Merge tag 'tty-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver patches from Greg KH:
 "Here's the big tty/serial driver update for 3.20-rc1.  Nothing huge
  here, just lots of driver updates and some core tty layer fixes as
  well.  All have been in linux-next with no reported issues"

* tag 'tty-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (119 commits)
  serial: 8250: Fix UART_BUG_TXEN workaround
  serial: driver for ETRAX FS UART
  tty: remove unused variable sprop
  serial: of-serial: fetch line number from DT
  serial: samsung: earlycon support depends on CONFIG_SERIAL_SAMSUNG_CONSOLE
  tty/serial: serial8250_set_divisor() can be static
  tty/serial: Add Spreadtrum sc9836-uart driver support
  Documentation: DT: Add bindings for Spreadtrum SoC Platform
  serial: samsung: remove redundant interrupt enabling
  tty: Remove external interface for tty_set_termios()
  serial: omap: Fix RTS handling
  serial: 8250_omap: Use UPSTAT_AUTORTS for RTS handling
  serial: core: Rework hw-assisted flow control support
  tty/serial: 8250_early: Add support for PXA UARTs
  tty/serial: of_serial: add support for PXA/MMP uarts
  tty/serial: of_serial: add DT alias ID handling
  serial: 8250: Prevent concurrent updates to shadow registers
  serial: 8250: Use canary to restart console after suspend
  serial: 8250: Refactor XR17V35X divisor calculation
  serial: 8250: Refactor divisor programming
  ...

8 files changed, 98 insertions, 12 deletions

diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index 195aafc6cd07..6512e9cbc6d5 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -12,6 +12,7 @@
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/mod_devicetable.h>
+#include <linux/console.h>
 
 #define PNP_NAME_LEN            50
 
@@ -309,15 +310,22 @@ struct pnp_fixup {
 #define PNP_DISABLE             0x0004
 #define PNP_CONFIGURABLE        0x0008
 #define PNP_REMOVABLE           0x0010
+#define PNP_CONSOLE             0x0020
 
 #define pnp_can_read(dev)       (((dev)->protocol->get) && \
                                  ((dev)->capabilities & PNP_READ))
 #define pnp_can_write(dev)      (((dev)->protocol->set) && \
                                  ((dev)->capabilities & PNP_WRITE))
-#define pnp_can_disable(dev)    (((dev)->protocol->disable) && \
-                                 ((dev)->capabilities & PNP_DISABLE))
+#define pnp_can_disable(dev)    (((dev)->protocol->disable) &&            \
+                                 ((dev)->capabilities & PNP_DISABLE) &&   \
+                                 (!((dev)->capabilities & PNP_CONSOLE) || \
+                                  console_suspend_enabled))
 #define pnp_can_configure(dev)  ((!(dev)->active) && \
                                  ((dev)->capabilities & PNP_CONFIGURABLE))
+#define pnp_can_suspend(dev)    (((dev)->protocol->suspend) &&            \
+                                 (!((dev)->capabilities & PNP_CONSOLE) || \
+                                  console_suspend_enabled))
+
 
 #ifdef CONFIG_ISAPNP
 extern struct pnp_protocol isapnp_protocol;
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index e02acf0a0ec9..a8efa235b7c1 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -85,6 +85,9 @@ struct uart_8250_port {
         unsigned char           mcr_force;      /* mask of forced bits */
         unsigned char           cur_iotype;     /* Running I/O type */
         unsigned int            rpm_tx_active;
+        unsigned char           canary;         /* non-zero during system sleep
+                                                 *   if no_console_suspend
+                                                 */
 
         /*
          * Some bits in registers are cleared on a read, so they must
@@ -126,6 +129,7 @@ extern int serial8250_do_startup(struct uart_port *port);
 extern void serial8250_do_shutdown(struct uart_port *port);
 extern void serial8250_do_pm(struct uart_port *port, unsigned int state,
                              unsigned int oldstate);
+extern void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl);
 extern int fsl8250_handle_irq(struct uart_port *port);
 int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
 unsigned char serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 057038cf2788..baf3e1d08416 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -123,6 +123,7 @@ struct uart_port {
         void                    (*set_termios)(struct uart_port *,
                                                struct ktermios *new,
                                                struct ktermios *old);
+        void                    (*set_mctrl)(struct uart_port *, unsigned int);
         int                     (*startup)(struct uart_port *port);
         void                    (*shutdown)(struct uart_port *port);
         void                    (*throttle)(struct uart_port *port);
@@ -190,8 +191,10 @@ struct uart_port {
 #define UPF_NO_TXEN_TEST        ((__force upf_t) (1 << 15))
 #define UPF_MAGIC_MULTIPLIER    ((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ )
 
-/* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
-#define UPF_HARD_FLOW           ((__force upf_t) (1 << 21))
+/* Port has hardware-assisted h/w flow control */
+#define UPF_AUTO_CTS            ((__force upf_t) (1 << 20))
+#define UPF_AUTO_RTS            ((__force upf_t) (1 << 21))
+#define UPF_HARD_FLOW           ((__force upf_t) (UPF_AUTO_CTS | UPF_AUTO_RTS))
 /* Port has hardware-assisted s/w flow control */
 #define UPF_SOFT_FLOW           ((__force upf_t) (1 << 22))
 #define UPF_CONS_FLOW           ((__force upf_t) (1 << 23))
@@ -213,11 +216,17 @@ struct uart_port {
 #error Change mask not equivalent to userspace-visible bit defines
 #endif
 
-        /* status must be updated while holding port lock */
+        /*
+         * Must hold termios_rwsem, port mutex and port lock to change;
+         * can hold any one lock to read.
+         */
         upstat_t                status;
 
 #define UPSTAT_CTS_ENABLE       ((__force upstat_t) (1 << 0))
 #define UPSTAT_DCD_ENABLE       ((__force upstat_t) (1 << 1))
+#define UPSTAT_AUTORTS          ((__force upstat_t) (1 << 2))
+#define UPSTAT_AUTOCTS          ((__force upstat_t) (1 << 3))
+#define UPSTAT_AUTOXOFF         ((__force upstat_t) (1 << 4))
 
         int                     hw_stopped;             /* sw-assisted CTS flow state */
         unsigned int            mctrl;                  /* current modem ctrl settings */
@@ -391,6 +400,13 @@ static inline bool uart_cts_enabled(struct uart_port *uport)
         return !!(uport->status & UPSTAT_CTS_ENABLE);
 }
 
+static inline bool uart_softcts_mode(struct uart_port *uport)
+{
+        upstat_t mask = UPSTAT_CTS_ENABLE | UPSTAT_AUTOCTS;
+
+        return ((uport->status & mask) == UPSTAT_CTS_ENABLE);
+}
+
 /*
  * The following are helper functions for the low level drivers.
  */
diff --git a/include/linux/serial_s3c.h b/include/linux/serial_s3c.h
index e6fc9567690b..a7f004a3c177 100644
--- a/include/linux/serial_s3c.h
+++ b/include/linux/serial_s3c.h
@@ -104,6 +104,31 @@
                                    S3C2410_UCON_RXIRQMODE | \
                                    S3C2410_UCON_RXFIFO_TOI)
 
+#define S3C64XX_UCON_TXBURST_1          (0<<20)
+#define S3C64XX_UCON_TXBURST_4          (1<<20)
+#define S3C64XX_UCON_TXBURST_8          (2<<20)
+#define S3C64XX_UCON_TXBURST_16         (3<<20)
+#define S3C64XX_UCON_TXBURST_MASK       (0xf<<20)
+#define S3C64XX_UCON_RXBURST_1          (0<<16)
+#define S3C64XX_UCON_RXBURST_4          (1<<16)
+#define S3C64XX_UCON_RXBURST_8          (2<<16)
+#define S3C64XX_UCON_RXBURST_16         (3<<16)
+#define S3C64XX_UCON_RXBURST_MASK       (0xf<<16)
+#define S3C64XX_UCON_TIMEOUT_SHIFT      (12)
+#define S3C64XX_UCON_TIMEOUT_MASK       (0xf<<12)
+#define S3C64XX_UCON_EMPTYINT_EN        (1<<11)
+#define S3C64XX_UCON_DMASUS_EN          (1<<10)
+#define S3C64XX_UCON_TXINT_LEVEL        (1<<9)
+#define S3C64XX_UCON_RXINT_LEVEL        (1<<8)
+#define S3C64XX_UCON_TIMEOUT_EN         (1<<7)
+#define S3C64XX_UCON_ERRINT_EN          (1<<6)
+#define S3C64XX_UCON_TXMODE_DMA         (2<<2)
+#define S3C64XX_UCON_TXMODE_CPU         (1<<2)
+#define S3C64XX_UCON_TXMODE_MASK        (3<<2)
+#define S3C64XX_UCON_RXMODE_DMA         (2<<0)
+#define S3C64XX_UCON_RXMODE_CPU         (1<<0)
+#define S3C64XX_UCON_RXMODE_MASK        (3<<0)
+
 #define S3C2410_UFCON_FIFOMODE    (1<<0)
 #define S3C2410_UFCON_TXTRIG0     (0<<6)
 #define S3C2410_UFCON_RXTRIG8     (1<<4)
@@ -155,6 +180,7 @@
 #define S3C2440_UFSTAT_TXMASK     (63<<8)
 #define S3C2440_UFSTAT_RXMASK     (63)
 
+#define S3C2410_UTRSTAT_TIMEOUT   (1<<3)
 #define S3C2410_UTRSTAT_TXE       (1<<2)
 #define S3C2410_UTRSTAT_TXFE      (1<<1)
 #define S3C2410_UTRSTAT_RXDR      (1<<0)
@@ -179,8 +205,10 @@
 #define S3C64XX_UINTM           0x38
 
 #define S3C64XX_UINTM_RXD       (0)
+#define S3C64XX_UINTM_ERROR     (1)
 #define S3C64XX_UINTM_TXD       (2)
 #define S3C64XX_UINTM_RXD_MSK   (1 << S3C64XX_UINTM_RXD)
+#define S3C64XX_UINTM_ERR_MSK   (1 << S3C64XX_UINTM_ERROR)
 #define S3C64XX_UINTM_TXD_MSK   (1 << S3C64XX_UINTM_TXD)
 
 /* Following are specific to S5PV210 */
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 7d66ae508e5c..358a337af598 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -14,6 +14,29 @@
 #include <linux/llist.h>
 
 
+/*
+ * Lock subclasses for tty locks
+ *
+ * TTY_LOCK_NORMAL is for normal ttys and master ptys.
+ * TTY_LOCK_SLAVE is for slave ptys only.
+ *
+ * Lock subclasses are necessary for handling nested locking with pty pairs.
+ * tty locks which use nested locking:
+ *
+ * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
+ *                The stable lock order is master pty first, then slave pty.
+ * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
+ *                 Subclassing this lock enables the slave pty to hold its
+ *                 termios_rwsem when claiming the master tty_buffer lock.
+ * tty_buffer lock - slave ptys can claim nested buffer lock when handling
+ *                   signal chars. The stable lock order is slave pty, then
+ *                   master.
+ */
+
+enum {
+        TTY_LOCK_NORMAL = 0,
+        TTY_LOCK_SLAVE,
+};
 
 /*
  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
@@ -443,6 +466,7 @@ extern void tty_flush_to_ldisc(struct tty_struct *tty);
 extern void tty_buffer_free_all(struct tty_port *port);
 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
 extern void tty_buffer_init(struct tty_port *port);
+extern void tty_buffer_set_lock_subclass(struct tty_port *port);
 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
@@ -467,7 +491,6 @@ static inline speed_t tty_get_baud_rate(struct tty_struct *tty)
 
 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
-extern int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
 
 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 extern void tty_ldisc_deref(struct tty_ldisc *);
diff --git a/include/linux/vt_buffer.h b/include/linux/vt_buffer.h
index 057db7d2f448..f38c10ba3ff5 100644
--- a/include/linux/vt_buffer.h
+++ b/include/linux/vt_buffer.h
@@ -21,10 +21,6 @@
 #ifndef VT_BUF_HAVE_RW
 #define scr_writew(val, addr) (*(addr) = (val))
 #define scr_readw(addr) (*(addr))
-#define scr_memcpyw(d, s, c) memcpy(d, s, c)
-#define scr_memmovew(d, s, c) memmove(d, s, c)
-#define VT_BUF_HAVE_MEMCPYW
-#define VT_BUF_HAVE_MEMMOVEW
 #endif
 
 #ifndef VT_BUF_HAVE_MEMSETW
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index c17218094f18..b2122813f18a 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -55,7 +55,8 @@
 #define PORT_ALTR_16550_F64 27  /* Altera 16550 UART with 64 FIFOs */
 #define PORT_ALTR_16550_F128 28 /* Altera 16550 UART with 128 FIFOs */
 #define PORT_RT2880     29      /* Ralink RT2880 internal UART */
-#define PORT_MAX_8250   29      /* max port ID */
+#define PORT_16550A_FSL64 30    /* Freescale 16550 UART with 64 FIFOs */
+#define PORT_MAX_8250   30      /* max port ID */
 
 /*
  * ARM specific type numbers.  These are not currently guaranteed
@@ -248,4 +249,13 @@
 /* MESON */
 #define PORT_MESON      109
 
+/* Conexant Digicolor */
+#define PORT_DIGICOLOR  110
+
+/* SPRD SERIAL  */
+#define PORT_SPRD       111
+
+/* Cris v10 / v32 SoC */
+#define PORT_CRIS       112
+
 #endif /* _UAPILINUX_SERIAL_CORE_H */
diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
index 53af3b790129..00adb01fa5f3 100644
--- a/include/uapi/linux/serial_reg.h
+++ b/include/uapi/linux/serial_reg.h
@@ -86,7 +86,8 @@
 #define UART_FCR6_T_TRIGGER_8   0x10 /* Mask for transmit trigger set at 8 */
 #define UART_FCR6_T_TRIGGER_24  0x20 /* Mask for transmit trigger set at 24 */
 #define UART_FCR6_T_TRIGGER_30  0x30 /* Mask for transmit trigger set at 30 */
-#define UART_FCR7_64BYTE        0x20 /* Go into 64 byte mode (TI16C750) */
+#define UART_FCR7_64BYTE        0x20 /* Go into 64 byte mode (TI16C750 and
+                                        some Freescale UARTs) */
 
 #define UART_FCR_R_TRIG_SHIFT           6
 #define UART_FCR_R_TRIG_BITS(x)         \