Merge branch 'mpi-master' into wip-k-fmlpwip-k-fmlp

Conflicts:
	litmus/sched_cedf.c

1 files changed, 2176 insertions, 0 deletions

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");