
+                 * PDC receive. Just schedule the tasklet and let it
+                 * figure out the details.
+                 *
+                 * TODO: We're not handling error flags correctly at
+                 * the moment.
+                 */
+                if (pending & (ATMEL_US_ENDRX | ATMEL_US_TIMEOUT)) {
+                        UART_PUT_IDR(port, (ATMEL_US_ENDRX
+                                                | ATMEL_US_TIMEOUT));
+                        tasklet_schedule(&atmel_port->tasklet);
+                }
+
+                if (pending & (ATMEL_US_RXBRK | ATMEL_US_OVRE |
+                                ATMEL_US_FRAME | ATMEL_US_PARE))
+                        atmel_pdc_rxerr(port, pending);
+        }
+
+        /* Interrupt receive */
+        if (pending & ATMEL_US_RXRDY)
+                atmel_rx_chars(port);
+        else if (pending & ATMEL_US_RXBRK) {
+                /*
+                 * End of break detected. If it came along with a
+                 * character, atmel_rx_chars will handle it.
+                 */
+                UART_PUT_CR(port, ATMEL_US_RSTSTA);
+                UART_PUT_IDR(port, ATMEL_US_RXBRK);
+                atmel_port->break_active = 0;
+        }
+}
+
+/*
+ * transmit interrupt handler. (Transmit is IRQF_NODELAY safe)
+ */
+static void
+atmel_handle_transmit(struct uart_port *port, unsigned int pending)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (pending & atmel_port->tx_done_mask) {
+                /* Either PDC or interrupt transmission */
+                UART_PUT_IDR(port, atmel_port->tx_done_mask);
+                tasklet_schedule(&atmel_port->tasklet);
+        }
+}
+
+/*
+ * status flags interrupt handler.
+ */
+static void
+atmel_handle_status(struct uart_port *port, unsigned int pending,
+                    unsigned int status)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC
+                                | ATMEL_US_CTSIC)) {
+                atmel_port->irq_status = status;
+                tasklet_schedule(&atmel_port->tasklet);
+        }
+}
+
+/*
+ * Interrupt handler
+ */
+static irqreturn_t atmel_interrupt(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        unsigned int status, pending, pass_counter = 0;
+
+        do {
+                status = UART_GET_CSR(port);
+                pending = status & UART_GET_IMR(port);
+                if (!pending)
+                        break;
+
+                atmel_handle_receive(port, pending);
+                atmel_handle_status(port, pending, status);
+                atmel_handle_transmit(port, pending);
+        } while (pass_counter++ < ATMEL_ISR_PASS_LIMIT);
+
+        return pass_counter ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/*
+ * Called from tasklet with ENDTX and TXBUFE interrupts disabled.
+ */
+static void atmel_tx_dma(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        struct circ_buf *xmit = &port->state->xmit;
+        struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
+        int count;
+
+        /* nothing left to transmit? */
+        if (UART_GET_TCR(port))
+                return;
+
+        xmit->tail += pdc->ofs;
+        xmit->tail &= UART_XMIT_SIZE - 1;
+
+        port->icount.tx += pdc->ofs;
+        pdc->ofs = 0;
+
+        /* more to transmit - setup next transfer */
+
+        /* disable PDC transmit */
+        UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+
+        if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) {
+                dma_sync_single_for_device(port->dev,
+                                           pdc->dma_addr,
+                                           pdc->dma_size,
+                                           DMA_TO_DEVICE);
+
+                count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+                pdc->ofs = count;
+
+                UART_PUT_TPR(port, pdc->dma_addr + xmit->tail);
+                UART_PUT_TCR(port, count);
+                /* re-enable PDC transmit */
+                UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
+                /* Enable interrupts */
+                UART_PUT_IER(port, atmel_port->tx_done_mask);
+        } else {
+                if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+                        /* DMA done, stop TX, start RX for RS485 */
+                        atmel_start_rx(port);
+                }
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+}
+
+static void atmel_rx_from_ring(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        struct circ_buf *ring = &atmel_port->rx_ring;
+        unsigned int flg;
+        unsigned int status;
+
+        while (ring->head != ring->tail) {
+                struct atmel_uart_char c;
+
+                /* Make sure c is loaded after head. */
+                smp_rmb();
+
+                c = ((struct atmel_uart_char *)ring->buf)[ring->tail];
+
+                ring->tail = (ring->tail + 1) & (ATMEL_SERIAL_RINGSIZE - 1);
+
+                port->icount.rx++;
+                status = c.status;
+                flg = TTY_NORMAL;
+
+                /*
+                 * note that the error handling code is
+                 * out of the main execution path
+                 */
+                if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME
+                                       | ATMEL_US_OVRE | ATMEL_US_RXBRK))) {
+                        if (status & ATMEL_US_RXBRK) {
+                                /* ignore side-effect */
+                                status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME);
+
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        continue;
+                        }
+                        if (status & ATMEL_US_PARE)
+                                port->icount.parity++;
+                        if (status & ATMEL_US_FRAME)
+                                port->icount.frame++;
+                        if (status & ATMEL_US_OVRE)
+                                port->icount.overrun++;
+
+                        status &= port->read_status_mask;
+
+                        if (status & ATMEL_US_RXBRK)
+                                flg = TTY_BREAK;
+                        else if (status & ATMEL_US_PARE)
+                                flg = TTY_PARITY;
+                        else if (status & ATMEL_US_FRAME)
+                                flg = TTY_FRAME;
+                }
+
+
+                if (uart_handle_sysrq_char(port, c.ch))
+                        continue;
+
+                uart_insert_char(port, status, ATMEL_US_OVRE, c.ch, flg);
+        }
+
+        /*
+         * Drop the lock here since it might end up calling
+         * uart_start(), which takes the lock.
+         */
+        spin_unlock(&port->lock);
+        tty_flip_buffer_push(port->state->port.tty);
+        spin_lock(&port->lock);
+}
+
+static void atmel_rx_from_dma(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        struct tty_struct *tty = port->state->port.tty;
+        struct atmel_dma_buffer *pdc;
+        int rx_idx = atmel_port->pdc_rx_idx;
+        unsigned int head;
+        unsigned int tail;
+        unsigned int count;
+
+        do {
+                /* Reset the UART timeout early so that we don't miss one */
+                UART_PUT_CR(port, ATMEL_US_STTTO);
+
+                pdc = &atmel_port->pdc_rx[rx_idx];
+                head = UART_GET_RPR(port) - pdc->dma_addr;
+                tail = pdc->ofs;
+
+                /* If the PDC has switched buffers, RPR won't contain
+                 * any address within the current buffer. Since head
+                 * is unsigned, we just need a one-way comparison to
+                 * find out.
+                 *
+                 * In this case, we just need to consume the entire
+                 * buffer and resubmit it for DMA. This will clear the
+                 * ENDRX bit as well, so that we can safely re-enable
+                 * all interrupts below.
+                 */
+                head = min(head, pdc->dma_size);
+
+                if (likely(head != tail)) {
+                        dma_sync_single_for_cpu(port->dev, pdc->dma_addr,
+                                        pdc->dma_size, DMA_FROM_DEVICE);
+
+                        /*
+                         * head will only wrap around when we recycle
+                         * the DMA buffer, and when that happens, we
+                         * explicitly set tail to 0. So head will
+                         * always be greater than tail.
+                         */
+                        count = head - tail;
+
+                        tty_insert_flip_string(tty, pdc->buf + pdc->ofs, count);
+
+                        dma_sync_single_for_device(port->dev, pdc->dma_addr,
+                                        pdc->dma_size, DMA_FROM_DEVICE);
+
+                        port->icount.rx += count;
+                        pdc->ofs = head;
+                }
+
+                /*
+                 * If the current buffer is full, we need to check if
+                 * the next one contains any additional data.
+                 */
+                if (head >= pdc->dma_size) {
+                        pdc->ofs = 0;
+                        UART_PUT_RNPR(port, pdc->dma_addr);
+                        UART_PUT_RNCR(port, pdc->dma_size);
+
+                        rx_idx = !rx_idx;
+                        atmel_port->pdc_rx_idx = rx_idx;
+                }
+        } while (head >= pdc->dma_size);
+
+        /*
+         * Drop the lock here since it might end up calling
+         * uart_start(), which takes the lock.
+         */
+        spin_unlock(&port->lock);
+        tty_flip_buffer_push(tty);
+        spin_lock(&port->lock);
+
+        UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
+}
+
+/*
+ * tasklet handling tty stuff outside the interrupt handler.
+ */
+static void atmel_tasklet_func(unsigned long data)
+{
+        struct uart_port *port = (struct uart_port *)data;
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        unsigned int status;
+        unsigned int status_change;
+
+        /* The interrupt handler does not take the lock */
+        spin_lock(&port->lock);
+
+        if (atmel_use_dma_tx(port))
+                atmel_tx_dma(port);
+        else
+                atmel_tx_chars(port);
+
+        status = atmel_port->irq_status;
+        status_change = status ^ atmel_port->irq_status_prev;
+
+        if (status_change & (ATMEL_US_RI | ATMEL_US_DSR
+                                | ATMEL_US_DCD | ATMEL_US_CTS)) {
+                /* TODO: All reads to CSR will clear these interrupts! */
+                if (status_change & ATMEL_US_RI)
+                        port->icount.rng++;
+                if (status_change & ATMEL_US_DSR)
+                        port->icount.dsr++;
+                if (status_change & ATMEL_US_DCD)
+                        uart_handle_dcd_change(port, !(status & ATMEL_US_DCD));
+                if (status_change & ATMEL_US_CTS)
+                        uart_handle_cts_change(port, !(status & ATMEL_US_CTS));
+
+                wake_up_interruptible(&port->state->port.delta_msr_wait);
+
+                atmel_port->irq_status_prev = status;
+        }
+
+        if (atmel_use_dma_rx(port))
+                atmel_rx_from_dma(port);
+        else
+                atmel_rx_from_ring(port);
+
+        spin_unlock(&port->lock);
+}
+
+/*
+ * Perform initialization and enable port for reception
+ */
+static int atmel_startup(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        struct tty_struct *tty = port->state->port.tty;
+        int retval;
+
+        /*
+         * Ensure that no interrupts are enabled otherwise when
+         * request_irq() is called we could get stuck trying to
+         * handle an unexpected interrupt
+         */
+        UART_PUT_IDR(port, -1);
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(port->irq, atmel_interrupt, IRQF_SHARED,
+                        tty ? tty->name : "atmel_serial", port);
+        if (retval) {
+                printk("atmel_serial: atmel_startup - Can't get irq\n");
+                return retval;
+        }
+
+        /*
+         * Initialize DMA (if necessary)
+         */
+        if (atmel_use_dma_rx(port)) {
+                int i;
+
+                for (i = 0; i < 2; i++) {
+                        struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
+
+                        pdc->buf = kmalloc(PDC_BUFFER_SIZE, GFP_KERNEL);
+                        if (pdc->buf == NULL) {
+                                if (i != 0) {
+                                        dma_unmap_single(port->dev,
+                                                atmel_port->pdc_rx[0].dma_addr,
+                                                PDC_BUFFER_SIZE,
+                                                DMA_FROM_DEVICE);
+                                        kfree(atmel_port->pdc_rx[0].buf);
+                                }
+                                free_irq(port->irq, port);
+                                return -ENOMEM;
+                        }
+                        pdc->dma_addr = dma_map_single(port->dev,
+                                                       pdc->buf,
+                                                       PDC_BUFFER_SIZE,
+                                                       DMA_FROM_DEVICE);
+                        pdc->dma_size = PDC_BUFFER_SIZE;
+                        pdc->ofs = 0;
+                }
+
+                atmel_port->pdc_rx_idx = 0;
+
+                UART_PUT_RPR(port, atmel_port->pdc_rx[0].dma_addr);
+                UART_PUT_RCR(port, PDC_BUFFER_SIZE);
+
+                UART_PUT_RNPR(port, atmel_port->pdc_rx[1].dma_addr);
+                UART_PUT_RNCR(port, PDC_BUFFER_SIZE);
+        }
+        if (atmel_use_dma_tx(port)) {
+                struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
+                struct circ_buf *xmit = &port->state->xmit;
+
+                pdc->buf = xmit->buf;
+                pdc->dma_addr = dma_map_single(port->dev,
+                                               pdc->buf,
+                                               UART_XMIT_SIZE,
+                                               DMA_TO_DEVICE);
+                pdc->dma_size = UART_XMIT_SIZE;
+                pdc->ofs = 0;
+        }
+
+        /*
+         * If there is a specific "open" function (to register
+         * control line interrupts)
+         */
+        if (atmel_open_hook) {
+                retval = atmel_open_hook(port);
+                if (retval) {
+                        free_irq(port->irq, port);
+                        return retval;
+                }
+        }
+
+        /* Save current CSR for comparison in atmel_tasklet_func() */
+        atmel_port->irq_status_prev = UART_GET_CSR(port);
+        atmel_port->irq_status = atmel_port->irq_status_prev;
+
+        /*
+         * Finally, enable the serial port
+         */
+        UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
+        /* enable xmit & rcvr */
+        UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
+
+        if (atmel_use_dma_rx(port)) {
+                /* set UART timeout */
+                UART_PUT_RTOR(port, PDC_RX_TIMEOUT);
+                UART_PUT_CR(port, ATMEL_US_STTTO);
+
+                UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
+                /* enable PDC controller */
+                UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
+        } else {
+                /* enable receive only */
+                UART_PUT_IER(port, ATMEL_US_RXRDY);
+        }
+
+        return 0;
+}
+
+/*
+ * Disable the port
+ */
+static void atmel_shutdown(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        /*
+         * Ensure everything is stopped.
+         */
+        atmel_stop_rx(port);
+        atmel_stop_tx(port);
+
+        /*
+         * Shut-down the DMA.
+         */
+        if (atmel_use_dma_rx(port)) {
+                int i;
+
+                for (i = 0; i < 2; i++) {
+                        struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
+
+                        dma_unmap_single(port->dev,
+                                         pdc->dma_addr,
+                                         pdc->dma_size,
+                                         DMA_FROM_DEVICE);
+                        kfree(pdc->buf);
+                }
+        }
+        if (atmel_use_dma_tx(port)) {
+                struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
+
+                dma_unmap_single(port->dev,
+                                 pdc->dma_addr,
+                                 pdc->dma_size,
+                                 DMA_TO_DEVICE);
+        }
+
+        /*
+         * Disable all interrupts, port and break condition.
+         */
+        UART_PUT_CR(port, ATMEL_US_RSTSTA);
+        UART_PUT_IDR(port, -1);
+
+        /*
+         * Free the interrupt
+         */
+        free_irq(port->irq, port);
+
+        /*
+         * If there is a specific "close" function (to unregister
+         * control line interrupts)
+         */
+        if (atmel_close_hook)
+                atmel_close_hook(port);
+}
+
+/*
+ * Flush any TX data submitted for DMA. Called when the TX circular
+ * buffer is reset.
+ */
+static void atmel_flush_buffer(struct uart_port *port)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (atmel_use_dma_tx(port)) {
+                UART_PUT_TCR(port, 0);
+                atmel_port->pdc_tx.ofs = 0;
+        }
+}
+
+/*
+ * Power / Clock management.
+ */
+static void atmel_serial_pm(struct uart_port *port, unsigned int state,
+                            unsigned int oldstate)
+{
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        switch (state) {
+        case 0:
+                /*
+                 * Enable the peripheral clock for this serial port.
+                 * This is called on uart_open() or a resume event.
+                 */
+                clk_enable(atmel_port->clk);
+
+                /* re-enable interrupts if we disabled some on suspend */
+                UART_PUT_IER(port, atmel_port->backup_imr);
+                break;
+        case 3:
+                /* Back up the interrupt mask and disable all interrupts */
+                atmel_port->backup_imr = UART_GET_IMR(port);
+                UART_PUT_IDR(port, -1);
+
+                /*
+                 * Disable the peripheral clock for this serial port.
+                 * This is called on uart_close() or a suspend event.
+                 */
+                clk_disable(atmel_port->clk);
+                break;
+        default:
+                printk(KERN_ERR "atmel_serial: unknown pm %d\n", state);
+        }
+}
+
+/*
+ * Change the port parameters
+ */
+static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
+                              struct ktermios *old)
+{
+        unsigned long flags;
+        unsigned int mode, imr, quot, baud;
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        /* Get current mode register */
+        mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL
+                                        | ATMEL_US_NBSTOP | ATMEL_US_PAR
+                                        | ATMEL_US_USMODE);
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+        quot = uart_get_divisor(port, baud);
+
+        if (quot > 65535) {     /* BRGR is 16-bit, so switch to slower clock */
+                quot /= 8;
+                mode |= ATMEL_US_USCLKS_MCK_DIV8;
+        }
+
+        /* byte size */
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                mode |= ATMEL_US_CHRL_5;
+                break;
+        case CS6:
+                mode |= ATMEL_US_CHRL_6;
+                break;
+        case CS7:
+                mode |= ATMEL_US_CHRL_7;
+                break;
+        default:
+                mode |= ATMEL_US_CHRL_8;
+                break;
+        }
+
+        /* stop bits */
+        if (termios->c_cflag & CSTOPB)
+                mode |= ATMEL_US_NBSTOP_2;
+
+        /* parity */
+        if (termios->c_cflag & PARENB) {
+                /* Mark or Space parity */
+                if (termios->c_cflag & CMSPAR) {
+                        if (termios->c_cflag & PARODD)
+                                mode |= ATMEL_US_PAR_MARK;
+                        else
+                                mode |= ATMEL_US_PAR_SPACE;
+                } else if (termios->c_cflag & PARODD)
+                        mode |= ATMEL_US_PAR_ODD;
+                else
+                        mode |= ATMEL_US_PAR_EVEN;
+        } else
+                mode |= ATMEL_US_PAR_NONE;
+
+        /* hardware handshake (RTS/CTS) */
+        if (termios->c_cflag & CRTSCTS)
+                mode |= ATMEL_US_USMODE_HWHS;
+        else
+                mode |= ATMEL_US_USMODE_NORMAL;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        port->read_status_mask = ATMEL_US_OVRE;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= ATMEL_US_RXBRK;
+
+        if (atmel_use_dma_rx(port))
+                /* need to enable error interrupts */
+                UART_PUT_IER(port, port->read_status_mask);
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= ATMEL_US_RXBRK;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= ATMEL_US_OVRE;
+        }
+        /* TODO: Ignore all characters if CREAD is set.*/
+
+        /* update the per-port timeout */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /*
+         * save/disable interrupts. The tty layer will ensure that the
+         * transmitter is empty if requested by the caller, so there's
+         * no need to wait for it here.
+         */
+        imr = UART_GET_IMR(port);
+        UART_PUT_IDR(port, -1);
+
+        /* disable receiver and transmitter */
+        UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
+
+        /* Resetting serial mode to RS232 (0x0) */
+        mode &= ~ATMEL_US_USMODE;
+
+        if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+                dev_dbg(port->dev, "Setting UART to RS485\n");
+                if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+                        UART_PUT_TTGR(port,
+                                        atmel_port->rs485.delay_rts_after_send);
+                mode |= ATMEL_US_USMODE_RS485;
+        } else {
+                dev_dbg(port->dev, "Setting UART to RS232\n");
+        }
+
+        /* set the parity, stop bits and data size */
+        UART_PUT_MR(port, mode);
+
+        /* set the baud rate */
+        UART_PUT_BRGR(port, quot);
+        UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
+        UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
+
+        /* restore interrupts */
+        UART_PUT_IER(port, imr);
+
+        /* CTS flow-control and modem-status interrupts */
+        if (UART_ENABLE_MS(port, termios->c_cflag))
+                port->ops->enable_ms(port);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void atmel_set_ldisc(struct uart_port *port, int new)
+{
+        int line = port->line;
+
+        if (line >= port->state->port.tty->driver->num)
+                return;
+
+        if (port->state->port.tty->ldisc->ops->num == N_PPS) {
+                port->flags |= UPF_HARDPPS_CD;
+                atmel_enable_ms(port);
+        } else {
+                port->flags &= ~UPF_HARDPPS_CD;
+        }
+}
+
+/*
+ * Return string describing the specified port
+ */
+static const char *atmel_type(struct uart_port *port)
+{
+        return (port->type == PORT_ATMEL) ? "ATMEL_SERIAL" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void atmel_release_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        int size = pdev->resource[0].end - pdev->resource[0].start + 1;
+
+        release_mem_region(port->mapbase, size);
+
+        if (port->flags & UPF_IOREMAP) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int atmel_request_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        int size = pdev->resource[0].end - pdev->resource[0].start + 1;
+
+        if (!request_mem_region(port->mapbase, size, "atmel_serial"))
+                return -EBUSY;
+
+        if (port->flags & UPF_IOREMAP) {
+                port->membase = ioremap(port->mapbase, size);
+                if (port->membase == NULL) {
+                        release_mem_region(port->mapbase, size);
+                        return -ENOMEM;
+                }
+        }
+
+        return 0;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void atmel_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_ATMEL;
+                atmel_request_port(port);
+        }
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_ATMEL)
+                ret = -EINVAL;
+        if (port->irq != ser->irq)
+                ret = -EINVAL;
+        if (ser->io_type != SERIAL_IO_MEM)
+                ret = -EINVAL;
+        if (port->uartclk / 16 != ser->baud_base)
+                ret = -EINVAL;
+        if ((void *)port->mapbase != ser->iomem_base)
+                ret = -EINVAL;
+        if (port->iobase != ser->port)
+                ret = -EINVAL;
+        if (ser->hub6 != 0)
+                ret = -EINVAL;
+        return ret;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int atmel_poll_get_char(struct uart_port *port)
+{
+        while (!(UART_GET_CSR(port) & ATMEL_US_RXRDY))
+                cpu_relax();
+
+        return UART_GET_CHAR(port);
+}
+
+static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+        while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
+                cpu_relax();
+
+        UART_PUT_CHAR(port, ch);
+}
+#endif
+
+static int
+atmel_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
+{
+        struct serial_rs485 rs485conf;
+
+        switch (cmd) {
+        case TIOCSRS485:
+                if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
+                                        sizeof(rs485conf)))
+                        return -EFAULT;
+
+                atmel_config_rs485(port, &rs485conf);
+                break;
+
+        case TIOCGRS485:
+                if (copy_to_user((struct serial_rs485 *) arg,
+                                        &(to_atmel_uart_port(port)->rs485),
+                                        sizeof(rs485conf)))
+                        return -EFAULT;
+                break;
+
+        default:
+                return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+
+
+static struct uart_ops atmel_pops = {
+        .tx_empty       = atmel_tx_empty,
+        .set_mctrl      = atmel_set_mctrl,
+        .get_mctrl      = atmel_get_mctrl,
+        .stop_tx        = atmel_stop_tx,
+        .start_tx       = atmel_start_tx,
+        .stop_rx        = atmel_stop_rx,
+        .enable_ms      = atmel_enable_ms,
+        .break_ctl      = atmel_break_ctl,
+        .startup        = atmel_startup,
+        .shutdown       = atmel_shutdown,
+        .flush_buffer   = atmel_flush_buffer,
+        .set_termios    = atmel_set_termios,
+        .set_ldisc      = atmel_set_ldisc,
+        .type           = atmel_type,
+        .release_port   = atmel_release_port,
+        .request_port   = atmel_request_port,
+        .config_port    = atmel_config_port,
+        .verify_port    = atmel_verify_port,
+        .pm             = atmel_serial_pm,
+        .ioctl          = atmel_ioctl,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char  = atmel_poll_get_char,
+        .poll_put_char  = atmel_poll_put_char,
+#endif
+};
+
+/*
+ * Configure the port from the platform device resource info.
+ */
+static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
+                                      struct platform_device *pdev)
+{
+        struct uart_port *port = &atmel_port->uart;
+        struct atmel_uart_data *data = pdev->dev.platform_data;
+
+        port->iotype            = UPIO_MEM;
+        port->flags             = UPF_BOOT_AUTOCONF;
+        port->ops               = &atmel_pops;
+        port->fifosize          = 1;
+        port->line              = data->num;
+        port->dev               = &pdev->dev;
+        port->mapbase   = pdev->resource[0].start;
+        port->irq       = pdev->resource[1].start;
+
+        tasklet_init(&atmel_port->tasklet, atmel_tasklet_func,
+                        (unsigned long)port);
+
+        memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
+
+        if (data->regs)
+                /* Already mapped by setup code */
+                port->membase = data->regs;
+        else {
+                port->flags     |= UPF_IOREMAP;
+                port->membase   = NULL;
+        }
+
+        /* for console, the clock could already be configured */
+        if (!atmel_port->clk) {
+                atmel_port->clk = clk_get(&pdev->dev, "usart");
+                clk_enable(atmel_port->clk);
+                port->uartclk = clk_get_rate(atmel_port->clk);
+                clk_disable(atmel_port->clk);
+                /* only enable clock when USART is in use */
+        }
+
+        atmel_port->use_dma_rx = data->use_dma_rx;
+        atmel_port->use_dma_tx = data->use_dma_tx;
+        atmel_port->rs485       = data->rs485;
+        /* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
+        if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+                atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
+        else if (atmel_use_dma_tx(port)) {
+                port->fifosize = PDC_BUFFER_SIZE;
+                atmel_port->tx_done_mask = ATMEL_US_ENDTX | ATMEL_US_TXBUFE;
+        } else {
+                atmel_port->tx_done_mask = ATMEL_US_TXRDY;
+        }
+}
+
+/*
+ * Register board-specific modem-control line handlers.
+ */
+void __init atmel_register_uart_fns(struct atmel_port_fns *fns)
+{
+        if (fns->enable_ms)
+                atmel_pops.enable_ms = fns->enable_ms;
+        if (fns->get_mctrl)
+                atmel_pops.get_mctrl = fns->get_mctrl;
+        if (fns->set_mctrl)
+                atmel_pops.set_mctrl = fns->set_mctrl;
+        atmel_open_hook         = fns->open;
+        atmel_close_hook        = fns->close;
+        atmel_pops.pm           = fns->pm;
+        atmel_pops.set_wake     = fns->set_wake;
+}
+
+#ifdef CONFIG_SERIAL_ATMEL_CONSOLE
+static void atmel_console_putchar(struct uart_port *port, int ch)
+{
+        while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
+                cpu_relax();
+        UART_PUT_CHAR(port, ch);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void atmel_console_write(struct console *co, const char *s, u_int count)
+{
+        struct uart_port *port = &atmel_ports[co->index].uart;
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        unsigned int status, imr;
+        unsigned int pdc_tx;
+
+        /*
+         * First, save IMR and then disable interrupts
+         */
+        imr = UART_GET_IMR(port);
+        UART_PUT_IDR(port, ATMEL_US_RXRDY | atmel_port->tx_done_mask);
+
+        /* Store PDC transmit status and disable it */
+        pdc_tx = UART_GET_PTSR(port) & ATMEL_PDC_TXTEN;
+        UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+
+        uart_console_write(port, s, count, atmel_console_putchar);
+
+        /*
+         * Finally, wait for transmitter to become empty
+         * and restore IMR
+         */
+        do {
+                status = UART_GET_CSR(port);
+        } while (!(status & ATMEL_US_TXRDY));
+
+        /* Restore PDC transmit status */
+        if (pdc_tx)
+                UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
+
+        /* set interrupts back the way they were */
+        UART_PUT_IER(port, imr);
+}
+
+/*
+ * If the port was already initialised (eg, by a boot loader),
+ * try to determine the current setup.
+ */
+static void __init atmel_console_get_options(struct uart_port *port, int *baud,
+                                             int *parity, int *bits)
+{
+        unsigned int mr, quot;
+
+        /*
+         * If the baud rate generator isn't running, the port wasn't
+         * initialized by the boot loader.
+         */
+        quot = UART_GET_BRGR(port) & ATMEL_US_CD;
+        if (!quot)
+                return;
+
+        mr = UART_GET_MR(port) & ATMEL_US_CHRL;
+        if (mr == ATMEL_US_CHRL_8)
+                *bits = 8;
+        else
+                *bits = 7;
+
+        mr = UART_GET_MR(port) & ATMEL_US_PAR;
+        if (mr == ATMEL_US_PAR_EVEN)
+                *parity = 'e';
+        else if (mr == ATMEL_US_PAR_ODD)
+                *parity = 'o';
+
+        /*
+         * The serial core only rounds down when matching this to a
+         * supported baud rate. Make sure we don't end up slightly
+         * lower than one of those, as it would make us fall through
+         * to a much lower baud rate than we really want.
+         */
+        *baud = port->uartclk / (16 * (quot - 1));
+}
+
+static int __init atmel_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port = &atmel_ports[co->index].uart;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (port->membase == NULL) {
+                /* Port not initialized yet - delay setup */
+                return -ENODEV;
+        }
+
+        clk_enable(atmel_ports[co->index].clk);
+
+        UART_PUT_IDR(port, -1);
+        UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
+        UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                atmel_console_get_options(port, &baud, &parity, &bits);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver atmel_uart;
+
+static struct console atmel_console = {
+        .name           = ATMEL_DEVICENAME,
+        .write          = atmel_console_write,
+        .device         = uart_console_device,
+        .setup          = atmel_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &atmel_uart,
+};
+
+#define ATMEL_CONSOLE_DEVICE    (&atmel_console)
+
+/*
+ * Early console initialization (before VM subsystem initialized).
+ */
+static int __init atmel_console_init(void)
+{
+        if (atmel_default_console_device) {
+                add_preferred_console(ATMEL_DEVICENAME,
+                                      atmel_default_console_device->id, NULL);
+                atmel_init_port(&atmel_ports[atmel_default_console_device->id],
+                                atmel_default_console_device);
+                register_console(&atmel_console);
+        }
+
+        return 0;
+}
+
+console_initcall(atmel_console_init);
+
+/*
+ * Late console initialization.
+ */
+static int __init atmel_late_console_init(void)
+{
+        if (atmel_default_console_device
+            && !(atmel_console.flags & CON_ENABLED))
+                register_console(&atmel_console);
+
+        return 0;
+}
+
+core_initcall(atmel_late_console_init);
+
+static inline bool atmel_is_console_port(struct uart_port *port)
+{
+        return port->cons && port->cons->index == port->line;
+}
+
+#else
+#define ATMEL_CONSOLE_DEVICE    NULL
+
+static inline bool atmel_is_console_port(struct uart_port *port)
+{
+        return false;
+}
+#endif
+
+static struct uart_driver atmel_uart = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "atmel_serial",
+        .dev_name       = ATMEL_DEVICENAME,
+        .major          = SERIAL_ATMEL_MAJOR,
+        .minor          = MINOR_START,
+        .nr             = ATMEL_MAX_UART,
+        .cons           = ATMEL_CONSOLE_DEVICE,
+};
+
+#ifdef CONFIG_PM
+static bool atmel_serial_clk_will_stop(void)
+{
+#ifdef CONFIG_ARCH_AT91
+        return at91_suspend_entering_slow_clock();
+#else
+        return false;
+#endif
+}
+
+static int atmel_serial_suspend(struct platform_device *pdev,
+                                pm_message_t state)
+{
+        struct uart_port *port = platform_get_drvdata(pdev);
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        if (atmel_is_console_port(port) && console_suspend_enabled) {
+                /* Drain the TX shifter */
+                while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY))
+                        cpu_relax();
+        }
+
+        /* we can not wake up if we're running on slow clock */
+        atmel_port->may_wakeup = device_may_wakeup(&pdev->dev);
+        if (atmel_serial_clk_will_stop())
+                device_set_wakeup_enable(&pdev->dev, 0);
+
+        uart_suspend_port(&atmel_uart, port);
+
+        return 0;
+}
+
+static int atmel_serial_resume(struct platform_device *pdev)
+{
+        struct uart_port *port = platform_get_drvdata(pdev);
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+
+        uart_resume_port(&atmel_uart, port);
+        device_set_wakeup_enable(&pdev->dev, atmel_port->may_wakeup);
+
+        return 0;
+}
+#else
+#define atmel_serial_suspend NULL
+#define atmel_serial_resume NULL
+#endif
+
+static int __devinit atmel_serial_probe(struct platform_device *pdev)
+{
+        struct atmel_uart_port *port;
+        struct atmel_uart_data *pdata = pdev->dev.platform_data;
+        void *data;
+        int ret;
+
+        BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
+
+        port = &atmel_ports[pdata->num];
+        port->backup_imr = 0;
+
+        atmel_init_port(port, pdev);
+
+        if (!atmel_use_dma_rx(&port->uart)) {
+                ret = -ENOMEM;
+                data = kmalloc(sizeof(struct atmel_uart_char)
+                                * ATMEL_SERIAL_RINGSIZE, GFP_KERNEL);
+                if (!data)
+                        goto err_alloc_ring;
+                port->rx_ring.buf = data;
+        }
+
+        ret = uart_add_one_port(&atmel_uart, &port->uart);
+        if (ret)
+                goto err_add_port;
+
+#ifdef CONFIG_SERIAL_ATMEL_CONSOLE
+        if (atmel_is_console_port(&port->uart)
+                        && ATMEL_CONSOLE_DEVICE->flags & CON_ENABLED) {
+                /*
+                 * The serial core enabled the clock for us, so undo
+                 * the clk_enable() in atmel_console_setup()
+                 */
+                clk_disable(port->clk);
+        }
+#endif
+
+        device_init_wakeup(&pdev->dev, 1);
+        platform_set_drvdata(pdev, port);
+
+        if (port->rs485.flags & SER_RS485_ENABLED) {
+                UART_PUT_MR(&port->uart, ATMEL_US_USMODE_NORMAL);
+                UART_PUT_CR(&port->uart, ATMEL_US_RTSEN);
+        }
+
+        return 0;
+
+err_add_port:
+        kfree(port->rx_ring.buf);
+        port->rx_ring.buf = NULL;
+err_alloc_ring:
+        if (!atmel_is_console_port(&port->uart)) {
+                clk_put(port->clk);
+                port->clk = NULL;
+        }
+
+        return ret;
+}
+
+static int __devexit atmel_serial_remove(struct platform_device *pdev)
+{
+        struct uart_port *port = platform_get_drvdata(pdev);
+        struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+        int ret = 0;
+
+        device_init_wakeup(&pdev->dev, 0);
+        platform_set_drvdata(pdev, NULL);
+
+        ret = uart_remove_one_port(&atmel_uart, port);
+
+        tasklet_kill(&atmel_port->tasklet);
+        kfree(atmel_port->rx_ring.buf);
+
+        /* "port" is allocated statically, so we shouldn't free it */
+
+        clk_put(atmel_port->clk);
+
+        return ret;
+}
+
+static struct platform_driver atmel_serial_driver = {
+        .probe          = atmel_serial_probe,
+        .remove         = __devexit_p(atmel_serial_remove),
+        .suspend        = atmel_serial_suspend,
+        .resume         = atmel_serial_resume,
+        .driver         = {
+                .name   = "atmel_usart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init atmel_serial_init(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&atmel_uart);
+        if (ret)
+                return ret;
+
+        ret = platform_driver_register(&atmel_serial_driver);
+        if (ret)
+                uart_unregister_driver(&atmel_uart);
+
+        return ret;
+}
+
+static void __exit atmel_serial_exit(void)
+{
+        platform_driver_unregister(&atmel_serial_driver);
+        uart_unregister_driver(&atmel_uart);
+}
+
+module_init(atmel_serial_init);
+module_exit(atmel_serial_exit);
+
+MODULE_AUTHOR("Rick Bronson");
+MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel_usart");
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
new file mode 100644
index 000000000000..c0b68b9cad91
--- /dev/null
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -0,0 +1,901 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Derived from many drivers using generic_serial interface.
+ *
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ *
+ *  Serial driver for BCM63xx integrated UART.
+ *
+ * Hardware flow control was _not_ tested since I only have RX/TX on
+ * my board.
+ */
+
+#if defined(CONFIG_SERIAL_BCM63XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/clk.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/sysrq.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+
+#include <bcm63xx_clk.h>
+#include <bcm63xx_irq.h>
+#include <bcm63xx_regs.h>
+#include <bcm63xx_io.h>
+
+#define BCM63XX_NR_UARTS        2
+
+static struct uart_port ports[BCM63XX_NR_UARTS];
+
+/*
+ * rx interrupt mask / stat
+ *
+ * mask:
+ *  - rx fifo full
+ *  - rx fifo above threshold
+ *  - rx fifo not empty for too long
+ */
+#define UART_RX_INT_MASK        (UART_IR_MASK(UART_IR_RXOVER) |         \
+                                UART_IR_MASK(UART_IR_RXTHRESH) |        \
+                                UART_IR_MASK(UART_IR_RXTIMEOUT))
+
+#define UART_RX_INT_STAT        (UART_IR_STAT(UART_IR_RXOVER) |         \
+                                UART_IR_STAT(UART_IR_RXTHRESH) |        \
+                                UART_IR_STAT(UART_IR_RXTIMEOUT))
+
+/*
+ * tx interrupt mask / stat
+ *
+ * mask:
+ * - tx fifo empty
+ * - tx fifo below threshold
+ */
+#define UART_TX_INT_MASK        (UART_IR_MASK(UART_IR_TXEMPTY) |        \
+                                UART_IR_MASK(UART_IR_TXTRESH))
+
+#define UART_TX_INT_STAT        (UART_IR_STAT(UART_IR_TXEMPTY) |        \
+                                UART_IR_STAT(UART_IR_TXTRESH))
+
+/*
+ * external input interrupt
+ *
+ * mask: any edge on CTS, DCD
+ */
+#define UART_EXTINP_INT_MASK    (UART_EXTINP_IRMASK(UART_EXTINP_IR_CTS) | \
+                                 UART_EXTINP_IRMASK(UART_EXTINP_IR_DCD))
+
+/*
+ * handy uart register accessor
+ */
+static inline unsigned int bcm_uart_readl(struct uart_port *port,
+                                         unsigned int offset)
+{
+        return bcm_readl(port->membase + offset);
+}
+
+static inline void bcm_uart_writel(struct uart_port *port,
+                                  unsigned int value, unsigned int offset)
+{
+        bcm_writel(value, port->membase + offset);
+}
+
+/*
+ * serial core request to check if uart tx fifo is empty
+ */
+static unsigned int bcm_uart_tx_empty(struct uart_port *port)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_IR_REG);
+        return (val & UART_IR_STAT(UART_IR_TXEMPTY)) ? 1 : 0;
+}
+
+/*
+ * serial core request to set RTS and DTR pin state and loopback mode
+ */
+static void bcm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_MCTL_REG);
+        val &= ~(UART_MCTL_DTR_MASK | UART_MCTL_RTS_MASK);
+        /* invert of written value is reflected on the pin */
+        if (!(mctrl & TIOCM_DTR))
+                val |= UART_MCTL_DTR_MASK;
+        if (!(mctrl & TIOCM_RTS))
+                val |= UART_MCTL_RTS_MASK;
+        bcm_uart_writel(port, val, UART_MCTL_REG);
+
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        if (mctrl & TIOCM_LOOP)
+                val |= UART_CTL_LOOPBACK_MASK;
+        else
+                val &= ~UART_CTL_LOOPBACK_MASK;
+        bcm_uart_writel(port, val, UART_CTL_REG);
+}
+
+/*
+ * serial core request to return RI, CTS, DCD and DSR pin state
+ */
+static unsigned int bcm_uart_get_mctrl(struct uart_port *port)
+{
+        unsigned int val, mctrl;
+
+        mctrl = 0;
+        val = bcm_uart_readl(port, UART_EXTINP_REG);
+        if (val & UART_EXTINP_RI_MASK)
+                mctrl |= TIOCM_RI;
+        if (val & UART_EXTINP_CTS_MASK)
+                mctrl |= TIOCM_CTS;
+        if (val & UART_EXTINP_DCD_MASK)
+                mctrl |= TIOCM_CD;
+        if (val & UART_EXTINP_DSR_MASK)
+                mctrl |= TIOCM_DSR;
+        return mctrl;
+}
+
+/*
+ * serial core request to disable tx ASAP (used for flow control)
+ */
+static void bcm_uart_stop_tx(struct uart_port *port)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        val &= ~(UART_CTL_TXEN_MASK);
+        bcm_uart_writel(port, val, UART_CTL_REG);
+
+        val = bcm_uart_readl(port, UART_IR_REG);
+        val &= ~UART_TX_INT_MASK;
+        bcm_uart_writel(port, val, UART_IR_REG);
+}
+
+/*
+ * serial core request to (re)enable tx
+ */
+static void bcm_uart_start_tx(struct uart_port *port)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_IR_REG);
+        val |= UART_TX_INT_MASK;
+        bcm_uart_writel(port, val, UART_IR_REG);
+
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        val |= UART_CTL_TXEN_MASK;
+        bcm_uart_writel(port, val, UART_CTL_REG);
+}
+
+/*
+ * serial core request to stop rx, called before port shutdown
+ */
+static void bcm_uart_stop_rx(struct uart_port *port)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_IR_REG);
+        val &= ~UART_RX_INT_MASK;
+        bcm_uart_writel(port, val, UART_IR_REG);
+}
+
+/*
+ * serial core request to enable modem status interrupt reporting
+ */
+static void bcm_uart_enable_ms(struct uart_port *port)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_IR_REG);
+        val |= UART_IR_MASK(UART_IR_EXTIP);
+        bcm_uart_writel(port, val, UART_IR_REG);
+}
+
+/*
+ * serial core request to start/stop emitting break char
+ */
+static void bcm_uart_break_ctl(struct uart_port *port, int ctl)
+{
+        unsigned long flags;
+        unsigned int val;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        if (ctl)
+                val |= UART_CTL_XMITBRK_MASK;
+        else
+                val &= ~UART_CTL_XMITBRK_MASK;
+        bcm_uart_writel(port, val, UART_CTL_REG);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*
+ * return port type in string format
+ */
+static const char *bcm_uart_type(struct uart_port *port)
+{
+        return (port->type == PORT_BCM63XX) ? "bcm63xx_uart" : NULL;
+}
+
+/*
+ * read all chars in rx fifo and send them to core
+ */
+static void bcm_uart_do_rx(struct uart_port *port)
+{
+        struct tty_struct *tty;
+        unsigned int max_count;
+
+        /* limit number of char read in interrupt, should not be
+         * higher than fifo size anyway since we're much faster than
+         * serial port */
+        max_count = 32;
+        tty = port->state->port.tty;
+        do {
+                unsigned int iestat, c, cstat;
+                char flag;
+
+                /* get overrun/fifo empty information from ier
+                 * register */
+                iestat = bcm_uart_readl(port, UART_IR_REG);
+
+                if (unlikely(iestat & UART_IR_STAT(UART_IR_RXOVER))) {
+                        unsigned int val;
+
+                        /* fifo reset is required to clear
+                         * interrupt */
+                        val = bcm_uart_readl(port, UART_CTL_REG);
+                        val |= UART_CTL_RSTRXFIFO_MASK;
+                        bcm_uart_writel(port, val, UART_CTL_REG);
+
+                        port->icount.overrun++;
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                }
+
+                if (!(iestat & UART_IR_STAT(UART_IR_RXNOTEMPTY)))
+                        break;
+
+                cstat = c = bcm_uart_readl(port, UART_FIFO_REG);
+                port->icount.rx++;
+                flag = TTY_NORMAL;
+                c &= 0xff;
+
+                if (unlikely((cstat & UART_FIFO_ANYERR_MASK))) {
+                        /* do stats first */
+                        if (cstat & UART_FIFO_BRKDET_MASK) {
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        continue;
+                        }
+
+                        if (cstat & UART_FIFO_PARERR_MASK)
+                                port->icount.parity++;
+                        if (cstat & UART_FIFO_FRAMEERR_MASK)
+                                port->icount.frame++;
+
+                        /* update flag wrt read_status_mask */
+                        cstat &= port->read_status_mask;
+                        if (cstat & UART_FIFO_BRKDET_MASK)
+                                flag = TTY_BREAK;
+                        if (cstat & UART_FIFO_FRAMEERR_MASK)
+                                flag = TTY_FRAME;
+                        if (cstat & UART_FIFO_PARERR_MASK)
+                                flag = TTY_PARITY;
+                }
+
+                if (uart_handle_sysrq_char(port, c))
+                        continue;
+
+
+                if ((cstat & port->ignore_status_mask) == 0)
+                        tty_insert_flip_char(tty, c, flag);
+
+        } while (--max_count);
+
+        tty_flip_buffer_push(tty);
+}
+
+/*
+ * fill tx fifo with chars to send, stop when fifo is about to be full
+ * or when all chars have been sent.
+ */
+static void bcm_uart_do_tx(struct uart_port *port)
+{
+        struct circ_buf *xmit;
+        unsigned int val, max_count;
+
+        if (port->x_char) {
+                bcm_uart_writel(port, port->x_char, UART_FIFO_REG);
+                port->icount.tx++;
+                port->x_char = 0;
+                return;
+        }
+
+        if (uart_tx_stopped(port)) {
+                bcm_uart_stop_tx(port);
+                return;
+        }
+
+        xmit = &port->state->xmit;
+        if (uart_circ_empty(xmit))
+                goto txq_empty;
+
+        val = bcm_uart_readl(port, UART_MCTL_REG);
+        val = (val & UART_MCTL_TXFIFOFILL_MASK) >> UART_MCTL_TXFIFOFILL_SHIFT;
+        max_count = port->fifosize - val;
+
+        while (max_count--) {
+                unsigned int c;
+
+                c = xmit->buf[xmit->tail];
+                bcm_uart_writel(port, c, UART_FIFO_REG);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                goto txq_empty;
+        return;
+
+txq_empty:
+        /* nothing to send, disable transmit interrupt */
+        val = bcm_uart_readl(port, UART_IR_REG);
+        val &= ~UART_TX_INT_MASK;
+        bcm_uart_writel(port, val, UART_IR_REG);
+        return;
+}
+
+/*
+ * process uart interrupt
+ */
+static irqreturn_t bcm_uart_interrupt(int irq, void *dev_id)
+{
+        struct uart_port *port;
+        unsigned int irqstat;
+
+        port = dev_id;
+        spin_lock(&port->lock);
+
+        irqstat = bcm_uart_readl(port, UART_IR_REG);
+        if (irqstat & UART_RX_INT_STAT)
+                bcm_uart_do_rx(port);
+
+        if (irqstat & UART_TX_INT_STAT)
+                bcm_uart_do_tx(port);
+
+        if (irqstat & UART_IR_MASK(UART_IR_EXTIP)) {
+                unsigned int estat;
+
+                estat = bcm_uart_readl(port, UART_EXTINP_REG);
+                if (estat & UART_EXTINP_IRSTAT(UART_EXTINP_IR_CTS))
+                        uart_handle_cts_change(port,
+                                               estat & UART_EXTINP_CTS_MASK);
+                if (estat & UART_EXTINP_IRSTAT(UART_EXTINP_IR_DCD))
+                        uart_handle_dcd_change(port,
+                                               estat & UART_EXTINP_DCD_MASK);
+        }
+
+        spin_unlock(&port->lock);
+        return IRQ_HANDLED;
+}
+
+/*
+ * enable rx & tx operation on uart
+ */
+static void bcm_uart_enable(struct uart_port *port)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        val |= (UART_CTL_BRGEN_MASK | UART_CTL_TXEN_MASK | UART_CTL_RXEN_MASK);
+        bcm_uart_writel(port, val, UART_CTL_REG);
+}
+
+/*
+ * disable rx & tx operation on uart
+ */
+static void bcm_uart_disable(struct uart_port *port)
+{
+        unsigned int val;
+
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        val &= ~(UART_CTL_BRGEN_MASK | UART_CTL_TXEN_MASK |
+                 UART_CTL_RXEN_MASK);
+        bcm_uart_writel(port, val, UART_CTL_REG);
+}
+
+/*
+ * clear all unread data in rx fifo and unsent data in tx fifo
+ */
+static void bcm_uart_flush(struct uart_port *port)
+{
+        unsigned int val;
+
+        /* empty rx and tx fifo */
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        val |= UART_CTL_RSTRXFIFO_MASK | UART_CTL_RSTTXFIFO_MASK;
+        bcm_uart_writel(port, val, UART_CTL_REG);
+
+        /* read any pending char to make sure all irq status are
+         * cleared */
+        (void)bcm_uart_readl(port, UART_FIFO_REG);
+}
+
+/*
+ * serial core request to initialize uart and start rx operation
+ */
+static int bcm_uart_startup(struct uart_port *port)
+{
+        unsigned int val;
+        int ret;
+
+        /* mask all irq and flush port */
+        bcm_uart_disable(port);
+        bcm_uart_writel(port, 0, UART_IR_REG);
+        bcm_uart_flush(port);
+
+        /* clear any pending external input interrupt */
+        (void)bcm_uart_readl(port, UART_EXTINP_REG);
+
+        /* set rx/tx fifo thresh to fifo half size */
+        val = bcm_uart_readl(port, UART_MCTL_REG);
+        val &= ~(UART_MCTL_RXFIFOTHRESH_MASK | UART_MCTL_TXFIFOTHRESH_MASK);
+        val |= (port->fifosize / 2) << UART_MCTL_RXFIFOTHRESH_SHIFT;
+        val |= (port->fifosize / 2) << UART_MCTL_TXFIFOTHRESH_SHIFT;
+        bcm_uart_writel(port, val, UART_MCTL_REG);
+
+        /* set rx fifo timeout to 1 char time */
+        val = bcm_uart_readl(port, UART_CTL_REG);
+        val &= ~UART_CTL_RXTMOUTCNT_MASK;
+        val |= 1 << UART_CTL_RXTMOUTCNT_SHIFT;
+        bcm_uart_writel(port, val, UART_CTL_REG);
+
+        /* report any edge on dcd and cts */
+        val = UART_EXTINP_INT_MASK;
+        val |= UART_EXTINP_DCD_NOSENSE_MASK;
+        val |= UART_EXTINP_CTS_NOSENSE_MASK;
+        bcm_uart_writel(port, val, UART_EXTINP_REG);
+
+        /* register irq and enable rx interrupts */
+        ret = request_irq(port->irq, bcm_uart_interrupt, 0,
+                          bcm_uart_type(port), port);
+        if (ret)
+                return ret;
+        bcm_uart_writel(port, UART_RX_INT_MASK, UART_IR_REG);
+        bcm_uart_enable(port);
+        return 0;
+}
+
+/*
+ * serial core request to flush & disable uart
+ */
+static void bcm_uart_shutdown(struct uart_port *port)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        bcm_uart_writel(port, 0, UART_IR_REG);
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        bcm_uart_disable(port);
+        bcm_uart_flush(port);
+        free_irq(port->irq, port);
+}
+
+/*
+ * serial core request to change current uart setting
+ */
+static void bcm_uart_set_termios(struct uart_port *port,
+                                 struct ktermios *new,
+                                 struct ktermios *old)
+{
+        unsigned int ctl, baud, quot, ier;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* disable uart while changing speed */
+        bcm_uart_disable(port);
+        bcm_uart_flush(port);
+
+        /* update Control register */
+        ctl = bcm_uart_readl(port, UART_CTL_REG);
+        ctl &= ~UART_CTL_BITSPERSYM_MASK;
+
+        switch (new->c_cflag & CSIZE) {
+        case CS5:
+                ctl |= (0 << UART_CTL_BITSPERSYM_SHIFT);
+                break;
+        case CS6:
+                ctl |= (1 << UART_CTL_BITSPERSYM_SHIFT);
+                break;
+        case CS7:
+                ctl |= (2 << UART_CTL_BITSPERSYM_SHIFT);
+                break;
+        default:
+                ctl |= (3 << UART_CTL_BITSPERSYM_SHIFT);
+                break;
+        }
+
+        ctl &= ~UART_CTL_STOPBITS_MASK;
+        if (new->c_cflag & CSTOPB)
+                ctl |= UART_CTL_STOPBITS_2;
+        else
+                ctl |= UART_CTL_STOPBITS_1;
+
+        ctl &= ~(UART_CTL_RXPAREN_MASK | UART_CTL_TXPAREN_MASK);
+        if (new->c_cflag & PARENB)
+                ctl |= (UART_CTL_RXPAREN_MASK | UART_CTL_TXPAREN_MASK);
+        ctl &= ~(UART_CTL_RXPAREVEN_MASK | UART_CTL_TXPAREVEN_MASK);
+        if (new->c_cflag & PARODD)
+                ctl |= (UART_CTL_RXPAREVEN_MASK | UART_CTL_TXPAREVEN_MASK);
+        bcm_uart_writel(port, ctl, UART_CTL_REG);
+
+        /* update Baudword register */
+        baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
+        quot = uart_get_divisor(port, baud) - 1;
+        bcm_uart_writel(port, quot, UART_BAUD_REG);
+
+        /* update Interrupt register */
+        ier = bcm_uart_readl(port, UART_IR_REG);
+
+        ier &= ~UART_IR_MASK(UART_IR_EXTIP);
+        if (UART_ENABLE_MS(port, new->c_cflag))
+                ier |= UART_IR_MASK(UART_IR_EXTIP);
+
+        bcm_uart_writel(port, ier, UART_IR_REG);
+
+        /* update read/ignore mask */
+        port->read_status_mask = UART_FIFO_VALID_MASK;
+        if (new->c_iflag & INPCK) {
+                port->read_status_mask |= UART_FIFO_FRAMEERR_MASK;
+                port->read_status_mask |= UART_FIFO_PARERR_MASK;
+        }
+        if (new->c_iflag & (BRKINT))
+                port->read_status_mask |= UART_FIFO_BRKDET_MASK;
+
+        port->ignore_status_mask = 0;
+        if (new->c_iflag & IGNPAR)
+                port->ignore_status_mask |= UART_FIFO_PARERR_MASK;
+        if (new->c_iflag & IGNBRK)
+                port->ignore_status_mask |= UART_FIFO_BRKDET_MASK;
+        if (!(new->c_cflag & CREAD))
+                port->ignore_status_mask |= UART_FIFO_VALID_MASK;
+
+        uart_update_timeout(port, new->c_cflag, baud);
+        bcm_uart_enable(port);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*
+ * serial core request to claim uart iomem
+ */
+static int bcm_uart_request_port(struct uart_port *port)
+{
+        unsigned int size;
+
+        size = RSET_UART_SIZE;
+        if (!request_mem_region(port->mapbase, size, "bcm63xx")) {
+                dev_err(port->dev, "Memory region busy\n");
+                return -EBUSY;
+        }
+
+        port->membase = ioremap(port->mapbase, size);
+        if (!port->membase) {
+                dev_err(port->dev, "Unable to map registers\n");
+                release_mem_region(port->mapbase, size);
+                return -EBUSY;
+        }
+        return 0;
+}
+
+/*
+ * serial core request to release uart iomem
+ */
+static void bcm_uart_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, RSET_UART_SIZE);
+        iounmap(port->membase);
+}
+
+/*
+ * serial core request to do any port required autoconfiguration
+ */
+static void bcm_uart_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                if (bcm_uart_request_port(port))
+                        return;
+                port->type = PORT_BCM63XX;
+        }
+}
+
+/*
+ * serial core request to check that port information in serinfo are
+ * suitable
+ */
+static int bcm_uart_verify_port(struct uart_port *port,
+                                struct serial_struct *serinfo)
+{
+        if (port->type != PORT_BCM63XX)
+                return -EINVAL;
+        if (port->irq != serinfo->irq)
+                return -EINVAL;
+        if (port->iotype != serinfo->io_type)
+                return -EINVAL;
+        if (port->mapbase != (unsigned long)serinfo->iomem_base)
+                return -EINVAL;
+        return 0;
+}
+
+/* serial core callbacks */
+static struct uart_ops bcm_uart_ops = {
+        .tx_empty       = bcm_uart_tx_empty,
+        .get_mctrl      = bcm_uart_get_mctrl,
+        .set_mctrl      = bcm_uart_set_mctrl,
+        .start_tx       = bcm_uart_start_tx,
+        .stop_tx        = bcm_uart_stop_tx,
+        .stop_rx        = bcm_uart_stop_rx,
+        .enable_ms      = bcm_uart_enable_ms,
+        .break_ctl      = bcm_uart_break_ctl,
+        .startup        = bcm_uart_startup,
+        .shutdown       = bcm_uart_shutdown,
+        .set_termios    = bcm_uart_set_termios,
+        .type           = bcm_uart_type,
+        .release_port   = bcm_uart_release_port,
+        .request_port   = bcm_uart_request_port,
+        .config_port    = bcm_uart_config_port,
+        .verify_port    = bcm_uart_verify_port,
+};
+
+
+
+#ifdef CONFIG_SERIAL_BCM63XX_CONSOLE
+static inline void wait_for_xmitr(struct uart_port *port)
+{
+        unsigned int tmout;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        tmout = 10000;
+        while (--tmout) {
+                unsigned int val;
+
+                val = bcm_uart_readl(port, UART_IR_REG);
+                if (val & UART_IR_STAT(UART_IR_TXEMPTY))
+                        break;
+                udelay(1);
+        }
+
+        /* Wait up to 1s for flow control if necessary */
+        if (port->flags & UPF_CONS_FLOW) {
+                tmout = 1000000;
+                while (--tmout) {
+                        unsigned int val;
+
+                        val = bcm_uart_readl(port, UART_EXTINP_REG);
+                        if (val & UART_EXTINP_CTS_MASK)
+                                break;
+                        udelay(1);
+                }
+        }
+}
+
+/*
+ * output given char
+ */
+static void bcm_console_putchar(struct uart_port *port, int ch)
+{
+        wait_for_xmitr(port);
+        bcm_uart_writel(port, ch, UART_FIFO_REG);
+}
+
+/*
+ * console core request to output given string
+ */
+static void bcm_console_write(struct console *co, const char *s,
+                              unsigned int count)
+{
+        struct uart_port *port;
+        unsigned long flags;
+        int locked;
+
+        port = &ports[co->index];
+
+        local_irq_save(flags);
+        if (port->sysrq) {
+                /* bcm_uart_interrupt() already took the lock */
+                locked = 0;
+        } else if (oops_in_progress) {
+                locked = spin_trylock(&port->lock);
+        } else {
+                spin_lock(&port->lock);
+                locked = 1;
+        }
+
+        /* call helper to deal with \r\n */
+        uart_console_write(port, s, count, bcm_console_putchar);
+
+        /* and wait for char to be transmitted */
+        wait_for_xmitr(port);
+
+        if (locked)
+                spin_unlock(&port->lock);
+        local_irq_restore(flags);
+}
+
+/*
+ * console core request to setup given console, find matching uart
+ * port and setup it.
+ */
+static int bcm_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (co->index < 0 || co->index >= BCM63XX_NR_UARTS)
+                return -EINVAL;
+        port = &ports[co->index];
+        if (!port->membase)
+                return -ENODEV;
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver bcm_uart_driver;
+
+static struct console bcm63xx_console = {
+        .name           = "ttyS",
+        .write          = bcm_console_write,
+        .device         = uart_console_device,
+        .setup          = bcm_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &bcm_uart_driver,
+};
+
+static int __init bcm63xx_console_init(void)
+{
+        register_console(&bcm63xx_console);
+        return 0;
+}
+
+console_initcall(bcm63xx_console_init);
+
+#define BCM63XX_CONSOLE (&bcm63xx_console)
+#else
+#define BCM63XX_CONSOLE NULL
+#endif /* CONFIG_SERIAL_BCM63XX_CONSOLE */
+
+static struct uart_driver bcm_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "bcm63xx_uart",
+        .dev_name       = "ttyS",
+        .major          = TTY_MAJOR,
+        .minor          = 64,
+        .nr             = BCM63XX_NR_UARTS,
+        .cons           = BCM63XX_CONSOLE,
+};
+
+/*
+ * platform driver probe/remove callback
+ */
+static int __devinit bcm_uart_probe(struct platform_device *pdev)
+{
+        struct resource *res_mem, *res_irq;
+        struct uart_port *port;
+        struct clk *clk;
+        int ret;
+
+        if (pdev->id < 0 || pdev->id >= BCM63XX_NR_UARTS)
+                return -EINVAL;
+
+        if (ports[pdev->id].membase)
+                return -EBUSY;
+
+        res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res_mem)
+                return -ENODEV;
+
+        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!res_irq)
+                return -ENODEV;
+
+        clk = clk_get(&pdev->dev, "periph");
+        if (IS_ERR(clk))
+                return -ENODEV;
+
+        port = &ports[pdev->id];
+        memset(port, 0, sizeof(*port));
+        port->iotype = UPIO_MEM;
+        port->mapbase = res_mem->start;
+        port->irq = res_irq->start;
+        port->ops = &bcm_uart_ops;
+        port->flags = UPF_BOOT_AUTOCONF;
+        port->dev = &pdev->dev;
+        port->fifosize = 16;
+        port->uartclk = clk_get_rate(clk) / 2;
+        port->line = pdev->id;
+        clk_put(clk);
+
+        ret = uart_add_one_port(&bcm_uart_driver, port);
+        if (ret) {
+                ports[pdev->id].membase = 0;
+                return ret;
+        }
+        platform_set_drvdata(pdev, port);
+        return 0;
+}
+
+static int __devexit bcm_uart_remove(struct platform_device *pdev)
+{
+        struct uart_port *port;
+
+        port = platform_get_drvdata(pdev);
+        uart_remove_one_port(&bcm_uart_driver, port);
+        platform_set_drvdata(pdev, NULL);
+        /* mark port as free */
+        ports[pdev->id].membase = 0;
+        return 0;
+}
+
+/*
+ * platform driver stuff
+ */
+static struct platform_driver bcm_uart_platform_driver = {
+        .probe  = bcm_uart_probe,
+        .remove = __devexit_p(bcm_uart_remove),
+        .driver = {
+                .owner = THIS_MODULE,
+                .name  = "bcm63xx_uart",
+        },
+};
+
+static int __init bcm_uart_init(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&bcm_uart_driver);
+        if (ret)
+                return ret;
+
+        ret = platform_driver_register(&bcm_uart_platform_driver);
+        if (ret)
+                uart_unregister_driver(&bcm_uart_driver);
+
+        return ret;
+}
+
+static void __exit bcm_uart_exit(void)
+{
+        platform_driver_unregister(&bcm_uart_platform_driver);
+        uart_unregister_driver(&bcm_uart_driver);
+}
+
+module_init(bcm_uart_init);
+module_exit(bcm_uart_exit);
+
+MODULE_AUTHOR("Maxime Bizon <mbizon@freebox.fr>");
+MODULE_DESCRIPTION("Broadcom 63<xx integrated uart driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/bfin_5xx.c b/drivers/tty/serial/bfin_5xx.c
new file mode 100644
index 000000000000..9b1ff2b6bb37
--- /dev/null
+++ b/drivers/tty/serial/bfin_5xx.c
@@ -0,0 +1,1597 @@
+/*
+ * Blackfin On-Chip Serial Driver
+ *
+ * Copyright 2006-2010 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#define DRIVER_NAME "bfin-uart"
+#define pr_fmt(fmt) DRIVER_NAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/gfp.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/kgdb.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/portmux.h>
+#include <asm/cacheflush.h>
+#include <asm/dma.h>
+
+#define port_membase(uart)     (((struct bfin_serial_port *)(uart))->port.membase)
+#define get_lsr_cache(uart)    (((struct bfin_serial_port *)(uart))->lsr)
+#define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v))
+#include <asm/bfin_serial.h>
+
+#ifdef CONFIG_SERIAL_BFIN_MODULE
+# undef CONFIG_EARLY_PRINTK
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_MODULE
+# undef CONFIG_EARLY_PRINTK
+#endif
+
+/* UART name and device definitions */
+#define BFIN_SERIAL_DEV_NAME    "ttyBF"
+#define BFIN_SERIAL_MAJOR       204
+#define BFIN_SERIAL_MINOR       64
+
+static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
+
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+        defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+
+# ifndef CONFIG_SERIAL_BFIN_PIO
+#  error KGDB only support UART in PIO mode.
+# endif
+
+static int kgdboc_port_line;
+static int kgdboc_break_enabled;
+#endif
+/*
+ * Setup for console. Argument comes from the menuconfig
+ */
+#define DMA_RX_XCOUNT           512
+#define DMA_RX_YCOUNT           (PAGE_SIZE / DMA_RX_XCOUNT)
+
+#define DMA_RX_FLUSH_JIFFIES    (HZ / 50)
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
+#else
+static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
+#endif
+
+static void bfin_serial_reset_irda(struct uart_port *port);
+
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+        defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
+static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        if (uart->cts_pin < 0)
+                return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+        /* CTS PIN is negative assertive. */
+        if (UART_GET_CTS(uart))
+                return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+        else
+                return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        if (uart->rts_pin < 0)
+                return;
+
+        /* RTS PIN is negative assertive. */
+        if (mctrl & TIOCM_RTS)
+                UART_ENABLE_RTS(uart);
+        else
+                UART_DISABLE_RTS(uart);
+}
+
+/*
+ * Handle any change of modem status signal.
+ */
+static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
+{
+        struct bfin_serial_port *uart = dev_id;
+        unsigned int status;
+
+        status = bfin_serial_get_mctrl(&uart->port);
+        uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+        uart->scts = 1;
+        UART_CLEAR_SCTS(uart);
+        UART_CLEAR_IER(uart, EDSSI);
+#endif
+
+        return IRQ_HANDLED;
+}
+#else
+static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+#endif
+
+/*
+ * interrupts are disabled on entry
+ */
+static void bfin_serial_stop_tx(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        struct circ_buf *xmit = &uart->port.state->xmit;
+#endif
+
+        while (!(UART_GET_LSR(uart) & TEMT))
+                cpu_relax();
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        disable_dma(uart->tx_dma_channel);
+        xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
+        uart->port.icount.tx += uart->tx_count;
+        uart->tx_count = 0;
+        uart->tx_done = 1;
+#else
+#ifdef CONFIG_BF54x
+        /* Clear TFI bit */
+        UART_PUT_LSR(uart, TFI);
+#endif
+        UART_CLEAR_IER(uart, ETBEI);
+#endif
+}
+
+/*
+ * port is locked and interrupts are disabled
+ */
+static void bfin_serial_start_tx(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        struct tty_struct *tty = uart->port.state->port.tty;
+
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+        if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
+                uart->scts = 0;
+                uart_handle_cts_change(&uart->port, uart->scts);
+        }
+#endif
+
+        /*
+         * To avoid losting RX interrupt, we reset IR function
+         * before sending data.
+         */
+        if (tty->termios->c_line == N_IRDA)
+                bfin_serial_reset_irda(port);
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        if (uart->tx_done)
+                bfin_serial_dma_tx_chars(uart);
+#else
+        UART_SET_IER(uart, ETBEI);
+        bfin_serial_tx_chars(uart);
+#endif
+}
+
+/*
+ * Interrupts are enabled
+ */
+static void bfin_serial_stop_rx(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+        UART_CLEAR_IER(uart, ERBFI);
+}
+
+/*
+ * Set the modem control timer to fire immediately.
+ */
+static void bfin_serial_enable_ms(struct uart_port *port)
+{
+}
+
+
+#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
+# define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
+# define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
+#else
+# define UART_GET_ANOMALY_THRESHOLD(uart)    0
+# define UART_SET_ANOMALY_THRESHOLD(uart, v)
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_PIO
+static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
+{
+        struct tty_struct *tty = NULL;
+        unsigned int status, ch, flg;
+        static struct timeval anomaly_start = { .tv_sec = 0 };
+
+        status = UART_GET_LSR(uart);
+        UART_CLEAR_LSR(uart);
+
+        ch = UART_GET_CHAR(uart);
+        uart->port.icount.rx++;
+
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+        defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+        if (kgdb_connected && kgdboc_port_line == uart->port.line
+                && kgdboc_break_enabled)
+                if (ch == 0x3) {/* Ctrl + C */
+                        kgdb_breakpoint();
+                        return;
+                }
+
+        if (!uart->port.state || !uart->port.state->port.tty)
+                return;
+#endif
+        tty = uart->port.state->port.tty;
+
+        if (ANOMALY_05000363) {
+                /* The BF533 (and BF561) family of processors have a nice anomaly
+                 * where they continuously generate characters for a "single" break.
+                 * We have to basically ignore this flood until the "next" valid
+                 * character comes across.  Due to the nature of the flood, it is
+                 * not possible to reliably catch bytes that are sent too quickly
+                 * after this break.  So application code talking to the Blackfin
+                 * which sends a break signal must allow at least 1.5 character
+                 * times after the end of the break for things to stabilize.  This
+                 * timeout was picked as it must absolutely be larger than 1
+                 * character time +/- some percent.  So 1.5 sounds good.  All other
+                 * Blackfin families operate properly.  Woo.
+                 */
+                if (anomaly_start.tv_sec) {
+                        struct timeval curr;
+                        suseconds_t usecs;
+
+                        if ((~ch & (~ch + 1)) & 0xff)
+                                goto known_good_char;
+
+                        do_gettimeofday(&curr);
+                        if (curr.tv_sec - anomaly_start.tv_sec > 1)
+                                goto known_good_char;
+
+                        usecs = 0;
+                        if (curr.tv_sec != anomaly_start.tv_sec)
+                                usecs += USEC_PER_SEC;
+                        usecs += curr.tv_usec - anomaly_start.tv_usec;
+
+                        if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
+                                goto known_good_char;
+
+                        if (ch)
+                                anomaly_start.tv_sec = 0;
+                        else
+                                anomaly_start = curr;
+
+                        return;
+
+ known_good_char:
+                        status &= ~BI;
+                        anomaly_start.tv_sec = 0;
+                }
+        }
+
+        if (status & BI) {
+                if (ANOMALY_05000363)
+                        if (bfin_revid() < 5)
+                                do_gettimeofday(&anomaly_start);
+                uart->port.icount.brk++;
+                if (uart_handle_break(&uart->port))
+                        goto ignore_char;
+                status &= ~(PE | FE);
+        }
+        if (status & PE)
+                uart->port.icount.parity++;
+        if (status & OE)
+                uart->port.icount.overrun++;
+        if (status & FE)
+                uart->port.icount.frame++;
+
+        status &= uart->port.read_status_mask;
+
+        if (status & BI)
+                flg = TTY_BREAK;
+        else if (status & PE)
+                flg = TTY_PARITY;
+        else if (status & FE)
+                flg = TTY_FRAME;
+        else
+                flg = TTY_NORMAL;
+
+        if (uart_handle_sysrq_char(&uart->port, ch))
+                goto ignore_char;
+
+        uart_insert_char(&uart->port, status, OE, ch, flg);
+
+ ignore_char:
+        tty_flip_buffer_push(tty);
+}
+
+static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
+{
+        struct circ_buf *xmit = &uart->port.state->xmit;
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
+#ifdef CONFIG_BF54x
+                /* Clear TFI bit */
+                UART_PUT_LSR(uart, TFI);
+#endif
+                /* Anomaly notes:
+                 *  05000215 -  we always clear ETBEI within last UART TX
+                 *              interrupt to end a string. It is always set
+                 *              when start a new tx.
+                 */
+                UART_CLEAR_IER(uart, ETBEI);
+                return;
+        }
+
+        if (uart->port.x_char) {
+                UART_PUT_CHAR(uart, uart->port.x_char);
+                uart->port.icount.tx++;
+                uart->port.x_char = 0;
+        }
+
+        while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
+                UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                uart->port.icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&uart->port);
+}
+
+static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
+{
+        struct bfin_serial_port *uart = dev_id;
+
+        while (UART_GET_LSR(uart) & DR)
+                bfin_serial_rx_chars(uart);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
+{
+        struct bfin_serial_port *uart = dev_id;
+
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+        if (uart->scts && !(bfin_serial_get_mctrl(&uart->port) & TIOCM_CTS)) {
+                uart->scts = 0;
+                uart_handle_cts_change(&uart->port, uart->scts);
+        }
+#endif
+        spin_lock(&uart->port.lock);
+        if (UART_GET_LSR(uart) & THRE)
+                bfin_serial_tx_chars(uart);
+        spin_unlock(&uart->port.lock);
+
+        return IRQ_HANDLED;
+}
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
+{
+        struct circ_buf *xmit = &uart->port.state->xmit;
+
+        uart->tx_done = 0;
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
+                uart->tx_count = 0;
+                uart->tx_done = 1;
+                return;
+        }
+
+        if (uart->port.x_char) {
+                UART_PUT_CHAR(uart, uart->port.x_char);
+                uart->port.icount.tx++;
+                uart->port.x_char = 0;
+        }
+
+        uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
+        if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
+                uart->tx_count = UART_XMIT_SIZE - xmit->tail;
+        blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
+                                        (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
+        set_dma_config(uart->tx_dma_channel,
+                set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
+                        INTR_ON_BUF,
+                        DIMENSION_LINEAR,
+                        DATA_SIZE_8,
+                        DMA_SYNC_RESTART));
+        set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
+        set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
+        set_dma_x_modify(uart->tx_dma_channel, 1);
+        SSYNC();
+        enable_dma(uart->tx_dma_channel);
+
+        UART_SET_IER(uart, ETBEI);
+}
+
+static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
+{
+        struct tty_struct *tty = uart->port.state->port.tty;
+        int i, flg, status;
+
+        status = UART_GET_LSR(uart);
+        UART_CLEAR_LSR(uart);
+
+        uart->port.icount.rx +=
+                CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
+                UART_XMIT_SIZE);
+
+        if (status & BI) {
+                uart->port.icount.brk++;
+                if (uart_handle_break(&uart->port))
+                        goto dma_ignore_char;
+                status &= ~(PE | FE);
+        }
+        if (status & PE)
+                uart->port.icount.parity++;
+        if (status & OE)
+                uart->port.icount.overrun++;
+        if (status & FE)
+                uart->port.icount.frame++;
+
+        status &= uart->port.read_status_mask;
+
+        if (status & BI)
+                flg = TTY_BREAK;
+        else if (status & PE)
+                flg = TTY_PARITY;
+        else if (status & FE)
+                flg = TTY_FRAME;
+        else
+                flg = TTY_NORMAL;
+
+        for (i = uart->rx_dma_buf.tail; ; i++) {
+                if (i >= UART_XMIT_SIZE)
+                        i = 0;
+                if (i == uart->rx_dma_buf.head)
+                        break;
+                if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
+                        uart_insert_char(&uart->port, status, OE,
+                                uart->rx_dma_buf.buf[i], flg);
+        }
+
+ dma_ignore_char:
+        tty_flip_buffer_push(tty);
+}
+
+void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart)
+{
+        int x_pos, pos;
+
+        dma_disable_irq_nosync(uart->rx_dma_channel);
+        spin_lock_bh(&uart->rx_lock);
+
+        /* 2D DMA RX buffer ring is used. Because curr_y_count and
+         * curr_x_count can't be read as an atomic operation,
+         * curr_y_count should be read before curr_x_count. When
+         * curr_x_count is read, curr_y_count may already indicate
+         * next buffer line. But, the position calculated here is
+         * still indicate the old line. The wrong position data may
+         * be smaller than current buffer tail, which cause garbages
+         * are received if it is not prohibit.
+         */
+        uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
+        x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
+        uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
+        if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
+                uart->rx_dma_nrows = 0;
+        x_pos = DMA_RX_XCOUNT - x_pos;
+        if (x_pos == DMA_RX_XCOUNT)
+                x_pos = 0;
+
+        pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
+        /* Ignore receiving data if new position is in the same line of
+         * current buffer tail and small.
+         */
+        if (pos > uart->rx_dma_buf.tail ||
+                uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
+                uart->rx_dma_buf.head = pos;
+                bfin_serial_dma_rx_chars(uart);
+                uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
+        }
+
+        spin_unlock_bh(&uart->rx_lock);
+        dma_enable_irq(uart->rx_dma_channel);
+
+        mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
+}
+
+static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
+{
+        struct bfin_serial_port *uart = dev_id;
+        struct circ_buf *xmit = &uart->port.state->xmit;
+
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+        if (uart->scts && !(bfin_serial_get_mctrl(&uart->port)&TIOCM_CTS)) {
+                uart->scts = 0;
+                uart_handle_cts_change(&uart->port, uart->scts);
+        }
+#endif
+
+        spin_lock(&uart->port.lock);
+        if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
+                disable_dma(uart->tx_dma_channel);
+                clear_dma_irqstat(uart->tx_dma_channel);
+                /* Anomaly notes:
+                 *  05000215 -  we always clear ETBEI within last UART TX
+                 *              interrupt to end a string. It is always set
+                 *              when start a new tx.
+                 */
+                UART_CLEAR_IER(uart, ETBEI);
+                xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
+                uart->port.icount.tx += uart->tx_count;
+
+                if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                        uart_write_wakeup(&uart->port);
+
+                bfin_serial_dma_tx_chars(uart);
+        }
+
+        spin_unlock(&uart->port.lock);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
+{
+        struct bfin_serial_port *uart = dev_id;
+        unsigned short irqstat;
+        int x_pos, pos;
+
+        spin_lock(&uart->rx_lock);
+        irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
+        clear_dma_irqstat(uart->rx_dma_channel);
+
+        uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
+        x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
+        uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
+        if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
+                uart->rx_dma_nrows = 0;
+
+        pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
+        if (pos > uart->rx_dma_buf.tail ||
+                uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
+                uart->rx_dma_buf.head = pos;
+                bfin_serial_dma_rx_chars(uart);
+                uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
+        }
+
+        spin_unlock(&uart->rx_lock);
+
+        return IRQ_HANDLED;
+}
+#endif
+
+/*
+ * Return TIOCSER_TEMT when transmitter is not busy.
+ */
+static unsigned int bfin_serial_tx_empty(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        unsigned short lsr;
+
+        lsr = UART_GET_LSR(uart);
+        if (lsr & TEMT)
+                return TIOCSER_TEMT;
+        else
+                return 0;
+}
+
+static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        u16 lcr = UART_GET_LCR(uart);
+        if (break_state)
+                lcr |= SB;
+        else
+                lcr &= ~SB;
+        UART_PUT_LCR(uart, lcr);
+        SSYNC();
+}
+
+static int bfin_serial_startup(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        dma_addr_t dma_handle;
+
+        if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
+                printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
+                return -EBUSY;
+        }
+
+        if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
+                printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
+                free_dma(uart->rx_dma_channel);
+                return -EBUSY;
+        }
+
+        set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
+        set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
+
+        uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
+        uart->rx_dma_buf.head = 0;
+        uart->rx_dma_buf.tail = 0;
+        uart->rx_dma_nrows = 0;
+
+        set_dma_config(uart->rx_dma_channel,
+                set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
+                                INTR_ON_ROW, DIMENSION_2D,
+                                DATA_SIZE_8,
+                                DMA_SYNC_RESTART));
+        set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
+        set_dma_x_modify(uart->rx_dma_channel, 1);
+        set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
+        set_dma_y_modify(uart->rx_dma_channel, 1);
+        set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
+        enable_dma(uart->rx_dma_channel);
+
+        uart->rx_dma_timer.data = (unsigned long)(uart);
+        uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout;
+        uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
+        add_timer(&(uart->rx_dma_timer));
+#else
+# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+        defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+        if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
+                kgdboc_break_enabled = 0;
+        else {
+# endif
+        if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
+             "BFIN_UART_RX", uart)) {
+                printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
+                return -EBUSY;
+        }
+
+        if (request_irq
+            (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
+             "BFIN_UART_TX", uart)) {
+                printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
+                free_irq(uart->port.irq, uart);
+                return -EBUSY;
+        }
+
+# ifdef CONFIG_BF54x
+        {
+                /*
+                 * UART2 and UART3 on BF548 share interrupt PINs and DMA
+                 * controllers with SPORT2 and SPORT3. UART rx and tx
+                 * interrupts are generated in PIO mode only when configure
+                 * their peripheral mapping registers properly, which means
+                 * request corresponding DMA channels in PIO mode as well.
+                 */
+                unsigned uart_dma_ch_rx, uart_dma_ch_tx;
+
+                switch (uart->port.irq) {
+                case IRQ_UART3_RX:
+                        uart_dma_ch_rx = CH_UART3_RX;
+                        uart_dma_ch_tx = CH_UART3_TX;
+                        break;
+                case IRQ_UART2_RX:
+                        uart_dma_ch_rx = CH_UART2_RX;
+                        uart_dma_ch_tx = CH_UART2_TX;
+                        break;
+                default:
+                        uart_dma_ch_rx = uart_dma_ch_tx = 0;
+                        break;
+                };
+
+                if (uart_dma_ch_rx &&
+                        request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
+                        printk(KERN_NOTICE"Fail to attach UART interrupt\n");
+                        free_irq(uart->port.irq, uart);
+                        free_irq(uart->port.irq + 1, uart);
+                        return -EBUSY;
+                }
+                if (uart_dma_ch_tx &&
+                        request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
+                        printk(KERN_NOTICE "Fail to attach UART interrupt\n");
+                        free_dma(uart_dma_ch_rx);
+                        free_irq(uart->port.irq, uart);
+                        free_irq(uart->port.irq + 1, uart);
+                        return -EBUSY;
+                }
+        }
+# endif
+# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+        defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+        }
+# endif
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+        if (uart->cts_pin >= 0) {
+                if (request_irq(gpio_to_irq(uart->cts_pin),
+                        bfin_serial_mctrl_cts_int,
+                        IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                        IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
+                        uart->cts_pin = -1;
+                        pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
+                }
+        }
+        if (uart->rts_pin >= 0) {
+                gpio_direction_output(uart->rts_pin, 0);
+        }
+#endif
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+        if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
+                bfin_serial_mctrl_cts_int,
+                IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
+                uart->cts_pin = -1;
+                pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
+        }
+
+        /* CTS RTS PINs are negative assertive. */
+        UART_PUT_MCR(uart, ACTS);
+        UART_SET_IER(uart, EDSSI);
+#endif
+
+        UART_SET_IER(uart, ERBFI);
+        return 0;
+}
+
+static void bfin_serial_shutdown(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+        disable_dma(uart->tx_dma_channel);
+        free_dma(uart->tx_dma_channel);
+        disable_dma(uart->rx_dma_channel);
+        free_dma(uart->rx_dma_channel);
+        del_timer(&(uart->rx_dma_timer));
+        dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
+#else
+#ifdef CONFIG_BF54x
+        switch (uart->port.irq) {
+        case IRQ_UART3_RX:
+                free_dma(CH_UART3_RX);
+                free_dma(CH_UART3_TX);
+                break;
+        case IRQ_UART2_RX:
+                free_dma(CH_UART2_RX);
+                free_dma(CH_UART2_TX);
+                break;
+        default:
+                break;
+        };
+#endif
+        free_irq(uart->port.irq, uart);
+        free_irq(uart->port.irq+1, uart);
+#endif
+
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+        if (uart->cts_pin >= 0)
+                free_irq(gpio_to_irq(uart->cts_pin), uart);
+#endif
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+        if (uart->cts_pin >= 0)
+                free_irq(uart->status_irq, uart);
+#endif
+}
+
+static void
+bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
+                   struct ktermios *old)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        unsigned long flags;
+        unsigned int baud, quot;
+        unsigned short val, ier, lcr = 0;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS8:
+                lcr = WLS(8);
+                break;
+        case CS7:
+                lcr = WLS(7);
+                break;
+        case CS6:
+                lcr = WLS(6);
+                break;
+        case CS5:
+                lcr = WLS(5);
+                break;
+        default:
+                printk(KERN_ERR "%s: word lengh not supported\n",
+                        __func__);
+        }
+
+        /* Anomaly notes:
+         *  05000231 -  STOP bit is always set to 1 whatever the user is set.
+         */
+        if (termios->c_cflag & CSTOPB) {
+                if (ANOMALY_05000231)
+                        printk(KERN_WARNING "STOP bits other than 1 is not "
+                                "supported in case of anomaly 05000231.\n");
+                else
+                        lcr |= STB;
+        }
+        if (termios->c_cflag & PARENB)
+                lcr |= PEN;
+        if (!(termios->c_cflag & PARODD))
+                lcr |= EPS;
+        if (termios->c_cflag & CMSPAR)
+                lcr |= STP;
+
+        spin_lock_irqsave(&uart->port.lock, flags);
+
+        port->read_status_mask = OE;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= (FE | PE);
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= BI;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= FE | PE;
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= BI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= OE;
+        }
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+        quot = uart_get_divisor(port, baud);
+
+        /* If discipline is not IRDA, apply ANOMALY_05000230 */
+        if (termios->c_line != N_IRDA)
+                quot -= ANOMALY_05000230;
+
+        UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
+
+        /* Disable UART */
+        ier = UART_GET_IER(uart);
+        UART_DISABLE_INTS(uart);
+
+        /* Set DLAB in LCR to Access DLL and DLH */
+        UART_SET_DLAB(uart);
+
+        UART_PUT_DLL(uart, quot & 0xFF);
+        UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
+        SSYNC();
+
+        /* Clear DLAB in LCR to Access THR RBR IER */
+        UART_CLEAR_DLAB(uart);
+
+        UART_PUT_LCR(uart, lcr);
+
+        /* Enable UART */
+        UART_ENABLE_INTS(uart, ier);
+
+        val = UART_GET_GCTL(uart);
+        val |= UCEN;
+        UART_PUT_GCTL(uart, val);
+
+        /* Port speed changed, update the per-port timeout. */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        spin_unlock_irqrestore(&uart->port.lock, flags);
+}
+
+static const char *bfin_serial_type(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+        return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void bfin_serial_release_port(struct uart_port *port)
+{
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int bfin_serial_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void bfin_serial_config_port(struct uart_port *port, int flags)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+        if (flags & UART_CONFIG_TYPE &&
+            bfin_serial_request_port(&uart->port) == 0)
+                uart->port.type = PORT_BFIN;
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ * The only change we allow are to the flags and type, and
+ * even then only between PORT_BFIN and PORT_UNKNOWN
+ */
+static int
+bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return 0;
+}
+
+/*
+ * Enable the IrDA function if tty->ldisc.num is N_IRDA.
+ * In other cases, disable IrDA function.
+ */
+static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        unsigned short val;
+
+        switch (ld) {
+        case N_IRDA:
+                val = UART_GET_GCTL(uart);
+                val |= (IREN | RPOLC);
+                UART_PUT_GCTL(uart, val);
+                break;
+        default:
+                val = UART_GET_GCTL(uart);
+                val &= ~(IREN | RPOLC);
+                UART_PUT_GCTL(uart, val);
+        }
+}
+
+static void bfin_serial_reset_irda(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        unsigned short val;
+
+        val = UART_GET_GCTL(uart);
+        val &= ~(IREN | RPOLC);
+        UART_PUT_GCTL(uart, val);
+        SSYNC();
+        val |= (IREN | RPOLC);
+        UART_PUT_GCTL(uart, val);
+        SSYNC();
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+/* Anomaly notes:
+ *  05000099 -  Because we only use THRE in poll_put and DR in poll_get,
+ *              losing other bits of UART_LSR is not a problem here.
+ */
+static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+
+        while (!(UART_GET_LSR(uart) & THRE))
+                cpu_relax();
+
+        UART_CLEAR_DLAB(uart);
+        UART_PUT_CHAR(uart, (unsigned char)chr);
+}
+
+static int bfin_serial_poll_get_char(struct uart_port *port)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        unsigned char chr;
+
+        while (!(UART_GET_LSR(uart) & DR))
+                cpu_relax();
+
+        UART_CLEAR_DLAB(uart);
+        chr = UART_GET_CHAR(uart);
+
+        return chr;
+}
+#endif
+
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+        defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+static void bfin_kgdboc_port_shutdown(struct uart_port *port)
+{
+        if (kgdboc_break_enabled) {
+                kgdboc_break_enabled = 0;
+                bfin_serial_shutdown(port);
+        }
+}
+
+static int bfin_kgdboc_port_startup(struct uart_port *port)
+{
+        kgdboc_port_line = port->line;
+        kgdboc_break_enabled = !bfin_serial_startup(port);
+        return 0;
+}
+#endif
+
+static struct uart_ops bfin_serial_pops = {
+        .tx_empty       = bfin_serial_tx_empty,
+        .set_mctrl      = bfin_serial_set_mctrl,
+        .get_mctrl      = bfin_serial_get_mctrl,
+        .stop_tx        = bfin_serial_stop_tx,
+        .start_tx       = bfin_serial_start_tx,
+        .stop_rx        = bfin_serial_stop_rx,
+        .enable_ms      = bfin_serial_enable_ms,
+        .break_ctl      = bfin_serial_break_ctl,
+        .startup        = bfin_serial_startup,
+        .shutdown       = bfin_serial_shutdown,
+        .set_termios    = bfin_serial_set_termios,
+        .set_ldisc      = bfin_serial_set_ldisc,
+        .type           = bfin_serial_type,
+        .release_port   = bfin_serial_release_port,
+        .request_port   = bfin_serial_request_port,
+        .config_port    = bfin_serial_config_port,
+        .verify_port    = bfin_serial_verify_port,
+#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
+        defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
+        .kgdboc_port_startup    = bfin_kgdboc_port_startup,
+        .kgdboc_port_shutdown   = bfin_kgdboc_port_shutdown,
+#endif
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_put_char  = bfin_serial_poll_put_char,
+        .poll_get_char  = bfin_serial_poll_get_char,
+#endif
+};
+
+#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
+/*
+ * If the port was already initialised (eg, by a boot loader),
+ * try to determine the current setup.
+ */
+static void __init
+bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
+                           int *parity, int *bits)
+{
+        unsigned short status;
+
+        status = UART_GET_IER(uart) & (ERBFI | ETBEI);
+        if (status == (ERBFI | ETBEI)) {
+                /* ok, the port was enabled */
+                u16 lcr, dlh, dll;
+
+                lcr = UART_GET_LCR(uart);
+
+                *parity = 'n';
+                if (lcr & PEN) {
+                        if (lcr & EPS)
+                                *parity = 'e';
+                        else
+                                *parity = 'o';
+                }
+                switch (lcr & 0x03) {
+                        case 0: *bits = 5; break;
+                        case 1: *bits = 6; break;
+                        case 2: *bits = 7; break;
+                        case 3: *bits = 8; break;
+                }
+                /* Set DLAB in LCR to Access DLL and DLH */
+                UART_SET_DLAB(uart);
+
+                dll = UART_GET_DLL(uart);
+                dlh = UART_GET_DLH(uart);
+
+                /* Clear DLAB in LCR to Access THR RBR IER */
+                UART_CLEAR_DLAB(uart);
+
+                *baud = get_sclk() / (16*(dll | dlh << 8));
+        }
+        pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
+}
+
+static struct uart_driver bfin_serial_reg;
+
+static void bfin_serial_console_putchar(struct uart_port *port, int ch)
+{
+        struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
+        while (!(UART_GET_LSR(uart) & THRE))
+                barrier();
+        UART_PUT_CHAR(uart, ch);
+}
+
+#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
+                 defined (CONFIG_EARLY_PRINTK) */
+
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+#define CLASS_BFIN_CONSOLE      "bfin-console"
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct bfin_serial_port *uart = bfin_serial_ports[co->index];
+        unsigned long flags;
+
+        spin_lock_irqsave(&uart->port.lock, flags);
+        uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
+        spin_unlock_irqrestore(&uart->port.lock, flags);
+
+}
+
+static int __init
+bfin_serial_console_setup(struct console *co, char *options)
+{
+        struct bfin_serial_port *uart;
+        int baud = 57600;
+        int bits = 8;
+        int parity = 'n';
+# if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+        defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
+        int flow = 'r';
+# else
+        int flow = 'n';
+# endif
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
+                return -ENODEV;
+
+        uart = bfin_serial_ports[co->index];
+        if (!uart)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                bfin_serial_console_get_options(uart, &baud, &parity, &bits);
+
+        return uart_set_options(&uart->port, co, baud, parity, bits, flow);
+}
+
+static struct console bfin_serial_console = {
+        .name           = BFIN_SERIAL_DEV_NAME,
+        .write          = bfin_serial_console_write,
+        .device         = uart_console_device,
+        .setup          = bfin_serial_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &bfin_serial_reg,
+};
+#define BFIN_SERIAL_CONSOLE     &bfin_serial_console
+#else
+#define BFIN_SERIAL_CONSOLE     NULL
+#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
+
+#ifdef  CONFIG_EARLY_PRINTK
+static struct bfin_serial_port bfin_earlyprintk_port;
+#define CLASS_BFIN_EARLYPRINTK  "bfin-earlyprintk"
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
+{
+        unsigned long flags;
+
+        if (bfin_earlyprintk_port.port.line != co->index)
+                return;
+
+        spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
+        uart_console_write(&bfin_earlyprintk_port.port, s, count,
+                bfin_serial_console_putchar);
+        spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
+}
+
+/*
+ * This should have a .setup or .early_setup in it, but then things get called
+ * without the command line options, and the baud rate gets messed up - so
+ * don't let the common infrastructure play with things. (see calls to setup
+ * & earlysetup in ./kernel/printk.c:register_console()
+ */
+static struct __initdata console bfin_early_serial_console = {
+        .name = "early_BFuart",
+        .write = bfin_earlyprintk_console_write,
+        .device = uart_console_device,
+        .flags = CON_PRINTBUFFER,
+        .index = -1,
+        .data  = &bfin_serial_reg,
+};
+#endif
+
+static struct uart_driver bfin_serial_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = DRIVER_NAME,
+        .dev_name               = BFIN_SERIAL_DEV_NAME,
+        .major                  = BFIN_SERIAL_MAJOR,
+        .minor                  = BFIN_SERIAL_MINOR,
+        .nr                     = BFIN_UART_NR_PORTS,
+        .cons                   = BFIN_SERIAL_CONSOLE,
+};
+
+static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct bfin_serial_port *uart = platform_get_drvdata(pdev);
+
+        return uart_suspend_port(&bfin_serial_reg, &uart->port);
+}
+
+static int bfin_serial_resume(struct platform_device *pdev)
+{
+        struct bfin_serial_port *uart = platform_get_drvdata(pdev);
+
+        return uart_resume_port(&bfin_serial_reg, &uart->port);
+}
+
+static int bfin_serial_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        struct bfin_serial_port *uart = NULL;
+        int ret = 0;
+
+        if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
+                dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
+                return -ENOENT;
+        }
+
+        if (bfin_serial_ports[pdev->id] == NULL) {
+
+                uart = kzalloc(sizeof(*uart), GFP_KERNEL);
+                if (!uart) {
+                        dev_err(&pdev->dev,
+                                "fail to malloc bfin_serial_port\n");
+                        return -ENOMEM;
+                }
+                bfin_serial_ports[pdev->id] = uart;
+
+#ifdef CONFIG_EARLY_PRINTK
+                if (!(bfin_earlyprintk_port.port.membase
+                        && bfin_earlyprintk_port.port.line == pdev->id)) {
+                        /*
+                         * If the peripheral PINs of current port is allocated
+                         * in earlyprintk probe stage, don't do it again.
+                         */
+#endif
+                ret = peripheral_request_list(
+                        (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
+                if (ret) {
+                        dev_err(&pdev->dev,
+                                "fail to request bfin serial peripherals\n");
+                        goto out_error_free_mem;
+                }
+#ifdef CONFIG_EARLY_PRINTK
+                }
+#endif
+
+                spin_lock_init(&uart->port.lock);
+                uart->port.uartclk   = get_sclk();
+                uart->port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
+                uart->port.ops       = &bfin_serial_pops;
+                uart->port.line      = pdev->id;
+                uart->port.iotype    = UPIO_MEM;
+                uart->port.flags     = UPF_BOOT_AUTOCONF;
+
+                res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+                if (res == NULL) {
+                        dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+                        ret = -ENOENT;
+                        goto out_error_free_peripherals;
+                }
+
+                uart->port.membase = ioremap(res->start,
+                        res->end - res->start);
+                if (!uart->port.membase) {
+                        dev_err(&pdev->dev, "Cannot map uart IO\n");
+                        ret = -ENXIO;
+                        goto out_error_free_peripherals;
+                }
+                uart->port.mapbase = res->start;
+
+                uart->port.irq = platform_get_irq(pdev, 0);
+                if (uart->port.irq < 0) {
+                        dev_err(&pdev->dev, "No uart RX/TX IRQ specified\n");
+                        ret = -ENOENT;
+                        goto out_error_unmap;
+                }
+
+                uart->status_irq = platform_get_irq(pdev, 1);
+                if (uart->status_irq < 0) {
+                        dev_err(&pdev->dev, "No uart status IRQ specified\n");
+                        ret = -ENOENT;
+                        goto out_error_unmap;
+                }
+
+#ifdef CONFIG_SERIAL_BFIN_DMA
+                spin_lock_init(&uart->rx_lock);
+                uart->tx_done       = 1;
+                uart->tx_count      = 0;
+
+                res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+                if (res == NULL) {
+                        dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
+                        ret = -ENOENT;
+                        goto out_error_unmap;
+                }
+                uart->tx_dma_channel = res->start;
+
+                res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+                if (res == NULL) {
+                        dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
+                        ret = -ENOENT;
+                        goto out_error_unmap;
+                }
+                uart->rx_dma_channel = res->start;
+
+                init_timer(&(uart->rx_dma_timer));
+#endif
+
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+        defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
+                res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+                if (res == NULL)
+                        uart->cts_pin = -1;
+                else
+                        uart->cts_pin = res->start;
+
+                res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+                if (res == NULL)
+                        uart->rts_pin = -1;
+                else
+                        uart->rts_pin = res->start;
+# if defined(CONFIG_SERIAL_BFIN_CTSRTS)
+                if (uart->rts_pin >= 0)
+                        gpio_request(uart->rts_pin, DRIVER_NAME);
+# endif
+#endif
+        }
+
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+        if (!is_early_platform_device(pdev)) {
+#endif
+                uart = bfin_serial_ports[pdev->id];
+                uart->port.dev = &pdev->dev;
+                dev_set_drvdata(&pdev->dev, uart);
+                ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+        }
+#endif
+
+        if (!ret)
+                return 0;
+
+        if (uart) {
+out_error_unmap:
+                iounmap(uart->port.membase);
+out_error_free_peripherals:
+                peripheral_free_list(
+                        (unsigned short *)pdev->dev.platform_data);
+out_error_free_mem:
+                kfree(uart);
+                bfin_serial_ports[pdev->id] = NULL;
+        }
+
+        return ret;
+}
+
+static int __devexit bfin_serial_remove(struct platform_device *pdev)
+{
+        struct bfin_serial_port *uart = platform_get_drvdata(pdev);
+
+        dev_set_drvdata(&pdev->dev, NULL);
+
+        if (uart) {
+                uart_remove_one_port(&bfin_serial_reg, &uart->port);
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+                if (uart->rts_pin >= 0)
+                        gpio_free(uart->rts_pin);
+#endif
+                iounmap(uart->port.membase);
+                peripheral_free_list(
+                        (unsigned short *)pdev->dev.platform_data);
+                kfree(uart);
+                bfin_serial_ports[pdev->id] = NULL;
+        }
+
+        return 0;
+}
+
+static struct platform_driver bfin_serial_driver = {
+        .probe          = bfin_serial_probe,
+        .remove         = __devexit_p(bfin_serial_remove),
+        .suspend        = bfin_serial_suspend,
+        .resume         = bfin_serial_resume,
+        .driver         = {
+                .name   = DRIVER_NAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+#if defined(CONFIG_SERIAL_BFIN_CONSOLE)
+static __initdata struct early_platform_driver early_bfin_serial_driver = {
+        .class_str = CLASS_BFIN_CONSOLE,
+        .pdrv = &bfin_serial_driver,
+        .requested_id = EARLY_PLATFORM_ID_UNSET,
+};
+
+static int __init bfin_serial_rs_console_init(void)
+{
+        early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
+
+        early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
+
+        register_console(&bfin_serial_console);
+
+        return 0;
+}
+console_initcall(bfin_serial_rs_console_init);
+#endif
+
+#ifdef CONFIG_EARLY_PRINTK
+/*
+ * Memory can't be allocated dynamically during earlyprink init stage.
+ * So, do individual probe for earlyprink with a static uart port variable.
+ */
+static int bfin_earlyprintk_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        int ret;
+
+        if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
+                dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
+                return -ENOENT;
+        }
+
+        ret = peripheral_request_list(
+                (unsigned short *)pdev->dev.platform_data, DRIVER_NAME);
+        if (ret) {
+                dev_err(&pdev->dev,
+                                "fail to request bfin serial peripherals\n");
+                        return ret;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
+                dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+                ret = -ENOENT;
+                goto out_error_free_peripherals;
+        }
+
+        bfin_earlyprintk_port.port.membase = ioremap(res->start,
+                        res->end - res->start);
+        if (!bfin_earlyprintk_port.port.membase) {
+                dev_err(&pdev->dev, "Cannot map uart IO\n");
+                ret = -ENXIO;
+                goto out_error_free_peripherals;
+        }
+        bfin_earlyprintk_port.port.mapbase = res->start;
+        bfin_earlyprintk_port.port.line = pdev->id;
+        bfin_earlyprintk_port.port.uartclk = get_sclk();
+        bfin_earlyprintk_port.port.fifosize  = BFIN_UART_TX_FIFO_SIZE;
+        spin_lock_init(&bfin_earlyprintk_port.port.lock);
+
+        return 0;
+
+out_error_free_peripherals:
+        peripheral_free_list(
+                (unsigned short *)pdev->dev.platform_data);
+
+        return ret;
+}
+
+static struct platform_driver bfin_earlyprintk_driver = {
+        .probe          = bfin_earlyprintk_probe,
+        .driver         = {
+                .name   = DRIVER_NAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+static __initdata struct early_platform_driver early_bfin_earlyprintk_driver = {
+        .class_str = CLASS_BFIN_EARLYPRINTK,
+        .pdrv = &bfin_earlyprintk_driver,
+        .requested_id = EARLY_PLATFORM_ID_UNSET,
+};
+
+struct console __init *bfin_earlyserial_init(unsigned int port,
+                                                unsigned int cflag)
+{
+        struct ktermios t;
+        char port_name[20];
+
+        if (port < 0 || port >= BFIN_UART_NR_PORTS)
+                return NULL;
+
+        /*
+         * Only probe resource of the given port in earlyprintk boot arg.
+         * The expected port id should be indicated in port name string.
+         */
+        snprintf(port_name, 20, DRIVER_NAME ".%d", port);
+        early_platform_driver_register(&early_bfin_earlyprintk_driver,
+                port_name);
+        early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
+
+        if (!bfin_earlyprintk_port.port.membase)
+                return NULL;
+
+#ifdef CONFIG_SERIAL_BFIN_CONSOLE
+        /*
+         * If we are using early serial, don't let the normal console rewind
+         * log buffer, since that causes things to be printed multiple times
+         */
+        bfin_serial_console.flags &= ~CON_PRINTBUFFER;
+#endif
+
+        bfin_early_serial_console.index = port;
+        t.c_cflag = cflag;
+        t.c_iflag = 0;
+        t.c_oflag = 0;
+        t.c_lflag = ICANON;
+        t.c_line = port;
+        bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
+
+        return &bfin_early_serial_console;
+}
+#endif /* CONFIG_EARLY_PRINTK */
+
+static int __init bfin_serial_init(void)
+{
+        int ret;
+
+        pr_info("Blackfin serial driver\n");
+
+        ret = uart_register_driver(&bfin_serial_reg);
+        if (ret) {
+                pr_err("failed to register %s:%d\n",
+                        bfin_serial_reg.driver_name, ret);
+        }
+
+        ret = platform_driver_register(&bfin_serial_driver);
+        if (ret) {
+                pr_err("fail to register bfin uart\n");
+                uart_unregister_driver(&bfin_serial_reg);
+        }
+
+        return ret;
+}
+
+static void __exit bfin_serial_exit(void)
+{
+        platform_driver_unregister(&bfin_serial_driver);
+        uart_unregister_driver(&bfin_serial_reg);
+}
+
+
+module_init(bfin_serial_init);
+module_exit(bfin_serial_exit);
+
+MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
+MODULE_DESCRIPTION("Blackfin generic serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
+MODULE_ALIAS("platform:bfin-uart");
diff --git a/drivers/tty/serial/bfin_sport_uart.c b/drivers/tty/serial/bfin_sport_uart.c
new file mode 100644
index 000000000000..891d194ae754
--- /dev/null
+++ b/drivers/tty/serial/bfin_sport_uart.c
@@ -0,0 +1,934 @@
+/*
+ * Blackfin On-Chip Sport Emulated UART Driver
+ *
+ * Copyright 2006-2009 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+/*
+ * This driver and the hardware supported are in term of EE-191 of ADI.
+ * http://www.analog.com/static/imported-files/application_notes/EE191.pdf 
+ * This application note describe how to implement a UART on a Sharc DSP,
+ * but this driver is implemented on Blackfin Processor.
+ * Transmit Frame Sync is not used by this driver to transfer data out.
+ */
+
+/* #define DEBUG */
+
+#define DRV_NAME "bfin-sport-uart"
+#define DEVICE_NAME     "ttySS"
+#define pr_fmt(fmt) DRV_NAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+
+#include <asm/bfin_sport.h>
+#include <asm/delay.h>
+#include <asm/portmux.h>
+
+#include "bfin_sport_uart.h"
+
+struct sport_uart_port {
+        struct uart_port        port;
+        int                     err_irq;
+        unsigned short          csize;
+        unsigned short          rxmask;
+        unsigned short          txmask1;
+        unsigned short          txmask2;
+        unsigned char           stopb;
+/*      unsigned char           parib; */
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        int cts_pin;
+        int rts_pin;
+#endif
+};
+
+static int sport_uart_tx_chars(struct sport_uart_port *up);
+static void sport_stop_tx(struct uart_port *port);
+
+static inline void tx_one_byte(struct sport_uart_port *up, unsigned int value)
+{
+        pr_debug("%s value:%x, mask1=0x%x, mask2=0x%x\n", __func__, value,
+                up->txmask1, up->txmask2);
+
+        /* Place Start and Stop bits */
+        __asm__ __volatile__ (
+                "%[val] <<= 1;"
+                "%[val] = %[val] & %[mask1];"
+                "%[val] = %[val] | %[mask2];"
+                : [val]"+d"(value)
+                : [mask1]"d"(up->txmask1), [mask2]"d"(up->txmask2)
+                : "ASTAT"
+        );
+        pr_debug("%s value:%x\n", __func__, value);
+
+        SPORT_PUT_TX(up, value);
+}
+
+static inline unsigned char rx_one_byte(struct sport_uart_port *up)
+{
+        unsigned int value;
+        unsigned char extract;
+        u32 tmp_mask1, tmp_mask2, tmp_shift, tmp;
+
+        if ((up->csize + up->stopb) > 7)
+                value = SPORT_GET_RX32(up);
+        else
+                value = SPORT_GET_RX(up);
+
+        pr_debug("%s value:%x, cs=%d, mask=0x%x\n", __func__, value,
+                up->csize, up->rxmask);
+
+        /* Extract data */
+        __asm__ __volatile__ (
+                "%[extr] = 0;"
+                "%[mask1] = %[rxmask];"
+                "%[mask2] = 0x0200(Z);"
+                "%[shift] = 0;"
+                "LSETUP(.Lloop_s, .Lloop_e) LC0 = %[lc];"
+                ".Lloop_s:"
+                "%[tmp] = extract(%[val], %[mask1].L)(Z);"
+                "%[tmp] <<= %[shift];"
+                "%[extr] = %[extr] | %[tmp];"
+                "%[mask1] = %[mask1] - %[mask2];"
+                ".Lloop_e:"
+                "%[shift] += 1;"
+                : [extr]"=&d"(extract), [shift]"=&d"(tmp_shift), [tmp]"=&d"(tmp),
+                  [mask1]"=&d"(tmp_mask1), [mask2]"=&d"(tmp_mask2)
+                : [val]"d"(value), [rxmask]"d"(up->rxmask), [lc]"a"(up->csize)
+                : "ASTAT", "LB0", "LC0", "LT0"
+        );
+
+        pr_debug("      extract:%x\n", extract);
+        return extract;
+}
+
+static int sport_uart_setup(struct sport_uart_port *up, int size, int baud_rate)
+{
+        int tclkdiv, rclkdiv;
+        unsigned int sclk = get_sclk();
+
+        /* Set TCR1 and TCR2, TFSR is not enabled for uart */
+        SPORT_PUT_TCR1(up, (LATFS | ITFS | TFSR | TLSBIT | ITCLK));
+        SPORT_PUT_TCR2(up, size + 1);
+        pr_debug("%s TCR1:%x, TCR2:%x\n", __func__, SPORT_GET_TCR1(up), SPORT_GET_TCR2(up));
+
+        /* Set RCR1 and RCR2 */
+        SPORT_PUT_RCR1(up, (RCKFE | LARFS | LRFS | RFSR | IRCLK));
+        SPORT_PUT_RCR2(up, (size + 1) * 2 - 1);
+        pr_debug("%s RCR1:%x, RCR2:%x\n", __func__, SPORT_GET_RCR1(up), SPORT_GET_RCR2(up));
+
+        tclkdiv = sclk / (2 * baud_rate) - 1;
+        /* The actual uart baud rate of devices vary between +/-2%. The sport
+         * RX sample rate should be faster than the double of the worst case,
+         * otherwise, wrong data are received. So, set sport RX clock to be
+         * 3% faster.
+         */
+        rclkdiv = sclk / (2 * baud_rate * 2 * 97 / 100) - 1;
+        SPORT_PUT_TCLKDIV(up, tclkdiv);
+        SPORT_PUT_RCLKDIV(up, rclkdiv);
+        SSYNC();
+        pr_debug("%s sclk:%d, baud_rate:%d, tclkdiv:%d, rclkdiv:%d\n",
+                        __func__, sclk, baud_rate, tclkdiv, rclkdiv);
+
+        return 0;
+}
+
+static irqreturn_t sport_uart_rx_irq(int irq, void *dev_id)
+{
+        struct sport_uart_port *up = dev_id;
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned int ch;
+
+        spin_lock(&up->port.lock);
+
+        while (SPORT_GET_STAT(up) & RXNE) {
+                ch = rx_one_byte(up);
+                up->port.icount.rx++;
+
+                if (!uart_handle_sysrq_char(&up->port, ch))
+                        tty_insert_flip_char(tty, ch, TTY_NORMAL);
+        }
+        tty_flip_buffer_push(tty);
+
+        spin_unlock(&up->port.lock);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t sport_uart_tx_irq(int irq, void *dev_id)
+{
+        struct sport_uart_port *up = dev_id;
+
+        spin_lock(&up->port.lock);
+        sport_uart_tx_chars(up);
+        spin_unlock(&up->port.lock);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t sport_uart_err_irq(int irq, void *dev_id)
+{
+        struct sport_uart_port *up = dev_id;
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned int stat = SPORT_GET_STAT(up);
+
+        spin_lock(&up->port.lock);
+
+        /* Overflow in RX FIFO */
+        if (stat & ROVF) {
+                up->port.icount.overrun++;
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                SPORT_PUT_STAT(up, ROVF); /* Clear ROVF bit */
+        }
+        /* These should not happen */
+        if (stat & (TOVF | TUVF | RUVF)) {
+                pr_err("SPORT Error:%s %s %s\n",
+                       (stat & TOVF) ? "TX overflow" : "",
+                       (stat & TUVF) ? "TX underflow" : "",
+                       (stat & RUVF) ? "RX underflow" : "");
+                SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
+                SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
+        }
+        SSYNC();
+
+        spin_unlock(&up->port.lock);
+        return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+static unsigned int sport_get_mctrl(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+        if (up->cts_pin < 0)
+                return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+        /* CTS PIN is negative assertive. */
+        if (SPORT_UART_GET_CTS(up))
+                return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+        else
+                return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+        if (up->rts_pin < 0)
+                return;
+
+        /* RTS PIN is negative assertive. */
+        if (mctrl & TIOCM_RTS)
+                SPORT_UART_ENABLE_RTS(up);
+        else
+                SPORT_UART_DISABLE_RTS(up);
+}
+
+/*
+ * Handle any change of modem status signal.
+ */
+static irqreturn_t sport_mctrl_cts_int(int irq, void *dev_id)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)dev_id;
+        unsigned int status;
+
+        status = sport_get_mctrl(&up->port);
+        uart_handle_cts_change(&up->port, status & TIOCM_CTS);
+
+        return IRQ_HANDLED;
+}
+#else
+static unsigned int sport_get_mctrl(struct uart_port *port)
+{
+        pr_debug("%s enter\n", __func__);
+        return TIOCM_CTS | TIOCM_CD | TIOCM_DSR;
+}
+
+static void sport_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        pr_debug("%s enter\n", __func__);
+}
+#endif
+
+/* Reqeust IRQ, Setup clock */
+static int sport_startup(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+        int ret;
+
+        pr_debug("%s enter\n", __func__);
+        ret = request_irq(up->port.irq, sport_uart_rx_irq, 0,
+                "SPORT_UART_RX", up);
+        if (ret) {
+                dev_err(port->dev, "unable to request SPORT RX interrupt\n");
+                return ret;
+        }
+
+        ret = request_irq(up->port.irq+1, sport_uart_tx_irq, 0,
+                "SPORT_UART_TX", up);
+        if (ret) {
+                dev_err(port->dev, "unable to request SPORT TX interrupt\n");
+                goto fail1;
+        }
+
+        ret = request_irq(up->err_irq, sport_uart_err_irq, 0,
+                "SPORT_UART_STATUS", up);
+        if (ret) {
+                dev_err(port->dev, "unable to request SPORT status interrupt\n");
+                goto fail2;
+        }
+
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        if (up->cts_pin >= 0) {
+                if (request_irq(gpio_to_irq(up->cts_pin),
+                        sport_mctrl_cts_int,
+                        IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                        IRQF_DISABLED, "BFIN_SPORT_UART_CTS", up)) {
+                        up->cts_pin = -1;
+                        dev_info(port->dev, "Unable to attach BlackFin UART over SPORT CTS interrupt. So, disable it.\n");
+                }
+        }
+        if (up->rts_pin >= 0)
+                gpio_direction_output(up->rts_pin, 0);
+#endif
+
+        return 0;
+ fail2:
+        free_irq(up->port.irq+1, up);
+ fail1:
+        free_irq(up->port.irq, up);
+
+        return ret;
+}
+
+/*
+ * sport_uart_tx_chars
+ *
+ * ret 1 means need to enable sport.
+ * ret 0 means do nothing.
+ */
+static int sport_uart_tx_chars(struct sport_uart_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+
+        if (SPORT_GET_STAT(up) & TXF)
+                return 0;
+
+        if (up->port.x_char) {
+                tx_one_byte(up, up->port.x_char);
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return 1;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+                /* The waiting loop to stop SPORT TX from TX interrupt is
+                 * too long. This may block SPORT RX interrupts and cause
+                 * RX FIFO overflow. So, do stop sport TX only after the last
+                 * char in TX FIFO is moved into the shift register.
+                 */
+                if (SPORT_GET_STAT(up) & TXHRE)
+                        sport_stop_tx(&up->port);
+                return 0;
+        }
+
+        while(!(SPORT_GET_STAT(up) & TXF) && !uart_circ_empty(xmit)) {
+                tx_one_byte(up, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
+                up->port.icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        return 1;
+}
+
+static unsigned int sport_tx_empty(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+        unsigned int stat;
+
+        stat = SPORT_GET_STAT(up);
+        pr_debug("%s stat:%04x\n", __func__, stat);
+        if (stat & TXHRE) {
+                return TIOCSER_TEMT;
+        } else
+                return 0;
+}
+
+static void sport_stop_tx(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+
+        pr_debug("%s enter\n", __func__);
+
+        if (!(SPORT_GET_TCR1(up) & TSPEN))
+                return;
+
+        /* Although the hold register is empty, last byte is still in shift
+         * register and not sent out yet. So, put a dummy data into TX FIFO.
+         * Then, sport tx stops when last byte is shift out and the dummy
+         * data is moved into the shift register.
+         */
+        SPORT_PUT_TX(up, 0xffff);
+        while (!(SPORT_GET_STAT(up) & TXHRE))
+                cpu_relax();
+
+        SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
+        SSYNC();
+
+        return;
+}
+
+static void sport_start_tx(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+
+        pr_debug("%s enter\n", __func__);
+
+        /* Write data into SPORT FIFO before enable SPROT to transmit */
+        if (sport_uart_tx_chars(up)) {
+                /* Enable transmit, then an interrupt will generated */
+                SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
+                SSYNC();
+        }
+
+        pr_debug("%s exit\n", __func__);
+}
+
+static void sport_stop_rx(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+
+        pr_debug("%s enter\n", __func__);
+        /* Disable sport to stop rx */
+        SPORT_PUT_RCR1(up, (SPORT_GET_RCR1(up) & ~RSPEN));
+        SSYNC();
+}
+
+static void sport_enable_ms(struct uart_port *port)
+{
+        pr_debug("%s enter\n", __func__);
+}
+
+static void sport_break_ctl(struct uart_port *port, int break_state)
+{
+        pr_debug("%s enter\n", __func__);
+}
+
+static void sport_shutdown(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+
+        dev_dbg(port->dev, "%s enter\n", __func__);
+
+        /* Disable sport */
+        SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
+        SPORT_PUT_RCR1(up, (SPORT_GET_RCR1(up) & ~RSPEN));
+        SSYNC();
+
+        free_irq(up->port.irq, up);
+        free_irq(up->port.irq+1, up);
+        free_irq(up->err_irq, up);
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        if (up->cts_pin >= 0)
+                free_irq(gpio_to_irq(up->cts_pin), up);
+#endif
+}
+
+static const char *sport_type(struct uart_port *port)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+
+        pr_debug("%s enter\n", __func__);
+        return up->port.type == PORT_BFIN_SPORT ? "BFIN-SPORT-UART" : NULL;
+}
+
+static void sport_release_port(struct uart_port *port)
+{
+        pr_debug("%s enter\n", __func__);
+}
+
+static int sport_request_port(struct uart_port *port)
+{
+        pr_debug("%s enter\n", __func__);
+        return 0;
+}
+
+static void sport_config_port(struct uart_port *port, int flags)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+
+        pr_debug("%s enter\n", __func__);
+        up->port.type = PORT_BFIN_SPORT;
+}
+
+static int sport_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        pr_debug("%s enter\n", __func__);
+        return 0;
+}
+
+static void sport_set_termios(struct uart_port *port,
+                struct ktermios *termios, struct ktermios *old)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+        unsigned long flags;
+        int i;
+
+        pr_debug("%s enter, c_cflag:%08x\n", __func__, termios->c_cflag);
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS8:
+                up->csize = 8;
+                break;
+        case CS7:
+                up->csize = 7;
+                break;
+        case CS6:
+                up->csize = 6;
+                break;
+        case CS5:
+                up->csize = 5;
+                break;
+        default:
+                pr_warning("requested word length not supported\n");
+        }
+
+        if (termios->c_cflag & CSTOPB) {
+                up->stopb = 1;
+        }
+        if (termios->c_cflag & PARENB) {
+                pr_warning("PAREN bits is not supported yet\n");
+                /* up->parib = 1; */
+        }
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        port->read_status_mask = 0;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+
+        /* RX extract mask */
+        up->rxmask = 0x01 | (((up->csize + up->stopb) * 2 - 1) << 0x8);
+        /* TX masks, 8 bit data and 1 bit stop for example:
+         * mask1 = b#0111111110
+         * mask2 = b#1000000000
+         */
+        for (i = 0, up->txmask1 = 0; i < up->csize; i++)
+                up->txmask1 |= (1<<i);
+        up->txmask2 = (1<<i);
+        if (up->stopb) {
+                ++i;
+                up->txmask2 |= (1<<i);
+        }
+        up->txmask1 <<= 1;
+        up->txmask2 <<= 1;
+        /* uart baud rate */
+        port->uartclk = uart_get_baud_rate(port, termios, old, 0, get_sclk()/16);
+
+        /* Disable UART */
+        SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
+        SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
+
+        sport_uart_setup(up, up->csize + up->stopb, port->uartclk);
+
+        /* driver TX line high after config, one dummy data is
+         * necessary to stop sport after shift one byte
+         */
+        SPORT_PUT_TX(up, 0xffff);
+        SPORT_PUT_TX(up, 0xffff);
+        SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
+        SSYNC();
+        while (!(SPORT_GET_STAT(up) & TXHRE))
+                cpu_relax();
+        SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
+        SSYNC();
+
+        /* Port speed changed, update the per-port timeout. */
+        uart_update_timeout(port, termios->c_cflag, port->uartclk);
+
+        /* Enable sport rx */
+        SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) | RSPEN);
+        SSYNC();
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+struct uart_ops sport_uart_ops = {
+        .tx_empty       = sport_tx_empty,
+        .set_mctrl      = sport_set_mctrl,
+        .get_mctrl      = sport_get_mctrl,
+        .stop_tx        = sport_stop_tx,
+        .start_tx       = sport_start_tx,
+        .stop_rx        = sport_stop_rx,
+        .enable_ms      = sport_enable_ms,
+        .break_ctl      = sport_break_ctl,
+        .startup        = sport_startup,
+        .shutdown       = sport_shutdown,
+        .set_termios    = sport_set_termios,
+        .type           = sport_type,
+        .release_port   = sport_release_port,
+        .request_port   = sport_request_port,
+        .config_port    = sport_config_port,
+        .verify_port    = sport_verify_port,
+};
+
+#define BFIN_SPORT_UART_MAX_PORTS 4
+
+static struct sport_uart_port *bfin_sport_uart_ports[BFIN_SPORT_UART_MAX_PORTS];
+
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
+#define CLASS_BFIN_SPORT_CONSOLE        "bfin-sport-console"
+
+static int __init
+sport_uart_console_setup(struct console *co, char *options)
+{
+        struct sport_uart_port *up;
+        int baud = 57600;
+        int bits = 8;
+        int parity = 'n';
+# ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+        int flow = 'r';
+# else
+        int flow = 'n';
+# endif
+
+        /* Check whether an invalid uart number has been specified */
+        if (co->index < 0 || co->index >= BFIN_SPORT_UART_MAX_PORTS)
+                return -ENODEV;
+
+        up = bfin_sport_uart_ports[co->index];
+        if (!up)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&up->port, co, baud, parity, bits, flow);
+}
+
+static void sport_uart_console_putchar(struct uart_port *port, int ch)
+{
+        struct sport_uart_port *up = (struct sport_uart_port *)port;
+
+        while (SPORT_GET_STAT(up) & TXF)
+                barrier();
+
+        tx_one_byte(up, ch);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+sport_uart_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct sport_uart_port *up = bfin_sport_uart_ports[co->index];
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        if (SPORT_GET_TCR1(up) & TSPEN)
+                uart_console_write(&up->port, s, count, sport_uart_console_putchar);
+        else {
+                /* dummy data to start sport */
+                while (SPORT_GET_STAT(up) & TXF)
+                        barrier();
+                SPORT_PUT_TX(up, 0xffff);
+                /* Enable transmit, then an interrupt will generated */
+                SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) | TSPEN));
+                SSYNC();
+
+                uart_console_write(&up->port, s, count, sport_uart_console_putchar);
+
+                /* Although the hold register is empty, last byte is still in shift
+                 * register and not sent out yet. So, put a dummy data into TX FIFO.
+                 * Then, sport tx stops when last byte is shift out and the dummy
+                 * data is moved into the shift register.
+                 */
+                while (SPORT_GET_STAT(up) & TXF)
+                        barrier();
+                SPORT_PUT_TX(up, 0xffff);
+                while (!(SPORT_GET_STAT(up) & TXHRE))
+                        barrier();
+
+                /* Stop sport tx transfer */
+                SPORT_PUT_TCR1(up, (SPORT_GET_TCR1(up) & ~TSPEN));
+                SSYNC();
+        }
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static struct uart_driver sport_uart_reg;
+
+static struct console sport_uart_console = {
+        .name           = DEVICE_NAME,
+        .write          = sport_uart_console_write,
+        .device         = uart_console_device,
+        .setup          = sport_uart_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &sport_uart_reg,
+};
+
+#define SPORT_UART_CONSOLE      (&sport_uart_console)
+#else
+#define SPORT_UART_CONSOLE      NULL
+#endif /* CONFIG_SERIAL_BFIN_SPORT_CONSOLE */
+
+
+static struct uart_driver sport_uart_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = DRV_NAME,
+        .dev_name       = DEVICE_NAME,
+        .major          = 204,
+        .minor          = 84,
+        .nr             = BFIN_SPORT_UART_MAX_PORTS,
+        .cons           = SPORT_UART_CONSOLE,
+};
+
+#ifdef CONFIG_PM
+static int sport_uart_suspend(struct device *dev)
+{
+        struct sport_uart_port *sport = dev_get_drvdata(dev);
+
+        dev_dbg(dev, "%s enter\n", __func__);
+        if (sport)
+                uart_suspend_port(&sport_uart_reg, &sport->port);
+
+        return 0;
+}
+
+static int sport_uart_resume(struct device *dev)
+{
+        struct sport_uart_port *sport = dev_get_drvdata(dev);
+
+        dev_dbg(dev, "%s enter\n", __func__);
+        if (sport)
+                uart_resume_port(&sport_uart_reg, &sport->port);
+
+        return 0;
+}
+
+static struct dev_pm_ops bfin_sport_uart_dev_pm_ops = {
+        .suspend        = sport_uart_suspend,
+        .resume         = sport_uart_resume,
+};
+#endif
+
+static int __devinit sport_uart_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        struct sport_uart_port *sport;
+        int ret = 0;
+
+        dev_dbg(&pdev->dev, "%s enter\n", __func__);
+
+        if (pdev->id < 0 || pdev->id >= BFIN_SPORT_UART_MAX_PORTS) {
+                dev_err(&pdev->dev, "Wrong sport uart platform device id.\n");
+                return -ENOENT;
+        }
+
+        if (bfin_sport_uart_ports[pdev->id] == NULL) {
+                bfin_sport_uart_ports[pdev->id] =
+                        kzalloc(sizeof(struct sport_uart_port), GFP_KERNEL);
+                sport = bfin_sport_uart_ports[pdev->id];
+                if (!sport) {
+                        dev_err(&pdev->dev,
+                                "Fail to malloc sport_uart_port\n");
+                        return -ENOMEM;
+                }
+
+                ret = peripheral_request_list(
+                        (unsigned short *)pdev->dev.platform_data, DRV_NAME);
+                if (ret) {
+                        dev_err(&pdev->dev,
+                                "Fail to request SPORT peripherals\n");
+                        goto out_error_free_mem;
+                }
+
+                spin_lock_init(&sport->port.lock);
+                sport->port.fifosize  = SPORT_TX_FIFO_SIZE,
+                sport->port.ops       = &sport_uart_ops;
+                sport->port.line      = pdev->id;
+                sport->port.iotype    = UPIO_MEM;
+                sport->port.flags     = UPF_BOOT_AUTOCONF;
+
+                res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+                if (res == NULL) {
+                        dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+                        ret = -ENOENT;
+                        goto out_error_free_peripherals;
+                }
+
+                sport->port.membase = ioremap(res->start, resource_size(res));
+                if (!sport->port.membase) {
+                        dev_err(&pdev->dev, "Cannot map sport IO\n");
+                        ret = -ENXIO;
+                        goto out_error_free_peripherals;
+                }
+                sport->port.mapbase = res->start;
+
+                sport->port.irq = platform_get_irq(pdev, 0);
+                if ((int)sport->port.irq < 0) {
+                        dev_err(&pdev->dev, "No sport RX/TX IRQ specified\n");
+                        ret = -ENOENT;
+                        goto out_error_unmap;
+                }
+
+                sport->err_irq = platform_get_irq(pdev, 1);
+                if (sport->err_irq < 0) {
+                        dev_err(&pdev->dev, "No sport status IRQ specified\n");
+                        ret = -ENOENT;
+                        goto out_error_unmap;
+                }
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+                res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+                if (res == NULL)
+                        sport->cts_pin = -1;
+                else
+                        sport->cts_pin = res->start;
+
+                res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+                if (res == NULL)
+                        sport->rts_pin = -1;
+                else
+                        sport->rts_pin = res->start;
+
+                if (sport->rts_pin >= 0)
+                        gpio_request(sport->rts_pin, DRV_NAME);
+#endif
+        }
+
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
+        if (!is_early_platform_device(pdev)) {
+#endif
+                sport = bfin_sport_uart_ports[pdev->id];
+                sport->port.dev = &pdev->dev;
+                dev_set_drvdata(&pdev->dev, sport);
+                ret = uart_add_one_port(&sport_uart_reg, &sport->port);
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
+        }
+#endif
+        if (!ret)
+                return 0;
+
+        if (sport) {
+out_error_unmap:
+                iounmap(sport->port.membase);
+out_error_free_peripherals:
+                peripheral_free_list(
+                        (unsigned short *)pdev->dev.platform_data);
+out_error_free_mem:
+                kfree(sport);
+                bfin_sport_uart_ports[pdev->id] = NULL;
+        }
+
+        return ret;
+}
+
+static int __devexit sport_uart_remove(struct platform_device *pdev)
+{
+        struct sport_uart_port *sport = platform_get_drvdata(pdev);
+
+        dev_dbg(&pdev->dev, "%s enter\n", __func__);
+        dev_set_drvdata(&pdev->dev, NULL);
+
+        if (sport) {
+                uart_remove_one_port(&sport_uart_reg, &sport->port);
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+                if (sport->rts_pin >= 0)
+                        gpio_free(sport->rts_pin);
+#endif
+                iounmap(sport->port.membase);
+                peripheral_free_list(
+                        (unsigned short *)pdev->dev.platform_data);
+                kfree(sport);
+                bfin_sport_uart_ports[pdev->id] = NULL;
+        }
+
+        return 0;
+}
+
+static struct platform_driver sport_uart_driver = {
+        .probe          = sport_uart_probe,
+        .remove         = __devexit_p(sport_uart_remove),
+        .driver         = {
+                .name   = DRV_NAME,
+#ifdef CONFIG_PM
+                .pm     = &bfin_sport_uart_dev_pm_ops,
+#endif
+        },
+};
+
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CONSOLE
+static __initdata struct early_platform_driver early_sport_uart_driver = {
+        .class_str = CLASS_BFIN_SPORT_CONSOLE,
+        .pdrv = &sport_uart_driver,
+        .requested_id = EARLY_PLATFORM_ID_UNSET,
+};
+
+static int __init sport_uart_rs_console_init(void)
+{
+        early_platform_driver_register(&early_sport_uart_driver, DRV_NAME);
+
+        early_platform_driver_probe(CLASS_BFIN_SPORT_CONSOLE,
+                BFIN_SPORT_UART_MAX_PORTS, 0);
+
+        register_console(&sport_uart_console);
+
+        return 0;
+}
+console_initcall(sport_uart_rs_console_init);
+#endif
+
+static int __init sport_uart_init(void)
+{
+        int ret;
+
+        pr_info("Blackfin uart over sport driver\n");
+
+        ret = uart_register_driver(&sport_uart_reg);
+        if (ret) {
+                pr_err("failed to register %s:%d\n",
+                                sport_uart_reg.driver_name, ret);
+                return ret;
+        }
+
+        ret = platform_driver_register(&sport_uart_driver);
+        if (ret) {
+                pr_err("failed to register sport uart driver:%d\n", ret);
+                uart_unregister_driver(&sport_uart_reg);
+        }
+
+        return ret;
+}
+module_init(sport_uart_init);
+
+static void __exit sport_uart_exit(void)
+{
+        platform_driver_unregister(&sport_uart_driver);
+        uart_unregister_driver(&sport_uart_reg);
+}
+module_exit(sport_uart_exit);
+
+MODULE_AUTHOR("Sonic Zhang, Roy Huang");
+MODULE_DESCRIPTION("Blackfin serial over SPORT driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/bfin_sport_uart.h b/drivers/tty/serial/bfin_sport_uart.h
new file mode 100644
index 000000000000..6d06ce1d5675
--- /dev/null
+++ b/drivers/tty/serial/bfin_sport_uart.h
@@ -0,0 +1,86 @@
+/*
+ * Blackfin On-Chip Sport Emulated UART Driver
+ *
+ * Copyright 2006-2008 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+/*
+ * This driver and the hardware supported are in term of EE-191 of ADI.
+ * http://www.analog.com/static/imported-files/application_notes/EE191.pdf 
+ * This application note describe how to implement a UART on a Sharc DSP,
+ * but this driver is implemented on Blackfin Processor.
+ * Transmit Frame Sync is not used by this driver to transfer data out.
+ */
+
+#ifndef _BFIN_SPORT_UART_H
+#define _BFIN_SPORT_UART_H
+
+#define OFFSET_TCR1             0x00    /* Transmit Configuration 1 Register */
+#define OFFSET_TCR2             0x04    /* Transmit Configuration 2 Register */
+#define OFFSET_TCLKDIV          0x08    /* Transmit Serial Clock Divider Register */
+#define OFFSET_TFSDIV           0x0C    /* Transmit Frame Sync Divider Register */
+#define OFFSET_TX               0x10    /* Transmit Data Register               */
+#define OFFSET_RX               0x18    /* Receive Data Register                */
+#define OFFSET_RCR1             0x20    /* Receive Configuration 1 Register     */
+#define OFFSET_RCR2             0x24    /* Receive Configuration 2 Register     */
+#define OFFSET_RCLKDIV          0x28    /* Receive Serial Clock Divider Register */
+#define OFFSET_RFSDIV           0x2c    /* Receive Frame Sync Divider Register */
+#define OFFSET_STAT             0x30    /* Status Register                      */
+
+#define SPORT_GET_TCR1(sport)           bfin_read16(((sport)->port.membase + OFFSET_TCR1))
+#define SPORT_GET_TCR2(sport)           bfin_read16(((sport)->port.membase + OFFSET_TCR2))
+#define SPORT_GET_TCLKDIV(sport)        bfin_read16(((sport)->port.membase + OFFSET_TCLKDIV))
+#define SPORT_GET_TFSDIV(sport)         bfin_read16(((sport)->port.membase + OFFSET_TFSDIV))
+#define SPORT_GET_TX(sport)             bfin_read16(((sport)->port.membase + OFFSET_TX))
+#define SPORT_GET_RX(sport)             bfin_read16(((sport)->port.membase + OFFSET_RX))
+/*
+ * If another interrupt fires while doing a 32-bit read from RX FIFO,
+ * a fake RX underflow error will be generated.  So disable interrupts
+ * to prevent interruption while reading the FIFO.
+ */
+#define SPORT_GET_RX32(sport) \
+({ \
+        unsigned int __ret; \
+        if (ANOMALY_05000473) \
+                local_irq_disable(); \
+        __ret = bfin_read32((sport)->port.membase + OFFSET_RX); \
+        if (ANOMALY_05000473) \
+                local_irq_enable(); \
+        __ret; \
+})
+#define SPORT_GET_RCR1(sport)           bfin_read16(((sport)->port.membase + OFFSET_RCR1))
+#define SPORT_GET_RCR2(sport)           bfin_read16(((sport)->port.membase + OFFSET_RCR2))
+#define SPORT_GET_RCLKDIV(sport)        bfin_read16(((sport)->port.membase + OFFSET_RCLKDIV))
+#define SPORT_GET_RFSDIV(sport)         bfin_read16(((sport)->port.membase + OFFSET_RFSDIV))
+#define SPORT_GET_STAT(sport)           bfin_read16(((sport)->port.membase + OFFSET_STAT))
+
+#define SPORT_PUT_TCR1(sport, v)        bfin_write16(((sport)->port.membase + OFFSET_TCR1), v)
+#define SPORT_PUT_TCR2(sport, v)        bfin_write16(((sport)->port.membase + OFFSET_TCR2), v)
+#define SPORT_PUT_TCLKDIV(sport, v)     bfin_write16(((sport)->port.membase + OFFSET_TCLKDIV), v)
+#define SPORT_PUT_TFSDIV(sport, v)      bfin_write16(((sport)->port.membase + OFFSET_TFSDIV), v)
+#define SPORT_PUT_TX(sport, v)          bfin_write16(((sport)->port.membase + OFFSET_TX), v)
+#define SPORT_PUT_RX(sport, v)          bfin_write16(((sport)->port.membase + OFFSET_RX), v)
+#define SPORT_PUT_RCR1(sport, v)        bfin_write16(((sport)->port.membase + OFFSET_RCR1), v)
+#define SPORT_PUT_RCR2(sport, v)        bfin_write16(((sport)->port.membase + OFFSET_RCR2), v)
+#define SPORT_PUT_RCLKDIV(sport, v)     bfin_write16(((sport)->port.membase + OFFSET_RCLKDIV), v)
+#define SPORT_PUT_RFSDIV(sport, v)      bfin_write16(((sport)->port.membase + OFFSET_RFSDIV), v)
+#define SPORT_PUT_STAT(sport, v)        bfin_write16(((sport)->port.membase + OFFSET_STAT), v)
+
+#define SPORT_TX_FIFO_SIZE      8
+
+#define SPORT_UART_GET_CTS(x)           gpio_get_value(x->cts_pin)
+#define SPORT_UART_DISABLE_RTS(x)       gpio_set_value(x->rts_pin, 1)
+#define SPORT_UART_ENABLE_RTS(x)        gpio_set_value(x->rts_pin, 0)
+
+#if defined(CONFIG_SERIAL_BFIN_SPORT0_UART_CTSRTS) \
+        || defined(CONFIG_SERIAL_BFIN_SPORT1_UART_CTSRTS) \
+        || defined(CONFIG_SERIAL_BFIN_SPORT2_UART_CTSRTS) \
+        || defined(CONFIG_SERIAL_BFIN_SPORT3_UART_CTSRTS)
+# define CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+#endif
+
+#endif /* _BFIN_SPORT_UART_H */
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
new file mode 100644
index 000000000000..e6c3dbd781d6
--- /dev/null
+++ b/drivers/tty/serial/clps711x.c
@@ -0,0 +1,577 @@
+/*
+ *  Driver for CLPS711x serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright 1999 ARM Limited
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if defined(CONFIG_SERIAL_CLPS711X_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+#include <asm/hardware/clps7111.h>
+
+#define UART_NR         2
+
+#define SERIAL_CLPS711X_MAJOR   204
+#define SERIAL_CLPS711X_MINOR   40
+#define SERIAL_CLPS711X_NR      UART_NR
+
+/*
+ * We use the relevant SYSCON register as a base address for these ports.
+ */
+#define UBRLCR(port)            ((port)->iobase + UBRLCR1 - SYSCON1)
+#define UARTDR(port)            ((port)->iobase + UARTDR1 - SYSCON1)
+#define SYSFLG(port)            ((port)->iobase + SYSFLG1 - SYSCON1)
+#define SYSCON(port)            ((port)->iobase + SYSCON1 - SYSCON1)
+
+#define TX_IRQ(port)            ((port)->irq)
+#define RX_IRQ(port)            ((port)->irq + 1)
+
+#define UART_ANY_ERR            (UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR)
+
+#define tx_enabled(port)        ((port)->unused[0])
+
+static void clps711xuart_stop_tx(struct uart_port *port)
+{
+        if (tx_enabled(port)) {
+                disable_irq(TX_IRQ(port));
+                tx_enabled(port) = 0;
+        }
+}
+
+static void clps711xuart_start_tx(struct uart_port *port)
+{
+        if (!tx_enabled(port)) {
+                enable_irq(TX_IRQ(port));
+                tx_enabled(port) = 1;
+        }
+}
+
+static void clps711xuart_stop_rx(struct uart_port *port)
+{
+        disable_irq(RX_IRQ(port));
+}
+
+static void clps711xuart_enable_ms(struct uart_port *port)
+{
+}
+
+static irqreturn_t clps711xuart_int_rx(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned int status, ch, flg;
+
+        status = clps_readl(SYSFLG(port));
+        while (!(status & SYSFLG_URXFE)) {
+                ch = clps_readl(UARTDR(port));
+
+                port->icount.rx++;
+
+                flg = TTY_NORMAL;
+
+                /*
+                 * Note that the error handling code is
+                 * out of the main execution path
+                 */
+                if (unlikely(ch & UART_ANY_ERR)) {
+                        if (ch & UARTDR_PARERR)
+                                port->icount.parity++;
+                        else if (ch & UARTDR_FRMERR)
+                                port->icount.frame++;
+                        if (ch & UARTDR_OVERR)
+                                port->icount.overrun++;
+
+                        ch &= port->read_status_mask;
+
+                        if (ch & UARTDR_PARERR)
+                                flg = TTY_PARITY;
+                        else if (ch & UARTDR_FRMERR)
+                                flg = TTY_FRAME;
+
+#ifdef SUPPORT_SYSRQ
+                        port->sysrq = 0;
+#endif
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        goto ignore_char;
+
+                /*
+                 * CHECK: does overrun affect the current character?
+                 * ASSUMPTION: it does not.
+                 */
+                uart_insert_char(port, ch, UARTDR_OVERR, ch, flg);
+
+        ignore_char:
+                status = clps_readl(SYSFLG(port));
+        }
+        tty_flip_buffer_push(tty);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t clps711xuart_int_tx(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct circ_buf *xmit = &port->state->xmit;
+        int count;
+
+        if (port->x_char) {
+                clps_writel(port->x_char, UARTDR(port));
+                port->icount.tx++;
+                port->x_char = 0;
+                return IRQ_HANDLED;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                clps711xuart_stop_tx(port);
+                return IRQ_HANDLED;
+        }
+
+        count = port->fifosize >> 1;
+        do {
+                clps_writel(xmit->buf[xmit->tail], UARTDR(port));
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                clps711xuart_stop_tx(port);
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int clps711xuart_tx_empty(struct uart_port *port)
+{
+        unsigned int status = clps_readl(SYSFLG(port));
+        return status & SYSFLG_UBUSY ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int clps711xuart_get_mctrl(struct uart_port *port)
+{
+        unsigned int port_addr;
+        unsigned int result = 0;
+        unsigned int status;
+
+        port_addr = SYSFLG(port);
+        if (port_addr == SYSFLG1) {
+                status = clps_readl(SYSFLG1);
+                if (status & SYSFLG1_DCD)
+                        result |= TIOCM_CAR;
+                if (status & SYSFLG1_DSR)
+                        result |= TIOCM_DSR;
+                if (status & SYSFLG1_CTS)
+                        result |= TIOCM_CTS;
+        }
+
+        return result;
+}
+
+static void
+clps711xuart_set_mctrl_null(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static void clps711xuart_break_ctl(struct uart_port *port, int break_state)
+{
+        unsigned long flags;
+        unsigned int ubrlcr;
+
+        spin_lock_irqsave(&port->lock, flags);
+        ubrlcr = clps_readl(UBRLCR(port));
+        if (break_state == -1)
+                ubrlcr |= UBRLCR_BREAK;
+        else
+                ubrlcr &= ~UBRLCR_BREAK;
+        clps_writel(ubrlcr, UBRLCR(port));
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int clps711xuart_startup(struct uart_port *port)
+{
+        unsigned int syscon;
+        int retval;
+
+        tx_enabled(port) = 1;
+
+        /*
+         * Allocate the IRQs
+         */
+        retval = request_irq(TX_IRQ(port), clps711xuart_int_tx, 0,
+                             "clps711xuart_tx", port);
+        if (retval)
+                return retval;
+
+        retval = request_irq(RX_IRQ(port), clps711xuart_int_rx, 0,
+                             "clps711xuart_rx", port);
+        if (retval) {
+                free_irq(TX_IRQ(port), port);
+                return retval;
+        }
+
+        /*
+         * enable the port
+         */
+        syscon = clps_readl(SYSCON(port));
+        syscon |= SYSCON_UARTEN;
+        clps_writel(syscon, SYSCON(port));
+
+        return 0;
+}
+
+static void clps711xuart_shutdown(struct uart_port *port)
+{
+        unsigned int ubrlcr, syscon;
+
+        /*
+         * Free the interrupt
+         */
+        free_irq(TX_IRQ(port), port);   /* TX interrupt */
+        free_irq(RX_IRQ(port), port);   /* RX interrupt */
+
+        /*
+         * disable the port
+         */
+        syscon = clps_readl(SYSCON(port));
+        syscon &= ~SYSCON_UARTEN;
+        clps_writel(syscon, SYSCON(port));
+
+        /*
+         * disable break condition and fifos
+         */
+        ubrlcr = clps_readl(UBRLCR(port));
+        ubrlcr &= ~(UBRLCR_FIFOEN | UBRLCR_BREAK);
+        clps_writel(ubrlcr, UBRLCR(port));
+}
+
+static void
+clps711xuart_set_termios(struct uart_port *port, struct ktermios *termios,
+                         struct ktermios *old)
+{
+        unsigned int ubrlcr, baud, quot;
+        unsigned long flags;
+
+        /*
+         * We don't implement CREAD.
+         */
+        termios->c_cflag |= CREAD;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+        quot = uart_get_divisor(port, baud);
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                ubrlcr = UBRLCR_WRDLEN5;
+                break;
+        case CS6:
+                ubrlcr = UBRLCR_WRDLEN6;
+                break;
+        case CS7:
+                ubrlcr = UBRLCR_WRDLEN7;
+                break;
+        default: // CS8
+                ubrlcr = UBRLCR_WRDLEN8;
+                break;
+        }
+        if (termios->c_cflag & CSTOPB)
+                ubrlcr |= UBRLCR_XSTOP;
+        if (termios->c_cflag & PARENB) {
+                ubrlcr |= UBRLCR_PRTEN;
+                if (!(termios->c_cflag & PARODD))
+                        ubrlcr |= UBRLCR_EVENPRT;
+        }
+        if (port->fifosize > 1)
+                ubrlcr |= UBRLCR_FIFOEN;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        port->read_status_mask = UARTDR_OVERR;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= UARTDR_PARERR | UARTDR_FRMERR;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= UARTDR_FRMERR | UARTDR_PARERR;
+        if (termios->c_iflag & IGNBRK) {
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns to (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= UARTDR_OVERR;
+        }
+
+        quot -= 1;
+
+        clps_writel(ubrlcr | quot, UBRLCR(port));
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *clps711xuart_type(struct uart_port *port)
+{
+        return port->type == PORT_CLPS711X ? "CLPS711x" : NULL;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void clps711xuart_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE)
+                port->type = PORT_CLPS711X;
+}
+
+static void clps711xuart_release_port(struct uart_port *port)
+{
+}
+
+static int clps711xuart_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static struct uart_ops clps711x_pops = {
+        .tx_empty       = clps711xuart_tx_empty,
+        .set_mctrl      = clps711xuart_set_mctrl_null,
+        .get_mctrl      = clps711xuart_get_mctrl,
+        .stop_tx        = clps711xuart_stop_tx,
+        .start_tx       = clps711xuart_start_tx,
+        .stop_rx        = clps711xuart_stop_rx,
+        .enable_ms      = clps711xuart_enable_ms,
+        .break_ctl      = clps711xuart_break_ctl,
+        .startup        = clps711xuart_startup,
+        .shutdown       = clps711xuart_shutdown,
+        .set_termios    = clps711xuart_set_termios,
+        .type           = clps711xuart_type,
+        .config_port    = clps711xuart_config_port,
+        .release_port   = clps711xuart_release_port,
+        .request_port   = clps711xuart_request_port,
+};
+
+static struct uart_port clps711x_ports[UART_NR] = {
+        {
+                .iobase         = SYSCON1,
+                .irq            = IRQ_UTXINT1, /* IRQ_URXINT1, IRQ_UMSINT */
+                .uartclk        = 3686400,
+                .fifosize       = 16,
+                .ops            = &clps711x_pops,
+                .line           = 0,
+                .flags          = UPF_BOOT_AUTOCONF,
+        },
+        {
+                .iobase         = SYSCON2,
+                .irq            = IRQ_UTXINT2, /* IRQ_URXINT2 */
+                .uartclk        = 3686400,
+                .fifosize       = 16,
+                .ops            = &clps711x_pops,
+                .line           = 1,
+                .flags          = UPF_BOOT_AUTOCONF,
+        }
+};
+
+#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
+static void clps711xuart_console_putchar(struct uart_port *port, int ch)
+{
+        while (clps_readl(SYSFLG(port)) & SYSFLG_UTXFF)
+                barrier();
+        clps_writel(ch, UARTDR(port));
+}
+
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ *
+ *      The console_lock must be held when we get here.
+ *
+ *      Note that this is called with interrupts already disabled
+ */
+static void
+clps711xuart_console_write(struct console *co, const char *s,
+                           unsigned int count)
+{
+        struct uart_port *port = clps711x_ports + co->index;
+        unsigned int status, syscon;
+
+        /*
+         *      Ensure that the port is enabled.
+         */
+        syscon = clps_readl(SYSCON(port));
+        clps_writel(syscon | SYSCON_UARTEN, SYSCON(port));
+
+        uart_console_write(port, s, count, clps711xuart_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the uart state.
+         */
+        do {
+                status = clps_readl(SYSFLG(port));
+        } while (status & SYSFLG_UBUSY);
+
+        clps_writel(syscon, SYSCON(port));
+}
+
+static void __init
+clps711xuart_console_get_options(struct uart_port *port, int *baud,
+                                 int *parity, int *bits)
+{
+        if (clps_readl(SYSCON(port)) & SYSCON_UARTEN) {
+                unsigned int ubrlcr, quot;
+
+                ubrlcr = clps_readl(UBRLCR(port));
+
+                *parity = 'n';
+                if (ubrlcr & UBRLCR_PRTEN) {
+                        if (ubrlcr & UBRLCR_EVENPRT)
+                                *parity = 'e';
+                        else
+                                *parity = 'o';
+                }
+
+                if ((ubrlcr & UBRLCR_WRDLEN_MASK) == UBRLCR_WRDLEN7)
+                        *bits = 7;
+                else
+                        *bits = 8;
+
+                quot = ubrlcr & UBRLCR_BAUD_MASK;
+                *baud = port->uartclk / (16 * (quot + 1));
+        }
+}
+
+static int __init clps711xuart_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 38400;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        port = uart_get_console(clps711x_ports, UART_NR, co);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                clps711xuart_console_get_options(port, &baud, &parity, &bits);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver clps711x_reg;
+static struct console clps711x_console = {
+        .name           = "ttyCL",
+        .write          = clps711xuart_console_write,
+        .device         = uart_console_device,
+        .setup          = clps711xuart_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &clps711x_reg,
+};
+
+static int __init clps711xuart_console_init(void)
+{
+        register_console(&clps711x_console);
+        return 0;
+}
+console_initcall(clps711xuart_console_init);
+
+#define CLPS711X_CONSOLE        &clps711x_console
+#else
+#define CLPS711X_CONSOLE        NULL
+#endif
+
+static struct uart_driver clps711x_reg = {
+        .driver_name            = "ttyCL",
+        .dev_name               = "ttyCL",
+        .major                  = SERIAL_CLPS711X_MAJOR,
+        .minor                  = SERIAL_CLPS711X_MINOR,
+        .nr                     = UART_NR,
+
+        .cons                   = CLPS711X_CONSOLE,
+};
+
+static int __init clps711xuart_init(void)
+{
+        int ret, i;
+
+        printk(KERN_INFO "Serial: CLPS711x driver\n");
+
+        ret = uart_register_driver(&clps711x_reg);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < UART_NR; i++)
+                uart_add_one_port(&clps711x_reg, &clps711x_ports[i]);
+
+        return 0;
+}
+
+static void __exit clps711xuart_exit(void)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++)
+                uart_remove_one_port(&clps711x_reg, &clps711x_ports[i]);
+
+        uart_unregister_driver(&clps711x_reg);
+}
+
+module_init(clps711xuart_init);
+module_exit(clps711xuart_exit);
+
+MODULE_AUTHOR("Deep Blue Solutions Ltd");
+MODULE_DESCRIPTION("CLPS-711x generic serial driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV(SERIAL_CLPS711X_MAJOR, SERIAL_CLPS711X_MINOR);
diff --git a/drivers/tty/serial/cpm_uart/Makefile b/drivers/tty/serial/cpm_uart/Makefile
new file mode 100644
index 000000000000..e072724ea754
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart/Makefile
@@ -0,0 +1,11 @@
+#
+# Makefile for the Motorola 8xx FEC ethernet controller
+#
+
+obj-$(CONFIG_SERIAL_CPM) += cpm_uart.o
+
+# Select the correct platform objects.
+cpm_uart-objs-$(CONFIG_CPM2)    += cpm_uart_cpm2.o
+cpm_uart-objs-$(CONFIG_8xx)     += cpm_uart_cpm1.o
+
+cpm_uart-objs   := cpm_uart_core.o $(cpm_uart-objs-y)
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart.h b/drivers/tty/serial/cpm_uart/cpm_uart.h
new file mode 100644
index 000000000000..cf34d26ff6cd
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart/cpm_uart.h
@@ -0,0 +1,145 @@
+/*
+ *  Driver for CPM (SCC/SMC) serial ports
+ *
+ *  Copyright (C) 2004 Freescale Semiconductor, Inc.
+ *
+ *  2006 (c) MontaVista Software, Inc.
+ *      Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ */
+#ifndef CPM_UART_H
+#define CPM_UART_H
+
+#include <linux/platform_device.h>
+#include <linux/fs_uart_pd.h>
+
+#if defined(CONFIG_CPM2)
+#include "cpm_uart_cpm2.h"
+#elif defined(CONFIG_8xx)
+#include "cpm_uart_cpm1.h"
+#endif
+
+#define SERIAL_CPM_MAJOR        204
+#define SERIAL_CPM_MINOR        46
+
+#define IS_SMC(pinfo)           (pinfo->flags & FLAG_SMC)
+#define IS_DISCARDING(pinfo)    (pinfo->flags & FLAG_DISCARDING)
+#define FLAG_DISCARDING 0x00000004      /* when set, don't discard */
+#define FLAG_SMC        0x00000002
+#define FLAG_CONSOLE    0x00000001
+
+#define UART_SMC1       fsid_smc1_uart
+#define UART_SMC2       fsid_smc2_uart
+#define UART_SCC1       fsid_scc1_uart
+#define UART_SCC2       fsid_scc2_uart
+#define UART_SCC3       fsid_scc3_uart
+#define UART_SCC4       fsid_scc4_uart
+
+#define UART_NR         fs_uart_nr
+
+#define RX_NUM_FIFO     4
+#define RX_BUF_SIZE     32
+#define TX_NUM_FIFO     4
+#define TX_BUF_SIZE     32
+
+#define SCC_WAIT_CLOSING 100
+
+#define GPIO_CTS        0
+#define GPIO_RTS        1
+#define GPIO_DCD        2
+#define GPIO_DSR        3
+#define GPIO_DTR        4
+#define GPIO_RI         5
+
+#define NUM_GPIOS       (GPIO_RI+1)
+
+struct uart_cpm_port {
+        struct uart_port        port;
+        u16                     rx_nrfifos;
+        u16                     rx_fifosize;
+        u16                     tx_nrfifos;
+        u16                     tx_fifosize;
+        smc_t __iomem           *smcp;
+        smc_uart_t __iomem      *smcup;
+        scc_t __iomem           *sccp;
+        scc_uart_t __iomem      *sccup;
+        cbd_t __iomem           *rx_bd_base;
+        cbd_t __iomem           *rx_cur;
+        cbd_t __iomem           *tx_bd_base;
+        cbd_t __iomem           *tx_cur;
+        unsigned char           *tx_buf;
+        unsigned char           *rx_buf;
+        u32                     flags;
+        struct clk              *clk;
+        u8                      brg;
+        uint                     dp_addr;
+        void                    *mem_addr;
+        dma_addr_t               dma_addr;
+        u32                     mem_size;
+        /* wait on close if needed */
+        int                     wait_closing;
+        /* value to combine with opcode to form cpm command */
+        u32                     command;
+        int                     gpios[NUM_GPIOS];
+};
+
+extern int cpm_uart_nr;
+extern struct uart_cpm_port cpm_uart_ports[UART_NR];
+
+/* these are located in their respective files */
+void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
+void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
+                                struct device_node *np);
+void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
+int cpm_uart_init_portdesc(void);
+int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
+void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
+
+void smc1_lineif(struct uart_cpm_port *pinfo);
+void smc2_lineif(struct uart_cpm_port *pinfo);
+void scc1_lineif(struct uart_cpm_port *pinfo);
+void scc2_lineif(struct uart_cpm_port *pinfo);
+void scc3_lineif(struct uart_cpm_port *pinfo);
+void scc4_lineif(struct uart_cpm_port *pinfo);
+
+/*
+   virtual to phys transtalion
+*/
+static inline unsigned long cpu2cpm_addr(void *addr,
+                                         struct uart_cpm_port *pinfo)
+{
+        int offset;
+        u32 val = (u32)addr;
+        u32 mem = (u32)pinfo->mem_addr;
+        /* sane check */
+        if (likely(val >= mem && val < mem + pinfo->mem_size)) {
+                offset = val - mem;
+                return pinfo->dma_addr + offset;
+        }
+        /* something nasty happened */
+        BUG();
+        return 0;
+}
+
+static inline void *cpm2cpu_addr(unsigned long addr,
+                                 struct uart_cpm_port *pinfo)
+{
+        int offset;
+        u32 val = addr;
+        u32 dma = (u32)pinfo->dma_addr;
+        /* sane check */
+        if (likely(val >= dma && val < dma + pinfo->mem_size)) {
+                offset = val - dma;
+                return pinfo->mem_addr + offset;
+        }
+        /* something nasty happened */
+        BUG();
+        return NULL;
+}
+
+
+#endif /* CPM_UART_H */
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
new file mode 100644
index 000000000000..9488da74d4f7
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -0,0 +1,1440 @@
+/*
+ *  Driver for CPM (SCC/SMC) serial ports; core driver
+ *
+ *  Based on arch/ppc/cpm2_io/uart.c by Dan Malek
+ *  Based on ppc8xx.c by Thomas Gleixner
+ *  Based on drivers/serial/amba.c by Russell King
+ *
+ *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
+ *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
+ *
+ *  Copyright (C) 2004, 2007 Freescale Semiconductor, Inc.
+ *            (C) 2004 Intracom, S.A.
+ *            (C) 2005-2006 MontaVista Software, Inc.
+ *              Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/bootmem.h>
+#include <linux/dma-mapping.h>
+#include <linux/fs_uart_pd.h>
+#include <linux/of_platform.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/clk.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/delay.h>
+#include <asm/fs_pd.h>
+#include <asm/udbg.h>
+
+#if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+#include <linux/kernel.h>
+
+#include "cpm_uart.h"
+
+
+/**************************************************************/
+
+static int  cpm_uart_tx_pump(struct uart_port *port);
+static void cpm_uart_init_smc(struct uart_cpm_port *pinfo);
+static void cpm_uart_init_scc(struct uart_cpm_port *pinfo);
+static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
+
+/**************************************************************/
+
+#define HW_BUF_SPD_THRESHOLD    9600
+
+/*
+ * Check, if transmit buffers are processed
+*/
+static unsigned int cpm_uart_tx_empty(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        cbd_t __iomem *bdp = pinfo->tx_bd_base;
+        int ret = 0;
+
+        while (1) {
+                if (in_be16(&bdp->cbd_sc) & BD_SC_READY)
+                        break;
+
+                if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP) {
+                        ret = TIOCSER_TEMT;
+                        break;
+                }
+                bdp++;
+        }
+
+        pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret);
+
+        return ret;
+}
+
+static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+        if (pinfo->gpios[GPIO_RTS] >= 0)
+                gpio_set_value(pinfo->gpios[GPIO_RTS], !(mctrl & TIOCM_RTS));
+
+        if (pinfo->gpios[GPIO_DTR] >= 0)
+                gpio_set_value(pinfo->gpios[GPIO_DTR], !(mctrl & TIOCM_DTR));
+}
+
+static unsigned int cpm_uart_get_mctrl(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        unsigned int mctrl = TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+
+        if (pinfo->gpios[GPIO_CTS] >= 0) {
+                if (gpio_get_value(pinfo->gpios[GPIO_CTS]))
+                        mctrl &= ~TIOCM_CTS;
+        }
+
+        if (pinfo->gpios[GPIO_DSR] >= 0) {
+                if (gpio_get_value(pinfo->gpios[GPIO_DSR]))
+                        mctrl &= ~TIOCM_DSR;
+        }
+
+        if (pinfo->gpios[GPIO_DCD] >= 0) {
+                if (gpio_get_value(pinfo->gpios[GPIO_DCD]))
+                        mctrl &= ~TIOCM_CAR;
+        }
+
+        if (pinfo->gpios[GPIO_RI] >= 0) {
+                if (!gpio_get_value(pinfo->gpios[GPIO_RI]))
+                        mctrl |= TIOCM_RNG;
+        }
+
+        return mctrl;
+}
+
+/*
+ * Stop transmitter
+ */
+static void cpm_uart_stop_tx(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        smc_t __iomem *smcp = pinfo->smcp;
+        scc_t __iomem *sccp = pinfo->sccp;
+
+        pr_debug("CPM uart[%d]:stop tx\n", port->line);
+
+        if (IS_SMC(pinfo))
+                clrbits8(&smcp->smc_smcm, SMCM_TX);
+        else
+                clrbits16(&sccp->scc_sccm, UART_SCCM_TX);
+}
+
+/*
+ * Start transmitter
+ */
+static void cpm_uart_start_tx(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        smc_t __iomem *smcp = pinfo->smcp;
+        scc_t __iomem *sccp = pinfo->sccp;
+
+        pr_debug("CPM uart[%d]:start tx\n", port->line);
+
+        if (IS_SMC(pinfo)) {
+                if (in_8(&smcp->smc_smcm) & SMCM_TX)
+                        return;
+        } else {
+                if (in_be16(&sccp->scc_sccm) & UART_SCCM_TX)
+                        return;
+        }
+
+        if (cpm_uart_tx_pump(port) != 0) {
+                if (IS_SMC(pinfo)) {
+                        setbits8(&smcp->smc_smcm, SMCM_TX);
+                } else {
+                        setbits16(&sccp->scc_sccm, UART_SCCM_TX);
+                }
+        }
+}
+
+/*
+ * Stop receiver
+ */
+static void cpm_uart_stop_rx(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        smc_t __iomem *smcp = pinfo->smcp;
+        scc_t __iomem *sccp = pinfo->sccp;
+
+        pr_debug("CPM uart[%d]:stop rx\n", port->line);
+
+        if (IS_SMC(pinfo))
+                clrbits8(&smcp->smc_smcm, SMCM_RX);
+        else
+                clrbits16(&sccp->scc_sccm, UART_SCCM_RX);
+}
+
+/*
+ * Enable Modem status interrupts
+ */
+static void cpm_uart_enable_ms(struct uart_port *port)
+{
+        pr_debug("CPM uart[%d]:enable ms\n", port->line);
+}
+
+/*
+ * Generate a break.
+ */
+static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+        pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line,
+                break_state);
+
+        if (break_state)
+                cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
+        else
+                cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
+}
+
+/*
+ * Transmit characters, refill buffer descriptor, if possible
+ */
+static void cpm_uart_int_tx(struct uart_port *port)
+{
+        pr_debug("CPM uart[%d]:TX INT\n", port->line);
+
+        cpm_uart_tx_pump(port);
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int serial_polled;
+#endif
+
+/*
+ * Receive characters
+ */
+static void cpm_uart_int_rx(struct uart_port *port)
+{
+        int i;
+        unsigned char ch;
+        u8 *cp;
+        struct tty_struct *tty = port->state->port.tty;
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        cbd_t __iomem *bdp;
+        u16 status;
+        unsigned int flg;
+
+        pr_debug("CPM uart[%d]:RX INT\n", port->line);
+
+        /* Just loop through the closed BDs and copy the characters into
+         * the buffer.
+         */
+        bdp = pinfo->rx_cur;
+        for (;;) {
+#ifdef CONFIG_CONSOLE_POLL
+                if (unlikely(serial_polled)) {
+                        serial_polled = 0;
+                        return;
+                }
+#endif
+                /* get status */
+                status = in_be16(&bdp->cbd_sc);
+                /* If this one is empty, return happy */
+                if (status & BD_SC_EMPTY)
+                        break;
+
+                /* get number of characters, and check spce in flip-buffer */
+                i = in_be16(&bdp->cbd_datlen);
+
+                /* If we have not enough room in tty flip buffer, then we try
+                 * later, which will be the next rx-interrupt or a timeout
+                 */
+                if(tty_buffer_request_room(tty, i) < i) {
+                        printk(KERN_WARNING "No room in flip buffer\n");
+                        return;
+                }
+
+                /* get pointer */
+                cp = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
+
+                /* loop through the buffer */
+                while (i-- > 0) {
+                        ch = *cp++;
+                        port->icount.rx++;
+                        flg = TTY_NORMAL;
+
+                        if (status &
+                            (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
+                                goto handle_error;
+                        if (uart_handle_sysrq_char(port, ch))
+                                continue;
+#ifdef CONFIG_CONSOLE_POLL
+                        if (unlikely(serial_polled)) {
+                                serial_polled = 0;
+                                return;
+                        }
+#endif
+                      error_return:
+                        tty_insert_flip_char(tty, ch, flg);
+
+                }               /* End while (i--) */
+
+                /* This BD is ready to be used again. Clear status. get next */
+                clrbits16(&bdp->cbd_sc, BD_SC_BR | BD_SC_FR | BD_SC_PR |
+                                        BD_SC_OV | BD_SC_ID);
+                setbits16(&bdp->cbd_sc, BD_SC_EMPTY);
+
+                if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+                        bdp = pinfo->rx_bd_base;
+                else
+                        bdp++;
+
+        } /* End for (;;) */
+
+        /* Write back buffer pointer */
+        pinfo->rx_cur = bdp;
+
+        /* activate BH processing */
+        tty_flip_buffer_push(tty);
+
+        return;
+
+        /* Error processing */
+
+      handle_error:
+        /* Statistics */
+        if (status & BD_SC_BR)
+                port->icount.brk++;
+        if (status & BD_SC_PR)
+                port->icount.parity++;
+        if (status & BD_SC_FR)
+                port->icount.frame++;
+        if (status & BD_SC_OV)
+                port->icount.overrun++;
+
+        /* Mask out ignored conditions */
+        status &= port->read_status_mask;
+
+        /* Handle the remaining ones */
+        if (status & BD_SC_BR)
+                flg = TTY_BREAK;
+        else if (status & BD_SC_PR)
+                flg = TTY_PARITY;
+        else if (status & BD_SC_FR)
+                flg = TTY_FRAME;
+
+        /* overrun does not affect the current character ! */
+        if (status & BD_SC_OV) {
+                ch = 0;
+                flg = TTY_OVERRUN;
+                /* We skip this buffer */
+                /* CHECK: Is really nothing senseful there */
+                /* ASSUMPTION: it contains nothing valid */
+                i = 0;
+        }
+#ifdef SUPPORT_SYSRQ
+        port->sysrq = 0;
+#endif
+        goto error_return;
+}
+
+/*
+ * Asynchron mode interrupt handler
+ */
+static irqreturn_t cpm_uart_int(int irq, void *data)
+{
+        u8 events;
+        struct uart_port *port = data;
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        smc_t __iomem *smcp = pinfo->smcp;
+        scc_t __iomem *sccp = pinfo->sccp;
+
+        pr_debug("CPM uart[%d]:IRQ\n", port->line);
+
+        if (IS_SMC(pinfo)) {
+                events = in_8(&smcp->smc_smce);
+                out_8(&smcp->smc_smce, events);
+                if (events & SMCM_BRKE)
+                        uart_handle_break(port);
+                if (events & SMCM_RX)
+                        cpm_uart_int_rx(port);
+                if (events & SMCM_TX)
+                        cpm_uart_int_tx(port);
+        } else {
+                events = in_be16(&sccp->scc_scce);
+                out_be16(&sccp->scc_scce, events);
+                if (events & UART_SCCM_BRKE)
+                        uart_handle_break(port);
+                if (events & UART_SCCM_RX)
+                        cpm_uart_int_rx(port);
+                if (events & UART_SCCM_TX)
+                        cpm_uart_int_tx(port);
+        }
+        return (events) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int cpm_uart_startup(struct uart_port *port)
+{
+        int retval;
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+        pr_debug("CPM uart[%d]:startup\n", port->line);
+
+        /* If the port is not the console, make sure rx is disabled. */
+        if (!(pinfo->flags & FLAG_CONSOLE)) {
+                /* Disable UART rx */
+                if (IS_SMC(pinfo)) {
+                        clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN);
+                        clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
+                } else {
+                        clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR);
+                        clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
+                }
+                cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
+        }
+        /* Install interrupt handler. */
+        retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port);
+        if (retval)
+                return retval;
+
+        /* Startup rx-int */
+        if (IS_SMC(pinfo)) {
+                setbits8(&pinfo->smcp->smc_smcm, SMCM_RX);
+                setbits16(&pinfo->smcp->smc_smcmr, (SMCMR_REN | SMCMR_TEN));
+        } else {
+                setbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX);
+                setbits32(&pinfo->sccp->scc_gsmrl, (SCC_GSMRL_ENR | SCC_GSMRL_ENT));
+        }
+
+        return 0;
+}
+
+inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo)
+{
+        set_current_state(TASK_UNINTERRUPTIBLE);
+        schedule_timeout(pinfo->wait_closing);
+}
+
+/*
+ * Shutdown the uart
+ */
+static void cpm_uart_shutdown(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+        pr_debug("CPM uart[%d]:shutdown\n", port->line);
+
+        /* free interrupt handler */
+        free_irq(port->irq, port);
+
+        /* If the port is not the console, disable Rx and Tx. */
+        if (!(pinfo->flags & FLAG_CONSOLE)) {
+                /* Wait for all the BDs marked sent */
+                while(!cpm_uart_tx_empty(port)) {
+                        set_current_state(TASK_UNINTERRUPTIBLE);
+                        schedule_timeout(2);
+                }
+
+                if (pinfo->wait_closing)
+                        cpm_uart_wait_until_send(pinfo);
+
+                /* Stop uarts */
+                if (IS_SMC(pinfo)) {
+                        smc_t __iomem *smcp = pinfo->smcp;
+                        clrbits16(&smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+                        clrbits8(&smcp->smc_smcm, SMCM_RX | SMCM_TX);
+                } else {
+                        scc_t __iomem *sccp = pinfo->sccp;
+                        clrbits32(&sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+                        clrbits16(&sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
+                }
+
+                /* Shut them really down and reinit buffer descriptors */
+                if (IS_SMC(pinfo)) {
+                        out_be16(&pinfo->smcup->smc_brkcr, 0);
+                        cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
+                } else {
+                        out_be16(&pinfo->sccup->scc_brkcr, 0);
+                        cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
+                }
+
+                cpm_uart_initbd(pinfo);
+        }
+}
+
+static void cpm_uart_set_termios(struct uart_port *port,
+                                 struct ktermios *termios,
+                                 struct ktermios *old)
+{
+        int baud;
+        unsigned long flags;
+        u16 cval, scval, prev_mode;
+        int bits, sbits;
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        smc_t __iomem *smcp = pinfo->smcp;
+        scc_t __iomem *sccp = pinfo->sccp;
+
+        pr_debug("CPM uart[%d]:set_termios\n", port->line);
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+        if (baud <= HW_BUF_SPD_THRESHOLD ||
+            (pinfo->port.state && pinfo->port.state->port.tty->low_latency))
+                pinfo->rx_fifosize = 1;
+        else
+                pinfo->rx_fifosize = RX_BUF_SIZE;
+
+        /* Character length programmed into the mode register is the
+         * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
+         * 1 or 2 stop bits, minus 1.
+         * The value 'bits' counts this for us.
+         */
+        cval = 0;
+        scval = 0;
+
+        /* byte size */
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                bits = 5;
+                break;
+        case CS6:
+                bits = 6;
+                break;
+        case CS7:
+                bits = 7;
+                break;
+        case CS8:
+                bits = 8;
+                break;
+                /* Never happens, but GCC is too dumb to figure it out */
+        default:
+                bits = 8;
+                break;
+        }
+        sbits = bits - 5;
+
+        if (termios->c_cflag & CSTOPB) {
+                cval |= SMCMR_SL;       /* Two stops */
+                scval |= SCU_PSMR_SL;
+                bits++;
+        }
+
+        if (termios->c_cflag & PARENB) {
+                cval |= SMCMR_PEN;
+                scval |= SCU_PSMR_PEN;
+                bits++;
+                if (!(termios->c_cflag & PARODD)) {
+                        cval |= SMCMR_PM_EVEN;
+                        scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP);
+                }
+        }
+
+        /*
+         * Update the timeout
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /*
+         * Set up parity check flag
+         */
+#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+
+        port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV);
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= BD_SC_FR | BD_SC_PR;
+        if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK))
+                port->read_status_mask |= BD_SC_BR;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= BD_SC_BR;
+                /*
+                 * If we're ignore parity and break indicators, ignore
+                 * overruns too.  (For real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= BD_SC_OV;
+        }
+        /*
+         * !!! ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->read_status_mask &= ~BD_SC_EMPTY;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Start bit has not been added (so don't, because we would just
+         * subtract it later), and we need to add one for the number of
+         * stops bits (there is always at least one).
+         */
+        bits++;
+        if (IS_SMC(pinfo)) {
+                /*
+                 * MRBLR can be changed while an SMC/SCC is operating only
+                 * if it is done in a single bus cycle with one 16-bit move
+                 * (not two 8-bit bus cycles back-to-back). This occurs when
+                 * the cp shifts control to the next RxBD, so the change does
+                 * not take effect immediately. To guarantee the exact RxBD
+                 * on which the change occurs, change MRBLR only while the
+                 * SMC/SCC receiver is disabled.
+                 */
+                out_be16(&pinfo->smcup->smc_mrblr, pinfo->rx_fifosize);
+
+                /* Set the mode register.  We want to keep a copy of the
+                 * enables, because we want to put them back if they were
+                 * present.
+                 */
+                prev_mode = in_be16(&smcp->smc_smcmr) & (SMCMR_REN | SMCMR_TEN);
+                /* Output in *one* operation, so we don't interrupt RX/TX if they
+                 * were already enabled. */
+                out_be16(&smcp->smc_smcmr, smcr_mk_clen(bits) | cval |
+                    SMCMR_SM_UART | prev_mode);
+        } else {
+                out_be16(&pinfo->sccup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
+                out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
+        }
+
+        if (pinfo->clk)
+                clk_set_rate(pinfo->clk, baud);
+        else
+                cpm_set_brg(pinfo->brg - 1, baud);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *cpm_uart_type(struct uart_port *port)
+{
+        pr_debug("CPM uart[%d]:uart_type\n", port->line);
+
+        return port->type == PORT_CPM ? "CPM UART" : NULL;
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int cpm_uart_verify_port(struct uart_port *port,
+                                struct serial_struct *ser)
+{
+        int ret = 0;
+
+        pr_debug("CPM uart[%d]:verify_port\n", port->line);
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
+                ret = -EINVAL;
+        if (ser->irq < 0 || ser->irq >= nr_irqs)
+                ret = -EINVAL;
+        if (ser->baud_base < 9600)
+                ret = -EINVAL;
+        return ret;
+}
+
+/*
+ * Transmit characters, refill buffer descriptor, if possible
+ */
+static int cpm_uart_tx_pump(struct uart_port *port)
+{
+        cbd_t __iomem *bdp;
+        u8 *p;
+        int count;
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        struct circ_buf *xmit = &port->state->xmit;
+
+        /* Handle xon/xoff */
+        if (port->x_char) {
+                /* Pick next descriptor and fill from buffer */
+                bdp = pinfo->tx_cur;
+
+                p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
+
+                *p++ = port->x_char;
+
+                out_be16(&bdp->cbd_datlen, 1);
+                setbits16(&bdp->cbd_sc, BD_SC_READY);
+                /* Get next BD. */
+                if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+                        bdp = pinfo->tx_bd_base;
+                else
+                        bdp++;
+                pinfo->tx_cur = bdp;
+
+                port->icount.tx++;
+                port->x_char = 0;
+                return 1;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                cpm_uart_stop_tx(port);
+                return 0;
+        }
+
+        /* Pick next descriptor and fill from buffer */
+        bdp = pinfo->tx_cur;
+
+        while (!(in_be16(&bdp->cbd_sc) & BD_SC_READY) &&
+               xmit->tail != xmit->head) {
+                count = 0;
+                p = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr), pinfo);
+                while (count < pinfo->tx_fifosize) {
+                        *p++ = xmit->buf[xmit->tail];
+                        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                        port->icount.tx++;
+                        count++;
+                        if (xmit->head == xmit->tail)
+                                break;
+                }
+                out_be16(&bdp->cbd_datlen, count);
+                setbits16(&bdp->cbd_sc, BD_SC_READY);
+                /* Get next BD. */
+                if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+                        bdp = pinfo->tx_bd_base;
+                else
+                        bdp++;
+        }
+        pinfo->tx_cur = bdp;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit)) {
+                cpm_uart_stop_tx(port);
+                return 0;
+        }
+
+        return 1;
+}
+
+/*
+ * init buffer descriptors
+ */
+static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
+{
+        int i;
+        u8 *mem_addr;
+        cbd_t __iomem *bdp;
+
+        pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line);
+
+        /* Set the physical address of the host memory
+         * buffers in the buffer descriptors, and the
+         * virtual address for us to work with.
+         */
+        mem_addr = pinfo->mem_addr;
+        bdp = pinfo->rx_cur = pinfo->rx_bd_base;
+        for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
+                out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+                out_be16(&bdp->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT);
+                mem_addr += pinfo->rx_fifosize;
+        }
+
+        out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+        out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT);
+
+        /* Set the physical address of the host memory
+         * buffers in the buffer descriptors, and the
+         * virtual address for us to work with.
+         */
+        mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
+        bdp = pinfo->tx_cur = pinfo->tx_bd_base;
+        for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
+                out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+                out_be16(&bdp->cbd_sc, BD_SC_INTRPT);
+                mem_addr += pinfo->tx_fifosize;
+        }
+
+        out_be32(&bdp->cbd_bufaddr, cpu2cpm_addr(mem_addr, pinfo));
+        out_be16(&bdp->cbd_sc, BD_SC_WRAP | BD_SC_INTRPT);
+}
+
+static void cpm_uart_init_scc(struct uart_cpm_port *pinfo)
+{
+        scc_t __iomem *scp;
+        scc_uart_t __iomem *sup;
+
+        pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line);
+
+        scp = pinfo->sccp;
+        sup = pinfo->sccup;
+
+        /* Store address */
+        out_be16(&pinfo->sccup->scc_genscc.scc_rbase,
+                 (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
+        out_be16(&pinfo->sccup->scc_genscc.scc_tbase,
+                 (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
+
+        /* Set up the uart parameters in the
+         * parameter ram.
+         */
+
+        cpm_set_scc_fcr(sup);
+
+        out_be16(&sup->scc_genscc.scc_mrblr, pinfo->rx_fifosize);
+        out_be16(&sup->scc_maxidl, pinfo->rx_fifosize);
+        out_be16(&sup->scc_brkcr, 1);
+        out_be16(&sup->scc_parec, 0);
+        out_be16(&sup->scc_frmec, 0);
+        out_be16(&sup->scc_nosec, 0);
+        out_be16(&sup->scc_brkec, 0);
+        out_be16(&sup->scc_uaddr1, 0);
+        out_be16(&sup->scc_uaddr2, 0);
+        out_be16(&sup->scc_toseq, 0);
+        out_be16(&sup->scc_char1, 0x8000);
+        out_be16(&sup->scc_char2, 0x8000);
+        out_be16(&sup->scc_char3, 0x8000);
+        out_be16(&sup->scc_char4, 0x8000);
+        out_be16(&sup->scc_char5, 0x8000);
+        out_be16(&sup->scc_char6, 0x8000);
+        out_be16(&sup->scc_char7, 0x8000);
+        out_be16(&sup->scc_char8, 0x8000);
+        out_be16(&sup->scc_rccm, 0xc0ff);
+
+        /* Send the CPM an initialize command.
+         */
+        cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
+
+        /* Set UART mode, 8 bit, no parity, one stop.
+         * Enable receive and transmit.
+         */
+        out_be32(&scp->scc_gsmrh, 0);
+        out_be32(&scp->scc_gsmrl,
+                 SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
+
+        /* Enable rx interrupts  and clear all pending events.  */
+        out_be16(&scp->scc_sccm, 0);
+        out_be16(&scp->scc_scce, 0xffff);
+        out_be16(&scp->scc_dsr, 0x7e7e);
+        out_be16(&scp->scc_psmr, 0x3000);
+
+        setbits32(&scp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+}
+
+static void cpm_uart_init_smc(struct uart_cpm_port *pinfo)
+{
+        smc_t __iomem *sp;
+        smc_uart_t __iomem *up;
+
+        pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line);
+
+        sp = pinfo->smcp;
+        up = pinfo->smcup;
+
+        /* Store address */
+        out_be16(&pinfo->smcup->smc_rbase,
+                 (u8 __iomem *)pinfo->rx_bd_base - DPRAM_BASE);
+        out_be16(&pinfo->smcup->smc_tbase,
+                 (u8 __iomem *)pinfo->tx_bd_base - DPRAM_BASE);
+
+/*
+ *  In case SMC1 is being relocated...
+ */
+#if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH)
+        out_be16(&up->smc_rbptr, in_be16(&pinfo->smcup->smc_rbase));
+        out_be16(&up->smc_tbptr, in_be16(&pinfo->smcup->smc_tbase));
+        out_be32(&up->smc_rstate, 0);
+        out_be32(&up->smc_tstate, 0);
+        out_be16(&up->smc_brkcr, 1);              /* number of break chars */
+        out_be16(&up->smc_brkec, 0);
+#endif
+
+        /* Set up the uart parameters in the
+         * parameter ram.
+         */
+        cpm_set_smc_fcr(up);
+
+        /* Using idle character time requires some additional tuning.  */
+        out_be16(&up->smc_mrblr, pinfo->rx_fifosize);
+        out_be16(&up->smc_maxidl, pinfo->rx_fifosize);
+        out_be16(&up->smc_brklen, 0);
+        out_be16(&up->smc_brkec, 0);
+        out_be16(&up->smc_brkcr, 1);
+
+        cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX);
+
+        /* Set UART mode, 8 bit, no parity, one stop.
+         * Enable receive and transmit.
+         */
+        out_be16(&sp->smc_smcmr, smcr_mk_clen(9) | SMCMR_SM_UART);
+
+        /* Enable only rx interrupts clear all pending events. */
+        out_8(&sp->smc_smcm, 0);
+        out_8(&sp->smc_smce, 0xff);
+
+        setbits16(&sp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+}
+
+/*
+ * Initialize port. This is called from early_console stuff
+ * so we have to be careful here !
+ */
+static int cpm_uart_request_port(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        int ret;
+
+        pr_debug("CPM uart[%d]:request port\n", port->line);
+
+        if (pinfo->flags & FLAG_CONSOLE)
+                return 0;
+
+        if (IS_SMC(pinfo)) {
+                clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
+                clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+        } else {
+                clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
+                clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+        }
+
+        ret = cpm_uart_allocbuf(pinfo, 0);
+
+        if (ret)
+                return ret;
+
+        cpm_uart_initbd(pinfo);
+        if (IS_SMC(pinfo))
+                cpm_uart_init_smc(pinfo);
+        else
+                cpm_uart_init_scc(pinfo);
+
+        return 0;
+}
+
+static void cpm_uart_release_port(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+        if (!(pinfo->flags & FLAG_CONSOLE))
+                cpm_uart_freebuf(pinfo);
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void cpm_uart_config_port(struct uart_port *port, int flags)
+{
+        pr_debug("CPM uart[%d]:config_port\n", port->line);
+
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_CPM;
+                cpm_uart_request_port(port);
+        }
+}
+
+#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_CPM_CONSOLE)
+/*
+ * Write a string to the serial port
+ * Note that this is called with interrupts already disabled
+ */
+static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
+                const char *string, u_int count)
+{
+        unsigned int i;
+        cbd_t __iomem *bdp, *bdbase;
+        unsigned char *cpm_outp_addr;
+
+        /* Get the address of the host memory buffer.
+         */
+        bdp = pinfo->tx_cur;
+        bdbase = pinfo->tx_bd_base;
+
+        /*
+         * Now, do each character.  This is not as bad as it looks
+         * since this is a holding FIFO and not a transmitting FIFO.
+         * We could add the complexity of filling the entire transmit
+         * buffer, but we would just wait longer between accesses......
+         */
+        for (i = 0; i < count; i++, string++) {
+                /* Wait for transmitter fifo to empty.
+                 * Ready indicates output is ready, and xmt is doing
+                 * that, not that it is ready for us to send.
+                 */
+                while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
+                        ;
+
+                /* Send the character out.
+                 * If the buffer address is in the CPM DPRAM, don't
+                 * convert it.
+                 */
+                cpm_outp_addr = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr),
+                                        pinfo);
+                *cpm_outp_addr = *string;
+
+                out_be16(&bdp->cbd_datlen, 1);
+                setbits16(&bdp->cbd_sc, BD_SC_READY);
+
+                if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+                        bdp = bdbase;
+                else
+                        bdp++;
+
+                /* if a LF, also do CR... */
+                if (*string == 10) {
+                        while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
+                                ;
+
+                        cpm_outp_addr = cpm2cpu_addr(in_be32(&bdp->cbd_bufaddr),
+                                                pinfo);
+                        *cpm_outp_addr = 13;
+
+                        out_be16(&bdp->cbd_datlen, 1);
+                        setbits16(&bdp->cbd_sc, BD_SC_READY);
+
+                        if (in_be16(&bdp->cbd_sc) & BD_SC_WRAP)
+                                bdp = bdbase;
+                        else
+                                bdp++;
+                }
+        }
+
+        /*
+         * Finally, Wait for transmitter & holding register to empty
+         *  and restore the IER
+         */
+        while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
+                ;
+
+        pinfo->tx_cur = bdp;
+}
+#endif
+
+#ifdef CONFIG_CONSOLE_POLL
+/* Serial polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+#define GDB_BUF_SIZE    512     /* power of 2, please */
+
+static char poll_buf[GDB_BUF_SIZE];
+static char *pollp;
+static int poll_chars;
+
+static int poll_wait_key(char *obuf, struct uart_cpm_port *pinfo)
+{
+        u_char          c, *cp;
+        volatile cbd_t  *bdp;
+        int             i;
+
+        /* Get the address of the host memory buffer.
+         */
+        bdp = pinfo->rx_cur;
+        while (bdp->cbd_sc & BD_SC_EMPTY)
+                ;
+
+        /* If the buffer address is in the CPM DPRAM, don't
+         * convert it.
+         */
+        cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
+
+        if (obuf) {
+                i = c = bdp->cbd_datlen;
+                while (i-- > 0)
+                        *obuf++ = *cp++;
+        } else
+                c = *cp;
+        bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID);
+        bdp->cbd_sc |= BD_SC_EMPTY;
+
+        if (bdp->cbd_sc & BD_SC_WRAP)
+                bdp = pinfo->rx_bd_base;
+        else
+                bdp++;
+        pinfo->rx_cur = (cbd_t *)bdp;
+
+        return (int)c;
+}
+
+static int cpm_get_poll_char(struct uart_port *port)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+
+        if (!serial_polled) {
+                serial_polled = 1;
+                poll_chars = 0;
+        }
+        if (poll_chars <= 0) {
+                poll_chars = poll_wait_key(poll_buf, pinfo);
+                pollp = poll_buf;
+        }
+        poll_chars--;
+        return *pollp++;
+}
+
+static void cpm_put_poll_char(struct uart_port *port,
+                         unsigned char c)
+{
+        struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port;
+        static char ch[2];
+
+        ch[0] = (char)c;
+        cpm_uart_early_write(pinfo, ch, 1);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
+static struct uart_ops cpm_uart_pops = {
+        .tx_empty       = cpm_uart_tx_empty,
+        .set_mctrl      = cpm_uart_set_mctrl,
+        .get_mctrl      = cpm_uart_get_mctrl,
+        .stop_tx        = cpm_uart_stop_tx,
+        .start_tx       = cpm_uart_start_tx,
+        .stop_rx        = cpm_uart_stop_rx,
+        .enable_ms      = cpm_uart_enable_ms,
+        .break_ctl      = cpm_uart_break_ctl,
+        .startup        = cpm_uart_startup,
+        .shutdown       = cpm_uart_shutdown,
+        .set_termios    = cpm_uart_set_termios,
+        .type           = cpm_uart_type,
+        .release_port   = cpm_uart_release_port,
+        .request_port   = cpm_uart_request_port,
+        .config_port    = cpm_uart_config_port,
+        .verify_port    = cpm_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char = cpm_get_poll_char,
+        .poll_put_char = cpm_put_poll_char,
+#endif
+};
+
+struct uart_cpm_port cpm_uart_ports[UART_NR];
+
+static int cpm_uart_init_port(struct device_node *np,
+                              struct uart_cpm_port *pinfo)
+{
+        const u32 *data;
+        void __iomem *mem, *pram;
+        int len;
+        int ret;
+        int i;
+
+        data = of_get_property(np, "clock", NULL);
+        if (data) {
+                struct clk *clk = clk_get(NULL, (const char*)data);
+                if (!IS_ERR(clk))
+                        pinfo->clk = clk;
+        }
+        if (!pinfo->clk) {
+                data = of_get_property(np, "fsl,cpm-brg", &len);
+                if (!data || len != 4) {
+                        printk(KERN_ERR "CPM UART %s has no/invalid "
+                                        "fsl,cpm-brg property.\n", np->name);
+                        return -EINVAL;
+                }
+                pinfo->brg = *data;
+        }
+
+        data = of_get_property(np, "fsl,cpm-command", &len);
+        if (!data || len != 4) {
+                printk(KERN_ERR "CPM UART %s has no/invalid "
+                                "fsl,cpm-command property.\n", np->name);
+                return -EINVAL;
+        }
+        pinfo->command = *data;
+
+        mem = of_iomap(np, 0);
+        if (!mem)
+                return -ENOMEM;
+
+        if (of_device_is_compatible(np, "fsl,cpm1-scc-uart") ||
+            of_device_is_compatible(np, "fsl,cpm2-scc-uart")) {
+                pinfo->sccp = mem;
+                pinfo->sccup = pram = cpm_uart_map_pram(pinfo, np);
+        } else if (of_device_is_compatible(np, "fsl,cpm1-smc-uart") ||
+                   of_device_is_compatible(np, "fsl,cpm2-smc-uart")) {
+                pinfo->flags |= FLAG_SMC;
+                pinfo->smcp = mem;
+                pinfo->smcup = pram = cpm_uart_map_pram(pinfo, np);
+        } else {
+                ret = -ENODEV;
+                goto out_mem;
+        }
+
+        if (!pram) {
+                ret = -ENOMEM;
+                goto out_mem;
+        }
+
+        pinfo->tx_nrfifos = TX_NUM_FIFO;
+        pinfo->tx_fifosize = TX_BUF_SIZE;
+        pinfo->rx_nrfifos = RX_NUM_FIFO;
+        pinfo->rx_fifosize = RX_BUF_SIZE;
+
+        pinfo->port.uartclk = ppc_proc_freq;
+        pinfo->port.mapbase = (unsigned long)mem;
+        pinfo->port.type = PORT_CPM;
+        pinfo->port.ops = &cpm_uart_pops,
+        pinfo->port.iotype = UPIO_MEM;
+        pinfo->port.fifosize = pinfo->tx_nrfifos * pinfo->tx_fifosize;
+        spin_lock_init(&pinfo->port.lock);
+
+        pinfo->port.irq = of_irq_to_resource(np, 0, NULL);
+        if (pinfo->port.irq == NO_IRQ) {
+                ret = -EINVAL;
+                goto out_pram;
+        }
+
+        for (i = 0; i < NUM_GPIOS; i++)
+                pinfo->gpios[i] = of_get_gpio(np, i);
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+        udbg_putc = NULL;
+#endif
+
+        return cpm_uart_request_port(&pinfo->port);
+
+out_pram:
+        cpm_uart_unmap_pram(pinfo, pram);
+out_mem:
+        iounmap(mem);
+        return ret;
+}
+
+#ifdef CONFIG_SERIAL_CPM_CONSOLE
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ *
+ *      Note that this is called with interrupts already disabled
+ */
+static void cpm_uart_console_write(struct console *co, const char *s,
+                                   u_int count)
+{
+        struct uart_cpm_port *pinfo = &cpm_uart_ports[co->index];
+        unsigned long flags;
+        int nolock = oops_in_progress;
+
+        if (unlikely(nolock)) {
+                local_irq_save(flags);
+        } else {
+                spin_lock_irqsave(&pinfo->port.lock, flags);
+        }
+
+        cpm_uart_early_write(pinfo, s, count);
+
+        if (unlikely(nolock)) {
+                local_irq_restore(flags);
+        } else {
+                spin_unlock_irqrestore(&pinfo->port.lock, flags);
+        }
+}
+
+
+static int __init cpm_uart_console_setup(struct console *co, char *options)
+{
+        int baud = 38400;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+        struct uart_cpm_port *pinfo;
+        struct uart_port *port;
+
+        struct device_node *np = NULL;
+        int i = 0;
+
+        if (co->index >= UART_NR) {
+                printk(KERN_ERR "cpm_uart: console index %d too high\n",
+                       co->index);
+                return -ENODEV;
+        }
+
+        do {
+                np = of_find_node_by_type(np, "serial");
+                if (!np)
+                        return -ENODEV;
+
+                if (!of_device_is_compatible(np, "fsl,cpm1-smc-uart") &&
+                    !of_device_is_compatible(np, "fsl,cpm1-scc-uart") &&
+                    !of_device_is_compatible(np, "fsl,cpm2-smc-uart") &&
+                    !of_device_is_compatible(np, "fsl,cpm2-scc-uart"))
+                        i--;
+        } while (i++ != co->index);
+
+        pinfo = &cpm_uart_ports[co->index];
+
+        pinfo->flags |= FLAG_CONSOLE;
+        port = &pinfo->port;
+
+        ret = cpm_uart_init_port(np, pinfo);
+        of_node_put(np);
+        if (ret)
+                return ret;
+
+        if (options) {
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        } else {
+                if ((baud = uart_baudrate()) == -1)
+                        baud = 9600;
+        }
+
+        if (IS_SMC(pinfo)) {
+                out_be16(&pinfo->smcup->smc_brkcr, 0);
+                cpm_line_cr_cmd(pinfo, CPM_CR_STOP_TX);
+                clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX | SMCM_TX);
+                clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN | SMCMR_TEN);
+        } else {
+                out_be16(&pinfo->sccup->scc_brkcr, 0);
+                cpm_line_cr_cmd(pinfo, CPM_CR_GRA_STOP_TX);
+                clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_TX | UART_SCCM_RX);
+                clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+        }
+
+        ret = cpm_uart_allocbuf(pinfo, 1);
+
+        if (ret)
+                return ret;
+
+        cpm_uart_initbd(pinfo);
+
+        if (IS_SMC(pinfo))
+                cpm_uart_init_smc(pinfo);
+        else
+                cpm_uart_init_scc(pinfo);
+
+        uart_set_options(port, co, baud, parity, bits, flow);
+        cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
+
+        return 0;
+}
+
+static struct uart_driver cpm_reg;
+static struct console cpm_scc_uart_console = {
+        .name           = "ttyCPM",
+        .write          = cpm_uart_console_write,
+        .device         = uart_console_device,
+        .setup          = cpm_uart_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &cpm_reg,
+};
+
+static int __init cpm_uart_console_init(void)
+{
+        register_console(&cpm_scc_uart_console);
+        return 0;
+}
+
+console_initcall(cpm_uart_console_init);
+
+#define CPM_UART_CONSOLE        &cpm_scc_uart_console
+#else
+#define CPM_UART_CONSOLE        NULL
+#endif
+
+static struct uart_driver cpm_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "ttyCPM",
+        .dev_name       = "ttyCPM",
+        .major          = SERIAL_CPM_MAJOR,
+        .minor          = SERIAL_CPM_MINOR,
+        .cons           = CPM_UART_CONSOLE,
+        .nr             = UART_NR,
+};
+
+static int probe_index;
+
+static int __devinit cpm_uart_probe(struct platform_device *ofdev)
+{
+        int index = probe_index++;
+        struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
+        int ret;
+
+        pinfo->port.line = index;
+
+        if (index >= UART_NR)
+                return -ENODEV;
+
+        dev_set_drvdata(&ofdev->dev, pinfo);
+
+        /* initialize the device pointer for the port */
+        pinfo->port.dev = &ofdev->dev;
+
+        ret = cpm_uart_init_port(ofdev->dev.of_node, pinfo);
+        if (ret)
+                return ret;
+
+        return uart_add_one_port(&cpm_reg, &pinfo->port);
+}
+
+static int __devexit cpm_uart_remove(struct platform_device *ofdev)
+{
+        struct uart_cpm_port *pinfo = dev_get_drvdata(&ofdev->dev);
+        return uart_remove_one_port(&cpm_reg, &pinfo->port);
+}
+
+static struct of_device_id cpm_uart_match[] = {
+        {
+                .compatible = "fsl,cpm1-smc-uart",
+        },
+        {
+                .compatible = "fsl,cpm1-scc-uart",
+        },
+        {
+                .compatible = "fsl,cpm2-smc-uart",
+        },
+        {
+                .compatible = "fsl,cpm2-scc-uart",
+        },
+        {}
+};
+
+static struct platform_driver cpm_uart_driver = {
+        .driver = {
+                .name = "cpm_uart",
+                .owner = THIS_MODULE,
+                .of_match_table = cpm_uart_match,
+        },
+        .probe = cpm_uart_probe,
+        .remove = cpm_uart_remove,
+ };
+
+static int __init cpm_uart_init(void)
+{
+        int ret = uart_register_driver(&cpm_reg);
+        if (ret)
+                return ret;
+
+        ret = platform_driver_register(&cpm_uart_driver);
+        if (ret)
+                uart_unregister_driver(&cpm_reg);
+
+        return ret;
+}
+
+static void __exit cpm_uart_exit(void)
+{
+        platform_driver_unregister(&cpm_uart_driver);
+        uart_unregister_driver(&cpm_reg);
+}
+
+module_init(cpm_uart_init);
+module_exit(cpm_uart_exit);
+
+MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis");
+MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR);
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
new file mode 100644
index 000000000000..18f79575894a
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.c
@@ -0,0 +1,136 @@
+/*
+ *  Driver for CPM (SCC/SMC) serial ports; CPM1 definitions
+ *
+ *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
+ *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
+ *
+ *  Copyright (C) 2004 Freescale Semiconductor, Inc.
+ *            (C) 2004 Intracom, S.A.
+ *            (C) 2006 MontaVista Software, Inc.
+ *              Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/gfp.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/bootmem.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/fs_pd.h>
+
+#include <linux/serial_core.h>
+#include <linux/kernel.h>
+
+#include <linux/of.h>
+
+#include "cpm_uart.h"
+
+/**************************************************************/
+
+void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
+{
+        cpm_command(port->command, cmd);
+}
+
+void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
+                                struct device_node *np)
+{
+        return of_iomap(np, 1);
+}
+
+void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
+{
+        iounmap(pram);
+}
+
+/*
+ * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
+ * receive buffer descriptors from dual port ram, and a character
+ * buffer area from host mem. If we are allocating for the console we need
+ * to do it from bootmem
+ */
+int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
+{
+        int dpmemsz, memsz;
+        u8 *dp_mem;
+        unsigned long dp_offset;
+        u8 *mem_addr;
+        dma_addr_t dma_addr = 0;
+
+        pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
+
+        dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
+        dp_offset = cpm_dpalloc(dpmemsz, 8);
+        if (IS_ERR_VALUE(dp_offset)) {
+                printk(KERN_ERR
+                       "cpm_uart_cpm1.c: could not allocate buffer descriptors\n");
+                return -ENOMEM;
+        }
+        dp_mem = cpm_dpram_addr(dp_offset);
+
+        memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
+            L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
+        if (is_con) {
+                /* was hostalloc but changed cause it blows away the */
+                /* large tlb mapping when pinning the kernel area    */
+                mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
+                dma_addr = (u32)cpm_dpram_phys(mem_addr);
+        } else
+                mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
+                                              GFP_KERNEL);
+
+        if (mem_addr == NULL) {
+                cpm_dpfree(dp_offset);
+                printk(KERN_ERR
+                       "cpm_uart_cpm1.c: could not allocate coherent memory\n");
+                return -ENOMEM;
+        }
+
+        pinfo->dp_addr = dp_offset;
+        pinfo->mem_addr = mem_addr;             /*  virtual address*/
+        pinfo->dma_addr = dma_addr;             /*  physical address*/
+        pinfo->mem_size = memsz;
+
+        pinfo->rx_buf = mem_addr;
+        pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
+                                                       * pinfo->rx_fifosize);
+
+        pinfo->rx_bd_base = (cbd_t __iomem __force *)dp_mem;
+        pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
+
+        return 0;
+}
+
+void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
+{
+        dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
+                                                          pinfo->rx_fifosize) +
+                          L1_CACHE_ALIGN(pinfo->tx_nrfifos *
+                                         pinfo->tx_fifosize), pinfo->mem_addr,
+                          pinfo->dma_addr);
+
+        cpm_dpfree(pinfo->dp_addr);
+}
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.h b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.h
new file mode 100644
index 000000000000..60c7e94cde1e
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm1.h
@@ -0,0 +1,32 @@
+/*
+ * Driver for CPM (SCC/SMC) serial ports
+ *
+ * definitions for cpm1
+ *
+ */
+
+#ifndef CPM_UART_CPM1_H
+#define CPM_UART_CPM1_H
+
+#include <asm/cpm1.h>
+
+static inline void cpm_set_brg(int brg, int baud)
+{
+        cpm_setbrg(brg, baud);
+}
+
+static inline void cpm_set_scc_fcr(scc_uart_t __iomem * sup)
+{
+        out_8(&sup->scc_genscc.scc_rfcr, SMC_EB);
+        out_8(&sup->scc_genscc.scc_tfcr, SMC_EB);
+}
+
+static inline void cpm_set_smc_fcr(smc_uart_t __iomem * up)
+{
+        out_8(&up->smc_rfcr, SMC_EB);
+        out_8(&up->smc_tfcr, SMC_EB);
+}
+
+#define DPRAM_BASE      ((u8 __iomem __force *)cpm_dpram_addr(0))
+
+#endif
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
new file mode 100644
index 000000000000..a4927e66e741
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.c
@@ -0,0 +1,172 @@
+/*
+ *  Driver for CPM (SCC/SMC) serial ports; CPM2 definitions
+ *
+ *  Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2)
+ *              Pantelis Antoniou (panto@intracom.gr) (CPM1)
+ *
+ *  Copyright (C) 2004 Freescale Semiconductor, Inc.
+ *            (C) 2004 Intracom, S.A.
+ *            (C) 2006 MontaVista Software, Inc.
+ *              Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/bootmem.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/fs_pd.h>
+#include <asm/prom.h>
+
+#include <linux/serial_core.h>
+#include <linux/kernel.h>
+
+#include "cpm_uart.h"
+
+/**************************************************************/
+
+void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd)
+{
+        cpm_command(port->command, cmd);
+}
+
+void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
+                                struct device_node *np)
+{
+        void __iomem *pram;
+        unsigned long offset;
+        struct resource res;
+        resource_size_t len;
+
+        /* Don't remap parameter RAM if it has already been initialized
+         * during console setup.
+         */
+        if (IS_SMC(port) && port->smcup)
+                return port->smcup;
+        else if (!IS_SMC(port) && port->sccup)
+                return port->sccup;
+
+        if (of_address_to_resource(np, 1, &res))
+                return NULL;
+
+        len = resource_size(&res);
+        pram = ioremap(res.start, len);
+        if (!pram)
+                return NULL;
+
+        if (!IS_SMC(port))
+                return pram;
+
+        if (len != 2) {
+                printk(KERN_WARNING "cpm_uart[%d]: device tree references "
+                        "SMC pram, using boot loader/wrapper pram mapping. "
+                        "Please fix your device tree to reference the pram "
+                        "base register instead.\n",
+                        port->port.line);
+                return pram;
+        }
+
+        offset = cpm_dpalloc(PROFF_SMC_SIZE, 64);
+        out_be16(pram, offset);
+        iounmap(pram);
+        return cpm_muram_addr(offset);
+}
+
+void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram)
+{
+        if (!IS_SMC(port))
+                iounmap(pram);
+}
+
+/*
+ * Allocate DP-Ram and memory buffers. We need to allocate a transmit and
+ * receive buffer descriptors from dual port ram, and a character
+ * buffer area from host mem. If we are allocating for the console we need
+ * to do it from bootmem
+ */
+int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
+{
+        int dpmemsz, memsz;
+        u8 __iomem *dp_mem;
+        unsigned long dp_offset;
+        u8 *mem_addr;
+        dma_addr_t dma_addr = 0;
+
+        pr_debug("CPM uart[%d]:allocbuf\n", pinfo->port.line);
+
+        dpmemsz = sizeof(cbd_t) * (pinfo->rx_nrfifos + pinfo->tx_nrfifos);
+        dp_offset = cpm_dpalloc(dpmemsz, 8);
+        if (IS_ERR_VALUE(dp_offset)) {
+                printk(KERN_ERR
+                       "cpm_uart_cpm.c: could not allocate buffer descriptors\n");
+                return -ENOMEM;
+        }
+
+        dp_mem = cpm_dpram_addr(dp_offset);
+
+        memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
+            L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
+        if (is_con) {
+                mem_addr = kzalloc(memsz, GFP_NOWAIT);
+                dma_addr = virt_to_bus(mem_addr);
+        }
+        else
+                mem_addr = dma_alloc_coherent(pinfo->port.dev, memsz, &dma_addr,
+                                              GFP_KERNEL);
+
+        if (mem_addr == NULL) {
+                cpm_dpfree(dp_offset);
+                printk(KERN_ERR
+                       "cpm_uart_cpm.c: could not allocate coherent memory\n");
+                return -ENOMEM;
+        }
+
+        pinfo->dp_addr = dp_offset;
+        pinfo->mem_addr = mem_addr;
+        pinfo->dma_addr = dma_addr;
+        pinfo->mem_size = memsz;
+
+        pinfo->rx_buf = mem_addr;
+        pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
+                                                       * pinfo->rx_fifosize);
+
+        pinfo->rx_bd_base = (cbd_t __iomem *)dp_mem;
+        pinfo->tx_bd_base = pinfo->rx_bd_base + pinfo->rx_nrfifos;
+
+        return 0;
+}
+
+void cpm_uart_freebuf(struct uart_cpm_port *pinfo)
+{
+        dma_free_coherent(pinfo->port.dev, L1_CACHE_ALIGN(pinfo->rx_nrfifos *
+                                                          pinfo->rx_fifosize) +
+                          L1_CACHE_ALIGN(pinfo->tx_nrfifos *
+                                         pinfo->tx_fifosize), (void __force *)pinfo->mem_addr,
+                          pinfo->dma_addr);
+
+        cpm_dpfree(pinfo->dp_addr);
+}
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.h b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.h
new file mode 100644
index 000000000000..51e651a69938
--- /dev/null
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_cpm2.h
@@ -0,0 +1,32 @@
+/*
+ * Driver for CPM (SCC/SMC) serial ports
+ *
+ * definitions for cpm2
+ *
+ */
+
+#ifndef CPM_UART_CPM2_H
+#define CPM_UART_CPM2_H
+
+#include <asm/cpm2.h>
+
+static inline void cpm_set_brg(int brg, int baud)
+{
+        cpm_setbrg(brg, baud);
+}
+
+static inline void cpm_set_scc_fcr(scc_uart_t __iomem *sup)
+{
+        out_8(&sup->scc_genscc.scc_rfcr, CPMFCR_GBL | CPMFCR_EB);
+        out_8(&sup->scc_genscc.scc_tfcr, CPMFCR_GBL | CPMFCR_EB);
+}
+
+static inline void cpm_set_smc_fcr(smc_uart_t __iomem *up)
+{
+        out_8(&up->smc_rfcr, CPMFCR_GBL | CPMFCR_EB);
+        out_8(&up->smc_tfcr, CPMFCR_GBL | CPMFCR_EB);
+}
+
+#define DPRAM_BASE      ((u8 __iomem __force *)cpm_dpram_addr(0))
+
+#endif
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
new file mode 100644
index 000000000000..225123b37f19
--- /dev/null
+++ b/drivers/tty/serial/crisv10.c
@@ -0,0 +1,4572 @@
+/*
+ * Serial port driver for the ETRAX 100LX chip
+ *
+ *    Copyright (C) 1998-2007  Axis Communications AB
+ *
+ *    Many, many authors. Based once upon a time on serial.c for 16x50.
+ *
+ */
+
+static char *serial_version = "$Revision: 1.25 $";
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/bitops.h>
+#include <linux/seq_file.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+#include <asm/dma.h>
+#include <asm/system.h>
+
+#include <arch/svinto.h>
+
+/* non-arch dependent serial structures are in linux/serial.h */
+#include <linux/serial.h>
+/* while we keep our own stuff (struct e100_serial) in a local .h file */
+#include "crisv10.h"
+#include <asm/fasttimer.h>
+#include <arch/io_interface_mux.h>
+
+#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
+#ifndef CONFIG_ETRAX_FAST_TIMER
+#error "Enable FAST_TIMER to use SERIAL_FAST_TIMER"
+#endif
+#endif
+
+#if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \
+           (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0)
+#error "RX_TIMEOUT_TICKS == 0 not allowed, use 1"
+#endif
+
+#if defined(CONFIG_ETRAX_RS485_ON_PA) && defined(CONFIG_ETRAX_RS485_ON_PORT_G)
+#error "Disable either CONFIG_ETRAX_RS485_ON_PA or CONFIG_ETRAX_RS485_ON_PORT_G"
+#endif
+
+/*
+ * All of the compatibilty code so we can compile serial.c against
+ * older kernels is hidden in serial_compat.h
+ */
+#if defined(LOCAL_HEADERS)
+#include "serial_compat.h"
+#endif
+
+struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+//#define SERIAL_DEBUG_INTR
+//#define SERIAL_DEBUG_OPEN
+//#define SERIAL_DEBUG_FLOW
+//#define SERIAL_DEBUG_DATA
+//#define SERIAL_DEBUG_THROTTLE
+//#define SERIAL_DEBUG_IO  /* Debug for Extra control and status pins */
+//#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */
+
+/* Enable this to use serial interrupts to handle when you
+   expect the first received event on the serial port to
+   be an error, break or similar. Used to be able to flash IRMA
+   from eLinux */
+#define SERIAL_HANDLE_EARLY_ERRORS
+
+/* Currently 16 descriptors x 128 bytes = 2048 bytes */
+#define SERIAL_DESCR_BUF_SIZE 256
+
+#define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */
+#define DEF_BAUD_BASE SERIAL_PRESCALE_BASE
+
+/* We don't want to load the system with massive fast timer interrupt
+ * on high baudrates so limit it to 250 us (4kHz) */
+#define MIN_FLUSH_TIME_USEC 250
+
+/* Add an x here to log a lot of timer stuff */
+#define TIMERD(x)
+/* Debug details of interrupt handling */
+#define DINTR1(x)  /* irq on/off, errors */
+#define DINTR2(x)    /* tx and rx */
+/* Debug flip buffer stuff */
+#define DFLIP(x)
+/* Debug flow control and overview of data flow */
+#define DFLOW(x)
+#define DBAUD(x)
+#define DLOG_INT_TRIG(x)
+
+//#define DEBUG_LOG_INCLUDED
+#ifndef DEBUG_LOG_INCLUDED
+#define DEBUG_LOG(line, string, value)
+#else
+struct debug_log_info
+{
+        unsigned long time;
+        unsigned long timer_data;
+//  int line;
+        const char *string;
+        int value;
+};
+#define DEBUG_LOG_SIZE 4096
+
+struct debug_log_info debug_log[DEBUG_LOG_SIZE];
+int debug_log_pos = 0;
+
+#define DEBUG_LOG(_line, _string, _value) do { \
+  if ((_line) == SERIAL_DEBUG_LINE) {\
+    debug_log_func(_line, _string, _value); \
+  }\
+}while(0)
+
+void debug_log_func(int line, const char *string, int value)
+{
+        if (debug_log_pos < DEBUG_LOG_SIZE) {
+                debug_log[debug_log_pos].time = jiffies;
+                debug_log[debug_log_pos].timer_data = *R_TIMER_DATA;
+//    debug_log[debug_log_pos].line = line;
+                debug_log[debug_log_pos].string = string;
+                debug_log[debug_log_pos].value = value;
+                debug_log_pos++;
+        }
+        /*printk(string, value);*/
+}
+#endif
+
+#ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS
+/* Default number of timer ticks before flushing rx fifo
+ * When using "little data, low latency applications: use 0
+ * When using "much data applications (PPP)" use ~5
+ */
+#define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5
+#endif
+
+unsigned long timer_data_to_ns(unsigned long timer_data);
+
+static void change_speed(struct e100_serial *info);
+static void rs_throttle(struct tty_struct * tty);
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
+static int rs_write(struct tty_struct *tty,
+                const unsigned char *buf, int count);
+#ifdef CONFIG_ETRAX_RS485
+static int e100_write_rs485(struct tty_struct *tty,
+                const unsigned char *buf, int count);
+#endif
+static int get_lsr_info(struct e100_serial *info, unsigned int *value);
+
+
+#define DEF_BAUD 115200   /* 115.2 kbit/s */
+#define STD_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
+#define DEF_RX 0x20  /* or SERIAL_CTRL_W >> 8 */
+/* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */
+#define DEF_TX 0x80  /* or SERIAL_CTRL_B */
+
+/* offsets from R_SERIALx_CTRL */
+
+#define REG_DATA 0
+#define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */
+#define REG_TR_DATA 0
+#define REG_STATUS 1
+#define REG_TR_CTRL 1
+#define REG_REC_CTRL 2
+#define REG_BAUD 3
+#define REG_XOFF 4  /* this is a 32 bit register */
+
+/* The bitfields are the same for all serial ports */
+#define SER_RXD_MASK         IO_MASK(R_SERIAL0_STATUS, rxd)
+#define SER_DATA_AVAIL_MASK  IO_MASK(R_SERIAL0_STATUS, data_avail)
+#define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err)
+#define SER_PAR_ERR_MASK     IO_MASK(R_SERIAL0_STATUS, par_err)
+#define SER_OVERRUN_MASK     IO_MASK(R_SERIAL0_STATUS, overrun)
+
+#define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK)
+
+/* Values for info->errorcode */
+#define ERRCODE_SET_BREAK    (TTY_BREAK)
+#define ERRCODE_INSERT        0x100
+#define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK)
+
+#define FORCE_EOP(info)  *R_SET_EOP = 1U << info->iseteop;
+
+/*
+ * General note regarding the use of IO_* macros in this file:
+ *
+ * We will use the bits defined for DMA channel 6 when using various
+ * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are
+ * the same for all channels (which of course they are).
+ *
+ * We will also use the bits defined for serial port 0 when writing commands
+ * to the different ports, as these bits too are the same for all ports.
+ */
+
+
+/* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */
+static const unsigned long e100_ser_int_mask = 0
+#ifdef CONFIG_ETRAX_SERIAL_PORT0
+| IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready)
+#endif
+#ifdef CONFIG_ETRAX_SERIAL_PORT1
+| IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready)
+#endif
+#ifdef CONFIG_ETRAX_SERIAL_PORT2
+| IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready)
+#endif
+#ifdef CONFIG_ETRAX_SERIAL_PORT3
+| IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready)
+#endif
+;
+unsigned long r_alt_ser_baudrate_shadow = 0;
+
+/* this is the data for the four serial ports in the etrax100 */
+/*  DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */
+/* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */
+
+static struct e100_serial rs_table[] = {
+        { .baud        = DEF_BAUD,
+          .ioport        = (unsigned char *)R_SERIAL0_CTRL,
+          .irq         = 1U << 12, /* uses DMA 6 and 7 */
+          .oclrintradr = R_DMA_CH6_CLR_INTR,
+          .ofirstadr   = R_DMA_CH6_FIRST,
+          .ocmdadr     = R_DMA_CH6_CMD,
+          .ostatusadr  = R_DMA_CH6_STATUS,
+          .iclrintradr = R_DMA_CH7_CLR_INTR,
+          .ifirstadr   = R_DMA_CH7_FIRST,
+          .icmdadr     = R_DMA_CH7_CMD,
+          .idescradr   = R_DMA_CH7_DESCR,
+          .flags       = STD_FLAGS,
+          .rx_ctrl     = DEF_RX,
+          .tx_ctrl     = DEF_TX,
+          .iseteop     = 2,
+          .dma_owner   = dma_ser0,
+          .io_if       = if_serial_0,
+#ifdef CONFIG_ETRAX_SERIAL_PORT0
+          .enabled  = 1,
+#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT
+          .dma_out_enabled = 1,
+          .dma_out_nbr = SER0_TX_DMA_NBR,
+          .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR,
+          .dma_out_irq_flags = IRQF_DISABLED,
+          .dma_out_irq_description = "serial 0 dma tr",
+#else
+          .dma_out_enabled = 0,
+          .dma_out_nbr = UINT_MAX,
+          .dma_out_irq_nbr = 0,
+          .dma_out_irq_flags = 0,
+          .dma_out_irq_description = NULL,
+#endif
+#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN
+          .dma_in_enabled = 1,
+          .dma_in_nbr = SER0_RX_DMA_NBR,
+          .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR,
+          .dma_in_irq_flags = IRQF_DISABLED,
+          .dma_in_irq_description = "serial 0 dma rec",
+#else
+          .dma_in_enabled = 0,
+          .dma_in_nbr = UINT_MAX,
+          .dma_in_irq_nbr = 0,
+          .dma_in_irq_flags = 0,
+          .dma_in_irq_description = NULL,
+#endif
+#else
+          .enabled  = 0,
+          .io_if_description = NULL,
+          .dma_out_enabled = 0,
+          .dma_in_enabled = 0
+#endif
+
+},  /* ttyS0 */
+#ifndef CONFIG_SVINTO_SIM
+        { .baud        = DEF_BAUD,
+          .ioport        = (unsigned char *)R_SERIAL1_CTRL,
+          .irq         = 1U << 16, /* uses DMA 8 and 9 */
+          .oclrintradr = R_DMA_CH8_CLR_INTR,
+          .ofirstadr   = R_DMA_CH8_FIRST,
+          .ocmdadr     = R_DMA_CH8_CMD,
+          .ostatusadr  = R_DMA_CH8_STATUS,
+          .iclrintradr = R_DMA_CH9_CLR_INTR,
+          .ifirstadr   = R_DMA_CH9_FIRST,
+          .icmdadr     = R_DMA_CH9_CMD,
+          .idescradr   = R_DMA_CH9_DESCR,
+          .flags       = STD_FLAGS,
+          .rx_ctrl     = DEF_RX,
+          .tx_ctrl     = DEF_TX,
+          .iseteop     = 3,
+          .dma_owner   = dma_ser1,
+          .io_if       = if_serial_1,
+#ifdef CONFIG_ETRAX_SERIAL_PORT1
+          .enabled  = 1,
+          .io_if_description = "ser1",
+#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT
+          .dma_out_enabled = 1,
+          .dma_out_nbr = SER1_TX_DMA_NBR,
+          .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR,
+          .dma_out_irq_flags = IRQF_DISABLED,
+          .dma_out_irq_description = "serial 1 dma tr",
+#else
+          .dma_out_enabled = 0,
+          .dma_out_nbr = UINT_MAX,
+          .dma_out_irq_nbr = 0,
+          .dma_out_irq_flags = 0,
+          .dma_out_irq_description = NULL,
+#endif
+#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN
+          .dma_in_enabled = 1,
+          .dma_in_nbr = SER1_RX_DMA_NBR,
+          .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR,
+          .dma_in_irq_flags = IRQF_DISABLED,
+          .dma_in_irq_description = "serial 1 dma rec",
+#else
+          .dma_in_enabled = 0,
+          .dma_in_enabled = 0,
+          .dma_in_nbr = UINT_MAX,
+          .dma_in_irq_nbr = 0,
+          .dma_in_irq_flags = 0,
+          .dma_in_irq_description = NULL,
+#endif
+#else
+          .enabled  = 0,
+          .io_if_description = NULL,
+          .dma_in_irq_nbr = 0,
+          .dma_out_enabled = 0,
+          .dma_in_enabled = 0
+#endif
+},  /* ttyS1 */
+
+        { .baud        = DEF_BAUD,
+          .ioport        = (unsigned char *)R_SERIAL2_CTRL,
+          .irq         = 1U << 4,  /* uses DMA 2 and 3 */
+          .oclrintradr = R_DMA_CH2_CLR_INTR,
+          .ofirstadr   = R_DMA_CH2_FIRST,
+          .ocmdadr     = R_DMA_CH2_CMD,
+          .ostatusadr  = R_DMA_CH2_STATUS,
+          .iclrintradr = R_DMA_CH3_CLR_INTR,
+          .ifirstadr   = R_DMA_CH3_FIRST,
+          .icmdadr     = R_DMA_CH3_CMD,
+          .idescradr   = R_DMA_CH3_DESCR,
+          .flags       = STD_FLAGS,
+          .rx_ctrl     = DEF_RX,
+          .tx_ctrl     = DEF_TX,
+          .iseteop     = 0,
+          .dma_owner   = dma_ser2,
+          .io_if       = if_serial_2,
+#ifdef CONFIG_ETRAX_SERIAL_PORT2
+          .enabled  = 1,
+          .io_if_description = "ser2",
+#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT
+          .dma_out_enabled = 1,
+          .dma_out_nbr = SER2_TX_DMA_NBR,
+          .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR,
+          .dma_out_irq_flags = IRQF_DISABLED,
+          .dma_out_irq_description = "serial 2 dma tr",
+#else
+          .dma_out_enabled = 0,
+          .dma_out_nbr = UINT_MAX,
+          .dma_out_irq_nbr = 0,
+          .dma_out_irq_flags = 0,
+          .dma_out_irq_description = NULL,
+#endif
+#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN
+          .dma_in_enabled = 1,
+          .dma_in_nbr = SER2_RX_DMA_NBR,
+          .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR,
+          .dma_in_irq_flags = IRQF_DISABLED,
+          .dma_in_irq_description = "serial 2 dma rec",
+#else
+          .dma_in_enabled = 0,
+          .dma_in_nbr = UINT_MAX,
+          .dma_in_irq_nbr = 0,
+          .dma_in_irq_flags = 0,
+          .dma_in_irq_description = NULL,
+#endif
+#else
+          .enabled  = 0,
+          .io_if_description = NULL,
+          .dma_out_enabled = 0,
+          .dma_in_enabled = 0
+#endif
+ },  /* ttyS2 */
+
+        { .baud        = DEF_BAUD,
+          .ioport        = (unsigned char *)R_SERIAL3_CTRL,
+          .irq         = 1U << 8,  /* uses DMA 4 and 5 */
+          .oclrintradr = R_DMA_CH4_CLR_INTR,
+          .ofirstadr   = R_DMA_CH4_FIRST,
+          .ocmdadr     = R_DMA_CH4_CMD,
+          .ostatusadr  = R_DMA_CH4_STATUS,
+          .iclrintradr = R_DMA_CH5_CLR_INTR,
+          .ifirstadr   = R_DMA_CH5_FIRST,
+          .icmdadr     = R_DMA_CH5_CMD,
+          .idescradr   = R_DMA_CH5_DESCR,
+          .flags       = STD_FLAGS,
+          .rx_ctrl     = DEF_RX,
+          .tx_ctrl     = DEF_TX,
+          .iseteop     = 1,
+          .dma_owner   = dma_ser3,
+          .io_if       = if_serial_3,
+#ifdef CONFIG_ETRAX_SERIAL_PORT3
+          .enabled  = 1,
+          .io_if_description = "ser3",
+#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT
+          .dma_out_enabled = 1,
+          .dma_out_nbr = SER3_TX_DMA_NBR,
+          .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR,
+          .dma_out_irq_flags = IRQF_DISABLED,
+          .dma_out_irq_description = "serial 3 dma tr",
+#else
+          .dma_out_enabled = 0,
+          .dma_out_nbr = UINT_MAX,
+          .dma_out_irq_nbr = 0,
+          .dma_out_irq_flags = 0,
+          .dma_out_irq_description = NULL,
+#endif
+#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN
+          .dma_in_enabled = 1,
+          .dma_in_nbr = SER3_RX_DMA_NBR,
+          .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR,
+          .dma_in_irq_flags = IRQF_DISABLED,
+          .dma_in_irq_description = "serial 3 dma rec",
+#else
+          .dma_in_enabled = 0,
+          .dma_in_nbr = UINT_MAX,
+          .dma_in_irq_nbr = 0,
+          .dma_in_irq_flags = 0,
+          .dma_in_irq_description = NULL
+#endif
+#else
+          .enabled  = 0,
+          .io_if_description = NULL,
+          .dma_out_enabled = 0,
+          .dma_in_enabled = 0
+#endif
+ }   /* ttyS3 */
+#endif
+};
+
+
+#define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial))
+
+#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
+static struct fast_timer fast_timers[NR_PORTS];
+#endif
+
+#ifdef CONFIG_ETRAX_SERIAL_PROC_ENTRY
+#define PROCSTAT(x) x
+struct ser_statistics_type {
+        int overrun_cnt;
+        int early_errors_cnt;
+        int ser_ints_ok_cnt;
+        int errors_cnt;
+        unsigned long int processing_flip;
+        unsigned long processing_flip_still_room;
+        unsigned long int timeout_flush_cnt;
+        int rx_dma_ints;
+        int tx_dma_ints;
+        int rx_tot;
+        int tx_tot;
+};
+
+static struct ser_statistics_type ser_stat[NR_PORTS];
+
+#else
+
+#define PROCSTAT(x)
+
+#endif /* CONFIG_ETRAX_SERIAL_PROC_ENTRY */
+
+/* RS-485 */
+#if defined(CONFIG_ETRAX_RS485)
+#ifdef CONFIG_ETRAX_FAST_TIMER
+static struct fast_timer fast_timers_rs485[NR_PORTS];
+#endif
+#if defined(CONFIG_ETRAX_RS485_ON_PA)
+static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT;
+#endif
+#if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
+static int rs485_port_g_bit = CONFIG_ETRAX_RS485_ON_PORT_G_BIT;
+#endif
+#endif
+
+/* Info and macros needed for each ports extra control/status signals. */
+#define E100_STRUCT_PORT(line, pinname) \
+ ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
+                (R_PORT_PA_DATA): ( \
+ (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
+                (R_PORT_PB_DATA):&dummy_ser[line]))
+
+#define E100_STRUCT_SHADOW(line, pinname) \
+ ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
+                (&port_pa_data_shadow): ( \
+ (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
+                (&port_pb_data_shadow):&dummy_ser[line]))
+#define E100_STRUCT_MASK(line, pinname) \
+ ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \
+                (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \
+ (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \
+                (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK))
+
+#define DUMMY_DTR_MASK 1
+#define DUMMY_RI_MASK  2
+#define DUMMY_DSR_MASK 4
+#define DUMMY_CD_MASK  8
+static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF};
+
+/* If not all status pins are used or disabled, use mixed mode */
+#ifdef CONFIG_ETRAX_SERIAL_PORT0
+
+#define SER0_PA_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PA_BIT+CONFIG_ETRAX_SER0_RI_ON_PA_BIT+CONFIG_ETRAX_SER0_DSR_ON_PA_BIT+CONFIG_ETRAX_SER0_CD_ON_PA_BIT)
+
+#if SER0_PA_BITSUM != -4
+#  if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1
+#   ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#define SER0_PB_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PB_BIT+CONFIG_ETRAX_SER0_RI_ON_PB_BIT+CONFIG_ETRAX_SER0_DSR_ON_PB_BIT+CONFIG_ETRAX_SER0_CD_ON_PB_BIT)
+
+#if SER0_PB_BITSUM != -4
+#  if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1
+#   ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#endif /* PORT0 */
+
+
+#ifdef CONFIG_ETRAX_SERIAL_PORT1
+
+#define SER1_PA_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PA_BIT+CONFIG_ETRAX_SER1_RI_ON_PA_BIT+CONFIG_ETRAX_SER1_DSR_ON_PA_BIT+CONFIG_ETRAX_SER1_CD_ON_PA_BIT)
+
+#if SER1_PA_BITSUM != -4
+#  if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1
+#   ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#define SER1_PB_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PB_BIT+CONFIG_ETRAX_SER1_RI_ON_PB_BIT+CONFIG_ETRAX_SER1_DSR_ON_PB_BIT+CONFIG_ETRAX_SER1_CD_ON_PB_BIT)
+
+#if SER1_PB_BITSUM != -4
+#  if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1
+#   ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#endif /* PORT1 */
+
+#ifdef CONFIG_ETRAX_SERIAL_PORT2
+
+#define SER2_PA_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PA_BIT+CONFIG_ETRAX_SER2_RI_ON_PA_BIT+CONFIG_ETRAX_SER2_DSR_ON_PA_BIT+CONFIG_ETRAX_SER2_CD_ON_PA_BIT)
+
+#if SER2_PA_BITSUM != -4
+#  if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1
+#   ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#define SER2_PB_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PB_BIT+CONFIG_ETRAX_SER2_RI_ON_PB_BIT+CONFIG_ETRAX_SER2_DSR_ON_PB_BIT+CONFIG_ETRAX_SER2_CD_ON_PB_BIT)
+
+#if SER2_PB_BITSUM != -4
+#  if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1
+#   ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#endif /* PORT2 */
+
+#ifdef CONFIG_ETRAX_SERIAL_PORT3
+
+#define SER3_PA_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PA_BIT+CONFIG_ETRAX_SER3_RI_ON_PA_BIT+CONFIG_ETRAX_SER3_DSR_ON_PA_BIT+CONFIG_ETRAX_SER3_CD_ON_PA_BIT)
+
+#if SER3_PA_BITSUM != -4
+#  if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1
+#   ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1
+#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#define SER3_PB_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PB_BIT+CONFIG_ETRAX_SER3_RI_ON_PB_BIT+CONFIG_ETRAX_SER3_DSR_ON_PB_BIT+CONFIG_ETRAX_SER3_CD_ON_PB_BIT)
+
+#if SER3_PB_BITSUM != -4
+#  if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#   endif
+# if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1
+#   ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#     define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#   endif
+#  endif
+#  if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#  if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1
+#    ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED
+#      define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1
+#    endif
+#  endif
+#endif
+
+#endif /* PORT3 */
+
+
+#if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \
+    defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \
+    defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \
+    defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED)
+#define CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
+#endif
+
+#ifdef CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED
+/* The pins can be mixed on PA and PB */
+#define CONTROL_PINS_PORT_NOT_USED(line) \
+  &dummy_ser[line], &dummy_ser[line], \
+  &dummy_ser[line], &dummy_ser[line], \
+  &dummy_ser[line], &dummy_ser[line], \
+  &dummy_ser[line], &dummy_ser[line], \
+  DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
+
+
+struct control_pins
+{
+        volatile unsigned char *dtr_port;
+        unsigned char          *dtr_shadow;
+        volatile unsigned char *ri_port;
+        unsigned char          *ri_shadow;
+        volatile unsigned char *dsr_port;
+        unsigned char          *dsr_shadow;
+        volatile unsigned char *cd_port;
+        unsigned char          *cd_shadow;
+
+        unsigned char dtr_mask;
+        unsigned char ri_mask;
+        unsigned char dsr_mask;
+        unsigned char cd_mask;
+};
+
+static const struct control_pins e100_modem_pins[NR_PORTS] =
+{
+        /* Ser 0 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT0
+        E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
+        E100_STRUCT_PORT(0,RI),  E100_STRUCT_SHADOW(0,RI),
+        E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR),
+        E100_STRUCT_PORT(0,CD),  E100_STRUCT_SHADOW(0,CD),
+        E100_STRUCT_MASK(0,DTR),
+        E100_STRUCT_MASK(0,RI),
+        E100_STRUCT_MASK(0,DSR),
+        E100_STRUCT_MASK(0,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(0)
+#endif
+        },
+
+        /* Ser 1 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT1
+        E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
+        E100_STRUCT_PORT(1,RI),  E100_STRUCT_SHADOW(1,RI),
+        E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR),
+        E100_STRUCT_PORT(1,CD),  E100_STRUCT_SHADOW(1,CD),
+        E100_STRUCT_MASK(1,DTR),
+        E100_STRUCT_MASK(1,RI),
+        E100_STRUCT_MASK(1,DSR),
+        E100_STRUCT_MASK(1,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(1)
+#endif
+        },
+
+        /* Ser 2 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT2
+        E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
+        E100_STRUCT_PORT(2,RI),  E100_STRUCT_SHADOW(2,RI),
+        E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR),
+        E100_STRUCT_PORT(2,CD),  E100_STRUCT_SHADOW(2,CD),
+        E100_STRUCT_MASK(2,DTR),
+        E100_STRUCT_MASK(2,RI),
+        E100_STRUCT_MASK(2,DSR),
+        E100_STRUCT_MASK(2,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(2)
+#endif
+        },
+
+        /* Ser 3 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT3
+        E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
+        E100_STRUCT_PORT(3,RI),  E100_STRUCT_SHADOW(3,RI),
+        E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR),
+        E100_STRUCT_PORT(3,CD),  E100_STRUCT_SHADOW(3,CD),
+        E100_STRUCT_MASK(3,DTR),
+        E100_STRUCT_MASK(3,RI),
+        E100_STRUCT_MASK(3,DSR),
+        E100_STRUCT_MASK(3,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(3)
+#endif
+        }
+};
+#else  /* CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
+
+/* All pins are on either PA or PB for each serial port */
+#define CONTROL_PINS_PORT_NOT_USED(line) \
+  &dummy_ser[line], &dummy_ser[line], \
+  DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK
+
+
+struct control_pins
+{
+        volatile unsigned char *port;
+        unsigned char          *shadow;
+
+        unsigned char dtr_mask;
+        unsigned char ri_mask;
+        unsigned char dsr_mask;
+        unsigned char cd_mask;
+};
+
+#define dtr_port port
+#define dtr_shadow shadow
+#define ri_port port
+#define ri_shadow shadow
+#define dsr_port port
+#define dsr_shadow shadow
+#define cd_port port
+#define cd_shadow shadow
+
+static const struct control_pins e100_modem_pins[NR_PORTS] =
+{
+        /* Ser 0 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT0
+        E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR),
+        E100_STRUCT_MASK(0,DTR),
+        E100_STRUCT_MASK(0,RI),
+        E100_STRUCT_MASK(0,DSR),
+        E100_STRUCT_MASK(0,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(0)
+#endif
+        },
+
+        /* Ser 1 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT1
+        E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR),
+        E100_STRUCT_MASK(1,DTR),
+        E100_STRUCT_MASK(1,RI),
+        E100_STRUCT_MASK(1,DSR),
+        E100_STRUCT_MASK(1,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(1)
+#endif
+        },
+
+        /* Ser 2 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT2
+        E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR),
+        E100_STRUCT_MASK(2,DTR),
+        E100_STRUCT_MASK(2,RI),
+        E100_STRUCT_MASK(2,DSR),
+        E100_STRUCT_MASK(2,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(2)
+#endif
+        },
+
+        /* Ser 3 */
+        {
+#ifdef CONFIG_ETRAX_SERIAL_PORT3
+        E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR),
+        E100_STRUCT_MASK(3,DTR),
+        E100_STRUCT_MASK(3,RI),
+        E100_STRUCT_MASK(3,DSR),
+        E100_STRUCT_MASK(3,CD)
+#else
+        CONTROL_PINS_PORT_NOT_USED(3)
+#endif
+        }
+};
+#endif /* !CONFIG_ETRAX_SERX_DTR_RI_DSR_CD_MIXED */
+
+#define E100_RTS_MASK 0x20
+#define E100_CTS_MASK 0x40
+
+/* All serial port signals are active low:
+ * active   = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level
+ * inactive = 1 -> 0V   to RS-232 driver -> +12V on RS-232 level
+ *
+ * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip
+ */
+
+/* Output */
+#define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK)
+/* Input */
+#define E100_CTS_GET(info) ((info)->ioport[REG_STATUS] & E100_CTS_MASK)
+
+/* These are typically PA or PB and 0 means 0V, 1 means 3.3V */
+/* Is an output */
+#define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask)
+
+/* Normally inputs */
+#define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask)
+#define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask)
+
+/* Input */
+#define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask)
+
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write.  We need to
+ * lock it in case the memcpy_fromfs blocks while swapping in a page,
+ * and some other program tries to do a serial write at the same time.
+ * Since the lock will only come under contention when the system is
+ * swapping and available memory is low, it makes sense to share one
+ * buffer across all the serial ports, since it significantly saves
+ * memory if large numbers of serial ports are open.
+ */
+static unsigned char *tmp_buf;
+static DEFINE_MUTEX(tmp_buf_mutex);
+
+/* Calculate the chartime depending on baudrate, numbor of bits etc. */
+static void update_char_time(struct e100_serial * info)
+{
+        tcflag_t cflags = info->port.tty->termios->c_cflag;
+        int bits;
+
+        /* calc. number of bits / data byte */
+        /* databits + startbit and 1 stopbit */
+        if ((cflags & CSIZE) == CS7)
+                bits = 9;
+        else
+                bits = 10;
+
+        if (cflags & CSTOPB)     /* 2 stopbits ? */
+                bits++;
+
+        if (cflags & PARENB)     /* parity bit ? */
+                bits++;
+
+        /* calc timeout */
+        info->char_time_usec = ((bits * 1000000) / info->baud) + 1;
+        info->flush_time_usec = 4*info->char_time_usec;
+        if (info->flush_time_usec < MIN_FLUSH_TIME_USEC)
+                info->flush_time_usec = MIN_FLUSH_TIME_USEC;
+
+}
+
+/*
+ * This function maps from the Bxxxx defines in asm/termbits.h into real
+ * baud rates.
+ */
+
+static int
+cflag_to_baud(unsigned int cflag)
+{
+        static int baud_table[] = {
+                0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
+                4800, 9600, 19200, 38400 };
+
+        static int ext_baud_table[] = {
+                0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000,
+                0, 0, 0, 0, 0, 0, 0, 0 };
+
+        if (cflag & CBAUDEX)
+                return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
+        else
+                return baud_table[cflag & CBAUD];
+}
+
+/* and this maps to an etrax100 hardware baud constant */
+
+static unsigned char
+cflag_to_etrax_baud(unsigned int cflag)
+{
+        char retval;
+
+        static char baud_table[] = {
+                -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 };
+
+        static char ext_baud_table[] = {
+                -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 };
+
+        if (cflag & CBAUDEX)
+                retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX];
+        else
+                retval = baud_table[cflag & CBAUD];
+
+        if (retval < 0) {
+                printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag);
+                retval = 5; /* choose default 9600 instead */
+        }
+
+        return retval | (retval << 4); /* choose same for both TX and RX */
+}
+
+
+/* Various static support functions */
+
+/* Functions to set or clear DTR/RTS on the requested line */
+/* It is complicated by the fact that RTS is a serial port register, while
+ * DTR might not be implemented in the HW at all, and if it is, it can be on
+ * any general port.
+ */
+
+
+static inline void
+e100_dtr(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+        unsigned char mask = e100_modem_pins[info->line].dtr_mask;
+
+#ifdef SERIAL_DEBUG_IO
+        printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask);
+        printk("ser%i shadow before 0x%02X get: %i\n",
+               info->line, *e100_modem_pins[info->line].dtr_shadow,
+               E100_DTR_GET(info));
+#endif
+        /* DTR is active low */
+        {
+                unsigned long flags;
+
+                local_irq_save(flags);
+                *e100_modem_pins[info->line].dtr_shadow &= ~mask;
+                *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask);
+                *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow;
+                local_irq_restore(flags);
+        }
+
+#ifdef SERIAL_DEBUG_IO
+        printk("ser%i shadow after 0x%02X get: %i\n",
+               info->line, *e100_modem_pins[info->line].dtr_shadow,
+               E100_DTR_GET(info));
+#endif
+#endif
+}
+
+/* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive
+ *                                          0=0V    , 1=3.3V
+ */
+static inline void
+e100_rts(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+        unsigned long flags;
+        local_irq_save(flags);
+        info->rx_ctrl &= ~E100_RTS_MASK;
+        info->rx_ctrl |= (set ? 0 : E100_RTS_MASK);  /* RTS is active low */
+        info->ioport[REG_REC_CTRL] = info->rx_ctrl;
+        local_irq_restore(flags);
+#ifdef SERIAL_DEBUG_IO
+        printk("ser%i rts %i\n", info->line, set);
+#endif
+#endif
+}
+
+
+/* If this behaves as a modem, RI and CD is an output */
+static inline void
+e100_ri_out(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+        /* RI is active low */
+        {
+                unsigned char mask = e100_modem_pins[info->line].ri_mask;
+                unsigned long flags;
+
+                local_irq_save(flags);
+                *e100_modem_pins[info->line].ri_shadow &= ~mask;
+                *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask);
+                *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow;
+                local_irq_restore(flags);
+        }
+#endif
+}
+static inline void
+e100_cd_out(struct e100_serial *info, int set)
+{
+#ifndef CONFIG_SVINTO_SIM
+        /* CD is active low */
+        {
+                unsigned char mask = e100_modem_pins[info->line].cd_mask;
+                unsigned long flags;
+
+                local_irq_save(flags);
+                *e100_modem_pins[info->line].cd_shadow &= ~mask;
+                *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask);
+                *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow;
+                local_irq_restore(flags);
+        }
+#endif
+}
+
+static inline void
+e100_disable_rx(struct e100_serial *info)
+{
+#ifndef CONFIG_SVINTO_SIM
+        /* disable the receiver */
+        info->ioport[REG_REC_CTRL] =
+                (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
+#endif
+}
+
+static inline void
+e100_enable_rx(struct e100_serial *info)
+{
+#ifndef CONFIG_SVINTO_SIM
+        /* enable the receiver */
+        info->ioport[REG_REC_CTRL] =
+                (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable));
+#endif
+}
+
+/* the rx DMA uses both the dma_descr and the dma_eop interrupts */
+
+static inline void
+e100_disable_rxdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("rxdma_irq(%d): 0\n",info->line);
+#endif
+        DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line));
+        *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3);
+}
+
+static inline void
+e100_enable_rxdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("rxdma_irq(%d): 1\n",info->line);
+#endif
+        DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line));
+        *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3);
+}
+
+/* the tx DMA uses only dma_descr interrupt */
+
+static void e100_disable_txdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("txdma_irq(%d): 0\n",info->line);
+#endif
+        DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line));
+        *R_IRQ_MASK2_CLR = info->irq;
+}
+
+static void e100_enable_txdma_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("txdma_irq(%d): 1\n",info->line);
+#endif
+        DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line));
+        *R_IRQ_MASK2_SET = info->irq;
+}
+
+static void e100_disable_txdma_channel(struct e100_serial *info)
+{
+        unsigned long flags;
+
+        /* Disable output DMA channel for the serial port in question
+         * ( set to something other than serialX)
+         */
+        local_irq_save(flags);
+        DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line));
+        if (info->line == 0) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) ==
+                    IO_STATE(R_GEN_CONFIG, dma6, serial0)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma6);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
+                }
+        } else if (info->line == 1) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) ==
+                    IO_STATE(R_GEN_CONFIG, dma8, serial1)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma8);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
+                }
+        } else if (info->line == 2) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) ==
+                    IO_STATE(R_GEN_CONFIG, dma2, serial2)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma2);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
+                }
+        } else if (info->line == 3) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) ==
+                    IO_STATE(R_GEN_CONFIG, dma4, serial3)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma4);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
+                }
+        }
+        *R_GEN_CONFIG = genconfig_shadow;
+        local_irq_restore(flags);
+}
+
+
+static void e100_enable_txdma_channel(struct e100_serial *info)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line));
+        /* Enable output DMA channel for the serial port in question */
+        if (info->line == 0) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma6);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0);
+        } else if (info->line == 1) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma8);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1);
+        } else if (info->line == 2) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma2);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2);
+        } else if (info->line == 3) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma4);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3);
+        }
+        *R_GEN_CONFIG = genconfig_shadow;
+        local_irq_restore(flags);
+}
+
+static void e100_disable_rxdma_channel(struct e100_serial *info)
+{
+        unsigned long flags;
+
+        /* Disable input DMA channel for the serial port in question
+         * ( set to something other than serialX)
+         */
+        local_irq_save(flags);
+        if (info->line == 0) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) ==
+                    IO_STATE(R_GEN_CONFIG, dma7, serial0)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma7);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused);
+                }
+        } else if (info->line == 1) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) ==
+                    IO_STATE(R_GEN_CONFIG, dma9, serial1)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma9);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb);
+                }
+        } else if (info->line == 2) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) ==
+                    IO_STATE(R_GEN_CONFIG, dma3, serial2)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma3);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
+                }
+        } else if (info->line == 3) {
+                if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) ==
+                    IO_STATE(R_GEN_CONFIG, dma5, serial3)) {
+                        genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma5);
+                        genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
+                }
+        }
+        *R_GEN_CONFIG = genconfig_shadow;
+        local_irq_restore(flags);
+}
+
+
+static void e100_enable_rxdma_channel(struct e100_serial *info)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        /* Enable input DMA channel for the serial port in question */
+        if (info->line == 0) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma7);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0);
+        } else if (info->line == 1) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma9);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1);
+        } else if (info->line == 2) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma3);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2);
+        } else if (info->line == 3) {
+                genconfig_shadow &=  ~IO_MASK(R_GEN_CONFIG, dma5);
+                genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3);
+        }
+        *R_GEN_CONFIG = genconfig_shadow;
+        local_irq_restore(flags);
+}
+
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+/* in order to detect and fix errors on the first byte
+   we have to use the serial interrupts as well. */
+
+static inline void
+e100_disable_serial_data_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("ser_irq(%d): 0\n",info->line);
+#endif
+        DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line));
+        *R_IRQ_MASK1_CLR = (1U << (8+2*info->line));
+}
+
+static inline void
+e100_enable_serial_data_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("ser_irq(%d): 1\n",info->line);
+        printk("**** %d = %d\n",
+               (8+2*info->line),
+               (1U << (8+2*info->line)));
+#endif
+        DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line));
+        *R_IRQ_MASK1_SET = (1U << (8+2*info->line));
+}
+#endif
+
+static inline void
+e100_disable_serial_tx_ready_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("ser_tx_irq(%d): 0\n",info->line);
+#endif
+        DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line));
+        *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line));
+}
+
+static inline void
+e100_enable_serial_tx_ready_irq(struct e100_serial *info)
+{
+#ifdef SERIAL_DEBUG_INTR
+        printk("ser_tx_irq(%d): 1\n",info->line);
+        printk("**** %d = %d\n",
+               (8+1+2*info->line),
+               (1U << (8+1+2*info->line)));
+#endif
+        DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line));
+        *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line));
+}
+
+static inline void e100_enable_rx_irq(struct e100_serial *info)
+{
+        if (info->uses_dma_in)
+                e100_enable_rxdma_irq(info);
+        else
+                e100_enable_serial_data_irq(info);
+}
+static inline void e100_disable_rx_irq(struct e100_serial *info)
+{
+        if (info->uses_dma_in)
+                e100_disable_rxdma_irq(info);
+        else
+                e100_disable_serial_data_irq(info);
+}
+
+#if defined(CONFIG_ETRAX_RS485)
+/* Enable RS-485 mode on selected port. This is UGLY. */
+static int
+e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r)
+{
+        struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+
+#if defined(CONFIG_ETRAX_RS485_ON_PA)
+        *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit);
+#endif
+#if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
+        REG_SHADOW_SET(R_PORT_G_DATA,  port_g_data_shadow,
+                       rs485_port_g_bit, 1);
+#endif
+#if defined(CONFIG_ETRAX_RS485_LTC1387)
+        REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
+                       CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 1);
+        REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
+                       CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 1);
+#endif
+
+        info->rs485 = *r;
+
+        /* Maximum delay before RTS equal to 1000 */
+        if (info->rs485.delay_rts_before_send >= 1000)
+                info->rs485.delay_rts_before_send = 1000;
+
+/*      printk("rts: on send = %i, after = %i, enabled = %i",
+                    info->rs485.rts_on_send,
+                    info->rs485.rts_after_sent,
+                    info->rs485.enabled
+        );
+*/
+        return 0;
+}
+
+static int
+e100_write_rs485(struct tty_struct *tty,
+                 const unsigned char *buf, int count)
+{
+        struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+        int old_value = (info->rs485.flags) & SER_RS485_ENABLED;
+
+        /* rs485 is always implicitly enabled if we're using the ioctl()
+         * but it doesn't have to be set in the serial_rs485
+         * (to be backward compatible with old apps)
+         * So we store, set and restore it.
+         */
+        info->rs485.flags |= SER_RS485_ENABLED;
+        /* rs_write now deals with RS485 if enabled */
+        count = rs_write(tty, buf, count);
+        if (!old_value)
+                info->rs485.flags &= ~(SER_RS485_ENABLED);
+        return count;
+}
+
+#ifdef CONFIG_ETRAX_FAST_TIMER
+/* Timer function to toggle RTS when using FAST_TIMER */
+static void rs485_toggle_rts_timer_function(unsigned long data)
+{
+        struct e100_serial *info = (struct e100_serial *)data;
+
+        fast_timers_rs485[info->line].function = NULL;
+        e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND));
+#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
+        e100_enable_rx(info);
+        e100_enable_rx_irq(info);
+#endif
+}
+#endif
+#endif /* CONFIG_ETRAX_RS485 */
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter using the XOFF registers, as necessary.
+ * ------------------------------------------------------------
+ */
+
+static void
+rs_stop(struct tty_struct *tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        if (info) {
+                unsigned long flags;
+                unsigned long xoff;
+
+                local_irq_save(flags);
+                DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n",
+                                CIRC_CNT(info->xmit.head,
+                                         info->xmit.tail,SERIAL_XMIT_SIZE)));
+
+                xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char,
+                                STOP_CHAR(info->port.tty));
+                xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop);
+                if (tty->termios->c_iflag & IXON ) {
+                        xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
+                }
+
+                *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
+                local_irq_restore(flags);
+        }
+}
+
+static void
+rs_start(struct tty_struct *tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        if (info) {
+                unsigned long flags;
+                unsigned long xoff;
+
+                local_irq_save(flags);
+                DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n",
+                                CIRC_CNT(info->xmit.head,
+                                         info->xmit.tail,SERIAL_XMIT_SIZE)));
+                xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty));
+                xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
+                if (tty->termios->c_iflag & IXON ) {
+                        xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
+                }
+
+                *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
+                if (!info->uses_dma_out &&
+                    info->xmit.head != info->xmit.tail && info->xmit.buf)
+                        e100_enable_serial_tx_ready_irq(info);
+
+                local_irq_restore(flags);
+        }
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines.  All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt().  They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off.  People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible.  After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static void rs_sched_event(struct e100_serial *info, int event)
+{
+        if (info->event & (1 << event))
+                return;
+        info->event |= 1 << event;
+        schedule_work(&info->work);
+}
+
+/* The output DMA channel is free - use it to send as many chars as possible
+ * NOTES:
+ *   We don't pay attention to info->x_char, which means if the TTY wants to
+ *   use XON/XOFF it will set info->x_char but we won't send any X char!
+ *
+ *   To implement this, we'd just start a DMA send of 1 byte pointing at a
+ *   buffer containing the X char, and skip updating xmit. We'd also have to
+ *   check if the last sent char was the X char when we enter this function
+ *   the next time, to avoid updating xmit with the sent X value.
+ */
+
+static void
+transmit_chars_dma(struct e100_serial *info)
+{
+        unsigned int c, sentl;
+        struct etrax_dma_descr *descr;
+
+#ifdef CONFIG_SVINTO_SIM
+        /* This will output too little if tail is not 0 always since
+         * we don't reloop to send the other part. Anyway this SHOULD be a
+         * no-op - transmit_chars_dma would never really be called during sim
+         * since rs_write does not write into the xmit buffer then.
+         */
+        if (info->xmit.tail)
+                printk("Error in serial.c:transmit_chars-dma(), tail!=0\n");
+        if (info->xmit.head != info->xmit.tail) {
+                SIMCOUT(info->xmit.buf + info->xmit.tail,
+                        CIRC_CNT(info->xmit.head,
+                                 info->xmit.tail,
+                                 SERIAL_XMIT_SIZE));
+                info->xmit.head = info->xmit.tail;  /* move back head */
+                info->tr_running = 0;
+        }
+        return;
+#endif
+        /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
+        *info->oclrintradr =
+                IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
+                IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
+
+#ifdef SERIAL_DEBUG_INTR
+        if (info->line == SERIAL_DEBUG_LINE)
+                printk("tc\n");
+#endif
+        if (!info->tr_running) {
+                /* weirdo... we shouldn't get here! */
+                printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n");
+                return;
+        }
+
+        descr = &info->tr_descr;
+
+        /* first get the amount of bytes sent during the last DMA transfer,
+           and update xmit accordingly */
+
+        /* if the stop bit was not set, all data has been sent */
+        if (!(descr->status & d_stop)) {
+                sentl = descr->sw_len;
+        } else
+                /* otherwise we find the amount of data sent here */
+                sentl = descr->hw_len;
+
+        DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl));
+
+        /* update stats */
+        info->icount.tx += sentl;
+
+        /* update xmit buffer */
+        info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1);
+
+        /* if there is only a few chars left in the buf, wake up the blocked
+           write if any */
+        if (CIRC_CNT(info->xmit.head,
+                     info->xmit.tail,
+                     SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
+                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+        /* find out the largest amount of consecutive bytes we want to send now */
+
+        c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+
+        /* Don't send all in one DMA transfer - divide it so we wake up
+         * application before all is sent
+         */
+
+        if (c >= 4*WAKEUP_CHARS)
+                c = c/2;
+
+        if (c <= 0) {
+                /* our job here is done, don't schedule any new DMA transfer */
+                info->tr_running = 0;
+
+#if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
+                if (info->rs485.flags & SER_RS485_ENABLED) {
+                        /* Set a short timer to toggle RTS */
+                        start_one_shot_timer(&fast_timers_rs485[info->line],
+                                             rs485_toggle_rts_timer_function,
+                                             (unsigned long)info,
+                                             info->char_time_usec*2,
+                                             "RS-485");
+                }
+#endif /* RS485 */
+                return;
+        }
+
+        /* ok we can schedule a dma send of c chars starting at info->xmit.tail */
+        /* set up the descriptor correctly for output */
+        DFLOW(DEBUG_LOG(info->line, "TX %i\n", c));
+        descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */
+        descr->sw_len = c;
+        descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail);
+        descr->status = 0;
+
+        *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */
+        *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
+
+        /* DMA is now running (hopefully) */
+} /* transmit_chars_dma */
+
+static void
+start_transmit(struct e100_serial *info)
+{
+#if 0
+        if (info->line == SERIAL_DEBUG_LINE)
+                printk("x\n");
+#endif
+
+        info->tr_descr.sw_len = 0;
+        info->tr_descr.hw_len = 0;
+        info->tr_descr.status = 0;
+        info->tr_running = 1;
+        if (info->uses_dma_out)
+                transmit_chars_dma(info);
+        else
+                e100_enable_serial_tx_ready_irq(info);
+} /* start_transmit */
+
+#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
+static int serial_fast_timer_started = 0;
+static int serial_fast_timer_expired = 0;
+static void flush_timeout_function(unsigned long data);
+#define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\
+  unsigned long timer_flags; \
+  local_irq_save(timer_flags); \
+  if (fast_timers[info->line].function == NULL) { \
+    serial_fast_timer_started++; \
+    TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \
+    TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \
+    start_one_shot_timer(&fast_timers[info->line], \
+                         flush_timeout_function, \
+                         (unsigned long)info, \
+                         (usec), \
+                         string); \
+  } \
+  else { \
+    TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \
+  } \
+  local_irq_restore(timer_flags); \
+}
+#define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec)
+
+#else
+#define START_FLUSH_FAST_TIMER_TIME(info, string, usec)
+#define START_FLUSH_FAST_TIMER(info, string)
+#endif
+
+static struct etrax_recv_buffer *
+alloc_recv_buffer(unsigned int size)
+{
+        struct etrax_recv_buffer *buffer;
+
+        if (!(buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC)))
+                return NULL;
+
+        buffer->next = NULL;
+        buffer->length = 0;
+        buffer->error = TTY_NORMAL;
+
+        return buffer;
+}
+
+static void
+append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+
+        if (!info->first_recv_buffer)
+                info->first_recv_buffer = buffer;
+        else
+                info->last_recv_buffer->next = buffer;
+
+        info->last_recv_buffer = buffer;
+
+        info->recv_cnt += buffer->length;
+        if (info->recv_cnt > info->max_recv_cnt)
+                info->max_recv_cnt = info->recv_cnt;
+
+        local_irq_restore(flags);
+}
+
+static int
+add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag)
+{
+        struct etrax_recv_buffer *buffer;
+        if (info->uses_dma_in) {
+                if (!(buffer = alloc_recv_buffer(4)))
+                        return 0;
+
+                buffer->length = 1;
+                buffer->error = flag;
+                buffer->buffer[0] = data;
+
+                append_recv_buffer(info, buffer);
+
+                info->icount.rx++;
+        } else {
+                struct tty_struct *tty = info->port.tty;
+                tty_insert_flip_char(tty, data, flag);
+                info->icount.rx++;
+        }
+
+        return 1;
+}
+
+static unsigned int handle_descr_data(struct e100_serial *info,
+                                      struct etrax_dma_descr *descr,
+                                      unsigned int recvl)
+{
+        struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer;
+
+        if (info->recv_cnt + recvl > 65536) {
+                printk(KERN_CRIT
+                       "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl);
+                return 0;
+        }
+
+        buffer->length = recvl;
+
+        if (info->errorcode == ERRCODE_SET_BREAK)
+                buffer->error = TTY_BREAK;
+        info->errorcode = 0;
+
+        append_recv_buffer(info, buffer);
+
+        if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
+                panic("%s: Failed to allocate memory for receive buffer!\n", __func__);
+
+        descr->buf = virt_to_phys(buffer->buffer);
+
+        return recvl;
+}
+
+static unsigned int handle_all_descr_data(struct e100_serial *info)
+{
+        struct etrax_dma_descr *descr;
+        unsigned int recvl;
+        unsigned int ret = 0;
+
+        while (1)
+        {
+                descr = &info->rec_descr[info->cur_rec_descr];
+
+                if (descr == phys_to_virt(*info->idescradr))
+                        break;
+
+                if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS)
+                        info->cur_rec_descr = 0;
+
+                /* find out how many bytes were read */
+
+                /* if the eop bit was not set, all data has been received */
+                if (!(descr->status & d_eop)) {
+                        recvl = descr->sw_len;
+                } else {
+                        /* otherwise we find the amount of data received here */
+                        recvl = descr->hw_len;
+                }
+
+                /* Reset the status information */
+                descr->status = 0;
+
+                DFLOW(  DEBUG_LOG(info->line, "RX %lu\n", recvl);
+                        if (info->port.tty->stopped) {
+                                unsigned char *buf = phys_to_virt(descr->buf);
+                                DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]);
+                                DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]);
+                                DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]);
+                        }
+                        );
+
+                /* update stats */
+                info->icount.rx += recvl;
+
+                ret += handle_descr_data(info, descr, recvl);
+        }
+
+        return ret;
+}
+
+static void receive_chars_dma(struct e100_serial *info)
+{
+        struct tty_struct *tty;
+        unsigned char rstat;
+
+#ifdef CONFIG_SVINTO_SIM
+        /* No receive in the simulator.  Will probably be when the rest of
+         * the serial interface works, and this piece will just be removed.
+         */
+        return;
+#endif
+
+        /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */
+        *info->iclrintradr =
+                IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
+                IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
+
+        tty = info->port.tty;
+        if (!tty) /* Something wrong... */
+                return;
+
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+        if (info->uses_dma_in)
+                e100_enable_serial_data_irq(info);
+#endif
+
+        if (info->errorcode == ERRCODE_INSERT_BREAK)
+                add_char_and_flag(info, '\0', TTY_BREAK);
+
+        handle_all_descr_data(info);
+
+        /* Read the status register to detect errors */
+        rstat = info->ioport[REG_STATUS];
+        if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
+                DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat));
+        }
+
+        if (rstat & SER_ERROR_MASK) {
+                /* If we got an error, we must reset it by reading the
+                 * data_in field
+                 */
+                unsigned char data = info->ioport[REG_DATA];
+
+                PROCSTAT(ser_stat[info->line].errors_cnt++);
+                DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n",
+                          ((rstat & SER_ERROR_MASK) << 8) | data);
+
+                if (rstat & SER_PAR_ERR_MASK)
+                        add_char_and_flag(info, data, TTY_PARITY);
+                else if (rstat & SER_OVERRUN_MASK)
+                        add_char_and_flag(info, data, TTY_OVERRUN);
+                else if (rstat & SER_FRAMING_ERR_MASK)
+                        add_char_and_flag(info, data, TTY_FRAME);
+        }
+
+        START_FLUSH_FAST_TIMER(info, "receive_chars");
+
+        /* Restart the receiving DMA */
+        *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
+}
+
+static int start_recv_dma(struct e100_serial *info)
+{
+        struct etrax_dma_descr *descr = info->rec_descr;
+        struct etrax_recv_buffer *buffer;
+        int i;
+
+        /* Set up the receiving descriptors */
+        for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) {
+                if (!(buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE)))
+                        panic("%s: Failed to allocate memory for receive buffer!\n", __func__);
+
+                descr[i].ctrl = d_int;
+                descr[i].buf = virt_to_phys(buffer->buffer);
+                descr[i].sw_len = SERIAL_DESCR_BUF_SIZE;
+                descr[i].hw_len = 0;
+                descr[i].status = 0;
+                descr[i].next = virt_to_phys(&descr[i+1]);
+        }
+
+        /* Link the last descriptor to the first */
+        descr[i-1].next = virt_to_phys(&descr[0]);
+
+        /* Start with the first descriptor in the list */
+        info->cur_rec_descr = 0;
+
+        /* Start the DMA */
+        *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]);
+        *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start);
+
+        /* Input DMA should be running now */
+        return 1;
+}
+
+static void
+start_receive(struct e100_serial *info)
+{
+#ifdef CONFIG_SVINTO_SIM
+        /* No receive in the simulator.  Will probably be when the rest of
+         * the serial interface works, and this piece will just be removed.
+         */
+        return;
+#endif
+        if (info->uses_dma_in) {
+                /* reset the input dma channel to be sure it works */
+
+                *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
+                while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
+                       IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
+
+                start_recv_dma(info);
+        }
+}
+
+
+/* the bits in the MASK2 register are laid out like this:
+   DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR
+   where I is the input channel and O is the output channel for the port.
+   info->irq is the bit number for the DMAO_DESCR so to check the others we
+   shift info->irq to the left.
+*/
+
+/* dma output channel interrupt handler
+   this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or
+   DMA8(ser1) when they have finished a descriptor with the intr flag set.
+*/
+
+static irqreturn_t
+tr_interrupt(int irq, void *dev_id)
+{
+        struct e100_serial *info;
+        unsigned long ireg;
+        int i;
+        int handled = 0;
+
+#ifdef CONFIG_SVINTO_SIM
+        /* No receive in the simulator.  Will probably be when the rest of
+         * the serial interface works, and this piece will just be removed.
+         */
+        {
+                const char *s = "What? tr_interrupt in simulator??\n";
+                SIMCOUT(s,strlen(s));
+        }
+        return IRQ_HANDLED;
+#endif
+
+        /* find out the line that caused this irq and get it from rs_table */
+
+        ireg = *R_IRQ_MASK2_RD;  /* get the active irq bits for the dma channels */
+
+        for (i = 0; i < NR_PORTS; i++) {
+                info = rs_table + i;
+                if (!info->enabled || !info->uses_dma_out)
+                        continue;
+                /* check for dma_descr (don't need to check for dma_eop in output dma for serial */
+                if (ireg & info->irq) {
+                        handled = 1;
+                        /* we can send a new dma bunch. make it so. */
+                        DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i));
+                        /* Read jiffies_usec first,
+                         * we want this time to be as late as possible
+                         */
+                        PROCSTAT(ser_stat[info->line].tx_dma_ints++);
+                        info->last_tx_active_usec = GET_JIFFIES_USEC();
+                        info->last_tx_active = jiffies;
+                        transmit_chars_dma(info);
+                }
+
+                /* FIXME: here we should really check for a change in the
+                   status lines and if so call status_handle(info) */
+        }
+        return IRQ_RETVAL(handled);
+} /* tr_interrupt */
+
+/* dma input channel interrupt handler */
+
+static irqreturn_t
+rec_interrupt(int irq, void *dev_id)
+{
+        struct e100_serial *info;
+        unsigned long ireg;
+        int i;
+        int handled = 0;
+
+#ifdef CONFIG_SVINTO_SIM
+        /* No receive in the simulator.  Will probably be when the rest of
+         * the serial interface works, and this piece will just be removed.
+         */
+        {
+                const char *s = "What? rec_interrupt in simulator??\n";
+                SIMCOUT(s,strlen(s));
+        }
+        return IRQ_HANDLED;
+#endif
+
+        /* find out the line that caused this irq and get it from rs_table */
+
+        ireg = *R_IRQ_MASK2_RD;  /* get the active irq bits for the dma channels */
+
+        for (i = 0; i < NR_PORTS; i++) {
+                info = rs_table + i;
+                if (!info->enabled || !info->uses_dma_in)
+                        continue;
+                /* check for both dma_eop and dma_descr for the input dma channel */
+                if (ireg & ((info->irq << 2) | (info->irq << 3))) {
+                        handled = 1;
+                        /* we have received something */
+                        receive_chars_dma(info);
+                }
+
+                /* FIXME: here we should really check for a change in the
+                   status lines and if so call status_handle(info) */
+        }
+        return IRQ_RETVAL(handled);
+} /* rec_interrupt */
+
+static int force_eop_if_needed(struct e100_serial *info)
+{
+        /* We check data_avail bit to determine if data has
+         * arrived since last time
+         */
+        unsigned char rstat = info->ioport[REG_STATUS];
+
+        /* error or datavail? */
+        if (rstat & SER_ERROR_MASK) {
+                /* Some error has occurred. If there has been valid data, an
+                 * EOP interrupt will be made automatically. If no data, the
+                 * normal ser_interrupt should be enabled and handle it.
+                 * So do nothing!
+                 */
+                DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n",
+                          rstat | (info->line << 8));
+                return 0;
+        }
+
+        if (rstat & SER_DATA_AVAIL_MASK) {
+                /* Ok data, no error, count it */
+                TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n",
+                          rstat | (info->line << 8)));
+                /* Read data to clear status flags */
+                (void)info->ioport[REG_DATA];
+
+                info->forced_eop = 0;
+                START_FLUSH_FAST_TIMER(info, "magic");
+                return 0;
+        }
+
+        /* hit the timeout, force an EOP for the input
+         * dma channel if we haven't already
+         */
+        if (!info->forced_eop) {
+                info->forced_eop = 1;
+                PROCSTAT(ser_stat[info->line].timeout_flush_cnt++);
+                TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line));
+                FORCE_EOP(info);
+        }
+
+        return 1;
+}
+
+static void flush_to_flip_buffer(struct e100_serial *info)
+{
+        struct tty_struct *tty;
+        struct etrax_recv_buffer *buffer;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        tty = info->port.tty;
+
+        if (!tty) {
+                local_irq_restore(flags);
+                return;
+        }
+
+        while ((buffer = info->first_recv_buffer) != NULL) {
+                unsigned int count = buffer->length;
+
+                tty_insert_flip_string(tty, buffer->buffer, count);
+                info->recv_cnt -= count;
+
+                if (count == buffer->length) {
+                        info->first_recv_buffer = buffer->next;
+                        kfree(buffer);
+                } else {
+                        buffer->length -= count;
+                        memmove(buffer->buffer, buffer->buffer + count, buffer->length);
+                        buffer->error = TTY_NORMAL;
+                }
+        }
+
+        if (!info->first_recv_buffer)
+                info->last_recv_buffer = NULL;
+
+        local_irq_restore(flags);
+
+        /* This includes a check for low-latency */
+        tty_flip_buffer_push(tty);
+}
+
+static void check_flush_timeout(struct e100_serial *info)
+{
+        /* Flip what we've got (if we can) */
+        flush_to_flip_buffer(info);
+
+        /* We might need to flip later, but not to fast
+         * since the system is busy processing input... */
+        if (info->first_recv_buffer)
+                START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000);
+
+        /* Force eop last, since data might have come while we're processing
+         * and if we started the slow timer above, we won't start a fast
+         * below.
+         */
+        force_eop_if_needed(info);
+}
+
+#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
+static void flush_timeout_function(unsigned long data)
+{
+        struct e100_serial *info = (struct e100_serial *)data;
+
+        fast_timers[info->line].function = NULL;
+        serial_fast_timer_expired++;
+        TIMERD(DEBUG_LOG(info->line, "flush_timout %i ", info->line));
+        TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired));
+        check_flush_timeout(info);
+}
+
+#else
+
+/* dma fifo/buffer timeout handler
+   forces an end-of-packet for the dma input channel if no chars
+   have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s.
+*/
+
+static struct timer_list flush_timer;
+
+static void
+timed_flush_handler(unsigned long ptr)
+{
+        struct e100_serial *info;
+        int i;
+
+#ifdef CONFIG_SVINTO_SIM
+        return;
+#endif
+
+        for (i = 0; i < NR_PORTS; i++) {
+                info = rs_table + i;
+                if (info->uses_dma_in)
+                        check_flush_timeout(info);
+        }
+
+        /* restart flush timer */
+        mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS);
+}
+#endif
+
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+
+/* If there is an error (ie break) when the DMA is running and
+ * there are no bytes in the fifo the DMA is stopped and we get no
+ * eop interrupt. Thus we have to monitor the first bytes on a DMA
+ * transfer, and if it is without error we can turn the serial
+ * interrupts off.
+ */
+
+/*
+BREAK handling on ETRAX 100:
+ETRAX will generate interrupt although there is no stop bit between the
+characters.
+
+Depending on how long the break sequence is, the end of the breaksequence
+will look differently:
+| indicates start/end of a character.
+
+B= Break character (0x00) with framing error.
+E= Error byte with parity error received after B characters.
+F= "Faked" valid byte received immediately after B characters.
+V= Valid byte
+
+1.
+    B          BL         ___________________________ V
+.._|__________|__________|                           |valid data |
+
+Multiple frame errors with data == 0x00 (B),
+the timing matches up "perfectly" so no extra ending char is detected.
+The RXD pin is 1 in the last interrupt, in that case
+we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really
+know if another byte will come and this really is case 2. below
+(e.g F=0xFF or 0xFE)
+If RXD pin is 0 we can expect another character (see 2. below).
+
+
+2.
+
+    B          B          E or F__________________..__ V
+.._|__________|__________|______    |                 |valid data
+                          "valid" or
+                          parity error
+
+Multiple frame errors with data == 0x00 (B),
+but the part of the break trigs is interpreted as a start bit (and possibly
+some 0 bits followed by a number of 1 bits and a stop bit).
+Depending on parity settings etc. this last character can be either
+a fake "valid" char (F) or have a parity error (E).
+
+If the character is valid it will be put in the buffer,
+we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt
+will set the flags so the tty will handle it,
+if it's an error byte it will not be put in the buffer
+and we set info->errorcode = ERRCODE_INSERT_BREAK.
+
+To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp
+of the last faulty char (B) and compares it with the current time:
+If the time elapsed time is less then 2*char_time_usec we will assume
+it's a faked F char and not a Valid char and set
+info->errorcode = ERRCODE_SET_BREAK.
+
+Flaws in the above solution:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+We use the timer to distinguish a F character from a V character,
+if a V character is to close after the break we might make the wrong decision.
+
+TODO: The break will be delayed until an F or V character is received.
+
+*/
+
+static
+struct e100_serial * handle_ser_rx_interrupt_no_dma(struct e100_serial *info)
+{
+        unsigned long data_read;
+        struct tty_struct *tty = info->port.tty;
+
+        if (!tty) {
+                printk("!NO TTY!\n");
+                return info;
+        }
+
+        /* Read data and status at the same time */
+        data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
+more_data:
+        if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) {
+                DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
+        }
+        DINTR2(DEBUG_LOG(info->line, "ser_rx   %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)));
+
+        if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) |
+                          IO_MASK(R_SERIAL0_READ, par_err) |
+                          IO_MASK(R_SERIAL0_READ, overrun) )) {
+                /* An error */
+                info->last_rx_active_usec = GET_JIFFIES_USEC();
+                info->last_rx_active = jiffies;
+                DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read));
+                DLOG_INT_TRIG(
+                if (!log_int_trig1_pos) {
+                        log_int_trig1_pos = log_int_pos;
+                        log_int(rdpc(), 0, 0);
+                }
+                );
+
+
+                if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) &&
+                     (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) {
+                        /* Most likely a break, but we get interrupts over and
+                         * over again.
+                         */
+
+                        if (!info->break_detected_cnt) {
+                                DEBUG_LOG(info->line, "#BRK start\n", 0);
+                        }
+                        if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) {
+                                /* The RX pin is high now, so the break
+                                 * must be over, but....
+                                 * we can't really know if we will get another
+                                 * last byte ending the break or not.
+                                 * And we don't know if the byte (if any) will
+                                 * have an error or look valid.
+                                 */
+                                DEBUG_LOG(info->line, "# BL BRK\n", 0);
+                                info->errorcode = ERRCODE_INSERT_BREAK;
+                        }
+                        info->break_detected_cnt++;
+                } else {
+                        /* The error does not look like a break, but could be
+                         * the end of one
+                         */
+                        if (info->break_detected_cnt) {
+                                DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
+                                info->errorcode = ERRCODE_INSERT_BREAK;
+                        } else {
+                                unsigned char data = IO_EXTRACT(R_SERIAL0_READ,
+                                        data_in, data_read);
+                                char flag = TTY_NORMAL;
+                                if (info->errorcode == ERRCODE_INSERT_BREAK) {
+                                        struct tty_struct *tty = info->port.tty;
+                                        tty_insert_flip_char(tty, 0, flag);
+                                        info->icount.rx++;
+                                }
+
+                                if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) {
+                                        info->icount.parity++;
+                                        flag = TTY_PARITY;
+                                } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) {
+                                        info->icount.overrun++;
+                                        flag = TTY_OVERRUN;
+                                } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) {
+                                        info->icount.frame++;
+                                        flag = TTY_FRAME;
+                                }
+                                tty_insert_flip_char(tty, data, flag);
+                                info->errorcode = 0;
+                        }
+                        info->break_detected_cnt = 0;
+                }
+        } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
+                /* No error */
+                DLOG_INT_TRIG(
+                if (!log_int_trig1_pos) {
+                        if (log_int_pos >= log_int_size) {
+                                log_int_pos = 0;
+                        }
+                        log_int_trig0_pos = log_int_pos;
+                        log_int(rdpc(), 0, 0);
+                }
+                );
+                tty_insert_flip_char(tty,
+                        IO_EXTRACT(R_SERIAL0_READ, data_in, data_read),
+                        TTY_NORMAL);
+        } else {
+                DEBUG_LOG(info->line, "ser_rx int but no data_avail  %08lX\n", data_read);
+        }
+
+
+        info->icount.rx++;
+        data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]);
+        if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) {
+                DEBUG_LOG(info->line, "ser_rx   %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read));
+                goto more_data;
+        }
+
+        tty_flip_buffer_push(info->port.tty);
+        return info;
+}
+
+static struct e100_serial* handle_ser_rx_interrupt(struct e100_serial *info)
+{
+        unsigned char rstat;
+
+#ifdef SERIAL_DEBUG_INTR
+        printk("Interrupt from serport %d\n", i);
+#endif
+/*      DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */
+        if (!info->uses_dma_in) {
+                return handle_ser_rx_interrupt_no_dma(info);
+        }
+        /* DMA is used */
+        rstat = info->ioport[REG_STATUS];
+        if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) {
+                DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0));
+        }
+
+        if (rstat & SER_ERROR_MASK) {
+                unsigned char data;
+
+                info->last_rx_active_usec = GET_JIFFIES_USEC();
+                info->last_rx_active = jiffies;
+                /* If we got an error, we must reset it by reading the
+                 * data_in field
+                 */
+                data = info->ioport[REG_DATA];
+                DINTR1(DEBUG_LOG(info->line, "ser_rx!  %c\n", data));
+                DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat));
+                if (!data && (rstat & SER_FRAMING_ERR_MASK)) {
+                        /* Most likely a break, but we get interrupts over and
+                         * over again.
+                         */
+
+                        if (!info->break_detected_cnt) {
+                                DEBUG_LOG(info->line, "#BRK start\n", 0);
+                        }
+                        if (rstat & SER_RXD_MASK) {
+                                /* The RX pin is high now, so the break
+                                 * must be over, but....
+                                 * we can't really know if we will get another
+                                 * last byte ending the break or not.
+                                 * And we don't know if the byte (if any) will
+                                 * have an error or look valid.
+                                 */
+                                DEBUG_LOG(info->line, "# BL BRK\n", 0);
+                                info->errorcode = ERRCODE_INSERT_BREAK;
+                        }
+                        info->break_detected_cnt++;
+                } else {
+                        /* The error does not look like a break, but could be
+                         * the end of one
+                         */
+                        if (info->break_detected_cnt) {
+                                DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt);
+                                info->errorcode = ERRCODE_INSERT_BREAK;
+                        } else {
+                                if (info->errorcode == ERRCODE_INSERT_BREAK) {
+                                        info->icount.brk++;
+                                        add_char_and_flag(info, '\0', TTY_BREAK);
+                                }
+
+                                if (rstat & SER_PAR_ERR_MASK) {
+                                        info->icount.parity++;
+                                        add_char_and_flag(info, data, TTY_PARITY);
+                                } else if (rstat & SER_OVERRUN_MASK) {
+                                        info->icount.overrun++;
+                                        add_char_and_flag(info, data, TTY_OVERRUN);
+                                } else if (rstat & SER_FRAMING_ERR_MASK) {
+                                        info->icount.frame++;
+                                        add_char_and_flag(info, data, TTY_FRAME);
+                                }
+
+                                info->errorcode = 0;
+                        }
+                        info->break_detected_cnt = 0;
+                        DEBUG_LOG(info->line, "#iERR s d %04X\n",
+                                  ((rstat & SER_ERROR_MASK) << 8) | data);
+                }
+                PROCSTAT(ser_stat[info->line].early_errors_cnt++);
+        } else { /* It was a valid byte, now let the DMA do the rest */
+                unsigned long curr_time_u = GET_JIFFIES_USEC();
+                unsigned long curr_time = jiffies;
+
+                if (info->break_detected_cnt) {
+                        /* Detect if this character is a new valid char or the
+                         * last char in a break sequence: If LSBits are 0 and
+                         * MSBits are high AND the time is close to the
+                         * previous interrupt we should discard it.
+                         */
+                        long elapsed_usec =
+                          (curr_time - info->last_rx_active) * (1000000/HZ) +
+                          curr_time_u - info->last_rx_active_usec;
+                        if (elapsed_usec < 2*info->char_time_usec) {
+                                DEBUG_LOG(info->line, "FBRK %i\n", info->line);
+                                /* Report as BREAK (error) and let
+                                 * receive_chars_dma() handle it
+                                 */
+                                info->errorcode = ERRCODE_SET_BREAK;
+                        } else {
+                                DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line);
+                        }
+                        DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt);
+                }
+
+#ifdef SERIAL_DEBUG_INTR
+                printk("** OK, disabling ser_interrupts\n");
+#endif
+                e100_disable_serial_data_irq(info);
+                DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line));
+                info->break_detected_cnt = 0;
+
+                PROCSTAT(ser_stat[info->line].ser_ints_ok_cnt++);
+        }
+        /* Restarting the DMA never hurts */
+        *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart);
+        START_FLUSH_FAST_TIMER(info, "ser_int");
+        return info;
+} /* handle_ser_rx_interrupt */
+
+static void handle_ser_tx_interrupt(struct e100_serial *info)
+{
+        unsigned long flags;
+
+        if (info->x_char) {
+                unsigned char rstat;
+                DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char));
+                local_irq_save(flags);
+                rstat = info->ioport[REG_STATUS];
+                DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
+
+                info->ioport[REG_TR_DATA] = info->x_char;
+                info->icount.tx++;
+                info->x_char = 0;
+                /* We must enable since it is disabled in ser_interrupt */
+                e100_enable_serial_tx_ready_irq(info);
+                local_irq_restore(flags);
+                return;
+        }
+        if (info->uses_dma_out) {
+                unsigned char rstat;
+                int i;
+                /* We only use normal tx interrupt when sending x_char */
+                DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0));
+                local_irq_save(flags);
+                rstat = info->ioport[REG_STATUS];
+                DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat));
+                e100_disable_serial_tx_ready_irq(info);
+                if (info->port.tty->stopped)
+                        rs_stop(info->port.tty);
+                /* Enable the DMA channel and tell it to continue */
+                e100_enable_txdma_channel(info);
+                /* Wait 12 cycles before doing the DMA command */
+                for(i = 6;  i > 0; i--)
+                        nop();
+
+                *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue);
+                local_irq_restore(flags);
+                return;
+        }
+        /* Normal char-by-char interrupt */
+        if (info->xmit.head == info->xmit.tail
+            || info->port.tty->stopped
+            || info->port.tty->hw_stopped) {
+                DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n",
+                                info->port.tty->stopped));
+                e100_disable_serial_tx_ready_irq(info);
+                info->tr_running = 0;
+                return;
+        }
+        DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail]));
+        /* Send a byte, rs485 timing is critical so turn of ints */
+        local_irq_save(flags);
+        info->ioport[REG_TR_DATA] = info->xmit.buf[info->xmit.tail];
+        info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
+        info->icount.tx++;
+        if (info->xmit.head == info->xmit.tail) {
+#if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER)
+                if (info->rs485.flags & SER_RS485_ENABLED) {
+                        /* Set a short timer to toggle RTS */
+                        start_one_shot_timer(&fast_timers_rs485[info->line],
+                                             rs485_toggle_rts_timer_function,
+                                             (unsigned long)info,
+                                             info->char_time_usec*2,
+                                             "RS-485");
+                }
+#endif /* RS485 */
+                info->last_tx_active_usec = GET_JIFFIES_USEC();
+                info->last_tx_active = jiffies;
+                e100_disable_serial_tx_ready_irq(info);
+                info->tr_running = 0;
+                DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0));
+        } else {
+                /* We must enable since it is disabled in ser_interrupt */
+                e100_enable_serial_tx_ready_irq(info);
+        }
+        local_irq_restore(flags);
+
+        if (CIRC_CNT(info->xmit.head,
+                     info->xmit.tail,
+                     SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
+                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+} /* handle_ser_tx_interrupt */
+
+/* result of time measurements:
+ * RX duration 54-60 us when doing something, otherwise 6-9 us
+ * ser_int duration: just sending: 8-15 us normally, up to 73 us
+ */
+static irqreturn_t
+ser_interrupt(int irq, void *dev_id)
+{
+        static volatile int tx_started = 0;
+        struct e100_serial *info;
+        int i;
+        unsigned long flags;
+        unsigned long irq_mask1_rd;
+        unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */
+        int handled = 0;
+        static volatile unsigned long reentered_ready_mask = 0;
+
+        local_irq_save(flags);
+        irq_mask1_rd = *R_IRQ_MASK1_RD;
+        /* First handle all rx interrupts with ints disabled */
+        info = rs_table;
+        irq_mask1_rd &= e100_ser_int_mask;
+        for (i = 0; i < NR_PORTS; i++) {
+                /* Which line caused the data irq? */
+                if (irq_mask1_rd & data_mask) {
+                        handled = 1;
+                        handle_ser_rx_interrupt(info);
+                }
+                info += 1;
+                data_mask <<= 2;
+        }
+        /* Handle tx interrupts with interrupts enabled so we
+         * can take care of new data interrupts while transmitting
+         * We protect the tx part with the tx_started flag.
+         * We disable the tr_ready interrupts we are about to handle and
+         * unblock the serial interrupt so new serial interrupts may come.
+         *
+         * If we get a new interrupt:
+         *  - it migth be due to synchronous serial ports.
+         *  - serial irq will be blocked by general irq handler.
+         *  - async data will be handled above (sync will be ignored).
+         *  - tx_started flag will prevent us from trying to send again and
+         *    we will exit fast - no need to unblock serial irq.
+         *  - Next (sync) serial interrupt handler will be runned with
+         *    disabled interrupt due to restore_flags() at end of function,
+         *    so sync handler will not be preempted or reentered.
+         */
+        if (!tx_started) {
+                unsigned long ready_mask;
+                unsigned long
+                tx_started = 1;
+                /* Only the tr_ready interrupts left */
+                irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
+                                 IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
+                                 IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
+                                 IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
+                while (irq_mask1_rd) {
+                        /* Disable those we are about to handle */
+                        *R_IRQ_MASK1_CLR = irq_mask1_rd;
+                        /* Unblock the serial interrupt */
+                        *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
+
+                        local_irq_enable();
+                        ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */
+                        info = rs_table;
+                        for (i = 0; i < NR_PORTS; i++) {
+                                /* Which line caused the ready irq? */
+                                if (irq_mask1_rd & ready_mask) {
+                                        handled = 1;
+                                        handle_ser_tx_interrupt(info);
+                                }
+                                info += 1;
+                                ready_mask <<= 2;
+                        }
+                        /* handle_ser_tx_interrupt enables tr_ready interrupts */
+                        local_irq_disable();
+                        /* Handle reentered TX interrupt */
+                        irq_mask1_rd = reentered_ready_mask;
+                }
+                local_irq_disable();
+                tx_started = 0;
+        } else {
+                unsigned long ready_mask;
+                ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) |
+                                             IO_MASK(R_IRQ_MASK1_RD, ser1_ready) |
+                                             IO_MASK(R_IRQ_MASK1_RD, ser2_ready) |
+                                             IO_MASK(R_IRQ_MASK1_RD, ser3_ready));
+                if (ready_mask) {
+                        reentered_ready_mask |= ready_mask;
+                        /* Disable those we are about to handle */
+                        *R_IRQ_MASK1_CLR = ready_mask;
+                        DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask));
+                }
+        }
+
+        local_irq_restore(flags);
+        return IRQ_RETVAL(handled);
+} /* ser_interrupt */
+#endif
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void
+do_softint(struct work_struct *work)
+{
+        struct e100_serial      *info;
+        struct tty_struct       *tty;
+
+        info = container_of(work, struct e100_serial, work);
+
+        tty = info->port.tty;
+        if (!tty)
+                return;
+
+        if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
+                tty_wakeup(tty);
+}
+
+static int
+startup(struct e100_serial * info)
+{
+        unsigned long flags;
+        unsigned long xmit_page;
+        int i;
+
+        xmit_page = get_zeroed_page(GFP_KERNEL);
+        if (!xmit_page)
+                return -ENOMEM;
+
+        local_irq_save(flags);
+
+        /* if it was already initialized, skip this */
+
+        if (info->flags & ASYNC_INITIALIZED) {
+                local_irq_restore(flags);
+                free_page(xmit_page);
+                return 0;
+        }
+
+        if (info->xmit.buf)
+                free_page(xmit_page);
+        else
+                info->xmit.buf = (unsigned char *) xmit_page;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf);
+#endif
+
+#ifdef CONFIG_SVINTO_SIM
+        /* Bits and pieces collected from below.  Better to have them
+           in one ifdef:ed clause than to mix in a lot of ifdefs,
+           right? */
+        if (info->port.tty)
+                clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->xmit.head = info->xmit.tail = 0;
+        info->first_recv_buffer = info->last_recv_buffer = NULL;
+        info->recv_cnt = info->max_recv_cnt = 0;
+
+        for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
+                info->rec_descr[i].buf = NULL;
+
+        /* No real action in the simulator, but may set info important
+           to ioctl. */
+        change_speed(info);
+#else
+
+        /*
+         * Clear the FIFO buffers and disable them
+         * (they will be reenabled in change_speed())
+         */
+
+        /*
+         * Reset the DMA channels and make sure their interrupts are cleared
+         */
+
+        if (info->dma_in_enabled) {
+                info->uses_dma_in = 1;
+                e100_enable_rxdma_channel(info);
+
+                *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
+
+                /* Wait until reset cycle is complete */
+                while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) ==
+                       IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
+
+                /* Make sure the irqs are cleared */
+                *info->iclrintradr =
+                        IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
+                        IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
+        } else {
+                e100_disable_rxdma_channel(info);
+        }
+
+        if (info->dma_out_enabled) {
+                info->uses_dma_out = 1;
+                e100_enable_txdma_channel(info);
+                *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
+
+                while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) ==
+                       IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset));
+
+                /* Make sure the irqs are cleared */
+                *info->oclrintradr =
+                        IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) |
+                        IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do);
+        } else {
+                e100_disable_txdma_channel(info);
+        }
+
+        if (info->port.tty)
+                clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->xmit.head = info->xmit.tail = 0;
+        info->first_recv_buffer = info->last_recv_buffer = NULL;
+        info->recv_cnt = info->max_recv_cnt = 0;
+
+        for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
+                info->rec_descr[i].buf = 0;
+
+        /*
+         * and set the speed and other flags of the serial port
+         * this will start the rx/tx as well
+         */
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+        e100_enable_serial_data_irq(info);
+#endif
+        change_speed(info);
+
+        /* dummy read to reset any serial errors */
+
+        (void)info->ioport[REG_DATA];
+
+        /* enable the interrupts */
+        if (info->uses_dma_out)
+                e100_enable_txdma_irq(info);
+
+        e100_enable_rx_irq(info);
+
+        info->tr_running = 0; /* to be sure we don't lock up the transmitter */
+
+        /* setup the dma input descriptor and start dma */
+
+        start_receive(info);
+
+        /* for safety, make sure the descriptors last result is 0 bytes written */
+
+        info->tr_descr.sw_len = 0;
+        info->tr_descr.hw_len = 0;
+        info->tr_descr.status = 0;
+
+        /* enable RTS/DTR last */
+
+        e100_rts(info, 1);
+        e100_dtr(info, 1);
+
+#endif /* CONFIG_SVINTO_SIM */
+
+        info->flags |= ASYNC_INITIALIZED;
+
+        local_irq_restore(flags);
+        return 0;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void
+shutdown(struct e100_serial * info)
+{
+        unsigned long flags;
+        struct etrax_dma_descr *descr = info->rec_descr;
+        struct etrax_recv_buffer *buffer;
+        int i;
+
+#ifndef CONFIG_SVINTO_SIM
+        /* shut down the transmitter and receiver */
+        DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line));
+        e100_disable_rx(info);
+        info->ioport[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40);
+
+        /* disable interrupts, reset dma channels */
+        if (info->uses_dma_in) {
+                e100_disable_rxdma_irq(info);
+                *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
+                info->uses_dma_in = 0;
+        } else {
+                e100_disable_serial_data_irq(info);
+        }
+
+        if (info->uses_dma_out) {
+                e100_disable_txdma_irq(info);
+                info->tr_running = 0;
+                *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset);
+                info->uses_dma_out = 0;
+        } else {
+                e100_disable_serial_tx_ready_irq(info);
+                info->tr_running = 0;
+        }
+
+#endif /* CONFIG_SVINTO_SIM */
+
+        if (!(info->flags & ASYNC_INITIALIZED))
+                return;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("Shutting down serial port %d (irq %d)....\n", info->line,
+               info->irq);
+#endif
+
+        local_irq_save(flags);
+
+        if (info->xmit.buf) {
+                free_page((unsigned long)info->xmit.buf);
+                info->xmit.buf = NULL;
+        }
+
+        for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++)
+                if (descr[i].buf) {
+                        buffer = phys_to_virt(descr[i].buf) - sizeof *buffer;
+                        kfree(buffer);
+                        descr[i].buf = 0;
+                }
+
+        if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) {
+                /* hang up DTR and RTS if HUPCL is enabled */
+                e100_dtr(info, 0);
+                e100_rts(info, 0); /* could check CRTSCTS before doing this */
+        }
+
+        if (info->port.tty)
+                set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->flags &= ~ASYNC_INITIALIZED;
+        local_irq_restore(flags);
+}
+
+
+/* change baud rate and other assorted parameters */
+
+static void
+change_speed(struct e100_serial *info)
+{
+        unsigned int cflag;
+        unsigned long xoff;
+        unsigned long flags;
+        /* first some safety checks */
+
+        if (!info->port.tty || !info->port.tty->termios)
+                return;
+        if (!info->ioport)
+                return;
+
+        cflag = info->port.tty->termios->c_cflag;
+
+        /* possibly, the tx/rx should be disabled first to do this safely */
+
+        /* change baud-rate and write it to the hardware */
+        if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) {
+                /* Special baudrate */
+                u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
+                unsigned long alt_source =
+                                IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
+                                IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
+                /* R_ALT_SER_BAUDRATE selects the source */
+                DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n",
+                       (unsigned long)info->baud_base, info->custom_divisor));
+                if (info->baud_base == SERIAL_PRESCALE_BASE) {
+                        /* 0, 2-65535 (0=65536) */
+                        u16 divisor = info->custom_divisor;
+                        /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */
+                        /* baudrate is 3.125MHz/custom_divisor */
+                        alt_source =
+                                IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) |
+                                IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale);
+                        alt_source = 0x11;
+                        DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor));
+                        *R_SERIAL_PRESCALE = divisor;
+                        info->baud = SERIAL_PRESCALE_BASE/divisor;
+                }
+#ifdef CONFIG_ETRAX_EXTERN_PB6CLK_ENABLED
+                else if ((info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8 &&
+                          info->custom_divisor == 1) ||
+                         (info->baud_base==CONFIG_ETRAX_EXTERN_PB6CLK_FREQ &&
+                          info->custom_divisor == 8)) {
+                                /* ext_clk selected */
+                                alt_source =
+                                        IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, extern) |
+                                        IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, extern);
+                                DBAUD(printk("using external baudrate: %lu\n", CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8));
+                                info->baud = CONFIG_ETRAX_EXTERN_PB6CLK_FREQ/8;
+                        }
+#endif
+                else
+                {
+                        /* Bad baudbase, we don't support using timer0
+                         * for baudrate.
+                         */
+                        printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n",
+                               (unsigned long)info->baud_base, info->custom_divisor);
+                }
+                r_alt_ser_baudrate_shadow &= ~mask;
+                r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
+                *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
+        } else {
+                /* Normal baudrate */
+                /* Make sure we use normal baudrate */
+                u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */
+                unsigned long alt_source =
+                        IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) |
+                        IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal);
+                r_alt_ser_baudrate_shadow &= ~mask;
+                r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8));
+#ifndef CONFIG_SVINTO_SIM
+                *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow;
+#endif /* CONFIG_SVINTO_SIM */
+
+                info->baud = cflag_to_baud(cflag);
+#ifndef CONFIG_SVINTO_SIM
+                info->ioport[REG_BAUD] = cflag_to_etrax_baud(cflag);
+#endif /* CONFIG_SVINTO_SIM */
+        }
+
+#ifndef CONFIG_SVINTO_SIM
+        /* start with default settings and then fill in changes */
+        local_irq_save(flags);
+        /* 8 bit, no/even parity */
+        info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) |
+                           IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) |
+                           IO_MASK(R_SERIAL0_REC_CTRL, rec_par));
+
+        /* 8 bit, no/even parity, 1 stop bit, no cts */
+        info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) |
+                           IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) |
+                           IO_MASK(R_SERIAL0_TR_CTRL, tr_par) |
+                           IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) |
+                           IO_MASK(R_SERIAL0_TR_CTRL, auto_cts));
+
+        if ((cflag & CSIZE) == CS7) {
+                /* set 7 bit mode */
+                info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
+                info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
+        }
+
+        if (cflag & CSTOPB) {
+                /* set 2 stop bit mode */
+                info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits);
+        }
+
+        if (cflag & PARENB) {
+                /* enable parity */
+                info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
+                info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
+        }
+
+        if (cflag & CMSPAR) {
+                /* enable stick parity, PARODD mean Mark which matches ETRAX */
+                info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick);
+                info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick);
+        }
+        if (cflag & PARODD) {
+                /* set odd parity (or Mark if CMSPAR) */
+                info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd);
+                info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd);
+        }
+
+        if (cflag & CRTSCTS) {
+                /* enable automatic CTS handling */
+                DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0));
+                info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active);
+        }
+
+        /* make sure the tx and rx are enabled */
+
+        info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable);
+        info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
+
+        /* actually write the control regs to the hardware */
+
+        info->ioport[REG_TR_CTRL] = info->tx_ctrl;
+        info->ioport[REG_REC_CTRL] = info->rx_ctrl;
+        xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->port.tty));
+        xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable);
+        if (info->port.tty->termios->c_iflag & IXON ) {
+                DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n",
+                                STOP_CHAR(info->port.tty)));
+                xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable);
+        }
+
+        *((unsigned long *)&info->ioport[REG_XOFF]) = xoff;
+        local_irq_restore(flags);
+#endif /* !CONFIG_SVINTO_SIM */
+
+        update_char_time(info);
+
+} /* change_speed */
+
+/* start transmitting chars NOW */
+
+static void
+rs_flush_chars(struct tty_struct *tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned long flags;
+
+        if (info->tr_running ||
+            info->xmit.head == info->xmit.tail ||
+            tty->stopped ||
+            tty->hw_stopped ||
+            !info->xmit.buf)
+                return;
+
+#ifdef SERIAL_DEBUG_FLOW
+        printk("rs_flush_chars\n");
+#endif
+
+        /* this protection might not exactly be necessary here */
+
+        local_irq_save(flags);
+        start_transmit(info);
+        local_irq_restore(flags);
+}
+
+static int rs_raw_write(struct tty_struct *tty,
+                        const unsigned char *buf, int count)
+{
+        int     c, ret = 0;
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned long flags;
+
+        /* first some sanity checks */
+
+        if (!tty || !info->xmit.buf || !tmp_buf)
+                return 0;
+
+#ifdef SERIAL_DEBUG_DATA
+        if (info->line == SERIAL_DEBUG_LINE)
+                printk("rs_raw_write (%d), status %d\n",
+                       count, info->ioport[REG_STATUS]);
+#endif
+
+#ifdef CONFIG_SVINTO_SIM
+        /* Really simple.  The output is here and now. */
+        SIMCOUT(buf, count);
+        return count;
+#endif
+        local_save_flags(flags);
+        DFLOW(DEBUG_LOG(info->line, "write count %i ", count));
+        DFLOW(DEBUG_LOG(info->line, "ldisc %i\n", tty->ldisc.chars_in_buffer(tty)));
+
+
+        /* The local_irq_disable/restore_flags pairs below are needed
+         * because the DMA interrupt handler moves the info->xmit values.
+         * the memcpy needs to be in the critical region unfortunately,
+         * because we need to read xmit values, memcpy, write xmit values
+         * in one atomic operation... this could perhaps be avoided by
+         * more clever design.
+         */
+        local_irq_disable();
+                while (count) {
+                        c = CIRC_SPACE_TO_END(info->xmit.head,
+                                              info->xmit.tail,
+                                              SERIAL_XMIT_SIZE);
+
+                        if (count < c)
+                                c = count;
+                        if (c <= 0)
+                                break;
+
+                        memcpy(info->xmit.buf + info->xmit.head, buf, c);
+                        info->xmit.head = (info->xmit.head + c) &
+                                (SERIAL_XMIT_SIZE-1);
+                        buf += c;
+                        count -= c;
+                        ret += c;
+                }
+        local_irq_restore(flags);
+
+        /* enable transmitter if not running, unless the tty is stopped
+         * this does not need IRQ protection since if tr_running == 0
+         * the IRQ's are not running anyway for this port.
+         */
+        DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret));
+
+        if (info->xmit.head != info->xmit.tail &&
+            !tty->stopped &&
+            !tty->hw_stopped &&
+            !info->tr_running) {
+                start_transmit(info);
+        }
+
+        return ret;
+} /* raw_raw_write() */
+
+static int
+rs_write(struct tty_struct *tty,
+         const unsigned char *buf, int count)
+{
+#if defined(CONFIG_ETRAX_RS485)
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+        if (info->rs485.flags & SER_RS485_ENABLED)
+        {
+                /* If we are in RS-485 mode, we need to toggle RTS and disable
+                 * the receiver before initiating a DMA transfer
+                 */
+#ifdef CONFIG_ETRAX_FAST_TIMER
+                /* Abort any started timer */
+                fast_timers_rs485[info->line].function = NULL;
+                del_fast_timer(&fast_timers_rs485[info->line]);
+#endif
+                e100_rts(info, (info->rs485.flags & SER_RS485_RTS_ON_SEND));
+#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
+                e100_disable_rx(info);
+                e100_enable_rx_irq(info);
+#endif
+                if ((info->rs485.flags & SER_RS485_RTS_BEFORE_SEND) &&
+                        (info->rs485.delay_rts_before_send > 0))
+                                msleep(info->rs485.delay_rts_before_send);
+        }
+#endif /* CONFIG_ETRAX_RS485 */
+
+        count = rs_raw_write(tty, buf, count);
+
+#if defined(CONFIG_ETRAX_RS485)
+        if (info->rs485.flags & SER_RS485_ENABLED)
+        {
+                unsigned int val;
+                /* If we are in RS-485 mode the following has to be done:
+                 * wait until DMA is ready
+                 * wait on transmit shift register
+                 * toggle RTS
+                 * enable the receiver
+                 */
+
+                /* Sleep until all sent */
+                tty_wait_until_sent(tty, 0);
+#ifdef CONFIG_ETRAX_FAST_TIMER
+                /* Now sleep a little more so that shift register is empty */
+                schedule_usleep(info->char_time_usec * 2);
+#endif
+                /* wait on transmit shift register */
+                do{
+                        get_lsr_info(info, &val);
+                }while (!(val & TIOCSER_TEMT));
+
+                e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND));
+
+#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER)
+                e100_enable_rx(info);
+                e100_enable_rxdma_irq(info);
+#endif
+        }
+#endif /* CONFIG_ETRAX_RS485 */
+
+        return count;
+} /* rs_write */
+
+
+/* how much space is available in the xmit buffer? */
+
+static int
+rs_write_room(struct tty_struct *tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+        return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+/* How many chars are in the xmit buffer?
+ * This does not include any chars in the transmitter FIFO.
+ * Use wait_until_sent for waiting for FIFO drain.
+ */
+
+static int
+rs_chars_in_buffer(struct tty_struct *tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+        return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+}
+
+/* discard everything in the xmit buffer */
+
+static void
+rs_flush_buffer(struct tty_struct *tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        info->xmit.head = info->xmit.tail = 0;
+        local_irq_restore(flags);
+
+        tty_wakeup(tty);
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ *
+ * Since we use DMA we don't check for info->x_char in transmit_chars_dma(),
+ * but we do it in handle_ser_tx_interrupt().
+ * We disable DMA channel and enable tx ready interrupt and write the
+ * character when possible.
+ */
+static void rs_send_xchar(struct tty_struct *tty, char ch)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned long flags;
+        local_irq_save(flags);
+        if (info->uses_dma_out) {
+                /* Put the DMA on hold and disable the channel */
+                *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold);
+                while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) !=
+                       IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold));
+                e100_disable_txdma_channel(info);
+        }
+
+        /* Must make sure transmitter is not stopped before we can transmit */
+        if (tty->stopped)
+                rs_start(tty);
+
+        /* Enable manual transmit interrupt and send from there */
+        DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch));
+        info->x_char = ch;
+        e100_enable_serial_tx_ready_irq(info);
+        local_irq_restore(flags);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void
+rs_throttle(struct tty_struct * tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+        char    buf[64];
+
+        printk("throttle %s: %lu....\n", tty_name(tty, buf),
+               (unsigned long)tty->ldisc.chars_in_buffer(tty));
+#endif
+        DFLOW(DEBUG_LOG(info->line,"rs_throttle %lu\n", tty->ldisc.chars_in_buffer(tty)));
+
+        /* Do RTS before XOFF since XOFF might take some time */
+        if (tty->termios->c_cflag & CRTSCTS) {
+                /* Turn off RTS line */
+                e100_rts(info, 0);
+        }
+        if (I_IXOFF(tty))
+                rs_send_xchar(tty, STOP_CHAR(tty));
+
+}
+
+static void
+rs_unthrottle(struct tty_struct * tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+        char    buf[64];
+
+        printk("unthrottle %s: %lu....\n", tty_name(tty, buf),
+               (unsigned long)tty->ldisc.chars_in_buffer(tty));
+#endif
+        DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc %d\n", tty->ldisc.chars_in_buffer(tty)));
+        DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count));
+        /* Do RTS before XOFF since XOFF might take some time */
+        if (tty->termios->c_cflag & CRTSCTS) {
+                /* Assert RTS line  */
+                e100_rts(info, 1);
+        }
+
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        rs_send_xchar(tty, START_CHAR(tty));
+        }
+
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int
+get_serial_info(struct e100_serial * info,
+                struct serial_struct * retinfo)
+{
+        struct serial_struct tmp;
+
+        /* this is all probably wrong, there are a lot of fields
+         * here that we don't have in e100_serial and maybe we
+         * should set them to something else than 0.
+         */
+
+        if (!retinfo)
+                return -EFAULT;
+        memset(&tmp, 0, sizeof(tmp));
+        tmp.type = info->type;
+        tmp.line = info->line;
+        tmp.port = (int)info->ioport;
+        tmp.irq = info->irq;
+        tmp.flags = info->flags;
+        tmp.baud_base = info->baud_base;
+        tmp.close_delay = info->close_delay;
+        tmp.closing_wait = info->closing_wait;
+        tmp.custom_divisor = info->custom_divisor;
+        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+                return -EFAULT;
+        return 0;
+}
+
+static int
+set_serial_info(struct e100_serial *info,
+                struct serial_struct *new_info)
+{
+        struct serial_struct new_serial;
+        struct e100_serial old_info;
+        int retval = 0;
+
+        if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
+                return -EFAULT;
+
+        old_info = *info;
+
+        if (!capable(CAP_SYS_ADMIN)) {
+                if ((new_serial.type != info->type) ||
+                    (new_serial.close_delay != info->close_delay) ||
+                    ((new_serial.flags & ~ASYNC_USR_MASK) !=
+                     (info->flags & ~ASYNC_USR_MASK)))
+                        return -EPERM;
+                info->flags = ((info->flags & ~ASYNC_USR_MASK) |
+                               (new_serial.flags & ASYNC_USR_MASK));
+                goto check_and_exit;
+        }
+
+        if (info->count > 1)
+                return -EBUSY;
+
+        /*
+         * OK, past this point, all the error checking has been done.
+         * At this point, we start making changes.....
+         */
+
+        info->baud_base = new_serial.baud_base;
+        info->flags = ((info->flags & ~ASYNC_FLAGS) |
+                       (new_serial.flags & ASYNC_FLAGS));
+        info->custom_divisor = new_serial.custom_divisor;
+        info->type = new_serial.type;
+        info->close_delay = new_serial.close_delay;
+        info->closing_wait = new_serial.closing_wait;
+        info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+ check_and_exit:
+        if (info->flags & ASYNC_INITIALIZED) {
+                change_speed(info);
+        } else
+                retval = startup(info);
+        return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space.
+ */
+static int
+get_lsr_info(struct e100_serial * info, unsigned int *value)
+{
+        unsigned int result = TIOCSER_TEMT;
+#ifndef CONFIG_SVINTO_SIM
+        unsigned long curr_time = jiffies;
+        unsigned long curr_time_usec = GET_JIFFIES_USEC();
+        unsigned long elapsed_usec =
+                (curr_time - info->last_tx_active) * 1000000/HZ +
+                curr_time_usec - info->last_tx_active_usec;
+
+        if (info->xmit.head != info->xmit.tail ||
+            elapsed_usec < 2*info->char_time_usec) {
+                result = 0;
+        }
+#endif
+
+        if (copy_to_user(value, &result, sizeof(int)))
+                return -EFAULT;
+        return 0;
+}
+
+#ifdef SERIAL_DEBUG_IO
+struct state_str
+{
+        int state;
+        const char *str;
+};
+
+const struct state_str control_state_str[] = {
+        {TIOCM_DTR, "DTR" },
+        {TIOCM_RTS, "RTS"},
+        {TIOCM_ST, "ST?" },
+        {TIOCM_SR, "SR?" },
+        {TIOCM_CTS, "CTS" },
+        {TIOCM_CD, "CD" },
+        {TIOCM_RI, "RI" },
+        {TIOCM_DSR, "DSR" },
+        {0, NULL }
+};
+
+char *get_control_state_str(int MLines, char *s)
+{
+        int i = 0;
+
+        s[0]='\0';
+        while (control_state_str[i].str != NULL) {
+                if (MLines & control_state_str[i].state) {
+                        if (s[0] != '\0') {
+                                strcat(s, ", ");
+                        }
+                        strcat(s, control_state_str[i].str);
+                }
+                i++;
+        }
+        return s;
+}
+#endif
+
+static int
+rs_break(struct tty_struct *tty, int break_state)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned long flags;
+
+        if (!info->ioport)
+                return -EIO;
+
+        local_irq_save(flags);
+        if (break_state == -1) {
+                /* Go to manual mode and set the txd pin to 0 */
+                /* Clear bit 7 (txd) and 6 (tr_enable) */
+                info->tx_ctrl &= 0x3F;
+        } else {
+                /* Set bit 7 (txd) and 6 (tr_enable) */
+                info->tx_ctrl |= (0x80 | 0x40);
+        }
+        info->ioport[REG_TR_CTRL] = info->tx_ctrl;
+        local_irq_restore(flags);
+        return 0;
+}
+
+static int
+rs_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned long flags;
+
+        local_irq_save(flags);
+
+        if (clear & TIOCM_RTS)
+                e100_rts(info, 0);
+        if (clear & TIOCM_DTR)
+                e100_dtr(info, 0);
+        /* Handle FEMALE behaviour */
+        if (clear & TIOCM_RI)
+                e100_ri_out(info, 0);
+        if (clear & TIOCM_CD)
+                e100_cd_out(info, 0);
+
+        if (set & TIOCM_RTS)
+                e100_rts(info, 1);
+        if (set & TIOCM_DTR)
+                e100_dtr(info, 1);
+        /* Handle FEMALE behaviour */
+        if (set & TIOCM_RI)
+                e100_ri_out(info, 1);
+        if (set & TIOCM_CD)
+                e100_cd_out(info, 1);
+
+        local_irq_restore(flags);
+        return 0;
+}
+
+static int
+rs_tiocmget(struct tty_struct *tty)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned int result;
+        unsigned long flags;
+
+        local_irq_save(flags);
+
+        result =
+                (!E100_RTS_GET(info) ? TIOCM_RTS : 0)
+                | (!E100_DTR_GET(info) ? TIOCM_DTR : 0)
+                | (!E100_RI_GET(info) ? TIOCM_RNG : 0)
+                | (!E100_DSR_GET(info) ? TIOCM_DSR : 0)
+                | (!E100_CD_GET(info) ? TIOCM_CAR : 0)
+                | (!E100_CTS_GET(info) ? TIOCM_CTS : 0);
+
+        local_irq_restore(flags);
+
+#ifdef SERIAL_DEBUG_IO
+        printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n",
+                info->line, result, result);
+        {
+                char s[100];
+
+                get_control_state_str(result, s);
+                printk(KERN_DEBUG "state: %s\n", s);
+        }
+#endif
+        return result;
+
+}
+
+
+static int
+rs_ioctl(struct tty_struct *tty,
+         unsigned int cmd, unsigned long arg)
+{
+        struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+
+        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
+            (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+                if (tty->flags & (1 << TTY_IO_ERROR))
+                        return -EIO;
+        }
+
+        switch (cmd) {
+        case TIOCGSERIAL:
+                return get_serial_info(info,
+                                       (struct serial_struct *) arg);
+        case TIOCSSERIAL:
+                return set_serial_info(info,
+                                       (struct serial_struct *) arg);
+        case TIOCSERGETLSR: /* Get line status register */
+                return get_lsr_info(info, (unsigned int *) arg);
+
+        case TIOCSERGSTRUCT:
+                if (copy_to_user((struct e100_serial *) arg,
+                                 info, sizeof(struct e100_serial)))
+                        return -EFAULT;
+                return 0;
+
+#if defined(CONFIG_ETRAX_RS485)
+        case TIOCSERSETRS485:
+        {
+                /* In this ioctl we still use the old structure
+                 * rs485_control for backward compatibility
+                 * (if we use serial_rs485, then old user-level code
+                 * wouldn't work anymore...).
+                 * The use of this ioctl is deprecated: use TIOCSRS485
+                 * instead.*/
+                struct rs485_control rs485ctrl;
+                struct serial_rs485 rs485data;
+                printk(KERN_DEBUG "The use of this ioctl is deprecated. Use TIOCSRS485 instead\n");
+                if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg,
+                                sizeof(rs485ctrl)))
+                        return -EFAULT;
+
+                rs485data.delay_rts_before_send = rs485ctrl.delay_rts_before_send;
+                rs485data.flags = 0;
+                if (rs485data.delay_rts_before_send != 0)
+                        rs485data.flags |= SER_RS485_RTS_BEFORE_SEND;
+                else
+                        rs485data.flags &= ~(SER_RS485_RTS_BEFORE_SEND);
+
+                if (rs485ctrl.enabled)
+                        rs485data.flags |= SER_RS485_ENABLED;
+                else
+                        rs485data.flags &= ~(SER_RS485_ENABLED);
+
+                if (rs485ctrl.rts_on_send)
+                        rs485data.flags |= SER_RS485_RTS_ON_SEND;
+                else
+                        rs485data.flags &= ~(SER_RS485_RTS_ON_SEND);
+
+                if (rs485ctrl.rts_after_sent)
+                        rs485data.flags |= SER_RS485_RTS_AFTER_SEND;
+                else
+                        rs485data.flags &= ~(SER_RS485_RTS_AFTER_SEND);
+
+                return e100_enable_rs485(tty, &rs485data);
+        }
+
+        case TIOCSRS485:
+        {
+                /* This is the new version of TIOCSRS485, with new
+                 * data structure serial_rs485 */
+                struct serial_rs485 rs485data;
+                if (copy_from_user(&rs485data, (struct rs485_control *)arg,
+                                sizeof(rs485data)))
+                        return -EFAULT;
+
+                return e100_enable_rs485(tty, &rs485data);
+        }
+
+        case TIOCGRS485:
+        {
+                struct serial_rs485 *rs485data =
+                        &(((struct e100_serial *)tty->driver_data)->rs485);
+                /* This is the ioctl to get RS485 data from user-space */
+                if (copy_to_user((struct serial_rs485 *) arg,
+                                        rs485data,
+                                        sizeof(struct serial_rs485)))
+                        return -EFAULT;
+                break;
+        }
+
+        case TIOCSERWRRS485:
+        {
+                struct rs485_write rs485wr;
+                if (copy_from_user(&rs485wr, (struct rs485_write *)arg,
+                                sizeof(rs485wr)))
+                        return -EFAULT;
+
+                return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size);
+        }
+#endif
+
+        default:
+                return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+static void
+rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+
+        change_speed(info);
+
+        /* Handle turning off CRTSCTS */
+        if ((old_termios->c_cflag & CRTSCTS) &&
+            !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                rs_start(tty);
+        }
+
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ *
+ * This routine is called when the serial port gets closed.  First, we
+ * wait for the last remaining data to be sent.  Then, we unlink its
+ * S structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void
+rs_close(struct tty_struct *tty, struct file * filp)
+{
+        struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+        unsigned long flags;
+
+        if (!info)
+                return;
+
+        /* interrupts are disabled for this entire function */
+
+        local_irq_save(flags);
+
+        if (tty_hung_up_p(filp)) {
+                local_irq_restore(flags);
+                return;
+        }
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("[%d] rs_close ttyS%d, count = %d\n", current->pid,
+               info->line, info->count);
+#endif
+        if ((tty->count == 1) && (info->count != 1)) {
+                /*
+                 * Uh, oh.  tty->count is 1, which means that the tty
+                 * structure will be freed.  Info->count should always
+                 * be one in these conditions.  If it's greater than
+                 * one, we've got real problems, since it means the
+                 * serial port won't be shutdown.
+                 */
+                printk(KERN_CRIT
+                       "rs_close: bad serial port count; tty->count is 1, "
+                       "info->count is %d\n", info->count);
+                info->count = 1;
+        }
+        if (--info->count < 0) {
+                printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n",
+                       info->line, info->count);
+                info->count = 0;
+        }
+        if (info->count) {
+                local_irq_restore(flags);
+                return;
+        }
+        info->flags |= ASYNC_CLOSING;
+        /*
+         * Save the termios structure, since this port may have
+         * separate termios for callout and dialin.
+         */
+        if (info->flags & ASYNC_NORMAL_ACTIVE)
+                info->normal_termios = *tty->termios;
+        /*
+         * Now we wait for the transmit buffer to clear; and we notify
+         * the line discipline to only process XON/XOFF characters.
+         */
+        tty->closing = 1;
+        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+                tty_wait_until_sent(tty, info->closing_wait);
+        /*
+         * At this point we stop accepting input.  To do this, we
+         * disable the serial receiver and the DMA receive interrupt.
+         */
+#ifdef SERIAL_HANDLE_EARLY_ERRORS
+        e100_disable_serial_data_irq(info);
+#endif
+
+#ifndef CONFIG_SVINTO_SIM
+        e100_disable_rx(info);
+        e100_disable_rx_irq(info);
+
+        if (info->flags & ASYNC_INITIALIZED) {
+                /*
+                 * Before we drop DTR, make sure the UART transmitter
+                 * has completely drained; this is especially
+                 * important as we have a transmit FIFO!
+                 */
+                rs_wait_until_sent(tty, HZ);
+        }
+#endif
+
+        shutdown(info);
+        rs_flush_buffer(tty);
+        tty_ldisc_flush(tty);
+        tty->closing = 0;
+        info->event = 0;
+        info->port.tty = NULL;
+        if (info->blocked_open) {
+                if (info->close_delay)
+                        schedule_timeout_interruptible(info->close_delay);
+                wake_up_interruptible(&info->open_wait);
+        }
+        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+        wake_up_interruptible(&info->close_wait);
+        local_irq_restore(flags);
+
+        /* port closed */
+
+#if defined(CONFIG_ETRAX_RS485)
+        if (info->rs485.flags & SER_RS485_ENABLED) {
+                info->rs485.flags &= ~(SER_RS485_ENABLED);
+#if defined(CONFIG_ETRAX_RS485_ON_PA)
+                *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit);
+#endif
+#if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
+                REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
+                               rs485_port_g_bit, 0);
+#endif
+#if defined(CONFIG_ETRAX_RS485_LTC1387)
+                REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
+                               CONFIG_ETRAX_RS485_LTC1387_DXEN_PORT_G_BIT, 0);
+                REG_SHADOW_SET(R_PORT_G_DATA, port_g_data_shadow,
+                               CONFIG_ETRAX_RS485_LTC1387_RXEN_PORT_G_BIT, 0);
+#endif
+        }
+#endif
+
+        /*
+         * Release any allocated DMA irq's.
+         */
+        if (info->dma_in_enabled) {
+                free_irq(info->dma_in_irq_nbr, info);
+                cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
+                info->uses_dma_in = 0;
+#ifdef SERIAL_DEBUG_OPEN
+                printk(KERN_DEBUG "DMA irq '%s' freed\n",
+                        info->dma_in_irq_description);
+#endif
+        }
+        if (info->dma_out_enabled) {
+                free_irq(info->dma_out_irq_nbr, info);
+                cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
+                info->uses_dma_out = 0;
+#ifdef SERIAL_DEBUG_OPEN
+                printk(KERN_DEBUG "DMA irq '%s' freed\n",
+                        info->dma_out_irq_description);
+#endif
+        }
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        unsigned long orig_jiffies;
+        struct e100_serial *info = (struct e100_serial *)tty->driver_data;
+        unsigned long curr_time = jiffies;
+        unsigned long curr_time_usec = GET_JIFFIES_USEC();
+        long elapsed_usec =
+                (curr_time - info->last_tx_active) * (1000000/HZ) +
+                curr_time_usec - info->last_tx_active_usec;
+
+        /*
+         * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO
+         * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k)
+         */
+        orig_jiffies = jiffies;
+        while (info->xmit.head != info->xmit.tail || /* More in send queue */
+               (*info->ostatusadr & 0x007f) ||  /* more in FIFO */
+               (elapsed_usec < 2*info->char_time_usec)) {
+                schedule_timeout_interruptible(1);
+                if (signal_pending(current))
+                        break;
+                if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                        break;
+                curr_time = jiffies;
+                curr_time_usec = GET_JIFFIES_USEC();
+                elapsed_usec =
+                        (curr_time - info->last_tx_active) * (1000000/HZ) +
+                        curr_time_usec - info->last_tx_active_usec;
+        }
+        set_current_state(TASK_RUNNING);
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void
+rs_hangup(struct tty_struct *tty)
+{
+        struct e100_serial * info = (struct e100_serial *)tty->driver_data;
+
+        rs_flush_buffer(tty);
+        shutdown(info);
+        info->event = 0;
+        info->count = 0;
+        info->flags &= ~ASYNC_NORMAL_ACTIVE;
+        info->port.tty = NULL;
+        wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int
+block_til_ready(struct tty_struct *tty, struct file * filp,
+                struct e100_serial *info)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        unsigned long   flags;
+        int             retval;
+        int             do_clocal = 0, extra_count = 0;
+
+        /*
+         * If the device is in the middle of being closed, then block
+         * until it's done, and then try again.
+         */
+        if (tty_hung_up_p(filp) ||
+            (info->flags & ASYNC_CLOSING)) {
+                wait_event_interruptible_tty(info->close_wait,
+                        !(info->flags & ASYNC_CLOSING));
+#ifdef SERIAL_DO_RESTART
+                if (info->flags & ASYNC_HUP_NOTIFY)
+                        return -EAGAIN;
+                else
+                        return -ERESTARTSYS;
+#else
+                return -EAGAIN;
+#endif
+        }
+
+        /*
+         * If non-blocking mode is set, or the port is not enabled,
+         * then make the check up front and then exit.
+         */
+        if ((filp->f_flags & O_NONBLOCK) ||
+            (tty->flags & (1 << TTY_IO_ERROR))) {
+                info->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (tty->termios->c_cflag & CLOCAL) {
+                        do_clocal = 1;
+        }
+
+        /*
+         * Block waiting for the carrier detect and the line to become
+         * free (i.e., not in use by the callout).  While we are in
+         * this loop, info->count is dropped by one, so that
+         * rs_close() knows when to free things.  We restore it upon
+         * exit, either normal or abnormal.
+         */
+        retval = 0;
+        add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+        printk("block_til_ready before block: ttyS%d, count = %d\n",
+               info->line, info->count);
+#endif
+        local_irq_save(flags);
+        if (!tty_hung_up_p(filp)) {
+                extra_count++;
+                info->count--;
+        }
+        local_irq_restore(flags);
+        info->blocked_open++;
+        while (1) {
+                local_irq_save(flags);
+                /* assert RTS and DTR */
+                e100_rts(info, 1);
+                e100_dtr(info, 1);
+                local_irq_restore(flags);
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (tty_hung_up_p(filp) ||
+                    !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+                        if (info->flags & ASYNC_HUP_NOTIFY)
+                                retval = -EAGAIN;
+                        else
+                                retval = -ERESTARTSYS;
+#else
+                        retval = -EAGAIN;
+#endif
+                        break;
+                }
+                if (!(info->flags & ASYNC_CLOSING) && do_clocal)
+                        /* && (do_clocal || DCD_IS_ASSERTED) */
+                        break;
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+#ifdef SERIAL_DEBUG_OPEN
+                printk("block_til_ready blocking: ttyS%d, count = %d\n",
+                       info->line, info->count);
+#endif
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+        set_current_state(TASK_RUNNING);
+        remove_wait_queue(&info->open_wait, &wait);
+        if (extra_count)
+                info->count++;
+        info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+        printk("block_til_ready after blocking: ttyS%d, count = %d\n",
+               info->line, info->count);
+#endif
+        if (retval)
+                return retval;
+        info->flags |= ASYNC_NORMAL_ACTIVE;
+        return 0;
+}
+
+static void
+deinit_port(struct e100_serial *info)
+{
+        if (info->dma_out_enabled) {
+                cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description);
+                free_irq(info->dma_out_irq_nbr, info);
+        }
+        if (info->dma_in_enabled) {
+                cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description);
+                free_irq(info->dma_in_irq_nbr, info);
+        }
+}
+
+/*
+ * This routine is called whenever a serial port is opened.
+ * It performs the serial-specific initialization for the tty structure.
+ */
+static int
+rs_open(struct tty_struct *tty, struct file * filp)
+{
+        struct e100_serial      *info;
+        int                     retval, line;
+        unsigned long           page;
+        int                     allocated_resources = 0;
+
+        /* find which port we want to open */
+        line = tty->index;
+
+        if (line < 0 || line >= NR_PORTS)
+                return -ENODEV;
+
+        /* find the corresponding e100_serial struct in the table */
+        info = rs_table + line;
+
+        /* don't allow the opening of ports that are not enabled in the HW config */
+        if (!info->enabled)
+                return -ENODEV;
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name,
+               info->count);
+#endif
+
+        info->count++;
+        tty->driver_data = info;
+        info->port.tty = tty;
+
+        info->port.tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+        if (!tmp_buf) {
+                page = get_zeroed_page(GFP_KERNEL);
+                if (!page) {
+                        return -ENOMEM;
+                }
+                if (tmp_buf)
+                        free_page(page);
+                else
+                        tmp_buf = (unsigned char *) page;
+        }
+
+        /*
+         * If the port is in the middle of closing, bail out now
+         */
+        if (tty_hung_up_p(filp) ||
+            (info->flags & ASYNC_CLOSING)) {
+                wait_event_interruptible_tty(info->close_wait,
+                        !(info->flags & ASYNC_CLOSING));
+#ifdef SERIAL_DO_RESTART
+                return ((info->flags & ASYNC_HUP_NOTIFY) ?
+                        -EAGAIN : -ERESTARTSYS);
+#else
+                return -EAGAIN;
+#endif
+        }
+
+        /*
+         * If DMA is enabled try to allocate the irq's.
+         */
+        if (info->count == 1) {
+                allocated_resources = 1;
+                if (info->dma_in_enabled) {
+                        if (request_irq(info->dma_in_irq_nbr,
+                                        rec_interrupt,
+                                        info->dma_in_irq_flags,
+                                        info->dma_in_irq_description,
+                                        info)) {
+                                printk(KERN_WARNING "DMA irq '%s' busy; "
+                                        "falling back to non-DMA mode\n",
+                                        info->dma_in_irq_description);
+                                /* Make sure we never try to use DMA in */
+                                /* for the port again. */
+                                info->dma_in_enabled = 0;
+                        } else if (cris_request_dma(info->dma_in_nbr,
+                                        info->dma_in_irq_description,
+                                        DMA_VERBOSE_ON_ERROR,
+                                        info->dma_owner)) {
+                                free_irq(info->dma_in_irq_nbr, info);
+                                printk(KERN_WARNING "DMA '%s' busy; "
+                                        "falling back to non-DMA mode\n",
+                                        info->dma_in_irq_description);
+                                /* Make sure we never try to use DMA in */
+                                /* for the port again. */
+                                info->dma_in_enabled = 0;
+                        }
+#ifdef SERIAL_DEBUG_OPEN
+                        else
+                                printk(KERN_DEBUG "DMA irq '%s' allocated\n",
+                                        info->dma_in_irq_description);
+#endif
+                }
+                if (info->dma_out_enabled) {
+                        if (request_irq(info->dma_out_irq_nbr,
+                                               tr_interrupt,
+                                               info->dma_out_irq_flags,
+                                               info->dma_out_irq_description,
+                                               info)) {
+                                printk(KERN_WARNING "DMA irq '%s' busy; "
+                                        "falling back to non-DMA mode\n",
+                                        info->dma_out_irq_description);
+                                /* Make sure we never try to use DMA out */
+                                /* for the port again. */
+                                info->dma_out_enabled = 0;
+                        } else if (cris_request_dma(info->dma_out_nbr,
+                                             info->dma_out_irq_description,
+                                             DMA_VERBOSE_ON_ERROR,
+                                             info->dma_owner)) {
+                                free_irq(info->dma_out_irq_nbr, info);
+                                printk(KERN_WARNING "DMA '%s' busy; "
+                                        "falling back to non-DMA mode\n",
+                                        info->dma_out_irq_description);
+                                /* Make sure we never try to use DMA out */
+                                /* for the port again. */
+                                info->dma_out_enabled = 0;
+                        }
+#ifdef SERIAL_DEBUG_OPEN
+                        else
+                                printk(KERN_DEBUG "DMA irq '%s' allocated\n",
+                                        info->dma_out_irq_description);
+#endif
+                }
+        }
+
+        /*
+         * Start up the serial port
+         */
+
+        retval = startup(info);
+        if (retval) {
+                if (allocated_resources)
+                        deinit_port(info);
+
+                /* FIXME Decrease count info->count here too? */
+                return retval;
+        }
+
+
+        retval = block_til_ready(tty, filp, info);
+        if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+                printk("rs_open returning after block_til_ready with %d\n",
+                       retval);
+#endif
+                if (allocated_resources)
+                        deinit_port(info);
+
+                return retval;
+        }
+
+        if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
+                *tty->termios = info->normal_termios;
+                change_speed(info);
+        }
+
+#ifdef SERIAL_DEBUG_OPEN
+        printk("rs_open ttyS%d successful...\n", info->line);
+#endif
+        DLOG_INT_TRIG( log_int_pos = 0);
+
+        DFLIP(  if (info->line == SERIAL_DEBUG_LINE) {
+                        info->icount.rx = 0;
+                } );
+
+        return 0;
+}
+
+#ifdef CONFIG_PROC_FS
+/*
+ * /proc fs routines....
+ */
+
+static void seq_line_info(struct seq_file *m, struct e100_serial *info)
+{
+        unsigned long tmp;
+
+        seq_printf(m, "%d: uart:E100 port:%lX irq:%d",
+                   info->line, (unsigned long)info->ioport, info->irq);
+
+        if (!info->ioport || (info->type == PORT_UNKNOWN)) {
+                seq_printf(m, "\n");
+                return;
+        }
+
+        seq_printf(m, " baud:%d", info->baud);
+        seq_printf(m, " tx:%lu rx:%lu",
+                       (unsigned long)info->icount.tx,
+                       (unsigned long)info->icount.rx);
+        tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
+        if (tmp)
+                seq_printf(m, " tx_pend:%lu/%lu",
+                           (unsigned long)tmp,
+                           (unsigned long)SERIAL_XMIT_SIZE);
+
+        seq_printf(m, " rx_pend:%lu/%lu",
+                   (unsigned long)info->recv_cnt,
+                   (unsigned long)info->max_recv_cnt);
+
+#if 1
+        if (info->port.tty) {
+                if (info->port.tty->stopped)
+                        seq_printf(m, " stopped:%i",
+                                   (int)info->port.tty->stopped);
+                if (info->port.tty->hw_stopped)
+                        seq_printf(m, " hw_stopped:%i",
+                                   (int)info->port.tty->hw_stopped);
+        }
+
+        {
+                unsigned char rstat = info->ioport[REG_STATUS];
+                if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect))
+                        seq_printf(m, " xoff_detect:1");
+        }
+
+#endif
+
+        if (info->icount.frame)
+                seq_printf(m, " fe:%lu", (unsigned long)info->icount.frame);
+
+        if (info->icount.parity)
+                seq_printf(m, " pe:%lu", (unsigned long)info->icount.parity);
+
+        if (info->icount.brk)
+                seq_printf(m, " brk:%lu", (unsigned long)info->icount.brk);
+
+        if (info->icount.overrun)
+                seq_printf(m, " oe:%lu", (unsigned long)info->icount.overrun);
+
+        /*
+         * Last thing is the RS-232 status lines
+         */
+        if (!E100_RTS_GET(info))
+                seq_puts(m, "|RTS");
+        if (!E100_CTS_GET(info))
+                seq_puts(m, "|CTS");
+        if (!E100_DTR_GET(info))
+                seq_puts(m, "|DTR");
+        if (!E100_DSR_GET(info))
+                seq_puts(m, "|DSR");
+        if (!E100_CD_GET(info))
+                seq_puts(m, "|CD");
+        if (!E100_RI_GET(info))
+                seq_puts(m, "|RI");
+        seq_puts(m, "\n");
+}
+
+
+static int crisv10_proc_show(struct seq_file *m, void *v)
+{
+        int i;
+
+        seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
+
+        for (i = 0; i < NR_PORTS; i++) {
+                if (!rs_table[i].enabled)
+                        continue;
+                seq_line_info(m, &rs_table[i]);
+        }
+#ifdef DEBUG_LOG_INCLUDED
+        for (i = 0; i < debug_log_pos; i++) {
+                seq_printf(m, "%-4i %lu.%lu ",
+                         i, debug_log[i].time,
+                         timer_data_to_ns(debug_log[i].timer_data));
+                seq_printf(m, debug_log[i].string, debug_log[i].value);
+        }
+        seq_printf(m, "debug_log %i/%i\n", i, DEBUG_LOG_SIZE);
+        debug_log_pos = 0;
+#endif
+        return 0;
+}
+
+static int crisv10_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, crisv10_proc_show, NULL);
+}
+
+static const struct file_operations crisv10_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = crisv10_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+#endif
+
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void show_serial_version(void)
+{
+        printk(KERN_INFO
+               "ETRAX 100LX serial-driver %s, "
+               "(c) 2000-2004 Axis Communications AB\r\n",
+               &serial_version[11]); /* "$Revision: x.yy" */
+}
+
+/* rs_init inits the driver at boot (using the module_init chain) */
+
+static const struct tty_operations rs_ops = {
+        .open = rs_open,
+        .close = rs_close,
+        .write = rs_write,
+        .flush_chars = rs_flush_chars,
+        .write_room = rs_write_room,
+        .chars_in_buffer = rs_chars_in_buffer,
+        .flush_buffer = rs_flush_buffer,
+        .ioctl = rs_ioctl,
+        .throttle = rs_throttle,
+        .unthrottle = rs_unthrottle,
+        .set_termios = rs_set_termios,
+        .stop = rs_stop,
+        .start = rs_start,
+        .hangup = rs_hangup,
+        .break_ctl = rs_break,
+        .send_xchar = rs_send_xchar,
+        .wait_until_sent = rs_wait_until_sent,
+        .tiocmget = rs_tiocmget,
+        .tiocmset = rs_tiocmset,
+#ifdef CONFIG_PROC_FS
+        .proc_fops = &crisv10_proc_fops,
+#endif
+};
+
+static int __init rs_init(void)
+{
+        int i;
+        struct e100_serial *info;
+        struct tty_driver *driver = alloc_tty_driver(NR_PORTS);
+
+        if (!driver)
+                return -ENOMEM;
+
+        show_serial_version();
+
+        /* Setup the timed flush handler system */
+
+#if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER)
+        setup_timer(&flush_timer, timed_flush_handler, 0);
+        mod_timer(&flush_timer, jiffies + 5);
+#endif
+
+#if defined(CONFIG_ETRAX_RS485)
+#if defined(CONFIG_ETRAX_RS485_ON_PA)
+        if (cris_io_interface_allocate_pins(if_ser0, 'a', rs485_pa_bit,
+                        rs485_pa_bit)) {
+                printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
+                        "RS485 pin\n");
+                put_tty_driver(driver);
+                return -EBUSY;
+        }
+#endif
+#if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
+        if (cris_io_interface_allocate_pins(if_ser0, 'g', rs485_pa_bit,
+                        rs485_port_g_bit)) {
+                printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
+                        "RS485 pin\n");
+                put_tty_driver(driver);
+                return -EBUSY;
+        }
+#endif
+#endif
+
+        /* Initialize the tty_driver structure */
+
+        driver->driver_name = "serial";
+        driver->name = "ttyS";
+        driver->major = TTY_MAJOR;
+        driver->minor_start = 64;
+        driver->type = TTY_DRIVER_TYPE_SERIAL;
+        driver->subtype = SERIAL_TYPE_NORMAL;
+        driver->init_termios = tty_std_termios;
+        driver->init_termios.c_cflag =
+                B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */
+        driver->init_termios.c_ispeed = 115200;
+        driver->init_termios.c_ospeed = 115200;
+        driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+
+        tty_set_operations(driver, &rs_ops);
+        serial_driver = driver;
+        if (tty_register_driver(driver))
+                panic("Couldn't register serial driver\n");
+        /* do some initializing for the separate ports */
+
+        for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
+                if (info->enabled) {
+                        if (cris_request_io_interface(info->io_if,
+                                        info->io_if_description)) {
+                                printk(KERN_CRIT "ETRAX100LX async serial: "
+                                        "Could not allocate IO pins for "
+                                        "%s, port %d\n",
+                                        info->io_if_description, i);
+                                info->enabled = 0;
+                        }
+                }
+                info->uses_dma_in = 0;
+                info->uses_dma_out = 0;
+                info->line = i;
+                info->port.tty = NULL;
+                info->type = PORT_ETRAX;
+                info->tr_running = 0;
+                info->forced_eop = 0;
+                info->baud_base = DEF_BAUD_BASE;
+                info->custom_divisor = 0;
+                info->flags = 0;
+                info->close_delay = 5*HZ/10;
+                info->closing_wait = 30*HZ;
+                info->x_char = 0;
+                info->event = 0;
+                info->count = 0;
+                info->blocked_open = 0;
+                info->normal_termios = driver->init_termios;
+                init_waitqueue_head(&info->open_wait);
+                init_waitqueue_head(&info->close_wait);
+                info->xmit.buf = NULL;
+                info->xmit.tail = info->xmit.head = 0;
+                info->first_recv_buffer = info->last_recv_buffer = NULL;
+                info->recv_cnt = info->max_recv_cnt = 0;
+                info->last_tx_active_usec = 0;
+                info->last_tx_active = 0;
+
+#if defined(CONFIG_ETRAX_RS485)
+                /* Set sane defaults */
+                info->rs485.flags &= ~(SER_RS485_RTS_ON_SEND);
+                info->rs485.flags |= SER_RS485_RTS_AFTER_SEND;
+                info->rs485.flags &= ~(SER_RS485_RTS_BEFORE_SEND);
+                info->rs485.delay_rts_before_send = 0;
+                info->rs485.flags &= ~(SER_RS485_ENABLED);
+#endif
+                INIT_WORK(&info->work, do_softint);
+
+                if (info->enabled) {
+                        printk(KERN_INFO "%s%d at %p is a builtin UART with DMA\n",
+                               serial_driver->name, info->line, info->ioport);
+                }
+        }
+#ifdef CONFIG_ETRAX_FAST_TIMER
+#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER
+        memset(fast_timers, 0, sizeof(fast_timers));
+#endif
+#ifdef CONFIG_ETRAX_RS485
+        memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485));
+#endif
+        fast_timer_init();
+#endif
+
+#ifndef CONFIG_SVINTO_SIM
+#ifndef CONFIG_ETRAX_KGDB
+        /* Not needed in simulator.  May only complicate stuff. */
+        /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
+
+        if (request_irq(SERIAL_IRQ_NBR, ser_interrupt,
+                        IRQF_SHARED | IRQF_DISABLED, "serial ", driver))
+                panic("%s: Failed to request irq8", __func__);
+
+#endif
+#endif /* CONFIG_SVINTO_SIM */
+
+        return 0;
+}
+
+/* this makes sure that rs_init is called during kernel boot */
+
+module_init(rs_init);
diff --git a/drivers/tty/serial/crisv10.h b/drivers/tty/serial/crisv10.h
new file mode 100644
index 000000000000..ea0beb46a10d
--- /dev/null
+++ b/drivers/tty/serial/crisv10.h
@@ -0,0 +1,147 @@
+/*
+ * serial.h: Arch-dep definitions for the Etrax100 serial driver.
+ *
+ * Copyright (C) 1998-2007 Axis Communications AB
+ */
+
+#ifndef _ETRAX_SERIAL_H
+#define _ETRAX_SERIAL_H
+
+#include <linux/circ_buf.h>
+#include <asm/termios.h>
+#include <asm/dma.h>
+#include <arch/io_interface_mux.h>
+
+/* Software state per channel */
+
+#ifdef __KERNEL__
+/*
+ * This is our internal structure for each serial port's state.
+ *
+ * Many fields are paralleled by the structure used by the serial_struct
+ * structure.
+ *
+ * For definitions of the flags field, see tty.h
+ */
+
+#define SERIAL_RECV_DESCRIPTORS 8
+
+struct etrax_recv_buffer {
+        struct etrax_recv_buffer *next;
+        unsigned short length;
+        unsigned char error;
+        unsigned char pad;
+
+        unsigned char buffer[0];
+};
+
+struct e100_serial {
+        struct tty_port port;
+        int baud;
+        volatile u8     *ioport;        /* R_SERIALx_CTRL */
+        u32             irq;    /* bitnr in R_IRQ_MASK2 for dmaX_descr */
+
+        /* Output registers */
+        volatile u8 *oclrintradr;       /* adr to R_DMA_CHx_CLR_INTR */
+        volatile u32 *ofirstadr;        /* adr to R_DMA_CHx_FIRST */
+        volatile u8 *ocmdadr;           /* adr to R_DMA_CHx_CMD */
+        const volatile u8 *ostatusadr;  /* adr to R_DMA_CHx_STATUS */
+
+        /* Input registers */
+        volatile u8 *iclrintradr;       /* adr to R_DMA_CHx_CLR_INTR */
+        volatile u32 *ifirstadr;        /* adr to R_DMA_CHx_FIRST */
+        volatile u8 *icmdadr;           /* adr to R_DMA_CHx_CMD */
+        volatile u32 *idescradr;        /* adr to R_DMA_CHx_DESCR */
+
+        int flags;      /* defined in tty.h */
+
+        u8 rx_ctrl;     /* shadow for R_SERIALx_REC_CTRL */
+        u8 tx_ctrl;     /* shadow for R_SERIALx_TR_CTRL */
+        u8 iseteop;     /* bit number for R_SET_EOP for the input dma */
+        int enabled;    /* Set to 1 if the port is enabled in HW config */
+
+        u8 dma_out_enabled;     /* Set to 1 if DMA should be used */
+        u8 dma_in_enabled;      /* Set to 1 if DMA should be used */
+
+        /* end of fields defined in rs_table[] in .c-file */
+        int             dma_owner;
+        unsigned int    dma_in_nbr;
+        unsigned int    dma_out_nbr;
+        unsigned int    dma_in_irq_nbr;
+        unsigned int    dma_out_irq_nbr;
+        unsigned long   dma_in_irq_flags;
+        unsigned long   dma_out_irq_flags;
+        char            *dma_in_irq_description;
+        char            *dma_out_irq_description;
+
+        enum cris_io_interface io_if;
+        char            *io_if_description;
+
+        u8              uses_dma_in;  /* Set to 1 if DMA is used */
+        u8              uses_dma_out; /* Set to 1 if DMA is used */
+        u8              forced_eop;   /* a fifo eop has been forced */
+        int                     baud_base;     /* For special baudrates */
+        int                     custom_divisor; /* For special baudrates */
+        struct etrax_dma_descr  tr_descr;
+        struct etrax_dma_descr  rec_descr[SERIAL_RECV_DESCRIPTORS];
+        int                     cur_rec_descr;
+
+        volatile int            tr_running; /* 1 if output is running */
+
+        struct tty_struct       *tty;
+        int                     read_status_mask;
+        int                     ignore_status_mask;
+        int                     x_char; /* xon/xoff character */
+        int                     close_delay;
+        unsigned short          closing_wait;
+        unsigned short          closing_wait2;
+        unsigned long           event;
+        unsigned long           last_active;
+        int                     line;
+        int                     type;  /* PORT_ETRAX */
+        int                     count;      /* # of fd on device */
+        int                     blocked_open; /* # of blocked opens */
+        struct circ_buf         xmit;
+        struct etrax_recv_buffer *first_recv_buffer;
+        struct etrax_recv_buffer *last_recv_buffer;
+        unsigned int            recv_cnt;
+        unsigned int            max_recv_cnt;
+
+        struct work_struct      work;
+        struct async_icount     icount;   /* error-statistics etc.*/
+        struct ktermios         normal_termios;
+        struct ktermios         callout_termios;
+        wait_queue_head_t       open_wait;
+        wait_queue_head_t       close_wait;
+
+        unsigned long char_time_usec;       /* The time for 1 char, in usecs */
+        unsigned long flush_time_usec;      /* How often we should flush */
+        unsigned long last_tx_active_usec;  /* Last tx usec in the jiffies */
+        unsigned long last_tx_active;       /* Last tx time in jiffies */
+        unsigned long last_rx_active_usec;  /* Last rx usec in the jiffies */
+        unsigned long last_rx_active;       /* Last rx time in jiffies */
+
+        int break_detected_cnt;
+        int errorcode;
+
+#ifdef CONFIG_ETRAX_RS485
+        struct serial_rs485     rs485;  /* RS-485 support */
+#endif
+};
+
+/* this PORT is not in the standard serial.h. it's not actually used for
+ * anything since we only have one type of async serial-port anyway in this
+ * system.
+ */
+
+#define PORT_ETRAX 1
+
+/*
+ * Events are used to schedule things to happen at timer-interrupt
+ * time, instead of at rs interrupt time.
+ */
+#define RS_EVENT_WRITE_WAKEUP   0
+
+#endif /* __KERNEL__ */
+
+#endif /* !_ETRAX_SERIAL_H */
diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
new file mode 100644
index 000000000000..57421d776329
--- /dev/null
+++ b/drivers/tty/serial/dz.c
@@ -0,0 +1,955 @@
+/*
+ * dz.c: Serial port driver for DECstations equipped
+ *       with the DZ chipset.
+ *
+ * Copyright (C) 1998 Olivier A. D. Lebaillif
+ *
+ * Email: olivier.lebaillif@ifrsys.com
+ *
+ * Copyright (C) 2004, 2006, 2007  Maciej W. Rozycki
+ *
+ * [31-AUG-98] triemer
+ * Changed IRQ to use Harald's dec internals interrupts.h
+ * removed base_addr code - moving address assignment to setup.c
+ * Changed name of dz_init to rs_init to be consistent with tc code
+ * [13-NOV-98] triemer fixed code to receive characters
+ *    after patches by harald to irq code.
+ * [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
+ *            field from "current" - somewhere between 2.1.121 and 2.1.131
+ Qua Jun 27 15:02:26 BRT 2001
+ * [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
+ *
+ * Parts (C) 1999 David Airlie, airlied@linux.ie
+ * [07-SEP-99] Bugfixes
+ *
+ * [06-Jan-2002] Russell King <rmk@arm.linux.org.uk>
+ * Converted to new serial core
+ */
+
+#undef DEBUG_DZ
+
+#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/bitops.h>
+#include <linux/compiler.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/module.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+
+#include <asm/atomic.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/kn01.h>
+#include <asm/dec/kn02.h>
+#include <asm/dec/machtype.h>
+#include <asm/dec/prom.h>
+#include <asm/dec/system.h>
+
+#include "dz.h"
+
+
+MODULE_DESCRIPTION("DECstation DZ serial driver");
+MODULE_LICENSE("GPL");
+
+
+static char dz_name[] __initdata = "DECstation DZ serial driver version ";
+static char dz_version[] __initdata = "1.04";
+
+struct dz_port {
+        struct dz_mux           *mux;
+        struct uart_port        port;
+        unsigned int            cflag;
+};
+
+struct dz_mux {
+        struct dz_port          dport[DZ_NB_PORT];
+        atomic_t                map_guard;
+        atomic_t                irq_guard;
+        int                     initialised;
+};
+
+static struct dz_mux dz_mux;
+
+static inline struct dz_port *to_dport(struct uart_port *uport)
+{
+        return container_of(uport, struct dz_port, port);
+}
+
+/*
+ * ------------------------------------------------------------
+ * dz_in () and dz_out ()
+ *
+ * These routines are used to access the registers of the DZ
+ * chip, hiding relocation differences between implementation.
+ * ------------------------------------------------------------
+ */
+
+static u16 dz_in(struct dz_port *dport, unsigned offset)
+{
+        void __iomem *addr = dport->port.membase + offset;
+
+        return readw(addr);
+}
+
+static void dz_out(struct dz_port *dport, unsigned offset, u16 value)
+{
+        void __iomem *addr = dport->port.membase + offset;
+
+        writew(value, addr);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop () and rs_start ()
+ *
+ * These routines are called before setting or resetting
+ * tty->stopped. They enable or disable transmitter interrupts,
+ * as necessary.
+ * ------------------------------------------------------------
+ */
+
+static void dz_stop_tx(struct uart_port *uport)
+{
+        struct dz_port *dport = to_dport(uport);
+        u16 tmp, mask = 1 << dport->port.line;
+
+        tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
+        tmp &= ~mask;                   /* clear the TX flag */
+        dz_out(dport, DZ_TCR, tmp);
+}
+
+static void dz_start_tx(struct uart_port *uport)
+{
+        struct dz_port *dport = to_dport(uport);
+        u16 tmp, mask = 1 << dport->port.line;
+
+        tmp = dz_in(dport, DZ_TCR);     /* read the TX flag */
+        tmp |= mask;                    /* set the TX flag */
+        dz_out(dport, DZ_TCR, tmp);
+}
+
+static void dz_stop_rx(struct uart_port *uport)
+{
+        struct dz_port *dport = to_dport(uport);
+
+        dport->cflag &= ~DZ_RXENAB;
+        dz_out(dport, DZ_LPR, dport->cflag);
+}
+
+static void dz_enable_ms(struct uart_port *uport)
+{
+        /* nothing to do */
+}
+
+/*
+ * ------------------------------------------------------------
+ *
+ * Here start the interrupt handling routines.  All of the following
+ * subroutines are declared as inline and are folded into
+ * dz_interrupt.  They were separated out for readability's sake.
+ *
+ * Note: dz_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off.  People who may want to modify
+ * dz_interrupt() should try to keep the interrupt handler as fast as
+ * possible.  After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ *      make drivers/serial/dz.s
+ *
+ * and look at the resulting assemble code in dz.s.
+ *
+ * ------------------------------------------------------------
+ */
+
+/*
+ * ------------------------------------------------------------
+ * receive_char ()
+ *
+ * This routine deals with inputs from any lines.
+ * ------------------------------------------------------------
+ */
+static inline void dz_receive_chars(struct dz_mux *mux)
+{
+        struct uart_port *uport;
+        struct dz_port *dport = &mux->dport[0];
+        struct tty_struct *tty = NULL;
+        struct uart_icount *icount;
+        int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
+        unsigned char ch, flag;
+        u16 status;
+        int i;
+
+        while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
+                dport = &mux->dport[LINE(status)];
+                uport = &dport->port;
+                tty = uport->state->port.tty;   /* point to the proper dev */
+
+                ch = UCHAR(status);             /* grab the char */
+                flag = TTY_NORMAL;
+
+                icount = &uport->icount;
+                icount->rx++;
+
+                if (unlikely(status & (DZ_OERR | DZ_FERR | DZ_PERR))) {
+
+                        /*
+                         * There is no separate BREAK status bit, so treat
+                         * null characters with framing errors as BREAKs;
+                         * normally, otherwise.  For this move the Framing
+                         * Error bit to a simulated BREAK bit.
+                         */
+                        if (!ch) {
+                                status |= (status & DZ_FERR) >>
+                                          (ffs(DZ_FERR) - ffs(DZ_BREAK));
+                                status &= ~DZ_FERR;
+                        }
+
+                        /* Handle SysRq/SAK & keep track of the statistics. */
+                        if (status & DZ_BREAK) {
+                                icount->brk++;
+                                if (uart_handle_break(uport))
+                                        continue;
+                        } else if (status & DZ_FERR)
+                                icount->frame++;
+                        else if (status & DZ_PERR)
+                                icount->parity++;
+                        if (status & DZ_OERR)
+                                icount->overrun++;
+
+                        status &= uport->read_status_mask;
+                        if (status & DZ_BREAK)
+                                flag = TTY_BREAK;
+                        else if (status & DZ_FERR)
+                                flag = TTY_FRAME;
+                        else if (status & DZ_PERR)
+                                flag = TTY_PARITY;
+
+                }
+
+                if (uart_handle_sysrq_char(uport, ch))
+                        continue;
+
+                uart_insert_char(uport, status, DZ_OERR, ch, flag);
+                lines_rx[LINE(status)] = 1;
+        }
+        for (i = 0; i < DZ_NB_PORT; i++)
+                if (lines_rx[i])
+                        tty_flip_buffer_push(mux->dport[i].port.state->port.tty);
+}
+
+/*
+ * ------------------------------------------------------------
+ * transmit_char ()
+ *
+ * This routine deals with outputs to any lines.
+ * ------------------------------------------------------------
+ */
+static inline void dz_transmit_chars(struct dz_mux *mux)
+{
+        struct dz_port *dport = &mux->dport[0];
+        struct circ_buf *xmit;
+        unsigned char tmp;
+        u16 status;
+
+        status = dz_in(dport, DZ_CSR);
+        dport = &mux->dport[LINE(status)];
+        xmit = &dport->port.state->xmit;
+
+        if (dport->port.x_char) {               /* XON/XOFF chars */
+                dz_out(dport, DZ_TDR, dport->port.x_char);
+                dport->port.icount.tx++;
+                dport->port.x_char = 0;
+                return;
+        }
+        /* If nothing to do or stopped or hardware stopped. */
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
+                spin_lock(&dport->port.lock);
+                dz_stop_tx(&dport->port);
+                spin_unlock(&dport->port.lock);
+                return;
+        }
+
+        /*
+         * If something to do... (remember the dz has no output fifo,
+         * so we go one char at a time) :-<
+         */
+        tmp = xmit->buf[xmit->tail];
+        xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
+        dz_out(dport, DZ_TDR, tmp);
+        dport->port.icount.tx++;
+
+        if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
+                uart_write_wakeup(&dport->port);
+
+        /* Are we are done. */
+        if (uart_circ_empty(xmit)) {
+                spin_lock(&dport->port.lock);
+                dz_stop_tx(&dport->port);
+                spin_unlock(&dport->port.lock);
+        }
+}
+
+/*
+ * ------------------------------------------------------------
+ * check_modem_status()
+ *
+ * DS 3100 & 5100: Only valid for the MODEM line, duh!
+ * DS 5000/200: Valid for the MODEM and PRINTER line.
+ * ------------------------------------------------------------
+ */
+static inline void check_modem_status(struct dz_port *dport)
+{
+        /*
+         * FIXME:
+         * 1. No status change interrupt; use a timer.
+         * 2. Handle the 3100/5000 as appropriate. --macro
+         */
+        u16 status;
+
+        /* If not the modem line just return.  */
+        if (dport->port.line != DZ_MODEM)
+                return;
+
+        status = dz_in(dport, DZ_MSR);
+
+        /* it's easy, since DSR2 is the only bit in the register */
+        if (status)
+                dport->port.icount.dsr++;
+}
+
+/*
+ * ------------------------------------------------------------
+ * dz_interrupt ()
+ *
+ * this is the main interrupt routine for the DZ chip.
+ * It deals with the multiple ports.
+ * ------------------------------------------------------------
+ */
+static irqreturn_t dz_interrupt(int irq, void *dev_id)
+{
+        struct dz_mux *mux = dev_id;
+        struct dz_port *dport = &mux->dport[0];
+        u16 status;
+
+        /* get the reason why we just got an irq */
+        status = dz_in(dport, DZ_CSR);
+
+        if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE))
+                dz_receive_chars(mux);
+
+        if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE))
+                dz_transmit_chars(mux);
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the DZ interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+static unsigned int dz_get_mctrl(struct uart_port *uport)
+{
+        /*
+         * FIXME: Handle the 3100/5000 as appropriate. --macro
+         */
+        struct dz_port *dport = to_dport(uport);
+        unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+
+        if (dport->port.line == DZ_MODEM) {
+                if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
+                        mctrl &= ~TIOCM_DSR;
+        }
+
+        return mctrl;
+}
+
+static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
+{
+        /*
+         * FIXME: Handle the 3100/5000 as appropriate. --macro
+         */
+        struct dz_port *dport = to_dport(uport);
+        u16 tmp;
+
+        if (dport->port.line == DZ_MODEM) {
+                tmp = dz_in(dport, DZ_TCR);
+                if (mctrl & TIOCM_DTR)
+                        tmp &= ~DZ_MODEM_DTR;
+                else
+                        tmp |= DZ_MODEM_DTR;
+                dz_out(dport, DZ_TCR, tmp);
+        }
+}
+
+/*
+ * -------------------------------------------------------------------
+ * startup ()
+ *
+ * various initialization tasks
+ * -------------------------------------------------------------------
+ */
+static int dz_startup(struct uart_port *uport)
+{
+        struct dz_port *dport = to_dport(uport);
+        struct dz_mux *mux = dport->mux;
+        unsigned long flags;
+        int irq_guard;
+        int ret;
+        u16 tmp;
+
+        irq_guard = atomic_add_return(1, &mux->irq_guard);
+        if (irq_guard != 1)
+                return 0;
+
+        ret = request_irq(dport->port.irq, dz_interrupt,
+                          IRQF_SHARED, "dz", mux);
+        if (ret) {
+                atomic_add(-1, &mux->irq_guard);
+                printk(KERN_ERR "dz: Cannot get IRQ %d!\n", dport->port.irq);
+                return ret;
+        }
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+
+        /* Enable interrupts.  */
+        tmp = dz_in(dport, DZ_CSR);
+        tmp |= DZ_RIE | DZ_TIE;
+        dz_out(dport, DZ_CSR, tmp);
+
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+
+        return 0;
+}
+
+/*
+ * -------------------------------------------------------------------
+ * shutdown ()
+ *
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ * -------------------------------------------------------------------
+ */
+static void dz_shutdown(struct uart_port *uport)
+{
+        struct dz_port *dport = to_dport(uport);
+        struct dz_mux *mux = dport->mux;
+        unsigned long flags;
+        int irq_guard;
+        u16 tmp;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+        dz_stop_tx(&dport->port);
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+
+        irq_guard = atomic_add_return(-1, &mux->irq_guard);
+        if (!irq_guard) {
+                /* Disable interrupts.  */
+                tmp = dz_in(dport, DZ_CSR);
+                tmp &= ~(DZ_RIE | DZ_TIE);
+                dz_out(dport, DZ_CSR, tmp);
+
+                free_irq(dport->port.irq, mux);
+        }
+}
+
+/*
+ * -------------------------------------------------------------------
+ * dz_tx_empty() -- get the transmitter empty status
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting. This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space.
+ * -------------------------------------------------------------------
+ */
+static unsigned int dz_tx_empty(struct uart_port *uport)
+{
+        struct dz_port *dport = to_dport(uport);
+        unsigned short tmp, mask = 1 << dport->port.line;
+
+        tmp = dz_in(dport, DZ_TCR);
+        tmp &= mask;
+
+        return tmp ? 0 : TIOCSER_TEMT;
+}
+
+static void dz_break_ctl(struct uart_port *uport, int break_state)
+{
+        /*
+         * FIXME: Can't access BREAK bits in TDR easily;
+         * reuse the code for polled TX. --macro
+         */
+        struct dz_port *dport = to_dport(uport);
+        unsigned long flags;
+        unsigned short tmp, mask = 1 << dport->port.line;
+
+        spin_lock_irqsave(&uport->lock, flags);
+        tmp = dz_in(dport, DZ_TCR);
+        if (break_state)
+                tmp |= mask;
+        else
+                tmp &= ~mask;
+        dz_out(dport, DZ_TCR, tmp);
+        spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+static int dz_encode_baud_rate(unsigned int baud)
+{
+        switch (baud) {
+        case 50:
+                return DZ_B50;
+        case 75:
+                return DZ_B75;
+        case 110:
+                return DZ_B110;
+        case 134:
+                return DZ_B134;
+        case 150:
+                return DZ_B150;
+        case 300:
+                return DZ_B300;
+        case 600:
+                return DZ_B600;
+        case 1200:
+                return DZ_B1200;
+        case 1800:
+                return DZ_B1800;
+        case 2000:
+                return DZ_B2000;
+        case 2400:
+                return DZ_B2400;
+        case 3600:
+                return DZ_B3600;
+        case 4800:
+                return DZ_B4800;
+        case 7200:
+                return DZ_B7200;
+        case 9600:
+                return DZ_B9600;
+        default:
+                return -1;
+        }
+}
+
+
+static void dz_reset(struct dz_port *dport)
+{
+        struct dz_mux *mux = dport->mux;
+
+        if (mux->initialised)
+                return;
+
+        dz_out(dport, DZ_CSR, DZ_CLR);
+        while (dz_in(dport, DZ_CSR) & DZ_CLR);
+        iob();
+
+        /* Enable scanning.  */
+        dz_out(dport, DZ_CSR, DZ_MSE);
+
+        mux->initialised = 1;
+}
+
+static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
+                           struct ktermios *old_termios)
+{
+        struct dz_port *dport = to_dport(uport);
+        unsigned long flags;
+        unsigned int cflag, baud;
+        int bflag;
+
+        cflag = dport->port.line;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                cflag |= DZ_CS5;
+                break;
+        case CS6:
+                cflag |= DZ_CS6;
+                break;
+        case CS7:
+                cflag |= DZ_CS7;
+                break;
+        case CS8:
+        default:
+                cflag |= DZ_CS8;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                cflag |= DZ_CSTOPB;
+        if (termios->c_cflag & PARENB)
+                cflag |= DZ_PARENB;
+        if (termios->c_cflag & PARODD)
+                cflag |= DZ_PARODD;
+
+        baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
+        bflag = dz_encode_baud_rate(baud);
+        if (bflag < 0)  {                       /* Try to keep unchanged.  */
+                baud = uart_get_baud_rate(uport, old_termios, NULL, 50, 9600);
+                bflag = dz_encode_baud_rate(baud);
+                if (bflag < 0)  {               /* Resort to 9600.  */
+                        baud = 9600;
+                        bflag = DZ_B9600;
+                }
+                tty_termios_encode_baud_rate(termios, baud, baud);
+        }
+        cflag |= bflag;
+
+        if (termios->c_cflag & CREAD)
+                cflag |= DZ_RXENAB;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+
+        uart_update_timeout(uport, termios->c_cflag, baud);
+
+        dz_out(dport, DZ_LPR, cflag);
+        dport->cflag = cflag;
+
+        /* setup accept flag */
+        dport->port.read_status_mask = DZ_OERR;
+        if (termios->c_iflag & INPCK)
+                dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                dport->port.read_status_mask |= DZ_BREAK;
+
+        /* characters to ignore */
+        uport->ignore_status_mask = 0;
+        if ((termios->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
+                dport->port.ignore_status_mask |= DZ_OERR;
+        if (termios->c_iflag & IGNPAR)
+                dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
+        if (termios->c_iflag & IGNBRK)
+                dport->port.ignore_status_mask |= DZ_BREAK;
+
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+}
+
+/*
+ * Hack alert!
+ * Required solely so that the initial PROM-based console
+ * works undisturbed in parallel with this one.
+ */
+static void dz_pm(struct uart_port *uport, unsigned int state,
+                  unsigned int oldstate)
+{
+        struct dz_port *dport = to_dport(uport);
+        unsigned long flags;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+        if (state < 3)
+                dz_start_tx(&dport->port);
+        else
+                dz_stop_tx(&dport->port);
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+}
+
+
+static const char *dz_type(struct uart_port *uport)
+{
+        return "DZ";
+}
+
+static void dz_release_port(struct uart_port *uport)
+{
+        struct dz_mux *mux = to_dport(uport)->mux;
+        int map_guard;
+
+        iounmap(uport->membase);
+        uport->membase = NULL;
+
+        map_guard = atomic_add_return(-1, &mux->map_guard);
+        if (!map_guard)
+                release_mem_region(uport->mapbase, dec_kn_slot_size);
+}
+
+static int dz_map_port(struct uart_port *uport)
+{
+        if (!uport->membase)
+                uport->membase = ioremap_nocache(uport->mapbase,
+                                                 dec_kn_slot_size);
+        if (!uport->membase) {
+                printk(KERN_ERR "dz: Cannot map MMIO\n");
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static int dz_request_port(struct uart_port *uport)
+{
+        struct dz_mux *mux = to_dport(uport)->mux;
+        int map_guard;
+        int ret;
+
+        map_guard = atomic_add_return(1, &mux->map_guard);
+        if (map_guard == 1) {
+                if (!request_mem_region(uport->mapbase, dec_kn_slot_size,
+                                        "dz")) {
+                        atomic_add(-1, &mux->map_guard);
+                        printk(KERN_ERR
+                               "dz: Unable to reserve MMIO resource\n");
+                        return -EBUSY;
+                }
+        }
+        ret = dz_map_port(uport);
+        if (ret) {
+                map_guard = atomic_add_return(-1, &mux->map_guard);
+                if (!map_guard)
+                        release_mem_region(uport->mapbase, dec_kn_slot_size);
+                return ret;
+        }
+        return 0;
+}
+
+static void dz_config_port(struct uart_port *uport, int flags)
+{
+        struct dz_port *dport = to_dport(uport);
+
+        if (flags & UART_CONFIG_TYPE) {
+                if (dz_request_port(uport))
+                        return;
+
+                uport->type = PORT_DZ;
+
+                dz_reset(dport);
+        }
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int dz_verify_port(struct uart_port *uport, struct serial_struct *ser)
+{
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
+                ret = -EINVAL;
+        if (ser->irq != uport->irq)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops dz_ops = {
+        .tx_empty       = dz_tx_empty,
+        .get_mctrl      = dz_get_mctrl,
+        .set_mctrl      = dz_set_mctrl,
+        .stop_tx        = dz_stop_tx,
+        .start_tx       = dz_start_tx,
+        .stop_rx        = dz_stop_rx,
+        .enable_ms      = dz_enable_ms,
+        .break_ctl      = dz_break_ctl,
+        .startup        = dz_startup,
+        .shutdown       = dz_shutdown,
+        .set_termios    = dz_set_termios,
+        .pm             = dz_pm,
+        .type           = dz_type,
+        .release_port   = dz_release_port,
+        .request_port   = dz_request_port,
+        .config_port    = dz_config_port,
+        .verify_port    = dz_verify_port,
+};
+
+static void __init dz_init_ports(void)
+{
+        static int first = 1;
+        unsigned long base;
+        int line;
+
+        if (!first)
+                return;
+        first = 0;
+
+        if (mips_machtype == MACH_DS23100 || mips_machtype == MACH_DS5100)
+                base = dec_kn_slot_base + KN01_DZ11;
+        else
+                base = dec_kn_slot_base + KN02_DZ11;
+
+        for (line = 0; line < DZ_NB_PORT; line++) {
+                struct dz_port *dport = &dz_mux.dport[line];
+                struct uart_port *uport = &dport->port;
+
+                dport->mux      = &dz_mux;
+
+                uport->irq      = dec_interrupt[DEC_IRQ_DZ11];
+                uport->fifosize = 1;
+                uport->iotype   = UPIO_MEM;
+                uport->flags    = UPF_BOOT_AUTOCONF;
+                uport->ops      = &dz_ops;
+                uport->line     = line;
+                uport->mapbase  = base;
+        }
+}
+
+#ifdef CONFIG_SERIAL_DZ_CONSOLE
+/*
+ * -------------------------------------------------------------------
+ * dz_console_putchar() -- transmit a character
+ *
+ * Polled transmission.  This is tricky.  We need to mask transmit
+ * interrupts so that they do not interfere, enable the transmitter
+ * for the line requested and then wait till the transmit scanner
+ * requests data for this line.  But it may request data for another
+ * line first, in which case we have to disable its transmitter and
+ * repeat waiting till our line pops up.  Only then the character may
+ * be transmitted.  Finally, the state of the transmitter mask is
+ * restored.  Welcome to the world of PDP-11!
+ * -------------------------------------------------------------------
+ */
+static void dz_console_putchar(struct uart_port *uport, int ch)
+{
+        struct dz_port *dport = to_dport(uport);
+        unsigned long flags;
+        unsigned short csr, tcr, trdy, mask;
+        int loops = 10000;
+
+        spin_lock_irqsave(&dport->port.lock, flags);
+        csr = dz_in(dport, DZ_CSR);
+        dz_out(dport, DZ_CSR, csr & ~DZ_TIE);
+        tcr = dz_in(dport, DZ_TCR);
+        tcr |= 1 << dport->port.line;
+        mask = tcr;
+        dz_out(dport, DZ_TCR, mask);
+        iob();
+        spin_unlock_irqrestore(&dport->port.lock, flags);
+
+        do {
+                trdy = dz_in(dport, DZ_CSR);
+                if (!(trdy & DZ_TRDY))
+                        continue;
+                trdy = (trdy & DZ_TLINE) >> 8;
+                if (trdy == dport->port.line)
+                        break;
+                mask &= ~(1 << trdy);
+                dz_out(dport, DZ_TCR, mask);
+                iob();
+                udelay(2);
+        } while (--loops);
+
+        if (loops)                              /* Cannot send otherwise. */
+                dz_out(dport, DZ_TDR, ch);
+
+        dz_out(dport, DZ_TCR, tcr);
+        dz_out(dport, DZ_CSR, csr);
+}
+
+/*
+ * -------------------------------------------------------------------
+ * dz_console_print ()
+ *
+ * dz_console_print is registered for printk.
+ * The console must be locked when we get here.
+ * -------------------------------------------------------------------
+ */
+static void dz_console_print(struct console *co,
+                             const char *str,
+                             unsigned int count)
+{
+        struct dz_port *dport = &dz_mux.dport[co->index];
+#ifdef DEBUG_DZ
+        prom_printf((char *) str);
+#endif
+        uart_console_write(&dport->port, str, count, dz_console_putchar);
+}
+
+static int __init dz_console_setup(struct console *co, char *options)
+{
+        struct dz_port *dport = &dz_mux.dport[co->index];
+        struct uart_port *uport = &dport->port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+
+        ret = dz_map_port(uport);
+        if (ret)
+                return ret;
+
+        spin_lock_init(&dport->port.lock);      /* For dz_pm().  */
+
+        dz_reset(dport);
+        dz_pm(uport, 0, -1);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&dport->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver dz_reg;
+static struct console dz_console = {
+        .name   = "ttyS",
+        .write  = dz_console_print,
+        .device = uart_console_device,
+        .setup  = dz_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+        .data   = &dz_reg,
+};
+
+static int __init dz_serial_console_init(void)
+{
+        if (!IOASIC) {
+                dz_init_ports();
+                register_console(&dz_console);
+                return 0;
+        } else
+                return -ENXIO;
+}
+
+console_initcall(dz_serial_console_init);
+
+#define SERIAL_DZ_CONSOLE       &dz_console
+#else
+#define SERIAL_DZ_CONSOLE       NULL
+#endif /* CONFIG_SERIAL_DZ_CONSOLE */
+
+static struct uart_driver dz_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "serial",
+        .dev_name               = "ttyS",
+        .major                  = TTY_MAJOR,
+        .minor                  = 64,
+        .nr                     = DZ_NB_PORT,
+        .cons                   = SERIAL_DZ_CONSOLE,
+};
+
+static int __init dz_init(void)
+{
+        int ret, i;
+
+        if (IOASIC)
+                return -ENXIO;
+
+        printk("%s%s\n", dz_name, dz_version);
+
+        dz_init_ports();
+
+        ret = uart_register_driver(&dz_reg);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < DZ_NB_PORT; i++)
+                uart_add_one_port(&dz_reg, &dz_mux.dport[i].port);
+
+        return 0;
+}
+
+module_init(dz_init);
diff --git a/drivers/tty/serial/dz.h b/drivers/tty/serial/dz.h
new file mode 100644
index 000000000000..faf169ed27b3
--- /dev/null
+++ b/drivers/tty/serial/dz.h
@@ -0,0 +1,129 @@
+/*
+ * dz.h: Serial port driver for DECstations equipped
+ *       with the DZ chipset.
+ *
+ * Copyright (C) 1998 Olivier A. D. Lebaillif 
+ *             
+ * Email: olivier.lebaillif@ifrsys.com
+ *
+ * Copyright (C) 2004, 2006  Maciej W. Rozycki
+ */
+#ifndef DZ_SERIAL_H
+#define DZ_SERIAL_H
+
+/*
+ * Definitions for the Control and Status Register.
+ */
+#define DZ_TRDY        0x8000                 /* Transmitter empty */
+#define DZ_TIE         0x4000                 /* Transmitter Interrupt Enbl */
+#define DZ_TLINE       0x0300                 /* Transmitter Line Number */
+#define DZ_RDONE       0x0080                 /* Receiver data ready */
+#define DZ_RIE         0x0040                 /* Receive Interrupt Enable */
+#define DZ_MSE         0x0020                 /* Master Scan Enable */
+#define DZ_CLR         0x0010                 /* Master reset */
+#define DZ_MAINT       0x0008                 /* Loop Back Mode */
+
+/*
+ * Definitions for the Receiver Buffer Register.
+ */
+#define DZ_RBUF_MASK   0x00FF                 /* Data Mask */
+#define DZ_LINE_MASK   0x0300                 /* Line Mask */
+#define DZ_DVAL        0x8000                 /* Valid Data indicator */
+#define DZ_OERR        0x4000                 /* Overrun error indicator */
+#define DZ_FERR        0x2000                 /* Frame error indicator */
+#define DZ_PERR        0x1000                 /* Parity error indicator */
+
+#define DZ_BREAK       0x0800                 /* BREAK event software flag */
+
+#define LINE(x) ((x & DZ_LINE_MASK) >> 8)     /* Get the line number
+                                                 from the input buffer */
+#define UCHAR(x) ((unsigned char)(x & DZ_RBUF_MASK))
+
+/*
+ * Definitions for the Transmit Control Register.
+ */
+#define DZ_LINE_KEYBOARD 0x0001
+#define DZ_LINE_MOUSE    0x0002
+#define DZ_LINE_MODEM    0x0004
+#define DZ_LINE_PRINTER  0x0008
+
+#define DZ_MODEM_RTS     0x0800               /* RTS for the modem line (2) */
+#define DZ_MODEM_DTR     0x0400               /* DTR for the modem line (2) */
+#define DZ_PRINT_RTS     0x0200               /* RTS for the prntr line (3) */
+#define DZ_PRINT_DTR     0x0100               /* DTR for the prntr line (3) */
+#define DZ_LNENB         0x000f               /* Transmitter Line Enable */
+
+/*
+ * Definitions for the Modem Status Register.
+ */
+#define DZ_MODEM_RI      0x0800               /* RI for the modem line (2) */
+#define DZ_MODEM_CD      0x0400               /* CD for the modem line (2) */
+#define DZ_MODEM_DSR     0x0200               /* DSR for the modem line (2) */
+#define DZ_MODEM_CTS     0x0100               /* CTS for the modem line (2) */
+#define DZ_PRINT_RI      0x0008               /* RI for the printer line (3) */
+#define DZ_PRINT_CD      0x0004               /* CD for the printer line (3) */
+#define DZ_PRINT_DSR     0x0002               /* DSR for the prntr line (3) */
+#define DZ_PRINT_CTS     0x0001               /* CTS for the prntr line (3) */
+
+/*
+ * Definitions for the Transmit Data Register.
+ */
+#define DZ_BRK0          0x0100               /* Break assertion for line 0 */
+#define DZ_BRK1          0x0200               /* Break assertion for line 1 */
+#define DZ_BRK2          0x0400               /* Break assertion for line 2 */
+#define DZ_BRK3          0x0800               /* Break assertion for line 3 */
+
+/*
+ * Definitions for the Line Parameter Register.
+ */
+#define DZ_KEYBOARD      0x0000               /* line 0 = keyboard */
+#define DZ_MOUSE         0x0001               /* line 1 = mouse */
+#define DZ_MODEM         0x0002               /* line 2 = modem */
+#define DZ_PRINTER       0x0003               /* line 3 = printer */
+
+#define DZ_CSIZE         0x0018               /* Number of bits per byte (mask) */
+#define DZ_CS5           0x0000               /* 5 bits per byte */
+#define DZ_CS6           0x0008               /* 6 bits per byte */
+#define DZ_CS7           0x0010               /* 7 bits per byte */
+#define DZ_CS8           0x0018               /* 8 bits per byte */
+
+#define DZ_CSTOPB        0x0020               /* 2 stop bits instead of one */ 
+
+#define DZ_PARENB        0x0040               /* Parity enable */
+#define DZ_PARODD        0x0080               /* Odd parity instead of even */
+
+#define DZ_CBAUD         0x0E00               /* Baud Rate (mask) */
+#define DZ_B50           0x0000
+#define DZ_B75           0x0100
+#define DZ_B110          0x0200
+#define DZ_B134          0x0300
+#define DZ_B150          0x0400
+#define DZ_B300          0x0500
+#define DZ_B600          0x0600
+#define DZ_B1200         0x0700 
+#define DZ_B1800         0x0800
+#define DZ_B2000         0x0900
+#define DZ_B2400         0x0A00
+#define DZ_B3600         0x0B00
+#define DZ_B4800         0x0C00
+#define DZ_B7200         0x0D00
+#define DZ_B9600         0x0E00
+
+#define DZ_RXENAB        0x1000               /* Receiver Enable */
+
+/*
+ * Addresses for the DZ registers
+ */
+#define DZ_CSR       0x00            /* Control and Status Register */
+#define DZ_RBUF      0x08            /* Receive Buffer */
+#define DZ_LPR       0x08            /* Line Parameters Register */
+#define DZ_TCR       0x10            /* Transmitter Control Register */
+#define DZ_MSR       0x18            /* Modem Status Register */
+#define DZ_TDR       0x18            /* Transmit Data Register */
+
+#define DZ_NB_PORT 4
+
+#define DZ_XMIT_SIZE   4096                 /* buffer size */
+#define DZ_WAKEUP_CHARS   DZ_XMIT_SIZE/4
+
+#endif /* DZ_SERIAL_H */
diff --git a/drivers/tty/serial/icom.c b/drivers/tty/serial/icom.c
new file mode 100644
index 000000000000..8a869e58f6d7
--- /dev/null
+++ b/drivers/tty/serial/icom.c
@@ -0,0 +1,1658 @@
+/*
+  * icom.c
+  *
+  * Copyright (C) 2001 IBM Corporation. All rights reserved.
+  *
+  * Serial device driver.
+  *
+  * Based on code from serial.c
+  *
+  * This program is free software; you can redistribute it and/or modify
+  * it under the terms of the GNU General Public License as published by
+  * the Free Software Foundation; either version 2 of the License, or
+  * (at your option) any later version.
+  *
+  * This program is distributed in the hope that it will be useful,
+  * but WITHOUT ANY WARRANTY; without even the implied warranty of
+  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  * GNU General Public License for more details.
+  *
+  * You should have received a copy of the GNU General Public License
+  * along with this program; if not, write to the Free Software
+  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+  *
+  */
+#define SERIAL_DO_RESTART
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/termios.h>
+#include <linux/fs.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/vmalloc.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/kref.h>
+#include <linux/firmware.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#include "icom.h"
+
+/*#define ICOM_TRACE             enable port trace capabilities */
+
+#define ICOM_DRIVER_NAME "icom"
+#define ICOM_VERSION_STR "1.3.1"
+#define NR_PORTS               128
+#define ICOM_PORT ((struct icom_port *)port)
+#define to_icom_adapter(d) container_of(d, struct icom_adapter, kref)
+
+static const struct pci_device_id icom_pci_table[] = {
+        {
+                .vendor = PCI_VENDOR_ID_IBM,
+                .device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_1,
+                .subvendor = PCI_ANY_ID,
+                .subdevice = PCI_ANY_ID,
+                .driver_data = ADAPTER_V1,
+        },
+        {
+                .vendor = PCI_VENDOR_ID_IBM,
+                .device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,
+                .subvendor = PCI_VENDOR_ID_IBM,
+                .subdevice = PCI_DEVICE_ID_IBM_ICOM_V2_TWO_PORTS_RVX,
+                .driver_data = ADAPTER_V2,
+        },
+        {
+                .vendor = PCI_VENDOR_ID_IBM,
+                .device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,
+                .subvendor = PCI_VENDOR_ID_IBM,
+                .subdevice = PCI_DEVICE_ID_IBM_ICOM_V2_ONE_PORT_RVX_ONE_PORT_MDM,
+                .driver_data = ADAPTER_V2,
+        },
+        {
+                .vendor = PCI_VENDOR_ID_IBM,
+                .device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,
+                .subvendor = PCI_VENDOR_ID_IBM,
+                .subdevice = PCI_DEVICE_ID_IBM_ICOM_FOUR_PORT_MODEL,
+                .driver_data = ADAPTER_V2,
+        },
+        {
+                .vendor = PCI_VENDOR_ID_IBM,
+                .device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,
+                .subvendor = PCI_VENDOR_ID_IBM,
+                .subdevice = PCI_DEVICE_ID_IBM_ICOM_V2_ONE_PORT_RVX_ONE_PORT_MDM_PCIE,
+                .driver_data = ADAPTER_V2,
+        },
+        {}
+};
+
+struct lookup_proc_table start_proc[4] = {
+        {NULL, ICOM_CONTROL_START_A},
+        {NULL, ICOM_CONTROL_START_B},
+        {NULL, ICOM_CONTROL_START_C},
+        {NULL, ICOM_CONTROL_START_D}
+};
+
+
+struct lookup_proc_table stop_proc[4] = {
+        {NULL, ICOM_CONTROL_STOP_A},
+        {NULL, ICOM_CONTROL_STOP_B},
+        {NULL, ICOM_CONTROL_STOP_C},
+        {NULL, ICOM_CONTROL_STOP_D}
+};
+
+struct lookup_int_table int_mask_tbl[4] = {
+        {NULL, ICOM_INT_MASK_PRC_A},
+        {NULL, ICOM_INT_MASK_PRC_B},
+        {NULL, ICOM_INT_MASK_PRC_C},
+        {NULL, ICOM_INT_MASK_PRC_D},
+};
+
+
+MODULE_DEVICE_TABLE(pci, icom_pci_table);
+
+static LIST_HEAD(icom_adapter_head);
+
+/* spinlock for adapter initialization and changing adapter operations */
+static spinlock_t icom_lock;
+
+#ifdef ICOM_TRACE
+static inline void trace(struct icom_port *icom_port, char *trace_pt,
+                        unsigned long trace_data)
+{
+        dev_info(&icom_port->adapter->pci_dev->dev, ":%d:%s - %lx\n",
+        icom_port->port, trace_pt, trace_data);
+}
+#else
+static inline void trace(struct icom_port *icom_port, char *trace_pt, unsigned long trace_data) {};
+#endif
+static void icom_kref_release(struct kref *kref);
+
+static void free_port_memory(struct icom_port *icom_port)
+{
+        struct pci_dev *dev = icom_port->adapter->pci_dev;
+
+        trace(icom_port, "RET_PORT_MEM", 0);
+        if (icom_port->recv_buf) {
+                pci_free_consistent(dev, 4096, icom_port->recv_buf,
+                                    icom_port->recv_buf_pci);
+                icom_port->recv_buf = NULL;
+        }
+        if (icom_port->xmit_buf) {
+                pci_free_consistent(dev, 4096, icom_port->xmit_buf,
+                                    icom_port->xmit_buf_pci);
+                icom_port->xmit_buf = NULL;
+        }
+        if (icom_port->statStg) {
+                pci_free_consistent(dev, 4096, icom_port->statStg,
+                                    icom_port->statStg_pci);
+                icom_port->statStg = NULL;
+        }
+
+        if (icom_port->xmitRestart) {
+                pci_free_consistent(dev, 4096, icom_port->xmitRestart,
+                                    icom_port->xmitRestart_pci);
+                icom_port->xmitRestart = NULL;
+        }
+}
+
+static int __devinit get_port_memory(struct icom_port *icom_port)
+{
+        int index;
+        unsigned long stgAddr;
+        unsigned long startStgAddr;
+        unsigned long offset;
+        struct pci_dev *dev = icom_port->adapter->pci_dev;
+
+        icom_port->xmit_buf =
+            pci_alloc_consistent(dev, 4096, &icom_port->xmit_buf_pci);
+        if (!icom_port->xmit_buf) {
+                dev_err(&dev->dev, "Can not allocate Transmit buffer\n");
+                return -ENOMEM;
+        }
+
+        trace(icom_port, "GET_PORT_MEM",
+              (unsigned long) icom_port->xmit_buf);
+
+        icom_port->recv_buf =
+            pci_alloc_consistent(dev, 4096, &icom_port->recv_buf_pci);
+        if (!icom_port->recv_buf) {
+                dev_err(&dev->dev, "Can not allocate Receive buffer\n");
+                free_port_memory(icom_port);
+                return -ENOMEM;
+        }
+        trace(icom_port, "GET_PORT_MEM",
+              (unsigned long) icom_port->recv_buf);
+
+        icom_port->statStg =
+            pci_alloc_consistent(dev, 4096, &icom_port->statStg_pci);
+        if (!icom_port->statStg) {
+                dev_err(&dev->dev, "Can not allocate Status buffer\n");
+                free_port_memory(icom_port);
+                return -ENOMEM;
+        }
+        trace(icom_port, "GET_PORT_MEM",
+              (unsigned long) icom_port->statStg);
+
+        icom_port->xmitRestart =
+            pci_alloc_consistent(dev, 4096, &icom_port->xmitRestart_pci);
+        if (!icom_port->xmitRestart) {
+                dev_err(&dev->dev,
+                        "Can not allocate xmit Restart buffer\n");
+                free_port_memory(icom_port);
+                return -ENOMEM;
+        }
+
+        memset(icom_port->statStg, 0, 4096);
+
+        /* FODs: Frame Out Descriptor Queue, this is a FIFO queue that
+           indicates that frames are to be transmitted
+        */
+
+        stgAddr = (unsigned long) icom_port->statStg;
+        for (index = 0; index < NUM_XBUFFS; index++) {
+                trace(icom_port, "FOD_ADDR", stgAddr);
+                stgAddr = stgAddr + sizeof(icom_port->statStg->xmit[0]);
+                if (index < (NUM_XBUFFS - 1)) {
+                        memset(&icom_port->statStg->xmit[index], 0, sizeof(struct xmit_status_area));
+                        icom_port->statStg->xmit[index].leLengthASD =
+                            (unsigned short int) cpu_to_le16(XMIT_BUFF_SZ);
+                        trace(icom_port, "FOD_ADDR", stgAddr);
+                        trace(icom_port, "FOD_XBUFF",
+                              (unsigned long) icom_port->xmit_buf);
+                        icom_port->statStg->xmit[index].leBuffer =
+                            cpu_to_le32(icom_port->xmit_buf_pci);
+                } else if (index == (NUM_XBUFFS - 1)) {
+                        memset(&icom_port->statStg->xmit[index], 0, sizeof(struct xmit_status_area));
+                        icom_port->statStg->xmit[index].leLengthASD =
+                            (unsigned short int) cpu_to_le16(XMIT_BUFF_SZ);
+                        trace(icom_port, "FOD_XBUFF",
+                              (unsigned long) icom_port->xmit_buf);
+                        icom_port->statStg->xmit[index].leBuffer =
+                            cpu_to_le32(icom_port->xmit_buf_pci);
+                } else {
+                        memset(&icom_port->statStg->xmit[index], 0, sizeof(struct xmit_status_area));
+                }
+        }
+        /* FIDs */
+        startStgAddr = stgAddr;
+
+        /* fill in every entry, even if no buffer */
+        for (index = 0; index <  NUM_RBUFFS; index++) {
+                trace(icom_port, "FID_ADDR", stgAddr);
+                stgAddr = stgAddr + sizeof(icom_port->statStg->rcv[0]);
+                icom_port->statStg->rcv[index].leLength = 0;
+                icom_port->statStg->rcv[index].WorkingLength =
+                    (unsigned short int) cpu_to_le16(RCV_BUFF_SZ);
+                if (index < (NUM_RBUFFS - 1) ) {
+                        offset = stgAddr - (unsigned long) icom_port->statStg;
+                        icom_port->statStg->rcv[index].leNext =
+                              cpu_to_le32(icom_port-> statStg_pci + offset);
+                        trace(icom_port, "FID_RBUFF",
+                              (unsigned long) icom_port->recv_buf);
+                        icom_port->statStg->rcv[index].leBuffer =
+                            cpu_to_le32(icom_port->recv_buf_pci);
+                } else if (index == (NUM_RBUFFS -1) ) {
+                        offset = startStgAddr - (unsigned long) icom_port->statStg;
+                        icom_port->statStg->rcv[index].leNext =
+                            cpu_to_le32(icom_port-> statStg_pci + offset);
+                        trace(icom_port, "FID_RBUFF",
+                              (unsigned long) icom_port->recv_buf + 2048);
+                        icom_port->statStg->rcv[index].leBuffer =
+                            cpu_to_le32(icom_port->recv_buf_pci + 2048);
+                } else {
+                        icom_port->statStg->rcv[index].leNext = 0;
+                        icom_port->statStg->rcv[index].leBuffer = 0;
+                }
+        }
+
+        return 0;
+}
+
+static void stop_processor(struct icom_port *icom_port)
+{
+        unsigned long temp;
+        unsigned long flags;
+        int port;
+
+        spin_lock_irqsave(&icom_lock, flags);
+
+        port = icom_port->port;
+        if (port == 0 || port == 1)
+                stop_proc[port].global_control_reg = &icom_port->global_reg->control;
+        else
+                stop_proc[port].global_control_reg = &icom_port->global_reg->control_2;
+
+
+        if (port < 4) {
+                temp = readl(stop_proc[port].global_control_reg);
+                temp =
+                        (temp & ~start_proc[port].processor_id) | stop_proc[port].processor_id;
+                writel(temp, stop_proc[port].global_control_reg);
+
+                /* write flush */
+                readl(stop_proc[port].global_control_reg);
+        } else {
+                dev_err(&icom_port->adapter->pci_dev->dev,
+                        "Invalid port assignment\n");
+        }
+
+        spin_unlock_irqrestore(&icom_lock, flags);
+}
+
+static void start_processor(struct icom_port *icom_port)
+{
+        unsigned long temp;
+        unsigned long flags;
+        int port;
+
+        spin_lock_irqsave(&icom_lock, flags);
+
+        port = icom_port->port;
+        if (port == 0 || port == 1)
+                start_proc[port].global_control_reg = &icom_port->global_reg->control;
+        else
+                start_proc[port].global_control_reg = &icom_port->global_reg->control_2;
+        if (port < 4) {
+                temp = readl(start_proc[port].global_control_reg);
+                temp =
+                        (temp & ~stop_proc[port].processor_id) | start_proc[port].processor_id;
+                writel(temp, start_proc[port].global_control_reg);
+
+                /* write flush */
+                readl(start_proc[port].global_control_reg);
+        } else {
+                dev_err(&icom_port->adapter->pci_dev->dev,
+                        "Invalid port assignment\n");
+        }
+
+        spin_unlock_irqrestore(&icom_lock, flags);
+}
+
+static void load_code(struct icom_port *icom_port)
+{
+        const struct firmware *fw;
+        char __iomem *iram_ptr;
+        int index;
+        int status = 0;
+        void __iomem *dram_ptr = icom_port->dram;
+        dma_addr_t temp_pci;
+        unsigned char *new_page = NULL;
+        unsigned char cable_id = NO_CABLE;
+        struct pci_dev *dev = icom_port->adapter->pci_dev;
+
+        /* Clear out any pending interrupts */
+        writew(0x3FFF, icom_port->int_reg);
+
+        trace(icom_port, "CLEAR_INTERRUPTS", 0);
+
+        /* Stop processor */
+        stop_processor(icom_port);
+
+        /* Zero out DRAM */
+        memset_io(dram_ptr, 0, 512);
+
+        /* Load Call Setup into Adapter */
+        if (request_firmware(&fw, "icom_call_setup.bin", &dev->dev) < 0) {
+                dev_err(&dev->dev,"Unable to load icom_call_setup.bin firmware image\n");
+                status = -1;
+                goto load_code_exit;
+        }
+
+        if (fw->size > ICOM_DCE_IRAM_OFFSET) {
+                dev_err(&dev->dev, "Invalid firmware image for icom_call_setup.bin found.\n");
+                release_firmware(fw);
+                status = -1;
+                goto load_code_exit;
+        }
+
+        iram_ptr = (char __iomem *)icom_port->dram + ICOM_IRAM_OFFSET;
+        for (index = 0; index < fw->size; index++)
+                writeb(fw->data[index], &iram_ptr[index]);
+
+        release_firmware(fw);
+
+        /* Load Resident DCE portion of Adapter */
+        if (request_firmware(&fw, "icom_res_dce.bin", &dev->dev) < 0) {
+                dev_err(&dev->dev,"Unable to load icom_res_dce.bin firmware image\n");
+                status = -1;
+                goto load_code_exit;
+        }
+
+        if (fw->size > ICOM_IRAM_SIZE) {
+                dev_err(&dev->dev, "Invalid firmware image for icom_res_dce.bin found.\n");
+                release_firmware(fw);
+                status = -1;
+                goto load_code_exit;
+        }
+
+        iram_ptr = (char __iomem *) icom_port->dram + ICOM_IRAM_OFFSET;
+        for (index = ICOM_DCE_IRAM_OFFSET; index < fw->size; index++)
+                writeb(fw->data[index], &iram_ptr[index]);
+
+        release_firmware(fw);
+
+        /* Set Hardware level */
+        if (icom_port->adapter->version == ADAPTER_V2)
+                writeb(V2_HARDWARE, &(icom_port->dram->misc_flags));
+
+        /* Start the processor in Adapter */
+        start_processor(icom_port);
+
+        writeb((HDLC_PPP_PURE_ASYNC | HDLC_FF_FILL),
+               &(icom_port->dram->HDLCConfigReg));
+        writeb(0x04, &(icom_port->dram->FlagFillIdleTimer));    /* 0.5 seconds */
+        writeb(0x00, &(icom_port->dram->CmdReg));
+        writeb(0x10, &(icom_port->dram->async_config3));
+        writeb((ICOM_ACFG_DRIVE1 | ICOM_ACFG_NO_PARITY | ICOM_ACFG_8BPC |
+                ICOM_ACFG_1STOP_BIT), &(icom_port->dram->async_config2));
+
+        /*Set up data in icom DRAM to indicate where personality
+         *code is located and its length.
+         */
+        new_page = pci_alloc_consistent(dev, 4096, &temp_pci);
+
+        if (!new_page) {
+                dev_err(&dev->dev, "Can not allocate DMA buffer\n");
+                status = -1;
+                goto load_code_exit;
+        }
+
+        if (request_firmware(&fw, "icom_asc.bin", &dev->dev) < 0) {
+                dev_err(&dev->dev,"Unable to load icom_asc.bin firmware image\n");
+                status = -1;
+                goto load_code_exit;
+        }
+
+        if (fw->size > ICOM_DCE_IRAM_OFFSET) {
+                dev_err(&dev->dev, "Invalid firmware image for icom_asc.bin found.\n");
+                release_firmware(fw);
+                status = -1;
+                goto load_code_exit;
+        }
+
+        for (index = 0; index < fw->size; index++)
+                new_page[index] = fw->data[index];
+
+        release_firmware(fw);
+
+        writeb((char) ((fw->size + 16)/16), &icom_port->dram->mac_length);
+        writel(temp_pci, &icom_port->dram->mac_load_addr);
+
+        /*Setting the syncReg to 0x80 causes adapter to start downloading
+           the personality code into adapter instruction RAM.
+           Once code is loaded, it will begin executing and, based on
+           information provided above, will start DMAing data from
+           shared memory to adapter DRAM.
+         */
+        /* the wait loop below verifies this write operation has been done
+           and processed
+        */
+        writeb(START_DOWNLOAD, &icom_port->dram->sync);
+
+        /* Wait max 1 Sec for data download and processor to start */
+        for (index = 0; index < 10; index++) {
+                msleep(100);
+                if (readb(&icom_port->dram->misc_flags) & ICOM_HDW_ACTIVE)
+                        break;
+        }
+
+        if (index == 10)
+                status = -1;
+
+        /*
+         * check Cable ID
+         */
+        cable_id = readb(&icom_port->dram->cable_id);
+
+        if (cable_id & ICOM_CABLE_ID_VALID) {
+                /* Get cable ID into the lower 4 bits (standard form) */
+                cable_id = (cable_id & ICOM_CABLE_ID_MASK) >> 4;
+                icom_port->cable_id = cable_id;
+        } else {
+                dev_err(&dev->dev,"Invalid or no cable attached\n");
+                icom_port->cable_id = NO_CABLE;
+        }
+
+      load_code_exit:
+
+        if (status != 0) {
+                /* Clear out any pending interrupts */
+                writew(0x3FFF, icom_port->int_reg);
+
+                /* Turn off port */
+                writeb(ICOM_DISABLE, &(icom_port->dram->disable));
+
+                /* Stop processor */
+                stop_processor(icom_port);
+
+                dev_err(&icom_port->adapter->pci_dev->dev,"Port not opertional\n");
+        }
+
+        if (new_page != NULL)
+                pci_free_consistent(dev, 4096, new_page, temp_pci);
+}
+
+static int startup(struct icom_port *icom_port)
+{
+        unsigned long temp;
+        unsigned char cable_id, raw_cable_id;
+        unsigned long flags;
+        int port;
+
+        trace(icom_port, "STARTUP", 0);
+
+        if (!icom_port->dram) {
+                /* should NEVER be NULL */
+                dev_err(&icom_port->adapter->pci_dev->dev,
+                        "Unusable Port, port configuration missing\n");
+                return -ENODEV;
+        }
+
+        /*
+         * check Cable ID
+         */
+        raw_cable_id = readb(&icom_port->dram->cable_id);
+        trace(icom_port, "CABLE_ID", raw_cable_id);
+
+        /* Get cable ID into the lower 4 bits (standard form) */
+        cable_id = (raw_cable_id & ICOM_CABLE_ID_MASK) >> 4;
+
+        /* Check for valid Cable ID */
+        if (!(raw_cable_id & ICOM_CABLE_ID_VALID) ||
+            (cable_id != icom_port->cable_id)) {
+
+                /* reload adapter code, pick up any potential changes in cable id */
+                load_code(icom_port);
+
+                /* still no sign of cable, error out */
+                raw_cable_id = readb(&icom_port->dram->cable_id);
+                cable_id = (raw_cable_id & ICOM_CABLE_ID_MASK) >> 4;
+                if (!(raw_cable_id & ICOM_CABLE_ID_VALID) ||
+                    (icom_port->cable_id == NO_CABLE))
+                        return -EIO;
+        }
+
+        /*
+         * Finally, clear and  enable interrupts
+         */
+        spin_lock_irqsave(&icom_lock, flags);
+        port = icom_port->port;
+        if (port == 0 || port == 1)
+                int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask;
+        else
+                int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask_2;
+
+        if (port == 0 || port == 2)
+                writew(0x00FF, icom_port->int_reg);
+        else
+                writew(0x3F00, icom_port->int_reg);
+        if (port < 4) {
+                temp = readl(int_mask_tbl[port].global_int_mask);
+                writel(temp & ~int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
+
+                /* write flush */
+                readl(int_mask_tbl[port].global_int_mask);
+        } else {
+                dev_err(&icom_port->adapter->pci_dev->dev,
+                        "Invalid port assignment\n");
+        }
+
+        spin_unlock_irqrestore(&icom_lock, flags);
+        return 0;
+}
+
+static void shutdown(struct icom_port *icom_port)
+{
+        unsigned long temp;
+        unsigned char cmdReg;
+        unsigned long flags;
+        int port;
+
+        spin_lock_irqsave(&icom_lock, flags);
+        trace(icom_port, "SHUTDOWN", 0);
+
+        /*
+         * disable all interrupts
+         */
+        port = icom_port->port;
+        if (port == 0 || port == 1)
+                int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask;
+        else
+                int_mask_tbl[port].global_int_mask = &icom_port->global_reg->int_mask_2;
+
+        if (port < 4) {
+                temp = readl(int_mask_tbl[port].global_int_mask);
+                writel(temp | int_mask_tbl[port].processor_id, int_mask_tbl[port].global_int_mask);
+
+                /* write flush */
+                readl(int_mask_tbl[port].global_int_mask);
+        } else {
+                dev_err(&icom_port->adapter->pci_dev->dev,
+                        "Invalid port assignment\n");
+        }
+        spin_unlock_irqrestore(&icom_lock, flags);
+
+        /*
+         * disable break condition
+         */
+        cmdReg = readb(&icom_port->dram->CmdReg);
+        if (cmdReg & CMD_SND_BREAK) {
+                writeb(cmdReg & ~CMD_SND_BREAK, &icom_port->dram->CmdReg);
+        }
+}
+
+static int icom_write(struct uart_port *port)
+{
+        unsigned long data_count;
+        unsigned char cmdReg;
+        unsigned long offset;
+        int temp_tail = port->state->xmit.tail;
+
+        trace(ICOM_PORT, "WRITE", 0);
+
+        if (cpu_to_le16(ICOM_PORT->statStg->xmit[0].flags) &
+            SA_FLAGS_READY_TO_XMIT) {
+                trace(ICOM_PORT, "WRITE_FULL", 0);
+                return 0;
+        }
+
+        data_count = 0;
+        while ((port->state->xmit.head != temp_tail) &&
+               (data_count <= XMIT_BUFF_SZ)) {
+
+                ICOM_PORT->xmit_buf[data_count++] =
+                    port->state->xmit.buf[temp_tail];
+
+                temp_tail++;
+                temp_tail &= (UART_XMIT_SIZE - 1);
+        }
+
+        if (data_count) {
+                ICOM_PORT->statStg->xmit[0].flags =
+                    cpu_to_le16(SA_FLAGS_READY_TO_XMIT);
+                ICOM_PORT->statStg->xmit[0].leLength =
+                    cpu_to_le16(data_count);
+                offset =
+                    (unsigned long) &ICOM_PORT->statStg->xmit[0] -
+                    (unsigned long) ICOM_PORT->statStg;
+                *ICOM_PORT->xmitRestart =
+                    cpu_to_le32(ICOM_PORT->statStg_pci + offset);
+                cmdReg = readb(&ICOM_PORT->dram->CmdReg);
+                writeb(cmdReg | CMD_XMIT_RCV_ENABLE,
+                       &ICOM_PORT->dram->CmdReg);
+                writeb(START_XMIT, &ICOM_PORT->dram->StartXmitCmd);
+                trace(ICOM_PORT, "WRITE_START", data_count);
+                /* write flush */
+                readb(&ICOM_PORT->dram->StartXmitCmd);
+        }
+
+        return data_count;
+}
+
+static inline void check_modem_status(struct icom_port *icom_port)
+{
+        static char old_status = 0;
+        char delta_status;
+        unsigned char status;
+
+        spin_lock(&icom_port->uart_port.lock);
+
+        /*modem input register */
+        status = readb(&icom_port->dram->isr);
+        trace(icom_port, "CHECK_MODEM", status);
+        delta_status = status ^ old_status;
+        if (delta_status) {
+                if (delta_status & ICOM_RI)
+                        icom_port->uart_port.icount.rng++;
+                if (delta_status & ICOM_DSR)
+                        icom_port->uart_port.icount.dsr++;
+                if (delta_status & ICOM_DCD)
+                        uart_handle_dcd_change(&icom_port->uart_port,
+                                               delta_status & ICOM_DCD);
+                if (delta_status & ICOM_CTS)
+                        uart_handle_cts_change(&icom_port->uart_port,
+                                               delta_status & ICOM_CTS);
+
+                wake_up_interruptible(&icom_port->uart_port.state->
+                                      port.delta_msr_wait);
+                old_status = status;
+        }
+        spin_unlock(&icom_port->uart_port.lock);
+}
+
+static void xmit_interrupt(u16 port_int_reg, struct icom_port *icom_port)
+{
+        unsigned short int count;
+        int i;
+
+        if (port_int_reg & (INT_XMIT_COMPLETED)) {
+                trace(icom_port, "XMIT_COMPLETE", 0);
+
+                /* clear buffer in use bit */
+                icom_port->statStg->xmit[0].flags &=
+                        cpu_to_le16(~SA_FLAGS_READY_TO_XMIT);
+
+                count = (unsigned short int)
+                        cpu_to_le16(icom_port->statStg->xmit[0].leLength);
+                icom_port->uart_port.icount.tx += count;
+
+                for (i=0; i<count &&
+                        !uart_circ_empty(&icom_port->uart_port.state->xmit); i++) {
+
+                        icom_port->uart_port.state->xmit.tail++;
+                        icom_port->uart_port.state->xmit.tail &=
+                                (UART_XMIT_SIZE - 1);
+                }
+
+                if (!icom_write(&icom_port->uart_port))
+                        /* activate write queue */
+                        uart_write_wakeup(&icom_port->uart_port);
+        } else
+                trace(icom_port, "XMIT_DISABLED", 0);
+}
+
+static void recv_interrupt(u16 port_int_reg, struct icom_port *icom_port)
+{
+        short int count, rcv_buff;
+        struct tty_struct *tty = icom_port->uart_port.state->port.tty;
+        unsigned short int status;
+        struct uart_icount *icount;
+        unsigned long offset;
+        unsigned char flag;
+
+        trace(icom_port, "RCV_COMPLETE", 0);
+        rcv_buff = icom_port->next_rcv;
+
+        status = cpu_to_le16(icom_port->statStg->rcv[rcv_buff].flags);
+        while (status & SA_FL_RCV_DONE) {
+                int first = -1;
+
+                trace(icom_port, "FID_STATUS", status);
+                count = cpu_to_le16(icom_port->statStg->rcv[rcv_buff].leLength);
+
+                trace(icom_port, "RCV_COUNT", count);
+
+                trace(icom_port, "REAL_COUNT", count);
+
+                offset =
+                        cpu_to_le32(icom_port->statStg->rcv[rcv_buff].leBuffer) -
+                        icom_port->recv_buf_pci;
+
+                /* Block copy all but the last byte as this may have status */
+                if (count > 0) {
+                        first = icom_port->recv_buf[offset];
+                        tty_insert_flip_string(tty, icom_port->recv_buf + offset, count - 1);
+                }
+
+                icount = &icom_port->uart_port.icount;
+                icount->rx += count;
+
+                /* Break detect logic */
+                if ((status & SA_FLAGS_FRAME_ERROR)
+                    && first == 0) {
+                        status &= ~SA_FLAGS_FRAME_ERROR;
+                        status |= SA_FLAGS_BREAK_DET;
+                        trace(icom_port, "BREAK_DET", 0);
+                }
+
+                flag = TTY_NORMAL;
+
+                if (status &
+                    (SA_FLAGS_BREAK_DET | SA_FLAGS_PARITY_ERROR |
+                     SA_FLAGS_FRAME_ERROR | SA_FLAGS_OVERRUN)) {
+
+                        if (status & SA_FLAGS_BREAK_DET)
+                                icount->brk++;
+                        if (status & SA_FLAGS_PARITY_ERROR)
+                                icount->parity++;
+                        if (status & SA_FLAGS_FRAME_ERROR)
+                                icount->frame++;
+                        if (status & SA_FLAGS_OVERRUN)
+                                icount->overrun++;
+
+                        /*
+                         * Now check to see if character should be
+                         * ignored, and mask off conditions which
+                         * should be ignored.
+                         */
+                        if (status & icom_port->ignore_status_mask) {
+                                trace(icom_port, "IGNORE_CHAR", 0);
+                                goto ignore_char;
+                        }
+
+                        status &= icom_port->read_status_mask;
+
+                        if (status & SA_FLAGS_BREAK_DET) {
+                                flag = TTY_BREAK;
+                        } else if (status & SA_FLAGS_PARITY_ERROR) {
+                                trace(icom_port, "PARITY_ERROR", 0);
+                                flag = TTY_PARITY;
+                        } else if (status & SA_FLAGS_FRAME_ERROR)
+                                flag = TTY_FRAME;
+
+                }
+
+                tty_insert_flip_char(tty, *(icom_port->recv_buf + offset + count - 1), flag);
+
+                if (status & SA_FLAGS_OVERRUN)
+                        /*
+                         * Overrun is special, since it's
+                         * reported immediately, and doesn't
+                         * affect the current character
+                         */
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+ignore_char:
+                icom_port->statStg->rcv[rcv_buff].flags = 0;
+                icom_port->statStg->rcv[rcv_buff].leLength = 0;
+                icom_port->statStg->rcv[rcv_buff].WorkingLength =
+                        (unsigned short int) cpu_to_le16(RCV_BUFF_SZ);
+
+                rcv_buff++;
+                if (rcv_buff == NUM_RBUFFS)
+                        rcv_buff = 0;
+
+                status = cpu_to_le16(icom_port->statStg->rcv[rcv_buff].flags);
+        }
+        icom_port->next_rcv = rcv_buff;
+        tty_flip_buffer_push(tty);
+}
+
+static void process_interrupt(u16 port_int_reg,
+                              struct icom_port *icom_port)
+{
+
+        spin_lock(&icom_port->uart_port.lock);
+        trace(icom_port, "INTERRUPT", port_int_reg);
+
+        if (port_int_reg & (INT_XMIT_COMPLETED | INT_XMIT_DISABLED))
+                xmit_interrupt(port_int_reg, icom_port);
+
+        if (port_int_reg & INT_RCV_COMPLETED)
+                recv_interrupt(port_int_reg, icom_port);
+
+        spin_unlock(&icom_port->uart_port.lock);
+}
+
+static irqreturn_t icom_interrupt(int irq, void *dev_id)
+{
+        void __iomem * int_reg;
+        u32 adapter_interrupts;
+        u16 port_int_reg;
+        struct icom_adapter *icom_adapter;
+        struct icom_port *icom_port;
+
+        /* find icom_port for this interrupt */
+        icom_adapter = (struct icom_adapter *) dev_id;
+
+        if (icom_adapter->version == ADAPTER_V2) {
+                int_reg = icom_adapter->base_addr + 0x8024;
+
+                adapter_interrupts = readl(int_reg);
+
+                if (adapter_interrupts & 0x00003FFF) {
+                        /* port 2 interrupt,  NOTE:  for all ADAPTER_V2, port 2 will be active */
+                        icom_port = &icom_adapter->port_info[2];
+                        port_int_reg = (u16) adapter_interrupts;
+                        process_interrupt(port_int_reg, icom_port);
+                        check_modem_status(icom_port);
+                }
+                if (adapter_interrupts & 0x3FFF0000) {
+                        /* port 3 interrupt */
+                        icom_port = &icom_adapter->port_info[3];
+                        if (icom_port->status == ICOM_PORT_ACTIVE) {
+                                port_int_reg =
+                                    (u16) (adapter_interrupts >> 16);
+                                process_interrupt(port_int_reg, icom_port);
+                                check_modem_status(icom_port);
+                        }
+                }
+
+                /* Clear out any pending interrupts */
+                writel(adapter_interrupts, int_reg);
+
+                int_reg = icom_adapter->base_addr + 0x8004;
+        } else {
+                int_reg = icom_adapter->base_addr + 0x4004;
+        }
+
+        adapter_interrupts = readl(int_reg);
+
+        if (adapter_interrupts & 0x00003FFF) {
+                /* port 0 interrupt, NOTE:  for all adapters, port 0 will be active */
+                icom_port = &icom_adapter->port_info[0];
+                port_int_reg = (u16) adapter_interrupts;
+                process_interrupt(port_int_reg, icom_port);
+                check_modem_status(icom_port);
+        }
+        if (adapter_interrupts & 0x3FFF0000) {
+                /* port 1 interrupt */
+                icom_port = &icom_adapter->port_info[1];
+                if (icom_port->status == ICOM_PORT_ACTIVE) {
+                        port_int_reg = (u16) (adapter_interrupts >> 16);
+                        process_interrupt(port_int_reg, icom_port);
+                        check_modem_status(icom_port);
+                }
+        }
+
+        /* Clear out any pending interrupts */
+        writel(adapter_interrupts, int_reg);
+
+        /* flush the write */
+        adapter_interrupts = readl(int_reg);
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * ------------------------------------------------------------------
+ * Begin serial-core API
+ * ------------------------------------------------------------------
+ */
+static unsigned int icom_tx_empty(struct uart_port *port)
+{
+        int ret;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        if (cpu_to_le16(ICOM_PORT->statStg->xmit[0].flags) &
+            SA_FLAGS_READY_TO_XMIT)
+                ret = TIOCSER_TEMT;
+        else
+                ret = 0;
+
+        spin_unlock_irqrestore(&port->lock, flags);
+        return ret;
+}
+
+static void icom_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        unsigned char local_osr;
+
+        trace(ICOM_PORT, "SET_MODEM", 0);
+        local_osr = readb(&ICOM_PORT->dram->osr);
+
+        if (mctrl & TIOCM_RTS) {
+                trace(ICOM_PORT, "RAISE_RTS", 0);
+                local_osr |= ICOM_RTS;
+        } else {
+                trace(ICOM_PORT, "LOWER_RTS", 0);
+                local_osr &= ~ICOM_RTS;
+        }
+
+        if (mctrl & TIOCM_DTR) {
+                trace(ICOM_PORT, "RAISE_DTR", 0);
+                local_osr |= ICOM_DTR;
+        } else {
+                trace(ICOM_PORT, "LOWER_DTR", 0);
+                local_osr &= ~ICOM_DTR;
+        }
+
+        writeb(local_osr, &ICOM_PORT->dram->osr);
+}
+
+static unsigned int icom_get_mctrl(struct uart_port *port)
+{
+        unsigned char status;
+        unsigned int result;
+
+        trace(ICOM_PORT, "GET_MODEM", 0);
+
+        status = readb(&ICOM_PORT->dram->isr);
+
+        result = ((status & ICOM_DCD) ? TIOCM_CAR : 0)
+            | ((status & ICOM_RI) ? TIOCM_RNG : 0)
+            | ((status & ICOM_DSR) ? TIOCM_DSR : 0)
+            | ((status & ICOM_CTS) ? TIOCM_CTS : 0);
+        return result;
+}
+
+static void icom_stop_tx(struct uart_port *port)
+{
+        unsigned char cmdReg;
+
+        trace(ICOM_PORT, "STOP", 0);
+        cmdReg = readb(&ICOM_PORT->dram->CmdReg);
+        writeb(cmdReg | CMD_HOLD_XMIT, &ICOM_PORT->dram->CmdReg);
+}
+
+static void icom_start_tx(struct uart_port *port)
+{
+        unsigned char cmdReg;
+
+        trace(ICOM_PORT, "START", 0);
+        cmdReg = readb(&ICOM_PORT->dram->CmdReg);
+        if ((cmdReg & CMD_HOLD_XMIT) == CMD_HOLD_XMIT)
+                writeb(cmdReg & ~CMD_HOLD_XMIT,
+                       &ICOM_PORT->dram->CmdReg);
+
+        icom_write(port);
+}
+
+static void icom_send_xchar(struct uart_port *port, char ch)
+{
+        unsigned char xdata;
+        int index;
+        unsigned long flags;
+
+        trace(ICOM_PORT, "SEND_XCHAR", ch);
+
+        /* wait .1 sec to send char */
+        for (index = 0; index < 10; index++) {
+                spin_lock_irqsave(&port->lock, flags);
+                xdata = readb(&ICOM_PORT->dram->xchar);
+                if (xdata == 0x00) {
+                        trace(ICOM_PORT, "QUICK_WRITE", 0);
+                        writeb(ch, &ICOM_PORT->dram->xchar);
+
+                        /* flush write operation */
+                        xdata = readb(&ICOM_PORT->dram->xchar);
+                        spin_unlock_irqrestore(&port->lock, flags);
+                        break;
+                }
+                spin_unlock_irqrestore(&port->lock, flags);
+                msleep(10);
+        }
+}
+
+static void icom_stop_rx(struct uart_port *port)
+{
+        unsigned char cmdReg;
+
+        cmdReg = readb(&ICOM_PORT->dram->CmdReg);
+        writeb(cmdReg & ~CMD_RCV_ENABLE, &ICOM_PORT->dram->CmdReg);
+}
+
+static void icom_enable_ms(struct uart_port *port)
+{
+        /* no-op */
+}
+
+static void icom_break(struct uart_port *port, int break_state)
+{
+        unsigned char cmdReg;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        trace(ICOM_PORT, "BREAK", 0);
+        cmdReg = readb(&ICOM_PORT->dram->CmdReg);
+        if (break_state == -1) {
+                writeb(cmdReg | CMD_SND_BREAK, &ICOM_PORT->dram->CmdReg);
+        } else {
+                writeb(cmdReg & ~CMD_SND_BREAK, &ICOM_PORT->dram->CmdReg);
+        }
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int icom_open(struct uart_port *port)
+{
+        int retval;
+
+        kref_get(&ICOM_PORT->adapter->kref);
+        retval = startup(ICOM_PORT);
+
+        if (retval) {
+                kref_put(&ICOM_PORT->adapter->kref, icom_kref_release);
+                trace(ICOM_PORT, "STARTUP_ERROR", 0);
+                return retval;
+        }
+
+        return 0;
+}
+
+static void icom_close(struct uart_port *port)
+{
+        unsigned char cmdReg;
+
+        trace(ICOM_PORT, "CLOSE", 0);
+
+        /* stop receiver */
+        cmdReg = readb(&ICOM_PORT->dram->CmdReg);
+        writeb(cmdReg & (unsigned char) ~CMD_RCV_ENABLE,
+               &ICOM_PORT->dram->CmdReg);
+
+        shutdown(ICOM_PORT);
+
+        kref_put(&ICOM_PORT->adapter->kref, icom_kref_release);
+}
+
+static void icom_set_termios(struct uart_port *port,
+                             struct ktermios *termios,
+                             struct ktermios *old_termios)
+{
+        int baud;
+        unsigned cflag, iflag;
+        char new_config2;
+        char new_config3 = 0;
+        char tmp_byte;
+        int index;
+        int rcv_buff, xmit_buff;
+        unsigned long offset;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        trace(ICOM_PORT, "CHANGE_SPEED", 0);
+
+        cflag = termios->c_cflag;
+        iflag = termios->c_iflag;
+
+        new_config2 = ICOM_ACFG_DRIVE1;
+
+        /* byte size and parity */
+        switch (cflag & CSIZE) {
+        case CS5:               /* 5 bits/char */
+                new_config2 |= ICOM_ACFG_5BPC;
+                break;
+        case CS6:               /* 6 bits/char */
+                new_config2 |= ICOM_ACFG_6BPC;
+                break;
+        case CS7:               /* 7 bits/char */
+                new_config2 |= ICOM_ACFG_7BPC;
+                break;
+        case CS8:               /* 8 bits/char */
+                new_config2 |= ICOM_ACFG_8BPC;
+                break;
+        default:
+                break;
+        }
+        if (cflag & CSTOPB) {
+                /* 2 stop bits */
+                new_config2 |= ICOM_ACFG_2STOP_BIT;
+        }
+        if (cflag & PARENB) {
+                /* parity bit enabled */
+                new_config2 |= ICOM_ACFG_PARITY_ENAB;
+                trace(ICOM_PORT, "PARENB", 0);
+        }
+        if (cflag & PARODD) {
+                /* odd parity */
+                new_config2 |= ICOM_ACFG_PARITY_ODD;
+                trace(ICOM_PORT, "PARODD", 0);
+        }
+
+        /* Determine divisor based on baud rate */
+        baud = uart_get_baud_rate(port, termios, old_termios,
+                                  icom_acfg_baud[0],
+                                  icom_acfg_baud[BAUD_TABLE_LIMIT]);
+        if (!baud)
+                baud = 9600;    /* B0 transition handled in rs_set_termios */
+
+        for (index = 0; index < BAUD_TABLE_LIMIT; index++) {
+                if (icom_acfg_baud[index] == baud) {
+                        new_config3 = index;
+                        break;
+                }
+        }
+
+        uart_update_timeout(port, cflag, baud);
+
+        /* CTS flow control flag and modem status interrupts */
+        tmp_byte = readb(&(ICOM_PORT->dram->HDLCConfigReg));
+        if (cflag & CRTSCTS)
+                tmp_byte |= HDLC_HDW_FLOW;
+        else
+                tmp_byte &= ~HDLC_HDW_FLOW;
+        writeb(tmp_byte, &(ICOM_PORT->dram->HDLCConfigReg));
+
+        /*
+         * Set up parity check flag
+         */
+        ICOM_PORT->read_status_mask = SA_FLAGS_OVERRUN | SA_FL_RCV_DONE;
+        if (iflag & INPCK)
+                ICOM_PORT->read_status_mask |=
+                    SA_FLAGS_FRAME_ERROR | SA_FLAGS_PARITY_ERROR;
+
+        if ((iflag & BRKINT) || (iflag & PARMRK))
+                ICOM_PORT->read_status_mask |= SA_FLAGS_BREAK_DET;
+
+        /*
+         * Characters to ignore
+         */
+        ICOM_PORT->ignore_status_mask = 0;
+        if (iflag & IGNPAR)
+                ICOM_PORT->ignore_status_mask |=
+                    SA_FLAGS_PARITY_ERROR | SA_FLAGS_FRAME_ERROR;
+        if (iflag & IGNBRK) {
+                ICOM_PORT->ignore_status_mask |= SA_FLAGS_BREAK_DET;
+                /*
+                 * If we're ignore parity and break indicators, ignore
+                 * overruns too.  (For real raw support).
+                 */
+                if (iflag & IGNPAR)
+                        ICOM_PORT->ignore_status_mask |= SA_FLAGS_OVERRUN;
+        }
+
+        /*
+         * !!! ignore all characters if CREAD is not set
+         */
+        if ((cflag & CREAD) == 0)
+                ICOM_PORT->ignore_status_mask |= SA_FL_RCV_DONE;
+
+        /* Turn off Receiver to prepare for reset */
+        writeb(CMD_RCV_DISABLE, &ICOM_PORT->dram->CmdReg);
+
+        for (index = 0; index < 10; index++) {
+                if (readb(&ICOM_PORT->dram->PrevCmdReg) == 0x00) {
+                        break;
+                }
+        }
+
+        /* clear all current buffers of data */
+        for (rcv_buff = 0; rcv_buff < NUM_RBUFFS; rcv_buff++) {
+                ICOM_PORT->statStg->rcv[rcv_buff].flags = 0;
+                ICOM_PORT->statStg->rcv[rcv_buff].leLength = 0;
+                ICOM_PORT->statStg->rcv[rcv_buff].WorkingLength =
+                    (unsigned short int) cpu_to_le16(RCV_BUFF_SZ);
+        }
+
+        for (xmit_buff = 0; xmit_buff < NUM_XBUFFS; xmit_buff++) {
+                ICOM_PORT->statStg->xmit[xmit_buff].flags = 0;
+        }
+
+        /* activate changes and start xmit and receiver here */
+        /* Enable the receiver */
+        writeb(new_config3, &(ICOM_PORT->dram->async_config3));
+        writeb(new_config2, &(ICOM_PORT->dram->async_config2));
+        tmp_byte = readb(&(ICOM_PORT->dram->HDLCConfigReg));
+        tmp_byte |= HDLC_PPP_PURE_ASYNC | HDLC_FF_FILL;
+        writeb(tmp_byte, &(ICOM_PORT->dram->HDLCConfigReg));
+        writeb(0x04, &(ICOM_PORT->dram->FlagFillIdleTimer));    /* 0.5 seconds */
+        writeb(0xFF, &(ICOM_PORT->dram->ier));  /* enable modem signal interrupts */
+
+        /* reset processor */
+        writeb(CMD_RESTART, &ICOM_PORT->dram->CmdReg);
+
+        for (index = 0; index < 10; index++) {
+                if (readb(&ICOM_PORT->dram->CmdReg) == 0x00) {
+                        break;
+                }
+        }
+
+        /* Enable Transmitter and Receiver */
+        offset =
+            (unsigned long) &ICOM_PORT->statStg->rcv[0] -
+            (unsigned long) ICOM_PORT->statStg;
+        writel(ICOM_PORT->statStg_pci + offset,
+               &ICOM_PORT->dram->RcvStatusAddr);
+        ICOM_PORT->next_rcv = 0;
+        ICOM_PORT->put_length = 0;
+        *ICOM_PORT->xmitRestart = 0;
+        writel(ICOM_PORT->xmitRestart_pci,
+               &ICOM_PORT->dram->XmitStatusAddr);
+        trace(ICOM_PORT, "XR_ENAB", 0);
+        writeb(CMD_XMIT_RCV_ENABLE, &ICOM_PORT->dram->CmdReg);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *icom_type(struct uart_port *port)
+{
+        return "icom";
+}
+
+static void icom_release_port(struct uart_port *port)
+{
+}
+
+static int icom_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void icom_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_ICOM;
+}
+
+static struct uart_ops icom_ops = {
+        .tx_empty = icom_tx_empty,
+        .set_mctrl = icom_set_mctrl,
+        .get_mctrl = icom_get_mctrl,
+        .stop_tx = icom_stop_tx,
+        .start_tx = icom_start_tx,
+        .send_xchar = icom_send_xchar,
+        .stop_rx = icom_stop_rx,
+        .enable_ms = icom_enable_ms,
+        .break_ctl = icom_break,
+        .startup = icom_open,
+        .shutdown = icom_close,
+        .set_termios = icom_set_termios,
+        .type = icom_type,
+        .release_port = icom_release_port,
+        .request_port = icom_request_port,
+        .config_port = icom_config_port,
+};
+
+#define ICOM_CONSOLE NULL
+
+static struct uart_driver icom_uart_driver = {
+        .owner = THIS_MODULE,
+        .driver_name = ICOM_DRIVER_NAME,
+        .dev_name = "ttyA",
+        .major = ICOM_MAJOR,
+        .minor = ICOM_MINOR_START,
+        .nr = NR_PORTS,
+        .cons = ICOM_CONSOLE,
+};
+
+static int __devinit icom_init_ports(struct icom_adapter *icom_adapter)
+{
+        u32 subsystem_id = icom_adapter->subsystem_id;
+        int i;
+        struct icom_port *icom_port;
+
+        if (icom_adapter->version == ADAPTER_V1) {
+                icom_adapter->numb_ports = 2;
+
+                for (i = 0; i < 2; i++) {
+                        icom_port = &icom_adapter->port_info[i];
+                        icom_port->port = i;
+                        icom_port->status = ICOM_PORT_ACTIVE;
+                        icom_port->imbed_modem = ICOM_UNKNOWN;
+                }
+        } else {
+                if (subsystem_id == PCI_DEVICE_ID_IBM_ICOM_FOUR_PORT_MODEL) {
+                        icom_adapter->numb_ports = 4;
+
+                        for (i = 0; i < 4; i++) {
+                                icom_port = &icom_adapter->port_info[i];
+
+                                icom_port->port = i;
+                                icom_port->status = ICOM_PORT_ACTIVE;
+                                icom_port->imbed_modem = ICOM_IMBED_MODEM;
+                        }
+                } else {
+                        icom_adapter->numb_ports = 4;
+
+                        icom_adapter->port_info[0].port = 0;
+                        icom_adapter->port_info[0].status = ICOM_PORT_ACTIVE;
+
+                        if (subsystem_id ==
+                            PCI_DEVICE_ID_IBM_ICOM_V2_ONE_PORT_RVX_ONE_PORT_MDM) {
+                                icom_adapter->port_info[0].imbed_modem = ICOM_IMBED_MODEM;
+                        } else {
+                                icom_adapter->port_info[0].imbed_modem = ICOM_RVX;
+                        }
+
+                        icom_adapter->port_info[1].status = ICOM_PORT_OFF;
+
+                        icom_adapter->port_info[2].port = 2;
+                        icom_adapter->port_info[2].status = ICOM_PORT_ACTIVE;
+                        icom_adapter->port_info[2].imbed_modem = ICOM_RVX;
+                        icom_adapter->port_info[3].status = ICOM_PORT_OFF;
+                }
+        }
+
+        return 0;
+}
+
+static void icom_port_active(struct icom_port *icom_port, struct icom_adapter *icom_adapter, int port_num)
+{
+        if (icom_adapter->version == ADAPTER_V1) {
+                icom_port->global_reg = icom_adapter->base_addr + 0x4000;
+                icom_port->int_reg = icom_adapter->base_addr +
+                    0x4004 + 2 - 2 * port_num;
+        } else {
+                icom_port->global_reg = icom_adapter->base_addr + 0x8000;
+                if (icom_port->port < 2)
+                        icom_port->int_reg = icom_adapter->base_addr +
+                            0x8004 + 2 - 2 * icom_port->port;
+                else
+                        icom_port->int_reg = icom_adapter->base_addr +
+                            0x8024 + 2 - 2 * (icom_port->port - 2);
+        }
+}
+static int __devinit icom_load_ports(struct icom_adapter *icom_adapter)
+{
+        struct icom_port *icom_port;
+        int port_num;
+
+        for (port_num = 0; port_num < icom_adapter->numb_ports; port_num++) {
+
+                icom_port = &icom_adapter->port_info[port_num];
+
+                if (icom_port->status == ICOM_PORT_ACTIVE) {
+                        icom_port_active(icom_port, icom_adapter, port_num);
+                        icom_port->dram = icom_adapter->base_addr +
+                                        0x2000 * icom_port->port;
+
+                        icom_port->adapter = icom_adapter;
+
+                        /* get port memory */
+                        if (get_port_memory(icom_port) != 0) {
+                                dev_err(&icom_port->adapter->pci_dev->dev,
+                                        "Memory allocation for port FAILED\n");
+                        }
+                }
+        }
+        return 0;
+}
+
+static int __devinit icom_alloc_adapter(struct icom_adapter
+                                        **icom_adapter_ref)
+{
+        int adapter_count = 0;
+        struct icom_adapter *icom_adapter;
+        struct icom_adapter *cur_adapter_entry;
+        struct list_head *tmp;
+
+        icom_adapter = (struct icom_adapter *)
+            kzalloc(sizeof(struct icom_adapter), GFP_KERNEL);
+
+        if (!icom_adapter) {
+                return -ENOMEM;
+        }
+
+        list_for_each(tmp, &icom_adapter_head) {
+                cur_adapter_entry =
+                    list_entry(tmp, struct icom_adapter,
+                               icom_adapter_entry);
+                if (cur_adapter_entry->index != adapter_count) {
+                        break;
+                }
+                adapter_count++;
+        }
+
+        icom_adapter->index = adapter_count;
+        list_add_tail(&icom_adapter->icom_adapter_entry, tmp);
+
+        *icom_adapter_ref = icom_adapter;
+        return 0;
+}
+
+static void icom_free_adapter(struct icom_adapter *icom_adapter)
+{
+        list_del(&icom_adapter->icom_adapter_entry);
+        kfree(icom_adapter);
+}
+
+static void icom_remove_adapter(struct icom_adapter *icom_adapter)
+{
+        struct icom_port *icom_port;
+        int index;
+
+        for (index = 0; index < icom_adapter->numb_ports; index++) {
+                icom_port = &icom_adapter->port_info[index];
+
+                if (icom_port->status == ICOM_PORT_ACTIVE) {
+                        dev_info(&icom_adapter->pci_dev->dev,
+                                 "Device removed\n");
+
+                        uart_remove_one_port(&icom_uart_driver,
+                                             &icom_port->uart_port);
+
+                        /* be sure that DTR and RTS are dropped */
+                        writeb(0x00, &icom_port->dram->osr);
+
+                        /* Wait 0.1 Sec for simple Init to complete */
+                        msleep(100);
+
+                        /* Stop proccessor */
+                        stop_processor(icom_port);
+
+                        free_port_memory(icom_port);
+                }
+        }
+
+        free_irq(icom_adapter->pci_dev->irq, (void *) icom_adapter);
+        iounmap(icom_adapter->base_addr);
+        pci_release_regions(icom_adapter->pci_dev);
+        icom_free_adapter(icom_adapter);
+}
+
+static void icom_kref_release(struct kref *kref)
+{
+        struct icom_adapter *icom_adapter;
+
+        icom_adapter = to_icom_adapter(kref);
+        icom_remove_adapter(icom_adapter);
+}
+
+static int __devinit icom_probe(struct pci_dev *dev,
+                                const struct pci_device_id *ent)
+{
+        int index;
+        unsigned int command_reg;
+        int retval;
+        struct icom_adapter *icom_adapter;
+        struct icom_port *icom_port;
+
+        retval = pci_enable_device(dev);
+        if (retval) {
+                dev_err(&dev->dev, "Device enable FAILED\n");
+                return retval;
+        }
+
+        if ( (retval = pci_request_regions(dev, "icom"))) {
+                 dev_err(&dev->dev, "pci_request_regions FAILED\n");
+                 pci_disable_device(dev);
+                 return retval;
+         }
+
+        pci_set_master(dev);
+
+        if ( (retval = pci_read_config_dword(dev, PCI_COMMAND, &command_reg))) {
+                dev_err(&dev->dev, "PCI Config read FAILED\n");
+                return retval;
+        }
+
+        pci_write_config_dword(dev, PCI_COMMAND,
+                command_reg | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER
+                | PCI_COMMAND_PARITY | PCI_COMMAND_SERR);
+
+        if (ent->driver_data == ADAPTER_V1) {
+                pci_write_config_dword(dev, 0x44, 0x8300830A);
+        } else {
+                pci_write_config_dword(dev, 0x44, 0x42004200);
+                pci_write_config_dword(dev, 0x48, 0x42004200);
+        }
+
+
+        retval = icom_alloc_adapter(&icom_adapter);
+        if (retval) {
+                 dev_err(&dev->dev, "icom_alloc_adapter FAILED\n");
+                 retval = -EIO;
+                 goto probe_exit0;
+        }
+
+        icom_adapter->base_addr_pci = pci_resource_start(dev, 0);
+        icom_adapter->pci_dev = dev;
+        icom_adapter->version = ent->driver_data;
+        icom_adapter->subsystem_id = ent->subdevice;
+
+
+        retval = icom_init_ports(icom_adapter);
+        if (retval) {
+                dev_err(&dev->dev, "Port configuration failed\n");
+                goto probe_exit1;
+        }
+
+        icom_adapter->base_addr = pci_ioremap_bar(dev, 0);
+
+        if (!icom_adapter->base_addr)
+                goto probe_exit1;
+
+         /* save off irq and request irq line */
+         if ( (retval = request_irq(dev->irq, icom_interrupt,
+                                   IRQF_DISABLED | IRQF_SHARED, ICOM_DRIVER_NAME,
+                                   (void *) icom_adapter))) {
+                  goto probe_exit2;
+         }
+
+        retval = icom_load_ports(icom_adapter);
+
+        for (index = 0; index < icom_adapter->numb_ports; index++) {
+                icom_port = &icom_adapter->port_info[index];
+
+                if (icom_port->status == ICOM_PORT_ACTIVE) {
+                        icom_port->uart_port.irq = icom_port->adapter->pci_dev->irq;
+                        icom_port->uart_port.type = PORT_ICOM;
+                        icom_port->uart_port.iotype = UPIO_MEM;
+                        icom_port->uart_port.membase =
+                                               (char *) icom_adapter->base_addr_pci;
+                        icom_port->uart_port.fifosize = 16;
+                        icom_port->uart_port.ops = &icom_ops;
+                        icom_port->uart_port.line =
+                        icom_port->port + icom_adapter->index * 4;
+                        if (uart_add_one_port (&icom_uart_driver, &icom_port->uart_port)) {
+                                icom_port->status = ICOM_PORT_OFF;
+                                dev_err(&dev->dev, "Device add failed\n");
+                         } else
+                                dev_info(&dev->dev, "Device added\n");
+                }
+        }
+
+        kref_init(&icom_adapter->kref);
+        return 0;
+
+probe_exit2:
+        iounmap(icom_adapter->base_addr);
+probe_exit1:
+        icom_free_adapter(icom_adapter);
+
+probe_exit0:
+        pci_release_regions(dev);
+        pci_disable_device(dev);
+
+        return retval;
+}
+
+static void __devexit icom_remove(struct pci_dev *dev)
+{
+        struct icom_adapter *icom_adapter;
+        struct list_head *tmp;
+
+        list_for_each(tmp, &icom_adapter_head) {
+                icom_adapter = list_entry(tmp, struct icom_adapter,
+                                          icom_adapter_entry);
+                if (icom_adapter->pci_dev == dev) {
+                        kref_put(&icom_adapter->kref, icom_kref_release);
+                        return;
+                }
+        }
+
+        dev_err(&dev->dev, "Unable to find device to remove\n");
+}
+
+static struct pci_driver icom_pci_driver = {
+        .name = ICOM_DRIVER_NAME,
+        .id_table = icom_pci_table,
+        .probe = icom_probe,
+        .remove = __devexit_p(icom_remove),
+};
+
+static int __init icom_init(void)
+{
+        int ret;
+
+        spin_lock_init(&icom_lock);
+
+        ret = uart_register_driver(&icom_uart_driver);
+        if (ret)
+                return ret;
+
+        ret = pci_register_driver(&icom_pci_driver);
+
+        if (ret < 0)
+                uart_unregister_driver(&icom_uart_driver);
+
+        return ret;
+}
+
+static void __exit icom_exit(void)
+{
+        pci_unregister_driver(&icom_pci_driver);
+        uart_unregister_driver(&icom_uart_driver);
+}
+
+module_init(icom_init);
+module_exit(icom_exit);
+
+MODULE_AUTHOR("Michael Anderson <mjanders@us.ibm.com>");
+MODULE_DESCRIPTION("IBM iSeries Serial IOA driver");
+MODULE_SUPPORTED_DEVICE
+    ("IBM iSeries 2745, 2771, 2772, 2742, 2793 and 2805 Communications adapters");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE("icom_call_setup.bin");
+MODULE_FIRMWARE("icom_res_dce.bin");
+MODULE_FIRMWARE("icom_asc.bin");
diff --git a/drivers/tty/serial/icom.h b/drivers/tty/serial/icom.h
new file mode 100644
index 000000000000..c8029e0025c9
--- /dev/null
+++ b/drivers/tty/serial/icom.h
@@ -0,0 +1,287 @@
+/*
+ * icom.h
+ *
+ * Copyright (C) 2001 Michael Anderson, IBM Corporation
+ *
+ * Serial device driver include file.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/serial_core.h>
+
+#define BAUD_TABLE_LIMIT        ((sizeof(icom_acfg_baud)/sizeof(int)) - 1)
+static int icom_acfg_baud[] = {
+        300,
+        600,
+        900,
+        1200,
+        1800,
+        2400,
+        3600,
+        4800,
+        7200,
+        9600,
+        14400,
+        19200,
+        28800,
+        38400,
+        57600,
+        76800,
+        115200,
+        153600,
+        230400,
+        307200,
+        460800,
+};
+
+struct icom_regs {
+        u32 control;            /* Adapter Control Register     */
+        u32 interrupt;          /* Adapter Interrupt Register   */
+        u32 int_mask;           /* Adapter Interrupt Mask Reg   */
+        u32 int_pri;            /* Adapter Interrupt Priority r */
+        u32 int_reg_b;          /* Adapter non-masked Interrupt */
+        u32 resvd01;
+        u32 resvd02;
+        u32 resvd03;
+        u32 control_2;          /* Adapter Control Register 2   */
+        u32 interrupt_2;        /* Adapter Interrupt Register 2 */
+        u32 int_mask_2;         /* Adapter Interrupt Mask 2     */
+        u32 int_pri_2;          /* Adapter Interrupt Prior 2    */
+        u32 int_reg_2b;         /* Adapter non-masked 2         */
+};
+
+struct func_dram {
+        u32 reserved[108];      /* 0-1B0   reserved by personality code */
+        u32 RcvStatusAddr;      /* 1B0-1B3 Status Address for Next rcv */
+        u8 RcvStnAddr;          /* 1B4     Receive Station Addr */
+        u8 IdleState;           /* 1B5     Idle State */
+        u8 IdleMonitor;         /* 1B6     Idle Monitor */
+        u8 FlagFillIdleTimer;   /* 1B7     Flag Fill Idle Timer */
+        u32 XmitStatusAddr;     /* 1B8-1BB Transmit Status Address */
+        u8 StartXmitCmd;        /* 1BC     Start Xmit Command */
+        u8 HDLCConfigReg;       /* 1BD     Reserved */
+        u8 CauseCode;           /* 1BE     Cause code for fatal error */
+        u8 xchar;               /* 1BF     High priority send */
+        u32 reserved3;          /* 1C0-1C3 Reserved */
+        u8 PrevCmdReg;          /* 1C4     Reserved */
+        u8 CmdReg;              /* 1C5     Command Register */
+        u8 async_config2;       /* 1C6     Async Config Byte 2 */
+        u8 async_config3;       /* 1C7     Async Config Byte 3 */
+        u8 dce_resvd[20];       /* 1C8-1DB DCE Rsvd           */
+        u8 dce_resvd21;         /* 1DC     DCE Rsvd (21st byte */
+        u8 misc_flags;          /* 1DD     misc flags         */
+#define V2_HARDWARE     0x40
+#define ICOM_HDW_ACTIVE 0x01
+        u8 call_length;         /* 1DE     Phone #/CFI buff ln */
+        u8 call_length2;        /* 1DF     Upper byte (unused) */
+        u32 call_addr;          /* 1E0-1E3 Phn #/CFI buff addr */
+        u16 timer_value;        /* 1E4-1E5 general timer value */
+        u8 timer_command;       /* 1E6     general timer cmd  */
+        u8 dce_command;         /* 1E7     dce command reg    */
+        u8 dce_cmd_status;      /* 1E8     dce command stat   */
+        u8 x21_r1_ioff;         /* 1E9     dce ready counter  */
+        u8 x21_r0_ioff;         /* 1EA     dce not ready ctr  */
+        u8 x21_ralt_ioff;       /* 1EB     dce CNR counter    */
+        u8 x21_r1_ion;          /* 1EC     dce ready I on ctr */
+        u8 rsvd_ier;            /* 1ED     Rsvd for IER (if ne */
+        u8 ier;                 /* 1EE     Interrupt Enable   */
+        u8 isr;                 /* 1EF     Input Signal Reg   */
+        u8 osr;                 /* 1F0     Output Signal Reg  */
+        u8 reset;               /* 1F1     Reset/Reload Reg   */
+        u8 disable;             /* 1F2     Disable Reg        */
+        u8 sync;                /* 1F3     Sync Reg           */
+        u8 error_stat;          /* 1F4     Error Status       */
+        u8 cable_id;            /* 1F5     Cable ID           */
+        u8 cs_length;           /* 1F6     CS Load Length     */
+        u8 mac_length;          /* 1F7     Mac Load Length    */
+        u32 cs_load_addr;       /* 1F8-1FB Call Load PCI Addr */
+        u32 mac_load_addr;      /* 1FC-1FF Mac Load PCI Addr  */
+};
+
+/*
+ * adapter defines and structures
+ */
+#define ICOM_CONTROL_START_A         0x00000008
+#define ICOM_CONTROL_STOP_A          0x00000004
+#define ICOM_CONTROL_START_B         0x00000002
+#define ICOM_CONTROL_STOP_B          0x00000001
+#define ICOM_CONTROL_START_C         0x00000008
+#define ICOM_CONTROL_STOP_C          0x00000004
+#define ICOM_CONTROL_START_D         0x00000002
+#define ICOM_CONTROL_STOP_D          0x00000001
+#define ICOM_IRAM_OFFSET             0x1000
+#define ICOM_IRAM_SIZE               0x0C00
+#define ICOM_DCE_IRAM_OFFSET         0x0A00
+#define ICOM_CABLE_ID_VALID          0x01
+#define ICOM_CABLE_ID_MASK           0xF0
+#define ICOM_DISABLE                 0x80
+#define CMD_XMIT_RCV_ENABLE          0xC0
+#define CMD_XMIT_ENABLE              0x40
+#define CMD_RCV_DISABLE              0x00
+#define CMD_RCV_ENABLE               0x80
+#define CMD_RESTART                  0x01
+#define CMD_HOLD_XMIT                0x02
+#define CMD_SND_BREAK                0x04
+#define RS232_CABLE                  0x06
+#define V24_CABLE                    0x0E
+#define V35_CABLE                    0x0C
+#define V36_CABLE                    0x02
+#define NO_CABLE                     0x00
+#define START_DOWNLOAD               0x80
+#define ICOM_INT_MASK_PRC_A          0x00003FFF
+#define ICOM_INT_MASK_PRC_B          0x3FFF0000
+#define ICOM_INT_MASK_PRC_C          0x00003FFF
+#define ICOM_INT_MASK_PRC_D          0x3FFF0000
+#define INT_RCV_COMPLETED            0x1000
+#define INT_XMIT_COMPLETED           0x2000
+#define INT_IDLE_DETECT              0x0800
+#define INT_RCV_DISABLED             0x0400
+#define INT_XMIT_DISABLED            0x0200
+#define INT_RCV_XMIT_SHUTDOWN        0x0100
+#define INT_FATAL_ERROR              0x0080
+#define INT_CABLE_PULL               0x0020
+#define INT_SIGNAL_CHANGE            0x0010
+#define HDLC_PPP_PURE_ASYNC          0x02
+#define HDLC_FF_FILL                 0x00
+#define HDLC_HDW_FLOW                0x01
+#define START_XMIT                   0x80
+#define ICOM_ACFG_DRIVE1             0x20
+#define ICOM_ACFG_NO_PARITY          0x00
+#define ICOM_ACFG_PARITY_ENAB        0x02
+#define ICOM_ACFG_PARITY_ODD         0x01
+#define ICOM_ACFG_8BPC               0x00
+#define ICOM_ACFG_7BPC               0x04
+#define ICOM_ACFG_6BPC               0x08
+#define ICOM_ACFG_5BPC               0x0C
+#define ICOM_ACFG_1STOP_BIT          0x00
+#define ICOM_ACFG_2STOP_BIT          0x10
+#define ICOM_DTR                     0x80
+#define ICOM_RTS                     0x40
+#define ICOM_RI                      0x08
+#define ICOM_DSR                     0x80
+#define ICOM_DCD                     0x20
+#define ICOM_CTS                     0x40
+
+#define NUM_XBUFFS 1
+#define NUM_RBUFFS 2
+#define RCV_BUFF_SZ 0x0200
+#define XMIT_BUFF_SZ 0x1000
+struct statusArea {
+    /**********************************************/
+        /* Transmit Status Area                       */
+    /**********************************************/
+        struct xmit_status_area{
+                u32 leNext;     /* Next entry in Little Endian on Adapter */
+                u32 leNextASD;
+                u32 leBuffer;   /* Buffer for entry in LE for Adapter */
+                u16 leLengthASD;
+                u16 leOffsetASD;
+                u16 leLength;   /* Length of data in segment */
+                u16 flags;
+#define SA_FLAGS_DONE           0x0080  /* Done with Segment */
+#define SA_FLAGS_CONTINUED      0x8000  /* More Segments */
+#define SA_FLAGS_IDLE           0x4000  /* Mark IDLE after frm */
+#define SA_FLAGS_READY_TO_XMIT  0x0800
+#define SA_FLAGS_STAT_MASK      0x007F
+        } xmit[NUM_XBUFFS];
+
+    /**********************************************/
+        /* Receive Status Area                        */
+    /**********************************************/
+        struct {
+                u32 leNext;     /* Next entry in Little Endian on Adapter */
+                u32 leNextASD;
+                u32 leBuffer;   /* Buffer for entry in LE for Adapter */
+                u16 WorkingLength;      /* size of segment */
+                u16 reserv01;
+                u16 leLength;   /* Length of data in segment */
+                u16 flags;
+#define SA_FL_RCV_DONE           0x0010 /* Data ready */
+#define SA_FLAGS_OVERRUN         0x0040
+#define SA_FLAGS_PARITY_ERROR    0x0080
+#define SA_FLAGS_FRAME_ERROR     0x0001
+#define SA_FLAGS_FRAME_TRUNC     0x0002
+#define SA_FLAGS_BREAK_DET       0x0004 /* set conditionally by device driver, not hardware */
+#define SA_FLAGS_RCV_MASK        0xFFE6
+        } rcv[NUM_RBUFFS];
+};
+
+struct icom_adapter;
+
+
+#define ICOM_MAJOR       243
+#define ICOM_MINOR_START 0
+
+struct icom_port {
+        struct uart_port uart_port;
+        u8 imbed_modem;
+#define ICOM_UNKNOWN            1
+#define ICOM_RVX                2
+#define ICOM_IMBED_MODEM        3
+        unsigned char cable_id;
+        unsigned char read_status_mask;
+        unsigned char ignore_status_mask;
+        void __iomem * int_reg;
+        struct icom_regs __iomem *global_reg;
+        struct func_dram __iomem *dram;
+        int port;
+        struct statusArea *statStg;
+        dma_addr_t statStg_pci;
+        u32 *xmitRestart;
+        dma_addr_t xmitRestart_pci;
+        unsigned char *xmit_buf;
+        dma_addr_t xmit_buf_pci;
+        unsigned char *recv_buf;
+        dma_addr_t recv_buf_pci;
+        int next_rcv;
+        int put_length;
+        int status;
+#define ICOM_PORT_ACTIVE        1       /* Port exists. */
+#define ICOM_PORT_OFF           0       /* Port does not exist. */
+        int load_in_progress;
+        struct icom_adapter *adapter;
+};
+
+struct icom_adapter {
+        void __iomem * base_addr;
+        unsigned long base_addr_pci;
+        struct pci_dev *pci_dev;
+        struct icom_port port_info[4];
+        int index;
+        int version;
+#define ADAPTER_V1      0x0001
+#define ADAPTER_V2      0x0002
+        u32 subsystem_id;
+#define FOUR_PORT_MODEL                         0x0252
+#define V2_TWO_PORTS_RVX                        0x021A
+#define V2_ONE_PORT_RVX_ONE_PORT_IMBED_MDM      0x0251
+        int numb_ports;
+        struct list_head icom_adapter_entry;
+        struct kref kref;
+};
+
+/* prototype */
+extern void iCom_sercons_init(void);
+
+struct lookup_proc_table {
+        u32     __iomem *global_control_reg;
+        unsigned long   processor_id;
+};
+
+struct lookup_int_table {
+        u32     __iomem *global_int_mask;
+        unsigned long   processor_id;
+};
diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c
new file mode 100644
index 000000000000..5315525220fb
--- /dev/null
+++ b/drivers/tty/serial/ifx6x60.c
@@ -0,0 +1,1414 @@
+/****************************************************************************
+ *
+ * Driver for the IFX 6x60 spi modem.
+ *
+ * Copyright (C) 2008 Option International
+ * Copyright (C) 2008 Filip Aben <f.aben@option.com>
+ *                    Denis Joseph Barrow <d.barow@option.com>
+ *                    Jan Dumon <j.dumon@option.com>
+ *
+ * Copyright (C) 2009, 2010 Intel Corp
+ * Russ Gorby <russ.gorby@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA
+ *
+ * Driver modified by Intel from Option gtm501l_spi.c
+ *
+ * Notes
+ * o    The driver currently assumes a single device only. If you need to
+ *      change this then look for saved_ifx_dev and add a device lookup
+ * o    The driver is intended to be big-endian safe but has never been
+ *      tested that way (no suitable hardware). There are a couple of FIXME
+ *      notes by areas that may need addressing
+ * o    Some of the GPIO naming/setup assumptions may need revisiting if
+ *      you need to use this driver for another platform.
+ *
+ *****************************************************************************/
+#include <linux/module.h>
+#include <linux/termios.h>
+#include <linux/tty.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/kfifo.h>
+#include <linux/tty_flip.h>
+#include <linux/timer.h>
+#include <linux/serial.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/rfkill.h>
+#include <linux/fs.h>
+#include <linux/ip.h>
+#include <linux/dmapool.h>
+#include <linux/gpio.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/wait.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/spi/ifx_modem.h>
+#include <linux/delay.h>
+
+#include "ifx6x60.h"
+
+#define IFX_SPI_MORE_MASK               0x10
+#define IFX_SPI_MORE_BIT                12      /* bit position in u16 */
+#define IFX_SPI_CTS_BIT                 13      /* bit position in u16 */
+#define IFX_SPI_MODE                    SPI_MODE_1
+#define IFX_SPI_TTY_ID                  0
+#define IFX_SPI_TIMEOUT_SEC             2
+#define IFX_SPI_HEADER_0                (-1)
+#define IFX_SPI_HEADER_F                (-2)
+
+/* forward reference */
+static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
+
+/* local variables */
+static int spi_bpw = 16;                /* 8, 16 or 32 bit word length */
+static struct tty_driver *tty_drv;
+static struct ifx_spi_device *saved_ifx_dev;
+static struct lock_class_key ifx_spi_key;
+
+/* GPIO/GPE settings */
+
+/**
+ *      mrdy_set_high           -       set MRDY GPIO
+ *      @ifx: device we are controlling
+ *
+ */
+static inline void mrdy_set_high(struct ifx_spi_device *ifx)
+{
+        gpio_set_value(ifx->gpio.mrdy, 1);
+}
+
+/**
+ *      mrdy_set_low            -       clear MRDY GPIO
+ *      @ifx: device we are controlling
+ *
+ */
+static inline void mrdy_set_low(struct ifx_spi_device *ifx)
+{
+        gpio_set_value(ifx->gpio.mrdy, 0);
+}
+
+/**
+ *      ifx_spi_power_state_set
+ *      @ifx_dev: our SPI device
+ *      @val: bits to set
+ *
+ *      Set bit in power status and signal power system if status becomes non-0
+ */
+static void
+ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ifx_dev->power_lock, flags);
+
+        /*
+         * if power status is already non-0, just update, else
+         * tell power system
+         */
+        if (!ifx_dev->power_status)
+                pm_runtime_get(&ifx_dev->spi_dev->dev);
+        ifx_dev->power_status |= val;
+
+        spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
+}
+
+/**
+ *      ifx_spi_power_state_clear       -       clear power bit
+ *      @ifx_dev: our SPI device
+ *      @val: bits to clear
+ *
+ *      clear bit in power status and signal power system if status becomes 0
+ */
+static void
+ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&ifx_dev->power_lock, flags);
+
+        if (ifx_dev->power_status) {
+                ifx_dev->power_status &= ~val;
+                if (!ifx_dev->power_status)
+                        pm_runtime_put(&ifx_dev->spi_dev->dev);
+        }
+
+        spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
+}
+
+/**
+ *      swap_buf
+ *      @buf: our buffer
+ *      @len : number of bytes (not words) in the buffer
+ *      @end: end of buffer
+ *
+ *      Swap the contents of a buffer into big endian format
+ */
+static inline void swap_buf(u16 *buf, int len, void *end)
+{
+        int n;
+
+        len = ((len + 1) >> 1);
+        if ((void *)&buf[len] > end) {
+                pr_err("swap_buf: swap exceeds boundary (%p > %p)!",
+                       &buf[len], end);
+                return;
+        }
+        for (n = 0; n < len; n++) {
+                *buf = cpu_to_be16(*buf);
+                buf++;
+        }
+}
+
+/**
+ *      mrdy_assert             -       assert MRDY line
+ *      @ifx_dev: our SPI device
+ *
+ *      Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low
+ *      now.
+ *
+ *      FIXME: Can SRDY even go high as we are running this code ?
+ */
+static void mrdy_assert(struct ifx_spi_device *ifx_dev)
+{
+        int val = gpio_get_value(ifx_dev->gpio.srdy);
+        if (!val) {
+                if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING,
+                                      &ifx_dev->flags)) {
+                        ifx_dev->spi_timer.expires =
+                                jiffies + IFX_SPI_TIMEOUT_SEC*HZ;
+                        add_timer(&ifx_dev->spi_timer);
+
+                }
+        }
+        ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING);
+        mrdy_set_high(ifx_dev);
+}
+
+/**
+ *      ifx_spi_hangup          -       hang up an IFX device
+ *      @ifx_dev: our SPI device
+ *
+ *      Hang up the tty attached to the IFX device if one is currently
+ *      open. If not take no action
+ */
+static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev)
+{
+        struct tty_port *pport = &ifx_dev->tty_port;
+        struct tty_struct *tty = tty_port_tty_get(pport);
+        if (tty) {
+                tty_hangup(tty);
+                tty_kref_put(tty);
+        }
+}
+
+/**
+ *      ifx_spi_timeout         -       SPI timeout
+ *      @arg: our SPI device
+ *
+ *      The SPI has timed out: hang up the tty. Users will then see a hangup
+ *      and error events.
+ */
+static void ifx_spi_timeout(unsigned long arg)
+{
+        struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg;
+
+        dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");
+        ifx_spi_ttyhangup(ifx_dev);
+        mrdy_set_low(ifx_dev);
+        clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
+}
+
+/* char/tty operations */
+
+/**
+ *      ifx_spi_tiocmget        -       get modem lines
+ *      @tty: our tty device
+ *      @filp: file handle issuing the request
+ *
+ *      Map the signal state into Linux modem flags and report the value
+ *      in Linux terms
+ */
+static int ifx_spi_tiocmget(struct tty_struct *tty)
+{
+        unsigned int value;
+        struct ifx_spi_device *ifx_dev = tty->driver_data;
+
+        value =
+        (test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |
+        (test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |
+        (test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |
+        (test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |
+        (test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |
+        (test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);
+        return value;
+}
+
+/**
+ *      ifx_spi_tiocmset        -       set modem bits
+ *      @tty: the tty structure
+ *      @set: bits to set
+ *      @clear: bits to clear
+ *
+ *      The IFX6x60 only supports DTR and RTS. Set them accordingly
+ *      and flag that an update to the modem is needed.
+ *
+ *      FIXME: do we need to kick the tranfers when we do this ?
+ */
+static int ifx_spi_tiocmset(struct tty_struct *tty,
+                            unsigned int set, unsigned int clear)
+{
+        struct ifx_spi_device *ifx_dev = tty->driver_data;
+
+        if (set & TIOCM_RTS)
+                set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
+        if (set & TIOCM_DTR)
+                set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
+        if (clear & TIOCM_RTS)
+                clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
+        if (clear & TIOCM_DTR)
+                clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
+
+        set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);
+        return 0;
+}
+
+/**
+ *      ifx_spi_open    -       called on tty open
+ *      @tty: our tty device
+ *      @filp: file handle being associated with the tty
+ *
+ *      Open the tty interface. We let the tty_port layer do all the work
+ *      for us.
+ *
+ *      FIXME: Remove single device assumption and saved_ifx_dev
+ */
+static int ifx_spi_open(struct tty_struct *tty, struct file *filp)
+{
+        return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);
+}
+
+/**
+ *      ifx_spi_close   -       called when our tty closes
+ *      @tty: the tty being closed
+ *      @filp: the file handle being closed
+ *
+ *      Perform the close of the tty. We use the tty_port layer to do all
+ *      our hard work.
+ */
+static void ifx_spi_close(struct tty_struct *tty, struct file *filp)
+{
+        struct ifx_spi_device *ifx_dev = tty->driver_data;
+        tty_port_close(&ifx_dev->tty_port, tty, filp);
+        /* FIXME: should we do an ifx_spi_reset here ? */
+}
+
+/**
+ *      ifx_decode_spi_header   -       decode received header
+ *      @buffer: the received data
+ *      @length: decoded length
+ *      @more: decoded more flag
+ *      @received_cts: status of cts we received
+ *
+ *      Note how received_cts is handled -- if header is all F it is left
+ *      the same as it was, if header is all 0 it is set to 0 otherwise it is
+ *      taken from the incoming header.
+ *
+ *      FIXME: endianness
+ */
+static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length,
+                        unsigned char *more, unsigned char *received_cts)
+{
+        u16 h1;
+        u16 h2;
+        u16 *in_buffer = (u16 *)buffer;
+
+        h1 = *in_buffer;
+        h2 = *(in_buffer+1);
+
+        if (h1 == 0 && h2 == 0) {
+                *received_cts = 0;
+                return IFX_SPI_HEADER_0;
+        } else if (h1 == 0xffff && h2 == 0xffff) {
+                /* spi_slave_cts remains as it was */
+                return IFX_SPI_HEADER_F;
+        }
+
+        *length = h1 & 0xfff;   /* upper bits of byte are flags */
+        *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1;
+        *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1;
+        return 0;
+}
+
+/**
+ *      ifx_setup_spi_header    -       set header fields
+ *      @txbuffer: pointer to start of SPI buffer
+ *      @tx_count: bytes
+ *      @more: indicate if more to follow
+ *
+ *      Format up an SPI header for a transfer
+ *
+ *      FIXME: endianness?
+ */
+static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count,
+                                        unsigned char more)
+{
+        *(u16 *)(txbuffer) = tx_count;
+        *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE;
+        txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK;
+}
+
+/**
+ *      ifx_spi_wakeup_serial   -       SPI space made
+ *      @port_data: our SPI device
+ *
+ *      We have emptied the FIFO enough that we want to get more data
+ *      queued into it. Poke the line discipline via tty_wakeup so that
+ *      it will feed us more bits
+ */
+static void ifx_spi_wakeup_serial(struct ifx_spi_device *ifx_dev)
+{
+        struct tty_struct *tty;
+
+        tty = tty_port_tty_get(&ifx_dev->tty_port);
+        if (!tty)
+                return;
+        tty_wakeup(tty);
+        tty_kref_put(tty);
+}
+
+/**
+ *      ifx_spi_prepare_tx_buffer       -       prepare transmit frame
+ *      @ifx_dev: our SPI device
+ *
+ *      The transmit buffr needs a header and various other bits of
+ *      information followed by as much data as we can pull from the FIFO
+ *      and transfer. This function formats up a suitable buffer in the
+ *      ifx_dev->tx_buffer
+ *
+ *      FIXME: performance - should we wake the tty when the queue is half
+ *                           empty ?
+ */
+static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
+{
+        int temp_count;
+        int queue_length;
+        int tx_count;
+        unsigned char *tx_buffer;
+
+        tx_buffer = ifx_dev->tx_buffer;
+        memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
+
+        /* make room for required SPI header */
+        tx_buffer += IFX_SPI_HEADER_OVERHEAD;
+        tx_count = IFX_SPI_HEADER_OVERHEAD;
+
+        /* clear to signal no more data if this turns out to be the
+         * last buffer sent in a sequence */
+        ifx_dev->spi_more = 0;
+
+        /* if modem cts is set, just send empty buffer */
+        if (!ifx_dev->spi_slave_cts) {
+                /* see if there's tx data */
+                queue_length = kfifo_len(&ifx_dev->tx_fifo);
+                if (queue_length != 0) {
+                        /* data to mux -- see if there's room for it */
+                        temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE);
+                        temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,
+                                        tx_buffer, temp_count,
+                                        &ifx_dev->fifo_lock);
+
+                        /* update buffer pointer and data count in message */
+                        tx_buffer += temp_count;
+                        tx_count += temp_count;
+                        if (temp_count == queue_length)
+                                /* poke port to get more data */
+                                ifx_spi_wakeup_serial(ifx_dev);
+                        else /* more data in port, use next SPI message */
+                                ifx_dev->spi_more = 1;
+                }
+        }
+        /* have data and info for header -- set up SPI header in buffer */
+        /* spi header needs payload size, not entire buffer size */
+        ifx_spi_setup_spi_header(ifx_dev->tx_buffer,
+                                        tx_count-IFX_SPI_HEADER_OVERHEAD,
+                                        ifx_dev->spi_more);
+        /* swap actual data in the buffer */
+        swap_buf((u16 *)(ifx_dev->tx_buffer), tx_count,
+                &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);
+        return tx_count;
+}
+
+/**
+ *      ifx_spi_write           -       line discipline write
+ *      @tty: our tty device
+ *      @buf: pointer to buffer to write (kernel space)
+ *      @count: size of buffer
+ *
+ *      Write the characters we have been given into the FIFO. If the device
+ *      is not active then activate it, when the SRDY line is asserted back
+ *      this will commence I/O
+ */
+static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf,
+                         int count)
+{
+        struct ifx_spi_device *ifx_dev = tty->driver_data;
+        unsigned char *tmp_buf = (unsigned char *)buf;
+        int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count,
+                                   &ifx_dev->fifo_lock);
+        mrdy_assert(ifx_dev);
+        return tx_count;
+}
+
+/**
+ *      ifx_spi_chars_in_buffer -       line discipline helper
+ *      @tty: our tty device
+ *
+ *      Report how much data we can accept before we drop bytes. As we use
+ *      a simple FIFO this is nice and easy.
+ */
+static int ifx_spi_write_room(struct tty_struct *tty)
+{
+        struct ifx_spi_device *ifx_dev = tty->driver_data;
+        return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);
+}
+
+/**
+ *      ifx_spi_chars_in_buffer -       line discipline helper
+ *      @tty: our tty device
+ *
+ *      Report how many characters we have buffered. In our case this is the
+ *      number of bytes sitting in our transmit FIFO.
+ */
+static int ifx_spi_chars_in_buffer(struct tty_struct *tty)
+{
+        struct ifx_spi_device *ifx_dev = tty->driver_data;
+        return kfifo_len(&ifx_dev->tx_fifo);
+}
+
+/**
+ *      ifx_port_hangup
+ *      @port: our tty port
+ *
+ *      tty port hang up. Called when tty_hangup processing is invoked either
+ *      by loss of carrier, or by software (eg vhangup). Serialized against
+ *      activate/shutdown by the tty layer.
+ */
+static void ifx_spi_hangup(struct tty_struct *tty)
+{
+        struct ifx_spi_device *ifx_dev = tty->driver_data;
+        tty_port_hangup(&ifx_dev->tty_port);
+}
+
+/**
+ *      ifx_port_activate
+ *      @port: our tty port
+ *
+ *      tty port activate method - called for first open. Serialized
+ *      with hangup and shutdown by the tty layer.
+ */
+static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
+{
+        struct ifx_spi_device *ifx_dev =
+                container_of(port, struct ifx_spi_device, tty_port);
+
+        /* clear any old data; can't do this in 'close' */
+        kfifo_reset(&ifx_dev->tx_fifo);
+
+        /* put port data into this tty */
+        tty->driver_data = ifx_dev;
+
+        /* allows flip string push from int context */
+        tty->low_latency = 1;
+
+        return 0;
+}
+
+/**
+ *      ifx_port_shutdown
+ *      @port: our tty port
+ *
+ *      tty port shutdown method - called for last port close. Serialized
+ *      with hangup and activate by the tty layer.
+ */
+static void ifx_port_shutdown(struct tty_port *port)
+{
+        struct ifx_spi_device *ifx_dev =
+                container_of(port, struct ifx_spi_device, tty_port);
+
+        mrdy_set_low(ifx_dev);
+        clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
+        tasklet_kill(&ifx_dev->io_work_tasklet);
+}
+
+static const struct tty_port_operations ifx_tty_port_ops = {
+        .activate = ifx_port_activate,
+        .shutdown = ifx_port_shutdown,
+};
+
+static const struct tty_operations ifx_spi_serial_ops = {
+        .open = ifx_spi_open,
+        .close = ifx_spi_close,
+        .write = ifx_spi_write,
+        .hangup = ifx_spi_hangup,
+        .write_room = ifx_spi_write_room,
+        .chars_in_buffer = ifx_spi_chars_in_buffer,
+        .tiocmget = ifx_spi_tiocmget,
+        .tiocmset = ifx_spi_tiocmset,
+};
+
+/**
+ *      ifx_spi_insert_fip_string       -       queue received data
+ *      @ifx_ser: our SPI device
+ *      @chars: buffer we have received
+ *      @size: number of chars reeived
+ *
+ *      Queue bytes to the tty assuming the tty side is currently open. If
+ *      not the discard the data.
+ */
+static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
+                                    unsigned char *chars, size_t size)
+{
+        struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
+        if (!tty)
+                return;
+        tty_insert_flip_string(tty, chars, size);
+        tty_flip_buffer_push(tty);
+        tty_kref_put(tty);
+}
+
+/**
+ *      ifx_spi_complete        -       SPI transfer completed
+ *      @ctx: our SPI device
+ *
+ *      An SPI transfer has completed. Process any received data and kick off
+ *      any further transmits we can commence.
+ */
+static void ifx_spi_complete(void *ctx)
+{
+        struct ifx_spi_device *ifx_dev = ctx;
+        struct tty_struct *tty;
+        struct tty_ldisc *ldisc = NULL;
+        int length;
+        int actual_length;
+        unsigned char more;
+        unsigned char cts;
+        int local_write_pending = 0;
+        int queue_length;
+        int srdy;
+        int decode_result;
+
+        mrdy_set_low(ifx_dev);
+
+        if (!ifx_dev->spi_msg.status) {
+                /* check header validity, get comm flags */
+                swap_buf((u16 *)ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,
+                        &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);
+                decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,
+                                &length, &more, &cts);
+                if (decode_result == IFX_SPI_HEADER_0) {
+                        dev_dbg(&ifx_dev->spi_dev->dev,
+                                "ignore input: invalid header 0");
+                        ifx_dev->spi_slave_cts = 0;
+                        goto complete_exit;
+                } else if (decode_result == IFX_SPI_HEADER_F) {
+                        dev_dbg(&ifx_dev->spi_dev->dev,
+                                "ignore input: invalid header F");
+                        goto complete_exit;
+                }
+
+                ifx_dev->spi_slave_cts = cts;
+
+                actual_length = min((unsigned int)length,
+                                        ifx_dev->spi_msg.actual_length);
+                swap_buf((u16 *)(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),
+                         actual_length,
+                         &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);
+                ifx_spi_insert_flip_string(
+                        ifx_dev,
+                        ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,
+                        (size_t)actual_length);
+        } else {
+                dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",
+                       ifx_dev->spi_msg.status);
+        }
+
+complete_exit:
+        if (ifx_dev->write_pending) {
+                ifx_dev->write_pending = 0;
+                local_write_pending = 1;
+        }
+
+        clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));
+
+        queue_length = kfifo_len(&ifx_dev->tx_fifo);
+        srdy = gpio_get_value(ifx_dev->gpio.srdy);
+        if (!srdy)
+                ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY);
+
+        /* schedule output if there is more to do */
+        if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))
+                tasklet_schedule(&ifx_dev->io_work_tasklet);
+        else {
+                if (more || ifx_dev->spi_more || queue_length > 0 ||
+                        local_write_pending) {
+                        if (ifx_dev->spi_slave_cts) {
+                                if (more)
+                                        mrdy_assert(ifx_dev);
+                        } else
+                                mrdy_assert(ifx_dev);
+                } else {
+                        /*
+                         * poke line discipline driver if any for more data
+                         * may or may not get more data to write
+                         * for now, say not busy
+                         */
+                        ifx_spi_power_state_clear(ifx_dev,
+                                                  IFX_SPI_POWER_DATA_PENDING);
+                        tty = tty_port_tty_get(&ifx_dev->tty_port);
+                        if (tty) {
+                                ldisc = tty_ldisc_ref(tty);
+                                if (ldisc) {
+                                        ldisc->ops->write_wakeup(tty);
+                                        tty_ldisc_deref(ldisc);
+                                }
+                                tty_kref_put(tty);
+                        }
+                }
+        }
+}
+
+/**
+ *      ifx_spio_io             -       I/O tasklet
+ *      @data: our SPI device
+ *
+ *      Queue data for transmission if possible and then kick off the
+ *      transfer.
+ */
+static void ifx_spi_io(unsigned long data)
+{
+        int retval;
+        struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data;
+
+        if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) {
+                if (ifx_dev->gpio.unack_srdy_int_nb > 0)
+                        ifx_dev->gpio.unack_srdy_int_nb--;
+
+                ifx_spi_prepare_tx_buffer(ifx_dev);
+
+                spi_message_init(&ifx_dev->spi_msg);
+                INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);
+
+                ifx_dev->spi_msg.context = ifx_dev;
+                ifx_dev->spi_msg.complete = ifx_spi_complete;
+
+                /* set up our spi transfer */
+                /* note len is BYTES, not transfers */
+                ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;
+                ifx_dev->spi_xfer.cs_change = 0;
+                ifx_dev->spi_xfer.speed_hz = ifx_dev->spi_dev->max_speed_hz;
+                /* ifx_dev->spi_xfer.speed_hz = 390625; */
+                ifx_dev->spi_xfer.bits_per_word = spi_bpw;
+
+                ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;
+                ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;
+
+                /*
+                 * setup dma pointers
+                 */
+                if (ifx_dev->use_dma) {
+                        ifx_dev->spi_msg.is_dma_mapped = 1;
+                        ifx_dev->tx_dma = ifx_dev->tx_bus;
+                        ifx_dev->rx_dma = ifx_dev->rx_bus;
+                        ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;
+                        ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;
+                } else {
+                        ifx_dev->spi_msg.is_dma_mapped = 0;
+                        ifx_dev->tx_dma = (dma_addr_t)0;
+                        ifx_dev->rx_dma = (dma_addr_t)0;
+                        ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;
+                        ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;
+                }
+
+                spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);
+
+                /* Assert MRDY. This may have already been done by the write
+                 * routine.
+                 */
+                mrdy_assert(ifx_dev);
+
+                retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);
+                if (retval) {
+                        clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS,
+                                  &ifx_dev->flags);
+                        tasklet_schedule(&ifx_dev->io_work_tasklet);
+                        return;
+                }
+        } else
+                ifx_dev->write_pending = 1;
+}
+
+/**
+ *      ifx_spi_free_port       -       free up the tty side
+ *      @ifx_dev: IFX device going away
+ *
+ *      Unregister and free up a port when the device goes away
+ */
+static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev)
+{
+        if (ifx_dev->tty_dev)
+                tty_unregister_device(tty_drv, ifx_dev->minor);
+        kfifo_free(&ifx_dev->tx_fifo);
+}
+
+/**
+ *      ifx_spi_create_port     -       create a new port
+ *      @ifx_dev: our spi device
+ *
+ *      Allocate and initialise the tty port that goes with this interface
+ *      and add it to the tty layer so that it can be opened.
+ */
+static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev)
+{
+        int ret = 0;
+        struct tty_port *pport = &ifx_dev->tty_port;
+
+        spin_lock_init(&ifx_dev->fifo_lock);
+        lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,
+                &ifx_spi_key, 0);
+
+        if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {
+                ret = -ENOMEM;
+                goto error_ret;
+        }
+
+        tty_port_init(pport);
+        pport->ops = &ifx_tty_port_ops;
+        ifx_dev->minor = IFX_SPI_TTY_ID;
+        ifx_dev->tty_dev = tty_register_device(tty_drv, ifx_dev->minor,
+                                               &ifx_dev->spi_dev->dev);
+        if (IS_ERR(ifx_dev->tty_dev)) {
+                dev_dbg(&ifx_dev->spi_dev->dev,
+                        "%s: registering tty device failed", __func__);
+                ret = PTR_ERR(ifx_dev->tty_dev);
+                goto error_ret;
+        }
+        return 0;
+
+error_ret:
+        ifx_spi_free_port(ifx_dev);
+        return ret;
+}
+
+/**
+ *      ifx_spi_handle_srdy             -       handle SRDY
+ *      @ifx_dev: device asserting SRDY
+ *
+ *      Check our device state and see what we need to kick off when SRDY
+ *      is asserted. This usually means killing the timer and firing off the
+ *      I/O processing.
+ */
+static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev)
+{
+        if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {
+                del_timer_sync(&ifx_dev->spi_timer);
+                clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
+        }
+
+        ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY);
+
+        if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))
+                tasklet_schedule(&ifx_dev->io_work_tasklet);
+        else
+                set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);
+}
+
+/**
+ *      ifx_spi_srdy_interrupt  -       SRDY asserted
+ *      @irq: our IRQ number
+ *      @dev: our ifx device
+ *
+ *      The modem asserted SRDY. Handle the srdy event
+ */
+static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev)
+{
+        struct ifx_spi_device *ifx_dev = dev;
+        ifx_dev->gpio.unack_srdy_int_nb++;
+        ifx_spi_handle_srdy(ifx_dev);
+        return IRQ_HANDLED;
+}
+
+/**
+ *      ifx_spi_reset_interrupt -       Modem has changed reset state
+ *      @irq: interrupt number
+ *      @dev: our device pointer
+ *
+ *      The modem has either entered or left reset state. Check the GPIO
+ *      line to see which.
+ *
+ *      FIXME: review locking on MR_INPROGRESS versus
+ *      parallel unsolicited reset/solicited reset
+ */
+static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev)
+{
+        struct ifx_spi_device *ifx_dev = dev;
+        int val = gpio_get_value(ifx_dev->gpio.reset_out);
+        int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);
+
+        if (val == 0) {
+                /* entered reset */
+                set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
+                if (!solreset) {
+                        /* unsolicited reset  */
+                        ifx_spi_ttyhangup(ifx_dev);
+                }
+        } else {
+                /* exited reset */
+                clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
+                if (solreset) {
+                        set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);
+                        wake_up(&ifx_dev->mdm_reset_wait);
+                }
+        }
+        return IRQ_HANDLED;
+}
+
+/**
+ *      ifx_spi_free_device - free device
+ *      @ifx_dev: device to free
+ *
+ *      Free the IFX device
+ */
+static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev)
+{
+        ifx_spi_free_port(ifx_dev);
+        dma_free_coherent(&ifx_dev->spi_dev->dev,
+                                IFX_SPI_TRANSFER_SIZE,
+                                ifx_dev->tx_buffer,
+                                ifx_dev->tx_bus);
+        dma_free_coherent(&ifx_dev->spi_dev->dev,
+                                IFX_SPI_TRANSFER_SIZE,
+                                ifx_dev->rx_buffer,
+                                ifx_dev->rx_bus);
+}
+
+/**
+ *      ifx_spi_reset   -       reset modem
+ *      @ifx_dev: modem to reset
+ *
+ *      Perform a reset on the modem
+ */
+static int ifx_spi_reset(struct ifx_spi_device *ifx_dev)
+{
+        int ret;
+        /*
+         * set up modem power, reset
+         *
+         * delays are required on some platforms for the modem
+         * to reset properly
+         */
+        set_bit(MR_START, &ifx_dev->mdm_reset_state);
+        gpio_set_value(ifx_dev->gpio.po, 0);
+        gpio_set_value(ifx_dev->gpio.reset, 0);
+        msleep(25);
+        gpio_set_value(ifx_dev->gpio.reset, 1);
+        msleep(1);
+        gpio_set_value(ifx_dev->gpio.po, 1);
+        msleep(1);
+        gpio_set_value(ifx_dev->gpio.po, 0);
+        ret = wait_event_timeout(ifx_dev->mdm_reset_wait,
+                                 test_bit(MR_COMPLETE,
+                                          &ifx_dev->mdm_reset_state),
+                                 IFX_RESET_TIMEOUT);
+        if (!ret)
+                dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",
+                         ifx_dev->mdm_reset_state);
+
+        ifx_dev->mdm_reset_state = 0;
+        return ret;
+}
+
+/**
+ *      ifx_spi_spi_probe       -       probe callback
+ *      @spi: our possible matching SPI device
+ *
+ *      Probe for a 6x60 modem on SPI bus. Perform any needed device and
+ *      GPIO setup.
+ *
+ *      FIXME:
+ *      -       Support for multiple devices
+ *      -       Split out MID specific GPIO handling eventually
+ */
+
+static int ifx_spi_spi_probe(struct spi_device *spi)
+{
+        int ret;
+        int srdy;
+        struct ifx_modem_platform_data *pl_data;
+        struct ifx_spi_device *ifx_dev;
+
+        if (saved_ifx_dev) {
+                dev_dbg(&spi->dev, "ignoring subsequent detection");
+                return -ENODEV;
+        }
+
+        pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data;
+        if (!pl_data) {
+                dev_err(&spi->dev, "missing platform data!");
+                return -ENODEV;
+        }
+
+        /* initialize structure to hold our device variables */
+        ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL);
+        if (!ifx_dev) {
+                dev_err(&spi->dev, "spi device allocation failed");
+                return -ENOMEM;
+        }
+        saved_ifx_dev = ifx_dev;
+        ifx_dev->spi_dev = spi;
+        clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);
+        spin_lock_init(&ifx_dev->write_lock);
+        spin_lock_init(&ifx_dev->power_lock);
+        ifx_dev->power_status = 0;
+        init_timer(&ifx_dev->spi_timer);
+        ifx_dev->spi_timer.function = ifx_spi_timeout;
+        ifx_dev->spi_timer.data = (unsigned long)ifx_dev;
+        ifx_dev->modem = pl_data->modem_type;
+        ifx_dev->use_dma = pl_data->use_dma;
+        ifx_dev->max_hz = pl_data->max_hz;
+        /* initialize spi mode, etc */
+        spi->max_speed_hz = ifx_dev->max_hz;
+        spi->mode = IFX_SPI_MODE | (SPI_LOOP & spi->mode);
+        spi->bits_per_word = spi_bpw;
+        ret = spi_setup(spi);
+        if (ret) {
+                dev_err(&spi->dev, "SPI setup wasn't successful %d", ret);
+                return -ENODEV;
+        }
+
+        /* ensure SPI protocol flags are initialized to enable transfer */
+        ifx_dev->spi_more = 0;
+        ifx_dev->spi_slave_cts = 0;
+
+        /*initialize transfer and dma buffers */
+        ifx_dev->tx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
+                                IFX_SPI_TRANSFER_SIZE,
+                                &ifx_dev->tx_bus,
+                                GFP_KERNEL);
+        if (!ifx_dev->tx_buffer) {
+                dev_err(&spi->dev, "DMA-TX buffer allocation failed");
+                ret = -ENOMEM;
+                goto error_ret;
+        }
+        ifx_dev->rx_buffer = dma_alloc_coherent(ifx_dev->spi_dev->dev.parent,
+                                IFX_SPI_TRANSFER_SIZE,
+                                &ifx_dev->rx_bus,
+                                GFP_KERNEL);
+        if (!ifx_dev->rx_buffer) {
+                dev_err(&spi->dev, "DMA-RX buffer allocation failed");
+                ret = -ENOMEM;
+                goto error_ret;
+        }
+
+        /* initialize waitq for modem reset */
+        init_waitqueue_head(&ifx_dev->mdm_reset_wait);
+
+        spi_set_drvdata(spi, ifx_dev);
+        tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io,
+                                                (unsigned long)ifx_dev);
+
+        set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);
+
+        /* create our tty port */
+        ret = ifx_spi_create_port(ifx_dev);
+        if (ret != 0) {
+                dev_err(&spi->dev, "create default tty port failed");
+                goto error_ret;
+        }
+
+        ifx_dev->gpio.reset = pl_data->rst_pmu;
+        ifx_dev->gpio.po = pl_data->pwr_on;
+        ifx_dev->gpio.mrdy = pl_data->mrdy;
+        ifx_dev->gpio.srdy = pl_data->srdy;
+        ifx_dev->gpio.reset_out = pl_data->rst_out;
+
+        dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d",
+                 ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy,
+                 ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out);
+
+        /* Configure gpios */
+        ret = gpio_request(ifx_dev->gpio.reset, "ifxModem");
+        if (ret < 0) {
+                dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)",
+                        ifx_dev->gpio.reset);
+                goto error_ret;
+        }
+        ret += gpio_direction_output(ifx_dev->gpio.reset, 0);
+        ret += gpio_export(ifx_dev->gpio.reset, 1);
+        if (ret) {
+                dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)",
+                        ifx_dev->gpio.reset);
+                ret = -EBUSY;
+                goto error_ret2;
+        }
+
+        ret = gpio_request(ifx_dev->gpio.po, "ifxModem");
+        ret += gpio_direction_output(ifx_dev->gpio.po, 0);
+        ret += gpio_export(ifx_dev->gpio.po, 1);
+        if (ret) {
+                dev_err(&spi->dev, "Unable to configure GPIO%d (ON)",
+                        ifx_dev->gpio.po);
+                ret = -EBUSY;
+                goto error_ret3;
+        }
+
+        ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem");
+        if (ret < 0) {
+                dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)",
+                        ifx_dev->gpio.mrdy);
+                goto error_ret3;
+        }
+        ret += gpio_export(ifx_dev->gpio.mrdy, 1);
+        ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0);
+        if (ret) {
+                dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)",
+                        ifx_dev->gpio.mrdy);
+                ret = -EBUSY;
+                goto error_ret4;
+        }
+
+        ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem");
+        if (ret < 0) {
+                dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)",
+                        ifx_dev->gpio.srdy);
+                ret = -EBUSY;
+                goto error_ret4;
+        }
+        ret += gpio_export(ifx_dev->gpio.srdy, 1);
+        ret += gpio_direction_input(ifx_dev->gpio.srdy);
+        if (ret) {
+                dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)",
+                        ifx_dev->gpio.srdy);
+                ret = -EBUSY;
+                goto error_ret5;
+        }
+
+        ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem");
+        if (ret < 0) {
+                dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)",
+                        ifx_dev->gpio.reset_out);
+                goto error_ret5;
+        }
+        ret += gpio_export(ifx_dev->gpio.reset_out, 1);
+        ret += gpio_direction_input(ifx_dev->gpio.reset_out);
+        if (ret) {
+                dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)",
+                        ifx_dev->gpio.reset_out);
+                ret = -EBUSY;
+                goto error_ret6;
+        }
+
+        ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out),
+                          ifx_spi_reset_interrupt,
+                          IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME,
+                (void *)ifx_dev);
+        if (ret) {
+                dev_err(&spi->dev, "Unable to get irq %x\n",
+                        gpio_to_irq(ifx_dev->gpio.reset_out));
+                goto error_ret6;
+        }
+
+        ret = ifx_spi_reset(ifx_dev);
+
+        ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy),
+                          ifx_spi_srdy_interrupt,
+                          IRQF_TRIGGER_RISING, DRVNAME,
+                          (void *)ifx_dev);
+        if (ret) {
+                dev_err(&spi->dev, "Unable to get irq %x",
+                        gpio_to_irq(ifx_dev->gpio.srdy));
+                goto error_ret7;
+        }
+
+        /* set pm runtime power state and register with power system */
+        pm_runtime_set_active(&spi->dev);
+        pm_runtime_enable(&spi->dev);
+
+        /* handle case that modem is already signaling SRDY */
+        /* no outgoing tty open at this point, this just satisfies the
+         * modem's read and should reset communication properly
+         */
+        srdy = gpio_get_value(ifx_dev->gpio.srdy);
+
+        if (srdy) {
+                mrdy_assert(ifx_dev);
+                ifx_spi_handle_srdy(ifx_dev);
+        } else
+                mrdy_set_low(ifx_dev);
+        return 0;
+
+error_ret7:
+        free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
+error_ret6:
+        gpio_free(ifx_dev->gpio.srdy);
+error_ret5:
+        gpio_free(ifx_dev->gpio.mrdy);
+error_ret4:
+        gpio_free(ifx_dev->gpio.reset);
+error_ret3:
+        gpio_free(ifx_dev->gpio.po);
+error_ret2:
+        gpio_free(ifx_dev->gpio.reset_out);
+error_ret:
+        ifx_spi_free_device(ifx_dev);
+        saved_ifx_dev = NULL;
+        return ret;
+}
+
+/**
+ *      ifx_spi_spi_remove      -       SPI device was removed
+ *      @spi: SPI device
+ *
+ *      FIXME: We should be shutting the device down here not in
+ *      the module unload path.
+ */
+
+static int ifx_spi_spi_remove(struct spi_device *spi)
+{
+        struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
+        /* stop activity */
+        tasklet_kill(&ifx_dev->io_work_tasklet);
+        /* free irq */
+        free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
+        free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev);
+
+        gpio_free(ifx_dev->gpio.srdy);
+        gpio_free(ifx_dev->gpio.mrdy);
+        gpio_free(ifx_dev->gpio.reset);
+        gpio_free(ifx_dev->gpio.po);
+        gpio_free(ifx_dev->gpio.reset_out);
+
+        /* free allocations */
+        ifx_spi_free_device(ifx_dev);
+
+        saved_ifx_dev = NULL;
+        return 0;
+}
+
+/**
+ *      ifx_spi_spi_shutdown    -       called on SPI shutdown
+ *      @spi: SPI device
+ *
+ *      No action needs to be taken here
+ */
+
+static void ifx_spi_spi_shutdown(struct spi_device *spi)
+{
+}
+
+/*
+ * various suspends and resumes have nothing to do
+ * no hardware to save state for
+ */
+
+/**
+ *      ifx_spi_spi_suspend     -       suspend SPI on system suspend
+ *      @dev: device being suspended
+ *
+ *      Suspend the SPI side. No action needed on Intel MID platforms, may
+ *      need extending for other systems.
+ */
+static int ifx_spi_spi_suspend(struct spi_device *spi, pm_message_t msg)
+{
+        return 0;
+}
+
+/**
+ *      ifx_spi_spi_resume      -       resume SPI side on system resume
+ *      @dev: device being suspended
+ *
+ *      Suspend the SPI side. No action needed on Intel MID platforms, may
+ *      need extending for other systems.
+ */
+static int ifx_spi_spi_resume(struct spi_device *spi)
+{
+        return 0;
+}
+
+/**
+ *      ifx_spi_pm_suspend      -       suspend modem on system suspend
+ *      @dev: device being suspended
+ *
+ *      Suspend the modem. No action needed on Intel MID platforms, may
+ *      need extending for other systems.
+ */
+static int ifx_spi_pm_suspend(struct device *dev)
+{
+        return 0;
+}
+
+/**
+ *      ifx_spi_pm_resume       -       resume modem on system resume
+ *      @dev: device being suspended
+ *
+ *      Allow the modem to resume. No action needed.
+ *
+ *      FIXME: do we need to reset anything here ?
+ */
+static int ifx_spi_pm_resume(struct device *dev)
+{
+        return 0;
+}
+
+/**
+ *      ifx_spi_pm_runtime_resume       -       suspend modem
+ *      @dev: device being suspended
+ *
+ *      Allow the modem to resume. No action needed.
+ */
+static int ifx_spi_pm_runtime_resume(struct device *dev)
+{
+        return 0;
+}
+
+/**
+ *      ifx_spi_pm_runtime_suspend      -       suspend modem
+ *      @dev: device being suspended
+ *
+ *      Allow the modem to suspend and thus suspend to continue up the
+ *      device tree.
+ */
+static int ifx_spi_pm_runtime_suspend(struct device *dev)
+{
+        return 0;
+}
+
+/**
+ *      ifx_spi_pm_runtime_idle         -       check if modem idle
+ *      @dev: our device
+ *
+ *      Check conditions and queue runtime suspend if idle.
+ */
+static int ifx_spi_pm_runtime_idle(struct device *dev)
+{
+        struct spi_device *spi = to_spi_device(dev);
+        struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
+
+        if (!ifx_dev->power_status)
+                pm_runtime_suspend(dev);
+
+        return 0;
+}
+
+static const struct dev_pm_ops ifx_spi_pm = {
+        .resume = ifx_spi_pm_resume,
+        .suspend = ifx_spi_pm_suspend,
+        .runtime_resume = ifx_spi_pm_runtime_resume,
+        .runtime_suspend = ifx_spi_pm_runtime_suspend,
+        .runtime_idle = ifx_spi_pm_runtime_idle
+};
+
+static const struct spi_device_id ifx_id_table[] = {
+        {"ifx6160", 0},
+        {"ifx6260", 0},
+        { }
+};
+MODULE_DEVICE_TABLE(spi, ifx_id_table);
+
+/* spi operations */
+static const struct spi_driver ifx_spi_driver = {
+        .driver = {
+                .name = DRVNAME,
+                .bus = &spi_bus_type,
+                .pm = &ifx_spi_pm,
+                .owner = THIS_MODULE},
+        .probe = ifx_spi_spi_probe,
+        .shutdown = ifx_spi_spi_shutdown,
+        .remove = __devexit_p(ifx_spi_spi_remove),
+        .suspend = ifx_spi_spi_suspend,
+        .resume = ifx_spi_spi_resume,
+        .id_table = ifx_id_table
+};
+
+/**
+ *      ifx_spi_exit    -       module exit
+ *
+ *      Unload the module.
+ */
+
+static void __exit ifx_spi_exit(void)
+{
+        /* unregister */
+        tty_unregister_driver(tty_drv);
+        spi_unregister_driver((void *)&ifx_spi_driver);
+}
+
+/**
+ *      ifx_spi_init            -       module entry point
+ *
+ *      Initialise the SPI and tty interfaces for the IFX SPI driver
+ *      We need to initialize upper-edge spi driver after the tty
+ *      driver because otherwise the spi probe will race
+ */
+
+static int __init ifx_spi_init(void)
+{
+        int result;
+
+        tty_drv = alloc_tty_driver(1);
+        if (!tty_drv) {
+                pr_err("%s: alloc_tty_driver failed", DRVNAME);
+                return -ENOMEM;
+        }
+
+        tty_drv->magic = TTY_DRIVER_MAGIC;
+        tty_drv->owner = THIS_MODULE;
+        tty_drv->driver_name = DRVNAME;
+        tty_drv->name = TTYNAME;
+        tty_drv->minor_start = IFX_SPI_TTY_ID;
+        tty_drv->num = 1;
+        tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
+        tty_drv->subtype = SERIAL_TYPE_NORMAL;
+        tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        tty_drv->init_termios = tty_std_termios;
+
+        tty_set_operations(tty_drv, &ifx_spi_serial_ops);
+
+        result = tty_register_driver(tty_drv);
+        if (result) {
+                pr_err("%s: tty_register_driver failed(%d)",
+                        DRVNAME, result);
+                put_tty_driver(tty_drv);
+                return result;
+        }
+
+        result = spi_register_driver((void *)&ifx_spi_driver);
+        if (result) {
+                pr_err("%s: spi_register_driver failed(%d)",
+                        DRVNAME, result);
+                tty_unregister_driver(tty_drv);
+        }
+        return result;
+}
+
+module_init(ifx_spi_init);
+module_exit(ifx_spi_exit);
+
+MODULE_AUTHOR("Intel");
+MODULE_DESCRIPTION("IFX6x60 spi driver");
+MODULE_LICENSE("GPL");
+MODULE_INFO(Version, "0.1-IFX6x60");
diff --git a/drivers/tty/serial/ifx6x60.h b/drivers/tty/serial/ifx6x60.h
new file mode 100644
index 000000000000..e8464baf9e75
--- /dev/null
+++ b/drivers/tty/serial/ifx6x60.h
@@ -0,0 +1,129 @@
+/****************************************************************************
+ *
+ * Driver for the IFX spi modem.
+ *
+ * Copyright (C) 2009, 2010 Intel Corp
+ * Jim Stanley <jim.stanley@intel.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA
+ *
+ *
+ *
+ *****************************************************************************/
+#ifndef _IFX6X60_H
+#define _IFX6X60_H
+
+#define DRVNAME                         "ifx6x60"
+#define TTYNAME                         "ttyIFX"
+
+#define IFX_SPI_MAX_MINORS              1
+#define IFX_SPI_TRANSFER_SIZE           2048
+#define IFX_SPI_FIFO_SIZE               4096
+
+#define IFX_SPI_HEADER_OVERHEAD         4
+#define IFX_RESET_TIMEOUT               msecs_to_jiffies(50)
+
+/* device flags bitfield definitions */
+#define IFX_SPI_STATE_PRESENT           0
+#define IFX_SPI_STATE_IO_IN_PROGRESS    1
+#define IFX_SPI_STATE_IO_READY          2
+#define IFX_SPI_STATE_TIMER_PENDING     3
+
+/* flow control bitfields */
+#define IFX_SPI_DCD                     0
+#define IFX_SPI_CTS                     1
+#define IFX_SPI_DSR                     2
+#define IFX_SPI_RI                      3
+#define IFX_SPI_DTR                     4
+#define IFX_SPI_RTS                     5
+#define IFX_SPI_TX_FC                   6
+#define IFX_SPI_RX_FC                   7
+#define IFX_SPI_UPDATE                  8
+
+#define IFX_SPI_PAYLOAD_SIZE            (IFX_SPI_TRANSFER_SIZE - \
+                                                IFX_SPI_HEADER_OVERHEAD)
+
+#define IFX_SPI_IRQ_TYPE                DETECT_EDGE_RISING
+#define IFX_SPI_GPIO_TARGET             0
+#define IFX_SPI_GPIO0                   0x105
+
+#define IFX_SPI_STATUS_TIMEOUT          (2000*HZ)
+
+/* values for bits in power status byte */
+#define IFX_SPI_POWER_DATA_PENDING      1
+#define IFX_SPI_POWER_SRDY              2
+
+struct ifx_spi_device {
+        /* Our SPI device */
+        struct spi_device *spi_dev;
+
+        /* Port specific data */
+        struct kfifo tx_fifo;
+        spinlock_t fifo_lock;
+        unsigned long signal_state;
+
+        /* TTY Layer logic */
+        struct tty_port tty_port;
+        struct device *tty_dev;
+        int minor;
+
+        /* Low level I/O work */
+        struct tasklet_struct io_work_tasklet;
+        unsigned long flags;
+        dma_addr_t rx_dma;
+        dma_addr_t tx_dma;
+
+        int modem;              /* Modem type */
+        int use_dma;            /* provide dma-able addrs in SPI msg */
+        long max_hz;            /* max SPI frequency */
+
+        spinlock_t write_lock;
+        int write_pending;
+        spinlock_t power_lock;
+        unsigned char power_status;
+
+        unsigned char *rx_buffer;
+        unsigned char *tx_buffer;
+        dma_addr_t rx_bus;
+        dma_addr_t tx_bus;
+        unsigned char spi_more;
+        unsigned char spi_slave_cts;
+
+        struct timer_list spi_timer;
+
+        struct spi_message spi_msg;
+        struct spi_transfer spi_xfer;
+
+        struct {
+                /* gpio lines */
+                unsigned short srdy;            /* slave-ready gpio */
+                unsigned short mrdy;            /* master-ready gpio */
+                unsigned short reset;           /* modem-reset gpio */
+                unsigned short po;              /* modem-on gpio */
+                unsigned short reset_out;       /* modem-in-reset gpio */
+                /* state/stats */
+                int unack_srdy_int_nb;
+        } gpio;
+
+        /* modem reset */
+        unsigned long mdm_reset_state;
+#define MR_START        0
+#define MR_INPROGRESS   1
+#define MR_COMPLETE     2
+        wait_queue_head_t mdm_reset_wait;
+};
+
+#endif /* _IFX6X60_H */
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
new file mode 100644
index 000000000000..a54473123e0a
--- /dev/null
+++ b/drivers/tty/serial/imx.c
@@ -0,0 +1,1379 @@
+/*
+ *  Driver for Motorola IMX serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Author: Sascha Hauer <sascha@saschahauer.de>
+ *  Copyright (C) 2004 Pengutronix
+ *
+ *  Copyright (C) 2009 emlix GmbH
+ *  Author: Fabian Godehardt (added IrDA support for iMX)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * [29-Mar-2005] Mike Lee
+ * Added hardware handshake
+ */
+
+#if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/rational.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <mach/imx-uart.h>
+
+/* Register definitions */
+#define URXD0 0x0  /* Receiver Register */
+#define URTX0 0x40 /* Transmitter Register */
+#define UCR1  0x80 /* Control Register 1 */
+#define UCR2  0x84 /* Control Register 2 */
+#define UCR3  0x88 /* Control Register 3 */
+#define UCR4  0x8c /* Control Register 4 */
+#define UFCR  0x90 /* FIFO Control Register */
+#define USR1  0x94 /* Status Register 1 */
+#define USR2  0x98 /* Status Register 2 */
+#define UESC  0x9c /* Escape Character Register */
+#define UTIM  0xa0 /* Escape Timer Register */
+#define UBIR  0xa4 /* BRM Incremental Register */
+#define UBMR  0xa8 /* BRM Modulator Register */
+#define UBRC  0xac /* Baud Rate Count Register */
+#define MX2_ONEMS 0xb0 /* One Millisecond register */
+#define UTS (cpu_is_mx1() ? 0xd0 : 0xb4) /* UART Test Register */
+
+/* UART Control Register Bit Fields.*/
+#define  URXD_CHARRDY    (1<<15)
+#define  URXD_ERR        (1<<14)
+#define  URXD_OVRRUN     (1<<13)
+#define  URXD_FRMERR     (1<<12)
+#define  URXD_BRK        (1<<11)
+#define  URXD_PRERR      (1<<10)
+#define  UCR1_ADEN       (1<<15) /* Auto detect interrupt */
+#define  UCR1_ADBR       (1<<14) /* Auto detect baud rate */
+#define  UCR1_TRDYEN     (1<<13) /* Transmitter ready interrupt enable */
+#define  UCR1_IDEN       (1<<12) /* Idle condition interrupt */
+#define  UCR1_RRDYEN     (1<<9)  /* Recv ready interrupt enable */
+#define  UCR1_RDMAEN     (1<<8)  /* Recv ready DMA enable */
+#define  UCR1_IREN       (1<<7)  /* Infrared interface enable */
+#define  UCR1_TXMPTYEN   (1<<6)  /* Transimitter empty interrupt enable */
+#define  UCR1_RTSDEN     (1<<5)  /* RTS delta interrupt enable */
+#define  UCR1_SNDBRK     (1<<4)  /* Send break */
+#define  UCR1_TDMAEN     (1<<3)  /* Transmitter ready DMA enable */
+#define  MX1_UCR1_UARTCLKEN  (1<<2)      /* UART clock enabled, mx1 only */
+#define  UCR1_DOZE       (1<<1)  /* Doze */
+#define  UCR1_UARTEN     (1<<0)  /* UART enabled */
+#define  UCR2_ESCI       (1<<15) /* Escape seq interrupt enable */
+#define  UCR2_IRTS       (1<<14) /* Ignore RTS pin */
+#define  UCR2_CTSC       (1<<13) /* CTS pin control */
+#define  UCR2_CTS        (1<<12) /* Clear to send */
+#define  UCR2_ESCEN      (1<<11) /* Escape enable */
+#define  UCR2_PREN       (1<<8)  /* Parity enable */
+#define  UCR2_PROE       (1<<7)  /* Parity odd/even */
+#define  UCR2_STPB       (1<<6)  /* Stop */
+#define  UCR2_WS         (1<<5)  /* Word size */
+#define  UCR2_RTSEN      (1<<4)  /* Request to send interrupt enable */
+#define  UCR2_TXEN       (1<<2)  /* Transmitter enabled */
+#define  UCR2_RXEN       (1<<1)  /* Receiver enabled */
+#define  UCR2_SRST       (1<<0)  /* SW reset */
+#define  UCR3_DTREN      (1<<13) /* DTR interrupt enable */
+#define  UCR3_PARERREN   (1<<12) /* Parity enable */
+#define  UCR3_FRAERREN   (1<<11) /* Frame error interrupt enable */
+#define  UCR3_DSR        (1<<10) /* Data set ready */
+#define  UCR3_DCD        (1<<9)  /* Data carrier detect */
+#define  UCR3_RI         (1<<8)  /* Ring indicator */
+#define  UCR3_TIMEOUTEN  (1<<7)  /* Timeout interrupt enable */
+#define  UCR3_RXDSEN     (1<<6)  /* Receive status interrupt enable */
+#define  UCR3_AIRINTEN   (1<<5)  /* Async IR wake interrupt enable */
+#define  UCR3_AWAKEN     (1<<4)  /* Async wake interrupt enable */
+#define  MX1_UCR3_REF25          (1<<3)  /* Ref freq 25 MHz, only on mx1 */
+#define  MX1_UCR3_REF30          (1<<2)  /* Ref Freq 30 MHz, only on mx1 */
+#define  MX2_UCR3_RXDMUXSEL      (1<<2)  /* RXD Muxed Input Select, on mx2/mx3 */
+#define  UCR3_INVT       (1<<1)  /* Inverted Infrared transmission */
+#define  UCR3_BPEN       (1<<0)  /* Preset registers enable */
+#define  UCR4_CTSTL_SHF  10      /* CTS trigger level shift */
+#define  UCR4_CTSTL_MASK 0x3F    /* CTS trigger is 6 bits wide */
+#define  UCR4_INVR       (1<<9)  /* Inverted infrared reception */
+#define  UCR4_ENIRI      (1<<8)  /* Serial infrared interrupt enable */
+#define  UCR4_WKEN       (1<<7)  /* Wake interrupt enable */
+#define  UCR4_REF16      (1<<6)  /* Ref freq 16 MHz */
+#define  UCR4_IRSC       (1<<5)  /* IR special case */
+#define  UCR4_TCEN       (1<<3)  /* Transmit complete interrupt enable */
+#define  UCR4_BKEN       (1<<2)  /* Break condition interrupt enable */
+#define  UCR4_OREN       (1<<1)  /* Receiver overrun interrupt enable */
+#define  UCR4_DREN       (1<<0)  /* Recv data ready interrupt enable */
+#define  UFCR_RXTL_SHF   0       /* Receiver trigger level shift */
+#define  UFCR_RFDIV      (7<<7)  /* Reference freq divider mask */
+#define  UFCR_RFDIV_REG(x)      (((x) < 7 ? 6 - (x) : 6) << 7)
+#define  UFCR_TXTL_SHF   10      /* Transmitter trigger level shift */
+#define  USR1_PARITYERR  (1<<15) /* Parity error interrupt flag */
+#define  USR1_RTSS       (1<<14) /* RTS pin status */
+#define  USR1_TRDY       (1<<13) /* Transmitter ready interrupt/dma flag */
+#define  USR1_RTSD       (1<<12) /* RTS delta */
+#define  USR1_ESCF       (1<<11) /* Escape seq interrupt flag */
+#define  USR1_FRAMERR    (1<<10) /* Frame error interrupt flag */
+#define  USR1_RRDY       (1<<9)  /* Receiver ready interrupt/dma flag */
+#define  USR1_TIMEOUT    (1<<7)  /* Receive timeout interrupt status */
+#define  USR1_RXDS       (1<<6)  /* Receiver idle interrupt flag */
+#define  USR1_AIRINT     (1<<5)  /* Async IR wake interrupt flag */
+#define  USR1_AWAKE      (1<<4)  /* Aysnc wake interrupt flag */
+#define  USR2_ADET       (1<<15) /* Auto baud rate detect complete */
+#define  USR2_TXFE       (1<<14) /* Transmit buffer FIFO empty */
+#define  USR2_DTRF       (1<<13) /* DTR edge interrupt flag */
+#define  USR2_IDLE       (1<<12) /* Idle condition */
+#define  USR2_IRINT      (1<<8)  /* Serial infrared interrupt flag */
+#define  USR2_WAKE       (1<<7)  /* Wake */
+#define  USR2_RTSF       (1<<4)  /* RTS edge interrupt flag */
+#define  USR2_TXDC       (1<<3)  /* Transmitter complete */
+#define  USR2_BRCD       (1<<2)  /* Break condition */
+#define  USR2_ORE        (1<<1)  /* Overrun error */
+#define  USR2_RDR        (1<<0)  /* Recv data ready */
+#define  UTS_FRCPERR     (1<<13) /* Force parity error */
+#define  UTS_LOOP        (1<<12) /* Loop tx and rx */
+#define  UTS_TXEMPTY     (1<<6)  /* TxFIFO empty */
+#define  UTS_RXEMPTY     (1<<5)  /* RxFIFO empty */
+#define  UTS_TXFULL      (1<<4)  /* TxFIFO full */
+#define  UTS_RXFULL      (1<<3)  /* RxFIFO full */
+#define  UTS_SOFTRST     (1<<0)  /* Software reset */
+
+/* We've been assigned a range on the "Low-density serial ports" major */
+#define SERIAL_IMX_MAJOR        207
+#define MINOR_START             16
+#define DEV_NAME                "ttymxc"
+#define MAX_INTERNAL_IRQ        MXC_INTERNAL_IRQS
+
+/*
+ * This determines how often we check the modem status signals
+ * for any change.  They generally aren't connected to an IRQ
+ * so we have to poll them.  We also check immediately before
+ * filling the TX fifo incase CTS has been dropped.
+ */
+#define MCTRL_TIMEOUT   (250*HZ/1000)
+
+#define DRIVER_NAME "IMX-uart"
+
+#define UART_NR 8
+
+struct imx_port {
+        struct uart_port        port;
+        struct timer_list       timer;
+        unsigned int            old_status;
+        int                     txirq,rxirq,rtsirq;
+        unsigned int            have_rtscts:1;
+        unsigned int            use_irda:1;
+        unsigned int            irda_inv_rx:1;
+        unsigned int            irda_inv_tx:1;
+        unsigned short          trcv_delay; /* transceiver delay */
+        struct clk              *clk;
+};
+
+#ifdef CONFIG_IRDA
+#define USE_IRDA(sport) ((sport)->use_irda)
+#else
+#define USE_IRDA(sport) (0)
+#endif
+
+/*
+ * Handle any change of modem status signal since we were last called.
+ */
+static void imx_mctrl_check(struct imx_port *sport)
+{
+        unsigned int status, changed;
+
+        status = sport->port.ops->get_mctrl(&sport->port);
+        changed = status ^ sport->old_status;
+
+        if (changed == 0)
+                return;
+
+        sport->old_status = status;
+
+        if (changed & TIOCM_RI)
+                sport->port.icount.rng++;
+        if (changed & TIOCM_DSR)
+                sport->port.icount.dsr++;
+        if (changed & TIOCM_CAR)
+                uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
+        if (changed & TIOCM_CTS)
+                uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
+
+        wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
+}
+
+/*
+ * This is our per-port timeout handler, for checking the
+ * modem status signals.
+ */
+static void imx_timeout(unsigned long data)
+{
+        struct imx_port *sport = (struct imx_port *)data;
+        unsigned long flags;
+
+        if (sport->port.state) {
+                spin_lock_irqsave(&sport->port.lock, flags);
+                imx_mctrl_check(sport);
+                spin_unlock_irqrestore(&sport->port.lock, flags);
+
+                mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
+        }
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void imx_stop_tx(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned long temp;
+
+        if (USE_IRDA(sport)) {
+                /* half duplex - wait for end of transmission */
+                int n = 256;
+                while ((--n > 0) &&
+                      !(readl(sport->port.membase + USR2) & USR2_TXDC)) {
+                        udelay(5);
+                        barrier();
+                }
+                /*
+                 * irda transceiver - wait a bit more to avoid
+                 * cutoff, hardware dependent
+                 */
+                udelay(sport->trcv_delay);
+
+                /*
+                 * half duplex - reactivate receive mode,
+                 * flush receive pipe echo crap
+                 */
+                if (readl(sport->port.membase + USR2) & USR2_TXDC) {
+                        temp = readl(sport->port.membase + UCR1);
+                        temp &= ~(UCR1_TXMPTYEN | UCR1_TRDYEN);
+                        writel(temp, sport->port.membase + UCR1);
+
+                        temp = readl(sport->port.membase + UCR4);
+                        temp &= ~(UCR4_TCEN);
+                        writel(temp, sport->port.membase + UCR4);
+
+                        while (readl(sport->port.membase + URXD0) &
+                               URXD_CHARRDY)
+                                barrier();
+
+                        temp = readl(sport->port.membase + UCR1);
+                        temp |= UCR1_RRDYEN;
+                        writel(temp, sport->port.membase + UCR1);
+
+                        temp = readl(sport->port.membase + UCR4);
+                        temp |= UCR4_DREN;
+                        writel(temp, sport->port.membase + UCR4);
+                }
+                return;
+        }
+
+        temp = readl(sport->port.membase + UCR1);
+        writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1);
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void imx_stop_rx(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned long temp;
+
+        temp = readl(sport->port.membase + UCR2);
+        writel(temp &~ UCR2_RXEN, sport->port.membase + UCR2);
+}
+
+/*
+ * Set the modem control timer to fire immediately.
+ */
+static void imx_enable_ms(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+
+        mod_timer(&sport->timer, jiffies);
+}
+
+static inline void imx_transmit_buffer(struct imx_port *sport)
+{
+        struct circ_buf *xmit = &sport->port.state->xmit;
+
+        while (!uart_circ_empty(xmit) &&
+                        !(readl(sport->port.membase + UTS) & UTS_TXFULL)) {
+                /* send xmit->buf[xmit->tail]
+                 * out the port here */
+                writel(xmit->buf[xmit->tail], sport->port.membase + URTX0);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                sport->port.icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&sport->port);
+
+        if (uart_circ_empty(xmit))
+                imx_stop_tx(&sport->port);
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void imx_start_tx(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned long temp;
+
+        if (USE_IRDA(sport)) {
+                /* half duplex in IrDA mode; have to disable receive mode */
+                temp = readl(sport->port.membase + UCR4);
+                temp &= ~(UCR4_DREN);
+                writel(temp, sport->port.membase + UCR4);
+
+                temp = readl(sport->port.membase + UCR1);
+                temp &= ~(UCR1_RRDYEN);
+                writel(temp, sport->port.membase + UCR1);
+        }
+
+        temp = readl(sport->port.membase + UCR1);
+        writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
+
+        if (USE_IRDA(sport)) {
+                temp = readl(sport->port.membase + UCR1);
+                temp |= UCR1_TRDYEN;
+                writel(temp, sport->port.membase + UCR1);
+
+                temp = readl(sport->port.membase + UCR4);
+                temp |= UCR4_TCEN;
+                writel(temp, sport->port.membase + UCR4);
+        }
+
+        if (readl(sport->port.membase + UTS) & UTS_TXEMPTY)
+                imx_transmit_buffer(sport);
+}
+
+static irqreturn_t imx_rtsint(int irq, void *dev_id)
+{
+        struct imx_port *sport = dev_id;
+        unsigned int val;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sport->port.lock, flags);
+
+        writel(USR1_RTSD, sport->port.membase + USR1);
+        val = readl(sport->port.membase + USR1) & USR1_RTSS;
+        uart_handle_cts_change(&sport->port, !!val);
+        wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
+
+        spin_unlock_irqrestore(&sport->port.lock, flags);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t imx_txint(int irq, void *dev_id)
+{
+        struct imx_port *sport = dev_id;
+        struct circ_buf *xmit = &sport->port.state->xmit;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sport->port.lock,flags);
+        if (sport->port.x_char)
+        {
+                /* Send next char */
+                writel(sport->port.x_char, sport->port.membase + URTX0);
+                goto out;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+                imx_stop_tx(&sport->port);
+                goto out;
+        }
+
+        imx_transmit_buffer(sport);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&sport->port);
+
+out:
+        spin_unlock_irqrestore(&sport->port.lock,flags);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t imx_rxint(int irq, void *dev_id)
+{
+        struct imx_port *sport = dev_id;
+        unsigned int rx,flg,ignored = 0;
+        struct tty_struct *tty = sport->port.state->port.tty;
+        unsigned long flags, temp;
+
+        spin_lock_irqsave(&sport->port.lock,flags);
+
+        while (readl(sport->port.membase + USR2) & USR2_RDR) {
+                flg = TTY_NORMAL;
+                sport->port.icount.rx++;
+
+                rx = readl(sport->port.membase + URXD0);
+
+                temp = readl(sport->port.membase + USR2);
+                if (temp & USR2_BRCD) {
+                        writel(USR2_BRCD, sport->port.membase + USR2);
+                        if (uart_handle_break(&sport->port))
+                                continue;
+                }
+
+                if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
+                        continue;
+
+                if (rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) {
+                        if (rx & URXD_PRERR)
+                                sport->port.icount.parity++;
+                        else if (rx & URXD_FRMERR)
+                                sport->port.icount.frame++;
+                        if (rx & URXD_OVRRUN)
+                                sport->port.icount.overrun++;
+
+                        if (rx & sport->port.ignore_status_mask) {
+                                if (++ignored > 100)
+                                        goto out;
+                                continue;
+                        }
+
+                        rx &= sport->port.read_status_mask;
+
+                        if (rx & URXD_PRERR)
+                                flg = TTY_PARITY;
+                        else if (rx & URXD_FRMERR)
+                                flg = TTY_FRAME;
+                        if (rx & URXD_OVRRUN)
+                                flg = TTY_OVERRUN;
+
+#ifdef SUPPORT_SYSRQ
+                        sport->port.sysrq = 0;
+#endif
+                }
+
+                tty_insert_flip_char(tty, rx, flg);
+        }
+
+out:
+        spin_unlock_irqrestore(&sport->port.lock,flags);
+        tty_flip_buffer_push(tty);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t imx_int(int irq, void *dev_id)
+{
+        struct imx_port *sport = dev_id;
+        unsigned int sts;
+
+        sts = readl(sport->port.membase + USR1);
+
+        if (sts & USR1_RRDY)
+                imx_rxint(irq, dev_id);
+
+        if (sts & USR1_TRDY &&
+                        readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN)
+                imx_txint(irq, dev_id);
+
+        if (sts & USR1_RTSD)
+                imx_rtsint(irq, dev_id);
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter is not busy.
+ */
+static unsigned int imx_tx_empty(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+
+        return (readl(sport->port.membase + USR2) & USR2_TXDC) ?  TIOCSER_TEMT : 0;
+}
+
+/*
+ * We have a modem side uart, so the meanings of RTS and CTS are inverted.
+ */
+static unsigned int imx_get_mctrl(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
+
+        if (readl(sport->port.membase + USR1) & USR1_RTSS)
+                tmp |= TIOCM_CTS;
+
+        if (readl(sport->port.membase + UCR2) & UCR2_CTS)
+                tmp |= TIOCM_RTS;
+
+        return tmp;
+}
+
+static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned long temp;
+
+        temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;
+
+        if (mctrl & TIOCM_RTS)
+                temp |= UCR2_CTS;
+
+        writel(temp, sport->port.membase + UCR2);
+}
+
+/*
+ * Interrupts always disabled.
+ */
+static void imx_break_ctl(struct uart_port *port, int break_state)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned long flags, temp;
+
+        spin_lock_irqsave(&sport->port.lock, flags);
+
+        temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK;
+
+        if ( break_state != 0 )
+                temp |= UCR1_SNDBRK;
+
+        writel(temp, sport->port.membase + UCR1);
+
+        spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+#define TXTL 2 /* reset default */
+#define RXTL 1 /* reset default */
+
+static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
+{
+        unsigned int val;
+        unsigned int ufcr_rfdiv;
+
+        /* set receiver / transmitter trigger level.
+         * RFDIV is set such way to satisfy requested uartclk value
+         */
+        val = TXTL << 10 | RXTL;
+        ufcr_rfdiv = (clk_get_rate(sport->clk) + sport->port.uartclk / 2)
+                        / sport->port.uartclk;
+
+        if(!ufcr_rfdiv)
+                ufcr_rfdiv = 1;
+
+        val |= UFCR_RFDIV_REG(ufcr_rfdiv);
+
+        writel(val, sport->port.membase + UFCR);
+
+        return 0;
+}
+
+/* half the RX buffer size */
+#define CTSTL 16
+
+static int imx_startup(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        int retval;
+        unsigned long flags, temp;
+
+        imx_setup_ufcr(sport, 0);
+
+        /* disable the DREN bit (Data Ready interrupt enable) before
+         * requesting IRQs
+         */
+        temp = readl(sport->port.membase + UCR4);
+
+        if (USE_IRDA(sport))
+                temp |= UCR4_IRSC;
+
+        /* set the trigger level for CTS */
+        temp &= ~(UCR4_CTSTL_MASK<<  UCR4_CTSTL_SHF);
+        temp |= CTSTL<<  UCR4_CTSTL_SHF;
+
+        writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
+
+        if (USE_IRDA(sport)) {
+                /* reset fifo's and state machines */
+                int i = 100;
+                temp = readl(sport->port.membase + UCR2);
+                temp &= ~UCR2_SRST;
+                writel(temp, sport->port.membase + UCR2);
+                while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) &&
+                    (--i > 0)) {
+                        udelay(1);
+                }
+        }
+
+        /*
+         * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
+         * chips only have one interrupt.
+         */
+        if (sport->txirq > 0) {
+                retval = request_irq(sport->rxirq, imx_rxint, 0,
+                                DRIVER_NAME, sport);
+                if (retval)
+                        goto error_out1;
+
+                retval = request_irq(sport->txirq, imx_txint, 0,
+                                DRIVER_NAME, sport);
+                if (retval)
+                        goto error_out2;
+
+                /* do not use RTS IRQ on IrDA */
+                if (!USE_IRDA(sport)) {
+                        retval = request_irq(sport->rtsirq, imx_rtsint,
+                                     (sport->rtsirq < MAX_INTERNAL_IRQ) ? 0 :
+                                       IRQF_TRIGGER_FALLING |
+                                       IRQF_TRIGGER_RISING,
+                                        DRIVER_NAME, sport);
+                        if (retval)
+                                goto error_out3;
+                }
+        } else {
+                retval = request_irq(sport->port.irq, imx_int, 0,
+                                DRIVER_NAME, sport);
+                if (retval) {
+                        free_irq(sport->port.irq, sport);
+                        goto error_out1;
+                }
+        }
+
+        /*
+         * Finally, clear and enable interrupts
+         */
+        writel(USR1_RTSD, sport->port.membase + USR1);
+
+        temp = readl(sport->port.membase + UCR1);
+        temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
+
+        if (USE_IRDA(sport)) {
+                temp |= UCR1_IREN;
+                temp &= ~(UCR1_RTSDEN);
+        }
+
+        writel(temp, sport->port.membase + UCR1);
+
+        temp = readl(sport->port.membase + UCR2);
+        temp |= (UCR2_RXEN | UCR2_TXEN);
+        writel(temp, sport->port.membase + UCR2);
+
+        if (USE_IRDA(sport)) {
+                /* clear RX-FIFO */
+                int i = 64;
+                while ((--i > 0) &&
+                        (readl(sport->port.membase + URXD0) & URXD_CHARRDY)) {
+                        barrier();
+                }
+        }
+
+        if (!cpu_is_mx1()) {
+                temp = readl(sport->port.membase + UCR3);
+                temp |= MX2_UCR3_RXDMUXSEL;
+                writel(temp, sport->port.membase + UCR3);
+        }
+
+        if (USE_IRDA(sport)) {
+                temp = readl(sport->port.membase + UCR4);
+                if (sport->irda_inv_rx)
+                        temp |= UCR4_INVR;
+                else
+                        temp &= ~(UCR4_INVR);
+                writel(temp | UCR4_DREN, sport->port.membase + UCR4);
+
+                temp = readl(sport->port.membase + UCR3);
+                if (sport->irda_inv_tx)
+                        temp |= UCR3_INVT;
+                else
+                        temp &= ~(UCR3_INVT);
+                writel(temp, sport->port.membase + UCR3);
+        }
+
+        /*
+         * Enable modem status interrupts
+         */
+        spin_lock_irqsave(&sport->port.lock,flags);
+        imx_enable_ms(&sport->port);
+        spin_unlock_irqrestore(&sport->port.lock,flags);
+
+        if (USE_IRDA(sport)) {
+                struct imxuart_platform_data *pdata;
+                pdata = sport->port.dev->platform_data;
+                sport->irda_inv_rx = pdata->irda_inv_rx;
+                sport->irda_inv_tx = pdata->irda_inv_tx;
+                sport->trcv_delay = pdata->transceiver_delay;
+                if (pdata->irda_enable)
+                        pdata->irda_enable(1);
+        }
+
+        return 0;
+
+error_out3:
+        if (sport->txirq)
+                free_irq(sport->txirq, sport);
+error_out2:
+        if (sport->rxirq)
+                free_irq(sport->rxirq, sport);
+error_out1:
+        return retval;
+}
+
+static void imx_shutdown(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned long temp;
+
+        temp = readl(sport->port.membase + UCR2);
+        temp &= ~(UCR2_TXEN);
+        writel(temp, sport->port.membase + UCR2);
+
+        if (USE_IRDA(sport)) {
+                struct imxuart_platform_data *pdata;
+                pdata = sport->port.dev->platform_data;
+                if (pdata->irda_enable)
+                        pdata->irda_enable(0);
+        }
+
+        /*
+         * Stop our timer.
+         */
+        del_timer_sync(&sport->timer);
+
+        /*
+         * Free the interrupts
+         */
+        if (sport->txirq > 0) {
+                if (!USE_IRDA(sport))
+                        free_irq(sport->rtsirq, sport);
+                free_irq(sport->txirq, sport);
+                free_irq(sport->rxirq, sport);
+        } else
+                free_irq(sport->port.irq, sport);
+
+        /*
+         * Disable all interrupts, port and break condition.
+         */
+
+        temp = readl(sport->port.membase + UCR1);
+        temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
+        if (USE_IRDA(sport))
+                temp &= ~(UCR1_IREN);
+
+        writel(temp, sport->port.membase + UCR1);
+}
+
+static void
+imx_set_termios(struct uart_port *port, struct ktermios *termios,
+                   struct ktermios *old)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        unsigned long flags;
+        unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
+        unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
+        unsigned int div, ufcr;
+        unsigned long num, denom;
+        uint64_t tdiv64;
+
+        /*
+         * If we don't support modem control lines, don't allow
+         * these to be set.
+         */
+        if (0) {
+                termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
+                termios->c_cflag |= CLOCAL;
+        }
+
+        /*
+         * We only support CS7 and CS8.
+         */
+        while ((termios->c_cflag & CSIZE) != CS7 &&
+               (termios->c_cflag & CSIZE) != CS8) {
+                termios->c_cflag &= ~CSIZE;
+                termios->c_cflag |= old_csize;
+                old_csize = CS8;
+        }
+
+        if ((termios->c_cflag & CSIZE) == CS8)
+                ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
+        else
+                ucr2 = UCR2_SRST | UCR2_IRTS;
+
+        if (termios->c_cflag & CRTSCTS) {
+                if( sport->have_rtscts ) {
+                        ucr2 &= ~UCR2_IRTS;
+                        ucr2 |= UCR2_CTSC;
+                } else {
+                        termios->c_cflag &= ~CRTSCTS;
+                }
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                ucr2 |= UCR2_STPB;
+        if (termios->c_cflag & PARENB) {
+                ucr2 |= UCR2_PREN;
+                if (termios->c_cflag & PARODD)
+                        ucr2 |= UCR2_PROE;
+        }
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
+        quot = uart_get_divisor(port, baud);
+
+        spin_lock_irqsave(&sport->port.lock, flags);
+
+        sport->port.read_status_mask = 0;
+        if (termios->c_iflag & INPCK)
+                sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                sport->port.read_status_mask |= URXD_BRK;
+
+        /*
+         * Characters to ignore
+         */
+        sport->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                sport->port.ignore_status_mask |= URXD_PRERR;
+        if (termios->c_iflag & IGNBRK) {
+                sport->port.ignore_status_mask |= URXD_BRK;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        sport->port.ignore_status_mask |= URXD_OVRRUN;
+        }
+
+        del_timer_sync(&sport->timer);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /*
+         * disable interrupts and drain transmitter
+         */
+        old_ucr1 = readl(sport->port.membase + UCR1);
+        writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
+                        sport->port.membase + UCR1);
+
+        while ( !(readl(sport->port.membase + USR2) & USR2_TXDC))
+                barrier();
+
+        /* then, disable everything */
+        old_txrxen = readl(sport->port.membase + UCR2);
+        writel(old_txrxen & ~( UCR2_TXEN | UCR2_RXEN),
+                        sport->port.membase + UCR2);
+        old_txrxen &= (UCR2_TXEN | UCR2_RXEN);
+
+        if (USE_IRDA(sport)) {
+                /*
+                 * use maximum available submodule frequency to
+                 * avoid missing short pulses due to low sampling rate
+                 */
+                div = 1;
+        } else {
+                div = sport->port.uartclk / (baud * 16);
+                if (div > 7)
+                        div = 7;
+                if (!div)
+                        div = 1;
+        }
+
+        rational_best_approximation(16 * div * baud, sport->port.uartclk,
+                1 << 16, 1 << 16, &num, &denom);
+
+        tdiv64 = sport->port.uartclk;
+        tdiv64 *= num;
+        do_div(tdiv64, denom * 16 * div);
+        tty_termios_encode_baud_rate(termios,
+                                (speed_t)tdiv64, (speed_t)tdiv64);
+
+        num -= 1;
+        denom -= 1;
+
+        ufcr = readl(sport->port.membase + UFCR);
+        ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div);
+        writel(ufcr, sport->port.membase + UFCR);
+
+        writel(num, sport->port.membase + UBIR);
+        writel(denom, sport->port.membase + UBMR);
+
+        if (!cpu_is_mx1())
+                writel(sport->port.uartclk / div / 1000,
+                                sport->port.membase + MX2_ONEMS);
+
+        writel(old_ucr1, sport->port.membase + UCR1);
+
+        /* set the parity, stop bits and data size */
+        writel(ucr2 | old_txrxen, sport->port.membase + UCR2);
+
+        if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
+                imx_enable_ms(&sport->port);
+
+        spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static const char *imx_type(struct uart_port *port)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+
+        return sport->port.type == PORT_IMX ? "IMX" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void imx_release_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        struct resource *mmres;
+
+        mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(mmres->start, mmres->end - mmres->start + 1);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int imx_request_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        struct resource *mmres;
+        void *ret;
+
+        mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mmres)
+                return -ENODEV;
+
+        ret = request_mem_region(mmres->start, mmres->end - mmres->start + 1,
+                        "imx-uart");
+
+        return  ret ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void imx_config_port(struct uart_port *port, int flags)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+
+        if (flags & UART_CONFIG_TYPE &&
+            imx_request_port(&sport->port) == 0)
+                sport->port.type = PORT_IMX;
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ * The only change we allow are to the flags and type, and
+ * even then only between PORT_IMX and PORT_UNKNOWN
+ */
+static int
+imx_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
+                ret = -EINVAL;
+        if (sport->port.irq != ser->irq)
+                ret = -EINVAL;
+        if (ser->io_type != UPIO_MEM)
+                ret = -EINVAL;
+        if (sport->port.uartclk / 16 != ser->baud_base)
+                ret = -EINVAL;
+        if ((void *)sport->port.mapbase != ser->iomem_base)
+                ret = -EINVAL;
+        if (sport->port.iobase != ser->port)
+                ret = -EINVAL;
+        if (ser->hub6 != 0)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops imx_pops = {
+        .tx_empty       = imx_tx_empty,
+        .set_mctrl      = imx_set_mctrl,
+        .get_mctrl      = imx_get_mctrl,
+        .stop_tx        = imx_stop_tx,
+        .start_tx       = imx_start_tx,
+        .stop_rx        = imx_stop_rx,
+        .enable_ms      = imx_enable_ms,
+        .break_ctl      = imx_break_ctl,
+        .startup        = imx_startup,
+        .shutdown       = imx_shutdown,
+        .set_termios    = imx_set_termios,
+        .type           = imx_type,
+        .release_port   = imx_release_port,
+        .request_port   = imx_request_port,
+        .config_port    = imx_config_port,
+        .verify_port    = imx_verify_port,
+};
+
+static struct imx_port *imx_ports[UART_NR];
+
+#ifdef CONFIG_SERIAL_IMX_CONSOLE
+static void imx_console_putchar(struct uart_port *port, int ch)
+{
+        struct imx_port *sport = (struct imx_port *)port;
+
+        while (readl(sport->port.membase + UTS) & UTS_TXFULL)
+                barrier();
+
+        writel(ch, sport->port.membase + URTX0);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+imx_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct imx_port *sport = imx_ports[co->index];
+        unsigned int old_ucr1, old_ucr2, ucr1;
+
+        /*
+         *      First, save UCR1/2 and then disable interrupts
+         */
+        ucr1 = old_ucr1 = readl(sport->port.membase + UCR1);
+        old_ucr2 = readl(sport->port.membase + UCR2);
+
+        if (cpu_is_mx1())
+                ucr1 |= MX1_UCR1_UARTCLKEN;
+        ucr1 |= UCR1_UARTEN;
+        ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
+
+        writel(ucr1, sport->port.membase + UCR1);
+
+        writel(old_ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
+
+        uart_console_write(&sport->port, s, count, imx_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore UCR1/2
+         */
+        while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
+
+        writel(old_ucr1, sport->port.membase + UCR1);
+        writel(old_ucr2, sport->port.membase + UCR2);
+}
+
+/*
+ * If the port was already initialised (eg, by a boot loader),
+ * try to determine the current setup.
+ */
+static void __init
+imx_console_get_options(struct imx_port *sport, int *baud,
+                           int *parity, int *bits)
+{
+
+        if (readl(sport->port.membase + UCR1) & UCR1_UARTEN) {
+                /* ok, the port was enabled */
+                unsigned int ucr2, ubir,ubmr, uartclk;
+                unsigned int baud_raw;
+                unsigned int ucfr_rfdiv;
+
+                ucr2 = readl(sport->port.membase + UCR2);
+
+                *parity = 'n';
+                if (ucr2 & UCR2_PREN) {
+                        if (ucr2 & UCR2_PROE)
+                                *parity = 'o';
+                        else
+                                *parity = 'e';
+                }
+
+                if (ucr2 & UCR2_WS)
+                        *bits = 8;
+                else
+                        *bits = 7;
+
+                ubir = readl(sport->port.membase + UBIR) & 0xffff;
+                ubmr = readl(sport->port.membase + UBMR) & 0xffff;
+
+                ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7;
+                if (ucfr_rfdiv == 6)
+                        ucfr_rfdiv = 7;
+                else
+                        ucfr_rfdiv = 6 - ucfr_rfdiv;
+
+                uartclk = clk_get_rate(sport->clk);
+                uartclk /= ucfr_rfdiv;
+
+                {       /*
+                         * The next code provides exact computation of
+                         *   baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
+                         * without need of float support or long long division,
+                         * which would be required to prevent 32bit arithmetic overflow
+                         */
+                        unsigned int mul = ubir + 1;
+                        unsigned int div = 16 * (ubmr + 1);
+                        unsigned int rem = uartclk % div;
+
+                        baud_raw = (uartclk / div) * mul;
+                        baud_raw += (rem * mul + div / 2) / div;
+                        *baud = (baud_raw + 50) / 100 * 100;
+                }
+
+                if(*baud != baud_raw)
+                        printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
+                                baud_raw, *baud);
+        }
+}
+
+static int __init
+imx_console_setup(struct console *co, char *options)
+{
+        struct imx_port *sport;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports))
+                co->index = 0;
+        sport = imx_ports[co->index];
+        if(sport == NULL)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                imx_console_get_options(sport, &baud, &parity, &bits);
+
+        imx_setup_ufcr(sport, 0);
+
+        return uart_set_options(&sport->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver imx_reg;
+static struct console imx_console = {
+        .name           = DEV_NAME,
+        .write          = imx_console_write,
+        .device         = uart_console_device,
+        .setup          = imx_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &imx_reg,
+};
+
+#define IMX_CONSOLE     &imx_console
+#else
+#define IMX_CONSOLE     NULL
+#endif
+
+static struct uart_driver imx_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = DRIVER_NAME,
+        .dev_name       = DEV_NAME,
+        .major          = SERIAL_IMX_MAJOR,
+        .minor          = MINOR_START,
+        .nr             = ARRAY_SIZE(imx_ports),
+        .cons           = IMX_CONSOLE,
+};
+
+static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
+{
+        struct imx_port *sport = platform_get_drvdata(dev);
+
+        if (sport)
+                uart_suspend_port(&imx_reg, &sport->port);
+
+        return 0;
+}
+
+static int serial_imx_resume(struct platform_device *dev)
+{
+        struct imx_port *sport = platform_get_drvdata(dev);
+
+        if (sport)
+                uart_resume_port(&imx_reg, &sport->port);
+
+        return 0;
+}
+
+static int serial_imx_probe(struct platform_device *pdev)
+{
+        struct imx_port *sport;
+        struct imxuart_platform_data *pdata;
+        void __iomem *base;
+        int ret = 0;
+        struct resource *res;
+
+        sport = kzalloc(sizeof(*sport), GFP_KERNEL);
+        if (!sport)
+                return -ENOMEM;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                ret = -ENODEV;
+                goto free;
+        }
+
+        base = ioremap(res->start, PAGE_SIZE);
+        if (!base) {
+                ret = -ENOMEM;
+                goto free;
+        }
+
+        sport->port.dev = &pdev->dev;
+        sport->port.mapbase = res->start;
+        sport->port.membase = base;
+        sport->port.type = PORT_IMX,
+        sport->port.iotype = UPIO_MEM;
+        sport->port.irq = platform_get_irq(pdev, 0);
+        sport->rxirq = platform_get_irq(pdev, 0);
+        sport->txirq = platform_get_irq(pdev, 1);
+        sport->rtsirq = platform_get_irq(pdev, 2);
+        sport->port.fifosize = 32;
+        sport->port.ops = &imx_pops;
+        sport->port.flags = UPF_BOOT_AUTOCONF;
+        sport->port.line = pdev->id;
+        init_timer(&sport->timer);
+        sport->timer.function = imx_timeout;
+        sport->timer.data     = (unsigned long)sport;
+
+        sport->clk = clk_get(&pdev->dev, "uart");
+        if (IS_ERR(sport->clk)) {
+                ret = PTR_ERR(sport->clk);
+                goto unmap;
+        }
+        clk_enable(sport->clk);
+
+        sport->port.uartclk = clk_get_rate(sport->clk);
+
+        imx_ports[pdev->id] = sport;
+
+        pdata = pdev->dev.platform_data;
+        if (pdata && (pdata->flags & IMXUART_HAVE_RTSCTS))
+                sport->have_rtscts = 1;
+
+#ifdef CONFIG_IRDA
+        if (pdata && (pdata->flags & IMXUART_IRDA))
+                sport->use_irda = 1;
+#endif
+
+        if (pdata && pdata->init) {
+                ret = pdata->init(pdev);
+                if (ret)
+                        goto clkput;
+        }
+
+        ret = uart_add_one_port(&imx_reg, &sport->port);
+        if (ret)
+                goto deinit;
+        platform_set_drvdata(pdev, &sport->port);
+
+        return 0;
+deinit:
+        if (pdata && pdata->exit)
+                pdata->exit(pdev);
+clkput:
+        clk_put(sport->clk);
+        clk_disable(sport->clk);
+unmap:
+        iounmap(sport->port.membase);
+free:
+        kfree(sport);
+
+        return ret;
+}
+
+static int serial_imx_remove(struct platform_device *pdev)
+{
+        struct imxuart_platform_data *pdata;
+        struct imx_port *sport = platform_get_drvdata(pdev);
+
+        pdata = pdev->dev.platform_data;
+
+        platform_set_drvdata(pdev, NULL);
+
+        if (sport) {
+                uart_remove_one_port(&imx_reg, &sport->port);
+                clk_put(sport->clk);
+        }
+
+        clk_disable(sport->clk);
+
+        if (pdata && pdata->exit)
+                pdata->exit(pdev);
+
+        iounmap(sport->port.membase);
+        kfree(sport);
+
+        return 0;
+}
+
+static struct platform_driver serial_imx_driver = {
+        .probe          = serial_imx_probe,
+        .remove         = serial_imx_remove,
+
+        .suspend        = serial_imx_suspend,
+        .resume         = serial_imx_resume,
+        .driver         = {
+                .name   = "imx-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init imx_serial_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: IMX driver\n");
+
+        ret = uart_register_driver(&imx_reg);
+        if (ret)
+                return ret;
+
+        ret = platform_driver_register(&serial_imx_driver);
+        if (ret != 0)
+                uart_unregister_driver(&imx_reg);
+
+        return 0;
+}
+
+static void __exit imx_serial_exit(void)
+{
+        platform_driver_unregister(&serial_imx_driver);
+        uart_unregister_driver(&imx_reg);
+}
+
+module_init(imx_serial_init);
+module_exit(imx_serial_exit);
+
+MODULE_AUTHOR("Sascha Hauer");
+MODULE_DESCRIPTION("IMX generic serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imx-uart");
diff --git a/drivers/tty/serial/ioc3_serial.c b/drivers/tty/serial/ioc3_serial.c
new file mode 100644
index 000000000000..ee43efc7bdcc
--- /dev/null
+++ b/drivers/tty/serial/ioc3_serial.c
@@ -0,0 +1,2199 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+/*
+ * This file contains a module version of the ioc3 serial driver. This
+ * includes all the support functions needed (support functions, etc.)
+ * and the serial driver itself.
+ */
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/circ_buf.h>
+#include <linux/serial_reg.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/serial_core.h>
+#include <linux/ioc3.h>
+#include <linux/slab.h>
+
+/*
+ * Interesting things about the ioc3
+ */
+
+#define LOGICAL_PORTS           2       /* rs232(0) and rs422(1) */
+#define PORTS_PER_CARD          2
+#define LOGICAL_PORTS_PER_CARD (PORTS_PER_CARD * LOGICAL_PORTS)
+#define MAX_CARDS               8
+#define MAX_LOGICAL_PORTS       (LOGICAL_PORTS_PER_CARD * MAX_CARDS)
+
+/* determine given the sio_ir what port it applies to */
+#define GET_PORT_FROM_SIO_IR(_x)        (_x & SIO_IR_SA) ? 0 : 1
+
+
+/*
+ * we have 2 logical ports (rs232, rs422) for each physical port
+ * evens are rs232, odds are rs422
+ */
+#define GET_PHYSICAL_PORT(_x)   ((_x) >> 1)
+#define GET_LOGICAL_PORT(_x)    ((_x) & 1)
+#define IS_PHYSICAL_PORT(_x)    !((_x) & 1)
+#define IS_RS232(_x)            !((_x) & 1)
+
+static unsigned int Num_of_ioc3_cards;
+static unsigned int Submodule_slot;
+
+/* defining this will get you LOTS of great debug info */
+//#define DEBUG_INTERRUPTS
+#define DPRINT_CONFIG(_x...)    ;
+//#define DPRINT_CONFIG(_x...)  printk _x
+#define NOT_PROGRESS()  ;
+//#define NOT_PROGRESS()        printk("%s : fails %d\n", __func__, __LINE__)
+
+/* number of characters we want to transmit to the lower level at a time */
+#define MAX_CHARS               256
+#define FIFO_SIZE               (MAX_CHARS-1)   /* it's a uchar */
+
+/* Device name we're using */
+#define DEVICE_NAME             "ttySIOC"
+#define DEVICE_MAJOR            204
+#define DEVICE_MINOR            116
+
+/* flags for next_char_state */
+#define NCS_BREAK               0x1
+#define NCS_PARITY              0x2
+#define NCS_FRAMING             0x4
+#define NCS_OVERRUN             0x8
+
+/* cause we need SOME parameters ... */
+#define MIN_BAUD_SUPPORTED      1200
+#define MAX_BAUD_SUPPORTED      115200
+
+/* protocol types supported */
+#define PROTO_RS232             0
+#define PROTO_RS422             1
+
+/* Notification types */
+#define N_DATA_READY            0x01
+#define N_OUTPUT_LOWAT          0x02
+#define N_BREAK                 0x04
+#define N_PARITY_ERROR          0x08
+#define N_FRAMING_ERROR         0x10
+#define N_OVERRUN_ERROR         0x20
+#define N_DDCD                  0x40
+#define N_DCTS                  0x80
+
+#define N_ALL_INPUT             (N_DATA_READY | N_BREAK                    \
+                                        | N_PARITY_ERROR | N_FRAMING_ERROR \
+                                        | N_OVERRUN_ERROR | N_DDCD | N_DCTS)
+
+#define N_ALL_OUTPUT            N_OUTPUT_LOWAT
+
+#define N_ALL_ERRORS            (N_PARITY_ERROR | N_FRAMING_ERROR \
+                                                | N_OVERRUN_ERROR)
+
+#define N_ALL                   (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK    \
+                                        | N_PARITY_ERROR | N_FRAMING_ERROR  \
+                                        | N_OVERRUN_ERROR | N_DDCD | N_DCTS)
+
+#define SER_CLK_SPEED(prediv)   ((22000000 << 1) / prediv)
+#define SER_DIVISOR(x, clk)     (((clk) + (x) * 8) / ((x) * 16))
+#define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div))
+
+/* Some masks */
+#define LCR_MASK_BITS_CHAR      (UART_LCR_WLEN5 | UART_LCR_WLEN6 \
+                                        | UART_LCR_WLEN7 | UART_LCR_WLEN8)
+#define LCR_MASK_STOP_BITS      (UART_LCR_STOP)
+
+#define PENDING(_a, _p)         (readl(&(_p)->vma->sio_ir) & (_a)->ic_enable)
+
+#define RING_BUF_SIZE           4096
+#define BUF_SIZE_BIT            SBBR_L_SIZE
+#define PROD_CONS_MASK          PROD_CONS_PTR_4K
+
+#define TOTAL_RING_BUF_SIZE     (RING_BUF_SIZE * 4)
+
+/* driver specific - one per card */
+struct ioc3_card {
+        struct {
+                /* uart ports are allocated here */
+                struct uart_port icp_uart_port[LOGICAL_PORTS];
+                /* the ioc3_port used for this port */
+                struct ioc3_port *icp_port;
+        } ic_port[PORTS_PER_CARD];
+        /* currently enabled interrupts */
+        uint32_t ic_enable;
+};
+
+/* Local port info for each IOC3 serial port */
+struct ioc3_port {
+        /* handy reference material */
+        struct uart_port *ip_port;
+        struct ioc3_card *ip_card;
+        struct ioc3_driver_data *ip_idd;
+        struct ioc3_submodule *ip_is;
+
+        /* pci mem addresses for this port */
+        struct ioc3_serialregs __iomem *ip_serial_regs;
+        struct ioc3_uartregs __iomem *ip_uart_regs;
+
+        /* Ring buffer page for this port */
+        dma_addr_t ip_dma_ringbuf;
+        /* vaddr of ring buffer */
+        struct ring_buffer *ip_cpu_ringbuf;
+
+        /* Rings for this port */
+        struct ring *ip_inring;
+        struct ring *ip_outring;
+
+        /* Hook to port specific values */
+        struct port_hooks *ip_hooks;
+
+        spinlock_t ip_lock;
+
+        /* Various rx/tx parameters */
+        int ip_baud;
+        int ip_tx_lowat;
+        int ip_rx_timeout;
+
+        /* Copy of notification bits */
+        int ip_notify;
+
+        /* Shadow copies of various registers so we don't need to PIO
+         * read them constantly
+         */
+        uint32_t ip_sscr;
+        uint32_t ip_tx_prod;
+        uint32_t ip_rx_cons;
+        unsigned char ip_flags;
+};
+
+/* tx low water mark.  We need to notify the driver whenever tx is getting
+ * close to empty so it can refill the tx buffer and keep things going.
+ * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll
+ * have no trouble getting in more chars in time (I certainly hope so).
+ */
+#define TX_LOWAT_LATENCY      1000
+#define TX_LOWAT_HZ          (1000000 / TX_LOWAT_LATENCY)
+#define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ)
+
+/* Flags per port */
+#define INPUT_HIGH              0x01
+        /* used to signify that we have turned off the rx_high
+         * temporarily - we need to drain the fifo and don't
+         * want to get blasted with interrupts.
+         */
+#define DCD_ON                  0x02
+        /* DCD state is on */
+#define LOWAT_WRITTEN           0x04
+#define READ_ABORTED            0x08
+        /* the read was aborted - used to avaoid infinate looping
+         * in the interrupt handler
+         */
+#define INPUT_ENABLE            0x10
+
+/* Since each port has different register offsets and bitmasks
+ * for everything, we'll store those that we need in tables so we
+ * don't have to be constantly checking the port we are dealing with.
+ */
+struct port_hooks {
+        uint32_t intr_delta_dcd;
+        uint32_t intr_delta_cts;
+        uint32_t intr_tx_mt;
+        uint32_t intr_rx_timer;
+        uint32_t intr_rx_high;
+        uint32_t intr_tx_explicit;
+        uint32_t intr_clear;
+        uint32_t intr_all;
+        char rs422_select_pin;
+};
+
+static struct port_hooks hooks_array[PORTS_PER_CARD] = {
+        /* values for port A */
+        {
+        .intr_delta_dcd = SIO_IR_SA_DELTA_DCD,
+        .intr_delta_cts = SIO_IR_SA_DELTA_CTS,
+        .intr_tx_mt = SIO_IR_SA_TX_MT,
+        .intr_rx_timer = SIO_IR_SA_RX_TIMER,
+        .intr_rx_high = SIO_IR_SA_RX_HIGH,
+        .intr_tx_explicit = SIO_IR_SA_TX_EXPLICIT,
+        .intr_clear = (SIO_IR_SA_TX_MT | SIO_IR_SA_RX_FULL
+                                | SIO_IR_SA_RX_HIGH
+                                | SIO_IR_SA_RX_TIMER
+                                | SIO_IR_SA_DELTA_DCD
+                                | SIO_IR_SA_DELTA_CTS
+                                | SIO_IR_SA_INT
+                                | SIO_IR_SA_TX_EXPLICIT
+                                | SIO_IR_SA_MEMERR),
+        .intr_all =  SIO_IR_SA,
+        .rs422_select_pin = GPPR_UARTA_MODESEL_PIN,
+         },
+
+        /* values for port B */
+        {
+        .intr_delta_dcd = SIO_IR_SB_DELTA_DCD,
+        .intr_delta_cts = SIO_IR_SB_DELTA_CTS,
+        .intr_tx_mt = SIO_IR_SB_TX_MT,
+        .intr_rx_timer = SIO_IR_SB_RX_TIMER,
+        .intr_rx_high = SIO_IR_SB_RX_HIGH,
+        .intr_tx_explicit = SIO_IR_SB_TX_EXPLICIT,
+        .intr_clear = (SIO_IR_SB_TX_MT | SIO_IR_SB_RX_FULL
+                                | SIO_IR_SB_RX_HIGH
+                                | SIO_IR_SB_RX_TIMER
+                                | SIO_IR_SB_DELTA_DCD
+                                | SIO_IR_SB_DELTA_CTS
+                                | SIO_IR_SB_INT
+                                | SIO_IR_SB_TX_EXPLICIT
+                                | SIO_IR_SB_MEMERR),
+        .intr_all = SIO_IR_SB,
+        .rs422_select_pin = GPPR_UARTB_MODESEL_PIN,
+         }
+};
+
+struct ring_entry {
+        union {
+                struct {
+                        uint32_t alldata;
+                        uint32_t allsc;
+                } all;
+                struct {
+                        char data[4];   /* data bytes */
+                        char sc[4];     /* status/control */
+                } s;
+        } u;
+};
+
+/* Test the valid bits in any of the 4 sc chars using "allsc" member */
+#define RING_ANY_VALID \
+        ((uint32_t)(RXSB_MODEM_VALID | RXSB_DATA_VALID) * 0x01010101)
+
+#define ring_sc         u.s.sc
+#define ring_data       u.s.data
+#define ring_allsc      u.all.allsc
+
+/* Number of entries per ring buffer. */
+#define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry))
+
+/* An individual ring */
+struct ring {
+        struct ring_entry entries[ENTRIES_PER_RING];
+};
+
+/* The whole enchilada */
+struct ring_buffer {
+        struct ring TX_A;
+        struct ring RX_A;
+        struct ring TX_B;
+        struct ring RX_B;
+};
+
+/* Get a ring from a port struct */
+#define RING(_p, _wh)   &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh)
+
+/* for Infinite loop detection  */
+#define MAXITER         10000000
+
+
+/**
+ * set_baud - Baud rate setting code
+ * @port: port to set
+ * @baud: baud rate to use
+ */
+static int set_baud(struct ioc3_port *port, int baud)
+{
+        int divisor;
+        int actual_baud;
+        int diff;
+        int lcr, prediv;
+        struct ioc3_uartregs __iomem *uart;
+
+        for (prediv = 6; prediv < 64; prediv++) {
+                divisor = SER_DIVISOR(baud, SER_CLK_SPEED(prediv));
+                if (!divisor)
+                        continue;       /* invalid divisor */
+                actual_baud = DIVISOR_TO_BAUD(divisor, SER_CLK_SPEED(prediv));
+
+                diff = actual_baud - baud;
+                if (diff < 0)
+                        diff = -diff;
+
+                /* if we're within 1% we've found a match */
+                if (diff * 100 <= actual_baud)
+                        break;
+        }
+
+        /* if the above loop completed, we didn't match
+         * the baud rate.  give up.
+         */
+        if (prediv == 64) {
+                NOT_PROGRESS();
+                return 1;
+        }
+
+        uart = port->ip_uart_regs;
+        lcr = readb(&uart->iu_lcr);
+
+        writeb(lcr | UART_LCR_DLAB, &uart->iu_lcr);
+        writeb((unsigned char)divisor, &uart->iu_dll);
+        writeb((unsigned char)(divisor >> 8), &uart->iu_dlm);
+        writeb((unsigned char)prediv, &uart->iu_scr);
+        writeb((unsigned char)lcr, &uart->iu_lcr);
+
+        return 0;
+}
+
+/**
+ * get_ioc3_port - given a uart port, return the control structure
+ * @the_port: uart port to find
+ */
+static struct ioc3_port *get_ioc3_port(struct uart_port *the_port)
+{
+        struct ioc3_driver_data *idd = dev_get_drvdata(the_port->dev);
+        struct ioc3_card *card_ptr = idd->data[Submodule_slot];
+        int ii, jj;
+
+        if (!card_ptr) {
+                NOT_PROGRESS();
+                return NULL;
+        }
+        for (ii = 0; ii < PORTS_PER_CARD; ii++) {
+                for (jj = 0; jj < LOGICAL_PORTS; jj++) {
+                        if (the_port == &card_ptr->ic_port[ii].icp_uart_port[jj])
+                                return card_ptr->ic_port[ii].icp_port;
+                }
+        }
+        NOT_PROGRESS();
+        return NULL;
+}
+
+/**
+ * port_init - Initialize the sio and ioc3 hardware for a given port
+ *                      called per port from attach...
+ * @port: port to initialize
+ */
+static int inline port_init(struct ioc3_port *port)
+{
+        uint32_t sio_cr;
+        struct port_hooks *hooks = port->ip_hooks;
+        struct ioc3_uartregs __iomem *uart;
+        int reset_loop_counter = 0xfffff;
+        struct ioc3_driver_data *idd = port->ip_idd;
+
+        /* Idle the IOC3 serial interface */
+        writel(SSCR_RESET, &port->ip_serial_regs->sscr);
+
+        /* Wait until any pending bus activity for this port has ceased */
+        do {
+                sio_cr = readl(&idd->vma->sio_cr);
+                if (reset_loop_counter-- <= 0) {
+                        printk(KERN_WARNING
+                               "IOC3 unable to come out of reset"
+                                " scr 0x%x\n", sio_cr);
+                        return -1;
+                }
+        } while (!(sio_cr & SIO_CR_ARB_DIAG_IDLE) &&
+               (((sio_cr &= SIO_CR_ARB_DIAG) == SIO_CR_ARB_DIAG_TXA)
+                || sio_cr == SIO_CR_ARB_DIAG_TXB
+                || sio_cr == SIO_CR_ARB_DIAG_RXA
+                || sio_cr == SIO_CR_ARB_DIAG_RXB));
+
+        /* Finish reset sequence */
+        writel(0, &port->ip_serial_regs->sscr);
+
+        /* Once RESET is done, reload cached tx_prod and rx_cons values
+         * and set rings to empty by making prod == cons
+         */
+        port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
+        writel(port->ip_tx_prod, &port->ip_serial_regs->stpir);
+        port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+        writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);
+
+        /* Disable interrupts for this 16550 */
+        uart = port->ip_uart_regs;
+        writeb(0, &uart->iu_lcr);
+        writeb(0, &uart->iu_ier);
+
+        /* Set the default baud */
+        set_baud(port, port->ip_baud);
+
+        /* Set line control to 8 bits no parity */
+        writeb(UART_LCR_WLEN8 | 0, &uart->iu_lcr);
+        /* UART_LCR_STOP == 1 stop */
+
+        /* Enable the FIFOs */
+        writeb(UART_FCR_ENABLE_FIFO, &uart->iu_fcr);
+        /* then reset 16550 FIFOs */
+        writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+               &uart->iu_fcr);
+
+        /* Clear modem control register */
+        writeb(0, &uart->iu_mcr);
+
+        /* Clear deltas in modem status register */
+        writel(0, &port->ip_serial_regs->shadow);
+
+        /* Only do this once per port pair */
+        if (port->ip_hooks == &hooks_array[0]) {
+                unsigned long ring_pci_addr;
+                uint32_t __iomem *sbbr_l, *sbbr_h;
+
+                sbbr_l = &idd->vma->sbbr_l;
+                sbbr_h = &idd->vma->sbbr_h;
+                ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf;
+                DPRINT_CONFIG(("%s: ring_pci_addr 0x%p\n",
+                               __func__, (void *)ring_pci_addr));
+
+                writel((unsigned int)((uint64_t) ring_pci_addr >> 32), sbbr_h);
+                writel((unsigned int)ring_pci_addr | BUF_SIZE_BIT, sbbr_l);
+        }
+
+        /* Set the receive timeout value to 10 msec */
+        writel(SRTR_HZ / 100, &port->ip_serial_regs->srtr);
+
+        /* Set rx threshold, enable DMA */
+        /* Set high water mark at 3/4 of full ring */
+        port->ip_sscr = (ENTRIES_PER_RING * 3 / 4);
+
+        /* uart experiences pauses at high baud rate reducing actual
+         * throughput by 10% or so unless we enable high speed polling
+         * XXX when this hardware bug is resolved we should revert to
+         * normal polling speed
+         */
+        port->ip_sscr |= SSCR_HIGH_SPD;
+
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+        /* Disable and clear all serial related interrupt bits */
+        port->ip_card->ic_enable &= ~hooks->intr_clear;
+        ioc3_disable(port->ip_is, idd, hooks->intr_clear);
+        ioc3_ack(port->ip_is, idd, hooks->intr_clear);
+        return 0;
+}
+
+/**
+ * enable_intrs - enable interrupts
+ * @port: port to enable
+ * @mask: mask to use
+ */
+static void enable_intrs(struct ioc3_port *port, uint32_t mask)
+{
+        if ((port->ip_card->ic_enable & mask) != mask) {
+                port->ip_card->ic_enable |= mask;
+                ioc3_enable(port->ip_is, port->ip_idd, mask);
+        }
+}
+
+/**
+ * local_open - local open a port
+ * @port: port to open
+ */
+static inline int local_open(struct ioc3_port *port)
+{
+        int spiniter = 0;
+
+        port->ip_flags = INPUT_ENABLE;
+
+        /* Pause the DMA interface if necessary */
+        if (port->ip_sscr & SSCR_DMA_EN) {
+                writel(port->ip_sscr | SSCR_DMA_PAUSE,
+                       &port->ip_serial_regs->sscr);
+                while ((readl(&port->ip_serial_regs->sscr)
+                        & SSCR_PAUSE_STATE) == 0) {
+                        spiniter++;
+                        if (spiniter > MAXITER) {
+                                NOT_PROGRESS();
+                                return -1;
+                        }
+                }
+        }
+
+        /* Reset the input fifo.  If the uart received chars while the port
+         * was closed and DMA is not enabled, the uart may have a bunch of
+         * chars hanging around in its rx fifo which will not be discarded
+         * by rclr in the upper layer. We must get rid of them here.
+         */
+        writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR,
+               &port->ip_uart_regs->iu_fcr);
+
+        writeb(UART_LCR_WLEN8, &port->ip_uart_regs->iu_lcr);
+        /* UART_LCR_STOP == 1 stop */
+
+        /* Re-enable DMA, set default threshold to intr whenever there is
+         * data available.
+         */
+        port->ip_sscr &= ~SSCR_RX_THRESHOLD;
+        port->ip_sscr |= 1;     /* default threshold */
+
+        /* Plug in the new sscr.  This implicitly clears the DMA_PAUSE
+         * flag if it was set above
+         */
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        port->ip_tx_lowat = 1;
+        return 0;
+}
+
+/**
+ * set_rx_timeout - Set rx timeout and threshold values.
+ * @port: port to use
+ * @timeout: timeout value in ticks
+ */
+static inline int set_rx_timeout(struct ioc3_port *port, int timeout)
+{
+        int threshold;
+
+        port->ip_rx_timeout = timeout;
+
+        /* Timeout is in ticks.  Let's figure out how many chars we
+         * can receive at the current baud rate in that interval
+         * and set the rx threshold to that amount.  There are 4 chars
+         * per ring entry, so we'll divide the number of chars that will
+         * arrive in timeout by 4.
+         * So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
+         */
+        threshold = timeout * port->ip_baud / 4000;
+        if (threshold == 0)
+                threshold = 1;  /* otherwise we'll intr all the time! */
+
+        if ((unsigned)threshold > (unsigned)SSCR_RX_THRESHOLD)
+                return 1;
+
+        port->ip_sscr &= ~SSCR_RX_THRESHOLD;
+        port->ip_sscr |= threshold;
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+        /* Now set the rx timeout to the given value
+         * again timeout * SRTR_HZ / HZ
+         */
+        timeout = timeout * SRTR_HZ / 100;
+        if (timeout > SRTR_CNT)
+                timeout = SRTR_CNT;
+        writel(timeout, &port->ip_serial_regs->srtr);
+        return 0;
+}
+
+/**
+ * config_port - config the hardware
+ * @port: port to config
+ * @baud: baud rate for the port
+ * @byte_size: data size
+ * @stop_bits: number of stop bits
+ * @parenb: parity enable ?
+ * @parodd: odd parity ?
+ */
+static inline int
+config_port(struct ioc3_port *port,
+            int baud, int byte_size, int stop_bits, int parenb, int parodd)
+{
+        char lcr, sizebits;
+        int spiniter = 0;
+
+        DPRINT_CONFIG(("%s: line %d baud %d byte_size %d stop %d parenb %d "
+                        "parodd %d\n",
+                       __func__, ((struct uart_port *)port->ip_port)->line,
+                        baud, byte_size, stop_bits, parenb, parodd));
+
+        if (set_baud(port, baud))
+                return 1;
+
+        switch (byte_size) {
+        case 5:
+                sizebits = UART_LCR_WLEN5;
+                break;
+        case 6:
+                sizebits = UART_LCR_WLEN6;
+                break;
+        case 7:
+                sizebits = UART_LCR_WLEN7;
+                break;
+        case 8:
+                sizebits = UART_LCR_WLEN8;
+                break;
+        default:
+                return 1;
+        }
+
+        /* Pause the DMA interface if necessary */
+        if (port->ip_sscr & SSCR_DMA_EN) {
+                writel(port->ip_sscr | SSCR_DMA_PAUSE,
+                       &port->ip_serial_regs->sscr);
+                while ((readl(&port->ip_serial_regs->sscr)
+                        & SSCR_PAUSE_STATE) == 0) {
+                        spiniter++;
+                        if (spiniter > MAXITER)
+                                return -1;
+                }
+        }
+
+        /* Clear relevant fields in lcr */
+        lcr = readb(&port->ip_uart_regs->iu_lcr);
+        lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR |
+                 UART_LCR_PARITY | LCR_MASK_STOP_BITS);
+
+        /* Set byte size in lcr */
+        lcr |= sizebits;
+
+        /* Set parity */
+        if (parenb) {
+                lcr |= UART_LCR_PARITY;
+                if (!parodd)
+                        lcr |= UART_LCR_EPAR;
+        }
+
+        /* Set stop bits */
+        if (stop_bits)
+                lcr |= UART_LCR_STOP /* 2 stop bits */ ;
+
+        writeb(lcr, &port->ip_uart_regs->iu_lcr);
+
+        /* Re-enable the DMA interface if necessary */
+        if (port->ip_sscr & SSCR_DMA_EN) {
+                writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        }
+        port->ip_baud = baud;
+
+        /* When we get within this number of ring entries of filling the
+         * entire ring on tx, place an EXPLICIT intr to generate a lowat
+         * notification when output has drained.
+         */
+        port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4;
+        if (port->ip_tx_lowat == 0)
+                port->ip_tx_lowat = 1;
+
+        set_rx_timeout(port, 2);
+        return 0;
+}
+
+/**
+ * do_write - Write bytes to the port.  Returns the number of bytes
+ *                      actually written. Called from transmit_chars
+ * @port: port to use
+ * @buf: the stuff to write
+ * @len: how many bytes in 'buf'
+ */
+static inline int do_write(struct ioc3_port *port, char *buf, int len)
+{
+        int prod_ptr, cons_ptr, total = 0;
+        struct ring *outring;
+        struct ring_entry *entry;
+        struct port_hooks *hooks = port->ip_hooks;
+
+        BUG_ON(!(len >= 0));
+
+        prod_ptr = port->ip_tx_prod;
+        cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
+        outring = port->ip_outring;
+
+        /* Maintain a 1-entry red-zone.  The ring buffer is full when
+         * (cons - prod) % ring_size is 1.  Rather than do this subtraction
+         * in the body of the loop, I'll do it now.
+         */
+        cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK;
+
+        /* Stuff the bytes into the output */
+        while ((prod_ptr != cons_ptr) && (len > 0)) {
+                int xx;
+
+                /* Get 4 bytes (one ring entry) at a time */
+                entry = (struct ring_entry *)((caddr_t) outring + prod_ptr);
+
+                /* Invalidate all entries */
+                entry->ring_allsc = 0;
+
+                /* Copy in some bytes */
+                for (xx = 0; (xx < 4) && (len > 0); xx++) {
+                        entry->ring_data[xx] = *buf++;
+                        entry->ring_sc[xx] = TXCB_VALID;
+                        len--;
+                        total++;
+                }
+
+                /* If we are within some small threshold of filling up the
+                 * entire ring buffer, we must place an EXPLICIT intr here
+                 * to generate a lowat interrupt in case we subsequently
+                 * really do fill up the ring and the caller goes to sleep.
+                 * No need to place more than one though.
+                 */
+                if (!(port->ip_flags & LOWAT_WRITTEN) &&
+                    ((cons_ptr - prod_ptr) & PROD_CONS_MASK)
+                    <= port->ip_tx_lowat * (int)sizeof(struct ring_entry)) {
+                        port->ip_flags |= LOWAT_WRITTEN;
+                        entry->ring_sc[0] |= TXCB_INT_WHEN_DONE;
+                }
+
+                /* Go on to next entry */
+                prod_ptr += sizeof(struct ring_entry);
+                prod_ptr &= PROD_CONS_MASK;
+        }
+
+        /* If we sent something, start DMA if necessary */
+        if (total > 0 && !(port->ip_sscr & SSCR_DMA_EN)) {
+                port->ip_sscr |= SSCR_DMA_EN;
+                writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        }
+
+        /* Store the new producer pointer.  If tx is disabled, we stuff the
+         * data into the ring buffer, but we don't actually start tx.
+         */
+        if (!uart_tx_stopped(port->ip_port)) {
+                writel(prod_ptr, &port->ip_serial_regs->stpir);
+
+                /* If we are now transmitting, enable tx_mt interrupt so we
+                 * can disable DMA if necessary when the tx finishes.
+                 */
+                if (total > 0)
+                        enable_intrs(port, hooks->intr_tx_mt);
+        }
+        port->ip_tx_prod = prod_ptr;
+
+        return total;
+}
+
+/**
+ * disable_intrs - disable interrupts
+ * @port: port to enable
+ * @mask: mask to use
+ */
+static inline void disable_intrs(struct ioc3_port *port, uint32_t mask)
+{
+        if (port->ip_card->ic_enable & mask) {
+                ioc3_disable(port->ip_is, port->ip_idd, mask);
+                port->ip_card->ic_enable &= ~mask;
+        }
+}
+
+/**
+ * set_notification - Modify event notification
+ * @port: port to use
+ * @mask: events mask
+ * @set_on: set ?
+ */
+static int set_notification(struct ioc3_port *port, int mask, int set_on)
+{
+        struct port_hooks *hooks = port->ip_hooks;
+        uint32_t intrbits, sscrbits;
+
+        BUG_ON(!mask);
+
+        intrbits = sscrbits = 0;
+
+        if (mask & N_DATA_READY)
+                intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high);
+        if (mask & N_OUTPUT_LOWAT)
+                intrbits |= hooks->intr_tx_explicit;
+        if (mask & N_DDCD) {
+                intrbits |= hooks->intr_delta_dcd;
+                sscrbits |= SSCR_RX_RING_DCD;
+        }
+        if (mask & N_DCTS)
+                intrbits |= hooks->intr_delta_cts;
+
+        if (set_on) {
+                enable_intrs(port, intrbits);
+                port->ip_notify |= mask;
+                port->ip_sscr |= sscrbits;
+        } else {
+                disable_intrs(port, intrbits);
+                port->ip_notify &= ~mask;
+                port->ip_sscr &= ~sscrbits;
+        }
+
+        /* We require DMA if either DATA_READY or DDCD notification is
+         * currently requested. If neither of these is requested and
+         * there is currently no tx in progress, DMA may be disabled.
+         */
+        if (port->ip_notify & (N_DATA_READY | N_DDCD))
+                port->ip_sscr |= SSCR_DMA_EN;
+        else if (!(port->ip_card->ic_enable & hooks->intr_tx_mt))
+                port->ip_sscr &= ~SSCR_DMA_EN;
+
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        return 0;
+}
+
+/**
+ * set_mcr - set the master control reg
+ * @the_port: port to use
+ * @mask1: mcr mask
+ * @mask2: shadow mask
+ */
+static inline int set_mcr(struct uart_port *the_port,
+                          int mask1, int mask2)
+{
+        struct ioc3_port *port = get_ioc3_port(the_port);
+        uint32_t shadow;
+        int spiniter = 0;
+        char mcr;
+
+        if (!port)
+                return -1;
+
+        /* Pause the DMA interface if necessary */
+        if (port->ip_sscr & SSCR_DMA_EN) {
+                writel(port->ip_sscr | SSCR_DMA_PAUSE,
+                       &port->ip_serial_regs->sscr);
+                while ((readl(&port->ip_serial_regs->sscr)
+                        & SSCR_PAUSE_STATE) == 0) {
+                        spiniter++;
+                        if (spiniter > MAXITER)
+                                return -1;
+                }
+        }
+        shadow = readl(&port->ip_serial_regs->shadow);
+        mcr = (shadow & 0xff000000) >> 24;
+
+        /* Set new value */
+        mcr |= mask1;
+        shadow |= mask2;
+        writeb(mcr, &port->ip_uart_regs->iu_mcr);
+        writel(shadow, &port->ip_serial_regs->shadow);
+
+        /* Re-enable the DMA interface if necessary */
+        if (port->ip_sscr & SSCR_DMA_EN) {
+                writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        }
+        return 0;
+}
+
+/**
+ * ioc3_set_proto - set the protocol for the port
+ * @port: port to use
+ * @proto: protocol to use
+ */
+static int ioc3_set_proto(struct ioc3_port *port, int proto)
+{
+        struct port_hooks *hooks = port->ip_hooks;
+
+        switch (proto) {
+        default:
+        case PROTO_RS232:
+                /* Clear the appropriate GIO pin */
+                DPRINT_CONFIG(("%s: rs232\n", __func__));
+                writel(0, (&port->ip_idd->vma->gppr[0]
+                                        + hooks->rs422_select_pin));
+                break;
+
+        case PROTO_RS422:
+                /* Set the appropriate GIO pin */
+                DPRINT_CONFIG(("%s: rs422\n", __func__));
+                writel(1, (&port->ip_idd->vma->gppr[0]
+                                        + hooks->rs422_select_pin));
+                break;
+        }
+        return 0;
+}
+
+/**
+ * transmit_chars - upper level write, called with the_port->lock
+ * @the_port: port to write
+ */
+static void transmit_chars(struct uart_port *the_port)
+{
+        int xmit_count, tail, head;
+        int result;
+        char *start;
+        struct tty_struct *tty;
+        struct ioc3_port *port = get_ioc3_port(the_port);
+        struct uart_state *state;
+
+        if (!the_port)
+                return;
+        if (!port)
+                return;
+
+        state = the_port->state;
+        tty = state->port.tty;
+
+        if (uart_circ_empty(&state->xmit) || uart_tx_stopped(the_port)) {
+                /* Nothing to do or hw stopped */
+                set_notification(port, N_ALL_OUTPUT, 0);
+                return;
+        }
+
+        head = state->xmit.head;
+        tail = state->xmit.tail;
+        start = (char *)&state->xmit.buf[tail];
+
+        /* write out all the data or until the end of the buffer */
+        xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail);
+        if (xmit_count > 0) {
+                result = do_write(port, start, xmit_count);
+                if (result > 0) {
+                        /* booking */
+                        xmit_count -= result;
+                        the_port->icount.tx += result;
+                        /* advance the pointers */
+                        tail += result;
+                        tail &= UART_XMIT_SIZE - 1;
+                        state->xmit.tail = tail;
+                        start = (char *)&state->xmit.buf[tail];
+                }
+        }
+        if (uart_circ_chars_pending(&state->xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(the_port);
+
+        if (uart_circ_empty(&state->xmit)) {
+                set_notification(port, N_OUTPUT_LOWAT, 0);
+        } else {
+                set_notification(port, N_OUTPUT_LOWAT, 1);
+        }
+}
+
+/**
+ * ioc3_change_speed - change the speed of the port
+ * @the_port: port to change
+ * @new_termios: new termios settings
+ * @old_termios: old termios settings
+ */
+static void
+ioc3_change_speed(struct uart_port *the_port,
+                  struct ktermios *new_termios, struct ktermios *old_termios)
+{
+        struct ioc3_port *port = get_ioc3_port(the_port);
+        unsigned int cflag, iflag;
+        int baud;
+        int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
+        struct uart_state *state = the_port->state;
+
+        cflag = new_termios->c_cflag;
+        iflag = new_termios->c_iflag;
+
+        switch (cflag & CSIZE) {
+        case CS5:
+                new_data = 5;
+                break;
+        case CS6:
+                new_data = 6;
+                break;
+        case CS7:
+                new_data = 7;
+                break;
+        case CS8:
+                new_data = 8;
+                break;
+        default:
+                /* cuz we always need a default ... */
+                new_data = 5;
+                break;
+        }
+        if (cflag & CSTOPB) {
+                new_stop = 1;
+        }
+        if (cflag & PARENB) {
+                new_parity_enable = 1;
+                if (cflag & PARODD)
+                        new_parity = 1;
+        }
+        baud = uart_get_baud_rate(the_port, new_termios, old_termios,
+                                  MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED);
+        DPRINT_CONFIG(("%s: returned baud %d for line %d\n", __func__, baud,
+                                the_port->line));
+
+        if (!the_port->fifosize)
+                the_port->fifosize = FIFO_SIZE;
+        uart_update_timeout(the_port, cflag, baud);
+
+        the_port->ignore_status_mask = N_ALL_INPUT;
+
+        state->port.tty->low_latency = 1;
+
+        if (iflag & IGNPAR)
+                the_port->ignore_status_mask &= ~(N_PARITY_ERROR
+                                                  | N_FRAMING_ERROR);
+        if (iflag & IGNBRK) {
+                the_port->ignore_status_mask &= ~N_BREAK;
+                if (iflag & IGNPAR)
+                        the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
+        }
+        if (!(cflag & CREAD)) {
+                /* ignore everything */
+                the_port->ignore_status_mask &= ~N_DATA_READY;
+        }
+
+        if (cflag & CRTSCTS) {
+                /* enable hardware flow control */
+                port->ip_sscr |= SSCR_HFC_EN;
+        }
+        else {
+                /* disable hardware flow control */
+                port->ip_sscr &= ~SSCR_HFC_EN;
+        }
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+        /* Set the configuration and proper notification call */
+        DPRINT_CONFIG(("%s : port 0x%p line %d cflag 0%o "
+                       "config_port(baud %d data %d stop %d penable %d "
+                        " parity %d), notification 0x%x\n",
+                       __func__, (void *)port, the_port->line, cflag, baud,
+                       new_data, new_stop, new_parity_enable, new_parity,
+                       the_port->ignore_status_mask));
+
+        if ((config_port(port, baud,    /* baud */
+                         new_data,      /* byte size */
+                         new_stop,      /* stop bits */
+                         new_parity_enable,     /* set parity */
+                         new_parity)) >= 0) {   /* parity 1==odd */
+                set_notification(port, the_port->ignore_status_mask, 1);
+        }
+}
+
+/**
+ * ic3_startup_local - Start up the serial port - returns >= 0 if no errors
+ * @the_port: Port to operate on
+ */
+static inline int ic3_startup_local(struct uart_port *the_port)
+{
+        struct ioc3_port *port;
+
+        if (!the_port) {
+                NOT_PROGRESS();
+                return -1;
+        }
+
+        port = get_ioc3_port(the_port);
+        if (!port) {
+                NOT_PROGRESS();
+                return -1;
+        }
+
+        local_open(port);
+
+        /* set the protocol */
+        ioc3_set_proto(port, IS_RS232(the_port->line) ? PROTO_RS232 :
+                                                        PROTO_RS422);
+        return 0;
+}
+
+/*
+ * ioc3_cb_output_lowat - called when the output low water mark is hit
+ * @port: port to output
+ */
+static void ioc3_cb_output_lowat(struct ioc3_port *port)
+{
+        unsigned long pflags;
+
+        /* the_port->lock is set on the call here */
+        if (port->ip_port) {
+                spin_lock_irqsave(&port->ip_port->lock, pflags);
+                transmit_chars(port->ip_port);
+                spin_unlock_irqrestore(&port->ip_port->lock, pflags);
+        }
+}
+
+/*
+ * ioc3_cb_post_ncs - called for some basic errors
+ * @port: port to use
+ * @ncs: event
+ */
+static void ioc3_cb_post_ncs(struct uart_port *the_port, int ncs)
+{
+        struct uart_icount *icount;
+
+        icount = &the_port->icount;
+
+        if (ncs & NCS_BREAK)
+                icount->brk++;
+        if (ncs & NCS_FRAMING)
+                icount->frame++;
+        if (ncs & NCS_OVERRUN)
+                icount->overrun++;
+        if (ncs & NCS_PARITY)
+                icount->parity++;
+}
+
+/**
+ * do_read - Read in bytes from the port.  Return the number of bytes
+ *                      actually read.
+ * @the_port: port to use
+ * @buf: place to put the stuff we read
+ * @len: how big 'buf' is
+ */
+
+static inline int do_read(struct uart_port *the_port, char *buf, int len)
+{
+        int prod_ptr, cons_ptr, total;
+        struct ioc3_port *port = get_ioc3_port(the_port);
+        struct ring *inring;
+        struct ring_entry *entry;
+        struct port_hooks *hooks = port->ip_hooks;
+        int byte_num;
+        char *sc;
+        int loop_counter;
+
+        BUG_ON(!(len >= 0));
+        BUG_ON(!port);
+
+        /* There is a nasty timing issue in the IOC3. When the rx_timer
+         * expires or the rx_high condition arises, we take an interrupt.
+         * At some point while servicing the interrupt, we read bytes from
+         * the ring buffer and re-arm the rx_timer.  However the rx_timer is
+         * not started until the first byte is received *after* it is armed,
+         * and any bytes pending in the rx construction buffers are not drained
+         * to memory until either there are 4 bytes available or the rx_timer
+         * expires.  This leads to a potential situation where data is left
+         * in the construction buffers forever - 1 to 3 bytes were received
+         * after the interrupt was generated but before the rx_timer was
+         * re-armed. At that point as long as no subsequent bytes are received
+         * the timer will never be started and the bytes will remain in the
+         * construction buffer forever.  The solution is to execute a DRAIN
+         * command after rearming the timer.  This way any bytes received before
+         * the DRAIN will be drained to memory, and any bytes received after
+         * the DRAIN will start the TIMER and be drained when it expires.
+         * Luckily, this only needs to be done when the DMA buffer is empty
+         * since there is no requirement that this function return all
+         * available data as long as it returns some.
+         */
+        /* Re-arm the timer */
+
+        writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);
+
+        prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+        cons_ptr = port->ip_rx_cons;
+
+        if (prod_ptr == cons_ptr) {
+                int reset_dma = 0;
+
+                /* Input buffer appears empty, do a flush. */
+
+                /* DMA must be enabled for this to work. */
+                if (!(port->ip_sscr & SSCR_DMA_EN)) {
+                        port->ip_sscr |= SSCR_DMA_EN;
+                        reset_dma = 1;
+                }
+
+                /* Potential race condition: we must reload the srpir after
+                 * issuing the drain command, otherwise we could think the rx
+                 * buffer is empty, then take a very long interrupt, and when
+                 * we come back it's full and we wait forever for the drain to
+                 * complete.
+                 */
+                writel(port->ip_sscr | SSCR_RX_DRAIN,
+                       &port->ip_serial_regs->sscr);
+                prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+
+                /* We must not wait for the DRAIN to complete unless there are
+                 * at least 8 bytes (2 ring entries) available to receive the
+                 * data otherwise the DRAIN will never complete and we'll
+                 * deadlock here.
+                 * In fact, to make things easier, I'll just ignore the flush if
+                 * there is any data at all now available.
+                 */
+                if (prod_ptr == cons_ptr) {
+                        loop_counter = 0;
+                        while (readl(&port->ip_serial_regs->sscr) &
+                               SSCR_RX_DRAIN) {
+                                loop_counter++;
+                                if (loop_counter > MAXITER)
+                                        return -1;
+                        }
+
+                        /* SIGH. We have to reload the prod_ptr *again* since
+                         * the drain may have caused it to change
+                         */
+                        prod_ptr = readl(&port->ip_serial_regs->srpir)
+                            & PROD_CONS_MASK;
+                }
+                if (reset_dma) {
+                        port->ip_sscr &= ~SSCR_DMA_EN;
+                        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+                }
+        }
+        inring = port->ip_inring;
+        port->ip_flags &= ~READ_ABORTED;
+
+        total = 0;
+        loop_counter = 0xfffff; /* to avoid hangs */
+
+        /* Grab bytes from the hardware */
+        while ((prod_ptr != cons_ptr) && (len > 0)) {
+                entry = (struct ring_entry *)((caddr_t) inring + cons_ptr);
+
+                if (loop_counter-- <= 0) {
+                        printk(KERN_WARNING "IOC3 serial: "
+                               "possible hang condition/"
+                               "port stuck on read (line %d).\n",
+                                the_port->line);
+                        break;
+                }
+
+                /* According to the producer pointer, this ring entry
+                 * must contain some data.  But if the PIO happened faster
+                 * than the DMA, the data may not be available yet, so let's
+                 * wait until it arrives.
+                 */
+                if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
+                        /* Indicate the read is aborted so we don't disable
+                         * the interrupt thinking that the consumer is
+                         * congested.
+                         */
+                        port->ip_flags |= READ_ABORTED;
+                        len = 0;
+                        break;
+                }
+
+                /* Load the bytes/status out of the ring entry */
+                for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) {
+                        sc = &(entry->ring_sc[byte_num]);
+
+                        /* Check for change in modem state or overrun */
+                        if ((*sc & RXSB_MODEM_VALID)
+                            && (port->ip_notify & N_DDCD)) {
+                                /* Notify upper layer if DCD dropped */
+                                if ((port->ip_flags & DCD_ON)
+                                    && !(*sc & RXSB_DCD)) {
+                                        /* If we have already copied some data,
+                                         * return it.  We'll pick up the carrier
+                                         * drop on the next pass.  That way we
+                                         * don't throw away the data that has
+                                         * already been copied back to
+                                         * the caller's buffer.
+                                         */
+                                        if (total > 0) {
+                                                len = 0;
+                                                break;
+                                        }
+                                        port->ip_flags &= ~DCD_ON;
+
+                                        /* Turn off this notification so the
+                                         * carrier drop protocol won't see it
+                                         * again when it does a read.
+                                         */
+                                        *sc &= ~RXSB_MODEM_VALID;
+
+                                        /* To keep things consistent, we need
+                                         * to update the consumer pointer so
+                                         * the next reader won't come in and
+                                         * try to read the same ring entries
+                                         * again. This must be done here before
+                                         * the dcd change.
+                                         */
+
+                                        if ((entry->ring_allsc & RING_ANY_VALID)
+                                            == 0) {
+                                                cons_ptr += (int)sizeof
+                                                    (struct ring_entry);
+                                                cons_ptr &= PROD_CONS_MASK;
+                                        }
+                                        writel(cons_ptr,
+                                               &port->ip_serial_regs->srcir);
+                                        port->ip_rx_cons = cons_ptr;
+
+                                        /* Notify upper layer of carrier drop */
+                                        if ((port->ip_notify & N_DDCD)
+                                            && port->ip_port) {
+                                                uart_handle_dcd_change
+                                                        (port->ip_port, 0);
+                                                wake_up_interruptible
+                                                    (&the_port->state->
+                                                     port.delta_msr_wait);
+                                        }
+
+                                        /* If we had any data to return, we
+                                         * would have returned it above.
+                                         */
+                                        return 0;
+                                }
+                        }
+                        if (*sc & RXSB_MODEM_VALID) {
+                                /* Notify that an input overrun occurred */
+                                if ((*sc & RXSB_OVERRUN)
+                                    && (port->ip_notify & N_OVERRUN_ERROR)) {
+                                        ioc3_cb_post_ncs(the_port, NCS_OVERRUN);
+                                }
+                                /* Don't look at this byte again */
+                                *sc &= ~RXSB_MODEM_VALID;
+                        }
+
+                        /* Check for valid data or RX errors */
+                        if ((*sc & RXSB_DATA_VALID) &&
+                            ((*sc & (RXSB_PAR_ERR
+                                     | RXSB_FRAME_ERR | RXSB_BREAK))
+                             && (port->ip_notify & (N_PARITY_ERROR
+                                                    | N_FRAMING_ERROR
+                                                    | N_BREAK)))) {
+                                /* There is an error condition on the next byte.
+                                 * If we have already transferred some bytes,
+                                 * we'll stop here. Otherwise if this is the
+                                 * first byte to be read, we'll just transfer
+                                 * it alone after notifying the
+                                 * upper layer of its status.
+                                 */
+                                if (total > 0) {
+                                        len = 0;
+                                        break;
+                                } else {
+                                        if ((*sc & RXSB_PAR_ERR) &&
+                                            (port->
+                                             ip_notify & N_PARITY_ERROR)) {
+                                                ioc3_cb_post_ncs(the_port,
+                                                                 NCS_PARITY);
+                                        }
+                                        if ((*sc & RXSB_FRAME_ERR) &&
+                                            (port->
+                                             ip_notify & N_FRAMING_ERROR)) {
+                                                ioc3_cb_post_ncs(the_port,
+                                                                 NCS_FRAMING);
+                                        }
+                                        if ((*sc & RXSB_BREAK)
+                                            && (port->ip_notify & N_BREAK)) {
+                                                ioc3_cb_post_ncs
+                                                    (the_port, NCS_BREAK);
+                                        }
+                                        len = 1;
+                                }
+                        }
+                        if (*sc & RXSB_DATA_VALID) {
+                                *sc &= ~RXSB_DATA_VALID;
+                                *buf = entry->ring_data[byte_num];
+                                buf++;
+                                len--;
+                                total++;
+                        }
+                }
+
+                /* If we used up this entry entirely, go on to the next one,
+                 * otherwise we must have run out of buffer space, so
+                 * leave the consumer pointer here for the next read in case
+                 * there are still unread bytes in this entry.
+                 */
+                if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
+                        cons_ptr += (int)sizeof(struct ring_entry);
+                        cons_ptr &= PROD_CONS_MASK;
+                }
+        }
+
+        /* Update consumer pointer and re-arm rx timer interrupt */
+        writel(cons_ptr, &port->ip_serial_regs->srcir);
+        port->ip_rx_cons = cons_ptr;
+
+        /* If we have now dipped below the rx high water mark and we have
+         * rx_high interrupt turned off, we can now turn it back on again.
+         */
+        if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr)
+                                               & PROD_CONS_MASK) <
+                                              ((port->
+                                                ip_sscr &
+                                                SSCR_RX_THRESHOLD)
+                                               << PROD_CONS_PTR_OFF))) {
+                port->ip_flags &= ~INPUT_HIGH;
+                enable_intrs(port, hooks->intr_rx_high);
+        }
+        return total;
+}
+
+/**
+ * receive_chars - upper level read.
+ * @the_port: port to read from
+ */
+static int receive_chars(struct uart_port *the_port)
+{
+        struct tty_struct *tty;
+        unsigned char ch[MAX_CHARS];
+        int read_count = 0, read_room, flip = 0;
+        struct uart_state *state = the_port->state;
+        struct ioc3_port *port = get_ioc3_port(the_port);
+        unsigned long pflags;
+
+        /* Make sure all the pointers are "good" ones */
+        if (!state)
+                return 0;
+        if (!state->port.tty)
+                return 0;
+
+        if (!(port->ip_flags & INPUT_ENABLE))
+                return 0;
+
+        spin_lock_irqsave(&the_port->lock, pflags);
+        tty = state->port.tty;
+
+        read_count = do_read(the_port, ch, MAX_CHARS);
+        if (read_count > 0) {
+                flip = 1;
+                read_room = tty_insert_flip_string(tty, ch, read_count);
+                the_port->icount.rx += read_count;
+        }
+        spin_unlock_irqrestore(&the_port->lock, pflags);
+
+        if (flip)
+                tty_flip_buffer_push(tty);
+
+        return read_count;
+}
+
+/**
+ * ioc3uart_intr_one - lowest level (per port) interrupt handler.
+ * @is : submodule
+ * @idd: driver data
+ * @pending: interrupts to handle
+ */
+
+static int inline
+ioc3uart_intr_one(struct ioc3_submodule *is,
+                        struct ioc3_driver_data *idd,
+                        unsigned int pending)
+{
+        int port_num = GET_PORT_FROM_SIO_IR(pending);
+        struct port_hooks *hooks;
+        unsigned int rx_high_rd_aborted = 0;
+        unsigned long flags;
+        struct uart_port *the_port;
+        struct ioc3_port *port;
+        int loop_counter;
+        struct ioc3_card *card_ptr;
+        unsigned int sio_ir;
+
+        card_ptr = idd->data[is->id];
+        port = card_ptr->ic_port[port_num].icp_port;
+        hooks = port->ip_hooks;
+
+        /* Possible race condition here: The tx_mt interrupt bit may be
+         * cleared without the intervention of the interrupt handler,
+         * e.g. by a write.  If the top level interrupt handler reads a
+         * tx_mt, then some other processor does a write, starting up
+         * output, then we come in here, see the tx_mt and stop DMA, the
+         * output started by the other processor will hang.  Thus we can
+         * only rely on tx_mt being legitimate if it is read while the
+         * port lock is held.  Therefore this bit must be ignored in the
+         * passed in interrupt mask which was read by the top level
+         * interrupt handler since the port lock was not held at the time
+         * it was read.  We can only rely on this bit being accurate if it
+         * is read while the port lock is held.  So we'll clear it for now,
+         * and reload it later once we have the port lock.
+         */
+
+        sio_ir = pending & ~(hooks->intr_tx_mt);
+        spin_lock_irqsave(&port->ip_lock, flags);
+
+        loop_counter = MAXITER; /* to avoid hangs */
+
+        do {
+                uint32_t shadow;
+
+                if (loop_counter-- <= 0) {
+                        printk(KERN_WARNING "IOC3 serial: "
+                               "possible hang condition/"
+                               "port stuck on interrupt (line %d).\n",
+                                ((struct uart_port *)port->ip_port)->line);
+                        break;
+                }
+                /* Handle a DCD change */
+                if (sio_ir & hooks->intr_delta_dcd) {
+                        ioc3_ack(is, idd, hooks->intr_delta_dcd);
+                        shadow = readl(&port->ip_serial_regs->shadow);
+
+                        if ((port->ip_notify & N_DDCD)
+                            && (shadow & SHADOW_DCD)
+                            && (port->ip_port)) {
+                                the_port = port->ip_port;
+                                uart_handle_dcd_change(the_port,
+                                                shadow & SHADOW_DCD);
+                                wake_up_interruptible
+                                    (&the_port->state->port.delta_msr_wait);
+                        } else if ((port->ip_notify & N_DDCD)
+                                   && !(shadow & SHADOW_DCD)) {
+                                /* Flag delta DCD/no DCD */
+                                uart_handle_dcd_change(port->ip_port,
+                                                shadow & SHADOW_DCD);
+                                port->ip_flags |= DCD_ON;
+                        }
+                }
+
+                /* Handle a CTS change */
+                if (sio_ir & hooks->intr_delta_cts) {
+                        ioc3_ack(is, idd, hooks->intr_delta_cts);
+                        shadow = readl(&port->ip_serial_regs->shadow);
+
+                        if ((port->ip_notify & N_DCTS) && (port->ip_port)) {
+                                the_port = port->ip_port;
+                                uart_handle_cts_change(the_port, shadow
+                                                & SHADOW_CTS);
+                                wake_up_interruptible
+                                    (&the_port->state->port.delta_msr_wait);
+                        }
+                }
+
+                /* rx timeout interrupt.  Must be some data available.  Put this
+                 * before the check for rx_high since servicing this condition
+                 * may cause that condition to clear.
+                 */
+                if (sio_ir & hooks->intr_rx_timer) {
+                        ioc3_ack(is, idd, hooks->intr_rx_timer);
+                        if ((port->ip_notify & N_DATA_READY)
+                                                && (port->ip_port)) {
+                                receive_chars(port->ip_port);
+                        }
+                }
+
+                /* rx high interrupt. Must be after rx_timer.  */
+                else if (sio_ir & hooks->intr_rx_high) {
+                        /* Data available, notify upper layer */
+                        if ((port->ip_notify & N_DATA_READY) && port->ip_port) {
+                                receive_chars(port->ip_port);
+                        }
+
+                        /* We can't ACK this interrupt.  If receive_chars didn't
+                         * cause the condition to clear, we'll have to disable
+                         * the interrupt until the data is drained.
+                         * If the read was aborted, don't disable the interrupt
+                         * as this may cause us to hang indefinitely.  An
+                         * aborted read generally means that this interrupt
+                         * hasn't been delivered to the cpu yet anyway, even
+                         * though we see it as asserted when we read the sio_ir.
+                         */
+                        if ((sio_ir = PENDING(card_ptr, idd))
+                                        & hooks->intr_rx_high) {
+                                if (port->ip_flags & READ_ABORTED) {
+                                        rx_high_rd_aborted++;
+                                }
+                                else {
+                                        card_ptr->ic_enable &= ~hooks->intr_rx_high;
+                                        port->ip_flags |= INPUT_HIGH;
+                                }
+                        }
+                }
+
+                /* We got a low water interrupt: notify upper layer to
+                 * send more data.  Must come before tx_mt since servicing
+                 * this condition may cause that condition to clear.
+                 */
+                if (sio_ir & hooks->intr_tx_explicit) {
+                        port->ip_flags &= ~LOWAT_WRITTEN;
+                        ioc3_ack(is, idd, hooks->intr_tx_explicit);
+                        if (port->ip_notify & N_OUTPUT_LOWAT)
+                                ioc3_cb_output_lowat(port);
+                }
+
+                /* Handle tx_mt.  Must come after tx_explicit.  */
+                else if (sio_ir & hooks->intr_tx_mt) {
+                        /* If we are expecting a lowat notification
+                         * and we get to this point it probably means that for
+                         * some reason the tx_explicit didn't work as expected
+                         * (that can legitimately happen if the output buffer is
+                         * filled up in just the right way).
+                         * So send the notification now.
+                         */
+                        if (port->ip_notify & N_OUTPUT_LOWAT) {
+                                ioc3_cb_output_lowat(port);
+
+                                /* We need to reload the sio_ir since the lowat
+                                 * call may have caused another write to occur,
+                                 * clearing the tx_mt condition.
+                                 */
+                                sio_ir = PENDING(card_ptr, idd);
+                        }
+
+                        /* If the tx_mt condition still persists even after the
+                         * lowat call, we've got some work to do.
+                         */
+                        if (sio_ir & hooks->intr_tx_mt) {
+                                /* If we are not currently expecting DMA input,
+                                 * and the transmitter has just gone idle,
+                                 * there is no longer any reason for DMA, so
+                                 * disable it.
+                                 */
+                                if (!(port->ip_notify
+                                      & (N_DATA_READY | N_DDCD))) {
+                                        BUG_ON(!(port->ip_sscr
+                                                 & SSCR_DMA_EN));
+                                        port->ip_sscr &= ~SSCR_DMA_EN;
+                                        writel(port->ip_sscr,
+                                               &port->ip_serial_regs->sscr);
+                                }
+                                /* Prevent infinite tx_mt interrupt */
+                                card_ptr->ic_enable &= ~hooks->intr_tx_mt;
+                        }
+                }
+                sio_ir = PENDING(card_ptr, idd);
+
+                /* if the read was aborted and only hooks->intr_rx_high,
+                 * clear hooks->intr_rx_high, so we do not loop forever.
+                 */
+
+                if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) {
+                        sio_ir &= ~hooks->intr_rx_high;
+                }
+        } while (sio_ir & hooks->intr_all);
+
+        spin_unlock_irqrestore(&port->ip_lock, flags);
+        ioc3_enable(is, idd, card_ptr->ic_enable);
+        return 0;
+}
+
+/**
+ * ioc3uart_intr - field all serial interrupts
+ * @is : submodule
+ * @idd: driver data
+ * @pending: interrupts to handle
+ *
+ */
+
+static int ioc3uart_intr(struct ioc3_submodule *is,
+                        struct ioc3_driver_data *idd,
+                        unsigned int pending)
+{
+        int ret = 0;
+
+        /*
+         * The upper level interrupt handler sends interrupts for both ports
+         * here. So we need to call for each port with its interrupts.
+         */
+
+        if (pending & SIO_IR_SA)
+                ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SA);
+        if (pending & SIO_IR_SB)
+                ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SB);
+
+        return ret;
+}
+
+/**
+ * ic3_type
+ * @port: Port to operate with (we ignore since we only have one port)
+ *
+ */
+static const char *ic3_type(struct uart_port *the_port)
+{
+        if (IS_RS232(the_port->line))
+                return "SGI IOC3 Serial [rs232]";
+        else
+                return "SGI IOC3 Serial [rs422]";
+}
+
+/**
+ * ic3_tx_empty - Is the transmitter empty?
+ * @port: Port to operate on
+ *
+ */
+static unsigned int ic3_tx_empty(struct uart_port *the_port)
+{
+        unsigned int ret = 0;
+        struct ioc3_port *port = get_ioc3_port(the_port);
+
+        if (readl(&port->ip_serial_regs->shadow) & SHADOW_TEMT)
+                ret = TIOCSER_TEMT;
+        return ret;
+}
+
+/**
+ * ic3_stop_tx - stop the transmitter
+ * @port: Port to operate on
+ *
+ */
+static void ic3_stop_tx(struct uart_port *the_port)
+{
+        struct ioc3_port *port = get_ioc3_port(the_port);
+
+        if (port)
+                set_notification(port, N_OUTPUT_LOWAT, 0);
+}
+
+/**
+ * ic3_stop_rx - stop the receiver
+ * @port: Port to operate on
+ *
+ */
+static void ic3_stop_rx(struct uart_port *the_port)
+{
+        struct ioc3_port *port = get_ioc3_port(the_port);
+
+        if (port)
+                port->ip_flags &= ~INPUT_ENABLE;
+}
+
+/**
+ * null_void_function
+ * @port: Port to operate on
+ *
+ */
+static void null_void_function(struct uart_port *the_port)
+{
+}
+
+/**
+ * ic3_shutdown - shut down the port - free irq and disable
+ * @port: port to shut down
+ *
+ */
+static void ic3_shutdown(struct uart_port *the_port)
+{
+        unsigned long port_flags;
+        struct ioc3_port *port;
+        struct uart_state *state;
+
+        port = get_ioc3_port(the_port);
+        if (!port)
+                return;
+
+        state = the_port->state;
+        wake_up_interruptible(&state->port.delta_msr_wait);
+
+        spin_lock_irqsave(&the_port->lock, port_flags);
+        set_notification(port, N_ALL, 0);
+        spin_unlock_irqrestore(&the_port->lock, port_flags);
+}
+
+/**
+ * ic3_set_mctrl - set control lines (dtr, rts, etc)
+ * @port: Port to operate on
+ * @mctrl: Lines to set/unset
+ *
+ */
+static void ic3_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
+{
+        unsigned char mcr = 0;
+
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        set_mcr(the_port, mcr, SHADOW_DTR);
+}
+
+/**
+ * ic3_get_mctrl - get control line info
+ * @port: port to operate on
+ *
+ */
+static unsigned int ic3_get_mctrl(struct uart_port *the_port)
+{
+        struct ioc3_port *port = get_ioc3_port(the_port);
+        uint32_t shadow;
+        unsigned int ret = 0;
+
+        if (!port)
+                return 0;
+
+        shadow = readl(&port->ip_serial_regs->shadow);
+        if (shadow & SHADOW_DCD)
+                ret |= TIOCM_CD;
+        if (shadow & SHADOW_DR)
+                ret |= TIOCM_DSR;
+        if (shadow & SHADOW_CTS)
+                ret |= TIOCM_CTS;
+        return ret;
+}
+
+/**
+ * ic3_start_tx - Start transmitter. Called with the_port->lock
+ * @port: Port to operate on
+ *
+ */
+static void ic3_start_tx(struct uart_port *the_port)
+{
+        struct ioc3_port *port = get_ioc3_port(the_port);
+
+        if (port) {
+                set_notification(port, N_OUTPUT_LOWAT, 1);
+                enable_intrs(port, port->ip_hooks->intr_tx_mt);
+        }
+}
+
+/**
+ * ic3_break_ctl - handle breaks
+ * @port: Port to operate on
+ * @break_state: Break state
+ *
+ */
+static void ic3_break_ctl(struct uart_port *the_port, int break_state)
+{
+}
+
+/**
+ * ic3_startup - Start up the serial port - always return 0 (We're always on)
+ * @port: Port to operate on
+ *
+ */
+static int ic3_startup(struct uart_port *the_port)
+{
+        int retval;
+        struct ioc3_port *port;
+        struct ioc3_card *card_ptr;
+        unsigned long port_flags;
+
+        if (!the_port) {
+                NOT_PROGRESS();
+                return -ENODEV;
+        }
+        port = get_ioc3_port(the_port);
+        if (!port) {
+                NOT_PROGRESS();
+                return -ENODEV;
+        }
+        card_ptr = port->ip_card;
+        port->ip_port = the_port;
+
+        if (!card_ptr) {
+                NOT_PROGRESS();
+                return -ENODEV;
+        }
+
+        /* Start up the serial port */
+        spin_lock_irqsave(&the_port->lock, port_flags);
+        retval = ic3_startup_local(the_port);
+        spin_unlock_irqrestore(&the_port->lock, port_flags);
+        return retval;
+}
+
+/**
+ * ic3_set_termios - set termios stuff
+ * @port: port to operate on
+ * @termios: New settings
+ * @termios: Old
+ *
+ */
+static void
+ic3_set_termios(struct uart_port *the_port,
+                struct ktermios *termios, struct ktermios *old_termios)
+{
+        unsigned long port_flags;
+
+        spin_lock_irqsave(&the_port->lock, port_flags);
+        ioc3_change_speed(the_port, termios, old_termios);
+        spin_unlock_irqrestore(&the_port->lock, port_flags);
+}
+
+/**
+ * ic3_request_port - allocate resources for port - no op....
+ * @port: port to operate on
+ *
+ */
+static int ic3_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/* Associate the uart functions above - given to serial core */
+static struct uart_ops ioc3_ops = {
+        .tx_empty = ic3_tx_empty,
+        .set_mctrl = ic3_set_mctrl,
+        .get_mctrl = ic3_get_mctrl,
+        .stop_tx = ic3_stop_tx,
+        .start_tx = ic3_start_tx,
+        .stop_rx = ic3_stop_rx,
+        .enable_ms = null_void_function,
+        .break_ctl = ic3_break_ctl,
+        .startup = ic3_startup,
+        .shutdown = ic3_shutdown,
+        .set_termios = ic3_set_termios,
+        .type = ic3_type,
+        .release_port = null_void_function,
+        .request_port = ic3_request_port,
+};
+
+/*
+ * Boot-time initialization code
+ */
+
+static struct uart_driver ioc3_uart = {
+        .owner = THIS_MODULE,
+        .driver_name = "ioc3_serial",
+        .dev_name = DEVICE_NAME,
+        .major = DEVICE_MAJOR,
+        .minor = DEVICE_MINOR,
+        .nr = MAX_LOGICAL_PORTS
+};
+
+/**
+ * ioc3_serial_core_attach - register with serial core
+ *              This is done during pci probing
+ * @is: submodule struct for this
+ * @idd: handle for this card
+ */
+static inline int ioc3_serial_core_attach( struct ioc3_submodule *is,
+                                struct ioc3_driver_data *idd)
+{
+        struct ioc3_port *port;
+        struct uart_port *the_port;
+        struct ioc3_card *card_ptr = idd->data[is->id];
+        int ii, phys_port;
+        struct pci_dev *pdev = idd->pdev;
+
+        DPRINT_CONFIG(("%s: attach pdev 0x%p - card_ptr 0x%p\n",
+                       __func__, pdev, (void *)card_ptr));
+
+        if (!card_ptr)
+                return -ENODEV;
+
+        /* once around for each logical port on this card */
+        for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
+                phys_port = GET_PHYSICAL_PORT(ii);
+                the_port = &card_ptr->ic_port[phys_port].
+                                icp_uart_port[GET_LOGICAL_PORT(ii)];
+                port = card_ptr->ic_port[phys_port].icp_port;
+                port->ip_port = the_port;
+
+                DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p [%d/%d]\n",
+                        __func__, (void *)the_port, (void *)port,
+                                phys_port, ii));
+
+                /* membase, iobase and mapbase just need to be non-0 */
+                the_port->membase = (unsigned char __iomem *)1;
+                the_port->iobase = (pdev->bus->number << 16) |  ii;
+                the_port->line = (Num_of_ioc3_cards << 2) | ii;
+                the_port->mapbase = 1;
+                the_port->type = PORT_16550A;
+                the_port->fifosize = FIFO_SIZE;
+                the_port->ops = &ioc3_ops;
+                the_port->irq = idd->irq_io;
+                the_port->dev = &pdev->dev;
+
+                if (uart_add_one_port(&ioc3_uart, the_port) < 0) {
+                        printk(KERN_WARNING
+                          "%s: unable to add port %d bus %d\n",
+                               __func__, the_port->line, pdev->bus->number);
+                } else {
+                        DPRINT_CONFIG(("IOC3 serial port %d irq %d bus %d\n",
+                          the_port->line, the_port->irq, pdev->bus->number));
+                }
+
+                /* all ports are rs232 for now */
+                if (IS_PHYSICAL_PORT(ii))
+                        ioc3_set_proto(port, PROTO_RS232);
+        }
+        return 0;
+}
+
+/**
+ * ioc3uart_remove - register detach function
+ * @is: submodule struct for this submodule
+ * @idd: ioc3 driver data for this submodule
+ */
+
+static int ioc3uart_remove(struct ioc3_submodule *is,
+                        struct ioc3_driver_data *idd)
+{
+        struct ioc3_card *card_ptr = idd->data[is->id];
+        struct uart_port *the_port;
+        struct ioc3_port *port;
+        int ii;
+
+        if (card_ptr) {
+                for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
+                        the_port = &card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
+                                        icp_uart_port[GET_LOGICAL_PORT(ii)];
+                        if (the_port)
+                                uart_remove_one_port(&ioc3_uart, the_port);
+                        port = card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].icp_port;
+                        if (port && IS_PHYSICAL_PORT(ii)
+                                        && (GET_PHYSICAL_PORT(ii) == 0)) {
+                                pci_free_consistent(port->ip_idd->pdev,
+                                        TOTAL_RING_BUF_SIZE,
+                                        (void *)port->ip_cpu_ringbuf,
+                                        port->ip_dma_ringbuf);
+                                kfree(port);
+                                card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
+                                                        icp_port = NULL;
+                        }
+                }
+                kfree(card_ptr);
+                idd->data[is->id] = NULL;
+        }
+        return 0;
+}
+
+/**
+ * ioc3uart_probe - card probe function called from shim driver
+ * @is: submodule struct for this submodule
+ * @idd: ioc3 driver data for this card
+ */
+
+static int __devinit
+ioc3uart_probe(struct ioc3_submodule *is, struct ioc3_driver_data *idd)
+{
+        struct pci_dev *pdev = idd->pdev;
+        struct ioc3_card *card_ptr;
+        int ret = 0;
+        struct ioc3_port *port;
+        struct ioc3_port *ports[PORTS_PER_CARD];
+        int phys_port;
+        int cnt;
+
+        DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __func__, is, idd));
+
+        card_ptr = kzalloc(sizeof(struct ioc3_card), GFP_KERNEL);
+        if (!card_ptr) {
+                printk(KERN_WARNING "ioc3_attach_one"
+                       ": unable to get memory for the IOC3\n");
+                return -ENOMEM;
+        }
+        idd->data[is->id] = card_ptr;
+        Submodule_slot = is->id;
+
+        writel(((UARTA_BASE >> 3) << SIO_CR_SER_A_BASE_SHIFT) |
+                ((UARTB_BASE >> 3) << SIO_CR_SER_B_BASE_SHIFT) |
+                (0xf << SIO_CR_CMD_PULSE_SHIFT), &idd->vma->sio_cr);
+
+        pci_write_config_dword(pdev, PCI_LAT, 0xff00);
+
+        /* Enable serial port mode select generic PIO pins as outputs */
+        ioc3_gpcr_set(idd, GPCR_UARTA_MODESEL | GPCR_UARTB_MODESEL);
+
+        /* Create port structures for each port */
+        for (phys_port = 0; phys_port < PORTS_PER_CARD; phys_port++) {
+                port = kzalloc(sizeof(struct ioc3_port), GFP_KERNEL);
+                if (!port) {
+                        printk(KERN_WARNING
+                               "IOC3 serial memory not available for port\n");
+                        ret = -ENOMEM;
+                        goto out4;
+                }
+                spin_lock_init(&port->ip_lock);
+
+                /* we need to remember the previous ones, to point back to
+                 * them farther down - setting up the ring buffers.
+                 */
+                ports[phys_port] = port;
+
+                /* init to something useful */
+                card_ptr->ic_port[phys_port].icp_port = port;
+                port->ip_is = is;
+                port->ip_idd = idd;
+                port->ip_baud = 9600;
+                port->ip_card = card_ptr;
+                port->ip_hooks = &hooks_array[phys_port];
+
+                /* Setup each port */
+                if (phys_port == 0) {
+                        port->ip_serial_regs = &idd->vma->port_a;
+                        port->ip_uart_regs = &idd->vma->sregs.uarta;
+
+                        DPRINT_CONFIG(("%s : Port A ip_serial_regs 0x%p "
+                                       "ip_uart_regs 0x%p\n",
+                                       __func__,
+                                       (void *)port->ip_serial_regs,
+                                       (void *)port->ip_uart_regs));
+
+                        /* setup ring buffers */
+                        port->ip_cpu_ringbuf = pci_alloc_consistent(pdev,
+                                TOTAL_RING_BUF_SIZE, &port->ip_dma_ringbuf);
+
+                        BUG_ON(!((((int64_t) port->ip_dma_ringbuf) &
+                                  (TOTAL_RING_BUF_SIZE - 1)) == 0));
+                        port->ip_inring = RING(port, RX_A);
+                        port->ip_outring = RING(port, TX_A);
+                        DPRINT_CONFIG(("%s : Port A ip_cpu_ringbuf 0x%p "
+                                       "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
+                                        "ip_outring 0x%p\n",
+                                       __func__,
+                                       (void *)port->ip_cpu_ringbuf,
+                                       (void *)port->ip_dma_ringbuf,
+                                       (void *)port->ip_inring,
+                                       (void *)port->ip_outring));
+                }
+                else {
+                        port->ip_serial_regs = &idd->vma->port_b;
+                        port->ip_uart_regs = &idd->vma->sregs.uartb;
+
+                        DPRINT_CONFIG(("%s : Port B ip_serial_regs 0x%p "
+                                       "ip_uart_regs 0x%p\n",
+                                       __func__,
+                                       (void *)port->ip_serial_regs,
+                                       (void *)port->ip_uart_regs));
+
+                        /* share the ring buffers */
+                        port->ip_dma_ringbuf =
+                            ports[phys_port - 1]->ip_dma_ringbuf;
+                        port->ip_cpu_ringbuf =
+                            ports[phys_port - 1]->ip_cpu_ringbuf;
+                        port->ip_inring = RING(port, RX_B);
+                        port->ip_outring = RING(port, TX_B);
+                        DPRINT_CONFIG(("%s : Port B ip_cpu_ringbuf 0x%p "
+                                       "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
+                                        "ip_outring 0x%p\n",
+                                       __func__,
+                                       (void *)port->ip_cpu_ringbuf,
+                                       (void *)port->ip_dma_ringbuf,
+                                       (void *)port->ip_inring,
+                                       (void *)port->ip_outring));
+                }
+
+                DPRINT_CONFIG(("%s : port %d [addr 0x%p] card_ptr 0x%p",
+                               __func__,
+                               phys_port, (void *)port, (void *)card_ptr));
+                DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n",
+                               (void *)port->ip_serial_regs,
+                               (void *)port->ip_uart_regs));
+
+                /* Initialize the hardware for IOC3 */
+                port_init(port);
+
+                DPRINT_CONFIG(("%s: phys_port %d port 0x%p inring 0x%p "
+                               "outring 0x%p\n",
+                               __func__,
+                               phys_port, (void *)port,
+                               (void *)port->ip_inring,
+                               (void *)port->ip_outring));
+
+        }
+
+        /* register port with the serial core */
+
+        if ((ret = ioc3_serial_core_attach(is, idd)))
+                goto out4;
+
+        Num_of_ioc3_cards++;
+
+        return ret;
+
+        /* error exits that give back resources */
+out4:
+        for (cnt = 0; cnt < phys_port; cnt++)
+                kfree(ports[cnt]);
+
+        kfree(card_ptr);
+        return ret;
+}
+
+static struct ioc3_submodule ioc3uart_ops = {
+        .name = "IOC3uart",
+        .probe = ioc3uart_probe,
+        .remove = ioc3uart_remove,
+        /* call .intr for both ports initially */
+        .irq_mask = SIO_IR_SA | SIO_IR_SB,
+        .intr = ioc3uart_intr,
+        .owner = THIS_MODULE,
+};
+
+/**
+ * ioc3_detect - module init called,
+ */
+static int __init ioc3uart_init(void)
+{
+        int ret;
+
+        /* register with serial core */
+        if ((ret = uart_register_driver(&ioc3_uart)) < 0) {
+                printk(KERN_WARNING
+                       "%s: Couldn't register IOC3 uart serial driver\n",
+                       __func__);
+                return ret;
+        }
+        ret = ioc3_register_submodule(&ioc3uart_ops);
+        if (ret)
+                uart_unregister_driver(&ioc3_uart);
+        return ret;
+}
+
+static void __exit ioc3uart_exit(void)
+{
+        ioc3_unregister_submodule(&ioc3uart_ops);
+        uart_unregister_driver(&ioc3_uart);
+}
+
+module_init(ioc3uart_init);
+module_exit(ioc3uart_exit);
+
+MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");
+MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC3 card");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/ioc4_serial.c b/drivers/tty/serial/ioc4_serial.c
new file mode 100644
index 000000000000..fcfe82653ac8
--- /dev/null
+++ b/drivers/tty/serial/ioc4_serial.c
@@ -0,0 +1,2953 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003-2006 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+
+/*
+ * This file contains a module version of the ioc4 serial driver. This
+ * includes all the support functions needed (support functions, etc.)
+ * and the serial driver itself.
+ */
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/circ_buf.h>
+#include <linux/serial_reg.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ioc4.h>
+#include <linux/serial_core.h>
+#include <linux/slab.h>
+
+/*
+ * interesting things about the ioc4
+ */
+
+#define IOC4_NUM_SERIAL_PORTS   4       /* max ports per card */
+#define IOC4_NUM_CARDS          8       /* max cards per partition */
+
+#define GET_SIO_IR(_n)  (_n == 0) ? (IOC4_SIO_IR_S0) : \
+                                (_n == 1) ? (IOC4_SIO_IR_S1) : \
+                                (_n == 2) ? (IOC4_SIO_IR_S2) : \
+                                (IOC4_SIO_IR_S3)
+
+#define GET_OTHER_IR(_n)  (_n == 0) ? (IOC4_OTHER_IR_S0_MEMERR) : \
+                                (_n == 1) ? (IOC4_OTHER_IR_S1_MEMERR) : \
+                                (_n == 2) ? (IOC4_OTHER_IR_S2_MEMERR) : \
+                                (IOC4_OTHER_IR_S3_MEMERR)
+
+
+/*
+ * All IOC4 registers are 32 bits wide.
+ */
+
+/*
+ * PCI Memory Space Map
+ */
+#define IOC4_PCI_ERR_ADDR_L     0x000   /* Low Error Address */
+#define IOC4_PCI_ERR_ADDR_VLD           (0x1 << 0)
+#define IOC4_PCI_ERR_ADDR_MST_ID_MSK    (0xf << 1)
+#define IOC4_PCI_ERR_ADDR_MST_NUM_MSK   (0xe << 1)
+#define IOC4_PCI_ERR_ADDR_MST_TYP_MSK   (0x1 << 1)
+#define IOC4_PCI_ERR_ADDR_MUL_ERR       (0x1 << 5)
+#define IOC4_PCI_ERR_ADDR_ADDR_MSK      (0x3ffffff << 6)
+
+/* Interrupt types */
+#define IOC4_SIO_INTR_TYPE      0
+#define IOC4_OTHER_INTR_TYPE    1
+#define IOC4_NUM_INTR_TYPES     2
+
+/* Bitmasks for IOC4_SIO_IR, IOC4_SIO_IEC, and IOC4_SIO_IES  */
+#define IOC4_SIO_IR_S0_TX_MT       0x00000001   /* Serial port 0 TX empty */
+#define IOC4_SIO_IR_S0_RX_FULL     0x00000002   /* Port 0 RX buf full */
+#define IOC4_SIO_IR_S0_RX_HIGH     0x00000004   /* Port 0 RX hiwat */
+#define IOC4_SIO_IR_S0_RX_TIMER    0x00000008   /* Port 0 RX timeout */
+#define IOC4_SIO_IR_S0_DELTA_DCD   0x00000010   /* Port 0 delta DCD */
+#define IOC4_SIO_IR_S0_DELTA_CTS   0x00000020   /* Port 0 delta CTS */
+#define IOC4_SIO_IR_S0_INT         0x00000040   /* Port 0 pass-thru intr */
+#define IOC4_SIO_IR_S0_TX_EXPLICIT 0x00000080   /* Port 0 explicit TX thru */
+#define IOC4_SIO_IR_S1_TX_MT       0x00000100   /* Serial port 1 */
+#define IOC4_SIO_IR_S1_RX_FULL     0x00000200   /* */
+#define IOC4_SIO_IR_S1_RX_HIGH     0x00000400   /* */
+#define IOC4_SIO_IR_S1_RX_TIMER    0x00000800   /* */
+#define IOC4_SIO_IR_S1_DELTA_DCD   0x00001000   /* */
+#define IOC4_SIO_IR_S1_DELTA_CTS   0x00002000   /* */
+#define IOC4_SIO_IR_S1_INT         0x00004000   /* */
+#define IOC4_SIO_IR_S1_TX_EXPLICIT 0x00008000   /* */
+#define IOC4_SIO_IR_S2_TX_MT       0x00010000   /* Serial port 2 */
+#define IOC4_SIO_IR_S2_RX_FULL     0x00020000   /* */
+#define IOC4_SIO_IR_S2_RX_HIGH     0x00040000   /* */
+#define IOC4_SIO_IR_S2_RX_TIMER    0x00080000   /* */
+#define IOC4_SIO_IR_S2_DELTA_DCD   0x00100000   /* */
+#define IOC4_SIO_IR_S2_DELTA_CTS   0x00200000   /* */
+#define IOC4_SIO_IR_S2_INT         0x00400000   /* */
+#define IOC4_SIO_IR_S2_TX_EXPLICIT 0x00800000   /* */
+#define IOC4_SIO_IR_S3_TX_MT       0x01000000   /* Serial port 3 */
+#define IOC4_SIO_IR_S3_RX_FULL     0x02000000   /* */
+#define IOC4_SIO_IR_S3_RX_HIGH     0x04000000   /* */
+#define IOC4_SIO_IR_S3_RX_TIMER    0x08000000   /* */
+#define IOC4_SIO_IR_S3_DELTA_DCD   0x10000000   /* */
+#define IOC4_SIO_IR_S3_DELTA_CTS   0x20000000   /* */
+#define IOC4_SIO_IR_S3_INT         0x40000000   /* */
+#define IOC4_SIO_IR_S3_TX_EXPLICIT 0x80000000   /* */
+
+/* Per device interrupt masks */
+#define IOC4_SIO_IR_S0          (IOC4_SIO_IR_S0_TX_MT | \
+                                 IOC4_SIO_IR_S0_RX_FULL | \
+                                 IOC4_SIO_IR_S0_RX_HIGH | \
+                                 IOC4_SIO_IR_S0_RX_TIMER | \
+                                 IOC4_SIO_IR_S0_DELTA_DCD | \
+                                 IOC4_SIO_IR_S0_DELTA_CTS | \
+                                 IOC4_SIO_IR_S0_INT | \
+                                 IOC4_SIO_IR_S0_TX_EXPLICIT)
+#define IOC4_SIO_IR_S1          (IOC4_SIO_IR_S1_TX_MT | \
+                                 IOC4_SIO_IR_S1_RX_FULL | \
+                                 IOC4_SIO_IR_S1_RX_HIGH | \
+                                 IOC4_SIO_IR_S1_RX_TIMER | \
+                                 IOC4_SIO_IR_S1_DELTA_DCD | \
+                                 IOC4_SIO_IR_S1_DELTA_CTS | \
+                                 IOC4_SIO_IR_S1_INT | \
+                                 IOC4_SIO_IR_S1_TX_EXPLICIT)
+#define IOC4_SIO_IR_S2          (IOC4_SIO_IR_S2_TX_MT | \
+                                 IOC4_SIO_IR_S2_RX_FULL | \
+                                 IOC4_SIO_IR_S2_RX_HIGH | \
+                                 IOC4_SIO_IR_S2_RX_TIMER | \
+                                 IOC4_SIO_IR_S2_DELTA_DCD | \
+                                 IOC4_SIO_IR_S2_DELTA_CTS | \
+                                 IOC4_SIO_IR_S2_INT | \
+                                 IOC4_SIO_IR_S2_TX_EXPLICIT)
+#define IOC4_SIO_IR_S3          (IOC4_SIO_IR_S3_TX_MT | \
+                                 IOC4_SIO_IR_S3_RX_FULL | \
+                                 IOC4_SIO_IR_S3_RX_HIGH | \
+                                 IOC4_SIO_IR_S3_RX_TIMER | \
+                                 IOC4_SIO_IR_S3_DELTA_DCD | \
+                                 IOC4_SIO_IR_S3_DELTA_CTS | \
+                                 IOC4_SIO_IR_S3_INT | \
+                                 IOC4_SIO_IR_S3_TX_EXPLICIT)
+
+/* Bitmasks for IOC4_OTHER_IR, IOC4_OTHER_IEC, and IOC4_OTHER_IES  */
+#define IOC4_OTHER_IR_ATA_INT           0x00000001  /* ATAPI intr pass-thru */
+#define IOC4_OTHER_IR_ATA_MEMERR        0x00000002  /* ATAPI DMA PCI error */
+#define IOC4_OTHER_IR_S0_MEMERR         0x00000004  /* Port 0 PCI error */
+#define IOC4_OTHER_IR_S1_MEMERR         0x00000008  /* Port 1 PCI error */
+#define IOC4_OTHER_IR_S2_MEMERR         0x00000010  /* Port 2 PCI error */
+#define IOC4_OTHER_IR_S3_MEMERR         0x00000020  /* Port 3 PCI error */
+#define IOC4_OTHER_IR_KBD_INT           0x00000040  /* Keyboard/mouse */
+#define IOC4_OTHER_IR_RESERVED          0x007fff80  /* Reserved */
+#define IOC4_OTHER_IR_RT_INT            0x00800000  /* INT_OUT section output */
+#define IOC4_OTHER_IR_GEN_INT           0xff000000  /* Generic pins */
+
+#define IOC4_OTHER_IR_SER_MEMERR (IOC4_OTHER_IR_S0_MEMERR | IOC4_OTHER_IR_S1_MEMERR | \
+                                  IOC4_OTHER_IR_S2_MEMERR | IOC4_OTHER_IR_S3_MEMERR)
+
+/* Bitmasks for IOC4_SIO_CR */
+#define IOC4_SIO_CR_CMD_PULSE_SHIFT              0  /* byte bus strobe shift */
+#define IOC4_SIO_CR_ARB_DIAG_TX0        0x00000000
+#define IOC4_SIO_CR_ARB_DIAG_RX0        0x00000010
+#define IOC4_SIO_CR_ARB_DIAG_TX1        0x00000020
+#define IOC4_SIO_CR_ARB_DIAG_RX1        0x00000030
+#define IOC4_SIO_CR_ARB_DIAG_TX2        0x00000040
+#define IOC4_SIO_CR_ARB_DIAG_RX2        0x00000050
+#define IOC4_SIO_CR_ARB_DIAG_TX3        0x00000060
+#define IOC4_SIO_CR_ARB_DIAG_RX3        0x00000070
+#define IOC4_SIO_CR_SIO_DIAG_IDLE       0x00000080  /* 0 -> active request among
+                                                           serial ports (ro) */
+/* Defs for some of the generic I/O pins */
+#define IOC4_GPCR_UART0_MODESEL    0x10 /* Pin is output to port 0
+                                                   mode sel */
+#define IOC4_GPCR_UART1_MODESEL    0x20 /* Pin is output to port 1
+                                                   mode sel */
+#define IOC4_GPCR_UART2_MODESEL    0x40 /* Pin is output to port 2
+                                                   mode sel */
+#define IOC4_GPCR_UART3_MODESEL    0x80 /* Pin is output to port 3
+                                                   mode sel */
+
+#define IOC4_GPPR_UART0_MODESEL_PIN   4 /* GIO pin controlling
+                                           uart 0 mode select */
+#define IOC4_GPPR_UART1_MODESEL_PIN   5 /* GIO pin controlling
+                                           uart 1 mode select */
+#define IOC4_GPPR_UART2_MODESEL_PIN   6 /* GIO pin controlling
+                                           uart 2 mode select */
+#define IOC4_GPPR_UART3_MODESEL_PIN   7 /* GIO pin controlling
+                                           uart 3 mode select */
+
+/* Bitmasks for serial RX status byte */
+#define IOC4_RXSB_OVERRUN       0x01    /* Char(s) lost */
+#define IOC4_RXSB_PAR_ERR       0x02    /* Parity error */
+#define IOC4_RXSB_FRAME_ERR     0x04    /* Framing error */
+#define IOC4_RXSB_BREAK         0x08    /* Break character */
+#define IOC4_RXSB_CTS           0x10    /* State of CTS */
+#define IOC4_RXSB_DCD           0x20    /* State of DCD */
+#define IOC4_RXSB_MODEM_VALID   0x40    /* DCD, CTS, and OVERRUN are valid */
+#define IOC4_RXSB_DATA_VALID    0x80    /* Data byte, FRAME_ERR PAR_ERR
+                                         * & BREAK valid */
+
+/* Bitmasks for serial TX control byte */
+#define IOC4_TXCB_INT_WHEN_DONE 0x20    /* Interrupt after this byte is sent */
+#define IOC4_TXCB_INVALID       0x00    /* Byte is invalid */
+#define IOC4_TXCB_VALID         0x40    /* Byte is valid */
+#define IOC4_TXCB_MCR           0x80    /* Data<7:0> to modem control reg */
+#define IOC4_TXCB_DELAY         0xc0    /* Delay data<7:0> mSec */
+
+/* Bitmasks for IOC4_SBBR_L */
+#define IOC4_SBBR_L_SIZE        0x00000001  /* 0 == 1KB rings, 1 == 4KB rings */
+
+/* Bitmasks for IOC4_SSCR_<3:0> */
+#define IOC4_SSCR_RX_THRESHOLD  0x000001ff  /* Hiwater mark */
+#define IOC4_SSCR_TX_TIMER_BUSY 0x00010000  /* TX timer in progress */
+#define IOC4_SSCR_HFC_EN        0x00020000  /* Hardware flow control enabled */
+#define IOC4_SSCR_RX_RING_DCD   0x00040000  /* Post RX record on delta-DCD */
+#define IOC4_SSCR_RX_RING_CTS   0x00080000  /* Post RX record on delta-CTS */
+#define IOC4_SSCR_DIAG          0x00200000  /* Bypass clock divider for sim */
+#define IOC4_SSCR_RX_DRAIN      0x08000000  /* Drain RX buffer to memory */
+#define IOC4_SSCR_DMA_EN        0x10000000  /* Enable ring buffer DMA */
+#define IOC4_SSCR_DMA_PAUSE     0x20000000  /* Pause DMA */
+#define IOC4_SSCR_PAUSE_STATE   0x40000000  /* Sets when PAUSE takes effect */
+#define IOC4_SSCR_RESET         0x80000000  /* Reset DMA channels */
+
+/* All producer/comsumer pointers are the same bitfield */
+#define IOC4_PROD_CONS_PTR_4K   0x00000ff8      /* For 4K buffers */
+#define IOC4_PROD_CONS_PTR_1K   0x000003f8      /* For 1K buffers */
+#define IOC4_PROD_CONS_PTR_OFF           3
+
+/* Bitmasks for IOC4_SRCIR_<3:0> */
+#define IOC4_SRCIR_ARM          0x80000000      /* Arm RX timer */
+
+/* Bitmasks for IOC4_SHADOW_<3:0> */
+#define IOC4_SHADOW_DR   0x00000001     /* Data ready */
+#define IOC4_SHADOW_OE   0x00000002     /* Overrun error */
+#define IOC4_SHADOW_PE   0x00000004     /* Parity error */
+#define IOC4_SHADOW_FE   0x00000008     /* Framing error */
+#define IOC4_SHADOW_BI   0x00000010     /* Break interrupt */
+#define IOC4_SHADOW_THRE 0x00000020     /* Xmit holding register empty */
+#define IOC4_SHADOW_TEMT 0x00000040     /* Xmit shift register empty */
+#define IOC4_SHADOW_RFCE 0x00000080     /* Char in RX fifo has an error */
+#define IOC4_SHADOW_DCTS 0x00010000     /* Delta clear to send */
+#define IOC4_SHADOW_DDCD 0x00080000     /* Delta data carrier detect */
+#define IOC4_SHADOW_CTS  0x00100000     /* Clear to send */
+#define IOC4_SHADOW_DCD  0x00800000     /* Data carrier detect */
+#define IOC4_SHADOW_DTR  0x01000000     /* Data terminal ready */
+#define IOC4_SHADOW_RTS  0x02000000     /* Request to send */
+#define IOC4_SHADOW_OUT1 0x04000000     /* 16550 OUT1 bit */
+#define IOC4_SHADOW_OUT2 0x08000000     /* 16550 OUT2 bit */
+#define IOC4_SHADOW_LOOP 0x10000000     /* Loopback enabled */
+
+/* Bitmasks for IOC4_SRTR_<3:0> */
+#define IOC4_SRTR_CNT           0x00000fff      /* Reload value for RX timer */
+#define IOC4_SRTR_CNT_VAL       0x0fff0000      /* Current value of RX timer */
+#define IOC4_SRTR_CNT_VAL_SHIFT         16
+#define IOC4_SRTR_HZ                 16000      /* SRTR clock frequency */
+
+/* Serial port register map used for DMA and PIO serial I/O */
+struct ioc4_serialregs {
+        uint32_t sscr;
+        uint32_t stpir;
+        uint32_t stcir;
+        uint32_t srpir;
+        uint32_t srcir;
+        uint32_t srtr;
+        uint32_t shadow;
+};
+
+/* IOC4 UART register map */
+struct ioc4_uartregs {
+        char i4u_lcr;
+        union {
+                char iir;       /* read only */
+                char fcr;       /* write only */
+        } u3;
+        union {
+                char ier;       /* DLAB == 0 */
+                char dlm;       /* DLAB == 1 */
+        } u2;
+        union {
+                char rbr;       /* read only, DLAB == 0 */
+                char thr;       /* write only, DLAB == 0 */
+                char dll;       /* DLAB == 1 */
+        } u1;
+        char i4u_scr;
+        char i4u_msr;
+        char i4u_lsr;
+        char i4u_mcr;
+};
+
+/* short names */
+#define i4u_dll u1.dll
+#define i4u_ier u2.ier
+#define i4u_dlm u2.dlm
+#define i4u_fcr u3.fcr
+
+/* Serial port registers used for DMA serial I/O */
+struct ioc4_serial {
+        uint32_t sbbr01_l;
+        uint32_t sbbr01_h;
+        uint32_t sbbr23_l;
+        uint32_t sbbr23_h;
+
+        struct ioc4_serialregs port_0;
+        struct ioc4_serialregs port_1;
+        struct ioc4_serialregs port_2;
+        struct ioc4_serialregs port_3;
+        struct ioc4_uartregs uart_0;
+        struct ioc4_uartregs uart_1;
+        struct ioc4_uartregs uart_2;
+        struct ioc4_uartregs uart_3;
+} ioc4_serial;
+
+/* UART clock speed */
+#define IOC4_SER_XIN_CLK_66     66666667
+#define IOC4_SER_XIN_CLK_33     33333333
+
+#define IOC4_W_IES              0
+#define IOC4_W_IEC              1
+
+typedef void ioc4_intr_func_f(void *, uint32_t);
+typedef ioc4_intr_func_f *ioc4_intr_func_t;
+
+static unsigned int Num_of_ioc4_cards;
+
+/* defining this will get you LOTS of great debug info */
+//#define DEBUG_INTERRUPTS
+#define DPRINT_CONFIG(_x...)    ;
+//#define DPRINT_CONFIG(_x...)  printk _x
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS    256
+
+/* number of characters we want to transmit to the lower level at a time */
+#define IOC4_MAX_CHARS  256
+#define IOC4_FIFO_CHARS 255
+
+/* Device name we're using */
+#define DEVICE_NAME_RS232  "ttyIOC"
+#define DEVICE_NAME_RS422  "ttyAIOC"
+#define DEVICE_MAJOR       204
+#define DEVICE_MINOR_RS232 50
+#define DEVICE_MINOR_RS422 84
+
+
+/* register offsets */
+#define IOC4_SERIAL_OFFSET      0x300
+
+/* flags for next_char_state */
+#define NCS_BREAK       0x1
+#define NCS_PARITY      0x2
+#define NCS_FRAMING     0x4
+#define NCS_OVERRUN     0x8
+
+/* cause we need SOME parameters ... */
+#define MIN_BAUD_SUPPORTED      1200
+#define MAX_BAUD_SUPPORTED      115200
+
+/* protocol types supported */
+#define PROTO_RS232     3
+#define PROTO_RS422     7
+
+/* Notification types */
+#define N_DATA_READY    0x01
+#define N_OUTPUT_LOWAT  0x02
+#define N_BREAK         0x04
+#define N_PARITY_ERROR  0x08
+#define N_FRAMING_ERROR 0x10
+#define N_OVERRUN_ERROR 0x20
+#define N_DDCD          0x40
+#define N_DCTS          0x80
+
+#define N_ALL_INPUT     (N_DATA_READY | N_BREAK |                       \
+                         N_PARITY_ERROR | N_FRAMING_ERROR |             \
+                         N_OVERRUN_ERROR | N_DDCD | N_DCTS)
+
+#define N_ALL_OUTPUT    N_OUTPUT_LOWAT
+
+#define N_ALL_ERRORS    (N_PARITY_ERROR | N_FRAMING_ERROR | N_OVERRUN_ERROR)
+
+#define N_ALL           (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK |      \
+                         N_PARITY_ERROR | N_FRAMING_ERROR |             \
+                         N_OVERRUN_ERROR | N_DDCD | N_DCTS)
+
+#define SER_DIVISOR(_x, clk)            (((clk) + (_x) * 8) / ((_x) * 16))
+#define DIVISOR_TO_BAUD(div, clk)       ((clk) / 16 / (div))
+
+/* Some masks */
+#define LCR_MASK_BITS_CHAR      (UART_LCR_WLEN5 | UART_LCR_WLEN6 \
+                                        | UART_LCR_WLEN7 | UART_LCR_WLEN8)
+#define LCR_MASK_STOP_BITS      (UART_LCR_STOP)
+
+#define PENDING(_p)     (readl(&(_p)->ip_mem->sio_ir.raw) & _p->ip_ienb)
+#define READ_SIO_IR(_p) readl(&(_p)->ip_mem->sio_ir.raw)
+
+/* Default to 4k buffers */
+#ifdef IOC4_1K_BUFFERS
+#define RING_BUF_SIZE 1024
+#define IOC4_BUF_SIZE_BIT 0
+#define PROD_CONS_MASK IOC4_PROD_CONS_PTR_1K
+#else
+#define RING_BUF_SIZE 4096
+#define IOC4_BUF_SIZE_BIT IOC4_SBBR_L_SIZE
+#define PROD_CONS_MASK IOC4_PROD_CONS_PTR_4K
+#endif
+
+#define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4)
+
+/*
+ * This is the entry saved by the driver - one per card
+ */
+
+#define UART_PORT_MIN           0
+#define UART_PORT_RS232         UART_PORT_MIN
+#define UART_PORT_RS422         1
+#define UART_PORT_COUNT         2       /* one for each mode */
+
+struct ioc4_control {
+        int ic_irq;
+        struct {
+                /* uart ports are allocated here - 1 for rs232, 1 for rs422 */
+                struct uart_port icp_uart_port[UART_PORT_COUNT];
+                /* Handy reference material */
+                struct ioc4_port *icp_port;
+        } ic_port[IOC4_NUM_SERIAL_PORTS];
+        struct ioc4_soft *ic_soft;
+};
+
+/*
+ * per-IOC4 data structure
+ */
+#define MAX_IOC4_INTR_ENTS      (8 * sizeof(uint32_t))
+struct ioc4_soft {
+        struct ioc4_misc_regs __iomem *is_ioc4_misc_addr;
+        struct ioc4_serial __iomem *is_ioc4_serial_addr;
+
+        /* Each interrupt type has an entry in the array */
+        struct ioc4_intr_type {
+
+                /*
+                 * Each in-use entry in this array contains at least
+                 * one nonzero bit in sd_bits; no two entries in this
+                 * array have overlapping sd_bits values.
+                 */
+                struct ioc4_intr_info {
+                        uint32_t sd_bits;
+                        ioc4_intr_func_f *sd_intr;
+                        void *sd_info;
+                } is_intr_info[MAX_IOC4_INTR_ENTS];
+
+                /* Number of entries active in the above array */
+                atomic_t is_num_intrs;
+        } is_intr_type[IOC4_NUM_INTR_TYPES];
+
+        /* is_ir_lock must be held while
+         * modifying sio_ie values, so
+         * we can be sure that sio_ie is
+         * not changing when we read it
+         * along with sio_ir.
+         */
+        spinlock_t is_ir_lock;  /* SIO_IE[SC] mod lock */
+};
+
+/* Local port info for each IOC4 serial ports */
+struct ioc4_port {
+        struct uart_port *ip_port;      /* current active port ptr */
+        /* Ptrs for all ports */
+        struct uart_port *ip_all_ports[UART_PORT_COUNT];
+        /* Back ptrs for this port */
+        struct ioc4_control *ip_control;
+        struct pci_dev *ip_pdev;
+        struct ioc4_soft *ip_ioc4_soft;
+
+        /* pci mem addresses */
+        struct ioc4_misc_regs __iomem *ip_mem;
+        struct ioc4_serial __iomem *ip_serial;
+        struct ioc4_serialregs __iomem *ip_serial_regs;
+        struct ioc4_uartregs __iomem *ip_uart_regs;
+
+        /* Ring buffer page for this port */
+        dma_addr_t ip_dma_ringbuf;
+        /* vaddr of ring buffer */
+        struct ring_buffer *ip_cpu_ringbuf;
+
+        /* Rings for this port */
+        struct ring *ip_inring;
+        struct ring *ip_outring;
+
+        /* Hook to port specific values */
+        struct hooks *ip_hooks;
+
+        spinlock_t ip_lock;
+
+        /* Various rx/tx parameters */
+        int ip_baud;
+        int ip_tx_lowat;
+        int ip_rx_timeout;
+
+        /* Copy of notification bits */
+        int ip_notify;
+
+        /* Shadow copies of various registers so we don't need to PIO
+         * read them constantly
+         */
+        uint32_t ip_ienb;       /* Enabled interrupts */
+        uint32_t ip_sscr;
+        uint32_t ip_tx_prod;
+        uint32_t ip_rx_cons;
+        int ip_pci_bus_speed;
+        unsigned char ip_flags;
+};
+
+/* tx low water mark.  We need to notify the driver whenever tx is getting
+ * close to empty so it can refill the tx buffer and keep things going.
+ * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll
+ * have no trouble getting in more chars in time (I certainly hope so).
+ */
+#define TX_LOWAT_LATENCY      1000
+#define TX_LOWAT_HZ          (1000000 / TX_LOWAT_LATENCY)
+#define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ)
+
+/* Flags per port */
+#define INPUT_HIGH      0x01
+#define DCD_ON          0x02
+#define LOWAT_WRITTEN   0x04
+#define READ_ABORTED    0x08
+#define PORT_ACTIVE     0x10
+#define PORT_INACTIVE   0       /* This is the value when "off" */
+
+
+/* Since each port has different register offsets and bitmasks
+ * for everything, we'll store those that we need in tables so we
+ * don't have to be constantly checking the port we are dealing with.
+ */
+struct hooks {
+        uint32_t intr_delta_dcd;
+        uint32_t intr_delta_cts;
+        uint32_t intr_tx_mt;
+        uint32_t intr_rx_timer;
+        uint32_t intr_rx_high;
+        uint32_t intr_tx_explicit;
+        uint32_t intr_dma_error;
+        uint32_t intr_clear;
+        uint32_t intr_all;
+        int rs422_select_pin;
+};
+
+static struct hooks hooks_array[IOC4_NUM_SERIAL_PORTS] = {
+        /* Values for port 0 */
+        {
+         IOC4_SIO_IR_S0_DELTA_DCD, IOC4_SIO_IR_S0_DELTA_CTS,
+         IOC4_SIO_IR_S0_TX_MT, IOC4_SIO_IR_S0_RX_TIMER,
+         IOC4_SIO_IR_S0_RX_HIGH, IOC4_SIO_IR_S0_TX_EXPLICIT,
+         IOC4_OTHER_IR_S0_MEMERR,
+         (IOC4_SIO_IR_S0_TX_MT | IOC4_SIO_IR_S0_RX_FULL |
+          IOC4_SIO_IR_S0_RX_HIGH | IOC4_SIO_IR_S0_RX_TIMER |
+          IOC4_SIO_IR_S0_DELTA_DCD | IOC4_SIO_IR_S0_DELTA_CTS |
+          IOC4_SIO_IR_S0_INT | IOC4_SIO_IR_S0_TX_EXPLICIT),
+         IOC4_SIO_IR_S0, IOC4_GPPR_UART0_MODESEL_PIN,
+         },
+
+        /* Values for port 1 */
+        {
+         IOC4_SIO_IR_S1_DELTA_DCD, IOC4_SIO_IR_S1_DELTA_CTS,
+         IOC4_SIO_IR_S1_TX_MT, IOC4_SIO_IR_S1_RX_TIMER,
+         IOC4_SIO_IR_S1_RX_HIGH, IOC4_SIO_IR_S1_TX_EXPLICIT,
+         IOC4_OTHER_IR_S1_MEMERR,
+         (IOC4_SIO_IR_S1_TX_MT | IOC4_SIO_IR_S1_RX_FULL |
+          IOC4_SIO_IR_S1_RX_HIGH | IOC4_SIO_IR_S1_RX_TIMER |
+          IOC4_SIO_IR_S1_DELTA_DCD | IOC4_SIO_IR_S1_DELTA_CTS |
+          IOC4_SIO_IR_S1_INT | IOC4_SIO_IR_S1_TX_EXPLICIT),
+         IOC4_SIO_IR_S1, IOC4_GPPR_UART1_MODESEL_PIN,
+         },
+
+        /* Values for port 2 */
+        {
+         IOC4_SIO_IR_S2_DELTA_DCD, IOC4_SIO_IR_S2_DELTA_CTS,
+         IOC4_SIO_IR_S2_TX_MT, IOC4_SIO_IR_S2_RX_TIMER,
+         IOC4_SIO_IR_S2_RX_HIGH, IOC4_SIO_IR_S2_TX_EXPLICIT,
+         IOC4_OTHER_IR_S2_MEMERR,
+         (IOC4_SIO_IR_S2_TX_MT | IOC4_SIO_IR_S2_RX_FULL |
+          IOC4_SIO_IR_S2_RX_HIGH | IOC4_SIO_IR_S2_RX_TIMER |
+          IOC4_SIO_IR_S2_DELTA_DCD | IOC4_SIO_IR_S2_DELTA_CTS |
+          IOC4_SIO_IR_S2_INT | IOC4_SIO_IR_S2_TX_EXPLICIT),
+         IOC4_SIO_IR_S2, IOC4_GPPR_UART2_MODESEL_PIN,
+         },
+
+        /* Values for port 3 */
+        {
+         IOC4_SIO_IR_S3_DELTA_DCD, IOC4_SIO_IR_S3_DELTA_CTS,
+         IOC4_SIO_IR_S3_TX_MT, IOC4_SIO_IR_S3_RX_TIMER,
+         IOC4_SIO_IR_S3_RX_HIGH, IOC4_SIO_IR_S3_TX_EXPLICIT,
+         IOC4_OTHER_IR_S3_MEMERR,
+         (IOC4_SIO_IR_S3_TX_MT | IOC4_SIO_IR_S3_RX_FULL |
+          IOC4_SIO_IR_S3_RX_HIGH | IOC4_SIO_IR_S3_RX_TIMER |
+          IOC4_SIO_IR_S3_DELTA_DCD | IOC4_SIO_IR_S3_DELTA_CTS |
+          IOC4_SIO_IR_S3_INT | IOC4_SIO_IR_S3_TX_EXPLICIT),
+         IOC4_SIO_IR_S3, IOC4_GPPR_UART3_MODESEL_PIN,
+         }
+};
+
+/* A ring buffer entry */
+struct ring_entry {
+        union {
+                struct {
+                        uint32_t alldata;
+                        uint32_t allsc;
+                } all;
+                struct {
+                        char data[4];   /* data bytes */
+                        char sc[4];     /* status/control */
+                } s;
+        } u;
+};
+
+/* Test the valid bits in any of the 4 sc chars using "allsc" member */
+#define RING_ANY_VALID \
+        ((uint32_t)(IOC4_RXSB_MODEM_VALID | IOC4_RXSB_DATA_VALID) * 0x01010101)
+
+#define ring_sc     u.s.sc
+#define ring_data   u.s.data
+#define ring_allsc  u.all.allsc
+
+/* Number of entries per ring buffer. */
+#define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry))
+
+/* An individual ring */
+struct ring {
+        struct ring_entry entries[ENTRIES_PER_RING];
+};
+
+/* The whole enchilada */
+struct ring_buffer {
+        struct ring TX_0_OR_2;
+        struct ring RX_0_OR_2;
+        struct ring TX_1_OR_3;
+        struct ring RX_1_OR_3;
+};
+
+/* Get a ring from a port struct */
+#define RING(_p, _wh)   &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh)
+
+/* Infinite loop detection.
+ */
+#define MAXITER 10000000
+
+/* Prototypes */
+static void receive_chars(struct uart_port *);
+static void handle_intr(void *arg, uint32_t sio_ir);
+
+/*
+ * port_is_active - determines if this port is currently active
+ * @port: ptr to soft struct for this port
+ * @uart_port: uart port to test for
+ */
+static inline int port_is_active(struct ioc4_port *port,
+                struct uart_port *uart_port)
+{
+        if (port) {
+                if ((port->ip_flags & PORT_ACTIVE)
+                                        && (port->ip_port == uart_port))
+                        return 1;
+        }
+        return 0;
+}
+
+
+/**
+ * write_ireg - write the interrupt regs
+ * @ioc4_soft: ptr to soft struct for this port
+ * @val: value to write
+ * @which: which register
+ * @type: which ireg set
+ */
+static inline void
+write_ireg(struct ioc4_soft *ioc4_soft, uint32_t val, int which, int type)
+{
+        struct ioc4_misc_regs __iomem *mem = ioc4_soft->is_ioc4_misc_addr;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ioc4_soft->is_ir_lock, flags);
+
+        switch (type) {
+        case IOC4_SIO_INTR_TYPE:
+                switch (which) {
+                case IOC4_W_IES:
+                        writel(val, &mem->sio_ies.raw);
+                        break;
+
+                case IOC4_W_IEC:
+                        writel(val, &mem->sio_iec.raw);
+                        break;
+                }
+                break;
+
+        case IOC4_OTHER_INTR_TYPE:
+                switch (which) {
+                case IOC4_W_IES:
+                        writel(val, &mem->other_ies.raw);
+                        break;
+
+                case IOC4_W_IEC:
+                        writel(val, &mem->other_iec.raw);
+                        break;
+                }
+                break;
+
+        default:
+                break;
+        }
+        spin_unlock_irqrestore(&ioc4_soft->is_ir_lock, flags);
+}
+
+/**
+ * set_baud - Baud rate setting code
+ * @port: port to set
+ * @baud: baud rate to use
+ */
+static int set_baud(struct ioc4_port *port, int baud)
+{
+        int actual_baud;
+        int diff;
+        int lcr;
+        unsigned short divisor;
+        struct ioc4_uartregs __iomem *uart;
+
+        divisor = SER_DIVISOR(baud, port->ip_pci_bus_speed);
+        if (!divisor)
+                return 1;
+        actual_baud = DIVISOR_TO_BAUD(divisor, port->ip_pci_bus_speed);
+
+        diff = actual_baud - baud;
+        if (diff < 0)
+                diff = -diff;
+
+        /* If we're within 1%, we've found a match */
+        if (diff * 100 > actual_baud)
+                return 1;
+
+        uart = port->ip_uart_regs;
+        lcr = readb(&uart->i4u_lcr);
+        writeb(lcr | UART_LCR_DLAB, &uart->i4u_lcr);
+        writeb((unsigned char)divisor, &uart->i4u_dll);
+        writeb((unsigned char)(divisor >> 8), &uart->i4u_dlm);
+        writeb(lcr, &uart->i4u_lcr);
+        return 0;
+}
+
+
+/**
+ * get_ioc4_port - given a uart port, return the control structure
+ * @port: uart port
+ * @set: set this port as current
+ */
+static struct ioc4_port *get_ioc4_port(struct uart_port *the_port, int set)
+{
+        struct ioc4_driver_data *idd = dev_get_drvdata(the_port->dev);
+        struct ioc4_control *control = idd->idd_serial_data;
+        struct ioc4_port *port;
+        int port_num, port_type;
+
+        if (control) {
+                for ( port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS;
+                                                        port_num++ ) {
+                        port = control->ic_port[port_num].icp_port;
+                        if (!port)
+                                continue;
+                        for (port_type = UART_PORT_MIN;
+                                                port_type < UART_PORT_COUNT;
+                                                port_type++) {
+                                if (the_port == port->ip_all_ports
+                                                        [port_type]) {
+                                        /* set local copy */
+                                        if (set) {
+                                                port->ip_port = the_port;
+                                        }
+                                        return port;
+                                }
+                        }
+                }
+        }
+        return NULL;
+}
+
+/* The IOC4 hardware provides no atomic way to determine if interrupts
+ * are pending since two reads are required to do so.  The handler must
+ * read the SIO_IR and the SIO_IES, and take the logical and of the
+ * two.  When this value is zero, all interrupts have been serviced and
+ * the handler may return.
+ *
+ * This has the unfortunate "hole" that, if some other CPU or
+ * some other thread or some higher level interrupt manages to
+ * modify SIO_IE between our reads of SIO_IR and SIO_IE, we may
+ * think we have observed SIO_IR&SIO_IE==0 when in fact this
+ * condition never really occurred.
+ *
+ * To solve this, we use a simple spinlock that must be held
+ * whenever modifying SIO_IE; holding this lock while observing
+ * both SIO_IR and SIO_IE guarantees that we do not falsely
+ * conclude that no enabled interrupts are pending.
+ */
+
+static inline uint32_t
+pending_intrs(struct ioc4_soft *soft, int type)
+{
+        struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
+        unsigned long flag;
+        uint32_t intrs = 0;
+
+        BUG_ON(!((type == IOC4_SIO_INTR_TYPE)
+               || (type == IOC4_OTHER_INTR_TYPE)));
+
+        spin_lock_irqsave(&soft->is_ir_lock, flag);
+
+        switch (type) {
+        case IOC4_SIO_INTR_TYPE:
+                intrs = readl(&mem->sio_ir.raw) & readl(&mem->sio_ies.raw);
+                break;
+
+        case IOC4_OTHER_INTR_TYPE:
+                intrs = readl(&mem->other_ir.raw) & readl(&mem->other_ies.raw);
+
+                /* Don't process any ATA interrupte */
+                intrs &= ~(IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR);
+                break;
+
+        default:
+                break;
+        }
+        spin_unlock_irqrestore(&soft->is_ir_lock, flag);
+        return intrs;
+}
+
+/**
+ * port_init - Initialize the sio and ioc4 hardware for a given port
+ *                      called per port from attach...
+ * @port: port to initialize
+ */
+static int inline port_init(struct ioc4_port *port)
+{
+        uint32_t sio_cr;
+        struct hooks *hooks = port->ip_hooks;
+        struct ioc4_uartregs __iomem *uart;
+
+        /* Idle the IOC4 serial interface */
+        writel(IOC4_SSCR_RESET, &port->ip_serial_regs->sscr);
+
+        /* Wait until any pending bus activity for this port has ceased */
+        do
+                sio_cr = readl(&port->ip_mem->sio_cr.raw);
+        while (!(sio_cr & IOC4_SIO_CR_SIO_DIAG_IDLE));
+
+        /* Finish reset sequence */
+        writel(0, &port->ip_serial_regs->sscr);
+
+        /* Once RESET is done, reload cached tx_prod and rx_cons values
+         * and set rings to empty by making prod == cons
+         */
+        port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
+        writel(port->ip_tx_prod, &port->ip_serial_regs->stpir);
+        port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+        writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir);
+
+        /* Disable interrupts for this 16550 */
+        uart = port->ip_uart_regs;
+        writeb(0, &uart->i4u_lcr);
+        writeb(0, &uart->i4u_ier);
+
+        /* Set the default baud */
+        set_baud(port, port->ip_baud);
+
+        /* Set line control to 8 bits no parity */
+        writeb(UART_LCR_WLEN8 | 0, &uart->i4u_lcr);
+                                        /* UART_LCR_STOP == 1 stop */
+
+        /* Enable the FIFOs */
+        writeb(UART_FCR_ENABLE_FIFO, &uart->i4u_fcr);
+        /* then reset 16550 FIFOs */
+        writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+                        &uart->i4u_fcr);
+
+        /* Clear modem control register */
+        writeb(0, &uart->i4u_mcr);
+
+        /* Clear deltas in modem status register */
+        readb(&uart->i4u_msr);
+
+        /* Only do this once per port pair */
+        if (port->ip_hooks == &hooks_array[0]
+                            || port->ip_hooks == &hooks_array[2]) {
+                unsigned long ring_pci_addr;
+                uint32_t __iomem *sbbr_l;
+                uint32_t __iomem *sbbr_h;
+
+                if (port->ip_hooks == &hooks_array[0]) {
+                        sbbr_l = &port->ip_serial->sbbr01_l;
+                        sbbr_h = &port->ip_serial->sbbr01_h;
+                } else {
+                        sbbr_l = &port->ip_serial->sbbr23_l;
+                        sbbr_h = &port->ip_serial->sbbr23_h;
+                }
+
+                ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf;
+                DPRINT_CONFIG(("%s: ring_pci_addr 0x%lx\n",
+                                        __func__, ring_pci_addr));
+
+                writel((unsigned int)((uint64_t)ring_pci_addr >> 32), sbbr_h);
+                writel((unsigned int)ring_pci_addr | IOC4_BUF_SIZE_BIT, sbbr_l);
+        }
+
+        /* Set the receive timeout value to 10 msec */
+        writel(IOC4_SRTR_HZ / 100, &port->ip_serial_regs->srtr);
+
+        /* Set rx threshold, enable DMA */
+        /* Set high water mark at 3/4 of full ring */
+        port->ip_sscr = (ENTRIES_PER_RING * 3 / 4);
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+        /* Disable and clear all serial related interrupt bits */
+        write_ireg(port->ip_ioc4_soft, hooks->intr_clear,
+                       IOC4_W_IEC, IOC4_SIO_INTR_TYPE);
+        port->ip_ienb &= ~hooks->intr_clear;
+        writel(hooks->intr_clear, &port->ip_mem->sio_ir.raw);
+        return 0;
+}
+
+/**
+ * handle_dma_error_intr - service any pending DMA error interrupts for the
+ *                      given port - 2nd level called via sd_intr
+ * @arg: handler arg
+ * @other_ir: ioc4regs
+ */
+static void handle_dma_error_intr(void *arg, uint32_t other_ir)
+{
+        struct ioc4_port *port = (struct ioc4_port *)arg;
+        struct hooks *hooks = port->ip_hooks;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->ip_lock, flags);
+
+        /* ACK the interrupt */
+        writel(hooks->intr_dma_error, &port->ip_mem->other_ir.raw);
+
+        if (readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_VLD) {
+                printk(KERN_ERR
+                        "PCI error address is 0x%llx, "
+                                "master is serial port %c %s\n",
+                     (((uint64_t)readl(&port->ip_mem->pci_err_addr_h)
+                                                         << 32)
+                                | readl(&port->ip_mem->pci_err_addr_l.raw))
+                                        & IOC4_PCI_ERR_ADDR_ADDR_MSK, '1' +
+                     ((char)(readl(&port->ip_mem->pci_err_addr_l.raw) &
+                             IOC4_PCI_ERR_ADDR_MST_NUM_MSK) >> 1),
+                     (readl(&port->ip_mem->pci_err_addr_l.raw)
+                                & IOC4_PCI_ERR_ADDR_MST_TYP_MSK)
+                                ? "RX" : "TX");
+
+                if (readl(&port->ip_mem->pci_err_addr_l.raw)
+                                                & IOC4_PCI_ERR_ADDR_MUL_ERR) {
+                        printk(KERN_ERR
+                                "Multiple errors occurred\n");
+                }
+        }
+        spin_unlock_irqrestore(&port->ip_lock, flags);
+
+        /* Re-enable DMA error interrupts */
+        write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, IOC4_W_IES,
+                                                IOC4_OTHER_INTR_TYPE);
+}
+
+/**
+ * intr_connect - interrupt connect function
+ * @soft: soft struct for this card
+ * @type: interrupt type
+ * @intrbits: bit pattern to set
+ * @intr: handler function
+ * @info: handler arg
+ */
+static void
+intr_connect(struct ioc4_soft *soft, int type,
+                  uint32_t intrbits, ioc4_intr_func_f * intr, void *info)
+{
+        int i;
+        struct ioc4_intr_info *intr_ptr;
+
+        BUG_ON(!((type == IOC4_SIO_INTR_TYPE)
+               || (type == IOC4_OTHER_INTR_TYPE)));
+
+        i = atomic_inc(&soft-> is_intr_type[type].is_num_intrs) - 1;
+        BUG_ON(!(i < MAX_IOC4_INTR_ENTS || (printk("i %d\n", i), 0)));
+
+        /* Save off the lower level interrupt handler */
+        intr_ptr = &soft->is_intr_type[type].is_intr_info[i];
+        intr_ptr->sd_bits = intrbits;
+        intr_ptr->sd_intr = intr;
+        intr_ptr->sd_info = info;
+}
+
+/**
+ * ioc4_intr - Top level IOC4 interrupt handler.
+ * @irq: irq value
+ * @arg: handler arg
+ */
+
+static irqreturn_t ioc4_intr(int irq, void *arg)
+{
+        struct ioc4_soft *soft;
+        uint32_t this_ir, this_mir;
+        int xx, num_intrs = 0;
+        int intr_type;
+        int handled = 0;
+        struct ioc4_intr_info *intr_info;
+
+        soft = arg;
+        for (intr_type = 0; intr_type < IOC4_NUM_INTR_TYPES; intr_type++) {
+                num_intrs = (int)atomic_read(
+                                &soft->is_intr_type[intr_type].is_num_intrs);
+
+                this_mir = this_ir = pending_intrs(soft, intr_type);
+
+                /* Farm out the interrupt to the various drivers depending on
+                 * which interrupt bits are set.
+                 */
+                for (xx = 0; xx < num_intrs; xx++) {
+                        intr_info = &soft->is_intr_type[intr_type].is_intr_info[xx];
+                        if ((this_mir = this_ir & intr_info->sd_bits)) {
+                                /* Disable owned interrupts, call handler */
+                                handled++;
+                                write_ireg(soft, intr_info->sd_bits, IOC4_W_IEC,
+                                                                intr_type);
+                                intr_info->sd_intr(intr_info->sd_info, this_mir);
+                                this_ir &= ~this_mir;
+                        }
+                }
+        }
+#ifdef DEBUG_INTERRUPTS
+        {
+                struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
+                unsigned long flag;
+
+                spin_lock_irqsave(&soft->is_ir_lock, flag);
+                printk ("%s : %d : mem 0x%p sio_ir 0x%x sio_ies 0x%x "
+                                "other_ir 0x%x other_ies 0x%x mask 0x%x\n",
+                     __func__, __LINE__,
+                     (void *)mem, readl(&mem->sio_ir.raw),
+                     readl(&mem->sio_ies.raw),
+                     readl(&mem->other_ir.raw),
+                     readl(&mem->other_ies.raw),
+                     IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR);
+                spin_unlock_irqrestore(&soft->is_ir_lock, flag);
+        }
+#endif
+        return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/**
+ * ioc4_attach_local - Device initialization.
+ *                      Called at *_attach() time for each
+ *                      IOC4 with serial ports in the system.
+ * @idd: Master module data for this IOC4
+ */
+static int inline ioc4_attach_local(struct ioc4_driver_data *idd)
+{
+        struct ioc4_port *port;
+        struct ioc4_port *ports[IOC4_NUM_SERIAL_PORTS];
+        int port_number;
+        uint16_t ioc4_revid_min = 62;
+        uint16_t ioc4_revid;
+        struct pci_dev *pdev = idd->idd_pdev;
+        struct ioc4_control* control = idd->idd_serial_data;
+        struct ioc4_soft *soft = control->ic_soft;
+        void __iomem *ioc4_misc = idd->idd_misc_regs;
+        void __iomem *ioc4_serial = soft->is_ioc4_serial_addr;
+
+        /* IOC4 firmware must be at least rev 62 */
+        pci_read_config_word(pdev, PCI_COMMAND_SPECIAL, &ioc4_revid);
+
+        printk(KERN_INFO "IOC4 firmware revision %d\n", ioc4_revid);
+        if (ioc4_revid < ioc4_revid_min) {
+                printk(KERN_WARNING
+                    "IOC4 serial not supported on firmware rev %d, "
+                                "please upgrade to rev %d or higher\n",
+                                ioc4_revid, ioc4_revid_min);
+                return -EPERM;
+        }
+        BUG_ON(ioc4_misc == NULL);
+        BUG_ON(ioc4_serial == NULL);
+
+        /* Create port structures for each port */
+        for (port_number = 0; port_number < IOC4_NUM_SERIAL_PORTS;
+                                                        port_number++) {
+                port = kzalloc(sizeof(struct ioc4_port), GFP_KERNEL);
+                if (!port) {
+                        printk(KERN_WARNING
+                                "IOC4 serial memory not available for port\n");
+                        return -ENOMEM;
+                }
+                spin_lock_init(&port->ip_lock);
+
+                /* we need to remember the previous ones, to point back to
+                 * them farther down - setting up the ring buffers.
+                 */
+                ports[port_number] = port;
+
+                /* Allocate buffers and jumpstart the hardware.  */
+                control->ic_port[port_number].icp_port = port;
+                port->ip_ioc4_soft = soft;
+                port->ip_pdev = pdev;
+                port->ip_ienb = 0;
+                /* Use baud rate calculations based on detected PCI
+                 * bus speed.  Simply test whether the PCI clock is
+                 * running closer to 66MHz or 33MHz.
+                 */
+                if (idd->count_period/IOC4_EXTINT_COUNT_DIVISOR < 20) {
+                        port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_66;
+                } else {
+                        port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_33;
+                }
+                port->ip_baud = 9600;
+                port->ip_control = control;
+                port->ip_mem = ioc4_misc;
+                port->ip_serial = ioc4_serial;
+
+                /* point to the right hook */
+                port->ip_hooks = &hooks_array[port_number];
+
+                /* Get direct hooks to the serial regs and uart regs
+                 * for this port
+                 */
+                switch (port_number) {
+                case 0:
+                        port->ip_serial_regs = &(port->ip_serial->port_0);
+                        port->ip_uart_regs = &(port->ip_serial->uart_0);
+                        break;
+                case 1:
+                        port->ip_serial_regs = &(port->ip_serial->port_1);
+                        port->ip_uart_regs = &(port->ip_serial->uart_1);
+                        break;
+                case 2:
+                        port->ip_serial_regs = &(port->ip_serial->port_2);
+                        port->ip_uart_regs = &(port->ip_serial->uart_2);
+                        break;
+                default:
+                case 3:
+                        port->ip_serial_regs = &(port->ip_serial->port_3);
+                        port->ip_uart_regs = &(port->ip_serial->uart_3);
+                        break;
+                }
+
+                /* ring buffers are 1 to a pair of ports */
+                if (port_number && (port_number & 1)) {
+                        /* odd use the evens buffer */
+                        port->ip_dma_ringbuf =
+                                        ports[port_number - 1]->ip_dma_ringbuf;
+                        port->ip_cpu_ringbuf =
+                                        ports[port_number - 1]->ip_cpu_ringbuf;
+                        port->ip_inring = RING(port, RX_1_OR_3);
+                        port->ip_outring = RING(port, TX_1_OR_3);
+
+                } else {
+                        if (port->ip_dma_ringbuf == 0) {
+                                port->ip_cpu_ringbuf = pci_alloc_consistent
+                                        (pdev, TOTAL_RING_BUF_SIZE,
+                                        &port->ip_dma_ringbuf);
+
+                        }
+                        BUG_ON(!((((int64_t)port->ip_dma_ringbuf) &
+                                (TOTAL_RING_BUF_SIZE - 1)) == 0));
+                        DPRINT_CONFIG(("%s : ip_cpu_ringbuf 0x%p "
+                                                "ip_dma_ringbuf 0x%p\n",
+                                        __func__,
+                                        (void *)port->ip_cpu_ringbuf,
+                                        (void *)port->ip_dma_ringbuf));
+                        port->ip_inring = RING(port, RX_0_OR_2);
+                        port->ip_outring = RING(port, TX_0_OR_2);
+                }
+                DPRINT_CONFIG(("%s : port %d [addr 0x%p] control 0x%p",
+                                __func__,
+                                port_number, (void *)port, (void *)control));
+                DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n",
+                                (void *)port->ip_serial_regs,
+                                (void *)port->ip_uart_regs));
+
+                /* Initialize the hardware for IOC4 */
+                port_init(port);
+
+                DPRINT_CONFIG(("%s: port_number %d port 0x%p inring 0x%p "
+                                                "outring 0x%p\n",
+                                __func__,
+                                port_number, (void *)port,
+                                (void *)port->ip_inring,
+                                (void *)port->ip_outring));
+
+                /* Attach interrupt handlers */
+                intr_connect(soft, IOC4_SIO_INTR_TYPE,
+                                GET_SIO_IR(port_number),
+                                handle_intr, port);
+
+                intr_connect(soft, IOC4_OTHER_INTR_TYPE,
+                                GET_OTHER_IR(port_number),
+                                handle_dma_error_intr, port);
+        }
+        return 0;
+}
+
+/**
+ * enable_intrs - enable interrupts
+ * @port: port to enable
+ * @mask: mask to use
+ */
+static void enable_intrs(struct ioc4_port *port, uint32_t mask)
+{
+        struct hooks *hooks = port->ip_hooks;
+
+        if ((port->ip_ienb & mask) != mask) {
+                write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IES,
+                                                IOC4_SIO_INTR_TYPE);
+                port->ip_ienb |= mask;
+        }
+
+        if (port->ip_ienb)
+                write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error,
+                                IOC4_W_IES, IOC4_OTHER_INTR_TYPE);
+}
+
+/**
+ * local_open - local open a port
+ * @port: port to open
+ */
+static inline int local_open(struct ioc4_port *port)
+{
+        int spiniter = 0;
+
+        port->ip_flags = PORT_ACTIVE;
+
+        /* Pause the DMA interface if necessary */
+        if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
+                writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
+                        &port->ip_serial_regs->sscr);
+                while((readl(&port->ip_serial_regs-> sscr)
+                                & IOC4_SSCR_PAUSE_STATE) == 0) {
+                        spiniter++;
+                        if (spiniter > MAXITER) {
+                                port->ip_flags = PORT_INACTIVE;
+                                return -1;
+                        }
+                }
+        }
+
+        /* Reset the input fifo.  If the uart received chars while the port
+         * was closed and DMA is not enabled, the uart may have a bunch of
+         * chars hanging around in its rx fifo which will not be discarded
+         * by rclr in the upper layer. We must get rid of them here.
+         */
+        writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR,
+                                &port->ip_uart_regs->i4u_fcr);
+
+        writeb(UART_LCR_WLEN8, &port->ip_uart_regs->i4u_lcr);
+                                        /* UART_LCR_STOP == 1 stop */
+
+        /* Re-enable DMA, set default threshold to intr whenever there is
+         * data available.
+         */
+        port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD;
+        port->ip_sscr |= 1;     /* default threshold */
+
+        /* Plug in the new sscr.  This implicitly clears the DMA_PAUSE
+         * flag if it was set above
+         */
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        port->ip_tx_lowat = 1;
+        return 0;
+}
+
+/**
+ * set_rx_timeout - Set rx timeout and threshold values.
+ * @port: port to use
+ * @timeout: timeout value in ticks
+ */
+static inline int set_rx_timeout(struct ioc4_port *port, int timeout)
+{
+        int threshold;
+
+        port->ip_rx_timeout = timeout;
+
+        /* Timeout is in ticks.  Let's figure out how many chars we
+         * can receive at the current baud rate in that interval
+         * and set the rx threshold to that amount.  There are 4 chars
+         * per ring entry, so we'll divide the number of chars that will
+         * arrive in timeout by 4.
+         * So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
+         */
+        threshold = timeout * port->ip_baud / 4000;
+        if (threshold == 0)
+                threshold = 1;  /* otherwise we'll intr all the time! */
+
+        if ((unsigned)threshold > (unsigned)IOC4_SSCR_RX_THRESHOLD)
+                return 1;
+
+        port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD;
+        port->ip_sscr |= threshold;
+
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+        /* Now set the rx timeout to the given value
+         * again timeout * IOC4_SRTR_HZ / HZ
+         */
+        timeout = timeout * IOC4_SRTR_HZ / 100;
+        if (timeout > IOC4_SRTR_CNT)
+                timeout = IOC4_SRTR_CNT;
+
+        writel(timeout, &port->ip_serial_regs->srtr);
+        return 0;
+}
+
+/**
+ * config_port - config the hardware
+ * @port: port to config
+ * @baud: baud rate for the port
+ * @byte_size: data size
+ * @stop_bits: number of stop bits
+ * @parenb: parity enable ?
+ * @parodd: odd parity ?
+ */
+static inline int
+config_port(struct ioc4_port *port,
+            int baud, int byte_size, int stop_bits, int parenb, int parodd)
+{
+        char lcr, sizebits;
+        int spiniter = 0;
+
+        DPRINT_CONFIG(("%s: baud %d byte_size %d stop %d parenb %d parodd %d\n",
+                __func__, baud, byte_size, stop_bits, parenb, parodd));
+
+        if (set_baud(port, baud))
+                return 1;
+
+        switch (byte_size) {
+        case 5:
+                sizebits = UART_LCR_WLEN5;
+                break;
+        case 6:
+                sizebits = UART_LCR_WLEN6;
+                break;
+        case 7:
+                sizebits = UART_LCR_WLEN7;
+                break;
+        case 8:
+                sizebits = UART_LCR_WLEN8;
+                break;
+        default:
+                return 1;
+        }
+
+        /* Pause the DMA interface if necessary */
+        if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
+                writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
+                        &port->ip_serial_regs->sscr);
+                while((readl(&port->ip_serial_regs->sscr)
+                                                & IOC4_SSCR_PAUSE_STATE) == 0) {
+                        spiniter++;
+                        if (spiniter > MAXITER)
+                                return -1;
+                }
+        }
+
+        /* Clear relevant fields in lcr */
+        lcr = readb(&port->ip_uart_regs->i4u_lcr);
+        lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR |
+                 UART_LCR_PARITY | LCR_MASK_STOP_BITS);
+
+        /* Set byte size in lcr */
+        lcr |= sizebits;
+
+        /* Set parity */
+        if (parenb) {
+                lcr |= UART_LCR_PARITY;
+                if (!parodd)
+                        lcr |= UART_LCR_EPAR;
+        }
+
+        /* Set stop bits */
+        if (stop_bits)
+                lcr |= UART_LCR_STOP /* 2 stop bits */ ;
+
+        writeb(lcr, &port->ip_uart_regs->i4u_lcr);
+
+        /* Re-enable the DMA interface if necessary */
+        if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
+                writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        }
+        port->ip_baud = baud;
+
+        /* When we get within this number of ring entries of filling the
+         * entire ring on tx, place an EXPLICIT intr to generate a lowat
+         * notification when output has drained.
+         */
+        port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4;
+        if (port->ip_tx_lowat == 0)
+                port->ip_tx_lowat = 1;
+
+        set_rx_timeout(port, 2);
+
+        return 0;
+}
+
+/**
+ * do_write - Write bytes to the port.  Returns the number of bytes
+ *                      actually written. Called from transmit_chars
+ * @port: port to use
+ * @buf: the stuff to write
+ * @len: how many bytes in 'buf'
+ */
+static inline int do_write(struct ioc4_port *port, char *buf, int len)
+{
+        int prod_ptr, cons_ptr, total = 0;
+        struct ring *outring;
+        struct ring_entry *entry;
+        struct hooks *hooks = port->ip_hooks;
+
+        BUG_ON(!(len >= 0));
+
+        prod_ptr = port->ip_tx_prod;
+        cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
+        outring = port->ip_outring;
+
+        /* Maintain a 1-entry red-zone.  The ring buffer is full when
+         * (cons - prod) % ring_size is 1.  Rather than do this subtraction
+         * in the body of the loop, I'll do it now.
+         */
+        cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK;
+
+        /* Stuff the bytes into the output */
+        while ((prod_ptr != cons_ptr) && (len > 0)) {
+                int xx;
+
+                /* Get 4 bytes (one ring entry) at a time */
+                entry = (struct ring_entry *)((caddr_t) outring + prod_ptr);
+
+                /* Invalidate all entries */
+                entry->ring_allsc = 0;
+
+                /* Copy in some bytes */
+                for (xx = 0; (xx < 4) && (len > 0); xx++) {
+                        entry->ring_data[xx] = *buf++;
+                        entry->ring_sc[xx] = IOC4_TXCB_VALID;
+                        len--;
+                        total++;
+                }
+
+                /* If we are within some small threshold of filling up the
+                 * entire ring buffer, we must place an EXPLICIT intr here
+                 * to generate a lowat interrupt in case we subsequently
+                 * really do fill up the ring and the caller goes to sleep.
+                 * No need to place more than one though.
+                 */
+                if (!(port->ip_flags & LOWAT_WRITTEN) &&
+                        ((cons_ptr - prod_ptr) & PROD_CONS_MASK)
+                                <= port->ip_tx_lowat
+                                        * (int)sizeof(struct ring_entry)) {
+                        port->ip_flags |= LOWAT_WRITTEN;
+                        entry->ring_sc[0] |= IOC4_TXCB_INT_WHEN_DONE;
+                }
+
+                /* Go on to next entry */
+                prod_ptr += sizeof(struct ring_entry);
+                prod_ptr &= PROD_CONS_MASK;
+        }
+
+        /* If we sent something, start DMA if necessary */
+        if (total > 0 && !(port->ip_sscr & IOC4_SSCR_DMA_EN)) {
+                port->ip_sscr |= IOC4_SSCR_DMA_EN;
+                writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        }
+
+        /* Store the new producer pointer.  If tx is disabled, we stuff the
+         * data into the ring buffer, but we don't actually start tx.
+         */
+        if (!uart_tx_stopped(port->ip_port)) {
+                writel(prod_ptr, &port->ip_serial_regs->stpir);
+
+                /* If we are now transmitting, enable tx_mt interrupt so we
+                 * can disable DMA if necessary when the tx finishes.
+                 */
+                if (total > 0)
+                        enable_intrs(port, hooks->intr_tx_mt);
+        }
+        port->ip_tx_prod = prod_ptr;
+        return total;
+}
+
+/**
+ * disable_intrs - disable interrupts
+ * @port: port to enable
+ * @mask: mask to use
+ */
+static void disable_intrs(struct ioc4_port *port, uint32_t mask)
+{
+        struct hooks *hooks = port->ip_hooks;
+
+        if (port->ip_ienb & mask) {
+                write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IEC,
+                                        IOC4_SIO_INTR_TYPE);
+                port->ip_ienb &= ~mask;
+        }
+
+        if (!port->ip_ienb)
+                write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error,
+                                IOC4_W_IEC, IOC4_OTHER_INTR_TYPE);
+}
+
+/**
+ * set_notification - Modify event notification
+ * @port: port to use
+ * @mask: events mask
+ * @set_on: set ?
+ */
+static int set_notification(struct ioc4_port *port, int mask, int set_on)
+{
+        struct hooks *hooks = port->ip_hooks;
+        uint32_t intrbits, sscrbits;
+
+        BUG_ON(!mask);
+
+        intrbits = sscrbits = 0;
+
+        if (mask & N_DATA_READY)
+                intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high);
+        if (mask & N_OUTPUT_LOWAT)
+                intrbits |= hooks->intr_tx_explicit;
+        if (mask & N_DDCD) {
+                intrbits |= hooks->intr_delta_dcd;
+                sscrbits |= IOC4_SSCR_RX_RING_DCD;
+        }
+        if (mask & N_DCTS)
+                intrbits |= hooks->intr_delta_cts;
+
+        if (set_on) {
+                enable_intrs(port, intrbits);
+                port->ip_notify |= mask;
+                port->ip_sscr |= sscrbits;
+        } else {
+                disable_intrs(port, intrbits);
+                port->ip_notify &= ~mask;
+                port->ip_sscr &= ~sscrbits;
+        }
+
+        /* We require DMA if either DATA_READY or DDCD notification is
+         * currently requested. If neither of these is requested and
+         * there is currently no tx in progress, DMA may be disabled.
+         */
+        if (port->ip_notify & (N_DATA_READY | N_DDCD))
+                port->ip_sscr |= IOC4_SSCR_DMA_EN;
+        else if (!(port->ip_ienb & hooks->intr_tx_mt))
+                port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
+
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        return 0;
+}
+
+/**
+ * set_mcr - set the master control reg
+ * @the_port: port to use
+ * @mask1: mcr mask
+ * @mask2: shadow mask
+ */
+static inline int set_mcr(struct uart_port *the_port,
+                int mask1, int mask2)
+{
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+        uint32_t shadow;
+        int spiniter = 0;
+        char mcr;
+
+        if (!port)
+                return -1;
+
+        /* Pause the DMA interface if necessary */
+        if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
+                writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
+                        &port->ip_serial_regs->sscr);
+                while ((readl(&port->ip_serial_regs->sscr)
+                                        & IOC4_SSCR_PAUSE_STATE) == 0) {
+                        spiniter++;
+                        if (spiniter > MAXITER)
+                                return -1;
+                }
+        }
+        shadow = readl(&port->ip_serial_regs->shadow);
+        mcr = (shadow & 0xff000000) >> 24;
+
+        /* Set new value */
+        mcr |= mask1;
+        shadow |= mask2;
+
+        writeb(mcr, &port->ip_uart_regs->i4u_mcr);
+        writel(shadow, &port->ip_serial_regs->shadow);
+
+        /* Re-enable the DMA interface if necessary */
+        if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
+                writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+        }
+        return 0;
+}
+
+/**
+ * ioc4_set_proto - set the protocol for the port
+ * @port: port to use
+ * @proto: protocol to use
+ */
+static int ioc4_set_proto(struct ioc4_port *port, int proto)
+{
+        struct hooks *hooks = port->ip_hooks;
+
+        switch (proto) {
+        case PROTO_RS232:
+                /* Clear the appropriate GIO pin */
+                writel(0, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw));
+                break;
+
+        case PROTO_RS422:
+                /* Set the appropriate GIO pin */
+                writel(1, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw));
+                break;
+
+        default:
+                return 1;
+        }
+        return 0;
+}
+
+/**
+ * transmit_chars - upper level write, called with ip_lock
+ * @the_port: port to write
+ */
+static void transmit_chars(struct uart_port *the_port)
+{
+        int xmit_count, tail, head;
+        int result;
+        char *start;
+        struct tty_struct *tty;
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+        struct uart_state *state;
+
+        if (!the_port)
+                return;
+        if (!port)
+                return;
+
+        state = the_port->state;
+        tty = state->port.tty;
+
+        if (uart_circ_empty(&state->xmit) || uart_tx_stopped(the_port)) {
+                /* Nothing to do or hw stopped */
+                set_notification(port, N_ALL_OUTPUT, 0);
+                return;
+        }
+
+        head = state->xmit.head;
+        tail = state->xmit.tail;
+        start = (char *)&state->xmit.buf[tail];
+
+        /* write out all the data or until the end of the buffer */
+        xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail);
+        if (xmit_count > 0) {
+                result = do_write(port, start, xmit_count);
+                if (result > 0) {
+                        /* booking */
+                        xmit_count -= result;
+                        the_port->icount.tx += result;
+                        /* advance the pointers */
+                        tail += result;
+                        tail &= UART_XMIT_SIZE - 1;
+                        state->xmit.tail = tail;
+                        start = (char *)&state->xmit.buf[tail];
+                }
+        }
+        if (uart_circ_chars_pending(&state->xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(the_port);
+
+        if (uart_circ_empty(&state->xmit)) {
+                set_notification(port, N_OUTPUT_LOWAT, 0);
+        } else {
+                set_notification(port, N_OUTPUT_LOWAT, 1);
+        }
+}
+
+/**
+ * ioc4_change_speed - change the speed of the port
+ * @the_port: port to change
+ * @new_termios: new termios settings
+ * @old_termios: old termios settings
+ */
+static void
+ioc4_change_speed(struct uart_port *the_port,
+                  struct ktermios *new_termios, struct ktermios *old_termios)
+{
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+        int baud, bits;
+        unsigned cflag, iflag;
+        int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
+        struct uart_state *state = the_port->state;
+
+        cflag = new_termios->c_cflag;
+        iflag = new_termios->c_iflag;
+
+        switch (cflag & CSIZE) {
+        case CS5:
+                new_data = 5;
+                bits = 7;
+                break;
+        case CS6:
+                new_data = 6;
+                bits = 8;
+                break;
+        case CS7:
+                new_data = 7;
+                bits = 9;
+                break;
+        case CS8:
+                new_data = 8;
+                bits = 10;
+                break;
+        default:
+                /* cuz we always need a default ... */
+                new_data = 5;
+                bits = 7;
+                break;
+        }
+        if (cflag & CSTOPB) {
+                bits++;
+                new_stop = 1;
+        }
+        if (cflag & PARENB) {
+                bits++;
+                new_parity_enable = 1;
+                if (cflag & PARODD)
+                        new_parity = 1;
+        }
+        baud = uart_get_baud_rate(the_port, new_termios, old_termios,
+                                MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED);
+        DPRINT_CONFIG(("%s: returned baud %d\n", __func__, baud));
+
+        /* default is 9600 */
+        if (!baud)
+                baud = 9600;
+
+        if (!the_port->fifosize)
+                the_port->fifosize = IOC4_FIFO_CHARS;
+        the_port->timeout = ((the_port->fifosize * HZ * bits) / (baud / 10));
+        the_port->timeout += HZ / 50;   /* Add .02 seconds of slop */
+
+        the_port->ignore_status_mask = N_ALL_INPUT;
+
+        state->port.tty->low_latency = 1;
+
+        if (iflag & IGNPAR)
+                the_port->ignore_status_mask &= ~(N_PARITY_ERROR
+                                                | N_FRAMING_ERROR);
+        if (iflag & IGNBRK) {
+                the_port->ignore_status_mask &= ~N_BREAK;
+                if (iflag & IGNPAR)
+                        the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
+        }
+        if (!(cflag & CREAD)) {
+                /* ignore everything */
+                the_port->ignore_status_mask &= ~N_DATA_READY;
+        }
+
+        if (cflag & CRTSCTS) {
+                port->ip_sscr |= IOC4_SSCR_HFC_EN;
+        }
+        else {
+                port->ip_sscr &= ~IOC4_SSCR_HFC_EN;
+        }
+        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+
+        /* Set the configuration and proper notification call */
+        DPRINT_CONFIG(("%s : port 0x%p cflag 0%o "
+                "config_port(baud %d data %d stop %d p enable %d parity %d),"
+                " notification 0x%x\n",
+             __func__, (void *)port, cflag, baud, new_data, new_stop,
+             new_parity_enable, new_parity, the_port->ignore_status_mask));
+
+        if ((config_port(port, baud,            /* baud */
+                         new_data,              /* byte size */
+                         new_stop,              /* stop bits */
+                         new_parity_enable,     /* set parity */
+                         new_parity)) >= 0) {   /* parity 1==odd */
+                set_notification(port, the_port->ignore_status_mask, 1);
+        }
+}
+
+/**
+ * ic4_startup_local - Start up the serial port - returns >= 0 if no errors
+ * @the_port: Port to operate on
+ */
+static inline int ic4_startup_local(struct uart_port *the_port)
+{
+        struct ioc4_port *port;
+        struct uart_state *state;
+
+        if (!the_port)
+                return -1;
+
+        port = get_ioc4_port(the_port, 0);
+        if (!port)
+                return -1;
+
+        state = the_port->state;
+
+        local_open(port);
+
+        /* set the protocol - mapbase has the port type */
+        ioc4_set_proto(port, the_port->mapbase);
+
+        /* set the speed of the serial port */
+        ioc4_change_speed(the_port, state->port.tty->termios,
+                          (struct ktermios *)0);
+
+        return 0;
+}
+
+/*
+ * ioc4_cb_output_lowat - called when the output low water mark is hit
+ * @the_port: port to output
+ */
+static void ioc4_cb_output_lowat(struct uart_port *the_port)
+{
+        unsigned long pflags;
+
+        /* ip_lock is set on the call here */
+        if (the_port) {
+                spin_lock_irqsave(&the_port->lock, pflags);
+                transmit_chars(the_port);
+                spin_unlock_irqrestore(&the_port->lock, pflags);
+        }
+}
+
+/**
+ * handle_intr - service any interrupts for the given port - 2nd level
+ *                      called via sd_intr
+ * @arg: handler arg
+ * @sio_ir: ioc4regs
+ */
+static void handle_intr(void *arg, uint32_t sio_ir)
+{
+        struct ioc4_port *port = (struct ioc4_port *)arg;
+        struct hooks *hooks = port->ip_hooks;
+        unsigned int rx_high_rd_aborted = 0;
+        unsigned long flags;
+        struct uart_port *the_port;
+        int loop_counter;
+
+        /* Possible race condition here: The tx_mt interrupt bit may be
+         * cleared without the intervention of the interrupt handler,
+         * e.g. by a write.  If the top level interrupt handler reads a
+         * tx_mt, then some other processor does a write, starting up
+         * output, then we come in here, see the tx_mt and stop DMA, the
+         * output started by the other processor will hang.  Thus we can
+         * only rely on tx_mt being legitimate if it is read while the
+         * port lock is held.  Therefore this bit must be ignored in the
+         * passed in interrupt mask which was read by the top level
+         * interrupt handler since the port lock was not held at the time
+         * it was read.  We can only rely on this bit being accurate if it
+         * is read while the port lock is held.  So we'll clear it for now,
+         * and reload it later once we have the port lock.
+         */
+        sio_ir &= ~(hooks->intr_tx_mt);
+
+        spin_lock_irqsave(&port->ip_lock, flags);
+
+        loop_counter = MAXITER; /* to avoid hangs */
+
+        do {
+                uint32_t shadow;
+
+                if ( loop_counter-- <= 0 ) {
+                        printk(KERN_WARNING "IOC4 serial: "
+                                        "possible hang condition/"
+                                        "port stuck on interrupt.\n");
+                        break;
+                }
+
+                /* Handle a DCD change */
+                if (sio_ir & hooks->intr_delta_dcd) {
+                        /* ACK the interrupt */
+                        writel(hooks->intr_delta_dcd,
+                                &port->ip_mem->sio_ir.raw);
+
+                        shadow = readl(&port->ip_serial_regs->shadow);
+
+                        if ((port->ip_notify & N_DDCD)
+                                        && (shadow & IOC4_SHADOW_DCD)
+                                        && (port->ip_port)) {
+                                the_port = port->ip_port;
+                                the_port->icount.dcd = 1;
+                                wake_up_interruptible
+                                            (&the_port->state->port.delta_msr_wait);
+                        } else if ((port->ip_notify & N_DDCD)
+                                        && !(shadow & IOC4_SHADOW_DCD)) {
+                                /* Flag delta DCD/no DCD */
+                                port->ip_flags |= DCD_ON;
+                        }
+                }
+
+                /* Handle a CTS change */
+                if (sio_ir & hooks->intr_delta_cts) {
+                        /* ACK the interrupt */
+                        writel(hooks->intr_delta_cts,
+                                        &port->ip_mem->sio_ir.raw);
+
+                        shadow = readl(&port->ip_serial_regs->shadow);
+
+                        if ((port->ip_notify & N_DCTS)
+                                        && (port->ip_port)) {
+                                the_port = port->ip_port;
+                                the_port->icount.cts =
+                                        (shadow & IOC4_SHADOW_CTS) ? 1 : 0;
+                                wake_up_interruptible
+                                        (&the_port->state->port.delta_msr_wait);
+                        }
+                }
+
+                /* rx timeout interrupt.  Must be some data available.  Put this
+                 * before the check for rx_high since servicing this condition
+                 * may cause that condition to clear.
+                 */
+                if (sio_ir & hooks->intr_rx_timer) {
+                        /* ACK the interrupt */
+                        writel(hooks->intr_rx_timer,
+                                &port->ip_mem->sio_ir.raw);
+
+                        if ((port->ip_notify & N_DATA_READY)
+                                        && (port->ip_port)) {
+                                /* ip_lock is set on call here */
+                                receive_chars(port->ip_port);
+                        }
+                }
+
+                /* rx high interrupt. Must be after rx_timer.  */
+                else if (sio_ir & hooks->intr_rx_high) {
+                        /* Data available, notify upper layer */
+                        if ((port->ip_notify & N_DATA_READY)
+                                                && port->ip_port) {
+                                /* ip_lock is set on call here */
+                                receive_chars(port->ip_port);
+                        }
+
+                        /* We can't ACK this interrupt.  If receive_chars didn't
+                         * cause the condition to clear, we'll have to disable
+                         * the interrupt until the data is drained.
+                         * If the read was aborted, don't disable the interrupt
+                         * as this may cause us to hang indefinitely.  An
+                         * aborted read generally means that this interrupt
+                         * hasn't been delivered to the cpu yet anyway, even
+                         * though we see it as asserted when we read the sio_ir.
+                         */
+                        if ((sio_ir = PENDING(port)) & hooks->intr_rx_high) {
+                                if ((port->ip_flags & READ_ABORTED) == 0) {
+                                        port->ip_ienb &= ~hooks->intr_rx_high;
+                                        port->ip_flags |= INPUT_HIGH;
+                                } else {
+                                        rx_high_rd_aborted++;
+                                }
+                        }
+                }
+
+                /* We got a low water interrupt: notify upper layer to
+                 * send more data.  Must come before tx_mt since servicing
+                 * this condition may cause that condition to clear.
+                 */
+                if (sio_ir & hooks->intr_tx_explicit) {
+                        port->ip_flags &= ~LOWAT_WRITTEN;
+
+                        /* ACK the interrupt */
+                        writel(hooks->intr_tx_explicit,
+                                        &port->ip_mem->sio_ir.raw);
+
+                        if (port->ip_notify & N_OUTPUT_LOWAT)
+                                ioc4_cb_output_lowat(port->ip_port);
+                }
+
+                /* Handle tx_mt.  Must come after tx_explicit.  */
+                else if (sio_ir & hooks->intr_tx_mt) {
+                        /* If we are expecting a lowat notification
+                         * and we get to this point it probably means that for
+                         * some reason the tx_explicit didn't work as expected
+                         * (that can legitimately happen if the output buffer is
+                         * filled up in just the right way).
+                         * So send the notification now.
+                         */
+                        if (port->ip_notify & N_OUTPUT_LOWAT) {
+                                ioc4_cb_output_lowat(port->ip_port);
+
+                                /* We need to reload the sio_ir since the lowat
+                                 * call may have caused another write to occur,
+                                 * clearing the tx_mt condition.
+                                 */
+                                sio_ir = PENDING(port);
+                        }
+
+                        /* If the tx_mt condition still persists even after the
+                         * lowat call, we've got some work to do.
+                         */
+                        if (sio_ir & hooks->intr_tx_mt) {
+
+                                /* If we are not currently expecting DMA input,
+                                 * and the transmitter has just gone idle,
+                                 * there is no longer any reason for DMA, so
+                                 * disable it.
+                                 */
+                                if (!(port->ip_notify
+                                                & (N_DATA_READY | N_DDCD))) {
+                                        BUG_ON(!(port->ip_sscr
+                                                        & IOC4_SSCR_DMA_EN));
+                                        port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
+                                        writel(port->ip_sscr,
+                                           &port->ip_serial_regs->sscr);
+                                }
+
+                                /* Prevent infinite tx_mt interrupt */
+                                port->ip_ienb &= ~hooks->intr_tx_mt;
+                        }
+                }
+                sio_ir = PENDING(port);
+
+                /* if the read was aborted and only hooks->intr_rx_high,
+                 * clear hooks->intr_rx_high, so we do not loop forever.
+                 */
+
+                if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) {
+                        sio_ir &= ~hooks->intr_rx_high;
+                }
+        } while (sio_ir & hooks->intr_all);
+
+        spin_unlock_irqrestore(&port->ip_lock, flags);
+
+        /* Re-enable interrupts before returning from interrupt handler.
+         * Getting interrupted here is okay.  It'll just v() our semaphore, and
+         * we'll come through the loop again.
+         */
+
+        write_ireg(port->ip_ioc4_soft, port->ip_ienb, IOC4_W_IES,
+                                                        IOC4_SIO_INTR_TYPE);
+}
+
+/*
+ * ioc4_cb_post_ncs - called for some basic errors
+ * @port: port to use
+ * @ncs: event
+ */
+static void ioc4_cb_post_ncs(struct uart_port *the_port, int ncs)
+{
+        struct uart_icount *icount;
+
+        icount = &the_port->icount;
+
+        if (ncs & NCS_BREAK)
+                icount->brk++;
+        if (ncs & NCS_FRAMING)
+                icount->frame++;
+        if (ncs & NCS_OVERRUN)
+                icount->overrun++;
+        if (ncs & NCS_PARITY)
+                icount->parity++;
+}
+
+/**
+ * do_read - Read in bytes from the port.  Return the number of bytes
+ *                      actually read.
+ * @the_port: port to use
+ * @buf: place to put the stuff we read
+ * @len: how big 'buf' is
+ */
+
+static inline int do_read(struct uart_port *the_port, unsigned char *buf,
+                                int len)
+{
+        int prod_ptr, cons_ptr, total;
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+        struct ring *inring;
+        struct ring_entry *entry;
+        struct hooks *hooks = port->ip_hooks;
+        int byte_num;
+        char *sc;
+        int loop_counter;
+
+        BUG_ON(!(len >= 0));
+        BUG_ON(!port);
+
+        /* There is a nasty timing issue in the IOC4. When the rx_timer
+         * expires or the rx_high condition arises, we take an interrupt.
+         * At some point while servicing the interrupt, we read bytes from
+         * the ring buffer and re-arm the rx_timer.  However the rx_timer is
+         * not started until the first byte is received *after* it is armed,
+         * and any bytes pending in the rx construction buffers are not drained
+         * to memory until either there are 4 bytes available or the rx_timer
+         * expires.  This leads to a potential situation where data is left
+         * in the construction buffers forever - 1 to 3 bytes were received
+         * after the interrupt was generated but before the rx_timer was
+         * re-armed. At that point as long as no subsequent bytes are received
+         * the timer will never be started and the bytes will remain in the
+         * construction buffer forever.  The solution is to execute a DRAIN
+         * command after rearming the timer.  This way any bytes received before
+         * the DRAIN will be drained to memory, and any bytes received after
+         * the DRAIN will start the TIMER and be drained when it expires.
+         * Luckily, this only needs to be done when the DMA buffer is empty
+         * since there is no requirement that this function return all
+         * available data as long as it returns some.
+         */
+        /* Re-arm the timer */
+        writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir);
+
+        prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
+        cons_ptr = port->ip_rx_cons;
+
+        if (prod_ptr == cons_ptr) {
+                int reset_dma = 0;
+
+                /* Input buffer appears empty, do a flush. */
+
+                /* DMA must be enabled for this to work. */
+                if (!(port->ip_sscr & IOC4_SSCR_DMA_EN)) {
+                        port->ip_sscr |= IOC4_SSCR_DMA_EN;
+                        reset_dma = 1;
+                }
+
+                /* Potential race condition: we must reload the srpir after
+                 * issuing the drain command, otherwise we could think the rx
+                 * buffer is empty, then take a very long interrupt, and when
+                 * we come back it's full and we wait forever for the drain to
+                 * complete.
+                 */
+                writel(port->ip_sscr | IOC4_SSCR_RX_DRAIN,
+                                &port->ip_serial_regs->sscr);
+                prod_ptr = readl(&port->ip_serial_regs->srpir)
+                                & PROD_CONS_MASK;
+
+                /* We must not wait for the DRAIN to complete unless there are
+                 * at least 8 bytes (2 ring entries) available to receive the
+                 * data otherwise the DRAIN will never complete and we'll
+                 * deadlock here.
+                 * In fact, to make things easier, I'll just ignore the flush if
+                 * there is any data at all now available.
+                 */
+                if (prod_ptr == cons_ptr) {
+                        loop_counter = 0;
+                        while (readl(&port->ip_serial_regs->sscr) &
+                                                IOC4_SSCR_RX_DRAIN) {
+                                loop_counter++;
+                                if (loop_counter > MAXITER)
+                                        return -1;
+                        }
+
+                        /* SIGH. We have to reload the prod_ptr *again* since
+                         * the drain may have caused it to change
+                         */
+                        prod_ptr = readl(&port->ip_serial_regs->srpir)
+                                                        & PROD_CONS_MASK;
+                }
+                if (reset_dma) {
+                        port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
+                        writel(port->ip_sscr, &port->ip_serial_regs->sscr);
+                }
+        }
+        inring = port->ip_inring;
+        port->ip_flags &= ~READ_ABORTED;
+
+        total = 0;
+        loop_counter = 0xfffff; /* to avoid hangs */
+
+        /* Grab bytes from the hardware */
+        while ((prod_ptr != cons_ptr) && (len > 0)) {
+                entry = (struct ring_entry *)((caddr_t)inring + cons_ptr);
+
+                if ( loop_counter-- <= 0 ) {
+                        printk(KERN_WARNING "IOC4 serial: "
+                                        "possible hang condition/"
+                                        "port stuck on read.\n");
+                        break;
+                }
+
+                /* According to the producer pointer, this ring entry
+                 * must contain some data.  But if the PIO happened faster
+                 * than the DMA, the data may not be available yet, so let's
+                 * wait until it arrives.
+                 */
+                if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
+                        /* Indicate the read is aborted so we don't disable
+                         * the interrupt thinking that the consumer is
+                         * congested.
+                         */
+                        port->ip_flags |= READ_ABORTED;
+                        len = 0;
+                        break;
+                }
+
+                /* Load the bytes/status out of the ring entry */
+                for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) {
+                        sc = &(entry->ring_sc[byte_num]);
+
+                        /* Check for change in modem state or overrun */
+                        if ((*sc & IOC4_RXSB_MODEM_VALID)
+                                                && (port->ip_notify & N_DDCD)) {
+                                /* Notify upper layer if DCD dropped */
+
+                                if ((port->ip_flags & DCD_ON)
+                                                && !(*sc & IOC4_RXSB_DCD)) {
+
+                                        /* If we have already copied some data,
+                                         * return it.  We'll pick up the carrier
+                                         * drop on the next pass.  That way we
+                                         * don't throw away the data that has
+                                         * already been copied back to
+                                         * the caller's buffer.
+                                         */
+                                        if (total > 0) {
+                                                len = 0;
+                                                break;
+                                        }
+                                        port->ip_flags &= ~DCD_ON;
+
+                                        /* Turn off this notification so the
+                                         * carrier drop protocol won't see it
+                                         * again when it does a read.
+                                         */
+                                        *sc &= ~IOC4_RXSB_MODEM_VALID;
+
+                                        /* To keep things consistent, we need
+                                         * to update the consumer pointer so
+                                         * the next reader won't come in and
+                                         * try to read the same ring entries
+                                         * again. This must be done here before
+                                         * the dcd change.
+                                         */
+
+                                        if ((entry->ring_allsc & RING_ANY_VALID)
+                                                                        == 0) {
+                                                cons_ptr += (int)sizeof
+                                                        (struct ring_entry);
+                                                cons_ptr &= PROD_CONS_MASK;
+                                        }
+                                        writel(cons_ptr,
+                                                &port->ip_serial_regs->srcir);
+                                        port->ip_rx_cons = cons_ptr;
+
+                                        /* Notify upper layer of carrier drop */
+                                        if ((port->ip_notify & N_DDCD)
+                                                   && port->ip_port) {
+                                                the_port->icount.dcd = 0;
+                                                wake_up_interruptible
+                                                    (&the_port->state->
+                                                        port.delta_msr_wait);
+                                        }
+
+                                        /* If we had any data to return, we
+                                         * would have returned it above.
+                                         */
+                                        return 0;
+                                }
+                        }
+                        if (*sc & IOC4_RXSB_MODEM_VALID) {
+                                /* Notify that an input overrun occurred */
+                                if ((*sc & IOC4_RXSB_OVERRUN)
+                                    && (port->ip_notify & N_OVERRUN_ERROR)) {
+                                        ioc4_cb_post_ncs(the_port, NCS_OVERRUN);
+                                }
+                                /* Don't look at this byte again */
+                                *sc &= ~IOC4_RXSB_MODEM_VALID;
+                        }
+
+                        /* Check for valid data or RX errors */
+                        if ((*sc & IOC4_RXSB_DATA_VALID) &&
+                                        ((*sc & (IOC4_RXSB_PAR_ERR
+                                                        | IOC4_RXSB_FRAME_ERR
+                                                        | IOC4_RXSB_BREAK))
+                                        && (port->ip_notify & (N_PARITY_ERROR
+                                                        | N_FRAMING_ERROR
+                                                        | N_BREAK)))) {
+                                /* There is an error condition on the next byte.
+                                 * If we have already transferred some bytes,
+                                 * we'll stop here. Otherwise if this is the
+                                 * first byte to be read, we'll just transfer
+                                 * it alone after notifying the
+                                 * upper layer of its status.
+                                 */
+                                if (total > 0) {
+                                        len = 0;
+                                        break;
+                                } else {
+                                        if ((*sc & IOC4_RXSB_PAR_ERR) &&
+                                           (port->ip_notify & N_PARITY_ERROR)) {
+                                                ioc4_cb_post_ncs(the_port,
+                                                                NCS_PARITY);
+                                        }
+                                        if ((*sc & IOC4_RXSB_FRAME_ERR) &&
+                                           (port->ip_notify & N_FRAMING_ERROR)){
+                                                ioc4_cb_post_ncs(the_port,
+                                                                NCS_FRAMING);
+                                        }
+                                        if ((*sc & IOC4_RXSB_BREAK)
+                                            && (port->ip_notify & N_BREAK)) {
+                                                        ioc4_cb_post_ncs
+                                                                    (the_port,
+                                                                     NCS_BREAK);
+                                        }
+                                        len = 1;
+                                }
+                        }
+                        if (*sc & IOC4_RXSB_DATA_VALID) {
+                                *sc &= ~IOC4_RXSB_DATA_VALID;
+                                *buf = entry->ring_data[byte_num];
+                                buf++;
+                                len--;
+                                total++;
+                        }
+                }
+
+                /* If we used up this entry entirely, go on to the next one,
+                 * otherwise we must have run out of buffer space, so
+                 * leave the consumer pointer here for the next read in case
+                 * there are still unread bytes in this entry.
+                 */
+                if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
+                        cons_ptr += (int)sizeof(struct ring_entry);
+                        cons_ptr &= PROD_CONS_MASK;
+                }
+        }
+
+        /* Update consumer pointer and re-arm rx timer interrupt */
+        writel(cons_ptr, &port->ip_serial_regs->srcir);
+        port->ip_rx_cons = cons_ptr;
+
+        /* If we have now dipped below the rx high water mark and we have
+         * rx_high interrupt turned off, we can now turn it back on again.
+         */
+        if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr)
+                        & PROD_CONS_MASK) < ((port->ip_sscr &
+                                IOC4_SSCR_RX_THRESHOLD)
+                                        << IOC4_PROD_CONS_PTR_OFF))) {
+                port->ip_flags &= ~INPUT_HIGH;
+                enable_intrs(port, hooks->intr_rx_high);
+        }
+        return total;
+}
+
+/**
+ * receive_chars - upper level read. Called with ip_lock.
+ * @the_port: port to read from
+ */
+static void receive_chars(struct uart_port *the_port)
+{
+        struct tty_struct *tty;
+        unsigned char ch[IOC4_MAX_CHARS];
+        int read_count, request_count = IOC4_MAX_CHARS;
+        struct uart_icount *icount;
+        struct uart_state *state = the_port->state;
+        unsigned long pflags;
+
+        /* Make sure all the pointers are "good" ones */
+        if (!state)
+                return;
+        if (!state->port.tty)
+                return;
+
+        spin_lock_irqsave(&the_port->lock, pflags);
+        tty = state->port.tty;
+
+        request_count = tty_buffer_request_room(tty, IOC4_MAX_CHARS);
+
+        if (request_count > 0) {
+                icount = &the_port->icount;
+                read_count = do_read(the_port, ch, request_count);
+                if (read_count > 0) {
+                        tty_insert_flip_string(tty, ch, read_count);
+                        icount->rx += read_count;
+                }
+        }
+
+        spin_unlock_irqrestore(&the_port->lock, pflags);
+
+        tty_flip_buffer_push(tty);
+}
+
+/**
+ * ic4_type - What type of console are we?
+ * @port: Port to operate with (we ignore since we only have one port)
+ *
+ */
+static const char *ic4_type(struct uart_port *the_port)
+{
+        if (the_port->mapbase == PROTO_RS232)
+                return "SGI IOC4 Serial [rs232]";
+        else
+                return "SGI IOC4 Serial [rs422]";
+}
+
+/**
+ * ic4_tx_empty - Is the transmitter empty?
+ * @port: Port to operate on
+ *
+ */
+static unsigned int ic4_tx_empty(struct uart_port *the_port)
+{
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+        unsigned int ret = 0;
+
+        if (port_is_active(port, the_port)) {
+                if (readl(&port->ip_serial_regs->shadow) & IOC4_SHADOW_TEMT)
+                        ret = TIOCSER_TEMT;
+        }
+        return ret;
+}
+
+/**
+ * ic4_stop_tx - stop the transmitter
+ * @port: Port to operate on
+ *
+ */
+static void ic4_stop_tx(struct uart_port *the_port)
+{
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+
+        if (port_is_active(port, the_port))
+                set_notification(port, N_OUTPUT_LOWAT, 0);
+}
+
+/**
+ * null_void_function -
+ * @port: Port to operate on
+ *
+ */
+static void null_void_function(struct uart_port *the_port)
+{
+}
+
+/**
+ * ic4_shutdown - shut down the port - free irq and disable
+ * @port: Port to shut down
+ *
+ */
+static void ic4_shutdown(struct uart_port *the_port)
+{
+        unsigned long port_flags;
+        struct ioc4_port *port;
+        struct uart_state *state;
+
+        port = get_ioc4_port(the_port, 0);
+        if (!port)
+                return;
+
+        state = the_port->state;
+        port->ip_port = NULL;
+
+        wake_up_interruptible(&state->port.delta_msr_wait);
+
+        if (state->port.tty)
+                set_bit(TTY_IO_ERROR, &state->port.tty->flags);
+
+        spin_lock_irqsave(&the_port->lock, port_flags);
+        set_notification(port, N_ALL, 0);
+        port->ip_flags = PORT_INACTIVE;
+        spin_unlock_irqrestore(&the_port->lock, port_flags);
+}
+
+/**
+ * ic4_set_mctrl - set control lines (dtr, rts, etc)
+ * @port: Port to operate on
+ * @mctrl: Lines to set/unset
+ *
+ */
+static void ic4_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
+{
+        unsigned char mcr = 0;
+        struct ioc4_port *port;
+
+        port = get_ioc4_port(the_port, 0);
+        if (!port_is_active(port, the_port))
+                return;
+
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        set_mcr(the_port, mcr, IOC4_SHADOW_DTR);
+}
+
+/**
+ * ic4_get_mctrl - get control line info
+ * @port: port to operate on
+ *
+ */
+static unsigned int ic4_get_mctrl(struct uart_port *the_port)
+{
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+        uint32_t shadow;
+        unsigned int ret = 0;
+
+        if (!port_is_active(port, the_port))
+                return 0;
+
+        shadow = readl(&port->ip_serial_regs->shadow);
+        if (shadow & IOC4_SHADOW_DCD)
+                ret |= TIOCM_CAR;
+        if (shadow & IOC4_SHADOW_DR)
+                ret |= TIOCM_DSR;
+        if (shadow & IOC4_SHADOW_CTS)
+                ret |= TIOCM_CTS;
+        return ret;
+}
+
+/**
+ * ic4_start_tx - Start transmitter, flush any output
+ * @port: Port to operate on
+ *
+ */
+static void ic4_start_tx(struct uart_port *the_port)
+{
+        struct ioc4_port *port = get_ioc4_port(the_port, 0);
+
+        if (port_is_active(port, the_port)) {
+                set_notification(port, N_OUTPUT_LOWAT, 1);
+                enable_intrs(port, port->ip_hooks->intr_tx_mt);
+        }
+}
+
+/**
+ * ic4_break_ctl - handle breaks
+ * @port: Port to operate on
+ * @break_state: Break state
+ *
+ */
+static void ic4_break_ctl(struct uart_port *the_port, int break_state)
+{
+}
+
+/**
+ * ic4_startup - Start up the serial port
+ * @port: Port to operate on
+ *
+ */
+static int ic4_startup(struct uart_port *the_port)
+{
+        int retval;
+        struct ioc4_port *port;
+        struct ioc4_control *control;
+        struct uart_state *state;
+        unsigned long port_flags;
+
+        if (!the_port)
+                return -ENODEV;
+        port = get_ioc4_port(the_port, 1);
+        if (!port)
+                return -ENODEV;
+        state = the_port->state;
+
+        control = port->ip_control;
+        if (!control) {
+                port->ip_port = NULL;
+                return -ENODEV;
+        }
+
+        /* Start up the serial port */
+        spin_lock_irqsave(&the_port->lock, port_flags);
+        retval = ic4_startup_local(the_port);
+        spin_unlock_irqrestore(&the_port->lock, port_flags);
+        return retval;
+}
+
+/**
+ * ic4_set_termios - set termios stuff
+ * @port: port to operate on
+ * @termios: New settings
+ * @termios: Old
+ *
+ */
+static void
+ic4_set_termios(struct uart_port *the_port,
+                struct ktermios *termios, struct ktermios *old_termios)
+{
+        unsigned long port_flags;
+
+        spin_lock_irqsave(&the_port->lock, port_flags);
+        ioc4_change_speed(the_port, termios, old_termios);
+        spin_unlock_irqrestore(&the_port->lock, port_flags);
+}
+
+/**
+ * ic4_request_port - allocate resources for port - no op....
+ * @port: port to operate on
+ *
+ */
+static int ic4_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/* Associate the uart functions above - given to serial core */
+
+static struct uart_ops ioc4_ops = {
+        .tx_empty       = ic4_tx_empty,
+        .set_mctrl      = ic4_set_mctrl,
+        .get_mctrl      = ic4_get_mctrl,
+        .stop_tx        = ic4_stop_tx,
+        .start_tx       = ic4_start_tx,
+        .stop_rx        = null_void_function,
+        .enable_ms      = null_void_function,
+        .break_ctl      = ic4_break_ctl,
+        .startup        = ic4_startup,
+        .shutdown       = ic4_shutdown,
+        .set_termios    = ic4_set_termios,
+        .type           = ic4_type,
+        .release_port   = null_void_function,
+        .request_port   = ic4_request_port,
+};
+
+/*
+ * Boot-time initialization code
+ */
+
+static struct uart_driver ioc4_uart_rs232 = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "ioc4_serial_rs232",
+        .dev_name       = DEVICE_NAME_RS232,
+        .major          = DEVICE_MAJOR,
+        .minor          = DEVICE_MINOR_RS232,
+        .nr             = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
+};
+
+static struct uart_driver ioc4_uart_rs422 = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "ioc4_serial_rs422",
+        .dev_name       = DEVICE_NAME_RS422,
+        .major          = DEVICE_MAJOR,
+        .minor          = DEVICE_MINOR_RS422,
+        .nr             = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
+};
+
+
+/**
+ * ioc4_serial_remove_one - detach function
+ *
+ * @idd: IOC4 master module data for this IOC4
+ */
+
+static int ioc4_serial_remove_one(struct ioc4_driver_data *idd)
+{
+        int port_num, port_type;
+        struct ioc4_control *control;
+        struct uart_port *the_port;
+        struct ioc4_port *port;
+        struct ioc4_soft *soft;
+
+        /* If serial driver did not attach, don't try to detach */
+        control = idd->idd_serial_data;
+        if (!control)
+                return 0;
+
+        for (port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++) {
+                for (port_type = UART_PORT_MIN;
+                                        port_type < UART_PORT_COUNT;
+                                        port_type++) {
+                        the_port = &control->ic_port[port_num].icp_uart_port
+                                                        [port_type];
+                        if (the_port) {
+                                switch (port_type) {
+                                case UART_PORT_RS422:
+                                        uart_remove_one_port(&ioc4_uart_rs422,
+                                                        the_port);
+                                        break;
+                                default:
+                                case UART_PORT_RS232:
+                                        uart_remove_one_port(&ioc4_uart_rs232,
+                                                        the_port);
+                                        break;
+                                }
+                        }
+                }
+                port = control->ic_port[port_num].icp_port;
+                /* we allocate in pairs */
+                if (!(port_num & 1) && port) {
+                        pci_free_consistent(port->ip_pdev,
+                                        TOTAL_RING_BUF_SIZE,
+                                        port->ip_cpu_ringbuf,
+                                        port->ip_dma_ringbuf);
+                        kfree(port);
+                }
+        }
+        soft = control->ic_soft;
+        if (soft) {
+                free_irq(control->ic_irq, soft);
+                if (soft->is_ioc4_serial_addr) {
+                        iounmap(soft->is_ioc4_serial_addr);
+                        release_mem_region((unsigned long)
+                             soft->is_ioc4_serial_addr,
+                                sizeof(struct ioc4_serial));
+                }
+                kfree(soft);
+        }
+        kfree(control);
+        idd->idd_serial_data = NULL;
+
+        return 0;
+}
+
+
+/**
+ * ioc4_serial_core_attach_rs232 - register with serial core
+ *              This is done during pci probing
+ * @pdev: handle for this card
+ */
+static inline int
+ioc4_serial_core_attach(struct pci_dev *pdev, int port_type)
+{
+        struct ioc4_port *port;
+        struct uart_port *the_port;
+        struct ioc4_driver_data *idd = pci_get_drvdata(pdev);
+        struct ioc4_control *control = idd->idd_serial_data;
+        int port_num;
+        int port_type_idx;
+        struct uart_driver *u_driver;
+
+
+        DPRINT_CONFIG(("%s: attach pdev 0x%p - control 0x%p\n",
+                        __func__, pdev, (void *)control));
+
+        if (!control)
+                return -ENODEV;
+
+        port_type_idx = (port_type == PROTO_RS232) ? UART_PORT_RS232
+                                                : UART_PORT_RS422;
+
+        u_driver = (port_type == PROTO_RS232)   ? &ioc4_uart_rs232
+                                                : &ioc4_uart_rs422;
+
+        /* once around for each port on this card */
+        for (port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++) {
+                the_port = &control->ic_port[port_num].icp_uart_port
+                                                        [port_type_idx];
+                port = control->ic_port[port_num].icp_port;
+                port->ip_all_ports[port_type_idx] = the_port;
+
+                DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p : type %s\n",
+                                __func__, (void *)the_port,
+                                (void *)port,
+                                port_type == PROTO_RS232 ? "rs232" : "rs422"));
+
+                /* membase, iobase and mapbase just need to be non-0 */
+                the_port->membase = (unsigned char __iomem *)1;
+                the_port->iobase = (pdev->bus->number << 16) |  port_num;
+                the_port->line = (Num_of_ioc4_cards << 2) | port_num;
+                the_port->mapbase = port_type;
+                the_port->type = PORT_16550A;
+                the_port->fifosize = IOC4_FIFO_CHARS;
+                the_port->ops = &ioc4_ops;
+                the_port->irq = control->ic_irq;
+                the_port->dev = &pdev->dev;
+                spin_lock_init(&the_port->lock);
+                if (uart_add_one_port(u_driver, the_port) < 0) {
+                        printk(KERN_WARNING
+                           "%s: unable to add port %d bus %d\n",
+                               __func__, the_port->line, pdev->bus->number);
+                } else {
+                        DPRINT_CONFIG(
+                            ("IOC4 serial port %d irq = %d, bus %d\n",
+                               the_port->line, the_port->irq, pdev->bus->number));
+                }
+        }
+        return 0;
+}
+
+/**
+ * ioc4_serial_attach_one - register attach function
+ *              called per card found from IOC4 master module.
+ * @idd: Master module data for this IOC4
+ */
+int
+ioc4_serial_attach_one(struct ioc4_driver_data *idd)
+{
+        unsigned long tmp_addr1;
+        struct ioc4_serial __iomem *serial;
+        struct ioc4_soft *soft;
+        struct ioc4_control *control;
+        int ret = 0;
+
+
+        DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __func__, idd->idd_pdev,
+                                                        idd->idd_pci_id));
+
+        /* PCI-RT does not bring out serial connections.
+         * Do not attach to this particular IOC4.
+         */
+        if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
+                return 0;
+
+        /* request serial registers */
+        tmp_addr1 = idd->idd_bar0 + IOC4_SERIAL_OFFSET;
+
+        if (!request_mem_region(tmp_addr1, sizeof(struct ioc4_serial),
+                                        "sioc4_uart")) {
+                printk(KERN_WARNING
+                        "ioc4 (%p): unable to get request region for "
+                                "uart space\n", (void *)idd->idd_pdev);
+                ret = -ENODEV;
+                goto out1;
+        }
+        serial = ioremap(tmp_addr1, sizeof(struct ioc4_serial));
+        if (!serial) {
+                printk(KERN_WARNING
+                         "ioc4 (%p) : unable to remap ioc4 serial register\n",
+                                (void *)idd->idd_pdev);
+                ret = -ENODEV;
+                goto out2;
+        }
+        DPRINT_CONFIG(("%s : mem 0x%p, serial 0x%p\n",
+                                __func__, (void *)idd->idd_misc_regs,
+                                (void *)serial));
+
+        /* Get memory for the new card */
+        control = kzalloc(sizeof(struct ioc4_control), GFP_KERNEL);
+
+        if (!control) {
+                printk(KERN_WARNING "ioc4_attach_one"
+                       ": unable to get memory for the IOC4\n");
+                ret = -ENOMEM;
+                goto out2;
+        }
+        idd->idd_serial_data = control;
+
+        /* Allocate the soft structure */
+        soft = kzalloc(sizeof(struct ioc4_soft), GFP_KERNEL);
+        if (!soft) {
+                printk(KERN_WARNING
+                       "ioc4 (%p): unable to get memory for the soft struct\n",
+                       (void *)idd->idd_pdev);
+                ret = -ENOMEM;
+                goto out3;
+        }
+
+        spin_lock_init(&soft->is_ir_lock);
+        soft->is_ioc4_misc_addr = idd->idd_misc_regs;
+        soft->is_ioc4_serial_addr = serial;
+
+        /* Init the IOC4 */
+        writel(0xf << IOC4_SIO_CR_CMD_PULSE_SHIFT,
+               &idd->idd_misc_regs->sio_cr.raw);
+
+        /* Enable serial port mode select generic PIO pins as outputs */
+        writel(IOC4_GPCR_UART0_MODESEL | IOC4_GPCR_UART1_MODESEL
+                | IOC4_GPCR_UART2_MODESEL | IOC4_GPCR_UART3_MODESEL,
+                &idd->idd_misc_regs->gpcr_s.raw);
+
+        /* Clear and disable all serial interrupts */
+        write_ireg(soft, ~0, IOC4_W_IEC, IOC4_SIO_INTR_TYPE);
+        writel(~0, &idd->idd_misc_regs->sio_ir.raw);
+        write_ireg(soft, IOC4_OTHER_IR_SER_MEMERR, IOC4_W_IEC,
+                   IOC4_OTHER_INTR_TYPE);
+        writel(IOC4_OTHER_IR_SER_MEMERR, &idd->idd_misc_regs->other_ir.raw);
+        control->ic_soft = soft;
+
+        /* Hook up interrupt handler */
+        if (!request_irq(idd->idd_pdev->irq, ioc4_intr, IRQF_SHARED,
+                                "sgi-ioc4serial", soft)) {
+                control->ic_irq = idd->idd_pdev->irq;
+        } else {
+                printk(KERN_WARNING
+                    "%s : request_irq fails for IRQ 0x%x\n ",
+                        __func__, idd->idd_pdev->irq);
+        }
+        ret = ioc4_attach_local(idd);
+        if (ret)
+                goto out4;
+
+        /* register port with the serial core - 1 rs232, 1 rs422 */
+
+        if ((ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS232)))
+                goto out4;
+
+        if ((ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS422)))
+                goto out5;
+
+        Num_of_ioc4_cards++;
+
+        return ret;
+
+        /* error exits that give back resources */
+out5:
+        ioc4_serial_remove_one(idd);
+out4:
+        kfree(soft);
+out3:
+        kfree(control);
+out2:
+        if (serial)
+                iounmap(serial);
+        release_mem_region(tmp_addr1, sizeof(struct ioc4_serial));
+out1:
+
+        return ret;
+}
+
+
+static struct ioc4_submodule ioc4_serial_submodule = {
+        .is_name = "IOC4_serial",
+        .is_owner = THIS_MODULE,
+        .is_probe = ioc4_serial_attach_one,
+        .is_remove = ioc4_serial_remove_one,
+};
+
+/**
+ * ioc4_serial_init - module init
+ */
+static int __init ioc4_serial_init(void)
+{
+        int ret;
+
+        /* register with serial core */
+        if ((ret = uart_register_driver(&ioc4_uart_rs232)) < 0) {
+                printk(KERN_WARNING
+                        "%s: Couldn't register rs232 IOC4 serial driver\n",
+                        __func__);
+                goto out;
+        }
+        if ((ret = uart_register_driver(&ioc4_uart_rs422)) < 0) {
+                printk(KERN_WARNING
+                        "%s: Couldn't register rs422 IOC4 serial driver\n",
+                        __func__);
+                goto out_uart_rs232;
+        }
+
+        /* register with IOC4 main module */
+        ret = ioc4_register_submodule(&ioc4_serial_submodule);
+        if (ret)
+                goto out_uart_rs422;
+        return 0;
+
+out_uart_rs422:
+        uart_unregister_driver(&ioc4_uart_rs422);
+out_uart_rs232:
+        uart_unregister_driver(&ioc4_uart_rs232);
+out:
+        return ret;
+}
+
+static void __exit ioc4_serial_exit(void)
+{
+        ioc4_unregister_submodule(&ioc4_serial_submodule);
+        uart_unregister_driver(&ioc4_uart_rs232);
+        uart_unregister_driver(&ioc4_uart_rs422);
+}
+
+late_initcall(ioc4_serial_init); /* Call only after tty init is done */
+module_exit(ioc4_serial_exit);
+
+MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");
+MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC4 Base-IO Card");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/ip22zilog.c b/drivers/tty/serial/ip22zilog.c
new file mode 100644
index 000000000000..7b1cda59ebb5
--- /dev/null
+++ b/drivers/tty/serial/ip22zilog.c
@@ -0,0 +1,1221 @@
+/*
+ * Driver for Zilog serial chips found on SGI workstations and
+ * servers.  This driver could actually be made more generic.
+ *
+ * This is based on the drivers/serial/sunzilog.c code as of 2.6.0-test7 and the
+ * old drivers/sgi/char/sgiserial.c code which itself is based of the original
+ * drivers/sbus/char/zs.c code.  A lot of code has been simply moved over
+ * directly from there but much has been rewritten.  Credits therefore go out
+ * to David S. Miller, Eddie C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell
+ * for their work there.
+ *
+ *  Copyright (C) 2002 Ralf Baechle (ralf@linux-mips.org)
+ *  Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/sgialib.h>
+#include <asm/sgi/ioc.h>
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ip22.h>
+
+#if defined(CONFIG_SERIAL_IP22_ZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#include "ip22zilog.h"
+
+/*
+ * On IP22 we need to delay after register accesses but we do not need to
+ * flush writes.
+ */
+#define ZSDELAY()               udelay(5)
+#define ZSDELAY_LONG()          udelay(20)
+#define ZS_WSYNC(channel)       do { } while (0)
+
+#define NUM_IP22ZILOG           1
+#define NUM_CHANNELS            (NUM_IP22ZILOG * 2)
+
+#define ZS_CLOCK                3672000 /* Zilog input clock rate. */
+#define ZS_CLOCK_DIVISOR        16      /* Divisor this driver uses. */
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct uart_ip22zilog_port {
+        struct uart_port                port;
+
+        /* IRQ servicing chain.  */
+        struct uart_ip22zilog_port      *next;
+
+        /* Current values of Zilog write registers.  */
+        unsigned char                   curregs[NUM_ZSREGS];
+
+        unsigned int                    flags;
+#define IP22ZILOG_FLAG_IS_CONS          0x00000004
+#define IP22ZILOG_FLAG_IS_KGDB          0x00000008
+#define IP22ZILOG_FLAG_MODEM_STATUS     0x00000010
+#define IP22ZILOG_FLAG_IS_CHANNEL_A     0x00000020
+#define IP22ZILOG_FLAG_REGS_HELD        0x00000040
+#define IP22ZILOG_FLAG_TX_STOPPED       0x00000080
+#define IP22ZILOG_FLAG_TX_ACTIVE        0x00000100
+#define IP22ZILOG_FLAG_RESET_DONE       0x00000200
+
+        unsigned int                    tty_break;
+
+        unsigned char                   parity_mask;
+        unsigned char                   prev_status;
+};
+
+#define ZILOG_CHANNEL_FROM_PORT(PORT)   ((struct zilog_channel *)((PORT)->membase))
+#define UART_ZILOG(PORT)                ((struct uart_ip22zilog_port *)(PORT))
+#define IP22ZILOG_GET_CURR_REG(PORT, REGNUM)            \
+        (UART_ZILOG(PORT)->curregs[REGNUM])
+#define IP22ZILOG_SET_CURR_REG(PORT, REGNUM, REGVAL)    \
+        ((UART_ZILOG(PORT)->curregs[REGNUM]) = (REGVAL))
+#define ZS_IS_CONS(UP)  ((UP)->flags & IP22ZILOG_FLAG_IS_CONS)
+#define ZS_IS_KGDB(UP)  ((UP)->flags & IP22ZILOG_FLAG_IS_KGDB)
+#define ZS_WANTS_MODEM_STATUS(UP)       ((UP)->flags & IP22ZILOG_FLAG_MODEM_STATUS)
+#define ZS_IS_CHANNEL_A(UP)     ((UP)->flags & IP22ZILOG_FLAG_IS_CHANNEL_A)
+#define ZS_REGS_HELD(UP)        ((UP)->flags & IP22ZILOG_FLAG_REGS_HELD)
+#define ZS_TX_STOPPED(UP)       ((UP)->flags & IP22ZILOG_FLAG_TX_STOPPED)
+#define ZS_TX_ACTIVE(UP)        ((UP)->flags & IP22ZILOG_FLAG_TX_ACTIVE)
+
+/* Reading and writing Zilog8530 registers.  The delays are to make this
+ * driver work on the IP22 which needs a settling delay after each chip
+ * register access, other machines handle this in hardware via auxiliary
+ * flip-flops which implement the settle time we do in software.
+ *
+ * The port lock must be held and local IRQs must be disabled
+ * when {read,write}_zsreg is invoked.
+ */
+static unsigned char read_zsreg(struct zilog_channel *channel,
+                                unsigned char reg)
+{
+        unsigned char retval;
+
+        writeb(reg, &channel->control);
+        ZSDELAY();
+        retval = readb(&channel->control);
+        ZSDELAY();
+
+        return retval;
+}
+
+static void write_zsreg(struct zilog_channel *channel,
+                        unsigned char reg, unsigned char value)
+{
+        writeb(reg, &channel->control);
+        ZSDELAY();
+        writeb(value, &channel->control);
+        ZSDELAY();
+}
+
+static void ip22zilog_clear_fifo(struct zilog_channel *channel)
+{
+        int i;
+
+        for (i = 0; i < 32; i++) {
+                unsigned char regval;
+
+                regval = readb(&channel->control);
+                ZSDELAY();
+                if (regval & Rx_CH_AV)
+                        break;
+
+                regval = read_zsreg(channel, R1);
+                readb(&channel->data);
+                ZSDELAY();
+
+                if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+                        writeb(ERR_RES, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+                }
+        }
+}
+
+/* This function must only be called when the TX is not busy.  The UART
+ * port lock must be held and local interrupts disabled.
+ */
+static void __load_zsregs(struct zilog_channel *channel, unsigned char *regs)
+{
+        int i;
+
+        /* Let pending transmits finish.  */
+        for (i = 0; i < 1000; i++) {
+                unsigned char stat = read_zsreg(channel, R1);
+                if (stat & ALL_SNT)
+                        break;
+                udelay(100);
+        }
+
+        writeb(ERR_RES, &channel->control);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+
+        ip22zilog_clear_fifo(channel);
+
+        /* Disable all interrupts.  */
+        write_zsreg(channel, R1,
+                    regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
+
+        /* Set parity, sync config, stop bits, and clock divisor.  */
+        write_zsreg(channel, R4, regs[R4]);
+
+        /* Set misc. TX/RX control bits.  */
+        write_zsreg(channel, R10, regs[R10]);
+
+        /* Set TX/RX controls sans the enable bits.  */
+        write_zsreg(channel, R3, regs[R3] & ~RxENAB);
+        write_zsreg(channel, R5, regs[R5] & ~TxENAB);
+
+        /* Synchronous mode config.  */
+        write_zsreg(channel, R6, regs[R6]);
+        write_zsreg(channel, R7, regs[R7]);
+
+        /* Don't mess with the interrupt vector (R2, unused by us) and
+         * master interrupt control (R9).  We make sure this is setup
+         * properly at probe time then never touch it again.
+         */
+
+        /* Disable baud generator.  */
+        write_zsreg(channel, R14, regs[R14] & ~BRENAB);
+
+        /* Clock mode control.  */
+        write_zsreg(channel, R11, regs[R11]);
+
+        /* Lower and upper byte of baud rate generator divisor.  */
+        write_zsreg(channel, R12, regs[R12]);
+        write_zsreg(channel, R13, regs[R13]);
+
+        /* Now rewrite R14, with BRENAB (if set).  */
+        write_zsreg(channel, R14, regs[R14]);
+
+        /* External status interrupt control.  */
+        write_zsreg(channel, R15, regs[R15]);
+
+        /* Reset external status interrupts.  */
+        write_zsreg(channel, R0, RES_EXT_INT);
+        write_zsreg(channel, R0, RES_EXT_INT);
+
+        /* Rewrite R3/R5, this time without enables masked.  */
+        write_zsreg(channel, R3, regs[R3]);
+        write_zsreg(channel, R5, regs[R5]);
+
+        /* Rewrite R1, this time without IRQ enabled masked.  */
+        write_zsreg(channel, R1, regs[R1]);
+}
+
+/* Reprogram the Zilog channel HW registers with the copies found in the
+ * software state struct.  If the transmitter is busy, we defer this update
+ * until the next TX complete interrupt.  Else, we do it right now.
+ *
+ * The UART port lock must be held and local interrupts disabled.
+ */
+static void ip22zilog_maybe_update_regs(struct uart_ip22zilog_port *up,
+                                       struct zilog_channel *channel)
+{
+        if (!ZS_REGS_HELD(up)) {
+                if (ZS_TX_ACTIVE(up)) {
+                        up->flags |= IP22ZILOG_FLAG_REGS_HELD;
+                } else {
+                        __load_zsregs(channel, up->curregs);
+                }
+        }
+}
+
+#define Rx_BRK 0x0100                   /* BREAK event software flag.  */
+#define Rx_SYS 0x0200                   /* SysRq event software flag.  */
+
+static struct tty_struct *ip22zilog_receive_chars(struct uart_ip22zilog_port *up,
+                                                  struct zilog_channel *channel)
+{
+        struct tty_struct *tty;
+        unsigned char ch, flag;
+        unsigned int r1;
+
+        tty = NULL;
+        if (up->port.state != NULL &&
+            up->port.state->port.tty != NULL)
+                tty = up->port.state->port.tty;
+
+        for (;;) {
+                ch = readb(&channel->control);
+                ZSDELAY();
+                if (!(ch & Rx_CH_AV))
+                        break;
+
+                r1 = read_zsreg(channel, R1);
+                if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+                        writeb(ERR_RES, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+                }
+
+                ch = readb(&channel->data);
+                ZSDELAY();
+
+                ch &= up->parity_mask;
+
+                /* Handle the null char got when BREAK is removed.  */
+                if (!ch)
+                        r1 |= up->tty_break;
+
+                /* A real serial line, record the character and status.  */
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+                if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | Rx_SYS | Rx_BRK)) {
+                        up->tty_break = 0;
+
+                        if (r1 & (Rx_SYS | Rx_BRK)) {
+                                up->port.icount.brk++;
+                                if (r1 & Rx_SYS)
+                                        continue;
+                                r1 &= ~(PAR_ERR | CRC_ERR);
+                        }
+                        else if (r1 & PAR_ERR)
+                                up->port.icount.parity++;
+                        else if (r1 & CRC_ERR)
+                                up->port.icount.frame++;
+                        if (r1 & Rx_OVR)
+                                up->port.icount.overrun++;
+                        r1 &= up->port.read_status_mask;
+                        if (r1 & Rx_BRK)
+                                flag = TTY_BREAK;
+                        else if (r1 & PAR_ERR)
+                                flag = TTY_PARITY;
+                        else if (r1 & CRC_ERR)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        continue;
+
+                if (tty)
+                        uart_insert_char(&up->port, r1, Rx_OVR, ch, flag);
+        }
+        return tty;
+}
+
+static void ip22zilog_status_handle(struct uart_ip22zilog_port *up,
+                                   struct zilog_channel *channel)
+{
+        unsigned char status;
+
+        status = readb(&channel->control);
+        ZSDELAY();
+
+        writeb(RES_EXT_INT, &channel->control);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+
+        if (up->curregs[R15] & BRKIE) {
+                if ((status & BRK_ABRT) && !(up->prev_status & BRK_ABRT)) {
+                        if (uart_handle_break(&up->port))
+                                up->tty_break = Rx_SYS;
+                        else
+                                up->tty_break = Rx_BRK;
+                }
+        }
+
+        if (ZS_WANTS_MODEM_STATUS(up)) {
+                if (status & SYNC)
+                        up->port.icount.dsr++;
+
+                /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
+                 * But it does not tell us which bit has changed, we have to keep
+                 * track of this ourselves.
+                 */
+                if ((status ^ up->prev_status) ^ DCD)
+                        uart_handle_dcd_change(&up->port,
+                                               (status & DCD));
+                if ((status ^ up->prev_status) ^ CTS)
+                        uart_handle_cts_change(&up->port,
+                                               (status & CTS));
+
+                wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+        }
+
+        up->prev_status = status;
+}
+
+static void ip22zilog_transmit_chars(struct uart_ip22zilog_port *up,
+                                    struct zilog_channel *channel)
+{
+        struct circ_buf *xmit;
+
+        if (ZS_IS_CONS(up)) {
+                unsigned char status = readb(&channel->control);
+                ZSDELAY();
+
+                /* TX still busy?  Just wait for the next TX done interrupt.
+                 *
+                 * It can occur because of how we do serial console writes.  It would
+                 * be nice to transmit console writes just like we normally would for
+                 * a TTY line. (ie. buffered and TX interrupt driven).  That is not
+                 * easy because console writes cannot sleep.  One solution might be
+                 * to poll on enough port->xmit space becoming free.  -DaveM
+                 */
+                if (!(status & Tx_BUF_EMP))
+                        return;
+        }
+
+        up->flags &= ~IP22ZILOG_FLAG_TX_ACTIVE;
+
+        if (ZS_REGS_HELD(up)) {
+                __load_zsregs(channel, up->curregs);
+                up->flags &= ~IP22ZILOG_FLAG_REGS_HELD;
+        }
+
+        if (ZS_TX_STOPPED(up)) {
+                up->flags &= ~IP22ZILOG_FLAG_TX_STOPPED;
+                goto ack_tx_int;
+        }
+
+        if (up->port.x_char) {
+                up->flags |= IP22ZILOG_FLAG_TX_ACTIVE;
+                writeb(up->port.x_char, &channel->data);
+                ZSDELAY();
+                ZS_WSYNC(channel);
+
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+
+        if (up->port.state == NULL)
+                goto ack_tx_int;
+        xmit = &up->port.state->xmit;
+        if (uart_circ_empty(xmit))
+                goto ack_tx_int;
+        if (uart_tx_stopped(&up->port))
+                goto ack_tx_int;
+
+        up->flags |= IP22ZILOG_FLAG_TX_ACTIVE;
+        writeb(xmit->buf[xmit->tail], &channel->data);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+
+        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+        up->port.icount.tx++;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        return;
+
+ack_tx_int:
+        writeb(RES_Tx_P, &channel->control);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+}
+
+static irqreturn_t ip22zilog_interrupt(int irq, void *dev_id)
+{
+        struct uart_ip22zilog_port *up = dev_id;
+
+        while (up) {
+                struct zilog_channel *channel
+                        = ZILOG_CHANNEL_FROM_PORT(&up->port);
+                struct tty_struct *tty;
+                unsigned char r3;
+
+                spin_lock(&up->port.lock);
+                r3 = read_zsreg(channel, R3);
+
+                /* Channel A */
+                tty = NULL;
+                if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
+                        writeb(RES_H_IUS, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+
+                        if (r3 & CHARxIP)
+                                tty = ip22zilog_receive_chars(up, channel);
+                        if (r3 & CHAEXT)
+                                ip22zilog_status_handle(up, channel);
+                        if (r3 & CHATxIP)
+                                ip22zilog_transmit_chars(up, channel);
+                }
+                spin_unlock(&up->port.lock);
+
+                if (tty)
+                        tty_flip_buffer_push(tty);
+
+                /* Channel B */
+                up = up->next;
+                channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+                spin_lock(&up->port.lock);
+                tty = NULL;
+                if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
+                        writeb(RES_H_IUS, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+
+                        if (r3 & CHBRxIP)
+                                tty = ip22zilog_receive_chars(up, channel);
+                        if (r3 & CHBEXT)
+                                ip22zilog_status_handle(up, channel);
+                        if (r3 & CHBTxIP)
+                                ip22zilog_transmit_chars(up, channel);
+                }
+                spin_unlock(&up->port.lock);
+
+                if (tty)
+                        tty_flip_buffer_push(tty);
+
+                up = up->next;
+        }
+
+        return IRQ_HANDLED;
+}
+
+/* A convenient way to quickly get R0 status.  The caller must _not_ hold the
+ * port lock, it is acquired here.
+ */
+static __inline__ unsigned char ip22zilog_read_channel_status(struct uart_port *port)
+{
+        struct zilog_channel *channel;
+        unsigned char status;
+
+        channel = ZILOG_CHANNEL_FROM_PORT(port);
+        status = readb(&channel->control);
+        ZSDELAY();
+
+        return status;
+}
+
+/* The port lock is not held.  */
+static unsigned int ip22zilog_tx_empty(struct uart_port *port)
+{
+        unsigned long flags;
+        unsigned char status;
+        unsigned int ret;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        status = ip22zilog_read_channel_status(port);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        if (status & Tx_BUF_EMP)
+                ret = TIOCSER_TEMT;
+        else
+                ret = 0;
+
+        return ret;
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static unsigned int ip22zilog_get_mctrl(struct uart_port *port)
+{
+        unsigned char status;
+        unsigned int ret;
+
+        status = ip22zilog_read_channel_status(port);
+
+        ret = 0;
+        if (status & DCD)
+                ret |= TIOCM_CAR;
+        if (status & SYNC)
+                ret |= TIOCM_DSR;
+        if (status & CTS)
+                ret |= TIOCM_CTS;
+
+        return ret;
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static void ip22zilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port;
+        struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char set_bits, clear_bits;
+
+        set_bits = clear_bits = 0;
+
+        if (mctrl & TIOCM_RTS)
+                set_bits |= RTS;
+        else
+                clear_bits |= RTS;
+        if (mctrl & TIOCM_DTR)
+                set_bits |= DTR;
+        else
+                clear_bits |= DTR;
+
+        /* NOTE: Not subject to 'transmitter active' rule.  */
+        up->curregs[R5] |= set_bits;
+        up->curregs[R5] &= ~clear_bits;
+        write_zsreg(channel, R5, up->curregs[R5]);
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static void ip22zilog_stop_tx(struct uart_port *port)
+{
+        struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port;
+
+        up->flags |= IP22ZILOG_FLAG_TX_STOPPED;
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static void ip22zilog_start_tx(struct uart_port *port)
+{
+        struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port;
+        struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char status;
+
+        up->flags |= IP22ZILOG_FLAG_TX_ACTIVE;
+        up->flags &= ~IP22ZILOG_FLAG_TX_STOPPED;
+
+        status = readb(&channel->control);
+        ZSDELAY();
+
+        /* TX busy?  Just wait for the TX done interrupt.  */
+        if (!(status & Tx_BUF_EMP))
+                return;
+
+        /* Send the first character to jump-start the TX done
+         * IRQ sending engine.
+         */
+        if (port->x_char) {
+                writeb(port->x_char, &channel->data);
+                ZSDELAY();
+                ZS_WSYNC(channel);
+
+                port->icount.tx++;
+                port->x_char = 0;
+        } else {
+                struct circ_buf *xmit = &port->state->xmit;
+
+                writeb(xmit->buf[xmit->tail], &channel->data);
+                ZSDELAY();
+                ZS_WSYNC(channel);
+
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+
+                if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                        uart_write_wakeup(&up->port);
+        }
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static void ip22zilog_stop_rx(struct uart_port *port)
+{
+        struct uart_ip22zilog_port *up = UART_ZILOG(port);
+        struct zilog_channel *channel;
+
+        if (ZS_IS_CONS(up))
+                return;
+
+        channel = ZILOG_CHANNEL_FROM_PORT(port);
+
+        /* Disable all RX interrupts.  */
+        up->curregs[R1] &= ~RxINT_MASK;
+        ip22zilog_maybe_update_regs(up, channel);
+}
+
+/* The port lock is held.  */
+static void ip22zilog_enable_ms(struct uart_port *port)
+{
+        struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port;
+        struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char new_reg;
+
+        new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
+        if (new_reg != up->curregs[R15]) {
+                up->curregs[R15] = new_reg;
+
+                /* NOTE: Not subject to 'transmitter active' rule.  */
+                write_zsreg(channel, R15, up->curregs[R15]);
+        }
+}
+
+/* The port lock is not held.  */
+static void ip22zilog_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port;
+        struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char set_bits, clear_bits, new_reg;
+        unsigned long flags;
+
+        set_bits = clear_bits = 0;
+
+        if (break_state)
+                set_bits |= SND_BRK;
+        else
+                clear_bits |= SND_BRK;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
+        if (new_reg != up->curregs[R5]) {
+                up->curregs[R5] = new_reg;
+
+                /* NOTE: Not subject to 'transmitter active' rule.  */
+                write_zsreg(channel, R5, up->curregs[R5]);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void __ip22zilog_reset(struct uart_ip22zilog_port *up)
+{
+        struct zilog_channel *channel;
+        int i;
+
+        if (up->flags & IP22ZILOG_FLAG_RESET_DONE)
+                return;
+
+        /* Let pending transmits finish.  */
+        channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+        for (i = 0; i < 1000; i++) {
+                unsigned char stat = read_zsreg(channel, R1);
+                if (stat & ALL_SNT)
+                        break;
+                udelay(100);
+        }
+
+        if (!ZS_IS_CHANNEL_A(up)) {
+                up++;
+                channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+        }
+        write_zsreg(channel, R9, FHWRES);
+        ZSDELAY_LONG();
+        (void) read_zsreg(channel, R0);
+
+        up->flags |= IP22ZILOG_FLAG_RESET_DONE;
+        up->next->flags |= IP22ZILOG_FLAG_RESET_DONE;
+}
+
+static void __ip22zilog_startup(struct uart_ip22zilog_port *up)
+{
+        struct zilog_channel *channel;
+
+        channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+        __ip22zilog_reset(up);
+
+        __load_zsregs(channel, up->curregs);
+        /* set master interrupt enable */
+        write_zsreg(channel, R9, up->curregs[R9]);
+        up->prev_status = readb(&channel->control);
+
+        /* Enable receiver and transmitter.  */
+        up->curregs[R3] |= RxENAB;
+        up->curregs[R5] |= TxENAB;
+
+        up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+        ip22zilog_maybe_update_regs(up, channel);
+}
+
+static int ip22zilog_startup(struct uart_port *port)
+{
+        struct uart_ip22zilog_port *up = UART_ZILOG(port);
+        unsigned long flags;
+
+        if (ZS_IS_CONS(up))
+                return 0;
+
+        spin_lock_irqsave(&port->lock, flags);
+        __ip22zilog_startup(up);
+        spin_unlock_irqrestore(&port->lock, flags);
+        return 0;
+}
+
+/*
+ * The test for ZS_IS_CONS is explained by the following e-mail:
+ *****
+ * From: Russell King <rmk@arm.linux.org.uk>
+ * Date: Sun, 8 Dec 2002 10:18:38 +0000
+ *
+ * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
+ * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
+ * > and I noticed that something is not right with reference
+ * > counting in this case. It seems that when the console
+ * > is open by kernel initially, this is not accounted
+ * > as an open, and uart_startup is not called.
+ *
+ * That is correct.  We are unable to call uart_startup when the serial
+ * console is initialised because it may need to allocate memory (as
+ * request_irq does) and the memory allocators may not have been
+ * initialised.
+ *
+ * 1. initialise the port into a state where it can send characters in the
+ *    console write method.
+ *
+ * 2. don't do the actual hardware shutdown in your shutdown() method (but
+ *    do the normal software shutdown - ie, free irqs etc)
+ *****
+ */
+static void ip22zilog_shutdown(struct uart_port *port)
+{
+        struct uart_ip22zilog_port *up = UART_ZILOG(port);
+        struct zilog_channel *channel;
+        unsigned long flags;
+
+        if (ZS_IS_CONS(up))
+                return;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        channel = ZILOG_CHANNEL_FROM_PORT(port);
+
+        /* Disable receiver and transmitter.  */
+        up->curregs[R3] &= ~RxENAB;
+        up->curregs[R5] &= ~TxENAB;
+
+        /* Disable all interrupts and BRK assertion.  */
+        up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+        up->curregs[R5] &= ~SND_BRK;
+        ip22zilog_maybe_update_regs(up, channel);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/* Shared by TTY driver and serial console setup.  The port lock is held
+ * and local interrupts are disabled.
+ */
+static void
+ip22zilog_convert_to_zs(struct uart_ip22zilog_port *up, unsigned int cflag,
+                       unsigned int iflag, int brg)
+{
+
+        up->curregs[R10] = NRZ;
+        up->curregs[R11] = TCBR | RCBR;
+
+        /* Program BAUD and clock source. */
+        up->curregs[R4] &= ~XCLK_MASK;
+        up->curregs[R4] |= X16CLK;
+        up->curregs[R12] = brg & 0xff;
+        up->curregs[R13] = (brg >> 8) & 0xff;
+        up->curregs[R14] = BRENAB;
+
+        /* Character size, stop bits, and parity. */
+        up->curregs[3] &= ~RxN_MASK;
+        up->curregs[5] &= ~TxN_MASK;
+        switch (cflag & CSIZE) {
+        case CS5:
+                up->curregs[3] |= Rx5;
+                up->curregs[5] |= Tx5;
+                up->parity_mask = 0x1f;
+                break;
+        case CS6:
+                up->curregs[3] |= Rx6;
+                up->curregs[5] |= Tx6;
+                up->parity_mask = 0x3f;
+                break;
+        case CS7:
+                up->curregs[3] |= Rx7;
+                up->curregs[5] |= Tx7;
+                up->parity_mask = 0x7f;
+                break;
+        case CS8:
+        default:
+                up->curregs[3] |= Rx8;
+                up->curregs[5] |= Tx8;
+                up->parity_mask = 0xff;
+                break;
+        };
+        up->curregs[4] &= ~0x0c;
+        if (cflag & CSTOPB)
+                up->curregs[4] |= SB2;
+        else
+                up->curregs[4] |= SB1;
+        if (cflag & PARENB)
+                up->curregs[4] |= PAR_ENAB;
+        else
+                up->curregs[4] &= ~PAR_ENAB;
+        if (!(cflag & PARODD))
+                up->curregs[4] |= PAR_EVEN;
+        else
+                up->curregs[4] &= ~PAR_EVEN;
+
+        up->port.read_status_mask = Rx_OVR;
+        if (iflag & INPCK)
+                up->port.read_status_mask |= CRC_ERR | PAR_ERR;
+        if (iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= BRK_ABRT;
+
+        up->port.ignore_status_mask = 0;
+        if (iflag & IGNPAR)
+                up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
+        if (iflag & IGNBRK) {
+                up->port.ignore_status_mask |= BRK_ABRT;
+                if (iflag & IGNPAR)
+                        up->port.ignore_status_mask |= Rx_OVR;
+        }
+
+        if ((cflag & CREAD) == 0)
+                up->port.ignore_status_mask = 0xff;
+}
+
+/* The port lock is not held.  */
+static void
+ip22zilog_set_termios(struct uart_port *port, struct ktermios *termios,
+                      struct ktermios *old)
+{
+        struct uart_ip22zilog_port *up = (struct uart_ip22zilog_port *) port;
+        unsigned long flags;
+        int baud, brg;
+
+        baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+
+        ip22zilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
+
+        if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+                up->flags |= IP22ZILOG_FLAG_MODEM_STATUS;
+        else
+                up->flags &= ~IP22ZILOG_FLAG_MODEM_STATUS;
+
+        ip22zilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static const char *ip22zilog_type(struct uart_port *port)
+{
+        return "IP22-Zilog";
+}
+
+/* We do not request/release mappings of the registers here, this
+ * happens at early serial probe time.
+ */
+static void ip22zilog_release_port(struct uart_port *port)
+{
+}
+
+static int ip22zilog_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/* These do not need to do anything interesting either.  */
+static void ip22zilog_config_port(struct uart_port *port, int flags)
+{
+}
+
+/* We do not support letting the user mess with the divisor, IRQ, etc. */
+static int ip22zilog_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+static struct uart_ops ip22zilog_pops = {
+        .tx_empty       =       ip22zilog_tx_empty,
+        .set_mctrl      =       ip22zilog_set_mctrl,
+        .get_mctrl      =       ip22zilog_get_mctrl,
+        .stop_tx        =       ip22zilog_stop_tx,
+        .start_tx       =       ip22zilog_start_tx,
+        .stop_rx        =       ip22zilog_stop_rx,
+        .enable_ms      =       ip22zilog_enable_ms,
+        .break_ctl      =       ip22zilog_break_ctl,
+        .startup        =       ip22zilog_startup,
+        .shutdown       =       ip22zilog_shutdown,
+        .set_termios    =       ip22zilog_set_termios,
+        .type           =       ip22zilog_type,
+        .release_port   =       ip22zilog_release_port,
+        .request_port   =       ip22zilog_request_port,
+        .config_port    =       ip22zilog_config_port,
+        .verify_port    =       ip22zilog_verify_port,
+};
+
+static struct uart_ip22zilog_port *ip22zilog_port_table;
+static struct zilog_layout **ip22zilog_chip_regs;
+
+static struct uart_ip22zilog_port *ip22zilog_irq_chain;
+static int zilog_irq = -1;
+
+static void * __init alloc_one_table(unsigned long size)
+{
+        return kzalloc(size, GFP_KERNEL);
+}
+
+static void __init ip22zilog_alloc_tables(void)
+{
+        ip22zilog_port_table = (struct uart_ip22zilog_port *)
+                alloc_one_table(NUM_CHANNELS * sizeof(struct uart_ip22zilog_port));
+        ip22zilog_chip_regs = (struct zilog_layout **)
+                alloc_one_table(NUM_IP22ZILOG * sizeof(struct zilog_layout *));
+
+        if (ip22zilog_port_table == NULL || ip22zilog_chip_regs == NULL) {
+                panic("IP22-Zilog: Cannot allocate IP22-Zilog tables.");
+        }
+}
+
+/* Get the address of the registers for IP22-Zilog instance CHIP.  */
+static struct zilog_layout * __init get_zs(int chip)
+{
+        unsigned long base;
+
+        if (chip < 0 || chip >= NUM_IP22ZILOG) {
+                panic("IP22-Zilog: Illegal chip number %d in get_zs.", chip);
+        }
+
+        /* Not probe-able, hard code it. */
+        base = (unsigned long) &sgioc->uart;
+
+        zilog_irq = SGI_SERIAL_IRQ;
+        request_mem_region(base, 8, "IP22-Zilog");
+
+        return (struct zilog_layout *) base;
+}
+
+#define ZS_PUT_CHAR_MAX_DELAY   2000    /* 10 ms */
+
+#ifdef CONFIG_SERIAL_IP22_ZILOG_CONSOLE
+static void ip22zilog_put_char(struct uart_port *port, int ch)
+{
+        struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        int loops = ZS_PUT_CHAR_MAX_DELAY;
+
+        /* This is a timed polling loop so do not switch the explicit
+         * udelay with ZSDELAY as that is a NOP on some platforms.  -DaveM
+         */
+        do {
+                unsigned char val = readb(&channel->control);
+                if (val & Tx_BUF_EMP) {
+                        ZSDELAY();
+                        break;
+                }
+                udelay(5);
+        } while (--loops);
+
+        writeb(ch, &channel->data);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+}
+
+static void
+ip22zilog_console_write(struct console *con, const char *s, unsigned int count)
+{
+        struct uart_ip22zilog_port *up = &ip22zilog_port_table[con->index];
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        uart_console_write(&up->port, s, count, ip22zilog_put_char);
+        udelay(2);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int __init ip22zilog_console_setup(struct console *con, char *options)
+{
+        struct uart_ip22zilog_port *up = &ip22zilog_port_table[con->index];
+        unsigned long flags;
+        int baud = 9600, bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        up->flags |= IP22ZILOG_FLAG_IS_CONS;
+
+        printk(KERN_INFO "Console: ttyS%d (IP22-Zilog)\n", con->index);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        up->curregs[R15] |= BRKIE;
+
+        __ip22zilog_startup(up);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        return uart_set_options(&up->port, con, baud, parity, bits, flow);
+}
+
+static struct uart_driver ip22zilog_reg;
+
+static struct console ip22zilog_console = {
+        .name   =       "ttyS",
+        .write  =       ip22zilog_console_write,
+        .device =       uart_console_device,
+        .setup  =       ip22zilog_console_setup,
+        .flags  =       CON_PRINTBUFFER,
+        .index  =       -1,
+        .data   =       &ip22zilog_reg,
+};
+#endif /* CONFIG_SERIAL_IP22_ZILOG_CONSOLE */
+
+static struct uart_driver ip22zilog_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "serial",
+        .dev_name       = "ttyS",
+        .major          = TTY_MAJOR,
+        .minor          = 64,
+        .nr             = NUM_CHANNELS,
+#ifdef CONFIG_SERIAL_IP22_ZILOG_CONSOLE
+        .cons           = &ip22zilog_console,
+#endif
+};
+
+static void __init ip22zilog_prepare(void)
+{
+        struct uart_ip22zilog_port *up;
+        struct zilog_layout *rp;
+        int channel, chip;
+
+        /*
+         * Temporary fix.
+         */
+        for (channel = 0; channel < NUM_CHANNELS; channel++)
+                spin_lock_init(&ip22zilog_port_table[channel].port.lock);
+
+        ip22zilog_irq_chain = &ip22zilog_port_table[NUM_CHANNELS - 1];
+        up = &ip22zilog_port_table[0];
+        for (channel = NUM_CHANNELS - 1 ; channel > 0; channel--)
+                up[channel].next = &up[channel - 1];
+        up[channel].next = NULL;
+
+        for (chip = 0; chip < NUM_IP22ZILOG; chip++) {
+                if (!ip22zilog_chip_regs[chip]) {
+                        ip22zilog_chip_regs[chip] = rp = get_zs(chip);
+
+                        up[(chip * 2) + 0].port.membase = (char *) &rp->channelB;
+                        up[(chip * 2) + 1].port.membase = (char *) &rp->channelA;
+
+                        /* In theory mapbase is the physical address ...  */
+                        up[(chip * 2) + 0].port.mapbase =
+                                (unsigned long) ioremap((unsigned long) &rp->channelB, 8);
+                        up[(chip * 2) + 1].port.mapbase =
+                                (unsigned long) ioremap((unsigned long) &rp->channelA, 8);
+                }
+
+                /* Channel A */
+                up[(chip * 2) + 0].port.iotype = UPIO_MEM;
+                up[(chip * 2) + 0].port.irq = zilog_irq;
+                up[(chip * 2) + 0].port.uartclk = ZS_CLOCK;
+                up[(chip * 2) + 0].port.fifosize = 1;
+                up[(chip * 2) + 0].port.ops = &ip22zilog_pops;
+                up[(chip * 2) + 0].port.type = PORT_IP22ZILOG;
+                up[(chip * 2) + 0].port.flags = 0;
+                up[(chip * 2) + 0].port.line = (chip * 2) + 0;
+                up[(chip * 2) + 0].flags = 0;
+
+                /* Channel B */
+                up[(chip * 2) + 1].port.iotype = UPIO_MEM;
+                up[(chip * 2) + 1].port.irq = zilog_irq;
+                up[(chip * 2) + 1].port.uartclk = ZS_CLOCK;
+                up[(chip * 2) + 1].port.fifosize = 1;
+                up[(chip * 2) + 1].port.ops = &ip22zilog_pops;
+                up[(chip * 2) + 1].port.type = PORT_IP22ZILOG;
+                up[(chip * 2) + 1].port.line = (chip * 2) + 1;
+                up[(chip * 2) + 1].flags |= IP22ZILOG_FLAG_IS_CHANNEL_A;
+        }
+
+        for (channel = 0; channel < NUM_CHANNELS; channel++) {
+                struct uart_ip22zilog_port *up = &ip22zilog_port_table[channel];
+                int brg;
+
+                /* Normal serial TTY. */
+                up->parity_mask = 0xff;
+                up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+                up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
+                up->curregs[R3] = RxENAB | Rx8;
+                up->curregs[R5] = TxENAB | Tx8;
+                up->curregs[R9] = NV | MIE;
+                up->curregs[R10] = NRZ;
+                up->curregs[R11] = TCBR | RCBR;
+                brg = BPS_TO_BRG(9600, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+                up->curregs[R12] = (brg & 0xff);
+                up->curregs[R13] = (brg >> 8) & 0xff;
+                up->curregs[R14] = BRENAB;
+        }
+}
+
+static int __init ip22zilog_ports_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: IP22 Zilog driver (%d chips).\n", NUM_IP22ZILOG);
+
+        ip22zilog_prepare();
+
+        if (request_irq(zilog_irq, ip22zilog_interrupt, 0,
+                        "IP22-Zilog", ip22zilog_irq_chain)) {
+                panic("IP22-Zilog: Unable to register zs interrupt handler.\n");
+        }
+
+        ret = uart_register_driver(&ip22zilog_reg);
+        if (ret == 0) {
+                int i;
+
+                for (i = 0; i < NUM_CHANNELS; i++) {
+                        struct uart_ip22zilog_port *up = &ip22zilog_port_table[i];
+
+                        uart_add_one_port(&ip22zilog_reg, &up->port);
+                }
+        }
+
+        return ret;
+}
+
+static int __init ip22zilog_init(void)
+{
+        /* IP22 Zilog setup is hard coded, no probing to do.  */
+        ip22zilog_alloc_tables();
+        ip22zilog_ports_init();
+
+        return 0;
+}
+
+static void __exit ip22zilog_exit(void)
+{
+        int i;
+        struct uart_ip22zilog_port *up;
+
+        for (i = 0; i < NUM_CHANNELS; i++) {
+                up = &ip22zilog_port_table[i];
+
+                uart_remove_one_port(&ip22zilog_reg, &up->port);
+        }
+
+        /* Free IO mem */
+        up = &ip22zilog_port_table[0];
+        for (i = 0; i < NUM_IP22ZILOG; i++) {
+                if (up[(i * 2) + 0].port.mapbase) {
+                   iounmap((void*)up[(i * 2) + 0].port.mapbase);
+                   up[(i * 2) + 0].port.mapbase = 0;
+                }
+                if (up[(i * 2) + 1].port.mapbase) {
+                        iounmap((void*)up[(i * 2) + 1].port.mapbase);
+                        up[(i * 2) + 1].port.mapbase = 0;
+                }
+        }
+
+        uart_unregister_driver(&ip22zilog_reg);
+}
+
+module_init(ip22zilog_init);
+module_exit(ip22zilog_exit);
+
+/* David wrote it but I'm to blame for the bugs ...  */
+MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
+MODULE_DESCRIPTION("SGI Zilog serial port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/ip22zilog.h b/drivers/tty/serial/ip22zilog.h
new file mode 100644
index 000000000000..a59a9a8341d2
--- /dev/null
+++ b/drivers/tty/serial/ip22zilog.h
@@ -0,0 +1,281 @@
+#ifndef _IP22_ZILOG_H
+#define _IP22_ZILOG_H
+
+#include <asm/byteorder.h>
+
+struct zilog_channel {
+#ifdef __BIG_ENDIAN
+        volatile unsigned char unused0[3];
+        volatile unsigned char control;
+        volatile unsigned char unused1[3];
+        volatile unsigned char data;
+#else /* __LITTLE_ENDIAN */
+        volatile unsigned char control;
+        volatile unsigned char unused0[3];
+        volatile unsigned char data;
+        volatile unsigned char unused1[3];
+#endif
+};
+
+struct zilog_layout {
+        struct zilog_channel channelB;
+        struct zilog_channel channelA;
+};
+
+#define NUM_ZSREGS    16
+
+/* Conversion routines to/from brg time constants from/to bits
+ * per second.
+ */
+#define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
+#define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
+
+/* The Zilog register set */
+
+#define FLAG    0x7e
+
+/* Write Register 0 */
+#define R0      0               /* Register selects */
+#define R1      1
+#define R2      2
+#define R3      3
+#define R4      4
+#define R5      5
+#define R6      6
+#define R7      7
+#define R8      8
+#define R9      9
+#define R10     10
+#define R11     11
+#define R12     12
+#define R13     13
+#define R14     14
+#define R15     15
+
+#define NULLCODE        0       /* Null Code */
+#define POINT_HIGH      0x8     /* Select upper half of registers */
+#define RES_EXT_INT     0x10    /* Reset Ext. Status Interrupts */
+#define SEND_ABORT      0x18    /* HDLC Abort */
+#define RES_RxINT_FC    0x20    /* Reset RxINT on First Character */
+#define RES_Tx_P        0x28    /* Reset TxINT Pending */
+#define ERR_RES         0x30    /* Error Reset */
+#define RES_H_IUS       0x38    /* Reset highest IUS */
+
+#define RES_Rx_CRC      0x40    /* Reset Rx CRC Checker */
+#define RES_Tx_CRC      0x80    /* Reset Tx CRC Checker */
+#define RES_EOM_L       0xC0    /* Reset EOM latch */
+
+/* Write Register 1 */
+
+#define EXT_INT_ENAB    0x1     /* Ext Int Enable */
+#define TxINT_ENAB      0x2     /* Tx Int Enable */
+#define PAR_SPEC        0x4     /* Parity is special condition */
+
+#define RxINT_DISAB     0       /* Rx Int Disable */
+#define RxINT_FCERR     0x8     /* Rx Int on First Character Only or Error */
+#define INT_ALL_Rx      0x10    /* Int on all Rx Characters or error */
+#define INT_ERR_Rx      0x18    /* Int on error only */
+#define RxINT_MASK      0x18
+
+#define WT_RDY_RT       0x20    /* Wait/Ready on R/T */
+#define WT_FN_RDYFN     0x40    /* Wait/FN/Ready FN */
+#define WT_RDY_ENAB     0x80    /* Wait/Ready Enable */
+
+/* Write Register #2 (Interrupt Vector) */
+
+/* Write Register 3 */
+
+#define RxENAB          0x1     /* Rx Enable */
+#define SYNC_L_INH      0x2     /* Sync Character Load Inhibit */
+#define ADD_SM          0x4     /* Address Search Mode (SDLC) */
+#define RxCRC_ENAB      0x8     /* Rx CRC Enable */
+#define ENT_HM          0x10    /* Enter Hunt Mode */
+#define AUTO_ENAB       0x20    /* Auto Enables */
+#define Rx5             0x0     /* Rx 5 Bits/Character */
+#define Rx7             0x40    /* Rx 7 Bits/Character */
+#define Rx6             0x80    /* Rx 6 Bits/Character */
+#define Rx8             0xc0    /* Rx 8 Bits/Character */
+#define RxN_MASK        0xc0
+
+/* Write Register 4 */
+
+#define PAR_ENAB        0x1     /* Parity Enable */
+#define PAR_EVEN        0x2     /* Parity Even/Odd* */
+
+#define SYNC_ENAB       0       /* Sync Modes Enable */
+#define SB1             0x4     /* 1 stop bit/char */
+#define SB15            0x8     /* 1.5 stop bits/char */
+#define SB2             0xc     /* 2 stop bits/char */
+
+#define MONSYNC         0       /* 8 Bit Sync character */
+#define BISYNC          0x10    /* 16 bit sync character */
+#define SDLC            0x20    /* SDLC Mode (01111110 Sync Flag) */
+#define EXTSYNC         0x30    /* External Sync Mode */
+
+#define X1CLK           0x0     /* x1 clock mode */
+#define X16CLK          0x40    /* x16 clock mode */
+#define X32CLK          0x80    /* x32 clock mode */
+#define X64CLK          0xC0    /* x64 clock mode */
+#define XCLK_MASK       0xC0
+
+/* Write Register 5 */
+
+#define TxCRC_ENAB      0x1     /* Tx CRC Enable */
+#define RTS             0x2     /* RTS */
+#define SDLC_CRC        0x4     /* SDLC/CRC-16 */
+#define TxENAB          0x8     /* Tx Enable */
+#define SND_BRK         0x10    /* Send Break */
+#define Tx5             0x0     /* Tx 5 bits (or less)/character */
+#define Tx7             0x20    /* Tx 7 bits/character */
+#define Tx6             0x40    /* Tx 6 bits/character */
+#define Tx8             0x60    /* Tx 8 bits/character */
+#define TxN_MASK        0x60
+#define DTR             0x80    /* DTR */
+
+/* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
+
+/* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
+
+/* Write Register 8 (transmit buffer) */
+
+/* Write Register 9 (Master interrupt control) */
+#define VIS     1       /* Vector Includes Status */
+#define NV      2       /* No Vector */
+#define DLC     4       /* Disable Lower Chain */
+#define MIE     8       /* Master Interrupt Enable */
+#define STATHI  0x10    /* Status high */
+#define NORESET 0       /* No reset on write to R9 */
+#define CHRB    0x40    /* Reset channel B */
+#define CHRA    0x80    /* Reset channel A */
+#define FHWRES  0xc0    /* Force hardware reset */
+
+/* Write Register 10 (misc control bits) */
+#define BIT6    1       /* 6 bit/8bit sync */
+#define LOOPMODE 2      /* SDLC Loop mode */
+#define ABUNDER 4       /* Abort/flag on SDLC xmit underrun */
+#define MARKIDLE 8      /* Mark/flag on idle */
+#define GAOP    0x10    /* Go active on poll */
+#define NRZ     0       /* NRZ mode */
+#define NRZI    0x20    /* NRZI mode */
+#define FM1     0x40    /* FM1 (transition = 1) */
+#define FM0     0x60    /* FM0 (transition = 0) */
+#define CRCPS   0x80    /* CRC Preset I/O */
+
+/* Write Register 11 (Clock Mode control) */
+#define TRxCXT  0       /* TRxC = Xtal output */
+#define TRxCTC  1       /* TRxC = Transmit clock */
+#define TRxCBR  2       /* TRxC = BR Generator Output */
+#define TRxCDP  3       /* TRxC = DPLL output */
+#define TRxCOI  4       /* TRxC O/I */
+#define TCRTxCP 0       /* Transmit clock = RTxC pin */
+#define TCTRxCP 8       /* Transmit clock = TRxC pin */
+#define TCBR    0x10    /* Transmit clock = BR Generator output */
+#define TCDPLL  0x18    /* Transmit clock = DPLL output */
+#define RCRTxCP 0       /* Receive clock = RTxC pin */
+#define RCTRxCP 0x20    /* Receive clock = TRxC pin */
+#define RCBR    0x40    /* Receive clock = BR Generator output */
+#define RCDPLL  0x60    /* Receive clock = DPLL output */
+#define RTxCX   0x80    /* RTxC Xtal/No Xtal */
+
+/* Write Register 12 (lower byte of baud rate generator time constant) */
+
+/* Write Register 13 (upper byte of baud rate generator time constant) */
+
+/* Write Register 14 (Misc control bits) */
+#define BRENAB  1       /* Baud rate generator enable */
+#define BRSRC   2       /* Baud rate generator source */
+#define DTRREQ  4       /* DTR/Request function */
+#define AUTOECHO 8      /* Auto Echo */
+#define LOOPBAK 0x10    /* Local loopback */
+#define SEARCH  0x20    /* Enter search mode */
+#define RMC     0x40    /* Reset missing clock */
+#define DISDPLL 0x60    /* Disable DPLL */
+#define SSBR    0x80    /* Set DPLL source = BR generator */
+#define SSRTxC  0xa0    /* Set DPLL source = RTxC */
+#define SFMM    0xc0    /* Set FM mode */
+#define SNRZI   0xe0    /* Set NRZI mode */
+
+/* Write Register 15 (external/status interrupt control) */
+#define ZCIE    2       /* Zero count IE */
+#define DCDIE   8       /* DCD IE */
+#define SYNCIE  0x10    /* Sync/hunt IE */
+#define CTSIE   0x20    /* CTS IE */
+#define TxUIE   0x40    /* Tx Underrun/EOM IE */
+#define BRKIE   0x80    /* Break/Abort IE */
+
+
+/* Read Register 0 */
+#define Rx_CH_AV        0x1     /* Rx Character Available */
+#define ZCOUNT          0x2     /* Zero count */
+#define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
+#define DCD             0x8     /* DCD */
+#define SYNC            0x10    /* Sync/hunt */
+#define CTS             0x20    /* CTS */
+#define TxEOM           0x40    /* Tx underrun */
+#define BRK_ABRT        0x80    /* Break/Abort */
+
+/* Read Register 1 */
+#define ALL_SNT         0x1     /* All sent */
+/* Residue Data for 8 Rx bits/char programmed */
+#define RES3            0x8     /* 0/3 */
+#define RES4            0x4     /* 0/4 */
+#define RES5            0xc     /* 0/5 */
+#define RES6            0x2     /* 0/6 */
+#define RES7            0xa     /* 0/7 */
+#define RES8            0x6     /* 0/8 */
+#define RES18           0xe     /* 1/8 */
+#define RES28           0x0     /* 2/8 */
+/* Special Rx Condition Interrupts */
+#define PAR_ERR         0x10    /* Parity error */
+#define Rx_OVR          0x20    /* Rx Overrun Error */
+#define CRC_ERR         0x40    /* CRC/Framing Error */
+#define END_FR          0x80    /* End of Frame (SDLC) */
+
+/* Read Register 2 (channel b only) - Interrupt vector */
+#define CHB_Tx_EMPTY    0x00
+#define CHB_EXT_STAT    0x02
+#define CHB_Rx_AVAIL    0x04
+#define CHB_SPECIAL     0x06
+#define CHA_Tx_EMPTY    0x08
+#define CHA_EXT_STAT    0x0a
+#define CHA_Rx_AVAIL    0x0c
+#define CHA_SPECIAL     0x0e
+#define STATUS_MASK     0x0e
+
+/* Read Register 3 (interrupt pending register) ch a only */
+#define CHBEXT  0x1             /* Channel B Ext/Stat IP */
+#define CHBTxIP 0x2             /* Channel B Tx IP */
+#define CHBRxIP 0x4             /* Channel B Rx IP */
+#define CHAEXT  0x8             /* Channel A Ext/Stat IP */
+#define CHATxIP 0x10            /* Channel A Tx IP */
+#define CHARxIP 0x20            /* Channel A Rx IP */
+
+/* Read Register 8 (receive data register) */
+
+/* Read Register 10  (misc status bits) */
+#define ONLOOP  2               /* On loop */
+#define LOOPSEND 0x10           /* Loop sending */
+#define CLK2MIS 0x40            /* Two clocks missing */
+#define CLK1MIS 0x80            /* One clock missing */
+
+/* Read Register 12 (lower byte of baud rate generator constant) */
+
+/* Read Register 13 (upper byte of baud rate generator constant) */
+
+/* Read Register 15 (value of WR 15) */
+
+/* Misc macros */
+#define ZS_CLEARERR(channel)    do { writeb(ERR_RES, &channel->control); \
+                                     udelay(5); } while(0)
+
+#define ZS_CLEARSTAT(channel)   do { writeb(RES_EXT_INT, &channel->control); \
+                                     udelay(5); } while(0)
+
+#define ZS_CLEARFIFO(channel)   do { readb(&channel->data); \
+                                     udelay(2); \
+                                     readb(&channel->data); \
+                                     udelay(2); \
+                                     readb(&channel->data); \
+                                     udelay(2); } while(0)
+
+#endif /* _IP22_ZILOG_H */
diff --git a/drivers/tty/serial/jsm/Makefile b/drivers/tty/serial/jsm/Makefile
new file mode 100644
index 000000000000..e46b6e0f8b18
--- /dev/null
+++ b/drivers/tty/serial/jsm/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for Jasmine adapter
+#
+
+obj-$(CONFIG_SERIAL_JSM) += jsm.o
+
+jsm-objs :=    jsm_driver.o jsm_neo.o jsm_tty.o
+
diff --git a/drivers/tty/serial/jsm/jsm.h b/drivers/tty/serial/jsm/jsm.h
new file mode 100644
index 000000000000..b704c8ce0d71
--- /dev/null
+++ b/drivers/tty/serial/jsm/jsm.h
@@ -0,0 +1,388 @@
+/************************************************************************
+ * Copyright 2003 Digi International (www.digi.com)
+ *
+ * Copyright (C) 2004 IBM Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ *
+ * Contact Information:
+ * Scott H Kilau <Scott_Kilau@digi.com>
+ * Wendy Xiong   <wendyx@us.ibm.com>
+ *
+ ***********************************************************************/
+
+#ifndef __JSM_DRIVER_H
+#define __JSM_DRIVER_H
+
+#include <linux/kernel.h>
+#include <linux/types.h>        /* To pick up the varions Linux types */
+#include <linux/tty.h>
+#include <linux/serial_core.h>
+#include <linux/device.h>
+
+/*
+ * Debugging levels can be set using debug insmod variable
+ * They can also be compiled out completely.
+ */
+enum {
+        DBG_INIT        = 0x01,
+        DBG_BASIC       = 0x02,
+        DBG_CORE        = 0x04,
+        DBG_OPEN        = 0x08,
+        DBG_CLOSE       = 0x10,
+        DBG_READ        = 0x20,
+        DBG_WRITE       = 0x40,
+        DBG_IOCTL       = 0x80,
+        DBG_PROC        = 0x100,
+        DBG_PARAM       = 0x200,
+        DBG_PSCAN       = 0x400,
+        DBG_EVENT       = 0x800,
+        DBG_DRAIN       = 0x1000,
+        DBG_MSIGS       = 0x2000,
+        DBG_MGMT        = 0x4000,
+        DBG_INTR        = 0x8000,
+        DBG_CARR        = 0x10000,
+};
+
+#define jsm_printk(nlevel, klevel, pdev, fmt, args...)  \
+        if ((DBG_##nlevel & jsm_debug))                 \
+        dev_printk(KERN_##klevel, pdev->dev, fmt, ## args)
+
+#define MAXLINES        256
+#define MAXPORTS        8
+#define MAX_STOPS_SENT  5
+
+/* Board type definitions */
+
+#define T_NEO           0000
+#define T_CLASSIC       0001
+#define T_PCIBUS        0400
+
+/* Board State Definitions */
+
+#define BD_RUNNING      0x0
+#define BD_REASON       0x7f
+#define BD_NOTFOUND     0x1
+#define BD_NOIOPORT     0x2
+#define BD_NOMEM        0x3
+#define BD_NOBIOS       0x4
+#define BD_NOFEP        0x5
+#define BD_FAILED       0x6
+#define BD_ALLOCATED    0x7
+#define BD_TRIBOOT      0x8
+#define BD_BADKME       0x80
+
+
+/* 4 extra for alignment play space */
+#define WRITEBUFLEN     ((4096) + 4)
+#define MYFLIPLEN       N_TTY_BUF_SIZE
+
+#define JSM_VERSION     "jsm: 1.2-1-INKERNEL"
+#define JSM_PARTNUM     "40002438_A-INKERNEL"
+
+struct jsm_board;
+struct jsm_channel;
+
+/************************************************************************
+ * Per board operations structure                                       *
+ ************************************************************************/
+struct board_ops {
+        irq_handler_t intr;
+        void (*uart_init) (struct jsm_channel *ch);
+        void (*uart_off) (struct jsm_channel *ch);
+        void (*param) (struct jsm_channel *ch);
+        void (*assert_modem_signals) (struct jsm_channel *ch);
+        void (*flush_uart_write) (struct jsm_channel *ch);
+        void (*flush_uart_read) (struct jsm_channel *ch);
+        void (*disable_receiver) (struct jsm_channel *ch);
+        void (*enable_receiver) (struct jsm_channel *ch);
+        void (*send_break) (struct jsm_channel *ch);
+        void (*clear_break) (struct jsm_channel *ch, int);
+        void (*send_start_character) (struct jsm_channel *ch);
+        void (*send_stop_character) (struct jsm_channel *ch);
+        void (*copy_data_from_queue_to_uart) (struct jsm_channel *ch);
+        u32 (*get_uart_bytes_left) (struct jsm_channel *ch);
+        void (*send_immediate_char) (struct jsm_channel *ch, unsigned char);
+};
+
+
+/*
+ *      Per-board information
+ */
+struct jsm_board
+{
+        int             boardnum;       /* Board number: 0-32 */
+
+        int             type;           /* Type of board */
+        u8              rev;            /* PCI revision ID */
+        struct pci_dev  *pci_dev;
+        u32             maxports;       /* MAX ports this board can handle */
+
+        spinlock_t      bd_intr_lock;   /* Used to protect the poller tasklet and
+                                         * the interrupt routine from each other.
+                                         */
+
+        u32             nasync;         /* Number of ports on card */
+
+        u32             irq;            /* Interrupt request number */
+
+        u64             membase;        /* Start of base memory of the card */
+        u64             membase_end;    /* End of base memory of the card */
+
+        u8      __iomem *re_map_membase;/* Remapped memory of the card */
+
+        u64             iobase;         /* Start of io base of the card */
+        u64             iobase_end;     /* End of io base of the card */
+
+        u32             bd_uart_offset; /* Space between each UART */
+
+        struct jsm_channel *channels[MAXPORTS]; /* array of pointers to our channels. */
+        char            *flipbuf;       /* Our flip buffer, alloced if board is found */
+
+        u32             bd_dividend;    /* Board/UARTs specific dividend */
+
+        struct board_ops *bd_ops;
+
+        struct list_head jsm_board_entry;
+};
+
+/************************************************************************
+ * Device flag definitions for ch_flags.
+ ************************************************************************/
+#define CH_PRON         0x0001          /* Printer on string            */
+#define CH_STOP         0x0002          /* Output is stopped            */
+#define CH_STOPI        0x0004          /* Input is stopped             */
+#define CH_CD           0x0008          /* Carrier is present           */
+#define CH_FCAR         0x0010          /* Carrier forced on            */
+#define CH_HANGUP       0x0020          /* Hangup received              */
+
+#define CH_RECEIVER_OFF 0x0040          /* Receiver is off              */
+#define CH_OPENING      0x0080          /* Port in fragile open state   */
+#define CH_CLOSING      0x0100          /* Port in fragile close state  */
+#define CH_FIFO_ENABLED 0x0200          /* Port has FIFOs enabled       */
+#define CH_TX_FIFO_EMPTY 0x0400         /* TX Fifo is completely empty  */
+#define CH_TX_FIFO_LWM  0x0800          /* TX Fifo is below Low Water   */
+#define CH_BREAK_SENDING 0x1000         /* Break is being sent          */
+#define CH_LOOPBACK 0x2000              /* Channel is in lookback mode  */
+#define CH_FLIPBUF_IN_USE 0x4000        /* Channel's flipbuf is in use  */
+#define CH_BAUD0        0x08000         /* Used for checking B0 transitions */
+
+/* Our Read/Error/Write queue sizes */
+#define RQUEUEMASK      0x1FFF          /* 8 K - 1 */
+#define EQUEUEMASK      0x1FFF          /* 8 K - 1 */
+#define WQUEUEMASK      0x0FFF          /* 4 K - 1 */
+#define RQUEUESIZE      (RQUEUEMASK + 1)
+#define EQUEUESIZE      RQUEUESIZE
+#define WQUEUESIZE      (WQUEUEMASK + 1)
+
+
+/************************************************************************
+ * Channel information structure.
+ ************************************************************************/
+struct jsm_channel {
+        struct uart_port uart_port;
+        struct jsm_board        *ch_bd;         /* Board structure pointer      */
+
+        spinlock_t      ch_lock;        /* provide for serialization */
+        wait_queue_head_t ch_flags_wait;
+
+        u32             ch_portnum;     /* Port number, 0 offset.       */
+        u32             ch_open_count;  /* open count                   */
+        u32             ch_flags;       /* Channel flags                */
+
+        u64             ch_close_delay; /* How long we should drop RTS/DTR for */
+
+        tcflag_t        ch_c_iflag;     /* channel iflags               */
+        tcflag_t        ch_c_cflag;     /* channel cflags               */
+        tcflag_t        ch_c_oflag;     /* channel oflags               */
+        tcflag_t        ch_c_lflag;     /* channel lflags               */
+        u8              ch_stopc;       /* Stop character               */
+        u8              ch_startc;      /* Start character              */
+
+        u8              ch_mostat;      /* FEP output modem status      */
+        u8              ch_mistat;      /* FEP input modem status       */
+
+        struct neo_uart_struct __iomem *ch_neo_uart;    /* Pointer to the "mapped" UART struct */
+        u8              ch_cached_lsr;  /* Cached value of the LSR register */
+
+        u8              *ch_rqueue;     /* Our read queue buffer - malloc'ed */
+        u16             ch_r_head;      /* Head location of the read queue */
+        u16             ch_r_tail;      /* Tail location of the read queue */
+
+        u8              *ch_equeue;     /* Our error queue buffer - malloc'ed */
+        u16             ch_e_head;      /* Head location of the error queue */
+        u16             ch_e_tail;      /* Tail location of the error queue */
+
+        u8              *ch_wqueue;     /* Our write queue buffer - malloc'ed */
+        u16             ch_w_head;      /* Head location of the write queue */
+        u16             ch_w_tail;      /* Tail location of the write queue */
+
+        u64             ch_rxcount;     /* total of data received so far */
+        u64             ch_txcount;     /* total of data transmitted so far */
+
+        u8              ch_r_tlevel;    /* Receive Trigger level */
+        u8              ch_t_tlevel;    /* Transmit Trigger level */
+
+        u8              ch_r_watermark; /* Receive Watermark */
+
+
+        u32             ch_stops_sent;  /* How many times I have sent a stop character
+                                         * to try to stop the other guy sending.
+                                         */
+        u64             ch_err_parity;  /* Count of parity errors on channel */
+        u64             ch_err_frame;   /* Count of framing errors on channel */
+        u64             ch_err_break;   /* Count of breaks on channel */
+        u64             ch_err_overrun; /* Count of overruns on channel */
+
+        u64             ch_xon_sends;   /* Count of xons transmitted */
+        u64             ch_xoff_sends;  /* Count of xoffs transmitted */
+};
+
+
+/************************************************************************
+ * Per channel/port NEO UART structure                                  *
+ ************************************************************************
+ *              Base Structure Entries Usage Meanings to Host           *
+ *                                                                      *
+ *      W = read write          R = read only                           *
+ *                      U = Unused.                                     *
+ ************************************************************************/
+
+struct neo_uart_struct {
+         u8 txrx;               /* WR   RHR/THR - Holding Reg */
+         u8 ier;                /* WR   IER - Interrupt Enable Reg */
+         u8 isr_fcr;            /* WR   ISR/FCR - Interrupt Status Reg/Fifo Control Reg */
+         u8 lcr;                /* WR   LCR - Line Control Reg */
+         u8 mcr;                /* WR   MCR - Modem Control Reg */
+         u8 lsr;                /* WR   LSR - Line Status Reg */
+         u8 msr;                /* WR   MSR - Modem Status Reg */
+         u8 spr;                /* WR   SPR - Scratch Pad Reg */
+         u8 fctr;               /* WR   FCTR - Feature Control Reg */
+         u8 efr;                /* WR   EFR - Enhanced Function Reg */
+         u8 tfifo;              /* WR   TXCNT/TXTRG - Transmit FIFO Reg */
+         u8 rfifo;              /* WR   RXCNT/RXTRG - Receive FIFO Reg */
+         u8 xoffchar1;  /* WR   XOFF 1 - XOff Character 1 Reg */
+         u8 xoffchar2;  /* WR   XOFF 2 - XOff Character 2 Reg */
+         u8 xonchar1;   /* WR   XON 1 - Xon Character 1 Reg */
+         u8 xonchar2;   /* WR   XON 2 - XOn Character 2 Reg */
+
+         u8 reserved1[0x2ff - 0x200]; /* U      Reserved by Exar */
+         u8 txrxburst[64];      /* RW   64 bytes of RX/TX FIFO Data */
+         u8 reserved2[0x37f - 0x340]; /* U      Reserved by Exar */
+         u8 rxburst_with_errors[64];    /* R    64 bytes of RX FIFO Data + LSR */
+};
+
+/* Where to read the extended interrupt register (32bits instead of 8bits) */
+#define UART_17158_POLL_ADDR_OFFSET     0x80
+
+/*
+ * These are the redefinitions for the FCTR on the XR17C158, since
+ * Exar made them different than their earlier design. (XR16C854)
+ */
+
+/* These are only applicable when table D is selected */
+#define UART_17158_FCTR_RTS_NODELAY     0x00
+#define UART_17158_FCTR_RTS_4DELAY      0x01
+#define UART_17158_FCTR_RTS_6DELAY      0x02
+#define UART_17158_FCTR_RTS_8DELAY      0x03
+#define UART_17158_FCTR_RTS_12DELAY     0x12
+#define UART_17158_FCTR_RTS_16DELAY     0x05
+#define UART_17158_FCTR_RTS_20DELAY     0x13
+#define UART_17158_FCTR_RTS_24DELAY     0x06
+#define UART_17158_FCTR_RTS_28DELAY     0x14
+#define UART_17158_FCTR_RTS_32DELAY     0x07
+#define UART_17158_FCTR_RTS_36DELAY     0x16
+#define UART_17158_FCTR_RTS_40DELAY     0x08
+#define UART_17158_FCTR_RTS_44DELAY     0x09
+#define UART_17158_FCTR_RTS_48DELAY     0x10
+#define UART_17158_FCTR_RTS_52DELAY     0x11
+
+#define UART_17158_FCTR_RTS_IRDA        0x10
+#define UART_17158_FCTR_RS485           0x20
+#define UART_17158_FCTR_TRGA            0x00
+#define UART_17158_FCTR_TRGB            0x40
+#define UART_17158_FCTR_TRGC            0x80
+#define UART_17158_FCTR_TRGD            0xC0
+
+/* 17158 trigger table selects.. */
+#define UART_17158_FCTR_BIT6            0x40
+#define UART_17158_FCTR_BIT7            0x80
+
+/* 17158 TX/RX memmapped buffer offsets */
+#define UART_17158_RX_FIFOSIZE          64
+#define UART_17158_TX_FIFOSIZE          64
+
+/* 17158 Extended IIR's */
+#define UART_17158_IIR_RDI_TIMEOUT      0x0C    /* Receiver data TIMEOUT */
+#define UART_17158_IIR_XONXOFF          0x10    /* Received an XON/XOFF char */
+#define UART_17158_IIR_HWFLOW_STATE_CHANGE 0x20 /* CTS/DSR or RTS/DTR state change */
+#define UART_17158_IIR_FIFO_ENABLED     0xC0    /* 16550 FIFOs are Enabled */
+
+/*
+ * These are the extended interrupts that get sent
+ * back to us from the UART's 32bit interrupt register
+ */
+#define UART_17158_RX_LINE_STATUS       0x1     /* RX Ready */
+#define UART_17158_RXRDY_TIMEOUT        0x2     /* RX Ready Timeout */
+#define UART_17158_TXRDY                0x3     /* TX Ready */
+#define UART_17158_MSR                  0x4     /* Modem State Change */
+#define UART_17158_TX_AND_FIFO_CLR      0x40    /* Transmitter Holding Reg Empty */
+#define UART_17158_RX_FIFO_DATA_ERROR   0x80    /* UART detected an RX FIFO Data error */
+
+/*
+ * These are the EXTENDED definitions for the 17C158's Interrupt
+ * Enable Register.
+ */
+#define UART_17158_EFR_ECB      0x10    /* Enhanced control bit */
+#define UART_17158_EFR_IXON     0x2     /* Receiver compares Xon1/Xoff1 */
+#define UART_17158_EFR_IXOFF    0x8     /* Transmit Xon1/Xoff1 */
+#define UART_17158_EFR_RTSDTR   0x40    /* Auto RTS/DTR Flow Control Enable */
+#define UART_17158_EFR_CTSDSR   0x80    /* Auto CTS/DSR Flow COntrol Enable */
+
+#define UART_17158_XOFF_DETECT  0x1     /* Indicates whether chip saw an incoming XOFF char */
+#define UART_17158_XON_DETECT   0x2     /* Indicates whether chip saw an incoming XON char */
+
+#define UART_17158_IER_RSVD1    0x10    /* Reserved by Exar */
+#define UART_17158_IER_XOFF     0x20    /* Xoff Interrupt Enable */
+#define UART_17158_IER_RTSDTR   0x40    /* Output Interrupt Enable */
+#define UART_17158_IER_CTSDSR   0x80    /* Input Interrupt Enable */
+
+#define PCI_DEVICE_NEO_2DB9_PCI_NAME            "Neo 2 - DB9 Universal PCI"
+#define PCI_DEVICE_NEO_2DB9PRI_PCI_NAME         "Neo 2 - DB9 Universal PCI - Powered Ring Indicator"
+#define PCI_DEVICE_NEO_2RJ45_PCI_NAME           "Neo 2 - RJ45 Universal PCI"
+#define PCI_DEVICE_NEO_2RJ45PRI_PCI_NAME        "Neo 2 - RJ45 Universal PCI - Powered Ring Indicator"
+#define PCIE_DEVICE_NEO_IBM_PCI_NAME            "Neo 4 - PCI Express - IBM"
+
+/*
+ * Our Global Variables.
+ */
+extern struct   uart_driver jsm_uart_driver;
+extern struct   board_ops jsm_neo_ops;
+extern int      jsm_debug;
+
+/*************************************************************************
+ *
+ * Prototypes for non-static functions used in more than one module
+ *
+ *************************************************************************/
+int jsm_tty_write(struct uart_port *port);
+int jsm_tty_init(struct jsm_board *);
+int jsm_uart_port_init(struct jsm_board *);
+int jsm_remove_uart_port(struct jsm_board *);
+void jsm_input(struct jsm_channel *ch);
+void jsm_check_queue_flow_control(struct jsm_channel *ch);
+
+#endif
diff --git a/drivers/tty/serial/jsm/jsm_driver.c b/drivers/tty/serial/jsm/jsm_driver.c
new file mode 100644
index 000000000000..96da17868cf3
--- /dev/null
+++ b/drivers/tty/serial/jsm/jsm_driver.c
@@ -0,0 +1,297 @@
+/************************************************************************
+ * Copyright 2003 Digi International (www.digi.com)
+ *
+ * Copyright (C) 2004 IBM Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ *
+ * Contact Information:
+ * Scott H Kilau <Scott_Kilau@digi.com>
+ * Wendy Xiong   <wendyx@us.ibm.com>
+ *
+ *
+ ***********************************************************************/
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+#include "jsm.h"
+
+MODULE_AUTHOR("Digi International, http://www.digi.com");
+MODULE_DESCRIPTION("Driver for the Digi International "
+                   "Neo PCI based product line");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("jsm");
+
+#define JSM_DRIVER_NAME "jsm"
+#define NR_PORTS        32
+#define JSM_MINOR_START 0
+
+struct uart_driver jsm_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = JSM_DRIVER_NAME,
+        .dev_name       = "ttyn",
+        .major          = 0,
+        .minor          = JSM_MINOR_START,
+        .nr             = NR_PORTS,
+};
+
+static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
+                                       pci_channel_state_t state);
+static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev);
+static void jsm_io_resume(struct pci_dev *pdev);
+
+static struct pci_error_handlers jsm_err_handler = {
+        .error_detected = jsm_io_error_detected,
+        .slot_reset = jsm_io_slot_reset,
+        .resume = jsm_io_resume,
+};
+
+int jsm_debug;
+module_param(jsm_debug, int, 0);
+MODULE_PARM_DESC(jsm_debug, "Driver debugging level");
+
+static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+        int rc = 0;
+        struct jsm_board *brd;
+        static int adapter_count = 0;
+
+        rc = pci_enable_device(pdev);
+        if (rc) {
+                dev_err(&pdev->dev, "Device enable FAILED\n");
+                goto out;
+        }
+
+        rc = pci_request_regions(pdev, "jsm");
+        if (rc) {
+                dev_err(&pdev->dev, "pci_request_region FAILED\n");
+                goto out_disable_device;
+        }
+
+        brd = kzalloc(sizeof(struct jsm_board), GFP_KERNEL);
+        if (!brd) {
+                dev_err(&pdev->dev,
+                        "memory allocation for board structure failed\n");
+                rc = -ENOMEM;
+                goto out_release_regions;
+        }
+
+        /* store the info for the board we've found */
+        brd->boardnum = adapter_count++;
+        brd->pci_dev = pdev;
+        if (pdev->device == PCIE_DEVICE_ID_NEO_4_IBM)
+                brd->maxports = 4;
+        else if (pdev->device == PCI_DEVICE_ID_DIGI_NEO_8)
+                brd->maxports = 8;
+        else
+                brd->maxports = 2;
+
+        spin_lock_init(&brd->bd_intr_lock);
+
+        /* store which revision we have */
+        brd->rev = pdev->revision;
+
+        brd->irq = pdev->irq;
+
+        jsm_printk(INIT, INFO, &brd->pci_dev,
+                "jsm_found_board - NEO adapter\n");
+
+        /* get the PCI Base Address Registers */
+        brd->membase    = pci_resource_start(pdev, 0);
+        brd->membase_end = pci_resource_end(pdev, 0);
+
+        if (brd->membase & 1)
+                brd->membase &= ~3;
+        else
+                brd->membase &= ~15;
+
+        /* Assign the board_ops struct */
+        brd->bd_ops = &jsm_neo_ops;
+
+        brd->bd_uart_offset = 0x200;
+        brd->bd_dividend = 921600;
+
+        brd->re_map_membase = ioremap(brd->membase, pci_resource_len(pdev, 0));
+        if (!brd->re_map_membase) {
+                dev_err(&pdev->dev,
+                        "card has no PCI Memory resources, "
+                        "failing board.\n");
+                rc = -ENOMEM;
+                goto out_kfree_brd;
+        }
+
+        rc = request_irq(brd->irq, brd->bd_ops->intr,
+                        IRQF_SHARED, "JSM", brd);
+        if (rc) {
+                printk(KERN_WARNING "Failed to hook IRQ %d\n",brd->irq);
+                goto out_iounmap;
+        }
+
+        rc = jsm_tty_init(brd);
+        if (rc < 0) {
+                dev_err(&pdev->dev, "Can't init tty devices (%d)\n", rc);
+                rc = -ENXIO;
+                goto out_free_irq;
+        }
+
+        rc = jsm_uart_port_init(brd);
+        if (rc < 0) {
+                /* XXX: leaking all resources from jsm_tty_init here! */
+                dev_err(&pdev->dev, "Can't init uart port (%d)\n", rc);
+                rc = -ENXIO;
+                goto out_free_irq;
+        }
+
+        /* Log the information about the board */
+        dev_info(&pdev->dev, "board %d: Digi Neo (rev %d), irq %d\n",
+                        adapter_count, brd->rev, brd->irq);
+
+        /*
+         * allocate flip buffer for board.
+         *
+         * Okay to malloc with GFP_KERNEL, we are not at interrupt
+         * context, and there are no locks held.
+         */
+        brd->flipbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
+        if (!brd->flipbuf) {
+                /* XXX: leaking all resources from jsm_tty_init and
+                        jsm_uart_port_init here! */
+                dev_err(&pdev->dev, "memory allocation for flipbuf failed\n");
+                rc = -ENOMEM;
+                goto out_free_uart;
+        }
+
+        pci_set_drvdata(pdev, brd);
+        pci_save_state(pdev);
+
+        return 0;
+ out_free_uart:
+        jsm_remove_uart_port(brd);
+ out_free_irq:
+        jsm_remove_uart_port(brd);
+        free_irq(brd->irq, brd);
+ out_iounmap:
+        iounmap(brd->re_map_membase);
+ out_kfree_brd:
+        kfree(brd);
+ out_release_regions:
+        pci_release_regions(pdev);
+ out_disable_device:
+        pci_disable_device(pdev);
+ out:
+        return rc;
+}
+
+static void __devexit jsm_remove_one(struct pci_dev *pdev)
+{
+        struct jsm_board *brd = pci_get_drvdata(pdev);
+        int i = 0;
+
+        jsm_remove_uart_port(brd);
+
+        free_irq(brd->irq, brd);
+        iounmap(brd->re_map_membase);
+
+        /* Free all allocated channels structs */
+        for (i = 0; i < brd->maxports; i++) {
+                if (brd->channels[i]) {
+                        kfree(brd->channels[i]->ch_rqueue);
+                        kfree(brd->channels[i]->ch_equeue);
+                        kfree(brd->channels[i]->ch_wqueue);
+                        kfree(brd->channels[i]);
+                }
+        }
+
+        pci_release_regions(pdev);
+        pci_disable_device(pdev);
+        kfree(brd->flipbuf);
+        kfree(brd);
+}
+
+static struct pci_device_id jsm_pci_tbl[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
+        { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
+        { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },
+        { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45PRI), 0, 0, 3 },
+        { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCIE_DEVICE_ID_NEO_4_IBM), 0, 0, 4 },
+        { PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_DIGI_NEO_8), 0, 0, 5 },
+        { 0, }
+};
+MODULE_DEVICE_TABLE(pci, jsm_pci_tbl);
+
+static struct pci_driver jsm_driver = {
+        .name           = "jsm",
+        .id_table       = jsm_pci_tbl,
+        .probe          = jsm_probe_one,
+        .remove         = __devexit_p(jsm_remove_one),
+        .err_handler    = &jsm_err_handler,
+};
+
+static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev,
+                                        pci_channel_state_t state)
+{
+        struct jsm_board *brd = pci_get_drvdata(pdev);
+
+        jsm_remove_uart_port(brd);
+
+        return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev)
+{
+        int rc;
+
+        rc = pci_enable_device(pdev);
+
+        if (rc)
+                return PCI_ERS_RESULT_DISCONNECT;
+
+        pci_set_master(pdev);
+
+        return PCI_ERS_RESULT_RECOVERED;
+}
+
+static void jsm_io_resume(struct pci_dev *pdev)
+{
+        struct jsm_board *brd = pci_get_drvdata(pdev);
+
+        pci_restore_state(pdev);
+
+        jsm_uart_port_init(brd);
+}
+
+static int __init jsm_init_module(void)
+{
+        int rc;
+
+        rc = uart_register_driver(&jsm_uart_driver);
+        if (!rc) {
+                rc = pci_register_driver(&jsm_driver);
+                if (rc)
+                        uart_unregister_driver(&jsm_uart_driver);
+        }
+        return rc;
+}
+
+static void __exit jsm_exit_module(void)
+{
+        pci_unregister_driver(&jsm_driver);
+        uart_unregister_driver(&jsm_uart_driver);
+}
+
+module_init(jsm_init_module);
+module_exit(jsm_exit_module);
diff --git a/drivers/tty/serial/jsm/jsm_neo.c b/drivers/tty/serial/jsm/jsm_neo.c
new file mode 100644
index 000000000000..4538c3e3646e
--- /dev/null
+++ b/drivers/tty/serial/jsm/jsm_neo.c
@@ -0,0 +1,1412 @@
+/************************************************************************
+ * Copyright 2003 Digi International (www.digi.com)
+ *
+ * Copyright (C) 2004 IBM Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ *
+ * Contact Information:
+ * Scott H Kilau <Scott_Kilau@digi.com>
+ * Wendy Xiong   <wendyx@us.ibm.com>
+ *
+ ***********************************************************************/
+#include <linux/delay.h>        /* For udelay */
+#include <linux/serial_reg.h>   /* For the various UART offsets */
+#include <linux/tty.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+
+#include "jsm.h"                /* Driver main header file */
+
+static u32 jsm_offset_table[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
+
+/*
+ * This function allows calls to ensure that all outstanding
+ * PCI writes have been completed, by doing a PCI read against
+ * a non-destructive, read-only location on the Neo card.
+ *
+ * In this case, we are reading the DVID (Read-only Device Identification)
+ * value of the Neo card.
+ */
+static inline void neo_pci_posting_flush(struct jsm_board *bd)
+{
+      readb(bd->re_map_membase + 0x8D);
+}
+
+static void neo_set_cts_flow_control(struct jsm_channel *ch)
+{
+        u8 ier, efr;
+        ier = readb(&ch->ch_neo_uart->ier);
+        efr = readb(&ch->ch_neo_uart->efr);
+
+        jsm_printk(PARAM, INFO, &ch->ch_bd->pci_dev, "Setting CTSFLOW\n");
+
+        /* Turn on auto CTS flow control */
+        ier |= (UART_17158_IER_CTSDSR);
+        efr |= (UART_17158_EFR_ECB | UART_17158_EFR_CTSDSR);
+
+        /* Turn off auto Xon flow control */
+        efr &= ~(UART_17158_EFR_IXON);
+
+        /* Why? Becuz Exar's spec says we have to zero it out before setting it */
+        writeb(0, &ch->ch_neo_uart->efr);
+
+        /* Turn on UART enhanced bits */
+        writeb(efr, &ch->ch_neo_uart->efr);
+
+        /* Turn on table D, with 8 char hi/low watermarks */
+        writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_4DELAY), &ch->ch_neo_uart->fctr);
+
+        /* Feed the UART our trigger levels */
+        writeb(8, &ch->ch_neo_uart->tfifo);
+        ch->ch_t_tlevel = 8;
+
+        writeb(ier, &ch->ch_neo_uart->ier);
+}
+
+static void neo_set_rts_flow_control(struct jsm_channel *ch)
+{
+        u8 ier, efr;
+        ier = readb(&ch->ch_neo_uart->ier);
+        efr = readb(&ch->ch_neo_uart->efr);
+
+        jsm_printk(PARAM, INFO, &ch->ch_bd->pci_dev, "Setting RTSFLOW\n");
+
+        /* Turn on auto RTS flow control */
+        ier |= (UART_17158_IER_RTSDTR);
+        efr |= (UART_17158_EFR_ECB | UART_17158_EFR_RTSDTR);
+
+        /* Turn off auto Xoff flow control */
+        ier &= ~(UART_17158_IER_XOFF);
+        efr &= ~(UART_17158_EFR_IXOFF);
+
+        /* Why? Becuz Exar's spec says we have to zero it out before setting it */
+        writeb(0, &ch->ch_neo_uart->efr);
+
+        /* Turn on UART enhanced bits */
+        writeb(efr, &ch->ch_neo_uart->efr);
+
+        writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_4DELAY), &ch->ch_neo_uart->fctr);
+        ch->ch_r_watermark = 4;
+
+        writeb(56, &ch->ch_neo_uart->rfifo);
+        ch->ch_r_tlevel = 56;
+
+        writeb(ier, &ch->ch_neo_uart->ier);
+
+        /*
+         * From the Neo UART spec sheet:
+         * The auto RTS/DTR function must be started by asserting
+         * RTS/DTR# output pin (MCR bit-0 or 1 to logic 1 after
+         * it is enabled.
+         */
+        ch->ch_mostat |= (UART_MCR_RTS);
+}
+
+
+static void neo_set_ixon_flow_control(struct jsm_channel *ch)
+{
+        u8 ier, efr;
+        ier = readb(&ch->ch_neo_uart->ier);
+        efr = readb(&ch->ch_neo_uart->efr);
+
+        jsm_printk(PARAM, INFO, &ch->ch_bd->pci_dev, "Setting IXON FLOW\n");
+
+        /* Turn off auto CTS flow control */
+        ier &= ~(UART_17158_IER_CTSDSR);
+        efr &= ~(UART_17158_EFR_CTSDSR);
+
+        /* Turn on auto Xon flow control */
+        efr |= (UART_17158_EFR_ECB | UART_17158_EFR_IXON);
+
+        /* Why? Becuz Exar's spec says we have to zero it out before setting it */
+        writeb(0, &ch->ch_neo_uart->efr);
+
+        /* Turn on UART enhanced bits */
+        writeb(efr, &ch->ch_neo_uart->efr);
+
+        writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr);
+        ch->ch_r_watermark = 4;
+
+        writeb(32, &ch->ch_neo_uart->rfifo);
+        ch->ch_r_tlevel = 32;
+
+        /* Tell UART what start/stop chars it should be looking for */
+        writeb(ch->ch_startc, &ch->ch_neo_uart->xonchar1);
+        writeb(0, &ch->ch_neo_uart->xonchar2);
+
+        writeb(ch->ch_stopc, &ch->ch_neo_uart->xoffchar1);
+        writeb(0, &ch->ch_neo_uart->xoffchar2);
+
+        writeb(ier, &ch->ch_neo_uart->ier);
+}
+
+static void neo_set_ixoff_flow_control(struct jsm_channel *ch)
+{
+        u8 ier, efr;
+        ier = readb(&ch->ch_neo_uart->ier);
+        efr = readb(&ch->ch_neo_uart->efr);
+
+        jsm_printk(PARAM, INFO, &ch->ch_bd->pci_dev, "Setting IXOFF FLOW\n");
+
+        /* Turn off auto RTS flow control */
+        ier &= ~(UART_17158_IER_RTSDTR);
+        efr &= ~(UART_17158_EFR_RTSDTR);
+
+        /* Turn on auto Xoff flow control */
+        ier |= (UART_17158_IER_XOFF);
+        efr |= (UART_17158_EFR_ECB | UART_17158_EFR_IXOFF);
+
+        /* Why? Becuz Exar's spec says we have to zero it out before setting it */
+        writeb(0, &ch->ch_neo_uart->efr);
+
+        /* Turn on UART enhanced bits */
+        writeb(efr, &ch->ch_neo_uart->efr);
+
+        /* Turn on table D, with 8 char hi/low watermarks */
+        writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr);
+
+        writeb(8, &ch->ch_neo_uart->tfifo);
+        ch->ch_t_tlevel = 8;
+
+        /* Tell UART what start/stop chars it should be looking for */
+        writeb(ch->ch_startc, &ch->ch_neo_uart->xonchar1);
+        writeb(0, &ch->ch_neo_uart->xonchar2);
+
+        writeb(ch->ch_stopc, &ch->ch_neo_uart->xoffchar1);
+        writeb(0, &ch->ch_neo_uart->xoffchar2);
+
+        writeb(ier, &ch->ch_neo_uart->ier);
+}
+
+static void neo_set_no_input_flow_control(struct jsm_channel *ch)
+{
+        u8 ier, efr;
+        ier = readb(&ch->ch_neo_uart->ier);
+        efr = readb(&ch->ch_neo_uart->efr);
+
+        jsm_printk(PARAM, INFO, &ch->ch_bd->pci_dev, "Unsetting Input FLOW\n");
+
+        /* Turn off auto RTS flow control */
+        ier &= ~(UART_17158_IER_RTSDTR);
+        efr &= ~(UART_17158_EFR_RTSDTR);
+
+        /* Turn off auto Xoff flow control */
+        ier &= ~(UART_17158_IER_XOFF);
+        if (ch->ch_c_iflag & IXON)
+                efr &= ~(UART_17158_EFR_IXOFF);
+        else
+                efr &= ~(UART_17158_EFR_ECB | UART_17158_EFR_IXOFF);
+
+        /* Why? Becuz Exar's spec says we have to zero it out before setting it */
+        writeb(0, &ch->ch_neo_uart->efr);
+
+        /* Turn on UART enhanced bits */
+        writeb(efr, &ch->ch_neo_uart->efr);
+
+        /* Turn on table D, with 8 char hi/low watermarks */
+        writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr);
+
+        ch->ch_r_watermark = 0;
+
+        writeb(16, &ch->ch_neo_uart->tfifo);
+        ch->ch_t_tlevel = 16;
+
+        writeb(16, &ch->ch_neo_uart->rfifo);
+        ch->ch_r_tlevel = 16;
+
+        writeb(ier, &ch->ch_neo_uart->ier);
+}
+
+static void neo_set_no_output_flow_control(struct jsm_channel *ch)
+{
+        u8 ier, efr;
+        ier = readb(&ch->ch_neo_uart->ier);
+        efr = readb(&ch->ch_neo_uart->efr);
+
+        jsm_printk(PARAM, INFO, &ch->ch_bd->pci_dev, "Unsetting Output FLOW\n");
+
+        /* Turn off auto CTS flow control */
+        ier &= ~(UART_17158_IER_CTSDSR);
+        efr &= ~(UART_17158_EFR_CTSDSR);
+
+        /* Turn off auto Xon flow control */
+        if (ch->ch_c_iflag & IXOFF)
+                efr &= ~(UART_17158_EFR_IXON);
+        else
+                efr &= ~(UART_17158_EFR_ECB | UART_17158_EFR_IXON);
+
+        /* Why? Becuz Exar's spec says we have to zero it out before setting it */
+        writeb(0, &ch->ch_neo_uart->efr);
+
+        /* Turn on UART enhanced bits */
+        writeb(efr, &ch->ch_neo_uart->efr);
+
+        /* Turn on table D, with 8 char hi/low watermarks */
+        writeb((UART_17158_FCTR_TRGD | UART_17158_FCTR_RTS_8DELAY), &ch->ch_neo_uart->fctr);
+
+        ch->ch_r_watermark = 0;
+
+        writeb(16, &ch->ch_neo_uart->tfifo);
+        ch->ch_t_tlevel = 16;
+
+        writeb(16, &ch->ch_neo_uart->rfifo);
+        ch->ch_r_tlevel = 16;
+
+        writeb(ier, &ch->ch_neo_uart->ier);
+}
+
+static inline void neo_set_new_start_stop_chars(struct jsm_channel *ch)
+{
+
+        /* if hardware flow control is set, then skip this whole thing */
+        if (ch->ch_c_cflag & CRTSCTS)
+                return;
+
+        jsm_printk(PARAM, INFO, &ch->ch_bd->pci_dev, "start\n");
+
+        /* Tell UART what start/stop chars it should be looking for */
+        writeb(ch->ch_startc, &ch->ch_neo_uart->xonchar1);
+        writeb(0, &ch->ch_neo_uart->xonchar2);
+
+        writeb(ch->ch_stopc, &ch->ch_neo_uart->xoffchar1);
+        writeb(0, &ch->ch_neo_uart->xoffchar2);
+}
+
+static void neo_copy_data_from_uart_to_queue(struct jsm_channel *ch)
+{
+        int qleft = 0;
+        u8 linestatus = 0;
+        u8 error_mask = 0;
+        int n = 0;
+        int total = 0;
+        u16 head;
+        u16 tail;
+
+        if (!ch)
+                return;
+
+        /* cache head and tail of queue */
+        head = ch->ch_r_head & RQUEUEMASK;
+        tail = ch->ch_r_tail & RQUEUEMASK;
+
+        /* Get our cached LSR */
+        linestatus = ch->ch_cached_lsr;
+        ch->ch_cached_lsr = 0;
+
+        /* Store how much space we have left in the queue */
+        if ((qleft = tail - head - 1) < 0)
+                qleft += RQUEUEMASK + 1;
+
+        /*
+         * If the UART is not in FIFO mode, force the FIFO copy to
+         * NOT be run, by setting total to 0.
+         *
+         * On the other hand, if the UART IS in FIFO mode, then ask
+         * the UART to give us an approximation of data it has RX'ed.
+         */
+        if (!(ch->ch_flags & CH_FIFO_ENABLED))
+                total = 0;
+        else {
+                total = readb(&ch->ch_neo_uart->rfifo);
+
+                /*
+                 * EXAR chip bug - RX FIFO COUNT - Fudge factor.
+                 *
+                 * This resolves a problem/bug with the Exar chip that sometimes
+                 * returns a bogus value in the rfifo register.
+                 * The count can be any where from 0-3 bytes "off".
+                 * Bizarre, but true.
+                 */
+                total -= 3;
+        }
+
+        /*
+         * Finally, bound the copy to make sure we don't overflow
+         * our own queue...
+         * The byte by byte copy loop below this loop this will
+         * deal with the queue overflow possibility.
+         */
+        total = min(total, qleft);
+
+        while (total > 0) {
+                /*
+                 * Grab the linestatus register, we need to check
+                 * to see if there are any errors in the FIFO.
+                 */
+                linestatus = readb(&ch->ch_neo_uart->lsr);
+
+                /*
+                 * Break out if there is a FIFO error somewhere.
+                 * This will allow us to go byte by byte down below,
+                 * finding the exact location of the error.
+                 */
+                if (linestatus & UART_17158_RX_FIFO_DATA_ERROR)
+                        break;
+
+                /* Make sure we don't go over the end of our queue */
+                n = min(((u32) total), (RQUEUESIZE - (u32) head));
+
+                /*
+                 * Cut down n even further if needed, this is to fix
+                 * a problem with memcpy_fromio() with the Neo on the
+                 * IBM pSeries platform.
+                 * 15 bytes max appears to be the magic number.
+                 */
+                n = min((u32) n, (u32) 12);
+
+                /*
+                 * Since we are grabbing the linestatus register, which
+                 * will reset some bits after our read, we need to ensure
+                 * we don't miss our TX FIFO emptys.
+                 */
+                if (linestatus & (UART_LSR_THRE | UART_17158_TX_AND_FIFO_CLR))
+                        ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+
+                linestatus = 0;
+
+                /* Copy data from uart to the queue */
+                memcpy_fromio(ch->ch_rqueue + head, &ch->ch_neo_uart->txrxburst, n);
+                /*
+                 * Since RX_FIFO_DATA_ERROR was 0, we are guaranteed
+                 * that all the data currently in the FIFO is free of
+                 * breaks and parity/frame/orun errors.
+                 */
+                memset(ch->ch_equeue + head, 0, n);
+
+                /* Add to and flip head if needed */
+                head = (head + n) & RQUEUEMASK;
+                total -= n;
+                qleft -= n;
+                ch->ch_rxcount += n;
+        }
+
+        /*
+         * Create a mask to determine whether we should
+         * insert the character (if any) into our queue.
+         */
+        if (ch->ch_c_iflag & IGNBRK)
+                error_mask |= UART_LSR_BI;
+
+        /*
+         * Now cleanup any leftover bytes still in the UART.
+         * Also deal with any possible queue overflow here as well.
+         */
+        while (1) {
+
+                /*
+                 * Its possible we have a linestatus from the loop above
+                 * this, so we "OR" on any extra bits.
+                 */
+                linestatus |= readb(&ch->ch_neo_uart->lsr);
+
+                /*
+                 * If the chip tells us there is no more data pending to
+                 * be read, we can then leave.
+                 * But before we do, cache the linestatus, just in case.
+                 */
+                if (!(linestatus & UART_LSR_DR)) {
+                        ch->ch_cached_lsr = linestatus;
+                        break;
+                }
+
+                /* No need to store this bit */
+                linestatus &= ~UART_LSR_DR;
+
+                /*
+                 * Since we are grabbing the linestatus register, which
+                 * will reset some bits after our read, we need to ensure
+                 * we don't miss our TX FIFO emptys.
+                 */
+                if (linestatus & (UART_LSR_THRE | UART_17158_TX_AND_FIFO_CLR)) {
+                        linestatus &= ~(UART_LSR_THRE | UART_17158_TX_AND_FIFO_CLR);
+                        ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+                }
+
+                /*
+                 * Discard character if we are ignoring the error mask.
+                 */
+                if (linestatus & error_mask) {
+                        u8 discard;
+                        linestatus = 0;
+                        memcpy_fromio(&discard, &ch->ch_neo_uart->txrxburst, 1);
+                        continue;
+                }
+
+                /*
+                 * If our queue is full, we have no choice but to drop some data.
+                 * The assumption is that HWFLOW or SWFLOW should have stopped
+                 * things way way before we got to this point.
+                 *
+                 * I decided that I wanted to ditch the oldest data first,
+                 * I hope thats okay with everyone? Yes? Good.
+                 */
+                while (qleft < 1) {
+                        jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
+                                "Queue full, dropping DATA:%x LSR:%x\n",
+                                ch->ch_rqueue[tail], ch->ch_equeue[tail]);
+
+                        ch->ch_r_tail = tail = (tail + 1) & RQUEUEMASK;
+                        ch->ch_err_overrun++;
+                        qleft++;
+                }
+
+                memcpy_fromio(ch->ch_rqueue + head, &ch->ch_neo_uart->txrxburst, 1);
+                ch->ch_equeue[head] = (u8) linestatus;
+
+                jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
+                                "DATA/LSR pair: %x %x\n", ch->ch_rqueue[head], ch->ch_equeue[head]);
+
+                /* Ditch any remaining linestatus value. */
+                linestatus = 0;
+
+                /* Add to and flip head if needed */
+                head = (head + 1) & RQUEUEMASK;
+
+                qleft--;
+                ch->ch_rxcount++;
+        }
+
+        /*
+         * Write new final heads to channel structure.
+         */
+        ch->ch_r_head = head & RQUEUEMASK;
+        ch->ch_e_head = head & EQUEUEMASK;
+        jsm_input(ch);
+}
+
+static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch)
+{
+        u16 head;
+        u16 tail;
+        int n;
+        int s;
+        int qlen;
+        u32 len_written = 0;
+
+        if (!ch)
+                return;
+
+        /* No data to write to the UART */
+        if (ch->ch_w_tail == ch->ch_w_head)
+                return;
+
+        /* If port is "stopped", don't send any data to the UART */
+        if ((ch->ch_flags & CH_STOP) || (ch->ch_flags & CH_BREAK_SENDING))
+                return;
+        /*
+         * If FIFOs are disabled. Send data directly to txrx register
+         */
+        if (!(ch->ch_flags & CH_FIFO_ENABLED)) {
+                u8 lsrbits = readb(&ch->ch_neo_uart->lsr);
+
+                ch->ch_cached_lsr |= lsrbits;
+                if (ch->ch_cached_lsr & UART_LSR_THRE) {
+                        ch->ch_cached_lsr &= ~(UART_LSR_THRE);
+
+                        writeb(ch->ch_wqueue[ch->ch_w_tail], &ch->ch_neo_uart->txrx);
+                        jsm_printk(WRITE, INFO, &ch->ch_bd->pci_dev,
+                                        "Tx data: %x\n", ch->ch_wqueue[ch->ch_w_head]);
+                        ch->ch_w_tail++;
+                        ch->ch_w_tail &= WQUEUEMASK;
+                        ch->ch_txcount++;
+                }
+                return;
+        }
+
+        /*
+         * We have to do it this way, because of the EXAR TXFIFO count bug.
+         */
+        if (!(ch->ch_flags & (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM)))
+                return;
+
+        n = UART_17158_TX_FIFOSIZE - ch->ch_t_tlevel;
+
+        /* cache head and tail of queue */
+        head = ch->ch_w_head & WQUEUEMASK;
+        tail = ch->ch_w_tail & WQUEUEMASK;
+        qlen = (head - tail) & WQUEUEMASK;
+
+        /* Find minimum of the FIFO space, versus queue length */
+        n = min(n, qlen);
+
+        while (n > 0) {
+
+                s = ((head >= tail) ? head : WQUEUESIZE) - tail;
+                s = min(s, n);
+
+                if (s <= 0)
+                        break;
+
+                memcpy_toio(&ch->ch_neo_uart->txrxburst, ch->ch_wqueue + tail, s);
+                /* Add and flip queue if needed */
+                tail = (tail + s) & WQUEUEMASK;
+                n -= s;
+                ch->ch_txcount += s;
+                len_written += s;
+        }
+
+        /* Update the final tail */
+        ch->ch_w_tail = tail & WQUEUEMASK;
+
+        if (len_written >= ch->ch_t_tlevel)
+                ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+
+        if (!jsm_tty_write(&ch->uart_port))
+                uart_write_wakeup(&ch->uart_port);
+}
+
+static void neo_parse_modem(struct jsm_channel *ch, u8 signals)
+{
+        u8 msignals = signals;
+
+        jsm_printk(MSIGS, INFO, &ch->ch_bd->pci_dev,
+                        "neo_parse_modem: port: %d msignals: %x\n", ch->ch_portnum, msignals);
+
+        /* Scrub off lower bits. They signify delta's, which I don't care about */
+        /* Keep DDCD and DDSR though */
+        msignals &= 0xf8;
+
+        if (msignals & UART_MSR_DDCD)
+                uart_handle_dcd_change(&ch->uart_port, msignals & UART_MSR_DCD);
+        if (msignals & UART_MSR_DDSR)
+                uart_handle_cts_change(&ch->uart_port, msignals & UART_MSR_CTS);
+        if (msignals & UART_MSR_DCD)
+                ch->ch_mistat |= UART_MSR_DCD;
+        else
+                ch->ch_mistat &= ~UART_MSR_DCD;
+
+        if (msignals & UART_MSR_DSR)
+                ch->ch_mistat |= UART_MSR_DSR;
+        else
+                ch->ch_mistat &= ~UART_MSR_DSR;
+
+        if (msignals & UART_MSR_RI)
+                ch->ch_mistat |= UART_MSR_RI;
+        else
+                ch->ch_mistat &= ~UART_MSR_RI;
+
+        if (msignals & UART_MSR_CTS)
+                ch->ch_mistat |= UART_MSR_CTS;
+        else
+                ch->ch_mistat &= ~UART_MSR_CTS;
+
+        jsm_printk(MSIGS, INFO, &ch->ch_bd->pci_dev,
+                        "Port: %d DTR: %d RTS: %d CTS: %d DSR: %d " "RI: %d CD: %d\n",
+                ch->ch_portnum,
+                !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_DTR),
+                !!((ch->ch_mistat | ch->ch_mostat) & UART_MCR_RTS),
+                !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_CTS),
+                !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DSR),
+                !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_RI),
+                !!((ch->ch_mistat | ch->ch_mostat) & UART_MSR_DCD));
+}
+
+/* Make the UART raise any of the output signals we want up */
+static void neo_assert_modem_signals(struct jsm_channel *ch)
+{
+        if (!ch)
+                return;
+
+        writeb(ch->ch_mostat, &ch->ch_neo_uart->mcr);
+
+        /* flush write operation */
+        neo_pci_posting_flush(ch->ch_bd);
+}
+
+/*
+ * Flush the WRITE FIFO on the Neo.
+ *
+ * NOTE: Channel lock MUST be held before calling this function!
+ */
+static void neo_flush_uart_write(struct jsm_channel *ch)
+{
+        u8 tmp = 0;
+        int i = 0;
+
+        if (!ch)
+                return;
+
+        writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_XMIT), &ch->ch_neo_uart->isr_fcr);
+
+        for (i = 0; i < 10; i++) {
+
+                /* Check to see if the UART feels it completely flushed the FIFO. */
+                tmp = readb(&ch->ch_neo_uart->isr_fcr);
+                if (tmp & 4) {
+                        jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev,
+                                        "Still flushing TX UART... i: %d\n", i);
+                        udelay(10);
+                }
+                else
+                        break;
+        }
+
+        ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+}
+
+
+/*
+ * Flush the READ FIFO on the Neo.
+ *
+ * NOTE: Channel lock MUST be held before calling this function!
+ */
+static void neo_flush_uart_read(struct jsm_channel *ch)
+{
+        u8 tmp = 0;
+        int i = 0;
+
+        if (!ch)
+                return;
+
+        writeb((UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR), &ch->ch_neo_uart->isr_fcr);
+
+        for (i = 0; i < 10; i++) {
+
+                /* Check to see if the UART feels it completely flushed the FIFO. */
+                tmp = readb(&ch->ch_neo_uart->isr_fcr);
+                if (tmp & 2) {
+                        jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev,
+                                        "Still flushing RX UART... i: %d\n", i);
+                        udelay(10);
+                }
+                else
+                        break;
+        }
+}
+
+/*
+ * No locks are assumed to be held when calling this function.
+ */
+static void neo_clear_break(struct jsm_channel *ch, int force)
+{
+        unsigned long lock_flags;
+
+        spin_lock_irqsave(&ch->ch_lock, lock_flags);
+
+        /* Turn break off, and unset some variables */
+        if (ch->ch_flags & CH_BREAK_SENDING) {
+                u8 temp = readb(&ch->ch_neo_uart->lcr);
+                writeb((temp & ~UART_LCR_SBC), &ch->ch_neo_uart->lcr);
+
+                ch->ch_flags &= ~(CH_BREAK_SENDING);
+                jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev,
+                                "clear break Finishing UART_LCR_SBC! finished: %lx\n", jiffies);
+
+                /* flush write operation */
+                neo_pci_posting_flush(ch->ch_bd);
+        }
+        spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+}
+
+/*
+ * Parse the ISR register.
+ */
+static inline void neo_parse_isr(struct jsm_board *brd, u32 port)
+{
+        struct jsm_channel *ch;
+        u8 isr;
+        u8 cause;
+        unsigned long lock_flags;
+
+        if (!brd)
+                return;
+
+        if (port > brd->maxports)
+                return;
+
+        ch = brd->channels[port];
+        if (!ch)
+                return;
+
+        /* Here we try to figure out what caused the interrupt to happen */
+        while (1) {
+
+                isr = readb(&ch->ch_neo_uart->isr_fcr);
+
+                /* Bail if no pending interrupt */
+                if (isr & UART_IIR_NO_INT)
+                        break;
+
+                /*
+                 * Yank off the upper 2 bits, which just show that the FIFO's are enabled.
+                 */
+                isr &= ~(UART_17158_IIR_FIFO_ENABLED);
+
+                jsm_printk(INTR, INFO, &ch->ch_bd->pci_dev,
+                                "%s:%d isr: %x\n", __FILE__, __LINE__, isr);
+
+                if (isr & (UART_17158_IIR_RDI_TIMEOUT | UART_IIR_RDI)) {
+                        /* Read data from uart -> queue */
+                        neo_copy_data_from_uart_to_queue(ch);
+
+                        /* Call our tty layer to enforce queue flow control if needed. */
+                        spin_lock_irqsave(&ch->ch_lock, lock_flags);
+                        jsm_check_queue_flow_control(ch);
+                        spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                }
+
+                if (isr & UART_IIR_THRI) {
+                        /* Transfer data (if any) from Write Queue -> UART. */
+                        spin_lock_irqsave(&ch->ch_lock, lock_flags);
+                        ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+                        spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                        neo_copy_data_from_queue_to_uart(ch);
+                }
+
+                if (isr & UART_17158_IIR_XONXOFF) {
+                        cause = readb(&ch->ch_neo_uart->xoffchar1);
+
+                        jsm_printk(INTR, INFO, &ch->ch_bd->pci_dev,
+                                        "Port %d. Got ISR_XONXOFF: cause:%x\n", port, cause);
+
+                        /*
+                         * Since the UART detected either an XON or
+                         * XOFF match, we need to figure out which
+                         * one it was, so we can suspend or resume data flow.
+                         */
+                        spin_lock_irqsave(&ch->ch_lock, lock_flags);
+                        if (cause == UART_17158_XON_DETECT) {
+                                /* Is output stopped right now, if so, resume it */
+                                if (brd->channels[port]->ch_flags & CH_STOP) {
+                                        ch->ch_flags &= ~(CH_STOP);
+                                }
+                                jsm_printk(INTR, INFO, &ch->ch_bd->pci_dev,
+                                                "Port %d. XON detected in incoming data\n", port);
+                        }
+                        else if (cause == UART_17158_XOFF_DETECT) {
+                                if (!(brd->channels[port]->ch_flags & CH_STOP)) {
+                                        ch->ch_flags |= CH_STOP;
+                                        jsm_printk(INTR, INFO, &ch->ch_bd->pci_dev,
+                                                        "Setting CH_STOP\n");
+                                }
+                                jsm_printk(INTR, INFO, &ch->ch_bd->pci_dev,
+                                                "Port: %d. XOFF detected in incoming data\n", port);
+                        }
+                        spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                }
+
+                if (isr & UART_17158_IIR_HWFLOW_STATE_CHANGE) {
+                        /*
+                         * If we get here, this means the hardware is doing auto flow control.
+                         * Check to see whether RTS/DTR or CTS/DSR caused this interrupt.
+                         */
+                        cause = readb(&ch->ch_neo_uart->mcr);
+
+                        /* Which pin is doing auto flow? RTS or DTR? */
+                        spin_lock_irqsave(&ch->ch_lock, lock_flags);
+                        if ((cause & 0x4) == 0) {
+                                if (cause & UART_MCR_RTS)
+                                        ch->ch_mostat |= UART_MCR_RTS;
+                                else
+                                        ch->ch_mostat &= ~(UART_MCR_RTS);
+                        } else {
+                                if (cause & UART_MCR_DTR)
+                                        ch->ch_mostat |= UART_MCR_DTR;
+                                else
+                                        ch->ch_mostat &= ~(UART_MCR_DTR);
+                        }
+                        spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                }
+
+                /* Parse any modem signal changes */
+                jsm_printk(INTR, INFO, &ch->ch_bd->pci_dev,
+                                "MOD_STAT: sending to parse_modem_sigs\n");
+                neo_parse_modem(ch, readb(&ch->ch_neo_uart->msr));
+        }
+}
+
+static inline void neo_parse_lsr(struct jsm_board *brd, u32 port)
+{
+        struct jsm_channel *ch;
+        int linestatus;
+        unsigned long lock_flags;
+
+        if (!brd)
+                return;
+
+        if (port > brd->maxports)
+                return;
+
+        ch = brd->channels[port];
+        if (!ch)
+                return;
+
+        linestatus = readb(&ch->ch_neo_uart->lsr);
+
+        jsm_printk(INTR, INFO, &ch->ch_bd->pci_dev,
+                        "%s:%d port: %d linestatus: %x\n", __FILE__, __LINE__, port, linestatus);
+
+        ch->ch_cached_lsr |= linestatus;
+
+        if (ch->ch_cached_lsr & UART_LSR_DR) {
+                /* Read data from uart -> queue */
+                neo_copy_data_from_uart_to_queue(ch);
+                spin_lock_irqsave(&ch->ch_lock, lock_flags);
+                jsm_check_queue_flow_control(ch);
+                spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+        }
+
+        /*
+         * This is a special flag. It indicates that at least 1
+         * RX error (parity, framing, or break) has happened.
+         * Mark this in our struct, which will tell me that I have
+         *to do the special RX+LSR read for this FIFO load.
+         */
+        if (linestatus & UART_17158_RX_FIFO_DATA_ERROR)
+                jsm_printk(INTR, DEBUG, &ch->ch_bd->pci_dev,
+                        "%s:%d Port: %d Got an RX error, need to parse LSR\n",
+                        __FILE__, __LINE__, port);
+
+        /*
+         * The next 3 tests should *NOT* happen, as the above test
+         * should encapsulate all 3... At least, thats what Exar says.
+         */
+
+        if (linestatus & UART_LSR_PE) {
+                ch->ch_err_parity++;
+                jsm_printk(INTR, DEBUG, &ch->ch_bd->pci_dev,
+                        "%s:%d Port: %d. PAR ERR!\n", __FILE__, __LINE__, port);
+        }
+
+        if (linestatus & UART_LSR_FE) {
+                ch->ch_err_frame++;
+                jsm_printk(INTR, DEBUG, &ch->ch_bd->pci_dev,
+                        "%s:%d Port: %d. FRM ERR!\n", __FILE__, __LINE__, port);
+        }
+
+        if (linestatus & UART_LSR_BI) {
+                ch->ch_err_break++;
+                jsm_printk(INTR, DEBUG, &ch->ch_bd->pci_dev,
+                        "%s:%d Port: %d. BRK INTR!\n", __FILE__, __LINE__, port);
+        }
+
+        if (linestatus & UART_LSR_OE) {
+                /*
+                 * Rx Oruns. Exar says that an orun will NOT corrupt
+                 * the FIFO. It will just replace the holding register
+                 * with this new data byte. So basically just ignore this.
+                 * Probably we should eventually have an orun stat in our driver...
+                 */
+                ch->ch_err_overrun++;
+                jsm_printk(INTR, DEBUG, &ch->ch_bd->pci_dev,
+                        "%s:%d Port: %d. Rx Overrun!\n", __FILE__, __LINE__, port);
+        }
+
+        if (linestatus & UART_LSR_THRE) {
+                spin_lock_irqsave(&ch->ch_lock, lock_flags);
+                ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+                spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+
+                /* Transfer data (if any) from Write Queue -> UART. */
+                neo_copy_data_from_queue_to_uart(ch);
+        }
+        else if (linestatus & UART_17158_TX_AND_FIFO_CLR) {
+                spin_lock_irqsave(&ch->ch_lock, lock_flags);
+                ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+                spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+
+                /* Transfer data (if any) from Write Queue -> UART. */
+                neo_copy_data_from_queue_to_uart(ch);
+        }
+}
+
+/*
+ * neo_param()
+ * Send any/all changes to the line to the UART.
+ */
+static void neo_param(struct jsm_channel *ch)
+{
+        u8 lcr = 0;
+        u8 uart_lcr, ier;
+        u32 baud;
+        int quot;
+        struct jsm_board *bd;
+
+        bd = ch->ch_bd;
+        if (!bd)
+                return;
+
+        /*
+         * If baud rate is zero, flush queues, and set mval to drop DTR.
+         */
+        if ((ch->ch_c_cflag & (CBAUD)) == 0) {
+                ch->ch_r_head = ch->ch_r_tail = 0;
+                ch->ch_e_head = ch->ch_e_tail = 0;
+                ch->ch_w_head = ch->ch_w_tail = 0;
+
+                neo_flush_uart_write(ch);
+                neo_flush_uart_read(ch);
+
+                ch->ch_flags |= (CH_BAUD0);
+                ch->ch_mostat &= ~(UART_MCR_RTS | UART_MCR_DTR);
+                neo_assert_modem_signals(ch);
+                return;
+
+        } else {
+                int i;
+                unsigned int cflag;
+                static struct {
+                        unsigned int rate;
+                        unsigned int cflag;
+                } baud_rates[] = {
+                        { 921600, B921600 },
+                        { 460800, B460800 },
+                        { 230400, B230400 },
+                        { 115200, B115200 },
+                        {  57600, B57600  },
+                        {  38400, B38400  },
+                        {  19200, B19200  },
+                        {   9600, B9600   },
+                        {   4800, B4800   },
+                        {   2400, B2400   },
+                        {   1200, B1200   },
+                        {    600, B600    },
+                        {    300, B300    },
+                        {    200, B200    },
+                        {    150, B150    },
+                        {    134, B134    },
+                        {    110, B110    },
+                        {     75, B75     },
+                        {     50, B50     },
+                };
+
+                cflag = C_BAUD(ch->uart_port.state->port.tty);
+                baud = 9600;
+                for (i = 0; i < ARRAY_SIZE(baud_rates); i++) {
+                        if (baud_rates[i].cflag == cflag) {
+                                baud = baud_rates[i].rate;
+                                break;
+                        }
+                }
+
+                if (ch->ch_flags & CH_BAUD0)
+                        ch->ch_flags &= ~(CH_BAUD0);
+        }
+
+        if (ch->ch_c_cflag & PARENB)
+                lcr |= UART_LCR_PARITY;
+
+        if (!(ch->ch_c_cflag & PARODD))
+                lcr |= UART_LCR_EPAR;
+
+        /*
+         * Not all platforms support mark/space parity,
+         * so this will hide behind an ifdef.
+         */
+#ifdef CMSPAR
+        if (ch->ch_c_cflag & CMSPAR)
+                lcr |= UART_LCR_SPAR;
+#endif
+
+        if (ch->ch_c_cflag & CSTOPB)
+                lcr |= UART_LCR_STOP;
+
+        switch (ch->ch_c_cflag & CSIZE) {
+                case CS5:
+                        lcr |= UART_LCR_WLEN5;
+                        break;
+                case CS6:
+                        lcr |= UART_LCR_WLEN6;
+                        break;
+                case CS7:
+                        lcr |= UART_LCR_WLEN7;
+                        break;
+                case CS8:
+                default:
+                        lcr |= UART_LCR_WLEN8;
+                break;
+        }
+
+        ier = readb(&ch->ch_neo_uart->ier);
+        uart_lcr = readb(&ch->ch_neo_uart->lcr);
+
+        if (baud == 0)
+                baud = 9600;
+
+        quot = ch->ch_bd->bd_dividend / baud;
+
+        if (quot != 0) {
+                writeb(UART_LCR_DLAB, &ch->ch_neo_uart->lcr);
+                writeb((quot & 0xff), &ch->ch_neo_uart->txrx);
+                writeb((quot >> 8), &ch->ch_neo_uart->ier);
+                writeb(lcr, &ch->ch_neo_uart->lcr);
+        }
+
+        if (uart_lcr != lcr)
+                writeb(lcr, &ch->ch_neo_uart->lcr);
+
+        if (ch->ch_c_cflag & CREAD)
+                ier |= (UART_IER_RDI | UART_IER_RLSI);
+
+        ier |= (UART_IER_THRI | UART_IER_MSI);
+
+        writeb(ier, &ch->ch_neo_uart->ier);
+
+        /* Set new start/stop chars */
+        neo_set_new_start_stop_chars(ch);
+
+        if (ch->ch_c_cflag & CRTSCTS)
+                neo_set_cts_flow_control(ch);
+        else if (ch->ch_c_iflag & IXON) {
+                /* If start/stop is set to disable, then we should disable flow control */
+                if ((ch->ch_startc == __DISABLED_CHAR) || (ch->ch_stopc == __DISABLED_CHAR))
+                        neo_set_no_output_flow_control(ch);
+                else
+                        neo_set_ixon_flow_control(ch);
+        }
+        else
+                neo_set_no_output_flow_control(ch);
+
+        if (ch->ch_c_cflag & CRTSCTS)
+                neo_set_rts_flow_control(ch);
+        else if (ch->ch_c_iflag & IXOFF) {
+                /* If start/stop is set to disable, then we should disable flow control */
+                if ((ch->ch_startc == __DISABLED_CHAR) || (ch->ch_stopc == __DISABLED_CHAR))
+                        neo_set_no_input_flow_control(ch);
+                else
+                        neo_set_ixoff_flow_control(ch);
+        }
+        else
+                neo_set_no_input_flow_control(ch);
+        /*
+         * Adjust the RX FIFO Trigger level if baud is less than 9600.
+         * Not exactly elegant, but this is needed because of the Exar chip's
+         * delay on firing off the RX FIFO interrupt on slower baud rates.
+         */
+        if (baud < 9600) {
+                writeb(1, &ch->ch_neo_uart->rfifo);
+                ch->ch_r_tlevel = 1;
+        }
+
+        neo_assert_modem_signals(ch);
+
+        /* Get current status of the modem signals now */
+        neo_parse_modem(ch, readb(&ch->ch_neo_uart->msr));
+        return;
+}
+
+/*
+ * jsm_neo_intr()
+ *
+ * Neo specific interrupt handler.
+ */
+static irqreturn_t neo_intr(int irq, void *voidbrd)
+{
+        struct jsm_board *brd = voidbrd;
+        struct jsm_channel *ch;
+        int port = 0;
+        int type = 0;
+        int current_port;
+        u32 tmp;
+        u32 uart_poll;
+        unsigned long lock_flags;
+        unsigned long lock_flags2;
+        int outofloop_count = 0;
+
+        /* Lock out the slow poller from running on this board. */
+        spin_lock_irqsave(&brd->bd_intr_lock, lock_flags);
+
+        /*
+         * Read in "extended" IRQ information from the 32bit Neo register.
+         * Bits 0-7: What port triggered the interrupt.
+         * Bits 8-31: Each 3bits indicate what type of interrupt occurred.
+         */
+        uart_poll = readl(brd->re_map_membase + UART_17158_POLL_ADDR_OFFSET);
+
+        jsm_printk(INTR, INFO, &brd->pci_dev,
+                "%s:%d uart_poll: %x\n", __FILE__, __LINE__, uart_poll);
+
+        if (!uart_poll) {
+                jsm_printk(INTR, INFO, &brd->pci_dev,
+                        "Kernel interrupted to me, but no pending interrupts...\n");
+                spin_unlock_irqrestore(&brd->bd_intr_lock, lock_flags);
+                return IRQ_NONE;
+        }
+
+        /* At this point, we have at least SOMETHING to service, dig further... */
+
+        current_port = 0;
+
+        /* Loop on each port */
+        while (((uart_poll & 0xff) != 0) && (outofloop_count < 0xff)){
+
+                tmp = uart_poll;
+                outofloop_count++;
+
+                /* Check current port to see if it has interrupt pending */
+                if ((tmp & jsm_offset_table[current_port]) != 0) {
+                        port = current_port;
+                        type = tmp >> (8 + (port * 3));
+                        type &= 0x7;
+                } else {
+                        current_port++;
+                        continue;
+                }
+
+                jsm_printk(INTR, INFO, &brd->pci_dev,
+                "%s:%d port: %x type: %x\n", __FILE__, __LINE__, port, type);
+
+                /* Remove this port + type from uart_poll */
+                uart_poll &= ~(jsm_offset_table[port]);
+
+                if (!type) {
+                        /* If no type, just ignore it, and move onto next port */
+                        jsm_printk(INTR, ERR, &brd->pci_dev,
+                                "Interrupt with no type! port: %d\n", port);
+                        continue;
+                }
+
+                /* Switch on type of interrupt we have */
+                switch (type) {
+
+                case UART_17158_RXRDY_TIMEOUT:
+                        /*
+                         * RXRDY Time-out is cleared by reading data in the
+                        * RX FIFO until it falls below the trigger level.
+                         */
+
+                        /* Verify the port is in range. */
+                        if (port > brd->nasync)
+                                continue;
+
+                        ch = brd->channels[port];
+                        neo_copy_data_from_uart_to_queue(ch);
+
+                        /* Call our tty layer to enforce queue flow control if needed. */
+                        spin_lock_irqsave(&ch->ch_lock, lock_flags2);
+                        jsm_check_queue_flow_control(ch);
+                        spin_unlock_irqrestore(&ch->ch_lock, lock_flags2);
+
+                        continue;
+
+                case UART_17158_RX_LINE_STATUS:
+                        /*
+                         * RXRDY and RX LINE Status (logic OR of LSR[4:1])
+                         */
+                        neo_parse_lsr(brd, port);
+                        continue;
+
+                case UART_17158_TXRDY:
+                        /*
+                         * TXRDY interrupt clears after reading ISR register for the UART channel.
+                         */
+
+                        /*
+                         * Yes, this is odd...
+                         * Why would I check EVERY possibility of type of
+                         * interrupt, when we know its TXRDY???
+                         * Becuz for some reason, even tho we got triggered for TXRDY,
+                         * it seems to be occasionally wrong. Instead of TX, which
+                         * it should be, I was getting things like RXDY too. Weird.
+                         */
+                        neo_parse_isr(brd, port);
+                        continue;
+
+                case UART_17158_MSR:
+                        /*
+                         * MSR or flow control was seen.
+                         */
+                        neo_parse_isr(brd, port);
+                        continue;
+
+                default:
+                        /*
+                         * The UART triggered us with a bogus interrupt type.
+                         * It appears the Exar chip, when REALLY bogged down, will throw
+                         * these once and awhile.
+                         * Its harmless, just ignore it and move on.
+                         */
+                        jsm_printk(INTR, ERR, &brd->pci_dev,
+                                "%s:%d Unknown Interrupt type: %x\n", __FILE__, __LINE__, type);
+                        continue;
+                }
+        }
+
+        spin_unlock_irqrestore(&brd->bd_intr_lock, lock_flags);
+
+        jsm_printk(INTR, INFO, &brd->pci_dev, "finish.\n");
+        return IRQ_HANDLED;
+}
+
+/*
+ * Neo specific way of turning off the receiver.
+ * Used as a way to enforce queue flow control when in
+ * hardware flow control mode.
+ */
+static void neo_disable_receiver(struct jsm_channel *ch)
+{
+        u8 tmp = readb(&ch->ch_neo_uart->ier);
+        tmp &= ~(UART_IER_RDI);
+        writeb(tmp, &ch->ch_neo_uart->ier);
+
+        /* flush write operation */
+        neo_pci_posting_flush(ch->ch_bd);
+}
+
+
+/*
+ * Neo specific way of turning on the receiver.
+ * Used as a way to un-enforce queue flow control when in
+ * hardware flow control mode.
+ */
+static void neo_enable_receiver(struct jsm_channel *ch)
+{
+        u8 tmp = readb(&ch->ch_neo_uart->ier);
+        tmp |= (UART_IER_RDI);
+        writeb(tmp, &ch->ch_neo_uart->ier);
+
+        /* flush write operation */
+        neo_pci_posting_flush(ch->ch_bd);
+}
+
+static void neo_send_start_character(struct jsm_channel *ch)
+{
+        if (!ch)
+                return;
+
+        if (ch->ch_startc != __DISABLED_CHAR) {
+                ch->ch_xon_sends++;
+                writeb(ch->ch_startc, &ch->ch_neo_uart->txrx);
+
+                /* flush write operation */
+                neo_pci_posting_flush(ch->ch_bd);
+        }
+}
+
+static void neo_send_stop_character(struct jsm_channel *ch)
+{
+        if (!ch)
+                return;
+
+        if (ch->ch_stopc != __DISABLED_CHAR) {
+                ch->ch_xoff_sends++;
+                writeb(ch->ch_stopc, &ch->ch_neo_uart->txrx);
+
+                /* flush write operation */
+                neo_pci_posting_flush(ch->ch_bd);
+        }
+}
+
+/*
+ * neo_uart_init
+ */
+static void neo_uart_init(struct jsm_channel *ch)
+{
+        writeb(0, &ch->ch_neo_uart->ier);
+        writeb(0, &ch->ch_neo_uart->efr);
+        writeb(UART_EFR_ECB, &ch->ch_neo_uart->efr);
+
+        /* Clear out UART and FIFO */
+        readb(&ch->ch_neo_uart->txrx);
+        writeb((UART_FCR_ENABLE_FIFO|UART_FCR_CLEAR_RCVR|UART_FCR_CLEAR_XMIT), &ch->ch_neo_uart->isr_fcr);
+        readb(&ch->ch_neo_uart->lsr);
+        readb(&ch->ch_neo_uart->msr);
+
+        ch->ch_flags |= CH_FIFO_ENABLED;
+
+        /* Assert any signals we want up */
+        writeb(ch->ch_mostat, &ch->ch_neo_uart->mcr);
+}
+
+/*
+ * Make the UART completely turn off.
+ */
+static void neo_uart_off(struct jsm_channel *ch)
+{
+        /* Turn off UART enhanced bits */
+        writeb(0, &ch->ch_neo_uart->efr);
+
+        /* Stop all interrupts from occurring. */
+        writeb(0, &ch->ch_neo_uart->ier);
+}
+
+static u32 neo_get_uart_bytes_left(struct jsm_channel *ch)
+{
+        u8 left = 0;
+        u8 lsr = readb(&ch->ch_neo_uart->lsr);
+
+        /* We must cache the LSR as some of the bits get reset once read... */
+        ch->ch_cached_lsr |= lsr;
+
+        /* Determine whether the Transmitter is empty or not */
+        if (!(lsr & UART_LSR_TEMT))
+                left = 1;
+        else {
+                ch->ch_flags |= (CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
+                left = 0;
+        }
+
+        return left;
+}
+
+/* Channel lock MUST be held by the calling function! */
+static void neo_send_break(struct jsm_channel *ch)
+{
+        /*
+         * Set the time we should stop sending the break.
+         * If we are already sending a break, toss away the existing
+         * time to stop, and use this new value instead.
+         */
+
+        /* Tell the UART to start sending the break */
+        if (!(ch->ch_flags & CH_BREAK_SENDING)) {
+                u8 temp = readb(&ch->ch_neo_uart->lcr);
+                writeb((temp | UART_LCR_SBC), &ch->ch_neo_uart->lcr);
+                ch->ch_flags |= (CH_BREAK_SENDING);
+
+                /* flush write operation */
+                neo_pci_posting_flush(ch->ch_bd);
+        }
+}
+
+/*
+ * neo_send_immediate_char.
+ *
+ * Sends a specific character as soon as possible to the UART,
+ * jumping over any bytes that might be in the write queue.
+ *
+ * The channel lock MUST be held by the calling function.
+ */
+static void neo_send_immediate_char(struct jsm_channel *ch, unsigned char c)
+{
+        if (!ch)
+                return;
+
+        writeb(c, &ch->ch_neo_uart->txrx);
+
+        /* flush write operation */
+        neo_pci_posting_flush(ch->ch_bd);
+}
+
+struct board_ops jsm_neo_ops = {
+        .intr                           = neo_intr,
+        .uart_init                      = neo_uart_init,
+        .uart_off                       = neo_uart_off,
+        .param                          = neo_param,
+        .assert_modem_signals           = neo_assert_modem_signals,
+        .flush_uart_write               = neo_flush_uart_write,
+        .flush_uart_read                = neo_flush_uart_read,
+        .disable_receiver               = neo_disable_receiver,
+        .enable_receiver                = neo_enable_receiver,
+        .send_break                     = neo_send_break,
+        .clear_break                    = neo_clear_break,
+        .send_start_character           = neo_send_start_character,
+        .send_stop_character            = neo_send_stop_character,
+        .copy_data_from_queue_to_uart   = neo_copy_data_from_queue_to_uart,
+        .get_uart_bytes_left            = neo_get_uart_bytes_left,
+        .send_immediate_char            = neo_send_immediate_char
+};
diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
new file mode 100644
index 000000000000..7a4a914ecff0
--- /dev/null
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -0,0 +1,910 @@
+/************************************************************************
+ * Copyright 2003 Digi International (www.digi.com)
+ *
+ * Copyright (C) 2004 IBM Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 * Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ *
+ * Contact Information:
+ * Scott H Kilau <Scott_Kilau@digi.com>
+ * Ananda Venkatarman <mansarov@us.ibm.com>
+ * Modifications:
+ * 01/19/06:    changed jsm_input routine to use the dynamically allocated
+ *              tty_buffer changes. Contributors: Scott Kilau and Ananda V.
+ ***********************************************************************/
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_reg.h>
+#include <linux/delay.h>        /* For udelay */
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+#include "jsm.h"
+
+static DECLARE_BITMAP(linemap, MAXLINES);
+
+static void jsm_carrier(struct jsm_channel *ch);
+
+static inline int jsm_get_mstat(struct jsm_channel *ch)
+{
+        unsigned char mstat;
+        unsigned result;
+
+        jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n");
+
+        mstat = (ch->ch_mostat | ch->ch_mistat);
+
+        result = 0;
+
+        if (mstat & UART_MCR_DTR)
+                result |= TIOCM_DTR;
+        if (mstat & UART_MCR_RTS)
+                result |= TIOCM_RTS;
+        if (mstat & UART_MSR_CTS)
+                result |= TIOCM_CTS;
+        if (mstat & UART_MSR_DSR)
+                result |= TIOCM_DSR;
+        if (mstat & UART_MSR_RI)
+                result |= TIOCM_RI;
+        if (mstat & UART_MSR_DCD)
+                result |= TIOCM_CD;
+
+        jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
+        return result;
+}
+
+static unsigned int jsm_tty_tx_empty(struct uart_port *port)
+{
+        return TIOCSER_TEMT;
+}
+
+/*
+ * Return modem signals to ld.
+ */
+static unsigned int jsm_tty_get_mctrl(struct uart_port *port)
+{
+        int result;
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
+
+        result = jsm_get_mstat(channel);
+
+        if (result < 0)
+                return -ENXIO;
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
+
+        return result;
+}
+
+/*
+ * jsm_set_modem_info()
+ *
+ * Set modem signals, called by ld.
+ */
+static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
+
+        if (mctrl & TIOCM_RTS)
+                channel->ch_mostat |= UART_MCR_RTS;
+        else
+                channel->ch_mostat &= ~UART_MCR_RTS;
+
+        if (mctrl & TIOCM_DTR)
+                channel->ch_mostat |= UART_MCR_DTR;
+        else
+                channel->ch_mostat &= ~UART_MCR_DTR;
+
+        channel->ch_bd->bd_ops->assert_modem_signals(channel);
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
+        udelay(10);
+}
+
+static void jsm_tty_start_tx(struct uart_port *port)
+{
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
+
+        channel->ch_flags &= ~(CH_STOP);
+        jsm_tty_write(port);
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
+}
+
+static void jsm_tty_stop_tx(struct uart_port *port)
+{
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n");
+
+        channel->ch_flags |= (CH_STOP);
+
+        jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n");
+}
+
+static void jsm_tty_send_xchar(struct uart_port *port, char ch)
+{
+        unsigned long lock_flags;
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+        struct ktermios *termios;
+
+        spin_lock_irqsave(&port->lock, lock_flags);
+        termios = port->state->port.tty->termios;
+        if (ch == termios->c_cc[VSTART])
+                channel->ch_bd->bd_ops->send_start_character(channel);
+
+        if (ch == termios->c_cc[VSTOP])
+                channel->ch_bd->bd_ops->send_stop_character(channel);
+        spin_unlock_irqrestore(&port->lock, lock_flags);
+}
+
+static void jsm_tty_stop_rx(struct uart_port *port)
+{
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        channel->ch_bd->bd_ops->disable_receiver(channel);
+}
+
+static void jsm_tty_enable_ms(struct uart_port *port)
+{
+        /* Nothing needed */
+}
+
+static void jsm_tty_break(struct uart_port *port, int break_state)
+{
+        unsigned long lock_flags;
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        spin_lock_irqsave(&port->lock, lock_flags);
+        if (break_state == -1)
+                channel->ch_bd->bd_ops->send_break(channel);
+        else
+                channel->ch_bd->bd_ops->clear_break(channel, 0);
+
+        spin_unlock_irqrestore(&port->lock, lock_flags);
+}
+
+static int jsm_tty_open(struct uart_port *port)
+{
+        struct jsm_board *brd;
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+        struct ktermios *termios;
+
+        /* Get board pointer from our array of majors we have allocated */
+        brd = channel->ch_bd;
+
+        /*
+         * Allocate channel buffers for read/write/error.
+         * Set flag, so we don't get trounced on.
+         */
+        channel->ch_flags |= (CH_OPENING);
+
+        /* Drop locks, as malloc with GFP_KERNEL can sleep */
+
+        if (!channel->ch_rqueue) {
+                channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL);
+                if (!channel->ch_rqueue) {
+                        jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
+                                "unable to allocate read queue buf");
+                        return -ENOMEM;
+                }
+        }
+        if (!channel->ch_equeue) {
+                channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL);
+                if (!channel->ch_equeue) {
+                        jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
+                                "unable to allocate error queue buf");
+                        return -ENOMEM;
+                }
+        }
+        if (!channel->ch_wqueue) {
+                channel->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL);
+                if (!channel->ch_wqueue) {
+                        jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
+                                "unable to allocate write queue buf");
+                        return -ENOMEM;
+                }
+        }
+
+        channel->ch_flags &= ~(CH_OPENING);
+        /*
+         * Initialize if neither terminal is open.
+         */
+        jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev,
+                "jsm_open: initializing channel in open...\n");
+
+        /*
+         * Flush input queues.
+         */
+        channel->ch_r_head = channel->ch_r_tail = 0;
+        channel->ch_e_head = channel->ch_e_tail = 0;
+        channel->ch_w_head = channel->ch_w_tail = 0;
+
+        brd->bd_ops->flush_uart_write(channel);
+        brd->bd_ops->flush_uart_read(channel);
+
+        channel->ch_flags = 0;
+        channel->ch_cached_lsr = 0;
+        channel->ch_stops_sent = 0;
+
+        termios = port->state->port.tty->termios;
+        channel->ch_c_cflag     = termios->c_cflag;
+        channel->ch_c_iflag     = termios->c_iflag;
+        channel->ch_c_oflag     = termios->c_oflag;
+        channel->ch_c_lflag     = termios->c_lflag;
+        channel->ch_startc      = termios->c_cc[VSTART];
+        channel->ch_stopc       = termios->c_cc[VSTOP];
+
+        /* Tell UART to init itself */
+        brd->bd_ops->uart_init(channel);
+
+        /*
+         * Run param in case we changed anything
+         */
+        brd->bd_ops->param(channel);
+
+        jsm_carrier(channel);
+
+        channel->ch_open_count++;
+
+        jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n");
+        return 0;
+}
+
+static void jsm_tty_close(struct uart_port *port)
+{
+        struct jsm_board *bd;
+        struct ktermios *ts;
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n");
+
+        bd = channel->ch_bd;
+        ts = port->state->port.tty->termios;
+
+        channel->ch_flags &= ~(CH_STOPI);
+
+        channel->ch_open_count--;
+
+        /*
+         * If we have HUPCL set, lower DTR and RTS
+         */
+        if (channel->ch_c_cflag & HUPCL) {
+                jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev,
+                        "Close. HUPCL set, dropping DTR/RTS\n");
+
+                /* Drop RTS/DTR */
+                channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
+                bd->bd_ops->assert_modem_signals(channel);
+        }
+
+        /* Turn off UART interrupts for this port */
+        channel->ch_bd->bd_ops->uart_off(channel);
+
+        jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n");
+}
+
+static void jsm_tty_set_termios(struct uart_port *port,
+                                 struct ktermios *termios,
+                                 struct ktermios *old_termios)
+{
+        unsigned long lock_flags;
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        spin_lock_irqsave(&port->lock, lock_flags);
+        channel->ch_c_cflag     = termios->c_cflag;
+        channel->ch_c_iflag     = termios->c_iflag;
+        channel->ch_c_oflag     = termios->c_oflag;
+        channel->ch_c_lflag     = termios->c_lflag;
+        channel->ch_startc      = termios->c_cc[VSTART];
+        channel->ch_stopc       = termios->c_cc[VSTOP];
+
+        channel->ch_bd->bd_ops->param(channel);
+        jsm_carrier(channel);
+        spin_unlock_irqrestore(&port->lock, lock_flags);
+}
+
+static const char *jsm_tty_type(struct uart_port *port)
+{
+        return "jsm";
+}
+
+static void jsm_tty_release_port(struct uart_port *port)
+{
+}
+
+static int jsm_tty_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void jsm_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_JSM;
+}
+
+static struct uart_ops jsm_ops = {
+        .tx_empty       = jsm_tty_tx_empty,
+        .set_mctrl      = jsm_tty_set_mctrl,
+        .get_mctrl      = jsm_tty_get_mctrl,
+        .stop_tx        = jsm_tty_stop_tx,
+        .start_tx       = jsm_tty_start_tx,
+        .send_xchar     = jsm_tty_send_xchar,
+        .stop_rx        = jsm_tty_stop_rx,
+        .enable_ms      = jsm_tty_enable_ms,
+        .break_ctl      = jsm_tty_break,
+        .startup        = jsm_tty_open,
+        .shutdown       = jsm_tty_close,
+        .set_termios    = jsm_tty_set_termios,
+        .type           = jsm_tty_type,
+        .release_port   = jsm_tty_release_port,
+        .request_port   = jsm_tty_request_port,
+        .config_port    = jsm_config_port,
+};
+
+/*
+ * jsm_tty_init()
+ *
+ * Init the tty subsystem.  Called once per board after board has been
+ * downloaded and init'ed.
+ */
+int __devinit jsm_tty_init(struct jsm_board *brd)
+{
+        int i;
+        void __iomem *vaddr;
+        struct jsm_channel *ch;
+
+        if (!brd)
+                return -ENXIO;
+
+        jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
+
+        /*
+         * Initialize board structure elements.
+         */
+
+        brd->nasync = brd->maxports;
+
+        /*
+         * Allocate channel memory that might not have been allocated
+         * when the driver was first loaded.
+         */
+        for (i = 0; i < brd->nasync; i++) {
+                if (!brd->channels[i]) {
+
+                        /*
+                         * Okay to malloc with GFP_KERNEL, we are not at
+                         * interrupt context, and there are no locks held.
+                         */
+                        brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL);
+                        if (!brd->channels[i]) {
+                                jsm_printk(CORE, ERR, &brd->pci_dev,
+                                        "%s:%d Unable to allocate memory for channel struct\n",
+                                                         __FILE__, __LINE__);
+                        }
+                }
+        }
+
+        ch = brd->channels[0];
+        vaddr = brd->re_map_membase;
+
+        /* Set up channel variables */
+        for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
+
+                if (!brd->channels[i])
+                        continue;
+
+                spin_lock_init(&ch->ch_lock);
+
+                if (brd->bd_uart_offset == 0x200)
+                        ch->ch_neo_uart =  vaddr + (brd->bd_uart_offset * i);
+
+                ch->ch_bd = brd;
+                ch->ch_portnum = i;
+
+                /* .25 second delay */
+                ch->ch_close_delay = 250;
+
+                init_waitqueue_head(&ch->ch_flags_wait);
+        }
+
+        jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
+        return 0;
+}
+
+int jsm_uart_port_init(struct jsm_board *brd)
+{
+        int i, rc;
+        unsigned int line;
+        struct jsm_channel *ch;
+
+        if (!brd)
+                return -ENXIO;
+
+        jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
+
+        /*
+         * Initialize board structure elements.
+         */
+
+        brd->nasync = brd->maxports;
+
+        /* Set up channel variables */
+        for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) {
+
+                if (!brd->channels[i])
+                        continue;
+
+                brd->channels[i]->uart_port.irq = brd->irq;
+                brd->channels[i]->uart_port.uartclk = 14745600;
+                brd->channels[i]->uart_port.type = PORT_JSM;
+                brd->channels[i]->uart_port.iotype = UPIO_MEM;
+                brd->channels[i]->uart_port.membase = brd->re_map_membase;
+                brd->channels[i]->uart_port.fifosize = 16;
+                brd->channels[i]->uart_port.ops = &jsm_ops;
+                line = find_first_zero_bit(linemap, MAXLINES);
+                if (line >= MAXLINES) {
+                        printk(KERN_INFO "jsm: linemap is full, added device failed\n");
+                        continue;
+                } else
+                        set_bit(line, linemap);
+                brd->channels[i]->uart_port.line = line;
+                rc = uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port);
+                if (rc){
+                        printk(KERN_INFO "jsm: Port %d failed. Aborting...\n", i);
+                        return rc;
+                }
+                else
+                        printk(KERN_INFO "jsm: Port %d added\n", i);
+        }
+
+        jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
+        return 0;
+}
+
+int jsm_remove_uart_port(struct jsm_board *brd)
+{
+        int i;
+        struct jsm_channel *ch;
+
+        if (!brd)
+                return -ENXIO;
+
+        jsm_printk(INIT, INFO, &brd->pci_dev, "start\n");
+
+        /*
+         * Initialize board structure elements.
+         */
+
+        brd->nasync = brd->maxports;
+
+        /* Set up channel variables */
+        for (i = 0; i < brd->nasync; i++) {
+
+                if (!brd->channels[i])
+                        continue;
+
+                ch = brd->channels[i];
+
+                clear_bit(ch->uart_port.line, linemap);
+                uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port);
+        }
+
+        jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n");
+        return 0;
+}
+
+void jsm_input(struct jsm_channel *ch)
+{
+        struct jsm_board *bd;
+        struct tty_struct *tp;
+        u32 rmask;
+        u16 head;
+        u16 tail;
+        int data_len;
+        unsigned long lock_flags;
+        int len = 0;
+        int n = 0;
+        int s = 0;
+        int i = 0;
+
+        jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n");
+
+        if (!ch)
+                return;
+
+        tp = ch->uart_port.state->port.tty;
+
+        bd = ch->ch_bd;
+        if(!bd)
+                return;
+
+        spin_lock_irqsave(&ch->ch_lock, lock_flags);
+
+        /*
+         *Figure the number of characters in the buffer.
+         *Exit immediately if none.
+         */
+
+        rmask = RQUEUEMASK;
+
+        head = ch->ch_r_head & rmask;
+        tail = ch->ch_r_tail & rmask;
+
+        data_len = (head - tail) & rmask;
+        if (data_len == 0) {
+                spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                return;
+        }
+
+        jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n");
+
+        /*
+         *If the device is not open, or CREAD is off, flush
+         *input data and return immediately.
+         */
+        if (!tp ||
+                !(tp->termios->c_cflag & CREAD) ) {
+
+                jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
+                        "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum);
+                ch->ch_r_head = tail;
+
+                /* Force queue flow control to be released, if needed */
+                jsm_check_queue_flow_control(ch);
+
+                spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                return;
+        }
+
+        /*
+         * If we are throttled, simply don't read any data.
+         */
+        if (ch->ch_flags & CH_STOPI) {
+                spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
+                        "Port %d throttled, not reading any data. head: %x tail: %x\n",
+                        ch->ch_portnum, head, tail);
+                return;
+        }
+
+        jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n");
+
+        if (data_len <= 0) {
+                spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+                jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n");
+                return;
+        }
+
+        len = tty_buffer_request_room(tp, data_len);
+        n = len;
+
+        /*
+         * n now contains the most amount of data we can copy,
+         * bounded either by the flip buffer size or the amount
+         * of data the card actually has pending...
+         */
+        while (n) {
+                s = ((head >= tail) ? head : RQUEUESIZE) - tail;
+                s = min(s, n);
+
+                if (s <= 0)
+                        break;
+
+                        /*
+                         * If conditions are such that ld needs to see all
+                         * UART errors, we will have to walk each character
+                         * and error byte and send them to the buffer one at
+                         * a time.
+                         */
+
+                if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
+                        for (i = 0; i < s; i++) {
+                                /*
+                                 * Give the Linux ld the flags in the
+                                 * format it likes.
+                                 */
+                                if (*(ch->ch_equeue +tail +i) & UART_LSR_BI)
+                                        tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i),  TTY_BREAK);
+                                else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE)
+                                        tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY);
+                                else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE)
+                                        tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME);
+                                else
+                                        tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL);
+                        }
+                } else {
+                        tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ;
+                }
+                tail += s;
+                n -= s;
+                /* Flip queue if needed */
+                tail &= rmask;
+        }
+
+        ch->ch_r_tail = tail & rmask;
+        ch->ch_e_tail = tail & rmask;
+        jsm_check_queue_flow_control(ch);
+        spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
+
+        /* Tell the tty layer its okay to "eat" the data now */
+        tty_flip_buffer_push(tp);
+
+        jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
+}
+
+static void jsm_carrier(struct jsm_channel *ch)
+{
+        struct jsm_board *bd;
+
+        int virt_carrier = 0;
+        int phys_carrier = 0;
+
+        jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n");
+        if (!ch)
+                return;
+
+        bd = ch->ch_bd;
+
+        if (!bd)
+                return;
+
+        if (ch->ch_mistat & UART_MSR_DCD) {
+                jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
+                        "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD);
+                phys_carrier = 1;
+        }
+
+        if (ch->ch_c_cflag & CLOCAL)
+                virt_carrier = 1;
+
+        jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
+                "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier);
+
+        /*
+         * Test for a VIRTUAL carrier transition to HIGH.
+         */
+        if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
+
+                /*
+                 * When carrier rises, wake any threads waiting
+                 * for carrier in the open routine.
+                 */
+
+                jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
+                        "carrier: virt DCD rose\n");
+
+                if (waitqueue_active(&(ch->ch_flags_wait)))
+                        wake_up_interruptible(&ch->ch_flags_wait);
+        }
+
+        /*
+         * Test for a PHYSICAL carrier transition to HIGH.
+         */
+        if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
+
+                /*
+                 * When carrier rises, wake any threads waiting
+                 * for carrier in the open routine.
+                 */
+
+                jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev,
+                        "carrier: physical DCD rose\n");
+
+                if (waitqueue_active(&(ch->ch_flags_wait)))
+                        wake_up_interruptible(&ch->ch_flags_wait);
+        }
+
+        /*
+         *  Test for a PHYSICAL transition to low, so long as we aren't
+         *  currently ignoring physical transitions (which is what "virtual
+         *  carrier" indicates).
+         *
+         *  The transition of the virtual carrier to low really doesn't
+         *  matter... it really only means "ignore carrier state", not
+         *  "make pretend that carrier is there".
+         */
+        if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0)
+                        && (phys_carrier == 0)) {
+                /*
+                 *      When carrier drops:
+                 *
+                 *      Drop carrier on all open units.
+                 *
+                 *      Flush queues, waking up any task waiting in the
+                 *      line discipline.
+                 *
+                 *      Send a hangup to the control terminal.
+                 *
+                 *      Enable all select calls.
+                 */
+                if (waitqueue_active(&(ch->ch_flags_wait)))
+                        wake_up_interruptible(&ch->ch_flags_wait);
+        }
+
+        /*
+         *  Make sure that our cached values reflect the current reality.
+         */
+        if (virt_carrier == 1)
+                ch->ch_flags |= CH_FCAR;
+        else
+                ch->ch_flags &= ~CH_FCAR;
+
+        if (phys_carrier == 1)
+                ch->ch_flags |= CH_CD;
+        else
+                ch->ch_flags &= ~CH_CD;
+}
+
+
+void jsm_check_queue_flow_control(struct jsm_channel *ch)
+{
+        struct board_ops *bd_ops = ch->ch_bd->bd_ops;
+        int qleft;
+
+        /* Store how much space we have left in the queue */
+        if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
+                qleft += RQUEUEMASK + 1;
+
+        /*
+         * Check to see if we should enforce flow control on our queue because
+         * the ld (or user) isn't reading data out of our queue fast enuf.
+         *
+         * NOTE: This is done based on what the current flow control of the
+         * port is set for.
+         *
+         * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt.
+         *      This will cause the UART's FIFO to back up, and force
+         *      the RTS signal to be dropped.
+         * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to
+         *      the other side, in hopes it will stop sending data to us.
+         * 3) NONE - Nothing we can do.  We will simply drop any extra data
+         *      that gets sent into us when the queue fills up.
+         */
+        if (qleft < 256) {
+                /* HWFLOW */
+                if (ch->ch_c_cflag & CRTSCTS) {
+                        if(!(ch->ch_flags & CH_RECEIVER_OFF)) {
+                                bd_ops->disable_receiver(ch);
+                                ch->ch_flags |= (CH_RECEIVER_OFF);
+                                jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
+                                        "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n",
+                                        qleft);
+                        }
+                }
+                /* SWFLOW */
+                else if (ch->ch_c_iflag & IXOFF) {
+                        if (ch->ch_stops_sent <= MAX_STOPS_SENT) {
+                                bd_ops->send_stop_character(ch);
+                                ch->ch_stops_sent++;
+                                jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
+                                        "Sending stop char! Times sent: %x\n", ch->ch_stops_sent);
+                        }
+                }
+        }
+
+        /*
+         * Check to see if we should unenforce flow control because
+         * ld (or user) finally read enuf data out of our queue.
+         *
+         * NOTE: This is done based on what the current flow control of the
+         * port is set for.
+         *
+         * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt.
+         *      This will cause the UART's FIFO to raise RTS back up,
+         *      which will allow the other side to start sending data again.
+         * 2) SWFLOW (IXOFF) - Send a start character to
+         *      the other side, so it will start sending data to us again.
+         * 3) NONE - Do nothing. Since we didn't do anything to turn off the
+         *      other side, we don't need to do anything now.
+         */
+        if (qleft > (RQUEUESIZE / 2)) {
+                /* HWFLOW */
+                if (ch->ch_c_cflag & CRTSCTS) {
+                        if (ch->ch_flags & CH_RECEIVER_OFF) {
+                                bd_ops->enable_receiver(ch);
+                                ch->ch_flags &= ~(CH_RECEIVER_OFF);
+                                jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
+                                        "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n",
+                                        qleft);
+                        }
+                }
+                /* SWFLOW */
+                else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) {
+                        ch->ch_stops_sent = 0;
+                        bd_ops->send_start_character(ch);
+                        jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n");
+                }
+        }
+}
+
+/*
+ * jsm_tty_write()
+ *
+ * Take data from the user or kernel and send it out to the FEP.
+ * In here exists all the Transparent Print magic as well.
+ */
+int jsm_tty_write(struct uart_port *port)
+{
+        int bufcount;
+        int data_count = 0,data_count1 =0;
+        u16 head;
+        u16 tail;
+        u16 tmask;
+        u32 remain;
+        int temp_tail = port->state->xmit.tail;
+        struct jsm_channel *channel = (struct jsm_channel *)port;
+
+        tmask = WQUEUEMASK;
+        head = (channel->ch_w_head) & tmask;
+        tail = (channel->ch_w_tail) & tmask;
+
+        if ((bufcount = tail - head - 1) < 0)
+                bufcount += WQUEUESIZE;
+
+        bufcount = min(bufcount, 56);
+        remain = WQUEUESIZE - head;
+
+        data_count = 0;
+        if (bufcount >= remain) {
+                bufcount -= remain;
+                while ((port->state->xmit.head != temp_tail) &&
+                (data_count < remain)) {
+                        channel->ch_wqueue[head++] =
+                        port->state->xmit.buf[temp_tail];
+
+                        temp_tail++;
+                        temp_tail &= (UART_XMIT_SIZE - 1);
+                        data_count++;
+                }
+                if (data_count == remain) head = 0;
+        }
+
+        data_count1 = 0;
+        if (bufcount > 0) {
+                remain = bufcount;
+                while ((port->state->xmit.head != temp_tail) &&
+                        (data_count1 < remain)) {
+                        channel->ch_wqueue[head++] =
+                                port->state->xmit.buf[temp_tail];
+
+                        temp_tail++;
+                        temp_tail &= (UART_XMIT_SIZE - 1);
+                        data_count1++;
+
+                }
+        }
+
+        port->state->xmit.tail = temp_tail;
+
+        data_count += data_count1;
+        if (data_count) {
+                head &= tmask;
+                channel->ch_w_head = head;
+        }
+
+        if (data_count) {
+                channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
+        }
+
+        return data_count;
+}
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
new file mode 100644
index 000000000000..87e7e6c876d4
--- /dev/null
+++ b/drivers/tty/serial/kgdboc.c
@@ -0,0 +1,328 @@
+/*
+ * Based on the same principle as kgdboe using the NETPOLL api, this
+ * driver uses a console polling api to implement a gdb serial inteface
+ * which is multiplexed on a console port.
+ *
+ * Maintainer: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * 2007-2008 (c) Jason Wessel - Wind River Systems, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/tty.h>
+#include <linux/console.h>
+#include <linux/vt_kern.h>
+#include <linux/input.h>
+
+#define MAX_CONFIG_LEN          40
+
+static struct kgdb_io           kgdboc_io_ops;
+
+/* -1 = init not run yet, 0 = unconfigured, 1 = configured. */
+static int configured           = -1;
+
+static char config[MAX_CONFIG_LEN];
+static struct kparam_string kps = {
+        .string                 = config,
+        .maxlen                 = MAX_CONFIG_LEN,
+};
+
+static int kgdboc_use_kms;  /* 1 if we use kernel mode switching */
+static struct tty_driver        *kgdb_tty_driver;
+static int                      kgdb_tty_line;
+
+#ifdef CONFIG_KDB_KEYBOARD
+static int kgdboc_reset_connect(struct input_handler *handler,
+                                struct input_dev *dev,
+                                const struct input_device_id *id)
+{
+        input_reset_device(dev);
+
+        /* Retrun an error - we do not want to bind, just to reset */
+        return -ENODEV;
+}
+
+static void kgdboc_reset_disconnect(struct input_handle *handle)
+{
+        /* We do not expect anyone to actually bind to us */
+        BUG();
+}
+
+static const struct input_device_id kgdboc_reset_ids[] = {
+        {
+                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+                .evbit = { BIT_MASK(EV_KEY) },
+        },
+        { }
+};
+
+static struct input_handler kgdboc_reset_handler = {
+        .connect        = kgdboc_reset_connect,
+        .disconnect     = kgdboc_reset_disconnect,
+        .name           = "kgdboc_reset",
+        .id_table       = kgdboc_reset_ids,
+};
+
+static DEFINE_MUTEX(kgdboc_reset_mutex);
+
+static void kgdboc_restore_input_helper(struct work_struct *dummy)
+{
+        /*
+         * We need to take a mutex to prevent several instances of
+         * this work running on different CPUs so they don't try
+         * to register again already registered handler.
+         */
+        mutex_lock(&kgdboc_reset_mutex);
+
+        if (input_register_handler(&kgdboc_reset_handler) == 0)
+                input_unregister_handler(&kgdboc_reset_handler);
+
+        mutex_unlock(&kgdboc_reset_mutex);
+}
+
+static DECLARE_WORK(kgdboc_restore_input_work, kgdboc_restore_input_helper);
+
+static void kgdboc_restore_input(void)
+{
+        if (likely(system_state == SYSTEM_RUNNING))
+                schedule_work(&kgdboc_restore_input_work);
+}
+
+static int kgdboc_register_kbd(char **cptr)
+{
+        if (strncmp(*cptr, "kbd", 3) == 0) {
+                if (kdb_poll_idx < KDB_POLL_FUNC_MAX) {
+                        kdb_poll_funcs[kdb_poll_idx] = kdb_get_kbd_char;
+                        kdb_poll_idx++;
+                        if (cptr[0][3] == ',')
+                                *cptr += 4;
+                        else
+                                return 1;
+                }
+        }
+        return 0;
+}
+
+static void kgdboc_unregister_kbd(void)
+{
+        int i;
+
+        for (i = 0; i < kdb_poll_idx; i++) {
+                if (kdb_poll_funcs[i] == kdb_get_kbd_char) {
+                        kdb_poll_idx--;
+                        kdb_poll_funcs[i] = kdb_poll_funcs[kdb_poll_idx];
+                        kdb_poll_funcs[kdb_poll_idx] = NULL;
+                        i--;
+                }
+        }
+        flush_work_sync(&kgdboc_restore_input_work);
+}
+#else /* ! CONFIG_KDB_KEYBOARD */
+#define kgdboc_register_kbd(x) 0
+#define kgdboc_unregister_kbd()
+#define kgdboc_restore_input()
+#endif /* ! CONFIG_KDB_KEYBOARD */
+
+static int kgdboc_option_setup(char *opt)
+{
+        if (strlen(opt) >= MAX_CONFIG_LEN) {
+                printk(KERN_ERR "kgdboc: config string too long\n");
+                return -ENOSPC;
+        }
+        strcpy(config, opt);
+
+        return 0;
+}
+
+__setup("kgdboc=", kgdboc_option_setup);
+
+static void cleanup_kgdboc(void)
+{
+        kgdboc_unregister_kbd();
+        if (configured == 1)
+                kgdb_unregister_io_module(&kgdboc_io_ops);
+}
+
+static int configure_kgdboc(void)
+{
+        struct tty_driver *p;
+        int tty_line = 0;
+        int err;
+        char *cptr = config;
+        struct console *cons;
+
+        err = kgdboc_option_setup(config);
+        if (err || !strlen(config) || isspace(config[0]))
+                goto noconfig;
+
+        err = -ENODEV;
+        kgdboc_io_ops.is_console = 0;
+        kgdb_tty_driver = NULL;
+
+        kgdboc_use_kms = 0;
+        if (strncmp(cptr, "kms,", 4) == 0) {
+                cptr += 4;
+                kgdboc_use_kms = 1;
+        }
+
+        if (kgdboc_register_kbd(&cptr))
+                goto do_register;
+
+        p = tty_find_polling_driver(cptr, &tty_line);
+        if (!p)
+                goto noconfig;
+
+        cons = console_drivers;
+        while (cons) {
+                int idx;
+                if (cons->device && cons->device(cons, &idx) == p &&
+                    idx == tty_line) {
+                        kgdboc_io_ops.is_console = 1;
+                        break;
+                }
+                cons = cons->next;
+        }
+
+        kgdb_tty_driver = p;
+        kgdb_tty_line = tty_line;
+
+do_register:
+        err = kgdb_register_io_module(&kgdboc_io_ops);
+        if (err)
+                goto noconfig;
+
+        configured = 1;
+
+        return 0;
+
+noconfig:
+        config[0] = 0;
+        configured = 0;
+        cleanup_kgdboc();
+
+        return err;
+}
+
+static int __init init_kgdboc(void)
+{
+        /* Already configured? */
+        if (configured == 1)
+                return 0;
+
+        return configure_kgdboc();
+}
+
+static int kgdboc_get_char(void)
+{
+        if (!kgdb_tty_driver)
+                return -1;
+        return kgdb_tty_driver->ops->poll_get_char(kgdb_tty_driver,
+                                                kgdb_tty_line);
+}
+
+static void kgdboc_put_char(u8 chr)
+{
+        if (!kgdb_tty_driver)
+                return;
+        kgdb_tty_driver->ops->poll_put_char(kgdb_tty_driver,
+                                        kgdb_tty_line, chr);
+}
+
+static int param_set_kgdboc_var(const char *kmessage, struct kernel_param *kp)
+{
+        int len = strlen(kmessage);
+
+        if (len >= MAX_CONFIG_LEN) {
+                printk(KERN_ERR "kgdboc: config string too long\n");
+                return -ENOSPC;
+        }
+
+        /* Only copy in the string if the init function has not run yet */
+        if (configured < 0) {
+                strcpy(config, kmessage);
+                return 0;
+        }
+
+        if (kgdb_connected) {
+                printk(KERN_ERR
+                       "kgdboc: Cannot reconfigure while KGDB is connected.\n");
+
+                return -EBUSY;
+        }
+
+        strcpy(config, kmessage);
+        /* Chop out \n char as a result of echo */
+        if (config[len - 1] == '\n')
+                config[len - 1] = '\0';
+
+        if (configured == 1)
+                cleanup_kgdboc();
+
+        /* Go and configure with the new params. */
+        return configure_kgdboc();
+}
+
+static int dbg_restore_graphics;
+
+static void kgdboc_pre_exp_handler(void)
+{
+        if (!dbg_restore_graphics && kgdboc_use_kms) {
+                dbg_restore_graphics = 1;
+                con_debug_enter(vc_cons[fg_console].d);
+        }
+        /* Increment the module count when the debugger is active */
+        if (!kgdb_connected)
+                try_module_get(THIS_MODULE);
+}
+
+static void kgdboc_post_exp_handler(void)
+{
+        /* decrement the module count when the debugger detaches */
+        if (!kgdb_connected)
+                module_put(THIS_MODULE);
+        if (kgdboc_use_kms && dbg_restore_graphics) {
+                dbg_restore_graphics = 0;
+                con_debug_leave();
+        }
+        kgdboc_restore_input();
+}
+
+static struct kgdb_io kgdboc_io_ops = {
+        .name                   = "kgdboc",
+        .read_char              = kgdboc_get_char,
+        .write_char             = kgdboc_put_char,
+        .pre_exception          = kgdboc_pre_exp_handler,
+        .post_exception         = kgdboc_post_exp_handler,
+};
+
+#ifdef CONFIG_KGDB_SERIAL_CONSOLE
+/* This is only available if kgdboc is a built in for early debugging */
+static int __init kgdboc_early_init(char *opt)
+{
+        /* save the first character of the config string because the
+         * init routine can destroy it.
+         */
+        char save_ch;
+
+        kgdboc_option_setup(opt);
+        save_ch = config[0];
+        init_kgdboc();
+        config[0] = save_ch;
+        return 0;
+}
+
+early_param("ekgdboc", kgdboc_early_init);
+#endif /* CONFIG_KGDB_SERIAL_CONSOLE */
+
+module_init(init_kgdboc);
+module_exit(cleanup_kgdboc);
+module_param_call(kgdboc, param_set_kgdboc_var, param_get_string, &kps, 0644);
+MODULE_PARM_DESC(kgdboc, "<serial_device>[,baud]");
+MODULE_DESCRIPTION("KGDB Console TTY Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
new file mode 100644
index 000000000000..58cf279ed879
--- /dev/null
+++ b/drivers/tty/serial/lantiq.c
@@ -0,0 +1,756 @@
+/*
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Copyright (C) 2004 Infineon IFAP DC COM CPE
+ * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ * Copyright (C) 2010 Thomas Langer, <thomas.langer@lantiq.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#include <lantiq_soc.h>
+
+#define PORT_LTQ_ASC            111
+#define MAXPORTS                2
+#define UART_DUMMY_UER_RX       1
+#define DRVNAME                 "ltq_asc"
+#ifdef __BIG_ENDIAN
+#define LTQ_ASC_TBUF            (0x0020 + 3)
+#define LTQ_ASC_RBUF            (0x0024 + 3)
+#else
+#define LTQ_ASC_TBUF            0x0020
+#define LTQ_ASC_RBUF            0x0024
+#endif
+#define LTQ_ASC_FSTAT           0x0048
+#define LTQ_ASC_WHBSTATE        0x0018
+#define LTQ_ASC_STATE           0x0014
+#define LTQ_ASC_IRNCR           0x00F8
+#define LTQ_ASC_CLC             0x0000
+#define LTQ_ASC_ID              0x0008
+#define LTQ_ASC_PISEL           0x0004
+#define LTQ_ASC_TXFCON          0x0044
+#define LTQ_ASC_RXFCON          0x0040
+#define LTQ_ASC_CON             0x0010
+#define LTQ_ASC_BG              0x0050
+#define LTQ_ASC_IRNREN          0x00F4
+
+#define ASC_IRNREN_TX           0x1
+#define ASC_IRNREN_RX           0x2
+#define ASC_IRNREN_ERR          0x4
+#define ASC_IRNREN_TX_BUF       0x8
+#define ASC_IRNCR_TIR           0x1
+#define ASC_IRNCR_RIR           0x2
+#define ASC_IRNCR_EIR           0x4
+
+#define ASCOPT_CSIZE            0x3
+#define TXFIFO_FL               1
+#define RXFIFO_FL               1
+#define ASCCLC_DISS             0x2
+#define ASCCLC_RMCMASK          0x0000FF00
+#define ASCCLC_RMCOFFSET        8
+#define ASCCON_M_8ASYNC         0x0
+#define ASCCON_M_7ASYNC         0x2
+#define ASCCON_ODD              0x00000020
+#define ASCCON_STP              0x00000080
+#define ASCCON_BRS              0x00000100
+#define ASCCON_FDE              0x00000200
+#define ASCCON_R                0x00008000
+#define ASCCON_FEN              0x00020000
+#define ASCCON_ROEN             0x00080000
+#define ASCCON_TOEN             0x00100000
+#define ASCSTATE_PE             0x00010000
+#define ASCSTATE_FE             0x00020000
+#define ASCSTATE_ROE            0x00080000
+#define ASCSTATE_ANY            (ASCSTATE_ROE|ASCSTATE_PE|ASCSTATE_FE)
+#define ASCWHBSTATE_CLRREN      0x00000001
+#define ASCWHBSTATE_SETREN      0x00000002
+#define ASCWHBSTATE_CLRPE       0x00000004
+#define ASCWHBSTATE_CLRFE       0x00000008
+#define ASCWHBSTATE_CLRROE      0x00000020
+#define ASCTXFCON_TXFEN         0x0001
+#define ASCTXFCON_TXFFLU        0x0002
+#define ASCTXFCON_TXFITLMASK    0x3F00
+#define ASCTXFCON_TXFITLOFF     8
+#define ASCRXFCON_RXFEN         0x0001
+#define ASCRXFCON_RXFFLU        0x0002
+#define ASCRXFCON_RXFITLMASK    0x3F00
+#define ASCRXFCON_RXFITLOFF     8
+#define ASCFSTAT_RXFFLMASK      0x003F
+#define ASCFSTAT_TXFFLMASK      0x3F00
+#define ASCFSTAT_TXFREEMASK     0x3F000000
+#define ASCFSTAT_TXFREEOFF      24
+
+static void lqasc_tx_chars(struct uart_port *port);
+static struct ltq_uart_port *lqasc_port[MAXPORTS];
+static struct uart_driver lqasc_reg;
+static DEFINE_SPINLOCK(ltq_asc_lock);
+
+struct ltq_uart_port {
+        struct uart_port        port;
+        struct clk              *clk;
+        unsigned int            tx_irq;
+        unsigned int            rx_irq;
+        unsigned int            err_irq;
+};
+
+static inline struct
+ltq_uart_port *to_ltq_uart_port(struct uart_port *port)
+{
+        return container_of(port, struct ltq_uart_port, port);
+}
+
+static void
+lqasc_stop_tx(struct uart_port *port)
+{
+        return;
+}
+
+static void
+lqasc_start_tx(struct uart_port *port)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&ltq_asc_lock, flags);
+        lqasc_tx_chars(port);
+        spin_unlock_irqrestore(&ltq_asc_lock, flags);
+        return;
+}
+
+static void
+lqasc_stop_rx(struct uart_port *port)
+{
+        ltq_w32(ASCWHBSTATE_CLRREN, port->membase + LTQ_ASC_WHBSTATE);
+}
+
+static void
+lqasc_enable_ms(struct uart_port *port)
+{
+}
+
+static int
+lqasc_rx_chars(struct uart_port *port)
+{
+        struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+        unsigned int ch = 0, rsr = 0, fifocnt;
+
+        if (!tty) {
+                dev_dbg(port->dev, "%s:tty is busy now", __func__);
+                return -EBUSY;
+        }
+        fifocnt =
+                ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
+        while (fifocnt--) {
+                u8 flag = TTY_NORMAL;
+                ch = ltq_r8(port->membase + LTQ_ASC_RBUF);
+                rsr = (ltq_r32(port->membase + LTQ_ASC_STATE)
+                        & ASCSTATE_ANY) | UART_DUMMY_UER_RX;
+                tty_flip_buffer_push(tty);
+                port->icount.rx++;
+
+                /*
+                 * Note that the error handling code is
+                 * out of the main execution path
+                 */
+                if (rsr & ASCSTATE_ANY) {
+                        if (rsr & ASCSTATE_PE) {
+                                port->icount.parity++;
+                                ltq_w32_mask(0, ASCWHBSTATE_CLRPE,
+                                        port->membase + LTQ_ASC_WHBSTATE);
+                        } else if (rsr & ASCSTATE_FE) {
+                                port->icount.frame++;
+                                ltq_w32_mask(0, ASCWHBSTATE_CLRFE,
+                                        port->membase + LTQ_ASC_WHBSTATE);
+                        }
+                        if (rsr & ASCSTATE_ROE) {
+                                port->icount.overrun++;
+                                ltq_w32_mask(0, ASCWHBSTATE_CLRROE,
+                                        port->membase + LTQ_ASC_WHBSTATE);
+                        }
+
+                        rsr &= port->read_status_mask;
+
+                        if (rsr & ASCSTATE_PE)
+                                flag = TTY_PARITY;
+                        else if (rsr & ASCSTATE_FE)
+                                flag = TTY_FRAME;
+                }
+
+                if ((rsr & port->ignore_status_mask) == 0)
+                        tty_insert_flip_char(tty, ch, flag);
+
+                if (rsr & ASCSTATE_ROE)
+                        /*
+                         * Overrun is special, since it's reported
+                         * immediately, and doesn't affect the current
+                         * character
+                         */
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+        }
+        if (ch != 0)
+                tty_flip_buffer_push(tty);
+        tty_kref_put(tty);
+        return 0;
+}
+
+static void
+lqasc_tx_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+        if (uart_tx_stopped(port)) {
+                lqasc_stop_tx(port);
+                return;
+        }
+
+        while (((ltq_r32(port->membase + LTQ_ASC_FSTAT) &
+                ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF) != 0) {
+                if (port->x_char) {
+                        ltq_w8(port->x_char, port->membase + LTQ_ASC_TBUF);
+                        port->icount.tx++;
+                        port->x_char = 0;
+                        continue;
+                }
+
+                if (uart_circ_empty(xmit))
+                        break;
+
+                ltq_w8(port->state->xmit.buf[port->state->xmit.tail],
+                        port->membase + LTQ_ASC_TBUF);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+}
+
+static irqreturn_t
+lqasc_tx_int(int irq, void *_port)
+{
+        unsigned long flags;
+        struct uart_port *port = (struct uart_port *)_port;
+        spin_lock_irqsave(&ltq_asc_lock, flags);
+        ltq_w32(ASC_IRNCR_TIR, port->membase + LTQ_ASC_IRNCR);
+        spin_unlock_irqrestore(&ltq_asc_lock, flags);
+        lqasc_start_tx(port);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t
+lqasc_err_int(int irq, void *_port)
+{
+        unsigned long flags;
+        struct uart_port *port = (struct uart_port *)_port;
+        spin_lock_irqsave(&ltq_asc_lock, flags);
+        /* clear any pending interrupts */
+        ltq_w32_mask(0, ASCWHBSTATE_CLRPE | ASCWHBSTATE_CLRFE |
+                ASCWHBSTATE_CLRROE, port->membase + LTQ_ASC_WHBSTATE);
+        spin_unlock_irqrestore(&ltq_asc_lock, flags);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t
+lqasc_rx_int(int irq, void *_port)
+{
+        unsigned long flags;
+        struct uart_port *port = (struct uart_port *)_port;
+        spin_lock_irqsave(&ltq_asc_lock, flags);
+        ltq_w32(ASC_IRNCR_RIR, port->membase + LTQ_ASC_IRNCR);
+        lqasc_rx_chars(port);
+        spin_unlock_irqrestore(&ltq_asc_lock, flags);
+        return IRQ_HANDLED;
+}
+
+static unsigned int
+lqasc_tx_empty(struct uart_port *port)
+{
+        int status;
+        status = ltq_r32(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_TXFFLMASK;
+        return status ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int
+lqasc_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CTS | TIOCM_CAR | TIOCM_DSR;
+}
+
+static void
+lqasc_set_mctrl(struct uart_port *port, u_int mctrl)
+{
+}
+
+static void
+lqasc_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static int
+lqasc_startup(struct uart_port *port)
+{
+        struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
+        int retval;
+
+        port->uartclk = clk_get_rate(ltq_port->clk);
+
+        ltq_w32_mask(ASCCLC_DISS | ASCCLC_RMCMASK, (1 << ASCCLC_RMCOFFSET),
+                port->membase + LTQ_ASC_CLC);
+
+        ltq_w32(0, port->membase + LTQ_ASC_PISEL);
+        ltq_w32(
+                ((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) |
+                ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU,
+                port->membase + LTQ_ASC_TXFCON);
+        ltq_w32(
+                ((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK)
+                | ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU,
+                port->membase + LTQ_ASC_RXFCON);
+        /* make sure other settings are written to hardware before
+         * setting enable bits
+         */
+        wmb();
+        ltq_w32_mask(0, ASCCON_M_8ASYNC | ASCCON_FEN | ASCCON_TOEN |
+                ASCCON_ROEN, port->membase + LTQ_ASC_CON);
+
+        retval = request_irq(ltq_port->tx_irq, lqasc_tx_int,
+                IRQF_DISABLED, "asc_tx", port);
+        if (retval) {
+                pr_err("failed to request lqasc_tx_int\n");
+                return retval;
+        }
+
+        retval = request_irq(ltq_port->rx_irq, lqasc_rx_int,
+                IRQF_DISABLED, "asc_rx", port);
+        if (retval) {
+                pr_err("failed to request lqasc_rx_int\n");
+                goto err1;
+        }
+
+        retval = request_irq(ltq_port->err_irq, lqasc_err_int,
+                IRQF_DISABLED, "asc_err", port);
+        if (retval) {
+                pr_err("failed to request lqasc_err_int\n");
+                goto err2;
+        }
+
+        ltq_w32(ASC_IRNREN_RX | ASC_IRNREN_ERR | ASC_IRNREN_TX,
+                port->membase + LTQ_ASC_IRNREN);
+        return 0;
+
+err2:
+        free_irq(ltq_port->rx_irq, port);
+err1:
+        free_irq(ltq_port->tx_irq, port);
+        return retval;
+}
+
+static void
+lqasc_shutdown(struct uart_port *port)
+{
+        struct ltq_uart_port *ltq_port = to_ltq_uart_port(port);
+        free_irq(ltq_port->tx_irq, port);
+        free_irq(ltq_port->rx_irq, port);
+        free_irq(ltq_port->err_irq, port);
+
+        ltq_w32(0, port->membase + LTQ_ASC_CON);
+        ltq_w32_mask(ASCRXFCON_RXFEN, ASCRXFCON_RXFFLU,
+                port->membase + LTQ_ASC_RXFCON);
+        ltq_w32_mask(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
+                port->membase + LTQ_ASC_TXFCON);
+}
+
+static void
+lqasc_set_termios(struct uart_port *port,
+        struct ktermios *new, struct ktermios *old)
+{
+        unsigned int cflag;
+        unsigned int iflag;
+        unsigned int divisor;
+        unsigned int baud;
+        unsigned int con = 0;
+        unsigned long flags;
+
+        cflag = new->c_cflag;
+        iflag = new->c_iflag;
+
+        switch (cflag & CSIZE) {
+        case CS7:
+                con = ASCCON_M_7ASYNC;
+                break;
+
+        case CS5:
+        case CS6:
+        default:
+                new->c_cflag &= ~ CSIZE;
+                new->c_cflag |= CS8;
+                con = ASCCON_M_8ASYNC;
+                break;
+        }
+
+        cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
+
+        if (cflag & CSTOPB)
+                con |= ASCCON_STP;
+
+        if (cflag & PARENB) {
+                if (!(cflag & PARODD))
+                        con &= ~ASCCON_ODD;
+                else
+                        con |= ASCCON_ODD;
+        }
+
+        port->read_status_mask = ASCSTATE_ROE;
+        if (iflag & INPCK)
+                port->read_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
+
+        port->ignore_status_mask = 0;
+        if (iflag & IGNPAR)
+                port->ignore_status_mask |= ASCSTATE_FE | ASCSTATE_PE;
+
+        if (iflag & IGNBRK) {
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (iflag & IGNPAR)
+                        port->ignore_status_mask |= ASCSTATE_ROE;
+        }
+
+        if ((cflag & CREAD) == 0)
+                port->ignore_status_mask |= UART_DUMMY_UER_RX;
+
+        /* set error signals  - framing, parity  and overrun, enable receiver */
+        con |= ASCCON_FEN | ASCCON_TOEN | ASCCON_ROEN;
+
+        spin_lock_irqsave(&ltq_asc_lock, flags);
+
+        /* set up CON */
+        ltq_w32_mask(0, con, port->membase + LTQ_ASC_CON);
+
+        /* Set baud rate - take a divider of 2 into account */
+        baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
+        divisor = uart_get_divisor(port, baud);
+        divisor = divisor / 2 - 1;
+
+        /* disable the baudrate generator */
+        ltq_w32_mask(ASCCON_R, 0, port->membase + LTQ_ASC_CON);
+
+        /* make sure the fractional divider is off */
+        ltq_w32_mask(ASCCON_FDE, 0, port->membase + LTQ_ASC_CON);
+
+        /* set up to use divisor of 2 */
+        ltq_w32_mask(ASCCON_BRS, 0, port->membase + LTQ_ASC_CON);
+
+        /* now we can write the new baudrate into the register */
+        ltq_w32(divisor, port->membase + LTQ_ASC_BG);
+
+        /* turn the baudrate generator back on */
+        ltq_w32_mask(0, ASCCON_R, port->membase + LTQ_ASC_CON);
+
+        /* enable rx */
+        ltq_w32(ASCWHBSTATE_SETREN, port->membase + LTQ_ASC_WHBSTATE);
+
+        spin_unlock_irqrestore(&ltq_asc_lock, flags);
+
+        /* Don't rewrite B0 */
+        if (tty_termios_baud_rate(new))
+                tty_termios_encode_baud_rate(new, baud, baud);
+}
+
+static const char*
+lqasc_type(struct uart_port *port)
+{
+        if (port->type == PORT_LTQ_ASC)
+                return DRVNAME;
+        else
+                return NULL;
+}
+
+static void
+lqasc_release_port(struct uart_port *port)
+{
+        if (port->flags & UPF_IOREMAP) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+}
+
+static int
+lqasc_request_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        struct resource *res;
+        int size;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "cannot obtain I/O memory region");
+                return -ENODEV;
+        }
+        size = resource_size(res);
+
+        res = devm_request_mem_region(&pdev->dev, res->start,
+                size, dev_name(&pdev->dev));
+        if (!res) {
+                dev_err(&pdev->dev, "cannot request I/O memory region");
+                return -EBUSY;
+        }
+
+        if (port->flags & UPF_IOREMAP) {
+                port->membase = devm_ioremap_nocache(&pdev->dev,
+                        port->mapbase, size);
+                if (port->membase == NULL)
+                        return -ENOMEM;
+        }
+        return 0;
+}
+
+static void
+lqasc_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_LTQ_ASC;
+                lqasc_request_port(port);
+        }
+}
+
+static int
+lqasc_verify_port(struct uart_port *port,
+        struct serial_struct *ser)
+{
+        int ret = 0;
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_LTQ_ASC)
+                ret = -EINVAL;
+        if (ser->irq < 0 || ser->irq >= NR_IRQS)
+                ret = -EINVAL;
+        if (ser->baud_base < 9600)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops lqasc_pops = {
+        .tx_empty =     lqasc_tx_empty,
+        .set_mctrl =    lqasc_set_mctrl,
+        .get_mctrl =    lqasc_get_mctrl,
+        .stop_tx =      lqasc_stop_tx,
+        .start_tx =     lqasc_start_tx,
+        .stop_rx =      lqasc_stop_rx,
+        .enable_ms =    lqasc_enable_ms,
+        .break_ctl =    lqasc_break_ctl,
+        .startup =      lqasc_startup,
+        .shutdown =     lqasc_shutdown,
+        .set_termios =  lqasc_set_termios,
+        .type =         lqasc_type,
+        .release_port = lqasc_release_port,
+        .request_port = lqasc_request_port,
+        .config_port =  lqasc_config_port,
+        .verify_port =  lqasc_verify_port,
+};
+
+static void
+lqasc_console_putchar(struct uart_port *port, int ch)
+{
+        int fifofree;
+
+        if (!port->membase)
+                return;
+
+        do {
+                fifofree = (ltq_r32(port->membase + LTQ_ASC_FSTAT)
+                        & ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF;
+        } while (fifofree == 0);
+        ltq_w8(ch, port->membase + LTQ_ASC_TBUF);
+}
+
+
+static void
+lqasc_console_write(struct console *co, const char *s, u_int count)
+{
+        struct ltq_uart_port *ltq_port;
+        struct uart_port *port;
+        unsigned long flags;
+
+        if (co->index >= MAXPORTS)
+                return;
+
+        ltq_port = lqasc_port[co->index];
+        if (!ltq_port)
+                return;
+
+        port = &ltq_port->port;
+
+        spin_lock_irqsave(&ltq_asc_lock, flags);
+        uart_console_write(port, s, count, lqasc_console_putchar);
+        spin_unlock_irqrestore(&ltq_asc_lock, flags);
+}
+
+static int __init
+lqasc_console_setup(struct console *co, char *options)
+{
+        struct ltq_uart_port *ltq_port;
+        struct uart_port *port;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (co->index >= MAXPORTS)
+                return -ENODEV;
+
+        ltq_port = lqasc_port[co->index];
+        if (!ltq_port)
+                return -ENODEV;
+
+        port = &ltq_port->port;
+
+        port->uartclk = clk_get_rate(ltq_port->clk);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct console lqasc_console = {
+        .name =         "ttyLTQ",
+        .write =        lqasc_console_write,
+        .device =       uart_console_device,
+        .setup =        lqasc_console_setup,
+        .flags =        CON_PRINTBUFFER,
+        .index =        -1,
+        .data =         &lqasc_reg,
+};
+
+static int __init
+lqasc_console_init(void)
+{
+        register_console(&lqasc_console);
+        return 0;
+}
+console_initcall(lqasc_console_init);
+
+static struct uart_driver lqasc_reg = {
+        .owner =        THIS_MODULE,
+        .driver_name =  DRVNAME,
+        .dev_name =     "ttyLTQ",
+        .major =        0,
+        .minor =        0,
+        .nr =           MAXPORTS,
+        .cons =         &lqasc_console,
+};
+
+static int __init
+lqasc_probe(struct platform_device *pdev)
+{
+        struct ltq_uart_port *ltq_port;
+        struct uart_port *port;
+        struct resource *mmres, *irqres;
+        int tx_irq, rx_irq, err_irq;
+        struct clk *clk;
+        int ret;
+
+        mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!mmres || !irqres)
+                return -ENODEV;
+
+        if (pdev->id >= MAXPORTS)
+                return -EBUSY;
+
+        if (lqasc_port[pdev->id] != NULL)
+                return -EBUSY;
+
+        clk = clk_get(&pdev->dev, "fpi");
+        if (IS_ERR(clk)) {
+                pr_err("failed to get fpi clk\n");
+                return -ENOENT;
+        }
+
+        tx_irq = platform_get_irq_byname(pdev, "tx");
+        rx_irq = platform_get_irq_byname(pdev, "rx");
+        err_irq = platform_get_irq_byname(pdev, "err");
+        if ((tx_irq < 0) | (rx_irq < 0) | (err_irq < 0))
+                return -ENODEV;
+
+        ltq_port = kzalloc(sizeof(struct ltq_uart_port), GFP_KERNEL);
+        if (!ltq_port)
+                return -ENOMEM;
+
+        port = &ltq_port->port;
+
+        port->iotype    = SERIAL_IO_MEM;
+        port->flags     = ASYNC_BOOT_AUTOCONF | UPF_IOREMAP;
+        port->ops       = &lqasc_pops;
+        port->fifosize  = 16;
+        port->type      = PORT_LTQ_ASC,
+        port->line      = pdev->id;
+        port->dev       = &pdev->dev;
+
+        port->irq       = tx_irq; /* unused, just to be backward-compatibe */
+        port->mapbase   = mmres->start;
+
+        ltq_port->clk   = clk;
+
+        ltq_port->tx_irq = tx_irq;
+        ltq_port->rx_irq = rx_irq;
+        ltq_port->err_irq = err_irq;
+
+        lqasc_port[pdev->id] = ltq_port;
+        platform_set_drvdata(pdev, ltq_port);
+
+        ret = uart_add_one_port(&lqasc_reg, port);
+
+        return ret;
+}
+
+static struct platform_driver lqasc_driver = {
+        .driver         = {
+                .name   = DRVNAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+int __init
+init_lqasc(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&lqasc_reg);
+        if (ret != 0)
+                return ret;
+
+        ret = platform_driver_probe(&lqasc_driver, lqasc_probe);
+        if (ret != 0)
+                uart_unregister_driver(&lqasc_reg);
+
+        return ret;
+}
+
+module_init(init_lqasc);
+
+MODULE_DESCRIPTION("Lantiq serial port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
new file mode 100644
index 000000000000..84db7321cce8
--- /dev/null
+++ b/drivers/tty/serial/m32r_sio.c
@@ -0,0 +1,1193 @@
+/*
+ *  m32r_sio.c
+ *
+ *  Driver for M32R serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *  Based on drivers/serial/8250.c.
+ *
+ *  Copyright (C) 2001  Russell King.
+ *  Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * A note about mapbase / membase
+ *
+ *  mapbase is the physical address of the IO port.  Currently, we don't
+ *  support this very well, and it may well be dropped from this driver
+ *  in future.  As such, mapbase should be NULL.
+ *
+ *  membase is an 'ioremapped' cookie.  This is compatible with the old
+ *  serial.c driver, and is currently the preferred form.
+ */
+
+#if defined(CONFIG_SERIAL_M32R_SIO_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/serial.h>
+#include <linux/serialP.h>
+#include <linux/delay.h>
+
+#include <asm/m32r.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#define PORT_M32R_BASE  PORT_M32R_SIO
+#define PORT_INDEX(x)   (x - PORT_M32R_BASE + 1)
+#define BAUD_RATE       115200
+
+#include <linux/serial_core.h>
+#include "m32r_sio.h"
+#include "m32r_sio_reg.h"
+
+/*
+ * Debugging.
+ */
+#if 0
+#define DEBUG_AUTOCONF(fmt...)  printk(fmt)
+#else
+#define DEBUG_AUTOCONF(fmt...)  do { } while (0)
+#endif
+
+#if 0
+#define DEBUG_INTR(fmt...)      printk(fmt)
+#else
+#define DEBUG_INTR(fmt...)      do { } while (0)
+#endif
+
+#define PASS_LIMIT      256
+
+/*
+ * We default to IRQ0 for the "no irq" hack.   Some
+ * machine types want others as well - they're free
+ * to redefine this in their header file.
+ */
+#define is_real_interrupt(irq)  ((irq) != 0)
+
+#define BASE_BAUD       115200
+
+/* Standard COM flags */
+#define STD_COM_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST)
+
+/*
+ * SERIAL_PORT_DFNS tells us about built-in ports that have no
+ * standard enumeration mechanism.   Platforms that can find all
+ * serial ports via mechanisms like ACPI or PCI need not supply it.
+ */
+#if defined(CONFIG_PLAT_USRV)
+
+#define SERIAL_PORT_DFNS                                                \
+       /* UART  CLK     PORT   IRQ            FLAGS */                  \
+        { 0, BASE_BAUD, 0x3F8, PLD_IRQ_UART0, STD_COM_FLAGS }, /* ttyS0 */ \
+        { 0, BASE_BAUD, 0x2F8, PLD_IRQ_UART1, STD_COM_FLAGS }, /* ttyS1 */
+
+#else /* !CONFIG_PLAT_USRV */
+
+#if defined(CONFIG_SERIAL_M32R_PLDSIO)
+#define SERIAL_PORT_DFNS                                                \
+        { 0, BASE_BAUD, ((unsigned long)PLD_ESIO0CR), PLD_IRQ_SIO0_RCV, \
+          STD_COM_FLAGS }, /* ttyS0 */
+#else
+#define SERIAL_PORT_DFNS                                                \
+        { 0, BASE_BAUD, M32R_SIO_OFFSET, M32R_IRQ_SIO0_R,               \
+          STD_COM_FLAGS }, /* ttyS0 */
+#endif
+
+#endif /* !CONFIG_PLAT_USRV */
+
+static struct old_serial_port old_serial_port[] = {
+        SERIAL_PORT_DFNS
+};
+
+#define UART_NR ARRAY_SIZE(old_serial_port)
+
+struct uart_sio_port {
+        struct uart_port        port;
+        struct timer_list       timer;          /* "no irq" timer */
+        struct list_head        list;           /* ports on this IRQ */
+        unsigned short          rev;
+        unsigned char           acr;
+        unsigned char           ier;
+        unsigned char           lcr;
+        unsigned char           mcr_mask;       /* mask of user bits */
+        unsigned char           mcr_force;      /* mask of forced bits */
+        unsigned char           lsr_break_flag;
+
+        /*
+         * We provide a per-port pm hook.
+         */
+        void                    (*pm)(struct uart_port *port,
+                                      unsigned int state, unsigned int old);
+};
+
+struct irq_info {
+        spinlock_t              lock;
+        struct list_head        *head;
+};
+
+static struct irq_info irq_lists[NR_IRQS];
+
+/*
+ * Here we define the default xmit fifo size used for each type of UART.
+ */
+static const struct serial_uart_config uart_config[] = {
+        [PORT_UNKNOWN] = {
+                .name                   = "unknown",
+                .dfl_xmit_fifo_size     = 1,
+                .flags                  = 0,
+        },
+        [PORT_INDEX(PORT_M32R_SIO)] = {
+                .name                   = "M32RSIO",
+                .dfl_xmit_fifo_size     = 1,
+                .flags                  = 0,
+        },
+};
+
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+
+#define __sio_in(x) inw((unsigned long)(x))
+#define __sio_out(v,x) outw((v),(unsigned long)(x))
+
+static inline void sio_set_baud_rate(unsigned long baud)
+{
+        unsigned short sbaud;
+        sbaud = (boot_cpu_data.bus_clock / (baud * 4))-1;
+        __sio_out(sbaud, PLD_ESIO0BAUR);
+}
+
+static void sio_reset(void)
+{
+        unsigned short tmp;
+
+        tmp = __sio_in(PLD_ESIO0RXB);
+        tmp = __sio_in(PLD_ESIO0RXB);
+        tmp = __sio_in(PLD_ESIO0CR);
+        sio_set_baud_rate(BAUD_RATE);
+        __sio_out(0x0300, PLD_ESIO0CR);
+        __sio_out(0x0003, PLD_ESIO0CR);
+}
+
+static void sio_init(void)
+{
+        unsigned short tmp;
+
+        tmp = __sio_in(PLD_ESIO0RXB);
+        tmp = __sio_in(PLD_ESIO0RXB);
+        tmp = __sio_in(PLD_ESIO0CR);
+        __sio_out(0x0300, PLD_ESIO0CR);
+        __sio_out(0x0003, PLD_ESIO0CR);
+}
+
+static void sio_error(int *status)
+{
+        printk("SIO0 error[%04x]\n", *status);
+        do {
+                sio_init();
+        } while ((*status = __sio_in(PLD_ESIO0CR)) != 3);
+}
+
+#else /* not CONFIG_SERIAL_M32R_PLDSIO */
+
+#define __sio_in(x) inl(x)
+#define __sio_out(v,x) outl((v),(x))
+
+static inline void sio_set_baud_rate(unsigned long baud)
+{
+        unsigned long i, j;
+
+        i = boot_cpu_data.bus_clock / (baud * 16);
+        j = (boot_cpu_data.bus_clock - (i * baud * 16)) / baud;
+        i -= 1;
+        j = (j + 1) >> 1;
+
+        __sio_out(i, M32R_SIO0_BAUR_PORTL);
+        __sio_out(j, M32R_SIO0_RBAUR_PORTL);
+}
+
+static void sio_reset(void)
+{
+        __sio_out(0x00000300, M32R_SIO0_CR_PORTL);      /* init status */
+        __sio_out(0x00000800, M32R_SIO0_MOD1_PORTL);    /* 8bit        */
+        __sio_out(0x00000080, M32R_SIO0_MOD0_PORTL);    /* 1stop non   */
+        sio_set_baud_rate(BAUD_RATE);
+        __sio_out(0x00000000, M32R_SIO0_TRCR_PORTL);
+        __sio_out(0x00000003, M32R_SIO0_CR_PORTL);      /* RXCEN */
+}
+
+static void sio_init(void)
+{
+        unsigned int tmp;
+
+        tmp = __sio_in(M32R_SIO0_RXB_PORTL);
+        tmp = __sio_in(M32R_SIO0_RXB_PORTL);
+        tmp = __sio_in(M32R_SIO0_STS_PORTL);
+        __sio_out(0x00000003, M32R_SIO0_CR_PORTL);
+}
+
+static void sio_error(int *status)
+{
+        printk("SIO0 error[%04x]\n", *status);
+        do {
+                sio_init();
+        } while ((*status = __sio_in(M32R_SIO0_CR_PORTL)) != 3);
+}
+
+#endif /* CONFIG_SERIAL_M32R_PLDSIO */
+
+static unsigned int sio_in(struct uart_sio_port *up, int offset)
+{
+        return __sio_in(up->port.iobase + offset);
+}
+
+static void sio_out(struct uart_sio_port *up, int offset, int value)
+{
+        __sio_out(value, up->port.iobase + offset);
+}
+
+static unsigned int serial_in(struct uart_sio_port *up, int offset)
+{
+        if (!offset)
+                return 0;
+
+        return __sio_in(offset);
+}
+
+static void serial_out(struct uart_sio_port *up, int offset, int value)
+{
+        if (!offset)
+                return;
+
+        __sio_out(value, offset);
+}
+
+static void m32r_sio_stop_tx(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+
+        if (up->ier & UART_IER_THRI) {
+                up->ier &= ~UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+static void m32r_sio_start_tx(struct uart_port *port)
+{
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+        struct circ_buf *xmit = &up->port.state->xmit;
+
+        if (!(up->ier & UART_IER_THRI)) {
+                up->ier |= UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+                serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+        }
+        while((serial_in(up, UART_LSR) & UART_EMPTY) != UART_EMPTY);
+#else
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+
+        if (!(up->ier & UART_IER_THRI)) {
+                up->ier |= UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+#endif
+}
+
+static void m32r_sio_stop_rx(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+
+        up->ier &= ~UART_IER_RLSI;
+        up->port.read_status_mask &= ~UART_LSR_DR;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static void m32r_sio_enable_ms(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+
+        up->ier |= UART_IER_MSI;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static void receive_chars(struct uart_sio_port *up, int *status)
+{
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned char ch;
+        unsigned char flag;
+        int max_count = 256;
+
+        do {
+                ch = sio_in(up, SIORXB);
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+                                       UART_LSR_FE | UART_LSR_OE))) {
+                        /*
+                         * For statistics only
+                         */
+                        if (*status & UART_LSR_BI) {
+                                *status &= ~(UART_LSR_FE | UART_LSR_PE);
+                                up->port.icount.brk++;
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        goto ignore_char;
+                        } else if (*status & UART_LSR_PE)
+                                up->port.icount.parity++;
+                        else if (*status & UART_LSR_FE)
+                                up->port.icount.frame++;
+                        if (*status & UART_LSR_OE)
+                                up->port.icount.overrun++;
+
+                        /*
+                         * Mask off conditions which should be ingored.
+                         */
+                        *status &= up->port.read_status_mask;
+
+                        if (up->port.line == up->port.cons->index) {
+                                /* Recover the break flag from console xmit */
+                                *status |= up->lsr_break_flag;
+                                up->lsr_break_flag = 0;
+                        }
+
+                        if (*status & UART_LSR_BI) {
+                                DEBUG_INTR("handling break....");
+                                flag = TTY_BREAK;
+                        } else if (*status & UART_LSR_PE)
+                                flag = TTY_PARITY;
+                        else if (*status & UART_LSR_FE)
+                                flag = TTY_FRAME;
+                }
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        goto ignore_char;
+                if ((*status & up->port.ignore_status_mask) == 0)
+                        tty_insert_flip_char(tty, ch, flag);
+
+                if (*status & UART_LSR_OE) {
+                        /*
+                         * Overrun is special, since it's reported
+                         * immediately, and doesn't affect the current
+                         * character.
+                         */
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                }
+        ignore_char:
+                *status = serial_in(up, UART_LSR);
+        } while ((*status & UART_LSR_DR) && (max_count-- > 0));
+        tty_flip_buffer_push(tty);
+}
+
+static void transmit_chars(struct uart_sio_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int count;
+
+        if (up->port.x_char) {
+#ifndef CONFIG_SERIAL_M32R_PLDSIO       /* XXX */
+                serial_out(up, UART_TX, up->port.x_char);
+#endif
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+                m32r_sio_stop_tx(&up->port);
+                return;
+        }
+
+        count = up->port.fifosize;
+        do {
+                serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+                while (!(serial_in(up, UART_LSR) & UART_LSR_THRE));
+
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        DEBUG_INTR("THRE...");
+
+        if (uart_circ_empty(xmit))
+                m32r_sio_stop_tx(&up->port);
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static inline void m32r_sio_handle_port(struct uart_sio_port *up,
+        unsigned int status)
+{
+        DEBUG_INTR("status = %x...", status);
+
+        if (status & 0x04)
+                receive_chars(up, &status);
+        if (status & 0x01)
+                transmit_chars(up);
+}
+
+/*
+ * This is the serial driver's interrupt routine.
+ *
+ * Arjan thinks the old way was overly complex, so it got simplified.
+ * Alan disagrees, saying that need the complexity to handle the weird
+ * nature of ISA shared interrupts.  (This is a special exception.)
+ *
+ * In order to handle ISA shared interrupts properly, we need to check
+ * that all ports have been serviced, and therefore the ISA interrupt
+ * line has been de-asserted.
+ *
+ * This means we need to loop through all ports. checking that they
+ * don't have an interrupt pending.
+ */
+static irqreturn_t m32r_sio_interrupt(int irq, void *dev_id)
+{
+        struct irq_info *i = dev_id;
+        struct list_head *l, *end = NULL;
+        int pass_counter = 0;
+
+        DEBUG_INTR("m32r_sio_interrupt(%d)...", irq);
+
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+//      if (irq == PLD_IRQ_SIO0_SND)
+//              irq = PLD_IRQ_SIO0_RCV;
+#else
+        if (irq == M32R_IRQ_SIO0_S)
+                irq = M32R_IRQ_SIO0_R;
+#endif
+
+        spin_lock(&i->lock);
+
+        l = i->head;
+        do {
+                struct uart_sio_port *up;
+                unsigned int sts;
+
+                up = list_entry(l, struct uart_sio_port, list);
+
+                sts = sio_in(up, SIOSTS);
+                if (sts & 0x5) {
+                        spin_lock(&up->port.lock);
+                        m32r_sio_handle_port(up, sts);
+                        spin_unlock(&up->port.lock);
+
+                        end = NULL;
+                } else if (end == NULL)
+                        end = l;
+
+                l = l->next;
+
+                if (l == i->head && pass_counter++ > PASS_LIMIT) {
+                        if (sts & 0xe0)
+                                sio_error(&sts);
+                        break;
+                }
+        } while (l != end);
+
+        spin_unlock(&i->lock);
+
+        DEBUG_INTR("end.\n");
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * To support ISA shared interrupts, we need to have one interrupt
+ * handler that ensures that the IRQ line has been deasserted
+ * before returning.  Failing to do this will result in the IRQ
+ * line being stuck active, and, since ISA irqs are edge triggered,
+ * no more IRQs will be seen.
+ */
+static void serial_do_unlink(struct irq_info *i, struct uart_sio_port *up)
+{
+        spin_lock_irq(&i->lock);
+
+        if (!list_empty(i->head)) {
+                if (i->head == &up->list)
+                        i->head = i->head->next;
+                list_del(&up->list);
+        } else {
+                BUG_ON(i->head != &up->list);
+                i->head = NULL;
+        }
+
+        spin_unlock_irq(&i->lock);
+}
+
+static int serial_link_irq_chain(struct uart_sio_port *up)
+{
+        struct irq_info *i = irq_lists + up->port.irq;
+        int ret, irq_flags = 0;
+
+        spin_lock_irq(&i->lock);
+
+        if (i->head) {
+                list_add(&up->list, i->head);
+                spin_unlock_irq(&i->lock);
+
+                ret = 0;
+        } else {
+                INIT_LIST_HEAD(&up->list);
+                i->head = &up->list;
+                spin_unlock_irq(&i->lock);
+
+                ret = request_irq(up->port.irq, m32r_sio_interrupt,
+                                  irq_flags, "SIO0-RX", i);
+                ret |= request_irq(up->port.irq + 1, m32r_sio_interrupt,
+                                  irq_flags, "SIO0-TX", i);
+                if (ret < 0)
+                        serial_do_unlink(i, up);
+        }
+
+        return ret;
+}
+
+static void serial_unlink_irq_chain(struct uart_sio_port *up)
+{
+        struct irq_info *i = irq_lists + up->port.irq;
+
+        BUG_ON(i->head == NULL);
+
+        if (list_empty(i->head)) {
+                free_irq(up->port.irq, i);
+                free_irq(up->port.irq + 1, i);
+        }
+
+        serial_do_unlink(i, up);
+}
+
+/*
+ * This function is used to handle ports that do not have an interrupt.
+ */
+static void m32r_sio_timeout(unsigned long data)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)data;
+        unsigned int timeout;
+        unsigned int sts;
+
+        sts = sio_in(up, SIOSTS);
+        if (sts & 0x5) {
+                spin_lock(&up->port.lock);
+                m32r_sio_handle_port(up, sts);
+                spin_unlock(&up->port.lock);
+        }
+
+        timeout = up->port.timeout;
+        timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
+        mod_timer(&up->timer, jiffies + timeout);
+}
+
+static unsigned int m32r_sio_tx_empty(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+        unsigned long flags;
+        unsigned int ret;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return ret;
+}
+
+static unsigned int m32r_sio_get_mctrl(struct uart_port *port)
+{
+        return 0;
+}
+
+static void m32r_sio_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+
+}
+
+static void m32r_sio_break_ctl(struct uart_port *port, int break_state)
+{
+
+}
+
+static int m32r_sio_startup(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+        int retval;
+
+        sio_init();
+
+        /*
+         * If the "interrupt" for this port doesn't correspond with any
+         * hardware interrupt, we use a timer-based system.  The original
+         * driver used to do this with IRQ0.
+         */
+        if (!is_real_interrupt(up->port.irq)) {
+                unsigned int timeout = up->port.timeout;
+
+                timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
+
+                up->timer.data = (unsigned long)up;
+                mod_timer(&up->timer, jiffies + timeout);
+        } else {
+                retval = serial_link_irq_chain(up);
+                if (retval)
+                        return retval;
+        }
+
+        /*
+         * Finally, enable interrupts.  Note: Modem status interrupts
+         * are set via set_termios(), which will be occurring imminently
+         * anyway, so we don't enable them here.
+         * - M32R_SIO: 0x0c
+         * - M32R_PLDSIO: 0x04
+         */
+        up->ier = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
+        sio_out(up, SIOTRCR, up->ier);
+
+        /*
+         * And clear the interrupt registers again for luck.
+         */
+        sio_reset();
+
+        return 0;
+}
+
+static void m32r_sio_shutdown(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+
+        /*
+         * Disable interrupts from this port
+         */
+        up->ier = 0;
+        sio_out(up, SIOTRCR, 0);
+
+        /*
+         * Disable break condition and FIFOs
+         */
+
+        sio_init();
+
+        if (!is_real_interrupt(up->port.irq))
+                del_timer_sync(&up->timer);
+        else
+                serial_unlink_irq_chain(up);
+}
+
+static unsigned int m32r_sio_get_divisor(struct uart_port *port,
+        unsigned int baud)
+{
+        return uart_get_divisor(port, baud);
+}
+
+static void m32r_sio_set_termios(struct uart_port *port,
+        struct ktermios *termios, struct ktermios *old)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+        unsigned char cval = 0;
+        unsigned long flags;
+        unsigned int baud, quot;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                cval = UART_LCR_WLEN5;
+                break;
+        case CS6:
+                cval = UART_LCR_WLEN6;
+                break;
+        case CS7:
+                cval = UART_LCR_WLEN7;
+                break;
+        default:
+        case CS8:
+                cval = UART_LCR_WLEN8;
+                break;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                cval |= UART_LCR_STOP;
+        if (termios->c_cflag & PARENB)
+                cval |= UART_LCR_PARITY;
+        if (!(termios->c_cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+        if (termios->c_cflag & CMSPAR)
+                cval |= UART_LCR_SPAR;
+#endif
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/4);
+#else
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+#endif
+        quot = m32r_sio_get_divisor(port, baud);
+
+        /*
+         * Ok, we're now changing the port state.  Do it with
+         * interrupts disabled.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        sio_set_baud_rate(baud);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+        if (termios->c_iflag & INPCK)
+                up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= UART_LSR_BI;
+
+        /*
+         * Characteres to ignore
+         */
+        up->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+        if (termios->c_iflag & IGNBRK) {
+                up->port.ignore_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        up->port.ignore_status_mask |= UART_LSR_OE;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= UART_LSR_DR;
+
+        /*
+         * CTS flow control flag and modem status interrupts
+         */
+        up->ier &= ~UART_IER_MSI;
+        if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+                up->ier |= UART_IER_MSI;
+
+        serial_out(up, UART_IER, up->ier);
+
+        up->lcr = cval;                                 /* Save LCR */
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void m32r_sio_pm(struct uart_port *port, unsigned int state,
+        unsigned int oldstate)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+
+        if (up->pm)
+                up->pm(port, state, oldstate);
+}
+
+/*
+ * Resource handling.  This is complicated by the fact that resources
+ * depend on the port type.  Maybe we should be claiming the standard
+ * 8250 ports, and then trying to get other resources as necessary?
+ */
+static int
+m32r_sio_request_std_resource(struct uart_sio_port *up, struct resource **res)
+{
+        unsigned int size = 8 << up->port.regshift;
+#ifndef CONFIG_SERIAL_M32R_PLDSIO
+        unsigned long start;
+#endif
+        int ret = 0;
+
+        switch (up->port.iotype) {
+        case UPIO_MEM:
+                if (up->port.mapbase) {
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+                        *res = request_mem_region(up->port.mapbase, size, "serial");
+#else
+                        start = up->port.mapbase;
+                        *res = request_mem_region(start, size, "serial");
+#endif
+                        if (!*res)
+                                ret = -EBUSY;
+                }
+                break;
+
+        case UPIO_PORT:
+                *res = request_region(up->port.iobase, size, "serial");
+                if (!*res)
+                        ret = -EBUSY;
+                break;
+        }
+        return ret;
+}
+
+static void m32r_sio_release_port(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+        unsigned long start, offset = 0, size = 0;
+
+        size <<= up->port.regshift;
+
+        switch (up->port.iotype) {
+        case UPIO_MEM:
+                if (up->port.mapbase) {
+                        /*
+                         * Unmap the area.
+                         */
+                        iounmap(up->port.membase);
+                        up->port.membase = NULL;
+
+                        start = up->port.mapbase;
+
+                        if (size)
+                                release_mem_region(start + offset, size);
+                        release_mem_region(start, 8 << up->port.regshift);
+                }
+                break;
+
+        case UPIO_PORT:
+                start = up->port.iobase;
+
+                if (size)
+                        release_region(start + offset, size);
+                release_region(start + offset, 8 << up->port.regshift);
+                break;
+
+        default:
+                break;
+        }
+}
+
+static int m32r_sio_request_port(struct uart_port *port)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+        struct resource *res = NULL;
+        int ret = 0;
+
+        ret = m32r_sio_request_std_resource(up, &res);
+
+        /*
+         * If we have a mapbase, then request that as well.
+         */
+        if (ret == 0 && up->port.flags & UPF_IOREMAP) {
+                int size = res->end - res->start + 1;
+
+                up->port.membase = ioremap(up->port.mapbase, size);
+                if (!up->port.membase)
+                        ret = -ENOMEM;
+        }
+
+        if (ret < 0) {
+                if (res)
+                        release_resource(res);
+        }
+
+        return ret;
+}
+
+static void m32r_sio_config_port(struct uart_port *port, int unused)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        up->port.type = (PORT_M32R_SIO - PORT_M32R_BASE + 1);
+        up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int
+m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        if (ser->irq >= nr_irqs || ser->irq < 0 ||
+            ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
+            ser->type >= ARRAY_SIZE(uart_config))
+                return -EINVAL;
+        return 0;
+}
+
+static const char *
+m32r_sio_type(struct uart_port *port)
+{
+        int type = port->type;
+
+        if (type >= ARRAY_SIZE(uart_config))
+                type = 0;
+        return uart_config[type].name;
+}
+
+static struct uart_ops m32r_sio_pops = {
+        .tx_empty       = m32r_sio_tx_empty,
+        .set_mctrl      = m32r_sio_set_mctrl,
+        .get_mctrl      = m32r_sio_get_mctrl,
+        .stop_tx        = m32r_sio_stop_tx,
+        .start_tx       = m32r_sio_start_tx,
+        .stop_rx        = m32r_sio_stop_rx,
+        .enable_ms      = m32r_sio_enable_ms,
+        .break_ctl      = m32r_sio_break_ctl,
+        .startup        = m32r_sio_startup,
+        .shutdown       = m32r_sio_shutdown,
+        .set_termios    = m32r_sio_set_termios,
+        .pm             = m32r_sio_pm,
+        .type           = m32r_sio_type,
+        .release_port   = m32r_sio_release_port,
+        .request_port   = m32r_sio_request_port,
+        .config_port    = m32r_sio_config_port,
+        .verify_port    = m32r_sio_verify_port,
+};
+
+static struct uart_sio_port m32r_sio_ports[UART_NR];
+
+static void __init m32r_sio_init_ports(void)
+{
+        struct uart_sio_port *up;
+        static int first = 1;
+        int i;
+
+        if (!first)
+                return;
+        first = 0;
+
+        for (i = 0, up = m32r_sio_ports; i < ARRAY_SIZE(old_serial_port);
+             i++, up++) {
+                up->port.iobase   = old_serial_port[i].port;
+                up->port.irq      = irq_canonicalize(old_serial_port[i].irq);
+                up->port.uartclk  = old_serial_port[i].baud_base * 16;
+                up->port.flags    = old_serial_port[i].flags;
+                up->port.membase  = old_serial_port[i].iomem_base;
+                up->port.iotype   = old_serial_port[i].io_type;
+                up->port.regshift = old_serial_port[i].iomem_reg_shift;
+                up->port.ops      = &m32r_sio_pops;
+        }
+}
+
+static void __init m32r_sio_register_ports(struct uart_driver *drv)
+{
+        int i;
+
+        m32r_sio_init_ports();
+
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_sio_port *up = &m32r_sio_ports[i];
+
+                up->port.line = i;
+                up->port.ops = &m32r_sio_pops;
+                init_timer(&up->timer);
+                up->timer.function = m32r_sio_timeout;
+
+                /*
+                 * ALPHA_KLUDGE_MCR needs to be killed.
+                 */
+                up->mcr_mask = ~ALPHA_KLUDGE_MCR;
+                up->mcr_force = ALPHA_KLUDGE_MCR;
+
+                uart_add_one_port(drv, &up->port);
+        }
+}
+
+#ifdef CONFIG_SERIAL_M32R_SIO_CONSOLE
+
+/*
+ *      Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct uart_sio_port *up)
+{
+        unsigned int status, tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        do {
+                status = sio_in(up, SIOSTS);
+
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while ((status & UART_EMPTY) != UART_EMPTY);
+
+        /* Wait up to 1s for flow control if necessary */
+        if (up->port.flags & UPF_CONS_FLOW) {
+                tmout = 1000000;
+                while (--tmout)
+                        udelay(1);
+        }
+}
+
+static void m32r_sio_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_sio_port *up = (struct uart_sio_port *)port;
+
+        wait_for_xmitr(up);
+        sio_out(up, SIOTXB, ch);
+}
+
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ *
+ *      The console_lock must be held when we get here.
+ */
+static void m32r_sio_console_write(struct console *co, const char *s,
+        unsigned int count)
+{
+        struct uart_sio_port *up = &m32r_sio_ports[co->index];
+        unsigned int ier;
+
+        /*
+         *      First save the UER then disable the interrupts
+         */
+        ier = sio_in(up, SIOTRCR);
+        sio_out(up, SIOTRCR, 0);
+
+        uart_console_write(&up->port, s, count, m32r_sio_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the IER
+         */
+        wait_for_xmitr(up);
+        sio_out(up, SIOTRCR, ier);
+}
+
+static int __init m32r_sio_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= UART_NR)
+                co->index = 0;
+        port = &m32r_sio_ports[co->index].port;
+
+        /*
+         * Temporary fix.
+         */
+        spin_lock_init(&port->lock);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver m32r_sio_reg;
+static struct console m32r_sio_console = {
+        .name           = "ttyS",
+        .write          = m32r_sio_console_write,
+        .device         = uart_console_device,
+        .setup          = m32r_sio_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &m32r_sio_reg,
+};
+
+static int __init m32r_sio_console_init(void)
+{
+        sio_reset();
+        sio_init();
+        m32r_sio_init_ports();
+        register_console(&m32r_sio_console);
+        return 0;
+}
+console_initcall(m32r_sio_console_init);
+
+#define M32R_SIO_CONSOLE        &m32r_sio_console
+#else
+#define M32R_SIO_CONSOLE        NULL
+#endif
+
+static struct uart_driver m32r_sio_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "sio",
+        .dev_name               = "ttyS",
+        .major                  = TTY_MAJOR,
+        .minor                  = 64,
+        .nr                     = UART_NR,
+        .cons                   = M32R_SIO_CONSOLE,
+};
+
+/**
+ *      m32r_sio_suspend_port - suspend one serial port
+ *      @line: serial line number
+ *
+ *      Suspend one serial port.
+ */
+void m32r_sio_suspend_port(int line)
+{
+        uart_suspend_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
+}
+
+/**
+ *      m32r_sio_resume_port - resume one serial port
+ *      @line: serial line number
+ *
+ *      Resume one serial port.
+ */
+void m32r_sio_resume_port(int line)
+{
+        uart_resume_port(&m32r_sio_reg, &m32r_sio_ports[line].port);
+}
+
+static int __init m32r_sio_init(void)
+{
+        int ret, i;
+
+        printk(KERN_INFO "Serial: M32R SIO driver\n");
+
+        for (i = 0; i < nr_irqs; i++)
+                spin_lock_init(&irq_lists[i].lock);
+
+        ret = uart_register_driver(&m32r_sio_reg);
+        if (ret >= 0)
+                m32r_sio_register_ports(&m32r_sio_reg);
+
+        return ret;
+}
+
+static void __exit m32r_sio_exit(void)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++)
+                uart_remove_one_port(&m32r_sio_reg, &m32r_sio_ports[i].port);
+
+        uart_unregister_driver(&m32r_sio_reg);
+}
+
+module_init(m32r_sio_init);
+module_exit(m32r_sio_exit);
+
+EXPORT_SYMBOL(m32r_sio_suspend_port);
+EXPORT_SYMBOL(m32r_sio_resume_port);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic M32R SIO serial driver");
diff --git a/drivers/tty/serial/m32r_sio.h b/drivers/tty/serial/m32r_sio.h
new file mode 100644
index 000000000000..e9b7e11793b1
--- /dev/null
+++ b/drivers/tty/serial/m32r_sio.h
@@ -0,0 +1,48 @@
+/*
+ *  m32r_sio.h
+ *
+ *  Driver for M32R serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *  Based on drivers/serial/8250.h.
+ *
+ *  Copyright (C) 2001  Russell King.
+ *  Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+struct m32r_sio_probe {
+        struct module   *owner;
+        int             (*pci_init_one)(struct pci_dev *dev);
+        void            (*pci_remove_one)(struct pci_dev *dev);
+        void            (*pnp_init)(void);
+};
+
+int m32r_sio_register_probe(struct m32r_sio_probe *probe);
+void m32r_sio_unregister_probe(struct m32r_sio_probe *probe);
+void m32r_sio_get_irq_map(unsigned int *map);
+void m32r_sio_suspend_port(int line);
+void m32r_sio_resume_port(int line);
+
+struct old_serial_port {
+        unsigned int uart;
+        unsigned int baud_base;
+        unsigned int port;
+        unsigned int irq;
+        unsigned int flags;
+        unsigned char io_type;
+        unsigned char __iomem *iomem_base;
+        unsigned short iomem_reg_shift;
+};
+
+#define _INLINE_ inline
+
+#define PROBE_RSA       (1 << 0)
+#define PROBE_ANY       (~0)
+
+#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
diff --git a/drivers/tty/serial/m32r_sio_reg.h b/drivers/tty/serial/m32r_sio_reg.h
new file mode 100644
index 000000000000..4671473793e3
--- /dev/null
+++ b/drivers/tty/serial/m32r_sio_reg.h
@@ -0,0 +1,152 @@
+/*
+ * m32r_sio_reg.h
+ *
+ * Copyright (C) 1992, 1994 by Theodore Ts'o.
+ * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
+ *
+ * Redistribution of this file is permitted under the terms of the GNU
+ * Public License (GPL)
+ *
+ * These are the UART port assignments, expressed as offsets from the base
+ * register.  These assignments should hold for any serial port based on
+ * a 8250, 16450, or 16550(A).
+ */
+
+#ifndef _M32R_SIO_REG_H
+#define _M32R_SIO_REG_H
+
+
+#ifdef CONFIG_SERIAL_M32R_PLDSIO
+
+#define SIOCR           0x000
+#define SIOMOD0         0x002
+#define SIOMOD1         0x004
+#define SIOSTS          0x006
+#define SIOTRCR         0x008
+#define SIOBAUR         0x00a
+// #define SIORBAUR     0x018
+#define SIOTXB          0x00c
+#define SIORXB          0x00e
+
+#define UART_RX         ((unsigned long) PLD_ESIO0RXB)
+                                /* In:  Receive buffer (DLAB=0) */
+#define UART_TX         ((unsigned long) PLD_ESIO0TXB)
+                                /* Out: Transmit buffer (DLAB=0) */
+#define UART_DLL        0       /* Out: Divisor Latch Low (DLAB=1) */
+#define UART_TRG        0       /* (LCR=BF) FCTR bit 7 selects Rx or Tx
+                                 * In: Fifo count
+                                 * Out: Fifo custom trigger levels
+                                 * XR16C85x only */
+
+#define UART_DLM        0       /* Out: Divisor Latch High (DLAB=1) */
+#define UART_IER        ((unsigned long) PLD_ESIO0INTCR)
+                                /* Out: Interrupt Enable Register */
+#define UART_FCTR       0       /* (LCR=BF) Feature Control Register
+                                 * XR16C85x only */
+
+#define UART_IIR        0       /* In:  Interrupt ID Register */
+#define UART_FCR        0       /* Out: FIFO Control Register */
+#define UART_EFR        0       /* I/O: Extended Features Register */
+                                /* (DLAB=1, 16C660 only) */
+
+#define UART_LCR        0       /* Out: Line Control Register */
+#define UART_MCR        0       /* Out: Modem Control Register */
+#define UART_LSR        ((unsigned long) PLD_ESIO0STS)
+                                /* In:  Line Status Register */
+#define UART_MSR        0       /* In:  Modem Status Register */
+#define UART_SCR        0       /* I/O: Scratch Register */
+#define UART_EMSR       0       /* (LCR=BF) Extended Mode Select Register
+                                 * FCTR bit 6 selects SCR or EMSR
+                                 * XR16c85x only */
+
+#else /* not CONFIG_SERIAL_M32R_PLDSIO */
+
+#define SIOCR           0x000
+#define SIOMOD0         0x004
+#define SIOMOD1         0x008
+#define SIOSTS          0x00c
+#define SIOTRCR         0x010
+#define SIOBAUR         0x014
+#define SIORBAUR        0x018
+#define SIOTXB          0x01c
+#define SIORXB          0x020
+
+#define UART_RX         M32R_SIO0_RXB_PORTL     /* In:  Receive buffer (DLAB=0) */
+#define UART_TX         M32R_SIO0_TXB_PORTL     /* Out: Transmit buffer (DLAB=0) */
+#define UART_DLL        0       /* Out: Divisor Latch Low (DLAB=1) */
+#define UART_TRG        0       /* (LCR=BF) FCTR bit 7 selects Rx or Tx
+                                 * In: Fifo count
+                                 * Out: Fifo custom trigger levels
+                                 * XR16C85x only */
+
+#define UART_DLM        0       /* Out: Divisor Latch High (DLAB=1) */
+#define UART_IER        M32R_SIO0_TRCR_PORTL    /* Out: Interrupt Enable Register */
+#define UART_FCTR       0       /* (LCR=BF) Feature Control Register
+                                 * XR16C85x only */
+
+#define UART_IIR        0       /* In:  Interrupt ID Register */
+#define UART_FCR        0       /* Out: FIFO Control Register */
+#define UART_EFR        0       /* I/O: Extended Features Register */
+                                /* (DLAB=1, 16C660 only) */
+
+#define UART_LCR        0       /* Out: Line Control Register */
+#define UART_MCR        0       /* Out: Modem Control Register */
+#define UART_LSR        M32R_SIO0_STS_PORTL     /* In:  Line Status Register */
+#define UART_MSR        0       /* In:  Modem Status Register */
+#define UART_SCR        0       /* I/O: Scratch Register */
+#define UART_EMSR       0       /* (LCR=BF) Extended Mode Select Register
+                                 * FCTR bit 6 selects SCR or EMSR
+                                 * XR16c85x only */
+
+#endif /* CONFIG_SERIAL_M32R_PLDSIO */
+
+#define UART_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
+
+/*
+ * These are the definitions for the Line Control Register
+ *
+ * Note: if the word length is 5 bits (UART_LCR_WLEN5), then setting
+ * UART_LCR_STOP will select 1.5 stop bits, not 2 stop bits.
+ */
+#define UART_LCR_DLAB   0x80    /* Divisor latch access bit */
+#define UART_LCR_SBC    0x40    /* Set break control */
+#define UART_LCR_SPAR   0x20    /* Stick parity (?) */
+#define UART_LCR_EPAR   0x10    /* Even parity select */
+#define UART_LCR_PARITY 0x08    /* Parity Enable */
+#define UART_LCR_STOP   0x04    /* Stop bits: 0=1 stop bit, 1= 2 stop bits */
+#define UART_LCR_WLEN5  0x00    /* Wordlength: 5 bits */
+#define UART_LCR_WLEN6  0x01    /* Wordlength: 6 bits */
+#define UART_LCR_WLEN7  0x02    /* Wordlength: 7 bits */
+#define UART_LCR_WLEN8  0x03    /* Wordlength: 8 bits */
+
+/*
+ * These are the definitions for the Line Status Register
+ */
+#define UART_LSR_TEMT   0x02    /* Transmitter empty */
+#define UART_LSR_THRE   0x01    /* Transmit-hold-register empty */
+#define UART_LSR_BI     0x00    /* Break interrupt indicator */
+#define UART_LSR_FE     0x80    /* Frame error indicator */
+#define UART_LSR_PE     0x40    /* Parity error indicator */
+#define UART_LSR_OE     0x20    /* Overrun error indicator */
+#define UART_LSR_DR     0x04    /* Receiver data ready */
+
+/*
+ * These are the definitions for the Interrupt Identification Register
+ */
+#define UART_IIR_NO_INT 0x01    /* No interrupts pending */
+#define UART_IIR_ID     0x06    /* Mask for the interrupt ID */
+
+#define UART_IIR_MSI    0x00    /* Modem status interrupt */
+#define UART_IIR_THRI   0x02    /* Transmitter holding register empty */
+#define UART_IIR_RDI    0x04    /* Receiver data interrupt */
+#define UART_IIR_RLSI   0x06    /* Receiver line status interrupt */
+
+/*
+ * These are the definitions for the Interrupt Enable Register
+ */
+#define UART_IER_MSI    0x00    /* Enable Modem status interrupt */
+#define UART_IER_RLSI   0x08    /* Enable receiver line status interrupt */
+#define UART_IER_THRI   0x03    /* Enable Transmitter holding register int. */
+#define UART_IER_RDI    0x04    /* Enable receiver data interrupt */
+
+#endif /* _M32R_SIO_REG_H */
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
new file mode 100644
index 000000000000..7b951adac54b
--- /dev/null
+++ b/drivers/tty/serial/max3100.c
@@ -0,0 +1,926 @@
+/*
+ *
+ *  Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ *
+ * Notes: the MAX3100 doesn't provide an interrupt on CTS so we have
+ * to use polling for flow control. TX empty IRQ is unusable, since
+ * writing conf clears FIFO buffer and we cannot have this interrupt
+ * always asking us for attention.
+ *
+ * Example platform data:
+
+ static struct plat_max3100 max3100_plat_data = {
+ .loopback = 0,
+ .crystal = 0,
+ .poll_time = 100,
+ };
+
+ static struct spi_board_info spi_board_info[] = {
+ {
+ .modalias      = "max3100",
+ .platform_data = &max3100_plat_data,
+ .irq           = IRQ_EINT12,
+ .max_speed_hz  = 5*1000*1000,
+ .chip_select   = 0,
+ },
+ };
+
+ * The initial minor number is 209 in the low-density serial port:
+ * mknod /dev/ttyMAX0 c 204 209
+ */
+
+#define MAX3100_MAJOR 204
+#define MAX3100_MINOR 209
+/* 4 MAX3100s should be enough for everyone */
+#define MAX_MAX3100 4
+
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/spi/spi.h>
+#include <linux/freezer.h>
+
+#include <linux/serial_max3100.h>
+
+#define MAX3100_C    (1<<14)
+#define MAX3100_D    (0<<14)
+#define MAX3100_W    (1<<15)
+#define MAX3100_RX   (0<<15)
+
+#define MAX3100_WC   (MAX3100_W  | MAX3100_C)
+#define MAX3100_RC   (MAX3100_RX | MAX3100_C)
+#define MAX3100_WD   (MAX3100_W  | MAX3100_D)
+#define MAX3100_RD   (MAX3100_RX | MAX3100_D)
+#define MAX3100_CMD  (3 << 14)
+
+#define MAX3100_T    (1<<14)
+#define MAX3100_R    (1<<15)
+
+#define MAX3100_FEN  (1<<13)
+#define MAX3100_SHDN (1<<12)
+#define MAX3100_TM   (1<<11)
+#define MAX3100_RM   (1<<10)
+#define MAX3100_PM   (1<<9)
+#define MAX3100_RAM  (1<<8)
+#define MAX3100_IR   (1<<7)
+#define MAX3100_ST   (1<<6)
+#define MAX3100_PE   (1<<5)
+#define MAX3100_L    (1<<4)
+#define MAX3100_BAUD (0xf)
+
+#define MAX3100_TE   (1<<10)
+#define MAX3100_RAFE (1<<10)
+#define MAX3100_RTS  (1<<9)
+#define MAX3100_CTS  (1<<9)
+#define MAX3100_PT   (1<<8)
+#define MAX3100_DATA (0xff)
+
+#define MAX3100_RT   (MAX3100_R | MAX3100_T)
+#define MAX3100_RTC  (MAX3100_RT | MAX3100_CTS | MAX3100_RAFE)
+
+/* the following simulate a status reg for ignore_status_mask */
+#define MAX3100_STATUS_PE 1
+#define MAX3100_STATUS_FE 2
+#define MAX3100_STATUS_OE 4
+
+struct max3100_port {
+        struct uart_port port;
+        struct spi_device *spi;
+
+        int cts;                /* last CTS received for flow ctrl */
+        int tx_empty;           /* last TX empty bit */
+
+        spinlock_t conf_lock;   /* shared data */
+        int conf_commit;        /* need to make changes */
+        int conf;               /* configuration for the MAX31000
+                                 * (bits 0-7, bits 8-11 are irqs) */
+        int rts_commit;         /* need to change rts */
+        int rts;                /* rts status */
+        int baud;               /* current baud rate */
+
+        int parity;             /* keeps track if we should send parity */
+#define MAX3100_PARITY_ON 1
+#define MAX3100_PARITY_ODD 2
+#define MAX3100_7BIT 4
+        int rx_enabled;         /* if we should rx chars */
+
+        int irq;                /* irq assigned to the max3100 */
+
+        int minor;              /* minor number */
+        int crystal;            /* 1 if 3.6864Mhz crystal 0 for 1.8432 */
+        int loopback;           /* 1 if we are in loopback mode */
+
+        /* for handling irqs: need workqueue since we do spi_sync */
+        struct workqueue_struct *workqueue;
+        struct work_struct work;
+        /* set to 1 to make the workhandler exit as soon as possible */
+        int  force_end_work;
+        /* need to know we are suspending to avoid deadlock on workqueue */
+        int suspending;
+
+        /* hook for suspending MAX3100 via dedicated pin */
+        void (*max3100_hw_suspend) (int suspend);
+
+        /* poll time (in ms) for ctrl lines */
+        int poll_time;
+        /* and its timer */
+        struct timer_list       timer;
+};
+
+static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */
+static DEFINE_MUTEX(max3100s_lock);                /* race on probe */
+
+static int max3100_do_parity(struct max3100_port *s, u16 c)
+{
+        int parity;
+
+        if (s->parity & MAX3100_PARITY_ODD)
+                parity = 1;
+        else
+                parity = 0;
+
+        if (s->parity & MAX3100_7BIT)
+                c &= 0x7f;
+        else
+                c &= 0xff;
+
+        parity = parity ^ (hweight8(c) & 1);
+        return parity;
+}
+
+static int max3100_check_parity(struct max3100_port *s, u16 c)
+{
+        return max3100_do_parity(s, c) == ((c >> 8) & 1);
+}
+
+static void max3100_calc_parity(struct max3100_port *s, u16 *c)
+{
+        if (s->parity & MAX3100_7BIT)
+                *c &= 0x7f;
+        else
+                *c &= 0xff;
+
+        if (s->parity & MAX3100_PARITY_ON)
+                *c |= max3100_do_parity(s, *c) << 8;
+}
+
+static void max3100_work(struct work_struct *w);
+
+static void max3100_dowork(struct max3100_port *s)
+{
+        if (!s->force_end_work && !work_pending(&s->work) &&
+            !freezing(current) && !s->suspending)
+                queue_work(s->workqueue, &s->work);
+}
+
+static void max3100_timeout(unsigned long data)
+{
+        struct max3100_port *s = (struct max3100_port *)data;
+
+        if (s->port.state) {
+                max3100_dowork(s);
+                mod_timer(&s->timer, jiffies + s->poll_time);
+        }
+}
+
+static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx)
+{
+        struct spi_message message;
+        u16 etx, erx;
+        int status;
+        struct spi_transfer tran = {
+                .tx_buf = &etx,
+                .rx_buf = &erx,
+                .len = 2,
+        };
+
+        etx = cpu_to_be16(tx);
+        spi_message_init(&message);
+        spi_message_add_tail(&tran, &message);
+        status = spi_sync(s->spi, &message);
+        if (status) {
+                dev_warn(&s->spi->dev, "error while calling spi_sync\n");
+                return -EIO;
+        }
+        *rx = be16_to_cpu(erx);
+        s->tx_empty = (*rx & MAX3100_T) > 0;
+        dev_dbg(&s->spi->dev, "%04x - %04x\n", tx, *rx);
+        return 0;
+}
+
+static int max3100_handlerx(struct max3100_port *s, u16 rx)
+{
+        unsigned int ch, flg, status = 0;
+        int ret = 0, cts;
+
+        if (rx & MAX3100_R && s->rx_enabled) {
+                dev_dbg(&s->spi->dev, "%s\n", __func__);
+                ch = rx & (s->parity & MAX3100_7BIT ? 0x7f : 0xff);
+                if (rx & MAX3100_RAFE) {
+                        s->port.icount.frame++;
+                        flg = TTY_FRAME;
+                        status |= MAX3100_STATUS_FE;
+                } else {
+                        if (s->parity & MAX3100_PARITY_ON) {
+                                if (max3100_check_parity(s, rx)) {
+                                        s->port.icount.rx++;
+                                        flg = TTY_NORMAL;
+                                } else {
+                                        s->port.icount.parity++;
+                                        flg = TTY_PARITY;
+                                        status |= MAX3100_STATUS_PE;
+                                }
+                        } else {
+                                s->port.icount.rx++;
+                                flg = TTY_NORMAL;
+                        }
+                }
+                uart_insert_char(&s->port, status, MAX3100_STATUS_OE, ch, flg);
+                ret = 1;
+        }
+
+        cts = (rx & MAX3100_CTS) > 0;
+        if (s->cts != cts) {
+                s->cts = cts;
+                uart_handle_cts_change(&s->port, cts ? TIOCM_CTS : 0);
+        }
+
+        return ret;
+}
+
+static void max3100_work(struct work_struct *w)
+{
+        struct max3100_port *s = container_of(w, struct max3100_port, work);
+        int rxchars;
+        u16 tx, rx;
+        int conf, cconf, rts, crts;
+        struct circ_buf *xmit = &s->port.state->xmit;
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        rxchars = 0;
+        do {
+                spin_lock(&s->conf_lock);
+                conf = s->conf;
+                cconf = s->conf_commit;
+                s->conf_commit = 0;
+                rts = s->rts;
+                crts = s->rts_commit;
+                s->rts_commit = 0;
+                spin_unlock(&s->conf_lock);
+                if (cconf)
+                        max3100_sr(s, MAX3100_WC | conf, &rx);
+                if (crts) {
+                        max3100_sr(s, MAX3100_WD | MAX3100_TE |
+                                   (s->rts ? MAX3100_RTS : 0), &rx);
+                        rxchars += max3100_handlerx(s, rx);
+                }
+
+                max3100_sr(s, MAX3100_RD, &rx);
+                rxchars += max3100_handlerx(s, rx);
+
+                if (rx & MAX3100_T) {
+                        tx = 0xffff;
+                        if (s->port.x_char) {
+                                tx = s->port.x_char;
+                                s->port.icount.tx++;
+                                s->port.x_char = 0;
+                        } else if (!uart_circ_empty(xmit) &&
+                                   !uart_tx_stopped(&s->port)) {
+                                tx = xmit->buf[xmit->tail];
+                                xmit->tail = (xmit->tail + 1) &
+                                        (UART_XMIT_SIZE - 1);
+                                s->port.icount.tx++;
+                        }
+                        if (tx != 0xffff) {
+                                max3100_calc_parity(s, &tx);
+                                tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0);
+                                max3100_sr(s, tx, &rx);
+                                rxchars += max3100_handlerx(s, rx);
+                        }
+                }
+
+                if (rxchars > 16 && s->port.state->port.tty != NULL) {
+                        tty_flip_buffer_push(s->port.state->port.tty);
+                        rxchars = 0;
+                }
+                if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                        uart_write_wakeup(&s->port);
+
+        } while (!s->force_end_work &&
+                 !freezing(current) &&
+                 ((rx & MAX3100_R) ||
+                  (!uart_circ_empty(xmit) &&
+                   !uart_tx_stopped(&s->port))));
+
+        if (rxchars > 0 && s->port.state->port.tty != NULL)
+                tty_flip_buffer_push(s->port.state->port.tty);
+}
+
+static irqreturn_t max3100_irq(int irqno, void *dev_id)
+{
+        struct max3100_port *s = dev_id;
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        max3100_dowork(s);
+        return IRQ_HANDLED;
+}
+
+static void max3100_enable_ms(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        if (s->poll_time > 0)
+                mod_timer(&s->timer, jiffies);
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+}
+
+static void max3100_start_tx(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        max3100_dowork(s);
+}
+
+static void max3100_stop_rx(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        s->rx_enabled = 0;
+        spin_lock(&s->conf_lock);
+        s->conf &= ~MAX3100_RM;
+        s->conf_commit = 1;
+        spin_unlock(&s->conf_lock);
+        max3100_dowork(s);
+}
+
+static unsigned int max3100_tx_empty(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        /* may not be truly up-to-date */
+        max3100_dowork(s);
+        return s->tx_empty;
+}
+
+static unsigned int max3100_get_mctrl(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        /* may not be truly up-to-date */
+        max3100_dowork(s);
+        /* always assert DCD and DSR since these lines are not wired */
+        return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+        int rts;
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        rts = (mctrl & TIOCM_RTS) > 0;
+
+        spin_lock(&s->conf_lock);
+        if (s->rts != rts) {
+                s->rts = rts;
+                s->rts_commit = 1;
+                max3100_dowork(s);
+        }
+        spin_unlock(&s->conf_lock);
+}
+
+static void
+max3100_set_termios(struct uart_port *port, struct ktermios *termios,
+                    struct ktermios *old)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+        int baud = 0;
+        unsigned cflag;
+        u32 param_new, param_mask, parity = 0;
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        cflag = termios->c_cflag;
+        param_new = 0;
+        param_mask = 0;
+
+        baud = tty_termios_baud_rate(termios);
+        param_new = s->conf & MAX3100_BAUD;
+        switch (baud) {
+        case 300:
+                if (s->crystal)
+                        baud = s->baud;
+                else
+                        param_new = 15;
+                break;
+        case 600:
+                param_new = 14 + s->crystal;
+                break;
+        case 1200:
+                param_new = 13 + s->crystal;
+                break;
+        case 2400:
+                param_new = 12 + s->crystal;
+                break;
+        case 4800:
+                param_new = 11 + s->crystal;
+                break;
+        case 9600:
+                param_new = 10 + s->crystal;
+                break;
+        case 19200:
+                param_new = 9 + s->crystal;
+                break;
+        case 38400:
+                param_new = 8 + s->crystal;
+                break;
+        case 57600:
+                param_new = 1 + s->crystal;
+                break;
+        case 115200:
+                param_new = 0 + s->crystal;
+                break;
+        case 230400:
+                if (s->crystal)
+                        param_new = 0;
+                else
+                        baud = s->baud;
+                break;
+        default:
+                baud = s->baud;
+        }
+        tty_termios_encode_baud_rate(termios, baud, baud);
+        s->baud = baud;
+        param_mask |= MAX3100_BAUD;
+
+        if ((cflag & CSIZE) == CS8) {
+                param_new &= ~MAX3100_L;
+                parity &= ~MAX3100_7BIT;
+        } else {
+                param_new |= MAX3100_L;
+                parity |= MAX3100_7BIT;
+                cflag = (cflag & ~CSIZE) | CS7;
+        }
+        param_mask |= MAX3100_L;
+
+        if (cflag & CSTOPB)
+                param_new |= MAX3100_ST;
+        else
+                param_new &= ~MAX3100_ST;
+        param_mask |= MAX3100_ST;
+
+        if (cflag & PARENB) {
+                param_new |= MAX3100_PE;
+                parity |= MAX3100_PARITY_ON;
+        } else {
+                param_new &= ~MAX3100_PE;
+                parity &= ~MAX3100_PARITY_ON;
+        }
+        param_mask |= MAX3100_PE;
+
+        if (cflag & PARODD)
+                parity |= MAX3100_PARITY_ODD;
+        else
+                parity &= ~MAX3100_PARITY_ODD;
+
+        /* mask termios capabilities we don't support */
+        cflag &= ~CMSPAR;
+        termios->c_cflag = cflag;
+
+        s->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                s->port.ignore_status_mask |=
+                        MAX3100_STATUS_PE | MAX3100_STATUS_FE |
+                        MAX3100_STATUS_OE;
+
+        /* we are sending char from a workqueue so enable */
+        s->port.state->port.tty->low_latency = 1;
+
+        if (s->poll_time > 0)
+                del_timer_sync(&s->timer);
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        spin_lock(&s->conf_lock);
+        s->conf = (s->conf & ~param_mask) | (param_new & param_mask);
+        s->conf_commit = 1;
+        s->parity = parity;
+        spin_unlock(&s->conf_lock);
+        max3100_dowork(s);
+
+        if (UART_ENABLE_MS(&s->port, termios->c_cflag))
+                max3100_enable_ms(&s->port);
+}
+
+static void max3100_shutdown(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        if (s->suspending)
+                return;
+
+        s->force_end_work = 1;
+
+        if (s->poll_time > 0)
+                del_timer_sync(&s->timer);
+
+        if (s->workqueue) {
+                flush_workqueue(s->workqueue);
+                destroy_workqueue(s->workqueue);
+                s->workqueue = NULL;
+        }
+        if (s->irq)
+                free_irq(s->irq, s);
+
+        /* set shutdown mode to save power */
+        if (s->max3100_hw_suspend)
+                s->max3100_hw_suspend(1);
+        else  {
+                u16 tx, rx;
+
+                tx = MAX3100_WC | MAX3100_SHDN;
+                max3100_sr(s, tx, &rx);
+        }
+}
+
+static int max3100_startup(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+        char b[12];
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        s->conf = MAX3100_RM;
+        s->baud = s->crystal ? 230400 : 115200;
+        s->rx_enabled = 1;
+
+        if (s->suspending)
+                return 0;
+
+        s->force_end_work = 0;
+        s->parity = 0;
+        s->rts = 0;
+
+        sprintf(b, "max3100-%d", s->minor);
+        s->workqueue = create_freezable_workqueue(b);
+        if (!s->workqueue) {
+                dev_warn(&s->spi->dev, "cannot create workqueue\n");
+                return -EBUSY;
+        }
+        INIT_WORK(&s->work, max3100_work);
+
+        if (request_irq(s->irq, max3100_irq,
+                        IRQF_TRIGGER_FALLING, "max3100", s) < 0) {
+                dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq);
+                s->irq = 0;
+                destroy_workqueue(s->workqueue);
+                s->workqueue = NULL;
+                return -EBUSY;
+        }
+
+        if (s->loopback) {
+                u16 tx, rx;
+                tx = 0x4001;
+                max3100_sr(s, tx, &rx);
+        }
+
+        if (s->max3100_hw_suspend)
+                s->max3100_hw_suspend(0);
+        s->conf_commit = 1;
+        max3100_dowork(s);
+        /* wait for clock to settle */
+        msleep(50);
+
+        max3100_enable_ms(&s->port);
+
+        return 0;
+}
+
+static const char *max3100_type(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL;
+}
+
+static void max3100_release_port(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+}
+
+static void max3100_config_port(struct uart_port *port, int flags)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        if (flags & UART_CONFIG_TYPE)
+                s->port.type = PORT_MAX3100;
+}
+
+static int max3100_verify_port(struct uart_port *port,
+                               struct serial_struct *ser)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+        int ret = -EINVAL;
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100)
+                ret = 0;
+        return ret;
+}
+
+static void max3100_stop_tx(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+}
+
+static int max3100_request_port(struct uart_port *port)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+        return 0;
+}
+
+static void max3100_break_ctl(struct uart_port *port, int break_state)
+{
+        struct max3100_port *s = container_of(port,
+                                              struct max3100_port,
+                                              port);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+}
+
+static struct uart_ops max3100_ops = {
+        .tx_empty       = max3100_tx_empty,
+        .set_mctrl      = max3100_set_mctrl,
+        .get_mctrl      = max3100_get_mctrl,
+        .stop_tx        = max3100_stop_tx,
+        .start_tx       = max3100_start_tx,
+        .stop_rx        = max3100_stop_rx,
+        .enable_ms      = max3100_enable_ms,
+        .break_ctl      = max3100_break_ctl,
+        .startup        = max3100_startup,
+        .shutdown       = max3100_shutdown,
+        .set_termios    = max3100_set_termios,
+        .type           = max3100_type,
+        .release_port   = max3100_release_port,
+        .request_port   = max3100_request_port,
+        .config_port    = max3100_config_port,
+        .verify_port    = max3100_verify_port,
+};
+
+static struct uart_driver max3100_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "ttyMAX",
+        .dev_name       = "ttyMAX",
+        .major          = MAX3100_MAJOR,
+        .minor          = MAX3100_MINOR,
+        .nr             = MAX_MAX3100,
+};
+static int uart_driver_registered;
+
+static int __devinit max3100_probe(struct spi_device *spi)
+{
+        int i, retval;
+        struct plat_max3100 *pdata;
+        u16 tx, rx;
+
+        mutex_lock(&max3100s_lock);
+
+        if (!uart_driver_registered) {
+                uart_driver_registered = 1;
+                retval = uart_register_driver(&max3100_uart_driver);
+                if (retval) {
+                        printk(KERN_ERR "Couldn't register max3100 uart driver\n");
+                        mutex_unlock(&max3100s_lock);
+                        return retval;
+                }
+        }
+
+        for (i = 0; i < MAX_MAX3100; i++)
+                if (!max3100s[i])
+                        break;
+        if (i == MAX_MAX3100) {
+                dev_warn(&spi->dev, "too many MAX3100 chips\n");
+                mutex_unlock(&max3100s_lock);
+                return -ENOMEM;
+        }
+
+        max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL);
+        if (!max3100s[i]) {
+                dev_warn(&spi->dev,
+                         "kmalloc for max3100 structure %d failed!\n", i);
+                mutex_unlock(&max3100s_lock);
+                return -ENOMEM;
+        }
+        max3100s[i]->spi = spi;
+        max3100s[i]->irq = spi->irq;
+        spin_lock_init(&max3100s[i]->conf_lock);
+        dev_set_drvdata(&spi->dev, max3100s[i]);
+        pdata = spi->dev.platform_data;
+        max3100s[i]->crystal = pdata->crystal;
+        max3100s[i]->loopback = pdata->loopback;
+        max3100s[i]->poll_time = pdata->poll_time * HZ / 1000;
+        if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0)
+                max3100s[i]->poll_time = 1;
+        max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend;
+        max3100s[i]->minor = i;
+        init_timer(&max3100s[i]->timer);
+        max3100s[i]->timer.function = max3100_timeout;
+        max3100s[i]->timer.data = (unsigned long) max3100s[i];
+
+        dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i);
+        max3100s[i]->port.irq = max3100s[i]->irq;
+        max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200;
+        max3100s[i]->port.fifosize = 16;
+        max3100s[i]->port.ops = &max3100_ops;
+        max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
+        max3100s[i]->port.line = i;
+        max3100s[i]->port.type = PORT_MAX3100;
+        max3100s[i]->port.dev = &spi->dev;
+        retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port);
+        if (retval < 0)
+                dev_warn(&spi->dev,
+                         "uart_add_one_port failed for line %d with error %d\n",
+                         i, retval);
+
+        /* set shutdown mode to save power. Will be woken-up on open */
+        if (max3100s[i]->max3100_hw_suspend)
+                max3100s[i]->max3100_hw_suspend(1);
+        else {
+                tx = MAX3100_WC | MAX3100_SHDN;
+                max3100_sr(max3100s[i], tx, &rx);
+        }
+        mutex_unlock(&max3100s_lock);
+        return 0;
+}
+
+static int __devexit max3100_remove(struct spi_device *spi)
+{
+        struct max3100_port *s = dev_get_drvdata(&spi->dev);
+        int i;
+
+        mutex_lock(&max3100s_lock);
+
+        /* find out the index for the chip we are removing */
+        for (i = 0; i < MAX_MAX3100; i++)
+                if (max3100s[i] == s)
+                        break;
+
+        dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i);
+        uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port);
+        kfree(max3100s[i]);
+        max3100s[i] = NULL;
+
+        /* check if this is the last chip we have */
+        for (i = 0; i < MAX_MAX3100; i++)
+                if (max3100s[i]) {
+                        mutex_unlock(&max3100s_lock);
+                        return 0;
+                }
+        pr_debug("removing max3100 driver\n");
+        uart_unregister_driver(&max3100_uart_driver);
+
+        mutex_unlock(&max3100s_lock);
+        return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int max3100_suspend(struct spi_device *spi, pm_message_t state)
+{
+        struct max3100_port *s = dev_get_drvdata(&spi->dev);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        disable_irq(s->irq);
+
+        s->suspending = 1;
+        uart_suspend_port(&max3100_uart_driver, &s->port);
+
+        if (s->max3100_hw_suspend)
+                s->max3100_hw_suspend(1);
+        else {
+                /* no HW suspend, so do SW one */
+                u16 tx, rx;
+
+                tx = MAX3100_WC | MAX3100_SHDN;
+                max3100_sr(s, tx, &rx);
+        }
+        return 0;
+}
+
+static int max3100_resume(struct spi_device *spi)
+{
+        struct max3100_port *s = dev_get_drvdata(&spi->dev);
+
+        dev_dbg(&s->spi->dev, "%s\n", __func__);
+
+        if (s->max3100_hw_suspend)
+                s->max3100_hw_suspend(0);
+        uart_resume_port(&max3100_uart_driver, &s->port);
+        s->suspending = 0;
+
+        enable_irq(s->irq);
+
+        s->conf_commit = 1;
+        if (s->workqueue)
+                max3100_dowork(s);
+
+        return 0;
+}
+
+#else
+#define max3100_suspend NULL
+#define max3100_resume  NULL
+#endif
+
+static struct spi_driver max3100_driver = {
+        .driver = {
+                .name           = "max3100",
+                .bus            = &spi_bus_type,
+                .owner          = THIS_MODULE,
+        },
+
+        .probe          = max3100_probe,
+        .remove         = __devexit_p(max3100_remove),
+        .suspend        = max3100_suspend,
+        .resume         = max3100_resume,
+};
+
+static int __init max3100_init(void)
+{
+        return spi_register_driver(&max3100_driver);
+}
+module_init(max3100_init);
+
+static void __exit max3100_exit(void)
+{
+        spi_unregister_driver(&max3100_driver);
+}
+module_exit(max3100_exit);
+
+MODULE_DESCRIPTION("MAX3100 driver");
+MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:max3100");
diff --git a/drivers/tty/serial/max3107-aava.c b/drivers/tty/serial/max3107-aava.c
new file mode 100644
index 000000000000..a1fe304f2f52
--- /dev/null
+++ b/drivers/tty/serial/max3107-aava.c
@@ -0,0 +1,344 @@
+/*
+ *  max3107.c - spi uart protocol driver for Maxim 3107
+ *  Based on max3100.c
+ *      by Christian Pellegrin <chripell@evolware.org>
+ *  and max3110.c
+ *      by Feng Tang <feng.tang@intel.com>
+ *
+ *  Copyright (C) Aavamobile 2009
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/spi/spi.h>
+#include <linux/freezer.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/sfi.h>
+#include <asm/mrst.h>
+#include "max3107.h"
+
+/* GPIO direction to input function */
+static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+        struct max3107_port *s = container_of(chip, struct max3107_port, chip);
+        u16 buf[1];             /* Buffer for SPI transfer */
+
+        if (offset >= MAX3107_GPIO_COUNT) {
+                dev_err(&s->spi->dev, "Invalid GPIO\n");
+                return -EINVAL;
+        }
+
+        /* Read current GPIO configuration register */
+        buf[0] = MAX3107_GPIOCFG_REG;
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
+                dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n");
+                return -EIO;
+        }
+        buf[0] &= MAX3107_SPI_RX_DATA_MASK;
+
+        /* Set GPIO to input */
+        buf[0] &= ~(0x0001 << offset);
+
+        /* Write new GPIO configuration register value */
+        buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, NULL, 2)) {
+                dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n");
+                return -EIO;
+        }
+        return 0;
+}
+
+/* GPIO direction to output function */
+static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset,
+                                        int value)
+{
+        struct max3107_port *s = container_of(chip, struct max3107_port, chip);
+        u16 buf[2];     /* Buffer for SPI transfers */
+
+        if (offset >= MAX3107_GPIO_COUNT) {
+                dev_err(&s->spi->dev, "Invalid GPIO\n");
+                return -EINVAL;
+        }
+
+        /* Read current GPIO configuration and data registers */
+        buf[0] = MAX3107_GPIOCFG_REG;
+        buf[1] = MAX3107_GPIODATA_REG;
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
+                dev_err(&s->spi->dev, "SPI transfer gpio failed\n");
+                return -EIO;
+        }
+        buf[0] &= MAX3107_SPI_RX_DATA_MASK;
+        buf[1] &= MAX3107_SPI_RX_DATA_MASK;
+
+        /* Set GPIO to output */
+        buf[0] |= (0x0001 << offset);
+        /* Set value */
+        if (value)
+                buf[1] |= (0x0001 << offset);
+        else
+                buf[1] &= ~(0x0001 << offset);
+
+        /* Write new GPIO configuration and data register values */
+        buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG);
+        buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
+                dev_err(&s->spi->dev,
+                        "SPI transfer for GPIO conf data w failed\n");
+                return -EIO;
+        }
+        return 0;
+}
+
+/* GPIO value query function */
+static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+        struct max3107_port *s = container_of(chip, struct max3107_port, chip);
+        u16 buf[1];     /* Buffer for SPI transfer */
+
+        if (offset >= MAX3107_GPIO_COUNT) {
+                dev_err(&s->spi->dev, "Invalid GPIO\n");
+                return -EINVAL;
+        }
+
+        /* Read current GPIO data register */
+        buf[0] = MAX3107_GPIODATA_REG;
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
+                dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n");
+                return -EIO;
+        }
+        buf[0] &= MAX3107_SPI_RX_DATA_MASK;
+
+        /* Return value */
+        return buf[0] & (0x0001 << offset);
+}
+
+/* GPIO value set function */
+static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+        struct max3107_port *s = container_of(chip, struct max3107_port, chip);
+        u16 buf[2];     /* Buffer for SPI transfers */
+
+        if (offset >= MAX3107_GPIO_COUNT) {
+                dev_err(&s->spi->dev, "Invalid GPIO\n");
+                return;
+        }
+
+        /* Read current GPIO configuration registers*/
+        buf[0] = MAX3107_GPIODATA_REG;
+        buf[1] = MAX3107_GPIOCFG_REG;
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) {
+                dev_err(&s->spi->dev,
+                        "SPI transfer for GPIO data and config read failed\n");
+                return;
+        }
+        buf[0] &= MAX3107_SPI_RX_DATA_MASK;
+        buf[1] &= MAX3107_SPI_RX_DATA_MASK;
+
+        if (!(buf[1] & (0x0001 << offset))) {
+                /* Configured as input, can't set value */
+                dev_warn(&s->spi->dev,
+                                "Trying to set value for input GPIO\n");
+                return;
+        }
+
+        /* Set value */
+        if (value)
+                buf[0] |= (0x0001 << offset);
+        else
+                buf[0] &= ~(0x0001 << offset);
+
+        /* Write new GPIO data register value */
+        buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG);
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, NULL, 2))
+                dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n");
+}
+
+/* GPIO chip data */
+static struct gpio_chip max3107_gpio_chip = {
+        .owner                  = THIS_MODULE,
+        .direction_input        = max3107_gpio_direction_in,
+        .direction_output       = max3107_gpio_direction_out,
+        .get                    = max3107_gpio_get,
+        .set                    = max3107_gpio_set,
+        .can_sleep              = 1,
+        .base                   = MAX3107_GPIO_BASE,
+        .ngpio                  = MAX3107_GPIO_COUNT,
+};
+
+/**
+ *      max3107_aava_reset      -       reset on AAVA systems
+ *      @spi: The SPI device we are probing
+ *
+ *      Reset the device ready for probing.
+ */
+
+static int max3107_aava_reset(struct spi_device *spi)
+{
+        /* Reset the chip */
+        if (gpio_request(MAX3107_RESET_GPIO, "max3107")) {
+                pr_err("Requesting RESET GPIO failed\n");
+                return -EIO;
+        }
+        if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) {
+                pr_err("Setting RESET GPIO to 0 failed\n");
+                gpio_free(MAX3107_RESET_GPIO);
+                return -EIO;
+        }
+        msleep(MAX3107_RESET_DELAY);
+        if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) {
+                pr_err("Setting RESET GPIO to 1 failed\n");
+                gpio_free(MAX3107_RESET_GPIO);
+                return -EIO;
+        }
+        gpio_free(MAX3107_RESET_GPIO);
+        msleep(MAX3107_WAKEUP_DELAY);
+        return 0;
+}
+
+static int max3107_aava_configure(struct max3107_port *s)
+{
+        int retval;
+
+        /* Initialize GPIO chip data */
+        s->chip = max3107_gpio_chip;
+        s->chip.label = s->spi->modalias;
+        s->chip.dev = &s->spi->dev;
+
+        /* Add GPIO chip */
+        retval = gpiochip_add(&s->chip);
+        if (retval) {
+                dev_err(&s->spi->dev, "Adding GPIO chip failed\n");
+                return retval;
+        }
+
+        /* Temporary fix for EV2 boot problems, set modem reset to 0 */
+        max3107_gpio_direction_out(&s->chip, 3, 0);
+        return 0;
+}
+
+#if 0
+/* This will get enabled once we have the board stuff merged for this
+   specific case */
+
+static const struct baud_table brg13_ext[] = {
+        { 300,    MAX3107_BRG13_B300 },
+        { 600,    MAX3107_BRG13_B600 },
+        { 1200,   MAX3107_BRG13_B1200 },
+        { 2400,   MAX3107_BRG13_B2400 },
+        { 4800,   MAX3107_BRG13_B4800 },
+        { 9600,   MAX3107_BRG13_B9600 },
+        { 19200,  MAX3107_BRG13_B19200 },
+        { 57600,  MAX3107_BRG13_B57600 },
+        { 115200, MAX3107_BRG13_B115200 },
+        { 230400, MAX3107_BRG13_B230400 },
+        { 460800, MAX3107_BRG13_B460800 },
+        { 921600, MAX3107_BRG13_B921600 },
+        { 0, 0 }
+};
+
+static void max3107_aava_init(struct max3107_port *s)
+{
+        /*override for AAVA SC specific*/
+        if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) {
+                if (get_koski_build_id() <= KOSKI_EV2)
+                        if (s->ext_clk) {
+                                s->brg_cfg = MAX3107_BRG13_B9600;
+                                s->baud_tbl = (struct baud_table *)brg13_ext;
+                        }
+        }
+}
+#endif
+
+static int __devexit max3107_aava_remove(struct spi_device *spi)
+{
+        struct max3107_port *s = dev_get_drvdata(&spi->dev);
+
+        /* Remove GPIO chip */
+        if (gpiochip_remove(&s->chip))
+                dev_warn(&spi->dev, "Removing GPIO chip failed\n");
+
+        /* Then do the default remove */
+        return max3107_remove(spi);
+}
+
+/* Platform data */
+static struct max3107_plat aava_plat_data = {
+        .loopback               = 0,
+        .ext_clk                = 1,
+/*      .init                   = max3107_aava_init, */
+        .configure              = max3107_aava_configure,
+        .hw_suspend             = max3107_hw_susp,
+        .polled_mode            = 0,
+        .poll_time              = 0,
+};
+
+
+static int __devinit max3107_probe_aava(struct spi_device *spi)
+{
+        int err = max3107_aava_reset(spi);
+        if (err < 0)
+                return err;
+        return max3107_probe(spi, &aava_plat_data);
+}
+
+/* Spi driver data */
+static struct spi_driver max3107_driver = {
+        .driver = {
+                .name           = "aava-max3107",
+                .bus            = &spi_bus_type,
+                .owner          = THIS_MODULE,
+        },
+        .probe          = max3107_probe_aava,
+        .remove         = __devexit_p(max3107_aava_remove),
+        .suspend        = max3107_suspend,
+        .resume         = max3107_resume,
+};
+
+/* Driver init function */
+static int __init max3107_init(void)
+{
+        return spi_register_driver(&max3107_driver);
+}
+
+/* Driver exit function */
+static void __exit max3107_exit(void)
+{
+        spi_unregister_driver(&max3107_driver);
+}
+
+module_init(max3107_init);
+module_exit(max3107_exit);
+
+MODULE_DESCRIPTION("MAX3107 driver");
+MODULE_AUTHOR("Aavamobile");
+MODULE_ALIAS("aava-max3107-spi");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/max3107.c b/drivers/tty/serial/max3107.c
new file mode 100644
index 000000000000..750b4f627315
--- /dev/null
+++ b/drivers/tty/serial/max3107.c
@@ -0,0 +1,1213 @@
+/*
+ *  max3107.c - spi uart protocol driver for Maxim 3107
+ *  Based on max3100.c
+ *      by Christian Pellegrin <chripell@evolware.org>
+ *  and max3110.c
+ *      by Feng Tang <feng.tang@intel.com>
+ *
+ *  Copyright (C) Aavamobile 2009
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/freezer.h>
+#include "max3107.h"
+
+static const struct baud_table brg26_ext[] = {
+        { 300,    MAX3107_BRG26_B300 },
+        { 600,    MAX3107_BRG26_B600 },
+        { 1200,   MAX3107_BRG26_B1200 },
+        { 2400,   MAX3107_BRG26_B2400 },
+        { 4800,   MAX3107_BRG26_B4800 },
+        { 9600,   MAX3107_BRG26_B9600 },
+        { 19200,  MAX3107_BRG26_B19200 },
+        { 57600,  MAX3107_BRG26_B57600 },
+        { 115200, MAX3107_BRG26_B115200 },
+        { 230400, MAX3107_BRG26_B230400 },
+        { 460800, MAX3107_BRG26_B460800 },
+        { 921600, MAX3107_BRG26_B921600 },
+        { 0, 0 }
+};
+
+static const struct baud_table brg13_int[] = {
+        { 300,    MAX3107_BRG13_IB300 },
+        { 600,    MAX3107_BRG13_IB600 },
+        { 1200,   MAX3107_BRG13_IB1200 },
+        { 2400,   MAX3107_BRG13_IB2400 },
+        { 4800,   MAX3107_BRG13_IB4800 },
+        { 9600,   MAX3107_BRG13_IB9600 },
+        { 19200,  MAX3107_BRG13_IB19200 },
+        { 57600,  MAX3107_BRG13_IB57600 },
+        { 115200, MAX3107_BRG13_IB115200 },
+        { 230400, MAX3107_BRG13_IB230400 },
+        { 460800, MAX3107_BRG13_IB460800 },
+        { 921600, MAX3107_BRG13_IB921600 },
+        { 0, 0 }
+};
+
+static u32 get_new_brg(int baud, struct max3107_port *s)
+{
+        int i;
+        const struct baud_table *baud_tbl = s->baud_tbl;
+
+        for (i = 0; i < 13; i++) {
+                if (baud == baud_tbl[i].baud)
+                        return baud_tbl[i].new_brg;
+        }
+
+        return 0;
+}
+
+/* Perform SPI transfer for write/read of device register(s) */
+int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len)
+{
+        struct spi_message spi_msg;
+        struct spi_transfer spi_xfer;
+
+        /* Initialize SPI ,message */
+        spi_message_init(&spi_msg);
+
+        /* Initialize SPI transfer */
+        memset(&spi_xfer, 0, sizeof spi_xfer);
+        spi_xfer.len = len;
+        spi_xfer.tx_buf = tx;
+        spi_xfer.rx_buf = rx;
+        spi_xfer.speed_hz = MAX3107_SPI_SPEED;
+
+        /* Add SPI transfer to SPI message */
+        spi_message_add_tail(&spi_xfer, &spi_msg);
+
+#ifdef DBG_TRACE_SPI_DATA
+        {
+                int i;
+                pr_info("tx len %d:\n", spi_xfer.len);
+                for (i = 0 ; i < spi_xfer.len && i < 32 ; i++)
+                        pr_info(" %x", ((u8 *)spi_xfer.tx_buf)[i]);
+                pr_info("\n");
+        }
+#endif
+
+        /* Perform synchronous SPI transfer */
+        if (spi_sync(s->spi, &spi_msg)) {
+                dev_err(&s->spi->dev, "spi_sync failure\n");
+                return -EIO;
+        }
+
+#ifdef DBG_TRACE_SPI_DATA
+        if (spi_xfer.rx_buf) {
+                int i;
+                pr_info("rx len %d:\n", spi_xfer.len);
+                for (i = 0 ; i < spi_xfer.len && i < 32 ; i++)
+                        pr_info(" %x", ((u8 *)spi_xfer.rx_buf)[i]);
+                pr_info("\n");
+        }
+#endif
+        return 0;
+}
+EXPORT_SYMBOL_GPL(max3107_rw);
+
+/* Puts received data to circular buffer */
+static void put_data_to_circ_buf(struct max3107_port *s, unsigned char *data,
+                                        int len)
+{
+        struct uart_port *port = &s->port;
+        struct tty_struct *tty;
+
+        if (!port->state)
+                return;
+
+        tty = port->state->port.tty;
+        if (!tty)
+                return;
+
+        /* Insert received data */
+        tty_insert_flip_string(tty, data, len);
+        /* Update RX counter */
+        port->icount.rx += len;
+}
+
+/* Handle data receiving */
+static void max3107_handlerx(struct max3107_port *s, u16 rxlvl)
+{
+        int i;
+        int j;
+        int len;                                /* SPI transfer buffer length */
+        u16 *buf;
+        u8 *valid_str;
+
+        if (!s->rx_enabled)
+                /* RX is disabled */
+                return;
+
+        if (rxlvl == 0) {
+                /* RX fifo is empty */
+                return;
+        } else if (rxlvl >= MAX3107_RX_FIFO_SIZE) {
+                dev_warn(&s->spi->dev, "Possible RX FIFO overrun %d\n", rxlvl);
+                /* Ensure sanity of RX level */
+                rxlvl = MAX3107_RX_FIFO_SIZE;
+        }
+        if ((s->rxbuf == 0) || (s->rxstr == 0)) {
+                dev_warn(&s->spi->dev, "Rx buffer/str isn't ready\n");
+                return;
+        }
+        buf = s->rxbuf;
+        valid_str = s->rxstr;
+        while (rxlvl) {
+                pr_debug("rxlvl %d\n", rxlvl);
+                /* Clear buffer */
+                memset(buf, 0, sizeof(u16) * (MAX3107_RX_FIFO_SIZE + 2));
+                len = 0;
+                if (s->irqen_reg & MAX3107_IRQ_RXFIFO_BIT) {
+                        /* First disable RX FIFO interrupt */
+                        pr_debug("Disabling RX INT\n");
+                        buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
+                        s->irqen_reg &= ~MAX3107_IRQ_RXFIFO_BIT;
+                        buf[0] |= s->irqen_reg;
+                        len++;
+                }
+                /* Just increase the length by amount of words in FIFO since
+                 * buffer was zeroed and SPI transfer of 0x0000 means reading
+                 * from RX FIFO
+                 */
+                len += rxlvl;
+                /* Append RX level query */
+                buf[len] = MAX3107_RXFIFOLVL_REG;
+                len++;
+
+                /* Perform the SPI transfer */
+                if (max3107_rw(s, (u8 *)buf, (u8 *)buf, len * 2)) {
+                        dev_err(&s->spi->dev, "SPI transfer for RX h failed\n");
+                        return;
+                }
+
+                /* Skip RX FIFO interrupt disabling word if it was added */
+                j = ((len - 1) - rxlvl);
+                /* Read received words */
+                for (i = 0; i < rxlvl; i++, j++)
+                        valid_str[i] = (u8)buf[j];
+                put_data_to_circ_buf(s, valid_str, rxlvl);
+                /* Get new RX level */
+                rxlvl = (buf[len - 1] & MAX3107_SPI_RX_DATA_MASK);
+        }
+
+        if (s->rx_enabled) {
+                /* RX still enabled, re-enable RX FIFO interrupt */
+                pr_debug("Enabling RX INT\n");
+                buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
+                s->irqen_reg |= MAX3107_IRQ_RXFIFO_BIT;
+                buf[0] |= s->irqen_reg;
+                if (max3107_rw(s, (u8 *)buf, NULL, 2))
+                        dev_err(&s->spi->dev, "RX FIFO INT enabling failed\n");
+        }
+
+        /* Push the received data to receivers */
+        if (s->port.state->port.tty)
+                tty_flip_buffer_push(s->port.state->port.tty);
+}
+
+
+/* Handle data sending */
+static void max3107_handletx(struct max3107_port *s)
+{
+        struct circ_buf *xmit = &s->port.state->xmit;
+        int i;
+        unsigned long flags;
+        int len;                                /* SPI transfer buffer length */
+        u16 *buf;
+
+        if (!s->tx_fifo_empty)
+                /* Don't send more data before previous data is sent */
+                return;
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&s->port))
+                /* No data to send or TX is stopped */
+                return;
+
+        if (!s->txbuf) {
+                dev_warn(&s->spi->dev, "Txbuf isn't ready\n");
+                return;
+        }
+        buf = s->txbuf;
+        /* Get length of data pending in circular buffer */
+        len = uart_circ_chars_pending(xmit);
+        if (len) {
+                /* Limit to size of TX FIFO */
+                if (len > MAX3107_TX_FIFO_SIZE)
+                        len = MAX3107_TX_FIFO_SIZE;
+
+                pr_debug("txlen %d\n", len);
+
+                /* Update TX counter */
+                s->port.icount.tx += len;
+
+                /* TX FIFO will no longer be empty */
+                s->tx_fifo_empty = 0;
+
+                i = 0;
+                if (s->irqen_reg & MAX3107_IRQ_TXEMPTY_BIT) {
+                        /* First disable TX empty interrupt */
+                        pr_debug("Disabling TE INT\n");
+                        buf[i] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
+                        s->irqen_reg &= ~MAX3107_IRQ_TXEMPTY_BIT;
+                        buf[i] |= s->irqen_reg;
+                        i++;
+                        len++;
+                }
+                /* Add data to send */
+                spin_lock_irqsave(&s->port.lock, flags);
+                for ( ; i < len ; i++) {
+                        buf[i] = (MAX3107_WRITE_BIT | MAX3107_THR_REG);
+                        buf[i] |= ((u16)xmit->buf[xmit->tail] &
+                                                MAX3107_SPI_TX_DATA_MASK);
+                        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                }
+                spin_unlock_irqrestore(&s->port.lock, flags);
+                if (!(s->irqen_reg & MAX3107_IRQ_TXEMPTY_BIT)) {
+                        /* Enable TX empty interrupt */
+                        pr_debug("Enabling TE INT\n");
+                        buf[i] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG);
+                        s->irqen_reg |= MAX3107_IRQ_TXEMPTY_BIT;
+                        buf[i] |= s->irqen_reg;
+                        i++;
+                        len++;
+                }
+                if (!s->tx_enabled) {
+                        /* Enable TX */
+                        pr_debug("Enable TX\n");
+                        buf[i] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
+                        spin_lock_irqsave(&s->data_lock, flags);
+                        s->mode1_reg &= ~MAX3107_MODE1_TXDIS_BIT;
+                        buf[i] |= s->mode1_reg;
+                        spin_unlock_irqrestore(&s->data_lock, flags);
+                        s->tx_enabled = 1;
+                        i++;
+                        len++;
+                }
+
+                /* Perform the SPI transfer */
+                if (max3107_rw(s, (u8 *)buf, NULL, len*2)) {
+                        dev_err(&s->spi->dev,
+                                "SPI transfer TX handling failed\n");
+                        return;
+                }
+        }
+
+        /* Indicate wake up if circular buffer is getting low on data */
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&s->port);
+
+}
+
+/* Handle interrupts
+ * Also reads and returns current RX FIFO level
+ */
+static u16 handle_interrupt(struct max3107_port *s)
+{
+        u16 buf[4];     /* Buffer for SPI transfers */
+        u8 irq_status;
+        u16 rx_level;
+        unsigned long flags;
+
+        /* Read IRQ status register */
+        buf[0] = MAX3107_IRQSTS_REG;
+        /* Read status IRQ status register */
+        buf[1] = MAX3107_STS_IRQSTS_REG;
+        /* Read LSR IRQ status register */
+        buf[2] = MAX3107_LSR_IRQSTS_REG;
+        /* Query RX level */
+        buf[3] = MAX3107_RXFIFOLVL_REG;
+
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 8)) {
+                dev_err(&s->spi->dev,
+                        "SPI transfer for INTR handling failed\n");
+                return 0;
+        }
+
+        irq_status = (u8)buf[0];
+        pr_debug("IRQSTS %x\n", irq_status);
+        rx_level = (buf[3] & MAX3107_SPI_RX_DATA_MASK);
+
+        if (irq_status & MAX3107_IRQ_LSR_BIT) {
+                /* LSR interrupt */
+                if (buf[2] & MAX3107_LSR_RXTO_BIT)
+                        /* RX timeout interrupt,
+                         * handled by normal RX handling
+                         */
+                        pr_debug("RX TO INT\n");
+        }
+
+        if (irq_status & MAX3107_IRQ_TXEMPTY_BIT) {
+                /* Tx empty interrupt,
+                 * disable TX and set tx_fifo_empty flag
+                 */
+                pr_debug("TE INT, disabling TX\n");
+                buf[0] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
+                spin_lock_irqsave(&s->data_lock, flags);
+                s->mode1_reg |= MAX3107_MODE1_TXDIS_BIT;
+                buf[0] |= s->mode1_reg;
+                spin_unlock_irqrestore(&s->data_lock, flags);
+                if (max3107_rw(s, (u8 *)buf, NULL, 2))
+                        dev_err(&s->spi->dev, "SPI transfer TX dis failed\n");
+                s->tx_enabled = 0;
+                s->tx_fifo_empty = 1;
+        }
+
+        if (irq_status & MAX3107_IRQ_RXFIFO_BIT)
+                /* RX FIFO interrupt,
+                 * handled by normal RX handling
+                 */
+                pr_debug("RFIFO INT\n");
+
+        /* Return RX level */
+        return rx_level;
+}
+
+/* Trigger work thread*/
+static void max3107_dowork(struct max3107_port *s)
+{
+        if (!work_pending(&s->work) && !freezing(current) && !s->suspended)
+                queue_work(s->workqueue, &s->work);
+        else
+                dev_warn(&s->spi->dev, "interrup isn't serviced normally!\n");
+}
+
+/* Work thread */
+static void max3107_work(struct work_struct *w)
+{
+        struct max3107_port *s = container_of(w, struct max3107_port, work);
+        u16 rxlvl = 0;
+        int len;        /* SPI transfer buffer length */
+        u16 buf[5];     /* Buffer for SPI transfers */
+        unsigned long flags;
+
+        /* Start by reading current RX FIFO level */
+        buf[0] = MAX3107_RXFIFOLVL_REG;
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
+                dev_err(&s->spi->dev, "SPI transfer RX lev failed\n");
+                rxlvl = 0;
+        } else {
+                rxlvl = (buf[0] & MAX3107_SPI_RX_DATA_MASK);
+        }
+
+        do {
+                pr_debug("rxlvl %d\n", rxlvl);
+
+                /* Handle RX */
+                max3107_handlerx(s, rxlvl);
+                rxlvl = 0;
+
+                if (s->handle_irq) {
+                        /* Handle pending interrupts
+                         * We also get new RX FIFO level since new data may
+                         * have been received while pushing received data to
+                         * receivers
+                         */
+                        s->handle_irq = 0;
+                        rxlvl = handle_interrupt(s);
+                }
+
+                /* Handle TX */
+                max3107_handletx(s);
+
+                /* Handle configuration changes */
+                len = 0;
+                spin_lock_irqsave(&s->data_lock, flags);
+                if (s->mode1_commit) {
+                        pr_debug("mode1_commit\n");
+                        buf[len] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
+                        buf[len++] |= s->mode1_reg;
+                        s->mode1_commit = 0;
+                }
+                if (s->lcr_commit) {
+                        pr_debug("lcr_commit\n");
+                        buf[len] = (MAX3107_WRITE_BIT | MAX3107_LCR_REG);
+                        buf[len++] |= s->lcr_reg;
+                        s->lcr_commit = 0;
+                }
+                if (s->brg_commit) {
+                        pr_debug("brg_commit\n");
+                        buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVMSB_REG);
+                        buf[len++] |= ((s->brg_cfg >> 16) &
+                                                MAX3107_SPI_TX_DATA_MASK);
+                        buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVLSB_REG);
+                        buf[len++] |= ((s->brg_cfg >> 8) &
+                                                MAX3107_SPI_TX_DATA_MASK);
+                        buf[len] = (MAX3107_WRITE_BIT | MAX3107_BRGCFG_REG);
+                        buf[len++] |= ((s->brg_cfg) & 0xff);
+                        s->brg_commit = 0;
+                }
+                spin_unlock_irqrestore(&s->data_lock, flags);
+
+                if (len > 0) {
+                        if (max3107_rw(s, (u8 *)buf, NULL, len * 2))
+                                dev_err(&s->spi->dev,
+                                        "SPI transfer config failed\n");
+                }
+
+                /* Reloop if interrupt handling indicated data in RX FIFO */
+        } while (rxlvl);
+
+}
+
+/* Set sleep mode */
+static void max3107_set_sleep(struct max3107_port *s, int mode)
+{
+        u16 buf[1];     /* Buffer for SPI transfer */
+        unsigned long flags;
+        pr_debug("enter, mode %d\n", mode);
+
+        buf[0] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG);
+        spin_lock_irqsave(&s->data_lock, flags);
+        switch (mode) {
+        case MAX3107_DISABLE_FORCED_SLEEP:
+                        s->mode1_reg &= ~MAX3107_MODE1_FORCESLEEP_BIT;
+                        break;
+        case MAX3107_ENABLE_FORCED_SLEEP:
+                        s->mode1_reg |= MAX3107_MODE1_FORCESLEEP_BIT;
+                        break;
+        case MAX3107_DISABLE_AUTOSLEEP:
+                        s->mode1_reg &= ~MAX3107_MODE1_AUTOSLEEP_BIT;
+                        break;
+        case MAX3107_ENABLE_AUTOSLEEP:
+                        s->mode1_reg |= MAX3107_MODE1_AUTOSLEEP_BIT;
+                        break;
+        default:
+                spin_unlock_irqrestore(&s->data_lock, flags);
+                dev_warn(&s->spi->dev, "invalid sleep mode\n");
+                return;
+        }
+        buf[0] |= s->mode1_reg;
+        spin_unlock_irqrestore(&s->data_lock, flags);
+
+        if (max3107_rw(s, (u8 *)buf, NULL, 2))
+                dev_err(&s->spi->dev, "SPI transfer sleep mode failed\n");
+
+        if (mode == MAX3107_DISABLE_AUTOSLEEP ||
+                        mode == MAX3107_DISABLE_FORCED_SLEEP)
+                msleep(MAX3107_WAKEUP_DELAY);
+}
+
+/* Perform full register initialization */
+static void max3107_register_init(struct max3107_port *s)
+{
+        u16 buf[11];    /* Buffer for SPI transfers */
+
+        /* 1. Configure baud rate, 9600 as default */
+        s->baud = 9600;
+        /* the below is default*/
+        if (s->ext_clk) {
+                s->brg_cfg = MAX3107_BRG26_B9600;
+                s->baud_tbl = (struct baud_table *)brg26_ext;
+        } else {
+                s->brg_cfg = MAX3107_BRG13_IB9600;
+                s->baud_tbl = (struct baud_table *)brg13_int;
+        }
+
+        if (s->pdata->init)
+                s->pdata->init(s);
+
+        buf[0] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVMSB_REG)
+                | ((s->brg_cfg >> 16) & MAX3107_SPI_TX_DATA_MASK);
+        buf[1] = (MAX3107_WRITE_BIT | MAX3107_BRGDIVLSB_REG)
+                | ((s->brg_cfg >> 8) & MAX3107_SPI_TX_DATA_MASK);
+        buf[2] = (MAX3107_WRITE_BIT | MAX3107_BRGCFG_REG)
+                | ((s->brg_cfg) & 0xff);
+
+        /* 2. Configure LCR register, 8N1 mode by default */
+        s->lcr_reg = MAX3107_LCR_WORD_LEN_8;
+        buf[3] = (MAX3107_WRITE_BIT | MAX3107_LCR_REG)
+                | s->lcr_reg;
+
+        /* 3. Configure MODE 1 register */
+        s->mode1_reg = 0;
+        /* Enable IRQ pin */
+        s->mode1_reg |= MAX3107_MODE1_IRQSEL_BIT;
+        /* Disable TX */
+        s->mode1_reg |= MAX3107_MODE1_TXDIS_BIT;
+        s->tx_enabled = 0;
+        /* RX is enabled */
+        s->rx_enabled = 1;
+        buf[4] = (MAX3107_WRITE_BIT | MAX3107_MODE1_REG)
+                | s->mode1_reg;
+
+        /* 4. Configure MODE 2 register */
+        buf[5] = (MAX3107_WRITE_BIT | MAX3107_MODE2_REG);
+        if (s->loopback) {
+                /* Enable loopback */
+                buf[5] |= MAX3107_MODE2_LOOPBACK_BIT;
+        }
+        /* Reset FIFOs */
+        buf[5] |= MAX3107_MODE2_FIFORST_BIT;
+        s->tx_fifo_empty = 1;
+
+        /* 5. Configure FIFO trigger level register */
+        buf[6] = (MAX3107_WRITE_BIT | MAX3107_FIFOTRIGLVL_REG);
+        /* RX FIFO trigger for 16 words, TX FIFO trigger not used */
+        buf[6] |= (MAX3107_FIFOTRIGLVL_RX(16) | MAX3107_FIFOTRIGLVL_TX(0));
+
+        /* 6. Configure flow control levels */
+        buf[7] = (MAX3107_WRITE_BIT | MAX3107_FLOWLVL_REG);
+        /* Flow control halt level 96, resume level 48 */
+        buf[7] |= (MAX3107_FLOWLVL_RES(48) | MAX3107_FLOWLVL_HALT(96));
+
+        /* 7. Configure flow control */
+        buf[8] = (MAX3107_WRITE_BIT | MAX3107_FLOWCTRL_REG);
+        /* Enable auto CTS and auto RTS flow control */
+        buf[8] |= (MAX3107_FLOWCTRL_AUTOCTS_BIT | MAX3107_FLOWCTRL_AUTORTS_BIT);
+
+        /* 8. Configure RX timeout register */
+        buf[9] = (MAX3107_WRITE_BIT | MAX3107_RXTO_REG);
+        /* Timeout after 48 character intervals */
+        buf[9] |= 0x0030;
+
+        /* 9. Configure LSR interrupt enable register */
+        buf[10] = (MAX3107_WRITE_BIT | MAX3107_LSR_IRQEN_REG);
+        /* Enable RX timeout interrupt */
+        buf[10] |= MAX3107_LSR_RXTO_BIT;
+
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, NULL, 22))
+                dev_err(&s->spi->dev, "SPI transfer for init failed\n");
+
+        /* 10. Clear IRQ status register by reading it */
+        buf[0] = MAX3107_IRQSTS_REG;
+
+        /* 11. Configure interrupt enable register */
+        /* Enable LSR interrupt */
+        s->irqen_reg = MAX3107_IRQ_LSR_BIT;
+        /* Enable RX FIFO interrupt */
+        s->irqen_reg |= MAX3107_IRQ_RXFIFO_BIT;
+        buf[1] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG)
+                | s->irqen_reg;
+
+        /* 12. Clear FIFO reset that was set in step 6 */
+        buf[2] = (MAX3107_WRITE_BIT | MAX3107_MODE2_REG);
+        if (s->loopback) {
+                /* Keep loopback enabled */
+                buf[2] |= MAX3107_MODE2_LOOPBACK_BIT;
+        }
+
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 6))
+                dev_err(&s->spi->dev, "SPI transfer for init failed\n");
+
+}
+
+/* IRQ handler */
+static irqreturn_t max3107_irq(int irqno, void *dev_id)
+{
+        struct max3107_port *s = dev_id;
+
+        if (irqno != s->spi->irq) {
+                /* Unexpected IRQ */
+                return IRQ_NONE;
+        }
+
+        /* Indicate irq */
+        s->handle_irq = 1;
+
+        /* Trigger work thread */
+        max3107_dowork(s);
+
+        return IRQ_HANDLED;
+}
+
+/* HW suspension function
+ *
+ * Currently autosleep is used to decrease current consumption, alternative
+ * approach would be to set the chip to reset mode if UART is not being
+ * used but that would mess the GPIOs
+ *
+ */
+void max3107_hw_susp(struct max3107_port *s, int suspend)
+{
+        pr_debug("enter, suspend %d\n", suspend);
+
+        if (suspend) {
+                /* Suspend requested,
+                 * enable autosleep to decrease current consumption
+                 */
+                s->suspended = 1;
+                max3107_set_sleep(s, MAX3107_ENABLE_AUTOSLEEP);
+        } else {
+                /* Resume requested,
+                 * disable autosleep
+                 */
+                s->suspended = 0;
+                max3107_set_sleep(s, MAX3107_DISABLE_AUTOSLEEP);
+        }
+}
+EXPORT_SYMBOL_GPL(max3107_hw_susp);
+
+/* Modem status IRQ enabling */
+static void max3107_enable_ms(struct uart_port *port)
+{
+        /* Modem status not supported */
+}
+
+/* Data send function */
+static void max3107_start_tx(struct uart_port *port)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+
+        /* Trigger work thread for sending data */
+        max3107_dowork(s);
+}
+
+/* Function for checking that there is no pending transfers */
+static unsigned int max3107_tx_empty(struct uart_port *port)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+
+        pr_debug("returning %d\n",
+                  (s->tx_fifo_empty && uart_circ_empty(&s->port.state->xmit)));
+        return s->tx_fifo_empty && uart_circ_empty(&s->port.state->xmit);
+}
+
+/* Function for stopping RX */
+static void max3107_stop_rx(struct uart_port *port)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+        unsigned long flags;
+
+        /* Set RX disabled in MODE 1 register */
+        spin_lock_irqsave(&s->data_lock, flags);
+        s->mode1_reg |= MAX3107_MODE1_RXDIS_BIT;
+        s->mode1_commit = 1;
+        spin_unlock_irqrestore(&s->data_lock, flags);
+        /* Set RX disabled */
+        s->rx_enabled = 0;
+        /* Trigger work thread for doing the actual configuration change */
+        max3107_dowork(s);
+}
+
+/* Function for returning control pin states */
+static unsigned int max3107_get_mctrl(struct uart_port *port)
+{
+        /* DCD and DSR are not wired and CTS/RTS is handled automatically
+         * so just indicate DSR and CAR asserted
+         */
+        return TIOCM_DSR | TIOCM_CAR;
+}
+
+/* Function for setting control pin states */
+static void max3107_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        /* DCD and DSR are not wired and CTS/RTS is hadnled automatically
+         * so do nothing
+         */
+}
+
+/* Function for configuring UART parameters */
+static void max3107_set_termios(struct uart_port *port,
+                                struct ktermios *termios,
+                                struct ktermios *old)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+        struct tty_struct *tty;
+        int baud;
+        u16 new_lcr = 0;
+        u32 new_brg = 0;
+        unsigned long flags;
+
+        if (!port->state)
+                return;
+
+        tty = port->state->port.tty;
+        if (!tty)
+                return;
+
+        /* Get new LCR register values */
+        /* Word size */
+        if ((termios->c_cflag & CSIZE) == CS7)
+                new_lcr |= MAX3107_LCR_WORD_LEN_7;
+        else
+                new_lcr |= MAX3107_LCR_WORD_LEN_8;
+
+        /* Parity */
+        if (termios->c_cflag & PARENB) {
+                new_lcr |= MAX3107_LCR_PARITY_BIT;
+                if (!(termios->c_cflag & PARODD))
+                        new_lcr |= MAX3107_LCR_EVENPARITY_BIT;
+        }
+
+        /* Stop bits */
+        if (termios->c_cflag & CSTOPB) {
+                /* 2 stop bits */
+                new_lcr |= MAX3107_LCR_STOPLEN_BIT;
+        }
+
+        /* Mask termios capabilities we don't support */
+        termios->c_cflag &= ~CMSPAR;
+
+        /* Set status ignore mask */
+        s->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                s->port.ignore_status_mask |= MAX3107_ALL_ERRORS;
+
+        /* Set low latency to immediately handle pushed data */
+        s->port.state->port.tty->low_latency = 1;
+
+        /* Get new baud rate generator configuration */
+        baud = tty_get_baud_rate(tty);
+
+        spin_lock_irqsave(&s->data_lock, flags);
+        new_brg = get_new_brg(baud, s);
+        /* if can't find the corrent config, use previous */
+        if (!new_brg) {
+                baud = s->baud;
+                new_brg = s->brg_cfg;
+        }
+        spin_unlock_irqrestore(&s->data_lock, flags);
+        tty_termios_encode_baud_rate(termios, baud, baud);
+        s->baud = baud;
+
+        /* Update timeout according to new baud rate */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        spin_lock_irqsave(&s->data_lock, flags);
+        if (s->lcr_reg != new_lcr) {
+                s->lcr_reg = new_lcr;
+                s->lcr_commit = 1;
+        }
+        if (s->brg_cfg != new_brg) {
+                s->brg_cfg = new_brg;
+                s->brg_commit = 1;
+        }
+        spin_unlock_irqrestore(&s->data_lock, flags);
+
+        /* Trigger work thread for doing the actual configuration change */
+        max3107_dowork(s);
+}
+
+/* Port shutdown function */
+static void max3107_shutdown(struct uart_port *port)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+
+        if (s->suspended && s->pdata->hw_suspend)
+                s->pdata->hw_suspend(s, 0);
+
+        /* Free the interrupt */
+        free_irq(s->spi->irq, s);
+
+        if (s->workqueue) {
+                /* Flush and destroy work queue */
+                flush_workqueue(s->workqueue);
+                destroy_workqueue(s->workqueue);
+                s->workqueue = NULL;
+        }
+
+        /* Suspend HW */
+        if (s->pdata->hw_suspend)
+                s->pdata->hw_suspend(s, 1);
+}
+
+/* Port startup function */
+static int max3107_startup(struct uart_port *port)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+
+        /* Initialize work queue */
+        s->workqueue = create_freezable_workqueue("max3107");
+        if (!s->workqueue) {
+                dev_err(&s->spi->dev, "Workqueue creation failed\n");
+                return -EBUSY;
+        }
+        INIT_WORK(&s->work, max3107_work);
+
+        /* Setup IRQ */
+        if (request_irq(s->spi->irq, max3107_irq, IRQF_TRIGGER_FALLING,
+                        "max3107", s)) {
+                dev_err(&s->spi->dev, "IRQ reguest failed\n");
+                destroy_workqueue(s->workqueue);
+                s->workqueue = NULL;
+                return -EBUSY;
+        }
+
+        /* Resume HW */
+        if (s->pdata->hw_suspend)
+                s->pdata->hw_suspend(s, 0);
+
+        /* Init registers */
+        max3107_register_init(s);
+
+        return 0;
+}
+
+/* Port type function */
+static const char *max3107_type(struct uart_port *port)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+        return s->spi->modalias;
+}
+
+/* Port release function */
+static void max3107_release_port(struct uart_port *port)
+{
+        /* Do nothing */
+}
+
+/* Port request function */
+static int max3107_request_port(struct uart_port *port)
+{
+        /* Do nothing */
+        return 0;
+}
+
+/* Port config function */
+static void max3107_config_port(struct uart_port *port, int flags)
+{
+        struct max3107_port *s = container_of(port, struct max3107_port, port);
+        s->port.type = PORT_MAX3107;
+}
+
+/* Port verify function */
+static int max3107_verify_port(struct uart_port *port,
+                                struct serial_struct *ser)
+{
+        if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3107)
+                return 0;
+
+        return -EINVAL;
+}
+
+/* Port stop TX function */
+static void max3107_stop_tx(struct uart_port *port)
+{
+        /* Do nothing */
+}
+
+/* Port break control function */
+static void max3107_break_ctl(struct uart_port *port, int break_state)
+{
+        /* We don't support break control, do nothing */
+}
+
+
+/* Port functions */
+static struct uart_ops max3107_ops = {
+        .tx_empty       = max3107_tx_empty,
+        .set_mctrl      = max3107_set_mctrl,
+        .get_mctrl      = max3107_get_mctrl,
+        .stop_tx        = max3107_stop_tx,
+        .start_tx       = max3107_start_tx,
+        .stop_rx        = max3107_stop_rx,
+        .enable_ms      = max3107_enable_ms,
+        .break_ctl      = max3107_break_ctl,
+        .startup        = max3107_startup,
+        .shutdown       = max3107_shutdown,
+        .set_termios    = max3107_set_termios,
+        .type           = max3107_type,
+        .release_port   = max3107_release_port,
+        .request_port   = max3107_request_port,
+        .config_port    = max3107_config_port,
+        .verify_port    = max3107_verify_port,
+};
+
+/* UART driver data */
+static struct uart_driver max3107_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "ttyMAX",
+        .dev_name       = "ttyMAX",
+        .nr             = 1,
+};
+
+static int driver_registered = 0;
+
+
+
+/* 'Generic' platform data */
+static struct max3107_plat generic_plat_data = {
+        .loopback               = 0,
+        .ext_clk                = 1,
+        .hw_suspend             = max3107_hw_susp,
+        .polled_mode            = 0,
+        .poll_time              = 0,
+};
+
+
+/*******************************************************************/
+
+/**
+ *      max3107_probe           -       SPI bus probe entry point
+ *      @spi: the spi device
+ *
+ *      SPI wants us to probe this device and if appropriate claim it.
+ *      Perform any platform specific requirements and then initialise
+ *      the device.
+ */
+
+int max3107_probe(struct spi_device *spi, struct max3107_plat *pdata)
+{
+        struct max3107_port *s;
+        u16 buf[2];     /* Buffer for SPI transfers */
+        int retval;
+
+        pr_info("enter max3107 probe\n");
+
+        /* Allocate port structure */
+        s = kzalloc(sizeof(*s), GFP_KERNEL);
+        if (!s) {
+                pr_err("Allocating port structure failed\n");
+                return -ENOMEM;
+        }
+
+        s->pdata = pdata;
+
+        /* SPI Rx buffer
+         * +2 for RX FIFO interrupt
+         * disabling and RX level query
+         */
+        s->rxbuf = kzalloc(sizeof(u16) * (MAX3107_RX_FIFO_SIZE+2), GFP_KERNEL);
+        if (!s->rxbuf) {
+                pr_err("Allocating RX buffer failed\n");
+                retval = -ENOMEM;
+                goto err_free4;
+        }
+        s->rxstr = kzalloc(sizeof(u8) * MAX3107_RX_FIFO_SIZE, GFP_KERNEL);
+        if (!s->rxstr) {
+                pr_err("Allocating RX buffer failed\n");
+                retval = -ENOMEM;
+                goto err_free3;
+        }
+        /* SPI Tx buffer
+         * SPI transfer buffer
+         * +3 for TX FIFO empty
+         * interrupt disabling and
+         * enabling and TX enabling
+         */
+        s->txbuf = kzalloc(sizeof(u16) * MAX3107_TX_FIFO_SIZE + 3, GFP_KERNEL);
+        if (!s->txbuf) {
+                pr_err("Allocating TX buffer failed\n");
+                retval = -ENOMEM;
+                goto err_free2;
+        }
+        /* Initialize shared data lock */
+        spin_lock_init(&s->data_lock);
+
+        /* SPI intializations */
+        dev_set_drvdata(&spi->dev, s);
+        spi->mode = SPI_MODE_0;
+        spi->dev.platform_data = pdata;
+        spi->bits_per_word = 16;
+        s->ext_clk = pdata->ext_clk;
+        s->loopback = pdata->loopback;
+        spi_setup(spi);
+        s->spi = spi;
+
+        /* Check REV ID to ensure we are talking to what we expect */
+        buf[0] = MAX3107_REVID_REG;
+        if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) {
+                dev_err(&s->spi->dev, "SPI transfer for REVID read failed\n");
+                retval = -EIO;
+                goto err_free1;
+        }
+        if ((buf[0] & MAX3107_SPI_RX_DATA_MASK) != MAX3107_REVID1 &&
+                (buf[0] & MAX3107_SPI_RX_DATA_MASK) != MAX3107_REVID2) {
+                dev_err(&s->spi->dev, "REVID %x does not match\n",
+                                (buf[0] & MAX3107_SPI_RX_DATA_MASK));
+                retval = -ENODEV;
+                goto err_free1;
+        }
+
+        /* Disable all interrupts */
+        buf[0] = (MAX3107_WRITE_BIT | MAX3107_IRQEN_REG | 0x0000);
+        buf[0] |= 0x0000;
+
+        /* Configure clock source */
+        buf[1] = (MAX3107_WRITE_BIT | MAX3107_CLKSRC_REG);
+        if (s->ext_clk) {
+                /* External clock */
+                buf[1] |= MAX3107_CLKSRC_EXTCLK_BIT;
+        }
+
+        /* PLL bypass ON */
+        buf[1] |= MAX3107_CLKSRC_PLLBYP_BIT;
+
+        /* Perform SPI transfer */
+        if (max3107_rw(s, (u8 *)buf, NULL, 4)) {
+                dev_err(&s->spi->dev, "SPI transfer for init failed\n");
+                retval = -EIO;
+                goto err_free1;
+        }
+
+        /* Register UART driver */
+        if (!driver_registered) {
+                retval = uart_register_driver(&max3107_uart_driver);
+                if (retval) {
+                        dev_err(&s->spi->dev, "Registering UART driver failed\n");
+                        goto err_free1;
+                }
+                driver_registered = 1;
+        }
+
+        /* Initialize UART port data */
+        s->port.fifosize = 128;
+        s->port.ops = &max3107_ops;
+        s->port.line = 0;
+        s->port.dev = &spi->dev;
+        s->port.uartclk = 9600;
+        s->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
+        s->port.irq = s->spi->irq;
+        s->port.type = PORT_MAX3107;
+
+        /* Add UART port */
+        retval = uart_add_one_port(&max3107_uart_driver, &s->port);
+        if (retval < 0) {
+                dev_err(&s->spi->dev, "Adding UART port failed\n");
+                goto err_free1;
+        }
+
+        if (pdata->configure) {
+                retval = pdata->configure(s);
+                if (retval < 0)
+                        goto err_free1;
+        }
+
+        /* Go to suspend mode */
+        if (pdata->hw_suspend)
+                pdata->hw_suspend(s, 1);
+
+        return 0;
+
+err_free1:
+        kfree(s->txbuf);
+err_free2:
+        kfree(s->rxstr);
+err_free3:
+        kfree(s->rxbuf);
+err_free4:
+        kfree(s);
+        return retval;
+}
+EXPORT_SYMBOL_GPL(max3107_probe);
+
+/* Driver remove function */
+int max3107_remove(struct spi_device *spi)
+{
+        struct max3107_port *s = dev_get_drvdata(&spi->dev);
+
+        pr_info("enter max3107 remove\n");
+
+        /* Remove port */
+        if (uart_remove_one_port(&max3107_uart_driver, &s->port))
+                dev_warn(&s->spi->dev, "Removing UART port failed\n");
+
+
+        /* Free TxRx buffer */
+        kfree(s->rxbuf);
+        kfree(s->rxstr);
+        kfree(s->txbuf);
+
+        /* Free port structure */
+        kfree(s);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(max3107_remove);
+
+/* Driver suspend function */
+int max3107_suspend(struct spi_device *spi, pm_message_t state)
+{
+#ifdef CONFIG_PM
+        struct max3107_port *s = dev_get_drvdata(&spi->dev);
+
+        pr_debug("enter suspend\n");
+
+        /* Suspend UART port */
+        uart_suspend_port(&max3107_uart_driver, &s->port);
+
+        /* Go to suspend mode */
+        if (s->pdata->hw_suspend)
+                s->pdata->hw_suspend(s, 1);
+#endif  /* CONFIG_PM */
+        return 0;
+}
+EXPORT_SYMBOL_GPL(max3107_suspend);
+
+/* Driver resume function */
+int max3107_resume(struct spi_device *spi)
+{
+#ifdef CONFIG_PM
+        struct max3107_port *s = dev_get_drvdata(&spi->dev);
+
+        pr_debug("enter resume\n");
+
+        /* Resume from suspend */
+        if (s->pdata->hw_suspend)
+                s->pdata->hw_suspend(s, 0);
+
+        /* Resume UART port */
+        uart_resume_port(&max3107_uart_driver, &s->port);
+#endif  /* CONFIG_PM */
+        return 0;
+}
+EXPORT_SYMBOL_GPL(max3107_resume);
+
+static int max3107_probe_generic(struct spi_device *spi)
+{
+        return max3107_probe(spi, &generic_plat_data);
+}
+
+/* Spi driver data */
+static struct spi_driver max3107_driver = {
+        .driver = {
+                .name           = "max3107",
+                .bus            = &spi_bus_type,
+                .owner          = THIS_MODULE,
+        },
+        .probe          = max3107_probe_generic,
+        .remove         = __devexit_p(max3107_remove),
+        .suspend        = max3107_suspend,
+        .resume         = max3107_resume,
+};
+
+/* Driver init function */
+static int __init max3107_init(void)
+{
+        pr_info("enter max3107 init\n");
+        return spi_register_driver(&max3107_driver);
+}
+
+/* Driver exit function */
+static void __exit max3107_exit(void)
+{
+        pr_info("enter max3107 exit\n");
+        /* Unregister UART driver */
+        if (driver_registered)
+                uart_unregister_driver(&max3107_uart_driver);
+        spi_unregister_driver(&max3107_driver);
+}
+
+module_init(max3107_init);
+module_exit(max3107_exit);
+
+MODULE_DESCRIPTION("MAX3107 driver");
+MODULE_AUTHOR("Aavamobile");
+MODULE_ALIAS("max3107-spi");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/max3107.h b/drivers/tty/serial/max3107.h
new file mode 100644
index 000000000000..8415fc723b96
--- /dev/null
+++ b/drivers/tty/serial/max3107.h
@@ -0,0 +1,441 @@
+/*
+ * max3107.h - spi uart protocol driver header for Maxim 3107
+ *
+ * Copyright (C) Aavamobile 2009
+ * Based on serial_max3100.h by Christian Pellegrin
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _MAX3107_H
+#define _MAX3107_H
+
+/* Serial error status definitions */
+#define MAX3107_PARITY_ERROR    1
+#define MAX3107_FRAME_ERROR     2
+#define MAX3107_OVERRUN_ERROR   4
+#define MAX3107_ALL_ERRORS      (MAX3107_PARITY_ERROR | \
+                                 MAX3107_FRAME_ERROR | \
+                                 MAX3107_OVERRUN_ERROR)
+
+/* GPIO definitions */
+#define MAX3107_GPIO_BASE       88
+#define MAX3107_GPIO_COUNT      4
+
+
+/* GPIO connected to chip's reset pin */
+#define MAX3107_RESET_GPIO      87
+
+
+/* Chip reset delay */
+#define MAX3107_RESET_DELAY     10
+
+/* Chip wakeup delay */
+#define MAX3107_WAKEUP_DELAY    50
+
+
+/* Sleep mode definitions */
+#define MAX3107_DISABLE_FORCED_SLEEP    0
+#define MAX3107_ENABLE_FORCED_SLEEP     1
+#define MAX3107_DISABLE_AUTOSLEEP       2
+#define MAX3107_ENABLE_AUTOSLEEP        3
+
+
+/* Definitions for register access with SPI transfers
+ *
+ * SPI transfer format:
+ *
+ * Master to slave bits xzzzzzzzyyyyyyyy
+ * Slave to master bits aaaaaaaabbbbbbbb
+ *
+ * where:
+ * x = 0 for reads, 1 for writes
+ * z = register address
+ * y = new register value if write, 0 if read
+ * a = unspecified
+ * b = register value if read, unspecified if write
+ */
+
+/* SPI speed */
+#define MAX3107_SPI_SPEED       (3125000 * 2)
+
+/* Write bit */
+#define MAX3107_WRITE_BIT       (1 << 15)
+
+/* SPI TX data mask */
+#define MAX3107_SPI_RX_DATA_MASK        (0x00ff)
+
+/* SPI RX data mask */
+#define MAX3107_SPI_TX_DATA_MASK        (0x00ff)
+
+/* Register access masks */
+#define MAX3107_RHR_REG                 (0x0000) /* RX FIFO */
+#define MAX3107_THR_REG                 (0x0000) /* TX FIFO */
+#define MAX3107_IRQEN_REG               (0x0100) /* IRQ enable */
+#define MAX3107_IRQSTS_REG              (0x0200) /* IRQ status */
+#define MAX3107_LSR_IRQEN_REG           (0x0300) /* LSR IRQ enable */
+#define MAX3107_LSR_IRQSTS_REG          (0x0400) /* LSR IRQ status */
+#define MAX3107_SPCHR_IRQEN_REG         (0x0500) /* Special char IRQ enable */
+#define MAX3107_SPCHR_IRQSTS_REG        (0x0600) /* Special char IRQ status */
+#define MAX3107_STS_IRQEN_REG           (0x0700) /* Status IRQ enable */
+#define MAX3107_STS_IRQSTS_REG          (0x0800) /* Status IRQ status */
+#define MAX3107_MODE1_REG               (0x0900) /* MODE1 */
+#define MAX3107_MODE2_REG               (0x0a00) /* MODE2 */
+#define MAX3107_LCR_REG                 (0x0b00) /* LCR */
+#define MAX3107_RXTO_REG                (0x0c00) /* RX timeout */
+#define MAX3107_HDPIXDELAY_REG          (0x0d00) /* Auto transceiver delays */
+#define MAX3107_IRDA_REG                (0x0e00) /* IRDA settings */
+#define MAX3107_FLOWLVL_REG             (0x0f00) /* Flow control levels */
+#define MAX3107_FIFOTRIGLVL_REG         (0x1000) /* FIFO IRQ trigger levels */
+#define MAX3107_TXFIFOLVL_REG           (0x1100) /* TX FIFO level */
+#define MAX3107_RXFIFOLVL_REG           (0x1200) /* RX FIFO level */
+#define MAX3107_FLOWCTRL_REG            (0x1300) /* Flow control */
+#define MAX3107_XON1_REG                (0x1400) /* XON1 character */
+#define MAX3107_XON2_REG                (0x1500) /* XON2 character */
+#define MAX3107_XOFF1_REG               (0x1600) /* XOFF1 character */
+#define MAX3107_XOFF2_REG               (0x1700) /* XOFF2 character */
+#define MAX3107_GPIOCFG_REG             (0x1800) /* GPIO config */
+#define MAX3107_GPIODATA_REG            (0x1900) /* GPIO data */
+#define MAX3107_PLLCFG_REG              (0x1a00) /* PLL config */
+#define MAX3107_BRGCFG_REG              (0x1b00) /* Baud rate generator conf */
+#define MAX3107_BRGDIVLSB_REG           (0x1c00) /* Baud rate divisor LSB */
+#define MAX3107_BRGDIVMSB_REG           (0x1d00) /* Baud rate divisor MSB */
+#define MAX3107_CLKSRC_REG              (0x1e00) /* Clock source */
+#define MAX3107_REVID_REG               (0x1f00) /* Revision identification */
+
+/* IRQ register bits */
+#define MAX3107_IRQ_LSR_BIT     (1 << 0) /* LSR interrupt */
+#define MAX3107_IRQ_SPCHR_BIT   (1 << 1) /* Special char interrupt */
+#define MAX3107_IRQ_STS_BIT     (1 << 2) /* Status interrupt */
+#define MAX3107_IRQ_RXFIFO_BIT  (1 << 3) /* RX FIFO interrupt */
+#define MAX3107_IRQ_TXFIFO_BIT  (1 << 4) /* TX FIFO interrupt */
+#define MAX3107_IRQ_TXEMPTY_BIT (1 << 5) /* TX FIFO empty interrupt */
+#define MAX3107_IRQ_RXEMPTY_BIT (1 << 6) /* RX FIFO empty interrupt */
+#define MAX3107_IRQ_CTS_BIT     (1 << 7) /* CTS interrupt */
+
+/* LSR register bits */
+#define MAX3107_LSR_RXTO_BIT    (1 << 0) /* RX timeout */
+#define MAX3107_LSR_RXOVR_BIT   (1 << 1) /* RX overrun */
+#define MAX3107_LSR_RXPAR_BIT   (1 << 2) /* RX parity error */
+#define MAX3107_LSR_FRERR_BIT   (1 << 3) /* Frame error */
+#define MAX3107_LSR_RXBRK_BIT   (1 << 4) /* RX break */
+#define MAX3107_LSR_RXNOISE_BIT (1 << 5) /* RX noise */
+#define MAX3107_LSR_UNDEF6_BIT  (1 << 6) /* Undefined/not used */
+#define MAX3107_LSR_CTS_BIT     (1 << 7) /* CTS pin state */
+
+/* Special character register bits */
+#define MAX3107_SPCHR_XON1_BIT          (1 << 0) /* XON1 character */
+#define MAX3107_SPCHR_XON2_BIT          (1 << 1) /* XON2 character */
+#define MAX3107_SPCHR_XOFF1_BIT         (1 << 2) /* XOFF1 character */
+#define MAX3107_SPCHR_XOFF2_BIT         (1 << 3) /* XOFF2 character */
+#define MAX3107_SPCHR_BREAK_BIT         (1 << 4) /* RX break */
+#define MAX3107_SPCHR_MULTIDROP_BIT     (1 << 5) /* 9-bit multidrop addr char */
+#define MAX3107_SPCHR_UNDEF6_BIT        (1 << 6) /* Undefined/not used */
+#define MAX3107_SPCHR_UNDEF7_BIT        (1 << 7) /* Undefined/not used */
+
+/* Status register bits */
+#define MAX3107_STS_GPIO0_BIT           (1 << 0) /* GPIO 0 interrupt */
+#define MAX3107_STS_GPIO1_BIT           (1 << 1) /* GPIO 1 interrupt */
+#define MAX3107_STS_GPIO2_BIT           (1 << 2) /* GPIO 2 interrupt */
+#define MAX3107_STS_GPIO3_BIT           (1 << 3) /* GPIO 3 interrupt */
+#define MAX3107_STS_UNDEF4_BIT          (1 << 4) /* Undefined/not used */
+#define MAX3107_STS_CLKREADY_BIT        (1 << 5) /* Clock ready */
+#define MAX3107_STS_SLEEP_BIT           (1 << 6) /* Sleep interrupt */
+#define MAX3107_STS_UNDEF7_BIT          (1 << 7) /* Undefined/not used */
+
+/* MODE1 register bits */
+#define MAX3107_MODE1_RXDIS_BIT         (1 << 0) /* RX disable */
+#define MAX3107_MODE1_TXDIS_BIT         (1 << 1) /* TX disable */
+#define MAX3107_MODE1_TXHIZ_BIT         (1 << 2) /* TX pin three-state */
+#define MAX3107_MODE1_RTSHIZ_BIT        (1 << 3) /* RTS pin three-state */
+#define MAX3107_MODE1_TRNSCVCTRL_BIT    (1 << 4) /* Transceiver ctrl enable */
+#define MAX3107_MODE1_FORCESLEEP_BIT    (1 << 5) /* Force sleep mode */
+#define MAX3107_MODE1_AUTOSLEEP_BIT     (1 << 6) /* Auto sleep enable */
+#define MAX3107_MODE1_IRQSEL_BIT        (1 << 7) /* IRQ pin enable */
+
+/* MODE2 register bits */
+#define MAX3107_MODE2_RST_BIT           (1 << 0) /* Chip reset */
+#define MAX3107_MODE2_FIFORST_BIT       (1 << 1) /* FIFO reset */
+#define MAX3107_MODE2_RXTRIGINV_BIT     (1 << 2) /* RX FIFO INT invert */
+#define MAX3107_MODE2_RXEMPTINV_BIT     (1 << 3) /* RX FIFO empty INT invert */
+#define MAX3107_MODE2_SPCHR_BIT         (1 << 4) /* Special chr detect enable */
+#define MAX3107_MODE2_LOOPBACK_BIT      (1 << 5) /* Internal loopback enable */
+#define MAX3107_MODE2_MULTIDROP_BIT     (1 << 6) /* 9-bit multidrop enable */
+#define MAX3107_MODE2_ECHOSUPR_BIT      (1 << 7) /* ECHO suppression enable */
+
+/* LCR register bits */
+#define MAX3107_LCR_LENGTH0_BIT         (1 << 0) /* Word length bit 0 */
+#define MAX3107_LCR_LENGTH1_BIT         (1 << 1) /* Word length bit 1
+                                                  *
+                                                  * Word length bits table:
+                                                  * 00 -> 5 bit words
+                                                  * 01 -> 6 bit words
+                                                  * 10 -> 7 bit words
+                                                  * 11 -> 8 bit words
+                                                  */
+#define MAX3107_LCR_STOPLEN_BIT         (1 << 2) /* STOP length bit
+                                                  *
+                                                  * STOP length bit table:
+                                                  * 0 -> 1 stop bit
+                                                  * 1 -> 1-1.5 stop bits if
+                                                  *      word length is 5,
+                                                  *      2 stop bits otherwise
+                                                  */
+#define MAX3107_LCR_PARITY_BIT          (1 << 3) /* Parity bit enable */
+#define MAX3107_LCR_EVENPARITY_BIT      (1 << 4) /* Even parity bit enable */
+#define MAX3107_LCR_FORCEPARITY_BIT     (1 << 5) /* 9-bit multidrop parity */
+#define MAX3107_LCR_TXBREAK_BIT         (1 << 6) /* TX break enable */
+#define MAX3107_LCR_RTS_BIT             (1 << 7) /* RTS pin control */
+#define MAX3107_LCR_WORD_LEN_5          (0x0000)
+#define MAX3107_LCR_WORD_LEN_6          (0x0001)
+#define MAX3107_LCR_WORD_LEN_7          (0x0002)
+#define MAX3107_LCR_WORD_LEN_8          (0x0003)
+
+
+/* IRDA register bits */
+#define MAX3107_IRDA_IRDAEN_BIT         (1 << 0) /* IRDA mode enable */
+#define MAX3107_IRDA_SIR_BIT            (1 << 1) /* SIR mode enable */
+#define MAX3107_IRDA_SHORTIR_BIT        (1 << 2) /* Short SIR mode enable */
+#define MAX3107_IRDA_MIR_BIT            (1 << 3) /* MIR mode enable */
+#define MAX3107_IRDA_RXINV_BIT          (1 << 4) /* RX logic inversion enable */
+#define MAX3107_IRDA_TXINV_BIT          (1 << 5) /* TX logic inversion enable */
+#define MAX3107_IRDA_UNDEF6_BIT         (1 << 6) /* Undefined/not used */
+#define MAX3107_IRDA_UNDEF7_BIT         (1 << 7) /* Undefined/not used */
+
+/* Flow control trigger level register masks */
+#define MAX3107_FLOWLVL_HALT_MASK       (0x000f) /* Flow control halt level */
+#define MAX3107_FLOWLVL_RES_MASK        (0x00f0) /* Flow control resume level */
+#define MAX3107_FLOWLVL_HALT(words)     ((words/8) & 0x000f)
+#define MAX3107_FLOWLVL_RES(words)      (((words/8) & 0x000f) << 4)
+
+/* FIFO interrupt trigger level register masks */
+#define MAX3107_FIFOTRIGLVL_TX_MASK     (0x000f) /* TX FIFO trigger level */
+#define MAX3107_FIFOTRIGLVL_RX_MASK     (0x00f0) /* RX FIFO trigger level */
+#define MAX3107_FIFOTRIGLVL_TX(words)   ((words/8) & 0x000f)
+#define MAX3107_FIFOTRIGLVL_RX(words)   (((words/8) & 0x000f) << 4)
+
+/* Flow control register bits */
+#define MAX3107_FLOWCTRL_AUTORTS_BIT    (1 << 0) /* Auto RTS flow ctrl enable */
+#define MAX3107_FLOWCTRL_AUTOCTS_BIT    (1 << 1) /* Auto CTS flow ctrl enable */
+#define MAX3107_FLOWCTRL_GPIADDR_BIT    (1 << 2) /* Enables that GPIO inputs
+                                                  * are used in conjunction with
+                                                  * XOFF2 for definition of
+                                                  * special character */
+#define MAX3107_FLOWCTRL_SWFLOWEN_BIT   (1 << 3) /* Auto SW flow ctrl enable */
+#define MAX3107_FLOWCTRL_SWFLOW0_BIT    (1 << 4) /* SWFLOW bit 0 */
+#define MAX3107_FLOWCTRL_SWFLOW1_BIT    (1 << 5) /* SWFLOW bit 1
+                                                  *
+                                                  * SWFLOW bits 1 & 0 table:
+                                                  * 00 -> no transmitter flow
+                                                  *       control
+                                                  * 01 -> receiver compares
+                                                  *       XON2 and XOFF2
+                                                  *       and controls
+                                                  *       transmitter
+                                                  * 10 -> receiver compares
+                                                  *       XON1 and XOFF1
+                                                  *       and controls
+                                                  *       transmitter
+                                                  * 11 -> receiver compares
+                                                  *       XON1, XON2, XOFF1 and
+                                                  *       XOFF2 and controls
+                                                  *       transmitter
+                                                  */
+#define MAX3107_FLOWCTRL_SWFLOW2_BIT    (1 << 6) /* SWFLOW bit 2 */
+#define MAX3107_FLOWCTRL_SWFLOW3_BIT    (1 << 7) /* SWFLOW bit 3
+                                                  *
+                                                  * SWFLOW bits 3 & 2 table:
+                                                  * 00 -> no received flow
+                                                  *       control
+                                                  * 01 -> transmitter generates
+                                                  *       XON2 and XOFF2
+                                                  * 10 -> transmitter generates
+                                                  *       XON1 and XOFF1
+                                                  * 11 -> transmitter generates
+                                                  *       XON1, XON2, XOFF1 and
+                                                  *       XOFF2
+                                                  */
+
+/* GPIO configuration register bits */
+#define MAX3107_GPIOCFG_GP0OUT_BIT      (1 << 0) /* GPIO 0 output enable */
+#define MAX3107_GPIOCFG_GP1OUT_BIT      (1 << 1) /* GPIO 1 output enable */
+#define MAX3107_GPIOCFG_GP2OUT_BIT      (1 << 2) /* GPIO 2 output enable */
+#define MAX3107_GPIOCFG_GP3OUT_BIT      (1 << 3) /* GPIO 3 output enable */
+#define MAX3107_GPIOCFG_GP0OD_BIT       (1 << 4) /* GPIO 0 open-drain enable */
+#define MAX3107_GPIOCFG_GP1OD_BIT       (1 << 5) /* GPIO 1 open-drain enable */
+#define MAX3107_GPIOCFG_GP2OD_BIT       (1 << 6) /* GPIO 2 open-drain enable */
+#define MAX3107_GPIOCFG_GP3OD_BIT       (1 << 7) /* GPIO 3 open-drain enable */
+
+/* GPIO DATA register bits */
+#define MAX3107_GPIODATA_GP0OUT_BIT     (1 << 0) /* GPIO 0 output value */
+#define MAX3107_GPIODATA_GP1OUT_BIT     (1 << 1) /* GPIO 1 output value */
+#define MAX3107_GPIODATA_GP2OUT_BIT     (1 << 2) /* GPIO 2 output value */
+#define MAX3107_GPIODATA_GP3OUT_BIT     (1 << 3) /* GPIO 3 output value */
+#define MAX3107_GPIODATA_GP0IN_BIT      (1 << 4) /* GPIO 0 input value */
+#define MAX3107_GPIODATA_GP1IN_BIT      (1 << 5) /* GPIO 1 input value */
+#define MAX3107_GPIODATA_GP2IN_BIT      (1 << 6) /* GPIO 2 input value */
+#define MAX3107_GPIODATA_GP3IN_BIT      (1 << 7) /* GPIO 3 input value */
+
+/* PLL configuration register masks */
+#define MAX3107_PLLCFG_PREDIV_MASK      (0x003f) /* PLL predivision value */
+#define MAX3107_PLLCFG_PLLFACTOR_MASK   (0x00c0) /* PLL multiplication factor */
+
+/* Baud rate generator configuration register masks and bits */
+#define MAX3107_BRGCFG_FRACT_MASK       (0x000f) /* Fractional portion of
+                                                  * Baud rate generator divisor
+                                                  */
+#define MAX3107_BRGCFG_2XMODE_BIT       (1 << 4) /* Double baud rate */
+#define MAX3107_BRGCFG_4XMODE_BIT       (1 << 5) /* Quadruple baud rate */
+#define MAX3107_BRGCFG_UNDEF6_BIT       (1 << 6) /* Undefined/not used */
+#define MAX3107_BRGCFG_UNDEF7_BIT       (1 << 7) /* Undefined/not used */
+
+/* Clock source register bits */
+#define MAX3107_CLKSRC_INTOSC_BIT       (1 << 0) /* Internal osc enable */
+#define MAX3107_CLKSRC_CRYST_BIT        (1 << 1) /* Crystal osc enable */
+#define MAX3107_CLKSRC_PLL_BIT          (1 << 2) /* PLL enable */
+#define MAX3107_CLKSRC_PLLBYP_BIT       (1 << 3) /* PLL bypass */
+#define MAX3107_CLKSRC_EXTCLK_BIT       (1 << 4) /* External clock enable */
+#define MAX3107_CLKSRC_UNDEF5_BIT       (1 << 5) /* Undefined/not used */
+#define MAX3107_CLKSRC_UNDEF6_BIT       (1 << 6) /* Undefined/not used */
+#define MAX3107_CLKSRC_CLK2RTS_BIT      (1 << 7) /* Baud clk to RTS pin */
+
+
+/* HW definitions */
+#define MAX3107_RX_FIFO_SIZE    128
+#define MAX3107_TX_FIFO_SIZE    128
+#define MAX3107_REVID1          0x00a0
+#define MAX3107_REVID2          0x00a1
+
+
+/* Baud rate generator configuration values for external clock 13MHz */
+#define MAX3107_BRG13_B300      (0x0A9400 | 0x05)
+#define MAX3107_BRG13_B600      (0x054A00 | 0x03)
+#define MAX3107_BRG13_B1200     (0x02A500 | 0x01)
+#define MAX3107_BRG13_B2400     (0x015200 | 0x09)
+#define MAX3107_BRG13_B4800     (0x00A900 | 0x04)
+#define MAX3107_BRG13_B9600     (0x005400 | 0x0A)
+#define MAX3107_BRG13_B19200    (0x002A00 | 0x05)
+#define MAX3107_BRG13_B38400    (0x001500 | 0x03)
+#define MAX3107_BRG13_B57600    (0x000E00 | 0x02)
+#define MAX3107_BRG13_B115200   (0x000700 | 0x01)
+#define MAX3107_BRG13_B230400   (0x000300 | 0x08)
+#define MAX3107_BRG13_B460800   (0x000100 | 0x0c)
+#define MAX3107_BRG13_B921600   (0x000100 | 0x1c)
+
+/* Baud rate generator configuration values for external clock 26MHz */
+#define MAX3107_BRG26_B300      (0x152800 | 0x0A)
+#define MAX3107_BRG26_B600      (0x0A9400 | 0x05)
+#define MAX3107_BRG26_B1200     (0x054A00 | 0x03)
+#define MAX3107_BRG26_B2400     (0x02A500 | 0x01)
+#define MAX3107_BRG26_B4800     (0x015200 | 0x09)
+#define MAX3107_BRG26_B9600     (0x00A900 | 0x04)
+#define MAX3107_BRG26_B19200    (0x005400 | 0x0A)
+#define MAX3107_BRG26_B38400    (0x002A00 | 0x05)
+#define MAX3107_BRG26_B57600    (0x001C00 | 0x03)
+#define MAX3107_BRG26_B115200   (0x000E00 | 0x02)
+#define MAX3107_BRG26_B230400   (0x000700 | 0x01)
+#define MAX3107_BRG26_B460800   (0x000300 | 0x08)
+#define MAX3107_BRG26_B921600   (0x000100 | 0x0C)
+
+/* Baud rate generator configuration values for internal clock */
+#define MAX3107_BRG13_IB300     (0x008000 | 0x00)
+#define MAX3107_BRG13_IB600     (0x004000 | 0x00)
+#define MAX3107_BRG13_IB1200    (0x002000 | 0x00)
+#define MAX3107_BRG13_IB2400    (0x001000 | 0x00)
+#define MAX3107_BRG13_IB4800    (0x000800 | 0x00)
+#define MAX3107_BRG13_IB9600    (0x000400 | 0x00)
+#define MAX3107_BRG13_IB19200   (0x000200 | 0x00)
+#define MAX3107_BRG13_IB38400   (0x000100 | 0x00)
+#define MAX3107_BRG13_IB57600   (0x000000 | 0x0B)
+#define MAX3107_BRG13_IB115200  (0x000000 | 0x05)
+#define MAX3107_BRG13_IB230400  (0x000000 | 0x03)
+#define MAX3107_BRG13_IB460800  (0x000000 | 0x00)
+#define MAX3107_BRG13_IB921600  (0x000000 | 0x00)
+
+
+struct baud_table {
+        int baud;
+        u32 new_brg;
+};
+
+struct max3107_port {
+        /* UART port structure */
+        struct uart_port port;
+
+        /* SPI device structure */
+        struct spi_device *spi;
+
+#if defined(CONFIG_GPIOLIB)
+        /* GPIO chip structure */
+        struct gpio_chip chip;
+#endif
+
+        /* Workqueue that does all the magic */
+        struct workqueue_struct *workqueue;
+        struct work_struct work;
+
+        /* Lock for shared data */
+        spinlock_t data_lock;
+
+        /* Device configuration */
+        int ext_clk;            /* 1 if external clock used */
+        int loopback;           /* Current loopback mode state */
+        int baud;                       /* Current baud rate */
+
+        /* State flags */
+        int suspended;          /* Indicates suspend mode */
+        int tx_fifo_empty;      /* Flag for TX FIFO state */
+        int rx_enabled;         /* Flag for receiver state */
+        int tx_enabled;         /* Flag for transmitter state */
+
+        u16 irqen_reg;          /* Current IRQ enable register value */
+        /* Shared data */
+        u16 mode1_reg;          /* Current mode1 register value*/
+        int mode1_commit;       /* Flag for setting new mode1 register value */
+        u16 lcr_reg;            /* Current LCR register value */
+        int lcr_commit;         /* Flag for setting new LCR register value */
+        u32 brg_cfg;            /* Current Baud rate generator config  */
+        int brg_commit;         /* Flag for setting new baud rate generator
+                                 * config
+                                 */
+        struct baud_table *baud_tbl;
+        int handle_irq;         /* Indicates that IRQ should be handled */
+
+        /* Rx buffer and str*/
+        u16 *rxbuf;
+        u8  *rxstr;
+        /* Tx buffer*/
+        u16 *txbuf;
+
+        struct max3107_plat *pdata;     /* Platform data */
+};
+
+/* Platform data structure */
+struct max3107_plat {
+        /* Loopback mode enable */
+        int loopback;
+        /* External clock enable */
+        int ext_clk;
+        /* Called during the register initialisation */
+        void (*init)(struct max3107_port *s);
+        /* Called when the port is found and configured */
+        int (*configure)(struct max3107_port *s);
+        /* HW suspend function */
+        void (*hw_suspend) (struct max3107_port *s, int suspend);
+        /* Polling mode enable */
+        int polled_mode;
+        /* Polling period if polling mode enabled */
+        int poll_time;
+};
+
+extern int max3107_rw(struct max3107_port *s, u8 *tx, u8 *rx, int len);
+extern void max3107_hw_susp(struct max3107_port *s, int suspend);
+extern int max3107_probe(struct spi_device *spi, struct max3107_plat *pdata);
+extern int max3107_remove(struct spi_device *spi);
+extern int max3107_suspend(struct spi_device *spi, pm_message_t state);
+extern int max3107_resume(struct spi_device *spi);
+
+#endif /* _LINUX_SERIAL_MAX3107_H */
diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
new file mode 100644
index 000000000000..3394b7cc1722
--- /dev/null
+++ b/drivers/tty/serial/mcf.c
@@ -0,0 +1,662 @@
+/****************************************************************************/
+
+/*
+ *      mcf.c -- Freescale ColdFire UART driver
+ *
+ *      (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/****************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/io.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/mcfuart.h>
+#include <asm/nettel.h>
+
+/****************************************************************************/
+
+/*
+ *      Some boards implement the DTR/DCD lines using GPIO lines, most
+ *      don't. Dummy out the access macros for those that don't. Those
+ *      that do should define these macros somewhere in there board
+ *      specific inlude files.
+ */
+#if !defined(mcf_getppdcd)
+#define mcf_getppdcd(p)         (1)
+#endif
+#if !defined(mcf_getppdtr)
+#define mcf_getppdtr(p)         (1)
+#endif
+#if !defined(mcf_setppdtr)
+#define mcf_setppdtr(p, v)      do { } while (0)
+#endif
+
+/****************************************************************************/
+
+/*
+ *      Local per-uart structure.
+ */
+struct mcf_uart {
+        struct uart_port        port;
+        unsigned int            sigs;           /* Local copy of line sigs */
+        unsigned char           imr;            /* Local IMR mirror */
+};
+
+/****************************************************************************/
+
+static unsigned int mcf_tx_empty(struct uart_port *port)
+{
+        return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
+                TIOCSER_TEMT : 0;
+}
+
+/****************************************************************************/
+
+static unsigned int mcf_get_mctrl(struct uart_port *port)
+{
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+        unsigned int sigs;
+
+        sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
+                0 : TIOCM_CTS;
+        sigs |= (pp->sigs & TIOCM_RTS);
+        sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
+        sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
+
+        return sigs;
+}
+
+/****************************************************************************/
+
+static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
+{
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+
+        pp->sigs = sigs;
+        mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
+        if (sigs & TIOCM_RTS)
+                writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
+        else
+                writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
+}
+
+/****************************************************************************/
+
+static void mcf_start_tx(struct uart_port *port)
+{
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+
+        pp->imr |= MCFUART_UIR_TXREADY;
+        writeb(pp->imr, port->membase + MCFUART_UIMR);
+}
+
+/****************************************************************************/
+
+static void mcf_stop_tx(struct uart_port *port)
+{
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+
+        pp->imr &= ~MCFUART_UIR_TXREADY;
+        writeb(pp->imr, port->membase + MCFUART_UIMR);
+}
+
+/****************************************************************************/
+
+static void mcf_stop_rx(struct uart_port *port)
+{
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+
+        pp->imr &= ~MCFUART_UIR_RXREADY;
+        writeb(pp->imr, port->membase + MCFUART_UIMR);
+}
+
+/****************************************************************************/
+
+static void mcf_break_ctl(struct uart_port *port, int break_state)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        if (break_state == -1)
+                writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
+        else
+                writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/****************************************************************************/
+
+static void mcf_enable_ms(struct uart_port *port)
+{
+}
+
+/****************************************************************************/
+
+static int mcf_startup(struct uart_port *port)
+{
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Reset UART, get it into known state... */
+        writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
+        writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
+
+        /* Enable the UART transmitter and receiver */
+        writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
+                port->membase + MCFUART_UCR);
+
+        /* Enable RX interrupts now */
+        pp->imr = MCFUART_UIR_RXREADY;
+        writeb(pp->imr, port->membase + MCFUART_UIMR);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        return 0;
+}
+
+/****************************************************************************/
+
+static void mcf_shutdown(struct uart_port *port)
+{
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Disable all interrupts now */
+        pp->imr = 0;
+        writeb(pp->imr, port->membase + MCFUART_UIMR);
+
+        /* Disable UART transmitter and receiver */
+        writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
+        writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/****************************************************************************/
+
+static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
+        struct ktermios *old)
+{
+        unsigned long flags;
+        unsigned int baud, baudclk;
+#if defined(CONFIG_M5272)
+        unsigned int baudfr;
+#endif
+        unsigned char mr1, mr2;
+
+        baud = uart_get_baud_rate(port, termios, old, 0, 230400);
+#if defined(CONFIG_M5272)
+        baudclk = (MCF_BUSCLK / baud) / 32;
+        baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
+#else
+        baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
+#endif
+
+        mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
+        mr2 = 0;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5: mr1 |= MCFUART_MR1_CS5; break;
+        case CS6: mr1 |= MCFUART_MR1_CS6; break;
+        case CS7: mr1 |= MCFUART_MR1_CS7; break;
+        case CS8:
+        default:  mr1 |= MCFUART_MR1_CS8; break;
+        }
+
+        if (termios->c_cflag & PARENB) {
+                if (termios->c_cflag & CMSPAR) {
+                        if (termios->c_cflag & PARODD)
+                                mr1 |= MCFUART_MR1_PARITYMARK;
+                        else
+                                mr1 |= MCFUART_MR1_PARITYSPACE;
+                } else {
+                        if (termios->c_cflag & PARODD)
+                                mr1 |= MCFUART_MR1_PARITYODD;
+                        else
+                                mr1 |= MCFUART_MR1_PARITYEVEN;
+                }
+        } else {
+                mr1 |= MCFUART_MR1_PARITYNONE;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                mr2 |= MCFUART_MR2_STOP2;
+        else
+                mr2 |= MCFUART_MR2_STOP1;
+
+        if (termios->c_cflag & CRTSCTS) {
+                mr1 |= MCFUART_MR1_RXRTS;
+                mr2 |= MCFUART_MR2_TXCTS;
+        }
+
+        spin_lock_irqsave(&port->lock, flags);
+        uart_update_timeout(port, termios->c_cflag, baud);
+        writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
+        writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
+        writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
+        writeb(mr1, port->membase + MCFUART_UMR);
+        writeb(mr2, port->membase + MCFUART_UMR);
+        writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
+        writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
+#if defined(CONFIG_M5272)
+        writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
+#endif
+        writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
+                port->membase + MCFUART_UCSR);
+        writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
+                port->membase + MCFUART_UCR);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/****************************************************************************/
+
+static void mcf_rx_chars(struct mcf_uart *pp)
+{
+        struct uart_port *port = &pp->port;
+        unsigned char status, ch, flag;
+
+        while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
+                ch = readb(port->membase + MCFUART_URB);
+                flag = TTY_NORMAL;
+                port->icount.rx++;
+
+                if (status & MCFUART_USR_RXERR) {
+                        writeb(MCFUART_UCR_CMDRESETERR,
+                                port->membase + MCFUART_UCR);
+
+                        if (status & MCFUART_USR_RXBREAK) {
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        continue;
+                        } else if (status & MCFUART_USR_RXPARITY) {
+                                port->icount.parity++;
+                        } else if (status & MCFUART_USR_RXOVERRUN) {
+                                port->icount.overrun++;
+                        } else if (status & MCFUART_USR_RXFRAMING) {
+                                port->icount.frame++;
+                        }
+
+                        status &= port->read_status_mask;
+
+                        if (status & MCFUART_USR_RXBREAK)
+                                flag = TTY_BREAK;
+                        else if (status & MCFUART_USR_RXPARITY)
+                                flag = TTY_PARITY;
+                        else if (status & MCFUART_USR_RXFRAMING)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        continue;
+                uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
+        }
+
+        tty_flip_buffer_push(port->state->port.tty);
+}
+
+/****************************************************************************/
+
+static void mcf_tx_chars(struct mcf_uart *pp)
+{
+        struct uart_port *port = &pp->port;
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (port->x_char) {
+                /* Send special char - probably flow control */
+                writeb(port->x_char, port->membase + MCFUART_UTB);
+                port->x_char = 0;
+                port->icount.tx++;
+                return;
+        }
+
+        while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
+                if (xmit->head == xmit->tail)
+                        break;
+                writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
+                port->icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (xmit->head == xmit->tail) {
+                pp->imr &= ~MCFUART_UIR_TXREADY;
+                writeb(pp->imr, port->membase + MCFUART_UIMR);
+        }
+}
+
+/****************************************************************************/
+
+static irqreturn_t mcf_interrupt(int irq, void *data)
+{
+        struct uart_port *port = data;
+        struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
+        unsigned int isr;
+        irqreturn_t ret = IRQ_NONE;
+
+        isr = readb(port->membase + MCFUART_UISR) & pp->imr;
+
+        spin_lock(&port->lock);
+        if (isr & MCFUART_UIR_RXREADY) {
+                mcf_rx_chars(pp);
+                ret = IRQ_HANDLED;
+        }
+        if (isr & MCFUART_UIR_TXREADY) {
+                mcf_tx_chars(pp);
+                ret = IRQ_HANDLED;
+        }
+        spin_unlock(&port->lock);
+
+        return ret;
+}
+
+/****************************************************************************/
+
+static void mcf_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_MCF;
+        port->fifosize = MCFUART_TXFIFOSIZE;
+
+        /* Clear mask, so no surprise interrupts. */
+        writeb(0, port->membase + MCFUART_UIMR);
+
+        if (request_irq(port->irq, mcf_interrupt, IRQF_DISABLED, "UART", port))
+                printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
+                        "interrupt vector=%d\n", port->line, port->irq);
+}
+
+/****************************************************************************/
+
+static const char *mcf_type(struct uart_port *port)
+{
+        return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
+}
+
+/****************************************************************************/
+
+static int mcf_request_port(struct uart_port *port)
+{
+        /* UARTs always present */
+        return 0;
+}
+
+/****************************************************************************/
+
+static void mcf_release_port(struct uart_port *port)
+{
+        /* Nothing to release... */
+}
+
+/****************************************************************************/
+
+static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
+                return -EINVAL;
+        return 0;
+}
+
+/****************************************************************************/
+
+/*
+ *      Define the basic serial functions we support.
+ */
+static const struct uart_ops mcf_uart_ops = {
+        .tx_empty       = mcf_tx_empty,
+        .get_mctrl      = mcf_get_mctrl,
+        .set_mctrl      = mcf_set_mctrl,
+        .start_tx       = mcf_start_tx,
+        .stop_tx        = mcf_stop_tx,
+        .stop_rx        = mcf_stop_rx,
+        .enable_ms      = mcf_enable_ms,
+        .break_ctl      = mcf_break_ctl,
+        .startup        = mcf_startup,
+        .shutdown       = mcf_shutdown,
+        .set_termios    = mcf_set_termios,
+        .type           = mcf_type,
+        .request_port   = mcf_request_port,
+        .release_port   = mcf_release_port,
+        .config_port    = mcf_config_port,
+        .verify_port    = mcf_verify_port,
+};
+
+static struct mcf_uart mcf_ports[4];
+
+#define MCF_MAXPORTS    ARRAY_SIZE(mcf_ports)
+
+/****************************************************************************/
+#if defined(CONFIG_SERIAL_MCF_CONSOLE)
+/****************************************************************************/
+
+int __init early_mcf_setup(struct mcf_platform_uart *platp)
+{
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
+                port = &mcf_ports[i].port;
+
+                port->line = i;
+                port->type = PORT_MCF;
+                port->mapbase = platp[i].mapbase;
+                port->membase = (platp[i].membase) ? platp[i].membase :
+                        (unsigned char __iomem *) port->mapbase;
+                port->iotype = SERIAL_IO_MEM;
+                port->irq = platp[i].irq;
+                port->uartclk = MCF_BUSCLK;
+                port->flags = ASYNC_BOOT_AUTOCONF;
+                port->ops = &mcf_uart_ops;
+        }
+
+        return 0;
+}
+
+/****************************************************************************/
+
+static void mcf_console_putc(struct console *co, const char c)
+{
+        struct uart_port *port = &(mcf_ports + co->index)->port;
+        int i;
+
+        for (i = 0; (i < 0x10000); i++) {
+                if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
+                        break;
+        }
+        writeb(c, port->membase + MCFUART_UTB);
+        for (i = 0; (i < 0x10000); i++) {
+                if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
+                        break;
+        }
+}
+
+/****************************************************************************/
+
+static void mcf_console_write(struct console *co, const char *s, unsigned int count)
+{
+        for (; (count); count--, s++) {
+                mcf_console_putc(co, *s);
+                if (*s == '\n')
+                        mcf_console_putc(co, '\r');
+        }
+}
+
+/****************************************************************************/
+
+static int __init mcf_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = CONFIG_SERIAL_MCF_BAUDRATE;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
+                co->index = 0;
+        port = &mcf_ports[co->index].port;
+        if (port->membase == 0)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+/****************************************************************************/
+
+static struct uart_driver mcf_driver;
+
+static struct console mcf_console = {
+        .name           = "ttyS",
+        .write          = mcf_console_write,
+        .device         = uart_console_device,
+        .setup          = mcf_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &mcf_driver,
+};
+
+static int __init mcf_console_init(void)
+{
+        register_console(&mcf_console);
+        return 0;
+}
+
+console_initcall(mcf_console_init);
+
+#define MCF_CONSOLE     &mcf_console
+
+/****************************************************************************/
+#else
+/****************************************************************************/
+
+#define MCF_CONSOLE     NULL
+
+/****************************************************************************/
+#endif /* CONFIG_MCF_CONSOLE */
+/****************************************************************************/
+
+/*
+ *      Define the mcf UART driver structure.
+ */
+static struct uart_driver mcf_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "mcf",
+        .dev_name       = "ttyS",
+        .major          = TTY_MAJOR,
+        .minor          = 64,
+        .nr             = MCF_MAXPORTS,
+        .cons           = MCF_CONSOLE,
+};
+
+/****************************************************************************/
+
+static int __devinit mcf_probe(struct platform_device *pdev)
+{
+        struct mcf_platform_uart *platp = pdev->dev.platform_data;
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
+                port = &mcf_ports[i].port;
+
+                port->line = i;
+                port->type = PORT_MCF;
+                port->mapbase = platp[i].mapbase;
+                port->membase = (platp[i].membase) ? platp[i].membase :
+                        (unsigned char __iomem *) platp[i].mapbase;
+                port->iotype = SERIAL_IO_MEM;
+                port->irq = platp[i].irq;
+                port->uartclk = MCF_BUSCLK;
+                port->ops = &mcf_uart_ops;
+                port->flags = ASYNC_BOOT_AUTOCONF;
+
+                uart_add_one_port(&mcf_driver, port);
+        }
+
+        return 0;
+}
+
+/****************************************************************************/
+
+static int __devexit mcf_remove(struct platform_device *pdev)
+{
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; (i < MCF_MAXPORTS); i++) {
+                port = &mcf_ports[i].port;
+                if (port)
+                        uart_remove_one_port(&mcf_driver, port);
+        }
+
+        return 0;
+}
+
+/****************************************************************************/
+
+static struct platform_driver mcf_platform_driver = {
+        .probe          = mcf_probe,
+        .remove         = __devexit_p(mcf_remove),
+        .driver         = {
+                .name   = "mcfuart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+/****************************************************************************/
+
+static int __init mcf_init(void)
+{
+        int rc;
+
+        printk("ColdFire internal UART serial driver\n");
+
+        rc = uart_register_driver(&mcf_driver);
+        if (rc)
+                return rc;
+        rc = platform_driver_register(&mcf_platform_driver);
+        if (rc)
+                return rc;
+        return 0;
+}
+
+/****************************************************************************/
+
+static void __exit mcf_exit(void)
+{
+        platform_driver_unregister(&mcf_platform_driver);
+        uart_unregister_driver(&mcf_driver);
+}
+
+/****************************************************************************/
+
+module_init(mcf_init);
+module_exit(mcf_exit);
+
+MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
+MODULE_DESCRIPTION("Freescale ColdFire UART driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mcfuart");
+
+/****************************************************************************/
diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
new file mode 100644
index 000000000000..cab52f4a88b0
--- /dev/null
+++ b/drivers/tty/serial/mfd.c
@@ -0,0 +1,1470 @@
+/*
+ * mfd.c: driver for High Speed UART device of Intel Medfield platform
+ *
+ * Refer pxa.c, 8250.c and some other drivers in drivers/serial/
+ *
+ * (C) Copyright 2010 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+/* Notes:
+ * 1. DMA channel allocation: 0/1 channel are assigned to port 0,
+ *    2/3 chan to port 1, 4/5 chan to port 3. Even number chans
+ *    are used for RX, odd chans for TX
+ *
+ * 2. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always
+ *    asserted, only when the HW is reset the DDCD and DDSR will
+ *    be triggered
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/slab.h>
+#include <linux/serial_reg.h>
+#include <linux/circ_buf.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial_mfd.h>
+#include <linux/dma-mapping.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/debugfs.h>
+
+#define HSU_DMA_BUF_SIZE        2048
+
+#define chan_readl(chan, offset)        readl(chan->reg + offset)
+#define chan_writel(chan, offset, val)  writel(val, chan->reg + offset)
+
+#define mfd_readl(obj, offset)          readl(obj->reg + offset)
+#define mfd_writel(obj, offset, val)    writel(val, obj->reg + offset)
+
+static int hsu_dma_enable;
+module_param(hsu_dma_enable, int, 0);
+MODULE_PARM_DESC(hsu_dma_enable,
+                 "It is a bitmap to set working mode, if bit[x] is 1, then port[x] will work in DMA mode, otherwise in PIO mode.");
+
+struct hsu_dma_buffer {
+        u8              *buf;
+        dma_addr_t      dma_addr;
+        u32             dma_size;
+        u32             ofs;
+};
+
+struct hsu_dma_chan {
+        u32     id;
+        enum dma_data_direction dirt;
+        struct uart_hsu_port    *uport;
+        void __iomem            *reg;
+};
+
+struct uart_hsu_port {
+        struct uart_port        port;
+        unsigned char           ier;
+        unsigned char           lcr;
+        unsigned char           mcr;
+        unsigned int            lsr_break_flag;
+        char                    name[12];
+        int                     index;
+        struct device           *dev;
+
+        struct hsu_dma_chan     *txc;
+        struct hsu_dma_chan     *rxc;
+        struct hsu_dma_buffer   txbuf;
+        struct hsu_dma_buffer   rxbuf;
+        int                     use_dma;        /* flag for DMA/PIO */
+        int                     running;
+        int                     dma_tx_on;
+};
+
+/* Top level data structure of HSU */
+struct hsu_port {
+        void __iomem    *reg;
+        unsigned long   paddr;
+        unsigned long   iolen;
+        u32             irq;
+
+        struct uart_hsu_port    port[3];
+        struct hsu_dma_chan     chans[10];
+
+        struct dentry *debugfs;
+};
+
+static inline unsigned int serial_in(struct uart_hsu_port *up, int offset)
+{
+        unsigned int val;
+
+        if (offset > UART_MSR) {
+                offset <<= 2;
+                val = readl(up->port.membase + offset);
+        } else
+                val = (unsigned int)readb(up->port.membase + offset);
+
+        return val;
+}
+
+static inline void serial_out(struct uart_hsu_port *up, int offset, int value)
+{
+        if (offset > UART_MSR) {
+                offset <<= 2;
+                writel(value, up->port.membase + offset);
+        } else {
+                unsigned char val = value & 0xff;
+                writeb(val, up->port.membase + offset);
+        }
+}
+
+#ifdef CONFIG_DEBUG_FS
+
+#define HSU_REGS_BUFSIZE        1024
+
+static int hsu_show_regs_open(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t port_show_regs(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        struct uart_hsu_port *up = file->private_data;
+        char *buf;
+        u32 len = 0;
+        ssize_t ret;
+
+        buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
+        if (!buf)
+                return 0;
+
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "MFD HSU port[%d] regs:\n", up->index);
+
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "=================================\n");
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "IER: \t\t0x%08x\n", serial_in(up, UART_IER));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "IIR: \t\t0x%08x\n", serial_in(up, UART_IIR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "LCR: \t\t0x%08x\n", serial_in(up, UART_LCR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "MCR: \t\t0x%08x\n", serial_in(up, UART_MCR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "LSR: \t\t0x%08x\n", serial_in(up, UART_LSR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "MSR: \t\t0x%08x\n", serial_in(up, UART_MSR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "FOR: \t\t0x%08x\n", serial_in(up, UART_FOR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "PS: \t\t0x%08x\n", serial_in(up, UART_PS));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "MUL: \t\t0x%08x\n", serial_in(up, UART_MUL));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "DIV: \t\t0x%08x\n", serial_in(up, UART_DIV));
+
+        if (len > HSU_REGS_BUFSIZE)
+                len = HSU_REGS_BUFSIZE;
+
+        ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
+        kfree(buf);
+        return ret;
+}
+
+static ssize_t dma_show_regs(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        struct hsu_dma_chan *chan = file->private_data;
+        char *buf;
+        u32 len = 0;
+        ssize_t ret;
+
+        buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL);
+        if (!buf)
+                return 0;
+
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "MFD HSU DMA channel [%d] regs:\n", chan->id);
+
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "=================================\n");
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "CR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_CR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "DCR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_DCR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "BSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_BSR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "MOTSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_MOTSR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0SAR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0TSR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1SAR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1TSR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2SAR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2TSR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3SAR));
+        len += snprintf(buf + len, HSU_REGS_BUFSIZE - len,
+                        "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3TSR));
+
+        if (len > HSU_REGS_BUFSIZE)
+                len = HSU_REGS_BUFSIZE;
+
+        ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
+        kfree(buf);
+        return ret;
+}
+
+static const struct file_operations port_regs_ops = {
+        .owner          = THIS_MODULE,
+        .open           = hsu_show_regs_open,
+        .read           = port_show_regs,
+        .llseek         = default_llseek,
+};
+
+static const struct file_operations dma_regs_ops = {
+        .owner          = THIS_MODULE,
+        .open           = hsu_show_regs_open,
+        .read           = dma_show_regs,
+        .llseek         = default_llseek,
+};
+
+static int hsu_debugfs_init(struct hsu_port *hsu)
+{
+        int i;
+        char name[32];
+
+        hsu->debugfs = debugfs_create_dir("hsu", NULL);
+        if (!hsu->debugfs)
+                return -ENOMEM;
+
+        for (i = 0; i < 3; i++) {
+                snprintf(name, sizeof(name), "port_%d_regs", i);
+                debugfs_create_file(name, S_IFREG | S_IRUGO,
+                        hsu->debugfs, (void *)(&hsu->port[i]), &port_regs_ops);
+        }
+
+        for (i = 0; i < 6; i++) {
+                snprintf(name, sizeof(name), "dma_chan_%d_regs", i);
+                debugfs_create_file(name, S_IFREG | S_IRUGO,
+                        hsu->debugfs, (void *)&hsu->chans[i], &dma_regs_ops);
+        }
+
+        return 0;
+}
+
+static void hsu_debugfs_remove(struct hsu_port *hsu)
+{
+        if (hsu->debugfs)
+                debugfs_remove_recursive(hsu->debugfs);
+}
+
+#else
+static inline int hsu_debugfs_init(struct hsu_port *hsu)
+{
+        return 0;
+}
+
+static inline void hsu_debugfs_remove(struct hsu_port *hsu)
+{
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static void serial_hsu_enable_ms(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+
+        up->ier |= UART_IER_MSI;
+        serial_out(up, UART_IER, up->ier);
+}
+
+void hsu_dma_tx(struct uart_hsu_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        struct hsu_dma_buffer *dbuf = &up->txbuf;
+        int count;
+
+        /* test_and_set_bit may be better, but anyway it's in lock protected mode */
+        if (up->dma_tx_on)
+                return;
+
+        /* Update the circ buf info */
+        xmit->tail += dbuf->ofs;
+        xmit->tail &= UART_XMIT_SIZE - 1;
+
+        up->port.icount.tx += dbuf->ofs;
+        dbuf->ofs = 0;
+
+        /* Disable the channel */
+        chan_writel(up->txc, HSU_CH_CR, 0x0);
+
+        if (!uart_circ_empty(xmit) && !uart_tx_stopped(&up->port)) {
+                dma_sync_single_for_device(up->port.dev,
+                                           dbuf->dma_addr,
+                                           dbuf->dma_size,
+                                           DMA_TO_DEVICE);
+
+                count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+                dbuf->ofs = count;
+
+                /* Reprogram the channel */
+                chan_writel(up->txc, HSU_CH_D0SAR, dbuf->dma_addr + xmit->tail);
+                chan_writel(up->txc, HSU_CH_D0TSR, count);
+
+                /* Reenable the channel */
+                chan_writel(up->txc, HSU_CH_DCR, 0x1
+                                                 | (0x1 << 8)
+                                                 | (0x1 << 16)
+                                                 | (0x1 << 24));
+                up->dma_tx_on = 1;
+                chan_writel(up->txc, HSU_CH_CR, 0x1);
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+}
+
+/* The buffer is already cache coherent */
+void hsu_dma_start_rx_chan(struct hsu_dma_chan *rxc, struct hsu_dma_buffer *dbuf)
+{
+        dbuf->ofs = 0;
+
+        chan_writel(rxc, HSU_CH_BSR, 32);
+        chan_writel(rxc, HSU_CH_MOTSR, 4);
+
+        chan_writel(rxc, HSU_CH_D0SAR, dbuf->dma_addr);
+        chan_writel(rxc, HSU_CH_D0TSR, dbuf->dma_size);
+        chan_writel(rxc, HSU_CH_DCR, 0x1 | (0x1 << 8)
+                                         | (0x1 << 16)
+                                         | (0x1 << 24)  /* timeout bit, see HSU Errata 1 */
+                                         );
+        chan_writel(rxc, HSU_CH_CR, 0x3);
+}
+
+/* Protected by spin_lock_irqsave(port->lock) */
+static void serial_hsu_start_tx(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+
+        if (up->use_dma) {
+                hsu_dma_tx(up);
+        } else if (!(up->ier & UART_IER_THRI)) {
+                up->ier |= UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+static void serial_hsu_stop_tx(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        struct hsu_dma_chan *txc = up->txc;
+
+        if (up->use_dma)
+                chan_writel(txc, HSU_CH_CR, 0x0);
+        else if (up->ier & UART_IER_THRI) {
+                up->ier &= ~UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+/* This is always called in spinlock protected mode, so
+ * modify timeout timer is safe here */
+void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts)
+{
+        struct hsu_dma_buffer *dbuf = &up->rxbuf;
+        struct hsu_dma_chan *chan = up->rxc;
+        struct uart_port *port = &up->port;
+        struct tty_struct *tty = port->state->port.tty;
+        int count;
+
+        if (!tty)
+                return;
+
+        /*
+         * First need to know how many is already transferred,
+         * then check if its a timeout DMA irq, and return
+         * the trail bytes out, push them up and reenable the
+         * channel
+         */
+
+        /* Timeout IRQ, need wait some time, see Errata 2 */
+        if (int_sts & 0xf00)
+                udelay(2);
+
+        /* Stop the channel */
+        chan_writel(chan, HSU_CH_CR, 0x0);
+
+        count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr;
+        if (!count) {
+                /* Restart the channel before we leave */
+                chan_writel(chan, HSU_CH_CR, 0x3);
+                return;
+        }
+
+        dma_sync_single_for_cpu(port->dev, dbuf->dma_addr,
+                        dbuf->dma_size, DMA_FROM_DEVICE);
+
+        /*
+         * Head will only wrap around when we recycle
+         * the DMA buffer, and when that happens, we
+         * explicitly set tail to 0. So head will
+         * always be greater than tail.
+         */
+        tty_insert_flip_string(tty, dbuf->buf, count);
+        port->icount.rx += count;
+
+        dma_sync_single_for_device(up->port.dev, dbuf->dma_addr,
+                        dbuf->dma_size, DMA_FROM_DEVICE);
+
+        /* Reprogram the channel */
+        chan_writel(chan, HSU_CH_D0SAR, dbuf->dma_addr);
+        chan_writel(chan, HSU_CH_D0TSR, dbuf->dma_size);
+        chan_writel(chan, HSU_CH_DCR, 0x1
+                                         | (0x1 << 8)
+                                         | (0x1 << 16)
+                                         | (0x1 << 24)  /* timeout bit, see HSU Errata 1 */
+                                         );
+        tty_flip_buffer_push(tty);
+
+        chan_writel(chan, HSU_CH_CR, 0x3);
+
+}
+
+static void serial_hsu_stop_rx(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        struct hsu_dma_chan *chan = up->rxc;
+
+        if (up->use_dma)
+                chan_writel(chan, HSU_CH_CR, 0x2);
+        else {
+                up->ier &= ~UART_IER_RLSI;
+                up->port.read_status_mask &= ~UART_LSR_DR;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+static inline void receive_chars(struct uart_hsu_port *up, int *status)
+{
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned int ch, flag;
+        unsigned int max_count = 256;
+
+        if (!tty)
+                return;
+
+        do {
+                ch = serial_in(up, UART_RX);
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+                                       UART_LSR_FE | UART_LSR_OE))) {
+
+                        dev_warn(up->dev, "We really rush into ERR/BI case"
+                                "status = 0x%02x", *status);
+                        /* For statistics only */
+                        if (*status & UART_LSR_BI) {
+                                *status &= ~(UART_LSR_FE | UART_LSR_PE);
+                                up->port.icount.brk++;
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        goto ignore_char;
+                        } else if (*status & UART_LSR_PE)
+                                up->port.icount.parity++;
+                        else if (*status & UART_LSR_FE)
+                                up->port.icount.frame++;
+                        if (*status & UART_LSR_OE)
+                                up->port.icount.overrun++;
+
+                        /* Mask off conditions which should be ignored. */
+                        *status &= up->port.read_status_mask;
+
+#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
+                        if (up->port.cons &&
+                                up->port.cons->index == up->port.line) {
+                                /* Recover the break flag from console xmit */
+                                *status |= up->lsr_break_flag;
+                                up->lsr_break_flag = 0;
+                        }
+#endif
+                        if (*status & UART_LSR_BI) {
+                                flag = TTY_BREAK;
+                        } else if (*status & UART_LSR_PE)
+                                flag = TTY_PARITY;
+                        else if (*status & UART_LSR_FE)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
+        ignore_char:
+                *status = serial_in(up, UART_LSR);
+        } while ((*status & UART_LSR_DR) && max_count--);
+        tty_flip_buffer_push(tty);
+}
+
+static void transmit_chars(struct uart_hsu_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int count;
+
+        if (up->port.x_char) {
+                serial_out(up, UART_TX, up->port.x_char);
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+                serial_hsu_stop_tx(&up->port);
+                return;
+        }
+
+        /* The IRQ is for TX FIFO half-empty */
+        count = up->port.fifosize / 2;
+
+        do {
+                serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        if (uart_circ_empty(xmit))
+                serial_hsu_stop_tx(&up->port);
+}
+
+static inline void check_modem_status(struct uart_hsu_port *up)
+{
+        int status;
+
+        status = serial_in(up, UART_MSR);
+
+        if ((status & UART_MSR_ANY_DELTA) == 0)
+                return;
+
+        if (status & UART_MSR_TERI)
+                up->port.icount.rng++;
+        if (status & UART_MSR_DDSR)
+                up->port.icount.dsr++;
+        /* We may only get DDCD when HW init and reset */
+        if (status & UART_MSR_DDCD)
+                uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+        /* Will start/stop_tx accordingly */
+        if (status & UART_MSR_DCTS)
+                uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+
+        wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static irqreturn_t port_irq(int irq, void *dev_id)
+{
+        struct uart_hsu_port *up = dev_id;
+        unsigned int iir, lsr;
+        unsigned long flags;
+
+        if (unlikely(!up->running))
+                return IRQ_NONE;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (up->use_dma) {
+                lsr = serial_in(up, UART_LSR);
+                if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE |
+                                       UART_LSR_FE | UART_LSR_OE)))
+                        dev_warn(up->dev,
+                                "Got lsr irq while using DMA, lsr = 0x%2x\n",
+                                lsr);
+                check_modem_status(up);
+                spin_unlock_irqrestore(&up->port.lock, flags);
+                return IRQ_HANDLED;
+        }
+
+        iir = serial_in(up, UART_IIR);
+        if (iir & UART_IIR_NO_INT) {
+                spin_unlock_irqrestore(&up->port.lock, flags);
+                return IRQ_NONE;
+        }
+
+        lsr = serial_in(up, UART_LSR);
+        if (lsr & UART_LSR_DR)
+                receive_chars(up, &lsr);
+        check_modem_status(up);
+
+        /* lsr will be renewed during the receive_chars */
+        if (lsr & UART_LSR_THRE)
+                transmit_chars(up);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        return IRQ_HANDLED;
+}
+
+static inline void dma_chan_irq(struct hsu_dma_chan *chan)
+{
+        struct uart_hsu_port *up = chan->uport;
+        unsigned long flags;
+        u32 int_sts;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        if (!up->use_dma || !up->running)
+                goto exit;
+
+        /*
+         * No matter what situation, need read clear the IRQ status
+         * There is a bug, see Errata 5, HSD 2900918
+         */
+        int_sts = chan_readl(chan, HSU_CH_SR);
+
+        /* Rx channel */
+        if (chan->dirt == DMA_FROM_DEVICE)
+                hsu_dma_rx(up, int_sts);
+
+        /* Tx channel */
+        if (chan->dirt == DMA_TO_DEVICE) {
+                chan_writel(chan, HSU_CH_CR, 0x0);
+                up->dma_tx_on = 0;
+                hsu_dma_tx(up);
+        }
+
+exit:
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        return;
+}
+
+static irqreturn_t dma_irq(int irq, void *dev_id)
+{
+        struct hsu_port *hsu = dev_id;
+        u32 int_sts, i;
+
+        int_sts = mfd_readl(hsu, HSU_GBL_DMAISR);
+
+        /* Currently we only have 6 channels may be used */
+        for (i = 0; i < 6; i++) {
+                if (int_sts & 0x1)
+                        dma_chan_irq(&hsu->chans[i]);
+                int_sts >>= 1;
+        }
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int serial_hsu_tx_empty(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        unsigned long flags;
+        unsigned int ret;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return ret;
+}
+
+static unsigned int serial_hsu_get_mctrl(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        unsigned char status;
+        unsigned int ret;
+
+        status = serial_in(up, UART_MSR);
+
+        ret = 0;
+        if (status & UART_MSR_DCD)
+                ret |= TIOCM_CAR;
+        if (status & UART_MSR_RI)
+                ret |= TIOCM_RNG;
+        if (status & UART_MSR_DSR)
+                ret |= TIOCM_DSR;
+        if (status & UART_MSR_CTS)
+                ret |= TIOCM_CTS;
+        return ret;
+}
+
+static void serial_hsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        unsigned char mcr = 0;
+
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        mcr |= up->mcr;
+
+        serial_out(up, UART_MCR, mcr);
+}
+
+static void serial_hsu_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (break_state == -1)
+                up->lcr |= UART_LCR_SBC;
+        else
+                up->lcr &= ~UART_LCR_SBC;
+        serial_out(up, UART_LCR, up->lcr);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+/*
+ * What special to do:
+ * 1. chose the 64B fifo mode
+ * 2. start dma or pio depends on configuration
+ * 3. we only allocate dma memory when needed
+ */
+static int serial_hsu_startup(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        unsigned long flags;
+
+        /*
+         * Clear the FIFO buffers and disable them.
+         * (they will be reenabled in set_termios())
+         */
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+        serial_out(up, UART_FCR, 0);
+
+        /* Clear the interrupt registers. */
+        (void) serial_in(up, UART_LSR);
+        (void) serial_in(up, UART_RX);
+        (void) serial_in(up, UART_IIR);
+        (void) serial_in(up, UART_MSR);
+
+        /* Now, initialize the UART, default is 8n1 */
+        serial_out(up, UART_LCR, UART_LCR_WLEN8);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        up->port.mctrl |= TIOCM_OUT2;
+        serial_hsu_set_mctrl(&up->port, up->port.mctrl);
+
+        /*
+         * Finally, enable interrupts.  Note: Modem status interrupts
+         * are set via set_termios(), which will be occurring imminently
+         * anyway, so we don't enable them here.
+         */
+        if (!up->use_dma)
+                up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE;
+        else
+                up->ier = 0;
+        serial_out(up, UART_IER, up->ier);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /* DMA init */
+        if (up->use_dma) {
+                struct hsu_dma_buffer *dbuf;
+                struct circ_buf *xmit = &port->state->xmit;
+
+                up->dma_tx_on = 0;
+
+                /* First allocate the RX buffer */
+                dbuf = &up->rxbuf;
+                dbuf->buf = kzalloc(HSU_DMA_BUF_SIZE, GFP_KERNEL);
+                if (!dbuf->buf) {
+                        up->use_dma = 0;
+                        goto exit;
+                }
+                dbuf->dma_addr = dma_map_single(port->dev,
+                                                dbuf->buf,
+                                                HSU_DMA_BUF_SIZE,
+                                                DMA_FROM_DEVICE);
+                dbuf->dma_size = HSU_DMA_BUF_SIZE;
+
+                /* Start the RX channel right now */
+                hsu_dma_start_rx_chan(up->rxc, dbuf);
+
+                /* Next init the TX DMA */
+                dbuf = &up->txbuf;
+                dbuf->buf = xmit->buf;
+                dbuf->dma_addr = dma_map_single(port->dev,
+                                               dbuf->buf,
+                                               UART_XMIT_SIZE,
+                                               DMA_TO_DEVICE);
+                dbuf->dma_size = UART_XMIT_SIZE;
+
+                /* This should not be changed all around */
+                chan_writel(up->txc, HSU_CH_BSR, 32);
+                chan_writel(up->txc, HSU_CH_MOTSR, 4);
+                dbuf->ofs = 0;
+        }
+
+exit:
+         /* And clear the interrupt registers again for luck. */
+        (void) serial_in(up, UART_LSR);
+        (void) serial_in(up, UART_RX);
+        (void) serial_in(up, UART_IIR);
+        (void) serial_in(up, UART_MSR);
+
+        up->running = 1;
+        return 0;
+}
+
+static void serial_hsu_shutdown(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        unsigned long flags;
+
+        /* Disable interrupts from this port */
+        up->ier = 0;
+        serial_out(up, UART_IER, 0);
+        up->running = 0;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        up->port.mctrl &= ~TIOCM_OUT2;
+        serial_hsu_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /* Disable break condition and FIFOs */
+        serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                                  UART_FCR_CLEAR_RCVR |
+                                  UART_FCR_CLEAR_XMIT);
+        serial_out(up, UART_FCR, 0);
+}
+
+static void
+serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
+                       struct ktermios *old)
+{
+        struct uart_hsu_port *up =
+                        container_of(port, struct uart_hsu_port, port);
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned char cval, fcr = 0;
+        unsigned long flags;
+        unsigned int baud, quot;
+        u32 ps, mul;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                cval = UART_LCR_WLEN5;
+                break;
+        case CS6:
+                cval = UART_LCR_WLEN6;
+                break;
+        case CS7:
+                cval = UART_LCR_WLEN7;
+                break;
+        default:
+        case CS8:
+                cval = UART_LCR_WLEN8;
+                break;
+        }
+
+        /* CMSPAR isn't supported by this driver */
+        if (tty)
+                tty->termios->c_cflag &= ~CMSPAR;
+
+        if (termios->c_cflag & CSTOPB)
+                cval |= UART_LCR_STOP;
+        if (termios->c_cflag & PARENB)
+                cval |= UART_LCR_PARITY;
+        if (!(termios->c_cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+
+        /*
+         * The base clk is 50Mhz, and the baud rate come from:
+         *      baud = 50M * MUL / (DIV * PS * DLAB)
+         *
+         * For those basic low baud rate we can get the direct
+         * scalar from 2746800, like 115200 = 2746800/24. For those
+         * higher baud rate, we handle them case by case, mainly by
+         * adjusting the MUL/PS registers, and DIV register is kept
+         * as default value 0x3d09 to make things simple
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
+
+        quot = 1;
+        ps = 0x10;
+        mul = 0x3600;
+        switch (baud) {
+        case 3500000:
+                mul = 0x3345;
+                ps = 0xC;
+                break;
+        case 1843200:
+                mul = 0x2400;
+                break;
+        case 3000000:
+        case 2500000:
+        case 2000000:
+        case 1500000:
+        case 1000000:
+        case 500000:
+                /* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
+                mul = baud / 500000 * 0x9C4;
+                break;
+        default:
+                /* Use uart_get_divisor to get quot for other baud rates */
+                quot = 0;
+        }
+
+        if (!quot)
+                quot = uart_get_divisor(port, baud);
+
+        if ((up->port.uartclk / quot) < (2400 * 16))
+                fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B;
+        else if ((up->port.uartclk / quot) < (230400 * 16))
+                fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_16B;
+        else
+                fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_32B;
+
+        fcr |= UART_FCR_HSU_64B_FIFO;
+
+        /*
+         * Ok, we're now changing the port state.  Do it with
+         * interrupts disabled.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /* Update the per-port timeout */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+        if (termios->c_iflag & INPCK)
+                up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= UART_LSR_BI;
+
+        /* Characters to ignore */
+        up->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+        if (termios->c_iflag & IGNBRK) {
+                up->port.ignore_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        up->port.ignore_status_mask |= UART_LSR_OE;
+        }
+
+        /* Ignore all characters if CREAD is not set */
+        if ((termios->c_cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= UART_LSR_DR;
+
+        /*
+         * CTS flow control flag and modem status interrupts, disable
+         * MSI by default
+         */
+        up->ier &= ~UART_IER_MSI;
+        if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+                up->ier |= UART_IER_MSI;
+
+        serial_out(up, UART_IER, up->ier);
+
+        if (termios->c_cflag & CRTSCTS)
+                up->mcr |= UART_MCR_AFE | UART_MCR_RTS;
+        else
+                up->mcr &= ~UART_MCR_AFE;
+
+        serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
+        serial_out(up, UART_DLL, quot & 0xff);          /* LS of divisor */
+        serial_out(up, UART_DLM, quot >> 8);            /* MS of divisor */
+        serial_out(up, UART_LCR, cval);                 /* reset DLAB */
+        serial_out(up, UART_MUL, mul);                  /* set MUL */
+        serial_out(up, UART_PS, ps);                    /* set PS */
+        up->lcr = cval;                                 /* Save LCR */
+        serial_hsu_set_mctrl(&up->port, up->port.mctrl);
+        serial_out(up, UART_FCR, fcr);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+serial_hsu_pm(struct uart_port *port, unsigned int state,
+              unsigned int oldstate)
+{
+}
+
+static void serial_hsu_release_port(struct uart_port *port)
+{
+}
+
+static int serial_hsu_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void serial_hsu_config_port(struct uart_port *port, int flags)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        up->port.type = PORT_MFD;
+}
+
+static int
+serial_hsu_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        /* We don't want the core code to modify any port params */
+        return -EINVAL;
+}
+
+static const char *
+serial_hsu_type(struct uart_port *port)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+        return up->name;
+}
+
+/* Mainly for uart console use */
+static struct uart_hsu_port *serial_hsu_ports[3];
+static struct uart_driver serial_hsu_reg;
+
+#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+/* Wait for transmitter & holding register to empty */
+static inline void wait_for_xmitr(struct uart_hsu_port *up)
+{
+        unsigned int status, tmout = 1000;
+
+        /* Wait up to 1ms for the character to be sent. */
+        do {
+                status = serial_in(up, UART_LSR);
+
+                if (status & UART_LSR_BI)
+                        up->lsr_break_flag = UART_LSR_BI;
+
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while (!(status & BOTH_EMPTY));
+
+        /* Wait up to 1s for flow control if necessary */
+        if (up->port.flags & UPF_CONS_FLOW) {
+                tmout = 1000000;
+                while (--tmout &&
+                       ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
+                        udelay(1);
+        }
+}
+
+static void serial_hsu_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_hsu_port *up =
+                container_of(port, struct uart_hsu_port, port);
+
+        wait_for_xmitr(up);
+        serial_out(up, UART_TX, ch);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ *
+ *      The console_lock must be held when we get here.
+ */
+static void
+serial_hsu_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_hsu_port *up = serial_hsu_ports[co->index];
+        unsigned long flags;
+        unsigned int ier;
+        int locked = 1;
+
+        local_irq_save(flags);
+        if (up->port.sysrq)
+                locked = 0;
+        else if (oops_in_progress) {
+                locked = spin_trylock(&up->port.lock);
+        } else
+                spin_lock(&up->port.lock);
+
+        /* First save the IER then disable the interrupts */
+        ier = serial_in(up, UART_IER);
+        serial_out(up, UART_IER, 0);
+
+        uart_console_write(&up->port, s, count, serial_hsu_console_putchar);
+
+        /*
+         * Finally, wait for transmitter to become empty
+         * and restore the IER
+         */
+        wait_for_xmitr(up);
+        serial_out(up, UART_IER, ier);
+
+        if (locked)
+                spin_unlock(&up->port.lock);
+        local_irq_restore(flags);
+}
+
+static struct console serial_hsu_console;
+
+static int __init
+serial_hsu_console_setup(struct console *co, char *options)
+{
+        struct uart_hsu_port *up;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+
+        if (co->index == -1 || co->index >= serial_hsu_reg.nr)
+                co->index = 0;
+        up = serial_hsu_ports[co->index];
+        if (!up)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        ret = uart_set_options(&up->port, co, baud, parity, bits, flow);
+
+        return ret;
+}
+
+static struct console serial_hsu_console = {
+        .name           = "ttyMFD",
+        .write          = serial_hsu_console_write,
+        .device         = uart_console_device,
+        .setup          = serial_hsu_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = 2,
+        .data           = &serial_hsu_reg,
+};
+#endif
+
+struct uart_ops serial_hsu_pops = {
+        .tx_empty       = serial_hsu_tx_empty,
+        .set_mctrl      = serial_hsu_set_mctrl,
+        .get_mctrl      = serial_hsu_get_mctrl,
+        .stop_tx        = serial_hsu_stop_tx,
+        .start_tx       = serial_hsu_start_tx,
+        .stop_rx        = serial_hsu_stop_rx,
+        .enable_ms      = serial_hsu_enable_ms,
+        .break_ctl      = serial_hsu_break_ctl,
+        .startup        = serial_hsu_startup,
+        .shutdown       = serial_hsu_shutdown,
+        .set_termios    = serial_hsu_set_termios,
+        .pm             = serial_hsu_pm,
+        .type           = serial_hsu_type,
+        .release_port   = serial_hsu_release_port,
+        .request_port   = serial_hsu_request_port,
+        .config_port    = serial_hsu_config_port,
+        .verify_port    = serial_hsu_verify_port,
+};
+
+static struct uart_driver serial_hsu_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "MFD serial",
+        .dev_name       = "ttyMFD",
+        .major          = TTY_MAJOR,
+        .minor          = 128,
+        .nr             = 3,
+};
+
+#ifdef CONFIG_PM
+static int serial_hsu_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        void *priv = pci_get_drvdata(pdev);
+        struct uart_hsu_port *up;
+
+        /* Make sure this is not the internal dma controller */
+        if (priv && (pdev->device != 0x081E)) {
+                up = priv;
+                uart_suspend_port(&serial_hsu_reg, &up->port);
+        }
+
+        pci_save_state(pdev);
+        pci_set_power_state(pdev, pci_choose_state(pdev, state));
+        return 0;
+}
+
+static int serial_hsu_resume(struct pci_dev *pdev)
+{
+        void *priv = pci_get_drvdata(pdev);
+        struct uart_hsu_port *up;
+        int ret;
+
+        pci_set_power_state(pdev, PCI_D0);
+        pci_restore_state(pdev);
+
+        ret = pci_enable_device(pdev);
+        if (ret)
+                dev_warn(&pdev->dev,
+                        "HSU: can't re-enable device, try to continue\n");
+
+        if (priv && (pdev->device != 0x081E)) {
+                up = priv;
+                uart_resume_port(&serial_hsu_reg, &up->port);
+        }
+        return 0;
+}
+#else
+#define serial_hsu_suspend      NULL
+#define serial_hsu_resume       NULL
+#endif
+
+/* temp global pointer before we settle down on using one or four PCI dev */
+static struct hsu_port *phsu;
+
+static int serial_hsu_probe(struct pci_dev *pdev,
+                                const struct pci_device_id *ent)
+{
+        struct uart_hsu_port *uport;
+        int index, ret;
+
+        printk(KERN_INFO "HSU: found PCI Serial controller(ID: %04x:%04x)\n",
+                pdev->vendor, pdev->device);
+
+        switch (pdev->device) {
+        case 0x081B:
+                index = 0;
+                break;
+        case 0x081C:
+                index = 1;
+                break;
+        case 0x081D:
+                index = 2;
+                break;
+        case 0x081E:
+                /* internal DMA controller */
+                index = 3;
+                break;
+        default:
+                dev_err(&pdev->dev, "HSU: out of index!");
+                return -ENODEV;
+        }
+
+        ret = pci_enable_device(pdev);
+        if (ret)
+                return ret;
+
+        if (index == 3) {
+                /* DMA controller */
+                ret = request_irq(pdev->irq, dma_irq, 0, "hsu_dma", phsu);
+                if (ret) {
+                        dev_err(&pdev->dev, "can not get IRQ\n");
+                        goto err_disable;
+                }
+                pci_set_drvdata(pdev, phsu);
+        } else {
+                /* UART port 0~2 */
+                uport = &phsu->port[index];
+                uport->port.irq = pdev->irq;
+                uport->port.dev = &pdev->dev;
+                uport->dev = &pdev->dev;
+
+                ret = request_irq(pdev->irq, port_irq, 0, uport->name, uport);
+                if (ret) {
+                        dev_err(&pdev->dev, "can not get IRQ\n");
+                        goto err_disable;
+                }
+                uart_add_one_port(&serial_hsu_reg, &uport->port);
+
+#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE
+                if (index == 2) {
+                        register_console(&serial_hsu_console);
+                        uport->port.cons = &serial_hsu_console;
+                }
+#endif
+                pci_set_drvdata(pdev, uport);
+        }
+
+        return 0;
+
+err_disable:
+        pci_disable_device(pdev);
+        return ret;
+}
+
+static void hsu_global_init(void)
+{
+        struct hsu_port *hsu;
+        struct uart_hsu_port *uport;
+        struct hsu_dma_chan *dchan;
+        int i, ret;
+
+        hsu = kzalloc(sizeof(struct hsu_port), GFP_KERNEL);
+        if (!hsu)
+                return;
+
+        /* Get basic io resource and map it */
+        hsu->paddr = 0xffa28000;
+        hsu->iolen = 0x1000;
+
+        if (!(request_mem_region(hsu->paddr, hsu->iolen, "HSU global")))
+                pr_warning("HSU: error in request mem region\n");
+
+        hsu->reg = ioremap_nocache((unsigned long)hsu->paddr, hsu->iolen);
+        if (!hsu->reg) {
+                pr_err("HSU: error in ioremap\n");
+                ret = -ENOMEM;
+                goto err_free_region;
+        }
+
+        /* Initialise the 3 UART ports */
+        uport = hsu->port;
+        for (i = 0; i < 3; i++) {
+                uport->port.type = PORT_MFD;
+                uport->port.iotype = UPIO_MEM;
+                uport->port.mapbase = (resource_size_t)hsu->paddr
+                                        + HSU_PORT_REG_OFFSET
+                                        + i * HSU_PORT_REG_LENGTH;
+                uport->port.membase = hsu->reg + HSU_PORT_REG_OFFSET
+                                        + i * HSU_PORT_REG_LENGTH;
+
+                sprintf(uport->name, "hsu_port%d", i);
+                uport->port.fifosize = 64;
+                uport->port.ops = &serial_hsu_pops;
+                uport->port.line = i;
+                uport->port.flags = UPF_IOREMAP;
+                /* set the scalable maxim support rate to 2746800 bps */
+                uport->port.uartclk = 115200 * 24 * 16;
+
+                uport->running = 0;
+                uport->txc = &hsu->chans[i * 2];
+                uport->rxc = &hsu->chans[i * 2 + 1];
+
+                serial_hsu_ports[i] = uport;
+                uport->index = i;
+
+                if (hsu_dma_enable & (1<<i))
+                        uport->use_dma = 1;
+                else
+                        uport->use_dma = 0;
+
+                uport++;
+        }
+
+        /* Initialise 6 dma channels */
+        dchan = hsu->chans;
+        for (i = 0; i < 6; i++) {
+                dchan->id = i;
+                dchan->dirt = (i & 0x1) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+                dchan->uport = &hsu->port[i/2];
+                dchan->reg = hsu->reg + HSU_DMA_CHANS_REG_OFFSET +
+                                i * HSU_DMA_CHANS_REG_LENGTH;
+
+                dchan++;
+        }
+
+        phsu = hsu;
+        hsu_debugfs_init(hsu);
+        return;
+
+err_free_region:
+        release_mem_region(hsu->paddr, hsu->iolen);
+        kfree(hsu);
+        return;
+}
+
+static void serial_hsu_remove(struct pci_dev *pdev)
+{
+        void *priv = pci_get_drvdata(pdev);
+        struct uart_hsu_port *up;
+
+        if (!priv)
+                return;
+
+        /* For port 0/1/2, priv is the address of uart_hsu_port */
+        if (pdev->device != 0x081E) {
+                up = priv;
+                uart_remove_one_port(&serial_hsu_reg, &up->port);
+        }
+
+        pci_set_drvdata(pdev, NULL);
+        free_irq(pdev->irq, priv);
+        pci_disable_device(pdev);
+}
+
+/* First 3 are UART ports, and the 4th is the DMA */
+static const struct pci_device_id pci_ids[] __devinitdata = {
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081B) },
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081C) },
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081D) },
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081E) },
+        {},
+};
+
+static struct pci_driver hsu_pci_driver = {
+        .name =         "HSU serial",
+        .id_table =     pci_ids,
+        .probe =        serial_hsu_probe,
+        .remove =       __devexit_p(serial_hsu_remove),
+        .suspend =      serial_hsu_suspend,
+        .resume =       serial_hsu_resume,
+};
+
+static int __init hsu_pci_init(void)
+{
+        int ret;
+
+        hsu_global_init();
+
+        ret = uart_register_driver(&serial_hsu_reg);
+        if (ret)
+                return ret;
+
+        return pci_register_driver(&hsu_pci_driver);
+}
+
+static void __exit hsu_pci_exit(void)
+{
+        pci_unregister_driver(&hsu_pci_driver);
+        uart_unregister_driver(&serial_hsu_reg);
+
+        hsu_debugfs_remove(phsu);
+
+        kfree(phsu);
+}
+
+module_init(hsu_pci_init);
+module_exit(hsu_pci_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:medfield-hsu");
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
new file mode 100644
index 000000000000..a0bcd8a3758d
--- /dev/null
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -0,0 +1,1524 @@
+/*
+ * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
+ *
+ * FIXME According to the usermanual the status bits in the status register
+ * are only updated when the peripherals access the FIFO and not when the
+ * CPU access them. So since we use this bits to know when we stop writing
+ * and reading, they may not be updated in-time and a race condition may
+ * exists. But I haven't be able to prove this and I don't care. But if
+ * any problem arises, it might worth checking. The TX/RX FIFO Stats
+ * registers should be used in addition.
+ * Update: Actually, they seem updated ... At least the bits we use.
+ *
+ *
+ * Maintainer : Sylvain Munaut <tnt@246tNt.com>
+ *
+ * Some of the code has been inspired/copied from the 2.4 code written
+ * by Dale Farnsworth <dfarnsworth@mvista.com>.
+ *
+ * Copyright (C) 2008 Freescale Semiconductor Inc.
+ *                    John Rigby <jrigby@gmail.com>
+ * Added support for MPC5121
+ * Copyright (C) 2006 Secret Lab Technologies Ltd.
+ *                    Grant Likely <grant.likely@secretlab.ca>
+ * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
+ * Copyright (C) 2003 MontaVista, Software, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#undef DEBUG
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+
+#include <asm/mpc52xx.h>
+#include <asm/mpc52xx_psc.h>
+
+#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+
+/* We've been assigned a range on the "Low-density serial ports" major */
+#define SERIAL_PSC_MAJOR        204
+#define SERIAL_PSC_MINOR        148
+
+
+#define ISR_PASS_LIMIT 256      /* Max number of iteration in the interrupt */
+
+
+static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
+        /* Rem: - We use the read_status_mask as a shadow of
+         *        psc->mpc52xx_psc_imr
+         *      - It's important that is array is all zero on start as we
+         *        use it to know if it's initialized or not ! If it's not sure
+         *        it's cleared, then a memset(...,0,...) should be added to
+         *        the console_init
+         */
+
+/* lookup table for matching device nodes to index numbers */
+static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
+
+static void mpc52xx_uart_of_enumerate(void);
+
+
+#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
+
+
+/* Forward declaration of the interruption handling routine */
+static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);
+static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
+
+
+/* Simple macro to test if a port is console or not. This one is taken
+ * for serial_core.c and maybe should be moved to serial_core.h ? */
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+#define uart_console(port) \
+        ((port)->cons && (port)->cons->index == (port)->line)
+#else
+#define uart_console(port)      (0)
+#endif
+
+/* ======================================================================== */
+/* PSC fifo operations for isolating differences between 52xx and 512x      */
+/* ======================================================================== */
+
+struct psc_ops {
+        void            (*fifo_init)(struct uart_port *port);
+        int             (*raw_rx_rdy)(struct uart_port *port);
+        int             (*raw_tx_rdy)(struct uart_port *port);
+        int             (*rx_rdy)(struct uart_port *port);
+        int             (*tx_rdy)(struct uart_port *port);
+        int             (*tx_empty)(struct uart_port *port);
+        void            (*stop_rx)(struct uart_port *port);
+        void            (*start_tx)(struct uart_port *port);
+        void            (*stop_tx)(struct uart_port *port);
+        void            (*rx_clr_irq)(struct uart_port *port);
+        void            (*tx_clr_irq)(struct uart_port *port);
+        void            (*write_char)(struct uart_port *port, unsigned char c);
+        unsigned char   (*read_char)(struct uart_port *port);
+        void            (*cw_disable_ints)(struct uart_port *port);
+        void            (*cw_restore_ints)(struct uart_port *port);
+        unsigned int    (*set_baudrate)(struct uart_port *port,
+                                        struct ktermios *new,
+                                        struct ktermios *old);
+        int             (*clock)(struct uart_port *port, int enable);
+        int             (*fifoc_init)(void);
+        void            (*fifoc_uninit)(void);
+        void            (*get_irq)(struct uart_port *, struct device_node *);
+        irqreturn_t     (*handle_irq)(struct uart_port *port);
+};
+
+/* setting the prescaler and divisor reg is common for all chips */
+static inline void mpc52xx_set_divisor(struct mpc52xx_psc __iomem *psc,
+                                       u16 prescaler, unsigned int divisor)
+{
+        /* select prescaler */
+        out_be16(&psc->mpc52xx_psc_clock_select, prescaler);
+        out_8(&psc->ctur, divisor >> 8);
+        out_8(&psc->ctlr, divisor & 0xff);
+}
+
+#ifdef CONFIG_PPC_MPC52xx
+#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
+static void mpc52xx_psc_fifo_init(struct uart_port *port)
+{
+        struct mpc52xx_psc __iomem *psc = PSC(port);
+        struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);
+
+        out_8(&fifo->rfcntl, 0x00);
+        out_be16(&fifo->rfalarm, 0x1ff);
+        out_8(&fifo->tfcntl, 0x07);
+        out_be16(&fifo->tfalarm, 0x80);
+
+        port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
+        out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
+{
+        return in_be16(&PSC(port)->mpc52xx_psc_status)
+            & MPC52xx_PSC_SR_RXRDY;
+}
+
+static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
+{
+        return in_be16(&PSC(port)->mpc52xx_psc_status)
+            & MPC52xx_PSC_SR_TXRDY;
+}
+
+
+static int mpc52xx_psc_rx_rdy(struct uart_port *port)
+{
+        return in_be16(&PSC(port)->mpc52xx_psc_isr)
+            & port->read_status_mask
+            & MPC52xx_PSC_IMR_RXRDY;
+}
+
+static int mpc52xx_psc_tx_rdy(struct uart_port *port)
+{
+        return in_be16(&PSC(port)->mpc52xx_psc_isr)
+            & port->read_status_mask
+            & MPC52xx_PSC_IMR_TXRDY;
+}
+
+static int mpc52xx_psc_tx_empty(struct uart_port *port)
+{
+        return in_be16(&PSC(port)->mpc52xx_psc_status)
+            & MPC52xx_PSC_SR_TXEMP;
+}
+
+static void mpc52xx_psc_start_tx(struct uart_port *port)
+{
+        port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
+        out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc52xx_psc_stop_tx(struct uart_port *port)
+{
+        port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
+        out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc52xx_psc_stop_rx(struct uart_port *port)
+{
+        port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
+        out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
+{
+}
+
+static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
+{
+}
+
+static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
+{
+        out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
+}
+
+static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
+{
+        return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
+}
+
+static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
+{
+        out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
+}
+
+static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
+{
+        out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static unsigned int mpc5200_psc_set_baudrate(struct uart_port *port,
+                                             struct ktermios *new,
+                                             struct ktermios *old)
+{
+        unsigned int baud;
+        unsigned int divisor;
+
+        /* The 5200 has a fixed /32 prescaler, uartclk contains the ipb freq */
+        baud = uart_get_baud_rate(port, new, old,
+                                  port->uartclk / (32 * 0xffff) + 1,
+                                  port->uartclk / 32);
+        divisor = (port->uartclk + 16 * baud) / (32 * baud);
+
+        /* enable the /32 prescaler and set the divisor */
+        mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
+        return baud;
+}
+
+static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
+                                              struct ktermios *new,
+                                              struct ktermios *old)
+{
+        unsigned int baud;
+        unsigned int divisor;
+        u16 prescaler;
+
+        /* The 5200B has a selectable /4 or /32 prescaler, uartclk contains the
+         * ipb freq */
+        baud = uart_get_baud_rate(port, new, old,
+                                  port->uartclk / (32 * 0xffff) + 1,
+                                  port->uartclk / 4);
+        divisor = (port->uartclk + 2 * baud) / (4 * baud);
+
+        /* select the proper prescaler and set the divisor */
+        if (divisor > 0xffff) {
+                divisor = (divisor + 4) / 8;
+                prescaler = 0xdd00; /* /32 */
+        } else
+                prescaler = 0xff00; /* /4 */
+        mpc52xx_set_divisor(PSC(port), prescaler, divisor);
+        return baud;
+}
+
+static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
+{
+        port->irqflags = IRQF_DISABLED;
+        port->irq = irq_of_parse_and_map(np, 0);
+}
+
+/* 52xx specific interrupt handler. The caller holds the port lock */
+static irqreturn_t mpc52xx_psc_handle_irq(struct uart_port *port)
+{
+        return mpc5xxx_uart_process_int(port);
+}
+
+static struct psc_ops mpc52xx_psc_ops = {
+        .fifo_init = mpc52xx_psc_fifo_init,
+        .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
+        .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
+        .rx_rdy = mpc52xx_psc_rx_rdy,
+        .tx_rdy = mpc52xx_psc_tx_rdy,
+        .tx_empty = mpc52xx_psc_tx_empty,
+        .stop_rx = mpc52xx_psc_stop_rx,
+        .start_tx = mpc52xx_psc_start_tx,
+        .stop_tx = mpc52xx_psc_stop_tx,
+        .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
+        .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
+        .write_char = mpc52xx_psc_write_char,
+        .read_char = mpc52xx_psc_read_char,
+        .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
+        .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
+        .set_baudrate = mpc5200_psc_set_baudrate,
+        .get_irq = mpc52xx_psc_get_irq,
+        .handle_irq = mpc52xx_psc_handle_irq,
+};
+
+static struct psc_ops mpc5200b_psc_ops = {
+        .fifo_init = mpc52xx_psc_fifo_init,
+        .raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
+        .raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
+        .rx_rdy = mpc52xx_psc_rx_rdy,
+        .tx_rdy = mpc52xx_psc_tx_rdy,
+        .tx_empty = mpc52xx_psc_tx_empty,
+        .stop_rx = mpc52xx_psc_stop_rx,
+        .start_tx = mpc52xx_psc_start_tx,
+        .stop_tx = mpc52xx_psc_stop_tx,
+        .rx_clr_irq = mpc52xx_psc_rx_clr_irq,
+        .tx_clr_irq = mpc52xx_psc_tx_clr_irq,
+        .write_char = mpc52xx_psc_write_char,
+        .read_char = mpc52xx_psc_read_char,
+        .cw_disable_ints = mpc52xx_psc_cw_disable_ints,
+        .cw_restore_ints = mpc52xx_psc_cw_restore_ints,
+        .set_baudrate = mpc5200b_psc_set_baudrate,
+        .get_irq = mpc52xx_psc_get_irq,
+        .handle_irq = mpc52xx_psc_handle_irq,
+};
+
+#endif /* CONFIG_MPC52xx */
+
+#ifdef CONFIG_PPC_MPC512x
+#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
+
+/* PSC FIFO Controller for mpc512x */
+struct psc_fifoc {
+        u32 fifoc_cmd;
+        u32 fifoc_int;
+        u32 fifoc_dma;
+        u32 fifoc_axe;
+        u32 fifoc_debug;
+};
+
+static struct psc_fifoc __iomem *psc_fifoc;
+static unsigned int psc_fifoc_irq;
+
+static void mpc512x_psc_fifo_init(struct uart_port *port)
+{
+        /* /32 prescaler */
+        out_be16(&PSC(port)->mpc52xx_psc_clock_select, 0xdd00);
+
+        out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
+        out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
+        out_be32(&FIFO_512x(port)->txalarm, 1);
+        out_be32(&FIFO_512x(port)->tximr, 0);
+
+        out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
+        out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
+        out_be32(&FIFO_512x(port)->rxalarm, 1);
+        out_be32(&FIFO_512x(port)->rximr, 0);
+
+        out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
+        out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
+}
+
+static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
+{
+        return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
+}
+
+static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
+{
+        return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
+}
+
+static int mpc512x_psc_rx_rdy(struct uart_port *port)
+{
+        return in_be32(&FIFO_512x(port)->rxsr)
+            & in_be32(&FIFO_512x(port)->rximr)
+            & MPC512x_PSC_FIFO_ALARM;
+}
+
+static int mpc512x_psc_tx_rdy(struct uart_port *port)
+{
+        return in_be32(&FIFO_512x(port)->txsr)
+            & in_be32(&FIFO_512x(port)->tximr)
+            & MPC512x_PSC_FIFO_ALARM;
+}
+
+static int mpc512x_psc_tx_empty(struct uart_port *port)
+{
+        return in_be32(&FIFO_512x(port)->txsr)
+            & MPC512x_PSC_FIFO_EMPTY;
+}
+
+static void mpc512x_psc_stop_rx(struct uart_port *port)
+{
+        unsigned long rx_fifo_imr;
+
+        rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
+        rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
+        out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
+}
+
+static void mpc512x_psc_start_tx(struct uart_port *port)
+{
+        unsigned long tx_fifo_imr;
+
+        tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
+        tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
+        out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
+}
+
+static void mpc512x_psc_stop_tx(struct uart_port *port)
+{
+        unsigned long tx_fifo_imr;
+
+        tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
+        tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
+        out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
+}
+
+static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
+{
+        out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
+}
+
+static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
+{
+        out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
+}
+
+static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
+{
+        out_8(&FIFO_512x(port)->txdata_8, c);
+}
+
+static unsigned char mpc512x_psc_read_char(struct uart_port *port)
+{
+        return in_8(&FIFO_512x(port)->rxdata_8);
+}
+
+static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
+{
+        port->read_status_mask =
+                in_be32(&FIFO_512x(port)->tximr) << 16 |
+                in_be32(&FIFO_512x(port)->rximr);
+        out_be32(&FIFO_512x(port)->tximr, 0);
+        out_be32(&FIFO_512x(port)->rximr, 0);
+}
+
+static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
+{
+        out_be32(&FIFO_512x(port)->tximr,
+                (port->read_status_mask >> 16) & 0x7f);
+        out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
+}
+
+static unsigned int mpc512x_psc_set_baudrate(struct uart_port *port,
+                                             struct ktermios *new,
+                                             struct ktermios *old)
+{
+        unsigned int baud;
+        unsigned int divisor;
+
+        /*
+         * The "MPC5121e Microcontroller Reference Manual, Rev. 3" says on
+         * pg. 30-10 that the chip supports a /32 and a /10 prescaler.
+         * Furthermore, it states that "After reset, the prescaler by 10
+         * for the UART mode is selected", but the reset register value is
+         * 0x0000 which means a /32 prescaler. This is wrong.
+         *
+         * In reality using /32 prescaler doesn't work, as it is not supported!
+         * Use /16 or /10 prescaler, see "MPC5121e Hardware Design Guide",
+         * Chapter 4.1 PSC in UART Mode.
+         * Calculate with a /16 prescaler here.
+         */
+
+        /* uartclk contains the ips freq */
+        baud = uart_get_baud_rate(port, new, old,
+                                  port->uartclk / (16 * 0xffff) + 1,
+                                  port->uartclk / 16);
+        divisor = (port->uartclk + 8 * baud) / (16 * baud);
+
+        /* enable the /16 prescaler and set the divisor */
+        mpc52xx_set_divisor(PSC(port), 0xdd00, divisor);
+        return baud;
+}
+
+/* Init PSC FIFO Controller */
+static int __init mpc512x_psc_fifoc_init(void)
+{
+        struct device_node *np;
+
+        np = of_find_compatible_node(NULL, NULL,
+                                     "fsl,mpc5121-psc-fifo");
+        if (!np) {
+                pr_err("%s: Can't find FIFOC node\n", __func__);
+                return -ENODEV;
+        }
+
+        psc_fifoc = of_iomap(np, 0);
+        if (!psc_fifoc) {
+                pr_err("%s: Can't map FIFOC\n", __func__);
+                of_node_put(np);
+                return -ENODEV;
+        }
+
+        psc_fifoc_irq = irq_of_parse_and_map(np, 0);
+        of_node_put(np);
+        if (psc_fifoc_irq == NO_IRQ) {
+                pr_err("%s: Can't get FIFOC irq\n", __func__);
+                iounmap(psc_fifoc);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void __exit mpc512x_psc_fifoc_uninit(void)
+{
+        iounmap(psc_fifoc);
+}
+
+/* 512x specific interrupt handler. The caller holds the port lock */
+static irqreturn_t mpc512x_psc_handle_irq(struct uart_port *port)
+{
+        unsigned long fifoc_int;
+        int psc_num;
+
+        /* Read pending PSC FIFOC interrupts */
+        fifoc_int = in_be32(&psc_fifoc->fifoc_int);
+
+        /* Check if it is an interrupt for this port */
+        psc_num = (port->mapbase & 0xf00) >> 8;
+        if (test_bit(psc_num, &fifoc_int) ||
+            test_bit(psc_num + 16, &fifoc_int))
+                return mpc5xxx_uart_process_int(port);
+
+        return IRQ_NONE;
+}
+
+static int mpc512x_psc_clock(struct uart_port *port, int enable)
+{
+        struct clk *psc_clk;
+        int psc_num;
+        char clk_name[10];
+
+        if (uart_console(port))
+                return 0;
+
+        psc_num = (port->mapbase & 0xf00) >> 8;
+        snprintf(clk_name, sizeof(clk_name), "psc%d_clk", psc_num);
+        psc_clk = clk_get(port->dev, clk_name);
+        if (IS_ERR(psc_clk)) {
+                dev_err(port->dev, "Failed to get PSC clock entry!\n");
+                return -ENODEV;
+        }
+
+        dev_dbg(port->dev, "%s %sable\n", clk_name, enable ? "en" : "dis");
+
+        if (enable)
+                clk_enable(psc_clk);
+        else
+                clk_disable(psc_clk);
+
+        return 0;
+}
+
+static void mpc512x_psc_get_irq(struct uart_port *port, struct device_node *np)
+{
+        port->irqflags = IRQF_SHARED;
+        port->irq = psc_fifoc_irq;
+}
+
+static struct psc_ops mpc512x_psc_ops = {
+        .fifo_init = mpc512x_psc_fifo_init,
+        .raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
+        .raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
+        .rx_rdy = mpc512x_psc_rx_rdy,
+        .tx_rdy = mpc512x_psc_tx_rdy,
+        .tx_empty = mpc512x_psc_tx_empty,
+        .stop_rx = mpc512x_psc_stop_rx,
+        .start_tx = mpc512x_psc_start_tx,
+        .stop_tx = mpc512x_psc_stop_tx,
+        .rx_clr_irq = mpc512x_psc_rx_clr_irq,
+        .tx_clr_irq = mpc512x_psc_tx_clr_irq,
+        .write_char = mpc512x_psc_write_char,
+        .read_char = mpc512x_psc_read_char,
+        .cw_disable_ints = mpc512x_psc_cw_disable_ints,
+        .cw_restore_ints = mpc512x_psc_cw_restore_ints,
+        .set_baudrate = mpc512x_psc_set_baudrate,
+        .clock = mpc512x_psc_clock,
+        .fifoc_init = mpc512x_psc_fifoc_init,
+        .fifoc_uninit = mpc512x_psc_fifoc_uninit,
+        .get_irq = mpc512x_psc_get_irq,
+        .handle_irq = mpc512x_psc_handle_irq,
+};
+#endif
+
+static struct psc_ops *psc_ops;
+
+/* ======================================================================== */
+/* UART operations                                                          */
+/* ======================================================================== */
+
+static unsigned int
+mpc52xx_uart_tx_empty(struct uart_port *port)
+{
+        return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
+}
+
+static void
+mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        if (mctrl & TIOCM_RTS)
+                out_8(&PSC(port)->op1, MPC52xx_PSC_OP_RTS);
+        else
+                out_8(&PSC(port)->op0, MPC52xx_PSC_OP_RTS);
+}
+
+static unsigned int
+mpc52xx_uart_get_mctrl(struct uart_port *port)
+{
+        unsigned int ret = TIOCM_DSR;
+        u8 status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
+
+        if (!(status & MPC52xx_PSC_CTS))
+                ret |= TIOCM_CTS;
+        if (!(status & MPC52xx_PSC_DCD))
+                ret |= TIOCM_CAR;
+
+        return ret;
+}
+
+static void
+mpc52xx_uart_stop_tx(struct uart_port *port)
+{
+        /* port->lock taken by caller */
+        psc_ops->stop_tx(port);
+}
+
+static void
+mpc52xx_uart_start_tx(struct uart_port *port)
+{
+        /* port->lock taken by caller */
+        psc_ops->start_tx(port);
+}
+
+static void
+mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&port->lock, flags);
+
+        port->x_char = ch;
+        if (ch) {
+                /* Make sure tx interrupts are on */
+                /* Truly necessary ??? They should be anyway */
+                psc_ops->start_tx(port);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void
+mpc52xx_uart_stop_rx(struct uart_port *port)
+{
+        /* port->lock taken by caller */
+        psc_ops->stop_rx(port);
+}
+
+static void
+mpc52xx_uart_enable_ms(struct uart_port *port)
+{
+        struct mpc52xx_psc __iomem *psc = PSC(port);
+
+        /* clear D_*-bits by reading them */
+        in_8(&psc->mpc52xx_psc_ipcr);
+        /* enable CTS and DCD as IPC interrupts */
+        out_8(&psc->mpc52xx_psc_acr, MPC52xx_PSC_IEC_CTS | MPC52xx_PSC_IEC_DCD);
+
+        port->read_status_mask |= MPC52xx_PSC_IMR_IPC;
+        out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
+}
+
+static void
+mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&port->lock, flags);
+
+        if (ctl == -1)
+                out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
+        else
+                out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int
+mpc52xx_uart_startup(struct uart_port *port)
+{
+        struct mpc52xx_psc __iomem *psc = PSC(port);
+        int ret;
+
+        if (psc_ops->clock) {
+                ret = psc_ops->clock(port, 1);
+                if (ret)
+                        return ret;
+        }
+
+        /* Request IRQ */
+        ret = request_irq(port->irq, mpc52xx_uart_int,
+                          port->irqflags, "mpc52xx_psc_uart", port);
+        if (ret)
+                return ret;
+
+        /* Reset/activate the port, clear and enable interrupts */
+        out_8(&psc->command, MPC52xx_PSC_RST_RX);
+        out_8(&psc->command, MPC52xx_PSC_RST_TX);
+
+        out_be32(&psc->sicr, 0);        /* UART mode DCD ignored */
+
+        psc_ops->fifo_init(port);
+
+        out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
+        out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
+
+        return 0;
+}
+
+static void
+mpc52xx_uart_shutdown(struct uart_port *port)
+{
+        struct mpc52xx_psc __iomem *psc = PSC(port);
+
+        /* Shut down the port.  Leave TX active if on a console port */
+        out_8(&psc->command, MPC52xx_PSC_RST_RX);
+        if (!uart_console(port))
+                out_8(&psc->command, MPC52xx_PSC_RST_TX);
+
+        port->read_status_mask = 0;
+        out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
+
+        if (psc_ops->clock)
+                psc_ops->clock(port, 0);
+
+        /* Release interrupt */
+        free_irq(port->irq, port);
+}
+
+static void
+mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
+                         struct ktermios *old)
+{
+        struct mpc52xx_psc __iomem *psc = PSC(port);
+        unsigned long flags;
+        unsigned char mr1, mr2;
+        unsigned int j;
+        unsigned int baud;
+
+        /* Prepare what we're gonna write */
+        mr1 = 0;
+
+        switch (new->c_cflag & CSIZE) {
+        case CS5:       mr1 |= MPC52xx_PSC_MODE_5_BITS;
+                break;
+        case CS6:       mr1 |= MPC52xx_PSC_MODE_6_BITS;
+                break;
+        case CS7:       mr1 |= MPC52xx_PSC_MODE_7_BITS;
+                break;
+        case CS8:
+        default:        mr1 |= MPC52xx_PSC_MODE_8_BITS;
+        }
+
+        if (new->c_cflag & PARENB) {
+                mr1 |= (new->c_cflag & PARODD) ?
+                        MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
+        } else
+                mr1 |= MPC52xx_PSC_MODE_PARNONE;
+
+
+        mr2 = 0;
+
+        if (new->c_cflag & CSTOPB)
+                mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
+        else
+                mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
+                        MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
+                        MPC52xx_PSC_MODE_ONE_STOP;
+
+        if (new->c_cflag & CRTSCTS) {
+                mr1 |= MPC52xx_PSC_MODE_RXRTS;
+                mr2 |= MPC52xx_PSC_MODE_TXCTS;
+        }
+
+        /* Get the lock */
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Do our best to flush TX & RX, so we don't lose anything */
+        /* But we don't wait indefinitely ! */
+        j = 5000000;    /* Maximum wait */
+        /* FIXME Can't receive chars since set_termios might be called at early
+         * boot for the console, all stuff is not yet ready to receive at that
+         * time and that just makes the kernel oops */
+        /* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
+        while (!mpc52xx_uart_tx_empty(port) && --j)
+                udelay(1);
+
+        if (!j)
+                printk(KERN_ERR "mpc52xx_uart.c: "
+                        "Unable to flush RX & TX fifos in-time in set_termios."
+                        "Some chars may have been lost.\n");
+
+        /* Reset the TX & RX */
+        out_8(&psc->command, MPC52xx_PSC_RST_RX);
+        out_8(&psc->command, MPC52xx_PSC_RST_TX);
+
+        /* Send new mode settings */
+        out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
+        out_8(&psc->mode, mr1);
+        out_8(&psc->mode, mr2);
+        baud = psc_ops->set_baudrate(port, new, old);
+
+        /* Update the per-port timeout */
+        uart_update_timeout(port, new->c_cflag, baud);
+
+        if (UART_ENABLE_MS(port, new->c_cflag))
+                mpc52xx_uart_enable_ms(port);
+
+        /* Reenable TX & RX */
+        out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
+        out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);
+
+        /* We're all set, release the lock */
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *
+mpc52xx_uart_type(struct uart_port *port)
+{
+        /*
+         * We keep using PORT_MPC52xx for historic reasons although it applies
+         * for MPC512x, too, but print "MPC5xxx" to not irritate users
+         */
+        return port->type == PORT_MPC52xx ? "MPC5xxx PSC" : NULL;
+}
+
+static void
+mpc52xx_uart_release_port(struct uart_port *port)
+{
+        /* remapped by us ? */
+        if (port->flags & UPF_IOREMAP) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+
+        release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
+}
+
+static int
+mpc52xx_uart_request_port(struct uart_port *port)
+{
+        int err;
+
+        if (port->flags & UPF_IOREMAP) /* Need to remap ? */
+                port->membase = ioremap(port->mapbase,
+                                        sizeof(struct mpc52xx_psc));
+
+        if (!port->membase)
+                return -EINVAL;
+
+        err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
+                        "mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
+
+        if (err && (port->flags & UPF_IOREMAP)) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+
+        return err;
+}
+
+static void
+mpc52xx_uart_config_port(struct uart_port *port, int flags)
+{
+        if ((flags & UART_CONFIG_TYPE)
+                && (mpc52xx_uart_request_port(port) == 0))
+                port->type = PORT_MPC52xx;
+}
+
+static int
+mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
+                return -EINVAL;
+
+        if ((ser->irq != port->irq) ||
+            (ser->io_type != UPIO_MEM) ||
+            (ser->baud_base != port->uartclk)  ||
+            (ser->iomem_base != (void *)port->mapbase) ||
+            (ser->hub6 != 0))
+                return -EINVAL;
+
+        return 0;
+}
+
+
+static struct uart_ops mpc52xx_uart_ops = {
+        .tx_empty       = mpc52xx_uart_tx_empty,
+        .set_mctrl      = mpc52xx_uart_set_mctrl,
+        .get_mctrl      = mpc52xx_uart_get_mctrl,
+        .stop_tx        = mpc52xx_uart_stop_tx,
+        .start_tx       = mpc52xx_uart_start_tx,
+        .send_xchar     = mpc52xx_uart_send_xchar,
+        .stop_rx        = mpc52xx_uart_stop_rx,
+        .enable_ms      = mpc52xx_uart_enable_ms,
+        .break_ctl      = mpc52xx_uart_break_ctl,
+        .startup        = mpc52xx_uart_startup,
+        .shutdown       = mpc52xx_uart_shutdown,
+        .set_termios    = mpc52xx_uart_set_termios,
+/*      .pm             = mpc52xx_uart_pm,              Not supported yet */
+/*      .set_wake       = mpc52xx_uart_set_wake,        Not supported yet */
+        .type           = mpc52xx_uart_type,
+        .release_port   = mpc52xx_uart_release_port,
+        .request_port   = mpc52xx_uart_request_port,
+        .config_port    = mpc52xx_uart_config_port,
+        .verify_port    = mpc52xx_uart_verify_port
+};
+
+
+/* ======================================================================== */
+/* Interrupt handling                                                       */
+/* ======================================================================== */
+
+static inline int
+mpc52xx_uart_int_rx_chars(struct uart_port *port)
+{
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned char ch, flag;
+        unsigned short status;
+
+        /* While we can read, do so ! */
+        while (psc_ops->raw_rx_rdy(port)) {
+                /* Get the char */
+                ch = psc_ops->read_char(port);
+
+                /* Handle sysreq char */
+#ifdef SUPPORT_SYSRQ
+                if (uart_handle_sysrq_char(port, ch)) {
+                        port->sysrq = 0;
+                        continue;
+                }
+#endif
+
+                /* Store it */
+
+                flag = TTY_NORMAL;
+                port->icount.rx++;
+
+                status = in_be16(&PSC(port)->mpc52xx_psc_status);
+
+                if (status & (MPC52xx_PSC_SR_PE |
+                              MPC52xx_PSC_SR_FE |
+                              MPC52xx_PSC_SR_RB)) {
+
+                        if (status & MPC52xx_PSC_SR_RB) {
+                                flag = TTY_BREAK;
+                                uart_handle_break(port);
+                                port->icount.brk++;
+                        } else if (status & MPC52xx_PSC_SR_PE) {
+                                flag = TTY_PARITY;
+                                port->icount.parity++;
+                        }
+                        else if (status & MPC52xx_PSC_SR_FE) {
+                                flag = TTY_FRAME;
+                                port->icount.frame++;
+                        }
+
+                        /* Clear error condition */
+                        out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);
+
+                }
+                tty_insert_flip_char(tty, ch, flag);
+                if (status & MPC52xx_PSC_SR_OE) {
+                        /*
+                         * Overrun is special, since it's
+                         * reported immediately, and doesn't
+                         * affect the current character
+                         */
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                        port->icount.overrun++;
+                }
+        }
+
+        spin_unlock(&port->lock);
+        tty_flip_buffer_push(tty);
+        spin_lock(&port->lock);
+
+        return psc_ops->raw_rx_rdy(port);
+}
+
+static inline int
+mpc52xx_uart_int_tx_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+
+        /* Process out of band chars */
+        if (port->x_char) {
+                psc_ops->write_char(port, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+                return 1;
+        }
+
+        /* Nothing to do ? */
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                mpc52xx_uart_stop_tx(port);
+                return 0;
+        }
+
+        /* Send chars */
+        while (psc_ops->raw_tx_rdy(port)) {
+                psc_ops->write_char(port, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        /* Wake up */
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        /* Maybe we're done after all */
+        if (uart_circ_empty(xmit)) {
+                mpc52xx_uart_stop_tx(port);
+                return 0;
+        }
+
+        return 1;
+}
+
+static irqreturn_t
+mpc5xxx_uart_process_int(struct uart_port *port)
+{
+        unsigned long pass = ISR_PASS_LIMIT;
+        unsigned int keepgoing;
+        u8 status;
+
+        /* While we have stuff to do, we continue */
+        do {
+                /* If we don't find anything to do, we stop */
+                keepgoing = 0;
+
+                psc_ops->rx_clr_irq(port);
+                if (psc_ops->rx_rdy(port))
+                        keepgoing |= mpc52xx_uart_int_rx_chars(port);
+
+                psc_ops->tx_clr_irq(port);
+                if (psc_ops->tx_rdy(port))
+                        keepgoing |= mpc52xx_uart_int_tx_chars(port);
+
+                status = in_8(&PSC(port)->mpc52xx_psc_ipcr);
+                if (status & MPC52xx_PSC_D_DCD)
+                        uart_handle_dcd_change(port, !(status & MPC52xx_PSC_DCD));
+
+                if (status & MPC52xx_PSC_D_CTS)
+                        uart_handle_cts_change(port, !(status & MPC52xx_PSC_CTS));
+
+                /* Limit number of iteration */
+                if (!(--pass))
+                        keepgoing = 0;
+
+        } while (keepgoing);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t
+mpc52xx_uart_int(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        irqreturn_t ret;
+
+        spin_lock(&port->lock);
+
+        ret = psc_ops->handle_irq(port);
+
+        spin_unlock(&port->lock);
+
+        return ret;
+}
+
+/* ======================================================================== */
+/* Console ( if applicable )                                                */
+/* ======================================================================== */
+
+#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE
+
+static void __init
+mpc52xx_console_get_options(struct uart_port *port,
+                            int *baud, int *parity, int *bits, int *flow)
+{
+        struct mpc52xx_psc __iomem *psc = PSC(port);
+        unsigned char mr1;
+
+        pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
+
+        /* Read the mode registers */
+        out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
+        mr1 = in_8(&psc->mode);
+
+        /* CT{U,L}R are write-only ! */
+        *baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
+
+        /* Parse them */
+        switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
+        case MPC52xx_PSC_MODE_5_BITS:
+                *bits = 5;
+                break;
+        case MPC52xx_PSC_MODE_6_BITS:
+                *bits = 6;
+                break;
+        case MPC52xx_PSC_MODE_7_BITS:
+                *bits = 7;
+                break;
+        case MPC52xx_PSC_MODE_8_BITS:
+        default:
+                *bits = 8;
+        }
+
+        if (mr1 & MPC52xx_PSC_MODE_PARNONE)
+                *parity = 'n';
+        else
+                *parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
+}
+
+static void
+mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_port *port = &mpc52xx_uart_ports[co->index];
+        unsigned int i, j;
+
+        /* Disable interrupts */
+        psc_ops->cw_disable_ints(port);
+
+        /* Wait the TX buffer to be empty */
+        j = 5000000;    /* Maximum wait */
+        while (!mpc52xx_uart_tx_empty(port) && --j)
+                udelay(1);
+
+        /* Write all the chars */
+        for (i = 0; i < count; i++, s++) {
+                /* Line return handling */
+                if (*s == '\n')
+                        psc_ops->write_char(port, '\r');
+
+                /* Send the char */
+                psc_ops->write_char(port, *s);
+
+                /* Wait the TX buffer to be empty */
+                j = 20000;      /* Maximum wait */
+                while (!mpc52xx_uart_tx_empty(port) && --j)
+                        udelay(1);
+        }
+
+        /* Restore interrupt state */
+        psc_ops->cw_restore_ints(port);
+}
+
+
+static int __init
+mpc52xx_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port = &mpc52xx_uart_ports[co->index];
+        struct device_node *np = mpc52xx_uart_nodes[co->index];
+        unsigned int uartclk;
+        struct resource res;
+        int ret;
+
+        int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
+                 co, co->index, options);
+
+        if ((co->index < 0) || (co->index >= MPC52xx_PSC_MAXNUM)) {
+                pr_debug("PSC%x out of range\n", co->index);
+                return -EINVAL;
+        }
+
+        if (!np) {
+                pr_debug("PSC%x not found in device tree\n", co->index);
+                return -EINVAL;
+        }
+
+        pr_debug("Console on ttyPSC%x is %s\n",
+                 co->index, mpc52xx_uart_nodes[co->index]->full_name);
+
+        /* Fetch register locations */
+        ret = of_address_to_resource(np, 0, &res);
+        if (ret) {
+                pr_debug("Could not get resources for PSC%x\n", co->index);
+                return ret;
+        }
+
+        uartclk = mpc5xxx_get_bus_frequency(np);
+        if (uartclk == 0) {
+                pr_debug("Could not find uart clock frequency!\n");
+                return -EINVAL;
+        }
+
+        /* Basic port init. Needed since we use some uart_??? func before
+         * real init for early access */
+        spin_lock_init(&port->lock);
+        port->uartclk = uartclk;
+        port->ops       = &mpc52xx_uart_ops;
+        port->mapbase = res.start;
+        port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
+        port->irq = irq_of_parse_and_map(np, 0);
+
+        if (port->membase == NULL)
+                return -EINVAL;
+
+        pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
+                 (void *)port->mapbase, port->membase,
+                 port->irq, port->uartclk);
+
+        /* Setup the port parameters accoding to options */
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
+
+        pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
+                 baud, bits, parity, flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+
+static struct uart_driver mpc52xx_uart_driver;
+
+static struct console mpc52xx_console = {
+        .name   = "ttyPSC",
+        .write  = mpc52xx_console_write,
+        .device = uart_console_device,
+        .setup  = mpc52xx_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,   /* Specified on the cmdline (e.g. console=ttyPSC0) */
+        .data   = &mpc52xx_uart_driver,
+};
+
+
+static int __init
+mpc52xx_console_init(void)
+{
+        mpc52xx_uart_of_enumerate();
+        register_console(&mpc52xx_console);
+        return 0;
+}
+
+console_initcall(mpc52xx_console_init);
+
+#define MPC52xx_PSC_CONSOLE &mpc52xx_console
+#else
+#define MPC52xx_PSC_CONSOLE NULL
+#endif
+
+
+/* ======================================================================== */
+/* UART Driver                                                              */
+/* ======================================================================== */
+
+static struct uart_driver mpc52xx_uart_driver = {
+        .driver_name    = "mpc52xx_psc_uart",
+        .dev_name       = "ttyPSC",
+        .major          = SERIAL_PSC_MAJOR,
+        .minor          = SERIAL_PSC_MINOR,
+        .nr             = MPC52xx_PSC_MAXNUM,
+        .cons           = MPC52xx_PSC_CONSOLE,
+};
+
+/* ======================================================================== */
+/* OF Platform Driver                                                       */
+/* ======================================================================== */
+
+static struct of_device_id mpc52xx_uart_of_match[] = {
+#ifdef CONFIG_PPC_MPC52xx
+        { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, },
+        { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
+        /* binding used by old lite5200 device trees: */
+        { .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
+        /* binding used by efika: */
+        { .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
+#endif
+#ifdef CONFIG_PPC_MPC512x
+        { .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
+#endif
+        {},
+};
+
+static int __devinit mpc52xx_uart_of_probe(struct platform_device *op)
+{
+        int idx = -1;
+        unsigned int uartclk;
+        struct uart_port *port = NULL;
+        struct resource res;
+        int ret;
+
+        /* Check validity & presence */
+        for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
+                if (mpc52xx_uart_nodes[idx] == op->dev.of_node)
+                        break;
+        if (idx >= MPC52xx_PSC_MAXNUM)
+                return -EINVAL;
+        pr_debug("Found %s assigned to ttyPSC%x\n",
+                 mpc52xx_uart_nodes[idx]->full_name, idx);
+
+        /* set the uart clock to the input clock of the psc, the different
+         * prescalers are taken into account in the set_baudrate() methods
+         * of the respective chip */
+        uartclk = mpc5xxx_get_bus_frequency(op->dev.of_node);
+        if (uartclk == 0) {
+                dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
+                return -EINVAL;
+        }
+
+        /* Init the port structure */
+        port = &mpc52xx_uart_ports[idx];
+
+        spin_lock_init(&port->lock);
+        port->uartclk = uartclk;
+        port->fifosize  = 512;
+        port->iotype    = UPIO_MEM;
+        port->flags     = UPF_BOOT_AUTOCONF |
+                          (uart_console(port) ? 0 : UPF_IOREMAP);
+        port->line      = idx;
+        port->ops       = &mpc52xx_uart_ops;
+        port->dev       = &op->dev;
+
+        /* Search for IRQ and mapbase */
+        ret = of_address_to_resource(op->dev.of_node, 0, &res);
+        if (ret)
+                return ret;
+
+        port->mapbase = res.start;
+        if (!port->mapbase) {
+                dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
+                return -EINVAL;
+        }
+
+        psc_ops->get_irq(port, op->dev.of_node);
+        if (port->irq == NO_IRQ) {
+                dev_dbg(&op->dev, "Could not get irq\n");
+                return -EINVAL;
+        }
+
+        dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
+                (void *)port->mapbase, port->irq, port->uartclk);
+
+        /* Add the port to the uart sub-system */
+        ret = uart_add_one_port(&mpc52xx_uart_driver, port);
+        if (ret)
+                return ret;
+
+        dev_set_drvdata(&op->dev, (void *)port);
+        return 0;
+}
+
+static int
+mpc52xx_uart_of_remove(struct platform_device *op)
+{
+        struct uart_port *port = dev_get_drvdata(&op->dev);
+        dev_set_drvdata(&op->dev, NULL);
+
+        if (port)
+                uart_remove_one_port(&mpc52xx_uart_driver, port);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int
+mpc52xx_uart_of_suspend(struct platform_device *op, pm_message_t state)
+{
+        struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
+
+        if (port)
+                uart_suspend_port(&mpc52xx_uart_driver, port);
+
+        return 0;
+}
+
+static int
+mpc52xx_uart_of_resume(struct platform_device *op)
+{
+        struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
+
+        if (port)
+                uart_resume_port(&mpc52xx_uart_driver, port);
+
+        return 0;
+}
+#endif
+
+static void
+mpc52xx_uart_of_assign(struct device_node *np)
+{
+        int i;
+
+        /* Find the first free PSC number */
+        for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
+                if (mpc52xx_uart_nodes[i] == NULL) {
+                        of_node_get(np);
+                        mpc52xx_uart_nodes[i] = np;
+                        return;
+                }
+        }
+}
+
+static void
+mpc52xx_uart_of_enumerate(void)
+{
+        static int enum_done;
+        struct device_node *np;
+        const struct  of_device_id *match;
+        int i;
+
+        if (enum_done)
+                return;
+
+        /* Assign index to each PSC in device tree */
+        for_each_matching_node(np, mpc52xx_uart_of_match) {
+                match = of_match_node(mpc52xx_uart_of_match, np);
+                psc_ops = match->data;
+                mpc52xx_uart_of_assign(np);
+        }
+
+        enum_done = 1;
+
+        for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
+                if (mpc52xx_uart_nodes[i])
+                        pr_debug("%s assigned to ttyPSC%x\n",
+                                 mpc52xx_uart_nodes[i]->full_name, i);
+        }
+}
+
+MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
+
+static struct platform_driver mpc52xx_uart_of_driver = {
+        .probe          = mpc52xx_uart_of_probe,
+        .remove         = mpc52xx_uart_of_remove,
+#ifdef CONFIG_PM
+        .suspend        = mpc52xx_uart_of_suspend,
+        .resume         = mpc52xx_uart_of_resume,
+#endif
+        .driver = {
+                .name = "mpc52xx-psc-uart",
+                .owner = THIS_MODULE,
+                .of_match_table = mpc52xx_uart_of_match,
+        },
+};
+
+
+/* ======================================================================== */
+/* Module                                                                   */
+/* ======================================================================== */
+
+static int __init
+mpc52xx_uart_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
+
+        ret = uart_register_driver(&mpc52xx_uart_driver);
+        if (ret) {
+                printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
+                       __FILE__, ret);
+                return ret;
+        }
+
+        mpc52xx_uart_of_enumerate();
+
+        /*
+         * Map the PSC FIFO Controller and init if on MPC512x.
+         */
+        if (psc_ops && psc_ops->fifoc_init) {
+                ret = psc_ops->fifoc_init();
+                if (ret)
+                        return ret;
+        }
+
+        ret = platform_driver_register(&mpc52xx_uart_of_driver);
+        if (ret) {
+                printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
+                       __FILE__, ret);
+                uart_unregister_driver(&mpc52xx_uart_driver);
+                return ret;
+        }
+
+        return 0;
+}
+
+static void __exit
+mpc52xx_uart_exit(void)
+{
+        if (psc_ops->fifoc_uninit)
+                psc_ops->fifoc_uninit();
+
+        platform_driver_unregister(&mpc52xx_uart_of_driver);
+        uart_unregister_driver(&mpc52xx_uart_driver);
+}
+
+
+module_init(mpc52xx_uart_init);
+module_exit(mpc52xx_uart_exit);
+
+MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
+MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
new file mode 100644
index 000000000000..6a9c6605666a
--- /dev/null
+++ b/drivers/tty/serial/mpsc.c
@@ -0,0 +1,2159 @@
+/*
+ * Generic driver for the MPSC (UART mode) on Marvell parts (e.g., GT64240,
+ * GT64260, MV64340, MV64360, GT96100, ... ).
+ *
+ * Author: Mark A. Greer <mgreer@mvista.com>
+ *
+ * Based on an old MPSC driver that was in the linuxppc tree.  It appears to
+ * have been created by Chris Zankel (formerly of MontaVista) but there
+ * is no proper Copyright so I'm not sure.  Apparently, parts were also
+ * taken from PPCBoot (now U-Boot).  Also based on drivers/serial/8250.c
+ * by Russell King.
+ *
+ * 2004 (c) MontaVista, Software, Inc.  This file is licensed under
+ * the terms of the GNU General Public License version 2.  This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+/*
+ * The MPSC interface is much like a typical network controller's interface.
+ * That is, you set up separate rings of descriptors for transmitting and
+ * receiving data.  There is also a pool of buffers with (one buffer per
+ * descriptor) that incoming data are dma'd into or outgoing data are dma'd
+ * out of.
+ *
+ * The MPSC requires two other controllers to be able to work.  The Baud Rate
+ * Generator (BRG) provides a clock at programmable frequencies which determines
+ * the baud rate.  The Serial DMA Controller (SDMA) takes incoming data from the
+ * MPSC and DMA's it into memory or DMA's outgoing data and passes it to the
+ * MPSC.  It is actually the SDMA interrupt that the driver uses to keep the
+ * transmit and receive "engines" going (i.e., indicate data has been
+ * transmitted or received).
+ *
+ * NOTES:
+ *
+ * 1) Some chips have an erratum where several regs cannot be
+ * read.  To work around that, we keep a local copy of those regs in
+ * 'mpsc_port_info'.
+ *
+ * 2) Some chips have an erratum where the ctlr will hang when the SDMA ctlr
+ * accesses system mem with coherency enabled.  For that reason, the driver
+ * assumes that coherency for that ctlr has been disabled.  This means
+ * that when in a cache coherent system, the driver has to manually manage
+ * the data cache on the areas that it touches because the dma_* macro are
+ * basically no-ops.
+ *
+ * 3) There is an erratum (on PPC) where you can't use the instruction to do
+ * a DMA_TO_DEVICE/cache clean so DMA_BIDIRECTIONAL/flushes are used in places
+ * where a DMA_TO_DEVICE/clean would have [otherwise] sufficed.
+ *
+ * 4) AFAICT, hardware flow control isn't supported by the controller --MAG.
+ */
+
+
+#if defined(CONFIG_SERIAL_MPSC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/mv643xx.h>
+#include <linux/platform_device.h>
+#include <linux/gfp.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#define MPSC_NUM_CTLRS          2
+
+/*
+ * Descriptors and buffers must be cache line aligned.
+ * Buffers lengths must be multiple of cache line size.
+ * Number of Tx & Rx descriptors must be powers of 2.
+ */
+#define MPSC_RXR_ENTRIES        32
+#define MPSC_RXRE_SIZE          dma_get_cache_alignment()
+#define MPSC_RXR_SIZE           (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
+#define MPSC_RXBE_SIZE          dma_get_cache_alignment()
+#define MPSC_RXB_SIZE           (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
+
+#define MPSC_TXR_ENTRIES        32
+#define MPSC_TXRE_SIZE          dma_get_cache_alignment()
+#define MPSC_TXR_SIZE           (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
+#define MPSC_TXBE_SIZE          dma_get_cache_alignment()
+#define MPSC_TXB_SIZE           (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
+
+#define MPSC_DMA_ALLOC_SIZE     (MPSC_RXR_SIZE + MPSC_RXB_SIZE + MPSC_TXR_SIZE \
+                + MPSC_TXB_SIZE + dma_get_cache_alignment() /* for alignment */)
+
+/* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
+struct mpsc_rx_desc {
+        u16 bufsize;
+        u16 bytecnt;
+        u32 cmdstat;
+        u32 link;
+        u32 buf_ptr;
+} __attribute((packed));
+
+struct mpsc_tx_desc {
+        u16 bytecnt;
+        u16 shadow;
+        u32 cmdstat;
+        u32 link;
+        u32 buf_ptr;
+} __attribute((packed));
+
+/*
+ * Some regs that have the erratum that you can't read them are are shared
+ * between the two MPSC controllers.  This struct contains those shared regs.
+ */
+struct mpsc_shared_regs {
+        phys_addr_t mpsc_routing_base_p;
+        phys_addr_t sdma_intr_base_p;
+
+        void __iomem *mpsc_routing_base;
+        void __iomem *sdma_intr_base;
+
+        u32 MPSC_MRR_m;
+        u32 MPSC_RCRR_m;
+        u32 MPSC_TCRR_m;
+        u32 SDMA_INTR_CAUSE_m;
+        u32 SDMA_INTR_MASK_m;
+};
+
+/* The main driver data structure */
+struct mpsc_port_info {
+        struct uart_port port;  /* Overlay uart_port structure */
+
+        /* Internal driver state for this ctlr */
+        u8 ready;
+        u8 rcv_data;
+        tcflag_t c_iflag;       /* save termios->c_iflag */
+        tcflag_t c_cflag;       /* save termios->c_cflag */
+
+        /* Info passed in from platform */
+        u8 mirror_regs;         /* Need to mirror regs? */
+        u8 cache_mgmt;          /* Need manual cache mgmt? */
+        u8 brg_can_tune;        /* BRG has baud tuning? */
+        u32 brg_clk_src;
+        u16 mpsc_max_idle;
+        int default_baud;
+        int default_bits;
+        int default_parity;
+        int default_flow;
+
+        /* Physical addresses of various blocks of registers (from platform) */
+        phys_addr_t mpsc_base_p;
+        phys_addr_t sdma_base_p;
+        phys_addr_t brg_base_p;
+
+        /* Virtual addresses of various blocks of registers (from platform) */
+        void __iomem *mpsc_base;
+        void __iomem *sdma_base;
+        void __iomem *brg_base;
+
+        /* Descriptor ring and buffer allocations */
+        void *dma_region;
+        dma_addr_t dma_region_p;
+
+        dma_addr_t rxr;         /* Rx descriptor ring */
+        dma_addr_t rxr_p;       /* Phys addr of rxr */
+        u8 *rxb;                /* Rx Ring I/O buf */
+        u8 *rxb_p;              /* Phys addr of rxb */
+        u32 rxr_posn;           /* First desc w/ Rx data */
+
+        dma_addr_t txr;         /* Tx descriptor ring */
+        dma_addr_t txr_p;       /* Phys addr of txr */
+        u8 *txb;                /* Tx Ring I/O buf */
+        u8 *txb_p;              /* Phys addr of txb */
+        int txr_head;           /* Where new data goes */
+        int txr_tail;           /* Where sent data comes off */
+        spinlock_t tx_lock;     /* transmit lock */
+
+        /* Mirrored values of regs we can't read (if 'mirror_regs' set) */
+        u32 MPSC_MPCR_m;
+        u32 MPSC_CHR_1_m;
+        u32 MPSC_CHR_2_m;
+        u32 MPSC_CHR_10_m;
+        u32 BRG_BCR_m;
+        struct mpsc_shared_regs *shared_regs;
+};
+
+/* Hooks to platform-specific code */
+int mpsc_platform_register_driver(void);
+void mpsc_platform_unregister_driver(void);
+
+/* Hooks back in to mpsc common to be called by platform-specific code */
+struct mpsc_port_info *mpsc_device_probe(int index);
+struct mpsc_port_info *mpsc_device_remove(int index);
+
+/* Main MPSC Configuration Register Offsets */
+#define MPSC_MMCRL                      0x0000
+#define MPSC_MMCRH                      0x0004
+#define MPSC_MPCR                       0x0008
+#define MPSC_CHR_1                      0x000c
+#define MPSC_CHR_2                      0x0010
+#define MPSC_CHR_3                      0x0014
+#define MPSC_CHR_4                      0x0018
+#define MPSC_CHR_5                      0x001c
+#define MPSC_CHR_6                      0x0020
+#define MPSC_CHR_7                      0x0024
+#define MPSC_CHR_8                      0x0028
+#define MPSC_CHR_9                      0x002c
+#define MPSC_CHR_10                     0x0030
+#define MPSC_CHR_11                     0x0034
+
+#define MPSC_MPCR_FRZ                   (1 << 9)
+#define MPSC_MPCR_CL_5                  0
+#define MPSC_MPCR_CL_6                  1
+#define MPSC_MPCR_CL_7                  2
+#define MPSC_MPCR_CL_8                  3
+#define MPSC_MPCR_SBL_1                 0
+#define MPSC_MPCR_SBL_2                 1
+
+#define MPSC_CHR_2_TEV                  (1<<1)
+#define MPSC_CHR_2_TA                   (1<<7)
+#define MPSC_CHR_2_TTCS                 (1<<9)
+#define MPSC_CHR_2_REV                  (1<<17)
+#define MPSC_CHR_2_RA                   (1<<23)
+#define MPSC_CHR_2_CRD                  (1<<25)
+#define MPSC_CHR_2_EH                   (1<<31)
+#define MPSC_CHR_2_PAR_ODD              0
+#define MPSC_CHR_2_PAR_SPACE            1
+#define MPSC_CHR_2_PAR_EVEN             2
+#define MPSC_CHR_2_PAR_MARK             3
+
+/* MPSC Signal Routing */
+#define MPSC_MRR                        0x0000
+#define MPSC_RCRR                       0x0004
+#define MPSC_TCRR                       0x0008
+
+/* Serial DMA Controller Interface Registers */
+#define SDMA_SDC                        0x0000
+#define SDMA_SDCM                       0x0008
+#define SDMA_RX_DESC                    0x0800
+#define SDMA_RX_BUF_PTR                 0x0808
+#define SDMA_SCRDP                      0x0810
+#define SDMA_TX_DESC                    0x0c00
+#define SDMA_SCTDP                      0x0c10
+#define SDMA_SFTDP                      0x0c14
+
+#define SDMA_DESC_CMDSTAT_PE            (1<<0)
+#define SDMA_DESC_CMDSTAT_CDL           (1<<1)
+#define SDMA_DESC_CMDSTAT_FR            (1<<3)
+#define SDMA_DESC_CMDSTAT_OR            (1<<6)
+#define SDMA_DESC_CMDSTAT_BR            (1<<9)
+#define SDMA_DESC_CMDSTAT_MI            (1<<10)
+#define SDMA_DESC_CMDSTAT_A             (1<<11)
+#define SDMA_DESC_CMDSTAT_AM            (1<<12)
+#define SDMA_DESC_CMDSTAT_CT            (1<<13)
+#define SDMA_DESC_CMDSTAT_C             (1<<14)
+#define SDMA_DESC_CMDSTAT_ES            (1<<15)
+#define SDMA_DESC_CMDSTAT_L             (1<<16)
+#define SDMA_DESC_CMDSTAT_F             (1<<17)
+#define SDMA_DESC_CMDSTAT_P             (1<<18)
+#define SDMA_DESC_CMDSTAT_EI            (1<<23)
+#define SDMA_DESC_CMDSTAT_O             (1<<31)
+
+#define SDMA_DESC_DFLT                  (SDMA_DESC_CMDSTAT_O \
+                | SDMA_DESC_CMDSTAT_EI)
+
+#define SDMA_SDC_RFT                    (1<<0)
+#define SDMA_SDC_SFM                    (1<<1)
+#define SDMA_SDC_BLMR                   (1<<6)
+#define SDMA_SDC_BLMT                   (1<<7)
+#define SDMA_SDC_POVR                   (1<<8)
+#define SDMA_SDC_RIFB                   (1<<9)
+
+#define SDMA_SDCM_ERD                   (1<<7)
+#define SDMA_SDCM_AR                    (1<<15)
+#define SDMA_SDCM_STD                   (1<<16)
+#define SDMA_SDCM_TXD                   (1<<23)
+#define SDMA_SDCM_AT                    (1<<31)
+
+#define SDMA_0_CAUSE_RXBUF              (1<<0)
+#define SDMA_0_CAUSE_RXERR              (1<<1)
+#define SDMA_0_CAUSE_TXBUF              (1<<2)
+#define SDMA_0_CAUSE_TXEND              (1<<3)
+#define SDMA_1_CAUSE_RXBUF              (1<<8)
+#define SDMA_1_CAUSE_RXERR              (1<<9)
+#define SDMA_1_CAUSE_TXBUF              (1<<10)
+#define SDMA_1_CAUSE_TXEND              (1<<11)
+
+#define SDMA_CAUSE_RX_MASK      (SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR \
+                | SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR)
+#define SDMA_CAUSE_TX_MASK      (SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND \
+                | SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND)
+
+/* SDMA Interrupt registers */
+#define SDMA_INTR_CAUSE                 0x0000
+#define SDMA_INTR_MASK                  0x0080
+
+/* Baud Rate Generator Interface Registers */
+#define BRG_BCR                         0x0000
+#define BRG_BTR                         0x0004
+
+/*
+ * Define how this driver is known to the outside (we've been assigned a
+ * range on the "Low-density serial ports" major).
+ */
+#define MPSC_MAJOR                      204
+#define MPSC_MINOR_START                44
+#define MPSC_DRIVER_NAME                "MPSC"
+#define MPSC_DEV_NAME                   "ttyMM"
+#define MPSC_VERSION                    "1.00"
+
+static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS];
+static struct mpsc_shared_regs mpsc_shared_regs;
+static struct uart_driver mpsc_reg;
+
+static void mpsc_start_rx(struct mpsc_port_info *pi);
+static void mpsc_free_ring_mem(struct mpsc_port_info *pi);
+static void mpsc_release_port(struct uart_port *port);
+/*
+ ******************************************************************************
+ *
+ * Baud Rate Generator Routines (BRG)
+ *
+ ******************************************************************************
+ */
+static void mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src)
+{
+        u32     v;
+
+        v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
+        v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18);
+
+        if (pi->brg_can_tune)
+                v &= ~(1 << 25);
+
+        if (pi->mirror_regs)
+                pi->BRG_BCR_m = v;
+        writel(v, pi->brg_base + BRG_BCR);
+
+        writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000,
+                pi->brg_base + BRG_BTR);
+}
+
+static void mpsc_brg_enable(struct mpsc_port_info *pi)
+{
+        u32     v;
+
+        v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
+        v |= (1 << 16);
+
+        if (pi->mirror_regs)
+                pi->BRG_BCR_m = v;
+        writel(v, pi->brg_base + BRG_BCR);
+}
+
+static void mpsc_brg_disable(struct mpsc_port_info *pi)
+{
+        u32     v;
+
+        v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
+        v &= ~(1 << 16);
+
+        if (pi->mirror_regs)
+                pi->BRG_BCR_m = v;
+        writel(v, pi->brg_base + BRG_BCR);
+}
+
+/*
+ * To set the baud, we adjust the CDV field in the BRG_BCR reg.
+ * From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1.
+ * However, the input clock is divided by 16 in the MPSC b/c of how
+ * 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our
+ * calculation by 16 to account for that.  So the real calculation
+ * that accounts for the way the mpsc is set up is:
+ * CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1.
+ */
+static void mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud)
+{
+        u32     cdv = (pi->port.uartclk / (baud << 5)) - 1;
+        u32     v;
+
+        mpsc_brg_disable(pi);
+        v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
+        v = (v & 0xffff0000) | (cdv & 0xffff);
+
+        if (pi->mirror_regs)
+                pi->BRG_BCR_m = v;
+        writel(v, pi->brg_base + BRG_BCR);
+        mpsc_brg_enable(pi);
+}
+
+/*
+ ******************************************************************************
+ *
+ * Serial DMA Routines (SDMA)
+ *
+ ******************************************************************************
+ */
+
+static void mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size)
+{
+        u32     v;
+
+        pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n",
+                        pi->port.line, burst_size);
+
+        burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */
+
+        if (burst_size < 2)
+                v = 0x0;        /* 1 64-bit word */
+        else if (burst_size < 4)
+                v = 0x1;        /* 2 64-bit words */
+        else if (burst_size < 8)
+                v = 0x2;        /* 4 64-bit words */
+        else
+                v = 0x3;        /* 8 64-bit words */
+
+        writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12),
+                pi->sdma_base + SDMA_SDC);
+}
+
+static void mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size)
+{
+        pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line,
+                burst_size);
+
+        writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f,
+                pi->sdma_base + SDMA_SDC);
+        mpsc_sdma_burstsize(pi, burst_size);
+}
+
+static u32 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask)
+{
+        u32     old, v;
+
+        pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask);
+
+        old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
+                readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
+
+        mask &= 0xf;
+        if (pi->port.line)
+                mask <<= 8;
+        v &= ~mask;
+
+        if (pi->mirror_regs)
+                pi->shared_regs->SDMA_INTR_MASK_m = v;
+        writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
+
+        if (pi->port.line)
+                old >>= 8;
+        return old & 0xf;
+}
+
+static void mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask)
+{
+        u32     v;
+
+        pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask);
+
+        v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m
+                : readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
+
+        mask &= 0xf;
+        if (pi->port.line)
+                mask <<= 8;
+        v |= mask;
+
+        if (pi->mirror_regs)
+                pi->shared_regs->SDMA_INTR_MASK_m = v;
+        writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
+}
+
+static void mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
+{
+        pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line);
+
+        if (pi->mirror_regs)
+                pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
+        writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE
+                        + pi->port.line);
+}
+
+static void mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi,
+                struct mpsc_rx_desc *rxre_p)
+{
+        pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n",
+                pi->port.line, (u32)rxre_p);
+
+        writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP);
+}
+
+static void mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi,
+                struct mpsc_tx_desc *txre_p)
+{
+        writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP);
+        writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP);
+}
+
+static void mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val)
+{
+        u32     v;
+
+        v = readl(pi->sdma_base + SDMA_SDCM);
+        if (val)
+                v |= val;
+        else
+                v = 0;
+        wmb();
+        writel(v, pi->sdma_base + SDMA_SDCM);
+        wmb();
+}
+
+static uint mpsc_sdma_tx_active(struct mpsc_port_info *pi)
+{
+        return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD;
+}
+
+static void mpsc_sdma_start_tx(struct mpsc_port_info *pi)
+{
+        struct mpsc_tx_desc *txre, *txre_p;
+
+        /* If tx isn't running & there's a desc ready to go, start it */
+        if (!mpsc_sdma_tx_active(pi)) {
+                txre = (struct mpsc_tx_desc *)(pi->txr
+                                + (pi->txr_tail * MPSC_TXRE_SIZE));
+                dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
+                                DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        invalidate_dcache_range((ulong)txre,
+                                        (ulong)txre + MPSC_TXRE_SIZE);
+#endif
+
+                if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
+                        txre_p = (struct mpsc_tx_desc *)
+                                (pi->txr_p + (pi->txr_tail * MPSC_TXRE_SIZE));
+
+                        mpsc_sdma_set_tx_ring(pi, txre_p);
+                        mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
+                }
+        }
+}
+
+static void mpsc_sdma_stop(struct mpsc_port_info *pi)
+{
+        pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line);
+
+        /* Abort any SDMA transfers */
+        mpsc_sdma_cmd(pi, 0);
+        mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT);
+
+        /* Clear the SDMA current and first TX and RX pointers */
+        mpsc_sdma_set_tx_ring(pi, NULL);
+        mpsc_sdma_set_rx_ring(pi, NULL);
+
+        /* Disable interrupts */
+        mpsc_sdma_intr_mask(pi, 0xf);
+        mpsc_sdma_intr_ack(pi);
+}
+
+/*
+ ******************************************************************************
+ *
+ * Multi-Protocol Serial Controller Routines (MPSC)
+ *
+ ******************************************************************************
+ */
+
+static void mpsc_hw_init(struct mpsc_port_info *pi)
+{
+        u32     v;
+
+        pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line);
+
+        /* Set up clock routing */
+        if (pi->mirror_regs) {
+                v = pi->shared_regs->MPSC_MRR_m;
+                v &= ~0x1c7;
+                pi->shared_regs->MPSC_MRR_m = v;
+                writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
+
+                v = pi->shared_regs->MPSC_RCRR_m;
+                v = (v & ~0xf0f) | 0x100;
+                pi->shared_regs->MPSC_RCRR_m = v;
+                writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
+
+                v = pi->shared_regs->MPSC_TCRR_m;
+                v = (v & ~0xf0f) | 0x100;
+                pi->shared_regs->MPSC_TCRR_m = v;
+                writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
+        } else {
+                v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR);
+                v &= ~0x1c7;
+                writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
+
+                v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
+                v = (v & ~0xf0f) | 0x100;
+                writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
+
+                v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
+                v = (v & ~0xf0f) | 0x100;
+                writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
+        }
+
+        /* Put MPSC in UART mode & enabel Tx/Rx egines */
+        writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL);
+
+        /* No preamble, 16x divider, low-latency, */
+        writel(0x04400400, pi->mpsc_base + MPSC_MMCRH);
+        mpsc_set_baudrate(pi, pi->default_baud);
+
+        if (pi->mirror_regs) {
+                pi->MPSC_CHR_1_m = 0;
+                pi->MPSC_CHR_2_m = 0;
+        }
+        writel(0, pi->mpsc_base + MPSC_CHR_1);
+        writel(0, pi->mpsc_base + MPSC_CHR_2);
+        writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3);
+        writel(0, pi->mpsc_base + MPSC_CHR_4);
+        writel(0, pi->mpsc_base + MPSC_CHR_5);
+        writel(0, pi->mpsc_base + MPSC_CHR_6);
+        writel(0, pi->mpsc_base + MPSC_CHR_7);
+        writel(0, pi->mpsc_base + MPSC_CHR_8);
+        writel(0, pi->mpsc_base + MPSC_CHR_9);
+        writel(0, pi->mpsc_base + MPSC_CHR_10);
+}
+
+static void mpsc_enter_hunt(struct mpsc_port_info *pi)
+{
+        pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line);
+
+        if (pi->mirror_regs) {
+                writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH,
+                        pi->mpsc_base + MPSC_CHR_2);
+                /* Erratum prevents reading CHR_2 so just delay for a while */
+                udelay(100);
+        } else {
+                writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH,
+                                pi->mpsc_base + MPSC_CHR_2);
+
+                while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH)
+                        udelay(10);
+        }
+}
+
+static void mpsc_freeze(struct mpsc_port_info *pi)
+{
+        u32     v;
+
+        pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line);
+
+        v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
+                readl(pi->mpsc_base + MPSC_MPCR);
+        v |= MPSC_MPCR_FRZ;
+
+        if (pi->mirror_regs)
+                pi->MPSC_MPCR_m = v;
+        writel(v, pi->mpsc_base + MPSC_MPCR);
+}
+
+static void mpsc_unfreeze(struct mpsc_port_info *pi)
+{
+        u32     v;
+
+        v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
+                readl(pi->mpsc_base + MPSC_MPCR);
+        v &= ~MPSC_MPCR_FRZ;
+
+        if (pi->mirror_regs)
+                pi->MPSC_MPCR_m = v;
+        writel(v, pi->mpsc_base + MPSC_MPCR);
+
+        pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line);
+}
+
+static void mpsc_set_char_length(struct mpsc_port_info *pi, u32 len)
+{
+        u32     v;
+
+        pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len);
+
+        v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
+                readl(pi->mpsc_base + MPSC_MPCR);
+        v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12);
+
+        if (pi->mirror_regs)
+                pi->MPSC_MPCR_m = v;
+        writel(v, pi->mpsc_base + MPSC_MPCR);
+}
+
+static void mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len)
+{
+        u32     v;
+
+        pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n",
+                pi->port.line, len);
+
+        v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
+                readl(pi->mpsc_base + MPSC_MPCR);
+
+        v = (v & ~(1 << 14)) | ((len & 0x1) << 14);
+
+        if (pi->mirror_regs)
+                pi->MPSC_MPCR_m = v;
+        writel(v, pi->mpsc_base + MPSC_MPCR);
+}
+
+static void mpsc_set_parity(struct mpsc_port_info *pi, u32 p)
+{
+        u32     v;
+
+        pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p);
+
+        v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m :
+                readl(pi->mpsc_base + MPSC_CHR_2);
+
+        p &= 0x3;
+        v = (v & ~0xc000c) | (p << 18) | (p << 2);
+
+        if (pi->mirror_regs)
+                pi->MPSC_CHR_2_m = v;
+        writel(v, pi->mpsc_base + MPSC_CHR_2);
+}
+
+/*
+ ******************************************************************************
+ *
+ * Driver Init Routines
+ *
+ ******************************************************************************
+ */
+
+static void mpsc_init_hw(struct mpsc_port_info *pi)
+{
+        pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line);
+
+        mpsc_brg_init(pi, pi->brg_clk_src);
+        mpsc_brg_enable(pi);
+        mpsc_sdma_init(pi, dma_get_cache_alignment());  /* burst a cacheline */
+        mpsc_sdma_stop(pi);
+        mpsc_hw_init(pi);
+}
+
+static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
+{
+        int rc = 0;
+
+        pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
+                pi->port.line);
+
+        if (!pi->dma_region) {
+                if (!dma_supported(pi->port.dev, 0xffffffff)) {
+                        printk(KERN_ERR "MPSC: Inadequate DMA support\n");
+                        rc = -ENXIO;
+                } else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,
+                                                MPSC_DMA_ALLOC_SIZE,
+                                                &pi->dma_region_p, GFP_KERNEL))
+                                == NULL) {
+                        printk(KERN_ERR "MPSC: Can't alloc Desc region\n");
+                        rc = -ENOMEM;
+                }
+        }
+
+        return rc;
+}
+
+static void mpsc_free_ring_mem(struct mpsc_port_info *pi)
+{
+        pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
+
+        if (pi->dma_region) {
+                dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
+                                pi->dma_region, pi->dma_region_p);
+                pi->dma_region = NULL;
+                pi->dma_region_p = (dma_addr_t)NULL;
+        }
+}
+
+static void mpsc_init_rings(struct mpsc_port_info *pi)
+{
+        struct mpsc_rx_desc *rxre;
+        struct mpsc_tx_desc *txre;
+        dma_addr_t dp, dp_p;
+        u8 *bp, *bp_p;
+        int i;
+
+        pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line);
+
+        BUG_ON(pi->dma_region == NULL);
+
+        memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
+
+        /*
+         * Descriptors & buffers are multiples of cacheline size and must be
+         * cacheline aligned.
+         */
+        dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment());
+        dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment());
+
+        /*
+         * Partition dma region into rx ring descriptor, rx buffers,
+         * tx ring descriptors, and tx buffers.
+         */
+        pi->rxr = dp;
+        pi->rxr_p = dp_p;
+        dp += MPSC_RXR_SIZE;
+        dp_p += MPSC_RXR_SIZE;
+
+        pi->rxb = (u8 *)dp;
+        pi->rxb_p = (u8 *)dp_p;
+        dp += MPSC_RXB_SIZE;
+        dp_p += MPSC_RXB_SIZE;
+
+        pi->rxr_posn = 0;
+
+        pi->txr = dp;
+        pi->txr_p = dp_p;
+        dp += MPSC_TXR_SIZE;
+        dp_p += MPSC_TXR_SIZE;
+
+        pi->txb = (u8 *)dp;
+        pi->txb_p = (u8 *)dp_p;
+
+        pi->txr_head = 0;
+        pi->txr_tail = 0;
+
+        /* Init rx ring descriptors */
+        dp = pi->rxr;
+        dp_p = pi->rxr_p;
+        bp = pi->rxb;
+        bp_p = pi->rxb_p;
+
+        for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
+                rxre = (struct mpsc_rx_desc *)dp;
+
+                rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
+                rxre->bytecnt = cpu_to_be16(0);
+                rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
+                                | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
+                                | SDMA_DESC_CMDSTAT_L);
+                rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
+                rxre->buf_ptr = cpu_to_be32(bp_p);
+
+                dp += MPSC_RXRE_SIZE;
+                dp_p += MPSC_RXRE_SIZE;
+                bp += MPSC_RXBE_SIZE;
+                bp_p += MPSC_RXBE_SIZE;
+        }
+        rxre->link = cpu_to_be32(pi->rxr_p);    /* Wrap last back to first */
+
+        /* Init tx ring descriptors */
+        dp = pi->txr;
+        dp_p = pi->txr_p;
+        bp = pi->txb;
+        bp_p = pi->txb_p;
+
+        for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
+                txre = (struct mpsc_tx_desc *)dp;
+
+                txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
+                txre->buf_ptr = cpu_to_be32(bp_p);
+
+                dp += MPSC_TXRE_SIZE;
+                dp_p += MPSC_TXRE_SIZE;
+                bp += MPSC_TXBE_SIZE;
+                bp_p += MPSC_TXBE_SIZE;
+        }
+        txre->link = cpu_to_be32(pi->txr_p);    /* Wrap last back to first */
+
+        dma_cache_sync(pi->port.dev, (void *)pi->dma_region,
+                        MPSC_DMA_ALLOC_SIZE, DMA_BIDIRECTIONAL);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        flush_dcache_range((ulong)pi->dma_region,
+                                        (ulong)pi->dma_region
+                                        + MPSC_DMA_ALLOC_SIZE);
+#endif
+
+        return;
+}
+
+static void mpsc_uninit_rings(struct mpsc_port_info *pi)
+{
+        pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line);
+
+        BUG_ON(pi->dma_region == NULL);
+
+        pi->rxr = 0;
+        pi->rxr_p = 0;
+        pi->rxb = NULL;
+        pi->rxb_p = NULL;
+        pi->rxr_posn = 0;
+
+        pi->txr = 0;
+        pi->txr_p = 0;
+        pi->txb = NULL;
+        pi->txb_p = NULL;
+        pi->txr_head = 0;
+        pi->txr_tail = 0;
+}
+
+static int mpsc_make_ready(struct mpsc_port_info *pi)
+{
+        int rc;
+
+        pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line);
+
+        if (!pi->ready) {
+                mpsc_init_hw(pi);
+                if ((rc = mpsc_alloc_ring_mem(pi)))
+                        return rc;
+                mpsc_init_rings(pi);
+                pi->ready = 1;
+        }
+
+        return 0;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int serial_polled;
+#endif
+
+/*
+ ******************************************************************************
+ *
+ * Interrupt Handling Routines
+ *
+ ******************************************************************************
+ */
+
+static int mpsc_rx_intr(struct mpsc_port_info *pi)
+{
+        struct mpsc_rx_desc *rxre;
+        struct tty_struct *tty = pi->port.state->port.tty;
+        u32     cmdstat, bytes_in, i;
+        int     rc = 0;
+        u8      *bp;
+        char    flag = TTY_NORMAL;
+
+        pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
+
+        rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
+
+        dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
+                        DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+        if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                invalidate_dcache_range((ulong)rxre,
+                                (ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+
+        /*
+         * Loop through Rx descriptors handling ones that have been completed.
+         */
+        while (!((cmdstat = be32_to_cpu(rxre->cmdstat))
+                                & SDMA_DESC_CMDSTAT_O)) {
+                bytes_in = be16_to_cpu(rxre->bytecnt);
+#ifdef CONFIG_CONSOLE_POLL
+                if (unlikely(serial_polled)) {
+                        serial_polled = 0;
+                        return 0;
+                }
+#endif
+                /* Following use of tty struct directly is deprecated */
+                if (unlikely(tty_buffer_request_room(tty, bytes_in)
+                                        < bytes_in)) {
+                        if (tty->low_latency)
+                                tty_flip_buffer_push(tty);
+                        /*
+                         * If this failed then we will throw away the bytes
+                         * but must do so to clear interrupts.
+                         */
+                }
+
+                bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
+                dma_cache_sync(pi->port.dev, (void *)bp, MPSC_RXBE_SIZE,
+                                DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        invalidate_dcache_range((ulong)bp,
+                                        (ulong)bp + MPSC_RXBE_SIZE);
+#endif
+
+                /*
+                 * Other than for parity error, the manual provides little
+                 * info on what data will be in a frame flagged by any of
+                 * these errors.  For parity error, it is the last byte in
+                 * the buffer that had the error.  As for the rest, I guess
+                 * we'll assume there is no data in the buffer.
+                 * If there is...it gets lost.
+                 */
+                if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR
+                                                | SDMA_DESC_CMDSTAT_FR
+                                                | SDMA_DESC_CMDSTAT_OR))) {
+
+                        pi->port.icount.rx++;
+
+                        if (cmdstat & SDMA_DESC_CMDSTAT_BR) {   /* Break */
+                                pi->port.icount.brk++;
+
+                                if (uart_handle_break(&pi->port))
+                                        goto next_frame;
+                        } else if (cmdstat & SDMA_DESC_CMDSTAT_FR) {
+                                pi->port.icount.frame++;
+                        } else if (cmdstat & SDMA_DESC_CMDSTAT_OR) {
+                                pi->port.icount.overrun++;
+                        }
+
+                        cmdstat &= pi->port.read_status_mask;
+
+                        if (cmdstat & SDMA_DESC_CMDSTAT_BR)
+                                flag = TTY_BREAK;
+                        else if (cmdstat & SDMA_DESC_CMDSTAT_FR)
+                                flag = TTY_FRAME;
+                        else if (cmdstat & SDMA_DESC_CMDSTAT_OR)
+                                flag = TTY_OVERRUN;
+                        else if (cmdstat & SDMA_DESC_CMDSTAT_PE)
+                                flag = TTY_PARITY;
+                }
+
+                if (uart_handle_sysrq_char(&pi->port, *bp)) {
+                        bp++;
+                        bytes_in--;
+#ifdef CONFIG_CONSOLE_POLL
+                        if (unlikely(serial_polled)) {
+                                serial_polled = 0;
+                                return 0;
+                        }
+#endif
+                        goto next_frame;
+                }
+
+                if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR
+                                                | SDMA_DESC_CMDSTAT_FR
+                                                | SDMA_DESC_CMDSTAT_OR)))
+                                && !(cmdstat & pi->port.ignore_status_mask)) {
+                        tty_insert_flip_char(tty, *bp, flag);
+                } else {
+                        for (i=0; i<bytes_in; i++)
+                                tty_insert_flip_char(tty, *bp++, TTY_NORMAL);
+
+                        pi->port.icount.rx += bytes_in;
+                }
+
+next_frame:
+                rxre->bytecnt = cpu_to_be16(0);
+                wmb();
+                rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
+                                | SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
+                                | SDMA_DESC_CMDSTAT_L);
+                wmb();
+                dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
+                                DMA_BIDIRECTIONAL);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        flush_dcache_range((ulong)rxre,
+                                        (ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+
+                /* Advance to next descriptor */
+                pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1);
+                rxre = (struct mpsc_rx_desc *)
+                        (pi->rxr + (pi->rxr_posn * MPSC_RXRE_SIZE));
+                dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
+                                DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        invalidate_dcache_range((ulong)rxre,
+                                        (ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+                rc = 1;
+        }
+
+        /* Restart rx engine, if its stopped */
+        if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
+                mpsc_start_rx(pi);
+
+        tty_flip_buffer_push(tty);
+        return rc;
+}
+
+static void mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
+{
+        struct mpsc_tx_desc *txre;
+
+        txre = (struct mpsc_tx_desc *)(pi->txr
+                        + (pi->txr_head * MPSC_TXRE_SIZE));
+
+        txre->bytecnt = cpu_to_be16(count);
+        txre->shadow = txre->bytecnt;
+        wmb();                  /* ensure cmdstat is last field updated */
+        txre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O | SDMA_DESC_CMDSTAT_F
+                        | SDMA_DESC_CMDSTAT_L
+                        | ((intr) ? SDMA_DESC_CMDSTAT_EI : 0));
+        wmb();
+        dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
+                        DMA_BIDIRECTIONAL);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+        if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                flush_dcache_range((ulong)txre,
+                                (ulong)txre + MPSC_TXRE_SIZE);
+#endif
+}
+
+static void mpsc_copy_tx_data(struct mpsc_port_info *pi)
+{
+        struct circ_buf *xmit = &pi->port.state->xmit;
+        u8 *bp;
+        u32 i;
+
+        /* Make sure the desc ring isn't full */
+        while (CIRC_CNT(pi->txr_head, pi->txr_tail, MPSC_TXR_ENTRIES)
+                        < (MPSC_TXR_ENTRIES - 1)) {
+                if (pi->port.x_char) {
+                        /*
+                         * Ideally, we should use the TCS field in
+                         * CHR_1 to put the x_char out immediately but
+                         * errata prevents us from being able to read
+                         * CHR_2 to know that its safe to write to
+                         * CHR_1.  Instead, just put it in-band with
+                         * all the other Tx data.
+                         */
+                        bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
+                        *bp = pi->port.x_char;
+                        pi->port.x_char = 0;
+                        i = 1;
+                } else if (!uart_circ_empty(xmit)
+                                && !uart_tx_stopped(&pi->port)) {
+                        i = min((u32)MPSC_TXBE_SIZE,
+                                (u32)uart_circ_chars_pending(xmit));
+                        i = min(i, (u32)CIRC_CNT_TO_END(xmit->head, xmit->tail,
+                                UART_XMIT_SIZE));
+                        bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
+                        memcpy(bp, &xmit->buf[xmit->tail], i);
+                        xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1);
+
+                        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                                uart_write_wakeup(&pi->port);
+                } else { /* All tx data copied into ring bufs */
+                        return;
+                }
+
+                dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
+                                DMA_BIDIRECTIONAL);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        flush_dcache_range((ulong)bp,
+                                        (ulong)bp + MPSC_TXBE_SIZE);
+#endif
+                mpsc_setup_tx_desc(pi, i, 1);
+
+                /* Advance to next descriptor */
+                pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
+        }
+}
+
+static int mpsc_tx_intr(struct mpsc_port_info *pi)
+{
+        struct mpsc_tx_desc *txre;
+        int rc = 0;
+        unsigned long iflags;
+
+        spin_lock_irqsave(&pi->tx_lock, iflags);
+
+        if (!mpsc_sdma_tx_active(pi)) {
+                txre = (struct mpsc_tx_desc *)(pi->txr
+                                + (pi->txr_tail * MPSC_TXRE_SIZE));
+
+                dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
+                                DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        invalidate_dcache_range((ulong)txre,
+                                        (ulong)txre + MPSC_TXRE_SIZE);
+#endif
+
+                while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) {
+                        rc = 1;
+                        pi->port.icount.tx += be16_to_cpu(txre->bytecnt);
+                        pi->txr_tail = (pi->txr_tail+1) & (MPSC_TXR_ENTRIES-1);
+
+                        /* If no more data to tx, fall out of loop */
+                        if (pi->txr_head == pi->txr_tail)
+                                break;
+
+                        txre = (struct mpsc_tx_desc *)(pi->txr
+                                        + (pi->txr_tail * MPSC_TXRE_SIZE));
+                        dma_cache_sync(pi->port.dev, (void *)txre,
+                                        MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                        if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                                invalidate_dcache_range((ulong)txre,
+                                                (ulong)txre + MPSC_TXRE_SIZE);
+#endif
+                }
+
+                mpsc_copy_tx_data(pi);
+                mpsc_sdma_start_tx(pi); /* start next desc if ready */
+        }
+
+        spin_unlock_irqrestore(&pi->tx_lock, iflags);
+        return rc;
+}
+
+/*
+ * This is the driver's interrupt handler.  To avoid a race, we first clear
+ * the interrupt, then handle any completed Rx/Tx descriptors.  When done
+ * handling those descriptors, we restart the Rx/Tx engines if they're stopped.
+ */
+static irqreturn_t mpsc_sdma_intr(int irq, void *dev_id)
+{
+        struct mpsc_port_info *pi = dev_id;
+        ulong iflags;
+        int rc = IRQ_NONE;
+
+        pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Received\n",pi->port.line);
+
+        spin_lock_irqsave(&pi->port.lock, iflags);
+        mpsc_sdma_intr_ack(pi);
+        if (mpsc_rx_intr(pi))
+                rc = IRQ_HANDLED;
+        if (mpsc_tx_intr(pi))
+                rc = IRQ_HANDLED;
+        spin_unlock_irqrestore(&pi->port.lock, iflags);
+
+        pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Handled\n", pi->port.line);
+        return rc;
+}
+
+/*
+ ******************************************************************************
+ *
+ * serial_core.c Interface routines
+ *
+ ******************************************************************************
+ */
+static uint mpsc_tx_empty(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        ulong iflags;
+        uint rc;
+
+        spin_lock_irqsave(&pi->port.lock, iflags);
+        rc = mpsc_sdma_tx_active(pi) ? 0 : TIOCSER_TEMT;
+        spin_unlock_irqrestore(&pi->port.lock, iflags);
+
+        return rc;
+}
+
+static void mpsc_set_mctrl(struct uart_port *port, uint mctrl)
+{
+        /* Have no way to set modem control lines AFAICT */
+}
+
+static uint mpsc_get_mctrl(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        u32 mflags, status;
+
+        status = (pi->mirror_regs) ? pi->MPSC_CHR_10_m
+                : readl(pi->mpsc_base + MPSC_CHR_10);
+
+        mflags = 0;
+        if (status & 0x1)
+                mflags |= TIOCM_CTS;
+        if (status & 0x2)
+                mflags |= TIOCM_CAR;
+
+        return mflags | TIOCM_DSR;      /* No way to tell if DSR asserted */
+}
+
+static void mpsc_stop_tx(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+
+        pr_debug("mpsc_stop_tx[%d]\n", port->line);
+
+        mpsc_freeze(pi);
+}
+
+static void mpsc_start_tx(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        unsigned long iflags;
+
+        spin_lock_irqsave(&pi->tx_lock, iflags);
+
+        mpsc_unfreeze(pi);
+        mpsc_copy_tx_data(pi);
+        mpsc_sdma_start_tx(pi);
+
+        spin_unlock_irqrestore(&pi->tx_lock, iflags);
+
+        pr_debug("mpsc_start_tx[%d]\n", port->line);
+}
+
+static void mpsc_start_rx(struct mpsc_port_info *pi)
+{
+        pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line);
+
+        if (pi->rcv_data) {
+                mpsc_enter_hunt(pi);
+                mpsc_sdma_cmd(pi, SDMA_SDCM_ERD);
+        }
+}
+
+static void mpsc_stop_rx(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+
+        pr_debug("mpsc_stop_rx[%d]: Stopping...\n", port->line);
+
+        if (pi->mirror_regs) {
+                writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_RA,
+                                pi->mpsc_base + MPSC_CHR_2);
+                /* Erratum prevents reading CHR_2 so just delay for a while */
+                udelay(100);
+        } else {
+                writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_RA,
+                                pi->mpsc_base + MPSC_CHR_2);
+
+                while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_RA)
+                        udelay(10);
+        }
+
+        mpsc_sdma_cmd(pi, SDMA_SDCM_AR);
+}
+
+static void mpsc_enable_ms(struct uart_port *port)
+{
+}
+
+static void mpsc_break_ctl(struct uart_port *port, int ctl)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        ulong   flags;
+        u32     v;
+
+        v = ctl ? 0x00ff0000 : 0;
+
+        spin_lock_irqsave(&pi->port.lock, flags);
+        if (pi->mirror_regs)
+                pi->MPSC_CHR_1_m = v;
+        writel(v, pi->mpsc_base + MPSC_CHR_1);
+        spin_unlock_irqrestore(&pi->port.lock, flags);
+}
+
+static int mpsc_startup(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        u32 flag = 0;
+        int rc;
+
+        pr_debug("mpsc_startup[%d]: Starting up MPSC, irq: %d\n",
+                port->line, pi->port.irq);
+
+        if ((rc = mpsc_make_ready(pi)) == 0) {
+                /* Setup IRQ handler */
+                mpsc_sdma_intr_ack(pi);
+
+                /* If irq's are shared, need to set flag */
+                if (mpsc_ports[0].port.irq == mpsc_ports[1].port.irq)
+                        flag = IRQF_SHARED;
+
+                if (request_irq(pi->port.irq, mpsc_sdma_intr, flag,
+                                        "mpsc-sdma", pi))
+                        printk(KERN_ERR "MPSC: Can't get SDMA IRQ %d\n",
+                                        pi->port.irq);
+
+                mpsc_sdma_intr_unmask(pi, 0xf);
+                mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p
+                                        + (pi->rxr_posn * MPSC_RXRE_SIZE)));
+        }
+
+        return rc;
+}
+
+static void mpsc_shutdown(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+
+        pr_debug("mpsc_shutdown[%d]: Shutting down MPSC\n", port->line);
+
+        mpsc_sdma_stop(pi);
+        free_irq(pi->port.irq, pi);
+}
+
+static void mpsc_set_termios(struct uart_port *port, struct ktermios *termios,
+                 struct ktermios *old)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        u32 baud;
+        ulong flags;
+        u32 chr_bits, stop_bits, par;
+
+        pi->c_iflag = termios->c_iflag;
+        pi->c_cflag = termios->c_cflag;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                chr_bits = MPSC_MPCR_CL_5;
+                break;
+        case CS6:
+                chr_bits = MPSC_MPCR_CL_6;
+                break;
+        case CS7:
+                chr_bits = MPSC_MPCR_CL_7;
+                break;
+        case CS8:
+        default:
+                chr_bits = MPSC_MPCR_CL_8;
+                break;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                stop_bits = MPSC_MPCR_SBL_2;
+        else
+                stop_bits = MPSC_MPCR_SBL_1;
+
+        par = MPSC_CHR_2_PAR_EVEN;
+        if (termios->c_cflag & PARENB)
+                if (termios->c_cflag & PARODD)
+                        par = MPSC_CHR_2_PAR_ODD;
+#ifdef  CMSPAR
+                if (termios->c_cflag & CMSPAR) {
+                        if (termios->c_cflag & PARODD)
+                                par = MPSC_CHR_2_PAR_MARK;
+                        else
+                                par = MPSC_CHR_2_PAR_SPACE;
+                }
+#endif
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk);
+
+        spin_lock_irqsave(&pi->port.lock, flags);
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        mpsc_set_char_length(pi, chr_bits);
+        mpsc_set_stop_bit_length(pi, stop_bits);
+        mpsc_set_parity(pi, par);
+        mpsc_set_baudrate(pi, baud);
+
+        /* Characters/events to read */
+        pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR;
+
+        if (termios->c_iflag & INPCK)
+                pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE
+                        | SDMA_DESC_CMDSTAT_FR;
+
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR;
+
+        /* Characters/events to ignore */
+        pi->port.ignore_status_mask = 0;
+
+        if (termios->c_iflag & IGNPAR)
+                pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_PE
+                        | SDMA_DESC_CMDSTAT_FR;
+
+        if (termios->c_iflag & IGNBRK) {
+                pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_BR;
+
+                if (termios->c_iflag & IGNPAR)
+                        pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR;
+        }
+
+        if ((termios->c_cflag & CREAD)) {
+                if (!pi->rcv_data) {
+                        pi->rcv_data = 1;
+                        mpsc_start_rx(pi);
+                }
+        } else if (pi->rcv_data) {
+                mpsc_stop_rx(port);
+                pi->rcv_data = 0;
+        }
+
+        spin_unlock_irqrestore(&pi->port.lock, flags);
+}
+
+static const char *mpsc_type(struct uart_port *port)
+{
+        pr_debug("mpsc_type[%d]: port type: %s\n", port->line,MPSC_DRIVER_NAME);
+        return MPSC_DRIVER_NAME;
+}
+
+static int mpsc_request_port(struct uart_port *port)
+{
+        /* Should make chip/platform specific call */
+        return 0;
+}
+
+static void mpsc_release_port(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+
+        if (pi->ready) {
+                mpsc_uninit_rings(pi);
+                mpsc_free_ring_mem(pi);
+                pi->ready = 0;
+        }
+}
+
+static void mpsc_config_port(struct uart_port *port, int flags)
+{
+}
+
+static int mpsc_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        int rc = 0;
+
+        pr_debug("mpsc_verify_port[%d]: Verifying port data\n", pi->port.line);
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPSC)
+                rc = -EINVAL;
+        else if (pi->port.irq != ser->irq)
+                rc = -EINVAL;
+        else if (ser->io_type != SERIAL_IO_MEM)
+                rc = -EINVAL;
+        else if (pi->port.uartclk / 16 != ser->baud_base) /* Not sure */
+                rc = -EINVAL;
+        else if ((void *)pi->port.mapbase != ser->iomem_base)
+                rc = -EINVAL;
+        else if (pi->port.iobase != ser->port)
+                rc = -EINVAL;
+        else if (ser->hub6 != 0)
+                rc = -EINVAL;
+
+        return rc;
+}
+#ifdef CONFIG_CONSOLE_POLL
+/* Serial polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+static char poll_buf[2048];
+static int poll_ptr;
+static int poll_cnt;
+static void mpsc_put_poll_char(struct uart_port *port,
+                                                           unsigned char c);
+
+static int mpsc_get_poll_char(struct uart_port *port)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        struct mpsc_rx_desc *rxre;
+        u32     cmdstat, bytes_in, i;
+        u8      *bp;
+
+        if (!serial_polled)
+                serial_polled = 1;
+
+        pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
+
+        if (poll_cnt) {
+                poll_cnt--;
+                return poll_buf[poll_ptr++];
+        }
+        poll_ptr = 0;
+        poll_cnt = 0;
+
+        while (poll_cnt == 0) {
+                rxre = (struct mpsc_rx_desc *)(pi->rxr +
+                       (pi->rxr_posn*MPSC_RXRE_SIZE));
+                dma_cache_sync(pi->port.dev, (void *)rxre,
+                               MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        invalidate_dcache_range((ulong)rxre,
+                        (ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+                /*
+                 * Loop through Rx descriptors handling ones that have
+                 * been completed.
+                 */
+                while (poll_cnt == 0 &&
+                       !((cmdstat = be32_to_cpu(rxre->cmdstat)) &
+                         SDMA_DESC_CMDSTAT_O)){
+                        bytes_in = be16_to_cpu(rxre->bytecnt);
+                        bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
+                        dma_cache_sync(pi->port.dev, (void *) bp,
+                                       MPSC_RXBE_SIZE, DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                        if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                                invalidate_dcache_range((ulong)bp,
+                                        (ulong)bp + MPSC_RXBE_SIZE);
+#endif
+                        if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
+                         SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) &&
+                                !(cmdstat & pi->port.ignore_status_mask)) {
+                                poll_buf[poll_cnt] = *bp;
+                                poll_cnt++;
+                        } else {
+                                for (i = 0; i < bytes_in; i++) {
+                                        poll_buf[poll_cnt] = *bp++;
+                                        poll_cnt++;
+                                }
+                                pi->port.icount.rx += bytes_in;
+                        }
+                        rxre->bytecnt = cpu_to_be16(0);
+                        wmb();
+                        rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
+                                                    SDMA_DESC_CMDSTAT_EI |
+                                                    SDMA_DESC_CMDSTAT_F |
+                                                    SDMA_DESC_CMDSTAT_L);
+                        wmb();
+                        dma_cache_sync(pi->port.dev, (void *)rxre,
+                                       MPSC_RXRE_SIZE, DMA_BIDIRECTIONAL);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                        if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                                flush_dcache_range((ulong)rxre,
+                                           (ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+
+                        /* Advance to next descriptor */
+                        pi->rxr_posn = (pi->rxr_posn + 1) &
+                                (MPSC_RXR_ENTRIES - 1);
+                        rxre = (struct mpsc_rx_desc *)(pi->rxr +
+                                       (pi->rxr_posn * MPSC_RXRE_SIZE));
+                        dma_cache_sync(pi->port.dev, (void *)rxre,
+                                       MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                        if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                                invalidate_dcache_range((ulong)rxre,
+                                                (ulong)rxre + MPSC_RXRE_SIZE);
+#endif
+                }
+
+                /* Restart rx engine, if its stopped */
+                if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
+                        mpsc_start_rx(pi);
+        }
+        if (poll_cnt) {
+                poll_cnt--;
+                return poll_buf[poll_ptr++];
+        }
+
+        return 0;
+}
+
+
+static void mpsc_put_poll_char(struct uart_port *port,
+                         unsigned char c)
+{
+        struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
+        u32 data;
+
+        data = readl(pi->mpsc_base + MPSC_MPCR);
+        writeb(c, pi->mpsc_base + MPSC_CHR_1);
+        mb();
+        data = readl(pi->mpsc_base + MPSC_CHR_2);
+        data |= MPSC_CHR_2_TTCS;
+        writel(data, pi->mpsc_base + MPSC_CHR_2);
+        mb();
+
+        while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_TTCS);
+}
+#endif
+
+static struct uart_ops mpsc_pops = {
+        .tx_empty       = mpsc_tx_empty,
+        .set_mctrl      = mpsc_set_mctrl,
+        .get_mctrl      = mpsc_get_mctrl,
+        .stop_tx        = mpsc_stop_tx,
+        .start_tx       = mpsc_start_tx,
+        .stop_rx        = mpsc_stop_rx,
+        .enable_ms      = mpsc_enable_ms,
+        .break_ctl      = mpsc_break_ctl,
+        .startup        = mpsc_startup,
+        .shutdown       = mpsc_shutdown,
+        .set_termios    = mpsc_set_termios,
+        .type           = mpsc_type,
+        .release_port   = mpsc_release_port,
+        .request_port   = mpsc_request_port,
+        .config_port    = mpsc_config_port,
+        .verify_port    = mpsc_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char = mpsc_get_poll_char,
+        .poll_put_char = mpsc_put_poll_char,
+#endif
+};
+
+/*
+ ******************************************************************************
+ *
+ * Console Interface Routines
+ *
+ ******************************************************************************
+ */
+
+#ifdef CONFIG_SERIAL_MPSC_CONSOLE
+static void mpsc_console_write(struct console *co, const char *s, uint count)
+{
+        struct mpsc_port_info *pi = &mpsc_ports[co->index];
+        u8 *bp, *dp, add_cr = 0;
+        int i;
+        unsigned long iflags;
+
+        spin_lock_irqsave(&pi->tx_lock, iflags);
+
+        while (pi->txr_head != pi->txr_tail) {
+                while (mpsc_sdma_tx_active(pi))
+                        udelay(100);
+                mpsc_sdma_intr_ack(pi);
+                mpsc_tx_intr(pi);
+        }
+
+        while (mpsc_sdma_tx_active(pi))
+                udelay(100);
+
+        while (count > 0) {
+                bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
+
+                for (i = 0; i < MPSC_TXBE_SIZE; i++) {
+                        if (count == 0)
+                                break;
+
+                        if (add_cr) {
+                                *(dp++) = '\r';
+                                add_cr = 0;
+                        } else {
+                                *(dp++) = *s;
+
+                                if (*(s++) == '\n') { /* add '\r' after '\n' */
+                                        add_cr = 1;
+                                        count++;
+                                }
+                        }
+
+                        count--;
+                }
+
+                dma_cache_sync(pi->port.dev, (void *)bp, MPSC_TXBE_SIZE,
+                                DMA_BIDIRECTIONAL);
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+                if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
+                        flush_dcache_range((ulong)bp,
+                                        (ulong)bp + MPSC_TXBE_SIZE);
+#endif
+                mpsc_setup_tx_desc(pi, i, 0);
+                pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
+                mpsc_sdma_start_tx(pi);
+
+                while (mpsc_sdma_tx_active(pi))
+                        udelay(100);
+
+                pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1);
+        }
+
+        spin_unlock_irqrestore(&pi->tx_lock, iflags);
+}
+
+static int __init mpsc_console_setup(struct console *co, char *options)
+{
+        struct mpsc_port_info *pi;
+        int baud, bits, parity, flow;
+
+        pr_debug("mpsc_console_setup[%d]: options: %s\n", co->index, options);
+
+        if (co->index >= MPSC_NUM_CTLRS)
+                co->index = 0;
+
+        pi = &mpsc_ports[co->index];
+
+        baud = pi->default_baud;
+        bits = pi->default_bits;
+        parity = pi->default_parity;
+        flow = pi->default_flow;
+
+        if (!pi->port.ops)
+                return -ENODEV;
+
+        spin_lock_init(&pi->port.lock); /* Temporary fix--copied from 8250.c */
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&pi->port, co, baud, parity, bits, flow);
+}
+
+static struct console mpsc_console = {
+        .name   = MPSC_DEV_NAME,
+        .write  = mpsc_console_write,
+        .device = uart_console_device,
+        .setup  = mpsc_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+        .data   = &mpsc_reg,
+};
+
+static int __init mpsc_late_console_init(void)
+{
+        pr_debug("mpsc_late_console_init: Enter\n");
+
+        if (!(mpsc_console.flags & CON_ENABLED))
+                register_console(&mpsc_console);
+        return 0;
+}
+
+late_initcall(mpsc_late_console_init);
+
+#define MPSC_CONSOLE    &mpsc_console
+#else
+#define MPSC_CONSOLE    NULL
+#endif
+/*
+ ******************************************************************************
+ *
+ * Dummy Platform Driver to extract & map shared register regions
+ *
+ ******************************************************************************
+ */
+static void mpsc_resource_err(char *s)
+{
+        printk(KERN_WARNING "MPSC: Platform device resource error in %s\n", s);
+}
+
+static int mpsc_shared_map_regs(struct platform_device *pd)
+{
+        struct resource *r;
+
+        if ((r = platform_get_resource(pd, IORESOURCE_MEM,
+                                        MPSC_ROUTING_BASE_ORDER))
+                        && request_mem_region(r->start,
+                                MPSC_ROUTING_REG_BLOCK_SIZE,
+                                "mpsc_routing_regs")) {
+                mpsc_shared_regs.mpsc_routing_base = ioremap(r->start,
+                                MPSC_ROUTING_REG_BLOCK_SIZE);
+                mpsc_shared_regs.mpsc_routing_base_p = r->start;
+        } else {
+                mpsc_resource_err("MPSC routing base");
+                return -ENOMEM;
+        }
+
+        if ((r = platform_get_resource(pd, IORESOURCE_MEM,
+                                        MPSC_SDMA_INTR_BASE_ORDER))
+                        && request_mem_region(r->start,
+                                MPSC_SDMA_INTR_REG_BLOCK_SIZE,
+                                "sdma_intr_regs")) {
+                mpsc_shared_regs.sdma_intr_base = ioremap(r->start,
+                        MPSC_SDMA_INTR_REG_BLOCK_SIZE);
+                mpsc_shared_regs.sdma_intr_base_p = r->start;
+        } else {
+                iounmap(mpsc_shared_regs.mpsc_routing_base);
+                release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
+                                MPSC_ROUTING_REG_BLOCK_SIZE);
+                mpsc_resource_err("SDMA intr base");
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+static void mpsc_shared_unmap_regs(void)
+{
+        if (!mpsc_shared_regs.mpsc_routing_base) {
+                iounmap(mpsc_shared_regs.mpsc_routing_base);
+                release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
+                                MPSC_ROUTING_REG_BLOCK_SIZE);
+        }
+        if (!mpsc_shared_regs.sdma_intr_base) {
+                iounmap(mpsc_shared_regs.sdma_intr_base);
+                release_mem_region(mpsc_shared_regs.sdma_intr_base_p,
+                                MPSC_SDMA_INTR_REG_BLOCK_SIZE);
+        }
+
+        mpsc_shared_regs.mpsc_routing_base = NULL;
+        mpsc_shared_regs.sdma_intr_base = NULL;
+
+        mpsc_shared_regs.mpsc_routing_base_p = 0;
+        mpsc_shared_regs.sdma_intr_base_p = 0;
+}
+
+static int mpsc_shared_drv_probe(struct platform_device *dev)
+{
+        struct mpsc_shared_pdata        *pdata;
+        int                              rc = -ENODEV;
+
+        if (dev->id == 0) {
+                if (!(rc = mpsc_shared_map_regs(dev))) {
+                        pdata = (struct mpsc_shared_pdata *)
+                                dev->dev.platform_data;
+
+                        mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val;
+                        mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val;
+                        mpsc_shared_regs.MPSC_TCRR_m= pdata->tcrr_val;
+                        mpsc_shared_regs.SDMA_INTR_CAUSE_m =
+                                pdata->intr_cause_val;
+                        mpsc_shared_regs.SDMA_INTR_MASK_m =
+                                pdata->intr_mask_val;
+
+                        rc = 0;
+                }
+        }
+
+        return rc;
+}
+
+static int mpsc_shared_drv_remove(struct platform_device *dev)
+{
+        int     rc = -ENODEV;
+
+        if (dev->id == 0) {
+                mpsc_shared_unmap_regs();
+                mpsc_shared_regs.MPSC_MRR_m = 0;
+                mpsc_shared_regs.MPSC_RCRR_m = 0;
+                mpsc_shared_regs.MPSC_TCRR_m = 0;
+                mpsc_shared_regs.SDMA_INTR_CAUSE_m = 0;
+                mpsc_shared_regs.SDMA_INTR_MASK_m = 0;
+                rc = 0;
+        }
+
+        return rc;
+}
+
+static struct platform_driver mpsc_shared_driver = {
+        .probe  = mpsc_shared_drv_probe,
+        .remove = mpsc_shared_drv_remove,
+        .driver = {
+                .name   = MPSC_SHARED_NAME,
+        },
+};
+
+/*
+ ******************************************************************************
+ *
+ * Driver Interface Routines
+ *
+ ******************************************************************************
+ */
+static struct uart_driver mpsc_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = MPSC_DRIVER_NAME,
+        .dev_name       = MPSC_DEV_NAME,
+        .major          = MPSC_MAJOR,
+        .minor          = MPSC_MINOR_START,
+        .nr             = MPSC_NUM_CTLRS,
+        .cons           = MPSC_CONSOLE,
+};
+
+static int mpsc_drv_map_regs(struct mpsc_port_info *pi,
+                struct platform_device *pd)
+{
+        struct resource *r;
+
+        if ((r = platform_get_resource(pd, IORESOURCE_MEM, MPSC_BASE_ORDER))
+                        && request_mem_region(r->start, MPSC_REG_BLOCK_SIZE,
+                        "mpsc_regs")) {
+                pi->mpsc_base = ioremap(r->start, MPSC_REG_BLOCK_SIZE);
+                pi->mpsc_base_p = r->start;
+        } else {
+                mpsc_resource_err("MPSC base");
+                goto err;
+        }
+
+        if ((r = platform_get_resource(pd, IORESOURCE_MEM,
+                                        MPSC_SDMA_BASE_ORDER))
+                        && request_mem_region(r->start,
+                                MPSC_SDMA_REG_BLOCK_SIZE, "sdma_regs")) {
+                pi->sdma_base = ioremap(r->start,MPSC_SDMA_REG_BLOCK_SIZE);
+                pi->sdma_base_p = r->start;
+        } else {
+                mpsc_resource_err("SDMA base");
+                if (pi->mpsc_base) {
+                        iounmap(pi->mpsc_base);
+                        pi->mpsc_base = NULL;
+                }
+                goto err;
+        }
+
+        if ((r = platform_get_resource(pd,IORESOURCE_MEM,MPSC_BRG_BASE_ORDER))
+                        && request_mem_region(r->start,
+                                MPSC_BRG_REG_BLOCK_SIZE, "brg_regs")) {
+                pi->brg_base = ioremap(r->start, MPSC_BRG_REG_BLOCK_SIZE);
+                pi->brg_base_p = r->start;
+        } else {
+                mpsc_resource_err("BRG base");
+                if (pi->mpsc_base) {
+                        iounmap(pi->mpsc_base);
+                        pi->mpsc_base = NULL;
+                }
+                if (pi->sdma_base) {
+                        iounmap(pi->sdma_base);
+                        pi->sdma_base = NULL;
+                }
+                goto err;
+        }
+        return 0;
+
+err:
+        return -ENOMEM;
+}
+
+static void mpsc_drv_unmap_regs(struct mpsc_port_info *pi)
+{
+        if (!pi->mpsc_base) {
+                iounmap(pi->mpsc_base);
+                release_mem_region(pi->mpsc_base_p, MPSC_REG_BLOCK_SIZE);
+        }
+        if (!pi->sdma_base) {
+                iounmap(pi->sdma_base);
+                release_mem_region(pi->sdma_base_p, MPSC_SDMA_REG_BLOCK_SIZE);
+        }
+        if (!pi->brg_base) {
+                iounmap(pi->brg_base);
+                release_mem_region(pi->brg_base_p, MPSC_BRG_REG_BLOCK_SIZE);
+        }
+
+        pi->mpsc_base = NULL;
+        pi->sdma_base = NULL;
+        pi->brg_base = NULL;
+
+        pi->mpsc_base_p = 0;
+        pi->sdma_base_p = 0;
+        pi->brg_base_p = 0;
+}
+
+static void mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
+                struct platform_device *pd, int num)
+{
+        struct mpsc_pdata       *pdata;
+
+        pdata = (struct mpsc_pdata *)pd->dev.platform_data;
+
+        pi->port.uartclk = pdata->brg_clk_freq;
+        pi->port.iotype = UPIO_MEM;
+        pi->port.line = num;
+        pi->port.type = PORT_MPSC;
+        pi->port.fifosize = MPSC_TXBE_SIZE;
+        pi->port.membase = pi->mpsc_base;
+        pi->port.mapbase = (ulong)pi->mpsc_base;
+        pi->port.ops = &mpsc_pops;
+
+        pi->mirror_regs = pdata->mirror_regs;
+        pi->cache_mgmt = pdata->cache_mgmt;
+        pi->brg_can_tune = pdata->brg_can_tune;
+        pi->brg_clk_src = pdata->brg_clk_src;
+        pi->mpsc_max_idle = pdata->max_idle;
+        pi->default_baud = pdata->default_baud;
+        pi->default_bits = pdata->default_bits;
+        pi->default_parity = pdata->default_parity;
+        pi->default_flow = pdata->default_flow;
+
+        /* Initial values of mirrored regs */
+        pi->MPSC_CHR_1_m = pdata->chr_1_val;
+        pi->MPSC_CHR_2_m = pdata->chr_2_val;
+        pi->MPSC_CHR_10_m = pdata->chr_10_val;
+        pi->MPSC_MPCR_m = pdata->mpcr_val;
+        pi->BRG_BCR_m = pdata->bcr_val;
+
+        pi->shared_regs = &mpsc_shared_regs;
+
+        pi->port.irq = platform_get_irq(pd, 0);
+}
+
+static int mpsc_drv_probe(struct platform_device *dev)
+{
+        struct mpsc_port_info   *pi;
+        int                     rc = -ENODEV;
+
+        pr_debug("mpsc_drv_probe: Adding MPSC %d\n", dev->id);
+
+        if (dev->id < MPSC_NUM_CTLRS) {
+                pi = &mpsc_ports[dev->id];
+
+                if (!(rc = mpsc_drv_map_regs(pi, dev))) {
+                        mpsc_drv_get_platform_data(pi, dev, dev->id);
+                        pi->port.dev = &dev->dev;
+
+                        if (!(rc = mpsc_make_ready(pi))) {
+                                spin_lock_init(&pi->tx_lock);
+                                if (!(rc = uart_add_one_port(&mpsc_reg,
+                                                                &pi->port))) {
+                                        rc = 0;
+                                } else {
+                                        mpsc_release_port((struct uart_port *)
+                                                        pi);
+                                        mpsc_drv_unmap_regs(pi);
+                                }
+                        } else {
+                                mpsc_drv_unmap_regs(pi);
+                        }
+                }
+        }
+
+        return rc;
+}
+
+static int mpsc_drv_remove(struct platform_device *dev)
+{
+        pr_debug("mpsc_drv_exit: Removing MPSC %d\n", dev->id);
+
+        if (dev->id < MPSC_NUM_CTLRS) {
+                uart_remove_one_port(&mpsc_reg, &mpsc_ports[dev->id].port);
+                mpsc_release_port((struct uart_port *)
+                                &mpsc_ports[dev->id].port);
+                mpsc_drv_unmap_regs(&mpsc_ports[dev->id]);
+                return 0;
+        } else {
+                return -ENODEV;
+        }
+}
+
+static struct platform_driver mpsc_driver = {
+        .probe  = mpsc_drv_probe,
+        .remove = mpsc_drv_remove,
+        .driver = {
+                .name   = MPSC_CTLR_NAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init mpsc_drv_init(void)
+{
+        int     rc;
+
+        printk(KERN_INFO "Serial: MPSC driver\n");
+
+        memset(mpsc_ports, 0, sizeof(mpsc_ports));
+        memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
+
+        if (!(rc = uart_register_driver(&mpsc_reg))) {
+                if (!(rc = platform_driver_register(&mpsc_shared_driver))) {
+                        if ((rc = platform_driver_register(&mpsc_driver))) {
+                                platform_driver_unregister(&mpsc_shared_driver);
+                                uart_unregister_driver(&mpsc_reg);
+                        }
+                } else {
+                        uart_unregister_driver(&mpsc_reg);
+                }
+        }
+
+        return rc;
+}
+
+static void __exit mpsc_drv_exit(void)
+{
+        platform_driver_unregister(&mpsc_driver);
+        platform_driver_unregister(&mpsc_shared_driver);
+        uart_unregister_driver(&mpsc_reg);
+        memset(mpsc_ports, 0, sizeof(mpsc_ports));
+        memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
+}
+
+module_init(mpsc_drv_init);
+module_exit(mpsc_drv_exit);
+
+MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
+MODULE_DESCRIPTION("Generic Marvell MPSC serial/UART driver");
+MODULE_VERSION(MPSC_VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(MPSC_MAJOR);
+MODULE_ALIAS("platform:" MPSC_CTLR_NAME);
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
new file mode 100644
index 000000000000..a764bf99743b
--- /dev/null
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -0,0 +1,920 @@
+/*
+ *  mrst_max3110.c - spi uart protocol driver for Maxim 3110
+ *
+ * Copyright (c) 2008-2010, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*
+ * Note:
+ * 1. From Max3110 spec, the Rx FIFO has 8 words, while the Tx FIFO only has
+ *    1 word. If SPI master controller doesn't support sclk frequency change,
+ *    then the char need be sent out one by one with some delay
+ *
+ * 2. Currently only RX available interrrupt is used, no need for waiting TXE
+ *    interrupt for a low speed UART device
+ */
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+
+#include <linux/kthread.h>
+#include <linux/spi/spi.h>
+
+#include "mrst_max3110.h"
+
+#define PR_FMT  "mrst_max3110: "
+
+#define UART_TX_NEEDED 1
+#define CON_TX_NEEDED  2
+#define BIT_IRQ_PENDING    3
+
+struct uart_max3110 {
+        struct uart_port port;
+        struct spi_device *spi;
+        char name[SPI_NAME_SIZE];
+
+        wait_queue_head_t wq;
+        struct task_struct *main_thread;
+        struct task_struct *read_thread;
+        struct mutex thread_mutex;
+
+        u32 baud;
+        u16 cur_conf;
+        u8 clock;
+        u8 parity, word_7bits;
+        u16 irq;
+
+        unsigned long uart_flags;
+
+        /* console related */
+        struct circ_buf con_xmit;
+};
+
+/* global data structure, may need be removed */
+static struct uart_max3110 *pmax;
+
+static void receive_chars(struct uart_max3110 *max,
+                                unsigned char *str, int len);
+static int max3110_read_multi(struct uart_max3110 *max, u8 *buf);
+static void max3110_con_receive(struct uart_max3110 *max);
+
+static int max3110_write_then_read(struct uart_max3110 *max,
+                const void *txbuf, void *rxbuf, unsigned len, int always_fast)
+{
+        struct spi_device *spi = max->spi;
+        struct spi_message      message;
+        struct spi_transfer     x;
+        int ret;
+
+        spi_message_init(&message);
+        memset(&x, 0, sizeof x);
+        x.len = len;
+        x.tx_buf = txbuf;
+        x.rx_buf = rxbuf;
+        spi_message_add_tail(&x, &message);
+
+        if (always_fast)
+                x.speed_hz = spi->max_speed_hz;
+        else if (max->baud)
+                x.speed_hz = max->baud;
+
+        /* Do the i/o */
+        ret = spi_sync(spi, &message);
+        return ret;
+}
+
+/* Write a 16b word to the device */
+static int max3110_out(struct uart_max3110 *max, const u16 out)
+{
+        void *buf;
+        u16 *obuf, *ibuf;
+        u8  ch;
+        int ret;
+
+        buf = kzalloc(8, GFP_KERNEL | GFP_DMA);
+        if (!buf)
+                return -ENOMEM;
+
+        obuf = buf;
+        ibuf = buf + 4;
+        *obuf = out;
+        ret = max3110_write_then_read(max, obuf, ibuf, 2, 1);
+        if (ret) {
+                pr_warning(PR_FMT "%s(): get err msg %d when sending 0x%x\n",
+                                __func__, ret, out);
+                goto exit;
+        }
+
+        /* If some valid data is read back */
+        if (*ibuf & MAX3110_READ_DATA_AVAILABLE) {
+                ch = *ibuf & 0xff;
+                receive_chars(max, &ch, 1);
+        }
+
+exit:
+        kfree(buf);
+        return ret;
+}
+
+/*
+ * This is usually used to read data from SPIC RX FIFO, which doesn't
+ * need any delay like flushing character out.
+ *
+ * Return how many valide bytes are read back
+ */
+static int max3110_read_multi(struct uart_max3110 *max, u8 *rxbuf)
+{
+        void *buf;
+        u16 *obuf, *ibuf;
+        u8 *pbuf, valid_str[M3110_RX_FIFO_DEPTH];
+        int i, j, blen;
+
+        blen = M3110_RX_FIFO_DEPTH * sizeof(u16);
+        buf = kzalloc(blen * 2, GFP_KERNEL | GFP_DMA);
+        if (!buf) {
+                pr_warning(PR_FMT "%s(): fail to alloc dma buffer\n", __func__);
+                return 0;
+        }
+
+        /* tx/rx always have the same length */
+        obuf = buf;
+        ibuf = buf + blen;
+
+        if (max3110_write_then_read(max, obuf, ibuf, blen, 1)) {
+                kfree(buf);
+                return 0;
+        }
+
+        /* If caller doesn't provide a buffer, then handle received char */
+        pbuf = rxbuf ? rxbuf : valid_str;
+
+        for (i = 0, j = 0; i < M3110_RX_FIFO_DEPTH; i++) {
+                if (ibuf[i] & MAX3110_READ_DATA_AVAILABLE)
+                        pbuf[j++] = ibuf[i] & 0xff;
+        }
+
+        if (j && (pbuf == valid_str))
+                receive_chars(max, valid_str, j);
+
+        kfree(buf);
+        return j;
+}
+
+static void serial_m3110_con_putchar(struct uart_port *port, int ch)
+{
+        struct uart_max3110 *max =
+                container_of(port, struct uart_max3110, port);
+        struct circ_buf *xmit = &max->con_xmit;
+
+        if (uart_circ_chars_free(xmit)) {
+                xmit->buf[xmit->head] = (char)ch;
+                xmit->head = (xmit->head + 1) & (PAGE_SIZE - 1);
+        }
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ *
+ *      The console_lock must be held when we get here.
+ */
+static void serial_m3110_con_write(struct console *co,
+                                const char *s, unsigned int count)
+{
+        if (!pmax)
+                return;
+
+        uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar);
+
+        if (!test_and_set_bit(CON_TX_NEEDED, &pmax->uart_flags))
+                wake_up_process(pmax->main_thread);
+}
+
+static int __init
+serial_m3110_con_setup(struct console *co, char *options)
+{
+        struct uart_max3110 *max = pmax;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        pr_info(PR_FMT "setting up console\n");
+
+        if (co->index == -1)
+                co->index = 0;
+
+        if (!max) {
+                pr_err(PR_FMT "pmax is NULL, return");
+                return -ENODEV;
+        }
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&max->port, co, baud, parity, bits, flow);
+}
+
+static struct tty_driver *serial_m3110_con_device(struct console *co,
+                                                        int *index)
+{
+        struct uart_driver *p = co->data;
+        *index = co->index;
+        return p->tty_driver;
+}
+
+static struct uart_driver serial_m3110_reg;
+static struct console serial_m3110_console = {
+        .name           = "ttyS",
+        .write          = serial_m3110_con_write,
+        .device         = serial_m3110_con_device,
+        .setup          = serial_m3110_con_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &serial_m3110_reg,
+};
+
+static unsigned int serial_m3110_tx_empty(struct uart_port *port)
+{
+        return 1;
+}
+
+static void serial_m3110_stop_tx(struct uart_port *port)
+{
+        return;
+}
+
+/* stop_rx will be called in spin_lock env */
+static void serial_m3110_stop_rx(struct uart_port *port)
+{
+        return;
+}
+
+#define WORDS_PER_XFER  128
+static void send_circ_buf(struct uart_max3110 *max,
+                                struct circ_buf *xmit)
+{
+        void *buf;
+        u16 *obuf, *ibuf;
+        u8 valid_str[WORDS_PER_XFER];
+        int i, j, len, blen, dma_size, left, ret = 0;
+
+
+        dma_size = WORDS_PER_XFER * sizeof(u16) * 2;
+        buf = kzalloc(dma_size, GFP_KERNEL | GFP_DMA);
+        if (!buf)
+                return;
+        obuf = buf;
+        ibuf = buf + dma_size/2;
+
+        while (!uart_circ_empty(xmit)) {
+                left = uart_circ_chars_pending(xmit);
+                while (left) {
+                        len = min(left, WORDS_PER_XFER);
+                        blen = len * sizeof(u16);
+                        memset(ibuf, 0, blen);
+
+                        for (i = 0; i < len; i++) {
+                                obuf[i] = (u8)xmit->buf[xmit->tail] | WD_TAG;
+                                xmit->tail = (xmit->tail + 1) &
+                                                (UART_XMIT_SIZE - 1);
+                        }
+
+                        /* Fail to send msg to console is not very critical */
+                        ret = max3110_write_then_read(max, obuf, ibuf, blen, 0);
+                        if (ret)
+                                pr_warning(PR_FMT "%s(): get err msg %d\n",
+                                                __func__, ret);
+
+                        for (i = 0, j = 0; i < len; i++) {
+                                if (ibuf[i] & MAX3110_READ_DATA_AVAILABLE)
+                                        valid_str[j++] = ibuf[i] & 0xff;
+                        }
+
+                        if (j)
+                                receive_chars(max, valid_str, j);
+
+                        max->port.icount.tx += len;
+                        left -= len;
+                }
+        }
+
+        kfree(buf);
+}
+
+static void transmit_char(struct uart_max3110 *max)
+{
+        struct uart_port *port = &max->port;
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+                return;
+
+        send_circ_buf(max, xmit);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                serial_m3110_stop_tx(port);
+}
+
+/*
+ * This will be called by uart_write() and tty_write, can't
+ * go to sleep
+ */
+static void serial_m3110_start_tx(struct uart_port *port)
+{
+        struct uart_max3110 *max =
+                container_of(port, struct uart_max3110, port);
+
+        if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags))
+                wake_up_process(max->main_thread);
+}
+
+static void receive_chars(struct uart_max3110 *max, unsigned char *str, int len)
+{
+        struct uart_port *port = &max->port;
+        struct tty_struct *tty;
+        int usable;
+
+        /* If uart is not opened, just return */
+        if (!port->state)
+                return;
+
+        tty = port->state->port.tty;
+        if (!tty)
+                return;
+
+        while (len) {
+                usable = tty_buffer_request_room(tty, len);
+                if (usable) {
+                        tty_insert_flip_string(tty, str, usable);
+                        str += usable;
+                        port->icount.rx += usable;
+                }
+                len -= usable;
+        }
+        tty_flip_buffer_push(tty);
+}
+
+/*
+ * This routine will be used in read_thread or RX IRQ handling,
+ * it will first do one round buffer read(8 words), if there is some
+ * valid RX data, will try to read 5 more rounds till all data
+ * is read out.
+ *
+ * Use stack space as data buffer to save some system load, and chose
+ * 504 Btyes as a threadhold to do a bulk push to upper tty layer when
+ * receiving bulk data, a much bigger buffer may cause stack overflow
+ */
+static void max3110_con_receive(struct uart_max3110 *max)
+{
+        int loop = 1, num, total = 0;
+        u8 recv_buf[512], *pbuf;
+
+        pbuf = recv_buf;
+        do {
+                num = max3110_read_multi(max, pbuf);
+
+                if (num) {
+                        loop = 5;
+                        pbuf += num;
+                        total += num;
+
+                        if (total >= 504) {
+                                receive_chars(max, recv_buf, total);
+                                pbuf = recv_buf;
+                                total = 0;
+                        }
+                }
+        } while (--loop);
+
+        if (total)
+                receive_chars(max, recv_buf, total);
+}
+
+static int max3110_main_thread(void *_max)
+{
+        struct uart_max3110 *max = _max;
+        wait_queue_head_t *wq = &max->wq;
+        int ret = 0;
+        struct circ_buf *xmit = &max->con_xmit;
+
+        pr_info(PR_FMT "start main thread\n");
+
+        do {
+                wait_event_interruptible(*wq, max->uart_flags || kthread_should_stop());
+
+                mutex_lock(&max->thread_mutex);
+
+                if (test_and_clear_bit(BIT_IRQ_PENDING, &max->uart_flags))
+                        max3110_con_receive(max);
+
+                /* first handle console output */
+                if (test_and_clear_bit(CON_TX_NEEDED, &max->uart_flags))
+                        send_circ_buf(max, xmit);
+
+                /* handle uart output */
+                if (test_and_clear_bit(UART_TX_NEEDED, &max->uart_flags))
+                        transmit_char(max);
+
+                mutex_unlock(&max->thread_mutex);
+
+        } while (!kthread_should_stop());
+
+        return ret;
+}
+
+static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
+{
+        struct uart_max3110 *max = dev_id;
+
+        /* max3110's irq is a falling edge, not level triggered,
+         * so no need to disable the irq */
+        if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags))
+                wake_up_process(max->main_thread);
+
+        return IRQ_HANDLED;
+}
+
+/* if don't use RX IRQ, then need a thread to polling read */
+static int max3110_read_thread(void *_max)
+{
+        struct uart_max3110 *max = _max;
+
+        pr_info(PR_FMT "start read thread\n");
+        do {
+                /*
+                 * If can't acquire the mutex, it means the main thread
+                 * is running which will also perform the rx job
+                 */
+                if (mutex_trylock(&max->thread_mutex)) {
+                        max3110_con_receive(max);
+                        mutex_unlock(&max->thread_mutex);
+                }
+
+                set_current_state(TASK_INTERRUPTIBLE);
+                schedule_timeout(HZ / 20);
+        } while (!kthread_should_stop());
+
+        return 0;
+}
+
+static int serial_m3110_startup(struct uart_port *port)
+{
+        struct uart_max3110 *max =
+                container_of(port, struct uart_max3110, port);
+        u16 config = 0;
+        int ret = 0;
+
+        if (port->line != 0) {
+                pr_err(PR_FMT "uart port startup failed\n");
+                return -1;
+        }
+
+        /* Disable all IRQ and config it to 115200, 8n1 */
+        config = WC_TAG | WC_FIFO_ENABLE
+                        | WC_1_STOPBITS
+                        | WC_8BIT_WORD
+                        | WC_BAUD_DR2;
+
+        /* as we use thread to handle tx/rx, need set low latency */
+        port->state->port.tty->low_latency = 1;
+
+        if (max->irq) {
+                max->read_thread = NULL;
+                ret = request_irq(max->irq, serial_m3110_irq,
+                                IRQ_TYPE_EDGE_FALLING, "max3110", max);
+                if (ret) {
+                        max->irq = 0;
+                        pr_err(PR_FMT "unable to allocate IRQ, polling\n");
+                }  else {
+                        /* Enable RX IRQ only */
+                        config |= WC_RXA_IRQ_ENABLE;
+                }
+        }
+
+        if (max->irq == 0) {
+                /* If IRQ is disabled, start a read thread for input data */
+                max->read_thread =
+                        kthread_run(max3110_read_thread, max, "max3110_read");
+                if (IS_ERR(max->read_thread)) {
+                        ret = PTR_ERR(max->read_thread);
+                        max->read_thread = NULL;
+                        pr_err(PR_FMT "Can't create read thread!\n");
+                        return ret;
+                }
+        }
+
+        ret = max3110_out(max, config);
+        if (ret) {
+                if (max->irq)
+                        free_irq(max->irq, max);
+                if (max->read_thread)
+                        kthread_stop(max->read_thread);
+                max->read_thread = NULL;
+                return ret;
+        }
+
+        max->cur_conf = config;
+        return 0;
+}
+
+static void serial_m3110_shutdown(struct uart_port *port)
+{
+        struct uart_max3110 *max =
+                container_of(port, struct uart_max3110, port);
+        u16 config;
+
+        if (max->read_thread) {
+                kthread_stop(max->read_thread);
+                max->read_thread = NULL;
+        }
+
+        if (max->irq)
+                free_irq(max->irq, max);
+
+        /* Disable interrupts from this port */
+        config = WC_TAG | WC_SW_SHDI;
+        max3110_out(max, config);
+}
+
+static void serial_m3110_release_port(struct uart_port *port)
+{
+}
+
+static int serial_m3110_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void serial_m3110_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_MAX3100;
+}
+
+static int
+serial_m3110_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        /* we don't want the core code to modify any port params */
+        return -EINVAL;
+}
+
+
+static const char *serial_m3110_type(struct uart_port *port)
+{
+        struct uart_max3110 *max =
+                container_of(port, struct uart_max3110, port);
+        return max->name;
+}
+
+static void
+serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios,
+                       struct ktermios *old)
+{
+        struct uart_max3110 *max =
+                container_of(port, struct uart_max3110, port);
+        unsigned char cval;
+        unsigned int baud, parity = 0;
+        int clk_div = -1;
+        u16 new_conf = max->cur_conf;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS7:
+                cval = UART_LCR_WLEN7;
+                new_conf |= WC_7BIT_WORD;
+                break;
+        default:
+                /* We only support CS7 & CS8 */
+                termios->c_cflag &= ~CSIZE;
+                termios->c_cflag |= CS8;
+        case CS8:
+                cval = UART_LCR_WLEN8;
+                new_conf |= WC_8BIT_WORD;
+                break;
+        }
+
+        baud = uart_get_baud_rate(port, termios, old, 0, 230400);
+
+        /* First calc the div for 1.8MHZ clock case */
+        switch (baud) {
+        case 300:
+                clk_div = WC_BAUD_DR384;
+                break;
+        case 600:
+                clk_div = WC_BAUD_DR192;
+                break;
+        case 1200:
+                clk_div = WC_BAUD_DR96;
+                break;
+        case 2400:
+                clk_div = WC_BAUD_DR48;
+                break;
+        case 4800:
+                clk_div = WC_BAUD_DR24;
+                break;
+        case 9600:
+                clk_div = WC_BAUD_DR12;
+                break;
+        case 19200:
+                clk_div = WC_BAUD_DR6;
+                break;
+        case 38400:
+                clk_div = WC_BAUD_DR3;
+                break;
+        case 57600:
+                clk_div = WC_BAUD_DR2;
+                break;
+        case 115200:
+                clk_div = WC_BAUD_DR1;
+                break;
+        case 230400:
+                if (max->clock & MAX3110_HIGH_CLK)
+                        break;
+        default:
+                /* Pick the previous baud rate */
+                baud = max->baud;
+                clk_div = max->cur_conf & WC_BAUD_DIV_MASK;
+                tty_termios_encode_baud_rate(termios, baud, baud);
+        }
+
+        if (max->clock & MAX3110_HIGH_CLK) {
+                clk_div += 1;
+                /* High clk version max3110 doesn't support B300 */
+                if (baud == 300) {
+                        baud = 600;
+                        clk_div = WC_BAUD_DR384;
+                }
+                if (baud == 230400)
+                        clk_div = WC_BAUD_DR1;
+                tty_termios_encode_baud_rate(termios, baud, baud);
+        }
+
+        new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div;
+
+        if (unlikely(termios->c_cflag & CMSPAR))
+                termios->c_cflag &= ~CMSPAR;
+
+        if (termios->c_cflag & CSTOPB)
+                new_conf |= WC_2_STOPBITS;
+        else
+                new_conf &= ~WC_2_STOPBITS;
+
+        if (termios->c_cflag & PARENB) {
+                new_conf |= WC_PARITY_ENABLE;
+                parity |= UART_LCR_PARITY;
+        } else
+                new_conf &= ~WC_PARITY_ENABLE;
+
+        if (!(termios->c_cflag & PARODD))
+                parity |= UART_LCR_EPAR;
+        max->parity = parity;
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        new_conf |= WC_TAG;
+        if (new_conf != max->cur_conf) {
+                if (!max3110_out(max, new_conf)) {
+                        max->cur_conf = new_conf;
+                        max->baud = baud;
+                }
+        }
+}
+
+/* Don't handle hw handshaking */
+static unsigned int serial_m3110_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_DSR | TIOCM_CAR | TIOCM_DSR;
+}
+
+static void serial_m3110_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static void serial_m3110_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+static void serial_m3110_pm(struct uart_port *port, unsigned int state,
+                        unsigned int oldstate)
+{
+}
+
+static void serial_m3110_enable_ms(struct uart_port *port)
+{
+}
+
+struct uart_ops serial_m3110_ops = {
+        .tx_empty       = serial_m3110_tx_empty,
+        .set_mctrl      = serial_m3110_set_mctrl,
+        .get_mctrl      = serial_m3110_get_mctrl,
+        .stop_tx        = serial_m3110_stop_tx,
+        .start_tx       = serial_m3110_start_tx,
+        .stop_rx        = serial_m3110_stop_rx,
+        .enable_ms      = serial_m3110_enable_ms,
+        .break_ctl      = serial_m3110_break_ctl,
+        .startup        = serial_m3110_startup,
+        .shutdown       = serial_m3110_shutdown,
+        .set_termios    = serial_m3110_set_termios,
+        .pm             = serial_m3110_pm,
+        .type           = serial_m3110_type,
+        .release_port   = serial_m3110_release_port,
+        .request_port   = serial_m3110_request_port,
+        .config_port    = serial_m3110_config_port,
+        .verify_port    = serial_m3110_verify_port,
+};
+
+static struct uart_driver serial_m3110_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "MRST serial",
+        .dev_name       = "ttyS",
+        .major          = TTY_MAJOR,
+        .minor          = 64,
+        .nr             = 1,
+        .cons           = &serial_m3110_console,
+};
+
+#ifdef CONFIG_PM
+static int serial_m3110_suspend(struct spi_device *spi, pm_message_t state)
+{
+        struct uart_max3110 *max = spi_get_drvdata(spi);
+
+        disable_irq(max->irq);
+        uart_suspend_port(&serial_m3110_reg, &max->port);
+        max3110_out(max, max->cur_conf | WC_SW_SHDI);
+        return 0;
+}
+
+static int serial_m3110_resume(struct spi_device *spi)
+{
+        struct uart_max3110 *max = spi_get_drvdata(spi);
+
+        max3110_out(max, max->cur_conf);
+        uart_resume_port(&serial_m3110_reg, &max->port);
+        enable_irq(max->irq);
+        return 0;
+}
+#else
+#define serial_m3110_suspend    NULL
+#define serial_m3110_resume     NULL
+#endif
+
+static int __devinit serial_m3110_probe(struct spi_device *spi)
+{
+        struct uart_max3110 *max;
+        void *buffer;
+        u16 res;
+        int ret = 0;
+
+        max = kzalloc(sizeof(*max), GFP_KERNEL);
+        if (!max)
+                return -ENOMEM;
+
+        /* Set spi info */
+        spi->bits_per_word = 16;
+        max->clock = MAX3110_HIGH_CLK;
+
+        spi_setup(spi);
+
+        max->port.type = PORT_MAX3100;
+        max->port.fifosize = 2;         /* Only have 16b buffer */
+        max->port.ops = &serial_m3110_ops;
+        max->port.line = 0;
+        max->port.dev = &spi->dev;
+        max->port.uartclk = 115200;
+
+        max->spi = spi;
+        strcpy(max->name, spi->modalias);
+        max->irq = (u16)spi->irq;
+
+        mutex_init(&max->thread_mutex);
+
+        max->word_7bits = 0;
+        max->parity = 0;
+        max->baud = 0;
+
+        max->cur_conf = 0;
+        max->uart_flags = 0;
+
+        /* Check if reading configuration register returns something sane */
+
+        res = RC_TAG;
+        ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0);
+        if (ret < 0 || res == 0 || res == 0xffff) {
+                dev_dbg(&spi->dev, "MAX3111 deemed not present (conf reg %04x)",
+                                                                        res);
+                ret = -ENODEV;
+                goto err_get_page;
+        }
+
+        buffer = (void *)__get_free_page(GFP_KERNEL);
+        if (!buffer) {
+                ret = -ENOMEM;
+                goto err_get_page;
+        }
+        max->con_xmit.buf = buffer;
+        max->con_xmit.head = 0;
+        max->con_xmit.tail = 0;
+
+        init_waitqueue_head(&max->wq);
+
+        max->main_thread = kthread_run(max3110_main_thread,
+                                        max, "max3110_main");
+        if (IS_ERR(max->main_thread)) {
+                ret = PTR_ERR(max->main_thread);
+                goto err_kthread;
+        }
+
+        spi_set_drvdata(spi, max);
+        pmax = max;
+
+        /* Give membase a psudo value to pass serial_core's check */
+        max->port.membase = (void *)0xff110000;
+        uart_add_one_port(&serial_m3110_reg, &max->port);
+
+        return 0;
+
+err_kthread:
+        free_page((unsigned long)buffer);
+err_get_page:
+        kfree(max);
+        return ret;
+}
+
+static int __devexit serial_m3110_remove(struct spi_device *dev)
+{
+        struct uart_max3110 *max = spi_get_drvdata(dev);
+
+        if (!max)
+                return 0;
+
+        uart_remove_one_port(&serial_m3110_reg, &max->port);
+
+        free_page((unsigned long)max->con_xmit.buf);
+
+        if (max->main_thread)
+                kthread_stop(max->main_thread);
+
+        kfree(max);
+        return 0;
+}
+
+static struct spi_driver uart_max3110_driver = {
+        .driver = {
+                        .name   = "spi_max3111",
+                        .bus    = &spi_bus_type,
+                        .owner  = THIS_MODULE,
+        },
+        .probe          = serial_m3110_probe,
+        .remove         = __devexit_p(serial_m3110_remove),
+        .suspend        = serial_m3110_suspend,
+        .resume         = serial_m3110_resume,
+};
+
+static int __init serial_m3110_init(void)
+{
+        int ret = 0;
+
+        ret = uart_register_driver(&serial_m3110_reg);
+        if (ret)
+                return ret;
+
+        ret = spi_register_driver(&uart_max3110_driver);
+        if (ret)
+                uart_unregister_driver(&serial_m3110_reg);
+
+        return ret;
+}
+
+static void __exit serial_m3110_exit(void)
+{
+        spi_unregister_driver(&uart_max3110_driver);
+        uart_unregister_driver(&serial_m3110_reg);
+}
+
+module_init(serial_m3110_init);
+module_exit(serial_m3110_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("max3110-uart");
diff --git a/drivers/tty/serial/mrst_max3110.h b/drivers/tty/serial/mrst_max3110.h
new file mode 100644
index 000000000000..c37ea48c825a
--- /dev/null
+++ b/drivers/tty/serial/mrst_max3110.h
@@ -0,0 +1,60 @@
+#ifndef _MRST_MAX3110_H
+#define _MRST_MAX3110_H
+
+#define MAX3110_HIGH_CLK        0x1     /* 3.6864 MHZ */
+#define MAX3110_LOW_CLK         0x0     /* 1.8432 MHZ */
+
+/* status bits for all 4 MAX3110 operate modes */
+#define MAX3110_READ_DATA_AVAILABLE     (1 << 15)
+#define MAX3110_WRITE_BUF_EMPTY         (1 << 14)
+
+#define WC_TAG                  (3 << 14)
+#define RC_TAG                  (1 << 14)
+#define WD_TAG                  (2 << 14)
+#define RD_TAG                  (0 << 14)
+
+/* bits def for write configuration */
+#define WC_FIFO_ENABLE_MASK     (1 << 13)
+#define WC_FIFO_ENABLE          (0 << 13)
+
+#define WC_SW_SHDI              (1 << 12)
+
+#define WC_IRQ_MASK             (0xF << 8)
+#define WC_TXE_IRQ_ENABLE       (1 << 11)       /* TX empty irq */
+#define WC_RXA_IRQ_ENABLE       (1 << 10)       /* RX available irq */
+#define WC_PAR_HIGH_IRQ_ENABLE  (1 << 9)
+#define WC_REC_ACT_IRQ_ENABLE   (1 << 8)
+
+#define WC_IRDA_ENABLE          (1 << 7)
+
+#define WC_STOPBITS_MASK        (1 << 6)
+#define WC_2_STOPBITS           (1 << 6)
+#define WC_1_STOPBITS           (0 << 6)
+
+#define WC_PARITY_ENABLE_MASK   (1 << 5)
+#define WC_PARITY_ENABLE        (1 << 5)
+
+#define WC_WORDLEN_MASK         (1 << 4)
+#define WC_7BIT_WORD            (1 << 4)
+#define WC_8BIT_WORD            (0 << 4)
+
+#define WC_BAUD_DIV_MASK        (0xF)
+#define WC_BAUD_DR1             (0x0)
+#define WC_BAUD_DR2             (0x1)
+#define WC_BAUD_DR4             (0x2)
+#define WC_BAUD_DR8             (0x3)
+#define WC_BAUD_DR16            (0x4)
+#define WC_BAUD_DR32            (0x5)
+#define WC_BAUD_DR64            (0x6)
+#define WC_BAUD_DR128           (0x7)
+#define WC_BAUD_DR3             (0x8)
+#define WC_BAUD_DR6             (0x9)
+#define WC_BAUD_DR12            (0xA)
+#define WC_BAUD_DR24            (0xB)
+#define WC_BAUD_DR48            (0xC)
+#define WC_BAUD_DR96            (0xD)
+#define WC_BAUD_DR192           (0xE)
+#define WC_BAUD_DR384           (0xF)
+
+#define M3110_RX_FIFO_DEPTH     8
+#endif
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
new file mode 100644
index 000000000000..e6ba83876508
--- /dev/null
+++ b/drivers/tty/serial/msm_serial.c
@@ -0,0 +1,966 @@
+/*
+ * Driver for msm7k serial device and console
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Robert Love <rlove@google.com>
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#if defined(CONFIG_SERIAL_MSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+# define SUPPORT_SYSRQ
+#endif
+
+#include <linux/hrtimer.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+
+#include "msm_serial.h"
+
+struct msm_port {
+        struct uart_port        uart;
+        char                    name[16];
+        struct clk              *clk;
+        struct clk              *pclk;
+        unsigned int            imr;
+        unsigned int            *gsbi_base;
+        int                     is_uartdm;
+        unsigned int            old_snap_state;
+};
+
+static inline void wait_for_xmitr(struct uart_port *port, int bits)
+{
+        if (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY))
+                while ((msm_read(port, UART_ISR) & bits) != bits)
+                        cpu_relax();
+}
+
+static void msm_stop_tx(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        msm_port->imr &= ~UART_IMR_TXLEV;
+        msm_write(port, msm_port->imr, UART_IMR);
+}
+
+static void msm_start_tx(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        msm_port->imr |= UART_IMR_TXLEV;
+        msm_write(port, msm_port->imr, UART_IMR);
+}
+
+static void msm_stop_rx(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        msm_port->imr &= ~(UART_IMR_RXLEV | UART_IMR_RXSTALE);
+        msm_write(port, msm_port->imr, UART_IMR);
+}
+
+static void msm_enable_ms(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        msm_port->imr |= UART_IMR_DELTA_CTS;
+        msm_write(port, msm_port->imr, UART_IMR);
+}
+
+static void handle_rx_dm(struct uart_port *port, unsigned int misr)
+{
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned int sr;
+        int count = 0;
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        if ((msm_read(port, UART_SR) & UART_SR_OVERRUN)) {
+                port->icount.overrun++;
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
+        }
+
+        if (misr & UART_IMR_RXSTALE) {
+                count = msm_read(port, UARTDM_RX_TOTAL_SNAP) -
+                        msm_port->old_snap_state;
+                msm_port->old_snap_state = 0;
+        } else {
+                count = 4 * (msm_read(port, UART_RFWR));
+                msm_port->old_snap_state += count;
+        }
+
+        /* TODO: Precise error reporting */
+
+        port->icount.rx += count;
+
+        while (count > 0) {
+                unsigned int c;
+
+                sr = msm_read(port, UART_SR);
+                if ((sr & UART_SR_RX_READY) == 0) {
+                        msm_port->old_snap_state -= count;
+                        break;
+                }
+                c = msm_read(port, UARTDM_RF);
+                if (sr & UART_SR_RX_BREAK) {
+                        port->icount.brk++;
+                        if (uart_handle_break(port))
+                                continue;
+                } else if (sr & UART_SR_PAR_FRAME_ERR)
+                        port->icount.frame++;
+
+                /* TODO: handle sysrq */
+                tty_insert_flip_string(tty, (char *) &c,
+                                       (count > 4) ? 4 : count);
+                count -= 4;
+        }
+
+        tty_flip_buffer_push(tty);
+        if (misr & (UART_IMR_RXSTALE))
+                msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
+        msm_write(port, 0xFFFFFF, UARTDM_DMRX);
+        msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
+}
+
+static void handle_rx(struct uart_port *port)
+{
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned int sr;
+
+        /*
+         * Handle overrun. My understanding of the hardware is that overrun
+         * is not tied to the RX buffer, so we handle the case out of band.
+         */
+        if ((msm_read(port, UART_SR) & UART_SR_OVERRUN)) {
+                port->icount.overrun++;
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
+        }
+
+        /* and now the main RX loop */
+        while ((sr = msm_read(port, UART_SR)) & UART_SR_RX_READY) {
+                unsigned int c;
+                char flag = TTY_NORMAL;
+
+                c = msm_read(port, UART_RF);
+
+                if (sr & UART_SR_RX_BREAK) {
+                        port->icount.brk++;
+                        if (uart_handle_break(port))
+                                continue;
+                } else if (sr & UART_SR_PAR_FRAME_ERR) {
+                        port->icount.frame++;
+                } else {
+                        port->icount.rx++;
+                }
+
+                /* Mask conditions we're ignorning. */
+                sr &= port->read_status_mask;
+
+                if (sr & UART_SR_RX_BREAK) {
+                        flag = TTY_BREAK;
+                } else if (sr & UART_SR_PAR_FRAME_ERR) {
+                        flag = TTY_FRAME;
+                }
+
+                if (!uart_handle_sysrq_char(port, c))
+                        tty_insert_flip_char(tty, c, flag);
+        }
+
+        tty_flip_buffer_push(tty);
+}
+
+static void reset_dm_count(struct uart_port *port)
+{
+        wait_for_xmitr(port, UART_ISR_TX_READY);
+        msm_write(port, 1, UARTDM_NCF_TX);
+}
+
+static void handle_tx(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+        struct msm_port *msm_port = UART_TO_MSM(port);
+        int sent_tx;
+
+        if (port->x_char) {
+                if (msm_port->is_uartdm)
+                        reset_dm_count(port);
+
+                msm_write(port, port->x_char,
+                          msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+                port->icount.tx++;
+                port->x_char = 0;
+        }
+
+        if (msm_port->is_uartdm)
+                reset_dm_count(port);
+
+        while (msm_read(port, UART_SR) & UART_SR_TX_READY) {
+                if (uart_circ_empty(xmit)) {
+                        /* disable tx interrupts */
+                        msm_port->imr &= ~UART_IMR_TXLEV;
+                        msm_write(port, msm_port->imr, UART_IMR);
+                        break;
+                }
+                msm_write(port, xmit->buf[xmit->tail],
+                          msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+
+                if (msm_port->is_uartdm)
+                        reset_dm_count(port);
+
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                sent_tx = 1;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+}
+
+static void handle_delta_cts(struct uart_port *port)
+{
+        msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
+        port->icount.cts++;
+        wake_up_interruptible(&port->state->port.delta_msr_wait);
+}
+
+static irqreturn_t msm_irq(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct msm_port *msm_port = UART_TO_MSM(port);
+        unsigned int misr;
+
+        spin_lock(&port->lock);
+        misr = msm_read(port, UART_MISR);
+        msm_write(port, 0, UART_IMR); /* disable interrupt */
+
+        if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE)) {
+                if (msm_port->is_uartdm)
+                        handle_rx_dm(port, misr);
+                else
+                        handle_rx(port);
+        }
+        if (misr & UART_IMR_TXLEV)
+                handle_tx(port);
+        if (misr & UART_IMR_DELTA_CTS)
+                handle_delta_cts(port);
+
+        msm_write(port, msm_port->imr, UART_IMR); /* restore interrupt */
+        spin_unlock(&port->lock);
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int msm_tx_empty(struct uart_port *port)
+{
+        return (msm_read(port, UART_SR) & UART_SR_TX_EMPTY) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int msm_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR | TIOCM_RTS;
+}
+
+
+static void msm_reset(struct uart_port *port)
+{
+        /* reset everything */
+        msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
+        msm_write(port, UART_CR_CMD_RESET_TX, UART_CR);
+        msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
+        msm_write(port, UART_CR_CMD_RESET_BREAK_INT, UART_CR);
+        msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
+        msm_write(port, UART_CR_CMD_SET_RFR, UART_CR);
+}
+
+void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        unsigned int mr;
+        mr = msm_read(port, UART_MR1);
+
+        if (!(mctrl & TIOCM_RTS)) {
+                mr &= ~UART_MR1_RX_RDY_CTL;
+                msm_write(port, mr, UART_MR1);
+                msm_write(port, UART_CR_CMD_RESET_RFR, UART_CR);
+        } else {
+                mr |= UART_MR1_RX_RDY_CTL;
+                msm_write(port, mr, UART_MR1);
+        }
+}
+
+static void msm_break_ctl(struct uart_port *port, int break_ctl)
+{
+        if (break_ctl)
+                msm_write(port, UART_CR_CMD_START_BREAK, UART_CR);
+        else
+                msm_write(port, UART_CR_CMD_STOP_BREAK, UART_CR);
+}
+
+static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
+{
+        unsigned int baud_code, rxstale, watermark;
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        switch (baud) {
+        case 300:
+                baud_code = UART_CSR_300;
+                rxstale = 1;
+                break;
+        case 600:
+                baud_code = UART_CSR_600;
+                rxstale = 1;
+                break;
+        case 1200:
+                baud_code = UART_CSR_1200;
+                rxstale = 1;
+                break;
+        case 2400:
+                baud_code = UART_CSR_2400;
+                rxstale = 1;
+                break;
+        case 4800:
+                baud_code = UART_CSR_4800;
+                rxstale = 1;
+                break;
+        case 9600:
+                baud_code = UART_CSR_9600;
+                rxstale = 2;
+                break;
+        case 14400:
+                baud_code = UART_CSR_14400;
+                rxstale = 3;
+                break;
+        case 19200:
+                baud_code = UART_CSR_19200;
+                rxstale = 4;
+                break;
+        case 28800:
+                baud_code = UART_CSR_28800;
+                rxstale = 6;
+                break;
+        case 38400:
+                baud_code = UART_CSR_38400;
+                rxstale = 8;
+                break;
+        case 57600:
+                baud_code = UART_CSR_57600;
+                rxstale = 16;
+                break;
+        case 115200:
+        default:
+                baud_code = UART_CSR_115200;
+                baud = 115200;
+                rxstale = 31;
+                break;
+        }
+
+        if (msm_port->is_uartdm)
+                msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
+
+        msm_write(port, baud_code, UART_CSR);
+
+        /* RX stale watermark */
+        watermark = UART_IPR_STALE_LSB & rxstale;
+        watermark |= UART_IPR_RXSTALE_LAST;
+        watermark |= UART_IPR_STALE_TIMEOUT_MSB & (rxstale << 2);
+        msm_write(port, watermark, UART_IPR);
+
+        /* set RX watermark */
+        watermark = (port->fifosize * 3) / 4;
+        msm_write(port, watermark, UART_RFWR);
+
+        /* set TX watermark */
+        msm_write(port, 10, UART_TFWR);
+
+        if (msm_port->is_uartdm) {
+                msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
+                msm_write(port, 0xFFFFFF, UARTDM_DMRX);
+                msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
+        }
+
+        return baud;
+}
+
+
+static void msm_init_clock(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        clk_enable(msm_port->clk);
+        if (!IS_ERR(msm_port->pclk))
+                clk_enable(msm_port->pclk);
+        msm_serial_set_mnd_regs(port);
+}
+
+static int msm_startup(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+        unsigned int data, rfr_level;
+        int ret;
+
+        snprintf(msm_port->name, sizeof(msm_port->name),
+                 "msm_serial%d", port->line);
+
+        ret = request_irq(port->irq, msm_irq, IRQF_TRIGGER_HIGH,
+                          msm_port->name, port);
+        if (unlikely(ret))
+                return ret;
+
+        msm_init_clock(port);
+
+        if (likely(port->fifosize > 12))
+                rfr_level = port->fifosize - 12;
+        else
+                rfr_level = port->fifosize;
+
+        /* set automatic RFR level */
+        data = msm_read(port, UART_MR1);
+        data &= ~UART_MR1_AUTO_RFR_LEVEL1;
+        data &= ~UART_MR1_AUTO_RFR_LEVEL0;
+        data |= UART_MR1_AUTO_RFR_LEVEL1 & (rfr_level << 2);
+        data |= UART_MR1_AUTO_RFR_LEVEL0 & rfr_level;
+        msm_write(port, data, UART_MR1);
+
+        /* make sure that RXSTALE count is non-zero */
+        data = msm_read(port, UART_IPR);
+        if (unlikely(!data)) {
+                data |= UART_IPR_RXSTALE_LAST;
+                data |= UART_IPR_STALE_LSB;
+                msm_write(port, data, UART_IPR);
+        }
+
+        data = 0;
+        if (!port->cons || (port->cons && !(port->cons->flags & CON_ENABLED))) {
+                msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
+                msm_reset(port);
+                data = UART_CR_TX_ENABLE;
+        }
+
+        data |= UART_CR_RX_ENABLE;
+        msm_write(port, data, UART_CR); /* enable TX & RX */
+
+        /* Make sure IPR is not 0 to start with*/
+        if (msm_port->is_uartdm)
+                msm_write(port, UART_IPR_STALE_LSB, UART_IPR);
+
+        /* turn on RX and CTS interrupts */
+        msm_port->imr = UART_IMR_RXLEV | UART_IMR_RXSTALE |
+                        UART_IMR_CURRENT_CTS;
+
+        if (msm_port->is_uartdm) {
+                msm_write(port, 0xFFFFFF, UARTDM_DMRX);
+                msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
+                msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
+        }
+
+        msm_write(port, msm_port->imr, UART_IMR);
+        return 0;
+}
+
+static void msm_shutdown(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        msm_port->imr = 0;
+        msm_write(port, 0, UART_IMR); /* disable interrupts */
+
+        clk_disable(msm_port->clk);
+
+        free_irq(port->irq, port);
+}
+
+static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
+                            struct ktermios *old)
+{
+        unsigned long flags;
+        unsigned int baud, mr;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* calculate and set baud rate */
+        baud = uart_get_baud_rate(port, termios, old, 300, 115200);
+        baud = msm_set_baud_rate(port, baud);
+        if (tty_termios_baud_rate(termios))
+                tty_termios_encode_baud_rate(termios, baud, baud);
+
+        /* calculate parity */
+        mr = msm_read(port, UART_MR2);
+        mr &= ~UART_MR2_PARITY_MODE;
+        if (termios->c_cflag & PARENB) {
+                if (termios->c_cflag & PARODD)
+                        mr |= UART_MR2_PARITY_MODE_ODD;
+                else if (termios->c_cflag & CMSPAR)
+                        mr |= UART_MR2_PARITY_MODE_SPACE;
+                else
+                        mr |= UART_MR2_PARITY_MODE_EVEN;
+        }
+
+        /* calculate bits per char */
+        mr &= ~UART_MR2_BITS_PER_CHAR;
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                mr |= UART_MR2_BITS_PER_CHAR_5;
+                break;
+        case CS6:
+                mr |= UART_MR2_BITS_PER_CHAR_6;
+                break;
+        case CS7:
+                mr |= UART_MR2_BITS_PER_CHAR_7;
+                break;
+        case CS8:
+        default:
+                mr |= UART_MR2_BITS_PER_CHAR_8;
+                break;
+        }
+
+        /* calculate stop bits */
+        mr &= ~(UART_MR2_STOP_BIT_LEN_ONE | UART_MR2_STOP_BIT_LEN_TWO);
+        if (termios->c_cflag & CSTOPB)
+                mr |= UART_MR2_STOP_BIT_LEN_TWO;
+        else
+                mr |= UART_MR2_STOP_BIT_LEN_ONE;
+
+        /* set parity, bits per char, and stop bit */
+        msm_write(port, mr, UART_MR2);
+
+        /* calculate and set hardware flow control */
+        mr = msm_read(port, UART_MR1);
+        mr &= ~(UART_MR1_CTS_CTL | UART_MR1_RX_RDY_CTL);
+        if (termios->c_cflag & CRTSCTS) {
+                mr |= UART_MR1_CTS_CTL;
+                mr |= UART_MR1_RX_RDY_CTL;
+        }
+        msm_write(port, mr, UART_MR1);
+
+        /* Configure status bits to ignore based on termio flags. */
+        port->read_status_mask = 0;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= UART_SR_PAR_FRAME_ERR;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= UART_SR_RX_BREAK;
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *msm_type(struct uart_port *port)
+{
+        return "MSM";
+}
+
+static void msm_release_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        struct msm_port *msm_port = UART_TO_MSM(port);
+        struct resource *uart_resource;
+        struct resource *gsbi_resource;
+        resource_size_t size;
+
+        uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (unlikely(!uart_resource))
+                return;
+        size = resource_size(uart_resource);
+
+        release_mem_region(port->mapbase, size);
+        iounmap(port->membase);
+        port->membase = NULL;
+
+        if (msm_port->gsbi_base) {
+                iowrite32(GSBI_PROTOCOL_IDLE, msm_port->gsbi_base +
+                          GSBI_CONTROL);
+
+                gsbi_resource = platform_get_resource_byname(pdev,
+                                                             IORESOURCE_MEM,
+                                                             "gsbi_resource");
+
+                if (unlikely(!gsbi_resource))
+                        return;
+
+                size = resource_size(gsbi_resource);
+                release_mem_region(gsbi_resource->start, size);
+                iounmap(msm_port->gsbi_base);
+                msm_port->gsbi_base = NULL;
+        }
+}
+
+static int msm_request_port(struct uart_port *port)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+        struct platform_device *pdev = to_platform_device(port->dev);
+        struct resource *uart_resource;
+        struct resource *gsbi_resource;
+        resource_size_t size;
+        int ret;
+
+        uart_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+                                                     "uart_resource");
+        if (unlikely(!uart_resource))
+                return -ENXIO;
+
+        size = resource_size(uart_resource);
+
+        if (!request_mem_region(port->mapbase, size, "msm_serial"))
+                return -EBUSY;
+
+        port->membase = ioremap(port->mapbase, size);
+        if (!port->membase) {
+                ret = -EBUSY;
+                goto fail_release_port;
+        }
+
+        gsbi_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+                                                     "gsbi_resource");
+        /* Is this a GSBI-based port? */
+        if (gsbi_resource) {
+                size = resource_size(gsbi_resource);
+
+                if (!request_mem_region(gsbi_resource->start, size,
+                                                 "msm_serial")) {
+                        ret = -EBUSY;
+                        goto fail_release_port;
+                }
+
+                msm_port->gsbi_base = ioremap(gsbi_resource->start, size);
+                if (!msm_port->gsbi_base) {
+                        ret = -EBUSY;
+                        goto fail_release_gsbi;
+                }
+        }
+
+        return 0;
+
+fail_release_gsbi:
+        release_mem_region(gsbi_resource->start, size);
+fail_release_port:
+        release_mem_region(port->mapbase, size);
+        return ret;
+}
+
+static void msm_config_port(struct uart_port *port, int flags)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+        int ret;
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_MSM;
+                ret = msm_request_port(port);
+                if (ret)
+                        return;
+        }
+
+        if (msm_port->is_uartdm)
+                iowrite32(GSBI_PROTOCOL_UART, msm_port->gsbi_base +
+                          GSBI_CONTROL);
+}
+
+static int msm_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_MSM))
+                return -EINVAL;
+        if (unlikely(port->irq != ser->irq))
+                return -EINVAL;
+        return 0;
+}
+
+static void msm_power(struct uart_port *port, unsigned int state,
+                      unsigned int oldstate)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        switch (state) {
+        case 0:
+                clk_enable(msm_port->clk);
+                if (!IS_ERR(msm_port->pclk))
+                        clk_enable(msm_port->pclk);
+                break;
+        case 3:
+                clk_disable(msm_port->clk);
+                if (!IS_ERR(msm_port->pclk))
+                        clk_disable(msm_port->pclk);
+                break;
+        default:
+                printk(KERN_ERR "msm_serial: Unknown PM state %d\n", state);
+        }
+}
+
+static struct uart_ops msm_uart_pops = {
+        .tx_empty = msm_tx_empty,
+        .set_mctrl = msm_set_mctrl,
+        .get_mctrl = msm_get_mctrl,
+        .stop_tx = msm_stop_tx,
+        .start_tx = msm_start_tx,
+        .stop_rx = msm_stop_rx,
+        .enable_ms = msm_enable_ms,
+        .break_ctl = msm_break_ctl,
+        .startup = msm_startup,
+        .shutdown = msm_shutdown,
+        .set_termios = msm_set_termios,
+        .type = msm_type,
+        .release_port = msm_release_port,
+        .request_port = msm_request_port,
+        .config_port = msm_config_port,
+        .verify_port = msm_verify_port,
+        .pm = msm_power,
+};
+
+static struct msm_port msm_uart_ports[] = {
+        {
+                .uart = {
+                        .iotype = UPIO_MEM,
+                        .ops = &msm_uart_pops,
+                        .flags = UPF_BOOT_AUTOCONF,
+                        .fifosize = 64,
+                        .line = 0,
+                },
+        },
+        {
+                .uart = {
+                        .iotype = UPIO_MEM,
+                        .ops = &msm_uart_pops,
+                        .flags = UPF_BOOT_AUTOCONF,
+                        .fifosize = 64,
+                        .line = 1,
+                },
+        },
+        {
+                .uart = {
+                        .iotype = UPIO_MEM,
+                        .ops = &msm_uart_pops,
+                        .flags = UPF_BOOT_AUTOCONF,
+                        .fifosize = 64,
+                        .line = 2,
+                },
+        },
+};
+
+#define UART_NR ARRAY_SIZE(msm_uart_ports)
+
+static inline struct uart_port *get_port_from_line(unsigned int line)
+{
+        return &msm_uart_ports[line].uart;
+}
+
+#ifdef CONFIG_SERIAL_MSM_CONSOLE
+
+static void msm_console_putchar(struct uart_port *port, int c)
+{
+        struct msm_port *msm_port = UART_TO_MSM(port);
+
+        if (msm_port->is_uartdm)
+                reset_dm_count(port);
+
+        while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
+                ;
+        msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+}
+
+static void msm_console_write(struct console *co, const char *s,
+                              unsigned int count)
+{
+        struct uart_port *port;
+        struct msm_port *msm_port;
+
+        BUG_ON(co->index < 0 || co->index >= UART_NR);
+
+        port = get_port_from_line(co->index);
+        msm_port = UART_TO_MSM(port);
+
+        spin_lock(&port->lock);
+        uart_console_write(port, s, count, msm_console_putchar);
+        spin_unlock(&port->lock);
+}
+
+static int __init msm_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        struct msm_port *msm_port;
+        int baud, flow, bits, parity;
+
+        if (unlikely(co->index >= UART_NR || co->index < 0))
+                return -ENXIO;
+
+        port = get_port_from_line(co->index);
+        msm_port = UART_TO_MSM(port);
+
+        if (unlikely(!port->membase))
+                return -ENXIO;
+
+        port->cons = co;
+
+        msm_init_clock(port);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        bits = 8;
+        parity = 'n';
+        flow = 'n';
+        msm_write(port, UART_MR2_BITS_PER_CHAR_8 | UART_MR2_STOP_BIT_LEN_ONE,
+                  UART_MR2);    /* 8N1 */
+
+        if (baud < 300 || baud > 115200)
+                baud = 115200;
+        msm_set_baud_rate(port, baud);
+
+        msm_reset(port);
+
+        if (msm_port->is_uartdm) {
+                msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
+                msm_write(port, UART_CR_TX_ENABLE, UART_CR);
+        }
+
+        printk(KERN_INFO "msm_serial: console setup on port #%d\n", port->line);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver msm_uart_driver;
+
+static struct console msm_console = {
+        .name = "ttyMSM",
+        .write = msm_console_write,
+        .device = uart_console_device,
+        .setup = msm_console_setup,
+        .flags = CON_PRINTBUFFER,
+        .index = -1,
+        .data = &msm_uart_driver,
+};
+
+#define MSM_CONSOLE     (&msm_console)
+
+#else
+#define MSM_CONSOLE     NULL
+#endif
+
+static struct uart_driver msm_uart_driver = {
+        .owner = THIS_MODULE,
+        .driver_name = "msm_serial",
+        .dev_name = "ttyMSM",
+        .nr = UART_NR,
+        .cons = MSM_CONSOLE,
+};
+
+static int __init msm_serial_probe(struct platform_device *pdev)
+{
+        struct msm_port *msm_port;
+        struct resource *resource;
+        struct uart_port *port;
+        int irq;
+
+        if (unlikely(pdev->id < 0 || pdev->id >= UART_NR))
+                return -ENXIO;
+
+        printk(KERN_INFO "msm_serial: detected port #%d\n", pdev->id);
+
+        port = get_port_from_line(pdev->id);
+        port->dev = &pdev->dev;
+        msm_port = UART_TO_MSM(port);
+
+        if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "gsbi_resource"))
+                msm_port->is_uartdm = 1;
+        else
+                msm_port->is_uartdm = 0;
+
+        if (msm_port->is_uartdm) {
+                msm_port->clk = clk_get(&pdev->dev, "gsbi_uart_clk");
+                msm_port->pclk = clk_get(&pdev->dev, "gsbi_pclk");
+        } else {
+                msm_port->clk = clk_get(&pdev->dev, "uart_clk");
+                msm_port->pclk = ERR_PTR(-ENOENT);
+        }
+
+        if (unlikely(IS_ERR(msm_port->clk) || (IS_ERR(msm_port->pclk) &&
+                                               msm_port->is_uartdm)))
+                        return PTR_ERR(msm_port->clk);
+
+        if (msm_port->is_uartdm)
+                clk_set_rate(msm_port->clk, 7372800);
+
+        port->uartclk = clk_get_rate(msm_port->clk);
+        printk(KERN_INFO "uartclk = %d\n", port->uartclk);
+
+
+        resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+                                                     "uart_resource");
+        if (unlikely(!resource))
+                return -ENXIO;
+        port->mapbase = resource->start;
+
+        irq = platform_get_irq(pdev, 0);
+        if (unlikely(irq < 0))
+                return -ENXIO;
+        port->irq = irq;
+
+        platform_set_drvdata(pdev, port);
+
+        return uart_add_one_port(&msm_uart_driver, port);
+}
+
+static int __devexit msm_serial_remove(struct platform_device *pdev)
+{
+        struct msm_port *msm_port = platform_get_drvdata(pdev);
+
+        clk_put(msm_port->clk);
+
+        return 0;
+}
+
+static struct platform_driver msm_platform_driver = {
+        .remove = msm_serial_remove,
+        .driver = {
+                .name = "msm_serial",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init msm_serial_init(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&msm_uart_driver);
+        if (unlikely(ret))
+                return ret;
+
+        ret = platform_driver_probe(&msm_platform_driver, msm_serial_probe);
+        if (unlikely(ret))
+                uart_unregister_driver(&msm_uart_driver);
+
+        printk(KERN_INFO "msm_serial: driver initialized\n");
+
+        return ret;
+}
+
+static void __exit msm_serial_exit(void)
+{
+#ifdef CONFIG_SERIAL_MSM_CONSOLE
+        unregister_console(&msm_console);
+#endif
+        platform_driver_unregister(&msm_platform_driver);
+        uart_unregister_driver(&msm_uart_driver);
+}
+
+module_init(msm_serial_init);
+module_exit(msm_serial_exit);
+
+MODULE_AUTHOR("Robert Love <rlove@google.com>");
+MODULE_DESCRIPTION("Driver for msm7x serial device");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h
new file mode 100644
index 000000000000..e4acef5de77e
--- /dev/null
+++ b/drivers/tty/serial/msm_serial.h
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Robert Love <rlove@google.com>
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __DRIVERS_SERIAL_MSM_SERIAL_H
+#define __DRIVERS_SERIAL_MSM_SERIAL_H
+
+#define UART_MR1                        0x0000
+
+#define UART_MR1_AUTO_RFR_LEVEL0        0x3F
+#define UART_MR1_AUTO_RFR_LEVEL1        0x3FF00
+#define UART_MR1_RX_RDY_CTL             (1 << 7)
+#define UART_MR1_CTS_CTL                (1 << 6)
+
+#define UART_MR2                        0x0004
+#define UART_MR2_ERROR_MODE             (1 << 6)
+#define UART_MR2_BITS_PER_CHAR          0x30
+#define UART_MR2_BITS_PER_CHAR_5        (0x0 << 4)
+#define UART_MR2_BITS_PER_CHAR_6        (0x1 << 4)
+#define UART_MR2_BITS_PER_CHAR_7        (0x2 << 4)
+#define UART_MR2_BITS_PER_CHAR_8        (0x3 << 4)
+#define UART_MR2_STOP_BIT_LEN_ONE       (0x1 << 2)
+#define UART_MR2_STOP_BIT_LEN_TWO       (0x3 << 2)
+#define UART_MR2_PARITY_MODE_NONE       0x0
+#define UART_MR2_PARITY_MODE_ODD        0x1
+#define UART_MR2_PARITY_MODE_EVEN       0x2
+#define UART_MR2_PARITY_MODE_SPACE      0x3
+#define UART_MR2_PARITY_MODE            0x3
+
+#define UART_CSR        0x0008
+#define UART_CSR_115200 0xFF
+#define UART_CSR_57600  0xEE
+#define UART_CSR_38400  0xDD
+#define UART_CSR_28800  0xCC
+#define UART_CSR_19200  0xBB
+#define UART_CSR_14400  0xAA
+#define UART_CSR_9600   0x99
+#define UART_CSR_4800   0x77
+#define UART_CSR_2400   0x55
+#define UART_CSR_1200   0x44
+#define UART_CSR_600    0x33
+#define UART_CSR_300    0x22
+
+#define UART_TF         0x000C
+#define UARTDM_TF       0x0070
+
+#define UART_CR                         0x0010
+#define UART_CR_CMD_NULL                (0 << 4)
+#define UART_CR_CMD_RESET_RX            (1 << 4)
+#define UART_CR_CMD_RESET_TX            (2 << 4)
+#define UART_CR_CMD_RESET_ERR           (3 << 4)
+#define UART_CR_CMD_RESET_BREAK_INT     (4 << 4)
+#define UART_CR_CMD_START_BREAK         (5 << 4)
+#define UART_CR_CMD_STOP_BREAK          (6 << 4)
+#define UART_CR_CMD_RESET_CTS           (7 << 4)
+#define UART_CR_CMD_RESET_STALE_INT     (8 << 4)
+#define UART_CR_CMD_PACKET_MODE         (9 << 4)
+#define UART_CR_CMD_MODE_RESET          (12 << 4)
+#define UART_CR_CMD_SET_RFR             (13 << 4)
+#define UART_CR_CMD_RESET_RFR           (14 << 4)
+#define UART_CR_CMD_PROTECTION_EN       (16 << 4)
+#define UART_CR_CMD_STALE_EVENT_ENABLE  (80 << 4)
+#define UART_CR_TX_DISABLE              (1 << 3)
+#define UART_CR_TX_ENABLE               (1 << 2)
+#define UART_CR_RX_DISABLE              (1 << 1)
+#define UART_CR_RX_ENABLE               (1 << 0)
+
+#define UART_IMR                0x0014
+#define UART_IMR_TXLEV          (1 << 0)
+#define UART_IMR_RXSTALE        (1 << 3)
+#define UART_IMR_RXLEV          (1 << 4)
+#define UART_IMR_DELTA_CTS      (1 << 5)
+#define UART_IMR_CURRENT_CTS    (1 << 6)
+
+#define UART_IPR_RXSTALE_LAST           0x20
+#define UART_IPR_STALE_LSB              0x1F
+#define UART_IPR_STALE_TIMEOUT_MSB      0x3FF80
+
+#define UART_IPR        0x0018
+#define UART_TFWR       0x001C
+#define UART_RFWR       0x0020
+#define UART_HCR        0x0024
+
+#define UART_MREG               0x0028
+#define UART_NREG               0x002C
+#define UART_DREG               0x0030
+#define UART_MNDREG             0x0034
+#define UART_IRDA               0x0038
+#define UART_MISR_MODE          0x0040
+#define UART_MISR_RESET         0x0044
+#define UART_MISR_EXPORT        0x0048
+#define UART_MISR_VAL           0x004C
+#define UART_TEST_CTRL          0x0050
+
+#define UART_SR                 0x0008
+#define UART_SR_HUNT_CHAR       (1 << 7)
+#define UART_SR_RX_BREAK        (1 << 6)
+#define UART_SR_PAR_FRAME_ERR   (1 << 5)
+#define UART_SR_OVERRUN         (1 << 4)
+#define UART_SR_TX_EMPTY        (1 << 3)
+#define UART_SR_TX_READY        (1 << 2)
+#define UART_SR_RX_FULL         (1 << 1)
+#define UART_SR_RX_READY        (1 << 0)
+
+#define UART_RF                 0x000C
+#define UARTDM_RF               0x0070
+#define UART_MISR               0x0010
+#define UART_ISR                0x0014
+#define UART_ISR_TX_READY       (1 << 7)
+
+#define GSBI_CONTROL            0x0
+#define GSBI_PROTOCOL_CODE      0x30
+#define GSBI_PROTOCOL_UART      0x40
+#define GSBI_PROTOCOL_IDLE      0x0
+
+#define UARTDM_DMRX             0x34
+#define UARTDM_NCF_TX           0x40
+#define UARTDM_RX_TOTAL_SNAP    0x38
+
+#define UART_TO_MSM(uart_port)  ((struct msm_port *) uart_port)
+
+static inline
+void msm_write(struct uart_port *port, unsigned int val, unsigned int off)
+{
+        __raw_writel(val, port->membase + off);
+}
+
+static inline
+unsigned int msm_read(struct uart_port *port, unsigned int off)
+{
+        return __raw_readl(port->membase + off);
+}
+
+/*
+ * Setup the MND registers to use the TCXO clock.
+ */
+static inline void msm_serial_set_mnd_regs_tcxo(struct uart_port *port)
+{
+        msm_write(port, 0x06, UART_MREG);
+        msm_write(port, 0xF1, UART_NREG);
+        msm_write(port, 0x0F, UART_DREG);
+        msm_write(port, 0x1A, UART_MNDREG);
+}
+
+/*
+ * Setup the MND registers to use the TCXO clock divided by 4.
+ */
+static inline void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port)
+{
+        msm_write(port, 0x18, UART_MREG);
+        msm_write(port, 0xF6, UART_NREG);
+        msm_write(port, 0x0F, UART_DREG);
+        msm_write(port, 0x0A, UART_MNDREG);
+}
+
+static inline
+void msm_serial_set_mnd_regs_from_uartclk(struct uart_port *port)
+{
+        if (port->uartclk == 19200000)
+                msm_serial_set_mnd_regs_tcxo(port);
+        else
+                msm_serial_set_mnd_regs_tcxoby4(port);
+}
+
+/*
+ * TROUT has a specific defect that makes it report it's uartclk
+ * as 19.2Mhz (TCXO) when it's actually 4.8Mhz (TCXO/4). This special
+ * cases TROUT to use the right clock.
+ */
+#ifdef CONFIG_MACH_TROUT
+#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_tcxoby4
+#else
+#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_from_uartclk
+#endif
+
+#endif  /* __DRIVERS_SERIAL_MSM_SERIAL_H */
diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c
new file mode 100644
index 000000000000..624701f8138a
--- /dev/null
+++ b/drivers/tty/serial/msm_serial_hs.c
@@ -0,0 +1,1880 @@
+/*
+ * MSM 7k/8k High speed uart driver
+ *
+ * Copyright (c) 2007-2011, Code Aurora Forum. All rights reserved.
+ * Copyright (c) 2008 Google Inc.
+ * Modified: Nick Pelly <npelly@google.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Has optional support for uart power management independent of linux
+ * suspend/resume:
+ *
+ * RX wakeup.
+ * UART wakeup can be triggered by RX activity (using a wakeup GPIO on the
+ * UART RX pin). This should only be used if there is not a wakeup
+ * GPIO on the UART CTS, and the first RX byte is known (for example, with the
+ * Bluetooth Texas Instruments HCILL protocol), since the first RX byte will
+ * always be lost. RTS will be asserted even while the UART is off in this mode
+ * of operation. See msm_serial_hs_platform_data.rx_wakeup_irq.
+ */
+
+#include <linux/module.h>
+
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include <linux/atomic.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+
+#include <mach/hardware.h>
+#include <mach/dma.h>
+#include <linux/platform_data/msm_serial_hs.h>
+
+/* HSUART Registers */
+#define UARTDM_MR1_ADDR 0x0
+#define UARTDM_MR2_ADDR 0x4
+
+/* Data Mover result codes */
+#define RSLT_FIFO_CNTR_BMSK (0xE << 28)
+#define RSLT_VLD            BIT(1)
+
+/* write only register */
+#define UARTDM_CSR_ADDR 0x8
+#define UARTDM_CSR_115200 0xFF
+#define UARTDM_CSR_57600  0xEE
+#define UARTDM_CSR_38400  0xDD
+#define UARTDM_CSR_28800  0xCC
+#define UARTDM_CSR_19200  0xBB
+#define UARTDM_CSR_14400  0xAA
+#define UARTDM_CSR_9600   0x99
+#define UARTDM_CSR_7200   0x88
+#define UARTDM_CSR_4800   0x77
+#define UARTDM_CSR_3600   0x66
+#define UARTDM_CSR_2400   0x55
+#define UARTDM_CSR_1200   0x44
+#define UARTDM_CSR_600    0x33
+#define UARTDM_CSR_300    0x22
+#define UARTDM_CSR_150    0x11
+#define UARTDM_CSR_75     0x00
+
+/* write only register */
+#define UARTDM_TF_ADDR 0x70
+#define UARTDM_TF2_ADDR 0x74
+#define UARTDM_TF3_ADDR 0x78
+#define UARTDM_TF4_ADDR 0x7C
+
+/* write only register */
+#define UARTDM_CR_ADDR 0x10
+#define UARTDM_IMR_ADDR 0x14
+
+#define UARTDM_IPR_ADDR 0x18
+#define UARTDM_TFWR_ADDR 0x1c
+#define UARTDM_RFWR_ADDR 0x20
+#define UARTDM_HCR_ADDR 0x24
+#define UARTDM_DMRX_ADDR 0x34
+#define UARTDM_IRDA_ADDR 0x38
+#define UARTDM_DMEN_ADDR 0x3c
+
+/* UART_DM_NO_CHARS_FOR_TX */
+#define UARTDM_NCF_TX_ADDR 0x40
+
+#define UARTDM_BADR_ADDR 0x44
+
+#define UARTDM_SIM_CFG_ADDR 0x80
+/* Read Only register */
+#define UARTDM_SR_ADDR 0x8
+
+/* Read Only register */
+#define UARTDM_RF_ADDR  0x70
+#define UARTDM_RF2_ADDR 0x74
+#define UARTDM_RF3_ADDR 0x78
+#define UARTDM_RF4_ADDR 0x7C
+
+/* Read Only register */
+#define UARTDM_MISR_ADDR 0x10
+
+/* Read Only register */
+#define UARTDM_ISR_ADDR 0x14
+#define UARTDM_RX_TOTAL_SNAP_ADDR 0x38
+
+#define UARTDM_RXFS_ADDR 0x50
+
+/* Register field Mask Mapping */
+#define UARTDM_SR_PAR_FRAME_BMSK        BIT(5)
+#define UARTDM_SR_OVERRUN_BMSK          BIT(4)
+#define UARTDM_SR_TXEMT_BMSK            BIT(3)
+#define UARTDM_SR_TXRDY_BMSK            BIT(2)
+#define UARTDM_SR_RXRDY_BMSK            BIT(0)
+
+#define UARTDM_CR_TX_DISABLE_BMSK       BIT(3)
+#define UARTDM_CR_RX_DISABLE_BMSK       BIT(1)
+#define UARTDM_CR_TX_EN_BMSK            BIT(2)
+#define UARTDM_CR_RX_EN_BMSK            BIT(0)
+
+/* UARTDM_CR channel_comman bit value (register field is bits 8:4) */
+#define RESET_RX                0x10
+#define RESET_TX                0x20
+#define RESET_ERROR_STATUS      0x30
+#define RESET_BREAK_INT         0x40
+#define START_BREAK             0x50
+#define STOP_BREAK              0x60
+#define RESET_CTS               0x70
+#define RESET_STALE_INT         0x80
+#define RFR_LOW                 0xD0
+#define RFR_HIGH                0xE0
+#define CR_PROTECTION_EN        0x100
+#define STALE_EVENT_ENABLE      0x500
+#define STALE_EVENT_DISABLE     0x600
+#define FORCE_STALE_EVENT       0x400
+#define CLEAR_TX_READY          0x300
+#define RESET_TX_ERROR          0x800
+#define RESET_TX_DONE           0x810
+
+#define UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK 0xffffff00
+#define UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK 0x3f
+#define UARTDM_MR1_CTS_CTL_BMSK 0x40
+#define UARTDM_MR1_RX_RDY_CTL_BMSK 0x80
+
+#define UARTDM_MR2_ERROR_MODE_BMSK 0x40
+#define UARTDM_MR2_BITS_PER_CHAR_BMSK 0x30
+
+/* bits per character configuration */
+#define FIVE_BPC  (0 << 4)
+#define SIX_BPC   (1 << 4)
+#define SEVEN_BPC (2 << 4)
+#define EIGHT_BPC (3 << 4)
+
+#define UARTDM_MR2_STOP_BIT_LEN_BMSK 0xc
+#define STOP_BIT_ONE (1 << 2)
+#define STOP_BIT_TWO (3 << 2)
+
+#define UARTDM_MR2_PARITY_MODE_BMSK 0x3
+
+/* Parity configuration */
+#define NO_PARITY 0x0
+#define EVEN_PARITY 0x1
+#define ODD_PARITY 0x2
+#define SPACE_PARITY 0x3
+
+#define UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK 0xffffff80
+#define UARTDM_IPR_STALE_LSB_BMSK 0x1f
+
+/* These can be used for both ISR and IMR register */
+#define UARTDM_ISR_TX_READY_BMSK        BIT(7)
+#define UARTDM_ISR_CURRENT_CTS_BMSK     BIT(6)
+#define UARTDM_ISR_DELTA_CTS_BMSK       BIT(5)
+#define UARTDM_ISR_RXLEV_BMSK           BIT(4)
+#define UARTDM_ISR_RXSTALE_BMSK         BIT(3)
+#define UARTDM_ISR_RXBREAK_BMSK         BIT(2)
+#define UARTDM_ISR_RXHUNT_BMSK          BIT(1)
+#define UARTDM_ISR_TXLEV_BMSK           BIT(0)
+
+/* Field definitions for UART_DM_DMEN*/
+#define UARTDM_TX_DM_EN_BMSK 0x1
+#define UARTDM_RX_DM_EN_BMSK 0x2
+
+#define UART_FIFOSIZE 64
+#define UARTCLK 7372800
+
+/* Rx DMA request states */
+enum flush_reason {
+        FLUSH_NONE,
+        FLUSH_DATA_READY,
+        FLUSH_DATA_INVALID,  /* values after this indicate invalid data */
+        FLUSH_IGNORE = FLUSH_DATA_INVALID,
+        FLUSH_STOP,
+        FLUSH_SHUTDOWN,
+};
+
+/* UART clock states */
+enum msm_hs_clk_states_e {
+        MSM_HS_CLK_PORT_OFF,     /* port not in use */
+        MSM_HS_CLK_OFF,          /* clock disabled */
+        MSM_HS_CLK_REQUEST_OFF,  /* disable after TX and RX flushed */
+        MSM_HS_CLK_ON,           /* clock enabled */
+};
+
+/* Track the forced RXSTALE flush during clock off sequence.
+ * These states are only valid during MSM_HS_CLK_REQUEST_OFF */
+enum msm_hs_clk_req_off_state_e {
+        CLK_REQ_OFF_START,
+        CLK_REQ_OFF_RXSTALE_ISSUED,
+        CLK_REQ_OFF_FLUSH_ISSUED,
+        CLK_REQ_OFF_RXSTALE_FLUSHED,
+};
+
+/**
+ * struct msm_hs_tx
+ * @tx_ready_int_en: ok to dma more tx?
+ * @dma_in_flight: tx dma in progress
+ * @xfer: top level DMA command pointer structure
+ * @command_ptr: third level command struct pointer
+ * @command_ptr_ptr: second level command list struct pointer
+ * @mapped_cmd_ptr: DMA view of third level command struct
+ * @mapped_cmd_ptr_ptr: DMA view of second level command list struct
+ * @tx_count: number of bytes to transfer in DMA transfer
+ * @dma_base: DMA view of UART xmit buffer
+ *
+ * This structure describes a single Tx DMA transaction. MSM DMA
+ * commands have two levels of indirection. The top level command
+ * ptr points to a list of command ptr which in turn points to a
+ * single DMA 'command'. In our case each Tx transaction consists
+ * of a single second level pointer pointing to a 'box type' command.
+ */
+struct msm_hs_tx {
+        unsigned int tx_ready_int_en;
+        unsigned int dma_in_flight;
+        struct msm_dmov_cmd xfer;
+        dmov_box *command_ptr;
+        u32 *command_ptr_ptr;
+        dma_addr_t mapped_cmd_ptr;
+        dma_addr_t mapped_cmd_ptr_ptr;
+        int tx_count;
+        dma_addr_t dma_base;
+};
+
+/**
+ * struct msm_hs_rx
+ * @flush: Rx DMA request state
+ * @xfer: top level DMA command pointer structure
+ * @cmdptr_dmaaddr: DMA view of second level command structure
+ * @command_ptr: third level DMA command pointer structure
+ * @command_ptr_ptr: second level DMA command list pointer
+ * @mapped_cmd_ptr: DMA view of the third level command structure
+ * @wait: wait for DMA completion before shutdown
+ * @buffer: destination buffer for RX DMA
+ * @rbuffer: DMA view of buffer
+ * @pool: dma pool out of which coherent rx buffer is allocated
+ * @tty_work: private work-queue for tty flip buffer push task
+ *
+ * This structure describes a single Rx DMA transaction. Rx DMA
+ * transactions use box mode DMA commands.
+ */
+struct msm_hs_rx {
+        enum flush_reason flush;
+        struct msm_dmov_cmd xfer;
+        dma_addr_t cmdptr_dmaaddr;
+        dmov_box *command_ptr;
+        u32 *command_ptr_ptr;
+        dma_addr_t mapped_cmd_ptr;
+        wait_queue_head_t wait;
+        dma_addr_t rbuffer;
+        unsigned char *buffer;
+        struct dma_pool *pool;
+        struct work_struct tty_work;
+};
+
+/**
+ * struct msm_hs_rx_wakeup
+ * @irq: IRQ line to be configured as interrupt source on Rx activity
+ * @ignore: boolean value. 1 = ignore the wakeup interrupt
+ * @rx_to_inject: extra character to be inserted to Rx tty on wakeup
+ * @inject_rx: 1 = insert rx_to_inject. 0 = do not insert extra character
+ *
+ * This is an optional structure required for UART Rx GPIO IRQ based
+ * wakeup from low power state. UART wakeup can be triggered by RX activity
+ * (using a wakeup GPIO on the UART RX pin). This should only be used if
+ * there is not a wakeup GPIO on the UART CTS, and the first RX byte is
+ * known (eg., with the Bluetooth Texas Instruments HCILL protocol),
+ * since the first RX byte will always be lost. RTS will be asserted even
+ * while the UART is clocked off in this mode of operation.
+ */
+struct msm_hs_rx_wakeup {
+        int irq;  /* < 0 indicates low power wakeup disabled */
+        unsigned char ignore;
+        unsigned char inject_rx;
+        char rx_to_inject;
+};
+
+/**
+ * struct msm_hs_port
+ * @uport: embedded uart port structure
+ * @imr_reg: shadow value of UARTDM_IMR
+ * @clk: uart input clock handle
+ * @tx: Tx transaction related data structure
+ * @rx: Rx transaction related data structure
+ * @dma_tx_channel: Tx DMA command channel
+ * @dma_rx_channel Rx DMA command channel
+ * @dma_tx_crci: Tx channel rate control interface number
+ * @dma_rx_crci: Rx channel rate control interface number
+ * @clk_off_timer: Timer to poll DMA event completion before clock off
+ * @clk_off_delay: clk_off_timer poll interval
+ * @clk_state: overall clock state
+ * @clk_req_off_state: post flush clock states
+ * @rx_wakeup: optional rx_wakeup feature related data
+ * @exit_lpm_cb: optional callback to exit low power mode
+ *
+ * Low level serial port structure.
+ */
+struct msm_hs_port {
+        struct uart_port uport;
+        unsigned long imr_reg;
+        struct clk *clk;
+        struct msm_hs_tx tx;
+        struct msm_hs_rx rx;
+
+        int dma_tx_channel;
+        int dma_rx_channel;
+        int dma_tx_crci;
+        int dma_rx_crci;
+
+        struct hrtimer clk_off_timer;
+        ktime_t clk_off_delay;
+        enum msm_hs_clk_states_e clk_state;
+        enum msm_hs_clk_req_off_state_e clk_req_off_state;
+
+        struct msm_hs_rx_wakeup rx_wakeup;
+        void (*exit_lpm_cb)(struct uart_port *);
+};
+
+#define MSM_UARTDM_BURST_SIZE 16   /* DM burst size (in bytes) */
+#define UARTDM_TX_BUF_SIZE UART_XMIT_SIZE
+#define UARTDM_RX_BUF_SIZE 512
+
+#define UARTDM_NR 2
+
+static struct msm_hs_port q_uart_port[UARTDM_NR];
+static struct platform_driver msm_serial_hs_platform_driver;
+static struct uart_driver msm_hs_driver;
+static struct uart_ops msm_hs_ops;
+static struct workqueue_struct *msm_hs_workqueue;
+
+#define UARTDM_TO_MSM(uart_port) \
+        container_of((uart_port), struct msm_hs_port, uport)
+
+static unsigned int use_low_power_rx_wakeup(struct msm_hs_port
+                                                   *msm_uport)
+{
+        return (msm_uport->rx_wakeup.irq >= 0);
+}
+
+static unsigned int msm_hs_read(struct uart_port *uport,
+                                       unsigned int offset)
+{
+        return ioread32(uport->membase + offset);
+}
+
+static void msm_hs_write(struct uart_port *uport, unsigned int offset,
+                                 unsigned int value)
+{
+        iowrite32(value, uport->membase + offset);
+}
+
+static void msm_hs_release_port(struct uart_port *port)
+{
+        iounmap(port->membase);
+}
+
+static int msm_hs_request_port(struct uart_port *port)
+{
+        port->membase = ioremap(port->mapbase, PAGE_SIZE);
+        if (unlikely(!port->membase))
+                return -ENOMEM;
+
+        /* configure the CR Protection to Enable */
+        msm_hs_write(port, UARTDM_CR_ADDR, CR_PROTECTION_EN);
+        return 0;
+}
+
+static int __devexit msm_hs_remove(struct platform_device *pdev)
+{
+
+        struct msm_hs_port *msm_uport;
+        struct device *dev;
+
+        if (pdev->id < 0 || pdev->id >= UARTDM_NR) {
+                printk(KERN_ERR "Invalid plaform device ID = %d\n", pdev->id);
+                return -EINVAL;
+        }
+
+        msm_uport = &q_uart_port[pdev->id];
+        dev = msm_uport->uport.dev;
+
+        dma_unmap_single(dev, msm_uport->rx.mapped_cmd_ptr, sizeof(dmov_box),
+                         DMA_TO_DEVICE);
+        dma_pool_free(msm_uport->rx.pool, msm_uport->rx.buffer,
+                      msm_uport->rx.rbuffer);
+        dma_pool_destroy(msm_uport->rx.pool);
+
+        dma_unmap_single(dev, msm_uport->rx.cmdptr_dmaaddr, sizeof(u32 *),
+                         DMA_TO_DEVICE);
+        dma_unmap_single(dev, msm_uport->tx.mapped_cmd_ptr_ptr, sizeof(u32 *),
+                         DMA_TO_DEVICE);
+        dma_unmap_single(dev, msm_uport->tx.mapped_cmd_ptr, sizeof(dmov_box),
+                         DMA_TO_DEVICE);
+
+        uart_remove_one_port(&msm_hs_driver, &msm_uport->uport);
+        clk_put(msm_uport->clk);
+
+        /* Free the tx resources */
+        kfree(msm_uport->tx.command_ptr);
+        kfree(msm_uport->tx.command_ptr_ptr);
+
+        /* Free the rx resources */
+        kfree(msm_uport->rx.command_ptr);
+        kfree(msm_uport->rx.command_ptr_ptr);
+
+        iounmap(msm_uport->uport.membase);
+
+        return 0;
+}
+
+static int msm_hs_init_clk_locked(struct uart_port *uport)
+{
+        int ret;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        ret = clk_enable(msm_uport->clk);
+        if (ret) {
+                printk(KERN_ERR "Error could not turn on UART clk\n");
+                return ret;
+        }
+
+        /* Set up the MREG/NREG/DREG/MNDREG */
+        ret = clk_set_rate(msm_uport->clk, uport->uartclk);
+        if (ret) {
+                printk(KERN_WARNING "Error setting clock rate on UART\n");
+                clk_disable(msm_uport->clk);
+                return ret;
+        }
+
+        msm_uport->clk_state = MSM_HS_CLK_ON;
+        return 0;
+}
+
+/* Enable and Disable clocks  (Used for power management) */
+static void msm_hs_pm(struct uart_port *uport, unsigned int state,
+                      unsigned int oldstate)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        if (use_low_power_rx_wakeup(msm_uport) ||
+            msm_uport->exit_lpm_cb)
+                return;  /* ignore linux PM states,
+                            use msm_hs_request_clock API */
+
+        switch (state) {
+        case 0:
+                clk_enable(msm_uport->clk);
+                break;
+        case 3:
+                clk_disable(msm_uport->clk);
+                break;
+        default:
+                dev_err(uport->dev, "msm_serial: Unknown PM state %d\n",
+                        state);
+        }
+}
+
+/*
+ * programs the UARTDM_CSR register with correct bit rates
+ *
+ * Interrupts should be disabled before we are called, as
+ * we modify Set Baud rate
+ * Set receive stale interrupt level, dependent on Bit Rate
+ * Goal is to have around 8 ms before indicate stale.
+ * roundup (((Bit Rate * .008) / 10) + 1
+ */
+static void msm_hs_set_bps_locked(struct uart_port *uport,
+                                  unsigned int bps)
+{
+        unsigned long rxstale;
+        unsigned long data;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        switch (bps) {
+        case 300:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_75);
+                rxstale = 1;
+                break;
+        case 600:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_150);
+                rxstale = 1;
+                break;
+        case 1200:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_300);
+                rxstale = 1;
+                break;
+        case 2400:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_600);
+                rxstale = 1;
+                break;
+        case 4800:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_1200);
+                rxstale = 1;
+                break;
+        case 9600:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_2400);
+                rxstale = 2;
+                break;
+        case 14400:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_3600);
+                rxstale = 3;
+                break;
+        case 19200:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_4800);
+                rxstale = 4;
+                break;
+        case 28800:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_7200);
+                rxstale = 6;
+                break;
+        case 38400:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_9600);
+                rxstale = 8;
+                break;
+        case 57600:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_14400);
+                rxstale = 16;
+                break;
+        case 76800:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_19200);
+                rxstale = 16;
+                break;
+        case 115200:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_28800);
+                rxstale = 31;
+                break;
+        case 230400:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_57600);
+                rxstale = 31;
+                break;
+        case 460800:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_115200);
+                rxstale = 31;
+                break;
+        case 4000000:
+        case 3686400:
+        case 3200000:
+        case 3500000:
+        case 3000000:
+        case 2500000:
+        case 1500000:
+        case 1152000:
+        case 1000000:
+        case 921600:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_115200);
+                rxstale = 31;
+                break;
+        default:
+                msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_2400);
+                /* default to 9600 */
+                bps = 9600;
+                rxstale = 2;
+                break;
+        }
+        if (bps > 460800)
+                uport->uartclk = bps * 16;
+        else
+                uport->uartclk = UARTCLK;
+
+        if (clk_set_rate(msm_uport->clk, uport->uartclk)) {
+                printk(KERN_WARNING "Error setting clock rate on UART\n");
+                return;
+        }
+
+        data = rxstale & UARTDM_IPR_STALE_LSB_BMSK;
+        data |= UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK & (rxstale << 2);
+
+        msm_hs_write(uport, UARTDM_IPR_ADDR, data);
+}
+
+/*
+ * termios :  new ktermios
+ * oldtermios:  old ktermios previous setting
+ *
+ * Configure the serial port
+ */
+static void msm_hs_set_termios(struct uart_port *uport,
+                               struct ktermios *termios,
+                               struct ktermios *oldtermios)
+{
+        unsigned int bps;
+        unsigned long data;
+        unsigned long flags;
+        unsigned int c_cflag = termios->c_cflag;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        spin_lock_irqsave(&uport->lock, flags);
+        clk_enable(msm_uport->clk);
+
+        /* 300 is the minimum baud support by the driver  */
+        bps = uart_get_baud_rate(uport, termios, oldtermios, 200, 4000000);
+
+        /* Temporary remapping  200 BAUD to 3.2 mbps */
+        if (bps == 200)
+                bps = 3200000;
+
+        msm_hs_set_bps_locked(uport, bps);
+
+        data = msm_hs_read(uport, UARTDM_MR2_ADDR);
+        data &= ~UARTDM_MR2_PARITY_MODE_BMSK;
+        /* set parity */
+        if (PARENB == (c_cflag & PARENB)) {
+                if (PARODD == (c_cflag & PARODD))
+                        data |= ODD_PARITY;
+                else if (CMSPAR == (c_cflag & CMSPAR))
+                        data |= SPACE_PARITY;
+                else
+                        data |= EVEN_PARITY;
+        }
+
+        /* Set bits per char */
+        data &= ~UARTDM_MR2_BITS_PER_CHAR_BMSK;
+
+        switch (c_cflag & CSIZE) {
+        case CS5:
+                data |= FIVE_BPC;
+                break;
+        case CS6:
+                data |= SIX_BPC;
+                break;
+        case CS7:
+                data |= SEVEN_BPC;
+                break;
+        default:
+                data |= EIGHT_BPC;
+                break;
+        }
+        /* stop bits */
+        if (c_cflag & CSTOPB) {
+                data |= STOP_BIT_TWO;
+        } else {
+                /* otherwise 1 stop bit */
+                data |= STOP_BIT_ONE;
+        }
+        data |= UARTDM_MR2_ERROR_MODE_BMSK;
+        /* write parity/bits per char/stop bit configuration */
+        msm_hs_write(uport, UARTDM_MR2_ADDR, data);
+
+        /* Configure HW flow control */
+        data = msm_hs_read(uport, UARTDM_MR1_ADDR);
+
+        data &= ~(UARTDM_MR1_CTS_CTL_BMSK | UARTDM_MR1_RX_RDY_CTL_BMSK);
+
+        if (c_cflag & CRTSCTS) {
+                data |= UARTDM_MR1_CTS_CTL_BMSK;
+                data |= UARTDM_MR1_RX_RDY_CTL_BMSK;
+        }
+
+        msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+
+        uport->ignore_status_mask = termios->c_iflag & INPCK;
+        uport->ignore_status_mask |= termios->c_iflag & IGNPAR;
+        uport->read_status_mask = (termios->c_cflag & CREAD);
+
+        msm_hs_write(uport, UARTDM_IMR_ADDR, 0);
+
+        /* Set Transmit software time out */
+        uart_update_timeout(uport, c_cflag, bps);
+
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX);
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_TX);
+
+        if (msm_uport->rx.flush == FLUSH_NONE) {
+                msm_uport->rx.flush = FLUSH_IGNORE;
+                msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1);
+        }
+
+        msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+        clk_disable(msm_uport->clk);
+        spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+/*
+ *  Standard API, Transmitter
+ *  Any character in the transmit shift register is sent
+ */
+static unsigned int msm_hs_tx_empty(struct uart_port *uport)
+{
+        unsigned int data;
+        unsigned int ret = 0;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        clk_enable(msm_uport->clk);
+
+        data = msm_hs_read(uport, UARTDM_SR_ADDR);
+        if (data & UARTDM_SR_TXEMT_BMSK)
+                ret = TIOCSER_TEMT;
+
+        clk_disable(msm_uport->clk);
+
+        return ret;
+}
+
+/*
+ *  Standard API, Stop transmitter.
+ *  Any character in the transmit shift register is sent as
+ *  well as the current data mover transfer .
+ */
+static void msm_hs_stop_tx_locked(struct uart_port *uport)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        msm_uport->tx.tx_ready_int_en = 0;
+}
+
+/*
+ *  Standard API, Stop receiver as soon as possible.
+ *
+ *  Function immediately terminates the operation of the
+ *  channel receiver and any incoming characters are lost. None
+ *  of the receiver status bits are affected by this command and
+ *  characters that are already in the receive FIFO there.
+ */
+static void msm_hs_stop_rx_locked(struct uart_port *uport)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+        unsigned int data;
+
+        clk_enable(msm_uport->clk);
+
+        /* disable dlink */
+        data = msm_hs_read(uport, UARTDM_DMEN_ADDR);
+        data &= ~UARTDM_RX_DM_EN_BMSK;
+        msm_hs_write(uport, UARTDM_DMEN_ADDR, data);
+
+        /* Disable the receiver */
+        if (msm_uport->rx.flush == FLUSH_NONE)
+                msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1);
+
+        if (msm_uport->rx.flush != FLUSH_SHUTDOWN)
+                msm_uport->rx.flush = FLUSH_STOP;
+
+        clk_disable(msm_uport->clk);
+}
+
+/*  Transmit the next chunk of data */
+static void msm_hs_submit_tx_locked(struct uart_port *uport)
+{
+        int left;
+        int tx_count;
+        dma_addr_t src_addr;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+        struct msm_hs_tx *tx = &msm_uport->tx;
+        struct circ_buf *tx_buf = &msm_uport->uport.state->xmit;
+
+        if (uart_circ_empty(tx_buf) || uport->state->port.tty->stopped) {
+                msm_hs_stop_tx_locked(uport);
+                return;
+        }
+
+        tx->dma_in_flight = 1;
+
+        tx_count = uart_circ_chars_pending(tx_buf);
+
+        if (UARTDM_TX_BUF_SIZE < tx_count)
+                tx_count = UARTDM_TX_BUF_SIZE;
+
+        left = UART_XMIT_SIZE - tx_buf->tail;
+
+        if (tx_count > left)
+                tx_count = left;
+
+        src_addr = tx->dma_base + tx_buf->tail;
+        dma_sync_single_for_device(uport->dev, src_addr, tx_count,
+                                   DMA_TO_DEVICE);
+
+        tx->command_ptr->num_rows = (((tx_count + 15) >> 4) << 16) |
+                                     ((tx_count + 15) >> 4);
+        tx->command_ptr->src_row_addr = src_addr;
+
+        dma_sync_single_for_device(uport->dev, tx->mapped_cmd_ptr,
+                                   sizeof(dmov_box), DMA_TO_DEVICE);
+
+        *tx->command_ptr_ptr = CMD_PTR_LP | DMOV_CMD_ADDR(tx->mapped_cmd_ptr);
+
+        dma_sync_single_for_device(uport->dev, tx->mapped_cmd_ptr_ptr,
+                                   sizeof(u32 *), DMA_TO_DEVICE);
+
+        /* Save tx_count to use in Callback */
+        tx->tx_count = tx_count;
+        msm_hs_write(uport, UARTDM_NCF_TX_ADDR, tx_count);
+
+        /* Disable the tx_ready interrupt */
+        msm_uport->imr_reg &= ~UARTDM_ISR_TX_READY_BMSK;
+        msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+        msm_dmov_enqueue_cmd(msm_uport->dma_tx_channel, &tx->xfer);
+}
+
+/* Start to receive the next chunk of data */
+static void msm_hs_start_rx_locked(struct uart_port *uport)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT);
+        msm_hs_write(uport, UARTDM_DMRX_ADDR, UARTDM_RX_BUF_SIZE);
+        msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_ENABLE);
+        msm_uport->imr_reg |= UARTDM_ISR_RXLEV_BMSK;
+        msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+        msm_uport->rx.flush = FLUSH_NONE;
+        msm_dmov_enqueue_cmd(msm_uport->dma_rx_channel, &msm_uport->rx.xfer);
+
+        /* might have finished RX and be ready to clock off */
+        hrtimer_start(&msm_uport->clk_off_timer, msm_uport->clk_off_delay,
+                        HRTIMER_MODE_REL);
+}
+
+/* Enable the transmitter Interrupt */
+static void msm_hs_start_tx_locked(struct uart_port *uport)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        clk_enable(msm_uport->clk);
+
+        if (msm_uport->exit_lpm_cb)
+                msm_uport->exit_lpm_cb(uport);
+
+        if (msm_uport->tx.tx_ready_int_en == 0) {
+                msm_uport->tx.tx_ready_int_en = 1;
+                msm_hs_submit_tx_locked(uport);
+        }
+
+        clk_disable(msm_uport->clk);
+}
+
+/*
+ *  This routine is called when we are done with a DMA transfer
+ *
+ *  This routine is registered with Data mover when we set
+ *  up a Data Mover transfer. It is called from Data mover ISR
+ *  when the DMA transfer is done.
+ */
+static void msm_hs_dmov_tx_callback(struct msm_dmov_cmd *cmd_ptr,
+                                        unsigned int result,
+                                        struct msm_dmov_errdata *err)
+{
+        unsigned long flags;
+        struct msm_hs_port *msm_uport;
+
+        /* DMA did not finish properly */
+        WARN_ON((((result & RSLT_FIFO_CNTR_BMSK) >> 28) == 1) &&
+                !(result & RSLT_VLD));
+
+        msm_uport = container_of(cmd_ptr, struct msm_hs_port, tx.xfer);
+
+        spin_lock_irqsave(&msm_uport->uport.lock, flags);
+        clk_enable(msm_uport->clk);
+
+        msm_uport->imr_reg |= UARTDM_ISR_TX_READY_BMSK;
+        msm_hs_write(&msm_uport->uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+        clk_disable(msm_uport->clk);
+        spin_unlock_irqrestore(&msm_uport->uport.lock, flags);
+}
+
+/*
+ * This routine is called when we are done with a DMA transfer or the
+ * a flush has been sent to the data mover driver.
+ *
+ * This routine is registered with Data mover when we set up a Data Mover
+ *  transfer. It is called from Data mover ISR when the DMA transfer is done.
+ */
+static void msm_hs_dmov_rx_callback(struct msm_dmov_cmd *cmd_ptr,
+                                        unsigned int result,
+                                        struct msm_dmov_errdata *err)
+{
+        int retval;
+        int rx_count;
+        unsigned long status;
+        unsigned int error_f = 0;
+        unsigned long flags;
+        unsigned int flush;
+        struct tty_struct *tty;
+        struct uart_port *uport;
+        struct msm_hs_port *msm_uport;
+
+        msm_uport = container_of(cmd_ptr, struct msm_hs_port, rx.xfer);
+        uport = &msm_uport->uport;
+
+        spin_lock_irqsave(&uport->lock, flags);
+        clk_enable(msm_uport->clk);
+
+        tty = uport->state->port.tty;
+
+        msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_DISABLE);
+
+        status = msm_hs_read(uport, UARTDM_SR_ADDR);
+
+        /* overflow is not connect to data in a FIFO */
+        if (unlikely((status & UARTDM_SR_OVERRUN_BMSK) &&
+                     (uport->read_status_mask & CREAD))) {
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                uport->icount.buf_overrun++;
+                error_f = 1;
+        }
+
+        if (!(uport->ignore_status_mask & INPCK))
+                status = status & ~(UARTDM_SR_PAR_FRAME_BMSK);
+
+        if (unlikely(status & UARTDM_SR_PAR_FRAME_BMSK)) {
+                /* Can not tell difference between parity & frame error */
+                uport->icount.parity++;
+                error_f = 1;
+                if (uport->ignore_status_mask & IGNPAR)
+                        tty_insert_flip_char(tty, 0, TTY_PARITY);
+        }
+
+        if (error_f)
+                msm_hs_write(uport, UARTDM_CR_ADDR, RESET_ERROR_STATUS);
+
+        if (msm_uport->clk_req_off_state == CLK_REQ_OFF_FLUSH_ISSUED)
+                msm_uport->clk_req_off_state = CLK_REQ_OFF_RXSTALE_FLUSHED;
+
+        flush = msm_uport->rx.flush;
+        if (flush == FLUSH_IGNORE)
+                msm_hs_start_rx_locked(uport);
+        if (flush == FLUSH_STOP)
+                msm_uport->rx.flush = FLUSH_SHUTDOWN;
+        if (flush >= FLUSH_DATA_INVALID)
+                goto out;
+
+        rx_count = msm_hs_read(uport, UARTDM_RX_TOTAL_SNAP_ADDR);
+
+        if (0 != (uport->read_status_mask & CREAD)) {
+                retval = tty_insert_flip_string(tty, msm_uport->rx.buffer,
+                                                rx_count);
+                BUG_ON(retval != rx_count);
+        }
+
+        msm_hs_start_rx_locked(uport);
+
+out:
+        clk_disable(msm_uport->clk);
+
+        spin_unlock_irqrestore(&uport->lock, flags);
+
+        if (flush < FLUSH_DATA_INVALID)
+                queue_work(msm_hs_workqueue, &msm_uport->rx.tty_work);
+}
+
+static void msm_hs_tty_flip_buffer_work(struct work_struct *work)
+{
+        struct msm_hs_port *msm_uport =
+                        container_of(work, struct msm_hs_port, rx.tty_work);
+        struct tty_struct *tty = msm_uport->uport.state->port.tty;
+
+        tty_flip_buffer_push(tty);
+}
+
+/*
+ *  Standard API, Current states of modem control inputs
+ *
+ * Since CTS can be handled entirely by HARDWARE we always
+ * indicate clear to send and count on the TX FIFO to block when
+ * it fills up.
+ *
+ * - TIOCM_DCD
+ * - TIOCM_CTS
+ * - TIOCM_DSR
+ * - TIOCM_RI
+ *  (Unsupported) DCD and DSR will return them high. RI will return low.
+ */
+static unsigned int msm_hs_get_mctrl_locked(struct uart_port *uport)
+{
+        return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
+}
+
+/*
+ * True enables UART auto RFR, which indicates we are ready for data if the RX
+ * buffer is not full. False disables auto RFR, and deasserts RFR to indicate
+ * we are not ready for data. Must be called with UART clock on.
+ */
+static void set_rfr_locked(struct uart_port *uport, int auto_rfr)
+{
+        unsigned int data;
+
+        data = msm_hs_read(uport, UARTDM_MR1_ADDR);
+
+        if (auto_rfr) {
+                /* enable auto ready-for-receiving */
+                data |= UARTDM_MR1_RX_RDY_CTL_BMSK;
+                msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+        } else {
+                /* disable auto ready-for-receiving */
+                data &= ~UARTDM_MR1_RX_RDY_CTL_BMSK;
+                msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+                /* RFR is active low, set high */
+                msm_hs_write(uport, UARTDM_CR_ADDR, RFR_HIGH);
+        }
+}
+
+/*
+ *  Standard API, used to set or clear RFR
+ */
+static void msm_hs_set_mctrl_locked(struct uart_port *uport,
+                                    unsigned int mctrl)
+{
+        unsigned int auto_rfr;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        clk_enable(msm_uport->clk);
+
+        auto_rfr = TIOCM_RTS & mctrl ? 1 : 0;
+        set_rfr_locked(uport, auto_rfr);
+
+        clk_disable(msm_uport->clk);
+}
+
+/* Standard API, Enable modem status (CTS) interrupt  */
+static void msm_hs_enable_ms_locked(struct uart_port *uport)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        clk_enable(msm_uport->clk);
+
+        /* Enable DELTA_CTS Interrupt */
+        msm_uport->imr_reg |= UARTDM_ISR_DELTA_CTS_BMSK;
+        msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+        clk_disable(msm_uport->clk);
+
+}
+
+/*
+ *  Standard API, Break Signal
+ *
+ * Control the transmission of a break signal. ctl eq 0 => break
+ * signal terminate ctl ne 0 => start break signal
+ */
+static void msm_hs_break_ctl(struct uart_port *uport, int ctl)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        clk_enable(msm_uport->clk);
+        msm_hs_write(uport, UARTDM_CR_ADDR, ctl ? START_BREAK : STOP_BREAK);
+        clk_disable(msm_uport->clk);
+}
+
+static void msm_hs_config_port(struct uart_port *uport, int cfg_flags)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&uport->lock, flags);
+        if (cfg_flags & UART_CONFIG_TYPE) {
+                uport->type = PORT_MSM;
+                msm_hs_request_port(uport);
+        }
+        spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+/*  Handle CTS changes (Called from interrupt handler) */
+static void msm_hs_handle_delta_cts(struct uart_port *uport)
+{
+        unsigned long flags;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        spin_lock_irqsave(&uport->lock, flags);
+        clk_enable(msm_uport->clk);
+
+        /* clear interrupt */
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_CTS);
+        uport->icount.cts++;
+
+        clk_disable(msm_uport->clk);
+        spin_unlock_irqrestore(&uport->lock, flags);
+
+        /* clear the IOCTL TIOCMIWAIT if called */
+        wake_up_interruptible(&uport->state->port.delta_msr_wait);
+}
+
+/* check if the TX path is flushed, and if so clock off
+ * returns 0 did not clock off, need to retry (still sending final byte)
+ *        -1 did not clock off, do not retry
+ *         1 if we clocked off
+ */
+static int msm_hs_check_clock_off_locked(struct uart_port *uport)
+{
+        unsigned long sr_status;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+        struct circ_buf *tx_buf = &uport->state->xmit;
+
+        /* Cancel if tx tty buffer is not empty, dma is in flight,
+         * or tx fifo is not empty, or rx fifo is not empty */
+        if (msm_uport->clk_state != MSM_HS_CLK_REQUEST_OFF ||
+            !uart_circ_empty(tx_buf) || msm_uport->tx.dma_in_flight ||
+            (msm_uport->imr_reg & UARTDM_ISR_TXLEV_BMSK) ||
+            !(msm_uport->imr_reg & UARTDM_ISR_RXLEV_BMSK))  {
+                return -1;
+        }
+
+        /* Make sure the uart is finished with the last byte */
+        sr_status = msm_hs_read(uport, UARTDM_SR_ADDR);
+        if (!(sr_status & UARTDM_SR_TXEMT_BMSK))
+                return 0;  /* retry */
+
+        /* Make sure forced RXSTALE flush complete */
+        switch (msm_uport->clk_req_off_state) {
+        case CLK_REQ_OFF_START:
+                msm_uport->clk_req_off_state = CLK_REQ_OFF_RXSTALE_ISSUED;
+                msm_hs_write(uport, UARTDM_CR_ADDR, FORCE_STALE_EVENT);
+                return 0;  /* RXSTALE flush not complete - retry */
+        case CLK_REQ_OFF_RXSTALE_ISSUED:
+        case CLK_REQ_OFF_FLUSH_ISSUED:
+                return 0;  /* RXSTALE flush not complete - retry */
+        case CLK_REQ_OFF_RXSTALE_FLUSHED:
+                break;  /* continue */
+        }
+
+        if (msm_uport->rx.flush != FLUSH_SHUTDOWN) {
+                if (msm_uport->rx.flush == FLUSH_NONE)
+                        msm_hs_stop_rx_locked(uport);
+                return 0;  /* come back later to really clock off */
+        }
+
+        /* we really want to clock off */
+        clk_disable(msm_uport->clk);
+        msm_uport->clk_state = MSM_HS_CLK_OFF;
+
+        if (use_low_power_rx_wakeup(msm_uport)) {
+                msm_uport->rx_wakeup.ignore = 1;
+                enable_irq(msm_uport->rx_wakeup.irq);
+        }
+        return 1;
+}
+
+static enum hrtimer_restart msm_hs_clk_off_retry(struct hrtimer *timer)
+{
+        unsigned long flags;
+        int ret = HRTIMER_NORESTART;
+        struct msm_hs_port *msm_uport = container_of(timer, struct msm_hs_port,
+                                                     clk_off_timer);
+        struct uart_port *uport = &msm_uport->uport;
+
+        spin_lock_irqsave(&uport->lock, flags);
+
+        if (!msm_hs_check_clock_off_locked(uport)) {
+                hrtimer_forward_now(timer, msm_uport->clk_off_delay);
+                ret = HRTIMER_RESTART;
+        }
+
+        spin_unlock_irqrestore(&uport->lock, flags);
+
+        return ret;
+}
+
+static irqreturn_t msm_hs_isr(int irq, void *dev)
+{
+        unsigned long flags;
+        unsigned long isr_status;
+        struct msm_hs_port *msm_uport = dev;
+        struct uart_port *uport = &msm_uport->uport;
+        struct circ_buf *tx_buf = &uport->state->xmit;
+        struct msm_hs_tx *tx = &msm_uport->tx;
+        struct msm_hs_rx *rx = &msm_uport->rx;
+
+        spin_lock_irqsave(&uport->lock, flags);
+
+        isr_status = msm_hs_read(uport, UARTDM_MISR_ADDR);
+
+        /* Uart RX starting */
+        if (isr_status & UARTDM_ISR_RXLEV_BMSK) {
+                msm_uport->imr_reg &= ~UARTDM_ISR_RXLEV_BMSK;
+                msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+        }
+        /* Stale rx interrupt */
+        if (isr_status & UARTDM_ISR_RXSTALE_BMSK) {
+                msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_DISABLE);
+                msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT);
+
+                if (msm_uport->clk_req_off_state == CLK_REQ_OFF_RXSTALE_ISSUED)
+                        msm_uport->clk_req_off_state =
+                                        CLK_REQ_OFF_FLUSH_ISSUED;
+                if (rx->flush == FLUSH_NONE) {
+                        rx->flush = FLUSH_DATA_READY;
+                        msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1);
+                }
+        }
+        /* tx ready interrupt */
+        if (isr_status & UARTDM_ISR_TX_READY_BMSK) {
+                /* Clear  TX Ready */
+                msm_hs_write(uport, UARTDM_CR_ADDR, CLEAR_TX_READY);
+
+                if (msm_uport->clk_state == MSM_HS_CLK_REQUEST_OFF) {
+                        msm_uport->imr_reg |= UARTDM_ISR_TXLEV_BMSK;
+                        msm_hs_write(uport, UARTDM_IMR_ADDR,
+                                     msm_uport->imr_reg);
+                }
+
+                /* Complete DMA TX transactions and submit new transactions */
+                tx_buf->tail = (tx_buf->tail + tx->tx_count) & ~UART_XMIT_SIZE;
+
+                tx->dma_in_flight = 0;
+
+                uport->icount.tx += tx->tx_count;
+                if (tx->tx_ready_int_en)
+                        msm_hs_submit_tx_locked(uport);
+
+                if (uart_circ_chars_pending(tx_buf) < WAKEUP_CHARS)
+                        uart_write_wakeup(uport);
+        }
+        if (isr_status & UARTDM_ISR_TXLEV_BMSK) {
+                /* TX FIFO is empty */
+                msm_uport->imr_reg &= ~UARTDM_ISR_TXLEV_BMSK;
+                msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+                if (!msm_hs_check_clock_off_locked(uport))
+                        hrtimer_start(&msm_uport->clk_off_timer,
+                                      msm_uport->clk_off_delay,
+                                      HRTIMER_MODE_REL);
+        }
+
+        /* Change in CTS interrupt */
+        if (isr_status & UARTDM_ISR_DELTA_CTS_BMSK)
+                msm_hs_handle_delta_cts(uport);
+
+        spin_unlock_irqrestore(&uport->lock, flags);
+
+        return IRQ_HANDLED;
+}
+
+void msm_hs_request_clock_off_locked(struct uart_port *uport)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        if (msm_uport->clk_state == MSM_HS_CLK_ON) {
+                msm_uport->clk_state = MSM_HS_CLK_REQUEST_OFF;
+                msm_uport->clk_req_off_state = CLK_REQ_OFF_START;
+                if (!use_low_power_rx_wakeup(msm_uport))
+                        set_rfr_locked(uport, 0);
+                msm_uport->imr_reg |= UARTDM_ISR_TXLEV_BMSK;
+                msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+        }
+}
+
+/**
+ * msm_hs_request_clock_off - request to (i.e. asynchronously) turn off uart
+ * clock once pending TX is flushed and Rx DMA command is terminated.
+ * @uport: uart_port structure for the device instance.
+ *
+ * This functions puts the device into a partially active low power mode. It
+ * waits to complete all pending tx transactions, flushes ongoing Rx DMA
+ * command and terminates UART side Rx transaction, puts UART HW in non DMA
+ * mode and then clocks off the device. A client calls this when no UART
+ * data is expected. msm_request_clock_on() must be called before any further
+ * UART can be sent or received.
+ */
+void msm_hs_request_clock_off(struct uart_port *uport)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&uport->lock, flags);
+        msm_hs_request_clock_off_locked(uport);
+        spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+void msm_hs_request_clock_on_locked(struct uart_port *uport)
+{
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+        unsigned int data;
+
+        switch (msm_uport->clk_state) {
+        case MSM_HS_CLK_OFF:
+                clk_enable(msm_uport->clk);
+                disable_irq_nosync(msm_uport->rx_wakeup.irq);
+                /* fall-through */
+        case MSM_HS_CLK_REQUEST_OFF:
+                if (msm_uport->rx.flush == FLUSH_STOP ||
+                    msm_uport->rx.flush == FLUSH_SHUTDOWN) {
+                        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX);
+                        data = msm_hs_read(uport, UARTDM_DMEN_ADDR);
+                        data |= UARTDM_RX_DM_EN_BMSK;
+                        msm_hs_write(uport, UARTDM_DMEN_ADDR, data);
+                }
+                hrtimer_try_to_cancel(&msm_uport->clk_off_timer);
+                if (msm_uport->rx.flush == FLUSH_SHUTDOWN)
+                        msm_hs_start_rx_locked(uport);
+                if (!use_low_power_rx_wakeup(msm_uport))
+                        set_rfr_locked(uport, 1);
+                if (msm_uport->rx.flush == FLUSH_STOP)
+                        msm_uport->rx.flush = FLUSH_IGNORE;
+                msm_uport->clk_state = MSM_HS_CLK_ON;
+                break;
+        case MSM_HS_CLK_ON:
+                break;
+        case MSM_HS_CLK_PORT_OFF:
+                break;
+        }
+}
+
+/**
+ * msm_hs_request_clock_on - Switch the device from partially active low
+ * power mode to fully active (i.e. clock on) mode.
+ * @uport: uart_port structure for the device.
+ *
+ * This function switches on the input clock, puts UART HW into DMA mode
+ * and enqueues an Rx DMA command if the device was in partially active
+ * mode. It has no effect if called with the device in inactive state.
+ */
+void msm_hs_request_clock_on(struct uart_port *uport)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&uport->lock, flags);
+        msm_hs_request_clock_on_locked(uport);
+        spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+static irqreturn_t msm_hs_rx_wakeup_isr(int irq, void *dev)
+{
+        unsigned int wakeup = 0;
+        unsigned long flags;
+        struct msm_hs_port *msm_uport = dev;
+        struct uart_port *uport = &msm_uport->uport;
+        struct tty_struct *tty = NULL;
+
+        spin_lock_irqsave(&uport->lock, flags);
+        if (msm_uport->clk_state == MSM_HS_CLK_OFF) {
+                /* ignore the first irq - it is a pending irq that occurred
+                 * before enable_irq() */
+                if (msm_uport->rx_wakeup.ignore)
+                        msm_uport->rx_wakeup.ignore = 0;
+                else
+                        wakeup = 1;
+        }
+
+        if (wakeup) {
+                /* the uart was clocked off during an rx, wake up and
+                 * optionally inject char into tty rx */
+                msm_hs_request_clock_on_locked(uport);
+                if (msm_uport->rx_wakeup.inject_rx) {
+                        tty = uport->state->port.tty;
+                        tty_insert_flip_char(tty,
+                                             msm_uport->rx_wakeup.rx_to_inject,
+                                             TTY_NORMAL);
+                        queue_work(msm_hs_workqueue, &msm_uport->rx.tty_work);
+                }
+        }
+
+        spin_unlock_irqrestore(&uport->lock, flags);
+
+        return IRQ_HANDLED;
+}
+
+static const char *msm_hs_type(struct uart_port *port)
+{
+        return (port->type == PORT_MSM) ? "MSM_HS_UART" : NULL;
+}
+
+/* Called when port is opened */
+static int msm_hs_startup(struct uart_port *uport)
+{
+        int ret;
+        int rfr_level;
+        unsigned long flags;
+        unsigned int data;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+        struct circ_buf *tx_buf = &uport->state->xmit;
+        struct msm_hs_tx *tx = &msm_uport->tx;
+        struct msm_hs_rx *rx = &msm_uport->rx;
+
+        rfr_level = uport->fifosize;
+        if (rfr_level > 16)
+                rfr_level -= 16;
+
+        tx->dma_base = dma_map_single(uport->dev, tx_buf->buf, UART_XMIT_SIZE,
+                                      DMA_TO_DEVICE);
+
+        /* do not let tty layer execute RX in global workqueue, use a
+         * dedicated workqueue managed by this driver */
+        uport->state->port.tty->low_latency = 1;
+
+        /* turn on uart clk */
+        ret = msm_hs_init_clk_locked(uport);
+        if (unlikely(ret)) {
+                printk(KERN_ERR "Turning uartclk failed!\n");
+                goto err_msm_hs_init_clk;
+        }
+
+        /* Set auto RFR Level */
+        data = msm_hs_read(uport, UARTDM_MR1_ADDR);
+        data &= ~UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK;
+        data &= ~UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK;
+        data |= (UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK & (rfr_level << 2));
+        data |= (UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK & rfr_level);
+        msm_hs_write(uport, UARTDM_MR1_ADDR, data);
+
+        /* Make sure RXSTALE count is non-zero */
+        data = msm_hs_read(uport, UARTDM_IPR_ADDR);
+        if (!data) {
+                data |= 0x1f & UARTDM_IPR_STALE_LSB_BMSK;
+                msm_hs_write(uport, UARTDM_IPR_ADDR, data);
+        }
+
+        /* Enable Data Mover Mode */
+        data = UARTDM_TX_DM_EN_BMSK | UARTDM_RX_DM_EN_BMSK;
+        msm_hs_write(uport, UARTDM_DMEN_ADDR, data);
+
+        /* Reset TX */
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_TX);
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX);
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_ERROR_STATUS);
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_BREAK_INT);
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT);
+        msm_hs_write(uport, UARTDM_CR_ADDR, RESET_CTS);
+        msm_hs_write(uport, UARTDM_CR_ADDR, RFR_LOW);
+        /* Turn on Uart Receiver */
+        msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_RX_EN_BMSK);
+
+        /* Turn on Uart Transmitter */
+        msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_TX_EN_BMSK);
+
+        /* Initialize the tx */
+        tx->tx_ready_int_en = 0;
+        tx->dma_in_flight = 0;
+
+        tx->xfer.complete_func = msm_hs_dmov_tx_callback;
+        tx->xfer.execute_func = NULL;
+
+        tx->command_ptr->cmd = CMD_LC |
+            CMD_DST_CRCI(msm_uport->dma_tx_crci) | CMD_MODE_BOX;
+
+        tx->command_ptr->src_dst_len = (MSM_UARTDM_BURST_SIZE << 16)
+                                           | (MSM_UARTDM_BURST_SIZE);
+
+        tx->command_ptr->row_offset = (MSM_UARTDM_BURST_SIZE << 16);
+
+        tx->command_ptr->dst_row_addr =
+            msm_uport->uport.mapbase + UARTDM_TF_ADDR;
+
+
+        /* Turn on Uart Receive */
+        rx->xfer.complete_func = msm_hs_dmov_rx_callback;
+        rx->xfer.execute_func = NULL;
+
+        rx->command_ptr->cmd = CMD_LC |
+            CMD_SRC_CRCI(msm_uport->dma_rx_crci) | CMD_MODE_BOX;
+
+        rx->command_ptr->src_dst_len = (MSM_UARTDM_BURST_SIZE << 16)
+                                           | (MSM_UARTDM_BURST_SIZE);
+        rx->command_ptr->row_offset =  MSM_UARTDM_BURST_SIZE;
+        rx->command_ptr->src_row_addr = uport->mapbase + UARTDM_RF_ADDR;
+
+
+        msm_uport->imr_reg |= UARTDM_ISR_RXSTALE_BMSK;
+        /* Enable reading the current CTS, no harm even if CTS is ignored */
+        msm_uport->imr_reg |= UARTDM_ISR_CURRENT_CTS_BMSK;
+
+        msm_hs_write(uport, UARTDM_TFWR_ADDR, 0);  /* TXLEV on empty TX fifo */
+
+
+        ret = request_irq(uport->irq, msm_hs_isr, IRQF_TRIGGER_HIGH,
+                          "msm_hs_uart", msm_uport);
+        if (unlikely(ret)) {
+                printk(KERN_ERR "Request msm_hs_uart IRQ failed!\n");
+                goto err_request_irq;
+        }
+        if (use_low_power_rx_wakeup(msm_uport)) {
+                ret = request_irq(msm_uport->rx_wakeup.irq,
+                                  msm_hs_rx_wakeup_isr,
+                                  IRQF_TRIGGER_FALLING,
+                                  "msm_hs_rx_wakeup", msm_uport);
+                if (unlikely(ret)) {
+                        printk(KERN_ERR "Request msm_hs_rx_wakeup IRQ failed!\n");
+                        free_irq(uport->irq, msm_uport);
+                        goto err_request_irq;
+                }
+                disable_irq(msm_uport->rx_wakeup.irq);
+        }
+
+        spin_lock_irqsave(&uport->lock, flags);
+
+        msm_hs_write(uport, UARTDM_RFWR_ADDR, 0);
+        msm_hs_start_rx_locked(uport);
+
+        spin_unlock_irqrestore(&uport->lock, flags);
+        ret = pm_runtime_set_active(uport->dev);
+        if (ret)
+                dev_err(uport->dev, "set active error:%d\n", ret);
+        pm_runtime_enable(uport->dev);
+
+        return 0;
+
+err_request_irq:
+err_msm_hs_init_clk:
+        dma_unmap_single(uport->dev, tx->dma_base,
+                                UART_XMIT_SIZE, DMA_TO_DEVICE);
+        return ret;
+}
+
+/* Initialize tx and rx data structures */
+static int __devinit uartdm_init_port(struct uart_port *uport)
+{
+        int ret = 0;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+        struct msm_hs_tx *tx = &msm_uport->tx;
+        struct msm_hs_rx *rx = &msm_uport->rx;
+
+        /* Allocate the command pointer. Needs to be 64 bit aligned */
+        tx->command_ptr = kmalloc(sizeof(dmov_box), GFP_KERNEL | __GFP_DMA);
+        if (!tx->command_ptr)
+                return -ENOMEM;
+
+        tx->command_ptr_ptr = kmalloc(sizeof(u32 *), GFP_KERNEL | __GFP_DMA);
+        if (!tx->command_ptr_ptr) {
+                ret = -ENOMEM;
+                goto err_tx_command_ptr_ptr;
+        }
+
+        tx->mapped_cmd_ptr = dma_map_single(uport->dev, tx->command_ptr,
+                                            sizeof(dmov_box), DMA_TO_DEVICE);
+        tx->mapped_cmd_ptr_ptr = dma_map_single(uport->dev,
+                                                tx->command_ptr_ptr,
+                                                sizeof(u32 *), DMA_TO_DEVICE);
+        tx->xfer.cmdptr = DMOV_CMD_ADDR(tx->mapped_cmd_ptr_ptr);
+
+        init_waitqueue_head(&rx->wait);
+
+        rx->pool = dma_pool_create("rx_buffer_pool", uport->dev,
+                                   UARTDM_RX_BUF_SIZE, 16, 0);
+        if (!rx->pool) {
+                pr_err("%s(): cannot allocate rx_buffer_pool", __func__);
+                ret = -ENOMEM;
+                goto err_dma_pool_create;
+        }
+
+        rx->buffer = dma_pool_alloc(rx->pool, GFP_KERNEL, &rx->rbuffer);
+        if (!rx->buffer) {
+                pr_err("%s(): cannot allocate rx->buffer", __func__);
+                ret = -ENOMEM;
+                goto err_dma_pool_alloc;
+        }
+
+        /* Allocate the command pointer. Needs to be 64 bit aligned */
+        rx->command_ptr = kmalloc(sizeof(dmov_box), GFP_KERNEL | __GFP_DMA);
+        if (!rx->command_ptr) {
+                pr_err("%s(): cannot allocate rx->command_ptr", __func__);
+                ret = -ENOMEM;
+                goto err_rx_command_ptr;
+        }
+
+        rx->command_ptr_ptr = kmalloc(sizeof(u32 *), GFP_KERNEL | __GFP_DMA);
+        if (!rx->command_ptr_ptr) {
+                pr_err("%s(): cannot allocate rx->command_ptr_ptr", __func__);
+                ret = -ENOMEM;
+                goto err_rx_command_ptr_ptr;
+        }
+
+        rx->command_ptr->num_rows = ((UARTDM_RX_BUF_SIZE >> 4) << 16) |
+                                         (UARTDM_RX_BUF_SIZE >> 4);
+
+        rx->command_ptr->dst_row_addr = rx->rbuffer;
+
+        rx->mapped_cmd_ptr = dma_map_single(uport->dev, rx->command_ptr,
+                                            sizeof(dmov_box), DMA_TO_DEVICE);
+
+        *rx->command_ptr_ptr = CMD_PTR_LP | DMOV_CMD_ADDR(rx->mapped_cmd_ptr);
+
+        rx->cmdptr_dmaaddr = dma_map_single(uport->dev, rx->command_ptr_ptr,
+                                            sizeof(u32 *), DMA_TO_DEVICE);
+        rx->xfer.cmdptr = DMOV_CMD_ADDR(rx->cmdptr_dmaaddr);
+
+        INIT_WORK(&rx->tty_work, msm_hs_tty_flip_buffer_work);
+
+        return ret;
+
+err_rx_command_ptr_ptr:
+        kfree(rx->command_ptr);
+err_rx_command_ptr:
+        dma_pool_free(msm_uport->rx.pool, msm_uport->rx.buffer,
+                                                msm_uport->rx.rbuffer);
+err_dma_pool_alloc:
+        dma_pool_destroy(msm_uport->rx.pool);
+err_dma_pool_create:
+        dma_unmap_single(uport->dev, msm_uport->tx.mapped_cmd_ptr_ptr,
+                                sizeof(u32 *), DMA_TO_DEVICE);
+        dma_unmap_single(uport->dev, msm_uport->tx.mapped_cmd_ptr,
+                                sizeof(dmov_box), DMA_TO_DEVICE);
+        kfree(msm_uport->tx.command_ptr_ptr);
+err_tx_command_ptr_ptr:
+        kfree(msm_uport->tx.command_ptr);
+        return ret;
+}
+
+static int __devinit msm_hs_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct uart_port *uport;
+        struct msm_hs_port *msm_uport;
+        struct resource *resource;
+        const struct msm_serial_hs_platform_data *pdata =
+                                                pdev->dev.platform_data;
+
+        if (pdev->id < 0 || pdev->id >= UARTDM_NR) {
+                printk(KERN_ERR "Invalid plaform device ID = %d\n", pdev->id);
+                return -EINVAL;
+        }
+
+        msm_uport = &q_uart_port[pdev->id];
+        uport = &msm_uport->uport;
+
+        uport->dev = &pdev->dev;
+
+        resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (unlikely(!resource))
+                return -ENXIO;
+
+        uport->mapbase = resource->start;
+        uport->irq = platform_get_irq(pdev, 0);
+        if (unlikely(uport->irq < 0))
+                return -ENXIO;
+
+        if (unlikely(irq_set_irq_wake(uport->irq, 1)))
+                return -ENXIO;
+
+        if (pdata == NULL || pdata->rx_wakeup_irq < 0)
+                msm_uport->rx_wakeup.irq = -1;
+        else {
+                msm_uport->rx_wakeup.irq = pdata->rx_wakeup_irq;
+                msm_uport->rx_wakeup.ignore = 1;
+                msm_uport->rx_wakeup.inject_rx = pdata->inject_rx_on_wakeup;
+                msm_uport->rx_wakeup.rx_to_inject = pdata->rx_to_inject;
+
+                if (unlikely(msm_uport->rx_wakeup.irq < 0))
+                        return -ENXIO;
+
+                if (unlikely(irq_set_irq_wake(msm_uport->rx_wakeup.irq, 1)))
+                        return -ENXIO;
+        }
+
+        if (pdata == NULL)
+                msm_uport->exit_lpm_cb = NULL;
+        else
+                msm_uport->exit_lpm_cb = pdata->exit_lpm_cb;
+
+        resource = platform_get_resource_byname(pdev, IORESOURCE_DMA,
+                                                "uartdm_channels");
+        if (unlikely(!resource))
+                return -ENXIO;
+
+        msm_uport->dma_tx_channel = resource->start;
+        msm_uport->dma_rx_channel = resource->end;
+
+        resource = platform_get_resource_byname(pdev, IORESOURCE_DMA,
+                                                "uartdm_crci");
+        if (unlikely(!resource))
+                return -ENXIO;
+
+        msm_uport->dma_tx_crci = resource->start;
+        msm_uport->dma_rx_crci = resource->end;
+
+        uport->iotype = UPIO_MEM;
+        uport->fifosize = UART_FIFOSIZE;
+        uport->ops = &msm_hs_ops;
+        uport->flags = UPF_BOOT_AUTOCONF;
+        uport->uartclk = UARTCLK;
+        msm_uport->imr_reg = 0x0;
+        msm_uport->clk = clk_get(&pdev->dev, "uartdm_clk");
+        if (IS_ERR(msm_uport->clk))
+                return PTR_ERR(msm_uport->clk);
+
+        ret = uartdm_init_port(uport);
+        if (unlikely(ret))
+                return ret;
+
+        msm_uport->clk_state = MSM_HS_CLK_PORT_OFF;
+        hrtimer_init(&msm_uport->clk_off_timer, CLOCK_MONOTONIC,
+                     HRTIMER_MODE_REL);
+        msm_uport->clk_off_timer.function = msm_hs_clk_off_retry;
+        msm_uport->clk_off_delay = ktime_set(0, 1000000);  /* 1ms */
+
+        uport->line = pdev->id;
+        return uart_add_one_port(&msm_hs_driver, uport);
+}
+
+static int __init msm_serial_hs_init(void)
+{
+        int ret, i;
+
+        /* Init all UARTS as non-configured */
+        for (i = 0; i < UARTDM_NR; i++)
+                q_uart_port[i].uport.type = PORT_UNKNOWN;
+
+        msm_hs_workqueue = create_singlethread_workqueue("msm_serial_hs");
+        if (unlikely(!msm_hs_workqueue))
+                return -ENOMEM;
+
+        ret = uart_register_driver(&msm_hs_driver);
+        if (unlikely(ret)) {
+                printk(KERN_ERR "%s failed to load\n", __func__);
+                goto err_uart_register_driver;
+        }
+
+        ret = platform_driver_register(&msm_serial_hs_platform_driver);
+        if (ret) {
+                printk(KERN_ERR "%s failed to load\n", __func__);
+                goto err_platform_driver_register;
+        }
+
+        return ret;
+
+err_platform_driver_register:
+        uart_unregister_driver(&msm_hs_driver);
+err_uart_register_driver:
+        destroy_workqueue(msm_hs_workqueue);
+        return ret;
+}
+module_init(msm_serial_hs_init);
+
+/*
+ *  Called by the upper layer when port is closed.
+ *     - Disables the port
+ *     - Unhook the ISR
+ */
+static void msm_hs_shutdown(struct uart_port *uport)
+{
+        unsigned long flags;
+        struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);
+
+        BUG_ON(msm_uport->rx.flush < FLUSH_STOP);
+
+        spin_lock_irqsave(&uport->lock, flags);
+        clk_enable(msm_uport->clk);
+
+        /* Disable the transmitter */
+        msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_TX_DISABLE_BMSK);
+        /* Disable the receiver */
+        msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_RX_DISABLE_BMSK);
+
+        pm_runtime_disable(uport->dev);
+        pm_runtime_set_suspended(uport->dev);
+
+        /* Free the interrupt */
+        free_irq(uport->irq, msm_uport);
+        if (use_low_power_rx_wakeup(msm_uport))
+                free_irq(msm_uport->rx_wakeup.irq, msm_uport);
+
+        msm_uport->imr_reg = 0;
+        msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg);
+
+        wait_event(msm_uport->rx.wait, msm_uport->rx.flush == FLUSH_SHUTDOWN);
+
+        clk_disable(msm_uport->clk);  /* to balance local clk_enable() */
+        if (msm_uport->clk_state != MSM_HS_CLK_OFF)
+                clk_disable(msm_uport->clk);  /* to balance clk_state */
+        msm_uport->clk_state = MSM_HS_CLK_PORT_OFF;
+
+        dma_unmap_single(uport->dev, msm_uport->tx.dma_base,
+                         UART_XMIT_SIZE, DMA_TO_DEVICE);
+
+        spin_unlock_irqrestore(&uport->lock, flags);
+
+        if (cancel_work_sync(&msm_uport->rx.tty_work))
+                msm_hs_tty_flip_buffer_work(&msm_uport->rx.tty_work);
+}
+
+static void __exit msm_serial_hs_exit(void)
+{
+        flush_workqueue(msm_hs_workqueue);
+        destroy_workqueue(msm_hs_workqueue);
+        platform_driver_unregister(&msm_serial_hs_platform_driver);
+        uart_unregister_driver(&msm_hs_driver);
+}
+module_exit(msm_serial_hs_exit);
+
+#ifdef CONFIG_PM_RUNTIME
+static int msm_hs_runtime_idle(struct device *dev)
+{
+        /*
+         * returning success from idle results in runtime suspend to be
+         * called
+         */
+        return 0;
+}
+
+static int msm_hs_runtime_resume(struct device *dev)
+{
+        struct platform_device *pdev = container_of(dev, struct
+                                                    platform_device, dev);
+        struct msm_hs_port *msm_uport = &q_uart_port[pdev->id];
+
+        msm_hs_request_clock_on(&msm_uport->uport);
+        return 0;
+}
+
+static int msm_hs_runtime_suspend(struct device *dev)
+{
+        struct platform_device *pdev = container_of(dev, struct
+                                                    platform_device, dev);
+        struct msm_hs_port *msm_uport = &q_uart_port[pdev->id];
+
+        msm_hs_request_clock_off(&msm_uport->uport);
+        return 0;
+}
+#else
+#define msm_hs_runtime_idle NULL
+#define msm_hs_runtime_resume NULL
+#define msm_hs_runtime_suspend NULL
+#endif
+
+static const struct dev_pm_ops msm_hs_dev_pm_ops = {
+        .runtime_suspend = msm_hs_runtime_suspend,
+        .runtime_resume  = msm_hs_runtime_resume,
+        .runtime_idle    = msm_hs_runtime_idle,
+};
+
+static struct platform_driver msm_serial_hs_platform_driver = {
+        .probe = msm_hs_probe,
+        .remove = __devexit_p(msm_hs_remove),
+        .driver = {
+                .name = "msm_serial_hs",
+                .owner = THIS_MODULE,
+                .pm   = &msm_hs_dev_pm_ops,
+        },
+};
+
+static struct uart_driver msm_hs_driver = {
+        .owner = THIS_MODULE,
+        .driver_name = "msm_serial_hs",
+        .dev_name = "ttyHS",
+        .nr = UARTDM_NR,
+        .cons = 0,
+};
+
+static struct uart_ops msm_hs_ops = {
+        .tx_empty = msm_hs_tx_empty,
+        .set_mctrl = msm_hs_set_mctrl_locked,
+        .get_mctrl = msm_hs_get_mctrl_locked,
+        .stop_tx = msm_hs_stop_tx_locked,
+        .start_tx = msm_hs_start_tx_locked,
+        .stop_rx = msm_hs_stop_rx_locked,
+        .enable_ms = msm_hs_enable_ms_locked,
+        .break_ctl = msm_hs_break_ctl,
+        .startup = msm_hs_startup,
+        .shutdown = msm_hs_shutdown,
+        .set_termios = msm_hs_set_termios,
+        .pm = msm_hs_pm,
+        .type = msm_hs_type,
+        .config_port = msm_hs_config_port,
+        .release_port = msm_hs_release_port,
+        .request_port = msm_hs_request_port,
+};
+
+MODULE_DESCRIPTION("High Speed UART Driver for the MSM chipset");
+MODULE_VERSION("1.2");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/msm_smd_tty.c b/drivers/tty/serial/msm_smd_tty.c
new file mode 100644
index 000000000000..4f41dcdcb771
--- /dev/null
+++ b/drivers/tty/serial/msm_smd_tty.c
@@ -0,0 +1,235 @@
+/*
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+
+#include <mach/msm_smd.h>
+
+#define MAX_SMD_TTYS 32
+
+struct smd_tty_info {
+        struct tty_port port;
+        smd_channel_t *ch;
+};
+
+struct smd_tty_channel_desc {
+        int id;
+        const char *name;
+};
+
+static struct smd_tty_info smd_tty[MAX_SMD_TTYS];
+
+static const struct smd_tty_channel_desc smd_default_tty_channels[] = {
+        { .id = 0, .name = "SMD_DS" },
+        { .id = 27, .name = "SMD_GPSNMEA" },
+};
+
+static const struct smd_tty_channel_desc *smd_tty_channels =
+                smd_default_tty_channels;
+static int smd_tty_channels_len = ARRAY_SIZE(smd_default_tty_channels);
+
+static void smd_tty_notify(void *priv, unsigned event)
+{
+        unsigned char *ptr;
+        int avail;
+        struct smd_tty_info *info = priv;
+        struct tty_struct *tty;
+
+        if (event != SMD_EVENT_DATA)
+                return;
+
+        tty = tty_port_tty_get(&info->port);
+        if (!tty)
+                return;
+
+        for (;;) {
+                if (test_bit(TTY_THROTTLED, &tty->flags))
+                        break;
+                avail = smd_read_avail(info->ch);
+                if (avail == 0)
+                        break;
+
+                avail = tty_prepare_flip_string(tty, &ptr, avail);
+
+                if (smd_read(info->ch, ptr, avail) != avail) {
+                        /* shouldn't be possible since we're in interrupt
+                        ** context here and nobody else could 'steal' our
+                        ** characters.
+                        */
+                        pr_err("OOPS - smd_tty_buffer mismatch?!");
+                }
+
+                tty_flip_buffer_push(tty);
+        }
+
+        /* XXX only when writable and necessary */
+        tty_wakeup(tty);
+        tty_kref_put(tty);
+}
+
+static int smd_tty_port_activate(struct tty_port *tport, struct tty_struct *tty)
+{
+        int i, res = 0;
+        int n = tty->index;
+        const char *name = NULL;
+        struct smd_tty_info *info = smd_tty + n;
+
+        for (i = 0; i < smd_tty_channels_len; i++) {
+                if (smd_tty_channels[i].id == n) {
+                        name = smd_tty_channels[i].name;
+                        break;
+                }
+        }
+        if (!name)
+                return -ENODEV;
+
+        if (info->ch)
+                smd_kick(info->ch);
+        else
+                res = smd_open(name, &info->ch, info, smd_tty_notify);
+
+        if (!res)
+                tty->driver_data = info;
+
+        return res;
+}
+
+static void smd_tty_port_shutdown(struct tty_port *tport)
+{
+        struct smd_tty_info *info;
+        struct tty_struct *tty = tty_port_tty_get(tport);
+
+        info = tty->driver_data;
+        if (info->ch) {
+                smd_close(info->ch);
+                info->ch = 0;
+        }
+
+        tty->driver_data = 0;
+        tty_kref_put(tty);
+}
+
+static int smd_tty_open(struct tty_struct *tty, struct file *f)
+{
+        struct smd_tty_info *info = smd_tty + tty->index;
+
+        return tty_port_open(&info->port, tty, f);
+}
+
+static void smd_tty_close(struct tty_struct *tty, struct file *f)
+{
+        struct smd_tty_info *info = tty->driver_data;
+
+        tty_port_close(&info->port, tty, f);
+}
+
+static int smd_tty_write(struct tty_struct *tty,
+                         const unsigned char *buf, int len)
+{
+        struct smd_tty_info *info = tty->driver_data;
+        int avail;
+
+        /* if we're writing to a packet channel we will
+        ** never be able to write more data than there
+        ** is currently space for
+        */
+        avail = smd_write_avail(info->ch);
+        if (len > avail)
+                len = avail;
+
+        return smd_write(info->ch, buf, len);
+}
+
+static int smd_tty_write_room(struct tty_struct *tty)
+{
+        struct smd_tty_info *info = tty->driver_data;
+        return smd_write_avail(info->ch);
+}
+
+static int smd_tty_chars_in_buffer(struct tty_struct *tty)
+{
+        struct smd_tty_info *info = tty->driver_data;
+        return smd_read_avail(info->ch);
+}
+
+static void smd_tty_unthrottle(struct tty_struct *tty)
+{
+        struct smd_tty_info *info = tty->driver_data;
+        smd_kick(info->ch);
+}
+
+static const struct tty_port_operations smd_tty_port_ops = {
+        .shutdown = smd_tty_port_shutdown,
+        .activate = smd_tty_port_activate,
+};
+
+static const struct tty_operations smd_tty_ops = {
+        .open = smd_tty_open,
+        .close = smd_tty_close,
+        .write = smd_tty_write,
+        .write_room = smd_tty_write_room,
+        .chars_in_buffer = smd_tty_chars_in_buffer,
+        .unthrottle = smd_tty_unthrottle,
+};
+
+static struct tty_driver *smd_tty_driver;
+
+static int __init smd_tty_init(void)
+{
+        int ret, i;
+
+        smd_tty_driver = alloc_tty_driver(MAX_SMD_TTYS);
+        if (smd_tty_driver == 0)
+                return -ENOMEM;
+
+        smd_tty_driver->owner = THIS_MODULE;
+        smd_tty_driver->driver_name = "smd_tty_driver";
+        smd_tty_driver->name = "smd";
+        smd_tty_driver->major = 0;
+        smd_tty_driver->minor_start = 0;
+        smd_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        smd_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+        smd_tty_driver->init_termios = tty_std_termios;
+        smd_tty_driver->init_termios.c_iflag = 0;
+        smd_tty_driver->init_termios.c_oflag = 0;
+        smd_tty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
+        smd_tty_driver->init_termios.c_lflag = 0;
+        smd_tty_driver->flags = TTY_DRIVER_RESET_TERMIOS |
+                TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        tty_set_operations(smd_tty_driver, &smd_tty_ops);
+
+        ret = tty_register_driver(smd_tty_driver);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < smd_tty_channels_len; i++) {
+                tty_port_init(&smd_tty[smd_tty_channels[i].id].port);
+                smd_tty[smd_tty_channels[i].id].port.ops = &smd_tty_port_ops;
+                tty_register_device(smd_tty_driver, smd_tty_channels[i].id, 0);
+        }
+
+        return 0;
+}
+
+module_init(smd_tty_init);
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
new file mode 100644
index 000000000000..9711e06a8374
--- /dev/null
+++ b/drivers/tty/serial/mux.c
@@ -0,0 +1,633 @@
+/*
+** mux.c:
+**      serial driver for the Mux console found in some PA-RISC servers.
+**
+**      (c) Copyright 2002 Ryan Bradetich
+**      (c) Copyright 2002 Hewlett-Packard Company
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+** This Driver currently only supports the console (port 0) on the MUX.
+** Additional work will be needed on this driver to enable the full
+** functionality of the MUX.
+**
+*/
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/delay.h> /* for udelay */
+#include <linux/device.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/parisc-device.h>
+
+#ifdef CONFIG_MAGIC_SYSRQ
+#include <linux/sysrq.h>
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#define MUX_OFFSET 0x800
+#define MUX_LINE_OFFSET 0x80
+
+#define MUX_FIFO_SIZE 255
+#define MUX_POLL_DELAY (30 * HZ / 1000)
+
+#define IO_DATA_REG_OFFSET 0x3c
+#define IO_DCOUNT_REG_OFFSET 0x40
+
+#define MUX_EOFIFO(status) ((status & 0xF000) == 0xF000)
+#define MUX_STATUS(status) ((status & 0xF000) == 0x8000)
+#define MUX_BREAK(status) ((status & 0xF000) == 0x2000)
+
+#define MUX_NR 256
+static unsigned int port_cnt __read_mostly;
+struct mux_port {
+        struct uart_port port;
+        int enabled;
+};
+static struct mux_port mux_ports[MUX_NR];
+
+static struct uart_driver mux_driver = {
+        .owner = THIS_MODULE,
+        .driver_name = "ttyB",
+        .dev_name = "ttyB",
+        .major = MUX_MAJOR,
+        .minor = 0,
+        .nr = MUX_NR,
+};
+
+static struct timer_list mux_timer;
+
+#define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + IO_DATA_REG_OFFSET)
+#define UART_GET_FIFO_CNT(p) __raw_readl((p)->membase + IO_DCOUNT_REG_OFFSET)
+
+/**
+ * get_mux_port_count - Get the number of available ports on the Mux.
+ * @dev: The parisc device.
+ *
+ * This function is used to determine the number of ports the Mux
+ * supports.  The IODC data reports the number of ports the Mux
+ * can support, but there are cases where not all the Mux ports
+ * are connected.  This function can override the IODC and
+ * return the true port count.
+ */
+static int __init get_mux_port_count(struct parisc_device *dev)
+{
+        int status;
+        u8 iodc_data[32];
+        unsigned long bytecnt;
+
+        /* If this is the built-in Mux for the K-Class (Eole CAP/MUX),
+         * we only need to allocate resources for 1 port since the
+         * other 7 ports are not connected.
+         */
+        if(dev->id.hversion == 0x15)
+                return 1;
+
+        status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32);
+        BUG_ON(status != PDC_OK);
+
+        /* Return the number of ports specified in the iodc data. */
+        return ((((iodc_data)[4] & 0xf0) >> 4) * 8) + 8;
+}
+
+/**
+ * mux_tx_empty - Check if the transmitter fifo is empty.
+ * @port: Ptr to the uart_port.
+ *
+ * This function test if the transmitter fifo for the port
+ * described by 'port' is empty.  If it is empty, this function
+ * should return TIOCSER_TEMT, otherwise return 0.
+ */
+static unsigned int mux_tx_empty(struct uart_port *port)
+{
+        return UART_GET_FIFO_CNT(port) ? 0 : TIOCSER_TEMT;
+} 
+
+/**
+ * mux_set_mctrl - Set the current state of the modem control inputs.
+ * @ports: Ptr to the uart_port.
+ * @mctrl: Modem control bits.
+ *
+ * The Serial MUX does not support CTS, DCD or DSR so this function
+ * is ignored.
+ */
+static void mux_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+/**
+ * mux_get_mctrl - Returns the current state of modem control inputs.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial MUX does not support CTS, DCD or DSR so these lines are
+ * treated as permanently active.
+ */
+static unsigned int mux_get_mctrl(struct uart_port *port)
+{ 
+        return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+/**
+ * mux_stop_tx - Stop transmitting characters.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial MUX does not support this function.
+ */
+static void mux_stop_tx(struct uart_port *port)
+{
+}
+
+/**
+ * mux_start_tx - Start transmitting characters.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void mux_start_tx(struct uart_port *port)
+{
+}
+
+/**
+ * mux_stop_rx - Stop receiving characters.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void mux_stop_rx(struct uart_port *port)
+{
+}
+
+/**
+ * mux_enable_ms - Enable modum status interrupts.
+ * @port: Ptr to the uart_port.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void mux_enable_ms(struct uart_port *port)
+{
+}
+
+/**
+ * mux_break_ctl - Control the transmitssion of a break signal.
+ * @port: Ptr to the uart_port.
+ * @break_state: Raise/Lower the break signal.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void mux_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+/**
+ * mux_write - Write chars to the mux fifo.
+ * @port: Ptr to the uart_port.
+ *
+ * This function writes all the data from the uart buffer to
+ * the mux fifo.
+ */
+static void mux_write(struct uart_port *port)
+{
+        int count;
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if(port->x_char) {
+                UART_PUT_CHAR(port, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+                return;
+        }
+
+        if(uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                mux_stop_tx(port);
+                return;
+        }
+
+        count = (port->fifosize) - UART_GET_FIFO_CNT(port);
+        do {
+                UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if(uart_circ_empty(xmit))
+                        break;
+
+        } while(--count > 0);
+
+        while(UART_GET_FIFO_CNT(port)) 
+                udelay(1);
+
+        if(uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                mux_stop_tx(port);
+}
+
+/**
+ * mux_read - Read chars from the mux fifo.
+ * @port: Ptr to the uart_port.
+ *
+ * This reads all available data from the mux's fifo and pushes
+ * the data to the tty layer.
+ */
+static void mux_read(struct uart_port *port)
+{
+        int data;
+        struct tty_struct *tty = port->state->port.tty;
+        __u32 start_count = port->icount.rx;
+
+        while(1) {
+                data = __raw_readl(port->membase + IO_DATA_REG_OFFSET);
+
+                if (MUX_STATUS(data))
+                        continue;
+
+                if (MUX_EOFIFO(data))
+                        break;
+
+                port->icount.rx++;
+
+                if (MUX_BREAK(data)) {
+                        port->icount.brk++;
+                        if(uart_handle_break(port))
+                                continue;
+                }
+
+                if (uart_handle_sysrq_char(port, data & 0xffu))
+                        continue;
+
+                tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL);
+        }
+        
+        if (start_count != port->icount.rx) {
+                tty_flip_buffer_push(tty);
+        }
+}
+
+/**
+ * mux_startup - Initialize the port.
+ * @port: Ptr to the uart_port.
+ *
+ * Grab any resources needed for this port and start the
+ * mux timer.
+ */
+static int mux_startup(struct uart_port *port)
+{
+        mux_ports[port->line].enabled = 1;
+        return 0;
+}
+
+/**
+ * mux_shutdown - Disable the port.
+ * @port: Ptr to the uart_port.
+ *
+ * Release any resources needed for the port.
+ */
+static void mux_shutdown(struct uart_port *port)
+{
+        mux_ports[port->line].enabled = 0;
+}
+
+/**
+ * mux_set_termios - Chane port parameters.
+ * @port: Ptr to the uart_port.
+ * @termios: new termios settings.
+ * @old: old termios settings.
+ *
+ * The Serial Mux does not support this function.
+ */
+static void
+mux_set_termios(struct uart_port *port, struct ktermios *termios,
+                struct ktermios *old)
+{
+}
+
+/**
+ * mux_type - Describe the port.
+ * @port: Ptr to the uart_port.
+ *
+ * Return a pointer to a string constant describing the
+ * specified port.
+ */
+static const char *mux_type(struct uart_port *port)
+{
+        return "Mux";
+}
+
+/**
+ * mux_release_port - Release memory and IO regions.
+ * @port: Ptr to the uart_port.
+ * 
+ * Release any memory and IO region resources currently in use by
+ * the port.
+ */
+static void mux_release_port(struct uart_port *port)
+{
+}
+
+/**
+ * mux_request_port - Request memory and IO regions.
+ * @port: Ptr to the uart_port.
+ *
+ * Request any memory and IO region resources required by the port.
+ * If any fail, no resources should be registered when this function
+ * returns, and it should return -EBUSY on failure.
+ */
+static int mux_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/**
+ * mux_config_port - Perform port autoconfiguration.
+ * @port: Ptr to the uart_port.
+ * @type: Bitmask of required configurations.
+ *
+ * Perform any autoconfiguration steps for the port.  This function is
+ * called if the UPF_BOOT_AUTOCONF flag is specified for the port.
+ * [Note: This is required for now because of a bug in the Serial core.
+ *  rmk has already submitted a patch to linus, should be available for
+ *  2.5.47.]
+ */
+static void mux_config_port(struct uart_port *port, int type)
+{
+        port->type = PORT_MUX;
+}
+
+/**
+ * mux_verify_port - Verify the port information.
+ * @port: Ptr to the uart_port.
+ * @ser: Ptr to the serial information.
+ *
+ * Verify the new serial port information contained within serinfo is
+ * suitable for this port type.
+ */
+static int mux_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        if(port->membase == NULL)
+                return -EINVAL;
+
+        return 0;
+}
+
+/**
+ * mux_drv_poll - Mux poll function.
+ * @unused: Unused variable
+ *
+ * This function periodically polls the Serial MUX to check for new data.
+ */
+static void mux_poll(unsigned long unused)
+{  
+        int i;
+
+        for(i = 0; i < port_cnt; ++i) {
+                if(!mux_ports[i].enabled)
+                        continue;
+
+                mux_read(&mux_ports[i].port);
+                mux_write(&mux_ports[i].port);
+        }
+
+        mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
+}
+
+
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+static void mux_console_write(struct console *co, const char *s, unsigned count)
+{
+        /* Wait until the FIFO drains. */
+        while(UART_GET_FIFO_CNT(&mux_ports[0].port))
+                udelay(1);
+
+        while(count--) {
+                if(*s == '\n') {
+                        UART_PUT_CHAR(&mux_ports[0].port, '\r');
+                }
+                UART_PUT_CHAR(&mux_ports[0].port, *s++);
+        }
+
+}
+
+static int mux_console_setup(struct console *co, char *options)
+{
+        return 0;
+}
+
+struct tty_driver *mux_console_device(struct console *co, int *index)
+{
+        *index = co->index;
+        return mux_driver.tty_driver;
+}
+
+static struct console mux_console = {
+        .name =         "ttyB",
+        .write =        mux_console_write,
+        .device =       mux_console_device,
+        .setup =        mux_console_setup,
+        .flags =        CON_ENABLED | CON_PRINTBUFFER,
+        .index =        0,
+};
+
+#define MUX_CONSOLE     &mux_console
+#else
+#define MUX_CONSOLE     NULL
+#endif
+
+static struct uart_ops mux_pops = {
+        .tx_empty =             mux_tx_empty,
+        .set_mctrl =            mux_set_mctrl,
+        .get_mctrl =            mux_get_mctrl,
+        .stop_tx =              mux_stop_tx,
+        .start_tx =             mux_start_tx,
+        .stop_rx =              mux_stop_rx,
+        .enable_ms =            mux_enable_ms,
+        .break_ctl =            mux_break_ctl,
+        .startup =              mux_startup,
+        .shutdown =             mux_shutdown,
+        .set_termios =          mux_set_termios,
+        .type =                 mux_type,
+        .release_port =         mux_release_port,
+        .request_port =         mux_request_port,
+        .config_port =          mux_config_port,
+        .verify_port =          mux_verify_port,
+};
+
+/**
+ * mux_probe - Determine if the Serial Mux should claim this device.
+ * @dev: The parisc device.
+ *
+ * Deterimine if the Serial Mux should claim this chip (return 0)
+ * or not (return 1).
+ */
+static int __init mux_probe(struct parisc_device *dev)
+{
+        int i, status;
+
+        int port_count = get_mux_port_count(dev);
+        printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.6\n", port_count);
+
+        dev_set_drvdata(&dev->dev, (void *)(long)port_count);
+        request_mem_region(dev->hpa.start + MUX_OFFSET,
+                           port_count * MUX_LINE_OFFSET, "Mux");
+
+        if(!port_cnt) {
+                mux_driver.cons = MUX_CONSOLE;
+
+                status = uart_register_driver(&mux_driver);
+                if(status) {
+                        printk(KERN_ERR "Serial mux: Unable to register driver.\n");
+                        return 1;
+                }
+        }
+
+        for(i = 0; i < port_count; ++i, ++port_cnt) {
+                struct uart_port *port = &mux_ports[port_cnt].port;
+                port->iobase    = 0;
+                port->mapbase   = dev->hpa.start + MUX_OFFSET +
+                                                (i * MUX_LINE_OFFSET);
+                port->membase   = ioremap_nocache(port->mapbase, MUX_LINE_OFFSET);
+                port->iotype    = UPIO_MEM;
+                port->type      = PORT_MUX;
+                port->irq       = NO_IRQ;
+                port->uartclk   = 0;
+                port->fifosize  = MUX_FIFO_SIZE;
+                port->ops       = &mux_pops;
+                port->flags     = UPF_BOOT_AUTOCONF;
+                port->line      = port_cnt;
+
+                /* The port->timeout needs to match what is present in
+                 * uart_wait_until_sent in serial_core.c.  Otherwise
+                 * the time spent in msleep_interruptable will be very
+                 * long, causing the appearance of a console hang.
+                 */
+                port->timeout   = HZ / 50;
+                spin_lock_init(&port->lock);
+
+                status = uart_add_one_port(&mux_driver, port);
+                BUG_ON(status);
+        }
+
+        return 0;
+}
+
+static int __devexit mux_remove(struct parisc_device *dev)
+{
+        int i, j;
+        int port_count = (long)dev_get_drvdata(&dev->dev);
+
+        /* Find Port 0 for this card in the mux_ports list. */
+        for(i = 0; i < port_cnt; ++i) {
+                if(mux_ports[i].port.mapbase == dev->hpa.start + MUX_OFFSET)
+                        break;
+        }
+        BUG_ON(i + port_count > port_cnt);
+
+        /* Release the resources associated with each port on the device. */
+        for(j = 0; j < port_count; ++j, ++i) {
+                struct uart_port *port = &mux_ports[i].port;
+
+                uart_remove_one_port(&mux_driver, port);
+                if(port->membase)
+                        iounmap(port->membase);
+        }
+
+        release_mem_region(dev->hpa.start + MUX_OFFSET, port_count * MUX_LINE_OFFSET);
+        return 0;
+}
+
+/* Hack.  This idea was taken from the 8250_gsc.c on how to properly order
+ * the serial port detection in the proper order.   The idea is we always
+ * want the builtin mux to be detected before addin mux cards, so we
+ * specifically probe for the builtin mux cards first.
+ *
+ * This table only contains the parisc_device_id of known builtin mux
+ * devices.  All other mux cards will be detected by the generic mux_tbl.
+ */
+static struct parisc_device_id builtin_mux_tbl[] = {
+        { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x15, 0x0000D }, /* All K-class */
+        { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x44, 0x0000D }, /* E35, E45, and E55 */
+        { 0, }
+};
+
+static struct parisc_device_id mux_tbl[] = {
+        { HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D },
+        { 0, }
+};
+
+MODULE_DEVICE_TABLE(parisc, builtin_mux_tbl);
+MODULE_DEVICE_TABLE(parisc, mux_tbl);
+
+static struct parisc_driver builtin_serial_mux_driver = {
+        .name =         "builtin_serial_mux",
+        .id_table =     builtin_mux_tbl,
+        .probe =        mux_probe,
+        .remove =       __devexit_p(mux_remove),
+};
+
+static struct parisc_driver serial_mux_driver = {
+        .name =         "serial_mux",
+        .id_table =     mux_tbl,
+        .probe =        mux_probe,
+        .remove =       __devexit_p(mux_remove),
+};
+
+/**
+ * mux_init - Serial MUX initialization procedure.
+ *
+ * Register the Serial MUX driver.
+ */
+static int __init mux_init(void)
+{
+        register_parisc_driver(&builtin_serial_mux_driver);
+        register_parisc_driver(&serial_mux_driver);
+
+        if(port_cnt > 0) {
+                /* Start the Mux timer */
+                init_timer(&mux_timer);
+                mux_timer.function = mux_poll;
+                mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
+
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+                register_console(&mux_console);
+#endif
+        }
+
+        return 0;
+}
+
+/**
+ * mux_exit - Serial MUX cleanup procedure.
+ *
+ * Unregister the Serial MUX driver from the tty layer.
+ */
+static void __exit mux_exit(void)
+{
+        /* Delete the Mux timer. */
+        if(port_cnt > 0) {
+                del_timer(&mux_timer);
+#ifdef CONFIG_SERIAL_MUX_CONSOLE
+                unregister_console(&mux_console);
+#endif
+        }
+
+        unregister_parisc_driver(&builtin_serial_mux_driver);
+        unregister_parisc_driver(&serial_mux_driver);
+        uart_unregister_driver(&mux_driver);
+}
+
+module_init(mux_init);
+module_exit(mux_exit);
+
+MODULE_AUTHOR("Ryan Bradetich");
+MODULE_DESCRIPTION("Serial MUX driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(MUX_MAJOR);
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
new file mode 100644
index 000000000000..7e02c9c344fe
--- /dev/null
+++ b/drivers/tty/serial/mxs-auart.c
@@ -0,0 +1,798 @@
+/*
+ * Freescale STMP37XX/STMP378X Application UART driver
+ *
+ * Author: dmitry pervushin <dimka@embeddedalley.com>
+ *
+ * Copyright 2008-2010 Freescale Semiconductor, Inc.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <asm/cacheflush.h>
+
+#define MXS_AUART_PORTS 5
+
+#define AUART_CTRL0                     0x00000000
+#define AUART_CTRL0_SET                 0x00000004
+#define AUART_CTRL0_CLR                 0x00000008
+#define AUART_CTRL0_TOG                 0x0000000c
+#define AUART_CTRL1                     0x00000010
+#define AUART_CTRL1_SET                 0x00000014
+#define AUART_CTRL1_CLR                 0x00000018
+#define AUART_CTRL1_TOG                 0x0000001c
+#define AUART_CTRL2                     0x00000020
+#define AUART_CTRL2_SET                 0x00000024
+#define AUART_CTRL2_CLR                 0x00000028
+#define AUART_CTRL2_TOG                 0x0000002c
+#define AUART_LINECTRL                  0x00000030
+#define AUART_LINECTRL_SET              0x00000034
+#define AUART_LINECTRL_CLR              0x00000038
+#define AUART_LINECTRL_TOG              0x0000003c
+#define AUART_LINECTRL2                 0x00000040
+#define AUART_LINECTRL2_SET             0x00000044
+#define AUART_LINECTRL2_CLR             0x00000048
+#define AUART_LINECTRL2_TOG             0x0000004c
+#define AUART_INTR                      0x00000050
+#define AUART_INTR_SET                  0x00000054
+#define AUART_INTR_CLR                  0x00000058
+#define AUART_INTR_TOG                  0x0000005c
+#define AUART_DATA                      0x00000060
+#define AUART_STAT                      0x00000070
+#define AUART_DEBUG                     0x00000080
+#define AUART_VERSION                   0x00000090
+#define AUART_AUTOBAUD                  0x000000a0
+
+#define AUART_CTRL0_SFTRST                      (1 << 31)
+#define AUART_CTRL0_CLKGATE                     (1 << 30)
+
+#define AUART_CTRL2_CTSEN                       (1 << 15)
+#define AUART_CTRL2_RTS                         (1 << 11)
+#define AUART_CTRL2_RXE                         (1 << 9)
+#define AUART_CTRL2_TXE                         (1 << 8)
+#define AUART_CTRL2_UARTEN                      (1 << 0)
+
+#define AUART_LINECTRL_BAUD_DIVINT_SHIFT        16
+#define AUART_LINECTRL_BAUD_DIVINT_MASK         0xffff0000
+#define AUART_LINECTRL_BAUD_DIVINT(v)           (((v) & 0xffff) << 16)
+#define AUART_LINECTRL_BAUD_DIVFRAC_SHIFT       8
+#define AUART_LINECTRL_BAUD_DIVFRAC_MASK        0x00003f00
+#define AUART_LINECTRL_BAUD_DIVFRAC(v)          (((v) & 0x3f) << 8)
+#define AUART_LINECTRL_WLEN_MASK                0x00000060
+#define AUART_LINECTRL_WLEN(v)                  (((v) & 0x3) << 5)
+#define AUART_LINECTRL_FEN                      (1 << 4)
+#define AUART_LINECTRL_STP2                     (1 << 3)
+#define AUART_LINECTRL_EPS                      (1 << 2)
+#define AUART_LINECTRL_PEN                      (1 << 1)
+#define AUART_LINECTRL_BRK                      (1 << 0)
+
+#define AUART_INTR_RTIEN                        (1 << 22)
+#define AUART_INTR_TXIEN                        (1 << 21)
+#define AUART_INTR_RXIEN                        (1 << 20)
+#define AUART_INTR_CTSMIEN                      (1 << 17)
+#define AUART_INTR_RTIS                         (1 << 6)
+#define AUART_INTR_TXIS                         (1 << 5)
+#define AUART_INTR_RXIS                         (1 << 4)
+#define AUART_INTR_CTSMIS                       (1 << 1)
+
+#define AUART_STAT_BUSY                         (1 << 29)
+#define AUART_STAT_CTS                          (1 << 28)
+#define AUART_STAT_TXFE                         (1 << 27)
+#define AUART_STAT_TXFF                         (1 << 25)
+#define AUART_STAT_RXFE                         (1 << 24)
+#define AUART_STAT_OERR                         (1 << 19)
+#define AUART_STAT_BERR                         (1 << 18)
+#define AUART_STAT_PERR                         (1 << 17)
+#define AUART_STAT_FERR                         (1 << 16)
+
+static struct uart_driver auart_driver;
+
+struct mxs_auart_port {
+        struct uart_port port;
+
+        unsigned int flags;
+        unsigned int ctrl;
+
+        unsigned int irq;
+
+        struct clk *clk;
+        struct device *dev;
+};
+
+static void mxs_auart_stop_tx(struct uart_port *u);
+
+#define to_auart_port(u) container_of(u, struct mxs_auart_port, port)
+
+static inline void mxs_auart_tx_chars(struct mxs_auart_port *s)
+{
+        struct circ_buf *xmit = &s->port.state->xmit;
+
+        while (!(readl(s->port.membase + AUART_STAT) &
+                 AUART_STAT_TXFF)) {
+                if (s->port.x_char) {
+                        s->port.icount.tx++;
+                        writel(s->port.x_char,
+                                     s->port.membase + AUART_DATA);
+                        s->port.x_char = 0;
+                        continue;
+                }
+                if (!uart_circ_empty(xmit) && !uart_tx_stopped(&s->port)) {
+                        s->port.icount.tx++;
+                        writel(xmit->buf[xmit->tail],
+                                     s->port.membase + AUART_DATA);
+                        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                                uart_write_wakeup(&s->port);
+                } else
+                        break;
+        }
+        if (uart_circ_empty(&(s->port.state->xmit)))
+                writel(AUART_INTR_TXIEN,
+                             s->port.membase + AUART_INTR_CLR);
+        else
+                writel(AUART_INTR_TXIEN,
+                             s->port.membase + AUART_INTR_SET);
+
+        if (uart_tx_stopped(&s->port))
+                mxs_auart_stop_tx(&s->port);
+}
+
+static void mxs_auart_rx_char(struct mxs_auart_port *s)
+{
+        int flag;
+        u32 stat;
+        u8 c;
+
+        c = readl(s->port.membase + AUART_DATA);
+        stat = readl(s->port.membase + AUART_STAT);
+
+        flag = TTY_NORMAL;
+        s->port.icount.rx++;
+
+        if (stat & AUART_STAT_BERR) {
+                s->port.icount.brk++;
+                if (uart_handle_break(&s->port))
+                        goto out;
+        } else if (stat & AUART_STAT_PERR) {
+                s->port.icount.parity++;
+        } else if (stat & AUART_STAT_FERR) {
+                s->port.icount.frame++;
+        }
+
+        /*
+         * Mask off conditions which should be ingored.
+         */
+        stat &= s->port.read_status_mask;
+
+        if (stat & AUART_STAT_BERR) {
+                flag = TTY_BREAK;
+        } else if (stat & AUART_STAT_PERR)
+                flag = TTY_PARITY;
+        else if (stat & AUART_STAT_FERR)
+                flag = TTY_FRAME;
+
+        if (stat & AUART_STAT_OERR)
+                s->port.icount.overrun++;
+
+        if (uart_handle_sysrq_char(&s->port, c))
+                goto out;
+
+        uart_insert_char(&s->port, stat, AUART_STAT_OERR, c, flag);
+out:
+        writel(stat, s->port.membase + AUART_STAT);
+}
+
+static void mxs_auart_rx_chars(struct mxs_auart_port *s)
+{
+        struct tty_struct *tty = s->port.state->port.tty;
+        u32 stat = 0;
+
+        for (;;) {
+                stat = readl(s->port.membase + AUART_STAT);
+                if (stat & AUART_STAT_RXFE)
+                        break;
+                mxs_auart_rx_char(s);
+        }
+
+        writel(stat, s->port.membase + AUART_STAT);
+        tty_flip_buffer_push(tty);
+}
+
+static int mxs_auart_request_port(struct uart_port *u)
+{
+        return 0;
+}
+
+static int mxs_auart_verify_port(struct uart_port *u,
+                                    struct serial_struct *ser)
+{
+        if (u->type != PORT_UNKNOWN && u->type != PORT_IMX)
+                return -EINVAL;
+        return 0;
+}
+
+static void mxs_auart_config_port(struct uart_port *u, int flags)
+{
+}
+
+static const char *mxs_auart_type(struct uart_port *u)
+{
+        struct mxs_auart_port *s = to_auart_port(u);
+
+        return dev_name(s->dev);
+}
+
+static void mxs_auart_release_port(struct uart_port *u)
+{
+}
+
+static void mxs_auart_set_mctrl(struct uart_port *u, unsigned mctrl)
+{
+        struct mxs_auart_port *s = to_auart_port(u);
+
+        u32 ctrl = readl(u->membase + AUART_CTRL2);
+
+        ctrl &= ~AUART_CTRL2_RTS;
+        if (mctrl & TIOCM_RTS)
+                ctrl |= AUART_CTRL2_RTS;
+        s->ctrl = mctrl;
+        writel(ctrl, u->membase + AUART_CTRL2);
+}
+
+static u32 mxs_auart_get_mctrl(struct uart_port *u)
+{
+        struct mxs_auart_port *s = to_auart_port(u);
+        u32 stat = readl(u->membase + AUART_STAT);
+        int ctrl2 = readl(u->membase + AUART_CTRL2);
+        u32 mctrl = s->ctrl;
+
+        mctrl &= ~TIOCM_CTS;
+        if (stat & AUART_STAT_CTS)
+                mctrl |= TIOCM_CTS;
+
+        if (ctrl2 & AUART_CTRL2_RTS)
+                mctrl |= TIOCM_RTS;
+
+        return mctrl;
+}
+
+static void mxs_auart_settermios(struct uart_port *u,
+                                 struct ktermios *termios,
+                                 struct ktermios *old)
+{
+        u32 bm, ctrl, ctrl2, div;
+        unsigned int cflag, baud;
+
+        cflag = termios->c_cflag;
+
+        ctrl = AUART_LINECTRL_FEN;
+        ctrl2 = readl(u->membase + AUART_CTRL2);
+
+        /* byte size */
+        switch (cflag & CSIZE) {
+        case CS5:
+                bm = 0;
+                break;
+        case CS6:
+                bm = 1;
+                break;
+        case CS7:
+                bm = 2;
+                break;
+        case CS8:
+                bm = 3;
+                break;
+        default:
+                return;
+        }
+
+        ctrl |= AUART_LINECTRL_WLEN(bm);
+
+        /* parity */
+        if (cflag & PARENB) {
+                ctrl |= AUART_LINECTRL_PEN;
+                if ((cflag & PARODD) == 0)
+                        ctrl |= AUART_LINECTRL_EPS;
+        }
+
+        u->read_status_mask = 0;
+
+        if (termios->c_iflag & INPCK)
+                u->read_status_mask |= AUART_STAT_PERR;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                u->read_status_mask |= AUART_STAT_BERR;
+
+        /*
+         * Characters to ignore
+         */
+        u->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                u->ignore_status_mask |= AUART_STAT_PERR;
+        if (termios->c_iflag & IGNBRK) {
+                u->ignore_status_mask |= AUART_STAT_BERR;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        u->ignore_status_mask |= AUART_STAT_OERR;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if (cflag & CREAD)
+                ctrl2 |= AUART_CTRL2_RXE;
+        else
+                ctrl2 &= ~AUART_CTRL2_RXE;
+
+        /* figure out the stop bits requested */
+        if (cflag & CSTOPB)
+                ctrl |= AUART_LINECTRL_STP2;
+
+        /* figure out the hardware flow control settings */
+        if (cflag & CRTSCTS)
+                ctrl2 |= AUART_CTRL2_CTSEN;
+        else
+                ctrl2 &= ~AUART_CTRL2_CTSEN;
+
+        /* set baud rate */
+        baud = uart_get_baud_rate(u, termios, old, 0, u->uartclk);
+        div = u->uartclk * 32 / baud;
+        ctrl |= AUART_LINECTRL_BAUD_DIVFRAC(div & 0x3F);
+        ctrl |= AUART_LINECTRL_BAUD_DIVINT(div >> 6);
+
+        writel(ctrl, u->membase + AUART_LINECTRL);
+        writel(ctrl2, u->membase + AUART_CTRL2);
+}
+
+static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
+{
+        u32 istatus, istat;
+        struct mxs_auart_port *s = context;
+        u32 stat = readl(s->port.membase + AUART_STAT);
+
+        istatus = istat = readl(s->port.membase + AUART_INTR);
+
+        if (istat & AUART_INTR_CTSMIS) {
+                uart_handle_cts_change(&s->port, stat & AUART_STAT_CTS);
+                writel(AUART_INTR_CTSMIS,
+                                s->port.membase + AUART_INTR_CLR);
+                istat &= ~AUART_INTR_CTSMIS;
+        }
+
+        if (istat & (AUART_INTR_RTIS | AUART_INTR_RXIS)) {
+                mxs_auart_rx_chars(s);
+                istat &= ~(AUART_INTR_RTIS | AUART_INTR_RXIS);
+        }
+
+        if (istat & AUART_INTR_TXIS) {
+                mxs_auart_tx_chars(s);
+                istat &= ~AUART_INTR_TXIS;
+        }
+
+        writel(istatus & (AUART_INTR_RTIS
+                | AUART_INTR_TXIS
+                | AUART_INTR_RXIS
+                | AUART_INTR_CTSMIS),
+                        s->port.membase + AUART_INTR_CLR);
+
+        return IRQ_HANDLED;
+}
+
+static void mxs_auart_reset(struct uart_port *u)
+{
+        int i;
+        unsigned int reg;
+
+        writel(AUART_CTRL0_SFTRST, u->membase + AUART_CTRL0_CLR);
+
+        for (i = 0; i < 10000; i++) {
+                reg = readl(u->membase + AUART_CTRL0);
+                if (!(reg & AUART_CTRL0_SFTRST))
+                        break;
+                udelay(3);
+        }
+        writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR);
+}
+
+static int mxs_auart_startup(struct uart_port *u)
+{
+        struct mxs_auart_port *s = to_auart_port(u);
+
+        clk_enable(s->clk);
+
+        writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_CLR);
+
+        writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_SET);
+
+        writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN,
+                        u->membase + AUART_INTR);
+
+        /*
+         * Enable fifo so all four bytes of a DMA word are written to
+         * output (otherwise, only the LSB is written, ie. 1 in 4 bytes)
+         */
+        writel(AUART_LINECTRL_FEN, u->membase + AUART_LINECTRL_SET);
+
+        return 0;
+}
+
+static void mxs_auart_shutdown(struct uart_port *u)
+{
+        struct mxs_auart_port *s = to_auart_port(u);
+
+        writel(AUART_CTRL2_UARTEN, u->membase + AUART_CTRL2_CLR);
+
+        writel(AUART_CTRL0_CLKGATE, u->membase + AUART_CTRL0_SET);
+
+        writel(AUART_INTR_RXIEN | AUART_INTR_RTIEN | AUART_INTR_CTSMIEN,
+                        u->membase + AUART_INTR_CLR);
+
+        clk_disable(s->clk);
+}
+
+static unsigned int mxs_auart_tx_empty(struct uart_port *u)
+{
+        if (readl(u->membase + AUART_STAT) & AUART_STAT_TXFE)
+                return TIOCSER_TEMT;
+        else
+                return 0;
+}
+
+static void mxs_auart_start_tx(struct uart_port *u)
+{
+        struct mxs_auart_port *s = to_auart_port(u);
+
+        /* enable transmitter */
+        writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_SET);
+
+        mxs_auart_tx_chars(s);
+}
+
+static void mxs_auart_stop_tx(struct uart_port *u)
+{
+        writel(AUART_CTRL2_TXE, u->membase + AUART_CTRL2_CLR);
+}
+
+static void mxs_auart_stop_rx(struct uart_port *u)
+{
+        writel(AUART_CTRL2_RXE, u->membase + AUART_CTRL2_CLR);
+}
+
+static void mxs_auart_break_ctl(struct uart_port *u, int ctl)
+{
+        if (ctl)
+                writel(AUART_LINECTRL_BRK,
+                             u->membase + AUART_LINECTRL_SET);
+        else
+                writel(AUART_LINECTRL_BRK,
+                             u->membase + AUART_LINECTRL_CLR);
+}
+
+static void mxs_auart_enable_ms(struct uart_port *port)
+{
+        /* just empty */
+}
+
+static struct uart_ops mxs_auart_ops = {
+        .tx_empty       = mxs_auart_tx_empty,
+        .start_tx       = mxs_auart_start_tx,
+        .stop_tx        = mxs_auart_stop_tx,
+        .stop_rx        = mxs_auart_stop_rx,
+        .enable_ms      = mxs_auart_enable_ms,
+        .break_ctl      = mxs_auart_break_ctl,
+        .set_mctrl      = mxs_auart_set_mctrl,
+        .get_mctrl      = mxs_auart_get_mctrl,
+        .startup        = mxs_auart_startup,
+        .shutdown       = mxs_auart_shutdown,
+        .set_termios    = mxs_auart_settermios,
+        .type           = mxs_auart_type,
+        .release_port   = mxs_auart_release_port,
+        .request_port   = mxs_auart_request_port,
+        .config_port    = mxs_auart_config_port,
+        .verify_port    = mxs_auart_verify_port,
+};
+
+static struct mxs_auart_port *auart_port[MXS_AUART_PORTS];
+
+#ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE
+static void mxs_auart_console_putchar(struct uart_port *port, int ch)
+{
+        unsigned int to = 1000;
+
+        while (readl(port->membase + AUART_STAT) & AUART_STAT_TXFF) {
+                if (!to--)
+                        break;
+                udelay(1);
+        }
+
+        writel(ch, port->membase + AUART_DATA);
+}
+
+static void
+auart_console_write(struct console *co, const char *str, unsigned int count)
+{
+        struct mxs_auart_port *s;
+        struct uart_port *port;
+        unsigned int old_ctrl0, old_ctrl2;
+        unsigned int to = 1000;
+
+        if (co->index > MXS_AUART_PORTS || co->index < 0)
+                return;
+
+        s = auart_port[co->index];
+        port = &s->port;
+
+        clk_enable(s->clk);
+
+        /* First save the CR then disable the interrupts */
+        old_ctrl2 = readl(port->membase + AUART_CTRL2);
+        old_ctrl0 = readl(port->membase + AUART_CTRL0);
+
+        writel(AUART_CTRL0_CLKGATE,
+                     port->membase + AUART_CTRL0_CLR);
+        writel(AUART_CTRL2_UARTEN | AUART_CTRL2_TXE,
+                     port->membase + AUART_CTRL2_SET);
+
+        uart_console_write(port, str, count, mxs_auart_console_putchar);
+
+        /*
+         * Finally, wait for transmitter to become empty
+         * and restore the TCR
+         */
+        while (readl(port->membase + AUART_STAT) & AUART_STAT_BUSY) {
+                if (!to--)
+                        break;
+                udelay(1);
+        }
+
+        writel(old_ctrl0, port->membase + AUART_CTRL0);
+        writel(old_ctrl2, port->membase + AUART_CTRL2);
+
+        clk_disable(s->clk);
+}
+
+static void __init
+auart_console_get_options(struct uart_port *port, int *baud,
+                          int *parity, int *bits)
+{
+        unsigned int lcr_h, quot;
+
+        if (!(readl(port->membase + AUART_CTRL2) & AUART_CTRL2_UARTEN))
+                return;
+
+        lcr_h = readl(port->membase + AUART_LINECTRL);
+
+        *parity = 'n';
+        if (lcr_h & AUART_LINECTRL_PEN) {
+                if (lcr_h & AUART_LINECTRL_EPS)
+                        *parity = 'e';
+                else
+                        *parity = 'o';
+        }
+
+        if ((lcr_h & AUART_LINECTRL_WLEN_MASK) == AUART_LINECTRL_WLEN(2))
+                *bits = 7;
+        else
+                *bits = 8;
+
+        quot = ((readl(port->membase + AUART_LINECTRL)
+                        & AUART_LINECTRL_BAUD_DIVINT_MASK))
+                            >> (AUART_LINECTRL_BAUD_DIVINT_SHIFT - 6);
+        quot |= ((readl(port->membase + AUART_LINECTRL)
+                        & AUART_LINECTRL_BAUD_DIVFRAC_MASK))
+                                >> AUART_LINECTRL_BAUD_DIVFRAC_SHIFT;
+        if (quot == 0)
+                quot = 1;
+
+        *baud = (port->uartclk << 2) / quot;
+}
+
+static int __init
+auart_console_setup(struct console *co, char *options)
+{
+        struct mxs_auart_port *s;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index == -1 || co->index >= ARRAY_SIZE(auart_port))
+                co->index = 0;
+        s = auart_port[co->index];
+        if (!s)
+                return -ENODEV;
+
+        clk_enable(s->clk);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                auart_console_get_options(&s->port, &baud, &parity, &bits);
+
+        ret = uart_set_options(&s->port, co, baud, parity, bits, flow);
+
+        clk_disable(s->clk);
+
+        return ret;
+}
+
+static struct console auart_console = {
+        .name           = "ttyAPP",
+        .write          = auart_console_write,
+        .device         = uart_console_device,
+        .setup          = auart_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &auart_driver,
+};
+#endif
+
+static struct uart_driver auart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "ttyAPP",
+        .dev_name       = "ttyAPP",
+        .major          = 0,
+        .minor          = 0,
+        .nr             = MXS_AUART_PORTS,
+#ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE
+        .cons =         &auart_console,
+#endif
+};
+
+static int __devinit mxs_auart_probe(struct platform_device *pdev)
+{
+        struct mxs_auart_port *s;
+        u32 version;
+        int ret = 0;
+        struct resource *r;
+
+        s = kzalloc(sizeof(struct mxs_auart_port), GFP_KERNEL);
+        if (!s) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        s->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(s->clk)) {
+                ret = PTR_ERR(s->clk);
+                goto out_free;
+        }
+
+        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!r) {
+                ret = -ENXIO;
+                goto out_free_clk;
+        }
+
+        s->port.mapbase = r->start;
+        s->port.membase = ioremap(r->start, resource_size(r));
+        s->port.ops = &mxs_auart_ops;
+        s->port.iotype = UPIO_MEM;
+        s->port.line = pdev->id < 0 ? 0 : pdev->id;
+        s->port.fifosize = 16;
+        s->port.uartclk = clk_get_rate(s->clk);
+        s->port.type = PORT_IMX;
+        s->port.dev = s->dev = get_device(&pdev->dev);
+
+        s->flags = 0;
+        s->ctrl = 0;
+
+        s->irq = platform_get_irq(pdev, 0);
+        s->port.irq = s->irq;
+        ret = request_irq(s->irq, mxs_auart_irq_handle, 0, dev_name(&pdev->dev), s);
+        if (ret)
+                goto out_free_clk;
+
+        platform_set_drvdata(pdev, s);
+
+        auart_port[pdev->id] = s;
+
+        mxs_auart_reset(&s->port);
+
+        ret = uart_add_one_port(&auart_driver, &s->port);
+        if (ret)
+                goto out_free_irq;
+
+        version = readl(s->port.membase + AUART_VERSION);
+        dev_info(&pdev->dev, "Found APPUART %d.%d.%d\n",
+               (version >> 24) & 0xff,
+               (version >> 16) & 0xff, version & 0xffff);
+
+        return 0;
+
+out_free_irq:
+        auart_port[pdev->id] = NULL;
+        free_irq(s->irq, s);
+out_free_clk:
+        clk_put(s->clk);
+out_free:
+        kfree(s);
+out:
+        return ret;
+}
+
+static int __devexit mxs_auart_remove(struct platform_device *pdev)
+{
+        struct mxs_auart_port *s = platform_get_drvdata(pdev);
+
+        uart_remove_one_port(&auart_driver, &s->port);
+
+        auart_port[pdev->id] = NULL;
+
+        clk_put(s->clk);
+        free_irq(s->irq, s);
+        kfree(s);
+
+        return 0;
+}
+
+static struct platform_driver mxs_auart_driver = {
+        .probe = mxs_auart_probe,
+        .remove = __devexit_p(mxs_auart_remove),
+        .driver = {
+                .name = "mxs-auart",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init mxs_auart_init(void)
+{
+        int r;
+
+        r = uart_register_driver(&auart_driver);
+        if (r)
+                goto out;
+
+        r = platform_driver_register(&mxs_auart_driver);
+        if (r)
+                goto out_err;
+
+        return 0;
+out_err:
+        uart_unregister_driver(&auart_driver);
+out:
+        return r;
+}
+
+static void __exit mxs_auart_exit(void)
+{
+        platform_driver_unregister(&mxs_auart_driver);
+        uart_unregister_driver(&auart_driver);
+}
+
+module_init(mxs_auart_init);
+module_exit(mxs_auart_exit);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Freescale MXS application uart driver");
diff --git a/drivers/tty/serial/netx-serial.c b/drivers/tty/serial/netx-serial.c
new file mode 100644
index 000000000000..d40da78e7c85
--- /dev/null
+++ b/drivers/tty/serial/netx-serial.c
@@ -0,0 +1,748 @@
+/*
+ * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <mach/netx-regs.h>
+
+/* We've been assigned a range on the "Low-density serial ports" major */
+#define SERIAL_NX_MAJOR 204
+#define MINOR_START     170
+
+enum uart_regs {
+        UART_DR              = 0x00,
+        UART_SR              = 0x04,
+        UART_LINE_CR         = 0x08,
+        UART_BAUDDIV_MSB     = 0x0c,
+        UART_BAUDDIV_LSB     = 0x10,
+        UART_CR              = 0x14,
+        UART_FR              = 0x18,
+        UART_IIR             = 0x1c,
+        UART_ILPR            = 0x20,
+        UART_RTS_CR          = 0x24,
+        UART_RTS_LEAD        = 0x28,
+        UART_RTS_TRAIL       = 0x2c,
+        UART_DRV_ENABLE      = 0x30,
+        UART_BRM_CR          = 0x34,
+        UART_RXFIFO_IRQLEVEL = 0x38,
+        UART_TXFIFO_IRQLEVEL = 0x3c,
+};
+
+#define SR_FE (1<<0)
+#define SR_PE (1<<1)
+#define SR_BE (1<<2)
+#define SR_OE (1<<3)
+
+#define LINE_CR_BRK       (1<<0)
+#define LINE_CR_PEN       (1<<1)
+#define LINE_CR_EPS       (1<<2)
+#define LINE_CR_STP2      (1<<3)
+#define LINE_CR_FEN       (1<<4)
+#define LINE_CR_5BIT      (0<<5)
+#define LINE_CR_6BIT      (1<<5)
+#define LINE_CR_7BIT      (2<<5)
+#define LINE_CR_8BIT      (3<<5)
+#define LINE_CR_BITS_MASK (3<<5)
+
+#define CR_UART_EN (1<<0)
+#define CR_SIREN   (1<<1)
+#define CR_SIRLP   (1<<2)
+#define CR_MSIE    (1<<3)
+#define CR_RIE     (1<<4)
+#define CR_TIE     (1<<5)
+#define CR_RTIE    (1<<6)
+#define CR_LBE     (1<<7)
+
+#define FR_CTS  (1<<0)
+#define FR_DSR  (1<<1)
+#define FR_DCD  (1<<2)
+#define FR_BUSY (1<<3)
+#define FR_RXFE (1<<4)
+#define FR_TXFF (1<<5)
+#define FR_RXFF (1<<6)
+#define FR_TXFE (1<<7)
+
+#define IIR_MIS (1<<0)
+#define IIR_RIS (1<<1)
+#define IIR_TIS (1<<2)
+#define IIR_RTIS (1<<3)
+#define IIR_MASK 0xf
+
+#define RTS_CR_AUTO (1<<0)
+#define RTS_CR_RTS  (1<<1)
+#define RTS_CR_COUNT (1<<2)
+#define RTS_CR_MOD2  (1<<3)
+#define RTS_CR_RTS_POL (1<<4)
+#define RTS_CR_CTS_CTR (1<<5)
+#define RTS_CR_CTS_POL (1<<6)
+#define RTS_CR_STICK   (1<<7)
+
+#define UART_PORT_SIZE 0x40
+#define DRIVER_NAME "netx-uart"
+
+struct netx_port {
+        struct uart_port        port;
+};
+
+static void netx_stop_tx(struct uart_port *port)
+{
+        unsigned int val;
+        val = readl(port->membase + UART_CR);
+        writel(val & ~CR_TIE,  port->membase + UART_CR);
+}
+
+static void netx_stop_rx(struct uart_port *port)
+{
+        unsigned int val;
+        val = readl(port->membase + UART_CR);
+        writel(val & ~CR_RIE,  port->membase + UART_CR);
+}
+
+static void netx_enable_ms(struct uart_port *port)
+{
+        unsigned int val;
+        val = readl(port->membase + UART_CR);
+        writel(val | CR_MSIE, port->membase + UART_CR);
+}
+
+static inline void netx_transmit_buffer(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (port->x_char) {
+                writel(port->x_char, port->membase + UART_DR);
+                port->icount.tx++;
+                port->x_char = 0;
+                return;
+        }
+
+        if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
+                netx_stop_tx(port);
+                return;
+        }
+
+        do {
+                /* send xmit->buf[xmit->tail]
+                 * out the port here */
+                writel(xmit->buf[xmit->tail], port->membase + UART_DR);
+                xmit->tail = (xmit->tail + 1) &
+                         (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (!(readl(port->membase + UART_FR) & FR_TXFF));
+
+        if (uart_circ_empty(xmit))
+                netx_stop_tx(port);
+}
+
+static void netx_start_tx(struct uart_port *port)
+{
+        writel(
+            readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);
+
+        if (!(readl(port->membase + UART_FR) & FR_TXFF))
+                netx_transmit_buffer(port);
+}
+
+static unsigned int netx_tx_empty(struct uart_port *port)
+{
+        return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
+}
+
+static void netx_txint(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                netx_stop_tx(port);
+                return;
+        }
+
+        netx_transmit_buffer(port);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+}
+
+static void netx_rxint(struct uart_port *port)
+{
+        unsigned char rx, flg, status;
+        struct tty_struct *tty = port->state->port.tty;
+
+        while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
+                rx = readl(port->membase + UART_DR);
+                flg = TTY_NORMAL;
+                port->icount.rx++;
+                status = readl(port->membase + UART_SR);
+                if (status & SR_BE) {
+                        writel(0, port->membase + UART_SR);
+                        if (uart_handle_break(port))
+                                continue;
+                }
+
+                if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {
+
+                        if (status & SR_PE)
+                                port->icount.parity++;
+                        else if (status & SR_FE)
+                                port->icount.frame++;
+                        if (status & SR_OE)
+                                port->icount.overrun++;
+
+                        status &= port->read_status_mask;
+
+                        if (status & SR_BE)
+                                flg = TTY_BREAK;
+                        else if (status & SR_PE)
+                                flg = TTY_PARITY;
+                        else if (status & SR_FE)
+                                flg = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, rx))
+                        continue;
+
+                uart_insert_char(port, status, SR_OE, rx, flg);
+        }
+
+        tty_flip_buffer_push(tty);
+        return;
+}
+
+static irqreturn_t netx_int(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        unsigned long flags;
+        unsigned char status;
+
+        spin_lock_irqsave(&port->lock,flags);
+
+        status = readl(port->membase + UART_IIR) & IIR_MASK;
+        while (status) {
+                if (status & IIR_RIS)
+                        netx_rxint(port);
+                if (status & IIR_TIS)
+                        netx_txint(port);
+                if (status & IIR_MIS) {
+                        if (readl(port->membase + UART_FR) & FR_CTS)
+                                uart_handle_cts_change(port, 1);
+                        else
+                                uart_handle_cts_change(port, 0);
+                }
+                writel(0, port->membase + UART_IIR);
+                status = readl(port->membase + UART_IIR) & IIR_MASK;
+        }
+
+        spin_unlock_irqrestore(&port->lock,flags);
+        return IRQ_HANDLED;
+}
+
+static unsigned int netx_get_mctrl(struct uart_port *port)
+{
+        unsigned int ret = TIOCM_DSR | TIOCM_CAR;
+
+        if (readl(port->membase + UART_FR) & FR_CTS)
+                ret |= TIOCM_CTS;
+
+        return ret;
+}
+
+static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        unsigned int val;
+
+        /* FIXME: Locking needed ? */
+        if (mctrl & TIOCM_RTS) {
+                val = readl(port->membase + UART_RTS_CR);
+                writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
+        }
+}
+
+static void netx_break_ctl(struct uart_port *port, int break_state)
+{
+        unsigned int line_cr;
+        spin_lock_irq(&port->lock);
+
+        line_cr = readl(port->membase + UART_LINE_CR);
+        if (break_state != 0)
+                line_cr |= LINE_CR_BRK;
+        else
+                line_cr &= ~LINE_CR_BRK;
+        writel(line_cr, port->membase + UART_LINE_CR);
+
+        spin_unlock_irq(&port->lock);
+}
+
+static int netx_startup(struct uart_port *port)
+{
+        int ret;
+
+        ret = request_irq(port->irq, netx_int, 0,
+                             DRIVER_NAME, port);
+        if (ret) {
+                dev_err(port->dev, "unable to grab irq%d\n",port->irq);
+                goto exit;
+        }
+
+        writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
+                port->membase + UART_LINE_CR);
+
+        writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
+                port->membase + UART_CR);
+
+exit:
+        return ret;
+}
+
+static void netx_shutdown(struct uart_port *port)
+{
+        writel(0, port->membase + UART_CR) ;
+
+        free_irq(port->irq, port);
+}
+
+static void
+netx_set_termios(struct uart_port *port, struct ktermios *termios,
+                   struct ktermios *old)
+{
+        unsigned int baud, quot;
+        unsigned char old_cr;
+        unsigned char line_cr = LINE_CR_FEN;
+        unsigned char rts_cr = 0;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                line_cr |= LINE_CR_5BIT;
+                break;
+        case CS6:
+                line_cr |= LINE_CR_6BIT;
+                break;
+        case CS7:
+                line_cr |= LINE_CR_7BIT;
+                break;
+        case CS8:
+                line_cr |= LINE_CR_8BIT;
+                break;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                line_cr |= LINE_CR_STP2;
+
+        if (termios->c_cflag & PARENB) {
+                line_cr |= LINE_CR_PEN;
+                if (!(termios->c_cflag & PARODD))
+                        line_cr |= LINE_CR_EPS;
+        }
+
+        if (termios->c_cflag & CRTSCTS)
+                rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+        quot = baud * 4096;
+        quot /= 1000;
+        quot *= 256;
+        quot /= 100000;
+
+        spin_lock_irq(&port->lock);
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        old_cr = readl(port->membase + UART_CR);
+
+        /* disable interrupts */
+        writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
+                port->membase + UART_CR);
+
+        /* drain transmitter */
+        while (readl(port->membase + UART_FR) & FR_BUSY);
+
+        /* disable UART */
+        writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
+
+        /* modem status interrupts */
+        old_cr &= ~CR_MSIE;
+        if (UART_ENABLE_MS(port, termios->c_cflag))
+                old_cr |= CR_MSIE;
+
+        writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
+        writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
+        writel(line_cr, port->membase + UART_LINE_CR);
+
+        writel(rts_cr, port->membase + UART_RTS_CR);
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= SR_PE;
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= SR_BE;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= SR_PE;
+        }
+
+        port->read_status_mask = 0;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= SR_BE;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= SR_PE | SR_FE;
+
+        writel(old_cr, port->membase + UART_CR);
+
+        spin_unlock_irq(&port->lock);
+}
+
+static const char *netx_type(struct uart_port *port)
+{
+        return port->type == PORT_NETX ? "NETX" : NULL;
+}
+
+static void netx_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, UART_PORT_SIZE);
+}
+
+static int netx_request_port(struct uart_port *port)
+{
+        return request_mem_region(port->mapbase, UART_PORT_SIZE,
+                        DRIVER_NAME) != NULL ? 0 : -EBUSY;
+}
+
+static void netx_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
+                port->type = PORT_NETX;
+}
+
+static int
+netx_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
+                ret = -EINVAL;
+
+        return ret;
+}
+
+static struct uart_ops netx_pops = {
+        .tx_empty       = netx_tx_empty,
+        .set_mctrl      = netx_set_mctrl,
+        .get_mctrl      = netx_get_mctrl,
+        .stop_tx        = netx_stop_tx,
+        .start_tx       = netx_start_tx,
+        .stop_rx        = netx_stop_rx,
+        .enable_ms      = netx_enable_ms,
+        .break_ctl      = netx_break_ctl,
+        .startup        = netx_startup,
+        .shutdown       = netx_shutdown,
+        .set_termios    = netx_set_termios,
+        .type           = netx_type,
+        .release_port   = netx_release_port,
+        .request_port   = netx_request_port,
+        .config_port    = netx_config_port,
+        .verify_port    = netx_verify_port,
+};
+
+static struct netx_port netx_ports[] = {
+        {
+        .port = {
+                .type = PORT_NETX,
+                .iotype = UPIO_MEM,
+                .membase = (char __iomem *)io_p2v(NETX_PA_UART0),
+                .mapbase = NETX_PA_UART0,
+                .irq = NETX_IRQ_UART0,
+                .uartclk = 100000000,
+                .fifosize = 16,
+                .flags = UPF_BOOT_AUTOCONF,
+                .ops = &netx_pops,
+                .line = 0,
+        },
+        }, {
+        .port = {
+                .type = PORT_NETX,
+                .iotype = UPIO_MEM,
+                .membase = (char __iomem *)io_p2v(NETX_PA_UART1),
+                .mapbase = NETX_PA_UART1,
+                .irq = NETX_IRQ_UART1,
+                .uartclk = 100000000,
+                .fifosize = 16,
+                .flags = UPF_BOOT_AUTOCONF,
+                .ops = &netx_pops,
+                .line = 1,
+        },
+        }, {
+        .port = {
+                .type = PORT_NETX,
+                .iotype = UPIO_MEM,
+                .membase = (char __iomem *)io_p2v(NETX_PA_UART2),
+                .mapbase = NETX_PA_UART2,
+                .irq = NETX_IRQ_UART2,
+                .uartclk = 100000000,
+                .fifosize = 16,
+                .flags = UPF_BOOT_AUTOCONF,
+                .ops = &netx_pops,
+                .line = 2,
+        },
+        }
+};
+
+#ifdef CONFIG_SERIAL_NETX_CONSOLE
+
+static void netx_console_putchar(struct uart_port *port, int ch)
+{
+        while (readl(port->membase + UART_FR) & FR_BUSY);
+        writel(ch, port->membase + UART_DR);
+}
+
+static void
+netx_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_port *port = &netx_ports[co->index].port;
+        unsigned char cr_save;
+
+        cr_save = readl(port->membase + UART_CR);
+        writel(cr_save | CR_UART_EN, port->membase + UART_CR);
+
+        uart_console_write(port, s, count, netx_console_putchar);
+
+        while (readl(port->membase + UART_FR) & FR_BUSY);
+        writel(cr_save, port->membase + UART_CR);
+}
+
+static void __init
+netx_console_get_options(struct uart_port *port, int *baud,
+                        int *parity, int *bits, int *flow)
+{
+        unsigned char line_cr;
+
+        *baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
+                readl(port->membase + UART_BAUDDIV_LSB);
+        *baud *= 1000;
+        *baud /= 4096;
+        *baud *= 1000;
+        *baud /= 256;
+        *baud *= 100;
+
+        line_cr = readl(port->membase + UART_LINE_CR);
+        *parity = 'n';
+        if (line_cr & LINE_CR_PEN) {
+                if (line_cr & LINE_CR_EPS)
+                        *parity = 'e';
+                else
+                        *parity = 'o';
+        }
+
+        switch (line_cr & LINE_CR_BITS_MASK) {
+        case LINE_CR_8BIT:
+                *bits = 8;
+                break;
+        case LINE_CR_7BIT:
+                *bits = 7;
+                break;
+        case LINE_CR_6BIT:
+                *bits = 6;
+                break;
+        case LINE_CR_5BIT:
+                *bits = 5;
+                break;
+        }
+
+        if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
+                *flow = 'r';
+}
+
+static int __init
+netx_console_setup(struct console *co, char *options)
+{
+        struct netx_port *sport;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
+                co->index = 0;
+        sport = &netx_ports[co->index];
+
+        if (options) {
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        } else {
+                /* if the UART is enabled, assume it has been correctly setup
+                 * by the bootloader and get the options
+                 */
+                if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
+                        netx_console_get_options(&sport->port, &baud,
+                        &parity, &bits, &flow);
+                }
+
+        }
+
+        return uart_set_options(&sport->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver netx_reg;
+static struct console netx_console = {
+        .name           = "ttyNX",
+        .write          = netx_console_write,
+        .device         = uart_console_device,
+        .setup          = netx_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &netx_reg,
+};
+
+static int __init netx_console_init(void)
+{
+        register_console(&netx_console);
+        return 0;
+}
+console_initcall(netx_console_init);
+
+#define NETX_CONSOLE    &netx_console
+#else
+#define NETX_CONSOLE    NULL
+#endif
+
+static struct uart_driver netx_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = DRIVER_NAME,
+        .dev_name       = "ttyNX",
+        .major          = SERIAL_NX_MAJOR,
+        .minor          = MINOR_START,
+        .nr             = ARRAY_SIZE(netx_ports),
+        .cons           = NETX_CONSOLE,
+};
+
+static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct netx_port *sport = platform_get_drvdata(pdev);
+
+        if (sport)
+                uart_suspend_port(&netx_reg, &sport->port);
+
+        return 0;
+}
+
+static int serial_netx_resume(struct platform_device *pdev)
+{
+        struct netx_port *sport = platform_get_drvdata(pdev);
+
+        if (sport)
+                uart_resume_port(&netx_reg, &sport->port);
+
+        return 0;
+}
+
+static int serial_netx_probe(struct platform_device *pdev)
+{
+        struct uart_port *port = &netx_ports[pdev->id].port;
+
+        dev_info(&pdev->dev, "initialising\n");
+
+        port->dev = &pdev->dev;
+
+        writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
+        uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
+        platform_set_drvdata(pdev, &netx_ports[pdev->id]);
+
+        return 0;
+}
+
+static int serial_netx_remove(struct platform_device *pdev)
+{
+        struct netx_port *sport = platform_get_drvdata(pdev);
+
+        platform_set_drvdata(pdev, NULL);
+
+        if (sport)
+                uart_remove_one_port(&netx_reg, &sport->port);
+
+        return 0;
+}
+
+static struct platform_driver serial_netx_driver = {
+        .probe          = serial_netx_probe,
+        .remove         = serial_netx_remove,
+
+        .suspend        = serial_netx_suspend,
+        .resume         = serial_netx_resume,
+
+        .driver         = {
+                .name   = DRIVER_NAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init netx_serial_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: NetX driver\n");
+
+        ret = uart_register_driver(&netx_reg);
+        if (ret)
+                return ret;
+
+        ret = platform_driver_register(&serial_netx_driver);
+        if (ret != 0)
+                uart_unregister_driver(&netx_reg);
+
+        return 0;
+}
+
+static void __exit netx_serial_exit(void)
+{
+        platform_driver_unregister(&serial_netx_driver);
+        uart_unregister_driver(&netx_reg);
+}
+
+module_init(netx_serial_init);
+module_exit(netx_serial_exit);
+
+MODULE_AUTHOR("Sascha Hauer");
+MODULE_DESCRIPTION("NetX serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
diff --git a/drivers/tty/serial/nwpserial.c b/drivers/tty/serial/nwpserial.c
new file mode 100644
index 000000000000..de173671e3d0
--- /dev/null
+++ b/drivers/tty/serial/nwpserial.c
@@ -0,0 +1,477 @@
+/*
+ *  Serial Port driver for a NWP uart device
+ *
+ *    Copyright (C) 2008 IBM Corp., Benjamin Krill <ben@codiert.org>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/serial.h>
+#include <linux/serial_reg.h>
+#include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/irqreturn.h>
+#include <linux/mutex.h>
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+#include <linux/nwpserial.h>
+#include <asm/prom.h>
+#include <asm/dcr.h>
+
+#define NWPSERIAL_NR               2
+
+#define NWPSERIAL_STATUS_RXVALID 0x1
+#define NWPSERIAL_STATUS_TXFULL  0x2
+
+struct nwpserial_port {
+        struct uart_port port;
+        dcr_host_t dcr_host;
+        unsigned int ier;
+        unsigned int mcr;
+};
+
+static DEFINE_MUTEX(nwpserial_mutex);
+static struct nwpserial_port nwpserial_ports[NWPSERIAL_NR];
+
+static void wait_for_bits(struct nwpserial_port *up, int bits)
+{
+        unsigned int status, tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        do {
+                status = dcr_read(up->dcr_host, UART_LSR);
+
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while ((status & bits) != bits);
+}
+
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL_CONSOLE
+static void nwpserial_console_putchar(struct uart_port *port, int c)
+{
+        struct nwpserial_port *up;
+        up = container_of(port, struct nwpserial_port, port);
+        /* check if tx buffer is full */
+        wait_for_bits(up, UART_LSR_THRE);
+        dcr_write(up->dcr_host, UART_TX, c);
+        up->port.icount.tx++;
+}
+
+static void
+nwpserial_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct nwpserial_port *up = &nwpserial_ports[co->index];
+        unsigned long flags;
+        int locked = 1;
+
+        if (oops_in_progress)
+                locked = spin_trylock_irqsave(&up->port.lock, flags);
+        else
+                spin_lock_irqsave(&up->port.lock, flags);
+
+        /* save and disable interrupt */
+        up->ier = dcr_read(up->dcr_host, UART_IER);
+        dcr_write(up->dcr_host, UART_IER, up->ier & ~UART_IER_RDI);
+
+        uart_console_write(&up->port, s, count, nwpserial_console_putchar);
+
+        /* wait for transmitter to become empty */
+        while ((dcr_read(up->dcr_host, UART_LSR) & UART_LSR_THRE) == 0)
+                cpu_relax();
+
+        /* restore interrupt state */
+        dcr_write(up->dcr_host, UART_IER, up->ier);
+
+        if (locked)
+                spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static struct uart_driver nwpserial_reg;
+static struct console nwpserial_console = {
+        .name           = "ttySQ",
+        .write          = nwpserial_console_write,
+        .device         = uart_console_device,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &nwpserial_reg,
+};
+#define NWPSERIAL_CONSOLE       (&nwpserial_console)
+#else
+#define NWPSERIAL_CONSOLE       NULL
+#endif /* CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL_CONSOLE */
+
+/**************************************************************************/
+
+static int nwpserial_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void nwpserial_release_port(struct uart_port *port)
+{
+        /* N/A */
+}
+
+static void nwpserial_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_NWPSERIAL;
+}
+
+static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
+{
+        struct nwpserial_port *up = dev_id;
+        struct tty_struct *tty = up->port.state->port.tty;
+        irqreturn_t ret;
+        unsigned int iir;
+        unsigned char ch;
+
+        spin_lock(&up->port.lock);
+
+        /* check if the uart was the interrupt source. */
+        iir = dcr_read(up->dcr_host, UART_IIR);
+        if (!iir) {
+                ret = IRQ_NONE;
+                goto out;
+        }
+
+        do {
+                up->port.icount.rx++;
+                ch = dcr_read(up->dcr_host, UART_RX);
+                if (up->port.ignore_status_mask != NWPSERIAL_STATUS_RXVALID)
+                        tty_insert_flip_char(tty, ch, TTY_NORMAL);
+        } while (dcr_read(up->dcr_host, UART_LSR) & UART_LSR_DR);
+
+        tty_flip_buffer_push(tty);
+        ret = IRQ_HANDLED;
+
+        /* clear interrupt */
+        dcr_write(up->dcr_host, UART_IIR, 1);
+out:
+        spin_unlock(&up->port.lock);
+        return ret;
+}
+
+static int nwpserial_startup(struct uart_port *port)
+{
+        struct nwpserial_port *up;
+        int err;
+
+        up = container_of(port, struct nwpserial_port, port);
+
+        /* disable flow control by default */
+        up->mcr = dcr_read(up->dcr_host, UART_MCR) & ~UART_MCR_AFE;
+        dcr_write(up->dcr_host, UART_MCR, up->mcr);
+
+        /* register interrupt handler */
+        err = request_irq(up->port.irq, nwpserial_interrupt,
+                        IRQF_SHARED, "nwpserial", up);
+        if (err)
+                return err;
+
+        /* enable interrupts */
+        up->ier = UART_IER_RDI;
+        dcr_write(up->dcr_host, UART_IER, up->ier);
+
+        /* enable receiving */
+        up->port.ignore_status_mask &= ~NWPSERIAL_STATUS_RXVALID;
+
+        return 0;
+}
+
+static void nwpserial_shutdown(struct uart_port *port)
+{
+        struct nwpserial_port *up;
+        up = container_of(port, struct nwpserial_port, port);
+
+        /* disable receiving */
+        up->port.ignore_status_mask |= NWPSERIAL_STATUS_RXVALID;
+
+        /* disable interrupts from this port */
+        up->ier = 0;
+        dcr_write(up->dcr_host, UART_IER, up->ier);
+
+        /* free irq */
+        free_irq(up->port.irq, port);
+}
+
+static int nwpserial_verify_port(struct uart_port *port,
+                        struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+static const char *nwpserial_type(struct uart_port *port)
+{
+        return port->type == PORT_NWPSERIAL ? "nwpserial" : NULL;
+}
+
+static void nwpserial_set_termios(struct uart_port *port,
+                        struct ktermios *termios, struct ktermios *old)
+{
+        struct nwpserial_port *up;
+        up = container_of(port, struct nwpserial_port, port);
+
+        up->port.read_status_mask = NWPSERIAL_STATUS_RXVALID
+                                | NWPSERIAL_STATUS_TXFULL;
+
+        up->port.ignore_status_mask = 0;
+        /* ignore all characters if CREAD is not set */
+        if ((termios->c_cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= NWPSERIAL_STATUS_RXVALID;
+
+        /* Copy back the old hardware settings */
+        if (old)
+                tty_termios_copy_hw(termios, old);
+}
+
+static void nwpserial_break_ctl(struct uart_port *port, int ctl)
+{
+        /* N/A */
+}
+
+static void nwpserial_enable_ms(struct uart_port *port)
+{
+        /* N/A */
+}
+
+static void nwpserial_stop_rx(struct uart_port *port)
+{
+        struct nwpserial_port *up;
+        up = container_of(port, struct nwpserial_port, port);
+        /* don't forward any more data (like !CREAD) */
+        up->port.ignore_status_mask = NWPSERIAL_STATUS_RXVALID;
+}
+
+static void nwpserial_putchar(struct nwpserial_port *up, unsigned char c)
+{
+        /* check if tx buffer is full */
+        wait_for_bits(up, UART_LSR_THRE);
+        dcr_write(up->dcr_host, UART_TX, c);
+        up->port.icount.tx++;
+}
+
+static void nwpserial_start_tx(struct uart_port *port)
+{
+        struct nwpserial_port *up;
+        struct circ_buf *xmit;
+        up = container_of(port, struct nwpserial_port, port);
+        xmit  = &up->port.state->xmit;
+
+        if (port->x_char) {
+                nwpserial_putchar(up, up->port.x_char);
+                port->x_char = 0;
+        }
+
+        while (!(uart_circ_empty(xmit) || uart_tx_stopped(&up->port))) {
+                nwpserial_putchar(up, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
+        }
+}
+
+static unsigned int nwpserial_get_mctrl(struct uart_port *port)
+{
+        return 0;
+}
+
+static void nwpserial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        /* N/A */
+}
+
+static void nwpserial_stop_tx(struct uart_port *port)
+{
+        /* N/A */
+}
+
+static unsigned int nwpserial_tx_empty(struct uart_port *port)
+{
+        struct nwpserial_port *up;
+        unsigned long flags;
+        int ret;
+        up = container_of(port, struct nwpserial_port, port);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        ret = dcr_read(up->dcr_host, UART_LSR);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return ret & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+}
+
+static struct uart_ops nwpserial_pops = {
+        .tx_empty     = nwpserial_tx_empty,
+        .set_mctrl    = nwpserial_set_mctrl,
+        .get_mctrl    = nwpserial_get_mctrl,
+        .stop_tx      = nwpserial_stop_tx,
+        .start_tx     = nwpserial_start_tx,
+        .stop_rx      = nwpserial_stop_rx,
+        .enable_ms    = nwpserial_enable_ms,
+        .break_ctl    = nwpserial_break_ctl,
+        .startup      = nwpserial_startup,
+        .shutdown     = nwpserial_shutdown,
+        .set_termios  = nwpserial_set_termios,
+        .type         = nwpserial_type,
+        .release_port = nwpserial_release_port,
+        .request_port = nwpserial_request_port,
+        .config_port  = nwpserial_config_port,
+        .verify_port  = nwpserial_verify_port,
+};
+
+static struct uart_driver nwpserial_reg = {
+        .owner       = THIS_MODULE,
+        .driver_name = "nwpserial",
+        .dev_name    = "ttySQ",
+        .major       = TTY_MAJOR,
+        .minor       = 68,
+        .nr          = NWPSERIAL_NR,
+        .cons        = NWPSERIAL_CONSOLE,
+};
+
+int nwpserial_register_port(struct uart_port *port)
+{
+        struct nwpserial_port *up = NULL;
+        int ret = -1;
+        int i;
+        static int first = 1;
+        int dcr_len;
+        int dcr_base;
+        struct device_node *dn;
+
+        mutex_lock(&nwpserial_mutex);
+
+        dn = port->dev->of_node;
+        if (dn == NULL)
+                goto out;
+
+        /* get dcr base. */
+        dcr_base = dcr_resource_start(dn, 0);
+
+        /* find matching entry */
+        for (i = 0; i < NWPSERIAL_NR; i++)
+                if (nwpserial_ports[i].port.iobase == dcr_base) {
+                        up = &nwpserial_ports[i];
+                        break;
+                }
+
+        /* we didn't find a mtching entry, search for a free port */
+        if (up == NULL)
+                for (i = 0; i < NWPSERIAL_NR; i++)
+                        if (nwpserial_ports[i].port.type == PORT_UNKNOWN &&
+                                nwpserial_ports[i].port.iobase == 0) {
+                                up = &nwpserial_ports[i];
+                                break;
+                        }
+
+        if (up == NULL) {
+                ret = -EBUSY;
+                goto out;
+        }
+
+        if (first)
+                uart_register_driver(&nwpserial_reg);
+        first = 0;
+
+        up->port.membase      = port->membase;
+        up->port.irq          = port->irq;
+        up->port.uartclk      = port->uartclk;
+        up->port.fifosize     = port->fifosize;
+        up->port.regshift     = port->regshift;
+        up->port.iotype       = port->iotype;
+        up->port.flags        = port->flags;
+        up->port.mapbase      = port->mapbase;
+        up->port.private_data = port->private_data;
+
+        if (port->dev)
+                up->port.dev = port->dev;
+
+        if (up->port.iobase != dcr_base) {
+                up->port.ops          = &nwpserial_pops;
+                up->port.fifosize     = 16;
+
+                spin_lock_init(&up->port.lock);
+
+                up->port.iobase = dcr_base;
+                dcr_len = dcr_resource_len(dn, 0);
+
+                up->dcr_host = dcr_map(dn, dcr_base, dcr_len);
+                if (!DCR_MAP_OK(up->dcr_host)) {
+                        printk(KERN_ERR "Cannot map DCR resources for NWPSERIAL");
+                        goto out;
+                }
+        }
+
+        ret = uart_add_one_port(&nwpserial_reg, &up->port);
+        if (ret == 0)
+                ret = up->port.line;
+
+out:
+        mutex_unlock(&nwpserial_mutex);
+
+        return ret;
+}
+EXPORT_SYMBOL(nwpserial_register_port);
+
+void nwpserial_unregister_port(int line)
+{
+        struct nwpserial_port *up = &nwpserial_ports[line];
+        mutex_lock(&nwpserial_mutex);
+        uart_remove_one_port(&nwpserial_reg, &up->port);
+
+        up->port.type = PORT_UNKNOWN;
+
+        mutex_unlock(&nwpserial_mutex);
+}
+EXPORT_SYMBOL(nwpserial_unregister_port);
+
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL_CONSOLE
+static int __init nwpserial_console_init(void)
+{
+        struct nwpserial_port *up = NULL;
+        struct device_node *dn;
+        const char *name;
+        int dcr_base;
+        int dcr_len;
+        int i;
+
+        /* search for a free port */
+        for (i = 0; i < NWPSERIAL_NR; i++)
+                if (nwpserial_ports[i].port.type == PORT_UNKNOWN) {
+                        up = &nwpserial_ports[i];
+                        break;
+                }
+
+        if (up == NULL)
+                return -1;
+
+        name = of_get_property(of_chosen, "linux,stdout-path", NULL);
+        if (name == NULL)
+                return -1;
+
+        dn = of_find_node_by_path(name);
+        if (!dn)
+                return -1;
+
+        spin_lock_init(&up->port.lock);
+        up->port.ops = &nwpserial_pops;
+        up->port.type = PORT_NWPSERIAL;
+        up->port.fifosize = 16;
+
+        dcr_base = dcr_resource_start(dn, 0);
+        dcr_len = dcr_resource_len(dn, 0);
+        up->port.iobase = dcr_base;
+
+        up->dcr_host = dcr_map(dn, dcr_base, dcr_len);
+        if (!DCR_MAP_OK(up->dcr_host)) {
+                printk("Cannot map DCR resources for SERIAL");
+                return -1;
+        }
+        register_console(&nwpserial_console);
+        return 0;
+}
+console_initcall(nwpserial_console_init);
+#endif /* CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL_CONSOLE */
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
new file mode 100644
index 000000000000..c911b2419abb
--- /dev/null
+++ b/drivers/tty/serial/of_serial.c
@@ -0,0 +1,206 @@
+/*
+ *  Serial Port driver for Open Firmware platform devices
+ *
+ *    Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>, IBM Corp.
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/nwpserial.h>
+
+struct of_serial_info {
+        int type;
+        int line;
+};
+
+/*
+ * Fill a struct uart_port for a given device node
+ */
+static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
+                                        int type, struct uart_port *port)
+{
+        struct resource resource;
+        struct device_node *np = ofdev->dev.of_node;
+        const __be32 *clk, *spd;
+        const __be32 *prop;
+        int ret, prop_size;
+
+        memset(port, 0, sizeof *port);
+        spd = of_get_property(np, "current-speed", NULL);
+        clk = of_get_property(np, "clock-frequency", NULL);
+        if (!clk) {
+                dev_warn(&ofdev->dev, "no clock-frequency property set\n");
+                return -ENODEV;
+        }
+
+        ret = of_address_to_resource(np, 0, &resource);
+        if (ret) {
+                dev_warn(&ofdev->dev, "invalid address\n");
+                return ret;
+        }
+
+        spin_lock_init(&port->lock);
+        port->mapbase = resource.start;
+
+        /* Check for shifted address mapping */
+        prop = of_get_property(np, "reg-offset", &prop_size);
+        if (prop && (prop_size == sizeof(u32)))
+                port->mapbase += be32_to_cpup(prop);
+
+        /* Check for registers offset within the devices address range */
+        prop = of_get_property(np, "reg-shift", &prop_size);
+        if (prop && (prop_size == sizeof(u32)))
+                port->regshift = be32_to_cpup(prop);
+
+        port->irq = irq_of_parse_and_map(np, 0);
+        port->iotype = UPIO_MEM;
+        port->type = type;
+        port->uartclk = be32_to_cpup(clk);
+        port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
+                | UPF_FIXED_PORT | UPF_FIXED_TYPE;
+        port->dev = &ofdev->dev;
+        /* If current-speed was set, then try not to change it. */
+        if (spd)
+                port->custom_divisor = be32_to_cpup(clk) / (16 * (be32_to_cpup(spd)));
+
+        return 0;
+}
+
+/*
+ * Try to register a serial port
+ */
+static struct of_device_id of_platform_serial_table[];
+static int __devinit of_platform_serial_probe(struct platform_device *ofdev)
+{
+        const struct of_device_id *match;
+        struct of_serial_info *info;
+        struct uart_port port;
+        int port_type;
+        int ret;
+
+        match = of_match_device(of_platform_serial_table, &ofdev->dev);
+        if (!match)
+                return -EINVAL;
+
+        if (of_find_property(ofdev->dev.of_node, "used-by-rtas", NULL))
+                return -EBUSY;
+
+        info = kmalloc(sizeof(*info), GFP_KERNEL);
+        if (info == NULL)
+                return -ENOMEM;
+
+        port_type = (unsigned long)match->data;
+        ret = of_platform_serial_setup(ofdev, port_type, &port);
+        if (ret)
+                goto out;
+
+        switch (port_type) {
+#ifdef CONFIG_SERIAL_8250
+        case PORT_8250 ... PORT_MAX_8250:
+                ret = serial8250_register_port(&port);
+                break;
+#endif
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
+        case PORT_NWPSERIAL:
+                ret = nwpserial_register_port(&port);
+                break;
+#endif
+        default:
+                /* need to add code for these */
+        case PORT_UNKNOWN:
+                dev_info(&ofdev->dev, "Unknown serial port found, ignored\n");
+                ret = -ENODEV;
+                break;
+        }
+        if (ret < 0)
+                goto out;
+
+        info->type = port_type;
+        info->line = ret;
+        dev_set_drvdata(&ofdev->dev, info);
+        return 0;
+out:
+        kfree(info);
+        irq_dispose_mapping(port.irq);
+        return ret;
+}
+
+/*
+ * Release a line
+ */
+static int of_platform_serial_remove(struct platform_device *ofdev)
+{
+        struct of_serial_info *info = dev_get_drvdata(&ofdev->dev);
+        switch (info->type) {
+#ifdef CONFIG_SERIAL_8250
+        case PORT_8250 ... PORT_MAX_8250:
+                serial8250_unregister_port(info->line);
+                break;
+#endif
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
+        case PORT_NWPSERIAL:
+                nwpserial_unregister_port(info->line);
+                break;
+#endif
+        default:
+                /* need to add code for these */
+                break;
+        }
+        kfree(info);
+        return 0;
+}
+
+/*
+ * A few common types, add more as needed.
+ */
+static struct of_device_id __devinitdata of_platform_serial_table[] = {
+        { .compatible = "ns8250",   .data = (void *)PORT_8250, },
+        { .compatible = "ns16450",  .data = (void *)PORT_16450, },
+        { .compatible = "ns16550a", .data = (void *)PORT_16550A, },
+        { .compatible = "ns16550",  .data = (void *)PORT_16550, },
+        { .compatible = "ns16750",  .data = (void *)PORT_16750, },
+        { .compatible = "ns16850",  .data = (void *)PORT_16850, },
+#ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL
+        { .compatible = "ibm,qpace-nwp-serial",
+                .data = (void *)PORT_NWPSERIAL, },
+#endif
+        { .type = "serial",         .data = (void *)PORT_UNKNOWN, },
+        { /* end of list */ },
+};
+
+static struct platform_driver of_platform_serial_driver = {
+        .driver = {
+                .name = "of_serial",
+                .owner = THIS_MODULE,
+                .of_match_table = of_platform_serial_table,
+        },
+        .probe = of_platform_serial_probe,
+        .remove = of_platform_serial_remove,
+};
+
+static int __init of_platform_serial_init(void)
+{
+        return platform_driver_register(&of_platform_serial_driver);
+}
+module_init(of_platform_serial_init);
+
+static void __exit of_platform_serial_exit(void)
+{
+        return platform_driver_unregister(&of_platform_serial_driver);
+};
+module_exit(of_platform_serial_exit);
+
+MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Serial Port driver for Open Firmware platform devices");
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
new file mode 100644
index 000000000000..47cadf474149
--- /dev/null
+++ b/drivers/tty/serial/omap-serial.c
@@ -0,0 +1,1362 @@
+/*
+ * Driver for OMAP-UART controller.
+ * Based on drivers/serial/8250.c
+ *
+ * Copyright (C) 2010 Texas Instruments.
+ *
+ * Authors:
+ *      Govindraj R     <govindraj.raja@ti.com>
+ *      Thara Gopinath  <thara@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Note: This driver is made separate from 8250 driver as we cannot
+ * over load 8250 driver with omap platform specific configuration for
+ * features like DMA, it makes easier to implement features like DMA and
+ * hardware flow control and software flow control configuration with
+ * this driver as required for the omap-platform.
+ */
+
+#if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/serial_reg.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/serial_core.h>
+#include <linux/irq.h>
+
+#include <plat/dma.h>
+#include <plat/dmtimer.h>
+#include <plat/omap-serial.h>
+
+static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
+
+/* Forward declaration of functions */
+static void uart_tx_dma_callback(int lch, u16 ch_status, void *data);
+static void serial_omap_rx_timeout(unsigned long uart_no);
+static int serial_omap_start_rxdma(struct uart_omap_port *up);
+
+static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
+{
+        offset <<= up->port.regshift;
+        return readw(up->port.membase + offset);
+}
+
+static inline void serial_out(struct uart_omap_port *up, int offset, int value)
+{
+        offset <<= up->port.regshift;
+        writew(value, up->port.membase + offset);
+}
+
+static inline void serial_omap_clear_fifos(struct uart_omap_port *up)
+{
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                       UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+        serial_out(up, UART_FCR, 0);
+}
+
+/*
+ * serial_omap_get_divisor - calculate divisor value
+ * @port: uart port info
+ * @baud: baudrate for which divisor needs to be calculated.
+ *
+ * We have written our own function to get the divisor so as to support
+ * 13x mode. 3Mbps Baudrate as an different divisor.
+ * Reference OMAP TRM Chapter 17:
+ * Table 17-1. UART Mode Baud Rates, Divisor Values, and Error Rates
+ * referring to oversampling - divisor value
+ * baudrate 460,800 to 3,686,400 all have divisor 13
+ * except 3,000,000 which has divisor value 16
+ */
+static unsigned int
+serial_omap_get_divisor(struct uart_port *port, unsigned int baud)
+{
+        unsigned int divisor;
+
+        if (baud > OMAP_MODE13X_SPEED && baud != 3000000)
+                divisor = 13;
+        else
+                divisor = 16;
+        return port->uartclk/(baud * divisor);
+}
+
+static void serial_omap_stop_rxdma(struct uart_omap_port *up)
+{
+        if (up->uart_dma.rx_dma_used) {
+                del_timer(&up->uart_dma.rx_timer);
+                omap_stop_dma(up->uart_dma.rx_dma_channel);
+                omap_free_dma(up->uart_dma.rx_dma_channel);
+                up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
+                up->uart_dma.rx_dma_used = false;
+        }
+}
+
+static void serial_omap_enable_ms(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+        dev_dbg(up->port.dev, "serial_omap_enable_ms+%d\n", up->pdev->id);
+        up->ier |= UART_IER_MSI;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static void serial_omap_stop_tx(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+        if (up->use_dma &&
+                up->uart_dma.tx_dma_channel != OMAP_UART_DMA_CH_FREE) {
+                /*
+                 * Check if dma is still active. If yes do nothing,
+                 * return. Else stop dma
+                 */
+                if (omap_get_dma_active_status(up->uart_dma.tx_dma_channel))
+                        return;
+                omap_stop_dma(up->uart_dma.tx_dma_channel);
+                omap_free_dma(up->uart_dma.tx_dma_channel);
+                up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
+        }
+
+        if (up->ier & UART_IER_THRI) {
+                up->ier &= ~UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+static void serial_omap_stop_rx(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+        if (up->use_dma)
+                serial_omap_stop_rxdma(up);
+        up->ier &= ~UART_IER_RLSI;
+        up->port.read_status_mask &= ~UART_LSR_DR;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static inline void receive_chars(struct uart_omap_port *up, int *status)
+{
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned int flag;
+        unsigned char ch, lsr = *status;
+        int max_count = 256;
+
+        do {
+                if (likely(lsr & UART_LSR_DR))
+                        ch = serial_in(up, UART_RX);
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                if (unlikely(lsr & UART_LSR_BRK_ERROR_BITS)) {
+                        /*
+                         * For statistics only
+                         */
+                        if (lsr & UART_LSR_BI) {
+                                lsr &= ~(UART_LSR_FE | UART_LSR_PE);
+                                up->port.icount.brk++;
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        goto ignore_char;
+                        } else if (lsr & UART_LSR_PE) {
+                                up->port.icount.parity++;
+                        } else if (lsr & UART_LSR_FE) {
+                                up->port.icount.frame++;
+                        }
+
+                        if (lsr & UART_LSR_OE)
+                                up->port.icount.overrun++;
+
+                        /*
+                         * Mask off conditions which should be ignored.
+                         */
+                        lsr &= up->port.read_status_mask;
+
+#ifdef CONFIG_SERIAL_OMAP_CONSOLE
+                        if (up->port.line == up->port.cons->index) {
+                                /* Recover the break flag from console xmit */
+                                lsr |= up->lsr_break_flag;
+                        }
+#endif
+                        if (lsr & UART_LSR_BI)
+                                flag = TTY_BREAK;
+                        else if (lsr & UART_LSR_PE)
+                                flag = TTY_PARITY;
+                        else if (lsr & UART_LSR_FE)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        goto ignore_char;
+                uart_insert_char(&up->port, lsr, UART_LSR_OE, ch, flag);
+ignore_char:
+                lsr = serial_in(up, UART_LSR);
+        } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0));
+        spin_unlock(&up->port.lock);
+        tty_flip_buffer_push(tty);
+        spin_lock(&up->port.lock);
+}
+
+static void transmit_chars(struct uart_omap_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int count;
+
+        if (up->port.x_char) {
+                serial_out(up, UART_TX, up->port.x_char);
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+                serial_omap_stop_tx(&up->port);
+                return;
+        }
+        count = up->port.fifosize / 4;
+        do {
+                serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        if (uart_circ_empty(xmit))
+                serial_omap_stop_tx(&up->port);
+}
+
+static inline void serial_omap_enable_ier_thri(struct uart_omap_port *up)
+{
+        if (!(up->ier & UART_IER_THRI)) {
+                up->ier |= UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+static void serial_omap_start_tx(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        struct circ_buf *xmit;
+        unsigned int start;
+        int ret = 0;
+
+        if (!up->use_dma) {
+                serial_omap_enable_ier_thri(up);
+                return;
+        }
+
+        if (up->uart_dma.tx_dma_used)
+                return;
+
+        xmit = &up->port.state->xmit;
+
+        if (up->uart_dma.tx_dma_channel == OMAP_UART_DMA_CH_FREE) {
+                ret = omap_request_dma(up->uart_dma.uart_dma_tx,
+                                "UART Tx DMA",
+                                (void *)uart_tx_dma_callback, up,
+                                &(up->uart_dma.tx_dma_channel));
+
+                if (ret < 0) {
+                        serial_omap_enable_ier_thri(up);
+                        return;
+                }
+        }
+        spin_lock(&(up->uart_dma.tx_lock));
+        up->uart_dma.tx_dma_used = true;
+        spin_unlock(&(up->uart_dma.tx_lock));
+
+        start = up->uart_dma.tx_buf_dma_phys +
+                                (xmit->tail & (UART_XMIT_SIZE - 1));
+
+        up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
+        /*
+         * It is a circular buffer. See if the buffer has wounded back.
+         * If yes it will have to be transferred in two separate dma
+         * transfers
+         */
+        if (start + up->uart_dma.tx_buf_size >=
+                        up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
+                up->uart_dma.tx_buf_size =
+                        (up->uart_dma.tx_buf_dma_phys +
+                        UART_XMIT_SIZE) - start;
+
+        omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
+                                OMAP_DMA_AMODE_CONSTANT,
+                                up->uart_dma.uart_base, 0, 0);
+        omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
+                                OMAP_DMA_AMODE_POST_INC, start, 0, 0);
+        omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
+                                OMAP_DMA_DATA_TYPE_S8,
+                                up->uart_dma.tx_buf_size, 1,
+                                OMAP_DMA_SYNC_ELEMENT,
+                                up->uart_dma.uart_dma_tx, 0);
+        /* FIXME: Cache maintenance needed here? */
+        omap_start_dma(up->uart_dma.tx_dma_channel);
+}
+
+static unsigned int check_modem_status(struct uart_omap_port *up)
+{
+        unsigned int status;
+
+        status = serial_in(up, UART_MSR);
+        status |= up->msr_saved_flags;
+        up->msr_saved_flags = 0;
+        if ((status & UART_MSR_ANY_DELTA) == 0)
+                return status;
+
+        if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
+            up->port.state != NULL) {
+                if (status & UART_MSR_TERI)
+                        up->port.icount.rng++;
+                if (status & UART_MSR_DDSR)
+                        up->port.icount.dsr++;
+                if (status & UART_MSR_DDCD)
+                        uart_handle_dcd_change
+                                (&up->port, status & UART_MSR_DCD);
+                if (status & UART_MSR_DCTS)
+                        uart_handle_cts_change
+                                (&up->port, status & UART_MSR_CTS);
+                wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+        }
+
+        return status;
+}
+
+/**
+ * serial_omap_irq() - This handles the interrupt from one port
+ * @irq: uart port irq number
+ * @dev_id: uart port info
+ */
+static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
+{
+        struct uart_omap_port *up = dev_id;
+        unsigned int iir, lsr;
+        unsigned long flags;
+
+        iir = serial_in(up, UART_IIR);
+        if (iir & UART_IIR_NO_INT)
+                return IRQ_NONE;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        lsr = serial_in(up, UART_LSR);
+        if (iir & UART_IIR_RLSI) {
+                if (!up->use_dma) {
+                        if (lsr & UART_LSR_DR)
+                                receive_chars(up, &lsr);
+                } else {
+                        up->ier &= ~(UART_IER_RDI | UART_IER_RLSI);
+                        serial_out(up, UART_IER, up->ier);
+                        if ((serial_omap_start_rxdma(up) != 0) &&
+                                        (lsr & UART_LSR_DR))
+                                receive_chars(up, &lsr);
+                }
+        }
+
+        check_modem_status(up);
+        if ((lsr & UART_LSR_THRE) && (iir & UART_IIR_THRI))
+                transmit_chars(up);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        up->port_activity = jiffies;
+        return IRQ_HANDLED;
+}
+
+static unsigned int serial_omap_tx_empty(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned long flags = 0;
+        unsigned int ret = 0;
+
+        dev_dbg(up->port.dev, "serial_omap_tx_empty+%d\n", up->pdev->id);
+        spin_lock_irqsave(&up->port.lock, flags);
+        ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return ret;
+}
+
+static unsigned int serial_omap_get_mctrl(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned char status;
+        unsigned int ret = 0;
+
+        status = check_modem_status(up);
+        dev_dbg(up->port.dev, "serial_omap_get_mctrl+%d\n", up->pdev->id);
+
+        if (status & UART_MSR_DCD)
+                ret |= TIOCM_CAR;
+        if (status & UART_MSR_RI)
+                ret |= TIOCM_RNG;
+        if (status & UART_MSR_DSR)
+                ret |= TIOCM_DSR;
+        if (status & UART_MSR_CTS)
+                ret |= TIOCM_CTS;
+        return ret;
+}
+
+static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned char mcr = 0;
+
+        dev_dbg(up->port.dev, "serial_omap_set_mctrl+%d\n", up->pdev->id);
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        mcr |= up->mcr;
+        serial_out(up, UART_MCR, mcr);
+}
+
+static void serial_omap_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned long flags = 0;
+
+        dev_dbg(up->port.dev, "serial_omap_break_ctl+%d\n", up->pdev->id);
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (break_state == -1)
+                up->lcr |= UART_LCR_SBC;
+        else
+                up->lcr &= ~UART_LCR_SBC;
+        serial_out(up, UART_LCR, up->lcr);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int serial_omap_startup(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned long flags = 0;
+        int retval;
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(up->port.irq, serial_omap_irq, up->port.irqflags,
+                                up->name, up);
+        if (retval)
+                return retval;
+
+        dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->pdev->id);
+
+        /*
+         * Clear the FIFO buffers and disable them.
+         * (they will be reenabled in set_termios())
+         */
+        serial_omap_clear_fifos(up);
+        /* For Hardware flow control */
+        serial_out(up, UART_MCR, UART_MCR_RTS);
+
+        /*
+         * Clear the interrupt registers.
+         */
+        (void) serial_in(up, UART_LSR);
+        if (serial_in(up, UART_LSR) & UART_LSR_DR)
+                (void) serial_in(up, UART_RX);
+        (void) serial_in(up, UART_IIR);
+        (void) serial_in(up, UART_MSR);
+
+        /*
+         * Now, initialize the UART
+         */
+        serial_out(up, UART_LCR, UART_LCR_WLEN8);
+        spin_lock_irqsave(&up->port.lock, flags);
+        /*
+         * Most PC uarts need OUT2 raised to enable interrupts.
+         */
+        up->port.mctrl |= TIOCM_OUT2;
+        serial_omap_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        up->msr_saved_flags = 0;
+        if (up->use_dma) {
+                free_page((unsigned long)up->port.state->xmit.buf);
+                up->port.state->xmit.buf = dma_alloc_coherent(NULL,
+                        UART_XMIT_SIZE,
+                        (dma_addr_t *)&(up->uart_dma.tx_buf_dma_phys),
+                        0);
+                init_timer(&(up->uart_dma.rx_timer));
+                up->uart_dma.rx_timer.function = serial_omap_rx_timeout;
+                up->uart_dma.rx_timer.data = up->pdev->id;
+                /* Currently the buffer size is 4KB. Can increase it */
+                up->uart_dma.rx_buf = dma_alloc_coherent(NULL,
+                        up->uart_dma.rx_buf_size,
+                        (dma_addr_t *)&(up->uart_dma.rx_buf_dma_phys), 0);
+        }
+        /*
+         * Finally, enable interrupts. Note: Modem status interrupts
+         * are set via set_termios(), which will be occurring imminently
+         * anyway, so we don't enable them here.
+         */
+        up->ier = UART_IER_RLSI | UART_IER_RDI;
+        serial_out(up, UART_IER, up->ier);
+
+        /* Enable module level wake up */
+        serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
+
+        up->port_activity = jiffies;
+        return 0;
+}
+
+static void serial_omap_shutdown(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned long flags = 0;
+
+        dev_dbg(up->port.dev, "serial_omap_shutdown+%d\n", up->pdev->id);
+        /*
+         * Disable interrupts from this port
+         */
+        up->ier = 0;
+        serial_out(up, UART_IER, 0);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        up->port.mctrl &= ~TIOCM_OUT2;
+        serial_omap_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Disable break condition and FIFOs
+         */
+        serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
+        serial_omap_clear_fifos(up);
+
+        /*
+         * Read data port to reset things, and then free the irq
+         */
+        if (serial_in(up, UART_LSR) & UART_LSR_DR)
+                (void) serial_in(up, UART_RX);
+        if (up->use_dma) {
+                dma_free_coherent(up->port.dev,
+                        UART_XMIT_SIZE, up->port.state->xmit.buf,
+                        up->uart_dma.tx_buf_dma_phys);
+                up->port.state->xmit.buf = NULL;
+                serial_omap_stop_rx(port);
+                dma_free_coherent(up->port.dev,
+                        up->uart_dma.rx_buf_size, up->uart_dma.rx_buf,
+                        up->uart_dma.rx_buf_dma_phys);
+                up->uart_dma.rx_buf = NULL;
+        }
+        free_irq(up->port.irq, up);
+}
+
+static inline void
+serial_omap_configure_xonxoff
+                (struct uart_omap_port *up, struct ktermios *termios)
+{
+        unsigned char efr = 0;
+
+        up->lcr = serial_in(up, UART_LCR);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+        up->efr = serial_in(up, UART_EFR);
+        serial_out(up, UART_EFR, up->efr & ~UART_EFR_ECB);
+
+        serial_out(up, UART_XON1, termios->c_cc[VSTART]);
+        serial_out(up, UART_XOFF1, termios->c_cc[VSTOP]);
+
+        /* clear SW control mode bits */
+        efr = up->efr;
+        efr &= OMAP_UART_SW_CLR;
+
+        /*
+         * IXON Flag:
+         * Enable XON/XOFF flow control on output.
+         * Transmit XON1, XOFF1
+         */
+        if (termios->c_iflag & IXON)
+                efr |= OMAP_UART_SW_TX;
+
+        /*
+         * IXOFF Flag:
+         * Enable XON/XOFF flow control on input.
+         * Receiver compares XON1, XOFF1.
+         */
+        if (termios->c_iflag & IXOFF)
+                efr |= OMAP_UART_SW_RX;
+
+        serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
+
+        up->mcr = serial_in(up, UART_MCR);
+
+        /*
+         * IXANY Flag:
+         * Enable any character to restart output.
+         * Operation resumes after receiving any
+         * character after recognition of the XOFF character
+         */
+        if (termios->c_iflag & IXANY)
+                up->mcr |= UART_MCR_XONANY;
+
+        serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+        serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
+        /* Enable special char function UARTi.EFR_REG[5] and
+         * load the new software flow control mode IXON or IXOFF
+         * and restore the UARTi.EFR_REG[4] ENHANCED_EN value.
+         */
+        serial_out(up, UART_EFR, efr | UART_EFR_SCD);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
+
+        serial_out(up, UART_MCR, up->mcr & ~UART_MCR_TCRTLR);
+        serial_out(up, UART_LCR, up->lcr);
+}
+
+static void
+serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
+                        struct ktermios *old)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned char cval = 0;
+        unsigned char efr = 0;
+        unsigned long flags = 0;
+        unsigned int baud, quot;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                cval = UART_LCR_WLEN5;
+                break;
+        case CS6:
+                cval = UART_LCR_WLEN6;
+                break;
+        case CS7:
+                cval = UART_LCR_WLEN7;
+                break;
+        default:
+        case CS8:
+                cval = UART_LCR_WLEN8;
+                break;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                cval |= UART_LCR_STOP;
+        if (termios->c_cflag & PARENB)
+                cval |= UART_LCR_PARITY;
+        if (!(termios->c_cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/13);
+        quot = serial_omap_get_divisor(port, baud);
+
+        up->fcr = UART_FCR_R_TRIG_01 | UART_FCR_T_TRIG_01 |
+                        UART_FCR_ENABLE_FIFO;
+        if (up->use_dma)
+                up->fcr |= UART_FCR_DMA_SELECT;
+
+        /*
+         * Ok, we're now changing the port state. Do it with
+         * interrupts disabled.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+        if (termios->c_iflag & INPCK)
+                up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= UART_LSR_BI;
+
+        /*
+         * Characters to ignore
+         */
+        up->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+        if (termios->c_iflag & IGNBRK) {
+                up->port.ignore_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        up->port.ignore_status_mask |= UART_LSR_OE;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= UART_LSR_DR;
+
+        /*
+         * Modem status interrupts
+         */
+        up->ier &= ~UART_IER_MSI;
+        if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+                up->ier |= UART_IER_MSI;
+        serial_out(up, UART_IER, up->ier);
+        serial_out(up, UART_LCR, cval);         /* reset DLAB */
+
+        /* FIFOs and DMA Settings */
+
+        /* FCR can be changed only when the
+         * baud clock is not running
+         * DLL_REG and DLH_REG set to 0.
+         */
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
+        serial_out(up, UART_DLL, 0);
+        serial_out(up, UART_DLM, 0);
+        serial_out(up, UART_LCR, 0);
+
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
+        up->efr = serial_in(up, UART_EFR);
+        serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
+
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
+        up->mcr = serial_in(up, UART_MCR);
+        serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
+        /* FIFO ENABLE, DMA MODE */
+        serial_out(up, UART_FCR, up->fcr);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
+        if (up->use_dma) {
+                serial_out(up, UART_TI752_TLR, 0);
+                serial_out(up, UART_OMAP_SCR,
+                        (UART_FCR_TRIGGER_4 | UART_FCR_TRIGGER_8));
+        }
+
+        serial_out(up, UART_EFR, up->efr);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
+        serial_out(up, UART_MCR, up->mcr);
+
+        /* Protocol, Baud Rate, and Interrupt Settings */
+
+        serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_DISABLE);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
+        up->efr = serial_in(up, UART_EFR);
+        serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
+
+        serial_out(up, UART_LCR, 0);
+        serial_out(up, UART_IER, 0);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
+        serial_out(up, UART_DLL, quot & 0xff);          /* LS of divisor */
+        serial_out(up, UART_DLM, quot >> 8);            /* MS of divisor */
+
+        serial_out(up, UART_LCR, 0);
+        serial_out(up, UART_IER, up->ier);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+
+        serial_out(up, UART_EFR, up->efr);
+        serial_out(up, UART_LCR, cval);
+
+        if (baud > 230400 && baud != 3000000)
+                serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_13X_MODE);
+        else
+                serial_out(up, UART_OMAP_MDR1, UART_OMAP_MDR1_16X_MODE);
+
+        /* Hardware Flow Control Configuration */
+
+        if (termios->c_cflag & CRTSCTS) {
+                efr |= (UART_EFR_CTS | UART_EFR_RTS);
+                serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
+
+                up->mcr = serial_in(up, UART_MCR);
+                serial_out(up, UART_MCR, up->mcr | UART_MCR_TCRTLR);
+
+                serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+                up->efr = serial_in(up, UART_EFR);
+                serial_out(up, UART_EFR, up->efr | UART_EFR_ECB);
+
+                serial_out(up, UART_TI752_TCR, OMAP_UART_TCR_TRIG);
+                serial_out(up, UART_EFR, efr); /* Enable AUTORTS and AUTOCTS */
+                serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
+                serial_out(up, UART_MCR, up->mcr | UART_MCR_RTS);
+                serial_out(up, UART_LCR, cval);
+        }
+
+        serial_omap_set_mctrl(&up->port, up->port.mctrl);
+        /* Software Flow Control Configuration */
+        if (termios->c_iflag & (IXON | IXOFF))
+                serial_omap_configure_xonxoff(up, termios);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        dev_dbg(up->port.dev, "serial_omap_set_termios+%d\n", up->pdev->id);
+}
+
+static void
+serial_omap_pm(struct uart_port *port, unsigned int state,
+               unsigned int oldstate)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned char efr;
+
+        dev_dbg(up->port.dev, "serial_omap_pm+%d\n", up->pdev->id);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+        efr = serial_in(up, UART_EFR);
+        serial_out(up, UART_EFR, efr | UART_EFR_ECB);
+        serial_out(up, UART_LCR, 0);
+
+        serial_out(up, UART_IER, (state != 0) ? UART_IERX_SLEEP : 0);
+        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
+        serial_out(up, UART_EFR, efr);
+        serial_out(up, UART_LCR, 0);
+}
+
+static void serial_omap_release_port(struct uart_port *port)
+{
+        dev_dbg(port->dev, "serial_omap_release_port+\n");
+}
+
+static int serial_omap_request_port(struct uart_port *port)
+{
+        dev_dbg(port->dev, "serial_omap_request_port+\n");
+        return 0;
+}
+
+static void serial_omap_config_port(struct uart_port *port, int flags)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+        dev_dbg(up->port.dev, "serial_omap_config_port+%d\n",
+                                                        up->pdev->id);
+        up->port.type = PORT_OMAP;
+}
+
+static int
+serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        /* we don't want the core code to modify any port params */
+        dev_dbg(port->dev, "serial_omap_verify_port+\n");
+        return -EINVAL;
+}
+
+static const char *
+serial_omap_type(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+        dev_dbg(up->port.dev, "serial_omap_type+%d\n", up->pdev->id);
+        return up->name;
+}
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+static inline void wait_for_xmitr(struct uart_omap_port *up)
+{
+        unsigned int status, tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        do {
+                status = serial_in(up, UART_LSR);
+
+                if (status & UART_LSR_BI)
+                        up->lsr_break_flag = UART_LSR_BI;
+
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+
+        /* Wait up to 1s for flow control if necessary */
+        if (up->port.flags & UPF_CONS_FLOW) {
+                tmout = 1000000;
+                for (tmout = 1000000; tmout; tmout--) {
+                        unsigned int msr = serial_in(up, UART_MSR);
+
+                        up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
+                        if (msr & UART_MSR_CTS)
+                                break;
+
+                        udelay(1);
+                }
+        }
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+
+static void serial_omap_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        wait_for_xmitr(up);
+        serial_out(up, UART_TX, ch);
+}
+
+static int serial_omap_poll_get_char(struct uart_port *port)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+        unsigned int status = serial_in(up, UART_LSR);
+
+        if (!(status & UART_LSR_DR))
+                return NO_POLL_CHAR;
+
+        return serial_in(up, UART_RX);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+#ifdef CONFIG_SERIAL_OMAP_CONSOLE
+
+static struct uart_omap_port *serial_omap_console_ports[4];
+
+static struct uart_driver serial_omap_reg;
+
+static void serial_omap_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+        wait_for_xmitr(up);
+        serial_out(up, UART_TX, ch);
+}
+
+static void
+serial_omap_console_write(struct console *co, const char *s,
+                unsigned int count)
+{
+        struct uart_omap_port *up = serial_omap_console_ports[co->index];
+        unsigned long flags;
+        unsigned int ier;
+        int locked = 1;
+
+        local_irq_save(flags);
+        if (up->port.sysrq)
+                locked = 0;
+        else if (oops_in_progress)
+                locked = spin_trylock(&up->port.lock);
+        else
+                spin_lock(&up->port.lock);
+
+        /*
+         * First save the IER then disable the interrupts
+         */
+        ier = serial_in(up, UART_IER);
+        serial_out(up, UART_IER, 0);
+
+        uart_console_write(&up->port, s, count, serial_omap_console_putchar);
+
+        /*
+         * Finally, wait for transmitter to become empty
+         * and restore the IER
+         */
+        wait_for_xmitr(up);
+        serial_out(up, UART_IER, ier);
+        /*
+         * The receive handling will happen properly because the
+         * receive ready bit will still be set; it is not cleared
+         * on read.  However, modem control will not, we must
+         * call it if we have saved something in the saved flags
+         * while processing with interrupts off.
+         */
+        if (up->msr_saved_flags)
+                check_modem_status(up);
+
+        if (locked)
+                spin_unlock(&up->port.lock);
+        local_irq_restore(flags);
+}
+
+static int __init
+serial_omap_console_setup(struct console *co, char *options)
+{
+        struct uart_omap_port *up;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (serial_omap_console_ports[co->index] == NULL)
+                return -ENODEV;
+        up = serial_omap_console_ports[co->index];
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&up->port, co, baud, parity, bits, flow);
+}
+
+static struct console serial_omap_console = {
+        .name           = OMAP_SERIAL_NAME,
+        .write          = serial_omap_console_write,
+        .device         = uart_console_device,
+        .setup          = serial_omap_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &serial_omap_reg,
+};
+
+static void serial_omap_add_console_port(struct uart_omap_port *up)
+{
+        serial_omap_console_ports[up->pdev->id] = up;
+}
+
+#define OMAP_CONSOLE    (&serial_omap_console)
+
+#else
+
+#define OMAP_CONSOLE    NULL
+
+static inline void serial_omap_add_console_port(struct uart_omap_port *up)
+{}
+
+#endif
+
+static struct uart_ops serial_omap_pops = {
+        .tx_empty       = serial_omap_tx_empty,
+        .set_mctrl      = serial_omap_set_mctrl,
+        .get_mctrl      = serial_omap_get_mctrl,
+        .stop_tx        = serial_omap_stop_tx,
+        .start_tx       = serial_omap_start_tx,
+        .stop_rx        = serial_omap_stop_rx,
+        .enable_ms      = serial_omap_enable_ms,
+        .break_ctl      = serial_omap_break_ctl,
+        .startup        = serial_omap_startup,
+        .shutdown       = serial_omap_shutdown,
+        .set_termios    = serial_omap_set_termios,
+        .pm             = serial_omap_pm,
+        .type           = serial_omap_type,
+        .release_port   = serial_omap_release_port,
+        .request_port   = serial_omap_request_port,
+        .config_port    = serial_omap_config_port,
+        .verify_port    = serial_omap_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_put_char  = serial_omap_poll_put_char,
+        .poll_get_char  = serial_omap_poll_get_char,
+#endif
+};
+
+static struct uart_driver serial_omap_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "OMAP-SERIAL",
+        .dev_name       = OMAP_SERIAL_NAME,
+        .nr             = OMAP_MAX_HSUART_PORTS,
+        .cons           = OMAP_CONSOLE,
+};
+
+static int
+serial_omap_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct uart_omap_port *up = platform_get_drvdata(pdev);
+
+        if (up)
+                uart_suspend_port(&serial_omap_reg, &up->port);
+        return 0;
+}
+
+static int serial_omap_resume(struct platform_device *dev)
+{
+        struct uart_omap_port *up = platform_get_drvdata(dev);
+
+        if (up)
+                uart_resume_port(&serial_omap_reg, &up->port);
+        return 0;
+}
+
+static void serial_omap_rx_timeout(unsigned long uart_no)
+{
+        struct uart_omap_port *up = ui[uart_no];
+        unsigned int curr_dma_pos, curr_transmitted_size;
+        int ret = 0;
+
+        curr_dma_pos = omap_get_dma_dst_pos(up->uart_dma.rx_dma_channel);
+        if ((curr_dma_pos == up->uart_dma.prev_rx_dma_pos) ||
+                             (curr_dma_pos == 0)) {
+                if (jiffies_to_msecs(jiffies - up->port_activity) <
+                                                        RX_TIMEOUT) {
+                        mod_timer(&up->uart_dma.rx_timer, jiffies +
+                                usecs_to_jiffies(up->uart_dma.rx_timeout));
+                } else {
+                        serial_omap_stop_rxdma(up);
+                        up->ier |= (UART_IER_RDI | UART_IER_RLSI);
+                        serial_out(up, UART_IER, up->ier);
+                }
+                return;
+        }
+
+        curr_transmitted_size = curr_dma_pos -
+                                        up->uart_dma.prev_rx_dma_pos;
+        up->port.icount.rx += curr_transmitted_size;
+        tty_insert_flip_string(up->port.state->port.tty,
+                        up->uart_dma.rx_buf +
+                        (up->uart_dma.prev_rx_dma_pos -
+                        up->uart_dma.rx_buf_dma_phys),
+                        curr_transmitted_size);
+        tty_flip_buffer_push(up->port.state->port.tty);
+        up->uart_dma.prev_rx_dma_pos = curr_dma_pos;
+        if (up->uart_dma.rx_buf_size +
+                        up->uart_dma.rx_buf_dma_phys == curr_dma_pos) {
+                ret = serial_omap_start_rxdma(up);
+                if (ret < 0) {
+                        serial_omap_stop_rxdma(up);
+                        up->ier |= (UART_IER_RDI | UART_IER_RLSI);
+                        serial_out(up, UART_IER, up->ier);
+                }
+        } else  {
+                mod_timer(&up->uart_dma.rx_timer, jiffies +
+                        usecs_to_jiffies(up->uart_dma.rx_timeout));
+        }
+        up->port_activity = jiffies;
+}
+
+static void uart_rx_dma_callback(int lch, u16 ch_status, void *data)
+{
+        return;
+}
+
+static int serial_omap_start_rxdma(struct uart_omap_port *up)
+{
+        int ret = 0;
+
+        if (up->uart_dma.rx_dma_channel == -1) {
+                ret = omap_request_dma(up->uart_dma.uart_dma_rx,
+                                "UART Rx DMA",
+                                (void *)uart_rx_dma_callback, up,
+                                &(up->uart_dma.rx_dma_channel));
+                if (ret < 0)
+                        return ret;
+
+                omap_set_dma_src_params(up->uart_dma.rx_dma_channel, 0,
+                                OMAP_DMA_AMODE_CONSTANT,
+                                up->uart_dma.uart_base, 0, 0);
+                omap_set_dma_dest_params(up->uart_dma.rx_dma_channel, 0,
+                                OMAP_DMA_AMODE_POST_INC,
+                                up->uart_dma.rx_buf_dma_phys, 0, 0);
+                omap_set_dma_transfer_params(up->uart_dma.rx_dma_channel,
+                                OMAP_DMA_DATA_TYPE_S8,
+                                up->uart_dma.rx_buf_size, 1,
+                                OMAP_DMA_SYNC_ELEMENT,
+                                up->uart_dma.uart_dma_rx, 0);
+        }
+        up->uart_dma.prev_rx_dma_pos = up->uart_dma.rx_buf_dma_phys;
+        /* FIXME: Cache maintenance needed here? */
+        omap_start_dma(up->uart_dma.rx_dma_channel);
+        mod_timer(&up->uart_dma.rx_timer, jiffies +
+                                usecs_to_jiffies(up->uart_dma.rx_timeout));
+        up->uart_dma.rx_dma_used = true;
+        return ret;
+}
+
+static void serial_omap_continue_tx(struct uart_omap_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        unsigned int start = up->uart_dma.tx_buf_dma_phys
+                        + (xmit->tail & (UART_XMIT_SIZE - 1));
+
+        if (uart_circ_empty(xmit))
+                return;
+
+        up->uart_dma.tx_buf_size = uart_circ_chars_pending(xmit);
+        /*
+         * It is a circular buffer. See if the buffer has wounded back.
+         * If yes it will have to be transferred in two separate dma
+         * transfers
+         */
+        if (start + up->uart_dma.tx_buf_size >=
+                        up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE)
+                up->uart_dma.tx_buf_size =
+                        (up->uart_dma.tx_buf_dma_phys + UART_XMIT_SIZE) - start;
+        omap_set_dma_dest_params(up->uart_dma.tx_dma_channel, 0,
+                                OMAP_DMA_AMODE_CONSTANT,
+                                up->uart_dma.uart_base, 0, 0);
+        omap_set_dma_src_params(up->uart_dma.tx_dma_channel, 0,
+                                OMAP_DMA_AMODE_POST_INC, start, 0, 0);
+        omap_set_dma_transfer_params(up->uart_dma.tx_dma_channel,
+                                OMAP_DMA_DATA_TYPE_S8,
+                                up->uart_dma.tx_buf_size, 1,
+                                OMAP_DMA_SYNC_ELEMENT,
+                                up->uart_dma.uart_dma_tx, 0);
+        /* FIXME: Cache maintenance needed here? */
+        omap_start_dma(up->uart_dma.tx_dma_channel);
+}
+
+static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
+{
+        struct uart_omap_port *up = (struct uart_omap_port *)data;
+        struct circ_buf *xmit = &up->port.state->xmit;
+
+        xmit->tail = (xmit->tail + up->uart_dma.tx_buf_size) & \
+                        (UART_XMIT_SIZE - 1);
+        up->port.icount.tx += up->uart_dma.tx_buf_size;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        if (uart_circ_empty(xmit)) {
+                spin_lock(&(up->uart_dma.tx_lock));
+                serial_omap_stop_tx(&up->port);
+                up->uart_dma.tx_dma_used = false;
+                spin_unlock(&(up->uart_dma.tx_lock));
+        } else {
+                omap_stop_dma(up->uart_dma.tx_dma_channel);
+                serial_omap_continue_tx(up);
+        }
+        up->port_activity = jiffies;
+        return;
+}
+
+static int serial_omap_probe(struct platform_device *pdev)
+{
+        struct uart_omap_port   *up;
+        struct resource         *mem, *irq, *dma_tx, *dma_rx;
+        struct omap_uart_port_info *omap_up_info = pdev->dev.platform_data;
+        int ret = -ENOSPC;
+
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem) {
+                dev_err(&pdev->dev, "no mem resource?\n");
+                return -ENODEV;
+        }
+
+        irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!irq) {
+                dev_err(&pdev->dev, "no irq resource?\n");
+                return -ENODEV;
+        }
+
+        if (!request_mem_region(mem->start, (mem->end - mem->start) + 1,
+                                     pdev->dev.driver->name)) {
+                dev_err(&pdev->dev, "memory region already claimed\n");
+                return -EBUSY;
+        }
+
+        dma_rx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
+        if (!dma_rx) {
+                ret = -EINVAL;
+                goto err;
+        }
+
+        dma_tx = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
+        if (!dma_tx) {
+                ret = -EINVAL;
+                goto err;
+        }
+
+        up = kzalloc(sizeof(*up), GFP_KERNEL);
+        if (up == NULL) {
+                ret = -ENOMEM;
+                goto do_release_region;
+        }
+        sprintf(up->name, "OMAP UART%d", pdev->id);
+        up->pdev = pdev;
+        up->port.dev = &pdev->dev;
+        up->port.type = PORT_OMAP;
+        up->port.iotype = UPIO_MEM;
+        up->port.irq = irq->start;
+
+        up->port.regshift = 2;
+        up->port.fifosize = 64;
+        up->port.ops = &serial_omap_pops;
+        up->port.line = pdev->id;
+
+        up->port.membase = omap_up_info->membase;
+        up->port.mapbase = omap_up_info->mapbase;
+        up->port.flags = omap_up_info->flags;
+        up->port.irqflags = omap_up_info->irqflags;
+        up->port.uartclk = omap_up_info->uartclk;
+        up->uart_dma.uart_base = mem->start;
+
+        if (omap_up_info->dma_enabled) {
+                up->uart_dma.uart_dma_tx = dma_tx->start;
+                up->uart_dma.uart_dma_rx = dma_rx->start;
+                up->use_dma = 1;
+                up->uart_dma.rx_buf_size = 4096;
+                up->uart_dma.rx_timeout = 2;
+                spin_lock_init(&(up->uart_dma.tx_lock));
+                spin_lock_init(&(up->uart_dma.rx_lock));
+                up->uart_dma.tx_dma_channel = OMAP_UART_DMA_CH_FREE;
+                up->uart_dma.rx_dma_channel = OMAP_UART_DMA_CH_FREE;
+        }
+
+        ui[pdev->id] = up;
+        serial_omap_add_console_port(up);
+
+        ret = uart_add_one_port(&serial_omap_reg, &up->port);
+        if (ret != 0)
+                goto do_release_region;
+
+        platform_set_drvdata(pdev, up);
+        return 0;
+err:
+        dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
+                                pdev->id, __func__, ret);
+do_release_region:
+        release_mem_region(mem->start, (mem->end - mem->start) + 1);
+        return ret;
+}
+
+static int serial_omap_remove(struct platform_device *dev)
+{
+        struct uart_omap_port *up = platform_get_drvdata(dev);
+
+        platform_set_drvdata(dev, NULL);
+        if (up) {
+                uart_remove_one_port(&serial_omap_reg, &up->port);
+                kfree(up);
+        }
+        return 0;
+}
+
+static struct platform_driver serial_omap_driver = {
+        .probe          = serial_omap_probe,
+        .remove         = serial_omap_remove,
+
+        .suspend        = serial_omap_suspend,
+        .resume         = serial_omap_resume,
+        .driver         = {
+                .name   = DRIVER_NAME,
+        },
+};
+
+static int __init serial_omap_init(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&serial_omap_reg);
+        if (ret != 0)
+                return ret;
+        ret = platform_driver_register(&serial_omap_driver);
+        if (ret != 0)
+                uart_unregister_driver(&serial_omap_reg);
+        return ret;
+}
+
+static void __exit serial_omap_exit(void)
+{
+        platform_driver_unregister(&serial_omap_driver);
+        uart_unregister_driver(&serial_omap_reg);
+}
+
+module_init(serial_omap_init);
+module_exit(serial_omap_exit);
+
+MODULE_DESCRIPTION("OMAP High Speed UART driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Texas Instruments Inc");
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
new file mode 100644
index 000000000000..465210930890
--- /dev/null
+++ b/drivers/tty/serial/pch_uart.c
@@ -0,0 +1,1612 @@
+/*
+ *Copyright (C) 2010 OKI SEMICONDUCTOR CO., LTD.
+ *
+ *This program is free software; you can redistribute it and/or modify
+ *it under the terms of the GNU General Public License as published by
+ *the Free Software Foundation; version 2 of the License.
+ *
+ *This program is distributed in the hope that it will be useful,
+ *but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *GNU General Public License for more details.
+ *
+ *You should have received a copy of the GNU General Public License
+ *along with this program; if not, write to the Free Software
+ *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <linux/serial_reg.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/serial_core.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/dmi.h>
+
+#include <linux/dmaengine.h>
+#include <linux/pch_dma.h>
+
+enum {
+        PCH_UART_HANDLED_RX_INT_SHIFT,
+        PCH_UART_HANDLED_TX_INT_SHIFT,
+        PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
+        PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
+        PCH_UART_HANDLED_MS_INT_SHIFT,
+};
+
+enum {
+        PCH_UART_8LINE,
+        PCH_UART_2LINE,
+};
+
+#define PCH_UART_DRIVER_DEVICE "ttyPCH"
+
+/* Set the max number of UART port
+ * Intel EG20T PCH: 4 port
+ * OKI SEMICONDUCTOR ML7213 IOH: 3 port
+*/
+#define PCH_UART_NR     4
+
+#define PCH_UART_HANDLED_RX_INT (1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_TX_INT (1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_RX_ERR_INT     (1<<((\
+                                        PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_RX_TRG_INT     (1<<((\
+                                        PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
+#define PCH_UART_HANDLED_MS_INT (1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))
+
+#define PCH_UART_RBR            0x00
+#define PCH_UART_THR            0x00
+
+#define PCH_UART_IER_MASK       (PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
+                                PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
+#define PCH_UART_IER_ERBFI      0x00000001
+#define PCH_UART_IER_ETBEI      0x00000002
+#define PCH_UART_IER_ELSI       0x00000004
+#define PCH_UART_IER_EDSSI      0x00000008
+
+#define PCH_UART_IIR_IP                 0x00000001
+#define PCH_UART_IIR_IID                0x00000006
+#define PCH_UART_IIR_MSI                0x00000000
+#define PCH_UART_IIR_TRI                0x00000002
+#define PCH_UART_IIR_RRI                0x00000004
+#define PCH_UART_IIR_REI                0x00000006
+#define PCH_UART_IIR_TOI                0x00000008
+#define PCH_UART_IIR_FIFO256            0x00000020
+#define PCH_UART_IIR_FIFO64             PCH_UART_IIR_FIFO256
+#define PCH_UART_IIR_FE                 0x000000C0
+
+#define PCH_UART_FCR_FIFOE              0x00000001
+#define PCH_UART_FCR_RFR                0x00000002
+#define PCH_UART_FCR_TFR                0x00000004
+#define PCH_UART_FCR_DMS                0x00000008
+#define PCH_UART_FCR_FIFO256            0x00000020
+#define PCH_UART_FCR_RFTL               0x000000C0
+
+#define PCH_UART_FCR_RFTL1              0x00000000
+#define PCH_UART_FCR_RFTL64             0x00000040
+#define PCH_UART_FCR_RFTL128            0x00000080
+#define PCH_UART_FCR_RFTL224            0x000000C0
+#define PCH_UART_FCR_RFTL16             PCH_UART_FCR_RFTL64
+#define PCH_UART_FCR_RFTL32             PCH_UART_FCR_RFTL128
+#define PCH_UART_FCR_RFTL56             PCH_UART_FCR_RFTL224
+#define PCH_UART_FCR_RFTL4              PCH_UART_FCR_RFTL64
+#define PCH_UART_FCR_RFTL8              PCH_UART_FCR_RFTL128
+#define PCH_UART_FCR_RFTL14             PCH_UART_FCR_RFTL224
+#define PCH_UART_FCR_RFTL_SHIFT         6
+
+#define PCH_UART_LCR_WLS        0x00000003
+#define PCH_UART_LCR_STB        0x00000004
+#define PCH_UART_LCR_PEN        0x00000008
+#define PCH_UART_LCR_EPS        0x00000010
+#define PCH_UART_LCR_SP         0x00000020
+#define PCH_UART_LCR_SB         0x00000040
+#define PCH_UART_LCR_DLAB       0x00000080
+#define PCH_UART_LCR_NP         0x00000000
+#define PCH_UART_LCR_OP         PCH_UART_LCR_PEN
+#define PCH_UART_LCR_EP         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
+#define PCH_UART_LCR_1P         (PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
+#define PCH_UART_LCR_0P         (PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
+                                PCH_UART_LCR_SP)
+
+#define PCH_UART_LCR_5BIT       0x00000000
+#define PCH_UART_LCR_6BIT       0x00000001
+#define PCH_UART_LCR_7BIT       0x00000002
+#define PCH_UART_LCR_8BIT       0x00000003
+
+#define PCH_UART_MCR_DTR        0x00000001
+#define PCH_UART_MCR_RTS        0x00000002
+#define PCH_UART_MCR_OUT        0x0000000C
+#define PCH_UART_MCR_LOOP       0x00000010
+#define PCH_UART_MCR_AFE        0x00000020
+
+#define PCH_UART_LSR_DR         0x00000001
+#define PCH_UART_LSR_ERR        (1<<7)
+
+#define PCH_UART_MSR_DCTS       0x00000001
+#define PCH_UART_MSR_DDSR       0x00000002
+#define PCH_UART_MSR_TERI       0x00000004
+#define PCH_UART_MSR_DDCD       0x00000008
+#define PCH_UART_MSR_CTS        0x00000010
+#define PCH_UART_MSR_DSR        0x00000020
+#define PCH_UART_MSR_RI         0x00000040
+#define PCH_UART_MSR_DCD        0x00000080
+#define PCH_UART_MSR_DELTA      (PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
+                                PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)
+
+#define PCH_UART_DLL            0x00
+#define PCH_UART_DLM            0x01
+
+#define DIV_ROUND(a, b) (((a) + ((b)/2)) / (b))
+
+#define PCH_UART_IID_RLS        (PCH_UART_IIR_REI)
+#define PCH_UART_IID_RDR        (PCH_UART_IIR_RRI)
+#define PCH_UART_IID_RDR_TO     (PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
+#define PCH_UART_IID_THRE       (PCH_UART_IIR_TRI)
+#define PCH_UART_IID_MS         (PCH_UART_IIR_MSI)
+
+#define PCH_UART_HAL_PARITY_NONE        (PCH_UART_LCR_NP)
+#define PCH_UART_HAL_PARITY_ODD         (PCH_UART_LCR_OP)
+#define PCH_UART_HAL_PARITY_EVEN        (PCH_UART_LCR_EP)
+#define PCH_UART_HAL_PARITY_FIX1        (PCH_UART_LCR_1P)
+#define PCH_UART_HAL_PARITY_FIX0        (PCH_UART_LCR_0P)
+#define PCH_UART_HAL_5BIT               (PCH_UART_LCR_5BIT)
+#define PCH_UART_HAL_6BIT               (PCH_UART_LCR_6BIT)
+#define PCH_UART_HAL_7BIT               (PCH_UART_LCR_7BIT)
+#define PCH_UART_HAL_8BIT               (PCH_UART_LCR_8BIT)
+#define PCH_UART_HAL_STB1               0
+#define PCH_UART_HAL_STB2               (PCH_UART_LCR_STB)
+
+#define PCH_UART_HAL_CLR_TX_FIFO        (PCH_UART_FCR_TFR)
+#define PCH_UART_HAL_CLR_RX_FIFO        (PCH_UART_FCR_RFR)
+#define PCH_UART_HAL_CLR_ALL_FIFO       (PCH_UART_HAL_CLR_TX_FIFO | \
+                                        PCH_UART_HAL_CLR_RX_FIFO)
+
+#define PCH_UART_HAL_DMA_MODE0          0
+#define PCH_UART_HAL_FIFO_DIS           0
+#define PCH_UART_HAL_FIFO16             (PCH_UART_FCR_FIFOE)
+#define PCH_UART_HAL_FIFO256            (PCH_UART_FCR_FIFOE | \
+                                        PCH_UART_FCR_FIFO256)
+#define PCH_UART_HAL_FIFO64             (PCH_UART_HAL_FIFO256)
+#define PCH_UART_HAL_TRIGGER1           (PCH_UART_FCR_RFTL1)
+#define PCH_UART_HAL_TRIGGER64          (PCH_UART_FCR_RFTL64)
+#define PCH_UART_HAL_TRIGGER128         (PCH_UART_FCR_RFTL128)
+#define PCH_UART_HAL_TRIGGER224         (PCH_UART_FCR_RFTL224)
+#define PCH_UART_HAL_TRIGGER16          (PCH_UART_FCR_RFTL16)
+#define PCH_UART_HAL_TRIGGER32          (PCH_UART_FCR_RFTL32)
+#define PCH_UART_HAL_TRIGGER56          (PCH_UART_FCR_RFTL56)
+#define PCH_UART_HAL_TRIGGER4           (PCH_UART_FCR_RFTL4)
+#define PCH_UART_HAL_TRIGGER8           (PCH_UART_FCR_RFTL8)
+#define PCH_UART_HAL_TRIGGER14          (PCH_UART_FCR_RFTL14)
+#define PCH_UART_HAL_TRIGGER_L          (PCH_UART_FCR_RFTL64)
+#define PCH_UART_HAL_TRIGGER_M          (PCH_UART_FCR_RFTL128)
+#define PCH_UART_HAL_TRIGGER_H          (PCH_UART_FCR_RFTL224)
+
+#define PCH_UART_HAL_RX_INT             (PCH_UART_IER_ERBFI)
+#define PCH_UART_HAL_TX_INT             (PCH_UART_IER_ETBEI)
+#define PCH_UART_HAL_RX_ERR_INT         (PCH_UART_IER_ELSI)
+#define PCH_UART_HAL_MS_INT             (PCH_UART_IER_EDSSI)
+#define PCH_UART_HAL_ALL_INT            (PCH_UART_IER_MASK)
+
+#define PCH_UART_HAL_DTR                (PCH_UART_MCR_DTR)
+#define PCH_UART_HAL_RTS                (PCH_UART_MCR_RTS)
+#define PCH_UART_HAL_OUT                (PCH_UART_MCR_OUT)
+#define PCH_UART_HAL_LOOP               (PCH_UART_MCR_LOOP)
+#define PCH_UART_HAL_AFE                (PCH_UART_MCR_AFE)
+
+#define PCI_VENDOR_ID_ROHM              0x10DB
+
+struct pch_uart_buffer {
+        unsigned char *buf;
+        int size;
+};
+
+struct eg20t_port {
+        struct uart_port port;
+        int port_type;
+        void __iomem *membase;
+        resource_size_t mapbase;
+        unsigned int iobase;
+        struct pci_dev *pdev;
+        int fifo_size;
+        int base_baud;
+        int start_tx;
+        int start_rx;
+        int tx_empty;
+        int int_dis_flag;
+        int trigger;
+        int trigger_level;
+        struct pch_uart_buffer rxbuf;
+        unsigned int dmsr;
+        unsigned int fcr;
+        unsigned int mcr;
+        unsigned int use_dma;
+        unsigned int use_dma_flag;
+        struct dma_async_tx_descriptor  *desc_tx;
+        struct dma_async_tx_descriptor  *desc_rx;
+        struct pch_dma_slave            param_tx;
+        struct pch_dma_slave            param_rx;
+        struct dma_chan                 *chan_tx;
+        struct dma_chan                 *chan_rx;
+        struct scatterlist              *sg_tx_p;
+        int                             nent;
+        struct scatterlist              sg_rx;
+        int                             tx_dma_use;
+        void                            *rx_buf_virt;
+        dma_addr_t                      rx_buf_dma;
+};
+
+/**
+ * struct pch_uart_driver_data - private data structure for UART-DMA
+ * @port_type:                  The number of DMA channel
+ * @line_no:                    UART port line number (0, 1, 2...)
+ */
+struct pch_uart_driver_data {
+        int port_type;
+        int line_no;
+};
+
+enum pch_uart_num_t {
+        pch_et20t_uart0 = 0,
+        pch_et20t_uart1,
+        pch_et20t_uart2,
+        pch_et20t_uart3,
+        pch_ml7213_uart0,
+        pch_ml7213_uart1,
+        pch_ml7213_uart2,
+        pch_ml7223_uart0,
+        pch_ml7223_uart1,
+};
+
+static struct pch_uart_driver_data drv_dat[] = {
+        [pch_et20t_uart0] = {PCH_UART_8LINE, 0},
+        [pch_et20t_uart1] = {PCH_UART_2LINE, 1},
+        [pch_et20t_uart2] = {PCH_UART_2LINE, 2},
+        [pch_et20t_uart3] = {PCH_UART_2LINE, 3},
+        [pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
+        [pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
+        [pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
+        [pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
+        [pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
+};
+
+static unsigned int default_baud = 9600;
+static const int trigger_level_256[4] = { 1, 64, 128, 224 };
+static const int trigger_level_64[4] = { 1, 16, 32, 56 };
+static const int trigger_level_16[4] = { 1, 4, 8, 14 };
+static const int trigger_level_1[4] = { 1, 1, 1, 1 };
+
+static void pch_uart_hal_request(struct pci_dev *pdev, int fifosize,
+                                 int base_baud)
+{
+        struct eg20t_port *priv = pci_get_drvdata(pdev);
+
+        priv->trigger_level = 1;
+        priv->fcr = 0;
+}
+
+static unsigned int get_msr(struct eg20t_port *priv, void __iomem *base)
+{
+        unsigned int msr = ioread8(base + UART_MSR);
+        priv->dmsr |= msr & PCH_UART_MSR_DELTA;
+
+        return msr;
+}
+
+static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
+                                          unsigned int flag)
+{
+        u8 ier = ioread8(priv->membase + UART_IER);
+        ier |= flag & PCH_UART_IER_MASK;
+        iowrite8(ier, priv->membase + UART_IER);
+}
+
+static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
+                                           unsigned int flag)
+{
+        u8 ier = ioread8(priv->membase + UART_IER);
+        ier &= ~(flag & PCH_UART_IER_MASK);
+        iowrite8(ier, priv->membase + UART_IER);
+}
+
+static int pch_uart_hal_set_line(struct eg20t_port *priv, int baud,
+                                 unsigned int parity, unsigned int bits,
+                                 unsigned int stb)
+{
+        unsigned int dll, dlm, lcr;
+        int div;
+
+        div = DIV_ROUND(priv->base_baud / 16, baud);
+        if (div < 0 || USHRT_MAX <= div) {
+                dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
+                return -EINVAL;
+        }
+
+        dll = (unsigned int)div & 0x00FFU;
+        dlm = ((unsigned int)div >> 8) & 0x00FFU;
+
+        if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
+                dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
+                return -EINVAL;
+        }
+
+        if (bits & ~PCH_UART_LCR_WLS) {
+                dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
+                return -EINVAL;
+        }
+
+        if (stb & ~PCH_UART_LCR_STB) {
+                dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
+                return -EINVAL;
+        }
+
+        lcr = parity;
+        lcr |= bits;
+        lcr |= stb;
+
+        dev_dbg(priv->port.dev, "%s:baud = %d, div = %04x, lcr = %02x (%lu)\n",
+                 __func__, baud, div, lcr, jiffies);
+        iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
+        iowrite8(dll, priv->membase + PCH_UART_DLL);
+        iowrite8(dlm, priv->membase + PCH_UART_DLM);
+        iowrite8(lcr, priv->membase + UART_LCR);
+
+        return 0;
+}
+
+static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
+                                    unsigned int flag)
+{
+        if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
+                dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
+                        __func__, flag);
+                return -EINVAL;
+        }
+
+        iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
+        iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
+                 priv->membase + UART_FCR);
+        iowrite8(priv->fcr, priv->membase + UART_FCR);
+
+        return 0;
+}
+
+static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
+                                 unsigned int dmamode,
+                                 unsigned int fifo_size, unsigned int trigger)
+{
+        u8 fcr;
+
+        if (dmamode & ~PCH_UART_FCR_DMS) {
+                dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
+                        __func__, dmamode);
+                return -EINVAL;
+        }
+
+        if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
+                dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
+                        __func__, fifo_size);
+                return -EINVAL;
+        }
+
+        if (trigger & ~PCH_UART_FCR_RFTL) {
+                dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
+                        __func__, trigger);
+                return -EINVAL;
+        }
+
+        switch (priv->fifo_size) {
+        case 256:
+                priv->trigger_level =
+                    trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+                break;
+        case 64:
+                priv->trigger_level =
+                    trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+                break;
+        case 16:
+                priv->trigger_level =
+                    trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+                break;
+        default:
+                priv->trigger_level =
+                    trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
+                break;
+        }
+        fcr =
+            dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
+        iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
+        iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
+                 priv->membase + UART_FCR);
+        iowrite8(fcr, priv->membase + UART_FCR);
+        priv->fcr = fcr;
+
+        return 0;
+}
+
+static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
+{
+        priv->dmsr = 0;
+        return get_msr(priv, priv->membase);
+}
+
+static void pch_uart_hal_write(struct eg20t_port *priv,
+                              const unsigned char *buf, int tx_size)
+{
+        int i;
+        unsigned int thr;
+
+        for (i = 0; i < tx_size;) {
+                thr = buf[i++];
+                iowrite8(thr, priv->membase + PCH_UART_THR);
+        }
+}
+
+static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
+                             int rx_size)
+{
+        int i;
+        u8 rbr, lsr;
+
+        lsr = ioread8(priv->membase + UART_LSR);
+        for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
+             i < rx_size && lsr & UART_LSR_DR;
+             lsr = ioread8(priv->membase + UART_LSR)) {
+                rbr = ioread8(priv->membase + PCH_UART_RBR);
+                buf[i++] = rbr;
+        }
+        return i;
+}
+
+static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv)
+{
+        unsigned int iir;
+        int ret;
+
+        iir = ioread8(priv->membase + UART_IIR);
+        ret = (iir & (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP));
+        return ret;
+}
+
+static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
+{
+        return ioread8(priv->membase + UART_LSR);
+}
+
+static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
+{
+        unsigned int lcr;
+
+        lcr = ioread8(priv->membase + UART_LCR);
+        if (on)
+                lcr |= PCH_UART_LCR_SB;
+        else
+                lcr &= ~PCH_UART_LCR_SB;
+
+        iowrite8(lcr, priv->membase + UART_LCR);
+}
+
+static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
+                   int size)
+{
+        struct uart_port *port;
+        struct tty_struct *tty;
+
+        port = &priv->port;
+        tty = tty_port_tty_get(&port->state->port);
+        if (!tty) {
+                dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
+                return -EBUSY;
+        }
+
+        tty_insert_flip_string(tty, buf, size);
+        tty_flip_buffer_push(tty);
+        tty_kref_put(tty);
+
+        return 0;
+}
+
+static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
+{
+        int ret;
+        struct uart_port *port = &priv->port;
+
+        if (port->x_char) {
+                dev_dbg(priv->port.dev, "%s:X character send %02x (%lu)\n",
+                        __func__, port->x_char, jiffies);
+                buf[0] = port->x_char;
+                port->x_char = 0;
+                ret = 1;
+        } else {
+                ret = 0;
+        }
+
+        return ret;
+}
+
+static int dma_push_rx(struct eg20t_port *priv, int size)
+{
+        struct tty_struct *tty;
+        int room;
+        struct uart_port *port = &priv->port;
+
+        port = &priv->port;
+        tty = tty_port_tty_get(&port->state->port);
+        if (!tty) {
+                dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
+                return 0;
+        }
+
+        room = tty_buffer_request_room(tty, size);
+
+        if (room < size)
+                dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
+                         size - room);
+        if (!room)
+                return room;
+
+        tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size);
+
+        port->icount.rx += room;
+        tty_kref_put(tty);
+
+        return room;
+}
+
+static void pch_free_dma(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        priv = container_of(port, struct eg20t_port, port);
+
+        if (priv->chan_tx) {
+                dma_release_channel(priv->chan_tx);
+                priv->chan_tx = NULL;
+        }
+        if (priv->chan_rx) {
+                dma_release_channel(priv->chan_rx);
+                priv->chan_rx = NULL;
+        }
+        if (sg_dma_address(&priv->sg_rx))
+                dma_free_coherent(port->dev, port->fifosize,
+                                  sg_virt(&priv->sg_rx),
+                                  sg_dma_address(&priv->sg_rx));
+
+        return;
+}
+
+static bool filter(struct dma_chan *chan, void *slave)
+{
+        struct pch_dma_slave *param = slave;
+
+        if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
+                                                  chan->device->dev)) {
+                chan->private = param;
+                return true;
+        } else {
+                return false;
+        }
+}
+
+static void pch_request_dma(struct uart_port *port)
+{
+        dma_cap_mask_t mask;
+        struct dma_chan *chan;
+        struct pci_dev *dma_dev;
+        struct pch_dma_slave *param;
+        struct eg20t_port *priv =
+                                container_of(port, struct eg20t_port, port);
+        dma_cap_zero(mask);
+        dma_cap_set(DMA_SLAVE, mask);
+
+        dma_dev = pci_get_bus_and_slot(2, PCI_DEVFN(0xa, 0)); /* Get DMA's dev
+                                                                information */
+        /* Set Tx DMA */
+        param = &priv->param_tx;
+        param->dma_dev = &dma_dev->dev;
+        param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */
+
+        param->tx_reg = port->mapbase + UART_TX;
+        chan = dma_request_channel(mask, filter, param);
+        if (!chan) {
+                dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
+                        __func__);
+                return;
+        }
+        priv->chan_tx = chan;
+
+        /* Set Rx DMA */
+        param = &priv->param_rx;
+        param->dma_dev = &dma_dev->dev;
+        param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */
+
+        param->rx_reg = port->mapbase + UART_RX;
+        chan = dma_request_channel(mask, filter, param);
+        if (!chan) {
+                dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
+                        __func__);
+                dma_release_channel(priv->chan_tx);
+                return;
+        }
+
+        /* Get Consistent memory for DMA */
+        priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
+                                    &priv->rx_buf_dma, GFP_KERNEL);
+        priv->chan_rx = chan;
+}
+
+static void pch_dma_rx_complete(void *arg)
+{
+        struct eg20t_port *priv = arg;
+        struct uart_port *port = &priv->port;
+        struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+        int count;
+
+        if (!tty) {
+                dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
+                return;
+        }
+
+        dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
+        count = dma_push_rx(priv, priv->trigger_level);
+        if (count)
+                tty_flip_buffer_push(tty);
+        tty_kref_put(tty);
+        async_tx_ack(priv->desc_rx);
+        pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
+}
+
+static void pch_dma_tx_complete(void *arg)
+{
+        struct eg20t_port *priv = arg;
+        struct uart_port *port = &priv->port;
+        struct circ_buf *xmit = &port->state->xmit;
+        struct scatterlist *sg = priv->sg_tx_p;
+        int i;
+
+        for (i = 0; i < priv->nent; i++, sg++) {
+                xmit->tail += sg_dma_len(sg);
+                port->icount.tx += sg_dma_len(sg);
+        }
+        xmit->tail &= UART_XMIT_SIZE - 1;
+        async_tx_ack(priv->desc_tx);
+        dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
+        priv->tx_dma_use = 0;
+        priv->nent = 0;
+        kfree(priv->sg_tx_p);
+        pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
+}
+
+static int pop_tx(struct eg20t_port *priv, int size)
+{
+        int count = 0;
+        struct uart_port *port = &priv->port;
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
+                goto pop_tx_end;
+
+        do {
+                int cnt_to_end =
+                    CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+                int sz = min(size - count, cnt_to_end);
+                pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
+                xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
+                count += sz;
+        } while (!uart_circ_empty(xmit) && count < size);
+
+pop_tx_end:
+        dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
+                 count, size - count, jiffies);
+
+        return count;
+}
+
+static int handle_rx_to(struct eg20t_port *priv)
+{
+        struct pch_uart_buffer *buf;
+        int rx_size;
+        int ret;
+        if (!priv->start_rx) {
+                pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
+                return 0;
+        }
+        buf = &priv->rxbuf;
+        do {
+                rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
+                ret = push_rx(priv, buf->buf, rx_size);
+                if (ret)
+                        return 0;
+        } while (rx_size == buf->size);
+
+        return PCH_UART_HANDLED_RX_INT;
+}
+
+static int handle_rx(struct eg20t_port *priv)
+{
+        return handle_rx_to(priv);
+}
+
+static int dma_handle_rx(struct eg20t_port *priv)
+{
+        struct uart_port *port = &priv->port;
+        struct dma_async_tx_descriptor *desc;
+        struct scatterlist *sg;
+
+        priv = container_of(port, struct eg20t_port, port);
+        sg = &priv->sg_rx;
+
+        sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */
+
+        sg_dma_len(sg) = priv->trigger_level;
+
+        sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
+                     sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
+                     ~PAGE_MASK);
+
+        sg_dma_address(sg) = priv->rx_buf_dma;
+
+        desc = priv->chan_rx->device->device_prep_slave_sg(priv->chan_rx,
+                        sg, 1, DMA_FROM_DEVICE,
+                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+
+        if (!desc)
+                return 0;
+
+        priv->desc_rx = desc;
+        desc->callback = pch_dma_rx_complete;
+        desc->callback_param = priv;
+        desc->tx_submit(desc);
+        dma_async_issue_pending(priv->chan_rx);
+
+        return PCH_UART_HANDLED_RX_INT;
+}
+
+static unsigned int handle_tx(struct eg20t_port *priv)
+{
+        struct uart_port *port = &priv->port;
+        struct circ_buf *xmit = &port->state->xmit;
+        int fifo_size;
+        int tx_size;
+        int size;
+        int tx_empty;
+
+        if (!priv->start_tx) {
+                dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
+                        __func__, jiffies);
+                pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+                priv->tx_empty = 1;
+                return 0;
+        }
+
+        fifo_size = max(priv->fifo_size, 1);
+        tx_empty = 1;
+        if (pop_tx_x(priv, xmit->buf)) {
+                pch_uart_hal_write(priv, xmit->buf, 1);
+                port->icount.tx++;
+                tx_empty = 0;
+                fifo_size--;
+        }
+        size = min(xmit->head - xmit->tail, fifo_size);
+        if (size < 0)
+                size = fifo_size;
+
+        tx_size = pop_tx(priv, size);
+        if (tx_size > 0) {
+                port->icount.tx += tx_size;
+                tx_empty = 0;
+        }
+
+        priv->tx_empty = tx_empty;
+
+        if (tx_empty) {
+                pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+                uart_write_wakeup(port);
+        }
+
+        return PCH_UART_HANDLED_TX_INT;
+}
+
+static unsigned int dma_handle_tx(struct eg20t_port *priv)
+{
+        struct uart_port *port = &priv->port;
+        struct circ_buf *xmit = &port->state->xmit;
+        struct scatterlist *sg;
+        int nent;
+        int fifo_size;
+        int tx_empty;
+        struct dma_async_tx_descriptor *desc;
+        int num;
+        int i;
+        int bytes;
+        int size;
+        int rem;
+
+        if (!priv->start_tx) {
+                dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
+                        __func__, jiffies);
+                pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+                priv->tx_empty = 1;
+                return 0;
+        }
+
+        if (priv->tx_dma_use) {
+                dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
+                        __func__, jiffies);
+                pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+                priv->tx_empty = 1;
+                return 0;
+        }
+
+        fifo_size = max(priv->fifo_size, 1);
+        tx_empty = 1;
+        if (pop_tx_x(priv, xmit->buf)) {
+                pch_uart_hal_write(priv, xmit->buf, 1);
+                port->icount.tx++;
+                tx_empty = 0;
+                fifo_size--;
+        }
+
+        bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
+                             UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
+                             xmit->tail, UART_XMIT_SIZE));
+        if (!bytes) {
+                dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
+                pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
+                uart_write_wakeup(port);
+                return 0;
+        }
+
+        if (bytes > fifo_size) {
+                num = bytes / fifo_size + 1;
+                size = fifo_size;
+                rem = bytes % fifo_size;
+        } else {
+                num = 1;
+                size = bytes;
+                rem = bytes;
+        }
+
+        dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
+                __func__, num, size, rem);
+
+        priv->tx_dma_use = 1;
+
+        priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
+
+        sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
+        sg = priv->sg_tx_p;
+
+        for (i = 0; i < num; i++, sg++) {
+                if (i == (num - 1))
+                        sg_set_page(sg, virt_to_page(xmit->buf),
+                                    rem, fifo_size * i);
+                else
+                        sg_set_page(sg, virt_to_page(xmit->buf),
+                                    size, fifo_size * i);
+        }
+
+        sg = priv->sg_tx_p;
+        nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
+        if (!nent) {
+                dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
+                return 0;
+        }
+        priv->nent = nent;
+
+        for (i = 0; i < nent; i++, sg++) {
+                sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
+                              fifo_size * i;
+                sg_dma_address(sg) = (sg_dma_address(sg) &
+                                    ~(UART_XMIT_SIZE - 1)) + sg->offset;
+                if (i == (nent - 1))
+                        sg_dma_len(sg) = rem;
+                else
+                        sg_dma_len(sg) = size;
+        }
+
+        desc = priv->chan_tx->device->device_prep_slave_sg(priv->chan_tx,
+                                        priv->sg_tx_p, nent, DMA_TO_DEVICE,
+                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+        if (!desc) {
+                dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
+                        __func__);
+                return 0;
+        }
+        dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
+        priv->desc_tx = desc;
+        desc->callback = pch_dma_tx_complete;
+        desc->callback_param = priv;
+
+        desc->tx_submit(desc);
+
+        dma_async_issue_pending(priv->chan_tx);
+
+        return PCH_UART_HANDLED_TX_INT;
+}
+
+static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
+{
+        u8 fcr = ioread8(priv->membase + UART_FCR);
+
+        /* Reset FIFO */
+        fcr |= UART_FCR_CLEAR_RCVR;
+        iowrite8(fcr, priv->membase + UART_FCR);
+
+        if (lsr & PCH_UART_LSR_ERR)
+                dev_err(&priv->pdev->dev, "Error data in FIFO\n");
+
+        if (lsr & UART_LSR_FE)
+                dev_err(&priv->pdev->dev, "Framing Error\n");
+
+        if (lsr & UART_LSR_PE)
+                dev_err(&priv->pdev->dev, "Parity Error\n");
+
+        if (lsr & UART_LSR_OE)
+                dev_err(&priv->pdev->dev, "Overrun Error\n");
+}
+
+static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
+{
+        struct eg20t_port *priv = dev_id;
+        unsigned int handled;
+        u8 lsr;
+        int ret = 0;
+        unsigned int iid;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->port.lock, flags);
+        handled = 0;
+        while ((iid = pch_uart_hal_get_iid(priv)) > 1) {
+                switch (iid) {
+                case PCH_UART_IID_RLS:  /* Receiver Line Status */
+                        lsr = pch_uart_hal_get_line_status(priv);
+                        if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
+                                                UART_LSR_PE | UART_LSR_OE)) {
+                                pch_uart_err_ir(priv, lsr);
+                                ret = PCH_UART_HANDLED_RX_ERR_INT;
+                        }
+                        break;
+                case PCH_UART_IID_RDR:  /* Received Data Ready */
+                        if (priv->use_dma) {
+                                pch_uart_hal_disable_interrupt(priv,
+                                                        PCH_UART_HAL_RX_INT);
+                                ret = dma_handle_rx(priv);
+                                if (!ret)
+                                        pch_uart_hal_enable_interrupt(priv,
+                                                        PCH_UART_HAL_RX_INT);
+                        } else {
+                                ret = handle_rx(priv);
+                        }
+                        break;
+                case PCH_UART_IID_RDR_TO:       /* Received Data Ready
+                                                   (FIFO Timeout) */
+                        ret = handle_rx_to(priv);
+                        break;
+                case PCH_UART_IID_THRE: /* Transmitter Holding Register
+                                                   Empty */
+                        if (priv->use_dma)
+                                ret = dma_handle_tx(priv);
+                        else
+                                ret = handle_tx(priv);
+                        break;
+                case PCH_UART_IID_MS:   /* Modem Status */
+                        ret = PCH_UART_HANDLED_MS_INT;
+                        break;
+                default:        /* Never junp to this label */
+                        dev_err(priv->port.dev, "%s:iid=%d (%lu)\n", __func__,
+                                iid, jiffies);
+                        ret = -1;
+                        break;
+                }
+                handled |= (unsigned int)ret;
+        }
+        if (handled == 0 && iid <= 1) {
+                if (priv->int_dis_flag)
+                        priv->int_dis_flag = 0;
+        }
+
+        spin_unlock_irqrestore(&priv->port.lock, flags);
+        return IRQ_RETVAL(handled);
+}
+
+/* This function tests whether the transmitter fifo and shifter for the port
+                                                described by 'port' is empty. */
+static unsigned int pch_uart_tx_empty(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        int ret;
+        priv = container_of(port, struct eg20t_port, port);
+        if (priv->tx_empty)
+                ret = TIOCSER_TEMT;
+        else
+                ret = 0;
+
+        return ret;
+}
+
+/* Returns the current state of modem control inputs. */
+static unsigned int pch_uart_get_mctrl(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        u8 modem;
+        unsigned int ret = 0;
+
+        priv = container_of(port, struct eg20t_port, port);
+        modem = pch_uart_hal_get_modem(priv);
+
+        if (modem & UART_MSR_DCD)
+                ret |= TIOCM_CAR;
+
+        if (modem & UART_MSR_RI)
+                ret |= TIOCM_RNG;
+
+        if (modem & UART_MSR_DSR)
+                ret |= TIOCM_DSR;
+
+        if (modem & UART_MSR_CTS)
+                ret |= TIOCM_CTS;
+
+        return ret;
+}
+
+static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        u32 mcr = 0;
+        struct eg20t_port *priv = container_of(port, struct eg20t_port, port);
+
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        if (priv->mcr & UART_MCR_AFE)
+                mcr |= UART_MCR_AFE;
+
+        if (mctrl)
+                iowrite8(mcr, priv->membase + UART_MCR);
+}
+
+static void pch_uart_stop_tx(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        priv = container_of(port, struct eg20t_port, port);
+        priv->start_tx = 0;
+        priv->tx_dma_use = 0;
+}
+
+static void pch_uart_start_tx(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+
+        priv = container_of(port, struct eg20t_port, port);
+
+        if (priv->use_dma) {
+                if (priv->tx_dma_use) {
+                        dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
+                                __func__);
+                        return;
+                }
+        }
+
+        priv->start_tx = 1;
+        pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
+}
+
+static void pch_uart_stop_rx(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        priv = container_of(port, struct eg20t_port, port);
+        priv->start_rx = 0;
+        pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT);
+        priv->int_dis_flag = 1;
+}
+
+/* Enable the modem status interrupts. */
+static void pch_uart_enable_ms(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        priv = container_of(port, struct eg20t_port, port);
+        pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
+}
+
+/* Control the transmission of a break signal. */
+static void pch_uart_break_ctl(struct uart_port *port, int ctl)
+{
+        struct eg20t_port *priv;
+        unsigned long flags;
+
+        priv = container_of(port, struct eg20t_port, port);
+        spin_lock_irqsave(&port->lock, flags);
+        pch_uart_hal_set_break(priv, ctl);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/* Grab any interrupt resources and initialise any low level driver state. */
+static int pch_uart_startup(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        int ret;
+        int fifo_size;
+        int trigger_level;
+
+        priv = container_of(port, struct eg20t_port, port);
+        priv->tx_empty = 1;
+
+        if (port->uartclk)
+                priv->base_baud = port->uartclk;
+        else
+                port->uartclk = priv->base_baud;
+
+        pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
+        ret = pch_uart_hal_set_line(priv, default_baud,
+                              PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
+                              PCH_UART_HAL_STB1);
+        if (ret)
+                return ret;
+
+        switch (priv->fifo_size) {
+        case 256:
+                fifo_size = PCH_UART_HAL_FIFO256;
+                break;
+        case 64:
+                fifo_size = PCH_UART_HAL_FIFO64;
+                break;
+        case 16:
+                fifo_size = PCH_UART_HAL_FIFO16;
+        case 1:
+        default:
+                fifo_size = PCH_UART_HAL_FIFO_DIS;
+                break;
+        }
+
+        switch (priv->trigger) {
+        case PCH_UART_HAL_TRIGGER1:
+                trigger_level = 1;
+                break;
+        case PCH_UART_HAL_TRIGGER_L:
+                trigger_level = priv->fifo_size / 4;
+                break;
+        case PCH_UART_HAL_TRIGGER_M:
+                trigger_level = priv->fifo_size / 2;
+                break;
+        case PCH_UART_HAL_TRIGGER_H:
+        default:
+                trigger_level = priv->fifo_size - (priv->fifo_size / 8);
+                break;
+        }
+
+        priv->trigger_level = trigger_level;
+        ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
+                                    fifo_size, priv->trigger);
+        if (ret < 0)
+                return ret;
+
+        ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
+                        KBUILD_MODNAME, priv);
+        if (ret < 0)
+                return ret;
+
+        if (priv->use_dma)
+                pch_request_dma(port);
+
+        priv->start_rx = 1;
+        pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT);
+        uart_update_timeout(port, CS8, default_baud);
+
+        return 0;
+}
+
+static void pch_uart_shutdown(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        int ret;
+
+        priv = container_of(port, struct eg20t_port, port);
+        pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
+        pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
+        ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
+                              PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
+        if (ret)
+                dev_err(priv->port.dev,
+                        "pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);
+
+        if (priv->use_dma_flag)
+                pch_free_dma(port);
+
+        free_irq(priv->port.irq, priv);
+}
+
+/* Change the port parameters, including word length, parity, stop
+ *bits.  Update read_status_mask and ignore_status_mask to indicate
+ *the types of events we are interested in receiving.  */
+static void pch_uart_set_termios(struct uart_port *port,
+                                 struct ktermios *termios, struct ktermios *old)
+{
+        int baud;
+        int rtn;
+        unsigned int parity, bits, stb;
+        struct eg20t_port *priv;
+        unsigned long flags;
+
+        priv = container_of(port, struct eg20t_port, port);
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                bits = PCH_UART_HAL_5BIT;
+                break;
+        case CS6:
+                bits = PCH_UART_HAL_6BIT;
+                break;
+        case CS7:
+                bits = PCH_UART_HAL_7BIT;
+                break;
+        default:                /* CS8 */
+                bits = PCH_UART_HAL_8BIT;
+                break;
+        }
+        if (termios->c_cflag & CSTOPB)
+                stb = PCH_UART_HAL_STB2;
+        else
+                stb = PCH_UART_HAL_STB1;
+
+        if (termios->c_cflag & PARENB) {
+                if (!(termios->c_cflag & PARODD))
+                        parity = PCH_UART_HAL_PARITY_ODD;
+                else
+                        parity = PCH_UART_HAL_PARITY_EVEN;
+
+        } else {
+                parity = PCH_UART_HAL_PARITY_NONE;
+        }
+
+        /* Only UART0 has auto hardware flow function */
+        if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
+                priv->mcr |= UART_MCR_AFE;
+        else
+                priv->mcr &= ~UART_MCR_AFE;
+
+        termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+        rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
+        if (rtn)
+                goto out;
+
+        /* Don't rewrite B0 */
+        if (tty_termios_baud_rate(termios))
+                tty_termios_encode_baud_rate(termios, baud, baud);
+
+out:
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *pch_uart_type(struct uart_port *port)
+{
+        return KBUILD_MODNAME;
+}
+
+static void pch_uart_release_port(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+
+        priv = container_of(port, struct eg20t_port, port);
+        pci_iounmap(priv->pdev, priv->membase);
+        pci_release_regions(priv->pdev);
+}
+
+static int pch_uart_request_port(struct uart_port *port)
+{
+        struct eg20t_port *priv;
+        int ret;
+        void __iomem *membase;
+
+        priv = container_of(port, struct eg20t_port, port);
+        ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
+        if (ret < 0)
+                return -EBUSY;
+
+        membase = pci_iomap(priv->pdev, 1, 0);
+        if (!membase) {
+                pci_release_regions(priv->pdev);
+                return -EBUSY;
+        }
+        priv->membase = port->membase = membase;
+
+        return 0;
+}
+
+static void pch_uart_config_port(struct uart_port *port, int type)
+{
+        struct eg20t_port *priv;
+
+        priv = container_of(port, struct eg20t_port, port);
+        if (type & UART_CONFIG_TYPE) {
+                port->type = priv->port_type;
+                pch_uart_request_port(port);
+        }
+}
+
+static int pch_uart_verify_port(struct uart_port *port,
+                                struct serial_struct *serinfo)
+{
+        struct eg20t_port *priv;
+
+        priv = container_of(port, struct eg20t_port, port);
+        if (serinfo->flags & UPF_LOW_LATENCY) {
+                dev_info(priv->port.dev,
+                        "PCH UART : Use PIO Mode (without DMA)\n");
+                priv->use_dma = 0;
+                serinfo->flags &= ~UPF_LOW_LATENCY;
+        } else {
+#ifndef CONFIG_PCH_DMA
+                dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
+                        __func__);
+                return -EOPNOTSUPP;
+#endif
+                priv->use_dma = 1;
+                priv->use_dma_flag = 1;
+                dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
+        }
+
+        return 0;
+}
+
+static struct uart_ops pch_uart_ops = {
+        .tx_empty = pch_uart_tx_empty,
+        .set_mctrl = pch_uart_set_mctrl,
+        .get_mctrl = pch_uart_get_mctrl,
+        .stop_tx = pch_uart_stop_tx,
+        .start_tx = pch_uart_start_tx,
+        .stop_rx = pch_uart_stop_rx,
+        .enable_ms = pch_uart_enable_ms,
+        .break_ctl = pch_uart_break_ctl,
+        .startup = pch_uart_startup,
+        .shutdown = pch_uart_shutdown,
+        .set_termios = pch_uart_set_termios,
+/*      .pm             = pch_uart_pm,          Not supported yet */
+/*      .set_wake       = pch_uart_set_wake,    Not supported yet */
+        .type = pch_uart_type,
+        .release_port = pch_uart_release_port,
+        .request_port = pch_uart_request_port,
+        .config_port = pch_uart_config_port,
+        .verify_port = pch_uart_verify_port
+};
+
+static struct uart_driver pch_uart_driver = {
+        .owner = THIS_MODULE,
+        .driver_name = KBUILD_MODNAME,
+        .dev_name = PCH_UART_DRIVER_DEVICE,
+        .major = 0,
+        .minor = 0,
+        .nr = PCH_UART_NR,
+};
+
+static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
+                                             const struct pci_device_id *id)
+{
+        struct eg20t_port *priv;
+        int ret;
+        unsigned int iobase;
+        unsigned int mapbase;
+        unsigned char *rxbuf;
+        int fifosize, base_baud;
+        int port_type;
+        struct pch_uart_driver_data *board;
+        const char *board_name;
+
+        board = &drv_dat[id->driver_data];
+        port_type = board->port_type;
+
+        priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
+        if (priv == NULL)
+                goto init_port_alloc_err;
+
+        rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
+        if (!rxbuf)
+                goto init_port_free_txbuf;
+
+        base_baud = 1843200; /* 1.8432MHz */
+
+        /* quirk for CM-iTC board */
+        board_name = dmi_get_system_info(DMI_BOARD_NAME);
+        if (board_name && strstr(board_name, "CM-iTC"))
+                base_baud = 192000000; /* 192.0MHz */
+
+        switch (port_type) {
+        case PORT_UNKNOWN:
+                fifosize = 256; /* EG20T/ML7213: UART0 */
+                break;
+        case PORT_8250:
+                fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
+                break;
+        default:
+                dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
+                goto init_port_hal_free;
+        }
+
+        iobase = pci_resource_start(pdev, 0);
+        mapbase = pci_resource_start(pdev, 1);
+        priv->mapbase = mapbase;
+        priv->iobase = iobase;
+        priv->pdev = pdev;
+        priv->tx_empty = 1;
+        priv->rxbuf.buf = rxbuf;
+        priv->rxbuf.size = PAGE_SIZE;
+
+        priv->fifo_size = fifosize;
+        priv->base_baud = base_baud;
+        priv->port_type = PORT_MAX_8250 + port_type + 1;
+        priv->port.dev = &pdev->dev;
+        priv->port.iobase = iobase;
+        priv->port.membase = NULL;
+        priv->port.mapbase = mapbase;
+        priv->port.irq = pdev->irq;
+        priv->port.iotype = UPIO_PORT;
+        priv->port.ops = &pch_uart_ops;
+        priv->port.flags = UPF_BOOT_AUTOCONF;
+        priv->port.fifosize = fifosize;
+        priv->port.line = board->line_no;
+        priv->trigger = PCH_UART_HAL_TRIGGER_M;
+
+        spin_lock_init(&priv->port.lock);
+
+        pci_set_drvdata(pdev, priv);
+        pch_uart_hal_request(pdev, fifosize, base_baud);
+
+        ret = uart_add_one_port(&pch_uart_driver, &priv->port);
+        if (ret < 0)
+                goto init_port_hal_free;
+
+        return priv;
+
+init_port_hal_free:
+        free_page((unsigned long)rxbuf);
+init_port_free_txbuf:
+        kfree(priv);
+init_port_alloc_err:
+
+        return NULL;
+}
+
+static void pch_uart_exit_port(struct eg20t_port *priv)
+{
+        uart_remove_one_port(&pch_uart_driver, &priv->port);
+        pci_set_drvdata(priv->pdev, NULL);
+        free_page((unsigned long)priv->rxbuf.buf);
+}
+
+static void pch_uart_pci_remove(struct pci_dev *pdev)
+{
+        struct eg20t_port *priv;
+
+        priv = (struct eg20t_port *)pci_get_drvdata(pdev);
+        pch_uart_exit_port(priv);
+        pci_disable_device(pdev);
+        kfree(priv);
+        return;
+}
+#ifdef CONFIG_PM
+static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        struct eg20t_port *priv = pci_get_drvdata(pdev);
+
+        uart_suspend_port(&pch_uart_driver, &priv->port);
+
+        pci_save_state(pdev);
+        pci_set_power_state(pdev, pci_choose_state(pdev, state));
+        return 0;
+}
+
+static int pch_uart_pci_resume(struct pci_dev *pdev)
+{
+        struct eg20t_port *priv = pci_get_drvdata(pdev);
+        int ret;
+
+        pci_set_power_state(pdev, PCI_D0);
+        pci_restore_state(pdev);
+
+        ret = pci_enable_device(pdev);
+        if (ret) {
+                dev_err(&pdev->dev,
+                "%s-pci_enable_device failed(ret=%d) ", __func__, ret);
+                return ret;
+        }
+
+        uart_resume_port(&pch_uart_driver, &priv->port);
+
+        return 0;
+}
+#else
+#define pch_uart_pci_suspend NULL
+#define pch_uart_pci_resume NULL
+#endif
+
+static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
+        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
+         .driver_data = pch_et20t_uart0},
+        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
+         .driver_data = pch_et20t_uart1},
+        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
+         .driver_data = pch_et20t_uart2},
+        {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
+         .driver_data = pch_et20t_uart3},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
+         .driver_data = pch_ml7213_uart0},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
+         .driver_data = pch_ml7213_uart1},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
+         .driver_data = pch_ml7213_uart2},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
+         .driver_data = pch_ml7223_uart0},
+        {PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
+         .driver_data = pch_ml7223_uart1},
+        {0,},
+};
+
+static int __devinit pch_uart_pci_probe(struct pci_dev *pdev,
+                                        const struct pci_device_id *id)
+{
+        int ret;
+        struct eg20t_port *priv;
+
+        ret = pci_enable_device(pdev);
+        if (ret < 0)
+                goto probe_error;
+
+        priv = pch_uart_init_port(pdev, id);
+        if (!priv) {
+                ret = -EBUSY;
+                goto probe_disable_device;
+        }
+        pci_set_drvdata(pdev, priv);
+
+        return ret;
+
+probe_disable_device:
+        pci_disable_device(pdev);
+probe_error:
+        return ret;
+}
+
+static struct pci_driver pch_uart_pci_driver = {
+        .name = "pch_uart",
+        .id_table = pch_uart_pci_id,
+        .probe = pch_uart_pci_probe,
+        .remove = __devexit_p(pch_uart_pci_remove),
+        .suspend = pch_uart_pci_suspend,
+        .resume = pch_uart_pci_resume,
+};
+
+static int __init pch_uart_module_init(void)
+{
+        int ret;
+
+        /* register as UART driver */
+        ret = uart_register_driver(&pch_uart_driver);
+        if (ret < 0)
+                return ret;
+
+        /* register as PCI driver */
+        ret = pci_register_driver(&pch_uart_pci_driver);
+        if (ret < 0)
+                uart_unregister_driver(&pch_uart_driver);
+
+        return ret;
+}
+module_init(pch_uart_module_init);
+
+static void __exit pch_uart_module_exit(void)
+{
+        pci_unregister_driver(&pch_uart_pci_driver);
+        uart_unregister_driver(&pch_uart_driver);
+}
+module_exit(pch_uart_module_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
+module_param(default_baud, uint, S_IRUGO);
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
new file mode 100644
index 000000000000..5acd24a27d08
--- /dev/null
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -0,0 +1,2206 @@
+/*
+ * Driver for PowerMac Z85c30 based ESCC cell found in the
+ * "macio" ASICs of various PowerMac models
+ * 
+ * Copyright (C) 2003 Ben. Herrenschmidt (benh@kernel.crashing.org)
+ *
+ * Derived from drivers/macintosh/macserial.c by Paul Mackerras
+ * and drivers/serial/sunzilog.c by David S. Miller
+ *
+ * Hrm... actually, I ripped most of sunzilog (Thanks David !) and
+ * adapted special tweaks needed for us. I don't think it's worth
+ * merging back those though. The DMA code still has to get in
+ * and once done, I expect that driver to remain fairly stable in
+ * the long term, unless we change the driver model again...
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * 2004-08-06 Harald Welte <laforge@gnumonks.org>
+ *      - Enable BREAK interrupt
+ *      - Add support for sysreq
+ *
+ * TODO:   - Add DMA support
+ *         - Defer port shutdown to a few seconds after close
+ *         - maybe put something right into uap->clk_divisor
+ */
+
+#undef DEBUG
+#undef DEBUG_HARD
+#undef USE_CTRL_O_SYSRQ
+
+#include <linux/module.h>
+#include <linux/tty.h>
+
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <linux/bitops.h>
+#include <linux/sysrq.h>
+#include <linux/mutex.h>
+#include <asm/sections.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#ifdef CONFIG_PPC_PMAC
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/dbdma.h>
+#include <asm/macio.h>
+#else
+#include <linux/platform_device.h>
+#define of_machine_is_compatible(x) (0)
+#endif
+
+#if defined (CONFIG_SERIAL_PMACZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+
+#include "pmac_zilog.h"
+
+/* Not yet implemented */
+#undef HAS_DBDMA
+
+static char version[] __initdata = "pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
+MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
+#define PMACZILOG_MAJOR         TTY_MAJOR
+#define PMACZILOG_MINOR         64
+#define PMACZILOG_NAME          "ttyS"
+#else
+#define PMACZILOG_MAJOR         204
+#define PMACZILOG_MINOR         192
+#define PMACZILOG_NAME          "ttyPZ"
+#endif
+
+
+/*
+ * For the sake of early serial console, we can do a pre-probe
+ * (optional) of the ports at rather early boot time.
+ */
+static struct uart_pmac_port    pmz_ports[MAX_ZS_PORTS];
+static int                      pmz_ports_count;
+static DEFINE_MUTEX(pmz_irq_mutex);
+
+static struct uart_driver pmz_uart_reg = {
+        .owner          =       THIS_MODULE,
+        .driver_name    =       PMACZILOG_NAME,
+        .dev_name       =       PMACZILOG_NAME,
+        .major          =       PMACZILOG_MAJOR,
+        .minor          =       PMACZILOG_MINOR,
+};
+
+
+/* 
+ * Load all registers to reprogram the port
+ * This function must only be called when the TX is not busy.  The UART
+ * port lock must be held and local interrupts disabled.
+ */
+static void pmz_load_zsregs(struct uart_pmac_port *uap, u8 *regs)
+{
+        int i;
+
+        if (ZS_IS_ASLEEP(uap))
+                return;
+
+        /* Let pending transmits finish.  */
+        for (i = 0; i < 1000; i++) {
+                unsigned char stat = read_zsreg(uap, R1);
+                if (stat & ALL_SNT)
+                        break;
+                udelay(100);
+        }
+
+        ZS_CLEARERR(uap);
+        zssync(uap);
+        ZS_CLEARFIFO(uap);
+        zssync(uap);
+        ZS_CLEARERR(uap);
+
+        /* Disable all interrupts.  */
+        write_zsreg(uap, R1,
+                    regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
+
+        /* Set parity, sync config, stop bits, and clock divisor.  */
+        write_zsreg(uap, R4, regs[R4]);
+
+        /* Set misc. TX/RX control bits.  */
+        write_zsreg(uap, R10, regs[R10]);
+
+        /* Set TX/RX controls sans the enable bits.  */
+        write_zsreg(uap, R3, regs[R3] & ~RxENABLE);
+        write_zsreg(uap, R5, regs[R5] & ~TxENABLE);
+
+        /* now set R7 "prime" on ESCC */
+        write_zsreg(uap, R15, regs[R15] | EN85C30);
+        write_zsreg(uap, R7, regs[R7P]);
+
+        /* make sure we use R7 "non-prime" on ESCC */
+        write_zsreg(uap, R15, regs[R15] & ~EN85C30);
+
+        /* Synchronous mode config.  */
+        write_zsreg(uap, R6, regs[R6]);
+        write_zsreg(uap, R7, regs[R7]);
+
+        /* Disable baud generator.  */
+        write_zsreg(uap, R14, regs[R14] & ~BRENAB);
+
+        /* Clock mode control.  */
+        write_zsreg(uap, R11, regs[R11]);
+
+        /* Lower and upper byte of baud rate generator divisor.  */
+        write_zsreg(uap, R12, regs[R12]);
+        write_zsreg(uap, R13, regs[R13]);
+        
+        /* Now rewrite R14, with BRENAB (if set).  */
+        write_zsreg(uap, R14, regs[R14]);
+
+        /* Reset external status interrupts.  */
+        write_zsreg(uap, R0, RES_EXT_INT);
+        write_zsreg(uap, R0, RES_EXT_INT);
+
+        /* Rewrite R3/R5, this time without enables masked.  */
+        write_zsreg(uap, R3, regs[R3]);
+        write_zsreg(uap, R5, regs[R5]);
+
+        /* Rewrite R1, this time without IRQ enabled masked.  */
+        write_zsreg(uap, R1, regs[R1]);
+
+        /* Enable interrupts */
+        write_zsreg(uap, R9, regs[R9]);
+}
+
+/* 
+ * We do like sunzilog to avoid disrupting pending Tx
+ * Reprogram the Zilog channel HW registers with the copies found in the
+ * software state struct.  If the transmitter is busy, we defer this update
+ * until the next TX complete interrupt.  Else, we do it right now.
+ *
+ * The UART port lock must be held and local interrupts disabled.
+ */
+static void pmz_maybe_update_regs(struct uart_pmac_port *uap)
+{
+        if (!ZS_REGS_HELD(uap)) {
+                if (ZS_TX_ACTIVE(uap)) {
+                        uap->flags |= PMACZILOG_FLAG_REGS_HELD;
+                } else {
+                        pmz_debug("pmz: maybe_update_regs: updating\n");
+                        pmz_load_zsregs(uap, uap->curregs);
+                }
+        }
+}
+
+static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
+{
+        struct tty_struct *tty = NULL;
+        unsigned char ch, r1, drop, error, flag;
+        int loops = 0;
+
+        /* The interrupt can be enabled when the port isn't open, typically
+         * that happens when using one port is open and the other closed (stale
+         * interrupt) or when one port is used as a console.
+         */
+        if (!ZS_IS_OPEN(uap)) {
+                pmz_debug("pmz: draining input\n");
+                /* Port is closed, drain input data */
+                for (;;) {
+                        if ((++loops) > 1000)
+                                goto flood;
+                        (void)read_zsreg(uap, R1);
+                        write_zsreg(uap, R0, ERR_RES);
+                        (void)read_zsdata(uap);
+                        ch = read_zsreg(uap, R0);
+                        if (!(ch & Rx_CH_AV))
+                                break;
+                }
+                return NULL;
+        }
+
+        /* Sanity check, make sure the old bug is no longer happening */
+        if (uap->port.state == NULL || uap->port.state->port.tty == NULL) {
+                WARN_ON(1);
+                (void)read_zsdata(uap);
+                return NULL;
+        }
+        tty = uap->port.state->port.tty;
+
+        while (1) {
+                error = 0;
+                drop = 0;
+
+                r1 = read_zsreg(uap, R1);
+                ch = read_zsdata(uap);
+
+                if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+                        write_zsreg(uap, R0, ERR_RES);
+                        zssync(uap);
+                }
+
+                ch &= uap->parity_mask;
+                if (ch == 0 && uap->flags & PMACZILOG_FLAG_BREAK) {
+                        uap->flags &= ~PMACZILOG_FLAG_BREAK;
+                }
+
+#if defined(CONFIG_MAGIC_SYSRQ) && defined(CONFIG_SERIAL_CORE_CONSOLE)
+#ifdef USE_CTRL_O_SYSRQ
+                /* Handle the SysRq ^O Hack */
+                if (ch == '\x0f') {
+                        uap->port.sysrq = jiffies + HZ*5;
+                        goto next_char;
+                }
+#endif /* USE_CTRL_O_SYSRQ */
+                if (uap->port.sysrq) {
+                        int swallow;
+                        spin_unlock(&uap->port.lock);
+                        swallow = uart_handle_sysrq_char(&uap->port, ch);
+                        spin_lock(&uap->port.lock);
+                        if (swallow)
+                                goto next_char;
+                }
+#endif /* CONFIG_MAGIC_SYSRQ && CONFIG_SERIAL_CORE_CONSOLE */
+
+                /* A real serial line, record the character and status.  */
+                if (drop)
+                        goto next_char;
+
+                flag = TTY_NORMAL;
+                uap->port.icount.rx++;
+
+                if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
+                        error = 1;
+                        if (r1 & BRK_ABRT) {
+                                pmz_debug("pmz: got break !\n");
+                                r1 &= ~(PAR_ERR | CRC_ERR);
+                                uap->port.icount.brk++;
+                                if (uart_handle_break(&uap->port))
+                                        goto next_char;
+                        }
+                        else if (r1 & PAR_ERR)
+                                uap->port.icount.parity++;
+                        else if (r1 & CRC_ERR)
+                                uap->port.icount.frame++;
+                        if (r1 & Rx_OVR)
+                                uap->port.icount.overrun++;
+                        r1 &= uap->port.read_status_mask;
+                        if (r1 & BRK_ABRT)
+                                flag = TTY_BREAK;
+                        else if (r1 & PAR_ERR)
+                                flag = TTY_PARITY;
+                        else if (r1 & CRC_ERR)
+                                flag = TTY_FRAME;
+                }
+
+                if (uap->port.ignore_status_mask == 0xff ||
+                    (r1 & uap->port.ignore_status_mask) == 0) {
+                        tty_insert_flip_char(tty, ch, flag);
+                }
+                if (r1 & Rx_OVR)
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+        next_char:
+                /* We can get stuck in an infinite loop getting char 0 when the
+                 * line is in a wrong HW state, we break that here.
+                 * When that happens, I disable the receive side of the driver.
+                 * Note that what I've been experiencing is a real irq loop where
+                 * I'm getting flooded regardless of the actual port speed.
+                 * Something strange is going on with the HW
+                 */
+                if ((++loops) > 1000)
+                        goto flood;
+                ch = read_zsreg(uap, R0);
+                if (!(ch & Rx_CH_AV))
+                        break;
+        }
+
+        return tty;
+ flood:
+        uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+        write_zsreg(uap, R1, uap->curregs[R1]);
+        zssync(uap);
+        pmz_error("pmz: rx irq flood !\n");
+        return tty;
+}
+
+static void pmz_status_handle(struct uart_pmac_port *uap)
+{
+        unsigned char status;
+
+        status = read_zsreg(uap, R0);
+        write_zsreg(uap, R0, RES_EXT_INT);
+        zssync(uap);
+
+        if (ZS_IS_OPEN(uap) && ZS_WANTS_MODEM_STATUS(uap)) {
+                if (status & SYNC_HUNT)
+                        uap->port.icount.dsr++;
+
+                /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
+                 * But it does not tell us which bit has changed, we have to keep
+                 * track of this ourselves.
+                 * The CTS input is inverted for some reason.  -- paulus
+                 */
+                if ((status ^ uap->prev_status) & DCD)
+                        uart_handle_dcd_change(&uap->port,
+                                               (status & DCD));
+                if ((status ^ uap->prev_status) & CTS)
+                        uart_handle_cts_change(&uap->port,
+                                               !(status & CTS));
+
+                wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
+        }
+
+        if (status & BRK_ABRT)
+                uap->flags |= PMACZILOG_FLAG_BREAK;
+
+        uap->prev_status = status;
+}
+
+static void pmz_transmit_chars(struct uart_pmac_port *uap)
+{
+        struct circ_buf *xmit;
+
+        if (ZS_IS_ASLEEP(uap))
+                return;
+        if (ZS_IS_CONS(uap)) {
+                unsigned char status = read_zsreg(uap, R0);
+
+                /* TX still busy?  Just wait for the next TX done interrupt.
+                 *
+                 * It can occur because of how we do serial console writes.  It would
+                 * be nice to transmit console writes just like we normally would for
+                 * a TTY line. (ie. buffered and TX interrupt driven).  That is not
+                 * easy because console writes cannot sleep.  One solution might be
+                 * to poll on enough port->xmit space becoming free.  -DaveM
+                 */
+                if (!(status & Tx_BUF_EMP))
+                        return;
+        }
+
+        uap->flags &= ~PMACZILOG_FLAG_TX_ACTIVE;
+
+        if (ZS_REGS_HELD(uap)) {
+                pmz_load_zsregs(uap, uap->curregs);
+                uap->flags &= ~PMACZILOG_FLAG_REGS_HELD;
+        }
+
+        if (ZS_TX_STOPPED(uap)) {
+                uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
+                goto ack_tx_int;
+        }
+
+        /* Under some circumstances, we see interrupts reported for
+         * a closed channel. The interrupt mask in R1 is clear, but
+         * R3 still signals the interrupts and we see them when taking
+         * an interrupt for the other channel (this could be a qemu
+         * bug but since the ESCC doc doesn't specify precsiely whether
+         * R3 interrup status bits are masked by R1 interrupt enable
+         * bits, better safe than sorry). --BenH.
+         */
+        if (!ZS_IS_OPEN(uap))
+                goto ack_tx_int;
+
+        if (uap->port.x_char) {
+                uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
+                write_zsdata(uap, uap->port.x_char);
+                zssync(uap);
+                uap->port.icount.tx++;
+                uap->port.x_char = 0;
+                return;
+        }
+
+        if (uap->port.state == NULL)
+                goto ack_tx_int;
+        xmit = &uap->port.state->xmit;
+        if (uart_circ_empty(xmit)) {
+                uart_write_wakeup(&uap->port);
+                goto ack_tx_int;
+        }
+        if (uart_tx_stopped(&uap->port))
+                goto ack_tx_int;
+
+        uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
+        write_zsdata(uap, xmit->buf[xmit->tail]);
+        zssync(uap);
+
+        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+        uap->port.icount.tx++;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&uap->port);
+
+        return;
+
+ack_tx_int:
+        write_zsreg(uap, R0, RES_Tx_P);
+        zssync(uap);
+}
+
+/* Hrm... we register that twice, fixme later.... */
+static irqreturn_t pmz_interrupt(int irq, void *dev_id)
+{
+        struct uart_pmac_port *uap = dev_id;
+        struct uart_pmac_port *uap_a;
+        struct uart_pmac_port *uap_b;
+        int rc = IRQ_NONE;
+        struct tty_struct *tty;
+        u8 r3;
+
+        uap_a = pmz_get_port_A(uap);
+        uap_b = uap_a->mate;
+
+        spin_lock(&uap_a->port.lock);
+        r3 = read_zsreg(uap_a, R3);
+
+#ifdef DEBUG_HARD
+        pmz_debug("irq, r3: %x\n", r3);
+#endif
+        /* Channel A */
+        tty = NULL;
+        if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
+                write_zsreg(uap_a, R0, RES_H_IUS);
+                zssync(uap_a);          
+                if (r3 & CHAEXT)
+                        pmz_status_handle(uap_a);
+                if (r3 & CHARxIP)
+                        tty = pmz_receive_chars(uap_a);
+                if (r3 & CHATxIP)
+                        pmz_transmit_chars(uap_a);
+                rc = IRQ_HANDLED;
+        }
+        spin_unlock(&uap_a->port.lock);
+        if (tty != NULL)
+                tty_flip_buffer_push(tty);
+
+        if (uap_b->node == NULL)
+                goto out;
+
+        spin_lock(&uap_b->port.lock);
+        tty = NULL;
+        if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
+                write_zsreg(uap_b, R0, RES_H_IUS);
+                zssync(uap_b);
+                if (r3 & CHBEXT)
+                        pmz_status_handle(uap_b);
+                if (r3 & CHBRxIP)
+                        tty = pmz_receive_chars(uap_b);
+                if (r3 & CHBTxIP)
+                        pmz_transmit_chars(uap_b);
+                rc = IRQ_HANDLED;
+        }
+        spin_unlock(&uap_b->port.lock);
+        if (tty != NULL)
+                tty_flip_buffer_push(tty);
+
+ out:
+#ifdef DEBUG_HARD
+        pmz_debug("irq done.\n");
+#endif
+        return rc;
+}
+
+/*
+ * Peek the status register, lock not held by caller
+ */
+static inline u8 pmz_peek_status(struct uart_pmac_port *uap)
+{
+        unsigned long flags;
+        u8 status;
+        
+        spin_lock_irqsave(&uap->port.lock, flags);
+        status = read_zsreg(uap, R0);
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+
+        return status;
+}
+
+/* 
+ * Check if transmitter is empty
+ * The port lock is not held.
+ */
+static unsigned int pmz_tx_empty(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned char status;
+
+        if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+                return TIOCSER_TEMT;
+
+        status = pmz_peek_status(to_pmz(port));
+        if (status & Tx_BUF_EMP)
+                return TIOCSER_TEMT;
+        return 0;
+}
+
+/* 
+ * Set Modem Control (RTS & DTR) bits
+ * The port lock is held and interrupts are disabled.
+ * Note: Shall we really filter out RTS on external ports or
+ * should that be dealt at higher level only ?
+ */
+static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned char set_bits, clear_bits;
+
+        /* Do nothing for irda for now... */
+        if (ZS_IS_IRDA(uap))
+                return;
+        /* We get called during boot with a port not up yet */
+        if (ZS_IS_ASLEEP(uap) ||
+            !(ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)))
+                return;
+
+        set_bits = clear_bits = 0;
+
+        if (ZS_IS_INTMODEM(uap)) {
+                if (mctrl & TIOCM_RTS)
+                        set_bits |= RTS;
+                else
+                        clear_bits |= RTS;
+        }
+        if (mctrl & TIOCM_DTR)
+                set_bits |= DTR;
+        else
+                clear_bits |= DTR;
+
+        /* NOTE: Not subject to 'transmitter active' rule.  */ 
+        uap->curregs[R5] |= set_bits;
+        uap->curregs[R5] &= ~clear_bits;
+        if (ZS_IS_ASLEEP(uap))
+                return;
+        write_zsreg(uap, R5, uap->curregs[R5]);
+        pmz_debug("pmz_set_mctrl: set bits: %x, clear bits: %x -> %x\n",
+                  set_bits, clear_bits, uap->curregs[R5]);
+        zssync(uap);
+}
+
+/* 
+ * Get Modem Control bits (only the input ones, the core will
+ * or that with a cached value of the control ones)
+ * The port lock is held and interrupts are disabled.
+ */
+static unsigned int pmz_get_mctrl(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned char status;
+        unsigned int ret;
+
+        if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+                return 0;
+
+        status = read_zsreg(uap, R0);
+
+        ret = 0;
+        if (status & DCD)
+                ret |= TIOCM_CAR;
+        if (status & SYNC_HUNT)
+                ret |= TIOCM_DSR;
+        if (!(status & CTS))
+                ret |= TIOCM_CTS;
+
+        return ret;
+}
+
+/* 
+ * Stop TX side. Dealt like sunzilog at next Tx interrupt,
+ * though for DMA, we will have to do a bit more.
+ * The port lock is held and interrupts are disabled.
+ */
+static void pmz_stop_tx(struct uart_port *port)
+{
+        to_pmz(port)->flags |= PMACZILOG_FLAG_TX_STOPPED;
+}
+
+/* 
+ * Kick the Tx side.
+ * The port lock is held and interrupts are disabled.
+ */
+static void pmz_start_tx(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned char status;
+
+        pmz_debug("pmz: start_tx()\n");
+
+        uap->flags |= PMACZILOG_FLAG_TX_ACTIVE;
+        uap->flags &= ~PMACZILOG_FLAG_TX_STOPPED;
+
+        if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+                return;
+
+        status = read_zsreg(uap, R0);
+
+        /* TX busy?  Just wait for the TX done interrupt.  */
+        if (!(status & Tx_BUF_EMP))
+                return;
+
+        /* Send the first character to jump-start the TX done
+         * IRQ sending engine.
+         */
+        if (port->x_char) {
+                write_zsdata(uap, port->x_char);
+                zssync(uap);
+                port->icount.tx++;
+                port->x_char = 0;
+        } else {
+                struct circ_buf *xmit = &port->state->xmit;
+
+                write_zsdata(uap, xmit->buf[xmit->tail]);
+                zssync(uap);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+
+                if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                        uart_write_wakeup(&uap->port);
+        }
+        pmz_debug("pmz: start_tx() done.\n");
+}
+
+/* 
+ * Stop Rx side, basically disable emitting of
+ * Rx interrupts on the port. We don't disable the rx
+ * side of the chip proper though
+ * The port lock is held.
+ */
+static void pmz_stop_rx(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+
+        if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
+                return;
+
+        pmz_debug("pmz: stop_rx()()\n");
+
+        /* Disable all RX interrupts.  */
+        uap->curregs[R1] &= ~RxINT_MASK;
+        pmz_maybe_update_regs(uap);
+
+        pmz_debug("pmz: stop_rx() done.\n");
+}
+
+/* 
+ * Enable modem status change interrupts
+ * The port lock is held.
+ */
+static void pmz_enable_ms(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned char new_reg;
+
+        if (ZS_IS_IRDA(uap) || uap->node == NULL)
+                return;
+        new_reg = uap->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
+        if (new_reg != uap->curregs[R15]) {
+                uap->curregs[R15] = new_reg;
+
+                if (ZS_IS_ASLEEP(uap))
+                        return;
+                /* NOTE: Not subject to 'transmitter active' rule. */
+                write_zsreg(uap, R15, uap->curregs[R15]);
+        }
+}
+
+/* 
+ * Control break state emission
+ * The port lock is not held.
+ */
+static void pmz_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned char set_bits, clear_bits, new_reg;
+        unsigned long flags;
+
+        if (uap->node == NULL)
+                return;
+        set_bits = clear_bits = 0;
+
+        if (break_state)
+                set_bits |= SND_BRK;
+        else
+                clear_bits |= SND_BRK;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        new_reg = (uap->curregs[R5] | set_bits) & ~clear_bits;
+        if (new_reg != uap->curregs[R5]) {
+                uap->curregs[R5] = new_reg;
+
+                /* NOTE: Not subject to 'transmitter active' rule. */
+                if (ZS_IS_ASLEEP(uap)) {
+                        spin_unlock_irqrestore(&port->lock, flags);
+                        return;
+                }
+                write_zsreg(uap, R5, uap->curregs[R5]);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+#ifdef CONFIG_PPC_PMAC
+
+/*
+ * Turn power on or off to the SCC and associated stuff
+ * (port drivers, modem, IR port, etc.)
+ * Returns the number of milliseconds we should wait before
+ * trying to use the port.
+ */
+static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
+{
+        int delay = 0;
+        int rc;
+
+        if (state) {
+                rc = pmac_call_feature(
+                        PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 1);
+                pmz_debug("port power on result: %d\n", rc);
+                if (ZS_IS_INTMODEM(uap)) {
+                        rc = pmac_call_feature(
+                                PMAC_FTR_MODEM_ENABLE, uap->node, 0, 1);
+                        delay = 2500;   /* wait for 2.5s before using */
+                        pmz_debug("modem power result: %d\n", rc);
+                }
+        } else {
+                /* TODO: Make that depend on a timer, don't power down
+                 * immediately
+                 */
+                if (ZS_IS_INTMODEM(uap)) {
+                        rc = pmac_call_feature(
+                                PMAC_FTR_MODEM_ENABLE, uap->node, 0, 0);
+                        pmz_debug("port power off result: %d\n", rc);
+                }
+                pmac_call_feature(PMAC_FTR_SCC_ENABLE, uap->node, uap->port_type, 0);
+        }
+        return delay;
+}
+
+#else
+
+static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
+{
+        return 0;
+}
+
+#endif /* !CONFIG_PPC_PMAC */
+
+/*
+ * FixZeroBug....Works around a bug in the SCC receiving channel.
+ * Inspired from Darwin code, 15 Sept. 2000  -DanM
+ *
+ * The following sequence prevents a problem that is seen with O'Hare ASICs
+ * (most versions -- also with some Heathrow and Hydra ASICs) where a zero
+ * at the input to the receiver becomes 'stuck' and locks up the receiver.
+ * This problem can occur as a result of a zero bit at the receiver input
+ * coincident with any of the following events:
+ *
+ *      The SCC is initialized (hardware or software).
+ *      A framing error is detected.
+ *      The clocking option changes from synchronous or X1 asynchronous
+ *              clocking to X16, X32, or X64 asynchronous clocking.
+ *      The decoding mode is changed among NRZ, NRZI, FM0, or FM1.
+ *
+ * This workaround attempts to recover from the lockup condition by placing
+ * the SCC in synchronous loopback mode with a fast clock before programming
+ * any of the asynchronous modes.
+ */
+static void pmz_fix_zero_bug_scc(struct uart_pmac_port *uap)
+{
+        write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
+        zssync(uap);
+        udelay(10);
+        write_zsreg(uap, 9, (ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB) | NV);
+        zssync(uap);
+
+        write_zsreg(uap, 4, X1CLK | MONSYNC);
+        write_zsreg(uap, 3, Rx8);
+        write_zsreg(uap, 5, Tx8 | RTS);
+        write_zsreg(uap, 9, NV);        /* Didn't we already do this? */
+        write_zsreg(uap, 11, RCBR | TCBR);
+        write_zsreg(uap, 12, 0);
+        write_zsreg(uap, 13, 0);
+        write_zsreg(uap, 14, (LOOPBAK | BRSRC));
+        write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB));
+        write_zsreg(uap, 3, Rx8 | RxENABLE);
+        write_zsreg(uap, 0, RES_EXT_INT);
+        write_zsreg(uap, 0, RES_EXT_INT);
+        write_zsreg(uap, 0, RES_EXT_INT);       /* to kill some time */
+
+        /* The channel should be OK now, but it is probably receiving
+         * loopback garbage.
+         * Switch to asynchronous mode, disable the receiver,
+         * and discard everything in the receive buffer.
+         */
+        write_zsreg(uap, 9, NV);
+        write_zsreg(uap, 4, X16CLK | SB_MASK);
+        write_zsreg(uap, 3, Rx8);
+
+        while (read_zsreg(uap, 0) & Rx_CH_AV) {
+                (void)read_zsreg(uap, 8);
+                write_zsreg(uap, 0, RES_EXT_INT);
+                write_zsreg(uap, 0, ERR_RES);
+        }
+}
+
+/*
+ * Real startup routine, powers up the hardware and sets up
+ * the SCC. Returns a delay in ms where you need to wait before
+ * actually using the port, this is typically the internal modem
+ * powerup delay. This routine expect the lock to be taken.
+ */
+static int __pmz_startup(struct uart_pmac_port *uap)
+{
+        int pwr_delay = 0;
+
+        memset(&uap->curregs, 0, sizeof(uap->curregs));
+
+        /* Power up the SCC & underlying hardware (modem/irda) */
+        pwr_delay = pmz_set_scc_power(uap, 1);
+
+        /* Nice buggy HW ... */
+        pmz_fix_zero_bug_scc(uap);
+
+        /* Reset the channel */
+        uap->curregs[R9] = 0;
+        write_zsreg(uap, 9, ZS_IS_CHANNEL_A(uap) ? CHRA : CHRB);
+        zssync(uap);
+        udelay(10);
+        write_zsreg(uap, 9, 0);
+        zssync(uap);
+
+        /* Clear the interrupt registers */
+        write_zsreg(uap, R1, 0);
+        write_zsreg(uap, R0, ERR_RES);
+        write_zsreg(uap, R0, ERR_RES);
+        write_zsreg(uap, R0, RES_H_IUS);
+        write_zsreg(uap, R0, RES_H_IUS);
+
+        /* Setup some valid baud rate */
+        uap->curregs[R4] = X16CLK | SB1;
+        uap->curregs[R3] = Rx8;
+        uap->curregs[R5] = Tx8 | RTS;
+        if (!ZS_IS_IRDA(uap))
+                uap->curregs[R5] |= DTR;
+        uap->curregs[R12] = 0;
+        uap->curregs[R13] = 0;
+        uap->curregs[R14] = BRENAB;
+
+        /* Clear handshaking, enable BREAK interrupts */
+        uap->curregs[R15] = BRKIE;
+
+        /* Master interrupt enable */
+        uap->curregs[R9] |= NV | MIE;
+
+        pmz_load_zsregs(uap, uap->curregs);
+
+        /* Enable receiver and transmitter.  */
+        write_zsreg(uap, R3, uap->curregs[R3] |= RxENABLE);
+        write_zsreg(uap, R5, uap->curregs[R5] |= TxENABLE);
+
+        /* Remember status for DCD/CTS changes */
+        uap->prev_status = read_zsreg(uap, R0);
+
+        return pwr_delay;
+}
+
+static void pmz_irda_reset(struct uart_pmac_port *uap)
+{
+        uap->curregs[R5] |= DTR;
+        write_zsreg(uap, R5, uap->curregs[R5]);
+        zssync(uap);
+        mdelay(110);
+        uap->curregs[R5] &= ~DTR;
+        write_zsreg(uap, R5, uap->curregs[R5]);
+        zssync(uap);
+        mdelay(10);
+}
+
+/*
+ * This is the "normal" startup routine, using the above one
+ * wrapped with the lock and doing a schedule delay
+ */
+static int pmz_startup(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned long flags;
+        int pwr_delay = 0;
+
+        pmz_debug("pmz: startup()\n");
+
+        if (ZS_IS_ASLEEP(uap))
+                return -EAGAIN;
+        if (uap->node == NULL)
+                return -ENODEV;
+
+        mutex_lock(&pmz_irq_mutex);
+
+        uap->flags |= PMACZILOG_FLAG_IS_OPEN;
+
+        /* A console is never powered down. Else, power up and
+         * initialize the chip
+         */
+        if (!ZS_IS_CONS(uap)) {
+                spin_lock_irqsave(&port->lock, flags);
+                pwr_delay = __pmz_startup(uap);
+                spin_unlock_irqrestore(&port->lock, flags);
+        }       
+
+        pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON;
+        if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED,
+                        "SCC", uap)) {
+                pmz_error("Unable to register zs interrupt handler.\n");
+                pmz_set_scc_power(uap, 0);
+                mutex_unlock(&pmz_irq_mutex);
+                return -ENXIO;
+        }
+
+        mutex_unlock(&pmz_irq_mutex);
+
+        /* Right now, we deal with delay by blocking here, I'll be
+         * smarter later on
+         */
+        if (pwr_delay != 0) {
+                pmz_debug("pmz: delaying %d ms\n", pwr_delay);
+                msleep(pwr_delay);
+        }
+
+        /* IrDA reset is done now */
+        if (ZS_IS_IRDA(uap))
+                pmz_irda_reset(uap);
+
+        /* Enable interrupts emission from the chip */
+        spin_lock_irqsave(&port->lock, flags);
+        uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
+        if (!ZS_IS_EXTCLK(uap))
+                uap->curregs[R1] |= EXT_INT_ENAB;
+        write_zsreg(uap, R1, uap->curregs[R1]);
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        pmz_debug("pmz: startup() done.\n");
+
+        return 0;
+}
+
+static void pmz_shutdown(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned long flags;
+
+        pmz_debug("pmz: shutdown()\n");
+
+        if (uap->node == NULL)
+                return;
+
+        mutex_lock(&pmz_irq_mutex);
+
+        /* Release interrupt handler */
+        free_irq(uap->port.irq, uap);
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        uap->flags &= ~PMACZILOG_FLAG_IS_OPEN;
+
+        if (!ZS_IS_OPEN(uap->mate))
+                pmz_get_port_A(uap)->flags &= ~PMACZILOG_FLAG_IS_IRQ_ON;
+
+        /* Disable interrupts */
+        if (!ZS_IS_ASLEEP(uap)) {
+                uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+                write_zsreg(uap, R1, uap->curregs[R1]);
+                zssync(uap);
+        }
+
+        if (ZS_IS_CONS(uap) || ZS_IS_ASLEEP(uap)) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                mutex_unlock(&pmz_irq_mutex);
+                return;
+        }
+
+        /* Disable receiver and transmitter.  */
+        uap->curregs[R3] &= ~RxENABLE;
+        uap->curregs[R5] &= ~TxENABLE;
+
+        /* Disable all interrupts and BRK assertion.  */
+        uap->curregs[R5] &= ~SND_BRK;
+        pmz_maybe_update_regs(uap);
+
+        /* Shut the chip down */
+        pmz_set_scc_power(uap, 0);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        mutex_unlock(&pmz_irq_mutex);
+
+        pmz_debug("pmz: shutdown() done.\n");
+}
+
+/* Shared by TTY driver and serial console setup.  The port lock is held
+ * and local interrupts are disabled.
+ */
+static void pmz_convert_to_zs(struct uart_pmac_port *uap, unsigned int cflag,
+                              unsigned int iflag, unsigned long baud)
+{
+        int brg;
+
+        /* Switch to external clocking for IrDA high clock rates. That
+         * code could be re-used for Midi interfaces with different
+         * multipliers
+         */
+        if (baud >= 115200 && ZS_IS_IRDA(uap)) {
+                uap->curregs[R4] = X1CLK;
+                uap->curregs[R11] = RCTRxCP | TCTRxCP;
+                uap->curregs[R14] = 0; /* BRG off */
+                uap->curregs[R12] = 0;
+                uap->curregs[R13] = 0;
+                uap->flags |= PMACZILOG_FLAG_IS_EXTCLK;
+        } else {
+                switch (baud) {
+                case ZS_CLOCK/16:       /* 230400 */
+                        uap->curregs[R4] = X16CLK;
+                        uap->curregs[R11] = 0;
+                        uap->curregs[R14] = 0;
+                        break;
+                case ZS_CLOCK/32:       /* 115200 */
+                        uap->curregs[R4] = X32CLK;
+                        uap->curregs[R11] = 0;
+                        uap->curregs[R14] = 0;
+                        break;
+                default:
+                        uap->curregs[R4] = X16CLK;
+                        uap->curregs[R11] = TCBR | RCBR;
+                        brg = BPS_TO_BRG(baud, ZS_CLOCK / 16);
+                        uap->curregs[R12] = (brg & 255);
+                        uap->curregs[R13] = ((brg >> 8) & 255);
+                        uap->curregs[R14] = BRENAB;
+                }
+                uap->flags &= ~PMACZILOG_FLAG_IS_EXTCLK;
+        }
+
+        /* Character size, stop bits, and parity. */
+        uap->curregs[3] &= ~RxN_MASK;
+        uap->curregs[5] &= ~TxN_MASK;
+
+        switch (cflag & CSIZE) {
+        case CS5:
+                uap->curregs[3] |= Rx5;
+                uap->curregs[5] |= Tx5;
+                uap->parity_mask = 0x1f;
+                break;
+        case CS6:
+                uap->curregs[3] |= Rx6;
+                uap->curregs[5] |= Tx6;
+                uap->parity_mask = 0x3f;
+                break;
+        case CS7:
+                uap->curregs[3] |= Rx7;
+                uap->curregs[5] |= Tx7;
+                uap->parity_mask = 0x7f;
+                break;
+        case CS8:
+        default:
+                uap->curregs[3] |= Rx8;
+                uap->curregs[5] |= Tx8;
+                uap->parity_mask = 0xff;
+                break;
+        };
+        uap->curregs[4] &= ~(SB_MASK);
+        if (cflag & CSTOPB)
+                uap->curregs[4] |= SB2;
+        else
+                uap->curregs[4] |= SB1;
+        if (cflag & PARENB)
+                uap->curregs[4] |= PAR_ENAB;
+        else
+                uap->curregs[4] &= ~PAR_ENAB;
+        if (!(cflag & PARODD))
+                uap->curregs[4] |= PAR_EVEN;
+        else
+                uap->curregs[4] &= ~PAR_EVEN;
+
+        uap->port.read_status_mask = Rx_OVR;
+        if (iflag & INPCK)
+                uap->port.read_status_mask |= CRC_ERR | PAR_ERR;
+        if (iflag & (BRKINT | PARMRK))
+                uap->port.read_status_mask |= BRK_ABRT;
+
+        uap->port.ignore_status_mask = 0;
+        if (iflag & IGNPAR)
+                uap->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
+        if (iflag & IGNBRK) {
+                uap->port.ignore_status_mask |= BRK_ABRT;
+                if (iflag & IGNPAR)
+                        uap->port.ignore_status_mask |= Rx_OVR;
+        }
+
+        if ((cflag & CREAD) == 0)
+                uap->port.ignore_status_mask = 0xff;
+}
+
+
+/*
+ * Set the irda codec on the imac to the specified baud rate.
+ */
+static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
+{
+        u8 cmdbyte;
+        int t, version;
+
+        switch (*baud) {
+        /* SIR modes */
+        case 2400:
+                cmdbyte = 0x53;
+                break;
+        case 4800:
+                cmdbyte = 0x52;
+                break;
+        case 9600:
+                cmdbyte = 0x51;
+                break;
+        case 19200:
+                cmdbyte = 0x50;
+                break;
+        case 38400:
+                cmdbyte = 0x4f;
+                break;
+        case 57600:
+                cmdbyte = 0x4e;
+                break;
+        case 115200:
+                cmdbyte = 0x4d;
+                break;
+        /* The FIR modes aren't really supported at this point, how
+         * do we select the speed ? via the FCR on KeyLargo ?
+         */
+        case 1152000:
+                cmdbyte = 0;
+                break;
+        case 4000000:
+                cmdbyte = 0;
+                break;
+        default: /* 9600 */
+                cmdbyte = 0x51;
+                *baud = 9600;
+                break;
+        }
+
+        /* Wait for transmitter to drain */
+        t = 10000;
+        while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0
+               || (read_zsreg(uap, R1) & ALL_SNT) == 0) {
+                if (--t <= 0) {
+                        pmz_error("transmitter didn't drain\n");
+                        return;
+                }
+                udelay(10);
+        }
+
+        /* Drain the receiver too */
+        t = 100;
+        (void)read_zsdata(uap);
+        (void)read_zsdata(uap);
+        (void)read_zsdata(uap);
+        mdelay(10);
+        while (read_zsreg(uap, R0) & Rx_CH_AV) {
+                read_zsdata(uap);
+                mdelay(10);
+                if (--t <= 0) {
+                        pmz_error("receiver didn't drain\n");
+                        return;
+                }
+        }
+
+        /* Switch to command mode */
+        uap->curregs[R5] |= DTR;
+        write_zsreg(uap, R5, uap->curregs[R5]);
+        zssync(uap);
+        mdelay(1);
+
+        /* Switch SCC to 19200 */
+        pmz_convert_to_zs(uap, CS8, 0, 19200);          
+        pmz_load_zsregs(uap, uap->curregs);
+        mdelay(1);
+
+        /* Write get_version command byte */
+        write_zsdata(uap, 1);
+        t = 5000;
+        while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
+                if (--t <= 0) {
+                        pmz_error("irda_setup timed out on get_version byte\n");
+                        goto out;
+                }
+                udelay(10);
+        }
+        version = read_zsdata(uap);
+
+        if (version < 4) {
+                pmz_info("IrDA: dongle version %d not supported\n", version);
+                goto out;
+        }
+
+        /* Send speed mode */
+        write_zsdata(uap, cmdbyte);
+        t = 5000;
+        while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
+                if (--t <= 0) {
+                        pmz_error("irda_setup timed out on speed mode byte\n");
+                        goto out;
+                }
+                udelay(10);
+        }
+        t = read_zsdata(uap);
+        if (t != cmdbyte)
+                pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
+
+        pmz_info("IrDA setup for %ld bps, dongle version: %d\n",
+                 *baud, version);
+
+        (void)read_zsdata(uap);
+        (void)read_zsdata(uap);
+        (void)read_zsdata(uap);
+
+ out:
+        /* Switch back to data mode */
+        uap->curregs[R5] &= ~DTR;
+        write_zsreg(uap, R5, uap->curregs[R5]);
+        zssync(uap);
+
+        (void)read_zsdata(uap);
+        (void)read_zsdata(uap);
+        (void)read_zsdata(uap);
+}
+
+
+static void __pmz_set_termios(struct uart_port *port, struct ktermios *termios,
+                              struct ktermios *old)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned long baud;
+
+        pmz_debug("pmz: set_termios()\n");
+
+        if (ZS_IS_ASLEEP(uap))
+                return;
+
+        memcpy(&uap->termios_cache, termios, sizeof(struct ktermios));
+
+        /* XXX Check which revs of machines actually allow 1 and 4Mb speeds
+         * on the IR dongle. Note that the IRTTY driver currently doesn't know
+         * about the FIR mode and high speed modes. So these are unused. For
+         * implementing proper support for these, we should probably add some
+         * DMA as well, at least on the Rx side, which isn't a simple thing
+         * at this point.
+         */
+        if (ZS_IS_IRDA(uap)) {
+                /* Calc baud rate */
+                baud = uart_get_baud_rate(port, termios, old, 1200, 4000000);
+                pmz_debug("pmz: switch IRDA to %ld bauds\n", baud);
+                /* Cet the irda codec to the right rate */
+                pmz_irda_setup(uap, &baud);
+                /* Set final baud rate */
+                pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
+                pmz_load_zsregs(uap, uap->curregs);
+                zssync(uap);
+        } else {
+                baud = uart_get_baud_rate(port, termios, old, 1200, 230400);
+                pmz_convert_to_zs(uap, termios->c_cflag, termios->c_iflag, baud);
+                /* Make sure modem status interrupts are correctly configured */
+                if (UART_ENABLE_MS(&uap->port, termios->c_cflag)) {
+                        uap->curregs[R15] |= DCDIE | SYNCIE | CTSIE;
+                        uap->flags |= PMACZILOG_FLAG_MODEM_STATUS;
+                } else {
+                        uap->curregs[R15] &= ~(DCDIE | SYNCIE | CTSIE);
+                        uap->flags &= ~PMACZILOG_FLAG_MODEM_STATUS;
+                }
+
+                /* Load registers to the chip */
+                pmz_maybe_update_regs(uap);
+        }
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        pmz_debug("pmz: set_termios() done.\n");
+}
+
+/* The port lock is not held.  */
+static void pmz_set_termios(struct uart_port *port, struct ktermios *termios,
+                            struct ktermios *old)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);  
+
+        /* Disable IRQs on the port */
+        uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+        write_zsreg(uap, R1, uap->curregs[R1]);
+
+        /* Setup new port configuration */
+        __pmz_set_termios(port, termios, old);
+
+        /* Re-enable IRQs on the port */
+        if (ZS_IS_OPEN(uap)) {
+                uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
+                if (!ZS_IS_EXTCLK(uap))
+                        uap->curregs[R1] |= EXT_INT_ENAB;
+                write_zsreg(uap, R1, uap->curregs[R1]);
+        }
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *pmz_type(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = to_pmz(port);
+
+        if (ZS_IS_IRDA(uap))
+                return "Z85c30 ESCC - Infrared port";
+        else if (ZS_IS_INTMODEM(uap))
+                return "Z85c30 ESCC - Internal modem";
+        return "Z85c30 ESCC - Serial port";
+}
+
+/* We do not request/release mappings of the registers here, this
+ * happens at early serial probe time.
+ */
+static void pmz_release_port(struct uart_port *port)
+{
+}
+
+static int pmz_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/* These do not need to do anything interesting either.  */
+static void pmz_config_port(struct uart_port *port, int flags)
+{
+}
+
+/* We do not support letting the user mess with the divisor, IRQ, etc. */
+static int pmz_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+
+static int pmz_poll_get_char(struct uart_port *port)
+{
+        struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
+
+        while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0)
+                udelay(5);
+        return read_zsdata(uap);
+}
+
+static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
+{
+        struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
+
+        /* Wait for the transmit buffer to empty. */
+        while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
+                udelay(5);
+        write_zsdata(uap, c);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+static struct uart_ops pmz_pops = {
+        .tx_empty       =       pmz_tx_empty,
+        .set_mctrl      =       pmz_set_mctrl,
+        .get_mctrl      =       pmz_get_mctrl,
+        .stop_tx        =       pmz_stop_tx,
+        .start_tx       =       pmz_start_tx,
+        .stop_rx        =       pmz_stop_rx,
+        .enable_ms      =       pmz_enable_ms,
+        .break_ctl      =       pmz_break_ctl,
+        .startup        =       pmz_startup,
+        .shutdown       =       pmz_shutdown,
+        .set_termios    =       pmz_set_termios,
+        .type           =       pmz_type,
+        .release_port   =       pmz_release_port,
+        .request_port   =       pmz_request_port,
+        .config_port    =       pmz_config_port,
+        .verify_port    =       pmz_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char  =       pmz_poll_get_char,
+        .poll_put_char  =       pmz_poll_put_char,
+#endif
+};
+
+#ifdef CONFIG_PPC_PMAC
+
+/*
+ * Setup one port structure after probing, HW is down at this point,
+ * Unlike sunzilog, we don't need to pre-init the spinlock as we don't
+ * register our console before uart_add_one_port() is called
+ */
+static int __init pmz_init_port(struct uart_pmac_port *uap)
+{
+        struct device_node *np = uap->node;
+        const char *conn;
+        const struct slot_names_prop {
+                int     count;
+                char    name[1];
+        } *slots;
+        int len;
+        struct resource r_ports, r_rxdma, r_txdma;
+
+        /*
+         * Request & map chip registers
+         */
+        if (of_address_to_resource(np, 0, &r_ports))
+                return -ENODEV;
+        uap->port.mapbase = r_ports.start;
+        uap->port.membase = ioremap(uap->port.mapbase, 0x1000);
+
+        uap->control_reg = uap->port.membase;
+        uap->data_reg = uap->control_reg + 0x10;
+        
+        /*
+         * Request & map DBDMA registers
+         */
+#ifdef HAS_DBDMA
+        if (of_address_to_resource(np, 1, &r_txdma) == 0 &&
+            of_address_to_resource(np, 2, &r_rxdma) == 0)
+                uap->flags |= PMACZILOG_FLAG_HAS_DMA;
+#else
+        memset(&r_txdma, 0, sizeof(struct resource));
+        memset(&r_rxdma, 0, sizeof(struct resource));
+#endif  
+        if (ZS_HAS_DMA(uap)) {
+                uap->tx_dma_regs = ioremap(r_txdma.start, 0x100);
+                if (uap->tx_dma_regs == NULL) { 
+                        uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
+                        goto no_dma;
+                }
+                uap->rx_dma_regs = ioremap(r_rxdma.start, 0x100);
+                if (uap->rx_dma_regs == NULL) { 
+                        iounmap(uap->tx_dma_regs);
+                        uap->tx_dma_regs = NULL;
+                        uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
+                        goto no_dma;
+                }
+                uap->tx_dma_irq = irq_of_parse_and_map(np, 1);
+                uap->rx_dma_irq = irq_of_parse_and_map(np, 2);
+        }
+no_dma:
+
+        /*
+         * Detect port type
+         */
+        if (of_device_is_compatible(np, "cobalt"))
+                uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
+        conn = of_get_property(np, "AAPL,connector", &len);
+        if (conn && (strcmp(conn, "infrared") == 0))
+                uap->flags |= PMACZILOG_FLAG_IS_IRDA;
+        uap->port_type = PMAC_SCC_ASYNC;
+        /* 1999 Powerbook G3 has slot-names property instead */
+        slots = of_get_property(np, "slot-names", &len);
+        if (slots && slots->count > 0) {
+                if (strcmp(slots->name, "IrDA") == 0)
+                        uap->flags |= PMACZILOG_FLAG_IS_IRDA;
+                else if (strcmp(slots->name, "Modem") == 0)
+                        uap->flags |= PMACZILOG_FLAG_IS_INTMODEM;
+        }
+        if (ZS_IS_IRDA(uap))
+                uap->port_type = PMAC_SCC_IRDA;
+        if (ZS_IS_INTMODEM(uap)) {
+                struct device_node* i2c_modem =
+                        of_find_node_by_name(NULL, "i2c-modem");
+                if (i2c_modem) {
+                        const char* mid =
+                                of_get_property(i2c_modem, "modem-id", NULL);
+                        if (mid) switch(*mid) {
+                        case 0x04 :
+                        case 0x05 :
+                        case 0x07 :
+                        case 0x08 :
+                        case 0x0b :
+                        case 0x0c :
+                                uap->port_type = PMAC_SCC_I2S1;
+                        }
+                        printk(KERN_INFO "pmac_zilog: i2c-modem detected, id: %d\n",
+                                mid ? (*mid) : 0);
+                        of_node_put(i2c_modem);
+                } else {
+                        printk(KERN_INFO "pmac_zilog: serial modem detected\n");
+                }
+        }
+
+        /*
+         * Init remaining bits of "port" structure
+         */
+        uap->port.iotype = UPIO_MEM;
+        uap->port.irq = irq_of_parse_and_map(np, 0);
+        uap->port.uartclk = ZS_CLOCK;
+        uap->port.fifosize = 1;
+        uap->port.ops = &pmz_pops;
+        uap->port.type = PORT_PMAC_ZILOG;
+        uap->port.flags = 0;
+
+        /*
+         * Fixup for the port on Gatwick for which the device-tree has
+         * missing interrupts. Normally, the macio_dev would contain
+         * fixed up interrupt info, but we use the device-tree directly
+         * here due to early probing so we need the fixup too.
+         */
+        if (uap->port.irq == NO_IRQ &&
+            np->parent && np->parent->parent &&
+            of_device_is_compatible(np->parent->parent, "gatwick")) {
+                /* IRQs on gatwick are offset by 64 */
+                uap->port.irq = irq_create_mapping(NULL, 64 + 15);
+                uap->tx_dma_irq = irq_create_mapping(NULL, 64 + 4);
+                uap->rx_dma_irq = irq_create_mapping(NULL, 64 + 5);
+        }
+
+        /* Setup some valid baud rate information in the register
+         * shadows so we don't write crap there before baud rate is
+         * first initialized.
+         */
+        pmz_convert_to_zs(uap, CS8, 0, 9600);
+
+        return 0;
+}
+
+/*
+ * Get rid of a port on module removal
+ */
+static void pmz_dispose_port(struct uart_pmac_port *uap)
+{
+        struct device_node *np;
+
+        np = uap->node;
+        iounmap(uap->rx_dma_regs);
+        iounmap(uap->tx_dma_regs);
+        iounmap(uap->control_reg);
+        uap->node = NULL;
+        of_node_put(np);
+        memset(uap, 0, sizeof(struct uart_pmac_port));
+}
+
+/*
+ * Called upon match with an escc node in the device-tree.
+ */
+static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match)
+{
+        int i;
+        
+        /* Iterate the pmz_ports array to find a matching entry
+         */
+        for (i = 0; i < MAX_ZS_PORTS; i++)
+                if (pmz_ports[i].node == mdev->ofdev.dev.of_node) {
+                        struct uart_pmac_port *uap = &pmz_ports[i];
+
+                        uap->dev = mdev;
+                        dev_set_drvdata(&mdev->ofdev.dev, uap);
+                        if (macio_request_resources(uap->dev, "pmac_zilog"))
+                                printk(KERN_WARNING "%s: Failed to request resource"
+                                       ", port still active\n",
+                                       uap->node->name);
+                        else
+                                uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;                            
+                        return 0;
+                }
+        return -ENODEV;
+}
+
+/*
+ * That one should not be called, macio isn't really a hotswap device,
+ * we don't expect one of those serial ports to go away...
+ */
+static int pmz_detach(struct macio_dev *mdev)
+{
+        struct uart_pmac_port   *uap = dev_get_drvdata(&mdev->ofdev.dev);
+        
+        if (!uap)
+                return -ENODEV;
+
+        if (uap->flags & PMACZILOG_FLAG_RSRC_REQUESTED) {
+                macio_release_resources(uap->dev);
+                uap->flags &= ~PMACZILOG_FLAG_RSRC_REQUESTED;
+        }
+        dev_set_drvdata(&mdev->ofdev.dev, NULL);
+        uap->dev = NULL;
+        
+        return 0;
+}
+
+
+static int pmz_suspend(struct macio_dev *mdev, pm_message_t pm_state)
+{
+        struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
+        struct uart_state *state;
+        unsigned long flags;
+
+        if (uap == NULL) {
+                printk("HRM... pmz_suspend with NULL uap\n");
+                return 0;
+        }
+
+        if (pm_state.event == mdev->ofdev.dev.power.power_state.event)
+                return 0;
+
+        pmz_debug("suspend, switching to state %d\n", pm_state.event);
+
+        state = pmz_uart_reg.state + uap->port.line;
+
+        mutex_lock(&pmz_irq_mutex);
+        mutex_lock(&state->port.mutex);
+
+        spin_lock_irqsave(&uap->port.lock, flags);
+
+        if (ZS_IS_OPEN(uap) || ZS_IS_CONS(uap)) {
+                /* Disable receiver and transmitter.  */
+                uap->curregs[R3] &= ~RxENABLE;
+                uap->curregs[R5] &= ~TxENABLE;
+
+                /* Disable all interrupts and BRK assertion.  */
+                uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+                uap->curregs[R5] &= ~SND_BRK;
+                pmz_load_zsregs(uap, uap->curregs);
+                uap->flags |= PMACZILOG_FLAG_IS_ASLEEP;
+                mb();
+        }
+
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+
+        if (ZS_IS_OPEN(uap) || ZS_IS_OPEN(uap->mate))
+                if (ZS_IS_ASLEEP(uap->mate) && ZS_IS_IRQ_ON(pmz_get_port_A(uap))) {
+                        pmz_get_port_A(uap)->flags &= ~PMACZILOG_FLAG_IS_IRQ_ON;
+                        disable_irq(uap->port.irq);
+                }
+
+        if (ZS_IS_CONS(uap))
+                uap->port.cons->flags &= ~CON_ENABLED;
+
+        /* Shut the chip down */
+        pmz_set_scc_power(uap, 0);
+
+        mutex_unlock(&state->port.mutex);
+        mutex_unlock(&pmz_irq_mutex);
+
+        pmz_debug("suspend, switching complete\n");
+
+        mdev->ofdev.dev.power.power_state = pm_state;
+
+        return 0;
+}
+
+
+static int pmz_resume(struct macio_dev *mdev)
+{
+        struct uart_pmac_port *uap = dev_get_drvdata(&mdev->ofdev.dev);
+        struct uart_state *state;
+        unsigned long flags;
+        int pwr_delay = 0;
+
+        if (uap == NULL)
+                return 0;
+
+        if (mdev->ofdev.dev.power.power_state.event == PM_EVENT_ON)
+                return 0;
+        
+        pmz_debug("resume, switching to state 0\n");
+
+        state = pmz_uart_reg.state + uap->port.line;
+
+        mutex_lock(&pmz_irq_mutex);
+        mutex_lock(&state->port.mutex);
+
+        spin_lock_irqsave(&uap->port.lock, flags);
+        if (!ZS_IS_OPEN(uap) && !ZS_IS_CONS(uap)) {
+                spin_unlock_irqrestore(&uap->port.lock, flags);
+                goto bail;
+        }
+        pwr_delay = __pmz_startup(uap);
+
+        /* Take care of config that may have changed while asleep */
+        __pmz_set_termios(&uap->port, &uap->termios_cache, NULL);
+
+        if (ZS_IS_OPEN(uap)) {
+                /* Enable interrupts */         
+                uap->curregs[R1] |= INT_ALL_Rx | TxINT_ENAB;
+                if (!ZS_IS_EXTCLK(uap))
+                        uap->curregs[R1] |= EXT_INT_ENAB;
+                write_zsreg(uap, R1, uap->curregs[R1]);
+        }
+
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+
+        if (ZS_IS_CONS(uap))
+                uap->port.cons->flags |= CON_ENABLED;
+
+        /* Re-enable IRQ on the controller */
+        if (ZS_IS_OPEN(uap) && !ZS_IS_IRQ_ON(pmz_get_port_A(uap))) {
+                pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON;
+                enable_irq(uap->port.irq);
+        }
+
+ bail:
+        mutex_unlock(&state->port.mutex);
+        mutex_unlock(&pmz_irq_mutex);
+
+        /* Right now, we deal with delay by blocking here, I'll be
+         * smarter later on
+         */
+        if (pwr_delay != 0) {
+                pmz_debug("pmz: delaying %d ms\n", pwr_delay);
+                msleep(pwr_delay);
+        }
+
+        pmz_debug("resume, switching complete\n");
+
+        mdev->ofdev.dev.power.power_state.event = PM_EVENT_ON;
+
+        return 0;
+}
+
+/*
+ * Probe all ports in the system and build the ports array, we register
+ * with the serial layer at this point, the macio-type probing is only
+ * used later to "attach" to the sysfs tree so we get power management
+ * events
+ */
+static int __init pmz_probe(void)
+{
+        struct device_node      *node_p, *node_a, *node_b, *np;
+        int                     count = 0;
+        int                     rc;
+
+        /*
+         * Find all escc chips in the system
+         */
+        node_p = of_find_node_by_name(NULL, "escc");
+        while (node_p) {
+                /*
+                 * First get channel A/B node pointers
+                 * 
+                 * TODO: Add routines with proper locking to do that...
+                 */
+                node_a = node_b = NULL;
+                for (np = NULL; (np = of_get_next_child(node_p, np)) != NULL;) {
+                        if (strncmp(np->name, "ch-a", 4) == 0)
+                                node_a = of_node_get(np);
+                        else if (strncmp(np->name, "ch-b", 4) == 0)
+                                node_b = of_node_get(np);
+                }
+                if (!node_a && !node_b) {
+                        of_node_put(node_a);
+                        of_node_put(node_b);
+                        printk(KERN_ERR "pmac_zilog: missing node %c for escc %s\n",
+                                (!node_a) ? 'a' : 'b', node_p->full_name);
+                        goto next;
+                }
+
+                /*
+                 * Fill basic fields in the port structures
+                 */
+                pmz_ports[count].mate           = &pmz_ports[count+1];
+                pmz_ports[count+1].mate         = &pmz_ports[count];
+                pmz_ports[count].flags          = PMACZILOG_FLAG_IS_CHANNEL_A;
+                pmz_ports[count].node           = node_a;
+                pmz_ports[count+1].node         = node_b;
+                pmz_ports[count].port.line      = count;
+                pmz_ports[count+1].port.line    = count+1;
+
+                /*
+                 * Setup the ports for real
+                 */
+                rc = pmz_init_port(&pmz_ports[count]);
+                if (rc == 0 && node_b != NULL)
+                        rc = pmz_init_port(&pmz_ports[count+1]);
+                if (rc != 0) {
+                        of_node_put(node_a);
+                        of_node_put(node_b);
+                        memset(&pmz_ports[count], 0, sizeof(struct uart_pmac_port));
+                        memset(&pmz_ports[count+1], 0, sizeof(struct uart_pmac_port));
+                        goto next;
+                }
+                count += 2;
+next:
+                node_p = of_find_node_by_name(node_p, "escc");
+        }
+        pmz_ports_count = count;
+
+        return 0;
+}
+
+#else
+
+extern struct platform_device scc_a_pdev, scc_b_pdev;
+
+static int __init pmz_init_port(struct uart_pmac_port *uap)
+{
+        struct resource *r_ports;
+        int irq;
+
+        r_ports = platform_get_resource(uap->node, IORESOURCE_MEM, 0);
+        irq = platform_get_irq(uap->node, 0);
+        if (!r_ports || !irq)
+                return -ENODEV;
+
+        uap->port.mapbase  = r_ports->start;
+        uap->port.membase  = (unsigned char __iomem *) r_ports->start;
+        uap->port.iotype   = UPIO_MEM;
+        uap->port.irq      = irq;
+        uap->port.uartclk  = ZS_CLOCK;
+        uap->port.fifosize = 1;
+        uap->port.ops      = &pmz_pops;
+        uap->port.type     = PORT_PMAC_ZILOG;
+        uap->port.flags    = 0;
+
+        uap->control_reg   = uap->port.membase;
+        uap->data_reg      = uap->control_reg + 4;
+        uap->port_type     = 0;
+
+        pmz_convert_to_zs(uap, CS8, 0, 9600);
+
+        return 0;
+}
+
+static int __init pmz_probe(void)
+{
+        int err;
+
+        pmz_ports_count = 0;
+
+        pmz_ports[0].mate      = &pmz_ports[1];
+        pmz_ports[0].port.line = 0;
+        pmz_ports[0].flags     = PMACZILOG_FLAG_IS_CHANNEL_A;
+        pmz_ports[0].node      = &scc_a_pdev;
+        err = pmz_init_port(&pmz_ports[0]);
+        if (err)
+                return err;
+        pmz_ports_count++;
+
+        pmz_ports[1].mate      = &pmz_ports[0];
+        pmz_ports[1].port.line = 1;
+        pmz_ports[1].flags     = 0;
+        pmz_ports[1].node      = &scc_b_pdev;
+        err = pmz_init_port(&pmz_ports[1]);
+        if (err)
+                return err;
+        pmz_ports_count++;
+
+        return 0;
+}
+
+static void pmz_dispose_port(struct uart_pmac_port *uap)
+{
+        memset(uap, 0, sizeof(struct uart_pmac_port));
+}
+
+static int __init pmz_attach(struct platform_device *pdev)
+{
+        int i;
+
+        for (i = 0; i < pmz_ports_count; i++)
+                if (pmz_ports[i].node == pdev)
+                        return 0;
+        return -ENODEV;
+}
+
+static int __exit pmz_detach(struct platform_device *pdev)
+{
+        return 0;
+}
+
+#endif /* !CONFIG_PPC_PMAC */
+
+#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
+
+static void pmz_console_write(struct console *con, const char *s, unsigned int count);
+static int __init pmz_console_setup(struct console *co, char *options);
+
+static struct console pmz_console = {
+        .name   =       PMACZILOG_NAME,
+        .write  =       pmz_console_write,
+        .device =       uart_console_device,
+        .setup  =       pmz_console_setup,
+        .flags  =       CON_PRINTBUFFER,
+        .index  =       -1,
+        .data   =       &pmz_uart_reg,
+};
+
+#define PMACZILOG_CONSOLE       &pmz_console
+#else /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+#define PMACZILOG_CONSOLE       (NULL)
+#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+
+/*
+ * Register the driver, console driver and ports with the serial
+ * core
+ */
+static int __init pmz_register(void)
+{
+        int i, rc;
+        
+        pmz_uart_reg.nr = pmz_ports_count;
+        pmz_uart_reg.cons = PMACZILOG_CONSOLE;
+
+        /*
+         * Register this driver with the serial core
+         */
+        rc = uart_register_driver(&pmz_uart_reg);
+        if (rc)
+                return rc;
+
+        /*
+         * Register each port with the serial core
+         */
+        for (i = 0; i < pmz_ports_count; i++) {
+                struct uart_pmac_port *uport = &pmz_ports[i];
+                /* NULL node may happen on wallstreet */
+                if (uport->node != NULL)
+                        rc = uart_add_one_port(&pmz_uart_reg, &uport->port);
+                if (rc)
+                        goto err_out;
+        }
+
+        return 0;
+err_out:
+        while (i-- > 0) {
+                struct uart_pmac_port *uport = &pmz_ports[i];
+                uart_remove_one_port(&pmz_uart_reg, &uport->port);
+        }
+        uart_unregister_driver(&pmz_uart_reg);
+        return rc;
+}
+
+#ifdef CONFIG_PPC_PMAC
+
+static struct of_device_id pmz_match[] = 
+{
+        {
+        .name           = "ch-a",
+        },
+        {
+        .name           = "ch-b",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE (of, pmz_match);
+
+static struct macio_driver pmz_driver = {
+        .driver = {
+                .name           = "pmac_zilog",
+                .owner          = THIS_MODULE,
+                .of_match_table = pmz_match,
+        },
+        .probe          = pmz_attach,
+        .remove         = pmz_detach,
+        .suspend        = pmz_suspend,
+        .resume         = pmz_resume,
+};
+
+#else
+
+static struct platform_driver pmz_driver = {
+        .remove         = __exit_p(pmz_detach),
+        .driver         = {
+                .name           = "scc",
+                .owner          = THIS_MODULE,
+        },
+};
+
+#endif /* !CONFIG_PPC_PMAC */
+
+static int __init init_pmz(void)
+{
+        int rc, i;
+        printk(KERN_INFO "%s\n", version);
+
+        /* 
+         * First, we need to do a direct OF-based probe pass. We
+         * do that because we want serial console up before the
+         * macio stuffs calls us back, and since that makes it
+         * easier to pass the proper number of channels to
+         * uart_register_driver()
+         */
+        if (pmz_ports_count == 0)
+                pmz_probe();
+
+        /*
+         * Bail early if no port found
+         */
+        if (pmz_ports_count == 0)
+                return -ENODEV;
+
+        /*
+         * Now we register with the serial layer
+         */
+        rc = pmz_register();
+        if (rc) {
+                printk(KERN_ERR 
+                        "pmac_zilog: Error registering serial device, disabling pmac_zilog.\n"
+                        "pmac_zilog: Did another serial driver already claim the minors?\n"); 
+                /* effectively "pmz_unprobe()" */
+                for (i=0; i < pmz_ports_count; i++)
+                        pmz_dispose_port(&pmz_ports[i]);
+                return rc;
+        }
+
+        /*
+         * Then we register the macio driver itself
+         */
+#ifdef CONFIG_PPC_PMAC
+        return macio_register_driver(&pmz_driver);
+#else
+        return platform_driver_probe(&pmz_driver, pmz_attach);
+#endif
+}
+
+static void __exit exit_pmz(void)
+{
+        int i;
+
+#ifdef CONFIG_PPC_PMAC
+        /* Get rid of macio-driver (detach from macio) */
+        macio_unregister_driver(&pmz_driver);
+#else
+        platform_driver_unregister(&pmz_driver);
+#endif
+
+        for (i = 0; i < pmz_ports_count; i++) {
+                struct uart_pmac_port *uport = &pmz_ports[i];
+                if (uport->node != NULL) {
+                        uart_remove_one_port(&pmz_uart_reg, &uport->port);
+                        pmz_dispose_port(uport);
+                }
+        }
+        /* Unregister UART driver */
+        uart_unregister_driver(&pmz_uart_reg);
+}
+
+#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
+
+static void pmz_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
+
+        /* Wait for the transmit buffer to empty. */
+        while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0)
+                udelay(5);
+        write_zsdata(uap, ch);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ */
+static void pmz_console_write(struct console *con, const char *s, unsigned int count)
+{
+        struct uart_pmac_port *uap = &pmz_ports[con->index];
+        unsigned long flags;
+
+        if (ZS_IS_ASLEEP(uap))
+                return;
+        spin_lock_irqsave(&uap->port.lock, flags);
+
+        /* Turn of interrupts and enable the transmitter. */
+        write_zsreg(uap, R1, uap->curregs[1] & ~TxINT_ENAB);
+        write_zsreg(uap, R5, uap->curregs[5] | TxENABLE | RTS | DTR);
+
+        uart_console_write(&uap->port, s, count, pmz_console_putchar);
+
+        /* Restore the values in the registers. */
+        write_zsreg(uap, R1, uap->curregs[1]);
+        /* Don't disable the transmitter. */
+
+        spin_unlock_irqrestore(&uap->port.lock, flags);
+}
+
+/*
+ * Setup the serial console
+ */
+static int __init pmz_console_setup(struct console *co, char *options)
+{
+        struct uart_pmac_port *uap;
+        struct uart_port *port;
+        int baud = 38400;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        unsigned long pwr_delay;
+
+        /*
+         * XServe's default to 57600 bps
+         */
+        if (of_machine_is_compatible("RackMac1,1")
+            || of_machine_is_compatible("RackMac1,2")
+            || of_machine_is_compatible("MacRISC4"))
+                baud = 57600;
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= pmz_ports_count)
+                co->index = 0;
+        uap = &pmz_ports[co->index];
+        if (uap->node == NULL)
+                return -ENODEV;
+        port = &uap->port;
+
+        /*
+         * Mark port as beeing a console
+         */
+        uap->flags |= PMACZILOG_FLAG_IS_CONS;
+
+        /*
+         * Temporary fix for uart layer who didn't setup the spinlock yet
+         */
+        spin_lock_init(&port->lock);
+
+        /*
+         * Enable the hardware
+         */
+        pwr_delay = __pmz_startup(uap);
+        if (pwr_delay)
+                mdelay(pwr_delay);
+        
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static int __init pmz_console_init(void)
+{
+        /* Probe ports */
+        pmz_probe();
+
+        /* TODO: Autoprobe console based on OF */
+        /* pmz_console.index = i; */
+        register_console(&pmz_console);
+
+        return 0;
+
+}
+console_initcall(pmz_console_init);
+#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
+
+module_init(init_pmz);
+module_exit(exit_pmz);
diff --git a/drivers/tty/serial/pmac_zilog.h b/drivers/tty/serial/pmac_zilog.h
new file mode 100644
index 000000000000..cbc34fbb1b20
--- /dev/null
+++ b/drivers/tty/serial/pmac_zilog.h
@@ -0,0 +1,396 @@
+#ifndef __PMAC_ZILOG_H__
+#define __PMAC_ZILOG_H__
+
+#ifdef CONFIG_PPC_PMAC
+#define pmz_debug(fmt, arg...)  dev_dbg(&uap->dev->ofdev.dev, fmt, ## arg)
+#define pmz_error(fmt, arg...)  dev_err(&uap->dev->ofdev.dev, fmt, ## arg)
+#define pmz_info(fmt, arg...)   dev_info(&uap->dev->ofdev.dev, fmt, ## arg)
+#else
+#define pmz_debug(fmt, arg...)  dev_dbg(&uap->node->dev, fmt, ## arg)
+#define pmz_error(fmt, arg...)  dev_err(&uap->node->dev, fmt, ## arg)
+#define pmz_info(fmt, arg...)   dev_info(&uap->node->dev, fmt, ## arg)
+#endif
+
+/*
+ * At most 2 ESCCs with 2 ports each
+ */
+#define MAX_ZS_PORTS    4
+
+/* 
+ * We wrap our port structure around the generic uart_port.
+ */
+#define NUM_ZSREGS    17
+
+struct uart_pmac_port {
+        struct uart_port                port;
+        struct uart_pmac_port           *mate;
+
+#ifdef CONFIG_PPC_PMAC
+        /* macio_dev for the escc holding this port (maybe be null on
+         * early inited port)
+         */
+        struct macio_dev                *dev;
+        /* device node to this port, this points to one of 2 childs
+         * of "escc" node (ie. ch-a or ch-b)
+         */
+        struct device_node              *node;
+#else
+        struct platform_device          *node;
+#endif
+
+        /* Port type as obtained from device tree (IRDA, modem, ...) */
+        int                             port_type;
+        u8                              curregs[NUM_ZSREGS];
+
+        unsigned int                    flags;
+#define PMACZILOG_FLAG_IS_CONS          0x00000001
+#define PMACZILOG_FLAG_IS_KGDB          0x00000002
+#define PMACZILOG_FLAG_MODEM_STATUS     0x00000004
+#define PMACZILOG_FLAG_IS_CHANNEL_A     0x00000008
+#define PMACZILOG_FLAG_REGS_HELD        0x00000010
+#define PMACZILOG_FLAG_TX_STOPPED       0x00000020
+#define PMACZILOG_FLAG_TX_ACTIVE        0x00000040
+#define PMACZILOG_FLAG_ENABLED          0x00000080
+#define PMACZILOG_FLAG_IS_IRDA          0x00000100
+#define PMACZILOG_FLAG_IS_INTMODEM      0x00000200
+#define PMACZILOG_FLAG_HAS_DMA          0x00000400
+#define PMACZILOG_FLAG_RSRC_REQUESTED   0x00000800
+#define PMACZILOG_FLAG_IS_ASLEEP        0x00001000
+#define PMACZILOG_FLAG_IS_OPEN          0x00002000
+#define PMACZILOG_FLAG_IS_IRQ_ON        0x00004000
+#define PMACZILOG_FLAG_IS_EXTCLK        0x00008000
+#define PMACZILOG_FLAG_BREAK            0x00010000
+
+        unsigned char                   parity_mask;
+        unsigned char                   prev_status;
+
+        volatile u8                     __iomem *control_reg;
+        volatile u8                     __iomem *data_reg;
+
+#ifdef CONFIG_PPC_PMAC
+        unsigned int                    tx_dma_irq;
+        unsigned int                    rx_dma_irq;
+        volatile struct dbdma_regs      __iomem *tx_dma_regs;
+        volatile struct dbdma_regs      __iomem *rx_dma_regs;
+#endif
+
+        struct ktermios                 termios_cache;
+};
+
+#define to_pmz(p) ((struct uart_pmac_port *)(p))
+
+static inline struct uart_pmac_port *pmz_get_port_A(struct uart_pmac_port *uap)
+{
+        if (uap->flags & PMACZILOG_FLAG_IS_CHANNEL_A)
+                return uap;
+        return uap->mate;
+}
+
+/*
+ * Register accessors. Note that we don't need to enforce a recovery
+ * delay on PCI PowerMac hardware, it's dealt in HW by the MacIO chip,
+ * though if we try to use this driver on older machines, we might have
+ * to add it back
+ */
+static inline u8 read_zsreg(struct uart_pmac_port *port, u8 reg)
+{
+        if (reg != 0)
+                writeb(reg, port->control_reg);
+        return readb(port->control_reg);
+}
+
+static inline void write_zsreg(struct uart_pmac_port *port, u8 reg, u8 value)
+{
+        if (reg != 0)
+                writeb(reg, port->control_reg);
+        writeb(value, port->control_reg);
+}
+
+static inline u8 read_zsdata(struct uart_pmac_port *port)
+{
+        return readb(port->data_reg);
+}
+
+static inline void write_zsdata(struct uart_pmac_port *port, u8 data)
+{
+        writeb(data, port->data_reg);
+}
+
+static inline void zssync(struct uart_pmac_port *port)
+{
+        (void)readb(port->control_reg);
+}
+
+/* Conversion routines to/from brg time constants from/to bits
+ * per second.
+ */
+#define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
+#define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
+
+#define ZS_CLOCK         3686400        /* Z8530 RTxC input clock rate */
+
+/* The Zilog register set */
+
+#define FLAG    0x7e
+
+/* Write Register 0 */
+#define R0      0               /* Register selects */
+#define R1      1
+#define R2      2
+#define R3      3
+#define R4      4
+#define R5      5
+#define R6      6
+#define R7      7
+#define R8      8
+#define R9      9
+#define R10     10
+#define R11     11
+#define R12     12
+#define R13     13
+#define R14     14
+#define R15     15
+#define R7P     16
+
+#define NULLCODE        0       /* Null Code */
+#define POINT_HIGH      0x8     /* Select upper half of registers */
+#define RES_EXT_INT     0x10    /* Reset Ext. Status Interrupts */
+#define SEND_ABORT      0x18    /* HDLC Abort */
+#define RES_RxINT_FC    0x20    /* Reset RxINT on First Character */
+#define RES_Tx_P        0x28    /* Reset TxINT Pending */
+#define ERR_RES         0x30    /* Error Reset */
+#define RES_H_IUS       0x38    /* Reset highest IUS */
+
+#define RES_Rx_CRC      0x40    /* Reset Rx CRC Checker */
+#define RES_Tx_CRC      0x80    /* Reset Tx CRC Checker */
+#define RES_EOM_L       0xC0    /* Reset EOM latch */
+
+/* Write Register 1 */
+
+#define EXT_INT_ENAB    0x1     /* Ext Int Enable */
+#define TxINT_ENAB      0x2     /* Tx Int Enable */
+#define PAR_SPEC        0x4     /* Parity is special condition */
+
+#define RxINT_DISAB     0       /* Rx Int Disable */
+#define RxINT_FCERR     0x8     /* Rx Int on First Character Only or Error */
+#define INT_ALL_Rx      0x10    /* Int on all Rx Characters or error */
+#define INT_ERR_Rx      0x18    /* Int on error only */
+#define RxINT_MASK      0x18
+
+#define WT_RDY_RT       0x20    /* W/Req reflects recv if 1, xmit if 0 */
+#define WT_FN_RDYFN     0x40    /* W/Req pin is DMA request if 1, wait if 0 */
+#define WT_RDY_ENAB     0x80    /* Enable W/Req pin */
+
+/* Write Register #2 (Interrupt Vector) */
+
+/* Write Register 3 */
+
+#define RxENABLE        0x1     /* Rx Enable */
+#define SYNC_L_INH      0x2     /* Sync Character Load Inhibit */
+#define ADD_SM          0x4     /* Address Search Mode (SDLC) */
+#define RxCRC_ENAB      0x8     /* Rx CRC Enable */
+#define ENT_HM          0x10    /* Enter Hunt Mode */
+#define AUTO_ENAB       0x20    /* Auto Enables */
+#define Rx5             0x0     /* Rx 5 Bits/Character */
+#define Rx7             0x40    /* Rx 7 Bits/Character */
+#define Rx6             0x80    /* Rx 6 Bits/Character */
+#define Rx8             0xc0    /* Rx 8 Bits/Character */
+#define RxN_MASK        0xc0
+
+/* Write Register 4 */
+
+#define PAR_ENAB        0x1     /* Parity Enable */
+#define PAR_EVEN        0x2     /* Parity Even/Odd* */
+
+#define SYNC_ENAB       0       /* Sync Modes Enable */
+#define SB1             0x4     /* 1 stop bit/char */
+#define SB15            0x8     /* 1.5 stop bits/char */
+#define SB2             0xc     /* 2 stop bits/char */
+#define SB_MASK         0xc
+
+#define MONSYNC         0       /* 8 Bit Sync character */
+#define BISYNC          0x10    /* 16 bit sync character */
+#define SDLC            0x20    /* SDLC Mode (01111110 Sync Flag) */
+#define EXTSYNC         0x30    /* External Sync Mode */
+
+#define X1CLK           0x0     /* x1 clock mode */
+#define X16CLK          0x40    /* x16 clock mode */
+#define X32CLK          0x80    /* x32 clock mode */
+#define X64CLK          0xC0    /* x64 clock mode */
+#define XCLK_MASK       0xC0
+
+/* Write Register 5 */
+
+#define TxCRC_ENAB      0x1     /* Tx CRC Enable */
+#define RTS             0x2     /* RTS */
+#define SDLC_CRC        0x4     /* SDLC/CRC-16 */
+#define TxENABLE        0x8     /* Tx Enable */
+#define SND_BRK         0x10    /* Send Break */
+#define Tx5             0x0     /* Tx 5 bits (or less)/character */
+#define Tx7             0x20    /* Tx 7 bits/character */
+#define Tx6             0x40    /* Tx 6 bits/character */
+#define Tx8             0x60    /* Tx 8 bits/character */
+#define TxN_MASK        0x60
+#define DTR             0x80    /* DTR */
+
+/* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
+
+/* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
+
+/* Write Register 7' (Some enhanced feature control) */
+#define ENEXREAD        0x40    /* Enable read of some write registers */
+
+/* Write Register 8 (transmit buffer) */
+
+/* Write Register 9 (Master interrupt control) */
+#define VIS     1       /* Vector Includes Status */
+#define NV      2       /* No Vector */
+#define DLC     4       /* Disable Lower Chain */
+#define MIE     8       /* Master Interrupt Enable */
+#define STATHI  0x10    /* Status high */
+#define NORESET 0       /* No reset on write to R9 */
+#define CHRB    0x40    /* Reset channel B */
+#define CHRA    0x80    /* Reset channel A */
+#define FHWRES  0xc0    /* Force hardware reset */
+
+/* Write Register 10 (misc control bits) */
+#define BIT6    1       /* 6 bit/8bit sync */
+#define LOOPMODE 2      /* SDLC Loop mode */
+#define ABUNDER 4       /* Abort/flag on SDLC xmit underrun */
+#define MARKIDLE 8      /* Mark/flag on idle */
+#define GAOP    0x10    /* Go active on poll */
+#define NRZ     0       /* NRZ mode */
+#define NRZI    0x20    /* NRZI mode */
+#define FM1     0x40    /* FM1 (transition = 1) */
+#define FM0     0x60    /* FM0 (transition = 0) */
+#define CRCPS   0x80    /* CRC Preset I/O */
+
+/* Write Register 11 (Clock Mode control) */
+#define TRxCXT  0       /* TRxC = Xtal output */
+#define TRxCTC  1       /* TRxC = Transmit clock */
+#define TRxCBR  2       /* TRxC = BR Generator Output */
+#define TRxCDP  3       /* TRxC = DPLL output */
+#define TRxCOI  4       /* TRxC O/I */
+#define TCRTxCP 0       /* Transmit clock = RTxC pin */
+#define TCTRxCP 8       /* Transmit clock = TRxC pin */
+#define TCBR    0x10    /* Transmit clock = BR Generator output */
+#define TCDPLL  0x18    /* Transmit clock = DPLL output */
+#define RCRTxCP 0       /* Receive clock = RTxC pin */
+#define RCTRxCP 0x20    /* Receive clock = TRxC pin */
+#define RCBR    0x40    /* Receive clock = BR Generator output */
+#define RCDPLL  0x60    /* Receive clock = DPLL output */
+#define RTxCX   0x80    /* RTxC Xtal/No Xtal */
+
+/* Write Register 12 (lower byte of baud rate generator time constant) */
+
+/* Write Register 13 (upper byte of baud rate generator time constant) */
+
+/* Write Register 14 (Misc control bits) */
+#define BRENAB  1       /* Baud rate generator enable */
+#define BRSRC   2       /* Baud rate generator source */
+#define DTRREQ  4       /* DTR/Request function */
+#define AUTOECHO 8      /* Auto Echo */
+#define LOOPBAK 0x10    /* Local loopback */
+#define SEARCH  0x20    /* Enter search mode */
+#define RMC     0x40    /* Reset missing clock */
+#define DISDPLL 0x60    /* Disable DPLL */
+#define SSBR    0x80    /* Set DPLL source = BR generator */
+#define SSRTxC  0xa0    /* Set DPLL source = RTxC */
+#define SFMM    0xc0    /* Set FM mode */
+#define SNRZI   0xe0    /* Set NRZI mode */
+
+/* Write Register 15 (external/status interrupt control) */
+#define EN85C30 1       /* Enable some 85c30-enhanced registers */
+#define ZCIE    2       /* Zero count IE */
+#define ENSTFIFO 4      /* Enable status FIFO (SDLC) */
+#define DCDIE   8       /* DCD IE */
+#define SYNCIE  0x10    /* Sync/hunt IE */
+#define CTSIE   0x20    /* CTS IE */
+#define TxUIE   0x40    /* Tx Underrun/EOM IE */
+#define BRKIE   0x80    /* Break/Abort IE */
+
+
+/* Read Register 0 */
+#define Rx_CH_AV        0x1     /* Rx Character Available */
+#define ZCOUNT          0x2     /* Zero count */
+#define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
+#define DCD             0x8     /* DCD */
+#define SYNC_HUNT       0x10    /* Sync/hunt */
+#define CTS             0x20    /* CTS */
+#define TxEOM           0x40    /* Tx underrun */
+#define BRK_ABRT        0x80    /* Break/Abort */
+
+/* Read Register 1 */
+#define ALL_SNT         0x1     /* All sent */
+/* Residue Data for 8 Rx bits/char programmed */
+#define RES3            0x8     /* 0/3 */
+#define RES4            0x4     /* 0/4 */
+#define RES5            0xc     /* 0/5 */
+#define RES6            0x2     /* 0/6 */
+#define RES7            0xa     /* 0/7 */
+#define RES8            0x6     /* 0/8 */
+#define RES18           0xe     /* 1/8 */
+#define RES28           0x0     /* 2/8 */
+/* Special Rx Condition Interrupts */
+#define PAR_ERR         0x10    /* Parity error */
+#define Rx_OVR          0x20    /* Rx Overrun Error */
+#define CRC_ERR         0x40    /* CRC/Framing Error */
+#define END_FR          0x80    /* End of Frame (SDLC) */
+
+/* Read Register 2 (channel b only) - Interrupt vector */
+#define CHB_Tx_EMPTY    0x00
+#define CHB_EXT_STAT    0x02
+#define CHB_Rx_AVAIL    0x04
+#define CHB_SPECIAL     0x06
+#define CHA_Tx_EMPTY    0x08
+#define CHA_EXT_STAT    0x0a
+#define CHA_Rx_AVAIL    0x0c
+#define CHA_SPECIAL     0x0e
+#define STATUS_MASK     0x06
+
+/* Read Register 3 (interrupt pending register) ch a only */
+#define CHBEXT  0x1             /* Channel B Ext/Stat IP */
+#define CHBTxIP 0x2             /* Channel B Tx IP */
+#define CHBRxIP 0x4             /* Channel B Rx IP */
+#define CHAEXT  0x8             /* Channel A Ext/Stat IP */
+#define CHATxIP 0x10            /* Channel A Tx IP */
+#define CHARxIP 0x20            /* Channel A Rx IP */
+
+/* Read Register 8 (receive data register) */
+
+/* Read Register 10  (misc status bits) */
+#define ONLOOP  2               /* On loop */
+#define LOOPSEND 0x10           /* Loop sending */
+#define CLK2MIS 0x40            /* Two clocks missing */
+#define CLK1MIS 0x80            /* One clock missing */
+
+/* Read Register 12 (lower byte of baud rate generator constant) */
+
+/* Read Register 13 (upper byte of baud rate generator constant) */
+
+/* Read Register 15 (value of WR 15) */
+
+/* Misc macros */
+#define ZS_CLEARERR(port)    (write_zsreg(port, 0, ERR_RES))
+#define ZS_CLEARFIFO(port)   do { volatile unsigned char garbage; \
+                                     garbage = read_zsdata(port); \
+                                     garbage = read_zsdata(port); \
+                                     garbage = read_zsdata(port); \
+                                } while(0)
+
+#define ZS_IS_CONS(UP)                  ((UP)->flags & PMACZILOG_FLAG_IS_CONS)
+#define ZS_IS_KGDB(UP)                  ((UP)->flags & PMACZILOG_FLAG_IS_KGDB)
+#define ZS_IS_CHANNEL_A(UP)             ((UP)->flags & PMACZILOG_FLAG_IS_CHANNEL_A)
+#define ZS_REGS_HELD(UP)                ((UP)->flags & PMACZILOG_FLAG_REGS_HELD)
+#define ZS_TX_STOPPED(UP)               ((UP)->flags & PMACZILOG_FLAG_TX_STOPPED)
+#define ZS_TX_ACTIVE(UP)                ((UP)->flags & PMACZILOG_FLAG_TX_ACTIVE)
+#define ZS_WANTS_MODEM_STATUS(UP)       ((UP)->flags & PMACZILOG_FLAG_MODEM_STATUS)
+#define ZS_IS_IRDA(UP)                  ((UP)->flags & PMACZILOG_FLAG_IS_IRDA)
+#define ZS_IS_INTMODEM(UP)              ((UP)->flags & PMACZILOG_FLAG_IS_INTMODEM)
+#define ZS_HAS_DMA(UP)                  ((UP)->flags & PMACZILOG_FLAG_HAS_DMA)
+#define ZS_IS_ASLEEP(UP)                ((UP)->flags & PMACZILOG_FLAG_IS_ASLEEP)
+#define ZS_IS_OPEN(UP)                  ((UP)->flags & PMACZILOG_FLAG_IS_OPEN)
+#define ZS_IS_IRQ_ON(UP)                ((UP)->flags & PMACZILOG_FLAG_IS_IRQ_ON)
+#define ZS_IS_EXTCLK(UP)                ((UP)->flags & PMACZILOG_FLAG_IS_EXTCLK)
+
+#endif /* __PMAC_ZILOG_H__ */
diff --git a/drivers/tty/serial/pnx8xxx_uart.c b/drivers/tty/serial/pnx8xxx_uart.c
new file mode 100644
index 000000000000..0aa75a97531c
--- /dev/null
+++ b/drivers/tty/serial/pnx8xxx_uart.c
@@ -0,0 +1,854 @@
+/*
+ * UART driver for PNX8XXX SoCs
+ *
+ * Author: Per Hallsmark per.hallsmark@mvista.com
+ * Ported to 2.6 kernel by EmbeddedAlley
+ * Reworked by Vitaly Wool <vitalywool@gmail.com>
+ *
+ * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ * Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of
+ * any kind, whether express or implied.
+ *
+ */
+
+#if defined(CONFIG_SERIAL_PNX8XXX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/serial_pnx8xxx.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+/* We'll be using StrongARM sa1100 serial port major/minor */
+#define SERIAL_PNX8XXX_MAJOR    204
+#define MINOR_START             5
+
+#define NR_PORTS                2
+
+#define PNX8XXX_ISR_PASS_LIMIT  256
+
+/*
+ * Convert from ignore_status_mask or read_status_mask to FIFO
+ * and interrupt status bits
+ */
+#define SM_TO_FIFO(x)   ((x) >> 10)
+#define SM_TO_ISTAT(x)  ((x) & 0x000001ff)
+#define FIFO_TO_SM(x)   ((x) << 10)
+#define ISTAT_TO_SM(x)  ((x) & 0x000001ff)
+
+/*
+ * This is the size of our serial port register set.
+ */
+#define UART_PORT_SIZE  0x1000
+
+/*
+ * This determines how often we check the modem status signals
+ * for any change.  They generally aren't connected to an IRQ
+ * so we have to poll them.  We also check immediately before
+ * filling the TX fifo incase CTS has been dropped.
+ */
+#define MCTRL_TIMEOUT   (250*HZ/1000)
+
+extern struct pnx8xxx_port pnx8xxx_ports[];
+
+static inline int serial_in(struct pnx8xxx_port *sport, int offset)
+{
+        return (__raw_readl(sport->port.membase + offset));
+}
+
+static inline void serial_out(struct pnx8xxx_port *sport, int offset, int value)
+{
+        __raw_writel(value, sport->port.membase + offset);
+}
+
+/*
+ * Handle any change of modem status signal since we were last called.
+ */
+static void pnx8xxx_mctrl_check(struct pnx8xxx_port *sport)
+{
+        unsigned int status, changed;
+
+        status = sport->port.ops->get_mctrl(&sport->port);
+        changed = status ^ sport->old_status;
+
+        if (changed == 0)
+                return;
+
+        sport->old_status = status;
+
+        if (changed & TIOCM_RI)
+                sport->port.icount.rng++;
+        if (changed & TIOCM_DSR)
+                sport->port.icount.dsr++;
+        if (changed & TIOCM_CAR)
+                uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
+        if (changed & TIOCM_CTS)
+                uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
+
+        wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
+}
+
+/*
+ * This is our per-port timeout handler, for checking the
+ * modem status signals.
+ */
+static void pnx8xxx_timeout(unsigned long data)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)data;
+        unsigned long flags;
+
+        if (sport->port.state) {
+                spin_lock_irqsave(&sport->port.lock, flags);
+                pnx8xxx_mctrl_check(sport);
+                spin_unlock_irqrestore(&sport->port.lock, flags);
+
+                mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
+        }
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void pnx8xxx_stop_tx(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        u32 ien;
+
+        /* Disable TX intr */
+        ien = serial_in(sport, PNX8XXX_IEN);
+        serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLTX);
+
+        /* Clear all pending TX intr */
+        serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
+}
+
+/*
+ * interrupts may not be disabled on entry
+ */
+static void pnx8xxx_start_tx(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        u32 ien;
+
+        /* Clear all pending TX intr */
+        serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
+
+        /* Enable TX intr */
+        ien = serial_in(sport, PNX8XXX_IEN);
+        serial_out(sport, PNX8XXX_IEN, ien | PNX8XXX_UART_INT_ALLTX);
+}
+
+/*
+ * Interrupts enabled
+ */
+static void pnx8xxx_stop_rx(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        u32 ien;
+
+        /* Disable RX intr */
+        ien = serial_in(sport, PNX8XXX_IEN);
+        serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLRX);
+
+        /* Clear all pending RX intr */
+        serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX);
+}
+
+/*
+ * Set the modem control timer to fire immediately.
+ */
+static void pnx8xxx_enable_ms(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+
+        mod_timer(&sport->timer, jiffies);
+}
+
+static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
+{
+        struct tty_struct *tty = sport->port.state->port.tty;
+        unsigned int status, ch, flg;
+
+        status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
+                 ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
+        while (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFIFO)) {
+                ch = serial_in(sport, PNX8XXX_FIFO) & 0xff;
+
+                sport->port.icount.rx++;
+
+                flg = TTY_NORMAL;
+
+                /*
+                 * note that the error handling code is
+                 * out of the main execution path
+                 */
+                if (status & (FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE |
+                                        PNX8XXX_UART_FIFO_RXPAR |
+                                        PNX8XXX_UART_FIFO_RXBRK) |
+                              ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))) {
+                        if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXBRK)) {
+                                status &= ~(FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
+                                        FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR));
+                                sport->port.icount.brk++;
+                                if (uart_handle_break(&sport->port))
+                                        goto ignore_char;
+                        } else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
+                                sport->port.icount.parity++;
+                        else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
+                                sport->port.icount.frame++;
+                        if (status & ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))
+                                sport->port.icount.overrun++;
+
+                        status &= sport->port.read_status_mask;
+
+                        if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
+                                flg = TTY_PARITY;
+                        else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
+                                flg = TTY_FRAME;
+
+#ifdef SUPPORT_SYSRQ
+                        sport->port.sysrq = 0;
+#endif
+                }
+
+                if (uart_handle_sysrq_char(&sport->port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(&sport->port, status,
+                                ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN), ch, flg);
+
+        ignore_char:
+                serial_out(sport, PNX8XXX_LCR, serial_in(sport, PNX8XXX_LCR) |
+                                PNX8XXX_UART_LCR_RX_NEXT);
+                status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
+                         ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
+        }
+        tty_flip_buffer_push(tty);
+}
+
+static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
+{
+        struct circ_buf *xmit = &sport->port.state->xmit;
+
+        if (sport->port.x_char) {
+                serial_out(sport, PNX8XXX_FIFO, sport->port.x_char);
+                sport->port.icount.tx++;
+                sport->port.x_char = 0;
+                return;
+        }
+
+        /*
+         * Check the modem control lines before
+         * transmitting anything.
+         */
+        pnx8xxx_mctrl_check(sport);
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+                pnx8xxx_stop_tx(&sport->port);
+                return;
+        }
+
+        /*
+         * TX while bytes available
+         */
+        while (((serial_in(sport, PNX8XXX_FIFO) &
+                                        PNX8XXX_UART_FIFO_TXFIFO) >> 16) < 16) {
+                serial_out(sport, PNX8XXX_FIFO, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                sport->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&sport->port);
+
+        if (uart_circ_empty(xmit))
+                pnx8xxx_stop_tx(&sport->port);
+}
+
+static irqreturn_t pnx8xxx_int(int irq, void *dev_id)
+{
+        struct pnx8xxx_port *sport = dev_id;
+        unsigned int status;
+
+        spin_lock(&sport->port.lock);
+        /* Get the interrupts */
+        status  = serial_in(sport, PNX8XXX_ISTAT) & serial_in(sport, PNX8XXX_IEN);
+
+        /* Byte or break signal received */
+        if (status & (PNX8XXX_UART_INT_RX | PNX8XXX_UART_INT_BREAK))
+                pnx8xxx_rx_chars(sport);
+
+        /* TX holding register empty - transmit a byte */
+        if (status & PNX8XXX_UART_INT_TX)
+                pnx8xxx_tx_chars(sport);
+
+        /* Clear the ISTAT register */
+        serial_out(sport, PNX8XXX_ICLR, status);
+
+        spin_unlock(&sport->port.lock);
+        return IRQ_HANDLED;
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter is not busy.
+ */
+static unsigned int pnx8xxx_tx_empty(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+
+        return serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int pnx8xxx_get_mctrl(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        unsigned int mctrl = TIOCM_DSR;
+        unsigned int msr;
+
+        /* REVISIT */
+
+        msr = serial_in(sport, PNX8XXX_MCR);
+
+        mctrl |= msr & PNX8XXX_UART_MCR_CTS ? TIOCM_CTS : 0;
+        mctrl |= msr & PNX8XXX_UART_MCR_DCD ? TIOCM_CAR : 0;
+
+        return mctrl;
+}
+
+static void pnx8xxx_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+#if     0       /* FIXME */
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        unsigned int msr;
+#endif
+}
+
+/*
+ * Interrupts always disabled.
+ */
+static void pnx8xxx_break_ctl(struct uart_port *port, int break_state)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        unsigned long flags;
+        unsigned int lcr;
+
+        spin_lock_irqsave(&sport->port.lock, flags);
+        lcr = serial_in(sport, PNX8XXX_LCR);
+        if (break_state == -1)
+                lcr |= PNX8XXX_UART_LCR_TXBREAK;
+        else
+                lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
+        serial_out(sport, PNX8XXX_LCR, lcr);
+        spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static int pnx8xxx_startup(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        int retval;
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(sport->port.irq, pnx8xxx_int, 0,
+                             "pnx8xxx-uart", sport);
+        if (retval)
+                return retval;
+
+        /*
+         * Finally, clear and enable interrupts
+         */
+
+        serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
+                             PNX8XXX_UART_INT_ALLTX);
+
+        serial_out(sport, PNX8XXX_IEN, serial_in(sport, PNX8XXX_IEN) |
+                            PNX8XXX_UART_INT_ALLRX |
+                            PNX8XXX_UART_INT_ALLTX);
+
+        /*
+         * Enable modem status interrupts
+         */
+        spin_lock_irq(&sport->port.lock);
+        pnx8xxx_enable_ms(&sport->port);
+        spin_unlock_irq(&sport->port.lock);
+
+        return 0;
+}
+
+static void pnx8xxx_shutdown(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        int lcr;
+
+        /*
+         * Stop our timer.
+         */
+        del_timer_sync(&sport->timer);
+
+        /*
+         * Disable all interrupts
+         */
+        serial_out(sport, PNX8XXX_IEN, 0);
+
+        /*
+         * Reset the Tx and Rx FIFOS, disable the break condition
+         */
+        lcr = serial_in(sport, PNX8XXX_LCR);
+        lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
+        lcr |= PNX8XXX_UART_LCR_TX_RST | PNX8XXX_UART_LCR_RX_RST;
+        serial_out(sport, PNX8XXX_LCR, lcr);
+
+        /*
+         * Clear all interrupts
+         */
+        serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
+                             PNX8XXX_UART_INT_ALLTX);
+
+        /*
+         * Free the interrupt
+         */
+        free_irq(sport->port.irq, sport);
+}
+
+static void
+pnx8xxx_set_termios(struct uart_port *port, struct ktermios *termios,
+                   struct ktermios *old)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        unsigned long flags;
+        unsigned int lcr_fcr, old_ien, baud, quot;
+        unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
+
+        /*
+         * We only support CS7 and CS8.
+         */
+        while ((termios->c_cflag & CSIZE) != CS7 &&
+               (termios->c_cflag & CSIZE) != CS8) {
+                termios->c_cflag &= ~CSIZE;
+                termios->c_cflag |= old_csize;
+                old_csize = CS8;
+        }
+
+        if ((termios->c_cflag & CSIZE) == CS8)
+                lcr_fcr = PNX8XXX_UART_LCR_8BIT;
+        else
+                lcr_fcr = 0;
+
+        if (termios->c_cflag & CSTOPB)
+                lcr_fcr |= PNX8XXX_UART_LCR_2STOPB;
+        if (termios->c_cflag & PARENB) {
+                lcr_fcr |= PNX8XXX_UART_LCR_PAREN;
+                if (!(termios->c_cflag & PARODD))
+                        lcr_fcr |= PNX8XXX_UART_LCR_PAREVN;
+        }
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+        quot = uart_get_divisor(port, baud);
+
+        spin_lock_irqsave(&sport->port.lock, flags);
+
+        sport->port.read_status_mask = ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN) |
+                                ISTAT_TO_SM(PNX8XXX_UART_INT_EMPTY) |
+                                ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
+        if (termios->c_iflag & INPCK)
+                sport->port.read_status_mask |=
+                        FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
+                        FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                sport->port.read_status_mask |=
+                        ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
+
+        /*
+         * Characters to ignore
+         */
+        sport->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                sport->port.ignore_status_mask |=
+                        FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
+                        FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
+        if (termios->c_iflag & IGNBRK) {
+                sport->port.ignore_status_mask |=
+                        ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        sport->port.ignore_status_mask |=
+                                ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN);
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                sport->port.ignore_status_mask |=
+                        ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
+
+        del_timer_sync(&sport->timer);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /*
+         * disable interrupts and drain transmitter
+         */
+        old_ien = serial_in(sport, PNX8XXX_IEN);
+        serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
+                                        PNX8XXX_UART_INT_ALLRX));
+
+        while (serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA)
+                barrier();
+
+        /* then, disable everything */
+        serial_out(sport, PNX8XXX_IEN, 0);
+
+        /* Reset the Rx and Tx FIFOs too */
+        lcr_fcr |= PNX8XXX_UART_LCR_TX_RST;
+        lcr_fcr |= PNX8XXX_UART_LCR_RX_RST;
+
+        /* set the parity, stop bits and data size */
+        serial_out(sport, PNX8XXX_LCR, lcr_fcr);
+
+        /* set the baud rate */
+        quot -= 1;
+        serial_out(sport, PNX8XXX_BAUD, quot);
+
+        serial_out(sport, PNX8XXX_ICLR, -1);
+
+        serial_out(sport, PNX8XXX_IEN, old_ien);
+
+        if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
+                pnx8xxx_enable_ms(&sport->port);
+
+        spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static const char *pnx8xxx_type(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+
+        return sport->port.type == PORT_PNX8XXX ? "PNX8XXX" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void pnx8xxx_release_port(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+
+        release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int pnx8xxx_request_port(struct uart_port *port)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
+                        "pnx8xxx-uart") != NULL ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void pnx8xxx_config_port(struct uart_port *port, int flags)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+
+        if (flags & UART_CONFIG_TYPE &&
+            pnx8xxx_request_port(&sport->port) == 0)
+                sport->port.type = PORT_PNX8XXX;
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ * The only change we allow are to the flags and type, and
+ * even then only between PORT_PNX8XXX and PORT_UNKNOWN
+ */
+static int
+pnx8xxx_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_PNX8XXX)
+                ret = -EINVAL;
+        if (sport->port.irq != ser->irq)
+                ret = -EINVAL;
+        if (ser->io_type != SERIAL_IO_MEM)
+                ret = -EINVAL;
+        if (sport->port.uartclk / 16 != ser->baud_base)
+                ret = -EINVAL;
+        if ((void *)sport->port.mapbase != ser->iomem_base)
+                ret = -EINVAL;
+        if (sport->port.iobase != ser->port)
+                ret = -EINVAL;
+        if (ser->hub6 != 0)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops pnx8xxx_pops = {
+        .tx_empty       = pnx8xxx_tx_empty,
+        .set_mctrl      = pnx8xxx_set_mctrl,
+        .get_mctrl      = pnx8xxx_get_mctrl,
+        .stop_tx        = pnx8xxx_stop_tx,
+        .start_tx       = pnx8xxx_start_tx,
+        .stop_rx        = pnx8xxx_stop_rx,
+        .enable_ms      = pnx8xxx_enable_ms,
+        .break_ctl      = pnx8xxx_break_ctl,
+        .startup        = pnx8xxx_startup,
+        .shutdown       = pnx8xxx_shutdown,
+        .set_termios    = pnx8xxx_set_termios,
+        .type           = pnx8xxx_type,
+        .release_port   = pnx8xxx_release_port,
+        .request_port   = pnx8xxx_request_port,
+        .config_port    = pnx8xxx_config_port,
+        .verify_port    = pnx8xxx_verify_port,
+};
+
+
+/*
+ * Setup the PNX8XXX serial ports.
+ *
+ * Note also that we support "console=ttySx" where "x" is either 0 or 1.
+ */
+static void __init pnx8xxx_init_ports(void)
+{
+        static int first = 1;
+        int i;
+
+        if (!first)
+                return;
+        first = 0;
+
+        for (i = 0; i < NR_PORTS; i++) {
+                init_timer(&pnx8xxx_ports[i].timer);
+                pnx8xxx_ports[i].timer.function = pnx8xxx_timeout;
+                pnx8xxx_ports[i].timer.data     = (unsigned long)&pnx8xxx_ports[i];
+                pnx8xxx_ports[i].port.ops = &pnx8xxx_pops;
+        }
+}
+
+#ifdef CONFIG_SERIAL_PNX8XXX_CONSOLE
+
+static void pnx8xxx_console_putchar(struct uart_port *port, int ch)
+{
+        struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
+        int status;
+
+        do {
+                /* Wait for UART_TX register to empty */
+                status = serial_in(sport, PNX8XXX_FIFO);
+        } while (status & PNX8XXX_UART_FIFO_TXFIFO);
+        serial_out(sport, PNX8XXX_FIFO, ch);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */static void
+pnx8xxx_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct pnx8xxx_port *sport = &pnx8xxx_ports[co->index];
+        unsigned int old_ien, status;
+
+        /*
+         *      First, save IEN and then disable interrupts
+         */
+        old_ien = serial_in(sport, PNX8XXX_IEN);
+        serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
+                                        PNX8XXX_UART_INT_ALLRX));
+
+        uart_console_write(&sport->port, s, count, pnx8xxx_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore IEN
+         */
+        do {
+                /* Wait for UART_TX register to empty */
+                status = serial_in(sport, PNX8XXX_FIFO);
+        } while (status & PNX8XXX_UART_FIFO_TXFIFO);
+
+        /* Clear TX and EMPTY interrupt */
+        serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_TX |
+                             PNX8XXX_UART_INT_EMPTY);
+
+        serial_out(sport, PNX8XXX_IEN, old_ien);
+}
+
+static int __init
+pnx8xxx_console_setup(struct console *co, char *options)
+{
+        struct pnx8xxx_port *sport;
+        int baud = 38400;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index == -1 || co->index >= NR_PORTS)
+                co->index = 0;
+        sport = &pnx8xxx_ports[co->index];
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&sport->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver pnx8xxx_reg;
+static struct console pnx8xxx_console = {
+        .name           = "ttyS",
+        .write          = pnx8xxx_console_write,
+        .device         = uart_console_device,
+        .setup          = pnx8xxx_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &pnx8xxx_reg,
+};
+
+static int __init pnx8xxx_rs_console_init(void)
+{
+        pnx8xxx_init_ports();
+        register_console(&pnx8xxx_console);
+        return 0;
+}
+console_initcall(pnx8xxx_rs_console_init);
+
+#define PNX8XXX_CONSOLE &pnx8xxx_console
+#else
+#define PNX8XXX_CONSOLE NULL
+#endif
+
+static struct uart_driver pnx8xxx_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "ttyS",
+        .dev_name               = "ttyS",
+        .major                  = SERIAL_PNX8XXX_MAJOR,
+        .minor                  = MINOR_START,
+        .nr                     = NR_PORTS,
+        .cons                   = PNX8XXX_CONSOLE,
+};
+
+static int pnx8xxx_serial_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
+
+        return uart_suspend_port(&pnx8xxx_reg, &sport->port);
+}
+
+static int pnx8xxx_serial_resume(struct platform_device *pdev)
+{
+        struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
+
+        return uart_resume_port(&pnx8xxx_reg, &sport->port);
+}
+
+static int pnx8xxx_serial_probe(struct platform_device *pdev)
+{
+        struct resource *res = pdev->resource;
+        int i;
+
+        for (i = 0; i < pdev->num_resources; i++, res++) {
+                if (!(res->flags & IORESOURCE_MEM))
+                        continue;
+
+                for (i = 0; i < NR_PORTS; i++) {
+                        if (pnx8xxx_ports[i].port.mapbase != res->start)
+                                continue;
+
+                        pnx8xxx_ports[i].port.dev = &pdev->dev;
+                        uart_add_one_port(&pnx8xxx_reg, &pnx8xxx_ports[i].port);
+                        platform_set_drvdata(pdev, &pnx8xxx_ports[i]);
+                        break;
+                }
+        }
+
+        return 0;
+}
+
+static int pnx8xxx_serial_remove(struct platform_device *pdev)
+{
+        struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
+
+        platform_set_drvdata(pdev, NULL);
+
+        if (sport)
+                uart_remove_one_port(&pnx8xxx_reg, &sport->port);
+
+        return 0;
+}
+
+static struct platform_driver pnx8xxx_serial_driver = {
+        .driver         = {
+                .name   = "pnx8xxx-uart",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = pnx8xxx_serial_probe,
+        .remove         = pnx8xxx_serial_remove,
+        .suspend        = pnx8xxx_serial_suspend,
+        .resume         = pnx8xxx_serial_resume,
+};
+
+static int __init pnx8xxx_serial_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: PNX8XXX driver\n");
+
+        pnx8xxx_init_ports();
+
+        ret = uart_register_driver(&pnx8xxx_reg);
+        if (ret == 0) {
+                ret = platform_driver_register(&pnx8xxx_serial_driver);
+                if (ret)
+                        uart_unregister_driver(&pnx8xxx_reg);
+        }
+        return ret;
+}
+
+static void __exit pnx8xxx_serial_exit(void)
+{
+        platform_driver_unregister(&pnx8xxx_serial_driver);
+        uart_unregister_driver(&pnx8xxx_reg);
+}
+
+module_init(pnx8xxx_serial_init);
+module_exit(pnx8xxx_serial_exit);
+
+MODULE_AUTHOR("Embedded Alley Solutions, Inc.");
+MODULE_DESCRIPTION("PNX8XXX SoCs serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_PNX8XXX_MAJOR);
+MODULE_ALIAS("platform:pnx8xxx-uart");
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
new file mode 100644
index 000000000000..4302e6e3768e
--- /dev/null
+++ b/drivers/tty/serial/pxa.c
@@ -0,0 +1,877 @@
+/*
+ *  Based on drivers/serial/8250.c by Russell King.
+ *
+ *  Author:     Nicolas Pitre
+ *  Created:    Feb 20, 2003
+ *  Copyright:  (C) 2003 Monta Vista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Note 1: This driver is made separate from the already too overloaded
+ * 8250.c because it needs some kirks of its own and that'll make it
+ * easier to add DMA support.
+ *
+ * Note 2: I'm too sick of device allocation policies for serial ports.
+ * If someone else wants to request an "official" allocation of major/minor
+ * for this driver please be my guest.  And don't forget that new hardware
+ * to come from Intel might have more than 3 or 4 of those UARTs.  Let's
+ * hope for a better port registration and dynamic device allocation scheme
+ * with the serial core maintainer satisfaction to appear soon.
+ */
+
+
+#if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/serial_reg.h>
+#include <linux/circ_buf.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+struct uart_pxa_port {
+        struct uart_port        port;
+        unsigned char           ier;
+        unsigned char           lcr;
+        unsigned char           mcr;
+        unsigned int            lsr_break_flag;
+        struct clk              *clk;
+        char                    *name;
+};
+
+static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
+{
+        offset <<= 2;
+        return readl(up->port.membase + offset);
+}
+
+static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
+{
+        offset <<= 2;
+        writel(value, up->port.membase + offset);
+}
+
+static void serial_pxa_enable_ms(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+
+        up->ier |= UART_IER_MSI;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static void serial_pxa_stop_tx(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+
+        if (up->ier & UART_IER_THRI) {
+                up->ier &= ~UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+static void serial_pxa_stop_rx(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+
+        up->ier &= ~UART_IER_RLSI;
+        up->port.read_status_mask &= ~UART_LSR_DR;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static inline void receive_chars(struct uart_pxa_port *up, int *status)
+{
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned int ch, flag;
+        int max_count = 256;
+
+        do {
+                ch = serial_in(up, UART_RX);
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+                                       UART_LSR_FE | UART_LSR_OE))) {
+                        /*
+                         * For statistics only
+                         */
+                        if (*status & UART_LSR_BI) {
+                                *status &= ~(UART_LSR_FE | UART_LSR_PE);
+                                up->port.icount.brk++;
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        goto ignore_char;
+                        } else if (*status & UART_LSR_PE)
+                                up->port.icount.parity++;
+                        else if (*status & UART_LSR_FE)
+                                up->port.icount.frame++;
+                        if (*status & UART_LSR_OE)
+                                up->port.icount.overrun++;
+
+                        /*
+                         * Mask off conditions which should be ignored.
+                         */
+                        *status &= up->port.read_status_mask;
+
+#ifdef CONFIG_SERIAL_PXA_CONSOLE
+                        if (up->port.line == up->port.cons->index) {
+                                /* Recover the break flag from console xmit */
+                                *status |= up->lsr_break_flag;
+                                up->lsr_break_flag = 0;
+                        }
+#endif
+                        if (*status & UART_LSR_BI) {
+                                flag = TTY_BREAK;
+                        } else if (*status & UART_LSR_PE)
+                                flag = TTY_PARITY;
+                        else if (*status & UART_LSR_FE)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
+
+        ignore_char:
+                *status = serial_in(up, UART_LSR);
+        } while ((*status & UART_LSR_DR) && (max_count-- > 0));
+        tty_flip_buffer_push(tty);
+}
+
+static void transmit_chars(struct uart_pxa_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int count;
+
+        if (up->port.x_char) {
+                serial_out(up, UART_TX, up->port.x_char);
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+                serial_pxa_stop_tx(&up->port);
+                return;
+        }
+
+        count = up->port.fifosize / 2;
+        do {
+                serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+
+        if (uart_circ_empty(xmit))
+                serial_pxa_stop_tx(&up->port);
+}
+
+static void serial_pxa_start_tx(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+
+        if (!(up->ier & UART_IER_THRI)) {
+                up->ier |= UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+}
+
+static inline void check_modem_status(struct uart_pxa_port *up)
+{
+        int status;
+
+        status = serial_in(up, UART_MSR);
+
+        if ((status & UART_MSR_ANY_DELTA) == 0)
+                return;
+
+        if (status & UART_MSR_TERI)
+                up->port.icount.rng++;
+        if (status & UART_MSR_DDSR)
+                up->port.icount.dsr++;
+        if (status & UART_MSR_DDCD)
+                uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+        if (status & UART_MSR_DCTS)
+                uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+
+        wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
+{
+        struct uart_pxa_port *up = dev_id;
+        unsigned int iir, lsr;
+
+        iir = serial_in(up, UART_IIR);
+        if (iir & UART_IIR_NO_INT)
+                return IRQ_NONE;
+        lsr = serial_in(up, UART_LSR);
+        if (lsr & UART_LSR_DR)
+                receive_chars(up, &lsr);
+        check_modem_status(up);
+        if (lsr & UART_LSR_THRE)
+                transmit_chars(up);
+        return IRQ_HANDLED;
+}
+
+static unsigned int serial_pxa_tx_empty(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        unsigned long flags;
+        unsigned int ret;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return ret;
+}
+
+static unsigned int serial_pxa_get_mctrl(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        unsigned char status;
+        unsigned int ret;
+
+        status = serial_in(up, UART_MSR);
+
+        ret = 0;
+        if (status & UART_MSR_DCD)
+                ret |= TIOCM_CAR;
+        if (status & UART_MSR_RI)
+                ret |= TIOCM_RNG;
+        if (status & UART_MSR_DSR)
+                ret |= TIOCM_DSR;
+        if (status & UART_MSR_CTS)
+                ret |= TIOCM_CTS;
+        return ret;
+}
+
+static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        unsigned char mcr = 0;
+
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        mcr |= up->mcr;
+
+        serial_out(up, UART_MCR, mcr);
+}
+
+static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (break_state == -1)
+                up->lcr |= UART_LCR_SBC;
+        else
+                up->lcr &= ~UART_LCR_SBC;
+        serial_out(up, UART_LCR, up->lcr);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+#if 0
+static void serial_pxa_dma_init(struct pxa_uart *up)
+{
+        up->rxdma =
+                pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up);
+        if (up->rxdma < 0)
+                goto out;
+        up->txdma =
+                pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up);
+        if (up->txdma < 0)
+                goto err_txdma;
+        up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL);
+        if (!up->dmadesc)
+                goto err_alloc;
+
+        /* ... */
+err_alloc:
+        pxa_free_dma(up->txdma);
+err_rxdma:
+        pxa_free_dma(up->rxdma);
+out:
+        return;
+}
+#endif
+
+static int serial_pxa_startup(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        unsigned long flags;
+        int retval;
+
+        if (port->line == 3) /* HWUART */
+                up->mcr |= UART_MCR_AFE;
+        else
+                up->mcr = 0;
+
+        up->port.uartclk = clk_get_rate(up->clk);
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
+        if (retval)
+                return retval;
+
+        /*
+         * Clear the FIFO buffers and disable them.
+         * (they will be reenabled in set_termios())
+         */
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                        UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+        serial_out(up, UART_FCR, 0);
+
+        /*
+         * Clear the interrupt registers.
+         */
+        (void) serial_in(up, UART_LSR);
+        (void) serial_in(up, UART_RX);
+        (void) serial_in(up, UART_IIR);
+        (void) serial_in(up, UART_MSR);
+
+        /*
+         * Now, initialize the UART
+         */
+        serial_out(up, UART_LCR, UART_LCR_WLEN8);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        up->port.mctrl |= TIOCM_OUT2;
+        serial_pxa_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Finally, enable interrupts.  Note: Modem status interrupts
+         * are set via set_termios(), which will be occurring imminently
+         * anyway, so we don't enable them here.
+         */
+        up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
+        serial_out(up, UART_IER, up->ier);
+
+        /*
+         * And clear the interrupt registers again for luck.
+         */
+        (void) serial_in(up, UART_LSR);
+        (void) serial_in(up, UART_RX);
+        (void) serial_in(up, UART_IIR);
+        (void) serial_in(up, UART_MSR);
+
+        return 0;
+}
+
+static void serial_pxa_shutdown(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        unsigned long flags;
+
+        free_irq(up->port.irq, up);
+
+        /*
+         * Disable interrupts from this port
+         */
+        up->ier = 0;
+        serial_out(up, UART_IER, 0);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        up->port.mctrl &= ~TIOCM_OUT2;
+        serial_pxa_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Disable break condition and FIFOs
+         */
+        serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
+        serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                                  UART_FCR_CLEAR_RCVR |
+                                  UART_FCR_CLEAR_XMIT);
+        serial_out(up, UART_FCR, 0);
+}
+
+static void
+serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
+                       struct ktermios *old)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        unsigned char cval, fcr = 0;
+        unsigned long flags;
+        unsigned int baud, quot;
+        unsigned int dll;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                cval = UART_LCR_WLEN5;
+                break;
+        case CS6:
+                cval = UART_LCR_WLEN6;
+                break;
+        case CS7:
+                cval = UART_LCR_WLEN7;
+                break;
+        default:
+        case CS8:
+                cval = UART_LCR_WLEN8;
+                break;
+        }
+
+        if (termios->c_cflag & CSTOPB)
+                cval |= UART_LCR_STOP;
+        if (termios->c_cflag & PARENB)
+                cval |= UART_LCR_PARITY;
+        if (!(termios->c_cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+        quot = uart_get_divisor(port, baud);
+
+        if ((up->port.uartclk / quot) < (2400 * 16))
+                fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
+        else if ((up->port.uartclk / quot) < (230400 * 16))
+                fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
+        else
+                fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
+
+        /*
+         * Ok, we're now changing the port state.  Do it with
+         * interrupts disabled.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /*
+         * Ensure the port will be enabled.
+         * This is required especially for serial console.
+         */
+        up->ier |= UART_IER_UUE;
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+        if (termios->c_iflag & INPCK)
+                up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= UART_LSR_BI;
+
+        /*
+         * Characters to ignore
+         */
+        up->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+        if (termios->c_iflag & IGNBRK) {
+                up->port.ignore_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        up->port.ignore_status_mask |= UART_LSR_OE;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= UART_LSR_DR;
+
+        /*
+         * CTS flow control flag and modem status interrupts
+         */
+        up->ier &= ~UART_IER_MSI;
+        if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+                up->ier |= UART_IER_MSI;
+
+        serial_out(up, UART_IER, up->ier);
+
+        if (termios->c_cflag & CRTSCTS)
+                up->mcr |= UART_MCR_AFE;
+        else
+                up->mcr &= ~UART_MCR_AFE;
+
+        serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
+        serial_out(up, UART_DLL, quot & 0xff);          /* LS of divisor */
+
+        /*
+         * work around Errata #75 according to Intel(R) PXA27x Processor Family
+         * Specification Update (Nov 2005)
+         */
+        dll = serial_in(up, UART_DLL);
+        WARN_ON(dll != (quot & 0xff));
+
+        serial_out(up, UART_DLM, quot >> 8);            /* MS of divisor */
+        serial_out(up, UART_LCR, cval);                 /* reset DLAB */
+        up->lcr = cval;                                 /* Save LCR */
+        serial_pxa_set_mctrl(&up->port, up->port.mctrl);
+        serial_out(up, UART_FCR, fcr);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+serial_pxa_pm(struct uart_port *port, unsigned int state,
+              unsigned int oldstate)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+
+        if (!state)
+                clk_enable(up->clk);
+        else
+                clk_disable(up->clk);
+}
+
+static void serial_pxa_release_port(struct uart_port *port)
+{
+}
+
+static int serial_pxa_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void serial_pxa_config_port(struct uart_port *port, int flags)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        up->port.type = PORT_PXA;
+}
+
+static int
+serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        /* we don't want the core code to modify any port params */
+        return -EINVAL;
+}
+
+static const char *
+serial_pxa_type(struct uart_port *port)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+        return up->name;
+}
+
+static struct uart_pxa_port *serial_pxa_ports[4];
+static struct uart_driver serial_pxa_reg;
+
+#ifdef CONFIG_SERIAL_PXA_CONSOLE
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+/*
+ *      Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct uart_pxa_port *up)
+{
+        unsigned int status, tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        do {
+                status = serial_in(up, UART_LSR);
+
+                if (status & UART_LSR_BI)
+                        up->lsr_break_flag = UART_LSR_BI;
+
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+
+        /* Wait up to 1s for flow control if necessary */
+        if (up->port.flags & UPF_CONS_FLOW) {
+                tmout = 1000000;
+                while (--tmout &&
+                       ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
+                        udelay(1);
+        }
+}
+
+static void serial_pxa_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_pxa_port *up = (struct uart_pxa_port *)port;
+
+        wait_for_xmitr(up);
+        serial_out(up, UART_TX, ch);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ *
+ *      The console_lock must be held when we get here.
+ */
+static void
+serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_pxa_port *up = serial_pxa_ports[co->index];
+        unsigned int ier;
+
+        clk_enable(up->clk);
+
+        /*
+         *      First save the IER then disable the interrupts
+         */
+        ier = serial_in(up, UART_IER);
+        serial_out(up, UART_IER, UART_IER_UUE);
+
+        uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the IER
+         */
+        wait_for_xmitr(up);
+        serial_out(up, UART_IER, ier);
+
+        clk_disable(up->clk);
+}
+
+static int __init
+serial_pxa_console_setup(struct console *co, char *options)
+{
+        struct uart_pxa_port *up;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (co->index == -1 || co->index >= serial_pxa_reg.nr)
+                co->index = 0;
+        up = serial_pxa_ports[co->index];
+        if (!up)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&up->port, co, baud, parity, bits, flow);
+}
+
+static struct console serial_pxa_console = {
+        .name           = "ttyS",
+        .write          = serial_pxa_console_write,
+        .device         = uart_console_device,
+        .setup          = serial_pxa_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &serial_pxa_reg,
+};
+
+#define PXA_CONSOLE     &serial_pxa_console
+#else
+#define PXA_CONSOLE     NULL
+#endif
+
+struct uart_ops serial_pxa_pops = {
+        .tx_empty       = serial_pxa_tx_empty,
+        .set_mctrl      = serial_pxa_set_mctrl,
+        .get_mctrl      = serial_pxa_get_mctrl,
+        .stop_tx        = serial_pxa_stop_tx,
+        .start_tx       = serial_pxa_start_tx,
+        .stop_rx        = serial_pxa_stop_rx,
+        .enable_ms      = serial_pxa_enable_ms,
+        .break_ctl      = serial_pxa_break_ctl,
+        .startup        = serial_pxa_startup,
+        .shutdown       = serial_pxa_shutdown,
+        .set_termios    = serial_pxa_set_termios,
+        .pm             = serial_pxa_pm,
+        .type           = serial_pxa_type,
+        .release_port   = serial_pxa_release_port,
+        .request_port   = serial_pxa_request_port,
+        .config_port    = serial_pxa_config_port,
+        .verify_port    = serial_pxa_verify_port,
+};
+
+static struct uart_driver serial_pxa_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "PXA serial",
+        .dev_name       = "ttyS",
+        .major          = TTY_MAJOR,
+        .minor          = 64,
+        .nr             = 4,
+        .cons           = PXA_CONSOLE,
+};
+
+#ifdef CONFIG_PM
+static int serial_pxa_suspend(struct device *dev)
+{
+        struct uart_pxa_port *sport = dev_get_drvdata(dev);
+
+        if (sport)
+                uart_suspend_port(&serial_pxa_reg, &sport->port);
+
+        return 0;
+}
+
+static int serial_pxa_resume(struct device *dev)
+{
+        struct uart_pxa_port *sport = dev_get_drvdata(dev);
+
+        if (sport)
+                uart_resume_port(&serial_pxa_reg, &sport->port);
+
+        return 0;
+}
+
+static const struct dev_pm_ops serial_pxa_pm_ops = {
+        .suspend        = serial_pxa_suspend,
+        .resume         = serial_pxa_resume,
+};
+#endif
+
+static int serial_pxa_probe(struct platform_device *dev)
+{
+        struct uart_pxa_port *sport;
+        struct resource *mmres, *irqres;
+        int ret;
+
+        mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
+        if (!mmres || !irqres)
+                return -ENODEV;
+
+        sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
+        if (!sport)
+                return -ENOMEM;
+
+        sport->clk = clk_get(&dev->dev, NULL);
+        if (IS_ERR(sport->clk)) {
+                ret = PTR_ERR(sport->clk);
+                goto err_free;
+        }
+
+        sport->port.type = PORT_PXA;
+        sport->port.iotype = UPIO_MEM;
+        sport->port.mapbase = mmres->start;
+        sport->port.irq = irqres->start;
+        sport->port.fifosize = 64;
+        sport->port.ops = &serial_pxa_pops;
+        sport->port.line = dev->id;
+        sport->port.dev = &dev->dev;
+        sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
+        sport->port.uartclk = clk_get_rate(sport->clk);
+
+        switch (dev->id) {
+        case 0: sport->name = "FFUART"; break;
+        case 1: sport->name = "BTUART"; break;
+        case 2: sport->name = "STUART"; break;
+        case 3: sport->name = "HWUART"; break;
+        default:
+                sport->name = "???";
+                break;
+        }
+
+        sport->port.membase = ioremap(mmres->start, mmres->end - mmres->start + 1);
+        if (!sport->port.membase) {
+                ret = -ENOMEM;
+                goto err_clk;
+        }
+
+        serial_pxa_ports[dev->id] = sport;
+
+        uart_add_one_port(&serial_pxa_reg, &sport->port);
+        platform_set_drvdata(dev, sport);
+
+        return 0;
+
+ err_clk:
+        clk_put(sport->clk);
+ err_free:
+        kfree(sport);
+        return ret;
+}
+
+static int serial_pxa_remove(struct platform_device *dev)
+{
+        struct uart_pxa_port *sport = platform_get_drvdata(dev);
+
+        platform_set_drvdata(dev, NULL);
+
+        uart_remove_one_port(&serial_pxa_reg, &sport->port);
+        clk_put(sport->clk);
+        kfree(sport);
+
+        return 0;
+}
+
+static struct platform_driver serial_pxa_driver = {
+        .probe          = serial_pxa_probe,
+        .remove         = serial_pxa_remove,
+
+        .driver         = {
+                .name   = "pxa2xx-uart",
+                .owner  = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm     = &serial_pxa_pm_ops,
+#endif
+        },
+};
+
+int __init serial_pxa_init(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&serial_pxa_reg);
+        if (ret != 0)
+                return ret;
+
+        ret = platform_driver_register(&serial_pxa_driver);
+        if (ret != 0)
+                uart_unregister_driver(&serial_pxa_reg);
+
+        return ret;
+}
+
+void __exit serial_pxa_exit(void)
+{
+        platform_driver_unregister(&serial_pxa_driver);
+        uart_unregister_driver(&serial_pxa_reg);
+}
+
+module_init(serial_pxa_init);
+module_exit(serial_pxa_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa2xx-uart");
diff --git a/drivers/tty/serial/s3c2400.c b/drivers/tty/serial/s3c2400.c
new file mode 100644
index 000000000000..d13051b3df87
--- /dev/null
+++ b/drivers/tty/serial/s3c2400.c
@@ -0,0 +1,105 @@
+/*
+ * Driver for Samsung SoC onboard UARTs.
+ *
+ * Ben Dooks, Copyright (c) 2003-2005 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#include <asm/irq.h>
+
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-gpio.h>
+
+#include "samsung.h"
+
+static int s3c2400_serial_getsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        clk->divisor = 1;
+        clk->name = "pclk";
+
+        return 0;
+}
+
+static int s3c2400_serial_setsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        return 0;
+}
+
+static int s3c2400_serial_resetport(struct uart_port *port,
+                                    struct s3c2410_uartcfg *cfg)
+{
+        dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n",
+            port, port->mapbase, cfg);
+
+        wr_regl(port, S3C2410_UCON,  cfg->ucon);
+        wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+        /* reset both fifos */
+
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+        return 0;
+}
+
+static struct s3c24xx_uart_info s3c2400_uart_inf = {
+        .name           = "Samsung S3C2400 UART",
+        .type           = PORT_S3C2400,
+        .fifosize       = 16,
+        .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
+        .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
+        .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
+        .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
+        .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
+        .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
+        .get_clksrc     = s3c2400_serial_getsource,
+        .set_clksrc     = s3c2400_serial_setsource,
+        .reset_port     = s3c2400_serial_resetport,
+};
+
+static int s3c2400_serial_probe(struct platform_device *dev)
+{
+        return s3c24xx_serial_probe(dev, &s3c2400_uart_inf);
+}
+
+static struct platform_driver s3c2400_serial_driver = {
+        .probe          = s3c2400_serial_probe,
+        .remove         = __devexit_p(s3c24xx_serial_remove),
+        .driver         = {
+                .name   = "s3c2400-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+s3c24xx_console_init(&s3c2400_serial_driver, &s3c2400_uart_inf);
+
+static inline int s3c2400_serial_init(void)
+{
+        return s3c24xx_serial_init(&s3c2400_serial_driver, &s3c2400_uart_inf);
+}
+
+static inline void s3c2400_serial_exit(void)
+{
+        platform_driver_unregister(&s3c2400_serial_driver);
+}
+
+module_init(s3c2400_serial_init);
+module_exit(s3c2400_serial_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("Samsung S3C2400 SoC Serial port driver");
+MODULE_ALIAS("platform:s3c2400-uart");
diff --git a/drivers/tty/serial/s3c2410.c b/drivers/tty/serial/s3c2410.c
new file mode 100644
index 000000000000..bffe6ff9b158
--- /dev/null
+++ b/drivers/tty/serial/s3c2410.c
@@ -0,0 +1,117 @@
+/*
+ * Driver for Samsung S3C2410 SoC onboard UARTs.
+ *
+ * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-gpio.h>
+
+#include "samsung.h"
+
+static int s3c2410_serial_setsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        if (strcmp(clk->name, "uclk") == 0)
+                ucon |= S3C2410_UCON_UCLK;
+        else
+                ucon &= ~S3C2410_UCON_UCLK;
+
+        wr_regl(port, S3C2410_UCON, ucon);
+        return 0;
+}
+
+static int s3c2410_serial_getsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        clk->divisor = 1;
+        clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
+
+        return 0;
+}
+
+static int s3c2410_serial_resetport(struct uart_port *port,
+                                    struct s3c2410_uartcfg *cfg)
+{
+        dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
+            port, port->mapbase, cfg);
+
+        wr_regl(port, S3C2410_UCON,  cfg->ucon);
+        wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+        /* reset both fifos */
+
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+        return 0;
+}
+
+static struct s3c24xx_uart_info s3c2410_uart_inf = {
+        .name           = "Samsung S3C2410 UART",
+        .type           = PORT_S3C2410,
+        .fifosize       = 16,
+        .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
+        .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
+        .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
+        .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
+        .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
+        .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
+        .get_clksrc     = s3c2410_serial_getsource,
+        .set_clksrc     = s3c2410_serial_setsource,
+        .reset_port     = s3c2410_serial_resetport,
+};
+
+static int s3c2410_serial_probe(struct platform_device *dev)
+{
+        return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
+}
+
+static struct platform_driver s3c2410_serial_driver = {
+        .probe          = s3c2410_serial_probe,
+        .remove         = __devexit_p(s3c24xx_serial_remove),
+        .driver         = {
+                .name   = "s3c2410-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+s3c24xx_console_init(&s3c2410_serial_driver, &s3c2410_uart_inf);
+
+static int __init s3c2410_serial_init(void)
+{
+        return s3c24xx_serial_init(&s3c2410_serial_driver, &s3c2410_uart_inf);
+}
+
+static void __exit s3c2410_serial_exit(void)
+{
+        platform_driver_unregister(&s3c2410_serial_driver);
+}
+
+module_init(s3c2410_serial_init);
+module_exit(s3c2410_serial_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("Samsung S3C2410 SoC Serial port driver");
+MODULE_ALIAS("platform:s3c2410-uart");
diff --git a/drivers/tty/serial/s3c2412.c b/drivers/tty/serial/s3c2412.c
new file mode 100644
index 000000000000..7e2b9504a687
--- /dev/null
+++ b/drivers/tty/serial/s3c2412.c
@@ -0,0 +1,151 @@
+/*
+ * Driver for Samsung S3C2412 and S3C2413 SoC onboard UARTs.
+ *
+ * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-gpio.h>
+
+#include "samsung.h"
+
+static int s3c2412_serial_setsource(struct uart_port *port,
+                                     struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        ucon &= ~S3C2412_UCON_CLKMASK;
+
+        if (strcmp(clk->name, "uclk") == 0)
+                ucon |= S3C2440_UCON_UCLK;
+        else if (strcmp(clk->name, "pclk") == 0)
+                ucon |= S3C2440_UCON_PCLK;
+        else if (strcmp(clk->name, "usysclk") == 0)
+                ucon |= S3C2412_UCON_USYSCLK;
+        else {
+                printk(KERN_ERR "unknown clock source %s\n", clk->name);
+                return -EINVAL;
+        }
+
+        wr_regl(port, S3C2410_UCON, ucon);
+        return 0;
+}
+
+
+static int s3c2412_serial_getsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        switch (ucon & S3C2412_UCON_CLKMASK) {
+        case S3C2412_UCON_UCLK:
+                clk->divisor = 1;
+                clk->name = "uclk";
+                break;
+
+        case S3C2412_UCON_PCLK:
+        case S3C2412_UCON_PCLK2:
+                clk->divisor = 1;
+                clk->name = "pclk";
+                break;
+
+        case S3C2412_UCON_USYSCLK:
+                clk->divisor = 1;
+                clk->name = "usysclk";
+                break;
+        }
+
+        return 0;
+}
+
+static int s3c2412_serial_resetport(struct uart_port *port,
+                                    struct s3c2410_uartcfg *cfg)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        dbg("%s: port=%p (%08lx), cfg=%p\n",
+            __func__, port, port->mapbase, cfg);
+
+        /* ensure we don't change the clock settings... */
+
+        ucon &= S3C2412_UCON_CLKMASK;
+
+        wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
+        wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+        /* reset both fifos */
+
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+        return 0;
+}
+
+static struct s3c24xx_uart_info s3c2412_uart_inf = {
+        .name           = "Samsung S3C2412 UART",
+        .type           = PORT_S3C2412,
+        .fifosize       = 64,
+        .has_divslot    = 1,
+        .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
+        .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
+        .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
+        .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
+        .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
+        .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
+        .get_clksrc     = s3c2412_serial_getsource,
+        .set_clksrc     = s3c2412_serial_setsource,
+        .reset_port     = s3c2412_serial_resetport,
+};
+
+/* device management */
+
+static int s3c2412_serial_probe(struct platform_device *dev)
+{
+        dbg("s3c2440_serial_probe: dev=%p\n", dev);
+        return s3c24xx_serial_probe(dev, &s3c2412_uart_inf);
+}
+
+static struct platform_driver s3c2412_serial_driver = {
+        .probe          = s3c2412_serial_probe,
+        .remove         = __devexit_p(s3c24xx_serial_remove),
+        .driver         = {
+                .name   = "s3c2412-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+s3c24xx_console_init(&s3c2412_serial_driver, &s3c2412_uart_inf);
+
+static inline int s3c2412_serial_init(void)
+{
+        return s3c24xx_serial_init(&s3c2412_serial_driver, &s3c2412_uart_inf);
+}
+
+static inline void s3c2412_serial_exit(void)
+{
+        platform_driver_unregister(&s3c2412_serial_driver);
+}
+
+module_init(s3c2412_serial_init);
+module_exit(s3c2412_serial_exit);
+
+MODULE_DESCRIPTION("Samsung S3C2412,S3C2413 SoC Serial port driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:s3c2412-uart");
diff --git a/drivers/tty/serial/s3c2440.c b/drivers/tty/serial/s3c2440.c
new file mode 100644
index 000000000000..9e10d415d5fd
--- /dev/null
+++ b/drivers/tty/serial/s3c2440.c
@@ -0,0 +1,180 @@
+/*
+ * Driver for Samsung S3C2440 and S3C2442 SoC onboard UARTs.
+ *
+ * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-gpio.h>
+
+#include "samsung.h"
+
+
+static int s3c2440_serial_setsource(struct uart_port *port,
+                                     struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        /* todo - proper fclk<>nonfclk switch. */
+
+        ucon &= ~S3C2440_UCON_CLKMASK;
+
+        if (strcmp(clk->name, "uclk") == 0)
+                ucon |= S3C2440_UCON_UCLK;
+        else if (strcmp(clk->name, "pclk") == 0)
+                ucon |= S3C2440_UCON_PCLK;
+        else if (strcmp(clk->name, "fclk") == 0)
+                ucon |= S3C2440_UCON_FCLK;
+        else {
+                printk(KERN_ERR "unknown clock source %s\n", clk->name);
+                return -EINVAL;
+        }
+
+        wr_regl(port, S3C2410_UCON, ucon);
+        return 0;
+}
+
+
+static int s3c2440_serial_getsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+        unsigned long ucon0, ucon1, ucon2;
+
+        switch (ucon & S3C2440_UCON_CLKMASK) {
+        case S3C2440_UCON_UCLK:
+                clk->divisor = 1;
+                clk->name = "uclk";
+                break;
+
+        case S3C2440_UCON_PCLK:
+        case S3C2440_UCON_PCLK2:
+                clk->divisor = 1;
+                clk->name = "pclk";
+                break;
+
+        case S3C2440_UCON_FCLK:
+                /* the fun of calculating the uart divisors on
+                 * the s3c2440 */
+
+                ucon0 = __raw_readl(S3C24XX_VA_UART0 + S3C2410_UCON);
+                ucon1 = __raw_readl(S3C24XX_VA_UART1 + S3C2410_UCON);
+                ucon2 = __raw_readl(S3C24XX_VA_UART2 + S3C2410_UCON);
+
+                printk("ucons: %08lx, %08lx, %08lx\n", ucon0, ucon1, ucon2);
+
+                ucon0 &= S3C2440_UCON0_DIVMASK;
+                ucon1 &= S3C2440_UCON1_DIVMASK;
+                ucon2 &= S3C2440_UCON2_DIVMASK;
+
+                if (ucon0 != 0) {
+                        clk->divisor = ucon0 >> S3C2440_UCON_DIVSHIFT;
+                        clk->divisor += 6;
+                } else if (ucon1 != 0) {
+                        clk->divisor = ucon1 >> S3C2440_UCON_DIVSHIFT;
+                        clk->divisor += 21;
+                } else if (ucon2 != 0) {
+                        clk->divisor = ucon2 >> S3C2440_UCON_DIVSHIFT;
+                        clk->divisor += 36;
+                } else {
+                        /* manual calims 44, seems to be 9 */
+                        clk->divisor = 9;
+                }
+
+                clk->name = "fclk";
+                break;
+        }
+
+        return 0;
+}
+
+static int s3c2440_serial_resetport(struct uart_port *port,
+                                    struct s3c2410_uartcfg *cfg)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        dbg("s3c2440_serial_resetport: port=%p (%08lx), cfg=%p\n",
+            port, port->mapbase, cfg);
+
+        /* ensure we don't change the clock settings... */
+
+        ucon &= (S3C2440_UCON0_DIVMASK | (3<<10));
+
+        wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
+        wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+        /* reset both fifos */
+
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+        return 0;
+}
+
+static struct s3c24xx_uart_info s3c2440_uart_inf = {
+        .name           = "Samsung S3C2440 UART",
+        .type           = PORT_S3C2440,
+        .fifosize       = 64,
+        .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
+        .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
+        .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
+        .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
+        .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
+        .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
+        .get_clksrc     = s3c2440_serial_getsource,
+        .set_clksrc     = s3c2440_serial_setsource,
+        .reset_port     = s3c2440_serial_resetport,
+};
+
+/* device management */
+
+static int s3c2440_serial_probe(struct platform_device *dev)
+{
+        dbg("s3c2440_serial_probe: dev=%p\n", dev);
+        return s3c24xx_serial_probe(dev, &s3c2440_uart_inf);
+}
+
+static struct platform_driver s3c2440_serial_driver = {
+        .probe          = s3c2440_serial_probe,
+        .remove         = __devexit_p(s3c24xx_serial_remove),
+        .driver         = {
+                .name   = "s3c2440-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+s3c24xx_console_init(&s3c2440_serial_driver, &s3c2440_uart_inf);
+
+static int __init s3c2440_serial_init(void)
+{
+        return s3c24xx_serial_init(&s3c2440_serial_driver, &s3c2440_uart_inf);
+}
+
+static void __exit s3c2440_serial_exit(void)
+{
+        platform_driver_unregister(&s3c2440_serial_driver);
+}
+
+module_init(s3c2440_serial_init);
+module_exit(s3c2440_serial_exit);
+
+MODULE_DESCRIPTION("Samsung S3C2440,S3C2442 SoC Serial port driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:s3c2440-uart");
diff --git a/drivers/tty/serial/s3c24a0.c b/drivers/tty/serial/s3c24a0.c
new file mode 100644
index 000000000000..914eff22e499
--- /dev/null
+++ b/drivers/tty/serial/s3c24a0.c
@@ -0,0 +1,117 @@
+/*
+ * Driver for Samsung S3C24A0 SoC onboard UARTs.
+ *
+ * Based on drivers/serial/s3c2410.c
+ *
+ * Author: Sandeep Patil <sandeep.patil@azingo.com>
+ *
+ * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+#include <mach/regs-gpio.h>
+
+#include "samsung.h"
+
+static int s3c24a0_serial_setsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        if (strcmp(clk->name, "uclk") == 0)
+                ucon |= S3C2410_UCON_UCLK;
+        else
+                ucon &= ~S3C2410_UCON_UCLK;
+
+        wr_regl(port, S3C2410_UCON, ucon);
+        return 0;
+}
+
+static int s3c24a0_serial_getsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        clk->divisor = 1;
+        clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
+
+        return 0;
+}
+
+static int s3c24a0_serial_resetport(struct uart_port *port,
+                                    struct s3c2410_uartcfg *cfg)
+{
+        dbg("s3c24a0_serial_resetport: port=%p (%08lx), cfg=%p\n",
+            port, port->mapbase, cfg);
+
+        wr_regl(port, S3C2410_UCON,  cfg->ucon);
+        wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+        /* reset both fifos */
+
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+        return 0;
+}
+
+static struct s3c24xx_uart_info s3c24a0_uart_inf = {
+        .name           = "Samsung S3C24A0 UART",
+        .type           = PORT_S3C2410,
+        .fifosize       = 16,
+        .rx_fifomask    = S3C24A0_UFSTAT_RXMASK,
+        .rx_fifoshift   = S3C24A0_UFSTAT_RXSHIFT,
+        .rx_fifofull    = S3C24A0_UFSTAT_RXFULL,
+        .tx_fifofull    = S3C24A0_UFSTAT_TXFULL,
+        .tx_fifomask    = S3C24A0_UFSTAT_TXMASK,
+        .tx_fifoshift   = S3C24A0_UFSTAT_TXSHIFT,
+        .get_clksrc     = s3c24a0_serial_getsource,
+        .set_clksrc     = s3c24a0_serial_setsource,
+        .reset_port     = s3c24a0_serial_resetport,
+};
+
+static int s3c24a0_serial_probe(struct platform_device *dev)
+{
+        return s3c24xx_serial_probe(dev, &s3c24a0_uart_inf);
+}
+
+static struct platform_driver s3c24a0_serial_driver = {
+        .probe          = s3c24a0_serial_probe,
+        .remove         = __devexit_p(s3c24xx_serial_remove),
+        .driver         = {
+                .name   = "s3c24a0-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+s3c24xx_console_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf);
+
+static int __init s3c24a0_serial_init(void)
+{
+        return s3c24xx_serial_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf);
+}
+
+static void __exit s3c24a0_serial_exit(void)
+{
+        platform_driver_unregister(&s3c24a0_serial_driver);
+}
+
+module_init(s3c24a0_serial_init);
+module_exit(s3c24a0_serial_exit);
+
diff --git a/drivers/tty/serial/s3c6400.c b/drivers/tty/serial/s3c6400.c
new file mode 100644
index 000000000000..ded26c42ff37
--- /dev/null
+++ b/drivers/tty/serial/s3c6400.c
@@ -0,0 +1,151 @@
+/*
+ * Driver for Samsung S3C6400 and S3C6410 SoC onboard UARTs.
+ *
+ * Copyright 2008 Openmoko,  Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+
+#include "samsung.h"
+
+static int s3c6400_serial_setsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        if (strcmp(clk->name, "uclk0") == 0) {
+                ucon &= ~S3C6400_UCON_CLKMASK;
+                ucon |= S3C6400_UCON_UCLK0;
+        } else if (strcmp(clk->name, "uclk1") == 0)
+                ucon |= S3C6400_UCON_UCLK1;
+        else if (strcmp(clk->name, "pclk") == 0) {
+                /* See notes about transitioning from UCLK to PCLK */
+                ucon &= ~S3C6400_UCON_UCLK0;
+        } else {
+                printk(KERN_ERR "unknown clock source %s\n", clk->name);
+                return -EINVAL;
+        }
+
+        wr_regl(port, S3C2410_UCON, ucon);
+        return 0;
+}
+
+
+static int s3c6400_serial_getsource(struct uart_port *port,
+                                    struct s3c24xx_uart_clksrc *clk)
+{
+        u32 ucon = rd_regl(port, S3C2410_UCON);
+
+        clk->divisor = 1;
+
+        switch (ucon & S3C6400_UCON_CLKMASK) {
+        case S3C6400_UCON_UCLK0:
+                clk->name = "uclk0";
+                break;
+
+        case S3C6400_UCON_UCLK1:
+                clk->name = "uclk1";
+                break;
+
+        case S3C6400_UCON_PCLK:
+        case S3C6400_UCON_PCLK2:
+                clk->name = "pclk";
+                break;
+        }
+
+        return 0;
+}
+
+static int s3c6400_serial_resetport(struct uart_port *port,
+                                    struct s3c2410_uartcfg *cfg)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        dbg("s3c6400_serial_resetport: port=%p (%08lx), cfg=%p\n",
+            port, port->mapbase, cfg);
+
+        /* ensure we don't change the clock settings... */
+
+        ucon &= S3C6400_UCON_CLKMASK;
+
+        wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
+        wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+        /* reset both fifos */
+
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+        return 0;
+}
+
+static struct s3c24xx_uart_info s3c6400_uart_inf = {
+        .name           = "Samsung S3C6400 UART",
+        .type           = PORT_S3C6400,
+        .fifosize       = 64,
+        .has_divslot    = 1,
+        .rx_fifomask    = S3C2440_UFSTAT_RXMASK,
+        .rx_fifoshift   = S3C2440_UFSTAT_RXSHIFT,
+        .rx_fifofull    = S3C2440_UFSTAT_RXFULL,
+        .tx_fifofull    = S3C2440_UFSTAT_TXFULL,
+        .tx_fifomask    = S3C2440_UFSTAT_TXMASK,
+        .tx_fifoshift   = S3C2440_UFSTAT_TXSHIFT,
+        .get_clksrc     = s3c6400_serial_getsource,
+        .set_clksrc     = s3c6400_serial_setsource,
+        .reset_port     = s3c6400_serial_resetport,
+};
+
+/* device management */
+
+static int s3c6400_serial_probe(struct platform_device *dev)
+{
+        dbg("s3c6400_serial_probe: dev=%p\n", dev);
+        return s3c24xx_serial_probe(dev, &s3c6400_uart_inf);
+}
+
+static struct platform_driver s3c6400_serial_driver = {
+        .probe          = s3c6400_serial_probe,
+        .remove         = __devexit_p(s3c24xx_serial_remove),
+        .driver         = {
+                .name   = "s3c6400-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+s3c24xx_console_init(&s3c6400_serial_driver, &s3c6400_uart_inf);
+
+static int __init s3c6400_serial_init(void)
+{
+        return s3c24xx_serial_init(&s3c6400_serial_driver, &s3c6400_uart_inf);
+}
+
+static void __exit s3c6400_serial_exit(void)
+{
+        platform_driver_unregister(&s3c6400_serial_driver);
+}
+
+module_init(s3c6400_serial_init);
+module_exit(s3c6400_serial_exit);
+
+MODULE_DESCRIPTION("Samsung S3C6400,S3C6410 SoC Serial port driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:s3c6400-uart");
diff --git a/drivers/tty/serial/s5pv210.c b/drivers/tty/serial/s5pv210.c
new file mode 100644
index 000000000000..dd194dc80ee9
--- /dev/null
+++ b/drivers/tty/serial/s5pv210.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com/
+ *
+ * Based on drivers/serial/s3c6400.c
+ *
+ * Driver for Samsung S5PV210 SoC UARTs.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <plat/regs-serial.h>
+#include "samsung.h"
+
+static int s5pv210_serial_setsource(struct uart_port *port,
+                                        struct s3c24xx_uart_clksrc *clk)
+{
+        struct s3c2410_uartcfg *cfg = port->dev->platform_data;
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        if (cfg->flags & NO_NEED_CHECK_CLKSRC)
+                return 0;
+
+        if (strcmp(clk->name, "pclk") == 0)
+                ucon &= ~S5PV210_UCON_CLKMASK;
+        else if (strcmp(clk->name, "uclk1") == 0)
+                ucon |= S5PV210_UCON_CLKMASK;
+        else {
+                printk(KERN_ERR "unknown clock source %s\n", clk->name);
+                return -EINVAL;
+        }
+
+        wr_regl(port, S3C2410_UCON, ucon);
+        return 0;
+}
+
+
+static int s5pv210_serial_getsource(struct uart_port *port,
+                                        struct s3c24xx_uart_clksrc *clk)
+{
+        struct s3c2410_uartcfg *cfg = port->dev->platform_data;
+        u32 ucon = rd_regl(port, S3C2410_UCON);
+
+        clk->divisor = 1;
+
+        if (cfg->flags & NO_NEED_CHECK_CLKSRC)
+                return 0;
+
+        switch (ucon & S5PV210_UCON_CLKMASK) {
+        case S5PV210_UCON_PCLK:
+                clk->name = "pclk";
+                break;
+        case S5PV210_UCON_UCLK:
+                clk->name = "uclk1";
+                break;
+        }
+
+        return 0;
+}
+
+static int s5pv210_serial_resetport(struct uart_port *port,
+                                        struct s3c2410_uartcfg *cfg)
+{
+        unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+        ucon &= S5PV210_UCON_CLKMASK;
+        wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
+        wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+        /* reset both fifos */
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+        wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+        return 0;
+}
+
+#define S5PV210_UART_DEFAULT_INFO(fifo_size)                    \
+                .name           = "Samsung S5PV210 UART0",      \
+                .type           = PORT_S3C6400,                 \
+                .fifosize       = fifo_size,                    \
+                .has_divslot    = 1,                            \
+                .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
+                .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
+                .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
+                .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
+                .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
+                .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
+                .get_clksrc     = s5pv210_serial_getsource,     \
+                .set_clksrc     = s5pv210_serial_setsource,     \
+                .reset_port     = s5pv210_serial_resetport
+
+static struct s3c24xx_uart_info s5p_port_fifo256 = {
+        S5PV210_UART_DEFAULT_INFO(256),
+};
+
+static struct s3c24xx_uart_info s5p_port_fifo64 = {
+        S5PV210_UART_DEFAULT_INFO(64),
+};
+
+static struct s3c24xx_uart_info s5p_port_fifo16 = {
+        S5PV210_UART_DEFAULT_INFO(16),
+};
+
+static struct s3c24xx_uart_info *s5p_uart_inf[] = {
+        [0] = &s5p_port_fifo256,
+        [1] = &s5p_port_fifo64,
+        [2] = &s5p_port_fifo16,
+        [3] = &s5p_port_fifo16,
+};
+
+/* device management */
+static int s5p_serial_probe(struct platform_device *pdev)
+{
+        return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
+}
+
+static struct platform_driver s5p_serial_driver = {
+        .probe          = s5p_serial_probe,
+        .remove         = __devexit_p(s3c24xx_serial_remove),
+        .driver         = {
+                .name   = "s5pv210-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init s5pv210_serial_console_init(void)
+{
+        return s3c24xx_serial_initconsole(&s5p_serial_driver, s5p_uart_inf);
+}
+
+console_initcall(s5pv210_serial_console_init);
+
+static int __init s5p_serial_init(void)
+{
+        return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
+}
+
+static void __exit s5p_serial_exit(void)
+{
+        platform_driver_unregister(&s5p_serial_driver);
+}
+
+module_init(s5p_serial_init);
+module_exit(s5p_serial_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s5pv210-uart");
+MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
+MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");
diff --git a/drivers/tty/serial/sa1100.c b/drivers/tty/serial/sa1100.c
new file mode 100644
index 000000000000..ef7a21a6a01b
--- /dev/null
+++ b/drivers/tty/serial/sa1100.c
@@ -0,0 +1,916 @@
+/*
+ *  Driver for SA11x0 serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright (C) 2000 Deep Blue Solutions Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/io.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <asm/mach/serial_sa1100.h>
+
+/* We've been assigned a range on the "Low-density serial ports" major */
+#define SERIAL_SA1100_MAJOR     204
+#define MINOR_START             5
+
+#define NR_PORTS                3
+
+#define SA1100_ISR_PASS_LIMIT   256
+
+/*
+ * Convert from ignore_status_mask or read_status_mask to UTSR[01]
+ */
+#define SM_TO_UTSR0(x)  ((x) & 0xff)
+#define SM_TO_UTSR1(x)  ((x) >> 8)
+#define UTSR0_TO_SM(x)  ((x))
+#define UTSR1_TO_SM(x)  ((x) << 8)
+
+#define UART_GET_UTCR0(sport)   __raw_readl((sport)->port.membase + UTCR0)
+#define UART_GET_UTCR1(sport)   __raw_readl((sport)->port.membase + UTCR1)
+#define UART_GET_UTCR2(sport)   __raw_readl((sport)->port.membase + UTCR2)
+#define UART_GET_UTCR3(sport)   __raw_readl((sport)->port.membase + UTCR3)
+#define UART_GET_UTSR0(sport)   __raw_readl((sport)->port.membase + UTSR0)
+#define UART_GET_UTSR1(sport)   __raw_readl((sport)->port.membase + UTSR1)
+#define UART_GET_CHAR(sport)    __raw_readl((sport)->port.membase + UTDR)
+
+#define UART_PUT_UTCR0(sport,v) __raw_writel((v),(sport)->port.membase + UTCR0)
+#define UART_PUT_UTCR1(sport,v) __raw_writel((v),(sport)->port.membase + UTCR1)
+#define UART_PUT_UTCR2(sport,v) __raw_writel((v),(sport)->port.membase + UTCR2)
+#define UART_PUT_UTCR3(sport,v) __raw_writel((v),(sport)->port.membase + UTCR3)
+#define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)
+#define UART_PUT_UTSR1(sport,v) __raw_writel((v),(sport)->port.membase + UTSR1)
+#define UART_PUT_CHAR(sport,v)  __raw_writel((v),(sport)->port.membase + UTDR)
+
+/*
+ * This is the size of our serial port register set.
+ */
+#define UART_PORT_SIZE  0x24
+
+/*
+ * This determines how often we check the modem status signals
+ * for any change.  They generally aren't connected to an IRQ
+ * so we have to poll them.  We also check immediately before
+ * filling the TX fifo incase CTS has been dropped.
+ */
+#define MCTRL_TIMEOUT   (250*HZ/1000)
+
+struct sa1100_port {
+        struct uart_port        port;
+        struct timer_list       timer;
+        unsigned int            old_status;
+};
+
+/*
+ * Handle any change of modem status signal since we were last called.
+ */
+static void sa1100_mctrl_check(struct sa1100_port *sport)
+{
+        unsigned int status, changed;
+
+        status = sport->port.ops->get_mctrl(&sport->port);
+        changed = status ^ sport->old_status;
+
+        if (changed == 0)
+                return;
+
+        sport->old_status = status;
+
+        if (changed & TIOCM_RI)
+                sport->port.icount.rng++;
+        if (changed & TIOCM_DSR)
+                sport->port.icount.dsr++;
+        if (changed & TIOCM_CAR)
+                uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
+        if (changed & TIOCM_CTS)
+                uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
+
+        wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
+}
+
+/*
+ * This is our per-port timeout handler, for checking the
+ * modem status signals.
+ */
+static void sa1100_timeout(unsigned long data)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)data;
+        unsigned long flags;
+
+        if (sport->port.state) {
+                spin_lock_irqsave(&sport->port.lock, flags);
+                sa1100_mctrl_check(sport);
+                spin_unlock_irqrestore(&sport->port.lock, flags);
+
+                mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
+        }
+}
+
+/*
+ * interrupts disabled on entry
+ */
+static void sa1100_stop_tx(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+        u32 utcr3;
+
+        utcr3 = UART_GET_UTCR3(sport);
+        UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
+        sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
+}
+
+/*
+ * port locked and interrupts disabled
+ */
+static void sa1100_start_tx(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+        u32 utcr3;
+
+        utcr3 = UART_GET_UTCR3(sport);
+        sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
+        UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
+}
+
+/*
+ * Interrupts enabled
+ */
+static void sa1100_stop_rx(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+        u32 utcr3;
+
+        utcr3 = UART_GET_UTCR3(sport);
+        UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
+}
+
+/*
+ * Set the modem control timer to fire immediately.
+ */
+static void sa1100_enable_ms(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        mod_timer(&sport->timer, jiffies);
+}
+
+static void
+sa1100_rx_chars(struct sa1100_port *sport)
+{
+        struct tty_struct *tty = sport->port.state->port.tty;
+        unsigned int status, ch, flg;
+
+        status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
+                 UTSR0_TO_SM(UART_GET_UTSR0(sport));
+        while (status & UTSR1_TO_SM(UTSR1_RNE)) {
+                ch = UART_GET_CHAR(sport);
+
+                sport->port.icount.rx++;
+
+                flg = TTY_NORMAL;
+
+                /*
+                 * note that the error handling code is
+                 * out of the main execution path
+                 */
+                if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
+                        if (status & UTSR1_TO_SM(UTSR1_PRE))
+                                sport->port.icount.parity++;
+                        else if (status & UTSR1_TO_SM(UTSR1_FRE))
+                                sport->port.icount.frame++;
+                        if (status & UTSR1_TO_SM(UTSR1_ROR))
+                                sport->port.icount.overrun++;
+
+                        status &= sport->port.read_status_mask;
+
+                        if (status & UTSR1_TO_SM(UTSR1_PRE))
+                                flg = TTY_PARITY;
+                        else if (status & UTSR1_TO_SM(UTSR1_FRE))
+                                flg = TTY_FRAME;
+
+#ifdef SUPPORT_SYSRQ
+                        sport->port.sysrq = 0;
+#endif
+                }
+
+                if (uart_handle_sysrq_char(&sport->port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);
+
+        ignore_char:
+                status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
+                         UTSR0_TO_SM(UART_GET_UTSR0(sport));
+        }
+        tty_flip_buffer_push(tty);
+}
+
+static void sa1100_tx_chars(struct sa1100_port *sport)
+{
+        struct circ_buf *xmit = &sport->port.state->xmit;
+
+        if (sport->port.x_char) {
+                UART_PUT_CHAR(sport, sport->port.x_char);
+                sport->port.icount.tx++;
+                sport->port.x_char = 0;
+                return;
+        }
+
+        /*
+         * Check the modem control lines before
+         * transmitting anything.
+         */
+        sa1100_mctrl_check(sport);
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
+                sa1100_stop_tx(&sport->port);
+                return;
+        }
+
+        /*
+         * Tried using FIFO (not checking TNF) for fifo fill:
+         * still had the '4 bytes repeated' problem.
+         */
+        while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
+                UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                sport->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&sport->port);
+
+        if (uart_circ_empty(xmit))
+                sa1100_stop_tx(&sport->port);
+}
+
+static irqreturn_t sa1100_int(int irq, void *dev_id)
+{
+        struct sa1100_port *sport = dev_id;
+        unsigned int status, pass_counter = 0;
+
+        spin_lock(&sport->port.lock);
+        status = UART_GET_UTSR0(sport);
+        status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
+        do {
+                if (status & (UTSR0_RFS | UTSR0_RID)) {
+                        /* Clear the receiver idle bit, if set */
+                        if (status & UTSR0_RID)
+                                UART_PUT_UTSR0(sport, UTSR0_RID);
+                        sa1100_rx_chars(sport);
+                }
+
+                /* Clear the relevant break bits */
+                if (status & (UTSR0_RBB | UTSR0_REB))
+                        UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));
+
+                if (status & UTSR0_RBB)
+                        sport->port.icount.brk++;
+
+                if (status & UTSR0_REB)
+                        uart_handle_break(&sport->port);
+
+                if (status & UTSR0_TFS)
+                        sa1100_tx_chars(sport);
+                if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
+                        break;
+                status = UART_GET_UTSR0(sport);
+                status &= SM_TO_UTSR0(sport->port.read_status_mask) |
+                          ~UTSR0_TFS;
+        } while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
+        spin_unlock(&sport->port.lock);
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * Return TIOCSER_TEMT when transmitter is not busy.
+ */
+static unsigned int sa1100_tx_empty(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
+}
+
+static unsigned int sa1100_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+/*
+ * Interrupts always disabled.
+ */
+static void sa1100_break_ctl(struct uart_port *port, int break_state)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+        unsigned long flags;
+        unsigned int utcr3;
+
+        spin_lock_irqsave(&sport->port.lock, flags);
+        utcr3 = UART_GET_UTCR3(sport);
+        if (break_state == -1)
+                utcr3 |= UTCR3_BRK;
+        else
+                utcr3 &= ~UTCR3_BRK;
+        UART_PUT_UTCR3(sport, utcr3);
+        spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static int sa1100_startup(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+        int retval;
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(sport->port.irq, sa1100_int, 0,
+                             "sa11x0-uart", sport);
+        if (retval)
+                return retval;
+
+        /*
+         * Finally, clear and enable interrupts
+         */
+        UART_PUT_UTSR0(sport, -1);
+        UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);
+
+        /*
+         * Enable modem status interrupts
+         */
+        spin_lock_irq(&sport->port.lock);
+        sa1100_enable_ms(&sport->port);
+        spin_unlock_irq(&sport->port.lock);
+
+        return 0;
+}
+
+static void sa1100_shutdown(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        /*
+         * Stop our timer.
+         */
+        del_timer_sync(&sport->timer);
+
+        /*
+         * Free the interrupt
+         */
+        free_irq(sport->port.irq, sport);
+
+        /*
+         * Disable all interrupts, port and break condition.
+         */
+        UART_PUT_UTCR3(sport, 0);
+}
+
+static void
+sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
+                   struct ktermios *old)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+        unsigned long flags;
+        unsigned int utcr0, old_utcr3, baud, quot;
+        unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
+
+        /*
+         * We only support CS7 and CS8.
+         */
+        while ((termios->c_cflag & CSIZE) != CS7 &&
+               (termios->c_cflag & CSIZE) != CS8) {
+                termios->c_cflag &= ~CSIZE;
+                termios->c_cflag |= old_csize;
+                old_csize = CS8;
+        }
+
+        if ((termios->c_cflag & CSIZE) == CS8)
+                utcr0 = UTCR0_DSS;
+        else
+                utcr0 = 0;
+
+        if (termios->c_cflag & CSTOPB)
+                utcr0 |= UTCR0_SBS;
+        if (termios->c_cflag & PARENB) {
+                utcr0 |= UTCR0_PE;
+                if (!(termios->c_cflag & PARODD))
+                        utcr0 |= UTCR0_OES;
+        }
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+        quot = uart_get_divisor(port, baud);
+
+        spin_lock_irqsave(&sport->port.lock, flags);
+
+        sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
+        sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
+        if (termios->c_iflag & INPCK)
+                sport->port.read_status_mask |=
+                                UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                sport->port.read_status_mask |=
+                                UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
+
+        /*
+         * Characters to ignore
+         */
+        sport->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                sport->port.ignore_status_mask |=
+                                UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
+        if (termios->c_iflag & IGNBRK) {
+                sport->port.ignore_status_mask |=
+                                UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        sport->port.ignore_status_mask |=
+                                UTSR1_TO_SM(UTSR1_ROR);
+        }
+
+        del_timer_sync(&sport->timer);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /*
+         * disable interrupts and drain transmitter
+         */
+        old_utcr3 = UART_GET_UTCR3(sport);
+        UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));
+
+        while (UART_GET_UTSR1(sport) & UTSR1_TBY)
+                barrier();
+
+        /* then, disable everything */
+        UART_PUT_UTCR3(sport, 0);
+
+        /* set the parity, stop bits and data size */
+        UART_PUT_UTCR0(sport, utcr0);
+
+        /* set the baud rate */
+        quot -= 1;
+        UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
+        UART_PUT_UTCR2(sport, (quot & 0xff));
+
+        UART_PUT_UTSR0(sport, -1);
+
+        UART_PUT_UTCR3(sport, old_utcr3);
+
+        if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
+                sa1100_enable_ms(&sport->port);
+
+        spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
+static const char *sa1100_type(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'.
+ */
+static void sa1100_release_port(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'.
+ */
+static int sa1100_request_port(struct uart_port *port)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
+                        "sa11x0-uart") != NULL ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void sa1100_config_port(struct uart_port *port, int flags)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        if (flags & UART_CONFIG_TYPE &&
+            sa1100_request_port(&sport->port) == 0)
+                sport->port.type = PORT_SA1100;
+}
+
+/*
+ * Verify the new serial_struct (for TIOCSSERIAL).
+ * The only change we allow are to the flags and type, and
+ * even then only between PORT_SA1100 and PORT_UNKNOWN
+ */
+static int
+sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
+                ret = -EINVAL;
+        if (sport->port.irq != ser->irq)
+                ret = -EINVAL;
+        if (ser->io_type != SERIAL_IO_MEM)
+                ret = -EINVAL;
+        if (sport->port.uartclk / 16 != ser->baud_base)
+                ret = -EINVAL;
+        if ((void *)sport->port.mapbase != ser->iomem_base)
+                ret = -EINVAL;
+        if (sport->port.iobase != ser->port)
+                ret = -EINVAL;
+        if (ser->hub6 != 0)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops sa1100_pops = {
+        .tx_empty       = sa1100_tx_empty,
+        .set_mctrl      = sa1100_set_mctrl,
+        .get_mctrl      = sa1100_get_mctrl,
+        .stop_tx        = sa1100_stop_tx,
+        .start_tx       = sa1100_start_tx,
+        .stop_rx        = sa1100_stop_rx,
+        .enable_ms      = sa1100_enable_ms,
+        .break_ctl      = sa1100_break_ctl,
+        .startup        = sa1100_startup,
+        .shutdown       = sa1100_shutdown,
+        .set_termios    = sa1100_set_termios,
+        .type           = sa1100_type,
+        .release_port   = sa1100_release_port,
+        .request_port   = sa1100_request_port,
+        .config_port    = sa1100_config_port,
+        .verify_port    = sa1100_verify_port,
+};
+
+static struct sa1100_port sa1100_ports[NR_PORTS];
+
+/*
+ * Setup the SA1100 serial ports.  Note that we don't include the IrDA
+ * port here since we have our own SIR/FIR driver (see drivers/net/irda)
+ *
+ * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
+ * Which serial port this ends up being depends on the machine you're
+ * running this kernel on.  I'm not convinced that this is a good idea,
+ * but that's the way it traditionally works.
+ *
+ * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
+ * used here.
+ */
+static void __init sa1100_init_ports(void)
+{
+        static int first = 1;
+        int i;
+
+        if (!first)
+                return;
+        first = 0;
+
+        for (i = 0; i < NR_PORTS; i++) {
+                sa1100_ports[i].port.uartclk   = 3686400;
+                sa1100_ports[i].port.ops       = &sa1100_pops;
+                sa1100_ports[i].port.fifosize  = 8;
+                sa1100_ports[i].port.line      = i;
+                sa1100_ports[i].port.iotype    = UPIO_MEM;
+                init_timer(&sa1100_ports[i].timer);
+                sa1100_ports[i].timer.function = sa1100_timeout;
+                sa1100_ports[i].timer.data     = (unsigned long)&sa1100_ports[i];
+        }
+
+        /*
+         * make transmit lines outputs, so that when the port
+         * is closed, the output is in the MARK state.
+         */
+        PPDR |= PPC_TXD1 | PPC_TXD3;
+        PPSR |= PPC_TXD1 | PPC_TXD3;
+}
+
+void __devinit sa1100_register_uart_fns(struct sa1100_port_fns *fns)
+{
+        if (fns->get_mctrl)
+                sa1100_pops.get_mctrl = fns->get_mctrl;
+        if (fns->set_mctrl)
+                sa1100_pops.set_mctrl = fns->set_mctrl;
+
+        sa1100_pops.pm       = fns->pm;
+        sa1100_pops.set_wake = fns->set_wake;
+}
+
+void __init sa1100_register_uart(int idx, int port)
+{
+        if (idx >= NR_PORTS) {
+                printk(KERN_ERR "%s: bad index number %d\n", __func__, idx);
+                return;
+        }
+
+        switch (port) {
+        case 1:
+                sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
+                sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
+                sa1100_ports[idx].port.irq     = IRQ_Ser1UART;
+                sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
+                break;
+
+        case 2:
+                sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
+                sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
+                sa1100_ports[idx].port.irq     = IRQ_Ser2ICP;
+                sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
+                break;
+
+        case 3:
+                sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
+                sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
+                sa1100_ports[idx].port.irq     = IRQ_Ser3UART;
+                sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
+                break;
+
+        default:
+                printk(KERN_ERR "%s: bad port number %d\n", __func__, port);
+        }
+}
+
+
+#ifdef CONFIG_SERIAL_SA1100_CONSOLE
+static void sa1100_console_putchar(struct uart_port *port, int ch)
+{
+        struct sa1100_port *sport = (struct sa1100_port *)port;
+
+        while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
+                barrier();
+        UART_PUT_CHAR(sport, ch);
+}
+
+/*
+ * Interrupts are disabled on entering
+ */
+static void
+sa1100_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct sa1100_port *sport = &sa1100_ports[co->index];
+        unsigned int old_utcr3, status;
+
+        /*
+         *      First, save UTCR3 and then disable interrupts
+         */
+        old_utcr3 = UART_GET_UTCR3(sport);
+        UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
+                                UTCR3_TXE);
+
+        uart_console_write(&sport->port, s, count, sa1100_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore UTCR3
+         */
+        do {
+                status = UART_GET_UTSR1(sport);
+        } while (status & UTSR1_TBY);
+        UART_PUT_UTCR3(sport, old_utcr3);
+}
+
+/*
+ * If the port was already initialised (eg, by a boot loader),
+ * try to determine the current setup.
+ */
+static void __init
+sa1100_console_get_options(struct sa1100_port *sport, int *baud,
+                           int *parity, int *bits)
+{
+        unsigned int utcr3;
+
+        utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
+        if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
+                /* ok, the port was enabled */
+                unsigned int utcr0, quot;
+
+                utcr0 = UART_GET_UTCR0(sport);
+
+                *parity = 'n';
+                if (utcr0 & UTCR0_PE) {
+                        if (utcr0 & UTCR0_OES)
+                                *parity = 'e';
+                        else
+                                *parity = 'o';
+                }
+
+                if (utcr0 & UTCR0_DSS)
+                        *bits = 8;
+                else
+                        *bits = 7;
+
+                quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
+                quot &= 0xfff;
+                *baud = sport->port.uartclk / (16 * (quot + 1));
+        }
+}
+
+static int __init
+sa1100_console_setup(struct console *co, char *options)
+{
+        struct sa1100_port *sport;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index == -1 || co->index >= NR_PORTS)
+                co->index = 0;
+        sport = &sa1100_ports[co->index];
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                sa1100_console_get_options(sport, &baud, &parity, &bits);
+
+        return uart_set_options(&sport->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver sa1100_reg;
+static struct console sa1100_console = {
+        .name           = "ttySA",
+        .write          = sa1100_console_write,
+        .device         = uart_console_device,
+        .setup          = sa1100_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &sa1100_reg,
+};
+
+static int __init sa1100_rs_console_init(void)
+{
+        sa1100_init_ports();
+        register_console(&sa1100_console);
+        return 0;
+}
+console_initcall(sa1100_rs_console_init);
+
+#define SA1100_CONSOLE  &sa1100_console
+#else
+#define SA1100_CONSOLE  NULL
+#endif
+
+static struct uart_driver sa1100_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "ttySA",
+        .dev_name               = "ttySA",
+        .major                  = SERIAL_SA1100_MAJOR,
+        .minor                  = MINOR_START,
+        .nr                     = NR_PORTS,
+        .cons                   = SA1100_CONSOLE,
+};
+
+static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
+{
+        struct sa1100_port *sport = platform_get_drvdata(dev);
+
+        if (sport)
+                uart_suspend_port(&sa1100_reg, &sport->port);
+
+        return 0;
+}
+
+static int sa1100_serial_resume(struct platform_device *dev)
+{
+        struct sa1100_port *sport = platform_get_drvdata(dev);
+
+        if (sport)
+                uart_resume_port(&sa1100_reg, &sport->port);
+
+        return 0;
+}
+
+static int sa1100_serial_probe(struct platform_device *dev)
+{
+        struct resource *res = dev->resource;
+        int i;
+
+        for (i = 0; i < dev->num_resources; i++, res++)
+                if (res->flags & IORESOURCE_MEM)
+                        break;
+
+        if (i < dev->num_resources) {
+                for (i = 0; i < NR_PORTS; i++) {
+                        if (sa1100_ports[i].port.mapbase != res->start)
+                                continue;
+
+                        sa1100_ports[i].port.dev = &dev->dev;
+                        uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
+                        platform_set_drvdata(dev, &sa1100_ports[i]);
+                        break;
+                }
+        }
+
+        return 0;
+}
+
+static int sa1100_serial_remove(struct platform_device *pdev)
+{
+        struct sa1100_port *sport = platform_get_drvdata(pdev);
+
+        platform_set_drvdata(pdev, NULL);
+
+        if (sport)
+                uart_remove_one_port(&sa1100_reg, &sport->port);
+
+        return 0;
+}
+
+static struct platform_driver sa11x0_serial_driver = {
+        .probe          = sa1100_serial_probe,
+        .remove         = sa1100_serial_remove,
+        .suspend        = sa1100_serial_suspend,
+        .resume         = sa1100_serial_resume,
+        .driver         = {
+                .name   = "sa11x0-uart",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init sa1100_serial_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Serial: SA11x0 driver\n");
+
+        sa1100_init_ports();
+
+        ret = uart_register_driver(&sa1100_reg);
+        if (ret == 0) {
+                ret = platform_driver_register(&sa11x0_serial_driver);
+                if (ret)
+                        uart_unregister_driver(&sa1100_reg);
+        }
+        return ret;
+}
+
+static void __exit sa1100_serial_exit(void)
+{
+        platform_driver_unregister(&sa11x0_serial_driver);
+        uart_unregister_driver(&sa1100_reg);
+}
+
+module_init(sa1100_serial_init);
+module_exit(sa1100_serial_exit);
+
+MODULE_AUTHOR("Deep Blue Solutions Ltd");
+MODULE_DESCRIPTION("SA1100 generic serial port driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
+MODULE_ALIAS("platform:sa11x0-uart");
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
new file mode 100644
index 000000000000..f66f64829303
--- /dev/null
+++ b/drivers/tty/serial/samsung.c
@@ -0,0 +1,1486 @@
+/*
+ * Driver core for Samsung SoC onboard UARTs.
+ *
+ * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+/* Hote on 2410 error handling
+ *
+ * The s3c2410 manual has a love/hate affair with the contents of the
+ * UERSTAT register in the UART blocks, and keeps marking some of the
+ * error bits as reserved. Having checked with the s3c2410x01,
+ * it copes with BREAKs properly, so I am happy to ignore the RESERVED
+ * feature from the latter versions of the manual.
+ *
+ * If it becomes aparrent that latter versions of the 2410 remove these
+ * bits, then action will have to be taken to differentiate the versions
+ * and change the policy on BREAK
+ *
+ * BJD, 04-Nov-2004
+*/
+
+#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+
+#include <asm/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/map.h>
+
+#include <plat/regs-serial.h>
+
+#include "samsung.h"
+
+/* UART name and device definitions */
+
+#define S3C24XX_SERIAL_NAME     "ttySAC"
+#define S3C24XX_SERIAL_MAJOR    204
+#define S3C24XX_SERIAL_MINOR    64
+
+/* macros to change one thing to another */
+
+#define tx_enabled(port) ((port)->unused[0])
+#define rx_enabled(port) ((port)->unused[1])
+
+/* flag to ignore all characters coming in */
+#define RXSTAT_DUMMY_READ (0x10000000)
+
+static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
+{
+        return container_of(port, struct s3c24xx_uart_port, port);
+}
+
+/* translate a port to the device name */
+
+static inline const char *s3c24xx_serial_portname(struct uart_port *port)
+{
+        return to_platform_device(port->dev)->name;
+}
+
+static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
+{
+        return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
+}
+
+static void s3c24xx_serial_rx_enable(struct uart_port *port)
+{
+        unsigned long flags;
+        unsigned int ucon, ufcon;
+        int count = 10000;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        while (--count && !s3c24xx_serial_txempty_nofifo(port))
+                udelay(100);
+
+        ufcon = rd_regl(port, S3C2410_UFCON);
+        ufcon |= S3C2410_UFCON_RESETRX;
+        wr_regl(port, S3C2410_UFCON, ufcon);
+
+        ucon = rd_regl(port, S3C2410_UCON);
+        ucon |= S3C2410_UCON_RXIRQMODE;
+        wr_regl(port, S3C2410_UCON, ucon);
+
+        rx_enabled(port) = 1;
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void s3c24xx_serial_rx_disable(struct uart_port *port)
+{
+        unsigned long flags;
+        unsigned int ucon;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        ucon = rd_regl(port, S3C2410_UCON);
+        ucon &= ~S3C2410_UCON_RXIRQMODE;
+        wr_regl(port, S3C2410_UCON, ucon);
+
+        rx_enabled(port) = 0;
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void s3c24xx_serial_stop_tx(struct uart_port *port)
+{
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+        if (tx_enabled(port)) {
+                disable_irq_nosync(ourport->tx_irq);
+                tx_enabled(port) = 0;
+                if (port->flags & UPF_CONS_FLOW)
+                        s3c24xx_serial_rx_enable(port);
+        }
+}
+
+static void s3c24xx_serial_start_tx(struct uart_port *port)
+{
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+        if (!tx_enabled(port)) {
+                if (port->flags & UPF_CONS_FLOW)
+                        s3c24xx_serial_rx_disable(port);
+
+                enable_irq(ourport->tx_irq);
+                tx_enabled(port) = 1;
+        }
+}
+
+
+static void s3c24xx_serial_stop_rx(struct uart_port *port)
+{
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+        if (rx_enabled(port)) {
+                dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
+                disable_irq_nosync(ourport->rx_irq);
+                rx_enabled(port) = 0;
+        }
+}
+
+static void s3c24xx_serial_enable_ms(struct uart_port *port)
+{
+}
+
+static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
+{
+        return to_ourport(port)->info;
+}
+
+static inline struct s3c2410_uartcfg *s3c24xx_port_to_cfg(struct uart_port *port)
+{
+        if (port->dev == NULL)
+                return NULL;
+
+        return (struct s3c2410_uartcfg *)port->dev->platform_data;
+}
+
+static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
+                                     unsigned long ufstat)
+{
+        struct s3c24xx_uart_info *info = ourport->info;
+
+        if (ufstat & info->rx_fifofull)
+                return info->fifosize;
+
+        return (ufstat & info->rx_fifomask) >> info->rx_fifoshift;
+}
+
+
+/* ? - where has parity gone?? */
+#define S3C2410_UERSTAT_PARITY (0x1000)
+
+static irqreturn_t
+s3c24xx_serial_rx_chars(int irq, void *dev_id)
+{
+        struct s3c24xx_uart_port *ourport = dev_id;
+        struct uart_port *port = &ourport->port;
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned int ufcon, ch, flag, ufstat, uerstat;
+        int max_count = 64;
+
+        while (max_count-- > 0) {
+                ufcon = rd_regl(port, S3C2410_UFCON);
+                ufstat = rd_regl(port, S3C2410_UFSTAT);
+
+                if (s3c24xx_serial_rx_fifocnt(ourport, ufstat) == 0)
+                        break;
+
+                uerstat = rd_regl(port, S3C2410_UERSTAT);
+                ch = rd_regb(port, S3C2410_URXH);
+
+                if (port->flags & UPF_CONS_FLOW) {
+                        int txe = s3c24xx_serial_txempty_nofifo(port);
+
+                        if (rx_enabled(port)) {
+                                if (!txe) {
+                                        rx_enabled(port) = 0;
+                                        continue;
+                                }
+                        } else {
+                                if (txe) {
+                                        ufcon |= S3C2410_UFCON_RESETRX;
+                                        wr_regl(port, S3C2410_UFCON, ufcon);
+                                        rx_enabled(port) = 1;
+                                        goto out;
+                                }
+                                continue;
+                        }
+                }
+
+                /* insert the character into the buffer */
+
+                flag = TTY_NORMAL;
+                port->icount.rx++;
+
+                if (unlikely(uerstat & S3C2410_UERSTAT_ANY)) {
+                        dbg("rxerr: port ch=0x%02x, rxs=0x%08x\n",
+                            ch, uerstat);
+
+                        /* check for break */
+                        if (uerstat & S3C2410_UERSTAT_BREAK) {
+                                dbg("break!\n");
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                    goto ignore_char;
+                        }
+
+                        if (uerstat & S3C2410_UERSTAT_FRAME)
+                                port->icount.frame++;
+                        if (uerstat & S3C2410_UERSTAT_OVERRUN)
+                                port->icount.overrun++;
+
+                        uerstat &= port->read_status_mask;
+
+                        if (uerstat & S3C2410_UERSTAT_BREAK)
+                                flag = TTY_BREAK;
+                        else if (uerstat & S3C2410_UERSTAT_PARITY)
+                                flag = TTY_PARITY;
+                        else if (uerstat & (S3C2410_UERSTAT_FRAME |
+                                            S3C2410_UERSTAT_OVERRUN))
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(port, uerstat, S3C2410_UERSTAT_OVERRUN,
+                                 ch, flag);
+
+ ignore_char:
+                continue;
+        }
+        tty_flip_buffer_push(tty);
+
+ out:
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
+{
+        struct s3c24xx_uart_port *ourport = id;
+        struct uart_port *port = &ourport->port;
+        struct circ_buf *xmit = &port->state->xmit;
+        int count = 256;
+
+        if (port->x_char) {
+                wr_regb(port, S3C2410_UTXH, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+                goto out;
+        }
+
+        /* if there isn't anything more to transmit, or the uart is now
+         * stopped, disable the uart and exit
+        */
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                s3c24xx_serial_stop_tx(port);
+                goto out;
+        }
+
+        /* try and drain the buffer... */
+
+        while (!uart_circ_empty(xmit) && count-- > 0) {
+                if (rd_regl(port, S3C2410_UFSTAT) & ourport->info->tx_fifofull)
+                        break;
+
+                wr_regb(port, S3C2410_UTXH, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                s3c24xx_serial_stop_tx(port);
+
+ out:
+        return IRQ_HANDLED;
+}
+
+static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
+{
+        struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+        unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
+        unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
+
+        if (ufcon & S3C2410_UFCON_FIFOMODE) {
+                if ((ufstat & info->tx_fifomask) != 0 ||
+                    (ufstat & info->tx_fifofull))
+                        return 0;
+
+                return 1;
+        }
+
+        return s3c24xx_serial_txempty_nofifo(port);
+}
+
+/* no modem control lines */
+static unsigned int s3c24xx_serial_get_mctrl(struct uart_port *port)
+{
+        unsigned int umstat = rd_regb(port, S3C2410_UMSTAT);
+
+        if (umstat & S3C2410_UMSTAT_CTS)
+                return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+        else
+                return TIOCM_CAR | TIOCM_DSR;
+}
+
+static void s3c24xx_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        /* todo - possibly remove AFC and do manual CTS */
+}
+
+static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state)
+{
+        unsigned long flags;
+        unsigned int ucon;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        ucon = rd_regl(port, S3C2410_UCON);
+
+        if (break_state)
+                ucon |= S3C2410_UCON_SBREAK;
+        else
+                ucon &= ~S3C2410_UCON_SBREAK;
+
+        wr_regl(port, S3C2410_UCON, ucon);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void s3c24xx_serial_shutdown(struct uart_port *port)
+{
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+        if (ourport->tx_claimed) {
+                free_irq(ourport->tx_irq, ourport);
+                tx_enabled(port) = 0;
+                ourport->tx_claimed = 0;
+        }
+
+        if (ourport->rx_claimed) {
+                free_irq(ourport->rx_irq, ourport);
+                ourport->rx_claimed = 0;
+                rx_enabled(port) = 0;
+        }
+}
+
+
+static int s3c24xx_serial_startup(struct uart_port *port)
+{
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+        int ret;
+
+        dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
+            port->mapbase, port->membase);
+
+        rx_enabled(port) = 1;
+
+        ret = request_irq(ourport->rx_irq, s3c24xx_serial_rx_chars, 0,
+                          s3c24xx_serial_portname(port), ourport);
+
+        if (ret != 0) {
+                printk(KERN_ERR "cannot get irq %d\n", ourport->rx_irq);
+                return ret;
+        }
+
+        ourport->rx_claimed = 1;
+
+        dbg("requesting tx irq...\n");
+
+        tx_enabled(port) = 1;
+
+        ret = request_irq(ourport->tx_irq, s3c24xx_serial_tx_chars, 0,
+                          s3c24xx_serial_portname(port), ourport);
+
+        if (ret) {
+                printk(KERN_ERR "cannot get irq %d\n", ourport->tx_irq);
+                goto err;
+        }
+
+        ourport->tx_claimed = 1;
+
+        dbg("s3c24xx_serial_startup ok\n");
+
+        /* the port reset code should have done the correct
+         * register setup for the port controls */
+
+        return ret;
+
+ err:
+        s3c24xx_serial_shutdown(port);
+        return ret;
+}
+
+/* power power management control */
+
+static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
+                              unsigned int old)
+{
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+        ourport->pm_level = level;
+
+        switch (level) {
+        case 3:
+                if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
+                        clk_disable(ourport->baudclk);
+
+                clk_disable(ourport->clk);
+                break;
+
+        case 0:
+                clk_enable(ourport->clk);
+
+                if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL)
+                        clk_enable(ourport->baudclk);
+
+                break;
+        default:
+                printk(KERN_ERR "s3c24xx_serial: unknown pm %d\n", level);
+        }
+}
+
+/* baud rate calculation
+ *
+ * The UARTs on the S3C2410/S3C2440 can take their clocks from a number
+ * of different sources, including the peripheral clock ("pclk") and an
+ * external clock ("uclk"). The S3C2440 also adds the core clock ("fclk")
+ * with a programmable extra divisor.
+ *
+ * The following code goes through the clock sources, and calculates the
+ * baud clocks (and the resultant actual baud rates) and then tries to
+ * pick the closest one and select that.
+ *
+*/
+
+
+#define MAX_CLKS (8)
+
+static struct s3c24xx_uart_clksrc tmp_clksrc = {
+        .name           = "pclk",
+        .min_baud       = 0,
+        .max_baud       = 0,
+        .divisor        = 1,
+};
+
+static inline int
+s3c24xx_serial_getsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
+{
+        struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+
+        return (info->get_clksrc)(port, c);
+}
+
+static inline int
+s3c24xx_serial_setsource(struct uart_port *port, struct s3c24xx_uart_clksrc *c)
+{
+        struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+
+        return (info->set_clksrc)(port, c);
+}
+
+struct baud_calc {
+        struct s3c24xx_uart_clksrc      *clksrc;
+        unsigned int                     calc;
+        unsigned int                     divslot;
+        unsigned int                     quot;
+        struct clk                      *src;
+};
+
+static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
+                                   struct uart_port *port,
+                                   struct s3c24xx_uart_clksrc *clksrc,
+                                   unsigned int baud)
+{
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+        unsigned long rate;
+
+        calc->src = clk_get(port->dev, clksrc->name);
+        if (calc->src == NULL || IS_ERR(calc->src))
+                return 0;
+
+        rate = clk_get_rate(calc->src);
+        rate /= clksrc->divisor;
+
+        calc->clksrc = clksrc;
+
+        if (ourport->info->has_divslot) {
+                unsigned long div = rate / baud;
+
+                /* The UDIVSLOT register on the newer UARTs allows us to
+                 * get a divisor adjustment of 1/16th on the baud clock.
+                 *
+                 * We don't keep the UDIVSLOT value (the 16ths we calculated
+                 * by not multiplying the baud by 16) as it is easy enough
+                 * to recalculate.
+                 */
+
+                calc->quot = div / 16;
+                calc->calc = rate / div;
+        } else {
+                calc->quot = (rate + (8 * baud)) / (16 * baud);
+                calc->calc = (rate / (calc->quot * 16));
+        }
+
+        calc->quot--;
+        return 1;
+}
+
+static unsigned int s3c24xx_serial_getclk(struct uart_port *port,
+                                          struct s3c24xx_uart_clksrc **clksrc,
+                                          struct clk **clk,
+                                          unsigned int baud)
+{
+        struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
+        struct s3c24xx_uart_clksrc *clkp;
+        struct baud_calc res[MAX_CLKS];
+        struct baud_calc *resptr, *best, *sptr;
+        int i;
+
+        clkp = cfg->clocks;
+        best = NULL;
+
+        if (cfg->clocks_size < 2) {
+                if (cfg->clocks_size == 0)
+                        clkp = &tmp_clksrc;
+
+                /* check to see if we're sourcing fclk, and if so we're
+                 * going to have to update the clock source
+                 */
+
+                if (strcmp(clkp->name, "fclk") == 0) {
+                        struct s3c24xx_uart_clksrc src;
+
+                        s3c24xx_serial_getsource(port, &src);
+
+                        /* check that the port already using fclk, and if
+                         * not, then re-select fclk
+                         */
+
+                        if (strcmp(src.name, clkp->name) == 0) {
+                                s3c24xx_serial_setsource(port, clkp);
+                                s3c24xx_serial_getsource(port, &src);
+                        }
+
+                        clkp->divisor = src.divisor;
+                }
+
+                s3c24xx_serial_calcbaud(res, port, clkp, baud);
+                best = res;
+                resptr = best + 1;
+        } else {
+                resptr = res;
+
+                for (i = 0; i < cfg->clocks_size; i++, clkp++) {
+                        if (s3c24xx_serial_calcbaud(resptr, port, clkp, baud))
+                                resptr++;
+                }
+        }
+
+        /* ok, we now need to select the best clock we found */
+
+        if (!best) {
+                unsigned int deviation = (1<<30)|((1<<30)-1);
+                int calc_deviation;
+
+                for (sptr = res; sptr < resptr; sptr++) {
+                        calc_deviation = baud - sptr->calc;
+                        if (calc_deviation < 0)
+                                calc_deviation = -calc_deviation;
+
+                        if (calc_deviation < deviation) {
+                                best = sptr;
+                                deviation = calc_deviation;
+                        }
+                }
+        }
+
+        /* store results to pass back */
+
+        *clksrc = best->clksrc;
+        *clk    = best->src;
+
+        return best->quot;
+}
+
+/* udivslot_table[]
+ *
+ * This table takes the fractional value of the baud divisor and gives
+ * the recommended setting for the UDIVSLOT register.
+ */
+static u16 udivslot_table[16] = {
+        [0] = 0x0000,
+        [1] = 0x0080,
+        [2] = 0x0808,
+        [3] = 0x0888,
+        [4] = 0x2222,
+        [5] = 0x4924,
+        [6] = 0x4A52,
+        [7] = 0x54AA,
+        [8] = 0x5555,
+        [9] = 0xD555,
+        [10] = 0xD5D5,
+        [11] = 0xDDD5,
+        [12] = 0xDDDD,
+        [13] = 0xDFDD,
+        [14] = 0xDFDF,
+        [15] = 0xFFDF,
+};
+
+static void s3c24xx_serial_set_termios(struct uart_port *port,
+                                       struct ktermios *termios,
+                                       struct ktermios *old)
+{
+        struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+        struct s3c24xx_uart_clksrc *clksrc = NULL;
+        struct clk *clk = NULL;
+        unsigned long flags;
+        unsigned int baud, quot;
+        unsigned int ulcon;
+        unsigned int umcon;
+        unsigned int udivslot = 0;
+
+        /*
+         * We don't support modem control lines.
+         */
+        termios->c_cflag &= ~(HUPCL | CMSPAR);
+        termios->c_cflag |= CLOCAL;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+
+        baud = uart_get_baud_rate(port, termios, old, 0, 115200*8);
+
+        if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
+                quot = port->custom_divisor;
+        else
+                quot = s3c24xx_serial_getclk(port, &clksrc, &clk, baud);
+
+        /* check to see if we need  to change clock source */
+
+        if (ourport->clksrc != clksrc || ourport->baudclk != clk) {
+                dbg("selecting clock %p\n", clk);
+                s3c24xx_serial_setsource(port, clksrc);
+
+                if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) {
+                        clk_disable(ourport->baudclk);
+                        ourport->baudclk  = NULL;
+                }
+
+                clk_enable(clk);
+
+                ourport->clksrc = clksrc;
+                ourport->baudclk = clk;
+                ourport->baudclk_rate = clk ? clk_get_rate(clk) : 0;
+        }
+
+        if (ourport->info->has_divslot) {
+                unsigned int div = ourport->baudclk_rate / baud;
+
+                if (cfg->has_fracval) {
+                        udivslot = (div & 15);
+                        dbg("fracval = %04x\n", udivslot);
+                } else {
+                        udivslot = udivslot_table[div & 15];
+                        dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
+                }
+        }
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                dbg("config: 5bits/char\n");
+                ulcon = S3C2410_LCON_CS5;
+                break;
+        case CS6:
+                dbg("config: 6bits/char\n");
+                ulcon = S3C2410_LCON_CS6;
+                break;
+        case CS7:
+                dbg("config: 7bits/char\n");
+                ulcon = S3C2410_LCON_CS7;
+                break;
+        case CS8:
+        default:
+                dbg("config: 8bits/char\n");
+                ulcon = S3C2410_LCON_CS8;
+                break;
+        }
+
+        /* preserve original lcon IR settings */
+        ulcon |= (cfg->ulcon & S3C2410_LCON_IRM);
+
+        if (termios->c_cflag & CSTOPB)
+                ulcon |= S3C2410_LCON_STOPB;
+
+        umcon = (termios->c_cflag & CRTSCTS) ? S3C2410_UMCOM_AFC : 0;
+
+        if (termios->c_cflag & PARENB) {
+                if (termios->c_cflag & PARODD)
+                        ulcon |= S3C2410_LCON_PODD;
+                else
+                        ulcon |= S3C2410_LCON_PEVEN;
+        } else {
+                ulcon |= S3C2410_LCON_PNONE;
+        }
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        dbg("setting ulcon to %08x, brddiv to %d, udivslot %08x\n",
+            ulcon, quot, udivslot);
+
+        wr_regl(port, S3C2410_ULCON, ulcon);
+        wr_regl(port, S3C2410_UBRDIV, quot);
+        wr_regl(port, S3C2410_UMCON, umcon);
+
+        if (ourport->info->has_divslot)
+                wr_regl(port, S3C2443_DIVSLOT, udivslot);
+
+        dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
+            rd_regl(port, S3C2410_ULCON),
+            rd_regl(port, S3C2410_UCON),
+            rd_regl(port, S3C2410_UFCON));
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /*
+         * Which character status flags are we interested in?
+         */
+        port->read_status_mask = S3C2410_UERSTAT_OVERRUN;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= S3C2410_UERSTAT_FRAME | S3C2410_UERSTAT_PARITY;
+
+        /*
+         * Which character status flags should we ignore?
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= S3C2410_UERSTAT_OVERRUN;
+        if (termios->c_iflag & IGNBRK && termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= S3C2410_UERSTAT_FRAME;
+
+        /*
+         * Ignore all characters if CREAD is not set.
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->ignore_status_mask |= RXSTAT_DUMMY_READ;
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *s3c24xx_serial_type(struct uart_port *port)
+{
+        switch (port->type) {
+        case PORT_S3C2410:
+                return "S3C2410";
+        case PORT_S3C2440:
+                return "S3C2440";
+        case PORT_S3C2412:
+                return "S3C2412";
+        case PORT_S3C6400:
+                return "S3C6400/10";
+        default:
+                return NULL;
+        }
+}
+
+#define MAP_SIZE (0x100)
+
+static void s3c24xx_serial_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, MAP_SIZE);
+}
+
+static int s3c24xx_serial_request_port(struct uart_port *port)
+{
+        const char *name = s3c24xx_serial_portname(port);
+        return request_mem_region(port->mapbase, MAP_SIZE, name) ? 0 : -EBUSY;
+}
+
+static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
+{
+        struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+
+        if (flags & UART_CONFIG_TYPE &&
+            s3c24xx_serial_request_port(port) == 0)
+                port->type = info->type;
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int
+s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+
+        if (ser->type != PORT_UNKNOWN && ser->type != info->type)
+                return -EINVAL;
+
+        return 0;
+}
+
+
+#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
+
+static struct console s3c24xx_serial_console;
+
+#define S3C24XX_SERIAL_CONSOLE &s3c24xx_serial_console
+#else
+#define S3C24XX_SERIAL_CONSOLE NULL
+#endif
+
+static struct uart_ops s3c24xx_serial_ops = {
+        .pm             = s3c24xx_serial_pm,
+        .tx_empty       = s3c24xx_serial_tx_empty,
+        .get_mctrl      = s3c24xx_serial_get_mctrl,
+        .set_mctrl      = s3c24xx_serial_set_mctrl,
+        .stop_tx        = s3c24xx_serial_stop_tx,
+        .start_tx       = s3c24xx_serial_start_tx,
+        .stop_rx        = s3c24xx_serial_stop_rx,
+        .enable_ms      = s3c24xx_serial_enable_ms,
+        .break_ctl      = s3c24xx_serial_break_ctl,
+        .startup        = s3c24xx_serial_startup,
+        .shutdown       = s3c24xx_serial_shutdown,
+        .set_termios    = s3c24xx_serial_set_termios,
+        .type           = s3c24xx_serial_type,
+        .release_port   = s3c24xx_serial_release_port,
+        .request_port   = s3c24xx_serial_request_port,
+        .config_port    = s3c24xx_serial_config_port,
+        .verify_port    = s3c24xx_serial_verify_port,
+};
+
+
+static struct uart_driver s3c24xx_uart_drv = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "s3c2410_serial",
+        .nr             = CONFIG_SERIAL_SAMSUNG_UARTS,
+        .cons           = S3C24XX_SERIAL_CONSOLE,
+        .dev_name       = S3C24XX_SERIAL_NAME,
+        .major          = S3C24XX_SERIAL_MAJOR,
+        .minor          = S3C24XX_SERIAL_MINOR,
+};
+
+static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
+        [0] = {
+                .port = {
+                        .lock           = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
+                        .iotype         = UPIO_MEM,
+                        .irq            = IRQ_S3CUART_RX0,
+                        .uartclk        = 0,
+                        .fifosize       = 16,
+                        .ops            = &s3c24xx_serial_ops,
+                        .flags          = UPF_BOOT_AUTOCONF,
+                        .line           = 0,
+                }
+        },
+        [1] = {
+                .port = {
+                        .lock           = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
+                        .iotype         = UPIO_MEM,
+                        .irq            = IRQ_S3CUART_RX1,
+                        .uartclk        = 0,
+                        .fifosize       = 16,
+                        .ops            = &s3c24xx_serial_ops,
+                        .flags          = UPF_BOOT_AUTOCONF,
+                        .line           = 1,
+                }
+        },
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 2
+
+        [2] = {
+                .port = {
+                        .lock           = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
+                        .iotype         = UPIO_MEM,
+                        .irq            = IRQ_S3CUART_RX2,
+                        .uartclk        = 0,
+                        .fifosize       = 16,
+                        .ops            = &s3c24xx_serial_ops,
+                        .flags          = UPF_BOOT_AUTOCONF,
+                        .line           = 2,
+                }
+        },
+#endif
+#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
+        [3] = {
+                .port = {
+                        .lock           = __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
+                        .iotype         = UPIO_MEM,
+                        .irq            = IRQ_S3CUART_RX3,
+                        .uartclk        = 0,
+                        .fifosize       = 16,
+                        .ops            = &s3c24xx_serial_ops,
+                        .flags          = UPF_BOOT_AUTOCONF,
+                        .line           = 3,
+                }
+        }
+#endif
+};
+
+/* s3c24xx_serial_resetport
+ *
+ * wrapper to call the specific reset for this port (reset the fifos
+ * and the settings)
+*/
+
+static inline int s3c24xx_serial_resetport(struct uart_port *port,
+                                           struct s3c2410_uartcfg *cfg)
+{
+        struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+
+        return (info->reset_port)(port, cfg);
+}
+
+
+#ifdef CONFIG_CPU_FREQ
+
+static int s3c24xx_serial_cpufreq_transition(struct notifier_block *nb,
+                                             unsigned long val, void *data)
+{
+        struct s3c24xx_uart_port *port;
+        struct uart_port *uport;
+
+        port = container_of(nb, struct s3c24xx_uart_port, freq_transition);
+        uport = &port->port;
+
+        /* check to see if port is enabled */
+
+        if (port->pm_level != 0)
+                return 0;
+
+        /* try and work out if the baudrate is changing, we can detect
+         * a change in rate, but we do not have support for detecting
+         * a disturbance in the clock-rate over the change.
+         */
+
+        if (IS_ERR(port->clk))
+                goto exit;
+
+        if (port->baudclk_rate == clk_get_rate(port->clk))
+                goto exit;
+
+        if (val == CPUFREQ_PRECHANGE) {
+                /* we should really shut the port down whilst the
+                 * frequency change is in progress. */
+
+        } else if (val == CPUFREQ_POSTCHANGE) {
+                struct ktermios *termios;
+                struct tty_struct *tty;
+
+                if (uport->state == NULL)
+                        goto exit;
+
+                tty = uport->state->port.tty;
+
+                if (tty == NULL)
+                        goto exit;
+
+                termios = tty->termios;
+
+                if (termios == NULL) {
+                        printk(KERN_WARNING "%s: no termios?\n", __func__);
+                        goto exit;
+                }
+
+                s3c24xx_serial_set_termios(uport, termios, NULL);
+        }
+
+ exit:
+        return 0;
+}
+
+static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
+{
+        port->freq_transition.notifier_call = s3c24xx_serial_cpufreq_transition;
+
+        return cpufreq_register_notifier(&port->freq_transition,
+                                         CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
+{
+        cpufreq_unregister_notifier(&port->freq_transition,
+                                    CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+#else
+static inline int s3c24xx_serial_cpufreq_register(struct s3c24xx_uart_port *port)
+{
+        return 0;
+}
+
+static inline void s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
+{
+}
+#endif
+
+/* s3c24xx_serial_init_port
+ *
+ * initialise a single serial port from the platform device given
+ */
+
+static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
+                                    struct s3c24xx_uart_info *info,
+                                    struct platform_device *platdev)
+{
+        struct uart_port *port = &ourport->port;
+        struct s3c2410_uartcfg *cfg;
+        struct resource *res;
+        int ret;
+
+        dbg("s3c24xx_serial_init_port: port=%p, platdev=%p\n", port, platdev);
+
+        if (platdev == NULL)
+                return -ENODEV;
+
+        cfg = s3c24xx_dev_to_cfg(&platdev->dev);
+
+        if (port->mapbase != 0)
+                return 0;
+
+        if (cfg->hwport > CONFIG_SERIAL_SAMSUNG_UARTS) {
+                printk(KERN_ERR "%s: port %d bigger than %d\n", __func__,
+                       cfg->hwport, CONFIG_SERIAL_SAMSUNG_UARTS);
+                return -ERANGE;
+        }
+
+        /* setup info for port */
+        port->dev       = &platdev->dev;
+        ourport->info   = info;
+
+        /* copy the info in from provided structure */
+        ourport->port.fifosize = info->fifosize;
+
+        dbg("s3c24xx_serial_init_port: %p (hw %d)...\n", port, cfg->hwport);
+
+        port->uartclk = 1;
+
+        if (cfg->uart_flags & UPF_CONS_FLOW) {
+                dbg("s3c24xx_serial_init_port: enabling flow control\n");
+                port->flags |= UPF_CONS_FLOW;
+        }
+
+        /* sort our the physical and virtual addresses for each UART */
+
+        res = platform_get_resource(platdev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
+                printk(KERN_ERR "failed to find memory resource for uart\n");
+                return -EINVAL;
+        }
+
+        dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
+
+        port->mapbase = res->start;
+        port->membase = S3C_VA_UART + (res->start & 0xfffff);
+        ret = platform_get_irq(platdev, 0);
+        if (ret < 0)
+                port->irq = 0;
+        else {
+                port->irq = ret;
+                ourport->rx_irq = ret;
+                ourport->tx_irq = ret + 1;
+        }
+        
+        ret = platform_get_irq(platdev, 1);
+        if (ret > 0)
+                ourport->tx_irq = ret;
+
+        ourport->clk    = clk_get(&platdev->dev, "uart");
+
+        dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
+            port->mapbase, port->membase, port->irq,
+            ourport->rx_irq, ourport->tx_irq, port->uartclk);
+
+        /* reset the fifos (and setup the uart) */
+        s3c24xx_serial_resetport(port, cfg);
+        return 0;
+}
+
+static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
+                                          struct device_attribute *attr,
+                                          char *buf)
+{
+        struct uart_port *port = s3c24xx_dev_to_port(dev);
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+        return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->clksrc->name);
+}
+
+static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);
+
+/* Device driver serial port probe */
+
+static int probe_index;
+
+int s3c24xx_serial_probe(struct platform_device *dev,
+                         struct s3c24xx_uart_info *info)
+{
+        struct s3c24xx_uart_port *ourport;
+        int ret;
+
+        dbg("s3c24xx_serial_probe(%p, %p) %d\n", dev, info, probe_index);
+
+        ourport = &s3c24xx_serial_ports[probe_index];
+        probe_index++;
+
+        dbg("%s: initialising port %p...\n", __func__, ourport);
+
+        ret = s3c24xx_serial_init_port(ourport, info, dev);
+        if (ret < 0)
+                goto probe_err;
+
+        dbg("%s: adding port\n", __func__);
+        uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
+        platform_set_drvdata(dev, &ourport->port);
+
+        ret = device_create_file(&dev->dev, &dev_attr_clock_source);
+        if (ret < 0)
+                printk(KERN_ERR "%s: failed to add clksrc attr.\n", __func__);
+
+        ret = s3c24xx_serial_cpufreq_register(ourport);
+        if (ret < 0)
+                dev_err(&dev->dev, "failed to add cpufreq notifier\n");
+
+        return 0;
+
+ probe_err:
+        return ret;
+}
+
+EXPORT_SYMBOL_GPL(s3c24xx_serial_probe);
+
+int __devexit s3c24xx_serial_remove(struct platform_device *dev)
+{
+        struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
+
+        if (port) {
+                s3c24xx_serial_cpufreq_deregister(to_ourport(port));
+                device_remove_file(&dev->dev, &dev_attr_clock_source);
+                uart_remove_one_port(&s3c24xx_uart_drv, port);
+        }
+
+        return 0;
+}
+
+EXPORT_SYMBOL_GPL(s3c24xx_serial_remove);
+
+/* UART power management code */
+
+#ifdef CONFIG_PM
+
+static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state)
+{
+        struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
+
+        if (port)
+                uart_suspend_port(&s3c24xx_uart_drv, port);
+
+        return 0;
+}
+
+static int s3c24xx_serial_resume(struct platform_device *dev)
+{
+        struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
+        struct s3c24xx_uart_port *ourport = to_ourport(port);
+
+        if (port) {
+                clk_enable(ourport->clk);
+                s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
+                clk_disable(ourport->clk);
+
+                uart_resume_port(&s3c24xx_uart_drv, port);
+        }
+
+        return 0;
+}
+#endif
+
+int s3c24xx_serial_init(struct platform_driver *drv,
+                        struct s3c24xx_uart_info *info)
+{
+        dbg("s3c24xx_serial_init(%p,%p)\n", drv, info);
+
+#ifdef CONFIG_PM
+        drv->suspend = s3c24xx_serial_suspend;
+        drv->resume = s3c24xx_serial_resume;
+#endif
+
+        return platform_driver_register(drv);
+}
+
+EXPORT_SYMBOL_GPL(s3c24xx_serial_init);
+
+/* module initialisation code */
+
+static int __init s3c24xx_serial_modinit(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&s3c24xx_uart_drv);
+        if (ret < 0) {
+                printk(KERN_ERR "failed to register UART driver\n");
+                return -1;
+        }
+
+        return 0;
+}
+
+static void __exit s3c24xx_serial_modexit(void)
+{
+        uart_unregister_driver(&s3c24xx_uart_drv);
+}
+
+module_init(s3c24xx_serial_modinit);
+module_exit(s3c24xx_serial_modexit);
+
+/* Console code */
+
+#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
+
+static struct uart_port *cons_uart;
+
+static int
+s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
+{
+        struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+        unsigned long ufstat, utrstat;
+
+        if (ufcon & S3C2410_UFCON_FIFOMODE) {
+                /* fifo mode - check amount of data in fifo registers... */
+
+                ufstat = rd_regl(port, S3C2410_UFSTAT);
+                return (ufstat & info->tx_fifofull) ? 0 : 1;
+        }
+
+        /* in non-fifo mode, we go and use the tx buffer empty */
+
+        utrstat = rd_regl(port, S3C2410_UTRSTAT);
+        return (utrstat & S3C2410_UTRSTAT_TXE) ? 1 : 0;
+}
+
+static void
+s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
+{
+        unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
+        while (!s3c24xx_serial_console_txrdy(port, ufcon))
+                barrier();
+        wr_regb(cons_uart, S3C2410_UTXH, ch);
+}
+
+static void
+s3c24xx_serial_console_write(struct console *co, const char *s,
+                             unsigned int count)
+{
+        uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
+}
+
+static void __init
+s3c24xx_serial_get_options(struct uart_port *port, int *baud,
+                           int *parity, int *bits)
+{
+        struct s3c24xx_uart_clksrc clksrc;
+        struct clk *clk;
+        unsigned int ulcon;
+        unsigned int ucon;
+        unsigned int ubrdiv;
+        unsigned long rate;
+
+        ulcon  = rd_regl(port, S3C2410_ULCON);
+        ucon   = rd_regl(port, S3C2410_UCON);
+        ubrdiv = rd_regl(port, S3C2410_UBRDIV);
+
+        dbg("s3c24xx_serial_get_options: port=%p\n"
+            "registers: ulcon=%08x, ucon=%08x, ubdriv=%08x\n",
+            port, ulcon, ucon, ubrdiv);
+
+        if ((ucon & 0xf) != 0) {
+                /* consider the serial port configured if the tx/rx mode set */
+
+                switch (ulcon & S3C2410_LCON_CSMASK) {
+                case S3C2410_LCON_CS5:
+                        *bits = 5;
+                        break;
+                case S3C2410_LCON_CS6:
+                        *bits = 6;
+                        break;
+                case S3C2410_LCON_CS7:
+                        *bits = 7;
+                        break;
+                default:
+                case S3C2410_LCON_CS8:
+                        *bits = 8;
+                        break;
+                }
+
+                switch (ulcon & S3C2410_LCON_PMASK) {
+                case S3C2410_LCON_PEVEN:
+                        *parity = 'e';
+                        break;
+
+                case S3C2410_LCON_PODD:
+                        *parity = 'o';
+                        break;
+
+                case S3C2410_LCON_PNONE:
+                default:
+                        *parity = 'n';
+                }
+
+                /* now calculate the baud rate */
+
+                s3c24xx_serial_getsource(port, &clksrc);
+
+                clk = clk_get(port->dev, clksrc.name);
+                if (!IS_ERR(clk) && clk != NULL)
+                        rate = clk_get_rate(clk) / clksrc.divisor;
+                else
+                        rate = 1;
+
+
+                *baud = rate / (16 * (ubrdiv + 1));
+                dbg("calculated baud %d\n", *baud);
+        }
+
+}
+
+/* s3c24xx_serial_init_ports
+ *
+ * initialise the serial ports from the machine provided initialisation
+ * data.
+*/
+
+static int s3c24xx_serial_init_ports(struct s3c24xx_uart_info **info)
+{
+        struct s3c24xx_uart_port *ptr = s3c24xx_serial_ports;
+        struct platform_device **platdev_ptr;
+        int i;
+
+        dbg("s3c24xx_serial_init_ports: initialising ports...\n");
+
+        platdev_ptr = s3c24xx_uart_devs;
+
+        for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++, ptr++, platdev_ptr++) {
+                s3c24xx_serial_init_port(ptr, info[i], *platdev_ptr);
+        }
+
+        return 0;
+}
+
+static int __init
+s3c24xx_serial_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        dbg("s3c24xx_serial_console_setup: co=%p (%d), %s\n",
+            co, co->index, options);
+
+        /* is this a valid port */
+
+        if (co->index == -1 || co->index >= CONFIG_SERIAL_SAMSUNG_UARTS)
+                co->index = 0;
+
+        port = &s3c24xx_serial_ports[co->index].port;
+
+        /* is the port configured? */
+
+        if (port->mapbase == 0x0) {
+                co->index = 0;
+                port = &s3c24xx_serial_ports[co->index].port;
+        }
+
+        cons_uart = port;
+
+        dbg("s3c24xx_serial_console_setup: port=%p (%d)\n", port, co->index);
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                s3c24xx_serial_get_options(port, &baud, &parity, &bits);
+
+        dbg("s3c24xx_serial_console_setup: baud %d\n", baud);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+/* s3c24xx_serial_initconsole
+ *
+ * initialise the console from one of the uart drivers
+*/
+
+static struct console s3c24xx_serial_console = {
+        .name           = S3C24XX_SERIAL_NAME,
+        .device         = uart_console_device,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .write          = s3c24xx_serial_console_write,
+        .setup          = s3c24xx_serial_console_setup
+};
+
+int s3c24xx_serial_initconsole(struct platform_driver *drv,
+                               struct s3c24xx_uart_info **info)
+
+{
+        struct platform_device *dev = s3c24xx_uart_devs[0];
+
+        dbg("s3c24xx_serial_initconsole\n");
+
+        /* select driver based on the cpu */
+
+        if (dev == NULL) {
+                printk(KERN_ERR "s3c24xx: no devices for console init\n");
+                return 0;
+        }
+
+        if (strcmp(dev->name, drv->driver.name) != 0)
+                return 0;
+
+        s3c24xx_serial_console.data = &s3c24xx_uart_drv;
+        s3c24xx_serial_init_ports(info);
+
+        register_console(&s3c24xx_serial_console);
+        return 0;
+}
+
+#endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
+
+MODULE_DESCRIPTION("Samsung SoC Serial port driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
new file mode 100644
index 000000000000..5b098cd76040
--- /dev/null
+++ b/drivers/tty/serial/samsung.h
@@ -0,0 +1,119 @@
+/*
+ * Driver for Samsung SoC onboard UARTs.
+ *
+ * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+struct s3c24xx_uart_info {
+        char                    *name;
+        unsigned int            type;
+        unsigned int            fifosize;
+        unsigned long           rx_fifomask;
+        unsigned long           rx_fifoshift;
+        unsigned long           rx_fifofull;
+        unsigned long           tx_fifomask;
+        unsigned long           tx_fifoshift;
+        unsigned long           tx_fifofull;
+
+        /* uart port features */
+
+        unsigned int            has_divslot:1;
+
+        /* clock source control */
+
+        int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
+        int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
+
+        /* uart controls */
+        int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *);
+};
+
+struct s3c24xx_uart_port {
+        unsigned char                   rx_claimed;
+        unsigned char                   tx_claimed;
+        unsigned int                    pm_level;
+        unsigned long                   baudclk_rate;
+
+        unsigned int                    rx_irq;
+        unsigned int                    tx_irq;
+
+        struct s3c24xx_uart_info        *info;
+        struct s3c24xx_uart_clksrc      *clksrc;
+        struct clk                      *clk;
+        struct clk                      *baudclk;
+        struct uart_port                port;
+
+#ifdef CONFIG_CPU_FREQ
+        struct notifier_block           freq_transition;
+#endif
+};
+
+/* conversion functions */
+
+#define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
+#define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data)
+
+/* register access controls */
+
+#define portaddr(port, reg) ((port)->membase + (reg))
+
+#define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
+#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
+
+#define wr_regb(port, reg, val) __raw_writeb(val, portaddr(port, reg))
+#define wr_regl(port, reg, val) __raw_writel(val, portaddr(port, reg))
+
+extern int s3c24xx_serial_probe(struct platform_device *dev,
+                                struct s3c24xx_uart_info *uart);
+
+extern int __devexit s3c24xx_serial_remove(struct platform_device *dev);
+
+extern int s3c24xx_serial_initconsole(struct platform_driver *drv,
+                                      struct s3c24xx_uart_info **uart);
+
+extern int s3c24xx_serial_init(struct platform_driver *drv,
+                               struct s3c24xx_uart_info *info);
+
+#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
+
+#define s3c24xx_console_init(__drv, __inf)                              \
+static int __init s3c_serial_console_init(void)                         \
+{                                                                       \
+        struct s3c24xx_uart_info *uinfo[CONFIG_SERIAL_SAMSUNG_UARTS];   \
+        int i;                                                          \
+                                                                        \
+        for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)               \
+                uinfo[i] = __inf;                                       \
+        return s3c24xx_serial_initconsole(__drv, uinfo);                \
+}                                                                       \
+                                                                        \
+console_initcall(s3c_serial_console_init)
+
+#else
+#define s3c24xx_console_init(drv, inf) extern void no_console(void)
+#endif
+
+#ifdef CONFIG_SERIAL_SAMSUNG_DEBUG
+
+extern void printascii(const char *);
+
+static void dbg(const char *fmt, ...)
+{
+        va_list va;
+        char buff[256];
+
+        va_start(va, fmt);
+        vsprintf(buff, fmt, va);
+        va_end(va);
+
+        printascii(buff);
+}
+
+#else
+#define dbg(x...) do { } while (0)
+#endif
diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c
new file mode 100644
index 000000000000..ea2340b814e9
--- /dev/null
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -0,0 +1,974 @@
+/*
+ *      Support for the asynchronous serial interface (DUART) included
+ *      in the BCM1250 and derived System-On-a-Chip (SOC) devices.
+ *
+ *      Copyright (c) 2007  Maciej W. Rozycki
+ *
+ *      Derived from drivers/char/sb1250_duart.c for which the following
+ *      copyright applies:
+ *
+ *      Copyright (c) 2000, 2001, 2002, 2003, 2004  Broadcom Corporation
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *      References:
+ *
+ *      "BCM1250/BCM1125/BCM1125H User Manual", Broadcom Corporation
+ */
+
+#if defined(CONFIG_SERIAL_SB1250_DUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/compiler.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/spinlock.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/types.h>
+
+#include <asm/atomic.h>
+#include <asm/io.h>
+#include <asm/war.h>
+
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_uart.h>
+#include <asm/sibyte/swarm.h>
+
+
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+#include <asm/sibyte/bcm1480_regs.h>
+#include <asm/sibyte/bcm1480_int.h>
+
+#define SBD_CHANREGS(line)      A_BCM1480_DUART_CHANREG((line), 0)
+#define SBD_CTRLREGS(line)      A_BCM1480_DUART_CTRLREG((line), 0)
+#define SBD_INT(line)           (K_BCM1480_INT_UART_0 + (line))
+
+#define DUART_CHANREG_SPACING   BCM1480_DUART_CHANREG_SPACING
+
+#define R_DUART_IMRREG(line)    R_BCM1480_DUART_IMRREG(line)
+#define R_DUART_INCHREG(line)   R_BCM1480_DUART_INCHREG(line)
+#define R_DUART_ISRREG(line)    R_BCM1480_DUART_ISRREG(line)
+
+#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_int.h>
+
+#define SBD_CHANREGS(line)      A_DUART_CHANREG((line), 0)
+#define SBD_CTRLREGS(line)      A_DUART_CTRLREG(0)
+#define SBD_INT(line)           (K_INT_UART_0 + (line))
+
+#else
+#error invalid SB1250 UART configuration
+
+#endif
+
+
+MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
+MODULE_DESCRIPTION("BCM1xxx on-chip DUART serial driver");
+MODULE_LICENSE("GPL");
+
+
+#define DUART_MAX_CHIP 2
+#define DUART_MAX_SIDE 2
+
+/*
+ * Per-port state.
+ */
+struct sbd_port {
+        struct sbd_duart        *duart;
+        struct uart_port        port;
+        unsigned char __iomem   *memctrl;
+        int                     tx_stopped;
+        int                     initialised;
+};
+
+/*
+ * Per-DUART state for the shared register space.
+ */
+struct sbd_duart {
+        struct sbd_port         sport[2];
+        unsigned long           mapctrl;
+        atomic_t                map_guard;
+};
+
+#define to_sport(uport) container_of(uport, struct sbd_port, port)
+
+static struct sbd_duart sbd_duarts[DUART_MAX_CHIP];
+
+
+/*
+ * Reading and writing SB1250 DUART registers.
+ *
+ * There are three register spaces: two per-channel ones and
+ * a shared one.  We have to define accessors appropriately.
+ * All registers are 64-bit and all but the Baud Rate Clock
+ * registers only define 8 least significant bits.  There is
+ * also a workaround to take into account.  Raw accessors use
+ * the full register width, but cooked ones truncate it
+ * intentionally so that the rest of the driver does not care.
+ */
+static u64 __read_sbdchn(struct sbd_port *sport, int reg)
+{
+        void __iomem *csr = sport->port.membase + reg;
+
+        return __raw_readq(csr);
+}
+
+static u64 __read_sbdshr(struct sbd_port *sport, int reg)
+{
+        void __iomem *csr = sport->memctrl + reg;
+
+        return __raw_readq(csr);
+}
+
+static void __write_sbdchn(struct sbd_port *sport, int reg, u64 value)
+{
+        void __iomem *csr = sport->port.membase + reg;
+
+        __raw_writeq(value, csr);
+}
+
+static void __write_sbdshr(struct sbd_port *sport, int reg, u64 value)
+{
+        void __iomem *csr = sport->memctrl + reg;
+
+        __raw_writeq(value, csr);
+}
+
+/*
+ * In bug 1956, we get glitches that can mess up uart registers.  This
+ * "read-mode-reg after any register access" is an accepted workaround.
+ */
+static void __war_sbd1956(struct sbd_port *sport)
+{
+        __read_sbdchn(sport, R_DUART_MODE_REG_1);
+        __read_sbdchn(sport, R_DUART_MODE_REG_2);
+}
+
+static unsigned char read_sbdchn(struct sbd_port *sport, int reg)
+{
+        unsigned char retval;
+
+        retval = __read_sbdchn(sport, reg);
+        if (SIBYTE_1956_WAR)
+                __war_sbd1956(sport);
+        return retval;
+}
+
+static unsigned char read_sbdshr(struct sbd_port *sport, int reg)
+{
+        unsigned char retval;
+
+        retval = __read_sbdshr(sport, reg);
+        if (SIBYTE_1956_WAR)
+                __war_sbd1956(sport);
+        return retval;
+}
+
+static void write_sbdchn(struct sbd_port *sport, int reg, unsigned int value)
+{
+        __write_sbdchn(sport, reg, value);
+        if (SIBYTE_1956_WAR)
+                __war_sbd1956(sport);
+}
+
+static void write_sbdshr(struct sbd_port *sport, int reg, unsigned int value)
+{
+        __write_sbdshr(sport, reg, value);
+        if (SIBYTE_1956_WAR)
+                __war_sbd1956(sport);
+}
+
+
+static int sbd_receive_ready(struct sbd_port *sport)
+{
+        return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_RX_RDY;
+}
+
+static int sbd_receive_drain(struct sbd_port *sport)
+{
+        int loops = 10000;
+
+        while (sbd_receive_ready(sport) && --loops)
+                read_sbdchn(sport, R_DUART_RX_HOLD);
+        return loops;
+}
+
+static int __maybe_unused sbd_transmit_ready(struct sbd_port *sport)
+{
+        return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_RDY;
+}
+
+static int __maybe_unused sbd_transmit_drain(struct sbd_port *sport)
+{
+        int loops = 10000;
+
+        while (!sbd_transmit_ready(sport) && --loops)
+                udelay(2);
+        return loops;
+}
+
+static int sbd_transmit_empty(struct sbd_port *sport)
+{
+        return read_sbdchn(sport, R_DUART_STATUS) & M_DUART_TX_EMT;
+}
+
+static int sbd_line_drain(struct sbd_port *sport)
+{
+        int loops = 10000;
+
+        while (!sbd_transmit_empty(sport) && --loops)
+                udelay(2);
+        return loops;
+}
+
+
+static unsigned int sbd_tx_empty(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        return sbd_transmit_empty(sport) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int sbd_get_mctrl(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+        unsigned int mctrl, status;
+
+        status = read_sbdshr(sport, R_DUART_IN_PORT);
+        status >>= (uport->line) % 2;
+        mctrl = (!(status & M_DUART_IN_PIN0_VAL) ? TIOCM_CTS : 0) |
+                (!(status & M_DUART_IN_PIN4_VAL) ? TIOCM_CAR : 0) |
+                (!(status & M_DUART_RIN0_PIN) ? TIOCM_RNG : 0) |
+                (!(status & M_DUART_IN_PIN2_VAL) ? TIOCM_DSR : 0);
+        return mctrl;
+}
+
+static void sbd_set_mctrl(struct uart_port *uport, unsigned int mctrl)
+{
+        struct sbd_port *sport = to_sport(uport);
+        unsigned int clr = 0, set = 0, mode2;
+
+        if (mctrl & TIOCM_DTR)
+                set |= M_DUART_SET_OPR2;
+        else
+                clr |= M_DUART_CLR_OPR2;
+        if (mctrl & TIOCM_RTS)
+                set |= M_DUART_SET_OPR0;
+        else
+                clr |= M_DUART_CLR_OPR0;
+        clr <<= (uport->line) % 2;
+        set <<= (uport->line) % 2;
+
+        mode2 = read_sbdchn(sport, R_DUART_MODE_REG_2);
+        mode2 &= ~M_DUART_CHAN_MODE;
+        if (mctrl & TIOCM_LOOP)
+                mode2 |= V_DUART_CHAN_MODE_LCL_LOOP;
+        else
+                mode2 |= V_DUART_CHAN_MODE_NORMAL;
+
+        write_sbdshr(sport, R_DUART_CLEAR_OPR, clr);
+        write_sbdshr(sport, R_DUART_SET_OPR, set);
+        write_sbdchn(sport, R_DUART_MODE_REG_2, mode2);
+}
+
+static void sbd_stop_tx(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS);
+        sport->tx_stopped = 1;
+};
+
+static void sbd_start_tx(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+        unsigned int mask;
+
+        /* Enable tx interrupts.  */
+        mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
+        mask |= M_DUART_IMR_TX;
+        write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
+
+        /* Go!, go!, go!...  */
+        write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_EN);
+        sport->tx_stopped = 0;
+};
+
+static void sbd_stop_rx(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), 0);
+};
+
+static void sbd_enable_ms(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        write_sbdchn(sport, R_DUART_AUXCTL_X,
+                     M_DUART_CIN_CHNG_ENA | M_DUART_CTS_CHNG_ENA);
+}
+
+static void sbd_break_ctl(struct uart_port *uport, int break_state)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        if (break_state == -1)
+                write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_START_BREAK);
+        else
+                write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_STOP_BREAK);
+}
+
+
+static void sbd_receive_chars(struct sbd_port *sport)
+{
+        struct uart_port *uport = &sport->port;
+        struct uart_icount *icount;
+        unsigned int status, ch, flag;
+        int count;
+
+        for (count = 16; count; count--) {
+                status = read_sbdchn(sport, R_DUART_STATUS);
+                if (!(status & M_DUART_RX_RDY))
+                        break;
+
+                ch = read_sbdchn(sport, R_DUART_RX_HOLD);
+
+                flag = TTY_NORMAL;
+
+                icount = &uport->icount;
+                icount->rx++;
+
+                if (unlikely(status &
+                             (M_DUART_RCVD_BRK | M_DUART_FRM_ERR |
+                              M_DUART_PARITY_ERR | M_DUART_OVRUN_ERR))) {
+                        if (status & M_DUART_RCVD_BRK) {
+                                icount->brk++;
+                                if (uart_handle_break(uport))
+                                        continue;
+                        } else if (status & M_DUART_FRM_ERR)
+                                icount->frame++;
+                        else if (status & M_DUART_PARITY_ERR)
+                                icount->parity++;
+                        if (status & M_DUART_OVRUN_ERR)
+                                icount->overrun++;
+
+                        status &= uport->read_status_mask;
+                        if (status & M_DUART_RCVD_BRK)
+                                flag = TTY_BREAK;
+                        else if (status & M_DUART_FRM_ERR)
+                                flag = TTY_FRAME;
+                        else if (status & M_DUART_PARITY_ERR)
+                                flag = TTY_PARITY;
+                }
+
+                if (uart_handle_sysrq_char(uport, ch))
+                        continue;
+
+                uart_insert_char(uport, status, M_DUART_OVRUN_ERR, ch, flag);
+        }
+
+        tty_flip_buffer_push(uport->state->port.tty);
+}
+
+static void sbd_transmit_chars(struct sbd_port *sport)
+{
+        struct uart_port *uport = &sport->port;
+        struct circ_buf *xmit = &sport->port.state->xmit;
+        unsigned int mask;
+        int stop_tx;
+
+        /* XON/XOFF chars.  */
+        if (sport->port.x_char) {
+                write_sbdchn(sport, R_DUART_TX_HOLD, sport->port.x_char);
+                sport->port.icount.tx++;
+                sport->port.x_char = 0;
+                return;
+        }
+
+        /* If nothing to do or stopped or hardware stopped.  */
+        stop_tx = (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port));
+
+        /* Send char.  */
+        if (!stop_tx) {
+                write_sbdchn(sport, R_DUART_TX_HOLD, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                sport->port.icount.tx++;
+
+                if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                        uart_write_wakeup(&sport->port);
+        }
+
+        /* Are we are done?  */
+        if (stop_tx || uart_circ_empty(xmit)) {
+                /* Disable tx interrupts.  */
+                mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
+                mask &= ~M_DUART_IMR_TX;
+                write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
+        }
+}
+
+static void sbd_status_handle(struct sbd_port *sport)
+{
+        struct uart_port *uport = &sport->port;
+        unsigned int delta;
+
+        delta = read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
+        delta >>= (uport->line) % 2;
+
+        if (delta & (M_DUART_IN_PIN0_VAL << S_DUART_IN_PIN_CHNG))
+                uart_handle_cts_change(uport, !(delta & M_DUART_IN_PIN0_VAL));
+
+        if (delta & (M_DUART_IN_PIN2_VAL << S_DUART_IN_PIN_CHNG))
+                uport->icount.dsr++;
+
+        if (delta & ((M_DUART_IN_PIN2_VAL | M_DUART_IN_PIN0_VAL) <<
+                     S_DUART_IN_PIN_CHNG))
+                wake_up_interruptible(&uport->state->port.delta_msr_wait);
+}
+
+static irqreturn_t sbd_interrupt(int irq, void *dev_id)
+{
+        struct sbd_port *sport = dev_id;
+        struct uart_port *uport = &sport->port;
+        irqreturn_t status = IRQ_NONE;
+        unsigned int intstat;
+        int count;
+
+        for (count = 16; count; count--) {
+                intstat = read_sbdshr(sport,
+                                      R_DUART_ISRREG((uport->line) % 2));
+                intstat &= read_sbdshr(sport,
+                                       R_DUART_IMRREG((uport->line) % 2));
+                intstat &= M_DUART_ISR_ALL;
+                if (!intstat)
+                        break;
+
+                if (intstat & M_DUART_ISR_RX)
+                        sbd_receive_chars(sport);
+                if (intstat & M_DUART_ISR_IN)
+                        sbd_status_handle(sport);
+                if (intstat & M_DUART_ISR_TX)
+                        sbd_transmit_chars(sport);
+
+                status = IRQ_HANDLED;
+        }
+
+        return status;
+}
+
+
+static int sbd_startup(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+        unsigned int mode1;
+        int ret;
+
+        ret = request_irq(sport->port.irq, sbd_interrupt,
+                          IRQF_SHARED, "sb1250-duart", sport);
+        if (ret)
+                return ret;
+
+        /* Clear the receive FIFO.  */
+        sbd_receive_drain(sport);
+
+        /* Clear the interrupt registers.  */
+        write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_BREAK_INT);
+        read_sbdshr(sport, R_DUART_INCHREG((uport->line) % 2));
+
+        /* Set rx/tx interrupt to FIFO available.  */
+        mode1 = read_sbdchn(sport, R_DUART_MODE_REG_1);
+        mode1 &= ~(M_DUART_RX_IRQ_SEL_RXFULL | M_DUART_TX_IRQ_SEL_TXEMPT);
+        write_sbdchn(sport, R_DUART_MODE_REG_1, mode1);
+
+        /* Disable tx, enable rx.  */
+        write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_EN);
+        sport->tx_stopped = 1;
+
+        /* Enable interrupts.  */
+        write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
+                     M_DUART_IMR_IN | M_DUART_IMR_RX);
+
+        return 0;
+}
+
+static void sbd_shutdown(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_DIS);
+        sport->tx_stopped = 1;
+        free_irq(sport->port.irq, sport);
+}
+
+
+static void sbd_init_port(struct sbd_port *sport)
+{
+        struct uart_port *uport = &sport->port;
+
+        if (sport->initialised)
+                return;
+
+        /* There is no DUART reset feature, so just set some sane defaults.  */
+        write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_TX);
+        write_sbdchn(sport, R_DUART_CMD, V_DUART_MISC_CMD_RESET_RX);
+        write_sbdchn(sport, R_DUART_MODE_REG_1, V_DUART_BITS_PER_CHAR_8);
+        write_sbdchn(sport, R_DUART_MODE_REG_2, 0);
+        write_sbdchn(sport, R_DUART_FULL_CTL,
+                     V_DUART_INT_TIME(0) | V_DUART_SIG_FULL(15));
+        write_sbdchn(sport, R_DUART_OPCR_X, 0);
+        write_sbdchn(sport, R_DUART_AUXCTL_X, 0);
+        write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), 0);
+
+        sport->initialised = 1;
+}
+
+static void sbd_set_termios(struct uart_port *uport, struct ktermios *termios,
+                            struct ktermios *old_termios)
+{
+        struct sbd_port *sport = to_sport(uport);
+        unsigned int mode1 = 0, mode2 = 0, aux = 0;
+        unsigned int mode1mask = 0, mode2mask = 0, auxmask = 0;
+        unsigned int oldmode1, oldmode2, oldaux;
+        unsigned int baud, brg;
+        unsigned int command;
+
+        mode1mask |= ~(M_DUART_PARITY_MODE | M_DUART_PARITY_TYPE_ODD |
+                       M_DUART_BITS_PER_CHAR);
+        mode2mask |= ~M_DUART_STOP_BIT_LEN_2;
+        auxmask |= ~M_DUART_CTS_CHNG_ENA;
+
+        /* Byte size.  */
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+        case CS6:
+                /* Unsupported, leave unchanged.  */
+                mode1mask |= M_DUART_PARITY_MODE;
+                break;
+        case CS7:
+                mode1 |= V_DUART_BITS_PER_CHAR_7;
+                break;
+        case CS8:
+        default:
+                mode1 |= V_DUART_BITS_PER_CHAR_8;
+                break;
+        }
+
+        /* Parity and stop bits.  */
+        if (termios->c_cflag & CSTOPB)
+                mode2 |= M_DUART_STOP_BIT_LEN_2;
+        else
+                mode2 |= M_DUART_STOP_BIT_LEN_1;
+        if (termios->c_cflag & PARENB)
+                mode1 |= V_DUART_PARITY_MODE_ADD;
+        else
+                mode1 |= V_DUART_PARITY_MODE_NONE;
+        if (termios->c_cflag & PARODD)
+                mode1 |= M_DUART_PARITY_TYPE_ODD;
+        else
+                mode1 |= M_DUART_PARITY_TYPE_EVEN;
+
+        baud = uart_get_baud_rate(uport, termios, old_termios, 1200, 5000000);
+        brg = V_DUART_BAUD_RATE(baud);
+        /* The actual lower bound is 1221bps, so compensate.  */
+        if (brg > M_DUART_CLK_COUNTER)
+                brg = M_DUART_CLK_COUNTER;
+
+        uart_update_timeout(uport, termios->c_cflag, baud);
+
+        uport->read_status_mask = M_DUART_OVRUN_ERR;
+        if (termios->c_iflag & INPCK)
+                uport->read_status_mask |= M_DUART_FRM_ERR |
+                                           M_DUART_PARITY_ERR;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                uport->read_status_mask |= M_DUART_RCVD_BRK;
+
+        uport->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                uport->ignore_status_mask |= M_DUART_FRM_ERR |
+                                             M_DUART_PARITY_ERR;
+        if (termios->c_iflag & IGNBRK) {
+                uport->ignore_status_mask |= M_DUART_RCVD_BRK;
+                if (termios->c_iflag & IGNPAR)
+                        uport->ignore_status_mask |= M_DUART_OVRUN_ERR;
+        }
+
+        if (termios->c_cflag & CREAD)
+                command = M_DUART_RX_EN;
+        else
+                command = M_DUART_RX_DIS;
+
+        if (termios->c_cflag & CRTSCTS)
+                aux |= M_DUART_CTS_CHNG_ENA;
+        else
+                aux &= ~M_DUART_CTS_CHNG_ENA;
+
+        spin_lock(&uport->lock);
+
+        if (sport->tx_stopped)
+                command |= M_DUART_TX_DIS;
+        else
+                command |= M_DUART_TX_EN;
+
+        oldmode1 = read_sbdchn(sport, R_DUART_MODE_REG_1) & mode1mask;
+        oldmode2 = read_sbdchn(sport, R_DUART_MODE_REG_2) & mode2mask;
+        oldaux = read_sbdchn(sport, R_DUART_AUXCTL_X) & auxmask;
+
+        if (!sport->tx_stopped)
+                sbd_line_drain(sport);
+        write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS | M_DUART_RX_DIS);
+
+        write_sbdchn(sport, R_DUART_MODE_REG_1, mode1 | oldmode1);
+        write_sbdchn(sport, R_DUART_MODE_REG_2, mode2 | oldmode2);
+        write_sbdchn(sport, R_DUART_CLK_SEL, brg);
+        write_sbdchn(sport, R_DUART_AUXCTL_X, aux | oldaux);
+
+        write_sbdchn(sport, R_DUART_CMD, command);
+
+        spin_unlock(&uport->lock);
+}
+
+
+static const char *sbd_type(struct uart_port *uport)
+{
+        return "SB1250 DUART";
+}
+
+static void sbd_release_port(struct uart_port *uport)
+{
+        struct sbd_port *sport = to_sport(uport);
+        struct sbd_duart *duart = sport->duart;
+        int map_guard;
+
+        iounmap(sport->memctrl);
+        sport->memctrl = NULL;
+        iounmap(uport->membase);
+        uport->membase = NULL;
+
+        map_guard = atomic_add_return(-1, &duart->map_guard);
+        if (!map_guard)
+                release_mem_region(duart->mapctrl, DUART_CHANREG_SPACING);
+        release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
+}
+
+static int sbd_map_port(struct uart_port *uport)
+{
+        const char *err = KERN_ERR "sbd: Cannot map MMIO\n";
+        struct sbd_port *sport = to_sport(uport);
+        struct sbd_duart *duart = sport->duart;
+
+        if (!uport->membase)
+                uport->membase = ioremap_nocache(uport->mapbase,
+                                                 DUART_CHANREG_SPACING);
+        if (!uport->membase) {
+                printk(err);
+                return -ENOMEM;
+        }
+
+        if (!sport->memctrl)
+                sport->memctrl = ioremap_nocache(duart->mapctrl,
+                                                 DUART_CHANREG_SPACING);
+        if (!sport->memctrl) {
+                printk(err);
+                iounmap(uport->membase);
+                uport->membase = NULL;
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+static int sbd_request_port(struct uart_port *uport)
+{
+        const char *err = KERN_ERR "sbd: Unable to reserve MMIO resource\n";
+        struct sbd_duart *duart = to_sport(uport)->duart;
+        int map_guard;
+        int ret = 0;
+
+        if (!request_mem_region(uport->mapbase, DUART_CHANREG_SPACING,
+                                "sb1250-duart")) {
+                printk(err);
+                return -EBUSY;
+        }
+        map_guard = atomic_add_return(1, &duart->map_guard);
+        if (map_guard == 1) {
+                if (!request_mem_region(duart->mapctrl, DUART_CHANREG_SPACING,
+                                        "sb1250-duart")) {
+                        atomic_add(-1, &duart->map_guard);
+                        printk(err);
+                        ret = -EBUSY;
+                }
+        }
+        if (!ret) {
+                ret = sbd_map_port(uport);
+                if (ret) {
+                        map_guard = atomic_add_return(-1, &duart->map_guard);
+                        if (!map_guard)
+                                release_mem_region(duart->mapctrl,
+                                                   DUART_CHANREG_SPACING);
+                }
+        }
+        if (ret) {
+                release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
+                return ret;
+        }
+        return 0;
+}
+
+static void sbd_config_port(struct uart_port *uport, int flags)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        if (flags & UART_CONFIG_TYPE) {
+                if (sbd_request_port(uport))
+                        return;
+
+                uport->type = PORT_SB1250_DUART;
+
+                sbd_init_port(sport);
+        }
+}
+
+static int sbd_verify_port(struct uart_port *uport, struct serial_struct *ser)
+{
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_SB1250_DUART)
+                ret = -EINVAL;
+        if (ser->irq != uport->irq)
+                ret = -EINVAL;
+        if (ser->baud_base != uport->uartclk / 16)
+                ret = -EINVAL;
+        return ret;
+}
+
+
+static const struct uart_ops sbd_ops = {
+        .tx_empty       = sbd_tx_empty,
+        .set_mctrl      = sbd_set_mctrl,
+        .get_mctrl      = sbd_get_mctrl,
+        .stop_tx        = sbd_stop_tx,
+        .start_tx       = sbd_start_tx,
+        .stop_rx        = sbd_stop_rx,
+        .enable_ms      = sbd_enable_ms,
+        .break_ctl      = sbd_break_ctl,
+        .startup        = sbd_startup,
+        .shutdown       = sbd_shutdown,
+        .set_termios    = sbd_set_termios,
+        .type           = sbd_type,
+        .release_port   = sbd_release_port,
+        .request_port   = sbd_request_port,
+        .config_port    = sbd_config_port,
+        .verify_port    = sbd_verify_port,
+};
+
+/* Initialize SB1250 DUART port structures.  */
+static void __init sbd_probe_duarts(void)
+{
+        static int probed;
+        int chip, side;
+        int max_lines, line;
+
+        if (probed)
+                return;
+
+        /* Set the number of available units based on the SOC type.  */
+        switch (soc_type) {
+        case K_SYS_SOC_TYPE_BCM1x55:
+        case K_SYS_SOC_TYPE_BCM1x80:
+                max_lines = 4;
+                break;
+        default:
+                /* Assume at least two serial ports at the normal address.  */
+                max_lines = 2;
+                break;
+        }
+
+        probed = 1;
+
+        for (chip = 0, line = 0; chip < DUART_MAX_CHIP && line < max_lines;
+             chip++) {
+                sbd_duarts[chip].mapctrl = SBD_CTRLREGS(line);
+
+                for (side = 0; side < DUART_MAX_SIDE && line < max_lines;
+                     side++, line++) {
+                        struct sbd_port *sport = &sbd_duarts[chip].sport[side];
+                        struct uart_port *uport = &sport->port;
+
+                        sport->duart    = &sbd_duarts[chip];
+
+                        uport->irq      = SBD_INT(line);
+                        uport->uartclk  = 100000000 / 20 * 16;
+                        uport->fifosize = 16;
+                        uport->iotype   = UPIO_MEM;
+                        uport->flags    = UPF_BOOT_AUTOCONF;
+                        uport->ops      = &sbd_ops;
+                        uport->line     = line;
+                        uport->mapbase  = SBD_CHANREGS(line);
+                }
+        }
+}
+
+
+#ifdef CONFIG_SERIAL_SB1250_DUART_CONSOLE
+/*
+ * Serial console stuff.  Very basic, polling driver for doing serial
+ * console output.  The console_lock is held by the caller, so we
+ * shouldn't be interrupted for more console activity.
+ */
+static void sbd_console_putchar(struct uart_port *uport, int ch)
+{
+        struct sbd_port *sport = to_sport(uport);
+
+        sbd_transmit_drain(sport);
+        write_sbdchn(sport, R_DUART_TX_HOLD, ch);
+}
+
+static void sbd_console_write(struct console *co, const char *s,
+                              unsigned int count)
+{
+        int chip = co->index / DUART_MAX_SIDE;
+        int side = co->index % DUART_MAX_SIDE;
+        struct sbd_port *sport = &sbd_duarts[chip].sport[side];
+        struct uart_port *uport = &sport->port;
+        unsigned long flags;
+        unsigned int mask;
+
+        /* Disable transmit interrupts and enable the transmitter. */
+        spin_lock_irqsave(&uport->lock, flags);
+        mask = read_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2));
+        write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2),
+                     mask & ~M_DUART_IMR_TX);
+        write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_EN);
+        spin_unlock_irqrestore(&uport->lock, flags);
+
+        uart_console_write(&sport->port, s, count, sbd_console_putchar);
+
+        /* Restore transmit interrupts and the transmitter enable. */
+        spin_lock_irqsave(&uport->lock, flags);
+        sbd_line_drain(sport);
+        if (sport->tx_stopped)
+                write_sbdchn(sport, R_DUART_CMD, M_DUART_TX_DIS);
+        write_sbdshr(sport, R_DUART_IMRREG((uport->line) % 2), mask);
+        spin_unlock_irqrestore(&uport->lock, flags);
+}
+
+static int __init sbd_console_setup(struct console *co, char *options)
+{
+        int chip = co->index / DUART_MAX_SIDE;
+        int side = co->index % DUART_MAX_SIDE;
+        struct sbd_port *sport = &sbd_duarts[chip].sport[side];
+        struct uart_port *uport = &sport->port;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+
+        if (!sport->duart)
+                return -ENXIO;
+
+        ret = sbd_map_port(uport);
+        if (ret)
+                return ret;
+
+        sbd_init_port(sport);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        return uart_set_options(uport, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver sbd_reg;
+static struct console sbd_console = {
+        .name   = "duart",
+        .write  = sbd_console_write,
+        .device = uart_console_device,
+        .setup  = sbd_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+        .data   = &sbd_reg
+};
+
+static int __init sbd_serial_console_init(void)
+{
+        sbd_probe_duarts();
+        register_console(&sbd_console);
+
+        return 0;
+}
+
+console_initcall(sbd_serial_console_init);
+
+#define SERIAL_SB1250_DUART_CONSOLE     &sbd_console
+#else
+#define SERIAL_SB1250_DUART_CONSOLE     NULL
+#endif /* CONFIG_SERIAL_SB1250_DUART_CONSOLE */
+
+
+static struct uart_driver sbd_reg = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "sb1250_duart",
+        .dev_name       = "duart",
+        .major          = TTY_MAJOR,
+        .minor          = SB1250_DUART_MINOR_BASE,
+        .nr             = DUART_MAX_CHIP * DUART_MAX_SIDE,
+        .cons           = SERIAL_SB1250_DUART_CONSOLE,
+};
+
+/* Set up the driver and register it.  */
+static int __init sbd_init(void)
+{
+        int i, ret;
+
+        sbd_probe_duarts();
+
+        ret = uart_register_driver(&sbd_reg);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < DUART_MAX_CHIP * DUART_MAX_SIDE; i++) {
+                struct sbd_duart *duart = &sbd_duarts[i / DUART_MAX_SIDE];
+                struct sbd_port *sport = &duart->sport[i % DUART_MAX_SIDE];
+                struct uart_port *uport = &sport->port;
+
+                if (sport->duart)
+                        uart_add_one_port(&sbd_reg, uport);
+        }
+
+        return 0;
+}
+
+/* Unload the driver.  Unregister stuff, get ready to go away.  */
+static void __exit sbd_exit(void)
+{
+        int i;
+
+        for (i = DUART_MAX_CHIP * DUART_MAX_SIDE - 1; i >= 0; i--) {
+                struct sbd_duart *duart = &sbd_duarts[i / DUART_MAX_SIDE];
+                struct sbd_port *sport = &duart->sport[i % DUART_MAX_SIDE];
+                struct uart_port *uport = &sport->port;
+
+                if (sport->duart)
+                        uart_remove_one_port(&sbd_reg, uport);
+        }
+
+        uart_unregister_driver(&sbd_reg);
+}
+
+module_init(sbd_init);
+module_exit(sbd_exit);
diff --git a/drivers/tty/serial/sc26xx.c b/drivers/tty/serial/sc26xx.c
new file mode 100644
index 000000000000..75038ad2b242
--- /dev/null
+++ b/drivers/tty/serial/sc26xx.c
@@ -0,0 +1,757 @@
+/*
+ * SC268xx.c: Serial driver for Philiphs SC2681/SC2692 devices.
+ *
+ * Copyright (C) 2006,2007 Thomas Bogendörfer (tsbogend@alpha.franken.de)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/irq.h>
+
+#if defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#define SC26XX_MAJOR         204
+#define SC26XX_MINOR_START   205
+#define SC26XX_NR            2
+
+struct uart_sc26xx_port {
+        struct uart_port      port[2];
+        u8     dsr_mask[2];
+        u8     cts_mask[2];
+        u8     dcd_mask[2];
+        u8     ri_mask[2];
+        u8     dtr_mask[2];
+        u8     rts_mask[2];
+        u8     imr;
+};
+
+/* register common to both ports */
+#define RD_ISR      0x14
+#define RD_IPR      0x34
+
+#define WR_ACR      0x10
+#define WR_IMR      0x14
+#define WR_OPCR     0x34
+#define WR_OPR_SET  0x38
+#define WR_OPR_CLR  0x3C
+
+/* access common register */
+#define READ_SC(p, r)        readb((p)->membase + RD_##r)
+#define WRITE_SC(p, r, v)    writeb((v), (p)->membase + WR_##r)
+
+/* register per port */
+#define RD_PORT_MRx 0x00
+#define RD_PORT_SR  0x04
+#define RD_PORT_RHR 0x0c
+
+#define WR_PORT_MRx 0x00
+#define WR_PORT_CSR 0x04
+#define WR_PORT_CR  0x08
+#define WR_PORT_THR 0x0c
+
+/* SR bits */
+#define SR_BREAK    (1 << 7)
+#define SR_FRAME    (1 << 6)
+#define SR_PARITY   (1 << 5)
+#define SR_OVERRUN  (1 << 4)
+#define SR_TXRDY    (1 << 2)
+#define SR_RXRDY    (1 << 0)
+
+#define CR_RES_MR   (1 << 4)
+#define CR_RES_RX   (2 << 4)
+#define CR_RES_TX   (3 << 4)
+#define CR_STRT_BRK (6 << 4)
+#define CR_STOP_BRK (7 << 4)
+#define CR_DIS_TX   (1 << 3)
+#define CR_ENA_TX   (1 << 2)
+#define CR_DIS_RX   (1 << 1)
+#define CR_ENA_RX   (1 << 0)
+
+/* ISR bits */
+#define ISR_RXRDYB  (1 << 5)
+#define ISR_TXRDYB  (1 << 4)
+#define ISR_RXRDYA  (1 << 1)
+#define ISR_TXRDYA  (1 << 0)
+
+/* IMR bits */
+#define IMR_RXRDY   (1 << 1)
+#define IMR_TXRDY   (1 << 0)
+
+/* access port register */
+static inline u8 read_sc_port(struct uart_port *p, u8 reg)
+{
+        return readb(p->membase + p->line * 0x20 + reg);
+}
+
+static inline void write_sc_port(struct uart_port *p, u8 reg, u8 val)
+{
+        writeb(val, p->membase + p->line * 0x20 + reg);
+}
+
+#define READ_SC_PORT(p, r)     read_sc_port(p, RD_PORT_##r)
+#define WRITE_SC_PORT(p, r, v) write_sc_port(p, WR_PORT_##r, v)
+
+static void sc26xx_enable_irq(struct uart_port *port, int mask)
+{
+        struct uart_sc26xx_port *up;
+        int line = port->line;
+
+        port -= line;
+        up = container_of(port, struct uart_sc26xx_port, port[0]);
+
+        up->imr |= mask << (line * 4);
+        WRITE_SC(port, IMR, up->imr);
+}
+
+static void sc26xx_disable_irq(struct uart_port *port, int mask)
+{
+        struct uart_sc26xx_port *up;
+        int line = port->line;
+
+        port -= line;
+        up = container_of(port, struct uart_sc26xx_port, port[0]);
+
+        up->imr &= ~(mask << (line * 4));
+        WRITE_SC(port, IMR, up->imr);
+}
+
+static struct tty_struct *receive_chars(struct uart_port *port)
+{
+        struct tty_struct *tty = NULL;
+        int limit = 10000;
+        unsigned char ch;
+        char flag;
+        u8 status;
+
+        if (port->state != NULL)                /* Unopened serial console */
+                tty = port->state->port.tty;
+
+        while (limit-- > 0) {
+                status = READ_SC_PORT(port, SR);
+                if (!(status & SR_RXRDY))
+                        break;
+                ch = READ_SC_PORT(port, RHR);
+
+                flag = TTY_NORMAL;
+                port->icount.rx++;
+
+                if (unlikely(status & (SR_BREAK | SR_FRAME |
+                                       SR_PARITY | SR_OVERRUN))) {
+                        if (status & SR_BREAK) {
+                                status &= ~(SR_PARITY | SR_FRAME);
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        continue;
+                        } else if (status & SR_PARITY)
+                                port->icount.parity++;
+                        else if (status & SR_FRAME)
+                                port->icount.frame++;
+                        if (status & SR_OVERRUN)
+                                port->icount.overrun++;
+
+                        status &= port->read_status_mask;
+                        if (status & SR_BREAK)
+                                flag = TTY_BREAK;
+                        else if (status & SR_PARITY)
+                                flag = TTY_PARITY;
+                        else if (status & SR_FRAME)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        continue;
+
+                if (status & port->ignore_status_mask)
+                        continue;
+
+                tty_insert_flip_char(tty, ch, flag);
+        }
+        return tty;
+}
+
+static void transmit_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit;
+
+        if (!port->state)
+                return;
+
+        xmit = &port->state->xmit;
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                sc26xx_disable_irq(port, IMR_TXRDY);
+                return;
+        }
+        while (!uart_circ_empty(xmit)) {
+                if (!(READ_SC_PORT(port, SR) & SR_TXRDY))
+                        break;
+
+                WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+}
+
+static irqreturn_t sc26xx_interrupt(int irq, void *dev_id)
+{
+        struct uart_sc26xx_port *up = dev_id;
+        struct tty_struct *tty;
+        unsigned long flags;
+        u8 isr;
+
+        spin_lock_irqsave(&up->port[0].lock, flags);
+
+        tty = NULL;
+        isr = READ_SC(&up->port[0], ISR);
+        if (isr & ISR_TXRDYA)
+            transmit_chars(&up->port[0]);
+        if (isr & ISR_RXRDYA)
+            tty = receive_chars(&up->port[0]);
+
+        spin_unlock(&up->port[0].lock);
+
+        if (tty)
+                tty_flip_buffer_push(tty);
+
+        spin_lock(&up->port[1].lock);
+
+        tty = NULL;
+        if (isr & ISR_TXRDYB)
+            transmit_chars(&up->port[1]);
+        if (isr & ISR_RXRDYB)
+            tty = receive_chars(&up->port[1]);
+
+        spin_unlock_irqrestore(&up->port[1].lock, flags);
+
+        if (tty)
+                tty_flip_buffer_push(tty);
+
+        return IRQ_HANDLED;
+}
+
+/* port->lock is not held.  */
+static unsigned int sc26xx_tx_empty(struct uart_port *port)
+{
+        return (READ_SC_PORT(port, SR) & SR_TXRDY) ? TIOCSER_TEMT : 0;
+}
+
+/* port->lock held by caller.  */
+static void sc26xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_sc26xx_port *up;
+        int line = port->line;
+
+        port -= line;
+        up = container_of(port, struct uart_sc26xx_port, port[0]);
+
+        if (up->dtr_mask[line]) {
+                if (mctrl & TIOCM_DTR)
+                        WRITE_SC(port, OPR_SET, up->dtr_mask[line]);
+                else
+                        WRITE_SC(port, OPR_CLR, up->dtr_mask[line]);
+        }
+        if (up->rts_mask[line]) {
+                if (mctrl & TIOCM_RTS)
+                        WRITE_SC(port, OPR_SET, up->rts_mask[line]);
+                else
+                        WRITE_SC(port, OPR_CLR, up->rts_mask[line]);
+        }
+}
+
+/* port->lock is held by caller and interrupts are disabled.  */
+static unsigned int sc26xx_get_mctrl(struct uart_port *port)
+{
+        struct uart_sc26xx_port *up;
+        int line = port->line;
+        unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
+        u8 ipr;
+
+        port -= line;
+        up = container_of(port, struct uart_sc26xx_port, port[0]);
+        ipr = READ_SC(port, IPR) ^ 0xff;
+
+        if (up->dsr_mask[line]) {
+                mctrl &= ~TIOCM_DSR;
+                mctrl |= ipr & up->dsr_mask[line] ? TIOCM_DSR : 0;
+        }
+        if (up->cts_mask[line]) {
+                mctrl &= ~TIOCM_CTS;
+                mctrl |= ipr & up->cts_mask[line] ? TIOCM_CTS : 0;
+        }
+        if (up->dcd_mask[line]) {
+                mctrl &= ~TIOCM_CAR;
+                mctrl |= ipr & up->dcd_mask[line] ? TIOCM_CAR : 0;
+        }
+        if (up->ri_mask[line]) {
+                mctrl &= ~TIOCM_RNG;
+                mctrl |= ipr & up->ri_mask[line] ? TIOCM_RNG : 0;
+        }
+        return mctrl;
+}
+
+/* port->lock held by caller.  */
+static void sc26xx_stop_tx(struct uart_port *port)
+{
+        return;
+}
+
+/* port->lock held by caller.  */
+static void sc26xx_start_tx(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+
+        while (!uart_circ_empty(xmit)) {
+                if (!(READ_SC_PORT(port, SR) & SR_TXRDY)) {
+                        sc26xx_enable_irq(port, IMR_TXRDY);
+                        break;
+                }
+                WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+}
+
+/* port->lock held by caller.  */
+static void sc26xx_stop_rx(struct uart_port *port)
+{
+}
+
+/* port->lock held by caller.  */
+static void sc26xx_enable_ms(struct uart_port *port)
+{
+}
+
+/* port->lock is not held.  */
+static void sc26xx_break_ctl(struct uart_port *port, int break_state)
+{
+        if (break_state == -1)
+                WRITE_SC_PORT(port, CR, CR_STRT_BRK);
+        else
+                WRITE_SC_PORT(port, CR, CR_STOP_BRK);
+}
+
+/* port->lock is not held.  */
+static int sc26xx_startup(struct uart_port *port)
+{
+        sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
+        WRITE_SC(port, OPCR, 0);
+
+        /* reset tx and rx */
+        WRITE_SC_PORT(port, CR, CR_RES_RX);
+        WRITE_SC_PORT(port, CR, CR_RES_TX);
+
+        /* start rx/tx */
+        WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
+
+        /* enable irqs */
+        sc26xx_enable_irq(port, IMR_RXRDY);
+        return 0;
+}
+
+/* port->lock is not held.  */
+static void sc26xx_shutdown(struct uart_port *port)
+{
+        /* disable interrupst */
+        sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
+
+        /* stop tx/rx */
+        WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
+}
+
+/* port->lock is not held.  */
+static void sc26xx_set_termios(struct uart_port *port, struct ktermios *termios,
+                              struct ktermios *old)
+{
+        unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
+        unsigned int quot = uart_get_divisor(port, baud);
+        unsigned int iflag, cflag;
+        unsigned long flags;
+        u8 mr1, mr2, csr;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc)
+                udelay(2);
+
+        WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
+
+        iflag = termios->c_iflag;
+        cflag = termios->c_cflag;
+
+        port->read_status_mask = SR_OVERRUN;
+        if (iflag & INPCK)
+                port->read_status_mask |= SR_PARITY | SR_FRAME;
+        if (iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= SR_BREAK;
+
+        port->ignore_status_mask = 0;
+        if (iflag & IGNBRK)
+                port->ignore_status_mask |= SR_BREAK;
+        if ((cflag & CREAD) == 0)
+                port->ignore_status_mask |= SR_BREAK | SR_FRAME |
+                                            SR_PARITY | SR_OVERRUN;
+
+        switch (cflag & CSIZE) {
+        case CS5:
+                mr1 = 0x00;
+                break;
+        case CS6:
+                mr1 = 0x01;
+                break;
+        case CS7:
+                mr1 = 0x02;
+                break;
+        default:
+        case CS8:
+                mr1 = 0x03;
+                break;
+        }
+        mr2 = 0x07;
+        if (cflag & CSTOPB)
+                mr2 = 0x0f;
+        if (cflag & PARENB) {
+                if (cflag & PARODD)
+                        mr1 |= (1 << 2);
+        } else
+                mr1 |= (2 << 3);
+
+        switch (baud) {
+        case 50:
+                csr = 0x00;
+                break;
+        case 110:
+                csr = 0x11;
+                break;
+        case 134:
+                csr = 0x22;
+                break;
+        case 200:
+                csr = 0x33;
+                break;
+        case 300:
+                csr = 0x44;
+                break;
+        case 600:
+                csr = 0x55;
+                break;
+        case 1200:
+                csr = 0x66;
+                break;
+        case 2400:
+                csr = 0x88;
+                break;
+        case 4800:
+                csr = 0x99;
+                break;
+        default:
+        case 9600:
+                csr = 0xbb;
+                break;
+        case 19200:
+                csr = 0xcc;
+                break;
+        }
+
+        WRITE_SC_PORT(port, CR, CR_RES_MR);
+        WRITE_SC_PORT(port, MRx, mr1);
+        WRITE_SC_PORT(port, MRx, mr2);
+
+        WRITE_SC(port, ACR, 0x80);
+        WRITE_SC_PORT(port, CSR, csr);
+
+        /* reset tx and rx */
+        WRITE_SC_PORT(port, CR, CR_RES_RX);
+        WRITE_SC_PORT(port, CR, CR_RES_TX);
+
+        WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
+        while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc)
+                udelay(2);
+
+        /* XXX */
+        uart_update_timeout(port, cflag,
+                            (port->uartclk / (16 * quot)));
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *sc26xx_type(struct uart_port *port)
+{
+        return "SC26XX";
+}
+
+static void sc26xx_release_port(struct uart_port *port)
+{
+}
+
+static int sc26xx_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void sc26xx_config_port(struct uart_port *port, int flags)
+{
+}
+
+static int sc26xx_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+static struct uart_ops sc26xx_ops = {
+        .tx_empty       = sc26xx_tx_empty,
+        .set_mctrl      = sc26xx_set_mctrl,
+        .get_mctrl      = sc26xx_get_mctrl,
+        .stop_tx        = sc26xx_stop_tx,
+        .start_tx       = sc26xx_start_tx,
+        .stop_rx        = sc26xx_stop_rx,
+        .enable_ms      = sc26xx_enable_ms,
+        .break_ctl      = sc26xx_break_ctl,
+        .startup        = sc26xx_startup,
+        .shutdown       = sc26xx_shutdown,
+        .set_termios    = sc26xx_set_termios,
+        .type           = sc26xx_type,
+        .release_port   = sc26xx_release_port,
+        .request_port   = sc26xx_request_port,
+        .config_port    = sc26xx_config_port,
+        .verify_port    = sc26xx_verify_port,
+};
+
+static struct uart_port *sc26xx_port;
+
+#ifdef CONFIG_SERIAL_SC26XX_CONSOLE
+static void sc26xx_console_putchar(struct uart_port *port, char c)
+{
+        unsigned long flags;
+        int limit = 1000000;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        while (limit-- > 0) {
+                if (READ_SC_PORT(port, SR) & SR_TXRDY) {
+                        WRITE_SC_PORT(port, THR, c);
+                        break;
+                }
+                udelay(2);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void sc26xx_console_write(struct console *con, const char *s, unsigned n)
+{
+        struct uart_port *port = sc26xx_port;
+        int i;
+
+        for (i = 0; i < n; i++) {
+                if (*s == '\n')
+                        sc26xx_console_putchar(port, '\r');
+                sc26xx_console_putchar(port, *s++);
+        }
+}
+
+static int __init sc26xx_console_setup(struct console *con, char *options)
+{
+        struct uart_port *port = sc26xx_port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (port->type != PORT_SC26XX)
+                return -1;
+
+        printk(KERN_INFO "Console: ttySC%d (SC26XX)\n", con->index);
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, con, baud, parity, bits, flow);
+}
+
+static struct uart_driver sc26xx_reg;
+static struct console sc26xx_console = {
+        .name   =       "ttySC",
+        .write  =       sc26xx_console_write,
+        .device =       uart_console_device,
+        .setup  =       sc26xx_console_setup,
+        .flags  =       CON_PRINTBUFFER,
+        .index  =       -1,
+        .data   =       &sc26xx_reg,
+};
+#define SC26XX_CONSOLE   &sc26xx_console
+#else
+#define SC26XX_CONSOLE   NULL
+#endif
+
+static struct uart_driver sc26xx_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "SC26xx",
+        .dev_name               = "ttySC",
+        .major                  = SC26XX_MAJOR,
+        .minor                  = SC26XX_MINOR_START,
+        .nr                     = SC26XX_NR,
+        .cons                   = SC26XX_CONSOLE,
+};
+
+static u8 sc26xx_flags2mask(unsigned int flags, unsigned int bitpos)
+{
+        unsigned int bit = (flags >> bitpos) & 15;
+
+        return bit ? (1 << (bit - 1)) : 0;
+}
+
+static void __devinit sc26xx_init_masks(struct uart_sc26xx_port *up,
+                                        int line, unsigned int data)
+{
+        up->dtr_mask[line] = sc26xx_flags2mask(data,  0);
+        up->rts_mask[line] = sc26xx_flags2mask(data,  4);
+        up->dsr_mask[line] = sc26xx_flags2mask(data,  8);
+        up->cts_mask[line] = sc26xx_flags2mask(data, 12);
+        up->dcd_mask[line] = sc26xx_flags2mask(data, 16);
+        up->ri_mask[line]  = sc26xx_flags2mask(data, 20);
+}
+
+static int __devinit sc26xx_probe(struct platform_device *dev)
+{
+        struct resource *res;
+        struct uart_sc26xx_port *up;
+        unsigned int *sc26xx_data = dev->dev.platform_data;
+        int err;
+
+        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENODEV;
+
+        up = kzalloc(sizeof *up, GFP_KERNEL);
+        if (unlikely(!up))
+                return -ENOMEM;
+
+        up->port[0].line = 0;
+        up->port[0].ops = &sc26xx_ops;
+        up->port[0].type = PORT_SC26XX;
+        up->port[0].uartclk = (29491200 / 16); /* arbitrary */
+
+        up->port[0].mapbase = res->start;
+        up->port[0].membase = ioremap_nocache(up->port[0].mapbase, 0x40);
+        up->port[0].iotype = UPIO_MEM;
+        up->port[0].irq = platform_get_irq(dev, 0);
+
+        up->port[0].dev = &dev->dev;
+
+        sc26xx_init_masks(up, 0, sc26xx_data[0]);
+
+        sc26xx_port = &up->port[0];
+
+        up->port[1].line = 1;
+        up->port[1].ops = &sc26xx_ops;
+        up->port[1].type = PORT_SC26XX;
+        up->port[1].uartclk = (29491200 / 16); /* arbitrary */
+
+        up->port[1].mapbase = up->port[0].mapbase;
+        up->port[1].membase = up->port[0].membase;
+        up->port[1].iotype = UPIO_MEM;
+        up->port[1].irq = up->port[0].irq;
+
+        up->port[1].dev = &dev->dev;
+
+        sc26xx_init_masks(up, 1, sc26xx_data[1]);
+
+        err = uart_register_driver(&sc26xx_reg);
+        if (err)
+                goto out_free_port;
+
+        sc26xx_reg.tty_driver->name_base = sc26xx_reg.minor;
+
+        err = uart_add_one_port(&sc26xx_reg, &up->port[0]);
+        if (err)
+                goto out_unregister_driver;
+
+        err = uart_add_one_port(&sc26xx_reg, &up->port[1]);
+        if (err)
+                goto out_remove_port0;
+
+        err = request_irq(up->port[0].irq, sc26xx_interrupt, 0, "sc26xx", up);
+        if (err)
+                goto out_remove_ports;
+
+        dev_set_drvdata(&dev->dev, up);
+        return 0;
+
+out_remove_ports:
+        uart_remove_one_port(&sc26xx_reg, &up->port[1]);
+out_remove_port0:
+        uart_remove_one_port(&sc26xx_reg, &up->port[0]);
+
+out_unregister_driver:
+        uart_unregister_driver(&sc26xx_reg);
+
+out_free_port:
+        kfree(up);
+        sc26xx_port = NULL;
+        return err;
+}
+
+
+static int __exit sc26xx_driver_remove(struct platform_device *dev)
+{
+        struct uart_sc26xx_port *up = dev_get_drvdata(&dev->dev);
+
+        free_irq(up->port[0].irq, up);
+
+        uart_remove_one_port(&sc26xx_reg, &up->port[0]);
+        uart_remove_one_port(&sc26xx_reg, &up->port[1]);
+
+        uart_unregister_driver(&sc26xx_reg);
+
+        kfree(up);
+        sc26xx_port = NULL;
+
+        dev_set_drvdata(&dev->dev, NULL);
+        return 0;
+}
+
+static struct platform_driver sc26xx_driver = {
+        .probe  = sc26xx_probe,
+        .remove = __devexit_p(sc26xx_driver_remove),
+        .driver = {
+                .name   = "SC26xx",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init sc26xx_init(void)
+{
+        return platform_driver_register(&sc26xx_driver);
+}
+
+static void __exit sc26xx_exit(void)
+{
+        platform_driver_unregister(&sc26xx_driver);
+}
+
+module_init(sc26xx_init);
+module_exit(sc26xx_exit);
+
+
+MODULE_AUTHOR("Thomas Bogendörfer");
+MODULE_DESCRIPTION("SC681/SC2692 serial driver");
+MODULE_VERSION("1.0");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:SC26xx");
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
new file mode 100644
index 000000000000..db7912cb7ae0
--- /dev/null
+++ b/drivers/tty/serial/serial_core.c
@@ -0,0 +1,2504 @@
+/*
+ *  Driver core for serial ports
+ *
+ *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
+ *
+ *  Copyright 1999 ARM Limited
+ *  Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/device.h>
+#include <linux/serial.h> /* for serial_state and serial_icounter_struct */
+#include <linux/serial_core.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+/*
+ * This is used to lock changes in serial line configuration.
+ */
+static DEFINE_MUTEX(port_mutex);
+
+/*
+ * lockdep: port->lock is initialized in two places, but we
+ *          want only one lock-class:
+ */
+static struct lock_class_key port_lock_key;
+
+#define HIGH_BITS_OFFSET        ((sizeof(long)-sizeof(int))*8)
+
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+#define uart_console(port)      ((port)->cons && (port)->cons->index == (port)->line)
+#else
+#define uart_console(port)      (0)
+#endif
+
+static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
+                                        struct ktermios *old_termios);
+static void __uart_wait_until_sent(struct uart_port *port, int timeout);
+static void uart_change_pm(struct uart_state *state, int pm_state);
+
+/*
+ * This routine is used by the interrupt handler to schedule processing in
+ * the software interrupt portion of the driver.
+ */
+void uart_write_wakeup(struct uart_port *port)
+{
+        struct uart_state *state = port->state;
+        /*
+         * This means you called this function _after_ the port was
+         * closed.  No cookie for you.
+         */
+        BUG_ON(!state);
+        tasklet_schedule(&state->tlet);
+}
+
+static void uart_stop(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port = state->uart_port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        port->ops->stop_tx(port);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void __uart_start(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port = state->uart_port;
+
+        if (!uart_circ_empty(&state->xmit) && state->xmit.buf &&
+            !tty->stopped && !tty->hw_stopped)
+                port->ops->start_tx(port);
+}
+
+static void uart_start(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port = state->uart_port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        __uart_start(tty);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void uart_tasklet_action(unsigned long data)
+{
+        struct uart_state *state = (struct uart_state *)data;
+        tty_wakeup(state->port.tty);
+}
+
+static inline void
+uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
+{
+        unsigned long flags;
+        unsigned int old;
+
+        spin_lock_irqsave(&port->lock, flags);
+        old = port->mctrl;
+        port->mctrl = (old & ~clear) | set;
+        if (old != port->mctrl)
+                port->ops->set_mctrl(port, port->mctrl);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+#define uart_set_mctrl(port, set)       uart_update_mctrl(port, set, 0)
+#define uart_clear_mctrl(port, clear)   uart_update_mctrl(port, 0, clear)
+
+/*
+ * Startup the port.  This will be called once per open.  All calls
+ * will be serialised by the per-port mutex.
+ */
+static int uart_startup(struct tty_struct *tty, struct uart_state *state, int init_hw)
+{
+        struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
+        unsigned long page;
+        int retval = 0;
+
+        if (port->flags & ASYNC_INITIALIZED)
+                return 0;
+
+        /*
+         * Set the TTY IO error marker - we will only clear this
+         * once we have successfully opened the port.  Also set
+         * up the tty->alt_speed kludge
+         */
+        set_bit(TTY_IO_ERROR, &tty->flags);
+
+        if (uport->type == PORT_UNKNOWN)
+                return 0;
+
+        /*
+         * Initialise and allocate the transmit and temporary
+         * buffer.
+         */
+        if (!state->xmit.buf) {
+                /* This is protected by the per port mutex */
+                page = get_zeroed_page(GFP_KERNEL);
+                if (!page)
+                        return -ENOMEM;
+
+                state->xmit.buf = (unsigned char *) page;
+                uart_circ_clear(&state->xmit);
+        }
+
+        retval = uport->ops->startup(uport);
+        if (retval == 0) {
+                if (uart_console(uport) && uport->cons->cflag) {
+                        tty->termios->c_cflag = uport->cons->cflag;
+                        uport->cons->cflag = 0;
+                }
+                /*
+                 * Initialise the hardware port settings.
+                 */
+                uart_change_speed(tty, state, NULL);
+
+                if (init_hw) {
+                        /*
+                         * Setup the RTS and DTR signals once the
+                         * port is open and ready to respond.
+                         */
+                        if (tty->termios->c_cflag & CBAUD)
+                                uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
+                }
+
+                if (port->flags & ASYNC_CTS_FLOW) {
+                        spin_lock_irq(&uport->lock);
+                        if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS))
+                                tty->hw_stopped = 1;
+                        spin_unlock_irq(&uport->lock);
+                }
+
+                set_bit(ASYNCB_INITIALIZED, &port->flags);
+
+                clear_bit(TTY_IO_ERROR, &tty->flags);
+        }
+
+        if (retval && capable(CAP_SYS_ADMIN))
+                retval = 0;
+
+        return retval;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.  Calls to
+ * uart_shutdown are serialised by the per-port semaphore.
+ */
+static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
+{
+        struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
+
+        /*
+         * Set the TTY IO error marker
+         */
+        if (tty)
+                set_bit(TTY_IO_ERROR, &tty->flags);
+
+        if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) {
+                /*
+                 * Turn off DTR and RTS early.
+                 */
+                if (!tty || (tty->termios->c_cflag & HUPCL))
+                        uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
+
+                /*
+                 * clear delta_msr_wait queue to avoid mem leaks: we may free
+                 * the irq here so the queue might never be woken up.  Note
+                 * that we won't end up waiting on delta_msr_wait again since
+                 * any outstanding file descriptors should be pointing at
+                 * hung_up_tty_fops now.
+                 */
+                wake_up_interruptible(&port->delta_msr_wait);
+
+                /*
+                 * Free the IRQ and disable the port.
+                 */
+                uport->ops->shutdown(uport);
+
+                /*
+                 * Ensure that the IRQ handler isn't running on another CPU.
+                 */
+                synchronize_irq(uport->irq);
+        }
+
+        /*
+         * kill off our tasklet
+         */
+        tasklet_kill(&state->tlet);
+
+        /*
+         * Free the transmit buffer page.
+         */
+        if (state->xmit.buf) {
+                free_page((unsigned long)state->xmit.buf);
+                state->xmit.buf = NULL;
+        }
+}
+
+/**
+ *      uart_update_timeout - update per-port FIFO timeout.
+ *      @port:  uart_port structure describing the port
+ *      @cflag: termios cflag value
+ *      @baud:  speed of the port
+ *
+ *      Set the port FIFO timeout value.  The @cflag value should
+ *      reflect the actual hardware settings.
+ */
+void
+uart_update_timeout(struct uart_port *port, unsigned int cflag,
+                    unsigned int baud)
+{
+        unsigned int bits;
+
+        /* byte size and parity */
+        switch (cflag & CSIZE) {
+        case CS5:
+                bits = 7;
+                break;
+        case CS6:
+                bits = 8;
+                break;
+        case CS7:
+                bits = 9;
+                break;
+        default:
+                bits = 10;
+                break; /* CS8 */
+        }
+
+        if (cflag & CSTOPB)
+                bits++;
+        if (cflag & PARENB)
+                bits++;
+
+        /*
+         * The total number of bits to be transmitted in the fifo.
+         */
+        bits = bits * port->fifosize;
+
+        /*
+         * Figure the timeout to send the above number of bits.
+         * Add .02 seconds of slop
+         */
+        port->timeout = (HZ * bits) / baud + HZ/50;
+}
+
+EXPORT_SYMBOL(uart_update_timeout);
+
+/**
+ *      uart_get_baud_rate - return baud rate for a particular port
+ *      @port: uart_port structure describing the port in question.
+ *      @termios: desired termios settings.
+ *      @old: old termios (or NULL)
+ *      @min: minimum acceptable baud rate
+ *      @max: maximum acceptable baud rate
+ *
+ *      Decode the termios structure into a numeric baud rate,
+ *      taking account of the magic 38400 baud rate (with spd_*
+ *      flags), and mapping the %B0 rate to 9600 baud.
+ *
+ *      If the new baud rate is invalid, try the old termios setting.
+ *      If it's still invalid, we try 9600 baud.
+ *
+ *      Update the @termios structure to reflect the baud rate
+ *      we're actually going to be using. Don't do this for the case
+ *      where B0 is requested ("hang up").
+ */
+unsigned int
+uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
+                   struct ktermios *old, unsigned int min, unsigned int max)
+{
+        unsigned int try, baud, altbaud = 38400;
+        int hung_up = 0;
+        upf_t flags = port->flags & UPF_SPD_MASK;
+
+        if (flags == UPF_SPD_HI)
+                altbaud = 57600;
+        else if (flags == UPF_SPD_VHI)
+                altbaud = 115200;
+        else if (flags == UPF_SPD_SHI)
+                altbaud = 230400;
+        else if (flags == UPF_SPD_WARP)
+                altbaud = 460800;
+
+        for (try = 0; try < 2; try++) {
+                baud = tty_termios_baud_rate(termios);
+
+                /*
+                 * The spd_hi, spd_vhi, spd_shi, spd_warp kludge...
+                 * Die! Die! Die!
+                 */
+                if (baud == 38400)
+                        baud = altbaud;
+
+                /*
+                 * Special case: B0 rate.
+                 */
+                if (baud == 0) {
+                        hung_up = 1;
+                        baud = 9600;
+                }
+
+                if (baud >= min && baud <= max)
+                        return baud;
+
+                /*
+                 * Oops, the quotient was zero.  Try again with
+                 * the old baud rate if possible.
+                 */
+                termios->c_cflag &= ~CBAUD;
+                if (old) {
+                        baud = tty_termios_baud_rate(old);
+                        if (!hung_up)
+                                tty_termios_encode_baud_rate(termios,
+                                                                baud, baud);
+                        old = NULL;
+                        continue;
+                }
+
+                /*
+                 * As a last resort, if the range cannot be met then clip to
+                 * the nearest chip supported rate.
+                 */
+                if (!hung_up) {
+                        if (baud <= min)
+                                tty_termios_encode_baud_rate(termios,
+                                                        min + 1, min + 1);
+                        else
+                                tty_termios_encode_baud_rate(termios,
+                                                        max - 1, max - 1);
+                }
+        }
+        /* Should never happen */
+        WARN_ON(1);
+        return 0;
+}
+
+EXPORT_SYMBOL(uart_get_baud_rate);
+
+/**
+ *      uart_get_divisor - return uart clock divisor
+ *      @port: uart_port structure describing the port.
+ *      @baud: desired baud rate
+ *
+ *      Calculate the uart clock divisor for the port.
+ */
+unsigned int
+uart_get_divisor(struct uart_port *port, unsigned int baud)
+{
+        unsigned int quot;
+
+        /*
+         * Old custom speed handling.
+         */
+        if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
+                quot = port->custom_divisor;
+        else
+                quot = (port->uartclk + (8 * baud)) / (16 * baud);
+
+        return quot;
+}
+
+EXPORT_SYMBOL(uart_get_divisor);
+
+/* FIXME: Consistent locking policy */
+static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
+                                        struct ktermios *old_termios)
+{
+        struct tty_port *port = &state->port;
+        struct uart_port *uport = state->uart_port;
+        struct ktermios *termios;
+
+        /*
+         * If we have no tty, termios, or the port does not exist,
+         * then we can't set the parameters for this port.
+         */
+        if (!tty || !tty->termios || uport->type == PORT_UNKNOWN)
+                return;
+
+        termios = tty->termios;
+
+        /*
+         * Set flags based on termios cflag
+         */
+        if (termios->c_cflag & CRTSCTS)
+                set_bit(ASYNCB_CTS_FLOW, &port->flags);
+        else
+                clear_bit(ASYNCB_CTS_FLOW, &port->flags);
+
+        if (termios->c_cflag & CLOCAL)
+                clear_bit(ASYNCB_CHECK_CD, &port->flags);
+        else
+                set_bit(ASYNCB_CHECK_CD, &port->flags);
+
+        uport->ops->set_termios(uport, termios, old_termios);
+}
+
+static inline int __uart_put_char(struct uart_port *port,
+                                struct circ_buf *circ, unsigned char c)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        if (!circ->buf)
+                return 0;
+
+        spin_lock_irqsave(&port->lock, flags);
+        if (uart_circ_chars_free(circ) != 0) {
+                circ->buf[circ->head] = c;
+                circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);
+                ret = 1;
+        }
+        spin_unlock_irqrestore(&port->lock, flags);
+        return ret;
+}
+
+static int uart_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct uart_state *state = tty->driver_data;
+
+        return __uart_put_char(state->uart_port, &state->xmit, ch);
+}
+
+static void uart_flush_chars(struct tty_struct *tty)
+{
+        uart_start(tty);
+}
+
+static int uart_write(struct tty_struct *tty,
+                                        const unsigned char *buf, int count)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port;
+        struct circ_buf *circ;
+        unsigned long flags;
+        int c, ret = 0;
+
+        /*
+         * This means you called this function _after_ the port was
+         * closed.  No cookie for you.
+         */
+        if (!state) {
+                WARN_ON(1);
+                return -EL3HLT;
+        }
+
+        port = state->uart_port;
+        circ = &state->xmit;
+
+        if (!circ->buf)
+                return 0;
+
+        spin_lock_irqsave(&port->lock, flags);
+        while (1) {
+                c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
+                if (count < c)
+                        c = count;
+                if (c <= 0)
+                        break;
+                memcpy(circ->buf + circ->head, buf, c);
+                circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
+                buf += c;
+                count -= c;
+                ret += c;
+        }
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        uart_start(tty);
+        return ret;
+}
+
+static int uart_write_room(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        unsigned long flags;
+        int ret;
+
+        spin_lock_irqsave(&state->uart_port->lock, flags);
+        ret = uart_circ_chars_free(&state->xmit);
+        spin_unlock_irqrestore(&state->uart_port->lock, flags);
+        return ret;
+}
+
+static int uart_chars_in_buffer(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        unsigned long flags;
+        int ret;
+
+        spin_lock_irqsave(&state->uart_port->lock, flags);
+        ret = uart_circ_chars_pending(&state->xmit);
+        spin_unlock_irqrestore(&state->uart_port->lock, flags);
+        return ret;
+}
+
+static void uart_flush_buffer(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port;
+        unsigned long flags;
+
+        /*
+         * This means you called this function _after_ the port was
+         * closed.  No cookie for you.
+         */
+        if (!state) {
+                WARN_ON(1);
+                return;
+        }
+
+        port = state->uart_port;
+        pr_debug("uart_flush_buffer(%d) called\n", tty->index);
+
+        spin_lock_irqsave(&port->lock, flags);
+        uart_circ_clear(&state->xmit);
+        if (port->ops->flush_buffer)
+                port->ops->flush_buffer(port);
+        spin_unlock_irqrestore(&port->lock, flags);
+        tty_wakeup(tty);
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void uart_send_xchar(struct tty_struct *tty, char ch)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port = state->uart_port;
+        unsigned long flags;
+
+        if (port->ops->send_xchar)
+                port->ops->send_xchar(port, ch);
+        else {
+                port->x_char = ch;
+                if (ch) {
+                        spin_lock_irqsave(&port->lock, flags);
+                        port->ops->start_tx(port);
+                        spin_unlock_irqrestore(&port->lock, flags);
+                }
+        }
+}
+
+static void uart_throttle(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+
+        if (I_IXOFF(tty))
+                uart_send_xchar(tty, STOP_CHAR(tty));
+
+        if (tty->termios->c_cflag & CRTSCTS)
+                uart_clear_mctrl(state->uart_port, TIOCM_RTS);
+}
+
+static void uart_unthrottle(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port = state->uart_port;
+
+        if (I_IXOFF(tty)) {
+                if (port->x_char)
+                        port->x_char = 0;
+                else
+                        uart_send_xchar(tty, START_CHAR(tty));
+        }
+
+        if (tty->termios->c_cflag & CRTSCTS)
+                uart_set_mctrl(port, TIOCM_RTS);
+}
+
+static int uart_get_info(struct uart_state *state,
+                         struct serial_struct __user *retinfo)
+{
+        struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
+        struct serial_struct tmp;
+
+        memset(&tmp, 0, sizeof(tmp));
+
+        /* Ensure the state we copy is consistent and no hardware changes
+           occur as we go */
+        mutex_lock(&port->mutex);
+
+        tmp.type            = uport->type;
+        tmp.line            = uport->line;
+        tmp.port            = uport->iobase;
+        if (HIGH_BITS_OFFSET)
+                tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET;
+        tmp.irq             = uport->irq;
+        tmp.flags           = uport->flags;
+        tmp.xmit_fifo_size  = uport->fifosize;
+        tmp.baud_base       = uport->uartclk / 16;
+        tmp.close_delay     = port->close_delay / 10;
+        tmp.closing_wait    = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
+                                ASYNC_CLOSING_WAIT_NONE :
+                                port->closing_wait / 10;
+        tmp.custom_divisor  = uport->custom_divisor;
+        tmp.hub6            = uport->hub6;
+        tmp.io_type         = uport->iotype;
+        tmp.iomem_reg_shift = uport->regshift;
+        tmp.iomem_base      = (void *)(unsigned long)uport->mapbase;
+
+        mutex_unlock(&port->mutex);
+
+        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+                return -EFAULT;
+        return 0;
+}
+
+static int uart_set_info(struct tty_struct *tty, struct uart_state *state,
+                         struct serial_struct __user *newinfo)
+{
+        struct serial_struct new_serial;
+        struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
+        unsigned long new_port;
+        unsigned int change_irq, change_port, closing_wait;
+        unsigned int old_custom_divisor, close_delay;
+        upf_t old_flags, new_flags;
+        int retval = 0;
+
+        if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
+                return -EFAULT;
+
+        new_port = new_serial.port;
+        if (HIGH_BITS_OFFSET)
+                new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
+
+        new_serial.irq = irq_canonicalize(new_serial.irq);
+        close_delay = new_serial.close_delay * 10;
+        closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
+                        ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
+
+        /*
+         * This semaphore protects port->count.  It is also
+         * very useful to prevent opens.  Also, take the
+         * port configuration semaphore to make sure that a
+         * module insertion/removal doesn't change anything
+         * under us.
+         */
+        mutex_lock(&port->mutex);
+
+        change_irq  = !(uport->flags & UPF_FIXED_PORT)
+                && new_serial.irq != uport->irq;
+
+        /*
+         * Since changing the 'type' of the port changes its resource
+         * allocations, we should treat type changes the same as
+         * IO port changes.
+         */
+        change_port = !(uport->flags & UPF_FIXED_PORT)
+                && (new_port != uport->iobase ||
+                    (unsigned long)new_serial.iomem_base != uport->mapbase ||
+                    new_serial.hub6 != uport->hub6 ||
+                    new_serial.io_type != uport->iotype ||
+                    new_serial.iomem_reg_shift != uport->regshift ||
+                    new_serial.type != uport->type);
+
+        old_flags = uport->flags;
+        new_flags = new_serial.flags;
+        old_custom_divisor = uport->custom_divisor;
+
+        if (!capable(CAP_SYS_ADMIN)) {
+                retval = -EPERM;
+                if (change_irq || change_port ||
+                    (new_serial.baud_base != uport->uartclk / 16) ||
+                    (close_delay != port->close_delay) ||
+                    (closing_wait != port->closing_wait) ||
+                    (new_serial.xmit_fifo_size &&
+                     new_serial.xmit_fifo_size != uport->fifosize) ||
+                    (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0))
+                        goto exit;
+                uport->flags = ((uport->flags & ~UPF_USR_MASK) |
+                               (new_flags & UPF_USR_MASK));
+                uport->custom_divisor = new_serial.custom_divisor;
+                goto check_and_exit;
+        }
+
+        /*
+         * Ask the low level driver to verify the settings.
+         */
+        if (uport->ops->verify_port)
+                retval = uport->ops->verify_port(uport, &new_serial);
+
+        if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) ||
+            (new_serial.baud_base < 9600))
+                retval = -EINVAL;
+
+        if (retval)
+                goto exit;
+
+        if (change_port || change_irq) {
+                retval = -EBUSY;
+
+                /*
+                 * Make sure that we are the sole user of this port.
+                 */
+                if (tty_port_users(port) > 1)
+                        goto exit;
+
+                /*
+                 * We need to shutdown the serial port at the old
+                 * port/type/irq combination.
+                 */
+                uart_shutdown(tty, state);
+        }
+
+        if (change_port) {
+                unsigned long old_iobase, old_mapbase;
+                unsigned int old_type, old_iotype, old_hub6, old_shift;
+
+                old_iobase = uport->iobase;
+                old_mapbase = uport->mapbase;
+                old_type = uport->type;
+                old_hub6 = uport->hub6;
+                old_iotype = uport->iotype;
+                old_shift = uport->regshift;
+
+                /*
+                 * Free and release old regions
+                 */
+                if (old_type != PORT_UNKNOWN)
+                        uport->ops->release_port(uport);
+
+                uport->iobase = new_port;
+                uport->type = new_serial.type;
+                uport->hub6 = new_serial.hub6;
+                uport->iotype = new_serial.io_type;
+                uport->regshift = new_serial.iomem_reg_shift;
+                uport->mapbase = (unsigned long)new_serial.iomem_base;
+
+                /*
+                 * Claim and map the new regions
+                 */
+                if (uport->type != PORT_UNKNOWN) {
+                        retval = uport->ops->request_port(uport);
+                } else {
+                        /* Always success - Jean II */
+                        retval = 0;
+                }
+
+                /*
+                 * If we fail to request resources for the
+                 * new port, try to restore the old settings.
+                 */
+                if (retval && old_type != PORT_UNKNOWN) {
+                        uport->iobase = old_iobase;
+                        uport->type = old_type;
+                        uport->hub6 = old_hub6;
+                        uport->iotype = old_iotype;
+                        uport->regshift = old_shift;
+                        uport->mapbase = old_mapbase;
+                        retval = uport->ops->request_port(uport);
+                        /*
+                         * If we failed to restore the old settings,
+                         * we fail like this.
+                         */
+                        if (retval)
+                                uport->type = PORT_UNKNOWN;
+
+                        /*
+                         * We failed anyway.
+                         */
+                        retval = -EBUSY;
+                        /* Added to return the correct error -Ram Gupta */
+                        goto exit;
+                }
+        }
+
+        if (change_irq)
+                uport->irq      = new_serial.irq;
+        if (!(uport->flags & UPF_FIXED_PORT))
+                uport->uartclk  = new_serial.baud_base * 16;
+        uport->flags            = (uport->flags & ~UPF_CHANGE_MASK) |
+                                 (new_flags & UPF_CHANGE_MASK);
+        uport->custom_divisor   = new_serial.custom_divisor;
+        port->close_delay     = close_delay;
+        port->closing_wait    = closing_wait;
+        if (new_serial.xmit_fifo_size)
+                uport->fifosize = new_serial.xmit_fifo_size;
+        if (port->tty)
+                port->tty->low_latency =
+                        (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
+
+ check_and_exit:
+        retval = 0;
+        if (uport->type == PORT_UNKNOWN)
+                goto exit;
+        if (port->flags & ASYNC_INITIALIZED) {
+                if (((old_flags ^ uport->flags) & UPF_SPD_MASK) ||
+                    old_custom_divisor != uport->custom_divisor) {
+                        /*
+                         * If they're setting up a custom divisor or speed,
+                         * instead of clearing it, then bitch about it. No
+                         * need to rate-limit; it's CAP_SYS_ADMIN only.
+                         */
+                        if (uport->flags & UPF_SPD_MASK) {
+                                char buf[64];
+                                printk(KERN_NOTICE
+                                       "%s sets custom speed on %s. This "
+                                       "is deprecated.\n", current->comm,
+                                       tty_name(port->tty, buf));
+                        }
+                        uart_change_speed(tty, state, NULL);
+                }
+        } else
+                retval = uart_startup(tty, state, 1);
+ exit:
+        mutex_unlock(&port->mutex);
+        return retval;
+}
+
+/**
+ *      uart_get_lsr_info       -       get line status register info
+ *      @tty: tty associated with the UART
+ *      @state: UART being queried
+ *      @value: returned modem value
+ *
+ *      Note: uart_ioctl protects us against hangups.
+ */
+static int uart_get_lsr_info(struct tty_struct *tty,
+                        struct uart_state *state, unsigned int __user *value)
+{
+        struct uart_port *uport = state->uart_port;
+        unsigned int result;
+
+        result = uport->ops->tx_empty(uport);
+
+        /*
+         * If we're about to load something into the transmit
+         * register, we'll pretend the transmitter isn't empty to
+         * avoid a race condition (depending on when the transmit
+         * interrupt happens).
+         */
+        if (uport->x_char ||
+            ((uart_circ_chars_pending(&state->xmit) > 0) &&
+             !tty->stopped && !tty->hw_stopped))
+                result &= ~TIOCSER_TEMT;
+
+        return put_user(result, value);
+}
+
+static int uart_tiocmget(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct tty_port *port = &state->port;
+        struct uart_port *uport = state->uart_port;
+        int result = -EIO;
+
+        mutex_lock(&port->mutex);
+        if (!(tty->flags & (1 << TTY_IO_ERROR))) {
+                result = uport->mctrl;
+                spin_lock_irq(&uport->lock);
+                result |= uport->ops->get_mctrl(uport);
+                spin_unlock_irq(&uport->lock);
+        }
+        mutex_unlock(&port->mutex);
+
+        return result;
+}
+
+static int
+uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
+        int ret = -EIO;
+
+        mutex_lock(&port->mutex);
+        if (!(tty->flags & (1 << TTY_IO_ERROR))) {
+                uart_update_mctrl(uport, set, clear);
+                ret = 0;
+        }
+        mutex_unlock(&port->mutex);
+        return ret;
+}
+
+static int uart_break_ctl(struct tty_struct *tty, int break_state)
+{
+        struct uart_state *state = tty->driver_data;
+        struct tty_port *port = &state->port;
+        struct uart_port *uport = state->uart_port;
+
+        mutex_lock(&port->mutex);
+
+        if (uport->type != PORT_UNKNOWN)
+                uport->ops->break_ctl(uport, break_state);
+
+        mutex_unlock(&port->mutex);
+        return 0;
+}
+
+static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
+{
+        struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
+        int flags, ret;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        /*
+         * Take the per-port semaphore.  This prevents count from
+         * changing, and hence any extra opens of the port while
+         * we're auto-configuring.
+         */
+        if (mutex_lock_interruptible(&port->mutex))
+                return -ERESTARTSYS;
+
+        ret = -EBUSY;
+        if (tty_port_users(port) == 1) {
+                uart_shutdown(tty, state);
+
+                /*
+                 * If we already have a port type configured,
+                 * we must release its resources.
+                 */
+                if (uport->type != PORT_UNKNOWN)
+                        uport->ops->release_port(uport);
+
+                flags = UART_CONFIG_TYPE;
+                if (uport->flags & UPF_AUTO_IRQ)
+                        flags |= UART_CONFIG_IRQ;
+
+                /*
+                 * This will claim the ports resources if
+                 * a port is found.
+                 */
+                uport->ops->config_port(uport, flags);
+
+                ret = uart_startup(tty, state, 1);
+        }
+        mutex_unlock(&port->mutex);
+        return ret;
+}
+
+/*
+ * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
+ * - mask passed in arg for lines of interest
+ *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+ * Caller should use TIOCGICOUNT to see which one it was
+ *
+ * FIXME: This wants extracting into a common all driver implementation
+ * of TIOCMWAIT using tty_port.
+ */
+static int
+uart_wait_modem_status(struct uart_state *state, unsigned long arg)
+{
+        struct uart_port *uport = state->uart_port;
+        struct tty_port *port = &state->port;
+        DECLARE_WAITQUEUE(wait, current);
+        struct uart_icount cprev, cnow;
+        int ret;
+
+        /*
+         * note the counters on entry
+         */
+        spin_lock_irq(&uport->lock);
+        memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
+
+        /*
+         * Force modem status interrupts on
+         */
+        uport->ops->enable_ms(uport);
+        spin_unlock_irq(&uport->lock);
+
+        add_wait_queue(&port->delta_msr_wait, &wait);
+        for (;;) {
+                spin_lock_irq(&uport->lock);
+                memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
+                spin_unlock_irq(&uport->lock);
+
+                set_current_state(TASK_INTERRUPTIBLE);
+
+                if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
+                    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
+                    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
+                    ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
+                        ret = 0;
+                        break;
+                }
+
+                schedule();
+
+                /* see if a signal did it */
+                if (signal_pending(current)) {
+                        ret = -ERESTARTSYS;
+                        break;
+                }
+
+                cprev = cnow;
+        }
+
+        current->state = TASK_RUNNING;
+        remove_wait_queue(&port->delta_msr_wait, &wait);
+
+        return ret;
+}
+
+/*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ *     RI where only 0->1 is counted.
+ */
+static int uart_get_icount(struct tty_struct *tty,
+                          struct serial_icounter_struct *icount)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_icount cnow;
+        struct uart_port *uport = state->uart_port;
+
+        spin_lock_irq(&uport->lock);
+        memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
+        spin_unlock_irq(&uport->lock);
+
+        icount->cts         = cnow.cts;
+        icount->dsr         = cnow.dsr;
+        icount->rng         = cnow.rng;
+        icount->dcd         = cnow.dcd;
+        icount->rx          = cnow.rx;
+        icount->tx          = cnow.tx;
+        icount->frame       = cnow.frame;
+        icount->overrun     = cnow.overrun;
+        icount->parity      = cnow.parity;
+        icount->brk         = cnow.brk;
+        icount->buf_overrun = cnow.buf_overrun;
+
+        return 0;
+}
+
+/*
+ * Called via sys_ioctl.  We can use spin_lock_irq() here.
+ */
+static int
+uart_ioctl(struct tty_struct *tty, unsigned int cmd,
+           unsigned long arg)
+{
+        struct uart_state *state = tty->driver_data;
+        struct tty_port *port = &state->port;
+        void __user *uarg = (void __user *)arg;
+        int ret = -ENOIOCTLCMD;
+
+
+        /*
+         * These ioctls don't rely on the hardware to be present.
+         */
+        switch (cmd) {
+        case TIOCGSERIAL:
+                ret = uart_get_info(state, uarg);
+                break;
+
+        case TIOCSSERIAL:
+                ret = uart_set_info(tty, state, uarg);
+                break;
+
+        case TIOCSERCONFIG:
+                ret = uart_do_autoconfig(tty, state);
+                break;
+
+        case TIOCSERGWILD: /* obsolete */
+        case TIOCSERSWILD: /* obsolete */
+                ret = 0;
+                break;
+        }
+
+        if (ret != -ENOIOCTLCMD)
+                goto out;
+
+        if (tty->flags & (1 << TTY_IO_ERROR)) {
+                ret = -EIO;
+                goto out;
+        }
+
+        /*
+         * The following should only be used when hardware is present.
+         */
+        switch (cmd) {
+        case TIOCMIWAIT:
+                ret = uart_wait_modem_status(state, arg);
+                break;
+        }
+
+        if (ret != -ENOIOCTLCMD)
+                goto out;
+
+        mutex_lock(&port->mutex);
+
+        if (tty->flags & (1 << TTY_IO_ERROR)) {
+                ret = -EIO;
+                goto out_up;
+        }
+
+        /*
+         * All these rely on hardware being present and need to be
+         * protected against the tty being hung up.
+         */
+        switch (cmd) {
+        case TIOCSERGETLSR: /* Get line status register */
+                ret = uart_get_lsr_info(tty, state, uarg);
+                break;
+
+        default: {
+                struct uart_port *uport = state->uart_port;
+                if (uport->ops->ioctl)
+                        ret = uport->ops->ioctl(uport, cmd, arg);
+                break;
+        }
+        }
+out_up:
+        mutex_unlock(&port->mutex);
+out:
+        return ret;
+}
+
+static void uart_set_ldisc(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *uport = state->uart_port;
+
+        if (uport->ops->set_ldisc)
+                uport->ops->set_ldisc(uport, tty->termios->c_line);
+}
+
+static void uart_set_termios(struct tty_struct *tty,
+                                                struct ktermios *old_termios)
+{
+        struct uart_state *state = tty->driver_data;
+        unsigned long flags;
+        unsigned int cflag = tty->termios->c_cflag;
+
+
+        /*
+         * These are the bits that are used to setup various
+         * flags in the low level driver. We can ignore the Bfoo
+         * bits in c_cflag; c_[io]speed will always be set
+         * appropriately by set_termios() in tty_ioctl.c
+         */
+#define RELEVANT_IFLAG(iflag)   ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+        if ((cflag ^ old_termios->c_cflag) == 0 &&
+            tty->termios->c_ospeed == old_termios->c_ospeed &&
+            tty->termios->c_ispeed == old_termios->c_ispeed &&
+            RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) {
+                return;
+        }
+
+        uart_change_speed(tty, state, old_termios);
+
+        /* Handle transition to B0 status */
+        if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
+                uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR);
+        /* Handle transition away from B0 status */
+        else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
+                unsigned int mask = TIOCM_DTR;
+                if (!(cflag & CRTSCTS) ||
+                    !test_bit(TTY_THROTTLED, &tty->flags))
+                        mask |= TIOCM_RTS;
+                uart_set_mctrl(state->uart_port, mask);
+        }
+
+        /* Handle turning off CRTSCTS */
+        if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
+                spin_lock_irqsave(&state->uart_port->lock, flags);
+                tty->hw_stopped = 0;
+                __uart_start(tty);
+                spin_unlock_irqrestore(&state->uart_port->lock, flags);
+        }
+        /* Handle turning on CRTSCTS */
+        else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
+                spin_lock_irqsave(&state->uart_port->lock, flags);
+                if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) {
+                        tty->hw_stopped = 1;
+                        state->uart_port->ops->stop_tx(state->uart_port);
+                }
+                spin_unlock_irqrestore(&state->uart_port->lock, flags);
+        }
+}
+
+/*
+ * In 2.4.5, calls to this will be serialized via the BKL in
+ *  linux/drivers/char/tty_io.c:tty_release()
+ *  linux/drivers/char/tty_io.c:do_tty_handup()
+ */
+static void uart_close(struct tty_struct *tty, struct file *filp)
+{
+        struct uart_state *state = tty->driver_data;
+        struct tty_port *port;
+        struct uart_port *uport;
+        unsigned long flags;
+
+        BUG_ON(!tty_locked());
+
+        if (!state)
+                return;
+
+        uport = state->uart_port;
+        port = &state->port;
+
+        pr_debug("uart_close(%d) called\n", uport->line);
+
+        mutex_lock(&port->mutex);
+        spin_lock_irqsave(&port->lock, flags);
+
+        if (tty_hung_up_p(filp)) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                goto done;
+        }
+
+        if ((tty->count == 1) && (port->count != 1)) {
+                /*
+                 * Uh, oh.  tty->count is 1, which means that the tty
+                 * structure will be freed.  port->count should always
+                 * be one in these conditions.  If it's greater than
+                 * one, we've got real problems, since it means the
+                 * serial port won't be shutdown.
+                 */
+                printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, "
+                       "port->count is %d\n", port->count);
+                port->count = 1;
+        }
+        if (--port->count < 0) {
+                printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n",
+                       tty->name, port->count);
+                port->count = 0;
+        }
+        if (port->count) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                goto done;
+        }
+
+        /*
+         * Now we wait for the transmit buffer to clear; and we notify
+         * the line discipline to only process XON/XOFF characters by
+         * setting tty->closing.
+         */
+        tty->closing = 1;
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
+                /*
+                 * hack: open-coded tty_wait_until_sent to avoid
+                 * recursive tty_lock
+                 */
+                long timeout = msecs_to_jiffies(port->closing_wait);
+                if (wait_event_interruptible_timeout(tty->write_wait,
+                                !tty_chars_in_buffer(tty), timeout) >= 0)
+                        __uart_wait_until_sent(uport, timeout);
+        }
+
+        /*
+         * At this point, we stop accepting input.  To do this, we
+         * disable the receive line status interrupts.
+         */
+        if (port->flags & ASYNC_INITIALIZED) {
+                unsigned long flags;
+                spin_lock_irqsave(&uport->lock, flags);
+                uport->ops->stop_rx(uport);
+                spin_unlock_irqrestore(&uport->lock, flags);
+                /*
+                 * Before we drop DTR, make sure the UART transmitter
+                 * has completely drained; this is especially
+                 * important if there is a transmit FIFO!
+                 */
+                __uart_wait_until_sent(uport, uport->timeout);
+        }
+
+        uart_shutdown(tty, state);
+        uart_flush_buffer(tty);
+
+        tty_ldisc_flush(tty);
+
+        tty_port_tty_set(port, NULL);
+        spin_lock_irqsave(&port->lock, flags);
+        tty->closing = 0;
+
+        if (port->blocked_open) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                if (port->close_delay)
+                        msleep_interruptible(port->close_delay);
+                spin_lock_irqsave(&port->lock, flags);
+        } else if (!uart_console(uport)) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                uart_change_pm(state, 3);
+                spin_lock_irqsave(&port->lock, flags);
+        }
+
+        /*
+         * Wake up anyone trying to open this port.
+         */
+        clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
+        spin_unlock_irqrestore(&port->lock, flags);
+        wake_up_interruptible(&port->open_wait);
+
+done:
+        mutex_unlock(&port->mutex);
+}
+
+static void __uart_wait_until_sent(struct uart_port *port, int timeout)
+{
+        unsigned long char_time, expire;
+
+        if (port->type == PORT_UNKNOWN || port->fifosize == 0)
+                return;
+
+        /*
+         * Set the check interval to be 1/5 of the estimated time to
+         * send a single character, and make it at least 1.  The check
+         * interval should also be less than the timeout.
+         *
+         * Note: we have to use pretty tight timings here to satisfy
+         * the NIST-PCTS.
+         */
+        char_time = (port->timeout - HZ/50) / port->fifosize;
+        char_time = char_time / 5;
+        if (char_time == 0)
+                char_time = 1;
+        if (timeout && timeout < char_time)
+                char_time = timeout;
+
+        /*
+         * If the transmitter hasn't cleared in twice the approximate
+         * amount of time to send the entire FIFO, it probably won't
+         * ever clear.  This assumes the UART isn't doing flow
+         * control, which is currently the case.  Hence, if it ever
+         * takes longer than port->timeout, this is probably due to a
+         * UART bug of some kind.  So, we clamp the timeout parameter at
+         * 2*port->timeout.
+         */
+        if (timeout == 0 || timeout > 2 * port->timeout)
+                timeout = 2 * port->timeout;
+
+        expire = jiffies + timeout;
+
+        pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n",
+                port->line, jiffies, expire);
+
+        /*
+         * Check whether the transmitter is empty every 'char_time'.
+         * 'timeout' / 'expire' give us the maximum amount of time
+         * we wait.
+         */
+        while (!port->ops->tx_empty(port)) {
+                msleep_interruptible(jiffies_to_msecs(char_time));
+                if (signal_pending(current))
+                        break;
+                if (time_after(jiffies, expire))
+                        break;
+        }
+}
+
+static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        struct uart_state *state = tty->driver_data;
+        struct uart_port *port = state->uart_port;
+
+        tty_lock();
+        __uart_wait_until_sent(port, timeout);
+        tty_unlock();
+}
+
+/*
+ * This is called with the BKL held in
+ *  linux/drivers/char/tty_io.c:do_tty_hangup()
+ * We're called from the eventd thread, so we can sleep for
+ * a _short_ time only.
+ */
+static void uart_hangup(struct tty_struct *tty)
+{
+        struct uart_state *state = tty->driver_data;
+        struct tty_port *port = &state->port;
+        unsigned long flags;
+
+        BUG_ON(!tty_locked());
+        pr_debug("uart_hangup(%d)\n", state->uart_port->line);
+
+        mutex_lock(&port->mutex);
+        if (port->flags & ASYNC_NORMAL_ACTIVE) {
+                uart_flush_buffer(tty);
+                uart_shutdown(tty, state);
+                spin_lock_irqsave(&port->lock, flags);
+                port->count = 0;
+                clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
+                spin_unlock_irqrestore(&port->lock, flags);
+                tty_port_tty_set(port, NULL);
+                wake_up_interruptible(&port->open_wait);
+                wake_up_interruptible(&port->delta_msr_wait);
+        }
+        mutex_unlock(&port->mutex);
+}
+
+static int uart_carrier_raised(struct tty_port *port)
+{
+        struct uart_state *state = container_of(port, struct uart_state, port);
+        struct uart_port *uport = state->uart_port;
+        int mctrl;
+        spin_lock_irq(&uport->lock);
+        uport->ops->enable_ms(uport);
+        mctrl = uport->ops->get_mctrl(uport);
+        spin_unlock_irq(&uport->lock);
+        if (mctrl & TIOCM_CAR)
+                return 1;
+        return 0;
+}
+
+static void uart_dtr_rts(struct tty_port *port, int onoff)
+{
+        struct uart_state *state = container_of(port, struct uart_state, port);
+        struct uart_port *uport = state->uart_port;
+
+        if (onoff)
+                uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
+        else
+                uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
+}
+
+static struct uart_state *uart_get(struct uart_driver *drv, int line)
+{
+        struct uart_state *state;
+        struct tty_port *port;
+        int ret = 0;
+
+        state = drv->state + line;
+        port = &state->port;
+        if (mutex_lock_interruptible(&port->mutex)) {
+                ret = -ERESTARTSYS;
+                goto err;
+        }
+
+        port->count++;
+        if (!state->uart_port || state->uart_port->flags & UPF_DEAD) {
+                ret = -ENXIO;
+                goto err_unlock;
+        }
+        return state;
+
+ err_unlock:
+        port->count--;
+        mutex_unlock(&port->mutex);
+ err:
+        return ERR_PTR(ret);
+}
+
+/*
+ * calls to uart_open are serialised by the BKL in
+ *   fs/char_dev.c:chrdev_open()
+ * Note that if this fails, then uart_close() _will_ be called.
+ *
+ * In time, we want to scrap the "opening nonpresent ports"
+ * behaviour and implement an alternative way for setserial
+ * to set base addresses/ports/types.  This will allow us to
+ * get rid of a certain amount of extra tests.
+ */
+static int uart_open(struct tty_struct *tty, struct file *filp)
+{
+        struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state;
+        struct uart_state *state;
+        struct tty_port *port;
+        int retval, line = tty->index;
+
+        BUG_ON(!tty_locked());
+        pr_debug("uart_open(%d) called\n", line);
+
+        /*
+         * We take the semaphore inside uart_get to guarantee that we won't
+         * be re-entered while allocating the state structure, or while we
+         * request any IRQs that the driver may need.  This also has the nice
+         * side-effect that it delays the action of uart_hangup, so we can
+         * guarantee that state->port.tty will always contain something
+         * reasonable.
+         */
+        state = uart_get(drv, line);
+        if (IS_ERR(state)) {
+                retval = PTR_ERR(state);
+                goto fail;
+        }
+        port = &state->port;
+
+        /*
+         * Once we set tty->driver_data here, we are guaranteed that
+         * uart_close() will decrement the driver module use count.
+         * Any failures from here onwards should not touch the count.
+         */
+        tty->driver_data = state;
+        state->uart_port->state = state;
+        tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0;
+        tty->alt_speed = 0;
+        tty_port_tty_set(port, tty);
+
+        /*
+         * If the port is in the middle of closing, bail out now.
+         */
+        if (tty_hung_up_p(filp)) {
+                retval = -EAGAIN;
+                port->count--;
+                mutex_unlock(&port->mutex);
+                goto fail;
+        }
+
+        /*
+         * Make sure the device is in D0 state.
+         */
+        if (port->count == 1)
+                uart_change_pm(state, 0);
+
+        /*
+         * Start up the serial port.
+         */
+        retval = uart_startup(tty, state, 0);
+
+        /*
+         * If we succeeded, wait until the port is ready.
+         */
+        mutex_unlock(&port->mutex);
+        if (retval == 0)
+                retval = tty_port_block_til_ready(port, tty, filp);
+
+fail:
+        return retval;
+}
+
+static const char *uart_type(struct uart_port *port)
+{
+        const char *str = NULL;
+
+        if (port->ops->type)
+                str = port->ops->type(port);
+
+        if (!str)
+                str = "unknown";
+
+        return str;
+}
+
+#ifdef CONFIG_PROC_FS
+
+static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i)
+{
+        struct uart_state *state = drv->state + i;
+        struct tty_port *port = &state->port;
+        int pm_state;
+        struct uart_port *uport = state->uart_port;
+        char stat_buf[32];
+        unsigned int status;
+        int mmio;
+
+        if (!uport)
+                return;
+
+        mmio = uport->iotype >= UPIO_MEM;
+        seq_printf(m, "%d: uart:%s %s%08llX irq:%d",
+                        uport->line, uart_type(uport),
+                        mmio ? "mmio:0x" : "port:",
+                        mmio ? (unsigned long long)uport->mapbase
+                             : (unsigned long long)uport->iobase,
+                        uport->irq);
+
+        if (uport->type == PORT_UNKNOWN) {
+                seq_putc(m, '\n');
+                return;
+        }
+
+        if (capable(CAP_SYS_ADMIN)) {
+                mutex_lock(&port->mutex);
+                pm_state = state->pm_state;
+                if (pm_state)
+                        uart_change_pm(state, 0);
+                spin_lock_irq(&uport->lock);
+                status = uport->ops->get_mctrl(uport);
+                spin_unlock_irq(&uport->lock);
+                if (pm_state)
+                        uart_change_pm(state, pm_state);
+                mutex_unlock(&port->mutex);
+
+                seq_printf(m, " tx:%d rx:%d",
+                                uport->icount.tx, uport->icount.rx);
+                if (uport->icount.frame)
+                        seq_printf(m, " fe:%d",
+                                uport->icount.frame);
+                if (uport->icount.parity)
+                        seq_printf(m, " pe:%d",
+                                uport->icount.parity);
+                if (uport->icount.brk)
+                        seq_printf(m, " brk:%d",
+                                uport->icount.brk);
+                if (uport->icount.overrun)
+                        seq_printf(m, " oe:%d",
+                                uport->icount.overrun);
+
+#define INFOBIT(bit, str) \
+        if (uport->mctrl & (bit)) \
+                strncat(stat_buf, (str), sizeof(stat_buf) - \
+                        strlen(stat_buf) - 2)
+#define STATBIT(bit, str) \
+        if (status & (bit)) \
+                strncat(stat_buf, (str), sizeof(stat_buf) - \
+                       strlen(stat_buf) - 2)
+
+                stat_buf[0] = '\0';
+                stat_buf[1] = '\0';
+                INFOBIT(TIOCM_RTS, "|RTS");
+                STATBIT(TIOCM_CTS, "|CTS");
+                INFOBIT(TIOCM_DTR, "|DTR");
+                STATBIT(TIOCM_DSR, "|DSR");
+                STATBIT(TIOCM_CAR, "|CD");
+                STATBIT(TIOCM_RNG, "|RI");
+                if (stat_buf[0])
+                        stat_buf[0] = ' ';
+
+                seq_puts(m, stat_buf);
+        }
+        seq_putc(m, '\n');
+#undef STATBIT
+#undef INFOBIT
+}
+
+static int uart_proc_show(struct seq_file *m, void *v)
+{
+        struct tty_driver *ttydrv = m->private;
+        struct uart_driver *drv = ttydrv->driver_state;
+        int i;
+
+        seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
+                        "", "", "");
+        for (i = 0; i < drv->nr; i++)
+                uart_line_info(m, drv, i);
+        return 0;
+}
+
+static int uart_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, uart_proc_show, PDE(inode)->data);
+}
+
+static const struct file_operations uart_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = uart_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+#endif
+
+#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
+/*
+ *      uart_console_write - write a console message to a serial port
+ *      @port: the port to write the message
+ *      @s: array of characters
+ *      @count: number of characters in string to write
+ *      @write: function to write character to port
+ */
+void uart_console_write(struct uart_port *port, const char *s,
+                        unsigned int count,
+                        void (*putchar)(struct uart_port *, int))
+{
+        unsigned int i;
+
+        for (i = 0; i < count; i++, s++) {
+                if (*s == '\n')
+                        putchar(port, '\r');
+                putchar(port, *s);
+        }
+}
+EXPORT_SYMBOL_GPL(uart_console_write);
+
+/*
+ *      Check whether an invalid uart number has been specified, and
+ *      if so, search for the first available port that does have
+ *      console support.
+ */
+struct uart_port * __init
+uart_get_console(struct uart_port *ports, int nr, struct console *co)
+{
+        int idx = co->index;
+
+        if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 &&
+                                     ports[idx].membase == NULL))
+                for (idx = 0; idx < nr; idx++)
+                        if (ports[idx].iobase != 0 ||
+                            ports[idx].membase != NULL)
+                                break;
+
+        co->index = idx;
+
+        return ports + idx;
+}
+
+/**
+ *      uart_parse_options - Parse serial port baud/parity/bits/flow contro.
+ *      @options: pointer to option string
+ *      @baud: pointer to an 'int' variable for the baud rate.
+ *      @parity: pointer to an 'int' variable for the parity.
+ *      @bits: pointer to an 'int' variable for the number of data bits.
+ *      @flow: pointer to an 'int' variable for the flow control character.
+ *
+ *      uart_parse_options decodes a string containing the serial console
+ *      options.  The format of the string is <baud><parity><bits><flow>,
+ *      eg: 115200n8r
+ */
+void
+uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow)
+{
+        char *s = options;
+
+        *baud = simple_strtoul(s, NULL, 10);
+        while (*s >= '0' && *s <= '9')
+                s++;
+        if (*s)
+                *parity = *s++;
+        if (*s)
+                *bits = *s++ - '0';
+        if (*s)
+                *flow = *s;
+}
+EXPORT_SYMBOL_GPL(uart_parse_options);
+
+struct baud_rates {
+        unsigned int rate;
+        unsigned int cflag;
+};
+
+static const struct baud_rates baud_rates[] = {
+        { 921600, B921600 },
+        { 460800, B460800 },
+        { 230400, B230400 },
+        { 115200, B115200 },
+        {  57600, B57600  },
+        {  38400, B38400  },
+        {  19200, B19200  },
+        {   9600, B9600   },
+        {   4800, B4800   },
+        {   2400, B2400   },
+        {   1200, B1200   },
+        {      0, B38400  }
+};
+
+/**
+ *      uart_set_options - setup the serial console parameters
+ *      @port: pointer to the serial ports uart_port structure
+ *      @co: console pointer
+ *      @baud: baud rate
+ *      @parity: parity character - 'n' (none), 'o' (odd), 'e' (even)
+ *      @bits: number of data bits
+ *      @flow: flow control character - 'r' (rts)
+ */
+int
+uart_set_options(struct uart_port *port, struct console *co,
+                 int baud, int parity, int bits, int flow)
+{
+        struct ktermios termios;
+        static struct ktermios dummy;
+        int i;
+
+        /*
+         * Ensure that the serial console lock is initialised
+         * early.
+         */
+        spin_lock_init(&port->lock);
+        lockdep_set_class(&port->lock, &port_lock_key);
+
+        memset(&termios, 0, sizeof(struct ktermios));
+
+        termios.c_cflag = CREAD | HUPCL | CLOCAL;
+
+        /*
+         * Construct a cflag setting.
+         */
+        for (i = 0; baud_rates[i].rate; i++)
+                if (baud_rates[i].rate <= baud)
+                        break;
+
+        termios.c_cflag |= baud_rates[i].cflag;
+
+        if (bits == 7)
+                termios.c_cflag |= CS7;
+        else
+                termios.c_cflag |= CS8;
+
+        switch (parity) {
+        case 'o': case 'O':
+                termios.c_cflag |= PARODD;
+                /*fall through*/
+        case 'e': case 'E':
+                termios.c_cflag |= PARENB;
+                break;
+        }
+
+        if (flow == 'r')
+                termios.c_cflag |= CRTSCTS;
+
+        /*
+         * some uarts on other side don't support no flow control.
+         * So we set * DTR in host uart to make them happy
+         */
+        port->mctrl |= TIOCM_DTR;
+
+        port->ops->set_termios(port, &termios, &dummy);
+        /*
+         * Allow the setting of the UART parameters with a NULL console
+         * too:
+         */
+        if (co)
+                co->cflag = termios.c_cflag;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(uart_set_options);
+#endif /* CONFIG_SERIAL_CORE_CONSOLE */
+
+static void uart_change_pm(struct uart_state *state, int pm_state)
+{
+        struct uart_port *port = state->uart_port;
+
+        if (state->pm_state != pm_state) {
+                if (port->ops->pm)
+                        port->ops->pm(port, pm_state, state->pm_state);
+                state->pm_state = pm_state;
+        }
+}
+
+struct uart_match {
+        struct uart_port *port;
+        struct uart_driver *driver;
+};
+
+static int serial_match_port(struct device *dev, void *data)
+{
+        struct uart_match *match = data;
+        struct tty_driver *tty_drv = match->driver->tty_driver;
+        dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) +
+                match->port->line;
+
+        return dev->devt == devt; /* Actually, only one tty per port */
+}
+
+int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
+{
+        struct uart_state *state = drv->state + uport->line;
+        struct tty_port *port = &state->port;
+        struct device *tty_dev;
+        struct uart_match match = {uport, drv};
+
+        mutex_lock(&port->mutex);
+
+        tty_dev = device_find_child(uport->dev, &match, serial_match_port);
+        if (device_may_wakeup(tty_dev)) {
+                if (!enable_irq_wake(uport->irq))
+                        uport->irq_wake = 1;
+                put_device(tty_dev);
+                mutex_unlock(&port->mutex);
+                return 0;
+        }
+        if (console_suspend_enabled || !uart_console(uport))
+                uport->suspended = 1;
+
+        if (port->flags & ASYNC_INITIALIZED) {
+                const struct uart_ops *ops = uport->ops;
+                int tries;
+
+                if (console_suspend_enabled || !uart_console(uport)) {
+                        set_bit(ASYNCB_SUSPENDED, &port->flags);
+                        clear_bit(ASYNCB_INITIALIZED, &port->flags);
+
+                        spin_lock_irq(&uport->lock);
+                        ops->stop_tx(uport);
+                        ops->set_mctrl(uport, 0);
+                        ops->stop_rx(uport);
+                        spin_unlock_irq(&uport->lock);
+                }
+
+                /*
+                 * Wait for the transmitter to empty.
+                 */
+                for (tries = 3; !ops->tx_empty(uport) && tries; tries--)
+                        msleep(10);
+                if (!tries)
+                        printk(KERN_ERR "%s%s%s%d: Unable to drain "
+                                        "transmitter\n",
+                               uport->dev ? dev_name(uport->dev) : "",
+                               uport->dev ? ": " : "",
+                               drv->dev_name,
+                               drv->tty_driver->name_base + uport->line);
+
+                if (console_suspend_enabled || !uart_console(uport))
+                        ops->shutdown(uport);
+        }
+
+        /*
+         * Disable the console device before suspending.
+         */
+        if (console_suspend_enabled && uart_console(uport))
+                console_stop(uport->cons);
+
+        if (console_suspend_enabled || !uart_console(uport))
+                uart_change_pm(state, 3);
+
+        mutex_unlock(&port->mutex);
+
+        return 0;
+}
+
+int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
+{
+        struct uart_state *state = drv->state + uport->line;
+        struct tty_port *port = &state->port;
+        struct device *tty_dev;
+        struct uart_match match = {uport, drv};
+        struct ktermios termios;
+
+        mutex_lock(&port->mutex);
+
+        tty_dev = device_find_child(uport->dev, &match, serial_match_port);
+        if (!uport->suspended && device_may_wakeup(tty_dev)) {
+                if (uport->irq_wake) {
+                        disable_irq_wake(uport->irq);
+                        uport->irq_wake = 0;
+                }
+                mutex_unlock(&port->mutex);
+                return 0;
+        }
+        uport->suspended = 0;
+
+        /*
+         * Re-enable the console device after suspending.
+         */
+        if (uart_console(uport)) {
+                /*
+                 * First try to use the console cflag setting.
+                 */
+                memset(&termios, 0, sizeof(struct ktermios));
+                termios.c_cflag = uport->cons->cflag;
+
+                /*
+                 * If that's unset, use the tty termios setting.
+                 */
+                if (port->tty && port->tty->termios && termios.c_cflag == 0)
+                        termios = *(port->tty->termios);
+
+                uport->ops->set_termios(uport, &termios, NULL);
+                if (console_suspend_enabled)
+                        console_start(uport->cons);
+        }
+
+        if (port->flags & ASYNC_SUSPENDED) {
+                const struct uart_ops *ops = uport->ops;
+                int ret;
+
+                uart_change_pm(state, 0);
+                spin_lock_irq(&uport->lock);
+                ops->set_mctrl(uport, 0);
+                spin_unlock_irq(&uport->lock);
+                if (console_suspend_enabled || !uart_console(uport)) {
+                        /* Protected by port mutex for now */
+                        struct tty_struct *tty = port->tty;
+                        ret = ops->startup(uport);
+                        if (ret == 0) {
+                                if (tty)
+                                        uart_change_speed(tty, state, NULL);
+                                spin_lock_irq(&uport->lock);
+                                ops->set_mctrl(uport, uport->mctrl);
+                                ops->start_tx(uport);
+                                spin_unlock_irq(&uport->lock);
+                                set_bit(ASYNCB_INITIALIZED, &port->flags);
+                        } else {
+                                /*
+                                 * Failed to resume - maybe hardware went away?
+                                 * Clear the "initialized" flag so we won't try
+                                 * to call the low level drivers shutdown method.
+                                 */
+                                uart_shutdown(tty, state);
+                        }
+                }
+
+                clear_bit(ASYNCB_SUSPENDED, &port->flags);
+        }
+
+        mutex_unlock(&port->mutex);
+
+        return 0;
+}
+
+static inline void
+uart_report_port(struct uart_driver *drv, struct uart_port *port)
+{
+        char address[64];
+
+        switch (port->iotype) {
+        case UPIO_PORT:
+                snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase);
+                break;
+        case UPIO_HUB6:
+                snprintf(address, sizeof(address),
+                         "I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
+                break;
+        case UPIO_MEM:
+        case UPIO_MEM32:
+        case UPIO_AU:
+        case UPIO_TSI:
+        case UPIO_DWAPB:
+        case UPIO_DWAPB32:
+                snprintf(address, sizeof(address),
+                         "MMIO 0x%llx", (unsigned long long)port->mapbase);
+                break;
+        default:
+                strlcpy(address, "*unknown*", sizeof(address));
+                break;
+        }
+
+        printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n",
+               port->dev ? dev_name(port->dev) : "",
+               port->dev ? ": " : "",
+               drv->dev_name,
+               drv->tty_driver->name_base + port->line,
+               address, port->irq, uart_type(port));
+}
+
+static void
+uart_configure_port(struct uart_driver *drv, struct uart_state *state,
+                    struct uart_port *port)
+{
+        unsigned int flags;
+
+        /*
+         * If there isn't a port here, don't do anything further.
+         */
+        if (!port->iobase && !port->mapbase && !port->membase)
+                return;
+
+        /*
+         * Now do the auto configuration stuff.  Note that config_port
+         * is expected to claim the resources and map the port for us.
+         */
+        flags = 0;
+        if (port->flags & UPF_AUTO_IRQ)
+                flags |= UART_CONFIG_IRQ;
+        if (port->flags & UPF_BOOT_AUTOCONF) {
+                if (!(port->flags & UPF_FIXED_TYPE)) {
+                        port->type = PORT_UNKNOWN;
+                        flags |= UART_CONFIG_TYPE;
+                }
+                port->ops->config_port(port, flags);
+        }
+
+        if (port->type != PORT_UNKNOWN) {
+                unsigned long flags;
+
+                uart_report_port(drv, port);
+
+                /* Power up port for set_mctrl() */
+                uart_change_pm(state, 0);
+
+                /*
+                 * Ensure that the modem control lines are de-activated.
+                 * keep the DTR setting that is set in uart_set_options()
+                 * We probably don't need a spinlock around this, but
+                 */
+                spin_lock_irqsave(&port->lock, flags);
+                port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR);
+                spin_unlock_irqrestore(&port->lock, flags);
+
+                /*
+                 * If this driver supports console, and it hasn't been
+                 * successfully registered yet, try to re-register it.
+                 * It may be that the port was not available.
+                 */
+                if (port->cons && !(port->cons->flags & CON_ENABLED))
+                        register_console(port->cons);
+
+                /*
+                 * Power down all ports by default, except the
+                 * console if we have one.
+                 */
+                if (!uart_console(port))
+                        uart_change_pm(state, 3);
+        }
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+
+static int uart_poll_init(struct tty_driver *driver, int line, char *options)
+{
+        struct uart_driver *drv = driver->driver_state;
+        struct uart_state *state = drv->state + line;
+        struct uart_port *port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (!state || !state->uart_port)
+                return -1;
+
+        port = state->uart_port;
+        if (!(port->ops->poll_get_char && port->ops->poll_put_char))
+                return -1;
+
+        if (options) {
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+                return uart_set_options(port, NULL, baud, parity, bits, flow);
+        }
+
+        return 0;
+}
+
+static int uart_poll_get_char(struct tty_driver *driver, int line)
+{
+        struct uart_driver *drv = driver->driver_state;
+        struct uart_state *state = drv->state + line;
+        struct uart_port *port;
+
+        if (!state || !state->uart_port)
+                return -1;
+
+        port = state->uart_port;
+        return port->ops->poll_get_char(port);
+}
+
+static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
+{
+        struct uart_driver *drv = driver->driver_state;
+        struct uart_state *state = drv->state + line;
+        struct uart_port *port;
+
+        if (!state || !state->uart_port)
+                return;
+
+        port = state->uart_port;
+        port->ops->poll_put_char(port, ch);
+}
+#endif
+
+static const struct tty_operations uart_ops = {
+        .open           = uart_open,
+        .close          = uart_close,
+        .write          = uart_write,
+        .put_char       = uart_put_char,
+        .flush_chars    = uart_flush_chars,
+        .write_room     = uart_write_room,
+        .chars_in_buffer= uart_chars_in_buffer,
+        .flush_buffer   = uart_flush_buffer,
+        .ioctl          = uart_ioctl,
+        .throttle       = uart_throttle,
+        .unthrottle     = uart_unthrottle,
+        .send_xchar     = uart_send_xchar,
+        .set_termios    = uart_set_termios,
+        .set_ldisc      = uart_set_ldisc,
+        .stop           = uart_stop,
+        .start          = uart_start,
+        .hangup         = uart_hangup,
+        .break_ctl      = uart_break_ctl,
+        .wait_until_sent= uart_wait_until_sent,
+#ifdef CONFIG_PROC_FS
+        .proc_fops      = &uart_proc_fops,
+#endif
+        .tiocmget       = uart_tiocmget,
+        .tiocmset       = uart_tiocmset,
+        .get_icount     = uart_get_icount,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_init      = uart_poll_init,
+        .poll_get_char  = uart_poll_get_char,
+        .poll_put_char  = uart_poll_put_char,
+#endif
+};
+
+static const struct tty_port_operations uart_port_ops = {
+        .carrier_raised = uart_carrier_raised,
+        .dtr_rts        = uart_dtr_rts,
+};
+
+/**
+ *      uart_register_driver - register a driver with the uart core layer
+ *      @drv: low level driver structure
+ *
+ *      Register a uart driver with the core driver.  We in turn register
+ *      with the tty layer, and initialise the core driver per-port state.
+ *
+ *      We have a proc file in /proc/tty/driver which is named after the
+ *      normal driver.
+ *
+ *      drv->port should be NULL, and the per-port structures should be
+ *      registered using uart_add_one_port after this call has succeeded.
+ */
+int uart_register_driver(struct uart_driver *drv)
+{
+        struct tty_driver *normal;
+        int i, retval;
+
+        BUG_ON(drv->state);
+
+        /*
+         * Maybe we should be using a slab cache for this, especially if
+         * we have a large number of ports to handle.
+         */
+        drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL);
+        if (!drv->state)
+                goto out;
+
+        normal = alloc_tty_driver(drv->nr);
+        if (!normal)
+                goto out_kfree;
+
+        drv->tty_driver = normal;
+
+        normal->owner           = drv->owner;
+        normal->driver_name     = drv->driver_name;
+        normal->name            = drv->dev_name;
+        normal->major           = drv->major;
+        normal->minor_start     = drv->minor;
+        normal->type            = TTY_DRIVER_TYPE_SERIAL;
+        normal->subtype         = SERIAL_TYPE_NORMAL;
+        normal->init_termios    = tty_std_termios;
+        normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600;
+        normal->flags           = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        normal->driver_state    = drv;
+        tty_set_operations(normal, &uart_ops);
+
+        /*
+         * Initialise the UART state(s).
+         */
+        for (i = 0; i < drv->nr; i++) {
+                struct uart_state *state = drv->state + i;
+                struct tty_port *port = &state->port;
+
+                tty_port_init(port);
+                port->ops = &uart_port_ops;
+                port->close_delay     = 500;    /* .5 seconds */
+                port->closing_wait    = 30000;  /* 30 seconds */
+                tasklet_init(&state->tlet, uart_tasklet_action,
+                             (unsigned long)state);
+        }
+
+        retval = tty_register_driver(normal);
+        if (retval >= 0)
+                return retval;
+
+        put_tty_driver(normal);
+out_kfree:
+        kfree(drv->state);
+out:
+        return -ENOMEM;
+}
+
+/**
+ *      uart_unregister_driver - remove a driver from the uart core layer
+ *      @drv: low level driver structure
+ *
+ *      Remove all references to a driver from the core driver.  The low
+ *      level driver must have removed all its ports via the
+ *      uart_remove_one_port() if it registered them with uart_add_one_port().
+ *      (ie, drv->port == NULL)
+ */
+void uart_unregister_driver(struct uart_driver *drv)
+{
+        struct tty_driver *p = drv->tty_driver;
+        tty_unregister_driver(p);
+        put_tty_driver(p);
+        kfree(drv->state);
+        drv->tty_driver = NULL;
+}
+
+struct tty_driver *uart_console_device(struct console *co, int *index)
+{
+        struct uart_driver *p = co->data;
+        *index = co->index;
+        return p->tty_driver;
+}
+
+/**
+ *      uart_add_one_port - attach a driver-defined port structure
+ *      @drv: pointer to the uart low level driver structure for this port
+ *      @uport: uart port structure to use for this port.
+ *
+ *      This allows the driver to register its own uart_port structure
+ *      with the core driver.  The main purpose is to allow the low
+ *      level uart drivers to expand uart_port, rather than having yet
+ *      more levels of structures.
+ */
+int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
+{
+        struct uart_state *state;
+        struct tty_port *port;
+        int ret = 0;
+        struct device *tty_dev;
+
+        BUG_ON(in_interrupt());
+
+        if (uport->line >= drv->nr)
+                return -EINVAL;
+
+        state = drv->state + uport->line;
+        port = &state->port;
+
+        mutex_lock(&port_mutex);
+        mutex_lock(&port->mutex);
+        if (state->uart_port) {
+                ret = -EINVAL;
+                goto out;
+        }
+
+        state->uart_port = uport;
+        state->pm_state = -1;
+
+        uport->cons = drv->cons;
+        uport->state = state;
+
+        /*
+         * If this port is a console, then the spinlock is already
+         * initialised.
+         */
+        if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) {
+                spin_lock_init(&uport->lock);
+                lockdep_set_class(&uport->lock, &port_lock_key);
+        }
+
+        uart_configure_port(drv, state, uport);
+
+        /*
+         * Register the port whether it's detected or not.  This allows
+         * setserial to be used to alter this ports parameters.
+         */
+        tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev);
+        if (likely(!IS_ERR(tty_dev))) {
+                device_init_wakeup(tty_dev, 1);
+                device_set_wakeup_enable(tty_dev, 0);
+        } else
+                printk(KERN_ERR "Cannot register tty device on line %d\n",
+                       uport->line);
+
+        /*
+         * Ensure UPF_DEAD is not set.
+         */
+        uport->flags &= ~UPF_DEAD;
+
+ out:
+        mutex_unlock(&port->mutex);
+        mutex_unlock(&port_mutex);
+
+        return ret;
+}
+
+/**
+ *      uart_remove_one_port - detach a driver defined port structure
+ *      @drv: pointer to the uart low level driver structure for this port
+ *      @uport: uart port structure for this port
+ *
+ *      This unhooks (and hangs up) the specified port structure from the
+ *      core driver.  No further calls will be made to the low-level code
+ *      for this port.
+ */
+int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
+{
+        struct uart_state *state = drv->state + uport->line;
+        struct tty_port *port = &state->port;
+
+        BUG_ON(in_interrupt());
+
+        if (state->uart_port != uport)
+                printk(KERN_ALERT "Removing wrong port: %p != %p\n",
+                        state->uart_port, uport);
+
+        mutex_lock(&port_mutex);
+
+        /*
+         * Mark the port "dead" - this prevents any opens from
+         * succeeding while we shut down the port.
+         */
+        mutex_lock(&port->mutex);
+        uport->flags |= UPF_DEAD;
+        mutex_unlock(&port->mutex);
+
+        /*
+         * Remove the devices from the tty layer
+         */
+        tty_unregister_device(drv->tty_driver, uport->line);
+
+        if (port->tty)
+                tty_vhangup(port->tty);
+
+        /*
+         * Free the port IO and memory resources, if any.
+         */
+        if (uport->type != PORT_UNKNOWN)
+                uport->ops->release_port(uport);
+
+        /*
+         * Indicate that there isn't a port here anymore.
+         */
+        uport->type = PORT_UNKNOWN;
+
+        /*
+         * Kill the tasklet, and free resources.
+         */
+        tasklet_kill(&state->tlet);
+
+        state->uart_port = NULL;
+        mutex_unlock(&port_mutex);
+
+        return 0;
+}
+
+/*
+ *      Are the two ports equivalent?
+ */
+int uart_match_port(struct uart_port *port1, struct uart_port *port2)
+{
+        if (port1->iotype != port2->iotype)
+                return 0;
+
+        switch (port1->iotype) {
+        case UPIO_PORT:
+                return (port1->iobase == port2->iobase);
+        case UPIO_HUB6:
+                return (port1->iobase == port2->iobase) &&
+                       (port1->hub6   == port2->hub6);
+        case UPIO_MEM:
+        case UPIO_MEM32:
+        case UPIO_AU:
+        case UPIO_TSI:
+        case UPIO_DWAPB:
+        case UPIO_DWAPB32:
+                return (port1->mapbase == port2->mapbase);
+        }
+        return 0;
+}
+EXPORT_SYMBOL(uart_match_port);
+
+EXPORT_SYMBOL(uart_write_wakeup);
+EXPORT_SYMBOL(uart_register_driver);
+EXPORT_SYMBOL(uart_unregister_driver);
+EXPORT_SYMBOL(uart_suspend_port);
+EXPORT_SYMBOL(uart_resume_port);
+EXPORT_SYMBOL(uart_add_one_port);
+EXPORT_SYMBOL(uart_remove_one_port);
+
+MODULE_DESCRIPTION("Serial driver core");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/serial_cs.c b/drivers/tty/serial/serial_cs.c
new file mode 100644
index 000000000000..eef736ff810a
--- /dev/null
+++ b/drivers/tty/serial/serial_cs.c
@@ -0,0 +1,870 @@
+/*======================================================================
+
+    A driver for PCMCIA serial devices
+
+    serial_cs.c 1.134 2002/05/04 05:48:53
+
+    The contents of this file are subject to the Mozilla Public
+    License Version 1.1 (the "License"); you may not use this file
+    except in compliance with the License. You may obtain a copy of
+    the License at http://www.mozilla.org/MPL/
+
+    Software distributed under the License is distributed on an "AS
+    IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+    implied. See the License for the specific language governing
+    rights and limitations under the License.
+
+    The initial developer of the original code is David A. Hinds
+    <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
+    are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
+
+    Alternatively, the contents of this file may be used under the
+    terms of the GNU General Public License version 2 (the "GPL"), in which
+    case the provisions of the GPL are applicable instead of the
+    above.  If you wish to allow the use of your version of this file
+    only under the terms of the GPL and not to allow others to use
+    your version of this file under the MPL, indicate your decision
+    by deleting the provisions above and replace them with the notice
+    and other provisions required by the GPL.  If you do not delete
+    the provisions above, a recipient may use your version of this
+    file under either the MPL or the GPL.
+    
+======================================================================*/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/serial_core.h>
+#include <linux/delay.h>
+#include <linux/major.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ciscode.h>
+#include <pcmcia/ds.h>
+#include <pcmcia/cisreg.h>
+
+#include "8250.h"
+
+
+/*====================================================================*/
+
+/* Parameters that can be set with 'insmod' */
+
+/* Enable the speaker? */
+static int do_sound = 1;
+/* Skip strict UART tests? */
+static int buggy_uart;
+
+module_param(do_sound, int, 0444);
+module_param(buggy_uart, int, 0444);
+
+/*====================================================================*/
+
+/* Table of multi-port card ID's */
+
+struct serial_quirk {
+        unsigned int manfid;
+        unsigned int prodid;
+        int multi;              /* 1 = multifunction, > 1 = # ports */
+        void (*config)(struct pcmcia_device *);
+        void (*setup)(struct pcmcia_device *, struct uart_port *);
+        void (*wakeup)(struct pcmcia_device *);
+        int (*post)(struct pcmcia_device *);
+};
+
+struct serial_info {
+        struct pcmcia_device    *p_dev;
+        int                     ndev;
+        int                     multi;
+        int                     slave;
+        int                     manfid;
+        int                     prodid;
+        int                     c950ctrl;
+        int                     line[4];
+        const struct serial_quirk *quirk;
+};
+
+struct serial_cfg_mem {
+        tuple_t tuple;
+        cisparse_t parse;
+        u_char buf[256];
+};
+
+/*
+ * vers_1 5.0, "Brain Boxes", "2-Port RS232 card", "r6"
+ * manfid 0x0160, 0x0104
+ * This card appears to have a 14.7456MHz clock.
+ */
+/* Generic Modem: MD55x (GPRS/EDGE) have
+ * Elan VPU16551 UART with 14.7456MHz oscillator
+ * manfid 0x015D, 0x4C45
+ */
+static void quirk_setup_brainboxes_0104(struct pcmcia_device *link, struct uart_port *port)
+{
+        port->uartclk = 14745600;
+}
+
+static int quirk_post_ibm(struct pcmcia_device *link)
+{
+        u8 val;
+        int ret;
+
+        ret = pcmcia_read_config_byte(link, 0x800, &val);
+        if (ret)
+                goto failed;
+
+        ret = pcmcia_write_config_byte(link, 0x800, val | 1);
+        if (ret)
+                goto failed;
+        return 0;
+
+ failed:
+        return -ENODEV;
+}
+
+/*
+ * Nokia cards are not really multiport cards.  Shouldn't this
+ * be handled by setting the quirk entry .multi = 0 | 1 ?
+ */
+static void quirk_config_nokia(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+
+        if (info->multi > 1)
+                info->multi = 1;
+}
+
+static void quirk_wakeup_oxsemi(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+
+        if (info->c950ctrl)
+                outb(12, info->c950ctrl + 1);
+}
+
+/* request_region? oxsemi branch does no request_region too... */
+/*
+ * This sequence is needed to properly initialize MC45 attached to OXCF950.
+ * I tried decreasing these msleep()s, but it worked properly (survived
+ * 1000 stop/start operations) with these timeouts (or bigger).
+ */
+static void quirk_wakeup_possio_gcc(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+        unsigned int ctrl = info->c950ctrl;
+
+        outb(0xA, ctrl + 1);
+        msleep(100);
+        outb(0xE, ctrl + 1);
+        msleep(300);
+        outb(0xC, ctrl + 1);
+        msleep(100);
+        outb(0xE, ctrl + 1);
+        msleep(200);
+        outb(0xF, ctrl + 1);
+        msleep(100);
+        outb(0xE, ctrl + 1);
+        msleep(100);
+        outb(0xC, ctrl + 1);
+}
+
+/*
+ * Socket Dual IO: this enables irq's for second port
+ */
+static void quirk_config_socket(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+
+        if (info->multi)
+                link->config_flags |= CONF_ENABLE_ESR;
+}
+
+static const struct serial_quirk quirks[] = {
+        {
+                .manfid = 0x0160,
+                .prodid = 0x0104,
+                .multi  = -1,
+                .setup  = quirk_setup_brainboxes_0104,
+        }, {
+                .manfid = 0x015D,
+                .prodid = 0x4C45,
+                .multi  = -1,
+                .setup  = quirk_setup_brainboxes_0104,
+        }, {
+                .manfid = MANFID_IBM,
+                .prodid = ~0,
+                .multi  = -1,
+                .post   = quirk_post_ibm,
+        }, {
+                .manfid = MANFID_INTEL,
+                .prodid = PRODID_INTEL_DUAL_RS232,
+                .multi  = 2,
+        }, {
+                .manfid = MANFID_NATINST,
+                .prodid = PRODID_NATINST_QUAD_RS232,
+                .multi  = 4,
+        }, {
+                .manfid = MANFID_NOKIA,
+                .prodid = ~0,
+                .multi  = -1,
+                .config = quirk_config_nokia,
+        }, {
+                .manfid = MANFID_OMEGA,
+                .prodid = PRODID_OMEGA_QSP_100,
+                .multi  = 4,
+        }, {
+                .manfid = MANFID_OXSEMI,
+                .prodid = ~0,
+                .multi  = -1,
+                .wakeup = quirk_wakeup_oxsemi,
+        }, {
+                .manfid = MANFID_POSSIO,
+                .prodid = PRODID_POSSIO_GCC,
+                .multi  = -1,
+                .wakeup = quirk_wakeup_possio_gcc,
+        }, {
+                .manfid = MANFID_QUATECH,
+                .prodid = PRODID_QUATECH_DUAL_RS232,
+                .multi  = 2,
+        }, {
+                .manfid = MANFID_QUATECH,
+                .prodid = PRODID_QUATECH_DUAL_RS232_D1,
+                .multi  = 2,
+        }, {
+                .manfid = MANFID_QUATECH,
+                .prodid = PRODID_QUATECH_DUAL_RS232_G,
+                .multi  = 2,
+        }, {
+                .manfid = MANFID_QUATECH,
+                .prodid = PRODID_QUATECH_QUAD_RS232,
+                .multi  = 4,
+        }, {
+                .manfid = MANFID_SOCKET,
+                .prodid = PRODID_SOCKET_DUAL_RS232,
+                .multi  = 2,
+                .config = quirk_config_socket,
+        }, {
+                .manfid = MANFID_SOCKET,
+                .prodid = ~0,
+                .multi  = -1,
+                .config = quirk_config_socket,
+        }
+};
+
+
+static int serial_config(struct pcmcia_device * link);
+
+
+static void serial_remove(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+        int i;
+
+        dev_dbg(&link->dev, "serial_release\n");
+
+        /*
+         * Recheck to see if the device is still configured.
+         */
+        for (i = 0; i < info->ndev; i++)
+                serial8250_unregister_port(info->line[i]);
+
+        if (!info->slave)
+                pcmcia_disable_device(link);
+}
+
+static int serial_suspend(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+        int i;
+
+        for (i = 0; i < info->ndev; i++)
+                serial8250_suspend_port(info->line[i]);
+
+        return 0;
+}
+
+static int serial_resume(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+        int i;
+
+        for (i = 0; i < info->ndev; i++)
+                serial8250_resume_port(info->line[i]);
+
+        if (info->quirk && info->quirk->wakeup)
+                info->quirk->wakeup(link);
+
+        return 0;
+}
+
+static int serial_probe(struct pcmcia_device *link)
+{
+        struct serial_info *info;
+
+        dev_dbg(&link->dev, "serial_attach()\n");
+
+        /* Create new serial device */
+        info = kzalloc(sizeof (*info), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+        info->p_dev = link;
+        link->priv = info;
+
+        link->config_flags |= CONF_ENABLE_IRQ;
+        if (do_sound)
+                link->config_flags |= CONF_ENABLE_SPKR;
+
+        return serial_config(link);
+}
+
+static void serial_detach(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+
+        dev_dbg(&link->dev, "serial_detach\n");
+
+        /*
+         * Ensure that the ports have been released.
+         */
+        serial_remove(link);
+
+        /* free bits */
+        kfree(info);
+}
+
+/*====================================================================*/
+
+static int setup_serial(struct pcmcia_device *handle, struct serial_info * info,
+                        unsigned int iobase, int irq)
+{
+        struct uart_port port;
+        int line;
+
+        memset(&port, 0, sizeof (struct uart_port));
+        port.iobase = iobase;
+        port.irq = irq;
+        port.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
+        port.uartclk = 1843200;
+        port.dev = &handle->dev;
+        if (buggy_uart)
+                port.flags |= UPF_BUGGY_UART;
+
+        if (info->quirk && info->quirk->setup)
+                info->quirk->setup(handle, &port);
+
+        line = serial8250_register_port(&port);
+        if (line < 0) {
+                printk(KERN_NOTICE "serial_cs: serial8250_register_port() at "
+                       "0x%04lx, irq %d failed\n", (u_long)iobase, irq);
+                return -EINVAL;
+        }
+
+        info->line[info->ndev] = line;
+        info->ndev++;
+
+        return 0;
+}
+
+/*====================================================================*/
+
+static int pfc_config(struct pcmcia_device *p_dev)
+{
+        unsigned int port = 0;
+        struct serial_info *info = p_dev->priv;
+
+        if ((p_dev->resource[1]->end != 0) &&
+                (resource_size(p_dev->resource[1]) == 8)) {
+                port = p_dev->resource[1]->start;
+                info->slave = 1;
+        } else if ((info->manfid == MANFID_OSITECH) &&
+                (resource_size(p_dev->resource[0]) == 0x40)) {
+                port = p_dev->resource[0]->start + 0x28;
+                info->slave = 1;
+        }
+        if (info->slave)
+                return setup_serial(p_dev, info, port, p_dev->irq);
+
+        dev_warn(&p_dev->dev, "no usable port range found, giving up\n");
+        return -ENODEV;
+}
+
+static int simple_config_check(struct pcmcia_device *p_dev, void *priv_data)
+{
+        static const int size_table[2] = { 8, 16 };
+        int *try = priv_data;
+
+        if (p_dev->resource[0]->start == 0)
+                return -ENODEV;
+
+        if ((*try & 0x1) == 0)
+                p_dev->io_lines = 16;
+
+        if (p_dev->resource[0]->end != size_table[(*try >> 1)])
+                return -ENODEV;
+
+        p_dev->resource[0]->end = 8;
+        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
+        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
+
+        return pcmcia_request_io(p_dev);
+}
+
+static int simple_config_check_notpicky(struct pcmcia_device *p_dev,
+                                        void *priv_data)
+{
+        static const unsigned int base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
+        int j;
+
+        if (p_dev->io_lines > 3)
+                return -ENODEV;
+
+        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
+        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
+        p_dev->resource[0]->end = 8;
+
+        for (j = 0; j < 5; j++) {
+                p_dev->resource[0]->start = base[j];
+                p_dev->io_lines = base[j] ? 16 : 3;
+                if (!pcmcia_request_io(p_dev))
+                        return 0;
+        }
+        return -ENODEV;
+}
+
+static int simple_config(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+        int i = -ENODEV, try;
+
+        /* First pass: look for a config entry that looks normal.
+         * Two tries: without IO aliases, then with aliases */
+        link->config_flags |= CONF_AUTO_SET_VPP | CONF_AUTO_SET_IO;
+        for (try = 0; try < 4; try++)
+                if (!pcmcia_loop_config(link, simple_config_check, &try))
+                        goto found_port;
+
+        /* Second pass: try to find an entry that isn't picky about
+           its base address, then try to grab any standard serial port
+           address, and finally try to get any free port. */
+        if (!pcmcia_loop_config(link, simple_config_check_notpicky, NULL))
+                goto found_port;
+
+        dev_warn(&link->dev, "no usable port range found, giving up\n");
+        return -1;
+
+found_port:
+        if (info->multi && (info->manfid == MANFID_3COM))
+                link->config_index &= ~(0x08);
+
+        /*
+         * Apply any configuration quirks.
+         */
+        if (info->quirk && info->quirk->config)
+                info->quirk->config(link);
+
+        i = pcmcia_enable_device(link);
+        if (i != 0)
+                return -1;
+        return setup_serial(link, info, link->resource[0]->start, link->irq);
+}
+
+static int multi_config_check(struct pcmcia_device *p_dev, void *priv_data)
+{
+        int *multi = priv_data;
+
+        if (p_dev->resource[1]->end)
+                return -EINVAL;
+
+        /* The quad port cards have bad CIS's, so just look for a
+           window larger than 8 ports and assume it will be right */
+        if (p_dev->resource[0]->end <= 8)
+                return -EINVAL;
+
+        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
+        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
+        p_dev->resource[0]->end = *multi * 8;
+
+        if (pcmcia_request_io(p_dev))
+                return -ENODEV;
+        return 0;
+}
+
+static int multi_config_check_notpicky(struct pcmcia_device *p_dev,
+                                       void *priv_data)
+{
+        int *base2 = priv_data;
+
+        if (!p_dev->resource[0]->end || !p_dev->resource[1]->end)
+                return -ENODEV;
+
+        p_dev->resource[0]->end = p_dev->resource[1]->end = 8;
+        p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
+        p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
+
+        if (pcmcia_request_io(p_dev))
+                return -ENODEV;
+
+        *base2 = p_dev->resource[0]->start + 8;
+        return 0;
+}
+
+static int multi_config(struct pcmcia_device *link)
+{
+        struct serial_info *info = link->priv;
+        int i, base2 = 0;
+
+        link->config_flags |= CONF_AUTO_SET_IO;
+        /* First, look for a generic full-sized window */
+        if (!pcmcia_loop_config(link, multi_config_check, &info->multi))
+                base2 = link->resource[0]->start + 8;
+        else {
+                /* If that didn't work, look for two windows */
+                info->multi = 2;
+                if (pcmcia_loop_config(link, multi_config_check_notpicky,
+                                       &base2)) {
+                        dev_warn(&link->dev, "no usable port range "
+                               "found, giving up\n");
+                        return -ENODEV;
+                }
+        }
+
+        if (!link->irq)
+                dev_warn(&link->dev, "no usable IRQ found, continuing...\n");
+
+        /*
+         * Apply any configuration quirks.
+         */
+        if (info->quirk && info->quirk->config)
+                info->quirk->config(link);
+
+        i = pcmcia_enable_device(link);
+        if (i != 0)
+                return -ENODEV;
+
+        /* The Oxford Semiconductor OXCF950 cards are in fact single-port:
+         * 8 registers are for the UART, the others are extra registers.
+         * Siemen's MC45 PCMCIA (Possio's GCC) is OXCF950 based too.
+         */
+        if (info->manfid == MANFID_OXSEMI || (info->manfid == MANFID_POSSIO &&
+                                info->prodid == PRODID_POSSIO_GCC)) {
+                int err;
+
+                if (link->config_index == 1 ||
+                    link->config_index == 3) {
+                        err = setup_serial(link, info, base2,
+                                        link->irq);
+                        base2 = link->resource[0]->start;
+                } else {
+                        err = setup_serial(link, info, link->resource[0]->start,
+                                        link->irq);
+                }
+                info->c950ctrl = base2;
+
+                /*
+                 * FIXME: We really should wake up the port prior to
+                 * handing it over to the serial layer.
+                 */
+                if (info->quirk && info->quirk->wakeup)
+                        info->quirk->wakeup(link);
+
+                return 0;
+        }
+
+        setup_serial(link, info, link->resource[0]->start, link->irq);
+        for (i = 0; i < info->multi - 1; i++)
+                setup_serial(link, info, base2 + (8 * i),
+                                link->irq);
+        return 0;
+}
+
+static int serial_check_for_multi(struct pcmcia_device *p_dev,  void *priv_data)
+{
+        struct serial_info *info = p_dev->priv;
+
+        if (!p_dev->resource[0]->end)
+                return -EINVAL;
+
+        if ((!p_dev->resource[1]->end) && (p_dev->resource[0]->end % 8 == 0))
+                info->multi = p_dev->resource[0]->end >> 3;
+
+        if ((p_dev->resource[1]->end) && (p_dev->resource[0]->end == 8)
+                && (p_dev->resource[1]->end == 8))
+                info->multi = 2;
+
+        return 0; /* break */
+}
+
+
+static int serial_config(struct pcmcia_device * link)
+{
+        struct serial_info *info = link->priv;
+        int i;
+
+        dev_dbg(&link->dev, "serial_config\n");
+
+        /* Is this a compliant multifunction card? */
+        info->multi = (link->socket->functions > 1);
+
+        /* Is this a multiport card? */
+        info->manfid = link->manf_id;
+        info->prodid = link->card_id;
+
+        for (i = 0; i < ARRAY_SIZE(quirks); i++)
+                if ((quirks[i].manfid == ~0 ||
+                     quirks[i].manfid == info->manfid) &&
+                    (quirks[i].prodid == ~0 ||
+                     quirks[i].prodid == info->prodid)) {
+                        info->quirk = &quirks[i];
+                        break;
+                }
+
+        /* Another check for dual-serial cards: look for either serial or
+           multifunction cards that ask for appropriate IO port ranges */
+        if ((info->multi == 0) &&
+            (link->has_func_id) &&
+            (link->socket->pcmcia_pfc == 0) &&
+            ((link->func_id == CISTPL_FUNCID_MULTI) ||
+             (link->func_id == CISTPL_FUNCID_SERIAL)))
+                pcmcia_loop_config(link, serial_check_for_multi, info);
+
+        /*
+         * Apply any multi-port quirk.
+         */
+        if (info->quirk && info->quirk->multi != -1)
+                info->multi = info->quirk->multi;
+
+        dev_info(&link->dev,
+                "trying to set up [0x%04x:0x%04x] (pfc: %d, multi: %d, quirk: %p)\n",
+                link->manf_id, link->card_id,
+                link->socket->pcmcia_pfc, info->multi, info->quirk);
+        if (link->socket->pcmcia_pfc)
+                i = pfc_config(link);
+        else if (info->multi > 1)
+                i = multi_config(link);
+        else
+                i = simple_config(link);
+
+        if (i || info->ndev == 0)
+                goto failed;
+
+        /*
+         * Apply any post-init quirk.  FIXME: This should really happen
+         * before we register the port, since it might already be in use.
+         */
+        if (info->quirk && info->quirk->post)
+                if (info->quirk->post(link))
+                        goto failed;
+
+        return 0;
+
+failed:
+        dev_warn(&link->dev, "failed to initialize\n");
+        serial_remove(link);
+        return -ENODEV;
+}
+
+static const struct pcmcia_device_id serial_ids[] = {
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0057, 0x0021),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0089, 0x110a),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0104, 0x000a),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0105, 0x0d0a),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0105, 0x0e0a),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0105, 0xea15),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0109, 0x0501),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0138, 0x110a),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0140, 0x000a),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0143, 0x3341),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0143, 0xc0ab),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x016c, 0x0081),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x021b, 0x0101),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x08a1, 0xc0ab),
+        PCMCIA_PFC_DEVICE_PROD_ID123(1, "MEGAHERTZ", "CC/XJEM3288", "DATA/FAX/CELL ETHERNET MODEM", 0xf510db04, 0x04cd2988, 0x46a52d63),
+        PCMCIA_PFC_DEVICE_PROD_ID123(1, "MEGAHERTZ", "CC/XJEM3336", "DATA/FAX/CELL ETHERNET MODEM", 0xf510db04, 0x0143b773, 0x46a52d63),
+        PCMCIA_PFC_DEVICE_PROD_ID123(1, "MEGAHERTZ", "EM1144T", "PCMCIA MODEM", 0xf510db04, 0x856d66c8, 0xbd6c43ef),
+        PCMCIA_PFC_DEVICE_PROD_ID123(1, "MEGAHERTZ", "XJEM1144/CCEM1144", "PCMCIA MODEM", 0xf510db04, 0x52d21e1e, 0xbd6c43ef),
+        PCMCIA_PFC_DEVICE_PROD_ID13(1, "Xircom", "CEM28", 0x2e3ee845, 0x0ea978ea),
+        PCMCIA_PFC_DEVICE_PROD_ID13(1, "Xircom", "CEM33", 0x2e3ee845, 0x80609023),
+        PCMCIA_PFC_DEVICE_PROD_ID13(1, "Xircom", "CEM56", 0x2e3ee845, 0xa650c32a),
+        PCMCIA_PFC_DEVICE_PROD_ID13(1, "Xircom", "REM10", 0x2e3ee845, 0x76df1d29),
+        PCMCIA_PFC_DEVICE_PROD_ID13(1, "Xircom", "XEM5600", 0x2e3ee845, 0xf1403719),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "AnyCom", "Fast Ethernet + 56K COMBO", 0x578ba6e7, 0xb0ac62c4),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "ATKK", "LM33-PCM-T", 0xba9eb7e2, 0x077c174e),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "D-Link", "DME336T", 0x1a424a1c, 0xb23897ff),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "Gateway 2000", "XJEM3336", 0xdd9989be, 0x662c394c),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "Grey Cell", "GCS3000", 0x2a151fac, 0x48b932ae),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "Linksys", "EtherFast 10&100 + 56K PC Card (PCMLM56)", 0x0733cc81, 0xb3765033),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "LINKSYS", "PCMLM336", 0xf7cb0b07, 0x7a821b58),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "MEGAHERTZ", "XJEM1144/CCEM1144", 0xf510db04, 0x52d21e1e),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "MICRO RESEARCH", "COMBO-L/M-336", 0xb2ced065, 0x3ced0555),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "NEC", "PK-UG-J001" ,0x18df0ba0 ,0x831b1064),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "Ositech", "Trumpcard:Jack of Diamonds Modem+Ethernet", 0xc2f80cd, 0x656947b9),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "Ositech", "Trumpcard:Jack of Hearts Modem+Ethernet", 0xc2f80cd, 0xdc9ba5ed),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "PCMCIAs", "ComboCard", 0xdcfe12d3, 0xcd8906cc),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "PCMCIAs", "LanModem", 0xdcfe12d3, 0xc67c648f),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "TDK", "GlobalNetworker 3410/3412", 0x1eae9475, 0xd9a93bed),
+        PCMCIA_PFC_DEVICE_PROD_ID12(1, "Xircom", "CreditCard Ethernet+Modem II", 0x2e3ee845, 0xeca401bf),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0032, 0x0e01),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0032, 0x0a05),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0032, 0x0b05),
+        PCMCIA_PFC_DEVICE_MANF_CARD(1, 0x0032, 0x1101),
+        PCMCIA_MFC_DEVICE_MANF_CARD(0, 0x0104, 0x0070),
+        PCMCIA_MFC_DEVICE_MANF_CARD(1, 0x0101, 0x0562),
+        PCMCIA_MFC_DEVICE_MANF_CARD(1, 0x0104, 0x0070),
+        PCMCIA_MFC_DEVICE_MANF_CARD(1, 0x016c, 0x0020),
+        PCMCIA_MFC_DEVICE_PROD_ID123(1, "APEX DATA", "MULTICARD", "ETHERNET-MODEM", 0x11c2da09, 0x7289dc5d, 0xaad95e1f),
+        PCMCIA_MFC_DEVICE_PROD_ID12(1, "IBM", "Home and Away 28.8 PC Card       ", 0xb569a6e5, 0x5bd4ff2c),
+        PCMCIA_MFC_DEVICE_PROD_ID12(1, "IBM", "Home and Away Credit Card Adapter", 0xb569a6e5, 0x4bdf15c3),
+        PCMCIA_MFC_DEVICE_PROD_ID12(1, "IBM", "w95 Home and Away Credit Card ", 0xb569a6e5, 0xae911c15),
+        PCMCIA_MFC_DEVICE_PROD_ID1(1, "Motorola MARQUIS", 0xf03e4e77),
+        PCMCIA_MFC_DEVICE_PROD_ID2(1, "FAX/Modem/Ethernet Combo Card ", 0x1ed59302),
+        PCMCIA_DEVICE_MANF_CARD(0x0089, 0x0301),
+        PCMCIA_DEVICE_MANF_CARD(0x00a4, 0x0276),
+        PCMCIA_DEVICE_MANF_CARD(0x0101, 0x0039),
+        PCMCIA_DEVICE_MANF_CARD(0x0104, 0x0006),
+        PCMCIA_DEVICE_MANF_CARD(0x0105, 0x0101), /* TDK DF2814 */
+        PCMCIA_DEVICE_MANF_CARD(0x0105, 0x100a), /* Xircom CM-56G */
+        PCMCIA_DEVICE_MANF_CARD(0x0105, 0x3e0a), /* TDK DF5660 */
+        PCMCIA_DEVICE_MANF_CARD(0x0105, 0x410a),
+        PCMCIA_DEVICE_MANF_CARD(0x0107, 0x0002), /* USRobotics 14,400 */
+        PCMCIA_DEVICE_MANF_CARD(0x010b, 0x0d50),
+        PCMCIA_DEVICE_MANF_CARD(0x010b, 0x0d51),
+        PCMCIA_DEVICE_MANF_CARD(0x010b, 0x0d52),
+        PCMCIA_DEVICE_MANF_CARD(0x010b, 0x0d53),
+        PCMCIA_DEVICE_MANF_CARD(0x010b, 0xd180),
+        PCMCIA_DEVICE_MANF_CARD(0x0115, 0x3330), /* USRobotics/SUN 14,400 */
+        PCMCIA_DEVICE_MANF_CARD(0x0124, 0x0100), /* Nokia DTP-2 ver II */
+        PCMCIA_DEVICE_MANF_CARD(0x0134, 0x5600), /* LASAT COMMUNICATIONS A/S */
+        PCMCIA_DEVICE_MANF_CARD(0x0137, 0x000e),
+        PCMCIA_DEVICE_MANF_CARD(0x0137, 0x001b),
+        PCMCIA_DEVICE_MANF_CARD(0x0137, 0x0025),
+        PCMCIA_DEVICE_MANF_CARD(0x0137, 0x0045),
+        PCMCIA_DEVICE_MANF_CARD(0x0137, 0x0052),
+        PCMCIA_DEVICE_MANF_CARD(0x016c, 0x0006), /* Psion 56K+Fax */
+        PCMCIA_DEVICE_MANF_CARD(0x0200, 0x0001), /* MultiMobile */
+        PCMCIA_DEVICE_PROD_ID134("ADV", "TECH", "COMpad-32/85", 0x67459937, 0x916d02ba, 0x8fbe92ae),
+        PCMCIA_DEVICE_PROD_ID124("GATEWAY2000", "CC3144", "PCMCIA MODEM", 0x506bccae, 0xcb3685f1, 0xbd6c43ef),
+        PCMCIA_DEVICE_PROD_ID14("MEGAHERTZ", "PCMCIA MODEM", 0xf510db04, 0xbd6c43ef),
+        PCMCIA_DEVICE_PROD_ID124("TOSHIBA", "T144PF", "PCMCIA MODEM", 0xb4585a1a, 0x7271409c, 0xbd6c43ef),
+        PCMCIA_DEVICE_PROD_ID123("FUJITSU", "FC14F ", "MBH10213", 0x6ee5a3d8, 0x30ead12b, 0xb00f05a0),
+        PCMCIA_DEVICE_PROD_ID123("Novatel Wireless", "Merlin UMTS Modem", "U630", 0x32607776, 0xd9e73b13, 0xe87332e),
+        PCMCIA_DEVICE_PROD_ID13("MEGAHERTZ", "V.34 PCMCIA MODEM", 0xf510db04, 0xbb2cce4a),
+        PCMCIA_DEVICE_PROD_ID12("Brain Boxes", "Bluetooth PC Card", 0xee138382, 0xd4ce9b02),
+        PCMCIA_DEVICE_PROD_ID12("CIRRUS LOGIC", "FAX MODEM", 0xe625f451, 0xcecd6dfa),
+        PCMCIA_DEVICE_PROD_ID12("COMPAQ", "PCMCIA 28800 FAX/DATA MODEM", 0xa3a3062c, 0x8cbd7c76),
+        PCMCIA_DEVICE_PROD_ID12("COMPAQ", "PCMCIA 33600 FAX/DATA MODEM", 0xa3a3062c, 0x5a00ce95),
+        PCMCIA_DEVICE_PROD_ID12("Computerboards, Inc.", "PCM-COM422", 0xd0b78f51, 0x7e2d49ed),
+        PCMCIA_DEVICE_PROD_ID12("Dr. Neuhaus", "FURY CARD 14K4", 0x76942813, 0x8b96ce65),
+        PCMCIA_DEVICE_PROD_ID12("IBM", "ISDN/56K/GSM", 0xb569a6e5, 0xfee5297b),
+        PCMCIA_DEVICE_PROD_ID12("Intelligent", "ANGIA FAX/MODEM", 0xb496e65e, 0xf31602a6),
+        PCMCIA_DEVICE_PROD_ID12("Intel", "MODEM 2400+", 0x816cc815, 0x412729fb),
+        PCMCIA_DEVICE_PROD_ID12("Intertex", "IX34-PCMCIA", 0xf8a097e3, 0x97880447),
+        PCMCIA_DEVICE_PROD_ID12("IOTech Inc ", "PCMCIA Dual RS-232 Serial Port Card", 0x3bd2d898, 0x92abc92f),
+        PCMCIA_DEVICE_PROD_ID12("MACRONIX", "FAX/MODEM", 0x668388b3, 0x3f9bdf2f),
+        PCMCIA_DEVICE_PROD_ID12("Multi-Tech", "MT1432LT", 0x5f73be51, 0x0b3e2383),
+        PCMCIA_DEVICE_PROD_ID12("Multi-Tech", "MT2834LT", 0x5f73be51, 0x4cd7c09e),
+        PCMCIA_DEVICE_PROD_ID12("OEM      ", "C288MX     ", 0xb572d360, 0xd2385b7a),
+        PCMCIA_DEVICE_PROD_ID12("Option International", "V34bis GSM/PSTN Data/Fax Modem", 0x9d7cd6f5, 0x5cb8bf41),
+        PCMCIA_DEVICE_PROD_ID12("PCMCIA   ", "C336MX     ", 0x99bcafe9, 0xaa25bcab),
+        PCMCIA_DEVICE_PROD_ID12("Quatech Inc", "PCMCIA Dual RS-232 Serial Port Card", 0xc4420b35, 0x92abc92f),
+        PCMCIA_DEVICE_PROD_ID12("Quatech Inc", "Dual RS-232 Serial Port PC Card", 0xc4420b35, 0x031a380d),
+        PCMCIA_DEVICE_PROD_ID12("Telia", "SurfinBird 560P/A+", 0xe2cdd5e, 0xc9314b38),
+        PCMCIA_DEVICE_PROD_ID1("Smart Serial Port", 0x2d8ce292),
+        PCMCIA_PFC_DEVICE_CIS_PROD_ID12(1, "PCMCIA", "EN2218-LAN/MODEM", 0x281f1c5d, 0x570f348e, "cis/PCMLM28.cis"),
+        PCMCIA_PFC_DEVICE_CIS_PROD_ID12(1, "PCMCIA", "UE2218-LAN/MODEM", 0x281f1c5d, 0x6fdcacee, "cis/PCMLM28.cis"),
+        PCMCIA_PFC_DEVICE_CIS_PROD_ID12(1, "Psion Dacom", "Gold Card V34 Ethernet", 0xf5f025c2, 0x338e8155, "cis/PCMLM28.cis"),
+        PCMCIA_PFC_DEVICE_CIS_PROD_ID12(1, "Psion Dacom", "Gold Card V34 Ethernet GSM", 0xf5f025c2, 0x4ae85d35, "cis/PCMLM28.cis"),
+        PCMCIA_PFC_DEVICE_CIS_PROD_ID12(1, "LINKSYS", "PCMLM28", 0xf7cb0b07, 0x66881874, "cis/PCMLM28.cis"),
+        PCMCIA_PFC_DEVICE_CIS_PROD_ID12(1, "TOSHIBA", "Modem/LAN Card", 0xb4585a1a, 0x53f922f8, "cis/PCMLM28.cis"),
+        PCMCIA_MFC_DEVICE_CIS_PROD_ID12(1, "DAYNA COMMUNICATIONS", "LAN AND MODEM MULTIFUNCTION", 0x8fdf8f89, 0xdd5ed9e8, "cis/DP83903.cis"),
+        PCMCIA_MFC_DEVICE_CIS_PROD_ID4(1, "NSC MF LAN/Modem", 0x58fc6056, "cis/DP83903.cis"),
+        PCMCIA_MFC_DEVICE_CIS_MANF_CARD(1, 0x0101, 0x0556, "cis/3CCFEM556.cis"),
+        PCMCIA_MFC_DEVICE_CIS_MANF_CARD(1, 0x0175, 0x0000, "cis/DP83903.cis"),
+        PCMCIA_MFC_DEVICE_CIS_MANF_CARD(1, 0x0101, 0x0035, "cis/3CXEM556.cis"),
+        PCMCIA_MFC_DEVICE_CIS_MANF_CARD(1, 0x0101, 0x003d, "cis/3CXEM556.cis"),
+        PCMCIA_DEVICE_CIS_PROD_ID12("Sierra Wireless", "AC850", 0xd85f6206, 0x42a2c018, "cis/SW_8xx_SER.cis"), /* Sierra Wireless AC850 3G Network Adapter R1 */
+        PCMCIA_DEVICE_CIS_PROD_ID12("Sierra Wireless", "AC860", 0xd85f6206, 0x698f93db, "cis/SW_8xx_SER.cis"), /* Sierra Wireless AC860 3G Network Adapter R1 */
+        PCMCIA_DEVICE_CIS_PROD_ID12("Sierra Wireless", "AC710/AC750", 0xd85f6206, 0x761b11e0, "cis/SW_7xx_SER.cis"),  /* Sierra Wireless AC710/AC750 GPRS Network Adapter R1 */
+        PCMCIA_DEVICE_CIS_MANF_CARD(0x0192, 0xa555, "cis/SW_555_SER.cis"),  /* Sierra Aircard 555 CDMA 1xrtt Modem -- pre update */
+        PCMCIA_DEVICE_CIS_MANF_CARD(0x013f, 0xa555, "cis/SW_555_SER.cis"),  /* Sierra Aircard 555 CDMA 1xrtt Modem -- post update */
+        PCMCIA_DEVICE_CIS_PROD_ID12("MultiTech", "PCMCIA 56K DataFax", 0x842047ee, 0xc2efcf03, "cis/MT5634ZLX.cis"),
+        PCMCIA_DEVICE_CIS_PROD_ID12("ADVANTECH", "COMpad-32/85B-2", 0x96913a85, 0x27ab5437, "cis/COMpad2.cis"),
+        PCMCIA_DEVICE_CIS_PROD_ID12("ADVANTECH", "COMpad-32/85B-4", 0x96913a85, 0xcec8f102, "cis/COMpad4.cis"),
+        PCMCIA_DEVICE_CIS_PROD_ID123("ADVANTECH", "COMpad-32/85", "1.0", 0x96913a85, 0x8fbe92ae, 0x0877b627, "cis/COMpad2.cis"),
+        PCMCIA_DEVICE_CIS_PROD_ID2("RS-COM 2P", 0xad20b156, "cis/RS-COM-2P.cis"),
+        PCMCIA_DEVICE_CIS_MANF_CARD(0x0013, 0x0000, "cis/GLOBETROTTER.cis"),
+        PCMCIA_DEVICE_PROD_ID12("ELAN DIGITAL SYSTEMS LTD, c1997.","SERIAL CARD: SL100  1.00.",0x19ca78af,0xf964f42b),
+        PCMCIA_DEVICE_PROD_ID12("ELAN DIGITAL SYSTEMS LTD, c1997.","SERIAL CARD: SL100",0x19ca78af,0x71d98e83),
+        PCMCIA_DEVICE_PROD_ID12("ELAN DIGITAL SYSTEMS LTD, c1997.","SERIAL CARD: SL232  1.00.",0x19ca78af,0x69fb7490),
+        PCMCIA_DEVICE_PROD_ID12("ELAN DIGITAL SYSTEMS LTD, c1997.","SERIAL CARD: SL232",0x19ca78af,0xb6bc0235),
+        PCMCIA_DEVICE_PROD_ID12("ELAN DIGITAL SYSTEMS LTD, c2000.","SERIAL CARD: CF232",0x63f2e0bd,0xb9e175d3),
+        PCMCIA_DEVICE_PROD_ID12("ELAN DIGITAL SYSTEMS LTD, c2000.","SERIAL CARD: CF232-5",0x63f2e0bd,0xfce33442),
+        PCMCIA_DEVICE_PROD_ID12("Elan","Serial Port: CF232",0x3beb8cf2,0x171e7190),
+        PCMCIA_DEVICE_PROD_ID12("Elan","Serial Port: CF232-5",0x3beb8cf2,0x20da4262),
+        PCMCIA_DEVICE_PROD_ID12("Elan","Serial Port: CF428",0x3beb8cf2,0xea5dd57d),
+        PCMCIA_DEVICE_PROD_ID12("Elan","Serial Port: CF500",0x3beb8cf2,0xd77255fa),
+        PCMCIA_DEVICE_PROD_ID12("Elan","Serial Port: IC232",0x3beb8cf2,0x6a709903),
+        PCMCIA_DEVICE_PROD_ID12("Elan","Serial Port: SL232",0x3beb8cf2,0x18430676),
+        PCMCIA_DEVICE_PROD_ID12("Elan","Serial Port: XL232",0x3beb8cf2,0x6f933767),
+        PCMCIA_MFC_DEVICE_PROD_ID12(0,"Elan","Serial Port: CF332",0x3beb8cf2,0x16dc1ba7),
+        PCMCIA_MFC_DEVICE_PROD_ID12(0,"Elan","Serial Port: SL332",0x3beb8cf2,0x19816c41),
+        PCMCIA_MFC_DEVICE_PROD_ID12(0,"Elan","Serial Port: SL385",0x3beb8cf2,0x64112029),
+        PCMCIA_MFC_DEVICE_PROD_ID12(0,"Elan","Serial Port: SL432",0x3beb8cf2,0x1cce7ac4),
+        PCMCIA_MFC_DEVICE_PROD_ID12(0,"Elan","Serial+Parallel Port: SP230",0x3beb8cf2,0xdb9e58bc),
+        PCMCIA_MFC_DEVICE_PROD_ID12(1,"Elan","Serial Port: CF332",0x3beb8cf2,0x16dc1ba7),
+        PCMCIA_MFC_DEVICE_PROD_ID12(1,"Elan","Serial Port: SL332",0x3beb8cf2,0x19816c41),
+        PCMCIA_MFC_DEVICE_PROD_ID12(1,"Elan","Serial Port: SL385",0x3beb8cf2,0x64112029),
+        PCMCIA_MFC_DEVICE_PROD_ID12(1,"Elan","Serial Port: SL432",0x3beb8cf2,0x1cce7ac4),
+        PCMCIA_MFC_DEVICE_PROD_ID12(2,"Elan","Serial Port: SL432",0x3beb8cf2,0x1cce7ac4),
+        PCMCIA_MFC_DEVICE_PROD_ID12(3,"Elan","Serial Port: SL432",0x3beb8cf2,0x1cce7ac4),
+        PCMCIA_DEVICE_MANF_CARD(0x0279, 0x950b),
+        /* too generic */
+        /* PCMCIA_MFC_DEVICE_MANF_CARD(0, 0x0160, 0x0002), */
+        /* PCMCIA_MFC_DEVICE_MANF_CARD(1, 0x0160, 0x0002), */
+        PCMCIA_DEVICE_FUNC_ID(2),
+        PCMCIA_DEVICE_NULL,
+};
+MODULE_DEVICE_TABLE(pcmcia, serial_ids);
+
+MODULE_FIRMWARE("cis/PCMLM28.cis");
+MODULE_FIRMWARE("cis/DP83903.cis");
+MODULE_FIRMWARE("cis/3CCFEM556.cis");
+MODULE_FIRMWARE("cis/3CXEM556.cis");
+MODULE_FIRMWARE("cis/SW_8xx_SER.cis");
+MODULE_FIRMWARE("cis/SW_7xx_SER.cis");
+MODULE_FIRMWARE("cis/SW_555_SER.cis");
+MODULE_FIRMWARE("cis/MT5634ZLX.cis");
+MODULE_FIRMWARE("cis/COMpad2.cis");
+MODULE_FIRMWARE("cis/COMpad4.cis");
+MODULE_FIRMWARE("cis/RS-COM-2P.cis");
+
+static struct pcmcia_driver serial_cs_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "serial_cs",
+        .probe          = serial_probe,
+        .remove         = serial_detach,
+        .id_table       = serial_ids,
+        .suspend        = serial_suspend,
+        .resume         = serial_resume,
+};
+
+static int __init init_serial_cs(void)
+{
+        return pcmcia_register_driver(&serial_cs_driver);
+}
+
+static void __exit exit_serial_cs(void)
+{
+        pcmcia_unregister_driver(&serial_cs_driver);
+}
+
+module_init(init_serial_cs);
+module_exit(exit_serial_cs);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/serial_ks8695.c b/drivers/tty/serial/serial_ks8695.c
new file mode 100644
index 000000000000..2430319f2f52
--- /dev/null
+++ b/drivers/tty/serial/serial_ks8695.c
@@ -0,0 +1,703 @@
+/*
+ *  Driver for KS8695 serial ports
+ *
+ *  Based on drivers/serial/serial_amba.c, by Kam Lee.
+ *
+ *  Copyright 2002-2005 Micrel Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+
+#include <mach/regs-uart.h>
+#include <mach/regs-irq.h>
+
+#if defined(CONFIG_SERIAL_KS8695_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+
+#define SERIAL_KS8695_MAJOR     204
+#define SERIAL_KS8695_MINOR     16
+#define SERIAL_KS8695_DEVNAME   "ttyAM"
+
+#define SERIAL_KS8695_NR        1
+
+/*
+ * Access macros for the KS8695 UART
+ */
+#define UART_GET_CHAR(p)        (__raw_readl((p)->membase + KS8695_URRB) & 0xFF)
+#define UART_PUT_CHAR(p, c)     __raw_writel((c), (p)->membase + KS8695_URTH)
+#define UART_GET_FCR(p)         __raw_readl((p)->membase + KS8695_URFC)
+#define UART_PUT_FCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URFC)
+#define UART_GET_MSR(p)         __raw_readl((p)->membase + KS8695_URMS)
+#define UART_GET_LSR(p)         __raw_readl((p)->membase + KS8695_URLS)
+#define UART_GET_LCR(p)         __raw_readl((p)->membase + KS8695_URLC)
+#define UART_PUT_LCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URLC)
+#define UART_GET_MCR(p)         __raw_readl((p)->membase + KS8695_URMC)
+#define UART_PUT_MCR(p, c)      __raw_writel((c), (p)->membase + KS8695_URMC)
+#define UART_GET_BRDR(p)        __raw_readl((p)->membase + KS8695_URBD)
+#define UART_PUT_BRDR(p, c)     __raw_writel((c), (p)->membase + KS8695_URBD)
+
+#define KS8695_CLR_TX_INT()     __raw_writel(1 << KS8695_IRQ_UART_TX, KS8695_IRQ_VA + KS8695_INTST)
+
+#define UART_DUMMY_LSR_RX       0x100
+#define UART_PORT_SIZE          (KS8695_USR - KS8695_URRB + 4)
+
+static inline int tx_enabled(struct uart_port *port)
+{
+        return port->unused[0] & 1;
+}
+
+static inline int rx_enabled(struct uart_port *port)
+{
+        return port->unused[0] & 2;
+}
+
+static inline int ms_enabled(struct uart_port *port)
+{
+        return port->unused[0] & 4;
+}
+
+static inline void ms_enable(struct uart_port *port, int enabled)
+{
+        if(enabled)
+                port->unused[0] |= 4;
+        else
+                port->unused[0] &= ~4;
+}
+
+static inline void rx_enable(struct uart_port *port, int enabled)
+{
+        if(enabled)
+                port->unused[0] |= 2;
+        else
+                port->unused[0] &= ~2;
+}
+
+static inline void tx_enable(struct uart_port *port, int enabled)
+{
+        if(enabled)
+                port->unused[0] |= 1;
+        else
+                port->unused[0] &= ~1;
+}
+
+
+#ifdef SUPPORT_SYSRQ
+static struct console ks8695_console;
+#endif
+
+static void ks8695uart_stop_tx(struct uart_port *port)
+{
+        if (tx_enabled(port)) {
+                /* use disable_irq_nosync() and not disable_irq() to avoid self
+                 * imposed deadlock by not waiting for irq handler to end,
+                 * since this ks8695uart_stop_tx() is called from interrupt context.
+                 */
+                disable_irq_nosync(KS8695_IRQ_UART_TX);
+                tx_enable(port, 0);
+        }
+}
+
+static void ks8695uart_start_tx(struct uart_port *port)
+{
+        if (!tx_enabled(port)) {
+                enable_irq(KS8695_IRQ_UART_TX);
+                tx_enable(port, 1);
+        }
+}
+
+static void ks8695uart_stop_rx(struct uart_port *port)
+{
+        if (rx_enabled(port)) {
+                disable_irq(KS8695_IRQ_UART_RX);
+                rx_enable(port, 0);
+        }
+}
+
+static void ks8695uart_enable_ms(struct uart_port *port)
+{
+        if (!ms_enabled(port)) {
+                enable_irq(KS8695_IRQ_UART_MODEM_STATUS);
+                ms_enable(port,1);
+        }
+}
+
+static void ks8695uart_disable_ms(struct uart_port *port)
+{
+        if (ms_enabled(port)) {
+                disable_irq(KS8695_IRQ_UART_MODEM_STATUS);
+                ms_enable(port,0);
+        }
+}
+
+static irqreturn_t ks8695uart_rx_chars(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned int status, ch, lsr, flg, max_count = 256;
+
+        status = UART_GET_LSR(port);            /* clears pending LSR interrupts */
+        while ((status & URLS_URDR) && max_count--) {
+                ch = UART_GET_CHAR(port);
+                flg = TTY_NORMAL;
+
+                port->icount.rx++;
+
+                /*
+                 * Note that the error handling code is
+                 * out of the main execution path
+                 */
+                lsr = UART_GET_LSR(port) | UART_DUMMY_LSR_RX;
+                if (unlikely(lsr & (URLS_URBI | URLS_URPE | URLS_URFE | URLS_URROE))) {
+                        if (lsr & URLS_URBI) {
+                                lsr &= ~(URLS_URFE | URLS_URPE);
+                                port->icount.brk++;
+                                if (uart_handle_break(port))
+                                        goto ignore_char;
+                        }
+                        if (lsr & URLS_URPE)
+                                port->icount.parity++;
+                        if (lsr & URLS_URFE)
+                                port->icount.frame++;
+                        if (lsr & URLS_URROE)
+                                port->icount.overrun++;
+
+                        lsr &= port->read_status_mask;
+
+                        if (lsr & URLS_URBI)
+                                flg = TTY_BREAK;
+                        else if (lsr & URLS_URPE)
+                                flg = TTY_PARITY;
+                        else if (lsr & URLS_URFE)
+                                flg = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(port, lsr, URLS_URROE, ch, flg);
+
+ignore_char:
+                status = UART_GET_LSR(port);
+        }
+        tty_flip_buffer_push(tty);
+
+        return IRQ_HANDLED;
+}
+
+
+static irqreturn_t ks8695uart_tx_chars(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct circ_buf *xmit = &port->state->xmit;
+        unsigned int count;
+
+        if (port->x_char) {
+                KS8695_CLR_TX_INT();
+                UART_PUT_CHAR(port, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+                return IRQ_HANDLED;
+        }
+
+        if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
+                ks8695uart_stop_tx(port);
+                return IRQ_HANDLED;
+        }
+
+        count = 16;     /* fifo size */
+        while (!uart_circ_empty(xmit) && (count-- > 0)) {
+                KS8695_CLR_TX_INT();
+                UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
+
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                ks8695uart_stop_tx(port);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t ks8695uart_modem_status(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        unsigned int status;
+
+        /*
+         * clear modem interrupt by reading MSR
+         */
+        status = UART_GET_MSR(port);
+
+        if (status & URMS_URDDCD)
+                uart_handle_dcd_change(port, status & URMS_URDDCD);
+
+        if (status & URMS_URDDST)
+                port->icount.dsr++;
+
+        if (status & URMS_URDCTS)
+                uart_handle_cts_change(port, status & URMS_URDCTS);
+
+        if (status & URMS_URTERI)
+                port->icount.rng++;
+
+        wake_up_interruptible(&port->state->port.delta_msr_wait);
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int ks8695uart_tx_empty(struct uart_port *port)
+{
+        return (UART_GET_LSR(port) & URLS_URTE) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int ks8695uart_get_mctrl(struct uart_port *port)
+{
+        unsigned int result = 0;
+        unsigned int status;
+
+        status = UART_GET_MSR(port);
+        if (status & URMS_URDCD)
+                result |= TIOCM_CAR;
+        if (status & URMS_URDSR)
+                result |= TIOCM_DSR;
+        if (status & URMS_URCTS)
+                result |= TIOCM_CTS;
+        if (status & URMS_URRI)
+                result |= TIOCM_RI;
+
+        return result;
+}
+
+static void ks8695uart_set_mctrl(struct uart_port *port, u_int mctrl)
+{
+        unsigned int mcr;
+
+        mcr = UART_GET_MCR(port);
+        if (mctrl & TIOCM_RTS)
+                mcr |= URMC_URRTS;
+        else
+                mcr &= ~URMC_URRTS;
+
+        if (mctrl & TIOCM_DTR)
+                mcr |= URMC_URDTR;
+        else
+                mcr &= ~URMC_URDTR;
+
+        UART_PUT_MCR(port, mcr);
+}
+
+static void ks8695uart_break_ctl(struct uart_port *port, int break_state)
+{
+        unsigned int lcr;
+
+        lcr = UART_GET_LCR(port);
+
+        if (break_state == -1)
+                lcr |= URLC_URSBC;
+        else
+                lcr &= ~URLC_URSBC;
+
+        UART_PUT_LCR(port, lcr);
+}
+
+static int ks8695uart_startup(struct uart_port *port)
+{
+        int retval;
+
+        set_irq_flags(KS8695_IRQ_UART_TX, IRQF_VALID | IRQF_NOAUTOEN);
+        tx_enable(port, 0);
+        rx_enable(port, 1);
+        ms_enable(port, 1);
+
+        /*
+         * Allocate the IRQ
+         */
+        retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port);
+        if (retval)
+                goto err_tx;
+
+        retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port);
+        if (retval)
+                goto err_rx;
+
+        retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port);
+        if (retval)
+                goto err_ls;
+
+        retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port);
+        if (retval)
+                goto err_ms;
+
+        return 0;
+
+err_ms:
+        free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
+err_ls:
+        free_irq(KS8695_IRQ_UART_RX, port);
+err_rx:
+        free_irq(KS8695_IRQ_UART_TX, port);
+err_tx:
+        return retval;
+}
+
+static void ks8695uart_shutdown(struct uart_port *port)
+{
+        /*
+         * Free the interrupt
+         */
+        free_irq(KS8695_IRQ_UART_RX, port);
+        free_irq(KS8695_IRQ_UART_TX, port);
+        free_irq(KS8695_IRQ_UART_MODEM_STATUS, port);
+        free_irq(KS8695_IRQ_UART_LINE_STATUS, port);
+
+        /* disable break condition and fifos */
+        UART_PUT_LCR(port, UART_GET_LCR(port) & ~URLC_URSBC);
+        UART_PUT_FCR(port, UART_GET_FCR(port) & ~URFC_URFE);
+}
+
+static void ks8695uart_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old)
+{
+        unsigned int lcr, fcr = 0;
+        unsigned long flags;
+        unsigned int baud, quot;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+        quot = uart_get_divisor(port, baud);
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                lcr = URCL_5;
+                break;
+        case CS6:
+                lcr = URCL_6;
+                break;
+        case CS7:
+                lcr = URCL_7;
+                break;
+        default:
+                lcr = URCL_8;
+                break;
+        }
+
+        /* stop bits */
+        if (termios->c_cflag & CSTOPB)
+                lcr |= URLC_URSB;
+
+        /* parity */
+        if (termios->c_cflag & PARENB) {
+                if (termios->c_cflag & CMSPAR) {        /* Mark or Space parity */
+                        if (termios->c_cflag & PARODD)
+                                lcr |= URPE_MARK;
+                        else
+                                lcr |= URPE_SPACE;
+                }
+                else if (termios->c_cflag & PARODD)
+                        lcr |= URPE_ODD;
+                else
+                        lcr |= URPE_EVEN;
+        }
+
+        if (port->fifosize > 1)
+                fcr = URFC_URFRT_8 | URFC_URTFR | URFC_URRFR | URFC_URFE;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        port->read_status_mask = URLS_URROE;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= (URLS_URFE | URLS_URPE);
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= URLS_URBI;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= (URLS_URFE | URLS_URPE);
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= URLS_URBI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= URLS_URROE;
+        }
+
+        /*
+         * Ignore all characters if CREAD is not set.
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->ignore_status_mask |= UART_DUMMY_LSR_RX;
+
+        /* first, disable everything */
+        if (UART_ENABLE_MS(port, termios->c_cflag))
+                ks8695uart_enable_ms(port);
+        else
+                ks8695uart_disable_ms(port);
+
+        /* Set baud rate */
+        UART_PUT_BRDR(port, quot);
+
+        UART_PUT_LCR(port, lcr);
+        UART_PUT_FCR(port, fcr);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *ks8695uart_type(struct uart_port *port)
+{
+        return port->type == PORT_KS8695 ? "KS8695" : NULL;
+}
+
+/*
+ * Release the memory region(s) being used by 'port'
+ */
+static void ks8695uart_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, UART_PORT_SIZE);
+}
+
+/*
+ * Request the memory region(s) being used by 'port'
+ */
+static int ks8695uart_request_port(struct uart_port *port)
+{
+        return request_mem_region(port->mapbase, UART_PORT_SIZE,
+                        "serial_ks8695") != NULL ? 0 : -EBUSY;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void ks8695uart_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_KS8695;
+                ks8695uart_request_port(port);
+        }
+}
+
+/*
+ * verify the new serial_struct (for TIOCSSERIAL).
+ */
+static int ks8695uart_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_KS8695)
+                ret = -EINVAL;
+        if (ser->irq != port->irq)
+                ret = -EINVAL;
+        if (ser->baud_base < 9600)
+                ret = -EINVAL;
+        return ret;
+}
+
+static struct uart_ops ks8695uart_pops = {
+        .tx_empty       = ks8695uart_tx_empty,
+        .set_mctrl      = ks8695uart_set_mctrl,
+        .get_mctrl      = ks8695uart_get_mctrl,
+        .stop_tx        = ks8695uart_stop_tx,
+        .start_tx       = ks8695uart_start_tx,
+        .stop_rx        = ks8695uart_stop_rx,
+        .enable_ms      = ks8695uart_enable_ms,
+        .break_ctl      = ks8695uart_break_ctl,
+        .startup        = ks8695uart_startup,
+        .shutdown       = ks8695uart_shutdown,
+        .set_termios    = ks8695uart_set_termios,
+        .type           = ks8695uart_type,
+        .release_port   = ks8695uart_release_port,
+        .request_port   = ks8695uart_request_port,
+        .config_port    = ks8695uart_config_port,
+        .verify_port    = ks8695uart_verify_port,
+};
+
+static struct uart_port ks8695uart_ports[SERIAL_KS8695_NR] = {
+        {
+                .membase        = (void *) KS8695_UART_VA,
+                .mapbase        = KS8695_UART_VA,
+                .iotype         = SERIAL_IO_MEM,
+                .irq            = KS8695_IRQ_UART_TX,
+                .uartclk        = KS8695_CLOCK_RATE * 16,
+                .fifosize       = 16,
+                .ops            = &ks8695uart_pops,
+                .flags          = ASYNC_BOOT_AUTOCONF,
+                .line           = 0,
+        }
+};
+
+#ifdef CONFIG_SERIAL_KS8695_CONSOLE
+static void ks8695_console_putchar(struct uart_port *port, int ch)
+{
+        while (!(UART_GET_LSR(port) & URLS_URTHRE))
+                barrier();
+
+        UART_PUT_CHAR(port, ch);
+}
+
+static void ks8695_console_write(struct console *co, const char *s, u_int count)
+{
+        struct uart_port *port = ks8695uart_ports + co->index;
+
+        uart_console_write(port, s, count, ks8695_console_putchar);
+}
+
+static void __init ks8695_console_get_options(struct uart_port *port, int *baud, int *parity, int *bits)
+{
+        unsigned int lcr;
+
+        lcr = UART_GET_LCR(port);
+
+        switch (lcr & URLC_PARITY) {
+                case URPE_ODD:
+                        *parity = 'o';
+                        break;
+                case URPE_EVEN:
+                        *parity = 'e';
+                        break;
+                default:
+                        *parity = 'n';
+        }
+
+        switch (lcr & URLC_URCL) {
+                case URCL_5:
+                        *bits = 5;
+                        break;
+                case URCL_6:
+                        *bits = 6;
+                        break;
+                case URCL_7:
+                        *bits = 7;
+                        break;
+                default:
+                        *bits = 8;
+        }
+
+        *baud = port->uartclk / (UART_GET_BRDR(port) & 0x0FFF);
+        *baud /= 16;
+        *baud &= 0xFFFFFFF0;
+}
+
+static int __init ks8695_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        port = uart_get_console(ks8695uart_ports, SERIAL_KS8695_NR, co);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        else
+                ks8695_console_get_options(port, &baud, &parity, &bits);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver ks8695_reg;
+
+static struct console ks8695_console = {
+        .name           = SERIAL_KS8695_DEVNAME,
+        .write          = ks8695_console_write,
+        .device         = uart_console_device,
+        .setup          = ks8695_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &ks8695_reg,
+};
+
+static int __init ks8695_console_init(void)
+{
+        add_preferred_console(SERIAL_KS8695_DEVNAME, 0, NULL);
+        register_console(&ks8695_console);
+        return 0;
+}
+
+console_initcall(ks8695_console_init);
+
+#define KS8695_CONSOLE  &ks8695_console
+#else
+#define KS8695_CONSOLE  NULL
+#endif
+
+static struct uart_driver ks8695_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "serial_ks8695",
+        .dev_name               = SERIAL_KS8695_DEVNAME,
+        .major                  = SERIAL_KS8695_MAJOR,
+        .minor                  = SERIAL_KS8695_MINOR,
+        .nr                     = SERIAL_KS8695_NR,
+        .cons                   = KS8695_CONSOLE,
+};
+
+static int __init ks8695uart_init(void)
+{
+        int i, ret;
+
+        printk(KERN_INFO "Serial: Micrel KS8695 UART driver\n");
+
+        ret = uart_register_driver(&ks8695_reg);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < SERIAL_KS8695_NR; i++)
+                uart_add_one_port(&ks8695_reg, &ks8695uart_ports[0]);
+
+        return 0;
+}
+
+static void __exit ks8695uart_exit(void)
+{
+        int i;
+
+        for (i = 0; i < SERIAL_KS8695_NR; i++)
+                uart_remove_one_port(&ks8695_reg, &ks8695uart_ports[0]);
+        uart_unregister_driver(&ks8695_reg);
+}
+
+module_init(ks8695uart_init);
+module_exit(ks8695uart_exit);
+
+MODULE_DESCRIPTION("KS8695 serial port driver");
+MODULE_AUTHOR("Micrel Inc.");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
new file mode 100644
index 000000000000..8e3fc1944e6d
--- /dev/null
+++ b/drivers/tty/serial/serial_txx9.c
@@ -0,0 +1,1342 @@
+/*
+ * Derived from many drivers using generic_serial interface,
+ * especially serial_tx3912.c by Steven J. Hill and r39xx_serial.c
+ * (was in Linux/VR tree) by Jim Pick.
+ *
+ *  Copyright (C) 1999 Harald Koerfgen
+ *  Copyright (C) 2000 Jim Pick <jim@jimpick.com>
+ *  Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
+ *  Copyright (C) 2000-2002 Toshiba Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Serial driver for TX3927/TX4927/TX4925/TX4938 internal SIO controller
+ */
+
+#if defined(CONFIG_SERIAL_TXX9_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/pci.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/io.h>
+
+static char *serial_version = "1.11";
+static char *serial_name = "TX39/49 Serial driver";
+
+#define PASS_LIMIT      256
+
+#if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
+/* "ttyS" is used for standard serial driver */
+#define TXX9_TTY_NAME "ttyTX"
+#define TXX9_TTY_MINOR_START    196
+#define TXX9_TTY_MAJOR  204
+#else
+/* acts like standard serial driver */
+#define TXX9_TTY_NAME "ttyS"
+#define TXX9_TTY_MINOR_START    64
+#define TXX9_TTY_MAJOR  TTY_MAJOR
+#endif
+
+/* flag aliases */
+#define UPF_TXX9_HAVE_CTS_LINE  UPF_BUGGY_UART
+#define UPF_TXX9_USE_SCLK       UPF_MAGIC_MULTIPLIER
+
+#ifdef CONFIG_PCI
+/* support for Toshiba TC86C001 SIO */
+#define ENABLE_SERIAL_TXX9_PCI
+#endif
+
+/*
+ * Number of serial ports
+ */
+#define UART_NR  CONFIG_SERIAL_TXX9_NR_UARTS
+
+struct uart_txx9_port {
+        struct uart_port        port;
+        /* No additional info for now */
+};
+
+#define TXX9_REGION_SIZE        0x24
+
+/* TXX9 Serial Registers */
+#define TXX9_SILCR      0x00
+#define TXX9_SIDICR     0x04
+#define TXX9_SIDISR     0x08
+#define TXX9_SICISR     0x0c
+#define TXX9_SIFCR      0x10
+#define TXX9_SIFLCR     0x14
+#define TXX9_SIBGR      0x18
+#define TXX9_SITFIFO    0x1c
+#define TXX9_SIRFIFO    0x20
+
+/* SILCR : Line Control */
+#define TXX9_SILCR_SCS_MASK     0x00000060
+#define TXX9_SILCR_SCS_IMCLK    0x00000000
+#define TXX9_SILCR_SCS_IMCLK_BG 0x00000020
+#define TXX9_SILCR_SCS_SCLK     0x00000040
+#define TXX9_SILCR_SCS_SCLK_BG  0x00000060
+#define TXX9_SILCR_UEPS 0x00000010
+#define TXX9_SILCR_UPEN 0x00000008
+#define TXX9_SILCR_USBL_MASK    0x00000004
+#define TXX9_SILCR_USBL_1BIT    0x00000000
+#define TXX9_SILCR_USBL_2BIT    0x00000004
+#define TXX9_SILCR_UMODE_MASK   0x00000003
+#define TXX9_SILCR_UMODE_8BIT   0x00000000
+#define TXX9_SILCR_UMODE_7BIT   0x00000001
+
+/* SIDICR : DMA/Int. Control */
+#define TXX9_SIDICR_TDE 0x00008000
+#define TXX9_SIDICR_RDE 0x00004000
+#define TXX9_SIDICR_TIE 0x00002000
+#define TXX9_SIDICR_RIE 0x00001000
+#define TXX9_SIDICR_SPIE        0x00000800
+#define TXX9_SIDICR_CTSAC       0x00000600
+#define TXX9_SIDICR_STIE_MASK   0x0000003f
+#define TXX9_SIDICR_STIE_OERS           0x00000020
+#define TXX9_SIDICR_STIE_CTSS           0x00000010
+#define TXX9_SIDICR_STIE_RBRKD  0x00000008
+#define TXX9_SIDICR_STIE_TRDY           0x00000004
+#define TXX9_SIDICR_STIE_TXALS  0x00000002
+#define TXX9_SIDICR_STIE_UBRKD  0x00000001
+
+/* SIDISR : DMA/Int. Status */
+#define TXX9_SIDISR_UBRK        0x00008000
+#define TXX9_SIDISR_UVALID      0x00004000
+#define TXX9_SIDISR_UFER        0x00002000
+#define TXX9_SIDISR_UPER        0x00001000
+#define TXX9_SIDISR_UOER        0x00000800
+#define TXX9_SIDISR_ERI 0x00000400
+#define TXX9_SIDISR_TOUT        0x00000200
+#define TXX9_SIDISR_TDIS        0x00000100
+#define TXX9_SIDISR_RDIS        0x00000080
+#define TXX9_SIDISR_STIS        0x00000040
+#define TXX9_SIDISR_RFDN_MASK   0x0000001f
+
+/* SICISR : Change Int. Status */
+#define TXX9_SICISR_OERS        0x00000020
+#define TXX9_SICISR_CTSS        0x00000010
+#define TXX9_SICISR_RBRKD       0x00000008
+#define TXX9_SICISR_TRDY        0x00000004
+#define TXX9_SICISR_TXALS       0x00000002
+#define TXX9_SICISR_UBRKD       0x00000001
+
+/* SIFCR : FIFO Control */
+#define TXX9_SIFCR_SWRST        0x00008000
+#define TXX9_SIFCR_RDIL_MASK    0x00000180
+#define TXX9_SIFCR_RDIL_1       0x00000000
+#define TXX9_SIFCR_RDIL_4       0x00000080
+#define TXX9_SIFCR_RDIL_8       0x00000100
+#define TXX9_SIFCR_RDIL_12      0x00000180
+#define TXX9_SIFCR_RDIL_MAX     0x00000180
+#define TXX9_SIFCR_TDIL_MASK    0x00000018
+#define TXX9_SIFCR_TDIL_MASK    0x00000018
+#define TXX9_SIFCR_TDIL_1       0x00000000
+#define TXX9_SIFCR_TDIL_4       0x00000001
+#define TXX9_SIFCR_TDIL_8       0x00000010
+#define TXX9_SIFCR_TDIL_MAX     0x00000010
+#define TXX9_SIFCR_TFRST        0x00000004
+#define TXX9_SIFCR_RFRST        0x00000002
+#define TXX9_SIFCR_FRSTE        0x00000001
+#define TXX9_SIO_TX_FIFO        8
+#define TXX9_SIO_RX_FIFO        16
+
+/* SIFLCR : Flow Control */
+#define TXX9_SIFLCR_RCS 0x00001000
+#define TXX9_SIFLCR_TES 0x00000800
+#define TXX9_SIFLCR_RTSSC       0x00000200
+#define TXX9_SIFLCR_RSDE        0x00000100
+#define TXX9_SIFLCR_TSDE        0x00000080
+#define TXX9_SIFLCR_RTSTL_MASK  0x0000001e
+#define TXX9_SIFLCR_RTSTL_MAX   0x0000001e
+#define TXX9_SIFLCR_TBRK        0x00000001
+
+/* SIBGR : Baudrate Control */
+#define TXX9_SIBGR_BCLK_MASK    0x00000300
+#define TXX9_SIBGR_BCLK_T0      0x00000000
+#define TXX9_SIBGR_BCLK_T2      0x00000100
+#define TXX9_SIBGR_BCLK_T4      0x00000200
+#define TXX9_SIBGR_BCLK_T6      0x00000300
+#define TXX9_SIBGR_BRD_MASK     0x000000ff
+
+static inline unsigned int sio_in(struct uart_txx9_port *up, int offset)
+{
+        switch (up->port.iotype) {
+        default:
+                return __raw_readl(up->port.membase + offset);
+        case UPIO_PORT:
+                return inl(up->port.iobase + offset);
+        }
+}
+
+static inline void
+sio_out(struct uart_txx9_port *up, int offset, int value)
+{
+        switch (up->port.iotype) {
+        default:
+                __raw_writel(value, up->port.membase + offset);
+                break;
+        case UPIO_PORT:
+                outl(value, up->port.iobase + offset);
+                break;
+        }
+}
+
+static inline void
+sio_mask(struct uart_txx9_port *up, int offset, unsigned int value)
+{
+        sio_out(up, offset, sio_in(up, offset) & ~value);
+}
+static inline void
+sio_set(struct uart_txx9_port *up, int offset, unsigned int value)
+{
+        sio_out(up, offset, sio_in(up, offset) | value);
+}
+
+static inline void
+sio_quot_set(struct uart_txx9_port *up, int quot)
+{
+        quot >>= 1;
+        if (quot < 256)
+                sio_out(up, TXX9_SIBGR, quot | TXX9_SIBGR_BCLK_T0);
+        else if (quot < (256 << 2))
+                sio_out(up, TXX9_SIBGR, (quot >> 2) | TXX9_SIBGR_BCLK_T2);
+        else if (quot < (256 << 4))
+                sio_out(up, TXX9_SIBGR, (quot >> 4) | TXX9_SIBGR_BCLK_T4);
+        else if (quot < (256 << 6))
+                sio_out(up, TXX9_SIBGR, (quot >> 6) | TXX9_SIBGR_BCLK_T6);
+        else
+                sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
+}
+
+static struct uart_txx9_port *to_uart_txx9_port(struct uart_port *port)
+{
+        return container_of(port, struct uart_txx9_port, port);
+}
+
+static void serial_txx9_stop_tx(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
+}
+
+static void serial_txx9_start_tx(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
+}
+
+static void serial_txx9_stop_rx(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
+}
+
+static void serial_txx9_enable_ms(struct uart_port *port)
+{
+        /* TXX9-SIO can not control DTR... */
+}
+
+static void serial_txx9_initialize(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        unsigned int tmout = 10000;
+
+        sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
+        /* TX4925 BUG WORKAROUND.  Accessing SIOC register
+         * immediately after soft reset causes bus error. */
+        mmiowb();
+        udelay(1);
+        while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout)
+                udelay(1);
+        /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
+        sio_set(up, TXX9_SIFCR,
+                TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1);
+        /* initial settings */
+        sio_out(up, TXX9_SILCR,
+                TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
+                ((up->port.flags & UPF_TXX9_USE_SCLK) ?
+                 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
+        sio_quot_set(up, uart_get_divisor(port, 9600));
+        sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
+        sio_out(up, TXX9_SIDICR, 0);
+}
+
+static inline void
+receive_chars(struct uart_txx9_port *up, unsigned int *status)
+{
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned char ch;
+        unsigned int disr = *status;
+        int max_count = 256;
+        char flag;
+        unsigned int next_ignore_status_mask;
+
+        do {
+                ch = sio_in(up, TXX9_SIRFIFO);
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                /* mask out RFDN_MASK bit added by previous overrun */
+                next_ignore_status_mask =
+                        up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
+                if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
+                                     TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
+                        /*
+                         * For statistics only
+                         */
+                        if (disr & TXX9_SIDISR_UBRK) {
+                                disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
+                                up->port.icount.brk++;
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        goto ignore_char;
+                        } else if (disr & TXX9_SIDISR_UPER)
+                                up->port.icount.parity++;
+                        else if (disr & TXX9_SIDISR_UFER)
+                                up->port.icount.frame++;
+                        if (disr & TXX9_SIDISR_UOER) {
+                                up->port.icount.overrun++;
+                                /*
+                                 * The receiver read buffer still hold
+                                 * a char which caused overrun.
+                                 * Ignore next char by adding RFDN_MASK
+                                 * to ignore_status_mask temporarily.
+                                 */
+                                next_ignore_status_mask |=
+                                        TXX9_SIDISR_RFDN_MASK;
+                        }
+
+                        /*
+                         * Mask off conditions which should be ingored.
+                         */
+                        disr &= up->port.read_status_mask;
+
+                        if (disr & TXX9_SIDISR_UBRK) {
+                                flag = TTY_BREAK;
+                        } else if (disr & TXX9_SIDISR_UPER)
+                                flag = TTY_PARITY;
+                        else if (disr & TXX9_SIDISR_UFER)
+                                flag = TTY_FRAME;
+                }
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
+
+        ignore_char:
+                up->port.ignore_status_mask = next_ignore_status_mask;
+                disr = sio_in(up, TXX9_SIDISR);
+        } while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
+        spin_unlock(&up->port.lock);
+        tty_flip_buffer_push(tty);
+        spin_lock(&up->port.lock);
+        *status = disr;
+}
+
+static inline void transmit_chars(struct uart_txx9_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int count;
+
+        if (up->port.x_char) {
+                sio_out(up, TXX9_SITFIFO, up->port.x_char);
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+                serial_txx9_stop_tx(&up->port);
+                return;
+        }
+
+        count = TXX9_SIO_TX_FIFO;
+        do {
+                sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        if (uart_circ_empty(xmit))
+                serial_txx9_stop_tx(&up->port);
+}
+
+static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
+{
+        int pass_counter = 0;
+        struct uart_txx9_port *up = dev_id;
+        unsigned int status;
+
+        while (1) {
+                spin_lock(&up->port.lock);
+                status = sio_in(up, TXX9_SIDISR);
+                if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
+                        status &= ~TXX9_SIDISR_TDIS;
+                if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
+                                TXX9_SIDISR_TOUT))) {
+                        spin_unlock(&up->port.lock);
+                        break;
+                }
+
+                if (status & TXX9_SIDISR_RDIS)
+                        receive_chars(up, &status);
+                if (status & TXX9_SIDISR_TDIS)
+                        transmit_chars(up);
+                /* Clear TX/RX Int. Status */
+                sio_mask(up, TXX9_SIDISR,
+                         TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
+                         TXX9_SIDISR_TOUT);
+                spin_unlock(&up->port.lock);
+
+                if (pass_counter++ > PASS_LIMIT)
+                        break;
+        }
+
+        return pass_counter ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static unsigned int serial_txx9_tx_empty(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        unsigned long flags;
+        unsigned int ret;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return ret;
+}
+
+static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        unsigned int ret;
+
+        /* no modem control lines */
+        ret = TIOCM_CAR | TIOCM_DSR;
+        ret |= (sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS;
+        ret |= (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS;
+
+        return ret;
+}
+
+static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+
+        if (mctrl & TIOCM_RTS)
+                sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
+        else
+                sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
+}
+
+static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (break_state == -1)
+                sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
+        else
+                sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+#if defined(CONFIG_SERIAL_TXX9_CONSOLE) || (CONFIG_CONSOLE_POLL)
+/*
+ *      Wait for transmitter & holding register to empty
+ */
+static void wait_for_xmitr(struct uart_txx9_port *up)
+{
+        unsigned int tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        while (--tmout &&
+               !(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
+                udelay(1);
+
+        /* Wait up to 1s for flow control if necessary */
+        if (up->port.flags & UPF_CONS_FLOW) {
+                tmout = 1000000;
+                while (--tmout &&
+                       (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
+                        udelay(1);
+        }
+}
+#endif
+
+#ifdef CONFIG_CONSOLE_POLL
+/*
+ * Console polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+static int serial_txx9_get_poll_char(struct uart_port *port)
+{
+        unsigned int ier;
+        unsigned char c;
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+
+        /*
+         *      First save the IER then disable the interrupts
+         */
+        ier = sio_in(up, TXX9_SIDICR);
+        sio_out(up, TXX9_SIDICR, 0);
+
+        while (sio_in(up, TXX9_SIDISR) & TXX9_SIDISR_UVALID)
+                ;
+
+        c = sio_in(up, TXX9_SIRFIFO);
+
+        /*
+         *      Finally, clear RX interrupt status
+         *      and restore the IER
+         */
+        sio_mask(up, TXX9_SIDISR, TXX9_SIDISR_RDIS);
+        sio_out(up, TXX9_SIDICR, ier);
+        return c;
+}
+
+
+static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
+{
+        unsigned int ier;
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+
+        /*
+         *      First save the IER then disable the interrupts
+         */
+        ier = sio_in(up, TXX9_SIDICR);
+        sio_out(up, TXX9_SIDICR, 0);
+
+        wait_for_xmitr(up);
+        /*
+         *      Send the character out.
+         *      If a LF, also do CR...
+         */
+        sio_out(up, TXX9_SITFIFO, c);
+        if (c == 10) {
+                wait_for_xmitr(up);
+                sio_out(up, TXX9_SITFIFO, 13);
+        }
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the IER
+         */
+        wait_for_xmitr(up);
+        sio_out(up, TXX9_SIDICR, ier);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
+static int serial_txx9_startup(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        unsigned long flags;
+        int retval;
+
+        /*
+         * Clear the FIFO buffers and disable them.
+         * (they will be reenabled in set_termios())
+         */
+        sio_set(up, TXX9_SIFCR,
+                TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
+        /* clear reset */
+        sio_mask(up, TXX9_SIFCR,
+                 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
+        sio_out(up, TXX9_SIDICR, 0);
+
+        /*
+         * Clear the interrupt registers.
+         */
+        sio_out(up, TXX9_SIDISR, 0);
+
+        retval = request_irq(up->port.irq, serial_txx9_interrupt,
+                             IRQF_SHARED, "serial_txx9", up);
+        if (retval)
+                return retval;
+
+        /*
+         * Now, initialize the UART
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+        serial_txx9_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /* Enable RX/TX */
+        sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
+
+        /*
+         * Finally, enable interrupts.
+         */
+        sio_set(up, TXX9_SIDICR, TXX9_SIDICR_RIE);
+
+        return 0;
+}
+
+static void serial_txx9_shutdown(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        unsigned long flags;
+
+        /*
+         * Disable interrupts from this port
+         */
+        sio_out(up, TXX9_SIDICR, 0);    /* disable all intrs */
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        serial_txx9_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Disable break condition
+         */
+        sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
+
+#ifdef CONFIG_SERIAL_TXX9_CONSOLE
+        if (up->port.cons && up->port.line == up->port.cons->index) {
+                free_irq(up->port.irq, up);
+                return;
+        }
+#endif
+        /* reset FIFOs */
+        sio_set(up, TXX9_SIFCR,
+                TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
+        /* clear reset */
+        sio_mask(up, TXX9_SIFCR,
+                 TXX9_SIFCR_TFRST | TXX9_SIFCR_RFRST | TXX9_SIFCR_FRSTE);
+
+        /* Disable RX/TX */
+        sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
+
+        free_irq(up->port.irq, up);
+}
+
+static void
+serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
+                       struct ktermios *old)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        unsigned int cval, fcr = 0;
+        unsigned long flags;
+        unsigned int baud, quot;
+
+        /*
+         * We don't support modem control lines.
+         */
+        termios->c_cflag &= ~(HUPCL | CMSPAR);
+        termios->c_cflag |= CLOCAL;
+
+        cval = sio_in(up, TXX9_SILCR);
+        /* byte size and parity */
+        cval &= ~TXX9_SILCR_UMODE_MASK;
+        switch (termios->c_cflag & CSIZE) {
+        case CS7:
+                cval |= TXX9_SILCR_UMODE_7BIT;
+                break;
+        default:
+        case CS5:       /* not supported */
+        case CS6:       /* not supported */
+        case CS8:
+                cval |= TXX9_SILCR_UMODE_8BIT;
+                break;
+        }
+
+        cval &= ~TXX9_SILCR_USBL_MASK;
+        if (termios->c_cflag & CSTOPB)
+                cval |= TXX9_SILCR_USBL_2BIT;
+        else
+                cval |= TXX9_SILCR_USBL_1BIT;
+        cval &= ~(TXX9_SILCR_UPEN | TXX9_SILCR_UEPS);
+        if (termios->c_cflag & PARENB)
+                cval |= TXX9_SILCR_UPEN;
+        if (!(termios->c_cflag & PARODD))
+                cval |= TXX9_SILCR_UEPS;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2);
+        quot = uart_get_divisor(port, baud);
+
+        /* Set up FIFOs */
+        /* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
+        fcr = TXX9_SIFCR_TDIL_MAX | TXX9_SIFCR_RDIL_1;
+
+        /*
+         * Ok, we're now changing the port state.  Do it with
+         * interrupts disabled.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        up->port.read_status_mask = TXX9_SIDISR_UOER |
+                TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
+        if (termios->c_iflag & INPCK)
+                up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= TXX9_SIDISR_UBRK;
+
+        /*
+         * Characteres to ignore
+         */
+        up->port.ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
+        if (termios->c_iflag & IGNBRK) {
+                up->port.ignore_status_mask |= TXX9_SIDISR_UBRK;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        up->port.ignore_status_mask |= TXX9_SIDISR_UOER;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= TXX9_SIDISR_RDIS;
+
+        /* CTS flow control flag */
+        if ((termios->c_cflag & CRTSCTS) &&
+            (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) {
+                sio_set(up, TXX9_SIFLCR,
+                        TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
+        } else {
+                sio_mask(up, TXX9_SIFLCR,
+                         TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
+        }
+
+        sio_out(up, TXX9_SILCR, cval);
+        sio_quot_set(up, quot);
+        sio_out(up, TXX9_SIFCR, fcr);
+
+        serial_txx9_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+serial_txx9_pm(struct uart_port *port, unsigned int state,
+              unsigned int oldstate)
+{
+        /*
+         * If oldstate was -1 this is called from
+         * uart_configure_port().  In this case do not initialize the
+         * port now, because the port was already initialized (for
+         * non-console port) or should not be initialized here (for
+         * console port).  If we initialized the port here we lose
+         * serial console settings.
+         */
+        if (state == 0 && oldstate != -1)
+                serial_txx9_initialize(port);
+}
+
+static int serial_txx9_request_resource(struct uart_txx9_port *up)
+{
+        unsigned int size = TXX9_REGION_SIZE;
+        int ret = 0;
+
+        switch (up->port.iotype) {
+        default:
+                if (!up->port.mapbase)
+                        break;
+
+                if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) {
+                        ret = -EBUSY;
+                        break;
+                }
+
+                if (up->port.flags & UPF_IOREMAP) {
+                        up->port.membase = ioremap(up->port.mapbase, size);
+                        if (!up->port.membase) {
+                                release_mem_region(up->port.mapbase, size);
+                                ret = -ENOMEM;
+                        }
+                }
+                break;
+
+        case UPIO_PORT:
+                if (!request_region(up->port.iobase, size, "serial_txx9"))
+                        ret = -EBUSY;
+                break;
+        }
+        return ret;
+}
+
+static void serial_txx9_release_resource(struct uart_txx9_port *up)
+{
+        unsigned int size = TXX9_REGION_SIZE;
+
+        switch (up->port.iotype) {
+        default:
+                if (!up->port.mapbase)
+                        break;
+
+                if (up->port.flags & UPF_IOREMAP) {
+                        iounmap(up->port.membase);
+                        up->port.membase = NULL;
+                }
+
+                release_mem_region(up->port.mapbase, size);
+                break;
+
+        case UPIO_PORT:
+                release_region(up->port.iobase, size);
+                break;
+        }
+}
+
+static void serial_txx9_release_port(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        serial_txx9_release_resource(up);
+}
+
+static int serial_txx9_request_port(struct uart_port *port)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        return serial_txx9_request_resource(up);
+}
+
+static void serial_txx9_config_port(struct uart_port *port, int uflags)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+        int ret;
+
+        /*
+         * Find the region that we can probe for.  This in turn
+         * tells us whether we can probe for the type of port.
+         */
+        ret = serial_txx9_request_resource(up);
+        if (ret < 0)
+                return;
+        port->type = PORT_TXX9;
+        up->port.fifosize = TXX9_SIO_TX_FIFO;
+
+#ifdef CONFIG_SERIAL_TXX9_CONSOLE
+        if (up->port.line == up->port.cons->index)
+                return;
+#endif
+        serial_txx9_initialize(port);
+}
+
+static const char *
+serial_txx9_type(struct uart_port *port)
+{
+        return "txx9";
+}
+
+static struct uart_ops serial_txx9_pops = {
+        .tx_empty       = serial_txx9_tx_empty,
+        .set_mctrl      = serial_txx9_set_mctrl,
+        .get_mctrl      = serial_txx9_get_mctrl,
+        .stop_tx        = serial_txx9_stop_tx,
+        .start_tx       = serial_txx9_start_tx,
+        .stop_rx        = serial_txx9_stop_rx,
+        .enable_ms      = serial_txx9_enable_ms,
+        .break_ctl      = serial_txx9_break_ctl,
+        .startup        = serial_txx9_startup,
+        .shutdown       = serial_txx9_shutdown,
+        .set_termios    = serial_txx9_set_termios,
+        .pm             = serial_txx9_pm,
+        .type           = serial_txx9_type,
+        .release_port   = serial_txx9_release_port,
+        .request_port   = serial_txx9_request_port,
+        .config_port    = serial_txx9_config_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char  = serial_txx9_get_poll_char,
+        .poll_put_char  = serial_txx9_put_poll_char,
+#endif
+};
+
+static struct uart_txx9_port serial_txx9_ports[UART_NR];
+
+static void __init serial_txx9_register_ports(struct uart_driver *drv,
+                                              struct device *dev)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_txx9_port *up = &serial_txx9_ports[i];
+
+                up->port.line = i;
+                up->port.ops = &serial_txx9_pops;
+                up->port.dev = dev;
+                if (up->port.iobase || up->port.mapbase)
+                        uart_add_one_port(drv, &up->port);
+        }
+}
+
+#ifdef CONFIG_SERIAL_TXX9_CONSOLE
+
+static void serial_txx9_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_txx9_port *up = to_uart_txx9_port(port);
+
+        wait_for_xmitr(up);
+        sio_out(up, TXX9_SITFIFO, ch);
+}
+
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ *
+ *      The console_lock must be held when we get here.
+ */
+static void
+serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
+{
+        struct uart_txx9_port *up = &serial_txx9_ports[co->index];
+        unsigned int ier, flcr;
+
+        /*
+         *      First save the UER then disable the interrupts
+         */
+        ier = sio_in(up, TXX9_SIDICR);
+        sio_out(up, TXX9_SIDICR, 0);
+        /*
+         *      Disable flow-control if enabled (and unnecessary)
+         */
+        flcr = sio_in(up, TXX9_SIFLCR);
+        if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
+                sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
+
+        uart_console_write(&up->port, s, count, serial_txx9_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the IER
+         */
+        wait_for_xmitr(up);
+        sio_out(up, TXX9_SIFLCR, flcr);
+        sio_out(up, TXX9_SIDICR, ier);
+}
+
+static int __init serial_txx9_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        struct uart_txx9_port *up;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= UART_NR)
+                co->index = 0;
+        up = &serial_txx9_ports[co->index];
+        port = &up->port;
+        if (!port->ops)
+                return -ENODEV;
+
+        serial_txx9_initialize(&up->port);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver serial_txx9_reg;
+static struct console serial_txx9_console = {
+        .name           = TXX9_TTY_NAME,
+        .write          = serial_txx9_console_write,
+        .device         = uart_console_device,
+        .setup          = serial_txx9_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &serial_txx9_reg,
+};
+
+static int __init serial_txx9_console_init(void)
+{
+        register_console(&serial_txx9_console);
+        return 0;
+}
+console_initcall(serial_txx9_console_init);
+
+#define SERIAL_TXX9_CONSOLE     &serial_txx9_console
+#else
+#define SERIAL_TXX9_CONSOLE     NULL
+#endif
+
+static struct uart_driver serial_txx9_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "serial_txx9",
+        .dev_name               = TXX9_TTY_NAME,
+        .major                  = TXX9_TTY_MAJOR,
+        .minor                  = TXX9_TTY_MINOR_START,
+        .nr                     = UART_NR,
+        .cons                   = SERIAL_TXX9_CONSOLE,
+};
+
+int __init early_serial_txx9_setup(struct uart_port *port)
+{
+        if (port->line >= ARRAY_SIZE(serial_txx9_ports))
+                return -ENODEV;
+
+        serial_txx9_ports[port->line].port = *port;
+        serial_txx9_ports[port->line].port.ops = &serial_txx9_pops;
+        serial_txx9_ports[port->line].port.flags |=
+                UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
+        return 0;
+}
+
+static DEFINE_MUTEX(serial_txx9_mutex);
+
+/**
+ *      serial_txx9_register_port - register a serial port
+ *      @port: serial port template
+ *
+ *      Configure the serial port specified by the request.
+ *
+ *      The port is then probed and if necessary the IRQ is autodetected
+ *      If this fails an error is returned.
+ *
+ *      On success the port is ready to use and the line number is returned.
+ */
+static int __devinit serial_txx9_register_port(struct uart_port *port)
+{
+        int i;
+        struct uart_txx9_port *uart;
+        int ret = -ENOSPC;
+
+        mutex_lock(&serial_txx9_mutex);
+        for (i = 0; i < UART_NR; i++) {
+                uart = &serial_txx9_ports[i];
+                if (uart_match_port(&uart->port, port)) {
+                        uart_remove_one_port(&serial_txx9_reg, &uart->port);
+                        break;
+                }
+        }
+        if (i == UART_NR) {
+                /* Find unused port */
+                for (i = 0; i < UART_NR; i++) {
+                        uart = &serial_txx9_ports[i];
+                        if (!(uart->port.iobase || uart->port.mapbase))
+                                break;
+                }
+        }
+        if (i < UART_NR) {
+                uart->port.iobase = port->iobase;
+                uart->port.membase = port->membase;
+                uart->port.irq      = port->irq;
+                uart->port.uartclk  = port->uartclk;
+                uart->port.iotype   = port->iotype;
+                uart->port.flags    = port->flags
+                        | UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
+                uart->port.mapbase  = port->mapbase;
+                if (port->dev)
+                        uart->port.dev = port->dev;
+                ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
+                if (ret == 0)
+                        ret = uart->port.line;
+        }
+        mutex_unlock(&serial_txx9_mutex);
+        return ret;
+}
+
+/**
+ *      serial_txx9_unregister_port - remove a txx9 serial port at runtime
+ *      @line: serial line number
+ *
+ *      Remove one serial port.  This may not be called from interrupt
+ *      context.  We hand the port back to the our control.
+ */
+static void __devexit serial_txx9_unregister_port(int line)
+{
+        struct uart_txx9_port *uart = &serial_txx9_ports[line];
+
+        mutex_lock(&serial_txx9_mutex);
+        uart_remove_one_port(&serial_txx9_reg, &uart->port);
+        uart->port.flags = 0;
+        uart->port.type = PORT_UNKNOWN;
+        uart->port.iobase = 0;
+        uart->port.mapbase = 0;
+        uart->port.membase = NULL;
+        uart->port.dev = NULL;
+        mutex_unlock(&serial_txx9_mutex);
+}
+
+/*
+ * Register a set of serial devices attached to a platform device.
+ */
+static int __devinit serial_txx9_probe(struct platform_device *dev)
+{
+        struct uart_port *p = dev->dev.platform_data;
+        struct uart_port port;
+        int ret, i;
+
+        memset(&port, 0, sizeof(struct uart_port));
+        for (i = 0; p && p->uartclk != 0; p++, i++) {
+                port.iobase     = p->iobase;
+                port.membase    = p->membase;
+                port.irq        = p->irq;
+                port.uartclk    = p->uartclk;
+                port.iotype     = p->iotype;
+                port.flags      = p->flags;
+                port.mapbase    = p->mapbase;
+                port.dev        = &dev->dev;
+                ret = serial_txx9_register_port(&port);
+                if (ret < 0) {
+                        dev_err(&dev->dev, "unable to register port at index %d "
+                                "(IO%lx MEM%llx IRQ%d): %d\n", i,
+                                p->iobase, (unsigned long long)p->mapbase,
+                                p->irq, ret);
+                }
+        }
+        return 0;
+}
+
+/*
+ * Remove serial ports registered against a platform device.
+ */
+static int __devexit serial_txx9_remove(struct platform_device *dev)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_txx9_port *up = &serial_txx9_ports[i];
+
+                if (up->port.dev == &dev->dev)
+                        serial_txx9_unregister_port(i);
+        }
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_txx9_port *up = &serial_txx9_ports[i];
+
+                if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
+                        uart_suspend_port(&serial_txx9_reg, &up->port);
+        }
+
+        return 0;
+}
+
+static int serial_txx9_resume(struct platform_device *dev)
+{
+        int i;
+
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_txx9_port *up = &serial_txx9_ports[i];
+
+                if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
+                        uart_resume_port(&serial_txx9_reg, &up->port);
+        }
+
+        return 0;
+}
+#endif
+
+static struct platform_driver serial_txx9_plat_driver = {
+        .probe          = serial_txx9_probe,
+        .remove         = __devexit_p(serial_txx9_remove),
+#ifdef CONFIG_PM
+        .suspend        = serial_txx9_suspend,
+        .resume         = serial_txx9_resume,
+#endif
+        .driver         = {
+                .name   = "serial_txx9",
+                .owner  = THIS_MODULE,
+        },
+};
+
+#ifdef ENABLE_SERIAL_TXX9_PCI
+/*
+ * Probe one serial board.  Unfortunately, there is no rhyme nor reason
+ * to the arrangement of serial ports on a PCI card.
+ */
+static int __devinit
+pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
+{
+        struct uart_port port;
+        int line;
+        int rc;
+
+        rc = pci_enable_device(dev);
+        if (rc)
+                return rc;
+
+        memset(&port, 0, sizeof(port));
+        port.ops = &serial_txx9_pops;
+        port.flags |= UPF_TXX9_HAVE_CTS_LINE;
+        port.uartclk = 66670000;
+        port.irq = dev->irq;
+        port.iotype = UPIO_PORT;
+        port.iobase = pci_resource_start(dev, 1);
+        port.dev = &dev->dev;
+        line = serial_txx9_register_port(&port);
+        if (line < 0) {
+                printk(KERN_WARNING "Couldn't register serial port %s: %d\n", pci_name(dev), line);
+                pci_disable_device(dev);
+                return line;
+        }
+        pci_set_drvdata(dev, &serial_txx9_ports[line]);
+
+        return 0;
+}
+
+static void __devexit pciserial_txx9_remove_one(struct pci_dev *dev)
+{
+        struct uart_txx9_port *up = pci_get_drvdata(dev);
+
+        pci_set_drvdata(dev, NULL);
+
+        if (up) {
+                serial_txx9_unregister_port(up->port.line);
+                pci_disable_device(dev);
+        }
+}
+
+#ifdef CONFIG_PM
+static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
+{
+        struct uart_txx9_port *up = pci_get_drvdata(dev);
+
+        if (up)
+                uart_suspend_port(&serial_txx9_reg, &up->port);
+        pci_save_state(dev);
+        pci_set_power_state(dev, pci_choose_state(dev, state));
+        return 0;
+}
+
+static int pciserial_txx9_resume_one(struct pci_dev *dev)
+{
+        struct uart_txx9_port *up = pci_get_drvdata(dev);
+
+        pci_set_power_state(dev, PCI_D0);
+        pci_restore_state(dev);
+        if (up)
+                uart_resume_port(&serial_txx9_reg, &up->port);
+        return 0;
+}
+#endif
+
+static const struct pci_device_id serial_txx9_pci_tbl[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_TC86C001_MISC) },
+        { 0, }
+};
+
+static struct pci_driver serial_txx9_pci_driver = {
+        .name           = "serial_txx9",
+        .probe          = pciserial_txx9_init_one,
+        .remove         = __devexit_p(pciserial_txx9_remove_one),
+#ifdef CONFIG_PM
+        .suspend        = pciserial_txx9_suspend_one,
+        .resume         = pciserial_txx9_resume_one,
+#endif
+        .id_table       = serial_txx9_pci_tbl,
+};
+
+MODULE_DEVICE_TABLE(pci, serial_txx9_pci_tbl);
+#endif /* ENABLE_SERIAL_TXX9_PCI */
+
+static struct platform_device *serial_txx9_plat_devs;
+
+static int __init serial_txx9_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
+
+        ret = uart_register_driver(&serial_txx9_reg);
+        if (ret)
+                goto out;
+
+        serial_txx9_plat_devs = platform_device_alloc("serial_txx9", -1);
+        if (!serial_txx9_plat_devs) {
+                ret = -ENOMEM;
+                goto unreg_uart_drv;
+        }
+
+        ret = platform_device_add(serial_txx9_plat_devs);
+        if (ret)
+                goto put_dev;
+
+        serial_txx9_register_ports(&serial_txx9_reg,
+                                   &serial_txx9_plat_devs->dev);
+
+        ret = platform_driver_register(&serial_txx9_plat_driver);
+        if (ret)
+                goto del_dev;
+
+#ifdef ENABLE_SERIAL_TXX9_PCI
+        ret = pci_register_driver(&serial_txx9_pci_driver);
+#endif
+        if (ret == 0)
+                goto out;
+
+ del_dev:
+        platform_device_del(serial_txx9_plat_devs);
+ put_dev:
+        platform_device_put(serial_txx9_plat_devs);
+ unreg_uart_drv:
+        uart_unregister_driver(&serial_txx9_reg);
+ out:
+        return ret;
+}
+
+static void __exit serial_txx9_exit(void)
+{
+        int i;
+
+#ifdef ENABLE_SERIAL_TXX9_PCI
+        pci_unregister_driver(&serial_txx9_pci_driver);
+#endif
+        platform_driver_unregister(&serial_txx9_plat_driver);
+        platform_device_unregister(serial_txx9_plat_devs);
+        for (i = 0; i < UART_NR; i++) {
+                struct uart_txx9_port *up = &serial_txx9_ports[i];
+                if (up->port.iobase || up->port.mapbase)
+                        uart_remove_one_port(&serial_txx9_reg, &up->port);
+        }
+
+        uart_unregister_driver(&serial_txx9_reg);
+}
+
+module_init(serial_txx9_init);
+module_exit(serial_txx9_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("TX39/49 serial driver");
+
+MODULE_ALIAS_CHARDEV_MAJOR(TXX9_TTY_MAJOR);
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
new file mode 100644
index 000000000000..ebd8629c108d
--- /dev/null
+++ b/drivers/tty/serial/sh-sci.c
@@ -0,0 +1,2083 @@
+/*
+ * SuperH on-chip serial module support.  (SCI with no FIFO / with FIFO)
+ *
+ *  Copyright (C) 2002 - 2011  Paul Mundt
+ *  Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007).
+ *
+ * based off of the old drivers/char/sh-sci.c by:
+ *
+ *   Copyright (C) 1999, 2000  Niibe Yutaka
+ *   Copyright (C) 2000  Sugioka Toshinobu
+ *   Modified to support multiple serial ports. Stuart Menefy (May 2000).
+ *   Modified to support SecureEdge. David McCullough (2002)
+ *   Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
+ *   Removed SH7300 support (Jul 2007).
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#undef DEBUG
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/sysrq.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/console.h>
+#include <linux/platform_device.h>
+#include <linux/serial_sci.h>
+#include <linux/notifier.h>
+#include <linux/pm_runtime.h>
+#include <linux/cpufreq.h>
+#include <linux/clk.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/dmaengine.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+
+#ifdef CONFIG_SUPERH
+#include <asm/sh_bios.h>
+#endif
+
+#ifdef CONFIG_H8300
+#include <asm/gpio.h>
+#endif
+
+#include "sh-sci.h"
+
+struct sci_port {
+        struct uart_port        port;
+
+        /* Platform configuration */
+        struct plat_sci_port    *cfg;
+
+        /* Port enable callback */
+        void                    (*enable)(struct uart_port *port);
+
+        /* Port disable callback */
+        void                    (*disable)(struct uart_port *port);
+
+        /* Break timer */
+        struct timer_list       break_timer;
+        int                     break_flag;
+
+        /* Interface clock */
+        struct clk              *iclk;
+        /* Function clock */
+        struct clk              *fclk;
+
+        struct dma_chan                 *chan_tx;
+        struct dma_chan                 *chan_rx;
+
+#ifdef CONFIG_SERIAL_SH_SCI_DMA
+        struct dma_async_tx_descriptor  *desc_tx;
+        struct dma_async_tx_descriptor  *desc_rx[2];
+        dma_cookie_t                    cookie_tx;
+        dma_cookie_t                    cookie_rx[2];
+        dma_cookie_t                    active_rx;
+        struct scatterlist              sg_tx;
+        unsigned int                    sg_len_tx;
+        struct scatterlist              sg_rx[2];
+        size_t                          buf_len_rx;
+        struct sh_dmae_slave            param_tx;
+        struct sh_dmae_slave            param_rx;
+        struct work_struct              work_tx;
+        struct work_struct              work_rx;
+        struct timer_list               rx_timer;
+        unsigned int                    rx_timeout;
+#endif
+
+        struct notifier_block           freq_transition;
+};
+
+/* Function prototypes */
+static void sci_start_tx(struct uart_port *port);
+static void sci_stop_tx(struct uart_port *port);
+static void sci_start_rx(struct uart_port *port);
+
+#define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
+
+static struct sci_port sci_ports[SCI_NPORTS];
+static struct uart_driver sci_uart_driver;
+
+static inline struct sci_port *
+to_sci_port(struct uart_port *uart)
+{
+        return container_of(uart, struct sci_port, port);
+}
+
+#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
+
+#ifdef CONFIG_CONSOLE_POLL
+static int sci_poll_get_char(struct uart_port *port)
+{
+        unsigned short status;
+        int c;
+
+        do {
+                status = sci_in(port, SCxSR);
+                if (status & SCxSR_ERRORS(port)) {
+                        sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
+                        continue;
+                }
+                break;
+        } while (1);
+
+        if (!(status & SCxSR_RDxF(port)))
+                return NO_POLL_CHAR;
+
+        c = sci_in(port, SCxRDR);
+
+        /* Dummy read */
+        sci_in(port, SCxSR);
+        sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
+
+        return c;
+}
+#endif
+
+static void sci_poll_put_char(struct uart_port *port, unsigned char c)
+{
+        unsigned short status;
+
+        do {
+                status = sci_in(port, SCxSR);
+        } while (!(status & SCxSR_TDxE(port)));
+
+        sci_out(port, SCxTDR, c);
+        sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port));
+}
+#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
+
+#if defined(__H8300H__) || defined(__H8300S__)
+static void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        int ch = (port->mapbase - SMR0) >> 3;
+
+        /* set DDR regs */
+        H8300_GPIO_DDR(h8300_sci_pins[ch].port,
+                       h8300_sci_pins[ch].rx,
+                       H8300_GPIO_INPUT);
+        H8300_GPIO_DDR(h8300_sci_pins[ch].port,
+                       h8300_sci_pins[ch].tx,
+                       H8300_GPIO_OUTPUT);
+
+        /* tx mark output*/
+        H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
+}
+#elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
+static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        if (port->mapbase == 0xA4400000) {
+                __raw_writew(__raw_readw(PACR) & 0xffc0, PACR);
+                __raw_writew(__raw_readw(PBCR) & 0x0fff, PBCR);
+        } else if (port->mapbase == 0xA4410000)
+                __raw_writew(__raw_readw(PBCR) & 0xf003, PBCR);
+}
+#elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
+static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        unsigned short data;
+
+        if (cflag & CRTSCTS) {
+                /* enable RTS/CTS */
+                if (port->mapbase == 0xa4430000) { /* SCIF0 */
+                        /* Clear PTCR bit 9-2; enable all scif pins but sck */
+                        data = __raw_readw(PORT_PTCR);
+                        __raw_writew((data & 0xfc03), PORT_PTCR);
+                } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
+                        /* Clear PVCR bit 9-2 */
+                        data = __raw_readw(PORT_PVCR);
+                        __raw_writew((data & 0xfc03), PORT_PVCR);
+                }
+        } else {
+                if (port->mapbase == 0xa4430000) { /* SCIF0 */
+                        /* Clear PTCR bit 5-2; enable only tx and rx  */
+                        data = __raw_readw(PORT_PTCR);
+                        __raw_writew((data & 0xffc3), PORT_PTCR);
+                } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
+                        /* Clear PVCR bit 5-2 */
+                        data = __raw_readw(PORT_PVCR);
+                        __raw_writew((data & 0xffc3), PORT_PVCR);
+                }
+        }
+}
+#elif defined(CONFIG_CPU_SH3)
+/* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
+static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        unsigned short data;
+
+        /* We need to set SCPCR to enable RTS/CTS */
+        data = __raw_readw(SCPCR);
+        /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
+        __raw_writew(data & 0x0fcf, SCPCR);
+
+        if (!(cflag & CRTSCTS)) {
+                /* We need to set SCPCR to enable RTS/CTS */
+                data = __raw_readw(SCPCR);
+                /* Clear out SCP7MD1,0, SCP4MD1,0,
+                   Set SCP6MD1,0 = {01} (output)  */
+                __raw_writew((data & 0x0fcf) | 0x1000, SCPCR);
+
+                data = __raw_readb(SCPDR);
+                /* Set /RTS2 (bit6) = 0 */
+                __raw_writeb(data & 0xbf, SCPDR);
+        }
+}
+#elif defined(CONFIG_CPU_SUBTYPE_SH7722)
+static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        unsigned short data;
+
+        if (port->mapbase == 0xffe00000) {
+                data = __raw_readw(PSCR);
+                data &= ~0x03cf;
+                if (!(cflag & CRTSCTS))
+                        data |= 0x0340;
+
+                __raw_writew(data, PSCR);
+        }
+}
+#elif defined(CONFIG_CPU_SUBTYPE_SH7757) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7763) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7780) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7785) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7786) || \
+      defined(CONFIG_CPU_SUBTYPE_SHX3)
+static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        if (!(cflag & CRTSCTS))
+                __raw_writew(0x0080, SCSPTR0); /* Set RTS = 1 */
+}
+#elif defined(CONFIG_CPU_SH4) && !defined(CONFIG_CPU_SH4A)
+static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        if (!(cflag & CRTSCTS))
+                __raw_writew(0x0080, SCSPTR2); /* Set RTS = 1 */
+}
+#else
+static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+        /* Nothing to do */
+}
+#endif
+
+#if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7780) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7785) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7786)
+static int scif_txfill(struct uart_port *port)
+{
+        return sci_in(port, SCTFDR) & 0xff;
+}
+
+static int scif_txroom(struct uart_port *port)
+{
+        return SCIF_TXROOM_MAX - scif_txfill(port);
+}
+
+static int scif_rxfill(struct uart_port *port)
+{
+        return sci_in(port, SCRFDR) & 0xff;
+}
+#elif defined(CONFIG_CPU_SUBTYPE_SH7763)
+static int scif_txfill(struct uart_port *port)
+{
+        if (port->mapbase == 0xffe00000 ||
+            port->mapbase == 0xffe08000)
+                /* SCIF0/1*/
+                return sci_in(port, SCTFDR) & 0xff;
+        else
+                /* SCIF2 */
+                return sci_in(port, SCFDR) >> 8;
+}
+
+static int scif_txroom(struct uart_port *port)
+{
+        if (port->mapbase == 0xffe00000 ||
+            port->mapbase == 0xffe08000)
+                /* SCIF0/1*/
+                return SCIF_TXROOM_MAX - scif_txfill(port);
+        else
+                /* SCIF2 */
+                return SCIF2_TXROOM_MAX - scif_txfill(port);
+}
+
+static int scif_rxfill(struct uart_port *port)
+{
+        if ((port->mapbase == 0xffe00000) ||
+            (port->mapbase == 0xffe08000)) {
+                /* SCIF0/1*/
+                return sci_in(port, SCRFDR) & 0xff;
+        } else {
+                /* SCIF2 */
+                return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
+        }
+}
+#elif defined(CONFIG_ARCH_SH7372)
+static int scif_txfill(struct uart_port *port)
+{
+        if (port->type == PORT_SCIFA)
+                return sci_in(port, SCFDR) >> 8;
+        else
+                return sci_in(port, SCTFDR);
+}
+
+static int scif_txroom(struct uart_port *port)
+{
+        return port->fifosize - scif_txfill(port);
+}
+
+static int scif_rxfill(struct uart_port *port)
+{
+        if (port->type == PORT_SCIFA)
+                return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
+        else
+                return sci_in(port, SCRFDR);
+}
+#else
+static int scif_txfill(struct uart_port *port)
+{
+        return sci_in(port, SCFDR) >> 8;
+}
+
+static int scif_txroom(struct uart_port *port)
+{
+        return SCIF_TXROOM_MAX - scif_txfill(port);
+}
+
+static int scif_rxfill(struct uart_port *port)
+{
+        return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
+}
+#endif
+
+static int sci_txfill(struct uart_port *port)
+{
+        return !(sci_in(port, SCxSR) & SCI_TDRE);
+}
+
+static int sci_txroom(struct uart_port *port)
+{
+        return !sci_txfill(port);
+}
+
+static int sci_rxfill(struct uart_port *port)
+{
+        return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0;
+}
+
+/* ********************************************************************** *
+ *                   the interrupt related routines                       *
+ * ********************************************************************** */
+
+static void sci_transmit_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+        unsigned int stopped = uart_tx_stopped(port);
+        unsigned short status;
+        unsigned short ctrl;
+        int count;
+
+        status = sci_in(port, SCxSR);
+        if (!(status & SCxSR_TDxE(port))) {
+                ctrl = sci_in(port, SCSCR);
+                if (uart_circ_empty(xmit))
+                        ctrl &= ~SCSCR_TIE;
+                else
+                        ctrl |= SCSCR_TIE;
+                sci_out(port, SCSCR, ctrl);
+                return;
+        }
+
+        if (port->type == PORT_SCI)
+                count = sci_txroom(port);
+        else
+                count = scif_txroom(port);
+
+        do {
+                unsigned char c;
+
+                if (port->x_char) {
+                        c = port->x_char;
+                        port->x_char = 0;
+                } else if (!uart_circ_empty(xmit) && !stopped) {
+                        c = xmit->buf[xmit->tail];
+                        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                } else {
+                        break;
+                }
+
+                sci_out(port, SCxTDR, c);
+
+                port->icount.tx++;
+        } while (--count > 0);
+
+        sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+        if (uart_circ_empty(xmit)) {
+                sci_stop_tx(port);
+        } else {
+                ctrl = sci_in(port, SCSCR);
+
+                if (port->type != PORT_SCI) {
+                        sci_in(port, SCxSR); /* Dummy read */
+                        sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
+                }
+
+                ctrl |= SCSCR_TIE;
+                sci_out(port, SCSCR, ctrl);
+        }
+}
+
+/* On SH3, SCIF may read end-of-break as a space->mark char */
+#define STEPFN(c)  ({int __c = (c); (((__c-1)|(__c)) == -1); })
+
+static void sci_receive_chars(struct uart_port *port)
+{
+        struct sci_port *sci_port = to_sci_port(port);
+        struct tty_struct *tty = port->state->port.tty;
+        int i, count, copied = 0;
+        unsigned short status;
+        unsigned char flag;
+
+        status = sci_in(port, SCxSR);
+        if (!(status & SCxSR_RDxF(port)))
+                return;
+
+        while (1) {
+                if (port->type == PORT_SCI)
+                        count = sci_rxfill(port);
+                else
+                        count = scif_rxfill(port);
+
+                /* Don't copy more bytes than there is room for in the buffer */
+                count = tty_buffer_request_room(tty, count);
+
+                /* If for any reason we can't copy more data, we're done! */
+                if (count == 0)
+                        break;
+
+                if (port->type == PORT_SCI) {
+                        char c = sci_in(port, SCxRDR);
+                        if (uart_handle_sysrq_char(port, c) ||
+                            sci_port->break_flag)
+                                count = 0;
+                        else
+                                tty_insert_flip_char(tty, c, TTY_NORMAL);
+                } else {
+                        for (i = 0; i < count; i++) {
+                                char c = sci_in(port, SCxRDR);
+                                status = sci_in(port, SCxSR);
+#if defined(CONFIG_CPU_SH3)
+                                /* Skip "chars" during break */
+                                if (sci_port->break_flag) {
+                                        if ((c == 0) &&
+                                            (status & SCxSR_FER(port))) {
+                                                count--; i--;
+                                                continue;
+                                        }
+
+                                        /* Nonzero => end-of-break */
+                                        dev_dbg(port->dev, "debounce<%02x>\n", c);
+                                        sci_port->break_flag = 0;
+
+                                        if (STEPFN(c)) {
+                                                count--; i--;
+                                                continue;
+                                        }
+                                }
+#endif /* CONFIG_CPU_SH3 */
+                                if (uart_handle_sysrq_char(port, c)) {
+                                        count--; i--;
+                                        continue;
+                                }
+
+                                /* Store data and status */
+                                if (status & SCxSR_FER(port)) {
+                                        flag = TTY_FRAME;
+                                        dev_notice(port->dev, "frame error\n");
+                                } else if (status & SCxSR_PER(port)) {
+                                        flag = TTY_PARITY;
+                                        dev_notice(port->dev, "parity error\n");
+                                } else
+                                        flag = TTY_NORMAL;
+
+                                tty_insert_flip_char(tty, c, flag);
+                        }
+                }
+
+                sci_in(port, SCxSR); /* dummy read */
+                sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
+
+                copied += count;
+                port->icount.rx += count;
+        }
+
+        if (copied) {
+                /* Tell the rest of the system the news. New characters! */
+                tty_flip_buffer_push(tty);
+        } else {
+                sci_in(port, SCxSR); /* dummy read */
+                sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
+        }
+}
+
+#define SCI_BREAK_JIFFIES (HZ/20)
+
+/*
+ * The sci generates interrupts during the break,
+ * 1 per millisecond or so during the break period, for 9600 baud.
+ * So dont bother disabling interrupts.
+ * But dont want more than 1 break event.
+ * Use a kernel timer to periodically poll the rx line until
+ * the break is finished.
+ */
+static inline void sci_schedule_break_timer(struct sci_port *port)
+{
+        mod_timer(&port->break_timer, jiffies + SCI_BREAK_JIFFIES);
+}
+
+/* Ensure that two consecutive samples find the break over. */
+static void sci_break_timer(unsigned long data)
+{
+        struct sci_port *port = (struct sci_port *)data;
+
+        if (port->enable)
+                port->enable(&port->port);
+
+        if (sci_rxd_in(&port->port) == 0) {
+                port->break_flag = 1;
+                sci_schedule_break_timer(port);
+        } else if (port->break_flag == 1) {
+                /* break is over. */
+                port->break_flag = 2;
+                sci_schedule_break_timer(port);
+        } else
+                port->break_flag = 0;
+
+        if (port->disable)
+                port->disable(&port->port);
+}
+
+static int sci_handle_errors(struct uart_port *port)
+{
+        int copied = 0;
+        unsigned short status = sci_in(port, SCxSR);
+        struct tty_struct *tty = port->state->port.tty;
+
+        if (status & SCxSR_ORER(port)) {
+                /* overrun error */
+                if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
+                        copied++;
+
+                dev_notice(port->dev, "overrun error");
+        }
+
+        if (status & SCxSR_FER(port)) {
+                if (sci_rxd_in(port) == 0) {
+                        /* Notify of BREAK */
+                        struct sci_port *sci_port = to_sci_port(port);
+
+                        if (!sci_port->break_flag) {
+                                sci_port->break_flag = 1;
+                                sci_schedule_break_timer(sci_port);
+
+                                /* Do sysrq handling. */
+                                if (uart_handle_break(port))
+                                        return 0;
+
+                                dev_dbg(port->dev, "BREAK detected\n");
+
+                                if (tty_insert_flip_char(tty, 0, TTY_BREAK))
+                                        copied++;
+                        }
+
+                } else {
+                        /* frame error */
+                        if (tty_insert_flip_char(tty, 0, TTY_FRAME))
+                                copied++;
+
+                        dev_notice(port->dev, "frame error\n");
+                }
+        }
+
+        if (status & SCxSR_PER(port)) {
+                /* parity error */
+                if (tty_insert_flip_char(tty, 0, TTY_PARITY))
+                        copied++;
+
+                dev_notice(port->dev, "parity error");
+        }
+
+        if (copied)
+                tty_flip_buffer_push(tty);
+
+        return copied;
+}
+
+static int sci_handle_fifo_overrun(struct uart_port *port)
+{
+        struct tty_struct *tty = port->state->port.tty;
+        int copied = 0;
+
+        if (port->type != PORT_SCIF)
+                return 0;
+
+        if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
+                sci_out(port, SCLSR, 0);
+
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                tty_flip_buffer_push(tty);
+
+                dev_notice(port->dev, "overrun error\n");
+                copied++;
+        }
+
+        return copied;
+}
+
+static int sci_handle_breaks(struct uart_port *port)
+{
+        int copied = 0;
+        unsigned short status = sci_in(port, SCxSR);
+        struct tty_struct *tty = port->state->port.tty;
+        struct sci_port *s = to_sci_port(port);
+
+        if (uart_handle_break(port))
+                return 0;
+
+        if (!s->break_flag && status & SCxSR_BRK(port)) {
+#if defined(CONFIG_CPU_SH3)
+                /* Debounce break */
+                s->break_flag = 1;
+#endif
+                /* Notify of BREAK */
+                if (tty_insert_flip_char(tty, 0, TTY_BREAK))
+                        copied++;
+
+                dev_dbg(port->dev, "BREAK detected\n");
+        }
+
+        if (copied)
+                tty_flip_buffer_push(tty);
+
+        copied += sci_handle_fifo_overrun(port);
+
+        return copied;
+}
+
+static irqreturn_t sci_rx_interrupt(int irq, void *ptr)
+{
+#ifdef CONFIG_SERIAL_SH_SCI_DMA
+        struct uart_port *port = ptr;
+        struct sci_port *s = to_sci_port(port);
+
+        if (s->chan_rx) {
+                u16 scr = sci_in(port, SCSCR);
+                u16 ssr = sci_in(port, SCxSR);
+
+                /* Disable future Rx interrupts */
+                if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+                        disable_irq_nosync(irq);
+                        scr |= 0x4000;
+                } else {
+                        scr &= ~SCSCR_RIE;
+                }
+                sci_out(port, SCSCR, scr);
+                /* Clear current interrupt */
+                sci_out(port, SCxSR, ssr & ~(1 | SCxSR_RDxF(port)));
+                dev_dbg(port->dev, "Rx IRQ %lu: setup t-out in %u jiffies\n",
+                        jiffies, s->rx_timeout);
+                mod_timer(&s->rx_timer, jiffies + s->rx_timeout);
+
+                return IRQ_HANDLED;
+        }
+#endif
+
+        /* I think sci_receive_chars has to be called irrespective
+         * of whether the I_IXOFF is set, otherwise, how is the interrupt
+         * to be disabled?
+         */
+        sci_receive_chars(ptr);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
+{
+        struct uart_port *port = ptr;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        sci_transmit_chars(port);
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t sci_er_interrupt(int irq, void *ptr)
+{
+        struct uart_port *port = ptr;
+
+        /* Handle errors */
+        if (port->type == PORT_SCI) {
+                if (sci_handle_errors(port)) {
+                        /* discard character in rx buffer */
+                        sci_in(port, SCxSR);
+                        sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
+                }
+        } else {
+                sci_handle_fifo_overrun(port);
+                sci_rx_interrupt(irq, ptr);
+        }
+
+        sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
+
+        /* Kick the transmission */
+        sci_tx_interrupt(irq, ptr);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t sci_br_interrupt(int irq, void *ptr)
+{
+        struct uart_port *port = ptr;
+
+        /* Handle BREAKs */
+        sci_handle_breaks(port);
+        sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
+
+        return IRQ_HANDLED;
+}
+
+static inline unsigned long port_rx_irq_mask(struct uart_port *port)
+{
+        /*
+         * Not all ports (such as SCIFA) will support REIE. Rather than
+         * special-casing the port type, we check the port initialization
+         * IRQ enable mask to see whether the IRQ is desired at all. If
+         * it's unset, it's logically inferred that there's no point in
+         * testing for it.
+         */
+        return SCSCR_RIE | (to_sci_port(port)->cfg->scscr & SCSCR_REIE);
+}
+
+static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
+{
+        unsigned short ssr_status, scr_status, err_enabled;
+        struct uart_port *port = ptr;
+        struct sci_port *s = to_sci_port(port);
+        irqreturn_t ret = IRQ_NONE;
+
+        ssr_status = sci_in(port, SCxSR);
+        scr_status = sci_in(port, SCSCR);
+        err_enabled = scr_status & port_rx_irq_mask(port);
+
+        /* Tx Interrupt */
+        if ((ssr_status & SCxSR_TDxE(port)) && (scr_status & SCSCR_TIE) &&
+            !s->chan_tx)
+                ret = sci_tx_interrupt(irq, ptr);
+
+        /*
+         * Rx Interrupt: if we're using DMA, the DMA controller clears RDF /
+         * DR flags
+         */
+        if (((ssr_status & SCxSR_RDxF(port)) || s->chan_rx) &&
+            (scr_status & SCSCR_RIE))
+                ret = sci_rx_interrupt(irq, ptr);
+
+        /* Error Interrupt */
+        if ((ssr_status & SCxSR_ERRORS(port)) && err_enabled)
+                ret = sci_er_interrupt(irq, ptr);
+
+        /* Break Interrupt */
+        if ((ssr_status & SCxSR_BRK(port)) && err_enabled)
+                ret = sci_br_interrupt(irq, ptr);
+
+        return ret;
+}
+
+/*
+ * Here we define a transition notifier so that we can update all of our
+ * ports' baud rate when the peripheral clock changes.
+ */
+static int sci_notifier(struct notifier_block *self,
+                        unsigned long phase, void *p)
+{
+        struct sci_port *sci_port;
+        unsigned long flags;
+
+        sci_port = container_of(self, struct sci_port, freq_transition);
+
+        if ((phase == CPUFREQ_POSTCHANGE) ||
+            (phase == CPUFREQ_RESUMECHANGE)) {
+                struct uart_port *port = &sci_port->port;
+
+                spin_lock_irqsave(&port->lock, flags);
+                port->uartclk = clk_get_rate(sci_port->iclk);
+                spin_unlock_irqrestore(&port->lock, flags);
+        }
+
+        return NOTIFY_OK;
+}
+
+static void sci_clk_enable(struct uart_port *port)
+{
+        struct sci_port *sci_port = to_sci_port(port);
+
+        pm_runtime_get_sync(port->dev);
+
+        clk_enable(sci_port->iclk);
+        sci_port->port.uartclk = clk_get_rate(sci_port->iclk);
+        clk_enable(sci_port->fclk);
+}
+
+static void sci_clk_disable(struct uart_port *port)
+{
+        struct sci_port *sci_port = to_sci_port(port);
+
+        clk_disable(sci_port->fclk);
+        clk_disable(sci_port->iclk);
+
+        pm_runtime_put_sync(port->dev);
+}
+
+static int sci_request_irq(struct sci_port *port)
+{
+        int i;
+        irqreturn_t (*handlers[4])(int irq, void *ptr) = {
+                sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
+                sci_br_interrupt,
+        };
+        const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
+                               "SCI Transmit Data Empty", "SCI Break" };
+
+        if (port->cfg->irqs[0] == port->cfg->irqs[1]) {
+                if (unlikely(!port->cfg->irqs[0]))
+                        return -ENODEV;
+
+                if (request_irq(port->cfg->irqs[0], sci_mpxed_interrupt,
+                                IRQF_DISABLED, "sci", port)) {
+                        dev_err(port->port.dev, "Can't allocate IRQ\n");
+                        return -ENODEV;
+                }
+        } else {
+                for (i = 0; i < ARRAY_SIZE(handlers); i++) {
+                        if (unlikely(!port->cfg->irqs[i]))
+                                continue;
+
+                        if (request_irq(port->cfg->irqs[i], handlers[i],
+                                        IRQF_DISABLED, desc[i], port)) {
+                                dev_err(port->port.dev, "Can't allocate IRQ\n");
+                                return -ENODEV;
+                        }
+                }
+        }
+
+        return 0;
+}
+
+static void sci_free_irq(struct sci_port *port)
+{
+        int i;
+
+        if (port->cfg->irqs[0] == port->cfg->irqs[1])
+                free_irq(port->cfg->irqs[0], port);
+        else {
+                for (i = 0; i < ARRAY_SIZE(port->cfg->irqs); i++) {
+                        if (!port->cfg->irqs[i])
+                                continue;
+
+                        free_irq(port->cfg->irqs[i], port);
+                }
+        }
+}
+
+static unsigned int sci_tx_empty(struct uart_port *port)
+{
+        unsigned short status = sci_in(port, SCxSR);
+        unsigned short in_tx_fifo = scif_txfill(port);
+
+        return (status & SCxSR_TEND(port)) && !in_tx_fifo ? TIOCSER_TEMT : 0;
+}
+
+static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
+        /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
+        /* If you have signals for DTR and DCD, please implement here. */
+}
+
+static unsigned int sci_get_mctrl(struct uart_port *port)
+{
+        /* This routine is used for getting signals of: DTR, DCD, DSR, RI,
+           and CTS/RTS */
+
+        return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
+}
+
+#ifdef CONFIG_SERIAL_SH_SCI_DMA
+static void sci_dma_tx_complete(void *arg)
+{
+        struct sci_port *s = arg;
+        struct uart_port *port = &s->port;
+        struct circ_buf *xmit = &port->state->xmit;
+        unsigned long flags;
+
+        dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        xmit->tail += sg_dma_len(&s->sg_tx);
+        xmit->tail &= UART_XMIT_SIZE - 1;
+
+        port->icount.tx += sg_dma_len(&s->sg_tx);
+
+        async_tx_ack(s->desc_tx);
+        s->cookie_tx = -EINVAL;
+        s->desc_tx = NULL;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (!uart_circ_empty(xmit)) {
+                schedule_work(&s->work_tx);
+        } else if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+                u16 ctrl = sci_in(port, SCSCR);
+                sci_out(port, SCSCR, ctrl & ~SCSCR_TIE);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/* Locking: called with port lock held */
+static int sci_dma_rx_push(struct sci_port *s, struct tty_struct *tty,
+                           size_t count)
+{
+        struct uart_port *port = &s->port;
+        int i, active, room;
+
+        room = tty_buffer_request_room(tty, count);
+
+        if (s->active_rx == s->cookie_rx[0]) {
+                active = 0;
+        } else if (s->active_rx == s->cookie_rx[1]) {
+                active = 1;
+        } else {
+                dev_err(port->dev, "cookie %d not found!\n", s->active_rx);
+                return 0;
+        }
+
+        if (room < count)
+                dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
+                         count - room);
+        if (!room)
+                return room;
+
+        for (i = 0; i < room; i++)
+                tty_insert_flip_char(tty, ((u8 *)sg_virt(&s->sg_rx[active]))[i],
+                                     TTY_NORMAL);
+
+        port->icount.rx += room;
+
+        return room;
+}
+
+static void sci_dma_rx_complete(void *arg)
+{
+        struct sci_port *s = arg;
+        struct uart_port *port = &s->port;
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned long flags;
+        int count;
+
+        dev_dbg(port->dev, "%s(%d) active #%d\n", __func__, port->line, s->active_rx);
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        count = sci_dma_rx_push(s, tty, s->buf_len_rx);
+
+        mod_timer(&s->rx_timer, jiffies + s->rx_timeout);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        if (count)
+                tty_flip_buffer_push(tty);
+
+        schedule_work(&s->work_rx);
+}
+
+static void sci_rx_dma_release(struct sci_port *s, bool enable_pio)
+{
+        struct dma_chan *chan = s->chan_rx;
+        struct uart_port *port = &s->port;
+
+        s->chan_rx = NULL;
+        s->cookie_rx[0] = s->cookie_rx[1] = -EINVAL;
+        dma_release_channel(chan);
+        if (sg_dma_address(&s->sg_rx[0]))
+                dma_free_coherent(port->dev, s->buf_len_rx * 2,
+                                  sg_virt(&s->sg_rx[0]), sg_dma_address(&s->sg_rx[0]));
+        if (enable_pio)
+                sci_start_rx(port);
+}
+
+static void sci_tx_dma_release(struct sci_port *s, bool enable_pio)
+{
+        struct dma_chan *chan = s->chan_tx;
+        struct uart_port *port = &s->port;
+
+        s->chan_tx = NULL;
+        s->cookie_tx = -EINVAL;
+        dma_release_channel(chan);
+        if (enable_pio)
+                sci_start_tx(port);
+}
+
+static void sci_submit_rx(struct sci_port *s)
+{
+        struct dma_chan *chan = s->chan_rx;
+        int i;
+
+        for (i = 0; i < 2; i++) {
+                struct scatterlist *sg = &s->sg_rx[i];
+                struct dma_async_tx_descriptor *desc;
+
+                desc = chan->device->device_prep_slave_sg(chan,
+                        sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT);
+
+                if (desc) {
+                        s->desc_rx[i] = desc;
+                        desc->callback = sci_dma_rx_complete;
+                        desc->callback_param = s;
+                        s->cookie_rx[i] = desc->tx_submit(desc);
+                }
+
+                if (!desc || s->cookie_rx[i] < 0) {
+                        if (i) {
+                                async_tx_ack(s->desc_rx[0]);
+                                s->cookie_rx[0] = -EINVAL;
+                        }
+                        if (desc) {
+                                async_tx_ack(desc);
+                                s->cookie_rx[i] = -EINVAL;
+                        }
+                        dev_warn(s->port.dev,
+                                 "failed to re-start DMA, using PIO\n");
+                        sci_rx_dma_release(s, true);
+                        return;
+                }
+                dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", __func__,
+                        s->cookie_rx[i], i);
+        }
+
+        s->active_rx = s->cookie_rx[0];
+
+        dma_async_issue_pending(chan);
+}
+
+static void work_fn_rx(struct work_struct *work)
+{
+        struct sci_port *s = container_of(work, struct sci_port, work_rx);
+        struct uart_port *port = &s->port;
+        struct dma_async_tx_descriptor *desc;
+        int new;
+
+        if (s->active_rx == s->cookie_rx[0]) {
+                new = 0;
+        } else if (s->active_rx == s->cookie_rx[1]) {
+                new = 1;
+        } else {
+                dev_err(port->dev, "cookie %d not found!\n", s->active_rx);
+                return;
+        }
+        desc = s->desc_rx[new];
+
+        if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) !=
+            DMA_SUCCESS) {
+                /* Handle incomplete DMA receive */
+                struct tty_struct *tty = port->state->port.tty;
+                struct dma_chan *chan = s->chan_rx;
+                struct sh_desc *sh_desc = container_of(desc, struct sh_desc,
+                                                       async_tx);
+                unsigned long flags;
+                int count;
+
+                chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
+                dev_dbg(port->dev, "Read %u bytes with cookie %d\n",
+                        sh_desc->partial, sh_desc->cookie);
+
+                spin_lock_irqsave(&port->lock, flags);
+                count = sci_dma_rx_push(s, tty, sh_desc->partial);
+                spin_unlock_irqrestore(&port->lock, flags);
+
+                if (count)
+                        tty_flip_buffer_push(tty);
+
+                sci_submit_rx(s);
+
+                return;
+        }
+
+        s->cookie_rx[new] = desc->tx_submit(desc);
+        if (s->cookie_rx[new] < 0) {
+                dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n");
+                sci_rx_dma_release(s, true);
+                return;
+        }
+
+        s->active_rx = s->cookie_rx[!new];
+
+        dev_dbg(port->dev, "%s: cookie %d #%d, new active #%d\n", __func__,
+                s->cookie_rx[new], new, s->active_rx);
+}
+
+static void work_fn_tx(struct work_struct *work)
+{
+        struct sci_port *s = container_of(work, struct sci_port, work_tx);
+        struct dma_async_tx_descriptor *desc;
+        struct dma_chan *chan = s->chan_tx;
+        struct uart_port *port = &s->port;
+        struct circ_buf *xmit = &port->state->xmit;
+        struct scatterlist *sg = &s->sg_tx;
+
+        /*
+         * DMA is idle now.
+         * Port xmit buffer is already mapped, and it is one page... Just adjust
+         * offsets and lengths. Since it is a circular buffer, we have to
+         * transmit till the end, and then the rest. Take the port lock to get a
+         * consistent xmit buffer state.
+         */
+        spin_lock_irq(&port->lock);
+        sg->offset = xmit->tail & (UART_XMIT_SIZE - 1);
+        sg_dma_address(sg) = (sg_dma_address(sg) & ~(UART_XMIT_SIZE - 1)) +
+                sg->offset;
+        sg_dma_len(sg) = min((int)CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE),
+                CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE));
+        spin_unlock_irq(&port->lock);
+
+        BUG_ON(!sg_dma_len(sg));
+
+        desc = chan->device->device_prep_slave_sg(chan,
+                        sg, s->sg_len_tx, DMA_TO_DEVICE,
+                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+        if (!desc) {
+                /* switch to PIO */
+                sci_tx_dma_release(s, true);
+                return;
+        }
+
+        dma_sync_sg_for_device(port->dev, sg, 1, DMA_TO_DEVICE);
+
+        spin_lock_irq(&port->lock);
+        s->desc_tx = desc;
+        desc->callback = sci_dma_tx_complete;
+        desc->callback_param = s;
+        spin_unlock_irq(&port->lock);
+        s->cookie_tx = desc->tx_submit(desc);
+        if (s->cookie_tx < 0) {
+                dev_warn(port->dev, "Failed submitting Tx DMA descriptor\n");
+                /* switch to PIO */
+                sci_tx_dma_release(s, true);
+                return;
+        }
+
+        dev_dbg(port->dev, "%s: %p: %d...%d, cookie %d\n", __func__,
+                xmit->buf, xmit->tail, xmit->head, s->cookie_tx);
+
+        dma_async_issue_pending(chan);
+}
+#endif
+
+static void sci_start_tx(struct uart_port *port)
+{
+        struct sci_port *s = to_sci_port(port);
+        unsigned short ctrl;
+
+#ifdef CONFIG_SERIAL_SH_SCI_DMA
+        if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+                u16 new, scr = sci_in(port, SCSCR);
+                if (s->chan_tx)
+                        new = scr | 0x8000;
+                else
+                        new = scr & ~0x8000;
+                if (new != scr)
+                        sci_out(port, SCSCR, new);
+        }
+
+        if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) &&
+            s->cookie_tx < 0)
+                schedule_work(&s->work_tx);
+#endif
+
+        if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+                /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
+                ctrl = sci_in(port, SCSCR);
+                sci_out(port, SCSCR, ctrl | SCSCR_TIE);
+        }
+}
+
+static void sci_stop_tx(struct uart_port *port)
+{
+        unsigned short ctrl;
+
+        /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
+        ctrl = sci_in(port, SCSCR);
+
+        if (port->type == PORT_SCIFA || port->type == PORT_SCIFB)
+                ctrl &= ~0x8000;
+
+        ctrl &= ~SCSCR_TIE;
+
+        sci_out(port, SCSCR, ctrl);
+}
+
+static void sci_start_rx(struct uart_port *port)
+{
+        unsigned short ctrl;
+
+        ctrl = sci_in(port, SCSCR) | port_rx_irq_mask(port);
+
+        if (port->type == PORT_SCIFA || port->type == PORT_SCIFB)
+                ctrl &= ~0x4000;
+
+        sci_out(port, SCSCR, ctrl);
+}
+
+static void sci_stop_rx(struct uart_port *port)
+{
+        unsigned short ctrl;
+
+        ctrl = sci_in(port, SCSCR);
+
+        if (port->type == PORT_SCIFA || port->type == PORT_SCIFB)
+                ctrl &= ~0x4000;
+
+        ctrl &= ~port_rx_irq_mask(port);
+
+        sci_out(port, SCSCR, ctrl);
+}
+
+static void sci_enable_ms(struct uart_port *port)
+{
+        /* Nothing here yet .. */
+}
+
+static void sci_break_ctl(struct uart_port *port, int break_state)
+{
+        /* Nothing here yet .. */
+}
+
+#ifdef CONFIG_SERIAL_SH_SCI_DMA
+static bool filter(struct dma_chan *chan, void *slave)
+{
+        struct sh_dmae_slave *param = slave;
+
+        dev_dbg(chan->device->dev, "%s: slave ID %d\n", __func__,
+                param->slave_id);
+
+        if (param->dma_dev == chan->device->dev) {
+                chan->private = param;
+                return true;
+        } else {
+                return false;
+        }
+}
+
+static void rx_timer_fn(unsigned long arg)
+{
+        struct sci_port *s = (struct sci_port *)arg;
+        struct uart_port *port = &s->port;
+        u16 scr = sci_in(port, SCSCR);
+
+        if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+                scr &= ~0x4000;
+                enable_irq(s->cfg->irqs[1]);
+        }
+        sci_out(port, SCSCR, scr | SCSCR_RIE);
+        dev_dbg(port->dev, "DMA Rx timed out\n");
+        schedule_work(&s->work_rx);
+}
+
+static void sci_request_dma(struct uart_port *port)
+{
+        struct sci_port *s = to_sci_port(port);
+        struct sh_dmae_slave *param;
+        struct dma_chan *chan;
+        dma_cap_mask_t mask;
+        int nent;
+
+        dev_dbg(port->dev, "%s: port %d DMA %p\n", __func__,
+                port->line, s->cfg->dma_dev);
+
+        if (!s->cfg->dma_dev)
+                return;
+
+        dma_cap_zero(mask);
+        dma_cap_set(DMA_SLAVE, mask);
+
+        param = &s->param_tx;
+
+        /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */
+        param->slave_id = s->cfg->dma_slave_tx;
+        param->dma_dev = s->cfg->dma_dev;
+
+        s->cookie_tx = -EINVAL;
+        chan = dma_request_channel(mask, filter, param);
+        dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan);
+        if (chan) {
+                s->chan_tx = chan;
+                sg_init_table(&s->sg_tx, 1);
+                /* UART circular tx buffer is an aligned page. */
+                BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK);
+                sg_set_page(&s->sg_tx, virt_to_page(port->state->xmit.buf),
+                            UART_XMIT_SIZE, (int)port->state->xmit.buf & ~PAGE_MASK);
+                nent = dma_map_sg(port->dev, &s->sg_tx, 1, DMA_TO_DEVICE);
+                if (!nent)
+                        sci_tx_dma_release(s, false);
+                else
+                        dev_dbg(port->dev, "%s: mapped %d@%p to %x\n", __func__,
+                                sg_dma_len(&s->sg_tx),
+                                port->state->xmit.buf, sg_dma_address(&s->sg_tx));
+
+                s->sg_len_tx = nent;
+
+                INIT_WORK(&s->work_tx, work_fn_tx);
+        }
+
+        param = &s->param_rx;
+
+        /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */
+        param->slave_id = s->cfg->dma_slave_rx;
+        param->dma_dev = s->cfg->dma_dev;
+
+        chan = dma_request_channel(mask, filter, param);
+        dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan);
+        if (chan) {
+                dma_addr_t dma[2];
+                void *buf[2];
+                int i;
+
+                s->chan_rx = chan;
+
+                s->buf_len_rx = 2 * max(16, (int)port->fifosize);
+                buf[0] = dma_alloc_coherent(port->dev, s->buf_len_rx * 2,
+                                            &dma[0], GFP_KERNEL);
+
+                if (!buf[0]) {
+                        dev_warn(port->dev,
+                                 "failed to allocate dma buffer, using PIO\n");
+                        sci_rx_dma_release(s, true);
+                        return;
+                }
+
+                buf[1] = buf[0] + s->buf_len_rx;
+                dma[1] = dma[0] + s->buf_len_rx;
+
+                for (i = 0; i < 2; i++) {
+                        struct scatterlist *sg = &s->sg_rx[i];
+
+                        sg_init_table(sg, 1);
+                        sg_set_page(sg, virt_to_page(buf[i]), s->buf_len_rx,
+                                    (int)buf[i] & ~PAGE_MASK);
+                        sg_dma_address(sg) = dma[i];
+                }
+
+                INIT_WORK(&s->work_rx, work_fn_rx);
+                setup_timer(&s->rx_timer, rx_timer_fn, (unsigned long)s);
+
+                sci_submit_rx(s);
+        }
+}
+
+static void sci_free_dma(struct uart_port *port)
+{
+        struct sci_port *s = to_sci_port(port);
+
+        if (!s->cfg->dma_dev)
+                return;
+
+        if (s->chan_tx)
+                sci_tx_dma_release(s, false);
+        if (s->chan_rx)
+                sci_rx_dma_release(s, false);
+}
+#else
+static inline void sci_request_dma(struct uart_port *port)
+{
+}
+
+static inline void sci_free_dma(struct uart_port *port)
+{
+}
+#endif
+
+static int sci_startup(struct uart_port *port)
+{
+        struct sci_port *s = to_sci_port(port);
+        int ret;
+
+        dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
+
+        if (s->enable)
+                s->enable(port);
+
+        ret = sci_request_irq(s);
+        if (unlikely(ret < 0))
+                return ret;
+
+        sci_request_dma(port);
+
+        sci_start_tx(port);
+        sci_start_rx(port);
+
+        return 0;
+}
+
+static void sci_shutdown(struct uart_port *port)
+{
+        struct sci_port *s = to_sci_port(port);
+
+        dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
+
+        sci_stop_rx(port);
+        sci_stop_tx(port);
+
+        sci_free_dma(port);
+        sci_free_irq(s);
+
+        if (s->disable)
+                s->disable(port);
+}
+
+static unsigned int sci_scbrr_calc(unsigned int algo_id, unsigned int bps,
+                                   unsigned long freq)
+{
+        switch (algo_id) {
+        case SCBRR_ALGO_1:
+                return ((freq + 16 * bps) / (16 * bps) - 1);
+        case SCBRR_ALGO_2:
+                return ((freq + 16 * bps) / (32 * bps) - 1);
+        case SCBRR_ALGO_3:
+                return (((freq * 2) + 16 * bps) / (16 * bps) - 1);
+        case SCBRR_ALGO_4:
+                return (((freq * 2) + 16 * bps) / (32 * bps) - 1);
+        case SCBRR_ALGO_5:
+                return (((freq * 1000 / 32) / bps) - 1);
+        }
+
+        /* Warn, but use a safe default */
+        WARN_ON(1);
+
+        return ((freq + 16 * bps) / (32 * bps) - 1);
+}
+
+static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
+                            struct ktermios *old)
+{
+        struct sci_port *s = to_sci_port(port);
+        unsigned int status, baud, smr_val, max_baud;
+        int t = -1;
+        u16 scfcr = 0;
+
+        /*
+         * earlyprintk comes here early on with port->uartclk set to zero.
+         * the clock framework is not up and running at this point so here
+         * we assume that 115200 is the maximum baud rate. please note that
+         * the baud rate is not programmed during earlyprintk - it is assumed
+         * that the previous boot loader has enabled required clocks and
+         * setup the baud rate generator hardware for us already.
+         */
+        max_baud = port->uartclk ? port->uartclk / 16 : 115200;
+
+        baud = uart_get_baud_rate(port, termios, old, 0, max_baud);
+        if (likely(baud && port->uartclk))
+                t = sci_scbrr_calc(s->cfg->scbrr_algo_id, baud, port->uartclk);
+
+        if (s->enable)
+                s->enable(port);
+
+        do {
+                status = sci_in(port, SCxSR);
+        } while (!(status & SCxSR_TEND(port)));
+
+        sci_out(port, SCSCR, 0x00);     /* TE=0, RE=0, CKE1=0 */
+
+        if (port->type != PORT_SCI)
+                sci_out(port, SCFCR, scfcr | SCFCR_RFRST | SCFCR_TFRST);
+
+        smr_val = sci_in(port, SCSMR) & 3;
+
+        if ((termios->c_cflag & CSIZE) == CS7)
+                smr_val |= 0x40;
+        if (termios->c_cflag & PARENB)
+                smr_val |= 0x20;
+        if (termios->c_cflag & PARODD)
+                smr_val |= 0x30;
+        if (termios->c_cflag & CSTOPB)
+                smr_val |= 0x08;
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        sci_out(port, SCSMR, smr_val);
+
+        dev_dbg(port->dev, "%s: SMR %x, t %x, SCSCR %x\n", __func__, smr_val, t,
+                s->cfg->scscr);
+
+        if (t > 0) {
+                if (t >= 256) {
+                        sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
+                        t >>= 2;
+                } else
+                        sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
+
+                sci_out(port, SCBRR, t);
+                udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
+        }
+
+        sci_init_pins(port, termios->c_cflag);
+        sci_out(port, SCFCR, scfcr | ((termios->c_cflag & CRTSCTS) ? SCFCR_MCE : 0));
+
+        sci_out(port, SCSCR, s->cfg->scscr);
+
+#ifdef CONFIG_SERIAL_SH_SCI_DMA
+        /*
+         * Calculate delay for 1.5 DMA buffers: see
+         * drivers/serial/serial_core.c::uart_update_timeout(). With 10 bits
+         * (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above function
+         * calculates 1 jiffie for the data plus 5 jiffies for the "slop(e)."
+         * Then below we calculate 3 jiffies (12ms) for 1.5 DMA buffers (3 FIFO
+         * sizes), but it has been found out experimentally, that this is not
+         * enough: the driver too often needlessly runs on a DMA timeout. 20ms
+         * as a minimum seem to work perfectly.
+         */
+        if (s->chan_rx) {
+                s->rx_timeout = (port->timeout - HZ / 50) * s->buf_len_rx * 3 /
+                        port->fifosize / 2;
+                dev_dbg(port->dev,
+                        "DMA Rx t-out %ums, tty t-out %u jiffies\n",
+                        s->rx_timeout * 1000 / HZ, port->timeout);
+                if (s->rx_timeout < msecs_to_jiffies(20))
+                        s->rx_timeout = msecs_to_jiffies(20);
+        }
+#endif
+
+        if ((termios->c_cflag & CREAD) != 0)
+                sci_start_rx(port);
+
+        if (s->disable)
+                s->disable(port);
+}
+
+static const char *sci_type(struct uart_port *port)
+{
+        switch (port->type) {
+        case PORT_IRDA:
+                return "irda";
+        case PORT_SCI:
+                return "sci";
+        case PORT_SCIF:
+                return "scif";
+        case PORT_SCIFA:
+                return "scifa";
+        case PORT_SCIFB:
+                return "scifb";
+        }
+
+        return NULL;
+}
+
+static inline unsigned long sci_port_size(struct uart_port *port)
+{
+        /*
+         * Pick an arbitrary size that encapsulates all of the base
+         * registers by default. This can be optimized later, or derived
+         * from platform resource data at such a time that ports begin to
+         * behave more erratically.
+         */
+        return 64;
+}
+
+static int sci_remap_port(struct uart_port *port)
+{
+        unsigned long size = sci_port_size(port);
+
+        /*
+         * Nothing to do if there's already an established membase.
+         */
+        if (port->membase)
+                return 0;
+
+        if (port->flags & UPF_IOREMAP) {
+                port->membase = ioremap_nocache(port->mapbase, size);
+                if (unlikely(!port->membase)) {
+                        dev_err(port->dev, "can't remap port#%d\n", port->line);
+                        return -ENXIO;
+                }
+        } else {
+                /*
+                 * For the simple (and majority of) cases where we don't
+                 * need to do any remapping, just cast the cookie
+                 * directly.
+                 */
+                port->membase = (void __iomem *)port->mapbase;
+        }
+
+        return 0;
+}
+
+static void sci_release_port(struct uart_port *port)
+{
+        if (port->flags & UPF_IOREMAP) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+
+        release_mem_region(port->mapbase, sci_port_size(port));
+}
+
+static int sci_request_port(struct uart_port *port)
+{
+        unsigned long size = sci_port_size(port);
+        struct resource *res;
+        int ret;
+
+        res = request_mem_region(port->mapbase, size, dev_name(port->dev));
+        if (unlikely(res == NULL))
+                return -EBUSY;
+
+        ret = sci_remap_port(port);
+        if (unlikely(ret != 0)) {
+                release_resource(res);
+                return ret;
+        }
+
+        return 0;
+}
+
+static void sci_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                struct sci_port *sport = to_sci_port(port);
+
+                port->type = sport->cfg->type;
+                sci_request_port(port);
+        }
+}
+
+static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        struct sci_port *s = to_sci_port(port);
+
+        if (ser->irq != s->cfg->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs)
+                return -EINVAL;
+        if (ser->baud_base < 2400)
+                /* No paper tape reader for Mitch.. */
+                return -EINVAL;
+
+        return 0;
+}
+
+static struct uart_ops sci_uart_ops = {
+        .tx_empty       = sci_tx_empty,
+        .set_mctrl      = sci_set_mctrl,
+        .get_mctrl      = sci_get_mctrl,
+        .start_tx       = sci_start_tx,
+        .stop_tx        = sci_stop_tx,
+        .stop_rx        = sci_stop_rx,
+        .enable_ms      = sci_enable_ms,
+        .break_ctl      = sci_break_ctl,
+        .startup        = sci_startup,
+        .shutdown       = sci_shutdown,
+        .set_termios    = sci_set_termios,
+        .type           = sci_type,
+        .release_port   = sci_release_port,
+        .request_port   = sci_request_port,
+        .config_port    = sci_config_port,
+        .verify_port    = sci_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char  = sci_poll_get_char,
+        .poll_put_char  = sci_poll_put_char,
+#endif
+};
+
+static int __devinit sci_init_single(struct platform_device *dev,
+                                     struct sci_port *sci_port,
+                                     unsigned int index,
+                                     struct plat_sci_port *p)
+{
+        struct uart_port *port = &sci_port->port;
+
+        port->ops       = &sci_uart_ops;
+        port->iotype    = UPIO_MEM;
+        port->line      = index;
+
+        switch (p->type) {
+        case PORT_SCIFB:
+                port->fifosize = 256;
+                break;
+        case PORT_SCIFA:
+                port->fifosize = 64;
+                break;
+        case PORT_SCIF:
+                port->fifosize = 16;
+                break;
+        default:
+                port->fifosize = 1;
+                break;
+        }
+
+        if (dev) {
+                sci_port->iclk = clk_get(&dev->dev, "sci_ick");
+                if (IS_ERR(sci_port->iclk)) {
+                        sci_port->iclk = clk_get(&dev->dev, "peripheral_clk");
+                        if (IS_ERR(sci_port->iclk)) {
+                                dev_err(&dev->dev, "can't get iclk\n");
+                                return PTR_ERR(sci_port->iclk);
+                        }
+                }
+
+                /*
+                 * The function clock is optional, ignore it if we can't
+                 * find it.
+                 */
+                sci_port->fclk = clk_get(&dev->dev, "sci_fck");
+                if (IS_ERR(sci_port->fclk))
+                        sci_port->fclk = NULL;
+
+                sci_port->enable = sci_clk_enable;
+                sci_port->disable = sci_clk_disable;
+                port->dev = &dev->dev;
+
+                pm_runtime_enable(&dev->dev);
+        }
+
+        sci_port->break_timer.data = (unsigned long)sci_port;
+        sci_port->break_timer.function = sci_break_timer;
+        init_timer(&sci_port->break_timer);
+
+        sci_port->cfg           = p;
+
+        port->mapbase           = p->mapbase;
+        port->type              = p->type;
+        port->flags             = p->flags;
+
+        /*
+         * The UART port needs an IRQ value, so we peg this to the TX IRQ
+         * for the multi-IRQ ports, which is where we are primarily
+         * concerned with the shutdown path synchronization.
+         *
+         * For the muxed case there's nothing more to do.
+         */
+        port->irq               = p->irqs[SCIx_RXI_IRQ];
+
+        if (p->dma_dev)
+                dev_dbg(port->dev, "DMA device %p, tx %d, rx %d\n",
+                        p->dma_dev, p->dma_slave_tx, p->dma_slave_rx);
+
+        return 0;
+}
+
+#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
+static void serial_console_putchar(struct uart_port *port, int ch)
+{
+        sci_poll_put_char(port, ch);
+}
+
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ */
+static void serial_console_write(struct console *co, const char *s,
+                                 unsigned count)
+{
+        struct sci_port *sci_port = &sci_ports[co->index];
+        struct uart_port *port = &sci_port->port;
+        unsigned short bits;
+
+        if (sci_port->enable)
+                sci_port->enable(port);
+
+        uart_console_write(port, s, count, serial_console_putchar);
+
+        /* wait until fifo is empty and last bit has been transmitted */
+        bits = SCxSR_TDxE(port) | SCxSR_TEND(port);
+        while ((sci_in(port, SCxSR) & bits) != bits)
+                cpu_relax();
+
+        if (sci_port->disable)
+                sci_port->disable(port);
+}
+
+static int __devinit serial_console_setup(struct console *co, char *options)
+{
+        struct sci_port *sci_port;
+        struct uart_port *port;
+        int baud = 115200;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+
+        /*
+         * Refuse to handle any bogus ports.
+         */
+        if (co->index < 0 || co->index >= SCI_NPORTS)
+                return -ENODEV;
+
+        sci_port = &sci_ports[co->index];
+        port = &sci_port->port;
+
+        /*
+         * Refuse to handle uninitialized ports.
+         */
+        if (!port->ops)
+                return -ENODEV;
+
+        ret = sci_remap_port(port);
+        if (unlikely(ret != 0))
+                return ret;
+
+        if (sci_port->enable)
+                sci_port->enable(port);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        ret = uart_set_options(port, co, baud, parity, bits, flow);
+#if defined(__H8300H__) || defined(__H8300S__)
+        /* disable rx interrupt */
+        if (ret == 0)
+                sci_stop_rx(port);
+#endif
+        /* TODO: disable clock */
+        return ret;
+}
+
+static struct console serial_console = {
+        .name           = "ttySC",
+        .device         = uart_console_device,
+        .write          = serial_console_write,
+        .setup          = serial_console_setup,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+        .data           = &sci_uart_driver,
+};
+
+static struct console early_serial_console = {
+        .name           = "early_ttySC",
+        .write          = serial_console_write,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+};
+
+static char early_serial_buf[32];
+
+static int __devinit sci_probe_earlyprintk(struct platform_device *pdev)
+{
+        struct plat_sci_port *cfg = pdev->dev.platform_data;
+
+        if (early_serial_console.data)
+                return -EEXIST;
+
+        early_serial_console.index = pdev->id;
+
+        sci_init_single(NULL, &sci_ports[pdev->id], pdev->id, cfg);
+
+        serial_console_setup(&early_serial_console, early_serial_buf);
+
+        if (!strstr(early_serial_buf, "keep"))
+                early_serial_console.flags |= CON_BOOT;
+
+        register_console(&early_serial_console);
+        return 0;
+}
+
+#define SCI_CONSOLE     (&serial_console)
+
+#else
+static inline int __devinit sci_probe_earlyprintk(struct platform_device *pdev)
+{
+        return -EINVAL;
+}
+
+#define SCI_CONSOLE     NULL
+
+#endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
+
+static char banner[] __initdata =
+        KERN_INFO "SuperH SCI(F) driver initialized\n";
+
+static struct uart_driver sci_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "sci",
+        .dev_name       = "ttySC",
+        .major          = SCI_MAJOR,
+        .minor          = SCI_MINOR_START,
+        .nr             = SCI_NPORTS,
+        .cons           = SCI_CONSOLE,
+};
+
+static int sci_remove(struct platform_device *dev)
+{
+        struct sci_port *port = platform_get_drvdata(dev);
+
+        cpufreq_unregister_notifier(&port->freq_transition,
+                                    CPUFREQ_TRANSITION_NOTIFIER);
+
+        uart_remove_one_port(&sci_uart_driver, &port->port);
+
+        clk_put(port->iclk);
+        clk_put(port->fclk);
+
+        pm_runtime_disable(&dev->dev);
+        return 0;
+}
+
+static int __devinit sci_probe_single(struct platform_device *dev,
+                                      unsigned int index,
+                                      struct plat_sci_port *p,
+                                      struct sci_port *sciport)
+{
+        int ret;
+
+        /* Sanity check */
+        if (unlikely(index >= SCI_NPORTS)) {
+                dev_notice(&dev->dev, "Attempting to register port "
+                           "%d when only %d are available.\n",
+                           index+1, SCI_NPORTS);
+                dev_notice(&dev->dev, "Consider bumping "
+                           "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
+                return 0;
+        }
+
+        ret = sci_init_single(dev, sciport, index, p);
+        if (ret)
+                return ret;
+
+        return uart_add_one_port(&sci_uart_driver, &sciport->port);
+}
+
+static int __devinit sci_probe(struct platform_device *dev)
+{
+        struct plat_sci_port *p = dev->dev.platform_data;
+        struct sci_port *sp = &sci_ports[dev->id];
+        int ret;
+
+        /*
+         * If we've come here via earlyprintk initialization, head off to
+         * the special early probe. We don't have sufficient device state
+         * to make it beyond this yet.
+         */
+        if (is_early_platform_device(dev))
+                return sci_probe_earlyprintk(dev);
+
+        platform_set_drvdata(dev, sp);
+
+        ret = sci_probe_single(dev, dev->id, p, sp);
+        if (ret)
+                goto err_unreg;
+
+        sp->freq_transition.notifier_call = sci_notifier;
+
+        ret = cpufreq_register_notifier(&sp->freq_transition,
+                                        CPUFREQ_TRANSITION_NOTIFIER);
+        if (unlikely(ret < 0))
+                goto err_unreg;
+
+#ifdef CONFIG_SH_STANDARD_BIOS
+        sh_bios_gdb_detach();
+#endif
+
+        return 0;
+
+err_unreg:
+        sci_remove(dev);
+        return ret;
+}
+
+static int sci_suspend(struct device *dev)
+{
+        struct sci_port *sport = dev_get_drvdata(dev);
+
+        if (sport)
+                uart_suspend_port(&sci_uart_driver, &sport->port);
+
+        return 0;
+}
+
+static int sci_resume(struct device *dev)
+{
+        struct sci_port *sport = dev_get_drvdata(dev);
+
+        if (sport)
+                uart_resume_port(&sci_uart_driver, &sport->port);
+
+        return 0;
+}
+
+static const struct dev_pm_ops sci_dev_pm_ops = {
+        .suspend        = sci_suspend,
+        .resume         = sci_resume,
+};
+
+static struct platform_driver sci_driver = {
+        .probe          = sci_probe,
+        .remove         = sci_remove,
+        .driver         = {
+                .name   = "sh-sci",
+                .owner  = THIS_MODULE,
+                .pm     = &sci_dev_pm_ops,
+        },
+};
+
+static int __init sci_init(void)
+{
+        int ret;
+
+        printk(banner);
+
+        ret = uart_register_driver(&sci_uart_driver);
+        if (likely(ret == 0)) {
+                ret = platform_driver_register(&sci_driver);
+                if (unlikely(ret))
+                        uart_unregister_driver(&sci_uart_driver);
+        }
+
+        return ret;
+}
+
+static void __exit sci_exit(void)
+{
+        platform_driver_unregister(&sci_driver);
+        uart_unregister_driver(&sci_uart_driver);
+}
+
+#ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
+early_platform_init_buffer("earlyprintk", &sci_driver,
+                           early_serial_buf, ARRAY_SIZE(early_serial_buf));
+#endif
+module_init(sci_init);
+module_exit(sci_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sh-sci");
diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h
new file mode 100644
index 000000000000..b04d937c9110
--- /dev/null
+++ b/drivers/tty/serial/sh-sci.h
@@ -0,0 +1,468 @@
+#include <linux/serial_core.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#if defined(CONFIG_H83007) || defined(CONFIG_H83068)
+#include <asm/regs306x.h>
+#endif
+#if defined(CONFIG_H8S2678)
+#include <asm/regs267x.h>
+#endif
+
+#if defined(CONFIG_CPU_SUBTYPE_SH7706) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7707) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7708) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7709)
+# define SCPCR  0xA4000116 /* 16 bit SCI and SCIF */
+# define SCPDR  0xA4000136 /* 8  bit SCI and SCIF */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7705)
+# define SCIF0          0xA4400000
+# define SCIF2          0xA4410000
+# define SCPCR 0xA4000116
+# define SCPDR 0xA4000136
+#elif defined(CONFIG_CPU_SUBTYPE_SH7720) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7721) || \
+      defined(CONFIG_ARCH_SH73A0) || \
+      defined(CONFIG_ARCH_SH7367) || \
+      defined(CONFIG_ARCH_SH7377) || \
+      defined(CONFIG_ARCH_SH7372)
+# define PORT_PTCR         0xA405011EUL
+# define PORT_PVCR         0xA4050122UL
+# define SCIF_ORER         0x0200   /* overrun error bit */
+#elif defined(CONFIG_SH_RTS7751R2D)
+# define SCSPTR1 0xFFE0001C /* 8 bit SCIF */
+# define SCSPTR2 0xFFE80020 /* 16 bit SCIF */
+# define SCIF_ORER 0x0001   /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7750)  || \
+      defined(CONFIG_CPU_SUBTYPE_SH7750R) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7750S) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7091)  || \
+      defined(CONFIG_CPU_SUBTYPE_SH7751)  || \
+      defined(CONFIG_CPU_SUBTYPE_SH7751R)
+# define SCSPTR1 0xffe0001c /* 8  bit SCI */
+# define SCSPTR2 0xFFE80020 /* 16 bit SCIF */
+# define SCIF_ORER 0x0001   /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7760)
+# define SCSPTR0 0xfe600024 /* 16 bit SCIF */
+# define SCSPTR1 0xfe610024 /* 16 bit SCIF */
+# define SCSPTR2 0xfe620024 /* 16 bit SCIF */
+# define SCIF_ORER 0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
+# define SCSPTR0 0xA4400000       /* 16 bit SCIF */
+# define SCIF_ORER 0x0001   /* overrun error bit */
+# define PACR 0xa4050100
+# define PBCR 0xa4050102
+#elif defined(CONFIG_CPU_SUBTYPE_SH7343)
+# define SCSPTR0 0xffe00010     /* 16 bit SCIF */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7722)
+# define PADR                   0xA4050120
+# define PSDR                   0xA405013e
+# define PWDR                   0xA4050166
+# define PSCR                   0xA405011E
+# define SCIF_ORER              0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7366)
+# define SCPDR0                 0xA405013E      /* 16 bit SCIF0 PSDR */
+# define SCSPTR0                SCPDR0
+# define SCIF_ORER              0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7723)
+# define SCSPTR0                0xa4050160
+# define SCIF_ORER              0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7724)
+# define SCIF_ORER              0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH4_202)
+# define SCSPTR2 0xffe80020 /* 16 bit SCIF */
+# define SCIF_ORER 0x0001   /* overrun error bit */
+#elif defined(CONFIG_H83007) || defined(CONFIG_H83068)
+# define H8300_SCI_DR(ch) *(volatile char *)(P1DR + h8300_sci_pins[ch].port)
+#elif defined(CONFIG_H8S2678)
+# define H8300_SCI_DR(ch) *(volatile char *)(P1DR + h8300_sci_pins[ch].port)
+#elif defined(CONFIG_CPU_SUBTYPE_SH7757)
+# define SCSPTR0 0xfe4b0020
+# define SCIF_ORER 0x0001
+#elif defined(CONFIG_CPU_SUBTYPE_SH7763)
+# define SCSPTR0 0xffe00024 /* 16 bit SCIF */
+# define SCIF_ORER 0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7770)
+# define SCSPTR0 0xff923020 /* 16 bit SCIF */
+# define SCIF_ORER 0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7780)
+# define SCSPTR0        0xffe00024      /* 16 bit SCIF */
+# define SCIF_ORER      0x0001          /* Overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7785) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7786)
+# define SCSPTR0        0xffea0024      /* 16 bit SCIF */
+# define SCIF_ORER      0x0001          /* Overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7201) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7203) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7206) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7263)
+# define SCSPTR0 0xfffe8020 /* 16 bit SCIF */
+#elif defined(CONFIG_CPU_SUBTYPE_SH7619)
+# define SCSPTR0 0xf8400020 /* 16 bit SCIF */
+# define SCIF_ORER 0x0001  /* overrun error bit */
+#elif defined(CONFIG_CPU_SUBTYPE_SHX3)
+# define SCSPTR0 0xffc30020             /* 16 bit SCIF */
+# define SCIF_ORER 0x0001               /* Overrun error bit */
+#else
+# error CPU subtype not defined
+#endif
+
+/* SCxSR SCI */
+#define SCI_TDRE  0x80 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+#define SCI_RDRF  0x40 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+#define SCI_ORER  0x20 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+#define SCI_FER   0x10 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+#define SCI_PER   0x08 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+#define SCI_TEND  0x04 /* 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+/*      SCI_MPB   0x02  * 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+/*      SCI_MPBT  0x01  * 7707 SCI, 7708 SCI, 7709 SCI, 7750 SCI */
+
+#define SCI_ERRORS ( SCI_PER | SCI_FER | SCI_ORER)
+
+/* SCxSR SCIF */
+#define SCIF_ER    0x0080 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+#define SCIF_TEND  0x0040 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+#define SCIF_TDFE  0x0020 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+#define SCIF_BRK   0x0010 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+#define SCIF_FER   0x0008 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+#define SCIF_PER   0x0004 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+#define SCIF_RDF   0x0002 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+#define SCIF_DR    0x0001 /* 7705 SCIF, 7707 SCIF, 7709 SCIF, 7750 SCIF */
+
+#if defined(CONFIG_CPU_SUBTYPE_SH7705) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7720) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7721) || \
+    defined(CONFIG_ARCH_SH73A0) || \
+    defined(CONFIG_ARCH_SH7367) || \
+    defined(CONFIG_ARCH_SH7377) || \
+    defined(CONFIG_ARCH_SH7372)
+# define SCIF_ORER    0x0200
+# define SCIF_ERRORS ( SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK | SCIF_ORER)
+# define SCIF_RFDC_MASK 0x007f
+# define SCIF_TXROOM_MAX 64
+#elif defined(CONFIG_CPU_SUBTYPE_SH7763)
+# define SCIF_ERRORS ( SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK )
+# define SCIF_RFDC_MASK 0x007f
+# define SCIF_TXROOM_MAX 64
+/* SH7763 SCIF2 support */
+# define SCIF2_RFDC_MASK 0x001f
+# define SCIF2_TXROOM_MAX 16
+#else
+# define SCIF_ERRORS ( SCIF_PER | SCIF_FER | SCIF_ER | SCIF_BRK)
+# define SCIF_RFDC_MASK 0x001f
+# define SCIF_TXROOM_MAX 16
+#endif
+
+#ifndef SCIF_ORER
+#define SCIF_ORER       0x0000
+#endif
+
+#define SCxSR_TEND(port)        (((port)->type == PORT_SCI) ? SCI_TEND   : SCIF_TEND)
+#define SCxSR_ERRORS(port)      (((port)->type == PORT_SCI) ? SCI_ERRORS : SCIF_ERRORS)
+#define SCxSR_RDxF(port)        (((port)->type == PORT_SCI) ? SCI_RDRF   : SCIF_RDF)
+#define SCxSR_TDxE(port)        (((port)->type == PORT_SCI) ? SCI_TDRE   : SCIF_TDFE)
+#define SCxSR_FER(port)         (((port)->type == PORT_SCI) ? SCI_FER    : SCIF_FER)
+#define SCxSR_PER(port)         (((port)->type == PORT_SCI) ? SCI_PER    : SCIF_PER)
+#define SCxSR_BRK(port)         (((port)->type == PORT_SCI) ? 0x00       : SCIF_BRK)
+#define SCxSR_ORER(port)        (((port)->type == PORT_SCI) ? SCI_ORER   : SCIF_ORER)
+
+#if defined(CONFIG_CPU_SUBTYPE_SH7705) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7720) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7721) || \
+    defined(CONFIG_ARCH_SH73A0) || \
+    defined(CONFIG_ARCH_SH7367) || \
+    defined(CONFIG_ARCH_SH7377) || \
+    defined(CONFIG_ARCH_SH7372)
+# define SCxSR_RDxF_CLEAR(port)  (sci_in(port, SCxSR) & 0xfffc)
+# define SCxSR_ERROR_CLEAR(port) (sci_in(port, SCxSR) & 0xfd73)
+# define SCxSR_TDxE_CLEAR(port)  (sci_in(port, SCxSR) & 0xffdf)
+# define SCxSR_BREAK_CLEAR(port) (sci_in(port, SCxSR) & 0xffe3)
+#else
+# define SCxSR_RDxF_CLEAR(port)  (((port)->type == PORT_SCI) ? 0xbc : 0x00fc)
+# define SCxSR_ERROR_CLEAR(port) (((port)->type == PORT_SCI) ? 0xc4 : 0x0073)
+# define SCxSR_TDxE_CLEAR(port)  (((port)->type == PORT_SCI) ? 0x78 : 0x00df)
+# define SCxSR_BREAK_CLEAR(port) (((port)->type == PORT_SCI) ? 0xc4 : 0x00e3)
+#endif
+
+/* SCFCR */
+#define SCFCR_RFRST 0x0002
+#define SCFCR_TFRST 0x0004
+#define SCFCR_MCE   0x0008
+
+#define SCI_MAJOR               204
+#define SCI_MINOR_START         8
+
+#define SCI_IN(size, offset)                                    \
+  if ((size) == 8) {                                            \
+    return ioread8(port->membase + (offset));                   \
+  } else {                                                      \
+    return ioread16(port->membase + (offset));                  \
+  }
+#define SCI_OUT(size, offset, value)                            \
+  if ((size) == 8) {                                            \
+    iowrite8(value, port->membase + (offset));                  \
+  } else if ((size) == 16) {                                    \
+    iowrite16(value, port->membase + (offset));                 \
+  }
+
+#define CPU_SCIx_FNS(name, sci_offset, sci_size, scif_offset, scif_size)\
+  static inline unsigned int sci_##name##_in(struct uart_port *port)    \
+  {                                                                     \
+    if (port->type == PORT_SCIF || port->type == PORT_SCIFB) {          \
+      SCI_IN(scif_size, scif_offset)                                    \
+    } else {    /* PORT_SCI or PORT_SCIFA */                            \
+      SCI_IN(sci_size, sci_offset);                                     \
+    }                                                                   \
+  }                                                                     \
+  static inline void sci_##name##_out(struct uart_port *port, unsigned int value) \
+  {                                                                     \
+    if (port->type == PORT_SCIF || port->type == PORT_SCIFB) {          \
+      SCI_OUT(scif_size, scif_offset, value)                            \
+    } else {    /* PORT_SCI or PORT_SCIFA */                            \
+      SCI_OUT(sci_size, sci_offset, value);                             \
+    }                                                                   \
+  }
+
+#ifdef CONFIG_H8300
+/* h8300 don't have SCIF */
+#define CPU_SCIF_FNS(name)                                              \
+  static inline unsigned int sci_##name##_in(struct uart_port *port)    \
+  {                                                                     \
+    return 0;                                                           \
+  }                                                                     \
+  static inline void sci_##name##_out(struct uart_port *port, unsigned int value) \
+  {                                                                     \
+  }
+#else
+#define CPU_SCIF_FNS(name, scif_offset, scif_size)                      \
+  static inline unsigned int sci_##name##_in(struct uart_port *port)    \
+  {                                                                     \
+    SCI_IN(scif_size, scif_offset);                                     \
+  }                                                                     \
+  static inline void sci_##name##_out(struct uart_port *port, unsigned int value) \
+  {                                                                     \
+    SCI_OUT(scif_size, scif_offset, value);                             \
+  }
+#endif
+
+#define CPU_SCI_FNS(name, sci_offset, sci_size)                         \
+  static inline unsigned int sci_##name##_in(struct uart_port* port)    \
+  {                                                                     \
+    SCI_IN(sci_size, sci_offset);                                       \
+  }                                                                     \
+  static inline void sci_##name##_out(struct uart_port* port, unsigned int value) \
+  {                                                                     \
+    SCI_OUT(sci_size, sci_offset, value);                               \
+  }
+
+#if defined(CONFIG_CPU_SH3) || \
+    defined(CONFIG_ARCH_SH73A0) || \
+    defined(CONFIG_ARCH_SH7367) || \
+    defined(CONFIG_ARCH_SH7377) || \
+    defined(CONFIG_ARCH_SH7372)
+#if defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
+#define SCIx_FNS(name, sh3_sci_offset, sh3_sci_size, sh4_sci_offset, sh4_sci_size, \
+                                sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size, \
+                                 h8_sci_offset, h8_sci_size) \
+  CPU_SCIx_FNS(name, sh4_sci_offset, sh4_sci_size, sh4_scif_offset, sh4_scif_size)
+#define SCIF_FNS(name, sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size) \
+          CPU_SCIF_FNS(name, sh4_scif_offset, sh4_scif_size)
+#elif defined(CONFIG_CPU_SUBTYPE_SH7705) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7720) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7721) || \
+      defined(CONFIG_ARCH_SH7367)
+#define SCIF_FNS(name, scif_offset, scif_size) \
+  CPU_SCIF_FNS(name, scif_offset, scif_size)
+#elif defined(CONFIG_ARCH_SH7377) || \
+      defined(CONFIG_ARCH_SH7372) || \
+      defined(CONFIG_ARCH_SH73A0)
+#define SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size, sh4_scifb_offset, sh4_scifb_size) \
+  CPU_SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size, sh4_scifb_offset, sh4_scifb_size)
+#define SCIF_FNS(name, scif_offset, scif_size) \
+  CPU_SCIF_FNS(name, scif_offset, scif_size)
+#else
+#define SCIx_FNS(name, sh3_sci_offset, sh3_sci_size, sh4_sci_offset, sh4_sci_size, \
+                 sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size, \
+                 h8_sci_offset, h8_sci_size) \
+  CPU_SCIx_FNS(name, sh3_sci_offset, sh3_sci_size, sh3_scif_offset, sh3_scif_size)
+#define SCIF_FNS(name, sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size) \
+  CPU_SCIF_FNS(name, sh3_scif_offset, sh3_scif_size)
+#endif
+#elif defined(__H8300H__) || defined(__H8300S__)
+#define SCIx_FNS(name, sh3_sci_offset, sh3_sci_size, sh4_sci_offset, sh4_sci_size, \
+                 sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size, \
+                 h8_sci_offset, h8_sci_size) \
+  CPU_SCI_FNS(name, h8_sci_offset, h8_sci_size)
+#define SCIF_FNS(name, sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size) \
+  CPU_SCIF_FNS(name)
+#elif defined(CONFIG_CPU_SUBTYPE_SH7723) ||\
+      defined(CONFIG_CPU_SUBTYPE_SH7724)
+        #define SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size, sh4_scif_offset, sh4_scif_size) \
+                CPU_SCIx_FNS(name, sh4_scifa_offset, sh4_scifa_size, sh4_scif_offset, sh4_scif_size)
+        #define SCIF_FNS(name, sh4_scif_offset, sh4_scif_size) \
+                CPU_SCIF_FNS(name, sh4_scif_offset, sh4_scif_size)
+#else
+#define SCIx_FNS(name, sh3_sci_offset, sh3_sci_size, sh4_sci_offset, sh4_sci_size, \
+                 sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size, \
+                 h8_sci_offset, h8_sci_size) \
+  CPU_SCIx_FNS(name, sh4_sci_offset, sh4_sci_size, sh4_scif_offset, sh4_scif_size)
+#define SCIF_FNS(name, sh3_scif_offset, sh3_scif_size, sh4_scif_offset, sh4_scif_size) \
+  CPU_SCIF_FNS(name, sh4_scif_offset, sh4_scif_size)
+#endif
+
+#if defined(CONFIG_CPU_SUBTYPE_SH7705) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7720) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7721) || \
+    defined(CONFIG_ARCH_SH7367)
+
+SCIF_FNS(SCSMR,  0x00, 16)
+SCIF_FNS(SCBRR,  0x04,  8)
+SCIF_FNS(SCSCR,  0x08, 16)
+SCIF_FNS(SCxSR,  0x14, 16)
+SCIF_FNS(SCFCR,  0x18, 16)
+SCIF_FNS(SCFDR,  0x1c, 16)
+SCIF_FNS(SCxTDR, 0x20,  8)
+SCIF_FNS(SCxRDR, 0x24,  8)
+SCIF_FNS(SCLSR,  0x00,  0)
+#elif defined(CONFIG_ARCH_SH7377) || \
+      defined(CONFIG_ARCH_SH7372) || \
+      defined(CONFIG_ARCH_SH73A0)
+SCIF_FNS(SCSMR,  0x00, 16)
+SCIF_FNS(SCBRR,  0x04,  8)
+SCIF_FNS(SCSCR,  0x08, 16)
+SCIF_FNS(SCTDSR, 0x0c, 16)
+SCIF_FNS(SCFER,  0x10, 16)
+SCIF_FNS(SCxSR,  0x14, 16)
+SCIF_FNS(SCFCR,  0x18, 16)
+SCIF_FNS(SCFDR,  0x1c, 16)
+SCIF_FNS(SCTFDR, 0x38, 16)
+SCIF_FNS(SCRFDR, 0x3c, 16)
+SCIx_FNS(SCxTDR, 0x20,  8, 0x40,  8)
+SCIx_FNS(SCxRDR, 0x24,  8, 0x60,  8)
+SCIF_FNS(SCLSR,  0x00,  0)
+#elif defined(CONFIG_CPU_SUBTYPE_SH7723) ||\
+      defined(CONFIG_CPU_SUBTYPE_SH7724)
+SCIx_FNS(SCSMR,  0x00, 16, 0x00, 16)
+SCIx_FNS(SCBRR,  0x04,  8, 0x04,  8)
+SCIx_FNS(SCSCR,  0x08, 16, 0x08, 16)
+SCIx_FNS(SCxTDR, 0x20,  8, 0x0c,  8)
+SCIx_FNS(SCxSR,  0x14, 16, 0x10, 16)
+SCIx_FNS(SCxRDR, 0x24,  8, 0x14,  8)
+SCIx_FNS(SCSPTR, 0,     0,    0,  0)
+SCIF_FNS(SCFCR,  0x18, 16)
+SCIF_FNS(SCFDR,  0x1c, 16)
+SCIF_FNS(SCLSR,  0x24, 16)
+#else
+/*      reg      SCI/SH3   SCI/SH4  SCIF/SH3   SCIF/SH4  SCI/H8*/
+/*      name     off  sz   off  sz   off  sz   off  sz   off  sz*/
+SCIx_FNS(SCSMR,  0x00,  8, 0x00,  8, 0x00,  8, 0x00, 16, 0x00,  8)
+SCIx_FNS(SCBRR,  0x02,  8, 0x04,  8, 0x02,  8, 0x04,  8, 0x01,  8)
+SCIx_FNS(SCSCR,  0x04,  8, 0x08,  8, 0x04,  8, 0x08, 16, 0x02,  8)
+SCIx_FNS(SCxTDR, 0x06,  8, 0x0c,  8, 0x06,  8, 0x0C,  8, 0x03,  8)
+SCIx_FNS(SCxSR,  0x08,  8, 0x10,  8, 0x08, 16, 0x10, 16, 0x04,  8)
+SCIx_FNS(SCxRDR, 0x0a,  8, 0x14,  8, 0x0A,  8, 0x14,  8, 0x05,  8)
+SCIF_FNS(SCFCR,                      0x0c,  8, 0x18, 16)
+#if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7780) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7785) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7786)
+SCIF_FNS(SCFDR,                      0x0e, 16, 0x1C, 16)
+SCIF_FNS(SCTFDR,                     0x0e, 16, 0x1C, 16)
+SCIF_FNS(SCRFDR,                     0x0e, 16, 0x20, 16)
+SCIF_FNS(SCSPTR,                        0,  0, 0x24, 16)
+SCIF_FNS(SCLSR,                         0,  0, 0x28, 16)
+#elif defined(CONFIG_CPU_SUBTYPE_SH7763)
+SCIF_FNS(SCFDR,                         0,  0, 0x1C, 16)
+SCIF_FNS(SCTFDR,                     0x0e, 16, 0x1C, 16)
+SCIF_FNS(SCRFDR,                     0x0e, 16, 0x20, 16)
+SCIF_FNS(SCSPTR,                        0,  0, 0x24, 16)
+SCIF_FNS(SCLSR,                         0,  0, 0x28, 16)
+#else
+SCIF_FNS(SCFDR,                      0x0e, 16, 0x1C, 16)
+#if defined(CONFIG_CPU_SUBTYPE_SH7722)
+SCIF_FNS(SCSPTR,                        0,  0, 0, 0)
+#else
+SCIF_FNS(SCSPTR,                        0,  0, 0x20, 16)
+#endif
+SCIF_FNS(SCLSR,                         0,  0, 0x24, 16)
+#endif
+#endif
+#define sci_in(port, reg) sci_##reg##_in(port)
+#define sci_out(port, reg, value) sci_##reg##_out(port, value)
+
+/* H8/300 series SCI pins assignment */
+#if defined(__H8300H__) || defined(__H8300S__)
+static const struct __attribute__((packed)) {
+        int port;             /* GPIO port no */
+        unsigned short rx,tx; /* GPIO bit no */
+} h8300_sci_pins[] = {
+#if defined(CONFIG_H83007) || defined(CONFIG_H83068)
+        {    /* SCI0 */
+                .port = H8300_GPIO_P9,
+                .rx   = H8300_GPIO_B2,
+                .tx   = H8300_GPIO_B0,
+        },
+        {    /* SCI1 */
+                .port = H8300_GPIO_P9,
+                .rx   = H8300_GPIO_B3,
+                .tx   = H8300_GPIO_B1,
+        },
+        {    /* SCI2 */
+                .port = H8300_GPIO_PB,
+                .rx   = H8300_GPIO_B7,
+                .tx   = H8300_GPIO_B6,
+        }
+#elif defined(CONFIG_H8S2678)
+        {    /* SCI0 */
+                .port = H8300_GPIO_P3,
+                .rx   = H8300_GPIO_B2,
+                .tx   = H8300_GPIO_B0,
+        },
+        {    /* SCI1 */
+                .port = H8300_GPIO_P3,
+                .rx   = H8300_GPIO_B3,
+                .tx   = H8300_GPIO_B1,
+        },
+        {    /* SCI2 */
+                .port = H8300_GPIO_P5,
+                .rx   = H8300_GPIO_B1,
+                .tx   = H8300_GPIO_B0,
+        }
+#endif
+};
+#endif
+
+#if defined(CONFIG_CPU_SUBTYPE_SH7706) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7707) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7708) || \
+    defined(CONFIG_CPU_SUBTYPE_SH7709)
+static inline int sci_rxd_in(struct uart_port *port)
+{
+        if (port->mapbase == 0xfffffe80)
+                return __raw_readb(SCPDR)&0x01 ? 1 : 0; /* SCI */
+        return 1;
+}
+#elif defined(CONFIG_CPU_SUBTYPE_SH7750)  || \
+      defined(CONFIG_CPU_SUBTYPE_SH7751)  || \
+      defined(CONFIG_CPU_SUBTYPE_SH7751R) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7750R) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7750S) || \
+      defined(CONFIG_CPU_SUBTYPE_SH7091)
+static inline int sci_rxd_in(struct uart_port *port)
+{
+        if (port->mapbase == 0xffe00000)
+                return __raw_readb(SCSPTR1)&0x01 ? 1 : 0; /* SCI */
+        return 1;
+}
+#elif defined(__H8300H__) || defined(__H8300S__)
+static inline int sci_rxd_in(struct uart_port *port)
+{
+        int ch = (port->mapbase - SMR0) >> 3;
+        return (H8300_SCI_DR(ch) & h8300_sci_pins[ch].rx) ? 1 : 0;
+}
+#else /* default case for non-SCI processors */
+static inline int sci_rxd_in(struct uart_port *port)
+{
+        return 1;
+}
+#endif
diff --git a/drivers/tty/serial/sn_console.c b/drivers/tty/serial/sn_console.c
new file mode 100644
index 000000000000..377ae74e7154
--- /dev/null
+++ b/drivers/tty/serial/sn_console.c
@@ -0,0 +1,1085 @@
+/*
+ * C-Brick Serial Port (and console) driver for SGI Altix machines.
+ *
+ * This driver is NOT suitable for talking to the l1-controller for
+ * anything other than 'console activities' --- please use the l1
+ * driver for that.
+ *
+ *
+ * Copyright (c) 2004-2006 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information:  Silicon Graphics, Inc., 1500 Crittenden Lane,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/NoticeExplan
+ */
+
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/console.h>
+#include <linux/module.h>
+#include <linux/sysrq.h>
+#include <linux/circ_buf.h>
+#include <linux/serial_reg.h>
+#include <linux/delay.h> /* for mdelay */
+#include <linux/miscdevice.h>
+#include <linux/serial_core.h>
+
+#include <asm/io.h>
+#include <asm/sn/simulator.h>
+#include <asm/sn/sn_sal.h>
+
+/* number of characters we can transmit to the SAL console at a time */
+#define SN_SAL_MAX_CHARS 120
+
+/* 64K, when we're asynch, it must be at least printk's LOG_BUF_LEN to
+ * avoid losing chars, (always has to be a power of 2) */
+#define SN_SAL_BUFFER_SIZE (64 * (1 << 10))
+
+#define SN_SAL_UART_FIFO_DEPTH 16
+#define SN_SAL_UART_FIFO_SPEED_CPS (9600/10)
+
+/* sn_transmit_chars() calling args */
+#define TRANSMIT_BUFFERED       0
+#define TRANSMIT_RAW            1
+
+/* To use dynamic numbers only and not use the assigned major and minor,
+ * define the following.. */
+                                  /* #define USE_DYNAMIC_MINOR 1 *//* use dynamic minor number */
+#define USE_DYNAMIC_MINOR 0     /* Don't rely on misc_register dynamic minor */
+
+/* Device name we're using */
+#define DEVICE_NAME "ttySG"
+#define DEVICE_NAME_DYNAMIC "ttySG0"    /* need full name for misc_register */
+/* The major/minor we are using, ignored for USE_DYNAMIC_MINOR */
+#define DEVICE_MAJOR 204
+#define DEVICE_MINOR 40
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static char sysrq_serial_str[] = "\eSYS";
+static char *sysrq_serial_ptr = sysrq_serial_str;
+static unsigned long sysrq_requested;
+#endif /* CONFIG_MAGIC_SYSRQ */
+
+/*
+ * Port definition - this kinda drives it all
+ */
+struct sn_cons_port {
+        struct timer_list sc_timer;
+        struct uart_port sc_port;
+        struct sn_sal_ops {
+                int (*sal_puts_raw) (const char *s, int len);
+                int (*sal_puts) (const char *s, int len);
+                int (*sal_getc) (void);
+                int (*sal_input_pending) (void);
+                void (*sal_wakeup_transmit) (struct sn_cons_port *, int);
+        } *sc_ops;
+        unsigned long sc_interrupt_timeout;
+        int sc_is_asynch;
+};
+
+static struct sn_cons_port sal_console_port;
+static int sn_process_input;
+
+/* Only used if USE_DYNAMIC_MINOR is set to 1 */
+static struct miscdevice misc;  /* used with misc_register for dynamic */
+
+extern void early_sn_setup(void);
+
+#undef DEBUG
+#ifdef DEBUG
+static int sn_debug_printf(const char *fmt, ...);
+#define DPRINTF(x...) sn_debug_printf(x)
+#else
+#define DPRINTF(x...) do { } while (0)
+#endif
+
+/* Prototypes */
+static int snt_hw_puts_raw(const char *, int);
+static int snt_hw_puts_buffered(const char *, int);
+static int snt_poll_getc(void);
+static int snt_poll_input_pending(void);
+static int snt_intr_getc(void);
+static int snt_intr_input_pending(void);
+static void sn_transmit_chars(struct sn_cons_port *, int);
+
+/* A table for polling:
+ */
+static struct sn_sal_ops poll_ops = {
+        .sal_puts_raw = snt_hw_puts_raw,
+        .sal_puts = snt_hw_puts_raw,
+        .sal_getc = snt_poll_getc,
+        .sal_input_pending = snt_poll_input_pending
+};
+
+/* A table for interrupts enabled */
+static struct sn_sal_ops intr_ops = {
+        .sal_puts_raw = snt_hw_puts_raw,
+        .sal_puts = snt_hw_puts_buffered,
+        .sal_getc = snt_intr_getc,
+        .sal_input_pending = snt_intr_input_pending,
+        .sal_wakeup_transmit = sn_transmit_chars
+};
+
+/* the console does output in two distinctly different ways:
+ * synchronous (raw) and asynchronous (buffered).  initially, early_printk
+ * does synchronous output.  any data written goes directly to the SAL
+ * to be output (incidentally, it is internally buffered by the SAL)
+ * after interrupts and timers are initialized and available for use,
+ * the console init code switches to asynchronous output.  this is
+ * also the earliest opportunity to begin polling for console input.
+ * after console initialization, console output and tty (serial port)
+ * output is buffered and sent to the SAL asynchronously (either by
+ * timer callback or by UART interrupt) */
+
+/* routines for running the console in polling mode */
+
+/**
+ * snt_poll_getc - Get a character from the console in polling mode
+ *
+ */
+static int snt_poll_getc(void)
+{
+        int ch;
+
+        ia64_sn_console_getc(&ch);
+        return ch;
+}
+
+/**
+ * snt_poll_input_pending - Check if any input is waiting - polling mode.
+ *
+ */
+static int snt_poll_input_pending(void)
+{
+        int status, input;
+
+        status = ia64_sn_console_check(&input);
+        return !status && input;
+}
+
+/* routines for an interrupt driven console (normal) */
+
+/**
+ * snt_intr_getc - Get a character from the console, interrupt mode
+ *
+ */
+static int snt_intr_getc(void)
+{
+        return ia64_sn_console_readc();
+}
+
+/**
+ * snt_intr_input_pending - Check if input is pending, interrupt mode
+ *
+ */
+static int snt_intr_input_pending(void)
+{
+        return ia64_sn_console_intr_status() & SAL_CONSOLE_INTR_RECV;
+}
+
+/* these functions are polled and interrupt */
+
+/**
+ * snt_hw_puts_raw - Send raw string to the console, polled or interrupt mode
+ * @s: String
+ * @len: Length
+ *
+ */
+static int snt_hw_puts_raw(const char *s, int len)
+{
+        /* this will call the PROM and not return until this is done */
+        return ia64_sn_console_putb(s, len);
+}
+
+/**
+ * snt_hw_puts_buffered - Send string to console, polled or interrupt mode
+ * @s: String
+ * @len: Length
+ *
+ */
+static int snt_hw_puts_buffered(const char *s, int len)
+{
+        /* queue data to the PROM */
+        return ia64_sn_console_xmit_chars((char *)s, len);
+}
+
+/* uart interface structs
+ * These functions are associated with the uart_port that the serial core
+ * infrastructure calls.
+ *
+ * Note: Due to how the console works, many routines are no-ops.
+ */
+
+/**
+ * snp_type - What type of console are we?
+ * @port: Port to operate with (we ignore since we only have one port)
+ *
+ */
+static const char *snp_type(struct uart_port *port)
+{
+        return ("SGI SN L1");
+}
+
+/**
+ * snp_tx_empty - Is the transmitter empty?  We pretend we're always empty
+ * @port: Port to operate on (we ignore since we only have one port)
+ *
+ */
+static unsigned int snp_tx_empty(struct uart_port *port)
+{
+        return 1;
+}
+
+/**
+ * snp_stop_tx - stop the transmitter - no-op for us
+ * @port: Port to operat eon - we ignore - no-op function
+ *
+ */
+static void snp_stop_tx(struct uart_port *port)
+{
+}
+
+/**
+ * snp_release_port - Free i/o and resources for port - no-op for us
+ * @port: Port to operate on - we ignore - no-op function
+ *
+ */
+static void snp_release_port(struct uart_port *port)
+{
+}
+
+/**
+ * snp_enable_ms - Force modem status interrupts on - no-op for us
+ * @port: Port to operate on - we ignore - no-op function
+ *
+ */
+static void snp_enable_ms(struct uart_port *port)
+{
+}
+
+/**
+ * snp_shutdown - shut down the port - free irq and disable - no-op for us
+ * @port: Port to shut down - we ignore
+ *
+ */
+static void snp_shutdown(struct uart_port *port)
+{
+}
+
+/**
+ * snp_set_mctrl - set control lines (dtr, rts, etc) - no-op for our console
+ * @port: Port to operate on - we ignore
+ * @mctrl: Lines to set/unset - we ignore
+ *
+ */
+static void snp_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+/**
+ * snp_get_mctrl - get contorl line info, we just return a static value
+ * @port: port to operate on - we only have one port so we ignore this
+ *
+ */
+static unsigned int snp_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CAR | TIOCM_RNG | TIOCM_DSR | TIOCM_CTS;
+}
+
+/**
+ * snp_stop_rx - Stop the receiver - we ignor ethis
+ * @port: Port to operate on - we ignore
+ *
+ */
+static void snp_stop_rx(struct uart_port *port)
+{
+}
+
+/**
+ * snp_start_tx - Start transmitter
+ * @port: Port to operate on
+ *
+ */
+static void snp_start_tx(struct uart_port *port)
+{
+        if (sal_console_port.sc_ops->sal_wakeup_transmit)
+                sal_console_port.sc_ops->sal_wakeup_transmit(&sal_console_port,
+                                                             TRANSMIT_BUFFERED);
+
+}
+
+/**
+ * snp_break_ctl - handle breaks - ignored by us
+ * @port: Port to operate on
+ * @break_state: Break state
+ *
+ */
+static void snp_break_ctl(struct uart_port *port, int break_state)
+{
+}
+
+/**
+ * snp_startup - Start up the serial port - always return 0 (We're always on)
+ * @port: Port to operate on
+ *
+ */
+static int snp_startup(struct uart_port *port)
+{
+        return 0;
+}
+
+/**
+ * snp_set_termios - set termios stuff - we ignore these
+ * @port: port to operate on
+ * @termios: New settings
+ * @termios: Old
+ *
+ */
+static void
+snp_set_termios(struct uart_port *port, struct ktermios *termios,
+                struct ktermios *old)
+{
+}
+
+/**
+ * snp_request_port - allocate resources for port - ignored by us
+ * @port: port to operate on
+ *
+ */
+static int snp_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/**
+ * snp_config_port - allocate resources, set up - we ignore,  we're always on
+ * @port: Port to operate on
+ * @flags: flags used for port setup
+ *
+ */
+static void snp_config_port(struct uart_port *port, int flags)
+{
+}
+
+/* Associate the uart functions above - given to serial core */
+
+static struct uart_ops sn_console_ops = {
+        .tx_empty = snp_tx_empty,
+        .set_mctrl = snp_set_mctrl,
+        .get_mctrl = snp_get_mctrl,
+        .stop_tx = snp_stop_tx,
+        .start_tx = snp_start_tx,
+        .stop_rx = snp_stop_rx,
+        .enable_ms = snp_enable_ms,
+        .break_ctl = snp_break_ctl,
+        .startup = snp_startup,
+        .shutdown = snp_shutdown,
+        .set_termios = snp_set_termios,
+        .pm = NULL,
+        .type = snp_type,
+        .release_port = snp_release_port,
+        .request_port = snp_request_port,
+        .config_port = snp_config_port,
+        .verify_port = NULL,
+};
+
+/* End of uart struct functions and defines */
+
+#ifdef DEBUG
+
+/**
+ * sn_debug_printf - close to hardware debugging printf
+ * @fmt: printf format
+ *
+ * This is as "close to the metal" as we can get, used when the driver
+ * itself may be broken.
+ *
+ */
+static int sn_debug_printf(const char *fmt, ...)
+{
+        static char printk_buf[1024];
+        int printed_len;
+        va_list args;
+
+        va_start(args, fmt);
+        printed_len = vsnprintf(printk_buf, sizeof(printk_buf), fmt, args);
+
+        if (!sal_console_port.sc_ops) {
+                sal_console_port.sc_ops = &poll_ops;
+                early_sn_setup();
+        }
+        sal_console_port.sc_ops->sal_puts_raw(printk_buf, printed_len);
+
+        va_end(args);
+        return printed_len;
+}
+#endif                          /* DEBUG */
+
+/*
+ * Interrupt handling routines.
+ */
+
+/**
+ * sn_receive_chars - Grab characters, pass them to tty layer
+ * @port: Port to operate on
+ * @flags: irq flags
+ *
+ * Note: If we're not registered with the serial core infrastructure yet,
+ * we don't try to send characters to it...
+ *
+ */
+static void
+sn_receive_chars(struct sn_cons_port *port, unsigned long flags)
+{
+        int ch;
+        struct tty_struct *tty;
+
+        if (!port) {
+                printk(KERN_ERR "sn_receive_chars - port NULL so can't receieve\n");
+                return;
+        }
+
+        if (!port->sc_ops) {
+                printk(KERN_ERR "sn_receive_chars - port->sc_ops  NULL so can't receieve\n");
+                return;
+        }
+
+        if (port->sc_port.state) {
+                /* The serial_core stuffs are initialized, use them */
+                tty = port->sc_port.state->port.tty;
+        }
+        else {
+                /* Not registered yet - can't pass to tty layer.  */
+                tty = NULL;
+        }
+
+        while (port->sc_ops->sal_input_pending()) {
+                ch = port->sc_ops->sal_getc();
+                if (ch < 0) {
+                        printk(KERN_ERR "sn_console: An error occurred while "
+                               "obtaining data from the console (0x%0x)\n", ch);
+                        break;
+                }
+#ifdef CONFIG_MAGIC_SYSRQ
+                if (sysrq_requested) {
+                        unsigned long sysrq_timeout = sysrq_requested + HZ*5;
+
+                        sysrq_requested = 0;
+                        if (ch && time_before(jiffies, sysrq_timeout)) {
+                                spin_unlock_irqrestore(&port->sc_port.lock, flags);
+                                handle_sysrq(ch);
+                                spin_lock_irqsave(&port->sc_port.lock, flags);
+                                /* ignore actual sysrq command char */
+                                continue;
+                        }
+                }
+                if (ch == *sysrq_serial_ptr) {
+                        if (!(*++sysrq_serial_ptr)) {
+                                sysrq_requested = jiffies;
+                                sysrq_serial_ptr = sysrq_serial_str;
+                        }
+                        /*
+                         * ignore the whole sysrq string except for the
+                         * leading escape
+                         */
+                        if (ch != '\e')
+                                continue;
+                }
+                else
+                        sysrq_serial_ptr = sysrq_serial_str;
+#endif /* CONFIG_MAGIC_SYSRQ */
+
+                /* record the character to pass up to the tty layer */
+                if (tty) {
+                        if(tty_insert_flip_char(tty, ch, TTY_NORMAL) == 0)
+                                break;
+                }
+                port->sc_port.icount.rx++;
+        }
+
+        if (tty)
+                tty_flip_buffer_push(tty);
+}
+
+/**
+ * sn_transmit_chars - grab characters from serial core, send off
+ * @port: Port to operate on
+ * @raw: Transmit raw or buffered
+ *
+ * Note: If we're early, before we're registered with serial core, the
+ * writes are going through sn_sal_console_write because that's how
+ * register_console has been set up.  We currently could have asynch
+ * polls calling this function due to sn_sal_switch_to_asynch but we can
+ * ignore them until we register with the serial core stuffs.
+ *
+ */
+static void sn_transmit_chars(struct sn_cons_port *port, int raw)
+{
+        int xmit_count, tail, head, loops, ii;
+        int result;
+        char *start;
+        struct circ_buf *xmit;
+
+        if (!port)
+                return;
+
+        BUG_ON(!port->sc_is_asynch);
+
+        if (port->sc_port.state) {
+                /* We're initialized, using serial core infrastructure */
+                xmit = &port->sc_port.state->xmit;
+        } else {
+                /* Probably sn_sal_switch_to_asynch has been run but serial core isn't
+                 * initialized yet.  Just return.  Writes are going through
+                 * sn_sal_console_write (due to register_console) at this time.
+                 */
+                return;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&port->sc_port)) {
+                /* Nothing to do. */
+                ia64_sn_console_intr_disable(SAL_CONSOLE_INTR_XMIT);
+                return;
+        }
+
+        head = xmit->head;
+        tail = xmit->tail;
+        start = &xmit->buf[tail];
+
+        /* twice around gets the tail to the end of the buffer and
+         * then to the head, if needed */
+        loops = (head < tail) ? 2 : 1;
+
+        for (ii = 0; ii < loops; ii++) {
+                xmit_count = (head < tail) ?
+                    (UART_XMIT_SIZE - tail) : (head - tail);
+
+                if (xmit_count > 0) {
+                        if (raw == TRANSMIT_RAW)
+                                result =
+                                    port->sc_ops->sal_puts_raw(start,
+                                                               xmit_count);
+                        else
+                                result =
+                                    port->sc_ops->sal_puts(start, xmit_count);
+#ifdef DEBUG
+                        if (!result)
+                                DPRINTF("`");
+#endif
+                        if (result > 0) {
+                                xmit_count -= result;
+                                port->sc_port.icount.tx += result;
+                                tail += result;
+                                tail &= UART_XMIT_SIZE - 1;
+                                xmit->tail = tail;
+                                start = &xmit->buf[tail];
+                        }
+                }
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&port->sc_port);
+
+        if (uart_circ_empty(xmit))
+                snp_stop_tx(&port->sc_port);    /* no-op for us */
+}
+
+/**
+ * sn_sal_interrupt - Handle console interrupts
+ * @irq: irq #, useful for debug statements
+ * @dev_id: our pointer to our port (sn_cons_port which contains the uart port)
+ *
+ */
+static irqreturn_t sn_sal_interrupt(int irq, void *dev_id)
+{
+        struct sn_cons_port *port = (struct sn_cons_port *)dev_id;
+        unsigned long flags;
+        int status = ia64_sn_console_intr_status();
+
+        if (!port)
+                return IRQ_NONE;
+
+        spin_lock_irqsave(&port->sc_port.lock, flags);
+        if (status & SAL_CONSOLE_INTR_RECV) {
+                sn_receive_chars(port, flags);
+        }
+        if (status & SAL_CONSOLE_INTR_XMIT) {
+                sn_transmit_chars(port, TRANSMIT_BUFFERED);
+        }
+        spin_unlock_irqrestore(&port->sc_port.lock, flags);
+        return IRQ_HANDLED;
+}
+
+/**
+ * sn_sal_timer_poll - this function handles polled console mode
+ * @data: A pointer to our sn_cons_port (which contains the uart port)
+ *
+ * data is the pointer that init_timer will store for us.  This function is
+ * associated with init_timer to see if there is any console traffic.
+ * Obviously not used in interrupt mode
+ *
+ */
+static void sn_sal_timer_poll(unsigned long data)
+{
+        struct sn_cons_port *port = (struct sn_cons_port *)data;
+        unsigned long flags;
+
+        if (!port)
+                return;
+
+        if (!port->sc_port.irq) {
+                spin_lock_irqsave(&port->sc_port.lock, flags);
+                if (sn_process_input)
+                        sn_receive_chars(port, flags);
+                sn_transmit_chars(port, TRANSMIT_RAW);
+                spin_unlock_irqrestore(&port->sc_port.lock, flags);
+                mod_timer(&port->sc_timer,
+                          jiffies + port->sc_interrupt_timeout);
+        }
+}
+
+/*
+ * Boot-time initialization code
+ */
+
+/**
+ * sn_sal_switch_to_asynch - Switch to async mode (as opposed to synch)
+ * @port: Our sn_cons_port (which contains the uart port)
+ *
+ * So this is used by sn_sal_serial_console_init (early on, before we're
+ * registered with serial core).  It's also used by sn_sal_module_init
+ * right after we've registered with serial core.  The later only happens
+ * if we didn't already come through here via sn_sal_serial_console_init.
+ *
+ */
+static void __init sn_sal_switch_to_asynch(struct sn_cons_port *port)
+{
+        unsigned long flags;
+
+        if (!port)
+                return;
+
+        DPRINTF("sn_console: about to switch to asynchronous console\n");
+
+        /* without early_printk, we may be invoked late enough to race
+         * with other cpus doing console IO at this point, however
+         * console interrupts will never be enabled */
+        spin_lock_irqsave(&port->sc_port.lock, flags);
+
+        /* early_printk invocation may have done this for us */
+        if (!port->sc_ops)
+                port->sc_ops = &poll_ops;
+
+        /* we can't turn on the console interrupt (as request_irq
+         * calls kmalloc, which isn't set up yet), so we rely on a
+         * timer to poll for input and push data from the console
+         * buffer.
+         */
+        init_timer(&port->sc_timer);
+        port->sc_timer.function = sn_sal_timer_poll;
+        port->sc_timer.data = (unsigned long)port;
+
+        if (IS_RUNNING_ON_SIMULATOR())
+                port->sc_interrupt_timeout = 6;
+        else {
+                /* 960cps / 16 char FIFO = 60HZ
+                 * HZ / (SN_SAL_FIFO_SPEED_CPS / SN_SAL_FIFO_DEPTH) */
+                port->sc_interrupt_timeout =
+                    HZ * SN_SAL_UART_FIFO_DEPTH / SN_SAL_UART_FIFO_SPEED_CPS;
+        }
+        mod_timer(&port->sc_timer, jiffies + port->sc_interrupt_timeout);
+
+        port->sc_is_asynch = 1;
+        spin_unlock_irqrestore(&port->sc_port.lock, flags);
+}
+
+/**
+ * sn_sal_switch_to_interrupts - Switch to interrupt driven mode
+ * @port: Our sn_cons_port (which contains the uart port)
+ *
+ * In sn_sal_module_init, after we're registered with serial core and
+ * the port is added, this function is called to switch us to interrupt
+ * mode.  We were previously in asynch/polling mode (using init_timer).
+ *
+ * We attempt to switch to interrupt mode here by calling
+ * request_irq.  If that works out, we enable receive interrupts.
+ */
+static void __init sn_sal_switch_to_interrupts(struct sn_cons_port *port)
+{
+        unsigned long flags;
+
+        if (port) {
+                DPRINTF("sn_console: switching to interrupt driven console\n");
+
+                if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt,
+                                IRQF_DISABLED | IRQF_SHARED,
+                                "SAL console driver", port) >= 0) {
+                        spin_lock_irqsave(&port->sc_port.lock, flags);
+                        port->sc_port.irq = SGI_UART_VECTOR;
+                        port->sc_ops = &intr_ops;
+
+                        /* turn on receive interrupts */
+                        ia64_sn_console_intr_enable(SAL_CONSOLE_INTR_RECV);
+                        spin_unlock_irqrestore(&port->sc_port.lock, flags);
+                }
+                else {
+                        printk(KERN_INFO
+                            "sn_console: console proceeding in polled mode\n");
+                }
+        }
+}
+
+/*
+ * Kernel console definitions
+ */
+
+static void sn_sal_console_write(struct console *, const char *, unsigned);
+static int sn_sal_console_setup(struct console *, char *);
+static struct uart_driver sal_console_uart;
+extern struct tty_driver *uart_console_device(struct console *, int *);
+
+static struct console sal_console = {
+        .name = DEVICE_NAME,
+        .write = sn_sal_console_write,
+        .device = uart_console_device,
+        .setup = sn_sal_console_setup,
+        .index = -1,            /* unspecified */
+        .data = &sal_console_uart,
+};
+
+#define SAL_CONSOLE     &sal_console
+
+static struct uart_driver sal_console_uart = {
+        .owner = THIS_MODULE,
+        .driver_name = "sn_console",
+        .dev_name = DEVICE_NAME,
+        .major = 0,             /* major/minor set at registration time per USE_DYNAMIC_MINOR */
+        .minor = 0,
+        .nr = 1,                /* one port */
+        .cons = SAL_CONSOLE,
+};
+
+/**
+ * sn_sal_module_init - When the kernel loads us, get us rolling w/ serial core
+ *
+ * Before this is called, we've been printing kernel messages in a special
+ * early mode not making use of the serial core infrastructure.  When our
+ * driver is loaded for real, we register the driver and port with serial
+ * core and try to enable interrupt driven mode.
+ *
+ */
+static int __init sn_sal_module_init(void)
+{
+        int retval;
+
+        if (!ia64_platform_is("sn2"))
+                return 0;
+
+        printk(KERN_INFO "sn_console: Console driver init\n");
+
+        if (USE_DYNAMIC_MINOR == 1) {
+                misc.minor = MISC_DYNAMIC_MINOR;
+                misc.name = DEVICE_NAME_DYNAMIC;
+                retval = misc_register(&misc);
+                if (retval != 0) {
+                        printk(KERN_WARNING "Failed to register console "
+                               "device using misc_register.\n");
+                        return -ENODEV;
+                }
+                sal_console_uart.major = MISC_MAJOR;
+                sal_console_uart.minor = misc.minor;
+        } else {
+                sal_console_uart.major = DEVICE_MAJOR;
+                sal_console_uart.minor = DEVICE_MINOR;
+        }
+
+        /* We register the driver and the port before switching to interrupts
+         * or async above so the proper uart structures are populated */
+
+        if (uart_register_driver(&sal_console_uart) < 0) {
+                printk
+                    ("ERROR sn_sal_module_init failed uart_register_driver, line %d\n",
+                     __LINE__);
+                return -ENODEV;
+        }
+
+        spin_lock_init(&sal_console_port.sc_port.lock);
+
+        /* Setup the port struct with the minimum needed */
+        sal_console_port.sc_port.membase = (char *)1;   /* just needs to be non-zero */
+        sal_console_port.sc_port.type = PORT_16550A;
+        sal_console_port.sc_port.fifosize = SN_SAL_MAX_CHARS;
+        sal_console_port.sc_port.ops = &sn_console_ops;
+        sal_console_port.sc_port.line = 0;
+
+        if (uart_add_one_port(&sal_console_uart, &sal_console_port.sc_port) < 0) {
+                /* error - not sure what I'd do - so I'll do nothing */
+                printk(KERN_ERR "%s: unable to add port\n", __func__);
+        }
+
+        /* when this driver is compiled in, the console initialization
+         * will have already switched us into asynchronous operation
+         * before we get here through the module initcalls */
+        if (!sal_console_port.sc_is_asynch) {
+                sn_sal_switch_to_asynch(&sal_console_port);
+        }
+
+        /* at this point (module_init) we can try to turn on interrupts */
+        if (!IS_RUNNING_ON_SIMULATOR()) {
+                sn_sal_switch_to_interrupts(&sal_console_port);
+        }
+        sn_process_input = 1;
+        return 0;
+}
+
+/**
+ * sn_sal_module_exit - When we're unloaded, remove the driver/port
+ *
+ */
+static void __exit sn_sal_module_exit(void)
+{
+        del_timer_sync(&sal_console_port.sc_timer);
+        uart_remove_one_port(&sal_console_uart, &sal_console_port.sc_port);
+        uart_unregister_driver(&sal_console_uart);
+        misc_deregister(&misc);
+}
+
+module_init(sn_sal_module_init);
+module_exit(sn_sal_module_exit);
+
+/**
+ * puts_raw_fixed - sn_sal_console_write helper for adding \r's as required
+ * @puts_raw : puts function to do the writing
+ * @s: input string
+ * @count: length
+ *
+ * We need a \r ahead of every \n for direct writes through
+ * ia64_sn_console_putb (what sal_puts_raw below actually does).
+ *
+ */
+
+static void puts_raw_fixed(int (*puts_raw) (const char *s, int len),
+                           const char *s, int count)
+{
+        const char *s1;
+
+        /* Output '\r' before each '\n' */
+        while ((s1 = memchr(s, '\n', count)) != NULL) {
+                puts_raw(s, s1 - s);
+                puts_raw("\r\n", 2);
+                count -= s1 + 1 - s;
+                s = s1 + 1;
+        }
+        puts_raw(s, count);
+}
+
+/**
+ * sn_sal_console_write - Print statements before serial core available
+ * @console: Console to operate on - we ignore since we have just one
+ * @s: String to send
+ * @count: length
+ *
+ * This is referenced in the console struct.  It is used for early
+ * console printing before we register with serial core and for things
+ * such as kdb.  The console_lock must be held when we get here.
+ *
+ * This function has some code for trying to print output even if the lock
+ * is held.  We try to cover the case where a lock holder could have died.
+ * We don't use this special case code if we're not registered with serial
+ * core yet.  After we're registered with serial core, the only time this
+ * function would be used is for high level kernel output like magic sys req,
+ * kdb, and printk's.
+ */
+static void
+sn_sal_console_write(struct console *co, const char *s, unsigned count)
+{
+        unsigned long flags = 0;
+        struct sn_cons_port *port = &sal_console_port;
+        static int stole_lock = 0;
+
+        BUG_ON(!port->sc_is_asynch);
+
+        /* We can't look at the xmit buffer if we're not registered with serial core
+         *  yet.  So only do the fancy recovery after registering
+         */
+        if (!port->sc_port.state) {
+                /* Not yet registered with serial core - simple case */
+                puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
+                return;
+        }
+
+        /* somebody really wants this output, might be an
+         * oops, kdb, panic, etc.  make sure they get it. */
+        if (spin_is_locked(&port->sc_port.lock)) {
+                int lhead = port->sc_port.state->xmit.head;
+                int ltail = port->sc_port.state->xmit.tail;
+                int counter, got_lock = 0;
+
+                /*
+                 * We attempt to determine if someone has died with the
+                 * lock. We wait ~20 secs after the head and tail ptrs
+                 * stop moving and assume the lock holder is not functional
+                 * and plow ahead. If the lock is freed within the time out
+                 * period we re-get the lock and go ahead normally. We also
+                 * remember if we have plowed ahead so that we don't have
+                 * to wait out the time out period again - the asumption
+                 * is that we will time out again.
+                 */
+
+                for (counter = 0; counter < 150; mdelay(125), counter++) {
+                        if (!spin_is_locked(&port->sc_port.lock)
+                            || stole_lock) {
+                                if (!stole_lock) {
+                                        spin_lock_irqsave(&port->sc_port.lock,
+                                                          flags);
+                                        got_lock = 1;
+                                }
+                                break;
+                        } else {
+                                /* still locked */
+                                if ((lhead != port->sc_port.state->xmit.head)
+                                    || (ltail !=
+                                        port->sc_port.state->xmit.tail)) {
+                                        lhead =
+                                                port->sc_port.state->xmit.head;
+                                        ltail =
+                                                port->sc_port.state->xmit.tail;
+                                        counter = 0;
+                                }
+                        }
+                }
+                /* flush anything in the serial core xmit buffer, raw */
+                sn_transmit_chars(port, 1);
+                if (got_lock) {
+                        spin_unlock_irqrestore(&port->sc_port.lock, flags);
+                        stole_lock = 0;
+                } else {
+                        /* fell thru */
+                        stole_lock = 1;
+                }
+                puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
+        } else {
+                stole_lock = 0;
+                spin_lock_irqsave(&port->sc_port.lock, flags);
+                sn_transmit_chars(port, 1);
+                spin_unlock_irqrestore(&port->sc_port.lock, flags);
+
+                puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
+        }
+}
+
+
+/**
+ * sn_sal_console_setup - Set up console for early printing
+ * @co: Console to work with
+ * @options: Options to set
+ *
+ * Altix console doesn't do anything with baud rates, etc, anyway.
+ *
+ * This isn't required since not providing the setup function in the
+ * console struct is ok.  However, other patches like KDB plop something
+ * here so providing it is easier.
+ *
+ */
+static int sn_sal_console_setup(struct console *co, char *options)
+{
+        return 0;
+}
+
+/**
+ * sn_sal_console_write_early - simple early output routine
+ * @co - console struct
+ * @s - string to print
+ * @count - count
+ *
+ * Simple function to provide early output, before even
+ * sn_sal_serial_console_init is called.  Referenced in the
+ * console struct registerd in sn_serial_console_early_setup.
+ *
+ */
+static void __init
+sn_sal_console_write_early(struct console *co, const char *s, unsigned count)
+{
+        puts_raw_fixed(sal_console_port.sc_ops->sal_puts_raw, s, count);
+}
+
+/* Used for very early console printing - again, before
+ * sn_sal_serial_console_init is run */
+static struct console sal_console_early __initdata = {
+        .name = "sn_sal",
+        .write = sn_sal_console_write_early,
+        .flags = CON_PRINTBUFFER,
+        .index = -1,
+};
+
+/**
+ * sn_serial_console_early_setup - Sets up early console output support
+ *
+ * Register a console early on...  This is for output before even
+ * sn_sal_serial_cosnole_init is called.  This function is called from
+ * setup.c.  This allows us to do really early polled writes. When
+ * sn_sal_serial_console_init is called, this console is unregistered
+ * and a new one registered.
+ */
+int __init sn_serial_console_early_setup(void)
+{
+        if (!ia64_platform_is("sn2"))
+                return -1;
+
+        sal_console_port.sc_ops = &poll_ops;
+        spin_lock_init(&sal_console_port.sc_port.lock);
+        early_sn_setup();       /* Find SAL entry points */
+        register_console(&sal_console_early);
+
+        return 0;
+}
+
+/**
+ * sn_sal_serial_console_init - Early console output - set up for register
+ *
+ * This function is called when regular console init happens.  Because we
+ * support even earlier console output with sn_serial_console_early_setup
+ * (called from setup.c directly), this function unregisters the really
+ * early console.
+ *
+ * Note: Even if setup.c doesn't register sal_console_early, unregistering
+ * it here doesn't hurt anything.
+ *
+ */
+static int __init sn_sal_serial_console_init(void)
+{
+        if (ia64_platform_is("sn2")) {
+                sn_sal_switch_to_asynch(&sal_console_port);
+                DPRINTF("sn_sal_serial_console_init : register console\n");
+                register_console(&sal_console);
+                unregister_console(&sal_console_early);
+        }
+        return 0;
+}
+
+console_initcall(sn_sal_serial_console_init);
diff --git a/drivers/tty/serial/suncore.c b/drivers/tty/serial/suncore.c
new file mode 100644
index 000000000000..6381a0282ee7
--- /dev/null
+++ b/drivers/tty/serial/suncore.c
@@ -0,0 +1,247 @@
+/* suncore.c
+ *
+ * Common SUN serial routines.  Based entirely
+ * upon drivers/sbus/char/sunserial.c which is:
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ *
+ * Adaptation to new UART layer is:
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/serial_core.h>
+#include <linux/init.h>
+
+#include <asm/prom.h>
+
+#include "suncore.h"
+
+static int sunserial_current_minor = 64;
+
+int sunserial_register_minors(struct uart_driver *drv, int count)
+{
+        int err = 0;
+
+        drv->minor = sunserial_current_minor;
+        drv->nr += count;
+        /* Register the driver on the first call */
+        if (drv->nr == count)
+                err = uart_register_driver(drv);
+        if (err == 0) {
+                sunserial_current_minor += count;
+                drv->tty_driver->name_base = drv->minor - 64;
+        }
+        return err;
+}
+EXPORT_SYMBOL(sunserial_register_minors);
+
+void sunserial_unregister_minors(struct uart_driver *drv, int count)
+{
+        drv->nr -= count;
+        sunserial_current_minor -= count;
+
+        if (drv->nr == 0)
+                uart_unregister_driver(drv);
+}
+EXPORT_SYMBOL(sunserial_unregister_minors);
+
+int sunserial_console_match(struct console *con, struct device_node *dp,
+                            struct uart_driver *drv, int line, bool ignore_line)
+{
+        if (!con)
+                return 0;
+
+        drv->cons = con;
+
+        if (of_console_device != dp)
+                return 0;
+
+        if (!ignore_line) {
+                int off = 0;
+
+                if (of_console_options &&
+                    *of_console_options == 'b')
+                        off = 1;
+
+                if ((line & 1) != off)
+                        return 0;
+        }
+
+        if (!console_set_on_cmdline) {
+                con->index = line;
+                add_preferred_console(con->name, line, NULL);
+        }
+        return 1;
+}
+EXPORT_SYMBOL(sunserial_console_match);
+
+void sunserial_console_termios(struct console *con, struct device_node *uart_dp)
+{
+        const char *mode, *s;
+        char mode_prop[] = "ttyX-mode";
+        int baud, bits, stop, cflag;
+        char parity;
+
+        if (!strcmp(uart_dp->name, "rsc") ||
+            !strcmp(uart_dp->name, "rsc-console") ||
+            !strcmp(uart_dp->name, "rsc-control")) {
+                mode = of_get_property(uart_dp,
+                                       "ssp-console-modes", NULL);
+                if (!mode)
+                        mode = "115200,8,n,1,-";
+        } else if (!strcmp(uart_dp->name, "lom-console")) {
+                mode = "9600,8,n,1,-";
+        } else {
+                struct device_node *dp;
+                char c;
+
+                c = 'a';
+                if (of_console_options)
+                        c = *of_console_options;
+
+                mode_prop[3] = c;
+
+                dp = of_find_node_by_path("/options");
+                mode = of_get_property(dp, mode_prop, NULL);
+                if (!mode)
+                        mode = "9600,8,n,1,-";
+        }
+
+        cflag = CREAD | HUPCL | CLOCAL;
+
+        s = mode;
+        baud = simple_strtoul(s, NULL, 0);
+        s = strchr(s, ',');
+        bits = simple_strtoul(++s, NULL, 0);
+        s = strchr(s, ',');
+        parity = *(++s);
+        s = strchr(s, ',');
+        stop = simple_strtoul(++s, NULL, 0);
+        s = strchr(s, ',');
+        /* XXX handshake is not handled here. */
+
+        switch (baud) {
+                case 150: cflag |= B150; break;
+                case 300: cflag |= B300; break;
+                case 600: cflag |= B600; break;
+                case 1200: cflag |= B1200; break;
+                case 2400: cflag |= B2400; break;
+                case 4800: cflag |= B4800; break;
+                case 9600: cflag |= B9600; break;
+                case 19200: cflag |= B19200; break;
+                case 38400: cflag |= B38400; break;
+                case 57600: cflag |= B57600; break;
+                case 115200: cflag |= B115200; break;
+                case 230400: cflag |= B230400; break;
+                case 460800: cflag |= B460800; break;
+                default: baud = 9600; cflag |= B9600; break;
+        }
+
+        switch (bits) {
+                case 5: cflag |= CS5; break;
+                case 6: cflag |= CS6; break;
+                case 7: cflag |= CS7; break;
+                case 8: cflag |= CS8; break;
+                default: cflag |= CS8; break;
+        }
+
+        switch (parity) {
+                case 'o': cflag |= (PARENB | PARODD); break;
+                case 'e': cflag |= PARENB; break;
+                case 'n': default: break;
+        }
+
+        switch (stop) {
+                case 2: cflag |= CSTOPB; break;
+                case 1: default: break;
+        }
+
+        con->cflag = cflag;
+}
+
+/* Sun serial MOUSE auto baud rate detection.  */
+static struct mouse_baud_cflag {
+        int baud;
+        unsigned int cflag;
+} mouse_baud_table[] = {
+        { 1200, B1200 },
+        { 2400, B2400 },
+        { 4800, B4800 },
+        { 9600, B9600 },
+        { -1, ~0 },
+        { -1, ~0 },
+};
+
+unsigned int suncore_mouse_baud_cflag_next(unsigned int cflag, int *new_baud)
+{
+        int i;
+
+        for (i = 0; mouse_baud_table[i].baud != -1; i++)
+                if (mouse_baud_table[i].cflag == (cflag & CBAUD))
+                        break;
+
+        i += 1;
+        if (mouse_baud_table[i].baud == -1)
+                i = 0;
+
+        *new_baud = mouse_baud_table[i].baud;
+        return mouse_baud_table[i].cflag;
+}
+
+EXPORT_SYMBOL(suncore_mouse_baud_cflag_next);
+
+/* Basically, when the baud rate is wrong the mouse spits out
+ * breaks to us.
+ */
+int suncore_mouse_baud_detection(unsigned char ch, int is_break)
+{
+        static int mouse_got_break = 0;
+        static int ctr = 0;
+
+        if (is_break) {
+                /* Let a few normal bytes go by before we jump the gun
+                 * and say we need to try another baud rate.
+                 */
+                if (mouse_got_break && ctr < 8)
+                        return 1;
+
+                /* Ok, we need to try another baud. */
+                ctr = 0;
+                mouse_got_break = 1;
+                return 2;
+        }
+        if (mouse_got_break) {
+                ctr++;
+                if (ch == 0x87) {
+                        /* Correct baud rate determined. */
+                        mouse_got_break = 0;
+                }
+                return 1;
+        }
+        return 0;
+}
+
+EXPORT_SYMBOL(suncore_mouse_baud_detection);
+
+static int __init suncore_init(void)
+{
+        return 0;
+}
+
+static void __exit suncore_exit(void)
+{
+}
+
+module_init(suncore_init);
+module_exit(suncore_exit);
+
+MODULE_AUTHOR("Eddie C. Dost, David S. Miller");
+MODULE_DESCRIPTION("Sun serial common layer");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/suncore.h b/drivers/tty/serial/suncore.h
new file mode 100644
index 000000000000..db2057936c31
--- /dev/null
+++ b/drivers/tty/serial/suncore.h
@@ -0,0 +1,33 @@
+/* suncore.h
+ *
+ * Generic SUN serial/kbd/ms layer.  Based entirely
+ * upon drivers/sbus/char/sunserial.h which is:
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ *
+ * Port to new UART layer is:
+ *
+ * Copyright (C) 2002 David S. Miller (davem@redhat.com)
+ */
+
+#ifndef _SERIAL_SUN_H
+#define _SERIAL_SUN_H
+
+/* Serial keyboard defines for L1-A processing... */
+#define SUNKBD_RESET            0xff
+#define SUNKBD_L1               0x01
+#define SUNKBD_UP               0x80
+#define SUNKBD_A                0x4d
+
+extern unsigned int suncore_mouse_baud_cflag_next(unsigned int, int *);
+extern int suncore_mouse_baud_detection(unsigned char, int);
+
+extern int sunserial_register_minors(struct uart_driver *, int);
+extern void sunserial_unregister_minors(struct uart_driver *, int);
+
+extern int sunserial_console_match(struct console *, struct device_node *,
+                                   struct uart_driver *, int, bool);
+extern void sunserial_console_termios(struct console *,
+                                      struct device_node *);
+
+#endif /* !(_SERIAL_SUN_H) */
diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c
new file mode 100644
index 000000000000..c0b7246d7339
--- /dev/null
+++ b/drivers/tty/serial/sunhv.c
@@ -0,0 +1,661 @@
+/* sunhv.c: Serial driver for SUN4V hypervisor console.
+ *
+ * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/of_device.h>
+
+#include <asm/hypervisor.h>
+#include <asm/spitfire.h>
+#include <asm/prom.h>
+#include <asm/irq.h>
+
+#if defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#include "suncore.h"
+
+#define CON_BREAK       ((long)-1)
+#define CON_HUP         ((long)-2)
+
+#define IGNORE_BREAK    0x1
+#define IGNORE_ALL      0x2
+
+static char *con_write_page;
+static char *con_read_page;
+
+static int hung_up = 0;
+
+static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit)
+{
+        while (!uart_circ_empty(xmit)) {
+                long status = sun4v_con_putchar(xmit->buf[xmit->tail]);
+
+                if (status != HV_EOK)
+                        break;
+
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+}
+
+static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit)
+{
+        while (!uart_circ_empty(xmit)) {
+                unsigned long ra = __pa(xmit->buf + xmit->tail);
+                unsigned long len, status, sent;
+
+                len = CIRC_CNT_TO_END(xmit->head, xmit->tail,
+                                      UART_XMIT_SIZE);
+                status = sun4v_con_write(ra, len, &sent);
+                if (status != HV_EOK)
+                        break;
+                xmit->tail = (xmit->tail + sent) & (UART_XMIT_SIZE - 1);
+                port->icount.tx += sent;
+        }
+}
+
+static int receive_chars_getchar(struct uart_port *port, struct tty_struct *tty)
+{
+        int saw_console_brk = 0;
+        int limit = 10000;
+
+        while (limit-- > 0) {
+                long status;
+                long c = sun4v_con_getchar(&status);
+
+                if (status == HV_EWOULDBLOCK)
+                        break;
+
+                if (c == CON_BREAK) {
+                        if (uart_handle_break(port))
+                                continue;
+                        saw_console_brk = 1;
+                        c = 0;
+                }
+
+                if (c == CON_HUP) {
+                        hung_up = 1;
+                        uart_handle_dcd_change(port, 0);
+                } else if (hung_up) {
+                        hung_up = 0;
+                        uart_handle_dcd_change(port, 1);
+                }
+
+                if (tty == NULL) {
+                        uart_handle_sysrq_char(port, c);
+                        continue;
+                }
+
+                port->icount.rx++;
+
+                if (uart_handle_sysrq_char(port, c))
+                        continue;
+
+                tty_insert_flip_char(tty, c, TTY_NORMAL);
+        }
+
+        return saw_console_brk;
+}
+
+static int receive_chars_read(struct uart_port *port, struct tty_struct *tty)
+{
+        int saw_console_brk = 0;
+        int limit = 10000;
+
+        while (limit-- > 0) {
+                unsigned long ra = __pa(con_read_page);
+                unsigned long bytes_read, i;
+                long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read);
+
+                if (stat != HV_EOK) {
+                        bytes_read = 0;
+
+                        if (stat == CON_BREAK) {
+                                if (uart_handle_break(port))
+                                        continue;
+                                saw_console_brk = 1;
+                                *con_read_page = 0;
+                                bytes_read = 1;
+                        } else if (stat == CON_HUP) {
+                                hung_up = 1;
+                                uart_handle_dcd_change(port, 0);
+                                continue;
+                        } else {
+                                /* HV_EWOULDBLOCK, etc.  */
+                                break;
+                        }
+                }
+
+                if (hung_up) {
+                        hung_up = 0;
+                        uart_handle_dcd_change(port, 1);
+                }
+
+                for (i = 0; i < bytes_read; i++)
+                        uart_handle_sysrq_char(port, con_read_page[i]);
+
+                if (tty == NULL)
+                        continue;
+
+                port->icount.rx += bytes_read;
+
+                tty_insert_flip_string(tty, con_read_page, bytes_read);
+        }
+
+        return saw_console_brk;
+}
+
+struct sunhv_ops {
+        void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit);
+        int (*receive_chars)(struct uart_port *port, struct tty_struct *tty);
+};
+
+static struct sunhv_ops bychar_ops = {
+        .transmit_chars = transmit_chars_putchar,
+        .receive_chars = receive_chars_getchar,
+};
+
+static struct sunhv_ops bywrite_ops = {
+        .transmit_chars = transmit_chars_write,
+        .receive_chars = receive_chars_read,
+};
+
+static struct sunhv_ops *sunhv_ops = &bychar_ops;
+
+static struct tty_struct *receive_chars(struct uart_port *port)
+{
+        struct tty_struct *tty = NULL;
+
+        if (port->state != NULL)                /* Unopened serial console */
+                tty = port->state->port.tty;
+
+        if (sunhv_ops->receive_chars(port, tty))
+                sun_do_break();
+
+        return tty;
+}
+
+static void transmit_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit;
+
+        if (!port->state)
+                return;
+
+        xmit = &port->state->xmit;
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+                return;
+
+        sunhv_ops->transmit_chars(port, xmit);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+}
+
+static irqreturn_t sunhv_interrupt(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        struct tty_struct *tty;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        tty = receive_chars(port);
+        transmit_chars(port);
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        if (tty)
+                tty_flip_buffer_push(tty);
+
+        return IRQ_HANDLED;
+}
+
+/* port->lock is not held.  */
+static unsigned int sunhv_tx_empty(struct uart_port *port)
+{
+        /* Transmitter is always empty for us.  If the circ buffer
+         * is non-empty or there is an x_char pending, our caller
+         * will do the right thing and ignore what we return here.
+         */
+        return TIOCSER_TEMT;
+}
+
+/* port->lock held by caller.  */
+static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        return;
+}
+
+/* port->lock is held by caller and interrupts are disabled.  */
+static unsigned int sunhv_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
+}
+
+/* port->lock held by caller.  */
+static void sunhv_stop_tx(struct uart_port *port)
+{
+        return;
+}
+
+/* port->lock held by caller.  */
+static void sunhv_start_tx(struct uart_port *port)
+{
+        transmit_chars(port);
+}
+
+/* port->lock is not held.  */
+static void sunhv_send_xchar(struct uart_port *port, char ch)
+{
+        unsigned long flags;
+        int limit = 10000;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        while (limit-- > 0) {
+                long status = sun4v_con_putchar(ch);
+                if (status == HV_EOK)
+                        break;
+                udelay(1);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/* port->lock held by caller.  */
+static void sunhv_stop_rx(struct uart_port *port)
+{
+}
+
+/* port->lock held by caller.  */
+static void sunhv_enable_ms(struct uart_port *port)
+{
+}
+
+/* port->lock is not held.  */
+static void sunhv_break_ctl(struct uart_port *port, int break_state)
+{
+        if (break_state) {
+                unsigned long flags;
+                int limit = 10000;
+
+                spin_lock_irqsave(&port->lock, flags);
+
+                while (limit-- > 0) {
+                        long status = sun4v_con_putchar(CON_BREAK);
+                        if (status == HV_EOK)
+                                break;
+                        udelay(1);
+                }
+
+                spin_unlock_irqrestore(&port->lock, flags);
+        }
+}
+
+/* port->lock is not held.  */
+static int sunhv_startup(struct uart_port *port)
+{
+        return 0;
+}
+
+/* port->lock is not held.  */
+static void sunhv_shutdown(struct uart_port *port)
+{
+}
+
+/* port->lock is not held.  */
+static void sunhv_set_termios(struct uart_port *port, struct ktermios *termios,
+                              struct ktermios *old)
+{
+        unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
+        unsigned int quot = uart_get_divisor(port, baud);
+        unsigned int iflag, cflag;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        iflag = termios->c_iflag;
+        cflag = termios->c_cflag;
+
+        port->ignore_status_mask = 0;
+        if (iflag & IGNBRK)
+                port->ignore_status_mask |= IGNORE_BREAK;
+        if ((cflag & CREAD) == 0)
+                port->ignore_status_mask |= IGNORE_ALL;
+
+        /* XXX */
+        uart_update_timeout(port, cflag,
+                            (port->uartclk / (16 * quot)));
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *sunhv_type(struct uart_port *port)
+{
+        return "SUN4V HCONS";
+}
+
+static void sunhv_release_port(struct uart_port *port)
+{
+}
+
+static int sunhv_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void sunhv_config_port(struct uart_port *port, int flags)
+{
+}
+
+static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+static struct uart_ops sunhv_pops = {
+        .tx_empty       = sunhv_tx_empty,
+        .set_mctrl      = sunhv_set_mctrl,
+        .get_mctrl      = sunhv_get_mctrl,
+        .stop_tx        = sunhv_stop_tx,
+        .start_tx       = sunhv_start_tx,
+        .send_xchar     = sunhv_send_xchar,
+        .stop_rx        = sunhv_stop_rx,
+        .enable_ms      = sunhv_enable_ms,
+        .break_ctl      = sunhv_break_ctl,
+        .startup        = sunhv_startup,
+        .shutdown       = sunhv_shutdown,
+        .set_termios    = sunhv_set_termios,
+        .type           = sunhv_type,
+        .release_port   = sunhv_release_port,
+        .request_port   = sunhv_request_port,
+        .config_port    = sunhv_config_port,
+        .verify_port    = sunhv_verify_port,
+};
+
+static struct uart_driver sunhv_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "sunhv",
+        .dev_name               = "ttyS",
+        .major                  = TTY_MAJOR,
+};
+
+static struct uart_port *sunhv_port;
+
+/* Copy 's' into the con_write_page, decoding "\n" into
+ * "\r\n" along the way.  We have to return two lengths
+ * because the caller needs to know how much to advance
+ * 's' and also how many bytes to output via con_write_page.
+ */
+static int fill_con_write_page(const char *s, unsigned int n,
+                               unsigned long *page_bytes)
+{
+        const char *orig_s = s;
+        char *p = con_write_page;
+        int left = PAGE_SIZE;
+
+        while (n--) {
+                if (*s == '\n') {
+                        if (left < 2)
+                                break;
+                        *p++ = '\r';
+                        left--;
+                } else if (left < 1)
+                        break;
+                *p++ = *s++;
+                left--;
+        }
+        *page_bytes = p - con_write_page;
+        return s - orig_s;
+}
+
+static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n)
+{
+        struct uart_port *port = sunhv_port;
+        unsigned long flags;
+        int locked = 1;
+
+        local_irq_save(flags);
+        if (port->sysrq) {
+                locked = 0;
+        } else if (oops_in_progress) {
+                locked = spin_trylock(&port->lock);
+        } else
+                spin_lock(&port->lock);
+
+        while (n > 0) {
+                unsigned long ra = __pa(con_write_page);
+                unsigned long page_bytes;
+                unsigned int cpy = fill_con_write_page(s, n,
+                                                       &page_bytes);
+
+                n -= cpy;
+                s += cpy;
+                while (page_bytes > 0) {
+                        unsigned long written;
+                        int limit = 1000000;
+
+                        while (limit--) {
+                                unsigned long stat;
+
+                                stat = sun4v_con_write(ra, page_bytes,
+                                                       &written);
+                                if (stat == HV_EOK)
+                                        break;
+                                udelay(1);
+                        }
+                        if (limit < 0)
+                                break;
+                        page_bytes -= written;
+                        ra += written;
+                }
+        }
+
+        if (locked)
+                spin_unlock(&port->lock);
+        local_irq_restore(flags);
+}
+
+static inline void sunhv_console_putchar(struct uart_port *port, char c)
+{
+        int limit = 1000000;
+
+        while (limit-- > 0) {
+                long status = sun4v_con_putchar(c);
+                if (status == HV_EOK)
+                        break;
+                udelay(1);
+        }
+}
+
+static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n)
+{
+        struct uart_port *port = sunhv_port;
+        unsigned long flags;
+        int i, locked = 1;
+
+        local_irq_save(flags);
+        if (port->sysrq) {
+                locked = 0;
+        } else if (oops_in_progress) {
+                locked = spin_trylock(&port->lock);
+        } else
+                spin_lock(&port->lock);
+
+        for (i = 0; i < n; i++) {
+                if (*s == '\n')
+                        sunhv_console_putchar(port, '\r');
+                sunhv_console_putchar(port, *s++);
+        }
+
+        if (locked)
+                spin_unlock(&port->lock);
+        local_irq_restore(flags);
+}
+
+static struct console sunhv_console = {
+        .name   =       "ttyHV",
+        .write  =       sunhv_console_write_bychar,
+        .device =       uart_console_device,
+        .flags  =       CON_PRINTBUFFER,
+        .index  =       -1,
+        .data   =       &sunhv_reg,
+};
+
+static int __devinit hv_probe(struct platform_device *op)
+{
+        struct uart_port *port;
+        unsigned long minor;
+        int err;
+
+        if (op->archdata.irqs[0] == 0xffffffff)
+                return -ENODEV;
+
+        port = kzalloc(sizeof(struct uart_port), GFP_KERNEL);
+        if (unlikely(!port))
+                return -ENOMEM;
+
+        minor = 1;
+        if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 &&
+            minor >= 1) {
+                err = -ENOMEM;
+                con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
+                if (!con_write_page)
+                        goto out_free_port;
+
+                con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
+                if (!con_read_page)
+                        goto out_free_con_write_page;
+
+                sunhv_console.write = sunhv_console_write_paged;
+                sunhv_ops = &bywrite_ops;
+        }
+
+        sunhv_port = port;
+
+        port->line = 0;
+        port->ops = &sunhv_pops;
+        port->type = PORT_SUNHV;
+        port->uartclk = ( 29491200 / 16 ); /* arbitrary */
+
+        port->membase = (unsigned char __iomem *) __pa(port);
+
+        port->irq = op->archdata.irqs[0];
+
+        port->dev = &op->dev;
+
+        err = sunserial_register_minors(&sunhv_reg, 1);
+        if (err)
+                goto out_free_con_read_page;
+
+        sunserial_console_match(&sunhv_console, op->dev.of_node,
+                                &sunhv_reg, port->line, false);
+
+        err = uart_add_one_port(&sunhv_reg, port);
+        if (err)
+                goto out_unregister_driver;
+
+        err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port);
+        if (err)
+                goto out_remove_port;
+
+        dev_set_drvdata(&op->dev, port);
+
+        return 0;
+
+out_remove_port:
+        uart_remove_one_port(&sunhv_reg, port);
+
+out_unregister_driver:
+        sunserial_unregister_minors(&sunhv_reg, 1);
+
+out_free_con_read_page:
+        kfree(con_read_page);
+
+out_free_con_write_page:
+        kfree(con_write_page);
+
+out_free_port:
+        kfree(port);
+        sunhv_port = NULL;
+        return err;
+}
+
+static int __devexit hv_remove(struct platform_device *dev)
+{
+        struct uart_port *port = dev_get_drvdata(&dev->dev);
+
+        free_irq(port->irq, port);
+
+        uart_remove_one_port(&sunhv_reg, port);
+
+        sunserial_unregister_minors(&sunhv_reg, 1);
+
+        kfree(port);
+        sunhv_port = NULL;
+
+        dev_set_drvdata(&dev->dev, NULL);
+
+        return 0;
+}
+
+static const struct of_device_id hv_match[] = {
+        {
+                .name = "console",
+                .compatible = "qcn",
+        },
+        {
+                .name = "console",
+                .compatible = "SUNW,sun4v-console",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, hv_match);
+
+static struct platform_driver hv_driver = {
+        .driver = {
+                .name = "hv",
+                .owner = THIS_MODULE,
+                .of_match_table = hv_match,
+        },
+        .probe          = hv_probe,
+        .remove         = __devexit_p(hv_remove),
+};
+
+static int __init sunhv_init(void)
+{
+        if (tlb_type != hypervisor)
+                return -ENODEV;
+
+        return platform_driver_register(&hv_driver);
+}
+
+static void __exit sunhv_exit(void)
+{
+        platform_driver_unregister(&hv_driver);
+}
+
+module_init(sunhv_init);
+module_exit(sunhv_exit);
+
+MODULE_AUTHOR("David S. Miller");
+MODULE_DESCRIPTION("SUN4V Hypervisor console driver");
+MODULE_VERSION("2.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
new file mode 100644
index 000000000000..b5fa2a57b9da
--- /dev/null
+++ b/drivers/tty/serial/sunsab.c
@@ -0,0 +1,1152 @@
+/* sunsab.c: ASYNC Driver for the SIEMENS SAB82532 DUSCC.
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ * Copyright (C) 2002, 2006  David S. Miller (davem@davemloft.net)
+ *
+ * Rewrote buffer handling to use CIRC(Circular Buffer) macros.
+ *   Maxim Krasnyanskiy <maxk@qualcomm.com>
+ *
+ * Fixed to use tty_get_baud_rate, and to allow for arbitrary baud
+ * rates to be programmed into the UART.  Also eliminated a lot of
+ * duplicated code in the console setup.
+ *   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
+ *
+ * Ported to new 2.5.x UART layer.
+ *   David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/of_device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+
+#if defined(CONFIG_SERIAL_SUNSAB_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#include "suncore.h"
+#include "sunsab.h"
+
+struct uart_sunsab_port {
+        struct uart_port                port;           /* Generic UART port    */
+        union sab82532_async_regs       __iomem *regs;  /* Chip registers       */
+        unsigned long                   irqflags;       /* IRQ state flags      */
+        int                             dsr;            /* Current DSR state    */
+        unsigned int                    cec_timeout;    /* Chip poll timeout... */
+        unsigned int                    tec_timeout;    /* likewise             */
+        unsigned char                   interrupt_mask0;/* ISR0 masking         */
+        unsigned char                   interrupt_mask1;/* ISR1 masking         */
+        unsigned char                   pvr_dtr_bit;    /* Which PVR bit is DTR */
+        unsigned char                   pvr_dsr_bit;    /* Which PVR bit is DSR */
+        unsigned int                    gis_shift;
+        int                             type;           /* SAB82532 version     */
+
+        /* Setting configuration bits while the transmitter is active
+         * can cause garbage characters to get emitted by the chip.
+         * Therefore, we cache such writes here and do the real register
+         * write the next time the transmitter becomes idle.
+         */
+        unsigned int                    cached_ebrg;
+        unsigned char                   cached_mode;
+        unsigned char                   cached_pvr;
+        unsigned char                   cached_dafo;
+};
+
+/*
+ * This assumes you have a 29.4912 MHz clock for your UART.
+ */
+#define SAB_BASE_BAUD ( 29491200 / 16 )
+
+static char *sab82532_version[16] = {
+        "V1.0", "V2.0", "V3.2", "V(0x03)",
+        "V(0x04)", "V(0x05)", "V(0x06)", "V(0x07)",
+        "V(0x08)", "V(0x09)", "V(0x0a)", "V(0x0b)",
+        "V(0x0c)", "V(0x0d)", "V(0x0e)", "V(0x0f)"
+};
+
+#define SAB82532_MAX_TEC_TIMEOUT 200000 /* 1 character time (at 50 baud) */
+#define SAB82532_MAX_CEC_TIMEOUT  50000 /* 2.5 TX CLKs (at 50 baud) */
+
+#define SAB82532_RECV_FIFO_SIZE 32      /* Standard async fifo sizes */
+#define SAB82532_XMIT_FIFO_SIZE 32
+
+static __inline__ void sunsab_tec_wait(struct uart_sunsab_port *up)
+{
+        int timeout = up->tec_timeout;
+
+        while ((readb(&up->regs->r.star) & SAB82532_STAR_TEC) && --timeout)
+                udelay(1);
+}
+
+static __inline__ void sunsab_cec_wait(struct uart_sunsab_port *up)
+{
+        int timeout = up->cec_timeout;
+
+        while ((readb(&up->regs->r.star) & SAB82532_STAR_CEC) && --timeout)
+                udelay(1);
+}
+
+static struct tty_struct *
+receive_chars(struct uart_sunsab_port *up,
+              union sab82532_irq_status *stat)
+{
+        struct tty_struct *tty = NULL;
+        unsigned char buf[32];
+        int saw_console_brk = 0;
+        int free_fifo = 0;
+        int count = 0;
+        int i;
+
+        if (up->port.state != NULL)             /* Unopened serial console */
+                tty = up->port.state->port.tty;
+
+        /* Read number of BYTES (Character + Status) available. */
+        if (stat->sreg.isr0 & SAB82532_ISR0_RPF) {
+                count = SAB82532_RECV_FIFO_SIZE;
+                free_fifo++;
+        }
+
+        if (stat->sreg.isr0 & SAB82532_ISR0_TCD) {
+                count = readb(&up->regs->r.rbcl) & (SAB82532_RECV_FIFO_SIZE - 1);
+                free_fifo++;
+        }
+
+        /* Issue a FIFO read command in case we where idle. */
+        if (stat->sreg.isr0 & SAB82532_ISR0_TIME) {
+                sunsab_cec_wait(up);
+                writeb(SAB82532_CMDR_RFRD, &up->regs->w.cmdr);
+                return tty;
+        }
+
+        if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
+                free_fifo++;
+
+        /* Read the FIFO. */
+        for (i = 0; i < count; i++)
+                buf[i] = readb(&up->regs->r.rfifo[i]);
+
+        /* Issue Receive Message Complete command. */
+        if (free_fifo) {
+                sunsab_cec_wait(up);
+                writeb(SAB82532_CMDR_RMC, &up->regs->w.cmdr);
+        }
+
+        /* Count may be zero for BRK, so we check for it here */
+        if ((stat->sreg.isr1 & SAB82532_ISR1_BRK) &&
+            (up->port.line == up->port.cons->index))
+                saw_console_brk = 1;
+
+        for (i = 0; i < count; i++) {
+                unsigned char ch = buf[i], flag;
+
+                if (tty == NULL) {
+                        uart_handle_sysrq_char(&up->port, ch);
+                        continue;
+                }
+
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                if (unlikely(stat->sreg.isr0 & (SAB82532_ISR0_PERR |
+                                                SAB82532_ISR0_FERR |
+                                                SAB82532_ISR0_RFO)) ||
+                    unlikely(stat->sreg.isr1 & SAB82532_ISR1_BRK)) {
+                        /*
+                         * For statistics only
+                         */
+                        if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
+                                stat->sreg.isr0 &= ~(SAB82532_ISR0_PERR |
+                                                     SAB82532_ISR0_FERR);
+                                up->port.icount.brk++;
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        continue;
+                        } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
+                                up->port.icount.parity++;
+                        else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
+                                up->port.icount.frame++;
+                        if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
+                                up->port.icount.overrun++;
+
+                        /*
+                         * Mask off conditions which should be ingored.
+                         */
+                        stat->sreg.isr0 &= (up->port.read_status_mask & 0xff);
+                        stat->sreg.isr1 &= ((up->port.read_status_mask >> 8) & 0xff);
+
+                        if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
+                                flag = TTY_BREAK;
+                        } else if (stat->sreg.isr0 & SAB82532_ISR0_PERR)
+                                flag = TTY_PARITY;
+                        else if (stat->sreg.isr0 & SAB82532_ISR0_FERR)
+                                flag = TTY_FRAME;
+                }
+
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        continue;
+
+                if ((stat->sreg.isr0 & (up->port.ignore_status_mask & 0xff)) == 0 &&
+                    (stat->sreg.isr1 & ((up->port.ignore_status_mask >> 8) & 0xff)) == 0)
+                        tty_insert_flip_char(tty, ch, flag);
+                if (stat->sreg.isr0 & SAB82532_ISR0_RFO)
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+        }
+
+        if (saw_console_brk)
+                sun_do_break();
+
+        return tty;
+}
+
+static void sunsab_stop_tx(struct uart_port *);
+static void sunsab_tx_idle(struct uart_sunsab_port *);
+
+static void transmit_chars(struct uart_sunsab_port *up,
+                           union sab82532_irq_status *stat)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int i;
+
+        if (stat->sreg.isr1 & SAB82532_ISR1_ALLS) {
+                up->interrupt_mask1 |= SAB82532_IMR1_ALLS;
+                writeb(up->interrupt_mask1, &up->regs->w.imr1);
+                set_bit(SAB82532_ALLS, &up->irqflags);
+        }
+
+#if 0 /* bde@nwlink.com says this check causes problems */
+        if (!(stat->sreg.isr1 & SAB82532_ISR1_XPR))
+                return;
+#endif
+
+        if (!(readb(&up->regs->r.star) & SAB82532_STAR_XFW))
+                return;
+
+        set_bit(SAB82532_XPR, &up->irqflags);
+        sunsab_tx_idle(up);
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+                up->interrupt_mask1 |= SAB82532_IMR1_XPR;
+                writeb(up->interrupt_mask1, &up->regs->w.imr1);
+                return;
+        }
+
+        up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
+        writeb(up->interrupt_mask1, &up->regs->w.imr1);
+        clear_bit(SAB82532_ALLS, &up->irqflags);
+
+        /* Stuff 32 bytes into Transmit FIFO. */
+        clear_bit(SAB82532_XPR, &up->irqflags);
+        for (i = 0; i < up->port.fifosize; i++) {
+                writeb(xmit->buf[xmit->tail],
+                       &up->regs->w.xfifo[i]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        /* Issue a Transmit Frame command. */
+        sunsab_cec_wait(up);
+        writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        if (uart_circ_empty(xmit))
+                sunsab_stop_tx(&up->port);
+}
+
+static void check_status(struct uart_sunsab_port *up,
+                         union sab82532_irq_status *stat)
+{
+        if (stat->sreg.isr0 & SAB82532_ISR0_CDSC)
+                uart_handle_dcd_change(&up->port,
+                                       !(readb(&up->regs->r.vstr) & SAB82532_VSTR_CD));
+
+        if (stat->sreg.isr1 & SAB82532_ISR1_CSC)
+                uart_handle_cts_change(&up->port,
+                                       (readb(&up->regs->r.star) & SAB82532_STAR_CTS));
+
+        if ((readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ^ up->dsr) {
+                up->dsr = (readb(&up->regs->r.pvr) & up->pvr_dsr_bit) ? 0 : 1;
+                up->port.icount.dsr++;
+        }
+
+        wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+}
+
+static irqreturn_t sunsab_interrupt(int irq, void *dev_id)
+{
+        struct uart_sunsab_port *up = dev_id;
+        struct tty_struct *tty;
+        union sab82532_irq_status status;
+        unsigned long flags;
+        unsigned char gis;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        status.stat = 0;
+        gis = readb(&up->regs->r.gis) >> up->gis_shift;
+        if (gis & 1)
+                status.sreg.isr0 = readb(&up->regs->r.isr0);
+        if (gis & 2)
+                status.sreg.isr1 = readb(&up->regs->r.isr1);
+
+        tty = NULL;
+        if (status.stat) {
+                if ((status.sreg.isr0 & (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
+                                         SAB82532_ISR0_RFO | SAB82532_ISR0_RPF)) ||
+                    (status.sreg.isr1 & SAB82532_ISR1_BRK))
+                        tty = receive_chars(up, &status);
+                if ((status.sreg.isr0 & SAB82532_ISR0_CDSC) ||
+                    (status.sreg.isr1 & SAB82532_ISR1_CSC))
+                        check_status(up, &status);
+                if (status.sreg.isr1 & (SAB82532_ISR1_ALLS | SAB82532_ISR1_XPR))
+                        transmit_chars(up, &status);
+        }
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        if (tty)
+                tty_flip_buffer_push(tty);
+
+        return IRQ_HANDLED;
+}
+
+/* port->lock is not held.  */
+static unsigned int sunsab_tx_empty(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        int ret;
+
+        /* Do not need a lock for a state test like this.  */
+        if (test_bit(SAB82532_ALLS, &up->irqflags))
+                ret = TIOCSER_TEMT;
+        else
+                ret = 0;
+
+        return ret;
+}
+
+/* port->lock held by caller.  */
+static void sunsab_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+
+        if (mctrl & TIOCM_RTS) {
+                up->cached_mode &= ~SAB82532_MODE_FRTS;
+                up->cached_mode |= SAB82532_MODE_RTS;
+        } else {
+                up->cached_mode |= (SAB82532_MODE_FRTS |
+                                    SAB82532_MODE_RTS);
+        }
+        if (mctrl & TIOCM_DTR) {
+                up->cached_pvr &= ~(up->pvr_dtr_bit);
+        } else {
+                up->cached_pvr |= up->pvr_dtr_bit;
+        }
+
+        set_bit(SAB82532_REGS_PENDING, &up->irqflags);
+        if (test_bit(SAB82532_XPR, &up->irqflags))
+                sunsab_tx_idle(up);
+}
+
+/* port->lock is held by caller and interrupts are disabled.  */
+static unsigned int sunsab_get_mctrl(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        unsigned char val;
+        unsigned int result;
+
+        result = 0;
+
+        val = readb(&up->regs->r.pvr);
+        result |= (val & up->pvr_dsr_bit) ? 0 : TIOCM_DSR;
+
+        val = readb(&up->regs->r.vstr);
+        result |= (val & SAB82532_VSTR_CD) ? 0 : TIOCM_CAR;
+
+        val = readb(&up->regs->r.star);
+        result |= (val & SAB82532_STAR_CTS) ? TIOCM_CTS : 0;
+
+        return result;
+}
+
+/* port->lock held by caller.  */
+static void sunsab_stop_tx(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+
+        up->interrupt_mask1 |= SAB82532_IMR1_XPR;
+        writeb(up->interrupt_mask1, &up->regs->w.imr1);
+}
+
+/* port->lock held by caller.  */
+static void sunsab_tx_idle(struct uart_sunsab_port *up)
+{
+        if (test_bit(SAB82532_REGS_PENDING, &up->irqflags)) {
+                u8 tmp;
+
+                clear_bit(SAB82532_REGS_PENDING, &up->irqflags);
+                writeb(up->cached_mode, &up->regs->rw.mode);
+                writeb(up->cached_pvr, &up->regs->rw.pvr);
+                writeb(up->cached_dafo, &up->regs->w.dafo);
+
+                writeb(up->cached_ebrg & 0xff, &up->regs->w.bgr);
+                tmp = readb(&up->regs->rw.ccr2);
+                tmp &= ~0xc0;
+                tmp |= (up->cached_ebrg >> 2) & 0xc0;
+                writeb(tmp, &up->regs->rw.ccr2);
+        }
+}
+
+/* port->lock held by caller.  */
+static void sunsab_start_tx(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int i;
+
+        up->interrupt_mask1 &= ~(SAB82532_IMR1_ALLS|SAB82532_IMR1_XPR);
+        writeb(up->interrupt_mask1, &up->regs->w.imr1);
+        
+        if (!test_bit(SAB82532_XPR, &up->irqflags))
+                return;
+
+        clear_bit(SAB82532_ALLS, &up->irqflags);
+        clear_bit(SAB82532_XPR, &up->irqflags);
+
+        for (i = 0; i < up->port.fifosize; i++) {
+                writeb(xmit->buf[xmit->tail],
+                       &up->regs->w.xfifo[i]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        }
+
+        /* Issue a Transmit Frame command.  */
+        sunsab_cec_wait(up);
+        writeb(SAB82532_CMDR_XF, &up->regs->w.cmdr);
+}
+
+/* port->lock is not held.  */
+static void sunsab_send_xchar(struct uart_port *port, char ch)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        sunsab_tec_wait(up);
+        writeb(ch, &up->regs->w.tic);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+/* port->lock held by caller.  */
+static void sunsab_stop_rx(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+
+        up->interrupt_mask0 |= SAB82532_IMR0_TCD;
+        writeb(up->interrupt_mask1, &up->regs->w.imr0);
+}
+
+/* port->lock held by caller.  */
+static void sunsab_enable_ms(struct uart_port *port)
+{
+        /* For now we always receive these interrupts.  */
+}
+
+/* port->lock is not held.  */
+static void sunsab_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        unsigned long flags;
+        unsigned char val;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        val = up->cached_dafo;
+        if (break_state)
+                val |= SAB82532_DAFO_XBRK;
+        else
+                val &= ~SAB82532_DAFO_XBRK;
+        up->cached_dafo = val;
+
+        set_bit(SAB82532_REGS_PENDING, &up->irqflags);
+        if (test_bit(SAB82532_XPR, &up->irqflags))
+                sunsab_tx_idle(up);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+/* port->lock is not held.  */
+static int sunsab_startup(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        unsigned long flags;
+        unsigned char tmp;
+        int err = request_irq(up->port.irq, sunsab_interrupt,
+                              IRQF_SHARED, "sab", up);
+        if (err)
+                return err;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /*
+         * Wait for any commands or immediate characters
+         */
+        sunsab_cec_wait(up);
+        sunsab_tec_wait(up);
+
+        /*
+         * Clear the FIFO buffers.
+         */
+        writeb(SAB82532_CMDR_RRES, &up->regs->w.cmdr);
+        sunsab_cec_wait(up);
+        writeb(SAB82532_CMDR_XRES, &up->regs->w.cmdr);
+
+        /*
+         * Clear the interrupt registers.
+         */
+        (void) readb(&up->regs->r.isr0);
+        (void) readb(&up->regs->r.isr1);
+
+        /*
+         * Now, initialize the UART 
+         */
+        writeb(0, &up->regs->w.ccr0);                           /* power-down */
+        writeb(SAB82532_CCR0_MCE | SAB82532_CCR0_SC_NRZ |
+               SAB82532_CCR0_SM_ASYNC, &up->regs->w.ccr0);
+        writeb(SAB82532_CCR1_ODS | SAB82532_CCR1_BCR | 7, &up->regs->w.ccr1);
+        writeb(SAB82532_CCR2_BDF | SAB82532_CCR2_SSEL |
+               SAB82532_CCR2_TOE, &up->regs->w.ccr2);
+        writeb(0, &up->regs->w.ccr3);
+        writeb(SAB82532_CCR4_MCK4 | SAB82532_CCR4_EBRG, &up->regs->w.ccr4);
+        up->cached_mode = (SAB82532_MODE_RTS | SAB82532_MODE_FCTS |
+                           SAB82532_MODE_RAC);
+        writeb(up->cached_mode, &up->regs->w.mode);
+        writeb(SAB82532_RFC_DPS|SAB82532_RFC_RFTH_32, &up->regs->w.rfc);
+        
+        tmp = readb(&up->regs->rw.ccr0);
+        tmp |= SAB82532_CCR0_PU;        /* power-up */
+        writeb(tmp, &up->regs->rw.ccr0);
+
+        /*
+         * Finally, enable interrupts
+         */
+        up->interrupt_mask0 = (SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
+                               SAB82532_IMR0_PLLA);
+        writeb(up->interrupt_mask0, &up->regs->w.imr0);
+        up->interrupt_mask1 = (SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
+                               SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
+                               SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
+                               SAB82532_IMR1_XPR);
+        writeb(up->interrupt_mask1, &up->regs->w.imr1);
+        set_bit(SAB82532_ALLS, &up->irqflags);
+        set_bit(SAB82532_XPR, &up->irqflags);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return 0;
+}
+
+/* port->lock is not held.  */
+static void sunsab_shutdown(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /* Disable Interrupts */
+        up->interrupt_mask0 = 0xff;
+        writeb(up->interrupt_mask0, &up->regs->w.imr0);
+        up->interrupt_mask1 = 0xff;
+        writeb(up->interrupt_mask1, &up->regs->w.imr1);
+
+        /* Disable break condition */
+        up->cached_dafo = readb(&up->regs->rw.dafo);
+        up->cached_dafo &= ~SAB82532_DAFO_XBRK;
+        writeb(up->cached_dafo, &up->regs->rw.dafo);
+
+        /* Disable Receiver */  
+        up->cached_mode &= ~SAB82532_MODE_RAC;
+        writeb(up->cached_mode, &up->regs->rw.mode);
+
+        /*
+         * XXX FIXME
+         *
+         * If the chip is powered down here the system hangs/crashes during
+         * reboot or shutdown.  This needs to be investigated further,
+         * similar behaviour occurs in 2.4 when the driver is configured
+         * as a module only.  One hint may be that data is sometimes
+         * transmitted at 9600 baud during shutdown (regardless of the
+         * speed the chip was configured for when the port was open).
+         */
+#if 0
+        /* Power Down */        
+        tmp = readb(&up->regs->rw.ccr0);
+        tmp &= ~SAB82532_CCR0_PU;
+        writeb(tmp, &up->regs->rw.ccr0);
+#endif
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        free_irq(up->port.irq, up);
+}
+
+/*
+ * This is used to figure out the divisor speeds.
+ *
+ * The formula is:    Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)),
+ *
+ * with               0 <= N < 64 and 0 <= M < 16
+ */
+
+static void calc_ebrg(int baud, int *n_ret, int *m_ret)
+{
+        int     n, m;
+
+        if (baud == 0) {
+                *n_ret = 0;
+                *m_ret = 0;
+                return;
+        }
+     
+        /*
+         * We scale numbers by 10 so that we get better accuracy
+         * without having to use floating point.  Here we increment m
+         * until n is within the valid range.
+         */
+        n = (SAB_BASE_BAUD * 10) / baud;
+        m = 0;
+        while (n >= 640) {
+                n = n / 2;
+                m++;
+        }
+        n = (n+5) / 10;
+        /*
+         * We try very hard to avoid speeds with M == 0 since they may
+         * not work correctly for XTAL frequences above 10 MHz.
+         */
+        if ((m == 0) && ((n & 1) == 0)) {
+                n = n / 2;
+                m++;
+        }
+        *n_ret = n - 1;
+        *m_ret = m;
+}
+
+/* Internal routine, port->lock is held and local interrupts are disabled.  */
+static void sunsab_convert_to_sab(struct uart_sunsab_port *up, unsigned int cflag,
+                                  unsigned int iflag, unsigned int baud,
+                                  unsigned int quot)
+{
+        unsigned char dafo;
+        int bits, n, m;
+
+        /* Byte size and parity */
+        switch (cflag & CSIZE) {
+              case CS5: dafo = SAB82532_DAFO_CHL5; bits = 7; break;
+              case CS6: dafo = SAB82532_DAFO_CHL6; bits = 8; break;
+              case CS7: dafo = SAB82532_DAFO_CHL7; bits = 9; break;
+              case CS8: dafo = SAB82532_DAFO_CHL8; bits = 10; break;
+              /* Never happens, but GCC is too dumb to figure it out */
+              default:  dafo = SAB82532_DAFO_CHL5; bits = 7; break;
+        }
+
+        if (cflag & CSTOPB) {
+                dafo |= SAB82532_DAFO_STOP;
+                bits++;
+        }
+
+        if (cflag & PARENB) {
+                dafo |= SAB82532_DAFO_PARE;
+                bits++;
+        }
+
+        if (cflag & PARODD) {
+                dafo |= SAB82532_DAFO_PAR_ODD;
+        } else {
+                dafo |= SAB82532_DAFO_PAR_EVEN;
+        }
+        up->cached_dafo = dafo;
+
+        calc_ebrg(baud, &n, &m);
+
+        up->cached_ebrg = n | (m << 6);
+
+        up->tec_timeout = (10 * 1000000) / baud;
+        up->cec_timeout = up->tec_timeout >> 2;
+
+        /* CTS flow control flags */
+        /* We encode read_status_mask and ignore_status_mask like so:
+         *
+         * ---------------------
+         * | ... | ISR1 | ISR0 |
+         * ---------------------
+         *  ..    15   8 7    0
+         */
+
+        up->port.read_status_mask = (SAB82532_ISR0_TCD | SAB82532_ISR0_TIME |
+                                     SAB82532_ISR0_RFO | SAB82532_ISR0_RPF |
+                                     SAB82532_ISR0_CDSC);
+        up->port.read_status_mask |= (SAB82532_ISR1_CSC |
+                                      SAB82532_ISR1_ALLS |
+                                      SAB82532_ISR1_XPR) << 8;
+        if (iflag & INPCK)
+                up->port.read_status_mask |= (SAB82532_ISR0_PERR |
+                                              SAB82532_ISR0_FERR);
+        if (iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= (SAB82532_ISR1_BRK << 8);
+
+        /*
+         * Characteres to ignore
+         */
+        up->port.ignore_status_mask = 0;
+        if (iflag & IGNPAR)
+                up->port.ignore_status_mask |= (SAB82532_ISR0_PERR |
+                                                SAB82532_ISR0_FERR);
+        if (iflag & IGNBRK) {
+                up->port.ignore_status_mask |= (SAB82532_ISR1_BRK << 8);
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (iflag & IGNPAR)
+                        up->port.ignore_status_mask |= SAB82532_ISR0_RFO;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= (SAB82532_ISR0_RPF |
+                                                SAB82532_ISR0_TCD);
+
+        uart_update_timeout(&up->port, cflag,
+                            (up->port.uartclk / (16 * quot)));
+
+        /* Now schedule a register update when the chip's
+         * transmitter is idle.
+         */
+        up->cached_mode |= SAB82532_MODE_RAC;
+        set_bit(SAB82532_REGS_PENDING, &up->irqflags);
+        if (test_bit(SAB82532_XPR, &up->irqflags))
+                sunsab_tx_idle(up);
+}
+
+/* port->lock is not held.  */
+static void sunsab_set_termios(struct uart_port *port, struct ktermios *termios,
+                               struct ktermios *old)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
+        unsigned long flags;
+        unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
+        unsigned int quot = uart_get_divisor(port, baud);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        sunsab_convert_to_sab(up, termios->c_cflag, termios->c_iflag, baud, quot);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static const char *sunsab_type(struct uart_port *port)
+{
+        struct uart_sunsab_port *up = (void *)port;
+        static char buf[36];
+        
+        sprintf(buf, "SAB82532 %s", sab82532_version[up->type]);
+        return buf;
+}
+
+static void sunsab_release_port(struct uart_port *port)
+{
+}
+
+static int sunsab_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void sunsab_config_port(struct uart_port *port, int flags)
+{
+}
+
+static int sunsab_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+static struct uart_ops sunsab_pops = {
+        .tx_empty       = sunsab_tx_empty,
+        .set_mctrl      = sunsab_set_mctrl,
+        .get_mctrl      = sunsab_get_mctrl,
+        .stop_tx        = sunsab_stop_tx,
+        .start_tx       = sunsab_start_tx,
+        .send_xchar     = sunsab_send_xchar,
+        .stop_rx        = sunsab_stop_rx,
+        .enable_ms      = sunsab_enable_ms,
+        .break_ctl      = sunsab_break_ctl,
+        .startup        = sunsab_startup,
+        .shutdown       = sunsab_shutdown,
+        .set_termios    = sunsab_set_termios,
+        .type           = sunsab_type,
+        .release_port   = sunsab_release_port,
+        .request_port   = sunsab_request_port,
+        .config_port    = sunsab_config_port,
+        .verify_port    = sunsab_verify_port,
+};
+
+static struct uart_driver sunsab_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "sunsab",
+        .dev_name               = "ttyS",
+        .major                  = TTY_MAJOR,
+};
+
+static struct uart_sunsab_port *sunsab_ports;
+
+#ifdef CONFIG_SERIAL_SUNSAB_CONSOLE
+
+static void sunsab_console_putchar(struct uart_port *port, int c)
+{
+        struct uart_sunsab_port *up = (struct uart_sunsab_port *)port;
+
+        sunsab_tec_wait(up);
+        writeb(c, &up->regs->w.tic);
+}
+
+static void sunsab_console_write(struct console *con, const char *s, unsigned n)
+{
+        struct uart_sunsab_port *up = &sunsab_ports[con->index];
+        unsigned long flags;
+        int locked = 1;
+
+        local_irq_save(flags);
+        if (up->port.sysrq) {
+                locked = 0;
+        } else if (oops_in_progress) {
+                locked = spin_trylock(&up->port.lock);
+        } else
+                spin_lock(&up->port.lock);
+
+        uart_console_write(&up->port, s, n, sunsab_console_putchar);
+        sunsab_tec_wait(up);
+
+        if (locked)
+                spin_unlock(&up->port.lock);
+        local_irq_restore(flags);
+}
+
+static int sunsab_console_setup(struct console *con, char *options)
+{
+        struct uart_sunsab_port *up = &sunsab_ports[con->index];
+        unsigned long flags;
+        unsigned int baud, quot;
+
+        /*
+         * The console framework calls us for each and every port
+         * registered. Defer the console setup until the requested
+         * port has been properly discovered. A bit of a hack,
+         * though...
+         */
+        if (up->port.type != PORT_SUNSAB)
+                return -1;
+
+        printk("Console: ttyS%d (SAB82532)\n",
+               (sunsab_reg.minor - 64) + con->index);
+
+        sunserial_console_termios(con, up->port.dev->of_node);
+
+        switch (con->cflag & CBAUD) {
+        case B150: baud = 150; break;
+        case B300: baud = 300; break;
+        case B600: baud = 600; break;
+        case B1200: baud = 1200; break;
+        case B2400: baud = 2400; break;
+        case B4800: baud = 4800; break;
+        default: case B9600: baud = 9600; break;
+        case B19200: baud = 19200; break;
+        case B38400: baud = 38400; break;
+        case B57600: baud = 57600; break;
+        case B115200: baud = 115200; break;
+        case B230400: baud = 230400; break;
+        case B460800: baud = 460800; break;
+        };
+
+        /*
+         * Temporary fix.
+         */
+        spin_lock_init(&up->port.lock);
+
+        /*
+         * Initialize the hardware
+         */
+        sunsab_startup(&up->port);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /*
+         * Finally, enable interrupts
+         */
+        up->interrupt_mask0 = SAB82532_IMR0_PERR | SAB82532_IMR0_FERR |
+                                SAB82532_IMR0_PLLA | SAB82532_IMR0_CDSC;
+        writeb(up->interrupt_mask0, &up->regs->w.imr0);
+        up->interrupt_mask1 = SAB82532_IMR1_BRKT | SAB82532_IMR1_ALLS |
+                                SAB82532_IMR1_XOFF | SAB82532_IMR1_TIN |
+                                SAB82532_IMR1_CSC | SAB82532_IMR1_XON |
+                                SAB82532_IMR1_XPR;
+        writeb(up->interrupt_mask1, &up->regs->w.imr1);
+
+        quot = uart_get_divisor(&up->port, baud);
+        sunsab_convert_to_sab(up, con->cflag, 0, baud, quot);
+        sunsab_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+        
+        return 0;
+}
+
+static struct console sunsab_console = {
+        .name   =       "ttyS",
+        .write  =       sunsab_console_write,
+        .device =       uart_console_device,
+        .setup  =       sunsab_console_setup,
+        .flags  =       CON_PRINTBUFFER,
+        .index  =       -1,
+        .data   =       &sunsab_reg,
+};
+
+static inline struct console *SUNSAB_CONSOLE(void)
+{
+        return &sunsab_console;
+}
+#else
+#define SUNSAB_CONSOLE()        (NULL)
+#define sunsab_console_init()   do { } while (0)
+#endif
+
+static int __devinit sunsab_init_one(struct uart_sunsab_port *up,
+                                     struct platform_device *op,
+                                     unsigned long offset,
+                                     int line)
+{
+        up->port.line = line;
+        up->port.dev = &op->dev;
+
+        up->port.mapbase = op->resource[0].start + offset;
+        up->port.membase = of_ioremap(&op->resource[0], offset,
+                                      sizeof(union sab82532_async_regs),
+                                      "sab");
+        if (!up->port.membase)
+                return -ENOMEM;
+        up->regs = (union sab82532_async_regs __iomem *) up->port.membase;
+
+        up->port.irq = op->archdata.irqs[0];
+
+        up->port.fifosize = SAB82532_XMIT_FIFO_SIZE;
+        up->port.iotype = UPIO_MEM;
+
+        writeb(SAB82532_IPC_IC_ACT_LOW, &up->regs->w.ipc);
+
+        up->port.ops = &sunsab_pops;
+        up->port.type = PORT_SUNSAB;
+        up->port.uartclk = SAB_BASE_BAUD;
+
+        up->type = readb(&up->regs->r.vstr) & 0x0f;
+        writeb(~((1 << 1) | (1 << 2) | (1 << 4)), &up->regs->w.pcr);
+        writeb(0xff, &up->regs->w.pim);
+        if ((up->port.line & 0x1) == 0) {
+                up->pvr_dsr_bit = (1 << 0);
+                up->pvr_dtr_bit = (1 << 1);
+                up->gis_shift = 2;
+        } else {
+                up->pvr_dsr_bit = (1 << 3);
+                up->pvr_dtr_bit = (1 << 2);
+                up->gis_shift = 0;
+        }
+        up->cached_pvr = (1 << 1) | (1 << 2) | (1 << 4);
+        writeb(up->cached_pvr, &up->regs->w.pvr);
+        up->cached_mode = readb(&up->regs->rw.mode);
+        up->cached_mode |= SAB82532_MODE_FRTS;
+        writeb(up->cached_mode, &up->regs->rw.mode);
+        up->cached_mode |= SAB82532_MODE_RTS;
+        writeb(up->cached_mode, &up->regs->rw.mode);
+
+        up->tec_timeout = SAB82532_MAX_TEC_TIMEOUT;
+        up->cec_timeout = SAB82532_MAX_CEC_TIMEOUT;
+
+        return 0;
+}
+
+static int __devinit sab_probe(struct platform_device *op)
+{
+        static int inst;
+        struct uart_sunsab_port *up;
+        int err;
+
+        up = &sunsab_ports[inst * 2];
+
+        err = sunsab_init_one(&up[0], op,
+                              0,
+                              (inst * 2) + 0);
+        if (err)
+                goto out;
+
+        err = sunsab_init_one(&up[1], op,
+                              sizeof(union sab82532_async_regs),
+                              (inst * 2) + 1);
+        if (err)
+                goto out1;
+
+        sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
+                                &sunsab_reg, up[0].port.line,
+                                false);
+
+        sunserial_console_match(SUNSAB_CONSOLE(), op->dev.of_node,
+                                &sunsab_reg, up[1].port.line,
+                                false);
+
+        err = uart_add_one_port(&sunsab_reg, &up[0].port);
+        if (err)
+                goto out2;
+
+        err = uart_add_one_port(&sunsab_reg, &up[1].port);
+        if (err)
+                goto out3;
+
+        dev_set_drvdata(&op->dev, &up[0]);
+
+        inst++;
+
+        return 0;
+
+out3:
+        uart_remove_one_port(&sunsab_reg, &up[0].port);
+out2:
+        of_iounmap(&op->resource[0],
+                   up[1].port.membase,
+                   sizeof(union sab82532_async_regs));
+out1:
+        of_iounmap(&op->resource[0],
+                   up[0].port.membase,
+                   sizeof(union sab82532_async_regs));
+out:
+        return err;
+}
+
+static int __devexit sab_remove(struct platform_device *op)
+{
+        struct uart_sunsab_port *up = dev_get_drvdata(&op->dev);
+
+        uart_remove_one_port(&sunsab_reg, &up[1].port);
+        uart_remove_one_port(&sunsab_reg, &up[0].port);
+        of_iounmap(&op->resource[0],
+                   up[1].port.membase,
+                   sizeof(union sab82532_async_regs));
+        of_iounmap(&op->resource[0],
+                   up[0].port.membase,
+                   sizeof(union sab82532_async_regs));
+
+        dev_set_drvdata(&op->dev, NULL);
+
+        return 0;
+}
+
+static const struct of_device_id sab_match[] = {
+        {
+                .name = "se",
+        },
+        {
+                .name = "serial",
+                .compatible = "sab82532",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, sab_match);
+
+static struct platform_driver sab_driver = {
+        .driver = {
+                .name = "sab",
+                .owner = THIS_MODULE,
+                .of_match_table = sab_match,
+        },
+        .probe          = sab_probe,
+        .remove         = __devexit_p(sab_remove),
+};
+
+static int __init sunsab_init(void)
+{
+        struct device_node *dp;
+        int err;
+        int num_channels = 0;
+
+        for_each_node_by_name(dp, "se")
+                num_channels += 2;
+        for_each_node_by_name(dp, "serial") {
+                if (of_device_is_compatible(dp, "sab82532"))
+                        num_channels += 2;
+        }
+
+        if (num_channels) {
+                sunsab_ports = kzalloc(sizeof(struct uart_sunsab_port) *
+                                       num_channels, GFP_KERNEL);
+                if (!sunsab_ports)
+                        return -ENOMEM;
+
+                err = sunserial_register_minors(&sunsab_reg, num_channels);
+                if (err) {
+                        kfree(sunsab_ports);
+                        sunsab_ports = NULL;
+
+                        return err;
+                }
+        }
+
+        return platform_driver_register(&sab_driver);
+}
+
+static void __exit sunsab_exit(void)
+{
+        platform_driver_unregister(&sab_driver);
+        if (sunsab_reg.nr) {
+                sunserial_unregister_minors(&sunsab_reg, sunsab_reg.nr);
+        }
+
+        kfree(sunsab_ports);
+        sunsab_ports = NULL;
+}
+
+module_init(sunsab_init);
+module_exit(sunsab_exit);
+
+MODULE_AUTHOR("Eddie C. Dost and David S. Miller");
+MODULE_DESCRIPTION("Sun SAB82532 serial port driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/sunsab.h b/drivers/tty/serial/sunsab.h
new file mode 100644
index 000000000000..b78e1f7b8050
--- /dev/null
+++ b/drivers/tty/serial/sunsab.h
@@ -0,0 +1,322 @@
+/* sunsab.h: Register Definitions for the Siemens SAB82532 DUSCC
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ */
+
+#ifndef _SUNSAB_H
+#define _SUNSAB_H
+
+struct sab82532_async_rd_regs {
+        u8      rfifo[0x20];    /* Receive FIFO                         */
+        u8      star;           /* Status Register                      */
+        u8      __pad1;
+        u8      mode;           /* Mode Register                        */
+        u8      timr;           /* Timer Register                       */
+        u8      xon;            /* XON Character                        */
+        u8      xoff;           /* XOFF Character                       */
+        u8      tcr;            /* Termination Character Register       */
+        u8      dafo;           /* Data Format                          */
+        u8      rfc;            /* RFIFO Control Register               */
+        u8      __pad2;
+        u8      rbcl;           /* Receive Byte Count Low               */
+        u8      rbch;           /* Receive Byte Count High              */
+        u8      ccr0;           /* Channel Configuration Register 0     */
+        u8      ccr1;           /* Channel Configuration Register 1     */
+        u8      ccr2;           /* Channel Configuration Register 2     */
+        u8      ccr3;           /* Channel Configuration Register 3     */
+        u8      __pad3[4];
+        u8      vstr;           /* Version Status Register              */
+        u8      __pad4[3];
+        u8      gis;            /* Global Interrupt Status              */
+        u8      ipc;            /* Interrupt Port Configuration         */
+        u8      isr0;           /* Interrupt Status 0                   */
+        u8      isr1;           /* Interrupt Status 1                   */
+        u8      pvr;            /* Port Value Register                  */
+        u8      pis;            /* Port Interrupt Status                */
+        u8      pcr;            /* Port Configuration Register          */
+        u8      ccr4;           /* Channel Configuration Register 4     */
+};
+
+struct sab82532_async_wr_regs {
+        u8      xfifo[0x20];    /* Transmit FIFO                        */
+        u8      cmdr;           /* Command Register                     */
+        u8      __pad1;
+        u8      mode;
+        u8      timr;
+        u8      xon;
+        u8      xoff;
+        u8      tcr;
+        u8      dafo;
+        u8      rfc;
+        u8      __pad2;
+        u8      xbcl;           /* Transmit Byte Count Low              */
+        u8      xbch;           /* Transmit Byte Count High             */
+        u8      ccr0;
+        u8      ccr1;
+        u8      ccr2;
+        u8      ccr3;
+        u8      tsax;           /* Time-Slot Assignment Reg. Transmit   */
+        u8      tsar;           /* Time-Slot Assignment Reg. Receive    */
+        u8      xccr;           /* Transmit Channel Capacity Register   */
+        u8      rccr;           /* Receive Channel Capacity Register    */
+        u8      bgr;            /* Baud Rate Generator Register         */
+        u8      tic;            /* Transmit Immediate Character         */
+        u8      mxn;            /* Mask XON Character                   */
+        u8      mxf;            /* Mask XOFF Character                  */
+        u8      iva;            /* Interrupt Vector Address             */
+        u8      ipc;
+        u8      imr0;           /* Interrupt Mask Register 0            */
+        u8      imr1;           /* Interrupt Mask Register 1            */
+        u8      pvr;
+        u8      pim;            /* Port Interrupt Mask                  */
+        u8      pcr;
+        u8      ccr4;
+};
+
+struct sab82532_async_rw_regs { /* Read/Write registers                 */
+        u8      __pad1[0x20];
+        u8      __pad2;
+        u8      __pad3;
+        u8      mode;
+        u8      timr;
+        u8      xon;
+        u8      xoff;
+        u8      tcr;
+        u8      dafo;
+        u8      rfc;
+        u8      __pad4;
+        u8      __pad5;
+        u8      __pad6;
+        u8      ccr0;
+        u8      ccr1;
+        u8      ccr2;
+        u8      ccr3;
+        u8      __pad7;
+        u8      __pad8;
+        u8      __pad9;
+        u8      __pad10;
+        u8      __pad11;
+        u8      __pad12;
+        u8      __pad13;
+        u8      __pad14;
+        u8      __pad15;
+        u8      ipc;
+        u8      __pad16;
+        u8      __pad17;
+        u8      pvr;
+        u8      __pad18;
+        u8      pcr;
+        u8      ccr4;
+};
+
+union sab82532_async_regs {
+        __volatile__ struct sab82532_async_rd_regs      r;
+        __volatile__ struct sab82532_async_wr_regs      w;
+        __volatile__ struct sab82532_async_rw_regs      rw;
+};
+
+union sab82532_irq_status {
+        unsigned short                   stat;
+        struct {
+                unsigned char            isr0;
+                unsigned char            isr1;
+        } sreg;
+};
+
+/* irqflags bits */
+#define SAB82532_ALLS                   0x00000001
+#define SAB82532_XPR                    0x00000002
+#define SAB82532_REGS_PENDING           0x00000004
+
+/* RFIFO Status Byte */
+#define SAB82532_RSTAT_PE               0x80
+#define SAB82532_RSTAT_FE               0x40
+#define SAB82532_RSTAT_PARITY           0x01
+
+/* Status Register (STAR) */
+#define SAB82532_STAR_XDOV              0x80
+#define SAB82532_STAR_XFW               0x40
+#define SAB82532_STAR_RFNE              0x20
+#define SAB82532_STAR_FCS               0x10
+#define SAB82532_STAR_TEC               0x08
+#define SAB82532_STAR_CEC               0x04
+#define SAB82532_STAR_CTS               0x02
+
+/* Command Register (CMDR) */
+#define SAB82532_CMDR_RMC               0x80
+#define SAB82532_CMDR_RRES              0x40
+#define SAB82532_CMDR_RFRD              0x20
+#define SAB82532_CMDR_STI               0x10
+#define SAB82532_CMDR_XF                0x08
+#define SAB82532_CMDR_XRES              0x01
+
+/* Mode Register (MODE) */
+#define SAB82532_MODE_FRTS              0x40
+#define SAB82532_MODE_FCTS              0x20
+#define SAB82532_MODE_FLON              0x10
+#define SAB82532_MODE_RAC               0x08
+#define SAB82532_MODE_RTS               0x04
+#define SAB82532_MODE_TRS               0x02
+#define SAB82532_MODE_TLP               0x01
+
+/* Timer Register (TIMR) */
+#define SAB82532_TIMR_CNT_MASK          0xe0
+#define SAB82532_TIMR_VALUE_MASK        0x1f
+
+/* Data Format (DAFO) */
+#define SAB82532_DAFO_XBRK              0x40
+#define SAB82532_DAFO_STOP              0x20
+#define SAB82532_DAFO_PAR_SPACE         0x00
+#define SAB82532_DAFO_PAR_ODD           0x08
+#define SAB82532_DAFO_PAR_EVEN          0x10
+#define SAB82532_DAFO_PAR_MARK          0x18
+#define SAB82532_DAFO_PARE              0x04
+#define SAB82532_DAFO_CHL8              0x00
+#define SAB82532_DAFO_CHL7              0x01
+#define SAB82532_DAFO_CHL6              0x02
+#define SAB82532_DAFO_CHL5              0x03
+
+/* RFIFO Control Register (RFC) */
+#define SAB82532_RFC_DPS                0x40
+#define SAB82532_RFC_DXS                0x20
+#define SAB82532_RFC_RFDF               0x10
+#define SAB82532_RFC_RFTH_1             0x00
+#define SAB82532_RFC_RFTH_4             0x04
+#define SAB82532_RFC_RFTH_16            0x08
+#define SAB82532_RFC_RFTH_32            0x0c
+#define SAB82532_RFC_TCDE               0x01
+
+/* Received Byte Count High (RBCH) */
+#define SAB82532_RBCH_DMA               0x80
+#define SAB82532_RBCH_CAS               0x20
+
+/* Transmit Byte Count High (XBCH) */
+#define SAB82532_XBCH_DMA               0x80
+#define SAB82532_XBCH_CAS               0x20
+#define SAB82532_XBCH_XC                0x10
+
+/* Channel Configuration Register 0 (CCR0) */
+#define SAB82532_CCR0_PU                0x80
+#define SAB82532_CCR0_MCE               0x40
+#define SAB82532_CCR0_SC_NRZ            0x00
+#define SAB82532_CCR0_SC_NRZI           0x08
+#define SAB82532_CCR0_SC_FM0            0x10
+#define SAB82532_CCR0_SC_FM1            0x14
+#define SAB82532_CCR0_SC_MANCH          0x18
+#define SAB82532_CCR0_SM_HDLC           0x00
+#define SAB82532_CCR0_SM_SDLC_LOOP      0x01
+#define SAB82532_CCR0_SM_BISYNC         0x02
+#define SAB82532_CCR0_SM_ASYNC          0x03
+
+/* Channel Configuration Register 1 (CCR1) */
+#define SAB82532_CCR1_ODS               0x10
+#define SAB82532_CCR1_BCR               0x08
+#define SAB82532_CCR1_CM_MASK           0x07
+
+/* Channel Configuration Register 2 (CCR2) */
+#define SAB82532_CCR2_SOC1              0x80
+#define SAB82532_CCR2_SOC0              0x40
+#define SAB82532_CCR2_BR9               0x80
+#define SAB82532_CCR2_BR8               0x40
+#define SAB82532_CCR2_BDF               0x20
+#define SAB82532_CCR2_SSEL              0x10
+#define SAB82532_CCR2_XCS0              0x20
+#define SAB82532_CCR2_RCS0              0x10
+#define SAB82532_CCR2_TOE               0x08
+#define SAB82532_CCR2_RWX               0x04
+#define SAB82532_CCR2_DIV               0x01
+
+/* Channel Configuration Register 3 (CCR3) */
+#define SAB82532_CCR3_PSD               0x01
+
+/* Time Slot Assignment Register Transmit (TSAX) */
+#define SAB82532_TSAX_TSNX_MASK         0xfc
+#define SAB82532_TSAX_XCS2              0x02    /* see also CCR2 */
+#define SAB82532_TSAX_XCS1              0x01
+
+/* Time Slot Assignment Register Receive (TSAR) */
+#define SAB82532_TSAR_TSNR_MASK         0xfc
+#define SAB82532_TSAR_RCS2              0x02    /* see also CCR2 */
+#define SAB82532_TSAR_RCS1              0x01
+
+/* Version Status Register (VSTR) */
+#define SAB82532_VSTR_CD                0x80
+#define SAB82532_VSTR_DPLA              0x40
+#define SAB82532_VSTR_VN_MASK           0x0f
+#define SAB82532_VSTR_VN_1              0x00
+#define SAB82532_VSTR_VN_2              0x01
+#define SAB82532_VSTR_VN_3_2            0x02
+
+/* Global Interrupt Status Register (GIS) */
+#define SAB82532_GIS_PI                 0x80
+#define SAB82532_GIS_ISA1               0x08
+#define SAB82532_GIS_ISA0               0x04
+#define SAB82532_GIS_ISB1               0x02
+#define SAB82532_GIS_ISB0               0x01
+
+/* Interrupt Vector Address (IVA) */
+#define SAB82532_IVA_MASK               0xf1
+
+/* Interrupt Port Configuration (IPC) */
+#define SAB82532_IPC_VIS                0x80
+#define SAB82532_IPC_SLA1               0x10
+#define SAB82532_IPC_SLA0               0x08
+#define SAB82532_IPC_CASM               0x04
+#define SAB82532_IPC_IC_OPEN_DRAIN      0x00
+#define SAB82532_IPC_IC_ACT_LOW         0x01
+#define SAB82532_IPC_IC_ACT_HIGH        0x03
+
+/* Interrupt Status Register 0 (ISR0) */
+#define SAB82532_ISR0_TCD               0x80
+#define SAB82532_ISR0_TIME              0x40
+#define SAB82532_ISR0_PERR              0x20
+#define SAB82532_ISR0_FERR              0x10
+#define SAB82532_ISR0_PLLA              0x08
+#define SAB82532_ISR0_CDSC              0x04
+#define SAB82532_ISR0_RFO               0x02
+#define SAB82532_ISR0_RPF               0x01
+
+/* Interrupt Status Register 1 (ISR1) */
+#define SAB82532_ISR1_BRK               0x80
+#define SAB82532_ISR1_BRKT              0x40
+#define SAB82532_ISR1_ALLS              0x20
+#define SAB82532_ISR1_XOFF              0x10
+#define SAB82532_ISR1_TIN               0x08
+#define SAB82532_ISR1_CSC               0x04
+#define SAB82532_ISR1_XON               0x02
+#define SAB82532_ISR1_XPR               0x01
+
+/* Interrupt Mask Register 0 (IMR0) */
+#define SAB82532_IMR0_TCD               0x80
+#define SAB82532_IMR0_TIME              0x40
+#define SAB82532_IMR0_PERR              0x20
+#define SAB82532_IMR0_FERR              0x10
+#define SAB82532_IMR0_PLLA              0x08
+#define SAB82532_IMR0_CDSC              0x04
+#define SAB82532_IMR0_RFO               0x02
+#define SAB82532_IMR0_RPF               0x01
+
+/* Interrupt Mask Register 1 (IMR1) */
+#define SAB82532_IMR1_BRK               0x80
+#define SAB82532_IMR1_BRKT              0x40
+#define SAB82532_IMR1_ALLS              0x20
+#define SAB82532_IMR1_XOFF              0x10
+#define SAB82532_IMR1_TIN               0x08
+#define SAB82532_IMR1_CSC               0x04
+#define SAB82532_IMR1_XON               0x02
+#define SAB82532_IMR1_XPR               0x01
+
+/* Port Interrupt Status Register (PIS) */
+#define SAB82532_PIS_SYNC_B             0x08
+#define SAB82532_PIS_DTR_B              0x04
+#define SAB82532_PIS_DTR_A              0x02
+#define SAB82532_PIS_SYNC_A             0x01
+
+/* Channel Configuration Register 4 (CCR4) */
+#define SAB82532_CCR4_MCK4              0x80
+#define SAB82532_CCR4_EBRG              0x40
+#define SAB82532_CCR4_TST1              0x20
+#define SAB82532_CCR4_ICD               0x10
+
+
+#endif /* !(_SUNSAB_H) */
diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
new file mode 100644
index 000000000000..92aa54550e84
--- /dev/null
+++ b/drivers/tty/serial/sunsu.c
@@ -0,0 +1,1608 @@
+/*
+ * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
+ *
+ * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
+ * Copyright (C) 1998-1999  Pete Zaitcev   (zaitcev@yahoo.com)
+ *
+ * This is mainly a variation of 8250.c, credits go to authors mentioned
+ * therein.  In fact this driver should be merged into the generic 8250.c
+ * infrastructure perhaps using a 8250_sparc.c module.
+ *
+ * Fixed to use tty_get_baud_rate().
+ *   Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
+ *
+ * Converted to new 2.5.x UART layer.
+ *   David S. Miller (davem@davemloft.net), 2002-Jul-29
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/slab.h>
+#ifdef CONFIG_SERIO
+#include <linux/serio.h>
+#endif
+#include <linux/serial_reg.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/of_device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+
+#if defined(CONFIG_SERIAL_SUNSU_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#include "suncore.h"
+
+/* We are on a NS PC87303 clocked with 24.0 MHz, which results
+ * in a UART clock of 1.8462 MHz.
+ */
+#define SU_BASE_BAUD    (1846200 / 16)
+
+enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
+static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };
+
+/*
+ * Here we define the default xmit fifo size used for each type of UART.
+ */
+static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
+        { "unknown",    1,      0 },
+        { "8250",       1,      0 },
+        { "16450",      1,      0 },
+        { "16550",      1,      0 },
+        { "16550A",     16,     UART_CLEAR_FIFO | UART_USE_FIFO },
+        { "Cirrus",     1,      0 },
+        { "ST16650",    1,      UART_CLEAR_FIFO | UART_STARTECH },
+        { "ST16650V2",  32,     UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
+        { "TI16750",    64,     UART_CLEAR_FIFO | UART_USE_FIFO },
+        { "Startech",   1,      0 },
+        { "16C950/954", 128,    UART_CLEAR_FIFO | UART_USE_FIFO },
+        { "ST16654",    64,     UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
+        { "XR16850",    128,    UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
+        { "RSA",        2048,   UART_CLEAR_FIFO | UART_USE_FIFO }
+};
+
+struct uart_sunsu_port {
+        struct uart_port        port;
+        unsigned char           acr;
+        unsigned char           ier;
+        unsigned short          rev;
+        unsigned char           lcr;
+        unsigned int            lsr_break_flag;
+        unsigned int            cflag;
+
+        /* Probing information.  */
+        enum su_type            su_type;
+        unsigned int            type_probed;    /* XXX Stupid */
+        unsigned long           reg_size;
+
+#ifdef CONFIG_SERIO
+        struct serio            serio;
+        int                     serio_open;
+#endif
+};
+
+static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
+{
+        offset <<= up->port.regshift;
+
+        switch (up->port.iotype) {
+        case UPIO_HUB6:
+                outb(up->port.hub6 - 1 + offset, up->port.iobase);
+                return inb(up->port.iobase + 1);
+
+        case UPIO_MEM:
+                return readb(up->port.membase + offset);
+
+        default:
+                return inb(up->port.iobase + offset);
+        }
+}
+
+static void serial_out(struct uart_sunsu_port *up, int offset, int value)
+{
+#ifndef CONFIG_SPARC64
+        /*
+         * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
+         * connected with a gate then go to SlavIO. When IRQ4 goes tristated
+         * gate outputs a logical one. Since we use level triggered interrupts
+         * we have lockup and watchdog reset. We cannot mask IRQ because
+         * keyboard shares IRQ with us (Word has it as Bob Smelik's design).
+         * This problem is similar to what Alpha people suffer, see serial.c.
+         */
+        if (offset == UART_MCR)
+                value |= UART_MCR_OUT2;
+#endif
+        offset <<= up->port.regshift;
+
+        switch (up->port.iotype) {
+        case UPIO_HUB6:
+                outb(up->port.hub6 - 1 + offset, up->port.iobase);
+                outb(value, up->port.iobase + 1);
+                break;
+
+        case UPIO_MEM:
+                writeb(value, up->port.membase + offset);
+                break;
+
+        default:
+                outb(value, up->port.iobase + offset);
+        }
+}
+
+/*
+ * We used to support using pause I/O for certain machines.  We
+ * haven't supported this for a while, but just in case it's badly
+ * needed for certain old 386 machines, I've left these #define's
+ * in....
+ */
+#define serial_inp(up, offset)          serial_in(up, offset)
+#define serial_outp(up, offset, value)  serial_out(up, offset, value)
+
+
+/*
+ * For the 16C950
+ */
+static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
+{
+        serial_out(up, UART_SCR, offset);
+        serial_out(up, UART_ICR, value);
+}
+
+#if 0 /* Unused currently */
+static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
+{
+        unsigned int value;
+
+        serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
+        serial_out(up, UART_SCR, offset);
+        value = serial_in(up, UART_ICR);
+        serial_icr_write(up, UART_ACR, up->acr);
+
+        return value;
+}
+#endif
+
+#ifdef CONFIG_SERIAL_8250_RSA
+/*
+ * Attempts to turn on the RSA FIFO.  Returns zero on failure.
+ * We set the port uart clock rate if we succeed.
+ */
+static int __enable_rsa(struct uart_sunsu_port *up)
+{
+        unsigned char mode;
+        int result;
+
+        mode = serial_inp(up, UART_RSA_MSR);
+        result = mode & UART_RSA_MSR_FIFO;
+
+        if (!result) {
+                serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
+                mode = serial_inp(up, UART_RSA_MSR);
+                result = mode & UART_RSA_MSR_FIFO;
+        }
+
+        if (result)
+                up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
+
+        return result;
+}
+
+static void enable_rsa(struct uart_sunsu_port *up)
+{
+        if (up->port.type == PORT_RSA) {
+                if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
+                        spin_lock_irq(&up->port.lock);
+                        __enable_rsa(up);
+                        spin_unlock_irq(&up->port.lock);
+                }
+                if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
+                        serial_outp(up, UART_RSA_FRR, 0);
+        }
+}
+
+/*
+ * Attempts to turn off the RSA FIFO.  Returns zero on failure.
+ * It is unknown why interrupts were disabled in here.  However,
+ * the caller is expected to preserve this behaviour by grabbing
+ * the spinlock before calling this function.
+ */
+static void disable_rsa(struct uart_sunsu_port *up)
+{
+        unsigned char mode;
+        int result;
+
+        if (up->port.type == PORT_RSA &&
+            up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
+                spin_lock_irq(&up->port.lock);
+
+                mode = serial_inp(up, UART_RSA_MSR);
+                result = !(mode & UART_RSA_MSR_FIFO);
+
+                if (!result) {
+                        serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
+                        mode = serial_inp(up, UART_RSA_MSR);
+                        result = !(mode & UART_RSA_MSR_FIFO);
+                }
+
+                if (result)
+                        up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
+                spin_unlock_irq(&up->port.lock);
+        }
+}
+#endif /* CONFIG_SERIAL_8250_RSA */
+
+static inline void __stop_tx(struct uart_sunsu_port *p)
+{
+        if (p->ier & UART_IER_THRI) {
+                p->ier &= ~UART_IER_THRI;
+                serial_out(p, UART_IER, p->ier);
+        }
+}
+
+static void sunsu_stop_tx(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+
+        __stop_tx(up);
+
+        /*
+         * We really want to stop the transmitter from sending.
+         */
+        if (up->port.type == PORT_16C950) {
+                up->acr |= UART_ACR_TXDIS;
+                serial_icr_write(up, UART_ACR, up->acr);
+        }
+}
+
+static void sunsu_start_tx(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+
+        if (!(up->ier & UART_IER_THRI)) {
+                up->ier |= UART_IER_THRI;
+                serial_out(up, UART_IER, up->ier);
+        }
+
+        /*
+         * Re-enable the transmitter if we disabled it.
+         */
+        if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
+                up->acr &= ~UART_ACR_TXDIS;
+                serial_icr_write(up, UART_ACR, up->acr);
+        }
+}
+
+static void sunsu_stop_rx(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+
+        up->ier &= ~UART_IER_RLSI;
+        up->port.read_status_mask &= ~UART_LSR_DR;
+        serial_out(up, UART_IER, up->ier);
+}
+
+static void sunsu_enable_ms(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        up->ier |= UART_IER_MSI;
+        serial_out(up, UART_IER, up->ier);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static struct tty_struct *
+receive_chars(struct uart_sunsu_port *up, unsigned char *status)
+{
+        struct tty_struct *tty = up->port.state->port.tty;
+        unsigned char ch, flag;
+        int max_count = 256;
+        int saw_console_brk = 0;
+
+        do {
+                ch = serial_inp(up, UART_RX);
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+
+                if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+                                       UART_LSR_FE | UART_LSR_OE))) {
+                        /*
+                         * For statistics only
+                         */
+                        if (*status & UART_LSR_BI) {
+                                *status &= ~(UART_LSR_FE | UART_LSR_PE);
+                                up->port.icount.brk++;
+                                if (up->port.cons != NULL &&
+                                    up->port.line == up->port.cons->index)
+                                        saw_console_brk = 1;
+                                /*
+                                 * We do the SysRQ and SAK checking
+                                 * here because otherwise the break
+                                 * may get masked by ignore_status_mask
+                                 * or read_status_mask.
+                                 */
+                                if (uart_handle_break(&up->port))
+                                        goto ignore_char;
+                        } else if (*status & UART_LSR_PE)
+                                up->port.icount.parity++;
+                        else if (*status & UART_LSR_FE)
+                                up->port.icount.frame++;
+                        if (*status & UART_LSR_OE)
+                                up->port.icount.overrun++;
+
+                        /*
+                         * Mask off conditions which should be ingored.
+                         */
+                        *status &= up->port.read_status_mask;
+
+                        if (up->port.cons != NULL &&
+                            up->port.line == up->port.cons->index) {
+                                /* Recover the break flag from console xmit */
+                                *status |= up->lsr_break_flag;
+                                up->lsr_break_flag = 0;
+                        }
+
+                        if (*status & UART_LSR_BI) {
+                                flag = TTY_BREAK;
+                        } else if (*status & UART_LSR_PE)
+                                flag = TTY_PARITY;
+                        else if (*status & UART_LSR_FE)
+                                flag = TTY_FRAME;
+                }
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        goto ignore_char;
+                if ((*status & up->port.ignore_status_mask) == 0)
+                        tty_insert_flip_char(tty, ch, flag);
+                if (*status & UART_LSR_OE)
+                        /*
+                         * Overrun is special, since it's reported
+                         * immediately, and doesn't affect the current
+                         * character.
+                         */
+                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+        ignore_char:
+                *status = serial_inp(up, UART_LSR);
+        } while ((*status & UART_LSR_DR) && (max_count-- > 0));
+
+        if (saw_console_brk)
+                sun_do_break();
+
+        return tty;
+}
+
+static void transmit_chars(struct uart_sunsu_port *up)
+{
+        struct circ_buf *xmit = &up->port.state->xmit;
+        int count;
+
+        if (up->port.x_char) {
+                serial_outp(up, UART_TX, up->port.x_char);
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+        if (uart_tx_stopped(&up->port)) {
+                sunsu_stop_tx(&up->port);
+                return;
+        }
+        if (uart_circ_empty(xmit)) {
+                __stop_tx(up);
+                return;
+        }
+
+        count = up->port.fifosize;
+        do {
+                serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                up->port.icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (--count > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        if (uart_circ_empty(xmit))
+                __stop_tx(up);
+}
+
+static void check_modem_status(struct uart_sunsu_port *up)
+{
+        int status;
+
+        status = serial_in(up, UART_MSR);
+
+        if ((status & UART_MSR_ANY_DELTA) == 0)
+                return;
+
+        if (status & UART_MSR_TERI)
+                up->port.icount.rng++;
+        if (status & UART_MSR_DDSR)
+                up->port.icount.dsr++;
+        if (status & UART_MSR_DDCD)
+                uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+        if (status & UART_MSR_DCTS)
+                uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+
+        wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+}
+
+static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
+{
+        struct uart_sunsu_port *up = dev_id;
+        unsigned long flags;
+        unsigned char status;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        do {
+                struct tty_struct *tty;
+
+                status = serial_inp(up, UART_LSR);
+                tty = NULL;
+                if (status & UART_LSR_DR)
+                        tty = receive_chars(up, &status);
+                check_modem_status(up);
+                if (status & UART_LSR_THRE)
+                        transmit_chars(up);
+
+                spin_unlock_irqrestore(&up->port.lock, flags);
+
+                if (tty)
+                        tty_flip_buffer_push(tty);
+
+                spin_lock_irqsave(&up->port.lock, flags);
+
+        } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return IRQ_HANDLED;
+}
+
+/* Separate interrupt handling path for keyboard/mouse ports.  */
+
+static void
+sunsu_change_speed(struct uart_port *port, unsigned int cflag,
+                   unsigned int iflag, unsigned int quot);
+
+static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
+{
+        unsigned int cur_cflag = up->cflag;
+        int quot, new_baud;
+
+        up->cflag &= ~CBAUD;
+        up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
+
+        quot = up->port.uartclk / (16 * new_baud);
+
+        sunsu_change_speed(&up->port, up->cflag, 0, quot);
+}
+
+static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
+{
+        do {
+                unsigned char ch = serial_inp(up, UART_RX);
+
+                /* Stop-A is handled by drivers/char/keyboard.c now. */
+                if (up->su_type == SU_PORT_KBD) {
+#ifdef CONFIG_SERIO
+                        serio_interrupt(&up->serio, ch, 0);
+#endif
+                } else if (up->su_type == SU_PORT_MS) {
+                        int ret = suncore_mouse_baud_detection(ch, is_break);
+
+                        switch (ret) {
+                        case 2:
+                                sunsu_change_mouse_baud(up);
+                                /* fallthru */
+                        case 1:
+                                break;
+
+                        case 0:
+#ifdef CONFIG_SERIO
+                                serio_interrupt(&up->serio, ch, 0);
+#endif
+                                break;
+                        };
+                }
+        } while (serial_in(up, UART_LSR) & UART_LSR_DR);
+}
+
+static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
+{
+        struct uart_sunsu_port *up = dev_id;
+
+        if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
+                unsigned char status = serial_inp(up, UART_LSR);
+
+                if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
+                        receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
+        }
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int sunsu_tx_empty(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned long flags;
+        unsigned int ret;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return ret;
+}
+
+static unsigned int sunsu_get_mctrl(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned char status;
+        unsigned int ret;
+
+        status = serial_in(up, UART_MSR);
+
+        ret = 0;
+        if (status & UART_MSR_DCD)
+                ret |= TIOCM_CAR;
+        if (status & UART_MSR_RI)
+                ret |= TIOCM_RNG;
+        if (status & UART_MSR_DSR)
+                ret |= TIOCM_DSR;
+        if (status & UART_MSR_CTS)
+                ret |= TIOCM_CTS;
+        return ret;
+}
+
+static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned char mcr = 0;
+
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        serial_out(up, UART_MCR, mcr);
+}
+
+static void sunsu_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned long flags;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (break_state == -1)
+                up->lcr |= UART_LCR_SBC;
+        else
+                up->lcr &= ~UART_LCR_SBC;
+        serial_out(up, UART_LCR, up->lcr);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int sunsu_startup(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned long flags;
+        int retval;
+
+        if (up->port.type == PORT_16C950) {
+                /* Wake up and initialize UART */
+                up->acr = 0;
+                serial_outp(up, UART_LCR, 0xBF);
+                serial_outp(up, UART_EFR, UART_EFR_ECB);
+                serial_outp(up, UART_IER, 0);
+                serial_outp(up, UART_LCR, 0);
+                serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
+                serial_outp(up, UART_LCR, 0xBF);
+                serial_outp(up, UART_EFR, UART_EFR_ECB);
+                serial_outp(up, UART_LCR, 0);
+        }
+
+#ifdef CONFIG_SERIAL_8250_RSA
+        /*
+         * If this is an RSA port, see if we can kick it up to the
+         * higher speed clock.
+         */
+        enable_rsa(up);
+#endif
+
+        /*
+         * Clear the FIFO buffers and disable them.
+         * (they will be reenabled in set_termios())
+         */
+        if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
+                serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+                serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                                UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+                serial_outp(up, UART_FCR, 0);
+        }
+
+        /*
+         * Clear the interrupt registers.
+         */
+        (void) serial_inp(up, UART_LSR);
+        (void) serial_inp(up, UART_RX);
+        (void) serial_inp(up, UART_IIR);
+        (void) serial_inp(up, UART_MSR);
+
+        /*
+         * At this point, there's no way the LSR could still be 0xff;
+         * if it is, then bail out, because there's likely no UART
+         * here.
+         */
+        if (!(up->port.flags & UPF_BUGGY_UART) &&
+            (serial_inp(up, UART_LSR) == 0xff)) {
+                printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
+                return -ENODEV;
+        }
+
+        if (up->su_type != SU_PORT_PORT) {
+                retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
+                                     IRQF_SHARED, su_typev[up->su_type], up);
+        } else {
+                retval = request_irq(up->port.irq, sunsu_serial_interrupt,
+                                     IRQF_SHARED, su_typev[up->su_type], up);
+        }
+        if (retval) {
+                printk("su: Cannot register IRQ %d\n", up->port.irq);
+                return retval;
+        }
+
+        /*
+         * Now, initialize the UART
+         */
+        serial_outp(up, UART_LCR, UART_LCR_WLEN8);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        up->port.mctrl |= TIOCM_OUT2;
+
+        sunsu_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Finally, enable interrupts.  Note: Modem status interrupts
+         * are set via set_termios(), which will be occurring imminently
+         * anyway, so we don't enable them here.
+         */
+        up->ier = UART_IER_RLSI | UART_IER_RDI;
+        serial_outp(up, UART_IER, up->ier);
+
+        if (up->port.flags & UPF_FOURPORT) {
+                unsigned int icp;
+                /*
+                 * Enable interrupts on the AST Fourport board
+                 */
+                icp = (up->port.iobase & 0xfe0) | 0x01f;
+                outb_p(0x80, icp);
+                (void) inb_p(icp);
+        }
+
+        /*
+         * And clear the interrupt registers again for luck.
+         */
+        (void) serial_inp(up, UART_LSR);
+        (void) serial_inp(up, UART_RX);
+        (void) serial_inp(up, UART_IIR);
+        (void) serial_inp(up, UART_MSR);
+
+        return 0;
+}
+
+static void sunsu_shutdown(struct uart_port *port)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned long flags;
+
+        /*
+         * Disable interrupts from this port
+         */
+        up->ier = 0;
+        serial_outp(up, UART_IER, 0);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (up->port.flags & UPF_FOURPORT) {
+                /* reset interrupts on the AST Fourport board */
+                inb((up->port.iobase & 0xfe0) | 0x1f);
+                up->port.mctrl |= TIOCM_OUT1;
+        } else
+                up->port.mctrl &= ~TIOCM_OUT2;
+
+        sunsu_set_mctrl(&up->port, up->port.mctrl);
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        /*
+         * Disable break condition and FIFOs
+         */
+        serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+                                  UART_FCR_CLEAR_RCVR |
+                                  UART_FCR_CLEAR_XMIT);
+        serial_outp(up, UART_FCR, 0);
+
+#ifdef CONFIG_SERIAL_8250_RSA
+        /*
+         * Reset the RSA board back to 115kbps compat mode.
+         */
+        disable_rsa(up);
+#endif
+
+        /*
+         * Read data port to reset things.
+         */
+        (void) serial_in(up, UART_RX);
+
+        free_irq(up->port.irq, up);
+}
+
+static void
+sunsu_change_speed(struct uart_port *port, unsigned int cflag,
+                   unsigned int iflag, unsigned int quot)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+        unsigned char cval, fcr = 0;
+        unsigned long flags;
+
+        switch (cflag & CSIZE) {
+        case CS5:
+                cval = 0x00;
+                break;
+        case CS6:
+                cval = 0x01;
+                break;
+        case CS7:
+                cval = 0x02;
+                break;
+        default:
+        case CS8:
+                cval = 0x03;
+                break;
+        }
+
+        if (cflag & CSTOPB)
+                cval |= 0x04;
+        if (cflag & PARENB)
+                cval |= UART_LCR_PARITY;
+        if (!(cflag & PARODD))
+                cval |= UART_LCR_EPAR;
+#ifdef CMSPAR
+        if (cflag & CMSPAR)
+                cval |= UART_LCR_SPAR;
+#endif
+
+        /*
+         * Work around a bug in the Oxford Semiconductor 952 rev B
+         * chip which causes it to seriously miscalculate baud rates
+         * when DLL is 0.
+         */
+        if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
+            up->rev == 0x5201)
+                quot ++;
+
+        if (uart_config[up->port.type].flags & UART_USE_FIFO) {
+                if ((up->port.uartclk / quot) < (2400 * 16))
+                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
+#ifdef CONFIG_SERIAL_8250_RSA
+                else if (up->port.type == PORT_RSA)
+                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
+#endif
+                else
+                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
+        }
+        if (up->port.type == PORT_16750)
+                fcr |= UART_FCR7_64BYTE;
+
+        /*
+         * Ok, we're now changing the port state.  Do it with
+         * interrupts disabled.
+         */
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
+
+        up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+        if (iflag & INPCK)
+                up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= UART_LSR_BI;
+
+        /*
+         * Characteres to ignore
+         */
+        up->port.ignore_status_mask = 0;
+        if (iflag & IGNPAR)
+                up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+        if (iflag & IGNBRK) {
+                up->port.ignore_status_mask |= UART_LSR_BI;
+                /*
+                 * If we're ignoring parity and break indicators,
+                 * ignore overruns too (for real raw support).
+                 */
+                if (iflag & IGNPAR)
+                        up->port.ignore_status_mask |= UART_LSR_OE;
+        }
+
+        /*
+         * ignore all characters if CREAD is not set
+         */
+        if ((cflag & CREAD) == 0)
+                up->port.ignore_status_mask |= UART_LSR_DR;
+
+        /*
+         * CTS flow control flag and modem status interrupts
+         */
+        up->ier &= ~UART_IER_MSI;
+        if (UART_ENABLE_MS(&up->port, cflag))
+                up->ier |= UART_IER_MSI;
+
+        serial_out(up, UART_IER, up->ier);
+
+        if (uart_config[up->port.type].flags & UART_STARTECH) {
+                serial_outp(up, UART_LCR, 0xBF);
+                serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
+        }
+        serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+        serial_outp(up, UART_DLL, quot & 0xff);         /* LS of divisor */
+        serial_outp(up, UART_DLM, quot >> 8);           /* MS of divisor */
+        if (up->port.type == PORT_16750)
+                serial_outp(up, UART_FCR, fcr);         /* set fcr */
+        serial_outp(up, UART_LCR, cval);                /* reset DLAB */
+        up->lcr = cval;                                 /* Save LCR */
+        if (up->port.type != PORT_16750) {
+                if (fcr & UART_FCR_ENABLE_FIFO) {
+                        /* emulated UARTs (Lucent Venus 167x) need two steps */
+                        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+                }
+                serial_outp(up, UART_FCR, fcr);         /* set fcr */
+        }
+
+        up->cflag = cflag;
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
+                  struct ktermios *old)
+{
+        unsigned int baud, quot;
+
+        /*
+         * Ask the core to calculate the divisor for us.
+         */
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
+        quot = uart_get_divisor(port, baud);
+
+        sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
+}
+
+static void sunsu_release_port(struct uart_port *port)
+{
+}
+
+static int sunsu_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void sunsu_config_port(struct uart_port *port, int flags)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
+
+        if (flags & UART_CONFIG_TYPE) {
+                /*
+                 * We are supposed to call autoconfig here, but this requires
+                 * splitting all the OBP probing crap from the UART probing.
+                 * We'll do it when we kill sunsu.c altogether.
+                 */
+                port->type = up->type_probed;   /* XXX */
+        }
+}
+
+static int
+sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+static const char *
+sunsu_type(struct uart_port *port)
+{
+        int type = port->type;
+
+        if (type >= ARRAY_SIZE(uart_config))
+                type = 0;
+        return uart_config[type].name;
+}
+
+static struct uart_ops sunsu_pops = {
+        .tx_empty       = sunsu_tx_empty,
+        .set_mctrl      = sunsu_set_mctrl,
+        .get_mctrl      = sunsu_get_mctrl,
+        .stop_tx        = sunsu_stop_tx,
+        .start_tx       = sunsu_start_tx,
+        .stop_rx        = sunsu_stop_rx,
+        .enable_ms      = sunsu_enable_ms,
+        .break_ctl      = sunsu_break_ctl,
+        .startup        = sunsu_startup,
+        .shutdown       = sunsu_shutdown,
+        .set_termios    = sunsu_set_termios,
+        .type           = sunsu_type,
+        .release_port   = sunsu_release_port,
+        .request_port   = sunsu_request_port,
+        .config_port    = sunsu_config_port,
+        .verify_port    = sunsu_verify_port,
+};
+
+#define UART_NR 4
+
+static struct uart_sunsu_port sunsu_ports[UART_NR];
+
+#ifdef CONFIG_SERIO
+
+static DEFINE_SPINLOCK(sunsu_serio_lock);
+
+static int sunsu_serio_write(struct serio *serio, unsigned char ch)
+{
+        struct uart_sunsu_port *up = serio->port_data;
+        unsigned long flags;
+        int lsr;
+
+        spin_lock_irqsave(&sunsu_serio_lock, flags);
+
+        do {
+                lsr = serial_in(up, UART_LSR);
+        } while (!(lsr & UART_LSR_THRE));
+
+        /* Send the character out. */
+        serial_out(up, UART_TX, ch);
+
+        spin_unlock_irqrestore(&sunsu_serio_lock, flags);
+
+        return 0;
+}
+
+static int sunsu_serio_open(struct serio *serio)
+{
+        struct uart_sunsu_port *up = serio->port_data;
+        unsigned long flags;
+        int ret;
+
+        spin_lock_irqsave(&sunsu_serio_lock, flags);
+        if (!up->serio_open) {
+                up->serio_open = 1;
+                ret = 0;
+        } else
+                ret = -EBUSY;
+        spin_unlock_irqrestore(&sunsu_serio_lock, flags);
+
+        return ret;
+}
+
+static void sunsu_serio_close(struct serio *serio)
+{
+        struct uart_sunsu_port *up = serio->port_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sunsu_serio_lock, flags);
+        up->serio_open = 0;
+        spin_unlock_irqrestore(&sunsu_serio_lock, flags);
+}
+
+#endif /* CONFIG_SERIO */
+
+static void sunsu_autoconfig(struct uart_sunsu_port *up)
+{
+        unsigned char status1, status2, scratch, scratch2, scratch3;
+        unsigned char save_lcr, save_mcr;
+        unsigned long flags;
+
+        if (up->su_type == SU_PORT_NONE)
+                return;
+
+        up->type_probed = PORT_UNKNOWN;
+        up->port.iotype = UPIO_MEM;
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        if (!(up->port.flags & UPF_BUGGY_UART)) {
+                /*
+                 * Do a simple existence test first; if we fail this, there's
+                 * no point trying anything else.
+                 *
+                 * 0x80 is used as a nonsense port to prevent against false
+                 * positives due to ISA bus float.  The assumption is that
+                 * 0x80 is a non-existent port; which should be safe since
+                 * include/asm/io.h also makes this assumption.
+                 */
+                scratch = serial_inp(up, UART_IER);
+                serial_outp(up, UART_IER, 0);
+#ifdef __i386__
+                outb(0xff, 0x080);
+#endif
+                scratch2 = serial_inp(up, UART_IER);
+                serial_outp(up, UART_IER, 0x0f);
+#ifdef __i386__
+                outb(0, 0x080);
+#endif
+                scratch3 = serial_inp(up, UART_IER);
+                serial_outp(up, UART_IER, scratch);
+                if (scratch2 != 0 || scratch3 != 0x0F)
+                        goto out;       /* We failed; there's nothing here */
+        }
+
+        save_mcr = serial_in(up, UART_MCR);
+        save_lcr = serial_in(up, UART_LCR);
+
+        /* 
+         * Check to see if a UART is really there.  Certain broken
+         * internal modems based on the Rockwell chipset fail this
+         * test, because they apparently don't implement the loopback
+         * test mode.  So this test is skipped on the COM 1 through
+         * COM 4 ports.  This *should* be safe, since no board
+         * manufacturer would be stupid enough to design a board
+         * that conflicts with COM 1-4 --- we hope!
+         */
+        if (!(up->port.flags & UPF_SKIP_TEST)) {
+                serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
+                status1 = serial_inp(up, UART_MSR) & 0xF0;
+                serial_outp(up, UART_MCR, save_mcr);
+                if (status1 != 0x90)
+                        goto out;       /* We failed loopback test */
+        }
+        serial_outp(up, UART_LCR, 0xBF);        /* set up for StarTech test */
+        serial_outp(up, UART_EFR, 0);           /* EFR is the same as FCR */
+        serial_outp(up, UART_LCR, 0);
+        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        scratch = serial_in(up, UART_IIR) >> 6;
+        switch (scratch) {
+                case 0:
+                        up->port.type = PORT_16450;
+                        break;
+                case 1:
+                        up->port.type = PORT_UNKNOWN;
+                        break;
+                case 2:
+                        up->port.type = PORT_16550;
+                        break;
+                case 3:
+                        up->port.type = PORT_16550A;
+                        break;
+        }
+        if (up->port.type == PORT_16550A) {
+                /* Check for Startech UART's */
+                serial_outp(up, UART_LCR, UART_LCR_DLAB);
+                if (serial_in(up, UART_EFR) == 0) {
+                        up->port.type = PORT_16650;
+                } else {
+                        serial_outp(up, UART_LCR, 0xBF);
+                        if (serial_in(up, UART_EFR) == 0)
+                                up->port.type = PORT_16650V2;
+                }
+        }
+        if (up->port.type == PORT_16550A) {
+                /* Check for TI 16750 */
+                serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
+                serial_outp(up, UART_FCR,
+                            UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
+                scratch = serial_in(up, UART_IIR) >> 5;
+                if (scratch == 7) {
+                        /*
+                         * If this is a 16750, and not a cheap UART
+                         * clone, then it should only go into 64 byte
+                         * mode if the UART_FCR7_64BYTE bit was set
+                         * while UART_LCR_DLAB was latched.
+                         */
+                        serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+                        serial_outp(up, UART_LCR, 0);
+                        serial_outp(up, UART_FCR,
+                                    UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
+                        scratch = serial_in(up, UART_IIR) >> 5;
+                        if (scratch == 6)
+                                up->port.type = PORT_16750;
+                }
+                serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
+        }
+        serial_outp(up, UART_LCR, save_lcr);
+        if (up->port.type == PORT_16450) {
+                scratch = serial_in(up, UART_SCR);
+                serial_outp(up, UART_SCR, 0xa5);
+                status1 = serial_in(up, UART_SCR);
+                serial_outp(up, UART_SCR, 0x5a);
+                status2 = serial_in(up, UART_SCR);
+                serial_outp(up, UART_SCR, scratch);
+
+                if ((status1 != 0xa5) || (status2 != 0x5a))
+                        up->port.type = PORT_8250;
+        }
+
+        up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
+
+        if (up->port.type == PORT_UNKNOWN)
+                goto out;
+        up->type_probed = up->port.type;        /* XXX */
+
+        /*
+         * Reset the UART.
+         */
+#ifdef CONFIG_SERIAL_8250_RSA
+        if (up->port.type == PORT_RSA)
+                serial_outp(up, UART_RSA_FRR, 0);
+#endif
+        serial_outp(up, UART_MCR, save_mcr);
+        serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
+                                     UART_FCR_CLEAR_RCVR |
+                                     UART_FCR_CLEAR_XMIT));
+        serial_outp(up, UART_FCR, 0);
+        (void)serial_in(up, UART_RX);
+        serial_outp(up, UART_IER, 0);
+
+out:
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static struct uart_driver sunsu_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "sunsu",
+        .dev_name               = "ttyS",
+        .major                  = TTY_MAJOR,
+};
+
+static int __devinit sunsu_kbd_ms_init(struct uart_sunsu_port *up)
+{
+        int quot, baud;
+#ifdef CONFIG_SERIO
+        struct serio *serio;
+#endif
+
+        if (up->su_type == SU_PORT_KBD) {
+                up->cflag = B1200 | CS8 | CLOCAL | CREAD;
+                baud = 1200;
+        } else {
+                up->cflag = B4800 | CS8 | CLOCAL | CREAD;
+                baud = 4800;
+        }
+        quot = up->port.uartclk / (16 * baud);
+
+        sunsu_autoconfig(up);
+        if (up->port.type == PORT_UNKNOWN)
+                return -ENODEV;
+
+        printk("%s: %s port at %llx, irq %u\n",
+               up->port.dev->of_node->full_name,
+               (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
+               (unsigned long long) up->port.mapbase,
+               up->port.irq);
+
+#ifdef CONFIG_SERIO
+        serio = &up->serio;
+        serio->port_data = up;
+
+        serio->id.type = SERIO_RS232;
+        if (up->su_type == SU_PORT_KBD) {
+                serio->id.proto = SERIO_SUNKBD;
+                strlcpy(serio->name, "sukbd", sizeof(serio->name));
+        } else {
+                serio->id.proto = SERIO_SUN;
+                serio->id.extra = 1;
+                strlcpy(serio->name, "sums", sizeof(serio->name));
+        }
+        strlcpy(serio->phys,
+                (!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
+                sizeof(serio->phys));
+
+        serio->write = sunsu_serio_write;
+        serio->open = sunsu_serio_open;
+        serio->close = sunsu_serio_close;
+        serio->dev.parent = up->port.dev;
+
+        serio_register_port(serio);
+#endif
+
+        sunsu_change_speed(&up->port, up->cflag, 0, quot);
+
+        sunsu_startup(&up->port);
+        return 0;
+}
+
+/*
+ * ------------------------------------------------------------
+ * Serial console driver
+ * ------------------------------------------------------------
+ */
+
+#ifdef CONFIG_SERIAL_SUNSU_CONSOLE
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+/*
+ *      Wait for transmitter & holding register to empty
+ */
+static __inline__ void wait_for_xmitr(struct uart_sunsu_port *up)
+{
+        unsigned int status, tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        do {
+                status = serial_in(up, UART_LSR);
+
+                if (status & UART_LSR_BI)
+                        up->lsr_break_flag = UART_LSR_BI;
+
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+
+        /* Wait up to 1s for flow control if necessary */
+        if (up->port.flags & UPF_CONS_FLOW) {
+                tmout = 1000000;
+                while (--tmout &&
+                       ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
+                        udelay(1);
+        }
+}
+
+static void sunsu_console_putchar(struct uart_port *port, int ch)
+{
+        struct uart_sunsu_port *up = (struct uart_sunsu_port *)port;
+
+        wait_for_xmitr(up);
+        serial_out(up, UART_TX, ch);
+}
+
+/*
+ *      Print a string to the serial port trying not to disturb
+ *      any possible real use of the port...
+ */
+static void sunsu_console_write(struct console *co, const char *s,
+                                unsigned int count)
+{
+        struct uart_sunsu_port *up = &sunsu_ports[co->index];
+        unsigned long flags;
+        unsigned int ier;
+        int locked = 1;
+
+        local_irq_save(flags);
+        if (up->port.sysrq) {
+                locked = 0;
+        } else if (oops_in_progress) {
+                locked = spin_trylock(&up->port.lock);
+        } else
+                spin_lock(&up->port.lock);
+
+        /*
+         *      First save the UER then disable the interrupts
+         */
+        ier = serial_in(up, UART_IER);
+        serial_out(up, UART_IER, 0);
+
+        uart_console_write(&up->port, s, count, sunsu_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and restore the IER
+         */
+        wait_for_xmitr(up);
+        serial_out(up, UART_IER, ier);
+
+        if (locked)
+                spin_unlock(&up->port.lock);
+        local_irq_restore(flags);
+}
+
+/*
+ *      Setup initial baud/bits/parity. We do two things here:
+ *      - construct a cflag setting for the first su_open()
+ *      - initialize the serial port
+ *      Return non-zero if we didn't find a serial port.
+ */
+static int __init sunsu_console_setup(struct console *co, char *options)
+{
+        static struct ktermios dummy;
+        struct ktermios termios;
+        struct uart_port *port;
+
+        printk("Console: ttyS%d (SU)\n",
+               (sunsu_reg.minor - 64) + co->index);
+
+        /*
+         * Check whether an invalid uart number has been specified, and
+         * if so, search for the first available port that does have
+         * console support.
+         */
+        if (co->index >= UART_NR)
+                co->index = 0;
+        port = &sunsu_ports[co->index].port;
+
+        /*
+         * Temporary fix.
+         */
+        spin_lock_init(&port->lock);
+
+        /* Get firmware console settings.  */
+        sunserial_console_termios(co, port->dev->of_node);
+
+        memset(&termios, 0, sizeof(struct ktermios));
+        termios.c_cflag = co->cflag;
+        port->mctrl |= TIOCM_DTR;
+        port->ops->set_termios(port, &termios, &dummy);
+
+        return 0;
+}
+
+static struct console sunsu_console = {
+        .name   =       "ttyS",
+        .write  =       sunsu_console_write,
+        .device =       uart_console_device,
+        .setup  =       sunsu_console_setup,
+        .flags  =       CON_PRINTBUFFER,
+        .index  =       -1,
+        .data   =       &sunsu_reg,
+};
+
+/*
+ *      Register console.
+ */
+
+static inline struct console *SUNSU_CONSOLE(void)
+{
+        return &sunsu_console;
+}
+#else
+#define SUNSU_CONSOLE()                 (NULL)
+#define sunsu_serial_console_init()     do { } while (0)
+#endif
+
+static enum su_type __devinit su_get_type(struct device_node *dp)
+{
+        struct device_node *ap = of_find_node_by_path("/aliases");
+
+        if (ap) {
+                const char *keyb = of_get_property(ap, "keyboard", NULL);
+                const char *ms = of_get_property(ap, "mouse", NULL);
+
+                if (keyb) {
+                        if (dp == of_find_node_by_path(keyb))
+                                return SU_PORT_KBD;
+                }
+                if (ms) {
+                        if (dp == of_find_node_by_path(ms))
+                                return SU_PORT_MS;
+                }
+        }
+
+        return SU_PORT_PORT;
+}
+
+static int __devinit su_probe(struct platform_device *op)
+{
+        static int inst;
+        struct device_node *dp = op->dev.of_node;
+        struct uart_sunsu_port *up;
+        struct resource *rp;
+        enum su_type type;
+        bool ignore_line;
+        int err;
+
+        type = su_get_type(dp);
+        if (type == SU_PORT_PORT) {
+                if (inst >= UART_NR)
+                        return -EINVAL;
+                up = &sunsu_ports[inst];
+        } else {
+                up = kzalloc(sizeof(*up), GFP_KERNEL);
+                if (!up)
+                        return -ENOMEM;
+        }
+
+        up->port.line = inst;
+
+        spin_lock_init(&up->port.lock);
+
+        up->su_type = type;
+
+        rp = &op->resource[0];
+        up->port.mapbase = rp->start;
+        up->reg_size = (rp->end - rp->start) + 1;
+        up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
+        if (!up->port.membase) {
+                if (type != SU_PORT_PORT)
+                        kfree(up);
+                return -ENOMEM;
+        }
+
+        up->port.irq = op->archdata.irqs[0];
+
+        up->port.dev = &op->dev;
+
+        up->port.type = PORT_UNKNOWN;
+        up->port.uartclk = (SU_BASE_BAUD * 16);
+
+        err = 0;
+        if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
+                err = sunsu_kbd_ms_init(up);
+                if (err) {
+                        of_iounmap(&op->resource[0],
+                                   up->port.membase, up->reg_size);
+                        kfree(up);
+                        return err;
+                }
+                dev_set_drvdata(&op->dev, up);
+
+                return 0;
+        }
+
+        up->port.flags |= UPF_BOOT_AUTOCONF;
+
+        sunsu_autoconfig(up);
+
+        err = -ENODEV;
+        if (up->port.type == PORT_UNKNOWN)
+                goto out_unmap;
+
+        up->port.ops = &sunsu_pops;
+
+        ignore_line = false;
+        if (!strcmp(dp->name, "rsc-console") ||
+            !strcmp(dp->name, "lom-console"))
+                ignore_line = true;
+
+        sunserial_console_match(SUNSU_CONSOLE(), dp,
+                                &sunsu_reg, up->port.line,
+                                ignore_line);
+        err = uart_add_one_port(&sunsu_reg, &up->port);
+        if (err)
+                goto out_unmap;
+
+        dev_set_drvdata(&op->dev, up);
+
+        inst++;
+
+        return 0;
+
+out_unmap:
+        of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
+        return err;
+}
+
+static int __devexit su_remove(struct platform_device *op)
+{
+        struct uart_sunsu_port *up = dev_get_drvdata(&op->dev);
+        bool kbdms = false;
+
+        if (up->su_type == SU_PORT_MS ||
+            up->su_type == SU_PORT_KBD)
+                kbdms = true;
+
+        if (kbdms) {
+#ifdef CONFIG_SERIO
+                serio_unregister_port(&up->serio);
+#endif
+        } else if (up->port.type != PORT_UNKNOWN)
+                uart_remove_one_port(&sunsu_reg, &up->port);
+
+        if (up->port.membase)
+                of_iounmap(&op->resource[0], up->port.membase, up->reg_size);
+
+        if (kbdms)
+                kfree(up);
+
+        dev_set_drvdata(&op->dev, NULL);
+
+        return 0;
+}
+
+static const struct of_device_id su_match[] = {
+        {
+                .name = "su",
+        },
+        {
+                .name = "su_pnp",
+        },
+        {
+                .name = "serial",
+                .compatible = "su",
+        },
+        {
+                .type = "serial",
+                .compatible = "su",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, su_match);
+
+static struct platform_driver su_driver = {
+        .driver = {
+                .name = "su",
+                .owner = THIS_MODULE,
+                .of_match_table = su_match,
+        },
+        .probe          = su_probe,
+        .remove         = __devexit_p(su_remove),
+};
+
+static int __init sunsu_init(void)
+{
+        struct device_node *dp;
+        int err;
+        int num_uart = 0;
+
+        for_each_node_by_name(dp, "su") {
+                if (su_get_type(dp) == SU_PORT_PORT)
+                        num_uart++;
+        }
+        for_each_node_by_name(dp, "su_pnp") {
+                if (su_get_type(dp) == SU_PORT_PORT)
+                        num_uart++;
+        }
+        for_each_node_by_name(dp, "serial") {
+                if (of_device_is_compatible(dp, "su")) {
+                        if (su_get_type(dp) == SU_PORT_PORT)
+                                num_uart++;
+                }
+        }
+        for_each_node_by_type(dp, "serial") {
+                if (of_device_is_compatible(dp, "su")) {
+                        if (su_get_type(dp) == SU_PORT_PORT)
+                                num_uart++;
+                }
+        }
+
+        if (num_uart) {
+                err = sunserial_register_minors(&sunsu_reg, num_uart);
+                if (err)
+                        return err;
+        }
+
+        err = platform_driver_register(&su_driver);
+        if (err && num_uart)
+                sunserial_unregister_minors(&sunsu_reg, num_uart);
+
+        return err;
+}
+
+static void __exit sunsu_exit(void)
+{
+        if (sunsu_reg.nr)
+                sunserial_unregister_minors(&sunsu_reg, sunsu_reg.nr);
+}
+
+module_init(sunsu_init);
+module_exit(sunsu_exit);
+
+MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
+MODULE_DESCRIPTION("Sun SU serial port driver");
+MODULE_VERSION("2.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
new file mode 100644
index 000000000000..8e916e76b7b5
--- /dev/null
+++ b/drivers/tty/serial/sunzilog.c
@@ -0,0 +1,1655 @@
+/* sunzilog.c: Zilog serial driver for Sparc systems.
+ *
+ * Driver for Zilog serial chips found on Sun workstations and
+ * servers.  This driver could actually be made more generic.
+ *
+ * This is based on the old drivers/sbus/char/zs.c code.  A lot
+ * of code has been simply moved over directly from there but
+ * much has been rewritten.  Credits therefore go out to Eddie
+ * C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
+ * work there.
+ *
+ * Copyright (C) 2002, 2006, 2007 David S. Miller (davem@davemloft.net)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/circ_buf.h>
+#include <linux/serial.h>
+#include <linux/sysrq.h>
+#include <linux/console.h>
+#include <linux/spinlock.h>
+#ifdef CONFIG_SERIO
+#include <linux/serio.h>
+#endif
+#include <linux/init.h>
+#include <linux/of_device.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/prom.h>
+
+#if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/serial_core.h>
+
+#include "suncore.h"
+#include "sunzilog.h"
+
+/* On 32-bit sparcs we need to delay after register accesses
+ * to accommodate sun4 systems, but we do not need to flush writes.
+ * On 64-bit sparc we only need to flush single writes to ensure
+ * completion.
+ */
+#ifndef CONFIG_SPARC64
+#define ZSDELAY()               udelay(5)
+#define ZSDELAY_LONG()          udelay(20)
+#define ZS_WSYNC(channel)       do { } while (0)
+#else
+#define ZSDELAY()
+#define ZSDELAY_LONG()
+#define ZS_WSYNC(__channel) \
+        readb(&((__channel)->control))
+#endif
+
+#define ZS_CLOCK                4915200 /* Zilog input clock rate. */
+#define ZS_CLOCK_DIVISOR        16      /* Divisor this driver uses. */
+
+/*
+ * We wrap our port structure around the generic uart_port.
+ */
+struct uart_sunzilog_port {
+        struct uart_port                port;
+
+        /* IRQ servicing chain.  */
+        struct uart_sunzilog_port       *next;
+
+        /* Current values of Zilog write registers.  */
+        unsigned char                   curregs[NUM_ZSREGS];
+
+        unsigned int                    flags;
+#define SUNZILOG_FLAG_CONS_KEYB         0x00000001
+#define SUNZILOG_FLAG_CONS_MOUSE        0x00000002
+#define SUNZILOG_FLAG_IS_CONS           0x00000004
+#define SUNZILOG_FLAG_IS_KGDB           0x00000008
+#define SUNZILOG_FLAG_MODEM_STATUS      0x00000010
+#define SUNZILOG_FLAG_IS_CHANNEL_A      0x00000020
+#define SUNZILOG_FLAG_REGS_HELD         0x00000040
+#define SUNZILOG_FLAG_TX_STOPPED        0x00000080
+#define SUNZILOG_FLAG_TX_ACTIVE         0x00000100
+#define SUNZILOG_FLAG_ESCC              0x00000200
+#define SUNZILOG_FLAG_ISR_HANDLER       0x00000400
+
+        unsigned int cflag;
+
+        unsigned char                   parity_mask;
+        unsigned char                   prev_status;
+
+#ifdef CONFIG_SERIO
+        struct serio                    serio;
+        int                             serio_open;
+#endif
+};
+
+static void sunzilog_putchar(struct uart_port *port, int ch);
+
+#define ZILOG_CHANNEL_FROM_PORT(PORT)   ((struct zilog_channel __iomem *)((PORT)->membase))
+#define UART_ZILOG(PORT)                ((struct uart_sunzilog_port *)(PORT))
+
+#define ZS_IS_KEYB(UP)  ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
+#define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
+#define ZS_IS_CONS(UP)  ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
+#define ZS_IS_KGDB(UP)  ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
+#define ZS_WANTS_MODEM_STATUS(UP)       ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
+#define ZS_IS_CHANNEL_A(UP)     ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
+#define ZS_REGS_HELD(UP)        ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
+#define ZS_TX_STOPPED(UP)       ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
+#define ZS_TX_ACTIVE(UP)        ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
+
+/* Reading and writing Zilog8530 registers.  The delays are to make this
+ * driver work on the Sun4 which needs a settling delay after each chip
+ * register access, other machines handle this in hardware via auxiliary
+ * flip-flops which implement the settle time we do in software.
+ *
+ * The port lock must be held and local IRQs must be disabled
+ * when {read,write}_zsreg is invoked.
+ */
+static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
+                                unsigned char reg)
+{
+        unsigned char retval;
+
+        writeb(reg, &channel->control);
+        ZSDELAY();
+        retval = readb(&channel->control);
+        ZSDELAY();
+
+        return retval;
+}
+
+static void write_zsreg(struct zilog_channel __iomem *channel,
+                        unsigned char reg, unsigned char value)
+{
+        writeb(reg, &channel->control);
+        ZSDELAY();
+        writeb(value, &channel->control);
+        ZSDELAY();
+}
+
+static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
+{
+        int i;
+
+        for (i = 0; i < 32; i++) {
+                unsigned char regval;
+
+                regval = readb(&channel->control);
+                ZSDELAY();
+                if (regval & Rx_CH_AV)
+                        break;
+
+                regval = read_zsreg(channel, R1);
+                readb(&channel->data);
+                ZSDELAY();
+
+                if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+                        writeb(ERR_RES, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+                }
+        }
+}
+
+/* This function must only be called when the TX is not busy.  The UART
+ * port lock must be held and local interrupts disabled.
+ */
+static int __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
+{
+        int i;
+        int escc;
+        unsigned char r15;
+
+        /* Let pending transmits finish.  */
+        for (i = 0; i < 1000; i++) {
+                unsigned char stat = read_zsreg(channel, R1);
+                if (stat & ALL_SNT)
+                        break;
+                udelay(100);
+        }
+
+        writeb(ERR_RES, &channel->control);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+
+        sunzilog_clear_fifo(channel);
+
+        /* Disable all interrupts.  */
+        write_zsreg(channel, R1,
+                    regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
+
+        /* Set parity, sync config, stop bits, and clock divisor.  */
+        write_zsreg(channel, R4, regs[R4]);
+
+        /* Set misc. TX/RX control bits.  */
+        write_zsreg(channel, R10, regs[R10]);
+
+        /* Set TX/RX controls sans the enable bits.  */
+        write_zsreg(channel, R3, regs[R3] & ~RxENAB);
+        write_zsreg(channel, R5, regs[R5] & ~TxENAB);
+
+        /* Synchronous mode config.  */
+        write_zsreg(channel, R6, regs[R6]);
+        write_zsreg(channel, R7, regs[R7]);
+
+        /* Don't mess with the interrupt vector (R2, unused by us) and
+         * master interrupt control (R9).  We make sure this is setup
+         * properly at probe time then never touch it again.
+         */
+
+        /* Disable baud generator.  */
+        write_zsreg(channel, R14, regs[R14] & ~BRENAB);
+
+        /* Clock mode control.  */
+        write_zsreg(channel, R11, regs[R11]);
+
+        /* Lower and upper byte of baud rate generator divisor.  */
+        write_zsreg(channel, R12, regs[R12]);
+        write_zsreg(channel, R13, regs[R13]);
+        
+        /* Now rewrite R14, with BRENAB (if set).  */
+        write_zsreg(channel, R14, regs[R14]);
+
+        /* External status interrupt control.  */
+        write_zsreg(channel, R15, (regs[R15] | WR7pEN) & ~FIFOEN);
+
+        /* ESCC Extension Register */
+        r15 = read_zsreg(channel, R15);
+        if (r15 & 0x01) {
+                write_zsreg(channel, R7,  regs[R7p]);
+
+                /* External status interrupt and FIFO control.  */
+                write_zsreg(channel, R15, regs[R15] & ~WR7pEN);
+                escc = 1;
+        } else {
+                 /* Clear FIFO bit case it is an issue */
+                regs[R15] &= ~FIFOEN;
+                escc = 0;
+        }
+
+        /* Reset external status interrupts.  */
+        write_zsreg(channel, R0, RES_EXT_INT); /* First Latch  */
+        write_zsreg(channel, R0, RES_EXT_INT); /* Second Latch */
+
+        /* Rewrite R3/R5, this time without enables masked.  */
+        write_zsreg(channel, R3, regs[R3]);
+        write_zsreg(channel, R5, regs[R5]);
+
+        /* Rewrite R1, this time without IRQ enabled masked.  */
+        write_zsreg(channel, R1, regs[R1]);
+
+        return escc;
+}
+
+/* Reprogram the Zilog channel HW registers with the copies found in the
+ * software state struct.  If the transmitter is busy, we defer this update
+ * until the next TX complete interrupt.  Else, we do it right now.
+ *
+ * The UART port lock must be held and local interrupts disabled.
+ */
+static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
+                                       struct zilog_channel __iomem *channel)
+{
+        if (!ZS_REGS_HELD(up)) {
+                if (ZS_TX_ACTIVE(up)) {
+                        up->flags |= SUNZILOG_FLAG_REGS_HELD;
+                } else {
+                        __load_zsregs(channel, up->curregs);
+                }
+        }
+}
+
+static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
+{
+        unsigned int cur_cflag = up->cflag;
+        int brg, new_baud;
+
+        up->cflag &= ~CBAUD;
+        up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
+
+        brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+        up->curregs[R12] = (brg & 0xff);
+        up->curregs[R13] = (brg >> 8) & 0xff;
+        sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
+}
+
+static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
+                                         unsigned char ch, int is_break)
+{
+        if (ZS_IS_KEYB(up)) {
+                /* Stop-A is handled by drivers/char/keyboard.c now. */
+#ifdef CONFIG_SERIO
+                if (up->serio_open)
+                        serio_interrupt(&up->serio, ch, 0);
+#endif
+        } else if (ZS_IS_MOUSE(up)) {
+                int ret = suncore_mouse_baud_detection(ch, is_break);
+
+                switch (ret) {
+                case 2:
+                        sunzilog_change_mouse_baud(up);
+                        /* fallthru */
+                case 1:
+                        break;
+
+                case 0:
+#ifdef CONFIG_SERIO
+                        if (up->serio_open)
+                                serio_interrupt(&up->serio, ch, 0);
+#endif
+                        break;
+                };
+        }
+}
+
+static struct tty_struct *
+sunzilog_receive_chars(struct uart_sunzilog_port *up,
+                       struct zilog_channel __iomem *channel)
+{
+        struct tty_struct *tty;
+        unsigned char ch, r1, flag;
+
+        tty = NULL;
+        if (up->port.state != NULL &&           /* Unopened serial console */
+            up->port.state->port.tty != NULL)   /* Keyboard || mouse */
+                tty = up->port.state->port.tty;
+
+        for (;;) {
+
+                r1 = read_zsreg(channel, R1);
+                if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+                        writeb(ERR_RES, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+                }
+
+                ch = readb(&channel->control);
+                ZSDELAY();
+
+                /* This funny hack depends upon BRK_ABRT not interfering
+                 * with the other bits we care about in R1.
+                 */
+                if (ch & BRK_ABRT)
+                        r1 |= BRK_ABRT;
+
+                if (!(ch & Rx_CH_AV))
+                        break;
+
+                ch = readb(&channel->data);
+                ZSDELAY();
+
+                ch &= up->parity_mask;
+
+                if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
+                        sunzilog_kbdms_receive_chars(up, ch, 0);
+                        continue;
+                }
+
+                if (tty == NULL) {
+                        uart_handle_sysrq_char(&up->port, ch);
+                        continue;
+                }
+
+                /* A real serial line, record the character and status.  */
+                flag = TTY_NORMAL;
+                up->port.icount.rx++;
+                if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
+                        if (r1 & BRK_ABRT) {
+                                r1 &= ~(PAR_ERR | CRC_ERR);
+                                up->port.icount.brk++;
+                                if (uart_handle_break(&up->port))
+                                        continue;
+                        }
+                        else if (r1 & PAR_ERR)
+                                up->port.icount.parity++;
+                        else if (r1 & CRC_ERR)
+                                up->port.icount.frame++;
+                        if (r1 & Rx_OVR)
+                                up->port.icount.overrun++;
+                        r1 &= up->port.read_status_mask;
+                        if (r1 & BRK_ABRT)
+                                flag = TTY_BREAK;
+                        else if (r1 & PAR_ERR)
+                                flag = TTY_PARITY;
+                        else if (r1 & CRC_ERR)
+                                flag = TTY_FRAME;
+                }
+                if (uart_handle_sysrq_char(&up->port, ch))
+                        continue;
+
+                if (up->port.ignore_status_mask == 0xff ||
+                    (r1 & up->port.ignore_status_mask) == 0) {
+                        tty_insert_flip_char(tty, ch, flag);
+                }
+                if (r1 & Rx_OVR)
+                        tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+        }
+
+        return tty;
+}
+
+static void sunzilog_status_handle(struct uart_sunzilog_port *up,
+                                   struct zilog_channel __iomem *channel)
+{
+        unsigned char status;
+
+        status = readb(&channel->control);
+        ZSDELAY();
+
+        writeb(RES_EXT_INT, &channel->control);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+
+        if (status & BRK_ABRT) {
+                if (ZS_IS_MOUSE(up))
+                        sunzilog_kbdms_receive_chars(up, 0, 1);
+                if (ZS_IS_CONS(up)) {
+                        /* Wait for BREAK to deassert to avoid potentially
+                         * confusing the PROM.
+                         */
+                        while (1) {
+                                status = readb(&channel->control);
+                                ZSDELAY();
+                                if (!(status & BRK_ABRT))
+                                        break;
+                        }
+                        sun_do_break();
+                        return;
+                }
+        }
+
+        if (ZS_WANTS_MODEM_STATUS(up)) {
+                if (status & SYNC)
+                        up->port.icount.dsr++;
+
+                /* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
+                 * But it does not tell us which bit has changed, we have to keep
+                 * track of this ourselves.
+                 */
+                if ((status ^ up->prev_status) ^ DCD)
+                        uart_handle_dcd_change(&up->port,
+                                               (status & DCD));
+                if ((status ^ up->prev_status) ^ CTS)
+                        uart_handle_cts_change(&up->port,
+                                               (status & CTS));
+
+                wake_up_interruptible(&up->port.state->port.delta_msr_wait);
+        }
+
+        up->prev_status = status;
+}
+
+static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
+                                    struct zilog_channel __iomem *channel)
+{
+        struct circ_buf *xmit;
+
+        if (ZS_IS_CONS(up)) {
+                unsigned char status = readb(&channel->control);
+                ZSDELAY();
+
+                /* TX still busy?  Just wait for the next TX done interrupt.
+                 *
+                 * It can occur because of how we do serial console writes.  It would
+                 * be nice to transmit console writes just like we normally would for
+                 * a TTY line. (ie. buffered and TX interrupt driven).  That is not
+                 * easy because console writes cannot sleep.  One solution might be
+                 * to poll on enough port->xmit space becoming free.  -DaveM
+                 */
+                if (!(status & Tx_BUF_EMP))
+                        return;
+        }
+
+        up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
+
+        if (ZS_REGS_HELD(up)) {
+                __load_zsregs(channel, up->curregs);
+                up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
+        }
+
+        if (ZS_TX_STOPPED(up)) {
+                up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
+                goto ack_tx_int;
+        }
+
+        if (up->port.x_char) {
+                up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
+                writeb(up->port.x_char, &channel->data);
+                ZSDELAY();
+                ZS_WSYNC(channel);
+
+                up->port.icount.tx++;
+                up->port.x_char = 0;
+                return;
+        }
+
+        if (up->port.state == NULL)
+                goto ack_tx_int;
+        xmit = &up->port.state->xmit;
+        if (uart_circ_empty(xmit))
+                goto ack_tx_int;
+
+        if (uart_tx_stopped(&up->port))
+                goto ack_tx_int;
+
+        up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
+        writeb(xmit->buf[xmit->tail], &channel->data);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+
+        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+        up->port.icount.tx++;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&up->port);
+
+        return;
+
+ack_tx_int:
+        writeb(RES_Tx_P, &channel->control);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+}
+
+static irqreturn_t sunzilog_interrupt(int irq, void *dev_id)
+{
+        struct uart_sunzilog_port *up = dev_id;
+
+        while (up) {
+                struct zilog_channel __iomem *channel
+                        = ZILOG_CHANNEL_FROM_PORT(&up->port);
+                struct tty_struct *tty;
+                unsigned char r3;
+
+                spin_lock(&up->port.lock);
+                r3 = read_zsreg(channel, R3);
+
+                /* Channel A */
+                tty = NULL;
+                if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
+                        writeb(RES_H_IUS, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+
+                        if (r3 & CHARxIP)
+                                tty = sunzilog_receive_chars(up, channel);
+                        if (r3 & CHAEXT)
+                                sunzilog_status_handle(up, channel);
+                        if (r3 & CHATxIP)
+                                sunzilog_transmit_chars(up, channel);
+                }
+                spin_unlock(&up->port.lock);
+
+                if (tty)
+                        tty_flip_buffer_push(tty);
+
+                /* Channel B */
+                up = up->next;
+                channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+                spin_lock(&up->port.lock);
+                tty = NULL;
+                if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
+                        writeb(RES_H_IUS, &channel->control);
+                        ZSDELAY();
+                        ZS_WSYNC(channel);
+
+                        if (r3 & CHBRxIP)
+                                tty = sunzilog_receive_chars(up, channel);
+                        if (r3 & CHBEXT)
+                                sunzilog_status_handle(up, channel);
+                        if (r3 & CHBTxIP)
+                                sunzilog_transmit_chars(up, channel);
+                }
+                spin_unlock(&up->port.lock);
+
+                if (tty)
+                        tty_flip_buffer_push(tty);
+
+                up = up->next;
+        }
+
+        return IRQ_HANDLED;
+}
+
+/* A convenient way to quickly get R0 status.  The caller must _not_ hold the
+ * port lock, it is acquired here.
+ */
+static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
+{
+        struct zilog_channel __iomem *channel;
+        unsigned char status;
+
+        channel = ZILOG_CHANNEL_FROM_PORT(port);
+        status = readb(&channel->control);
+        ZSDELAY();
+
+        return status;
+}
+
+/* The port lock is not held.  */
+static unsigned int sunzilog_tx_empty(struct uart_port *port)
+{
+        unsigned long flags;
+        unsigned char status;
+        unsigned int ret;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        status = sunzilog_read_channel_status(port);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        if (status & Tx_BUF_EMP)
+                ret = TIOCSER_TEMT;
+        else
+                ret = 0;
+
+        return ret;
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static unsigned int sunzilog_get_mctrl(struct uart_port *port)
+{
+        unsigned char status;
+        unsigned int ret;
+
+        status = sunzilog_read_channel_status(port);
+
+        ret = 0;
+        if (status & DCD)
+                ret |= TIOCM_CAR;
+        if (status & SYNC)
+                ret |= TIOCM_DSR;
+        if (status & CTS)
+                ret |= TIOCM_CTS;
+
+        return ret;
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char set_bits, clear_bits;
+
+        set_bits = clear_bits = 0;
+
+        if (mctrl & TIOCM_RTS)
+                set_bits |= RTS;
+        else
+                clear_bits |= RTS;
+        if (mctrl & TIOCM_DTR)
+                set_bits |= DTR;
+        else
+                clear_bits |= DTR;
+
+        /* NOTE: Not subject to 'transmitter active' rule.  */ 
+        up->curregs[R5] |= set_bits;
+        up->curregs[R5] &= ~clear_bits;
+        write_zsreg(channel, R5, up->curregs[R5]);
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static void sunzilog_stop_tx(struct uart_port *port)
+{
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+
+        up->flags |= SUNZILOG_FLAG_TX_STOPPED;
+}
+
+/* The port lock is held and interrupts are disabled.  */
+static void sunzilog_start_tx(struct uart_port *port)
+{
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char status;
+
+        up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
+        up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
+
+        status = readb(&channel->control);
+        ZSDELAY();
+
+        /* TX busy?  Just wait for the TX done interrupt.  */
+        if (!(status & Tx_BUF_EMP))
+                return;
+
+        /* Send the first character to jump-start the TX done
+         * IRQ sending engine.
+         */
+        if (port->x_char) {
+                writeb(port->x_char, &channel->data);
+                ZSDELAY();
+                ZS_WSYNC(channel);
+
+                port->icount.tx++;
+                port->x_char = 0;
+        } else {
+                struct circ_buf *xmit = &port->state->xmit;
+
+                writeb(xmit->buf[xmit->tail], &channel->data);
+                ZSDELAY();
+                ZS_WSYNC(channel);
+
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+
+                if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                        uart_write_wakeup(&up->port);
+        }
+}
+
+/* The port lock is held.  */
+static void sunzilog_stop_rx(struct uart_port *port)
+{
+        struct uart_sunzilog_port *up = UART_ZILOG(port);
+        struct zilog_channel __iomem *channel;
+
+        if (ZS_IS_CONS(up))
+                return;
+
+        channel = ZILOG_CHANNEL_FROM_PORT(port);
+
+        /* Disable all RX interrupts.  */
+        up->curregs[R1] &= ~RxINT_MASK;
+        sunzilog_maybe_update_regs(up, channel);
+}
+
+/* The port lock is held.  */
+static void sunzilog_enable_ms(struct uart_port *port)
+{
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char new_reg;
+
+        new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
+        if (new_reg != up->curregs[R15]) {
+                up->curregs[R15] = new_reg;
+
+                /* NOTE: Not subject to 'transmitter active' rule.  */ 
+                write_zsreg(channel, R15, up->curregs[R15] & ~WR7pEN);
+        }
+}
+
+/* The port lock is not held.  */
+static void sunzilog_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        unsigned char set_bits, clear_bits, new_reg;
+        unsigned long flags;
+
+        set_bits = clear_bits = 0;
+
+        if (break_state)
+                set_bits |= SND_BRK;
+        else
+                clear_bits |= SND_BRK;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
+        if (new_reg != up->curregs[R5]) {
+                up->curregs[R5] = new_reg;
+
+                /* NOTE: Not subject to 'transmitter active' rule.  */ 
+                write_zsreg(channel, R5, up->curregs[R5]);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void __sunzilog_startup(struct uart_sunzilog_port *up)
+{
+        struct zilog_channel __iomem *channel;
+
+        channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+        up->prev_status = readb(&channel->control);
+
+        /* Enable receiver and transmitter.  */
+        up->curregs[R3] |= RxENAB;
+        up->curregs[R5] |= TxENAB;
+
+        up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+        sunzilog_maybe_update_regs(up, channel);
+}
+
+static int sunzilog_startup(struct uart_port *port)
+{
+        struct uart_sunzilog_port *up = UART_ZILOG(port);
+        unsigned long flags;
+
+        if (ZS_IS_CONS(up))
+                return 0;
+
+        spin_lock_irqsave(&port->lock, flags);
+        __sunzilog_startup(up);
+        spin_unlock_irqrestore(&port->lock, flags);
+        return 0;
+}
+
+/*
+ * The test for ZS_IS_CONS is explained by the following e-mail:
+ *****
+ * From: Russell King <rmk@arm.linux.org.uk>
+ * Date: Sun, 8 Dec 2002 10:18:38 +0000
+ *
+ * On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
+ * > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
+ * > and I noticed that something is not right with reference
+ * > counting in this case. It seems that when the console
+ * > is open by kernel initially, this is not accounted
+ * > as an open, and uart_startup is not called.
+ *
+ * That is correct.  We are unable to call uart_startup when the serial
+ * console is initialised because it may need to allocate memory (as
+ * request_irq does) and the memory allocators may not have been
+ * initialised.
+ *
+ * 1. initialise the port into a state where it can send characters in the
+ *    console write method.
+ *
+ * 2. don't do the actual hardware shutdown in your shutdown() method (but
+ *    do the normal software shutdown - ie, free irqs etc)
+ *****
+ */
+static void sunzilog_shutdown(struct uart_port *port)
+{
+        struct uart_sunzilog_port *up = UART_ZILOG(port);
+        struct zilog_channel __iomem *channel;
+        unsigned long flags;
+
+        if (ZS_IS_CONS(up))
+                return;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        channel = ZILOG_CHANNEL_FROM_PORT(port);
+
+        /* Disable receiver and transmitter.  */
+        up->curregs[R3] &= ~RxENAB;
+        up->curregs[R5] &= ~TxENAB;
+
+        /* Disable all interrupts and BRK assertion.  */
+        up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
+        up->curregs[R5] &= ~SND_BRK;
+        sunzilog_maybe_update_regs(up, channel);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/* Shared by TTY driver and serial console setup.  The port lock is held
+ * and local interrupts are disabled.
+ */
+static void
+sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
+                       unsigned int iflag, int brg)
+{
+
+        up->curregs[R10] = NRZ;
+        up->curregs[R11] = TCBR | RCBR;
+
+        /* Program BAUD and clock source. */
+        up->curregs[R4] &= ~XCLK_MASK;
+        up->curregs[R4] |= X16CLK;
+        up->curregs[R12] = brg & 0xff;
+        up->curregs[R13] = (brg >> 8) & 0xff;
+        up->curregs[R14] = BRSRC | BRENAB;
+
+        /* Character size, stop bits, and parity. */
+        up->curregs[R3] &= ~RxN_MASK;
+        up->curregs[R5] &= ~TxN_MASK;
+        switch (cflag & CSIZE) {
+        case CS5:
+                up->curregs[R3] |= Rx5;
+                up->curregs[R5] |= Tx5;
+                up->parity_mask = 0x1f;
+                break;
+        case CS6:
+                up->curregs[R3] |= Rx6;
+                up->curregs[R5] |= Tx6;
+                up->parity_mask = 0x3f;
+                break;
+        case CS7:
+                up->curregs[R3] |= Rx7;
+                up->curregs[R5] |= Tx7;
+                up->parity_mask = 0x7f;
+                break;
+        case CS8:
+        default:
+                up->curregs[R3] |= Rx8;
+                up->curregs[R5] |= Tx8;
+                up->parity_mask = 0xff;
+                break;
+        };
+        up->curregs[R4] &= ~0x0c;
+        if (cflag & CSTOPB)
+                up->curregs[R4] |= SB2;
+        else
+                up->curregs[R4] |= SB1;
+        if (cflag & PARENB)
+                up->curregs[R4] |= PAR_ENAB;
+        else
+                up->curregs[R4] &= ~PAR_ENAB;
+        if (!(cflag & PARODD))
+                up->curregs[R4] |= PAR_EVEN;
+        else
+                up->curregs[R4] &= ~PAR_EVEN;
+
+        up->port.read_status_mask = Rx_OVR;
+        if (iflag & INPCK)
+                up->port.read_status_mask |= CRC_ERR | PAR_ERR;
+        if (iflag & (BRKINT | PARMRK))
+                up->port.read_status_mask |= BRK_ABRT;
+
+        up->port.ignore_status_mask = 0;
+        if (iflag & IGNPAR)
+                up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
+        if (iflag & IGNBRK) {
+                up->port.ignore_status_mask |= BRK_ABRT;
+                if (iflag & IGNPAR)
+                        up->port.ignore_status_mask |= Rx_OVR;
+        }
+
+        if ((cflag & CREAD) == 0)
+                up->port.ignore_status_mask = 0xff;
+}
+
+/* The port lock is not held.  */
+static void
+sunzilog_set_termios(struct uart_port *port, struct ktermios *termios,
+                     struct ktermios *old)
+{
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+        unsigned long flags;
+        int baud, brg;
+
+        baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+
+        sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
+
+        if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+                up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
+        else
+                up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
+
+        up->cflag = termios->c_cflag;
+
+        sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static const char *sunzilog_type(struct uart_port *port)
+{
+        struct uart_sunzilog_port *up = UART_ZILOG(port);
+
+        return (up->flags & SUNZILOG_FLAG_ESCC) ? "zs (ESCC)" : "zs";
+}
+
+/* We do not request/release mappings of the registers here, this
+ * happens at early serial probe time.
+ */
+static void sunzilog_release_port(struct uart_port *port)
+{
+}
+
+static int sunzilog_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+/* These do not need to do anything interesting either.  */
+static void sunzilog_config_port(struct uart_port *port, int flags)
+{
+}
+
+/* We do not support letting the user mess with the divisor, IRQ, etc. */
+static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        return -EINVAL;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int sunzilog_get_poll_char(struct uart_port *port)
+{
+        unsigned char ch, r1;
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+        struct zilog_channel __iomem *channel
+                = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+
+        r1 = read_zsreg(channel, R1);
+        if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+                writeb(ERR_RES, &channel->control);
+                ZSDELAY();
+                ZS_WSYNC(channel);
+        }
+
+        ch = readb(&channel->control);
+        ZSDELAY();
+
+        /* This funny hack depends upon BRK_ABRT not interfering
+         * with the other bits we care about in R1.
+         */
+        if (ch & BRK_ABRT)
+                r1 |= BRK_ABRT;
+
+        if (!(ch & Rx_CH_AV))
+                return NO_POLL_CHAR;
+
+        ch = readb(&channel->data);
+        ZSDELAY();
+
+        ch &= up->parity_mask;
+        return ch;
+}
+
+static void sunzilog_put_poll_char(struct uart_port *port,
+                        unsigned char ch)
+{
+        struct uart_sunzilog_port *up = (struct uart_sunzilog_port *)port;
+
+        sunzilog_putchar(&up->port, ch);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
+static struct uart_ops sunzilog_pops = {
+        .tx_empty       =       sunzilog_tx_empty,
+        .set_mctrl      =       sunzilog_set_mctrl,
+        .get_mctrl      =       sunzilog_get_mctrl,
+        .stop_tx        =       sunzilog_stop_tx,
+        .start_tx       =       sunzilog_start_tx,
+        .stop_rx        =       sunzilog_stop_rx,
+        .enable_ms      =       sunzilog_enable_ms,
+        .break_ctl      =       sunzilog_break_ctl,
+        .startup        =       sunzilog_startup,
+        .shutdown       =       sunzilog_shutdown,
+        .set_termios    =       sunzilog_set_termios,
+        .type           =       sunzilog_type,
+        .release_port   =       sunzilog_release_port,
+        .request_port   =       sunzilog_request_port,
+        .config_port    =       sunzilog_config_port,
+        .verify_port    =       sunzilog_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char  =       sunzilog_get_poll_char,
+        .poll_put_char  =       sunzilog_put_poll_char,
+#endif
+};
+
+static int uart_chip_count;
+static struct uart_sunzilog_port *sunzilog_port_table;
+static struct zilog_layout __iomem **sunzilog_chip_regs;
+
+static struct uart_sunzilog_port *sunzilog_irq_chain;
+
+static struct uart_driver sunzilog_reg = {
+        .owner          =       THIS_MODULE,
+        .driver_name    =       "sunzilog",
+        .dev_name       =       "ttyS",
+        .major          =       TTY_MAJOR,
+};
+
+static int __init sunzilog_alloc_tables(int num_sunzilog)
+{
+        struct uart_sunzilog_port *up;
+        unsigned long size;
+        int num_channels = num_sunzilog * 2;
+        int i;
+
+        size = num_channels * sizeof(struct uart_sunzilog_port);
+        sunzilog_port_table = kzalloc(size, GFP_KERNEL);
+        if (!sunzilog_port_table)
+                return -ENOMEM;
+
+        for (i = 0; i < num_channels; i++) {
+                up = &sunzilog_port_table[i];
+
+                spin_lock_init(&up->port.lock);
+
+                if (i == 0)
+                        sunzilog_irq_chain = up;
+
+                if (i < num_channels - 1)
+                        up->next = up + 1;
+                else
+                        up->next = NULL;
+        }
+
+        size = num_sunzilog * sizeof(struct zilog_layout __iomem *);
+        sunzilog_chip_regs = kzalloc(size, GFP_KERNEL);
+        if (!sunzilog_chip_regs) {
+                kfree(sunzilog_port_table);
+                sunzilog_irq_chain = NULL;
+                return -ENOMEM;
+        }
+
+        return 0;
+}
+
+static void sunzilog_free_tables(void)
+{
+        kfree(sunzilog_port_table);
+        sunzilog_irq_chain = NULL;
+        kfree(sunzilog_chip_regs);
+}
+
+#define ZS_PUT_CHAR_MAX_DELAY   2000    /* 10 ms */
+
+static void sunzilog_putchar(struct uart_port *port, int ch)
+{
+        struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
+        int loops = ZS_PUT_CHAR_MAX_DELAY;
+
+        /* This is a timed polling loop so do not switch the explicit
+         * udelay with ZSDELAY as that is a NOP on some platforms.  -DaveM
+         */
+        do {
+                unsigned char val = readb(&channel->control);
+                if (val & Tx_BUF_EMP) {
+                        ZSDELAY();
+                        break;
+                }
+                udelay(5);
+        } while (--loops);
+
+        writeb(ch, &channel->data);
+        ZSDELAY();
+        ZS_WSYNC(channel);
+}
+
+#ifdef CONFIG_SERIO
+
+static DEFINE_SPINLOCK(sunzilog_serio_lock);
+
+static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
+{
+        struct uart_sunzilog_port *up = serio->port_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sunzilog_serio_lock, flags);
+
+        sunzilog_putchar(&up->port, ch);
+
+        spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
+
+        return 0;
+}
+
+static int sunzilog_serio_open(struct serio *serio)
+{
+        struct uart_sunzilog_port *up = serio->port_data;
+        unsigned long flags;
+        int ret;
+
+        spin_lock_irqsave(&sunzilog_serio_lock, flags);
+        if (!up->serio_open) {
+                up->serio_open = 1;
+                ret = 0;
+        } else
+                ret = -EBUSY;
+        spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
+
+        return ret;
+}
+
+static void sunzilog_serio_close(struct serio *serio)
+{
+        struct uart_sunzilog_port *up = serio->port_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sunzilog_serio_lock, flags);
+        up->serio_open = 0;
+        spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
+}
+
+#endif /* CONFIG_SERIO */
+
+#ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
+static void
+sunzilog_console_write(struct console *con, const char *s, unsigned int count)
+{
+        struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
+        unsigned long flags;
+        int locked = 1;
+
+        local_irq_save(flags);
+        if (up->port.sysrq) {
+                locked = 0;
+        } else if (oops_in_progress) {
+                locked = spin_trylock(&up->port.lock);
+        } else
+                spin_lock(&up->port.lock);
+
+        uart_console_write(&up->port, s, count, sunzilog_putchar);
+        udelay(2);
+
+        if (locked)
+                spin_unlock(&up->port.lock);
+        local_irq_restore(flags);
+}
+
+static int __init sunzilog_console_setup(struct console *con, char *options)
+{
+        struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
+        unsigned long flags;
+        int baud, brg;
+
+        if (up->port.type != PORT_SUNZILOG)
+                return -1;
+
+        printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
+               (sunzilog_reg.minor - 64) + con->index, con->index);
+
+        /* Get firmware console settings.  */
+        sunserial_console_termios(con, up->port.dev->of_node);
+
+        /* Firmware console speed is limited to 150-->38400 baud so
+         * this hackish cflag thing is OK.
+         */
+        switch (con->cflag & CBAUD) {
+        case B150: baud = 150; break;
+        case B300: baud = 300; break;
+        case B600: baud = 600; break;
+        case B1200: baud = 1200; break;
+        case B2400: baud = 2400; break;
+        case B4800: baud = 4800; break;
+        default: case B9600: baud = 9600; break;
+        case B19200: baud = 19200; break;
+        case B38400: baud = 38400; break;
+        };
+
+        brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+
+        up->curregs[R15] |= BRKIE;
+        sunzilog_convert_to_zs(up, con->cflag, 0, brg);
+
+        sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
+        __sunzilog_startup(up);
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+        return 0;
+}
+
+static struct console sunzilog_console_ops = {
+        .name   =       "ttyS",
+        .write  =       sunzilog_console_write,
+        .device =       uart_console_device,
+        .setup  =       sunzilog_console_setup,
+        .flags  =       CON_PRINTBUFFER,
+        .index  =       -1,
+        .data   =       &sunzilog_reg,
+};
+
+static inline struct console *SUNZILOG_CONSOLE(void)
+{
+        return &sunzilog_console_ops;
+}
+
+#else
+#define SUNZILOG_CONSOLE()      (NULL)
+#endif
+
+static void __devinit sunzilog_init_kbdms(struct uart_sunzilog_port *up)
+{
+        int baud, brg;
+
+        if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
+                up->cflag = B1200 | CS8 | CLOCAL | CREAD;
+                baud = 1200;
+        } else {
+                up->cflag = B4800 | CS8 | CLOCAL | CREAD;
+                baud = 4800;
+        }
+
+        up->curregs[R15] |= BRKIE;
+        brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+        sunzilog_convert_to_zs(up, up->cflag, 0, brg);
+        sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
+        __sunzilog_startup(up);
+}
+
+#ifdef CONFIG_SERIO
+static void __devinit sunzilog_register_serio(struct uart_sunzilog_port *up)
+{
+        struct serio *serio = &up->serio;
+
+        serio->port_data = up;
+
+        serio->id.type = SERIO_RS232;
+        if (up->flags & SUNZILOG_FLAG_CONS_KEYB) {
+                serio->id.proto = SERIO_SUNKBD;
+                strlcpy(serio->name, "zskbd", sizeof(serio->name));
+        } else {
+                serio->id.proto = SERIO_SUN;
+                serio->id.extra = 1;
+                strlcpy(serio->name, "zsms", sizeof(serio->name));
+        }
+        strlcpy(serio->phys,
+                ((up->flags & SUNZILOG_FLAG_CONS_KEYB) ?
+                 "zs/serio0" : "zs/serio1"),
+                sizeof(serio->phys));
+
+        serio->write = sunzilog_serio_write;
+        serio->open = sunzilog_serio_open;
+        serio->close = sunzilog_serio_close;
+        serio->dev.parent = up->port.dev;
+
+        serio_register_port(serio);
+}
+#endif
+
+static void __devinit sunzilog_init_hw(struct uart_sunzilog_port *up)
+{
+        struct zilog_channel __iomem *channel;
+        unsigned long flags;
+        int baud, brg;
+
+        channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+        spin_lock_irqsave(&up->port.lock, flags);
+        if (ZS_IS_CHANNEL_A(up)) {
+                write_zsreg(channel, R9, FHWRES);
+                ZSDELAY_LONG();
+                (void) read_zsreg(channel, R0);
+        }
+
+        if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
+                         SUNZILOG_FLAG_CONS_MOUSE)) {
+                up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+                up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
+                up->curregs[R3] = RxENAB | Rx8;
+                up->curregs[R5] = TxENAB | Tx8;
+                up->curregs[R6] = 0x00; /* SDLC Address */
+                up->curregs[R7] = 0x7E; /* SDLC Flag    */
+                up->curregs[R9] = NV;
+                up->curregs[R7p] = 0x00;
+                sunzilog_init_kbdms(up);
+                /* Only enable interrupts if an ISR handler available */
+                if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
+                        up->curregs[R9] |= MIE;
+                write_zsreg(channel, R9, up->curregs[R9]);
+        } else {
+                /* Normal serial TTY. */
+                up->parity_mask = 0xff;
+                up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
+                up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
+                up->curregs[R3] = RxENAB | Rx8;
+                up->curregs[R5] = TxENAB | Tx8;
+                up->curregs[R6] = 0x00; /* SDLC Address */
+                up->curregs[R7] = 0x7E; /* SDLC Flag    */
+                up->curregs[R9] = NV;
+                up->curregs[R10] = NRZ;
+                up->curregs[R11] = TCBR | RCBR;
+                baud = 9600;
+                brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
+                up->curregs[R12] = (brg & 0xff);
+                up->curregs[R13] = (brg >> 8) & 0xff;
+                up->curregs[R14] = BRSRC | BRENAB;
+                up->curregs[R15] = FIFOEN; /* Use FIFO if on ESCC */
+                up->curregs[R7p] = TxFIFO_LVL | RxFIFO_LVL;
+                if (__load_zsregs(channel, up->curregs)) {
+                        up->flags |= SUNZILOG_FLAG_ESCC;
+                }
+                /* Only enable interrupts if an ISR handler available */
+                if (up->flags & SUNZILOG_FLAG_ISR_HANDLER)
+                        up->curregs[R9] |= MIE;
+                write_zsreg(channel, R9, up->curregs[R9]);
+        }
+
+        spin_unlock_irqrestore(&up->port.lock, flags);
+
+#ifdef CONFIG_SERIO
+        if (up->flags & (SUNZILOG_FLAG_CONS_KEYB |
+                         SUNZILOG_FLAG_CONS_MOUSE))
+                sunzilog_register_serio(up);
+#endif
+}
+
+static int zilog_irq = -1;
+
+static int __devinit zs_probe(struct platform_device *op)
+{
+        static int kbm_inst, uart_inst;
+        int inst;
+        struct uart_sunzilog_port *up;
+        struct zilog_layout __iomem *rp;
+        int keyboard_mouse = 0;
+        int err;
+
+        if (of_find_property(op->dev.of_node, "keyboard", NULL))
+                keyboard_mouse = 1;
+
+        /* uarts must come before keyboards/mice */
+        if (keyboard_mouse)
+                inst = uart_chip_count + kbm_inst;
+        else
+                inst = uart_inst;
+
+        sunzilog_chip_regs[inst] = of_ioremap(&op->resource[0], 0,
+                                              sizeof(struct zilog_layout),
+                                              "zs");
+        if (!sunzilog_chip_regs[inst])
+                return -ENOMEM;
+
+        rp = sunzilog_chip_regs[inst];
+
+        if (zilog_irq == -1)
+                zilog_irq = op->archdata.irqs[0];
+
+        up = &sunzilog_port_table[inst * 2];
+
+        /* Channel A */
+        up[0].port.mapbase = op->resource[0].start + 0x00;
+        up[0].port.membase = (void __iomem *) &rp->channelA;
+        up[0].port.iotype = UPIO_MEM;
+        up[0].port.irq = op->archdata.irqs[0];
+        up[0].port.uartclk = ZS_CLOCK;
+        up[0].port.fifosize = 1;
+        up[0].port.ops = &sunzilog_pops;
+        up[0].port.type = PORT_SUNZILOG;
+        up[0].port.flags = 0;
+        up[0].port.line = (inst * 2) + 0;
+        up[0].port.dev = &op->dev;
+        up[0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
+        if (keyboard_mouse)
+                up[0].flags |= SUNZILOG_FLAG_CONS_KEYB;
+        sunzilog_init_hw(&up[0]);
+
+        /* Channel B */
+        up[1].port.mapbase = op->resource[0].start + 0x04;
+        up[1].port.membase = (void __iomem *) &rp->channelB;
+        up[1].port.iotype = UPIO_MEM;
+        up[1].port.irq = op->archdata.irqs[0];
+        up[1].port.uartclk = ZS_CLOCK;
+        up[1].port.fifosize = 1;
+        up[1].port.ops = &sunzilog_pops;
+        up[1].port.type = PORT_SUNZILOG;
+        up[1].port.flags = 0;
+        up[1].port.line = (inst * 2) + 1;
+        up[1].port.dev = &op->dev;
+        up[1].flags |= 0;
+        if (keyboard_mouse)
+                up[1].flags |= SUNZILOG_FLAG_CONS_MOUSE;
+        sunzilog_init_hw(&up[1]);
+
+        if (!keyboard_mouse) {
+                if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
+                                            &sunzilog_reg, up[0].port.line,
+                                            false))
+                        up->flags |= SUNZILOG_FLAG_IS_CONS;
+                err = uart_add_one_port(&sunzilog_reg, &up[0].port);
+                if (err) {
+                        of_iounmap(&op->resource[0],
+                                   rp, sizeof(struct zilog_layout));
+                        return err;
+                }
+                if (sunserial_console_match(SUNZILOG_CONSOLE(), op->dev.of_node,
+                                            &sunzilog_reg, up[1].port.line,
+                                            false))
+                        up->flags |= SUNZILOG_FLAG_IS_CONS;
+                err = uart_add_one_port(&sunzilog_reg, &up[1].port);
+                if (err) {
+                        uart_remove_one_port(&sunzilog_reg, &up[0].port);
+                        of_iounmap(&op->resource[0],
+                                   rp, sizeof(struct zilog_layout));
+                        return err;
+                }
+                uart_inst++;
+        } else {
+                printk(KERN_INFO "%s: Keyboard at MMIO 0x%llx (irq = %d) "
+                       "is a %s\n",
+                       dev_name(&op->dev),
+                       (unsigned long long) up[0].port.mapbase,
+                       op->archdata.irqs[0], sunzilog_type(&up[0].port));
+                printk(KERN_INFO "%s: Mouse at MMIO 0x%llx (irq = %d) "
+                       "is a %s\n",
+                       dev_name(&op->dev),
+                       (unsigned long long) up[1].port.mapbase,
+                       op->archdata.irqs[0], sunzilog_type(&up[1].port));
+                kbm_inst++;
+        }
+
+        dev_set_drvdata(&op->dev, &up[0]);
+
+        return 0;
+}
+
+static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
+{
+        if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
+#ifdef CONFIG_SERIO
+                serio_unregister_port(&up->serio);
+#endif
+        } else
+                uart_remove_one_port(&sunzilog_reg, &up->port);
+}
+
+static int __devexit zs_remove(struct platform_device *op)
+{
+        struct uart_sunzilog_port *up = dev_get_drvdata(&op->dev);
+        struct zilog_layout __iomem *regs;
+
+        zs_remove_one(&up[0]);
+        zs_remove_one(&up[1]);
+
+        regs = sunzilog_chip_regs[up[0].port.line / 2];
+        of_iounmap(&op->resource[0], regs, sizeof(struct zilog_layout));
+
+        dev_set_drvdata(&op->dev, NULL);
+
+        return 0;
+}
+
+static const struct of_device_id zs_match[] = {
+        {
+                .name = "zs",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, zs_match);
+
+static struct platform_driver zs_driver = {
+        .driver = {
+                .name = "zs",
+                .owner = THIS_MODULE,
+                .of_match_table = zs_match,
+        },
+        .probe          = zs_probe,
+        .remove         = __devexit_p(zs_remove),
+};
+
+static int __init sunzilog_init(void)
+{
+        struct device_node *dp;
+        int err;
+        int num_keybms = 0;
+        int num_sunzilog = 0;
+
+        for_each_node_by_name(dp, "zs") {
+                num_sunzilog++;
+                if (of_find_property(dp, "keyboard", NULL))
+                        num_keybms++;
+        }
+
+        if (num_sunzilog) {
+                err = sunzilog_alloc_tables(num_sunzilog);
+                if (err)
+                        goto out;
+
+                uart_chip_count = num_sunzilog - num_keybms;
+
+                err = sunserial_register_minors(&sunzilog_reg,
+                                                uart_chip_count * 2);
+                if (err)
+                        goto out_free_tables;
+        }
+
+        err = platform_driver_register(&zs_driver);
+        if (err)
+                goto out_unregister_uart;
+
+        if (zilog_irq != -1) {
+                struct uart_sunzilog_port *up = sunzilog_irq_chain;
+                err = request_irq(zilog_irq, sunzilog_interrupt, IRQF_SHARED,
+                                  "zs", sunzilog_irq_chain);
+                if (err)
+                        goto out_unregister_driver;
+
+                /* Enable Interrupts */
+                while (up) {
+                        struct zilog_channel __iomem *channel;
+
+                        /* printk (KERN_INFO "Enable IRQ for ZILOG Hardware %p\n", up); */
+                        channel          = ZILOG_CHANNEL_FROM_PORT(&up->port);
+                        up->flags       |= SUNZILOG_FLAG_ISR_HANDLER;
+                        up->curregs[R9] |= MIE;
+                        write_zsreg(channel, R9, up->curregs[R9]);
+                        up = up->next;
+                }
+        }
+
+out:
+        return err;
+
+out_unregister_driver:
+        platform_driver_unregister(&zs_driver);
+
+out_unregister_uart:
+        if (num_sunzilog) {
+                sunserial_unregister_minors(&sunzilog_reg, num_sunzilog);
+                sunzilog_reg.cons = NULL;
+        }
+
+out_free_tables:
+        sunzilog_free_tables();
+        goto out;
+}
+
+static void __exit sunzilog_exit(void)
+{
+        platform_driver_unregister(&zs_driver);
+
+        if (zilog_irq != -1) {
+                struct uart_sunzilog_port *up = sunzilog_irq_chain;
+
+                /* Disable Interrupts */
+                while (up) {
+                        struct zilog_channel __iomem *channel;
+
+                        /* printk (KERN_INFO "Disable IRQ for ZILOG Hardware %p\n", up); */
+                        channel          = ZILOG_CHANNEL_FROM_PORT(&up->port);
+                        up->flags       &= ~SUNZILOG_FLAG_ISR_HANDLER;
+                        up->curregs[R9] &= ~MIE;
+                        write_zsreg(channel, R9, up->curregs[R9]);
+                        up = up->next;
+                }
+
+                free_irq(zilog_irq, sunzilog_irq_chain);
+                zilog_irq = -1;
+        }
+
+        if (sunzilog_reg.nr) {
+                sunserial_unregister_minors(&sunzilog_reg, sunzilog_reg.nr);
+                sunzilog_free_tables();
+        }
+}
+
+module_init(sunzilog_init);
+module_exit(sunzilog_exit);
+
+MODULE_AUTHOR("David S. Miller");
+MODULE_DESCRIPTION("Sun Zilog serial port driver");
+MODULE_VERSION("2.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/sunzilog.h b/drivers/tty/serial/sunzilog.h
new file mode 100644
index 000000000000..5dec7b47cc38
--- /dev/null
+++ b/drivers/tty/serial/sunzilog.h
@@ -0,0 +1,289 @@
+#ifndef _SUNZILOG_H
+#define _SUNZILOG_H
+
+struct zilog_channel {
+        volatile unsigned char control;
+        volatile unsigned char __pad1;
+        volatile unsigned char data;
+        volatile unsigned char __pad2;
+};
+
+struct zilog_layout {
+        struct zilog_channel channelB;
+        struct zilog_channel channelA;
+};
+
+#define NUM_ZSREGS      17
+#define R7p             16 /* Written as R7 with P15 bit 0 set */
+
+/* Conversion routines to/from brg time constants from/to bits
+ * per second.
+ */
+#define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
+#define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
+
+/* The Zilog register set */
+
+#define FLAG    0x7e
+
+/* Write Register 0 */
+#define R0      0               /* Register selects */
+#define R1      1
+#define R2      2
+#define R3      3
+#define R4      4
+#define R5      5
+#define R6      6
+#define R7      7
+#define R8      8
+#define R9      9
+#define R10     10
+#define R11     11
+#define R12     12
+#define R13     13
+#define R14     14
+#define R15     15
+
+#define NULLCODE        0       /* Null Code */
+#define POINT_HIGH      0x8     /* Select upper half of registers */
+#define RES_EXT_INT     0x10    /* Reset Ext. Status Interrupts */
+#define SEND_ABORT      0x18    /* HDLC Abort */
+#define RES_RxINT_FC    0x20    /* Reset RxINT on First Character */
+#define RES_Tx_P        0x28    /* Reset TxINT Pending */
+#define ERR_RES         0x30    /* Error Reset */
+#define RES_H_IUS       0x38    /* Reset highest IUS */
+
+#define RES_Rx_CRC      0x40    /* Reset Rx CRC Checker */
+#define RES_Tx_CRC      0x80    /* Reset Tx CRC Checker */
+#define RES_EOM_L       0xC0    /* Reset EOM latch */
+
+/* Write Register 1 */
+
+#define EXT_INT_ENAB    0x1     /* Ext Int Enable */
+#define TxINT_ENAB      0x2     /* Tx Int Enable */
+#define PAR_SPEC        0x4     /* Parity is special condition */
+
+#define RxINT_DISAB     0       /* Rx Int Disable */
+#define RxINT_FCERR     0x8     /* Rx Int on First Character Only or Error */
+#define INT_ALL_Rx      0x10    /* Int on all Rx Characters or error */
+#define INT_ERR_Rx      0x18    /* Int on error only */
+#define RxINT_MASK      0x18
+
+#define WT_RDY_RT       0x20    /* Wait/Ready on R/T */
+#define WT_FN_RDYFN     0x40    /* Wait/FN/Ready FN */
+#define WT_RDY_ENAB     0x80    /* Wait/Ready Enable */
+
+/* Write Register #2 (Interrupt Vector) */
+
+/* Write Register 3 */
+
+#define RxENAB          0x1     /* Rx Enable */
+#define SYNC_L_INH      0x2     /* Sync Character Load Inhibit */
+#define ADD_SM          0x4     /* Address Search Mode (SDLC) */
+#define RxCRC_ENAB      0x8     /* Rx CRC Enable */
+#define ENT_HM          0x10    /* Enter Hunt Mode */
+#define AUTO_ENAB       0x20    /* Auto Enables */
+#define Rx5             0x0     /* Rx 5 Bits/Character */
+#define Rx7             0x40    /* Rx 7 Bits/Character */
+#define Rx6             0x80    /* Rx 6 Bits/Character */
+#define Rx8             0xc0    /* Rx 8 Bits/Character */
+#define RxN_MASK        0xc0
+
+/* Write Register 4 */
+
+#define PAR_ENAB        0x1     /* Parity Enable */
+#define PAR_EVEN        0x2     /* Parity Even/Odd* */
+
+#define SYNC_ENAB       0       /* Sync Modes Enable */
+#define SB1             0x4     /* 1 stop bit/char */
+#define SB15            0x8     /* 1.5 stop bits/char */
+#define SB2             0xc     /* 2 stop bits/char */
+
+#define MONSYNC         0       /* 8 Bit Sync character */
+#define BISYNC          0x10    /* 16 bit sync character */
+#define SDLC            0x20    /* SDLC Mode (01111110 Sync Flag) */
+#define EXTSYNC         0x30    /* External Sync Mode */
+
+#define X1CLK           0x0     /* x1 clock mode */
+#define X16CLK          0x40    /* x16 clock mode */
+#define X32CLK          0x80    /* x32 clock mode */
+#define X64CLK          0xC0    /* x64 clock mode */
+#define XCLK_MASK       0xC0
+
+/* Write Register 5 */
+
+#define TxCRC_ENAB      0x1     /* Tx CRC Enable */
+#define RTS             0x2     /* RTS */
+#define SDLC_CRC        0x4     /* SDLC/CRC-16 */
+#define TxENAB          0x8     /* Tx Enable */
+#define SND_BRK         0x10    /* Send Break */
+#define Tx5             0x0     /* Tx 5 bits (or less)/character */
+#define Tx7             0x20    /* Tx 7 bits/character */
+#define Tx6             0x40    /* Tx 6 bits/character */
+#define Tx8             0x60    /* Tx 8 bits/character */
+#define TxN_MASK        0x60
+#define DTR             0x80    /* DTR */
+
+/* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
+
+/* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
+
+/* Write Register 7' (ESCC Only) */
+#define AUTO_TxFLAG     1       /* Automatic Tx SDLC Flag */
+#define AUTO_EOM_RST    2       /* Automatic EOM Reset */
+#define AUTOnRTS        4       /* Automatic /RTS pin deactivation */
+#define RxFIFO_LVL      8       /* Receive FIFO interrupt level */
+#define nDTRnREQ        0x10    /* /DTR/REQ timing */
+#define TxFIFO_LVL      0x20    /* Transmit FIFO interrupt level */
+#define EXT_RD_EN       0x40    /* Extended read register enable */
+
+/* Write Register 8 (transmit buffer) */
+
+/* Write Register 9 (Master interrupt control) */
+#define VIS     1       /* Vector Includes Status */
+#define NV      2       /* No Vector */
+#define DLC     4       /* Disable Lower Chain */
+#define MIE     8       /* Master Interrupt Enable */
+#define STATHI  0x10    /* Status high */
+#define SWIACK  0x20    /* Software Interrupt Ack (not on NMOS) */
+#define NORESET 0       /* No reset on write to R9 */
+#define CHRB    0x40    /* Reset channel B */
+#define CHRA    0x80    /* Reset channel A */
+#define FHWRES  0xc0    /* Force hardware reset */
+
+/* Write Register 10 (misc control bits) */
+#define BIT6    1       /* 6 bit/8bit sync */
+#define LOOPMODE 2      /* SDLC Loop mode */
+#define ABUNDER 4       /* Abort/flag on SDLC xmit underrun */
+#define MARKIDLE 8      /* Mark/flag on idle */
+#define GAOP    0x10    /* Go active on poll */
+#define NRZ     0       /* NRZ mode */
+#define NRZI    0x20    /* NRZI mode */
+#define FM1     0x40    /* FM1 (transition = 1) */
+#define FM0     0x60    /* FM0 (transition = 0) */
+#define CRCPS   0x80    /* CRC Preset I/O */
+
+/* Write Register 11 (Clock Mode control) */
+#define TRxCXT  0       /* TRxC = Xtal output */
+#define TRxCTC  1       /* TRxC = Transmit clock */
+#define TRxCBR  2       /* TRxC = BR Generator Output */
+#define TRxCDP  3       /* TRxC = DPLL output */
+#define TRxCOI  4       /* TRxC O/I */
+#define TCRTxCP 0       /* Transmit clock = RTxC pin */
+#define TCTRxCP 8       /* Transmit clock = TRxC pin */
+#define TCBR    0x10    /* Transmit clock = BR Generator output */
+#define TCDPLL  0x18    /* Transmit clock = DPLL output */
+#define RCRTxCP 0       /* Receive clock = RTxC pin */
+#define RCTRxCP 0x20    /* Receive clock = TRxC pin */
+#define RCBR    0x40    /* Receive clock = BR Generator output */
+#define RCDPLL  0x60    /* Receive clock = DPLL output */
+#define RTxCX   0x80    /* RTxC Xtal/No Xtal */
+
+/* Write Register 12 (lower byte of baud rate generator time constant) */
+
+/* Write Register 13 (upper byte of baud rate generator time constant) */
+
+/* Write Register 14 (Misc control bits) */
+#define BRENAB  1       /* Baud rate generator enable */
+#define BRSRC   2       /* Baud rate generator source */
+#define DTRREQ  4       /* DTR/Request function */
+#define AUTOECHO 8      /* Auto Echo */
+#define LOOPBAK 0x10    /* Local loopback */
+#define SEARCH  0x20    /* Enter search mode */
+#define RMC     0x40    /* Reset missing clock */
+#define DISDPLL 0x60    /* Disable DPLL */
+#define SSBR    0x80    /* Set DPLL source = BR generator */
+#define SSRTxC  0xa0    /* Set DPLL source = RTxC */
+#define SFMM    0xc0    /* Set FM mode */
+#define SNRZI   0xe0    /* Set NRZI mode */
+
+/* Write Register 15 (external/status interrupt control) */
+#define WR7pEN  1       /* WR7' Enable (ESCC only) */
+#define ZCIE    2       /* Zero count IE */
+#define FIFOEN  4       /* FIFO Enable (ESCC only) */
+#define DCDIE   8       /* DCD IE */
+#define SYNCIE  0x10    /* Sync/hunt IE */
+#define CTSIE   0x20    /* CTS IE */
+#define TxUIE   0x40    /* Tx Underrun/EOM IE */
+#define BRKIE   0x80    /* Break/Abort IE */
+
+
+/* Read Register 0 */
+#define Rx_CH_AV        0x1     /* Rx Character Available */
+#define ZCOUNT          0x2     /* Zero count */
+#define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
+#define DCD             0x8     /* DCD */
+#define SYNC            0x10    /* Sync/hunt */
+#define CTS             0x20    /* CTS */
+#define TxEOM           0x40    /* Tx underrun */
+#define BRK_ABRT        0x80    /* Break/Abort */
+
+/* Read Register 1 */
+#define ALL_SNT         0x1     /* All sent */
+/* Residue Data for 8 Rx bits/char programmed */
+#define RES3            0x8     /* 0/3 */
+#define RES4            0x4     /* 0/4 */
+#define RES5            0xc     /* 0/5 */
+#define RES6            0x2     /* 0/6 */
+#define RES7            0xa     /* 0/7 */
+#define RES8            0x6     /* 0/8 */
+#define RES18           0xe     /* 1/8 */
+#define RES28           0x0     /* 2/8 */
+/* Special Rx Condition Interrupts */
+#define PAR_ERR         0x10    /* Parity error */
+#define Rx_OVR          0x20    /* Rx Overrun Error */
+#define CRC_ERR         0x40    /* CRC/Framing Error */
+#define END_FR          0x80    /* End of Frame (SDLC) */
+
+/* Read Register 2 (channel b only) - Interrupt vector */
+#define CHB_Tx_EMPTY    0x00
+#define CHB_EXT_STAT    0x02
+#define CHB_Rx_AVAIL    0x04
+#define CHB_SPECIAL     0x06
+#define CHA_Tx_EMPTY    0x08
+#define CHA_EXT_STAT    0x0a
+#define CHA_Rx_AVAIL    0x0c
+#define CHA_SPECIAL     0x0e
+#define STATUS_MASK     0x0e
+
+/* Read Register 3 (interrupt pending register) ch a only */
+#define CHBEXT  0x1             /* Channel B Ext/Stat IP */
+#define CHBTxIP 0x2             /* Channel B Tx IP */
+#define CHBRxIP 0x4             /* Channel B Rx IP */
+#define CHAEXT  0x8             /* Channel A Ext/Stat IP */
+#define CHATxIP 0x10            /* Channel A Tx IP */
+#define CHARxIP 0x20            /* Channel A Rx IP */
+
+/* Read Register 6 (LSB frame byte count [Not on NMOS]) */
+
+/* Read Register 7 (MSB frame byte count and FIFO status [Not on NMOS]) */
+
+/* Read Register 8 (receive data register) */
+
+/* Read Register 10  (misc status bits) */
+#define ONLOOP  2               /* On loop */
+#define LOOPSEND 0x10           /* Loop sending */
+#define CLK2MIS 0x40            /* Two clocks missing */
+#define CLK1MIS 0x80            /* One clock missing */
+
+/* Read Register 12 (lower byte of baud rate generator constant) */
+
+/* Read Register 13 (upper byte of baud rate generator constant) */
+
+/* Read Register 15 (value of WR 15) */
+
+/* Misc macros */
+#define ZS_CLEARERR(channel)    do { sbus_writeb(ERR_RES, &channel->control); \
+                                     udelay(5); } while(0)
+
+#define ZS_CLEARSTAT(channel)   do { sbus_writeb(RES_EXT_INT, &channel->control); \
+                                     udelay(5); } while(0)
+
+#define ZS_CLEARFIFO(channel)   do { sbus_readb(&channel->data); \
+                                     udelay(2); \
+                                     sbus_readb(&channel->data); \
+                                     udelay(2); \
+                                     sbus_readb(&channel->data); \
+                                     udelay(2); } while(0)
+
+#endif /* _SUNZILOG_H */
diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
new file mode 100644
index 000000000000..1f36b7eb7351
--- /dev/null
+++ b/drivers/tty/serial/timbuart.c
@@ -0,0 +1,531 @@
+/*
+ * timbuart.c timberdale FPGA UART driver
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * Timberdale FPGA UART
+ */
+
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/serial_core.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+
+#include "timbuart.h"
+
+struct timbuart_port {
+        struct uart_port        port;
+        struct tasklet_struct   tasklet;
+        int                     usedma;
+        u32                     last_ier;
+        struct platform_device  *dev;
+};
+
+static int baudrates[] = {9600, 19200, 38400, 57600, 115200, 230400, 460800,
+        921600, 1843200, 3250000};
+
+static void timbuart_mctrl_check(struct uart_port *port, u32 isr, u32 *ier);
+
+static irqreturn_t timbuart_handleinterrupt(int irq, void *devid);
+
+static void timbuart_stop_rx(struct uart_port *port)
+{
+        /* spin lock held by upper layer, disable all RX interrupts */
+        u32 ier = ioread32(port->membase + TIMBUART_IER) & ~RXFLAGS;
+        iowrite32(ier, port->membase + TIMBUART_IER);
+}
+
+static void timbuart_stop_tx(struct uart_port *port)
+{
+        /* spinlock held by upper layer, disable TX interrupt */
+        u32 ier = ioread32(port->membase + TIMBUART_IER) & ~TXBAE;
+        iowrite32(ier, port->membase + TIMBUART_IER);
+}
+
+static void timbuart_start_tx(struct uart_port *port)
+{
+        struct timbuart_port *uart =
+                container_of(port, struct timbuart_port, port);
+
+        /* do not transfer anything here -> fire off the tasklet */
+        tasklet_schedule(&uart->tasklet);
+}
+
+static unsigned int timbuart_tx_empty(struct uart_port *port)
+{
+        u32 isr = ioread32(port->membase + TIMBUART_ISR);
+
+        return (isr & TXBE) ? TIOCSER_TEMT : 0;
+}
+
+static void timbuart_flush_buffer(struct uart_port *port)
+{
+        if (!timbuart_tx_empty(port)) {
+                u8 ctl = ioread8(port->membase + TIMBUART_CTRL) |
+                        TIMBUART_CTRL_FLSHTX;
+
+                iowrite8(ctl, port->membase + TIMBUART_CTRL);
+                iowrite32(TXBF, port->membase + TIMBUART_ISR);
+        }
+}
+
+static void timbuart_rx_chars(struct uart_port *port)
+{
+        struct tty_struct *tty = port->state->port.tty;
+
+        while (ioread32(port->membase + TIMBUART_ISR) & RXDP) {
+                u8 ch = ioread8(port->membase + TIMBUART_RXFIFO);
+                port->icount.rx++;
+                tty_insert_flip_char(tty, ch, TTY_NORMAL);
+        }
+
+        spin_unlock(&port->lock);
+        tty_flip_buffer_push(port->state->port.tty);
+        spin_lock(&port->lock);
+
+        dev_dbg(port->dev, "%s - total read %d bytes\n",
+                __func__, port->icount.rx);
+}
+
+static void timbuart_tx_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+
+        while (!(ioread32(port->membase + TIMBUART_ISR) & TXBF) &&
+                !uart_circ_empty(xmit)) {
+                iowrite8(xmit->buf[xmit->tail],
+                        port->membase + TIMBUART_TXFIFO);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+
+        dev_dbg(port->dev,
+                "%s - total written %d bytes, CTL: %x, RTS: %x, baud: %x\n",
+                 __func__,
+                port->icount.tx,
+                ioread8(port->membase + TIMBUART_CTRL),
+                port->mctrl & TIOCM_RTS,
+                ioread8(port->membase + TIMBUART_BAUDRATE));
+}
+
+static void timbuart_handle_tx_port(struct uart_port *port, u32 isr, u32 *ier)
+{
+        struct timbuart_port *uart =
+                container_of(port, struct timbuart_port, port);
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+                return;
+
+        if (port->x_char)
+                return;
+
+        if (isr & TXFLAGS) {
+                timbuart_tx_chars(port);
+                /* clear all TX interrupts */
+                iowrite32(TXFLAGS, port->membase + TIMBUART_ISR);
+
+                if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                        uart_write_wakeup(port);
+        } else
+                /* Re-enable any tx interrupt */
+                *ier |= uart->last_ier & TXFLAGS;
+
+        /* enable interrupts if there are chars in the transmit buffer,
+         * Or if we delivered some bytes and want the almost empty interrupt
+         * we wake up the upper layer later when we got the interrupt
+         * to give it some time to go out...
+         */
+        if (!uart_circ_empty(xmit))
+                *ier |= TXBAE;
+
+        dev_dbg(port->dev, "%s - leaving\n", __func__);
+}
+
+void timbuart_handle_rx_port(struct uart_port *port, u32 isr, u32 *ier)
+{
+        if (isr & RXFLAGS) {
+                /* Some RX status is set */
+                if (isr & RXBF) {
+                        u8 ctl = ioread8(port->membase + TIMBUART_CTRL) |
+                                TIMBUART_CTRL_FLSHRX;
+                        iowrite8(ctl, port->membase + TIMBUART_CTRL);
+                        port->icount.overrun++;
+                } else if (isr & (RXDP))
+                        timbuart_rx_chars(port);
+
+                /* ack all RX interrupts */
+                iowrite32(RXFLAGS, port->membase + TIMBUART_ISR);
+        }
+
+        /* always have the RX interrupts enabled */
+        *ier |= RXBAF | RXBF | RXTT;
+
+        dev_dbg(port->dev, "%s - leaving\n", __func__);
+}
+
+void timbuart_tasklet(unsigned long arg)
+{
+        struct timbuart_port *uart = (struct timbuart_port *)arg;
+        u32 isr, ier = 0;
+
+        spin_lock(&uart->port.lock);
+
+        isr = ioread32(uart->port.membase + TIMBUART_ISR);
+        dev_dbg(uart->port.dev, "%s ISR: %x\n", __func__, isr);
+
+        if (!uart->usedma)
+                timbuart_handle_tx_port(&uart->port, isr, &ier);
+
+        timbuart_mctrl_check(&uart->port, isr, &ier);
+
+        if (!uart->usedma)
+                timbuart_handle_rx_port(&uart->port, isr, &ier);
+
+        iowrite32(ier, uart->port.membase + TIMBUART_IER);
+
+        spin_unlock(&uart->port.lock);
+        dev_dbg(uart->port.dev, "%s leaving\n", __func__);
+}
+
+static unsigned int timbuart_get_mctrl(struct uart_port *port)
+{
+        u8 cts = ioread8(port->membase + TIMBUART_CTRL);
+        dev_dbg(port->dev, "%s - cts %x\n", __func__, cts);
+
+        if (cts & TIMBUART_CTRL_CTS)
+                return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+        else
+                return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void timbuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        dev_dbg(port->dev, "%s - %x\n", __func__, mctrl);
+
+        if (mctrl & TIOCM_RTS)
+                iowrite8(TIMBUART_CTRL_RTS, port->membase + TIMBUART_CTRL);
+        else
+                iowrite8(0, port->membase + TIMBUART_CTRL);
+}
+
+static void timbuart_mctrl_check(struct uart_port *port, u32 isr, u32 *ier)
+{
+        unsigned int cts;
+
+        if (isr & CTS_DELTA) {
+                /* ack */
+                iowrite32(CTS_DELTA, port->membase + TIMBUART_ISR);
+                cts = timbuart_get_mctrl(port);
+                uart_handle_cts_change(port, cts & TIOCM_CTS);
+                wake_up_interruptible(&port->state->port.delta_msr_wait);
+        }
+
+        *ier |= CTS_DELTA;
+}
+
+static void timbuart_enable_ms(struct uart_port *port)
+{
+        /* N/A */
+}
+
+static void timbuart_break_ctl(struct uart_port *port, int ctl)
+{
+        /* N/A */
+}
+
+static int timbuart_startup(struct uart_port *port)
+{
+        struct timbuart_port *uart =
+                container_of(port, struct timbuart_port, port);
+
+        dev_dbg(port->dev, "%s\n", __func__);
+
+        iowrite8(TIMBUART_CTRL_FLSHRX, port->membase + TIMBUART_CTRL);
+        iowrite32(0x1ff, port->membase + TIMBUART_ISR);
+        /* Enable all but TX interrupts */
+        iowrite32(RXBAF | RXBF | RXTT | CTS_DELTA,
+                port->membase + TIMBUART_IER);
+
+        return request_irq(port->irq, timbuart_handleinterrupt, IRQF_SHARED,
+                "timb-uart", uart);
+}
+
+static void timbuart_shutdown(struct uart_port *port)
+{
+        struct timbuart_port *uart =
+                container_of(port, struct timbuart_port, port);
+        dev_dbg(port->dev, "%s\n", __func__);
+        free_irq(port->irq, uart);
+        iowrite32(0, port->membase + TIMBUART_IER);
+}
+
+static int get_bindex(int baud)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(baudrates); i++)
+                if (baud <= baudrates[i])
+                        return i;
+
+        return -1;
+}
+
+static void timbuart_set_termios(struct uart_port *port,
+        struct ktermios *termios,
+        struct ktermios *old)
+{
+        unsigned int baud;
+        short bindex;
+        unsigned long flags;
+
+        baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
+        bindex = get_bindex(baud);
+        dev_dbg(port->dev, "%s - bindex %d\n", __func__, bindex);
+
+        if (bindex < 0)
+                bindex = 0;
+        baud = baudrates[bindex];
+
+        /* The serial layer calls into this once with old = NULL when setting
+           up initially */
+        if (old)
+                tty_termios_copy_hw(termios, old);
+        tty_termios_encode_baud_rate(termios, baud, baud);
+
+        spin_lock_irqsave(&port->lock, flags);
+        iowrite8((u8)bindex, port->membase + TIMBUART_BAUDRATE);
+        uart_update_timeout(port, termios->c_cflag, baud);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *timbuart_type(struct uart_port *port)
+{
+        return port->type == PORT_UNKNOWN ? "timbuart" : NULL;
+}
+
+/* We do not request/release mappings of the registers here,
+ * currently it's done in the proble function.
+ */
+static void timbuart_release_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        int size =
+                resource_size(platform_get_resource(pdev, IORESOURCE_MEM, 0));
+
+        if (port->flags & UPF_IOREMAP) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+
+        release_mem_region(port->mapbase, size);
+}
+
+static int timbuart_request_port(struct uart_port *port)
+{
+        struct platform_device *pdev = to_platform_device(port->dev);
+        int size =
+                resource_size(platform_get_resource(pdev, IORESOURCE_MEM, 0));
+
+        if (!request_mem_region(port->mapbase, size, "timb-uart"))
+                return -EBUSY;
+
+        if (port->flags & UPF_IOREMAP) {
+                port->membase = ioremap(port->mapbase, size);
+                if (port->membase == NULL) {
+                        release_mem_region(port->mapbase, size);
+                        return -ENOMEM;
+                }
+        }
+
+        return 0;
+}
+
+static irqreturn_t timbuart_handleinterrupt(int irq, void *devid)
+{
+        struct timbuart_port *uart = (struct timbuart_port *)devid;
+
+        if (ioread8(uart->port.membase + TIMBUART_IPR)) {
+                uart->last_ier = ioread32(uart->port.membase + TIMBUART_IER);
+
+                /* disable interrupts, the tasklet enables them again */
+                iowrite32(0, uart->port.membase + TIMBUART_IER);
+
+                /* fire off bottom half */
+                tasklet_schedule(&uart->tasklet);
+
+                return IRQ_HANDLED;
+        } else
+                return IRQ_NONE;
+}
+
+/*
+ * Configure/autoconfigure the port.
+ */
+static void timbuart_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_TIMBUART;
+                timbuart_request_port(port);
+        }
+}
+
+static int timbuart_verify_port(struct uart_port *port,
+        struct serial_struct *ser)
+{
+        /* we don't want the core code to modify any port params */
+        return -EINVAL;
+}
+
+static struct uart_ops timbuart_ops = {
+        .tx_empty = timbuart_tx_empty,
+        .set_mctrl = timbuart_set_mctrl,
+        .get_mctrl = timbuart_get_mctrl,
+        .stop_tx = timbuart_stop_tx,
+        .start_tx = timbuart_start_tx,
+        .flush_buffer = timbuart_flush_buffer,
+        .stop_rx = timbuart_stop_rx,
+        .enable_ms = timbuart_enable_ms,
+        .break_ctl = timbuart_break_ctl,
+        .startup = timbuart_startup,
+        .shutdown = timbuart_shutdown,
+        .set_termios = timbuart_set_termios,
+        .type = timbuart_type,
+        .release_port = timbuart_release_port,
+        .request_port = timbuart_request_port,
+        .config_port = timbuart_config_port,
+        .verify_port = timbuart_verify_port
+};
+
+static struct uart_driver timbuart_driver = {
+        .owner = THIS_MODULE,
+        .driver_name = "timberdale_uart",
+        .dev_name = "ttyTU",
+        .major = TIMBUART_MAJOR,
+        .minor = TIMBUART_MINOR,
+        .nr = 1
+};
+
+static int __devinit timbuart_probe(struct platform_device *dev)
+{
+        int err, irq;
+        struct timbuart_port *uart;
+        struct resource *iomem;
+
+        dev_dbg(&dev->dev, "%s\n", __func__);
+
+        uart = kzalloc(sizeof(*uart), GFP_KERNEL);
+        if (!uart) {
+                err = -EINVAL;
+                goto err_mem;
+        }
+
+        uart->usedma = 0;
+
+        uart->port.uartclk = 3250000 * 16;
+        uart->port.fifosize  = TIMBUART_FIFO_SIZE;
+        uart->port.regshift  = 2;
+        uart->port.iotype  = UPIO_MEM;
+        uart->port.ops = &timbuart_ops;
+        uart->port.irq = 0;
+        uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+        uart->port.line  = 0;
+        uart->port.dev  = &dev->dev;
+
+        iomem = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        if (!iomem) {
+                err = -ENOMEM;
+                goto err_register;
+        }
+        uart->port.mapbase = iomem->start;
+        uart->port.membase = NULL;
+
+        irq = platform_get_irq(dev, 0);
+        if (irq < 0) {
+                err = -EINVAL;
+                goto err_register;
+        }
+        uart->port.irq = irq;
+
+        tasklet_init(&uart->tasklet, timbuart_tasklet, (unsigned long)uart);
+
+        err = uart_register_driver(&timbuart_driver);
+        if (err)
+                goto err_register;
+
+        err = uart_add_one_port(&timbuart_driver, &uart->port);
+        if (err)
+                goto err_add_port;
+
+        platform_set_drvdata(dev, uart);
+
+        return 0;
+
+err_add_port:
+        uart_unregister_driver(&timbuart_driver);
+err_register:
+        kfree(uart);
+err_mem:
+        printk(KERN_ERR "timberdale: Failed to register Timberdale UART: %d\n",
+                err);
+
+        return err;
+}
+
+static int __devexit timbuart_remove(struct platform_device *dev)
+{
+        struct timbuart_port *uart = platform_get_drvdata(dev);
+
+        tasklet_kill(&uart->tasklet);
+        uart_remove_one_port(&timbuart_driver, &uart->port);
+        uart_unregister_driver(&timbuart_driver);
+        kfree(uart);
+
+        return 0;
+}
+
+static struct platform_driver timbuart_platform_driver = {
+        .driver = {
+                .name   = "timb-uart",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = timbuart_probe,
+        .remove         = __devexit_p(timbuart_remove),
+};
+
+/*--------------------------------------------------------------------------*/
+
+static int __init timbuart_init(void)
+{
+        return platform_driver_register(&timbuart_platform_driver);
+}
+
+static void __exit timbuart_exit(void)
+{
+        platform_driver_unregister(&timbuart_platform_driver);
+}
+
+module_init(timbuart_init);
+module_exit(timbuart_exit);
+
+MODULE_DESCRIPTION("Timberdale UART driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:timb-uart");
+
diff --git a/drivers/tty/serial/timbuart.h b/drivers/tty/serial/timbuart.h
new file mode 100644
index 000000000000..7e566766bc43
--- /dev/null
+++ b/drivers/tty/serial/timbuart.h
@@ -0,0 +1,58 @@
+/*
+ * timbuart.c timberdale FPGA GPIO driver
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * Timberdale FPGA UART
+ */
+
+#ifndef _TIMBUART_H
+#define _TIMBUART_H
+
+#define TIMBUART_FIFO_SIZE      2048
+
+#define TIMBUART_RXFIFO         0x08
+#define TIMBUART_TXFIFO         0x0c
+#define TIMBUART_IER            0x10
+#define TIMBUART_IPR            0x14
+#define TIMBUART_ISR            0x18
+#define TIMBUART_CTRL           0x1c
+#define TIMBUART_BAUDRATE       0x20
+
+#define TIMBUART_CTRL_RTS       0x01
+#define TIMBUART_CTRL_CTS       0x02
+#define TIMBUART_CTRL_FLSHTX    0x40
+#define TIMBUART_CTRL_FLSHRX    0x80
+
+#define TXBF            0x01
+#define TXBAE           0x02
+#define CTS_DELTA       0x04
+#define RXDP            0x08
+#define RXBAF           0x10
+#define RXBF            0x20
+#define RXTT            0x40
+#define RXBNAE          0x80
+#define TXBE            0x100
+
+#define RXFLAGS (RXDP | RXBAF | RXBF | RXTT | RXBNAE)
+#define TXFLAGS (TXBF | TXBAE)
+
+#define TIMBUART_MAJOR 204
+#define TIMBUART_MINOR 192
+
+#endif /* _TIMBUART_H */
+
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
new file mode 100644
index 000000000000..8af1ed83a4c0
--- /dev/null
+++ b/drivers/tty/serial/uartlite.c
@@ -0,0 +1,654 @@
+/*
+ * uartlite.c: Serial driver for Xilinx uartlite serial controller
+ *
+ * Copyright (C) 2006 Peter Korsgaard <jacmet@sunsite.dk>
+ * Copyright (C) 2007 Secret Lab Technologies Ltd.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/console.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <asm/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+
+#define ULITE_NAME              "ttyUL"
+#define ULITE_MAJOR             204
+#define ULITE_MINOR             187
+#define ULITE_NR_UARTS          4
+
+/* ---------------------------------------------------------------------
+ * Register definitions
+ *
+ * For register details see datasheet:
+ * http://www.xilinx.com/support/documentation/ip_documentation/opb_uartlite.pdf 
+ */
+
+#define ULITE_RX                0x00
+#define ULITE_TX                0x04
+#define ULITE_STATUS            0x08
+#define ULITE_CONTROL           0x0c
+
+#define ULITE_REGION            16
+
+#define ULITE_STATUS_RXVALID    0x01
+#define ULITE_STATUS_RXFULL     0x02
+#define ULITE_STATUS_TXEMPTY    0x04
+#define ULITE_STATUS_TXFULL     0x08
+#define ULITE_STATUS_IE         0x10
+#define ULITE_STATUS_OVERRUN    0x20
+#define ULITE_STATUS_FRAME      0x40
+#define ULITE_STATUS_PARITY     0x80
+
+#define ULITE_CONTROL_RST_TX    0x01
+#define ULITE_CONTROL_RST_RX    0x02
+#define ULITE_CONTROL_IE        0x10
+
+
+static struct uart_port ulite_ports[ULITE_NR_UARTS];
+
+/* ---------------------------------------------------------------------
+ * Core UART driver operations
+ */
+
+static int ulite_receive(struct uart_port *port, int stat)
+{
+        struct tty_struct *tty = port->state->port.tty;
+        unsigned char ch = 0;
+        char flag = TTY_NORMAL;
+
+        if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
+                     | ULITE_STATUS_FRAME)) == 0)
+                return 0;
+
+        /* stats */
+        if (stat & ULITE_STATUS_RXVALID) {
+                port->icount.rx++;
+                ch = ioread32be(port->membase + ULITE_RX);
+
+                if (stat & ULITE_STATUS_PARITY)
+                        port->icount.parity++;
+        }
+
+        if (stat & ULITE_STATUS_OVERRUN)
+                port->icount.overrun++;
+
+        if (stat & ULITE_STATUS_FRAME)
+                port->icount.frame++;
+
+
+        /* drop byte with parity error if IGNPAR specificed */
+        if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY)
+                stat &= ~ULITE_STATUS_RXVALID;
+
+        stat &= port->read_status_mask;
+
+        if (stat & ULITE_STATUS_PARITY)
+                flag = TTY_PARITY;
+
+
+        stat &= ~port->ignore_status_mask;
+
+        if (stat & ULITE_STATUS_RXVALID)
+                tty_insert_flip_char(tty, ch, flag);
+
+        if (stat & ULITE_STATUS_FRAME)
+                tty_insert_flip_char(tty, 0, TTY_FRAME);
+
+        if (stat & ULITE_STATUS_OVERRUN)
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+
+        return 1;
+}
+
+static int ulite_transmit(struct uart_port *port, int stat)
+{
+        struct circ_buf *xmit  = &port->state->xmit;
+
+        if (stat & ULITE_STATUS_TXFULL)
+                return 0;
+
+        if (port->x_char) {
+                iowrite32be(port->x_char, port->membase + ULITE_TX);
+                port->x_char = 0;
+                port->icount.tx++;
+                return 1;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+                return 0;
+
+        iowrite32be(xmit->buf[xmit->tail], port->membase + ULITE_TX);
+        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
+        port->icount.tx++;
+
+        /* wake up */
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        return 1;
+}
+
+static irqreturn_t ulite_isr(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        int busy, n = 0;
+
+        do {
+                int stat = ioread32be(port->membase + ULITE_STATUS);
+                busy  = ulite_receive(port, stat);
+                busy |= ulite_transmit(port, stat);
+                n++;
+        } while (busy);
+
+        /* work done? */
+        if (n > 1) {
+                tty_flip_buffer_push(port->state->port.tty);
+                return IRQ_HANDLED;
+        } else {
+                return IRQ_NONE;
+        }
+}
+
+static unsigned int ulite_tx_empty(struct uart_port *port)
+{
+        unsigned long flags;
+        unsigned int ret;
+
+        spin_lock_irqsave(&port->lock, flags);
+        ret = ioread32be(port->membase + ULITE_STATUS);
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int ulite_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        /* N/A */
+}
+
+static void ulite_stop_tx(struct uart_port *port)
+{
+        /* N/A */
+}
+
+static void ulite_start_tx(struct uart_port *port)
+{
+        ulite_transmit(port, ioread32be(port->membase + ULITE_STATUS));
+}
+
+static void ulite_stop_rx(struct uart_port *port)
+{
+        /* don't forward any more data (like !CREAD) */
+        port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
+                | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
+}
+
+static void ulite_enable_ms(struct uart_port *port)
+{
+        /* N/A */
+}
+
+static void ulite_break_ctl(struct uart_port *port, int ctl)
+{
+        /* N/A */
+}
+
+static int ulite_startup(struct uart_port *port)
+{
+        int ret;
+
+        ret = request_irq(port->irq, ulite_isr,
+                          IRQF_SHARED | IRQF_SAMPLE_RANDOM, "uartlite", port);
+        if (ret)
+                return ret;
+
+        iowrite32be(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
+               port->membase + ULITE_CONTROL);
+        iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
+
+        return 0;
+}
+
+static void ulite_shutdown(struct uart_port *port)
+{
+        iowrite32be(0, port->membase + ULITE_CONTROL);
+        ioread32be(port->membase + ULITE_CONTROL); /* dummy */
+        free_irq(port->irq, port);
+}
+
+static void ulite_set_termios(struct uart_port *port, struct ktermios *termios,
+                              struct ktermios *old)
+{
+        unsigned long flags;
+        unsigned int baud;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
+                | ULITE_STATUS_TXFULL;
+
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |=
+                        ULITE_STATUS_PARITY | ULITE_STATUS_FRAME;
+
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= ULITE_STATUS_PARITY
+                        | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
+
+        /* ignore all characters if CREAD is not set */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->ignore_status_mask |=
+                        ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
+                        | ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
+
+        /* update timeout */
+        baud = uart_get_baud_rate(port, termios, old, 0, 460800);
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *ulite_type(struct uart_port *port)
+{
+        return port->type == PORT_UARTLITE ? "uartlite" : NULL;
+}
+
+static void ulite_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, ULITE_REGION);
+        iounmap(port->membase);
+        port->membase = NULL;
+}
+
+static int ulite_request_port(struct uart_port *port)
+{
+        pr_debug("ulite console: port=%p; port->mapbase=%llx\n",
+                 port, (unsigned long long) port->mapbase);
+
+        if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
+                dev_err(port->dev, "Memory region busy\n");
+                return -EBUSY;
+        }
+
+        port->membase = ioremap(port->mapbase, ULITE_REGION);
+        if (!port->membase) {
+                dev_err(port->dev, "Unable to map registers\n");
+                release_mem_region(port->mapbase, ULITE_REGION);
+                return -EBUSY;
+        }
+
+        return 0;
+}
+
+static void ulite_config_port(struct uart_port *port, int flags)
+{
+        if (!ulite_request_port(port))
+                port->type = PORT_UARTLITE;
+}
+
+static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+        /* we don't want the core code to modify any port params */
+        return -EINVAL;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+static int ulite_get_poll_char(struct uart_port *port)
+{
+        if (!(ioread32be(port->membase + ULITE_STATUS)
+                                                & ULITE_STATUS_RXVALID))
+                return NO_POLL_CHAR;
+
+        return ioread32be(port->membase + ULITE_RX);
+}
+
+static void ulite_put_poll_char(struct uart_port *port, unsigned char ch)
+{
+        while (ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_TXFULL)
+                cpu_relax();
+
+        /* write char to device */
+        iowrite32be(ch, port->membase + ULITE_TX);
+}
+#endif
+
+static struct uart_ops ulite_ops = {
+        .tx_empty       = ulite_tx_empty,
+        .set_mctrl      = ulite_set_mctrl,
+        .get_mctrl      = ulite_get_mctrl,
+        .stop_tx        = ulite_stop_tx,
+        .start_tx       = ulite_start_tx,
+        .stop_rx        = ulite_stop_rx,
+        .enable_ms      = ulite_enable_ms,
+        .break_ctl      = ulite_break_ctl,
+        .startup        = ulite_startup,
+        .shutdown       = ulite_shutdown,
+        .set_termios    = ulite_set_termios,
+        .type           = ulite_type,
+        .release_port   = ulite_release_port,
+        .request_port   = ulite_request_port,
+        .config_port    = ulite_config_port,
+        .verify_port    = ulite_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char  = ulite_get_poll_char,
+        .poll_put_char  = ulite_put_poll_char,
+#endif
+};
+
+/* ---------------------------------------------------------------------
+ * Console driver operations
+ */
+
+#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
+static void ulite_console_wait_tx(struct uart_port *port)
+{
+        int i;
+        u8 val;
+
+        /* Spin waiting for TX fifo to have space available */
+        for (i = 0; i < 100000; i++) {
+                val = ioread32be(port->membase + ULITE_STATUS);
+                if ((val & ULITE_STATUS_TXFULL) == 0)
+                        break;
+                cpu_relax();
+        }
+}
+
+static void ulite_console_putchar(struct uart_port *port, int ch)
+{
+        ulite_console_wait_tx(port);
+        iowrite32be(ch, port->membase + ULITE_TX);
+}
+
+static void ulite_console_write(struct console *co, const char *s,
+                                unsigned int count)
+{
+        struct uart_port *port = &ulite_ports[co->index];
+        unsigned long flags;
+        unsigned int ier;
+        int locked = 1;
+
+        if (oops_in_progress) {
+                locked = spin_trylock_irqsave(&port->lock, flags);
+        } else
+                spin_lock_irqsave(&port->lock, flags);
+
+        /* save and disable interrupt */
+        ier = ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
+        iowrite32be(0, port->membase + ULITE_CONTROL);
+
+        uart_console_write(port, s, count, ulite_console_putchar);
+
+        ulite_console_wait_tx(port);
+
+        /* restore interrupt state */
+        if (ier)
+                iowrite32be(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
+
+        if (locked)
+                spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static int __devinit ulite_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (co->index < 0 || co->index >= ULITE_NR_UARTS)
+                return -EINVAL;
+
+        port = &ulite_ports[co->index];
+
+        /* Has the device been initialized yet? */
+        if (!port->mapbase) {
+                pr_debug("console on ttyUL%i not present\n", co->index);
+                return -ENODEV;
+        }
+
+        /* not initialized yet? */
+        if (!port->membase) {
+                if (ulite_request_port(port))
+                        return -ENODEV;
+        }
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver ulite_uart_driver;
+
+static struct console ulite_console = {
+        .name   = ULITE_NAME,
+        .write  = ulite_console_write,
+        .device = uart_console_device,
+        .setup  = ulite_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */
+        .data   = &ulite_uart_driver,
+};
+
+static int __init ulite_console_init(void)
+{
+        register_console(&ulite_console);
+        return 0;
+}
+
+console_initcall(ulite_console_init);
+
+#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
+
+static struct uart_driver ulite_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "uartlite",
+        .dev_name       = ULITE_NAME,
+        .major          = ULITE_MAJOR,
+        .minor          = ULITE_MINOR,
+        .nr             = ULITE_NR_UARTS,
+#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
+        .cons           = &ulite_console,
+#endif
+};
+
+/* ---------------------------------------------------------------------
+ * Port assignment functions (mapping devices to uart_port structures)
+ */
+
+/** ulite_assign: register a uartlite device with the driver
+ *
+ * @dev: pointer to device structure
+ * @id: requested id number.  Pass -1 for automatic port assignment
+ * @base: base address of uartlite registers
+ * @irq: irq number for uartlite
+ *
+ * Returns: 0 on success, <0 otherwise
+ */
+static int __devinit ulite_assign(struct device *dev, int id, u32 base, int irq)
+{
+        struct uart_port *port;
+        int rc;
+
+        /* if id = -1; then scan for a free id and use that */
+        if (id < 0) {
+                for (id = 0; id < ULITE_NR_UARTS; id++)
+                        if (ulite_ports[id].mapbase == 0)
+                                break;
+        }
+        if (id < 0 || id >= ULITE_NR_UARTS) {
+                dev_err(dev, "%s%i too large\n", ULITE_NAME, id);
+                return -EINVAL;
+        }
+
+        if ((ulite_ports[id].mapbase) && (ulite_ports[id].mapbase != base)) {
+                dev_err(dev, "cannot assign to %s%i; it is already in use\n",
+                        ULITE_NAME, id);
+                return -EBUSY;
+        }
+
+        port = &ulite_ports[id];
+
+        spin_lock_init(&port->lock);
+        port->fifosize = 16;
+        port->regshift = 2;
+        port->iotype = UPIO_MEM;
+        port->iobase = 1; /* mark port in use */
+        port->mapbase = base;
+        port->membase = NULL;
+        port->ops = &ulite_ops;
+        port->irq = irq;
+        port->flags = UPF_BOOT_AUTOCONF;
+        port->dev = dev;
+        port->type = PORT_UNKNOWN;
+        port->line = id;
+
+        dev_set_drvdata(dev, port);
+
+        /* Register the port */
+        rc = uart_add_one_port(&ulite_uart_driver, port);
+        if (rc) {
+                dev_err(dev, "uart_add_one_port() failed; err=%i\n", rc);
+                port->mapbase = 0;
+                dev_set_drvdata(dev, NULL);
+                return rc;
+        }
+
+        return 0;
+}
+
+/** ulite_release: register a uartlite device with the driver
+ *
+ * @dev: pointer to device structure
+ */
+static int __devexit ulite_release(struct device *dev)
+{
+        struct uart_port *port = dev_get_drvdata(dev);
+        int rc = 0;
+
+        if (port) {
+                rc = uart_remove_one_port(&ulite_uart_driver, port);
+                dev_set_drvdata(dev, NULL);
+                port->mapbase = 0;
+        }
+
+        return rc;
+}
+
+/* ---------------------------------------------------------------------
+ * Platform bus binding
+ */
+
+#if defined(CONFIG_OF)
+/* Match table for of_platform binding */
+static struct of_device_id ulite_of_match[] __devinitdata = {
+        { .compatible = "xlnx,opb-uartlite-1.00.b", },
+        { .compatible = "xlnx,xps-uartlite-1.00.a", },
+        {}
+};
+MODULE_DEVICE_TABLE(of, ulite_of_match);
+#else /* CONFIG_OF */
+#define ulite_of_match NULL
+#endif /* CONFIG_OF */
+
+static int __devinit ulite_probe(struct platform_device *pdev)
+{
+        struct resource *res, *res2;
+        int id = pdev->id;
+#ifdef CONFIG_OF
+        const __be32 *prop;
+
+        prop = of_get_property(pdev->dev.of_node, "port-number", NULL);
+        if (prop)
+                id = be32_to_cpup(prop);
+#endif
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENODEV;
+
+        res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!res2)
+                return -ENODEV;
+
+        return ulite_assign(&pdev->dev, id, res->start, res2->start);
+}
+
+static int __devexit ulite_remove(struct platform_device *pdev)
+{
+        return ulite_release(&pdev->dev);
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:uartlite");
+
+static struct platform_driver ulite_platform_driver = {
+        .probe = ulite_probe,
+        .remove = __devexit_p(ulite_remove),
+        .driver = {
+                .owner = THIS_MODULE,
+                .name  = "uartlite",
+                .of_match_table = ulite_of_match,
+        },
+};
+
+/* ---------------------------------------------------------------------
+ * Module setup/teardown
+ */
+
+int __init ulite_init(void)
+{
+        int ret;
+
+        pr_debug("uartlite: calling uart_register_driver()\n");
+        ret = uart_register_driver(&ulite_uart_driver);
+        if (ret)
+                goto err_uart;
+
+        pr_debug("uartlite: calling platform_driver_register()\n");
+        ret = platform_driver_register(&ulite_platform_driver);
+        if (ret)
+                goto err_plat;
+
+        return 0;
+
+err_plat:
+        uart_unregister_driver(&ulite_uart_driver);
+err_uart:
+        printk(KERN_ERR "registering uartlite driver failed: err=%i", ret);
+        return ret;
+}
+
+void __exit ulite_exit(void)
+{
+        platform_driver_unregister(&ulite_platform_driver);
+        uart_unregister_driver(&ulite_uart_driver);
+}
+
+module_init(ulite_init);
+module_exit(ulite_exit);
+
+MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
+MODULE_DESCRIPTION("Xilinx uartlite serial driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
new file mode 100644
index 000000000000..c327218cad44
--- /dev/null
+++ b/drivers/tty/serial/ucc_uart.c
@@ -0,0 +1,1539 @@
+/*
+ * Freescale QUICC Engine UART device driver
+ *
+ * Author: Timur Tabi <timur@freescale.com>
+ *
+ * Copyright 2007 Freescale Semiconductor, Inc.  This file is licensed under
+ * the terms of the GNU General Public License version 2.  This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * This driver adds support for UART devices via Freescale's QUICC Engine
+ * found on some Freescale SOCs.
+ *
+ * If Soft-UART support is needed but not already present, then this driver
+ * will request and upload the "Soft-UART" microcode upon probe.  The
+ * filename of the microcode should be fsl_qe_ucode_uart_X_YZ.bin, where "X"
+ * is the name of the SOC (e.g. 8323), and YZ is the revision of the SOC,
+ * (e.g. "11" for 1.1).
+ */
+
+#include <linux/module.h>
+#include <linux/serial.h>
+#include <linux/slab.h>
+#include <linux/serial_core.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+#include <linux/dma-mapping.h>
+
+#include <linux/fs_uart_pd.h>
+#include <asm/ucc_slow.h>
+
+#include <linux/firmware.h>
+#include <asm/reg.h>
+
+/*
+ * The GUMR flag for Soft UART.  This would normally be defined in qe.h,
+ * but Soft-UART is a hack and we want to keep everything related to it in
+ * this file.
+ */
+#define UCC_SLOW_GUMR_H_SUART           0x00004000      /* Soft-UART */
+
+/*
+ * soft_uart is 1 if we need to use Soft-UART mode
+ */
+static int soft_uart;
+/*
+ * firmware_loaded is 1 if the firmware has been loaded, 0 otherwise.
+ */
+static int firmware_loaded;
+
+/* Enable this macro to configure all serial ports in internal loopback
+   mode */
+/* #define LOOPBACK */
+
+/* The major and minor device numbers are defined in
+ * http://www.lanana.org/docs/device-list/devices-2.6+.txt.  For the QE
+ * UART, we have major number 204 and minor numbers 46 - 49, which are the
+ * same as for the CPM2.  This decision was made because no Freescale part
+ * has both a CPM and a QE.
+ */
+#define SERIAL_QE_MAJOR 204
+#define SERIAL_QE_MINOR 46
+
+/* Since we only have minor numbers 46 - 49, there is a hard limit of 4 ports */
+#define UCC_MAX_UART    4
+
+/* The number of buffer descriptors for receiving characters. */
+#define RX_NUM_FIFO     4
+
+/* The number of buffer descriptors for transmitting characters. */
+#define TX_NUM_FIFO     4
+
+/* The maximum size of the character buffer for a single RX BD. */
+#define RX_BUF_SIZE     32
+
+/* The maximum size of the character buffer for a single TX BD. */
+#define TX_BUF_SIZE     32
+
+/*
+ * The number of jiffies to wait after receiving a close command before the
+ * device is actually closed.  This allows the last few characters to be
+ * sent over the wire.
+ */
+#define UCC_WAIT_CLOSING 100
+
+struct ucc_uart_pram {
+        struct ucc_slow_pram common;
+        u8 res1[8];             /* reserved */
+        __be16 maxidl;          /* Maximum idle chars */
+        __be16 idlc;            /* temp idle counter */
+        __be16 brkcr;           /* Break count register */
+        __be16 parec;           /* receive parity error counter */
+        __be16 frmec;           /* receive framing error counter */
+        __be16 nosec;           /* receive noise counter */
+        __be16 brkec;           /* receive break condition counter */
+        __be16 brkln;           /* last received break length */
+        __be16 uaddr[2];        /* UART address character 1 & 2 */
+        __be16 rtemp;           /* Temp storage */
+        __be16 toseq;           /* Transmit out of sequence char */
+        __be16 cchars[8];       /* control characters 1-8 */
+        __be16 rccm;            /* receive control character mask */
+        __be16 rccr;            /* receive control character register */
+        __be16 rlbc;            /* receive last break character */
+        __be16 res2;            /* reserved */
+        __be32 res3;            /* reserved, should be cleared */
+        u8 res4;                /* reserved, should be cleared */
+        u8 res5[3];             /* reserved, should be cleared */
+        __be32 res6;            /* reserved, should be cleared */
+        __be32 res7;            /* reserved, should be cleared */
+        __be32 res8;            /* reserved, should be cleared */
+        __be32 res9;            /* reserved, should be cleared */
+        __be32 res10;           /* reserved, should be cleared */
+        __be32 res11;           /* reserved, should be cleared */
+        __be32 res12;           /* reserved, should be cleared */
+        __be32 res13;           /* reserved, should be cleared */
+/* The rest is for Soft-UART only */
+        __be16 supsmr;          /* 0x90, Shadow UPSMR */
+        __be16 res92;           /* 0x92, reserved, initialize to 0 */
+        __be32 rx_state;        /* 0x94, RX state, initialize to 0 */
+        __be32 rx_cnt;          /* 0x98, RX count, initialize to 0 */
+        u8 rx_length;           /* 0x9C, Char length, set to 1+CL+PEN+1+SL */
+        u8 rx_bitmark;          /* 0x9D, reserved, initialize to 0 */
+        u8 rx_temp_dlst_qe;     /* 0x9E, reserved, initialize to 0 */
+        u8 res14[0xBC - 0x9F];  /* reserved */
+        __be32 dump_ptr;        /* 0xBC, Dump pointer */
+        __be32 rx_frame_rem;    /* 0xC0, reserved, initialize to 0 */
+        u8 rx_frame_rem_size;   /* 0xC4, reserved, initialize to 0 */
+        u8 tx_mode;             /* 0xC5, mode, 0=AHDLC, 1=UART */
+        __be16 tx_state;        /* 0xC6, TX state */
+        u8 res15[0xD0 - 0xC8];  /* reserved */
+        __be32 resD0;           /* 0xD0, reserved, initialize to 0 */
+        u8 resD4;               /* 0xD4, reserved, initialize to 0 */
+        __be16 resD5;           /* 0xD5, reserved, initialize to 0 */
+} __attribute__ ((packed));
+
+/* SUPSMR definitions, for Soft-UART only */
+#define UCC_UART_SUPSMR_SL              0x8000
+#define UCC_UART_SUPSMR_RPM_MASK        0x6000
+#define UCC_UART_SUPSMR_RPM_ODD         0x0000
+#define UCC_UART_SUPSMR_RPM_LOW         0x2000
+#define UCC_UART_SUPSMR_RPM_EVEN        0x4000
+#define UCC_UART_SUPSMR_RPM_HIGH        0x6000
+#define UCC_UART_SUPSMR_PEN             0x1000
+#define UCC_UART_SUPSMR_TPM_MASK        0x0C00
+#define UCC_UART_SUPSMR_TPM_ODD         0x0000
+#define UCC_UART_SUPSMR_TPM_LOW         0x0400
+#define UCC_UART_SUPSMR_TPM_EVEN        0x0800
+#define UCC_UART_SUPSMR_TPM_HIGH        0x0C00
+#define UCC_UART_SUPSMR_FRZ             0x0100
+#define UCC_UART_SUPSMR_UM_MASK         0x00c0
+#define UCC_UART_SUPSMR_UM_NORMAL       0x0000
+#define UCC_UART_SUPSMR_UM_MAN_MULTI    0x0040
+#define UCC_UART_SUPSMR_UM_AUTO_MULTI   0x00c0
+#define UCC_UART_SUPSMR_CL_MASK         0x0030
+#define UCC_UART_SUPSMR_CL_8            0x0030
+#define UCC_UART_SUPSMR_CL_7            0x0020
+#define UCC_UART_SUPSMR_CL_6            0x0010
+#define UCC_UART_SUPSMR_CL_5            0x0000
+
+#define UCC_UART_TX_STATE_AHDLC         0x00
+#define UCC_UART_TX_STATE_UART          0x01
+#define UCC_UART_TX_STATE_X1            0x00
+#define UCC_UART_TX_STATE_X16           0x80
+
+#define UCC_UART_PRAM_ALIGNMENT 0x100
+
+#define UCC_UART_SIZE_OF_BD     UCC_SLOW_SIZE_OF_BD
+#define NUM_CONTROL_CHARS       8
+
+/* Private per-port data structure */
+struct uart_qe_port {
+        struct uart_port port;
+        struct ucc_slow __iomem *uccp;
+        struct ucc_uart_pram __iomem *uccup;
+        struct ucc_slow_info us_info;
+        struct ucc_slow_private *us_private;
+        struct device_node *np;
+        unsigned int ucc_num;   /* First ucc is 0, not 1 */
+
+        u16 rx_nrfifos;
+        u16 rx_fifosize;
+        u16 tx_nrfifos;
+        u16 tx_fifosize;
+        int wait_closing;
+        u32 flags;
+        struct qe_bd *rx_bd_base;
+        struct qe_bd *rx_cur;
+        struct qe_bd *tx_bd_base;
+        struct qe_bd *tx_cur;
+        unsigned char *tx_buf;
+        unsigned char *rx_buf;
+        void *bd_virt;          /* virtual address of the BD buffers */
+        dma_addr_t bd_dma_addr; /* bus address of the BD buffers */
+        unsigned int bd_size;   /* size of BD buffer space */
+};
+
+static struct uart_driver ucc_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "ucc_uart",
+        .dev_name       = "ttyQE",
+        .major          = SERIAL_QE_MAJOR,
+        .minor          = SERIAL_QE_MINOR,
+        .nr             = UCC_MAX_UART,
+};
+
+/*
+ * Virtual to physical address translation.
+ *
+ * Given the virtual address for a character buffer, this function returns
+ * the physical (DMA) equivalent.
+ */
+static inline dma_addr_t cpu2qe_addr(void *addr, struct uart_qe_port *qe_port)
+{
+        if (likely((addr >= qe_port->bd_virt)) &&
+            (addr < (qe_port->bd_virt + qe_port->bd_size)))
+                return qe_port->bd_dma_addr + (addr - qe_port->bd_virt);
+
+        /* something nasty happened */
+        printk(KERN_ERR "%s: addr=%p\n", __func__, addr);
+        BUG();
+        return 0;
+}
+
+/*
+ * Physical to virtual address translation.
+ *
+ * Given the physical (DMA) address for a character buffer, this function
+ * returns the virtual equivalent.
+ */
+static inline void *qe2cpu_addr(dma_addr_t addr, struct uart_qe_port *qe_port)
+{
+        /* sanity check */
+        if (likely((addr >= qe_port->bd_dma_addr) &&
+                   (addr < (qe_port->bd_dma_addr + qe_port->bd_size))))
+                return qe_port->bd_virt + (addr - qe_port->bd_dma_addr);
+
+        /* something nasty happened */
+        printk(KERN_ERR "%s: addr=%x\n", __func__, addr);
+        BUG();
+        return NULL;
+}
+
+/*
+ * Return 1 if the QE is done transmitting all buffers for this port
+ *
+ * This function scans each BD in sequence.  If we find a BD that is not
+ * ready (READY=1), then we return 0 indicating that the QE is still sending
+ * data.  If we reach the last BD (WRAP=1), then we know we've scanned
+ * the entire list, and all BDs are done.
+ */
+static unsigned int qe_uart_tx_empty(struct uart_port *port)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+        struct qe_bd *bdp = qe_port->tx_bd_base;
+
+        while (1) {
+                if (in_be16(&bdp->status) & BD_SC_READY)
+                        /* This BD is not done, so return "not done" */
+                        return 0;
+
+                if (in_be16(&bdp->status) & BD_SC_WRAP)
+                        /*
+                         * This BD is done and it's the last one, so return
+                         * "done"
+                         */
+                        return 1;
+
+                bdp++;
+        };
+}
+
+/*
+ * Set the modem control lines
+ *
+ * Although the QE can control the modem control lines (e.g. CTS), we
+ * don't need that support. This function must exist, however, otherwise
+ * the kernel will panic.
+ */
+void qe_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+/*
+ * Get the current modem control line status
+ *
+ * Although the QE can control the modem control lines (e.g. CTS), this
+ * driver currently doesn't support that, so we always return Carrier
+ * Detect, Data Set Ready, and Clear To Send.
+ */
+static unsigned int qe_uart_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
+}
+
+/*
+ * Disable the transmit interrupt.
+ *
+ * Although this function is called "stop_tx", it does not actually stop
+ * transmission of data.  Instead, it tells the QE to not generate an
+ * interrupt when the UCC is finished sending characters.
+ */
+static void qe_uart_stop_tx(struct uart_port *port)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+
+        clrbits16(&qe_port->uccp->uccm, UCC_UART_UCCE_TX);
+}
+
+/*
+ * Transmit as many characters to the HW as possible.
+ *
+ * This function will attempt to stuff of all the characters from the
+ * kernel's transmit buffer into TX BDs.
+ *
+ * A return value of non-zero indicates that it successfully stuffed all
+ * characters from the kernel buffer.
+ *
+ * A return value of zero indicates that there are still characters in the
+ * kernel's buffer that have not been transmitted, but there are no more BDs
+ * available.  This function should be called again after a BD has been made
+ * available.
+ */
+static int qe_uart_tx_pump(struct uart_qe_port *qe_port)
+{
+        struct qe_bd *bdp;
+        unsigned char *p;
+        unsigned int count;
+        struct uart_port *port = &qe_port->port;
+        struct circ_buf *xmit = &port->state->xmit;
+
+        bdp = qe_port->rx_cur;
+
+        /* Handle xon/xoff */
+        if (port->x_char) {
+                /* Pick next descriptor and fill from buffer */
+                bdp = qe_port->tx_cur;
+
+                p = qe2cpu_addr(bdp->buf, qe_port);
+
+                *p++ = port->x_char;
+                out_be16(&bdp->length, 1);
+                setbits16(&bdp->status, BD_SC_READY);
+                /* Get next BD. */
+                if (in_be16(&bdp->status) & BD_SC_WRAP)
+                        bdp = qe_port->tx_bd_base;
+                else
+                        bdp++;
+                qe_port->tx_cur = bdp;
+
+                port->icount.tx++;
+                port->x_char = 0;
+                return 1;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                qe_uart_stop_tx(port);
+                return 0;
+        }
+
+        /* Pick next descriptor and fill from buffer */
+        bdp = qe_port->tx_cur;
+
+        while (!(in_be16(&bdp->status) & BD_SC_READY) &&
+               (xmit->tail != xmit->head)) {
+                count = 0;
+                p = qe2cpu_addr(bdp->buf, qe_port);
+                while (count < qe_port->tx_fifosize) {
+                        *p++ = xmit->buf[xmit->tail];
+                        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                        port->icount.tx++;
+                        count++;
+                        if (xmit->head == xmit->tail)
+                                break;
+                }
+
+                out_be16(&bdp->length, count);
+                setbits16(&bdp->status, BD_SC_READY);
+
+                /* Get next BD. */
+                if (in_be16(&bdp->status) & BD_SC_WRAP)
+                        bdp = qe_port->tx_bd_base;
+                else
+                        bdp++;
+        }
+        qe_port->tx_cur = bdp;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit)) {
+                /* The kernel buffer is empty, so turn off TX interrupts.  We
+                   don't need to be told when the QE is finished transmitting
+                   the data. */
+                qe_uart_stop_tx(port);
+                return 0;
+        }
+
+        return 1;
+}
+
+/*
+ * Start transmitting data
+ *
+ * This function will start transmitting any available data, if the port
+ * isn't already transmitting data.
+ */
+static void qe_uart_start_tx(struct uart_port *port)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+
+        /* If we currently are transmitting, then just return */
+        if (in_be16(&qe_port->uccp->uccm) & UCC_UART_UCCE_TX)
+                return;
+
+        /* Otherwise, pump the port and start transmission */
+        if (qe_uart_tx_pump(qe_port))
+                setbits16(&qe_port->uccp->uccm, UCC_UART_UCCE_TX);
+}
+
+/*
+ * Stop transmitting data
+ */
+static void qe_uart_stop_rx(struct uart_port *port)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+
+        clrbits16(&qe_port->uccp->uccm, UCC_UART_UCCE_RX);
+}
+
+/*
+ * Enable status change interrupts
+ *
+ * We don't support status change interrupts, but we need to define this
+ * function otherwise the kernel will panic.
+ */
+static void qe_uart_enable_ms(struct uart_port *port)
+{
+}
+
+/* Start or stop sending  break signal
+ *
+ * This function controls the sending of a break signal.  If break_state=1,
+ * then we start sending a break signal.  If break_state=0, then we stop
+ * sending the break signal.
+ */
+static void qe_uart_break_ctl(struct uart_port *port, int break_state)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+
+        if (break_state)
+                ucc_slow_stop_tx(qe_port->us_private);
+        else
+                ucc_slow_restart_tx(qe_port->us_private);
+}
+
+/* ISR helper function for receiving character.
+ *
+ * This function is called by the ISR to handling receiving characters
+ */
+static void qe_uart_int_rx(struct uart_qe_port *qe_port)
+{
+        int i;
+        unsigned char ch, *cp;
+        struct uart_port *port = &qe_port->port;
+        struct tty_struct *tty = port->state->port.tty;
+        struct qe_bd *bdp;
+        u16 status;
+        unsigned int flg;
+
+        /* Just loop through the closed BDs and copy the characters into
+         * the buffer.
+         */
+        bdp = qe_port->rx_cur;
+        while (1) {
+                status = in_be16(&bdp->status);
+
+                /* If this one is empty, then we assume we've read them all */
+                if (status & BD_SC_EMPTY)
+                        break;
+
+                /* get number of characters, and check space in RX buffer */
+                i = in_be16(&bdp->length);
+
+                /* If we don't have enough room in RX buffer for the entire BD,
+                 * then we try later, which will be the next RX interrupt.
+                 */
+                if (tty_buffer_request_room(tty, i) < i) {
+                        dev_dbg(port->dev, "ucc-uart: no room in RX buffer\n");
+                        return;
+                }
+
+                /* get pointer */
+                cp = qe2cpu_addr(bdp->buf, qe_port);
+
+                /* loop through the buffer */
+                while (i-- > 0) {
+                        ch = *cp++;
+                        port->icount.rx++;
+                        flg = TTY_NORMAL;
+
+                        if (!i && status &
+                            (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV))
+                                goto handle_error;
+                        if (uart_handle_sysrq_char(port, ch))
+                                continue;
+
+error_return:
+                        tty_insert_flip_char(tty, ch, flg);
+
+                }
+
+                /* This BD is ready to be used again. Clear status. get next */
+                clrsetbits_be16(&bdp->status, BD_SC_BR | BD_SC_FR | BD_SC_PR |
+                        BD_SC_OV | BD_SC_ID, BD_SC_EMPTY);
+                if (in_be16(&bdp->status) & BD_SC_WRAP)
+                        bdp = qe_port->rx_bd_base;
+                else
+                        bdp++;
+
+        }
+
+        /* Write back buffer pointer */
+        qe_port->rx_cur = bdp;
+
+        /* Activate BH processing */
+        tty_flip_buffer_push(tty);
+
+        return;
+
+        /* Error processing */
+
+handle_error:
+        /* Statistics */
+        if (status & BD_SC_BR)
+                port->icount.brk++;
+        if (status & BD_SC_PR)
+                port->icount.parity++;
+        if (status & BD_SC_FR)
+                port->icount.frame++;
+        if (status & BD_SC_OV)
+                port->icount.overrun++;
+
+        /* Mask out ignored conditions */
+        status &= port->read_status_mask;
+
+        /* Handle the remaining ones */
+        if (status & BD_SC_BR)
+                flg = TTY_BREAK;
+        else if (status & BD_SC_PR)
+                flg = TTY_PARITY;
+        else if (status & BD_SC_FR)
+                flg = TTY_FRAME;
+
+        /* Overrun does not affect the current character ! */
+        if (status & BD_SC_OV)
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+#ifdef SUPPORT_SYSRQ
+        port->sysrq = 0;
+#endif
+        goto error_return;
+}
+
+/* Interrupt handler
+ *
+ * This interrupt handler is called after a BD is processed.
+ */
+static irqreturn_t qe_uart_int(int irq, void *data)
+{
+        struct uart_qe_port *qe_port = (struct uart_qe_port *) data;
+        struct ucc_slow __iomem *uccp = qe_port->uccp;
+        u16 events;
+
+        /* Clear the interrupts */
+        events = in_be16(&uccp->ucce);
+        out_be16(&uccp->ucce, events);
+
+        if (events & UCC_UART_UCCE_BRKE)
+                uart_handle_break(&qe_port->port);
+
+        if (events & UCC_UART_UCCE_RX)
+                qe_uart_int_rx(qe_port);
+
+        if (events & UCC_UART_UCCE_TX)
+                qe_uart_tx_pump(qe_port);
+
+        return events ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/* Initialize buffer descriptors
+ *
+ * This function initializes all of the RX and TX buffer descriptors.
+ */
+static void qe_uart_initbd(struct uart_qe_port *qe_port)
+{
+        int i;
+        void *bd_virt;
+        struct qe_bd *bdp;
+
+        /* Set the physical address of the host memory buffers in the buffer
+         * descriptors, and the virtual address for us to work with.
+         */
+        bd_virt = qe_port->bd_virt;
+        bdp = qe_port->rx_bd_base;
+        qe_port->rx_cur = qe_port->rx_bd_base;
+        for (i = 0; i < (qe_port->rx_nrfifos - 1); i++) {
+                out_be16(&bdp->status, BD_SC_EMPTY | BD_SC_INTRPT);
+                out_be32(&bdp->buf, cpu2qe_addr(bd_virt, qe_port));
+                out_be16(&bdp->length, 0);
+                bd_virt += qe_port->rx_fifosize;
+                bdp++;
+        }
+
+        /* */
+        out_be16(&bdp->status, BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT);
+        out_be32(&bdp->buf, cpu2qe_addr(bd_virt, qe_port));
+        out_be16(&bdp->length, 0);
+
+        /* Set the physical address of the host memory
+         * buffers in the buffer descriptors, and the
+         * virtual address for us to work with.
+         */
+        bd_virt = qe_port->bd_virt +
+                L1_CACHE_ALIGN(qe_port->rx_nrfifos * qe_port->rx_fifosize);
+        qe_port->tx_cur = qe_port->tx_bd_base;
+        bdp = qe_port->tx_bd_base;
+        for (i = 0; i < (qe_port->tx_nrfifos - 1); i++) {
+                out_be16(&bdp->status, BD_SC_INTRPT);
+                out_be32(&bdp->buf, cpu2qe_addr(bd_virt, qe_port));
+                out_be16(&bdp->length, 0);
+                bd_virt += qe_port->tx_fifosize;
+                bdp++;
+        }
+
+        /* Loopback requires the preamble bit to be set on the first TX BD */
+#ifdef LOOPBACK
+        setbits16(&qe_port->tx_cur->status, BD_SC_P);
+#endif
+
+        out_be16(&bdp->status, BD_SC_WRAP | BD_SC_INTRPT);
+        out_be32(&bdp->buf, cpu2qe_addr(bd_virt, qe_port));
+        out_be16(&bdp->length, 0);
+}
+
+/*
+ * Initialize a UCC for UART.
+ *
+ * This function configures a given UCC to be used as a UART device. Basic
+ * UCC initialization is handled in qe_uart_request_port().  This function
+ * does all the UART-specific stuff.
+ */
+static void qe_uart_init_ucc(struct uart_qe_port *qe_port)
+{
+        u32 cecr_subblock;
+        struct ucc_slow __iomem *uccp = qe_port->uccp;
+        struct ucc_uart_pram *uccup = qe_port->uccup;
+
+        unsigned int i;
+
+        /* First, disable TX and RX in the UCC */
+        ucc_slow_disable(qe_port->us_private, COMM_DIR_RX_AND_TX);
+
+        /* Program the UCC UART parameter RAM */
+        out_8(&uccup->common.rbmr, UCC_BMR_GBL | UCC_BMR_BO_BE);
+        out_8(&uccup->common.tbmr, UCC_BMR_GBL | UCC_BMR_BO_BE);
+        out_be16(&uccup->common.mrblr, qe_port->rx_fifosize);
+        out_be16(&uccup->maxidl, 0x10);
+        out_be16(&uccup->brkcr, 1);
+        out_be16(&uccup->parec, 0);
+        out_be16(&uccup->frmec, 0);
+        out_be16(&uccup->nosec, 0);
+        out_be16(&uccup->brkec, 0);
+        out_be16(&uccup->uaddr[0], 0);
+        out_be16(&uccup->uaddr[1], 0);
+        out_be16(&uccup->toseq, 0);
+        for (i = 0; i < 8; i++)
+                out_be16(&uccup->cchars[i], 0xC000);
+        out_be16(&uccup->rccm, 0xc0ff);
+
+        /* Configure the GUMR registers for UART */
+        if (soft_uart) {
+                /* Soft-UART requires a 1X multiplier for TX */
+                clrsetbits_be32(&uccp->gumr_l,
+                        UCC_SLOW_GUMR_L_MODE_MASK | UCC_SLOW_GUMR_L_TDCR_MASK |
+                        UCC_SLOW_GUMR_L_RDCR_MASK,
+                        UCC_SLOW_GUMR_L_MODE_UART | UCC_SLOW_GUMR_L_TDCR_1 |
+                        UCC_SLOW_GUMR_L_RDCR_16);
+
+                clrsetbits_be32(&uccp->gumr_h, UCC_SLOW_GUMR_H_RFW,
+                        UCC_SLOW_GUMR_H_TRX | UCC_SLOW_GUMR_H_TTX);
+        } else {
+                clrsetbits_be32(&uccp->gumr_l,
+                        UCC_SLOW_GUMR_L_MODE_MASK | UCC_SLOW_GUMR_L_TDCR_MASK |
+                        UCC_SLOW_GUMR_L_RDCR_MASK,
+                        UCC_SLOW_GUMR_L_MODE_UART | UCC_SLOW_GUMR_L_TDCR_16 |
+                        UCC_SLOW_GUMR_L_RDCR_16);
+
+                clrsetbits_be32(&uccp->gumr_h,
+                        UCC_SLOW_GUMR_H_TRX | UCC_SLOW_GUMR_H_TTX,
+                        UCC_SLOW_GUMR_H_RFW);
+        }
+
+#ifdef LOOPBACK
+        clrsetbits_be32(&uccp->gumr_l, UCC_SLOW_GUMR_L_DIAG_MASK,
+                UCC_SLOW_GUMR_L_DIAG_LOOP);
+        clrsetbits_be32(&uccp->gumr_h,
+                UCC_SLOW_GUMR_H_CTSP | UCC_SLOW_GUMR_H_RSYN,
+                UCC_SLOW_GUMR_H_CDS);
+#endif
+
+        /* Disable rx interrupts  and clear all pending events.  */
+        out_be16(&uccp->uccm, 0);
+        out_be16(&uccp->ucce, 0xffff);
+        out_be16(&uccp->udsr, 0x7e7e);
+
+        /* Initialize UPSMR */
+        out_be16(&uccp->upsmr, 0);
+
+        if (soft_uart) {
+                out_be16(&uccup->supsmr, 0x30);
+                out_be16(&uccup->res92, 0);
+                out_be32(&uccup->rx_state, 0);
+                out_be32(&uccup->rx_cnt, 0);
+                out_8(&uccup->rx_bitmark, 0);
+                out_8(&uccup->rx_length, 10);
+                out_be32(&uccup->dump_ptr, 0x4000);
+                out_8(&uccup->rx_temp_dlst_qe, 0);
+                out_be32(&uccup->rx_frame_rem, 0);
+                out_8(&uccup->rx_frame_rem_size, 0);
+                /* Soft-UART requires TX to be 1X */
+                out_8(&uccup->tx_mode,
+                        UCC_UART_TX_STATE_UART | UCC_UART_TX_STATE_X1);
+                out_be16(&uccup->tx_state, 0);
+                out_8(&uccup->resD4, 0);
+                out_be16(&uccup->resD5, 0);
+
+                /* Set UART mode.
+                 * Enable receive and transmit.
+                 */
+
+                /* From the microcode errata:
+                 * 1.GUMR_L register, set mode=0010 (QMC).
+                 * 2.Set GUMR_H[17] bit. (UART/AHDLC mode).
+                 * 3.Set GUMR_H[19:20] (Transparent mode)
+                 * 4.Clear GUMR_H[26] (RFW)
+                 * ...
+                 * 6.Receiver must use 16x over sampling
+                 */
+                clrsetbits_be32(&uccp->gumr_l,
+                        UCC_SLOW_GUMR_L_MODE_MASK | UCC_SLOW_GUMR_L_TDCR_MASK |
+                        UCC_SLOW_GUMR_L_RDCR_MASK,
+                        UCC_SLOW_GUMR_L_MODE_QMC | UCC_SLOW_GUMR_L_TDCR_16 |
+                        UCC_SLOW_GUMR_L_RDCR_16);
+
+                clrsetbits_be32(&uccp->gumr_h,
+                        UCC_SLOW_GUMR_H_RFW | UCC_SLOW_GUMR_H_RSYN,
+                        UCC_SLOW_GUMR_H_SUART | UCC_SLOW_GUMR_H_TRX |
+                        UCC_SLOW_GUMR_H_TTX | UCC_SLOW_GUMR_H_TFL);
+
+#ifdef LOOPBACK
+                clrsetbits_be32(&uccp->gumr_l, UCC_SLOW_GUMR_L_DIAG_MASK,
+                                UCC_SLOW_GUMR_L_DIAG_LOOP);
+                clrbits32(&uccp->gumr_h, UCC_SLOW_GUMR_H_CTSP |
+                          UCC_SLOW_GUMR_H_CDS);
+#endif
+
+                cecr_subblock = ucc_slow_get_qe_cr_subblock(qe_port->ucc_num);
+                qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
+                        QE_CR_PROTOCOL_UNSPECIFIED, 0);
+        } else {
+                cecr_subblock = ucc_slow_get_qe_cr_subblock(qe_port->ucc_num);
+                qe_issue_cmd(QE_INIT_TX_RX, cecr_subblock,
+                        QE_CR_PROTOCOL_UART, 0);
+        }
+}
+
+/*
+ * Initialize the port.
+ */
+static int qe_uart_startup(struct uart_port *port)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+        int ret;
+
+        /*
+         * If we're using Soft-UART mode, then we need to make sure the
+         * firmware has been uploaded first.
+         */
+        if (soft_uart && !firmware_loaded) {
+                dev_err(port->dev, "Soft-UART firmware not uploaded\n");
+                return -ENODEV;
+        }
+
+        qe_uart_initbd(qe_port);
+        qe_uart_init_ucc(qe_port);
+
+        /* Install interrupt handler. */
+        ret = request_irq(port->irq, qe_uart_int, IRQF_SHARED, "ucc-uart",
+                qe_port);
+        if (ret) {
+                dev_err(port->dev, "could not claim IRQ %u\n", port->irq);
+                return ret;
+        }
+
+        /* Startup rx-int */
+        setbits16(&qe_port->uccp->uccm, UCC_UART_UCCE_RX);
+        ucc_slow_enable(qe_port->us_private, COMM_DIR_RX_AND_TX);
+
+        return 0;
+}
+
+/*
+ * Shutdown the port.
+ */
+static void qe_uart_shutdown(struct uart_port *port)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+        struct ucc_slow __iomem *uccp = qe_port->uccp;
+        unsigned int timeout = 20;
+
+        /* Disable RX and TX */
+
+        /* Wait for all the BDs marked sent */
+        while (!qe_uart_tx_empty(port)) {
+                if (!--timeout) {
+                        dev_warn(port->dev, "shutdown timeout\n");
+                        break;
+                }
+                set_current_state(TASK_UNINTERRUPTIBLE);
+                schedule_timeout(2);
+        }
+
+        if (qe_port->wait_closing) {
+                /* Wait a bit longer */
+                set_current_state(TASK_UNINTERRUPTIBLE);
+                schedule_timeout(qe_port->wait_closing);
+        }
+
+        /* Stop uarts */
+        ucc_slow_disable(qe_port->us_private, COMM_DIR_RX_AND_TX);
+        clrbits16(&uccp->uccm, UCC_UART_UCCE_TX | UCC_UART_UCCE_RX);
+
+        /* Shut them really down and reinit buffer descriptors */
+        ucc_slow_graceful_stop_tx(qe_port->us_private);
+        qe_uart_initbd(qe_port);
+
+        free_irq(port->irq, qe_port);
+}
+
+/*
+ * Set the serial port parameters.
+ */
+static void qe_uart_set_termios(struct uart_port *port,
+                                struct ktermios *termios, struct ktermios *old)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+        struct ucc_slow __iomem *uccp = qe_port->uccp;
+        unsigned int baud;
+        unsigned long flags;
+        u16 upsmr = in_be16(&uccp->upsmr);
+        struct ucc_uart_pram __iomem *uccup = qe_port->uccup;
+        u16 supsmr = in_be16(&uccup->supsmr);
+        u8 char_length = 2; /* 1 + CL + PEN + 1 + SL */
+
+        /* Character length programmed into the mode register is the
+         * sum of: 1 start bit, number of data bits, 0 or 1 parity bit,
+         * 1 or 2 stop bits, minus 1.
+         * The value 'bits' counts this for us.
+         */
+
+        /* byte size */
+        upsmr &= UCC_UART_UPSMR_CL_MASK;
+        supsmr &= UCC_UART_SUPSMR_CL_MASK;
+
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                upsmr |= UCC_UART_UPSMR_CL_5;
+                supsmr |= UCC_UART_SUPSMR_CL_5;
+                char_length += 5;
+                break;
+        case CS6:
+                upsmr |= UCC_UART_UPSMR_CL_6;
+                supsmr |= UCC_UART_SUPSMR_CL_6;
+                char_length += 6;
+                break;
+        case CS7:
+                upsmr |= UCC_UART_UPSMR_CL_7;
+                supsmr |= UCC_UART_SUPSMR_CL_7;
+                char_length += 7;
+                break;
+        default:        /* case CS8 */
+                upsmr |= UCC_UART_UPSMR_CL_8;
+                supsmr |= UCC_UART_SUPSMR_CL_8;
+                char_length += 8;
+                break;
+        }
+
+        /* If CSTOPB is set, we want two stop bits */
+        if (termios->c_cflag & CSTOPB) {
+                upsmr |= UCC_UART_UPSMR_SL;
+                supsmr |= UCC_UART_SUPSMR_SL;
+                char_length++;  /* + SL */
+        }
+
+        if (termios->c_cflag & PARENB) {
+                upsmr |= UCC_UART_UPSMR_PEN;
+                supsmr |= UCC_UART_SUPSMR_PEN;
+                char_length++;  /* + PEN */
+
+                if (!(termios->c_cflag & PARODD)) {
+                        upsmr &= ~(UCC_UART_UPSMR_RPM_MASK |
+                                   UCC_UART_UPSMR_TPM_MASK);
+                        upsmr |= UCC_UART_UPSMR_RPM_EVEN |
+                                UCC_UART_UPSMR_TPM_EVEN;
+                        supsmr &= ~(UCC_UART_SUPSMR_RPM_MASK |
+                                    UCC_UART_SUPSMR_TPM_MASK);
+                        supsmr |= UCC_UART_SUPSMR_RPM_EVEN |
+                                UCC_UART_SUPSMR_TPM_EVEN;
+                }
+        }
+
+        /*
+         * Set up parity check flag
+         */
+        port->read_status_mask = BD_SC_EMPTY | BD_SC_OV;
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= BD_SC_FR | BD_SC_PR;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= BD_SC_BR;
+
+        /*
+         * Characters to ignore
+         */
+        port->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= BD_SC_PR | BD_SC_FR;
+        if (termios->c_iflag & IGNBRK) {
+                port->ignore_status_mask |= BD_SC_BR;
+                /*
+                 * If we're ignore parity and break indicators, ignore
+                 * overruns too.  (For real raw support).
+                 */
+                if (termios->c_iflag & IGNPAR)
+                        port->ignore_status_mask |= BD_SC_OV;
+        }
+        /*
+         * !!! ignore all characters if CREAD is not set
+         */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->read_status_mask &= ~BD_SC_EMPTY;
+
+        baud = uart_get_baud_rate(port, termios, old, 0, 115200);
+
+        /* Do we really need a spinlock here? */
+        spin_lock_irqsave(&port->lock, flags);
+
+        out_be16(&uccp->upsmr, upsmr);
+        if (soft_uart) {
+                out_be16(&uccup->supsmr, supsmr);
+                out_8(&uccup->rx_length, char_length);
+
+                /* Soft-UART requires a 1X multiplier for TX */
+                qe_setbrg(qe_port->us_info.rx_clock, baud, 16);
+                qe_setbrg(qe_port->us_info.tx_clock, baud, 1);
+        } else {
+                qe_setbrg(qe_port->us_info.rx_clock, baud, 16);
+                qe_setbrg(qe_port->us_info.tx_clock, baud, 16);
+        }
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*
+ * Return a pointer to a string that describes what kind of port this is.
+ */
+static const char *qe_uart_type(struct uart_port *port)
+{
+        return "QE";
+}
+
+/*
+ * Allocate any memory and I/O resources required by the port.
+ */
+static int qe_uart_request_port(struct uart_port *port)
+{
+        int ret;
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+        struct ucc_slow_info *us_info = &qe_port->us_info;
+        struct ucc_slow_private *uccs;
+        unsigned int rx_size, tx_size;
+        void *bd_virt;
+        dma_addr_t bd_dma_addr = 0;
+
+        ret = ucc_slow_init(us_info, &uccs);
+        if (ret) {
+                dev_err(port->dev, "could not initialize UCC%u\n",
+                       qe_port->ucc_num);
+                return ret;
+        }
+
+        qe_port->us_private = uccs;
+        qe_port->uccp = uccs->us_regs;
+        qe_port->uccup = (struct ucc_uart_pram *) uccs->us_pram;
+        qe_port->rx_bd_base = uccs->rx_bd;
+        qe_port->tx_bd_base = uccs->tx_bd;
+
+        /*
+         * Allocate the transmit and receive data buffers.
+         */
+
+        rx_size = L1_CACHE_ALIGN(qe_port->rx_nrfifos * qe_port->rx_fifosize);
+        tx_size = L1_CACHE_ALIGN(qe_port->tx_nrfifos * qe_port->tx_fifosize);
+
+        bd_virt = dma_alloc_coherent(port->dev, rx_size + tx_size, &bd_dma_addr,
+                GFP_KERNEL);
+        if (!bd_virt) {
+                dev_err(port->dev, "could not allocate buffer descriptors\n");
+                return -ENOMEM;
+        }
+
+        qe_port->bd_virt = bd_virt;
+        qe_port->bd_dma_addr = bd_dma_addr;
+        qe_port->bd_size = rx_size + tx_size;
+
+        qe_port->rx_buf = bd_virt;
+        qe_port->tx_buf = qe_port->rx_buf + rx_size;
+
+        return 0;
+}
+
+/*
+ * Configure the port.
+ *
+ * We say we're a CPM-type port because that's mostly true.  Once the device
+ * is configured, this driver operates almost identically to the CPM serial
+ * driver.
+ */
+static void qe_uart_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = PORT_CPM;
+                qe_uart_request_port(port);
+        }
+}
+
+/*
+ * Release any memory and I/O resources that were allocated in
+ * qe_uart_request_port().
+ */
+static void qe_uart_release_port(struct uart_port *port)
+{
+        struct uart_qe_port *qe_port =
+                container_of(port, struct uart_qe_port, port);
+        struct ucc_slow_private *uccs = qe_port->us_private;
+
+        dma_free_coherent(port->dev, qe_port->bd_size, qe_port->bd_virt,
+                          qe_port->bd_dma_addr);
+
+        ucc_slow_free(uccs);
+}
+
+/*
+ * Verify that the data in serial_struct is suitable for this device.
+ */
+static int qe_uart_verify_port(struct uart_port *port,
+                               struct serial_struct *ser)
+{
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM)
+                return -EINVAL;
+
+        if (ser->irq < 0 || ser->irq >= nr_irqs)
+                return -EINVAL;
+
+        if (ser->baud_base < 9600)
+                return -EINVAL;
+
+        return 0;
+}
+/* UART operations
+ *
+ * Details on these functions can be found in Documentation/serial/driver
+ */
+static struct uart_ops qe_uart_pops = {
+        .tx_empty       = qe_uart_tx_empty,
+        .set_mctrl      = qe_uart_set_mctrl,
+        .get_mctrl      = qe_uart_get_mctrl,
+        .stop_tx        = qe_uart_stop_tx,
+        .start_tx       = qe_uart_start_tx,
+        .stop_rx        = qe_uart_stop_rx,
+        .enable_ms      = qe_uart_enable_ms,
+        .break_ctl      = qe_uart_break_ctl,
+        .startup        = qe_uart_startup,
+        .shutdown       = qe_uart_shutdown,
+        .set_termios    = qe_uart_set_termios,
+        .type           = qe_uart_type,
+        .release_port   = qe_uart_release_port,
+        .request_port   = qe_uart_request_port,
+        .config_port    = qe_uart_config_port,
+        .verify_port    = qe_uart_verify_port,
+};
+
+/*
+ * Obtain the SOC model number and revision level
+ *
+ * This function parses the device tree to obtain the SOC model.  It then
+ * reads the SVR register to the revision.
+ *
+ * The device tree stores the SOC model two different ways.
+ *
+ * The new way is:
+ *
+ *              cpu@0 {
+ *                      compatible = "PowerPC,8323";
+ *                      device_type = "cpu";
+ *                      ...
+ *
+ *
+ * The old way is:
+ *               PowerPC,8323@0 {
+ *                      device_type = "cpu";
+ *                      ...
+ *
+ * This code first checks the new way, and then the old way.
+ */
+static unsigned int soc_info(unsigned int *rev_h, unsigned int *rev_l)
+{
+        struct device_node *np;
+        const char *soc_string;
+        unsigned int svr;
+        unsigned int soc;
+
+        /* Find the CPU node */
+        np = of_find_node_by_type(NULL, "cpu");
+        if (!np)
+                return 0;
+        /* Find the compatible property */
+        soc_string = of_get_property(np, "compatible", NULL);
+        if (!soc_string)
+                /* No compatible property, so try the name. */
+                soc_string = np->name;
+
+        /* Extract the SOC number from the "PowerPC," string */
+        if ((sscanf(soc_string, "PowerPC,%u", &soc) != 1) || !soc)
+                return 0;
+
+        /* Get the revision from the SVR */
+        svr = mfspr(SPRN_SVR);
+        *rev_h = (svr >> 4) & 0xf;
+        *rev_l = svr & 0xf;
+
+        return soc;
+}
+
+/*
+ * requst_firmware_nowait() callback function
+ *
+ * This function is called by the kernel when a firmware is made available,
+ * or if it times out waiting for the firmware.
+ */
+static void uart_firmware_cont(const struct firmware *fw, void *context)
+{
+        struct qe_firmware *firmware;
+        struct device *dev = context;
+        int ret;
+
+        if (!fw) {
+                dev_err(dev, "firmware not found\n");
+                return;
+        }
+
+        firmware = (struct qe_firmware *) fw->data;
+
+        if (firmware->header.length != fw->size) {
+                dev_err(dev, "invalid firmware\n");
+                goto out;
+        }
+
+        ret = qe_upload_firmware(firmware);
+        if (ret) {
+                dev_err(dev, "could not load firmware\n");
+                goto out;
+        }
+
+        firmware_loaded = 1;
+ out:
+        release_firmware(fw);
+}
+
+static int ucc_uart_probe(struct platform_device *ofdev)
+{
+        struct device_node *np = ofdev->dev.of_node;
+        const unsigned int *iprop;      /* Integer OF properties */
+        const char *sprop;      /* String OF properties */
+        struct uart_qe_port *qe_port = NULL;
+        struct resource res;
+        int ret;
+
+        /*
+         * Determine if we need Soft-UART mode
+         */
+        if (of_find_property(np, "soft-uart", NULL)) {
+                dev_dbg(&ofdev->dev, "using Soft-UART mode\n");
+                soft_uart = 1;
+        }
+
+        /*
+         * If we are using Soft-UART, determine if we need to upload the
+         * firmware, too.
+         */
+        if (soft_uart) {
+                struct qe_firmware_info *qe_fw_info;
+
+                qe_fw_info = qe_get_firmware_info();
+
+                /* Check if the firmware has been uploaded. */
+                if (qe_fw_info && strstr(qe_fw_info->id, "Soft-UART")) {
+                        firmware_loaded = 1;
+                } else {
+                        char filename[32];
+                        unsigned int soc;
+                        unsigned int rev_h;
+                        unsigned int rev_l;
+
+                        soc = soc_info(&rev_h, &rev_l);
+                        if (!soc) {
+                                dev_err(&ofdev->dev, "unknown CPU model\n");
+                                return -ENXIO;
+                        }
+                        sprintf(filename, "fsl_qe_ucode_uart_%u_%u%u.bin",
+                                soc, rev_h, rev_l);
+
+                        dev_info(&ofdev->dev, "waiting for firmware %s\n",
+                                filename);
+
+                        /*
+                         * We call request_firmware_nowait instead of
+                         * request_firmware so that the driver can load and
+                         * initialize the ports without holding up the rest of
+                         * the kernel.  If hotplug support is enabled in the
+                         * kernel, then we use it.
+                         */
+                        ret = request_firmware_nowait(THIS_MODULE,
+                                FW_ACTION_HOTPLUG, filename, &ofdev->dev,
+                                GFP_KERNEL, &ofdev->dev, uart_firmware_cont);
+                        if (ret) {
+                                dev_err(&ofdev->dev,
+                                        "could not load firmware %s\n",
+                                        filename);
+                                return ret;
+                        }
+                }
+        }
+
+        qe_port = kzalloc(sizeof(struct uart_qe_port), GFP_KERNEL);
+        if (!qe_port) {
+                dev_err(&ofdev->dev, "can't allocate QE port structure\n");
+                return -ENOMEM;
+        }
+
+        /* Search for IRQ and mapbase */
+        ret = of_address_to_resource(np, 0, &res);
+        if (ret) {
+                dev_err(&ofdev->dev, "missing 'reg' property in device tree\n");
+                goto out_free;
+        }
+        if (!res.start) {
+                dev_err(&ofdev->dev, "invalid 'reg' property in device tree\n");
+                ret = -EINVAL;
+                goto out_free;
+        }
+        qe_port->port.mapbase = res.start;
+
+        /* Get the UCC number (device ID) */
+        /* UCCs are numbered 1-7 */
+        iprop = of_get_property(np, "cell-index", NULL);
+        if (!iprop) {
+                iprop = of_get_property(np, "device-id", NULL);
+                if (!iprop) {
+                        dev_err(&ofdev->dev, "UCC is unspecified in "
+                                "device tree\n");
+                        ret = -EINVAL;
+                        goto out_free;
+                }
+        }
+
+        if ((*iprop < 1) || (*iprop > UCC_MAX_NUM)) {
+                dev_err(&ofdev->dev, "no support for UCC%u\n", *iprop);
+                ret = -ENODEV;
+                goto out_free;
+        }
+        qe_port->ucc_num = *iprop - 1;
+
+        /*
+         * In the future, we should not require the BRG to be specified in the
+         * device tree.  If no clock-source is specified, then just pick a BRG
+         * to use.  This requires a new QE library function that manages BRG
+         * assignments.
+         */
+
+        sprop = of_get_property(np, "rx-clock-name", NULL);
+        if (!sprop) {
+                dev_err(&ofdev->dev, "missing rx-clock-name in device tree\n");
+                ret = -ENODEV;
+                goto out_free;
+        }
+
+        qe_port->us_info.rx_clock = qe_clock_source(sprop);
+        if ((qe_port->us_info.rx_clock < QE_BRG1) ||
+            (qe_port->us_info.rx_clock > QE_BRG16)) {
+                dev_err(&ofdev->dev, "rx-clock-name must be a BRG for UART\n");
+                ret = -ENODEV;
+                goto out_free;
+        }
+
+#ifdef LOOPBACK
+        /* In internal loopback mode, TX and RX must use the same clock */
+        qe_port->us_info.tx_clock = qe_port->us_info.rx_clock;
+#else
+        sprop = of_get_property(np, "tx-clock-name", NULL);
+        if (!sprop) {
+                dev_err(&ofdev->dev, "missing tx-clock-name in device tree\n");
+                ret = -ENODEV;
+                goto out_free;
+        }
+        qe_port->us_info.tx_clock = qe_clock_source(sprop);
+#endif
+        if ((qe_port->us_info.tx_clock < QE_BRG1) ||
+            (qe_port->us_info.tx_clock > QE_BRG16)) {
+                dev_err(&ofdev->dev, "tx-clock-name must be a BRG for UART\n");
+                ret = -ENODEV;
+                goto out_free;
+        }
+
+        /* Get the port number, numbered 0-3 */
+        iprop = of_get_property(np, "port-number", NULL);
+        if (!iprop) {
+                dev_err(&ofdev->dev, "missing port-number in device tree\n");
+                ret = -EINVAL;
+                goto out_free;
+        }
+        qe_port->port.line = *iprop;
+        if (qe_port->port.line >= UCC_MAX_UART) {
+                dev_err(&ofdev->dev, "port-number must be 0-%u\n",
+                        UCC_MAX_UART - 1);
+                ret = -EINVAL;
+                goto out_free;
+        }
+
+        qe_port->port.irq = irq_of_parse_and_map(np, 0);
+        if (qe_port->port.irq == NO_IRQ) {
+                dev_err(&ofdev->dev, "could not map IRQ for UCC%u\n",
+                       qe_port->ucc_num + 1);
+                ret = -EINVAL;
+                goto out_free;
+        }
+
+        /*
+         * Newer device trees have an "fsl,qe" compatible property for the QE
+         * node, but we still need to support older device trees.
+         */
+        np = of_find_compatible_node(NULL, NULL, "fsl,qe");
+        if (!np) {
+                np = of_find_node_by_type(NULL, "qe");
+                if (!np) {
+                        dev_err(&ofdev->dev, "could not find 'qe' node\n");
+                        ret = -EINVAL;
+                        goto out_free;
+                }
+        }
+
+        iprop = of_get_property(np, "brg-frequency", NULL);
+        if (!iprop) {
+                dev_err(&ofdev->dev,
+                       "missing brg-frequency in device tree\n");
+                ret = -EINVAL;
+                goto out_np;
+        }
+
+        if (*iprop)
+                qe_port->port.uartclk = *iprop;
+        else {
+                /*
+                 * Older versions of U-Boot do not initialize the brg-frequency
+                 * property, so in this case we assume the BRG frequency is
+                 * half the QE bus frequency.
+                 */
+                iprop = of_get_property(np, "bus-frequency", NULL);
+                if (!iprop) {
+                        dev_err(&ofdev->dev,
+                                "missing QE bus-frequency in device tree\n");
+                        ret = -EINVAL;
+                        goto out_np;
+                }
+                if (*iprop)
+                        qe_port->port.uartclk = *iprop / 2;
+                else {
+                        dev_err(&ofdev->dev,
+                                "invalid QE bus-frequency in device tree\n");
+                        ret = -EINVAL;
+                        goto out_np;
+                }
+        }
+
+        spin_lock_init(&qe_port->port.lock);
+        qe_port->np = np;
+        qe_port->port.dev = &ofdev->dev;
+        qe_port->port.ops = &qe_uart_pops;
+        qe_port->port.iotype = UPIO_MEM;
+
+        qe_port->tx_nrfifos = TX_NUM_FIFO;
+        qe_port->tx_fifosize = TX_BUF_SIZE;
+        qe_port->rx_nrfifos = RX_NUM_FIFO;
+        qe_port->rx_fifosize = RX_BUF_SIZE;
+
+        qe_port->wait_closing = UCC_WAIT_CLOSING;
+        qe_port->port.fifosize = 512;
+        qe_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+
+        qe_port->us_info.ucc_num = qe_port->ucc_num;
+        qe_port->us_info.regs = (phys_addr_t) res.start;
+        qe_port->us_info.irq = qe_port->port.irq;
+
+        qe_port->us_info.rx_bd_ring_len = qe_port->rx_nrfifos;
+        qe_port->us_info.tx_bd_ring_len = qe_port->tx_nrfifos;
+
+        /* Make sure ucc_slow_init() initializes both TX and RX */
+        qe_port->us_info.init_tx = 1;
+        qe_port->us_info.init_rx = 1;
+
+        /* Add the port to the uart sub-system.  This will cause
+         * qe_uart_config_port() to be called, so the us_info structure must
+         * be initialized.
+         */
+        ret = uart_add_one_port(&ucc_uart_driver, &qe_port->port);
+        if (ret) {
+                dev_err(&ofdev->dev, "could not add /dev/ttyQE%u\n",
+                       qe_port->port.line);
+                goto out_np;
+        }
+
+        dev_set_drvdata(&ofdev->dev, qe_port);
+
+        dev_info(&ofdev->dev, "UCC%u assigned to /dev/ttyQE%u\n",
+                qe_port->ucc_num + 1, qe_port->port.line);
+
+        /* Display the mknod command for this device */
+        dev_dbg(&ofdev->dev, "mknod command is 'mknod /dev/ttyQE%u c %u %u'\n",
+               qe_port->port.line, SERIAL_QE_MAJOR,
+               SERIAL_QE_MINOR + qe_port->port.line);
+
+        return 0;
+out_np:
+        of_node_put(np);
+out_free:
+        kfree(qe_port);
+        return ret;
+}
+
+static int ucc_uart_remove(struct platform_device *ofdev)
+{
+        struct uart_qe_port *qe_port = dev_get_drvdata(&ofdev->dev);
+
+        dev_info(&ofdev->dev, "removing /dev/ttyQE%u\n", qe_port->port.line);
+
+        uart_remove_one_port(&ucc_uart_driver, &qe_port->port);
+
+        dev_set_drvdata(&ofdev->dev, NULL);
+        kfree(qe_port);
+
+        return 0;
+}
+
+static struct of_device_id ucc_uart_match[] = {
+        {
+                .type = "serial",
+                .compatible = "ucc_uart",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, ucc_uart_match);
+
+static struct platform_driver ucc_uart_of_driver = {
+        .driver = {
+                .name = "ucc_uart",
+                .owner = THIS_MODULE,
+                .of_match_table    = ucc_uart_match,
+        },
+        .probe          = ucc_uart_probe,
+        .remove         = ucc_uart_remove,
+};
+
+static int __init ucc_uart_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO "Freescale QUICC Engine UART device driver\n");
+#ifdef LOOPBACK
+        printk(KERN_INFO "ucc-uart: Using loopback mode\n");
+#endif
+
+        ret = uart_register_driver(&ucc_uart_driver);
+        if (ret) {
+                printk(KERN_ERR "ucc-uart: could not register UART driver\n");
+                return ret;
+        }
+
+        ret = platform_driver_register(&ucc_uart_of_driver);
+        if (ret)
+                printk(KERN_ERR
+                       "ucc-uart: could not register platform driver\n");
+
+        return ret;
+}
+
+static void __exit ucc_uart_exit(void)
+{
+        printk(KERN_INFO
+               "Freescale QUICC Engine UART device driver unloading\n");
+
+        platform_driver_unregister(&ucc_uart_of_driver);
+        uart_unregister_driver(&ucc_uart_driver);
+}
+
+module_init(ucc_uart_init);
+module_exit(ucc_uart_exit);
+
+MODULE_DESCRIPTION("Freescale QUICC Engine (QE) UART");
+MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_QE_MAJOR);
+
diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
new file mode 100644
index 000000000000..3beb6ab4fa68
--- /dev/null
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -0,0 +1,978 @@
+/*
+ *  Driver for NEC VR4100 series Serial Interface Unit.
+ *
+ *  Copyright (C) 2004-2008  Yoichi Yuasa <yuasa@linux-mips.org>
+ *
+ *  Based on drivers/serial/8250.c, by Russell King.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if defined(CONFIG_SERIAL_VR41XX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/console.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+#include <asm/io.h>
+#include <asm/vr41xx/siu.h>
+#include <asm/vr41xx/vr41xx.h>
+
+#define SIU_BAUD_BASE   1152000
+#define SIU_MAJOR       204
+#define SIU_MINOR_BASE  82
+
+#define RX_MAX_COUNT    256
+#define TX_MAX_COUNT    15
+
+#define SIUIRSEL        0x08
+ #define TMICMODE       0x20
+ #define TMICTX         0x10
+ #define IRMSEL         0x0c
+ #define IRMSEL_HP      0x08
+ #define IRMSEL_TEMIC   0x04
+ #define IRMSEL_SHARP   0x00
+ #define IRUSESEL       0x02
+ #define SIRSEL         0x01
+
+static struct uart_port siu_uart_ports[SIU_PORTS_MAX] = {
+        [0 ... SIU_PORTS_MAX-1] = {
+                .lock   = __SPIN_LOCK_UNLOCKED(siu_uart_ports->lock),
+                .irq    = -1,
+        },
+};
+
+#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
+static uint8_t lsr_break_flag[SIU_PORTS_MAX];
+#endif
+
+#define siu_read(port, offset)          readb((port)->membase + (offset))
+#define siu_write(port, offset, value)  writeb((value), (port)->membase + (offset))
+
+void vr41xx_select_siu_interface(siu_interface_t interface)
+{
+        struct uart_port *port;
+        unsigned long flags;
+        uint8_t irsel;
+
+        port = &siu_uart_ports[0];
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        irsel = siu_read(port, SIUIRSEL);
+        if (interface == SIU_INTERFACE_IRDA)
+                irsel |= SIRSEL;
+        else
+                irsel &= ~SIRSEL;
+        siu_write(port, SIUIRSEL, irsel);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL_GPL(vr41xx_select_siu_interface);
+
+void vr41xx_use_irda(irda_use_t use)
+{
+        struct uart_port *port;
+        unsigned long flags;
+        uint8_t irsel;
+
+        port = &siu_uart_ports[0];
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        irsel = siu_read(port, SIUIRSEL);
+        if (use == FIR_USE_IRDA)
+                irsel |= IRUSESEL;
+        else
+                irsel &= ~IRUSESEL;
+        siu_write(port, SIUIRSEL, irsel);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL_GPL(vr41xx_use_irda);
+
+void vr41xx_select_irda_module(irda_module_t module, irda_speed_t speed)
+{
+        struct uart_port *port;
+        unsigned long flags;
+        uint8_t irsel;
+
+        port = &siu_uart_ports[0];
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        irsel = siu_read(port, SIUIRSEL);
+        irsel &= ~(IRMSEL | TMICTX | TMICMODE);
+        switch (module) {
+        case SHARP_IRDA:
+                irsel |= IRMSEL_SHARP;
+                break;
+        case TEMIC_IRDA:
+                irsel |= IRMSEL_TEMIC | TMICMODE;
+                if (speed == IRDA_TX_4MBPS)
+                        irsel |= TMICTX;
+                break;
+        case HP_IRDA:
+                irsel |= IRMSEL_HP;
+                break;
+        default:
+                break;
+        }
+        siu_write(port, SIUIRSEL, irsel);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL_GPL(vr41xx_select_irda_module);
+
+static inline void siu_clear_fifo(struct uart_port *port)
+{
+        siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO);
+        siu_write(port, UART_FCR, UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
+                                  UART_FCR_CLEAR_XMIT);
+        siu_write(port, UART_FCR, 0);
+}
+
+static inline unsigned long siu_port_size(struct uart_port *port)
+{
+        switch (port->type) {
+        case PORT_VR41XX_SIU:
+                return 11UL;
+        case PORT_VR41XX_DSIU:
+                return 8UL;
+        }
+
+        return 0;
+}
+
+static inline unsigned int siu_check_type(struct uart_port *port)
+{
+        if (port->line == 0)
+                return PORT_VR41XX_SIU;
+        if (port->line == 1 && port->irq != -1)
+                return PORT_VR41XX_DSIU;
+
+        return PORT_UNKNOWN;
+}
+
+static inline const char *siu_type_name(struct uart_port *port)
+{
+        switch (port->type) {
+        case PORT_VR41XX_SIU:
+                return "SIU";
+        case PORT_VR41XX_DSIU:
+                return "DSIU";
+        }
+
+        return NULL;
+}
+
+static unsigned int siu_tx_empty(struct uart_port *port)
+{
+        uint8_t lsr;
+
+        lsr = siu_read(port, UART_LSR);
+        if (lsr & UART_LSR_TEMT)
+                return TIOCSER_TEMT;
+
+        return 0;
+}
+
+static void siu_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        uint8_t mcr = 0;
+
+        if (mctrl & TIOCM_DTR)
+                mcr |= UART_MCR_DTR;
+        if (mctrl & TIOCM_RTS)
+                mcr |= UART_MCR_RTS;
+        if (mctrl & TIOCM_OUT1)
+                mcr |= UART_MCR_OUT1;
+        if (mctrl & TIOCM_OUT2)
+                mcr |= UART_MCR_OUT2;
+        if (mctrl & TIOCM_LOOP)
+                mcr |= UART_MCR_LOOP;
+
+        siu_write(port, UART_MCR, mcr);
+}
+
+static unsigned int siu_get_mctrl(struct uart_port *port)
+{
+        uint8_t msr;
+        unsigned int mctrl = 0;
+
+        msr = siu_read(port, UART_MSR);
+        if (msr & UART_MSR_DCD)
+                mctrl |= TIOCM_CAR;
+        if (msr & UART_MSR_RI)
+                mctrl |= TIOCM_RNG;
+        if (msr & UART_MSR_DSR)
+                mctrl |= TIOCM_DSR;
+        if (msr & UART_MSR_CTS)
+                mctrl |= TIOCM_CTS;
+
+        return mctrl;
+}
+
+static void siu_stop_tx(struct uart_port *port)
+{
+        unsigned long flags;
+        uint8_t ier;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        ier = siu_read(port, UART_IER);
+        ier &= ~UART_IER_THRI;
+        siu_write(port, UART_IER, ier);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void siu_start_tx(struct uart_port *port)
+{
+        unsigned long flags;
+        uint8_t ier;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        ier = siu_read(port, UART_IER);
+        ier |= UART_IER_THRI;
+        siu_write(port, UART_IER, ier);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void siu_stop_rx(struct uart_port *port)
+{
+        unsigned long flags;
+        uint8_t ier;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        ier = siu_read(port, UART_IER);
+        ier &= ~UART_IER_RLSI;
+        siu_write(port, UART_IER, ier);
+
+        port->read_status_mask &= ~UART_LSR_DR;
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void siu_enable_ms(struct uart_port *port)
+{
+        unsigned long flags;
+        uint8_t ier;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        ier = siu_read(port, UART_IER);
+        ier |= UART_IER_MSI;
+        siu_write(port, UART_IER, ier);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void siu_break_ctl(struct uart_port *port, int ctl)
+{
+        unsigned long flags;
+        uint8_t lcr;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        lcr = siu_read(port, UART_LCR);
+        if (ctl == -1)
+                lcr |= UART_LCR_SBC;
+        else
+                lcr &= ~UART_LCR_SBC;
+        siu_write(port, UART_LCR, lcr);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static inline void receive_chars(struct uart_port *port, uint8_t *status)
+{
+        struct tty_struct *tty;
+        uint8_t lsr, ch;
+        char flag;
+        int max_count = RX_MAX_COUNT;
+
+        tty = port->state->port.tty;
+        lsr = *status;
+
+        do {
+                ch = siu_read(port, UART_RX);
+                port->icount.rx++;
+                flag = TTY_NORMAL;
+
+#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
+                lsr |= lsr_break_flag[port->line];
+                lsr_break_flag[port->line] = 0;
+#endif
+                if (unlikely(lsr & (UART_LSR_BI | UART_LSR_FE |
+                                    UART_LSR_PE | UART_LSR_OE))) {
+                        if (lsr & UART_LSR_BI) {
+                                lsr &= ~(UART_LSR_FE | UART_LSR_PE);
+                                port->icount.brk++;
+
+                                if (uart_handle_break(port))
+                                        goto ignore_char;
+                        }
+
+                        if (lsr & UART_LSR_FE)
+                                port->icount.frame++;
+                        if (lsr & UART_LSR_PE)
+                                port->icount.parity++;
+                        if (lsr & UART_LSR_OE)
+                                port->icount.overrun++;
+
+                        lsr &= port->read_status_mask;
+                        if (lsr & UART_LSR_BI)
+                                flag = TTY_BREAK;
+                        if (lsr & UART_LSR_FE)
+                                flag = TTY_FRAME;
+                        if (lsr & UART_LSR_PE)
+                                flag = TTY_PARITY;
+                }
+
+                if (uart_handle_sysrq_char(port, ch))
+                        goto ignore_char;
+
+                uart_insert_char(port, lsr, UART_LSR_OE, ch, flag);
+
+        ignore_char:
+                lsr = siu_read(port, UART_LSR);
+        } while ((lsr & UART_LSR_DR) && (max_count-- > 0));
+
+        tty_flip_buffer_push(tty);
+
+        *status = lsr;
+}
+
+static inline void check_modem_status(struct uart_port *port)
+{
+        uint8_t msr;
+
+        msr = siu_read(port, UART_MSR);
+        if ((msr & UART_MSR_ANY_DELTA) == 0)
+                return;
+        if (msr & UART_MSR_DDCD)
+                uart_handle_dcd_change(port, msr & UART_MSR_DCD);
+        if (msr & UART_MSR_TERI)
+                port->icount.rng++;
+        if (msr & UART_MSR_DDSR)
+                port->icount.dsr++;
+        if (msr & UART_MSR_DCTS)
+                uart_handle_cts_change(port, msr & UART_MSR_CTS);
+
+        wake_up_interruptible(&port->state->port.delta_msr_wait);
+}
+
+static inline void transmit_chars(struct uart_port *port)
+{
+        struct circ_buf *xmit;
+        int max_count = TX_MAX_COUNT;
+
+        xmit = &port->state->xmit;
+
+        if (port->x_char) {
+                siu_write(port, UART_TX, port->x_char);
+                port->icount.tx++;
+                port->x_char = 0;
+                return;
+        }
+
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                siu_stop_tx(port);
+                return;
+        }
+
+        do {
+                siu_write(port, UART_TX, xmit->buf[xmit->tail]);
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+                if (uart_circ_empty(xmit))
+                        break;
+        } while (max_count-- > 0);
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                siu_stop_tx(port);
+}
+
+static irqreturn_t siu_interrupt(int irq, void *dev_id)
+{
+        struct uart_port *port;
+        uint8_t iir, lsr;
+
+        port = (struct uart_port *)dev_id;
+
+        iir = siu_read(port, UART_IIR);
+        if (iir & UART_IIR_NO_INT)
+                return IRQ_NONE;
+
+        lsr = siu_read(port, UART_LSR);
+        if (lsr & UART_LSR_DR)
+                receive_chars(port, &lsr);
+
+        check_modem_status(port);
+
+        if (lsr & UART_LSR_THRE)
+                transmit_chars(port);
+
+        return IRQ_HANDLED;
+}
+
+static int siu_startup(struct uart_port *port)
+{
+        int retval;
+
+        if (port->membase == NULL)
+                return -ENODEV;
+
+        siu_clear_fifo(port);
+
+        (void)siu_read(port, UART_LSR);
+        (void)siu_read(port, UART_RX);
+        (void)siu_read(port, UART_IIR);
+        (void)siu_read(port, UART_MSR);
+
+        if (siu_read(port, UART_LSR) == 0xff)
+                return -ENODEV;
+
+        retval = request_irq(port->irq, siu_interrupt, 0, siu_type_name(port), port);
+        if (retval)
+                return retval;
+
+        if (port->type == PORT_VR41XX_DSIU)
+                vr41xx_enable_dsiuint(DSIUINT_ALL);
+
+        siu_write(port, UART_LCR, UART_LCR_WLEN8);
+
+        spin_lock_irq(&port->lock);
+        siu_set_mctrl(port, port->mctrl);
+        spin_unlock_irq(&port->lock);
+
+        siu_write(port, UART_IER, UART_IER_RLSI | UART_IER_RDI);
+
+        (void)siu_read(port, UART_LSR);
+        (void)siu_read(port, UART_RX);
+        (void)siu_read(port, UART_IIR);
+        (void)siu_read(port, UART_MSR);
+
+        return 0;
+}
+
+static void siu_shutdown(struct uart_port *port)
+{
+        unsigned long flags;
+        uint8_t lcr;
+
+        siu_write(port, UART_IER, 0);
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        port->mctrl &= ~TIOCM_OUT2;
+        siu_set_mctrl(port, port->mctrl);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        lcr = siu_read(port, UART_LCR);
+        lcr &= ~UART_LCR_SBC;
+        siu_write(port, UART_LCR, lcr);
+
+        siu_clear_fifo(port);
+
+        (void)siu_read(port, UART_RX);
+
+        if (port->type == PORT_VR41XX_DSIU)
+                vr41xx_disable_dsiuint(DSIUINT_ALL);
+
+        free_irq(port->irq, port);
+}
+
+static void siu_set_termios(struct uart_port *port, struct ktermios *new,
+                            struct ktermios *old)
+{
+        tcflag_t c_cflag, c_iflag;
+        uint8_t lcr, fcr, ier;
+        unsigned int baud, quot;
+        unsigned long flags;
+
+        c_cflag = new->c_cflag;
+        switch (c_cflag & CSIZE) {
+        case CS5:
+                lcr = UART_LCR_WLEN5;
+                break;
+        case CS6:
+                lcr = UART_LCR_WLEN6;
+                break;
+        case CS7:
+                lcr = UART_LCR_WLEN7;
+                break;
+        default:
+                lcr = UART_LCR_WLEN8;
+                break;
+        }
+
+        if (c_cflag & CSTOPB)
+                lcr |= UART_LCR_STOP;
+        if (c_cflag & PARENB)
+                lcr |= UART_LCR_PARITY;
+        if ((c_cflag & PARODD) != PARODD)
+                lcr |= UART_LCR_EPAR;
+        if (c_cflag & CMSPAR)
+                lcr |= UART_LCR_SPAR;
+
+        baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
+        quot = uart_get_divisor(port, baud);
+
+        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        uart_update_timeout(port, c_cflag, baud);
+
+        c_iflag = new->c_iflag;
+
+        port->read_status_mask = UART_LSR_THRE | UART_LSR_OE | UART_LSR_DR;
+        if (c_iflag & INPCK)
+                port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (c_iflag & (BRKINT | PARMRK))
+                port->read_status_mask |= UART_LSR_BI;
+
+        port->ignore_status_mask = 0;
+        if (c_iflag & IGNPAR)
+                port->ignore_status_mask |= UART_LSR_FE | UART_LSR_PE;
+        if (c_iflag & IGNBRK) {
+                port->ignore_status_mask |= UART_LSR_BI;
+                if (c_iflag & IGNPAR)
+                        port->ignore_status_mask |= UART_LSR_OE;
+        }
+
+        if ((c_cflag & CREAD) == 0)
+                port->ignore_status_mask |= UART_LSR_DR;
+
+        ier = siu_read(port, UART_IER);
+        ier &= ~UART_IER_MSI;
+        if (UART_ENABLE_MS(port, c_cflag))
+                ier |= UART_IER_MSI;
+        siu_write(port, UART_IER, ier);
+
+        siu_write(port, UART_LCR, lcr | UART_LCR_DLAB);
+
+        siu_write(port, UART_DLL, (uint8_t)quot);
+        siu_write(port, UART_DLM, (uint8_t)(quot >> 8));
+
+        siu_write(port, UART_LCR, lcr);
+
+        siu_write(port, UART_FCR, fcr);
+
+        siu_set_mctrl(port, port->mctrl);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void siu_pm(struct uart_port *port, unsigned int state, unsigned int oldstate)
+{
+        switch (state) {
+        case 0:
+                switch (port->type) {
+                case PORT_VR41XX_SIU:
+                        vr41xx_supply_clock(SIU_CLOCK);
+                        break;
+                case PORT_VR41XX_DSIU:
+                        vr41xx_supply_clock(DSIU_CLOCK);
+                        break;
+                }
+                break;
+        case 3:
+                switch (port->type) {
+                case PORT_VR41XX_SIU:
+                        vr41xx_mask_clock(SIU_CLOCK);
+                        break;
+                case PORT_VR41XX_DSIU:
+                        vr41xx_mask_clock(DSIU_CLOCK);
+                        break;
+                }
+                break;
+        }
+}
+
+static const char *siu_type(struct uart_port *port)
+{
+        return siu_type_name(port);
+}
+
+static void siu_release_port(struct uart_port *port)
+{
+        unsigned long size;
+
+        if (port->flags & UPF_IOREMAP) {
+                iounmap(port->membase);
+                port->membase = NULL;
+        }
+
+        size = siu_port_size(port);
+        release_mem_region(port->mapbase, size);
+}
+
+static int siu_request_port(struct uart_port *port)
+{
+        unsigned long size;
+        struct resource *res;
+
+        size = siu_port_size(port);
+        res = request_mem_region(port->mapbase, size, siu_type_name(port));
+        if (res == NULL)
+                return -EBUSY;
+
+        if (port->flags & UPF_IOREMAP) {
+                port->membase = ioremap(port->mapbase, size);
+                if (port->membase == NULL) {
+                        release_resource(res);
+                        return -ENOMEM;
+                }
+        }
+
+        return 0;
+}
+
+static void siu_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE) {
+                port->type = siu_check_type(port);
+                (void)siu_request_port(port);
+        }
+}
+
+static int siu_verify_port(struct uart_port *port, struct serial_struct *serial)
+{
+        if (port->type != PORT_VR41XX_SIU && port->type != PORT_VR41XX_DSIU)
+                return -EINVAL;
+        if (port->irq != serial->irq)
+                return -EINVAL;
+        if (port->iotype != serial->io_type)
+                return -EINVAL;
+        if (port->mapbase != (unsigned long)serial->iomem_base)
+                return -EINVAL;
+
+        return 0;
+}
+
+static struct uart_ops siu_uart_ops = {
+        .tx_empty       = siu_tx_empty,
+        .set_mctrl      = siu_set_mctrl,
+        .get_mctrl      = siu_get_mctrl,
+        .stop_tx        = siu_stop_tx,
+        .start_tx       = siu_start_tx,
+        .stop_rx        = siu_stop_rx,
+        .enable_ms      = siu_enable_ms,
+        .break_ctl      = siu_break_ctl,
+        .startup        = siu_startup,
+        .shutdown       = siu_shutdown,
+        .set_termios    = siu_set_termios,
+        .pm             = siu_pm,
+        .type           = siu_type,
+        .release_port   = siu_release_port,
+        .request_port   = siu_request_port,
+        .config_port    = siu_config_port,
+        .verify_port    = siu_verify_port,
+};
+
+static int siu_init_ports(struct platform_device *pdev)
+{
+        struct uart_port *port;
+        struct resource *res;
+        int *type = pdev->dev.platform_data;
+        int i;
+
+        if (!type)
+                return 0;
+
+        port = siu_uart_ports;
+        for (i = 0; i < SIU_PORTS_MAX; i++) {
+                port->type = type[i];
+                if (port->type == PORT_UNKNOWN)
+                        continue;
+                port->irq = platform_get_irq(pdev, i);
+                port->uartclk = SIU_BAUD_BASE * 16;
+                port->fifosize = 16;
+                port->regshift = 0;
+                port->iotype = UPIO_MEM;
+                port->flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
+                port->line = i;
+                res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+                port->mapbase = res->start;
+                port++;
+        }
+
+        return i;
+}
+
+#ifdef CONFIG_SERIAL_VR41XX_CONSOLE
+
+#define BOTH_EMPTY      (UART_LSR_TEMT | UART_LSR_THRE)
+
+static void wait_for_xmitr(struct uart_port *port)
+{
+        int timeout = 10000;
+        uint8_t lsr, msr;
+
+        do {
+                lsr = siu_read(port, UART_LSR);
+                if (lsr & UART_LSR_BI)
+                        lsr_break_flag[port->line] = UART_LSR_BI;
+
+                if ((lsr & BOTH_EMPTY) == BOTH_EMPTY)
+                        break;
+        } while (timeout-- > 0);
+
+        if (port->flags & UPF_CONS_FLOW) {
+                timeout = 1000000;
+
+                do {
+                        msr = siu_read(port, UART_MSR);
+                        if ((msr & UART_MSR_CTS) != 0)
+                                break;
+                } while (timeout-- > 0);
+        }
+}
+
+static void siu_console_putchar(struct uart_port *port, int ch)
+{
+        wait_for_xmitr(port);
+        siu_write(port, UART_TX, ch);
+}
+
+static void siu_console_write(struct console *con, const char *s, unsigned count)
+{
+        struct uart_port *port;
+        uint8_t ier;
+
+        port = &siu_uart_ports[con->index];
+
+        ier = siu_read(port, UART_IER);
+        siu_write(port, UART_IER, 0);
+
+        uart_console_write(port, s, count, siu_console_putchar);
+
+        wait_for_xmitr(port);
+        siu_write(port, UART_IER, ier);
+}
+
+static int __init siu_console_setup(struct console *con, char *options)
+{
+        struct uart_port *port;
+        int baud = 9600;
+        int parity = 'n';
+        int bits = 8;
+        int flow = 'n';
+
+        if (con->index >= SIU_PORTS_MAX)
+                con->index = 0;
+
+        port = &siu_uart_ports[con->index];
+        if (port->membase == NULL) {
+                if (port->mapbase == 0)
+                        return -ENODEV;
+                port->membase = ioremap(port->mapbase, siu_port_size(port));
+        }
+
+        if (port->type == PORT_VR41XX_SIU)
+                vr41xx_select_siu_interface(SIU_INTERFACE_RS232C);
+
+        if (options != NULL)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, con, baud, parity, bits, flow);
+}
+
+static struct uart_driver siu_uart_driver;
+
+static struct console siu_console = {
+        .name   = "ttyVR",
+        .write  = siu_console_write,
+        .device = uart_console_device,
+        .setup  = siu_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+        .data   = &siu_uart_driver,
+};
+
+static int __devinit siu_console_init(void)
+{
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; i < SIU_PORTS_MAX; i++) {
+                port = &siu_uart_ports[i];
+                port->ops = &siu_uart_ops;
+        }
+
+        register_console(&siu_console);
+
+        return 0;
+}
+
+console_initcall(siu_console_init);
+
+void __init vr41xx_siu_early_setup(struct uart_port *port)
+{
+        if (port->type == PORT_UNKNOWN)
+                return;
+
+        siu_uart_ports[port->line].line = port->line;
+        siu_uart_ports[port->line].type = port->type;
+        siu_uart_ports[port->line].uartclk = SIU_BAUD_BASE * 16;
+        siu_uart_ports[port->line].mapbase = port->mapbase;
+        siu_uart_ports[port->line].mapbase = port->mapbase;
+        siu_uart_ports[port->line].ops = &siu_uart_ops;
+}
+
+#define SERIAL_VR41XX_CONSOLE   &siu_console
+#else
+#define SERIAL_VR41XX_CONSOLE   NULL
+#endif
+
+static struct uart_driver siu_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "SIU",
+        .dev_name       = "ttyVR",
+        .major          = SIU_MAJOR,
+        .minor          = SIU_MINOR_BASE,
+        .cons           = SERIAL_VR41XX_CONSOLE,
+};
+
+static int __devinit siu_probe(struct platform_device *dev)
+{
+        struct uart_port *port;
+        int num, i, retval;
+
+        num = siu_init_ports(dev);
+        if (num <= 0)
+                return -ENODEV;
+
+        siu_uart_driver.nr = num;
+        retval = uart_register_driver(&siu_uart_driver);
+        if (retval)
+                return retval;
+
+        for (i = 0; i < num; i++) {
+                port = &siu_uart_ports[i];
+                port->ops = &siu_uart_ops;
+                port->dev = &dev->dev;
+
+                retval = uart_add_one_port(&siu_uart_driver, port);
+                if (retval < 0) {
+                        port->dev = NULL;
+                        break;
+                }
+        }
+
+        if (i == 0 && retval < 0) {
+                uart_unregister_driver(&siu_uart_driver);
+                return retval;
+        }
+
+        return 0;
+}
+
+static int __devexit siu_remove(struct platform_device *dev)
+{
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; i < siu_uart_driver.nr; i++) {
+                port = &siu_uart_ports[i];
+                if (port->dev == &dev->dev) {
+                        uart_remove_one_port(&siu_uart_driver, port);
+                        port->dev = NULL;
+                }
+        }
+
+        uart_unregister_driver(&siu_uart_driver);
+
+        return 0;
+}
+
+static int siu_suspend(struct platform_device *dev, pm_message_t state)
+{
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; i < siu_uart_driver.nr; i++) {
+                port = &siu_uart_ports[i];
+                if ((port->type == PORT_VR41XX_SIU ||
+                     port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
+                        uart_suspend_port(&siu_uart_driver, port);
+
+        }
+
+        return 0;
+}
+
+static int siu_resume(struct platform_device *dev)
+{
+        struct uart_port *port;
+        int i;
+
+        for (i = 0; i < siu_uart_driver.nr; i++) {
+                port = &siu_uart_ports[i];
+                if ((port->type == PORT_VR41XX_SIU ||
+                     port->type == PORT_VR41XX_DSIU) && port->dev == &dev->dev)
+                        uart_resume_port(&siu_uart_driver, port);
+        }
+
+        return 0;
+}
+
+static struct platform_driver siu_device_driver = {
+        .probe          = siu_probe,
+        .remove         = __devexit_p(siu_remove),
+        .suspend        = siu_suspend,
+        .resume         = siu_resume,
+        .driver         = {
+                .name   = "SIU",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init vr41xx_siu_init(void)
+{
+        return platform_driver_register(&siu_device_driver);
+}
+
+static void __exit vr41xx_siu_exit(void)
+{
+        platform_driver_unregister(&siu_device_driver);
+}
+
+module_init(vr41xx_siu_init);
+module_exit(vr41xx_siu_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:SIU");
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
new file mode 100644
index 000000000000..37fc4e3d487c
--- /dev/null
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -0,0 +1,646 @@
+/*
+ * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
+ *
+ * Based on msm_serial.c, which is:
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Robert Love <rlove@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#if defined(CONFIG_SERIAL_VT8500_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+# define SUPPORT_SYSRQ
+#endif
+
+#include <linux/hrtimer.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+
+/*
+ * UART Register offsets
+ */
+
+#define VT8500_URTDR            0x0000  /* Transmit data */
+#define VT8500_URRDR            0x0004  /* Receive data */
+#define VT8500_URDIV            0x0008  /* Clock/Baud rate divisor */
+#define VT8500_URLCR            0x000C  /* Line control */
+#define VT8500_URICR            0x0010  /* IrDA control */
+#define VT8500_URIER            0x0014  /* Interrupt enable */
+#define VT8500_URISR            0x0018  /* Interrupt status */
+#define VT8500_URUSR            0x001c  /* UART status */
+#define VT8500_URFCR            0x0020  /* FIFO control */
+#define VT8500_URFIDX           0x0024  /* FIFO index */
+#define VT8500_URBKR            0x0028  /* Break signal count */
+#define VT8500_URTOD            0x002c  /* Time out divisor */
+#define VT8500_TXFIFO           0x1000  /* Transmit FIFO (16x8) */
+#define VT8500_RXFIFO           0x1020  /* Receive FIFO (16x10) */
+
+/*
+ * Interrupt enable and status bits
+ */
+
+#define TXDE    (1 << 0)        /* Tx Data empty */
+#define RXDF    (1 << 1)        /* Rx Data full */
+#define TXFAE   (1 << 2)        /* Tx FIFO almost empty */
+#define TXFE    (1 << 3)        /* Tx FIFO empty */
+#define RXFAF   (1 << 4)        /* Rx FIFO almost full */
+#define RXFF    (1 << 5)        /* Rx FIFO full */
+#define TXUDR   (1 << 6)        /* Tx underrun */
+#define RXOVER  (1 << 7)        /* Rx overrun */
+#define PER     (1 << 8)        /* Parity error */
+#define FER     (1 << 9)        /* Frame error */
+#define TCTS    (1 << 10)       /* Toggle of CTS */
+#define RXTOUT  (1 << 11)       /* Rx timeout */
+#define BKDONE  (1 << 12)       /* Break signal done */
+#define ERR     (1 << 13)       /* AHB error response */
+
+#define RX_FIFO_INTS    (RXFAF | RXFF | RXOVER | PER | FER | RXTOUT)
+#define TX_FIFO_INTS    (TXFAE | TXFE | TXUDR)
+
+struct vt8500_port {
+        struct uart_port        uart;
+        char                    name[16];
+        struct clk              *clk;
+        unsigned int            ier;
+};
+
+static inline void vt8500_write(struct uart_port *port, unsigned int val,
+                             unsigned int off)
+{
+        writel(val, port->membase + off);
+}
+
+static inline unsigned int vt8500_read(struct uart_port *port, unsigned int off)
+{
+        return readl(port->membase + off);
+}
+
+static void vt8500_stop_tx(struct uart_port *port)
+{
+        struct vt8500_port *vt8500_port = container_of(port,
+                                                       struct vt8500_port,
+                                                       uart);
+
+        vt8500_port->ier &= ~TX_FIFO_INTS;
+        vt8500_write(port, vt8500_port->ier, VT8500_URIER);
+}
+
+static void vt8500_stop_rx(struct uart_port *port)
+{
+        struct vt8500_port *vt8500_port = container_of(port,
+                                                       struct vt8500_port,
+                                                       uart);
+
+        vt8500_port->ier &= ~RX_FIFO_INTS;
+        vt8500_write(port, vt8500_port->ier, VT8500_URIER);
+}
+
+static void vt8500_enable_ms(struct uart_port *port)
+{
+        struct vt8500_port *vt8500_port = container_of(port,
+                                                       struct vt8500_port,
+                                                       uart);
+
+        vt8500_port->ier |= TCTS;
+        vt8500_write(port, vt8500_port->ier, VT8500_URIER);
+}
+
+static void handle_rx(struct uart_port *port)
+{
+        struct tty_struct *tty = tty_port_tty_get(&port->state->port);
+        if (!tty) {
+                /* Discard data: no tty available */
+                int count = (vt8500_read(port, VT8500_URFIDX) & 0x1f00) >> 8;
+                u16 ch;
+                while (count--)
+                        ch = readw(port->membase + VT8500_RXFIFO);
+                return;
+        }
+
+        /*
+         * Handle overrun
+         */
+        if ((vt8500_read(port, VT8500_URISR) & RXOVER)) {
+                port->icount.overrun++;
+                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+        }
+
+        /* and now the main RX loop */
+        while (vt8500_read(port, VT8500_URFIDX) & 0x1f00) {
+                unsigned int c;
+                char flag = TTY_NORMAL;
+
+                c = readw(port->membase + VT8500_RXFIFO) & 0x3ff;
+
+                /* Mask conditions we're ignorning. */
+                c &= ~port->read_status_mask;
+
+                if (c & FER) {
+                        port->icount.frame++;
+                        flag = TTY_FRAME;
+                } else if (c & PER) {
+                        port->icount.parity++;
+                        flag = TTY_PARITY;
+                }
+                port->icount.rx++;
+
+                if (!uart_handle_sysrq_char(port, c))
+                        tty_insert_flip_char(tty, c, flag);
+        }
+
+        tty_flip_buffer_push(tty);
+        tty_kref_put(tty);
+}
+
+static void handle_tx(struct uart_port *port)
+{
+        struct circ_buf *xmit = &port->state->xmit;
+
+        if (port->x_char) {
+                writeb(port->x_char, port->membase + VT8500_TXFIFO);
+                port->icount.tx++;
+                port->x_char = 0;
+        }
+        if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+                vt8500_stop_tx(port);
+                return;
+        }
+
+        while ((vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16) {
+                if (uart_circ_empty(xmit))
+                        break;
+
+                writeb(xmit->buf[xmit->tail], port->membase + VT8500_TXFIFO);
+
+                xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+                port->icount.tx++;
+        }
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+
+        if (uart_circ_empty(xmit))
+                vt8500_stop_tx(port);
+}
+
+static void vt8500_start_tx(struct uart_port *port)
+{
+        struct vt8500_port *vt8500_port = container_of(port,
+                                                       struct vt8500_port,
+                                                       uart);
+
+        vt8500_port->ier &= ~TX_FIFO_INTS;
+        vt8500_write(port, vt8500_port->ier, VT8500_URIER);
+        handle_tx(port);
+        vt8500_port->ier |= TX_FIFO_INTS;
+        vt8500_write(port, vt8500_port->ier, VT8500_URIER);
+}
+
+static void handle_delta_cts(struct uart_port *port)
+{
+        port->icount.cts++;
+        wake_up_interruptible(&port->state->port.delta_msr_wait);
+}
+
+static irqreturn_t vt8500_irq(int irq, void *dev_id)
+{
+        struct uart_port *port = dev_id;
+        unsigned long isr;
+
+        spin_lock(&port->lock);
+        isr = vt8500_read(port, VT8500_URISR);
+
+        /* Acknowledge active status bits */
+        vt8500_write(port, isr, VT8500_URISR);
+
+        if (isr & RX_FIFO_INTS)
+                handle_rx(port);
+        if (isr & TX_FIFO_INTS)
+                handle_tx(port);
+        if (isr & TCTS)
+                handle_delta_cts(port);
+
+        spin_unlock(&port->lock);
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int vt8500_tx_empty(struct uart_port *port)
+{
+        return (vt8500_read(port, VT8500_URFIDX) & 0x1f) < 16 ?
+                                                TIOCSER_TEMT : 0;
+}
+
+static unsigned int vt8500_get_mctrl(struct uart_port *port)
+{
+        unsigned int usr;
+
+        usr = vt8500_read(port, VT8500_URUSR);
+        if (usr & (1 << 4))
+                return TIOCM_CTS;
+        else
+                return 0;
+}
+
+static void vt8500_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+}
+
+static void vt8500_break_ctl(struct uart_port *port, int break_ctl)
+{
+        if (break_ctl)
+                vt8500_write(port, vt8500_read(port, VT8500_URLCR) | (1 << 9),
+                             VT8500_URLCR);
+}
+
+static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud)
+{
+        unsigned long div;
+        unsigned int loops = 1000;
+
+        div = vt8500_read(port, VT8500_URDIV) & ~(0x3ff);
+
+        if (unlikely((baud < 900) || (baud > 921600)))
+                div |= 7;
+        else
+                div |= (921600 / baud) - 1;
+
+        while ((vt8500_read(port, VT8500_URUSR) & (1 << 5)) && --loops)
+                cpu_relax();
+        vt8500_write(port, div, VT8500_URDIV);
+
+        return baud;
+}
+
+static int vt8500_startup(struct uart_port *port)
+{
+        struct vt8500_port *vt8500_port =
+                        container_of(port, struct vt8500_port, uart);
+        int ret;
+
+        snprintf(vt8500_port->name, sizeof(vt8500_port->name),
+                 "vt8500_serial%d", port->line);
+
+        ret = request_irq(port->irq, vt8500_irq, IRQF_TRIGGER_HIGH,
+                          vt8500_port->name, port);
+        if (unlikely(ret))
+                return ret;
+
+        vt8500_write(port, 0x03, VT8500_URLCR); /* enable TX & RX */
+
+        return 0;
+}
+
+static void vt8500_shutdown(struct uart_port *port)
+{
+        struct vt8500_port *vt8500_port =
+                        container_of(port, struct vt8500_port, uart);
+
+        vt8500_port->ier = 0;
+
+        /* disable interrupts and FIFOs */
+        vt8500_write(&vt8500_port->uart, 0, VT8500_URIER);
+        vt8500_write(&vt8500_port->uart, 0x880, VT8500_URFCR);
+        free_irq(port->irq, port);
+}
+
+static void vt8500_set_termios(struct uart_port *port,
+                               struct ktermios *termios,
+                               struct ktermios *old)
+{
+        struct vt8500_port *vt8500_port =
+                        container_of(port, struct vt8500_port, uart);
+        unsigned long flags;
+        unsigned int baud, lcr;
+        unsigned int loops = 1000;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* calculate and set baud rate */
+        baud = uart_get_baud_rate(port, termios, old, 900, 921600);
+        baud = vt8500_set_baud_rate(port, baud);
+        if (tty_termios_baud_rate(termios))
+                tty_termios_encode_baud_rate(termios, baud, baud);
+
+        /* calculate parity */
+        lcr = vt8500_read(&vt8500_port->uart, VT8500_URLCR);
+        lcr &= ~((1 << 5) | (1 << 4));
+        if (termios->c_cflag & PARENB) {
+                lcr |= (1 << 4);
+                termios->c_cflag &= ~CMSPAR;
+                if (termios->c_cflag & PARODD)
+                        lcr |= (1 << 5);
+        }
+
+        /* calculate bits per char */
+        lcr &= ~(1 << 2);
+        switch (termios->c_cflag & CSIZE) {
+        case CS7:
+                break;
+        case CS8:
+        default:
+                lcr |= (1 << 2);
+                termios->c_cflag &= ~CSIZE;
+                termios->c_cflag |= CS8;
+                break;
+        }
+
+        /* calculate stop bits */
+        lcr &= ~(1 << 3);
+        if (termios->c_cflag & CSTOPB)
+                lcr |= (1 << 3);
+
+        /* set parity, bits per char, and stop bit */
+        vt8500_write(&vt8500_port->uart, lcr, VT8500_URLCR);
+
+        /* Configure status bits to ignore based on termio flags. */
+        port->read_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                port->read_status_mask = FER | PER;
+
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /* Reset FIFOs */
+        vt8500_write(&vt8500_port->uart, 0x88c, VT8500_URFCR);
+        while ((vt8500_read(&vt8500_port->uart, VT8500_URFCR) & 0xc)
+                                                        && --loops)
+                cpu_relax();
+
+        /* Every possible FIFO-related interrupt */
+        vt8500_port->ier = RX_FIFO_INTS | TX_FIFO_INTS;
+
+        /*
+         * CTS flow control
+         */
+        if (UART_ENABLE_MS(&vt8500_port->uart, termios->c_cflag))
+                vt8500_port->ier |= TCTS;
+
+        vt8500_write(&vt8500_port->uart, 0x881, VT8500_URFCR);
+        vt8500_write(&vt8500_port->uart, vt8500_port->ier, VT8500_URIER);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static const char *vt8500_type(struct uart_port *port)
+{
+        struct vt8500_port *vt8500_port =
+                        container_of(port, struct vt8500_port, uart);
+        return vt8500_port->name;
+}
+
+static void vt8500_release_port(struct uart_port *port)
+{
+}
+
+static int vt8500_request_port(struct uart_port *port)
+{
+        return 0;
+}
+
+static void vt8500_config_port(struct uart_port *port, int flags)
+{
+        port->type = PORT_VT8500;
+}
+
+static int vt8500_verify_port(struct uart_port *port,
+                              struct serial_struct *ser)
+{
+        if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_VT8500))
+                return -EINVAL;
+        if (unlikely(port->irq != ser->irq))
+                return -EINVAL;
+        return 0;
+}
+
+static struct vt8500_port *vt8500_uart_ports[4];
+static struct uart_driver vt8500_uart_driver;
+
+#ifdef CONFIG_SERIAL_VT8500_CONSOLE
+
+static inline void wait_for_xmitr(struct uart_port *port)
+{
+        unsigned int status, tmout = 10000;
+
+        /* Wait up to 10ms for the character(s) to be sent. */
+        do {
+                status = vt8500_read(port, VT8500_URFIDX);
+
+                if (--tmout == 0)
+                        break;
+                udelay(1);
+        } while (status & 0x10);
+}
+
+static void vt8500_console_putchar(struct uart_port *port, int c)
+{
+        wait_for_xmitr(port);
+        writeb(c, port->membase + VT8500_TXFIFO);
+}
+
+static void vt8500_console_write(struct console *co, const char *s,
+                              unsigned int count)
+{
+        struct vt8500_port *vt8500_port = vt8500_uart_ports[co->index];
+        unsigned long ier;
+
+        BUG_ON(co->index < 0 || co->index >= vt8500_uart_driver.nr);
+
+        ier = vt8500_read(&vt8500_port->uart, VT8500_URIER);
+        vt8500_write(&vt8500_port->uart, VT8500_URIER, 0);
+
+        uart_console_write(&vt8500_port->uart, s, count,
+                           vt8500_console_putchar);
+
+        /*
+         *      Finally, wait for transmitter to become empty
+         *      and switch back to FIFO
+         */
+        wait_for_xmitr(&vt8500_port->uart);
+        vt8500_write(&vt8500_port->uart, VT8500_URIER, ier);
+}
+
+static int __init vt8500_console_setup(struct console *co, char *options)
+{
+        struct vt8500_port *vt8500_port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (unlikely(co->index >= vt8500_uart_driver.nr || co->index < 0))
+                return -ENXIO;
+
+        vt8500_port = vt8500_uart_ports[co->index];
+
+        if (!vt8500_port)
+                return -ENODEV;
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(&vt8500_port->uart,
+                                 co, baud, parity, bits, flow);
+}
+
+static struct console vt8500_console = {
+        .name = "ttyWMT",
+        .write = vt8500_console_write,
+        .device = uart_console_device,
+        .setup = vt8500_console_setup,
+        .flags = CON_PRINTBUFFER,
+        .index = -1,
+        .data = &vt8500_uart_driver,
+};
+
+#define VT8500_CONSOLE  (&vt8500_console)
+
+#else
+#define VT8500_CONSOLE  NULL
+#endif
+
+static struct uart_ops vt8500_uart_pops = {
+        .tx_empty       = vt8500_tx_empty,
+        .set_mctrl      = vt8500_set_mctrl,
+        .get_mctrl      = vt8500_get_mctrl,
+        .stop_tx        = vt8500_stop_tx,
+        .start_tx       = vt8500_start_tx,
+        .stop_rx        = vt8500_stop_rx,
+        .enable_ms      = vt8500_enable_ms,
+        .break_ctl      = vt8500_break_ctl,
+        .startup        = vt8500_startup,
+        .shutdown       = vt8500_shutdown,
+        .set_termios    = vt8500_set_termios,
+        .type           = vt8500_type,
+        .release_port   = vt8500_release_port,
+        .request_port   = vt8500_request_port,
+        .config_port    = vt8500_config_port,
+        .verify_port    = vt8500_verify_port,
+};
+
+static struct uart_driver vt8500_uart_driver = {
+        .owner          = THIS_MODULE,
+        .driver_name    = "vt8500_serial",
+        .dev_name       = "ttyWMT",
+        .nr             = 6,
+        .cons           = VT8500_CONSOLE,
+};
+
+static int __init vt8500_serial_probe(struct platform_device *pdev)
+{
+        struct vt8500_port *vt8500_port;
+        struct resource *mmres, *irqres;
+        int ret;
+
+        mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        irqres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!mmres || !irqres)
+                return -ENODEV;
+
+        vt8500_port = kzalloc(sizeof(struct vt8500_port), GFP_KERNEL);
+        if (!vt8500_port)
+                return -ENOMEM;
+
+        vt8500_port->uart.type = PORT_VT8500;
+        vt8500_port->uart.iotype = UPIO_MEM;
+        vt8500_port->uart.mapbase = mmres->start;
+        vt8500_port->uart.irq = irqres->start;
+        vt8500_port->uart.fifosize = 16;
+        vt8500_port->uart.ops = &vt8500_uart_pops;
+        vt8500_port->uart.line = pdev->id;
+        vt8500_port->uart.dev = &pdev->dev;
+        vt8500_port->uart.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
+        vt8500_port->uart.uartclk = 24000000;
+
+        snprintf(vt8500_port->name, sizeof(vt8500_port->name),
+                 "VT8500 UART%d", pdev->id);
+
+        vt8500_port->uart.membase = ioremap(mmres->start,
+                                            mmres->end - mmres->start + 1);
+        if (!vt8500_port->uart.membase) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        vt8500_uart_ports[pdev->id] = vt8500_port;
+
+        uart_add_one_port(&vt8500_uart_driver, &vt8500_port->uart);
+
+        platform_set_drvdata(pdev, vt8500_port);
+
+        return 0;
+
+err:
+        kfree(vt8500_port);
+        return ret;
+}
+
+static int __devexit vt8500_serial_remove(struct platform_device *pdev)
+{
+        struct vt8500_port *vt8500_port = platform_get_drvdata(pdev);
+
+        platform_set_drvdata(pdev, NULL);
+        uart_remove_one_port(&vt8500_uart_driver, &vt8500_port->uart);
+        kfree(vt8500_port);
+
+        return 0;
+}
+
+static struct platform_driver vt8500_platform_driver = {
+        .probe  = vt8500_serial_probe,
+        .remove = vt8500_serial_remove,
+        .driver = {
+                .name = "vt8500_serial",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init vt8500_serial_init(void)
+{
+        int ret;
+
+        ret = uart_register_driver(&vt8500_uart_driver);
+        if (unlikely(ret))
+                return ret;
+
+        ret = platform_driver_register(&vt8500_platform_driver);
+
+        if (unlikely(ret))
+                uart_unregister_driver(&vt8500_uart_driver);
+
+        return ret;
+}
+
+static void __exit vt8500_serial_exit(void)
+{
+#ifdef CONFIG_SERIAL_VT8500_CONSOLE
+        unregister_console(&vt8500_console);
+#endif
+        platform_driver_unregister(&vt8500_platform_driver);
+        uart_unregister_driver(&vt8500_uart_driver);
+}
+
+module_init(vt8500_serial_init);
+module_exit(vt8500_serial_exit);
+
+MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
+MODULE_DESCRIPTION("Driver for vt8500 serial device");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
new file mode 100644
index 000000000000..19cc1e8149dd
--- /dev/null
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -0,0 +1,1113 @@
+/*
+ * Xilinx PS UART driver
+ *
+ * 2011 (c) Xilinx Inc.
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation;
+ * either version 2 of the License, or (at your option) any
+ * later version.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/serial_core.h>
+#include <linux/console.h>
+#include <linux/serial.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#define XUARTPS_TTY_NAME        "ttyPS"
+#define XUARTPS_NAME            "xuartps"
+#define XUARTPS_MAJOR           0       /* use dynamic node allocation */
+#define XUARTPS_MINOR           0       /* works best with devtmpfs */
+#define XUARTPS_NR_PORTS        2
+#define XUARTPS_FIFO_SIZE       16      /* FIFO size */
+#define XUARTPS_REGISTER_SPACE  0xFFF
+
+#define xuartps_readl(offset)           ioread32(port->membase + offset)
+#define xuartps_writel(val, offset)     iowrite32(val, port->membase + offset)
+
+/********************************Register Map********************************/
+/** UART
+ *
+ * Register offsets for the UART.
+ *
+ */
+#define XUARTPS_CR_OFFSET       0x00  /* Control Register [8:0] */
+#define XUARTPS_MR_OFFSET       0x04  /* Mode Register [10:0] */
+#define XUARTPS_IER_OFFSET      0x08  /* Interrupt Enable [10:0] */
+#define XUARTPS_IDR_OFFSET      0x0C  /* Interrupt Disable [10:0] */
+#define XUARTPS_IMR_OFFSET      0x10  /* Interrupt Mask [10:0] */
+#define XUARTPS_ISR_OFFSET      0x14  /* Interrupt Status [10:0]*/
+#define XUARTPS_BAUDGEN_OFFSET  0x18  /* Baud Rate Generator [15:0] */
+#define XUARTPS_RXTOUT_OFFSET   0x1C  /* RX Timeout [7:0] */
+#define XUARTPS_RXWM_OFFSET     0x20  /* RX FIFO Trigger Level [5:0] */
+#define XUARTPS_MODEMCR_OFFSET  0x24  /* Modem Control [5:0] */
+#define XUARTPS_MODEMSR_OFFSET  0x28  /* Modem Status [8:0] */
+#define XUARTPS_SR_OFFSET       0x2C  /* Channel Status [11:0] */
+#define XUARTPS_FIFO_OFFSET     0x30  /* FIFO [15:0] or [7:0] */
+#define XUARTPS_BAUDDIV_OFFSET  0x34  /* Baud Rate Divider [7:0] */
+#define XUARTPS_FLOWDEL_OFFSET  0x38  /* Flow Delay [15:0] */
+#define XUARTPS_IRRX_PWIDTH_OFFSET 0x3C /* IR Minimum Received Pulse
+                                                Width [15:0] */
+#define XUARTPS_IRTX_PWIDTH_OFFSET 0x40 /* IR Transmitted pulse
+                                                Width [7:0] */
+#define XUARTPS_TXWM_OFFSET     0x44  /* TX FIFO Trigger Level [5:0] */
+
+/** Control Register
+ *
+ * The Control register (CR) controls the major functions of the device.
+ *
+ * Control Register Bit Definitions
+ */
+#define XUARTPS_CR_STOPBRK      0x00000100  /* Stop TX break */
+#define XUARTPS_CR_STARTBRK     0x00000080  /* Set TX break */
+#define XUARTPS_CR_TX_DIS       0x00000020  /* TX disabled. */
+#define XUARTPS_CR_TX_EN        0x00000010  /* TX enabled */
+#define XUARTPS_CR_RX_DIS       0x00000008  /* RX disabled. */
+#define XUARTPS_CR_RX_EN        0x00000004  /* RX enabled */
+#define XUARTPS_CR_TXRST        0x00000002  /* TX logic reset */
+#define XUARTPS_CR_RXRST        0x00000001  /* RX logic reset */
+#define XUARTPS_CR_RST_TO       0x00000040  /* Restart Timeout Counter */
+
+/** Mode Register
+ *
+ * The mode register (MR) defines the mode of transfer as well as the data
+ * format. If this register is modified during transmission or reception,
+ * data validity cannot be guaranteed.
+ *
+ * Mode Register Bit Definitions
+ *
+ */
+#define XUARTPS_MR_CLKSEL               0x00000001  /* Pre-scalar selection */
+#define XUARTPS_MR_CHMODE_L_LOOP        0x00000200  /* Local loop back mode */
+#define XUARTPS_MR_CHMODE_NORM          0x00000000  /* Normal mode */
+
+#define XUARTPS_MR_STOPMODE_2_BIT       0x00000080  /* 2 stop bits */
+#define XUARTPS_MR_STOPMODE_1_BIT       0x00000000  /* 1 stop bit */
+
+#define XUARTPS_MR_PARITY_NONE          0x00000020  /* No parity mode */
+#define XUARTPS_MR_PARITY_MARK          0x00000018  /* Mark parity mode */
+#define XUARTPS_MR_PARITY_SPACE         0x00000010  /* Space parity mode */
+#define XUARTPS_MR_PARITY_ODD           0x00000008  /* Odd parity mode */
+#define XUARTPS_MR_PARITY_EVEN          0x00000000  /* Even parity mode */
+
+#define XUARTPS_MR_CHARLEN_6_BIT        0x00000006  /* 6 bits data */
+#define XUARTPS_MR_CHARLEN_7_BIT        0x00000004  /* 7 bits data */
+#define XUARTPS_MR_CHARLEN_8_BIT        0x00000000  /* 8 bits data */
+
+/** Interrupt Registers
+ *
+ * Interrupt control logic uses the interrupt enable register (IER) and the
+ * interrupt disable register (IDR) to set the value of the bits in the
+ * interrupt mask register (IMR). The IMR determines whether to pass an
+ * interrupt to the interrupt status register (ISR).
+ * Writing a 1 to IER Enables an interrupt, writing a 1 to IDR disables an
+ * interrupt. IMR and ISR are read only, and IER and IDR are write only.
+ * Reading either IER or IDR returns 0x00.
+ *
+ * All four registers have the same bit definitions.
+ */
+#define XUARTPS_IXR_TOUT        0x00000100 /* RX Timeout error interrupt */
+#define XUARTPS_IXR_PARITY      0x00000080 /* Parity error interrupt */
+#define XUARTPS_IXR_FRAMING     0x00000040 /* Framing error interrupt */
+#define XUARTPS_IXR_OVERRUN     0x00000020 /* Overrun error interrupt */
+#define XUARTPS_IXR_TXFULL      0x00000010 /* TX FIFO Full interrupt */
+#define XUARTPS_IXR_TXEMPTY     0x00000008 /* TX FIFO empty interrupt */
+#define XUARTPS_ISR_RXEMPTY     0x00000002 /* RX FIFO empty interrupt */
+#define XUARTPS_IXR_RXTRIG      0x00000001 /* RX FIFO trigger interrupt */
+#define XUARTPS_IXR_RXFULL      0x00000004 /* RX FIFO full interrupt. */
+#define XUARTPS_IXR_RXEMPTY     0x00000002 /* RX FIFO empty interrupt. */
+#define XUARTPS_IXR_MASK        0x00001FFF /* Valid bit mask */
+
+/** Channel Status Register
+ *
+ * The channel status register (CSR) is provided to enable the control logic
+ * to monitor the status of bits in the channel interrupt status register,
+ * even if these are masked out by the interrupt mask register.
+ */
+#define XUARTPS_SR_RXEMPTY      0x00000002 /* RX FIFO empty */
+#define XUARTPS_SR_TXEMPTY      0x00000008 /* TX FIFO empty */
+#define XUARTPS_SR_TXFULL       0x00000010 /* TX FIFO full */
+#define XUARTPS_SR_RXTRIG       0x00000001 /* Rx Trigger */
+
+/**
+ * xuartps_isr - Interrupt handler
+ * @irq: Irq number
+ * @dev_id: Id of the port
+ *
+ * Returns IRQHANDLED
+ **/
+static irqreturn_t xuartps_isr(int irq, void *dev_id)
+{
+        struct uart_port *port = (struct uart_port *)dev_id;
+        struct tty_struct *tty;
+        unsigned long flags;
+        unsigned int isrstatus, numbytes;
+        unsigned int data;
+        char status = TTY_NORMAL;
+
+        /* Get the tty which could be NULL so don't assume it's valid */
+        tty = tty_port_tty_get(&port->state->port);
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Read the interrupt status register to determine which
+         * interrupt(s) is/are active.
+         */
+        isrstatus = xuartps_readl(XUARTPS_ISR_OFFSET);
+
+        /* drop byte with parity error if IGNPAR specified */
+        if (isrstatus & port->ignore_status_mask & XUARTPS_IXR_PARITY)
+                isrstatus &= ~(XUARTPS_IXR_RXTRIG | XUARTPS_IXR_TOUT);
+
+        isrstatus &= port->read_status_mask;
+        isrstatus &= ~port->ignore_status_mask;
+
+        if ((isrstatus & XUARTPS_IXR_TOUT) ||
+                (isrstatus & XUARTPS_IXR_RXTRIG)) {
+                /* Receive Timeout Interrupt */
+                while ((xuartps_readl(XUARTPS_SR_OFFSET) &
+                        XUARTPS_SR_RXEMPTY) != XUARTPS_SR_RXEMPTY) {
+                        data = xuartps_readl(XUARTPS_FIFO_OFFSET);
+                        port->icount.rx++;
+
+                        if (isrstatus & XUARTPS_IXR_PARITY) {
+                                port->icount.parity++;
+                                status = TTY_PARITY;
+                        } else if (isrstatus & XUARTPS_IXR_FRAMING) {
+                                port->icount.frame++;
+                                status = TTY_FRAME;
+                        } else if (isrstatus & XUARTPS_IXR_OVERRUN)
+                                port->icount.overrun++;
+
+                        if (tty)
+                                uart_insert_char(port, isrstatus,
+                                                XUARTPS_IXR_OVERRUN, data,
+                                                status);
+                }
+                spin_unlock(&port->lock);
+                if (tty)
+                        tty_flip_buffer_push(tty);
+                spin_lock(&port->lock);
+        }
+
+        /* Dispatch an appropriate handler */
+        if ((isrstatus & XUARTPS_IXR_TXEMPTY) == XUARTPS_IXR_TXEMPTY) {
+                if (uart_circ_empty(&port->state->xmit)) {
+                        xuartps_writel(XUARTPS_IXR_TXEMPTY,
+                                                XUARTPS_IDR_OFFSET);
+                } else {
+                        numbytes = port->fifosize;
+                        /* Break if no more data available in the UART buffer */
+                        while (numbytes--) {
+                                if (uart_circ_empty(&port->state->xmit))
+                                        break;
+                                /* Get the data from the UART circular buffer
+                                 * and write it to the xuartps's TX_FIFO
+                                 * register.
+                                 */
+                                xuartps_writel(
+                                        port->state->xmit.buf[port->state->xmit.
+                                        tail], XUARTPS_FIFO_OFFSET);
+
+                                port->icount.tx++;
+
+                                /* Adjust the tail of the UART buffer and wrap
+                                 * the buffer if it reaches limit.
+                                 */
+                                port->state->xmit.tail =
+                                        (port->state->xmit.tail + 1) & \
+                                                (UART_XMIT_SIZE - 1);
+                        }
+
+                        if (uart_circ_chars_pending(
+                                        &port->state->xmit) < WAKEUP_CHARS)
+                                uart_write_wakeup(port);
+                }
+        }
+
+        xuartps_writel(isrstatus, XUARTPS_ISR_OFFSET);
+
+        /* be sure to release the lock and tty before leaving */
+        spin_unlock_irqrestore(&port->lock, flags);
+        tty_kref_put(tty);
+
+        return IRQ_HANDLED;
+}
+
+/**
+ * xuartps_set_baud_rate - Calculate and set the baud rate
+ * @port: Handle to the uart port structure
+ * @baud: Baud rate to set
+ *
+ * Returns baud rate, requested baud when possible, or actual baud when there
+ *      was too much error
+ **/
+static unsigned int xuartps_set_baud_rate(struct uart_port *port,
+                                                unsigned int baud)
+{
+        unsigned int sel_clk;
+        unsigned int calc_baud = 0;
+        unsigned int brgr_val, brdiv_val;
+        unsigned int bauderror;
+
+        /* Formula to obtain baud rate is
+         *      baud_tx/rx rate = sel_clk/CD * (BDIV + 1)
+         *      input_clk = (Uart User Defined Clock or Apb Clock)
+         *              depends on UCLKEN in MR Reg
+         *      sel_clk = input_clk or input_clk/8;
+         *              depends on CLKS in MR reg
+         *      CD and BDIV depends on values in
+         *                      baud rate generate register
+         *                      baud rate clock divisor register
+         */
+        sel_clk = port->uartclk;
+        if (xuartps_readl(XUARTPS_MR_OFFSET) & XUARTPS_MR_CLKSEL)
+                sel_clk = sel_clk / 8;
+
+        /* Find the best values for baud generation */
+        for (brdiv_val = 4; brdiv_val < 255; brdiv_val++) {
+
+                brgr_val = sel_clk / (baud * (brdiv_val + 1));
+                if (brgr_val < 2 || brgr_val > 65535)
+                        continue;
+
+                calc_baud = sel_clk / (brgr_val * (brdiv_val + 1));
+
+                if (baud > calc_baud)
+                        bauderror = baud - calc_baud;
+                else
+                        bauderror = calc_baud - baud;
+
+                /* use the values when percent error is acceptable */
+                if (((bauderror * 100) / baud) < 3) {
+                        calc_baud = baud;
+                        break;
+                }
+        }
+
+        /* Set the values for the new baud rate */
+        xuartps_writel(brgr_val, XUARTPS_BAUDGEN_OFFSET);
+        xuartps_writel(brdiv_val, XUARTPS_BAUDDIV_OFFSET);
+
+        return calc_baud;
+}
+
+/*----------------------Uart Operations---------------------------*/
+
+/**
+ * xuartps_start_tx -  Start transmitting bytes
+ * @port: Handle to the uart port structure
+ *
+ **/
+static void xuartps_start_tx(struct uart_port *port)
+{
+        unsigned int status, numbytes = port->fifosize;
+
+        if (uart_circ_empty(&port->state->xmit) || uart_tx_stopped(port))
+                return;
+
+        status = xuartps_readl(XUARTPS_CR_OFFSET);
+        /* Set the TX enable bit and clear the TX disable bit to enable the
+         * transmitter.
+         */
+        xuartps_writel((status & ~XUARTPS_CR_TX_DIS) | XUARTPS_CR_TX_EN,
+                XUARTPS_CR_OFFSET);
+
+        while (numbytes-- && ((xuartps_readl(XUARTPS_SR_OFFSET)
+                & XUARTPS_SR_TXFULL)) != XUARTPS_SR_TXFULL) {
+
+                /* Break if no more data available in the UART buffer */
+                if (uart_circ_empty(&port->state->xmit))
+                        break;
+
+                /* Get the data from the UART circular buffer and
+                 * write it to the xuartps's TX_FIFO register.
+                 */
+                xuartps_writel(
+                        port->state->xmit.buf[port->state->xmit.tail],
+                        XUARTPS_FIFO_OFFSET);
+                port->icount.tx++;
+
+                /* Adjust the tail of the UART buffer and wrap
+                 * the buffer if it reaches limit.
+                 */
+                port->state->xmit.tail = (port->state->xmit.tail + 1) &
+                                        (UART_XMIT_SIZE - 1);
+        }
+
+        /* Enable the TX Empty interrupt */
+        xuartps_writel(XUARTPS_IXR_TXEMPTY, XUARTPS_IER_OFFSET);
+
+        if (uart_circ_chars_pending(&port->state->xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(port);
+}
+
+/**
+ * xuartps_stop_tx - Stop TX
+ * @port: Handle to the uart port structure
+ *
+ **/
+static void xuartps_stop_tx(struct uart_port *port)
+{
+        unsigned int regval;
+
+        regval = xuartps_readl(XUARTPS_CR_OFFSET);
+        regval |= XUARTPS_CR_TX_DIS;
+        /* Disable the transmitter */
+        xuartps_writel(regval, XUARTPS_CR_OFFSET);
+}
+
+/**
+ * xuartps_stop_rx - Stop RX
+ * @port: Handle to the uart port structure
+ *
+ **/
+static void xuartps_stop_rx(struct uart_port *port)
+{
+        unsigned int regval;
+
+        regval = xuartps_readl(XUARTPS_CR_OFFSET);
+        regval |= XUARTPS_CR_RX_DIS;
+        /* Disable the receiver */
+        xuartps_writel(regval, XUARTPS_CR_OFFSET);
+}
+
+/**
+ * xuartps_tx_empty -  Check whether TX is empty
+ * @port: Handle to the uart port structure
+ *
+ * Returns TIOCSER_TEMT on success, 0 otherwise
+ **/
+static unsigned int xuartps_tx_empty(struct uart_port *port)
+{
+        unsigned int status;
+
+        status = xuartps_readl(XUARTPS_ISR_OFFSET) & XUARTPS_IXR_TXEMPTY;
+        return status ? TIOCSER_TEMT : 0;
+}
+
+/**
+ * xuartps_break_ctl - Based on the input ctl we have to start or stop
+ *                      transmitting char breaks
+ * @port: Handle to the uart port structure
+ * @ctl: Value based on which start or stop decision is taken
+ *
+ **/
+static void xuartps_break_ctl(struct uart_port *port, int ctl)
+{
+        unsigned int status;
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        status = xuartps_readl(XUARTPS_CR_OFFSET);
+
+        if (ctl == -1)
+                xuartps_writel(XUARTPS_CR_STARTBRK | status,
+                                        XUARTPS_CR_OFFSET);
+        else {
+                if ((status & XUARTPS_CR_STOPBRK) == 0)
+                        xuartps_writel(XUARTPS_CR_STOPBRK | status,
+                                         XUARTPS_CR_OFFSET);
+        }
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/**
+ * xuartps_set_termios - termios operations, handling data length, parity,
+ *                              stop bits, flow control, baud rate
+ * @port: Handle to the uart port structure
+ * @termios: Handle to the input termios structure
+ * @old: Values of the previously saved termios structure
+ *
+ **/
+static void xuartps_set_termios(struct uart_port *port,
+                                struct ktermios *termios, struct ktermios *old)
+{
+        unsigned int cval = 0;
+        unsigned int baud;
+        unsigned long flags;
+        unsigned int ctrl_reg, mode_reg;
+
+        spin_lock_irqsave(&port->lock, flags);
+
+        /* Empty the receive FIFO 1st before making changes */
+        while ((xuartps_readl(XUARTPS_SR_OFFSET) &
+                 XUARTPS_SR_RXEMPTY) != XUARTPS_SR_RXEMPTY) {
+                xuartps_readl(XUARTPS_FIFO_OFFSET);
+        }
+
+        /* Disable the TX and RX to set baud rate */
+        xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
+                        (XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS),
+                        XUARTPS_CR_OFFSET);
+
+        /* Min baud rate = 6bps and Max Baud Rate is 10Mbps for 100Mhz clk */
+        baud = uart_get_baud_rate(port, termios, old, 0, 10000000);
+        baud = xuartps_set_baud_rate(port, baud);
+        if (tty_termios_baud_rate(termios))
+                tty_termios_encode_baud_rate(termios, baud, baud);
+
+        /*
+         * Update the per-port timeout.
+         */
+        uart_update_timeout(port, termios->c_cflag, baud);
+
+        /* Set TX/RX Reset */
+        xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
+                        (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST),
+                        XUARTPS_CR_OFFSET);
+
+        ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET);
+
+        /* Clear the RX disable and TX disable bits and then set the TX enable
+         * bit and RX enable bit to enable the transmitter and receiver.
+         */
+        xuartps_writel(
+                (ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS))
+                        | (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN),
+                        XUARTPS_CR_OFFSET);
+
+        xuartps_writel(10, XUARTPS_RXTOUT_OFFSET);
+
+        port->read_status_mask = XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_RXTRIG |
+                        XUARTPS_IXR_OVERRUN | XUARTPS_IXR_TOUT;
+        port->ignore_status_mask = 0;
+
+        if (termios->c_iflag & INPCK)
+                port->read_status_mask |= XUARTPS_IXR_PARITY |
+                XUARTPS_IXR_FRAMING;
+
+        if (termios->c_iflag & IGNPAR)
+                port->ignore_status_mask |= XUARTPS_IXR_PARITY |
+                        XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN;
+
+        /* ignore all characters if CREAD is not set */
+        if ((termios->c_cflag & CREAD) == 0)
+                port->ignore_status_mask |= XUARTPS_IXR_RXTRIG |
+                        XUARTPS_IXR_TOUT | XUARTPS_IXR_PARITY |
+                        XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN;
+
+        mode_reg = xuartps_readl(XUARTPS_MR_OFFSET);
+
+        /* Handling Data Size */
+        switch (termios->c_cflag & CSIZE) {
+        case CS6:
+                cval |= XUARTPS_MR_CHARLEN_6_BIT;
+                break;
+        case CS7:
+                cval |= XUARTPS_MR_CHARLEN_7_BIT;
+                break;
+        default:
+        case CS8:
+                cval |= XUARTPS_MR_CHARLEN_8_BIT;
+                termios->c_cflag &= ~CSIZE;
+                termios->c_cflag |= CS8;
+                break;
+        }
+
+        /* Handling Parity and Stop Bits length */
+        if (termios->c_cflag & CSTOPB)
+                cval |= XUARTPS_MR_STOPMODE_2_BIT; /* 2 STOP bits */
+        else
+                cval |= XUARTPS_MR_STOPMODE_1_BIT; /* 1 STOP bit */
+
+        if (termios->c_cflag & PARENB) {
+                /* Mark or Space parity */
+                if (termios->c_cflag & CMSPAR) {
+                        if (termios->c_cflag & PARODD)
+                                cval |= XUARTPS_MR_PARITY_MARK;
+                        else
+                                cval |= XUARTPS_MR_PARITY_SPACE;
+                } else if (termios->c_cflag & PARODD)
+                                cval |= XUARTPS_MR_PARITY_ODD;
+                        else
+                                cval |= XUARTPS_MR_PARITY_EVEN;
+        } else
+                cval |= XUARTPS_MR_PARITY_NONE;
+        xuartps_writel(cval , XUARTPS_MR_OFFSET);
+
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/**
+ * xuartps_startup - Called when an application opens a xuartps port
+ * @port: Handle to the uart port structure
+ *
+ * Returns 0 on success, negative error otherwise
+ **/
+static int xuartps_startup(struct uart_port *port)
+{
+        unsigned int retval = 0, status = 0;
+
+        retval = request_irq(port->irq, xuartps_isr, 0, XUARTPS_NAME,
+                                                                (void *)port);
+        if (retval)
+                return retval;
+
+        /* Disable the TX and RX */
+        xuartps_writel(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS,
+                                                XUARTPS_CR_OFFSET);
+
+        /* Set the Control Register with TX/RX Enable, TX/RX Reset,
+         * no break chars.
+         */
+        xuartps_writel(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST,
+                                XUARTPS_CR_OFFSET);
+
+        status = xuartps_readl(XUARTPS_CR_OFFSET);
+
+        /* Clear the RX disable and TX disable bits and then set the TX enable
+         * bit and RX enable bit to enable the transmitter and receiver.
+         */
+        xuartps_writel((status & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS))
+                        | (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN |
+                        XUARTPS_CR_STOPBRK), XUARTPS_CR_OFFSET);
+
+        /* Set the Mode Register with normal mode,8 data bits,1 stop bit,
+         * no parity.
+         */
+        xuartps_writel(XUARTPS_MR_CHMODE_NORM | XUARTPS_MR_STOPMODE_1_BIT
+                | XUARTPS_MR_PARITY_NONE | XUARTPS_MR_CHARLEN_8_BIT,
+                 XUARTPS_MR_OFFSET);
+
+        /* Set the RX FIFO Trigger level to 14 assuming FIFO size as 16 */
+        xuartps_writel(14, XUARTPS_RXWM_OFFSET);
+
+        /* Receive Timeout register is enabled with value of 10 */
+        xuartps_writel(10, XUARTPS_RXTOUT_OFFSET);
+
+
+        /* Set the Interrupt Registers with desired interrupts */
+        xuartps_writel(XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_PARITY |
+                XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN |
+                XUARTPS_IXR_RXTRIG | XUARTPS_IXR_TOUT, XUARTPS_IER_OFFSET);
+        xuartps_writel(~(XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_PARITY |
+                XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN |
+                XUARTPS_IXR_RXTRIG | XUARTPS_IXR_TOUT), XUARTPS_IDR_OFFSET);
+
+        return retval;
+}
+
+/**
+ * xuartps_shutdown - Called when an application closes a xuartps port
+ * @port: Handle to the uart port structure
+ *
+ **/
+static void xuartps_shutdown(struct uart_port *port)
+{
+        int status;
+
+        /* Disable interrupts */
+        status = xuartps_readl(XUARTPS_IMR_OFFSET);
+        xuartps_writel(status, XUARTPS_IDR_OFFSET);
+
+        /* Disable the TX and RX */
+        xuartps_writel(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS,
+                                 XUARTPS_CR_OFFSET);
+        free_irq(port->irq, port);
+}
+
+/**
+ * xuartps_type - Set UART type to xuartps port
+ * @port: Handle to the uart port structure
+ *
+ * Returns string on success, NULL otherwise
+ **/
+static const char *xuartps_type(struct uart_port *port)
+{
+        return port->type == PORT_XUARTPS ? XUARTPS_NAME : NULL;
+}
+
+/**
+ * xuartps_verify_port - Verify the port params
+ * @port: Handle to the uart port structure
+ * @ser: Handle to the structure whose members are compared
+ *
+ * Returns 0 if success otherwise -EINVAL
+ **/
+static int xuartps_verify_port(struct uart_port *port,
+                                        struct serial_struct *ser)
+{
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_XUARTPS)
+                return -EINVAL;
+        if (port->irq != ser->irq)
+                return -EINVAL;
+        if (ser->io_type != UPIO_MEM)
+                return -EINVAL;
+        if (port->iobase != ser->port)
+                return -EINVAL;
+        if (ser->hub6 != 0)
+                return -EINVAL;
+        return 0;
+}
+
+/**
+ * xuartps_request_port - Claim the memory region attached to xuartps port,
+ *                              called when the driver adds a xuartps port via
+ *                              uart_add_one_port()
+ * @port: Handle to the uart port structure
+ *
+ * Returns 0, -ENOMEM if request fails
+ **/
+static int xuartps_request_port(struct uart_port *port)
+{
+        if (!request_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE,
+                                         XUARTPS_NAME)) {
+                return -ENOMEM;
+        }
+
+        port->membase = ioremap(port->mapbase, XUARTPS_REGISTER_SPACE);
+        if (!port->membase) {
+                dev_err(port->dev, "Unable to map registers\n");
+                release_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE);
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+/**
+ * xuartps_release_port - Release the memory region attached to a xuartps
+ *                              port, called when the driver removes a xuartps
+ *                              port via uart_remove_one_port().
+ * @port: Handle to the uart port structure
+ *
+ **/
+static void xuartps_release_port(struct uart_port *port)
+{
+        release_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE);
+        iounmap(port->membase);
+        port->membase = NULL;
+}
+
+/**
+ * xuartps_config_port - Configure xuartps, called when the driver adds a
+ *                              xuartps port
+ * @port: Handle to the uart port structure
+ * @flags: If any
+ *
+ **/
+static void xuartps_config_port(struct uart_port *port, int flags)
+{
+        if (flags & UART_CONFIG_TYPE && xuartps_request_port(port) == 0)
+                port->type = PORT_XUARTPS;
+}
+
+/**
+ * xuartps_get_mctrl - Get the modem control state
+ *
+ * @port: Handle to the uart port structure
+ *
+ * Returns the modem control state
+ *
+ **/
+static unsigned int xuartps_get_mctrl(struct uart_port *port)
+{
+        return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
+}
+
+static void xuartps_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+        /* N/A */
+}
+
+static void xuartps_enable_ms(struct uart_port *port)
+{
+        /* N/A */
+}
+
+/** The UART operations structure
+ */
+static struct uart_ops xuartps_ops = {
+        .set_mctrl      = xuartps_set_mctrl,
+        .get_mctrl      = xuartps_get_mctrl,
+        .enable_ms      = xuartps_enable_ms,
+
+        .start_tx       = xuartps_start_tx,     /* Start transmitting */
+        .stop_tx        = xuartps_stop_tx,      /* Stop transmission */
+        .stop_rx        = xuartps_stop_rx,      /* Stop reception */
+        .tx_empty       = xuartps_tx_empty,     /* Transmitter busy? */
+        .break_ctl      = xuartps_break_ctl,    /* Start/stop
+                                                 * transmitting break
+                                                 */
+        .set_termios    = xuartps_set_termios,  /* Set termios */
+        .startup        = xuartps_startup,      /* App opens xuartps */
+        .shutdown       = xuartps_shutdown,     /* App closes xuartps */
+        .type           = xuartps_type,         /* Set UART type */
+        .verify_port    = xuartps_verify_port,  /* Verification of port
+                                                 * params
+                                                 */
+        .request_port   = xuartps_request_port, /* Claim resources
+                                                 * associated with a
+                                                 * xuartps port
+                                                 */
+        .release_port   = xuartps_release_port, /* Release resources
+                                                 * associated with a
+                                                 * xuartps port
+                                                 */
+        .config_port    = xuartps_config_port,  /* Configure when driver
+                                                 * adds a xuartps port
+                                                 */
+};
+
+static struct uart_port xuartps_port[2];
+
+/**
+ * xuartps_get_port - Configure the port from the platform device resource
+ *                      info
+ *
+ * Returns a pointer to a uart_port or NULL for failure
+ **/
+static struct uart_port *xuartps_get_port(void)
+{
+        struct uart_port *port;
+        int id;
+
+        /* Find the next unused port */
+        for (id = 0; id < XUARTPS_NR_PORTS; id++)
+                if (xuartps_port[id].mapbase == 0)
+                        break;
+
+        if (id >= XUARTPS_NR_PORTS)
+                return NULL;
+
+        port = &xuartps_port[id];
+
+        /* At this point, we've got an empty uart_port struct, initialize it */
+        spin_lock_init(&port->lock);
+        port->membase   = NULL;
+        port->iobase    = 1; /* mark port in use */
+        port->irq       = 0;
+        port->type      = PORT_UNKNOWN;
+        port->iotype    = UPIO_MEM32;
+        port->flags     = UPF_BOOT_AUTOCONF;
+        port->ops       = &xuartps_ops;
+        port->fifosize  = XUARTPS_FIFO_SIZE;
+        port->line      = id;
+        port->dev       = NULL;
+        return port;
+}
+
+/*-----------------------Console driver operations--------------------------*/
+
+#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
+/**
+ * xuartps_console_wait_tx - Wait for the TX to be full
+ * @port: Handle to the uart port structure
+ *
+ **/
+static void xuartps_console_wait_tx(struct uart_port *port)
+{
+        while ((xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY)
+                                != XUARTPS_SR_TXEMPTY)
+                barrier();
+}
+
+/**
+ * xuartps_console_putchar - write the character to the FIFO buffer
+ * @port: Handle to the uart port structure
+ * @ch: Character to be written
+ *
+ **/
+static void xuartps_console_putchar(struct uart_port *port, int ch)
+{
+        xuartps_console_wait_tx(port);
+        xuartps_writel(ch, XUARTPS_FIFO_OFFSET);
+}
+
+/**
+ * xuartps_console_write - perform write operation
+ * @port: Handle to the uart port structure
+ * @s: Pointer to character array
+ * @count: No of characters
+ **/
+static void xuartps_console_write(struct console *co, const char *s,
+                                unsigned int count)
+{
+        struct uart_port *port = &xuartps_port[co->index];
+        unsigned long flags;
+        unsigned int imr;
+        int locked = 1;
+
+        if (oops_in_progress)
+                locked = spin_trylock_irqsave(&port->lock, flags);
+        else
+                spin_lock_irqsave(&port->lock, flags);
+
+        /* save and disable interrupt */
+        imr = xuartps_readl(XUARTPS_IMR_OFFSET);
+        xuartps_writel(imr, XUARTPS_IDR_OFFSET);
+
+        uart_console_write(port, s, count, xuartps_console_putchar);
+        xuartps_console_wait_tx(port);
+
+        /* restore interrupt state, it seems like there may be a h/w bug
+         * in that the interrupt enable register should not need to be
+         * written based on the data sheet
+         */
+        xuartps_writel(~imr, XUARTPS_IDR_OFFSET);
+        xuartps_writel(imr, XUARTPS_IER_OFFSET);
+
+        if (locked)
+                spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/**
+ * xuartps_console_setup - Initialize the uart to default config
+ * @co: Console handle
+ * @options: Initial settings of uart
+ *
+ * Returns 0, -ENODEV if no device
+ **/
+static int __init xuartps_console_setup(struct console *co, char *options)
+{
+        struct uart_port *port = &xuartps_port[co->index];
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+
+        if (co->index < 0 || co->index >= XUARTPS_NR_PORTS)
+                return -EINVAL;
+
+        if (!port->mapbase) {
+                pr_debug("console on ttyPS%i not present\n", co->index);
+                return -ENODEV;
+        }
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+        return uart_set_options(port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver xuartps_uart_driver;
+
+static struct console xuartps_console = {
+        .name   = XUARTPS_TTY_NAME,
+        .write  = xuartps_console_write,
+        .device = uart_console_device,
+        .setup  = xuartps_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1, /* Specified on the cmdline (e.g. console=ttyPS ) */
+        .data   = &xuartps_uart_driver,
+};
+
+/**
+ * xuartps_console_init - Initialization call
+ *
+ * Returns 0 on success, negative error otherwise
+ **/
+static int __init xuartps_console_init(void)
+{
+        register_console(&xuartps_console);
+        return 0;
+}
+
+console_initcall(xuartps_console_init);
+
+#endif /* CONFIG_SERIAL_XILINX_PS_UART_CONSOLE */
+
+/** Structure Definitions
+ */
+static struct uart_driver xuartps_uart_driver = {
+        .owner          = THIS_MODULE,          /* Owner */
+        .driver_name    = XUARTPS_NAME,         /* Driver name */
+        .dev_name       = XUARTPS_TTY_NAME,     /* Node name */
+        .major          = XUARTPS_MAJOR,        /* Major number */
+        .minor          = XUARTPS_MINOR,        /* Minor number */
+        .nr             = XUARTPS_NR_PORTS,     /* Number of UART ports */
+#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
+        .cons           = &xuartps_console,     /* Console */
+#endif
+};
+
+/* ---------------------------------------------------------------------
+ * Platform bus binding
+ */
+/**
+ * xuartps_probe - Platform driver probe
+ * @pdev: Pointer to the platform device structure
+ *
+ * Returns 0 on success, negative error otherwise
+ **/
+static int __devinit xuartps_probe(struct platform_device *pdev)
+{
+        int rc;
+        struct uart_port *port;
+        struct resource *res, *res2;
+        int clk = 0;
+
+#ifdef CONFIG_OF
+        const unsigned int *prop;
+
+        prop = of_get_property(pdev->dev.of_node, "clock", NULL);
+        if (prop)
+                clk = be32_to_cpup(prop);
+#else
+        clk = *((unsigned int *)(pdev->dev.platform_data));
+#endif
+        if (!clk) {
+                dev_err(&pdev->dev, "no clock specified\n");
+                return -ENODEV;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENODEV;
+
+        res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!res2)
+                return -ENODEV;
+
+        /* Initialize the port structure */
+        port = xuartps_get_port();
+
+        if (!port) {
+                dev_err(&pdev->dev, "Cannot get uart_port structure\n");
+                return -ENODEV;
+        } else {
+                /* Register the port.
+                 * This function also registers this device with the tty layer
+                 * and triggers invocation of the config_port() entry point.
+                 */
+                port->mapbase = res->start;
+                port->irq = res2->start;
+                port->dev = &pdev->dev;
+                port->uartclk = clk;
+                dev_set_drvdata(&pdev->dev, port);
+                rc = uart_add_one_port(&xuartps_uart_driver, port);
+                if (rc) {
+                        dev_err(&pdev->dev,
+                                "uart_add_one_port() failed; err=%i\n", rc);
+                        dev_set_drvdata(&pdev->dev, NULL);
+                        return rc;
+                }
+                return 0;
+        }
+}
+
+/**
+ * xuartps_remove - called when the platform driver is unregistered
+ * @pdev: Pointer to the platform device structure
+ *
+ * Returns 0 on success, negative error otherwise
+ **/
+static int __devexit xuartps_remove(struct platform_device *pdev)
+{
+        struct uart_port *port = dev_get_drvdata(&pdev->dev);
+        int rc = 0;
+
+        /* Remove the xuartps port from the serial core */
+        if (port) {
+                rc = uart_remove_one_port(&xuartps_uart_driver, port);
+                dev_set_drvdata(&pdev->dev, NULL);
+                port->mapbase = 0;
+        }
+        return rc;
+}
+
+/**
+ * xuartps_suspend - suspend event
+ * @pdev: Pointer to the platform device structure
+ * @state: State of the device
+ *
+ * Returns 0
+ **/
+static int xuartps_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        /* Call the API provided in serial_core.c file which handles
+         * the suspend.
+         */
+        uart_suspend_port(&xuartps_uart_driver, &xuartps_port[pdev->id]);
+        return 0;
+}
+
+/**
+ * xuartps_resume - Resume after a previous suspend
+ * @pdev: Pointer to the platform device structure
+ *
+ * Returns 0
+ **/
+static int xuartps_resume(struct platform_device *pdev)
+{
+        uart_resume_port(&xuartps_uart_driver, &xuartps_port[pdev->id]);
+        return 0;
+}
+
+/* Match table for of_platform binding */
+
+#ifdef CONFIG_OF
+static struct of_device_id xuartps_of_match[] __devinitdata = {
+        { .compatible = "xlnx,xuartps", },
+        {}
+};
+MODULE_DEVICE_TABLE(of, xuartps_of_match);
+#else
+#define xuartps_of_match NULL
+#endif
+
+static struct platform_driver xuartps_platform_driver = {
+        .probe   = xuartps_probe,               /* Probe method */
+        .remove  = __exit_p(xuartps_remove),    /* Detach method */
+        .suspend = xuartps_suspend,             /* Suspend */
+        .resume  = xuartps_resume,              /* Resume after a suspend */
+        .driver  = {
+                .owner = THIS_MODULE,
+                .name = XUARTPS_NAME,           /* Driver name */
+                .of_match_table = xuartps_of_match,
+                },
+};
+
+/* ---------------------------------------------------------------------
+ * Module Init and Exit
+ */
+/**
+ * xuartps_init - Initial driver registration call
+ *
+ * Returns whether the registration was successful or not
+ **/
+static int __init xuartps_init(void)
+{
+        int retval = 0;
+
+        /* Register the xuartps driver with the serial core */
+        retval = uart_register_driver(&xuartps_uart_driver);
+        if (retval)
+                return retval;
+
+        /* Register the platform driver */
+        retval = platform_driver_register(&xuartps_platform_driver);
+        if (retval)
+                uart_unregister_driver(&xuartps_uart_driver);
+
+        return retval;
+}
+
+/**
+ * xuartps_exit - Driver unregistration call
+ **/
+static void __exit xuartps_exit(void)
+{
+        /* The order of unregistration is important. Unregister the
+         * UART driver before the platform driver crashes the system.
+         */
+
+        /* Unregister the platform driver */
+        platform_driver_unregister(&xuartps_platform_driver);
+
+        /* Unregister the xuartps driver */
+        uart_unregister_driver(&xuartps_uart_driver);
+}
+
+module_init(xuartps_init);
+module_exit(xuartps_exit);
+
+MODULE_DESCRIPTION("Driver for PS UART");
+MODULE_AUTHOR("Xilinx Inc.");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c
new file mode 100644
index 000000000000..1a7fd3e70315
--- /dev/null
+++ b/drivers/tty/serial/zs.c
@@ -0,0 +1,1304 @@
+/*
+ * zs.c: Serial port driver for IOASIC DECstations.
+ *
+ * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
+ * Derived from drivers/macintosh/macserial.c by Harald Koerfgen.
+ *
+ * DECstation changes
+ * Copyright (C) 1998-2000 Harald Koerfgen
+ * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007  Maciej W. Rozycki
+ *
+ * For the rest of the code the original Copyright applies:
+ * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ *
+ *
+ * Note: for IOASIC systems the wiring is as follows:
+ *
+ * mouse/keyboard:
+ * DIN-7 MJ-4  signal        SCC
+ * 2     1     TxD       <-  A.TxD
+ * 3     4     RxD       ->  A.RxD
+ *
+ * EIA-232/EIA-423:
+ * DB-25 MMJ-6 signal        SCC
+ * 2     2     TxD       <-  B.TxD
+ * 3     5     RxD       ->  B.RxD
+ * 4           RTS       <- ~A.RTS
+ * 5           CTS       -> ~B.CTS
+ * 6     6     DSR       -> ~A.SYNC
+ * 8           CD        -> ~B.DCD
+ * 12          DSRS(DCE) -> ~A.CTS  (*)
+ * 15          TxC       ->  B.TxC
+ * 17          RxC       ->  B.RxC
+ * 20    1     DTR       <- ~A.DTR
+ * 22          RI        -> ~A.DCD
+ * 23          DSRS(DTE) <- ~B.RTS
+ *
+ * (*) EIA-232 defines the signal at this pin to be SCD, while DSRS(DCE)
+ *     is shared with DSRS(DTE) at pin 23.
+ *
+ * As you can immediately notice the wiring of the RTS, DTR and DSR signals
+ * is a bit odd.  This makes the handling of port B unnecessarily
+ * complicated and prevents the use of some automatic modes of operation.
+ */
+
+#if defined(CONFIG_SERIAL_ZS_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/bug.h>
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irqflags.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/spinlock.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/types.h>
+
+#include <asm/atomic.h>
+#include <asm/system.h>
+
+#include <asm/dec/interrupts.h>
+#include <asm/dec/ioasic_addrs.h>
+#include <asm/dec/system.h>
+
+#include "zs.h"
+
+
+MODULE_AUTHOR("Maciej W. Rozycki <macro@linux-mips.org>");
+MODULE_DESCRIPTION("DECstation Z85C30 serial driver");
+MODULE_LICENSE("GPL");
+
+
+static char zs_name[] __initdata = "DECstation Z85C30 serial driver version ";
+static char zs_version[] __initdata = "0.10";
+
+/*
+ * It would be nice to dynamically allocate everything that
+ * depends on ZS_NUM_SCCS, so we could support any number of
+ * Z85C30s, but for now...
+ */
+#define ZS_NUM_SCCS     2               /* Max # of ZS chips supported.  */
+#define ZS_NUM_CHAN     2               /* 2 channels per chip.  */
+#define ZS_CHAN_A       0               /* Index of the channel A.  */
+#define ZS_CHAN_B       1               /* Index of the channel B.  */
+#define ZS_CHAN_IO_SIZE 8               /* IOMEM space size.  */
+#define ZS_CHAN_IO_STRIDE 4             /* Register alignment.  */
+#define ZS_CHAN_IO_OFFSET 1             /* The SCC resides on the high byte
+                                           of the 16-bit IOBUS.  */
+#define ZS_CLOCK        7372800         /* Z85C30 PCLK input clock rate.  */
+
+#define to_zport(uport) container_of(uport, struct zs_port, port)
+
+struct zs_parms {
+        resource_size_t scc[ZS_NUM_SCCS];
+        int irq[ZS_NUM_SCCS];
+};
+
+static struct zs_scc zs_sccs[ZS_NUM_SCCS];
+
+static u8 zs_init_regs[ZS_NUM_REGS] __initdata = {
+        0,                              /* write 0 */
+        PAR_SPEC,                       /* write 1 */
+        0,                              /* write 2 */
+        0,                              /* write 3 */
+        X16CLK | SB1,                   /* write 4 */
+        0,                              /* write 5 */
+        0, 0, 0,                        /* write 6, 7, 8 */
+        MIE | DLC | NV,                 /* write 9 */
+        NRZ,                            /* write 10 */
+        TCBR | RCBR,                    /* write 11 */
+        0, 0,                           /* BRG time constant, write 12 + 13 */
+        BRSRC | BRENABL,                /* write 14 */
+        0,                              /* write 15 */
+};
+
+/*
+ * Debugging.
+ */
+#undef ZS_DEBUG_REGS
+
+
+/*
+ * Reading and writing Z85C30 registers.
+ */
+static void recovery_delay(void)
+{
+        udelay(2);
+}
+
+static u8 read_zsreg(struct zs_port *zport, int reg)
+{
+        void __iomem *control = zport->port.membase + ZS_CHAN_IO_OFFSET;
+        u8 retval;
+
+        if (reg != 0) {
+                writeb(reg & 0xf, control);
+                fast_iob();
+                recovery_delay();
+        }
+        retval = readb(control);
+        recovery_delay();
+        return retval;
+}
+
+static void write_zsreg(struct zs_port *zport, int reg, u8 value)
+{
+        void __iomem *control = zport->port.membase + ZS_CHAN_IO_OFFSET;
+
+        if (reg != 0) {
+                writeb(reg & 0xf, control);
+                fast_iob(); recovery_delay();
+        }
+        writeb(value, control);
+        fast_iob();
+        recovery_delay();
+        return;
+}
+
+static u8 read_zsdata(struct zs_port *zport)
+{
+        void __iomem *data = zport->port.membase +
+                             ZS_CHAN_IO_STRIDE + ZS_CHAN_IO_OFFSET;
+        u8 retval;
+
+        retval = readb(data);
+        recovery_delay();
+        return retval;
+}
+
+static void write_zsdata(struct zs_port *zport, u8 value)
+{
+        void __iomem *data = zport->port.membase +
+                             ZS_CHAN_IO_STRIDE + ZS_CHAN_IO_OFFSET;
+
+        writeb(value, data);
+        fast_iob();
+        recovery_delay();
+        return;
+}
+
+#ifdef ZS_DEBUG_REGS
+void zs_dump(void)
+{
+        struct zs_port *zport;
+        int i, j;
+
+        for (i = 0; i < ZS_NUM_SCCS * ZS_NUM_CHAN; i++) {
+                zport = &zs_sccs[i / ZS_NUM_CHAN].zport[i % ZS_NUM_CHAN];
+
+                if (!zport->scc)
+                        continue;
+
+                for (j = 0; j < 16; j++)
+                        printk("W%-2d = 0x%02x\t", j, zport->regs[j]);
+                printk("\n");
+                for (j = 0; j < 16; j++)
+                        printk("R%-2d = 0x%02x\t", j, read_zsreg(zport, j));
+                printk("\n\n");
+        }
+}
+#endif
+
+
+static void zs_spin_lock_cond_irq(spinlock_t *lock, int irq)
+{
+        if (irq)
+                spin_lock_irq(lock);
+        else
+                spin_lock(lock);
+}
+
+static void zs_spin_unlock_cond_irq(spinlock_t *lock, int irq)
+{
+        if (irq)
+                spin_unlock_irq(lock);
+        else
+                spin_unlock(lock);
+}
+
+static int zs_receive_drain(struct zs_port *zport)
+{
+        int loops = 10000;
+
+        while ((read_zsreg(zport, R0) & Rx_CH_AV) && --loops)
+                read_zsdata(zport);
+        return loops;
+}
+
+static int zs_transmit_drain(struct zs_port *zport, int irq)
+{
+        struct zs_scc *scc = zport->scc;
+        int loops = 10000;
+
+        while (!(read_zsreg(zport, R0) & Tx_BUF_EMP) && --loops) {
+                zs_spin_unlock_cond_irq(&scc->zlock, irq);
+                udelay(2);
+                zs_spin_lock_cond_irq(&scc->zlock, irq);
+        }
+        return loops;
+}
+
+static int zs_line_drain(struct zs_port *zport, int irq)
+{
+        struct zs_scc *scc = zport->scc;
+        int loops = 10000;
+
+        while (!(read_zsreg(zport, R1) & ALL_SNT) && --loops) {
+                zs_spin_unlock_cond_irq(&scc->zlock, irq);
+                udelay(2);
+                zs_spin_lock_cond_irq(&scc->zlock, irq);
+        }
+        return loops;
+}
+
+
+static void load_zsregs(struct zs_port *zport, u8 *regs, int irq)
+{
+        /* Let the current transmission finish.  */
+        zs_line_drain(zport, irq);
+        /* Load 'em up.  */
+        write_zsreg(zport, R3, regs[3] & ~RxENABLE);
+        write_zsreg(zport, R5, regs[5] & ~TxENAB);
+        write_zsreg(zport, R4, regs[4]);
+        write_zsreg(zport, R9, regs[9]);
+        write_zsreg(zport, R1, regs[1]);
+        write_zsreg(zport, R2, regs[2]);
+        write_zsreg(zport, R10, regs[10]);
+        write_zsreg(zport, R14, regs[14] & ~BRENABL);
+        write_zsreg(zport, R11, regs[11]);
+        write_zsreg(zport, R12, regs[12]);
+        write_zsreg(zport, R13, regs[13]);
+        write_zsreg(zport, R14, regs[14]);
+        write_zsreg(zport, R15, regs[15]);
+        if (regs[3] & RxENABLE)
+                write_zsreg(zport, R3, regs[3]);
+        if (regs[5] & TxENAB)
+                write_zsreg(zport, R5, regs[5]);
+        return;
+}
+
+
+/*
+ * Status handling routines.
+ */
+
+/*
+ * zs_tx_empty() -- get the transmitter empty status
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ *          is emptied.  On bus types like RS485, the transmitter must
+ *          release the bus after transmitting.  This must be done when
+ *          the transmit shift register is empty, not be done when the
+ *          transmit holding register is empty.  This functionality
+ *          allows an RS485 driver to be written in user space.
+ */
+static unsigned int zs_tx_empty(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        unsigned long flags;
+        u8 status;
+
+        spin_lock_irqsave(&scc->zlock, flags);
+        status = read_zsreg(zport, R1);
+        spin_unlock_irqrestore(&scc->zlock, flags);
+
+        return status & ALL_SNT ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int zs_raw_get_ab_mctrl(struct zs_port *zport_a,
+                                        struct zs_port *zport_b)
+{
+        u8 status_a, status_b;
+        unsigned int mctrl;
+
+        status_a = read_zsreg(zport_a, R0);
+        status_b = read_zsreg(zport_b, R0);
+
+        mctrl = ((status_b & CTS) ? TIOCM_CTS : 0) |
+                ((status_b & DCD) ? TIOCM_CAR : 0) |
+                ((status_a & DCD) ? TIOCM_RNG : 0) |
+                ((status_a & SYNC_HUNT) ? TIOCM_DSR : 0);
+
+        return mctrl;
+}
+
+static unsigned int zs_raw_get_mctrl(struct zs_port *zport)
+{
+        struct zs_port *zport_a = &zport->scc->zport[ZS_CHAN_A];
+
+        return zport != zport_a ? zs_raw_get_ab_mctrl(zport_a, zport) : 0;
+}
+
+static unsigned int zs_raw_xor_mctrl(struct zs_port *zport)
+{
+        struct zs_port *zport_a = &zport->scc->zport[ZS_CHAN_A];
+        unsigned int mmask, mctrl, delta;
+        u8 mask_a, mask_b;
+
+        if (zport == zport_a)
+                return 0;
+
+        mask_a = zport_a->regs[15];
+        mask_b = zport->regs[15];
+
+        mmask = ((mask_b & CTSIE) ? TIOCM_CTS : 0) |
+                ((mask_b & DCDIE) ? TIOCM_CAR : 0) |
+                ((mask_a & DCDIE) ? TIOCM_RNG : 0) |
+                ((mask_a & SYNCIE) ? TIOCM_DSR : 0);
+
+        mctrl = zport->mctrl;
+        if (mmask) {
+                mctrl &= ~mmask;
+                mctrl |= zs_raw_get_ab_mctrl(zport_a, zport) & mmask;
+        }
+
+        delta = mctrl ^ zport->mctrl;
+        if (delta)
+                zport->mctrl = mctrl;
+
+        return delta;
+}
+
+static unsigned int zs_get_mctrl(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        unsigned int mctrl;
+
+        spin_lock(&scc->zlock);
+        mctrl = zs_raw_get_mctrl(zport);
+        spin_unlock(&scc->zlock);
+
+        return mctrl;
+}
+
+static void zs_set_mctrl(struct uart_port *uport, unsigned int mctrl)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
+        u8 oldloop, newloop;
+
+        spin_lock(&scc->zlock);
+        if (zport != zport_a) {
+                if (mctrl & TIOCM_DTR)
+                        zport_a->regs[5] |= DTR;
+                else
+                        zport_a->regs[5] &= ~DTR;
+                if (mctrl & TIOCM_RTS)
+                        zport_a->regs[5] |= RTS;
+                else
+                        zport_a->regs[5] &= ~RTS;
+                write_zsreg(zport_a, R5, zport_a->regs[5]);
+        }
+
+        /* Rarely modified, so don't poke at hardware unless necessary. */
+        oldloop = zport->regs[14];
+        newloop = oldloop;
+        if (mctrl & TIOCM_LOOP)
+                newloop |= LOOPBAK;
+        else
+                newloop &= ~LOOPBAK;
+        if (newloop != oldloop) {
+                zport->regs[14] = newloop;
+                write_zsreg(zport, R14, zport->regs[14]);
+        }
+        spin_unlock(&scc->zlock);
+}
+
+static void zs_raw_stop_tx(struct zs_port *zport)
+{
+        write_zsreg(zport, R0, RES_Tx_P);
+        zport->tx_stopped = 1;
+}
+
+static void zs_stop_tx(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+
+        spin_lock(&scc->zlock);
+        zs_raw_stop_tx(zport);
+        spin_unlock(&scc->zlock);
+}
+
+static void zs_raw_transmit_chars(struct zs_port *);
+
+static void zs_start_tx(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+
+        spin_lock(&scc->zlock);
+        if (zport->tx_stopped) {
+                zs_transmit_drain(zport, 0);
+                zport->tx_stopped = 0;
+                zs_raw_transmit_chars(zport);
+        }
+        spin_unlock(&scc->zlock);
+}
+
+static void zs_stop_rx(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
+
+        spin_lock(&scc->zlock);
+        zport->regs[15] &= ~BRKIE;
+        zport->regs[1] &= ~(RxINT_MASK | TxINT_ENAB);
+        zport->regs[1] |= RxINT_DISAB;
+
+        if (zport != zport_a) {
+                /* A-side DCD tracks RI and SYNC tracks DSR.  */
+                zport_a->regs[15] &= ~(DCDIE | SYNCIE);
+                write_zsreg(zport_a, R15, zport_a->regs[15]);
+                if (!(zport_a->regs[15] & BRKIE)) {
+                        zport_a->regs[1] &= ~EXT_INT_ENAB;
+                        write_zsreg(zport_a, R1, zport_a->regs[1]);
+                }
+
+                /* This-side DCD tracks DCD and CTS tracks CTS.  */
+                zport->regs[15] &= ~(DCDIE | CTSIE);
+                zport->regs[1] &= ~EXT_INT_ENAB;
+        } else {
+                /* DCD tracks RI and SYNC tracks DSR for the B side.  */
+                if (!(zport->regs[15] & (DCDIE | SYNCIE)))
+                        zport->regs[1] &= ~EXT_INT_ENAB;
+        }
+
+        write_zsreg(zport, R15, zport->regs[15]);
+        write_zsreg(zport, R1, zport->regs[1]);
+        spin_unlock(&scc->zlock);
+}
+
+static void zs_enable_ms(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
+
+        if (zport == zport_a)
+                return;
+
+        spin_lock(&scc->zlock);
+
+        /* Clear Ext interrupts if not being handled already.  */
+        if (!(zport_a->regs[1] & EXT_INT_ENAB))
+                write_zsreg(zport_a, R0, RES_EXT_INT);
+
+        /* A-side DCD tracks RI and SYNC tracks DSR.  */
+        zport_a->regs[1] |= EXT_INT_ENAB;
+        zport_a->regs[15] |= DCDIE | SYNCIE;
+
+        /* This-side DCD tracks DCD and CTS tracks CTS.  */
+        zport->regs[15] |= DCDIE | CTSIE;
+
+        zs_raw_xor_mctrl(zport);
+
+        write_zsreg(zport_a, R1, zport_a->regs[1]);
+        write_zsreg(zport_a, R15, zport_a->regs[15]);
+        write_zsreg(zport, R15, zport->regs[15]);
+        spin_unlock(&scc->zlock);
+}
+
+static void zs_break_ctl(struct uart_port *uport, int break_state)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        unsigned long flags;
+
+        spin_lock_irqsave(&scc->zlock, flags);
+        if (break_state == -1)
+                zport->regs[5] |= SND_BRK;
+        else
+                zport->regs[5] &= ~SND_BRK;
+        write_zsreg(zport, R5, zport->regs[5]);
+        spin_unlock_irqrestore(&scc->zlock, flags);
+}
+
+
+/*
+ * Interrupt handling routines.
+ */
+#define Rx_BRK 0x0100                   /* BREAK event software flag.  */
+#define Rx_SYS 0x0200                   /* SysRq event software flag.  */
+
+static void zs_receive_chars(struct zs_port *zport)
+{
+        struct uart_port *uport = &zport->port;
+        struct zs_scc *scc = zport->scc;
+        struct uart_icount *icount;
+        unsigned int avail, status, ch, flag;
+        int count;
+
+        for (count = 16; count; count--) {
+                spin_lock(&scc->zlock);
+                avail = read_zsreg(zport, R0) & Rx_CH_AV;
+                spin_unlock(&scc->zlock);
+                if (!avail)
+                        break;
+
+                spin_lock(&scc->zlock);
+                status = read_zsreg(zport, R1) & (Rx_OVR | FRM_ERR | PAR_ERR);
+                ch = read_zsdata(zport);
+                spin_unlock(&scc->zlock);
+
+                flag = TTY_NORMAL;
+
+                icount = &uport->icount;
+                icount->rx++;
+
+                /* Handle the null char got when BREAK is removed.  */
+                if (!ch)
+                        status |= zport->tty_break;
+                if (unlikely(status &
+                             (Rx_OVR | FRM_ERR | PAR_ERR | Rx_SYS | Rx_BRK))) {
+                        zport->tty_break = 0;
+
+                        /* Reset the error indication.  */
+                        if (status & (Rx_OVR | FRM_ERR | PAR_ERR)) {
+                                spin_lock(&scc->zlock);
+                                write_zsreg(zport, R0, ERR_RES);
+                                spin_unlock(&scc->zlock);
+                        }
+
+                        if (status & (Rx_SYS | Rx_BRK)) {
+                                icount->brk++;
+                                /* SysRq discards the null char.  */
+                                if (status & Rx_SYS)
+                                        continue;
+                        } else if (status & FRM_ERR)
+                                icount->frame++;
+                        else if (status & PAR_ERR)
+                                icount->parity++;
+                        if (status & Rx_OVR)
+                                icount->overrun++;
+
+                        status &= uport->read_status_mask;
+                        if (status & Rx_BRK)
+                                flag = TTY_BREAK;
+                        else if (status & FRM_ERR)
+                                flag = TTY_FRAME;
+                        else if (status & PAR_ERR)
+                                flag = TTY_PARITY;
+                }
+
+                if (uart_handle_sysrq_char(uport, ch))
+                        continue;
+
+                uart_insert_char(uport, status, Rx_OVR, ch, flag);
+        }
+
+        tty_flip_buffer_push(uport->state->port.tty);
+}
+
+static void zs_raw_transmit_chars(struct zs_port *zport)
+{
+        struct circ_buf *xmit = &zport->port.state->xmit;
+
+        /* XON/XOFF chars.  */
+        if (zport->port.x_char) {
+                write_zsdata(zport, zport->port.x_char);
+                zport->port.icount.tx++;
+                zport->port.x_char = 0;
+                return;
+        }
+
+        /* If nothing to do or stopped or hardware stopped.  */
+        if (uart_circ_empty(xmit) || uart_tx_stopped(&zport->port)) {
+                zs_raw_stop_tx(zport);
+                return;
+        }
+
+        /* Send char.  */
+        write_zsdata(zport, xmit->buf[xmit->tail]);
+        xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+        zport->port.icount.tx++;
+
+        if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+                uart_write_wakeup(&zport->port);
+
+        /* Are we are done?  */
+        if (uart_circ_empty(xmit))
+                zs_raw_stop_tx(zport);
+}
+
+static void zs_transmit_chars(struct zs_port *zport)
+{
+        struct zs_scc *scc = zport->scc;
+
+        spin_lock(&scc->zlock);
+        zs_raw_transmit_chars(zport);
+        spin_unlock(&scc->zlock);
+}
+
+static void zs_status_handle(struct zs_port *zport, struct zs_port *zport_a)
+{
+        struct uart_port *uport = &zport->port;
+        struct zs_scc *scc = zport->scc;
+        unsigned int delta;
+        u8 status, brk;
+
+        spin_lock(&scc->zlock);
+
+        /* Get status from Read Register 0.  */
+        status = read_zsreg(zport, R0);
+
+        if (zport->regs[15] & BRKIE) {
+                brk = status & BRK_ABRT;
+                if (brk && !zport->brk) {
+                        spin_unlock(&scc->zlock);
+                        if (uart_handle_break(uport))
+                                zport->tty_break = Rx_SYS;
+                        else
+                                zport->tty_break = Rx_BRK;
+                        spin_lock(&scc->zlock);
+                }
+                zport->brk = brk;
+        }
+
+        if (zport != zport_a) {
+                delta = zs_raw_xor_mctrl(zport);
+                spin_unlock(&scc->zlock);
+
+                if (delta & TIOCM_CTS)
+                        uart_handle_cts_change(uport,
+                                               zport->mctrl & TIOCM_CTS);
+                if (delta & TIOCM_CAR)
+                        uart_handle_dcd_change(uport,
+                                               zport->mctrl & TIOCM_CAR);
+                if (delta & TIOCM_RNG)
+                        uport->icount.dsr++;
+                if (delta & TIOCM_DSR)
+                        uport->icount.rng++;
+
+                if (delta)
+                        wake_up_interruptible(&uport->state->port.delta_msr_wait);
+
+                spin_lock(&scc->zlock);
+        }
+
+        /* Clear the status condition...  */
+        write_zsreg(zport, R0, RES_EXT_INT);
+
+        spin_unlock(&scc->zlock);
+}
+
+/*
+ * This is the Z85C30 driver's generic interrupt routine.
+ */
+static irqreturn_t zs_interrupt(int irq, void *dev_id)
+{
+        struct zs_scc *scc = dev_id;
+        struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
+        struct zs_port *zport_b = &scc->zport[ZS_CHAN_B];
+        irqreturn_t status = IRQ_NONE;
+        u8 zs_intreg;
+        int count;
+
+        /*
+         * NOTE: The read register 3, which holds the irq status,
+         *       does so for both channels on each chip.  Although
+         *       the status value itself must be read from the A
+         *       channel and is only valid when read from channel A.
+         *       Yes... broken hardware...
+         */
+        for (count = 16; count; count--) {
+                spin_lock(&scc->zlock);
+                zs_intreg = read_zsreg(zport_a, R3);
+                spin_unlock(&scc->zlock);
+                if (!zs_intreg)
+                        break;
+
+                /*
+                 * We do not like losing characters, so we prioritise
+                 * interrupt sources a little bit differently than
+                 * the SCC would, was it allowed to.
+                 */
+                if (zs_intreg & CHBRxIP)
+                        zs_receive_chars(zport_b);
+                if (zs_intreg & CHARxIP)
+                        zs_receive_chars(zport_a);
+                if (zs_intreg & CHBEXT)
+                        zs_status_handle(zport_b, zport_a);
+                if (zs_intreg & CHAEXT)
+                        zs_status_handle(zport_a, zport_a);
+                if (zs_intreg & CHBTxIP)
+                        zs_transmit_chars(zport_b);
+                if (zs_intreg & CHATxIP)
+                        zs_transmit_chars(zport_a);
+
+                status = IRQ_HANDLED;
+        }
+
+        return status;
+}
+
+
+/*
+ * Finally, routines used to initialize the serial port.
+ */
+static int zs_startup(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        unsigned long flags;
+        int irq_guard;
+        int ret;
+
+        irq_guard = atomic_add_return(1, &scc->irq_guard);
+        if (irq_guard == 1) {
+                ret = request_irq(zport->port.irq, zs_interrupt,
+                                  IRQF_SHARED, "scc", scc);
+                if (ret) {
+                        atomic_add(-1, &scc->irq_guard);
+                        printk(KERN_ERR "zs: can't get irq %d\n",
+                               zport->port.irq);
+                        return ret;
+                }
+        }
+
+        spin_lock_irqsave(&scc->zlock, flags);
+
+        /* Clear the receive FIFO.  */
+        zs_receive_drain(zport);
+
+        /* Clear the interrupt registers.  */
+        write_zsreg(zport, R0, ERR_RES);
+        write_zsreg(zport, R0, RES_Tx_P);
+        /* But Ext only if not being handled already.  */
+        if (!(zport->regs[1] & EXT_INT_ENAB))
+                write_zsreg(zport, R0, RES_EXT_INT);
+
+        /* Finally, enable sequencing and interrupts.  */
+        zport->regs[1] &= ~RxINT_MASK;
+        zport->regs[1] |= RxINT_ALL | TxINT_ENAB | EXT_INT_ENAB;
+        zport->regs[3] |= RxENABLE;
+        zport->regs[15] |= BRKIE;
+        write_zsreg(zport, R1, zport->regs[1]);
+        write_zsreg(zport, R3, zport->regs[3]);
+        write_zsreg(zport, R5, zport->regs[5]);
+        write_zsreg(zport, R15, zport->regs[15]);
+
+        /* Record the current state of RR0.  */
+        zport->mctrl = zs_raw_get_mctrl(zport);
+        zport->brk = read_zsreg(zport, R0) & BRK_ABRT;
+
+        zport->tx_stopped = 1;
+
+        spin_unlock_irqrestore(&scc->zlock, flags);
+
+        return 0;
+}
+
+static void zs_shutdown(struct uart_port *uport)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        unsigned long flags;
+        int irq_guard;
+
+        spin_lock_irqsave(&scc->zlock, flags);
+
+        zport->regs[3] &= ~RxENABLE;
+        write_zsreg(zport, R5, zport->regs[5]);
+        write_zsreg(zport, R3, zport->regs[3]);
+
+        spin_unlock_irqrestore(&scc->zlock, flags);
+
+        irq_guard = atomic_add_return(-1, &scc->irq_guard);
+        if (!irq_guard)
+                free_irq(zport->port.irq, scc);
+}
+
+
+static void zs_reset(struct zs_port *zport)
+{
+        struct zs_scc *scc = zport->scc;
+        int irq;
+        unsigned long flags;
+
+        spin_lock_irqsave(&scc->zlock, flags);
+        irq = !irqs_disabled_flags(flags);
+        if (!scc->initialised) {
+                /* Reset the pointer first, just in case...  */
+                read_zsreg(zport, R0);
+                /* And let the current transmission finish.  */
+                zs_line_drain(zport, irq);
+                write_zsreg(zport, R9, FHWRES);
+                udelay(10);
+                write_zsreg(zport, R9, 0);
+                scc->initialised = 1;
+        }
+        load_zsregs(zport, zport->regs, irq);
+        spin_unlock_irqrestore(&scc->zlock, flags);
+}
+
+static void zs_set_termios(struct uart_port *uport, struct ktermios *termios,
+                           struct ktermios *old_termios)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        struct zs_port *zport_a = &scc->zport[ZS_CHAN_A];
+        int irq;
+        unsigned int baud, brg;
+        unsigned long flags;
+
+        spin_lock_irqsave(&scc->zlock, flags);
+        irq = !irqs_disabled_flags(flags);
+
+        /* Byte size.  */
+        zport->regs[3] &= ~RxNBITS_MASK;
+        zport->regs[5] &= ~TxNBITS_MASK;
+        switch (termios->c_cflag & CSIZE) {
+        case CS5:
+                zport->regs[3] |= Rx5;
+                zport->regs[5] |= Tx5;
+                break;
+        case CS6:
+                zport->regs[3] |= Rx6;
+                zport->regs[5] |= Tx6;
+                break;
+        case CS7:
+                zport->regs[3] |= Rx7;
+                zport->regs[5] |= Tx7;
+                break;
+        case CS8:
+        default:
+                zport->regs[3] |= Rx8;
+                zport->regs[5] |= Tx8;
+                break;
+        }
+
+        /* Parity and stop bits.  */
+        zport->regs[4] &= ~(XCLK_MASK | SB_MASK | PAR_ENA | PAR_EVEN);
+        if (termios->c_cflag & CSTOPB)
+                zport->regs[4] |= SB2;
+        else
+                zport->regs[4] |= SB1;
+        if (termios->c_cflag & PARENB)
+                zport->regs[4] |= PAR_ENA;
+        if (!(termios->c_cflag & PARODD))
+                zport->regs[4] |= PAR_EVEN;
+        switch (zport->clk_mode) {
+        case 64:
+                zport->regs[4] |= X64CLK;
+                break;
+        case 32:
+                zport->regs[4] |= X32CLK;
+                break;
+        case 16:
+                zport->regs[4] |= X16CLK;
+                break;
+        case 1:
+                zport->regs[4] |= X1CLK;
+                break;
+        default:
+                BUG();
+        }
+
+        baud = uart_get_baud_rate(uport, termios, old_termios, 0,
+                                  uport->uartclk / zport->clk_mode / 4);
+
+        brg = ZS_BPS_TO_BRG(baud, uport->uartclk / zport->clk_mode);
+        zport->regs[12] = brg & 0xff;
+        zport->regs[13] = (brg >> 8) & 0xff;
+
+        uart_update_timeout(uport, termios->c_cflag, baud);
+
+        uport->read_status_mask = Rx_OVR;
+        if (termios->c_iflag & INPCK)
+                uport->read_status_mask |= FRM_ERR | PAR_ERR;
+        if (termios->c_iflag & (BRKINT | PARMRK))
+                uport->read_status_mask |= Rx_BRK;
+
+        uport->ignore_status_mask = 0;
+        if (termios->c_iflag & IGNPAR)
+                uport->ignore_status_mask |= FRM_ERR | PAR_ERR;
+        if (termios->c_iflag & IGNBRK) {
+                uport->ignore_status_mask |= Rx_BRK;
+                if (termios->c_iflag & IGNPAR)
+                        uport->ignore_status_mask |= Rx_OVR;
+        }
+
+        if (termios->c_cflag & CREAD)
+                zport->regs[3] |= RxENABLE;
+        else
+                zport->regs[3] &= ~RxENABLE;
+
+        if (zport != zport_a) {
+                if (!(termios->c_cflag & CLOCAL)) {
+                        zport->regs[15] |= DCDIE;
+                } else
+                        zport->regs[15] &= ~DCDIE;
+                if (termios->c_cflag & CRTSCTS) {
+                        zport->regs[15] |= CTSIE;
+                } else
+                        zport->regs[15] &= ~CTSIE;
+                zs_raw_xor_mctrl(zport);
+        }
+
+        /* Load up the new values.  */
+        load_zsregs(zport, zport->regs, irq);
+
+        spin_unlock_irqrestore(&scc->zlock, flags);
+}
+
+/*
+ * Hack alert!
+ * Required solely so that the initial PROM-based console
+ * works undisturbed in parallel with this one.
+ */
+static void zs_pm(struct uart_port *uport, unsigned int state,
+                  unsigned int oldstate)
+{
+        struct zs_port *zport = to_zport(uport);
+
+        if (state < 3)
+                zport->regs[5] |= TxENAB;
+        else
+                zport->regs[5] &= ~TxENAB;
+        write_zsreg(zport, R5, zport->regs[5]);
+}
+
+
+static const char *zs_type(struct uart_port *uport)
+{
+        return "Z85C30 SCC";
+}
+
+static void zs_release_port(struct uart_port *uport)
+{
+        iounmap(uport->membase);
+        uport->membase = 0;
+        release_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE);
+}
+
+static int zs_map_port(struct uart_port *uport)
+{
+        if (!uport->membase)
+                uport->membase = ioremap_nocache(uport->mapbase,
+                                                 ZS_CHAN_IO_SIZE);
+        if (!uport->membase) {
+                printk(KERN_ERR "zs: Cannot map MMIO\n");
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static int zs_request_port(struct uart_port *uport)
+{
+        int ret;
+
+        if (!request_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE, "scc")) {
+                printk(KERN_ERR "zs: Unable to reserve MMIO resource\n");
+                return -EBUSY;
+        }
+        ret = zs_map_port(uport);
+        if (ret) {
+                release_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE);
+                return ret;
+        }
+        return 0;
+}
+
+static void zs_config_port(struct uart_port *uport, int flags)
+{
+        struct zs_port *zport = to_zport(uport);
+
+        if (flags & UART_CONFIG_TYPE) {
+                if (zs_request_port(uport))
+                        return;
+
+                uport->type = PORT_ZS;
+
+                zs_reset(zport);
+        }
+}
+
+static int zs_verify_port(struct uart_port *uport, struct serial_struct *ser)
+{
+        struct zs_port *zport = to_zport(uport);
+        int ret = 0;
+
+        if (ser->type != PORT_UNKNOWN && ser->type != PORT_ZS)
+                ret = -EINVAL;
+        if (ser->irq != uport->irq)
+                ret = -EINVAL;
+        if (ser->baud_base != uport->uartclk / zport->clk_mode / 4)
+                ret = -EINVAL;
+        return ret;
+}
+
+
+static struct uart_ops zs_ops = {
+        .tx_empty       = zs_tx_empty,
+        .set_mctrl      = zs_set_mctrl,
+        .get_mctrl      = zs_get_mctrl,
+        .stop_tx        = zs_stop_tx,
+        .start_tx       = zs_start_tx,
+        .stop_rx        = zs_stop_rx,
+        .enable_ms      = zs_enable_ms,
+        .break_ctl      = zs_break_ctl,
+        .startup        = zs_startup,
+        .shutdown       = zs_shutdown,
+        .set_termios    = zs_set_termios,
+        .pm             = zs_pm,
+        .type           = zs_type,
+        .release_port   = zs_release_port,
+        .request_port   = zs_request_port,
+        .config_port    = zs_config_port,
+        .verify_port    = zs_verify_port,
+};
+
+/*
+ * Initialize Z85C30 port structures.
+ */
+static int __init zs_probe_sccs(void)
+{
+        static int probed;
+        struct zs_parms zs_parms;
+        int chip, side, irq;
+        int n_chips = 0;
+        int i;
+
+        if (probed)
+                return 0;
+
+        irq = dec_interrupt[DEC_IRQ_SCC0];
+        if (irq >= 0) {
+                zs_parms.scc[n_chips] = IOASIC_SCC0;
+                zs_parms.irq[n_chips] = dec_interrupt[DEC_IRQ_SCC0];
+                n_chips++;
+        }
+        irq = dec_interrupt[DEC_IRQ_SCC1];
+        if (irq >= 0) {
+                zs_parms.scc[n_chips] = IOASIC_SCC1;
+                zs_parms.irq[n_chips] = dec_interrupt[DEC_IRQ_SCC1];
+                n_chips++;
+        }
+        if (!n_chips)
+                return -ENXIO;
+
+        probed = 1;
+
+        for (chip = 0; chip < n_chips; chip++) {
+                spin_lock_init(&zs_sccs[chip].zlock);
+                for (side = 0; side < ZS_NUM_CHAN; side++) {
+                        struct zs_port *zport = &zs_sccs[chip].zport[side];
+                        struct uart_port *uport = &zport->port;
+
+                        zport->scc      = &zs_sccs[chip];
+                        zport->clk_mode = 16;
+
+                        uport->irq      = zs_parms.irq[chip];
+                        uport->uartclk  = ZS_CLOCK;
+                        uport->fifosize = 1;
+                        uport->iotype   = UPIO_MEM;
+                        uport->flags    = UPF_BOOT_AUTOCONF;
+                        uport->ops      = &zs_ops;
+                        uport->line     = chip * ZS_NUM_CHAN + side;
+                        uport->mapbase  = dec_kn_slot_base +
+                                          zs_parms.scc[chip] +
+                                          (side ^ ZS_CHAN_B) * ZS_CHAN_IO_SIZE;
+
+                        for (i = 0; i < ZS_NUM_REGS; i++)
+                                zport->regs[i] = zs_init_regs[i];
+                }
+        }
+
+        return 0;
+}
+
+
+#ifdef CONFIG_SERIAL_ZS_CONSOLE
+static void zs_console_putchar(struct uart_port *uport, int ch)
+{
+        struct zs_port *zport = to_zport(uport);
+        struct zs_scc *scc = zport->scc;
+        int irq;
+        unsigned long flags;
+
+        spin_lock_irqsave(&scc->zlock, flags);
+        irq = !irqs_disabled_flags(flags);
+        if (zs_transmit_drain(zport, irq))
+                write_zsdata(zport, ch);
+        spin_unlock_irqrestore(&scc->zlock, flags);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ */
+static void zs_console_write(struct console *co, const char *s,
+                             unsigned int count)
+{
+        int chip = co->index / ZS_NUM_CHAN, side = co->index % ZS_NUM_CHAN;
+        struct zs_port *zport = &zs_sccs[chip].zport[side];
+        struct zs_scc *scc = zport->scc;
+        unsigned long flags;
+        u8 txint, txenb;
+        int irq;
+
+        /* Disable transmit interrupts and enable the transmitter. */
+        spin_lock_irqsave(&scc->zlock, flags);
+        txint = zport->regs[1];
+        txenb = zport->regs[5];
+        if (txint & TxINT_ENAB) {
+                zport->regs[1] = txint & ~TxINT_ENAB;
+                write_zsreg(zport, R1, zport->regs[1]);
+        }
+        if (!(txenb & TxENAB)) {
+                zport->regs[5] = txenb | TxENAB;
+                write_zsreg(zport, R5, zport->regs[5]);
+        }
+        spin_unlock_irqrestore(&scc->zlock, flags);
+
+        uart_console_write(&zport->port, s, count, zs_console_putchar);
+
+        /* Restore transmit interrupts and the transmitter enable. */
+        spin_lock_irqsave(&scc->zlock, flags);
+        irq = !irqs_disabled_flags(flags);
+        zs_line_drain(zport, irq);
+        if (!(txenb & TxENAB)) {
+                zport->regs[5] &= ~TxENAB;
+                write_zsreg(zport, R5, zport->regs[5]);
+        }
+        if (txint & TxINT_ENAB) {
+                zport->regs[1] |= TxINT_ENAB;
+                write_zsreg(zport, R1, zport->regs[1]);
+        }
+        spin_unlock_irqrestore(&scc->zlock, flags);
+}
+
+/*
+ * Setup serial console baud/bits/parity.  We do two things here:
+ * - construct a cflag setting for the first uart_open()
+ * - initialise the serial port
+ * Return non-zero if we didn't find a serial port.
+ */
+static int __init zs_console_setup(struct console *co, char *options)
+{
+        int chip = co->index / ZS_NUM_CHAN, side = co->index % ZS_NUM_CHAN;
+        struct zs_port *zport = &zs_sccs[chip].zport[side];
+        struct uart_port *uport = &zport->port;
+        int baud = 9600;
+        int bits = 8;
+        int parity = 'n';
+        int flow = 'n';
+        int ret;
+
+        ret = zs_map_port(uport);
+        if (ret)
+                return ret;
+
+        zs_reset(zport);
+        zs_pm(uport, 0, -1);
+
+        if (options)
+                uart_parse_options(options, &baud, &parity, &bits, &flow);
+        return uart_set_options(uport, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver zs_reg;
+static struct console zs_console = {
+        .name   = "ttyS",
+        .write  = zs_console_write,
+        .device = uart_console_device,
+        .setup  = zs_console_setup,
+        .flags  = CON_PRINTBUFFER,
+        .index  = -1,
+        .data   = &zs_reg,
+};
+
+/*
+ *      Register console.
+ */
+static int __init zs_serial_console_init(void)
+{
+        int ret;
+
+        ret = zs_probe_sccs();
+        if (ret)
+                return ret;
+        register_console(&zs_console);
+
+        return 0;
+}
+
+console_initcall(zs_serial_console_init);
+
+#define SERIAL_ZS_CONSOLE       &zs_console
+#else
+#define SERIAL_ZS_CONSOLE       NULL
+#endif /* CONFIG_SERIAL_ZS_CONSOLE */
+
+static struct uart_driver zs_reg = {
+        .owner                  = THIS_MODULE,
+        .driver_name            = "serial",
+        .dev_name               = "ttyS",
+        .major                  = TTY_MAJOR,
+        .minor                  = 64,
+        .nr                     = ZS_NUM_SCCS * ZS_NUM_CHAN,
+        .cons                   = SERIAL_ZS_CONSOLE,
+};
+
+/* zs_init inits the driver. */
+static int __init zs_init(void)
+{
+        int i, ret;
+
+        pr_info("%s%s\n", zs_name, zs_version);
+
+        /* Find out how many Z85C30 SCCs we have.  */
+        ret = zs_probe_sccs();
+        if (ret)
+                return ret;
+
+        ret = uart_register_driver(&zs_reg);
+        if (ret)
+                return ret;
+
+        for (i = 0; i < ZS_NUM_SCCS * ZS_NUM_CHAN; i++) {
+                struct zs_scc *scc = &zs_sccs[i / ZS_NUM_CHAN];
+                struct zs_port *zport = &scc->zport[i % ZS_NUM_CHAN];
+                struct uart_port *uport = &zport->port;
+
+                if (zport->scc)
+                        uart_add_one_port(&zs_reg, uport);
+        }
+
+        return 0;
+}
+
+static void __exit zs_exit(void)
+{
+        int i;
+
+        for (i = ZS_NUM_SCCS * ZS_NUM_CHAN - 1; i >= 0; i--) {
+                struct zs_scc *scc = &zs_sccs[i / ZS_NUM_CHAN];
+                struct zs_port *zport = &scc->zport[i % ZS_NUM_CHAN];
+                struct uart_port *uport = &zport->port;
+
+                if (zport->scc)
+                        uart_remove_one_port(&zs_reg, uport);
+        }
+
+        uart_unregister_driver(&zs_reg);
+}
+
+module_init(zs_init);
+module_exit(zs_exit);
diff --git a/drivers/tty/serial/zs.h b/drivers/tty/serial/zs.h
new file mode 100644
index 000000000000..aa921b57d827
--- /dev/null
+++ b/drivers/tty/serial/zs.h
@@ -0,0 +1,284 @@
+/*
+ * zs.h: Definitions for the DECstation Z85C30 serial driver.
+ *
+ * Adapted from drivers/sbus/char/sunserial.h by Paul Mackerras.
+ * Adapted from drivers/macintosh/macserial.h by Harald Koerfgen.
+ *
+ * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 2004, 2005, 2007  Maciej W. Rozycki
+ */
+#ifndef _SERIAL_ZS_H
+#define _SERIAL_ZS_H
+
+#ifdef __KERNEL__
+
+#define ZS_NUM_REGS 16
+
+/*
+ * This is our internal structure for each serial port's state.
+ */
+struct zs_port {
+        struct zs_scc   *scc;                   /* Containing SCC.  */
+        struct uart_port port;                  /* Underlying UART.  */
+
+        int             clk_mode;               /* May be 1, 16, 32, or 64.  */
+
+        unsigned int    tty_break;              /* Set on BREAK condition.  */
+        int             tx_stopped;             /* Output is suspended.  */
+
+        unsigned int    mctrl;                  /* State of modem lines.  */
+        u8              brk;                    /* BREAK state from RR0.  */
+
+        u8              regs[ZS_NUM_REGS];      /* Channel write registers.  */
+};
+
+/*
+ * Per-SCC state for locking and the interrupt handler.
+ */
+struct zs_scc {
+        struct zs_port  zport[2];
+        spinlock_t      zlock;
+        atomic_t        irq_guard;
+        int             initialised;
+};
+
+#endif /* __KERNEL__ */
+
+/*
+ * Conversion routines to/from brg time constants from/to bits per second.
+ */
+#define ZS_BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2))
+#define ZS_BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2)
+
+/*
+ * The Zilog register set.
+ */
+
+/* Write Register 0 (Command) */
+#define R0              0       /* Register selects */
+#define R1              1
+#define R2              2
+#define R3              3
+#define R4              4
+#define R5              5
+#define R6              6
+#define R7              7
+#define R8              8
+#define R9              9
+#define R10             10
+#define R11             11
+#define R12             12
+#define R13             13
+#define R14             14
+#define R15             15
+
+#define NULLCODE        0       /* Null Code */
+#define POINT_HIGH      0x8     /* Select upper half of registers */
+#define RES_EXT_INT     0x10    /* Reset Ext. Status Interrupts */
+#define SEND_ABORT      0x18    /* HDLC Abort */
+#define RES_RxINT_FC    0x20    /* Reset RxINT on First Character */
+#define RES_Tx_P        0x28    /* Reset TxINT Pending */
+#define ERR_RES         0x30    /* Error Reset */
+#define RES_H_IUS       0x38    /* Reset highest IUS */
+
+#define RES_Rx_CRC      0x40    /* Reset Rx CRC Checker */
+#define RES_Tx_CRC      0x80    /* Reset Tx CRC Checker */
+#define RES_EOM_L       0xC0    /* Reset EOM latch */
+
+/* Write Register 1 (Tx/Rx/Ext Int Enable and WAIT/DMA Commands) */
+#define EXT_INT_ENAB    0x1     /* Ext Int Enable */
+#define TxINT_ENAB      0x2     /* Tx Int Enable */
+#define PAR_SPEC        0x4     /* Parity is special condition */
+
+#define RxINT_DISAB     0       /* Rx Int Disable */
+#define RxINT_FCERR     0x8     /* Rx Int on First Character Only or Error */
+#define RxINT_ALL       0x10    /* Int on all Rx Characters or error */
+#define RxINT_ERR       0x18    /* Int on error only */
+#define RxINT_MASK      0x18
+
+#define WT_RDY_RT       0x20    /* Wait/Ready on R/T */
+#define WT_FN_RDYFN     0x40    /* Wait/FN/Ready FN */
+#define WT_RDY_ENAB     0x80    /* Wait/Ready Enable */
+
+/* Write Register 2 (Interrupt Vector) */
+
+/* Write Register 3 (Receive Parameters and Control) */
+#define RxENABLE        0x1     /* Rx Enable */
+#define SYNC_L_INH      0x2     /* Sync Character Load Inhibit */
+#define ADD_SM          0x4     /* Address Search Mode (SDLC) */
+#define RxCRC_ENAB      0x8     /* Rx CRC Enable */
+#define ENT_HM          0x10    /* Enter Hunt Mode */
+#define AUTO_ENAB       0x20    /* Auto Enables */
+#define Rx5             0x0     /* Rx 5 Bits/Character */
+#define Rx7             0x40    /* Rx 7 Bits/Character */
+#define Rx6             0x80    /* Rx 6 Bits/Character */
+#define Rx8             0xc0    /* Rx 8 Bits/Character */
+#define RxNBITS_MASK    0xc0
+
+/* Write Register 4 (Transmit/Receive Miscellaneous Parameters and Modes) */
+#define PAR_ENA         0x1     /* Parity Enable */
+#define PAR_EVEN        0x2     /* Parity Even/Odd* */
+
+#define SYNC_ENAB       0       /* Sync Modes Enable */
+#define SB1             0x4     /* 1 stop bit/char */
+#define SB15            0x8     /* 1.5 stop bits/char */
+#define SB2             0xc     /* 2 stop bits/char */
+#define SB_MASK         0xc
+
+#define MONSYNC         0       /* 8 Bit Sync character */
+#define BISYNC          0x10    /* 16 bit sync character */
+#define SDLC            0x20    /* SDLC Mode (01111110 Sync Flag) */
+#define EXTSYNC         0x30    /* External Sync Mode */
+
+#define X1CLK           0x0     /* x1 clock mode */
+#define X16CLK          0x40    /* x16 clock mode */
+#define X32CLK          0x80    /* x32 clock mode */
+#define X64CLK          0xc0    /* x64 clock mode */
+#define XCLK_MASK       0xc0
+
+/* Write Register 5 (Transmit Parameters and Controls) */
+#define TxCRC_ENAB      0x1     /* Tx CRC Enable */
+#define RTS             0x2     /* RTS */
+#define SDLC_CRC        0x4     /* SDLC/CRC-16 */
+#define TxENAB          0x8     /* Tx Enable */
+#define SND_BRK         0x10    /* Send Break */
+#define Tx5             0x0     /* Tx 5 bits (or less)/character */
+#define Tx7             0x20    /* Tx 7 bits/character */
+#define Tx6             0x40    /* Tx 6 bits/character */
+#define Tx8             0x60    /* Tx 8 bits/character */
+#define TxNBITS_MASK    0x60
+#define DTR             0x80    /* DTR */
+
+/* Write Register 6 (Sync bits 0-7/SDLC Address Field) */
+
+/* Write Register 7 (Sync bits 8-15/SDLC 01111110) */
+
+/* Write Register 8 (Transmit Buffer) */
+
+/* Write Register 9 (Master Interrupt Control) */
+#define VIS             1       /* Vector Includes Status */
+#define NV              2       /* No Vector */
+#define DLC             4       /* Disable Lower Chain */
+#define MIE             8       /* Master Interrupt Enable */
+#define STATHI          0x10    /* Status high */
+#define SOFTACK         0x20    /* Software Interrupt Acknowledge */
+#define NORESET         0       /* No reset on write to R9 */
+#define CHRB            0x40    /* Reset channel B */
+#define CHRA            0x80    /* Reset channel A */
+#define FHWRES          0xc0    /* Force hardware reset */
+
+/* Write Register 10 (Miscellaneous Transmitter/Receiver Control Bits) */
+#define BIT6            1       /* 6 bit/8bit sync */
+#define LOOPMODE        2       /* SDLC Loop mode */
+#define ABUNDER         4       /* Abort/flag on SDLC xmit underrun */
+#define MARKIDLE        8       /* Mark/flag on idle */
+#define GAOP            0x10    /* Go active on poll */
+#define NRZ             0       /* NRZ mode */
+#define NRZI            0x20    /* NRZI mode */
+#define FM1             0x40    /* FM1 (transition = 1) */
+#define FM0             0x60    /* FM0 (transition = 0) */
+#define CRCPS           0x80    /* CRC Preset I/O */
+
+/* Write Register 11 (Clock Mode Control) */
+#define TRxCXT          0       /* TRxC = Xtal output */
+#define TRxCTC          1       /* TRxC = Transmit clock */
+#define TRxCBR          2       /* TRxC = BR Generator Output */
+#define TRxCDP          3       /* TRxC = DPLL output */
+#define TRxCOI          4       /* TRxC O/I */
+#define TCRTxCP         0       /* Transmit clock = RTxC pin */
+#define TCTRxCP         8       /* Transmit clock = TRxC pin */
+#define TCBR            0x10    /* Transmit clock = BR Generator output */
+#define TCDPLL          0x18    /* Transmit clock = DPLL output */
+#define RCRTxCP         0       /* Receive clock = RTxC pin */
+#define RCTRxCP         0x20    /* Receive clock = TRxC pin */
+#define RCBR            0x40    /* Receive clock = BR Generator output */
+#define RCDPLL          0x60    /* Receive clock = DPLL output */
+#define RTxCX           0x80    /* RTxC Xtal/No Xtal */
+
+/* Write Register 12 (Lower Byte of Baud Rate Generator Time Constant) */
+
+/* Write Register 13 (Upper Byte of Baud Rate Generator Time Constant) */
+
+/* Write Register 14 (Miscellaneous Control Bits) */
+#define BRENABL         1       /* Baud rate generator enable */
+#define BRSRC           2       /* Baud rate generator source */
+#define DTRREQ          4       /* DTR/Request function */
+#define AUTOECHO        8       /* Auto Echo */
+#define LOOPBAK         0x10    /* Local loopback */
+#define SEARCH          0x20    /* Enter search mode */
+#define RMC             0x40    /* Reset missing clock */
+#define DISDPLL         0x60    /* Disable DPLL */
+#define SSBR            0x80    /* Set DPLL source = BR generator */
+#define SSRTxC          0xa0    /* Set DPLL source = RTxC */
+#define SFMM            0xc0    /* Set FM mode */
+#define SNRZI           0xe0    /* Set NRZI mode */
+
+/* Write Register 15 (External/Status Interrupt Control) */
+#define WR7P_EN         1       /* WR7 Prime SDLC Feature Enable */
+#define ZCIE            2       /* Zero count IE */
+#define DCDIE           8       /* DCD IE */
+#define SYNCIE          0x10    /* Sync/hunt IE */
+#define CTSIE           0x20    /* CTS IE */
+#define TxUIE           0x40    /* Tx Underrun/EOM IE */
+#define BRKIE           0x80    /* Break/Abort IE */
+
+
+/* Read Register 0 (Transmit/Receive Buffer Status and External Status) */
+#define Rx_CH_AV        0x1     /* Rx Character Available */
+#define ZCOUNT          0x2     /* Zero count */
+#define Tx_BUF_EMP      0x4     /* Tx Buffer empty */
+#define DCD             0x8     /* DCD */
+#define SYNC_HUNT       0x10    /* Sync/hunt */
+#define CTS             0x20    /* CTS */
+#define TxEOM           0x40    /* Tx underrun */
+#define BRK_ABRT        0x80    /* Break/Abort */
+
+/* Read Register 1 (Special Receive Condition Status) */
+#define ALL_SNT         0x1     /* All sent */
+/* Residue Data for 8 Rx bits/char programmed */
+#define RES3            0x8     /* 0/3 */
+#define RES4            0x4     /* 0/4 */
+#define RES5            0xc     /* 0/5 */
+#define RES6            0x2     /* 0/6 */
+#define RES7            0xa     /* 0/7 */
+#define RES8            0x6     /* 0/8 */
+#define RES18           0xe     /* 1/8 */
+#define RES28           0x0     /* 2/8 */
+/* Special Rx Condition Interrupts */
+#define PAR_ERR         0x10    /* Parity Error */
+#define Rx_OVR          0x20    /* Rx Overrun Error */
+#define FRM_ERR         0x40    /* CRC/Framing Error */
+#define END_FR          0x80    /* End of Frame (SDLC) */
+
+/* Read Register 2 (Interrupt Vector (WR2) -- channel A).  */
+
+/* Read Register 2 (Modified Interrupt Vector -- channel B).  */
+
+/* Read Register 3 (Interrupt Pending Bits -- channel A only).  */
+#define CHBEXT          0x1     /* Channel B Ext/Stat IP */
+#define CHBTxIP         0x2     /* Channel B Tx IP */
+#define CHBRxIP         0x4     /* Channel B Rx IP */
+#define CHAEXT          0x8     /* Channel A Ext/Stat IP */
+#define CHATxIP         0x10    /* Channel A Tx IP */
+#define CHARxIP         0x20    /* Channel A Rx IP */
+
+/* Read Register 6 (SDLC FIFO Status and Byte Count LSB) */
+
+/* Read Register 7 (SDLC FIFO Status and Byte Count MSB) */
+
+/* Read Register 8 (Receive Data) */
+
+/* Read Register 10 (Miscellaneous Status Bits) */
+#define ONLOOP          2       /* On loop */
+#define LOOPSEND        0x10    /* Loop sending */
+#define CLK2MIS         0x40    /* Two clocks missing */
+#define CLK1MIS         0x80    /* One clock missing */
+
+/* Read Register 12 (Lower Byte of Baud Rate Generator Constant (WR12)) */
+
+/* Read Register 13 (Upper Byte of Baud Rate Generator Constant (WR13) */
+
+/* Read Register 15 (External/Status Interrupt Control (WR15)) */
+
+#endif /* _SERIAL_ZS_H */
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
new file mode 100644
index 000000000000..272e417a9b0d
--- /dev/null
+++ b/drivers/tty/synclink.c
@@ -0,0 +1,8117 @@
+/*
+ * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
+ *
+ * Device driver for Microgate SyncLink ISA and PCI
+ * high speed multiprotocol serial adapters.
+ *
+ * written by Paul Fulghum for Microgate Corporation
+ * paulkf@microgate.com
+ *
+ * Microgate and SyncLink are trademarks of Microgate Corporation
+ *
+ * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
+ *
+ * Original release 01/11/99
+ *
+ * This code is released under the GNU General Public License (GPL)
+ *
+ * This driver is primarily intended for use in synchronous
+ * HDLC mode. Asynchronous mode is also provided.
+ *
+ * When operating in synchronous mode, each call to mgsl_write()
+ * contains exactly one complete HDLC frame. Calling mgsl_put_char
+ * will start assembling an HDLC frame that will not be sent until
+ * mgsl_flush_chars or mgsl_write is called.
+ * 
+ * Synchronous receive data is reported as complete frames. To accomplish
+ * this, the TTY flip buffer is bypassed (too small to hold largest
+ * frame and may fragment frames) and the line discipline
+ * receive entry point is called directly.
+ *
+ * This driver has been tested with a slightly modified ppp.c driver
+ * for synchronous PPP.
+ *
+ * 2000/02/16
+ * Added interface for syncppp.c driver (an alternate synchronous PPP
+ * implementation that also supports Cisco HDLC). Each device instance
+ * registers as a tty device AND a network device (if dosyncppp option
+ * is set for the device). The functionality is determined by which
+ * device interface is opened.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if defined(__i386__)
+#  define BREAKPOINT() asm("   int $3");
+#else
+#  define BREAKPOINT() { }
+#endif
+
+#define MAX_ISA_DEVICES 10
+#define MAX_PCI_DEVICES 10
+#define MAX_TOTAL_DEVICES 20
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/synclink.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+#include <linux/bitops.h>
+#include <asm/types.h>
+#include <linux/termios.h>
+#include <linux/workqueue.h>
+#include <linux/hdlc.h>
+#include <linux/dma-mapping.h>
+
+#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
+#define SYNCLINK_GENERIC_HDLC 1
+#else
+#define SYNCLINK_GENERIC_HDLC 0
+#endif
+
+#define GET_USER(error,value,addr) error = get_user(value,addr)
+#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
+#define PUT_USER(error,value,addr) error = put_user(value,addr)
+#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
+
+#include <asm/uaccess.h>
+
+#define RCLRVALUE 0xffff
+
+static MGSL_PARAMS default_params = {
+        MGSL_MODE_HDLC,                 /* unsigned long mode */
+        0,                              /* unsigned char loopback; */
+        HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
+        HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
+        0,                              /* unsigned long clock_speed; */
+        0xff,                           /* unsigned char addr_filter; */
+        HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
+        HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
+        HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
+        9600,                           /* unsigned long data_rate; */
+        8,                              /* unsigned char data_bits; */
+        1,                              /* unsigned char stop_bits; */
+        ASYNC_PARITY_NONE               /* unsigned char parity; */
+};
+
+#define SHARED_MEM_ADDRESS_SIZE 0x40000
+#define BUFFERLISTSIZE 4096
+#define DMABUFFERSIZE 4096
+#define MAXRXFRAMES 7
+
+typedef struct _DMABUFFERENTRY
+{
+        u32 phys_addr;  /* 32-bit flat physical address of data buffer */
+        volatile u16 count;     /* buffer size/data count */
+        volatile u16 status;    /* Control/status field */
+        volatile u16 rcc;       /* character count field */
+        u16 reserved;   /* padding required by 16C32 */
+        u32 link;       /* 32-bit flat link to next buffer entry */
+        char *virt_addr;        /* virtual address of data buffer */
+        u32 phys_entry; /* physical address of this buffer entry */
+        dma_addr_t dma_addr;
+} DMABUFFERENTRY, *DMAPBUFFERENTRY;
+
+/* The queue of BH actions to be performed */
+
+#define BH_RECEIVE  1
+#define BH_TRANSMIT 2
+#define BH_STATUS   4
+
+#define IO_PIN_SHUTDOWN_LIMIT 100
+
+struct  _input_signal_events {
+        int     ri_up;  
+        int     ri_down;
+        int     dsr_up;
+        int     dsr_down;
+        int     dcd_up;
+        int     dcd_down;
+        int     cts_up;
+        int     cts_down;
+};
+
+/* transmit holding buffer definitions*/
+#define MAX_TX_HOLDING_BUFFERS 5
+struct tx_holding_buffer {
+        int     buffer_size;
+        unsigned char * buffer;
+};
+
+
+/*
+ * Device instance data structure
+ */
+ 
+struct mgsl_struct {
+        int                     magic;
+        struct tty_port         port;
+        int                     line;
+        int                     hw_version;
+        
+        struct mgsl_icount      icount;
+        
+        int                     timeout;
+        int                     x_char;         /* xon/xoff character */
+        u16                     read_status_mask;
+        u16                     ignore_status_mask;     
+        unsigned char           *xmit_buf;
+        int                     xmit_head;
+        int                     xmit_tail;
+        int                     xmit_cnt;
+        
+        wait_queue_head_t       status_event_wait_q;
+        wait_queue_head_t       event_wait_q;
+        struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
+        struct mgsl_struct      *next_device;   /* device list link */
+        
+        spinlock_t irq_spinlock;                /* spinlock for synchronizing with ISR */
+        struct work_struct task;                /* task structure for scheduling bh */
+
+        u32 EventMask;                  /* event trigger mask */
+        u32 RecordedEvents;             /* pending events */
+
+        u32 max_frame_size;             /* as set by device config */
+
+        u32 pending_bh;
+
+        bool bh_running;                /* Protection from multiple */
+        int isr_overflow;
+        bool bh_requested;
+        
+        int dcd_chkcount;               /* check counts to prevent */
+        int cts_chkcount;               /* too many IRQs if a signal */
+        int dsr_chkcount;               /* is floating */
+        int ri_chkcount;
+
+        char *buffer_list;              /* virtual address of Rx & Tx buffer lists */
+        u32 buffer_list_phys;
+        dma_addr_t buffer_list_dma_addr;
+
+        unsigned int rx_buffer_count;   /* count of total allocated Rx buffers */
+        DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
+        unsigned int current_rx_buffer;
+
+        int num_tx_dma_buffers;         /* number of tx dma frames required */
+        int tx_dma_buffers_used;
+        unsigned int tx_buffer_count;   /* count of total allocated Tx buffers */
+        DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
+        int start_tx_dma_buffer;        /* tx dma buffer to start tx dma operation */
+        int current_tx_buffer;          /* next tx dma buffer to be loaded */
+        
+        unsigned char *intermediate_rxbuffer;
+
+        int num_tx_holding_buffers;     /* number of tx holding buffer allocated */
+        int get_tx_holding_index;       /* next tx holding buffer for adapter to load */
+        int put_tx_holding_index;       /* next tx holding buffer to store user request */
+        int tx_holding_count;           /* number of tx holding buffers waiting */
+        struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
+
+        bool rx_enabled;
+        bool rx_overflow;
+        bool rx_rcc_underrun;
+
+        bool tx_enabled;
+        bool tx_active;
+        u32 idle_mode;
+
+        u16 cmr_value;
+        u16 tcsr_value;
+
+        char device_name[25];           /* device instance name */
+
+        unsigned int bus_type;  /* expansion bus type (ISA,EISA,PCI) */
+        unsigned char bus;              /* expansion bus number (zero based) */
+        unsigned char function;         /* PCI device number */
+
+        unsigned int io_base;           /* base I/O address of adapter */
+        unsigned int io_addr_size;      /* size of the I/O address range */
+        bool io_addr_requested;         /* true if I/O address requested */
+        
+        unsigned int irq_level;         /* interrupt level */
+        unsigned long irq_flags;
+        bool irq_requested;             /* true if IRQ requested */
+        
+        unsigned int dma_level;         /* DMA channel */
+        bool dma_requested;             /* true if dma channel requested */
+
+        u16 mbre_bit;
+        u16 loopback_bits;
+        u16 usc_idle_mode;
+
+        MGSL_PARAMS params;             /* communications parameters */
+
+        unsigned char serial_signals;   /* current serial signal states */
+
+        bool irq_occurred;              /* for diagnostics use */
+        unsigned int init_error;        /* Initialization startup error                 (DIAGS) */
+        int     fDiagnosticsmode;       /* Driver in Diagnostic mode?                   (DIAGS) */
+
+        u32 last_mem_alloc;
+        unsigned char* memory_base;     /* shared memory address (PCI only) */
+        u32 phys_memory_base;
+        bool shared_mem_requested;
+
+        unsigned char* lcr_base;        /* local config registers (PCI only) */
+        u32 phys_lcr_base;
+        u32 lcr_offset;
+        bool lcr_mem_requested;
+
+        u32 misc_ctrl_value;
+        char flag_buf[MAX_ASYNC_BUFFER_SIZE];
+        char char_buf[MAX_ASYNC_BUFFER_SIZE];   
+        bool drop_rts_on_tx_done;
+
+        bool loopmode_insert_requested;
+        bool loopmode_send_done_requested;
+        
+        struct  _input_signal_events    input_signal_events;
+
+        /* generic HDLC device parts */
+        int netcount;
+        spinlock_t netlock;
+
+#if SYNCLINK_GENERIC_HDLC
+        struct net_device *netdev;
+#endif
+};
+
+#define MGSL_MAGIC 0x5401
+
+/*
+ * The size of the serial xmit buffer is 1 page, or 4096 bytes
+ */
+#ifndef SERIAL_XMIT_SIZE
+#define SERIAL_XMIT_SIZE 4096
+#endif
+
+/*
+ * These macros define the offsets used in calculating the
+ * I/O address of the specified USC registers.
+ */
+
+
+#define DCPIN 2         /* Bit 1 of I/O address */
+#define SDPIN 4         /* Bit 2 of I/O address */
+
+#define DCAR 0          /* DMA command/address register */
+#define CCAR SDPIN              /* channel command/address register */
+#define DATAREG DCPIN + SDPIN   /* serial data register */
+#define MSBONLY 0x41
+#define LSBONLY 0x40
+
+/*
+ * These macros define the register address (ordinal number)
+ * used for writing address/value pairs to the USC.
+ */
+
+#define CMR     0x02    /* Channel mode Register */
+#define CCSR    0x04    /* Channel Command/status Register */
+#define CCR     0x06    /* Channel Control Register */
+#define PSR     0x08    /* Port status Register */
+#define PCR     0x0a    /* Port Control Register */
+#define TMDR    0x0c    /* Test mode Data Register */
+#define TMCR    0x0e    /* Test mode Control Register */
+#define CMCR    0x10    /* Clock mode Control Register */
+#define HCR     0x12    /* Hardware Configuration Register */
+#define IVR     0x14    /* Interrupt Vector Register */
+#define IOCR    0x16    /* Input/Output Control Register */
+#define ICR     0x18    /* Interrupt Control Register */
+#define DCCR    0x1a    /* Daisy Chain Control Register */
+#define MISR    0x1c    /* Misc Interrupt status Register */
+#define SICR    0x1e    /* status Interrupt Control Register */
+#define RDR     0x20    /* Receive Data Register */
+#define RMR     0x22    /* Receive mode Register */
+#define RCSR    0x24    /* Receive Command/status Register */
+#define RICR    0x26    /* Receive Interrupt Control Register */
+#define RSR     0x28    /* Receive Sync Register */
+#define RCLR    0x2a    /* Receive count Limit Register */
+#define RCCR    0x2c    /* Receive Character count Register */
+#define TC0R    0x2e    /* Time Constant 0 Register */
+#define TDR     0x30    /* Transmit Data Register */
+#define TMR     0x32    /* Transmit mode Register */
+#define TCSR    0x34    /* Transmit Command/status Register */
+#define TICR    0x36    /* Transmit Interrupt Control Register */
+#define TSR     0x38    /* Transmit Sync Register */
+#define TCLR    0x3a    /* Transmit count Limit Register */
+#define TCCR    0x3c    /* Transmit Character count Register */
+#define TC1R    0x3e    /* Time Constant 1 Register */
+
+
+/*
+ * MACRO DEFINITIONS FOR DMA REGISTERS
+ */
+
+#define DCR     0x06    /* DMA Control Register (shared) */
+#define DACR    0x08    /* DMA Array count Register (shared) */
+#define BDCR    0x12    /* Burst/Dwell Control Register (shared) */
+#define DIVR    0x14    /* DMA Interrupt Vector Register (shared) */    
+#define DICR    0x18    /* DMA Interrupt Control Register (shared) */
+#define CDIR    0x1a    /* Clear DMA Interrupt Register (shared) */
+#define SDIR    0x1c    /* Set DMA Interrupt Register (shared) */
+
+#define TDMR    0x02    /* Transmit DMA mode Register */
+#define TDIAR   0x1e    /* Transmit DMA Interrupt Arm Register */
+#define TBCR    0x2a    /* Transmit Byte count Register */
+#define TARL    0x2c    /* Transmit Address Register (low) */
+#define TARU    0x2e    /* Transmit Address Register (high) */
+#define NTBCR   0x3a    /* Next Transmit Byte count Register */
+#define NTARL   0x3c    /* Next Transmit Address Register (low) */
+#define NTARU   0x3e    /* Next Transmit Address Register (high) */
+
+#define RDMR    0x82    /* Receive DMA mode Register (non-shared) */
+#define RDIAR   0x9e    /* Receive DMA Interrupt Arm Register */
+#define RBCR    0xaa    /* Receive Byte count Register */
+#define RARL    0xac    /* Receive Address Register (low) */
+#define RARU    0xae    /* Receive Address Register (high) */
+#define NRBCR   0xba    /* Next Receive Byte count Register */
+#define NRARL   0xbc    /* Next Receive Address Register (low) */
+#define NRARU   0xbe    /* Next Receive Address Register (high) */
+
+
+/*
+ * MACRO DEFINITIONS FOR MODEM STATUS BITS
+ */
+
+#define MODEMSTATUS_DTR 0x80
+#define MODEMSTATUS_DSR 0x40
+#define MODEMSTATUS_RTS 0x20
+#define MODEMSTATUS_CTS 0x10
+#define MODEMSTATUS_RI  0x04
+#define MODEMSTATUS_DCD 0x01
+
+
+/*
+ * Channel Command/Address Register (CCAR) Command Codes
+ */
+
+#define RTCmd_Null                      0x0000
+#define RTCmd_ResetHighestIus           0x1000
+#define RTCmd_TriggerChannelLoadDma     0x2000
+#define RTCmd_TriggerRxDma              0x2800
+#define RTCmd_TriggerTxDma              0x3000
+#define RTCmd_TriggerRxAndTxDma         0x3800
+#define RTCmd_PurgeRxFifo               0x4800
+#define RTCmd_PurgeTxFifo               0x5000
+#define RTCmd_PurgeRxAndTxFifo          0x5800
+#define RTCmd_LoadRcc                   0x6800
+#define RTCmd_LoadTcc                   0x7000
+#define RTCmd_LoadRccAndTcc             0x7800
+#define RTCmd_LoadTC0                   0x8800
+#define RTCmd_LoadTC1                   0x9000
+#define RTCmd_LoadTC0AndTC1             0x9800
+#define RTCmd_SerialDataLSBFirst        0xa000
+#define RTCmd_SerialDataMSBFirst        0xa800
+#define RTCmd_SelectBigEndian           0xb000
+#define RTCmd_SelectLittleEndian        0xb800
+
+
+/*
+ * DMA Command/Address Register (DCAR) Command Codes
+ */
+
+#define DmaCmd_Null                     0x0000
+#define DmaCmd_ResetTxChannel           0x1000
+#define DmaCmd_ResetRxChannel           0x1200
+#define DmaCmd_StartTxChannel           0x2000
+#define DmaCmd_StartRxChannel           0x2200
+#define DmaCmd_ContinueTxChannel        0x3000
+#define DmaCmd_ContinueRxChannel        0x3200
+#define DmaCmd_PauseTxChannel           0x4000
+#define DmaCmd_PauseRxChannel           0x4200
+#define DmaCmd_AbortTxChannel           0x5000
+#define DmaCmd_AbortRxChannel           0x5200
+#define DmaCmd_InitTxChannel            0x7000
+#define DmaCmd_InitRxChannel            0x7200
+#define DmaCmd_ResetHighestDmaIus       0x8000
+#define DmaCmd_ResetAllChannels         0x9000
+#define DmaCmd_StartAllChannels         0xa000
+#define DmaCmd_ContinueAllChannels      0xb000
+#define DmaCmd_PauseAllChannels         0xc000
+#define DmaCmd_AbortAllChannels         0xd000
+#define DmaCmd_InitAllChannels          0xf000
+
+#define TCmd_Null                       0x0000
+#define TCmd_ClearTxCRC                 0x2000
+#define TCmd_SelectTicrTtsaData         0x4000
+#define TCmd_SelectTicrTxFifostatus     0x5000
+#define TCmd_SelectTicrIntLevel         0x6000
+#define TCmd_SelectTicrdma_level                0x7000
+#define TCmd_SendFrame                  0x8000
+#define TCmd_SendAbort                  0x9000
+#define TCmd_EnableDleInsertion         0xc000
+#define TCmd_DisableDleInsertion        0xd000
+#define TCmd_ClearEofEom                0xe000
+#define TCmd_SetEofEom                  0xf000
+
+#define RCmd_Null                       0x0000
+#define RCmd_ClearRxCRC                 0x2000
+#define RCmd_EnterHuntmode              0x3000
+#define RCmd_SelectRicrRtsaData         0x4000
+#define RCmd_SelectRicrRxFifostatus     0x5000
+#define RCmd_SelectRicrIntLevel         0x6000
+#define RCmd_SelectRicrdma_level                0x7000
+
+/*
+ * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
+ */
+ 
+#define RECEIVE_STATUS          BIT5
+#define RECEIVE_DATA            BIT4
+#define TRANSMIT_STATUS         BIT3
+#define TRANSMIT_DATA           BIT2
+#define IO_PIN                  BIT1
+#define MISC                    BIT0
+
+
+/*
+ * Receive status Bits in Receive Command/status Register RCSR
+ */
+
+#define RXSTATUS_SHORT_FRAME            BIT8
+#define RXSTATUS_CODE_VIOLATION         BIT8
+#define RXSTATUS_EXITED_HUNT            BIT7
+#define RXSTATUS_IDLE_RECEIVED          BIT6
+#define RXSTATUS_BREAK_RECEIVED         BIT5
+#define RXSTATUS_ABORT_RECEIVED         BIT5
+#define RXSTATUS_RXBOUND                BIT4
+#define RXSTATUS_CRC_ERROR              BIT3
+#define RXSTATUS_FRAMING_ERROR          BIT3
+#define RXSTATUS_ABORT                  BIT2
+#define RXSTATUS_PARITY_ERROR           BIT2
+#define RXSTATUS_OVERRUN                BIT1
+#define RXSTATUS_DATA_AVAILABLE         BIT0
+#define RXSTATUS_ALL                    0x01f6
+#define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
+
+/*
+ * Values for setting transmit idle mode in 
+ * Transmit Control/status Register (TCSR)
+ */
+#define IDLEMODE_FLAGS                  0x0000
+#define IDLEMODE_ALT_ONE_ZERO           0x0100
+#define IDLEMODE_ZERO                   0x0200
+#define IDLEMODE_ONE                    0x0300
+#define IDLEMODE_ALT_MARK_SPACE         0x0500
+#define IDLEMODE_SPACE                  0x0600
+#define IDLEMODE_MARK                   0x0700
+#define IDLEMODE_MASK                   0x0700
+
+/*
+ * IUSC revision identifiers
+ */
+#define IUSC_SL1660                     0x4d44
+#define IUSC_PRE_SL1660                 0x4553
+
+/*
+ * Transmit status Bits in Transmit Command/status Register (TCSR)
+ */
+
+#define TCSR_PRESERVE                   0x0F00
+
+#define TCSR_UNDERWAIT                  BIT11
+#define TXSTATUS_PREAMBLE_SENT          BIT7
+#define TXSTATUS_IDLE_SENT              BIT6
+#define TXSTATUS_ABORT_SENT             BIT5
+#define TXSTATUS_EOF_SENT               BIT4
+#define TXSTATUS_EOM_SENT               BIT4
+#define TXSTATUS_CRC_SENT               BIT3
+#define TXSTATUS_ALL_SENT               BIT2
+#define TXSTATUS_UNDERRUN               BIT1
+#define TXSTATUS_FIFO_EMPTY             BIT0
+#define TXSTATUS_ALL                    0x00fa
+#define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
+                                
+
+#define MISCSTATUS_RXC_LATCHED          BIT15
+#define MISCSTATUS_RXC                  BIT14
+#define MISCSTATUS_TXC_LATCHED          BIT13
+#define MISCSTATUS_TXC                  BIT12
+#define MISCSTATUS_RI_LATCHED           BIT11
+#define MISCSTATUS_RI                   BIT10
+#define MISCSTATUS_DSR_LATCHED          BIT9
+#define MISCSTATUS_DSR                  BIT8
+#define MISCSTATUS_DCD_LATCHED          BIT7
+#define MISCSTATUS_DCD                  BIT6
+#define MISCSTATUS_CTS_LATCHED          BIT5
+#define MISCSTATUS_CTS                  BIT4
+#define MISCSTATUS_RCC_UNDERRUN         BIT3
+#define MISCSTATUS_DPLL_NO_SYNC         BIT2
+#define MISCSTATUS_BRG1_ZERO            BIT1
+#define MISCSTATUS_BRG0_ZERO            BIT0
+
+#define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
+#define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
+
+#define SICR_RXC_ACTIVE                 BIT15
+#define SICR_RXC_INACTIVE               BIT14
+#define SICR_RXC                        (BIT15+BIT14)
+#define SICR_TXC_ACTIVE                 BIT13
+#define SICR_TXC_INACTIVE               BIT12
+#define SICR_TXC                        (BIT13+BIT12)
+#define SICR_RI_ACTIVE                  BIT11
+#define SICR_RI_INACTIVE                BIT10
+#define SICR_RI                         (BIT11+BIT10)
+#define SICR_DSR_ACTIVE                 BIT9
+#define SICR_DSR_INACTIVE               BIT8
+#define SICR_DSR                        (BIT9+BIT8)
+#define SICR_DCD_ACTIVE                 BIT7
+#define SICR_DCD_INACTIVE               BIT6
+#define SICR_DCD                        (BIT7+BIT6)
+#define SICR_CTS_ACTIVE                 BIT5
+#define SICR_CTS_INACTIVE               BIT4
+#define SICR_CTS                        (BIT5+BIT4)
+#define SICR_RCC_UNDERFLOW              BIT3
+#define SICR_DPLL_NO_SYNC               BIT2
+#define SICR_BRG1_ZERO                  BIT1
+#define SICR_BRG0_ZERO                  BIT0
+
+void usc_DisableMasterIrqBit( struct mgsl_struct *info );
+void usc_EnableMasterIrqBit( struct mgsl_struct *info );
+void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
+void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
+void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
+
+#define usc_EnableInterrupts( a, b ) \
+        usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
+
+#define usc_DisableInterrupts( a, b ) \
+        usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
+
+#define usc_EnableMasterIrqBit(a) \
+        usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
+
+#define usc_DisableMasterIrqBit(a) \
+        usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
+
+#define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
+
+/*
+ * Transmit status Bits in Transmit Control status Register (TCSR)
+ * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
+ */
+
+#define TXSTATUS_PREAMBLE_SENT  BIT7
+#define TXSTATUS_IDLE_SENT      BIT6
+#define TXSTATUS_ABORT_SENT     BIT5
+#define TXSTATUS_EOF            BIT4
+#define TXSTATUS_CRC_SENT       BIT3
+#define TXSTATUS_ALL_SENT       BIT2
+#define TXSTATUS_UNDERRUN       BIT1
+#define TXSTATUS_FIFO_EMPTY     BIT0
+
+#define DICR_MASTER             BIT15
+#define DICR_TRANSMIT           BIT0
+#define DICR_RECEIVE            BIT1
+
+#define usc_EnableDmaInterrupts(a,b) \
+        usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
+
+#define usc_DisableDmaInterrupts(a,b) \
+        usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
+
+#define usc_EnableStatusIrqs(a,b) \
+        usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
+
+#define usc_DisablestatusIrqs(a,b) \
+        usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
+
+/* Transmit status Bits in Transmit Control status Register (TCSR) */
+/* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
+
+
+#define DISABLE_UNCONDITIONAL    0
+#define DISABLE_END_OF_FRAME     1
+#define ENABLE_UNCONDITIONAL     2
+#define ENABLE_AUTO_CTS          3
+#define ENABLE_AUTO_DCD          3
+#define usc_EnableTransmitter(a,b) \
+        usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
+#define usc_EnableReceiver(a,b) \
+        usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
+
+static u16  usc_InDmaReg( struct mgsl_struct *info, u16 Port );
+static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
+static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
+
+static u16  usc_InReg( struct mgsl_struct *info, u16 Port );
+static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
+static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
+void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
+void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
+
+#define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
+#define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
+
+#define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
+
+static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
+static void usc_start_receiver( struct mgsl_struct *info );
+static void usc_stop_receiver( struct mgsl_struct *info );
+
+static void usc_start_transmitter( struct mgsl_struct *info );
+static void usc_stop_transmitter( struct mgsl_struct *info );
+static void usc_set_txidle( struct mgsl_struct *info );
+static void usc_load_txfifo( struct mgsl_struct *info );
+
+static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
+static void usc_enable_loopback( struct mgsl_struct *info, int enable );
+
+static void usc_get_serial_signals( struct mgsl_struct *info );
+static void usc_set_serial_signals( struct mgsl_struct *info );
+
+static void usc_reset( struct mgsl_struct *info );
+
+static void usc_set_sync_mode( struct mgsl_struct *info );
+static void usc_set_sdlc_mode( struct mgsl_struct *info );
+static void usc_set_async_mode( struct mgsl_struct *info );
+static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
+
+static void usc_loopback_frame( struct mgsl_struct *info );
+
+static void mgsl_tx_timeout(unsigned long context);
+
+
+static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
+static void usc_loopmode_insert_request( struct mgsl_struct * info );
+static int usc_loopmode_active( struct mgsl_struct * info);
+static void usc_loopmode_send_done( struct mgsl_struct * info );
+
+static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
+
+#if SYNCLINK_GENERIC_HDLC
+#define dev_to_port(D) (dev_to_hdlc(D)->priv)
+static void hdlcdev_tx_done(struct mgsl_struct *info);
+static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
+static int  hdlcdev_init(struct mgsl_struct *info);
+static void hdlcdev_exit(struct mgsl_struct *info);
+#endif
+
+/*
+ * Defines a BUS descriptor value for the PCI adapter
+ * local bus address ranges.
+ */
+
+#define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
+(0x00400020 + \
+((WrHold) << 30) + \
+((WrDly)  << 28) + \
+((RdDly)  << 26) + \
+((Nwdd)   << 20) + \
+((Nwad)   << 15) + \
+((Nxda)   << 13) + \
+((Nrdd)   << 11) + \
+((Nrad)   <<  6) )
+
+static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
+
+/*
+ * Adapter diagnostic routines
+ */
+static bool mgsl_register_test( struct mgsl_struct *info );
+static bool mgsl_irq_test( struct mgsl_struct *info );
+static bool mgsl_dma_test( struct mgsl_struct *info );
+static bool mgsl_memory_test( struct mgsl_struct *info );
+static int mgsl_adapter_test( struct mgsl_struct *info );
+
+/*
+ * device and resource management routines
+ */
+static int mgsl_claim_resources(struct mgsl_struct *info);
+static void mgsl_release_resources(struct mgsl_struct *info);
+static void mgsl_add_device(struct mgsl_struct *info);
+static struct mgsl_struct* mgsl_allocate_device(void);
+
+/*
+ * DMA buffer manupulation functions.
+ */
+static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
+static bool mgsl_get_rx_frame( struct mgsl_struct *info );
+static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
+static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
+static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
+static int num_free_tx_dma_buffers(struct mgsl_struct *info);
+static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
+static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
+
+/*
+ * DMA and Shared Memory buffer allocation and formatting
+ */
+static int  mgsl_allocate_dma_buffers(struct mgsl_struct *info);
+static void mgsl_free_dma_buffers(struct mgsl_struct *info);
+static int  mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
+static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
+static int  mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
+static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
+static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
+static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
+static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
+static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
+static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
+static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
+
+/*
+ * Bottom half interrupt handlers
+ */
+static void mgsl_bh_handler(struct work_struct *work);
+static void mgsl_bh_receive(struct mgsl_struct *info);
+static void mgsl_bh_transmit(struct mgsl_struct *info);
+static void mgsl_bh_status(struct mgsl_struct *info);
+
+/*
+ * Interrupt handler routines and dispatch table.
+ */
+static void mgsl_isr_null( struct mgsl_struct *info );
+static void mgsl_isr_transmit_data( struct mgsl_struct *info );
+static void mgsl_isr_receive_data( struct mgsl_struct *info );
+static void mgsl_isr_receive_status( struct mgsl_struct *info );
+static void mgsl_isr_transmit_status( struct mgsl_struct *info );
+static void mgsl_isr_io_pin( struct mgsl_struct *info );
+static void mgsl_isr_misc( struct mgsl_struct *info );
+static void mgsl_isr_receive_dma( struct mgsl_struct *info );
+static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
+
+typedef void (*isr_dispatch_func)(struct mgsl_struct *);
+
+static isr_dispatch_func UscIsrTable[7] =
+{
+        mgsl_isr_null,
+        mgsl_isr_misc,
+        mgsl_isr_io_pin,
+        mgsl_isr_transmit_data,
+        mgsl_isr_transmit_status,
+        mgsl_isr_receive_data,
+        mgsl_isr_receive_status
+};
+
+/*
+ * ioctl call handlers
+ */
+static int tiocmget(struct tty_struct *tty);
+static int tiocmset(struct tty_struct *tty,
+                    unsigned int set, unsigned int clear);
+static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
+        __user *user_icount);
+static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS  __user *user_params);
+static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS  __user *new_params);
+static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
+static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
+static int mgsl_txenable(struct mgsl_struct * info, int enable);
+static int mgsl_txabort(struct mgsl_struct * info);
+static int mgsl_rxenable(struct mgsl_struct * info, int enable);
+static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
+static int mgsl_loopmode_send_done( struct mgsl_struct * info );
+
+/* set non-zero on successful registration with PCI subsystem */
+static bool pci_registered;
+
+/*
+ * Global linked list of SyncLink devices
+ */
+static struct mgsl_struct *mgsl_device_list;
+static int mgsl_device_count;
+
+/*
+ * Set this param to non-zero to load eax with the
+ * .text section address and breakpoint on module load.
+ * This is useful for use with gdb and add-symbol-file command.
+ */
+static int break_on_load;
+
+/*
+ * Driver major number, defaults to zero to get auto
+ * assigned major number. May be forced as module parameter.
+ */
+static int ttymajor;
+
+/*
+ * Array of user specified options for ISA adapters.
+ */
+static int io[MAX_ISA_DEVICES];
+static int irq[MAX_ISA_DEVICES];
+static int dma[MAX_ISA_DEVICES];
+static int debug_level;
+static int maxframe[MAX_TOTAL_DEVICES];
+static int txdmabufs[MAX_TOTAL_DEVICES];
+static int txholdbufs[MAX_TOTAL_DEVICES];
+        
+module_param(break_on_load, bool, 0);
+module_param(ttymajor, int, 0);
+module_param_array(io, int, NULL, 0);
+module_param_array(irq, int, NULL, 0);
+module_param_array(dma, int, NULL, 0);
+module_param(debug_level, int, 0);
+module_param_array(maxframe, int, NULL, 0);
+module_param_array(txdmabufs, int, NULL, 0);
+module_param_array(txholdbufs, int, NULL, 0);
+
+static char *driver_name = "SyncLink serial driver";
+static char *driver_version = "$Revision: 4.38 $";
+
+static int synclink_init_one (struct pci_dev *dev,
+                                     const struct pci_device_id *ent);
+static void synclink_remove_one (struct pci_dev *dev);
+
+static struct pci_device_id synclink_pci_tbl[] = {
+        { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
+        { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
+        { 0, }, /* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
+
+MODULE_LICENSE("GPL");
+
+static struct pci_driver synclink_pci_driver = {
+        .name           = "synclink",
+        .id_table       = synclink_pci_tbl,
+        .probe          = synclink_init_one,
+        .remove         = __devexit_p(synclink_remove_one),
+};
+
+static struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+
+static void mgsl_change_params(struct mgsl_struct *info);
+static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
+
+/*
+ * 1st function defined in .text section. Calling this function in
+ * init_module() followed by a breakpoint allows a remote debugger
+ * (gdb) to get the .text address for the add-symbol-file command.
+ * This allows remote debugging of dynamically loadable modules.
+ */
+static void* mgsl_get_text_ptr(void)
+{
+        return mgsl_get_text_ptr;
+}
+
+static inline int mgsl_paranoia_check(struct mgsl_struct *info,
+                                        char *name, const char *routine)
+{
+#ifdef MGSL_PARANOIA_CHECK
+        static const char *badmagic =
+                "Warning: bad magic number for mgsl struct (%s) in %s\n";
+        static const char *badinfo =
+                "Warning: null mgsl_struct for (%s) in %s\n";
+
+        if (!info) {
+                printk(badinfo, name, routine);
+                return 1;
+        }
+        if (info->magic != MGSL_MAGIC) {
+                printk(badmagic, name, routine);
+                return 1;
+        }
+#else
+        if (!info)
+                return 1;
+#endif
+        return 0;
+}
+
+/**
+ * line discipline callback wrappers
+ *
+ * The wrappers maintain line discipline references
+ * while calling into the line discipline.
+ *
+ * ldisc_receive_buf  - pass receive data to line discipline
+ */
+
+static void ldisc_receive_buf(struct tty_struct *tty,
+                              const __u8 *data, char *flags, int count)
+{
+        struct tty_ldisc *ld;
+        if (!tty)
+                return;
+        ld = tty_ldisc_ref(tty);
+        if (ld) {
+                if (ld->ops->receive_buf)
+                        ld->ops->receive_buf(tty, data, flags, count);
+                tty_ldisc_deref(ld);
+        }
+}
+
+/* mgsl_stop()          throttle (stop) transmitter
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ * Return Value:        None
+ */
+static void mgsl_stop(struct tty_struct *tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
+                return;
+        
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("mgsl_stop(%s)\n",info->device_name);    
+                
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if (info->tx_enabled)
+                usc_stop_transmitter(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+}       /* end of mgsl_stop() */
+
+/* mgsl_start()         release (start) transmitter
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ * Return Value:        None
+ */
+static void mgsl_start(struct tty_struct *tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
+                return;
+        
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("mgsl_start(%s)\n",info->device_name);   
+                
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if (!info->tx_enabled)
+                usc_start_transmitter(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+}       /* end of mgsl_start() */
+
+/*
+ * Bottom half work queue access functions
+ */
+
+/* mgsl_bh_action()     Return next bottom half action to perform.
+ * Return Value:        BH action code or 0 if nothing to do.
+ */
+static int mgsl_bh_action(struct mgsl_struct *info)
+{
+        unsigned long flags;
+        int rc = 0;
+        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+
+        if (info->pending_bh & BH_RECEIVE) {
+                info->pending_bh &= ~BH_RECEIVE;
+                rc = BH_RECEIVE;
+        } else if (info->pending_bh & BH_TRANSMIT) {
+                info->pending_bh &= ~BH_TRANSMIT;
+                rc = BH_TRANSMIT;
+        } else if (info->pending_bh & BH_STATUS) {
+                info->pending_bh &= ~BH_STATUS;
+                rc = BH_STATUS;
+        }
+
+        if (!rc) {
+                /* Mark BH routine as complete */
+                info->bh_running = false;
+                info->bh_requested = false;
+        }
+        
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+        return rc;
+}
+
+/*
+ *      Perform bottom half processing of work items queued by ISR.
+ */
+static void mgsl_bh_handler(struct work_struct *work)
+{
+        struct mgsl_struct *info =
+                container_of(work, struct mgsl_struct, task);
+        int action;
+
+        if (!info)
+                return;
+                
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
+                        __FILE__,__LINE__,info->device_name);
+        
+        info->bh_running = true;
+
+        while((action = mgsl_bh_action(info)) != 0) {
+        
+                /* Process work item */
+                if ( debug_level >= DEBUG_LEVEL_BH )
+                        printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
+                                __FILE__,__LINE__,action);
+
+                switch (action) {
+                
+                case BH_RECEIVE:
+                        mgsl_bh_receive(info);
+                        break;
+                case BH_TRANSMIT:
+                        mgsl_bh_transmit(info);
+                        break;
+                case BH_STATUS:
+                        mgsl_bh_status(info);
+                        break;
+                default:
+                        /* unknown work item ID */
+                        printk("Unknown work item ID=%08X!\n", action);
+                        break;
+                }
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
+                        __FILE__,__LINE__,info->device_name);
+}
+
+static void mgsl_bh_receive(struct mgsl_struct *info)
+{
+        bool (*get_rx_frame)(struct mgsl_struct *info) =
+                (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
+
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):mgsl_bh_receive(%s)\n",
+                        __FILE__,__LINE__,info->device_name);
+        
+        do
+        {
+                if (info->rx_rcc_underrun) {
+                        unsigned long flags;
+                        spin_lock_irqsave(&info->irq_spinlock,flags);
+                        usc_start_receiver(info);
+                        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                        return;
+                }
+        } while(get_rx_frame(info));
+}
+
+static void mgsl_bh_transmit(struct mgsl_struct *info)
+{
+        struct tty_struct *tty = info->port.tty;
+        unsigned long flags;
+        
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        if (tty)
+                tty_wakeup(tty);
+
+        /* if transmitter idle and loopmode_send_done_requested
+         * then start echoing RxD to TxD
+         */
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if ( !info->tx_active && info->loopmode_send_done_requested )
+                usc_loopmode_send_done( info );
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+}
+
+static void mgsl_bh_status(struct mgsl_struct *info)
+{
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):mgsl_bh_status() entry on %s\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        info->ri_chkcount = 0;
+        info->dsr_chkcount = 0;
+        info->dcd_chkcount = 0;
+        info->cts_chkcount = 0;
+}
+
+/* mgsl_isr_receive_status()
+ * 
+ *      Service a receive status interrupt. The type of status
+ *      interrupt is indicated by the state of the RCSR.
+ *      This is only used for HDLC mode.
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_isr_receive_status( struct mgsl_struct *info )
+{
+        u16 status = usc_InReg( info, RCSR );
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
+                        __FILE__,__LINE__,status);
+                        
+        if ( (status & RXSTATUS_ABORT_RECEIVED) && 
+                info->loopmode_insert_requested &&
+                usc_loopmode_active(info) )
+        {
+                ++info->icount.rxabort;
+                info->loopmode_insert_requested = false;
+ 
+                /* clear CMR:13 to start echoing RxD to TxD */
+                info->cmr_value &= ~BIT13;
+                usc_OutReg(info, CMR, info->cmr_value);
+ 
+                /* disable received abort irq (no longer required) */
+                usc_OutReg(info, RICR,
+                        (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
+        }
+
+        if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
+                if (status & RXSTATUS_EXITED_HUNT)
+                        info->icount.exithunt++;
+                if (status & RXSTATUS_IDLE_RECEIVED)
+                        info->icount.rxidle++;
+                wake_up_interruptible(&info->event_wait_q);
+        }
+
+        if (status & RXSTATUS_OVERRUN){
+                info->icount.rxover++;
+                usc_process_rxoverrun_sync( info );
+        }
+
+        usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
+        usc_UnlatchRxstatusBits( info, status );
+
+}       /* end of mgsl_isr_receive_status() */
+
+/* mgsl_isr_transmit_status()
+ * 
+ *      Service a transmit status interrupt
+ *      HDLC mode :end of transmit frame
+ *      Async mode:all data is sent
+ *      transmit status is indicated by bits in the TCSR.
+ * 
+ * Arguments:           info           pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_isr_transmit_status( struct mgsl_struct *info )
+{
+        u16 status = usc_InReg( info, TCSR );
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
+                        __FILE__,__LINE__,status);
+        
+        usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
+        usc_UnlatchTxstatusBits( info, status );
+        
+        if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
+        {
+                /* finished sending HDLC abort. This may leave  */
+                /* the TxFifo with data from the aborted frame  */
+                /* so purge the TxFifo. Also shutdown the DMA   */
+                /* channel in case there is data remaining in   */
+                /* the DMA buffer                               */
+                usc_DmaCmd( info, DmaCmd_ResetTxChannel );
+                usc_RTCmd( info, RTCmd_PurgeTxFifo );
+        }
+ 
+        if ( status & TXSTATUS_EOF_SENT )
+                info->icount.txok++;
+        else if ( status & TXSTATUS_UNDERRUN )
+                info->icount.txunder++;
+        else if ( status & TXSTATUS_ABORT_SENT )
+                info->icount.txabort++;
+        else
+                info->icount.txunder++;
+                        
+        info->tx_active = false;
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+        del_timer(&info->tx_timer);     
+        
+        if ( info->drop_rts_on_tx_done ) {
+                usc_get_serial_signals( info );
+                if ( info->serial_signals & SerialSignal_RTS ) {
+                        info->serial_signals &= ~SerialSignal_RTS;
+                        usc_set_serial_signals( info );
+                }
+                info->drop_rts_on_tx_done = false;
+        }
+
+#if SYNCLINK_GENERIC_HDLC
+        if (info->netcount)
+                hdlcdev_tx_done(info);
+        else 
+#endif
+        {
+                if (info->port.tty->stopped || info->port.tty->hw_stopped) {
+                        usc_stop_transmitter(info);
+                        return;
+                }
+                info->pending_bh |= BH_TRANSMIT;
+        }
+
+}       /* end of mgsl_isr_transmit_status() */
+
+/* mgsl_isr_io_pin()
+ * 
+ *      Service an Input/Output pin interrupt. The type of
+ *      interrupt is indicated by bits in the MISR
+ *      
+ * Arguments:           info           pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_isr_io_pin( struct mgsl_struct *info )
+{
+        struct  mgsl_icount *icount;
+        u16 status = usc_InReg( info, MISR );
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
+                        __FILE__,__LINE__,status);
+                        
+        usc_ClearIrqPendingBits( info, IO_PIN );
+        usc_UnlatchIostatusBits( info, status );
+
+        if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
+                      MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
+                icount = &info->icount;
+                /* update input line counters */
+                if (status & MISCSTATUS_RI_LATCHED) {
+                        if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
+                                usc_DisablestatusIrqs(info,SICR_RI);
+                        icount->rng++;
+                        if ( status & MISCSTATUS_RI )
+                                info->input_signal_events.ri_up++;      
+                        else
+                                info->input_signal_events.ri_down++;    
+                }
+                if (status & MISCSTATUS_DSR_LATCHED) {
+                        if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
+                                usc_DisablestatusIrqs(info,SICR_DSR);
+                        icount->dsr++;
+                        if ( status & MISCSTATUS_DSR )
+                                info->input_signal_events.dsr_up++;
+                        else
+                                info->input_signal_events.dsr_down++;
+                }
+                if (status & MISCSTATUS_DCD_LATCHED) {
+                        if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
+                                usc_DisablestatusIrqs(info,SICR_DCD);
+                        icount->dcd++;
+                        if (status & MISCSTATUS_DCD) {
+                                info->input_signal_events.dcd_up++;
+                        } else
+                                info->input_signal_events.dcd_down++;
+#if SYNCLINK_GENERIC_HDLC
+                        if (info->netcount) {
+                                if (status & MISCSTATUS_DCD)
+                                        netif_carrier_on(info->netdev);
+                                else
+                                        netif_carrier_off(info->netdev);
+                        }
+#endif
+                }
+                if (status & MISCSTATUS_CTS_LATCHED)
+                {
+                        if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
+                                usc_DisablestatusIrqs(info,SICR_CTS);
+                        icount->cts++;
+                        if ( status & MISCSTATUS_CTS )
+                                info->input_signal_events.cts_up++;
+                        else
+                                info->input_signal_events.cts_down++;
+                }
+                wake_up_interruptible(&info->status_event_wait_q);
+                wake_up_interruptible(&info->event_wait_q);
+
+                if ( (info->port.flags & ASYNC_CHECK_CD) && 
+                     (status & MISCSTATUS_DCD_LATCHED) ) {
+                        if ( debug_level >= DEBUG_LEVEL_ISR )
+                                printk("%s CD now %s...", info->device_name,
+                                       (status & MISCSTATUS_DCD) ? "on" : "off");
+                        if (status & MISCSTATUS_DCD)
+                                wake_up_interruptible(&info->port.open_wait);
+                        else {
+                                if ( debug_level >= DEBUG_LEVEL_ISR )
+                                        printk("doing serial hangup...");
+                                if (info->port.tty)
+                                        tty_hangup(info->port.tty);
+                        }
+                }
+        
+                if ( (info->port.flags & ASYNC_CTS_FLOW) && 
+                     (status & MISCSTATUS_CTS_LATCHED) ) {
+                        if (info->port.tty->hw_stopped) {
+                                if (status & MISCSTATUS_CTS) {
+                                        if ( debug_level >= DEBUG_LEVEL_ISR )
+                                                printk("CTS tx start...");
+                                        if (info->port.tty)
+                                                info->port.tty->hw_stopped = 0;
+                                        usc_start_transmitter(info);
+                                        info->pending_bh |= BH_TRANSMIT;
+                                        return;
+                                }
+                        } else {
+                                if (!(status & MISCSTATUS_CTS)) {
+                                        if ( debug_level >= DEBUG_LEVEL_ISR )
+                                                printk("CTS tx stop...");
+                                        if (info->port.tty)
+                                                info->port.tty->hw_stopped = 1;
+                                        usc_stop_transmitter(info);
+                                }
+                        }
+                }
+        }
+
+        info->pending_bh |= BH_STATUS;
+        
+        /* for diagnostics set IRQ flag */
+        if ( status & MISCSTATUS_TXC_LATCHED ){
+                usc_OutReg( info, SICR,
+                        (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
+                usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
+                info->irq_occurred = true;
+        }
+
+}       /* end of mgsl_isr_io_pin() */
+
+/* mgsl_isr_transmit_data()
+ * 
+ *      Service a transmit data interrupt (async mode only).
+ * 
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_isr_transmit_data( struct mgsl_struct *info )
+{
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
+                        __FILE__,__LINE__,info->xmit_cnt);
+                        
+        usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
+        
+        if (info->port.tty->stopped || info->port.tty->hw_stopped) {
+                usc_stop_transmitter(info);
+                return;
+        }
+        
+        if ( info->xmit_cnt )
+                usc_load_txfifo( info );
+        else
+                info->tx_active = false;
+                
+        if (info->xmit_cnt < WAKEUP_CHARS)
+                info->pending_bh |= BH_TRANSMIT;
+
+}       /* end of mgsl_isr_transmit_data() */
+
+/* mgsl_isr_receive_data()
+ * 
+ *      Service a receive data interrupt. This occurs
+ *      when operating in asynchronous interrupt transfer mode.
+ *      The receive data FIFO is flushed to the receive data buffers. 
+ * 
+ * Arguments:           info            pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_isr_receive_data( struct mgsl_struct *info )
+{
+        int Fifocount;
+        u16 status;
+        int work = 0;
+        unsigned char DataByte;
+        struct tty_struct *tty = info->port.tty;
+        struct  mgsl_icount *icount = &info->icount;
+        
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk("%s(%d):mgsl_isr_receive_data\n",
+                        __FILE__,__LINE__);
+
+        usc_ClearIrqPendingBits( info, RECEIVE_DATA );
+        
+        /* select FIFO status for RICR readback */
+        usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
+
+        /* clear the Wordstatus bit so that status readback */
+        /* only reflects the status of this byte */
+        usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
+
+        /* flush the receive FIFO */
+
+        while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
+                int flag;
+
+                /* read one byte from RxFIFO */
+                outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
+                      info->io_base + CCAR );
+                DataByte = inb( info->io_base + CCAR );
+
+                /* get the status of the received byte */
+                status = usc_InReg(info, RCSR);
+                if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
+                                RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
+                        usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
+                
+                icount->rx++;
+                
+                flag = 0;
+                if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
+                                RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
+                        printk("rxerr=%04X\n",status);                                  
+                        /* update error statistics */
+                        if ( status & RXSTATUS_BREAK_RECEIVED ) {
+                                status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
+                                icount->brk++;
+                        } else if (status & RXSTATUS_PARITY_ERROR) 
+                                icount->parity++;
+                        else if (status & RXSTATUS_FRAMING_ERROR)
+                                icount->frame++;
+                        else if (status & RXSTATUS_OVERRUN) {
+                                /* must issue purge fifo cmd before */
+                                /* 16C32 accepts more receive chars */
+                                usc_RTCmd(info,RTCmd_PurgeRxFifo);
+                                icount->overrun++;
+                        }
+
+                        /* discard char if tty control flags say so */                                  
+                        if (status & info->ignore_status_mask)
+                                continue;
+                                
+                        status &= info->read_status_mask;
+                
+                        if (status & RXSTATUS_BREAK_RECEIVED) {
+                                flag = TTY_BREAK;
+                                if (info->port.flags & ASYNC_SAK)
+                                        do_SAK(tty);
+                        } else if (status & RXSTATUS_PARITY_ERROR)
+                                flag = TTY_PARITY;
+                        else if (status & RXSTATUS_FRAMING_ERROR)
+                                flag = TTY_FRAME;
+                }       /* end of if (error) */
+                tty_insert_flip_char(tty, DataByte, flag);
+                if (status & RXSTATUS_OVERRUN) {
+                        /* Overrun is special, since it's
+                         * reported immediately, and doesn't
+                         * affect the current character
+                         */
+                        work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                }
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_ISR ) {
+                printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
+                        __FILE__,__LINE__,icount->rx,icount->brk,
+                        icount->parity,icount->frame,icount->overrun);
+        }
+                        
+        if(work)
+                tty_flip_buffer_push(tty);
+}
+
+/* mgsl_isr_misc()
+ * 
+ *      Service a miscellaneous interrupt source.
+ *      
+ * Arguments:           info            pointer to device extension (instance data)
+ * Return Value:        None
+ */
+static void mgsl_isr_misc( struct mgsl_struct *info )
+{
+        u16 status = usc_InReg( info, MISR );
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk("%s(%d):mgsl_isr_misc status=%04X\n",
+                        __FILE__,__LINE__,status);
+                        
+        if ((status & MISCSTATUS_RCC_UNDERRUN) &&
+            (info->params.mode == MGSL_MODE_HDLC)) {
+
+                /* turn off receiver and rx DMA */
+                usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
+                usc_DmaCmd(info, DmaCmd_ResetRxChannel);
+                usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
+                usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
+                usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
+
+                /* schedule BH handler to restart receiver */
+                info->pending_bh |= BH_RECEIVE;
+                info->rx_rcc_underrun = true;
+        }
+
+        usc_ClearIrqPendingBits( info, MISC );
+        usc_UnlatchMiscstatusBits( info, status );
+
+}       /* end of mgsl_isr_misc() */
+
+/* mgsl_isr_null()
+ *
+ *      Services undefined interrupt vectors from the
+ *      USC. (hence this function SHOULD never be called)
+ * 
+ * Arguments:           info            pointer to device extension (instance data)
+ * Return Value:        None
+ */
+static void mgsl_isr_null( struct mgsl_struct *info )
+{
+
+}       /* end of mgsl_isr_null() */
+
+/* mgsl_isr_receive_dma()
+ * 
+ *      Service a receive DMA channel interrupt.
+ *      For this driver there are two sources of receive DMA interrupts
+ *      as identified in the Receive DMA mode Register (RDMR):
+ * 
+ *      BIT3    EOA/EOL         End of List, all receive buffers in receive
+ *                              buffer list have been filled (no more free buffers
+ *                              available). The DMA controller has shut down.
+ * 
+ *      BIT2    EOB             End of Buffer. This interrupt occurs when a receive
+ *                              DMA buffer is terminated in response to completion
+ *                              of a good frame or a frame with errors. The status
+ *                              of the frame is stored in the buffer entry in the
+ *                              list of receive buffer entries.
+ * 
+ * Arguments:           info            pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_isr_receive_dma( struct mgsl_struct *info )
+{
+        u16 status;
+        
+        /* clear interrupt pending and IUS bit for Rx DMA IRQ */
+        usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
+
+        /* Read the receive DMA status to identify interrupt type. */
+        /* This also clears the status bits. */
+        status = usc_InDmaReg( info, RDMR );
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
+                        __FILE__,__LINE__,info->device_name,status);
+                        
+        info->pending_bh |= BH_RECEIVE;
+        
+        if ( status & BIT3 ) {
+                info->rx_overflow = true;
+                info->icount.buf_overrun++;
+        }
+
+}       /* end of mgsl_isr_receive_dma() */
+
+/* mgsl_isr_transmit_dma()
+ *
+ *      This function services a transmit DMA channel interrupt.
+ *
+ *      For this driver there is one source of transmit DMA interrupts
+ *      as identified in the Transmit DMA Mode Register (TDMR):
+ *
+ *      BIT2  EOB       End of Buffer. This interrupt occurs when a
+ *                      transmit DMA buffer has been emptied.
+ *
+ *      The driver maintains enough transmit DMA buffers to hold at least
+ *      one max frame size transmit frame. When operating in a buffered
+ *      transmit mode, there may be enough transmit DMA buffers to hold at
+ *      least two or more max frame size frames. On an EOB condition,
+ *      determine if there are any queued transmit buffers and copy into
+ *      transmit DMA buffers if we have room.
+ *
+ * Arguments:           info            pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
+{
+        u16 status;
+
+        /* clear interrupt pending and IUS bit for Tx DMA IRQ */
+        usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
+
+        /* Read the transmit DMA status to identify interrupt type. */
+        /* This also clears the status bits. */
+
+        status = usc_InDmaReg( info, TDMR );
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
+                        __FILE__,__LINE__,info->device_name,status);
+
+        if ( status & BIT2 ) {
+                --info->tx_dma_buffers_used;
+
+                /* if there are transmit frames queued,
+                 *  try to load the next one
+                 */
+                if ( load_next_tx_holding_buffer(info) ) {
+                        /* if call returns non-zero value, we have
+                         * at least one free tx holding buffer
+                         */
+                        info->pending_bh |= BH_TRANSMIT;
+                }
+        }
+
+}       /* end of mgsl_isr_transmit_dma() */
+
+/* mgsl_interrupt()
+ * 
+ *      Interrupt service routine entry point.
+ *      
+ * Arguments:
+ * 
+ *      irq             interrupt number that caused interrupt
+ *      dev_id          device ID supplied during interrupt registration
+ *      
+ * Return Value: None
+ */
+static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
+{
+        struct mgsl_struct *info = dev_id;
+        u16 UscVector;
+        u16 DmaVector;
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
+                        __FILE__, __LINE__, info->irq_level);
+
+        spin_lock(&info->irq_spinlock);
+
+        for(;;) {
+                /* Read the interrupt vectors from hardware. */
+                UscVector = usc_InReg(info, IVR) >> 9;
+                DmaVector = usc_InDmaReg(info, DIVR);
+                
+                if ( debug_level >= DEBUG_LEVEL_ISR )   
+                        printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
+                                __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
+                        
+                if ( !UscVector && !DmaVector )
+                        break;
+                        
+                /* Dispatch interrupt vector */
+                if ( UscVector )
+                        (*UscIsrTable[UscVector])(info);
+                else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
+                        mgsl_isr_transmit_dma(info);
+                else
+                        mgsl_isr_receive_dma(info);
+
+                if ( info->isr_overflow ) {
+                        printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
+                                __FILE__, __LINE__, info->device_name, info->irq_level);
+                        usc_DisableMasterIrqBit(info);
+                        usc_DisableDmaInterrupts(info,DICR_MASTER);
+                        break;
+                }
+        }
+        
+        /* Request bottom half processing if there's something 
+         * for it to do and the bh is not already running
+         */
+
+        if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
+                if ( debug_level >= DEBUG_LEVEL_ISR )   
+                        printk("%s(%d):%s queueing bh task.\n",
+                                __FILE__,__LINE__,info->device_name);
+                schedule_work(&info->task);
+                info->bh_requested = true;
+        }
+
+        spin_unlock(&info->irq_spinlock);
+        
+        if ( debug_level >= DEBUG_LEVEL_ISR )   
+                printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
+                        __FILE__, __LINE__, info->irq_level);
+
+        return IRQ_HANDLED;
+}       /* end of mgsl_interrupt() */
+
+/* startup()
+ * 
+ *      Initialize and start device.
+ *      
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        0 if success, otherwise error code
+ */
+static int startup(struct mgsl_struct * info)
+{
+        int retval = 0;
+        
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
+                
+        if (info->port.flags & ASYNC_INITIALIZED)
+                return 0;
+        
+        if (!info->xmit_buf) {
+                /* allocate a page of memory for a transmit buffer */
+                info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
+                if (!info->xmit_buf) {
+                        printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
+                                __FILE__,__LINE__,info->device_name);
+                        return -ENOMEM;
+                }
+        }
+
+        info->pending_bh = 0;
+        
+        memset(&info->icount, 0, sizeof(info->icount));
+
+        setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
+        
+        /* Allocate and claim adapter resources */
+        retval = mgsl_claim_resources(info);
+        
+        /* perform existence check and diagnostics */
+        if ( !retval )
+                retval = mgsl_adapter_test(info);
+                
+        if ( retval ) {
+                if (capable(CAP_SYS_ADMIN) && info->port.tty)
+                        set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+                mgsl_release_resources(info);
+                return retval;
+        }
+
+        /* program hardware for current parameters */
+        mgsl_change_params(info);
+        
+        if (info->port.tty)
+                clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->port.flags |= ASYNC_INITIALIZED;
+        
+        return 0;
+        
+}       /* end of startup() */
+
+/* shutdown()
+ *
+ * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void shutdown(struct mgsl_struct * info)
+{
+        unsigned long flags;
+        
+        if (!(info->port.flags & ASYNC_INITIALIZED))
+                return;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_shutdown(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        /* clear status wait queue because status changes */
+        /* can't happen after shutting down the hardware */
+        wake_up_interruptible(&info->status_event_wait_q);
+        wake_up_interruptible(&info->event_wait_q);
+
+        del_timer_sync(&info->tx_timer);
+
+        if (info->xmit_buf) {
+                free_page((unsigned long) info->xmit_buf);
+                info->xmit_buf = NULL;
+        }
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_DisableMasterIrqBit(info);
+        usc_stop_receiver(info);
+        usc_stop_transmitter(info);
+        usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
+                TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
+        usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
+        
+        /* Disable DMAEN (Port 7, Bit 14) */
+        /* This disconnects the DMA request signal from the ISA bus */
+        /* on the ISA adapter. This has no effect for the PCI adapter */
+        usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
+        
+        /* Disable INTEN (Port 6, Bit12) */
+        /* This disconnects the IRQ request signal to the ISA bus */
+        /* on the ISA adapter. This has no effect for the PCI adapter */
+        usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
+        
+        if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
+                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                usc_set_serial_signals(info);
+        }
+        
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        mgsl_release_resources(info);   
+        
+        if (info->port.tty)
+                set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->port.flags &= ~ASYNC_INITIALIZED;
+        
+}       /* end of shutdown() */
+
+static void mgsl_program_hw(struct mgsl_struct *info)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        
+        usc_stop_receiver(info);
+        usc_stop_transmitter(info);
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+        
+        if (info->params.mode == MGSL_MODE_HDLC ||
+            info->params.mode == MGSL_MODE_RAW ||
+            info->netcount)
+                usc_set_sync_mode(info);
+        else
+                usc_set_async_mode(info);
+                
+        usc_set_serial_signals(info);
+        
+        info->dcd_chkcount = 0;
+        info->cts_chkcount = 0;
+        info->ri_chkcount = 0;
+        info->dsr_chkcount = 0;
+
+        usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);          
+        usc_EnableInterrupts(info, IO_PIN);
+        usc_get_serial_signals(info);
+                
+        if (info->netcount || info->port.tty->termios->c_cflag & CREAD)
+                usc_start_receiver(info);
+                
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+}
+
+/* Reconfigure adapter based on new parameters
+ */
+static void mgsl_change_params(struct mgsl_struct *info)
+{
+        unsigned cflag;
+        int bits_per_char;
+
+        if (!info->port.tty || !info->port.tty->termios)
+                return;
+                
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_change_params(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+                         
+        cflag = info->port.tty->termios->c_cflag;
+
+        /* if B0 rate (hangup) specified then negate DTR and RTS */
+        /* otherwise assert DTR and RTS */
+        if (cflag & CBAUD)
+                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        else
+                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+        
+        /* byte size and parity */
+        
+        switch (cflag & CSIZE) {
+              case CS5: info->params.data_bits = 5; break;
+              case CS6: info->params.data_bits = 6; break;
+              case CS7: info->params.data_bits = 7; break;
+              case CS8: info->params.data_bits = 8; break;
+              /* Never happens, but GCC is too dumb to figure it out */
+              default:  info->params.data_bits = 7; break;
+              }
+              
+        if (cflag & CSTOPB)
+                info->params.stop_bits = 2;
+        else
+                info->params.stop_bits = 1;
+
+        info->params.parity = ASYNC_PARITY_NONE;
+        if (cflag & PARENB) {
+                if (cflag & PARODD)
+                        info->params.parity = ASYNC_PARITY_ODD;
+                else
+                        info->params.parity = ASYNC_PARITY_EVEN;
+#ifdef CMSPAR
+                if (cflag & CMSPAR)
+                        info->params.parity = ASYNC_PARITY_SPACE;
+#endif
+        }
+
+        /* calculate number of jiffies to transmit a full
+         * FIFO (32 bytes) at specified data rate
+         */
+        bits_per_char = info->params.data_bits + 
+                        info->params.stop_bits + 1;
+
+        /* if port data rate is set to 460800 or less then
+         * allow tty settings to override, otherwise keep the
+         * current data rate.
+         */
+        if (info->params.data_rate <= 460800)
+                info->params.data_rate = tty_get_baud_rate(info->port.tty);
+        
+        if ( info->params.data_rate ) {
+                info->timeout = (32*HZ*bits_per_char) / 
+                                info->params.data_rate;
+        }
+        info->timeout += HZ/50;         /* Add .02 seconds of slop */
+
+        if (cflag & CRTSCTS)
+                info->port.flags |= ASYNC_CTS_FLOW;
+        else
+                info->port.flags &= ~ASYNC_CTS_FLOW;
+                
+        if (cflag & CLOCAL)
+                info->port.flags &= ~ASYNC_CHECK_CD;
+        else
+                info->port.flags |= ASYNC_CHECK_CD;
+
+        /* process tty input control flags */
+        
+        info->read_status_mask = RXSTATUS_OVERRUN;
+        if (I_INPCK(info->port.tty))
+                info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
+        if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
+                info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
+        
+        if (I_IGNPAR(info->port.tty))
+                info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
+        if (I_IGNBRK(info->port.tty)) {
+                info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
+                /* If ignoring parity and break indicators, ignore 
+                 * overruns too.  (For real raw support).
+                 */
+                if (I_IGNPAR(info->port.tty))
+                        info->ignore_status_mask |= RXSTATUS_OVERRUN;
+        }
+
+        mgsl_program_hw(info);
+
+}       /* end of mgsl_change_params() */
+
+/* mgsl_put_char()
+ * 
+ *      Add a character to the transmit buffer.
+ *      
+ * Arguments:           tty     pointer to tty information structure
+ *                      ch      character to add to transmit buffer
+ *              
+ * Return Value:        None
+ */
+static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        int ret = 0;
+
+        if (debug_level >= DEBUG_LEVEL_INFO) {
+                printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
+                        __FILE__, __LINE__, ch, info->device_name);
+        }               
+        
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
+                return 0;
+
+        if (!info->xmit_buf)
+                return 0;
+
+        spin_lock_irqsave(&info->irq_spinlock, flags);
+        
+        if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
+                if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
+                        info->xmit_buf[info->xmit_head++] = ch;
+                        info->xmit_head &= SERIAL_XMIT_SIZE-1;
+                        info->xmit_cnt++;
+                        ret = 1;
+                }
+        }
+        spin_unlock_irqrestore(&info->irq_spinlock, flags);
+        return ret;
+        
+}       /* end of mgsl_put_char() */
+
+/* mgsl_flush_chars()
+ * 
+ *      Enable transmitter so remaining characters in the
+ *      transmit buffer are sent.
+ *      
+ * Arguments:           tty     pointer to tty information structure
+ * Return Value:        None
+ */
+static void mgsl_flush_chars(struct tty_struct *tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+                                
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
+                        __FILE__,__LINE__,info->device_name,info->xmit_cnt);
+        
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
+                return;
+
+        if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+            !info->xmit_buf)
+                return;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
+                        __FILE__,__LINE__,info->device_name );
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        
+        if (!info->tx_active) {
+                if ( (info->params.mode == MGSL_MODE_HDLC ||
+                        info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
+                        /* operating in synchronous (frame oriented) mode */
+                        /* copy data from circular xmit_buf to */
+                        /* transmit DMA buffer. */
+                        mgsl_load_tx_dma_buffer(info,
+                                 info->xmit_buf,info->xmit_cnt);
+                }
+                usc_start_transmitter(info);
+        }
+        
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+}       /* end of mgsl_flush_chars() */
+
+/* mgsl_write()
+ * 
+ *      Send a block of data
+ *      
+ * Arguments:
+ * 
+ *      tty             pointer to tty information structure
+ *      buf             pointer to buffer containing send data
+ *      count           size of send data in bytes
+ *      
+ * Return Value:        number of characters written
+ */
+static int mgsl_write(struct tty_struct * tty,
+                    const unsigned char *buf, int count)
+{
+        int     c, ret = 0;
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):mgsl_write(%s) count=%d\n",
+                        __FILE__,__LINE__,info->device_name,count);
+        
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
+                goto cleanup;
+
+        if (!info->xmit_buf)
+                goto cleanup;
+
+        if ( info->params.mode == MGSL_MODE_HDLC ||
+                        info->params.mode == MGSL_MODE_RAW ) {
+                /* operating in synchronous (frame oriented) mode */
+                /* operating in synchronous (frame oriented) mode */
+                if (info->tx_active) {
+
+                        if ( info->params.mode == MGSL_MODE_HDLC ) {
+                                ret = 0;
+                                goto cleanup;
+                        }
+                        /* transmitter is actively sending data -
+                         * if we have multiple transmit dma and
+                         * holding buffers, attempt to queue this
+                         * frame for transmission at a later time.
+                         */
+                        if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
+                                /* no tx holding buffers available */
+                                ret = 0;
+                                goto cleanup;
+                        }
+
+                        /* queue transmit frame request */
+                        ret = count;
+                        save_tx_buffer_request(info,buf,count);
+
+                        /* if we have sufficient tx dma buffers,
+                         * load the next buffered tx request
+                         */
+                        spin_lock_irqsave(&info->irq_spinlock,flags);
+                        load_next_tx_holding_buffer(info);
+                        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                        goto cleanup;
+                }
+        
+                /* if operating in HDLC LoopMode and the adapter  */
+                /* has yet to be inserted into the loop, we can't */
+                /* transmit                                       */
+
+                if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
+                        !usc_loopmode_active(info) )
+                {
+                        ret = 0;
+                        goto cleanup;
+                }
+
+                if ( info->xmit_cnt ) {
+                        /* Send accumulated from send_char() calls */
+                        /* as frame and wait before accepting more data. */
+                        ret = 0;
+                        
+                        /* copy data from circular xmit_buf to */
+                        /* transmit DMA buffer. */
+                        mgsl_load_tx_dma_buffer(info,
+                                info->xmit_buf,info->xmit_cnt);
+                        if ( debug_level >= DEBUG_LEVEL_INFO )
+                                printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
+                                        __FILE__,__LINE__,info->device_name);
+                } else {
+                        if ( debug_level >= DEBUG_LEVEL_INFO )
+                                printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
+                                        __FILE__,__LINE__,info->device_name);
+                        ret = count;
+                        info->xmit_cnt = count;
+                        mgsl_load_tx_dma_buffer(info,buf,count);
+                }
+        } else {
+                while (1) {
+                        spin_lock_irqsave(&info->irq_spinlock,flags);
+                        c = min_t(int, count,
+                                min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+                                    SERIAL_XMIT_SIZE - info->xmit_head));
+                        if (c <= 0) {
+                                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                                break;
+                        }
+                        memcpy(info->xmit_buf + info->xmit_head, buf, c);
+                        info->xmit_head = ((info->xmit_head + c) &
+                                           (SERIAL_XMIT_SIZE-1));
+                        info->xmit_cnt += c;
+                        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                        buf += c;
+                        count -= c;
+                        ret += c;
+                }
+        }       
+        
+        if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                if (!info->tx_active)
+                        usc_start_transmitter(info);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        }
+cleanup:        
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):mgsl_write(%s) returning=%d\n",
+                        __FILE__,__LINE__,info->device_name,ret);
+                        
+        return ret;
+        
+}       /* end of mgsl_write() */
+
+/* mgsl_write_room()
+ *
+ *      Return the count of free bytes in transmit buffer
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ * Return Value:        None
+ */
+static int mgsl_write_room(struct tty_struct *tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        int     ret;
+                                
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
+                return 0;
+        ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+        if (ret < 0)
+                ret = 0;
+                
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_write_room(%s)=%d\n",
+                         __FILE__,__LINE__, info->device_name,ret );
+                         
+        if ( info->params.mode == MGSL_MODE_HDLC ||
+                info->params.mode == MGSL_MODE_RAW ) {
+                /* operating in synchronous (frame oriented) mode */
+                if ( info->tx_active )
+                        return 0;
+                else
+                        return HDLC_MAX_FRAME_SIZE;
+        }
+        
+        return ret;
+        
+}       /* end of mgsl_write_room() */
+
+/* mgsl_chars_in_buffer()
+ *
+ *      Return the count of bytes in transmit buffer
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ * Return Value:        None
+ */
+static int mgsl_chars_in_buffer(struct tty_struct *tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+                         
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+                         
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
+                return 0;
+                
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
+                         __FILE__,__LINE__, info->device_name,info->xmit_cnt );
+                         
+        if ( info->params.mode == MGSL_MODE_HDLC ||
+                info->params.mode == MGSL_MODE_RAW ) {
+                /* operating in synchronous (frame oriented) mode */
+                if ( info->tx_active )
+                        return info->max_frame_size;
+                else
+                        return 0;
+        }
+                         
+        return info->xmit_cnt;
+}       /* end of mgsl_chars_in_buffer() */
+
+/* mgsl_flush_buffer()
+ *
+ *      Discard all data in the send buffer
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ * Return Value:        None
+ */
+static void mgsl_flush_buffer(struct tty_struct *tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
+                         __FILE__,__LINE__, info->device_name );
+        
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
+                return;
+                
+        spin_lock_irqsave(&info->irq_spinlock,flags); 
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+        del_timer(&info->tx_timer);     
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+        tty_wakeup(tty);
+}
+
+/* mgsl_send_xchar()
+ *
+ *      Send a high-priority XON/XOFF character
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ *                      ch      character to send
+ * Return Value:        None
+ */
+static void mgsl_send_xchar(struct tty_struct *tty, char ch)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
+                         __FILE__,__LINE__, info->device_name, ch );
+                         
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
+                return;
+
+        info->x_char = ch;
+        if (ch) {
+                /* Make sure transmit interrupts are on */
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                if (!info->tx_enabled)
+                        usc_start_transmitter(info);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        }
+}       /* end of mgsl_send_xchar() */
+
+/* mgsl_throttle()
+ * 
+ *      Signal remote device to throttle send data (our receive data)
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ * Return Value:        None
+ */
+static void mgsl_throttle(struct tty_struct * tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_throttle(%s) entry\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
+                return;
+        
+        if (I_IXOFF(tty))
+                mgsl_send_xchar(tty, STOP_CHAR(tty));
+ 
+        if (tty->termios->c_cflag & CRTSCTS) {
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                info->serial_signals &= ~SerialSignal_RTS;
+                usc_set_serial_signals(info);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        }
+}       /* end of mgsl_throttle() */
+
+/* mgsl_unthrottle()
+ * 
+ *      Signal remote device to stop throttling send data (our receive data)
+ *      
+ * Arguments:           tty     pointer to tty info structure
+ * Return Value:        None
+ */
+static void mgsl_unthrottle(struct tty_struct * tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_unthrottle(%s) entry\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
+                return;
+        
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        mgsl_send_xchar(tty, START_CHAR(tty));
+        }
+        
+        if (tty->termios->c_cflag & CRTSCTS) {
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                info->serial_signals |= SerialSignal_RTS;
+                usc_set_serial_signals(info);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        }
+        
+}       /* end of mgsl_unthrottle() */
+
+/* mgsl_get_stats()
+ * 
+ *      get the current serial parameters information
+ *
+ * Arguments:   info            pointer to device instance data
+ *              user_icount     pointer to buffer to hold returned stats
+ *      
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
+{
+        int err;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_get_params(%s)\n",
+                         __FILE__,__LINE__, info->device_name);
+                        
+        if (!user_icount) {
+                memset(&info->icount, 0, sizeof(info->icount));
+        } else {
+                mutex_lock(&info->port.mutex);
+                COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
+                mutex_unlock(&info->port.mutex);
+                if (err)
+                        return -EFAULT;
+        }
+        
+        return 0;
+        
+}       /* end of mgsl_get_stats() */
+
+/* mgsl_get_params()
+ * 
+ *      get the current serial parameters information
+ *
+ * Arguments:   info            pointer to device instance data
+ *              user_params     pointer to buffer to hold returned params
+ *      
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
+{
+        int err;
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_get_params(%s)\n",
+                         __FILE__,__LINE__, info->device_name);
+                        
+        mutex_lock(&info->port.mutex);
+        COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
+        mutex_unlock(&info->port.mutex);
+        if (err) {
+                if ( debug_level >= DEBUG_LEVEL_INFO )
+                        printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
+                                __FILE__,__LINE__,info->device_name);
+                return -EFAULT;
+        }
+        
+        return 0;
+        
+}       /* end of mgsl_get_params() */
+
+/* mgsl_set_params()
+ * 
+ *      set the serial parameters
+ *      
+ * Arguments:
+ * 
+ *      info            pointer to device instance data
+ *      new_params      user buffer containing new serial params
+ *
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
+{
+        unsigned long flags;
+        MGSL_PARAMS tmp_params;
+        int err;
+ 
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
+                        info->device_name );
+        COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
+        if (err) {
+                if ( debug_level >= DEBUG_LEVEL_INFO )
+                        printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
+                                __FILE__,__LINE__,info->device_name);
+                return -EFAULT;
+        }
+        
+        mutex_lock(&info->port.mutex);
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+        mgsl_change_params(info);
+        mutex_unlock(&info->port.mutex);
+        
+        return 0;
+        
+}       /* end of mgsl_set_params() */
+
+/* mgsl_get_txidle()
+ * 
+ *      get the current transmit idle mode
+ *
+ * Arguments:   info            pointer to device instance data
+ *              idle_mode       pointer to buffer to hold returned idle mode
+ *      
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
+{
+        int err;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
+                         __FILE__,__LINE__, info->device_name, info->idle_mode);
+                        
+        COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
+        if (err) {
+                if ( debug_level >= DEBUG_LEVEL_INFO )
+                        printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
+                                __FILE__,__LINE__,info->device_name);
+                return -EFAULT;
+        }
+        
+        return 0;
+        
+}       /* end of mgsl_get_txidle() */
+
+/* mgsl_set_txidle()    service ioctl to set transmit idle mode
+ *      
+ * Arguments:           info            pointer to device instance data
+ *                      idle_mode       new idle mode
+ *
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
+{
+        unsigned long flags;
+ 
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
+                        info->device_name, idle_mode );
+                        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        info->idle_mode = idle_mode;
+        usc_set_txidle( info );
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        return 0;
+        
+}       /* end of mgsl_set_txidle() */
+
+/* mgsl_txenable()
+ * 
+ *      enable or disable the transmitter
+ *      
+ * Arguments:
+ * 
+ *      info            pointer to device instance data
+ *      enable          1 = enable, 0 = disable
+ *
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_txenable(struct mgsl_struct * info, int enable)
+{
+        unsigned long flags;
+ 
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
+                        info->device_name, enable);
+                        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if ( enable ) {
+                if ( !info->tx_enabled ) {
+
+                        usc_start_transmitter(info);
+                        /*--------------------------------------------------
+                         * if HDLC/SDLC Loop mode, attempt to insert the
+                         * station in the 'loop' by setting CMR:13. Upon
+                         * receipt of the next GoAhead (RxAbort) sequence,
+                         * the OnLoop indicator (CCSR:7) should go active
+                         * to indicate that we are on the loop
+                         *--------------------------------------------------*/
+                        if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
+                                usc_loopmode_insert_request( info );
+                }
+        } else {
+                if ( info->tx_enabled )
+                        usc_stop_transmitter(info);
+        }
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        return 0;
+        
+}       /* end of mgsl_txenable() */
+
+/* mgsl_txabort()       abort send HDLC frame
+ *      
+ * Arguments:           info            pointer to device instance data
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_txabort(struct mgsl_struct * info)
+{
+        unsigned long flags;
+ 
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
+                        info->device_name);
+                        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
+        {
+                if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
+                        usc_loopmode_cancel_transmit( info );
+                else
+                        usc_TCmd(info,TCmd_SendAbort);
+        }
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        return 0;
+        
+}       /* end of mgsl_txabort() */
+
+/* mgsl_rxenable()      enable or disable the receiver
+ *      
+ * Arguments:           info            pointer to device instance data
+ *                      enable          1 = enable, 0 = disable
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_rxenable(struct mgsl_struct * info, int enable)
+{
+        unsigned long flags;
+ 
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
+                        info->device_name, enable);
+                        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if ( enable ) {
+                if ( !info->rx_enabled )
+                        usc_start_receiver(info);
+        } else {
+                if ( info->rx_enabled )
+                        usc_stop_receiver(info);
+        }
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        return 0;
+        
+}       /* end of mgsl_rxenable() */
+
+/* mgsl_wait_event()    wait for specified event to occur
+ *      
+ * Arguments:           info    pointer to device instance data
+ *                      mask    pointer to bitmask of events to wait for
+ * Return Value:        0       if successful and bit mask updated with
+ *                              of events triggerred,
+ *                      otherwise error code
+ */
+static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
+{
+        unsigned long flags;
+        int s;
+        int rc=0;
+        struct mgsl_icount cprev, cnow;
+        int events;
+        int mask;
+        struct  _input_signal_events oldsigs, newsigs;
+        DECLARE_WAITQUEUE(wait, current);
+
+        COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
+        if (rc) {
+                return  -EFAULT;
+        }
+                 
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
+                        info->device_name, mask);
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+
+        /* return immediately if state matches requested events */
+        usc_get_serial_signals(info);
+        s = info->serial_signals;
+        events = mask &
+                ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
+                  ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
+                  ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
+                  ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
+        if (events) {
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                goto exit;
+        }
+
+        /* save current irq counts */
+        cprev = info->icount;
+        oldsigs = info->input_signal_events;
+        
+        /* enable hunt and idle irqs if needed */
+        if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
+                u16 oldreg = usc_InReg(info,RICR);
+                u16 newreg = oldreg +
+                         (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
+                         (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
+                if (oldreg != newreg)
+                        usc_OutReg(info, RICR, newreg);
+        }
+        
+        set_current_state(TASK_INTERRUPTIBLE);
+        add_wait_queue(&info->event_wait_q, &wait);
+        
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+
+        for(;;) {
+                schedule();
+                if (signal_pending(current)) {
+                        rc = -ERESTARTSYS;
+                        break;
+                }
+                        
+                /* get current irq counts */
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                cnow = info->icount;
+                newsigs = info->input_signal_events;
+                set_current_state(TASK_INTERRUPTIBLE);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+                /* if no change, wait aborted for some reason */
+                if (newsigs.dsr_up   == oldsigs.dsr_up   &&
+                    newsigs.dsr_down == oldsigs.dsr_down &&
+                    newsigs.dcd_up   == oldsigs.dcd_up   &&
+                    newsigs.dcd_down == oldsigs.dcd_down &&
+                    newsigs.cts_up   == oldsigs.cts_up   &&
+                    newsigs.cts_down == oldsigs.cts_down &&
+                    newsigs.ri_up    == oldsigs.ri_up    &&
+                    newsigs.ri_down  == oldsigs.ri_down  &&
+                    cnow.exithunt    == cprev.exithunt   &&
+                    cnow.rxidle      == cprev.rxidle) {
+                        rc = -EIO;
+                        break;
+                }
+
+                events = mask &
+                        ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
+                        (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
+                        (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
+                        (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
+                        (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
+                        (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
+                        (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
+                        (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
+                        (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
+                          (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
+                if (events)
+                        break;
+                
+                cprev = cnow;
+                oldsigs = newsigs;
+        }
+        
+        remove_wait_queue(&info->event_wait_q, &wait);
+        set_current_state(TASK_RUNNING);
+
+        if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                if (!waitqueue_active(&info->event_wait_q)) {
+                        /* disable enable exit hunt mode/idle rcvd IRQs */
+                        usc_OutReg(info, RICR, usc_InReg(info,RICR) &
+                                ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
+                }
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        }
+exit:
+        if ( rc == 0 )
+                PUT_USER(rc, events, mask_ptr);
+                
+        return rc;
+        
+}       /* end of mgsl_wait_event() */
+
+static int modem_input_wait(struct mgsl_struct *info,int arg)
+{
+        unsigned long flags;
+        int rc;
+        struct mgsl_icount cprev, cnow;
+        DECLARE_WAITQUEUE(wait, current);
+
+        /* save current irq counts */
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        cprev = info->icount;
+        add_wait_queue(&info->status_event_wait_q, &wait);
+        set_current_state(TASK_INTERRUPTIBLE);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        for(;;) {
+                schedule();
+                if (signal_pending(current)) {
+                        rc = -ERESTARTSYS;
+                        break;
+                }
+
+                /* get new irq counts */
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                cnow = info->icount;
+                set_current_state(TASK_INTERRUPTIBLE);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+                /* if no change, wait aborted for some reason */
+                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
+                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
+                        rc = -EIO;
+                        break;
+                }
+
+                /* check for change in caller specified modem input */
+                if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
+                    (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
+                    (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
+                    (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
+                        rc = 0;
+                        break;
+                }
+
+                cprev = cnow;
+        }
+        remove_wait_queue(&info->status_event_wait_q, &wait);
+        set_current_state(TASK_RUNNING);
+        return rc;
+}
+
+/* return the state of the serial control and status signals
+ */
+static int tiocmget(struct tty_struct *tty)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned int result;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_get_serial_signals(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
+                ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
+                ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
+                ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
+                ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
+                ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s tiocmget() value=%08X\n",
+                         __FILE__,__LINE__, info->device_name, result );
+        return result;
+}
+
+/* set modem control signals (DTR/RTS)
+ */
+static int tiocmset(struct tty_struct *tty,
+                                    unsigned int set, unsigned int clear)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s tiocmset(%x,%x)\n",
+                        __FILE__,__LINE__,info->device_name, set, clear);
+
+        if (set & TIOCM_RTS)
+                info->serial_signals |= SerialSignal_RTS;
+        if (set & TIOCM_DTR)
+                info->serial_signals |= SerialSignal_DTR;
+        if (clear & TIOCM_RTS)
+                info->serial_signals &= ~SerialSignal_RTS;
+        if (clear & TIOCM_DTR)
+                info->serial_signals &= ~SerialSignal_DTR;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_set_serial_signals(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        return 0;
+}
+
+/* mgsl_break()         Set or clear transmit break condition
+ *
+ * Arguments:           tty             pointer to tty instance data
+ *                      break_state     -1=set break condition, 0=clear
+ * Return Value:        error code
+ */
+static int mgsl_break(struct tty_struct *tty, int break_state)
+{
+        struct mgsl_struct * info = tty->driver_data;
+        unsigned long flags;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_break(%s,%d)\n",
+                         __FILE__,__LINE__, info->device_name, break_state);
+                         
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
+                return -EINVAL;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if (break_state == -1)
+                usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
+        else 
+                usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        return 0;
+        
+}       /* end of mgsl_break() */
+
+/*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ *     RI where only 0->1 is counted.
+ */
+static int msgl_get_icount(struct tty_struct *tty,
+                                struct serial_icounter_struct *icount)
+
+{
+        struct mgsl_struct * info = tty->driver_data;
+        struct mgsl_icount cnow;        /* kernel counter temps */
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        cnow = info->icount;
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        icount->cts = cnow.cts;
+        icount->dsr = cnow.dsr;
+        icount->rng = cnow.rng;
+        icount->dcd = cnow.dcd;
+        icount->rx = cnow.rx;
+        icount->tx = cnow.tx;
+        icount->frame = cnow.frame;
+        icount->overrun = cnow.overrun;
+        icount->parity = cnow.parity;
+        icount->brk = cnow.brk;
+        icount->buf_overrun = cnow.buf_overrun;
+        return 0;
+}
+
+/* mgsl_ioctl() Service an IOCTL request
+ *      
+ * Arguments:
+ * 
+ *      tty     pointer to tty instance data
+ *      cmd     IOCTL command code
+ *      arg     command argument/context
+ *      
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_ioctl(struct tty_struct *tty,
+                    unsigned int cmd, unsigned long arg)
+{
+        struct mgsl_struct * info = tty->driver_data;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
+                        info->device_name, cmd );
+        
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
+                return -ENODEV;
+
+        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+            (cmd != TIOCMIWAIT)) {
+                if (tty->flags & (1 << TTY_IO_ERROR))
+                    return -EIO;
+        }
+
+        return mgsl_ioctl_common(info, cmd, arg);
+}
+
+static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
+{
+        void __user *argp = (void __user *)arg;
+        
+        switch (cmd) {
+                case MGSL_IOCGPARAMS:
+                        return mgsl_get_params(info, argp);
+                case MGSL_IOCSPARAMS:
+                        return mgsl_set_params(info, argp);
+                case MGSL_IOCGTXIDLE:
+                        return mgsl_get_txidle(info, argp);
+                case MGSL_IOCSTXIDLE:
+                        return mgsl_set_txidle(info,(int)arg);
+                case MGSL_IOCTXENABLE:
+                        return mgsl_txenable(info,(int)arg);
+                case MGSL_IOCRXENABLE:
+                        return mgsl_rxenable(info,(int)arg);
+                case MGSL_IOCTXABORT:
+                        return mgsl_txabort(info);
+                case MGSL_IOCGSTATS:
+                        return mgsl_get_stats(info, argp);
+                case MGSL_IOCWAITEVENT:
+                        return mgsl_wait_event(info, argp);
+                case MGSL_IOCLOOPTXDONE:
+                        return mgsl_loopmode_send_done(info);
+                /* Wait for modem input (DCD,RI,DSR,CTS) change
+                 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
+                 */
+                case TIOCMIWAIT:
+                        return modem_input_wait(info,(int)arg);
+
+                default:
+                        return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+/* mgsl_set_termios()
+ * 
+ *      Set new termios settings
+ *      
+ * Arguments:
+ * 
+ *      tty             pointer to tty structure
+ *      termios         pointer to buffer to hold returned old termios
+ *      
+ * Return Value:                None
+ */
+static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        struct mgsl_struct *info = tty->driver_data;
+        unsigned long flags;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
+                        tty->driver->name );
+        
+        mgsl_change_params(info);
+
+        /* Handle transition to B0 status */
+        if (old_termios->c_cflag & CBAUD &&
+            !(tty->termios->c_cflag & CBAUD)) {
+                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                usc_set_serial_signals(info);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        }
+        
+        /* Handle transition away from B0 status */
+        if (!(old_termios->c_cflag & CBAUD) &&
+            tty->termios->c_cflag & CBAUD) {
+                info->serial_signals |= SerialSignal_DTR;
+                if (!(tty->termios->c_cflag & CRTSCTS) || 
+                    !test_bit(TTY_THROTTLED, &tty->flags)) {
+                        info->serial_signals |= SerialSignal_RTS;
+                }
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                usc_set_serial_signals(info);
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        }
+        
+        /* Handle turning off CRTSCTS */
+        if (old_termios->c_cflag & CRTSCTS &&
+            !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                mgsl_start(tty);
+        }
+
+}       /* end of mgsl_set_termios() */
+
+/* mgsl_close()
+ * 
+ *      Called when port is closed. Wait for remaining data to be
+ *      sent. Disable port and free resources.
+ *      
+ * Arguments:
+ * 
+ *      tty     pointer to open tty structure
+ *      filp    pointer to open file object
+ *      
+ * Return Value:        None
+ */
+static void mgsl_close(struct tty_struct *tty, struct file * filp)
+{
+        struct mgsl_struct * info = tty->driver_data;
+
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
+                return;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
+                         __FILE__,__LINE__, info->device_name, info->port.count);
+
+        if (tty_port_close_start(&info->port, tty, filp) == 0)                   
+                goto cleanup;
+
+        mutex_lock(&info->port.mutex);
+        if (info->port.flags & ASYNC_INITIALIZED)
+                mgsl_wait_until_sent(tty, info->timeout);
+        mgsl_flush_buffer(tty);
+        tty_ldisc_flush(tty);
+        shutdown(info);
+        mutex_unlock(&info->port.mutex);
+
+        tty_port_close_end(&info->port, tty);   
+        info->port.tty = NULL;
+cleanup:                        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
+                        tty->driver->name, info->port.count);
+                        
+}       /* end of mgsl_close() */
+
+/* mgsl_wait_until_sent()
+ *
+ *      Wait until the transmitter is empty.
+ *
+ * Arguments:
+ *
+ *      tty             pointer to tty info structure
+ *      timeout         time to wait for send completion
+ *
+ * Return Value:        None
+ */
+static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        struct mgsl_struct * info = tty->driver_data;
+        unsigned long orig_jiffies, char_time;
+
+        if (!info )
+                return;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
+                         __FILE__,__LINE__, info->device_name );
+      
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
+                return;
+
+        if (!(info->port.flags & ASYNC_INITIALIZED))
+                goto exit;
+         
+        orig_jiffies = jiffies;
+      
+        /* Set check interval to 1/5 of estimated time to
+         * send a character, and make it at least 1. The check
+         * interval should also be less than the timeout.
+         * Note: use tight timings here to satisfy the NIST-PCTS.
+         */ 
+
+        if ( info->params.data_rate ) {
+                char_time = info->timeout/(32 * 5);
+                if (!char_time)
+                        char_time++;
+        } else
+                char_time = 1;
+                
+        if (timeout)
+                char_time = min_t(unsigned long, char_time, timeout);
+                
+        if ( info->params.mode == MGSL_MODE_HDLC ||
+                info->params.mode == MGSL_MODE_RAW ) {
+                while (info->tx_active) {
+                        msleep_interruptible(jiffies_to_msecs(char_time));
+                        if (signal_pending(current))
+                                break;
+                        if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                                break;
+                }
+        } else {
+                while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
+                        info->tx_enabled) {
+                        msleep_interruptible(jiffies_to_msecs(char_time));
+                        if (signal_pending(current))
+                                break;
+                        if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                                break;
+                }
+        }
+      
+exit:
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
+                         __FILE__,__LINE__, info->device_name );
+                         
+}       /* end of mgsl_wait_until_sent() */
+
+/* mgsl_hangup()
+ *
+ *      Called by tty_hangup() when a hangup is signaled.
+ *      This is the same as to closing all open files for the port.
+ *
+ * Arguments:           tty     pointer to associated tty object
+ * Return Value:        None
+ */
+static void mgsl_hangup(struct tty_struct *tty)
+{
+        struct mgsl_struct * info = tty->driver_data;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_hangup(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+                         
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
+                return;
+
+        mgsl_flush_buffer(tty);
+        shutdown(info);
+        
+        info->port.count = 0;   
+        info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
+        info->port.tty = NULL;
+
+        wake_up_interruptible(&info->port.open_wait);
+        
+}       /* end of mgsl_hangup() */
+
+/*
+ * carrier_raised()
+ *
+ *      Return true if carrier is raised
+ */
+
+static int carrier_raised(struct tty_port *port)
+{
+        unsigned long flags;
+        struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
+        
+        spin_lock_irqsave(&info->irq_spinlock, flags);
+        usc_get_serial_signals(info);
+        spin_unlock_irqrestore(&info->irq_spinlock, flags);
+        return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
+}
+
+static void dtr_rts(struct tty_port *port, int on)
+{
+        struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if (on)
+                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        else
+                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+        usc_set_serial_signals(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+}
+
+
+/* block_til_ready()
+ * 
+ *      Block the current process until the specified port
+ *      is ready to be opened.
+ *      
+ * Arguments:
+ * 
+ *      tty             pointer to tty info structure
+ *      filp            pointer to open file object
+ *      info            pointer to device instance data
+ *      
+ * Return Value:        0 if success, otherwise error code
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+                           struct mgsl_struct *info)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        int             retval;
+        bool            do_clocal = false;
+        bool            extra_count = false;
+        unsigned long   flags;
+        int             dcd;
+        struct tty_port *port = &info->port;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):block_til_ready on %s\n",
+                         __FILE__,__LINE__, tty->driver->name );
+
+        if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
+                /* nonblock mode is set or port is not enabled */
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (tty->termios->c_cflag & CLOCAL)
+                do_clocal = true;
+
+        /* Wait for carrier detect and the line to become
+         * free (i.e., not in use by the callout).  While we are in
+         * this loop, port->count is dropped by one, so that
+         * mgsl_close() knows when to free things.  We restore it upon
+         * exit, either normal or abnormal.
+         */
+         
+        retval = 0;
+        add_wait_queue(&port->open_wait, &wait);
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):block_til_ready before block on %s count=%d\n",
+                         __FILE__,__LINE__, tty->driver->name, port->count );
+
+        spin_lock_irqsave(&info->irq_spinlock, flags);
+        if (!tty_hung_up_p(filp)) {
+                extra_count = true;
+                port->count--;
+        }
+        spin_unlock_irqrestore(&info->irq_spinlock, flags);
+        port->blocked_open++;
+        
+        while (1) {
+                if (tty->termios->c_cflag & CBAUD)
+                        tty_port_raise_dtr_rts(port);
+                
+                set_current_state(TASK_INTERRUPTIBLE);
+                
+                if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
+                        retval = (port->flags & ASYNC_HUP_NOTIFY) ?
+                                        -EAGAIN : -ERESTARTSYS;
+                        break;
+                }
+                
+                dcd = tty_port_carrier_raised(&info->port);
+                
+                if (!(port->flags & ASYNC_CLOSING) && (do_clocal || dcd))
+                        break;
+                        
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+                
+                if (debug_level >= DEBUG_LEVEL_INFO)
+                        printk("%s(%d):block_til_ready blocking on %s count=%d\n",
+                                 __FILE__,__LINE__, tty->driver->name, port->count );
+                                 
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+        
+        set_current_state(TASK_RUNNING);
+        remove_wait_queue(&port->open_wait, &wait);
+        
+        /* FIXME: Racy on hangup during close wait */
+        if (extra_count)
+                port->count++;
+        port->blocked_open--;
+        
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
+                         __FILE__,__LINE__, tty->driver->name, port->count );
+                         
+        if (!retval)
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+                
+        return retval;
+        
+}       /* end of block_til_ready() */
+
+/* mgsl_open()
+ *
+ *      Called when a port is opened.  Init and enable port.
+ *      Perform serial-specific initialization for the tty structure.
+ *
+ * Arguments:           tty     pointer to tty info structure
+ *                      filp    associated file pointer
+ *
+ * Return Value:        0 if success, otherwise error code
+ */
+static int mgsl_open(struct tty_struct *tty, struct file * filp)
+{
+        struct mgsl_struct      *info;
+        int                     retval, line;
+        unsigned long flags;
+
+        /* verify range of specified line number */     
+        line = tty->index;
+        if ((line < 0) || (line >= mgsl_device_count)) {
+                printk("%s(%d):mgsl_open with invalid line #%d.\n",
+                        __FILE__,__LINE__,line);
+                return -ENODEV;
+        }
+
+        /* find the info structure for the specified line */
+        info = mgsl_device_list;
+        while(info && info->line != line)
+                info = info->next_device;
+        if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
+                return -ENODEV;
+        
+        tty->driver_data = info;
+        info->port.tty = tty;
+                
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
+                         __FILE__,__LINE__,tty->driver->name, info->port.count);
+
+        /* If port is closing, signal caller to try again */
+        if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
+                if (info->port.flags & ASYNC_CLOSING)
+                        interruptible_sleep_on(&info->port.close_wait);
+                retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
+                        -EAGAIN : -ERESTARTSYS);
+                goto cleanup;
+        }
+        
+        info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+        spin_lock_irqsave(&info->netlock, flags);
+        if (info->netcount) {
+                retval = -EBUSY;
+                spin_unlock_irqrestore(&info->netlock, flags);
+                goto cleanup;
+        }
+        info->port.count++;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        if (info->port.count == 1) {
+                /* 1st open on this device, init hardware */
+                retval = startup(info);
+                if (retval < 0)
+                        goto cleanup;
+        }
+
+        retval = block_til_ready(tty, filp, info);
+        if (retval) {
+                if (debug_level >= DEBUG_LEVEL_INFO)
+                        printk("%s(%d):block_til_ready(%s) returned %d\n",
+                                 __FILE__,__LINE__, info->device_name, retval);
+                goto cleanup;
+        }
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):mgsl_open(%s) success\n",
+                         __FILE__,__LINE__, info->device_name);
+        retval = 0;
+        
+cleanup:                        
+        if (retval) {
+                if (tty->count == 1)
+                        info->port.tty = NULL; /* tty layer will release tty struct */
+                if(info->port.count)
+                        info->port.count--;
+        }
+        
+        return retval;
+        
+}       /* end of mgsl_open() */
+
+/*
+ * /proc fs routines....
+ */
+
+static inline void line_info(struct seq_file *m, struct mgsl_struct *info)
+{
+        char    stat_buf[30];
+        unsigned long flags;
+
+        if (info->bus_type == MGSL_BUS_TYPE_PCI) {
+                seq_printf(m, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
+                        info->device_name, info->io_base, info->irq_level,
+                        info->phys_memory_base, info->phys_lcr_base);
+        } else {
+                seq_printf(m, "%s:(E)ISA io:%04X irq:%d dma:%d",
+                        info->device_name, info->io_base, 
+                        info->irq_level, info->dma_level);
+        }
+
+        /* output current serial signal states */
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_get_serial_signals(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+        stat_buf[0] = 0;
+        stat_buf[1] = 0;
+        if (info->serial_signals & SerialSignal_RTS)
+                strcat(stat_buf, "|RTS");
+        if (info->serial_signals & SerialSignal_CTS)
+                strcat(stat_buf, "|CTS");
+        if (info->serial_signals & SerialSignal_DTR)
+                strcat(stat_buf, "|DTR");
+        if (info->serial_signals & SerialSignal_DSR)
+                strcat(stat_buf, "|DSR");
+        if (info->serial_signals & SerialSignal_DCD)
+                strcat(stat_buf, "|CD");
+        if (info->serial_signals & SerialSignal_RI)
+                strcat(stat_buf, "|RI");
+
+        if (info->params.mode == MGSL_MODE_HDLC ||
+            info->params.mode == MGSL_MODE_RAW ) {
+                seq_printf(m, " HDLC txok:%d rxok:%d",
+                              info->icount.txok, info->icount.rxok);
+                if (info->icount.txunder)
+                        seq_printf(m, " txunder:%d", info->icount.txunder);
+                if (info->icount.txabort)
+                        seq_printf(m, " txabort:%d", info->icount.txabort);
+                if (info->icount.rxshort)
+                        seq_printf(m, " rxshort:%d", info->icount.rxshort);
+                if (info->icount.rxlong)
+                        seq_printf(m, " rxlong:%d", info->icount.rxlong);
+                if (info->icount.rxover)
+                        seq_printf(m, " rxover:%d", info->icount.rxover);
+                if (info->icount.rxcrc)
+                        seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
+        } else {
+                seq_printf(m, " ASYNC tx:%d rx:%d",
+                              info->icount.tx, info->icount.rx);
+                if (info->icount.frame)
+                        seq_printf(m, " fe:%d", info->icount.frame);
+                if (info->icount.parity)
+                        seq_printf(m, " pe:%d", info->icount.parity);
+                if (info->icount.brk)
+                        seq_printf(m, " brk:%d", info->icount.brk);
+                if (info->icount.overrun)
+                        seq_printf(m, " oe:%d", info->icount.overrun);
+        }
+        
+        /* Append serial signal status to end */
+        seq_printf(m, " %s\n", stat_buf+1);
+        
+        seq_printf(m, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
+         info->tx_active,info->bh_requested,info->bh_running,
+         info->pending_bh);
+         
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        {       
+        u16 Tcsr = usc_InReg( info, TCSR );
+        u16 Tdmr = usc_InDmaReg( info, TDMR );
+        u16 Ticr = usc_InReg( info, TICR );
+        u16 Rscr = usc_InReg( info, RCSR );
+        u16 Rdmr = usc_InDmaReg( info, RDMR );
+        u16 Ricr = usc_InReg( info, RICR );
+        u16 Icr = usc_InReg( info, ICR );
+        u16 Dccr = usc_InReg( info, DCCR );
+        u16 Tmr = usc_InReg( info, TMR );
+        u16 Tccr = usc_InReg( info, TCCR );
+        u16 Ccar = inw( info->io_base + CCAR );
+        seq_printf(m, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
+                        "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
+                        Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
+        }
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+}
+
+/* Called to print information about devices */
+static int mgsl_proc_show(struct seq_file *m, void *v)
+{
+        struct mgsl_struct *info;
+        
+        seq_printf(m, "synclink driver:%s\n", driver_version);
+        
+        info = mgsl_device_list;
+        while( info ) {
+                line_info(m, info);
+                info = info->next_device;
+        }
+        return 0;
+}
+
+static int mgsl_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, mgsl_proc_show, NULL);
+}
+
+static const struct file_operations mgsl_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = mgsl_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/* mgsl_allocate_dma_buffers()
+ * 
+ *      Allocate and format DMA buffers (ISA adapter)
+ *      or format shared memory buffers (PCI adapter).
+ * 
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        0 if success, otherwise error
+ */
+static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
+{
+        unsigned short BuffersPerFrame;
+
+        info->last_mem_alloc = 0;
+
+        /* Calculate the number of DMA buffers necessary to hold the */
+        /* largest allowable frame size. Note: If the max frame size is */
+        /* not an even multiple of the DMA buffer size then we need to */
+        /* round the buffer count per frame up one. */
+
+        BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
+        if ( info->max_frame_size % DMABUFFERSIZE )
+                BuffersPerFrame++;
+
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                /*
+                 * The PCI adapter has 256KBytes of shared memory to use.
+                 * This is 64 PAGE_SIZE buffers.
+                 *
+                 * The first page is used for padding at this time so the
+                 * buffer list does not begin at offset 0 of the PCI
+                 * adapter's shared memory.
+                 *
+                 * The 2nd page is used for the buffer list. A 4K buffer
+                 * list can hold 128 DMA_BUFFER structures at 32 bytes
+                 * each.
+                 *
+                 * This leaves 62 4K pages.
+                 *
+                 * The next N pages are used for transmit frame(s). We
+                 * reserve enough 4K page blocks to hold the required
+                 * number of transmit dma buffers (num_tx_dma_buffers),
+                 * each of MaxFrameSize size.
+                 *
+                 * Of the remaining pages (62-N), determine how many can
+                 * be used to receive full MaxFrameSize inbound frames
+                 */
+                info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
+                info->rx_buffer_count = 62 - info->tx_buffer_count;
+        } else {
+                /* Calculate the number of PAGE_SIZE buffers needed for */
+                /* receive and transmit DMA buffers. */
+
+
+                /* Calculate the number of DMA buffers necessary to */
+                /* hold 7 max size receive frames and one max size transmit frame. */
+                /* The receive buffer count is bumped by one so we avoid an */
+                /* End of List condition if all receive buffers are used when */
+                /* using linked list DMA buffers. */
+
+                info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
+                info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
+                
+                /* 
+                 * limit total TxBuffers & RxBuffers to 62 4K total 
+                 * (ala PCI Allocation) 
+                 */
+                
+                if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
+                        info->rx_buffer_count = 62 - info->tx_buffer_count;
+
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
+                        __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
+        
+        if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
+                  mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 || 
+                  mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 || 
+                  mgsl_alloc_intermediate_rxbuffer_memory(info) < 0  ||
+                  mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
+                printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
+                return -ENOMEM;
+        }
+        
+        mgsl_reset_rx_dma_buffers( info );
+        mgsl_reset_tx_dma_buffers( info );
+
+        return 0;
+
+}       /* end of mgsl_allocate_dma_buffers() */
+
+/*
+ * mgsl_alloc_buffer_list_memory()
+ * 
+ * Allocate a common DMA buffer for use as the
+ * receive and transmit buffer lists.
+ * 
+ * A buffer list is a set of buffer entries where each entry contains
+ * a pointer to an actual buffer and a pointer to the next buffer entry
+ * (plus some other info about the buffer).
+ * 
+ * The buffer entries for a list are built to form a circular list so
+ * that when the entire list has been traversed you start back at the
+ * beginning.
+ * 
+ * This function allocates memory for just the buffer entries.
+ * The links (pointer to next entry) are filled in with the physical
+ * address of the next entry so the adapter can navigate the list
+ * using bus master DMA. The pointers to the actual buffers are filled
+ * out later when the actual buffers are allocated.
+ * 
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        0 if success, otherwise error
+ */
+static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
+{
+        unsigned int i;
+
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                /* PCI adapter uses shared memory. */
+                info->buffer_list = info->memory_base + info->last_mem_alloc;
+                info->buffer_list_phys = info->last_mem_alloc;
+                info->last_mem_alloc += BUFFERLISTSIZE;
+        } else {
+                /* ISA adapter uses system memory. */
+                /* The buffer lists are allocated as a common buffer that both */
+                /* the processor and adapter can access. This allows the driver to */
+                /* inspect portions of the buffer while other portions are being */
+                /* updated by the adapter using Bus Master DMA. */
+
+                info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
+                if (info->buffer_list == NULL)
+                        return -ENOMEM;
+                info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
+        }
+
+        /* We got the memory for the buffer entry lists. */
+        /* Initialize the memory block to all zeros. */
+        memset( info->buffer_list, 0, BUFFERLISTSIZE );
+
+        /* Save virtual address pointers to the receive and */
+        /* transmit buffer lists. (Receive 1st). These pointers will */
+        /* be used by the processor to access the lists. */
+        info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
+        info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
+        info->tx_buffer_list += info->rx_buffer_count;
+
+        /*
+         * Build the links for the buffer entry lists such that
+         * two circular lists are built. (Transmit and Receive).
+         *
+         * Note: the links are physical addresses
+         * which are read by the adapter to determine the next
+         * buffer entry to use.
+         */
+
+        for ( i = 0; i < info->rx_buffer_count; i++ ) {
+                /* calculate and store physical address of this buffer entry */
+                info->rx_buffer_list[i].phys_entry =
+                        info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
+
+                /* calculate and store physical address of */
+                /* next entry in cirular list of entries */
+
+                info->rx_buffer_list[i].link = info->buffer_list_phys;
+
+                if ( i < info->rx_buffer_count - 1 )
+                        info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
+        }
+
+        for ( i = 0; i < info->tx_buffer_count; i++ ) {
+                /* calculate and store physical address of this buffer entry */
+                info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
+                        ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
+
+                /* calculate and store physical address of */
+                /* next entry in cirular list of entries */
+
+                info->tx_buffer_list[i].link = info->buffer_list_phys +
+                        info->rx_buffer_count * sizeof(DMABUFFERENTRY);
+
+                if ( i < info->tx_buffer_count - 1 )
+                        info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
+        }
+
+        return 0;
+
+}       /* end of mgsl_alloc_buffer_list_memory() */
+
+/* Free DMA buffers allocated for use as the
+ * receive and transmit buffer lists.
+ * Warning:
+ * 
+ *      The data transfer buffers associated with the buffer list
+ *      MUST be freed before freeing the buffer list itself because
+ *      the buffer list contains the information necessary to free
+ *      the individual buffers!
+ */
+static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
+{
+        if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
+                dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
+                
+        info->buffer_list = NULL;
+        info->rx_buffer_list = NULL;
+        info->tx_buffer_list = NULL;
+
+}       /* end of mgsl_free_buffer_list_memory() */
+
+/*
+ * mgsl_alloc_frame_memory()
+ * 
+ *      Allocate the frame DMA buffers used by the specified buffer list.
+ *      Each DMA buffer will be one memory page in size. This is necessary
+ *      because memory can fragment enough that it may be impossible
+ *      contiguous pages.
+ * 
+ * Arguments:
+ * 
+ *      info            pointer to device instance data
+ *      BufferList      pointer to list of buffer entries
+ *      Buffercount     count of buffer entries in buffer list
+ * 
+ * Return Value:        0 if success, otherwise -ENOMEM
+ */
+static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
+{
+        int i;
+        u32 phys_addr;
+
+        /* Allocate page sized buffers for the receive buffer list */
+
+        for ( i = 0; i < Buffercount; i++ ) {
+                if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                        /* PCI adapter uses shared memory buffers. */
+                        BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
+                        phys_addr = info->last_mem_alloc;
+                        info->last_mem_alloc += DMABUFFERSIZE;
+                } else {
+                        /* ISA adapter uses system memory. */
+                        BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
+                        if (BufferList[i].virt_addr == NULL)
+                                return -ENOMEM;
+                        phys_addr = (u32)(BufferList[i].dma_addr);
+                }
+                BufferList[i].phys_addr = phys_addr;
+        }
+
+        return 0;
+
+}       /* end of mgsl_alloc_frame_memory() */
+
+/*
+ * mgsl_free_frame_memory()
+ * 
+ *      Free the buffers associated with
+ *      each buffer entry of a buffer list.
+ * 
+ * Arguments:
+ * 
+ *      info            pointer to device instance data
+ *      BufferList      pointer to list of buffer entries
+ *      Buffercount     count of buffer entries in buffer list
+ * 
+ * Return Value:        None
+ */
+static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
+{
+        int i;
+
+        if ( BufferList ) {
+                for ( i = 0 ; i < Buffercount ; i++ ) {
+                        if ( BufferList[i].virt_addr ) {
+                                if ( info->bus_type != MGSL_BUS_TYPE_PCI )
+                                        dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
+                                BufferList[i].virt_addr = NULL;
+                        }
+                }
+        }
+
+}       /* end of mgsl_free_frame_memory() */
+
+/* mgsl_free_dma_buffers()
+ * 
+ *      Free DMA buffers
+ *      
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_free_dma_buffers( struct mgsl_struct *info )
+{
+        mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
+        mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
+        mgsl_free_buffer_list_memory( info );
+
+}       /* end of mgsl_free_dma_buffers() */
+
+
+/*
+ * mgsl_alloc_intermediate_rxbuffer_memory()
+ * 
+ *      Allocate a buffer large enough to hold max_frame_size. This buffer
+ *      is used to pass an assembled frame to the line discipline.
+ * 
+ * Arguments:
+ * 
+ *      info            pointer to device instance data
+ * 
+ * Return Value:        0 if success, otherwise -ENOMEM
+ */
+static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
+{
+        info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
+        if ( info->intermediate_rxbuffer == NULL )
+                return -ENOMEM;
+
+        return 0;
+
+}       /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
+
+/*
+ * mgsl_free_intermediate_rxbuffer_memory()
+ * 
+ * 
+ * Arguments:
+ * 
+ *      info            pointer to device instance data
+ * 
+ * Return Value:        None
+ */
+static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
+{
+        kfree(info->intermediate_rxbuffer);
+        info->intermediate_rxbuffer = NULL;
+
+}       /* end of mgsl_free_intermediate_rxbuffer_memory() */
+
+/*
+ * mgsl_alloc_intermediate_txbuffer_memory()
+ *
+ *      Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
+ *      This buffer is used to load transmit frames into the adapter's dma transfer
+ *      buffers when there is sufficient space.
+ *
+ * Arguments:
+ *
+ *      info            pointer to device instance data
+ *
+ * Return Value:        0 if success, otherwise -ENOMEM
+ */
+static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
+{
+        int i;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("%s %s(%d)  allocating %d tx holding buffers\n",
+                                info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
+
+        memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
+
+        for ( i=0; i<info->num_tx_holding_buffers; ++i) {
+                info->tx_holding_buffers[i].buffer =
+                        kmalloc(info->max_frame_size, GFP_KERNEL);
+                if (info->tx_holding_buffers[i].buffer == NULL) {
+                        for (--i; i >= 0; i--) {
+                                kfree(info->tx_holding_buffers[i].buffer);
+                                info->tx_holding_buffers[i].buffer = NULL;
+                        }
+                        return -ENOMEM;
+                }
+        }
+
+        return 0;
+
+}       /* end of mgsl_alloc_intermediate_txbuffer_memory() */
+
+/*
+ * mgsl_free_intermediate_txbuffer_memory()
+ *
+ *
+ * Arguments:
+ *
+ *      info            pointer to device instance data
+ *
+ * Return Value:        None
+ */
+static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
+{
+        int i;
+
+        for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
+                kfree(info->tx_holding_buffers[i].buffer);
+                info->tx_holding_buffers[i].buffer = NULL;
+        }
+
+        info->get_tx_holding_index = 0;
+        info->put_tx_holding_index = 0;
+        info->tx_holding_count = 0;
+
+}       /* end of mgsl_free_intermediate_txbuffer_memory() */
+
+
+/*
+ * load_next_tx_holding_buffer()
+ *
+ * attempts to load the next buffered tx request into the
+ * tx dma buffers
+ *
+ * Arguments:
+ *
+ *      info            pointer to device instance data
+ *
+ * Return Value:        true if next buffered tx request loaded
+ *                      into adapter's tx dma buffer,
+ *                      false otherwise
+ */
+static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
+{
+        bool ret = false;
+
+        if ( info->tx_holding_count ) {
+                /* determine if we have enough tx dma buffers
+                 * to accommodate the next tx frame
+                 */
+                struct tx_holding_buffer *ptx =
+                        &info->tx_holding_buffers[info->get_tx_holding_index];
+                int num_free = num_free_tx_dma_buffers(info);
+                int num_needed = ptx->buffer_size / DMABUFFERSIZE;
+                if ( ptx->buffer_size % DMABUFFERSIZE )
+                        ++num_needed;
+
+                if (num_needed <= num_free) {
+                        info->xmit_cnt = ptx->buffer_size;
+                        mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
+
+                        --info->tx_holding_count;
+                        if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
+                                info->get_tx_holding_index=0;
+
+                        /* restart transmit timer */
+                        mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
+
+                        ret = true;
+                }
+        }
+
+        return ret;
+}
+
+/*
+ * save_tx_buffer_request()
+ *
+ * attempt to store transmit frame request for later transmission
+ *
+ * Arguments:
+ *
+ *      info            pointer to device instance data
+ *      Buffer          pointer to buffer containing frame to load
+ *      BufferSize      size in bytes of frame in Buffer
+ *
+ * Return Value:        1 if able to store, 0 otherwise
+ */
+static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
+{
+        struct tx_holding_buffer *ptx;
+
+        if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
+                return 0;               /* all buffers in use */
+        }
+
+        ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
+        ptx->buffer_size = BufferSize;
+        memcpy( ptx->buffer, Buffer, BufferSize);
+
+        ++info->tx_holding_count;
+        if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
+                info->put_tx_holding_index=0;
+
+        return 1;
+}
+
+static int mgsl_claim_resources(struct mgsl_struct *info)
+{
+        if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
+                printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->io_base);
+                return -ENODEV;
+        }
+        info->io_addr_requested = true;
+        
+        if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
+                info->device_name, info ) < 0 ) {
+                printk( "%s(%d):Can't request interrupt on device %s IRQ=%d\n",
+                        __FILE__,__LINE__,info->device_name, info->irq_level );
+                goto errout;
+        }
+        info->irq_requested = true;
+        
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
+                        printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
+                                __FILE__,__LINE__,info->device_name, info->phys_memory_base);
+                        goto errout;
+                }
+                info->shared_mem_requested = true;
+                if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
+                        printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
+                                __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
+                        goto errout;
+                }
+                info->lcr_mem_requested = true;
+
+                info->memory_base = ioremap_nocache(info->phys_memory_base,
+                                                                0x40000);
+                if (!info->memory_base) {
+                        printk( "%s(%d):Can't map shared memory on device %s MemAddr=%08X\n",
+                                __FILE__,__LINE__,info->device_name, info->phys_memory_base );
+                        goto errout;
+                }
+                
+                if ( !mgsl_memory_test(info) ) {
+                        printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
+                                __FILE__,__LINE__,info->device_name, info->phys_memory_base );
+                        goto errout;
+                }
+                
+                info->lcr_base = ioremap_nocache(info->phys_lcr_base,
+                                                                PAGE_SIZE);
+                if (!info->lcr_base) {
+                        printk( "%s(%d):Can't map LCR memory on device %s MemAddr=%08X\n",
+                                __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
+                        goto errout;
+                }
+                info->lcr_base += info->lcr_offset;
+                
+        } else {
+                /* claim DMA channel */
+                
+                if (request_dma(info->dma_level,info->device_name) < 0){
+                        printk( "%s(%d):Can't request DMA channel on device %s DMA=%d\n",
+                                __FILE__,__LINE__,info->device_name, info->dma_level );
+                        mgsl_release_resources( info );
+                        return -ENODEV;
+                }
+                info->dma_requested = true;
+
+                /* ISA adapter uses bus master DMA */           
+                set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
+                enable_dma(info->dma_level);
+        }
+        
+        if ( mgsl_allocate_dma_buffers(info) < 0 ) {
+                printk( "%s(%d):Can't allocate DMA buffers on device %s DMA=%d\n",
+                        __FILE__,__LINE__,info->device_name, info->dma_level );
+                goto errout;
+        }       
+        
+        return 0;
+errout:
+        mgsl_release_resources(info);
+        return -ENODEV;
+
+}       /* end of mgsl_claim_resources() */
+
+static void mgsl_release_resources(struct mgsl_struct *info)
+{
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):mgsl_release_resources(%s) entry\n",
+                        __FILE__,__LINE__,info->device_name );
+                        
+        if ( info->irq_requested ) {
+                free_irq(info->irq_level, info);
+                info->irq_requested = false;
+        }
+        if ( info->dma_requested ) {
+                disable_dma(info->dma_level);
+                free_dma(info->dma_level);
+                info->dma_requested = false;
+        }
+        mgsl_free_dma_buffers(info);
+        mgsl_free_intermediate_rxbuffer_memory(info);
+        mgsl_free_intermediate_txbuffer_memory(info);
+        
+        if ( info->io_addr_requested ) {
+                release_region(info->io_base,info->io_addr_size);
+                info->io_addr_requested = false;
+        }
+        if ( info->shared_mem_requested ) {
+                release_mem_region(info->phys_memory_base,0x40000);
+                info->shared_mem_requested = false;
+        }
+        if ( info->lcr_mem_requested ) {
+                release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
+                info->lcr_mem_requested = false;
+        }
+        if (info->memory_base){
+                iounmap(info->memory_base);
+                info->memory_base = NULL;
+        }
+        if (info->lcr_base){
+                iounmap(info->lcr_base - info->lcr_offset);
+                info->lcr_base = NULL;
+        }
+        
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):mgsl_release_resources(%s) exit\n",
+                        __FILE__,__LINE__,info->device_name );
+                        
+}       /* end of mgsl_release_resources() */
+
+/* mgsl_add_device()
+ * 
+ *      Add the specified device instance data structure to the
+ *      global linked list of devices and increment the device count.
+ *      
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_add_device( struct mgsl_struct *info )
+{
+        info->next_device = NULL;
+        info->line = mgsl_device_count;
+        sprintf(info->device_name,"ttySL%d",info->line);
+        
+        if (info->line < MAX_TOTAL_DEVICES) {
+                if (maxframe[info->line])
+                        info->max_frame_size = maxframe[info->line];
+
+                if (txdmabufs[info->line]) {
+                        info->num_tx_dma_buffers = txdmabufs[info->line];
+                        if (info->num_tx_dma_buffers < 1)
+                                info->num_tx_dma_buffers = 1;
+                }
+
+                if (txholdbufs[info->line]) {
+                        info->num_tx_holding_buffers = txholdbufs[info->line];
+                        if (info->num_tx_holding_buffers < 1)
+                                info->num_tx_holding_buffers = 1;
+                        else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
+                                info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
+                }
+        }
+
+        mgsl_device_count++;
+        
+        if ( !mgsl_device_list )
+                mgsl_device_list = info;
+        else {  
+                struct mgsl_struct *current_dev = mgsl_device_list;
+                while( current_dev->next_device )
+                        current_dev = current_dev->next_device;
+                current_dev->next_device = info;
+        }
+        
+        if ( info->max_frame_size < 4096 )
+                info->max_frame_size = 4096;
+        else if ( info->max_frame_size > 65535 )
+                info->max_frame_size = 65535;
+        
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
+                        info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
+                        info->phys_memory_base, info->phys_lcr_base,
+                        info->max_frame_size );
+        } else {
+                printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
+                        info->device_name, info->io_base, info->irq_level, info->dma_level,
+                        info->max_frame_size );
+        }
+
+#if SYNCLINK_GENERIC_HDLC
+        hdlcdev_init(info);
+#endif
+
+}       /* end of mgsl_add_device() */
+
+static const struct tty_port_operations mgsl_port_ops = {
+        .carrier_raised = carrier_raised,
+        .dtr_rts = dtr_rts,
+};
+
+
+/* mgsl_allocate_device()
+ * 
+ *      Allocate and initialize a device instance structure
+ *      
+ * Arguments:           none
+ * Return Value:        pointer to mgsl_struct if success, otherwise NULL
+ */
+static struct mgsl_struct* mgsl_allocate_device(void)
+{
+        struct mgsl_struct *info;
+        
+        info = kzalloc(sizeof(struct mgsl_struct),
+                 GFP_KERNEL);
+                 
+        if (!info) {
+                printk("Error can't allocate device instance data\n");
+        } else {
+                tty_port_init(&info->port);
+                info->port.ops = &mgsl_port_ops;
+                info->magic = MGSL_MAGIC;
+                INIT_WORK(&info->task, mgsl_bh_handler);
+                info->max_frame_size = 4096;
+                info->port.close_delay = 5*HZ/10;
+                info->port.closing_wait = 30*HZ;
+                init_waitqueue_head(&info->status_event_wait_q);
+                init_waitqueue_head(&info->event_wait_q);
+                spin_lock_init(&info->irq_spinlock);
+                spin_lock_init(&info->netlock);
+                memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
+                info->idle_mode = HDLC_TXIDLE_FLAGS;            
+                info->num_tx_dma_buffers = 1;
+                info->num_tx_holding_buffers = 0;
+        }
+        
+        return info;
+
+}       /* end of mgsl_allocate_device()*/
+
+static const struct tty_operations mgsl_ops = {
+        .open = mgsl_open,
+        .close = mgsl_close,
+        .write = mgsl_write,
+        .put_char = mgsl_put_char,
+        .flush_chars = mgsl_flush_chars,
+        .write_room = mgsl_write_room,
+        .chars_in_buffer = mgsl_chars_in_buffer,
+        .flush_buffer = mgsl_flush_buffer,
+        .ioctl = mgsl_ioctl,
+        .throttle = mgsl_throttle,
+        .unthrottle = mgsl_unthrottle,
+        .send_xchar = mgsl_send_xchar,
+        .break_ctl = mgsl_break,
+        .wait_until_sent = mgsl_wait_until_sent,
+        .set_termios = mgsl_set_termios,
+        .stop = mgsl_stop,
+        .start = mgsl_start,
+        .hangup = mgsl_hangup,
+        .tiocmget = tiocmget,
+        .tiocmset = tiocmset,
+        .get_icount = msgl_get_icount,
+        .proc_fops = &mgsl_proc_fops,
+};
+
+/*
+ * perform tty device initialization
+ */
+static int mgsl_init_tty(void)
+{
+        int rc;
+
+        serial_driver = alloc_tty_driver(128);
+        if (!serial_driver)
+                return -ENOMEM;
+        
+        serial_driver->owner = THIS_MODULE;
+        serial_driver->driver_name = "synclink";
+        serial_driver->name = "ttySL";
+        serial_driver->major = ttymajor;
+        serial_driver->minor_start = 64;
+        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        serial_driver->subtype = SERIAL_TYPE_NORMAL;
+        serial_driver->init_termios = tty_std_termios;
+        serial_driver->init_termios.c_cflag =
+                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        serial_driver->init_termios.c_ispeed = 9600;
+        serial_driver->init_termios.c_ospeed = 9600;
+        serial_driver->flags = TTY_DRIVER_REAL_RAW;
+        tty_set_operations(serial_driver, &mgsl_ops);
+        if ((rc = tty_register_driver(serial_driver)) < 0) {
+                printk("%s(%d):Couldn't register serial driver\n",
+                        __FILE__,__LINE__);
+                put_tty_driver(serial_driver);
+                serial_driver = NULL;
+                return rc;
+        }
+                        
+        printk("%s %s, tty major#%d\n",
+                driver_name, driver_version,
+                serial_driver->major);
+        return 0;
+}
+
+/* enumerate user specified ISA adapters
+ */
+static void mgsl_enum_isa_devices(void)
+{
+        struct mgsl_struct *info;
+        int i;
+                
+        /* Check for user specified ISA devices */
+        
+        for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
+                if ( debug_level >= DEBUG_LEVEL_INFO )
+                        printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
+                                io[i], irq[i], dma[i] );
+                
+                info = mgsl_allocate_device();
+                if ( !info ) {
+                        /* error allocating device instance data */
+                        if ( debug_level >= DEBUG_LEVEL_ERROR )
+                                printk( "can't allocate device instance data.\n");
+                        continue;
+                }
+                
+                /* Copy user configuration info to device instance data */
+                info->io_base = (unsigned int)io[i];
+                info->irq_level = (unsigned int)irq[i];
+                info->irq_level = irq_canonicalize(info->irq_level);
+                info->dma_level = (unsigned int)dma[i];
+                info->bus_type = MGSL_BUS_TYPE_ISA;
+                info->io_addr_size = 16;
+                info->irq_flags = 0;
+                
+                mgsl_add_device( info );
+        }
+}
+
+static void synclink_cleanup(void)
+{
+        int rc;
+        struct mgsl_struct *info;
+        struct mgsl_struct *tmp;
+
+        printk("Unloading %s: %s\n", driver_name, driver_version);
+
+        if (serial_driver) {
+                if ((rc = tty_unregister_driver(serial_driver)))
+                        printk("%s(%d) failed to unregister tty driver err=%d\n",
+                               __FILE__,__LINE__,rc);
+                put_tty_driver(serial_driver);
+        }
+
+        info = mgsl_device_list;
+        while(info) {
+#if SYNCLINK_GENERIC_HDLC
+                hdlcdev_exit(info);
+#endif
+                mgsl_release_resources(info);
+                tmp = info;
+                info = info->next_device;
+                kfree(tmp);
+        }
+        
+        if (pci_registered)
+                pci_unregister_driver(&synclink_pci_driver);
+}
+
+static int __init synclink_init(void)
+{
+        int rc;
+
+        if (break_on_load) {
+                mgsl_get_text_ptr();
+                BREAKPOINT();
+        }
+
+        printk("%s %s\n", driver_name, driver_version);
+
+        mgsl_enum_isa_devices();
+        if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
+                printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
+        else
+                pci_registered = true;
+
+        if ((rc = mgsl_init_tty()) < 0)
+                goto error;
+
+        return 0;
+
+error:
+        synclink_cleanup();
+        return rc;
+}
+
+static void __exit synclink_exit(void)
+{
+        synclink_cleanup();
+}
+
+module_init(synclink_init);
+module_exit(synclink_exit);
+
+/*
+ * usc_RTCmd()
+ *
+ * Issue a USC Receive/Transmit command to the
+ * Channel Command/Address Register (CCAR).
+ *
+ * Notes:
+ *
+ *    The command is encoded in the most significant 5 bits <15..11>
+ *    of the CCAR value. Bits <10..7> of the CCAR must be preserved
+ *    and Bits <6..0> must be written as zeros.
+ *
+ * Arguments:
+ *
+ *    info   pointer to device information structure
+ *    Cmd    command mask (use symbolic macros)
+ *
+ * Return Value:
+ *
+ *    None
+ */
+static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
+{
+        /* output command to CCAR in bits <15..11> */
+        /* preserve bits <10..7>, bits <6..0> must be zero */
+
+        outw( Cmd + info->loopback_bits, info->io_base + CCAR );
+
+        /* Read to flush write to CCAR */
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                inw( info->io_base + CCAR );
+
+}       /* end of usc_RTCmd() */
+
+/*
+ * usc_DmaCmd()
+ *
+ *    Issue a DMA command to the DMA Command/Address Register (DCAR).
+ *
+ * Arguments:
+ *
+ *    info   pointer to device information structure
+ *    Cmd    DMA command mask (usc_DmaCmd_XX Macros)
+ *
+ * Return Value:
+ *
+ *       None
+ */
+static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
+{
+        /* write command mask to DCAR */
+        outw( Cmd + info->mbre_bit, info->io_base );
+
+        /* Read to flush write to DCAR */
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                inw( info->io_base );
+
+}       /* end of usc_DmaCmd() */
+
+/*
+ * usc_OutDmaReg()
+ *
+ *    Write a 16-bit value to a USC DMA register
+ *
+ * Arguments:
+ *
+ *    info      pointer to device info structure
+ *    RegAddr   register address (number) for write
+ *    RegValue  16-bit value to write to register
+ *
+ * Return Value:
+ *
+ *    None
+ *
+ */
+static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
+{
+        /* Note: The DCAR is located at the adapter base address */
+        /* Note: must preserve state of BIT8 in DCAR */
+
+        outw( RegAddr + info->mbre_bit, info->io_base );
+        outw( RegValue, info->io_base );
+
+        /* Read to flush write to DCAR */
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                inw( info->io_base );
+
+}       /* end of usc_OutDmaReg() */
+ 
+/*
+ * usc_InDmaReg()
+ *
+ *    Read a 16-bit value from a DMA register
+ *
+ * Arguments:
+ *
+ *    info     pointer to device info structure
+ *    RegAddr  register address (number) to read from
+ *
+ * Return Value:
+ *
+ *    The 16-bit value read from register
+ *
+ */
+static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
+{
+        /* Note: The DCAR is located at the adapter base address */
+        /* Note: must preserve state of BIT8 in DCAR */
+
+        outw( RegAddr + info->mbre_bit, info->io_base );
+        return inw( info->io_base );
+
+}       /* end of usc_InDmaReg() */
+
+/*
+ *
+ * usc_OutReg()
+ *
+ *    Write a 16-bit value to a USC serial channel register 
+ *
+ * Arguments:
+ *
+ *    info      pointer to device info structure
+ *    RegAddr   register address (number) to write to
+ *    RegValue  16-bit value to write to register
+ *
+ * Return Value:
+ *
+ *    None
+ *
+ */
+static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
+{
+        outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
+        outw( RegValue, info->io_base + CCAR );
+
+        /* Read to flush write to CCAR */
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                inw( info->io_base + CCAR );
+
+}       /* end of usc_OutReg() */
+
+/*
+ * usc_InReg()
+ *
+ *    Reads a 16-bit value from a USC serial channel register
+ *
+ * Arguments:
+ *
+ *    info       pointer to device extension
+ *    RegAddr    register address (number) to read from
+ *
+ * Return Value:
+ *
+ *    16-bit value read from register
+ */
+static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
+{
+        outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
+        return inw( info->io_base + CCAR );
+
+}       /* end of usc_InReg() */
+
+/* usc_set_sdlc_mode()
+ *
+ *    Set up the adapter for SDLC DMA communications.
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        NONE
+ */
+static void usc_set_sdlc_mode( struct mgsl_struct *info )
+{
+        u16 RegValue;
+        bool PreSL1660;
+        
+        /*
+         * determine if the IUSC on the adapter is pre-SL1660. If
+         * not, take advantage of the UnderWait feature of more
+         * modern chips. If an underrun occurs and this bit is set,
+         * the transmitter will idle the programmed idle pattern
+         * until the driver has time to service the underrun. Otherwise,
+         * the dma controller may get the cycles previously requested
+         * and begin transmitting queued tx data.
+         */
+        usc_OutReg(info,TMCR,0x1f);
+        RegValue=usc_InReg(info,TMDR);
+        PreSL1660 = (RegValue == IUSC_PRE_SL1660);
+
+        if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
+        {
+           /*
+           ** Channel Mode Register (CMR)
+           **
+           ** <15..14>    10    Tx Sub Modes, Send Flag on Underrun
+           ** <13>        0     0 = Transmit Disabled (initially)
+           ** <12>        0     1 = Consecutive Idles share common 0
+           ** <11..8>     1110  Transmitter Mode = HDLC/SDLC Loop
+           ** <7..4>      0000  Rx Sub Modes, addr/ctrl field handling
+           ** <3..0>      0110  Receiver Mode = HDLC/SDLC
+           **
+           ** 1000 1110 0000 0110 = 0x8e06
+           */
+           RegValue = 0x8e06;
+ 
+           /*--------------------------------------------------
+            * ignore user options for UnderRun Actions and
+            * preambles
+            *--------------------------------------------------*/
+        }
+        else
+        {       
+                /* Channel mode Register (CMR)
+                 *
+                 * <15..14>  00    Tx Sub modes, Underrun Action
+                 * <13>      0     1 = Send Preamble before opening flag
+                 * <12>      0     1 = Consecutive Idles share common 0
+                 * <11..8>   0110  Transmitter mode = HDLC/SDLC
+                 * <7..4>    0000  Rx Sub modes, addr/ctrl field handling
+                 * <3..0>    0110  Receiver mode = HDLC/SDLC
+                 *
+                 * 0000 0110 0000 0110 = 0x0606
+                 */
+                if (info->params.mode == MGSL_MODE_RAW) {
+                        RegValue = 0x0001;              /* Set Receive mode = external sync */
+
+                        usc_OutReg( info, IOCR,         /* Set IOCR DCD is RxSync Detect Input */
+                                (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
+
+                        /*
+                         * TxSubMode:
+                         *      CMR <15>                0       Don't send CRC on Tx Underrun
+                         *      CMR <14>                x       undefined
+                         *      CMR <13>                0       Send preamble before openning sync
+                         *      CMR <12>                0       Send 8-bit syncs, 1=send Syncs per TxLength
+                         *
+                         * TxMode:
+                         *      CMR <11-8)      0100    MonoSync
+                         *
+                         *      0x00 0100 xxxx xxxx  04xx
+                         */
+                        RegValue |= 0x0400;
+                }
+                else {
+
+                RegValue = 0x0606;
+
+                if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
+                        RegValue |= BIT14;
+                else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
+                        RegValue |= BIT15;
+                else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
+                        RegValue |= BIT15 + BIT14;
+                }
+
+                if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
+                        RegValue |= BIT13;
+        }
+
+        if ( info->params.mode == MGSL_MODE_HDLC &&
+                (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
+                RegValue |= BIT12;
+
+        if ( info->params.addr_filter != 0xff )
+        {
+                /* set up receive address filtering */
+                usc_OutReg( info, RSR, info->params.addr_filter );
+                RegValue |= BIT4;
+        }
+
+        usc_OutReg( info, CMR, RegValue );
+        info->cmr_value = RegValue;
+
+        /* Receiver mode Register (RMR)
+         *
+         * <15..13>  000    encoding
+         * <12..11>  00     FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
+         * <10>      1      1 = Set CRC to all 1s (use for SDLC/HDLC)
+         * <9>       0      1 = Include Receive chars in CRC
+         * <8>       1      1 = Use Abort/PE bit as abort indicator
+         * <7..6>    00     Even parity
+         * <5>       0      parity disabled
+         * <4..2>    000    Receive Char Length = 8 bits
+         * <1..0>    00     Disable Receiver
+         *
+         * 0000 0101 0000 0000 = 0x0500
+         */
+
+        RegValue = 0x0500;
+
+        switch ( info->params.encoding ) {
+        case HDLC_ENCODING_NRZB:               RegValue |= BIT13; break;
+        case HDLC_ENCODING_NRZI_MARK:          RegValue |= BIT14; break;
+        case HDLC_ENCODING_NRZI_SPACE:         RegValue |= BIT14 + BIT13; break;
+        case HDLC_ENCODING_BIPHASE_MARK:       RegValue |= BIT15; break;
+        case HDLC_ENCODING_BIPHASE_SPACE:      RegValue |= BIT15 + BIT13; break;
+        case HDLC_ENCODING_BIPHASE_LEVEL:      RegValue |= BIT15 + BIT14; break;
+        case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
+        }
+
+        if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
+                RegValue |= BIT9;
+        else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
+                RegValue |= ( BIT12 | BIT10 | BIT9 );
+
+        usc_OutReg( info, RMR, RegValue );
+
+        /* Set the Receive count Limit Register (RCLR) to 0xffff. */
+        /* When an opening flag of an SDLC frame is recognized the */
+        /* Receive Character count (RCC) is loaded with the value in */
+        /* RCLR. The RCC is decremented for each received byte.  The */
+        /* value of RCC is stored after the closing flag of the frame */
+        /* allowing the frame size to be computed. */
+
+        usc_OutReg( info, RCLR, RCLRVALUE );
+
+        usc_RCmd( info, RCmd_SelectRicrdma_level );
+
+        /* Receive Interrupt Control Register (RICR)
+         *
+         * <15..8>      ?       RxFIFO DMA Request Level
+         * <7>          0       Exited Hunt IA (Interrupt Arm)
+         * <6>          0       Idle Received IA
+         * <5>          0       Break/Abort IA
+         * <4>          0       Rx Bound IA
+         * <3>          1       Queued status reflects oldest 2 bytes in FIFO
+         * <2>          0       Abort/PE IA
+         * <1>          1       Rx Overrun IA
+         * <0>          0       Select TC0 value for readback
+         *
+         *      0000 0000 0000 1000 = 0x000a
+         */
+
+        /* Carry over the Exit Hunt and Idle Received bits */
+        /* in case they have been armed by usc_ArmEvents.   */
+
+        RegValue = usc_InReg( info, RICR ) & 0xc0;
+
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
+        else
+                usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
+
+        /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
+
+        usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
+        usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
+
+        /* Transmit mode Register (TMR)
+         *      
+         * <15..13>     000     encoding
+         * <12..11>     00      FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
+         * <10>         1       1 = Start CRC as all 1s (use for SDLC/HDLC)
+         * <9>          0       1 = Tx CRC Enabled
+         * <8>          0       1 = Append CRC to end of transmit frame
+         * <7..6>       00      Transmit parity Even
+         * <5>          0       Transmit parity Disabled
+         * <4..2>       000     Tx Char Length = 8 bits
+         * <1..0>       00      Disable Transmitter
+         *
+         *      0000 0100 0000 0000 = 0x0400
+         */
+
+        RegValue = 0x0400;
+
+        switch ( info->params.encoding ) {
+        case HDLC_ENCODING_NRZB:               RegValue |= BIT13; break;
+        case HDLC_ENCODING_NRZI_MARK:          RegValue |= BIT14; break;
+        case HDLC_ENCODING_NRZI_SPACE:         RegValue |= BIT14 + BIT13; break;
+        case HDLC_ENCODING_BIPHASE_MARK:       RegValue |= BIT15; break;
+        case HDLC_ENCODING_BIPHASE_SPACE:      RegValue |= BIT15 + BIT13; break;
+        case HDLC_ENCODING_BIPHASE_LEVEL:      RegValue |= BIT15 + BIT14; break;
+        case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
+        }
+
+        if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
+                RegValue |= BIT9 + BIT8;
+        else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
+                RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
+
+        usc_OutReg( info, TMR, RegValue );
+
+        usc_set_txidle( info );
+
+
+        usc_TCmd( info, TCmd_SelectTicrdma_level );
+
+        /* Transmit Interrupt Control Register (TICR)
+         *
+         * <15..8>      ?       Transmit FIFO DMA Level
+         * <7>          0       Present IA (Interrupt Arm)
+         * <6>          0       Idle Sent IA
+         * <5>          1       Abort Sent IA
+         * <4>          1       EOF/EOM Sent IA
+         * <3>          0       CRC Sent IA
+         * <2>          1       1 = Wait for SW Trigger to Start Frame
+         * <1>          1       Tx Underrun IA
+         * <0>          0       TC0 constant on read back
+         *
+         *      0000 0000 0011 0110 = 0x0036
+         */
+
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                usc_OutReg( info, TICR, 0x0736 );
+        else                                                            
+                usc_OutReg( info, TICR, 0x1436 );
+
+        usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
+        usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
+
+        /*
+        ** Transmit Command/Status Register (TCSR)
+        **
+        ** <15..12>     0000    TCmd
+        ** <11>         0/1     UnderWait
+        ** <10..08>     000     TxIdle
+        ** <7>          x       PreSent
+        ** <6>          x       IdleSent
+        ** <5>          x       AbortSent
+        ** <4>          x       EOF/EOM Sent
+        ** <3>          x       CRC Sent
+        ** <2>          x       All Sent
+        ** <1>          x       TxUnder
+        ** <0>          x       TxEmpty
+        ** 
+        ** 0000 0000 0000 0000 = 0x0000
+        */
+        info->tcsr_value = 0;
+
+        if ( !PreSL1660 )
+                info->tcsr_value |= TCSR_UNDERWAIT;
+                
+        usc_OutReg( info, TCSR, info->tcsr_value );
+
+        /* Clock mode Control Register (CMCR)
+         *
+         * <15..14>     00      counter 1 Source = Disabled
+         * <13..12>     00      counter 0 Source = Disabled
+         * <11..10>     11      BRG1 Input is TxC Pin
+         * <9..8>       11      BRG0 Input is TxC Pin
+         * <7..6>       01      DPLL Input is BRG1 Output
+         * <5..3>       XXX     TxCLK comes from Port 0
+         * <2..0>       XXX     RxCLK comes from Port 1
+         *
+         *      0000 1111 0111 0111 = 0x0f77
+         */
+
+        RegValue = 0x0f40;
+
+        if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
+                RegValue |= 0x0003;     /* RxCLK from DPLL */
+        else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
+                RegValue |= 0x0004;     /* RxCLK from BRG0 */
+        else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
+                RegValue |= 0x0006;     /* RxCLK from TXC Input */
+        else
+                RegValue |= 0x0007;     /* RxCLK from Port1 */
+
+        if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
+                RegValue |= 0x0018;     /* TxCLK from DPLL */
+        else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
+                RegValue |= 0x0020;     /* TxCLK from BRG0 */
+        else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
+                RegValue |= 0x0038;     /* RxCLK from TXC Input */
+        else
+                RegValue |= 0x0030;     /* TxCLK from Port0 */
+
+        usc_OutReg( info, CMCR, RegValue );
+
+
+        /* Hardware Configuration Register (HCR)
+         *
+         * <15..14>     00      CTR0 Divisor:00=32,01=16,10=8,11=4
+         * <13>         0       CTR1DSel:0=CTR0Div determines CTR0Div
+         * <12>         0       CVOK:0=report code violation in biphase
+         * <11..10>     00      DPLL Divisor:00=32,01=16,10=8,11=4
+         * <9..8>       XX      DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
+         * <7..6>       00      reserved
+         * <5>          0       BRG1 mode:0=continuous,1=single cycle
+         * <4>          X       BRG1 Enable
+         * <3..2>       00      reserved
+         * <1>          0       BRG0 mode:0=continuous,1=single cycle
+         * <0>          0       BRG0 Enable
+         */
+
+        RegValue = 0x0000;
+
+        if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
+                u32 XtalSpeed;
+                u32 DpllDivisor;
+                u16 Tc;
+
+                /*  DPLL is enabled. Use BRG1 to provide continuous reference clock  */
+                /*  for DPLL. DPLL mode in HCR is dependent on the encoding used. */
+
+                if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                        XtalSpeed = 11059200;
+                else
+                        XtalSpeed = 14745600;
+
+                if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
+                        DpllDivisor = 16;
+                        RegValue |= BIT10;
+                }
+                else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
+                        DpllDivisor = 8;
+                        RegValue |= BIT11;
+                }
+                else
+                        DpllDivisor = 32;
+
+                /*  Tc = (Xtal/Speed) - 1 */
+                /*  If twice the remainder of (Xtal/Speed) is greater than Speed */
+                /*  then rounding up gives a more precise time constant. Instead */
+                /*  of rounding up and then subtracting 1 we just don't subtract */
+                /*  the one in this case. */
+
+                /*--------------------------------------------------
+                 * ejz: for DPLL mode, application should use the
+                 * same clock speed as the partner system, even 
+                 * though clocking is derived from the input RxData.
+                 * In case the user uses a 0 for the clock speed,
+                 * default to 0xffffffff and don't try to divide by
+                 * zero
+                 *--------------------------------------------------*/
+                if ( info->params.clock_speed )
+                {
+                        Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
+                        if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
+                               / info->params.clock_speed) )
+                                Tc--;
+                }
+                else
+                        Tc = -1;
+                                  
+
+                /* Write 16-bit Time Constant for BRG1 */
+                usc_OutReg( info, TC1R, Tc );
+
+                RegValue |= BIT4;               /* enable BRG1 */
+
+                switch ( info->params.encoding ) {
+                case HDLC_ENCODING_NRZ:
+                case HDLC_ENCODING_NRZB:
+                case HDLC_ENCODING_NRZI_MARK:
+                case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
+                case HDLC_ENCODING_BIPHASE_MARK:
+                case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
+                case HDLC_ENCODING_BIPHASE_LEVEL:
+                case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
+                }
+        }
+
+        usc_OutReg( info, HCR, RegValue );
+
+
+        /* Channel Control/status Register (CCSR)
+         *
+         * <15>         X       RCC FIFO Overflow status (RO)
+         * <14>         X       RCC FIFO Not Empty status (RO)
+         * <13>         0       1 = Clear RCC FIFO (WO)
+         * <12>         X       DPLL Sync (RW)
+         * <11>         X       DPLL 2 Missed Clocks status (RO)
+         * <10>         X       DPLL 1 Missed Clock status (RO)
+         * <9..8>       00      DPLL Resync on rising and falling edges (RW)
+         * <7>          X       SDLC Loop On status (RO)
+         * <6>          X       SDLC Loop Send status (RO)
+         * <5>          1       Bypass counters for TxClk and RxClk (RW)
+         * <4..2>       000     Last Char of SDLC frame has 8 bits (RW)
+         * <1..0>       00      reserved
+         *
+         *      0000 0000 0010 0000 = 0x0020
+         */
+
+        usc_OutReg( info, CCSR, 0x1020 );
+
+
+        if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
+                usc_OutReg( info, SICR,
+                            (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
+        }
+        
+
+        /* enable Master Interrupt Enable bit (MIE) */
+        usc_EnableMasterIrqBit( info );
+
+        usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
+                                TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
+
+        /* arm RCC underflow interrupt */
+        usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
+        usc_EnableInterrupts(info, MISC);
+
+        info->mbre_bit = 0;
+        outw( 0, info->io_base );                       /* clear Master Bus Enable (DCAR) */
+        usc_DmaCmd( info, DmaCmd_ResetAllChannels );    /* disable both DMA channels */
+        info->mbre_bit = BIT8;
+        outw( BIT8, info->io_base );                    /* set Master Bus Enable (DCAR) */
+
+        if (info->bus_type == MGSL_BUS_TYPE_ISA) {
+                /* Enable DMAEN (Port 7, Bit 14) */
+                /* This connects the DMA request signal to the ISA bus */
+                usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
+        }
+
+        /* DMA Control Register (DCR)
+         *
+         * <15..14>     10      Priority mode = Alternating Tx/Rx
+         *              01      Rx has priority
+         *              00      Tx has priority
+         *
+         * <13>         1       Enable Priority Preempt per DCR<15..14>
+         *                      (WARNING DCR<11..10> must be 00 when this is 1)
+         *              0       Choose activate channel per DCR<11..10>
+         *
+         * <12>         0       Little Endian for Array/List
+         * <11..10>     00      Both Channels can use each bus grant
+         * <9..6>       0000    reserved
+         * <5>          0       7 CLK - Minimum Bus Re-request Interval
+         * <4>          0       1 = drive D/C and S/D pins
+         * <3>          1       1 = Add one wait state to all DMA cycles.
+         * <2>          0       1 = Strobe /UAS on every transfer.
+         * <1..0>       11      Addr incrementing only affects LS24 bits
+         *
+         *      0110 0000 0000 1011 = 0x600b
+         */
+
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                /* PCI adapter does not need DMA wait state */
+                usc_OutDmaReg( info, DCR, 0xa00b );
+        }
+        else
+                usc_OutDmaReg( info, DCR, 0x800b );
+
+
+        /* Receive DMA mode Register (RDMR)
+         *
+         * <15..14>     11      DMA mode = Linked List Buffer mode
+         * <13>         1       RSBinA/L = store Rx status Block in Arrary/List entry
+         * <12>         1       Clear count of List Entry after fetching
+         * <11..10>     00      Address mode = Increment
+         * <9>          1       Terminate Buffer on RxBound
+         * <8>          0       Bus Width = 16bits
+         * <7..0>       ?       status Bits (write as 0s)
+         *
+         * 1111 0010 0000 0000 = 0xf200
+         */
+
+        usc_OutDmaReg( info, RDMR, 0xf200 );
+
+
+        /* Transmit DMA mode Register (TDMR)
+         *
+         * <15..14>     11      DMA mode = Linked List Buffer mode
+         * <13>         1       TCBinA/L = fetch Tx Control Block from List entry
+         * <12>         1       Clear count of List Entry after fetching
+         * <11..10>     00      Address mode = Increment
+         * <9>          1       Terminate Buffer on end of frame
+         * <8>          0       Bus Width = 16bits
+         * <7..0>       ?       status Bits (Read Only so write as 0)
+         *
+         *      1111 0010 0000 0000 = 0xf200
+         */
+
+        usc_OutDmaReg( info, TDMR, 0xf200 );
+
+
+        /* DMA Interrupt Control Register (DICR)
+         *
+         * <15>         1       DMA Interrupt Enable
+         * <14>         0       1 = Disable IEO from USC
+         * <13>         0       1 = Don't provide vector during IntAck
+         * <12>         1       1 = Include status in Vector
+         * <10..2>      0       reserved, Must be 0s
+         * <1>          0       1 = Rx DMA Interrupt Enabled
+         * <0>          0       1 = Tx DMA Interrupt Enabled
+         *
+         *      1001 0000 0000 0000 = 0x9000
+         */
+
+        usc_OutDmaReg( info, DICR, 0x9000 );
+
+        usc_InDmaReg( info, RDMR );             /* clear pending receive DMA IRQ bits */
+        usc_InDmaReg( info, TDMR );             /* clear pending transmit DMA IRQ bits */
+        usc_OutDmaReg( info, CDIR, 0x0303 );    /* clear IUS and Pending for Tx and Rx */
+
+        /* Channel Control Register (CCR)
+         *
+         * <15..14>     10      Use 32-bit Tx Control Blocks (TCBs)
+         * <13>         0       Trigger Tx on SW Command Disabled
+         * <12>         0       Flag Preamble Disabled
+         * <11..10>     00      Preamble Length
+         * <9..8>       00      Preamble Pattern
+         * <7..6>       10      Use 32-bit Rx status Blocks (RSBs)
+         * <5>          0       Trigger Rx on SW Command Disabled
+         * <4..0>       0       reserved
+         *
+         *      1000 0000 1000 0000 = 0x8080
+         */
+
+        RegValue = 0x8080;
+
+        switch ( info->params.preamble_length ) {
+        case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
+        case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
+        case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
+        }
+
+        switch ( info->params.preamble ) {
+        case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
+        case HDLC_PREAMBLE_PATTERN_ONES:  RegValue |= BIT8; break;
+        case HDLC_PREAMBLE_PATTERN_10:    RegValue |= BIT9; break;
+        case HDLC_PREAMBLE_PATTERN_01:    RegValue |= BIT9 + BIT8; break;
+        }
+
+        usc_OutReg( info, CCR, RegValue );
+
+
+        /*
+         * Burst/Dwell Control Register
+         *
+         * <15..8>      0x20    Maximum number of transfers per bus grant
+         * <7..0>       0x00    Maximum number of clock cycles per bus grant
+         */
+
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                /* don't limit bus occupancy on PCI adapter */
+                usc_OutDmaReg( info, BDCR, 0x0000 );
+        }
+        else
+                usc_OutDmaReg( info, BDCR, 0x2000 );
+
+        usc_stop_transmitter(info);
+        usc_stop_receiver(info);
+        
+}       /* end of usc_set_sdlc_mode() */
+
+/* usc_enable_loopback()
+ *
+ * Set the 16C32 for internal loopback mode.
+ * The TxCLK and RxCLK signals are generated from the BRG0 and
+ * the TxD is looped back to the RxD internally.
+ *
+ * Arguments:           info    pointer to device instance data
+ *                      enable  1 = enable loopback, 0 = disable
+ * Return Value:        None
+ */
+static void usc_enable_loopback(struct mgsl_struct *info, int enable)
+{
+        if (enable) {
+                /* blank external TXD output */
+                usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
+        
+                /* Clock mode Control Register (CMCR)
+                 *
+                 * <15..14>     00      counter 1 Disabled
+                 * <13..12>     00      counter 0 Disabled
+                 * <11..10>     11      BRG1 Input is TxC Pin
+                 * <9..8>       11      BRG0 Input is TxC Pin
+                 * <7..6>       01      DPLL Input is BRG1 Output
+                 * <5..3>       100     TxCLK comes from BRG0
+                 * <2..0>       100     RxCLK comes from BRG0
+                 *
+                 * 0000 1111 0110 0100 = 0x0f64
+                 */
+
+                usc_OutReg( info, CMCR, 0x0f64 );
+
+                /* Write 16-bit Time Constant for BRG0 */
+                /* use clock speed if available, otherwise use 8 for diagnostics */
+                if (info->params.clock_speed) {
+                        if (info->bus_type == MGSL_BUS_TYPE_PCI)
+                                usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
+                        else
+                                usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
+                } else
+                        usc_OutReg(info, TC0R, (u16)8);
+
+                /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
+                   mode = Continuous Set Bit 0 to enable BRG0.  */
+                usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
+
+                /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
+                usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
+
+                /* set Internal Data loopback mode */
+                info->loopback_bits = 0x300;
+                outw( 0x0300, info->io_base + CCAR );
+        } else {
+                /* enable external TXD output */
+                usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
+        
+                /* clear Internal Data loopback mode */
+                info->loopback_bits = 0;
+                outw( 0,info->io_base + CCAR );
+        }
+        
+}       /* end of usc_enable_loopback() */
+
+/* usc_enable_aux_clock()
+ *
+ * Enabled the AUX clock output at the specified frequency.
+ *
+ * Arguments:
+ *
+ *      info            pointer to device extension
+ *      data_rate       data rate of clock in bits per second
+ *                      A data rate of 0 disables the AUX clock.
+ *
+ * Return Value:        None
+ */
+static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
+{
+        u32 XtalSpeed;
+        u16 Tc;
+
+        if ( data_rate ) {
+                if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                        XtalSpeed = 11059200;
+                else
+                        XtalSpeed = 14745600;
+
+
+                /* Tc = (Xtal/Speed) - 1 */
+                /* If twice the remainder of (Xtal/Speed) is greater than Speed */
+                /* then rounding up gives a more precise time constant. Instead */
+                /* of rounding up and then subtracting 1 we just don't subtract */
+                /* the one in this case. */
+
+
+                Tc = (u16)(XtalSpeed/data_rate);
+                if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
+                        Tc--;
+
+                /* Write 16-bit Time Constant for BRG0 */
+                usc_OutReg( info, TC0R, Tc );
+
+                /*
+                 * Hardware Configuration Register (HCR)
+                 * Clear Bit 1, BRG0 mode = Continuous
+                 * Set Bit 0 to enable BRG0.
+                 */
+
+                usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
+
+                /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
+                usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
+        } else {
+                /* data rate == 0 so turn off BRG0 */
+                usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
+        }
+
+}       /* end of usc_enable_aux_clock() */
+
+/*
+ *
+ * usc_process_rxoverrun_sync()
+ *
+ *              This function processes a receive overrun by resetting the
+ *              receive DMA buffers and issuing a Purge Rx FIFO command
+ *              to allow the receiver to continue receiving.
+ *
+ * Arguments:
+ *
+ *      info            pointer to device extension
+ *
+ * Return Value: None
+ */
+static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
+{
+        int start_index;
+        int end_index;
+        int frame_start_index;
+        bool start_of_frame_found = false;
+        bool end_of_frame_found = false;
+        bool reprogram_dma = false;
+
+        DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
+        u32 phys_addr;
+
+        usc_DmaCmd( info, DmaCmd_PauseRxChannel );
+        usc_RCmd( info, RCmd_EnterHuntmode );
+        usc_RTCmd( info, RTCmd_PurgeRxFifo );
+
+        /* CurrentRxBuffer points to the 1st buffer of the next */
+        /* possibly available receive frame. */
+        
+        frame_start_index = start_index = end_index = info->current_rx_buffer;
+
+        /* Search for an unfinished string of buffers. This means */
+        /* that a receive frame started (at least one buffer with */
+        /* count set to zero) but there is no terminiting buffer */
+        /* (status set to non-zero). */
+
+        while( !buffer_list[end_index].count )
+        {
+                /* Count field has been reset to zero by 16C32. */
+                /* This buffer is currently in use. */
+
+                if ( !start_of_frame_found )
+                {
+                        start_of_frame_found = true;
+                        frame_start_index = end_index;
+                        end_of_frame_found = false;
+                }
+
+                if ( buffer_list[end_index].status )
+                {
+                        /* Status field has been set by 16C32. */
+                        /* This is the last buffer of a received frame. */
+
+                        /* We want to leave the buffers for this frame intact. */
+                        /* Move on to next possible frame. */
+
+                        start_of_frame_found = false;
+                        end_of_frame_found = true;
+                }
+
+                /* advance to next buffer entry in linked list */
+                end_index++;
+                if ( end_index == info->rx_buffer_count )
+                        end_index = 0;
+
+                if ( start_index == end_index )
+                {
+                        /* The entire list has been searched with all Counts == 0 and */
+                        /* all Status == 0. The receive buffers are */
+                        /* completely screwed, reset all receive buffers! */
+                        mgsl_reset_rx_dma_buffers( info );
+                        frame_start_index = 0;
+                        start_of_frame_found = false;
+                        reprogram_dma = true;
+                        break;
+                }
+        }
+
+        if ( start_of_frame_found && !end_of_frame_found )
+        {
+                /* There is an unfinished string of receive DMA buffers */
+                /* as a result of the receiver overrun. */
+
+                /* Reset the buffers for the unfinished frame */
+                /* and reprogram the receive DMA controller to start */
+                /* at the 1st buffer of unfinished frame. */
+
+                start_index = frame_start_index;
+
+                do
+                {
+                        *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
+
+                        /* Adjust index for wrap around. */
+                        if ( start_index == info->rx_buffer_count )
+                                start_index = 0;
+
+                } while( start_index != end_index );
+
+                reprogram_dma = true;
+        }
+
+        if ( reprogram_dma )
+        {
+                usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
+                usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
+                usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
+                
+                usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
+                
+                /* This empties the receive FIFO and loads the RCC with RCLR */
+                usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
+
+                /* program 16C32 with physical address of 1st DMA buffer entry */
+                phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
+                usc_OutDmaReg( info, NRARL, (u16)phys_addr );
+                usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
+
+                usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
+                usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
+                usc_EnableInterrupts( info, RECEIVE_STATUS );
+
+                /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
+                /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
+
+                usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
+                usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
+                usc_DmaCmd( info, DmaCmd_InitRxChannel );
+                if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
+                        usc_EnableReceiver(info,ENABLE_AUTO_DCD);
+                else
+                        usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
+        }
+        else
+        {
+                /* This empties the receive FIFO and loads the RCC with RCLR */
+                usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
+                usc_RTCmd( info, RTCmd_PurgeRxFifo );
+        }
+
+}       /* end of usc_process_rxoverrun_sync() */
+
+/* usc_stop_receiver()
+ *
+ *      Disable USC receiver
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_stop_receiver( struct mgsl_struct *info )
+{
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):usc_stop_receiver(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+                         
+        /* Disable receive DMA channel. */
+        /* This also disables receive DMA channel interrupts */
+        usc_DmaCmd( info, DmaCmd_ResetRxChannel );
+
+        usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
+        usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
+        usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
+
+        usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
+
+        /* This empties the receive FIFO and loads the RCC with RCLR */
+        usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
+        usc_RTCmd( info, RTCmd_PurgeRxFifo );
+
+        info->rx_enabled = false;
+        info->rx_overflow = false;
+        info->rx_rcc_underrun = false;
+        
+}       /* end of stop_receiver() */
+
+/* usc_start_receiver()
+ *
+ *      Enable the USC receiver 
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_start_receiver( struct mgsl_struct *info )
+{
+        u32 phys_addr;
+        
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):usc_start_receiver(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        mgsl_reset_rx_dma_buffers( info );
+        usc_stop_receiver( info );
+
+        usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
+        usc_RTCmd( info, RTCmd_PurgeRxFifo );
+
+        if ( info->params.mode == MGSL_MODE_HDLC ||
+                info->params.mode == MGSL_MODE_RAW ) {
+                /* DMA mode Transfers */
+                /* Program the DMA controller. */
+                /* Enable the DMA controller end of buffer interrupt. */
+
+                /* program 16C32 with physical address of 1st DMA buffer entry */
+                phys_addr = info->rx_buffer_list[0].phys_entry;
+                usc_OutDmaReg( info, NRARL, (u16)phys_addr );
+                usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
+
+                usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
+                usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
+                usc_EnableInterrupts( info, RECEIVE_STATUS );
+
+                /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
+                /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
+
+                usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
+                usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
+                usc_DmaCmd( info, DmaCmd_InitRxChannel );
+                if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
+                        usc_EnableReceiver(info,ENABLE_AUTO_DCD);
+                else
+                        usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
+        } else {
+                usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
+                usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
+                usc_EnableInterrupts(info, RECEIVE_DATA);
+
+                usc_RTCmd( info, RTCmd_PurgeRxFifo );
+                usc_RCmd( info, RCmd_EnterHuntmode );
+
+                usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
+        }
+
+        usc_OutReg( info, CCSR, 0x1020 );
+
+        info->rx_enabled = true;
+
+}       /* end of usc_start_receiver() */
+
+/* usc_start_transmitter()
+ *
+ *      Enable the USC transmitter and send a transmit frame if
+ *      one is loaded in the DMA buffers.
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_start_transmitter( struct mgsl_struct *info )
+{
+        u32 phys_addr;
+        unsigned int FrameSize;
+
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):usc_start_transmitter(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+                         
+        if ( info->xmit_cnt ) {
+
+                /* If auto RTS enabled and RTS is inactive, then assert */
+                /* RTS and set a flag indicating that the driver should */
+                /* negate RTS when the transmission completes. */
+
+                info->drop_rts_on_tx_done = false;
+
+                if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
+                        usc_get_serial_signals( info );
+                        if ( !(info->serial_signals & SerialSignal_RTS) ) {
+                                info->serial_signals |= SerialSignal_RTS;
+                                usc_set_serial_signals( info );
+                                info->drop_rts_on_tx_done = true;
+                        }
+                }
+
+
+                if ( info->params.mode == MGSL_MODE_ASYNC ) {
+                        if ( !info->tx_active ) {
+                                usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
+                                usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
+                                usc_EnableInterrupts(info, TRANSMIT_DATA);
+                                usc_load_txfifo(info);
+                        }
+                } else {
+                        /* Disable transmit DMA controller while programming. */
+                        usc_DmaCmd( info, DmaCmd_ResetTxChannel );
+                        
+                        /* Transmit DMA buffer is loaded, so program USC */
+                        /* to send the frame contained in the buffers.   */
+
+                        FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
+
+                        /* if operating in Raw sync mode, reset the rcc component
+                         * of the tx dma buffer entry, otherwise, the serial controller
+                         * will send a closing sync char after this count.
+                         */
+                        if ( info->params.mode == MGSL_MODE_RAW )
+                                info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
+
+                        /* Program the Transmit Character Length Register (TCLR) */
+                        /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
+                        usc_OutReg( info, TCLR, (u16)FrameSize );
+
+                        usc_RTCmd( info, RTCmd_PurgeTxFifo );
+
+                        /* Program the address of the 1st DMA Buffer Entry in linked list */
+                        phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
+                        usc_OutDmaReg( info, NTARL, (u16)phys_addr );
+                        usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
+
+                        usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
+                        usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
+                        usc_EnableInterrupts( info, TRANSMIT_STATUS );
+
+                        if ( info->params.mode == MGSL_MODE_RAW &&
+                                        info->num_tx_dma_buffers > 1 ) {
+                           /* When running external sync mode, attempt to 'stream' transmit  */
+                           /* by filling tx dma buffers as they become available. To do this */
+                           /* we need to enable Tx DMA EOB Status interrupts :               */
+                           /*                                                                */
+                           /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
+                           /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
+
+                           usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
+                           usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
+                        }
+
+                        /* Initialize Transmit DMA Channel */
+                        usc_DmaCmd( info, DmaCmd_InitTxChannel );
+                        
+                        usc_TCmd( info, TCmd_SendFrame );
+                        
+                        mod_timer(&info->tx_timer, jiffies +
+                                        msecs_to_jiffies(5000));
+                }
+                info->tx_active = true;
+        }
+
+        if ( !info->tx_enabled ) {
+                info->tx_enabled = true;
+                if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
+                        usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
+                else
+                        usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
+        }
+
+}       /* end of usc_start_transmitter() */
+
+/* usc_stop_transmitter()
+ *
+ *      Stops the transmitter and DMA
+ *
+ * Arguments:           info    pointer to device isntance data
+ * Return Value:        None
+ */
+static void usc_stop_transmitter( struct mgsl_struct *info )
+{
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):usc_stop_transmitter(%s)\n",
+                         __FILE__,__LINE__, info->device_name );
+                         
+        del_timer(&info->tx_timer);     
+                         
+        usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
+        usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
+        usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
+
+        usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
+        usc_DmaCmd( info, DmaCmd_ResetTxChannel );
+        usc_RTCmd( info, RTCmd_PurgeTxFifo );
+
+        info->tx_enabled = false;
+        info->tx_active = false;
+
+}       /* end of usc_stop_transmitter() */
+
+/* usc_load_txfifo()
+ *
+ *      Fill the transmit FIFO until the FIFO is full or
+ *      there is no more data to load.
+ *
+ * Arguments:           info    pointer to device extension (instance data)
+ * Return Value:        None
+ */
+static void usc_load_txfifo( struct mgsl_struct *info )
+{
+        int Fifocount;
+        u8 TwoBytes[2];
+        
+        if ( !info->xmit_cnt && !info->x_char )
+                return; 
+                
+        /* Select transmit FIFO status readback in TICR */
+        usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
+
+        /* load the Transmit FIFO until FIFOs full or all data sent */
+
+        while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
+                /* there is more space in the transmit FIFO and */
+                /* there is more data in transmit buffer */
+
+                if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
+                        /* write a 16-bit word from transmit buffer to 16C32 */
+                                
+                        TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
+                        info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+                        TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
+                        info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+                        
+                        outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
+                                
+                        info->xmit_cnt -= 2;
+                        info->icount.tx += 2;
+                } else {
+                        /* only 1 byte left to transmit or 1 FIFO slot left */
+                        
+                        outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
+                                info->io_base + CCAR );
+                        
+                        if (info->x_char) {
+                                /* transmit pending high priority char */
+                                outw( info->x_char,info->io_base + CCAR );
+                                info->x_char = 0;
+                        } else {
+                                outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
+                                info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+                                info->xmit_cnt--;
+                        }
+                        info->icount.tx++;
+                }
+        }
+
+}       /* end of usc_load_txfifo() */
+
+/* usc_reset()
+ *
+ *      Reset the adapter to a known state and prepare it for further use.
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_reset( struct mgsl_struct *info )
+{
+        if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
+                int i;
+                u32 readval;
+
+                /* Set BIT30 of Misc Control Register */
+                /* (Local Control Register 0x50) to force reset of USC. */
+
+                volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
+                u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
+
+                info->misc_ctrl_value |= BIT30;
+                *MiscCtrl = info->misc_ctrl_value;
+
+                /*
+                 * Force at least 170ns delay before clearing 
+                 * reset bit. Each read from LCR takes at least 
+                 * 30ns so 10 times for 300ns to be safe.
+                 */
+                for(i=0;i<10;i++)
+                        readval = *MiscCtrl;
+
+                info->misc_ctrl_value &= ~BIT30;
+                *MiscCtrl = info->misc_ctrl_value;
+
+                *LCR0BRDR = BUS_DESCRIPTOR(
+                        1,              // Write Strobe Hold (0-3)
+                        2,              // Write Strobe Delay (0-3)
+                        2,              // Read Strobe Delay  (0-3)
+                        0,              // NWDD (Write data-data) (0-3)
+                        4,              // NWAD (Write Addr-data) (0-31)
+                        0,              // NXDA (Read/Write Data-Addr) (0-3)
+                        0,              // NRDD (Read Data-Data) (0-3)
+                        5               // NRAD (Read Addr-Data) (0-31)
+                        );
+        } else {
+                /* do HW reset */
+                outb( 0,info->io_base + 8 );
+        }
+
+        info->mbre_bit = 0;
+        info->loopback_bits = 0;
+        info->usc_idle_mode = 0;
+
+        /*
+         * Program the Bus Configuration Register (BCR)
+         *
+         * <15>         0       Don't use separate address
+         * <14..6>      0       reserved
+         * <5..4>       00      IAckmode = Default, don't care
+         * <3>          1       Bus Request Totem Pole output
+         * <2>          1       Use 16 Bit data bus
+         * <1>          0       IRQ Totem Pole output
+         * <0>          0       Don't Shift Right Addr
+         *
+         * 0000 0000 0000 1100 = 0x000c
+         *
+         * By writing to io_base + SDPIN the Wait/Ack pin is
+         * programmed to work as a Wait pin.
+         */
+        
+        outw( 0x000c,info->io_base + SDPIN );
+
+
+        outw( 0,info->io_base );
+        outw( 0,info->io_base + CCAR );
+
+        /* select little endian byte ordering */
+        usc_RTCmd( info, RTCmd_SelectLittleEndian );
+
+
+        /* Port Control Register (PCR)
+         *
+         * <15..14>     11      Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
+         * <13..12>     11      Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
+         * <11..10>     00      Port 5 is Input (No Connect, Don't Care)
+         * <9..8>       00      Port 4 is Input (No Connect, Don't Care)
+         * <7..6>       11      Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
+         * <5..4>       11      Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
+         * <3..2>       01      Port 1 is Input (Dedicated RxC)
+         * <1..0>       01      Port 0 is Input (Dedicated TxC)
+         *
+         *      1111 0000 1111 0101 = 0xf0f5
+         */
+
+        usc_OutReg( info, PCR, 0xf0f5 );
+
+
+        /*
+         * Input/Output Control Register
+         *
+         * <15..14>     00      CTS is active low input
+         * <13..12>     00      DCD is active low input
+         * <11..10>     00      TxREQ pin is input (DSR)
+         * <9..8>       00      RxREQ pin is input (RI)
+         * <7..6>       00      TxD is output (Transmit Data)
+         * <5..3>       000     TxC Pin in Input (14.7456MHz Clock)
+         * <2..0>       100     RxC is Output (drive with BRG0)
+         *
+         *      0000 0000 0000 0100 = 0x0004
+         */
+
+        usc_OutReg( info, IOCR, 0x0004 );
+
+}       /* end of usc_reset() */
+
+/* usc_set_async_mode()
+ *
+ *      Program adapter for asynchronous communications.
+ *
+ * Arguments:           info            pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_set_async_mode( struct mgsl_struct *info )
+{
+        u16 RegValue;
+
+        /* disable interrupts while programming USC */
+        usc_DisableMasterIrqBit( info );
+
+        outw( 0, info->io_base );                       /* clear Master Bus Enable (DCAR) */
+        usc_DmaCmd( info, DmaCmd_ResetAllChannels );    /* disable both DMA channels */
+
+        usc_loopback_frame( info );
+
+        /* Channel mode Register (CMR)
+         *
+         * <15..14>     00      Tx Sub modes, 00 = 1 Stop Bit
+         * <13..12>     00                    00 = 16X Clock
+         * <11..8>      0000    Transmitter mode = Asynchronous
+         * <7..6>       00      reserved?
+         * <5..4>       00      Rx Sub modes, 00 = 16X Clock
+         * <3..0>       0000    Receiver mode = Asynchronous
+         *
+         * 0000 0000 0000 0000 = 0x0
+         */
+
+        RegValue = 0;
+        if ( info->params.stop_bits != 1 )
+                RegValue |= BIT14;
+        usc_OutReg( info, CMR, RegValue );
+
+        
+        /* Receiver mode Register (RMR)
+         *
+         * <15..13>     000     encoding = None
+         * <12..08>     00000   reserved (Sync Only)
+         * <7..6>       00      Even parity
+         * <5>          0       parity disabled
+         * <4..2>       000     Receive Char Length = 8 bits
+         * <1..0>       00      Disable Receiver
+         *
+         * 0000 0000 0000 0000 = 0x0
+         */
+
+        RegValue = 0;
+
+        if ( info->params.data_bits != 8 )
+                RegValue |= BIT4+BIT3+BIT2;
+
+        if ( info->params.parity != ASYNC_PARITY_NONE ) {
+                RegValue |= BIT5;
+                if ( info->params.parity != ASYNC_PARITY_ODD )
+                        RegValue |= BIT6;
+        }
+
+        usc_OutReg( info, RMR, RegValue );
+
+
+        /* Set IRQ trigger level */
+
+        usc_RCmd( info, RCmd_SelectRicrIntLevel );
+
+        
+        /* Receive Interrupt Control Register (RICR)
+         *
+         * <15..8>      ?               RxFIFO IRQ Request Level
+         *
+         * Note: For async mode the receive FIFO level must be set
+         * to 0 to avoid the situation where the FIFO contains fewer bytes
+         * than the trigger level and no more data is expected.
+         *
+         * <7>          0               Exited Hunt IA (Interrupt Arm)
+         * <6>          0               Idle Received IA
+         * <5>          0               Break/Abort IA
+         * <4>          0               Rx Bound IA
+         * <3>          0               Queued status reflects oldest byte in FIFO
+         * <2>          0               Abort/PE IA
+         * <1>          0               Rx Overrun IA
+         * <0>          0               Select TC0 value for readback
+         *
+         * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
+         */
+        
+        usc_OutReg( info, RICR, 0x0000 );
+
+        usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
+        usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
+
+        
+        /* Transmit mode Register (TMR)
+         *
+         * <15..13>     000     encoding = None
+         * <12..08>     00000   reserved (Sync Only)
+         * <7..6>       00      Transmit parity Even
+         * <5>          0       Transmit parity Disabled
+         * <4..2>       000     Tx Char Length = 8 bits
+         * <1..0>       00      Disable Transmitter
+         *
+         * 0000 0000 0000 0000 = 0x0
+         */
+
+        RegValue = 0;
+
+        if ( info->params.data_bits != 8 )
+                RegValue |= BIT4+BIT3+BIT2;
+
+        if ( info->params.parity != ASYNC_PARITY_NONE ) {
+                RegValue |= BIT5;
+                if ( info->params.parity != ASYNC_PARITY_ODD )
+                        RegValue |= BIT6;
+        }
+
+        usc_OutReg( info, TMR, RegValue );
+
+        usc_set_txidle( info );
+
+
+        /* Set IRQ trigger level */
+
+        usc_TCmd( info, TCmd_SelectTicrIntLevel );
+
+        
+        /* Transmit Interrupt Control Register (TICR)
+         *
+         * <15..8>      ?       Transmit FIFO IRQ Level
+         * <7>          0       Present IA (Interrupt Arm)
+         * <6>          1       Idle Sent IA
+         * <5>          0       Abort Sent IA
+         * <4>          0       EOF/EOM Sent IA
+         * <3>          0       CRC Sent IA
+         * <2>          0       1 = Wait for SW Trigger to Start Frame
+         * <1>          0       Tx Underrun IA
+         * <0>          0       TC0 constant on read back
+         *
+         *      0000 0000 0100 0000 = 0x0040
+         */
+
+        usc_OutReg( info, TICR, 0x1f40 );
+
+        usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
+        usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
+
+        usc_enable_async_clock( info, info->params.data_rate );
+
+        
+        /* Channel Control/status Register (CCSR)
+         *
+         * <15>         X       RCC FIFO Overflow status (RO)
+         * <14>         X       RCC FIFO Not Empty status (RO)
+         * <13>         0       1 = Clear RCC FIFO (WO)
+         * <12>         X       DPLL in Sync status (RO)
+         * <11>         X       DPLL 2 Missed Clocks status (RO)
+         * <10>         X       DPLL 1 Missed Clock status (RO)
+         * <9..8>       00      DPLL Resync on rising and falling edges (RW)
+         * <7>          X       SDLC Loop On status (RO)
+         * <6>          X       SDLC Loop Send status (RO)
+         * <5>          1       Bypass counters for TxClk and RxClk (RW)
+         * <4..2>       000     Last Char of SDLC frame has 8 bits (RW)
+         * <1..0>       00      reserved
+         *
+         *      0000 0000 0010 0000 = 0x0020
+         */
+        
+        usc_OutReg( info, CCSR, 0x0020 );
+
+        usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
+                              RECEIVE_DATA + RECEIVE_STATUS );
+
+        usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
+                                RECEIVE_DATA + RECEIVE_STATUS );
+
+        usc_EnableMasterIrqBit( info );
+
+        if (info->bus_type == MGSL_BUS_TYPE_ISA) {
+                /* Enable INTEN (Port 6, Bit12) */
+                /* This connects the IRQ request signal to the ISA bus */
+                usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
+        }
+
+        if (info->params.loopback) {
+                info->loopback_bits = 0x300;
+                outw(0x0300, info->io_base + CCAR);
+        }
+
+}       /* end of usc_set_async_mode() */
+
+/* usc_loopback_frame()
+ *
+ *      Loop back a small (2 byte) dummy SDLC frame.
+ *      Interrupts and DMA are NOT used. The purpose of this is to
+ *      clear any 'stale' status info left over from running in async mode.
+ *
+ *      The 16C32 shows the strange behaviour of marking the 1st
+ *      received SDLC frame with a CRC error even when there is no
+ *      CRC error. To get around this a small dummy from of 2 bytes
+ *      is looped back when switching from async to sync mode.
+ *
+ * Arguments:           info            pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_loopback_frame( struct mgsl_struct *info )
+{
+        int i;
+        unsigned long oldmode = info->params.mode;
+
+        info->params.mode = MGSL_MODE_HDLC;
+        
+        usc_DisableMasterIrqBit( info );
+
+        usc_set_sdlc_mode( info );
+        usc_enable_loopback( info, 1 );
+
+        /* Write 16-bit Time Constant for BRG0 */
+        usc_OutReg( info, TC0R, 0 );
+        
+        /* Channel Control Register (CCR)
+         *
+         * <15..14>     00      Don't use 32-bit Tx Control Blocks (TCBs)
+         * <13>         0       Trigger Tx on SW Command Disabled
+         * <12>         0       Flag Preamble Disabled
+         * <11..10>     00      Preamble Length = 8-Bits
+         * <9..8>       01      Preamble Pattern = flags
+         * <7..6>       10      Don't use 32-bit Rx status Blocks (RSBs)
+         * <5>          0       Trigger Rx on SW Command Disabled
+         * <4..0>       0       reserved
+         *
+         *      0000 0001 0000 0000 = 0x0100
+         */
+
+        usc_OutReg( info, CCR, 0x0100 );
+
+        /* SETUP RECEIVER */
+        usc_RTCmd( info, RTCmd_PurgeRxFifo );
+        usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
+
+        /* SETUP TRANSMITTER */
+        /* Program the Transmit Character Length Register (TCLR) */
+        /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
+        usc_OutReg( info, TCLR, 2 );
+        usc_RTCmd( info, RTCmd_PurgeTxFifo );
+
+        /* unlatch Tx status bits, and start transmit channel. */
+        usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
+        outw(0,info->io_base + DATAREG);
+
+        /* ENABLE TRANSMITTER */
+        usc_TCmd( info, TCmd_SendFrame );
+        usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
+                                                        
+        /* WAIT FOR RECEIVE COMPLETE */
+        for (i=0 ; i<1000 ; i++)
+                if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
+                        break;
+
+        /* clear Internal Data loopback mode */
+        usc_enable_loopback(info, 0);
+
+        usc_EnableMasterIrqBit(info);
+
+        info->params.mode = oldmode;
+
+}       /* end of usc_loopback_frame() */
+
+/* usc_set_sync_mode()  Programs the USC for SDLC communications.
+ *
+ * Arguments:           info    pointer to adapter info structure
+ * Return Value:        None
+ */
+static void usc_set_sync_mode( struct mgsl_struct *info )
+{
+        usc_loopback_frame( info );
+        usc_set_sdlc_mode( info );
+
+        if (info->bus_type == MGSL_BUS_TYPE_ISA) {
+                /* Enable INTEN (Port 6, Bit12) */
+                /* This connects the IRQ request signal to the ISA bus */
+                usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
+        }
+
+        usc_enable_aux_clock(info, info->params.clock_speed);
+
+        if (info->params.loopback)
+                usc_enable_loopback(info,1);
+
+}       /* end of mgsl_set_sync_mode() */
+
+/* usc_set_txidle()     Set the HDLC idle mode for the transmitter.
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_set_txidle( struct mgsl_struct *info )
+{
+        u16 usc_idle_mode = IDLEMODE_FLAGS;
+
+        /* Map API idle mode to USC register bits */
+
+        switch( info->idle_mode ){
+        case HDLC_TXIDLE_FLAGS:                 usc_idle_mode = IDLEMODE_FLAGS; break;
+        case HDLC_TXIDLE_ALT_ZEROS_ONES:        usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
+        case HDLC_TXIDLE_ZEROS:                 usc_idle_mode = IDLEMODE_ZERO; break;
+        case HDLC_TXIDLE_ONES:                  usc_idle_mode = IDLEMODE_ONE; break;
+        case HDLC_TXIDLE_ALT_MARK_SPACE:        usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
+        case HDLC_TXIDLE_SPACE:                 usc_idle_mode = IDLEMODE_SPACE; break;
+        case HDLC_TXIDLE_MARK:                  usc_idle_mode = IDLEMODE_MARK; break;
+        }
+
+        info->usc_idle_mode = usc_idle_mode;
+        //usc_OutReg(info, TCSR, usc_idle_mode);
+        info->tcsr_value &= ~IDLEMODE_MASK;     /* clear idle mode bits */
+        info->tcsr_value += usc_idle_mode;
+        usc_OutReg(info, TCSR, info->tcsr_value);
+
+        /*
+         * if SyncLink WAN adapter is running in external sync mode, the
+         * transmitter has been set to Monosync in order to try to mimic
+         * a true raw outbound bit stream. Monosync still sends an open/close
+         * sync char at the start/end of a frame. Try to match those sync
+         * patterns to the idle mode set here
+         */
+        if ( info->params.mode == MGSL_MODE_RAW ) {
+                unsigned char syncpat = 0;
+                switch( info->idle_mode ) {
+                case HDLC_TXIDLE_FLAGS:
+                        syncpat = 0x7e;
+                        break;
+                case HDLC_TXIDLE_ALT_ZEROS_ONES:
+                        syncpat = 0x55;
+                        break;
+                case HDLC_TXIDLE_ZEROS:
+                case HDLC_TXIDLE_SPACE:
+                        syncpat = 0x00;
+                        break;
+                case HDLC_TXIDLE_ONES:
+                case HDLC_TXIDLE_MARK:
+                        syncpat = 0xff;
+                        break;
+                case HDLC_TXIDLE_ALT_MARK_SPACE:
+                        syncpat = 0xaa;
+                        break;
+                }
+
+                usc_SetTransmitSyncChars(info,syncpat,syncpat);
+        }
+
+}       /* end of usc_set_txidle() */
+
+/* usc_get_serial_signals()
+ *
+ *      Query the adapter for the state of the V24 status (input) signals.
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_get_serial_signals( struct mgsl_struct *info )
+{
+        u16 status;
+
+        /* clear all serial signals except DTR and RTS */
+        info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
+
+        /* Read the Misc Interrupt status Register (MISR) to get */
+        /* the V24 status signals. */
+
+        status = usc_InReg( info, MISR );
+
+        /* set serial signal bits to reflect MISR */
+
+        if ( status & MISCSTATUS_CTS )
+                info->serial_signals |= SerialSignal_CTS;
+
+        if ( status & MISCSTATUS_DCD )
+                info->serial_signals |= SerialSignal_DCD;
+
+        if ( status & MISCSTATUS_RI )
+                info->serial_signals |= SerialSignal_RI;
+
+        if ( status & MISCSTATUS_DSR )
+                info->serial_signals |= SerialSignal_DSR;
+
+}       /* end of usc_get_serial_signals() */
+
+/* usc_set_serial_signals()
+ *
+ *      Set the state of DTR and RTS based on contents of
+ *      serial_signals member of device extension.
+ *      
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void usc_set_serial_signals( struct mgsl_struct *info )
+{
+        u16 Control;
+        unsigned char V24Out = info->serial_signals;
+
+        /* get the current value of the Port Control Register (PCR) */
+
+        Control = usc_InReg( info, PCR );
+
+        if ( V24Out & SerialSignal_RTS )
+                Control &= ~(BIT6);
+        else
+                Control |= BIT6;
+
+        if ( V24Out & SerialSignal_DTR )
+                Control &= ~(BIT4);
+        else
+                Control |= BIT4;
+
+        usc_OutReg( info, PCR, Control );
+
+}       /* end of usc_set_serial_signals() */
+
+/* usc_enable_async_clock()
+ *
+ *      Enable the async clock at the specified frequency.
+ *
+ * Arguments:           info            pointer to device instance data
+ *                      data_rate       data rate of clock in bps
+ *                                      0 disables the AUX clock.
+ * Return Value:        None
+ */
+static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
+{
+        if ( data_rate )        {
+                /*
+                 * Clock mode Control Register (CMCR)
+                 * 
+                 * <15..14>     00      counter 1 Disabled
+                 * <13..12>     00      counter 0 Disabled
+                 * <11..10>     11      BRG1 Input is TxC Pin
+                 * <9..8>       11      BRG0 Input is TxC Pin
+                 * <7..6>       01      DPLL Input is BRG1 Output
+                 * <5..3>       100     TxCLK comes from BRG0
+                 * <2..0>       100     RxCLK comes from BRG0
+                 *
+                 * 0000 1111 0110 0100 = 0x0f64
+                 */
+                
+                usc_OutReg( info, CMCR, 0x0f64 );
+
+
+                /*
+                 * Write 16-bit Time Constant for BRG0
+                 * Time Constant = (ClkSpeed / data_rate) - 1
+                 * ClkSpeed = 921600 (ISA), 691200 (PCI)
+                 */
+
+                if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                        usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
+                else
+                        usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
+
+                
+                /*
+                 * Hardware Configuration Register (HCR)
+                 * Clear Bit 1, BRG0 mode = Continuous
+                 * Set Bit 0 to enable BRG0.
+                 */
+
+                usc_OutReg( info, HCR,
+                            (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
+
+
+                /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
+
+                usc_OutReg( info, IOCR,
+                            (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
+        } else {
+                /* data rate == 0 so turn off BRG0 */
+                usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
+        }
+
+}       /* end of usc_enable_async_clock() */
+
+/*
+ * Buffer Structures:
+ *
+ * Normal memory access uses virtual addresses that can make discontiguous
+ * physical memory pages appear to be contiguous in the virtual address
+ * space (the processors memory mapping handles the conversions).
+ *
+ * DMA transfers require physically contiguous memory. This is because
+ * the DMA system controller and DMA bus masters deal with memory using
+ * only physical addresses.
+ *
+ * This causes a problem under Windows NT when large DMA buffers are
+ * needed. Fragmentation of the nonpaged pool prevents allocations of
+ * physically contiguous buffers larger than the PAGE_SIZE.
+ *
+ * However the 16C32 supports Bus Master Scatter/Gather DMA which
+ * allows DMA transfers to physically discontiguous buffers. Information
+ * about each data transfer buffer is contained in a memory structure
+ * called a 'buffer entry'. A list of buffer entries is maintained
+ * to track and control the use of the data transfer buffers.
+ *
+ * To support this strategy we will allocate sufficient PAGE_SIZE
+ * contiguous memory buffers to allow for the total required buffer
+ * space.
+ *
+ * The 16C32 accesses the list of buffer entries using Bus Master
+ * DMA. Control information is read from the buffer entries by the
+ * 16C32 to control data transfers. status information is written to
+ * the buffer entries by the 16C32 to indicate the status of completed
+ * transfers.
+ *
+ * The CPU writes control information to the buffer entries to control
+ * the 16C32 and reads status information from the buffer entries to
+ * determine information about received and transmitted frames.
+ *
+ * Because the CPU and 16C32 (adapter) both need simultaneous access
+ * to the buffer entries, the buffer entry memory is allocated with
+ * HalAllocateCommonBuffer(). This restricts the size of the buffer
+ * entry list to PAGE_SIZE.
+ *
+ * The actual data buffers on the other hand will only be accessed
+ * by the CPU or the adapter but not by both simultaneously. This allows
+ * Scatter/Gather packet based DMA procedures for using physically
+ * discontiguous pages.
+ */
+
+/*
+ * mgsl_reset_tx_dma_buffers()
+ *
+ *      Set the count for all transmit buffers to 0 to indicate the
+ *      buffer is available for use and set the current buffer to the
+ *      first buffer. This effectively makes all buffers free and
+ *      discards any data in buffers.
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
+{
+        unsigned int i;
+
+        for ( i = 0; i < info->tx_buffer_count; i++ ) {
+                *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
+        }
+
+        info->current_tx_buffer = 0;
+        info->start_tx_dma_buffer = 0;
+        info->tx_dma_buffers_used = 0;
+
+        info->get_tx_holding_index = 0;
+        info->put_tx_holding_index = 0;
+        info->tx_holding_count = 0;
+
+}       /* end of mgsl_reset_tx_dma_buffers() */
+
+/*
+ * num_free_tx_dma_buffers()
+ *
+ *      returns the number of free tx dma buffers available
+ *
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        number of free tx dma buffers
+ */
+static int num_free_tx_dma_buffers(struct mgsl_struct *info)
+{
+        return info->tx_buffer_count - info->tx_dma_buffers_used;
+}
+
+/*
+ * mgsl_reset_rx_dma_buffers()
+ * 
+ *      Set the count for all receive buffers to DMABUFFERSIZE
+ *      and set the current buffer to the first buffer. This effectively
+ *      makes all buffers free and discards any data in buffers.
+ * 
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
+{
+        unsigned int i;
+
+        for ( i = 0; i < info->rx_buffer_count; i++ ) {
+                *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
+//              info->rx_buffer_list[i].count = DMABUFFERSIZE;
+//              info->rx_buffer_list[i].status = 0;
+        }
+
+        info->current_rx_buffer = 0;
+
+}       /* end of mgsl_reset_rx_dma_buffers() */
+
+/*
+ * mgsl_free_rx_frame_buffers()
+ * 
+ *      Free the receive buffers used by a received SDLC
+ *      frame such that the buffers can be reused.
+ * 
+ * Arguments:
+ * 
+ *      info                    pointer to device instance data
+ *      StartIndex              index of 1st receive buffer of frame
+ *      EndIndex                index of last receive buffer of frame
+ * 
+ * Return Value:        None
+ */
+static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
+{
+        bool Done = false;
+        DMABUFFERENTRY *pBufEntry;
+        unsigned int Index;
+
+        /* Starting with 1st buffer entry of the frame clear the status */
+        /* field and set the count field to DMA Buffer Size. */
+
+        Index = StartIndex;
+
+        while( !Done ) {
+                pBufEntry = &(info->rx_buffer_list[Index]);
+
+                if ( Index == EndIndex ) {
+                        /* This is the last buffer of the frame! */
+                        Done = true;
+                }
+
+                /* reset current buffer for reuse */
+//              pBufEntry->status = 0;
+//              pBufEntry->count = DMABUFFERSIZE;
+                *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
+
+                /* advance to next buffer entry in linked list */
+                Index++;
+                if ( Index == info->rx_buffer_count )
+                        Index = 0;
+        }
+
+        /* set current buffer to next buffer after last buffer of frame */
+        info->current_rx_buffer = Index;
+
+}       /* end of free_rx_frame_buffers() */
+
+/* mgsl_get_rx_frame()
+ * 
+ *      This function attempts to return a received SDLC frame from the
+ *      receive DMA buffers. Only frames received without errors are returned.
+ *
+ * Arguments:           info    pointer to device extension
+ * Return Value:        true if frame returned, otherwise false
+ */
+static bool mgsl_get_rx_frame(struct mgsl_struct *info)
+{
+        unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
+        unsigned short status;
+        DMABUFFERENTRY *pBufEntry;
+        unsigned int framesize = 0;
+        bool ReturnCode = false;
+        unsigned long flags;
+        struct tty_struct *tty = info->port.tty;
+        bool return_frame = false;
+        
+        /*
+         * current_rx_buffer points to the 1st buffer of the next available
+         * receive frame. To find the last buffer of the frame look for
+         * a non-zero status field in the buffer entries. (The status
+         * field is set by the 16C32 after completing a receive frame.
+         */
+
+        StartIndex = EndIndex = info->current_rx_buffer;
+
+        while( !info->rx_buffer_list[EndIndex].status ) {
+                /*
+                 * If the count field of the buffer entry is non-zero then
+                 * this buffer has not been used. (The 16C32 clears the count
+                 * field when it starts using the buffer.) If an unused buffer
+                 * is encountered then there are no frames available.
+                 */
+
+                if ( info->rx_buffer_list[EndIndex].count )
+                        goto Cleanup;
+
+                /* advance to next buffer entry in linked list */
+                EndIndex++;
+                if ( EndIndex == info->rx_buffer_count )
+                        EndIndex = 0;
+
+                /* if entire list searched then no frame available */
+                if ( EndIndex == StartIndex ) {
+                        /* If this occurs then something bad happened,
+                         * all buffers have been 'used' but none mark
+                         * the end of a frame. Reset buffers and receiver.
+                         */
+
+                        if ( info->rx_enabled ){
+                                spin_lock_irqsave(&info->irq_spinlock,flags);
+                                usc_start_receiver(info);
+                                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                        }
+                        goto Cleanup;
+                }
+        }
+
+
+        /* check status of receive frame */
+        
+        status = info->rx_buffer_list[EndIndex].status;
+
+        if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
+                        RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
+                if ( status & RXSTATUS_SHORT_FRAME )
+                        info->icount.rxshort++;
+                else if ( status & RXSTATUS_ABORT )
+                        info->icount.rxabort++;
+                else if ( status & RXSTATUS_OVERRUN )
+                        info->icount.rxover++;
+                else {
+                        info->icount.rxcrc++;
+                        if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
+                                return_frame = true;
+                }
+                framesize = 0;
+#if SYNCLINK_GENERIC_HDLC
+                {
+                        info->netdev->stats.rx_errors++;
+                        info->netdev->stats.rx_frame_errors++;
+                }
+#endif
+        } else
+                return_frame = true;
+
+        if ( return_frame ) {
+                /* receive frame has no errors, get frame size.
+                 * The frame size is the starting value of the RCC (which was
+                 * set to 0xffff) minus the ending value of the RCC (decremented
+                 * once for each receive character) minus 2 for the 16-bit CRC.
+                 */
+
+                framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
+
+                /* adjust frame size for CRC if any */
+                if ( info->params.crc_type == HDLC_CRC_16_CCITT )
+                        framesize -= 2;
+                else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
+                        framesize -= 4;         
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
+                        __FILE__,__LINE__,info->device_name,status,framesize);
+                        
+        if ( debug_level >= DEBUG_LEVEL_DATA )
+                mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
+                        min_t(int, framesize, DMABUFFERSIZE),0);
+                
+        if (framesize) {
+                if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
+                                ((framesize+1) > info->max_frame_size) ) ||
+                        (framesize > info->max_frame_size) )
+                        info->icount.rxlong++;
+                else {
+                        /* copy dma buffer(s) to contiguous intermediate buffer */
+                        int copy_count = framesize;
+                        int index = StartIndex;
+                        unsigned char *ptmp = info->intermediate_rxbuffer;
+
+                        if ( !(status & RXSTATUS_CRC_ERROR))
+                        info->icount.rxok++;
+                        
+                        while(copy_count) {
+                                int partial_count;
+                                if ( copy_count > DMABUFFERSIZE )
+                                        partial_count = DMABUFFERSIZE;
+                                else
+                                        partial_count = copy_count;
+                        
+                                pBufEntry = &(info->rx_buffer_list[index]);
+                                memcpy( ptmp, pBufEntry->virt_addr, partial_count );
+                                ptmp += partial_count;
+                                copy_count -= partial_count;
+                                
+                                if ( ++index == info->rx_buffer_count )
+                                        index = 0;
+                        }
+
+                        if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
+                                ++framesize;
+                                *ptmp = (status & RXSTATUS_CRC_ERROR ?
+                                                RX_CRC_ERROR :
+                                                RX_OK);
+
+                                if ( debug_level >= DEBUG_LEVEL_DATA )
+                                        printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
+                                                __FILE__,__LINE__,info->device_name,
+                                                *ptmp);
+                        }
+
+#if SYNCLINK_GENERIC_HDLC
+                        if (info->netcount)
+                                hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
+                        else
+#endif
+                                ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
+                }
+        }
+        /* Free the buffers used by this frame. */
+        mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
+
+        ReturnCode = true;
+
+Cleanup:
+
+        if ( info->rx_enabled && info->rx_overflow ) {
+                /* The receiver needs to restarted because of 
+                 * a receive overflow (buffer or FIFO). If the 
+                 * receive buffers are now empty, then restart receiver.
+                 */
+
+                if ( !info->rx_buffer_list[EndIndex].status &&
+                        info->rx_buffer_list[EndIndex].count ) {
+                        spin_lock_irqsave(&info->irq_spinlock,flags);
+                        usc_start_receiver(info);
+                        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                }
+        }
+
+        return ReturnCode;
+
+}       /* end of mgsl_get_rx_frame() */
+
+/* mgsl_get_raw_rx_frame()
+ *
+ *      This function attempts to return a received frame from the
+ *      receive DMA buffers when running in external loop mode. In this mode,
+ *      we will return at most one DMABUFFERSIZE frame to the application.
+ *      The USC receiver is triggering off of DCD going active to start a new
+ *      frame, and DCD going inactive to terminate the frame (similar to
+ *      processing a closing flag character).
+ *
+ *      In this routine, we will return DMABUFFERSIZE "chunks" at a time.
+ *      If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
+ *      status field and the RCC field will indicate the length of the
+ *      entire received frame. We take this RCC field and get the modulus
+ *      of RCC and DMABUFFERSIZE to determine if number of bytes in the
+ *      last Rx DMA buffer and return that last portion of the frame.
+ *
+ * Arguments:           info    pointer to device extension
+ * Return Value:        true if frame returned, otherwise false
+ */
+static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
+{
+        unsigned int CurrentIndex, NextIndex;
+        unsigned short status;
+        DMABUFFERENTRY *pBufEntry;
+        unsigned int framesize = 0;
+        bool ReturnCode = false;
+        unsigned long flags;
+        struct tty_struct *tty = info->port.tty;
+
+        /*
+         * current_rx_buffer points to the 1st buffer of the next available
+         * receive frame. The status field is set by the 16C32 after
+         * completing a receive frame. If the status field of this buffer
+         * is zero, either the USC is still filling this buffer or this
+         * is one of a series of buffers making up a received frame.
+         *
+         * If the count field of this buffer is zero, the USC is either
+         * using this buffer or has used this buffer. Look at the count
+         * field of the next buffer. If that next buffer's count is
+         * non-zero, the USC is still actively using the current buffer.
+         * Otherwise, if the next buffer's count field is zero, the
+         * current buffer is complete and the USC is using the next
+         * buffer.
+         */
+        CurrentIndex = NextIndex = info->current_rx_buffer;
+        ++NextIndex;
+        if ( NextIndex == info->rx_buffer_count )
+                NextIndex = 0;
+
+        if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
+                (info->rx_buffer_list[CurrentIndex].count == 0 &&
+                        info->rx_buffer_list[NextIndex].count == 0)) {
+                /*
+                 * Either the status field of this dma buffer is non-zero
+                 * (indicating the last buffer of a receive frame) or the next
+                 * buffer is marked as in use -- implying this buffer is complete
+                 * and an intermediate buffer for this received frame.
+                 */
+
+                status = info->rx_buffer_list[CurrentIndex].status;
+
+                if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
+                                RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
+                        if ( status & RXSTATUS_SHORT_FRAME )
+                                info->icount.rxshort++;
+                        else if ( status & RXSTATUS_ABORT )
+                                info->icount.rxabort++;
+                        else if ( status & RXSTATUS_OVERRUN )
+                                info->icount.rxover++;
+                        else
+                                info->icount.rxcrc++;
+                        framesize = 0;
+                } else {
+                        /*
+                         * A receive frame is available, get frame size and status.
+                         *
+                         * The frame size is the starting value of the RCC (which was
+                         * set to 0xffff) minus the ending value of the RCC (decremented
+                         * once for each receive character) minus 2 or 4 for the 16-bit
+                         * or 32-bit CRC.
+                         *
+                         * If the status field is zero, this is an intermediate buffer.
+                         * It's size is 4K.
+                         *
+                         * If the DMA Buffer Entry's Status field is non-zero, the
+                         * receive operation completed normally (ie: DCD dropped). The
+                         * RCC field is valid and holds the received frame size.
+                         * It is possible that the RCC field will be zero on a DMA buffer
+                         * entry with a non-zero status. This can occur if the total
+                         * frame size (number of bytes between the time DCD goes active
+                         * to the time DCD goes inactive) exceeds 65535 bytes. In this
+                         * case the 16C32 has underrun on the RCC count and appears to
+                         * stop updating this counter to let us know the actual received
+                         * frame size. If this happens (non-zero status and zero RCC),
+                         * simply return the entire RxDMA Buffer
+                         */
+                        if ( status ) {
+                                /*
+                                 * In the event that the final RxDMA Buffer is
+                                 * terminated with a non-zero status and the RCC
+                                 * field is zero, we interpret this as the RCC
+                                 * having underflowed (received frame > 65535 bytes).
+                                 *
+                                 * Signal the event to the user by passing back
+                                 * a status of RxStatus_CrcError returning the full
+                                 * buffer and let the app figure out what data is
+                                 * actually valid
+                                 */
+                                if ( info->rx_buffer_list[CurrentIndex].rcc )
+                                        framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
+                                else
+                                        framesize = DMABUFFERSIZE;
+                        }
+                        else
+                                framesize = DMABUFFERSIZE;
+                }
+
+                if ( framesize > DMABUFFERSIZE ) {
+                        /*
+                         * if running in raw sync mode, ISR handler for
+                         * End Of Buffer events terminates all buffers at 4K.
+                         * If this frame size is said to be >4K, get the
+                         * actual number of bytes of the frame in this buffer.
+                         */
+                        framesize = framesize % DMABUFFERSIZE;
+                }
+
+
+                if ( debug_level >= DEBUG_LEVEL_BH )
+                        printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
+                                __FILE__,__LINE__,info->device_name,status,framesize);
+
+                if ( debug_level >= DEBUG_LEVEL_DATA )
+                        mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
+                                min_t(int, framesize, DMABUFFERSIZE),0);
+
+                if (framesize) {
+                        /* copy dma buffer(s) to contiguous intermediate buffer */
+                        /* NOTE: we never copy more than DMABUFFERSIZE bytes    */
+
+                        pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
+                        memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
+                        info->icount.rxok++;
+
+                        ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
+                }
+
+                /* Free the buffers used by this frame. */
+                mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
+
+                ReturnCode = true;
+        }
+
+
+        if ( info->rx_enabled && info->rx_overflow ) {
+                /* The receiver needs to restarted because of
+                 * a receive overflow (buffer or FIFO). If the
+                 * receive buffers are now empty, then restart receiver.
+                 */
+
+                if ( !info->rx_buffer_list[CurrentIndex].status &&
+                        info->rx_buffer_list[CurrentIndex].count ) {
+                        spin_lock_irqsave(&info->irq_spinlock,flags);
+                        usc_start_receiver(info);
+                        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                }
+        }
+
+        return ReturnCode;
+
+}       /* end of mgsl_get_raw_rx_frame() */
+
+/* mgsl_load_tx_dma_buffer()
+ * 
+ *      Load the transmit DMA buffer with the specified data.
+ * 
+ * Arguments:
+ * 
+ *      info            pointer to device extension
+ *      Buffer          pointer to buffer containing frame to load
+ *      BufferSize      size in bytes of frame in Buffer
+ * 
+ * Return Value:        None
+ */
+static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
+                const char *Buffer, unsigned int BufferSize)
+{
+        unsigned short Copycount;
+        unsigned int i = 0;
+        DMABUFFERENTRY *pBufEntry;
+        
+        if ( debug_level >= DEBUG_LEVEL_DATA )
+                mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
+
+        if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
+                /* set CMR:13 to start transmit when
+                 * next GoAhead (abort) is received
+                 */
+                info->cmr_value |= BIT13;                         
+        }
+                
+        /* begin loading the frame in the next available tx dma
+         * buffer, remember it's starting location for setting
+         * up tx dma operation
+         */
+        i = info->current_tx_buffer;
+        info->start_tx_dma_buffer = i;
+
+        /* Setup the status and RCC (Frame Size) fields of the 1st */
+        /* buffer entry in the transmit DMA buffer list. */
+
+        info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
+        info->tx_buffer_list[i].rcc    = BufferSize;
+        info->tx_buffer_list[i].count  = BufferSize;
+
+        /* Copy frame data from 1st source buffer to the DMA buffers. */
+        /* The frame data may span multiple DMA buffers. */
+
+        while( BufferSize ){
+                /* Get a pointer to next DMA buffer entry. */
+                pBufEntry = &info->tx_buffer_list[i++];
+                        
+                if ( i == info->tx_buffer_count )
+                        i=0;
+
+                /* Calculate the number of bytes that can be copied from */
+                /* the source buffer to this DMA buffer. */
+                if ( BufferSize > DMABUFFERSIZE )
+                        Copycount = DMABUFFERSIZE;
+                else
+                        Copycount = BufferSize;
+
+                /* Actually copy data from source buffer to DMA buffer. */
+                /* Also set the data count for this individual DMA buffer. */
+                if ( info->bus_type == MGSL_BUS_TYPE_PCI )
+                        mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
+                else
+                        memcpy(pBufEntry->virt_addr, Buffer, Copycount);
+
+                pBufEntry->count = Copycount;
+
+                /* Advance source pointer and reduce remaining data count. */
+                Buffer += Copycount;
+                BufferSize -= Copycount;
+
+                ++info->tx_dma_buffers_used;
+        }
+
+        /* remember next available tx dma buffer */
+        info->current_tx_buffer = i;
+
+}       /* end of mgsl_load_tx_dma_buffer() */
+
+/*
+ * mgsl_register_test()
+ * 
+ *      Performs a register test of the 16C32.
+ *      
+ * Arguments:           info    pointer to device instance data
+ * Return Value:                true if test passed, otherwise false
+ */
+static bool mgsl_register_test( struct mgsl_struct *info )
+{
+        static unsigned short BitPatterns[] =
+                { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
+        static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
+        unsigned int i;
+        bool rc = true;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_reset(info);
+
+        /* Verify the reset state of some registers. */
+
+        if ( (usc_InReg( info, SICR ) != 0) ||
+                  (usc_InReg( info, IVR  ) != 0) ||
+                  (usc_InDmaReg( info, DIVR ) != 0) ){
+                rc = false;
+        }
+
+        if ( rc ){
+                /* Write bit patterns to various registers but do it out of */
+                /* sync, then read back and verify values. */
+
+                for ( i = 0 ; i < Patterncount ; i++ ) {
+                        usc_OutReg( info, TC0R, BitPatterns[i] );
+                        usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
+                        usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
+                        usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
+                        usc_OutReg( info, RSR,  BitPatterns[(i+4)%Patterncount] );
+                        usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
+
+                        if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
+                                  (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
+                                  (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
+                                  (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
+                                  (usc_InReg( info, RSR )  != BitPatterns[(i+4)%Patterncount]) ||
+                                  (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
+                                rc = false;
+                                break;
+                        }
+                }
+        }
+
+        usc_reset(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        return rc;
+
+}       /* end of mgsl_register_test() */
+
+/* mgsl_irq_test()      Perform interrupt test of the 16C32.
+ * 
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        true if test passed, otherwise false
+ */
+static bool mgsl_irq_test( struct mgsl_struct *info )
+{
+        unsigned long EndTime;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_reset(info);
+
+        /*
+         * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition. 
+         * The ISR sets irq_occurred to true.
+         */
+
+        info->irq_occurred = false;
+
+        /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
+        /* Enable INTEN (Port 6, Bit12) */
+        /* This connects the IRQ request signal to the ISA bus */
+        /* on the ISA adapter. This has no effect for the PCI adapter */
+        usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
+
+        usc_EnableMasterIrqBit(info);
+        usc_EnableInterrupts(info, IO_PIN);
+        usc_ClearIrqPendingBits(info, IO_PIN);
+        
+        usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
+        usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
+
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        EndTime=100;
+        while( EndTime-- && !info->irq_occurred ) {
+                msleep_interruptible(10);
+        }
+        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_reset(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+        return info->irq_occurred;
+
+}       /* end of mgsl_irq_test() */
+
+/* mgsl_dma_test()
+ * 
+ *      Perform a DMA test of the 16C32. A small frame is
+ *      transmitted via DMA from a transmit buffer to a receive buffer
+ *      using single buffer DMA mode.
+ *      
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        true if test passed, otherwise false
+ */
+static bool mgsl_dma_test( struct mgsl_struct *info )
+{
+        unsigned short FifoLevel;
+        unsigned long phys_addr;
+        unsigned int FrameSize;
+        unsigned int i;
+        char *TmpPtr;
+        bool rc = true;
+        unsigned short status=0;
+        unsigned long EndTime;
+        unsigned long flags;
+        MGSL_PARAMS tmp_params;
+
+        /* save current port options */
+        memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
+        /* load default port options */
+        memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
+        
+#define TESTFRAMESIZE 40
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        
+        /* setup 16C32 for SDLC DMA transfer mode */
+
+        usc_reset(info);
+        usc_set_sdlc_mode(info);
+        usc_enable_loopback(info,1);
+        
+        /* Reprogram the RDMR so that the 16C32 does NOT clear the count
+         * field of the buffer entry after fetching buffer address. This
+         * way we can detect a DMA failure for a DMA read (which should be
+         * non-destructive to system memory) before we try and write to
+         * memory (where a failure could corrupt system memory).
+         */
+
+        /* Receive DMA mode Register (RDMR)
+         * 
+         * <15..14>     11      DMA mode = Linked List Buffer mode
+         * <13>         1       RSBinA/L = store Rx status Block in List entry
+         * <12>         0       1 = Clear count of List Entry after fetching
+         * <11..10>     00      Address mode = Increment
+         * <9>          1       Terminate Buffer on RxBound
+         * <8>          0       Bus Width = 16bits
+         * <7..0>               ?       status Bits (write as 0s)
+         * 
+         * 1110 0010 0000 0000 = 0xe200
+         */
+
+        usc_OutDmaReg( info, RDMR, 0xe200 );
+        
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+
+        /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
+
+        FrameSize = TESTFRAMESIZE;
+
+        /* setup 1st transmit buffer entry: */
+        /* with frame size and transmit control word */
+
+        info->tx_buffer_list[0].count  = FrameSize;
+        info->tx_buffer_list[0].rcc    = FrameSize;
+        info->tx_buffer_list[0].status = 0x4000;
+
+        /* build a transmit frame in 1st transmit DMA buffer */
+
+        TmpPtr = info->tx_buffer_list[0].virt_addr;
+        for (i = 0; i < FrameSize; i++ )
+                *TmpPtr++ = i;
+
+        /* setup 1st receive buffer entry: */
+        /* clear status, set max receive buffer size */
+
+        info->rx_buffer_list[0].status = 0;
+        info->rx_buffer_list[0].count = FrameSize + 4;
+
+        /* zero out the 1st receive buffer */
+
+        memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
+
+        /* Set count field of next buffer entries to prevent */
+        /* 16C32 from using buffers after the 1st one. */
+
+        info->tx_buffer_list[1].count = 0;
+        info->rx_buffer_list[1].count = 0;
+        
+
+        /***************************/
+        /* Program 16C32 receiver. */
+        /***************************/
+        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+
+        /* setup DMA transfers */
+        usc_RTCmd( info, RTCmd_PurgeRxFifo );
+
+        /* program 16C32 receiver with physical address of 1st DMA buffer entry */
+        phys_addr = info->rx_buffer_list[0].phys_entry;
+        usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
+        usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
+
+        /* Clear the Rx DMA status bits (read RDMR) and start channel */
+        usc_InDmaReg( info, RDMR );
+        usc_DmaCmd( info, DmaCmd_InitRxChannel );
+
+        /* Enable Receiver (RMR <1..0> = 10) */
+        usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
+        
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+
+        /*************************************************************/
+        /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
+        /*************************************************************/
+
+        /* Wait 100ms for interrupt. */
+        EndTime = jiffies + msecs_to_jiffies(100);
+
+        for(;;) {
+                if (time_after(jiffies, EndTime)) {
+                        rc = false;
+                        break;
+                }
+
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                status = usc_InDmaReg( info, RDMR );
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+                if ( !(status & BIT4) && (status & BIT5) ) {
+                        /* INITG (BIT 4) is inactive (no entry read in progress) AND */
+                        /* BUSY  (BIT 5) is active (channel still active). */
+                        /* This means the buffer entry read has completed. */
+                        break;
+                }
+        }
+
+
+        /******************************/
+        /* Program 16C32 transmitter. */
+        /******************************/
+        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+
+        /* Program the Transmit Character Length Register (TCLR) */
+        /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
+
+        usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
+        usc_RTCmd( info, RTCmd_PurgeTxFifo );
+
+        /* Program the address of the 1st DMA Buffer Entry in linked list */
+
+        phys_addr = info->tx_buffer_list[0].phys_entry;
+        usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
+        usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
+
+        /* unlatch Tx status bits, and start transmit channel. */
+
+        usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
+        usc_DmaCmd( info, DmaCmd_InitTxChannel );
+
+        /* wait for DMA controller to fill transmit FIFO */
+
+        usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
+        
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+
+        /**********************************/
+        /* WAIT FOR TRANSMIT FIFO TO FILL */
+        /**********************************/
+        
+        /* Wait 100ms */
+        EndTime = jiffies + msecs_to_jiffies(100);
+
+        for(;;) {
+                if (time_after(jiffies, EndTime)) {
+                        rc = false;
+                        break;
+                }
+
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                FifoLevel = usc_InReg(info, TICR) >> 8;
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                        
+                if ( FifoLevel < 16 )
+                        break;
+                else
+                        if ( FrameSize < 32 ) {
+                                /* This frame is smaller than the entire transmit FIFO */
+                                /* so wait for the entire frame to be loaded. */
+                                if ( FifoLevel <= (32 - FrameSize) )
+                                        break;
+                        }
+        }
+
+
+        if ( rc )
+        {
+                /* Enable 16C32 transmitter. */
+
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                
+                /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
+                usc_TCmd( info, TCmd_SendFrame );
+                usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
+                
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+                                                
+                /******************************/
+                /* WAIT FOR TRANSMIT COMPLETE */
+                /******************************/
+
+                /* Wait 100ms */
+                EndTime = jiffies + msecs_to_jiffies(100);
+
+                /* While timer not expired wait for transmit complete */
+
+                spin_lock_irqsave(&info->irq_spinlock,flags);
+                status = usc_InReg( info, TCSR );
+                spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+                while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
+                        if (time_after(jiffies, EndTime)) {
+                                rc = false;
+                                break;
+                        }
+
+                        spin_lock_irqsave(&info->irq_spinlock,flags);
+                        status = usc_InReg( info, TCSR );
+                        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+                }
+        }
+
+
+        if ( rc ){
+                /* CHECK FOR TRANSMIT ERRORS */
+                if ( status & (BIT5 + BIT1) ) 
+                        rc = false;
+        }
+
+        if ( rc ) {
+                /* WAIT FOR RECEIVE COMPLETE */
+
+                /* Wait 100ms */
+                EndTime = jiffies + msecs_to_jiffies(100);
+
+                /* Wait for 16C32 to write receive status to buffer entry. */
+                status=info->rx_buffer_list[0].status;
+                while ( status == 0 ) {
+                        if (time_after(jiffies, EndTime)) {
+                                rc = false;
+                                break;
+                        }
+                        status=info->rx_buffer_list[0].status;
+                }
+        }
+
+
+        if ( rc ) {
+                /* CHECK FOR RECEIVE ERRORS */
+                status = info->rx_buffer_list[0].status;
+
+                if ( status & (BIT8 + BIT3 + BIT1) ) {
+                        /* receive error has occurred */
+                        rc = false;
+                } else {
+                        if ( memcmp( info->tx_buffer_list[0].virt_addr ,
+                                info->rx_buffer_list[0].virt_addr, FrameSize ) ){
+                                rc = false;
+                        }
+                }
+        }
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_reset( info );
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        /* restore current port options */
+        memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
+        
+        return rc;
+
+}       /* end of mgsl_dma_test() */
+
+/* mgsl_adapter_test()
+ * 
+ *      Perform the register, IRQ, and DMA tests for the 16C32.
+ *      
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        0 if success, otherwise -ENODEV
+ */
+static int mgsl_adapter_test( struct mgsl_struct *info )
+{
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):Testing device %s\n",
+                        __FILE__,__LINE__,info->device_name );
+                        
+        if ( !mgsl_register_test( info ) ) {
+                info->init_error = DiagStatus_AddressFailure;
+                printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
+                        __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
+                return -ENODEV;
+        }
+
+        if ( !mgsl_irq_test( info ) ) {
+                info->init_error = DiagStatus_IrqFailure;
+                printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
+                        __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
+                return -ENODEV;
+        }
+
+        if ( !mgsl_dma_test( info ) ) {
+                info->init_error = DiagStatus_DmaFailure;
+                printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
+                        __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
+                return -ENODEV;
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):device %s passed diagnostics\n",
+                        __FILE__,__LINE__,info->device_name );
+                        
+        return 0;
+
+}       /* end of mgsl_adapter_test() */
+
+/* mgsl_memory_test()
+ * 
+ *      Test the shared memory on a PCI adapter.
+ * 
+ * Arguments:           info    pointer to device instance data
+ * Return Value:        true if test passed, otherwise false
+ */
+static bool mgsl_memory_test( struct mgsl_struct *info )
+{
+        static unsigned long BitPatterns[] =
+                { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
+        unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
+        unsigned long i;
+        unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
+        unsigned long * TestAddr;
+
+        if ( info->bus_type != MGSL_BUS_TYPE_PCI )
+                return true;
+
+        TestAddr = (unsigned long *)info->memory_base;
+
+        /* Test data lines with test pattern at one location. */
+
+        for ( i = 0 ; i < Patterncount ; i++ ) {
+                *TestAddr = BitPatterns[i];
+                if ( *TestAddr != BitPatterns[i] )
+                        return false;
+        }
+
+        /* Test address lines with incrementing pattern over */
+        /* entire address range. */
+
+        for ( i = 0 ; i < TestLimit ; i++ ) {
+                *TestAddr = i * 4;
+                TestAddr++;
+        }
+
+        TestAddr = (unsigned long *)info->memory_base;
+
+        for ( i = 0 ; i < TestLimit ; i++ ) {
+                if ( *TestAddr != i * 4 )
+                        return false;
+                TestAddr++;
+        }
+
+        memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
+
+        return true;
+
+}       /* End Of mgsl_memory_test() */
+
+
+/* mgsl_load_pci_memory()
+ * 
+ *      Load a large block of data into the PCI shared memory.
+ *      Use this instead of memcpy() or memmove() to move data
+ *      into the PCI shared memory.
+ * 
+ * Notes:
+ * 
+ *      This function prevents the PCI9050 interface chip from hogging
+ *      the adapter local bus, which can starve the 16C32 by preventing
+ *      16C32 bus master cycles.
+ * 
+ *      The PCI9050 documentation says that the 9050 will always release
+ *      control of the local bus after completing the current read
+ *      or write operation.
+ * 
+ *      It appears that as long as the PCI9050 write FIFO is full, the
+ *      PCI9050 treats all of the writes as a single burst transaction
+ *      and will not release the bus. This causes DMA latency problems
+ *      at high speeds when copying large data blocks to the shared
+ *      memory.
+ * 
+ *      This function in effect, breaks the a large shared memory write
+ *      into multiple transations by interleaving a shared memory read
+ *      which will flush the write FIFO and 'complete' the write
+ *      transation. This allows any pending DMA request to gain control
+ *      of the local bus in a timely fasion.
+ * 
+ * Arguments:
+ * 
+ *      TargetPtr       pointer to target address in PCI shared memory
+ *      SourcePtr       pointer to source buffer for data
+ *      count           count in bytes of data to copy
+ *
+ * Return Value:        None
+ */
+static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
+        unsigned short count )
+{
+        /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
+#define PCI_LOAD_INTERVAL 64
+
+        unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
+        unsigned short Index;
+        unsigned long Dummy;
+
+        for ( Index = 0 ; Index < Intervalcount ; Index++ )
+        {
+                memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
+                Dummy = *((volatile unsigned long *)TargetPtr);
+                TargetPtr += PCI_LOAD_INTERVAL;
+                SourcePtr += PCI_LOAD_INTERVAL;
+        }
+
+        memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
+
+}       /* End Of mgsl_load_pci_memory() */
+
+static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
+{
+        int i;
+        int linecount;
+        if (xmit)
+                printk("%s tx data:\n",info->device_name);
+        else
+                printk("%s rx data:\n",info->device_name);
+                
+        while(count) {
+                if (count > 16)
+                        linecount = 16;
+                else
+                        linecount = count;
+                        
+                for(i=0;i<linecount;i++)
+                        printk("%02X ",(unsigned char)data[i]);
+                for(;i<17;i++)
+                        printk("   ");
+                for(i=0;i<linecount;i++) {
+                        if (data[i]>=040 && data[i]<=0176)
+                                printk("%c",data[i]);
+                        else
+                                printk(".");
+                }
+                printk("\n");
+                
+                data  += linecount;
+                count -= linecount;
+        }
+}       /* end of mgsl_trace_block() */
+
+/* mgsl_tx_timeout()
+ * 
+ *      called when HDLC frame times out
+ *      update stats and do tx completion processing
+ *      
+ * Arguments:   context         pointer to device instance data
+ * Return Value:        None
+ */
+static void mgsl_tx_timeout(unsigned long context)
+{
+        struct mgsl_struct *info = (struct mgsl_struct*)context;
+        unsigned long flags;
+        
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):mgsl_tx_timeout(%s)\n",
+                        __FILE__,__LINE__,info->device_name);
+        if(info->tx_active &&
+           (info->params.mode == MGSL_MODE_HDLC ||
+            info->params.mode == MGSL_MODE_RAW) ) {
+                info->icount.txtimeout++;
+        }
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        info->tx_active = false;
+        info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+        if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
+                usc_loopmode_cancel_transmit( info );
+
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+        
+#if SYNCLINK_GENERIC_HDLC
+        if (info->netcount)
+                hdlcdev_tx_done(info);
+        else
+#endif
+                mgsl_bh_transmit(info);
+        
+}       /* end of mgsl_tx_timeout() */
+
+/* signal that there are no more frames to send, so that
+ * line is 'released' by echoing RxD to TxD when current
+ * transmission is complete (or immediately if no tx in progress).
+ */
+static int mgsl_loopmode_send_done( struct mgsl_struct * info )
+{
+        unsigned long flags;
+        
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
+                if (info->tx_active)
+                        info->loopmode_send_done_requested = true;
+                else
+                        usc_loopmode_send_done(info);
+        }
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        return 0;
+}
+
+/* release the line by echoing RxD to TxD
+ * upon completion of a transmit frame
+ */
+static void usc_loopmode_send_done( struct mgsl_struct * info )
+{
+        info->loopmode_send_done_requested = false;
+        /* clear CMR:13 to 0 to start echoing RxData to TxData */
+        info->cmr_value &= ~BIT13;                        
+        usc_OutReg(info, CMR, info->cmr_value);
+}
+
+/* abort a transmit in progress while in HDLC LoopMode
+ */
+static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
+{
+        /* reset tx dma channel and purge TxFifo */
+        usc_RTCmd( info, RTCmd_PurgeTxFifo );
+        usc_DmaCmd( info, DmaCmd_ResetTxChannel );
+        usc_loopmode_send_done( info );
+}
+
+/* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
+ * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
+ * we must clear CMR:13 to begin repeating TxData to RxData
+ */
+static void usc_loopmode_insert_request( struct mgsl_struct * info )
+{
+        info->loopmode_insert_requested = true;
+ 
+        /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
+         * begin repeating TxData on RxData (complete insertion)
+         */
+        usc_OutReg( info, RICR, 
+                (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
+                
+        /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
+        info->cmr_value |= BIT13;
+        usc_OutReg(info, CMR, info->cmr_value);
+}
+
+/* return 1 if station is inserted into the loop, otherwise 0
+ */
+static int usc_loopmode_active( struct mgsl_struct * info)
+{
+        return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
+}
+
+#if SYNCLINK_GENERIC_HDLC
+
+/**
+ * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
+ * set encoding and frame check sequence (FCS) options
+ *
+ * dev       pointer to network device structure
+ * encoding  serial encoding setting
+ * parity    FCS setting
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
+                          unsigned short parity)
+{
+        struct mgsl_struct *info = dev_to_port(dev);
+        unsigned char  new_encoding;
+        unsigned short new_crctype;
+
+        /* return error if TTY interface open */
+        if (info->port.count)
+                return -EBUSY;
+
+        switch (encoding)
+        {
+        case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
+        case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
+        case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
+        case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
+        case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
+        default: return -EINVAL;
+        }
+
+        switch (parity)
+        {
+        case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
+        case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
+        case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
+        default: return -EINVAL;
+        }
+
+        info->params.encoding = new_encoding;
+        info->params.crc_type = new_crctype;
+
+        /* if network interface up, reprogram hardware */
+        if (info->netcount)
+                mgsl_program_hw(info);
+
+        return 0;
+}
+
+/**
+ * called by generic HDLC layer to send frame
+ *
+ * skb  socket buffer containing HDLC frame
+ * dev  pointer to network device structure
+ */
+static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
+                                      struct net_device *dev)
+{
+        struct mgsl_struct *info = dev_to_port(dev);
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
+
+        /* stop sending until this frame completes */
+        netif_stop_queue(dev);
+
+        /* copy data to device buffers */
+        info->xmit_cnt = skb->len;
+        mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
+
+        /* update network statistics */
+        dev->stats.tx_packets++;
+        dev->stats.tx_bytes += skb->len;
+
+        /* done with socket buffer, so free it */
+        dev_kfree_skb(skb);
+
+        /* save start time for transmit timeout detection */
+        dev->trans_start = jiffies;
+
+        /* start hardware transmitter if necessary */
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        if (!info->tx_active)
+                usc_start_transmitter(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        return NETDEV_TX_OK;
+}
+
+/**
+ * called by network layer when interface enabled
+ * claim resources and initialize hardware
+ *
+ * dev  pointer to network device structure
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_open(struct net_device *dev)
+{
+        struct mgsl_struct *info = dev_to_port(dev);
+        int rc;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
+
+        /* generic HDLC layer open processing */
+        if ((rc = hdlc_open(dev)))
+                return rc;
+
+        /* arbitrate between network and tty opens */
+        spin_lock_irqsave(&info->netlock, flags);
+        if (info->port.count != 0 || info->netcount != 0) {
+                printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
+                spin_unlock_irqrestore(&info->netlock, flags);
+                return -EBUSY;
+        }
+        info->netcount=1;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        /* claim resources and init adapter */
+        if ((rc = startup(info)) != 0) {
+                spin_lock_irqsave(&info->netlock, flags);
+                info->netcount=0;
+                spin_unlock_irqrestore(&info->netlock, flags);
+                return rc;
+        }
+
+        /* assert DTR and RTS, apply hardware settings */
+        info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        mgsl_program_hw(info);
+
+        /* enable network layer transmit */
+        dev->trans_start = jiffies;
+        netif_start_queue(dev);
+
+        /* inform generic HDLC layer of current DCD status */
+        spin_lock_irqsave(&info->irq_spinlock, flags);
+        usc_get_serial_signals(info);
+        spin_unlock_irqrestore(&info->irq_spinlock, flags);
+        if (info->serial_signals & SerialSignal_DCD)
+                netif_carrier_on(dev);
+        else
+                netif_carrier_off(dev);
+        return 0;
+}
+
+/**
+ * called by network layer when interface is disabled
+ * shutdown hardware and release resources
+ *
+ * dev  pointer to network device structure
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_close(struct net_device *dev)
+{
+        struct mgsl_struct *info = dev_to_port(dev);
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
+
+        netif_stop_queue(dev);
+
+        /* shutdown adapter and release resources */
+        shutdown(info);
+
+        hdlc_close(dev);
+
+        spin_lock_irqsave(&info->netlock, flags);
+        info->netcount=0;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        return 0;
+}
+
+/**
+ * called by network layer to process IOCTL call to network device
+ *
+ * dev  pointer to network device structure
+ * ifr  pointer to network interface request structure
+ * cmd  IOCTL command code
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+        const size_t size = sizeof(sync_serial_settings);
+        sync_serial_settings new_line;
+        sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
+        struct mgsl_struct *info = dev_to_port(dev);
+        unsigned int flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
+
+        /* return error if TTY interface open */
+        if (info->port.count)
+                return -EBUSY;
+
+        if (cmd != SIOCWANDEV)
+                return hdlc_ioctl(dev, ifr, cmd);
+
+        switch(ifr->ifr_settings.type) {
+        case IF_GET_IFACE: /* return current sync_serial_settings */
+
+                ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
+                if (ifr->ifr_settings.size < size) {
+                        ifr->ifr_settings.size = size; /* data size wanted */
+                        return -ENOBUFS;
+                }
+
+                flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                              HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                              HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                              HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
+
+                switch (flags){
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
+                case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
+                default: new_line.clock_type = CLOCK_DEFAULT;
+                }
+
+                new_line.clock_rate = info->params.clock_speed;
+                new_line.loopback   = info->params.loopback ? 1:0;
+
+                if (copy_to_user(line, &new_line, size))
+                        return -EFAULT;
+                return 0;
+
+        case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
+
+                if(!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                if (copy_from_user(&new_line, line, size))
+                        return -EFAULT;
+
+                switch (new_line.clock_type)
+                {
+                case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
+                case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
+                case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
+                case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
+                case CLOCK_DEFAULT:  flags = info->params.flags &
+                                             (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                              HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                              HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                              HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
+                default: return -EINVAL;
+                }
+
+                if (new_line.loopback != 0 && new_line.loopback != 1)
+                        return -EINVAL;
+
+                info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                        HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                        HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                        HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
+                info->params.flags |= flags;
+
+                info->params.loopback = new_line.loopback;
+
+                if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
+                        info->params.clock_speed = new_line.clock_rate;
+                else
+                        info->params.clock_speed = 0;
+
+                /* if network interface up, reprogram hardware */
+                if (info->netcount)
+                        mgsl_program_hw(info);
+                return 0;
+
+        default:
+                return hdlc_ioctl(dev, ifr, cmd);
+        }
+}
+
+/**
+ * called by network layer when transmit timeout is detected
+ *
+ * dev  pointer to network device structure
+ */
+static void hdlcdev_tx_timeout(struct net_device *dev)
+{
+        struct mgsl_struct *info = dev_to_port(dev);
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("hdlcdev_tx_timeout(%s)\n",dev->name);
+
+        dev->stats.tx_errors++;
+        dev->stats.tx_aborted_errors++;
+
+        spin_lock_irqsave(&info->irq_spinlock,flags);
+        usc_stop_transmitter(info);
+        spin_unlock_irqrestore(&info->irq_spinlock,flags);
+
+        netif_wake_queue(dev);
+}
+
+/**
+ * called by device driver when transmit completes
+ * reenable network layer transmit if stopped
+ *
+ * info  pointer to device instance information
+ */
+static void hdlcdev_tx_done(struct mgsl_struct *info)
+{
+        if (netif_queue_stopped(info->netdev))
+                netif_wake_queue(info->netdev);
+}
+
+/**
+ * called by device driver when frame received
+ * pass frame to network layer
+ *
+ * info  pointer to device instance information
+ * buf   pointer to buffer contianing frame data
+ * size  count of data bytes in buf
+ */
+static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
+{
+        struct sk_buff *skb = dev_alloc_skb(size);
+        struct net_device *dev = info->netdev;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("hdlcdev_rx(%s)\n", dev->name);
+
+        if (skb == NULL) {
+                printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
+                       dev->name);
+                dev->stats.rx_dropped++;
+                return;
+        }
+
+        memcpy(skb_put(skb, size), buf, size);
+
+        skb->protocol = hdlc_type_trans(skb, dev);
+
+        dev->stats.rx_packets++;
+        dev->stats.rx_bytes += size;
+
+        netif_rx(skb);
+}
+
+static const struct net_device_ops hdlcdev_ops = {
+        .ndo_open       = hdlcdev_open,
+        .ndo_stop       = hdlcdev_close,
+        .ndo_change_mtu = hdlc_change_mtu,
+        .ndo_start_xmit = hdlc_start_xmit,
+        .ndo_do_ioctl   = hdlcdev_ioctl,
+        .ndo_tx_timeout = hdlcdev_tx_timeout,
+};
+
+/**
+ * called by device driver when adding device instance
+ * do generic HDLC initialization
+ *
+ * info  pointer to device instance information
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_init(struct mgsl_struct *info)
+{
+        int rc;
+        struct net_device *dev;
+        hdlc_device *hdlc;
+
+        /* allocate and initialize network and HDLC layer objects */
+
+        if (!(dev = alloc_hdlcdev(info))) {
+                printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
+                return -ENOMEM;
+        }
+
+        /* for network layer reporting purposes only */
+        dev->base_addr = info->io_base;
+        dev->irq       = info->irq_level;
+        dev->dma       = info->dma_level;
+
+        /* network layer callbacks and settings */
+        dev->netdev_ops     = &hdlcdev_ops;
+        dev->watchdog_timeo = 10 * HZ;
+        dev->tx_queue_len   = 50;
+
+        /* generic HDLC layer callbacks and settings */
+        hdlc         = dev_to_hdlc(dev);
+        hdlc->attach = hdlcdev_attach;
+        hdlc->xmit   = hdlcdev_xmit;
+
+        /* register objects with HDLC layer */
+        if ((rc = register_hdlc_device(dev))) {
+                printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
+                free_netdev(dev);
+                return rc;
+        }
+
+        info->netdev = dev;
+        return 0;
+}
+
+/**
+ * called by device driver when removing device instance
+ * do generic HDLC cleanup
+ *
+ * info  pointer to device instance information
+ */
+static void hdlcdev_exit(struct mgsl_struct *info)
+{
+        unregister_hdlc_device(info->netdev);
+        free_netdev(info->netdev);
+        info->netdev = NULL;
+}
+
+#endif /* CONFIG_HDLC */
+
+
+static int __devinit synclink_init_one (struct pci_dev *dev,
+                                        const struct pci_device_id *ent)
+{
+        struct mgsl_struct *info;
+
+        if (pci_enable_device(dev)) {
+                printk("error enabling pci device %p\n", dev);
+                return -EIO;
+        }
+
+        if (!(info = mgsl_allocate_device())) {
+                printk("can't allocate device instance data.\n");
+                return -EIO;
+        }
+
+        /* Copy user configuration info to device instance data */
+                
+        info->io_base = pci_resource_start(dev, 2);
+        info->irq_level = dev->irq;
+        info->phys_memory_base = pci_resource_start(dev, 3);
+                                
+        /* Because veremap only works on page boundaries we must map
+         * a larger area than is actually implemented for the LCR
+         * memory range. We map a full page starting at the page boundary.
+         */
+        info->phys_lcr_base = pci_resource_start(dev, 0);
+        info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
+        info->phys_lcr_base &= ~(PAGE_SIZE-1);
+                                
+        info->bus_type = MGSL_BUS_TYPE_PCI;
+        info->io_addr_size = 8;
+        info->irq_flags = IRQF_SHARED;
+
+        if (dev->device == 0x0210) {
+                /* Version 1 PCI9030 based universal PCI adapter */
+                info->misc_ctrl_value = 0x007c4080;
+                info->hw_version = 1;
+        } else {
+                /* Version 0 PCI9050 based 5V PCI adapter
+                 * A PCI9050 bug prevents reading LCR registers if 
+                 * LCR base address bit 7 is set. Maintain shadow
+                 * value so we can write to LCR misc control reg.
+                 */
+                info->misc_ctrl_value = 0x087e4546;
+                info->hw_version = 0;
+        }
+                                
+        mgsl_add_device(info);
+
+        return 0;
+}
+
+static void __devexit synclink_remove_one (struct pci_dev *dev)
+{
+}
+
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
new file mode 100644
index 000000000000..18b48cd3b41d
--- /dev/null
+++ b/drivers/tty/synclink_gt.c
@@ -0,0 +1,5161 @@
+/*
+ * Device driver for Microgate SyncLink GT serial adapters.
+ *
+ * written by Paul Fulghum for Microgate Corporation
+ * paulkf@microgate.com
+ *
+ * Microgate and SyncLink are trademarks of Microgate Corporation
+ *
+ * This code is released under the GNU General Public License (GPL)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * DEBUG OUTPUT DEFINITIONS
+ *
+ * uncomment lines below to enable specific types of debug output
+ *
+ * DBGINFO   information - most verbose output
+ * DBGERR    serious errors
+ * DBGBH     bottom half service routine debugging
+ * DBGISR    interrupt service routine debugging
+ * DBGDATA   output receive and transmit data
+ * DBGTBUF   output transmit DMA buffers and registers
+ * DBGRBUF   output receive DMA buffers and registers
+ */
+
+#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
+#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
+#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
+#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
+#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
+/*#define DBGTBUF(info) dump_tbufs(info)*/
+/*#define DBGRBUF(info) dump_rbufs(info)*/
+
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/ioctl.h>
+#include <linux/termios.h>
+#include <linux/bitops.h>
+#include <linux/workqueue.h>
+#include <linux/hdlc.h>
+#include <linux/synclink.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+#include <asm/types.h>
+#include <asm/uaccess.h>
+
+#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
+#define SYNCLINK_GENERIC_HDLC 1
+#else
+#define SYNCLINK_GENERIC_HDLC 0
+#endif
+
+/*
+ * module identification
+ */
+static char *driver_name     = "SyncLink GT";
+static char *tty_driver_name = "synclink_gt";
+static char *tty_dev_prefix  = "ttySLG";
+MODULE_LICENSE("GPL");
+#define MGSL_MAGIC 0x5401
+#define MAX_DEVICES 32
+
+static struct pci_device_id pci_table[] = {
+        {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
+        {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
+        {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
+        {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
+        {0,}, /* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, pci_table);
+
+static int  init_one(struct pci_dev *dev,const struct pci_device_id *ent);
+static void remove_one(struct pci_dev *dev);
+static struct pci_driver pci_driver = {
+        .name           = "synclink_gt",
+        .id_table       = pci_table,
+        .probe          = init_one,
+        .remove         = __devexit_p(remove_one),
+};
+
+static bool pci_registered;
+
+/*
+ * module configuration and status
+ */
+static struct slgt_info *slgt_device_list;
+static int slgt_device_count;
+
+static int ttymajor;
+static int debug_level;
+static int maxframe[MAX_DEVICES];
+
+module_param(ttymajor, int, 0);
+module_param(debug_level, int, 0);
+module_param_array(maxframe, int, NULL, 0);
+
+MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
+MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
+MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
+
+/*
+ * tty support and callbacks
+ */
+static struct tty_driver *serial_driver;
+
+static int  open(struct tty_struct *tty, struct file * filp);
+static void close(struct tty_struct *tty, struct file * filp);
+static void hangup(struct tty_struct *tty);
+static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
+
+static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
+static int put_char(struct tty_struct *tty, unsigned char ch);
+static void send_xchar(struct tty_struct *tty, char ch);
+static void wait_until_sent(struct tty_struct *tty, int timeout);
+static int  write_room(struct tty_struct *tty);
+static void flush_chars(struct tty_struct *tty);
+static void flush_buffer(struct tty_struct *tty);
+static void tx_hold(struct tty_struct *tty);
+static void tx_release(struct tty_struct *tty);
+
+static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
+static int  chars_in_buffer(struct tty_struct *tty);
+static void throttle(struct tty_struct * tty);
+static void unthrottle(struct tty_struct * tty);
+static int set_break(struct tty_struct *tty, int break_state);
+
+/*
+ * generic HDLC support and callbacks
+ */
+#if SYNCLINK_GENERIC_HDLC
+#define dev_to_port(D) (dev_to_hdlc(D)->priv)
+static void hdlcdev_tx_done(struct slgt_info *info);
+static void hdlcdev_rx(struct slgt_info *info, char *buf, int size);
+static int  hdlcdev_init(struct slgt_info *info);
+static void hdlcdev_exit(struct slgt_info *info);
+#endif
+
+
+/*
+ * device specific structures, macros and functions
+ */
+
+#define SLGT_MAX_PORTS 4
+#define SLGT_REG_SIZE  256
+
+/*
+ * conditional wait facility
+ */
+struct cond_wait {
+        struct cond_wait *next;
+        wait_queue_head_t q;
+        wait_queue_t wait;
+        unsigned int data;
+};
+static void init_cond_wait(struct cond_wait *w, unsigned int data);
+static void add_cond_wait(struct cond_wait **head, struct cond_wait *w);
+static void remove_cond_wait(struct cond_wait **head, struct cond_wait *w);
+static void flush_cond_wait(struct cond_wait **head);
+
+/*
+ * DMA buffer descriptor and access macros
+ */
+struct slgt_desc
+{
+        __le16 count;
+        __le16 status;
+        __le32 pbuf;  /* physical address of data buffer */
+        __le32 next;  /* physical address of next descriptor */
+
+        /* driver book keeping */
+        char *buf;          /* virtual  address of data buffer */
+        unsigned int pdesc; /* physical address of this descriptor */
+        dma_addr_t buf_dma_addr;
+        unsigned short buf_count;
+};
+
+#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
+#define set_desc_next(a,b) (a).next   = cpu_to_le32((unsigned int)(b))
+#define set_desc_count(a,b)(a).count  = cpu_to_le16((unsigned short)(b))
+#define set_desc_eof(a,b)  (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
+#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
+#define desc_count(a)      (le16_to_cpu((a).count))
+#define desc_status(a)     (le16_to_cpu((a).status))
+#define desc_complete(a)   (le16_to_cpu((a).status) & BIT15)
+#define desc_eof(a)        (le16_to_cpu((a).status) & BIT2)
+#define desc_crc_error(a)  (le16_to_cpu((a).status) & BIT1)
+#define desc_abort(a)      (le16_to_cpu((a).status) & BIT0)
+#define desc_residue(a)    ((le16_to_cpu((a).status) & 0x38) >> 3)
+
+struct _input_signal_events {
+        int ri_up;
+        int ri_down;
+        int dsr_up;
+        int dsr_down;
+        int dcd_up;
+        int dcd_down;
+        int cts_up;
+        int cts_down;
+};
+
+/*
+ * device instance data structure
+ */
+struct slgt_info {
+        void *if_ptr;           /* General purpose pointer (used by SPPP) */
+        struct tty_port port;
+
+        struct slgt_info *next_device;  /* device list link */
+
+        int magic;
+
+        char device_name[25];
+        struct pci_dev *pdev;
+
+        int port_count;  /* count of ports on adapter */
+        int adapter_num; /* adapter instance number */
+        int port_num;    /* port instance number */
+
+        /* array of pointers to port contexts on this adapter */
+        struct slgt_info *port_array[SLGT_MAX_PORTS];
+
+        int                     line;           /* tty line instance number */
+
+        struct mgsl_icount      icount;
+
+        int                     timeout;
+        int                     x_char;         /* xon/xoff character */
+        unsigned int            read_status_mask;
+        unsigned int            ignore_status_mask;
+
+        wait_queue_head_t       status_event_wait_q;
+        wait_queue_head_t       event_wait_q;
+        struct timer_list       tx_timer;
+        struct timer_list       rx_timer;
+
+        unsigned int            gpio_present;
+        struct cond_wait        *gpio_wait_q;
+
+        spinlock_t lock;        /* spinlock for synchronizing with ISR */
+
+        struct work_struct task;
+        u32 pending_bh;
+        bool bh_requested;
+        bool bh_running;
+
+        int isr_overflow;
+        bool irq_requested;     /* true if IRQ requested */
+        bool irq_occurred;      /* for diagnostics use */
+
+        /* device configuration */
+
+        unsigned int bus_type;
+        unsigned int irq_level;
+        unsigned long irq_flags;
+
+        unsigned char __iomem * reg_addr;  /* memory mapped registers address */
+        u32 phys_reg_addr;
+        bool reg_addr_requested;
+
+        MGSL_PARAMS params;       /* communications parameters */
+        u32 idle_mode;
+        u32 max_frame_size;       /* as set by device config */
+
+        unsigned int rbuf_fill_level;
+        unsigned int rx_pio;
+        unsigned int if_mode;
+        unsigned int base_clock;
+        unsigned int xsync;
+        unsigned int xctrl;
+
+        /* device status */
+
+        bool rx_enabled;
+        bool rx_restart;
+
+        bool tx_enabled;
+        bool tx_active;
+
+        unsigned char signals;    /* serial signal states */
+        int init_error;  /* initialization error */
+
+        unsigned char *tx_buf;
+        int tx_count;
+
+        char flag_buf[MAX_ASYNC_BUFFER_SIZE];
+        char char_buf[MAX_ASYNC_BUFFER_SIZE];
+        bool drop_rts_on_tx_done;
+        struct  _input_signal_events    input_signal_events;
+
+        int dcd_chkcount;       /* check counts to prevent */
+        int cts_chkcount;       /* too many IRQs if a signal */
+        int dsr_chkcount;       /* is floating */
+        int ri_chkcount;
+
+        char *bufs;             /* virtual address of DMA buffer lists */
+        dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
+
+        unsigned int rbuf_count;
+        struct slgt_desc *rbufs;
+        unsigned int rbuf_current;
+        unsigned int rbuf_index;
+        unsigned int rbuf_fill_index;
+        unsigned short rbuf_fill_count;
+
+        unsigned int tbuf_count;
+        struct slgt_desc *tbufs;
+        unsigned int tbuf_current;
+        unsigned int tbuf_start;
+
+        unsigned char *tmp_rbuf;
+        unsigned int tmp_rbuf_count;
+
+        /* SPPP/Cisco HDLC device parts */
+
+        int netcount;
+        spinlock_t netlock;
+#if SYNCLINK_GENERIC_HDLC
+        struct net_device *netdev;
+#endif
+
+};
+
+static MGSL_PARAMS default_params = {
+        .mode            = MGSL_MODE_HDLC,
+        .loopback        = 0,
+        .flags           = HDLC_FLAG_UNDERRUN_ABORT15,
+        .encoding        = HDLC_ENCODING_NRZI_SPACE,
+        .clock_speed     = 0,
+        .addr_filter     = 0xff,
+        .crc_type        = HDLC_CRC_16_CCITT,
+        .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
+        .preamble        = HDLC_PREAMBLE_PATTERN_NONE,
+        .data_rate       = 9600,
+        .data_bits       = 8,
+        .stop_bits       = 1,
+        .parity          = ASYNC_PARITY_NONE
+};
+
+
+#define BH_RECEIVE  1
+#define BH_TRANSMIT 2
+#define BH_STATUS   4
+#define IO_PIN_SHUTDOWN_LIMIT 100
+
+#define DMABUFSIZE 256
+#define DESC_LIST_SIZE 4096
+
+#define MASK_PARITY  BIT1
+#define MASK_FRAMING BIT0
+#define MASK_BREAK   BIT14
+#define MASK_OVERRUN BIT4
+
+#define GSR   0x00 /* global status */
+#define JCR   0x04 /* JTAG control */
+#define IODR  0x08 /* GPIO direction */
+#define IOER  0x0c /* GPIO interrupt enable */
+#define IOVR  0x10 /* GPIO value */
+#define IOSR  0x14 /* GPIO interrupt status */
+#define TDR   0x80 /* tx data */
+#define RDR   0x80 /* rx data */
+#define TCR   0x82 /* tx control */
+#define TIR   0x84 /* tx idle */
+#define TPR   0x85 /* tx preamble */
+#define RCR   0x86 /* rx control */
+#define VCR   0x88 /* V.24 control */
+#define CCR   0x89 /* clock control */
+#define BDR   0x8a /* baud divisor */
+#define SCR   0x8c /* serial control */
+#define SSR   0x8e /* serial status */
+#define RDCSR 0x90 /* rx DMA control/status */
+#define TDCSR 0x94 /* tx DMA control/status */
+#define RDDAR 0x98 /* rx DMA descriptor address */
+#define TDDAR 0x9c /* tx DMA descriptor address */
+#define XSR   0x40 /* extended sync pattern */
+#define XCR   0x44 /* extended control */
+
+#define RXIDLE      BIT14
+#define RXBREAK     BIT14
+#define IRQ_TXDATA  BIT13
+#define IRQ_TXIDLE  BIT12
+#define IRQ_TXUNDER BIT11 /* HDLC */
+#define IRQ_RXDATA  BIT10
+#define IRQ_RXIDLE  BIT9  /* HDLC */
+#define IRQ_RXBREAK BIT9  /* async */
+#define IRQ_RXOVER  BIT8
+#define IRQ_DSR     BIT7
+#define IRQ_CTS     BIT6
+#define IRQ_DCD     BIT5
+#define IRQ_RI      BIT4
+#define IRQ_ALL     0x3ff0
+#define IRQ_MASTER  BIT0
+
+#define slgt_irq_on(info, mask) \
+        wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
+#define slgt_irq_off(info, mask) \
+        wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
+
+static __u8  rd_reg8(struct slgt_info *info, unsigned int addr);
+static void  wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
+static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
+static void  wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
+static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
+static void  wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
+
+static void  msc_set_vcr(struct slgt_info *info);
+
+static int  startup(struct slgt_info *info);
+static int  block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
+static void shutdown(struct slgt_info *info);
+static void program_hw(struct slgt_info *info);
+static void change_params(struct slgt_info *info);
+
+static int  register_test(struct slgt_info *info);
+static int  irq_test(struct slgt_info *info);
+static int  loopback_test(struct slgt_info *info);
+static int  adapter_test(struct slgt_info *info);
+
+static void reset_adapter(struct slgt_info *info);
+static void reset_port(struct slgt_info *info);
+static void async_mode(struct slgt_info *info);
+static void sync_mode(struct slgt_info *info);
+
+static void rx_stop(struct slgt_info *info);
+static void rx_start(struct slgt_info *info);
+static void reset_rbufs(struct slgt_info *info);
+static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
+static void rdma_reset(struct slgt_info *info);
+static bool rx_get_frame(struct slgt_info *info);
+static bool rx_get_buf(struct slgt_info *info);
+
+static void tx_start(struct slgt_info *info);
+static void tx_stop(struct slgt_info *info);
+static void tx_set_idle(struct slgt_info *info);
+static unsigned int free_tbuf_count(struct slgt_info *info);
+static unsigned int tbuf_bytes(struct slgt_info *info);
+static void reset_tbufs(struct slgt_info *info);
+static void tdma_reset(struct slgt_info *info);
+static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
+
+static void get_signals(struct slgt_info *info);
+static void set_signals(struct slgt_info *info);
+static void enable_loopback(struct slgt_info *info);
+static void set_rate(struct slgt_info *info, u32 data_rate);
+
+static int  bh_action(struct slgt_info *info);
+static void bh_handler(struct work_struct *work);
+static void bh_transmit(struct slgt_info *info);
+static void isr_serial(struct slgt_info *info);
+static void isr_rdma(struct slgt_info *info);
+static void isr_txeom(struct slgt_info *info, unsigned short status);
+static void isr_tdma(struct slgt_info *info);
+
+static int  alloc_dma_bufs(struct slgt_info *info);
+static void free_dma_bufs(struct slgt_info *info);
+static int  alloc_desc(struct slgt_info *info);
+static void free_desc(struct slgt_info *info);
+static int  alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
+static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count);
+
+static int  alloc_tmp_rbuf(struct slgt_info *info);
+static void free_tmp_rbuf(struct slgt_info *info);
+
+static void tx_timeout(unsigned long context);
+static void rx_timeout(unsigned long context);
+
+/*
+ * ioctl handlers
+ */
+static int  get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
+static int  get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
+static int  set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
+static int  get_txidle(struct slgt_info *info, int __user *idle_mode);
+static int  set_txidle(struct slgt_info *info, int idle_mode);
+static int  tx_enable(struct slgt_info *info, int enable);
+static int  tx_abort(struct slgt_info *info);
+static int  rx_enable(struct slgt_info *info, int enable);
+static int  modem_input_wait(struct slgt_info *info,int arg);
+static int  wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
+static int  tiocmget(struct tty_struct *tty);
+static int  tiocmset(struct tty_struct *tty,
+                                unsigned int set, unsigned int clear);
+static int set_break(struct tty_struct *tty, int break_state);
+static int  get_interface(struct slgt_info *info, int __user *if_mode);
+static int  set_interface(struct slgt_info *info, int if_mode);
+static int  set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
+static int  get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
+static int  wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
+static int  get_xsync(struct slgt_info *info, int __user *if_mode);
+static int  set_xsync(struct slgt_info *info, int if_mode);
+static int  get_xctrl(struct slgt_info *info, int __user *if_mode);
+static int  set_xctrl(struct slgt_info *info, int if_mode);
+
+/*
+ * driver functions
+ */
+static void add_device(struct slgt_info *info);
+static void device_init(int adapter_num, struct pci_dev *pdev);
+static int  claim_resources(struct slgt_info *info);
+static void release_resources(struct slgt_info *info);
+
+/*
+ * DEBUG OUTPUT CODE
+ */
+#ifndef DBGINFO
+#define DBGINFO(fmt)
+#endif
+#ifndef DBGERR
+#define DBGERR(fmt)
+#endif
+#ifndef DBGBH
+#define DBGBH(fmt)
+#endif
+#ifndef DBGISR
+#define DBGISR(fmt)
+#endif
+
+#ifdef DBGDATA
+static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
+{
+        int i;
+        int linecount;
+        printk("%s %s data:\n",info->device_name, label);
+        while(count) {
+                linecount = (count > 16) ? 16 : count;
+                for(i=0; i < linecount; i++)
+                        printk("%02X ",(unsigned char)data[i]);
+                for(;i<17;i++)
+                        printk("   ");
+                for(i=0;i<linecount;i++) {
+                        if (data[i]>=040 && data[i]<=0176)
+                                printk("%c",data[i]);
+                        else
+                                printk(".");
+                }
+                printk("\n");
+                data  += linecount;
+                count -= linecount;
+        }
+}
+#else
+#define DBGDATA(info, buf, size, label)
+#endif
+
+#ifdef DBGTBUF
+static void dump_tbufs(struct slgt_info *info)
+{
+        int i;
+        printk("tbuf_current=%d\n", info->tbuf_current);
+        for (i=0 ; i < info->tbuf_count ; i++) {
+                printk("%d: count=%04X status=%04X\n",
+                        i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
+        }
+}
+#else
+#define DBGTBUF(info)
+#endif
+
+#ifdef DBGRBUF
+static void dump_rbufs(struct slgt_info *info)
+{
+        int i;
+        printk("rbuf_current=%d\n", info->rbuf_current);
+        for (i=0 ; i < info->rbuf_count ; i++) {
+                printk("%d: count=%04X status=%04X\n",
+                        i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
+        }
+}
+#else
+#define DBGRBUF(info)
+#endif
+
+static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
+{
+#ifdef SANITY_CHECK
+        if (!info) {
+                printk("null struct slgt_info for (%s) in %s\n", devname, name);
+                return 1;
+        }
+        if (info->magic != MGSL_MAGIC) {
+                printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
+                return 1;
+        }
+#else
+        if (!info)
+                return 1;
+#endif
+        return 0;
+}
+
+/**
+ * line discipline callback wrappers
+ *
+ * The wrappers maintain line discipline references
+ * while calling into the line discipline.
+ *
+ * ldisc_receive_buf  - pass receive data to line discipline
+ */
+static void ldisc_receive_buf(struct tty_struct *tty,
+                              const __u8 *data, char *flags, int count)
+{
+        struct tty_ldisc *ld;
+        if (!tty)
+                return;
+        ld = tty_ldisc_ref(tty);
+        if (ld) {
+                if (ld->ops->receive_buf)
+                        ld->ops->receive_buf(tty, data, flags, count);
+                tty_ldisc_deref(ld);
+        }
+}
+
+/* tty callbacks */
+
+static int open(struct tty_struct *tty, struct file *filp)
+{
+        struct slgt_info *info;
+        int retval, line;
+        unsigned long flags;
+
+        line = tty->index;
+        if ((line < 0) || (line >= slgt_device_count)) {
+                DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
+                return -ENODEV;
+        }
+
+        info = slgt_device_list;
+        while(info && info->line != line)
+                info = info->next_device;
+        if (sanity_check(info, tty->name, "open"))
+                return -ENODEV;
+        if (info->init_error) {
+                DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
+                return -ENODEV;
+        }
+
+        tty->driver_data = info;
+        info->port.tty = tty;
+
+        DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
+
+        /* If port is closing, signal caller to try again */
+        if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
+                if (info->port.flags & ASYNC_CLOSING)
+                        interruptible_sleep_on(&info->port.close_wait);
+                retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
+                        -EAGAIN : -ERESTARTSYS);
+                goto cleanup;
+        }
+
+        mutex_lock(&info->port.mutex);
+        info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+        spin_lock_irqsave(&info->netlock, flags);
+        if (info->netcount) {
+                retval = -EBUSY;
+                spin_unlock_irqrestore(&info->netlock, flags);
+                mutex_unlock(&info->port.mutex);
+                goto cleanup;
+        }
+        info->port.count++;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        if (info->port.count == 1) {
+                /* 1st open on this device, init hardware */
+                retval = startup(info);
+                if (retval < 0) {
+                        mutex_unlock(&info->port.mutex);
+                        goto cleanup;
+                }
+        }
+        mutex_unlock(&info->port.mutex);
+        retval = block_til_ready(tty, filp, info);
+        if (retval) {
+                DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
+                goto cleanup;
+        }
+
+        retval = 0;
+
+cleanup:
+        if (retval) {
+                if (tty->count == 1)
+                        info->port.tty = NULL; /* tty layer will release tty struct */
+                if(info->port.count)
+                        info->port.count--;
+        }
+
+        DBGINFO(("%s open rc=%d\n", info->device_name, retval));
+        return retval;
+}
+
+static void close(struct tty_struct *tty, struct file *filp)
+{
+        struct slgt_info *info = tty->driver_data;
+
+        if (sanity_check(info, tty->name, "close"))
+                return;
+        DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
+
+        if (tty_port_close_start(&info->port, tty, filp) == 0)
+                goto cleanup;
+
+        mutex_lock(&info->port.mutex);
+        if (info->port.flags & ASYNC_INITIALIZED)
+                wait_until_sent(tty, info->timeout);
+        flush_buffer(tty);
+        tty_ldisc_flush(tty);
+
+        shutdown(info);
+        mutex_unlock(&info->port.mutex);
+
+        tty_port_close_end(&info->port, tty);
+        info->port.tty = NULL;
+cleanup:
+        DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
+}
+
+static void hangup(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "hangup"))
+                return;
+        DBGINFO(("%s hangup\n", info->device_name));
+
+        flush_buffer(tty);
+
+        mutex_lock(&info->port.mutex);
+        shutdown(info);
+
+        spin_lock_irqsave(&info->port.lock, flags);
+        info->port.count = 0;
+        info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
+        info->port.tty = NULL;
+        spin_unlock_irqrestore(&info->port.lock, flags);
+        mutex_unlock(&info->port.mutex);
+
+        wake_up_interruptible(&info->port.open_wait);
+}
+
+static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        DBGINFO(("%s set_termios\n", tty->driver->name));
+
+        change_params(info);
+
+        /* Handle transition to B0 status */
+        if (old_termios->c_cflag & CBAUD &&
+            !(tty->termios->c_cflag & CBAUD)) {
+                info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                spin_lock_irqsave(&info->lock,flags);
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+
+        /* Handle transition away from B0 status */
+        if (!(old_termios->c_cflag & CBAUD) &&
+            tty->termios->c_cflag & CBAUD) {
+                info->signals |= SerialSignal_DTR;
+                if (!(tty->termios->c_cflag & CRTSCTS) ||
+                    !test_bit(TTY_THROTTLED, &tty->flags)) {
+                        info->signals |= SerialSignal_RTS;
+                }
+                spin_lock_irqsave(&info->lock,flags);
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+
+        /* Handle turning off CRTSCTS */
+        if (old_termios->c_cflag & CRTSCTS &&
+            !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                tx_release(tty);
+        }
+}
+
+static void update_tx_timer(struct slgt_info *info)
+{
+        /*
+         * use worst case speed of 1200bps to calculate transmit timeout
+         * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
+         */
+        if (info->params.mode == MGSL_MODE_HDLC) {
+                int timeout  = (tbuf_bytes(info) * 7) + 1000;
+                mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
+        }
+}
+
+static int write(struct tty_struct *tty,
+                 const unsigned char *buf, int count)
+{
+        int ret = 0;
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "write"))
+                return -EIO;
+
+        DBGINFO(("%s write count=%d\n", info->device_name, count));
+
+        if (!info->tx_buf || (count > info->max_frame_size))
+                return -EIO;
+
+        if (!count || tty->stopped || tty->hw_stopped)
+                return 0;
+
+        spin_lock_irqsave(&info->lock, flags);
+
+        if (info->tx_count) {
+                /* send accumulated data from send_char() */
+                if (!tx_load(info, info->tx_buf, info->tx_count))
+                        goto cleanup;
+                info->tx_count = 0;
+        }
+
+        if (tx_load(info, buf, count))
+                ret = count;
+
+cleanup:
+        spin_unlock_irqrestore(&info->lock, flags);
+        DBGINFO(("%s write rc=%d\n", info->device_name, ret));
+        return ret;
+}
+
+static int put_char(struct tty_struct *tty, unsigned char ch)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+        int ret = 0;
+
+        if (sanity_check(info, tty->name, "put_char"))
+                return 0;
+        DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
+        if (!info->tx_buf)
+                return 0;
+        spin_lock_irqsave(&info->lock,flags);
+        if (info->tx_count < info->max_frame_size) {
+                info->tx_buf[info->tx_count++] = ch;
+                ret = 1;
+        }
+        spin_unlock_irqrestore(&info->lock,flags);
+        return ret;
+}
+
+static void send_xchar(struct tty_struct *tty, char ch)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "send_xchar"))
+                return;
+        DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
+        info->x_char = ch;
+        if (ch) {
+                spin_lock_irqsave(&info->lock,flags);
+                if (!info->tx_enabled)
+                        tx_start(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+}
+
+static void wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long orig_jiffies, char_time;
+
+        if (!info )
+                return;
+        if (sanity_check(info, tty->name, "wait_until_sent"))
+                return;
+        DBGINFO(("%s wait_until_sent entry\n", info->device_name));
+        if (!(info->port.flags & ASYNC_INITIALIZED))
+                goto exit;
+
+        orig_jiffies = jiffies;
+
+        /* Set check interval to 1/5 of estimated time to
+         * send a character, and make it at least 1. The check
+         * interval should also be less than the timeout.
+         * Note: use tight timings here to satisfy the NIST-PCTS.
+         */
+
+        if (info->params.data_rate) {
+                char_time = info->timeout/(32 * 5);
+                if (!char_time)
+                        char_time++;
+        } else
+                char_time = 1;
+
+        if (timeout)
+                char_time = min_t(unsigned long, char_time, timeout);
+
+        while (info->tx_active) {
+                msleep_interruptible(jiffies_to_msecs(char_time));
+                if (signal_pending(current))
+                        break;
+                if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                        break;
+        }
+exit:
+        DBGINFO(("%s wait_until_sent exit\n", info->device_name));
+}
+
+static int write_room(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        int ret;
+
+        if (sanity_check(info, tty->name, "write_room"))
+                return 0;
+        ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
+        DBGINFO(("%s write_room=%d\n", info->device_name, ret));
+        return ret;
+}
+
+static void flush_chars(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "flush_chars"))
+                return;
+        DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
+
+        if (info->tx_count <= 0 || tty->stopped ||
+            tty->hw_stopped || !info->tx_buf)
+                return;
+
+        DBGINFO(("%s flush_chars start transmit\n", info->device_name));
+
+        spin_lock_irqsave(&info->lock,flags);
+        if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
+                info->tx_count = 0;
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+static void flush_buffer(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "flush_buffer"))
+                return;
+        DBGINFO(("%s flush_buffer\n", info->device_name));
+
+        spin_lock_irqsave(&info->lock, flags);
+        info->tx_count = 0;
+        spin_unlock_irqrestore(&info->lock, flags);
+
+        tty_wakeup(tty);
+}
+
+/*
+ * throttle (stop) transmitter
+ */
+static void tx_hold(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "tx_hold"))
+                return;
+        DBGINFO(("%s tx_hold\n", info->device_name));
+        spin_lock_irqsave(&info->lock,flags);
+        if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
+                tx_stop(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+/*
+ * release (start) transmitter
+ */
+static void tx_release(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "tx_release"))
+                return;
+        DBGINFO(("%s tx_release\n", info->device_name));
+        spin_lock_irqsave(&info->lock, flags);
+        if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
+                info->tx_count = 0;
+        spin_unlock_irqrestore(&info->lock, flags);
+}
+
+/*
+ * Service an IOCTL request
+ *
+ * Arguments
+ *
+ *      tty     pointer to tty instance data
+ *      cmd     IOCTL command code
+ *      arg     command argument/context
+ *
+ * Return 0 if success, otherwise error code
+ */
+static int ioctl(struct tty_struct *tty,
+                 unsigned int cmd, unsigned long arg)
+{
+        struct slgt_info *info = tty->driver_data;
+        void __user *argp = (void __user *)arg;
+        int ret;
+
+        if (sanity_check(info, tty->name, "ioctl"))
+                return -ENODEV;
+        DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
+
+        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+            (cmd != TIOCMIWAIT)) {
+                if (tty->flags & (1 << TTY_IO_ERROR))
+                    return -EIO;
+        }
+
+        switch (cmd) {
+        case MGSL_IOCWAITEVENT:
+                return wait_mgsl_event(info, argp);
+        case TIOCMIWAIT:
+                return modem_input_wait(info,(int)arg);
+        case MGSL_IOCSGPIO:
+                return set_gpio(info, argp);
+        case MGSL_IOCGGPIO:
+                return get_gpio(info, argp);
+        case MGSL_IOCWAITGPIO:
+                return wait_gpio(info, argp);
+        case MGSL_IOCGXSYNC:
+                return get_xsync(info, argp);
+        case MGSL_IOCSXSYNC:
+                return set_xsync(info, (int)arg);
+        case MGSL_IOCGXCTRL:
+                return get_xctrl(info, argp);
+        case MGSL_IOCSXCTRL:
+                return set_xctrl(info, (int)arg);
+        }
+        mutex_lock(&info->port.mutex);
+        switch (cmd) {
+        case MGSL_IOCGPARAMS:
+                ret = get_params(info, argp);
+                break;
+        case MGSL_IOCSPARAMS:
+                ret = set_params(info, argp);
+                break;
+        case MGSL_IOCGTXIDLE:
+                ret = get_txidle(info, argp);
+                break;
+        case MGSL_IOCSTXIDLE:
+                ret = set_txidle(info, (int)arg);
+                break;
+        case MGSL_IOCTXENABLE:
+                ret = tx_enable(info, (int)arg);
+                break;
+        case MGSL_IOCRXENABLE:
+                ret = rx_enable(info, (int)arg);
+                break;
+        case MGSL_IOCTXABORT:
+                ret = tx_abort(info);
+                break;
+        case MGSL_IOCGSTATS:
+                ret = get_stats(info, argp);
+                break;
+        case MGSL_IOCGIF:
+                ret = get_interface(info, argp);
+                break;
+        case MGSL_IOCSIF:
+                ret = set_interface(info,(int)arg);
+                break;
+        default:
+                ret = -ENOIOCTLCMD;
+        }
+        mutex_unlock(&info->port.mutex);
+        return ret;
+}
+
+static int get_icount(struct tty_struct *tty,
+                                struct serial_icounter_struct *icount)
+
+{
+        struct slgt_info *info = tty->driver_data;
+        struct mgsl_icount cnow;        /* kernel counter temps */
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+        cnow = info->icount;
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        icount->cts = cnow.cts;
+        icount->dsr = cnow.dsr;
+        icount->rng = cnow.rng;
+        icount->dcd = cnow.dcd;
+        icount->rx = cnow.rx;
+        icount->tx = cnow.tx;
+        icount->frame = cnow.frame;
+        icount->overrun = cnow.overrun;
+        icount->parity = cnow.parity;
+        icount->brk = cnow.brk;
+        icount->buf_overrun = cnow.buf_overrun;
+
+        return 0;
+}
+
+/*
+ * support for 32 bit ioctl calls on 64 bit systems
+ */
+#ifdef CONFIG_COMPAT
+static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
+{
+        struct MGSL_PARAMS32 tmp_params;
+
+        DBGINFO(("%s get_params32\n", info->device_name));
+        memset(&tmp_params, 0, sizeof(tmp_params));
+        tmp_params.mode            = (compat_ulong_t)info->params.mode;
+        tmp_params.loopback        = info->params.loopback;
+        tmp_params.flags           = info->params.flags;
+        tmp_params.encoding        = info->params.encoding;
+        tmp_params.clock_speed     = (compat_ulong_t)info->params.clock_speed;
+        tmp_params.addr_filter     = info->params.addr_filter;
+        tmp_params.crc_type        = info->params.crc_type;
+        tmp_params.preamble_length = info->params.preamble_length;
+        tmp_params.preamble        = info->params.preamble;
+        tmp_params.data_rate       = (compat_ulong_t)info->params.data_rate;
+        tmp_params.data_bits       = info->params.data_bits;
+        tmp_params.stop_bits       = info->params.stop_bits;
+        tmp_params.parity          = info->params.parity;
+        if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
+                return -EFAULT;
+        return 0;
+}
+
+static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
+{
+        struct MGSL_PARAMS32 tmp_params;
+
+        DBGINFO(("%s set_params32\n", info->device_name));
+        if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
+                return -EFAULT;
+
+        spin_lock(&info->lock);
+        if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
+                info->base_clock = tmp_params.clock_speed;
+        } else {
+                info->params.mode            = tmp_params.mode;
+                info->params.loopback        = tmp_params.loopback;
+                info->params.flags           = tmp_params.flags;
+                info->params.encoding        = tmp_params.encoding;
+                info->params.clock_speed     = tmp_params.clock_speed;
+                info->params.addr_filter     = tmp_params.addr_filter;
+                info->params.crc_type        = tmp_params.crc_type;
+                info->params.preamble_length = tmp_params.preamble_length;
+                info->params.preamble        = tmp_params.preamble;
+                info->params.data_rate       = tmp_params.data_rate;
+                info->params.data_bits       = tmp_params.data_bits;
+                info->params.stop_bits       = tmp_params.stop_bits;
+                info->params.parity          = tmp_params.parity;
+        }
+        spin_unlock(&info->lock);
+
+        program_hw(info);
+
+        return 0;
+}
+
+static long slgt_compat_ioctl(struct tty_struct *tty,
+                         unsigned int cmd, unsigned long arg)
+{
+        struct slgt_info *info = tty->driver_data;
+        int rc = -ENOIOCTLCMD;
+
+        if (sanity_check(info, tty->name, "compat_ioctl"))
+                return -ENODEV;
+        DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
+
+        switch (cmd) {
+
+        case MGSL_IOCSPARAMS32:
+                rc = set_params32(info, compat_ptr(arg));
+                break;
+
+        case MGSL_IOCGPARAMS32:
+                rc = get_params32(info, compat_ptr(arg));
+                break;
+
+        case MGSL_IOCGPARAMS:
+        case MGSL_IOCSPARAMS:
+        case MGSL_IOCGTXIDLE:
+        case MGSL_IOCGSTATS:
+        case MGSL_IOCWAITEVENT:
+        case MGSL_IOCGIF:
+        case MGSL_IOCSGPIO:
+        case MGSL_IOCGGPIO:
+        case MGSL_IOCWAITGPIO:
+        case MGSL_IOCGXSYNC:
+        case MGSL_IOCGXCTRL:
+        case MGSL_IOCSTXIDLE:
+        case MGSL_IOCTXENABLE:
+        case MGSL_IOCRXENABLE:
+        case MGSL_IOCTXABORT:
+        case TIOCMIWAIT:
+        case MGSL_IOCSIF:
+        case MGSL_IOCSXSYNC:
+        case MGSL_IOCSXCTRL:
+                rc = ioctl(tty, cmd, arg);
+                break;
+        }
+
+        DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
+        return rc;
+}
+#else
+#define slgt_compat_ioctl NULL
+#endif /* ifdef CONFIG_COMPAT */
+
+/*
+ * proc fs support
+ */
+static inline void line_info(struct seq_file *m, struct slgt_info *info)
+{
+        char stat_buf[30];
+        unsigned long flags;
+
+        seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
+                      info->device_name, info->phys_reg_addr,
+                      info->irq_level, info->max_frame_size);
+
+        /* output current serial signal states */
+        spin_lock_irqsave(&info->lock,flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        stat_buf[0] = 0;
+        stat_buf[1] = 0;
+        if (info->signals & SerialSignal_RTS)
+                strcat(stat_buf, "|RTS");
+        if (info->signals & SerialSignal_CTS)
+                strcat(stat_buf, "|CTS");
+        if (info->signals & SerialSignal_DTR)
+                strcat(stat_buf, "|DTR");
+        if (info->signals & SerialSignal_DSR)
+                strcat(stat_buf, "|DSR");
+        if (info->signals & SerialSignal_DCD)
+                strcat(stat_buf, "|CD");
+        if (info->signals & SerialSignal_RI)
+                strcat(stat_buf, "|RI");
+
+        if (info->params.mode != MGSL_MODE_ASYNC) {
+                seq_printf(m, "\tHDLC txok:%d rxok:%d",
+                               info->icount.txok, info->icount.rxok);
+                if (info->icount.txunder)
+                        seq_printf(m, " txunder:%d", info->icount.txunder);
+                if (info->icount.txabort)
+                        seq_printf(m, " txabort:%d", info->icount.txabort);
+                if (info->icount.rxshort)
+                        seq_printf(m, " rxshort:%d", info->icount.rxshort);
+                if (info->icount.rxlong)
+                        seq_printf(m, " rxlong:%d", info->icount.rxlong);
+                if (info->icount.rxover)
+                        seq_printf(m, " rxover:%d", info->icount.rxover);
+                if (info->icount.rxcrc)
+                        seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
+        } else {
+                seq_printf(m, "\tASYNC tx:%d rx:%d",
+                               info->icount.tx, info->icount.rx);
+                if (info->icount.frame)
+                        seq_printf(m, " fe:%d", info->icount.frame);
+                if (info->icount.parity)
+                        seq_printf(m, " pe:%d", info->icount.parity);
+                if (info->icount.brk)
+                        seq_printf(m, " brk:%d", info->icount.brk);
+                if (info->icount.overrun)
+                        seq_printf(m, " oe:%d", info->icount.overrun);
+        }
+
+        /* Append serial signal status to end */
+        seq_printf(m, " %s\n", stat_buf+1);
+
+        seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
+                       info->tx_active,info->bh_requested,info->bh_running,
+                       info->pending_bh);
+}
+
+/* Called to print information about devices
+ */
+static int synclink_gt_proc_show(struct seq_file *m, void *v)
+{
+        struct slgt_info *info;
+
+        seq_puts(m, "synclink_gt driver\n");
+
+        info = slgt_device_list;
+        while( info ) {
+                line_info(m, info);
+                info = info->next_device;
+        }
+        return 0;
+}
+
+static int synclink_gt_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, synclink_gt_proc_show, NULL);
+}
+
+static const struct file_operations synclink_gt_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = synclink_gt_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/*
+ * return count of bytes in transmit buffer
+ */
+static int chars_in_buffer(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        int count;
+        if (sanity_check(info, tty->name, "chars_in_buffer"))
+                return 0;
+        count = tbuf_bytes(info);
+        DBGINFO(("%s chars_in_buffer()=%d\n", info->device_name, count));
+        return count;
+}
+
+/*
+ * signal remote device to throttle send data (our receive data)
+ */
+static void throttle(struct tty_struct * tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "throttle"))
+                return;
+        DBGINFO(("%s throttle\n", info->device_name));
+        if (I_IXOFF(tty))
+                send_xchar(tty, STOP_CHAR(tty));
+        if (tty->termios->c_cflag & CRTSCTS) {
+                spin_lock_irqsave(&info->lock,flags);
+                info->signals &= ~SerialSignal_RTS;
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+}
+
+/*
+ * signal remote device to stop throttling send data (our receive data)
+ */
+static void unthrottle(struct tty_struct * tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "unthrottle"))
+                return;
+        DBGINFO(("%s unthrottle\n", info->device_name));
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        send_xchar(tty, START_CHAR(tty));
+        }
+        if (tty->termios->c_cflag & CRTSCTS) {
+                spin_lock_irqsave(&info->lock,flags);
+                info->signals |= SerialSignal_RTS;
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+}
+
+/*
+ * set or clear transmit break condition
+ * break_state  -1=set break condition, 0=clear
+ */
+static int set_break(struct tty_struct *tty, int break_state)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned short value;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "set_break"))
+                return -EINVAL;
+        DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
+
+        spin_lock_irqsave(&info->lock,flags);
+        value = rd_reg16(info, TCR);
+        if (break_state == -1)
+                value |= BIT6;
+        else
+                value &= ~BIT6;
+        wr_reg16(info, TCR, value);
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+#if SYNCLINK_GENERIC_HDLC
+
+/**
+ * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
+ * set encoding and frame check sequence (FCS) options
+ *
+ * dev       pointer to network device structure
+ * encoding  serial encoding setting
+ * parity    FCS setting
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
+                          unsigned short parity)
+{
+        struct slgt_info *info = dev_to_port(dev);
+        unsigned char  new_encoding;
+        unsigned short new_crctype;
+
+        /* return error if TTY interface open */
+        if (info->port.count)
+                return -EBUSY;
+
+        DBGINFO(("%s hdlcdev_attach\n", info->device_name));
+
+        switch (encoding)
+        {
+        case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
+        case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
+        case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
+        case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
+        case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
+        default: return -EINVAL;
+        }
+
+        switch (parity)
+        {
+        case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
+        case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
+        case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
+        default: return -EINVAL;
+        }
+
+        info->params.encoding = new_encoding;
+        info->params.crc_type = new_crctype;
+
+        /* if network interface up, reprogram hardware */
+        if (info->netcount)
+                program_hw(info);
+
+        return 0;
+}
+
+/**
+ * called by generic HDLC layer to send frame
+ *
+ * skb  socket buffer containing HDLC frame
+ * dev  pointer to network device structure
+ */
+static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
+                                      struct net_device *dev)
+{
+        struct slgt_info *info = dev_to_port(dev);
+        unsigned long flags;
+
+        DBGINFO(("%s hdlc_xmit\n", dev->name));
+
+        if (!skb->len)
+                return NETDEV_TX_OK;
+
+        /* stop sending until this frame completes */
+        netif_stop_queue(dev);
+
+        /* update network statistics */
+        dev->stats.tx_packets++;
+        dev->stats.tx_bytes += skb->len;
+
+        /* save start time for transmit timeout detection */
+        dev->trans_start = jiffies;
+
+        spin_lock_irqsave(&info->lock, flags);
+        tx_load(info, skb->data, skb->len);
+        spin_unlock_irqrestore(&info->lock, flags);
+
+        /* done with socket buffer, so free it */
+        dev_kfree_skb(skb);
+
+        return NETDEV_TX_OK;
+}
+
+/**
+ * called by network layer when interface enabled
+ * claim resources and initialize hardware
+ *
+ * dev  pointer to network device structure
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_open(struct net_device *dev)
+{
+        struct slgt_info *info = dev_to_port(dev);
+        int rc;
+        unsigned long flags;
+
+        if (!try_module_get(THIS_MODULE))
+                return -EBUSY;
+
+        DBGINFO(("%s hdlcdev_open\n", dev->name));
+
+        /* generic HDLC layer open processing */
+        if ((rc = hdlc_open(dev)))
+                return rc;
+
+        /* arbitrate between network and tty opens */
+        spin_lock_irqsave(&info->netlock, flags);
+        if (info->port.count != 0 || info->netcount != 0) {
+                DBGINFO(("%s hdlc_open busy\n", dev->name));
+                spin_unlock_irqrestore(&info->netlock, flags);
+                return -EBUSY;
+        }
+        info->netcount=1;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        /* claim resources and init adapter */
+        if ((rc = startup(info)) != 0) {
+                spin_lock_irqsave(&info->netlock, flags);
+                info->netcount=0;
+                spin_unlock_irqrestore(&info->netlock, flags);
+                return rc;
+        }
+
+        /* assert DTR and RTS, apply hardware settings */
+        info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+        program_hw(info);
+
+        /* enable network layer transmit */
+        dev->trans_start = jiffies;
+        netif_start_queue(dev);
+
+        /* inform generic HDLC layer of current DCD status */
+        spin_lock_irqsave(&info->lock, flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock, flags);
+        if (info->signals & SerialSignal_DCD)
+                netif_carrier_on(dev);
+        else
+                netif_carrier_off(dev);
+        return 0;
+}
+
+/**
+ * called by network layer when interface is disabled
+ * shutdown hardware and release resources
+ *
+ * dev  pointer to network device structure
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_close(struct net_device *dev)
+{
+        struct slgt_info *info = dev_to_port(dev);
+        unsigned long flags;
+
+        DBGINFO(("%s hdlcdev_close\n", dev->name));
+
+        netif_stop_queue(dev);
+
+        /* shutdown adapter and release resources */
+        shutdown(info);
+
+        hdlc_close(dev);
+
+        spin_lock_irqsave(&info->netlock, flags);
+        info->netcount=0;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        module_put(THIS_MODULE);
+        return 0;
+}
+
+/**
+ * called by network layer to process IOCTL call to network device
+ *
+ * dev  pointer to network device structure
+ * ifr  pointer to network interface request structure
+ * cmd  IOCTL command code
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+        const size_t size = sizeof(sync_serial_settings);
+        sync_serial_settings new_line;
+        sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
+        struct slgt_info *info = dev_to_port(dev);
+        unsigned int flags;
+
+        DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
+
+        /* return error if TTY interface open */
+        if (info->port.count)
+                return -EBUSY;
+
+        if (cmd != SIOCWANDEV)
+                return hdlc_ioctl(dev, ifr, cmd);
+
+        memset(&new_line, 0, sizeof(new_line));
+
+        switch(ifr->ifr_settings.type) {
+        case IF_GET_IFACE: /* return current sync_serial_settings */
+
+                ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
+                if (ifr->ifr_settings.size < size) {
+                        ifr->ifr_settings.size = size; /* data size wanted */
+                        return -ENOBUFS;
+                }
+
+                flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                              HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                              HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                              HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
+
+                switch (flags){
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
+                case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
+                default: new_line.clock_type = CLOCK_DEFAULT;
+                }
+
+                new_line.clock_rate = info->params.clock_speed;
+                new_line.loopback   = info->params.loopback ? 1:0;
+
+                if (copy_to_user(line, &new_line, size))
+                        return -EFAULT;
+                return 0;
+
+        case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
+
+                if(!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                if (copy_from_user(&new_line, line, size))
+                        return -EFAULT;
+
+                switch (new_line.clock_type)
+                {
+                case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
+                case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
+                case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
+                case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
+                case CLOCK_DEFAULT:  flags = info->params.flags &
+                                             (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                              HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                              HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                              HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
+                default: return -EINVAL;
+                }
+
+                if (new_line.loopback != 0 && new_line.loopback != 1)
+                        return -EINVAL;
+
+                info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                        HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                        HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                        HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
+                info->params.flags |= flags;
+
+                info->params.loopback = new_line.loopback;
+
+                if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
+                        info->params.clock_speed = new_line.clock_rate;
+                else
+                        info->params.clock_speed = 0;
+
+                /* if network interface up, reprogram hardware */
+                if (info->netcount)
+                        program_hw(info);
+                return 0;
+
+        default:
+                return hdlc_ioctl(dev, ifr, cmd);
+        }
+}
+
+/**
+ * called by network layer when transmit timeout is detected
+ *
+ * dev  pointer to network device structure
+ */
+static void hdlcdev_tx_timeout(struct net_device *dev)
+{
+        struct slgt_info *info = dev_to_port(dev);
+        unsigned long flags;
+
+        DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
+
+        dev->stats.tx_errors++;
+        dev->stats.tx_aborted_errors++;
+
+        spin_lock_irqsave(&info->lock,flags);
+        tx_stop(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        netif_wake_queue(dev);
+}
+
+/**
+ * called by device driver when transmit completes
+ * reenable network layer transmit if stopped
+ *
+ * info  pointer to device instance information
+ */
+static void hdlcdev_tx_done(struct slgt_info *info)
+{
+        if (netif_queue_stopped(info->netdev))
+                netif_wake_queue(info->netdev);
+}
+
+/**
+ * called by device driver when frame received
+ * pass frame to network layer
+ *
+ * info  pointer to device instance information
+ * buf   pointer to buffer contianing frame data
+ * size  count of data bytes in buf
+ */
+static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
+{
+        struct sk_buff *skb = dev_alloc_skb(size);
+        struct net_device *dev = info->netdev;
+
+        DBGINFO(("%s hdlcdev_rx\n", dev->name));
+
+        if (skb == NULL) {
+                DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
+                dev->stats.rx_dropped++;
+                return;
+        }
+
+        memcpy(skb_put(skb, size), buf, size);
+
+        skb->protocol = hdlc_type_trans(skb, dev);
+
+        dev->stats.rx_packets++;
+        dev->stats.rx_bytes += size;
+
+        netif_rx(skb);
+}
+
+static const struct net_device_ops hdlcdev_ops = {
+        .ndo_open       = hdlcdev_open,
+        .ndo_stop       = hdlcdev_close,
+        .ndo_change_mtu = hdlc_change_mtu,
+        .ndo_start_xmit = hdlc_start_xmit,
+        .ndo_do_ioctl   = hdlcdev_ioctl,
+        .ndo_tx_timeout = hdlcdev_tx_timeout,
+};
+
+/**
+ * called by device driver when adding device instance
+ * do generic HDLC initialization
+ *
+ * info  pointer to device instance information
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_init(struct slgt_info *info)
+{
+        int rc;
+        struct net_device *dev;
+        hdlc_device *hdlc;
+
+        /* allocate and initialize network and HDLC layer objects */
+
+        if (!(dev = alloc_hdlcdev(info))) {
+                printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
+                return -ENOMEM;
+        }
+
+        /* for network layer reporting purposes only */
+        dev->mem_start = info->phys_reg_addr;
+        dev->mem_end   = info->phys_reg_addr + SLGT_REG_SIZE - 1;
+        dev->irq       = info->irq_level;
+
+        /* network layer callbacks and settings */
+        dev->netdev_ops     = &hdlcdev_ops;
+        dev->watchdog_timeo = 10 * HZ;
+        dev->tx_queue_len   = 50;
+
+        /* generic HDLC layer callbacks and settings */
+        hdlc         = dev_to_hdlc(dev);
+        hdlc->attach = hdlcdev_attach;
+        hdlc->xmit   = hdlcdev_xmit;
+
+        /* register objects with HDLC layer */
+        if ((rc = register_hdlc_device(dev))) {
+                printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
+                free_netdev(dev);
+                return rc;
+        }
+
+        info->netdev = dev;
+        return 0;
+}
+
+/**
+ * called by device driver when removing device instance
+ * do generic HDLC cleanup
+ *
+ * info  pointer to device instance information
+ */
+static void hdlcdev_exit(struct slgt_info *info)
+{
+        unregister_hdlc_device(info->netdev);
+        free_netdev(info->netdev);
+        info->netdev = NULL;
+}
+
+#endif /* ifdef CONFIG_HDLC */
+
+/*
+ * get async data from rx DMA buffers
+ */
+static void rx_async(struct slgt_info *info)
+{
+        struct tty_struct *tty = info->port.tty;
+        struct mgsl_icount *icount = &info->icount;
+        unsigned int start, end;
+        unsigned char *p;
+        unsigned char status;
+        struct slgt_desc *bufs = info->rbufs;
+        int i, count;
+        int chars = 0;
+        int stat;
+        unsigned char ch;
+
+        start = end = info->rbuf_current;
+
+        while(desc_complete(bufs[end])) {
+                count = desc_count(bufs[end]) - info->rbuf_index;
+                p     = bufs[end].buf + info->rbuf_index;
+
+                DBGISR(("%s rx_async count=%d\n", info->device_name, count));
+                DBGDATA(info, p, count, "rx");
+
+                for(i=0 ; i < count; i+=2, p+=2) {
+                        ch = *p;
+                        icount->rx++;
+
+                        stat = 0;
+
+                        if ((status = *(p+1) & (BIT1 + BIT0))) {
+                                if (status & BIT1)
+                                        icount->parity++;
+                                else if (status & BIT0)
+                                        icount->frame++;
+                                /* discard char if tty control flags say so */
+                                if (status & info->ignore_status_mask)
+                                        continue;
+                                if (status & BIT1)
+                                        stat = TTY_PARITY;
+                                else if (status & BIT0)
+                                        stat = TTY_FRAME;
+                        }
+                        if (tty) {
+                                tty_insert_flip_char(tty, ch, stat);
+                                chars++;
+                        }
+                }
+
+                if (i < count) {
+                        /* receive buffer not completed */
+                        info->rbuf_index += i;
+                        mod_timer(&info->rx_timer, jiffies + 1);
+                        break;
+                }
+
+                info->rbuf_index = 0;
+                free_rbufs(info, end, end);
+
+                if (++end == info->rbuf_count)
+                        end = 0;
+
+                /* if entire list searched then no frame available */
+                if (end == start)
+                        break;
+        }
+
+        if (tty && chars)
+                tty_flip_buffer_push(tty);
+}
+
+/*
+ * return next bottom half action to perform
+ */
+static int bh_action(struct slgt_info *info)
+{
+        unsigned long flags;
+        int rc;
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        if (info->pending_bh & BH_RECEIVE) {
+                info->pending_bh &= ~BH_RECEIVE;
+                rc = BH_RECEIVE;
+        } else if (info->pending_bh & BH_TRANSMIT) {
+                info->pending_bh &= ~BH_TRANSMIT;
+                rc = BH_TRANSMIT;
+        } else if (info->pending_bh & BH_STATUS) {
+                info->pending_bh &= ~BH_STATUS;
+                rc = BH_STATUS;
+        } else {
+                /* Mark BH routine as complete */
+                info->bh_running = false;
+                info->bh_requested = false;
+                rc = 0;
+        }
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        return rc;
+}
+
+/*
+ * perform bottom half processing
+ */
+static void bh_handler(struct work_struct *work)
+{
+        struct slgt_info *info = container_of(work, struct slgt_info, task);
+        int action;
+
+        if (!info)
+                return;
+        info->bh_running = true;
+
+        while((action = bh_action(info))) {
+                switch (action) {
+                case BH_RECEIVE:
+                        DBGBH(("%s bh receive\n", info->device_name));
+                        switch(info->params.mode) {
+                        case MGSL_MODE_ASYNC:
+                                rx_async(info);
+                                break;
+                        case MGSL_MODE_HDLC:
+                                while(rx_get_frame(info));
+                                break;
+                        case MGSL_MODE_RAW:
+                        case MGSL_MODE_MONOSYNC:
+                        case MGSL_MODE_BISYNC:
+                        case MGSL_MODE_XSYNC:
+                                while(rx_get_buf(info));
+                                break;
+                        }
+                        /* restart receiver if rx DMA buffers exhausted */
+                        if (info->rx_restart)
+                                rx_start(info);
+                        break;
+                case BH_TRANSMIT:
+                        bh_transmit(info);
+                        break;
+                case BH_STATUS:
+                        DBGBH(("%s bh status\n", info->device_name));
+                        info->ri_chkcount = 0;
+                        info->dsr_chkcount = 0;
+                        info->dcd_chkcount = 0;
+                        info->cts_chkcount = 0;
+                        break;
+                default:
+                        DBGBH(("%s unknown action\n", info->device_name));
+                        break;
+                }
+        }
+        DBGBH(("%s bh_handler exit\n", info->device_name));
+}
+
+static void bh_transmit(struct slgt_info *info)
+{
+        struct tty_struct *tty = info->port.tty;
+
+        DBGBH(("%s bh_transmit\n", info->device_name));
+        if (tty)
+                tty_wakeup(tty);
+}
+
+static void dsr_change(struct slgt_info *info, unsigned short status)
+{
+        if (status & BIT3) {
+                info->signals |= SerialSignal_DSR;
+                info->input_signal_events.dsr_up++;
+        } else {
+                info->signals &= ~SerialSignal_DSR;
+                info->input_signal_events.dsr_down++;
+        }
+        DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
+        if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
+                slgt_irq_off(info, IRQ_DSR);
+                return;
+        }
+        info->icount.dsr++;
+        wake_up_interruptible(&info->status_event_wait_q);
+        wake_up_interruptible(&info->event_wait_q);
+        info->pending_bh |= BH_STATUS;
+}
+
+static void cts_change(struct slgt_info *info, unsigned short status)
+{
+        if (status & BIT2) {
+                info->signals |= SerialSignal_CTS;
+                info->input_signal_events.cts_up++;
+        } else {
+                info->signals &= ~SerialSignal_CTS;
+                info->input_signal_events.cts_down++;
+        }
+        DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
+        if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
+                slgt_irq_off(info, IRQ_CTS);
+                return;
+        }
+        info->icount.cts++;
+        wake_up_interruptible(&info->status_event_wait_q);
+        wake_up_interruptible(&info->event_wait_q);
+        info->pending_bh |= BH_STATUS;
+
+        if (info->port.flags & ASYNC_CTS_FLOW) {
+                if (info->port.tty) {
+                        if (info->port.tty->hw_stopped) {
+                                if (info->signals & SerialSignal_CTS) {
+                                        info->port.tty->hw_stopped = 0;
+                                        info->pending_bh |= BH_TRANSMIT;
+                                        return;
+                                }
+                        } else {
+                                if (!(info->signals & SerialSignal_CTS))
+                                        info->port.tty->hw_stopped = 1;
+                        }
+                }
+        }
+}
+
+static void dcd_change(struct slgt_info *info, unsigned short status)
+{
+        if (status & BIT1) {
+                info->signals |= SerialSignal_DCD;
+                info->input_signal_events.dcd_up++;
+        } else {
+                info->signals &= ~SerialSignal_DCD;
+                info->input_signal_events.dcd_down++;
+        }
+        DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
+        if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
+                slgt_irq_off(info, IRQ_DCD);
+                return;
+        }
+        info->icount.dcd++;
+#if SYNCLINK_GENERIC_HDLC
+        if (info->netcount) {
+                if (info->signals & SerialSignal_DCD)
+                        netif_carrier_on(info->netdev);
+                else
+                        netif_carrier_off(info->netdev);
+        }
+#endif
+        wake_up_interruptible(&info->status_event_wait_q);
+        wake_up_interruptible(&info->event_wait_q);
+        info->pending_bh |= BH_STATUS;
+
+        if (info->port.flags & ASYNC_CHECK_CD) {
+                if (info->signals & SerialSignal_DCD)
+                        wake_up_interruptible(&info->port.open_wait);
+                else {
+                        if (info->port.tty)
+                                tty_hangup(info->port.tty);
+                }
+        }
+}
+
+static void ri_change(struct slgt_info *info, unsigned short status)
+{
+        if (status & BIT0) {
+                info->signals |= SerialSignal_RI;
+                info->input_signal_events.ri_up++;
+        } else {
+                info->signals &= ~SerialSignal_RI;
+                info->input_signal_events.ri_down++;
+        }
+        DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
+        if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
+                slgt_irq_off(info, IRQ_RI);
+                return;
+        }
+        info->icount.rng++;
+        wake_up_interruptible(&info->status_event_wait_q);
+        wake_up_interruptible(&info->event_wait_q);
+        info->pending_bh |= BH_STATUS;
+}
+
+static void isr_rxdata(struct slgt_info *info)
+{
+        unsigned int count = info->rbuf_fill_count;
+        unsigned int i = info->rbuf_fill_index;
+        unsigned short reg;
+
+        while (rd_reg16(info, SSR) & IRQ_RXDATA) {
+                reg = rd_reg16(info, RDR);
+                DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
+                if (desc_complete(info->rbufs[i])) {
+                        /* all buffers full */
+                        rx_stop(info);
+                        info->rx_restart = 1;
+                        continue;
+                }
+                info->rbufs[i].buf[count++] = (unsigned char)reg;
+                /* async mode saves status byte to buffer for each data byte */
+                if (info->params.mode == MGSL_MODE_ASYNC)
+                        info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
+                if (count == info->rbuf_fill_level || (reg & BIT10)) {
+                        /* buffer full or end of frame */
+                        set_desc_count(info->rbufs[i], count);
+                        set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
+                        info->rbuf_fill_count = count = 0;
+                        if (++i == info->rbuf_count)
+                                i = 0;
+                        info->pending_bh |= BH_RECEIVE;
+                }
+        }
+
+        info->rbuf_fill_index = i;
+        info->rbuf_fill_count = count;
+}
+
+static void isr_serial(struct slgt_info *info)
+{
+        unsigned short status = rd_reg16(info, SSR);
+
+        DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
+
+        wr_reg16(info, SSR, status); /* clear pending */
+
+        info->irq_occurred = true;
+
+        if (info->params.mode == MGSL_MODE_ASYNC) {
+                if (status & IRQ_TXIDLE) {
+                        if (info->tx_active)
+                                isr_txeom(info, status);
+                }
+                if (info->rx_pio && (status & IRQ_RXDATA))
+                        isr_rxdata(info);
+                if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
+                        info->icount.brk++;
+                        /* process break detection if tty control allows */
+                        if (info->port.tty) {
+                                if (!(status & info->ignore_status_mask)) {
+                                        if (info->read_status_mask & MASK_BREAK) {
+                                                tty_insert_flip_char(info->port.tty, 0, TTY_BREAK);
+                                                if (info->port.flags & ASYNC_SAK)
+                                                        do_SAK(info->port.tty);
+                                        }
+                                }
+                        }
+                }
+        } else {
+                if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
+                        isr_txeom(info, status);
+                if (info->rx_pio && (status & IRQ_RXDATA))
+                        isr_rxdata(info);
+                if (status & IRQ_RXIDLE) {
+                        if (status & RXIDLE)
+                                info->icount.rxidle++;
+                        else
+                                info->icount.exithunt++;
+                        wake_up_interruptible(&info->event_wait_q);
+                }
+
+                if (status & IRQ_RXOVER)
+                        rx_start(info);
+        }
+
+        if (status & IRQ_DSR)
+                dsr_change(info, status);
+        if (status & IRQ_CTS)
+                cts_change(info, status);
+        if (status & IRQ_DCD)
+                dcd_change(info, status);
+        if (status & IRQ_RI)
+                ri_change(info, status);
+}
+
+static void isr_rdma(struct slgt_info *info)
+{
+        unsigned int status = rd_reg32(info, RDCSR);
+
+        DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
+
+        /* RDCSR (rx DMA control/status)
+         *
+         * 31..07  reserved
+         * 06      save status byte to DMA buffer
+         * 05      error
+         * 04      eol (end of list)
+         * 03      eob (end of buffer)
+         * 02      IRQ enable
+         * 01      reset
+         * 00      enable
+         */
+        wr_reg32(info, RDCSR, status);  /* clear pending */
+
+        if (status & (BIT5 + BIT4)) {
+                DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
+                info->rx_restart = true;
+        }
+        info->pending_bh |= BH_RECEIVE;
+}
+
+static void isr_tdma(struct slgt_info *info)
+{
+        unsigned int status = rd_reg32(info, TDCSR);
+
+        DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
+
+        /* TDCSR (tx DMA control/status)
+         *
+         * 31..06  reserved
+         * 05      error
+         * 04      eol (end of list)
+         * 03      eob (end of buffer)
+         * 02      IRQ enable
+         * 01      reset
+         * 00      enable
+         */
+        wr_reg32(info, TDCSR, status);  /* clear pending */
+
+        if (status & (BIT5 + BIT4 + BIT3)) {
+                // another transmit buffer has completed
+                // run bottom half to get more send data from user
+                info->pending_bh |= BH_TRANSMIT;
+        }
+}
+
+/*
+ * return true if there are unsent tx DMA buffers, otherwise false
+ *
+ * if there are unsent buffers then info->tbuf_start
+ * is set to index of first unsent buffer
+ */
+static bool unsent_tbufs(struct slgt_info *info)
+{
+        unsigned int i = info->tbuf_current;
+        bool rc = false;
+
+        /*
+         * search backwards from last loaded buffer (precedes tbuf_current)
+         * for first unsent buffer (desc_count > 0)
+         */
+
+        do {
+                if (i)
+                        i--;
+                else
+                        i = info->tbuf_count - 1;
+                if (!desc_count(info->tbufs[i]))
+                        break;
+                info->tbuf_start = i;
+                rc = true;
+        } while (i != info->tbuf_current);
+
+        return rc;
+}
+
+static void isr_txeom(struct slgt_info *info, unsigned short status)
+{
+        DBGISR(("%s txeom status=%04x\n", info->device_name, status));
+
+        slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
+        tdma_reset(info);
+        if (status & IRQ_TXUNDER) {
+                unsigned short val = rd_reg16(info, TCR);
+                wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
+                wr_reg16(info, TCR, val); /* clear reset bit */
+        }
+
+        if (info->tx_active) {
+                if (info->params.mode != MGSL_MODE_ASYNC) {
+                        if (status & IRQ_TXUNDER)
+                                info->icount.txunder++;
+                        else if (status & IRQ_TXIDLE)
+                                info->icount.txok++;
+                }
+
+                if (unsent_tbufs(info)) {
+                        tx_start(info);
+                        update_tx_timer(info);
+                        return;
+                }
+                info->tx_active = false;
+
+                del_timer(&info->tx_timer);
+
+                if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
+                        info->signals &= ~SerialSignal_RTS;
+                        info->drop_rts_on_tx_done = false;
+                        set_signals(info);
+                }
+
+#if SYNCLINK_GENERIC_HDLC
+                if (info->netcount)
+                        hdlcdev_tx_done(info);
+                else
+#endif
+                {
+                        if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
+                                tx_stop(info);
+                                return;
+                        }
+                        info->pending_bh |= BH_TRANSMIT;
+                }
+        }
+}
+
+static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
+{
+        struct cond_wait *w, *prev;
+
+        /* wake processes waiting for specific transitions */
+        for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
+                if (w->data & changed) {
+                        w->data = state;
+                        wake_up_interruptible(&w->q);
+                        if (prev != NULL)
+                                prev->next = w->next;
+                        else
+                                info->gpio_wait_q = w->next;
+                } else
+                        prev = w;
+        }
+}
+
+/* interrupt service routine
+ *
+ *      irq     interrupt number
+ *      dev_id  device ID supplied during interrupt registration
+ */
+static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
+{
+        struct slgt_info *info = dev_id;
+        unsigned int gsr;
+        unsigned int i;
+
+        DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
+
+        while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
+                DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
+                info->irq_occurred = true;
+                for(i=0; i < info->port_count ; i++) {
+                        if (info->port_array[i] == NULL)
+                                continue;
+                        spin_lock(&info->port_array[i]->lock);
+                        if (gsr & (BIT8 << i))
+                                isr_serial(info->port_array[i]);
+                        if (gsr & (BIT16 << (i*2)))
+                                isr_rdma(info->port_array[i]);
+                        if (gsr & (BIT17 << (i*2)))
+                                isr_tdma(info->port_array[i]);
+                        spin_unlock(&info->port_array[i]->lock);
+                }
+        }
+
+        if (info->gpio_present) {
+                unsigned int state;
+                unsigned int changed;
+                spin_lock(&info->lock);
+                while ((changed = rd_reg32(info, IOSR)) != 0) {
+                        DBGISR(("%s iosr=%08x\n", info->device_name, changed));
+                        /* read latched state of GPIO signals */
+                        state = rd_reg32(info, IOVR);
+                        /* clear pending GPIO interrupt bits */
+                        wr_reg32(info, IOSR, changed);
+                        for (i=0 ; i < info->port_count ; i++) {
+                                if (info->port_array[i] != NULL)
+                                        isr_gpio(info->port_array[i], changed, state);
+                        }
+                }
+                spin_unlock(&info->lock);
+        }
+
+        for(i=0; i < info->port_count ; i++) {
+                struct slgt_info *port = info->port_array[i];
+                if (port == NULL)
+                        continue;
+                spin_lock(&port->lock);
+                if ((port->port.count || port->netcount) &&
+                    port->pending_bh && !port->bh_running &&
+                    !port->bh_requested) {
+                        DBGISR(("%s bh queued\n", port->device_name));
+                        schedule_work(&port->task);
+                        port->bh_requested = true;
+                }
+                spin_unlock(&port->lock);
+        }
+
+        DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
+        return IRQ_HANDLED;
+}
+
+static int startup(struct slgt_info *info)
+{
+        DBGINFO(("%s startup\n", info->device_name));
+
+        if (info->port.flags & ASYNC_INITIALIZED)
+                return 0;
+
+        if (!info->tx_buf) {
+                info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
+                if (!info->tx_buf) {
+                        DBGERR(("%s can't allocate tx buffer\n", info->device_name));
+                        return -ENOMEM;
+                }
+        }
+
+        info->pending_bh = 0;
+
+        memset(&info->icount, 0, sizeof(info->icount));
+
+        /* program hardware for current parameters */
+        change_params(info);
+
+        if (info->port.tty)
+                clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->port.flags |= ASYNC_INITIALIZED;
+
+        return 0;
+}
+
+/*
+ *  called by close() and hangup() to shutdown hardware
+ */
+static void shutdown(struct slgt_info *info)
+{
+        unsigned long flags;
+
+        if (!(info->port.flags & ASYNC_INITIALIZED))
+                return;
+
+        DBGINFO(("%s shutdown\n", info->device_name));
+
+        /* clear status wait queue because status changes */
+        /* can't happen after shutting down the hardware */
+        wake_up_interruptible(&info->status_event_wait_q);
+        wake_up_interruptible(&info->event_wait_q);
+
+        del_timer_sync(&info->tx_timer);
+        del_timer_sync(&info->rx_timer);
+
+        kfree(info->tx_buf);
+        info->tx_buf = NULL;
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        tx_stop(info);
+        rx_stop(info);
+
+        slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
+
+        if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
+                info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                set_signals(info);
+        }
+
+        flush_cond_wait(&info->gpio_wait_q);
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        if (info->port.tty)
+                set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->port.flags &= ~ASYNC_INITIALIZED;
+}
+
+static void program_hw(struct slgt_info *info)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        rx_stop(info);
+        tx_stop(info);
+
+        if (info->params.mode != MGSL_MODE_ASYNC ||
+            info->netcount)
+                sync_mode(info);
+        else
+                async_mode(info);
+
+        set_signals(info);
+
+        info->dcd_chkcount = 0;
+        info->cts_chkcount = 0;
+        info->ri_chkcount = 0;
+        info->dsr_chkcount = 0;
+
+        slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
+        get_signals(info);
+
+        if (info->netcount ||
+            (info->port.tty && info->port.tty->termios->c_cflag & CREAD))
+                rx_start(info);
+
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+/*
+ * reconfigure adapter based on new parameters
+ */
+static void change_params(struct slgt_info *info)
+{
+        unsigned cflag;
+        int bits_per_char;
+
+        if (!info->port.tty || !info->port.tty->termios)
+                return;
+        DBGINFO(("%s change_params\n", info->device_name));
+
+        cflag = info->port.tty->termios->c_cflag;
+
+        /* if B0 rate (hangup) specified then negate DTR and RTS */
+        /* otherwise assert DTR and RTS */
+        if (cflag & CBAUD)
+                info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+        else
+                info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+
+        /* byte size and parity */
+
+        switch (cflag & CSIZE) {
+        case CS5: info->params.data_bits = 5; break;
+        case CS6: info->params.data_bits = 6; break;
+        case CS7: info->params.data_bits = 7; break;
+        case CS8: info->params.data_bits = 8; break;
+        default:  info->params.data_bits = 7; break;
+        }
+
+        info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
+
+        if (cflag & PARENB)
+                info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
+        else
+                info->params.parity = ASYNC_PARITY_NONE;
+
+        /* calculate number of jiffies to transmit a full
+         * FIFO (32 bytes) at specified data rate
+         */
+        bits_per_char = info->params.data_bits +
+                        info->params.stop_bits + 1;
+
+        info->params.data_rate = tty_get_baud_rate(info->port.tty);
+
+        if (info->params.data_rate) {
+                info->timeout = (32*HZ*bits_per_char) /
+                                info->params.data_rate;
+        }
+        info->timeout += HZ/50;         /* Add .02 seconds of slop */
+
+        if (cflag & CRTSCTS)
+                info->port.flags |= ASYNC_CTS_FLOW;
+        else
+                info->port.flags &= ~ASYNC_CTS_FLOW;
+
+        if (cflag & CLOCAL)
+                info->port.flags &= ~ASYNC_CHECK_CD;
+        else
+                info->port.flags |= ASYNC_CHECK_CD;
+
+        /* process tty input control flags */
+
+        info->read_status_mask = IRQ_RXOVER;
+        if (I_INPCK(info->port.tty))
+                info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
+        if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
+                info->read_status_mask |= MASK_BREAK;
+        if (I_IGNPAR(info->port.tty))
+                info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
+        if (I_IGNBRK(info->port.tty)) {
+                info->ignore_status_mask |= MASK_BREAK;
+                /* If ignoring parity and break indicators, ignore
+                 * overruns too.  (For real raw support).
+                 */
+                if (I_IGNPAR(info->port.tty))
+                        info->ignore_status_mask |= MASK_OVERRUN;
+        }
+
+        program_hw(info);
+}
+
+static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
+{
+        DBGINFO(("%s get_stats\n",  info->device_name));
+        if (!user_icount) {
+                memset(&info->icount, 0, sizeof(info->icount));
+        } else {
+                if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
+                        return -EFAULT;
+        }
+        return 0;
+}
+
+static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
+{
+        DBGINFO(("%s get_params\n", info->device_name));
+        if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
+                return -EFAULT;
+        return 0;
+}
+
+static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
+{
+        unsigned long flags;
+        MGSL_PARAMS tmp_params;
+
+        DBGINFO(("%s set_params\n", info->device_name));
+        if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
+                return -EFAULT;
+
+        spin_lock_irqsave(&info->lock, flags);
+        if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
+                info->base_clock = tmp_params.clock_speed;
+        else
+                memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
+        spin_unlock_irqrestore(&info->lock, flags);
+
+        program_hw(info);
+
+        return 0;
+}
+
+static int get_txidle(struct slgt_info *info, int __user *idle_mode)
+{
+        DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
+        if (put_user(info->idle_mode, idle_mode))
+                return -EFAULT;
+        return 0;
+}
+
+static int set_txidle(struct slgt_info *info, int idle_mode)
+{
+        unsigned long flags;
+        DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
+        spin_lock_irqsave(&info->lock,flags);
+        info->idle_mode = idle_mode;
+        if (info->params.mode != MGSL_MODE_ASYNC)
+                tx_set_idle(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+static int tx_enable(struct slgt_info *info, int enable)
+{
+        unsigned long flags;
+        DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
+        spin_lock_irqsave(&info->lock,flags);
+        if (enable) {
+                if (!info->tx_enabled)
+                        tx_start(info);
+        } else {
+                if (info->tx_enabled)
+                        tx_stop(info);
+        }
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+/*
+ * abort transmit HDLC frame
+ */
+static int tx_abort(struct slgt_info *info)
+{
+        unsigned long flags;
+        DBGINFO(("%s tx_abort\n", info->device_name));
+        spin_lock_irqsave(&info->lock,flags);
+        tdma_reset(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+static int rx_enable(struct slgt_info *info, int enable)
+{
+        unsigned long flags;
+        unsigned int rbuf_fill_level;
+        DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
+        spin_lock_irqsave(&info->lock,flags);
+        /*
+         * enable[31..16] = receive DMA buffer fill level
+         * 0 = noop (leave fill level unchanged)
+         * fill level must be multiple of 4 and <= buffer size
+         */
+        rbuf_fill_level = ((unsigned int)enable) >> 16;
+        if (rbuf_fill_level) {
+                if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
+                        spin_unlock_irqrestore(&info->lock, flags);
+                        return -EINVAL;
+                }
+                info->rbuf_fill_level = rbuf_fill_level;
+                if (rbuf_fill_level < 128)
+                        info->rx_pio = 1; /* PIO mode */
+                else
+                        info->rx_pio = 0; /* DMA mode */
+                rx_stop(info); /* restart receiver to use new fill level */
+        }
+
+        /*
+         * enable[1..0] = receiver enable command
+         * 0 = disable
+         * 1 = enable
+         * 2 = enable or force hunt mode if already enabled
+         */
+        enable &= 3;
+        if (enable) {
+                if (!info->rx_enabled)
+                        rx_start(info);
+                else if (enable == 2) {
+                        /* force hunt mode (write 1 to RCR[3]) */
+                        wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
+                }
+        } else {
+                if (info->rx_enabled)
+                        rx_stop(info);
+        }
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+/*
+ *  wait for specified event to occur
+ */
+static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
+{
+        unsigned long flags;
+        int s;
+        int rc=0;
+        struct mgsl_icount cprev, cnow;
+        int events;
+        int mask;
+        struct  _input_signal_events oldsigs, newsigs;
+        DECLARE_WAITQUEUE(wait, current);
+
+        if (get_user(mask, mask_ptr))
+                return -EFAULT;
+
+        DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        /* return immediately if state matches requested events */
+        get_signals(info);
+        s = info->signals;
+
+        events = mask &
+                ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
+                  ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
+                  ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
+                  ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
+        if (events) {
+                spin_unlock_irqrestore(&info->lock,flags);
+                goto exit;
+        }
+
+        /* save current irq counts */
+        cprev = info->icount;
+        oldsigs = info->input_signal_events;
+
+        /* enable hunt and idle irqs if needed */
+        if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
+                unsigned short val = rd_reg16(info, SCR);
+                if (!(val & IRQ_RXIDLE))
+                        wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
+        }
+
+        set_current_state(TASK_INTERRUPTIBLE);
+        add_wait_queue(&info->event_wait_q, &wait);
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        for(;;) {
+                schedule();
+                if (signal_pending(current)) {
+                        rc = -ERESTARTSYS;
+                        break;
+                }
+
+                /* get current irq counts */
+                spin_lock_irqsave(&info->lock,flags);
+                cnow = info->icount;
+                newsigs = info->input_signal_events;
+                set_current_state(TASK_INTERRUPTIBLE);
+                spin_unlock_irqrestore(&info->lock,flags);
+
+                /* if no change, wait aborted for some reason */
+                if (newsigs.dsr_up   == oldsigs.dsr_up   &&
+                    newsigs.dsr_down == oldsigs.dsr_down &&
+                    newsigs.dcd_up   == oldsigs.dcd_up   &&
+                    newsigs.dcd_down == oldsigs.dcd_down &&
+                    newsigs.cts_up   == oldsigs.cts_up   &&
+                    newsigs.cts_down == oldsigs.cts_down &&
+                    newsigs.ri_up    == oldsigs.ri_up    &&
+                    newsigs.ri_down  == oldsigs.ri_down  &&
+                    cnow.exithunt    == cprev.exithunt   &&
+                    cnow.rxidle      == cprev.rxidle) {
+                        rc = -EIO;
+                        break;
+                }
+
+                events = mask &
+                        ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
+                          (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
+                          (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
+                          (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
+                          (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
+                          (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
+                          (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
+                          (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
+                          (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
+                          (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
+                if (events)
+                        break;
+
+                cprev = cnow;
+                oldsigs = newsigs;
+        }
+
+        remove_wait_queue(&info->event_wait_q, &wait);
+        set_current_state(TASK_RUNNING);
+
+
+        if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
+                spin_lock_irqsave(&info->lock,flags);
+                if (!waitqueue_active(&info->event_wait_q)) {
+                        /* disable enable exit hunt mode/idle rcvd IRQs */
+                        wr_reg16(info, SCR,
+                                (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
+                }
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+exit:
+        if (rc == 0)
+                rc = put_user(events, mask_ptr);
+        return rc;
+}
+
+static int get_interface(struct slgt_info *info, int __user *if_mode)
+{
+        DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
+        if (put_user(info->if_mode, if_mode))
+                return -EFAULT;
+        return 0;
+}
+
+static int set_interface(struct slgt_info *info, int if_mode)
+{
+        unsigned long flags;
+        unsigned short val;
+
+        DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
+        spin_lock_irqsave(&info->lock,flags);
+        info->if_mode = if_mode;
+
+        msc_set_vcr(info);
+
+        /* TCR (tx control) 07  1=RTS driver control */
+        val = rd_reg16(info, TCR);
+        if (info->if_mode & MGSL_INTERFACE_RTS_EN)
+                val |= BIT7;
+        else
+                val &= ~BIT7;
+        wr_reg16(info, TCR, val);
+
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+static int get_xsync(struct slgt_info *info, int __user *xsync)
+{
+        DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
+        if (put_user(info->xsync, xsync))
+                return -EFAULT;
+        return 0;
+}
+
+/*
+ * set extended sync pattern (1 to 4 bytes) for extended sync mode
+ *
+ * sync pattern is contained in least significant bytes of value
+ * most significant byte of sync pattern is oldest (1st sent/detected)
+ */
+static int set_xsync(struct slgt_info *info, int xsync)
+{
+        unsigned long flags;
+
+        DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
+        spin_lock_irqsave(&info->lock, flags);
+        info->xsync = xsync;
+        wr_reg32(info, XSR, xsync);
+        spin_unlock_irqrestore(&info->lock, flags);
+        return 0;
+}
+
+static int get_xctrl(struct slgt_info *info, int __user *xctrl)
+{
+        DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
+        if (put_user(info->xctrl, xctrl))
+                return -EFAULT;
+        return 0;
+}
+
+/*
+ * set extended control options
+ *
+ * xctrl[31:19] reserved, must be zero
+ * xctrl[18:17] extended sync pattern length in bytes
+ *              00 = 1 byte  in xsr[7:0]
+ *              01 = 2 bytes in xsr[15:0]
+ *              10 = 3 bytes in xsr[23:0]
+ *              11 = 4 bytes in xsr[31:0]
+ * xctrl[16]    1 = enable terminal count, 0=disabled
+ * xctrl[15:0]  receive terminal count for fixed length packets
+ *              value is count minus one (0 = 1 byte packet)
+ *              when terminal count is reached, receiver
+ *              automatically returns to hunt mode and receive
+ *              FIFO contents are flushed to DMA buffers with
+ *              end of frame (EOF) status
+ */
+static int set_xctrl(struct slgt_info *info, int xctrl)
+{
+        unsigned long flags;
+
+        DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
+        spin_lock_irqsave(&info->lock, flags);
+        info->xctrl = xctrl;
+        wr_reg32(info, XCR, xctrl);
+        spin_unlock_irqrestore(&info->lock, flags);
+        return 0;
+}
+
+/*
+ * set general purpose IO pin state and direction
+ *
+ * user_gpio fields:
+ * state   each bit indicates a pin state
+ * smask   set bit indicates pin state to set
+ * dir     each bit indicates a pin direction (0=input, 1=output)
+ * dmask   set bit indicates pin direction to set
+ */
+static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
+{
+        unsigned long flags;
+        struct gpio_desc gpio;
+        __u32 data;
+
+        if (!info->gpio_present)
+                return -EINVAL;
+        if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
+                return -EFAULT;
+        DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
+                 info->device_name, gpio.state, gpio.smask,
+                 gpio.dir, gpio.dmask));
+
+        spin_lock_irqsave(&info->port_array[0]->lock, flags);
+        if (gpio.dmask) {
+                data = rd_reg32(info, IODR);
+                data |= gpio.dmask & gpio.dir;
+                data &= ~(gpio.dmask & ~gpio.dir);
+                wr_reg32(info, IODR, data);
+        }
+        if (gpio.smask) {
+                data = rd_reg32(info, IOVR);
+                data |= gpio.smask & gpio.state;
+                data &= ~(gpio.smask & ~gpio.state);
+                wr_reg32(info, IOVR, data);
+        }
+        spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
+
+        return 0;
+}
+
+/*
+ * get general purpose IO pin state and direction
+ */
+static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
+{
+        struct gpio_desc gpio;
+        if (!info->gpio_present)
+                return -EINVAL;
+        gpio.state = rd_reg32(info, IOVR);
+        gpio.smask = 0xffffffff;
+        gpio.dir   = rd_reg32(info, IODR);
+        gpio.dmask = 0xffffffff;
+        if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
+                return -EFAULT;
+        DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
+                 info->device_name, gpio.state, gpio.dir));
+        return 0;
+}
+
+/*
+ * conditional wait facility
+ */
+static void init_cond_wait(struct cond_wait *w, unsigned int data)
+{
+        init_waitqueue_head(&w->q);
+        init_waitqueue_entry(&w->wait, current);
+        w->data = data;
+}
+
+static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
+{
+        set_current_state(TASK_INTERRUPTIBLE);
+        add_wait_queue(&w->q, &w->wait);
+        w->next = *head;
+        *head = w;
+}
+
+static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
+{
+        struct cond_wait *w, *prev;
+        remove_wait_queue(&cw->q, &cw->wait);
+        set_current_state(TASK_RUNNING);
+        for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
+                if (w == cw) {
+                        if (prev != NULL)
+                                prev->next = w->next;
+                        else
+                                *head = w->next;
+                        break;
+                }
+        }
+}
+
+static void flush_cond_wait(struct cond_wait **head)
+{
+        while (*head != NULL) {
+                wake_up_interruptible(&(*head)->q);
+                *head = (*head)->next;
+        }
+}
+
+/*
+ * wait for general purpose I/O pin(s) to enter specified state
+ *
+ * user_gpio fields:
+ * state - bit indicates target pin state
+ * smask - set bit indicates watched pin
+ *
+ * The wait ends when at least one watched pin enters the specified
+ * state. When 0 (no error) is returned, user_gpio->state is set to the
+ * state of all GPIO pins when the wait ends.
+ *
+ * Note: Each pin may be a dedicated input, dedicated output, or
+ * configurable input/output. The number and configuration of pins
+ * varies with the specific adapter model. Only input pins (dedicated
+ * or configured) can be monitored with this function.
+ */
+static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
+{
+        unsigned long flags;
+        int rc = 0;
+        struct gpio_desc gpio;
+        struct cond_wait wait;
+        u32 state;
+
+        if (!info->gpio_present)
+                return -EINVAL;
+        if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
+                return -EFAULT;
+        DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
+                 info->device_name, gpio.state, gpio.smask));
+        /* ignore output pins identified by set IODR bit */
+        if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
+                return -EINVAL;
+        init_cond_wait(&wait, gpio.smask);
+
+        spin_lock_irqsave(&info->port_array[0]->lock, flags);
+        /* enable interrupts for watched pins */
+        wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
+        /* get current pin states */
+        state = rd_reg32(info, IOVR);
+
+        if (gpio.smask & ~(state ^ gpio.state)) {
+                /* already in target state */
+                gpio.state = state;
+        } else {
+                /* wait for target state */
+                add_cond_wait(&info->gpio_wait_q, &wait);
+                spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
+                schedule();
+                if (signal_pending(current))
+                        rc = -ERESTARTSYS;
+                else
+                        gpio.state = wait.data;
+                spin_lock_irqsave(&info->port_array[0]->lock, flags);
+                remove_cond_wait(&info->gpio_wait_q, &wait);
+        }
+
+        /* disable all GPIO interrupts if no waiting processes */
+        if (info->gpio_wait_q == NULL)
+                wr_reg32(info, IOER, 0);
+        spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
+
+        if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
+                rc = -EFAULT;
+        return rc;
+}
+
+static int modem_input_wait(struct slgt_info *info,int arg)
+{
+        unsigned long flags;
+        int rc;
+        struct mgsl_icount cprev, cnow;
+        DECLARE_WAITQUEUE(wait, current);
+
+        /* save current irq counts */
+        spin_lock_irqsave(&info->lock,flags);
+        cprev = info->icount;
+        add_wait_queue(&info->status_event_wait_q, &wait);
+        set_current_state(TASK_INTERRUPTIBLE);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        for(;;) {
+                schedule();
+                if (signal_pending(current)) {
+                        rc = -ERESTARTSYS;
+                        break;
+                }
+
+                /* get new irq counts */
+                spin_lock_irqsave(&info->lock,flags);
+                cnow = info->icount;
+                set_current_state(TASK_INTERRUPTIBLE);
+                spin_unlock_irqrestore(&info->lock,flags);
+
+                /* if no change, wait aborted for some reason */
+                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
+                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
+                        rc = -EIO;
+                        break;
+                }
+
+                /* check for change in caller specified modem input */
+                if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
+                    (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
+                    (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
+                    (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
+                        rc = 0;
+                        break;
+                }
+
+                cprev = cnow;
+        }
+        remove_wait_queue(&info->status_event_wait_q, &wait);
+        set_current_state(TASK_RUNNING);
+        return rc;
+}
+
+/*
+ *  return state of serial control and status signals
+ */
+static int tiocmget(struct tty_struct *tty)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned int result;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
+                ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
+                ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
+                ((info->signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
+                ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
+                ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
+
+        DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
+        return result;
+}
+
+/*
+ * set modem control signals (DTR/RTS)
+ *
+ *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
+ *              TIOCMSET = set/clear signal values
+ *      value   bit mask for command
+ */
+static int tiocmset(struct tty_struct *tty,
+                    unsigned int set, unsigned int clear)
+{
+        struct slgt_info *info = tty->driver_data;
+        unsigned long flags;
+
+        DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
+
+        if (set & TIOCM_RTS)
+                info->signals |= SerialSignal_RTS;
+        if (set & TIOCM_DTR)
+                info->signals |= SerialSignal_DTR;
+        if (clear & TIOCM_RTS)
+                info->signals &= ~SerialSignal_RTS;
+        if (clear & TIOCM_DTR)
+                info->signals &= ~SerialSignal_DTR;
+
+        spin_lock_irqsave(&info->lock,flags);
+        set_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+static int carrier_raised(struct tty_port *port)
+{
+        unsigned long flags;
+        struct slgt_info *info = container_of(port, struct slgt_info, port);
+
+        spin_lock_irqsave(&info->lock,flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+        return (info->signals & SerialSignal_DCD) ? 1 : 0;
+}
+
+static void dtr_rts(struct tty_port *port, int on)
+{
+        unsigned long flags;
+        struct slgt_info *info = container_of(port, struct slgt_info, port);
+
+        spin_lock_irqsave(&info->lock,flags);
+        if (on)
+                info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+        else
+                info->signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+        set_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+
+/*
+ *  block current process until the device is ready to open
+ */
+static int block_til_ready(struct tty_struct *tty, struct file *filp,
+                           struct slgt_info *info)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        int             retval;
+        bool            do_clocal = false;
+        bool            extra_count = false;
+        unsigned long   flags;
+        int             cd;
+        struct tty_port *port = &info->port;
+
+        DBGINFO(("%s block_til_ready\n", tty->driver->name));
+
+        if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
+                /* nonblock mode is set or port is not enabled */
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (tty->termios->c_cflag & CLOCAL)
+                do_clocal = true;
+
+        /* Wait for carrier detect and the line to become
+         * free (i.e., not in use by the callout).  While we are in
+         * this loop, port->count is dropped by one, so that
+         * close() knows when to free things.  We restore it upon
+         * exit, either normal or abnormal.
+         */
+
+        retval = 0;
+        add_wait_queue(&port->open_wait, &wait);
+
+        spin_lock_irqsave(&info->lock, flags);
+        if (!tty_hung_up_p(filp)) {
+                extra_count = true;
+                port->count--;
+        }
+        spin_unlock_irqrestore(&info->lock, flags);
+        port->blocked_open++;
+
+        while (1) {
+                if ((tty->termios->c_cflag & CBAUD))
+                        tty_port_raise_dtr_rts(port);
+
+                set_current_state(TASK_INTERRUPTIBLE);
+
+                if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
+                        retval = (port->flags & ASYNC_HUP_NOTIFY) ?
+                                        -EAGAIN : -ERESTARTSYS;
+                        break;
+                }
+
+                cd = tty_port_carrier_raised(port);
+
+                if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
+                        break;
+
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+
+                DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+
+        set_current_state(TASK_RUNNING);
+        remove_wait_queue(&port->open_wait, &wait);
+
+        if (extra_count)
+                port->count++;
+        port->blocked_open--;
+
+        if (!retval)
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+
+        DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
+        return retval;
+}
+
+static int alloc_tmp_rbuf(struct slgt_info *info)
+{
+        info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
+        if (info->tmp_rbuf == NULL)
+                return -ENOMEM;
+        return 0;
+}
+
+static void free_tmp_rbuf(struct slgt_info *info)
+{
+        kfree(info->tmp_rbuf);
+        info->tmp_rbuf = NULL;
+}
+
+/*
+ * allocate DMA descriptor lists.
+ */
+static int alloc_desc(struct slgt_info *info)
+{
+        unsigned int i;
+        unsigned int pbufs;
+
+        /* allocate memory to hold descriptor lists */
+        info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
+        if (info->bufs == NULL)
+                return -ENOMEM;
+
+        memset(info->bufs, 0, DESC_LIST_SIZE);
+
+        info->rbufs = (struct slgt_desc*)info->bufs;
+        info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
+
+        pbufs = (unsigned int)info->bufs_dma_addr;
+
+        /*
+         * Build circular lists of descriptors
+         */
+
+        for (i=0; i < info->rbuf_count; i++) {
+                /* physical address of this descriptor */
+                info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
+
+                /* physical address of next descriptor */
+                if (i == info->rbuf_count - 1)
+                        info->rbufs[i].next = cpu_to_le32(pbufs);
+                else
+                        info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
+                set_desc_count(info->rbufs[i], DMABUFSIZE);
+        }
+
+        for (i=0; i < info->tbuf_count; i++) {
+                /* physical address of this descriptor */
+                info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
+
+                /* physical address of next descriptor */
+                if (i == info->tbuf_count - 1)
+                        info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
+                else
+                        info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
+        }
+
+        return 0;
+}
+
+static void free_desc(struct slgt_info *info)
+{
+        if (info->bufs != NULL) {
+                pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
+                info->bufs  = NULL;
+                info->rbufs = NULL;
+                info->tbufs = NULL;
+        }
+}
+
+static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
+{
+        int i;
+        for (i=0; i < count; i++) {
+                if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
+                        return -ENOMEM;
+                bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
+        }
+        return 0;
+}
+
+static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
+{
+        int i;
+        for (i=0; i < count; i++) {
+                if (bufs[i].buf == NULL)
+                        continue;
+                pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
+                bufs[i].buf = NULL;
+        }
+}
+
+static int alloc_dma_bufs(struct slgt_info *info)
+{
+        info->rbuf_count = 32;
+        info->tbuf_count = 32;
+
+        if (alloc_desc(info) < 0 ||
+            alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
+            alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
+            alloc_tmp_rbuf(info) < 0) {
+                DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
+                return -ENOMEM;
+        }
+        reset_rbufs(info);
+        return 0;
+}
+
+static void free_dma_bufs(struct slgt_info *info)
+{
+        if (info->bufs) {
+                free_bufs(info, info->rbufs, info->rbuf_count);
+                free_bufs(info, info->tbufs, info->tbuf_count);
+                free_desc(info);
+        }
+        free_tmp_rbuf(info);
+}
+
+static int claim_resources(struct slgt_info *info)
+{
+        if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
+                DBGERR(("%s reg addr conflict, addr=%08X\n",
+                        info->device_name, info->phys_reg_addr));
+                info->init_error = DiagStatus_AddressConflict;
+                goto errout;
+        }
+        else
+                info->reg_addr_requested = true;
+
+        info->reg_addr = ioremap_nocache(info->phys_reg_addr, SLGT_REG_SIZE);
+        if (!info->reg_addr) {
+                DBGERR(("%s can't map device registers, addr=%08X\n",
+                        info->device_name, info->phys_reg_addr));
+                info->init_error = DiagStatus_CantAssignPciResources;
+                goto errout;
+        }
+        return 0;
+
+errout:
+        release_resources(info);
+        return -ENODEV;
+}
+
+static void release_resources(struct slgt_info *info)
+{
+        if (info->irq_requested) {
+                free_irq(info->irq_level, info);
+                info->irq_requested = false;
+        }
+
+        if (info->reg_addr_requested) {
+                release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
+                info->reg_addr_requested = false;
+        }
+
+        if (info->reg_addr) {
+                iounmap(info->reg_addr);
+                info->reg_addr = NULL;
+        }
+}
+
+/* Add the specified device instance data structure to the
+ * global linked list of devices and increment the device count.
+ */
+static void add_device(struct slgt_info *info)
+{
+        char *devstr;
+
+        info->next_device = NULL;
+        info->line = slgt_device_count;
+        sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
+
+        if (info->line < MAX_DEVICES) {
+                if (maxframe[info->line])
+                        info->max_frame_size = maxframe[info->line];
+        }
+
+        slgt_device_count++;
+
+        if (!slgt_device_list)
+                slgt_device_list = info;
+        else {
+                struct slgt_info *current_dev = slgt_device_list;
+                while(current_dev->next_device)
+                        current_dev = current_dev->next_device;
+                current_dev->next_device = info;
+        }
+
+        if (info->max_frame_size < 4096)
+                info->max_frame_size = 4096;
+        else if (info->max_frame_size > 65535)
+                info->max_frame_size = 65535;
+
+        switch(info->pdev->device) {
+        case SYNCLINK_GT_DEVICE_ID:
+                devstr = "GT";
+                break;
+        case SYNCLINK_GT2_DEVICE_ID:
+                devstr = "GT2";
+                break;
+        case SYNCLINK_GT4_DEVICE_ID:
+                devstr = "GT4";
+                break;
+        case SYNCLINK_AC_DEVICE_ID:
+                devstr = "AC";
+                info->params.mode = MGSL_MODE_ASYNC;
+                break;
+        default:
+                devstr = "(unknown model)";
+        }
+        printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
+                devstr, info->device_name, info->phys_reg_addr,
+                info->irq_level, info->max_frame_size);
+
+#if SYNCLINK_GENERIC_HDLC
+        hdlcdev_init(info);
+#endif
+}
+
+static const struct tty_port_operations slgt_port_ops = {
+        .carrier_raised = carrier_raised,
+        .dtr_rts = dtr_rts,
+};
+
+/*
+ *  allocate device instance structure, return NULL on failure
+ */
+static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
+{
+        struct slgt_info *info;
+
+        info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
+
+        if (!info) {
+                DBGERR(("%s device alloc failed adapter=%d port=%d\n",
+                        driver_name, adapter_num, port_num));
+        } else {
+                tty_port_init(&info->port);
+                info->port.ops = &slgt_port_ops;
+                info->magic = MGSL_MAGIC;
+                INIT_WORK(&info->task, bh_handler);
+                info->max_frame_size = 4096;
+                info->base_clock = 14745600;
+                info->rbuf_fill_level = DMABUFSIZE;
+                info->port.close_delay = 5*HZ/10;
+                info->port.closing_wait = 30*HZ;
+                init_waitqueue_head(&info->status_event_wait_q);
+                init_waitqueue_head(&info->event_wait_q);
+                spin_lock_init(&info->netlock);
+                memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
+                info->idle_mode = HDLC_TXIDLE_FLAGS;
+                info->adapter_num = adapter_num;
+                info->port_num = port_num;
+
+                setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
+                setup_timer(&info->rx_timer, rx_timeout, (unsigned long)info);
+
+                /* Copy configuration info to device instance data */
+                info->pdev = pdev;
+                info->irq_level = pdev->irq;
+                info->phys_reg_addr = pci_resource_start(pdev,0);
+
+                info->bus_type = MGSL_BUS_TYPE_PCI;
+                info->irq_flags = IRQF_SHARED;
+
+                info->init_error = -1; /* assume error, set to 0 on successful init */
+        }
+
+        return info;
+}
+
+static void device_init(int adapter_num, struct pci_dev *pdev)
+{
+        struct slgt_info *port_array[SLGT_MAX_PORTS];
+        int i;
+        int port_count = 1;
+
+        if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
+                port_count = 2;
+        else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
+                port_count = 4;
+
+        /* allocate device instances for all ports */
+        for (i=0; i < port_count; ++i) {
+                port_array[i] = alloc_dev(adapter_num, i, pdev);
+                if (port_array[i] == NULL) {
+                        for (--i; i >= 0; --i)
+                                kfree(port_array[i]);
+                        return;
+                }
+        }
+
+        /* give copy of port_array to all ports and add to device list  */
+        for (i=0; i < port_count; ++i) {
+                memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
+                add_device(port_array[i]);
+                port_array[i]->port_count = port_count;
+                spin_lock_init(&port_array[i]->lock);
+        }
+
+        /* Allocate and claim adapter resources */
+        if (!claim_resources(port_array[0])) {
+
+                alloc_dma_bufs(port_array[0]);
+
+                /* copy resource information from first port to others */
+                for (i = 1; i < port_count; ++i) {
+                        port_array[i]->irq_level = port_array[0]->irq_level;
+                        port_array[i]->reg_addr  = port_array[0]->reg_addr;
+                        alloc_dma_bufs(port_array[i]);
+                }
+
+                if (request_irq(port_array[0]->irq_level,
+                                        slgt_interrupt,
+                                        port_array[0]->irq_flags,
+                                        port_array[0]->device_name,
+                                        port_array[0]) < 0) {
+                        DBGERR(("%s request_irq failed IRQ=%d\n",
+                                port_array[0]->device_name,
+                                port_array[0]->irq_level));
+                } else {
+                        port_array[0]->irq_requested = true;
+                        adapter_test(port_array[0]);
+                        for (i=1 ; i < port_count ; i++) {
+                                port_array[i]->init_error = port_array[0]->init_error;
+                                port_array[i]->gpio_present = port_array[0]->gpio_present;
+                        }
+                }
+        }
+
+        for (i=0; i < port_count; ++i)
+                tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
+}
+
+static int __devinit init_one(struct pci_dev *dev,
+                              const struct pci_device_id *ent)
+{
+        if (pci_enable_device(dev)) {
+                printk("error enabling pci device %p\n", dev);
+                return -EIO;
+        }
+        pci_set_master(dev);
+        device_init(slgt_device_count, dev);
+        return 0;
+}
+
+static void __devexit remove_one(struct pci_dev *dev)
+{
+}
+
+static const struct tty_operations ops = {
+        .open = open,
+        .close = close,
+        .write = write,
+        .put_char = put_char,
+        .flush_chars = flush_chars,
+        .write_room = write_room,
+        .chars_in_buffer = chars_in_buffer,
+        .flush_buffer = flush_buffer,
+        .ioctl = ioctl,
+        .compat_ioctl = slgt_compat_ioctl,
+        .throttle = throttle,
+        .unthrottle = unthrottle,
+        .send_xchar = send_xchar,
+        .break_ctl = set_break,
+        .wait_until_sent = wait_until_sent,
+        .set_termios = set_termios,
+        .stop = tx_hold,
+        .start = tx_release,
+        .hangup = hangup,
+        .tiocmget = tiocmget,
+        .tiocmset = tiocmset,
+        .get_icount = get_icount,
+        .proc_fops = &synclink_gt_proc_fops,
+};
+
+static void slgt_cleanup(void)
+{
+        int rc;
+        struct slgt_info *info;
+        struct slgt_info *tmp;
+
+        printk(KERN_INFO "unload %s\n", driver_name);
+
+        if (serial_driver) {
+                for (info=slgt_device_list ; info != NULL ; info=info->next_device)
+                        tty_unregister_device(serial_driver, info->line);
+                if ((rc = tty_unregister_driver(serial_driver)))
+                        DBGERR(("tty_unregister_driver error=%d\n", rc));
+                put_tty_driver(serial_driver);
+        }
+
+        /* reset devices */
+        info = slgt_device_list;
+        while(info) {
+                reset_port(info);
+                info = info->next_device;
+        }
+
+        /* release devices */
+        info = slgt_device_list;
+        while(info) {
+#if SYNCLINK_GENERIC_HDLC
+                hdlcdev_exit(info);
+#endif
+                free_dma_bufs(info);
+                free_tmp_rbuf(info);
+                if (info->port_num == 0)
+                        release_resources(info);
+                tmp = info;
+                info = info->next_device;
+                kfree(tmp);
+        }
+
+        if (pci_registered)
+                pci_unregister_driver(&pci_driver);
+}
+
+/*
+ *  Driver initialization entry point.
+ */
+static int __init slgt_init(void)
+{
+        int rc;
+
+        printk(KERN_INFO "%s\n", driver_name);
+
+        serial_driver = alloc_tty_driver(MAX_DEVICES);
+        if (!serial_driver) {
+                printk("%s can't allocate tty driver\n", driver_name);
+                return -ENOMEM;
+        }
+
+        /* Initialize the tty_driver structure */
+
+        serial_driver->owner = THIS_MODULE;
+        serial_driver->driver_name = tty_driver_name;
+        serial_driver->name = tty_dev_prefix;
+        serial_driver->major = ttymajor;
+        serial_driver->minor_start = 64;
+        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        serial_driver->subtype = SERIAL_TYPE_NORMAL;
+        serial_driver->init_termios = tty_std_termios;
+        serial_driver->init_termios.c_cflag =
+                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        serial_driver->init_termios.c_ispeed = 9600;
+        serial_driver->init_termios.c_ospeed = 9600;
+        serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        tty_set_operations(serial_driver, &ops);
+        if ((rc = tty_register_driver(serial_driver)) < 0) {
+                DBGERR(("%s can't register serial driver\n", driver_name));
+                put_tty_driver(serial_driver);
+                serial_driver = NULL;
+                goto error;
+        }
+
+        printk(KERN_INFO "%s, tty major#%d\n",
+               driver_name, serial_driver->major);
+
+        slgt_device_count = 0;
+        if ((rc = pci_register_driver(&pci_driver)) < 0) {
+                printk("%s pci_register_driver error=%d\n", driver_name, rc);
+                goto error;
+        }
+        pci_registered = true;
+
+        if (!slgt_device_list)
+                printk("%s no devices found\n",driver_name);
+
+        return 0;
+
+error:
+        slgt_cleanup();
+        return rc;
+}
+
+static void __exit slgt_exit(void)
+{
+        slgt_cleanup();
+}
+
+module_init(slgt_init);
+module_exit(slgt_exit);
+
+/*
+ * register access routines
+ */
+
+#define CALC_REGADDR() \
+        unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
+        if (addr >= 0x80) \
+                reg_addr += (info->port_num) * 32; \
+        else if (addr >= 0x40)  \
+                reg_addr += (info->port_num) * 16;
+
+static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
+{
+        CALC_REGADDR();
+        return readb((void __iomem *)reg_addr);
+}
+
+static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
+{
+        CALC_REGADDR();
+        writeb(value, (void __iomem *)reg_addr);
+}
+
+static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
+{
+        CALC_REGADDR();
+        return readw((void __iomem *)reg_addr);
+}
+
+static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
+{
+        CALC_REGADDR();
+        writew(value, (void __iomem *)reg_addr);
+}
+
+static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
+{
+        CALC_REGADDR();
+        return readl((void __iomem *)reg_addr);
+}
+
+static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
+{
+        CALC_REGADDR();
+        writel(value, (void __iomem *)reg_addr);
+}
+
+static void rdma_reset(struct slgt_info *info)
+{
+        unsigned int i;
+
+        /* set reset bit */
+        wr_reg32(info, RDCSR, BIT1);
+
+        /* wait for enable bit cleared */
+        for(i=0 ; i < 1000 ; i++)
+                if (!(rd_reg32(info, RDCSR) & BIT0))
+                        break;
+}
+
+static void tdma_reset(struct slgt_info *info)
+{
+        unsigned int i;
+
+        /* set reset bit */
+        wr_reg32(info, TDCSR, BIT1);
+
+        /* wait for enable bit cleared */
+        for(i=0 ; i < 1000 ; i++)
+                if (!(rd_reg32(info, TDCSR) & BIT0))
+                        break;
+}
+
+/*
+ * enable internal loopback
+ * TxCLK and RxCLK are generated from BRG
+ * and TxD is looped back to RxD internally.
+ */
+static void enable_loopback(struct slgt_info *info)
+{
+        /* SCR (serial control) BIT2=looopback enable */
+        wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
+
+        if (info->params.mode != MGSL_MODE_ASYNC) {
+                /* CCR (clock control)
+                 * 07..05  tx clock source (010 = BRG)
+                 * 04..02  rx clock source (010 = BRG)
+                 * 01      auxclk enable   (0 = disable)
+                 * 00      BRG enable      (1 = enable)
+                 *
+                 * 0100 1001
+                 */
+                wr_reg8(info, CCR, 0x49);
+
+                /* set speed if available, otherwise use default */
+                if (info->params.clock_speed)
+                        set_rate(info, info->params.clock_speed);
+                else
+                        set_rate(info, 3686400);
+        }
+}
+
+/*
+ *  set baud rate generator to specified rate
+ */
+static void set_rate(struct slgt_info *info, u32 rate)
+{
+        unsigned int div;
+        unsigned int osc = info->base_clock;
+
+        /* div = osc/rate - 1
+         *
+         * Round div up if osc/rate is not integer to
+         * force to next slowest rate.
+         */
+
+        if (rate) {
+                div = osc/rate;
+                if (!(osc % rate) && div)
+                        div--;
+                wr_reg16(info, BDR, (unsigned short)div);
+        }
+}
+
+static void rx_stop(struct slgt_info *info)
+{
+        unsigned short val;
+
+        /* disable and reset receiver */
+        val = rd_reg16(info, RCR) & ~BIT1;          /* clear enable bit */
+        wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
+        wr_reg16(info, RCR, val);                  /* clear reset bit */
+
+        slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
+
+        /* clear pending rx interrupts */
+        wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
+
+        rdma_reset(info);
+
+        info->rx_enabled = false;
+        info->rx_restart = false;
+}
+
+static void rx_start(struct slgt_info *info)
+{
+        unsigned short val;
+
+        slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
+
+        /* clear pending rx overrun IRQ */
+        wr_reg16(info, SSR, IRQ_RXOVER);
+
+        /* reset and disable receiver */
+        val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
+        wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
+        wr_reg16(info, RCR, val);                  /* clear reset bit */
+
+        rdma_reset(info);
+        reset_rbufs(info);
+
+        if (info->rx_pio) {
+                /* rx request when rx FIFO not empty */
+                wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
+                slgt_irq_on(info, IRQ_RXDATA);
+                if (info->params.mode == MGSL_MODE_ASYNC) {
+                        /* enable saving of rx status */
+                        wr_reg32(info, RDCSR, BIT6);
+                }
+        } else {
+                /* rx request when rx FIFO half full */
+                wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
+                /* set 1st descriptor address */
+                wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
+
+                if (info->params.mode != MGSL_MODE_ASYNC) {
+                        /* enable rx DMA and DMA interrupt */
+                        wr_reg32(info, RDCSR, (BIT2 + BIT0));
+                } else {
+                        /* enable saving of rx status, rx DMA and DMA interrupt */
+                        wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
+                }
+        }
+
+        slgt_irq_on(info, IRQ_RXOVER);
+
+        /* enable receiver */
+        wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
+
+        info->rx_restart = false;
+        info->rx_enabled = true;
+}
+
+static void tx_start(struct slgt_info *info)
+{
+        if (!info->tx_enabled) {
+                wr_reg16(info, TCR,
+                         (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
+                info->tx_enabled = true;
+        }
+
+        if (desc_count(info->tbufs[info->tbuf_start])) {
+                info->drop_rts_on_tx_done = false;
+
+                if (info->params.mode != MGSL_MODE_ASYNC) {
+                        if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
+                                get_signals(info);
+                                if (!(info->signals & SerialSignal_RTS)) {
+                                        info->signals |= SerialSignal_RTS;
+                                        set_signals(info);
+                                        info->drop_rts_on_tx_done = true;
+                                }
+                        }
+
+                        slgt_irq_off(info, IRQ_TXDATA);
+                        slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
+                        /* clear tx idle and underrun status bits */
+                        wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
+                } else {
+                        slgt_irq_off(info, IRQ_TXDATA);
+                        slgt_irq_on(info, IRQ_TXIDLE);
+                        /* clear tx idle status bit */
+                        wr_reg16(info, SSR, IRQ_TXIDLE);
+                }
+                /* set 1st descriptor address and start DMA */
+                wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
+                wr_reg32(info, TDCSR, BIT2 + BIT0);
+                info->tx_active = true;
+        }
+}
+
+static void tx_stop(struct slgt_info *info)
+{
+        unsigned short val;
+
+        del_timer(&info->tx_timer);
+
+        tdma_reset(info);
+
+        /* reset and disable transmitter */
+        val = rd_reg16(info, TCR) & ~BIT1;          /* clear enable bit */
+        wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
+
+        slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
+
+        /* clear tx idle and underrun status bit */
+        wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
+
+        reset_tbufs(info);
+
+        info->tx_enabled = false;
+        info->tx_active = false;
+}
+
+static void reset_port(struct slgt_info *info)
+{
+        if (!info->reg_addr)
+                return;
+
+        tx_stop(info);
+        rx_stop(info);
+
+        info->signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+        set_signals(info);
+
+        slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
+}
+
+static void reset_adapter(struct slgt_info *info)
+{
+        int i;
+        for (i=0; i < info->port_count; ++i) {
+                if (info->port_array[i])
+                        reset_port(info->port_array[i]);
+        }
+}
+
+static void async_mode(struct slgt_info *info)
+{
+        unsigned short val;
+
+        slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
+        tx_stop(info);
+        rx_stop(info);
+
+        /* TCR (tx control)
+         *
+         * 15..13  mode, 010=async
+         * 12..10  encoding, 000=NRZ
+         * 09      parity enable
+         * 08      1=odd parity, 0=even parity
+         * 07      1=RTS driver control
+         * 06      1=break enable
+         * 05..04  character length
+         *         00=5 bits
+         *         01=6 bits
+         *         10=7 bits
+         *         11=8 bits
+         * 03      0=1 stop bit, 1=2 stop bits
+         * 02      reset
+         * 01      enable
+         * 00      auto-CTS enable
+         */
+        val = 0x4000;
+
+        if (info->if_mode & MGSL_INTERFACE_RTS_EN)
+                val |= BIT7;
+
+        if (info->params.parity != ASYNC_PARITY_NONE) {
+                val |= BIT9;
+                if (info->params.parity == ASYNC_PARITY_ODD)
+                        val |= BIT8;
+        }
+
+        switch (info->params.data_bits)
+        {
+        case 6: val |= BIT4; break;
+        case 7: val |= BIT5; break;
+        case 8: val |= BIT5 + BIT4; break;
+        }
+
+        if (info->params.stop_bits != 1)
+                val |= BIT3;
+
+        if (info->params.flags & HDLC_FLAG_AUTO_CTS)
+                val |= BIT0;
+
+        wr_reg16(info, TCR, val);
+
+        /* RCR (rx control)
+         *
+         * 15..13  mode, 010=async
+         * 12..10  encoding, 000=NRZ
+         * 09      parity enable
+         * 08      1=odd parity, 0=even parity
+         * 07..06  reserved, must be 0
+         * 05..04  character length
+         *         00=5 bits
+         *         01=6 bits
+         *         10=7 bits
+         *         11=8 bits
+         * 03      reserved, must be zero
+         * 02      reset
+         * 01      enable
+         * 00      auto-DCD enable
+         */
+        val = 0x4000;
+
+        if (info->params.parity != ASYNC_PARITY_NONE) {
+                val |= BIT9;
+                if (info->params.parity == ASYNC_PARITY_ODD)
+                        val |= BIT8;
+        }
+
+        switch (info->params.data_bits)
+        {
+        case 6: val |= BIT4; break;
+        case 7: val |= BIT5; break;
+        case 8: val |= BIT5 + BIT4; break;
+        }
+
+        if (info->params.flags & HDLC_FLAG_AUTO_DCD)
+                val |= BIT0;
+
+        wr_reg16(info, RCR, val);
+
+        /* CCR (clock control)
+         *
+         * 07..05  011 = tx clock source is BRG/16
+         * 04..02  010 = rx clock source is BRG
+         * 01      0 = auxclk disabled
+         * 00      1 = BRG enabled
+         *
+         * 0110 1001
+         */
+        wr_reg8(info, CCR, 0x69);
+
+        msc_set_vcr(info);
+
+        /* SCR (serial control)
+         *
+         * 15  1=tx req on FIFO half empty
+         * 14  1=rx req on FIFO half full
+         * 13  tx data  IRQ enable
+         * 12  tx idle  IRQ enable
+         * 11  rx break on IRQ enable
+         * 10  rx data  IRQ enable
+         * 09  rx break off IRQ enable
+         * 08  overrun  IRQ enable
+         * 07  DSR      IRQ enable
+         * 06  CTS      IRQ enable
+         * 05  DCD      IRQ enable
+         * 04  RI       IRQ enable
+         * 03  0=16x sampling, 1=8x sampling
+         * 02  1=txd->rxd internal loopback enable
+         * 01  reserved, must be zero
+         * 00  1=master IRQ enable
+         */
+        val = BIT15 + BIT14 + BIT0;
+        /* JCR[8] : 1 = x8 async mode feature available */
+        if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
+            ((info->base_clock < (info->params.data_rate * 16)) ||
+             (info->base_clock % (info->params.data_rate * 16)))) {
+                /* use 8x sampling */
+                val |= BIT3;
+                set_rate(info, info->params.data_rate * 8);
+        } else {
+                /* use 16x sampling */
+                set_rate(info, info->params.data_rate * 16);
+        }
+        wr_reg16(info, SCR, val);
+
+        slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
+
+        if (info->params.loopback)
+                enable_loopback(info);
+}
+
+static void sync_mode(struct slgt_info *info)
+{
+        unsigned short val;
+
+        slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
+        tx_stop(info);
+        rx_stop(info);
+
+        /* TCR (tx control)
+         *
+         * 15..13  mode
+         *         000=HDLC/SDLC
+         *         001=raw bit synchronous
+         *         010=asynchronous/isochronous
+         *         011=monosync byte synchronous
+         *         100=bisync byte synchronous
+         *         101=xsync byte synchronous
+         * 12..10  encoding
+         * 09      CRC enable
+         * 08      CRC32
+         * 07      1=RTS driver control
+         * 06      preamble enable
+         * 05..04  preamble length
+         * 03      share open/close flag
+         * 02      reset
+         * 01      enable
+         * 00      auto-CTS enable
+         */
+        val = BIT2;
+
+        switch(info->params.mode) {
+        case MGSL_MODE_XSYNC:
+                val |= BIT15 + BIT13;
+                break;
+        case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
+        case MGSL_MODE_BISYNC:   val |= BIT15; break;
+        case MGSL_MODE_RAW:      val |= BIT13; break;
+        }
+        if (info->if_mode & MGSL_INTERFACE_RTS_EN)
+                val |= BIT7;
+
+        switch(info->params.encoding)
+        {
+        case HDLC_ENCODING_NRZB:          val |= BIT10; break;
+        case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
+        case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
+        case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
+        case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
+        case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
+        case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
+        }
+
+        switch (info->params.crc_type & HDLC_CRC_MASK)
+        {
+        case HDLC_CRC_16_CCITT: val |= BIT9; break;
+        case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
+        }
+
+        if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
+                val |= BIT6;
+
+        switch (info->params.preamble_length)
+        {
+        case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
+        case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
+        case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
+        }
+
+        if (info->params.flags & HDLC_FLAG_AUTO_CTS)
+                val |= BIT0;
+
+        wr_reg16(info, TCR, val);
+
+        /* TPR (transmit preamble) */
+
+        switch (info->params.preamble)
+        {
+        case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
+        case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
+        case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
+        case HDLC_PREAMBLE_PATTERN_10:    val = 0x55; break;
+        case HDLC_PREAMBLE_PATTERN_01:    val = 0xaa; break;
+        default:                          val = 0x7e; break;
+        }
+        wr_reg8(info, TPR, (unsigned char)val);
+
+        /* RCR (rx control)
+         *
+         * 15..13  mode
+         *         000=HDLC/SDLC
+         *         001=raw bit synchronous
+         *         010=asynchronous/isochronous
+         *         011=monosync byte synchronous
+         *         100=bisync byte synchronous
+         *         101=xsync byte synchronous
+         * 12..10  encoding
+         * 09      CRC enable
+         * 08      CRC32
+         * 07..03  reserved, must be 0
+         * 02      reset
+         * 01      enable
+         * 00      auto-DCD enable
+         */
+        val = 0;
+
+        switch(info->params.mode) {
+        case MGSL_MODE_XSYNC:
+                val |= BIT15 + BIT13;
+                break;
+        case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
+        case MGSL_MODE_BISYNC:   val |= BIT15; break;
+        case MGSL_MODE_RAW:      val |= BIT13; break;
+        }
+
+        switch(info->params.encoding)
+        {
+        case HDLC_ENCODING_NRZB:          val |= BIT10; break;
+        case HDLC_ENCODING_NRZI_MARK:     val |= BIT11; break;
+        case HDLC_ENCODING_NRZI:          val |= BIT11 + BIT10; break;
+        case HDLC_ENCODING_BIPHASE_MARK:  val |= BIT12; break;
+        case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
+        case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
+        case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
+        }
+
+        switch (info->params.crc_type & HDLC_CRC_MASK)
+        {
+        case HDLC_CRC_16_CCITT: val |= BIT9; break;
+        case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
+        }
+
+        if (info->params.flags & HDLC_FLAG_AUTO_DCD)
+                val |= BIT0;
+
+        wr_reg16(info, RCR, val);
+
+        /* CCR (clock control)
+         *
+         * 07..05  tx clock source
+         * 04..02  rx clock source
+         * 01      auxclk enable
+         * 00      BRG enable
+         */
+        val = 0;
+
+        if (info->params.flags & HDLC_FLAG_TXC_BRG)
+        {
+                // when RxC source is DPLL, BRG generates 16X DPLL
+                // reference clock, so take TxC from BRG/16 to get
+                // transmit clock at actual data rate
+                if (info->params.flags & HDLC_FLAG_RXC_DPLL)
+                        val |= BIT6 + BIT5;     /* 011, txclk = BRG/16 */
+                else
+                        val |= BIT6;    /* 010, txclk = BRG */
+        }
+        else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
+                val |= BIT7;    /* 100, txclk = DPLL Input */
+        else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
+                val |= BIT5;    /* 001, txclk = RXC Input */
+
+        if (info->params.flags & HDLC_FLAG_RXC_BRG)
+                val |= BIT3;    /* 010, rxclk = BRG */
+        else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
+                val |= BIT4;    /* 100, rxclk = DPLL */
+        else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
+                val |= BIT2;    /* 001, rxclk = TXC Input */
+
+        if (info->params.clock_speed)
+                val |= BIT1 + BIT0;
+
+        wr_reg8(info, CCR, (unsigned char)val);
+
+        if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
+        {
+                // program DPLL mode
+                switch(info->params.encoding)
+                {
+                case HDLC_ENCODING_BIPHASE_MARK:
+                case HDLC_ENCODING_BIPHASE_SPACE:
+                        val = BIT7; break;
+                case HDLC_ENCODING_BIPHASE_LEVEL:
+                case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
+                        val = BIT7 + BIT6; break;
+                default: val = BIT6;    // NRZ encodings
+                }
+                wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
+
+                // DPLL requires a 16X reference clock from BRG
+                set_rate(info, info->params.clock_speed * 16);
+        }
+        else
+                set_rate(info, info->params.clock_speed);
+
+        tx_set_idle(info);
+
+        msc_set_vcr(info);
+
+        /* SCR (serial control)
+         *
+         * 15  1=tx req on FIFO half empty
+         * 14  1=rx req on FIFO half full
+         * 13  tx data  IRQ enable
+         * 12  tx idle  IRQ enable
+         * 11  underrun IRQ enable
+         * 10  rx data  IRQ enable
+         * 09  rx idle  IRQ enable
+         * 08  overrun  IRQ enable
+         * 07  DSR      IRQ enable
+         * 06  CTS      IRQ enable
+         * 05  DCD      IRQ enable
+         * 04  RI       IRQ enable
+         * 03  reserved, must be zero
+         * 02  1=txd->rxd internal loopback enable
+         * 01  reserved, must be zero
+         * 00  1=master IRQ enable
+         */
+        wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
+
+        if (info->params.loopback)
+                enable_loopback(info);
+}
+
+/*
+ *  set transmit idle mode
+ */
+static void tx_set_idle(struct slgt_info *info)
+{
+        unsigned char val;
+        unsigned short tcr;
+
+        /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
+         * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
+         */
+        tcr = rd_reg16(info, TCR);
+        if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
+                /* disable preamble, set idle size to 16 bits */
+                tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
+                /* MSB of 16 bit idle specified in tx preamble register (TPR) */
+                wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
+        } else if (!(tcr & BIT6)) {
+                /* preamble is disabled, set idle size to 8 bits */
+                tcr &= ~(BIT5 + BIT4);
+        }
+        wr_reg16(info, TCR, tcr);
+
+        if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
+                /* LSB of custom tx idle specified in tx idle register */
+                val = (unsigned char)(info->idle_mode & 0xff);
+        } else {
+                /* standard 8 bit idle patterns */
+                switch(info->idle_mode)
+                {
+                case HDLC_TXIDLE_FLAGS:          val = 0x7e; break;
+                case HDLC_TXIDLE_ALT_ZEROS_ONES:
+                case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
+                case HDLC_TXIDLE_ZEROS:
+                case HDLC_TXIDLE_SPACE:          val = 0x00; break;
+                default:                         val = 0xff;
+                }
+        }
+
+        wr_reg8(info, TIR, val);
+}
+
+/*
+ * get state of V24 status (input) signals
+ */
+static void get_signals(struct slgt_info *info)
+{
+        unsigned short status = rd_reg16(info, SSR);
+
+        /* clear all serial signals except DTR and RTS */
+        info->signals &= SerialSignal_DTR + SerialSignal_RTS;
+
+        if (status & BIT3)
+                info->signals |= SerialSignal_DSR;
+        if (status & BIT2)
+                info->signals |= SerialSignal_CTS;
+        if (status & BIT1)
+                info->signals |= SerialSignal_DCD;
+        if (status & BIT0)
+                info->signals |= SerialSignal_RI;
+}
+
+/*
+ * set V.24 Control Register based on current configuration
+ */
+static void msc_set_vcr(struct slgt_info *info)
+{
+        unsigned char val = 0;
+
+        /* VCR (V.24 control)
+         *
+         * 07..04  serial IF select
+         * 03      DTR
+         * 02      RTS
+         * 01      LL
+         * 00      RL
+         */
+
+        switch(info->if_mode & MGSL_INTERFACE_MASK)
+        {
+        case MGSL_INTERFACE_RS232:
+                val |= BIT5; /* 0010 */
+                break;
+        case MGSL_INTERFACE_V35:
+                val |= BIT7 + BIT6 + BIT5; /* 1110 */
+                break;
+        case MGSL_INTERFACE_RS422:
+                val |= BIT6; /* 0100 */
+                break;
+        }
+
+        if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
+                val |= BIT4;
+        if (info->signals & SerialSignal_DTR)
+                val |= BIT3;
+        if (info->signals & SerialSignal_RTS)
+                val |= BIT2;
+        if (info->if_mode & MGSL_INTERFACE_LL)
+                val |= BIT1;
+        if (info->if_mode & MGSL_INTERFACE_RL)
+                val |= BIT0;
+        wr_reg8(info, VCR, val);
+}
+
+/*
+ * set state of V24 control (output) signals
+ */
+static void set_signals(struct slgt_info *info)
+{
+        unsigned char val = rd_reg8(info, VCR);
+        if (info->signals & SerialSignal_DTR)
+                val |= BIT3;
+        else
+                val &= ~BIT3;
+        if (info->signals & SerialSignal_RTS)
+                val |= BIT2;
+        else
+                val &= ~BIT2;
+        wr_reg8(info, VCR, val);
+}
+
+/*
+ * free range of receive DMA buffers (i to last)
+ */
+static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
+{
+        int done = 0;
+
+        while(!done) {
+                /* reset current buffer for reuse */
+                info->rbufs[i].status = 0;
+                set_desc_count(info->rbufs[i], info->rbuf_fill_level);
+                if (i == last)
+                        done = 1;
+                if (++i == info->rbuf_count)
+                        i = 0;
+        }
+        info->rbuf_current = i;
+}
+
+/*
+ * mark all receive DMA buffers as free
+ */
+static void reset_rbufs(struct slgt_info *info)
+{
+        free_rbufs(info, 0, info->rbuf_count - 1);
+        info->rbuf_fill_index = 0;
+        info->rbuf_fill_count = 0;
+}
+
+/*
+ * pass receive HDLC frame to upper layer
+ *
+ * return true if frame available, otherwise false
+ */
+static bool rx_get_frame(struct slgt_info *info)
+{
+        unsigned int start, end;
+        unsigned short status;
+        unsigned int framesize = 0;
+        unsigned long flags;
+        struct tty_struct *tty = info->port.tty;
+        unsigned char addr_field = 0xff;
+        unsigned int crc_size = 0;
+
+        switch (info->params.crc_type & HDLC_CRC_MASK) {
+        case HDLC_CRC_16_CCITT: crc_size = 2; break;
+        case HDLC_CRC_32_CCITT: crc_size = 4; break;
+        }
+
+check_again:
+
+        framesize = 0;
+        addr_field = 0xff;
+        start = end = info->rbuf_current;
+
+        for (;;) {
+                if (!desc_complete(info->rbufs[end]))
+                        goto cleanup;
+
+                if (framesize == 0 && info->params.addr_filter != 0xff)
+                        addr_field = info->rbufs[end].buf[0];
+
+                framesize += desc_count(info->rbufs[end]);
+
+                if (desc_eof(info->rbufs[end]))
+                        break;
+
+                if (++end == info->rbuf_count)
+                        end = 0;
+
+                if (end == info->rbuf_current) {
+                        if (info->rx_enabled){
+                                spin_lock_irqsave(&info->lock,flags);
+                                rx_start(info);
+                                spin_unlock_irqrestore(&info->lock,flags);
+                        }
+                        goto cleanup;
+                }
+        }
+
+        /* status
+         *
+         * 15      buffer complete
+         * 14..06  reserved
+         * 05..04  residue
+         * 02      eof (end of frame)
+         * 01      CRC error
+         * 00      abort
+         */
+        status = desc_status(info->rbufs[end]);
+
+        /* ignore CRC bit if not using CRC (bit is undefined) */
+        if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
+                status &= ~BIT1;
+
+        if (framesize == 0 ||
+                 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
+                free_rbufs(info, start, end);
+                goto check_again;
+        }
+
+        if (framesize < (2 + crc_size) || status & BIT0) {
+                info->icount.rxshort++;
+                framesize = 0;
+        } else if (status & BIT1) {
+                info->icount.rxcrc++;
+                if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
+                        framesize = 0;
+        }
+
+#if SYNCLINK_GENERIC_HDLC
+        if (framesize == 0) {
+                info->netdev->stats.rx_errors++;
+                info->netdev->stats.rx_frame_errors++;
+        }
+#endif
+
+        DBGBH(("%s rx frame status=%04X size=%d\n",
+                info->device_name, status, framesize));
+        DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
+
+        if (framesize) {
+                if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
+                        framesize -= crc_size;
+                        crc_size = 0;
+                }
+
+                if (framesize > info->max_frame_size + crc_size)
+                        info->icount.rxlong++;
+                else {
+                        /* copy dma buffer(s) to contiguous temp buffer */
+                        int copy_count = framesize;
+                        int i = start;
+                        unsigned char *p = info->tmp_rbuf;
+                        info->tmp_rbuf_count = framesize;
+
+                        info->icount.rxok++;
+
+                        while(copy_count) {
+                                int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
+                                memcpy(p, info->rbufs[i].buf, partial_count);
+                                p += partial_count;
+                                copy_count -= partial_count;
+                                if (++i == info->rbuf_count)
+                                        i = 0;
+                        }
+
+                        if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
+                                *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
+                                framesize++;
+                        }
+
+#if SYNCLINK_GENERIC_HDLC
+                        if (info->netcount)
+                                hdlcdev_rx(info,info->tmp_rbuf, framesize);
+                        else
+#endif
+                                ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
+                }
+        }
+        free_rbufs(info, start, end);
+        return true;
+
+cleanup:
+        return false;
+}
+
+/*
+ * pass receive buffer (RAW synchronous mode) to tty layer
+ * return true if buffer available, otherwise false
+ */
+static bool rx_get_buf(struct slgt_info *info)
+{
+        unsigned int i = info->rbuf_current;
+        unsigned int count;
+
+        if (!desc_complete(info->rbufs[i]))
+                return false;
+        count = desc_count(info->rbufs[i]);
+        switch(info->params.mode) {
+        case MGSL_MODE_MONOSYNC:
+        case MGSL_MODE_BISYNC:
+        case MGSL_MODE_XSYNC:
+                /* ignore residue in byte synchronous modes */
+                if (desc_residue(info->rbufs[i]))
+                        count--;
+                break;
+        }
+        DBGDATA(info, info->rbufs[i].buf, count, "rx");
+        DBGINFO(("rx_get_buf size=%d\n", count));
+        if (count)
+                ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
+                                  info->flag_buf, count);
+        free_rbufs(info, i, i);
+        return true;
+}
+
+static void reset_tbufs(struct slgt_info *info)
+{
+        unsigned int i;
+        info->tbuf_current = 0;
+        for (i=0 ; i < info->tbuf_count ; i++) {
+                info->tbufs[i].status = 0;
+                info->tbufs[i].count  = 0;
+        }
+}
+
+/*
+ * return number of free transmit DMA buffers
+ */
+static unsigned int free_tbuf_count(struct slgt_info *info)
+{
+        unsigned int count = 0;
+        unsigned int i = info->tbuf_current;
+
+        do
+        {
+                if (desc_count(info->tbufs[i]))
+                        break; /* buffer in use */
+                ++count;
+                if (++i == info->tbuf_count)
+                        i=0;
+        } while (i != info->tbuf_current);
+
+        /* if tx DMA active, last zero count buffer is in use */
+        if (count && (rd_reg32(info, TDCSR) & BIT0))
+                --count;
+
+        return count;
+}
+
+/*
+ * return number of bytes in unsent transmit DMA buffers
+ * and the serial controller tx FIFO
+ */
+static unsigned int tbuf_bytes(struct slgt_info *info)
+{
+        unsigned int total_count = 0;
+        unsigned int i = info->tbuf_current;
+        unsigned int reg_value;
+        unsigned int count;
+        unsigned int active_buf_count = 0;
+
+        /*
+         * Add descriptor counts for all tx DMA buffers.
+         * If count is zero (cleared by DMA controller after read),
+         * the buffer is complete or is actively being read from.
+         *
+         * Record buf_count of last buffer with zero count starting
+         * from current ring position. buf_count is mirror
+         * copy of count and is not cleared by serial controller.
+         * If DMA controller is active, that buffer is actively
+         * being read so add to total.
+         */
+        do {
+                count = desc_count(info->tbufs[i]);
+                if (count)
+                        total_count += count;
+                else if (!total_count)
+                        active_buf_count = info->tbufs[i].buf_count;
+                if (++i == info->tbuf_count)
+                        i = 0;
+        } while (i != info->tbuf_current);
+
+        /* read tx DMA status register */
+        reg_value = rd_reg32(info, TDCSR);
+
+        /* if tx DMA active, last zero count buffer is in use */
+        if (reg_value & BIT0)
+                total_count += active_buf_count;
+
+        /* add tx FIFO count = reg_value[15..8] */
+        total_count += (reg_value >> 8) & 0xff;
+
+        /* if transmitter active add one byte for shift register */
+        if (info->tx_active)
+                total_count++;
+
+        return total_count;
+}
+
+/*
+ * load data into transmit DMA buffer ring and start transmitter if needed
+ * return true if data accepted, otherwise false (buffers full)
+ */
+static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
+{
+        unsigned short count;
+        unsigned int i;
+        struct slgt_desc *d;
+
+        /* check required buffer space */
+        if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
+                return false;
+
+        DBGDATA(info, buf, size, "tx");
+
+        /*
+         * copy data to one or more DMA buffers in circular ring
+         * tbuf_start   = first buffer for this data
+         * tbuf_current = next free buffer
+         *
+         * Copy all data before making data visible to DMA controller by
+         * setting descriptor count of the first buffer.
+         * This prevents an active DMA controller from reading the first DMA
+         * buffers of a frame and stopping before the final buffers are filled.
+         */
+
+        info->tbuf_start = i = info->tbuf_current;
+
+        while (size) {
+                d = &info->tbufs[i];
+
+                count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
+                memcpy(d->buf, buf, count);
+
+                size -= count;
+                buf  += count;
+
+                /*
+                 * set EOF bit for last buffer of HDLC frame or
+                 * for every buffer in raw mode
+                 */
+                if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
+                    info->params.mode == MGSL_MODE_RAW)
+                        set_desc_eof(*d, 1);
+                else
+                        set_desc_eof(*d, 0);
+
+                /* set descriptor count for all but first buffer */
+                if (i != info->tbuf_start)
+                        set_desc_count(*d, count);
+                d->buf_count = count;
+
+                if (++i == info->tbuf_count)
+                        i = 0;
+        }
+
+        info->tbuf_current = i;
+
+        /* set first buffer count to make new data visible to DMA controller */
+        d = &info->tbufs[info->tbuf_start];
+        set_desc_count(*d, d->buf_count);
+
+        /* start transmitter if needed and update transmit timeout */
+        if (!info->tx_active)
+                tx_start(info);
+        update_tx_timer(info);
+
+        return true;
+}
+
+static int register_test(struct slgt_info *info)
+{
+        static unsigned short patterns[] =
+                {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
+        static unsigned int count = ARRAY_SIZE(patterns);
+        unsigned int i;
+        int rc = 0;
+
+        for (i=0 ; i < count ; i++) {
+                wr_reg16(info, TIR, patterns[i]);
+                wr_reg16(info, BDR, patterns[(i+1)%count]);
+                if ((rd_reg16(info, TIR) != patterns[i]) ||
+                    (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
+                        rc = -ENODEV;
+                        break;
+                }
+        }
+        info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
+        info->init_error = rc ? 0 : DiagStatus_AddressFailure;
+        return rc;
+}
+
+static int irq_test(struct slgt_info *info)
+{
+        unsigned long timeout;
+        unsigned long flags;
+        struct tty_struct *oldtty = info->port.tty;
+        u32 speed = info->params.data_rate;
+
+        info->params.data_rate = 921600;
+        info->port.tty = NULL;
+
+        spin_lock_irqsave(&info->lock, flags);
+        async_mode(info);
+        slgt_irq_on(info, IRQ_TXIDLE);
+
+        /* enable transmitter */
+        wr_reg16(info, TCR,
+                (unsigned short)(rd_reg16(info, TCR) | BIT1));
+
+        /* write one byte and wait for tx idle */
+        wr_reg16(info, TDR, 0);
+
+        /* assume failure */
+        info->init_error = DiagStatus_IrqFailure;
+        info->irq_occurred = false;
+
+        spin_unlock_irqrestore(&info->lock, flags);
+
+        timeout=100;
+        while(timeout-- && !info->irq_occurred)
+                msleep_interruptible(10);
+
+        spin_lock_irqsave(&info->lock,flags);
+        reset_port(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        info->params.data_rate = speed;
+        info->port.tty = oldtty;
+
+        info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
+        return info->irq_occurred ? 0 : -ENODEV;
+}
+
+static int loopback_test_rx(struct slgt_info *info)
+{
+        unsigned char *src, *dest;
+        int count;
+
+        if (desc_complete(info->rbufs[0])) {
+                count = desc_count(info->rbufs[0]);
+                src   = info->rbufs[0].buf;
+                dest  = info->tmp_rbuf;
+
+                for( ; count ; count-=2, src+=2) {
+                        /* src=data byte (src+1)=status byte */
+                        if (!(*(src+1) & (BIT9 + BIT8))) {
+                                *dest = *src;
+                                dest++;
+                                info->tmp_rbuf_count++;
+                        }
+                }
+                DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
+                return 1;
+        }
+        return 0;
+}
+
+static int loopback_test(struct slgt_info *info)
+{
+#define TESTFRAMESIZE 20
+
+        unsigned long timeout;
+        u16 count = TESTFRAMESIZE;
+        unsigned char buf[TESTFRAMESIZE];
+        int rc = -ENODEV;
+        unsigned long flags;
+
+        struct tty_struct *oldtty = info->port.tty;
+        MGSL_PARAMS params;
+
+        memcpy(&params, &info->params, sizeof(params));
+
+        info->params.mode = MGSL_MODE_ASYNC;
+        info->params.data_rate = 921600;
+        info->params.loopback = 1;
+        info->port.tty = NULL;
+
+        /* build and send transmit frame */
+        for (count = 0; count < TESTFRAMESIZE; ++count)
+                buf[count] = (unsigned char)count;
+
+        info->tmp_rbuf_count = 0;
+        memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
+
+        /* program hardware for HDLC and enabled receiver */
+        spin_lock_irqsave(&info->lock,flags);
+        async_mode(info);
+        rx_start(info);
+        tx_load(info, buf, count);
+        spin_unlock_irqrestore(&info->lock, flags);
+
+        /* wait for receive complete */
+        for (timeout = 100; timeout; --timeout) {
+                msleep_interruptible(10);
+                if (loopback_test_rx(info)) {
+                        rc = 0;
+                        break;
+                }
+        }
+
+        /* verify received frame length and contents */
+        if (!rc && (info->tmp_rbuf_count != count ||
+                  memcmp(buf, info->tmp_rbuf, count))) {
+                rc = -ENODEV;
+        }
+
+        spin_lock_irqsave(&info->lock,flags);
+        reset_adapter(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        memcpy(&info->params, &params, sizeof(info->params));
+        info->port.tty = oldtty;
+
+        info->init_error = rc ? DiagStatus_DmaFailure : 0;
+        return rc;
+}
+
+static int adapter_test(struct slgt_info *info)
+{
+        DBGINFO(("testing %s\n", info->device_name));
+        if (register_test(info) < 0) {
+                printk("register test failure %s addr=%08X\n",
+                        info->device_name, info->phys_reg_addr);
+        } else if (irq_test(info) < 0) {
+                printk("IRQ test failure %s IRQ=%d\n",
+                        info->device_name, info->irq_level);
+        } else if (loopback_test(info) < 0) {
+                printk("loopback test failure %s\n", info->device_name);
+        }
+        return info->init_error;
+}
+
+/*
+ * transmit timeout handler
+ */
+static void tx_timeout(unsigned long context)
+{
+        struct slgt_info *info = (struct slgt_info*)context;
+        unsigned long flags;
+
+        DBGINFO(("%s tx_timeout\n", info->device_name));
+        if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
+                info->icount.txtimeout++;
+        }
+        spin_lock_irqsave(&info->lock,flags);
+        tx_stop(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+#if SYNCLINK_GENERIC_HDLC
+        if (info->netcount)
+                hdlcdev_tx_done(info);
+        else
+#endif
+                bh_transmit(info);
+}
+
+/*
+ * receive buffer polling timer
+ */
+static void rx_timeout(unsigned long context)
+{
+        struct slgt_info *info = (struct slgt_info*)context;
+        unsigned long flags;
+
+        DBGINFO(("%s rx_timeout\n", info->device_name));
+        spin_lock_irqsave(&info->lock, flags);
+        info->pending_bh |= BH_RECEIVE;
+        spin_unlock_irqrestore(&info->lock, flags);
+        bh_handler(&info->task);
+}
+
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
new file mode 100644
index 000000000000..c77831c7675a
--- /dev/null
+++ b/drivers/tty/synclinkmp.c
@@ -0,0 +1,5600 @@
+/*
+ * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
+ *
+ * Device driver for Microgate SyncLink Multiport
+ * high speed multiprotocol serial adapter.
+ *
+ * written by Paul Fulghum for Microgate Corporation
+ * paulkf@microgate.com
+ *
+ * Microgate and SyncLink are trademarks of Microgate Corporation
+ *
+ * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
+ * This code is released under the GNU General Public License (GPL)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
+#if defined(__i386__)
+#  define BREAKPOINT() asm("   int $3");
+#else
+#  define BREAKPOINT() { }
+#endif
+
+#define MAX_DEVICES 12
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/ioctl.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+#include <linux/bitops.h>
+#include <asm/types.h>
+#include <linux/termios.h>
+#include <linux/workqueue.h>
+#include <linux/hdlc.h>
+#include <linux/synclink.h>
+
+#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
+#define SYNCLINK_GENERIC_HDLC 1
+#else
+#define SYNCLINK_GENERIC_HDLC 0
+#endif
+
+#define GET_USER(error,value,addr) error = get_user(value,addr)
+#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
+#define PUT_USER(error,value,addr) error = put_user(value,addr)
+#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
+
+#include <asm/uaccess.h>
+
+static MGSL_PARAMS default_params = {
+        MGSL_MODE_HDLC,                 /* unsigned long mode */
+        0,                              /* unsigned char loopback; */
+        HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
+        HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
+        0,                              /* unsigned long clock_speed; */
+        0xff,                           /* unsigned char addr_filter; */
+        HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
+        HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
+        HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
+        9600,                           /* unsigned long data_rate; */
+        8,                              /* unsigned char data_bits; */
+        1,                              /* unsigned char stop_bits; */
+        ASYNC_PARITY_NONE               /* unsigned char parity; */
+};
+
+/* size in bytes of DMA data buffers */
+#define SCABUFSIZE      1024
+#define SCA_MEM_SIZE    0x40000
+#define SCA_BASE_SIZE   512
+#define SCA_REG_SIZE    16
+#define SCA_MAX_PORTS   4
+#define SCAMAXDESC      128
+
+#define BUFFERLISTSIZE  4096
+
+/* SCA-I style DMA buffer descriptor */
+typedef struct _SCADESC
+{
+        u16     next;           /* lower l6 bits of next descriptor addr */
+        u16     buf_ptr;        /* lower 16 bits of buffer addr */
+        u8      buf_base;       /* upper 8 bits of buffer addr */
+        u8      pad1;
+        u16     length;         /* length of buffer */
+        u8      status;         /* status of buffer */
+        u8      pad2;
+} SCADESC, *PSCADESC;
+
+typedef struct _SCADESC_EX
+{
+        /* device driver bookkeeping section */
+        char    *virt_addr;     /* virtual address of data buffer */
+        u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
+} SCADESC_EX, *PSCADESC_EX;
+
+/* The queue of BH actions to be performed */
+
+#define BH_RECEIVE  1
+#define BH_TRANSMIT 2
+#define BH_STATUS   4
+
+#define IO_PIN_SHUTDOWN_LIMIT 100
+
+struct  _input_signal_events {
+        int     ri_up;
+        int     ri_down;
+        int     dsr_up;
+        int     dsr_down;
+        int     dcd_up;
+        int     dcd_down;
+        int     cts_up;
+        int     cts_down;
+};
+
+/*
+ * Device instance data structure
+ */
+typedef struct _synclinkmp_info {
+        void *if_ptr;                           /* General purpose pointer (used by SPPP) */
+        int                     magic;
+        struct tty_port         port;
+        int                     line;
+        unsigned short          close_delay;
+        unsigned short          closing_wait;   /* time to wait before closing */
+
+        struct mgsl_icount      icount;
+
+        int                     timeout;
+        int                     x_char;         /* xon/xoff character */
+        u16                     read_status_mask1;  /* break detection (SR1 indications) */
+        u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
+        unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
+        unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
+        unsigned char           *tx_buf;
+        int                     tx_put;
+        int                     tx_get;
+        int                     tx_count;
+
+        wait_queue_head_t       status_event_wait_q;
+        wait_queue_head_t       event_wait_q;
+        struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
+        struct _synclinkmp_info *next_device;   /* device list link */
+        struct timer_list       status_timer;   /* input signal status check timer */
+
+        spinlock_t lock;                /* spinlock for synchronizing with ISR */
+        struct work_struct task;                        /* task structure for scheduling bh */
+
+        u32 max_frame_size;                     /* as set by device config */
+
+        u32 pending_bh;
+
+        bool bh_running;                                /* Protection from multiple */
+        int isr_overflow;
+        bool bh_requested;
+
+        int dcd_chkcount;                       /* check counts to prevent */
+        int cts_chkcount;                       /* too many IRQs if a signal */
+        int dsr_chkcount;                       /* is floating */
+        int ri_chkcount;
+
+        char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
+        unsigned long buffer_list_phys;
+
+        unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
+        SCADESC *rx_buf_list;                   /* list of receive buffer entries */
+        SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
+        unsigned int current_rx_buf;
+
+        unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
+        SCADESC *tx_buf_list;           /* list of transmit buffer entries */
+        SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
+        unsigned int last_tx_buf;
+
+        unsigned char *tmp_rx_buf;
+        unsigned int tmp_rx_buf_count;
+
+        bool rx_enabled;
+        bool rx_overflow;
+
+        bool tx_enabled;
+        bool tx_active;
+        u32 idle_mode;
+
+        unsigned char ie0_value;
+        unsigned char ie1_value;
+        unsigned char ie2_value;
+        unsigned char ctrlreg_value;
+        unsigned char old_signals;
+
+        char device_name[25];                   /* device instance name */
+
+        int port_count;
+        int adapter_num;
+        int port_num;
+
+        struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
+
+        unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
+
+        unsigned int irq_level;                 /* interrupt level */
+        unsigned long irq_flags;
+        bool irq_requested;                     /* true if IRQ requested */
+
+        MGSL_PARAMS params;                     /* communications parameters */
+
+        unsigned char serial_signals;           /* current serial signal states */
+
+        bool irq_occurred;                      /* for diagnostics use */
+        unsigned int init_error;                /* Initialization startup error */
+
+        u32 last_mem_alloc;
+        unsigned char* memory_base;             /* shared memory address (PCI only) */
+        u32 phys_memory_base;
+        int shared_mem_requested;
+
+        unsigned char* sca_base;                /* HD64570 SCA Memory address */
+        u32 phys_sca_base;
+        u32 sca_offset;
+        bool sca_base_requested;
+
+        unsigned char* lcr_base;                /* local config registers (PCI only) */
+        u32 phys_lcr_base;
+        u32 lcr_offset;
+        int lcr_mem_requested;
+
+        unsigned char* statctrl_base;           /* status/control register memory */
+        u32 phys_statctrl_base;
+        u32 statctrl_offset;
+        bool sca_statctrl_requested;
+
+        u32 misc_ctrl_value;
+        char flag_buf[MAX_ASYNC_BUFFER_SIZE];
+        char char_buf[MAX_ASYNC_BUFFER_SIZE];
+        bool drop_rts_on_tx_done;
+
+        struct  _input_signal_events    input_signal_events;
+
+        /* SPPP/Cisco HDLC device parts */
+        int netcount;
+        spinlock_t netlock;
+
+#if SYNCLINK_GENERIC_HDLC
+        struct net_device *netdev;
+#endif
+
+} SLMP_INFO;
+
+#define MGSL_MAGIC 0x5401
+
+/*
+ * define serial signal status change macros
+ */
+#define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
+#define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
+#define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
+#define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
+
+/* Common Register macros */
+#define LPR     0x00
+#define PABR0   0x02
+#define PABR1   0x03
+#define WCRL    0x04
+#define WCRM    0x05
+#define WCRH    0x06
+#define DPCR    0x08
+#define DMER    0x09
+#define ISR0    0x10
+#define ISR1    0x11
+#define ISR2    0x12
+#define IER0    0x14
+#define IER1    0x15
+#define IER2    0x16
+#define ITCR    0x18
+#define INTVR   0x1a
+#define IMVR    0x1c
+
+/* MSCI Register macros */
+#define TRB     0x20
+#define TRBL    0x20
+#define TRBH    0x21
+#define SR0     0x22
+#define SR1     0x23
+#define SR2     0x24
+#define SR3     0x25
+#define FST     0x26
+#define IE0     0x28
+#define IE1     0x29
+#define IE2     0x2a
+#define FIE     0x2b
+#define CMD     0x2c
+#define MD0     0x2e
+#define MD1     0x2f
+#define MD2     0x30
+#define CTL     0x31
+#define SA0     0x32
+#define SA1     0x33
+#define IDL     0x34
+#define TMC     0x35
+#define RXS     0x36
+#define TXS     0x37
+#define TRC0    0x38
+#define TRC1    0x39
+#define RRC     0x3a
+#define CST0    0x3c
+#define CST1    0x3d
+
+/* Timer Register Macros */
+#define TCNT    0x60
+#define TCNTL   0x60
+#define TCNTH   0x61
+#define TCONR   0x62
+#define TCONRL  0x62
+#define TCONRH  0x63
+#define TMCS    0x64
+#define TEPR    0x65
+
+/* DMA Controller Register macros */
+#define DARL    0x80
+#define DARH    0x81
+#define DARB    0x82
+#define BAR     0x80
+#define BARL    0x80
+#define BARH    0x81
+#define BARB    0x82
+#define SAR     0x84
+#define SARL    0x84
+#define SARH    0x85
+#define SARB    0x86
+#define CPB     0x86
+#define CDA     0x88
+#define CDAL    0x88
+#define CDAH    0x89
+#define EDA     0x8a
+#define EDAL    0x8a
+#define EDAH    0x8b
+#define BFL     0x8c
+#define BFLL    0x8c
+#define BFLH    0x8d
+#define BCR     0x8e
+#define BCRL    0x8e
+#define BCRH    0x8f
+#define DSR     0x90
+#define DMR     0x91
+#define FCT     0x93
+#define DIR     0x94
+#define DCMD    0x95
+
+/* combine with timer or DMA register address */
+#define TIMER0  0x00
+#define TIMER1  0x08
+#define TIMER2  0x10
+#define TIMER3  0x18
+#define RXDMA   0x00
+#define TXDMA   0x20
+
+/* SCA Command Codes */
+#define NOOP            0x00
+#define TXRESET         0x01
+#define TXENABLE        0x02
+#define TXDISABLE       0x03
+#define TXCRCINIT       0x04
+#define TXCRCEXCL       0x05
+#define TXEOM           0x06
+#define TXABORT         0x07
+#define MPON            0x08
+#define TXBUFCLR        0x09
+#define RXRESET         0x11
+#define RXENABLE        0x12
+#define RXDISABLE       0x13
+#define RXCRCINIT       0x14
+#define RXREJECT        0x15
+#define SEARCHMP        0x16
+#define RXCRCEXCL       0x17
+#define RXCRCCALC       0x18
+#define CHRESET         0x21
+#define HUNT            0x31
+
+/* DMA command codes */
+#define SWABORT         0x01
+#define FEICLEAR        0x02
+
+/* IE0 */
+#define TXINTE          BIT7
+#define RXINTE          BIT6
+#define TXRDYE          BIT1
+#define RXRDYE          BIT0
+
+/* IE1 & SR1 */
+#define UDRN    BIT7
+#define IDLE    BIT6
+#define SYNCD   BIT4
+#define FLGD    BIT4
+#define CCTS    BIT3
+#define CDCD    BIT2
+#define BRKD    BIT1
+#define ABTD    BIT1
+#define GAPD    BIT1
+#define BRKE    BIT0
+#define IDLD    BIT0
+
+/* IE2 & SR2 */
+#define EOM     BIT7
+#define PMP     BIT6
+#define SHRT    BIT6
+#define PE      BIT5
+#define ABT     BIT5
+#define FRME    BIT4
+#define RBIT    BIT4
+#define OVRN    BIT3
+#define CRCE    BIT2
+
+
+/*
+ * Global linked list of SyncLink devices
+ */
+static SLMP_INFO *synclinkmp_device_list = NULL;
+static int synclinkmp_adapter_count = -1;
+static int synclinkmp_device_count = 0;
+
+/*
+ * Set this param to non-zero to load eax with the
+ * .text section address and breakpoint on module load.
+ * This is useful for use with gdb and add-symbol-file command.
+ */
+static int break_on_load = 0;
+
+/*
+ * Driver major number, defaults to zero to get auto
+ * assigned major number. May be forced as module parameter.
+ */
+static int ttymajor = 0;
+
+/*
+ * Array of user specified options for ISA adapters.
+ */
+static int debug_level = 0;
+static int maxframe[MAX_DEVICES] = {0,};
+
+module_param(break_on_load, bool, 0);
+module_param(ttymajor, int, 0);
+module_param(debug_level, int, 0);
+module_param_array(maxframe, int, NULL, 0);
+
+static char *driver_name = "SyncLink MultiPort driver";
+static char *driver_version = "$Revision: 4.38 $";
+
+static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
+static void synclinkmp_remove_one(struct pci_dev *dev);
+
+static struct pci_device_id synclinkmp_pci_tbl[] = {
+        { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
+        { 0, }, /* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
+
+MODULE_LICENSE("GPL");
+
+static struct pci_driver synclinkmp_pci_driver = {
+        .name           = "synclinkmp",
+        .id_table       = synclinkmp_pci_tbl,
+        .probe          = synclinkmp_init_one,
+        .remove         = __devexit_p(synclinkmp_remove_one),
+};
+
+
+static struct tty_driver *serial_driver;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+
+/* tty callbacks */
+
+static int  open(struct tty_struct *tty, struct file * filp);
+static void close(struct tty_struct *tty, struct file * filp);
+static void hangup(struct tty_struct *tty);
+static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
+
+static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
+static int put_char(struct tty_struct *tty, unsigned char ch);
+static void send_xchar(struct tty_struct *tty, char ch);
+static void wait_until_sent(struct tty_struct *tty, int timeout);
+static int  write_room(struct tty_struct *tty);
+static void flush_chars(struct tty_struct *tty);
+static void flush_buffer(struct tty_struct *tty);
+static void tx_hold(struct tty_struct *tty);
+static void tx_release(struct tty_struct *tty);
+
+static int  ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg);
+static int  chars_in_buffer(struct tty_struct *tty);
+static void throttle(struct tty_struct * tty);
+static void unthrottle(struct tty_struct * tty);
+static int set_break(struct tty_struct *tty, int break_state);
+
+#if SYNCLINK_GENERIC_HDLC
+#define dev_to_port(D) (dev_to_hdlc(D)->priv)
+static void hdlcdev_tx_done(SLMP_INFO *info);
+static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
+static int  hdlcdev_init(SLMP_INFO *info);
+static void hdlcdev_exit(SLMP_INFO *info);
+#endif
+
+/* ioctl handlers */
+
+static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
+static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
+static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
+static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
+static int  set_txidle(SLMP_INFO *info, int idle_mode);
+static int  tx_enable(SLMP_INFO *info, int enable);
+static int  tx_abort(SLMP_INFO *info);
+static int  rx_enable(SLMP_INFO *info, int enable);
+static int  modem_input_wait(SLMP_INFO *info,int arg);
+static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
+static int  tiocmget(struct tty_struct *tty);
+static int  tiocmset(struct tty_struct *tty,
+                        unsigned int set, unsigned int clear);
+static int  set_break(struct tty_struct *tty, int break_state);
+
+static void add_device(SLMP_INFO *info);
+static void device_init(int adapter_num, struct pci_dev *pdev);
+static int  claim_resources(SLMP_INFO *info);
+static void release_resources(SLMP_INFO *info);
+
+static int  startup(SLMP_INFO *info);
+static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
+static int carrier_raised(struct tty_port *port);
+static void shutdown(SLMP_INFO *info);
+static void program_hw(SLMP_INFO *info);
+static void change_params(SLMP_INFO *info);
+
+static bool init_adapter(SLMP_INFO *info);
+static bool register_test(SLMP_INFO *info);
+static bool irq_test(SLMP_INFO *info);
+static bool loopback_test(SLMP_INFO *info);
+static int  adapter_test(SLMP_INFO *info);
+static bool memory_test(SLMP_INFO *info);
+
+static void reset_adapter(SLMP_INFO *info);
+static void reset_port(SLMP_INFO *info);
+static void async_mode(SLMP_INFO *info);
+static void hdlc_mode(SLMP_INFO *info);
+
+static void rx_stop(SLMP_INFO *info);
+static void rx_start(SLMP_INFO *info);
+static void rx_reset_buffers(SLMP_INFO *info);
+static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
+static bool rx_get_frame(SLMP_INFO *info);
+
+static void tx_start(SLMP_INFO *info);
+static void tx_stop(SLMP_INFO *info);
+static void tx_load_fifo(SLMP_INFO *info);
+static void tx_set_idle(SLMP_INFO *info);
+static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
+
+static void get_signals(SLMP_INFO *info);
+static void set_signals(SLMP_INFO *info);
+static void enable_loopback(SLMP_INFO *info, int enable);
+static void set_rate(SLMP_INFO *info, u32 data_rate);
+
+static int  bh_action(SLMP_INFO *info);
+static void bh_handler(struct work_struct *work);
+static void bh_receive(SLMP_INFO *info);
+static void bh_transmit(SLMP_INFO *info);
+static void bh_status(SLMP_INFO *info);
+static void isr_timer(SLMP_INFO *info);
+static void isr_rxint(SLMP_INFO *info);
+static void isr_rxrdy(SLMP_INFO *info);
+static void isr_txint(SLMP_INFO *info);
+static void isr_txrdy(SLMP_INFO *info);
+static void isr_rxdmaok(SLMP_INFO *info);
+static void isr_rxdmaerror(SLMP_INFO *info);
+static void isr_txdmaok(SLMP_INFO *info);
+static void isr_txdmaerror(SLMP_INFO *info);
+static void isr_io_pin(SLMP_INFO *info, u16 status);
+
+static int  alloc_dma_bufs(SLMP_INFO *info);
+static void free_dma_bufs(SLMP_INFO *info);
+static int  alloc_buf_list(SLMP_INFO *info);
+static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
+static int  alloc_tmp_rx_buf(SLMP_INFO *info);
+static void free_tmp_rx_buf(SLMP_INFO *info);
+
+static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
+static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
+static void tx_timeout(unsigned long context);
+static void status_timeout(unsigned long context);
+
+static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
+static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
+static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
+static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
+static unsigned char read_status_reg(SLMP_INFO * info);
+static void write_control_reg(SLMP_INFO * info);
+
+
+static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
+static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
+static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
+
+static u32 misc_ctrl_value = 0x007e4040;
+static u32 lcr1_brdr_value = 0x00800028;
+
+static u32 read_ahead_count = 8;
+
+/* DPCR, DMA Priority Control
+ *
+ * 07..05  Not used, must be 0
+ * 04      BRC, bus release condition: 0=all transfers complete
+ *              1=release after 1 xfer on all channels
+ * 03      CCC, channel change condition: 0=every cycle
+ *              1=after each channel completes all xfers
+ * 02..00  PR<2..0>, priority 100=round robin
+ *
+ * 00000100 = 0x00
+ */
+static unsigned char dma_priority = 0x04;
+
+// Number of bytes that can be written to shared RAM
+// in a single write operation
+static u32 sca_pci_load_interval = 64;
+
+/*
+ * 1st function defined in .text section. Calling this function in
+ * init_module() followed by a breakpoint allows a remote debugger
+ * (gdb) to get the .text address for the add-symbol-file command.
+ * This allows remote debugging of dynamically loadable modules.
+ */
+static void* synclinkmp_get_text_ptr(void);
+static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
+
+static inline int sanity_check(SLMP_INFO *info,
+                               char *name, const char *routine)
+{
+#ifdef SANITY_CHECK
+        static const char *badmagic =
+                "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
+        static const char *badinfo =
+                "Warning: null synclinkmp_struct for (%s) in %s\n";
+
+        if (!info) {
+                printk(badinfo, name, routine);
+                return 1;
+        }
+        if (info->magic != MGSL_MAGIC) {
+                printk(badmagic, name, routine);
+                return 1;
+        }
+#else
+        if (!info)
+                return 1;
+#endif
+        return 0;
+}
+
+/**
+ * line discipline callback wrappers
+ *
+ * The wrappers maintain line discipline references
+ * while calling into the line discipline.
+ *
+ * ldisc_receive_buf  - pass receive data to line discipline
+ */
+
+static void ldisc_receive_buf(struct tty_struct *tty,
+                              const __u8 *data, char *flags, int count)
+{
+        struct tty_ldisc *ld;
+        if (!tty)
+                return;
+        ld = tty_ldisc_ref(tty);
+        if (ld) {
+                if (ld->ops->receive_buf)
+                        ld->ops->receive_buf(tty, data, flags, count);
+                tty_ldisc_deref(ld);
+        }
+}
+
+/* tty callbacks */
+
+/* Called when a port is opened.  Init and enable port.
+ */
+static int open(struct tty_struct *tty, struct file *filp)
+{
+        SLMP_INFO *info;
+        int retval, line;
+        unsigned long flags;
+
+        line = tty->index;
+        if ((line < 0) || (line >= synclinkmp_device_count)) {
+                printk("%s(%d): open with invalid line #%d.\n",
+                        __FILE__,__LINE__,line);
+                return -ENODEV;
+        }
+
+        info = synclinkmp_device_list;
+        while(info && info->line != line)
+                info = info->next_device;
+        if (sanity_check(info, tty->name, "open"))
+                return -ENODEV;
+        if ( info->init_error ) {
+                printk("%s(%d):%s device is not allocated, init error=%d\n",
+                        __FILE__,__LINE__,info->device_name,info->init_error);
+                return -ENODEV;
+        }
+
+        tty->driver_data = info;
+        info->port.tty = tty;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s open(), old ref count = %d\n",
+                         __FILE__,__LINE__,tty->driver->name, info->port.count);
+
+        /* If port is closing, signal caller to try again */
+        if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
+                if (info->port.flags & ASYNC_CLOSING)
+                        interruptible_sleep_on(&info->port.close_wait);
+                retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
+                        -EAGAIN : -ERESTARTSYS);
+                goto cleanup;
+        }
+
+        info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+        spin_lock_irqsave(&info->netlock, flags);
+        if (info->netcount) {
+                retval = -EBUSY;
+                spin_unlock_irqrestore(&info->netlock, flags);
+                goto cleanup;
+        }
+        info->port.count++;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        if (info->port.count == 1) {
+                /* 1st open on this device, init hardware */
+                retval = startup(info);
+                if (retval < 0)
+                        goto cleanup;
+        }
+
+        retval = block_til_ready(tty, filp, info);
+        if (retval) {
+                if (debug_level >= DEBUG_LEVEL_INFO)
+                        printk("%s(%d):%s block_til_ready() returned %d\n",
+                                 __FILE__,__LINE__, info->device_name, retval);
+                goto cleanup;
+        }
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s open() success\n",
+                         __FILE__,__LINE__, info->device_name);
+        retval = 0;
+
+cleanup:
+        if (retval) {
+                if (tty->count == 1)
+                        info->port.tty = NULL; /* tty layer will release tty struct */
+                if(info->port.count)
+                        info->port.count--;
+        }
+
+        return retval;
+}
+
+/* Called when port is closed. Wait for remaining data to be
+ * sent. Disable port and free resources.
+ */
+static void close(struct tty_struct *tty, struct file *filp)
+{
+        SLMP_INFO * info = tty->driver_data;
+
+        if (sanity_check(info, tty->name, "close"))
+                return;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s close() entry, count=%d\n",
+                         __FILE__,__LINE__, info->device_name, info->port.count);
+
+        if (tty_port_close_start(&info->port, tty, filp) == 0)
+                goto cleanup;
+
+        mutex_lock(&info->port.mutex);
+        if (info->port.flags & ASYNC_INITIALIZED)
+                wait_until_sent(tty, info->timeout);
+
+        flush_buffer(tty);
+        tty_ldisc_flush(tty);
+        shutdown(info);
+        mutex_unlock(&info->port.mutex);
+
+        tty_port_close_end(&info->port, tty);
+        info->port.tty = NULL;
+cleanup:
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
+                        tty->driver->name, info->port.count);
+}
+
+/* Called by tty_hangup() when a hangup is signaled.
+ * This is the same as closing all open descriptors for the port.
+ */
+static void hangup(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s hangup()\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        if (sanity_check(info, tty->name, "hangup"))
+                return;
+
+        mutex_lock(&info->port.mutex);
+        flush_buffer(tty);
+        shutdown(info);
+
+        spin_lock_irqsave(&info->port.lock, flags);
+        info->port.count = 0;
+        info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
+        info->port.tty = NULL;
+        spin_unlock_irqrestore(&info->port.lock, flags);
+        mutex_unlock(&info->port.mutex);
+
+        wake_up_interruptible(&info->port.open_wait);
+}
+
+/* Set new termios settings
+ */
+static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
+                        tty->driver->name );
+
+        change_params(info);
+
+        /* Handle transition to B0 status */
+        if (old_termios->c_cflag & CBAUD &&
+            !(tty->termios->c_cflag & CBAUD)) {
+                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+                spin_lock_irqsave(&info->lock,flags);
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+
+        /* Handle transition away from B0 status */
+        if (!(old_termios->c_cflag & CBAUD) &&
+            tty->termios->c_cflag & CBAUD) {
+                info->serial_signals |= SerialSignal_DTR;
+                if (!(tty->termios->c_cflag & CRTSCTS) ||
+                    !test_bit(TTY_THROTTLED, &tty->flags)) {
+                        info->serial_signals |= SerialSignal_RTS;
+                }
+                spin_lock_irqsave(&info->lock,flags);
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+
+        /* Handle turning off CRTSCTS */
+        if (old_termios->c_cflag & CRTSCTS &&
+            !(tty->termios->c_cflag & CRTSCTS)) {
+                tty->hw_stopped = 0;
+                tx_release(tty);
+        }
+}
+
+/* Send a block of data
+ *
+ * Arguments:
+ *
+ *      tty             pointer to tty information structure
+ *      buf             pointer to buffer containing send data
+ *      count           size of send data in bytes
+ *
+ * Return Value:        number of characters written
+ */
+static int write(struct tty_struct *tty,
+                 const unsigned char *buf, int count)
+{
+        int     c, ret = 0;
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s write() count=%d\n",
+                       __FILE__,__LINE__,info->device_name,count);
+
+        if (sanity_check(info, tty->name, "write"))
+                goto cleanup;
+
+        if (!info->tx_buf)
+                goto cleanup;
+
+        if (info->params.mode == MGSL_MODE_HDLC) {
+                if (count > info->max_frame_size) {
+                        ret = -EIO;
+                        goto cleanup;
+                }
+                if (info->tx_active)
+                        goto cleanup;
+                if (info->tx_count) {
+                        /* send accumulated data from send_char() calls */
+                        /* as frame and wait before accepting more data. */
+                        tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
+                        goto start;
+                }
+                ret = info->tx_count = count;
+                tx_load_dma_buffer(info, buf, count);
+                goto start;
+        }
+
+        for (;;) {
+                c = min_t(int, count,
+                        min(info->max_frame_size - info->tx_count - 1,
+                            info->max_frame_size - info->tx_put));
+                if (c <= 0)
+                        break;
+                        
+                memcpy(info->tx_buf + info->tx_put, buf, c);
+
+                spin_lock_irqsave(&info->lock,flags);
+                info->tx_put += c;
+                if (info->tx_put >= info->max_frame_size)
+                        info->tx_put -= info->max_frame_size;
+                info->tx_count += c;
+                spin_unlock_irqrestore(&info->lock,flags);
+
+                buf += c;
+                count -= c;
+                ret += c;
+        }
+
+        if (info->params.mode == MGSL_MODE_HDLC) {
+                if (count) {
+                        ret = info->tx_count = 0;
+                        goto cleanup;
+                }
+                tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
+        }
+start:
+        if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
+                spin_lock_irqsave(&info->lock,flags);
+                if (!info->tx_active)
+                        tx_start(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+
+cleanup:
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk( "%s(%d):%s write() returning=%d\n",
+                        __FILE__,__LINE__,info->device_name,ret);
+        return ret;
+}
+
+/* Add a character to the transmit buffer.
+ */
+static int put_char(struct tty_struct *tty, unsigned char ch)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+        int ret = 0;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO ) {
+                printk( "%s(%d):%s put_char(%d)\n",
+                        __FILE__,__LINE__,info->device_name,ch);
+        }
+
+        if (sanity_check(info, tty->name, "put_char"))
+                return 0;
+
+        if (!info->tx_buf)
+                return 0;
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        if ( (info->params.mode != MGSL_MODE_HDLC) ||
+             !info->tx_active ) {
+
+                if (info->tx_count < info->max_frame_size - 1) {
+                        info->tx_buf[info->tx_put++] = ch;
+                        if (info->tx_put >= info->max_frame_size)
+                                info->tx_put -= info->max_frame_size;
+                        info->tx_count++;
+                        ret = 1;
+                }
+        }
+
+        spin_unlock_irqrestore(&info->lock,flags);
+        return ret;
+}
+
+/* Send a high-priority XON/XOFF character
+ */
+static void send_xchar(struct tty_struct *tty, char ch)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s send_xchar(%d)\n",
+                         __FILE__,__LINE__, info->device_name, ch );
+
+        if (sanity_check(info, tty->name, "send_xchar"))
+                return;
+
+        info->x_char = ch;
+        if (ch) {
+                /* Make sure transmit interrupts are on */
+                spin_lock_irqsave(&info->lock,flags);
+                if (!info->tx_enabled)
+                        tx_start(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+}
+
+/* Wait until the transmitter is empty.
+ */
+static void wait_until_sent(struct tty_struct *tty, int timeout)
+{
+        SLMP_INFO * info = tty->driver_data;
+        unsigned long orig_jiffies, char_time;
+
+        if (!info )
+                return;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s wait_until_sent() entry\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        if (sanity_check(info, tty->name, "wait_until_sent"))
+                return;
+
+        if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
+                goto exit;
+
+        orig_jiffies = jiffies;
+
+        /* Set check interval to 1/5 of estimated time to
+         * send a character, and make it at least 1. The check
+         * interval should also be less than the timeout.
+         * Note: use tight timings here to satisfy the NIST-PCTS.
+         */
+
+        if ( info->params.data_rate ) {
+                char_time = info->timeout/(32 * 5);
+                if (!char_time)
+                        char_time++;
+        } else
+                char_time = 1;
+
+        if (timeout)
+                char_time = min_t(unsigned long, char_time, timeout);
+
+        if ( info->params.mode == MGSL_MODE_HDLC ) {
+                while (info->tx_active) {
+                        msleep_interruptible(jiffies_to_msecs(char_time));
+                        if (signal_pending(current))
+                                break;
+                        if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                                break;
+                }
+        } else {
+                /*
+                 * TODO: determine if there is something similar to USC16C32
+                 *       TXSTATUS_ALL_SENT status
+                 */
+                while ( info->tx_active && info->tx_enabled) {
+                        msleep_interruptible(jiffies_to_msecs(char_time));
+                        if (signal_pending(current))
+                                break;
+                        if (timeout && time_after(jiffies, orig_jiffies + timeout))
+                                break;
+                }
+        }
+
+exit:
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s wait_until_sent() exit\n",
+                         __FILE__,__LINE__, info->device_name );
+}
+
+/* Return the count of free bytes in transmit buffer
+ */
+static int write_room(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        int ret;
+
+        if (sanity_check(info, tty->name, "write_room"))
+                return 0;
+
+        if (info->params.mode == MGSL_MODE_HDLC) {
+                ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
+        } else {
+                ret = info->max_frame_size - info->tx_count - 1;
+                if (ret < 0)
+                        ret = 0;
+        }
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s write_room()=%d\n",
+                       __FILE__, __LINE__, info->device_name, ret);
+
+        return ret;
+}
+
+/* enable transmitter and send remaining buffered characters
+ */
+static void flush_chars(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
+                        __FILE__,__LINE__,info->device_name,info->tx_count);
+
+        if (sanity_check(info, tty->name, "flush_chars"))
+                return;
+
+        if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
+            !info->tx_buf)
+                return;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
+                        __FILE__,__LINE__,info->device_name );
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        if (!info->tx_active) {
+                if ( (info->params.mode == MGSL_MODE_HDLC) &&
+                        info->tx_count ) {
+                        /* operating in synchronous (frame oriented) mode */
+                        /* copy data from circular tx_buf to */
+                        /* transmit DMA buffer. */
+                        tx_load_dma_buffer(info,
+                                 info->tx_buf,info->tx_count);
+                }
+                tx_start(info);
+        }
+
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+/* Discard all data in the send buffer
+ */
+static void flush_buffer(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s flush_buffer() entry\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        if (sanity_check(info, tty->name, "flush_buffer"))
+                return;
+
+        spin_lock_irqsave(&info->lock,flags);
+        info->tx_count = info->tx_put = info->tx_get = 0;
+        del_timer(&info->tx_timer);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        tty_wakeup(tty);
+}
+
+/* throttle (stop) transmitter
+ */
+static void tx_hold(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "tx_hold"))
+                return;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("%s(%d):%s tx_hold()\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        spin_lock_irqsave(&info->lock,flags);
+        if (info->tx_enabled)
+                tx_stop(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+/* release (start) transmitter
+ */
+static void tx_release(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (sanity_check(info, tty->name, "tx_release"))
+                return;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("%s(%d):%s tx_release()\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        spin_lock_irqsave(&info->lock,flags);
+        if (!info->tx_enabled)
+                tx_start(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+/* Service an IOCTL request
+ *
+ * Arguments:
+ *
+ *      tty     pointer to tty instance data
+ *      cmd     IOCTL command code
+ *      arg     command argument/context
+ *
+ * Return Value:        0 if success, otherwise error code
+ */
+static int ioctl(struct tty_struct *tty,
+                 unsigned int cmd, unsigned long arg)
+{
+        SLMP_INFO *info = tty->driver_data;
+        void __user *argp = (void __user *)arg;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
+                        info->device_name, cmd );
+
+        if (sanity_check(info, tty->name, "ioctl"))
+                return -ENODEV;
+
+        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+            (cmd != TIOCMIWAIT)) {
+                if (tty->flags & (1 << TTY_IO_ERROR))
+                    return -EIO;
+        }
+
+        switch (cmd) {
+        case MGSL_IOCGPARAMS:
+                return get_params(info, argp);
+        case MGSL_IOCSPARAMS:
+                return set_params(info, argp);
+        case MGSL_IOCGTXIDLE:
+                return get_txidle(info, argp);
+        case MGSL_IOCSTXIDLE:
+                return set_txidle(info, (int)arg);
+        case MGSL_IOCTXENABLE:
+                return tx_enable(info, (int)arg);
+        case MGSL_IOCRXENABLE:
+                return rx_enable(info, (int)arg);
+        case MGSL_IOCTXABORT:
+                return tx_abort(info);
+        case MGSL_IOCGSTATS:
+                return get_stats(info, argp);
+        case MGSL_IOCWAITEVENT:
+                return wait_mgsl_event(info, argp);
+        case MGSL_IOCLOOPTXDONE:
+                return 0; // TODO: Not supported, need to document
+                /* Wait for modem input (DCD,RI,DSR,CTS) change
+                 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
+                 */
+        case TIOCMIWAIT:
+                return modem_input_wait(info,(int)arg);
+                
+                /*
+                 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+                 * Return: write counters to the user passed counter struct
+                 * NB: both 1->0 and 0->1 transitions are counted except for
+                 *     RI where only 0->1 is counted.
+                 */
+        default:
+                return -ENOIOCTLCMD;
+        }
+        return 0;
+}
+
+static int get_icount(struct tty_struct *tty,
+                                struct serial_icounter_struct *icount)
+{
+        SLMP_INFO *info = tty->driver_data;
+        struct mgsl_icount cnow;        /* kernel counter temps */
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+        cnow = info->icount;
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        icount->cts = cnow.cts;
+        icount->dsr = cnow.dsr;
+        icount->rng = cnow.rng;
+        icount->dcd = cnow.dcd;
+        icount->rx = cnow.rx;
+        icount->tx = cnow.tx;
+        icount->frame = cnow.frame;
+        icount->overrun = cnow.overrun;
+        icount->parity = cnow.parity;
+        icount->brk = cnow.brk;
+        icount->buf_overrun = cnow.buf_overrun;
+
+        return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline void line_info(struct seq_file *m, SLMP_INFO *info)
+{
+        char    stat_buf[30];
+        unsigned long flags;
+
+        seq_printf(m, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
+                       "\tIRQ=%d MaxFrameSize=%u\n",
+                info->device_name,
+                info->phys_sca_base,
+                info->phys_memory_base,
+                info->phys_statctrl_base,
+                info->phys_lcr_base,
+                info->irq_level,
+                info->max_frame_size );
+
+        /* output current serial signal states */
+        spin_lock_irqsave(&info->lock,flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        stat_buf[0] = 0;
+        stat_buf[1] = 0;
+        if (info->serial_signals & SerialSignal_RTS)
+                strcat(stat_buf, "|RTS");
+        if (info->serial_signals & SerialSignal_CTS)
+                strcat(stat_buf, "|CTS");
+        if (info->serial_signals & SerialSignal_DTR)
+                strcat(stat_buf, "|DTR");
+        if (info->serial_signals & SerialSignal_DSR)
+                strcat(stat_buf, "|DSR");
+        if (info->serial_signals & SerialSignal_DCD)
+                strcat(stat_buf, "|CD");
+        if (info->serial_signals & SerialSignal_RI)
+                strcat(stat_buf, "|RI");
+
+        if (info->params.mode == MGSL_MODE_HDLC) {
+                seq_printf(m, "\tHDLC txok:%d rxok:%d",
+                              info->icount.txok, info->icount.rxok);
+                if (info->icount.txunder)
+                        seq_printf(m, " txunder:%d", info->icount.txunder);
+                if (info->icount.txabort)
+                        seq_printf(m, " txabort:%d", info->icount.txabort);
+                if (info->icount.rxshort)
+                        seq_printf(m, " rxshort:%d", info->icount.rxshort);
+                if (info->icount.rxlong)
+                        seq_printf(m, " rxlong:%d", info->icount.rxlong);
+                if (info->icount.rxover)
+                        seq_printf(m, " rxover:%d", info->icount.rxover);
+                if (info->icount.rxcrc)
+                        seq_printf(m, " rxlong:%d", info->icount.rxcrc);
+        } else {
+                seq_printf(m, "\tASYNC tx:%d rx:%d",
+                              info->icount.tx, info->icount.rx);
+                if (info->icount.frame)
+                        seq_printf(m, " fe:%d", info->icount.frame);
+                if (info->icount.parity)
+                        seq_printf(m, " pe:%d", info->icount.parity);
+                if (info->icount.brk)
+                        seq_printf(m, " brk:%d", info->icount.brk);
+                if (info->icount.overrun)
+                        seq_printf(m, " oe:%d", info->icount.overrun);
+        }
+
+        /* Append serial signal status to end */
+        seq_printf(m, " %s\n", stat_buf+1);
+
+        seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
+         info->tx_active,info->bh_requested,info->bh_running,
+         info->pending_bh);
+}
+
+/* Called to print information about devices
+ */
+static int synclinkmp_proc_show(struct seq_file *m, void *v)
+{
+        SLMP_INFO *info;
+
+        seq_printf(m, "synclinkmp driver:%s\n", driver_version);
+
+        info = synclinkmp_device_list;
+        while( info ) {
+                line_info(m, info);
+                info = info->next_device;
+        }
+        return 0;
+}
+
+static int synclinkmp_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, synclinkmp_proc_show, NULL);
+}
+
+static const struct file_operations synclinkmp_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = synclinkmp_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+/* Return the count of bytes in transmit buffer
+ */
+static int chars_in_buffer(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+
+        if (sanity_check(info, tty->name, "chars_in_buffer"))
+                return 0;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s chars_in_buffer()=%d\n",
+                       __FILE__, __LINE__, info->device_name, info->tx_count);
+
+        return info->tx_count;
+}
+
+/* Signal remote device to throttle send data (our receive data)
+ */
+static void throttle(struct tty_struct * tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s throttle() entry\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        if (sanity_check(info, tty->name, "throttle"))
+                return;
+
+        if (I_IXOFF(tty))
+                send_xchar(tty, STOP_CHAR(tty));
+
+        if (tty->termios->c_cflag & CRTSCTS) {
+                spin_lock_irqsave(&info->lock,flags);
+                info->serial_signals &= ~SerialSignal_RTS;
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+}
+
+/* Signal remote device to stop throttling send data (our receive data)
+ */
+static void unthrottle(struct tty_struct * tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s unthrottle() entry\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        if (sanity_check(info, tty->name, "unthrottle"))
+                return;
+
+        if (I_IXOFF(tty)) {
+                if (info->x_char)
+                        info->x_char = 0;
+                else
+                        send_xchar(tty, START_CHAR(tty));
+        }
+
+        if (tty->termios->c_cflag & CRTSCTS) {
+                spin_lock_irqsave(&info->lock,flags);
+                info->serial_signals |= SerialSignal_RTS;
+                set_signals(info);
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+}
+
+/* set or clear transmit break condition
+ * break_state  -1=set break condition, 0=clear
+ */
+static int set_break(struct tty_struct *tty, int break_state)
+{
+        unsigned char RegValue;
+        SLMP_INFO * info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s set_break(%d)\n",
+                         __FILE__,__LINE__, info->device_name, break_state);
+
+        if (sanity_check(info, tty->name, "set_break"))
+                return -EINVAL;
+
+        spin_lock_irqsave(&info->lock,flags);
+        RegValue = read_reg(info, CTL);
+        if (break_state == -1)
+                RegValue |= BIT3;
+        else
+                RegValue &= ~BIT3;
+        write_reg(info, CTL, RegValue);
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+#if SYNCLINK_GENERIC_HDLC
+
+/**
+ * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
+ * set encoding and frame check sequence (FCS) options
+ *
+ * dev       pointer to network device structure
+ * encoding  serial encoding setting
+ * parity    FCS setting
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
+                          unsigned short parity)
+{
+        SLMP_INFO *info = dev_to_port(dev);
+        unsigned char  new_encoding;
+        unsigned short new_crctype;
+
+        /* return error if TTY interface open */
+        if (info->port.count)
+                return -EBUSY;
+
+        switch (encoding)
+        {
+        case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
+        case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
+        case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
+        case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
+        case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
+        default: return -EINVAL;
+        }
+
+        switch (parity)
+        {
+        case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
+        case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
+        case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
+        default: return -EINVAL;
+        }
+
+        info->params.encoding = new_encoding;
+        info->params.crc_type = new_crctype;
+
+        /* if network interface up, reprogram hardware */
+        if (info->netcount)
+                program_hw(info);
+
+        return 0;
+}
+
+/**
+ * called by generic HDLC layer to send frame
+ *
+ * skb  socket buffer containing HDLC frame
+ * dev  pointer to network device structure
+ */
+static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
+                                      struct net_device *dev)
+{
+        SLMP_INFO *info = dev_to_port(dev);
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
+
+        /* stop sending until this frame completes */
+        netif_stop_queue(dev);
+
+        /* copy data to device buffers */
+        info->tx_count = skb->len;
+        tx_load_dma_buffer(info, skb->data, skb->len);
+
+        /* update network statistics */
+        dev->stats.tx_packets++;
+        dev->stats.tx_bytes += skb->len;
+
+        /* done with socket buffer, so free it */
+        dev_kfree_skb(skb);
+
+        /* save start time for transmit timeout detection */
+        dev->trans_start = jiffies;
+
+        /* start hardware transmitter if necessary */
+        spin_lock_irqsave(&info->lock,flags);
+        if (!info->tx_active)
+                tx_start(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        return NETDEV_TX_OK;
+}
+
+/**
+ * called by network layer when interface enabled
+ * claim resources and initialize hardware
+ *
+ * dev  pointer to network device structure
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_open(struct net_device *dev)
+{
+        SLMP_INFO *info = dev_to_port(dev);
+        int rc;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
+
+        /* generic HDLC layer open processing */
+        if ((rc = hdlc_open(dev)))
+                return rc;
+
+        /* arbitrate between network and tty opens */
+        spin_lock_irqsave(&info->netlock, flags);
+        if (info->port.count != 0 || info->netcount != 0) {
+                printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
+                spin_unlock_irqrestore(&info->netlock, flags);
+                return -EBUSY;
+        }
+        info->netcount=1;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        /* claim resources and init adapter */
+        if ((rc = startup(info)) != 0) {
+                spin_lock_irqsave(&info->netlock, flags);
+                info->netcount=0;
+                spin_unlock_irqrestore(&info->netlock, flags);
+                return rc;
+        }
+
+        /* assert DTR and RTS, apply hardware settings */
+        info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        program_hw(info);
+
+        /* enable network layer transmit */
+        dev->trans_start = jiffies;
+        netif_start_queue(dev);
+
+        /* inform generic HDLC layer of current DCD status */
+        spin_lock_irqsave(&info->lock, flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock, flags);
+        if (info->serial_signals & SerialSignal_DCD)
+                netif_carrier_on(dev);
+        else
+                netif_carrier_off(dev);
+        return 0;
+}
+
+/**
+ * called by network layer when interface is disabled
+ * shutdown hardware and release resources
+ *
+ * dev  pointer to network device structure
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_close(struct net_device *dev)
+{
+        SLMP_INFO *info = dev_to_port(dev);
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
+
+        netif_stop_queue(dev);
+
+        /* shutdown adapter and release resources */
+        shutdown(info);
+
+        hdlc_close(dev);
+
+        spin_lock_irqsave(&info->netlock, flags);
+        info->netcount=0;
+        spin_unlock_irqrestore(&info->netlock, flags);
+
+        return 0;
+}
+
+/**
+ * called by network layer to process IOCTL call to network device
+ *
+ * dev  pointer to network device structure
+ * ifr  pointer to network interface request structure
+ * cmd  IOCTL command code
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+        const size_t size = sizeof(sync_serial_settings);
+        sync_serial_settings new_line;
+        sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
+        SLMP_INFO *info = dev_to_port(dev);
+        unsigned int flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
+
+        /* return error if TTY interface open */
+        if (info->port.count)
+                return -EBUSY;
+
+        if (cmd != SIOCWANDEV)
+                return hdlc_ioctl(dev, ifr, cmd);
+
+        switch(ifr->ifr_settings.type) {
+        case IF_GET_IFACE: /* return current sync_serial_settings */
+
+                ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
+                if (ifr->ifr_settings.size < size) {
+                        ifr->ifr_settings.size = size; /* data size wanted */
+                        return -ENOBUFS;
+                }
+
+                flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                              HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                              HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                              HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
+
+                switch (flags){
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
+                case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
+                case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
+                default: new_line.clock_type = CLOCK_DEFAULT;
+                }
+
+                new_line.clock_rate = info->params.clock_speed;
+                new_line.loopback   = info->params.loopback ? 1:0;
+
+                if (copy_to_user(line, &new_line, size))
+                        return -EFAULT;
+                return 0;
+
+        case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
+
+                if(!capable(CAP_NET_ADMIN))
+                        return -EPERM;
+                if (copy_from_user(&new_line, line, size))
+                        return -EFAULT;
+
+                switch (new_line.clock_type)
+                {
+                case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
+                case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
+                case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
+                case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
+                case CLOCK_DEFAULT:  flags = info->params.flags &
+                                             (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                              HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                              HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                              HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
+                default: return -EINVAL;
+                }
+
+                if (new_line.loopback != 0 && new_line.loopback != 1)
+                        return -EINVAL;
+
+                info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
+                                        HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
+                                        HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
+                                        HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
+                info->params.flags |= flags;
+
+                info->params.loopback = new_line.loopback;
+
+                if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
+                        info->params.clock_speed = new_line.clock_rate;
+                else
+                        info->params.clock_speed = 0;
+
+                /* if network interface up, reprogram hardware */
+                if (info->netcount)
+                        program_hw(info);
+                return 0;
+
+        default:
+                return hdlc_ioctl(dev, ifr, cmd);
+        }
+}
+
+/**
+ * called by network layer when transmit timeout is detected
+ *
+ * dev  pointer to network device structure
+ */
+static void hdlcdev_tx_timeout(struct net_device *dev)
+{
+        SLMP_INFO *info = dev_to_port(dev);
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("hdlcdev_tx_timeout(%s)\n",dev->name);
+
+        dev->stats.tx_errors++;
+        dev->stats.tx_aborted_errors++;
+
+        spin_lock_irqsave(&info->lock,flags);
+        tx_stop(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        netif_wake_queue(dev);
+}
+
+/**
+ * called by device driver when transmit completes
+ * reenable network layer transmit if stopped
+ *
+ * info  pointer to device instance information
+ */
+static void hdlcdev_tx_done(SLMP_INFO *info)
+{
+        if (netif_queue_stopped(info->netdev))
+                netif_wake_queue(info->netdev);
+}
+
+/**
+ * called by device driver when frame received
+ * pass frame to network layer
+ *
+ * info  pointer to device instance information
+ * buf   pointer to buffer contianing frame data
+ * size  count of data bytes in buf
+ */
+static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
+{
+        struct sk_buff *skb = dev_alloc_skb(size);
+        struct net_device *dev = info->netdev;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("hdlcdev_rx(%s)\n",dev->name);
+
+        if (skb == NULL) {
+                printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
+                       dev->name);
+                dev->stats.rx_dropped++;
+                return;
+        }
+
+        memcpy(skb_put(skb, size), buf, size);
+
+        skb->protocol = hdlc_type_trans(skb, dev);
+
+        dev->stats.rx_packets++;
+        dev->stats.rx_bytes += size;
+
+        netif_rx(skb);
+}
+
+static const struct net_device_ops hdlcdev_ops = {
+        .ndo_open       = hdlcdev_open,
+        .ndo_stop       = hdlcdev_close,
+        .ndo_change_mtu = hdlc_change_mtu,
+        .ndo_start_xmit = hdlc_start_xmit,
+        .ndo_do_ioctl   = hdlcdev_ioctl,
+        .ndo_tx_timeout = hdlcdev_tx_timeout,
+};
+
+/**
+ * called by device driver when adding device instance
+ * do generic HDLC initialization
+ *
+ * info  pointer to device instance information
+ *
+ * returns 0 if success, otherwise error code
+ */
+static int hdlcdev_init(SLMP_INFO *info)
+{
+        int rc;
+        struct net_device *dev;
+        hdlc_device *hdlc;
+
+        /* allocate and initialize network and HDLC layer objects */
+
+        if (!(dev = alloc_hdlcdev(info))) {
+                printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
+                return -ENOMEM;
+        }
+
+        /* for network layer reporting purposes only */
+        dev->mem_start = info->phys_sca_base;
+        dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
+        dev->irq       = info->irq_level;
+
+        /* network layer callbacks and settings */
+        dev->netdev_ops     = &hdlcdev_ops;
+        dev->watchdog_timeo = 10 * HZ;
+        dev->tx_queue_len   = 50;
+
+        /* generic HDLC layer callbacks and settings */
+        hdlc         = dev_to_hdlc(dev);
+        hdlc->attach = hdlcdev_attach;
+        hdlc->xmit   = hdlcdev_xmit;
+
+        /* register objects with HDLC layer */
+        if ((rc = register_hdlc_device(dev))) {
+                printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
+                free_netdev(dev);
+                return rc;
+        }
+
+        info->netdev = dev;
+        return 0;
+}
+
+/**
+ * called by device driver when removing device instance
+ * do generic HDLC cleanup
+ *
+ * info  pointer to device instance information
+ */
+static void hdlcdev_exit(SLMP_INFO *info)
+{
+        unregister_hdlc_device(info->netdev);
+        free_netdev(info->netdev);
+        info->netdev = NULL;
+}
+
+#endif /* CONFIG_HDLC */
+
+
+/* Return next bottom half action to perform.
+ * Return Value:        BH action code or 0 if nothing to do.
+ */
+static int bh_action(SLMP_INFO *info)
+{
+        unsigned long flags;
+        int rc = 0;
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        if (info->pending_bh & BH_RECEIVE) {
+                info->pending_bh &= ~BH_RECEIVE;
+                rc = BH_RECEIVE;
+        } else if (info->pending_bh & BH_TRANSMIT) {
+                info->pending_bh &= ~BH_TRANSMIT;
+                rc = BH_TRANSMIT;
+        } else if (info->pending_bh & BH_STATUS) {
+                info->pending_bh &= ~BH_STATUS;
+                rc = BH_STATUS;
+        }
+
+        if (!rc) {
+                /* Mark BH routine as complete */
+                info->bh_running = false;
+                info->bh_requested = false;
+        }
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        return rc;
+}
+
+/* Perform bottom half processing of work items queued by ISR.
+ */
+static void bh_handler(struct work_struct *work)
+{
+        SLMP_INFO *info = container_of(work, SLMP_INFO, task);
+        int action;
+
+        if (!info)
+                return;
+
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):%s bh_handler() entry\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        info->bh_running = true;
+
+        while((action = bh_action(info)) != 0) {
+
+                /* Process work item */
+                if ( debug_level >= DEBUG_LEVEL_BH )
+                        printk( "%s(%d):%s bh_handler() work item action=%d\n",
+                                __FILE__,__LINE__,info->device_name, action);
+
+                switch (action) {
+
+                case BH_RECEIVE:
+                        bh_receive(info);
+                        break;
+                case BH_TRANSMIT:
+                        bh_transmit(info);
+                        break;
+                case BH_STATUS:
+                        bh_status(info);
+                        break;
+                default:
+                        /* unknown work item ID */
+                        printk("%s(%d):%s Unknown work item ID=%08X!\n",
+                                __FILE__,__LINE__,info->device_name,action);
+                        break;
+                }
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):%s bh_handler() exit\n",
+                        __FILE__,__LINE__,info->device_name);
+}
+
+static void bh_receive(SLMP_INFO *info)
+{
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):%s bh_receive()\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        while( rx_get_frame(info) );
+}
+
+static void bh_transmit(SLMP_INFO *info)
+{
+        struct tty_struct *tty = info->port.tty;
+
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):%s bh_transmit() entry\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        if (tty)
+                tty_wakeup(tty);
+}
+
+static void bh_status(SLMP_INFO *info)
+{
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk( "%s(%d):%s bh_status() entry\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        info->ri_chkcount = 0;
+        info->dsr_chkcount = 0;
+        info->dcd_chkcount = 0;
+        info->cts_chkcount = 0;
+}
+
+static void isr_timer(SLMP_INFO * info)
+{
+        unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
+
+        /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
+        write_reg(info, IER2, 0);
+
+        /* TMCS, Timer Control/Status Register
+         *
+         * 07      CMF, Compare match flag (read only) 1=match
+         * 06      ECMI, CMF Interrupt Enable: 0=disabled
+         * 05      Reserved, must be 0
+         * 04      TME, Timer Enable
+         * 03..00  Reserved, must be 0
+         *
+         * 0000 0000
+         */
+        write_reg(info, (unsigned char)(timer + TMCS), 0);
+
+        info->irq_occurred = true;
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_timer()\n",
+                        __FILE__,__LINE__,info->device_name);
+}
+
+static void isr_rxint(SLMP_INFO * info)
+{
+        struct tty_struct *tty = info->port.tty;
+        struct  mgsl_icount *icount = &info->icount;
+        unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
+        unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
+
+        /* clear status bits */
+        if (status)
+                write_reg(info, SR1, status);
+
+        if (status2)
+                write_reg(info, SR2, status2);
+        
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_rxint status=%02X %02x\n",
+                        __FILE__,__LINE__,info->device_name,status,status2);
+
+        if (info->params.mode == MGSL_MODE_ASYNC) {
+                if (status & BRKD) {
+                        icount->brk++;
+
+                        /* process break detection if tty control
+                         * is not set to ignore it
+                         */
+                        if ( tty ) {
+                                if (!(status & info->ignore_status_mask1)) {
+                                        if (info->read_status_mask1 & BRKD) {
+                                                tty_insert_flip_char(tty, 0, TTY_BREAK);
+                                                if (info->port.flags & ASYNC_SAK)
+                                                        do_SAK(tty);
+                                        }
+                                }
+                        }
+                }
+        }
+        else {
+                if (status & (FLGD|IDLD)) {
+                        if (status & FLGD)
+                                info->icount.exithunt++;
+                        else if (status & IDLD)
+                                info->icount.rxidle++;
+                        wake_up_interruptible(&info->event_wait_q);
+                }
+        }
+
+        if (status & CDCD) {
+                /* simulate a common modem status change interrupt
+                 * for our handler
+                 */
+                get_signals( info );
+                isr_io_pin(info,
+                        MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
+        }
+}
+
+/*
+ * handle async rx data interrupts
+ */
+static void isr_rxrdy(SLMP_INFO * info)
+{
+        u16 status;
+        unsigned char DataByte;
+        struct tty_struct *tty = info->port.tty;
+        struct  mgsl_icount *icount = &info->icount;
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_rxrdy\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        while((status = read_reg(info,CST0)) & BIT0)
+        {
+                int flag = 0;
+                bool over = false;
+                DataByte = read_reg(info,TRB);
+
+                icount->rx++;
+
+                if ( status & (PE + FRME + OVRN) ) {
+                        printk("%s(%d):%s rxerr=%04X\n",
+                                __FILE__,__LINE__,info->device_name,status);
+
+                        /* update error statistics */
+                        if (status & PE)
+                                icount->parity++;
+                        else if (status & FRME)
+                                icount->frame++;
+                        else if (status & OVRN)
+                                icount->overrun++;
+
+                        /* discard char if tty control flags say so */
+                        if (status & info->ignore_status_mask2)
+                                continue;
+
+                        status &= info->read_status_mask2;
+
+                        if ( tty ) {
+                                if (status & PE)
+                                        flag = TTY_PARITY;
+                                else if (status & FRME)
+                                        flag = TTY_FRAME;
+                                if (status & OVRN) {
+                                        /* Overrun is special, since it's
+                                         * reported immediately, and doesn't
+                                         * affect the current character
+                                         */
+                                        over = true;
+                                }
+                        }
+                }       /* end of if (error) */
+
+                if ( tty ) {
+                        tty_insert_flip_char(tty, DataByte, flag);
+                        if (over)
+                                tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+                }
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_ISR ) {
+                printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
+                        __FILE__,__LINE__,info->device_name,
+                        icount->rx,icount->brk,icount->parity,
+                        icount->frame,icount->overrun);
+        }
+
+        if ( tty )
+                tty_flip_buffer_push(tty);
+}
+
+static void isr_txeom(SLMP_INFO * info, unsigned char status)
+{
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_txeom status=%02x\n",
+                        __FILE__,__LINE__,info->device_name,status);
+
+        write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
+        write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
+        write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
+
+        if (status & UDRN) {
+                write_reg(info, CMD, TXRESET);
+                write_reg(info, CMD, TXENABLE);
+        } else
+                write_reg(info, CMD, TXBUFCLR);
+
+        /* disable and clear tx interrupts */
+        info->ie0_value &= ~TXRDYE;
+        info->ie1_value &= ~(IDLE + UDRN);
+        write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
+        write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
+
+        if ( info->tx_active ) {
+                if (info->params.mode != MGSL_MODE_ASYNC) {
+                        if (status & UDRN)
+                                info->icount.txunder++;
+                        else if (status & IDLE)
+                                info->icount.txok++;
+                }
+
+                info->tx_active = false;
+                info->tx_count = info->tx_put = info->tx_get = 0;
+
+                del_timer(&info->tx_timer);
+
+                if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
+                        info->serial_signals &= ~SerialSignal_RTS;
+                        info->drop_rts_on_tx_done = false;
+                        set_signals(info);
+                }
+
+#if SYNCLINK_GENERIC_HDLC
+                if (info->netcount)
+                        hdlcdev_tx_done(info);
+                else
+#endif
+                {
+                        if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
+                                tx_stop(info);
+                                return;
+                        }
+                        info->pending_bh |= BH_TRANSMIT;
+                }
+        }
+}
+
+
+/*
+ * handle tx status interrupts
+ */
+static void isr_txint(SLMP_INFO * info)
+{
+        unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
+
+        /* clear status bits */
+        write_reg(info, SR1, status);
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_txint status=%02x\n",
+                        __FILE__,__LINE__,info->device_name,status);
+
+        if (status & (UDRN + IDLE))
+                isr_txeom(info, status);
+
+        if (status & CCTS) {
+                /* simulate a common modem status change interrupt
+                 * for our handler
+                 */
+                get_signals( info );
+                isr_io_pin(info,
+                        MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
+
+        }
+}
+
+/*
+ * handle async tx data interrupts
+ */
+static void isr_txrdy(SLMP_INFO * info)
+{
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
+                        __FILE__,__LINE__,info->device_name,info->tx_count);
+
+        if (info->params.mode != MGSL_MODE_ASYNC) {
+                /* disable TXRDY IRQ, enable IDLE IRQ */
+                info->ie0_value &= ~TXRDYE;
+                info->ie1_value |= IDLE;
+                write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
+                return;
+        }
+
+        if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
+                tx_stop(info);
+                return;
+        }
+
+        if ( info->tx_count )
+                tx_load_fifo( info );
+        else {
+                info->tx_active = false;
+                info->ie0_value &= ~TXRDYE;
+                write_reg(info, IE0, info->ie0_value);
+        }
+
+        if (info->tx_count < WAKEUP_CHARS)
+                info->pending_bh |= BH_TRANSMIT;
+}
+
+static void isr_rxdmaok(SLMP_INFO * info)
+{
+        /* BIT7 = EOT (end of transfer)
+         * BIT6 = EOM (end of message/frame)
+         */
+        unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
+
+        /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
+        write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
+                        __FILE__,__LINE__,info->device_name,status);
+
+        info->pending_bh |= BH_RECEIVE;
+}
+
+static void isr_rxdmaerror(SLMP_INFO * info)
+{
+        /* BIT5 = BOF (buffer overflow)
+         * BIT4 = COF (counter overflow)
+         */
+        unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
+
+        /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
+        write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
+                        __FILE__,__LINE__,info->device_name,status);
+
+        info->rx_overflow = true;
+        info->pending_bh |= BH_RECEIVE;
+}
+
+static void isr_txdmaok(SLMP_INFO * info)
+{
+        unsigned char status_reg1 = read_reg(info, SR1);
+
+        write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
+        write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
+        write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
+                        __FILE__,__LINE__,info->device_name,status_reg1);
+
+        /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
+        write_reg16(info, TRC0, 0);
+        info->ie0_value |= TXRDYE;
+        write_reg(info, IE0, info->ie0_value);
+}
+
+static void isr_txdmaerror(SLMP_INFO * info)
+{
+        /* BIT5 = BOF (buffer overflow)
+         * BIT4 = COF (counter overflow)
+         */
+        unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
+
+        /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
+        write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
+                        __FILE__,__LINE__,info->device_name,status);
+}
+
+/* handle input serial signal changes
+ */
+static void isr_io_pin( SLMP_INFO *info, u16 status )
+{
+        struct  mgsl_icount *icount;
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk("%s(%d):isr_io_pin status=%04X\n",
+                        __FILE__,__LINE__,status);
+
+        if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
+                      MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
+                icount = &info->icount;
+                /* update input line counters */
+                if (status & MISCSTATUS_RI_LATCHED) {
+                        icount->rng++;
+                        if ( status & SerialSignal_RI )
+                                info->input_signal_events.ri_up++;
+                        else
+                                info->input_signal_events.ri_down++;
+                }
+                if (status & MISCSTATUS_DSR_LATCHED) {
+                        icount->dsr++;
+                        if ( status & SerialSignal_DSR )
+                                info->input_signal_events.dsr_up++;
+                        else
+                                info->input_signal_events.dsr_down++;
+                }
+                if (status & MISCSTATUS_DCD_LATCHED) {
+                        if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
+                                info->ie1_value &= ~CDCD;
+                                write_reg(info, IE1, info->ie1_value);
+                        }
+                        icount->dcd++;
+                        if (status & SerialSignal_DCD) {
+                                info->input_signal_events.dcd_up++;
+                        } else
+                                info->input_signal_events.dcd_down++;
+#if SYNCLINK_GENERIC_HDLC
+                        if (info->netcount) {
+                                if (status & SerialSignal_DCD)
+                                        netif_carrier_on(info->netdev);
+                                else
+                                        netif_carrier_off(info->netdev);
+                        }
+#endif
+                }
+                if (status & MISCSTATUS_CTS_LATCHED)
+                {
+                        if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
+                                info->ie1_value &= ~CCTS;
+                                write_reg(info, IE1, info->ie1_value);
+                        }
+                        icount->cts++;
+                        if ( status & SerialSignal_CTS )
+                                info->input_signal_events.cts_up++;
+                        else
+                                info->input_signal_events.cts_down++;
+                }
+                wake_up_interruptible(&info->status_event_wait_q);
+                wake_up_interruptible(&info->event_wait_q);
+
+                if ( (info->port.flags & ASYNC_CHECK_CD) &&
+                     (status & MISCSTATUS_DCD_LATCHED) ) {
+                        if ( debug_level >= DEBUG_LEVEL_ISR )
+                                printk("%s CD now %s...", info->device_name,
+                                       (status & SerialSignal_DCD) ? "on" : "off");
+                        if (status & SerialSignal_DCD)
+                                wake_up_interruptible(&info->port.open_wait);
+                        else {
+                                if ( debug_level >= DEBUG_LEVEL_ISR )
+                                        printk("doing serial hangup...");
+                                if (info->port.tty)
+                                        tty_hangup(info->port.tty);
+                        }
+                }
+
+                if ( (info->port.flags & ASYNC_CTS_FLOW) &&
+                     (status & MISCSTATUS_CTS_LATCHED) ) {
+                        if ( info->port.tty ) {
+                                if (info->port.tty->hw_stopped) {
+                                        if (status & SerialSignal_CTS) {
+                                                if ( debug_level >= DEBUG_LEVEL_ISR )
+                                                        printk("CTS tx start...");
+                                                info->port.tty->hw_stopped = 0;
+                                                tx_start(info);
+                                                info->pending_bh |= BH_TRANSMIT;
+                                                return;
+                                        }
+                                } else {
+                                        if (!(status & SerialSignal_CTS)) {
+                                                if ( debug_level >= DEBUG_LEVEL_ISR )
+                                                        printk("CTS tx stop...");
+                                                info->port.tty->hw_stopped = 1;
+                                                tx_stop(info);
+                                        }
+                                }
+                        }
+                }
+        }
+
+        info->pending_bh |= BH_STATUS;
+}
+
+/* Interrupt service routine entry point.
+ *
+ * Arguments:
+ *      irq             interrupt number that caused interrupt
+ *      dev_id          device ID supplied during interrupt registration
+ *      regs            interrupted processor context
+ */
+static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
+{
+        SLMP_INFO *info = dev_id;
+        unsigned char status, status0, status1=0;
+        unsigned char dmastatus, dmastatus0, dmastatus1=0;
+        unsigned char timerstatus0, timerstatus1=0;
+        unsigned char shift;
+        unsigned int i;
+        unsigned short tmp;
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
+                        __FILE__, __LINE__, info->irq_level);
+
+        spin_lock(&info->lock);
+
+        for(;;) {
+
+                /* get status for SCA0 (ports 0-1) */
+                tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
+                status0 = (unsigned char)tmp;
+                dmastatus0 = (unsigned char)(tmp>>8);
+                timerstatus0 = read_reg(info, ISR2);
+
+                if ( debug_level >= DEBUG_LEVEL_ISR )
+                        printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
+                                __FILE__, __LINE__, info->device_name,
+                                status0, dmastatus0, timerstatus0);
+
+                if (info->port_count == 4) {
+                        /* get status for SCA1 (ports 2-3) */
+                        tmp = read_reg16(info->port_array[2], ISR0);
+                        status1 = (unsigned char)tmp;
+                        dmastatus1 = (unsigned char)(tmp>>8);
+                        timerstatus1 = read_reg(info->port_array[2], ISR2);
+
+                        if ( debug_level >= DEBUG_LEVEL_ISR )
+                                printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
+                                        __FILE__,__LINE__,info->device_name,
+                                        status1,dmastatus1,timerstatus1);
+                }
+
+                if (!status0 && !dmastatus0 && !timerstatus0 &&
+                         !status1 && !dmastatus1 && !timerstatus1)
+                        break;
+
+                for(i=0; i < info->port_count ; i++) {
+                        if (info->port_array[i] == NULL)
+                                continue;
+                        if (i < 2) {
+                                status = status0;
+                                dmastatus = dmastatus0;
+                        } else {
+                                status = status1;
+                                dmastatus = dmastatus1;
+                        }
+
+                        shift = i & 1 ? 4 :0;
+
+                        if (status & BIT0 << shift)
+                                isr_rxrdy(info->port_array[i]);
+                        if (status & BIT1 << shift)
+                                isr_txrdy(info->port_array[i]);
+                        if (status & BIT2 << shift)
+                                isr_rxint(info->port_array[i]);
+                        if (status & BIT3 << shift)
+                                isr_txint(info->port_array[i]);
+
+                        if (dmastatus & BIT0 << shift)
+                                isr_rxdmaerror(info->port_array[i]);
+                        if (dmastatus & BIT1 << shift)
+                                isr_rxdmaok(info->port_array[i]);
+                        if (dmastatus & BIT2 << shift)
+                                isr_txdmaerror(info->port_array[i]);
+                        if (dmastatus & BIT3 << shift)
+                                isr_txdmaok(info->port_array[i]);
+                }
+
+                if (timerstatus0 & (BIT5 | BIT4))
+                        isr_timer(info->port_array[0]);
+                if (timerstatus0 & (BIT7 | BIT6))
+                        isr_timer(info->port_array[1]);
+                if (timerstatus1 & (BIT5 | BIT4))
+                        isr_timer(info->port_array[2]);
+                if (timerstatus1 & (BIT7 | BIT6))
+                        isr_timer(info->port_array[3]);
+        }
+
+        for(i=0; i < info->port_count ; i++) {
+                SLMP_INFO * port = info->port_array[i];
+
+                /* Request bottom half processing if there's something
+                 * for it to do and the bh is not already running.
+                 *
+                 * Note: startup adapter diags require interrupts.
+                 * do not request bottom half processing if the
+                 * device is not open in a normal mode.
+                 */
+                if ( port && (port->port.count || port->netcount) &&
+                     port->pending_bh && !port->bh_running &&
+                     !port->bh_requested ) {
+                        if ( debug_level >= DEBUG_LEVEL_ISR )
+                                printk("%s(%d):%s queueing bh task.\n",
+                                        __FILE__,__LINE__,port->device_name);
+                        schedule_work(&port->task);
+                        port->bh_requested = true;
+                }
+        }
+
+        spin_unlock(&info->lock);
+
+        if ( debug_level >= DEBUG_LEVEL_ISR )
+                printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
+                        __FILE__, __LINE__, info->irq_level);
+        return IRQ_HANDLED;
+}
+
+/* Initialize and start device.
+ */
+static int startup(SLMP_INFO * info)
+{
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
+
+        if (info->port.flags & ASYNC_INITIALIZED)
+                return 0;
+
+        if (!info->tx_buf) {
+                info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
+                if (!info->tx_buf) {
+                        printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
+                                __FILE__,__LINE__,info->device_name);
+                        return -ENOMEM;
+                }
+        }
+
+        info->pending_bh = 0;
+
+        memset(&info->icount, 0, sizeof(info->icount));
+
+        /* program hardware for current parameters */
+        reset_port(info);
+
+        change_params(info);
+
+        mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
+
+        if (info->port.tty)
+                clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->port.flags |= ASYNC_INITIALIZED;
+
+        return 0;
+}
+
+/* Called by close() and hangup() to shutdown hardware
+ */
+static void shutdown(SLMP_INFO * info)
+{
+        unsigned long flags;
+
+        if (!(info->port.flags & ASYNC_INITIALIZED))
+                return;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s synclinkmp_shutdown()\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        /* clear status wait queue because status changes */
+        /* can't happen after shutting down the hardware */
+        wake_up_interruptible(&info->status_event_wait_q);
+        wake_up_interruptible(&info->event_wait_q);
+
+        del_timer(&info->tx_timer);
+        del_timer(&info->status_timer);
+
+        kfree(info->tx_buf);
+        info->tx_buf = NULL;
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        reset_port(info);
+
+        if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
+                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                set_signals(info);
+        }
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        if (info->port.tty)
+                set_bit(TTY_IO_ERROR, &info->port.tty->flags);
+
+        info->port.flags &= ~ASYNC_INITIALIZED;
+}
+
+static void program_hw(SLMP_INFO *info)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        rx_stop(info);
+        tx_stop(info);
+
+        info->tx_count = info->tx_put = info->tx_get = 0;
+
+        if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
+                hdlc_mode(info);
+        else
+                async_mode(info);
+
+        set_signals(info);
+
+        info->dcd_chkcount = 0;
+        info->cts_chkcount = 0;
+        info->ri_chkcount = 0;
+        info->dsr_chkcount = 0;
+
+        info->ie1_value |= (CDCD|CCTS);
+        write_reg(info, IE1, info->ie1_value);
+
+        get_signals(info);
+
+        if (info->netcount || (info->port.tty && info->port.tty->termios->c_cflag & CREAD) )
+                rx_start(info);
+
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+/* Reconfigure adapter based on new parameters
+ */
+static void change_params(SLMP_INFO *info)
+{
+        unsigned cflag;
+        int bits_per_char;
+
+        if (!info->port.tty || !info->port.tty->termios)
+                return;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s change_params()\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        cflag = info->port.tty->termios->c_cflag;
+
+        /* if B0 rate (hangup) specified then negate DTR and RTS */
+        /* otherwise assert DTR and RTS */
+        if (cflag & CBAUD)
+                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        else
+                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+
+        /* byte size and parity */
+
+        switch (cflag & CSIZE) {
+              case CS5: info->params.data_bits = 5; break;
+              case CS6: info->params.data_bits = 6; break;
+              case CS7: info->params.data_bits = 7; break;
+              case CS8: info->params.data_bits = 8; break;
+              /* Never happens, but GCC is too dumb to figure it out */
+              default:  info->params.data_bits = 7; break;
+              }
+
+        if (cflag & CSTOPB)
+                info->params.stop_bits = 2;
+        else
+                info->params.stop_bits = 1;
+
+        info->params.parity = ASYNC_PARITY_NONE;
+        if (cflag & PARENB) {
+                if (cflag & PARODD)
+                        info->params.parity = ASYNC_PARITY_ODD;
+                else
+                        info->params.parity = ASYNC_PARITY_EVEN;
+#ifdef CMSPAR
+                if (cflag & CMSPAR)
+                        info->params.parity = ASYNC_PARITY_SPACE;
+#endif
+        }
+
+        /* calculate number of jiffies to transmit a full
+         * FIFO (32 bytes) at specified data rate
+         */
+        bits_per_char = info->params.data_bits +
+                        info->params.stop_bits + 1;
+
+        /* if port data rate is set to 460800 or less then
+         * allow tty settings to override, otherwise keep the
+         * current data rate.
+         */
+        if (info->params.data_rate <= 460800) {
+                info->params.data_rate = tty_get_baud_rate(info->port.tty);
+        }
+
+        if ( info->params.data_rate ) {
+                info->timeout = (32*HZ*bits_per_char) /
+                                info->params.data_rate;
+        }
+        info->timeout += HZ/50;         /* Add .02 seconds of slop */
+
+        if (cflag & CRTSCTS)
+                info->port.flags |= ASYNC_CTS_FLOW;
+        else
+                info->port.flags &= ~ASYNC_CTS_FLOW;
+
+        if (cflag & CLOCAL)
+                info->port.flags &= ~ASYNC_CHECK_CD;
+        else
+                info->port.flags |= ASYNC_CHECK_CD;
+
+        /* process tty input control flags */
+
+        info->read_status_mask2 = OVRN;
+        if (I_INPCK(info->port.tty))
+                info->read_status_mask2 |= PE | FRME;
+        if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
+                info->read_status_mask1 |= BRKD;
+        if (I_IGNPAR(info->port.tty))
+                info->ignore_status_mask2 |= PE | FRME;
+        if (I_IGNBRK(info->port.tty)) {
+                info->ignore_status_mask1 |= BRKD;
+                /* If ignoring parity and break indicators, ignore
+                 * overruns too.  (For real raw support).
+                 */
+                if (I_IGNPAR(info->port.tty))
+                        info->ignore_status_mask2 |= OVRN;
+        }
+
+        program_hw(info);
+}
+
+static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
+{
+        int err;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s get_params()\n",
+                         __FILE__,__LINE__, info->device_name);
+
+        if (!user_icount) {
+                memset(&info->icount, 0, sizeof(info->icount));
+        } else {
+                mutex_lock(&info->port.mutex);
+                COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
+                mutex_unlock(&info->port.mutex);
+                if (err)
+                        return -EFAULT;
+        }
+
+        return 0;
+}
+
+static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
+{
+        int err;
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s get_params()\n",
+                         __FILE__,__LINE__, info->device_name);
+
+        mutex_lock(&info->port.mutex);
+        COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
+        mutex_unlock(&info->port.mutex);
+        if (err) {
+                if ( debug_level >= DEBUG_LEVEL_INFO )
+                        printk( "%s(%d):%s get_params() user buffer copy failed\n",
+                                __FILE__,__LINE__,info->device_name);
+                return -EFAULT;
+        }
+
+        return 0;
+}
+
+static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
+{
+        unsigned long flags;
+        MGSL_PARAMS tmp_params;
+        int err;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s set_params\n",
+                        __FILE__,__LINE__,info->device_name );
+        COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
+        if (err) {
+                if ( debug_level >= DEBUG_LEVEL_INFO )
+                        printk( "%s(%d):%s set_params() user buffer copy failed\n",
+                                __FILE__,__LINE__,info->device_name);
+                return -EFAULT;
+        }
+
+        mutex_lock(&info->port.mutex);
+        spin_lock_irqsave(&info->lock,flags);
+        memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        change_params(info);
+        mutex_unlock(&info->port.mutex);
+
+        return 0;
+}
+
+static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
+{
+        int err;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s get_txidle()=%d\n",
+                         __FILE__,__LINE__, info->device_name, info->idle_mode);
+
+        COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
+        if (err) {
+                if ( debug_level >= DEBUG_LEVEL_INFO )
+                        printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
+                                __FILE__,__LINE__,info->device_name);
+                return -EFAULT;
+        }
+
+        return 0;
+}
+
+static int set_txidle(SLMP_INFO * info, int idle_mode)
+{
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s set_txidle(%d)\n",
+                        __FILE__,__LINE__,info->device_name, idle_mode );
+
+        spin_lock_irqsave(&info->lock,flags);
+        info->idle_mode = idle_mode;
+        tx_set_idle( info );
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+static int tx_enable(SLMP_INFO * info, int enable)
+{
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s tx_enable(%d)\n",
+                        __FILE__,__LINE__,info->device_name, enable);
+
+        spin_lock_irqsave(&info->lock,flags);
+        if ( enable ) {
+                if ( !info->tx_enabled ) {
+                        tx_start(info);
+                }
+        } else {
+                if ( info->tx_enabled )
+                        tx_stop(info);
+        }
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+/* abort send HDLC frame
+ */
+static int tx_abort(SLMP_INFO * info)
+{
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s tx_abort()\n",
+                        __FILE__,__LINE__,info->device_name);
+
+        spin_lock_irqsave(&info->lock,flags);
+        if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
+                info->ie1_value &= ~UDRN;
+                info->ie1_value |= IDLE;
+                write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
+                write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
+
+                write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
+                write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
+
+                write_reg(info, CMD, TXABORT);
+        }
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+static int rx_enable(SLMP_INFO * info, int enable)
+{
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s rx_enable(%d)\n",
+                        __FILE__,__LINE__,info->device_name,enable);
+
+        spin_lock_irqsave(&info->lock,flags);
+        if ( enable ) {
+                if ( !info->rx_enabled )
+                        rx_start(info);
+        } else {
+                if ( info->rx_enabled )
+                        rx_stop(info);
+        }
+        spin_unlock_irqrestore(&info->lock,flags);
+        return 0;
+}
+
+/* wait for specified event to occur
+ */
+static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
+{
+        unsigned long flags;
+        int s;
+        int rc=0;
+        struct mgsl_icount cprev, cnow;
+        int events;
+        int mask;
+        struct  _input_signal_events oldsigs, newsigs;
+        DECLARE_WAITQUEUE(wait, current);
+
+        COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
+        if (rc) {
+                return  -EFAULT;
+        }
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s wait_mgsl_event(%d)\n",
+                        __FILE__,__LINE__,info->device_name,mask);
+
+        spin_lock_irqsave(&info->lock,flags);
+
+        /* return immediately if state matches requested events */
+        get_signals(info);
+        s = info->serial_signals;
+
+        events = mask &
+                ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
+                  ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
+                  ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
+                  ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
+        if (events) {
+                spin_unlock_irqrestore(&info->lock,flags);
+                goto exit;
+        }
+
+        /* save current irq counts */
+        cprev = info->icount;
+        oldsigs = info->input_signal_events;
+
+        /* enable hunt and idle irqs if needed */
+        if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
+                unsigned char oldval = info->ie1_value;
+                unsigned char newval = oldval +
+                         (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
+                         (mask & MgslEvent_IdleReceived ? IDLD:0);
+                if ( oldval != newval ) {
+                        info->ie1_value = newval;
+                        write_reg(info, IE1, info->ie1_value);
+                }
+        }
+
+        set_current_state(TASK_INTERRUPTIBLE);
+        add_wait_queue(&info->event_wait_q, &wait);
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        for(;;) {
+                schedule();
+                if (signal_pending(current)) {
+                        rc = -ERESTARTSYS;
+                        break;
+                }
+
+                /* get current irq counts */
+                spin_lock_irqsave(&info->lock,flags);
+                cnow = info->icount;
+                newsigs = info->input_signal_events;
+                set_current_state(TASK_INTERRUPTIBLE);
+                spin_unlock_irqrestore(&info->lock,flags);
+
+                /* if no change, wait aborted for some reason */
+                if (newsigs.dsr_up   == oldsigs.dsr_up   &&
+                    newsigs.dsr_down == oldsigs.dsr_down &&
+                    newsigs.dcd_up   == oldsigs.dcd_up   &&
+                    newsigs.dcd_down == oldsigs.dcd_down &&
+                    newsigs.cts_up   == oldsigs.cts_up   &&
+                    newsigs.cts_down == oldsigs.cts_down &&
+                    newsigs.ri_up    == oldsigs.ri_up    &&
+                    newsigs.ri_down  == oldsigs.ri_down  &&
+                    cnow.exithunt    == cprev.exithunt   &&
+                    cnow.rxidle      == cprev.rxidle) {
+                        rc = -EIO;
+                        break;
+                }
+
+                events = mask &
+                        ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
+                          (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
+                          (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
+                          (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
+                          (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
+                          (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
+                          (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
+                          (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
+                          (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
+                          (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
+                if (events)
+                        break;
+
+                cprev = cnow;
+                oldsigs = newsigs;
+        }
+
+        remove_wait_queue(&info->event_wait_q, &wait);
+        set_current_state(TASK_RUNNING);
+
+
+        if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
+                spin_lock_irqsave(&info->lock,flags);
+                if (!waitqueue_active(&info->event_wait_q)) {
+                        /* disable enable exit hunt mode/idle rcvd IRQs */
+                        info->ie1_value &= ~(FLGD|IDLD);
+                        write_reg(info, IE1, info->ie1_value);
+                }
+                spin_unlock_irqrestore(&info->lock,flags);
+        }
+exit:
+        if ( rc == 0 )
+                PUT_USER(rc, events, mask_ptr);
+
+        return rc;
+}
+
+static int modem_input_wait(SLMP_INFO *info,int arg)
+{
+        unsigned long flags;
+        int rc;
+        struct mgsl_icount cprev, cnow;
+        DECLARE_WAITQUEUE(wait, current);
+
+        /* save current irq counts */
+        spin_lock_irqsave(&info->lock,flags);
+        cprev = info->icount;
+        add_wait_queue(&info->status_event_wait_q, &wait);
+        set_current_state(TASK_INTERRUPTIBLE);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        for(;;) {
+                schedule();
+                if (signal_pending(current)) {
+                        rc = -ERESTARTSYS;
+                        break;
+                }
+
+                /* get new irq counts */
+                spin_lock_irqsave(&info->lock,flags);
+                cnow = info->icount;
+                set_current_state(TASK_INTERRUPTIBLE);
+                spin_unlock_irqrestore(&info->lock,flags);
+
+                /* if no change, wait aborted for some reason */
+                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
+                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
+                        rc = -EIO;
+                        break;
+                }
+
+                /* check for change in caller specified modem input */
+                if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
+                    (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
+                    (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
+                    (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
+                        rc = 0;
+                        break;
+                }
+
+                cprev = cnow;
+        }
+        remove_wait_queue(&info->status_event_wait_q, &wait);
+        set_current_state(TASK_RUNNING);
+        return rc;
+}
+
+/* return the state of the serial control and status signals
+ */
+static int tiocmget(struct tty_struct *tty)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned int result;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
+                ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
+                ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
+                ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
+                ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
+                ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s tiocmget() value=%08X\n",
+                         __FILE__,__LINE__, info->device_name, result );
+        return result;
+}
+
+/* set modem control signals (DTR/RTS)
+ */
+static int tiocmset(struct tty_struct *tty,
+                                        unsigned int set, unsigned int clear)
+{
+        SLMP_INFO *info = tty->driver_data;
+        unsigned long flags;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s tiocmset(%x,%x)\n",
+                        __FILE__,__LINE__,info->device_name, set, clear);
+
+        if (set & TIOCM_RTS)
+                info->serial_signals |= SerialSignal_RTS;
+        if (set & TIOCM_DTR)
+                info->serial_signals |= SerialSignal_DTR;
+        if (clear & TIOCM_RTS)
+                info->serial_signals &= ~SerialSignal_RTS;
+        if (clear & TIOCM_DTR)
+                info->serial_signals &= ~SerialSignal_DTR;
+
+        spin_lock_irqsave(&info->lock,flags);
+        set_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        return 0;
+}
+
+static int carrier_raised(struct tty_port *port)
+{
+        SLMP_INFO *info = container_of(port, SLMP_INFO, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
+}
+
+static void dtr_rts(struct tty_port *port, int on)
+{
+        SLMP_INFO *info = container_of(port, SLMP_INFO, port);
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+        if (on)
+                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+        else
+                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
+        set_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+}
+
+/* Block the current process until the specified port is ready to open.
+ */
+static int block_til_ready(struct tty_struct *tty, struct file *filp,
+                           SLMP_INFO *info)
+{
+        DECLARE_WAITQUEUE(wait, current);
+        int             retval;
+        bool            do_clocal = false;
+        bool            extra_count = false;
+        unsigned long   flags;
+        int             cd;
+        struct tty_port *port = &info->port;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s block_til_ready()\n",
+                         __FILE__,__LINE__, tty->driver->name );
+
+        if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
+                /* nonblock mode is set or port is not enabled */
+                /* just verify that callout device is not active */
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (tty->termios->c_cflag & CLOCAL)
+                do_clocal = true;
+
+        /* Wait for carrier detect and the line to become
+         * free (i.e., not in use by the callout).  While we are in
+         * this loop, port->count is dropped by one, so that
+         * close() knows when to free things.  We restore it upon
+         * exit, either normal or abnormal.
+         */
+
+        retval = 0;
+        add_wait_queue(&port->open_wait, &wait);
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s block_til_ready() before block, count=%d\n",
+                         __FILE__,__LINE__, tty->driver->name, port->count );
+
+        spin_lock_irqsave(&info->lock, flags);
+        if (!tty_hung_up_p(filp)) {
+                extra_count = true;
+                port->count--;
+        }
+        spin_unlock_irqrestore(&info->lock, flags);
+        port->blocked_open++;
+
+        while (1) {
+                if (tty->termios->c_cflag & CBAUD)
+                        tty_port_raise_dtr_rts(port);
+
+                set_current_state(TASK_INTERRUPTIBLE);
+
+                if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
+                        retval = (port->flags & ASYNC_HUP_NOTIFY) ?
+                                        -EAGAIN : -ERESTARTSYS;
+                        break;
+                }
+
+                cd = tty_port_carrier_raised(port);
+
+                if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
+                        break;
+
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+
+                if (debug_level >= DEBUG_LEVEL_INFO)
+                        printk("%s(%d):%s block_til_ready() count=%d\n",
+                                 __FILE__,__LINE__, tty->driver->name, port->count );
+
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+
+        set_current_state(TASK_RUNNING);
+        remove_wait_queue(&port->open_wait, &wait);
+
+        if (extra_count)
+                port->count++;
+        port->blocked_open--;
+
+        if (debug_level >= DEBUG_LEVEL_INFO)
+                printk("%s(%d):%s block_til_ready() after, count=%d\n",
+                         __FILE__,__LINE__, tty->driver->name, port->count );
+
+        if (!retval)
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+
+        return retval;
+}
+
+static int alloc_dma_bufs(SLMP_INFO *info)
+{
+        unsigned short BuffersPerFrame;
+        unsigned short BufferCount;
+
+        // Force allocation to start at 64K boundary for each port.
+        // This is necessary because *all* buffer descriptors for a port
+        // *must* be in the same 64K block. All descriptors on a port
+        // share a common 'base' address (upper 8 bits of 24 bits) programmed
+        // into the CBP register.
+        info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
+
+        /* Calculate the number of DMA buffers necessary to hold the */
+        /* largest allowable frame size. Note: If the max frame size is */
+        /* not an even multiple of the DMA buffer size then we need to */
+        /* round the buffer count per frame up one. */
+
+        BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
+        if ( info->max_frame_size % SCABUFSIZE )
+                BuffersPerFrame++;
+
+        /* calculate total number of data buffers (SCABUFSIZE) possible
+         * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
+         * for the descriptor list (BUFFERLISTSIZE).
+         */
+        BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
+
+        /* limit number of buffers to maximum amount of descriptors */
+        if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
+                BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
+
+        /* use enough buffers to transmit one max size frame */
+        info->tx_buf_count = BuffersPerFrame + 1;
+
+        /* never use more than half the available buffers for transmit */
+        if (info->tx_buf_count > (BufferCount/2))
+                info->tx_buf_count = BufferCount/2;
+
+        if (info->tx_buf_count > SCAMAXDESC)
+                info->tx_buf_count = SCAMAXDESC;
+
+        /* use remaining buffers for receive */
+        info->rx_buf_count = BufferCount - info->tx_buf_count;
+
+        if (info->rx_buf_count > SCAMAXDESC)
+                info->rx_buf_count = SCAMAXDESC;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
+                        __FILE__,__LINE__, info->device_name,
+                        info->tx_buf_count,info->rx_buf_count);
+
+        if ( alloc_buf_list( info ) < 0 ||
+                alloc_frame_bufs(info,
+                                        info->rx_buf_list,
+                                        info->rx_buf_list_ex,
+                                        info->rx_buf_count) < 0 ||
+                alloc_frame_bufs(info,
+                                        info->tx_buf_list,
+                                        info->tx_buf_list_ex,
+                                        info->tx_buf_count) < 0 ||
+                alloc_tmp_rx_buf(info) < 0 ) {
+                printk("%s(%d):%s Can't allocate DMA buffer memory\n",
+                        __FILE__,__LINE__, info->device_name);
+                return -ENOMEM;
+        }
+
+        rx_reset_buffers( info );
+
+        return 0;
+}
+
+/* Allocate DMA buffers for the transmit and receive descriptor lists.
+ */
+static int alloc_buf_list(SLMP_INFO *info)
+{
+        unsigned int i;
+
+        /* build list in adapter shared memory */
+        info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
+        info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
+        info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
+
+        memset(info->buffer_list, 0, BUFFERLISTSIZE);
+
+        /* Save virtual address pointers to the receive and */
+        /* transmit buffer lists. (Receive 1st). These pointers will */
+        /* be used by the processor to access the lists. */
+        info->rx_buf_list = (SCADESC *)info->buffer_list;
+
+        info->tx_buf_list = (SCADESC *)info->buffer_list;
+        info->tx_buf_list += info->rx_buf_count;
+
+        /* Build links for circular buffer entry lists (tx and rx)
+         *
+         * Note: links are physical addresses read by the SCA device
+         * to determine the next buffer entry to use.
+         */
+
+        for ( i = 0; i < info->rx_buf_count; i++ ) {
+                /* calculate and store physical address of this buffer entry */
+                info->rx_buf_list_ex[i].phys_entry =
+                        info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
+
+                /* calculate and store physical address of */
+                /* next entry in cirular list of entries */
+                info->rx_buf_list[i].next = info->buffer_list_phys;
+                if ( i < info->rx_buf_count - 1 )
+                        info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
+
+                info->rx_buf_list[i].length = SCABUFSIZE;
+        }
+
+        for ( i = 0; i < info->tx_buf_count; i++ ) {
+                /* calculate and store physical address of this buffer entry */
+                info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
+                        ((info->rx_buf_count + i) * sizeof(SCADESC));
+
+                /* calculate and store physical address of */
+                /* next entry in cirular list of entries */
+
+                info->tx_buf_list[i].next = info->buffer_list_phys +
+                        info->rx_buf_count * sizeof(SCADESC);
+
+                if ( i < info->tx_buf_count - 1 )
+                        info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
+        }
+
+        return 0;
+}
+
+/* Allocate the frame DMA buffers used by the specified buffer list.
+ */
+static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
+{
+        int i;
+        unsigned long phys_addr;
+
+        for ( i = 0; i < count; i++ ) {
+                buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
+                phys_addr = info->port_array[0]->last_mem_alloc;
+                info->port_array[0]->last_mem_alloc += SCABUFSIZE;
+
+                buf_list[i].buf_ptr  = (unsigned short)phys_addr;
+                buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
+        }
+
+        return 0;
+}
+
+static void free_dma_bufs(SLMP_INFO *info)
+{
+        info->buffer_list = NULL;
+        info->rx_buf_list = NULL;
+        info->tx_buf_list = NULL;
+}
+
+/* allocate buffer large enough to hold max_frame_size.
+ * This buffer is used to pass an assembled frame to the line discipline.
+ */
+static int alloc_tmp_rx_buf(SLMP_INFO *info)
+{
+        info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
+        if (info->tmp_rx_buf == NULL)
+                return -ENOMEM;
+        return 0;
+}
+
+static void free_tmp_rx_buf(SLMP_INFO *info)
+{
+        kfree(info->tmp_rx_buf);
+        info->tmp_rx_buf = NULL;
+}
+
+static int claim_resources(SLMP_INFO *info)
+{
+        if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
+                printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_memory_base);
+                info->init_error = DiagStatus_AddressConflict;
+                goto errout;
+        }
+        else
+                info->shared_mem_requested = true;
+
+        if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
+                printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
+                info->init_error = DiagStatus_AddressConflict;
+                goto errout;
+        }
+        else
+                info->lcr_mem_requested = true;
+
+        if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
+                printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_sca_base);
+                info->init_error = DiagStatus_AddressConflict;
+                goto errout;
+        }
+        else
+                info->sca_base_requested = true;
+
+        if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
+                printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
+                info->init_error = DiagStatus_AddressConflict;
+                goto errout;
+        }
+        else
+                info->sca_statctrl_requested = true;
+
+        info->memory_base = ioremap_nocache(info->phys_memory_base,
+                                                                SCA_MEM_SIZE);
+        if (!info->memory_base) {
+                printk( "%s(%d):%s Can't map shared memory, MemAddr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_memory_base );
+                info->init_error = DiagStatus_CantAssignPciResources;
+                goto errout;
+        }
+
+        info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
+        if (!info->lcr_base) {
+                printk( "%s(%d):%s Can't map LCR memory, MemAddr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
+                info->init_error = DiagStatus_CantAssignPciResources;
+                goto errout;
+        }
+        info->lcr_base += info->lcr_offset;
+
+        info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
+        if (!info->sca_base) {
+                printk( "%s(%d):%s Can't map SCA memory, MemAddr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_sca_base );
+                info->init_error = DiagStatus_CantAssignPciResources;
+                goto errout;
+        }
+        info->sca_base += info->sca_offset;
+
+        info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
+                                                                PAGE_SIZE);
+        if (!info->statctrl_base) {
+                printk( "%s(%d):%s Can't map SCA Status/Control memory, MemAddr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
+                info->init_error = DiagStatus_CantAssignPciResources;
+                goto errout;
+        }
+        info->statctrl_base += info->statctrl_offset;
+
+        if ( !memory_test(info) ) {
+                printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
+                        __FILE__,__LINE__,info->device_name, info->phys_memory_base );
+                info->init_error = DiagStatus_MemoryError;
+                goto errout;
+        }
+
+        return 0;
+
+errout:
+        release_resources( info );
+        return -ENODEV;
+}
+
+static void release_resources(SLMP_INFO *info)
+{
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):%s release_resources() entry\n",
+                        __FILE__,__LINE__,info->device_name );
+
+        if ( info->irq_requested ) {
+                free_irq(info->irq_level, info);
+                info->irq_requested = false;
+        }
+
+        if ( info->shared_mem_requested ) {
+                release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
+                info->shared_mem_requested = false;
+        }
+        if ( info->lcr_mem_requested ) {
+                release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
+                info->lcr_mem_requested = false;
+        }
+        if ( info->sca_base_requested ) {
+                release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
+                info->sca_base_requested = false;
+        }
+        if ( info->sca_statctrl_requested ) {
+                release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
+                info->sca_statctrl_requested = false;
+        }
+
+        if (info->memory_base){
+                iounmap(info->memory_base);
+                info->memory_base = NULL;
+        }
+
+        if (info->sca_base) {
+                iounmap(info->sca_base - info->sca_offset);
+                info->sca_base=NULL;
+        }
+
+        if (info->statctrl_base) {
+                iounmap(info->statctrl_base - info->statctrl_offset);
+                info->statctrl_base=NULL;
+        }
+
+        if (info->lcr_base){
+                iounmap(info->lcr_base - info->lcr_offset);
+                info->lcr_base = NULL;
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):%s release_resources() exit\n",
+                        __FILE__,__LINE__,info->device_name );
+}
+
+/* Add the specified device instance data structure to the
+ * global linked list of devices and increment the device count.
+ */
+static void add_device(SLMP_INFO *info)
+{
+        info->next_device = NULL;
+        info->line = synclinkmp_device_count;
+        sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
+
+        if (info->line < MAX_DEVICES) {
+                if (maxframe[info->line])
+                        info->max_frame_size = maxframe[info->line];
+        }
+
+        synclinkmp_device_count++;
+
+        if ( !synclinkmp_device_list )
+                synclinkmp_device_list = info;
+        else {
+                SLMP_INFO *current_dev = synclinkmp_device_list;
+                while( current_dev->next_device )
+                        current_dev = current_dev->next_device;
+                current_dev->next_device = info;
+        }
+
+        if ( info->max_frame_size < 4096 )
+                info->max_frame_size = 4096;
+        else if ( info->max_frame_size > 65535 )
+                info->max_frame_size = 65535;
+
+        printk( "SyncLink MultiPort %s: "
+                "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
+                info->device_name,
+                info->phys_sca_base,
+                info->phys_memory_base,
+                info->phys_statctrl_base,
+                info->phys_lcr_base,
+                info->irq_level,
+                info->max_frame_size );
+
+#if SYNCLINK_GENERIC_HDLC
+        hdlcdev_init(info);
+#endif
+}
+
+static const struct tty_port_operations port_ops = {
+        .carrier_raised = carrier_raised,
+        .dtr_rts = dtr_rts,
+};
+
+/* Allocate and initialize a device instance structure
+ *
+ * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
+ */
+static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
+{
+        SLMP_INFO *info;
+
+        info = kzalloc(sizeof(SLMP_INFO),
+                 GFP_KERNEL);
+
+        if (!info) {
+                printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
+                        __FILE__,__LINE__, adapter_num, port_num);
+        } else {
+                tty_port_init(&info->port);
+                info->port.ops = &port_ops;
+                info->magic = MGSL_MAGIC;
+                INIT_WORK(&info->task, bh_handler);
+                info->max_frame_size = 4096;
+                info->port.close_delay = 5*HZ/10;
+                info->port.closing_wait = 30*HZ;
+                init_waitqueue_head(&info->status_event_wait_q);
+                init_waitqueue_head(&info->event_wait_q);
+                spin_lock_init(&info->netlock);
+                memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
+                info->idle_mode = HDLC_TXIDLE_FLAGS;
+                info->adapter_num = adapter_num;
+                info->port_num = port_num;
+
+                /* Copy configuration info to device instance data */
+                info->irq_level = pdev->irq;
+                info->phys_lcr_base = pci_resource_start(pdev,0);
+                info->phys_sca_base = pci_resource_start(pdev,2);
+                info->phys_memory_base = pci_resource_start(pdev,3);
+                info->phys_statctrl_base = pci_resource_start(pdev,4);
+
+                /* Because veremap only works on page boundaries we must map
+                 * a larger area than is actually implemented for the LCR
+                 * memory range. We map a full page starting at the page boundary.
+                 */
+                info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
+                info->phys_lcr_base &= ~(PAGE_SIZE-1);
+
+                info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
+                info->phys_sca_base &= ~(PAGE_SIZE-1);
+
+                info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
+                info->phys_statctrl_base &= ~(PAGE_SIZE-1);
+
+                info->bus_type = MGSL_BUS_TYPE_PCI;
+                info->irq_flags = IRQF_SHARED;
+
+                setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
+                setup_timer(&info->status_timer, status_timeout,
+                                (unsigned long)info);
+
+                /* Store the PCI9050 misc control register value because a flaw
+                 * in the PCI9050 prevents LCR registers from being read if
+                 * BIOS assigns an LCR base address with bit 7 set.
+                 *
+                 * Only the misc control register is accessed for which only
+                 * write access is needed, so set an initial value and change
+                 * bits to the device instance data as we write the value
+                 * to the actual misc control register.
+                 */
+                info->misc_ctrl_value = 0x087e4546;
+
+                /* initial port state is unknown - if startup errors
+                 * occur, init_error will be set to indicate the
+                 * problem. Once the port is fully initialized,
+                 * this value will be set to 0 to indicate the
+                 * port is available.
+                 */
+                info->init_error = -1;
+        }
+
+        return info;
+}
+
+static void device_init(int adapter_num, struct pci_dev *pdev)
+{
+        SLMP_INFO *port_array[SCA_MAX_PORTS];
+        int port;
+
+        /* allocate device instances for up to SCA_MAX_PORTS devices */
+        for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
+                port_array[port] = alloc_dev(adapter_num,port,pdev);
+                if( port_array[port] == NULL ) {
+                        for ( --port; port >= 0; --port )
+                                kfree(port_array[port]);
+                        return;
+                }
+        }
+
+        /* give copy of port_array to all ports and add to device list  */
+        for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
+                memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
+                add_device( port_array[port] );
+                spin_lock_init(&port_array[port]->lock);
+        }
+
+        /* Allocate and claim adapter resources */
+        if ( !claim_resources(port_array[0]) ) {
+
+                alloc_dma_bufs(port_array[0]);
+
+                /* copy resource information from first port to others */
+                for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
+                        port_array[port]->lock  = port_array[0]->lock;
+                        port_array[port]->irq_level     = port_array[0]->irq_level;
+                        port_array[port]->memory_base   = port_array[0]->memory_base;
+                        port_array[port]->sca_base      = port_array[0]->sca_base;
+                        port_array[port]->statctrl_base = port_array[0]->statctrl_base;
+                        port_array[port]->lcr_base      = port_array[0]->lcr_base;
+                        alloc_dma_bufs(port_array[port]);
+                }
+
+                if ( request_irq(port_array[0]->irq_level,
+                                        synclinkmp_interrupt,
+                                        port_array[0]->irq_flags,
+                                        port_array[0]->device_name,
+                                        port_array[0]) < 0 ) {
+                        printk( "%s(%d):%s Can't request interrupt, IRQ=%d\n",
+                                __FILE__,__LINE__,
+                                port_array[0]->device_name,
+                                port_array[0]->irq_level );
+                }
+                else {
+                        port_array[0]->irq_requested = true;
+                        adapter_test(port_array[0]);
+                }
+        }
+}
+
+static const struct tty_operations ops = {
+        .open = open,
+        .close = close,
+        .write = write,
+        .put_char = put_char,
+        .flush_chars = flush_chars,
+        .write_room = write_room,
+        .chars_in_buffer = chars_in_buffer,
+        .flush_buffer = flush_buffer,
+        .ioctl = ioctl,
+        .throttle = throttle,
+        .unthrottle = unthrottle,
+        .send_xchar = send_xchar,
+        .break_ctl = set_break,
+        .wait_until_sent = wait_until_sent,
+        .set_termios = set_termios,
+        .stop = tx_hold,
+        .start = tx_release,
+        .hangup = hangup,
+        .tiocmget = tiocmget,
+        .tiocmset = tiocmset,
+        .get_icount = get_icount,
+        .proc_fops = &synclinkmp_proc_fops,
+};
+
+
+static void synclinkmp_cleanup(void)
+{
+        int rc;
+        SLMP_INFO *info;
+        SLMP_INFO *tmp;
+
+        printk("Unloading %s %s\n", driver_name, driver_version);
+
+        if (serial_driver) {
+                if ((rc = tty_unregister_driver(serial_driver)))
+                        printk("%s(%d) failed to unregister tty driver err=%d\n",
+                               __FILE__,__LINE__,rc);
+                put_tty_driver(serial_driver);
+        }
+
+        /* reset devices */
+        info = synclinkmp_device_list;
+        while(info) {
+                reset_port(info);
+                info = info->next_device;
+        }
+
+        /* release devices */
+        info = synclinkmp_device_list;
+        while(info) {
+#if SYNCLINK_GENERIC_HDLC
+                hdlcdev_exit(info);
+#endif
+                free_dma_bufs(info);
+                free_tmp_rx_buf(info);
+                if ( info->port_num == 0 ) {
+                        if (info->sca_base)
+                                write_reg(info, LPR, 1); /* set low power mode */
+                        release_resources(info);
+                }
+                tmp = info;
+                info = info->next_device;
+                kfree(tmp);
+        }
+
+        pci_unregister_driver(&synclinkmp_pci_driver);
+}
+
+/* Driver initialization entry point.
+ */
+
+static int __init synclinkmp_init(void)
+{
+        int rc;
+
+        if (break_on_load) {
+                synclinkmp_get_text_ptr();
+                BREAKPOINT();
+        }
+
+        printk("%s %s\n", driver_name, driver_version);
+
+        if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
+                printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
+                return rc;
+        }
+
+        serial_driver = alloc_tty_driver(128);
+        if (!serial_driver) {
+                rc = -ENOMEM;
+                goto error;
+        }
+
+        /* Initialize the tty_driver structure */
+
+        serial_driver->owner = THIS_MODULE;
+        serial_driver->driver_name = "synclinkmp";
+        serial_driver->name = "ttySLM";
+        serial_driver->major = ttymajor;
+        serial_driver->minor_start = 64;
+        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
+        serial_driver->subtype = SERIAL_TYPE_NORMAL;
+        serial_driver->init_termios = tty_std_termios;
+        serial_driver->init_termios.c_cflag =
+                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        serial_driver->init_termios.c_ispeed = 9600;
+        serial_driver->init_termios.c_ospeed = 9600;
+        serial_driver->flags = TTY_DRIVER_REAL_RAW;
+        tty_set_operations(serial_driver, &ops);
+        if ((rc = tty_register_driver(serial_driver)) < 0) {
+                printk("%s(%d):Couldn't register serial driver\n",
+                        __FILE__,__LINE__);
+                put_tty_driver(serial_driver);
+                serial_driver = NULL;
+                goto error;
+        }
+
+        printk("%s %s, tty major#%d\n",
+                driver_name, driver_version,
+                serial_driver->major);
+
+        return 0;
+
+error:
+        synclinkmp_cleanup();
+        return rc;
+}
+
+static void __exit synclinkmp_exit(void)
+{
+        synclinkmp_cleanup();
+}
+
+module_init(synclinkmp_init);
+module_exit(synclinkmp_exit);
+
+/* Set the port for internal loopback mode.
+ * The TxCLK and RxCLK signals are generated from the BRG and
+ * the TxD is looped back to the RxD internally.
+ */
+static void enable_loopback(SLMP_INFO *info, int enable)
+{
+        if (enable) {
+                /* MD2 (Mode Register 2)
+                 * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
+                 */
+                write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
+
+                /* degate external TxC clock source */
+                info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
+                write_control_reg(info);
+
+                /* RXS/TXS (Rx/Tx clock source)
+                 * 07      Reserved, must be 0
+                 * 06..04  Clock Source, 100=BRG
+                 * 03..00  Clock Divisor, 0000=1
+                 */
+                write_reg(info, RXS, 0x40);
+                write_reg(info, TXS, 0x40);
+
+        } else {
+                /* MD2 (Mode Register 2)
+                 * 01..00  CNCT<1..0> Channel connection, 0=normal
+                 */
+                write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
+
+                /* RXS/TXS (Rx/Tx clock source)
+                 * 07      Reserved, must be 0
+                 * 06..04  Clock Source, 000=RxC/TxC Pin
+                 * 03..00  Clock Divisor, 0000=1
+                 */
+                write_reg(info, RXS, 0x00);
+                write_reg(info, TXS, 0x00);
+        }
+
+        /* set LinkSpeed if available, otherwise default to 2Mbps */
+        if (info->params.clock_speed)
+                set_rate(info, info->params.clock_speed);
+        else
+                set_rate(info, 3686400);
+}
+
+/* Set the baud rate register to the desired speed
+ *
+ *      data_rate       data rate of clock in bits per second
+ *                      A data rate of 0 disables the AUX clock.
+ */
+static void set_rate( SLMP_INFO *info, u32 data_rate )
+{
+        u32 TMCValue;
+        unsigned char BRValue;
+        u32 Divisor=0;
+
+        /* fBRG = fCLK/(TMC * 2^BR)
+         */
+        if (data_rate != 0) {
+                Divisor = 14745600/data_rate;
+                if (!Divisor)
+                        Divisor = 1;
+
+                TMCValue = Divisor;
+
+                BRValue = 0;
+                if (TMCValue != 1 && TMCValue != 2) {
+                        /* BRValue of 0 provides 50/50 duty cycle *only* when
+                         * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
+                         * 50/50 duty cycle.
+                         */
+                        BRValue = 1;
+                        TMCValue >>= 1;
+                }
+
+                /* while TMCValue is too big for TMC register, divide
+                 * by 2 and increment BR exponent.
+                 */
+                for(; TMCValue > 256 && BRValue < 10; BRValue++)
+                        TMCValue >>= 1;
+
+                write_reg(info, TXS,
+                        (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
+                write_reg(info, RXS,
+                        (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
+                write_reg(info, TMC, (unsigned char)TMCValue);
+        }
+        else {
+                write_reg(info, TXS,0);
+                write_reg(info, RXS,0);
+                write_reg(info, TMC, 0);
+        }
+}
+
+/* Disable receiver
+ */
+static void rx_stop(SLMP_INFO *info)
+{
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):%s rx_stop()\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        write_reg(info, CMD, RXRESET);
+
+        info->ie0_value &= ~RXRDYE;
+        write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
+
+        write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
+        write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
+        write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
+
+        info->rx_enabled = false;
+        info->rx_overflow = false;
+}
+
+/* enable the receiver
+ */
+static void rx_start(SLMP_INFO *info)
+{
+        int i;
+
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):%s rx_start()\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        write_reg(info, CMD, RXRESET);
+
+        if ( info->params.mode == MGSL_MODE_HDLC ) {
+                /* HDLC, disabe IRQ on rxdata */
+                info->ie0_value &= ~RXRDYE;
+                write_reg(info, IE0, info->ie0_value);
+
+                /* Reset all Rx DMA buffers and program rx dma */
+                write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
+                write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
+
+                for (i = 0; i < info->rx_buf_count; i++) {
+                        info->rx_buf_list[i].status = 0xff;
+
+                        // throttle to 4 shared memory writes at a time to prevent
+                        // hogging local bus (keep latency time for DMA requests low).
+                        if (!(i % 4))
+                                read_status_reg(info);
+                }
+                info->current_rx_buf = 0;
+
+                /* set current/1st descriptor address */
+                write_reg16(info, RXDMA + CDA,
+                        info->rx_buf_list_ex[0].phys_entry);
+
+                /* set new last rx descriptor address */
+                write_reg16(info, RXDMA + EDA,
+                        info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
+
+                /* set buffer length (shared by all rx dma data buffers) */
+                write_reg16(info, RXDMA + BFL, SCABUFSIZE);
+
+                write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
+                write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
+        } else {
+                /* async, enable IRQ on rxdata */
+                info->ie0_value |= RXRDYE;
+                write_reg(info, IE0, info->ie0_value);
+        }
+
+        write_reg(info, CMD, RXENABLE);
+
+        info->rx_overflow = false;
+        info->rx_enabled = true;
+}
+
+/* Enable the transmitter and send a transmit frame if
+ * one is loaded in the DMA buffers.
+ */
+static void tx_start(SLMP_INFO *info)
+{
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):%s tx_start() tx_count=%d\n",
+                         __FILE__,__LINE__, info->device_name,info->tx_count );
+
+        if (!info->tx_enabled ) {
+                write_reg(info, CMD, TXRESET);
+                write_reg(info, CMD, TXENABLE);
+                info->tx_enabled = true;
+        }
+
+        if ( info->tx_count ) {
+
+                /* If auto RTS enabled and RTS is inactive, then assert */
+                /* RTS and set a flag indicating that the driver should */
+                /* negate RTS when the transmission completes. */
+
+                info->drop_rts_on_tx_done = false;
+
+                if (info->params.mode != MGSL_MODE_ASYNC) {
+
+                        if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
+                                get_signals( info );
+                                if ( !(info->serial_signals & SerialSignal_RTS) ) {
+                                        info->serial_signals |= SerialSignal_RTS;
+                                        set_signals( info );
+                                        info->drop_rts_on_tx_done = true;
+                                }
+                        }
+
+                        write_reg16(info, TRC0,
+                                (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
+
+                        write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
+                        write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
+        
+                        /* set TX CDA (current descriptor address) */
+                        write_reg16(info, TXDMA + CDA,
+                                info->tx_buf_list_ex[0].phys_entry);
+        
+                        /* set TX EDA (last descriptor address) */
+                        write_reg16(info, TXDMA + EDA,
+                                info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
+        
+                        /* enable underrun IRQ */
+                        info->ie1_value &= ~IDLE;
+                        info->ie1_value |= UDRN;
+                        write_reg(info, IE1, info->ie1_value);
+                        write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
+        
+                        write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
+                        write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
+        
+                        mod_timer(&info->tx_timer, jiffies +
+                                        msecs_to_jiffies(5000));
+                }
+                else {
+                        tx_load_fifo(info);
+                        /* async, enable IRQ on txdata */
+                        info->ie0_value |= TXRDYE;
+                        write_reg(info, IE0, info->ie0_value);
+                }
+
+                info->tx_active = true;
+        }
+}
+
+/* stop the transmitter and DMA
+ */
+static void tx_stop( SLMP_INFO *info )
+{
+        if (debug_level >= DEBUG_LEVEL_ISR)
+                printk("%s(%d):%s tx_stop()\n",
+                         __FILE__,__LINE__, info->device_name );
+
+        del_timer(&info->tx_timer);
+
+        write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
+        write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
+
+        write_reg(info, CMD, TXRESET);
+
+        info->ie1_value &= ~(UDRN + IDLE);
+        write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
+        write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
+
+        info->ie0_value &= ~TXRDYE;
+        write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
+
+        info->tx_enabled = false;
+        info->tx_active = false;
+}
+
+/* Fill the transmit FIFO until the FIFO is full or
+ * there is no more data to load.
+ */
+static void tx_load_fifo(SLMP_INFO *info)
+{
+        u8 TwoBytes[2];
+
+        /* do nothing is now tx data available and no XON/XOFF pending */
+
+        if ( !info->tx_count && !info->x_char )
+                return;
+
+        /* load the Transmit FIFO until FIFOs full or all data sent */
+
+        while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
+
+                /* there is more space in the transmit FIFO and */
+                /* there is more data in transmit buffer */
+
+                if ( (info->tx_count > 1) && !info->x_char ) {
+                        /* write 16-bits */
+                        TwoBytes[0] = info->tx_buf[info->tx_get++];
+                        if (info->tx_get >= info->max_frame_size)
+                                info->tx_get -= info->max_frame_size;
+                        TwoBytes[1] = info->tx_buf[info->tx_get++];
+                        if (info->tx_get >= info->max_frame_size)
+                                info->tx_get -= info->max_frame_size;
+
+                        write_reg16(info, TRB, *((u16 *)TwoBytes));
+
+                        info->tx_count -= 2;
+                        info->icount.tx += 2;
+                } else {
+                        /* only 1 byte left to transmit or 1 FIFO slot left */
+
+                        if (info->x_char) {
+                                /* transmit pending high priority char */
+                                write_reg(info, TRB, info->x_char);
+                                info->x_char = 0;
+                        } else {
+                                write_reg(info, TRB, info->tx_buf[info->tx_get++]);
+                                if (info->tx_get >= info->max_frame_size)
+                                        info->tx_get -= info->max_frame_size;
+                                info->tx_count--;
+                        }
+                        info->icount.tx++;
+                }
+        }
+}
+
+/* Reset a port to a known state
+ */
+static void reset_port(SLMP_INFO *info)
+{
+        if (info->sca_base) {
+
+                tx_stop(info);
+                rx_stop(info);
+
+                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
+                set_signals(info);
+
+                /* disable all port interrupts */
+                info->ie0_value = 0;
+                info->ie1_value = 0;
+                info->ie2_value = 0;
+                write_reg(info, IE0, info->ie0_value);
+                write_reg(info, IE1, info->ie1_value);
+                write_reg(info, IE2, info->ie2_value);
+
+                write_reg(info, CMD, CHRESET);
+        }
+}
+
+/* Reset all the ports to a known state.
+ */
+static void reset_adapter(SLMP_INFO *info)
+{
+        int i;
+
+        for ( i=0; i < SCA_MAX_PORTS; ++i) {
+                if (info->port_array[i])
+                        reset_port(info->port_array[i]);
+        }
+}
+
+/* Program port for asynchronous communications.
+ */
+static void async_mode(SLMP_INFO *info)
+{
+
+        unsigned char RegValue;
+
+        tx_stop(info);
+        rx_stop(info);
+
+        /* MD0, Mode Register 0
+         *
+         * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
+         * 04      AUTO, Auto-enable (RTS/CTS/DCD)
+         * 03      Reserved, must be 0
+         * 02      CRCCC, CRC Calculation, 0=disabled
+         * 01..00  STOP<1..0> Stop bits (00=1,10=2)
+         *
+         * 0000 0000
+         */
+        RegValue = 0x00;
+        if (info->params.stop_bits != 1)
+                RegValue |= BIT1;
+        write_reg(info, MD0, RegValue);
+
+        /* MD1, Mode Register 1
+         *
+         * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
+         * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
+         * 03..02  RXCHR<1..0>, rx char size
+         * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
+         *
+         * 0100 0000
+         */
+        RegValue = 0x40;
+        switch (info->params.data_bits) {
+        case 7: RegValue |= BIT4 + BIT2; break;
+        case 6: RegValue |= BIT5 + BIT3; break;
+        case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
+        }
+        if (info->params.parity != ASYNC_PARITY_NONE) {
+                RegValue |= BIT1;
+                if (info->params.parity == ASYNC_PARITY_ODD)
+                        RegValue |= BIT0;
+        }
+        write_reg(info, MD1, RegValue);
+
+        /* MD2, Mode Register 2
+         *
+         * 07..02  Reserved, must be 0
+         * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
+         *
+         * 0000 0000
+         */
+        RegValue = 0x00;
+        if (info->params.loopback)
+                RegValue |= (BIT1 + BIT0);
+        write_reg(info, MD2, RegValue);
+
+        /* RXS, Receive clock source
+         *
+         * 07      Reserved, must be 0
+         * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
+         * 03..00  RXBR<3..0>, rate divisor, 0000=1
+         */
+        RegValue=BIT6;
+        write_reg(info, RXS, RegValue);
+
+        /* TXS, Transmit clock source
+         *
+         * 07      Reserved, must be 0
+         * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
+         * 03..00  RXBR<3..0>, rate divisor, 0000=1
+         */
+        RegValue=BIT6;
+        write_reg(info, TXS, RegValue);
+
+        /* Control Register
+         *
+         * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
+         */
+        info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
+        write_control_reg(info);
+
+        tx_set_idle(info);
+
+        /* RRC Receive Ready Control 0
+         *
+         * 07..05  Reserved, must be 0
+         * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
+         */
+        write_reg(info, RRC, 0x00);
+
+        /* TRC0 Transmit Ready Control 0
+         *
+         * 07..05  Reserved, must be 0
+         * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
+         */
+        write_reg(info, TRC0, 0x10);
+
+        /* TRC1 Transmit Ready Control 1
+         *
+         * 07..05  Reserved, must be 0
+         * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
+         */
+        write_reg(info, TRC1, 0x1e);
+
+        /* CTL, MSCI control register
+         *
+         * 07..06  Reserved, set to 0
+         * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
+         * 04      IDLC, idle control, 0=mark 1=idle register
+         * 03      BRK, break, 0=off 1 =on (async)
+         * 02      SYNCLD, sync char load enable (BSC) 1=enabled
+         * 01      GOP, go active on poll (LOOP mode) 1=enabled
+         * 00      RTS, RTS output control, 0=active 1=inactive
+         *
+         * 0001 0001
+         */
+        RegValue = 0x10;
+        if (!(info->serial_signals & SerialSignal_RTS))
+                RegValue |= 0x01;
+        write_reg(info, CTL, RegValue);
+
+        /* enable status interrupts */
+        info->ie0_value |= TXINTE + RXINTE;
+        write_reg(info, IE0, info->ie0_value);
+
+        /* enable break detect interrupt */
+        info->ie1_value = BRKD;
+        write_reg(info, IE1, info->ie1_value);
+
+        /* enable rx overrun interrupt */
+        info->ie2_value = OVRN;
+        write_reg(info, IE2, info->ie2_value);
+
+        set_rate( info, info->params.data_rate * 16 );
+}
+
+/* Program the SCA for HDLC communications.
+ */
+static void hdlc_mode(SLMP_INFO *info)
+{
+        unsigned char RegValue;
+        u32 DpllDivisor;
+
+        // Can't use DPLL because SCA outputs recovered clock on RxC when
+        // DPLL mode selected. This causes output contention with RxC receiver.
+        // Use of DPLL would require external hardware to disable RxC receiver
+        // when DPLL mode selected.
+        info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
+
+        /* disable DMA interrupts */
+        write_reg(info, TXDMA + DIR, 0);
+        write_reg(info, RXDMA + DIR, 0);
+
+        /* MD0, Mode Register 0
+         *
+         * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
+         * 04      AUTO, Auto-enable (RTS/CTS/DCD)
+         * 03      Reserved, must be 0
+         * 02      CRCCC, CRC Calculation, 1=enabled
+         * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
+         * 00      CRC0, CRC initial value, 1 = all 1s
+         *
+         * 1000 0001
+         */
+        RegValue = 0x81;
+        if (info->params.flags & HDLC_FLAG_AUTO_CTS)
+                RegValue |= BIT4;
+        if (info->params.flags & HDLC_FLAG_AUTO_DCD)
+                RegValue |= BIT4;
+        if (info->params.crc_type == HDLC_CRC_16_CCITT)
+                RegValue |= BIT2 + BIT1;
+        write_reg(info, MD0, RegValue);
+
+        /* MD1, Mode Register 1
+         *
+         * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
+         * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
+         * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
+         * 01..00  PMPM<1..0>, Parity mode, 00=no parity
+         *
+         * 0000 0000
+         */
+        RegValue = 0x00;
+        write_reg(info, MD1, RegValue);
+
+        /* MD2, Mode Register 2
+         *
+         * 07      NRZFM, 0=NRZ, 1=FM
+         * 06..05  CODE<1..0> Encoding, 00=NRZ
+         * 04..03  DRATE<1..0> DPLL Divisor, 00=8
+         * 02      Reserved, must be 0
+         * 01..00  CNCT<1..0> Channel connection, 0=normal
+         *
+         * 0000 0000
+         */
+        RegValue = 0x00;
+        switch(info->params.encoding) {
+        case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
+        case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
+        case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
+        case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
+#if 0
+        case HDLC_ENCODING_NRZB:                                        /* not supported */
+        case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
+        case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
+#endif
+        }
+        if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
+                DpllDivisor = 16;
+                RegValue |= BIT3;
+        } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
+                DpllDivisor = 8;
+        } else {
+                DpllDivisor = 32;
+                RegValue |= BIT4;
+        }
+        write_reg(info, MD2, RegValue);
+
+
+        /* RXS, Receive clock source
+         *
+         * 07      Reserved, must be 0
+         * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
+         * 03..00  RXBR<3..0>, rate divisor, 0000=1
+         */
+        RegValue=0;
+        if (info->params.flags & HDLC_FLAG_RXC_BRG)
+                RegValue |= BIT6;
+        if (info->params.flags & HDLC_FLAG_RXC_DPLL)
+                RegValue |= BIT6 + BIT5;
+        write_reg(info, RXS, RegValue);
+
+        /* TXS, Transmit clock source
+         *
+         * 07      Reserved, must be 0
+         * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
+         * 03..00  RXBR<3..0>, rate divisor, 0000=1
+         */
+        RegValue=0;
+        if (info->params.flags & HDLC_FLAG_TXC_BRG)
+                RegValue |= BIT6;
+        if (info->params.flags & HDLC_FLAG_TXC_DPLL)
+                RegValue |= BIT6 + BIT5;
+        write_reg(info, TXS, RegValue);
+
+        if (info->params.flags & HDLC_FLAG_RXC_DPLL)
+                set_rate(info, info->params.clock_speed * DpllDivisor);
+        else
+                set_rate(info, info->params.clock_speed);
+
+        /* GPDATA (General Purpose I/O Data Register)
+         *
+         * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
+         */
+        if (info->params.flags & HDLC_FLAG_TXC_BRG)
+                info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
+        else
+                info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
+        write_control_reg(info);
+
+        /* RRC Receive Ready Control 0
+         *
+         * 07..05  Reserved, must be 0
+         * 04..00  RRC<4..0> Rx FIFO trigger active
+         */
+        write_reg(info, RRC, rx_active_fifo_level);
+
+        /* TRC0 Transmit Ready Control 0
+         *
+         * 07..05  Reserved, must be 0
+         * 04..00  TRC<4..0> Tx FIFO trigger active
+         */
+        write_reg(info, TRC0, tx_active_fifo_level);
+
+        /* TRC1 Transmit Ready Control 1
+         *
+         * 07..05  Reserved, must be 0
+         * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
+         */
+        write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
+
+        /* DMR, DMA Mode Register
+         *
+         * 07..05  Reserved, must be 0
+         * 04      TMOD, Transfer Mode: 1=chained-block
+         * 03      Reserved, must be 0
+         * 02      NF, Number of Frames: 1=multi-frame
+         * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
+         * 00      Reserved, must be 0
+         *
+         * 0001 0100
+         */
+        write_reg(info, TXDMA + DMR, 0x14);
+        write_reg(info, RXDMA + DMR, 0x14);
+
+        /* Set chain pointer base (upper 8 bits of 24 bit addr) */
+        write_reg(info, RXDMA + CPB,
+                (unsigned char)(info->buffer_list_phys >> 16));
+
+        /* Set chain pointer base (upper 8 bits of 24 bit addr) */
+        write_reg(info, TXDMA + CPB,
+                (unsigned char)(info->buffer_list_phys >> 16));
+
+        /* enable status interrupts. other code enables/disables
+         * the individual sources for these two interrupt classes.
+         */
+        info->ie0_value |= TXINTE + RXINTE;
+        write_reg(info, IE0, info->ie0_value);
+
+        /* CTL, MSCI control register
+         *
+         * 07..06  Reserved, set to 0
+         * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
+         * 04      IDLC, idle control, 0=mark 1=idle register
+         * 03      BRK, break, 0=off 1 =on (async)
+         * 02      SYNCLD, sync char load enable (BSC) 1=enabled
+         * 01      GOP, go active on poll (LOOP mode) 1=enabled
+         * 00      RTS, RTS output control, 0=active 1=inactive
+         *
+         * 0001 0001
+         */
+        RegValue = 0x10;
+        if (!(info->serial_signals & SerialSignal_RTS))
+                RegValue |= 0x01;
+        write_reg(info, CTL, RegValue);
+
+        /* preamble not supported ! */
+
+        tx_set_idle(info);
+        tx_stop(info);
+        rx_stop(info);
+
+        set_rate(info, info->params.clock_speed);
+
+        if (info->params.loopback)
+                enable_loopback(info,1);
+}
+
+/* Set the transmit HDLC idle mode
+ */
+static void tx_set_idle(SLMP_INFO *info)
+{
+        unsigned char RegValue = 0xff;
+
+        /* Map API idle mode to SCA register bits */
+        switch(info->idle_mode) {
+        case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
+        case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
+        case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
+        case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
+        case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
+        case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
+        case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
+        }
+
+        write_reg(info, IDL, RegValue);
+}
+
+/* Query the adapter for the state of the V24 status (input) signals.
+ */
+static void get_signals(SLMP_INFO *info)
+{
+        u16 status = read_reg(info, SR3);
+        u16 gpstatus = read_status_reg(info);
+        u16 testbit;
+
+        /* clear all serial signals except DTR and RTS */
+        info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
+
+        /* set serial signal bits to reflect MISR */
+
+        if (!(status & BIT3))
+                info->serial_signals |= SerialSignal_CTS;
+
+        if ( !(status & BIT2))
+                info->serial_signals |= SerialSignal_DCD;
+
+        testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
+        if (!(gpstatus & testbit))
+                info->serial_signals |= SerialSignal_RI;
+
+        testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
+        if (!(gpstatus & testbit))
+                info->serial_signals |= SerialSignal_DSR;
+}
+
+/* Set the state of DTR and RTS based on contents of
+ * serial_signals member of device context.
+ */
+static void set_signals(SLMP_INFO *info)
+{
+        unsigned char RegValue;
+        u16 EnableBit;
+
+        RegValue = read_reg(info, CTL);
+        if (info->serial_signals & SerialSignal_RTS)
+                RegValue &= ~BIT0;
+        else
+                RegValue |= BIT0;
+        write_reg(info, CTL, RegValue);
+
+        // Port 0..3 DTR is ctrl reg <1,3,5,7>
+        EnableBit = BIT1 << (info->port_num*2);
+        if (info->serial_signals & SerialSignal_DTR)
+                info->port_array[0]->ctrlreg_value &= ~EnableBit;
+        else
+                info->port_array[0]->ctrlreg_value |= EnableBit;
+        write_control_reg(info);
+}
+
+/*******************/
+/* DMA Buffer Code */
+/*******************/
+
+/* Set the count for all receive buffers to SCABUFSIZE
+ * and set the current buffer to the first buffer. This effectively
+ * makes all buffers free and discards any data in buffers.
+ */
+static void rx_reset_buffers(SLMP_INFO *info)
+{
+        rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
+}
+
+/* Free the buffers used by a received frame
+ *
+ * info   pointer to device instance data
+ * first  index of 1st receive buffer of frame
+ * last   index of last receive buffer of frame
+ */
+static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
+{
+        bool done = false;
+
+        while(!done) {
+                /* reset current buffer for reuse */
+                info->rx_buf_list[first].status = 0xff;
+
+                if (first == last) {
+                        done = true;
+                        /* set new last rx descriptor address */
+                        write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
+                }
+
+                first++;
+                if (first == info->rx_buf_count)
+                        first = 0;
+        }
+
+        /* set current buffer to next buffer after last buffer of frame */
+        info->current_rx_buf = first;
+}
+
+/* Return a received frame from the receive DMA buffers.
+ * Only frames received without errors are returned.
+ *
+ * Return Value:        true if frame returned, otherwise false
+ */
+static bool rx_get_frame(SLMP_INFO *info)
+{
+        unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
+        unsigned short status;
+        unsigned int framesize = 0;
+        bool ReturnCode = false;
+        unsigned long flags;
+        struct tty_struct *tty = info->port.tty;
+        unsigned char addr_field = 0xff;
+        SCADESC *desc;
+        SCADESC_EX *desc_ex;
+
+CheckAgain:
+        /* assume no frame returned, set zero length */
+        framesize = 0;
+        addr_field = 0xff;
+
+        /*
+         * current_rx_buf points to the 1st buffer of the next available
+         * receive frame. To find the last buffer of the frame look for
+         * a non-zero status field in the buffer entries. (The status
+         * field is set by the 16C32 after completing a receive frame.
+         */
+        StartIndex = EndIndex = info->current_rx_buf;
+
+        for ( ;; ) {
+                desc = &info->rx_buf_list[EndIndex];
+                desc_ex = &info->rx_buf_list_ex[EndIndex];
+
+                if (desc->status == 0xff)
+                        goto Cleanup;   /* current desc still in use, no frames available */
+
+                if (framesize == 0 && info->params.addr_filter != 0xff)
+                        addr_field = desc_ex->virt_addr[0];
+
+                framesize += desc->length;
+
+                /* Status != 0 means last buffer of frame */
+                if (desc->status)
+                        break;
+
+                EndIndex++;
+                if (EndIndex == info->rx_buf_count)
+                        EndIndex = 0;
+
+                if (EndIndex == info->current_rx_buf) {
+                        /* all buffers have been 'used' but none mark      */
+                        /* the end of a frame. Reset buffers and receiver. */
+                        if ( info->rx_enabled ){
+                                spin_lock_irqsave(&info->lock,flags);
+                                rx_start(info);
+                                spin_unlock_irqrestore(&info->lock,flags);
+                        }
+                        goto Cleanup;
+                }
+
+        }
+
+        /* check status of receive frame */
+
+        /* frame status is byte stored after frame data
+         *
+         * 7 EOM (end of msg), 1 = last buffer of frame
+         * 6 Short Frame, 1 = short frame
+         * 5 Abort, 1 = frame aborted
+         * 4 Residue, 1 = last byte is partial
+         * 3 Overrun, 1 = overrun occurred during frame reception
+         * 2 CRC,     1 = CRC error detected
+         *
+         */
+        status = desc->status;
+
+        /* ignore CRC bit if not using CRC (bit is undefined) */
+        /* Note:CRC is not save to data buffer */
+        if (info->params.crc_type == HDLC_CRC_NONE)
+                status &= ~BIT2;
+
+        if (framesize == 0 ||
+                 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
+                /* discard 0 byte frames, this seems to occur sometime
+                 * when remote is idling flags.
+                 */
+                rx_free_frame_buffers(info, StartIndex, EndIndex);
+                goto CheckAgain;
+        }
+
+        if (framesize < 2)
+                status |= BIT6;
+
+        if (status & (BIT6+BIT5+BIT3+BIT2)) {
+                /* received frame has errors,
+                 * update counts and mark frame size as 0
+                 */
+                if (status & BIT6)
+                        info->icount.rxshort++;
+                else if (status & BIT5)
+                        info->icount.rxabort++;
+                else if (status & BIT3)
+                        info->icount.rxover++;
+                else
+                        info->icount.rxcrc++;
+
+                framesize = 0;
+#if SYNCLINK_GENERIC_HDLC
+                {
+                        info->netdev->stats.rx_errors++;
+                        info->netdev->stats.rx_frame_errors++;
+                }
+#endif
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_BH )
+                printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
+                        __FILE__,__LINE__,info->device_name,status,framesize);
+
+        if ( debug_level >= DEBUG_LEVEL_DATA )
+                trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
+                        min_t(int, framesize,SCABUFSIZE),0);
+
+        if (framesize) {
+                if (framesize > info->max_frame_size)
+                        info->icount.rxlong++;
+                else {
+                        /* copy dma buffer(s) to contiguous intermediate buffer */
+                        int copy_count = framesize;
+                        int index = StartIndex;
+                        unsigned char *ptmp = info->tmp_rx_buf;
+                        info->tmp_rx_buf_count = framesize;
+
+                        info->icount.rxok++;
+
+                        while(copy_count) {
+                                int partial_count = min(copy_count,SCABUFSIZE);
+                                memcpy( ptmp,
+                                        info->rx_buf_list_ex[index].virt_addr,
+                                        partial_count );
+                                ptmp += partial_count;
+                                copy_count -= partial_count;
+
+                                if ( ++index == info->rx_buf_count )
+                                        index = 0;
+                        }
+
+#if SYNCLINK_GENERIC_HDLC
+                        if (info->netcount)
+                                hdlcdev_rx(info,info->tmp_rx_buf,framesize);
+                        else
+#endif
+                                ldisc_receive_buf(tty,info->tmp_rx_buf,
+                                                  info->flag_buf, framesize);
+                }
+        }
+        /* Free the buffers used by this frame. */
+        rx_free_frame_buffers( info, StartIndex, EndIndex );
+
+        ReturnCode = true;
+
+Cleanup:
+        if ( info->rx_enabled && info->rx_overflow ) {
+                /* Receiver is enabled, but needs to restarted due to
+                 * rx buffer overflow. If buffers are empty, restart receiver.
+                 */
+                if (info->rx_buf_list[EndIndex].status == 0xff) {
+                        spin_lock_irqsave(&info->lock,flags);
+                        rx_start(info);
+                        spin_unlock_irqrestore(&info->lock,flags);
+                }
+        }
+
+        return ReturnCode;
+}
+
+/* load the transmit DMA buffer with data
+ */
+static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
+{
+        unsigned short copy_count;
+        unsigned int i = 0;
+        SCADESC *desc;
+        SCADESC_EX *desc_ex;
+
+        if ( debug_level >= DEBUG_LEVEL_DATA )
+                trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
+
+        /* Copy source buffer to one or more DMA buffers, starting with
+         * the first transmit dma buffer.
+         */
+        for(i=0;;)
+        {
+                copy_count = min_t(unsigned short,count,SCABUFSIZE);
+
+                desc = &info->tx_buf_list[i];
+                desc_ex = &info->tx_buf_list_ex[i];
+
+                load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
+
+                desc->length = copy_count;
+                desc->status = 0;
+
+                buf += copy_count;
+                count -= copy_count;
+
+                if (!count)
+                        break;
+
+                i++;
+                if (i >= info->tx_buf_count)
+                        i = 0;
+        }
+
+        info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
+        info->last_tx_buf = ++i;
+}
+
+static bool register_test(SLMP_INFO *info)
+{
+        static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
+        static unsigned int count = ARRAY_SIZE(testval);
+        unsigned int i;
+        bool rc = true;
+        unsigned long flags;
+
+        spin_lock_irqsave(&info->lock,flags);
+        reset_port(info);
+
+        /* assume failure */
+        info->init_error = DiagStatus_AddressFailure;
+
+        /* Write bit patterns to various registers but do it out of */
+        /* sync, then read back and verify values. */
+
+        for (i = 0 ; i < count ; i++) {
+                write_reg(info, TMC, testval[i]);
+                write_reg(info, IDL, testval[(i+1)%count]);
+                write_reg(info, SA0, testval[(i+2)%count]);
+                write_reg(info, SA1, testval[(i+3)%count]);
+
+                if ( (read_reg(info, TMC) != testval[i]) ||
+                          (read_reg(info, IDL) != testval[(i+1)%count]) ||
+                          (read_reg(info, SA0) != testval[(i+2)%count]) ||
+                          (read_reg(info, SA1) != testval[(i+3)%count]) )
+                {
+                        rc = false;
+                        break;
+                }
+        }
+
+        reset_port(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        return rc;
+}
+
+static bool irq_test(SLMP_INFO *info)
+{
+        unsigned long timeout;
+        unsigned long flags;
+
+        unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
+
+        spin_lock_irqsave(&info->lock,flags);
+        reset_port(info);
+
+        /* assume failure */
+        info->init_error = DiagStatus_IrqFailure;
+        info->irq_occurred = false;
+
+        /* setup timer0 on SCA0 to interrupt */
+
+        /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
+        write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
+
+        write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
+        write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
+
+
+        /* TMCS, Timer Control/Status Register
+         *
+         * 07      CMF, Compare match flag (read only) 1=match
+         * 06      ECMI, CMF Interrupt Enable: 1=enabled
+         * 05      Reserved, must be 0
+         * 04      TME, Timer Enable
+         * 03..00  Reserved, must be 0
+         *
+         * 0101 0000
+         */
+        write_reg(info, (unsigned char)(timer + TMCS), 0x50);
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        timeout=100;
+        while( timeout-- && !info->irq_occurred ) {
+                msleep_interruptible(10);
+        }
+
+        spin_lock_irqsave(&info->lock,flags);
+        reset_port(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        return info->irq_occurred;
+}
+
+/* initialize individual SCA device (2 ports)
+ */
+static bool sca_init(SLMP_INFO *info)
+{
+        /* set wait controller to single mem partition (low), no wait states */
+        write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
+        write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
+        write_reg(info, WCRL, 0);       /* wait controller low range */
+        write_reg(info, WCRM, 0);       /* wait controller mid range */
+        write_reg(info, WCRH, 0);       /* wait controller high range */
+
+        /* DPCR, DMA Priority Control
+         *
+         * 07..05  Not used, must be 0
+         * 04      BRC, bus release condition: 0=all transfers complete
+         * 03      CCC, channel change condition: 0=every cycle
+         * 02..00  PR<2..0>, priority 100=round robin
+         *
+         * 00000100 = 0x04
+         */
+        write_reg(info, DPCR, dma_priority);
+
+        /* DMA Master Enable, BIT7: 1=enable all channels */
+        write_reg(info, DMER, 0x80);
+
+        /* enable all interrupt classes */
+        write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
+        write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
+        write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
+
+        /* ITCR, interrupt control register
+         * 07      IPC, interrupt priority, 0=MSCI->DMA
+         * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
+         * 04      VOS, Vector Output, 0=unmodified vector
+         * 03..00  Reserved, must be 0
+         */
+        write_reg(info, ITCR, 0);
+
+        return true;
+}
+
+/* initialize adapter hardware
+ */
+static bool init_adapter(SLMP_INFO *info)
+{
+        int i;
+
+        /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
+        volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
+        u32 readval;
+
+        info->misc_ctrl_value |= BIT30;
+        *MiscCtrl = info->misc_ctrl_value;
+
+        /*
+         * Force at least 170ns delay before clearing
+         * reset bit. Each read from LCR takes at least
+         * 30ns so 10 times for 300ns to be safe.
+         */
+        for(i=0;i<10;i++)
+                readval = *MiscCtrl;
+
+        info->misc_ctrl_value &= ~BIT30;
+        *MiscCtrl = info->misc_ctrl_value;
+
+        /* init control reg (all DTRs off, all clksel=input) */
+        info->ctrlreg_value = 0xaa;
+        write_control_reg(info);
+
+        {
+                volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
+                lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
+
+                switch(read_ahead_count)
+                {
+                case 16:
+                        lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
+                        break;
+                case 8:
+                        lcr1_brdr_value |= BIT5 + BIT4;
+                        break;
+                case 4:
+                        lcr1_brdr_value |= BIT5 + BIT3;
+                        break;
+                case 0:
+                        lcr1_brdr_value |= BIT5;
+                        break;
+                }
+
+                *LCR1BRDR = lcr1_brdr_value;
+                *MiscCtrl = misc_ctrl_value;
+        }
+
+        sca_init(info->port_array[0]);
+        sca_init(info->port_array[2]);
+
+        return true;
+}
+
+/* Loopback an HDLC frame to test the hardware
+ * interrupt and DMA functions.
+ */
+static bool loopback_test(SLMP_INFO *info)
+{
+#define TESTFRAMESIZE 20
+
+        unsigned long timeout;
+        u16 count = TESTFRAMESIZE;
+        unsigned char buf[TESTFRAMESIZE];
+        bool rc = false;
+        unsigned long flags;
+
+        struct tty_struct *oldtty = info->port.tty;
+        u32 speed = info->params.clock_speed;
+
+        info->params.clock_speed = 3686400;
+        info->port.tty = NULL;
+
+        /* assume failure */
+        info->init_error = DiagStatus_DmaFailure;
+
+        /* build and send transmit frame */
+        for (count = 0; count < TESTFRAMESIZE;++count)
+                buf[count] = (unsigned char)count;
+
+        memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
+
+        /* program hardware for HDLC and enabled receiver */
+        spin_lock_irqsave(&info->lock,flags);
+        hdlc_mode(info);
+        enable_loopback(info,1);
+        rx_start(info);
+        info->tx_count = count;
+        tx_load_dma_buffer(info,buf,count);
+        tx_start(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        /* wait for receive complete */
+        /* Set a timeout for waiting for interrupt. */
+        for ( timeout = 100; timeout; --timeout ) {
+                msleep_interruptible(10);
+
+                if (rx_get_frame(info)) {
+                        rc = true;
+                        break;
+                }
+        }
+
+        /* verify received frame length and contents */
+        if (rc &&
+            ( info->tmp_rx_buf_count != count ||
+              memcmp(buf, info->tmp_rx_buf,count))) {
+                rc = false;
+        }
+
+        spin_lock_irqsave(&info->lock,flags);
+        reset_adapter(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        info->params.clock_speed = speed;
+        info->port.tty = oldtty;
+
+        return rc;
+}
+
+/* Perform diagnostics on hardware
+ */
+static int adapter_test( SLMP_INFO *info )
+{
+        unsigned long flags;
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):Testing device %s\n",
+                        __FILE__,__LINE__,info->device_name );
+
+        spin_lock_irqsave(&info->lock,flags);
+        init_adapter(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        info->port_array[0]->port_count = 0;
+
+        if ( register_test(info->port_array[0]) &&
+                register_test(info->port_array[1])) {
+
+                info->port_array[0]->port_count = 2;
+
+                if ( register_test(info->port_array[2]) &&
+                        register_test(info->port_array[3]) )
+                        info->port_array[0]->port_count += 2;
+        }
+        else {
+                printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
+                        __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
+                return -ENODEV;
+        }
+
+        if ( !irq_test(info->port_array[0]) ||
+                !irq_test(info->port_array[1]) ||
+                 (info->port_count == 4 && !irq_test(info->port_array[2])) ||
+                 (info->port_count == 4 && !irq_test(info->port_array[3]))) {
+                printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
+                        __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
+                return -ENODEV;
+        }
+
+        if (!loopback_test(info->port_array[0]) ||
+                !loopback_test(info->port_array[1]) ||
+                 (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
+                 (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
+                printk( "%s(%d):DMA test failure for device %s\n",
+                        __FILE__,__LINE__,info->device_name);
+                return -ENODEV;
+        }
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):device %s passed diagnostics\n",
+                        __FILE__,__LINE__,info->device_name );
+
+        info->port_array[0]->init_error = 0;
+        info->port_array[1]->init_error = 0;
+        if ( info->port_count > 2 ) {
+                info->port_array[2]->init_error = 0;
+                info->port_array[3]->init_error = 0;
+        }
+
+        return 0;
+}
+
+/* Test the shared memory on a PCI adapter.
+ */
+static bool memory_test(SLMP_INFO *info)
+{
+        static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
+                0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
+        unsigned long count = ARRAY_SIZE(testval);
+        unsigned long i;
+        unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
+        unsigned long * addr = (unsigned long *)info->memory_base;
+
+        /* Test data lines with test pattern at one location. */
+
+        for ( i = 0 ; i < count ; i++ ) {
+                *addr = testval[i];
+                if ( *addr != testval[i] )
+                        return false;
+        }
+
+        /* Test address lines with incrementing pattern over */
+        /* entire address range. */
+
+        for ( i = 0 ; i < limit ; i++ ) {
+                *addr = i * 4;
+                addr++;
+        }
+
+        addr = (unsigned long *)info->memory_base;
+
+        for ( i = 0 ; i < limit ; i++ ) {
+                if ( *addr != i * 4 )
+                        return false;
+                addr++;
+        }
+
+        memset( info->memory_base, 0, SCA_MEM_SIZE );
+        return true;
+}
+
+/* Load data into PCI adapter shared memory.
+ *
+ * The PCI9050 releases control of the local bus
+ * after completing the current read or write operation.
+ *
+ * While the PCI9050 write FIFO not empty, the
+ * PCI9050 treats all of the writes as a single transaction
+ * and does not release the bus. This causes DMA latency problems
+ * at high speeds when copying large data blocks to the shared memory.
+ *
+ * This function breaks a write into multiple transations by
+ * interleaving a read which flushes the write FIFO and 'completes'
+ * the write transation. This allows any pending DMA request to gain control
+ * of the local bus in a timely fasion.
+ */
+static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
+{
+        /* A load interval of 16 allows for 4 32-bit writes at */
+        /* 136ns each for a maximum latency of 542ns on the local bus.*/
+
+        unsigned short interval = count / sca_pci_load_interval;
+        unsigned short i;
+
+        for ( i = 0 ; i < interval ; i++ )
+        {
+                memcpy(dest, src, sca_pci_load_interval);
+                read_status_reg(info);
+                dest += sca_pci_load_interval;
+                src += sca_pci_load_interval;
+        }
+
+        memcpy(dest, src, count % sca_pci_load_interval);
+}
+
+static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
+{
+        int i;
+        int linecount;
+        if (xmit)
+                printk("%s tx data:\n",info->device_name);
+        else
+                printk("%s rx data:\n",info->device_name);
+
+        while(count) {
+                if (count > 16)
+                        linecount = 16;
+                else
+                        linecount = count;
+
+                for(i=0;i<linecount;i++)
+                        printk("%02X ",(unsigned char)data[i]);
+                for(;i<17;i++)
+                        printk("   ");
+                for(i=0;i<linecount;i++) {
+                        if (data[i]>=040 && data[i]<=0176)
+                                printk("%c",data[i]);
+                        else
+                                printk(".");
+                }
+                printk("\n");
+
+                data  += linecount;
+                count -= linecount;
+        }
+}       /* end of trace_block() */
+
+/* called when HDLC frame times out
+ * update stats and do tx completion processing
+ */
+static void tx_timeout(unsigned long context)
+{
+        SLMP_INFO *info = (SLMP_INFO*)context;
+        unsigned long flags;
+
+        if ( debug_level >= DEBUG_LEVEL_INFO )
+                printk( "%s(%d):%s tx_timeout()\n",
+                        __FILE__,__LINE__,info->device_name);
+        if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
+                info->icount.txtimeout++;
+        }
+        spin_lock_irqsave(&info->lock,flags);
+        info->tx_active = false;
+        info->tx_count = info->tx_put = info->tx_get = 0;
+
+        spin_unlock_irqrestore(&info->lock,flags);
+
+#if SYNCLINK_GENERIC_HDLC
+        if (info->netcount)
+                hdlcdev_tx_done(info);
+        else
+#endif
+                bh_transmit(info);
+}
+
+/* called to periodically check the DSR/RI modem signal input status
+ */
+static void status_timeout(unsigned long context)
+{
+        u16 status = 0;
+        SLMP_INFO *info = (SLMP_INFO*)context;
+        unsigned long flags;
+        unsigned char delta;
+
+
+        spin_lock_irqsave(&info->lock,flags);
+        get_signals(info);
+        spin_unlock_irqrestore(&info->lock,flags);
+
+        /* check for DSR/RI state change */
+
+        delta = info->old_signals ^ info->serial_signals;
+        info->old_signals = info->serial_signals;
+
+        if (delta & SerialSignal_DSR)
+                status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
+
+        if (delta & SerialSignal_RI)
+                status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
+
+        if (delta & SerialSignal_DCD)
+                status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
+
+        if (delta & SerialSignal_CTS)
+                status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
+
+        if (status)
+                isr_io_pin(info,status);
+
+        mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
+}
+
+
+/* Register Access Routines -
+ * All registers are memory mapped
+ */
+#define CALC_REGADDR() \
+        unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
+        if (info->port_num > 1) \
+                RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
+        if ( info->port_num & 1) { \
+                if (Addr > 0x7f) \
+                        RegAddr += 0x40;        /* DMA access */ \
+                else if (Addr > 0x1f && Addr < 0x60) \
+                        RegAddr += 0x20;        /* MSCI access */ \
+        }
+
+
+static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
+{
+        CALC_REGADDR();
+        return *RegAddr;
+}
+static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
+{
+        CALC_REGADDR();
+        *RegAddr = Value;
+}
+
+static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
+{
+        CALC_REGADDR();
+        return *((u16 *)RegAddr);
+}
+
+static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
+{
+        CALC_REGADDR();
+        *((u16 *)RegAddr) = Value;
+}
+
+static unsigned char read_status_reg(SLMP_INFO * info)
+{
+        unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
+        return *RegAddr;
+}
+
+static void write_control_reg(SLMP_INFO * info)
+{
+        unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
+        *RegAddr = info->port_array[0]->ctrlreg_value;
+}
+
+
+static int __devinit synclinkmp_init_one (struct pci_dev *dev,
+                                          const struct pci_device_id *ent)
+{
+        if (pci_enable_device(dev)) {
+                printk("error enabling pci device %p\n", dev);
+                return -EIO;
+        }
+        device_init( ++synclinkmp_adapter_count, dev );
+        return 0;
+}
+
+static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
+{
+}
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
new file mode 100644
index 000000000000..43db715f1502
--- /dev/null
+++ b/drivers/tty/sysrq.c
@@ -0,0 +1,905 @@
+/*
+ *      Linux Magic System Request Key Hacks
+ *
+ *      (c) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ *      based on ideas by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>
+ *
+ *      (c) 2000 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
+ *      overhauled to use key registration
+ *      based upon discusions in irc://irc.openprojects.net/#kernelnewbies
+ *
+ *      Copyright (c) 2010 Dmitry Torokhov
+ *      Input handler conversion
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/kdev_t.h>
+#include <linux/major.h>
+#include <linux/reboot.h>
+#include <linux/sysrq.h>
+#include <linux/kbd_kern.h>
+#include <linux/proc_fs.h>
+#include <linux/nmi.h>
+#include <linux/quotaops.h>
+#include <linux/perf_event.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/suspend.h>
+#include <linux/writeback.h>
+#include <linux/buffer_head.h>          /* for fsync_bdev() */
+#include <linux/swap.h>
+#include <linux/spinlock.h>
+#include <linux/vt_kern.h>
+#include <linux/workqueue.h>
+#include <linux/hrtimer.h>
+#include <linux/oom.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+
+#include <asm/ptrace.h>
+#include <asm/irq_regs.h>
+
+/* Whether we react on sysrq keys or just ignore them */
+static int __read_mostly sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
+static bool __read_mostly sysrq_always_enabled;
+
+static bool sysrq_on(void)
+{
+        return sysrq_enabled || sysrq_always_enabled;
+}
+
+/*
+ * A value of 1 means 'all', other nonzero values are an op mask:
+ */
+static bool sysrq_on_mask(int mask)
+{
+        return sysrq_always_enabled ||
+               sysrq_enabled == 1 ||
+               (sysrq_enabled & mask);
+}
+
+static int __init sysrq_always_enabled_setup(char *str)
+{
+        sysrq_always_enabled = true;
+        pr_info("sysrq always enabled.\n");
+
+        return 1;
+}
+
+__setup("sysrq_always_enabled", sysrq_always_enabled_setup);
+
+
+static void sysrq_handle_loglevel(int key)
+{
+        int i;
+
+        i = key - '0';
+        console_loglevel = 7;
+        printk("Loglevel set to %d\n", i);
+        console_loglevel = i;
+}
+static struct sysrq_key_op sysrq_loglevel_op = {
+        .handler        = sysrq_handle_loglevel,
+        .help_msg       = "loglevel(0-9)",
+        .action_msg     = "Changing Loglevel",
+        .enable_mask    = SYSRQ_ENABLE_LOG,
+};
+
+#ifdef CONFIG_VT
+static void sysrq_handle_SAK(int key)
+{
+        struct work_struct *SAK_work = &vc_cons[fg_console].SAK_work;
+        schedule_work(SAK_work);
+}
+static struct sysrq_key_op sysrq_SAK_op = {
+        .handler        = sysrq_handle_SAK,
+        .help_msg       = "saK",
+        .action_msg     = "SAK",
+        .enable_mask    = SYSRQ_ENABLE_KEYBOARD,
+};
+#else
+#define sysrq_SAK_op (*(struct sysrq_key_op *)NULL)
+#endif
+
+#ifdef CONFIG_VT
+static void sysrq_handle_unraw(int key)
+{
+        struct kbd_struct *kbd = &kbd_table[fg_console];
+
+        if (kbd)
+                kbd->kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
+}
+static struct sysrq_key_op sysrq_unraw_op = {
+        .handler        = sysrq_handle_unraw,
+        .help_msg       = "unRaw",
+        .action_msg     = "Keyboard mode set to system default",
+        .enable_mask    = SYSRQ_ENABLE_KEYBOARD,
+};
+#else
+#define sysrq_unraw_op (*(struct sysrq_key_op *)NULL)
+#endif /* CONFIG_VT */
+
+static void sysrq_handle_crash(int key)
+{
+        char *killer = NULL;
+
+        panic_on_oops = 1;      /* force panic */
+        wmb();
+        *killer = 1;
+}
+static struct sysrq_key_op sysrq_crash_op = {
+        .handler        = sysrq_handle_crash,
+        .help_msg       = "Crash",
+        .action_msg     = "Trigger a crash",
+        .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+
+static void sysrq_handle_reboot(int key)
+{
+        lockdep_off();
+        local_irq_enable();
+        emergency_restart();
+}
+static struct sysrq_key_op sysrq_reboot_op = {
+        .handler        = sysrq_handle_reboot,
+        .help_msg       = "reBoot",
+        .action_msg     = "Resetting",
+        .enable_mask    = SYSRQ_ENABLE_BOOT,
+};
+
+static void sysrq_handle_sync(int key)
+{
+        emergency_sync();
+}
+static struct sysrq_key_op sysrq_sync_op = {
+        .handler        = sysrq_handle_sync,
+        .help_msg       = "Sync",
+        .action_msg     = "Emergency Sync",
+        .enable_mask    = SYSRQ_ENABLE_SYNC,
+};
+
+static void sysrq_handle_show_timers(int key)
+{
+        sysrq_timer_list_show();
+}
+
+static struct sysrq_key_op sysrq_show_timers_op = {
+        .handler        = sysrq_handle_show_timers,
+        .help_msg       = "show-all-timers(Q)",
+        .action_msg     = "Show clockevent devices & pending hrtimers (no others)",
+};
+
+static void sysrq_handle_mountro(int key)
+{
+        emergency_remount();
+}
+static struct sysrq_key_op sysrq_mountro_op = {
+        .handler        = sysrq_handle_mountro,
+        .help_msg       = "Unmount",
+        .action_msg     = "Emergency Remount R/O",
+        .enable_mask    = SYSRQ_ENABLE_REMOUNT,
+};
+
+#ifdef CONFIG_LOCKDEP
+static void sysrq_handle_showlocks(int key)
+{
+        debug_show_all_locks();
+}
+
+static struct sysrq_key_op sysrq_showlocks_op = {
+        .handler        = sysrq_handle_showlocks,
+        .help_msg       = "show-all-locks(D)",
+        .action_msg     = "Show Locks Held",
+};
+#else
+#define sysrq_showlocks_op (*(struct sysrq_key_op *)NULL)
+#endif
+
+#ifdef CONFIG_SMP
+static DEFINE_SPINLOCK(show_lock);
+
+static void showacpu(void *dummy)
+{
+        unsigned long flags;
+
+        /* Idle CPUs have no interesting backtrace. */
+        if (idle_cpu(smp_processor_id()))
+                return;
+
+        spin_lock_irqsave(&show_lock, flags);
+        printk(KERN_INFO "CPU%d:\n", smp_processor_id());
+        show_stack(NULL, NULL);
+        spin_unlock_irqrestore(&show_lock, flags);
+}
+
+static void sysrq_showregs_othercpus(struct work_struct *dummy)
+{
+        smp_call_function(showacpu, NULL, 0);
+}
+
+static DECLARE_WORK(sysrq_showallcpus, sysrq_showregs_othercpus);
+
+static void sysrq_handle_showallcpus(int key)
+{
+        /*
+         * Fall back to the workqueue based printing if the
+         * backtrace printing did not succeed or the
+         * architecture has no support for it:
+         */
+        if (!trigger_all_cpu_backtrace()) {
+                struct pt_regs *regs = get_irq_regs();
+
+                if (regs) {
+                        printk(KERN_INFO "CPU%d:\n", smp_processor_id());
+                        show_regs(regs);
+                }
+                schedule_work(&sysrq_showallcpus);
+        }
+}
+
+static struct sysrq_key_op sysrq_showallcpus_op = {
+        .handler        = sysrq_handle_showallcpus,
+        .help_msg       = "show-backtrace-all-active-cpus(L)",
+        .action_msg     = "Show backtrace of all active CPUs",
+        .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+#endif
+
+static void sysrq_handle_showregs(int key)
+{
+        struct pt_regs *regs = get_irq_regs();
+        if (regs)
+                show_regs(regs);
+        perf_event_print_debug();
+}
+static struct sysrq_key_op sysrq_showregs_op = {
+        .handler        = sysrq_handle_showregs,
+        .help_msg       = "show-registers(P)",
+        .action_msg     = "Show Regs",
+        .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+
+static void sysrq_handle_showstate(int key)
+{
+        show_state();
+}
+static struct sysrq_key_op sysrq_showstate_op = {
+        .handler        = sysrq_handle_showstate,
+        .help_msg       = "show-task-states(T)",
+        .action_msg     = "Show State",
+        .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+
+static void sysrq_handle_showstate_blocked(int key)
+{
+        show_state_filter(TASK_UNINTERRUPTIBLE);
+}
+static struct sysrq_key_op sysrq_showstate_blocked_op = {
+        .handler        = sysrq_handle_showstate_blocked,
+        .help_msg       = "show-blocked-tasks(W)",
+        .action_msg     = "Show Blocked State",
+        .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+
+#ifdef CONFIG_TRACING
+#include <linux/ftrace.h>
+
+static void sysrq_ftrace_dump(int key)
+{
+        ftrace_dump(DUMP_ALL);
+}
+static struct sysrq_key_op sysrq_ftrace_dump_op = {
+        .handler        = sysrq_ftrace_dump,
+        .help_msg       = "dump-ftrace-buffer(Z)",
+        .action_msg     = "Dump ftrace buffer",
+        .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+#else
+#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)NULL)
+#endif
+
+static void sysrq_handle_showmem(int key)
+{
+        show_mem(0);
+}
+static struct sysrq_key_op sysrq_showmem_op = {
+        .handler        = sysrq_handle_showmem,
+        .help_msg       = "show-memory-usage(M)",
+        .action_msg     = "Show Memory",
+        .enable_mask    = SYSRQ_ENABLE_DUMP,
+};
+
+/*
+ * Signal sysrq helper function.  Sends a signal to all user processes.
+ */
+static void send_sig_all(int sig)
+{
+        struct task_struct *p;
+
+        for_each_process(p) {
+                if (p->mm && !is_global_init(p))
+                        /* Not swapper, init nor kernel thread */
+                        force_sig(sig, p);
+        }
+}
+
+static void sysrq_handle_term(int key)
+{
+        send_sig_all(SIGTERM);
+        console_loglevel = 8;
+}
+static struct sysrq_key_op sysrq_term_op = {
+        .handler        = sysrq_handle_term,
+        .help_msg       = "terminate-all-tasks(E)",
+        .action_msg     = "Terminate All Tasks",
+        .enable_mask    = SYSRQ_ENABLE_SIGNAL,
+};
+
+static void moom_callback(struct work_struct *ignored)
+{
+        out_of_memory(node_zonelist(0, GFP_KERNEL), GFP_KERNEL, 0, NULL);
+}
+
+static DECLARE_WORK(moom_work, moom_callback);
+
+static void sysrq_handle_moom(int key)
+{
+        schedule_work(&moom_work);
+}
+static struct sysrq_key_op sysrq_moom_op = {
+        .handler        = sysrq_handle_moom,
+        .help_msg       = "memory-full-oom-kill(F)",
+        .action_msg     = "Manual OOM execution",
+        .enable_mask    = SYSRQ_ENABLE_SIGNAL,
+};
+
+#ifdef CONFIG_BLOCK
+static void sysrq_handle_thaw(int key)
+{
+        emergency_thaw_all();
+}
+static struct sysrq_key_op sysrq_thaw_op = {
+        .handler        = sysrq_handle_thaw,
+        .help_msg       = "thaw-filesystems(J)",
+        .action_msg     = "Emergency Thaw of all frozen filesystems",
+        .enable_mask    = SYSRQ_ENABLE_SIGNAL,
+};
+#endif
+
+static void sysrq_handle_kill(int key)
+{
+        send_sig_all(SIGKILL);
+        console_loglevel = 8;
+}
+static struct sysrq_key_op sysrq_kill_op = {
+        .handler        = sysrq_handle_kill,
+        .help_msg       = "kill-all-tasks(I)",
+        .action_msg     = "Kill All Tasks",
+        .enable_mask    = SYSRQ_ENABLE_SIGNAL,
+};
+
+static void sysrq_handle_unrt(int key)
+{
+        normalize_rt_tasks();
+}
+static struct sysrq_key_op sysrq_unrt_op = {
+        .handler        = sysrq_handle_unrt,
+        .help_msg       = "nice-all-RT-tasks(N)",
+        .action_msg     = "Nice All RT Tasks",
+        .enable_mask    = SYSRQ_ENABLE_RTNICE,
+};
+
+/* Key Operations table and lock */
+static DEFINE_SPINLOCK(sysrq_key_table_lock);
+
+static struct sysrq_key_op *sysrq_key_table[36] = {
+        &sysrq_loglevel_op,             /* 0 */
+        &sysrq_loglevel_op,             /* 1 */
+        &sysrq_loglevel_op,             /* 2 */
+        &sysrq_loglevel_op,             /* 3 */
+        &sysrq_loglevel_op,             /* 4 */
+        &sysrq_loglevel_op,             /* 5 */
+        &sysrq_loglevel_op,             /* 6 */
+        &sysrq_loglevel_op,             /* 7 */
+        &sysrq_loglevel_op,             /* 8 */
+        &sysrq_loglevel_op,             /* 9 */
+
+        /*
+         * a: Don't use for system provided sysrqs, it is handled specially on
+         * sparc and will never arrive.
+         */
+        NULL,                           /* a */
+        &sysrq_reboot_op,               /* b */
+        &sysrq_crash_op,                /* c & ibm_emac driver debug */
+        &sysrq_showlocks_op,            /* d */
+        &sysrq_term_op,                 /* e */
+        &sysrq_moom_op,                 /* f */
+        /* g: May be registered for the kernel debugger */
+        NULL,                           /* g */
+        NULL,                           /* h - reserved for help */
+        &sysrq_kill_op,                 /* i */
+#ifdef CONFIG_BLOCK
+        &sysrq_thaw_op,                 /* j */
+#else
+        NULL,                           /* j */
+#endif
+        &sysrq_SAK_op,                  /* k */
+#ifdef CONFIG_SMP
+        &sysrq_showallcpus_op,          /* l */
+#else
+        NULL,                           /* l */
+#endif
+        &sysrq_showmem_op,              /* m */
+        &sysrq_unrt_op,                 /* n */
+        /* o: This will often be registered as 'Off' at init time */
+        NULL,                           /* o */
+        &sysrq_showregs_op,             /* p */
+        &sysrq_show_timers_op,          /* q */
+        &sysrq_unraw_op,                /* r */
+        &sysrq_sync_op,                 /* s */
+        &sysrq_showstate_op,            /* t */
+        &sysrq_mountro_op,              /* u */
+        /* v: May be registered for frame buffer console restore */
+        NULL,                           /* v */
+        &sysrq_showstate_blocked_op,    /* w */
+        /* x: May be registered on ppc/powerpc for xmon */
+        NULL,                           /* x */
+        /* y: May be registered on sparc64 for global register dump */
+        NULL,                           /* y */
+        &sysrq_ftrace_dump_op,          /* z */
+};
+
+/* key2index calculation, -1 on invalid index */
+static int sysrq_key_table_key2index(int key)
+{
+        int retval;
+
+        if ((key >= '0') && (key <= '9'))
+                retval = key - '0';
+        else if ((key >= 'a') && (key <= 'z'))
+                retval = key + 10 - 'a';
+        else
+                retval = -1;
+        return retval;
+}
+
+/*
+ * get and put functions for the table, exposed to modules.
+ */
+struct sysrq_key_op *__sysrq_get_key_op(int key)
+{
+        struct sysrq_key_op *op_p = NULL;
+        int i;
+
+        i = sysrq_key_table_key2index(key);
+        if (i != -1)
+                op_p = sysrq_key_table[i];
+
+        return op_p;
+}
+
+static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
+{
+        int i = sysrq_key_table_key2index(key);
+
+        if (i != -1)
+                sysrq_key_table[i] = op_p;
+}
+
+void __handle_sysrq(int key, bool check_mask)
+{
+        struct sysrq_key_op *op_p;
+        int orig_log_level;
+        int i;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sysrq_key_table_lock, flags);
+        /*
+         * Raise the apparent loglevel to maximum so that the sysrq header
+         * is shown to provide the user with positive feedback.  We do not
+         * simply emit this at KERN_EMERG as that would change message
+         * routing in the consumers of /proc/kmsg.
+         */
+        orig_log_level = console_loglevel;
+        console_loglevel = 7;
+        printk(KERN_INFO "SysRq : ");
+
+        op_p = __sysrq_get_key_op(key);
+        if (op_p) {
+                /*
+                 * Should we check for enabled operations (/proc/sysrq-trigger
+                 * should not) and is the invoked operation enabled?
+                 */
+                if (!check_mask || sysrq_on_mask(op_p->enable_mask)) {
+                        printk("%s\n", op_p->action_msg);
+                        console_loglevel = orig_log_level;
+                        op_p->handler(key);
+                } else {
+                        printk("This sysrq operation is disabled.\n");
+                }
+        } else {
+                printk("HELP : ");
+                /* Only print the help msg once per handler */
+                for (i = 0; i < ARRAY_SIZE(sysrq_key_table); i++) {
+                        if (sysrq_key_table[i]) {
+                                int j;
+
+                                for (j = 0; sysrq_key_table[i] !=
+                                                sysrq_key_table[j]; j++)
+                                        ;
+                                if (j != i)
+                                        continue;
+                                printk("%s ", sysrq_key_table[i]->help_msg);
+                        }
+                }
+                printk("\n");
+                console_loglevel = orig_log_level;
+        }
+        spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
+}
+
+void handle_sysrq(int key)
+{
+        if (sysrq_on())
+                __handle_sysrq(key, true);
+}
+EXPORT_SYMBOL(handle_sysrq);
+
+#ifdef CONFIG_INPUT
+
+/* Simple translation table for the SysRq keys */
+static const unsigned char sysrq_xlate[KEY_CNT] =
+        "\000\0331234567890-=\177\t"                    /* 0x00 - 0x0f */
+        "qwertyuiop[]\r\000as"                          /* 0x10 - 0x1f */
+        "dfghjkl;'`\000\\zxcv"                          /* 0x20 - 0x2f */
+        "bnm,./\000*\000 \000\201\202\203\204\205"      /* 0x30 - 0x3f */
+        "\206\207\210\211\212\000\000789-456+1"         /* 0x40 - 0x4f */
+        "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
+        "\r\000/";                                      /* 0x60 - 0x6f */
+
+struct sysrq_state {
+        struct input_handle handle;
+        struct work_struct reinject_work;
+        unsigned long key_down[BITS_TO_LONGS(KEY_CNT)];
+        unsigned int alt;
+        unsigned int alt_use;
+        bool active;
+        bool need_reinject;
+        bool reinjecting;
+};
+
+static void sysrq_reinject_alt_sysrq(struct work_struct *work)
+{
+        struct sysrq_state *sysrq =
+                        container_of(work, struct sysrq_state, reinject_work);
+        struct input_handle *handle = &sysrq->handle;
+        unsigned int alt_code = sysrq->alt_use;
+
+        if (sysrq->need_reinject) {
+                /* we do not want the assignment to be reordered */
+                sysrq->reinjecting = true;
+                mb();
+
+                /* Simulate press and release of Alt + SysRq */
+                input_inject_event(handle, EV_KEY, alt_code, 1);
+                input_inject_event(handle, EV_KEY, KEY_SYSRQ, 1);
+                input_inject_event(handle, EV_SYN, SYN_REPORT, 1);
+
+                input_inject_event(handle, EV_KEY, KEY_SYSRQ, 0);
+                input_inject_event(handle, EV_KEY, alt_code, 0);
+                input_inject_event(handle, EV_SYN, SYN_REPORT, 1);
+
+                mb();
+                sysrq->reinjecting = false;
+        }
+}
+
+static bool sysrq_filter(struct input_handle *handle,
+                         unsigned int type, unsigned int code, int value)
+{
+        struct sysrq_state *sysrq = handle->private;
+        bool was_active = sysrq->active;
+        bool suppress;
+
+        /*
+         * Do not filter anything if we are in the process of re-injecting
+         * Alt+SysRq combination.
+         */
+        if (sysrq->reinjecting)
+                return false;
+
+        switch (type) {
+
+        case EV_SYN:
+                suppress = false;
+                break;
+
+        case EV_KEY:
+                switch (code) {
+
+                case KEY_LEFTALT:
+                case KEY_RIGHTALT:
+                        if (!value) {
+                                /* One of ALTs is being released */
+                                if (sysrq->active && code == sysrq->alt_use)
+                                        sysrq->active = false;
+
+                                sysrq->alt = KEY_RESERVED;
+
+                        } else if (value != 2) {
+                                sysrq->alt = code;
+                                sysrq->need_reinject = false;
+                        }
+                        break;
+
+                case KEY_SYSRQ:
+                        if (value == 1 && sysrq->alt != KEY_RESERVED) {
+                                sysrq->active = true;
+                                sysrq->alt_use = sysrq->alt;
+                                /*
+                                 * If nothing else will be pressed we'll need
+                                 * to re-inject Alt-SysRq keysroke.
+                                 */
+                                sysrq->need_reinject = true;
+                        }
+
+                        /*
+                         * Pretend that sysrq was never pressed at all. This
+                         * is needed to properly handle KGDB which will try
+                         * to release all keys after exiting debugger. If we
+                         * do not clear key bit it KGDB will end up sending
+                         * release events for Alt and SysRq, potentially
+                         * triggering print screen function.
+                         */
+                        if (sysrq->active)
+                                clear_bit(KEY_SYSRQ, handle->dev->key);
+
+                        break;
+
+                default:
+                        if (sysrq->active && value && value != 2) {
+                                sysrq->need_reinject = false;
+                                __handle_sysrq(sysrq_xlate[code], true);
+                        }
+                        break;
+                }
+
+                suppress = sysrq->active;
+
+                if (!sysrq->active) {
+                        /*
+                         * If we are not suppressing key presses keep track of
+                         * keyboard state so we can release keys that have been
+                         * pressed before entering SysRq mode.
+                         */
+                        if (value)
+                                set_bit(code, sysrq->key_down);
+                        else
+                                clear_bit(code, sysrq->key_down);
+
+                        if (was_active)
+                                schedule_work(&sysrq->reinject_work);
+
+                } else if (value == 0 &&
+                           test_and_clear_bit(code, sysrq->key_down)) {
+                        /*
+                         * Pass on release events for keys that was pressed before
+                         * entering SysRq mode.
+                         */
+                        suppress = false;
+                }
+                break;
+
+        default:
+                suppress = sysrq->active;
+                break;
+        }
+
+        return suppress;
+}
+
+static int sysrq_connect(struct input_handler *handler,
+                         struct input_dev *dev,
+                         const struct input_device_id *id)
+{
+        struct sysrq_state *sysrq;
+        int error;
+
+        sysrq = kzalloc(sizeof(struct sysrq_state), GFP_KERNEL);
+        if (!sysrq)
+                return -ENOMEM;
+
+        INIT_WORK(&sysrq->reinject_work, sysrq_reinject_alt_sysrq);
+
+        sysrq->handle.dev = dev;
+        sysrq->handle.handler = handler;
+        sysrq->handle.name = "sysrq";
+        sysrq->handle.private = sysrq;
+
+        error = input_register_handle(&sysrq->handle);
+        if (error) {
+                pr_err("Failed to register input sysrq handler, error %d\n",
+                        error);
+                goto err_free;
+        }
+
+        error = input_open_device(&sysrq->handle);
+        if (error) {
+                pr_err("Failed to open input device, error %d\n", error);
+                goto err_unregister;
+        }
+
+        return 0;
+
+ err_unregister:
+        input_unregister_handle(&sysrq->handle);
+ err_free:
+        kfree(sysrq);
+        return error;
+}
+
+static void sysrq_disconnect(struct input_handle *handle)
+{
+        struct sysrq_state *sysrq = handle->private;
+
+        input_close_device(handle);
+        cancel_work_sync(&sysrq->reinject_work);
+        input_unregister_handle(handle);
+        kfree(sysrq);
+}
+
+/*
+ * We are matching on KEY_LEFTALT instead of KEY_SYSRQ because not all
+ * keyboards have SysRq key predefined and so user may add it to keymap
+ * later, but we expect all such keyboards to have left alt.
+ */
+static const struct input_device_id sysrq_ids[] = {
+        {
+                .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
+                                INPUT_DEVICE_ID_MATCH_KEYBIT,
+                .evbit = { BIT_MASK(EV_KEY) },
+                .keybit = { BIT_MASK(KEY_LEFTALT) },
+        },
+        { },
+};
+
+static struct input_handler sysrq_handler = {
+        .filter         = sysrq_filter,
+        .connect        = sysrq_connect,
+        .disconnect     = sysrq_disconnect,
+        .name           = "sysrq",
+        .id_table       = sysrq_ids,
+};
+
+static bool sysrq_handler_registered;
+
+static inline void sysrq_register_handler(void)
+{
+        int error;
+
+        error = input_register_handler(&sysrq_handler);
+        if (error)
+                pr_err("Failed to register input handler, error %d", error);
+        else
+                sysrq_handler_registered = true;
+}
+
+static inline void sysrq_unregister_handler(void)
+{
+        if (sysrq_handler_registered) {
+                input_unregister_handler(&sysrq_handler);
+                sysrq_handler_registered = false;
+        }
+}
+
+#else
+
+static inline void sysrq_register_handler(void)
+{
+}
+
+static inline void sysrq_unregister_handler(void)
+{
+}
+
+#endif /* CONFIG_INPUT */
+
+int sysrq_toggle_support(int enable_mask)
+{
+        bool was_enabled = sysrq_on();
+
+        sysrq_enabled = enable_mask;
+
+        if (was_enabled != sysrq_on()) {
+                if (sysrq_on())
+                        sysrq_register_handler();
+                else
+                        sysrq_unregister_handler();
+        }
+
+        return 0;
+}
+
+static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
+                                struct sysrq_key_op *remove_op_p)
+{
+        int retval;
+        unsigned long flags;
+
+        spin_lock_irqsave(&sysrq_key_table_lock, flags);
+        if (__sysrq_get_key_op(key) == remove_op_p) {
+                __sysrq_put_key_op(key, insert_op_p);
+                retval = 0;
+        } else {
+                retval = -1;
+        }
+        spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
+        return retval;
+}
+
+int register_sysrq_key(int key, struct sysrq_key_op *op_p)
+{
+        return __sysrq_swap_key_ops(key, op_p, NULL);
+}
+EXPORT_SYMBOL(register_sysrq_key);
+
+int unregister_sysrq_key(int key, struct sysrq_key_op *op_p)
+{
+        return __sysrq_swap_key_ops(key, NULL, op_p);
+}
+EXPORT_SYMBOL(unregister_sysrq_key);
+
+#ifdef CONFIG_PROC_FS
+/*
+ * writing 'C' to /proc/sysrq-trigger is like sysrq-C
+ */
+static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
+                                   size_t count, loff_t *ppos)
+{
+        if (count) {
+                char c;
+
+                if (get_user(c, buf))
+                        return -EFAULT;
+                __handle_sysrq(c, false);
+        }
+
+        return count;
+}
+
+static const struct file_operations proc_sysrq_trigger_operations = {
+        .write          = write_sysrq_trigger,
+        .llseek         = noop_llseek,
+};
+
+static void sysrq_init_procfs(void)
+{
+        if (!proc_create("sysrq-trigger", S_IWUSR, NULL,
+                         &proc_sysrq_trigger_operations))
+                pr_err("Failed to register proc interface\n");
+}
+
+#else
+
+static inline void sysrq_init_procfs(void)
+{
+}
+
+#endif /* CONFIG_PROC_FS */
+
+static int __init sysrq_init(void)
+{
+        sysrq_init_procfs();
+
+        if (sysrq_on())
+                sysrq_register_handler();
+
+        return 0;
+}
+module_init(sysrq_init);
diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
new file mode 100644
index 000000000000..7c5866920622
--- /dev/null
+++ b/drivers/tty/tty_audit.c
@@ -0,0 +1,360 @@
+/*
+ * Creating audit events from TTY input.
+ *
+ * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.  This copyrighted
+ * material is made available to anyone wishing to use, modify, copy, or
+ * redistribute it subject to the terms and conditions of the GNU General
+ * Public License v.2.
+ *
+ * Authors: Miloslav Trmac <mitr@redhat.com>
+ */
+
+#include <linux/audit.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+
+struct tty_audit_buf {
+        atomic_t count;
+        struct mutex mutex;     /* Protects all data below */
+        int major, minor;       /* The TTY which the data is from */
+        unsigned icanon:1;
+        size_t valid;
+        unsigned char *data;    /* Allocated size N_TTY_BUF_SIZE */
+};
+
+static struct tty_audit_buf *tty_audit_buf_alloc(int major, int minor,
+                                                 int icanon)
+{
+        struct tty_audit_buf *buf;
+
+        buf = kmalloc(sizeof(*buf), GFP_KERNEL);
+        if (!buf)
+                goto err;
+        buf->data = kmalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
+        if (!buf->data)
+                goto err_buf;
+        atomic_set(&buf->count, 1);
+        mutex_init(&buf->mutex);
+        buf->major = major;
+        buf->minor = minor;
+        buf->icanon = icanon;
+        buf->valid = 0;
+        return buf;
+
+err_buf:
+        kfree(buf);
+err:
+        return NULL;
+}
+
+static void tty_audit_buf_free(struct tty_audit_buf *buf)
+{
+        WARN_ON(buf->valid != 0);
+        kfree(buf->data);
+        kfree(buf);
+}
+
+static void tty_audit_buf_put(struct tty_audit_buf *buf)
+{
+        if (atomic_dec_and_test(&buf->count))
+                tty_audit_buf_free(buf);
+}
+
+static void tty_audit_log(const char *description, struct task_struct *tsk,
+                          uid_t loginuid, unsigned sessionid, int major,
+                          int minor, unsigned char *data, size_t size)
+{
+        struct audit_buffer *ab;
+
+        ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_TTY);
+        if (ab) {
+                char name[sizeof(tsk->comm)];
+                uid_t uid = task_uid(tsk);
+
+                audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u "
+                                 "major=%d minor=%d comm=", description,
+                                 tsk->pid, uid, loginuid, sessionid,
+                                 major, minor);
+                get_task_comm(name, tsk);
+                audit_log_untrustedstring(ab, name);
+                audit_log_format(ab, " data=");
+                audit_log_n_hex(ab, data, size);
+                audit_log_end(ab);
+        }
+}
+
+/**
+ *      tty_audit_buf_push      -       Push buffered data out
+ *
+ *      Generate an audit message from the contents of @buf, which is owned by
+ *      @tsk with @loginuid.  @buf->mutex must be locked.
+ */
+static void tty_audit_buf_push(struct task_struct *tsk, uid_t loginuid,
+                               unsigned int sessionid,
+                               struct tty_audit_buf *buf)
+{
+        if (buf->valid == 0)
+                return;
+        if (audit_enabled == 0) {
+                buf->valid = 0;
+                return;
+        }
+        tty_audit_log("tty", tsk, loginuid, sessionid, buf->major, buf->minor,
+                      buf->data, buf->valid);
+        buf->valid = 0;
+}
+
+/**
+ *      tty_audit_buf_push_current      -       Push buffered data out
+ *
+ *      Generate an audit message from the contents of @buf, which is owned by
+ *      the current task.  @buf->mutex must be locked.
+ */
+static void tty_audit_buf_push_current(struct tty_audit_buf *buf)
+{
+        uid_t auid = audit_get_loginuid(current);
+        unsigned int sessionid = audit_get_sessionid(current);
+        tty_audit_buf_push(current, auid, sessionid, buf);
+}
+
+/**
+ *      tty_audit_exit  -       Handle a task exit
+ *
+ *      Make sure all buffered data is written out and deallocate the buffer.
+ *      Only needs to be called if current->signal->tty_audit_buf != %NULL.
+ */
+void tty_audit_exit(void)
+{
+        struct tty_audit_buf *buf;
+
+        spin_lock_irq(&current->sighand->siglock);
+        buf = current->signal->tty_audit_buf;
+        current->signal->tty_audit_buf = NULL;
+        spin_unlock_irq(&current->sighand->siglock);
+        if (!buf)
+                return;
+
+        mutex_lock(&buf->mutex);
+        tty_audit_buf_push_current(buf);
+        mutex_unlock(&buf->mutex);
+
+        tty_audit_buf_put(buf);
+}
+
+/**
+ *      tty_audit_fork  -       Copy TTY audit state for a new task
+ *
+ *      Set up TTY audit state in @sig from current.  @sig needs no locking.
+ */
+void tty_audit_fork(struct signal_struct *sig)
+{
+        spin_lock_irq(&current->sighand->siglock);
+        sig->audit_tty = current->signal->audit_tty;
+        spin_unlock_irq(&current->sighand->siglock);
+}
+
+/**
+ *      tty_audit_tiocsti       -       Log TIOCSTI
+ */
+void tty_audit_tiocsti(struct tty_struct *tty, char ch)
+{
+        struct tty_audit_buf *buf;
+        int major, minor, should_audit;
+
+        spin_lock_irq(&current->sighand->siglock);
+        should_audit = current->signal->audit_tty;
+        buf = current->signal->tty_audit_buf;
+        if (buf)
+                atomic_inc(&buf->count);
+        spin_unlock_irq(&current->sighand->siglock);
+
+        major = tty->driver->major;
+        minor = tty->driver->minor_start + tty->index;
+        if (buf) {
+                mutex_lock(&buf->mutex);
+                if (buf->major == major && buf->minor == minor)
+                        tty_audit_buf_push_current(buf);
+                mutex_unlock(&buf->mutex);
+                tty_audit_buf_put(buf);
+        }
+
+        if (should_audit && audit_enabled) {
+                uid_t auid;
+                unsigned int sessionid;
+
+                auid = audit_get_loginuid(current);
+                sessionid = audit_get_sessionid(current);
+                tty_audit_log("ioctl=TIOCSTI", current, auid, sessionid, major,
+                              minor, &ch, 1);
+        }
+}
+
+/**
+ * tty_audit_push_task  -       Flush task's pending audit data
+ * @tsk:                task pointer
+ * @loginuid:           sender login uid
+ * @sessionid:          sender session id
+ *
+ * Called with a ref on @tsk held. Try to lock sighand and get a
+ * reference to the tty audit buffer if available.
+ * Flush the buffer or return an appropriate error code.
+ */
+int tty_audit_push_task(struct task_struct *tsk, uid_t loginuid, u32 sessionid)
+{
+        struct tty_audit_buf *buf = ERR_PTR(-EPERM);
+        unsigned long flags;
+
+        if (!lock_task_sighand(tsk, &flags))
+                return -ESRCH;
+
+        if (tsk->signal->audit_tty) {
+                buf = tsk->signal->tty_audit_buf;
+                if (buf)
+                        atomic_inc(&buf->count);
+        }
+        unlock_task_sighand(tsk, &flags);
+
+        /*
+         * Return 0 when signal->audit_tty set
+         * but tsk->signal->tty_audit_buf == NULL.
+         */
+        if (!buf || IS_ERR(buf))
+                return PTR_ERR(buf);
+
+        mutex_lock(&buf->mutex);
+        tty_audit_buf_push(tsk, loginuid, sessionid, buf);
+        mutex_unlock(&buf->mutex);
+
+        tty_audit_buf_put(buf);
+        return 0;
+}
+
+/**
+ *      tty_audit_buf_get       -       Get an audit buffer.
+ *
+ *      Get an audit buffer for @tty, allocate it if necessary.  Return %NULL
+ *      if TTY auditing is disabled or out of memory.  Otherwise, return a new
+ *      reference to the buffer.
+ */
+static struct tty_audit_buf *tty_audit_buf_get(struct tty_struct *tty)
+{
+        struct tty_audit_buf *buf, *buf2;
+
+        buf = NULL;
+        buf2 = NULL;
+        spin_lock_irq(&current->sighand->siglock);
+        if (likely(!current->signal->audit_tty))
+                goto out;
+        buf = current->signal->tty_audit_buf;
+        if (buf) {
+                atomic_inc(&buf->count);
+                goto out;
+        }
+        spin_unlock_irq(&current->sighand->siglock);
+
+        buf2 = tty_audit_buf_alloc(tty->driver->major,
+                                   tty->driver->minor_start + tty->index,
+                                   tty->icanon);
+        if (buf2 == NULL) {
+                audit_log_lost("out of memory in TTY auditing");
+                return NULL;
+        }
+
+        spin_lock_irq(&current->sighand->siglock);
+        if (!current->signal->audit_tty)
+                goto out;
+        buf = current->signal->tty_audit_buf;
+        if (!buf) {
+                current->signal->tty_audit_buf = buf2;
+                buf = buf2;
+                buf2 = NULL;
+        }
+        atomic_inc(&buf->count);
+        /* Fall through */
+ out:
+        spin_unlock_irq(&current->sighand->siglock);
+        if (buf2)
+                tty_audit_buf_free(buf2);
+        return buf;
+}
+
+/**
+ *      tty_audit_add_data      -       Add data for TTY auditing.
+ *
+ *      Audit @data of @size from @tty, if necessary.
+ */
+void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
+                        size_t size)
+{
+        struct tty_audit_buf *buf;
+        int major, minor;
+
+        if (unlikely(size == 0))
+                return;
+
+        if (tty->driver->type == TTY_DRIVER_TYPE_PTY
+            && tty->driver->subtype == PTY_TYPE_MASTER)
+                return;
+
+        buf = tty_audit_buf_get(tty);
+        if (!buf)
+                return;
+
+        mutex_lock(&buf->mutex);
+        major = tty->driver->major;
+        minor = tty->driver->minor_start + tty->index;
+        if (buf->major != major || buf->minor != minor
+            || buf->icanon != tty->icanon) {
+                tty_audit_buf_push_current(buf);
+                buf->major = major;
+                buf->minor = minor;
+                buf->icanon = tty->icanon;
+        }
+        do {
+                size_t run;
+
+                run = N_TTY_BUF_SIZE - buf->valid;
+                if (run > size)
+                        run = size;
+                memcpy(buf->data + buf->valid, data, run);
+                buf->valid += run;
+                data += run;
+                size -= run;
+                if (buf->valid == N_TTY_BUF_SIZE)
+                        tty_audit_buf_push_current(buf);
+        } while (size != 0);
+        mutex_unlock(&buf->mutex);
+        tty_audit_buf_put(buf);
+}
+
+/**
+ *      tty_audit_push  -       Push buffered data out
+ *
+ *      Make sure no audit data is pending for @tty on the current process.
+ */
+void tty_audit_push(struct tty_struct *tty)
+{
+        struct tty_audit_buf *buf;
+
+        spin_lock_irq(&current->sighand->siglock);
+        if (likely(!current->signal->audit_tty)) {
+                spin_unlock_irq(&current->sighand->siglock);
+                return;
+        }
+        buf = current->signal->tty_audit_buf;
+        if (buf)
+                atomic_inc(&buf->count);
+        spin_unlock_irq(&current->sighand->siglock);
+
+        if (buf) {
+                int major, minor;
+
+                major = tty->driver->major;
+                minor = tty->driver->minor_start + tty->index;
+                mutex_lock(&buf->mutex);
+                if (buf->major == major && buf->minor == minor)
+                        tty_audit_buf_push_current(buf);
+                mutex_unlock(&buf->mutex);
+                tty_audit_buf_put(buf);
+        }
+}
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
new file mode 100644
index 000000000000..6c9b7cd6778a
--- /dev/null
+++ b/drivers/tty/tty_buffer.c
@@ -0,0 +1,522 @@
+/*
+ * Tty buffer allocation management
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+
+/**
+ *      tty_buffer_free_all             -       free buffers used by a tty
+ *      @tty: tty to free from
+ *
+ *      Remove all the buffers pending on a tty whether queued with data
+ *      or in the free ring. Must be called when the tty is no longer in use
+ *
+ *      Locking: none
+ */
+
+void tty_buffer_free_all(struct tty_struct *tty)
+{
+        struct tty_buffer *thead;
+        while ((thead = tty->buf.head) != NULL) {
+                tty->buf.head = thead->next;
+                kfree(thead);
+        }
+        while ((thead = tty->buf.free) != NULL) {
+                tty->buf.free = thead->next;
+                kfree(thead);
+        }
+        tty->buf.tail = NULL;
+        tty->buf.memory_used = 0;
+}
+
+/**
+ *      tty_buffer_alloc        -       allocate a tty buffer
+ *      @tty: tty device
+ *      @size: desired size (characters)
+ *
+ *      Allocate a new tty buffer to hold the desired number of characters.
+ *      Return NULL if out of memory or the allocation would exceed the
+ *      per device queue
+ *
+ *      Locking: Caller must hold tty->buf.lock
+ */
+
+static struct tty_buffer *tty_buffer_alloc(struct tty_struct *tty, size_t size)
+{
+        struct tty_buffer *p;
+
+        if (tty->buf.memory_used + size > 65536)
+                return NULL;
+        p = kmalloc(sizeof(struct tty_buffer) + 2 * size, GFP_ATOMIC);
+        if (p == NULL)
+                return NULL;
+        p->used = 0;
+        p->size = size;
+        p->next = NULL;
+        p->commit = 0;
+        p->read = 0;
+        p->char_buf_ptr = (char *)(p->data);
+        p->flag_buf_ptr = (unsigned char *)p->char_buf_ptr + size;
+        tty->buf.memory_used += size;
+        return p;
+}
+
+/**
+ *      tty_buffer_free         -       free a tty buffer
+ *      @tty: tty owning the buffer
+ *      @b: the buffer to free
+ *
+ *      Free a tty buffer, or add it to the free list according to our
+ *      internal strategy
+ *
+ *      Locking: Caller must hold tty->buf.lock
+ */
+
+static void tty_buffer_free(struct tty_struct *tty, struct tty_buffer *b)
+{
+        /* Dumb strategy for now - should keep some stats */
+        tty->buf.memory_used -= b->size;
+        WARN_ON(tty->buf.memory_used < 0);
+
+        if (b->size >= 512)
+                kfree(b);
+        else {
+                b->next = tty->buf.free;
+                tty->buf.free = b;
+        }
+}
+
+/**
+ *      __tty_buffer_flush              -       flush full tty buffers
+ *      @tty: tty to flush
+ *
+ *      flush all the buffers containing receive data. Caller must
+ *      hold the buffer lock and must have ensured no parallel flush to
+ *      ldisc is running.
+ *
+ *      Locking: Caller must hold tty->buf.lock
+ */
+
+static void __tty_buffer_flush(struct tty_struct *tty)
+{
+        struct tty_buffer *thead;
+
+        while ((thead = tty->buf.head) != NULL) {
+                tty->buf.head = thead->next;
+                tty_buffer_free(tty, thead);
+        }
+        tty->buf.tail = NULL;
+}
+
+/**
+ *      tty_buffer_flush                -       flush full tty buffers
+ *      @tty: tty to flush
+ *
+ *      flush all the buffers containing receive data. If the buffer is
+ *      being processed by flush_to_ldisc then we defer the processing
+ *      to that function
+ *
+ *      Locking: none
+ */
+
+void tty_buffer_flush(struct tty_struct *tty)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&tty->buf.lock, flags);
+
+        /* If the data is being pushed to the tty layer then we can't
+           process it here. Instead set a flag and the flush_to_ldisc
+           path will process the flush request before it exits */
+        if (test_bit(TTY_FLUSHING, &tty->flags)) {
+                set_bit(TTY_FLUSHPENDING, &tty->flags);
+                spin_unlock_irqrestore(&tty->buf.lock, flags);
+                wait_event(tty->read_wait,
+                                test_bit(TTY_FLUSHPENDING, &tty->flags) == 0);
+                return;
+        } else
+                __tty_buffer_flush(tty);
+        spin_unlock_irqrestore(&tty->buf.lock, flags);
+}
+
+/**
+ *      tty_buffer_find         -       find a free tty buffer
+ *      @tty: tty owning the buffer
+ *      @size: characters wanted
+ *
+ *      Locate an existing suitable tty buffer or if we are lacking one then
+ *      allocate a new one. We round our buffers off in 256 character chunks
+ *      to get better allocation behaviour.
+ *
+ *      Locking: Caller must hold tty->buf.lock
+ */
+
+static struct tty_buffer *tty_buffer_find(struct tty_struct *tty, size_t size)
+{
+        struct tty_buffer **tbh = &tty->buf.free;
+        while ((*tbh) != NULL) {
+                struct tty_buffer *t = *tbh;
+                if (t->size >= size) {
+                        *tbh = t->next;
+                        t->next = NULL;
+                        t->used = 0;
+                        t->commit = 0;
+                        t->read = 0;
+                        tty->buf.memory_used += t->size;
+                        return t;
+                }
+                tbh = &((*tbh)->next);
+        }
+        /* Round the buffer size out */
+        size = (size + 0xFF) & ~0xFF;
+        return tty_buffer_alloc(tty, size);
+        /* Should possibly check if this fails for the largest buffer we
+           have queued and recycle that ? */
+}
+
+/**
+ *      tty_buffer_request_room         -       grow tty buffer if needed
+ *      @tty: tty structure
+ *      @size: size desired
+ *
+ *      Make at least size bytes of linear space available for the tty
+ *      buffer. If we fail return the size we managed to find.
+ *
+ *      Locking: Takes tty->buf.lock
+ */
+int tty_buffer_request_room(struct tty_struct *tty, size_t size)
+{
+        struct tty_buffer *b, *n;
+        int left;
+        unsigned long flags;
+
+        spin_lock_irqsave(&tty->buf.lock, flags);
+
+        /* OPTIMISATION: We could keep a per tty "zero" sized buffer to
+           remove this conditional if its worth it. This would be invisible
+           to the callers */
+        if ((b = tty->buf.tail) != NULL)
+                left = b->size - b->used;
+        else
+                left = 0;
+
+        if (left < size) {
+                /* This is the slow path - looking for new buffers to use */
+                if ((n = tty_buffer_find(tty, size)) != NULL) {
+                        if (b != NULL) {
+                                b->next = n;
+                                b->commit = b->used;
+                        } else
+                                tty->buf.head = n;
+                        tty->buf.tail = n;
+                } else
+                        size = left;
+        }
+
+        spin_unlock_irqrestore(&tty->buf.lock, flags);
+        return size;
+}
+EXPORT_SYMBOL_GPL(tty_buffer_request_room);
+
+/**
+ *      tty_insert_flip_string_fixed_flag - Add characters to the tty buffer
+ *      @tty: tty structure
+ *      @chars: characters
+ *      @flag: flag value for each character
+ *      @size: size
+ *
+ *      Queue a series of bytes to the tty buffering. All the characters
+ *      passed are marked with the supplied flag. Returns the number added.
+ *
+ *      Locking: Called functions may take tty->buf.lock
+ */
+
+int tty_insert_flip_string_fixed_flag(struct tty_struct *tty,
+                const unsigned char *chars, char flag, size_t size)
+{
+        int copied = 0;
+        do {
+                int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
+                int space = tty_buffer_request_room(tty, goal);
+                struct tty_buffer *tb = tty->buf.tail;
+                /* If there is no space then tb may be NULL */
+                if (unlikely(space == 0))
+                        break;
+                memcpy(tb->char_buf_ptr + tb->used, chars, space);
+                memset(tb->flag_buf_ptr + tb->used, flag, space);
+                tb->used += space;
+                copied += space;
+                chars += space;
+                /* There is a small chance that we need to split the data over
+                   several buffers. If this is the case we must loop */
+        } while (unlikely(size > copied));
+        return copied;
+}
+EXPORT_SYMBOL(tty_insert_flip_string_fixed_flag);
+
+/**
+ *      tty_insert_flip_string_flags    -       Add characters to the tty buffer
+ *      @tty: tty structure
+ *      @chars: characters
+ *      @flags: flag bytes
+ *      @size: size
+ *
+ *      Queue a series of bytes to the tty buffering. For each character
+ *      the flags array indicates the status of the character. Returns the
+ *      number added.
+ *
+ *      Locking: Called functions may take tty->buf.lock
+ */
+
+int tty_insert_flip_string_flags(struct tty_struct *tty,
+                const unsigned char *chars, const char *flags, size_t size)
+{
+        int copied = 0;
+        do {
+                int goal = min_t(size_t, size - copied, TTY_BUFFER_PAGE);
+                int space = tty_buffer_request_room(tty, goal);
+                struct tty_buffer *tb = tty->buf.tail;
+                /* If there is no space then tb may be NULL */
+                if (unlikely(space == 0))
+                        break;
+                memcpy(tb->char_buf_ptr + tb->used, chars, space);
+                memcpy(tb->flag_buf_ptr + tb->used, flags, space);
+                tb->used += space;
+                copied += space;
+                chars += space;
+                flags += space;
+                /* There is a small chance that we need to split the data over
+                   several buffers. If this is the case we must loop */
+        } while (unlikely(size > copied));
+        return copied;
+}
+EXPORT_SYMBOL(tty_insert_flip_string_flags);
+
+/**
+ *      tty_schedule_flip       -       push characters to ldisc
+ *      @tty: tty to push from
+ *
+ *      Takes any pending buffers and transfers their ownership to the
+ *      ldisc side of the queue. It then schedules those characters for
+ *      processing by the line discipline.
+ *
+ *      Locking: Takes tty->buf.lock
+ */
+
+void tty_schedule_flip(struct tty_struct *tty)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&tty->buf.lock, flags);
+        if (tty->buf.tail != NULL)
+                tty->buf.tail->commit = tty->buf.tail->used;
+        spin_unlock_irqrestore(&tty->buf.lock, flags);
+        schedule_work(&tty->buf.work);
+}
+EXPORT_SYMBOL(tty_schedule_flip);
+
+/**
+ *      tty_prepare_flip_string         -       make room for characters
+ *      @tty: tty
+ *      @chars: return pointer for character write area
+ *      @size: desired size
+ *
+ *      Prepare a block of space in the buffer for data. Returns the length
+ *      available and buffer pointer to the space which is now allocated and
+ *      accounted for as ready for normal characters. This is used for drivers
+ *      that need their own block copy routines into the buffer. There is no
+ *      guarantee the buffer is a DMA target!
+ *
+ *      Locking: May call functions taking tty->buf.lock
+ */
+
+int tty_prepare_flip_string(struct tty_struct *tty, unsigned char **chars,
+                                                                size_t size)
+{
+        int space = tty_buffer_request_room(tty, size);
+        if (likely(space)) {
+                struct tty_buffer *tb = tty->buf.tail;
+                *chars = tb->char_buf_ptr + tb->used;
+                memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);
+                tb->used += space;
+        }
+        return space;
+}
+EXPORT_SYMBOL_GPL(tty_prepare_flip_string);
+
+/**
+ *      tty_prepare_flip_string_flags   -       make room for characters
+ *      @tty: tty
+ *      @chars: return pointer for character write area
+ *      @flags: return pointer for status flag write area
+ *      @size: desired size
+ *
+ *      Prepare a block of space in the buffer for data. Returns the length
+ *      available and buffer pointer to the space which is now allocated and
+ *      accounted for as ready for characters. This is used for drivers
+ *      that need their own block copy routines into the buffer. There is no
+ *      guarantee the buffer is a DMA target!
+ *
+ *      Locking: May call functions taking tty->buf.lock
+ */
+
+int tty_prepare_flip_string_flags(struct tty_struct *tty,
+                        unsigned char **chars, char **flags, size_t size)
+{
+        int space = tty_buffer_request_room(tty, size);
+        if (likely(space)) {
+                struct tty_buffer *tb = tty->buf.tail;
+                *chars = tb->char_buf_ptr + tb->used;
+                *flags = tb->flag_buf_ptr + tb->used;
+                tb->used += space;
+        }
+        return space;
+}
+EXPORT_SYMBOL_GPL(tty_prepare_flip_string_flags);
+
+
+
+/**
+ *      flush_to_ldisc
+ *      @work: tty structure passed from work queue.
+ *
+ *      This routine is called out of the software interrupt to flush data
+ *      from the buffer chain to the line discipline.
+ *
+ *      Locking: holds tty->buf.lock to guard buffer list. Drops the lock
+ *      while invoking the line discipline receive_buf method. The
+ *      receive_buf method is single threaded for each tty instance.
+ */
+
+static void flush_to_ldisc(struct work_struct *work)
+{
+        struct tty_struct *tty =
+                container_of(work, struct tty_struct, buf.work);
+        unsigned long   flags;
+        struct tty_ldisc *disc;
+
+        disc = tty_ldisc_ref(tty);
+        if (disc == NULL)       /*  !TTY_LDISC */
+                return;
+
+        spin_lock_irqsave(&tty->buf.lock, flags);
+
+        if (!test_and_set_bit(TTY_FLUSHING, &tty->flags)) {
+                struct tty_buffer *head;
+                while ((head = tty->buf.head) != NULL) {
+                        int count;
+                        char *char_buf;
+                        unsigned char *flag_buf;
+
+                        count = head->commit - head->read;
+                        if (!count) {
+                                if (head->next == NULL)
+                                        break;
+                                tty->buf.head = head->next;
+                                tty_buffer_free(tty, head);
+                                continue;
+                        }
+                        /* Ldisc or user is trying to flush the buffers
+                           we are feeding to the ldisc, stop feeding the
+                           line discipline as we want to empty the queue */
+                        if (test_bit(TTY_FLUSHPENDING, &tty->flags))
+                                break;
+                        if (!tty->receive_room)
+                                break;
+                        if (count > tty->receive_room)
+                                count = tty->receive_room;
+                        char_buf = head->char_buf_ptr + head->read;
+                        flag_buf = head->flag_buf_ptr + head->read;
+                        head->read += count;
+                        spin_unlock_irqrestore(&tty->buf.lock, flags);
+                        disc->ops->receive_buf(tty, char_buf,
+                                                        flag_buf, count);
+                        spin_lock_irqsave(&tty->buf.lock, flags);
+                }
+                clear_bit(TTY_FLUSHING, &tty->flags);
+        }
+
+        /* We may have a deferred request to flush the input buffer,
+           if so pull the chain under the lock and empty the queue */
+        if (test_bit(TTY_FLUSHPENDING, &tty->flags)) {
+                __tty_buffer_flush(tty);
+                clear_bit(TTY_FLUSHPENDING, &tty->flags);
+                wake_up(&tty->read_wait);
+        }
+        spin_unlock_irqrestore(&tty->buf.lock, flags);
+
+        tty_ldisc_deref(disc);
+}
+
+/**
+ *      tty_flush_to_ldisc
+ *      @tty: tty to push
+ *
+ *      Push the terminal flip buffers to the line discipline.
+ *
+ *      Must not be called from IRQ context.
+ */
+void tty_flush_to_ldisc(struct tty_struct *tty)
+{
+        flush_work(&tty->buf.work);
+}
+
+/**
+ *      tty_flip_buffer_push    -       terminal
+ *      @tty: tty to push
+ *
+ *      Queue a push of the terminal flip buffers to the line discipline. This
+ *      function must not be called from IRQ context if tty->low_latency is set.
+ *
+ *      In the event of the queue being busy for flipping the work will be
+ *      held off and retried later.
+ *
+ *      Locking: tty buffer lock. Driver locks in low latency mode.
+ */
+
+void tty_flip_buffer_push(struct tty_struct *tty)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&tty->buf.lock, flags);
+        if (tty->buf.tail != NULL)
+                tty->buf.tail->commit = tty->buf.tail->used;
+        spin_unlock_irqrestore(&tty->buf.lock, flags);
+
+        if (tty->low_latency)
+                flush_to_ldisc(&tty->buf.work);
+        else
+                schedule_work(&tty->buf.work);
+}
+EXPORT_SYMBOL(tty_flip_buffer_push);
+
+/**
+ *      tty_buffer_init         -       prepare a tty buffer structure
+ *      @tty: tty to initialise
+ *
+ *      Set up the initial state of the buffer management for a tty device.
+ *      Must be called before the other tty buffer functions are used.
+ *
+ *      Locking: none
+ */
+
+void tty_buffer_init(struct tty_struct *tty)
+{
+        spin_lock_init(&tty->buf.lock);
+        tty->buf.head = NULL;
+        tty->buf.tail = NULL;
+        tty->buf.free = NULL;
+        tty->buf.memory_used = 0;
+        INIT_WORK(&tty->buf.work, flush_to_ldisc);
+}
+
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
new file mode 100644
index 000000000000..6556f7452ba6
--- /dev/null
+++ b/drivers/tty/tty_io.c
@@ -0,0 +1,3334 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+/*
+ * 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles
+ * or rs-channels. It also implements echoing, cooked mode etc.
+ *
+ * Kill-line thanks to John T Kohl, who also corrected VMIN = VTIME = 0.
+ *
+ * Modified by Theodore Ts'o, 9/14/92, to dynamically allocate the
+ * tty_struct and tty_queue structures.  Previously there was an array
+ * of 256 tty_struct's which was statically allocated, and the
+ * tty_queue structures were allocated at boot time.  Both are now
+ * dynamically allocated only when the tty is open.
+ *
+ * Also restructured routines so that there is more of a separation
+ * between the high-level tty routines (tty_io.c and tty_ioctl.c) and
+ * the low-level tty routines (serial.c, pty.c, console.c).  This
+ * makes for cleaner and more compact code.  -TYT, 9/17/92
+ *
+ * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
+ * which can be dynamically activated and de-activated by the line
+ * discipline handling modules (like SLIP).
+ *
+ * NOTE: pay no attention to the line discipline code (yet); its
+ * interface is still subject to change in this version...
+ * -- TYT, 1/31/92
+ *
+ * Added functionality to the OPOST tty handling.  No delays, but all
+ * other bits should be there.
+ *      -- Nick Holloway <alfie@dcs.warwick.ac.uk>, 27th May 1993.
+ *
+ * Rewrote canonical mode and added more termios flags.
+ *      -- julian@uhunix.uhcc.hawaii.edu (J. Cowley), 13Jan94
+ *
+ * Reorganized FASYNC support so mouse code can share it.
+ *      -- ctm@ardi.com, 9Sep95
+ *
+ * New TIOCLINUX variants added.
+ *      -- mj@k332.feld.cvut.cz, 19-Nov-95
+ *
+ * Restrict vt switching via ioctl()
+ *      -- grif@cs.ucr.edu, 5-Dec-95
+ *
+ * Move console and virtual terminal code to more appropriate files,
+ * implement CONFIG_VT and generalize console device interface.
+ *      -- Marko Kohtala <Marko.Kohtala@hut.fi>, March 97
+ *
+ * Rewrote tty_init_dev and tty_release_dev to eliminate races.
+ *      -- Bill Hawes <whawes@star.net>, June 97
+ *
+ * Added devfs support.
+ *      -- C. Scott Ananian <cananian@alumni.princeton.edu>, 13-Jan-1998
+ *
+ * Added support for a Unix98-style ptmx device.
+ *      -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
+ *
+ * Reduced memory usage for older ARM systems
+ *      -- Russell King <rmk@arm.linux.org.uk>
+ *
+ * Move do_SAK() into process context.  Less stack use in devfs functions.
+ * alloc_tty_struct() always uses kmalloc()
+ *                       -- Andrew Morton <andrewm@uow.edu.eu> 17Mar01
+ */
+
+#include <linux/types.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/fcntl.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/devpts_fs.h>
+#include <linux/file.h>
+#include <linux/fdtable.h>
+#include <linux/console.h>
+#include <linux/timer.h>
+#include <linux/ctype.h>
+#include <linux/kd.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+#include <linux/serial.h>
+
+#include <linux/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/kbd_kern.h>
+#include <linux/vt_kern.h>
+#include <linux/selection.h>
+
+#include <linux/kmod.h>
+#include <linux/nsproxy.h>
+
+#undef TTY_DEBUG_HANGUP
+
+#define TTY_PARANOIA_CHECK 1
+#define CHECK_TTY_COUNT 1
+
+struct ktermios tty_std_termios = {     /* for the benefit of tty drivers  */
+        .c_iflag = ICRNL | IXON,
+        .c_oflag = OPOST | ONLCR,
+        .c_cflag = B38400 | CS8 | CREAD | HUPCL,
+        .c_lflag = ISIG | ICANON | ECHO | ECHOE | ECHOK |
+                   ECHOCTL | ECHOKE | IEXTEN,
+        .c_cc = INIT_C_CC,
+        .c_ispeed = 38400,
+        .c_ospeed = 38400
+};
+
+EXPORT_SYMBOL(tty_std_termios);
+
+/* This list gets poked at by procfs and various bits of boot up code. This
+   could do with some rationalisation such as pulling the tty proc function
+   into this file */
+
+LIST_HEAD(tty_drivers);                 /* linked list of tty drivers */
+
+/* Mutex to protect creating and releasing a tty. This is shared with
+   vt.c for deeply disgusting hack reasons */
+DEFINE_MUTEX(tty_mutex);
+EXPORT_SYMBOL(tty_mutex);
+
+/* Spinlock to protect the tty->tty_files list */
+DEFINE_SPINLOCK(tty_files_lock);
+
+static ssize_t tty_read(struct file *, char __user *, size_t, loff_t *);
+static ssize_t tty_write(struct file *, const char __user *, size_t, loff_t *);
+ssize_t redirected_tty_write(struct file *, const char __user *,
+                                                        size_t, loff_t *);
+static unsigned int tty_poll(struct file *, poll_table *);
+static int tty_open(struct inode *, struct file *);
+long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file *file, unsigned int cmd,
+                                unsigned long arg);
+#else
+#define tty_compat_ioctl NULL
+#endif
+static int __tty_fasync(int fd, struct file *filp, int on);
+static int tty_fasync(int fd, struct file *filp, int on);
+static void release_tty(struct tty_struct *tty, int idx);
+static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
+static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
+
+/**
+ *      alloc_tty_struct        -       allocate a tty object
+ *
+ *      Return a new empty tty structure. The data fields have not
+ *      been initialized in any way but has been zeroed
+ *
+ *      Locking: none
+ */
+
+struct tty_struct *alloc_tty_struct(void)
+{
+        return kzalloc(sizeof(struct tty_struct), GFP_KERNEL);
+}
+
+/**
+ *      free_tty_struct         -       free a disused tty
+ *      @tty: tty struct to free
+ *
+ *      Free the write buffers, tty queue and tty memory itself.
+ *
+ *      Locking: none. Must be called after tty is definitely unused
+ */
+
+void free_tty_struct(struct tty_struct *tty)
+{
+        if (tty->dev)
+                put_device(tty->dev);
+        kfree(tty->write_buf);
+        tty_buffer_free_all(tty);
+        kfree(tty);
+}
+
+static inline struct tty_struct *file_tty(struct file *file)
+{
+        return ((struct tty_file_private *)file->private_data)->tty;
+}
+
+/* Associate a new file with the tty structure */
+int tty_add_file(struct tty_struct *tty, struct file *file)
+{
+        struct tty_file_private *priv;
+
+        priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        priv->tty = tty;
+        priv->file = file;
+        file->private_data = priv;
+
+        spin_lock(&tty_files_lock);
+        list_add(&priv->list, &tty->tty_files);
+        spin_unlock(&tty_files_lock);
+
+        return 0;
+}
+
+/* Delete file from its tty */
+void tty_del_file(struct file *file)
+{
+        struct tty_file_private *priv = file->private_data;
+
+        spin_lock(&tty_files_lock);
+        list_del(&priv->list);
+        spin_unlock(&tty_files_lock);
+        file->private_data = NULL;
+        kfree(priv);
+}
+
+
+#define TTY_NUMBER(tty) ((tty)->index + (tty)->driver->name_base)
+
+/**
+ *      tty_name        -       return tty naming
+ *      @tty: tty structure
+ *      @buf: buffer for output
+ *
+ *      Convert a tty structure into a name. The name reflects the kernel
+ *      naming policy and if udev is in use may not reflect user space
+ *
+ *      Locking: none
+ */
+
+char *tty_name(struct tty_struct *tty, char *buf)
+{
+        if (!tty) /* Hmm.  NULL pointer.  That's fun. */
+                strcpy(buf, "NULL tty");
+        else
+                strcpy(buf, tty->name);
+        return buf;
+}
+
+EXPORT_SYMBOL(tty_name);
+
+int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
+                              const char *routine)
+{
+#ifdef TTY_PARANOIA_CHECK
+        if (!tty) {
+                printk(KERN_WARNING
+                        "null TTY for (%d:%d) in %s\n",
+                        imajor(inode), iminor(inode), routine);
+                return 1;
+        }
+        if (tty->magic != TTY_MAGIC) {
+                printk(KERN_WARNING
+                        "bad magic number for tty struct (%d:%d) in %s\n",
+                        imajor(inode), iminor(inode), routine);
+                return 1;
+        }
+#endif
+        return 0;
+}
+
+static int check_tty_count(struct tty_struct *tty, const char *routine)
+{
+#ifdef CHECK_TTY_COUNT
+        struct list_head *p;
+        int count = 0;
+
+        spin_lock(&tty_files_lock);
+        list_for_each(p, &tty->tty_files) {
+                count++;
+        }
+        spin_unlock(&tty_files_lock);
+        if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+            tty->driver->subtype == PTY_TYPE_SLAVE &&
+            tty->link && tty->link->count)
+                count++;
+        if (tty->count != count) {
+                printk(KERN_WARNING "Warning: dev (%s) tty->count(%d) "
+                                    "!= #fd's(%d) in %s\n",
+                       tty->name, tty->count, count, routine);
+                return count;
+        }
+#endif
+        return 0;
+}
+
+/**
+ *      get_tty_driver          -       find device of a tty
+ *      @dev_t: device identifier
+ *      @index: returns the index of the tty
+ *
+ *      This routine returns a tty driver structure, given a device number
+ *      and also passes back the index number.
+ *
+ *      Locking: caller must hold tty_mutex
+ */
+
+static struct tty_driver *get_tty_driver(dev_t device, int *index)
+{
+        struct tty_driver *p;
+
+        list_for_each_entry(p, &tty_drivers, tty_drivers) {
+                dev_t base = MKDEV(p->major, p->minor_start);
+                if (device < base || device >= base + p->num)
+                        continue;
+                *index = device - base;
+                return tty_driver_kref_get(p);
+        }
+        return NULL;
+}
+
+#ifdef CONFIG_CONSOLE_POLL
+
+/**
+ *      tty_find_polling_driver -       find device of a polled tty
+ *      @name: name string to match
+ *      @line: pointer to resulting tty line nr
+ *
+ *      This routine returns a tty driver structure, given a name
+ *      and the condition that the tty driver is capable of polled
+ *      operation.
+ */
+struct tty_driver *tty_find_polling_driver(char *name, int *line)
+{
+        struct tty_driver *p, *res = NULL;
+        int tty_line = 0;
+        int len;
+        char *str, *stp;
+
+        for (str = name; *str; str++)
+                if ((*str >= '0' && *str <= '9') || *str == ',')
+                        break;
+        if (!*str)
+                return NULL;
+
+        len = str - name;
+        tty_line = simple_strtoul(str, &str, 10);
+
+        mutex_lock(&tty_mutex);
+        /* Search through the tty devices to look for a match */
+        list_for_each_entry(p, &tty_drivers, tty_drivers) {
+                if (strncmp(name, p->name, len) != 0)
+                        continue;
+                stp = str;
+                if (*stp == ',')
+                        stp++;
+                if (*stp == '\0')
+                        stp = NULL;
+
+                if (tty_line >= 0 && tty_line < p->num && p->ops &&
+                    p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) {
+                        res = tty_driver_kref_get(p);
+                        *line = tty_line;
+                        break;
+                }
+        }
+        mutex_unlock(&tty_mutex);
+
+        return res;
+}
+EXPORT_SYMBOL_GPL(tty_find_polling_driver);
+#endif
+
+/**
+ *      tty_check_change        -       check for POSIX terminal changes
+ *      @tty: tty to check
+ *
+ *      If we try to write to, or set the state of, a terminal and we're
+ *      not in the foreground, send a SIGTTOU.  If the signal is blocked or
+ *      ignored, go ahead and perform the operation.  (POSIX 7.2)
+ *
+ *      Locking: ctrl_lock
+ */
+
+int tty_check_change(struct tty_struct *tty)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        if (current->signal->tty != tty)
+                return 0;
+
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+
+        if (!tty->pgrp) {
+                printk(KERN_WARNING "tty_check_change: tty->pgrp == NULL!\n");
+                goto out_unlock;
+        }
+        if (task_pgrp(current) == tty->pgrp)
+                goto out_unlock;
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+        if (is_ignored(SIGTTOU))
+                goto out;
+        if (is_current_pgrp_orphaned()) {
+                ret = -EIO;
+                goto out;
+        }
+        kill_pgrp(task_pgrp(current), SIGTTOU, 1);
+        set_thread_flag(TIF_SIGPENDING);
+        ret = -ERESTARTSYS;
+out:
+        return ret;
+out_unlock:
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+        return ret;
+}
+
+EXPORT_SYMBOL(tty_check_change);
+
+static ssize_t hung_up_tty_read(struct file *file, char __user *buf,
+                                size_t count, loff_t *ppos)
+{
+        return 0;
+}
+
+static ssize_t hung_up_tty_write(struct file *file, const char __user *buf,
+                                 size_t count, loff_t *ppos)
+{
+        return -EIO;
+}
+
+/* No kernel lock held - none needed ;) */
+static unsigned int hung_up_tty_poll(struct file *filp, poll_table *wait)
+{
+        return POLLIN | POLLOUT | POLLERR | POLLHUP | POLLRDNORM | POLLWRNORM;
+}
+
+static long hung_up_tty_ioctl(struct file *file, unsigned int cmd,
+                unsigned long arg)
+{
+        return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
+}
+
+static long hung_up_tty_compat_ioctl(struct file *file,
+                                     unsigned int cmd, unsigned long arg)
+{
+        return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
+}
+
+static const struct file_operations tty_fops = {
+        .llseek         = no_llseek,
+        .read           = tty_read,
+        .write          = tty_write,
+        .poll           = tty_poll,
+        .unlocked_ioctl = tty_ioctl,
+        .compat_ioctl   = tty_compat_ioctl,
+        .open           = tty_open,
+        .release        = tty_release,
+        .fasync         = tty_fasync,
+};
+
+static const struct file_operations console_fops = {
+        .llseek         = no_llseek,
+        .read           = tty_read,
+        .write          = redirected_tty_write,
+        .poll           = tty_poll,
+        .unlocked_ioctl = tty_ioctl,
+        .compat_ioctl   = tty_compat_ioctl,
+        .open           = tty_open,
+        .release        = tty_release,
+        .fasync         = tty_fasync,
+};
+
+static const struct file_operations hung_up_tty_fops = {
+        .llseek         = no_llseek,
+        .read           = hung_up_tty_read,
+        .write          = hung_up_tty_write,
+        .poll           = hung_up_tty_poll,
+        .unlocked_ioctl = hung_up_tty_ioctl,
+        .compat_ioctl   = hung_up_tty_compat_ioctl,
+        .release        = tty_release,
+};
+
+static DEFINE_SPINLOCK(redirect_lock);
+static struct file *redirect;
+
+/**
+ *      tty_wakeup      -       request more data
+ *      @tty: terminal
+ *
+ *      Internal and external helper for wakeups of tty. This function
+ *      informs the line discipline if present that the driver is ready
+ *      to receive more output data.
+ */
+
+void tty_wakeup(struct tty_struct *tty)
+{
+        struct tty_ldisc *ld;
+
+        if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) {
+                ld = tty_ldisc_ref(tty);
+                if (ld) {
+                        if (ld->ops->write_wakeup)
+                                ld->ops->write_wakeup(tty);
+                        tty_ldisc_deref(ld);
+                }
+        }
+        wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+}
+
+EXPORT_SYMBOL_GPL(tty_wakeup);
+
+/**
+ *      __tty_hangup            -       actual handler for hangup events
+ *      @work: tty device
+ *
+ *      This can be called by the "eventd" kernel thread.  That is process
+ *      synchronous but doesn't hold any locks, so we need to make sure we
+ *      have the appropriate locks for what we're doing.
+ *
+ *      The hangup event clears any pending redirections onto the hung up
+ *      device. It ensures future writes will error and it does the needed
+ *      line discipline hangup and signal delivery. The tty object itself
+ *      remains intact.
+ *
+ *      Locking:
+ *              BTM
+ *                redirect lock for undoing redirection
+ *                file list lock for manipulating list of ttys
+ *                tty_ldisc_lock from called functions
+ *                termios_mutex resetting termios data
+ *                tasklist_lock to walk task list for hangup event
+ *                  ->siglock to protect ->signal/->sighand
+ */
+void __tty_hangup(struct tty_struct *tty)
+{
+        struct file *cons_filp = NULL;
+        struct file *filp, *f = NULL;
+        struct task_struct *p;
+        struct tty_file_private *priv;
+        int    closecount = 0, n;
+        unsigned long flags;
+        int refs = 0;
+
+        if (!tty)
+                return;
+
+
+        spin_lock(&redirect_lock);
+        if (redirect && file_tty(redirect) == tty) {
+                f = redirect;
+                redirect = NULL;
+        }
+        spin_unlock(&redirect_lock);
+
+        tty_lock();
+
+        /* some functions below drop BTM, so we need this bit */
+        set_bit(TTY_HUPPING, &tty->flags);
+
+        /* inuse_filps is protected by the single tty lock,
+           this really needs to change if we want to flush the
+           workqueue with the lock held */
+        check_tty_count(tty, "tty_hangup");
+
+        spin_lock(&tty_files_lock);
+        /* This breaks for file handles being sent over AF_UNIX sockets ? */
+        list_for_each_entry(priv, &tty->tty_files, list) {
+                filp = priv->file;
+                if (filp->f_op->write == redirected_tty_write)
+                        cons_filp = filp;
+                if (filp->f_op->write != tty_write)
+                        continue;
+                closecount++;
+                __tty_fasync(-1, filp, 0);      /* can't block */
+                filp->f_op = &hung_up_tty_fops;
+        }
+        spin_unlock(&tty_files_lock);
+
+        /*
+         * it drops BTM and thus races with reopen
+         * we protect the race by TTY_HUPPING
+         */
+        tty_ldisc_hangup(tty);
+
+        read_lock(&tasklist_lock);
+        if (tty->session) {
+                do_each_pid_task(tty->session, PIDTYPE_SID, p) {
+                        spin_lock_irq(&p->sighand->siglock);
+                        if (p->signal->tty == tty) {
+                                p->signal->tty = NULL;
+                                /* We defer the dereferences outside fo
+                                   the tasklist lock */
+                                refs++;
+                        }
+                        if (!p->signal->leader) {
+                                spin_unlock_irq(&p->sighand->siglock);
+                                continue;
+                        }
+                        __group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p);
+                        __group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p);
+                        put_pid(p->signal->tty_old_pgrp);  /* A noop */
+                        spin_lock_irqsave(&tty->ctrl_lock, flags);
+                        if (tty->pgrp)
+                                p->signal->tty_old_pgrp = get_pid(tty->pgrp);
+                        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                        spin_unlock_irq(&p->sighand->siglock);
+                } while_each_pid_task(tty->session, PIDTYPE_SID, p);
+        }
+        read_unlock(&tasklist_lock);
+
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        clear_bit(TTY_THROTTLED, &tty->flags);
+        clear_bit(TTY_PUSH, &tty->flags);
+        clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+        put_pid(tty->session);
+        put_pid(tty->pgrp);
+        tty->session = NULL;
+        tty->pgrp = NULL;
+        tty->ctrl_status = 0;
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+
+        /* Account for the p->signal references we killed */
+        while (refs--)
+                tty_kref_put(tty);
+
+        /*
+         * If one of the devices matches a console pointer, we
+         * cannot just call hangup() because that will cause
+         * tty->count and state->count to go out of sync.
+         * So we just call close() the right number of times.
+         */
+        if (cons_filp) {
+                if (tty->ops->close)
+                        for (n = 0; n < closecount; n++)
+                                tty->ops->close(tty, cons_filp);
+        } else if (tty->ops->hangup)
+                (tty->ops->hangup)(tty);
+        /*
+         * We don't want to have driver/ldisc interactions beyond
+         * the ones we did here. The driver layer expects no
+         * calls after ->hangup() from the ldisc side. However we
+         * can't yet guarantee all that.
+         */
+        set_bit(TTY_HUPPED, &tty->flags);
+        clear_bit(TTY_HUPPING, &tty->flags);
+        tty_ldisc_enable(tty);
+
+        tty_unlock();
+
+        if (f)
+                fput(f);
+}
+
+static void do_tty_hangup(struct work_struct *work)
+{
+        struct tty_struct *tty =
+                container_of(work, struct tty_struct, hangup_work);
+
+        __tty_hangup(tty);
+}
+
+/**
+ *      tty_hangup              -       trigger a hangup event
+ *      @tty: tty to hangup
+ *
+ *      A carrier loss (virtual or otherwise) has occurred on this like
+ *      schedule a hangup sequence to run after this event.
+ */
+
+void tty_hangup(struct tty_struct *tty)
+{
+#ifdef TTY_DEBUG_HANGUP
+        char    buf[64];
+        printk(KERN_DEBUG "%s hangup...\n", tty_name(tty, buf));
+#endif
+        schedule_work(&tty->hangup_work);
+}
+
+EXPORT_SYMBOL(tty_hangup);
+
+/**
+ *      tty_vhangup             -       process vhangup
+ *      @tty: tty to hangup
+ *
+ *      The user has asked via system call for the terminal to be hung up.
+ *      We do this synchronously so that when the syscall returns the process
+ *      is complete. That guarantee is necessary for security reasons.
+ */
+
+void tty_vhangup(struct tty_struct *tty)
+{
+#ifdef TTY_DEBUG_HANGUP
+        char    buf[64];
+
+        printk(KERN_DEBUG "%s vhangup...\n", tty_name(tty, buf));
+#endif
+        __tty_hangup(tty);
+}
+
+EXPORT_SYMBOL(tty_vhangup);
+
+
+/**
+ *      tty_vhangup_self        -       process vhangup for own ctty
+ *
+ *      Perform a vhangup on the current controlling tty
+ */
+
+void tty_vhangup_self(void)
+{
+        struct tty_struct *tty;
+
+        tty = get_current_tty();
+        if (tty) {
+                tty_vhangup(tty);
+                tty_kref_put(tty);
+        }
+}
+
+/**
+ *      tty_hung_up_p           -       was tty hung up
+ *      @filp: file pointer of tty
+ *
+ *      Return true if the tty has been subject to a vhangup or a carrier
+ *      loss
+ */
+
+int tty_hung_up_p(struct file *filp)
+{
+        return (filp->f_op == &hung_up_tty_fops);
+}
+
+EXPORT_SYMBOL(tty_hung_up_p);
+
+static void session_clear_tty(struct pid *session)
+{
+        struct task_struct *p;
+        do_each_pid_task(session, PIDTYPE_SID, p) {
+                proc_clear_tty(p);
+        } while_each_pid_task(session, PIDTYPE_SID, p);
+}
+
+/**
+ *      disassociate_ctty       -       disconnect controlling tty
+ *      @on_exit: true if exiting so need to "hang up" the session
+ *
+ *      This function is typically called only by the session leader, when
+ *      it wants to disassociate itself from its controlling tty.
+ *
+ *      It performs the following functions:
+ *      (1)  Sends a SIGHUP and SIGCONT to the foreground process group
+ *      (2)  Clears the tty from being controlling the session
+ *      (3)  Clears the controlling tty for all processes in the
+ *              session group.
+ *
+ *      The argument on_exit is set to 1 if called when a process is
+ *      exiting; it is 0 if called by the ioctl TIOCNOTTY.
+ *
+ *      Locking:
+ *              BTM is taken for hysterical raisins, and held when
+ *                called from no_tty().
+ *                tty_mutex is taken to protect tty
+ *                ->siglock is taken to protect ->signal/->sighand
+ *                tasklist_lock is taken to walk process list for sessions
+ *                  ->siglock is taken to protect ->signal/->sighand
+ */
+
+void disassociate_ctty(int on_exit)
+{
+        struct tty_struct *tty;
+        struct pid *tty_pgrp = NULL;
+
+        if (!current->signal->leader)
+                return;
+
+        tty = get_current_tty();
+        if (tty) {
+                tty_pgrp = get_pid(tty->pgrp);
+                if (on_exit) {
+                        if (tty->driver->type != TTY_DRIVER_TYPE_PTY)
+                                tty_vhangup(tty);
+                }
+                tty_kref_put(tty);
+        } else if (on_exit) {
+                struct pid *old_pgrp;
+                spin_lock_irq(&current->sighand->siglock);
+                old_pgrp = current->signal->tty_old_pgrp;
+                current->signal->tty_old_pgrp = NULL;
+                spin_unlock_irq(&current->sighand->siglock);
+                if (old_pgrp) {
+                        kill_pgrp(old_pgrp, SIGHUP, on_exit);
+                        kill_pgrp(old_pgrp, SIGCONT, on_exit);
+                        put_pid(old_pgrp);
+                }
+                return;
+        }
+        if (tty_pgrp) {
+                kill_pgrp(tty_pgrp, SIGHUP, on_exit);
+                if (!on_exit)
+                        kill_pgrp(tty_pgrp, SIGCONT, on_exit);
+                put_pid(tty_pgrp);
+        }
+
+        spin_lock_irq(&current->sighand->siglock);
+        put_pid(current->signal->tty_old_pgrp);
+        current->signal->tty_old_pgrp = NULL;
+        spin_unlock_irq(&current->sighand->siglock);
+
+        tty = get_current_tty();
+        if (tty) {
+                unsigned long flags;
+                spin_lock_irqsave(&tty->ctrl_lock, flags);
+                put_pid(tty->session);
+                put_pid(tty->pgrp);
+                tty->session = NULL;
+                tty->pgrp = NULL;
+                spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                tty_kref_put(tty);
+        } else {
+#ifdef TTY_DEBUG_HANGUP
+                printk(KERN_DEBUG "error attempted to write to tty [0x%p]"
+                       " = NULL", tty);
+#endif
+        }
+
+        /* Now clear signal->tty under the lock */
+        read_lock(&tasklist_lock);
+        session_clear_tty(task_session(current));
+        read_unlock(&tasklist_lock);
+}
+
+/**
+ *
+ *      no_tty  - Ensure the current process does not have a controlling tty
+ */
+void no_tty(void)
+{
+        struct task_struct *tsk = current;
+        tty_lock();
+        disassociate_ctty(0);
+        tty_unlock();
+        proc_clear_tty(tsk);
+}
+
+
+/**
+ *      stop_tty        -       propagate flow control
+ *      @tty: tty to stop
+ *
+ *      Perform flow control to the driver. For PTY/TTY pairs we
+ *      must also propagate the TIOCKPKT status. May be called
+ *      on an already stopped device and will not re-call the driver
+ *      method.
+ *
+ *      This functionality is used by both the line disciplines for
+ *      halting incoming flow and by the driver. It may therefore be
+ *      called from any context, may be under the tty atomic_write_lock
+ *      but not always.
+ *
+ *      Locking:
+ *              Uses the tty control lock internally
+ */
+
+void stop_tty(struct tty_struct *tty)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        if (tty->stopped) {
+                spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                return;
+        }
+        tty->stopped = 1;
+        if (tty->link && tty->link->packet) {
+                tty->ctrl_status &= ~TIOCPKT_START;
+                tty->ctrl_status |= TIOCPKT_STOP;
+                wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
+        }
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+        if (tty->ops->stop)
+                (tty->ops->stop)(tty);
+}
+
+EXPORT_SYMBOL(stop_tty);
+
+/**
+ *      start_tty       -       propagate flow control
+ *      @tty: tty to start
+ *
+ *      Start a tty that has been stopped if at all possible. Perform
+ *      any necessary wakeups and propagate the TIOCPKT status. If this
+ *      is the tty was previous stopped and is being started then the
+ *      driver start method is invoked and the line discipline woken.
+ *
+ *      Locking:
+ *              ctrl_lock
+ */
+
+void start_tty(struct tty_struct *tty)
+{
+        unsigned long flags;
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        if (!tty->stopped || tty->flow_stopped) {
+                spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                return;
+        }
+        tty->stopped = 0;
+        if (tty->link && tty->link->packet) {
+                tty->ctrl_status &= ~TIOCPKT_STOP;
+                tty->ctrl_status |= TIOCPKT_START;
+                wake_up_interruptible_poll(&tty->link->read_wait, POLLIN);
+        }
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+        if (tty->ops->start)
+                (tty->ops->start)(tty);
+        /* If we have a running line discipline it may need kicking */
+        tty_wakeup(tty);
+}
+
+EXPORT_SYMBOL(start_tty);
+
+/**
+ *      tty_read        -       read method for tty device files
+ *      @file: pointer to tty file
+ *      @buf: user buffer
+ *      @count: size of user buffer
+ *      @ppos: unused
+ *
+ *      Perform the read system call function on this terminal device. Checks
+ *      for hung up devices before calling the line discipline method.
+ *
+ *      Locking:
+ *              Locks the line discipline internally while needed. Multiple
+ *      read calls may be outstanding in parallel.
+ */
+
+static ssize_t tty_read(struct file *file, char __user *buf, size_t count,
+                        loff_t *ppos)
+{
+        int i;
+        struct inode *inode = file->f_path.dentry->d_inode;
+        struct tty_struct *tty = file_tty(file);
+        struct tty_ldisc *ld;
+
+        if (tty_paranoia_check(tty, inode, "tty_read"))
+                return -EIO;
+        if (!tty || (test_bit(TTY_IO_ERROR, &tty->flags)))
+                return -EIO;
+
+        /* We want to wait for the line discipline to sort out in this
+           situation */
+        ld = tty_ldisc_ref_wait(tty);
+        if (ld->ops->read)
+                i = (ld->ops->read)(tty, file, buf, count);
+        else
+                i = -EIO;
+        tty_ldisc_deref(ld);
+        if (i > 0)
+                inode->i_atime = current_fs_time(inode->i_sb);
+        return i;
+}
+
+void tty_write_unlock(struct tty_struct *tty)
+        __releases(&tty->atomic_write_lock)
+{
+        mutex_unlock(&tty->atomic_write_lock);
+        wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+}
+
+int tty_write_lock(struct tty_struct *tty, int ndelay)
+        __acquires(&tty->atomic_write_lock)
+{
+        if (!mutex_trylock(&tty->atomic_write_lock)) {
+                if (ndelay)
+                        return -EAGAIN;
+                if (mutex_lock_interruptible(&tty->atomic_write_lock))
+                        return -ERESTARTSYS;
+        }
+        return 0;
+}
+
+/*
+ * Split writes up in sane blocksizes to avoid
+ * denial-of-service type attacks
+ */
+static inline ssize_t do_tty_write(
+        ssize_t (*write)(struct tty_struct *, struct file *, const unsigned char *, size_t),
+        struct tty_struct *tty,
+        struct file *file,
+        const char __user *buf,
+        size_t count)
+{
+        ssize_t ret, written = 0;
+        unsigned int chunk;
+
+        ret = tty_write_lock(tty, file->f_flags & O_NDELAY);
+        if (ret < 0)
+                return ret;
+
+        /*
+         * We chunk up writes into a temporary buffer. This
+         * simplifies low-level drivers immensely, since they
+         * don't have locking issues and user mode accesses.
+         *
+         * But if TTY_NO_WRITE_SPLIT is set, we should use a
+         * big chunk-size..
+         *
+         * The default chunk-size is 2kB, because the NTTY
+         * layer has problems with bigger chunks. It will
+         * claim to be able to handle more characters than
+         * it actually does.
+         *
+         * FIXME: This can probably go away now except that 64K chunks
+         * are too likely to fail unless switched to vmalloc...
+         */
+        chunk = 2048;
+        if (test_bit(TTY_NO_WRITE_SPLIT, &tty->flags))
+                chunk = 65536;
+        if (count < chunk)
+                chunk = count;
+
+        /* write_buf/write_cnt is protected by the atomic_write_lock mutex */
+        if (tty->write_cnt < chunk) {
+                unsigned char *buf_chunk;
+
+                if (chunk < 1024)
+                        chunk = 1024;
+
+                buf_chunk = kmalloc(chunk, GFP_KERNEL);
+                if (!buf_chunk) {
+                        ret = -ENOMEM;
+                        goto out;
+                }
+                kfree(tty->write_buf);
+                tty->write_cnt = chunk;
+                tty->write_buf = buf_chunk;
+        }
+
+        /* Do the write .. */
+        for (;;) {
+                size_t size = count;
+                if (size > chunk)
+                        size = chunk;
+                ret = -EFAULT;
+                if (copy_from_user(tty->write_buf, buf, size))
+                        break;
+                ret = write(tty, file, tty->write_buf, size);
+                if (ret <= 0)
+                        break;
+                written += ret;
+                buf += ret;
+                count -= ret;
+                if (!count)
+                        break;
+                ret = -ERESTARTSYS;
+                if (signal_pending(current))
+                        break;
+                cond_resched();
+        }
+        if (written) {
+                struct inode *inode = file->f_path.dentry->d_inode;
+                inode->i_mtime = current_fs_time(inode->i_sb);
+                ret = written;
+        }
+out:
+        tty_write_unlock(tty);
+        return ret;
+}
+
+/**
+ * tty_write_message - write a message to a certain tty, not just the console.
+ * @tty: the destination tty_struct
+ * @msg: the message to write
+ *
+ * This is used for messages that need to be redirected to a specific tty.
+ * We don't put it into the syslog queue right now maybe in the future if
+ * really needed.
+ *
+ * We must still hold the BTM and test the CLOSING flag for the moment.
+ */
+
+void tty_write_message(struct tty_struct *tty, char *msg)
+{
+        if (tty) {
+                mutex_lock(&tty->atomic_write_lock);
+                tty_lock();
+                if (tty->ops->write && !test_bit(TTY_CLOSING, &tty->flags)) {
+                        tty_unlock();
+                        tty->ops->write(tty, msg, strlen(msg));
+                } else
+                        tty_unlock();
+                tty_write_unlock(tty);
+        }
+        return;
+}
+
+
+/**
+ *      tty_write               -       write method for tty device file
+ *      @file: tty file pointer
+ *      @buf: user data to write
+ *      @count: bytes to write
+ *      @ppos: unused
+ *
+ *      Write data to a tty device via the line discipline.
+ *
+ *      Locking:
+ *              Locks the line discipline as required
+ *              Writes to the tty driver are serialized by the atomic_write_lock
+ *      and are then processed in chunks to the device. The line discipline
+ *      write method will not be invoked in parallel for each device.
+ */
+
+static ssize_t tty_write(struct file *file, const char __user *buf,
+                                                size_t count, loff_t *ppos)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        struct tty_struct *tty = file_tty(file);
+        struct tty_ldisc *ld;
+        ssize_t ret;
+
+        if (tty_paranoia_check(tty, inode, "tty_write"))
+                return -EIO;
+        if (!tty || !tty->ops->write ||
+                (test_bit(TTY_IO_ERROR, &tty->flags)))
+                        return -EIO;
+        /* Short term debug to catch buggy drivers */
+        if (tty->ops->write_room == NULL)
+                printk(KERN_ERR "tty driver %s lacks a write_room method.\n",
+                        tty->driver->name);
+        ld = tty_ldisc_ref_wait(tty);
+        if (!ld->ops->write)
+                ret = -EIO;
+        else
+                ret = do_tty_write(ld->ops->write, tty, file, buf, count);
+        tty_ldisc_deref(ld);
+        return ret;
+}
+
+ssize_t redirected_tty_write(struct file *file, const char __user *buf,
+                                                size_t count, loff_t *ppos)
+{
+        struct file *p = NULL;
+
+        spin_lock(&redirect_lock);
+        if (redirect) {
+                get_file(redirect);
+                p = redirect;
+        }
+        spin_unlock(&redirect_lock);
+
+        if (p) {
+                ssize_t res;
+                res = vfs_write(p, buf, count, &p->f_pos);
+                fput(p);
+                return res;
+        }
+        return tty_write(file, buf, count, ppos);
+}
+
+static char ptychar[] = "pqrstuvwxyzabcde";
+
+/**
+ *      pty_line_name   -       generate name for a pty
+ *      @driver: the tty driver in use
+ *      @index: the minor number
+ *      @p: output buffer of at least 6 bytes
+ *
+ *      Generate a name from a driver reference and write it to the output
+ *      buffer.
+ *
+ *      Locking: None
+ */
+static void pty_line_name(struct tty_driver *driver, int index, char *p)
+{
+        int i = index + driver->name_base;
+        /* ->name is initialized to "ttyp", but "tty" is expected */
+        sprintf(p, "%s%c%x",
+                driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name,
+                ptychar[i >> 4 & 0xf], i & 0xf);
+}
+
+/**
+ *      tty_line_name   -       generate name for a tty
+ *      @driver: the tty driver in use
+ *      @index: the minor number
+ *      @p: output buffer of at least 7 bytes
+ *
+ *      Generate a name from a driver reference and write it to the output
+ *      buffer.
+ *
+ *      Locking: None
+ */
+static void tty_line_name(struct tty_driver *driver, int index, char *p)
+{
+        sprintf(p, "%s%d", driver->name, index + driver->name_base);
+}
+
+/**
+ *      tty_driver_lookup_tty() - find an existing tty, if any
+ *      @driver: the driver for the tty
+ *      @idx:    the minor number
+ *
+ *      Return the tty, if found or ERR_PTR() otherwise.
+ *
+ *      Locking: tty_mutex must be held. If tty is found, the mutex must
+ *      be held until the 'fast-open' is also done. Will change once we
+ *      have refcounting in the driver and per driver locking
+ */
+static struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver,
+                struct inode *inode, int idx)
+{
+        struct tty_struct *tty;
+
+        if (driver->ops->lookup)
+                return driver->ops->lookup(driver, inode, idx);
+
+        tty = driver->ttys[idx];
+        return tty;
+}
+
+/**
+ *      tty_init_termios        -  helper for termios setup
+ *      @tty: the tty to set up
+ *
+ *      Initialise the termios structures for this tty. Thus runs under
+ *      the tty_mutex currently so we can be relaxed about ordering.
+ */
+
+int tty_init_termios(struct tty_struct *tty)
+{
+        struct ktermios *tp;
+        int idx = tty->index;
+
+        tp = tty->driver->termios[idx];
+        if (tp == NULL) {
+                tp = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
+                if (tp == NULL)
+                        return -ENOMEM;
+                memcpy(tp, &tty->driver->init_termios,
+                                                sizeof(struct ktermios));
+                tty->driver->termios[idx] = tp;
+        }
+        tty->termios = tp;
+        tty->termios_locked = tp + 1;
+
+        /* Compatibility until drivers always set this */
+        tty->termios->c_ispeed = tty_termios_input_baud_rate(tty->termios);
+        tty->termios->c_ospeed = tty_termios_baud_rate(tty->termios);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(tty_init_termios);
+
+/**
+ *      tty_driver_install_tty() - install a tty entry in the driver
+ *      @driver: the driver for the tty
+ *      @tty: the tty
+ *
+ *      Install a tty object into the driver tables. The tty->index field
+ *      will be set by the time this is called. This method is responsible
+ *      for ensuring any need additional structures are allocated and
+ *      configured.
+ *
+ *      Locking: tty_mutex for now
+ */
+static int tty_driver_install_tty(struct tty_driver *driver,
+                                                struct tty_struct *tty)
+{
+        int idx = tty->index;
+        int ret;
+
+        if (driver->ops->install) {
+                ret = driver->ops->install(driver, tty);
+                return ret;
+        }
+
+        if (tty_init_termios(tty) == 0) {
+                tty_driver_kref_get(driver);
+                tty->count++;
+                driver->ttys[idx] = tty;
+                return 0;
+        }
+        return -ENOMEM;
+}
+
+/**
+ *      tty_driver_remove_tty() - remove a tty from the driver tables
+ *      @driver: the driver for the tty
+ *      @idx:    the minor number
+ *
+ *      Remvoe a tty object from the driver tables. The tty->index field
+ *      will be set by the time this is called.
+ *
+ *      Locking: tty_mutex for now
+ */
+static void tty_driver_remove_tty(struct tty_driver *driver,
+                                                struct tty_struct *tty)
+{
+        if (driver->ops->remove)
+                driver->ops->remove(driver, tty);
+        else
+                driver->ttys[tty->index] = NULL;
+}
+
+/*
+ *      tty_reopen()    - fast re-open of an open tty
+ *      @tty    - the tty to open
+ *
+ *      Return 0 on success, -errno on error.
+ *
+ *      Locking: tty_mutex must be held from the time the tty was found
+ *               till this open completes.
+ */
+static int tty_reopen(struct tty_struct *tty)
+{
+        struct tty_driver *driver = tty->driver;
+
+        if (test_bit(TTY_CLOSING, &tty->flags) ||
+                        test_bit(TTY_HUPPING, &tty->flags) ||
+                        test_bit(TTY_LDISC_CHANGING, &tty->flags))
+                return -EIO;
+
+        if (driver->type == TTY_DRIVER_TYPE_PTY &&
+            driver->subtype == PTY_TYPE_MASTER) {
+                /*
+                 * special case for PTY masters: only one open permitted,
+                 * and the slave side open count is incremented as well.
+                 */
+                if (tty->count)
+                        return -EIO;
+
+                tty->link->count++;
+        }
+        tty->count++;
+        tty->driver = driver; /* N.B. why do this every time?? */
+
+        mutex_lock(&tty->ldisc_mutex);
+        WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
+        mutex_unlock(&tty->ldisc_mutex);
+
+        return 0;
+}
+
+/**
+ *      tty_init_dev            -       initialise a tty device
+ *      @driver: tty driver we are opening a device on
+ *      @idx: device index
+ *      @ret_tty: returned tty structure
+ *      @first_ok: ok to open a new device (used by ptmx)
+ *
+ *      Prepare a tty device. This may not be a "new" clean device but
+ *      could also be an active device. The pty drivers require special
+ *      handling because of this.
+ *
+ *      Locking:
+ *              The function is called under the tty_mutex, which
+ *      protects us from the tty struct or driver itself going away.
+ *
+ *      On exit the tty device has the line discipline attached and
+ *      a reference count of 1. If a pair was created for pty/tty use
+ *      and the other was a pty master then it too has a reference count of 1.
+ *
+ * WSH 06/09/97: Rewritten to remove races and properly clean up after a
+ * failed open.  The new code protects the open with a mutex, so it's
+ * really quite straightforward.  The mutex locking can probably be
+ * relaxed for the (most common) case of reopening a tty.
+ */
+
+struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
+                                                                int first_ok)
+{
+        struct tty_struct *tty;
+        int retval;
+
+        /* Check if pty master is being opened multiple times */
+        if (driver->subtype == PTY_TYPE_MASTER &&
+                (driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok) {
+                return ERR_PTR(-EIO);
+        }
+
+        /*
+         * First time open is complex, especially for PTY devices.
+         * This code guarantees that either everything succeeds and the
+         * TTY is ready for operation, or else the table slots are vacated
+         * and the allocated memory released.  (Except that the termios
+         * and locked termios may be retained.)
+         */
+
+        if (!try_module_get(driver->owner))
+                return ERR_PTR(-ENODEV);
+
+        tty = alloc_tty_struct();
+        if (!tty) {
+                retval = -ENOMEM;
+                goto err_module_put;
+        }
+        initialize_tty_struct(tty, driver, idx);
+
+        retval = tty_driver_install_tty(driver, tty);
+        if (retval < 0)
+                goto err_deinit_tty;
+
+        /*
+         * Structures all installed ... call the ldisc open routines.
+         * If we fail here just call release_tty to clean up.  No need
+         * to decrement the use counts, as release_tty doesn't care.
+         */
+        retval = tty_ldisc_setup(tty, tty->link);
+        if (retval)
+                goto err_release_tty;
+        return tty;
+
+err_deinit_tty:
+        deinitialize_tty_struct(tty);
+        free_tty_struct(tty);
+err_module_put:
+        module_put(driver->owner);
+        return ERR_PTR(retval);
+
+        /* call the tty release_tty routine to clean out this slot */
+err_release_tty:
+        if (printk_ratelimit())
+                printk(KERN_INFO "tty_init_dev: ldisc open failed, "
+                                 "clearing slot %d\n", idx);
+        release_tty(tty, idx);
+        return ERR_PTR(retval);
+}
+
+void tty_free_termios(struct tty_struct *tty)
+{
+        struct ktermios *tp;
+        int idx = tty->index;
+        /* Kill this flag and push into drivers for locking etc */
+        if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) {
+                /* FIXME: Locking on ->termios array */
+                tp = tty->termios;
+                tty->driver->termios[idx] = NULL;
+                kfree(tp);
+        }
+}
+EXPORT_SYMBOL(tty_free_termios);
+
+void tty_shutdown(struct tty_struct *tty)
+{
+        tty_driver_remove_tty(tty->driver, tty);
+        tty_free_termios(tty);
+}
+EXPORT_SYMBOL(tty_shutdown);
+
+/**
+ *      release_one_tty         -       release tty structure memory
+ *      @kref: kref of tty we are obliterating
+ *
+ *      Releases memory associated with a tty structure, and clears out the
+ *      driver table slots. This function is called when a device is no longer
+ *      in use. It also gets called when setup of a device fails.
+ *
+ *      Locking:
+ *              tty_mutex - sometimes only
+ *              takes the file list lock internally when working on the list
+ *      of ttys that the driver keeps.
+ *
+ *      This method gets called from a work queue so that the driver private
+ *      cleanup ops can sleep (needed for USB at least)
+ */
+static void release_one_tty(struct work_struct *work)
+{
+        struct tty_struct *tty =
+                container_of(work, struct tty_struct, hangup_work);
+        struct tty_driver *driver = tty->driver;
+
+        if (tty->ops->cleanup)
+                tty->ops->cleanup(tty);
+
+        tty->magic = 0;
+        tty_driver_kref_put(driver);
+        module_put(driver->owner);
+
+        spin_lock(&tty_files_lock);
+        list_del_init(&tty->tty_files);
+        spin_unlock(&tty_files_lock);
+
+        put_pid(tty->pgrp);
+        put_pid(tty->session);
+        free_tty_struct(tty);
+}
+
+static void queue_release_one_tty(struct kref *kref)
+{
+        struct tty_struct *tty = container_of(kref, struct tty_struct, kref);
+
+        if (tty->ops->shutdown)
+                tty->ops->shutdown(tty);
+        else
+                tty_shutdown(tty);
+
+        /* The hangup queue is now free so we can reuse it rather than
+           waste a chunk of memory for each port */
+        INIT_WORK(&tty->hangup_work, release_one_tty);
+        schedule_work(&tty->hangup_work);
+}
+
+/**
+ *      tty_kref_put            -       release a tty kref
+ *      @tty: tty device
+ *
+ *      Release a reference to a tty device and if need be let the kref
+ *      layer destruct the object for us
+ */
+
+void tty_kref_put(struct tty_struct *tty)
+{
+        if (tty)
+                kref_put(&tty->kref, queue_release_one_tty);
+}
+EXPORT_SYMBOL(tty_kref_put);
+
+/**
+ *      release_tty             -       release tty structure memory
+ *
+ *      Release both @tty and a possible linked partner (think pty pair),
+ *      and decrement the refcount of the backing module.
+ *
+ *      Locking:
+ *              tty_mutex - sometimes only
+ *              takes the file list lock internally when working on the list
+ *      of ttys that the driver keeps.
+ *              FIXME: should we require tty_mutex is held here ??
+ *
+ */
+static void release_tty(struct tty_struct *tty, int idx)
+{
+        /* This should always be true but check for the moment */
+        WARN_ON(tty->index != idx);
+
+        if (tty->link)
+                tty_kref_put(tty->link);
+        tty_kref_put(tty);
+}
+
+/**
+ *      tty_release             -       vfs callback for close
+ *      @inode: inode of tty
+ *      @filp: file pointer for handle to tty
+ *
+ *      Called the last time each file handle is closed that references
+ *      this tty. There may however be several such references.
+ *
+ *      Locking:
+ *              Takes bkl. See tty_release_dev
+ *
+ * Even releasing the tty structures is a tricky business.. We have
+ * to be very careful that the structures are all released at the
+ * same time, as interrupts might otherwise get the wrong pointers.
+ *
+ * WSH 09/09/97: rewritten to avoid some nasty race conditions that could
+ * lead to double frees or releasing memory still in use.
+ */
+
+int tty_release(struct inode *inode, struct file *filp)
+{
+        struct tty_struct *tty = file_tty(filp);
+        struct tty_struct *o_tty;
+        int     pty_master, tty_closing, o_tty_closing, do_sleep;
+        int     devpts;
+        int     idx;
+        char    buf[64];
+
+        if (tty_paranoia_check(tty, inode, "tty_release_dev"))
+                return 0;
+
+        tty_lock();
+        check_tty_count(tty, "tty_release_dev");
+
+        __tty_fasync(-1, filp, 0);
+
+        idx = tty->index;
+        pty_master = (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+                      tty->driver->subtype == PTY_TYPE_MASTER);
+        devpts = (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) != 0;
+        o_tty = tty->link;
+
+#ifdef TTY_PARANOIA_CHECK
+        if (idx < 0 || idx >= tty->driver->num) {
+                printk(KERN_DEBUG "tty_release_dev: bad idx when trying to "
+                                  "free (%s)\n", tty->name);
+                tty_unlock();
+                return 0;
+        }
+        if (!devpts) {
+                if (tty != tty->driver->ttys[idx]) {
+                        tty_unlock();
+                        printk(KERN_DEBUG "tty_release_dev: driver.table[%d] not tty "
+                               "for (%s)\n", idx, tty->name);
+                        return 0;
+                }
+                if (tty->termios != tty->driver->termios[idx]) {
+                        tty_unlock();
+                        printk(KERN_DEBUG "tty_release_dev: driver.termios[%d] not termios "
+                               "for (%s)\n",
+                               idx, tty->name);
+                        return 0;
+                }
+        }
+#endif
+
+#ifdef TTY_DEBUG_HANGUP
+        printk(KERN_DEBUG "tty_release_dev of %s (tty count=%d)...",
+               tty_name(tty, buf), tty->count);
+#endif
+
+#ifdef TTY_PARANOIA_CHECK
+        if (tty->driver->other &&
+             !(tty->driver->flags & TTY_DRIVER_DEVPTS_MEM)) {
+                if (o_tty != tty->driver->other->ttys[idx]) {
+                        tty_unlock();
+                        printk(KERN_DEBUG "tty_release_dev: other->table[%d] "
+                                          "not o_tty for (%s)\n",
+                               idx, tty->name);
+                        return 0 ;
+                }
+                if (o_tty->termios != tty->driver->other->termios[idx]) {
+                        tty_unlock();
+                        printk(KERN_DEBUG "tty_release_dev: other->termios[%d] "
+                                          "not o_termios for (%s)\n",
+                               idx, tty->name);
+                        return 0;
+                }
+                if (o_tty->link != tty) {
+                        tty_unlock();
+                        printk(KERN_DEBUG "tty_release_dev: bad pty pointers\n");
+                        return 0;
+                }
+        }
+#endif
+        if (tty->ops->close)
+                tty->ops->close(tty, filp);
+
+        tty_unlock();
+        /*
+         * Sanity check: if tty->count is going to zero, there shouldn't be
+         * any waiters on tty->read_wait or tty->write_wait.  We test the
+         * wait queues and kick everyone out _before_ actually starting to
+         * close.  This ensures that we won't block while releasing the tty
+         * structure.
+         *
+         * The test for the o_tty closing is necessary, since the master and
+         * slave sides may close in any order.  If the slave side closes out
+         * first, its count will be one, since the master side holds an open.
+         * Thus this test wouldn't be triggered at the time the slave closes,
+         * so we do it now.
+         *
+         * Note that it's possible for the tty to be opened again while we're
+         * flushing out waiters.  By recalculating the closing flags before
+         * each iteration we avoid any problems.
+         */
+        while (1) {
+                /* Guard against races with tty->count changes elsewhere and
+                   opens on /dev/tty */
+
+                mutex_lock(&tty_mutex);
+                tty_lock();
+                tty_closing = tty->count <= 1;
+                o_tty_closing = o_tty &&
+                        (o_tty->count <= (pty_master ? 1 : 0));
+                do_sleep = 0;
+
+                if (tty_closing) {
+                        if (waitqueue_active(&tty->read_wait)) {
+                                wake_up_poll(&tty->read_wait, POLLIN);
+                                do_sleep++;
+                        }
+                        if (waitqueue_active(&tty->write_wait)) {
+                                wake_up_poll(&tty->write_wait, POLLOUT);
+                                do_sleep++;
+                        }
+                }
+                if (o_tty_closing) {
+                        if (waitqueue_active(&o_tty->read_wait)) {
+                                wake_up_poll(&o_tty->read_wait, POLLIN);
+                                do_sleep++;
+                        }
+                        if (waitqueue_active(&o_tty->write_wait)) {
+                                wake_up_poll(&o_tty->write_wait, POLLOUT);
+                                do_sleep++;
+                        }
+                }
+                if (!do_sleep)
+                        break;
+
+                printk(KERN_WARNING "tty_release_dev: %s: read/write wait queue "
+                                    "active!\n", tty_name(tty, buf));
+                tty_unlock();
+                mutex_unlock(&tty_mutex);
+                schedule();
+        }
+
+        /*
+         * The closing flags are now consistent with the open counts on
+         * both sides, and we've completed the last operation that could
+         * block, so it's safe to proceed with closing.
+         */
+        if (pty_master) {
+                if (--o_tty->count < 0) {
+                        printk(KERN_WARNING "tty_release_dev: bad pty slave count "
+                                            "(%d) for %s\n",
+                               o_tty->count, tty_name(o_tty, buf));
+                        o_tty->count = 0;
+                }
+        }
+        if (--tty->count < 0) {
+                printk(KERN_WARNING "tty_release_dev: bad tty->count (%d) for %s\n",
+                       tty->count, tty_name(tty, buf));
+                tty->count = 0;
+        }
+
+        /*
+         * We've decremented tty->count, so we need to remove this file
+         * descriptor off the tty->tty_files list; this serves two
+         * purposes:
+         *  - check_tty_count sees the correct number of file descriptors
+         *    associated with this tty.
+         *  - do_tty_hangup no longer sees this file descriptor as
+         *    something that needs to be handled for hangups.
+         */
+        tty_del_file(filp);
+
+        /*
+         * Perform some housekeeping before deciding whether to return.
+         *
+         * Set the TTY_CLOSING flag if this was the last open.  In the
+         * case of a pty we may have to wait around for the other side
+         * to close, and TTY_CLOSING makes sure we can't be reopened.
+         */
+        if (tty_closing)
+                set_bit(TTY_CLOSING, &tty->flags);
+        if (o_tty_closing)
+                set_bit(TTY_CLOSING, &o_tty->flags);
+
+        /*
+         * If _either_ side is closing, make sure there aren't any
+         * processes that still think tty or o_tty is their controlling
+         * tty.
+         */
+        if (tty_closing || o_tty_closing) {
+                read_lock(&tasklist_lock);
+                session_clear_tty(tty->session);
+                if (o_tty)
+                        session_clear_tty(o_tty->session);
+                read_unlock(&tasklist_lock);
+        }
+
+        mutex_unlock(&tty_mutex);
+
+        /* check whether both sides are closing ... */
+        if (!tty_closing || (o_tty && !o_tty_closing)) {
+                tty_unlock();
+                return 0;
+        }
+
+#ifdef TTY_DEBUG_HANGUP
+        printk(KERN_DEBUG "freeing tty structure...");
+#endif
+        /*
+         * Ask the line discipline code to release its structures
+         */
+        tty_ldisc_release(tty, o_tty);
+        /*
+         * The release_tty function takes care of the details of clearing
+         * the slots and preserving the termios structure.
+         */
+        release_tty(tty, idx);
+
+        /* Make this pty number available for reallocation */
+        if (devpts)
+                devpts_kill_index(inode, idx);
+        tty_unlock();
+        return 0;
+}
+
+/**
+ *      tty_open                -       open a tty device
+ *      @inode: inode of device file
+ *      @filp: file pointer to tty
+ *
+ *      tty_open and tty_release keep up the tty count that contains the
+ *      number of opens done on a tty. We cannot use the inode-count, as
+ *      different inodes might point to the same tty.
+ *
+ *      Open-counting is needed for pty masters, as well as for keeping
+ *      track of serial lines: DTR is dropped when the last close happens.
+ *      (This is not done solely through tty->count, now.  - Ted 1/27/92)
+ *
+ *      The termios state of a pty is reset on first open so that
+ *      settings don't persist across reuse.
+ *
+ *      Locking: tty_mutex protects tty, get_tty_driver and tty_init_dev work.
+ *               tty->count should protect the rest.
+ *               ->siglock protects ->signal/->sighand
+ */
+
+static int tty_open(struct inode *inode, struct file *filp)
+{
+        struct tty_struct *tty = NULL;
+        int noctty, retval;
+        struct tty_driver *driver;
+        int index;
+        dev_t device = inode->i_rdev;
+        unsigned saved_flags = filp->f_flags;
+
+        nonseekable_open(inode, filp);
+
+retry_open:
+        noctty = filp->f_flags & O_NOCTTY;
+        index  = -1;
+        retval = 0;
+
+        mutex_lock(&tty_mutex);
+        tty_lock();
+
+        if (device == MKDEV(TTYAUX_MAJOR, 0)) {
+                tty = get_current_tty();
+                if (!tty) {
+                        tty_unlock();
+                        mutex_unlock(&tty_mutex);
+                        return -ENXIO;
+                }
+                driver = tty_driver_kref_get(tty->driver);
+                index = tty->index;
+                filp->f_flags |= O_NONBLOCK; /* Don't let /dev/tty block */
+                /* noctty = 1; */
+                /* FIXME: Should we take a driver reference ? */
+                tty_kref_put(tty);
+                goto got_driver;
+        }
+#ifdef CONFIG_VT
+        if (device == MKDEV(TTY_MAJOR, 0)) {
+                extern struct tty_driver *console_driver;
+                driver = tty_driver_kref_get(console_driver);
+                index = fg_console;
+                noctty = 1;
+                goto got_driver;
+        }
+#endif
+        if (device == MKDEV(TTYAUX_MAJOR, 1)) {
+                struct tty_driver *console_driver = console_device(&index);
+                if (console_driver) {
+                        driver = tty_driver_kref_get(console_driver);
+                        if (driver) {
+                                /* Don't let /dev/console block */
+                                filp->f_flags |= O_NONBLOCK;
+                                noctty = 1;
+                                goto got_driver;
+                        }
+                }
+                tty_unlock();
+                mutex_unlock(&tty_mutex);
+                return -ENODEV;
+        }
+
+        driver = get_tty_driver(device, &index);
+        if (!driver) {
+                tty_unlock();
+                mutex_unlock(&tty_mutex);
+                return -ENODEV;
+        }
+got_driver:
+        if (!tty) {
+                /* check whether we're reopening an existing tty */
+                tty = tty_driver_lookup_tty(driver, inode, index);
+
+                if (IS_ERR(tty)) {
+                        tty_unlock();
+                        mutex_unlock(&tty_mutex);
+                        return PTR_ERR(tty);
+                }
+        }
+
+        if (tty) {
+                retval = tty_reopen(tty);
+                if (retval)
+                        tty = ERR_PTR(retval);
+        } else
+                tty = tty_init_dev(driver, index, 0);
+
+        mutex_unlock(&tty_mutex);
+        tty_driver_kref_put(driver);
+        if (IS_ERR(tty)) {
+                tty_unlock();
+                return PTR_ERR(tty);
+        }
+
+        retval = tty_add_file(tty, filp);
+        if (retval) {
+                tty_unlock();
+                tty_release(inode, filp);
+                return retval;
+        }
+
+        check_tty_count(tty, "tty_open");
+        if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+            tty->driver->subtype == PTY_TYPE_MASTER)
+                noctty = 1;
+#ifdef TTY_DEBUG_HANGUP
+        printk(KERN_DEBUG "opening %s...", tty->name);
+#endif
+        if (tty->ops->open)
+                retval = tty->ops->open(tty, filp);
+        else
+                retval = -ENODEV;
+        filp->f_flags = saved_flags;
+
+        if (!retval && test_bit(TTY_EXCLUSIVE, &tty->flags) &&
+                                                !capable(CAP_SYS_ADMIN))
+                retval = -EBUSY;
+
+        if (retval) {
+#ifdef TTY_DEBUG_HANGUP
+                printk(KERN_DEBUG "error %d in opening %s...", retval,
+                       tty->name);
+#endif
+                tty_unlock(); /* need to call tty_release without BTM */
+                tty_release(inode, filp);
+                if (retval != -ERESTARTSYS)
+                        return retval;
+
+                if (signal_pending(current))
+                        return retval;
+
+                schedule();
+                /*
+                 * Need to reset f_op in case a hangup happened.
+                 */
+                tty_lock();
+                if (filp->f_op == &hung_up_tty_fops)
+                        filp->f_op = &tty_fops;
+                tty_unlock();
+                goto retry_open;
+        }
+        tty_unlock();
+
+
+        mutex_lock(&tty_mutex);
+        tty_lock();
+        spin_lock_irq(&current->sighand->siglock);
+        if (!noctty &&
+            current->signal->leader &&
+            !current->signal->tty &&
+            tty->session == NULL)
+                __proc_set_tty(current, tty);
+        spin_unlock_irq(&current->sighand->siglock);
+        tty_unlock();
+        mutex_unlock(&tty_mutex);
+        return 0;
+}
+
+
+
+/**
+ *      tty_poll        -       check tty status
+ *      @filp: file being polled
+ *      @wait: poll wait structures to update
+ *
+ *      Call the line discipline polling method to obtain the poll
+ *      status of the device.
+ *
+ *      Locking: locks called line discipline but ldisc poll method
+ *      may be re-entered freely by other callers.
+ */
+
+static unsigned int tty_poll(struct file *filp, poll_table *wait)
+{
+        struct tty_struct *tty = file_tty(filp);
+        struct tty_ldisc *ld;
+        int ret = 0;
+
+        if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode, "tty_poll"))
+                return 0;
+
+        ld = tty_ldisc_ref_wait(tty);
+        if (ld->ops->poll)
+                ret = (ld->ops->poll)(tty, filp, wait);
+        tty_ldisc_deref(ld);
+        return ret;
+}
+
+static int __tty_fasync(int fd, struct file *filp, int on)
+{
+        struct tty_struct *tty = file_tty(filp);
+        unsigned long flags;
+        int retval = 0;
+
+        if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode, "tty_fasync"))
+                goto out;
+
+        retval = fasync_helper(fd, filp, on, &tty->fasync);
+        if (retval <= 0)
+                goto out;
+
+        if (on) {
+                enum pid_type type;
+                struct pid *pid;
+                if (!waitqueue_active(&tty->read_wait))
+                        tty->minimum_to_wake = 1;
+                spin_lock_irqsave(&tty->ctrl_lock, flags);
+                if (tty->pgrp) {
+                        pid = tty->pgrp;
+                        type = PIDTYPE_PGID;
+                } else {
+                        pid = task_pid(current);
+                        type = PIDTYPE_PID;
+                }
+                get_pid(pid);
+                spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                retval = __f_setown(filp, pid, type, 0);
+                put_pid(pid);
+                if (retval)
+                        goto out;
+        } else {
+                if (!tty->fasync && !waitqueue_active(&tty->read_wait))
+                        tty->minimum_to_wake = N_TTY_BUF_SIZE;
+        }
+        retval = 0;
+out:
+        return retval;
+}
+
+static int tty_fasync(int fd, struct file *filp, int on)
+{
+        int retval;
+        tty_lock();
+        retval = __tty_fasync(fd, filp, on);
+        tty_unlock();
+        return retval;
+}
+
+/**
+ *      tiocsti                 -       fake input character
+ *      @tty: tty to fake input into
+ *      @p: pointer to character
+ *
+ *      Fake input to a tty device. Does the necessary locking and
+ *      input management.
+ *
+ *      FIXME: does not honour flow control ??
+ *
+ *      Locking:
+ *              Called functions take tty_ldisc_lock
+ *              current->signal->tty check is safe without locks
+ *
+ *      FIXME: may race normal receive processing
+ */
+
+static int tiocsti(struct tty_struct *tty, char __user *p)
+{
+        char ch, mbz = 0;
+        struct tty_ldisc *ld;
+
+        if ((current->signal->tty != tty) && !capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        if (get_user(ch, p))
+                return -EFAULT;
+        tty_audit_tiocsti(tty, ch);
+        ld = tty_ldisc_ref_wait(tty);
+        ld->ops->receive_buf(tty, &ch, &mbz, 1);
+        tty_ldisc_deref(ld);
+        return 0;
+}
+
+/**
+ *      tiocgwinsz              -       implement window query ioctl
+ *      @tty; tty
+ *      @arg: user buffer for result
+ *
+ *      Copies the kernel idea of the window size into the user buffer.
+ *
+ *      Locking: tty->termios_mutex is taken to ensure the winsize data
+ *              is consistent.
+ */
+
+static int tiocgwinsz(struct tty_struct *tty, struct winsize __user *arg)
+{
+        int err;
+
+        mutex_lock(&tty->termios_mutex);
+        err = copy_to_user(arg, &tty->winsize, sizeof(*arg));
+        mutex_unlock(&tty->termios_mutex);
+
+        return err ? -EFAULT: 0;
+}
+
+/**
+ *      tty_do_resize           -       resize event
+ *      @tty: tty being resized
+ *      @rows: rows (character)
+ *      @cols: cols (character)
+ *
+ *      Update the termios variables and send the necessary signals to
+ *      peform a terminal resize correctly
+ */
+
+int tty_do_resize(struct tty_struct *tty, struct winsize *ws)
+{
+        struct pid *pgrp;
+        unsigned long flags;
+
+        /* Lock the tty */
+        mutex_lock(&tty->termios_mutex);
+        if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
+                goto done;
+        /* Get the PID values and reference them so we can
+           avoid holding the tty ctrl lock while sending signals */
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        pgrp = get_pid(tty->pgrp);
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+
+        if (pgrp)
+                kill_pgrp(pgrp, SIGWINCH, 1);
+        put_pid(pgrp);
+
+        tty->winsize = *ws;
+done:
+        mutex_unlock(&tty->termios_mutex);
+        return 0;
+}
+
+/**
+ *      tiocswinsz              -       implement window size set ioctl
+ *      @tty; tty side of tty
+ *      @arg: user buffer for result
+ *
+ *      Copies the user idea of the window size to the kernel. Traditionally
+ *      this is just advisory information but for the Linux console it
+ *      actually has driver level meaning and triggers a VC resize.
+ *
+ *      Locking:
+ *              Driver dependent. The default do_resize method takes the
+ *      tty termios mutex and ctrl_lock. The console takes its own lock
+ *      then calls into the default method.
+ */
+
+static int tiocswinsz(struct tty_struct *tty, struct winsize __user *arg)
+{
+        struct winsize tmp_ws;
+        if (copy_from_user(&tmp_ws, arg, sizeof(*arg)))
+                return -EFAULT;
+
+        if (tty->ops->resize)
+                return tty->ops->resize(tty, &tmp_ws);
+        else
+                return tty_do_resize(tty, &tmp_ws);
+}
+
+/**
+ *      tioccons        -       allow admin to move logical console
+ *      @file: the file to become console
+ *
+ *      Allow the administrator to move the redirected console device
+ *
+ *      Locking: uses redirect_lock to guard the redirect information
+ */
+
+static int tioccons(struct file *file)
+{
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        if (file->f_op->write == redirected_tty_write) {
+                struct file *f;
+                spin_lock(&redirect_lock);
+                f = redirect;
+                redirect = NULL;
+                spin_unlock(&redirect_lock);
+                if (f)
+                        fput(f);
+                return 0;
+        }
+        spin_lock(&redirect_lock);
+        if (redirect) {
+                spin_unlock(&redirect_lock);
+                return -EBUSY;
+        }
+        get_file(file);
+        redirect = file;
+        spin_unlock(&redirect_lock);
+        return 0;
+}
+
+/**
+ *      fionbio         -       non blocking ioctl
+ *      @file: file to set blocking value
+ *      @p: user parameter
+ *
+ *      Historical tty interfaces had a blocking control ioctl before
+ *      the generic functionality existed. This piece of history is preserved
+ *      in the expected tty API of posix OS's.
+ *
+ *      Locking: none, the open file handle ensures it won't go away.
+ */
+
+static int fionbio(struct file *file, int __user *p)
+{
+        int nonblock;
+
+        if (get_user(nonblock, p))
+                return -EFAULT;
+
+        spin_lock(&file->f_lock);
+        if (nonblock)
+                file->f_flags |= O_NONBLOCK;
+        else
+                file->f_flags &= ~O_NONBLOCK;
+        spin_unlock(&file->f_lock);
+        return 0;
+}
+
+/**
+ *      tiocsctty       -       set controlling tty
+ *      @tty: tty structure
+ *      @arg: user argument
+ *
+ *      This ioctl is used to manage job control. It permits a session
+ *      leader to set this tty as the controlling tty for the session.
+ *
+ *      Locking:
+ *              Takes tty_mutex() to protect tty instance
+ *              Takes tasklist_lock internally to walk sessions
+ *              Takes ->siglock() when updating signal->tty
+ */
+
+static int tiocsctty(struct tty_struct *tty, int arg)
+{
+        int ret = 0;
+        if (current->signal->leader && (task_session(current) == tty->session))
+                return ret;
+
+        mutex_lock(&tty_mutex);
+        /*
+         * The process must be a session leader and
+         * not have a controlling tty already.
+         */
+        if (!current->signal->leader || current->signal->tty) {
+                ret = -EPERM;
+                goto unlock;
+        }
+
+        if (tty->session) {
+                /*
+                 * This tty is already the controlling
+                 * tty for another session group!
+                 */
+                if (arg == 1 && capable(CAP_SYS_ADMIN)) {
+                        /*
+                         * Steal it away
+                         */
+                        read_lock(&tasklist_lock);
+                        session_clear_tty(tty->session);
+                        read_unlock(&tasklist_lock);
+                } else {
+                        ret = -EPERM;
+                        goto unlock;
+                }
+        }
+        proc_set_tty(current, tty);
+unlock:
+        mutex_unlock(&tty_mutex);
+        return ret;
+}
+
+/**
+ *      tty_get_pgrp    -       return a ref counted pgrp pid
+ *      @tty: tty to read
+ *
+ *      Returns a refcounted instance of the pid struct for the process
+ *      group controlling the tty.
+ */
+
+struct pid *tty_get_pgrp(struct tty_struct *tty)
+{
+        unsigned long flags;
+        struct pid *pgrp;
+
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        pgrp = get_pid(tty->pgrp);
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+
+        return pgrp;
+}
+EXPORT_SYMBOL_GPL(tty_get_pgrp);
+
+/**
+ *      tiocgpgrp               -       get process group
+ *      @tty: tty passed by user
+ *      @real_tty: tty side of the tty passed by the user if a pty else the tty
+ *      @p: returned pid
+ *
+ *      Obtain the process group of the tty. If there is no process group
+ *      return an error.
+ *
+ *      Locking: none. Reference to current->signal->tty is safe.
+ */
+
+static int tiocgpgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
+{
+        struct pid *pid;
+        int ret;
+        /*
+         * (tty == real_tty) is a cheap way of
+         * testing if the tty is NOT a master pty.
+         */
+        if (tty == real_tty && current->signal->tty != real_tty)
+                return -ENOTTY;
+        pid = tty_get_pgrp(real_tty);
+        ret =  put_user(pid_vnr(pid), p);
+        put_pid(pid);
+        return ret;
+}
+
+/**
+ *      tiocspgrp               -       attempt to set process group
+ *      @tty: tty passed by user
+ *      @real_tty: tty side device matching tty passed by user
+ *      @p: pid pointer
+ *
+ *      Set the process group of the tty to the session passed. Only
+ *      permitted where the tty session is our session.
+ *
+ *      Locking: RCU, ctrl lock
+ */
+
+static int tiocspgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
+{
+        struct pid *pgrp;
+        pid_t pgrp_nr;
+        int retval = tty_check_change(real_tty);
+        unsigned long flags;
+
+        if (retval == -EIO)
+                return -ENOTTY;
+        if (retval)
+                return retval;
+        if (!current->signal->tty ||
+            (current->signal->tty != real_tty) ||
+            (real_tty->session != task_session(current)))
+                return -ENOTTY;
+        if (get_user(pgrp_nr, p))
+                return -EFAULT;
+        if (pgrp_nr < 0)
+                return -EINVAL;
+        rcu_read_lock();
+        pgrp = find_vpid(pgrp_nr);
+        retval = -ESRCH;
+        if (!pgrp)
+                goto out_unlock;
+        retval = -EPERM;
+        if (session_of_pgrp(pgrp) != task_session(current))
+                goto out_unlock;
+        retval = 0;
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        put_pid(real_tty->pgrp);
+        real_tty->pgrp = get_pid(pgrp);
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+out_unlock:
+        rcu_read_unlock();
+        return retval;
+}
+
+/**
+ *      tiocgsid                -       get session id
+ *      @tty: tty passed by user
+ *      @real_tty: tty side of the tty passed by the user if a pty else the tty
+ *      @p: pointer to returned session id
+ *
+ *      Obtain the session id of the tty. If there is no session
+ *      return an error.
+ *
+ *      Locking: none. Reference to current->signal->tty is safe.
+ */
+
+static int tiocgsid(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
+{
+        /*
+         * (tty == real_tty) is a cheap way of
+         * testing if the tty is NOT a master pty.
+        */
+        if (tty == real_tty && current->signal->tty != real_tty)
+                return -ENOTTY;
+        if (!real_tty->session)
+                return -ENOTTY;
+        return put_user(pid_vnr(real_tty->session), p);
+}
+
+/**
+ *      tiocsetd        -       set line discipline
+ *      @tty: tty device
+ *      @p: pointer to user data
+ *
+ *      Set the line discipline according to user request.
+ *
+ *      Locking: see tty_set_ldisc, this function is just a helper
+ */
+
+static int tiocsetd(struct tty_struct *tty, int __user *p)
+{
+        int ldisc;
+        int ret;
+
+        if (get_user(ldisc, p))
+                return -EFAULT;
+
+        ret = tty_set_ldisc(tty, ldisc);
+
+        return ret;
+}
+
+/**
+ *      send_break      -       performed time break
+ *      @tty: device to break on
+ *      @duration: timeout in mS
+ *
+ *      Perform a timed break on hardware that lacks its own driver level
+ *      timed break functionality.
+ *
+ *      Locking:
+ *              atomic_write_lock serializes
+ *
+ */
+
+static int send_break(struct tty_struct *tty, unsigned int duration)
+{
+        int retval;
+
+        if (tty->ops->break_ctl == NULL)
+                return 0;
+
+        if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK)
+                retval = tty->ops->break_ctl(tty, duration);
+        else {
+                /* Do the work ourselves */
+                if (tty_write_lock(tty, 0) < 0)
+                        return -EINTR;
+                retval = tty->ops->break_ctl(tty, -1);
+                if (retval)
+                        goto out;
+                if (!signal_pending(current))
+                        msleep_interruptible(duration);
+                retval = tty->ops->break_ctl(tty, 0);
+out:
+                tty_write_unlock(tty);
+                if (signal_pending(current))
+                        retval = -EINTR;
+        }
+        return retval;
+}
+
+/**
+ *      tty_tiocmget            -       get modem status
+ *      @tty: tty device
+ *      @file: user file pointer
+ *      @p: pointer to result
+ *
+ *      Obtain the modem status bits from the tty driver if the feature
+ *      is supported. Return -EINVAL if it is not available.
+ *
+ *      Locking: none (up to the driver)
+ */
+
+static int tty_tiocmget(struct tty_struct *tty, int __user *p)
+{
+        int retval = -EINVAL;
+
+        if (tty->ops->tiocmget) {
+                retval = tty->ops->tiocmget(tty);
+
+                if (retval >= 0)
+                        retval = put_user(retval, p);
+        }
+        return retval;
+}
+
+/**
+ *      tty_tiocmset            -       set modem status
+ *      @tty: tty device
+ *      @cmd: command - clear bits, set bits or set all
+ *      @p: pointer to desired bits
+ *
+ *      Set the modem status bits from the tty driver if the feature
+ *      is supported. Return -EINVAL if it is not available.
+ *
+ *      Locking: none (up to the driver)
+ */
+
+static int tty_tiocmset(struct tty_struct *tty, unsigned int cmd,
+             unsigned __user *p)
+{
+        int retval;
+        unsigned int set, clear, val;
+
+        if (tty->ops->tiocmset == NULL)
+                return -EINVAL;
+
+        retval = get_user(val, p);
+        if (retval)
+                return retval;
+        set = clear = 0;
+        switch (cmd) {
+        case TIOCMBIS:
+                set = val;
+                break;
+        case TIOCMBIC:
+                clear = val;
+                break;
+        case TIOCMSET:
+                set = val;
+                clear = ~val;
+                break;
+        }
+        set &= TIOCM_DTR|TIOCM_RTS|TIOCM_OUT1|TIOCM_OUT2|TIOCM_LOOP;
+        clear &= TIOCM_DTR|TIOCM_RTS|TIOCM_OUT1|TIOCM_OUT2|TIOCM_LOOP;
+        return tty->ops->tiocmset(tty, set, clear);
+}
+
+static int tty_tiocgicount(struct tty_struct *tty, void __user *arg)
+{
+        int retval = -EINVAL;
+        struct serial_icounter_struct icount;
+        memset(&icount, 0, sizeof(icount));
+        if (tty->ops->get_icount)
+                retval = tty->ops->get_icount(tty, &icount);
+        if (retval != 0)
+                return retval;
+        if (copy_to_user(arg, &icount, sizeof(icount)))
+                return -EFAULT;
+        return 0;
+}
+
+struct tty_struct *tty_pair_get_tty(struct tty_struct *tty)
+{
+        if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+            tty->driver->subtype == PTY_TYPE_MASTER)
+                tty = tty->link;
+        return tty;
+}
+EXPORT_SYMBOL(tty_pair_get_tty);
+
+struct tty_struct *tty_pair_get_pty(struct tty_struct *tty)
+{
+        if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+            tty->driver->subtype == PTY_TYPE_MASTER)
+            return tty;
+        return tty->link;
+}
+EXPORT_SYMBOL(tty_pair_get_pty);
+
+/*
+ * Split this up, as gcc can choke on it otherwise..
+ */
+long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct tty_struct *tty = file_tty(file);
+        struct tty_struct *real_tty;
+        void __user *p = (void __user *)arg;
+        int retval;
+        struct tty_ldisc *ld;
+        struct inode *inode = file->f_dentry->d_inode;
+
+        if (tty_paranoia_check(tty, inode, "tty_ioctl"))
+                return -EINVAL;
+
+        real_tty = tty_pair_get_tty(tty);
+
+        /*
+         * Factor out some common prep work
+         */
+        switch (cmd) {
+        case TIOCSETD:
+        case TIOCSBRK:
+        case TIOCCBRK:
+        case TCSBRK:
+        case TCSBRKP:
+                retval = tty_check_change(tty);
+                if (retval)
+                        return retval;
+                if (cmd != TIOCCBRK) {
+                        tty_wait_until_sent(tty, 0);
+                        if (signal_pending(current))
+                                return -EINTR;
+                }
+                break;
+        }
+
+        /*
+         *      Now do the stuff.
+         */
+        switch (cmd) {
+        case TIOCSTI:
+                return tiocsti(tty, p);
+        case TIOCGWINSZ:
+                return tiocgwinsz(real_tty, p);
+        case TIOCSWINSZ:
+                return tiocswinsz(real_tty, p);
+        case TIOCCONS:
+                return real_tty != tty ? -EINVAL : tioccons(file);
+        case FIONBIO:
+                return fionbio(file, p);
+        case TIOCEXCL:
+                set_bit(TTY_EXCLUSIVE, &tty->flags);
+                return 0;
+        case TIOCNXCL:
+                clear_bit(TTY_EXCLUSIVE, &tty->flags);
+                return 0;
+        case TIOCNOTTY:
+                if (current->signal->tty != tty)
+                        return -ENOTTY;
+                no_tty();
+                return 0;
+        case TIOCSCTTY:
+                return tiocsctty(tty, arg);
+        case TIOCGPGRP:
+                return tiocgpgrp(tty, real_tty, p);
+        case TIOCSPGRP:
+                return tiocspgrp(tty, real_tty, p);
+        case TIOCGSID:
+                return tiocgsid(tty, real_tty, p);
+        case TIOCGETD:
+                return put_user(tty->ldisc->ops->num, (int __user *)p);
+        case TIOCSETD:
+                return tiocsetd(tty, p);
+        case TIOCVHANGUP:
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EPERM;
+                tty_vhangup(tty);
+                return 0;
+        case TIOCGDEV:
+        {
+                unsigned int ret = new_encode_dev(tty_devnum(real_tty));
+                return put_user(ret, (unsigned int __user *)p);
+        }
+        /*
+         * Break handling
+         */
+        case TIOCSBRK:  /* Turn break on, unconditionally */
+                if (tty->ops->break_ctl)
+                        return tty->ops->break_ctl(tty, -1);
+                return 0;
+        case TIOCCBRK:  /* Turn break off, unconditionally */
+                if (tty->ops->break_ctl)
+                        return tty->ops->break_ctl(tty, 0);
+                return 0;
+        case TCSBRK:   /* SVID version: non-zero arg --> no break */
+                /* non-zero arg means wait for all output data
+                 * to be sent (performed above) but don't send break.
+                 * This is used by the tcdrain() termios function.
+                 */
+                if (!arg)
+                        return send_break(tty, 250);
+                return 0;
+        case TCSBRKP:   /* support for POSIX tcsendbreak() */
+                return send_break(tty, arg ? arg*100 : 250);
+
+        case TIOCMGET:
+                return tty_tiocmget(tty, p);
+        case TIOCMSET:
+        case TIOCMBIC:
+        case TIOCMBIS:
+                return tty_tiocmset(tty, cmd, p);
+        case TIOCGICOUNT:
+                retval = tty_tiocgicount(tty, p);
+                /* For the moment allow fall through to the old method */
+                if (retval != -EINVAL)
+                        return retval;
+                break;
+        case TCFLSH:
+                switch (arg) {
+                case TCIFLUSH:
+                case TCIOFLUSH:
+                /* flush tty buffer and allow ldisc to process ioctl */
+                        tty_buffer_flush(tty);
+                        break;
+                }
+                break;
+        }
+        if (tty->ops->ioctl) {
+                retval = (tty->ops->ioctl)(tty, cmd, arg);
+                if (retval != -ENOIOCTLCMD)
+                        return retval;
+        }
+        ld = tty_ldisc_ref_wait(tty);
+        retval = -EINVAL;
+        if (ld->ops->ioctl) {
+                retval = ld->ops->ioctl(tty, file, cmd, arg);
+                if (retval == -ENOIOCTLCMD)
+                        retval = -EINVAL;
+        }
+        tty_ldisc_deref(ld);
+        return retval;
+}
+
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file *file, unsigned int cmd,
+                                unsigned long arg)
+{
+        struct inode *inode = file->f_dentry->d_inode;
+        struct tty_struct *tty = file_tty(file);
+        struct tty_ldisc *ld;
+        int retval = -ENOIOCTLCMD;
+
+        if (tty_paranoia_check(tty, inode, "tty_ioctl"))
+                return -EINVAL;
+
+        if (tty->ops->compat_ioctl) {
+                retval = (tty->ops->compat_ioctl)(tty, cmd, arg);
+                if (retval != -ENOIOCTLCMD)
+                        return retval;
+        }
+
+        ld = tty_ldisc_ref_wait(tty);
+        if (ld->ops->compat_ioctl)
+                retval = ld->ops->compat_ioctl(tty, file, cmd, arg);
+        tty_ldisc_deref(ld);
+
+        return retval;
+}
+#endif
+
+/*
+ * This implements the "Secure Attention Key" ---  the idea is to
+ * prevent trojan horses by killing all processes associated with this
+ * tty when the user hits the "Secure Attention Key".  Required for
+ * super-paranoid applications --- see the Orange Book for more details.
+ *
+ * This code could be nicer; ideally it should send a HUP, wait a few
+ * seconds, then send a INT, and then a KILL signal.  But you then
+ * have to coordinate with the init process, since all processes associated
+ * with the current tty must be dead before the new getty is allowed
+ * to spawn.
+ *
+ * Now, if it would be correct ;-/ The current code has a nasty hole -
+ * it doesn't catch files in flight. We may send the descriptor to ourselves
+ * via AF_UNIX socket, close it and later fetch from socket. FIXME.
+ *
+ * Nasty bug: do_SAK is being called in interrupt context.  This can
+ * deadlock.  We punt it up to process context.  AKPM - 16Mar2001
+ */
+void __do_SAK(struct tty_struct *tty)
+{
+#ifdef TTY_SOFT_SAK
+        tty_hangup(tty);
+#else
+        struct task_struct *g, *p;
+        struct pid *session;
+        int             i;
+        struct file     *filp;
+        struct fdtable *fdt;
+
+        if (!tty)
+                return;
+        session = tty->session;
+
+        tty_ldisc_flush(tty);
+
+        tty_driver_flush_buffer(tty);
+
+        read_lock(&tasklist_lock);
+        /* Kill the entire session */
+        do_each_pid_task(session, PIDTYPE_SID, p) {
+                printk(KERN_NOTICE "SAK: killed process %d"
+                        " (%s): task_session(p)==tty->session\n",
+                        task_pid_nr(p), p->comm);
+                send_sig(SIGKILL, p, 1);
+        } while_each_pid_task(session, PIDTYPE_SID, p);
+        /* Now kill any processes that happen to have the
+         * tty open.
+         */
+        do_each_thread(g, p) {
+                if (p->signal->tty == tty) {
+                        printk(KERN_NOTICE "SAK: killed process %d"
+                            " (%s): task_session(p)==tty->session\n",
+                            task_pid_nr(p), p->comm);
+                        send_sig(SIGKILL, p, 1);
+                        continue;
+                }
+                task_lock(p);
+                if (p->files) {
+                        /*
+                         * We don't take a ref to the file, so we must
+                         * hold ->file_lock instead.
+                         */
+                        spin_lock(&p->files->file_lock);
+                        fdt = files_fdtable(p->files);
+                        for (i = 0; i < fdt->max_fds; i++) {
+                                filp = fcheck_files(p->files, i);
+                                if (!filp)
+                                        continue;
+                                if (filp->f_op->read == tty_read &&
+                                    file_tty(filp) == tty) {
+                                        printk(KERN_NOTICE "SAK: killed process %d"
+                                            " (%s): fd#%d opened to the tty\n",
+                                            task_pid_nr(p), p->comm, i);
+                                        force_sig(SIGKILL, p);
+                                        break;
+                                }
+                        }
+                        spin_unlock(&p->files->file_lock);
+                }
+                task_unlock(p);
+        } while_each_thread(g, p);
+        read_unlock(&tasklist_lock);
+#endif
+}
+
+static void do_SAK_work(struct work_struct *work)
+{
+        struct tty_struct *tty =
+                container_of(work, struct tty_struct, SAK_work);
+        __do_SAK(tty);
+}
+
+/*
+ * The tq handling here is a little racy - tty->SAK_work may already be queued.
+ * Fortunately we don't need to worry, because if ->SAK_work is already queued,
+ * the values which we write to it will be identical to the values which it
+ * already has. --akpm
+ */
+void do_SAK(struct tty_struct *tty)
+{
+        if (!tty)
+                return;
+        schedule_work(&tty->SAK_work);
+}
+
+EXPORT_SYMBOL(do_SAK);
+
+static int dev_match_devt(struct device *dev, void *data)
+{
+        dev_t *devt = data;
+        return dev->devt == *devt;
+}
+
+/* Must put_device() after it's unused! */
+static struct device *tty_get_device(struct tty_struct *tty)
+{
+        dev_t devt = tty_devnum(tty);
+        return class_find_device(tty_class, NULL, &devt, dev_match_devt);
+}
+
+
+/**
+ *      initialize_tty_struct
+ *      @tty: tty to initialize
+ *
+ *      This subroutine initializes a tty structure that has been newly
+ *      allocated.
+ *
+ *      Locking: none - tty in question must not be exposed at this point
+ */
+
+void initialize_tty_struct(struct tty_struct *tty,
+                struct tty_driver *driver, int idx)
+{
+        memset(tty, 0, sizeof(struct tty_struct));
+        kref_init(&tty->kref);
+        tty->magic = TTY_MAGIC;
+        tty_ldisc_init(tty);
+        tty->session = NULL;
+        tty->pgrp = NULL;
+        tty->overrun_time = jiffies;
+        tty->buf.head = tty->buf.tail = NULL;
+        tty_buffer_init(tty);
+        mutex_init(&tty->termios_mutex);
+        mutex_init(&tty->ldisc_mutex);
+        init_waitqueue_head(&tty->write_wait);
+        init_waitqueue_head(&tty->read_wait);
+        INIT_WORK(&tty->hangup_work, do_tty_hangup);
+        mutex_init(&tty->atomic_read_lock);
+        mutex_init(&tty->atomic_write_lock);
+        mutex_init(&tty->output_lock);
+        mutex_init(&tty->echo_lock);
+        spin_lock_init(&tty->read_lock);
+        spin_lock_init(&tty->ctrl_lock);
+        INIT_LIST_HEAD(&tty->tty_files);
+        INIT_WORK(&tty->SAK_work, do_SAK_work);
+
+        tty->driver = driver;
+        tty->ops = driver->ops;
+        tty->index = idx;
+        tty_line_name(driver, idx, tty->name);
+        tty->dev = tty_get_device(tty);
+}
+
+/**
+ *      deinitialize_tty_struct
+ *      @tty: tty to deinitialize
+ *
+ *      This subroutine deinitializes a tty structure that has been newly
+ *      allocated but tty_release cannot be called on that yet.
+ *
+ *      Locking: none - tty in question must not be exposed at this point
+ */
+void deinitialize_tty_struct(struct tty_struct *tty)
+{
+        tty_ldisc_deinit(tty);
+}
+
+/**
+ *      tty_put_char    -       write one character to a tty
+ *      @tty: tty
+ *      @ch: character
+ *
+ *      Write one byte to the tty using the provided put_char method
+ *      if present. Returns the number of characters successfully output.
+ *
+ *      Note: the specific put_char operation in the driver layer may go
+ *      away soon. Don't call it directly, use this method
+ */
+
+int tty_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        if (tty->ops->put_char)
+                return tty->ops->put_char(tty, ch);
+        return tty->ops->write(tty, &ch, 1);
+}
+EXPORT_SYMBOL_GPL(tty_put_char);
+
+struct class *tty_class;
+
+/**
+ *      tty_register_device - register a tty device
+ *      @driver: the tty driver that describes the tty device
+ *      @index: the index in the tty driver for this tty device
+ *      @device: a struct device that is associated with this tty device.
+ *              This field is optional, if there is no known struct device
+ *              for this tty device it can be set to NULL safely.
+ *
+ *      Returns a pointer to the struct device for this tty device
+ *      (or ERR_PTR(-EFOO) on error).
+ *
+ *      This call is required to be made to register an individual tty device
+ *      if the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set.  If
+ *      that bit is not set, this function should not be called by a tty
+ *      driver.
+ *
+ *      Locking: ??
+ */
+
+struct device *tty_register_device(struct tty_driver *driver, unsigned index,
+                                   struct device *device)
+{
+        char name[64];
+        dev_t dev = MKDEV(driver->major, driver->minor_start) + index;
+
+        if (index >= driver->num) {
+                printk(KERN_ERR "Attempt to register invalid tty line number "
+                       " (%d).\n", index);
+                return ERR_PTR(-EINVAL);
+        }
+
+        if (driver->type == TTY_DRIVER_TYPE_PTY)
+                pty_line_name(driver, index, name);
+        else
+                tty_line_name(driver, index, name);
+
+        return device_create(tty_class, device, dev, NULL, name);
+}
+EXPORT_SYMBOL(tty_register_device);
+
+/**
+ *      tty_unregister_device - unregister a tty device
+ *      @driver: the tty driver that describes the tty device
+ *      @index: the index in the tty driver for this tty device
+ *
+ *      If a tty device is registered with a call to tty_register_device() then
+ *      this function must be called when the tty device is gone.
+ *
+ *      Locking: ??
+ */
+
+void tty_unregister_device(struct tty_driver *driver, unsigned index)
+{
+        device_destroy(tty_class,
+                MKDEV(driver->major, driver->minor_start) + index);
+}
+EXPORT_SYMBOL(tty_unregister_device);
+
+struct tty_driver *alloc_tty_driver(int lines)
+{
+        struct tty_driver *driver;
+
+        driver = kzalloc(sizeof(struct tty_driver), GFP_KERNEL);
+        if (driver) {
+                kref_init(&driver->kref);
+                driver->magic = TTY_DRIVER_MAGIC;
+                driver->num = lines;
+                /* later we'll move allocation of tables here */
+        }
+        return driver;
+}
+EXPORT_SYMBOL(alloc_tty_driver);
+
+static void destruct_tty_driver(struct kref *kref)
+{
+        struct tty_driver *driver = container_of(kref, struct tty_driver, kref);
+        int i;
+        struct ktermios *tp;
+        void *p;
+
+        if (driver->flags & TTY_DRIVER_INSTALLED) {
+                /*
+                 * Free the termios and termios_locked structures because
+                 * we don't want to get memory leaks when modular tty
+                 * drivers are removed from the kernel.
+                 */
+                for (i = 0; i < driver->num; i++) {
+                        tp = driver->termios[i];
+                        if (tp) {
+                                driver->termios[i] = NULL;
+                                kfree(tp);
+                        }
+                        if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV))
+                                tty_unregister_device(driver, i);
+                }
+                p = driver->ttys;
+                proc_tty_unregister_driver(driver);
+                driver->ttys = NULL;
+                driver->termios = NULL;
+                kfree(p);
+                cdev_del(&driver->cdev);
+        }
+        kfree(driver);
+}
+
+void tty_driver_kref_put(struct tty_driver *driver)
+{
+        kref_put(&driver->kref, destruct_tty_driver);
+}
+EXPORT_SYMBOL(tty_driver_kref_put);
+
+void tty_set_operations(struct tty_driver *driver,
+                        const struct tty_operations *op)
+{
+        driver->ops = op;
+};
+EXPORT_SYMBOL(tty_set_operations);
+
+void put_tty_driver(struct tty_driver *d)
+{
+        tty_driver_kref_put(d);
+}
+EXPORT_SYMBOL(put_tty_driver);
+
+/*
+ * Called by a tty driver to register itself.
+ */
+int tty_register_driver(struct tty_driver *driver)
+{
+        int error;
+        int i;
+        dev_t dev;
+        void **p = NULL;
+        struct device *d;
+
+        if (!(driver->flags & TTY_DRIVER_DEVPTS_MEM) && driver->num) {
+                p = kzalloc(driver->num * 2 * sizeof(void *), GFP_KERNEL);
+                if (!p)
+                        return -ENOMEM;
+        }
+
+        if (!driver->major) {
+                error = alloc_chrdev_region(&dev, driver->minor_start,
+                                                driver->num, driver->name);
+                if (!error) {
+                        driver->major = MAJOR(dev);
+                        driver->minor_start = MINOR(dev);
+                }
+        } else {
+                dev = MKDEV(driver->major, driver->minor_start);
+                error = register_chrdev_region(dev, driver->num, driver->name);
+        }
+        if (error < 0) {
+                kfree(p);
+                return error;
+        }
+
+        if (p) {
+                driver->ttys = (struct tty_struct **)p;
+                driver->termios = (struct ktermios **)(p + driver->num);
+        } else {
+                driver->ttys = NULL;
+                driver->termios = NULL;
+        }
+
+        cdev_init(&driver->cdev, &tty_fops);
+        driver->cdev.owner = driver->owner;
+        error = cdev_add(&driver->cdev, dev, driver->num);
+        if (error) {
+                unregister_chrdev_region(dev, driver->num);
+                driver->ttys = NULL;
+                driver->termios = NULL;
+                kfree(p);
+                return error;
+        }
+
+        mutex_lock(&tty_mutex);
+        list_add(&driver->tty_drivers, &tty_drivers);
+        mutex_unlock(&tty_mutex);
+
+        if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) {
+                for (i = 0; i < driver->num; i++) {
+                        d = tty_register_device(driver, i, NULL);
+                        if (IS_ERR(d)) {
+                                error = PTR_ERR(d);
+                                goto err;
+                        }
+                }
+        }
+        proc_tty_register_driver(driver);
+        driver->flags |= TTY_DRIVER_INSTALLED;
+        return 0;
+
+err:
+        for (i--; i >= 0; i--)
+                tty_unregister_device(driver, i);
+
+        mutex_lock(&tty_mutex);
+        list_del(&driver->tty_drivers);
+        mutex_unlock(&tty_mutex);
+
+        unregister_chrdev_region(dev, driver->num);
+        driver->ttys = NULL;
+        driver->termios = NULL;
+        kfree(p);
+        return error;
+}
+
+EXPORT_SYMBOL(tty_register_driver);
+
+/*
+ * Called by a tty driver to unregister itself.
+ */
+int tty_unregister_driver(struct tty_driver *driver)
+{
+#if 0
+        /* FIXME */
+        if (driver->refcount)
+                return -EBUSY;
+#endif
+        unregister_chrdev_region(MKDEV(driver->major, driver->minor_start),
+                                driver->num);
+        mutex_lock(&tty_mutex);
+        list_del(&driver->tty_drivers);
+        mutex_unlock(&tty_mutex);
+        return 0;
+}
+
+EXPORT_SYMBOL(tty_unregister_driver);
+
+dev_t tty_devnum(struct tty_struct *tty)
+{
+        return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
+}
+EXPORT_SYMBOL(tty_devnum);
+
+void proc_clear_tty(struct task_struct *p)
+{
+        unsigned long flags;
+        struct tty_struct *tty;
+        spin_lock_irqsave(&p->sighand->siglock, flags);
+        tty = p->signal->tty;
+        p->signal->tty = NULL;
+        spin_unlock_irqrestore(&p->sighand->siglock, flags);
+        tty_kref_put(tty);
+}
+
+/* Called under the sighand lock */
+
+static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty)
+{
+        if (tty) {
+                unsigned long flags;
+                /* We should not have a session or pgrp to put here but.... */
+                spin_lock_irqsave(&tty->ctrl_lock, flags);
+                put_pid(tty->session);
+                put_pid(tty->pgrp);
+                tty->pgrp = get_pid(task_pgrp(tsk));
+                spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                tty->session = get_pid(task_session(tsk));
+                if (tsk->signal->tty) {
+                        printk(KERN_DEBUG "tty not NULL!!\n");
+                        tty_kref_put(tsk->signal->tty);
+                }
+        }
+        put_pid(tsk->signal->tty_old_pgrp);
+        tsk->signal->tty = tty_kref_get(tty);
+        tsk->signal->tty_old_pgrp = NULL;
+}
+
+static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty)
+{
+        spin_lock_irq(&tsk->sighand->siglock);
+        __proc_set_tty(tsk, tty);
+        spin_unlock_irq(&tsk->sighand->siglock);
+}
+
+struct tty_struct *get_current_tty(void)
+{
+        struct tty_struct *tty;
+        unsigned long flags;
+
+        spin_lock_irqsave(&current->sighand->siglock, flags);
+        tty = tty_kref_get(current->signal->tty);
+        spin_unlock_irqrestore(&current->sighand->siglock, flags);
+        return tty;
+}
+EXPORT_SYMBOL_GPL(get_current_tty);
+
+void tty_default_fops(struct file_operations *fops)
+{
+        *fops = tty_fops;
+}
+
+/*
+ * Initialize the console device. This is called *early*, so
+ * we can't necessarily depend on lots of kernel help here.
+ * Just do some early initializations, and do the complex setup
+ * later.
+ */
+void __init console_init(void)
+{
+        initcall_t *call;
+
+        /* Setup the default TTY line discipline. */
+        tty_ldisc_begin();
+
+        /*
+         * set up the console device so that later boot sequences can
+         * inform about problems etc..
+         */
+        call = __con_initcall_start;
+        while (call < __con_initcall_end) {
+                (*call)();
+                call++;
+        }
+}
+
+static char *tty_devnode(struct device *dev, mode_t *mode)
+{
+        if (!mode)
+                return NULL;
+        if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) ||
+            dev->devt == MKDEV(TTYAUX_MAJOR, 2))
+                *mode = 0666;
+        return NULL;
+}
+
+static int __init tty_class_init(void)
+{
+        tty_class = class_create(THIS_MODULE, "tty");
+        if (IS_ERR(tty_class))
+                return PTR_ERR(tty_class);
+        tty_class->devnode = tty_devnode;
+        return 0;
+}
+
+postcore_initcall(tty_class_init);
+
+/* 3/2004 jmc: why do these devices exist? */
+static struct cdev tty_cdev, console_cdev;
+
+static ssize_t show_cons_active(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        struct console *cs[16];
+        int i = 0;
+        struct console *c;
+        ssize_t count = 0;
+
+        console_lock();
+        for_each_console(c) {
+                if (!c->device)
+                        continue;
+                if (!c->write)
+                        continue;
+                if ((c->flags & CON_ENABLED) == 0)
+                        continue;
+                cs[i++] = c;
+                if (i >= ARRAY_SIZE(cs))
+                        break;
+        }
+        while (i--)
+                count += sprintf(buf + count, "%s%d%c",
+                                 cs[i]->name, cs[i]->index, i ? ' ':'\n');
+        console_unlock();
+
+        return count;
+}
+static DEVICE_ATTR(active, S_IRUGO, show_cons_active, NULL);
+
+static struct device *consdev;
+
+void console_sysfs_notify(void)
+{
+        if (consdev)
+                sysfs_notify(&consdev->kobj, NULL, "active");
+}
+
+/*
+ * Ok, now we can initialize the rest of the tty devices and can count
+ * on memory allocations, interrupts etc..
+ */
+int __init tty_init(void)
+{
+        cdev_init(&tty_cdev, &tty_fops);
+        if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) ||
+            register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0)
+                panic("Couldn't register /dev/tty driver\n");
+        device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL, "tty");
+
+        cdev_init(&console_cdev, &console_fops);
+        if (cdev_add(&console_cdev, MKDEV(TTYAUX_MAJOR, 1), 1) ||
+            register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0)
+                panic("Couldn't register /dev/console driver\n");
+        consdev = device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL,
+                              "console");
+        if (IS_ERR(consdev))
+                consdev = NULL;
+        else
+                WARN_ON(device_create_file(consdev, &dev_attr_active) < 0);
+
+#ifdef CONFIG_VT
+        vty_init(&console_fops);
+#endif
+        return 0;
+}
+
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
new file mode 100644
index 000000000000..53f2442c6099
--- /dev/null
+++ b/drivers/tty/tty_ioctl.c
@@ -0,0 +1,1181 @@
+/*
+ *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ *
+ * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
+ * which can be dynamically activated and de-activated by the line
+ * discipline handling modules (like SLIP).
+ */
+
+#include <linux/types.h>
+#include <linux/termios.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/tty.h>
+#include <linux/fcntl.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/mutex.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#undef TTY_DEBUG_WAIT_UNTIL_SENT
+
+#undef  DEBUG
+
+/*
+ * Internal flag options for termios setting behavior
+ */
+#define TERMIOS_FLUSH   1
+#define TERMIOS_WAIT    2
+#define TERMIOS_TERMIO  4
+#define TERMIOS_OLD     8
+
+
+/**
+ *      tty_chars_in_buffer     -       characters pending
+ *      @tty: terminal
+ *
+ *      Return the number of bytes of data in the device private
+ *      output queue. If no private method is supplied there is assumed
+ *      to be no queue on the device.
+ */
+
+int tty_chars_in_buffer(struct tty_struct *tty)
+{
+        if (tty->ops->chars_in_buffer)
+                return tty->ops->chars_in_buffer(tty);
+        else
+                return 0;
+}
+EXPORT_SYMBOL(tty_chars_in_buffer);
+
+/**
+ *      tty_write_room          -       write queue space
+ *      @tty: terminal
+ *
+ *      Return the number of bytes that can be queued to this device
+ *      at the present time. The result should be treated as a guarantee
+ *      and the driver cannot offer a value it later shrinks by more than
+ *      the number of bytes written. If no method is provided 2K is always
+ *      returned and data may be lost as there will be no flow control.
+ */
+ 
+int tty_write_room(struct tty_struct *tty)
+{
+        if (tty->ops->write_room)
+                return tty->ops->write_room(tty);
+        return 2048;
+}
+EXPORT_SYMBOL(tty_write_room);
+
+/**
+ *      tty_driver_flush_buffer -       discard internal buffer
+ *      @tty: terminal
+ *
+ *      Discard the internal output buffer for this device. If no method
+ *      is provided then either the buffer cannot be hardware flushed or
+ *      there is no buffer driver side.
+ */
+void tty_driver_flush_buffer(struct tty_struct *tty)
+{
+        if (tty->ops->flush_buffer)
+                tty->ops->flush_buffer(tty);
+}
+EXPORT_SYMBOL(tty_driver_flush_buffer);
+
+/**
+ *      tty_throttle            -       flow control
+ *      @tty: terminal
+ *
+ *      Indicate that a tty should stop transmitting data down the stack.
+ *      Takes the termios mutex to protect against parallel throttle/unthrottle
+ *      and also to ensure the driver can consistently reference its own
+ *      termios data at this point when implementing software flow control.
+ */
+
+void tty_throttle(struct tty_struct *tty)
+{
+        mutex_lock(&tty->termios_mutex);
+        /* check TTY_THROTTLED first so it indicates our state */
+        if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
+            tty->ops->throttle)
+                tty->ops->throttle(tty);
+        mutex_unlock(&tty->termios_mutex);
+}
+EXPORT_SYMBOL(tty_throttle);
+
+/**
+ *      tty_unthrottle          -       flow control
+ *      @tty: terminal
+ *
+ *      Indicate that a tty may continue transmitting data down the stack.
+ *      Takes the termios mutex to protect against parallel throttle/unthrottle
+ *      and also to ensure the driver can consistently reference its own
+ *      termios data at this point when implementing software flow control.
+ *
+ *      Drivers should however remember that the stack can issue a throttle,
+ *      then change flow control method, then unthrottle.
+ */
+
+void tty_unthrottle(struct tty_struct *tty)
+{
+        mutex_lock(&tty->termios_mutex);
+        if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
+            tty->ops->unthrottle)
+                tty->ops->unthrottle(tty);
+        mutex_unlock(&tty->termios_mutex);
+}
+EXPORT_SYMBOL(tty_unthrottle);
+
+/**
+ *      tty_wait_until_sent     -       wait for I/O to finish
+ *      @tty: tty we are waiting for
+ *      @timeout: how long we will wait
+ *
+ *      Wait for characters pending in a tty driver to hit the wire, or
+ *      for a timeout to occur (eg due to flow control)
+ *
+ *      Locking: none
+ */
+
+void tty_wait_until_sent(struct tty_struct *tty, long timeout)
+{
+#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
+        char buf[64];
+
+        printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf));
+#endif
+        if (!timeout)
+                timeout = MAX_SCHEDULE_TIMEOUT;
+        if (wait_event_interruptible_timeout(tty->write_wait,
+                        !tty_chars_in_buffer(tty), timeout) >= 0) {
+                if (tty->ops->wait_until_sent)
+                        tty->ops->wait_until_sent(tty, timeout);
+        }
+}
+EXPORT_SYMBOL(tty_wait_until_sent);
+
+
+/*
+ *              Termios Helper Methods
+ */
+
+static void unset_locked_termios(struct ktermios *termios,
+                                 struct ktermios *old,
+                                 struct ktermios *locked)
+{
+        int     i;
+
+#define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z)))
+
+        if (!locked) {
+                printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n");
+                return;
+        }
+
+        NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
+        NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
+        NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
+        NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
+        termios->c_line = locked->c_line ? old->c_line : termios->c_line;
+        for (i = 0; i < NCCS; i++)
+                termios->c_cc[i] = locked->c_cc[i] ?
+                        old->c_cc[i] : termios->c_cc[i];
+        /* FIXME: What should we do for i/ospeed */
+}
+
+/*
+ * Routine which returns the baud rate of the tty
+ *
+ * Note that the baud_table needs to be kept in sync with the
+ * include/asm/termbits.h file.
+ */
+static const speed_t baud_table[] = {
+        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+        9600, 19200, 38400, 57600, 115200, 230400, 460800,
+#ifdef __sparc__
+        76800, 153600, 307200, 614400, 921600
+#else
+        500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,
+        2500000, 3000000, 3500000, 4000000
+#endif
+};
+
+#ifndef __sparc__
+static const tcflag_t baud_bits[] = {
+        B0, B50, B75, B110, B134, B150, B200, B300, B600,
+        B1200, B1800, B2400, B4800, B9600, B19200, B38400,
+        B57600, B115200, B230400, B460800, B500000, B576000,
+        B921600, B1000000, B1152000, B1500000, B2000000, B2500000,
+        B3000000, B3500000, B4000000
+};
+#else
+static const tcflag_t baud_bits[] = {
+        B0, B50, B75, B110, B134, B150, B200, B300, B600,
+        B1200, B1800, B2400, B4800, B9600, B19200, B38400,
+        B57600, B115200, B230400, B460800, B76800, B153600,
+        B307200, B614400, B921600
+};
+#endif
+
+static int n_baud_table = ARRAY_SIZE(baud_table);
+
+/**
+ *      tty_termios_baud_rate
+ *      @termios: termios structure
+ *
+ *      Convert termios baud rate data into a speed. This should be called
+ *      with the termios lock held if this termios is a terminal termios
+ *      structure. May change the termios data. Device drivers can call this
+ *      function but should use ->c_[io]speed directly as they are updated.
+ *
+ *      Locking: none
+ */
+
+speed_t tty_termios_baud_rate(struct ktermios *termios)
+{
+        unsigned int cbaud;
+
+        cbaud = termios->c_cflag & CBAUD;
+
+#ifdef BOTHER
+        /* Magic token for arbitrary speed via c_ispeed/c_ospeed */
+        if (cbaud == BOTHER)
+                return termios->c_ospeed;
+#endif
+        if (cbaud & CBAUDEX) {
+                cbaud &= ~CBAUDEX;
+
+                if (cbaud < 1 || cbaud + 15 > n_baud_table)
+                        termios->c_cflag &= ~CBAUDEX;
+                else
+                        cbaud += 15;
+        }
+        return baud_table[cbaud];
+}
+EXPORT_SYMBOL(tty_termios_baud_rate);
+
+/**
+ *      tty_termios_input_baud_rate
+ *      @termios: termios structure
+ *
+ *      Convert termios baud rate data into a speed. This should be called
+ *      with the termios lock held if this termios is a terminal termios
+ *      structure. May change the termios data. Device drivers can call this
+ *      function but should use ->c_[io]speed directly as they are updated.
+ *
+ *      Locking: none
+ */
+
+speed_t tty_termios_input_baud_rate(struct ktermios *termios)
+{
+#ifdef IBSHIFT
+        unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
+
+        if (cbaud == B0)
+                return tty_termios_baud_rate(termios);
+
+        /* Magic token for arbitrary speed via c_ispeed*/
+        if (cbaud == BOTHER)
+                return termios->c_ispeed;
+
+        if (cbaud & CBAUDEX) {
+                cbaud &= ~CBAUDEX;
+
+                if (cbaud < 1 || cbaud + 15 > n_baud_table)
+                        termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
+                else
+                        cbaud += 15;
+        }
+        return baud_table[cbaud];
+#else
+        return tty_termios_baud_rate(termios);
+#endif
+}
+EXPORT_SYMBOL(tty_termios_input_baud_rate);
+
+/**
+ *      tty_termios_encode_baud_rate
+ *      @termios: ktermios structure holding user requested state
+ *      @ispeed: input speed
+ *      @ospeed: output speed
+ *
+ *      Encode the speeds set into the passed termios structure. This is
+ *      used as a library helper for drivers so that they can report back
+ *      the actual speed selected when it differs from the speed requested
+ *
+ *      For maximal back compatibility with legacy SYS5/POSIX *nix behaviour
+ *      we need to carefully set the bits when the user does not get the
+ *      desired speed. We allow small margins and preserve as much of possible
+ *      of the input intent to keep compatibility.
+ *
+ *      Locking: Caller should hold termios lock. This is already held
+ *      when calling this function from the driver termios handler.
+ *
+ *      The ifdefs deal with platforms whose owners have yet to update them
+ *      and will all go away once this is done.
+ */
+
+void tty_termios_encode_baud_rate(struct ktermios *termios,
+                                  speed_t ibaud, speed_t obaud)
+{
+        int i = 0;
+        int ifound = -1, ofound = -1;
+        int iclose = ibaud/50, oclose = obaud/50;
+        int ibinput = 0;
+
+        if (obaud == 0)                 /* CD dropped             */
+                ibaud = 0;              /* Clear ibaud to be sure */
+
+        termios->c_ispeed = ibaud;
+        termios->c_ospeed = obaud;
+
+#ifdef BOTHER
+        /* If the user asked for a precise weird speed give a precise weird
+           answer. If they asked for a Bfoo speed they many have problems
+           digesting non-exact replies so fuzz a bit */
+
+        if ((termios->c_cflag & CBAUD) == BOTHER)
+                oclose = 0;
+        if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)
+                iclose = 0;
+        if ((termios->c_cflag >> IBSHIFT) & CBAUD)
+                ibinput = 1;    /* An input speed was specified */
+#endif
+        termios->c_cflag &= ~CBAUD;
+
+        /*
+         *      Our goal is to find a close match to the standard baud rate
+         *      returned. Walk the baud rate table and if we get a very close
+         *      match then report back the speed as a POSIX Bxxxx value by
+         *      preference
+         */
+
+        do {
+                if (obaud - oclose <= baud_table[i] &&
+                    obaud + oclose >= baud_table[i]) {
+                        termios->c_cflag |= baud_bits[i];
+                        ofound = i;
+                }
+                if (ibaud - iclose <= baud_table[i] &&
+                    ibaud + iclose >= baud_table[i]) {
+                        /* For the case input == output don't set IBAUD bits
+                           if the user didn't do so */
+                        if (ofound == i && !ibinput)
+                                ifound  = i;
+#ifdef IBSHIFT
+                        else {
+                                ifound = i;
+                                termios->c_cflag |= (baud_bits[i] << IBSHIFT);
+                        }
+#endif
+                }
+        } while (++i < n_baud_table);
+
+        /*
+         *      If we found no match then use BOTHER if provided or warn
+         *      the user their platform maintainer needs to wake up if not.
+         */
+#ifdef BOTHER
+        if (ofound == -1)
+                termios->c_cflag |= BOTHER;
+        /* Set exact input bits only if the input and output differ or the
+           user already did */
+        if (ifound == -1 && (ibaud != obaud || ibinput))
+                termios->c_cflag |= (BOTHER << IBSHIFT);
+#else
+        if (ifound == -1 || ofound == -1) {
+                printk_once(KERN_WARNING "tty: Unable to return correct "
+                          "speed data as your architecture needs updating.\n");
+        }
+#endif
+}
+EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
+
+/**
+ *      tty_encode_baud_rate            -       set baud rate of the tty
+ *      @ibaud: input baud rate
+ *      @obad: output baud rate
+ *
+ *      Update the current termios data for the tty with the new speed
+ *      settings. The caller must hold the termios_mutex for the tty in
+ *      question.
+ */
+
+void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)
+{
+        tty_termios_encode_baud_rate(tty->termios, ibaud, obaud);
+}
+EXPORT_SYMBOL_GPL(tty_encode_baud_rate);
+
+/**
+ *      tty_get_baud_rate       -       get tty bit rates
+ *      @tty: tty to query
+ *
+ *      Returns the baud rate as an integer for this terminal. The
+ *      termios lock must be held by the caller and the terminal bit
+ *      flags may be updated.
+ *
+ *      Locking: none
+ */
+
+speed_t tty_get_baud_rate(struct tty_struct *tty)
+{
+        speed_t baud = tty_termios_baud_rate(tty->termios);
+
+        if (baud == 38400 && tty->alt_speed) {
+                if (!tty->warned) {
+                        printk(KERN_WARNING "Use of setserial/setrocket to "
+                                            "set SPD_* flags is deprecated\n");
+                        tty->warned = 1;
+                }
+                baud = tty->alt_speed;
+        }
+
+        return baud;
+}
+EXPORT_SYMBOL(tty_get_baud_rate);
+
+/**
+ *      tty_termios_copy_hw     -       copy hardware settings
+ *      @new: New termios
+ *      @old: Old termios
+ *
+ *      Propagate the hardware specific terminal setting bits from
+ *      the old termios structure to the new one. This is used in cases
+ *      where the hardware does not support reconfiguration or as a helper
+ *      in some cases where only minimal reconfiguration is supported
+ */
+
+void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old)
+{
+        /* The bits a dumb device handles in software. Smart devices need
+           to always provide a set_termios method */
+        new->c_cflag &= HUPCL | CREAD | CLOCAL;
+        new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL);
+        new->c_ispeed = old->c_ispeed;
+        new->c_ospeed = old->c_ospeed;
+}
+EXPORT_SYMBOL(tty_termios_copy_hw);
+
+/**
+ *      tty_termios_hw_change   -       check for setting change
+ *      @a: termios
+ *      @b: termios to compare
+ *
+ *      Check if any of the bits that affect a dumb device have changed
+ *      between the two termios structures, or a speed change is needed.
+ */
+
+int tty_termios_hw_change(struct ktermios *a, struct ktermios *b)
+{
+        if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
+                return 1;
+        if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL))
+                return 1;
+        return 0;
+}
+EXPORT_SYMBOL(tty_termios_hw_change);
+
+/**
+ *      tty_set_termios         -       update termios values
+ *      @tty: tty to update
+ *      @new_termios: desired new value
+ *
+ *      Perform updates to the termios values set on this terminal. There
+ *      is a bit of layering violation here with n_tty in terms of the
+ *      internal knowledge of this function.
+ *
+ *      Locking: termios_mutex
+ */
+
+int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
+{
+        struct ktermios old_termios;
+        struct tty_ldisc *ld;
+        unsigned long flags;
+
+        /*
+         *      Perform the actual termios internal changes under lock.
+         */
+
+
+        /* FIXME: we need to decide on some locking/ordering semantics
+           for the set_termios notification eventually */
+        mutex_lock(&tty->termios_mutex);
+        old_termios = *tty->termios;
+        *tty->termios = *new_termios;
+        unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
+
+        /* See if packet mode change of state. */
+        if (tty->link && tty->link->packet) {
+                int extproc = (old_termios.c_lflag & EXTPROC) |
+                                (tty->termios->c_lflag & EXTPROC);
+                int old_flow = ((old_termios.c_iflag & IXON) &&
+                                (old_termios.c_cc[VSTOP] == '\023') &&
+                                (old_termios.c_cc[VSTART] == '\021'));
+                int new_flow = (I_IXON(tty) &&
+                                STOP_CHAR(tty) == '\023' &&
+                                START_CHAR(tty) == '\021');
+                if ((old_flow != new_flow) || extproc) {
+                        spin_lock_irqsave(&tty->ctrl_lock, flags);
+                        if (old_flow != new_flow) {
+                                tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
+                                if (new_flow)
+                                        tty->ctrl_status |= TIOCPKT_DOSTOP;
+                                else
+                                        tty->ctrl_status |= TIOCPKT_NOSTOP;
+                        }
+                        if (extproc)
+                                tty->ctrl_status |= TIOCPKT_IOCTL;
+                        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                        wake_up_interruptible(&tty->link->read_wait);
+                }
+        }
+
+        if (tty->ops->set_termios)
+                (*tty->ops->set_termios)(tty, &old_termios);
+        else
+                tty_termios_copy_hw(tty->termios, &old_termios);
+
+        ld = tty_ldisc_ref(tty);
+        if (ld != NULL) {
+                if (ld->ops->set_termios)
+                        (ld->ops->set_termios)(tty, &old_termios);
+                tty_ldisc_deref(ld);
+        }
+        mutex_unlock(&tty->termios_mutex);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(tty_set_termios);
+
+/**
+ *      set_termios             -       set termios values for a tty
+ *      @tty: terminal device
+ *      @arg: user data
+ *      @opt: option information
+ *
+ *      Helper function to prepare termios data and run necessary other
+ *      functions before using tty_set_termios to do the actual changes.
+ *
+ *      Locking:
+ *              Called functions take ldisc and termios_mutex locks
+ */
+
+static int set_termios(struct tty_struct *tty, void __user *arg, int opt)
+{
+        struct ktermios tmp_termios;
+        struct tty_ldisc *ld;
+        int retval = tty_check_change(tty);
+
+        if (retval)
+                return retval;
+
+        mutex_lock(&tty->termios_mutex);
+        memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios));
+        mutex_unlock(&tty->termios_mutex);
+
+        if (opt & TERMIOS_TERMIO) {
+                if (user_termio_to_kernel_termios(&tmp_termios,
+                                                (struct termio __user *)arg))
+                        return -EFAULT;
+#ifdef TCGETS2
+        } else if (opt & TERMIOS_OLD) {
+                if (user_termios_to_kernel_termios_1(&tmp_termios,
+                                                (struct termios __user *)arg))
+                        return -EFAULT;
+        } else {
+                if (user_termios_to_kernel_termios(&tmp_termios,
+                                                (struct termios2 __user *)arg))
+                        return -EFAULT;
+        }
+#else
+        } else if (user_termios_to_kernel_termios(&tmp_termios,
+                                        (struct termios __user *)arg))
+                return -EFAULT;
+#endif
+
+        /* If old style Bfoo values are used then load c_ispeed/c_ospeed
+         * with the real speed so its unconditionally usable */
+        tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios);
+        tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios);
+
+        ld = tty_ldisc_ref(tty);
+
+        if (ld != NULL) {
+                if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
+                        ld->ops->flush_buffer(tty);
+                tty_ldisc_deref(ld);
+        }
+
+        if (opt & TERMIOS_WAIT) {
+                tty_wait_until_sent(tty, 0);
+                if (signal_pending(current))
+                        return -EINTR;
+        }
+
+        tty_set_termios(tty, &tmp_termios);
+
+        /* FIXME: Arguably if tmp_termios == tty->termios AND the
+           actual requested termios was not tmp_termios then we may
+           want to return an error as no user requested change has
+           succeeded */
+        return 0;
+}
+
+static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)
+{
+        mutex_lock(&tty->termios_mutex);
+        memcpy(kterm, tty->termios, sizeof(struct ktermios));
+        mutex_unlock(&tty->termios_mutex);
+}
+
+static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)
+{
+        mutex_lock(&tty->termios_mutex);
+        memcpy(kterm, tty->termios_locked, sizeof(struct ktermios));
+        mutex_unlock(&tty->termios_mutex);
+}
+
+static int get_termio(struct tty_struct *tty, struct termio __user *termio)
+{
+        struct ktermios kterm;
+        copy_termios(tty, &kterm);
+        if (kernel_termios_to_user_termio(termio, &kterm))
+                return -EFAULT;
+        return 0;
+}
+
+
+#ifdef TCGETX
+
+/**
+ *      set_termiox     -       set termiox fields if possible
+ *      @tty: terminal
+ *      @arg: termiox structure from user
+ *      @opt: option flags for ioctl type
+ *
+ *      Implement the device calling points for the SYS5 termiox ioctl
+ *      interface in Linux
+ */
+
+static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)
+{
+        struct termiox tnew;
+        struct tty_ldisc *ld;
+
+        if (tty->termiox == NULL)
+                return -EINVAL;
+        if (copy_from_user(&tnew, arg, sizeof(struct termiox)))
+                return -EFAULT;
+
+        ld = tty_ldisc_ref(tty);
+        if (ld != NULL) {
+                if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
+                        ld->ops->flush_buffer(tty);
+                tty_ldisc_deref(ld);
+        }
+        if (opt & TERMIOS_WAIT) {
+                tty_wait_until_sent(tty, 0);
+                if (signal_pending(current))
+                        return -EINTR;
+        }
+
+        mutex_lock(&tty->termios_mutex);
+        if (tty->ops->set_termiox)
+                tty->ops->set_termiox(tty, &tnew);
+        mutex_unlock(&tty->termios_mutex);
+        return 0;
+}
+
+#endif
+
+
+#ifdef TIOCGETP
+/*
+ * These are deprecated, but there is limited support..
+ *
+ * The "sg_flags" translation is a joke..
+ */
+static int get_sgflags(struct tty_struct *tty)
+{
+        int flags = 0;
+
+        if (!(tty->termios->c_lflag & ICANON)) {
+                if (tty->termios->c_lflag & ISIG)
+                        flags |= 0x02;          /* cbreak */
+                else
+                        flags |= 0x20;          /* raw */
+        }
+        if (tty->termios->c_lflag & ECHO)
+                flags |= 0x08;                  /* echo */
+        if (tty->termios->c_oflag & OPOST)
+                if (tty->termios->c_oflag & ONLCR)
+                        flags |= 0x10;          /* crmod */
+        return flags;
+}
+
+static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
+{
+        struct sgttyb tmp;
+
+        mutex_lock(&tty->termios_mutex);
+        tmp.sg_ispeed = tty->termios->c_ispeed;
+        tmp.sg_ospeed = tty->termios->c_ospeed;
+        tmp.sg_erase = tty->termios->c_cc[VERASE];
+        tmp.sg_kill = tty->termios->c_cc[VKILL];
+        tmp.sg_flags = get_sgflags(tty);
+        mutex_unlock(&tty->termios_mutex);
+
+        return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+static void set_sgflags(struct ktermios *termios, int flags)
+{
+        termios->c_iflag = ICRNL | IXON;
+        termios->c_oflag = 0;
+        termios->c_lflag = ISIG | ICANON;
+        if (flags & 0x02) {     /* cbreak */
+                termios->c_iflag = 0;
+                termios->c_lflag &= ~ICANON;
+        }
+        if (flags & 0x08) {             /* echo */
+                termios->c_lflag |= ECHO | ECHOE | ECHOK |
+                                    ECHOCTL | ECHOKE | IEXTEN;
+        }
+        if (flags & 0x10) {             /* crmod */
+                termios->c_oflag |= OPOST | ONLCR;
+        }
+        if (flags & 0x20) {     /* raw */
+                termios->c_iflag = 0;
+                termios->c_lflag &= ~(ISIG | ICANON);
+        }
+        if (!(termios->c_lflag & ICANON)) {
+                termios->c_cc[VMIN] = 1;
+                termios->c_cc[VTIME] = 0;
+        }
+}
+
+/**
+ *      set_sgttyb              -       set legacy terminal values
+ *      @tty: tty structure
+ *      @sgttyb: pointer to old style terminal structure
+ *
+ *      Updates a terminal from the legacy BSD style terminal information
+ *      structure.
+ *
+ *      Locking: termios_mutex
+ */
+
+static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
+{
+        int retval;
+        struct sgttyb tmp;
+        struct ktermios termios;
+
+        retval = tty_check_change(tty);
+        if (retval)
+                return retval;
+
+        if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
+                return -EFAULT;
+
+        mutex_lock(&tty->termios_mutex);
+        termios = *tty->termios;
+        termios.c_cc[VERASE] = tmp.sg_erase;
+        termios.c_cc[VKILL] = tmp.sg_kill;
+        set_sgflags(&termios, tmp.sg_flags);
+        /* Try and encode into Bfoo format */
+#ifdef BOTHER
+        tty_termios_encode_baud_rate(&termios, termios.c_ispeed,
+                                                termios.c_ospeed);
+#endif
+        mutex_unlock(&tty->termios_mutex);
+        tty_set_termios(tty, &termios);
+        return 0;
+}
+#endif
+
+#ifdef TIOCGETC
+static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)
+{
+        struct tchars tmp;
+
+        mutex_lock(&tty->termios_mutex);
+        tmp.t_intrc = tty->termios->c_cc[VINTR];
+        tmp.t_quitc = tty->termios->c_cc[VQUIT];
+        tmp.t_startc = tty->termios->c_cc[VSTART];
+        tmp.t_stopc = tty->termios->c_cc[VSTOP];
+        tmp.t_eofc = tty->termios->c_cc[VEOF];
+        tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */
+        mutex_unlock(&tty->termios_mutex);
+        return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)
+{
+        struct tchars tmp;
+
+        if (copy_from_user(&tmp, tchars, sizeof(tmp)))
+                return -EFAULT;
+        mutex_lock(&tty->termios_mutex);
+        tty->termios->c_cc[VINTR] = tmp.t_intrc;
+        tty->termios->c_cc[VQUIT] = tmp.t_quitc;
+        tty->termios->c_cc[VSTART] = tmp.t_startc;
+        tty->termios->c_cc[VSTOP] = tmp.t_stopc;
+        tty->termios->c_cc[VEOF] = tmp.t_eofc;
+        tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */
+        mutex_unlock(&tty->termios_mutex);
+        return 0;
+}
+#endif
+
+#ifdef TIOCGLTC
+static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
+{
+        struct ltchars tmp;
+
+        mutex_lock(&tty->termios_mutex);
+        tmp.t_suspc = tty->termios->c_cc[VSUSP];
+        /* what is dsuspc anyway? */
+        tmp.t_dsuspc = tty->termios->c_cc[VSUSP];
+        tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
+        /* what is flushc anyway? */
+        tmp.t_flushc = tty->termios->c_cc[VEOL2];
+        tmp.t_werasc = tty->termios->c_cc[VWERASE];
+        tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
+        mutex_unlock(&tty->termios_mutex);
+        return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
+}
+
+static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
+{
+        struct ltchars tmp;
+
+        if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
+                return -EFAULT;
+
+        mutex_lock(&tty->termios_mutex);
+        tty->termios->c_cc[VSUSP] = tmp.t_suspc;
+        /* what is dsuspc anyway? */
+        tty->termios->c_cc[VEOL2] = tmp.t_dsuspc;
+        tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
+        /* what is flushc anyway? */
+        tty->termios->c_cc[VEOL2] = tmp.t_flushc;
+        tty->termios->c_cc[VWERASE] = tmp.t_werasc;
+        tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
+        mutex_unlock(&tty->termios_mutex);
+        return 0;
+}
+#endif
+
+/**
+ *      send_prio_char          -       send priority character
+ *
+ *      Send a high priority character to the tty even if stopped
+ *
+ *      Locking: none for xchar method, write ordering for write method.
+ */
+
+static int send_prio_char(struct tty_struct *tty, char ch)
+{
+        int     was_stopped = tty->stopped;
+
+        if (tty->ops->send_xchar) {
+                tty->ops->send_xchar(tty, ch);
+                return 0;
+        }
+
+        if (tty_write_lock(tty, 0) < 0)
+                return -ERESTARTSYS;
+
+        if (was_stopped)
+                start_tty(tty);
+        tty->ops->write(tty, &ch, 1);
+        if (was_stopped)
+                stop_tty(tty);
+        tty_write_unlock(tty);
+        return 0;
+}
+
+/**
+ *      tty_change_softcar      -       carrier change ioctl helper
+ *      @tty: tty to update
+ *      @arg: enable/disable CLOCAL
+ *
+ *      Perform a change to the CLOCAL state and call into the driver
+ *      layer to make it visible. All done with the termios mutex
+ */
+
+static int tty_change_softcar(struct tty_struct *tty, int arg)
+{
+        int ret = 0;
+        int bit = arg ? CLOCAL : 0;
+        struct ktermios old;
+
+        mutex_lock(&tty->termios_mutex);
+        old = *tty->termios;
+        tty->termios->c_cflag &= ~CLOCAL;
+        tty->termios->c_cflag |= bit;
+        if (tty->ops->set_termios)
+                tty->ops->set_termios(tty, &old);
+        if ((tty->termios->c_cflag & CLOCAL) != bit)
+                ret = -EINVAL;
+        mutex_unlock(&tty->termios_mutex);
+        return ret;
+}
+
+/**
+ *      tty_mode_ioctl          -       mode related ioctls
+ *      @tty: tty for the ioctl
+ *      @file: file pointer for the tty
+ *      @cmd: command
+ *      @arg: ioctl argument
+ *
+ *      Perform non line discipline specific mode control ioctls. This
+ *      is designed to be called by line disciplines to ensure they provide
+ *      consistent mode setting.
+ */
+
+int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
+                        unsigned int cmd, unsigned long arg)
+{
+        struct tty_struct *real_tty;
+        void __user *p = (void __user *)arg;
+        int ret = 0;
+        struct ktermios kterm;
+
+        BUG_ON(file == NULL);
+
+        if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+            tty->driver->subtype == PTY_TYPE_MASTER)
+                real_tty = tty->link;
+        else
+                real_tty = tty;
+
+        switch (cmd) {
+#ifdef TIOCGETP
+        case TIOCGETP:
+                return get_sgttyb(real_tty, (struct sgttyb __user *) arg);
+        case TIOCSETP:
+        case TIOCSETN:
+                return set_sgttyb(real_tty, (struct sgttyb __user *) arg);
+#endif
+#ifdef TIOCGETC
+        case TIOCGETC:
+                return get_tchars(real_tty, p);
+        case TIOCSETC:
+                return set_tchars(real_tty, p);
+#endif
+#ifdef TIOCGLTC
+        case TIOCGLTC:
+                return get_ltchars(real_tty, p);
+        case TIOCSLTC:
+                return set_ltchars(real_tty, p);
+#endif
+        case TCSETSF:
+                return set_termios(real_tty, p,  TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD);
+        case TCSETSW:
+                return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD);
+        case TCSETS:
+                return set_termios(real_tty, p, TERMIOS_OLD);
+#ifndef TCGETS2
+        case TCGETS:
+                copy_termios(real_tty, &kterm);
+                if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm))
+                        ret = -EFAULT;
+                return ret;
+#else
+        case TCGETS:
+                copy_termios(real_tty, &kterm);
+                if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm))
+                        ret = -EFAULT;
+                return ret;
+        case TCGETS2:
+                copy_termios(real_tty, &kterm);
+                if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm))
+                        ret = -EFAULT;
+                return ret;
+        case TCSETSF2:
+                return set_termios(real_tty, p,  TERMIOS_FLUSH | TERMIOS_WAIT);
+        case TCSETSW2:
+                return set_termios(real_tty, p, TERMIOS_WAIT);
+        case TCSETS2:
+                return set_termios(real_tty, p, 0);
+#endif
+        case TCGETA:
+                return get_termio(real_tty, p);
+        case TCSETAF:
+                return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO);
+        case TCSETAW:
+                return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
+        case TCSETA:
+                return set_termios(real_tty, p, TERMIOS_TERMIO);
+#ifndef TCGETS2
+        case TIOCGLCKTRMIOS:
+                copy_termios_locked(real_tty, &kterm);
+                if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm))
+                        ret = -EFAULT;
+                return ret;
+        case TIOCSLCKTRMIOS:
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EPERM;
+                copy_termios_locked(real_tty, &kterm);
+                if (user_termios_to_kernel_termios(&kterm,
+                                               (struct termios __user *) arg))
+                        return -EFAULT;
+                mutex_lock(&real_tty->termios_mutex);
+                memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios));
+                mutex_unlock(&real_tty->termios_mutex);
+                return 0;
+#else
+        case TIOCGLCKTRMIOS:
+                copy_termios_locked(real_tty, &kterm);
+                if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm))
+                        ret = -EFAULT;
+                return ret;
+        case TIOCSLCKTRMIOS:
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EPERM;
+                copy_termios_locked(real_tty, &kterm);
+                if (user_termios_to_kernel_termios_1(&kterm,
+                                               (struct termios __user *) arg))
+                        return -EFAULT;
+                mutex_lock(&real_tty->termios_mutex);
+                memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios));
+                mutex_unlock(&real_tty->termios_mutex);
+                return ret;
+#endif
+#ifdef TCGETX
+        case TCGETX: {
+                struct termiox ktermx;
+                if (real_tty->termiox == NULL)
+                        return -EINVAL;
+                mutex_lock(&real_tty->termios_mutex);
+                memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox));
+                mutex_unlock(&real_tty->termios_mutex);
+                if (copy_to_user(p, &ktermx, sizeof(struct termiox)))
+                        ret = -EFAULT;
+                return ret;
+        }
+        case TCSETX:
+                return set_termiox(real_tty, p, 0);
+        case TCSETXW:
+                return set_termiox(real_tty, p, TERMIOS_WAIT);
+        case TCSETXF:
+                return set_termiox(real_tty, p, TERMIOS_FLUSH);
+#endif          
+        case TIOCGSOFTCAR:
+                copy_termios(real_tty, &kterm);
+                ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0,
+                                                (int __user *)arg);
+                return ret;
+        case TIOCSSOFTCAR:
+                if (get_user(arg, (unsigned int __user *) arg))
+                        return -EFAULT;
+                return tty_change_softcar(real_tty, arg);
+        default:
+                return -ENOIOCTLCMD;
+        }
+}
+EXPORT_SYMBOL_GPL(tty_mode_ioctl);
+
+int tty_perform_flush(struct tty_struct *tty, unsigned long arg)
+{
+        struct tty_ldisc *ld;
+        int retval = tty_check_change(tty);
+        if (retval)
+                return retval;
+
+        ld = tty_ldisc_ref_wait(tty);
+        switch (arg) {
+        case TCIFLUSH:
+                if (ld && ld->ops->flush_buffer)
+                        ld->ops->flush_buffer(tty);
+                break;
+        case TCIOFLUSH:
+                if (ld && ld->ops->flush_buffer)
+                        ld->ops->flush_buffer(tty);
+                /* fall through */
+        case TCOFLUSH:
+                tty_driver_flush_buffer(tty);
+                break;
+        default:
+                tty_ldisc_deref(ld);
+                return -EINVAL;
+        }
+        tty_ldisc_deref(ld);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(tty_perform_flush);
+
+int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
+                       unsigned int cmd, unsigned long arg)
+{
+        unsigned long flags;
+        int retval;
+
+        switch (cmd) {
+        case TCXONC:
+                retval = tty_check_change(tty);
+                if (retval)
+                        return retval;
+                switch (arg) {
+                case TCOOFF:
+                        if (!tty->flow_stopped) {
+                                tty->flow_stopped = 1;
+                                stop_tty(tty);
+                        }
+                        break;
+                case TCOON:
+                        if (tty->flow_stopped) {
+                                tty->flow_stopped = 0;
+                                start_tty(tty);
+                        }
+                        break;
+                case TCIOFF:
+                        if (STOP_CHAR(tty) != __DISABLED_CHAR)
+                                return send_prio_char(tty, STOP_CHAR(tty));
+                        break;
+                case TCION:
+                        if (START_CHAR(tty) != __DISABLED_CHAR)
+                                return send_prio_char(tty, START_CHAR(tty));
+                        break;
+                default:
+                        return -EINVAL;
+                }
+                return 0;
+        case TCFLSH:
+                return tty_perform_flush(tty, arg);
+        case TIOCPKT:
+        {
+                int pktmode;
+
+                if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
+                    tty->driver->subtype != PTY_TYPE_MASTER)
+                        return -ENOTTY;
+                if (get_user(pktmode, (int __user *) arg))
+                        return -EFAULT;
+                spin_lock_irqsave(&tty->ctrl_lock, flags);
+                if (pktmode) {
+                        if (!tty->packet) {
+                                tty->packet = 1;
+                                tty->link->ctrl_status = 0;
+                        }
+                } else
+                        tty->packet = 0;
+                spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+                return 0;
+        }
+        default:
+                /* Try the mode commands */
+                return tty_mode_ioctl(tty, file, cmd, arg);
+        }
+}
+EXPORT_SYMBOL(n_tty_ioctl_helper);
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
new file mode 100644
index 000000000000..ef925d581713
--- /dev/null
+++ b/drivers/tty/tty_ldisc.c
@@ -0,0 +1,978 @@
+#include <linux/types.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/fcntl.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/devpts_fs.h>
+#include <linux/file.h>
+#include <linux/console.h>
+#include <linux/timer.h>
+#include <linux/ctype.h>
+#include <linux/kd.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/seq_file.h>
+
+#include <linux/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/kbd_kern.h>
+#include <linux/vt_kern.h>
+#include <linux/selection.h>
+
+#include <linux/kmod.h>
+#include <linux/nsproxy.h>
+
+/*
+ *      This guards the refcounted line discipline lists. The lock
+ *      must be taken with irqs off because there are hangup path
+ *      callers who will do ldisc lookups and cannot sleep.
+ */
+
+static DEFINE_SPINLOCK(tty_ldisc_lock);
+static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_wait);
+static DECLARE_WAIT_QUEUE_HEAD(tty_ldisc_idle);
+/* Line disc dispatch table */
+static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
+
+static inline struct tty_ldisc *get_ldisc(struct tty_ldisc *ld)
+{
+        if (ld)
+                atomic_inc(&ld->users);
+        return ld;
+}
+
+static void put_ldisc(struct tty_ldisc *ld)
+{
+        unsigned long flags;
+
+        if (WARN_ON_ONCE(!ld))
+                return;
+
+        /*
+         * If this is the last user, free the ldisc, and
+         * release the ldisc ops.
+         *
+         * We really want an "atomic_dec_and_lock_irqsave()",
+         * but we don't have it, so this does it by hand.
+         */
+        local_irq_save(flags);
+        if (atomic_dec_and_lock(&ld->users, &tty_ldisc_lock)) {
+                struct tty_ldisc_ops *ldo = ld->ops;
+
+                ldo->refcount--;
+                module_put(ldo->owner);
+                spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+
+                kfree(ld);
+                return;
+        }
+        local_irq_restore(flags);
+        wake_up(&tty_ldisc_idle);
+}
+
+/**
+ *      tty_register_ldisc      -       install a line discipline
+ *      @disc: ldisc number
+ *      @new_ldisc: pointer to the ldisc object
+ *
+ *      Installs a new line discipline into the kernel. The discipline
+ *      is set up as unreferenced and then made available to the kernel
+ *      from this point onwards.
+ *
+ *      Locking:
+ *              takes tty_ldisc_lock to guard against ldisc races
+ */
+
+int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        if (disc < N_TTY || disc >= NR_LDISCS)
+                return -EINVAL;
+
+        spin_lock_irqsave(&tty_ldisc_lock, flags);
+        tty_ldiscs[disc] = new_ldisc;
+        new_ldisc->num = disc;
+        new_ldisc->refcount = 0;
+        spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL(tty_register_ldisc);
+
+/**
+ *      tty_unregister_ldisc    -       unload a line discipline
+ *      @disc: ldisc number
+ *      @new_ldisc: pointer to the ldisc object
+ *
+ *      Remove a line discipline from the kernel providing it is not
+ *      currently in use.
+ *
+ *      Locking:
+ *              takes tty_ldisc_lock to guard against ldisc races
+ */
+
+int tty_unregister_ldisc(int disc)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        if (disc < N_TTY || disc >= NR_LDISCS)
+                return -EINVAL;
+
+        spin_lock_irqsave(&tty_ldisc_lock, flags);
+        if (tty_ldiscs[disc]->refcount)
+                ret = -EBUSY;
+        else
+                tty_ldiscs[disc] = NULL;
+        spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL(tty_unregister_ldisc);
+
+static struct tty_ldisc_ops *get_ldops(int disc)
+{
+        unsigned long flags;
+        struct tty_ldisc_ops *ldops, *ret;
+
+        spin_lock_irqsave(&tty_ldisc_lock, flags);
+        ret = ERR_PTR(-EINVAL);
+        ldops = tty_ldiscs[disc];
+        if (ldops) {
+                ret = ERR_PTR(-EAGAIN);
+                if (try_module_get(ldops->owner)) {
+                        ldops->refcount++;
+                        ret = ldops;
+                }
+        }
+        spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+        return ret;
+}
+
+static void put_ldops(struct tty_ldisc_ops *ldops)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&tty_ldisc_lock, flags);
+        ldops->refcount--;
+        module_put(ldops->owner);
+        spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+}
+
+/**
+ *      tty_ldisc_get           -       take a reference to an ldisc
+ *      @disc: ldisc number
+ *
+ *      Takes a reference to a line discipline. Deals with refcounts and
+ *      module locking counts. Returns NULL if the discipline is not available.
+ *      Returns a pointer to the discipline and bumps the ref count if it is
+ *      available
+ *
+ *      Locking:
+ *              takes tty_ldisc_lock to guard against ldisc races
+ */
+
+static struct tty_ldisc *tty_ldisc_get(int disc)
+{
+        struct tty_ldisc *ld;
+        struct tty_ldisc_ops *ldops;
+
+        if (disc < N_TTY || disc >= NR_LDISCS)
+                return ERR_PTR(-EINVAL);
+
+        /*
+         * Get the ldisc ops - we may need to request them to be loaded
+         * dynamically and try again.
+         */
+        ldops = get_ldops(disc);
+        if (IS_ERR(ldops)) {
+                request_module("tty-ldisc-%d", disc);
+                ldops = get_ldops(disc);
+                if (IS_ERR(ldops))
+                        return ERR_CAST(ldops);
+        }
+
+        ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL);
+        if (ld == NULL) {
+                put_ldops(ldops);
+                return ERR_PTR(-ENOMEM);
+        }
+
+        ld->ops = ldops;
+        atomic_set(&ld->users, 1);
+        return ld;
+}
+
+static void *tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos)
+{
+        return (*pos < NR_LDISCS) ? pos : NULL;
+}
+
+static void *tty_ldiscs_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        (*pos)++;
+        return (*pos < NR_LDISCS) ? pos : NULL;
+}
+
+static void tty_ldiscs_seq_stop(struct seq_file *m, void *v)
+{
+}
+
+static int tty_ldiscs_seq_show(struct seq_file *m, void *v)
+{
+        int i = *(loff_t *)v;
+        struct tty_ldisc_ops *ldops;
+
+        ldops = get_ldops(i);
+        if (IS_ERR(ldops))
+                return 0;
+        seq_printf(m, "%-10s %2d\n", ldops->name ? ldops->name : "???", i);
+        put_ldops(ldops);
+        return 0;
+}
+
+static const struct seq_operations tty_ldiscs_seq_ops = {
+        .start  = tty_ldiscs_seq_start,
+        .next   = tty_ldiscs_seq_next,
+        .stop   = tty_ldiscs_seq_stop,
+        .show   = tty_ldiscs_seq_show,
+};
+
+static int proc_tty_ldiscs_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &tty_ldiscs_seq_ops);
+}
+
+const struct file_operations tty_ldiscs_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = proc_tty_ldiscs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+
+/**
+ *      tty_ldisc_assign        -       set ldisc on a tty
+ *      @tty: tty to assign
+ *      @ld: line discipline
+ *
+ *      Install an instance of a line discipline into a tty structure. The
+ *      ldisc must have a reference count above zero to ensure it remains.
+ *      The tty instance refcount starts at zero.
+ *
+ *      Locking:
+ *              Caller must hold references
+ */
+
+static void tty_ldisc_assign(struct tty_struct *tty, struct tty_ldisc *ld)
+{
+        tty->ldisc = ld;
+}
+
+/**
+ *      tty_ldisc_try           -       internal helper
+ *      @tty: the tty
+ *
+ *      Make a single attempt to grab and bump the refcount on
+ *      the tty ldisc. Return 0 on failure or 1 on success. This is
+ *      used to implement both the waiting and non waiting versions
+ *      of tty_ldisc_ref
+ *
+ *      Locking: takes tty_ldisc_lock
+ */
+
+static struct tty_ldisc *tty_ldisc_try(struct tty_struct *tty)
+{
+        unsigned long flags;
+        struct tty_ldisc *ld;
+
+        spin_lock_irqsave(&tty_ldisc_lock, flags);
+        ld = NULL;
+        if (test_bit(TTY_LDISC, &tty->flags))
+                ld = get_ldisc(tty->ldisc);
+        spin_unlock_irqrestore(&tty_ldisc_lock, flags);
+        return ld;
+}
+
+/**
+ *      tty_ldisc_ref_wait      -       wait for the tty ldisc
+ *      @tty: tty device
+ *
+ *      Dereference the line discipline for the terminal and take a
+ *      reference to it. If the line discipline is in flux then
+ *      wait patiently until it changes.
+ *
+ *      Note: Must not be called from an IRQ/timer context. The caller
+ *      must also be careful not to hold other locks that will deadlock
+ *      against a discipline change, such as an existing ldisc reference
+ *      (which we check for)
+ *
+ *      Locking: call functions take tty_ldisc_lock
+ */
+
+struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *tty)
+{
+        struct tty_ldisc *ld;
+
+        /* wait_event is a macro */
+        wait_event(tty_ldisc_wait, (ld = tty_ldisc_try(tty)) != NULL);
+        return ld;
+}
+EXPORT_SYMBOL_GPL(tty_ldisc_ref_wait);
+
+/**
+ *      tty_ldisc_ref           -       get the tty ldisc
+ *      @tty: tty device
+ *
+ *      Dereference the line discipline for the terminal and take a
+ *      reference to it. If the line discipline is in flux then
+ *      return NULL. Can be called from IRQ and timer functions.
+ *
+ *      Locking: called functions take tty_ldisc_lock
+ */
+
+struct tty_ldisc *tty_ldisc_ref(struct tty_struct *tty)
+{
+        return tty_ldisc_try(tty);
+}
+EXPORT_SYMBOL_GPL(tty_ldisc_ref);
+
+/**
+ *      tty_ldisc_deref         -       free a tty ldisc reference
+ *      @ld: reference to free up
+ *
+ *      Undoes the effect of tty_ldisc_ref or tty_ldisc_ref_wait. May
+ *      be called in IRQ context.
+ *
+ *      Locking: takes tty_ldisc_lock
+ */
+
+void tty_ldisc_deref(struct tty_ldisc *ld)
+{
+        put_ldisc(ld);
+}
+EXPORT_SYMBOL_GPL(tty_ldisc_deref);
+
+static inline void tty_ldisc_put(struct tty_ldisc *ld)
+{
+        put_ldisc(ld);
+}
+
+/**
+ *      tty_ldisc_enable        -       allow ldisc use
+ *      @tty: terminal to activate ldisc on
+ *
+ *      Set the TTY_LDISC flag when the line discipline can be called
+ *      again. Do necessary wakeups for existing sleepers. Clear the LDISC
+ *      changing flag to indicate any ldisc change is now over.
+ *
+ *      Note: nobody should set the TTY_LDISC bit except via this function.
+ *      Clearing directly is allowed.
+ */
+
+void tty_ldisc_enable(struct tty_struct *tty)
+{
+        set_bit(TTY_LDISC, &tty->flags);
+        clear_bit(TTY_LDISC_CHANGING, &tty->flags);
+        wake_up(&tty_ldisc_wait);
+}
+
+/**
+ *      tty_ldisc_flush -       flush line discipline queue
+ *      @tty: tty
+ *
+ *      Flush the line discipline queue (if any) for this tty. If there
+ *      is no line discipline active this is a no-op.
+ */
+
+void tty_ldisc_flush(struct tty_struct *tty)
+{
+        struct tty_ldisc *ld = tty_ldisc_ref(tty);
+        if (ld) {
+                if (ld->ops->flush_buffer)
+                        ld->ops->flush_buffer(tty);
+                tty_ldisc_deref(ld);
+        }
+        tty_buffer_flush(tty);
+}
+EXPORT_SYMBOL_GPL(tty_ldisc_flush);
+
+/**
+ *      tty_set_termios_ldisc           -       set ldisc field
+ *      @tty: tty structure
+ *      @num: line discipline number
+ *
+ *      This is probably overkill for real world processors but
+ *      they are not on hot paths so a little discipline won't do
+ *      any harm.
+ *
+ *      Locking: takes termios_mutex
+ */
+
+static void tty_set_termios_ldisc(struct tty_struct *tty, int num)
+{
+        mutex_lock(&tty->termios_mutex);
+        tty->termios->c_line = num;
+        mutex_unlock(&tty->termios_mutex);
+}
+
+/**
+ *      tty_ldisc_open          -       open a line discipline
+ *      @tty: tty we are opening the ldisc on
+ *      @ld: discipline to open
+ *
+ *      A helper opening method. Also a convenient debugging and check
+ *      point.
+ *
+ *      Locking: always called with BTM already held.
+ */
+
+static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
+{
+        WARN_ON(test_and_set_bit(TTY_LDISC_OPEN, &tty->flags));
+        if (ld->ops->open) {
+                int ret;
+                /* BTM here locks versus a hangup event */
+                WARN_ON(!tty_locked());
+                ret = ld->ops->open(tty);
+                if (ret)
+                        clear_bit(TTY_LDISC_OPEN, &tty->flags);
+                return ret;
+        }
+        return 0;
+}
+
+/**
+ *      tty_ldisc_close         -       close a line discipline
+ *      @tty: tty we are opening the ldisc on
+ *      @ld: discipline to close
+ *
+ *      A helper close method. Also a convenient debugging and check
+ *      point.
+ */
+
+static void tty_ldisc_close(struct tty_struct *tty, struct tty_ldisc *ld)
+{
+        WARN_ON(!test_bit(TTY_LDISC_OPEN, &tty->flags));
+        clear_bit(TTY_LDISC_OPEN, &tty->flags);
+        if (ld->ops->close)
+                ld->ops->close(tty);
+}
+
+/**
+ *      tty_ldisc_restore       -       helper for tty ldisc change
+ *      @tty: tty to recover
+ *      @old: previous ldisc
+ *
+ *      Restore the previous line discipline or N_TTY when a line discipline
+ *      change fails due to an open error
+ */
+
+static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
+{
+        char buf[64];
+        struct tty_ldisc *new_ldisc;
+        int r;
+
+        /* There is an outstanding reference here so this is safe */
+        old = tty_ldisc_get(old->ops->num);
+        WARN_ON(IS_ERR(old));
+        tty_ldisc_assign(tty, old);
+        tty_set_termios_ldisc(tty, old->ops->num);
+        if (tty_ldisc_open(tty, old) < 0) {
+                tty_ldisc_put(old);
+                /* This driver is always present */
+                new_ldisc = tty_ldisc_get(N_TTY);
+                if (IS_ERR(new_ldisc))
+                        panic("n_tty: get");
+                tty_ldisc_assign(tty, new_ldisc);
+                tty_set_termios_ldisc(tty, N_TTY);
+                r = tty_ldisc_open(tty, new_ldisc);
+                if (r < 0)
+                        panic("Couldn't open N_TTY ldisc for "
+                              "%s --- error %d.",
+                              tty_name(tty, buf), r);
+        }
+}
+
+/**
+ *      tty_ldisc_halt          -       shut down the line discipline
+ *      @tty: tty device
+ *
+ *      Shut down the line discipline and work queue for this tty device.
+ *      The TTY_LDISC flag being cleared ensures no further references can
+ *      be obtained while the delayed work queue halt ensures that no more
+ *      data is fed to the ldisc.
+ *
+ *      You need to do a 'flush_scheduled_work()' (outside the ldisc_mutex)
+ *      in order to make sure any currently executing ldisc work is also
+ *      flushed.
+ */
+
+static int tty_ldisc_halt(struct tty_struct *tty)
+{
+        clear_bit(TTY_LDISC, &tty->flags);
+        return cancel_work_sync(&tty->buf.work);
+}
+
+/**
+ *      tty_ldisc_flush_works   -       flush all works of a tty
+ *      @tty: tty device to flush works for
+ *
+ *      Sync flush all works belonging to @tty.
+ */
+static void tty_ldisc_flush_works(struct tty_struct *tty)
+{
+        flush_work_sync(&tty->hangup_work);
+        flush_work_sync(&tty->SAK_work);
+        flush_work_sync(&tty->buf.work);
+}
+
+/**
+ *      tty_ldisc_wait_idle     -       wait for the ldisc to become idle
+ *      @tty: tty to wait for
+ *
+ *      Wait for the line discipline to become idle. The discipline must
+ *      have been halted for this to guarantee it remains idle.
+ */
+static int tty_ldisc_wait_idle(struct tty_struct *tty)
+{
+        int ret;
+        ret = wait_event_timeout(tty_ldisc_idle,
+                        atomic_read(&tty->ldisc->users) == 1, 5 * HZ);
+        if (ret < 0)
+                return ret;
+        return ret > 0 ? 0 : -EBUSY;
+}
+
+/**
+ *      tty_set_ldisc           -       set line discipline
+ *      @tty: the terminal to set
+ *      @ldisc: the line discipline
+ *
+ *      Set the discipline of a tty line. Must be called from a process
+ *      context. The ldisc change logic has to protect itself against any
+ *      overlapping ldisc change (including on the other end of pty pairs),
+ *      the close of one side of a tty/pty pair, and eventually hangup.
+ *
+ *      Locking: takes tty_ldisc_lock, termios_mutex
+ */
+
+int tty_set_ldisc(struct tty_struct *tty, int ldisc)
+{
+        int retval;
+        struct tty_ldisc *o_ldisc, *new_ldisc;
+        int work, o_work = 0;
+        struct tty_struct *o_tty;
+
+        new_ldisc = tty_ldisc_get(ldisc);
+        if (IS_ERR(new_ldisc))
+                return PTR_ERR(new_ldisc);
+
+        tty_lock();
+        /*
+         *      We need to look at the tty locking here for pty/tty pairs
+         *      when both sides try to change in parallel.
+         */
+
+        o_tty = tty->link;      /* o_tty is the pty side or NULL */
+
+
+        /*
+         *      Check the no-op case
+         */
+
+        if (tty->ldisc->ops->num == ldisc) {
+                tty_unlock();
+                tty_ldisc_put(new_ldisc);
+                return 0;
+        }
+
+        tty_unlock();
+        /*
+         *      Problem: What do we do if this blocks ?
+         *      We could deadlock here
+         */
+
+        tty_wait_until_sent(tty, 0);
+
+        tty_lock();
+        mutex_lock(&tty->ldisc_mutex);
+
+        /*
+         *      We could be midstream of another ldisc change which has
+         *      dropped the lock during processing. If so we need to wait.
+         */
+
+        while (test_bit(TTY_LDISC_CHANGING, &tty->flags)) {
+                mutex_unlock(&tty->ldisc_mutex);
+                tty_unlock();
+                wait_event(tty_ldisc_wait,
+                        test_bit(TTY_LDISC_CHANGING, &tty->flags) == 0);
+                tty_lock();
+                mutex_lock(&tty->ldisc_mutex);
+        }
+
+        set_bit(TTY_LDISC_CHANGING, &tty->flags);
+
+        /*
+         *      No more input please, we are switching. The new ldisc
+         *      will update this value in the ldisc open function
+         */
+
+        tty->receive_room = 0;
+
+        o_ldisc = tty->ldisc;
+
+        tty_unlock();
+        /*
+         *      Make sure we don't change while someone holds a
+         *      reference to the line discipline. The TTY_LDISC bit
+         *      prevents anyone taking a reference once it is clear.
+         *      We need the lock to avoid racing reference takers.
+         *
+         *      We must clear the TTY_LDISC bit here to avoid a livelock
+         *      with a userspace app continually trying to use the tty in
+         *      parallel to the change and re-referencing the tty.
+         */
+
+        work = tty_ldisc_halt(tty);
+        if (o_tty)
+                o_work = tty_ldisc_halt(o_tty);
+
+        /*
+         * Wait for ->hangup_work and ->buf.work handlers to terminate.
+         * We must drop the mutex here in case a hangup is also in process.
+         */
+
+        mutex_unlock(&tty->ldisc_mutex);
+
+        tty_ldisc_flush_works(tty);
+
+        retval = tty_ldisc_wait_idle(tty);
+
+        tty_lock();
+        mutex_lock(&tty->ldisc_mutex);
+
+        /* handle wait idle failure locked */
+        if (retval) {
+                tty_ldisc_put(new_ldisc);
+                goto enable;
+        }
+
+        if (test_bit(TTY_HUPPED, &tty->flags)) {
+                /* We were raced by the hangup method. It will have stomped
+                   the ldisc data and closed the ldisc down */
+                clear_bit(TTY_LDISC_CHANGING, &tty->flags);
+                mutex_unlock(&tty->ldisc_mutex);
+                tty_ldisc_put(new_ldisc);
+                tty_unlock();
+                return -EIO;
+        }
+
+        /* Shutdown the current discipline. */
+        tty_ldisc_close(tty, o_ldisc);
+
+        /* Now set up the new line discipline. */
+        tty_ldisc_assign(tty, new_ldisc);
+        tty_set_termios_ldisc(tty, ldisc);
+
+        retval = tty_ldisc_open(tty, new_ldisc);
+        if (retval < 0) {
+                /* Back to the old one or N_TTY if we can't */
+                tty_ldisc_put(new_ldisc);
+                tty_ldisc_restore(tty, o_ldisc);
+        }
+
+        /* At this point we hold a reference to the new ldisc and a
+           a reference to the old ldisc. If we ended up flipping back
+           to the existing ldisc we have two references to it */
+
+        if (tty->ldisc->ops->num != o_ldisc->ops->num && tty->ops->set_ldisc)
+                tty->ops->set_ldisc(tty);
+
+        tty_ldisc_put(o_ldisc);
+
+enable:
+        /*
+         *      Allow ldisc referencing to occur again
+         */
+
+        tty_ldisc_enable(tty);
+        if (o_tty)
+                tty_ldisc_enable(o_tty);
+
+        /* Restart the work queue in case no characters kick it off. Safe if
+           already running */
+        if (work)
+                schedule_work(&tty->buf.work);
+        if (o_work)
+                schedule_work(&o_tty->buf.work);
+        mutex_unlock(&tty->ldisc_mutex);
+        tty_unlock();
+        return retval;
+}
+
+/**
+ *      tty_reset_termios       -       reset terminal state
+ *      @tty: tty to reset
+ *
+ *      Restore a terminal to the driver default state.
+ */
+
+static void tty_reset_termios(struct tty_struct *tty)
+{
+        mutex_lock(&tty->termios_mutex);
+        *tty->termios = tty->driver->init_termios;
+        tty->termios->c_ispeed = tty_termios_input_baud_rate(tty->termios);
+        tty->termios->c_ospeed = tty_termios_baud_rate(tty->termios);
+        mutex_unlock(&tty->termios_mutex);
+}
+
+
+/**
+ *      tty_ldisc_reinit        -       reinitialise the tty ldisc
+ *      @tty: tty to reinit
+ *      @ldisc: line discipline to reinitialize
+ *
+ *      Switch the tty to a line discipline and leave the ldisc
+ *      state closed
+ */
+
+static int tty_ldisc_reinit(struct tty_struct *tty, int ldisc)
+{
+        struct tty_ldisc *ld = tty_ldisc_get(ldisc);
+
+        if (IS_ERR(ld))
+                return -1;
+
+        WARN_ON_ONCE(tty_ldisc_wait_idle(tty));
+
+        tty_ldisc_close(tty, tty->ldisc);
+        tty_ldisc_put(tty->ldisc);
+        tty->ldisc = NULL;
+        /*
+         *      Switch the line discipline back
+         */
+        tty_ldisc_assign(tty, ld);
+        tty_set_termios_ldisc(tty, ldisc);
+
+        return 0;
+}
+
+/**
+ *      tty_ldisc_hangup                -       hangup ldisc reset
+ *      @tty: tty being hung up
+ *
+ *      Some tty devices reset their termios when they receive a hangup
+ *      event. In that situation we must also switch back to N_TTY properly
+ *      before we reset the termios data.
+ *
+ *      Locking: We can take the ldisc mutex as the rest of the code is
+ *      careful to allow for this.
+ *
+ *      In the pty pair case this occurs in the close() path of the
+ *      tty itself so we must be careful about locking rules.
+ */
+
+void tty_ldisc_hangup(struct tty_struct *tty)
+{
+        struct tty_ldisc *ld;
+        int reset = tty->driver->flags & TTY_DRIVER_RESET_TERMIOS;
+        int err = 0;
+
+        /*
+         * FIXME! What are the locking issues here? This may me overdoing
+         * things... This question is especially important now that we've
+         * removed the irqlock.
+         */
+        ld = tty_ldisc_ref(tty);
+        if (ld != NULL) {
+                /* We may have no line discipline at this point */
+                if (ld->ops->flush_buffer)
+                        ld->ops->flush_buffer(tty);
+                tty_driver_flush_buffer(tty);
+                if ((test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) &&
+                    ld->ops->write_wakeup)
+                        ld->ops->write_wakeup(tty);
+                if (ld->ops->hangup)
+                        ld->ops->hangup(tty);
+                tty_ldisc_deref(ld);
+        }
+        /*
+         * FIXME: Once we trust the LDISC code better we can wait here for
+         * ldisc completion and fix the driver call race
+         */
+        wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+        wake_up_interruptible_poll(&tty->read_wait, POLLIN);
+        /*
+         * Shutdown the current line discipline, and reset it to
+         * N_TTY if need be.
+         *
+         * Avoid racing set_ldisc or tty_ldisc_release
+         */
+        mutex_lock(&tty->ldisc_mutex);
+
+        /*
+         * this is like tty_ldisc_halt, but we need to give up
+         * the BTM before calling cancel_work_sync, which may
+         * need to wait for another function taking the BTM
+         */
+        clear_bit(TTY_LDISC, &tty->flags);
+        tty_unlock();
+        cancel_work_sync(&tty->buf.work);
+        mutex_unlock(&tty->ldisc_mutex);
+
+        tty_lock();
+        mutex_lock(&tty->ldisc_mutex);
+
+        /* At this point we have a closed ldisc and we want to
+           reopen it. We could defer this to the next open but
+           it means auditing a lot of other paths so this is
+           a FIXME */
+        if (tty->ldisc) {       /* Not yet closed */
+                if (reset == 0) {
+
+                        if (!tty_ldisc_reinit(tty, tty->termios->c_line))
+                                err = tty_ldisc_open(tty, tty->ldisc);
+                        else
+                                err = 1;
+                }
+                /* If the re-open fails or we reset then go to N_TTY. The
+                   N_TTY open cannot fail */
+                if (reset || err) {
+                        BUG_ON(tty_ldisc_reinit(tty, N_TTY));
+                        WARN_ON(tty_ldisc_open(tty, tty->ldisc));
+                }
+                tty_ldisc_enable(tty);
+        }
+        mutex_unlock(&tty->ldisc_mutex);
+        if (reset)
+                tty_reset_termios(tty);
+}
+
+/**
+ *      tty_ldisc_setup                 -       open line discipline
+ *      @tty: tty being shut down
+ *      @o_tty: pair tty for pty/tty pairs
+ *
+ *      Called during the initial open of a tty/pty pair in order to set up the
+ *      line disciplines and bind them to the tty. This has no locking issues
+ *      as the device isn't yet active.
+ */
+
+int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty)
+{
+        struct tty_ldisc *ld = tty->ldisc;
+        int retval;
+
+        retval = tty_ldisc_open(tty, ld);
+        if (retval)
+                return retval;
+
+        if (o_tty) {
+                retval = tty_ldisc_open(o_tty, o_tty->ldisc);
+                if (retval) {
+                        tty_ldisc_close(tty, ld);
+                        return retval;
+                }
+                tty_ldisc_enable(o_tty);
+        }
+        tty_ldisc_enable(tty);
+        return 0;
+}
+/**
+ *      tty_ldisc_release               -       release line discipline
+ *      @tty: tty being shut down
+ *      @o_tty: pair tty for pty/tty pairs
+ *
+ *      Called during the final close of a tty/pty pair in order to shut down
+ *      the line discpline layer. On exit the ldisc assigned is N_TTY and the
+ *      ldisc has not been opened.
+ */
+
+void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty)
+{
+        /*
+         * Prevent flush_to_ldisc() from rescheduling the work for later.  Then
+         * kill any delayed work. As this is the final close it does not
+         * race with the set_ldisc code path.
+         */
+
+        tty_unlock();
+        tty_ldisc_halt(tty);
+        tty_ldisc_flush_works(tty);
+        tty_lock();
+
+        mutex_lock(&tty->ldisc_mutex);
+        /*
+         * Now kill off the ldisc
+         */
+        tty_ldisc_close(tty, tty->ldisc);
+        tty_ldisc_put(tty->ldisc);
+        /* Force an oops if we mess this up */
+        tty->ldisc = NULL;
+
+        /* Ensure the next open requests the N_TTY ldisc */
+        tty_set_termios_ldisc(tty, N_TTY);
+        mutex_unlock(&tty->ldisc_mutex);
+
+        /* This will need doing differently if we need to lock */
+        if (o_tty)
+                tty_ldisc_release(o_tty, NULL);
+
+        /* And the memory resources remaining (buffers, termios) will be
+           disposed of when the kref hits zero */
+}
+
+/**
+ *      tty_ldisc_init          -       ldisc setup for new tty
+ *      @tty: tty being allocated
+ *
+ *      Set up the line discipline objects for a newly allocated tty. Note that
+ *      the tty structure is not completely set up when this call is made.
+ */
+
+void tty_ldisc_init(struct tty_struct *tty)
+{
+        struct tty_ldisc *ld = tty_ldisc_get(N_TTY);
+        if (IS_ERR(ld))
+                panic("n_tty: init_tty");
+        tty_ldisc_assign(tty, ld);
+}
+
+/**
+ *      tty_ldisc_init          -       ldisc cleanup for new tty
+ *      @tty: tty that was allocated recently
+ *
+ *      The tty structure must not becompletely set up (tty_ldisc_setup) when
+ *      this call is made.
+ */
+void tty_ldisc_deinit(struct tty_struct *tty)
+{
+        put_ldisc(tty->ldisc);
+        tty_ldisc_assign(tty, NULL);
+}
+
+void tty_ldisc_begin(void)
+{
+        /* Setup the default TTY line discipline. */
+        (void) tty_register_ldisc(N_TTY, &tty_ldisc_N_TTY);
+}
diff --git a/drivers/tty/tty_mutex.c b/drivers/tty/tty_mutex.c
new file mode 100644
index 000000000000..3b2bb7719442
--- /dev/null
+++ b/drivers/tty/tty_mutex.c
@@ -0,0 +1,44 @@
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/semaphore.h>
+#include <linux/sched.h>
+
+/*
+ * The 'big tty mutex'
+ *
+ * This mutex is taken and released by tty_lock() and tty_unlock(),
+ * replacing the older big kernel lock.
+ * It can no longer be taken recursively, and does not get
+ * released implicitly while sleeping.
+ *
+ * Don't use in new code.
+ */
+static DEFINE_MUTEX(big_tty_mutex);
+struct task_struct *__big_tty_mutex_owner;
+EXPORT_SYMBOL_GPL(__big_tty_mutex_owner);
+
+/*
+ * Getting the big tty mutex.
+ */
+void __lockfunc tty_lock(void)
+{
+        struct task_struct *task = current;
+
+        WARN_ON(__big_tty_mutex_owner == task);
+
+        mutex_lock(&big_tty_mutex);
+        __big_tty_mutex_owner = task;
+}
+EXPORT_SYMBOL(tty_lock);
+
+void __lockfunc tty_unlock(void)
+{
+        struct task_struct *task = current;
+
+        WARN_ON(__big_tty_mutex_owner != task);
+        __big_tty_mutex_owner = NULL;
+
+        mutex_unlock(&big_tty_mutex);
+}
+EXPORT_SYMBOL(tty_unlock);
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
new file mode 100644
index 000000000000..33d37d230f8f
--- /dev/null
+++ b/drivers/tty/tty_port.c
@@ -0,0 +1,446 @@
+/*
+ * Tty port functions
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+
+void tty_port_init(struct tty_port *port)
+{
+        memset(port, 0, sizeof(*port));
+        init_waitqueue_head(&port->open_wait);
+        init_waitqueue_head(&port->close_wait);
+        init_waitqueue_head(&port->delta_msr_wait);
+        mutex_init(&port->mutex);
+        mutex_init(&port->buf_mutex);
+        spin_lock_init(&port->lock);
+        port->close_delay = (50 * HZ) / 100;
+        port->closing_wait = (3000 * HZ) / 100;
+        kref_init(&port->kref);
+}
+EXPORT_SYMBOL(tty_port_init);
+
+int tty_port_alloc_xmit_buf(struct tty_port *port)
+{
+        /* We may sleep in get_zeroed_page() */
+        mutex_lock(&port->buf_mutex);
+        if (port->xmit_buf == NULL)
+                port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
+        mutex_unlock(&port->buf_mutex);
+        if (port->xmit_buf == NULL)
+                return -ENOMEM;
+        return 0;
+}
+EXPORT_SYMBOL(tty_port_alloc_xmit_buf);
+
+void tty_port_free_xmit_buf(struct tty_port *port)
+{
+        mutex_lock(&port->buf_mutex);
+        if (port->xmit_buf != NULL) {
+                free_page((unsigned long)port->xmit_buf);
+                port->xmit_buf = NULL;
+        }
+        mutex_unlock(&port->buf_mutex);
+}
+EXPORT_SYMBOL(tty_port_free_xmit_buf);
+
+static void tty_port_destructor(struct kref *kref)
+{
+        struct tty_port *port = container_of(kref, struct tty_port, kref);
+        if (port->xmit_buf)
+                free_page((unsigned long)port->xmit_buf);
+        if (port->ops->destruct)
+                port->ops->destruct(port);
+        else
+                kfree(port);
+}
+
+void tty_port_put(struct tty_port *port)
+{
+        if (port)
+                kref_put(&port->kref, tty_port_destructor);
+}
+EXPORT_SYMBOL(tty_port_put);
+
+/**
+ *      tty_port_tty_get        -       get a tty reference
+ *      @port: tty port
+ *
+ *      Return a refcount protected tty instance or NULL if the port is not
+ *      associated with a tty (eg due to close or hangup)
+ */
+
+struct tty_struct *tty_port_tty_get(struct tty_port *port)
+{
+        unsigned long flags;
+        struct tty_struct *tty;
+
+        spin_lock_irqsave(&port->lock, flags);
+        tty = tty_kref_get(port->tty);
+        spin_unlock_irqrestore(&port->lock, flags);
+        return tty;
+}
+EXPORT_SYMBOL(tty_port_tty_get);
+
+/**
+ *      tty_port_tty_set        -       set the tty of a port
+ *      @port: tty port
+ *      @tty: the tty
+ *
+ *      Associate the port and tty pair. Manages any internal refcounts.
+ *      Pass NULL to deassociate a port
+ */
+
+void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        if (port->tty)
+                tty_kref_put(port->tty);
+        port->tty = tty_kref_get(tty);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL(tty_port_tty_set);
+
+static void tty_port_shutdown(struct tty_port *port)
+{
+        mutex_lock(&port->mutex);
+        if (port->ops->shutdown && !port->console &&
+                test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags))
+                        port->ops->shutdown(port);
+        mutex_unlock(&port->mutex);
+}
+
+/**
+ *      tty_port_hangup         -       hangup helper
+ *      @port: tty port
+ *
+ *      Perform port level tty hangup flag and count changes. Drop the tty
+ *      reference.
+ */
+
+void tty_port_hangup(struct tty_port *port)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        port->count = 0;
+        port->flags &= ~ASYNC_NORMAL_ACTIVE;
+        if (port->tty) {
+                set_bit(TTY_IO_ERROR, &port->tty->flags);
+                tty_kref_put(port->tty);
+        }
+        port->tty = NULL;
+        spin_unlock_irqrestore(&port->lock, flags);
+        wake_up_interruptible(&port->open_wait);
+        wake_up_interruptible(&port->delta_msr_wait);
+        tty_port_shutdown(port);
+}
+EXPORT_SYMBOL(tty_port_hangup);
+
+/**
+ *      tty_port_carrier_raised -       carrier raised check
+ *      @port: tty port
+ *
+ *      Wrapper for the carrier detect logic. For the moment this is used
+ *      to hide some internal details. This will eventually become entirely
+ *      internal to the tty port.
+ */
+
+int tty_port_carrier_raised(struct tty_port *port)
+{
+        if (port->ops->carrier_raised == NULL)
+                return 1;
+        return port->ops->carrier_raised(port);
+}
+EXPORT_SYMBOL(tty_port_carrier_raised);
+
+/**
+ *      tty_port_raise_dtr_rts  -       Raise DTR/RTS
+ *      @port: tty port
+ *
+ *      Wrapper for the DTR/RTS raise logic. For the moment this is used
+ *      to hide some internal details. This will eventually become entirely
+ *      internal to the tty port.
+ */
+
+void tty_port_raise_dtr_rts(struct tty_port *port)
+{
+        if (port->ops->dtr_rts)
+                port->ops->dtr_rts(port, 1);
+}
+EXPORT_SYMBOL(tty_port_raise_dtr_rts);
+
+/**
+ *      tty_port_lower_dtr_rts  -       Lower DTR/RTS
+ *      @port: tty port
+ *
+ *      Wrapper for the DTR/RTS raise logic. For the moment this is used
+ *      to hide some internal details. This will eventually become entirely
+ *      internal to the tty port.
+ */
+
+void tty_port_lower_dtr_rts(struct tty_port *port)
+{
+        if (port->ops->dtr_rts)
+                port->ops->dtr_rts(port, 0);
+}
+EXPORT_SYMBOL(tty_port_lower_dtr_rts);
+
+/**
+ *      tty_port_block_til_ready        -       Waiting logic for tty open
+ *      @port: the tty port being opened
+ *      @tty: the tty device being bound
+ *      @filp: the file pointer of the opener
+ *
+ *      Implement the core POSIX/SuS tty behaviour when opening a tty device.
+ *      Handles:
+ *              - hangup (both before and during)
+ *              - non blocking open
+ *              - rts/dtr/dcd
+ *              - signals
+ *              - port flags and counts
+ *
+ *      The passed tty_port must implement the carrier_raised method if it can
+ *      do carrier detect and the dtr_rts method if it supports software
+ *      management of these lines. Note that the dtr/rts raise is done each
+ *      iteration as a hangup may have previously dropped them while we wait.
+ */
+
+int tty_port_block_til_ready(struct tty_port *port,
+                                struct tty_struct *tty, struct file *filp)
+{
+        int do_clocal = 0, retval;
+        unsigned long flags;
+        DEFINE_WAIT(wait);
+        int cd;
+
+        /* block if port is in the process of being closed */
+        if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
+                wait_event_interruptible_tty(port->close_wait,
+                                !(port->flags & ASYNC_CLOSING));
+                if (port->flags & ASYNC_HUP_NOTIFY)
+                        return -EAGAIN;
+                else
+                        return -ERESTARTSYS;
+        }
+
+        /* if non-blocking mode is set we can pass directly to open unless
+           the port has just hung up or is in another error state */
+        if (tty->flags & (1 << TTY_IO_ERROR)) {
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+        if (filp->f_flags & O_NONBLOCK) {
+                /* Indicate we are open */
+                if (tty->termios->c_cflag & CBAUD)
+                        tty_port_raise_dtr_rts(port);
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+                return 0;
+        }
+
+        if (C_CLOCAL(tty))
+                do_clocal = 1;
+
+        /* Block waiting until we can proceed. We may need to wait for the
+           carrier, but we must also wait for any close that is in progress
+           before the next open may complete */
+
+        retval = 0;
+
+        /* The port lock protects the port counts */
+        spin_lock_irqsave(&port->lock, flags);
+        if (!tty_hung_up_p(filp))
+                port->count--;
+        port->blocked_open++;
+        spin_unlock_irqrestore(&port->lock, flags);
+
+        while (1) {
+                /* Indicate we are open */
+                if (tty->termios->c_cflag & CBAUD)
+                        tty_port_raise_dtr_rts(port);
+
+                prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
+                /* Check for a hangup or uninitialised port.
+                                                        Return accordingly */
+                if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
+                        if (port->flags & ASYNC_HUP_NOTIFY)
+                                retval = -EAGAIN;
+                        else
+                                retval = -ERESTARTSYS;
+                        break;
+                }
+                /* Probe the carrier. For devices with no carrier detect this
+                   will always return true */
+                cd = tty_port_carrier_raised(port);
+                if (!(port->flags & ASYNC_CLOSING) &&
+                                (do_clocal || cd))
+                        break;
+                if (signal_pending(current)) {
+                        retval = -ERESTARTSYS;
+                        break;
+                }
+                tty_unlock();
+                schedule();
+                tty_lock();
+        }
+        finish_wait(&port->open_wait, &wait);
+
+        /* Update counts. A parallel hangup will have set count to zero and
+           we must not mess that up further */
+        spin_lock_irqsave(&port->lock, flags);
+        if (!tty_hung_up_p(filp))
+                port->count++;
+        port->blocked_open--;
+        if (retval == 0)
+                port->flags |= ASYNC_NORMAL_ACTIVE;
+        spin_unlock_irqrestore(&port->lock, flags);
+        return retval;
+}
+EXPORT_SYMBOL(tty_port_block_til_ready);
+
+int tty_port_close_start(struct tty_port *port,
+                                struct tty_struct *tty, struct file *filp)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        if (tty_hung_up_p(filp)) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                return 0;
+        }
+
+        if (tty->count == 1 && port->count != 1) {
+                printk(KERN_WARNING
+                    "tty_port_close_start: tty->count = 1 port count = %d.\n",
+                                                                port->count);
+                port->count = 1;
+        }
+        if (--port->count < 0) {
+                printk(KERN_WARNING "tty_port_close_start: count = %d\n",
+                                                                port->count);
+                port->count = 0;
+        }
+
+        if (port->count) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                if (port->ops->drop)
+                        port->ops->drop(port);
+                return 0;
+        }
+        set_bit(ASYNCB_CLOSING, &port->flags);
+        tty->closing = 1;
+        spin_unlock_irqrestore(&port->lock, flags);
+        /* Don't block on a stalled port, just pull the chain */
+        if (tty->flow_stopped)
+                tty_driver_flush_buffer(tty);
+        if (test_bit(ASYNCB_INITIALIZED, &port->flags) &&
+                        port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+                tty_wait_until_sent(tty, port->closing_wait);
+        if (port->drain_delay) {
+                unsigned int bps = tty_get_baud_rate(tty);
+                long timeout;
+
+                if (bps > 1200)
+                        timeout = max_t(long,
+                                (HZ * 10 * port->drain_delay) / bps, HZ / 10);
+                else
+                        timeout = 2 * HZ;
+                schedule_timeout_interruptible(timeout);
+        }
+        /* Flush the ldisc buffering */
+        tty_ldisc_flush(tty);
+
+        /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to
+           hang up the line */
+        if (tty->termios->c_cflag & HUPCL)
+                tty_port_lower_dtr_rts(port);
+
+        /* Don't call port->drop for the last reference. Callers will want
+           to drop the last active reference in ->shutdown() or the tty
+           shutdown path */
+        return 1;
+}
+EXPORT_SYMBOL(tty_port_close_start);
+
+void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&port->lock, flags);
+        tty->closing = 0;
+
+        if (port->blocked_open) {
+                spin_unlock_irqrestore(&port->lock, flags);
+                if (port->close_delay) {
+                        msleep_interruptible(
+                                jiffies_to_msecs(port->close_delay));
+                }
+                spin_lock_irqsave(&port->lock, flags);
+                wake_up_interruptible(&port->open_wait);
+        }
+        port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
+        wake_up_interruptible(&port->close_wait);
+        spin_unlock_irqrestore(&port->lock, flags);
+}
+EXPORT_SYMBOL(tty_port_close_end);
+
+void tty_port_close(struct tty_port *port, struct tty_struct *tty,
+                                                        struct file *filp)
+{
+        if (tty_port_close_start(port, tty, filp) == 0)
+                return;
+        tty_port_shutdown(port);
+        set_bit(TTY_IO_ERROR, &tty->flags);
+        tty_port_close_end(port, tty);
+        tty_port_tty_set(port, NULL);
+}
+EXPORT_SYMBOL(tty_port_close);
+
+int tty_port_open(struct tty_port *port, struct tty_struct *tty,
+                                                        struct file *filp)
+{
+        spin_lock_irq(&port->lock);
+        if (!tty_hung_up_p(filp))
+                ++port->count;
+        spin_unlock_irq(&port->lock);
+        tty_port_tty_set(port, tty);
+
+        /*
+         * Do the device-specific open only if the hardware isn't
+         * already initialized. Serialize open and shutdown using the
+         * port mutex.
+         */
+
+        mutex_lock(&port->mutex);
+
+        if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+                clear_bit(TTY_IO_ERROR, &tty->flags);
+                if (port->ops->activate) {
+                        int retval = port->ops->activate(port, tty);
+                        if (retval) {
+                                mutex_unlock(&port->mutex);
+                                return retval;
+                        }
+                }
+                set_bit(ASYNCB_INITIALIZED, &port->flags);
+        }
+        mutex_unlock(&port->mutex);
+        return tty_port_block_til_ready(port, tty, filp);
+}
+
+EXPORT_SYMBOL(tty_port_open);
diff --git a/drivers/tty/vt/.gitignore b/drivers/tty/vt/.gitignore
new file mode 100644
index 000000000000..83683a2d8e6a
--- /dev/null
+++ b/drivers/tty/vt/.gitignore
@@ -0,0 +1,2 @@
+consolemap_deftbl.c
+defkeymap.c
diff --git a/drivers/tty/vt/Makefile b/drivers/tty/vt/Makefile
new file mode 100644
index 000000000000..14a51c9960df
--- /dev/null
+++ b/drivers/tty/vt/Makefile
@@ -0,0 +1,34 @@
+#
+# This file contains the font map for the default (hardware) font
+#
+FONTMAPFILE = cp437.uni
+
+obj-$(CONFIG_VT)                        += vt_ioctl.o vc_screen.o \
+                                           selection.o keyboard.o
+obj-$(CONFIG_CONSOLE_TRANSLATIONS)      += consolemap.o consolemap_deftbl.o
+obj-$(CONFIG_HW_CONSOLE)                += vt.o defkeymap.o
+
+# Files generated that shall be removed upon make clean
+clean-files := consolemap_deftbl.c defkeymap.c
+
+quiet_cmd_conmk = CONMK   $@
+      cmd_conmk = scripts/conmakehash $< > $@
+
+$(obj)/consolemap_deftbl.c: $(src)/$(FONTMAPFILE)
+        $(call cmd,conmk)
+
+$(obj)/defkeymap.o:  $(obj)/defkeymap.c
+
+# Uncomment if you're changing the keymap and have an appropriate
+# loadkeys version for the map. By default, we'll use the shipped
+# versions.
+# GENERATE_KEYMAP := 1
+
+ifdef GENERATE_KEYMAP
+
+$(obj)/defkeymap.c: $(obj)/%.c: $(src)/%.map
+        loadkeys --mktable $< > $@.tmp
+        sed -e 's/^static *//' $@.tmp > $@
+        rm $@.tmp
+
+endif
diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
new file mode 100644
index 000000000000..45d3e80156d4
--- /dev/null
+++ b/drivers/tty/vt/consolemap.c
@@ -0,0 +1,745 @@
+/*
+ * consolemap.c
+ *
+ * Mapping from internal code (such as Latin-1 or Unicode or IBM PC code)
+ * to font positions.
+ *
+ * aeb, 950210
+ *
+ * Support for multiple unimaps by Jakub Jelinek <jj@ultra.linux.cz>, July 1998
+ *
+ * Fix bug in inverse translation. Stanislav Voronyi <stas@cnti.uanet.kharkov.ua>, Dec 1998
+ */
+
+#include <linux/module.h>
+#include <linux/kd.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <asm/uaccess.h>
+#include <linux/consolemap.h>
+#include <linux/vt_kern.h>
+
+static unsigned short translations[][256] = {
+  /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */
+  {
+    0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
+    0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
+    0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
+    0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
+    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+    0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
+    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+    0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
+    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+    0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
+    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+    0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
+    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
+    0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
+    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
+    0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,
+    0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
+    0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
+    0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
+    0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
+    0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
+    0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
+    0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
+    0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
+    0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
+    0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
+    0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
+    0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
+    0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
+    0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
+    0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
+    0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
+  }, 
+  /* VT100 graphics mapped to Unicode */
+  {
+    0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
+    0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
+    0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
+    0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
+    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+    0x0028, 0x0029, 0x002a, 0x2192, 0x2190, 0x2191, 0x2193, 0x002f,
+    0x2588, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+    0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
+    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+    0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
+    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+    0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x00a0,
+    0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
+    0x2591, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
+    0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
+    0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x007f,
+    0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
+    0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
+    0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
+    0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
+    0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
+    0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
+    0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
+    0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
+    0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
+    0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
+    0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
+    0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
+    0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
+    0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
+    0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
+    0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
+  },
+  /* IBM Codepage 437 mapped to Unicode */
+  {
+    0x0000, 0x263a, 0x263b, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022, 
+    0x25d8, 0x25cb, 0x25d9, 0x2642, 0x2640, 0x266a, 0x266b, 0x263c,
+    0x25b6, 0x25c0, 0x2195, 0x203c, 0x00b6, 0x00a7, 0x25ac, 0x21a8,
+    0x2191, 0x2193, 0x2192, 0x2190, 0x221f, 0x2194, 0x25b2, 0x25bc,
+    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+    0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
+    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+    0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
+    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+    0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
+    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+    0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
+    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
+    0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
+    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
+    0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x2302,
+    0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, 0x00e5, 0x00e7,
+    0x00ea, 0x00eb, 0x00e8, 0x00ef, 0x00ee, 0x00ec, 0x00c4, 0x00c5,
+    0x00c9, 0x00e6, 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
+    0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5, 0x20a7, 0x0192,
+    0x00e1, 0x00ed, 0x00f3, 0x00fa, 0x00f1, 0x00d1, 0x00aa, 0x00ba,
+    0x00bf, 0x2310, 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
+    0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
+    0x2555, 0x2563, 0x2551, 0x2557, 0x255d, 0x255c, 0x255b, 0x2510,
+    0x2514, 0x2534, 0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f,
+    0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256c, 0x2567,
+    0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256b,
+    0x256a, 0x2518, 0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580,
+    0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3, 0x00b5, 0x03c4,
+    0x03a6, 0x0398, 0x03a9, 0x03b4, 0x221e, 0x03c6, 0x03b5, 0x2229,
+    0x2261, 0x00b1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248,
+    0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2, 0x25a0, 0x00a0
+  }, 
+  /* User mapping -- default to codes for direct font mapping */
+  {
+    0xf000, 0xf001, 0xf002, 0xf003, 0xf004, 0xf005, 0xf006, 0xf007,
+    0xf008, 0xf009, 0xf00a, 0xf00b, 0xf00c, 0xf00d, 0xf00e, 0xf00f,
+    0xf010, 0xf011, 0xf012, 0xf013, 0xf014, 0xf015, 0xf016, 0xf017,
+    0xf018, 0xf019, 0xf01a, 0xf01b, 0xf01c, 0xf01d, 0xf01e, 0xf01f,
+    0xf020, 0xf021, 0xf022, 0xf023, 0xf024, 0xf025, 0xf026, 0xf027,
+    0xf028, 0xf029, 0xf02a, 0xf02b, 0xf02c, 0xf02d, 0xf02e, 0xf02f,
+    0xf030, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036, 0xf037,
+    0xf038, 0xf039, 0xf03a, 0xf03b, 0xf03c, 0xf03d, 0xf03e, 0xf03f,
+    0xf040, 0xf041, 0xf042, 0xf043, 0xf044, 0xf045, 0xf046, 0xf047,
+    0xf048, 0xf049, 0xf04a, 0xf04b, 0xf04c, 0xf04d, 0xf04e, 0xf04f,
+    0xf050, 0xf051, 0xf052, 0xf053, 0xf054, 0xf055, 0xf056, 0xf057,
+    0xf058, 0xf059, 0xf05a, 0xf05b, 0xf05c, 0xf05d, 0xf05e, 0xf05f,
+    0xf060, 0xf061, 0xf062, 0xf063, 0xf064, 0xf065, 0xf066, 0xf067,
+    0xf068, 0xf069, 0xf06a, 0xf06b, 0xf06c, 0xf06d, 0xf06e, 0xf06f,
+    0xf070, 0xf071, 0xf072, 0xf073, 0xf074, 0xf075, 0xf076, 0xf077,
+    0xf078, 0xf079, 0xf07a, 0xf07b, 0xf07c, 0xf07d, 0xf07e, 0xf07f,
+    0xf080, 0xf081, 0xf082, 0xf083, 0xf084, 0xf085, 0xf086, 0xf087,
+    0xf088, 0xf089, 0xf08a, 0xf08b, 0xf08c, 0xf08d, 0xf08e, 0xf08f,
+    0xf090, 0xf091, 0xf092, 0xf093, 0xf094, 0xf095, 0xf096, 0xf097,
+    0xf098, 0xf099, 0xf09a, 0xf09b, 0xf09c, 0xf09d, 0xf09e, 0xf09f,
+    0xf0a0, 0xf0a1, 0xf0a2, 0xf0a3, 0xf0a4, 0xf0a5, 0xf0a6, 0xf0a7,
+    0xf0a8, 0xf0a9, 0xf0aa, 0xf0ab, 0xf0ac, 0xf0ad, 0xf0ae, 0xf0af,
+    0xf0b0, 0xf0b1, 0xf0b2, 0xf0b3, 0xf0b4, 0xf0b5, 0xf0b6, 0xf0b7,
+    0xf0b8, 0xf0b9, 0xf0ba, 0xf0bb, 0xf0bc, 0xf0bd, 0xf0be, 0xf0bf,
+    0xf0c0, 0xf0c1, 0xf0c2, 0xf0c3, 0xf0c4, 0xf0c5, 0xf0c6, 0xf0c7,
+    0xf0c8, 0xf0c9, 0xf0ca, 0xf0cb, 0xf0cc, 0xf0cd, 0xf0ce, 0xf0cf,
+    0xf0d0, 0xf0d1, 0xf0d2, 0xf0d3, 0xf0d4, 0xf0d5, 0xf0d6, 0xf0d7,
+    0xf0d8, 0xf0d9, 0xf0da, 0xf0db, 0xf0dc, 0xf0dd, 0xf0de, 0xf0df,
+    0xf0e0, 0xf0e1, 0xf0e2, 0xf0e3, 0xf0e4, 0xf0e5, 0xf0e6, 0xf0e7,
+    0xf0e8, 0xf0e9, 0xf0ea, 0xf0eb, 0xf0ec, 0xf0ed, 0xf0ee, 0xf0ef,
+    0xf0f0, 0xf0f1, 0xf0f2, 0xf0f3, 0xf0f4, 0xf0f5, 0xf0f6, 0xf0f7,
+    0xf0f8, 0xf0f9, 0xf0fa, 0xf0fb, 0xf0fc, 0xf0fd, 0xf0fe, 0xf0ff
+  }
+};
+
+/* The standard kernel character-to-font mappings are not invertible
+   -- this is just a best effort. */
+
+#define MAX_GLYPH 512           /* Max possible glyph value */
+
+static int inv_translate[MAX_NR_CONSOLES];
+
+struct uni_pagedir {
+        u16             **uni_pgdir[32];
+        unsigned long   refcount;
+        unsigned long   sum;
+        unsigned char   *inverse_translations[4];
+        u16             *inverse_trans_unicode;
+        int             readonly;
+};
+
+static struct uni_pagedir *dflt;
+
+static void set_inverse_transl(struct vc_data *conp, struct uni_pagedir *p, int i)
+{
+        int j, glyph;
+        unsigned short *t = translations[i];
+        unsigned char *q;
+        
+        if (!p) return;
+        q = p->inverse_translations[i];
+
+        if (!q) {
+                q = p->inverse_translations[i] = (unsigned char *) 
+                        kmalloc(MAX_GLYPH, GFP_KERNEL);
+                if (!q) return;
+        }
+        memset(q, 0, MAX_GLYPH);
+
+        for (j = 0; j < E_TABSZ; j++) {
+                glyph = conv_uni_to_pc(conp, t[j]);
+                if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) {
+                        /* prefer '-' above SHY etc. */
+                        q[glyph] = j;
+                }
+        }
+}
+
+static void set_inverse_trans_unicode(struct vc_data *conp,
+                                      struct uni_pagedir *p)
+{
+        int i, j, k, glyph;
+        u16 **p1, *p2;
+        u16 *q;
+
+        if (!p) return;
+        q = p->inverse_trans_unicode;
+        if (!q) {
+                q = p->inverse_trans_unicode =
+                        kmalloc(MAX_GLYPH * sizeof(u16), GFP_KERNEL);
+                if (!q)
+                        return;
+        }
+        memset(q, 0, MAX_GLYPH * sizeof(u16));
+
+        for (i = 0; i < 32; i++) {
+                p1 = p->uni_pgdir[i];
+                if (!p1)
+                        continue;
+                for (j = 0; j < 32; j++) {
+                        p2 = p1[j];
+                        if (!p2)
+                                continue;
+                        for (k = 0; k < 64; k++) {
+                                glyph = p2[k];
+                                if (glyph >= 0 && glyph < MAX_GLYPH
+                                               && q[glyph] < 32)
+                                        q[glyph] = (i << 11) + (j << 6) + k;
+                        }
+                }
+        }
+}
+
+unsigned short *set_translate(int m, struct vc_data *vc)
+{
+        inv_translate[vc->vc_num] = m;
+        return translations[m];
+}
+
+/*
+ * Inverse translation is impossible for several reasons:
+ * 1. The font<->character maps are not 1-1.
+ * 2. The text may have been written while a different translation map
+ *    was active.
+ * Still, it is now possible to a certain extent to cut and paste non-ASCII.
+ */
+u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode)
+{
+        struct uni_pagedir *p;
+        int m;
+        if (glyph < 0 || glyph >= MAX_GLYPH)
+                return 0;
+        else if (!(p = (struct uni_pagedir *)*conp->vc_uni_pagedir_loc))
+                return glyph;
+        else if (use_unicode) {
+                if (!p->inverse_trans_unicode)
+                        return glyph;
+                else
+                        return p->inverse_trans_unicode[glyph];
+        } else {
+                m = inv_translate[conp->vc_num];
+                if (!p->inverse_translations[m])
+                        return glyph;
+                else
+                        return p->inverse_translations[m][glyph];
+        }
+}
+EXPORT_SYMBOL_GPL(inverse_translate);
+
+static void update_user_maps(void)
+{
+        int i;
+        struct uni_pagedir *p, *q = NULL;
+        
+        for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                if (!vc_cons_allocated(i))
+                        continue;
+                p = (struct uni_pagedir *)*vc_cons[i].d->vc_uni_pagedir_loc;
+                if (p && p != q) {
+                        set_inverse_transl(vc_cons[i].d, p, USER_MAP);
+                        set_inverse_trans_unicode(vc_cons[i].d, p);
+                        q = p;
+                }
+        }
+}
+
+/*
+ * Load customizable translation table
+ * arg points to a 256 byte translation table.
+ *
+ * The "old" variants are for translation directly to font (using the
+ * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set
+ * Unicodes explicitly.
+ */
+int con_set_trans_old(unsigned char __user * arg)
+{
+        int i;
+        unsigned short *p = translations[USER_MAP];
+
+        if (!access_ok(VERIFY_READ, arg, E_TABSZ))
+                return -EFAULT;
+
+        for (i=0; i<E_TABSZ ; i++) {
+                unsigned char uc;
+                __get_user(uc, arg+i);
+                p[i] = UNI_DIRECT_BASE | uc;
+        }
+
+        update_user_maps();
+        return 0;
+}
+
+int con_get_trans_old(unsigned char __user * arg)
+{
+        int i, ch;
+        unsigned short *p = translations[USER_MAP];
+
+        if (!access_ok(VERIFY_WRITE, arg, E_TABSZ))
+                return -EFAULT;
+
+        for (i=0; i<E_TABSZ ; i++)
+          {
+            ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
+            __put_user((ch & ~0xff) ? 0 : ch, arg+i);
+          }
+        return 0;
+}
+
+int con_set_trans_new(ushort __user * arg)
+{
+        int i;
+        unsigned short *p = translations[USER_MAP];
+
+        if (!access_ok(VERIFY_READ, arg, E_TABSZ*sizeof(unsigned short)))
+                return -EFAULT;
+
+        for (i=0; i<E_TABSZ ; i++) {
+                unsigned short us;
+                __get_user(us, arg+i);
+                p[i] = us;
+        }
+
+        update_user_maps();
+        return 0;
+}
+
+int con_get_trans_new(ushort __user * arg)
+{
+        int i;
+        unsigned short *p = translations[USER_MAP];
+
+        if (!access_ok(VERIFY_WRITE, arg, E_TABSZ*sizeof(unsigned short)))
+                return -EFAULT;
+
+        for (i=0; i<E_TABSZ ; i++)
+          __put_user(p[i], arg+i);
+        
+        return 0;
+}
+
+/*
+ * Unicode -> current font conversion 
+ *
+ * A font has at most 512 chars, usually 256.
+ * But one font position may represent several Unicode chars.
+ * A hashtable is somewhat of a pain to deal with, so use a
+ * "paged table" instead.  Simulation has shown the memory cost of
+ * this 3-level paged table scheme to be comparable to a hash table.
+ */
+
+extern u8 dfont_unicount[];     /* Defined in console_defmap.c */
+extern u16 dfont_unitable[];
+
+static void con_release_unimap(struct uni_pagedir *p)
+{
+        u16 **p1;
+        int i, j;
+
+        if (p == dflt) dflt = NULL;  
+        for (i = 0; i < 32; i++) {
+                if ((p1 = p->uni_pgdir[i]) != NULL) {
+                        for (j = 0; j < 32; j++)
+                                kfree(p1[j]);
+                        kfree(p1);
+                }
+                p->uni_pgdir[i] = NULL;
+        }
+        for (i = 0; i < 4; i++) {
+                kfree(p->inverse_translations[i]);
+                p->inverse_translations[i] = NULL;
+        }
+        if (p->inverse_trans_unicode) {
+                kfree(p->inverse_trans_unicode);
+                p->inverse_trans_unicode = NULL;
+        }
+}
+
+void con_free_unimap(struct vc_data *vc)
+{
+        struct uni_pagedir *p;
+
+        p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+        if (!p)
+                return;
+        *vc->vc_uni_pagedir_loc = 0;
+        if (--p->refcount)
+                return;
+        con_release_unimap(p);
+        kfree(p);
+}
+  
+static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p)
+{
+        int i, j, k;
+        struct uni_pagedir *q;
+        
+        for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                if (!vc_cons_allocated(i))
+                        continue;
+                q = (struct uni_pagedir *)*vc_cons[i].d->vc_uni_pagedir_loc;
+                if (!q || q == p || q->sum != p->sum)
+                        continue;
+                for (j = 0; j < 32; j++) {
+                        u16 **p1, **q1;
+                        p1 = p->uni_pgdir[j]; q1 = q->uni_pgdir[j];
+                        if (!p1 && !q1)
+                                continue;
+                        if (!p1 || !q1)
+                                break;
+                        for (k = 0; k < 32; k++) {
+                                if (!p1[k] && !q1[k])
+                                        continue;
+                                if (!p1[k] || !q1[k])
+                                        break;
+                                if (memcmp(p1[k], q1[k], 64*sizeof(u16)))
+                                        break;
+                        }
+                        if (k < 32)
+                                break;
+                }
+                if (j == 32) {
+                        q->refcount++;
+                        *conp->vc_uni_pagedir_loc = (unsigned long)q;
+                        con_release_unimap(p);
+                        kfree(p);
+                        return 1;
+                }
+        }
+        return 0;
+}
+
+static int
+con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos)
+{
+        int i, n;
+        u16 **p1, *p2;
+
+        if (!(p1 = p->uni_pgdir[n = unicode >> 11])) {
+                p1 = p->uni_pgdir[n] = kmalloc(32*sizeof(u16 *), GFP_KERNEL);
+                if (!p1) return -ENOMEM;
+                for (i = 0; i < 32; i++)
+                        p1[i] = NULL;
+        }
+
+        if (!(p2 = p1[n = (unicode >> 6) & 0x1f])) {
+                p2 = p1[n] = kmalloc(64*sizeof(u16), GFP_KERNEL);
+                if (!p2) return -ENOMEM;
+                memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */
+        }
+
+        p2[unicode & 0x3f] = fontpos;
+        
+        p->sum += (fontpos << 20) + unicode;
+
+        return 0;
+}
+
+/* ui is a leftover from using a hashtable, but might be used again */
+int con_clear_unimap(struct vc_data *vc, struct unimapinit *ui)
+{
+        struct uni_pagedir *p, *q;
+  
+        p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+        if (p && p->readonly) return -EIO;
+        if (!p || --p->refcount) {
+                q = kzalloc(sizeof(*p), GFP_KERNEL);
+                if (!q) {
+                        if (p) p->refcount++;
+                        return -ENOMEM;
+                }
+                q->refcount=1;
+                *vc->vc_uni_pagedir_loc = (unsigned long)q;
+        } else {
+                if (p == dflt) dflt = NULL;
+                p->refcount++;
+                p->sum = 0;
+                con_release_unimap(p);
+        }
+        return 0;
+}
+
+int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
+{
+        int err = 0, err1, i;
+        struct uni_pagedir *p, *q;
+
+        p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+        if (p->readonly) return -EIO;
+        
+        if (!ct) return 0;
+        
+        if (p->refcount > 1) {
+                int j, k;
+                u16 **p1, *p2, l;
+                
+                err1 = con_clear_unimap(vc, NULL);
+                if (err1) return err1;
+                
+                q = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+                for (i = 0, l = 0; i < 32; i++)
+                if ((p1 = p->uni_pgdir[i]))
+                        for (j = 0; j < 32; j++)
+                        if ((p2 = p1[j]))
+                                for (k = 0; k < 64; k++, l++)
+                                if (p2[k] != 0xffff) {
+                                        err1 = con_insert_unipair(q, l, p2[k]);
+                                        if (err1) {
+                                                p->refcount++;
+                                                *vc->vc_uni_pagedir_loc = (unsigned long)p;
+                                                con_release_unimap(q);
+                                                kfree(q);
+                                                return err1; 
+                                        }
+                                }
+                p = q;
+        } else if (p == dflt)
+                dflt = NULL;
+        
+        while (ct--) {
+                unsigned short unicode, fontpos;
+                __get_user(unicode, &list->unicode);
+                __get_user(fontpos, &list->fontpos);
+                if ((err1 = con_insert_unipair(p, unicode,fontpos)) != 0)
+                        err = err1;
+                list++;
+        }
+        
+        if (con_unify_unimap(vc, p))
+                return err;
+
+        for (i = 0; i <= 3; i++)
+                set_inverse_transl(vc, p, i); /* Update all inverse translations */
+        set_inverse_trans_unicode(vc, p);
+  
+        return err;
+}
+
+/* Loads the unimap for the hardware font, as defined in uni_hash.tbl.
+   The representation used was the most compact I could come up
+   with.  This routine is executed at sys_setup time, and when the
+   PIO_FONTRESET ioctl is called. */
+
+int con_set_default_unimap(struct vc_data *vc)
+{
+        int i, j, err = 0, err1;
+        u16 *q;
+        struct uni_pagedir *p;
+
+        if (dflt) {
+                p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+                if (p == dflt)
+                        return 0;
+                dflt->refcount++;
+                *vc->vc_uni_pagedir_loc = (unsigned long)dflt;
+                if (p && --p->refcount) {
+                        con_release_unimap(p);
+                        kfree(p);
+                }
+                return 0;
+        }
+        
+        /* The default font is always 256 characters */
+
+        err = con_clear_unimap(vc, NULL);
+        if (err) return err;
+    
+        p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+        q = dfont_unitable;
+        
+        for (i = 0; i < 256; i++)
+                for (j = dfont_unicount[i]; j; j--) {
+                        err1 = con_insert_unipair(p, *(q++), i);
+                        if (err1)
+                                err = err1;
+                }
+                        
+        if (con_unify_unimap(vc, p)) {
+                dflt = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+                return err;
+        }
+
+        for (i = 0; i <= 3; i++)
+                set_inverse_transl(vc, p, i);   /* Update all inverse translations */
+        set_inverse_trans_unicode(vc, p);
+        dflt = p;
+        return err;
+}
+EXPORT_SYMBOL(con_set_default_unimap);
+
+int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
+{
+        struct uni_pagedir *q;
+
+        if (!*src_vc->vc_uni_pagedir_loc)
+                return -EINVAL;
+        if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc)
+                return 0;
+        con_free_unimap(dst_vc);
+        q = (struct uni_pagedir *)*src_vc->vc_uni_pagedir_loc;
+        q->refcount++;
+        *dst_vc->vc_uni_pagedir_loc = (long)q;
+        return 0;
+}
+
+int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list)
+{
+        int i, j, k, ect;
+        u16 **p1, *p2;
+        struct uni_pagedir *p;
+
+        ect = 0;
+        if (*vc->vc_uni_pagedir_loc) {
+                p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+                for (i = 0; i < 32; i++)
+                if ((p1 = p->uni_pgdir[i]))
+                        for (j = 0; j < 32; j++)
+                        if ((p2 = *(p1++)))
+                                for (k = 0; k < 64; k++) {
+                                        if (*p2 < MAX_GLYPH && ect++ < ct) {
+                                                __put_user((u_short)((i<<11)+(j<<6)+k),
+                                                           &list->unicode);
+                                                __put_user((u_short) *p2, 
+                                                           &list->fontpos);
+                                                list++;
+                                        }
+                                        p2++;
+                                }
+        }
+        __put_user(ect, uct);
+        return ((ect <= ct) ? 0 : -ENOMEM);
+}
+
+void con_protect_unimap(struct vc_data *vc, int rdonly)
+{
+        struct uni_pagedir *p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+        
+        if (p)
+                p->readonly = rdonly;
+}
+
+/*
+ * Always use USER_MAP. These functions are used by the keyboard,
+ * which shouldn't be affected by G0/G1 switching, etc.
+ * If the user map still contains default values, i.e. the
+ * direct-to-font mapping, then assume user is using Latin1.
+ */
+/* may be called during an interrupt */
+u32 conv_8bit_to_uni(unsigned char c)
+{
+        unsigned short uni = translations[USER_MAP][c];
+        return uni == (0xf000 | c) ? c : uni;
+}
+
+int conv_uni_to_8bit(u32 uni)
+{
+        int c;
+        for (c = 0; c < 0x100; c++)
+                if (translations[USER_MAP][c] == uni ||
+                   (translations[USER_MAP][c] == (c | 0xf000) && uni == c))
+                        return c;
+        return -1;
+}
+
+int
+conv_uni_to_pc(struct vc_data *conp, long ucs) 
+{
+        int h;
+        u16 **p1, *p2;
+        struct uni_pagedir *p;
+  
+        /* Only 16-bit codes supported at this time */
+        if (ucs > 0xffff)
+                return -4;              /* Not found */
+        else if (ucs < 0x20)
+                return -1;              /* Not a printable character */
+        else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f))
+                return -2;                      /* Zero-width space */
+        /*
+         * UNI_DIRECT_BASE indicates the start of the region in the User Zone
+         * which always has a 1:1 mapping to the currently loaded font.  The
+         * UNI_DIRECT_MASK indicates the bit span of the region.
+         */
+        else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE)
+                return ucs & UNI_DIRECT_MASK;
+  
+        if (!*conp->vc_uni_pagedir_loc)
+                return -3;
+
+        p = (struct uni_pagedir *)*conp->vc_uni_pagedir_loc;  
+        if ((p1 = p->uni_pgdir[ucs >> 11]) &&
+            (p2 = p1[(ucs >> 6) & 0x1f]) &&
+            (h = p2[ucs & 0x3f]) < MAX_GLYPH)
+                return h;
+
+        return -4;              /* not found */
+}
+
+/*
+ * This is called at sys_setup time, after memory and the console are
+ * initialized.  It must be possible to call kmalloc(..., GFP_KERNEL)
+ * from this function, hence the call from sys_setup.
+ */
+void __init 
+console_map_init(void)
+{
+        int i;
+        
+        for (i = 0; i < MAX_NR_CONSOLES; i++)
+                if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc)
+                        con_set_default_unimap(vc_cons[i].d);
+}
+
+EXPORT_SYMBOL(con_copy_unimap);
diff --git a/drivers/tty/vt/cp437.uni b/drivers/tty/vt/cp437.uni
new file mode 100644
index 000000000000..bc6163484f62
--- /dev/null
+++ b/drivers/tty/vt/cp437.uni
@@ -0,0 +1,291 @@
+#
+# Unicode table for IBM Codepage 437.  Note that there are many more
+# substitutions that could be conceived (for example, thick-line
+# graphs probably should be replaced with double-line ones, accented
+# Latin characters should replaced with their nonaccented versions,
+# and some upper case Greek characters could be replaced by Latin), however,
+# I have limited myself to the Unicodes used by the kernel ISO 8859-1,
+# DEC VT, and IBM CP 437 tables.
+#
+# --------------------------------
+#
+# Basic IBM dingbats, some of which will never have a purpose clear
+# to mankind
+#
+0x00    U+0000
+0x01    U+263a
+0x02    U+263b
+0x03    U+2665
+0x04    U+2666 U+25c6
+0x05    U+2663
+0x06    U+2660
+0x07    U+2022
+0x08    U+25d8
+0x09    U+25cb
+0x0a    U+25d9
+0x0b    U+2642
+0x0c    U+2640
+0x0d    U+266a
+0x0e    U+266b
+0x0f    U+263c U+00a4
+0x10    U+25b6 U+25ba
+0x11    U+25c0 U+25c4
+0x12    U+2195
+0x13    U+203c
+0x14    U+00b6
+0x15    U+00a7
+0x16    U+25ac
+0x17    U+21a8
+0x18    U+2191
+0x19    U+2193
+0x1a    U+2192
+0x1b    U+2190
+0x1c    U+221f
+0x1d    U+2194
+0x1e    U+25b2
+0x1f    U+25bc
+#
+# The ASCII range is identity-mapped, but some of the characters also
+# have to act as substitutes, especially the upper-case characters.
+#
+0x20    U+0020
+0x21    U+0021
+0x22    U+0022 U+00a8
+0x23    U+0023
+0x24    U+0024
+0x25    U+0025
+0x26    U+0026
+0x27    U+0027 U+00b4
+0x28    U+0028
+0x29    U+0029
+0x2a    U+002a
+0x2b    U+002b
+0x2c    U+002c U+00b8
+0x2d    U+002d U+00ad
+0x2e    U+002e
+0x2f    U+002f
+0x30    U+0030
+0x31    U+0031
+0x32    U+0032
+0x33    U+0033
+0x34    U+0034
+0x35    U+0035
+0x36    U+0036
+0x37    U+0037
+0x38    U+0038
+0x39    U+0039
+0x3a    U+003a
+0x3b    U+003b
+0x3c    U+003c
+0x3d    U+003d
+0x3e    U+003e
+0x3f    U+003f
+0x40    U+0040
+0x41    U+0041 U+00c0 U+00c1 U+00c2 U+00c3
+0x42    U+0042
+0x43    U+0043 U+00a9
+0x44    U+0044 U+00d0
+0x45    U+0045 U+00c8 U+00ca U+00cb
+0x46    U+0046
+0x47    U+0047
+0x48    U+0048
+0x49    U+0049 U+00cc U+00cd U+00ce U+00cf
+0x4a    U+004a
+0x4b    U+004b U+212a
+0x4c    U+004c
+0x4d    U+004d
+0x4e    U+004e
+0x4f    U+004f U+00d2 U+00d3 U+00d4 U+00d5
+0x50    U+0050
+0x51    U+0051
+0x52    U+0052 U+00ae
+0x53    U+0053
+0x54    U+0054
+0x55    U+0055 U+00d9 U+00da U+00db
+0x56    U+0056
+0x57    U+0057
+0x58    U+0058
+0x59    U+0059 U+00dd
+0x5a    U+005a
+0x5b    U+005b
+0x5c    U+005c
+0x5d    U+005d
+0x5e    U+005e
+0x5f    U+005f U+23bd U+f804
+0x60    U+0060
+0x61    U+0061 U+00e3
+0x62    U+0062
+0x63    U+0063
+0x64    U+0064
+0x65    U+0065
+0x66    U+0066
+0x67    U+0067
+0x68    U+0068
+0x69    U+0069
+0x6a    U+006a
+0x6b    U+006b
+0x6c    U+006c
+0x6d    U+006d
+0x6e    U+006e
+0x6f    U+006f U+00f5
+0x70    U+0070
+0x71    U+0071
+0x72    U+0072
+0x73    U+0073
+0x74    U+0074
+0x75    U+0075
+0x76    U+0076
+0x77    U+0077
+0x78    U+0078 U+00d7
+0x79    U+0079 U+00fd
+0x7a    U+007a
+0x7b    U+007b
+0x7c    U+007c U+00a6
+0x7d    U+007d
+0x7e    U+007e
+#
+# Okay, what on Earth is this one supposed to be used for?
+#
+0x7f    U+2302
+#
+# Non-English characters, mostly lower case letters...
+#
+0x80    U+00c7
+0x81    U+00fc
+0x82    U+00e9
+0x83    U+00e2
+0x84    U+00e4
+0x85    U+00e0
+0x86    U+00e5
+0x87    U+00e7
+0x88    U+00ea
+0x89    U+00eb
+0x8a    U+00e8
+0x8b    U+00ef
+0x8c    U+00ee
+0x8d    U+00ec
+0x8e    U+00c4
+0x8f    U+00c5 U+212b
+0x90    U+00c9
+0x91    U+00e6
+0x92    U+00c6
+0x93    U+00f4
+0x94    U+00f6
+0x95    U+00f2
+0x96    U+00fb
+0x97    U+00f9
+0x98    U+00ff
+0x99    U+00d6
+0x9a    U+00dc
+0x9b    U+00a2
+0x9c    U+00a3
+0x9d    U+00a5
+0x9e    U+20a7
+0x9f    U+0192
+0xa0    U+00e1
+0xa1    U+00ed
+0xa2    U+00f3
+0xa3    U+00fa
+0xa4    U+00f1
+0xa5    U+00d1
+0xa6    U+00aa
+0xa7    U+00ba
+0xa8    U+00bf
+0xa9    U+2310
+0xaa    U+00ac
+0xab    U+00bd
+0xac    U+00bc
+0xad    U+00a1
+0xae    U+00ab
+0xaf    U+00bb
+#
+# Block graphics
+#
+0xb0    U+2591
+0xb1    U+2592
+0xb2    U+2593
+0xb3    U+2502
+0xb4    U+2524
+0xb5    U+2561
+0xb6    U+2562
+0xb7    U+2556
+0xb8    U+2555
+0xb9    U+2563
+0xba    U+2551
+0xbb    U+2557
+0xbc    U+255d
+0xbd    U+255c
+0xbe    U+255b
+0xbf    U+2510
+0xc0    U+2514
+0xc1    U+2534
+0xc2    U+252c
+0xc3    U+251c
+0xc4    U+2500
+0xc5    U+253c
+0xc6    U+255e
+0xc7    U+255f
+0xc8    U+255a
+0xc9    U+2554
+0xca    U+2569
+0xcb    U+2566
+0xcc    U+2560
+0xcd    U+2550
+0xce    U+256c
+0xcf    U+2567
+0xd0    U+2568
+0xd1    U+2564
+0xd2    U+2565
+0xd3    U+2559
+0xd4    U+2558
+0xd5    U+2552
+0xd6    U+2553
+0xd7    U+256b
+0xd8    U+256a
+0xd9    U+2518
+0xda    U+250c
+0xdb    U+2588
+0xdc    U+2584
+0xdd    U+258c
+0xde    U+2590
+0xdf    U+2580
+#
+# Greek letters and mathematical symbols
+#
+0xe0    U+03b1
+0xe1    U+03b2 U+00df
+0xe2    U+0393
+0xe3    U+03c0
+0xe4    U+03a3
+0xe5    U+03c3
+0xe6    U+00b5 U+03bc
+0xe7    U+03c4
+0xe8    U+03a6 U+00d8
+0xe9    U+0398
+0xea    U+03a9 U+2126
+0xeb    U+03b4 U+00f0
+0xec    U+221e
+0xed    U+03c6 U+00f8
+0xee    U+03b5 U+2208
+0xef    U+2229
+0xf0    U+2261
+0xf1    U+00b1
+0xf2    U+2265
+0xf3    U+2264
+0xf4    U+2320
+0xf5    U+2321
+0xf6    U+00f7
+0xf7    U+2248
+0xf8    U+00b0
+0xf9    U+2219
+0xfa    U+00b7
+0xfb    U+221a
+0xfc    U+207f
+0xfd    U+00b2
+#
+# Square bullet, non-spacing blank
+# Mapping U+fffd to the square bullet means it is the substitution
+# character
+# 
+0xfe    U+25a0 U+fffd
+0xff    U+00a0
diff --git a/drivers/tty/vt/defkeymap.c_shipped b/drivers/tty/vt/defkeymap.c_shipped
new file mode 100644
index 000000000000..d2208dfe3f67
--- /dev/null
+++ b/drivers/tty/vt/defkeymap.c_shipped
@@ -0,0 +1,262 @@
+/* Do not edit this file! It was automatically generated by   */
+/*    loadkeys --mktable defkeymap.map > defkeymap.c          */
+
+#include <linux/types.h>
+#include <linux/keyboard.h>
+#include <linux/kd.h>
+
+u_short plain_map[NR_KEYS] = {
+        0xf200, 0xf01b, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036,
+        0xf037, 0xf038, 0xf039, 0xf030, 0xf02d, 0xf03d, 0xf07f, 0xf009,
+        0xfb71, 0xfb77, 0xfb65, 0xfb72, 0xfb74, 0xfb79, 0xfb75, 0xfb69,
+        0xfb6f, 0xfb70, 0xf05b, 0xf05d, 0xf201, 0xf702, 0xfb61, 0xfb73,
+        0xfb64, 0xfb66, 0xfb67, 0xfb68, 0xfb6a, 0xfb6b, 0xfb6c, 0xf03b,
+        0xf027, 0xf060, 0xf700, 0xf05c, 0xfb7a, 0xfb78, 0xfb63, 0xfb76,
+        0xfb62, 0xfb6e, 0xfb6d, 0xf02c, 0xf02e, 0xf02f, 0xf700, 0xf30c,
+        0xf703, 0xf020, 0xf207, 0xf100, 0xf101, 0xf102, 0xf103, 0xf104,
+        0xf105, 0xf106, 0xf107, 0xf108, 0xf109, 0xf208, 0xf209, 0xf307,
+        0xf308, 0xf309, 0xf30b, 0xf304, 0xf305, 0xf306, 0xf30a, 0xf301,
+        0xf302, 0xf303, 0xf300, 0xf310, 0xf206, 0xf200, 0xf03c, 0xf10a,
+        0xf10b, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf30e, 0xf702, 0xf30d, 0xf01c, 0xf701, 0xf205, 0xf114, 0xf603,
+        0xf118, 0xf601, 0xf602, 0xf117, 0xf600, 0xf119, 0xf115, 0xf116,
+        0xf11a, 0xf10c, 0xf10d, 0xf11b, 0xf11c, 0xf110, 0xf311, 0xf11d,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+};
+
+u_short shift_map[NR_KEYS] = {
+        0xf200, 0xf01b, 0xf021, 0xf040, 0xf023, 0xf024, 0xf025, 0xf05e,
+        0xf026, 0xf02a, 0xf028, 0xf029, 0xf05f, 0xf02b, 0xf07f, 0xf009,
+        0xfb51, 0xfb57, 0xfb45, 0xfb52, 0xfb54, 0xfb59, 0xfb55, 0xfb49,
+        0xfb4f, 0xfb50, 0xf07b, 0xf07d, 0xf201, 0xf702, 0xfb41, 0xfb53,
+        0xfb44, 0xfb46, 0xfb47, 0xfb48, 0xfb4a, 0xfb4b, 0xfb4c, 0xf03a,
+        0xf022, 0xf07e, 0xf700, 0xf07c, 0xfb5a, 0xfb58, 0xfb43, 0xfb56,
+        0xfb42, 0xfb4e, 0xfb4d, 0xf03c, 0xf03e, 0xf03f, 0xf700, 0xf30c,
+        0xf703, 0xf020, 0xf207, 0xf10a, 0xf10b, 0xf10c, 0xf10d, 0xf10e,
+        0xf10f, 0xf110, 0xf111, 0xf112, 0xf113, 0xf213, 0xf203, 0xf307,
+        0xf308, 0xf309, 0xf30b, 0xf304, 0xf305, 0xf306, 0xf30a, 0xf301,
+        0xf302, 0xf303, 0xf300, 0xf310, 0xf206, 0xf200, 0xf03e, 0xf10a,
+        0xf10b, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf30e, 0xf702, 0xf30d, 0xf200, 0xf701, 0xf205, 0xf114, 0xf603,
+        0xf20b, 0xf601, 0xf602, 0xf117, 0xf600, 0xf20a, 0xf115, 0xf116,
+        0xf11a, 0xf10c, 0xf10d, 0xf11b, 0xf11c, 0xf110, 0xf311, 0xf11d,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+};
+
+u_short altgr_map[NR_KEYS] = {
+        0xf200, 0xf200, 0xf200, 0xf040, 0xf200, 0xf024, 0xf200, 0xf200,
+        0xf07b, 0xf05b, 0xf05d, 0xf07d, 0xf05c, 0xf200, 0xf200, 0xf200,
+        0xfb71, 0xfb77, 0xf918, 0xfb72, 0xfb74, 0xfb79, 0xfb75, 0xfb69,
+        0xfb6f, 0xfb70, 0xf200, 0xf07e, 0xf201, 0xf702, 0xf914, 0xfb73,
+        0xf917, 0xf919, 0xfb67, 0xfb68, 0xfb6a, 0xfb6b, 0xfb6c, 0xf200,
+        0xf200, 0xf200, 0xf700, 0xf200, 0xfb7a, 0xfb78, 0xf916, 0xfb76,
+        0xf915, 0xfb6e, 0xfb6d, 0xf200, 0xf200, 0xf200, 0xf700, 0xf30c,
+        0xf703, 0xf200, 0xf207, 0xf50c, 0xf50d, 0xf50e, 0xf50f, 0xf510,
+        0xf511, 0xf512, 0xf513, 0xf514, 0xf515, 0xf208, 0xf202, 0xf911,
+        0xf912, 0xf913, 0xf30b, 0xf90e, 0xf90f, 0xf910, 0xf30a, 0xf90b,
+        0xf90c, 0xf90d, 0xf90a, 0xf310, 0xf206, 0xf200, 0xf07c, 0xf516,
+        0xf517, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf30e, 0xf702, 0xf30d, 0xf200, 0xf701, 0xf205, 0xf114, 0xf603,
+        0xf118, 0xf601, 0xf602, 0xf117, 0xf600, 0xf119, 0xf115, 0xf116,
+        0xf11a, 0xf10c, 0xf10d, 0xf11b, 0xf11c, 0xf110, 0xf311, 0xf11d,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+};
+
+u_short ctrl_map[NR_KEYS] = {
+        0xf200, 0xf200, 0xf200, 0xf000, 0xf01b, 0xf01c, 0xf01d, 0xf01e,
+        0xf01f, 0xf07f, 0xf200, 0xf200, 0xf01f, 0xf200, 0xf008, 0xf200,
+        0xf011, 0xf017, 0xf005, 0xf012, 0xf014, 0xf019, 0xf015, 0xf009,
+        0xf00f, 0xf010, 0xf01b, 0xf01d, 0xf201, 0xf702, 0xf001, 0xf013,
+        0xf004, 0xf006, 0xf007, 0xf008, 0xf00a, 0xf00b, 0xf00c, 0xf200,
+        0xf007, 0xf000, 0xf700, 0xf01c, 0xf01a, 0xf018, 0xf003, 0xf016,
+        0xf002, 0xf00e, 0xf00d, 0xf200, 0xf20e, 0xf07f, 0xf700, 0xf30c,
+        0xf703, 0xf000, 0xf207, 0xf100, 0xf101, 0xf102, 0xf103, 0xf104,
+        0xf105, 0xf106, 0xf107, 0xf108, 0xf109, 0xf208, 0xf204, 0xf307,
+        0xf308, 0xf309, 0xf30b, 0xf304, 0xf305, 0xf306, 0xf30a, 0xf301,
+        0xf302, 0xf303, 0xf300, 0xf310, 0xf206, 0xf200, 0xf200, 0xf10a,
+        0xf10b, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf30e, 0xf702, 0xf30d, 0xf01c, 0xf701, 0xf205, 0xf114, 0xf603,
+        0xf118, 0xf601, 0xf602, 0xf117, 0xf600, 0xf119, 0xf115, 0xf116,
+        0xf11a, 0xf10c, 0xf10d, 0xf11b, 0xf11c, 0xf110, 0xf311, 0xf11d,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+};
+
+u_short shift_ctrl_map[NR_KEYS] = {
+        0xf200, 0xf200, 0xf200, 0xf000, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf01f, 0xf200, 0xf200, 0xf200,
+        0xf011, 0xf017, 0xf005, 0xf012, 0xf014, 0xf019, 0xf015, 0xf009,
+        0xf00f, 0xf010, 0xf200, 0xf200, 0xf201, 0xf702, 0xf001, 0xf013,
+        0xf004, 0xf006, 0xf007, 0xf008, 0xf00a, 0xf00b, 0xf00c, 0xf200,
+        0xf200, 0xf200, 0xf700, 0xf200, 0xf01a, 0xf018, 0xf003, 0xf016,
+        0xf002, 0xf00e, 0xf00d, 0xf200, 0xf200, 0xf200, 0xf700, 0xf30c,
+        0xf703, 0xf200, 0xf207, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf208, 0xf200, 0xf307,
+        0xf308, 0xf309, 0xf30b, 0xf304, 0xf305, 0xf306, 0xf30a, 0xf301,
+        0xf302, 0xf303, 0xf300, 0xf310, 0xf206, 0xf200, 0xf200, 0xf200,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf30e, 0xf702, 0xf30d, 0xf200, 0xf701, 0xf205, 0xf114, 0xf603,
+        0xf118, 0xf601, 0xf602, 0xf117, 0xf600, 0xf119, 0xf115, 0xf116,
+        0xf11a, 0xf10c, 0xf10d, 0xf11b, 0xf11c, 0xf110, 0xf311, 0xf11d,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+};
+
+u_short alt_map[NR_KEYS] = {
+        0xf200, 0xf81b, 0xf831, 0xf832, 0xf833, 0xf834, 0xf835, 0xf836,
+        0xf837, 0xf838, 0xf839, 0xf830, 0xf82d, 0xf83d, 0xf87f, 0xf809,
+        0xf871, 0xf877, 0xf865, 0xf872, 0xf874, 0xf879, 0xf875, 0xf869,
+        0xf86f, 0xf870, 0xf85b, 0xf85d, 0xf80d, 0xf702, 0xf861, 0xf873,
+        0xf864, 0xf866, 0xf867, 0xf868, 0xf86a, 0xf86b, 0xf86c, 0xf83b,
+        0xf827, 0xf860, 0xf700, 0xf85c, 0xf87a, 0xf878, 0xf863, 0xf876,
+        0xf862, 0xf86e, 0xf86d, 0xf82c, 0xf82e, 0xf82f, 0xf700, 0xf30c,
+        0xf703, 0xf820, 0xf207, 0xf500, 0xf501, 0xf502, 0xf503, 0xf504,
+        0xf505, 0xf506, 0xf507, 0xf508, 0xf509, 0xf208, 0xf209, 0xf907,
+        0xf908, 0xf909, 0xf30b, 0xf904, 0xf905, 0xf906, 0xf30a, 0xf901,
+        0xf902, 0xf903, 0xf900, 0xf310, 0xf206, 0xf200, 0xf83c, 0xf50a,
+        0xf50b, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf30e, 0xf702, 0xf30d, 0xf01c, 0xf701, 0xf205, 0xf114, 0xf603,
+        0xf118, 0xf210, 0xf211, 0xf117, 0xf600, 0xf119, 0xf115, 0xf116,
+        0xf11a, 0xf10c, 0xf10d, 0xf11b, 0xf11c, 0xf110, 0xf311, 0xf11d,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+};
+
+u_short ctrl_alt_map[NR_KEYS] = {
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf811, 0xf817, 0xf805, 0xf812, 0xf814, 0xf819, 0xf815, 0xf809,
+        0xf80f, 0xf810, 0xf200, 0xf200, 0xf201, 0xf702, 0xf801, 0xf813,
+        0xf804, 0xf806, 0xf807, 0xf808, 0xf80a, 0xf80b, 0xf80c, 0xf200,
+        0xf200, 0xf200, 0xf700, 0xf200, 0xf81a, 0xf818, 0xf803, 0xf816,
+        0xf802, 0xf80e, 0xf80d, 0xf200, 0xf200, 0xf200, 0xf700, 0xf30c,
+        0xf703, 0xf200, 0xf207, 0xf500, 0xf501, 0xf502, 0xf503, 0xf504,
+        0xf505, 0xf506, 0xf507, 0xf508, 0xf509, 0xf208, 0xf200, 0xf307,
+        0xf308, 0xf309, 0xf30b, 0xf304, 0xf305, 0xf306, 0xf30a, 0xf301,
+        0xf302, 0xf303, 0xf300, 0xf20c, 0xf206, 0xf200, 0xf200, 0xf50a,
+        0xf50b, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+        0xf30e, 0xf702, 0xf30d, 0xf200, 0xf701, 0xf205, 0xf114, 0xf603,
+        0xf118, 0xf601, 0xf602, 0xf117, 0xf600, 0xf119, 0xf115, 0xf20c,
+        0xf11a, 0xf10c, 0xf10d, 0xf11b, 0xf11c, 0xf110, 0xf311, 0xf11d,
+        0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200, 0xf200,
+};
+
+ushort *key_maps[MAX_NR_KEYMAPS] = {
+        plain_map, shift_map, altgr_map, NULL,
+        ctrl_map, shift_ctrl_map, NULL, NULL,
+        alt_map, NULL, NULL, NULL,
+        ctrl_alt_map, NULL
+};
+
+unsigned int keymap_count = 7;
+
+/*
+ * Philosophy: most people do not define more strings, but they who do
+ * often want quite a lot of string space. So, we statically allocate
+ * the default and allocate dynamically in chunks of 512 bytes.
+ */
+
+char func_buf[] = {
+        '\033', '[', '[', 'A', 0, 
+        '\033', '[', '[', 'B', 0, 
+        '\033', '[', '[', 'C', 0, 
+        '\033', '[', '[', 'D', 0, 
+        '\033', '[', '[', 'E', 0, 
+        '\033', '[', '1', '7', '~', 0, 
+        '\033', '[', '1', '8', '~', 0, 
+        '\033', '[', '1', '9', '~', 0, 
+        '\033', '[', '2', '0', '~', 0, 
+        '\033', '[', '2', '1', '~', 0, 
+        '\033', '[', '2', '3', '~', 0, 
+        '\033', '[', '2', '4', '~', 0, 
+        '\033', '[', '2', '5', '~', 0, 
+        '\033', '[', '2', '6', '~', 0, 
+        '\033', '[', '2', '8', '~', 0, 
+        '\033', '[', '2', '9', '~', 0, 
+        '\033', '[', '3', '1', '~', 0, 
+        '\033', '[', '3', '2', '~', 0, 
+        '\033', '[', '3', '3', '~', 0, 
+        '\033', '[', '3', '4', '~', 0, 
+        '\033', '[', '1', '~', 0, 
+        '\033', '[', '2', '~', 0, 
+        '\033', '[', '3', '~', 0, 
+        '\033', '[', '4', '~', 0, 
+        '\033', '[', '5', '~', 0, 
+        '\033', '[', '6', '~', 0, 
+        '\033', '[', 'M', 0, 
+        '\033', '[', 'P', 0, 
+};
+
+char *funcbufptr = func_buf;
+int funcbufsize = sizeof(func_buf);
+int funcbufleft = 0;          /* space left */
+
+char *func_table[MAX_NR_FUNC] = {
+        func_buf + 0,
+        func_buf + 5,
+        func_buf + 10,
+        func_buf + 15,
+        func_buf + 20,
+        func_buf + 25,
+        func_buf + 31,
+        func_buf + 37,
+        func_buf + 43,
+        func_buf + 49,
+        func_buf + 55,
+        func_buf + 61,
+        func_buf + 67,
+        func_buf + 73,
+        func_buf + 79,
+        func_buf + 85,
+        func_buf + 91,
+        func_buf + 97,
+        func_buf + 103,
+        func_buf + 109,
+        func_buf + 115,
+        func_buf + 120,
+        func_buf + 125,
+        func_buf + 130,
+        func_buf + 135,
+        func_buf + 140,
+        func_buf + 145,
+        NULL,
+        NULL,
+        func_buf + 149,
+        NULL,
+};
+
+struct kbdiacruc accent_table[MAX_DIACR] = {
+        {'`', 'A', 0300},       {'`', 'a', 0340},
+        {'\'', 'A', 0301},      {'\'', 'a', 0341},
+        {'^', 'A', 0302},       {'^', 'a', 0342},
+        {'~', 'A', 0303},       {'~', 'a', 0343},
+        {'"', 'A', 0304},       {'"', 'a', 0344},
+        {'O', 'A', 0305},       {'o', 'a', 0345},
+        {'0', 'A', 0305},       {'0', 'a', 0345},
+        {'A', 'A', 0305},       {'a', 'a', 0345},
+        {'A', 'E', 0306},       {'a', 'e', 0346},
+        {',', 'C', 0307},       {',', 'c', 0347},
+        {'`', 'E', 0310},       {'`', 'e', 0350},
+        {'\'', 'E', 0311},      {'\'', 'e', 0351},
+        {'^', 'E', 0312},       {'^', 'e', 0352},
+        {'"', 'E', 0313},       {'"', 'e', 0353},
+        {'`', 'I', 0314},       {'`', 'i', 0354},
+        {'\'', 'I', 0315},      {'\'', 'i', 0355},
+        {'^', 'I', 0316},       {'^', 'i', 0356},
+        {'"', 'I', 0317},       {'"', 'i', 0357},
+        {'-', 'D', 0320},       {'-', 'd', 0360},
+        {'~', 'N', 0321},       {'~', 'n', 0361},
+        {'`', 'O', 0322},       {'`', 'o', 0362},
+        {'\'', 'O', 0323},      {'\'', 'o', 0363},
+        {'^', 'O', 0324},       {'^', 'o', 0364},
+        {'~', 'O', 0325},       {'~', 'o', 0365},
+        {'"', 'O', 0326},       {'"', 'o', 0366},
+        {'/', 'O', 0330},       {'/', 'o', 0370},
+        {'`', 'U', 0331},       {'`', 'u', 0371},
+        {'\'', 'U', 0332},      {'\'', 'u', 0372},
+        {'^', 'U', 0333},       {'^', 'u', 0373},
+        {'"', 'U', 0334},       {'"', 'u', 0374},
+        {'\'', 'Y', 0335},      {'\'', 'y', 0375},
+        {'T', 'H', 0336},       {'t', 'h', 0376},
+        {'s', 's', 0337},       {'"', 'y', 0377},
+        {'s', 'z', 0337},       {'i', 'j', 0377},
+};
+
+unsigned int accent_table_size = 68;
diff --git a/drivers/tty/vt/defkeymap.map b/drivers/tty/vt/defkeymap.map
new file mode 100644
index 000000000000..50b30cace261
--- /dev/null
+++ b/drivers/tty/vt/defkeymap.map
@@ -0,0 +1,357 @@
+# Default kernel keymap. This uses 7 modifier combinations.
+keymaps 0-2,4-5,8,12
+# Change the above line into
+#       keymaps 0-2,4-6,8,12
+# in case you want the entries
+#       altgr   control keycode  83 = Boot            
+#       altgr   control keycode 111 = Boot            
+# below.
+#
+# In fact AltGr is used very little, and one more keymap can
+# be saved by mapping AltGr to Alt (and adapting a few entries):
+# keycode 100 = Alt
+#
+keycode   1 = Escape           Escape          
+        alt     keycode   1 = Meta_Escape     
+keycode   2 = one              exclam          
+        alt     keycode   2 = Meta_one        
+keycode   3 = two              at               at              
+        control keycode   3 = nul             
+        shift   control keycode   3 = nul             
+        alt     keycode   3 = Meta_two        
+keycode   4 = three            numbersign      
+        control keycode   4 = Escape          
+        alt     keycode   4 = Meta_three      
+keycode   5 = four             dollar           dollar          
+        control keycode   5 = Control_backslash
+        alt     keycode   5 = Meta_four       
+keycode   6 = five             percent         
+        control keycode   6 = Control_bracketright
+        alt     keycode   6 = Meta_five       
+keycode   7 = six              asciicircum     
+        control keycode   7 = Control_asciicircum
+        alt     keycode   7 = Meta_six        
+keycode   8 = seven            ampersand        braceleft       
+        control keycode   8 = Control_underscore
+        alt     keycode   8 = Meta_seven      
+keycode   9 = eight            asterisk         bracketleft     
+        control keycode   9 = Delete          
+        alt     keycode   9 = Meta_eight      
+keycode  10 = nine             parenleft        bracketright    
+        alt     keycode  10 = Meta_nine       
+keycode  11 = zero             parenright       braceright      
+        alt     keycode  11 = Meta_zero       
+keycode  12 = minus            underscore       backslash       
+        control keycode  12 = Control_underscore
+        shift   control keycode  12 = Control_underscore
+        alt     keycode  12 = Meta_minus      
+keycode  13 = equal            plus            
+        alt     keycode  13 = Meta_equal      
+keycode  14 = Delete           Delete          
+        control keycode  14 = BackSpace
+        alt     keycode  14 = Meta_Delete     
+keycode  15 = Tab              Tab             
+        alt     keycode  15 = Meta_Tab        
+keycode  16 = q               
+keycode  17 = w               
+keycode  18 = e
+        altgr   keycode  18 = Hex_E   
+keycode  19 = r               
+keycode  20 = t               
+keycode  21 = y               
+keycode  22 = u               
+keycode  23 = i               
+keycode  24 = o               
+keycode  25 = p               
+keycode  26 = bracketleft      braceleft       
+        control keycode  26 = Escape          
+        alt     keycode  26 = Meta_bracketleft
+keycode  27 = bracketright     braceright       asciitilde      
+        control keycode  27 = Control_bracketright
+        alt     keycode  27 = Meta_bracketright
+keycode  28 = Return          
+        alt     keycode  28 = Meta_Control_m  
+keycode  29 = Control         
+keycode  30 = a
+        altgr   keycode  30 = Hex_A
+keycode  31 = s               
+keycode  32 = d
+        altgr   keycode  32 = Hex_D   
+keycode  33 = f
+        altgr   keycode  33 = Hex_F               
+keycode  34 = g               
+keycode  35 = h               
+keycode  36 = j               
+keycode  37 = k               
+keycode  38 = l               
+keycode  39 = semicolon        colon           
+        alt     keycode  39 = Meta_semicolon  
+keycode  40 = apostrophe       quotedbl        
+        control keycode  40 = Control_g       
+        alt     keycode  40 = Meta_apostrophe 
+keycode  41 = grave            asciitilde      
+        control keycode  41 = nul             
+        alt     keycode  41 = Meta_grave      
+keycode  42 = Shift           
+keycode  43 = backslash        bar             
+        control keycode  43 = Control_backslash
+        alt     keycode  43 = Meta_backslash  
+keycode  44 = z               
+keycode  45 = x               
+keycode  46 = c
+        altgr   keycode  46 = Hex_C   
+keycode  47 = v               
+keycode  48 = b
+        altgr   keycode  48 = Hex_B
+keycode  49 = n               
+keycode  50 = m               
+keycode  51 = comma            less            
+        alt     keycode  51 = Meta_comma      
+keycode  52 = period           greater         
+        control keycode  52 = Compose         
+        alt     keycode  52 = Meta_period     
+keycode  53 = slash            question        
+        control keycode  53 = Delete          
+        alt     keycode  53 = Meta_slash      
+keycode  54 = Shift           
+keycode  55 = KP_Multiply     
+keycode  56 = Alt             
+keycode  57 = space            space           
+        control keycode  57 = nul             
+        alt     keycode  57 = Meta_space      
+keycode  58 = Caps_Lock       
+keycode  59 = F1               F11              Console_13      
+        control keycode  59 = F1              
+        alt     keycode  59 = Console_1       
+        control alt     keycode  59 = Console_1       
+keycode  60 = F2               F12              Console_14      
+        control keycode  60 = F2              
+        alt     keycode  60 = Console_2       
+        control alt     keycode  60 = Console_2       
+keycode  61 = F3               F13              Console_15      
+        control keycode  61 = F3              
+        alt     keycode  61 = Console_3       
+        control alt     keycode  61 = Console_3       
+keycode  62 = F4               F14              Console_16      
+        control keycode  62 = F4              
+        alt     keycode  62 = Console_4       
+        control alt     keycode  62 = Console_4       
+keycode  63 = F5               F15              Console_17      
+        control keycode  63 = F5              
+        alt     keycode  63 = Console_5       
+        control alt     keycode  63 = Console_5       
+keycode  64 = F6               F16              Console_18      
+        control keycode  64 = F6              
+        alt     keycode  64 = Console_6       
+        control alt     keycode  64 = Console_6       
+keycode  65 = F7               F17              Console_19      
+        control keycode  65 = F7              
+        alt     keycode  65 = Console_7       
+        control alt     keycode  65 = Console_7       
+keycode  66 = F8               F18              Console_20      
+        control keycode  66 = F8              
+        alt     keycode  66 = Console_8       
+        control alt     keycode  66 = Console_8       
+keycode  67 = F9               F19              Console_21      
+        control keycode  67 = F9              
+        alt     keycode  67 = Console_9       
+        control alt     keycode  67 = Console_9       
+keycode  68 = F10              F20              Console_22      
+        control keycode  68 = F10             
+        alt     keycode  68 = Console_10      
+        control alt     keycode  68 = Console_10      
+keycode  69 = Num_Lock
+        shift   keycode  69 = Bare_Num_Lock
+keycode  70 = Scroll_Lock      Show_Memory      Show_Registers  
+        control keycode  70 = Show_State      
+        alt     keycode  70 = Scroll_Lock     
+keycode  71 = KP_7            
+        alt     keycode  71 = Ascii_7         
+        altgr   keycode  71 = Hex_7         
+keycode  72 = KP_8            
+        alt     keycode  72 = Ascii_8         
+        altgr   keycode  72 = Hex_8         
+keycode  73 = KP_9            
+        alt     keycode  73 = Ascii_9         
+        altgr   keycode  73 = Hex_9         
+keycode  74 = KP_Subtract     
+keycode  75 = KP_4            
+        alt     keycode  75 = Ascii_4         
+        altgr   keycode  75 = Hex_4         
+keycode  76 = KP_5            
+        alt     keycode  76 = Ascii_5         
+        altgr   keycode  76 = Hex_5         
+keycode  77 = KP_6            
+        alt     keycode  77 = Ascii_6         
+        altgr   keycode  77 = Hex_6         
+keycode  78 = KP_Add          
+keycode  79 = KP_1            
+        alt     keycode  79 = Ascii_1         
+        altgr   keycode  79 = Hex_1         
+keycode  80 = KP_2            
+        alt     keycode  80 = Ascii_2         
+        altgr   keycode  80 = Hex_2         
+keycode  81 = KP_3            
+        alt     keycode  81 = Ascii_3         
+        altgr   keycode  81 = Hex_3         
+keycode  82 = KP_0            
+        alt     keycode  82 = Ascii_0         
+        altgr   keycode  82 = Hex_0         
+keycode  83 = KP_Period       
+#       altgr   control keycode  83 = Boot            
+        control alt     keycode  83 = Boot            
+keycode  84 = Last_Console    
+keycode  85 =
+keycode  86 = less             greater          bar             
+        alt     keycode  86 = Meta_less       
+keycode  87 = F11              F11              Console_23      
+        control keycode  87 = F11             
+        alt     keycode  87 = Console_11      
+        control alt     keycode  87 = Console_11      
+keycode  88 = F12              F12              Console_24      
+        control keycode  88 = F12             
+        alt     keycode  88 = Console_12      
+        control alt     keycode  88 = Console_12      
+keycode  89 =
+keycode  90 =
+keycode  91 =
+keycode  92 =
+keycode  93 =
+keycode  94 =
+keycode  95 =
+keycode  96 = KP_Enter        
+keycode  97 = Control         
+keycode  98 = KP_Divide       
+keycode  99 = Control_backslash
+        control keycode  99 = Control_backslash
+        alt     keycode  99 = Control_backslash
+keycode 100 = AltGr           
+keycode 101 = Break           
+keycode 102 = Find            
+keycode 103 = Up              
+keycode 104 = Prior           
+        shift   keycode 104 = Scroll_Backward 
+keycode 105 = Left            
+        alt     keycode 105 = Decr_Console
+keycode 106 = Right           
+        alt     keycode 106 = Incr_Console
+keycode 107 = Select          
+keycode 108 = Down            
+keycode 109 = Next            
+        shift   keycode 109 = Scroll_Forward  
+keycode 110 = Insert          
+keycode 111 = Remove          
+#       altgr   control keycode 111 = Boot            
+        control alt     keycode 111 = Boot            
+keycode 112 = Macro           
+keycode 113 = F13             
+keycode 114 = F14             
+keycode 115 = Help            
+keycode 116 = Do              
+keycode 117 = F17             
+keycode 118 = KP_MinPlus      
+keycode 119 = Pause           
+keycode 120 =
+keycode 121 =
+keycode 122 =
+keycode 123 =
+keycode 124 =
+keycode 125 =
+keycode 126 =
+keycode 127 =
+string F1 = "\033[[A"
+string F2 = "\033[[B"
+string F3 = "\033[[C"
+string F4 = "\033[[D"
+string F5 = "\033[[E"
+string F6 = "\033[17~"
+string F7 = "\033[18~"
+string F8 = "\033[19~"
+string F9 = "\033[20~"
+string F10 = "\033[21~"
+string F11 = "\033[23~"
+string F12 = "\033[24~"
+string F13 = "\033[25~"
+string F14 = "\033[26~"
+string F15 = "\033[28~"
+string F16 = "\033[29~"
+string F17 = "\033[31~"
+string F18 = "\033[32~"
+string F19 = "\033[33~"
+string F20 = "\033[34~"
+string Find = "\033[1~"
+string Insert = "\033[2~"
+string Remove = "\033[3~"
+string Select = "\033[4~"
+string Prior = "\033[5~"
+string Next = "\033[6~"
+string Macro = "\033[M"
+string Pause = "\033[P"
+compose '`' 'A' to 'À'
+compose '`' 'a' to 'à'
+compose '\'' 'A' to 'Á'
+compose '\'' 'a' to 'á'
+compose '^' 'A' to 'Â'
+compose '^' 'a' to 'â'
+compose '~' 'A' to 'Ã'
+compose '~' 'a' to 'ã'
+compose '"' 'A' to 'Ä'
+compose '"' 'a' to 'ä'
+compose 'O' 'A' to 'Å'
+compose 'o' 'a' to 'å'
+compose '0' 'A' to 'Å'
+compose '0' 'a' to 'å'
+compose 'A' 'A' to 'Å'
+compose 'a' 'a' to 'å'
+compose 'A' 'E' to 'Æ'
+compose 'a' 'e' to 'æ'
+compose ',' 'C' to 'Ç'
+compose ',' 'c' to 'ç'
+compose '`' 'E' to 'È'
+compose '`' 'e' to 'è'
+compose '\'' 'E' to 'É'
+compose '\'' 'e' to 'é'
+compose '^' 'E' to 'Ê'
+compose '^' 'e' to 'ê'
+compose '"' 'E' to 'Ë'
+compose '"' 'e' to 'ë'
+compose '`' 'I' to 'Ì'
+compose '`' 'i' to 'ì'
+compose '\'' 'I' to 'Í'
+compose '\'' 'i' to 'í'
+compose '^' 'I' to 'Î'
+compose '^' 'i' to 'î'
+compose '"' 'I' to 'Ï'
+compose '"' 'i' to 'ï'
+compose '-' 'D' to 'Ð'
+compose '-' 'd' to 'ð'
+compose '~' 'N' to 'Ñ'
+compose '~' 'n' to 'ñ'
+compose '`' 'O' to 'Ò'
+compose '`' 'o' to 'ò'
+compose '\'' 'O' to 'Ó'
+compose '\'' 'o' to 'ó'
+compose '^' 'O' to 'Ô'
+compose '^' 'o' to 'ô'
+compose '~' 'O' to 'Õ'
+compose '~' 'o' to 'õ'
+compose '"' 'O' to 'Ö'
+compose '"' 'o' to 'ö'
+compose '/' 'O' to 'Ø'
+compose '/' 'o' to 'ø'
+compose '`' 'U' to 'Ù'
+compose '`' 'u' to 'ù'
+compose '\'' 'U' to 'Ú'
+compose '\'' 'u' to 'ú'
+compose '^' 'U' to 'Û'
+compose '^' 'u' to 'û'
+compose '"' 'U' to 'Ü'
+compose '"' 'u' to 'ü'
+compose '\'' 'Y' to 'Ý'
+compose '\'' 'y' to 'ý'
+compose 'T' 'H' to 'Þ'
+compose 't' 'h' to 'þ'
+compose 's' 's' to 'ß'
+compose '"' 'y' to 'ÿ'
+compose 's' 'z' to 'ß'
+compose 'i' 'j' to 'ÿ'
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
new file mode 100644
index 000000000000..3761ccf0f340
--- /dev/null
+++ b/drivers/tty/vt/keyboard.c
@@ -0,0 +1,1453 @@
+/*
+ * Written for linux by Johan Myreen as a translation from
+ * the assembly version by Linus (with diacriticals added)
+ *
+ * Some additional features added by Christoph Niemann (ChN), March 1993
+ *
+ * Loadable keymaps by Risto Kankkunen, May 1993
+ *
+ * Diacriticals redone & other small changes, aeb@cwi.nl, June 1993
+ * Added decr/incr_console, dynamic keymaps, Unicode support,
+ * dynamic function/string keys, led setting,  Sept 1994
+ * `Sticky' modifier keys, 951006.
+ *
+ * 11-11-96: SAK should now work in the raw mode (Martin Mares)
+ *
+ * Modified to provide 'generic' keyboard support by Hamish Macdonald
+ * Merge with the m68k keyboard driver and split-off of the PC low-level
+ * parts by Geert Uytterhoeven, May 1997
+ *
+ * 27-05-97: Added support for the Magic SysRq Key (Martin Mares)
+ * 30-07-98: Dead keys redone, aeb@cwi.nl.
+ * 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/consolemap.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+
+#include <linux/kbd_kern.h>
+#include <linux/kbd_diacr.h>
+#include <linux/vt_kern.h>
+#include <linux/input.h>
+#include <linux/reboot.h>
+#include <linux/notifier.h>
+#include <linux/jiffies.h>
+
+extern void ctrl_alt_del(void);
+
+/*
+ * Exported functions/variables
+ */
+
+#define KBD_DEFMODE ((1 << VC_REPEAT) | (1 << VC_META))
+
+/*
+ * Some laptops take the 789uiojklm,. keys as number pad when NumLock is on.
+ * This seems a good reason to start with NumLock off. On HIL keyboards
+ * of PARISC machines however there is no NumLock key and everyone expects the keypad
+ * to be used for numbers.
+ */
+
+#if defined(CONFIG_PARISC) && (defined(CONFIG_KEYBOARD_HIL) || defined(CONFIG_KEYBOARD_HIL_OLD))
+#define KBD_DEFLEDS (1 << VC_NUMLOCK)
+#else
+#define KBD_DEFLEDS 0
+#endif
+
+#define KBD_DEFLOCK 0
+
+void compute_shiftstate(void);
+
+/*
+ * Handler Tables.
+ */
+
+#define K_HANDLERS\
+        k_self,         k_fn,           k_spec,         k_pad,\
+        k_dead,         k_cons,         k_cur,          k_shift,\
+        k_meta,         k_ascii,        k_lock,         k_lowercase,\
+        k_slock,        k_dead2,        k_brl,          k_ignore
+
+typedef void (k_handler_fn)(struct vc_data *vc, unsigned char value,
+                            char up_flag);
+static k_handler_fn K_HANDLERS;
+static k_handler_fn *k_handler[16] = { K_HANDLERS };
+
+#define FN_HANDLERS\
+        fn_null,        fn_enter,       fn_show_ptregs, fn_show_mem,\
+        fn_show_state,  fn_send_intr,   fn_lastcons,    fn_caps_toggle,\
+        fn_num,         fn_hold,        fn_scroll_forw, fn_scroll_back,\
+        fn_boot_it,     fn_caps_on,     fn_compose,     fn_SAK,\
+        fn_dec_console, fn_inc_console, fn_spawn_con,   fn_bare_num
+
+typedef void (fn_handler_fn)(struct vc_data *vc);
+static fn_handler_fn FN_HANDLERS;
+static fn_handler_fn *fn_handler[] = { FN_HANDLERS };
+
+/*
+ * Variables exported for vt_ioctl.c
+ */
+
+/* maximum values each key_handler can handle */
+const int max_vals[] = {
+        255, ARRAY_SIZE(func_table) - 1, ARRAY_SIZE(fn_handler) - 1, NR_PAD - 1,
+        NR_DEAD - 1, 255, 3, NR_SHIFT - 1, 255, NR_ASCII - 1, NR_LOCK - 1,
+        255, NR_LOCK - 1, 255, NR_BRL - 1
+};
+
+const int NR_TYPES = ARRAY_SIZE(max_vals);
+
+struct kbd_struct kbd_table[MAX_NR_CONSOLES];
+EXPORT_SYMBOL_GPL(kbd_table);
+static struct kbd_struct *kbd = kbd_table;
+
+struct vt_spawn_console vt_spawn_con = {
+        .lock = __SPIN_LOCK_UNLOCKED(vt_spawn_con.lock),
+        .pid  = NULL,
+        .sig  = 0,
+};
+
+/*
+ * Variables exported for vt.c
+ */
+
+int shift_state = 0;
+
+/*
+ * Internal Data.
+ */
+
+static struct input_handler kbd_handler;
+static DEFINE_SPINLOCK(kbd_event_lock);
+static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)];  /* keyboard key bitmap */
+static unsigned char shift_down[NR_SHIFT];              /* shift state counters.. */
+static bool dead_key_next;
+static int npadch = -1;                                 /* -1 or number assembled on pad */
+static unsigned int diacr;
+static char rep;                                        /* flag telling character repeat */
+
+static unsigned char ledstate = 0xff;                   /* undefined */
+static unsigned char ledioctl;
+
+static struct ledptr {
+        unsigned int *addr;
+        unsigned int mask;
+        unsigned char valid:1;
+} ledptrs[3];
+
+/*
+ * Notifier list for console keyboard events
+ */
+static ATOMIC_NOTIFIER_HEAD(keyboard_notifier_list);
+
+int register_keyboard_notifier(struct notifier_block *nb)
+{
+        return atomic_notifier_chain_register(&keyboard_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_keyboard_notifier);
+
+int unregister_keyboard_notifier(struct notifier_block *nb)
+{
+        return atomic_notifier_chain_unregister(&keyboard_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_keyboard_notifier);
+
+/*
+ * Translation of scancodes to keycodes. We set them on only the first
+ * keyboard in the list that accepts the scancode and keycode.
+ * Explanation for not choosing the first attached keyboard anymore:
+ *  USB keyboards for example have two event devices: one for all "normal"
+ *  keys and one for extra function keys (like "volume up", "make coffee",
+ *  etc.). So this means that scancodes for the extra function keys won't
+ *  be valid for the first event device, but will be for the second.
+ */
+
+struct getset_keycode_data {
+        struct input_keymap_entry ke;
+        int error;
+};
+
+static int getkeycode_helper(struct input_handle *handle, void *data)
+{
+        struct getset_keycode_data *d = data;
+
+        d->error = input_get_keycode(handle->dev, &d->ke);
+
+        return d->error == 0; /* stop as soon as we successfully get one */
+}
+
+int getkeycode(unsigned int scancode)
+{
+        struct getset_keycode_data d = {
+                .ke     = {
+                        .flags          = 0,
+                        .len            = sizeof(scancode),
+                        .keycode        = 0,
+                },
+                .error  = -ENODEV,
+        };
+
+        memcpy(d.ke.scancode, &scancode, sizeof(scancode));
+
+        input_handler_for_each_handle(&kbd_handler, &d, getkeycode_helper);
+
+        return d.error ?: d.ke.keycode;
+}
+
+static int setkeycode_helper(struct input_handle *handle, void *data)
+{
+        struct getset_keycode_data *d = data;
+
+        d->error = input_set_keycode(handle->dev, &d->ke);
+
+        return d->error == 0; /* stop as soon as we successfully set one */
+}
+
+int setkeycode(unsigned int scancode, unsigned int keycode)
+{
+        struct getset_keycode_data d = {
+                .ke     = {
+                        .flags          = 0,
+                        .len            = sizeof(scancode),
+                        .keycode        = keycode,
+                },
+                .error  = -ENODEV,
+        };
+
+        memcpy(d.ke.scancode, &scancode, sizeof(scancode));
+
+        input_handler_for_each_handle(&kbd_handler, &d, setkeycode_helper);
+
+        return d.error;
+}
+
+/*
+ * Making beeps and bells. Note that we prefer beeps to bells, but when
+ * shutting the sound off we do both.
+ */
+
+static int kd_sound_helper(struct input_handle *handle, void *data)
+{
+        unsigned int *hz = data;
+        struct input_dev *dev = handle->dev;
+
+        if (test_bit(EV_SND, dev->evbit)) {
+                if (test_bit(SND_TONE, dev->sndbit)) {
+                        input_inject_event(handle, EV_SND, SND_TONE, *hz);
+                        if (*hz)
+                                return 0;
+                }
+                if (test_bit(SND_BELL, dev->sndbit))
+                        input_inject_event(handle, EV_SND, SND_BELL, *hz ? 1 : 0);
+        }
+
+        return 0;
+}
+
+static void kd_nosound(unsigned long ignored)
+{
+        static unsigned int zero;
+
+        input_handler_for_each_handle(&kbd_handler, &zero, kd_sound_helper);
+}
+
+static DEFINE_TIMER(kd_mksound_timer, kd_nosound, 0, 0);
+
+void kd_mksound(unsigned int hz, unsigned int ticks)
+{
+        del_timer_sync(&kd_mksound_timer);
+
+        input_handler_for_each_handle(&kbd_handler, &hz, kd_sound_helper);
+
+        if (hz && ticks)
+                mod_timer(&kd_mksound_timer, jiffies + ticks);
+}
+EXPORT_SYMBOL(kd_mksound);
+
+/*
+ * Setting the keyboard rate.
+ */
+
+static int kbd_rate_helper(struct input_handle *handle, void *data)
+{
+        struct input_dev *dev = handle->dev;
+        struct kbd_repeat *rep = data;
+
+        if (test_bit(EV_REP, dev->evbit)) {
+
+                if (rep[0].delay > 0)
+                        input_inject_event(handle,
+                                           EV_REP, REP_DELAY, rep[0].delay);
+                if (rep[0].period > 0)
+                        input_inject_event(handle,
+                                           EV_REP, REP_PERIOD, rep[0].period);
+
+                rep[1].delay = dev->rep[REP_DELAY];
+                rep[1].period = dev->rep[REP_PERIOD];
+        }
+
+        return 0;
+}
+
+int kbd_rate(struct kbd_repeat *rep)
+{
+        struct kbd_repeat data[2] = { *rep };
+
+        input_handler_for_each_handle(&kbd_handler, data, kbd_rate_helper);
+        *rep = data[1]; /* Copy currently used settings */
+
+        return 0;
+}
+
+/*
+ * Helper Functions.
+ */
+static void put_queue(struct vc_data *vc, int ch)
+{
+        struct tty_struct *tty = vc->port.tty;
+
+        if (tty) {
+                tty_insert_flip_char(tty, ch, 0);
+                con_schedule_flip(tty);
+        }
+}
+
+static void puts_queue(struct vc_data *vc, char *cp)
+{
+        struct tty_struct *tty = vc->port.tty;
+
+        if (!tty)
+                return;
+
+        while (*cp) {
+                tty_insert_flip_char(tty, *cp, 0);
+                cp++;
+        }
+        con_schedule_flip(tty);
+}
+
+static void applkey(struct vc_data *vc, int key, char mode)
+{
+        static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
+
+        buf[1] = (mode ? 'O' : '[');
+        buf[2] = key;
+        puts_queue(vc, buf);
+}
+
+/*
+ * Many other routines do put_queue, but I think either
+ * they produce ASCII, or they produce some user-assigned
+ * string, and in both cases we might assume that it is
+ * in utf-8 already.
+ */
+static void to_utf8(struct vc_data *vc, uint c)
+{
+        if (c < 0x80)
+                /*  0******* */
+                put_queue(vc, c);
+        else if (c < 0x800) {
+                /* 110***** 10****** */
+                put_queue(vc, 0xc0 | (c >> 6));
+                put_queue(vc, 0x80 | (c & 0x3f));
+        } else if (c < 0x10000) {
+                if (c >= 0xD800 && c < 0xE000)
+                        return;
+                if (c == 0xFFFF)
+                        return;
+                /* 1110**** 10****** 10****** */
+                put_queue(vc, 0xe0 | (c >> 12));
+                put_queue(vc, 0x80 | ((c >> 6) & 0x3f));
+                put_queue(vc, 0x80 | (c & 0x3f));
+        } else if (c < 0x110000) {
+                /* 11110*** 10****** 10****** 10****** */
+                put_queue(vc, 0xf0 | (c >> 18));
+                put_queue(vc, 0x80 | ((c >> 12) & 0x3f));
+                put_queue(vc, 0x80 | ((c >> 6) & 0x3f));
+                put_queue(vc, 0x80 | (c & 0x3f));
+        }
+}
+
+/*
+ * Called after returning from RAW mode or when changing consoles - recompute
+ * shift_down[] and shift_state from key_down[] maybe called when keymap is
+ * undefined, so that shiftkey release is seen
+ */
+void compute_shiftstate(void)
+{
+        unsigned int i, j, k, sym, val;
+
+        shift_state = 0;
+        memset(shift_down, 0, sizeof(shift_down));
+
+        for (i = 0; i < ARRAY_SIZE(key_down); i++) {
+
+                if (!key_down[i])
+                        continue;
+
+                k = i * BITS_PER_LONG;
+
+                for (j = 0; j < BITS_PER_LONG; j++, k++) {
+
+                        if (!test_bit(k, key_down))
+                                continue;
+
+                        sym = U(key_maps[0][k]);
+                        if (KTYP(sym) != KT_SHIFT && KTYP(sym) != KT_SLOCK)
+                                continue;
+
+                        val = KVAL(sym);
+                        if (val == KVAL(K_CAPSSHIFT))
+                                val = KVAL(K_SHIFT);
+
+                        shift_down[val]++;
+                        shift_state |= (1 << val);
+                }
+        }
+}
+
+/*
+ * We have a combining character DIACR here, followed by the character CH.
+ * If the combination occurs in the table, return the corresponding value.
+ * Otherwise, if CH is a space or equals DIACR, return DIACR.
+ * Otherwise, conclude that DIACR was not combining after all,
+ * queue it and return CH.
+ */
+static unsigned int handle_diacr(struct vc_data *vc, unsigned int ch)
+{
+        unsigned int d = diacr;
+        unsigned int i;
+
+        diacr = 0;
+
+        if ((d & ~0xff) == BRL_UC_ROW) {
+                if ((ch & ~0xff) == BRL_UC_ROW)
+                        return d | ch;
+        } else {
+                for (i = 0; i < accent_table_size; i++)
+                        if (accent_table[i].diacr == d && accent_table[i].base == ch)
+                                return accent_table[i].result;
+        }
+
+        if (ch == ' ' || ch == (BRL_UC_ROW|0) || ch == d)
+                return d;
+
+        if (kbd->kbdmode == VC_UNICODE)
+                to_utf8(vc, d);
+        else {
+                int c = conv_uni_to_8bit(d);
+                if (c != -1)
+                        put_queue(vc, c);
+        }
+
+        return ch;
+}
+
+/*
+ * Special function handlers
+ */
+static void fn_enter(struct vc_data *vc)
+{
+        if (diacr) {
+                if (kbd->kbdmode == VC_UNICODE)
+                        to_utf8(vc, diacr);
+                else {
+                        int c = conv_uni_to_8bit(diacr);
+                        if (c != -1)
+                                put_queue(vc, c);
+                }
+                diacr = 0;
+        }
+
+        put_queue(vc, 13);
+        if (vc_kbd_mode(kbd, VC_CRLF))
+                put_queue(vc, 10);
+}
+
+static void fn_caps_toggle(struct vc_data *vc)
+{
+        if (rep)
+                return;
+
+        chg_vc_kbd_led(kbd, VC_CAPSLOCK);
+}
+
+static void fn_caps_on(struct vc_data *vc)
+{
+        if (rep)
+                return;
+
+        set_vc_kbd_led(kbd, VC_CAPSLOCK);
+}
+
+static void fn_show_ptregs(struct vc_data *vc)
+{
+        struct pt_regs *regs = get_irq_regs();
+
+        if (regs)
+                show_regs(regs);
+}
+
+static void fn_hold(struct vc_data *vc)
+{
+        struct tty_struct *tty = vc->port.tty;
+
+        if (rep || !tty)
+                return;
+
+        /*
+         * Note: SCROLLOCK will be set (cleared) by stop_tty (start_tty);
+         * these routines are also activated by ^S/^Q.
+         * (And SCROLLOCK can also be set by the ioctl KDSKBLED.)
+         */
+        if (tty->stopped)
+                start_tty(tty);
+        else
+                stop_tty(tty);
+}
+
+static void fn_num(struct vc_data *vc)
+{
+        if (vc_kbd_mode(kbd, VC_APPLIC))
+                applkey(vc, 'P', 1);
+        else
+                fn_bare_num(vc);
+}
+
+/*
+ * Bind this to Shift-NumLock if you work in application keypad mode
+ * but want to be able to change the NumLock flag.
+ * Bind this to NumLock if you prefer that the NumLock key always
+ * changes the NumLock flag.
+ */
+static void fn_bare_num(struct vc_data *vc)
+{
+        if (!rep)
+                chg_vc_kbd_led(kbd, VC_NUMLOCK);
+}
+
+static void fn_lastcons(struct vc_data *vc)
+{
+        /* switch to the last used console, ChN */
+        set_console(last_console);
+}
+
+static void fn_dec_console(struct vc_data *vc)
+{
+        int i, cur = fg_console;
+
+        /* Currently switching?  Queue this next switch relative to that. */
+        if (want_console != -1)
+                cur = want_console;
+
+        for (i = cur - 1; i != cur; i--) {
+                if (i == -1)
+                        i = MAX_NR_CONSOLES - 1;
+                if (vc_cons_allocated(i))
+                        break;
+        }
+        set_console(i);
+}
+
+static void fn_inc_console(struct vc_data *vc)
+{
+        int i, cur = fg_console;
+
+        /* Currently switching?  Queue this next switch relative to that. */
+        if (want_console != -1)
+                cur = want_console;
+
+        for (i = cur+1; i != cur; i++) {
+                if (i == MAX_NR_CONSOLES)
+                        i = 0;
+                if (vc_cons_allocated(i))
+                        break;
+        }
+        set_console(i);
+}
+
+static void fn_send_intr(struct vc_data *vc)
+{
+        struct tty_struct *tty = vc->port.tty;
+
+        if (!tty)
+                return;
+        tty_insert_flip_char(tty, 0, TTY_BREAK);
+        con_schedule_flip(tty);
+}
+
+static void fn_scroll_forw(struct vc_data *vc)
+{
+        scrollfront(vc, 0);
+}
+
+static void fn_scroll_back(struct vc_data *vc)
+{
+        scrollback(vc, 0);
+}
+
+static void fn_show_mem(struct vc_data *vc)
+{
+        show_mem(0);
+}
+
+static void fn_show_state(struct vc_data *vc)
+{
+        show_state();
+}
+
+static void fn_boot_it(struct vc_data *vc)
+{
+        ctrl_alt_del();
+}
+
+static void fn_compose(struct vc_data *vc)
+{
+        dead_key_next = true;
+}
+
+static void fn_spawn_con(struct vc_data *vc)
+{
+        spin_lock(&vt_spawn_con.lock);
+        if (vt_spawn_con.pid)
+                if (kill_pid(vt_spawn_con.pid, vt_spawn_con.sig, 1)) {
+                        put_pid(vt_spawn_con.pid);
+                        vt_spawn_con.pid = NULL;
+                }
+        spin_unlock(&vt_spawn_con.lock);
+}
+
+static void fn_SAK(struct vc_data *vc)
+{
+        struct work_struct *SAK_work = &vc_cons[fg_console].SAK_work;
+        schedule_work(SAK_work);
+}
+
+static void fn_null(struct vc_data *vc)
+{
+        compute_shiftstate();
+}
+
+/*
+ * Special key handlers
+ */
+static void k_ignore(struct vc_data *vc, unsigned char value, char up_flag)
+{
+}
+
+static void k_spec(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        if (up_flag)
+                return;
+        if (value >= ARRAY_SIZE(fn_handler))
+                return;
+        if ((kbd->kbdmode == VC_RAW ||
+             kbd->kbdmode == VC_MEDIUMRAW ||
+             kbd->kbdmode == VC_OFF) &&
+             value != KVAL(K_SAK))
+                return;         /* SAK is allowed even in raw mode */
+        fn_handler[value](vc);
+}
+
+static void k_lowercase(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        pr_err("k_lowercase was called - impossible\n");
+}
+
+static void k_unicode(struct vc_data *vc, unsigned int value, char up_flag)
+{
+        if (up_flag)
+                return;         /* no action, if this is a key release */
+
+        if (diacr)
+                value = handle_diacr(vc, value);
+
+        if (dead_key_next) {
+                dead_key_next = false;
+                diacr = value;
+                return;
+        }
+        if (kbd->kbdmode == VC_UNICODE)
+                to_utf8(vc, value);
+        else {
+                int c = conv_uni_to_8bit(value);
+                if (c != -1)
+                        put_queue(vc, c);
+        }
+}
+
+/*
+ * Handle dead key. Note that we now may have several
+ * dead keys modifying the same character. Very useful
+ * for Vietnamese.
+ */
+static void k_deadunicode(struct vc_data *vc, unsigned int value, char up_flag)
+{
+        if (up_flag)
+                return;
+
+        diacr = (diacr ? handle_diacr(vc, value) : value);
+}
+
+static void k_self(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        k_unicode(vc, conv_8bit_to_uni(value), up_flag);
+}
+
+static void k_dead2(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        k_deadunicode(vc, value, up_flag);
+}
+
+/*
+ * Obsolete - for backwards compatibility only
+ */
+static void k_dead(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        static const unsigned char ret_diacr[NR_DEAD] = {'`', '\'', '^', '~', '"', ',' };
+
+        k_deadunicode(vc, ret_diacr[value], up_flag);
+}
+
+static void k_cons(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        if (up_flag)
+                return;
+
+        set_console(value);
+}
+
+static void k_fn(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        if (up_flag)
+                return;
+
+        if ((unsigned)value < ARRAY_SIZE(func_table)) {
+                if (func_table[value])
+                        puts_queue(vc, func_table[value]);
+        } else
+                pr_err("k_fn called with value=%d\n", value);
+}
+
+static void k_cur(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        static const char cur_chars[] = "BDCA";
+
+        if (up_flag)
+                return;
+
+        applkey(vc, cur_chars[value], vc_kbd_mode(kbd, VC_CKMODE));
+}
+
+static void k_pad(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        static const char pad_chars[] = "0123456789+-*/\015,.?()#";
+        static const char app_map[] = "pqrstuvwxylSRQMnnmPQS";
+
+        if (up_flag)
+                return;         /* no action, if this is a key release */
+
+        /* kludge... shift forces cursor/number keys */
+        if (vc_kbd_mode(kbd, VC_APPLIC) && !shift_down[KG_SHIFT]) {
+                applkey(vc, app_map[value], 1);
+                return;
+        }
+
+        if (!vc_kbd_led(kbd, VC_NUMLOCK)) {
+
+                switch (value) {
+                case KVAL(K_PCOMMA):
+                case KVAL(K_PDOT):
+                        k_fn(vc, KVAL(K_REMOVE), 0);
+                        return;
+                case KVAL(K_P0):
+                        k_fn(vc, KVAL(K_INSERT), 0);
+                        return;
+                case KVAL(K_P1):
+                        k_fn(vc, KVAL(K_SELECT), 0);
+                        return;
+                case KVAL(K_P2):
+                        k_cur(vc, KVAL(K_DOWN), 0);
+                        return;
+                case KVAL(K_P3):
+                        k_fn(vc, KVAL(K_PGDN), 0);
+                        return;
+                case KVAL(K_P4):
+                        k_cur(vc, KVAL(K_LEFT), 0);
+                        return;
+                case KVAL(K_P6):
+                        k_cur(vc, KVAL(K_RIGHT), 0);
+                        return;
+                case KVAL(K_P7):
+                        k_fn(vc, KVAL(K_FIND), 0);
+                        return;
+                case KVAL(K_P8):
+                        k_cur(vc, KVAL(K_UP), 0);
+                        return;
+                case KVAL(K_P9):
+                        k_fn(vc, KVAL(K_PGUP), 0);
+                        return;
+                case KVAL(K_P5):
+                        applkey(vc, 'G', vc_kbd_mode(kbd, VC_APPLIC));
+                        return;
+                }
+        }
+
+        put_queue(vc, pad_chars[value]);
+        if (value == KVAL(K_PENTER) && vc_kbd_mode(kbd, VC_CRLF))
+                put_queue(vc, 10);
+}
+
+static void k_shift(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        int old_state = shift_state;
+
+        if (rep)
+                return;
+        /*
+         * Mimic typewriter:
+         * a CapsShift key acts like Shift but undoes CapsLock
+         */
+        if (value == KVAL(K_CAPSSHIFT)) {
+                value = KVAL(K_SHIFT);
+                if (!up_flag)
+                        clr_vc_kbd_led(kbd, VC_CAPSLOCK);
+        }
+
+        if (up_flag) {
+                /*
+                 * handle the case that two shift or control
+                 * keys are depressed simultaneously
+                 */
+                if (shift_down[value])
+                        shift_down[value]--;
+        } else
+                shift_down[value]++;
+
+        if (shift_down[value])
+                shift_state |= (1 << value);
+        else
+                shift_state &= ~(1 << value);
+
+        /* kludge */
+        if (up_flag && shift_state != old_state && npadch != -1) {
+                if (kbd->kbdmode == VC_UNICODE)
+                        to_utf8(vc, npadch);
+                else
+                        put_queue(vc, npadch & 0xff);
+                npadch = -1;
+        }
+}
+
+static void k_meta(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        if (up_flag)
+                return;
+
+        if (vc_kbd_mode(kbd, VC_META)) {
+                put_queue(vc, '\033');
+                put_queue(vc, value);
+        } else
+                put_queue(vc, value | 0x80);
+}
+
+static void k_ascii(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        int base;
+
+        if (up_flag)
+                return;
+
+        if (value < 10) {
+                /* decimal input of code, while Alt depressed */
+                base = 10;
+        } else {
+                /* hexadecimal input of code, while AltGr depressed */
+                value -= 10;
+                base = 16;
+        }
+
+        if (npadch == -1)
+                npadch = value;
+        else
+                npadch = npadch * base + value;
+}
+
+static void k_lock(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        if (up_flag || rep)
+                return;
+
+        chg_vc_kbd_lock(kbd, value);
+}
+
+static void k_slock(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        k_shift(vc, value, up_flag);
+        if (up_flag || rep)
+                return;
+
+        chg_vc_kbd_slock(kbd, value);
+        /* try to make Alt, oops, AltGr and such work */
+        if (!key_maps[kbd->lockstate ^ kbd->slockstate]) {
+                kbd->slockstate = 0;
+                chg_vc_kbd_slock(kbd, value);
+        }
+}
+
+/* by default, 300ms interval for combination release */
+static unsigned brl_timeout = 300;
+MODULE_PARM_DESC(brl_timeout, "Braille keys release delay in ms (0 for commit on first key release)");
+module_param(brl_timeout, uint, 0644);
+
+static unsigned brl_nbchords = 1;
+MODULE_PARM_DESC(brl_nbchords, "Number of chords that produce a braille pattern (0 for dead chords)");
+module_param(brl_nbchords, uint, 0644);
+
+static void k_brlcommit(struct vc_data *vc, unsigned int pattern, char up_flag)
+{
+        static unsigned long chords;
+        static unsigned committed;
+
+        if (!brl_nbchords)
+                k_deadunicode(vc, BRL_UC_ROW | pattern, up_flag);
+        else {
+                committed |= pattern;
+                chords++;
+                if (chords == brl_nbchords) {
+                        k_unicode(vc, BRL_UC_ROW | committed, up_flag);
+                        chords = 0;
+                        committed = 0;
+                }
+        }
+}
+
+static void k_brl(struct vc_data *vc, unsigned char value, char up_flag)
+{
+        static unsigned pressed, committing;
+        static unsigned long releasestart;
+
+        if (kbd->kbdmode != VC_UNICODE) {
+                if (!up_flag)
+                        pr_warning("keyboard mode must be unicode for braille patterns\n");
+                return;
+        }
+
+        if (!value) {
+                k_unicode(vc, BRL_UC_ROW, up_flag);
+                return;
+        }
+
+        if (value > 8)
+                return;
+
+        if (!up_flag) {
+                pressed |= 1 << (value - 1);
+                if (!brl_timeout)
+                        committing = pressed;
+        } else if (brl_timeout) {
+                if (!committing ||
+                    time_after(jiffies,
+                               releasestart + msecs_to_jiffies(brl_timeout))) {
+                        committing = pressed;
+                        releasestart = jiffies;
+                }
+                pressed &= ~(1 << (value - 1));
+                if (!pressed && committing) {
+                        k_brlcommit(vc, committing, 0);
+                        committing = 0;
+                }
+        } else {
+                if (committing) {
+                        k_brlcommit(vc, committing, 0);
+                        committing = 0;
+                }
+                pressed &= ~(1 << (value - 1));
+        }
+}
+
+/*
+ * The leds display either (i) the status of NumLock, CapsLock, ScrollLock,
+ * or (ii) whatever pattern of lights people want to show using KDSETLED,
+ * or (iii) specified bits of specified words in kernel memory.
+ */
+unsigned char getledstate(void)
+{
+        return ledstate;
+}
+
+void setledstate(struct kbd_struct *kbd, unsigned int led)
+{
+        if (!(led & ~7)) {
+                ledioctl = led;
+                kbd->ledmode = LED_SHOW_IOCTL;
+        } else
+                kbd->ledmode = LED_SHOW_FLAGS;
+
+        set_leds();
+}
+
+static inline unsigned char getleds(void)
+{
+        struct kbd_struct *kbd = kbd_table + fg_console;
+        unsigned char leds;
+        int i;
+
+        if (kbd->ledmode == LED_SHOW_IOCTL)
+                return ledioctl;
+
+        leds = kbd->ledflagstate;
+
+        if (kbd->ledmode == LED_SHOW_MEM) {
+                for (i = 0; i < 3; i++)
+                        if (ledptrs[i].valid) {
+                                if (*ledptrs[i].addr & ledptrs[i].mask)
+                                        leds |= (1 << i);
+                                else
+                                        leds &= ~(1 << i);
+                        }
+        }
+        return leds;
+}
+
+static int kbd_update_leds_helper(struct input_handle *handle, void *data)
+{
+        unsigned char leds = *(unsigned char *)data;
+
+        if (test_bit(EV_LED, handle->dev->evbit)) {
+                input_inject_event(handle, EV_LED, LED_SCROLLL, !!(leds & 0x01));
+                input_inject_event(handle, EV_LED, LED_NUML,    !!(leds & 0x02));
+                input_inject_event(handle, EV_LED, LED_CAPSL,   !!(leds & 0x04));
+                input_inject_event(handle, EV_SYN, SYN_REPORT, 0);
+        }
+
+        return 0;
+}
+
+/*
+ * This is the tasklet that updates LED state on all keyboards
+ * attached to the box. The reason we use tasklet is that we
+ * need to handle the scenario when keyboard handler is not
+ * registered yet but we already getting updates form VT to
+ * update led state.
+ */
+static void kbd_bh(unsigned long dummy)
+{
+        unsigned char leds = getleds();
+
+        if (leds != ledstate) {
+                input_handler_for_each_handle(&kbd_handler, &leds,
+                                              kbd_update_leds_helper);
+                ledstate = leds;
+        }
+}
+
+DECLARE_TASKLET_DISABLED(keyboard_tasklet, kbd_bh, 0);
+
+#if defined(CONFIG_X86) || defined(CONFIG_IA64) || defined(CONFIG_ALPHA) ||\
+    defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) ||\
+    defined(CONFIG_PARISC) || defined(CONFIG_SUPERH) ||\
+    (defined(CONFIG_ARM) && defined(CONFIG_KEYBOARD_ATKBD) && !defined(CONFIG_ARCH_RPC)) ||\
+    defined(CONFIG_AVR32)
+
+#define HW_RAW(dev) (test_bit(EV_MSC, dev->evbit) && test_bit(MSC_RAW, dev->mscbit) &&\
+                        ((dev)->id.bustype == BUS_I8042) && ((dev)->id.vendor == 0x0001) && ((dev)->id.product == 0x0001))
+
+static const unsigned short x86_keycodes[256] =
+        { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
+         16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+         32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
+         48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
+         64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
+         80, 81, 82, 83, 84,118, 86, 87, 88,115,120,119,121,112,123, 92,
+        284,285,309,  0,312, 91,327,328,329,331,333,335,336,337,338,339,
+        367,288,302,304,350, 89,334,326,267,126,268,269,125,347,348,349,
+        360,261,262,263,268,376,100,101,321,316,373,286,289,102,351,355,
+        103,104,105,275,287,279,258,106,274,107,294,364,358,363,362,361,
+        291,108,381,281,290,272,292,305,280, 99,112,257,306,359,113,114,
+        264,117,271,374,379,265,266, 93, 94, 95, 85,259,375,260, 90,116,
+        377,109,111,277,278,282,283,295,296,297,299,300,301,293,303,307,
+        308,310,313,314,315,317,318,319,320,357,322,323,324,325,276,330,
+        332,340,365,342,343,344,345,346,356,270,341,368,369,370,371,372 };
+
+#ifdef CONFIG_SPARC
+static int sparc_l1_a_state;
+extern void sun_do_break(void);
+#endif
+
+static int emulate_raw(struct vc_data *vc, unsigned int keycode,
+                       unsigned char up_flag)
+{
+        int code;
+
+        switch (keycode) {
+
+        case KEY_PAUSE:
+                put_queue(vc, 0xe1);
+                put_queue(vc, 0x1d | up_flag);
+                put_queue(vc, 0x45 | up_flag);
+                break;
+
+        case KEY_HANGEUL:
+                if (!up_flag)
+                        put_queue(vc, 0xf2);
+                break;
+
+        case KEY_HANJA:
+                if (!up_flag)
+                        put_queue(vc, 0xf1);
+                break;
+
+        case KEY_SYSRQ:
+                /*
+                 * Real AT keyboards (that's what we're trying
+                 * to emulate here emit 0xe0 0x2a 0xe0 0x37 when
+                 * pressing PrtSc/SysRq alone, but simply 0x54
+                 * when pressing Alt+PrtSc/SysRq.
+                 */
+                if (test_bit(KEY_LEFTALT, key_down) ||
+                    test_bit(KEY_RIGHTALT, key_down)) {
+                        put_queue(vc, 0x54 | up_flag);
+                } else {
+                        put_queue(vc, 0xe0);
+                        put_queue(vc, 0x2a | up_flag);
+                        put_queue(vc, 0xe0);
+                        put_queue(vc, 0x37 | up_flag);
+                }
+                break;
+
+        default:
+                if (keycode > 255)
+                        return -1;
+
+                code = x86_keycodes[keycode];
+                if (!code)
+                        return -1;
+
+                if (code & 0x100)
+                        put_queue(vc, 0xe0);
+                put_queue(vc, (code & 0x7f) | up_flag);
+
+                break;
+        }
+
+        return 0;
+}
+
+#else
+
+#define HW_RAW(dev)     0
+
+static int emulate_raw(struct vc_data *vc, unsigned int keycode, unsigned char up_flag)
+{
+        if (keycode > 127)
+                return -1;
+
+        put_queue(vc, keycode | up_flag);
+        return 0;
+}
+#endif
+
+static void kbd_rawcode(unsigned char data)
+{
+        struct vc_data *vc = vc_cons[fg_console].d;
+
+        kbd = kbd_table + vc->vc_num;
+        if (kbd->kbdmode == VC_RAW)
+                put_queue(vc, data);
+}
+
+static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
+{
+        struct vc_data *vc = vc_cons[fg_console].d;
+        unsigned short keysym, *key_map;
+        unsigned char type;
+        bool raw_mode;
+        struct tty_struct *tty;
+        int shift_final;
+        struct keyboard_notifier_param param = { .vc = vc, .value = keycode, .down = down };
+        int rc;
+
+        tty = vc->port.tty;
+
+        if (tty && (!tty->driver_data)) {
+                /* No driver data? Strange. Okay we fix it then. */
+                tty->driver_data = vc;
+        }
+
+        kbd = kbd_table + vc->vc_num;
+
+#ifdef CONFIG_SPARC
+        if (keycode == KEY_STOP)
+                sparc_l1_a_state = down;
+#endif
+
+        rep = (down == 2);
+
+        raw_mode = (kbd->kbdmode == VC_RAW);
+        if (raw_mode && !hw_raw)
+                if (emulate_raw(vc, keycode, !down << 7))
+                        if (keycode < BTN_MISC && printk_ratelimit())
+                                pr_warning("can't emulate rawmode for keycode %d\n",
+                                           keycode);
+
+#ifdef CONFIG_SPARC
+        if (keycode == KEY_A && sparc_l1_a_state) {
+                sparc_l1_a_state = false;
+                sun_do_break();
+        }
+#endif
+
+        if (kbd->kbdmode == VC_MEDIUMRAW) {
+                /*
+                 * This is extended medium raw mode, with keys above 127
+                 * encoded as 0, high 7 bits, low 7 bits, with the 0 bearing
+                 * the 'up' flag if needed. 0 is reserved, so this shouldn't
+                 * interfere with anything else. The two bytes after 0 will
+                 * always have the up flag set not to interfere with older
+                 * applications. This allows for 16384 different keycodes,
+                 * which should be enough.
+                 */
+                if (keycode < 128) {
+                        put_queue(vc, keycode | (!down << 7));
+                } else {
+                        put_queue(vc, !down << 7);
+                        put_queue(vc, (keycode >> 7) | 0x80);
+                        put_queue(vc, keycode | 0x80);
+                }
+                raw_mode = true;
+        }
+
+        if (down)
+                set_bit(keycode, key_down);
+        else
+                clear_bit(keycode, key_down);
+
+        if (rep &&
+            (!vc_kbd_mode(kbd, VC_REPEAT) ||
+             (tty && !L_ECHO(tty) && tty_chars_in_buffer(tty)))) {
+                /*
+                 * Don't repeat a key if the input buffers are not empty and the
+                 * characters get aren't echoed locally. This makes key repeat
+                 * usable with slow applications and under heavy loads.
+                 */
+                return;
+        }
+
+        param.shift = shift_final = (shift_state | kbd->slockstate) ^ kbd->lockstate;
+        param.ledstate = kbd->ledflagstate;
+        key_map = key_maps[shift_final];
+
+        rc = atomic_notifier_call_chain(&keyboard_notifier_list,
+                                        KBD_KEYCODE, &param);
+        if (rc == NOTIFY_STOP || !key_map) {
+                atomic_notifier_call_chain(&keyboard_notifier_list,
+                                           KBD_UNBOUND_KEYCODE, &param);
+                compute_shiftstate();
+                kbd->slockstate = 0;
+                return;
+        }
+
+        if (keycode < NR_KEYS)
+                keysym = key_map[keycode];
+        else if (keycode >= KEY_BRL_DOT1 && keycode <= KEY_BRL_DOT8)
+                keysym = U(K(KT_BRL, keycode - KEY_BRL_DOT1 + 1));
+        else
+                return;
+
+        type = KTYP(keysym);
+
+        if (type < 0xf0) {
+                param.value = keysym;
+                rc = atomic_notifier_call_chain(&keyboard_notifier_list,
+                                                KBD_UNICODE, &param);
+                if (rc != NOTIFY_STOP)
+                        if (down && !raw_mode)
+                                to_utf8(vc, keysym);
+                return;
+        }
+
+        type -= 0xf0;
+
+        if (type == KT_LETTER) {
+                type = KT_LATIN;
+                if (vc_kbd_led(kbd, VC_CAPSLOCK)) {
+                        key_map = key_maps[shift_final ^ (1 << KG_SHIFT)];
+                        if (key_map)
+                                keysym = key_map[keycode];
+                }
+        }
+
+        param.value = keysym;
+        rc = atomic_notifier_call_chain(&keyboard_notifier_list,
+                                        KBD_KEYSYM, &param);
+        if (rc == NOTIFY_STOP)
+                return;
+
+        if ((raw_mode || kbd->kbdmode == VC_OFF) && type != KT_SPEC && type != KT_SHIFT)
+                return;
+
+        (*k_handler[type])(vc, keysym & 0xff, !down);
+
+        param.ledstate = kbd->ledflagstate;
+        atomic_notifier_call_chain(&keyboard_notifier_list, KBD_POST_KEYSYM, &param);
+
+        if (type != KT_SLOCK)
+                kbd->slockstate = 0;
+}
+
+static void kbd_event(struct input_handle *handle, unsigned int event_type,
+                      unsigned int event_code, int value)
+{
+        /* We are called with interrupts disabled, just take the lock */
+        spin_lock(&kbd_event_lock);
+
+        if (event_type == EV_MSC && event_code == MSC_RAW && HW_RAW(handle->dev))
+                kbd_rawcode(value);
+        if (event_type == EV_KEY)
+                kbd_keycode(event_code, value, HW_RAW(handle->dev));
+
+        spin_unlock(&kbd_event_lock);
+
+        tasklet_schedule(&keyboard_tasklet);
+        do_poke_blanked_console = 1;
+        schedule_console_callback();
+}
+
+static bool kbd_match(struct input_handler *handler, struct input_dev *dev)
+{
+        int i;
+
+        if (test_bit(EV_SND, dev->evbit))
+                return true;
+
+        if (test_bit(EV_KEY, dev->evbit)) {
+                for (i = KEY_RESERVED; i < BTN_MISC; i++)
+                        if (test_bit(i, dev->keybit))
+                                return true;
+                for (i = KEY_BRL_DOT1; i <= KEY_BRL_DOT10; i++)
+                        if (test_bit(i, dev->keybit))
+                                return true;
+        }
+
+        return false;
+}
+
+/*
+ * When a keyboard (or other input device) is found, the kbd_connect
+ * function is called. The function then looks at the device, and if it
+ * likes it, it can open it and get events from it. In this (kbd_connect)
+ * function, we should decide which VT to bind that keyboard to initially.
+ */
+static int kbd_connect(struct input_handler *handler, struct input_dev *dev,
+                        const struct input_device_id *id)
+{
+        struct input_handle *handle;
+        int error;
+
+        handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+        if (!handle)
+                return -ENOMEM;
+
+        handle->dev = dev;
+        handle->handler = handler;
+        handle->name = "kbd";
+
+        error = input_register_handle(handle);
+        if (error)
+                goto err_free_handle;
+
+        error = input_open_device(handle);
+        if (error)
+                goto err_unregister_handle;
+
+        return 0;
+
+ err_unregister_handle:
+        input_unregister_handle(handle);
+ err_free_handle:
+        kfree(handle);
+        return error;
+}
+
+static void kbd_disconnect(struct input_handle *handle)
+{
+        input_close_device(handle);
+        input_unregister_handle(handle);
+        kfree(handle);
+}
+
+/*
+ * Start keyboard handler on the new keyboard by refreshing LED state to
+ * match the rest of the system.
+ */
+static void kbd_start(struct input_handle *handle)
+{
+        tasklet_disable(&keyboard_tasklet);
+
+        if (ledstate != 0xff)
+                kbd_update_leds_helper(handle, &ledstate);
+
+        tasklet_enable(&keyboard_tasklet);
+}
+
+static const struct input_device_id kbd_ids[] = {
+        {
+                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+                .evbit = { BIT_MASK(EV_KEY) },
+        },
+
+        {
+                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+                .evbit = { BIT_MASK(EV_SND) },
+        },
+
+        { },    /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(input, kbd_ids);
+
+static struct input_handler kbd_handler = {
+        .event          = kbd_event,
+        .match          = kbd_match,
+        .connect        = kbd_connect,
+        .disconnect     = kbd_disconnect,
+        .start          = kbd_start,
+        .name           = "kbd",
+        .id_table       = kbd_ids,
+};
+
+int __init kbd_init(void)
+{
+        int i;
+        int error;
+
+        for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                kbd_table[i].ledflagstate = KBD_DEFLEDS;
+                kbd_table[i].default_ledflagstate = KBD_DEFLEDS;
+                kbd_table[i].ledmode = LED_SHOW_FLAGS;
+                kbd_table[i].lockstate = KBD_DEFLOCK;
+                kbd_table[i].slockstate = 0;
+                kbd_table[i].modeflags = KBD_DEFMODE;
+                kbd_table[i].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
+        }
+
+        error = input_register_handler(&kbd_handler);
+        if (error)
+                return error;
+
+        tasklet_enable(&keyboard_tasklet);
+        tasklet_schedule(&keyboard_tasklet);
+
+        return 0;
+}
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
new file mode 100644
index 000000000000..fb864e7fcd13
--- /dev/null
+++ b/drivers/tty/vt/selection.c
@@ -0,0 +1,345 @@
+/*
+ * This module exports the functions:
+ *
+ *     'int set_selection(struct tiocl_selection __user *, struct tty_struct *)'
+ *     'void clear_selection(void)'
+ *     'int paste_selection(struct tty_struct *)'
+ *     'int sel_loadlut(char __user *)'
+ *
+ * Now that /dev/vcs exists, most of this can disappear again.
+ */
+
+#include <linux/module.h>
+#include <linux/tty.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <asm/uaccess.h>
+
+#include <linux/kbd_kern.h>
+#include <linux/vt_kern.h>
+#include <linux/consolemap.h>
+#include <linux/selection.h>
+#include <linux/tiocl.h>
+#include <linux/console.h>
+
+/* Don't take this from <ctype.h>: 011-015 on the screen aren't spaces */
+#define isspace(c)      ((c) == ' ')
+
+extern void poke_blanked_console(void);
+
+/* Variables for selection control. */
+/* Use a dynamic buffer, instead of static (Dec 1994) */
+struct vc_data *sel_cons;               /* must not be deallocated */
+static int use_unicode;
+static volatile int sel_start = -1;     /* cleared by clear_selection */
+static int sel_end;
+static int sel_buffer_lth;
+static char *sel_buffer;
+
+/* clear_selection, highlight and highlight_pointer can be called
+   from interrupt (via scrollback/front) */
+
+/* set reverse video on characters s-e of console with selection. */
+static inline void highlight(const int s, const int e)
+{
+        invert_screen(sel_cons, s, e-s+2, 1);
+}
+
+/* use complementary color to show the pointer */
+static inline void highlight_pointer(const int where)
+{
+        complement_pos(sel_cons, where);
+}
+
+static u16
+sel_pos(int n)
+{
+        return inverse_translate(sel_cons, screen_glyph(sel_cons, n),
+                                use_unicode);
+}
+
+/* remove the current selection highlight, if any,
+   from the console holding the selection. */
+void
+clear_selection(void) {
+        highlight_pointer(-1); /* hide the pointer */
+        if (sel_start != -1) {
+                highlight(sel_start, sel_end);
+                sel_start = -1;
+        }
+}
+
+/*
+ * User settable table: what characters are to be considered alphabetic?
+ * 256 bits
+ */
+static u32 inwordLut[8]={
+  0x00000000, /* control chars     */
+  0x03FF0000, /* digits            */
+  0x87FFFFFE, /* uppercase and '_' */
+  0x07FFFFFE, /* lowercase         */
+  0x00000000,
+  0x00000000,
+  0xFF7FFFFF, /* latin-1 accented letters, not multiplication sign */
+  0xFF7FFFFF  /* latin-1 accented letters, not division sign */
+};
+
+static inline int inword(const u16 c) {
+        return c > 0xff || (( inwordLut[c>>5] >> (c & 0x1F) ) & 1);
+}
+
+/* set inwordLut contents. Invoked by ioctl(). */
+int sel_loadlut(char __user *p)
+{
+        return copy_from_user(inwordLut, (u32 __user *)(p+4), 32) ? -EFAULT : 0;
+}
+
+/* does screen address p correspond to character at LH/RH edge of screen? */
+static inline int atedge(const int p, int size_row)
+{
+        return (!(p % size_row) || !((p + 2) % size_row));
+}
+
+/* constrain v such that v <= u */
+static inline unsigned short limit(const unsigned short v, const unsigned short u)
+{
+        return (v > u) ? u : v;
+}
+
+/* stores the char in UTF8 and returns the number of bytes used (1-3) */
+static int store_utf8(u16 c, char *p)
+{
+        if (c < 0x80) {
+                /*  0******* */
+                p[0] = c;
+                return 1;
+        } else if (c < 0x800) {
+                /* 110***** 10****** */
+                p[0] = 0xc0 | (c >> 6);
+                p[1] = 0x80 | (c & 0x3f);
+                return 2;
+        } else {
+                /* 1110**** 10****** 10****** */
+                p[0] = 0xe0 | (c >> 12);
+                p[1] = 0x80 | ((c >> 6) & 0x3f);
+                p[2] = 0x80 | (c & 0x3f);
+                return 3;
+        }
+}
+
+/* set the current selection. Invoked by ioctl() or by kernel code. */
+int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *tty)
+{
+        struct vc_data *vc = vc_cons[fg_console].d;
+        int sel_mode, new_sel_start, new_sel_end, spc;
+        char *bp, *obp;
+        int i, ps, pe, multiplier;
+        u16 c;
+        struct kbd_struct *kbd = kbd_table + fg_console;
+
+        poke_blanked_console();
+
+        { unsigned short xs, ys, xe, ye;
+
+          if (!access_ok(VERIFY_READ, sel, sizeof(*sel)))
+                return -EFAULT;
+          __get_user(xs, &sel->xs);
+          __get_user(ys, &sel->ys);
+          __get_user(xe, &sel->xe);
+          __get_user(ye, &sel->ye);
+          __get_user(sel_mode, &sel->sel_mode);
+          xs--; ys--; xe--; ye--;
+          xs = limit(xs, vc->vc_cols - 1);
+          ys = limit(ys, vc->vc_rows - 1);
+          xe = limit(xe, vc->vc_cols - 1);
+          ye = limit(ye, vc->vc_rows - 1);
+          ps = ys * vc->vc_size_row + (xs << 1);
+          pe = ye * vc->vc_size_row + (xe << 1);
+
+          if (sel_mode == TIOCL_SELCLEAR) {
+              /* useful for screendump without selection highlights */
+              clear_selection();
+              return 0;
+          }
+
+          if (mouse_reporting() && (sel_mode & TIOCL_SELMOUSEREPORT)) {
+              mouse_report(tty, sel_mode & TIOCL_SELBUTTONMASK, xs, ys);
+              return 0;
+          }
+        }
+
+        if (ps > pe)    /* make sel_start <= sel_end */
+        {
+                int tmp = ps;
+                ps = pe;
+                pe = tmp;
+        }
+
+        if (sel_cons != vc_cons[fg_console].d) {
+                clear_selection();
+                sel_cons = vc_cons[fg_console].d;
+        }
+        use_unicode = kbd && kbd->kbdmode == VC_UNICODE;
+
+        switch (sel_mode)
+        {
+                case TIOCL_SELCHAR:     /* character-by-character selection */
+                        new_sel_start = ps;
+                        new_sel_end = pe;
+                        break;
+                case TIOCL_SELWORD:     /* word-by-word selection */
+                        spc = isspace(sel_pos(ps));
+                        for (new_sel_start = ps; ; ps -= 2)
+                        {
+                                if ((spc && !isspace(sel_pos(ps))) ||
+                                    (!spc && !inword(sel_pos(ps))))
+                                        break;
+                                new_sel_start = ps;
+                                if (!(ps % vc->vc_size_row))
+                                        break;
+                        }
+                        spc = isspace(sel_pos(pe));
+                        for (new_sel_end = pe; ; pe += 2)
+                        {
+                                if ((spc && !isspace(sel_pos(pe))) ||
+                                    (!spc && !inword(sel_pos(pe))))
+                                        break;
+                                new_sel_end = pe;
+                                if (!((pe + 2) % vc->vc_size_row))
+                                        break;
+                        }
+                        break;
+                case TIOCL_SELLINE:     /* line-by-line selection */
+                        new_sel_start = ps - ps % vc->vc_size_row;
+                        new_sel_end = pe + vc->vc_size_row
+                                    - pe % vc->vc_size_row - 2;
+                        break;
+                case TIOCL_SELPOINTER:
+                        highlight_pointer(pe);
+                        return 0;
+                default:
+                        return -EINVAL;
+        }
+
+        /* remove the pointer */
+        highlight_pointer(-1);
+
+        /* select to end of line if on trailing space */
+        if (new_sel_end > new_sel_start &&
+                !atedge(new_sel_end, vc->vc_size_row) &&
+                isspace(sel_pos(new_sel_end))) {
+                for (pe = new_sel_end + 2; ; pe += 2)
+                        if (!isspace(sel_pos(pe)) ||
+                            atedge(pe, vc->vc_size_row))
+                                break;
+                if (isspace(sel_pos(pe)))
+                        new_sel_end = pe;
+        }
+        if (sel_start == -1)    /* no current selection */
+                highlight(new_sel_start, new_sel_end);
+        else if (new_sel_start == sel_start)
+        {
+                if (new_sel_end == sel_end)     /* no action required */
+                        return 0;
+                else if (new_sel_end > sel_end) /* extend to right */
+                        highlight(sel_end + 2, new_sel_end);
+                else                            /* contract from right */
+                        highlight(new_sel_end + 2, sel_end);
+        }
+        else if (new_sel_end == sel_end)
+        {
+                if (new_sel_start < sel_start)  /* extend to left */
+                        highlight(new_sel_start, sel_start - 2);
+                else                            /* contract from left */
+                        highlight(sel_start, new_sel_start - 2);
+        }
+        else    /* some other case; start selection from scratch */
+        {
+                clear_selection();
+                highlight(new_sel_start, new_sel_end);
+        }
+        sel_start = new_sel_start;
+        sel_end = new_sel_end;
+
+        /* Allocate a new buffer before freeing the old one ... */
+        multiplier = use_unicode ? 3 : 1;  /* chars can take up to 3 bytes */
+        bp = kmalloc(((sel_end-sel_start)/2+1)*multiplier, GFP_KERNEL);
+        if (!bp) {
+                printk(KERN_WARNING "selection: kmalloc() failed\n");
+                clear_selection();
+                return -ENOMEM;
+        }
+        kfree(sel_buffer);
+        sel_buffer = bp;
+
+        obp = bp;
+        for (i = sel_start; i <= sel_end; i += 2) {
+                c = sel_pos(i);
+                if (use_unicode)
+                        bp += store_utf8(c, bp);
+                else
+                        *bp++ = c;
+                if (!isspace(c))
+                        obp = bp;
+                if (! ((i + 2) % vc->vc_size_row)) {
+                        /* strip trailing blanks from line and add newline,
+                           unless non-space at end of line. */
+                        if (obp != bp) {
+                                bp = obp;
+                                *bp++ = '\r';
+                        }
+                        obp = bp;
+                }
+        }
+        sel_buffer_lth = bp - sel_buffer;
+        return 0;
+}
+
+/* Insert the contents of the selection buffer into the
+ * queue of the tty associated with the current console.
+ * Invoked by ioctl().
+ */
+int paste_selection(struct tty_struct *tty)
+{
+        struct vc_data *vc = tty->driver_data;
+        int     pasted = 0;
+        unsigned int count;
+        struct  tty_ldisc *ld;
+        DECLARE_WAITQUEUE(wait, current);
+
+        /* always called with BTM from vt_ioctl */
+        WARN_ON(!tty_locked());
+
+        console_lock();
+        poke_blanked_console();
+        console_unlock();
+
+        ld = tty_ldisc_ref(tty);
+        if (!ld) {
+                tty_unlock();
+                ld = tty_ldisc_ref_wait(tty);
+                tty_lock();
+        }
+
+        add_wait_queue(&vc->paste_wait, &wait);
+        while (sel_buffer && sel_buffer_lth > pasted) {
+                set_current_state(TASK_INTERRUPTIBLE);
+                if (test_bit(TTY_THROTTLED, &tty->flags)) {
+                        schedule();
+                        continue;
+                }
+                count = sel_buffer_lth - pasted;
+                count = min(count, tty->receive_room);
+                tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted,
+                                                                NULL, count);
+                pasted += count;
+        }
+        remove_wait_queue(&vc->paste_wait, &wait);
+        __set_current_state(TASK_RUNNING);
+
+        tty_ldisc_deref(ld);
+        return 0;
+}
diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
new file mode 100644
index 000000000000..66825c9f516a
--- /dev/null
+++ b/drivers/tty/vt/vc_screen.c
@@ -0,0 +1,665 @@
+/*
+ * Provide access to virtual console memory.
+ * /dev/vcs0: the screen as it is being viewed right now (possibly scrolled)
+ * /dev/vcsN: the screen of /dev/ttyN (1 <= N <= 63)
+ *            [minor: N]
+ *
+ * /dev/vcsaN: idem, but including attributes, and prefixed with
+ *      the 4 bytes lines,columns,x,y (as screendump used to give).
+ *      Attribute/character pair is in native endianity.
+ *            [minor: N+128]
+ *
+ * This replaces screendump and part of selection, so that the system
+ * administrator can control access using file system permissions.
+ *
+ * aeb@cwi.nl - efter Friedas begravelse - 950211
+ *
+ * machek@k332.feld.cvut.cz - modified not to send characters to wrong console
+ *       - fixed some fatal off-by-one bugs (0-- no longer == -1 -> looping and looping and looping...)
+ *       - making it shorter - scr_readw are macros which expand in PRETTY long code
+ */
+
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/vt_kern.h>
+#include <linux/selection.h>
+#include <linux/kbd_kern.h>
+#include <linux/console.h>
+#include <linux/device.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/notifier.h>
+
+#include <asm/uaccess.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+
+#undef attr
+#undef org
+#undef addr
+#define HEADER_SIZE     4
+
+#define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE)
+
+struct vcs_poll_data {
+        struct notifier_block notifier;
+        unsigned int cons_num;
+        bool seen_last_update;
+        wait_queue_head_t waitq;
+        struct fasync_struct *fasync;
+};
+
+static int
+vcs_notifier(struct notifier_block *nb, unsigned long code, void *_param)
+{
+        struct vt_notifier_param *param = _param;
+        struct vc_data *vc = param->vc;
+        struct vcs_poll_data *poll =
+                container_of(nb, struct vcs_poll_data, notifier);
+        int currcons = poll->cons_num;
+
+        if (code != VT_UPDATE)
+                return NOTIFY_DONE;
+
+        if (currcons == 0)
+                currcons = fg_console;
+        else
+                currcons--;
+        if (currcons != vc->vc_num)
+                return NOTIFY_DONE;
+
+        poll->seen_last_update = false;
+        wake_up_interruptible(&poll->waitq);
+        kill_fasync(&poll->fasync, SIGIO, POLL_IN);
+        return NOTIFY_OK;
+}
+
+static void
+vcs_poll_data_free(struct vcs_poll_data *poll)
+{
+        unregister_vt_notifier(&poll->notifier);
+        kfree(poll);
+}
+
+static struct vcs_poll_data *
+vcs_poll_data_get(struct file *file)
+{
+        struct vcs_poll_data *poll = file->private_data;
+
+        if (poll)
+                return poll;
+
+        poll = kzalloc(sizeof(*poll), GFP_KERNEL);
+        if (!poll)
+                return NULL;
+        poll->cons_num = iminor(file->f_path.dentry->d_inode) & 127;
+        init_waitqueue_head(&poll->waitq);
+        poll->notifier.notifier_call = vcs_notifier;
+        if (register_vt_notifier(&poll->notifier) != 0) {
+                kfree(poll);
+                return NULL;
+        }
+
+        /*
+         * This code may be called either through ->poll() or ->fasync().
+         * If we have two threads using the same file descriptor, they could
+         * both enter this function, both notice that the structure hasn't
+         * been allocated yet and go ahead allocating it in parallel, but
+         * only one of them must survive and be shared otherwise we'd leak
+         * memory with a dangling notifier callback.
+         */
+        spin_lock(&file->f_lock);
+        if (!file->private_data) {
+                file->private_data = poll;
+        } else {
+                /* someone else raced ahead of us */
+                vcs_poll_data_free(poll);
+                poll = file->private_data;
+        }
+        spin_unlock(&file->f_lock);
+
+        return poll;
+}
+
+/*
+ * Returns VC for inode.
+ * Must be called with console_lock.
+ */
+static struct vc_data*
+vcs_vc(struct inode *inode, int *viewed)
+{
+        unsigned int currcons = iminor(inode) & 127;
+
+        WARN_CONSOLE_UNLOCKED();
+
+        if (currcons == 0) {
+                currcons = fg_console;
+                if (viewed)
+                        *viewed = 1;
+        } else {
+                currcons--;
+                if (viewed)
+                        *viewed = 0;
+        }
+        return vc_cons[currcons].d;
+}
+
+/*
+ * Returns size for VC carried by inode.
+ * Must be called with console_lock.
+ */
+static int
+vcs_size(struct inode *inode)
+{
+        int size;
+        int minor = iminor(inode);
+        struct vc_data *vc;
+
+        WARN_CONSOLE_UNLOCKED();
+
+        vc = vcs_vc(inode, NULL);
+        if (!vc)
+                return -ENXIO;
+
+        size = vc->vc_rows * vc->vc_cols;
+
+        if (minor & 128)
+                size = 2*size + HEADER_SIZE;
+        return size;
+}
+
+static loff_t vcs_lseek(struct file *file, loff_t offset, int orig)
+{
+        int size;
+
+        console_lock();
+        size = vcs_size(file->f_path.dentry->d_inode);
+        console_unlock();
+        if (size < 0)
+                return size;
+        switch (orig) {
+                default:
+                        return -EINVAL;
+                case 2:
+                        offset += size;
+                        break;
+                case 1:
+                        offset += file->f_pos;
+                case 0:
+                        break;
+        }
+        if (offset < 0 || offset > size) {
+                return -EINVAL;
+        }
+        file->f_pos = offset;
+        return file->f_pos;
+}
+
+
+static ssize_t
+vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        unsigned int currcons = iminor(inode);
+        struct vc_data *vc;
+        struct vcs_poll_data *poll;
+        long pos;
+        long attr, read;
+        int col, maxcol, viewed;
+        unsigned short *org = NULL;
+        ssize_t ret;
+        char *con_buf;
+
+        con_buf = (char *) __get_free_page(GFP_KERNEL);
+        if (!con_buf)
+                return -ENOMEM;
+
+        pos = *ppos;
+
+        /* Select the proper current console and verify
+         * sanity of the situation under the console lock.
+         */
+        console_lock();
+
+        attr = (currcons & 128);
+        ret = -ENXIO;
+        vc = vcs_vc(inode, &viewed);
+        if (!vc)
+                goto unlock_out;
+
+        ret = -EINVAL;
+        if (pos < 0)
+                goto unlock_out;
+        poll = file->private_data;
+        if (count && poll)
+                poll->seen_last_update = true;
+        read = 0;
+        ret = 0;
+        while (count) {
+                char *con_buf0, *con_buf_start;
+                long this_round, size;
+                ssize_t orig_count;
+                long p = pos;
+
+                /* Check whether we are above size each round,
+                 * as copy_to_user at the end of this loop
+                 * could sleep.
+                 */
+                size = vcs_size(inode);
+                if (size < 0) {
+                        if (read)
+                                break;
+                        ret = size;
+                        goto unlock_out;
+                }
+                if (pos >= size)
+                        break;
+                if (count > size - pos)
+                        count = size - pos;
+
+                this_round = count;
+                if (this_round > CON_BUF_SIZE)
+                        this_round = CON_BUF_SIZE;
+
+                /* Perform the whole read into the local con_buf.
+                 * Then we can drop the console spinlock and safely
+                 * attempt to move it to userspace.
+                 */
+
+                con_buf_start = con_buf0 = con_buf;
+                orig_count = this_round;
+                maxcol = vc->vc_cols;
+                if (!attr) {
+                        org = screen_pos(vc, p, viewed);
+                        col = p % maxcol;
+                        p += maxcol - col;
+                        while (this_round-- > 0) {
+                                *con_buf0++ = (vcs_scr_readw(vc, org++) & 0xff);
+                                if (++col == maxcol) {
+                                        org = screen_pos(vc, p, viewed);
+                                        col = 0;
+                                        p += maxcol;
+                                }
+                        }
+                } else {
+                        if (p < HEADER_SIZE) {
+                                size_t tmp_count;
+
+                                con_buf0[0] = (char)vc->vc_rows;
+                                con_buf0[1] = (char)vc->vc_cols;
+                                getconsxy(vc, con_buf0 + 2);
+
+                                con_buf_start += p;
+                                this_round += p;
+                                if (this_round > CON_BUF_SIZE) {
+                                        this_round = CON_BUF_SIZE;
+                                        orig_count = this_round - p;
+                                }
+
+                                tmp_count = HEADER_SIZE;
+                                if (tmp_count > this_round)
+                                        tmp_count = this_round;
+
+                                /* Advance state pointers and move on. */
+                                this_round -= tmp_count;
+                                p = HEADER_SIZE;
+                                con_buf0 = con_buf + HEADER_SIZE;
+                                /* If this_round >= 0, then p is even... */
+                        } else if (p & 1) {
+                                /* Skip first byte for output if start address is odd
+                                 * Update region sizes up/down depending on free
+                                 * space in buffer.
+                                 */
+                                con_buf_start++;
+                                if (this_round < CON_BUF_SIZE)
+                                        this_round++;
+                                else
+                                        orig_count--;
+                        }
+                        if (this_round > 0) {
+                                unsigned short *tmp_buf = (unsigned short *)con_buf0;
+
+                                p -= HEADER_SIZE;
+                                p /= 2;
+                                col = p % maxcol;
+
+                                org = screen_pos(vc, p, viewed);
+                                p += maxcol - col;
+
+                                /* Buffer has even length, so we can always copy
+                                 * character + attribute. We do not copy last byte
+                                 * to userspace if this_round is odd.
+                                 */
+                                this_round = (this_round + 1) >> 1;
+
+                                while (this_round) {
+                                        *tmp_buf++ = vcs_scr_readw(vc, org++);
+                                        this_round --;
+                                        if (++col == maxcol) {
+                                                org = screen_pos(vc, p, viewed);
+                                                col = 0;
+                                                p += maxcol;
+                                        }
+                                }
+                        }
+                }
+
+                /* Finally, release the console semaphore while we push
+                 * all the data to userspace from our temporary buffer.
+                 *
+                 * AKPM: Even though it's a semaphore, we should drop it because
+                 * the pagefault handling code may want to call printk().
+                 */
+
+                console_unlock();
+                ret = copy_to_user(buf, con_buf_start, orig_count);
+                console_lock();
+
+                if (ret) {
+                        read += (orig_count - ret);
+                        ret = -EFAULT;
+                        break;
+                }
+                buf += orig_count;
+                pos += orig_count;
+                read += orig_count;
+                count -= orig_count;
+        }
+        *ppos += read;
+        if (read)
+                ret = read;
+unlock_out:
+        console_unlock();
+        free_page((unsigned long) con_buf);
+        return ret;
+}
+
+static ssize_t
+vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        unsigned int currcons = iminor(inode);
+        struct vc_data *vc;
+        long pos;
+        long attr, size, written;
+        char *con_buf0;
+        int col, maxcol, viewed;
+        u16 *org0 = NULL, *org = NULL;
+        size_t ret;
+        char *con_buf;
+
+        con_buf = (char *) __get_free_page(GFP_KERNEL);
+        if (!con_buf)
+                return -ENOMEM;
+
+        pos = *ppos;
+
+        /* Select the proper current console and verify
+         * sanity of the situation under the console lock.
+         */
+        console_lock();
+
+        attr = (currcons & 128);
+        ret = -ENXIO;
+        vc = vcs_vc(inode, &viewed);
+        if (!vc)
+                goto unlock_out;
+
+        size = vcs_size(inode);
+        ret = -EINVAL;
+        if (pos < 0 || pos > size)
+                goto unlock_out;
+        if (count > size - pos)
+                count = size - pos;
+        written = 0;
+        while (count) {
+                long this_round = count;
+                size_t orig_count;
+                long p;
+
+                if (this_round > CON_BUF_SIZE)
+                        this_round = CON_BUF_SIZE;
+
+                /* Temporarily drop the console lock so that we can read
+                 * in the write data from userspace safely.
+                 */
+                console_unlock();
+                ret = copy_from_user(con_buf, buf, this_round);
+                console_lock();
+
+                if (ret) {
+                        this_round -= ret;
+                        if (!this_round) {
+                                /* Abort loop if no data were copied. Otherwise
+                                 * fail with -EFAULT.
+                                 */
+                                if (written)
+                                        break;
+                                ret = -EFAULT;
+                                goto unlock_out;
+                        }
+                }
+
+                /* The vcs_size might have changed while we slept to grab
+                 * the user buffer, so recheck.
+                 * Return data written up to now on failure.
+                 */
+                size = vcs_size(inode);
+                if (size < 0) {
+                        if (written)
+                                break;
+                        ret = size;
+                        goto unlock_out;
+                }
+                if (pos >= size)
+                        break;
+                if (this_round > size - pos)
+                        this_round = size - pos;
+
+                /* OK, now actually push the write to the console
+                 * under the lock using the local kernel buffer.
+                 */
+
+                con_buf0 = con_buf;
+                orig_count = this_round;
+                maxcol = vc->vc_cols;
+                p = pos;
+                if (!attr) {
+                        org0 = org = screen_pos(vc, p, viewed);
+                        col = p % maxcol;
+                        p += maxcol - col;
+
+                        while (this_round > 0) {
+                                unsigned char c = *con_buf0++;
+
+                                this_round--;
+                                vcs_scr_writew(vc,
+                                               (vcs_scr_readw(vc, org) & 0xff00) | c, org);
+                                org++;
+                                if (++col == maxcol) {
+                                        org = screen_pos(vc, p, viewed);
+                                        col = 0;
+                                        p += maxcol;
+                                }
+                        }
+                } else {
+                        if (p < HEADER_SIZE) {
+                                char header[HEADER_SIZE];
+
+                                getconsxy(vc, header + 2);
+                                while (p < HEADER_SIZE && this_round > 0) {
+                                        this_round--;
+                                        header[p++] = *con_buf0++;
+                                }
+                                if (!viewed)
+                                        putconsxy(vc, header + 2);
+                        }
+                        p -= HEADER_SIZE;
+                        col = (p/2) % maxcol;
+                        if (this_round > 0) {
+                                org0 = org = screen_pos(vc, p/2, viewed);
+                                if ((p & 1) && this_round > 0) {
+                                        char c;
+
+                                        this_round--;
+                                        c = *con_buf0++;
+#ifdef __BIG_ENDIAN
+                                        vcs_scr_writew(vc, c |
+                                             (vcs_scr_readw(vc, org) & 0xff00), org);
+#else
+                                        vcs_scr_writew(vc, (c << 8) |
+                                             (vcs_scr_readw(vc, org) & 0xff), org);
+#endif
+                                        org++;
+                                        p++;
+                                        if (++col == maxcol) {
+                                                org = screen_pos(vc, p/2, viewed);
+                                                col = 0;
+                                        }
+                                }
+                                p /= 2;
+                                p += maxcol - col;
+                        }
+                        while (this_round > 1) {
+                                unsigned short w;
+
+                                w = get_unaligned(((unsigned short *)con_buf0));
+                                vcs_scr_writew(vc, w, org++);
+                                con_buf0 += 2;
+                                this_round -= 2;
+                                if (++col == maxcol) {
+                                        org = screen_pos(vc, p, viewed);
+                                        col = 0;
+                                        p += maxcol;
+                                }
+                        }
+                        if (this_round > 0) {
+                                unsigned char c;
+
+                                c = *con_buf0++;
+#ifdef __BIG_ENDIAN
+                                vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff) | (c << 8), org);
+#else
+                                vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff00) | c, org);
+#endif
+                        }
+                }
+                count -= orig_count;
+                written += orig_count;
+                buf += orig_count;
+                pos += orig_count;
+                if (org0)
+                        update_region(vc, (unsigned long)(org0), org - org0);
+        }
+        *ppos += written;
+        ret = written;
+        if (written)
+                vcs_scr_updated(vc);
+
+unlock_out:
+        console_unlock();
+        free_page((unsigned long) con_buf);
+        return ret;
+}
+
+static unsigned int
+vcs_poll(struct file *file, poll_table *wait)
+{
+        struct vcs_poll_data *poll = vcs_poll_data_get(file);
+        int ret = DEFAULT_POLLMASK|POLLERR|POLLPRI;
+
+        if (poll) {
+                poll_wait(file, &poll->waitq, wait);
+                if (poll->seen_last_update)
+                        ret = DEFAULT_POLLMASK;
+        }
+        return ret;
+}
+
+static int
+vcs_fasync(int fd, struct file *file, int on)
+{
+        struct vcs_poll_data *poll = file->private_data;
+
+        if (!poll) {
+                /* don't allocate anything if all we want is disable fasync */
+                if (!on)
+                        return 0;
+                poll = vcs_poll_data_get(file);
+                if (!poll)
+                        return -ENOMEM;
+        }
+
+        return fasync_helper(fd, file, on, &poll->fasync);
+}
+
+static int
+vcs_open(struct inode *inode, struct file *filp)
+{
+        unsigned int currcons = iminor(inode) & 127;
+        int ret = 0;
+        
+        tty_lock();
+        if(currcons && !vc_cons_allocated(currcons-1))
+                ret = -ENXIO;
+        tty_unlock();
+        return ret;
+}
+
+static int vcs_release(struct inode *inode, struct file *file)
+{
+        struct vcs_poll_data *poll = file->private_data;
+
+        if (poll)
+                vcs_poll_data_free(poll);
+        return 0;
+}
+
+static const struct file_operations vcs_fops = {
+        .llseek         = vcs_lseek,
+        .read           = vcs_read,
+        .write          = vcs_write,
+        .poll           = vcs_poll,
+        .fasync         = vcs_fasync,
+        .open           = vcs_open,
+        .release        = vcs_release,
+};
+
+static struct class *vc_class;
+
+void vcs_make_sysfs(int index)
+{
+        device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 1), NULL,
+                      "vcs%u", index + 1);
+        device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 129), NULL,
+                      "vcsa%u", index + 1);
+}
+
+void vcs_remove_sysfs(int index)
+{
+        device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 1));
+        device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 129));
+}
+
+int __init vcs_init(void)
+{
+        unsigned int i;
+
+        if (register_chrdev(VCS_MAJOR, "vcs", &vcs_fops))
+                panic("unable to get major %d for vcs device", VCS_MAJOR);
+        vc_class = class_create(THIS_MODULE, "vc");
+
+        device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 0), NULL, "vcs");
+        device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 128), NULL, "vcsa");
+        for (i = 0; i < MIN_NR_CONSOLES; i++)
+                vcs_make_sysfs(i);
+        return 0;
+}
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
new file mode 100644
index 000000000000..b3915b7ad3e2
--- /dev/null
+++ b/drivers/tty/vt/vt.c
@@ -0,0 +1,4226 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+/*
+ * Hopefully this will be a rather complete VT102 implementation.
+ *
+ * Beeping thanks to John T Kohl.
+ *
+ * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
+ *   Chars, and VT100 enhancements by Peter MacDonald.
+ *
+ * Copy and paste function by Andrew Haylett,
+ *   some enhancements by Alessandro Rubini.
+ *
+ * Code to check for different video-cards mostly by Galen Hunt,
+ * <g-hunt@ee.utah.edu>
+ *
+ * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
+ * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
+ *
+ * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
+ * Resizing of consoles, aeb, 940926
+ *
+ * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
+ * <poe@daimi.aau.dk>
+ *
+ * User-defined bell sound, new setterm control sequences and printk
+ * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
+ *
+ * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
+ *
+ * Merge with the abstract console driver by Geert Uytterhoeven
+ * <geert@linux-m68k.org>, Jan 1997.
+ *
+ *   Original m68k console driver modifications by
+ *
+ *     - Arno Griffioen <arno@usn.nl>
+ *     - David Carter <carter@cs.bris.ac.uk>
+ * 
+ *   The abstract console driver provides a generic interface for a text
+ *   console. It supports VGA text mode, frame buffer based graphical consoles
+ *   and special graphics processors that are only accessible through some
+ *   registers (e.g. a TMS340x0 GSP).
+ *
+ *   The interface to the hardware is specified using a special structure
+ *   (struct consw) which contains function pointers to console operations
+ *   (see <linux/console.h> for more information).
+ *
+ * Support for changeable cursor shape
+ * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
+ *
+ * Ported to i386 and con_scrolldelta fixed
+ * by Emmanuel Marty <core@ggi-project.org>, April 1998
+ *
+ * Resurrected character buffers in videoram plus lots of other trickery
+ * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
+ *
+ * Removed old-style timers, introduced console_timer, made timer
+ * deletion SMP-safe.  17Jun00, Andrew Morton
+ *
+ * Removed console_lock, enabled interrupts across all console operations
+ * 13 March 2001, Andrew Morton
+ *
+ * Fixed UTF-8 mode so alternate charset modes always work according
+ * to control sequences interpreted in do_con_trol function
+ * preserving backward VT100 semigraphics compatibility,
+ * malformed UTF sequences represented as sequences of replacement glyphs,
+ * original codes or '?' as a last resort if replacement glyph is undefined
+ * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/kd.h>
+#include <linux/slab.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/vt_kern.h>
+#include <linux/selection.h>
+#include <linux/tiocl.h>
+#include <linux/kbd_kern.h>
+#include <linux/consolemap.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/pm.h>
+#include <linux/font.h>
+#include <linux/bitops.h>
+#include <linux/notifier.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <asm/system.h>
+#include <linux/uaccess.h>
+#include <linux/kdb.h>
+#include <linux/ctype.h>
+
+#define MAX_NR_CON_DRIVER 16
+
+#define CON_DRIVER_FLAG_MODULE 1
+#define CON_DRIVER_FLAG_INIT   2
+#define CON_DRIVER_FLAG_ATTR   4
+
+struct con_driver {
+        const struct consw *con;
+        const char *desc;
+        struct device *dev;
+        int node;
+        int first;
+        int last;
+        int flag;
+};
+
+static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
+const struct consw *conswitchp;
+
+/* A bitmap for codes <32. A bit of 1 indicates that the code
+ * corresponding to that bit number invokes some special action
+ * (such as cursor movement) and should not be displayed as a
+ * glyph unless the disp_ctrl mode is explicitly enabled.
+ */
+#define CTRL_ACTION 0x0d00ff81
+#define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
+
+/*
+ * Here is the default bell parameters: 750HZ, 1/8th of a second
+ */
+#define DEFAULT_BELL_PITCH      750
+#define DEFAULT_BELL_DURATION   (HZ/8)
+
+struct vc vc_cons [MAX_NR_CONSOLES];
+
+#ifndef VT_SINGLE_DRIVER
+static const struct consw *con_driver_map[MAX_NR_CONSOLES];
+#endif
+
+static int con_open(struct tty_struct *, struct file *);
+static void vc_init(struct vc_data *vc, unsigned int rows,
+                    unsigned int cols, int do_clear);
+static void gotoxy(struct vc_data *vc, int new_x, int new_y);
+static void save_cur(struct vc_data *vc);
+static void reset_terminal(struct vc_data *vc, int do_clear);
+static void con_flush_chars(struct tty_struct *tty);
+static int set_vesa_blanking(char __user *p);
+static void set_cursor(struct vc_data *vc);
+static void hide_cursor(struct vc_data *vc);
+static void console_callback(struct work_struct *ignored);
+static void blank_screen_t(unsigned long dummy);
+static void set_palette(struct vc_data *vc);
+
+static int printable;           /* Is console ready for printing? */
+int default_utf8 = true;
+module_param(default_utf8, int, S_IRUGO | S_IWUSR);
+int global_cursor_default = -1;
+module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
+
+static int cur_default = CUR_DEFAULT;
+module_param(cur_default, int, S_IRUGO | S_IWUSR);
+
+/*
+ * ignore_poke: don't unblank the screen when things are typed.  This is
+ * mainly for the privacy of braille terminal users.
+ */
+static int ignore_poke;
+
+int do_poke_blanked_console;
+int console_blanked;
+
+static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
+static int vesa_off_interval;
+static int blankinterval = 10*60;
+core_param(consoleblank, blankinterval, int, 0444);
+
+static DECLARE_WORK(console_work, console_callback);
+
+/*
+ * fg_console is the current virtual console,
+ * last_console is the last used one,
+ * want_console is the console we want to switch to,
+ * saved_* variants are for save/restore around kernel debugger enter/leave
+ */
+int fg_console;
+int last_console;
+int want_console = -1;
+static int saved_fg_console;
+static int saved_last_console;
+static int saved_want_console;
+static int saved_vc_mode;
+static int saved_console_blanked;
+
+/*
+ * For each existing display, we have a pointer to console currently visible
+ * on that display, allowing consoles other than fg_console to be refreshed
+ * appropriately. Unless the low-level driver supplies its own display_fg
+ * variable, we use this one for the "master display".
+ */
+static struct vc_data *master_display_fg;
+
+/*
+ * Unfortunately, we need to delay tty echo when we're currently writing to the
+ * console since the code is (and always was) not re-entrant, so we schedule
+ * all flip requests to process context with schedule-task() and run it from
+ * console_callback().
+ */
+
+/*
+ * For the same reason, we defer scrollback to the console callback.
+ */
+static int scrollback_delta;
+
+/*
+ * Hook so that the power management routines can (un)blank
+ * the console on our behalf.
+ */
+int (*console_blank_hook)(int);
+
+static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
+static int blank_state;
+static int blank_timer_expired;
+enum {
+        blank_off = 0,
+        blank_normal_wait,
+        blank_vesa_wait,
+};
+
+/*
+ * /sys/class/tty/tty0/
+ *
+ * the attribute 'active' contains the name of the current vc
+ * console and it supports poll() to detect vc switches
+ */
+static struct device *tty0dev;
+
+/*
+ * Notifier list for console events.
+ */
+static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
+
+int register_vt_notifier(struct notifier_block *nb)
+{
+        return atomic_notifier_chain_register(&vt_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_vt_notifier);
+
+int unregister_vt_notifier(struct notifier_block *nb)
+{
+        return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_vt_notifier);
+
+static void notify_write(struct vc_data *vc, unsigned int unicode)
+{
+        struct vt_notifier_param param = { .vc = vc, unicode = unicode };
+        atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
+}
+
+static void notify_update(struct vc_data *vc)
+{
+        struct vt_notifier_param param = { .vc = vc };
+        atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
+}
+/*
+ *      Low-Level Functions
+ */
+
+#define IS_FG(vc)       ((vc)->vc_num == fg_console)
+
+#ifdef VT_BUF_VRAM_ONLY
+#define DO_UPDATE(vc)   0
+#else
+#define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
+#endif
+
+static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
+{
+        unsigned short *p;
+        
+        if (!viewed)
+                p = (unsigned short *)(vc->vc_origin + offset);
+        else if (!vc->vc_sw->con_screen_pos)
+                p = (unsigned short *)(vc->vc_visible_origin + offset);
+        else
+                p = vc->vc_sw->con_screen_pos(vc, offset);
+        return p;
+}
+
+/* Called  from the keyboard irq path.. */
+static inline void scrolldelta(int lines)
+{
+        /* FIXME */
+        /* scrolldelta needs some kind of consistency lock, but the BKL was
+           and still is not protecting versus the scheduled back end */
+        scrollback_delta += lines;
+        schedule_console_callback();
+}
+
+void schedule_console_callback(void)
+{
+        schedule_work(&console_work);
+}
+
+static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
+{
+        unsigned short *d, *s;
+
+        if (t+nr >= b)
+                nr = b - t - 1;
+        if (b > vc->vc_rows || t >= b || nr < 1)
+                return;
+        if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
+                return;
+        d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
+        s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
+        scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
+        scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
+                    vc->vc_size_row * nr);
+}
+
+static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
+{
+        unsigned short *s;
+        unsigned int step;
+
+        if (t+nr >= b)
+                nr = b - t - 1;
+        if (b > vc->vc_rows || t >= b || nr < 1)
+                return;
+        if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
+                return;
+        s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
+        step = vc->vc_cols * nr;
+        scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
+        scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
+}
+
+static void do_update_region(struct vc_data *vc, unsigned long start, int count)
+{
+#ifndef VT_BUF_VRAM_ONLY
+        unsigned int xx, yy, offset;
+        u16 *p;
+
+        p = (u16 *) start;
+        if (!vc->vc_sw->con_getxy) {
+                offset = (start - vc->vc_origin) / 2;
+                xx = offset % vc->vc_cols;
+                yy = offset / vc->vc_cols;
+        } else {
+                int nxx, nyy;
+                start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
+                xx = nxx; yy = nyy;
+        }
+        for(;;) {
+                u16 attrib = scr_readw(p) & 0xff00;
+                int startx = xx;
+                u16 *q = p;
+                while (xx < vc->vc_cols && count) {
+                        if (attrib != (scr_readw(p) & 0xff00)) {
+                                if (p > q)
+                                        vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
+                                startx = xx;
+                                q = p;
+                                attrib = scr_readw(p) & 0xff00;
+                        }
+                        p++;
+                        xx++;
+                        count--;
+                }
+                if (p > q)
+                        vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
+                if (!count)
+                        break;
+                xx = 0;
+                yy++;
+                if (vc->vc_sw->con_getxy) {
+                        p = (u16 *)start;
+                        start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
+                }
+        }
+#endif
+}
+
+void update_region(struct vc_data *vc, unsigned long start, int count)
+{
+        WARN_CONSOLE_UNLOCKED();
+
+        if (DO_UPDATE(vc)) {
+                hide_cursor(vc);
+                do_update_region(vc, start, count);
+                set_cursor(vc);
+        }
+}
+
+/* Structure of attributes is hardware-dependent */
+
+static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
+    u8 _underline, u8 _reverse, u8 _italic)
+{
+        if (vc->vc_sw->con_build_attr)
+                return vc->vc_sw->con_build_attr(vc, _color, _intensity,
+                       _blink, _underline, _reverse, _italic);
+
+#ifndef VT_BUF_VRAM_ONLY
+/*
+ * ++roman: I completely changed the attribute format for monochrome
+ * mode (!can_do_color). The formerly used MDA (monochrome display
+ * adapter) format didn't allow the combination of certain effects.
+ * Now the attribute is just a bit vector:
+ *  Bit 0..1: intensity (0..2)
+ *  Bit 2   : underline
+ *  Bit 3   : reverse
+ *  Bit 7   : blink
+ */
+        {
+        u8 a = _color;
+        if (!vc->vc_can_do_color)
+                return _intensity |
+                       (_italic ? 2 : 0) |
+                       (_underline ? 4 : 0) |
+                       (_reverse ? 8 : 0) |
+                       (_blink ? 0x80 : 0);
+        if (_italic)
+                a = (a & 0xF0) | vc->vc_itcolor;
+        else if (_underline)
+                a = (a & 0xf0) | vc->vc_ulcolor;
+        else if (_intensity == 0)
+                a = (a & 0xf0) | vc->vc_ulcolor;
+        if (_reverse)
+                a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
+        if (_blink)
+                a ^= 0x80;
+        if (_intensity == 2)
+                a ^= 0x08;
+        if (vc->vc_hi_font_mask == 0x100)
+                a <<= 1;
+        return a;
+        }
+#else
+        return 0;
+#endif
+}
+
+static void update_attr(struct vc_data *vc)
+{
+        vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
+                      vc->vc_blink, vc->vc_underline,
+                      vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
+        vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
+}
+
+/* Note: inverting the screen twice should revert to the original state */
+void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
+{
+        unsigned short *p;
+
+        WARN_CONSOLE_UNLOCKED();
+
+        count /= 2;
+        p = screenpos(vc, offset, viewed);
+        if (vc->vc_sw->con_invert_region)
+                vc->vc_sw->con_invert_region(vc, p, count);
+#ifndef VT_BUF_VRAM_ONLY
+        else {
+                u16 *q = p;
+                int cnt = count;
+                u16 a;
+
+                if (!vc->vc_can_do_color) {
+                        while (cnt--) {
+                            a = scr_readw(q);
+                            a ^= 0x0800;
+                            scr_writew(a, q);
+                            q++;
+                        }
+                } else if (vc->vc_hi_font_mask == 0x100) {
+                        while (cnt--) {
+                                a = scr_readw(q);
+                                a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
+                                scr_writew(a, q);
+                                q++;
+                        }
+                } else {
+                        while (cnt--) {
+                                a = scr_readw(q);
+                                a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
+                                scr_writew(a, q);
+                                q++;
+                        }
+                }
+        }
+#endif
+        if (DO_UPDATE(vc))
+                do_update_region(vc, (unsigned long) p, count);
+}
+
+/* used by selection: complement pointer position */
+void complement_pos(struct vc_data *vc, int offset)
+{
+        static int old_offset = -1;
+        static unsigned short old;
+        static unsigned short oldx, oldy;
+
+        WARN_CONSOLE_UNLOCKED();
+
+        if (old_offset != -1 && old_offset >= 0 &&
+            old_offset < vc->vc_screenbuf_size) {
+                scr_writew(old, screenpos(vc, old_offset, 1));
+                if (DO_UPDATE(vc))
+                        vc->vc_sw->con_putc(vc, old, oldy, oldx);
+        }
+
+        old_offset = offset;
+
+        if (offset != -1 && offset >= 0 &&
+            offset < vc->vc_screenbuf_size) {
+                unsigned short new;
+                unsigned short *p;
+                p = screenpos(vc, offset, 1);
+                old = scr_readw(p);
+                new = old ^ vc->vc_complement_mask;
+                scr_writew(new, p);
+                if (DO_UPDATE(vc)) {
+                        oldx = (offset >> 1) % vc->vc_cols;
+                        oldy = (offset >> 1) / vc->vc_cols;
+                        vc->vc_sw->con_putc(vc, new, oldy, oldx);
+                }
+        }
+
+}
+
+static void insert_char(struct vc_data *vc, unsigned int nr)
+{
+        unsigned short *p, *q = (unsigned short *)vc->vc_pos;
+
+        p = q + vc->vc_cols - nr - vc->vc_x;
+        while (--p >= q)
+                scr_writew(scr_readw(p), p + nr);
+        scr_memsetw(q, vc->vc_video_erase_char, nr * 2);
+        vc->vc_need_wrap = 0;
+        if (DO_UPDATE(vc)) {
+                unsigned short oldattr = vc->vc_attr;
+                vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x, vc->vc_y, vc->vc_x + nr, 1,
+                                     vc->vc_cols - vc->vc_x - nr);
+                vc->vc_attr = vc->vc_video_erase_char >> 8;
+                while (nr--)
+                        vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y, vc->vc_x + nr);
+                vc->vc_attr = oldattr;
+        }
+}
+
+static void delete_char(struct vc_data *vc, unsigned int nr)
+{
+        unsigned int i = vc->vc_x;
+        unsigned short *p = (unsigned short *)vc->vc_pos;
+
+        while (++i <= vc->vc_cols - nr) {
+                scr_writew(scr_readw(p+nr), p);
+                p++;
+        }
+        scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
+        vc->vc_need_wrap = 0;
+        if (DO_UPDATE(vc)) {
+                unsigned short oldattr = vc->vc_attr;
+                vc->vc_sw->con_bmove(vc, vc->vc_y, vc->vc_x + nr, vc->vc_y, vc->vc_x, 1,
+                                     vc->vc_cols - vc->vc_x - nr);
+                vc->vc_attr = vc->vc_video_erase_char >> 8;
+                while (nr--)
+                        vc->vc_sw->con_putc(vc, vc->vc_video_erase_char, vc->vc_y,
+                                     vc->vc_cols - 1 - nr);
+                vc->vc_attr = oldattr;
+        }
+}
+
+static int softcursor_original;
+
+static void add_softcursor(struct vc_data *vc)
+{
+        int i = scr_readw((u16 *) vc->vc_pos);
+        u32 type = vc->vc_cursor_type;
+
+        if (! (type & 0x10)) return;
+        if (softcursor_original != -1) return;
+        softcursor_original = i;
+        i |= ((type >> 8) & 0xff00 );
+        i ^= ((type) & 0xff00 );
+        if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
+        if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
+        scr_writew(i, (u16 *) vc->vc_pos);
+        if (DO_UPDATE(vc))
+                vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
+}
+
+static void hide_softcursor(struct vc_data *vc)
+{
+        if (softcursor_original != -1) {
+                scr_writew(softcursor_original, (u16 *)vc->vc_pos);
+                if (DO_UPDATE(vc))
+                        vc->vc_sw->con_putc(vc, softcursor_original,
+                                        vc->vc_y, vc->vc_x);
+                softcursor_original = -1;
+        }
+}
+
+static void hide_cursor(struct vc_data *vc)
+{
+        if (vc == sel_cons)
+                clear_selection();
+        vc->vc_sw->con_cursor(vc, CM_ERASE);
+        hide_softcursor(vc);
+}
+
+static void set_cursor(struct vc_data *vc)
+{
+        if (!IS_FG(vc) || console_blanked ||
+            vc->vc_mode == KD_GRAPHICS)
+                return;
+        if (vc->vc_deccm) {
+                if (vc == sel_cons)
+                        clear_selection();
+                add_softcursor(vc);
+                if ((vc->vc_cursor_type & 0x0f) != 1)
+                        vc->vc_sw->con_cursor(vc, CM_DRAW);
+        } else
+                hide_cursor(vc);
+}
+
+static void set_origin(struct vc_data *vc)
+{
+        WARN_CONSOLE_UNLOCKED();
+
+        if (!CON_IS_VISIBLE(vc) ||
+            !vc->vc_sw->con_set_origin ||
+            !vc->vc_sw->con_set_origin(vc))
+                vc->vc_origin = (unsigned long)vc->vc_screenbuf;
+        vc->vc_visible_origin = vc->vc_origin;
+        vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
+        vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
+}
+
+static inline void save_screen(struct vc_data *vc)
+{
+        WARN_CONSOLE_UNLOCKED();
+
+        if (vc->vc_sw->con_save_screen)
+                vc->vc_sw->con_save_screen(vc);
+}
+
+/*
+ *      Redrawing of screen
+ */
+
+static void clear_buffer_attributes(struct vc_data *vc)
+{
+        unsigned short *p = (unsigned short *)vc->vc_origin;
+        int count = vc->vc_screenbuf_size / 2;
+        int mask = vc->vc_hi_font_mask | 0xff;
+
+        for (; count > 0; count--, p++) {
+                scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
+        }
+}
+
+void redraw_screen(struct vc_data *vc, int is_switch)
+{
+        int redraw = 0;
+
+        WARN_CONSOLE_UNLOCKED();
+
+        if (!vc) {
+                /* strange ... */
+                /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
+                return;
+        }
+
+        if (is_switch) {
+                struct vc_data *old_vc = vc_cons[fg_console].d;
+                if (old_vc == vc)
+                        return;
+                if (!CON_IS_VISIBLE(vc))
+                        redraw = 1;
+                *vc->vc_display_fg = vc;
+                fg_console = vc->vc_num;
+                hide_cursor(old_vc);
+                if (!CON_IS_VISIBLE(old_vc)) {
+                        save_screen(old_vc);
+                        set_origin(old_vc);
+                }
+                if (tty0dev)
+                        sysfs_notify(&tty0dev->kobj, NULL, "active");
+        } else {
+                hide_cursor(vc);
+                redraw = 1;
+        }
+
+        if (redraw) {
+                int update;
+                int old_was_color = vc->vc_can_do_color;
+
+                set_origin(vc);
+                update = vc->vc_sw->con_switch(vc);
+                set_palette(vc);
+                /*
+                 * If console changed from mono<->color, the best we can do
+                 * is to clear the buffer attributes. As it currently stands,
+                 * rebuilding new attributes from the old buffer is not doable
+                 * without overly complex code.
+                 */
+                if (old_was_color != vc->vc_can_do_color) {
+                        update_attr(vc);
+                        clear_buffer_attributes(vc);
+                }
+
+                /* Forcibly update if we're panicing */
+                if ((update && vc->vc_mode != KD_GRAPHICS) ||
+                    vt_force_oops_output(vc))
+                        do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
+        }
+        set_cursor(vc);
+        if (is_switch) {
+                set_leds();
+                compute_shiftstate();
+                notify_update(vc);
+        }
+}
+
+/*
+ *      Allocation, freeing and resizing of VTs.
+ */
+
+int vc_cons_allocated(unsigned int i)
+{
+        return (i < MAX_NR_CONSOLES && vc_cons[i].d);
+}
+
+static void visual_init(struct vc_data *vc, int num, int init)
+{
+        /* ++Geert: vc->vc_sw->con_init determines console size */
+        if (vc->vc_sw)
+                module_put(vc->vc_sw->owner);
+        vc->vc_sw = conswitchp;
+#ifndef VT_SINGLE_DRIVER
+        if (con_driver_map[num])
+                vc->vc_sw = con_driver_map[num];
+#endif
+        __module_get(vc->vc_sw->owner);
+        vc->vc_num = num;
+        vc->vc_display_fg = &master_display_fg;
+        vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
+        vc->vc_uni_pagedir = 0;
+        vc->vc_hi_font_mask = 0;
+        vc->vc_complement_mask = 0;
+        vc->vc_can_do_color = 0;
+        vc->vc_panic_force_write = false;
+        vc->vc_sw->con_init(vc, init);
+        if (!vc->vc_complement_mask)
+                vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
+        vc->vc_s_complement_mask = vc->vc_complement_mask;
+        vc->vc_size_row = vc->vc_cols << 1;
+        vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
+}
+
+int vc_allocate(unsigned int currcons)  /* return 0 on success */
+{
+        WARN_CONSOLE_UNLOCKED();
+
+        if (currcons >= MAX_NR_CONSOLES)
+                return -ENXIO;
+        if (!vc_cons[currcons].d) {
+            struct vc_data *vc;
+            struct vt_notifier_param param;
+
+            /* prevent users from taking too much memory */
+            if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
+              return -EPERM;
+
+            /* due to the granularity of kmalloc, we waste some memory here */
+            /* the alloc is done in two steps, to optimize the common situation
+               of a 25x80 console (structsize=216, screenbuf_size=4000) */
+            /* although the numbers above are not valid since long ago, the
+               point is still up-to-date and the comment still has its value
+               even if only as a historical artifact.  --mj, July 1998 */
+            param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
+            if (!vc)
+                return -ENOMEM;
+            vc_cons[currcons].d = vc;
+            tty_port_init(&vc->port);
+            INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+            visual_init(vc, currcons, 1);
+            if (!*vc->vc_uni_pagedir_loc)
+                con_set_default_unimap(vc);
+            vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
+            if (!vc->vc_screenbuf) {
+                kfree(vc);
+                vc_cons[currcons].d = NULL;
+                return -ENOMEM;
+            }
+
+            /* If no drivers have overridden us and the user didn't pass a
+               boot option, default to displaying the cursor */
+            if (global_cursor_default == -1)
+                    global_cursor_default = 1;
+
+            vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
+            vcs_make_sysfs(currcons);
+            atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
+        }
+        return 0;
+}
+
+static inline int resize_screen(struct vc_data *vc, int width, int height,
+                                int user)
+{
+        /* Resizes the resolution of the display adapater */
+        int err = 0;
+
+        if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
+                err = vc->vc_sw->con_resize(vc, width, height, user);
+
+        return err;
+}
+
+/*
+ * Change # of rows and columns (0 means unchanged/the size of fg_console)
+ * [this is to be used together with some user program
+ * like resize that changes the hardware videomode]
+ */
+#define VC_RESIZE_MAXCOL (32767)
+#define VC_RESIZE_MAXROW (32767)
+
+/**
+ *      vc_do_resize    -       resizing method for the tty
+ *      @tty: tty being resized
+ *      @real_tty: real tty (different to tty if a pty/tty pair)
+ *      @vc: virtual console private data
+ *      @cols: columns
+ *      @lines: lines
+ *
+ *      Resize a virtual console, clipping according to the actual constraints.
+ *      If the caller passes a tty structure then update the termios winsize
+ *      information and perform any necessary signal handling.
+ *
+ *      Caller must hold the console semaphore. Takes the termios mutex and
+ *      ctrl_lock of the tty IFF a tty is passed.
+ */
+
+static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
+                                unsigned int cols, unsigned int lines)
+{
+        unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
+        unsigned long end;
+        unsigned int old_rows, old_row_size;
+        unsigned int new_cols, new_rows, new_row_size, new_screen_size;
+        unsigned int user;
+        unsigned short *newscreen;
+
+        WARN_CONSOLE_UNLOCKED();
+
+        if (!vc)
+                return -ENXIO;
+
+        user = vc->vc_resize_user;
+        vc->vc_resize_user = 0;
+
+        if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
+                return -EINVAL;
+
+        new_cols = (cols ? cols : vc->vc_cols);
+        new_rows = (lines ? lines : vc->vc_rows);
+        new_row_size = new_cols << 1;
+        new_screen_size = new_row_size * new_rows;
+
+        if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
+                return 0;
+
+        newscreen = kmalloc(new_screen_size, GFP_USER);
+        if (!newscreen)
+                return -ENOMEM;
+
+        old_rows = vc->vc_rows;
+        old_row_size = vc->vc_size_row;
+
+        err = resize_screen(vc, new_cols, new_rows, user);
+        if (err) {
+                kfree(newscreen);
+                return err;
+        }
+
+        vc->vc_rows = new_rows;
+        vc->vc_cols = new_cols;
+        vc->vc_size_row = new_row_size;
+        vc->vc_screenbuf_size = new_screen_size;
+
+        rlth = min(old_row_size, new_row_size);
+        rrem = new_row_size - rlth;
+        old_origin = vc->vc_origin;
+        new_origin = (long) newscreen;
+        new_scr_end = new_origin + new_screen_size;
+
+        if (vc->vc_y > new_rows) {
+                if (old_rows - vc->vc_y < new_rows) {
+                        /*
+                         * Cursor near the bottom, copy contents from the
+                         * bottom of buffer
+                         */
+                        old_origin += (old_rows - new_rows) * old_row_size;
+                } else {
+                        /*
+                         * Cursor is in no man's land, copy 1/2 screenful
+                         * from the top and bottom of cursor position
+                         */
+                        old_origin += (vc->vc_y - new_rows/2) * old_row_size;
+                }
+        }
+
+        end = old_origin + old_row_size * min(old_rows, new_rows);
+
+        update_attr(vc);
+
+        while (old_origin < end) {
+                scr_memcpyw((unsigned short *) new_origin,
+                            (unsigned short *) old_origin, rlth);
+                if (rrem)
+                        scr_memsetw((void *)(new_origin + rlth),
+                                    vc->vc_video_erase_char, rrem);
+                old_origin += old_row_size;
+                new_origin += new_row_size;
+        }
+        if (new_scr_end > new_origin)
+                scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
+                            new_scr_end - new_origin);
+        kfree(vc->vc_screenbuf);
+        vc->vc_screenbuf = newscreen;
+        vc->vc_screenbuf_size = new_screen_size;
+        set_origin(vc);
+
+        /* do part of a reset_terminal() */
+        vc->vc_top = 0;
+        vc->vc_bottom = vc->vc_rows;
+        gotoxy(vc, vc->vc_x, vc->vc_y);
+        save_cur(vc);
+
+        if (tty) {
+                /* Rewrite the requested winsize data with the actual
+                   resulting sizes */
+                struct winsize ws;
+                memset(&ws, 0, sizeof(ws));
+                ws.ws_row = vc->vc_rows;
+                ws.ws_col = vc->vc_cols;
+                ws.ws_ypixel = vc->vc_scan_lines;
+                tty_do_resize(tty, &ws);
+        }
+
+        if (CON_IS_VISIBLE(vc))
+                update_screen(vc);
+        vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
+        return err;
+}
+
+/**
+ *      vc_resize               -       resize a VT
+ *      @vc: virtual console
+ *      @cols: columns
+ *      @rows: rows
+ *
+ *      Resize a virtual console as seen from the console end of things. We
+ *      use the common vc_do_resize methods to update the structures. The
+ *      caller must hold the console sem to protect console internals and
+ *      vc->port.tty
+ */
+
+int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
+{
+        return vc_do_resize(vc->port.tty, vc, cols, rows);
+}
+
+/**
+ *      vt_resize               -       resize a VT
+ *      @tty: tty to resize
+ *      @ws: winsize attributes
+ *
+ *      Resize a virtual terminal. This is called by the tty layer as we
+ *      register our own handler for resizing. The mutual helper does all
+ *      the actual work.
+ *
+ *      Takes the console sem and the called methods then take the tty
+ *      termios_mutex and the tty ctrl_lock in that order.
+ */
+static int vt_resize(struct tty_struct *tty, struct winsize *ws)
+{
+        struct vc_data *vc = tty->driver_data;
+        int ret;
+
+        console_lock();
+        ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
+        console_unlock();
+        return ret;
+}
+
+void vc_deallocate(unsigned int currcons)
+{
+        WARN_CONSOLE_UNLOCKED();
+
+        if (vc_cons_allocated(currcons)) {
+                struct vc_data *vc = vc_cons[currcons].d;
+                struct vt_notifier_param param = { .vc = vc };
+
+                atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
+                vcs_remove_sysfs(currcons);
+                vc->vc_sw->con_deinit(vc);
+                put_pid(vc->vt_pid);
+                module_put(vc->vc_sw->owner);
+                kfree(vc->vc_screenbuf);
+                if (currcons >= MIN_NR_CONSOLES)
+                        kfree(vc);
+                vc_cons[currcons].d = NULL;
+        }
+}
+
+/*
+ *      VT102 emulator
+ */
+
+#define set_kbd(vc, x)  set_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
+#define clr_kbd(vc, x)  clr_vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
+#define is_kbd(vc, x)   vc_kbd_mode(kbd_table + (vc)->vc_num, (x))
+
+#define decarm          VC_REPEAT
+#define decckm          VC_CKMODE
+#define kbdapplic       VC_APPLIC
+#define lnm             VC_CRLF
+
+/*
+ * this is what the terminal answers to a ESC-Z or csi0c query.
+ */
+#define VT100ID "\033[?1;2c"
+#define VT102ID "\033[?6c"
+
+unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
+                                       8,12,10,14, 9,13,11,15 };
+
+/* the default colour table, for VGA+ colour systems */
+int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
+    0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
+int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
+    0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
+int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
+    0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
+
+module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
+module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
+module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
+
+/*
+ * gotoxy() must verify all boundaries, because the arguments
+ * might also be negative. If the given position is out of
+ * bounds, the cursor is placed at the nearest margin.
+ */
+static void gotoxy(struct vc_data *vc, int new_x, int new_y)
+{
+        int min_y, max_y;
+
+        if (new_x < 0)
+                vc->vc_x = 0;
+        else {
+                if (new_x >= vc->vc_cols)
+                        vc->vc_x = vc->vc_cols - 1;
+                else
+                        vc->vc_x = new_x;
+        }
+
+        if (vc->vc_decom) {
+                min_y = vc->vc_top;
+                max_y = vc->vc_bottom;
+        } else {
+                min_y = 0;
+                max_y = vc->vc_rows;
+        }
+        if (new_y < min_y)
+                vc->vc_y = min_y;
+        else if (new_y >= max_y)
+                vc->vc_y = max_y - 1;
+        else
+                vc->vc_y = new_y;
+        vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
+        vc->vc_need_wrap = 0;
+}
+
+/* for absolute user moves, when decom is set */
+static void gotoxay(struct vc_data *vc, int new_x, int new_y)
+{
+        gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
+}
+
+void scrollback(struct vc_data *vc, int lines)
+{
+        if (!lines)
+                lines = vc->vc_rows / 2;
+        scrolldelta(-lines);
+}
+
+void scrollfront(struct vc_data *vc, int lines)
+{
+        if (!lines)
+                lines = vc->vc_rows / 2;
+        scrolldelta(lines);
+}
+
+static void lf(struct vc_data *vc)
+{
+        /* don't scroll if above bottom of scrolling region, or
+         * if below scrolling region
+         */
+        if (vc->vc_y + 1 == vc->vc_bottom)
+                scrup(vc, vc->vc_top, vc->vc_bottom, 1);
+        else if (vc->vc_y < vc->vc_rows - 1) {
+                vc->vc_y++;
+                vc->vc_pos += vc->vc_size_row;
+        }
+        vc->vc_need_wrap = 0;
+        notify_write(vc, '\n');
+}
+
+static void ri(struct vc_data *vc)
+{
+        /* don't scroll if below top of scrolling region, or
+         * if above scrolling region
+         */
+        if (vc->vc_y == vc->vc_top)
+                scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
+        else if (vc->vc_y > 0) {
+                vc->vc_y--;
+                vc->vc_pos -= vc->vc_size_row;
+        }
+        vc->vc_need_wrap = 0;
+}
+
+static inline void cr(struct vc_data *vc)
+{
+        vc->vc_pos -= vc->vc_x << 1;
+        vc->vc_need_wrap = vc->vc_x = 0;
+        notify_write(vc, '\r');
+}
+
+static inline void bs(struct vc_data *vc)
+{
+        if (vc->vc_x) {
+                vc->vc_pos -= 2;
+                vc->vc_x--;
+                vc->vc_need_wrap = 0;
+                notify_write(vc, '\b');
+        }
+}
+
+static inline void del(struct vc_data *vc)
+{
+        /* ignored */
+}
+
+static void csi_J(struct vc_data *vc, int vpar)
+{
+        unsigned int count;
+        unsigned short * start;
+
+        switch (vpar) {
+                case 0: /* erase from cursor to end of display */
+                        count = (vc->vc_scr_end - vc->vc_pos) >> 1;
+                        start = (unsigned short *)vc->vc_pos;
+                        if (DO_UPDATE(vc)) {
+                                /* do in two stages */
+                                vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
+                                              vc->vc_cols - vc->vc_x);
+                                vc->vc_sw->con_clear(vc, vc->vc_y + 1, 0,
+                                              vc->vc_rows - vc->vc_y - 1,
+                                              vc->vc_cols);
+                        }
+                        break;
+                case 1: /* erase from start to cursor */
+                        count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
+                        start = (unsigned short *)vc->vc_origin;
+                        if (DO_UPDATE(vc)) {
+                                /* do in two stages */
+                                vc->vc_sw->con_clear(vc, 0, 0, vc->vc_y,
+                                              vc->vc_cols);
+                                vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
+                                              vc->vc_x + 1);
+                        }
+                        break;
+                case 3: /* erase scroll-back buffer (and whole display) */
+                        scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
+                                    vc->vc_screenbuf_size >> 1);
+                        set_origin(vc);
+                        if (CON_IS_VISIBLE(vc))
+                                update_screen(vc);
+                        /* fall through */
+                case 2: /* erase whole display */
+                        count = vc->vc_cols * vc->vc_rows;
+                        start = (unsigned short *)vc->vc_origin;
+                        if (DO_UPDATE(vc))
+                                vc->vc_sw->con_clear(vc, 0, 0,
+                                              vc->vc_rows,
+                                              vc->vc_cols);
+                        break;
+                default:
+                        return;
+        }
+        scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
+        vc->vc_need_wrap = 0;
+}
+
+static void csi_K(struct vc_data *vc, int vpar)
+{
+        unsigned int count;
+        unsigned short * start;
+
+        switch (vpar) {
+                case 0: /* erase from cursor to end of line */
+                        count = vc->vc_cols - vc->vc_x;
+                        start = (unsigned short *)vc->vc_pos;
+                        if (DO_UPDATE(vc))
+                                vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1,
+                                                     vc->vc_cols - vc->vc_x);
+                        break;
+                case 1: /* erase from start of line to cursor */
+                        start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
+                        count = vc->vc_x + 1;
+                        if (DO_UPDATE(vc))
+                                vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
+                                                     vc->vc_x + 1);
+                        break;
+                case 2: /* erase whole line */
+                        start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
+                        count = vc->vc_cols;
+                        if (DO_UPDATE(vc))
+                                vc->vc_sw->con_clear(vc, vc->vc_y, 0, 1,
+                                              vc->vc_cols);
+                        break;
+                default:
+                        return;
+        }
+        scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
+        vc->vc_need_wrap = 0;
+}
+
+static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
+{                                         /* not vt100? */
+        int count;
+
+        if (!vpar)
+                vpar++;
+        count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
+
+        scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
+        if (DO_UPDATE(vc))
+                vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
+        vc->vc_need_wrap = 0;
+}
+
+static void default_attr(struct vc_data *vc)
+{
+        vc->vc_intensity = 1;
+        vc->vc_italic = 0;
+        vc->vc_underline = 0;
+        vc->vc_reverse = 0;
+        vc->vc_blink = 0;
+        vc->vc_color = vc->vc_def_color;
+}
+
+/* console_lock is held */
+static void csi_m(struct vc_data *vc)
+{
+        int i;
+
+        for (i = 0; i <= vc->vc_npar; i++)
+                switch (vc->vc_par[i]) {
+                        case 0: /* all attributes off */
+                                default_attr(vc);
+                                break;
+                        case 1:
+                                vc->vc_intensity = 2;
+                                break;
+                        case 2:
+                                vc->vc_intensity = 0;
+                                break;
+                        case 3:
+                                vc->vc_italic = 1;
+                                break;
+                        case 4:
+                                vc->vc_underline = 1;
+                                break;
+                        case 5:
+                                vc->vc_blink = 1;
+                                break;
+                        case 7:
+                                vc->vc_reverse = 1;
+                                break;
+                        case 10: /* ANSI X3.64-1979 (SCO-ish?)
+                                  * Select primary font, don't display
+                                  * control chars if defined, don't set
+                                  * bit 8 on output.
+                                  */
+                                vc->vc_translate = set_translate(vc->vc_charset == 0
+                                                ? vc->vc_G0_charset
+                                                : vc->vc_G1_charset, vc);
+                                vc->vc_disp_ctrl = 0;
+                                vc->vc_toggle_meta = 0;
+                                break;
+                        case 11: /* ANSI X3.64-1979 (SCO-ish?)
+                                  * Select first alternate font, lets
+                                  * chars < 32 be displayed as ROM chars.
+                                  */
+                                vc->vc_translate = set_translate(IBMPC_MAP, vc);
+                                vc->vc_disp_ctrl = 1;
+                                vc->vc_toggle_meta = 0;
+                                break;
+                        case 12: /* ANSI X3.64-1979 (SCO-ish?)
+                                  * Select second alternate font, toggle
+                                  * high bit before displaying as ROM char.
+                                  */
+                                vc->vc_translate = set_translate(IBMPC_MAP, vc);
+                                vc->vc_disp_ctrl = 1;
+                                vc->vc_toggle_meta = 1;
+                                break;
+                        case 21:
+                        case 22:
+                                vc->vc_intensity = 1;
+                                break;
+                        case 23:
+                                vc->vc_italic = 0;
+                                break;
+                        case 24:
+                                vc->vc_underline = 0;
+                                break;
+                        case 25:
+                                vc->vc_blink = 0;
+                                break;
+                        case 27:
+                                vc->vc_reverse = 0;
+                                break;
+                        case 38: /* ANSI X3.64-1979 (SCO-ish?)
+                                  * Enables underscore, white foreground
+                                  * with white underscore (Linux - use
+                                  * default foreground).
+                                  */
+                                vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
+                                vc->vc_underline = 1;
+                                break;
+                        case 39: /* ANSI X3.64-1979 (SCO-ish?)
+                                  * Disable underline option.
+                                  * Reset colour to default? It did this
+                                  * before...
+                                  */
+                                vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
+                                vc->vc_underline = 0;
+                                break;
+                        case 49:
+                                vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
+                                break;
+                        default:
+                                if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
+                                        vc->vc_color = color_table[vc->vc_par[i] - 30]
+                                                | (vc->vc_color & 0xf0);
+                                else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
+                                        vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
+                                                | (vc->vc_color & 0x0f);
+                                break;
+                }
+        update_attr(vc);
+}
+
+static void respond_string(const char *p, struct tty_struct *tty)
+{
+        while (*p) {
+                tty_insert_flip_char(tty, *p, 0);
+                p++;
+        }
+        con_schedule_flip(tty);
+}
+
+static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
+{
+        char buf[40];
+
+        sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
+        respond_string(buf, tty);
+}
+
+static inline void status_report(struct tty_struct *tty)
+{
+        respond_string("\033[0n", tty); /* Terminal ok */
+}
+
+static inline void respond_ID(struct tty_struct * tty)
+{
+        respond_string(VT102ID, tty);
+}
+
+void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
+{
+        char buf[8];
+
+        sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
+                (char)('!' + mry));
+        respond_string(buf, tty);
+}
+
+/* invoked via ioctl(TIOCLINUX) and through set_selection */
+int mouse_reporting(void)
+{
+        return vc_cons[fg_console].d->vc_report_mouse;
+}
+
+/* console_lock is held */
+static void set_mode(struct vc_data *vc, int on_off)
+{
+        int i;
+
+        for (i = 0; i <= vc->vc_npar; i++)
+                if (vc->vc_ques) {
+                        switch(vc->vc_par[i]) { /* DEC private modes set/reset */
+                        case 1:                 /* Cursor keys send ^[Ox/^[[x */
+                                if (on_off)
+                                        set_kbd(vc, decckm);
+                                else
+                                        clr_kbd(vc, decckm);
+                                break;
+                        case 3: /* 80/132 mode switch unimplemented */
+                                vc->vc_deccolm = on_off;
+#if 0
+                                vc_resize(deccolm ? 132 : 80, vc->vc_rows);
+                                /* this alone does not suffice; some user mode
+                                   utility has to change the hardware regs */
+#endif
+                                break;
+                        case 5:                 /* Inverted screen on/off */
+                                if (vc->vc_decscnm != on_off) {
+                                        vc->vc_decscnm = on_off;
+                                        invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
+                                        update_attr(vc);
+                                }
+                                break;
+                        case 6:                 /* Origin relative/absolute */
+                                vc->vc_decom = on_off;
+                                gotoxay(vc, 0, 0);
+                                break;
+                        case 7:                 /* Autowrap on/off */
+                                vc->vc_decawm = on_off;
+                                break;
+                        case 8:                 /* Autorepeat on/off */
+                                if (on_off)
+                                        set_kbd(vc, decarm);
+                                else
+                                        clr_kbd(vc, decarm);
+                                break;
+                        case 9:
+                                vc->vc_report_mouse = on_off ? 1 : 0;
+                                break;
+                        case 25:                /* Cursor on/off */
+                                vc->vc_deccm = on_off;
+                                break;
+                        case 1000:
+                                vc->vc_report_mouse = on_off ? 2 : 0;
+                                break;
+                        }
+                } else {
+                        switch(vc->vc_par[i]) { /* ANSI modes set/reset */
+                        case 3:                 /* Monitor (display ctrls) */
+                                vc->vc_disp_ctrl = on_off;
+                                break;
+                        case 4:                 /* Insert Mode on/off */
+                                vc->vc_decim = on_off;
+                                break;
+                        case 20:                /* Lf, Enter == CrLf/Lf */
+                                if (on_off)
+                                        set_kbd(vc, lnm);
+                                else
+                                        clr_kbd(vc, lnm);
+                                break;
+                        }
+                }
+}
+
+/* console_lock is held */
+static void setterm_command(struct vc_data *vc)
+{
+        switch(vc->vc_par[0]) {
+                case 1: /* set color for underline mode */
+                        if (vc->vc_can_do_color &&
+                                        vc->vc_par[1] < 16) {
+                                vc->vc_ulcolor = color_table[vc->vc_par[1]];
+                                if (vc->vc_underline)
+                                        update_attr(vc);
+                        }
+                        break;
+                case 2: /* set color for half intensity mode */
+                        if (vc->vc_can_do_color &&
+                                        vc->vc_par[1] < 16) {
+                                vc->vc_halfcolor = color_table[vc->vc_par[1]];
+                                if (vc->vc_intensity == 0)
+                                        update_attr(vc);
+                        }
+                        break;
+                case 8: /* store colors as defaults */
+                        vc->vc_def_color = vc->vc_attr;
+                        if (vc->vc_hi_font_mask == 0x100)
+                                vc->vc_def_color >>= 1;
+                        default_attr(vc);
+                        update_attr(vc);
+                        break;
+                case 9: /* set blanking interval */
+                        blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
+                        poke_blanked_console();
+                        break;
+                case 10: /* set bell frequency in Hz */
+                        if (vc->vc_npar >= 1)
+                                vc->vc_bell_pitch = vc->vc_par[1];
+                        else
+                                vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
+                        break;
+                case 11: /* set bell duration in msec */
+                        if (vc->vc_npar >= 1)
+                                vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
+                                        vc->vc_par[1] * HZ / 1000 : 0;
+                        else
+                                vc->vc_bell_duration = DEFAULT_BELL_DURATION;
+                        break;
+                case 12: /* bring specified console to the front */
+                        if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
+                                set_console(vc->vc_par[1] - 1);
+                        break;
+                case 13: /* unblank the screen */
+                        poke_blanked_console();
+                        break;
+                case 14: /* set vesa powerdown interval */
+                        vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
+                        break;
+                case 15: /* activate the previous console */
+                        set_console(last_console);
+                        break;
+        }
+}
+
+/* console_lock is held */
+static void csi_at(struct vc_data *vc, unsigned int nr)
+{
+        if (nr > vc->vc_cols - vc->vc_x)
+                nr = vc->vc_cols - vc->vc_x;
+        else if (!nr)
+                nr = 1;
+        insert_char(vc, nr);
+}
+
+/* console_lock is held */
+static void csi_L(struct vc_data *vc, unsigned int nr)
+{
+        if (nr > vc->vc_rows - vc->vc_y)
+                nr = vc->vc_rows - vc->vc_y;
+        else if (!nr)
+                nr = 1;
+        scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
+        vc->vc_need_wrap = 0;
+}
+
+/* console_lock is held */
+static void csi_P(struct vc_data *vc, unsigned int nr)
+{
+        if (nr > vc->vc_cols - vc->vc_x)
+                nr = vc->vc_cols - vc->vc_x;
+        else if (!nr)
+                nr = 1;
+        delete_char(vc, nr);
+}
+
+/* console_lock is held */
+static void csi_M(struct vc_data *vc, unsigned int nr)
+{
+        if (nr > vc->vc_rows - vc->vc_y)
+                nr = vc->vc_rows - vc->vc_y;
+        else if (!nr)
+                nr=1;
+        scrup(vc, vc->vc_y, vc->vc_bottom, nr);
+        vc->vc_need_wrap = 0;
+}
+
+/* console_lock is held (except via vc_init->reset_terminal */
+static void save_cur(struct vc_data *vc)
+{
+        vc->vc_saved_x          = vc->vc_x;
+        vc->vc_saved_y          = vc->vc_y;
+        vc->vc_s_intensity      = vc->vc_intensity;
+        vc->vc_s_italic         = vc->vc_italic;
+        vc->vc_s_underline      = vc->vc_underline;
+        vc->vc_s_blink          = vc->vc_blink;
+        vc->vc_s_reverse        = vc->vc_reverse;
+        vc->vc_s_charset        = vc->vc_charset;
+        vc->vc_s_color          = vc->vc_color;
+        vc->vc_saved_G0         = vc->vc_G0_charset;
+        vc->vc_saved_G1         = vc->vc_G1_charset;
+}
+
+/* console_lock is held */
+static void restore_cur(struct vc_data *vc)
+{
+        gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
+        vc->vc_intensity        = vc->vc_s_intensity;
+        vc->vc_italic           = vc->vc_s_italic;
+        vc->vc_underline        = vc->vc_s_underline;
+        vc->vc_blink            = vc->vc_s_blink;
+        vc->vc_reverse          = vc->vc_s_reverse;
+        vc->vc_charset          = vc->vc_s_charset;
+        vc->vc_color            = vc->vc_s_color;
+        vc->vc_G0_charset       = vc->vc_saved_G0;
+        vc->vc_G1_charset       = vc->vc_saved_G1;
+        vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
+        update_attr(vc);
+        vc->vc_need_wrap = 0;
+}
+
+enum { ESnormal, ESesc, ESsquare, ESgetpars, ESgotpars, ESfunckey,
+        EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
+        ESpalette };
+
+/* console_lock is held (except via vc_init()) */
+static void reset_terminal(struct vc_data *vc, int do_clear)
+{
+        vc->vc_top              = 0;
+        vc->vc_bottom           = vc->vc_rows;
+        vc->vc_state            = ESnormal;
+        vc->vc_ques             = 0;
+        vc->vc_translate        = set_translate(LAT1_MAP, vc);
+        vc->vc_G0_charset       = LAT1_MAP;
+        vc->vc_G1_charset       = GRAF_MAP;
+        vc->vc_charset          = 0;
+        vc->vc_need_wrap        = 0;
+        vc->vc_report_mouse     = 0;
+        vc->vc_utf              = default_utf8;
+        vc->vc_utf_count        = 0;
+
+        vc->vc_disp_ctrl        = 0;
+        vc->vc_toggle_meta      = 0;
+
+        vc->vc_decscnm          = 0;
+        vc->vc_decom            = 0;
+        vc->vc_decawm           = 1;
+        vc->vc_deccm            = global_cursor_default;
+        vc->vc_decim            = 0;
+
+        set_kbd(vc, decarm);
+        clr_kbd(vc, decckm);
+        clr_kbd(vc, kbdapplic);
+        clr_kbd(vc, lnm);
+        kbd_table[vc->vc_num].lockstate = 0;
+        kbd_table[vc->vc_num].slockstate = 0;
+        kbd_table[vc->vc_num].ledmode = LED_SHOW_FLAGS;
+        kbd_table[vc->vc_num].ledflagstate = kbd_table[vc->vc_num].default_ledflagstate;
+        /* do not do set_leds here because this causes an endless tasklet loop
+           when the keyboard hasn't been initialized yet */
+
+        vc->vc_cursor_type = cur_default;
+        vc->vc_complement_mask = vc->vc_s_complement_mask;
+
+        default_attr(vc);
+        update_attr(vc);
+
+        vc->vc_tab_stop[0]      = 0x01010100;
+        vc->vc_tab_stop[1]      =
+        vc->vc_tab_stop[2]      =
+        vc->vc_tab_stop[3]      =
+        vc->vc_tab_stop[4]      =
+        vc->vc_tab_stop[5]      =
+        vc->vc_tab_stop[6]      =
+        vc->vc_tab_stop[7]      = 0x01010101;
+
+        vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
+        vc->vc_bell_duration = DEFAULT_BELL_DURATION;
+
+        gotoxy(vc, 0, 0);
+        save_cur(vc);
+        if (do_clear)
+            csi_J(vc, 2);
+}
+
+/* console_lock is held */
+static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
+{
+        /*
+         *  Control characters can be used in the _middle_
+         *  of an escape sequence.
+         */
+        switch (c) {
+        case 0:
+                return;
+        case 7:
+                if (vc->vc_bell_duration)
+                        kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
+                return;
+        case 8:
+                bs(vc);
+                return;
+        case 9:
+                vc->vc_pos -= (vc->vc_x << 1);
+                while (vc->vc_x < vc->vc_cols - 1) {
+                        vc->vc_x++;
+                        if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
+                                break;
+                }
+                vc->vc_pos += (vc->vc_x << 1);
+                notify_write(vc, '\t');
+                return;
+        case 10: case 11: case 12:
+                lf(vc);
+                if (!is_kbd(vc, lnm))
+                        return;
+        case 13:
+                cr(vc);
+                return;
+        case 14:
+                vc->vc_charset = 1;
+                vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
+                vc->vc_disp_ctrl = 1;
+                return;
+        case 15:
+                vc->vc_charset = 0;
+                vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
+                vc->vc_disp_ctrl = 0;
+                return;
+        case 24: case 26:
+                vc->vc_state = ESnormal;
+                return;
+        case 27:
+                vc->vc_state = ESesc;
+                return;
+        case 127:
+                del(vc);
+                return;
+        case 128+27:
+                vc->vc_state = ESsquare;
+                return;
+        }
+        switch(vc->vc_state) {
+        case ESesc:
+                vc->vc_state = ESnormal;
+                switch (c) {
+                case '[':
+                        vc->vc_state = ESsquare;
+                        return;
+                case ']':
+                        vc->vc_state = ESnonstd;
+                        return;
+                case '%':
+                        vc->vc_state = ESpercent;
+                        return;
+                case 'E':
+                        cr(vc);
+                        lf(vc);
+                        return;
+                case 'M':
+                        ri(vc);
+                        return;
+                case 'D':
+                        lf(vc);
+                        return;
+                case 'H':
+                        vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
+                        return;
+                case 'Z':
+                        respond_ID(tty);
+                        return;
+                case '7':
+                        save_cur(vc);
+                        return;
+                case '8':
+                        restore_cur(vc);
+                        return;
+                case '(':
+                        vc->vc_state = ESsetG0;
+                        return;
+                case ')':
+                        vc->vc_state = ESsetG1;
+                        return;
+                case '#':
+                        vc->vc_state = EShash;
+                        return;
+                case 'c':
+                        reset_terminal(vc, 1);
+                        return;
+                case '>':  /* Numeric keypad */
+                        clr_kbd(vc, kbdapplic);
+                        return;
+                case '=':  /* Appl. keypad */
+                        set_kbd(vc, kbdapplic);
+                        return;
+                }
+                return;
+        case ESnonstd:
+                if (c=='P') {   /* palette escape sequence */
+                        for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
+                                vc->vc_par[vc->vc_npar] = 0;
+                        vc->vc_npar = 0;
+                        vc->vc_state = ESpalette;
+                        return;
+                } else if (c=='R') {   /* reset palette */
+                        reset_palette(vc);
+                        vc->vc_state = ESnormal;
+                } else
+                        vc->vc_state = ESnormal;
+                return;
+        case ESpalette:
+                if (isxdigit(c)) {
+                        vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
+                        if (vc->vc_npar == 7) {
+                                int i = vc->vc_par[0] * 3, j = 1;
+                                vc->vc_palette[i] = 16 * vc->vc_par[j++];
+                                vc->vc_palette[i++] += vc->vc_par[j++];
+                                vc->vc_palette[i] = 16 * vc->vc_par[j++];
+                                vc->vc_palette[i++] += vc->vc_par[j++];
+                                vc->vc_palette[i] = 16 * vc->vc_par[j++];
+                                vc->vc_palette[i] += vc->vc_par[j];
+                                set_palette(vc);
+                                vc->vc_state = ESnormal;
+                        }
+                } else
+                        vc->vc_state = ESnormal;
+                return;
+        case ESsquare:
+                for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
+                        vc->vc_par[vc->vc_npar] = 0;
+                vc->vc_npar = 0;
+                vc->vc_state = ESgetpars;
+                if (c == '[') { /* Function key */
+                        vc->vc_state=ESfunckey;
+                        return;
+                }
+                vc->vc_ques = (c == '?');
+                if (vc->vc_ques)
+                        return;
+        case ESgetpars:
+                if (c == ';' && vc->vc_npar < NPAR - 1) {
+                        vc->vc_npar++;
+                        return;
+                } else if (c>='0' && c<='9') {
+                        vc->vc_par[vc->vc_npar] *= 10;
+                        vc->vc_par[vc->vc_npar] += c - '0';
+                        return;
+                } else
+                        vc->vc_state = ESgotpars;
+        case ESgotpars:
+                vc->vc_state = ESnormal;
+                switch(c) {
+                case 'h':
+                        set_mode(vc, 1);
+                        return;
+                case 'l':
+                        set_mode(vc, 0);
+                        return;
+                case 'c':
+                        if (vc->vc_ques) {
+                                if (vc->vc_par[0])
+                                        vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
+                                else
+                                        vc->vc_cursor_type = cur_default;
+                                return;
+                        }
+                        break;
+                case 'm':
+                        if (vc->vc_ques) {
+                                clear_selection();
+                                if (vc->vc_par[0])
+                                        vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
+                                else
+                                        vc->vc_complement_mask = vc->vc_s_complement_mask;
+                                return;
+                        }
+                        break;
+                case 'n':
+                        if (!vc->vc_ques) {
+                                if (vc->vc_par[0] == 5)
+                                        status_report(tty);
+                                else if (vc->vc_par[0] == 6)
+                                        cursor_report(vc, tty);
+                        }
+                        return;
+                }
+                if (vc->vc_ques) {
+                        vc->vc_ques = 0;
+                        return;
+                }
+                switch(c) {
+                case 'G': case '`':
+                        if (vc->vc_par[0])
+                                vc->vc_par[0]--;
+                        gotoxy(vc, vc->vc_par[0], vc->vc_y);
+                        return;
+                case 'A':
+                        if (!vc->vc_par[0])
+                                vc->vc_par[0]++;
+                        gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
+                        return;
+                case 'B': case 'e':
+                        if (!vc->vc_par[0])
+                                vc->vc_par[0]++;
+                        gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
+                        return;
+                case 'C': case 'a':
+                        if (!vc->vc_par[0])
+                                vc->vc_par[0]++;
+                        gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
+                        return;
+                case 'D':
+                        if (!vc->vc_par[0])
+                                vc->vc_par[0]++;
+                        gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
+                        return;
+                case 'E':
+                        if (!vc->vc_par[0])
+                                vc->vc_par[0]++;
+                        gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
+                        return;
+                case 'F':
+                        if (!vc->vc_par[0])
+                                vc->vc_par[0]++;
+                        gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
+                        return;
+                case 'd':
+                        if (vc->vc_par[0])
+                                vc->vc_par[0]--;
+                        gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
+                        return;
+                case 'H': case 'f':
+                        if (vc->vc_par[0])
+                                vc->vc_par[0]--;
+                        if (vc->vc_par[1])
+                                vc->vc_par[1]--;
+                        gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
+                        return;
+                case 'J':
+                        csi_J(vc, vc->vc_par[0]);
+                        return;
+                case 'K':
+                        csi_K(vc, vc->vc_par[0]);
+                        return;
+                case 'L':
+                        csi_L(vc, vc->vc_par[0]);
+                        return;
+                case 'M':
+                        csi_M(vc, vc->vc_par[0]);
+                        return;
+                case 'P':
+                        csi_P(vc, vc->vc_par[0]);
+                        return;
+                case 'c':
+                        if (!vc->vc_par[0])
+                                respond_ID(tty);
+                        return;
+                case 'g':
+                        if (!vc->vc_par[0])
+                                vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
+                        else if (vc->vc_par[0] == 3) {
+                                vc->vc_tab_stop[0] =
+                                        vc->vc_tab_stop[1] =
+                                        vc->vc_tab_stop[2] =
+                                        vc->vc_tab_stop[3] =
+                                        vc->vc_tab_stop[4] =
+                                        vc->vc_tab_stop[5] =
+                                        vc->vc_tab_stop[6] =
+                                        vc->vc_tab_stop[7] = 0;
+                        }
+                        return;
+                case 'm':
+                        csi_m(vc);
+                        return;
+                case 'q': /* DECLL - but only 3 leds */
+                        /* map 0,1,2,3 to 0,1,2,4 */
+                        if (vc->vc_par[0] < 4)
+                                setledstate(kbd_table + vc->vc_num,
+                                            (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
+                        return;
+                case 'r':
+                        if (!vc->vc_par[0])
+                                vc->vc_par[0]++;
+                        if (!vc->vc_par[1])
+                                vc->vc_par[1] = vc->vc_rows;
+                        /* Minimum allowed region is 2 lines */
+                        if (vc->vc_par[0] < vc->vc_par[1] &&
+                            vc->vc_par[1] <= vc->vc_rows) {
+                                vc->vc_top = vc->vc_par[0] - 1;
+                                vc->vc_bottom = vc->vc_par[1];
+                                gotoxay(vc, 0, 0);
+                        }
+                        return;
+                case 's':
+                        save_cur(vc);
+                        return;
+                case 'u':
+                        restore_cur(vc);
+                        return;
+                case 'X':
+                        csi_X(vc, vc->vc_par[0]);
+                        return;
+                case '@':
+                        csi_at(vc, vc->vc_par[0]);
+                        return;
+                case ']': /* setterm functions */
+                        setterm_command(vc);
+                        return;
+                }
+                return;
+        case ESpercent:
+                vc->vc_state = ESnormal;
+                switch (c) {
+                case '@':  /* defined in ISO 2022 */
+                        vc->vc_utf = 0;
+                        return;
+                case 'G':  /* prelim official escape code */
+                case '8':  /* retained for compatibility */
+                        vc->vc_utf = 1;
+                        return;
+                }
+                return;
+        case ESfunckey:
+                vc->vc_state = ESnormal;
+                return;
+        case EShash:
+                vc->vc_state = ESnormal;
+                if (c == '8') {
+                        /* DEC screen alignment test. kludge :-) */
+                        vc->vc_video_erase_char =
+                                (vc->vc_video_erase_char & 0xff00) | 'E';
+                        csi_J(vc, 2);
+                        vc->vc_video_erase_char =
+                                (vc->vc_video_erase_char & 0xff00) | ' ';
+                        do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
+                }
+                return;
+        case ESsetG0:
+                if (c == '0')
+                        vc->vc_G0_charset = GRAF_MAP;
+                else if (c == 'B')
+                        vc->vc_G0_charset = LAT1_MAP;
+                else if (c == 'U')
+                        vc->vc_G0_charset = IBMPC_MAP;
+                else if (c == 'K')
+                        vc->vc_G0_charset = USER_MAP;
+                if (vc->vc_charset == 0)
+                        vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
+                vc->vc_state = ESnormal;
+                return;
+        case ESsetG1:
+                if (c == '0')
+                        vc->vc_G1_charset = GRAF_MAP;
+                else if (c == 'B')
+                        vc->vc_G1_charset = LAT1_MAP;
+                else if (c == 'U')
+                        vc->vc_G1_charset = IBMPC_MAP;
+                else if (c == 'K')
+                        vc->vc_G1_charset = USER_MAP;
+                if (vc->vc_charset == 1)
+                        vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
+                vc->vc_state = ESnormal;
+                return;
+        default:
+                vc->vc_state = ESnormal;
+        }
+}
+
+/* is_double_width() is based on the wcwidth() implementation by
+ * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
+ * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+ */
+struct interval {
+        uint32_t first;
+        uint32_t last;
+};
+
+static int bisearch(uint32_t ucs, const struct interval *table, int max)
+{
+        int min = 0;
+        int mid;
+
+        if (ucs < table[0].first || ucs > table[max].last)
+                return 0;
+        while (max >= min) {
+                mid = (min + max) / 2;
+                if (ucs > table[mid].last)
+                        min = mid + 1;
+                else if (ucs < table[mid].first)
+                        max = mid - 1;
+                else
+                        return 1;
+        }
+        return 0;
+}
+
+static int is_double_width(uint32_t ucs)
+{
+        static const struct interval double_width[] = {
+                { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
+                { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
+                { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
+                { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
+        };
+        return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
+}
+
+/* acquires console_lock */
+static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+#ifdef VT_BUF_VRAM_ONLY
+#define FLUSH do { } while(0);
+#else
+#define FLUSH if (draw_x >= 0) { \
+        vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
+        draw_x = -1; \
+        }
+#endif
+
+        int c, tc, ok, n = 0, draw_x = -1;
+        unsigned int currcons;
+        unsigned long draw_from = 0, draw_to = 0;
+        struct vc_data *vc;
+        unsigned char vc_attr;
+        struct vt_notifier_param param;
+        uint8_t rescan;
+        uint8_t inverse;
+        uint8_t width;
+        u16 himask, charmask;
+
+        if (in_interrupt())
+                return count;
+
+        might_sleep();
+
+        console_lock();
+        vc = tty->driver_data;
+        if (vc == NULL) {
+                printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
+                console_unlock();
+                return 0;
+        }
+
+        currcons = vc->vc_num;
+        if (!vc_cons_allocated(currcons)) {
+                /* could this happen? */
+                pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
+                console_unlock();
+                return 0;
+        }
+
+        himask = vc->vc_hi_font_mask;
+        charmask = himask ? 0x1ff : 0xff;
+
+        /* undraw cursor first */
+        if (IS_FG(vc))
+                hide_cursor(vc);
+
+        param.vc = vc;
+
+        while (!tty->stopped && count) {
+                int orig = *buf;
+                c = orig;
+                buf++;
+                n++;
+                count--;
+                rescan = 0;
+                inverse = 0;
+                width = 1;
+
+                /* Do no translation at all in control states */
+                if (vc->vc_state != ESnormal) {
+                        tc = c;
+                } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
+                    /* Combine UTF-8 into Unicode in vc_utf_char.
+                     * vc_utf_count is the number of continuation bytes still
+                     * expected to arrive.
+                     * vc_npar is the number of continuation bytes arrived so
+                     * far
+                     */
+rescan_last_byte:
+                    if ((c & 0xc0) == 0x80) {
+                        /* Continuation byte received */
+                        static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
+                        if (vc->vc_utf_count) {
+                            vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
+                            vc->vc_npar++;
+                            if (--vc->vc_utf_count) {
+                                /* Still need some bytes */
+                                continue;
+                            }
+                            /* Got a whole character */
+                            c = vc->vc_utf_char;
+                            /* Reject overlong sequences */
+                            if (c <= utf8_length_changes[vc->vc_npar - 1] ||
+                                        c > utf8_length_changes[vc->vc_npar])
+                                c = 0xfffd;
+                        } else {
+                            /* Unexpected continuation byte */
+                            vc->vc_utf_count = 0;
+                            c = 0xfffd;
+                        }
+                    } else {
+                        /* Single ASCII byte or first byte of a sequence received */
+                        if (vc->vc_utf_count) {
+                            /* Continuation byte expected */
+                            rescan = 1;
+                            vc->vc_utf_count = 0;
+                            c = 0xfffd;
+                        } else if (c > 0x7f) {
+                            /* First byte of a multibyte sequence received */
+                            vc->vc_npar = 0;
+                            if ((c & 0xe0) == 0xc0) {
+                                vc->vc_utf_count = 1;
+                                vc->vc_utf_char = (c & 0x1f);
+                            } else if ((c & 0xf0) == 0xe0) {
+                                vc->vc_utf_count = 2;
+                                vc->vc_utf_char = (c & 0x0f);
+                            } else if ((c & 0xf8) == 0xf0) {
+                                vc->vc_utf_count = 3;
+                                vc->vc_utf_char = (c & 0x07);
+                            } else if ((c & 0xfc) == 0xf8) {
+                                vc->vc_utf_count = 4;
+                                vc->vc_utf_char = (c & 0x03);
+                            } else if ((c & 0xfe) == 0xfc) {
+                                vc->vc_utf_count = 5;
+                                vc->vc_utf_char = (c & 0x01);
+                            } else {
+                                /* 254 and 255 are invalid */
+                                c = 0xfffd;
+                            }
+                            if (vc->vc_utf_count) {
+                                /* Still need some bytes */
+                                continue;
+                            }
+                        }
+                        /* Nothing to do if an ASCII byte was received */
+                    }
+                    /* End of UTF-8 decoding. */
+                    /* c is the received character, or U+FFFD for invalid sequences. */
+                    /* Replace invalid Unicode code points with U+FFFD too */
+                    if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
+                        c = 0xfffd;
+                    tc = c;
+                } else {        /* no utf or alternate charset mode */
+                    tc = vc_translate(vc, c);
+                }
+
+                param.c = tc;
+                if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
+                                        &param) == NOTIFY_STOP)
+                        continue;
+
+                /* If the original code was a control character we
+                 * only allow a glyph to be displayed if the code is
+                 * not normally used (such as for cursor movement) or
+                 * if the disp_ctrl mode has been explicitly enabled.
+                 * Certain characters (as given by the CTRL_ALWAYS
+                 * bitmap) are always displayed as control characters,
+                 * as the console would be pretty useless without
+                 * them; to display an arbitrary font position use the
+                 * direct-to-font zone in UTF-8 mode.
+                 */
+                ok = tc && (c >= 32 ||
+                            !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
+                                  vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
+                        && (c != 127 || vc->vc_disp_ctrl)
+                        && (c != 128+27);
+
+                if (vc->vc_state == ESnormal && ok) {
+                        if (vc->vc_utf && !vc->vc_disp_ctrl) {
+                                if (is_double_width(c))
+                                        width = 2;
+                        }
+                        /* Now try to find out how to display it */
+                        tc = conv_uni_to_pc(vc, tc);
+                        if (tc & ~charmask) {
+                                if (tc == -1 || tc == -2) {
+                                    continue; /* nothing to display */
+                                }
+                                /* Glyph not found */
+                                if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
+                                    /* In legacy mode use the glyph we get by a 1:1 mapping.
+                                       This would make absolutely no sense with Unicode in mind,
+                                       but do this for ASCII characters since a font may lack
+                                       Unicode mapping info and we don't want to end up with
+                                       having question marks only. */
+                                    tc = c;
+                                } else {
+                                    /* Display U+FFFD. If it's not found, display an inverse question mark. */
+                                    tc = conv_uni_to_pc(vc, 0xfffd);
+                                    if (tc < 0) {
+                                        inverse = 1;
+                                        tc = conv_uni_to_pc(vc, '?');
+                                        if (tc < 0) tc = '?';
+                                    }
+                                }
+                        }
+
+                        if (!inverse) {
+                                vc_attr = vc->vc_attr;
+                        } else {
+                                /* invert vc_attr */
+                                if (!vc->vc_can_do_color) {
+                                        vc_attr = (vc->vc_attr) ^ 0x08;
+                                } else if (vc->vc_hi_font_mask == 0x100) {
+                                        vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
+                                } else {
+                                        vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
+                                }
+                                FLUSH
+                        }
+
+                        while (1) {
+                                if (vc->vc_need_wrap || vc->vc_decim)
+                                        FLUSH
+                                if (vc->vc_need_wrap) {
+                                        cr(vc);
+                                        lf(vc);
+                                }
+                                if (vc->vc_decim)
+                                        insert_char(vc, 1);
+                                scr_writew(himask ?
+                                             ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
+                                             (vc_attr << 8) + tc,
+                                           (u16 *) vc->vc_pos);
+                                if (DO_UPDATE(vc) && draw_x < 0) {
+                                        draw_x = vc->vc_x;
+                                        draw_from = vc->vc_pos;
+                                }
+                                if (vc->vc_x == vc->vc_cols - 1) {
+                                        vc->vc_need_wrap = vc->vc_decawm;
+                                        draw_to = vc->vc_pos + 2;
+                                } else {
+                                        vc->vc_x++;
+                                        draw_to = (vc->vc_pos += 2);
+                                }
+
+                                if (!--width) break;
+
+                                tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
+                                if (tc < 0) tc = ' ';
+                        }
+                        notify_write(vc, c);
+
+                        if (inverse) {
+                                FLUSH
+                        }
+
+                        if (rescan) {
+                                rescan = 0;
+                                inverse = 0;
+                                width = 1;
+                                c = orig;
+                                goto rescan_last_byte;
+                        }
+                        continue;
+                }
+                FLUSH
+                do_con_trol(tty, vc, orig);
+        }
+        FLUSH
+        console_conditional_schedule();
+        console_unlock();
+        notify_update(vc);
+        return n;
+#undef FLUSH
+}
+
+/*
+ * This is the console switching callback.
+ *
+ * Doing console switching in a process context allows
+ * us to do the switches asynchronously (needed when we want
+ * to switch due to a keyboard interrupt).  Synchronization
+ * with other console code and prevention of re-entrancy is
+ * ensured with console_lock.
+ */
+static void console_callback(struct work_struct *ignored)
+{
+        console_lock();
+
+        if (want_console >= 0) {
+                if (want_console != fg_console &&
+                    vc_cons_allocated(want_console)) {
+                        hide_cursor(vc_cons[fg_console].d);
+                        change_console(vc_cons[want_console].d);
+                        /* we only changed when the console had already
+                           been allocated - a new console is not created
+                           in an interrupt routine */
+                }
+                want_console = -1;
+        }
+        if (do_poke_blanked_console) { /* do not unblank for a LED change */
+                do_poke_blanked_console = 0;
+                poke_blanked_console();
+        }
+        if (scrollback_delta) {
+                struct vc_data *vc = vc_cons[fg_console].d;
+                clear_selection();
+                if (vc->vc_mode == KD_TEXT)
+                        vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
+                scrollback_delta = 0;
+        }
+        if (blank_timer_expired) {
+                do_blank_screen(0);
+                blank_timer_expired = 0;
+        }
+        notify_update(vc_cons[fg_console].d);
+
+        console_unlock();
+}
+
+int set_console(int nr)
+{
+        struct vc_data *vc = vc_cons[fg_console].d;
+
+        if (!vc_cons_allocated(nr) || vt_dont_switch ||
+                (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
+
+                /*
+                 * Console switch will fail in console_callback() or
+                 * change_console() so there is no point scheduling
+                 * the callback
+                 *
+                 * Existing set_console() users don't check the return
+                 * value so this shouldn't break anything
+                 */
+                return -EINVAL;
+        }
+
+        want_console = nr;
+        schedule_console_callback();
+
+        return 0;
+}
+
+struct tty_driver *console_driver;
+
+#ifdef CONFIG_VT_CONSOLE
+
+/**
+ * vt_kmsg_redirect() - Sets/gets the kernel message console
+ * @new:        The new virtual terminal number or -1 if the console should stay
+ *              unchanged
+ *
+ * By default, the kernel messages are always printed on the current virtual
+ * console. However, the user may modify that default with the
+ * TIOCL_SETKMSGREDIRECT ioctl call.
+ *
+ * This function sets the kernel message console to be @new. It returns the old
+ * virtual console number. The virtual terminal number 0 (both as parameter and
+ * return value) means no redirection (i.e. always printed on the currently
+ * active console).
+ *
+ * The parameter -1 means that only the current console is returned, but the
+ * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
+ * case to make the code more understandable.
+ *
+ * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
+ * the parameter and always returns 0.
+ */
+int vt_kmsg_redirect(int new)
+{
+        static int kmsg_con;
+
+        if (new != -1)
+                return xchg(&kmsg_con, new);
+        else
+                return kmsg_con;
+}
+
+/*
+ *      Console on virtual terminal
+ *
+ * The console must be locked when we get here.
+ */
+
+static void vt_console_print(struct console *co, const char *b, unsigned count)
+{
+        struct vc_data *vc = vc_cons[fg_console].d;
+        unsigned char c;
+        static DEFINE_SPINLOCK(printing_lock);
+        const ushort *start;
+        ushort cnt = 0;
+        ushort myx;
+        int kmsg_console;
+
+        /* console busy or not yet initialized */
+        if (!printable)
+                return;
+        if (!spin_trylock(&printing_lock))
+                return;
+
+        kmsg_console = vt_get_kmsg_redirect();
+        if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
+                vc = vc_cons[kmsg_console - 1].d;
+
+        /* read `x' only after setting currcons properly (otherwise
+           the `x' macro will read the x of the foreground console). */
+        myx = vc->vc_x;
+
+        if (!vc_cons_allocated(fg_console)) {
+                /* impossible */
+                /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
+                goto quit;
+        }
+
+        if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
+                goto quit;
+
+        /* undraw cursor first */
+        if (IS_FG(vc))
+                hide_cursor(vc);
+
+        start = (ushort *)vc->vc_pos;
+
+        /* Contrived structure to try to emulate original need_wrap behaviour
+         * Problems caused when we have need_wrap set on '\n' character */
+        while (count--) {
+                c = *b++;
+                if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
+                        if (cnt > 0) {
+                                if (CON_IS_VISIBLE(vc))
+                                        vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
+                                vc->vc_x += cnt;
+                                if (vc->vc_need_wrap)
+                                        vc->vc_x--;
+                                cnt = 0;
+                        }
+                        if (c == 8) {           /* backspace */
+                                bs(vc);
+                                start = (ushort *)vc->vc_pos;
+                                myx = vc->vc_x;
+                                continue;
+                        }
+                        if (c != 13)
+                                lf(vc);
+                        cr(vc);
+                        start = (ushort *)vc->vc_pos;
+                        myx = vc->vc_x;
+                        if (c == 10 || c == 13)
+                                continue;
+                }
+                scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
+                notify_write(vc, c);
+                cnt++;
+                if (myx == vc->vc_cols - 1) {
+                        vc->vc_need_wrap = 1;
+                        continue;
+                }
+                vc->vc_pos += 2;
+                myx++;
+        }
+        if (cnt > 0) {
+                if (CON_IS_VISIBLE(vc))
+                        vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
+                vc->vc_x += cnt;
+                if (vc->vc_x == vc->vc_cols) {
+                        vc->vc_x--;
+                        vc->vc_need_wrap = 1;
+                }
+        }
+        set_cursor(vc);
+        notify_update(vc);
+
+quit:
+        spin_unlock(&printing_lock);
+}
+
+static struct tty_driver *vt_console_device(struct console *c, int *index)
+{
+        *index = c->index ? c->index-1 : fg_console;
+        return console_driver;
+}
+
+static struct console vt_console_driver = {
+        .name           = "tty",
+        .write          = vt_console_print,
+        .device         = vt_console_device,
+        .unblank        = unblank_screen,
+        .flags          = CON_PRINTBUFFER,
+        .index          = -1,
+};
+#endif
+
+/*
+ *      Handling of Linux-specific VC ioctls
+ */
+
+/*
+ * Generally a bit racy with respect to console_lock();.
+ *
+ * There are some functions which don't need it.
+ *
+ * There are some functions which can sleep for arbitrary periods
+ * (paste_selection) but we don't need the lock there anyway.
+ *
+ * set_selection has locking, and definitely needs it
+ */
+
+int tioclinux(struct tty_struct *tty, unsigned long arg)
+{
+        char type, data;
+        char __user *p = (char __user *)arg;
+        int lines;
+        int ret;
+
+        if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        if (get_user(type, p))
+                return -EFAULT;
+        ret = 0;
+
+        switch (type)
+        {
+                case TIOCL_SETSEL:
+                        console_lock();
+                        ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
+                        console_unlock();
+                        break;
+                case TIOCL_PASTESEL:
+                        ret = paste_selection(tty);
+                        break;
+                case TIOCL_UNBLANKSCREEN:
+                        console_lock();
+                        unblank_screen();
+                        console_unlock();
+                        break;
+                case TIOCL_SELLOADLUT:
+                        ret = sel_loadlut(p);
+                        break;
+                case TIOCL_GETSHIFTSTATE:
+
+        /*
+         * Make it possible to react to Shift+Mousebutton.
+         * Note that 'shift_state' is an undocumented
+         * kernel-internal variable; programs not closely
+         * related to the kernel should not use this.
+         */
+                        data = shift_state;
+                        ret = __put_user(data, p);
+                        break;
+                case TIOCL_GETMOUSEREPORTING:
+                        data = mouse_reporting();
+                        ret = __put_user(data, p);
+                        break;
+                case TIOCL_SETVESABLANK:
+                        ret = set_vesa_blanking(p);
+                        break;
+                case TIOCL_GETKMSGREDIRECT:
+                        data = vt_get_kmsg_redirect();
+                        ret = __put_user(data, p);
+                        break;
+                case TIOCL_SETKMSGREDIRECT:
+                        if (!capable(CAP_SYS_ADMIN)) {
+                                ret = -EPERM;
+                        } else {
+                                if (get_user(data, p+1))
+                                        ret = -EFAULT;
+                                else
+                                        vt_kmsg_redirect(data);
+                        }
+                        break;
+                case TIOCL_GETFGCONSOLE:
+                        ret = fg_console;
+                        break;
+                case TIOCL_SCROLLCONSOLE:
+                        if (get_user(lines, (s32 __user *)(p+4))) {
+                                ret = -EFAULT;
+                        } else {
+                                scrollfront(vc_cons[fg_console].d, lines);
+                                ret = 0;
+                        }
+                        break;
+                case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
+                        console_lock();
+                        ignore_poke = 1;
+                        do_blank_screen(0);
+                        console_unlock();
+                        break;
+                case TIOCL_BLANKEDSCREEN:
+                        ret = console_blanked;
+                        break;
+                default:
+                        ret = -EINVAL;
+                        break;
+        }
+        return ret;
+}
+
+/*
+ * /dev/ttyN handling
+ */
+
+static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+        int     retval;
+
+        retval = do_con_write(tty, buf, count);
+        con_flush_chars(tty);
+
+        return retval;
+}
+
+static int con_put_char(struct tty_struct *tty, unsigned char ch)
+{
+        if (in_interrupt())
+                return 0;       /* n_r3964 calls put_char() from interrupt context */
+        return do_con_write(tty, &ch, 1);
+}
+
+static int con_write_room(struct tty_struct *tty)
+{
+        if (tty->stopped)
+                return 0;
+        return 32768;           /* No limit, really; we're not buffering */
+}
+
+static int con_chars_in_buffer(struct tty_struct *tty)
+{
+        return 0;               /* we're not buffering */
+}
+
+/*
+ * con_throttle and con_unthrottle are only used for
+ * paste_selection(), which has to stuff in a large number of
+ * characters...
+ */
+static void con_throttle(struct tty_struct *tty)
+{
+}
+
+static void con_unthrottle(struct tty_struct *tty)
+{
+        struct vc_data *vc = tty->driver_data;
+
+        wake_up_interruptible(&vc->paste_wait);
+}
+
+/*
+ * Turn the Scroll-Lock LED on when the tty is stopped
+ */
+static void con_stop(struct tty_struct *tty)
+{
+        int console_num;
+        if (!tty)
+                return;
+        console_num = tty->index;
+        if (!vc_cons_allocated(console_num))
+                return;
+        set_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
+        set_leds();
+}
+
+/*
+ * Turn the Scroll-Lock LED off when the console is started
+ */
+static void con_start(struct tty_struct *tty)
+{
+        int console_num;
+        if (!tty)
+                return;
+        console_num = tty->index;
+        if (!vc_cons_allocated(console_num))
+                return;
+        clr_vc_kbd_led(kbd_table + console_num, VC_SCROLLOCK);
+        set_leds();
+}
+
+static void con_flush_chars(struct tty_struct *tty)
+{
+        struct vc_data *vc;
+
+        if (in_interrupt())     /* from flush_to_ldisc */
+                return;
+
+        /* if we race with con_close(), vt may be null */
+        console_lock();
+        vc = tty->driver_data;
+        if (vc)
+                set_cursor(vc);
+        console_unlock();
+}
+
+/*
+ * Allocate the console screen memory.
+ */
+static int con_open(struct tty_struct *tty, struct file *filp)
+{
+        unsigned int currcons = tty->index;
+        int ret = 0;
+
+        console_lock();
+        if (tty->driver_data == NULL) {
+                ret = vc_allocate(currcons);
+                if (ret == 0) {
+                        struct vc_data *vc = vc_cons[currcons].d;
+
+                        /* Still being freed */
+                        if (vc->port.tty) {
+                                console_unlock();
+                                return -ERESTARTSYS;
+                        }
+                        tty->driver_data = vc;
+                        vc->port.tty = tty;
+
+                        if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
+                                tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
+                                tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
+                        }
+                        if (vc->vc_utf)
+                                tty->termios->c_iflag |= IUTF8;
+                        else
+                                tty->termios->c_iflag &= ~IUTF8;
+                        console_unlock();
+                        return ret;
+                }
+        }
+        console_unlock();
+        return ret;
+}
+
+static void con_close(struct tty_struct *tty, struct file *filp)
+{
+        /* Nothing to do - we defer to shutdown */
+}
+
+static void con_shutdown(struct tty_struct *tty)
+{
+        struct vc_data *vc = tty->driver_data;
+        BUG_ON(vc == NULL);
+        console_lock();
+        vc->port.tty = NULL;
+        console_unlock();
+        tty_shutdown(tty);
+}
+
+static int default_italic_color    = 2; // green (ASCII)
+static int default_underline_color = 3; // cyan (ASCII)
+module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
+module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
+
+static void vc_init(struct vc_data *vc, unsigned int rows,
+                    unsigned int cols, int do_clear)
+{
+        int j, k ;
+
+        vc->vc_cols = cols;
+        vc->vc_rows = rows;
+        vc->vc_size_row = cols << 1;
+        vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
+
+        set_origin(vc);
+        vc->vc_pos = vc->vc_origin;
+        reset_vc(vc);
+        for (j=k=0; j<16; j++) {
+                vc->vc_palette[k++] = default_red[j] ;
+                vc->vc_palette[k++] = default_grn[j] ;
+                vc->vc_palette[k++] = default_blu[j] ;
+        }
+        vc->vc_def_color       = 0x07;   /* white */
+        vc->vc_ulcolor         = default_underline_color;
+        vc->vc_itcolor         = default_italic_color;
+        vc->vc_halfcolor       = 0x08;   /* grey */
+        init_waitqueue_head(&vc->paste_wait);
+        reset_terminal(vc, do_clear);
+}
+
+/*
+ * This routine initializes console interrupts, and does nothing
+ * else. If you want the screen to clear, call tty_write with
+ * the appropriate escape-sequence.
+ */
+
+static int __init con_init(void)
+{
+        const char *display_desc = NULL;
+        struct vc_data *vc;
+        unsigned int currcons = 0, i;
+
+        console_lock();
+
+        if (conswitchp)
+                display_desc = conswitchp->con_startup();
+        if (!display_desc) {
+                fg_console = 0;
+                console_unlock();
+                return 0;
+        }
+
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                struct con_driver *con_driver = &registered_con_driver[i];
+
+                if (con_driver->con == NULL) {
+                        con_driver->con = conswitchp;
+                        con_driver->desc = display_desc;
+                        con_driver->flag = CON_DRIVER_FLAG_INIT;
+                        con_driver->first = 0;
+                        con_driver->last = MAX_NR_CONSOLES - 1;
+                        break;
+                }
+        }
+
+        for (i = 0; i < MAX_NR_CONSOLES; i++)
+                con_driver_map[i] = conswitchp;
+
+        if (blankinterval) {
+                blank_state = blank_normal_wait;
+                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+        }
+
+        for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
+                vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
+                INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+                tty_port_init(&vc->port);
+                visual_init(vc, currcons, 1);
+                vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
+                vc_init(vc, vc->vc_rows, vc->vc_cols,
+                        currcons || !vc->vc_sw->con_save_screen);
+        }
+        currcons = fg_console = 0;
+        master_display_fg = vc = vc_cons[currcons].d;
+        set_origin(vc);
+        save_screen(vc);
+        gotoxy(vc, vc->vc_x, vc->vc_y);
+        csi_J(vc, 0);
+        update_screen(vc);
+        pr_info("Console: %s %s %dx%d",
+                vc->vc_can_do_color ? "colour" : "mono",
+                display_desc, vc->vc_cols, vc->vc_rows);
+        printable = 1;
+        printk("\n");
+
+        console_unlock();
+
+#ifdef CONFIG_VT_CONSOLE
+        register_console(&vt_console_driver);
+#endif
+        return 0;
+}
+console_initcall(con_init);
+
+static const struct tty_operations con_ops = {
+        .open = con_open,
+        .close = con_close,
+        .write = con_write,
+        .write_room = con_write_room,
+        .put_char = con_put_char,
+        .flush_chars = con_flush_chars,
+        .chars_in_buffer = con_chars_in_buffer,
+        .ioctl = vt_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl = vt_compat_ioctl,
+#endif
+        .stop = con_stop,
+        .start = con_start,
+        .throttle = con_throttle,
+        .unthrottle = con_unthrottle,
+        .resize = vt_resize,
+        .shutdown = con_shutdown
+};
+
+static struct cdev vc0_cdev;
+
+static ssize_t show_tty_active(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "tty%d\n", fg_console + 1);
+}
+static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
+
+int __init vty_init(const struct file_operations *console_fops)
+{
+        cdev_init(&vc0_cdev, console_fops);
+        if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
+            register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
+                panic("Couldn't register /dev/tty0 driver\n");
+        tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
+        if (IS_ERR(tty0dev))
+                tty0dev = NULL;
+        else
+                WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
+
+        vcs_init();
+
+        console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
+        if (!console_driver)
+                panic("Couldn't allocate console driver\n");
+        console_driver->owner = THIS_MODULE;
+        console_driver->name = "tty";
+        console_driver->name_base = 1;
+        console_driver->major = TTY_MAJOR;
+        console_driver->minor_start = 1;
+        console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
+        console_driver->init_termios = tty_std_termios;
+        if (default_utf8)
+                console_driver->init_termios.c_iflag |= IUTF8;
+        console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
+        tty_set_operations(console_driver, &con_ops);
+        if (tty_register_driver(console_driver))
+                panic("Couldn't register console driver\n");
+        kbd_init();
+        console_map_init();
+#ifdef CONFIG_MDA_CONSOLE
+        mda_console_init();
+#endif
+        return 0;
+}
+
+#ifndef VT_SINGLE_DRIVER
+
+static struct class *vtconsole_class;
+
+static int bind_con_driver(const struct consw *csw, int first, int last,
+                           int deflt)
+{
+        struct module *owner = csw->owner;
+        const char *desc = NULL;
+        struct con_driver *con_driver;
+        int i, j = -1, k = -1, retval = -ENODEV;
+
+        if (!try_module_get(owner))
+                return -ENODEV;
+
+        console_lock();
+
+        /* check if driver is registered */
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                con_driver = &registered_con_driver[i];
+
+                if (con_driver->con == csw) {
+                        desc = con_driver->desc;
+                        retval = 0;
+                        break;
+                }
+        }
+
+        if (retval)
+                goto err;
+
+        if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
+                csw->con_startup();
+                con_driver->flag |= CON_DRIVER_FLAG_INIT;
+        }
+
+        if (deflt) {
+                if (conswitchp)
+                        module_put(conswitchp->owner);
+
+                __module_get(owner);
+                conswitchp = csw;
+        }
+
+        first = max(first, con_driver->first);
+        last = min(last, con_driver->last);
+
+        for (i = first; i <= last; i++) {
+                int old_was_color;
+                struct vc_data *vc = vc_cons[i].d;
+
+                if (con_driver_map[i])
+                        module_put(con_driver_map[i]->owner);
+                __module_get(owner);
+                con_driver_map[i] = csw;
+
+                if (!vc || !vc->vc_sw)
+                        continue;
+
+                j = i;
+
+                if (CON_IS_VISIBLE(vc)) {
+                        k = i;
+                        save_screen(vc);
+                }
+
+                old_was_color = vc->vc_can_do_color;
+                vc->vc_sw->con_deinit(vc);
+                vc->vc_origin = (unsigned long)vc->vc_screenbuf;
+                visual_init(vc, i, 0);
+                set_origin(vc);
+                update_attr(vc);
+
+                /* If the console changed between mono <-> color, then
+                 * the attributes in the screenbuf will be wrong.  The
+                 * following resets all attributes to something sane.
+                 */
+                if (old_was_color != vc->vc_can_do_color)
+                        clear_buffer_attributes(vc);
+        }
+
+        pr_info("Console: switching ");
+        if (!deflt)
+                printk("consoles %d-%d ", first+1, last+1);
+        if (j >= 0) {
+                struct vc_data *vc = vc_cons[j].d;
+
+                printk("to %s %s %dx%d\n",
+                       vc->vc_can_do_color ? "colour" : "mono",
+                       desc, vc->vc_cols, vc->vc_rows);
+
+                if (k >= 0) {
+                        vc = vc_cons[k].d;
+                        update_screen(vc);
+                }
+        } else
+                printk("to %s\n", desc);
+
+        retval = 0;
+err:
+        console_unlock();
+        module_put(owner);
+        return retval;
+};
+
+#ifdef CONFIG_VT_HW_CONSOLE_BINDING
+static int con_is_graphics(const struct consw *csw, int first, int last)
+{
+        int i, retval = 0;
+
+        for (i = first; i <= last; i++) {
+                struct vc_data *vc = vc_cons[i].d;
+
+                if (vc && vc->vc_mode == KD_GRAPHICS) {
+                        retval = 1;
+                        break;
+                }
+        }
+
+        return retval;
+}
+
+/**
+ * unbind_con_driver - unbind a console driver
+ * @csw: pointer to console driver to unregister
+ * @first: first in range of consoles that @csw should be unbound from
+ * @last: last in range of consoles that @csw should be unbound from
+ * @deflt: should next bound console driver be default after @csw is unbound?
+ *
+ * To unbind a driver from all possible consoles, pass 0 as @first and
+ * %MAX_NR_CONSOLES as @last.
+ *
+ * @deflt controls whether the console that ends up replacing @csw should be
+ * the default console.
+ *
+ * RETURNS:
+ * -ENODEV if @csw isn't a registered console driver or can't be unregistered
+ * or 0 on success.
+ */
+int unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
+{
+        struct module *owner = csw->owner;
+        const struct consw *defcsw = NULL;
+        struct con_driver *con_driver = NULL, *con_back = NULL;
+        int i, retval = -ENODEV;
+
+        if (!try_module_get(owner))
+                return -ENODEV;
+
+        console_lock();
+
+        /* check if driver is registered and if it is unbindable */
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                con_driver = &registered_con_driver[i];
+
+                if (con_driver->con == csw &&
+                    con_driver->flag & CON_DRIVER_FLAG_MODULE) {
+                        retval = 0;
+                        break;
+                }
+        }
+
+        if (retval) {
+                console_unlock();
+                goto err;
+        }
+
+        retval = -ENODEV;
+
+        /* check if backup driver exists */
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                con_back = &registered_con_driver[i];
+
+                if (con_back->con &&
+                    !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
+                        defcsw = con_back->con;
+                        retval = 0;
+                        break;
+                }
+        }
+
+        if (retval) {
+                console_unlock();
+                goto err;
+        }
+
+        if (!con_is_bound(csw)) {
+                console_unlock();
+                goto err;
+        }
+
+        first = max(first, con_driver->first);
+        last = min(last, con_driver->last);
+
+        for (i = first; i <= last; i++) {
+                if (con_driver_map[i] == csw) {
+                        module_put(csw->owner);
+                        con_driver_map[i] = NULL;
+                }
+        }
+
+        if (!con_is_bound(defcsw)) {
+                const struct consw *defconsw = conswitchp;
+
+                defcsw->con_startup();
+                con_back->flag |= CON_DRIVER_FLAG_INIT;
+                /*
+                 * vgacon may change the default driver to point
+                 * to dummycon, we restore it here...
+                 */
+                conswitchp = defconsw;
+        }
+
+        if (!con_is_bound(csw))
+                con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
+
+        console_unlock();
+        /* ignore return value, binding should not fail */
+        bind_con_driver(defcsw, first, last, deflt);
+err:
+        module_put(owner);
+        return retval;
+
+}
+EXPORT_SYMBOL(unbind_con_driver);
+
+static int vt_bind(struct con_driver *con)
+{
+        const struct consw *defcsw = NULL, *csw = NULL;
+        int i, more = 1, first = -1, last = -1, deflt = 0;
+
+        if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
+            con_is_graphics(con->con, con->first, con->last))
+                goto err;
+
+        csw = con->con;
+
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                struct con_driver *con = &registered_con_driver[i];
+
+                if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
+                        defcsw = con->con;
+                        break;
+                }
+        }
+
+        if (!defcsw)
+                goto err;
+
+        while (more) {
+                more = 0;
+
+                for (i = con->first; i <= con->last; i++) {
+                        if (con_driver_map[i] == defcsw) {
+                                if (first == -1)
+                                        first = i;
+                                last = i;
+                                more = 1;
+                        } else if (first != -1)
+                                break;
+                }
+
+                if (first == 0 && last == MAX_NR_CONSOLES -1)
+                        deflt = 1;
+
+                if (first != -1)
+                        bind_con_driver(csw, first, last, deflt);
+
+                first = -1;
+                last = -1;
+                deflt = 0;
+        }
+
+err:
+        return 0;
+}
+
+static int vt_unbind(struct con_driver *con)
+{
+        const struct consw *csw = NULL;
+        int i, more = 1, first = -1, last = -1, deflt = 0;
+
+        if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
+            con_is_graphics(con->con, con->first, con->last))
+                goto err;
+
+        csw = con->con;
+
+        while (more) {
+                more = 0;
+
+                for (i = con->first; i <= con->last; i++) {
+                        if (con_driver_map[i] == csw) {
+                                if (first == -1)
+                                        first = i;
+                                last = i;
+                                more = 1;
+                        } else if (first != -1)
+                                break;
+                }
+
+                if (first == 0 && last == MAX_NR_CONSOLES -1)
+                        deflt = 1;
+
+                if (first != -1)
+                        unbind_con_driver(csw, first, last, deflt);
+
+                first = -1;
+                last = -1;
+                deflt = 0;
+        }
+
+err:
+        return 0;
+}
+#else
+static inline int vt_bind(struct con_driver *con)
+{
+        return 0;
+}
+static inline int vt_unbind(struct con_driver *con)
+{
+        return 0;
+}
+#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
+
+static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
+                          const char *buf, size_t count)
+{
+        struct con_driver *con = dev_get_drvdata(dev);
+        int bind = simple_strtoul(buf, NULL, 0);
+
+        if (bind)
+                vt_bind(con);
+        else
+                vt_unbind(con);
+
+        return count;
+}
+
+static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct con_driver *con = dev_get_drvdata(dev);
+        int bind = con_is_bound(con->con);
+
+        return snprintf(buf, PAGE_SIZE, "%i\n", bind);
+}
+
+static ssize_t show_name(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+        struct con_driver *con = dev_get_drvdata(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%s %s\n",
+                        (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
+                         con->desc);
+
+}
+
+static struct device_attribute device_attrs[] = {
+        __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
+        __ATTR(name, S_IRUGO, show_name, NULL),
+};
+
+static int vtconsole_init_device(struct con_driver *con)
+{
+        int i;
+        int error = 0;
+
+        con->flag |= CON_DRIVER_FLAG_ATTR;
+        dev_set_drvdata(con->dev, con);
+        for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
+                error = device_create_file(con->dev, &device_attrs[i]);
+                if (error)
+                        break;
+        }
+
+        if (error) {
+                while (--i >= 0)
+                        device_remove_file(con->dev, &device_attrs[i]);
+                con->flag &= ~CON_DRIVER_FLAG_ATTR;
+        }
+
+        return error;
+}
+
+static void vtconsole_deinit_device(struct con_driver *con)
+{
+        int i;
+
+        if (con->flag & CON_DRIVER_FLAG_ATTR) {
+                for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
+                        device_remove_file(con->dev, &device_attrs[i]);
+                con->flag &= ~CON_DRIVER_FLAG_ATTR;
+        }
+}
+
+/**
+ * con_is_bound - checks if driver is bound to the console
+ * @csw: console driver
+ *
+ * RETURNS: zero if unbound, nonzero if bound
+ *
+ * Drivers can call this and if zero, they should release
+ * all resources allocated on con_startup()
+ */
+int con_is_bound(const struct consw *csw)
+{
+        int i, bound = 0;
+
+        for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                if (con_driver_map[i] == csw) {
+                        bound = 1;
+                        break;
+                }
+        }
+
+        return bound;
+}
+EXPORT_SYMBOL(con_is_bound);
+
+/**
+ * con_debug_enter - prepare the console for the kernel debugger
+ * @sw: console driver
+ *
+ * Called when the console is taken over by the kernel debugger, this
+ * function needs to save the current console state, then put the console
+ * into a state suitable for the kernel debugger.
+ *
+ * RETURNS:
+ * Zero on success, nonzero if a failure occurred when trying to prepare
+ * the console for the debugger.
+ */
+int con_debug_enter(struct vc_data *vc)
+{
+        int ret = 0;
+
+        saved_fg_console = fg_console;
+        saved_last_console = last_console;
+        saved_want_console = want_console;
+        saved_vc_mode = vc->vc_mode;
+        saved_console_blanked = console_blanked;
+        vc->vc_mode = KD_TEXT;
+        console_blanked = 0;
+        if (vc->vc_sw->con_debug_enter)
+                ret = vc->vc_sw->con_debug_enter(vc);
+#ifdef CONFIG_KGDB_KDB
+        /* Set the initial LINES variable if it is not already set */
+        if (vc->vc_rows < 999) {
+                int linecount;
+                char lns[4];
+                const char *setargs[3] = {
+                        "set",
+                        "LINES",
+                        lns,
+                };
+                if (kdbgetintenv(setargs[0], &linecount)) {
+                        snprintf(lns, 4, "%i", vc->vc_rows);
+                        kdb_set(2, setargs);
+                }
+        }
+#endif /* CONFIG_KGDB_KDB */
+        return ret;
+}
+EXPORT_SYMBOL_GPL(con_debug_enter);
+
+/**
+ * con_debug_leave - restore console state
+ * @sw: console driver
+ *
+ * Restore the console state to what it was before the kernel debugger
+ * was invoked.
+ *
+ * RETURNS:
+ * Zero on success, nonzero if a failure occurred when trying to restore
+ * the console.
+ */
+int con_debug_leave(void)
+{
+        struct vc_data *vc;
+        int ret = 0;
+
+        fg_console = saved_fg_console;
+        last_console = saved_last_console;
+        want_console = saved_want_console;
+        console_blanked = saved_console_blanked;
+        vc_cons[fg_console].d->vc_mode = saved_vc_mode;
+
+        vc = vc_cons[fg_console].d;
+        if (vc->vc_sw->con_debug_leave)
+                ret = vc->vc_sw->con_debug_leave(vc);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(con_debug_leave);
+
+/**
+ * register_con_driver - register console driver to console layer
+ * @csw: console driver
+ * @first: the first console to take over, minimum value is 0
+ * @last: the last console to take over, maximum value is MAX_NR_CONSOLES -1
+ *
+ * DESCRIPTION: This function registers a console driver which can later
+ * bind to a range of consoles specified by @first and @last. It will
+ * also initialize the console driver by calling con_startup().
+ */
+int register_con_driver(const struct consw *csw, int first, int last)
+{
+        struct module *owner = csw->owner;
+        struct con_driver *con_driver;
+        const char *desc;
+        int i, retval = 0;
+
+        if (!try_module_get(owner))
+                return -ENODEV;
+
+        console_lock();
+
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                con_driver = &registered_con_driver[i];
+
+                /* already registered */
+                if (con_driver->con == csw)
+                        retval = -EBUSY;
+        }
+
+        if (retval)
+                goto err;
+
+        desc = csw->con_startup();
+
+        if (!desc)
+                goto err;
+
+        retval = -EINVAL;
+
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                con_driver = &registered_con_driver[i];
+
+                if (con_driver->con == NULL) {
+                        con_driver->con = csw;
+                        con_driver->desc = desc;
+                        con_driver->node = i;
+                        con_driver->flag = CON_DRIVER_FLAG_MODULE |
+                                           CON_DRIVER_FLAG_INIT;
+                        con_driver->first = first;
+                        con_driver->last = last;
+                        retval = 0;
+                        break;
+                }
+        }
+
+        if (retval)
+                goto err;
+
+        con_driver->dev = device_create(vtconsole_class, NULL,
+                                                MKDEV(0, con_driver->node),
+                                                NULL, "vtcon%i",
+                                                con_driver->node);
+
+        if (IS_ERR(con_driver->dev)) {
+                printk(KERN_WARNING "Unable to create device for %s; "
+                       "errno = %ld\n", con_driver->desc,
+                       PTR_ERR(con_driver->dev));
+                con_driver->dev = NULL;
+        } else {
+                vtconsole_init_device(con_driver);
+        }
+
+err:
+        console_unlock();
+        module_put(owner);
+        return retval;
+}
+EXPORT_SYMBOL(register_con_driver);
+
+/**
+ * unregister_con_driver - unregister console driver from console layer
+ * @csw: console driver
+ *
+ * DESCRIPTION: All drivers that registers to the console layer must
+ * call this function upon exit, or if the console driver is in a state
+ * where it won't be able to handle console services, such as the
+ * framebuffer console without loaded framebuffer drivers.
+ *
+ * The driver must unbind first prior to unregistration.
+ */
+int unregister_con_driver(const struct consw *csw)
+{
+        int i, retval = -ENODEV;
+
+        console_lock();
+
+        /* cannot unregister a bound driver */
+        if (con_is_bound(csw))
+                goto err;
+
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                struct con_driver *con_driver = &registered_con_driver[i];
+
+                if (con_driver->con == csw &&
+                    con_driver->flag & CON_DRIVER_FLAG_MODULE) {
+                        vtconsole_deinit_device(con_driver);
+                        device_destroy(vtconsole_class,
+                                       MKDEV(0, con_driver->node));
+                        con_driver->con = NULL;
+                        con_driver->desc = NULL;
+                        con_driver->dev = NULL;
+                        con_driver->node = 0;
+                        con_driver->flag = 0;
+                        con_driver->first = 0;
+                        con_driver->last = 0;
+                        retval = 0;
+                        break;
+                }
+        }
+err:
+        console_unlock();
+        return retval;
+}
+EXPORT_SYMBOL(unregister_con_driver);
+
+/*
+ *      If we support more console drivers, this function is used
+ *      when a driver wants to take over some existing consoles
+ *      and become default driver for newly opened ones.
+ *
+ *      take_over_console is basically a register followed by unbind
+ */
+int take_over_console(const struct consw *csw, int first, int last, int deflt)
+{
+        int err;
+
+        err = register_con_driver(csw, first, last);
+        /* if we get an busy error we still want to bind the console driver
+         * and return success, as we may have unbound the console driver
+         * but not unregistered it.
+        */
+        if (err == -EBUSY)
+                err = 0;
+        if (!err)
+                bind_con_driver(csw, first, last, deflt);
+
+        return err;
+}
+
+/*
+ * give_up_console is a wrapper to unregister_con_driver. It will only
+ * work if driver is fully unbound.
+ */
+void give_up_console(const struct consw *csw)
+{
+        unregister_con_driver(csw);
+}
+
+static int __init vtconsole_class_init(void)
+{
+        int i;
+
+        vtconsole_class = class_create(THIS_MODULE, "vtconsole");
+        if (IS_ERR(vtconsole_class)) {
+                printk(KERN_WARNING "Unable to create vt console class; "
+                       "errno = %ld\n", PTR_ERR(vtconsole_class));
+                vtconsole_class = NULL;
+        }
+
+        /* Add system drivers to sysfs */
+        for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+                struct con_driver *con = &registered_con_driver[i];
+
+                if (con->con && !con->dev) {
+                        con->dev = device_create(vtconsole_class, NULL,
+                                                         MKDEV(0, con->node),
+                                                         NULL, "vtcon%i",
+                                                         con->node);
+
+                        if (IS_ERR(con->dev)) {
+                                printk(KERN_WARNING "Unable to create "
+                                       "device for %s; errno = %ld\n",
+                                       con->desc, PTR_ERR(con->dev));
+                                con->dev = NULL;
+                        } else {
+                                vtconsole_init_device(con);
+                        }
+                }
+        }
+
+        return 0;
+}
+postcore_initcall(vtconsole_class_init);
+
+#endif
+
+/*
+ *      Screen blanking
+ */
+
+static int set_vesa_blanking(char __user *p)
+{
+        unsigned int mode;
+
+        if (get_user(mode, p + 1))
+                return -EFAULT;
+
+        vesa_blank_mode = (mode < 4) ? mode : 0;
+        return 0;
+}
+
+void do_blank_screen(int entering_gfx)
+{
+        struct vc_data *vc = vc_cons[fg_console].d;
+        int i;
+
+        WARN_CONSOLE_UNLOCKED();
+
+        if (console_blanked) {
+                if (blank_state == blank_vesa_wait) {
+                        blank_state = blank_off;
+                        vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
+                }
+                return;
+        }
+
+        /* entering graphics mode? */
+        if (entering_gfx) {
+                hide_cursor(vc);
+                save_screen(vc);
+                vc->vc_sw->con_blank(vc, -1, 1);
+                console_blanked = fg_console + 1;
+                blank_state = blank_off;
+                set_origin(vc);
+                return;
+        }
+
+        if (blank_state != blank_normal_wait)
+                return;
+        blank_state = blank_off;
+
+        /* don't blank graphics */
+        if (vc->vc_mode != KD_TEXT) {
+                console_blanked = fg_console + 1;
+                return;
+        }
+
+        hide_cursor(vc);
+        del_timer_sync(&console_timer);
+        blank_timer_expired = 0;
+
+        save_screen(vc);
+        /* In case we need to reset origin, blanking hook returns 1 */
+        i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
+        console_blanked = fg_console + 1;
+        if (i)
+                set_origin(vc);
+
+        if (console_blank_hook && console_blank_hook(1))
+                return;
+
+        if (vesa_off_interval && vesa_blank_mode) {
+                blank_state = blank_vesa_wait;
+                mod_timer(&console_timer, jiffies + vesa_off_interval);
+        }
+        vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
+}
+EXPORT_SYMBOL(do_blank_screen);
+
+/*
+ * Called by timer as well as from vt_console_driver
+ */
+void do_unblank_screen(int leaving_gfx)
+{
+        struct vc_data *vc;
+
+        /* This should now always be called from a "sane" (read: can schedule)
+         * context for the sake of the low level drivers, except in the special
+         * case of oops_in_progress
+         */
+        if (!oops_in_progress)
+                might_sleep();
+
+        WARN_CONSOLE_UNLOCKED();
+
+        ignore_poke = 0;
+        if (!console_blanked)
+                return;
+        if (!vc_cons_allocated(fg_console)) {
+                /* impossible */
+                pr_warning("unblank_screen: tty %d not allocated ??\n",
+                           fg_console+1);
+                return;
+        }
+        vc = vc_cons[fg_console].d;
+        /* Try to unblank in oops case too */
+        if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
+                return; /* but leave console_blanked != 0 */
+
+        if (blankinterval) {
+                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+                blank_state = blank_normal_wait;
+        }
+
+        console_blanked = 0;
+        if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
+                /* Low-level driver cannot restore -> do it ourselves */
+                update_screen(vc);
+        if (console_blank_hook)
+                console_blank_hook(0);
+        set_palette(vc);
+        set_cursor(vc);
+        vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
+}
+EXPORT_SYMBOL(do_unblank_screen);
+
+/*
+ * This is called by the outside world to cause a forced unblank, mostly for
+ * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
+ * call it with 1 as an argument and so force a mode restore... that may kill
+ * X or at least garbage the screen but would also make the Oops visible...
+ */
+void unblank_screen(void)
+{
+        do_unblank_screen(0);
+}
+
+/*
+ * We defer the timer blanking to work queue so it can take the console mutex
+ * (console operations can still happen at irq time, but only from printk which
+ * has the console mutex. Not perfect yet, but better than no locking
+ */
+static void blank_screen_t(unsigned long dummy)
+{
+        if (unlikely(!keventd_up())) {
+                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+                return;
+        }
+        blank_timer_expired = 1;
+        schedule_work(&console_work);
+}
+
+void poke_blanked_console(void)
+{
+        WARN_CONSOLE_UNLOCKED();
+
+        /* Add this so we quickly catch whoever might call us in a non
+         * safe context. Nowadays, unblank_screen() isn't to be called in
+         * atomic contexts and is allowed to schedule (with the special case
+         * of oops_in_progress, but that isn't of any concern for this
+         * function. --BenH.
+         */
+        might_sleep();
+
+        /* This isn't perfectly race free, but a race here would be mostly harmless,
+         * at worse, we'll do a spurrious blank and it's unlikely
+         */
+        del_timer(&console_timer);
+        blank_timer_expired = 0;
+
+        if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
+                return;
+        if (console_blanked)
+                unblank_screen();
+        else if (blankinterval) {
+                mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+                blank_state = blank_normal_wait;
+        }
+}
+
+/*
+ *      Palettes
+ */
+
+static void set_palette(struct vc_data *vc)
+{
+        WARN_CONSOLE_UNLOCKED();
+
+        if (vc->vc_mode != KD_GRAPHICS)
+                vc->vc_sw->con_set_palette(vc, color_table);
+}
+
+static int set_get_cmap(unsigned char __user *arg, int set)
+{
+    int i, j, k;
+
+    WARN_CONSOLE_UNLOCKED();
+
+    for (i = 0; i < 16; i++)
+        if (set) {
+            get_user(default_red[i], arg++);
+            get_user(default_grn[i], arg++);
+            get_user(default_blu[i], arg++);
+        } else {
+            put_user(default_red[i], arg++);
+            put_user(default_grn[i], arg++);
+            put_user(default_blu[i], arg++);
+        }
+    if (set) {
+        for (i = 0; i < MAX_NR_CONSOLES; i++)
+            if (vc_cons_allocated(i)) {
+                for (j = k = 0; j < 16; j++) {
+                    vc_cons[i].d->vc_palette[k++] = default_red[j];
+                    vc_cons[i].d->vc_palette[k++] = default_grn[j];
+                    vc_cons[i].d->vc_palette[k++] = default_blu[j];
+                }
+                set_palette(vc_cons[i].d);
+            }
+    }
+    return 0;
+}
+
+/*
+ * Load palette into the DAC registers. arg points to a colour
+ * map, 3 bytes per colour, 16 colours, range from 0 to 255.
+ */
+
+int con_set_cmap(unsigned char __user *arg)
+{
+        int rc;
+
+        console_lock();
+        rc = set_get_cmap (arg,1);
+        console_unlock();
+
+        return rc;
+}
+
+int con_get_cmap(unsigned char __user *arg)
+{
+        int rc;
+
+        console_lock();
+        rc = set_get_cmap (arg,0);
+        console_unlock();
+
+        return rc;
+}
+
+void reset_palette(struct vc_data *vc)
+{
+        int j, k;
+        for (j=k=0; j<16; j++) {
+                vc->vc_palette[k++] = default_red[j];
+                vc->vc_palette[k++] = default_grn[j];
+                vc->vc_palette[k++] = default_blu[j];
+        }
+        set_palette(vc);
+}
+
+/*
+ *  Font switching
+ *
+ *  Currently we only support fonts up to 32 pixels wide, at a maximum height
+ *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints, 
+ *  depending on width) reserved for each character which is kinda wasty, but 
+ *  this is done in order to maintain compatibility with the EGA/VGA fonts. It 
+ *  is up to the actual low-level console-driver convert data into its favorite
+ *  format (maybe we should add a `fontoffset' field to the `display'
+ *  structure so we won't have to convert the fontdata all the time.
+ *  /Jes
+ */
+
+#define max_font_size 65536
+
+static int con_font_get(struct vc_data *vc, struct console_font_op *op)
+{
+        struct console_font font;
+        int rc = -EINVAL;
+        int c;
+
+        if (vc->vc_mode != KD_TEXT)
+                return -EINVAL;
+
+        if (op->data) {
+                font.data = kmalloc(max_font_size, GFP_KERNEL);
+                if (!font.data)
+                        return -ENOMEM;
+        } else
+                font.data = NULL;
+
+        console_lock();
+        if (vc->vc_sw->con_font_get)
+                rc = vc->vc_sw->con_font_get(vc, &font);
+        else
+                rc = -ENOSYS;
+        console_unlock();
+
+        if (rc)
+                goto out;
+
+        c = (font.width+7)/8 * 32 * font.charcount;
+
+        if (op->data && font.charcount > op->charcount)
+                rc = -ENOSPC;
+        if (!(op->flags & KD_FONT_FLAG_OLD)) {
+                if (font.width > op->width || font.height > op->height) 
+                        rc = -ENOSPC;
+        } else {
+                if (font.width != 8)
+                        rc = -EIO;
+                else if ((op->height && font.height > op->height) ||
+                         font.height > 32)
+                        rc = -ENOSPC;
+        }
+        if (rc)
+                goto out;
+
+        op->height = font.height;
+        op->width = font.width;
+        op->charcount = font.charcount;
+
+        if (op->data && copy_to_user(op->data, font.data, c))
+                rc = -EFAULT;
+
+out:
+        kfree(font.data);
+        return rc;
+}
+
+static int con_font_set(struct vc_data *vc, struct console_font_op *op)
+{
+        struct console_font font;
+        int rc = -EINVAL;
+        int size;
+
+        if (vc->vc_mode != KD_TEXT)
+                return -EINVAL;
+        if (!op->data)
+                return -EINVAL;
+        if (op->charcount > 512)
+                return -EINVAL;
+        if (!op->height) {              /* Need to guess font height [compat] */
+                int h, i;
+                u8 __user *charmap = op->data;
+                u8 tmp;
+                
+                /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
+                   so that we can get rid of this soon */
+                if (!(op->flags & KD_FONT_FLAG_OLD))
+                        return -EINVAL;
+                for (h = 32; h > 0; h--)
+                        for (i = 0; i < op->charcount; i++) {
+                                if (get_user(tmp, &charmap[32*i+h-1]))
+                                        return -EFAULT;
+                                if (tmp)
+                                        goto nonzero;
+                        }
+                return -EINVAL;
+        nonzero:
+                op->height = h;
+        }
+        if (op->width <= 0 || op->width > 32 || op->height > 32)
+                return -EINVAL;
+        size = (op->width+7)/8 * 32 * op->charcount;
+        if (size > max_font_size)
+                return -ENOSPC;
+        font.charcount = op->charcount;
+        font.height = op->height;
+        font.width = op->width;
+        font.data = memdup_user(op->data, size);
+        if (IS_ERR(font.data))
+                return PTR_ERR(font.data);
+        console_lock();
+        if (vc->vc_sw->con_font_set)
+                rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
+        else
+                rc = -ENOSYS;
+        console_unlock();
+        kfree(font.data);
+        return rc;
+}
+
+static int con_font_default(struct vc_data *vc, struct console_font_op *op)
+{
+        struct console_font font = {.width = op->width, .height = op->height};
+        char name[MAX_FONT_NAME];
+        char *s = name;
+        int rc;
+
+        if (vc->vc_mode != KD_TEXT)
+                return -EINVAL;
+
+        if (!op->data)
+                s = NULL;
+        else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
+                return -EFAULT;
+        else
+                name[MAX_FONT_NAME - 1] = 0;
+
+        console_lock();
+        if (vc->vc_sw->con_font_default)
+                rc = vc->vc_sw->con_font_default(vc, &font, s);
+        else
+                rc = -ENOSYS;
+        console_unlock();
+        if (!rc) {
+                op->width = font.width;
+                op->height = font.height;
+        }
+        return rc;
+}
+
+static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
+{
+        int con = op->height;
+        int rc;
+
+        if (vc->vc_mode != KD_TEXT)
+                return -EINVAL;
+
+        console_lock();
+        if (!vc->vc_sw->con_font_copy)
+                rc = -ENOSYS;
+        else if (con < 0 || !vc_cons_allocated(con))
+                rc = -ENOTTY;
+        else if (con == vc->vc_num)     /* nothing to do */
+                rc = 0;
+        else
+                rc = vc->vc_sw->con_font_copy(vc, con);
+        console_unlock();
+        return rc;
+}
+
+int con_font_op(struct vc_data *vc, struct console_font_op *op)
+{
+        switch (op->op) {
+        case KD_FONT_OP_SET:
+                return con_font_set(vc, op);
+        case KD_FONT_OP_GET:
+                return con_font_get(vc, op);
+        case KD_FONT_OP_SET_DEFAULT:
+                return con_font_default(vc, op);
+        case KD_FONT_OP_COPY:
+                return con_font_copy(vc, op);
+        }
+        return -ENOSYS;
+}
+
+/*
+ *      Interface exported to selection and vcs.
+ */
+
+/* used by selection */
+u16 screen_glyph(struct vc_data *vc, int offset)
+{
+        u16 w = scr_readw(screenpos(vc, offset, 1));
+        u16 c = w & 0xff;
+
+        if (w & vc->vc_hi_font_mask)
+                c |= 0x100;
+        return c;
+}
+EXPORT_SYMBOL_GPL(screen_glyph);
+
+/* used by vcs - note the word offset */
+unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
+{
+        return screenpos(vc, 2 * w_offset, viewed);
+}
+
+void getconsxy(struct vc_data *vc, unsigned char *p)
+{
+        p[0] = vc->vc_x;
+        p[1] = vc->vc_y;
+}
+
+void putconsxy(struct vc_data *vc, unsigned char *p)
+{
+        hide_cursor(vc);
+        gotoxy(vc, p[0], p[1]);
+        set_cursor(vc);
+}
+
+u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
+{
+        if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
+                return softcursor_original;
+        return scr_readw(org);
+}
+
+void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
+{
+        scr_writew(val, org);
+        if ((unsigned long)org == vc->vc_pos) {
+                softcursor_original = -1;
+                add_softcursor(vc);
+        }
+}
+
+void vcs_scr_updated(struct vc_data *vc)
+{
+        notify_update(vc);
+}
+
+/*
+ *      Visible symbols for modules
+ */
+
+EXPORT_SYMBOL(color_table);
+EXPORT_SYMBOL(default_red);
+EXPORT_SYMBOL(default_grn);
+EXPORT_SYMBOL(default_blu);
+EXPORT_SYMBOL(update_region);
+EXPORT_SYMBOL(redraw_screen);
+EXPORT_SYMBOL(vc_resize);
+EXPORT_SYMBOL(fg_console);
+EXPORT_SYMBOL(console_blank_hook);
+EXPORT_SYMBOL(console_blanked);
+EXPORT_SYMBOL(vc_cons);
+EXPORT_SYMBOL(global_cursor_default);
+#ifndef VT_SINGLE_DRIVER
+EXPORT_SYMBOL(take_over_console);
+EXPORT_SYMBOL(give_up_console);
+#endif
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
new file mode 100644
index 000000000000..5e096f43bcea
--- /dev/null
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -0,0 +1,1800 @@
+/*
+ *  Copyright (C) 1992 obz under the linux copyright
+ *
+ *  Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
+ *  Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
+ *  Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
+ *  Some code moved for less code duplication - Andi Kleen - Mar 1997
+ *  Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/tty.h>
+#include <linux/timer.h>
+#include <linux/kernel.h>
+#include <linux/compat.h>
+#include <linux/module.h>
+#include <linux/kd.h>
+#include <linux/vt.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/console.h>
+#include <linux/consolemap.h>
+#include <linux/signal.h>
+#include <linux/timex.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include <linux/kbd_kern.h>
+#include <linux/vt_kern.h>
+#include <linux/kbd_diacr.h>
+#include <linux/selection.h>
+
+char vt_dont_switch;
+extern struct tty_driver *console_driver;
+
+#define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
+#define VT_BUSY(i)      (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
+
+/*
+ * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
+ * experimentation and study of X386 SYSV handling.
+ *
+ * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
+ * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
+ * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
+ * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
+ * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
+ * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
+ * to the current console is done by the main ioctl code.
+ */
+
+#ifdef CONFIG_X86
+#include <linux/syscalls.h>
+#endif
+
+static void complete_change_console(struct vc_data *vc);
+
+/*
+ *      User space VT_EVENT handlers
+ */
+
+struct vt_event_wait {
+        struct list_head list;
+        struct vt_event event;
+        int done;
+};
+
+static LIST_HEAD(vt_events);
+static DEFINE_SPINLOCK(vt_event_lock);
+static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
+
+/**
+ *      vt_event_post
+ *      @event: the event that occurred
+ *      @old: old console
+ *      @new: new console
+ *
+ *      Post an VT event to interested VT handlers
+ */
+
+void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
+{
+        struct list_head *pos, *head;
+        unsigned long flags;
+        int wake = 0;
+
+        spin_lock_irqsave(&vt_event_lock, flags);
+        head = &vt_events;
+
+        list_for_each(pos, head) {
+                struct vt_event_wait *ve = list_entry(pos,
+                                                struct vt_event_wait, list);
+                if (!(ve->event.event & event))
+                        continue;
+                ve->event.event = event;
+                /* kernel view is consoles 0..n-1, user space view is
+                   console 1..n with 0 meaning current, so we must bias */
+                ve->event.oldev = old + 1;
+                ve->event.newev = new + 1;
+                wake = 1;
+                ve->done = 1;
+        }
+        spin_unlock_irqrestore(&vt_event_lock, flags);
+        if (wake)
+                wake_up_interruptible(&vt_event_waitqueue);
+}
+
+/**
+ *      vt_event_wait           -       wait for an event
+ *      @vw: our event
+ *
+ *      Waits for an event to occur which completes our vt_event_wait
+ *      structure. On return the structure has wv->done set to 1 for success
+ *      or 0 if some event such as a signal ended the wait.
+ */
+
+static void vt_event_wait(struct vt_event_wait *vw)
+{
+        unsigned long flags;
+        /* Prepare the event */
+        INIT_LIST_HEAD(&vw->list);
+        vw->done = 0;
+        /* Queue our event */
+        spin_lock_irqsave(&vt_event_lock, flags);
+        list_add(&vw->list, &vt_events);
+        spin_unlock_irqrestore(&vt_event_lock, flags);
+        /* Wait for it to pass */
+        wait_event_interruptible_tty(vt_event_waitqueue, vw->done);
+        /* Dequeue it */
+        spin_lock_irqsave(&vt_event_lock, flags);
+        list_del(&vw->list);
+        spin_unlock_irqrestore(&vt_event_lock, flags);
+}
+
+/**
+ *      vt_event_wait_ioctl     -       event ioctl handler
+ *      @arg: argument to ioctl
+ *
+ *      Implement the VT_WAITEVENT ioctl using the VT event interface
+ */
+
+static int vt_event_wait_ioctl(struct vt_event __user *event)
+{
+        struct vt_event_wait vw;
+
+        if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
+                return -EFAULT;
+        /* Highest supported event for now */
+        if (vw.event.event & ~VT_MAX_EVENT)
+                return -EINVAL;
+
+        vt_event_wait(&vw);
+        /* If it occurred report it */
+        if (vw.done) {
+                if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
+                        return -EFAULT;
+                return 0;
+        }
+        return -EINTR;
+}
+
+/**
+ *      vt_waitactive   -       active console wait
+ *      @event: event code
+ *      @n: new console
+ *
+ *      Helper for event waits. Used to implement the legacy
+ *      event waiting ioctls in terms of events
+ */
+
+int vt_waitactive(int n)
+{
+        struct vt_event_wait vw;
+        do {
+                if (n == fg_console + 1)
+                        break;
+                vw.event.event = VT_EVENT_SWITCH;
+                vt_event_wait(&vw);
+                if (vw.done == 0)
+                        return -EINTR;
+        } while (vw.event.newev != n);
+        return 0;
+}
+
+/*
+ * these are the valid i/o ports we're allowed to change. they map all the
+ * video ports
+ */
+#define GPFIRST 0x3b4
+#define GPLAST 0x3df
+#define GPNUM (GPLAST - GPFIRST + 1)
+
+#define i (tmp.kb_index)
+#define s (tmp.kb_table)
+#define v (tmp.kb_value)
+static inline int
+do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
+{
+        struct kbentry tmp;
+        ushort *key_map, val, ov;
+
+        if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
+                return -EFAULT;
+
+        if (!capable(CAP_SYS_TTY_CONFIG))
+                perm = 0;
+
+        switch (cmd) {
+        case KDGKBENT:
+                key_map = key_maps[s];
+                if (key_map) {
+                    val = U(key_map[i]);
+                    if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
+                        val = K_HOLE;
+                } else
+                    val = (i ? K_HOLE : K_NOSUCHMAP);
+                return put_user(val, &user_kbe->kb_value);
+        case KDSKBENT:
+                if (!perm)
+                        return -EPERM;
+                if (!i && v == K_NOSUCHMAP) {
+                        /* deallocate map */
+                        key_map = key_maps[s];
+                        if (s && key_map) {
+                            key_maps[s] = NULL;
+                            if (key_map[0] == U(K_ALLOCATED)) {
+                                        kfree(key_map);
+                                        keymap_count--;
+                            }
+                        }
+                        break;
+                }
+
+                if (KTYP(v) < NR_TYPES) {
+                    if (KVAL(v) > max_vals[KTYP(v)])
+                                return -EINVAL;
+                } else
+                    if (kbd->kbdmode != VC_UNICODE)
+                                return -EINVAL;
+
+                /* ++Geert: non-PC keyboards may generate keycode zero */
+#if !defined(__mc68000__) && !defined(__powerpc__)
+                /* assignment to entry 0 only tests validity of args */
+                if (!i)
+                        break;
+#endif
+
+                if (!(key_map = key_maps[s])) {
+                        int j;
+
+                        if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
+                            !capable(CAP_SYS_RESOURCE))
+                                return -EPERM;
+
+                        key_map = kmalloc(sizeof(plain_map),
+                                                     GFP_KERNEL);
+                        if (!key_map)
+                                return -ENOMEM;
+                        key_maps[s] = key_map;
+                        key_map[0] = U(K_ALLOCATED);
+                        for (j = 1; j < NR_KEYS; j++)
+                                key_map[j] = U(K_HOLE);
+                        keymap_count++;
+                }
+                ov = U(key_map[i]);
+                if (v == ov)
+                        break;  /* nothing to do */
+                /*
+                 * Attention Key.
+                 */
+                if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
+                        return -EPERM;
+                key_map[i] = U(v);
+                if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
+                        compute_shiftstate();
+                break;
+        }
+        return 0;
+}
+#undef i
+#undef s
+#undef v
+
+static inline int 
+do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
+{
+        struct kbkeycode tmp;
+        int kc = 0;
+
+        if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
+                return -EFAULT;
+        switch (cmd) {
+        case KDGETKEYCODE:
+                kc = getkeycode(tmp.scancode);
+                if (kc >= 0)
+                        kc = put_user(kc, &user_kbkc->keycode);
+                break;
+        case KDSETKEYCODE:
+                if (!perm)
+                        return -EPERM;
+                kc = setkeycode(tmp.scancode, tmp.keycode);
+                break;
+        }
+        return kc;
+}
+
+static inline int
+do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
+{
+        struct kbsentry *kbs;
+        char *p;
+        u_char *q;
+        u_char __user *up;
+        int sz;
+        int delta;
+        char *first_free, *fj, *fnw;
+        int i, j, k;
+        int ret;
+
+        if (!capable(CAP_SYS_TTY_CONFIG))
+                perm = 0;
+
+        kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
+        if (!kbs) {
+                ret = -ENOMEM;
+                goto reterr;
+        }
+
+        /* we mostly copy too much here (512bytes), but who cares ;) */
+        if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
+                ret = -EFAULT;
+                goto reterr;
+        }
+        kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
+        i = kbs->kb_func;
+
+        switch (cmd) {
+        case KDGKBSENT:
+                sz = sizeof(kbs->kb_string) - 1; /* sz should have been
+                                                  a struct member */
+                up = user_kdgkb->kb_string;
+                p = func_table[i];
+                if(p)
+                        for ( ; *p && sz; p++, sz--)
+                                if (put_user(*p, up++)) {
+                                        ret = -EFAULT;
+                                        goto reterr;
+                                }
+                if (put_user('\0', up)) {
+                        ret = -EFAULT;
+                        goto reterr;
+                }
+                kfree(kbs);
+                return ((p && *p) ? -EOVERFLOW : 0);
+        case KDSKBSENT:
+                if (!perm) {
+                        ret = -EPERM;
+                        goto reterr;
+                }
+
+                q = func_table[i];
+                first_free = funcbufptr + (funcbufsize - funcbufleft);
+                for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) 
+                        ;
+                if (j < MAX_NR_FUNC)
+                        fj = func_table[j];
+                else
+                        fj = first_free;
+
+                delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
+                if (delta <= funcbufleft) {     /* it fits in current buf */
+                    if (j < MAX_NR_FUNC) {
+                        memmove(fj + delta, fj, first_free - fj);
+                        for (k = j; k < MAX_NR_FUNC; k++)
+                            if (func_table[k])
+                                func_table[k] += delta;
+                    }
+                    if (!q)
+                      func_table[i] = fj;
+                    funcbufleft -= delta;
+                } else {                        /* allocate a larger buffer */
+                    sz = 256;
+                    while (sz < funcbufsize - funcbufleft + delta)
+                      sz <<= 1;
+                    fnw = kmalloc(sz, GFP_KERNEL);
+                    if(!fnw) {
+                      ret = -ENOMEM;
+                      goto reterr;
+                    }
+
+                    if (!q)
+                      func_table[i] = fj;
+                    if (fj > funcbufptr)
+                        memmove(fnw, funcbufptr, fj - funcbufptr);
+                    for (k = 0; k < j; k++)
+                      if (func_table[k])
+                        func_table[k] = fnw + (func_table[k] - funcbufptr);
+
+                    if (first_free > fj) {
+                        memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
+                        for (k = j; k < MAX_NR_FUNC; k++)
+                          if (func_table[k])
+                            func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
+                    }
+                    if (funcbufptr != func_buf)
+                      kfree(funcbufptr);
+                    funcbufptr = fnw;
+                    funcbufleft = funcbufleft - delta + sz - funcbufsize;
+                    funcbufsize = sz;
+                }
+                strcpy(func_table[i], kbs->kb_string);
+                break;
+        }
+        ret = 0;
+reterr:
+        kfree(kbs);
+        return ret;
+}
+
+static inline int 
+do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
+{
+        struct consolefontdesc cfdarg;
+        int i;
+
+        if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) 
+                return -EFAULT;
+        
+        switch (cmd) {
+        case PIO_FONTX:
+                if (!perm)
+                        return -EPERM;
+                op->op = KD_FONT_OP_SET;
+                op->flags = KD_FONT_FLAG_OLD;
+                op->width = 8;
+                op->height = cfdarg.charheight;
+                op->charcount = cfdarg.charcount;
+                op->data = cfdarg.chardata;
+                return con_font_op(vc_cons[fg_console].d, op);
+        case GIO_FONTX: {
+                op->op = KD_FONT_OP_GET;
+                op->flags = KD_FONT_FLAG_OLD;
+                op->width = 8;
+                op->height = cfdarg.charheight;
+                op->charcount = cfdarg.charcount;
+                op->data = cfdarg.chardata;
+                i = con_font_op(vc_cons[fg_console].d, op);
+                if (i)
+                        return i;
+                cfdarg.charheight = op->height;
+                cfdarg.charcount = op->charcount;
+                if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
+                        return -EFAULT;
+                return 0;
+                }
+        }
+        return -EINVAL;
+}
+
+static inline int 
+do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
+{
+        struct unimapdesc tmp;
+
+        if (copy_from_user(&tmp, user_ud, sizeof tmp))
+                return -EFAULT;
+        if (tmp.entries)
+                if (!access_ok(VERIFY_WRITE, tmp.entries,
+                                tmp.entry_ct*sizeof(struct unipair)))
+                        return -EFAULT;
+        switch (cmd) {
+        case PIO_UNIMAP:
+                if (!perm)
+                        return -EPERM;
+                return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
+        case GIO_UNIMAP:
+                if (!perm && fg_console != vc->vc_num)
+                        return -EPERM;
+                return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
+        }
+        return 0;
+}
+
+
+
+/*
+ * We handle the console-specific ioctl's here.  We allow the
+ * capability to modify any console, not just the fg_console. 
+ */
+int vt_ioctl(struct tty_struct *tty,
+             unsigned int cmd, unsigned long arg)
+{
+        struct vc_data *vc = tty->driver_data;
+        struct console_font_op op;      /* used in multiple places here */
+        struct kbd_struct * kbd;
+        unsigned int console;
+        unsigned char ucval;
+        unsigned int uival;
+        void __user *up = (void __user *)arg;
+        int i, perm;
+        int ret = 0;
+
+        console = vc->vc_num;
+
+        tty_lock();
+
+        if (!vc_cons_allocated(console)) {      /* impossible? */
+                ret = -ENOIOCTLCMD;
+                goto out;
+        }
+
+
+        /*
+         * To have permissions to do most of the vt ioctls, we either have
+         * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
+         */
+        perm = 0;
+        if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
+                perm = 1;
+ 
+        kbd = kbd_table + console;
+        switch (cmd) {
+        case TIOCLINUX:
+                ret = tioclinux(tty, arg);
+                break;
+        case KIOCSOUND:
+                if (!perm)
+                        goto eperm;
+                /*
+                 * The use of PIT_TICK_RATE is historic, it used to be
+                 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
+                 * and 2.6.36, which was a minor but unfortunate ABI
+                 * change.
+                 */
+                if (arg)
+                        arg = PIT_TICK_RATE / arg;
+                kd_mksound(arg, 0);
+                break;
+
+        case KDMKTONE:
+                if (!perm)
+                        goto eperm;
+        {
+                unsigned int ticks, count;
+                
+                /*
+                 * Generate the tone for the appropriate number of ticks.
+                 * If the time is zero, turn off sound ourselves.
+                 */
+                ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
+                count = ticks ? (arg & 0xffff) : 0;
+                if (count)
+                        count = PIT_TICK_RATE / count;
+                kd_mksound(count, ticks);
+                break;
+        }
+
+        case KDGKBTYPE:
+                /*
+                 * this is naive.
+                 */
+                ucval = KB_101;
+                goto setchar;
+
+                /*
+                 * These cannot be implemented on any machine that implements
+                 * ioperm() in user level (such as Alpha PCs) or not at all.
+                 *
+                 * XXX: you should never use these, just call ioperm directly..
+                 */
+#ifdef CONFIG_X86
+        case KDADDIO:
+        case KDDELIO:
+                /*
+                 * KDADDIO and KDDELIO may be able to add ports beyond what
+                 * we reject here, but to be safe...
+                 */
+                if (arg < GPFIRST || arg > GPLAST) {
+                        ret = -EINVAL;
+                        break;
+                }
+                ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
+                break;
+
+        case KDENABIO:
+        case KDDISABIO:
+                ret = sys_ioperm(GPFIRST, GPNUM,
+                                  (cmd == KDENABIO)) ? -ENXIO : 0;
+                break;
+#endif
+
+        /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
+                
+        case KDKBDREP:
+        {
+                struct kbd_repeat kbrep;
+                
+                if (!capable(CAP_SYS_TTY_CONFIG))
+                        goto eperm;
+
+                if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
+                        ret =  -EFAULT;
+                        break;
+                }
+                ret = kbd_rate(&kbrep);
+                if (ret)
+                        break;
+                if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
+                        ret = -EFAULT;
+                break;
+        }
+
+        case KDSETMODE:
+                /*
+                 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
+                 * doesn't do a whole lot. i'm not sure if it should do any
+                 * restoration of modes or what...
+                 *
+                 * XXX It should at least call into the driver, fbdev's definitely
+                 * need to restore their engine state. --BenH
+                 */
+                if (!perm)
+                        goto eperm;
+                switch (arg) {
+                case KD_GRAPHICS:
+                        break;
+                case KD_TEXT0:
+                case KD_TEXT1:
+                        arg = KD_TEXT;
+                case KD_TEXT:
+                        break;
+                default:
+                        ret = -EINVAL;
+                        goto out;
+                }
+                if (vc->vc_mode == (unsigned char) arg)
+                        break;
+                vc->vc_mode = (unsigned char) arg;
+                if (console != fg_console)
+                        break;
+                /*
+                 * explicitly blank/unblank the screen if switching modes
+                 */
+                console_lock();
+                if (arg == KD_TEXT)
+                        do_unblank_screen(1);
+                else
+                        do_blank_screen(1);
+                console_unlock();
+                break;
+
+        case KDGETMODE:
+                uival = vc->vc_mode;
+                goto setint;
+
+        case KDMAPDISP:
+        case KDUNMAPDISP:
+                /*
+                 * these work like a combination of mmap and KDENABIO.
+                 * this could be easily finished.
+                 */
+                ret = -EINVAL;
+                break;
+
+        case KDSKBMODE:
+                if (!perm)
+                        goto eperm;
+                switch(arg) {
+                  case K_RAW:
+                        kbd->kbdmode = VC_RAW;
+                        break;
+                  case K_MEDIUMRAW:
+                        kbd->kbdmode = VC_MEDIUMRAW;
+                        break;
+                  case K_XLATE:
+                        kbd->kbdmode = VC_XLATE;
+                        compute_shiftstate();
+                        break;
+                  case K_UNICODE:
+                        kbd->kbdmode = VC_UNICODE;
+                        compute_shiftstate();
+                        break;
+                  case K_OFF:
+                        kbd->kbdmode = VC_OFF;
+                        break;
+                  default:
+                        ret = -EINVAL;
+                        goto out;
+                }
+                tty_ldisc_flush(tty);
+                break;
+
+        case KDGKBMODE:
+                switch (kbd->kbdmode) {
+                case VC_RAW:
+                        uival = K_RAW;
+                        break;
+                case VC_MEDIUMRAW:
+                        uival = K_MEDIUMRAW;
+                        break;
+                case VC_UNICODE:
+                        uival = K_UNICODE;
+                        break;
+                case VC_OFF:
+                        uival = K_OFF;
+                        break;
+                default:
+                        uival = K_XLATE;
+                        break;
+                }
+                goto setint;
+
+        /* this could be folded into KDSKBMODE, but for compatibility
+           reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
+        case KDSKBMETA:
+                switch(arg) {
+                  case K_METABIT:
+                        clr_vc_kbd_mode(kbd, VC_META);
+                        break;
+                  case K_ESCPREFIX:
+                        set_vc_kbd_mode(kbd, VC_META);
+                        break;
+                  default:
+                        ret = -EINVAL;
+                }
+                break;
+
+        case KDGKBMETA:
+                uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
+        setint:
+                ret = put_user(uival, (int __user *)arg);
+                break;
+
+        case KDGETKEYCODE:
+        case KDSETKEYCODE:
+                if(!capable(CAP_SYS_TTY_CONFIG))
+                        perm = 0;
+                ret = do_kbkeycode_ioctl(cmd, up, perm);
+                break;
+
+        case KDGKBENT:
+        case KDSKBENT:
+                ret = do_kdsk_ioctl(cmd, up, perm, kbd);
+                break;
+
+        case KDGKBSENT:
+        case KDSKBSENT:
+                ret = do_kdgkb_ioctl(cmd, up, perm);
+                break;
+
+        case KDGKBDIACR:
+        {
+                struct kbdiacrs __user *a = up;
+                struct kbdiacr diacr;
+                int i;
+
+                if (put_user(accent_table_size, &a->kb_cnt)) {
+                        ret = -EFAULT;
+                        break;
+                }
+                for (i = 0; i < accent_table_size; i++) {
+                        diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
+                        diacr.base = conv_uni_to_8bit(accent_table[i].base);
+                        diacr.result = conv_uni_to_8bit(accent_table[i].result);
+                        if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
+                                ret = -EFAULT;
+                                break;
+                        }
+                }
+                break;
+        }
+        case KDGKBDIACRUC:
+        {
+                struct kbdiacrsuc __user *a = up;
+
+                if (put_user(accent_table_size, &a->kb_cnt))
+                        ret = -EFAULT;
+                else if (copy_to_user(a->kbdiacruc, accent_table,
+                                accent_table_size*sizeof(struct kbdiacruc)))
+                        ret = -EFAULT;
+                break;
+        }
+
+        case KDSKBDIACR:
+        {
+                struct kbdiacrs __user *a = up;
+                struct kbdiacr diacr;
+                unsigned int ct;
+                int i;
+
+                if (!perm)
+                        goto eperm;
+                if (get_user(ct,&a->kb_cnt)) {
+                        ret = -EFAULT;
+                        break;
+                }
+                if (ct >= MAX_DIACR) {
+                        ret = -EINVAL;
+                        break;
+                }
+                accent_table_size = ct;
+                for (i = 0; i < ct; i++) {
+                        if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
+                                ret = -EFAULT;
+                                break;
+                        }
+                        accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
+                        accent_table[i].base = conv_8bit_to_uni(diacr.base);
+                        accent_table[i].result = conv_8bit_to_uni(diacr.result);
+                }
+                break;
+        }
+
+        case KDSKBDIACRUC:
+        {
+                struct kbdiacrsuc __user *a = up;
+                unsigned int ct;
+
+                if (!perm)
+                        goto eperm;
+                if (get_user(ct,&a->kb_cnt)) {
+                        ret = -EFAULT;
+                        break;
+                }
+                if (ct >= MAX_DIACR) {
+                        ret = -EINVAL;
+                        break;
+                }
+                accent_table_size = ct;
+                if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
+                        ret = -EFAULT;
+                break;
+        }
+
+        /* the ioctls below read/set the flags usually shown in the leds */
+        /* don't use them - they will go away without warning */
+        case KDGKBLED:
+                ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
+                goto setchar;
+
+        case KDSKBLED:
+                if (!perm)
+                        goto eperm;
+                if (arg & ~0x77) {
+                        ret = -EINVAL;
+                        break;
+                }
+                kbd->ledflagstate = (arg & 7);
+                kbd->default_ledflagstate = ((arg >> 4) & 7);
+                set_leds();
+                break;
+
+        /* the ioctls below only set the lights, not the functions */
+        /* for those, see KDGKBLED and KDSKBLED above */
+        case KDGETLED:
+                ucval = getledstate();
+        setchar:
+                ret = put_user(ucval, (char __user *)arg);
+                break;
+
+        case KDSETLED:
+                if (!perm)
+                        goto eperm;
+                setledstate(kbd, arg);
+                break;
+
+        /*
+         * A process can indicate its willingness to accept signals
+         * generated by pressing an appropriate key combination.
+         * Thus, one can have a daemon that e.g. spawns a new console
+         * upon a keypress and then changes to it.
+         * See also the kbrequest field of inittab(5).
+         */
+        case KDSIGACCEPT:
+        {
+                if (!perm || !capable(CAP_KILL))
+                        goto eperm;
+                if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
+                        ret = -EINVAL;
+                else {
+                        spin_lock_irq(&vt_spawn_con.lock);
+                        put_pid(vt_spawn_con.pid);
+                        vt_spawn_con.pid = get_pid(task_pid(current));
+                        vt_spawn_con.sig = arg;
+                        spin_unlock_irq(&vt_spawn_con.lock);
+                }
+                break;
+        }
+
+        case VT_SETMODE:
+        {
+                struct vt_mode tmp;
+
+                if (!perm)
+                        goto eperm;
+                if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
+                        ret = -EFAULT;
+                        goto out;
+                }
+                if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
+                        ret = -EINVAL;
+                        goto out;
+                }
+                console_lock();
+                vc->vt_mode = tmp;
+                /* the frsig is ignored, so we set it to 0 */
+                vc->vt_mode.frsig = 0;
+                put_pid(vc->vt_pid);
+                vc->vt_pid = get_pid(task_pid(current));
+                /* no switch is required -- saw@shade.msu.ru */
+                vc->vt_newvt = -1;
+                console_unlock();
+                break;
+        }
+
+        case VT_GETMODE:
+        {
+                struct vt_mode tmp;
+                int rc;
+
+                console_lock();
+                memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
+                console_unlock();
+
+                rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
+                if (rc)
+                        ret = -EFAULT;
+                break;
+        }
+
+        /*
+         * Returns global vt state. Note that VT 0 is always open, since
+         * it's an alias for the current VT, and people can't use it here.
+         * We cannot return state for more than 16 VTs, since v_state is short.
+         */
+        case VT_GETSTATE:
+        {
+                struct vt_stat __user *vtstat = up;
+                unsigned short state, mask;
+
+                if (put_user(fg_console + 1, &vtstat->v_active))
+                        ret = -EFAULT;
+                else {
+                        state = 1;      /* /dev/tty0 is always open */
+                        for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
+                                                        ++i, mask <<= 1)
+                                if (VT_IS_IN_USE(i))
+                                        state |= mask;
+                        ret = put_user(state, &vtstat->v_state);
+                }
+                break;
+        }
+
+        /*
+         * Returns the first available (non-opened) console.
+         */
+        case VT_OPENQRY:
+                for (i = 0; i < MAX_NR_CONSOLES; ++i)
+                        if (! VT_IS_IN_USE(i))
+                                break;
+                uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
+                goto setint;             
+
+        /*
+         * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
+         * with num >= 1 (switches to vt 0, our console, are not allowed, just
+         * to preserve sanity).
+         */
+        case VT_ACTIVATE:
+                if (!perm)
+                        goto eperm;
+                if (arg == 0 || arg > MAX_NR_CONSOLES)
+                        ret =  -ENXIO;
+                else {
+                        arg--;
+                        console_lock();
+                        ret = vc_allocate(arg);
+                        console_unlock();
+                        if (ret)
+                                break;
+                        set_console(arg);
+                }
+                break;
+
+        case VT_SETACTIVATE:
+        {
+                struct vt_setactivate vsa;
+
+                if (!perm)
+                        goto eperm;
+
+                if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
+                                        sizeof(struct vt_setactivate))) {
+                        ret = -EFAULT;
+                        goto out;
+                }
+                if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
+                        ret = -ENXIO;
+                else {
+                        vsa.console--;
+                        console_lock();
+                        ret = vc_allocate(vsa.console);
+                        if (ret == 0) {
+                                struct vc_data *nvc;
+                                /* This is safe providing we don't drop the
+                                   console sem between vc_allocate and
+                                   finishing referencing nvc */
+                                nvc = vc_cons[vsa.console].d;
+                                nvc->vt_mode = vsa.mode;
+                                nvc->vt_mode.frsig = 0;
+                                put_pid(nvc->vt_pid);
+                                nvc->vt_pid = get_pid(task_pid(current));
+                        }
+                        console_unlock();
+                        if (ret)
+                                break;
+                        /* Commence switch and lock */
+                        set_console(vsa.console);
+                }
+                break;
+        }
+
+        /*
+         * wait until the specified VT has been activated
+         */
+        case VT_WAITACTIVE:
+                if (!perm)
+                        goto eperm;
+                if (arg == 0 || arg > MAX_NR_CONSOLES)
+                        ret = -ENXIO;
+                else
+                        ret = vt_waitactive(arg);
+                break;
+
+        /*
+         * If a vt is under process control, the kernel will not switch to it
+         * immediately, but postpone the operation until the process calls this
+         * ioctl, allowing the switch to complete.
+         *
+         * According to the X sources this is the behavior:
+         *      0:      pending switch-from not OK
+         *      1:      pending switch-from OK
+         *      2:      completed switch-to OK
+         */
+        case VT_RELDISP:
+                if (!perm)
+                        goto eperm;
+
+                if (vc->vt_mode.mode != VT_PROCESS) {
+                        ret = -EINVAL;
+                        break;
+                }
+                /*
+                 * Switching-from response
+                 */
+                console_lock();
+                if (vc->vt_newvt >= 0) {
+                        if (arg == 0)
+                                /*
+                                 * Switch disallowed, so forget we were trying
+                                 * to do it.
+                                 */
+                                vc->vt_newvt = -1;
+
+                        else {
+                                /*
+                                 * The current vt has been released, so
+                                 * complete the switch.
+                                 */
+                                int newvt;
+                                newvt = vc->vt_newvt;
+                                vc->vt_newvt = -1;
+                                ret = vc_allocate(newvt);
+                                if (ret) {
+                                        console_unlock();
+                                        break;
+                                }
+                                /*
+                                 * When we actually do the console switch,
+                                 * make sure we are atomic with respect to
+                                 * other console switches..
+                                 */
+                                complete_change_console(vc_cons[newvt].d);
+                        }
+                } else {
+                        /*
+                         * Switched-to response
+                         */
+                        /*
+                         * If it's just an ACK, ignore it
+                         */
+                        if (arg != VT_ACKACQ)
+                                ret = -EINVAL;
+                }
+                console_unlock();
+                break;
+
+         /*
+          * Disallocate memory associated to VT (but leave VT1)
+          */
+         case VT_DISALLOCATE:
+                if (arg > MAX_NR_CONSOLES) {
+                        ret = -ENXIO;
+                        break;
+                }
+                if (arg == 0) {
+                    /* deallocate all unused consoles, but leave 0 */
+                        console_lock();
+                        for (i=1; i<MAX_NR_CONSOLES; i++)
+                                if (! VT_BUSY(i))
+                                        vc_deallocate(i);
+                        console_unlock();
+                } else {
+                        /* deallocate a single console, if possible */
+                        arg--;
+                        if (VT_BUSY(arg))
+                                ret = -EBUSY;
+                        else if (arg) {                       /* leave 0 */
+                                console_lock();
+                                vc_deallocate(arg);
+                                console_unlock();
+                        }
+                }
+                break;
+
+        case VT_RESIZE:
+        {
+                struct vt_sizes __user *vtsizes = up;
+                struct vc_data *vc;
+
+                ushort ll,cc;
+                if (!perm)
+                        goto eperm;
+                if (get_user(ll, &vtsizes->v_rows) ||
+                    get_user(cc, &vtsizes->v_cols))
+                        ret = -EFAULT;
+                else {
+                        console_lock();
+                        for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                                vc = vc_cons[i].d;
+
+                                if (vc) {
+                                        vc->vc_resize_user = 1;
+                                        vc_resize(vc_cons[i].d, cc, ll);
+                                }
+                        }
+                        console_unlock();
+                }
+                break;
+        }
+
+        case VT_RESIZEX:
+        {
+                struct vt_consize __user *vtconsize = up;
+                ushort ll,cc,vlin,clin,vcol,ccol;
+                if (!perm)
+                        goto eperm;
+                if (!access_ok(VERIFY_READ, vtconsize,
+                                sizeof(struct vt_consize))) {
+                        ret = -EFAULT;
+                        break;
+                }
+                /* FIXME: Should check the copies properly */
+                __get_user(ll, &vtconsize->v_rows);
+                __get_user(cc, &vtconsize->v_cols);
+                __get_user(vlin, &vtconsize->v_vlin);
+                __get_user(clin, &vtconsize->v_clin);
+                __get_user(vcol, &vtconsize->v_vcol);
+                __get_user(ccol, &vtconsize->v_ccol);
+                vlin = vlin ? vlin : vc->vc_scan_lines;
+                if (clin) {
+                        if (ll) {
+                                if (ll != vlin/clin) {
+                                        /* Parameters don't add up */
+                                        ret = -EINVAL;
+                                        break;
+                                }
+                        } else 
+                                ll = vlin/clin;
+                }
+                if (vcol && ccol) {
+                        if (cc) {
+                                if (cc != vcol/ccol) {
+                                        ret = -EINVAL;
+                                        break;
+                                }
+                        } else
+                                cc = vcol/ccol;
+                }
+
+                if (clin > 32) {
+                        ret =  -EINVAL;
+                        break;
+                }
+                    
+                for (i = 0; i < MAX_NR_CONSOLES; i++) {
+                        if (!vc_cons[i].d)
+                                continue;
+                        console_lock();
+                        if (vlin)
+                                vc_cons[i].d->vc_scan_lines = vlin;
+                        if (clin)
+                                vc_cons[i].d->vc_font.height = clin;
+                        vc_cons[i].d->vc_resize_user = 1;
+                        vc_resize(vc_cons[i].d, cc, ll);
+                        console_unlock();
+                }
+                break;
+        }
+
+        case PIO_FONT: {
+                if (!perm)
+                        goto eperm;
+                op.op = KD_FONT_OP_SET;
+                op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
+                op.width = 8;
+                op.height = 0;
+                op.charcount = 256;
+                op.data = up;
+                ret = con_font_op(vc_cons[fg_console].d, &op);
+                break;
+        }
+
+        case GIO_FONT: {
+                op.op = KD_FONT_OP_GET;
+                op.flags = KD_FONT_FLAG_OLD;
+                op.width = 8;
+                op.height = 32;
+                op.charcount = 256;
+                op.data = up;
+                ret = con_font_op(vc_cons[fg_console].d, &op);
+                break;
+        }
+
+        case PIO_CMAP:
+                if (!perm)
+                        ret = -EPERM;
+                else
+                        ret = con_set_cmap(up);
+                break;
+
+        case GIO_CMAP:
+                ret = con_get_cmap(up);
+                break;
+
+        case PIO_FONTX:
+        case GIO_FONTX:
+                ret = do_fontx_ioctl(cmd, up, perm, &op);
+                break;
+
+        case PIO_FONTRESET:
+        {
+                if (!perm)
+                        goto eperm;
+
+#ifdef BROKEN_GRAPHICS_PROGRAMS
+                /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
+                   font is not saved. */
+                ret = -ENOSYS;
+                break;
+#else
+                {
+                op.op = KD_FONT_OP_SET_DEFAULT;
+                op.data = NULL;
+                ret = con_font_op(vc_cons[fg_console].d, &op);
+                if (ret)
+                        break;
+                con_set_default_unimap(vc_cons[fg_console].d);
+                break;
+                }
+#endif
+        }
+
+        case KDFONTOP: {
+                if (copy_from_user(&op, up, sizeof(op))) {
+                        ret = -EFAULT;
+                        break;
+                }
+                if (!perm && op.op != KD_FONT_OP_GET)
+                        goto eperm;
+                ret = con_font_op(vc, &op);
+                if (ret)
+                        break;
+                if (copy_to_user(up, &op, sizeof(op)))
+                        ret = -EFAULT;
+                break;
+        }
+
+        case PIO_SCRNMAP:
+                if (!perm)
+                        ret = -EPERM;
+                else
+                        ret = con_set_trans_old(up);
+                break;
+
+        case GIO_SCRNMAP:
+                ret = con_get_trans_old(up);
+                break;
+
+        case PIO_UNISCRNMAP:
+                if (!perm)
+                        ret = -EPERM;
+                else
+                        ret = con_set_trans_new(up);
+                break;
+
+        case GIO_UNISCRNMAP:
+                ret = con_get_trans_new(up);
+                break;
+
+        case PIO_UNIMAPCLR:
+              { struct unimapinit ui;
+                if (!perm)
+                        goto eperm;
+                ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
+                if (ret)
+                        ret = -EFAULT;
+                else
+                        con_clear_unimap(vc, &ui);
+                break;
+              }
+
+        case PIO_UNIMAP:
+        case GIO_UNIMAP:
+                ret = do_unimap_ioctl(cmd, up, perm, vc);
+                break;
+
+        case VT_LOCKSWITCH:
+                if (!capable(CAP_SYS_TTY_CONFIG))
+                        goto eperm;
+                vt_dont_switch = 1;
+                break;
+        case VT_UNLOCKSWITCH:
+                if (!capable(CAP_SYS_TTY_CONFIG))
+                        goto eperm;
+                vt_dont_switch = 0;
+                break;
+        case VT_GETHIFONTMASK:
+                ret = put_user(vc->vc_hi_font_mask,
+                                        (unsigned short __user *)arg);
+                break;
+        case VT_WAITEVENT:
+                ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
+                break;
+        default:
+                ret = -ENOIOCTLCMD;
+        }
+out:
+        tty_unlock();
+        return ret;
+eperm:
+        ret = -EPERM;
+        goto out;
+}
+
+void reset_vc(struct vc_data *vc)
+{
+        vc->vc_mode = KD_TEXT;
+        kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
+        vc->vt_mode.mode = VT_AUTO;
+        vc->vt_mode.waitv = 0;
+        vc->vt_mode.relsig = 0;
+        vc->vt_mode.acqsig = 0;
+        vc->vt_mode.frsig = 0;
+        put_pid(vc->vt_pid);
+        vc->vt_pid = NULL;
+        vc->vt_newvt = -1;
+        if (!in_interrupt())    /* Via keyboard.c:SAK() - akpm */
+                reset_palette(vc);
+}
+
+void vc_SAK(struct work_struct *work)
+{
+        struct vc *vc_con =
+                container_of(work, struct vc, SAK_work);
+        struct vc_data *vc;
+        struct tty_struct *tty;
+
+        console_lock();
+        vc = vc_con->d;
+        if (vc) {
+                tty = vc->port.tty;
+                /*
+                 * SAK should also work in all raw modes and reset
+                 * them properly.
+                 */
+                if (tty)
+                        __do_SAK(tty);
+                reset_vc(vc);
+        }
+        console_unlock();
+}
+
+#ifdef CONFIG_COMPAT
+
+struct compat_consolefontdesc {
+        unsigned short charcount;       /* characters in font (256 or 512) */
+        unsigned short charheight;      /* scan lines per character (1-32) */
+        compat_caddr_t chardata;        /* font data in expanded form */
+};
+
+static inline int
+compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
+                         int perm, struct console_font_op *op)
+{
+        struct compat_consolefontdesc cfdarg;
+        int i;
+
+        if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
+                return -EFAULT;
+
+        switch (cmd) {
+        case PIO_FONTX:
+                if (!perm)
+                        return -EPERM;
+                op->op = KD_FONT_OP_SET;
+                op->flags = KD_FONT_FLAG_OLD;
+                op->width = 8;
+                op->height = cfdarg.charheight;
+                op->charcount = cfdarg.charcount;
+                op->data = compat_ptr(cfdarg.chardata);
+                return con_font_op(vc_cons[fg_console].d, op);
+        case GIO_FONTX:
+                op->op = KD_FONT_OP_GET;
+                op->flags = KD_FONT_FLAG_OLD;
+                op->width = 8;
+                op->height = cfdarg.charheight;
+                op->charcount = cfdarg.charcount;
+                op->data = compat_ptr(cfdarg.chardata);
+                i = con_font_op(vc_cons[fg_console].d, op);
+                if (i)
+                        return i;
+                cfdarg.charheight = op->height;
+                cfdarg.charcount = op->charcount;
+                if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
+                        return -EFAULT;
+                return 0;
+        }
+        return -EINVAL;
+}
+
+struct compat_console_font_op {
+        compat_uint_t op;        /* operation code KD_FONT_OP_* */
+        compat_uint_t flags;     /* KD_FONT_FLAG_* */
+        compat_uint_t width, height;     /* font size */
+        compat_uint_t charcount;
+        compat_caddr_t data;    /* font data with height fixed to 32 */
+};
+
+static inline int
+compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
+                         int perm, struct console_font_op *op, struct vc_data *vc)
+{
+        int i;
+
+        if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
+                return -EFAULT;
+        if (!perm && op->op != KD_FONT_OP_GET)
+                return -EPERM;
+        op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
+        op->flags |= KD_FONT_FLAG_OLD;
+        i = con_font_op(vc, op);
+        if (i)
+                return i;
+        ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
+        if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
+                return -EFAULT;
+        return 0;
+}
+
+struct compat_unimapdesc {
+        unsigned short entry_ct;
+        compat_caddr_t entries;
+};
+
+static inline int
+compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
+                         int perm, struct vc_data *vc)
+{
+        struct compat_unimapdesc tmp;
+        struct unipair __user *tmp_entries;
+
+        if (copy_from_user(&tmp, user_ud, sizeof tmp))
+                return -EFAULT;
+        tmp_entries = compat_ptr(tmp.entries);
+        if (tmp_entries)
+                if (!access_ok(VERIFY_WRITE, tmp_entries,
+                                tmp.entry_ct*sizeof(struct unipair)))
+                        return -EFAULT;
+        switch (cmd) {
+        case PIO_UNIMAP:
+                if (!perm)
+                        return -EPERM;
+                return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
+        case GIO_UNIMAP:
+                if (!perm && fg_console != vc->vc_num)
+                        return -EPERM;
+                return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
+        }
+        return 0;
+}
+
+long vt_compat_ioctl(struct tty_struct *tty,
+             unsigned int cmd, unsigned long arg)
+{
+        struct vc_data *vc = tty->driver_data;
+        struct console_font_op op;      /* used in multiple places here */
+        unsigned int console;
+        void __user *up = (void __user *)arg;
+        int perm;
+        int ret = 0;
+
+        console = vc->vc_num;
+
+        tty_lock();
+
+        if (!vc_cons_allocated(console)) {      /* impossible? */
+                ret = -ENOIOCTLCMD;
+                goto out;
+        }
+
+        /*
+         * To have permissions to do most of the vt ioctls, we either have
+         * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
+         */
+        perm = 0;
+        if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
+                perm = 1;
+
+        switch (cmd) {
+        /*
+         * these need special handlers for incompatible data structures
+         */
+        case PIO_FONTX:
+        case GIO_FONTX:
+                ret = compat_fontx_ioctl(cmd, up, perm, &op);
+                break;
+
+        case KDFONTOP:
+                ret = compat_kdfontop_ioctl(up, perm, &op, vc);
+                break;
+
+        case PIO_UNIMAP:
+        case GIO_UNIMAP:
+                ret = compat_unimap_ioctl(cmd, up, perm, vc);
+                break;
+
+        /*
+         * all these treat 'arg' as an integer
+         */
+        case KIOCSOUND:
+        case KDMKTONE:
+#ifdef CONFIG_X86
+        case KDADDIO:
+        case KDDELIO:
+#endif
+        case KDSETMODE:
+        case KDMAPDISP:
+        case KDUNMAPDISP:
+        case KDSKBMODE:
+        case KDSKBMETA:
+        case KDSKBLED:
+        case KDSETLED:
+        case KDSIGACCEPT:
+        case VT_ACTIVATE:
+        case VT_WAITACTIVE:
+        case VT_RELDISP:
+        case VT_DISALLOCATE:
+        case VT_RESIZE:
+        case VT_RESIZEX:
+                goto fallback;
+
+        /*
+         * the rest has a compatible data structure behind arg,
+         * but we have to convert it to a proper 64 bit pointer.
+         */
+        default:
+                arg = (unsigned long)compat_ptr(arg);
+                goto fallback;
+        }
+out:
+        tty_unlock();
+        return ret;
+
+fallback:
+        tty_unlock();
+        return vt_ioctl(tty, cmd, arg);
+}
+
+
+#endif /* CONFIG_COMPAT */
+
+
+/*
+ * Performs the back end of a vt switch. Called under the console
+ * semaphore.
+ */
+static void complete_change_console(struct vc_data *vc)
+{
+        unsigned char old_vc_mode;
+        int old = fg_console;
+
+        last_console = fg_console;
+
+        /*
+         * If we're switching, we could be going from KD_GRAPHICS to
+         * KD_TEXT mode or vice versa, which means we need to blank or
+         * unblank the screen later.
+         */
+        old_vc_mode = vc_cons[fg_console].d->vc_mode;
+        switch_screen(vc);
+
+        /*
+         * This can't appear below a successful kill_pid().  If it did,
+         * then the *blank_screen operation could occur while X, having
+         * received acqsig, is waking up on another processor.  This
+         * condition can lead to overlapping accesses to the VGA range
+         * and the framebuffer (causing system lockups).
+         *
+         * To account for this we duplicate this code below only if the
+         * controlling process is gone and we've called reset_vc.
+         */
+        if (old_vc_mode != vc->vc_mode) {
+                if (vc->vc_mode == KD_TEXT)
+                        do_unblank_screen(1);
+                else
+                        do_blank_screen(1);
+        }
+
+        /*
+         * If this new console is under process control, send it a signal
+         * telling it that it has acquired. Also check if it has died and
+         * clean up (similar to logic employed in change_console())
+         */
+        if (vc->vt_mode.mode == VT_PROCESS) {
+                /*
+                 * Send the signal as privileged - kill_pid() will
+                 * tell us if the process has gone or something else
+                 * is awry
+                 */
+                if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
+                /*
+                 * The controlling process has died, so we revert back to
+                 * normal operation. In this case, we'll also change back
+                 * to KD_TEXT mode. I'm not sure if this is strictly correct
+                 * but it saves the agony when the X server dies and the screen
+                 * remains blanked due to KD_GRAPHICS! It would be nice to do
+                 * this outside of VT_PROCESS but there is no single process
+                 * to account for and tracking tty count may be undesirable.
+                 */
+                        reset_vc(vc);
+
+                        if (old_vc_mode != vc->vc_mode) {
+                                if (vc->vc_mode == KD_TEXT)
+                                        do_unblank_screen(1);
+                                else
+                                        do_blank_screen(1);
+                        }
+                }
+        }
+
+        /*
+         * Wake anyone waiting for their VT to activate
+         */
+        vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
+        return;
+}
+
+/*
+ * Performs the front-end of a vt switch
+ */
+void change_console(struct vc_data *new_vc)
+{
+        struct vc_data *vc;
+
+        if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
+                return;
+
+        /*
+         * If this vt is in process mode, then we need to handshake with
+         * that process before switching. Essentially, we store where that
+         * vt wants to switch to and wait for it to tell us when it's done
+         * (via VT_RELDISP ioctl).
+         *
+         * We also check to see if the controlling process still exists.
+         * If it doesn't, we reset this vt to auto mode and continue.
+         * This is a cheap way to track process control. The worst thing
+         * that can happen is: we send a signal to a process, it dies, and
+         * the switch gets "lost" waiting for a response; hopefully, the
+         * user will try again, we'll detect the process is gone (unless
+         * the user waits just the right amount of time :-) and revert the
+         * vt to auto control.
+         */
+        vc = vc_cons[fg_console].d;
+        if (vc->vt_mode.mode == VT_PROCESS) {
+                /*
+                 * Send the signal as privileged - kill_pid() will
+                 * tell us if the process has gone or something else
+                 * is awry.
+                 *
+                 * We need to set vt_newvt *before* sending the signal or we
+                 * have a race.
+                 */
+                vc->vt_newvt = new_vc->vc_num;
+                if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
+                        /*
+                         * It worked. Mark the vt to switch to and
+                         * return. The process needs to send us a
+                         * VT_RELDISP ioctl to complete the switch.
+                         */
+                        return;
+                }
+
+                /*
+                 * The controlling process has died, so we revert back to
+                 * normal operation. In this case, we'll also change back
+                 * to KD_TEXT mode. I'm not sure if this is strictly correct
+                 * but it saves the agony when the X server dies and the screen
+                 * remains blanked due to KD_GRAPHICS! It would be nice to do
+                 * this outside of VT_PROCESS but there is no single process
+                 * to account for and tracking tty count may be undesirable.
+                 */
+                reset_vc(vc);
+
+                /*
+                 * Fall through to normal (VT_AUTO) handling of the switch...
+                 */
+        }
+
+        /*
+         * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
+         */
+        if (vc->vc_mode == KD_GRAPHICS)
+                return;
+
+        complete_change_console(new_vc);
+}
+
+/* Perform a kernel triggered VT switch for suspend/resume */
+
+static int disable_vt_switch;
+
+int vt_move_to_console(unsigned int vt, int alloc)
+{
+        int prev;
+
+        console_lock();
+        /* Graphics mode - up to X */
+        if (disable_vt_switch) {
+                console_unlock();
+                return 0;
+        }
+        prev = fg_console;
+
+        if (alloc && vc_allocate(vt)) {
+                /* we can't have a free VC for now. Too bad,
+                 * we don't want to mess the screen for now. */
+                console_unlock();
+                return -ENOSPC;
+        }
+
+        if (set_console(vt)) {
+                /*
+                 * We're unable to switch to the SUSPEND_CONSOLE.
+                 * Let the calling function know so it can decide
+                 * what to do.
+                 */
+                console_unlock();
+                return -EIO;
+        }
+        console_unlock();
+        tty_lock();
+        if (vt_waitactive(vt + 1)) {
+                pr_debug("Suspend: Can't switch VCs.");
+                tty_unlock();
+                return -EINTR;
+        }
+        tty_unlock();
+        return prev;
+}
+
+/*
+ * Normally during a suspend, we allocate a new console and switch to it.
+ * When we resume, we switch back to the original console.  This switch
+ * can be slow, so on systems where the framebuffer can handle restoration
+ * of video registers anyways, there's little point in doing the console
+ * switch.  This function allows you to disable it by passing it '0'.
+ */
+void pm_set_vt_switch(int do_switch)
+{
+        console_lock();
+        disable_vt_switch = !do_switch;
+        console_unlock();
+}
+EXPORT_SYMBOL(pm_set_vt_switch);