Merge tag 'tty-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull TTY updates from Greg Kroah-Hartman:
 "Here's the big TTY/serial driver pull request for the 3.5-rc1 merge
  window.

  Nothing major in here, just lots of incremental changes from Alan and
  Jiri reworking some tty core things to behave better and to get a more
  solid grasp on some of the nasty tty locking issues.

  There are a few tty and serial driver updates in here as well.

  All of this has been in the linux-next releases for a while with no
  problems.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

* tag 'tty-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (115 commits)
  serial: bfin_uart: Make MMR access compatible with 32 bits bf609 style controller.
  serial: bfin_uart: RTS and CTS MMRs can be either 16-bit width or 32-bit width.
  serial: bfin_uart: narrow the reboot condition in DMA tx interrupt
  serial: bfin_uart: Adapt bf5xx serial driver to bf60x serial4 controller.
  Revert "serial_core: Update buffer overrun statistics."
  tty: hvc_xen: NULL dereference on allocation failure
  tty: Fix LED error return
  tty: Allow uart_register/unregister/register
  tty: move global ldisc idle waitqueue to the individual ldisc
  serial8250-em: Add DT support
  serial8250-em: clk_get() IS_ERR() error handling fix
  serial_core: Update buffer overrun statistics.
  tty: drop the pty lock during hangup
  cris: fix missing tty arg in wait_event_interruptible_tty call
  tty/amiserial: Add missing argument for tty_unlock()
  tty_lock: Localise the lock
  pty: Lock the devpts bits privately
  tty_lock: undo the old tty_lock use on the ctty
  serial8250-em: Emma Mobile UART driver V2
  Add missing call to uart_update_timeout()
  ...

16 files changed, 759 insertions, 771 deletions

diff --git a/drivers/tty/serial/68328serial.c b/drivers/tty/serial/68328serial.c
index 5ce782529d6..3ed20e435e5 100644
--- a/drivers/tty/serial/68328serial.c
+++ b/drivers/tty/serial/68328serial.c
@@ -17,6 +17,7 @@
 #include <asm/dbg.h>
 #include <linux/module.h>
 #include <linux/errno.h>
+#include <linux/serial.h>
 #include <linux/signal.h>
 #include <linux/sched.h>
 #include <linux/timer.h>
@@ -56,8 +57,6 @@
 #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
@@ -65,33 +64,82 @@
 #define USE_INTS
 #endif
 
-static struct m68k_serial m68k_soft[NR_PORTS];
+/*
+ * 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)
 
-static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
+/*
+ * 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
+ */
 
-/* multiple ports are contiguous in memory */
-m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
+/* (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) */
 
-struct tty_struct m68k_ttys;
-struct m68k_serial *m68k_consinfo = 0;
+/*
+ * This is our internal structure for each serial port's state.
+ */
+struct m68k_serial {
+	struct tty_port		tport;
+	char			is_cons;	/* Is this our console. */
+	int			magic;
+	int			baud_base;
+	int			port;
+	int			irq;
+	int			type;		/* UART type */
+	int			custom_divisor;
+	int			x_char;		/* xon/xoff character */
+	int			line;
+	unsigned char		*xmit_buf;
+	int			xmit_head;
+	int			xmit_tail;
+	int			xmit_cnt;
+};
 
-#define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
+#define SERIAL_MAGIC 0x5301
 
-struct tty_driver *serial_driver;
+/*
+ * Define the number of ports supported and their irqs.
+ */
+#define NR_PORTS 1
 
-/* number of characters left in xmit buffer before we ask for more */
-#define WAKEUP_CHARS 256
+static struct m68k_serial m68k_soft[NR_PORTS];
 
-/* 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
+static unsigned int uart_irqs[NR_PORTS] = { UART_IRQ_NUM };
 
-#define RS_ISR_PASS_LIMIT 256
+/* multiple ports are contiguous in memory */
+m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
+
+struct tty_driver *serial_driver;
 
-static void change_speed(struct m68k_serial *info);
+static void change_speed(struct m68k_serial *info, struct tty_struct *tty);
 
 /*
  *	Setup for console. Argument comes from the boot command line.
@@ -143,17 +191,6 @@ 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)
 {
@@ -189,7 +226,8 @@ static void rs_stop(struct tty_struct *tty)
 
 static int rs_put_char(char ch)
 {
-        int flags, loops = 0;
+	unsigned long flags;
+	int loops = 0;
 
         local_irq_save(flags);
 
@@ -224,28 +262,9 @@ static void rs_start(struct tty_struct *tty)
 	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)
+static void receive_chars(struct m68k_serial *info, struct tty_struct *tty,
+		unsigned short rx)
 {
-	/* 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;
 
@@ -259,7 +278,6 @@ static void receive_chars(struct m68k_serial *info, unsigned short rx)
 	
 		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 */
@@ -280,16 +298,13 @@ static void receive_chars(struct m68k_serial *info, unsigned short rx)
 		
 		flag = TTY_NORMAL;
 
-		if(rx & URX_PARITY_ERROR) {
+		if (rx & URX_PARITY_ERROR)
 			flag = TTY_PARITY;
-			status_handle(info, rx);
-		} else if(rx & URX_OVRUN) {
+		else if (rx & URX_OVRUN)
 			flag = TTY_OVERRUN;
-			status_handle(info, rx);
-		} else if(rx & URX_FRAME_ERROR) {
+		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);
@@ -301,7 +316,7 @@ clear_and_exit:
 	return;
 }
 
-static void transmit_chars(struct m68k_serial *info)
+static void transmit_chars(struct m68k_serial *info, struct tty_struct *tty)
 {
 	m68328_uart *uart = &uart_addr[info->line];
 
@@ -312,7 +327,7 @@ static void transmit_chars(struct m68k_serial *info)
 		goto clear_and_return;
 	}
 
-	if((info->xmit_cnt <= 0) || info->tty->stopped) {
+	if ((info->xmit_cnt <= 0) || !tty || tty->stopped) {
 		/* That's peculiar... TX ints off */
 		uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 		goto clear_and_return;
@@ -340,6 +355,7 @@ clear_and_return:
 irqreturn_t rs_interrupt(int irq, void *dev_id)
 {
 	struct m68k_serial *info = dev_id;
+	struct tty_struct *tty = tty_port_tty_get(&info->tport);
 	m68328_uart *uart;
 	unsigned short rx;
 	unsigned short tx;
@@ -350,20 +366,24 @@ irqreturn_t rs_interrupt(int irq, void *dev_id)
 #ifdef USE_INTS
 	tx = uart->utx.w;
 
-	if (rx & URX_DATA_READY) receive_chars(info, rx);
-	if (tx & UTX_TX_AVAIL)   transmit_chars(info);
+	if (rx & URX_DATA_READY)
+		receive_chars(info, tty, rx);
+	if (tx & UTX_TX_AVAIL)
+		transmit_chars(info, tty);
 #else
-	receive_chars(info, rx);		
+	receive_chars(info, tty, rx);
 #endif
+	tty_kref_put(tty);
+
 	return IRQ_HANDLED;
 }
 
-static int startup(struct m68k_serial * info)
+static int startup(struct m68k_serial *info, struct tty_struct *tty)
 {
 	m68328_uart *uart = &uart_addr[info->line];
 	unsigned long flags;
 	
-	if (info->flags & S_INITIALIZED)
+	if (info->tport.flags & ASYNC_INITIALIZED)
 		return 0;
 
 	if (!info->xmit_buf) {
@@ -380,7 +400,6 @@ static int startup(struct m68k_serial * info)
 	 */
 
 	uart->ustcnt = USTCNT_UEN;
-	info->xmit_fifo_size = 1;
 	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 	(void)uart->urx.w;
 
@@ -394,17 +413,17 @@ static int startup(struct m68k_serial * info)
 	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 #endif
 
-	if (info->tty)
-		clear_bit(TTY_IO_ERROR, &info->tty->flags);
+	if (tty)
+		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
 	 */
 
-	change_speed(info);
+	change_speed(info, tty);
 
-	info->flags |= S_INITIALIZED;
+	info->tport.flags |= ASYNC_INITIALIZED;
 	local_irq_restore(flags);
 	return 0;
 }
@@ -413,13 +432,13 @@ static int startup(struct m68k_serial * info)
  * 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)
+static void shutdown(struct m68k_serial *info, struct tty_struct *tty)
 {
 	m68328_uart *uart = &uart_addr[info->line];
 	unsigned long	flags;
 
 	uart->ustcnt = 0; /* All off! */
-	if (!(info->flags & S_INITIALIZED))
+	if (!(info->tport.flags & ASYNC_INITIALIZED))
 		return;
 
 	local_irq_save(flags);
@@ -429,10 +448,10 @@ static void shutdown(struct m68k_serial * info)
 		info->xmit_buf = 0;
 	}
 
-	if (info->tty)
-		set_bit(TTY_IO_ERROR, &info->tty->flags);
+	if (tty)
+		set_bit(TTY_IO_ERROR, &tty->flags);
 	
-	info->flags &= ~S_INITIALIZED;
+	info->tport.flags &= ~ASYNC_INITIALIZED;
 	local_irq_restore(flags);
 }
 
@@ -488,7 +507,7 @@ struct {
  * 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)
+static void change_speed(struct m68k_serial *info, struct tty_struct *tty)
 {
 	m68328_uart *uart = &uart_addr[info->line];
 	unsigned short port;
@@ -496,9 +515,7 @@ static void change_speed(struct m68k_serial *info)
 	unsigned cflag;
 	int	i;
 
-	if (!info->tty || !info->tty->termios)
-		return;
-	cflag = info->tty->termios->c_cflag;
+	cflag = tty->termios->c_cflag;
 	if (!(port = info->port))
 		return;
 
@@ -510,7 +527,6 @@ static void change_speed(struct m68k_serial *info)
                 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);
 
@@ -807,10 +823,10 @@ static int get_serial_info(struct m68k_serial * info,
 	tmp.line = info->line;
 	tmp.port = info->port;
 	tmp.irq = info->irq;
-	tmp.flags = info->flags;
+	tmp.flags = info->tport.flags;
 	tmp.baud_base = info->baud_base;
-	tmp.close_delay = info->close_delay;
-	tmp.closing_wait = info->closing_wait;
+	tmp.close_delay = info->tport.close_delay;
+	tmp.closing_wait = info->tport.closing_wait;
 	tmp.custom_divisor = info->custom_divisor;
 	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 		return -EFAULT;
@@ -818,9 +834,10 @@ static int get_serial_info(struct m68k_serial * info,
 	return 0;
 }
 
-static int set_serial_info(struct m68k_serial * info,
+static int set_serial_info(struct m68k_serial *info, struct tty_struct *tty,
 			   struct serial_struct * new_info)
 {
+	struct tty_port *port = &info->tport;
 	struct serial_struct new_serial;
 	struct m68k_serial old_info;
 	int 			retval = 0;
@@ -834,17 +851,17 @@ static int set_serial_info(struct m68k_serial * 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)))
+		    (new_serial.close_delay != port->close_delay) ||
+		    ((new_serial.flags & ~ASYNC_USR_MASK) !=
+		     (port->flags & ~ASYNC_USR_MASK)))
 			return -EPERM;
-		info->flags = ((info->flags & ~S_USR_MASK) |
-			       (new_serial.flags & S_USR_MASK));
+		port->flags = ((port->flags & ~ASYNC_USR_MASK) |
+			       (new_serial.flags & ASYNC_USR_MASK));
 		info->custom_divisor = new_serial.custom_divisor;
 		goto check_and_exit;
 	}
 
-	if (info->count > 1)
+	if (port->count > 1)
 		return -EBUSY;
 
 	/*
@@ -853,14 +870,14 @@ static int set_serial_info(struct m68k_serial * info,
 	 */
 
 	info->baud_base = new_serial.baud_base;
-	info->flags = ((info->flags & ~S_FLAGS) |
-			(new_serial.flags & S_FLAGS));
+	port->flags = ((port->flags & ~ASYNC_FLAGS) |
+			(new_serial.flags & ASYNC_FLAGS));
 	info->type = new_serial.type;
-	info->close_delay = new_serial.close_delay;
-	info->closing_wait = new_serial.closing_wait;
+	port->close_delay = new_serial.close_delay;
+	port->closing_wait = new_serial.closing_wait;
 
 check_and_exit:
-	retval = startup(info);
+	retval = startup(info, tty);
 	return retval;
 }
 
@@ -946,7 +963,7 @@ static int rs_ioctl(struct tty_struct *tty,
 			return get_serial_info(info,
 				       (struct serial_struct *) arg);
 		case TIOCSSERIAL:
-			return set_serial_info(info,
+			return set_serial_info(info, tty,
 					       (struct serial_struct *) arg);
 		case TIOCSERGETLSR: /* Get line status register */
 			return get_lsr_info(info, (unsigned int *) arg);
@@ -965,7 +982,7 @@ 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);
+	change_speed(info, tty);
 
 	if ((old_termios->c_cflag & CRTSCTS) &&
 	    !(tty->termios->c_cflag & CRTSCTS)) {
@@ -988,6 +1005,7 @@ static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 static void rs_close(struct tty_struct *tty, struct file * filp)
 {
 	struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
+	struct tty_port *port = &info->tport;
 	m68328_uart *uart = &uart_addr[info->line];
 	unsigned long flags;
 
@@ -1001,7 +1019,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
 		return;
 	}
 	
-	if ((tty->count == 1) && (info->count != 1)) {
+	if ((tty->count == 1) && (port->count != 1)) {
 		/*
 		 * Uh, oh.  tty->count is 1, which means that the tty
 		 * structure will be freed.  Info->count should always
@@ -1010,26 +1028,26 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
 		 * 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;
+		       "port->count is %d\n", port->count);
+		port->count = 1;
 	}
-	if (--info->count < 0) {
+	if (--port->count < 0) {
 		printk("rs_close: bad serial port count for ttyS%d: %d\n",
-		       info->line, info->count);
-		info->count = 0;
+		       info->line, port->count);
+		port->count = 0;
 	}
-	if (info->count) {
+	if (port->count) {
 		local_irq_restore(flags);
 		return;
 	}
-	info->flags |= S_CLOSING;
+	port->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 != S_CLOSING_WAIT_NONE)
-		tty_wait_until_sent(tty, info->closing_wait);
+	if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+		tty_wait_until_sent(tty, port->closing_wait);
 	/*
 	 * At this point we stop accepting input.  To do this, we
 	 * disable the receive line status interrupts, and tell the
@@ -1040,13 +1058,12 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
 	uart->ustcnt &= ~USTCNT_RXEN;
 	uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
 
-	shutdown(info);
+	shutdown(info, tty);
 	rs_flush_buffer(tty);
 		
 	tty_ldisc_flush(tty);
 	tty->closing = 0;
-	info->event = 0;
-	info->tty = NULL;
+	tty_port_tty_set(&info->tport, NULL);
 #warning "This is not and has never been valid so fix it"	
 #if 0
 	if (tty->ldisc.num != ldiscs[N_TTY].num) {
@@ -1058,14 +1075,13 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
 			(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);
+	if (port->blocked_open) {
+		if (port->close_delay)
+			msleep_interruptible(jiffies_to_msecs(port->close_delay));
+		wake_up_interruptible(&port->open_wait);
 	}
-	info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
-	wake_up_interruptible(&info->close_wait);
+	port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
+	wake_up_interruptible(&port->close_wait);
 	local_irq_restore(flags);
 }
 
@@ -1080,107 +1096,14 @@ void rs_hangup(struct tty_struct *tty)
 		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);
+	shutdown(info, tty);
+	info->tport.count = 0;
+	info->tport.flags &= ~ASYNC_NORMAL_ACTIVE;
+	tty_port_tty_set(&info->tport, NULL);
+	wake_up_interruptible(&info->tport.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
@@ -1196,18 +1119,18 @@ int rs_open(struct tty_struct *tty, struct file * filp)
 	if (serial_paranoia_check(info, tty->name, "rs_open"))
 		return -ENODEV;
 
-	info->count++;
+	info->tport.count++;
 	tty->driver_data = info;
-	info->tty = tty;
+	tty_port_tty_set(&info->tport, tty);
 
 	/*
 	 * Start up serial port
 	 */
-	retval = startup(info);
+	retval = startup(info, tty);
 	if (retval)
 		return retval;
 
-	return block_til_ready(tty, filp, info);
+	return tty_port_block_til_ready(&info->tport, tty, filp);
 }
 
 /* Finally, routines used to initialize the serial driver. */
@@ -1235,11 +1158,15 @@ static const struct tty_operations rs_ops = {
 	.set_ldisc = rs_set_ldisc,
 };
 
+static const struct tty_port_operations rs_port_ops = {
+};
+
 /* rs_init inits the driver */
 static int __init
 rs68328_init(void)
 {
-	int flags, i;
+	unsigned long flags;
+	int i;
 	struct m68k_serial *info;
 
 	serial_driver = alloc_tty_driver(NR_PORTS);
@@ -1273,19 +1200,13 @@ rs68328_init(void)
 	for(i=0;i<NR_PORTS;i++) {
 
 	    info = &m68k_soft[i];
+	    tty_port_init(&info->tport);
+	    info->tport.ops = &rs_port_ops;
 	    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_waitqueue_head(&info->open_wait);
-	    init_waitqueue_head(&info->close_wait);
 	    info->line = i;
 	    info->is_cons = 1; /* Means shortcuts work */
 	    
diff --git a/drivers/tty/serial/68328serial.h b/drivers/tty/serial/68328serial.h
deleted file mode 100644
index 3d2faabd766..00000000000
--- a/drivers/tty/serial/68328serial.h
+++ /dev/null
@@ -1,186 +0,0 @@
-/* 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;
-	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/8250/8250.c b/drivers/tty/serial/8250/8250.c
index 5c27f7e6c9f..47d061b9ad4 100644
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -284,7 +284,20 @@ static const struct serial8250_config uart_config[] = {
 	},
 };
 
-#if defined(CONFIG_MIPS_ALCHEMY)
+/* Uart divisor latch read */
+static int default_serial_dl_read(struct uart_8250_port *up)
+{
+	return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8;
+}
+
+/* Uart divisor latch write */
+static void default_serial_dl_write(struct uart_8250_port *up, int value)
+{
+	serial_out(up, UART_DLL, value & 0xff);
+	serial_out(up, UART_DLM, value >> 8 & 0xff);
+}
+
+#ifdef CONFIG_MIPS_ALCHEMY
 
 /* Au1x00 UART hardware has a weird register layout */
 static const u8 au_io_in_map[] = {
@@ -305,22 +318,32 @@ static const u8 au_io_out_map[] = {
 	[UART_MCR] = 6,
 };
 
-/* sane hardware needs no mapping */
-static inline int map_8250_in_reg(struct uart_port *p, int offset)
+static unsigned int au_serial_in(struct uart_port *p, int offset)
+{
+	offset = au_io_in_map[offset] << p->regshift;
+	return __raw_readl(p->membase + offset);
+}
+
+static void au_serial_out(struct uart_port *p, int offset, int value)
+{
+	offset = au_io_out_map[offset] << p->regshift;
+	__raw_writel(value, p->membase + offset);
+}
+
+/* Au1x00 haven't got a standard divisor latch */
+static int au_serial_dl_read(struct uart_8250_port *up)
 {
-	if (p->iotype != UPIO_AU)
-		return offset;
-	return au_io_in_map[offset];
+	return __raw_readl(up->port.membase + 0x28);
 }
 
-static inline int map_8250_out_reg(struct uart_port *p, int offset)
+static void au_serial_dl_write(struct uart_8250_port *up, int value)
 {
-	if (p->iotype != UPIO_AU)
-		return offset;
-	return au_io_out_map[offset];
+	__raw_writel(value, up->port.membase + 0x28);
 }
 
-#elif defined(CONFIG_SERIAL_8250_RM9K)
+#endif
+
+#ifdef CONFIG_SERIAL_8250_RM9K
 
 static const u8
 	regmap_in[8] = {
@@ -344,87 +367,79 @@ static const u8
 		[UART_SCR]	= 0x2c
 	};
 
-static inline int map_8250_in_reg(struct uart_port *p, int offset)
+static unsigned int rm9k_serial_in(struct uart_port *p, int offset)
 {
-	if (p->iotype != UPIO_RM9000)
-		return offset;
-	return regmap_in[offset];
+	offset = regmap_in[offset] << p->regshift;
+	return readl(p->membase + offset);
 }
 
-static inline int map_8250_out_reg(struct uart_port *p, int offset)
+static void rm9k_serial_out(struct uart_port *p, int offset, int value)
 {
-	if (p->iotype != UPIO_RM9000)
-		return offset;
-	return regmap_out[offset];
+	offset = regmap_out[offset] << p->regshift;
+	writel(value, p->membase + offset);
 }
 
-#else
+static int rm9k_serial_dl_read(struct uart_8250_port *up)
+{
+	return ((__raw_readl(up->port.membase + 0x10) << 8) |
+		(__raw_readl(up->port.membase + 0x08) & 0xff)) & 0xffff;
+}
 
-/* sane hardware needs no mapping */
-#define map_8250_in_reg(up, offset) (offset)
-#define map_8250_out_reg(up, offset) (offset)
+static void rm9k_serial_dl_write(struct uart_8250_port *up, int value)
+{
+	__raw_writel(value, up->port.membase + 0x08);
+	__raw_writel(value >> 8, up->port.membase + 0x10);
+}
 
 #endif
 
 static unsigned int hub6_serial_in(struct uart_port *p, int offset)
 {
-	offset = map_8250_in_reg(p, offset) << p->regshift;
+	offset = 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;
+	offset = 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;
+	offset = 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;
+	offset = 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;
+	offset = 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;
+	offset = 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 io_serial_in(struct uart_port *p, int offset)
 {
-	offset = map_8250_in_reg(p, offset) << p->regshift;
+	offset = 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;
+	offset = offset << p->regshift;
 	outb(value, p->iobase + offset);
 }
 
@@ -434,6 +449,10 @@ static void set_io_from_upio(struct uart_port *p)
 {
 	struct uart_8250_port *up =
 		container_of(p, struct uart_8250_port, port);
+
+	up->dl_read = default_serial_dl_read;
+	up->dl_write = default_serial_dl_write;
+
 	switch (p->iotype) {
 	case UPIO_HUB6:
 		p->serial_in = hub6_serial_in;
@@ -445,16 +464,28 @@ static void set_io_from_upio(struct uart_port *p)
 		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;
 
+#ifdef CONFIG_SERIAL_8250_RM9K
+	case UPIO_RM9000:
+		p->serial_in = rm9k_serial_in;
+		p->serial_out = rm9k_serial_out;
+		up->dl_read = rm9k_serial_dl_read;
+		up->dl_write = rm9k_serial_dl_write;
+		break;
+#endif
+
+#ifdef CONFIG_MIPS_ALCHEMY
 	case UPIO_AU:
 		p->serial_in = au_serial_in;
 		p->serial_out = au_serial_out;
+		up->dl_read = au_serial_dl_read;
+		up->dl_write = au_serial_dl_write;
 		break;
+#endif
 
 	default:
 		p->serial_in = io_serial_in;
@@ -481,59 +512,6 @@ serial_port_out_sync(struct uart_port *p, int offset, int value)
 	}
 }
 
-/* Uart divisor latch read */
-static inline int _serial_dl_read(struct uart_8250_port *up)
-{
-	return serial_in(up, UART_DLL) | serial_in(up, UART_DLM) << 8;
-}
-
-/* Uart divisor latch write */
-static inline void _serial_dl_write(struct uart_8250_port *up, int value)
-{
-	serial_out(up, UART_DLL, value & 0xff);
-	serial_out(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
  */
@@ -568,6 +546,16 @@ static void serial8250_clear_fifos(struct uart_8250_port *p)
 	}
 }
 
+void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p)
+{
+	unsigned char fcr;
+
+	serial8250_clear_fifos(p);
+	fcr = uart_config[p->port.type].fcr;
+	serial_out(p, UART_FCR, fcr);
+}
+EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos);
+
 /*
  * IER sleep support.  UARTs which have EFRs need the "extended
  * capability" bit enabled.  Note that on XR16C850s, we need to
@@ -1332,27 +1320,6 @@ static void serial8250_enable_ms(struct uart_port *port)
 }
 
 /*
- * 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);
-}
-
-/*
  * serial8250_rx_chars: processes according to the passed in LSR
  * value, and returns the remaining LSR bits not handled
  * by this Rx routine.
@@ -1386,20 +1353,10 @@ serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr)
 		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);
 				port->icount.brk++;
 				/*
-				 * If tegra port then clear the rx fifo to
-				 * accept another break/character.
-				 */
-				if (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
@@ -2280,10 +2237,11 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 		quot++;
 
 	if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
-		if (baud < 2400)
-			fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
-		else
-			fcr = uart_config[port->type].fcr;
+		fcr = uart_config[port->type].fcr;
+		if (baud < 2400) {
+			fcr &= ~UART_FCR_TRIGGER_MASK;
+			fcr |= UART_FCR_TRIGGER_1;
+		}
 	}
 
 	/*
@@ -3037,6 +2995,7 @@ static int __devinit serial8250_probe(struct platform_device *dev)
 		port.serial_in		= p->serial_in;
 		port.serial_out		= p->serial_out;
 		port.handle_irq		= p->handle_irq;
+		port.handle_break	= p->handle_break;
 		port.set_termios	= p->set_termios;
 		port.pm			= p->pm;
 		port.dev		= &dev->dev;
@@ -3153,7 +3112,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
 }
 
 /**
- *	serial8250_register_port - register a serial port
+ *	serial8250_register_8250_port - register a serial port
  *	@port: serial port template
  *
  *	Configure the serial port specified by the request. If the
@@ -3165,50 +3124,56 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
  *
  *	On success the port is ready to use and the line number is returned.
  */
-int serial8250_register_port(struct uart_port *port)
+int serial8250_register_8250_port(struct uart_8250_port *up)
 {
 	struct uart_8250_port *uart;
 	int ret = -ENOSPC;
 
-	if (port->uartclk == 0)
+	if (up->port.uartclk == 0)
 		return -EINVAL;
 
 	mutex_lock(&serial_mutex);
 
-	uart = serial8250_find_match_or_unused(port);
+	uart = serial8250_find_match_or_unused(&up->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);
+		uart->port.iobase       = up->port.iobase;
+		uart->port.membase      = up->port.membase;
+		uart->port.irq          = up->port.irq;
+		uart->port.irqflags     = up->port.irqflags;
+		uart->port.uartclk      = up->port.uartclk;
+		uart->port.fifosize     = up->port.fifosize;
+		uart->port.regshift     = up->port.regshift;
+		uart->port.iotype       = up->port.iotype;
+		uart->port.flags        = up->port.flags | UPF_BOOT_AUTOCONF;
+		uart->port.mapbase      = up->port.mapbase;
+		uart->port.private_data = up->port.private_data;
+		if (up->port.dev)
+			uart->port.dev = up->port.dev;
+
+		if (up->port.flags & UPF_FIXED_TYPE)
+			serial8250_init_fixed_type_port(uart, up->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;
-		if (port->handle_irq)
-			uart->port.handle_irq = port->handle_irq;
+		if (up->port.serial_in)
+			uart->port.serial_in = up->port.serial_in;
+		if (up->port.serial_out)
+			uart->port.serial_out = up->port.serial_out;
+		if (up->port.handle_irq)
+			uart->port.handle_irq = up->port.handle_irq;
 		/*  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 (up->port.set_termios)
+			uart->port.set_termios = up->port.set_termios;
+		if (up->port.pm)
+			uart->port.pm = up->port.pm;
+		if (up->port.handle_break)
+			uart->port.handle_break = up->port.handle_break;
+		if (up->dl_read)
+			uart->dl_read = up->dl_read;
+		if (up->dl_write)
+			uart->dl_write = up->dl_write;
 
 		if (serial8250_isa_config != NULL)
 			serial8250_isa_config(0, &uart->port,
@@ -3222,6 +3187,29 @@ int serial8250_register_port(struct uart_port *port)
 
 	return ret;
 }
+EXPORT_SYMBOL(serial8250_register_8250_port);
+
+/**
+ *	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 up;
+
+	memset(&up, 0, sizeof(up));
+	memcpy(&up.port, port, sizeof(*port));
+	return serial8250_register_8250_port(&up);
+}
 EXPORT_SYMBOL(serial8250_register_port);
 
 /**
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index 2868a1da254..f9719d167c8 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -37,6 +37,10 @@ struct uart_8250_port {
 	unsigned char		lsr_saved_flags;
 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
 	unsigned char		msr_saved_flags;
+
+	/* 8250 specific callbacks */
+	int			(*dl_read)(struct uart_8250_port *);
+	void			(*dl_write)(struct uart_8250_port *, int);
 };
 
 struct old_serial_port {
@@ -96,6 +100,18 @@ static inline void serial_out(struct uart_8250_port *up, int offset, int value)
 	up->port.serial_out(&up->port, offset, value);
 }
 
+void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);
+
+static inline int serial_dl_read(struct uart_8250_port *up)
+{
+	return up->dl_read(up);
+}
+
+static inline void serial_dl_write(struct uart_8250_port *up, int value)
+{
+	up->dl_write(up, value);
+}
+
 #if defined(__alpha__) && !defined(CONFIG_PCI)
 /*
  * Digital did something really horribly wrong with the OUT1 and OUT2
diff --git a/drivers/tty/serial/8250/8250_em.c b/drivers/tty/serial/8250/8250_em.c
new file mode 100644
index 00000000000..3a0363e7f3a
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_em.c
@@ -0,0 +1,186 @@
+/*
+ * Renesas Emma Mobile 8250 driver
+ *
+ *  Copyright (C) 2012 Magnus Damm
+ *
+ * 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
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+
+#include "8250.h"
+
+#define UART_DLL_EM 9
+#define UART_DLM_EM 10
+
+struct serial8250_em_priv {
+	struct clk *sclk;
+	int line;
+};
+
+static void serial8250_em_serial_out(struct uart_port *p, int offset, int value)
+{
+	switch (offset) {
+	case UART_TX: /* TX @ 0x00 */
+		writeb(value, p->membase);
+		break;
+	case UART_FCR: /* FCR @ 0x0c (+1) */
+	case UART_LCR: /* LCR @ 0x10 (+1) */
+	case UART_MCR: /* MCR @ 0x14 (+1) */
+	case UART_SCR: /* SCR @ 0x20 (+1) */
+		writel(value, p->membase + ((offset + 1) << 2));
+		break;
+	case UART_IER: /* IER @ 0x04 */
+		value &= 0x0f; /* only 4 valid bits - not Xscale */
+		/* fall-through */
+	case UART_DLL_EM: /* DLL @ 0x24 (+9) */
+	case UART_DLM_EM: /* DLM @ 0x28 (+9) */
+		writel(value, p->membase + (offset << 2));
+	}
+}
+
+static unsigned int serial8250_em_serial_in(struct uart_port *p, int offset)
+{
+	switch (offset) {
+	case UART_RX: /* RX @ 0x00 */
+		return readb(p->membase);
+	case UART_MCR: /* MCR @ 0x14 (+1) */
+	case UART_LSR: /* LSR @ 0x18 (+1) */
+	case UART_MSR: /* MSR @ 0x1c (+1) */
+	case UART_SCR: /* SCR @ 0x20 (+1) */
+		return readl(p->membase + ((offset + 1) << 2));
+	case UART_IER: /* IER @ 0x04 */
+	case UART_IIR: /* IIR @ 0x08 */
+	case UART_DLL_EM: /* DLL @ 0x24 (+9) */
+	case UART_DLM_EM: /* DLM @ 0x28 (+9) */
+		return readl(p->membase + (offset << 2));
+	}
+	return 0;
+}
+
+static int serial8250_em_serial_dl_read(struct uart_8250_port *up)
+{
+	return serial_in(up, UART_DLL_EM) | serial_in(up, UART_DLM_EM) << 8;
+}
+
+static void serial8250_em_serial_dl_write(struct uart_8250_port *up, int value)
+{
+	serial_out(up, UART_DLL_EM, value & 0xff);
+	serial_out(up, UART_DLM_EM, value >> 8 & 0xff);
+}
+
+static int __devinit serial8250_em_probe(struct platform_device *pdev)
+{
+	struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	struct serial8250_em_priv *priv;
+	struct uart_8250_port up;
+	int ret = -EINVAL;
+
+	if (!regs || !irq) {
+		dev_err(&pdev->dev, "missing registers or irq\n");
+		goto err0;
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		dev_err(&pdev->dev, "unable to allocate private data\n");
+		ret = -ENOMEM;
+		goto err0;
+	}
+
+	priv->sclk = clk_get(&pdev->dev, "sclk");
+	if (IS_ERR(priv->sclk)) {
+		dev_err(&pdev->dev, "unable to get clock\n");
+		ret = PTR_ERR(priv->sclk);
+		goto err1;
+	}
+
+	memset(&up, 0, sizeof(up));
+	up.port.mapbase = regs->start;
+	up.port.irq = irq->start;
+	up.port.type = PORT_UNKNOWN;
+	up.port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT | UPF_IOREMAP;
+	up.port.dev = &pdev->dev;
+	up.port.private_data = priv;
+
+	clk_enable(priv->sclk);
+	up.port.uartclk = clk_get_rate(priv->sclk);
+
+	up.port.iotype = UPIO_MEM32;
+	up.port.serial_in = serial8250_em_serial_in;
+	up.port.serial_out = serial8250_em_serial_out;
+	up.dl_read = serial8250_em_serial_dl_read;
+	up.dl_write = serial8250_em_serial_dl_write;
+
+	ret = serial8250_register_8250_port(&up);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to register 8250 port\n");
+		goto err2;
+	}
+
+	priv->line = ret;
+	platform_set_drvdata(pdev, priv);
+	return 0;
+
+ err2:
+	clk_disable(priv->sclk);
+	clk_put(priv->sclk);
+ err1:
+	kfree(priv);
+ err0:
+	return ret;
+}
+
+static int __devexit serial8250_em_remove(struct platform_device *pdev)
+{
+	struct serial8250_em_priv *priv = platform_get_drvdata(pdev);
+
+	serial8250_unregister_port(priv->line);
+	clk_disable(priv->sclk);
+	clk_put(priv->sclk);
+	kfree(priv);
+	return 0;
+}
+
+static const struct of_device_id serial8250_em_dt_ids[] __devinitconst = {
+	{ .compatible = "renesas,em-uart", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, serial8250_em_dt_ids);
+
+static struct platform_driver serial8250_em_platform_driver = {
+	.driver = {
+		.name		= "serial8250-em",
+		.of_match_table = serial8250_em_dt_ids,
+		.owner		= THIS_MODULE,
+	},
+	.probe			= serial8250_em_probe,
+	.remove			= __devexit_p(serial8250_em_remove),
+};
+
+module_platform_driver(serial8250_em_platform_driver);
+
+MODULE_AUTHOR("Magnus Damm");
+MODULE_DESCRIPTION("Renesas Emma Mobile 8250 Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 858dca865d6..28e7c7cce89 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/tty.h>
+#include <linux/serial_reg.h>
 #include <linux/serial_core.h>
 #include <linux/8250_pci.h>
 #include <linux/bitops.h>
@@ -1092,11 +1093,49 @@ static int skip_tx_en_setup(struct serial_private *priv,
 	return pci_default_setup(priv, board, port, idx);
 }
 
+static void kt_handle_break(struct uart_port *p)
+{
+	struct uart_8250_port *up =
+		container_of(p, struct uart_8250_port, port);
+	/*
+	 * On receipt of a BI, serial device in Intel ME (Intel
+	 * management engine) needs to have its fifos cleared for sane
+	 * SOL (Serial Over Lan) output.
+	 */
+	serial8250_clear_and_reinit_fifos(up);
+}
+
+static unsigned int kt_serial_in(struct uart_port *p, int offset)
+{
+	struct uart_8250_port *up =
+		container_of(p, struct uart_8250_port, port);
+	unsigned int val;
+
+	/*
+	 * When the Intel ME (management engine) gets reset its serial
+	 * port registers could return 0 momentarily.  Functions like
+	 * serial8250_console_write, read and save the IER, perform
+	 * some operation and then restore it.  In order to avoid
+	 * setting IER register inadvertently to 0, if the value read
+	 * is 0, double check with ier value in uart_8250_port and use
+	 * that instead.  up->ier should be the same value as what is
+	 * currently configured.
+	 */
+	val = inb(p->iobase + offset);
+	if (offset == UART_IER) {
+		if (val == 0)
+			val = up->ier;
+	}
+	return val;
+}
+
 static int kt_serial_setup(struct serial_private *priv,
 			   const struct pciserial_board *board,
 			   struct uart_port *port, int idx)
 {
 	port->flags |= UPF_BUG_THRE;
+	port->serial_in = kt_serial_in;
+	port->handle_break = kt_handle_break;
 	return skip_tx_en_setup(priv, board, port, idx);
 }
 
@@ -1609,54 +1648,72 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
 	{
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8811,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8812,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8813,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8814,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x8027,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x8028,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x8029,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x800C,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x800D,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
 		.init		= pci_eg20t_init,
 		.setup		= pci_default_setup,
 	},
@@ -2775,6 +2832,12 @@ void pciserial_suspend_ports(struct serial_private *priv)
 	for (i = 0; i < priv->nr; i++)
 		if (priv->line[i] >= 0)
 			serial8250_suspend_port(priv->line[i]);
+
+	/*
+	 * Ensure that every init quirk is properly torn down
+	 */
+	if (priv->quirk->exit)
+		priv->quirk->exit(priv->dev);
 }
 EXPORT_SYMBOL_GPL(pciserial_suspend_ports);
 
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 591f8018e7d..8bc7ecbf6be 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -278,3 +278,11 @@ config SERIAL_8250_DW
 	help
 	  Selecting this option will enable handling of the extra features
 	  present in the Synopsys DesignWare APB UART.
+
+config SERIAL_8250_EM
+	tristate "Support for Emma Mobile intergrated serial port"
+	depends on SERIAL_8250 && ARM && HAVE_CLK
+	help
+	  Selecting this option will add support for the integrated serial
+	  port hardware found on the Emma Mobile line of processors.
+	  If unsure, say N.
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 867bba73890..3f35eacdf67 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_SERIAL_8250_HUB6)		+= 8250_hub6.o
 obj-$(CONFIG_SERIAL_8250_MCA)		+= 8250_mca.o
 obj-$(CONFIG_SERIAL_8250_FSL)		+= 8250_fsl.o
 obj-$(CONFIG_SERIAL_8250_DW)		+= 8250_dw.o
+obj-$(CONFIG_SERIAL_8250_EM)		+= 8250_em.o
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 062ef8c2b3c..4ad721fb840 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -68,30 +68,6 @@
 #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;
@@ -101,6 +77,7 @@ struct vendor_data {
 	bool			oversampling;
 	bool			interrupt_may_hang;   /* vendor-specific */
 	bool			dma_threshold;
+	bool			cts_event_workaround;
 };
 
 static struct vendor_data vendor_arm = {
@@ -110,6 +87,7 @@ static struct vendor_data vendor_arm = {
 	.lcrh_rx		= UART011_LCRH,
 	.oversampling		= false,
 	.dma_threshold		= false,
+	.cts_event_workaround	= false,
 };
 
 static struct vendor_data vendor_st = {
@@ -120,6 +98,7 @@ static struct vendor_data vendor_st = {
 	.oversampling		= true,
 	.interrupt_may_hang	= true,
 	.dma_threshold		= true,
+	.cts_event_workaround	= true,
 };
 
 static struct uart_amba_port *amba_ports[UART_NR];
@@ -1055,69 +1034,6 @@ static inline bool pl011_dma_rx_running(struct uart_amba_port *uap)
 #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;
@@ -1246,12 +1162,26 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
 	unsigned long flags;
 	unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
 	int handled = 0;
+	unsigned int dummy_read;
 
 	spin_lock_irqsave(&uap->port.lock, flags);
 
 	status = readw(uap->port.membase + UART011_MIS);
 	if (status) {
 		do {
+			if (uap->vendor->cts_event_workaround) {
+				/* workaround to make sure that all bits are unlocked.. */
+				writew(0x00, uap->port.membase + UART011_ICR);
+
+				/*
+				 * WA: introduce 26ns(1 uart clk) delay before W1C;
+				 * single apb access will incur 2 pclk(133.12Mhz) delay,
+				 * so add 2 dummy reads
+				 */
+				dummy_read = readw(uap->port.membase + UART011_ICR);
+				dummy_read = readw(uap->port.membase + UART011_ICR);
+			}
+
 			writew(status & ~(UART011_TXIS|UART011_RTIS|
 					  UART011_RXIS),
 			       uap->port.membase + UART011_ICR);
@@ -1268,11 +1198,8 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
 			if (status & UART011_TXIS)
 				pl011_tx_chars(uap);
 
-			if (pass_counter-- == 0) {
-				if (uap->interrupt_may_hang)
-					tasklet_schedule(&pl011_lockup_tlet);
+			if (pass_counter-- == 0)
 				break;
-			}
 
 			status = readw(uap->port.membase + UART011_MIS);
 		} while (status != 0);
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 5832fdef11e..bd97db23985 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -1,7 +1,7 @@
 /*
  * Blackfin On-Chip Serial Driver
  *
- * Copyright 2006-2010 Analog Devices Inc.
+ * Copyright 2006-2011 Analog Devices Inc.
  *
  * Enter bugs at http://blackfin.uclinux.org/
  *
@@ -35,10 +35,6 @@
 #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
@@ -166,7 +162,7 @@ static void bfin_serial_stop_tx(struct uart_port *port)
 	uart->tx_count = 0;
 	uart->tx_done = 1;
 #else
-#ifdef CONFIG_BF54x
+#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
 	/* Clear TFI bit */
 	UART_PUT_LSR(uart, TFI);
 #endif
@@ -337,7 +333,7 @@ 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
+#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
 		/* Clear TFI bit */
 		UART_PUT_LSR(uart, TFI);
 #endif
@@ -536,7 +532,7 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 		 */
 		UART_CLEAR_IER(uart, ETBEI);
 		uart->port.icount.tx += uart->tx_count;
-		if (!uart_circ_empty(xmit)) {
+		if (!(xmit->tail == 0 && xmit->head == 0)) {
 			xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
 
 			if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -553,7 +549,7 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
 static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 {
 	struct bfin_serial_port *uart = dev_id;
-	unsigned short irqstat;
+	unsigned int irqstat;
 	int x_pos, pos;
 
 	spin_lock(&uart->rx_lock);
@@ -586,7 +582,7 @@ static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
 static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 {
 	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-	unsigned short lsr;
+	unsigned int lsr;
 
 	lsr = UART_GET_LSR(uart);
 	if (lsr & TEMT)
@@ -598,7 +594,7 @@ static unsigned int bfin_serial_tx_empty(struct uart_port *port)
 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);
+	u32 lcr = UART_GET_LCR(uart);
 	if (break_state)
 		lcr |= SB;
 	else
@@ -745,7 +741,7 @@ static int bfin_serial_startup(struct uart_port *port)
 		}
 
 		/* CTS RTS PINs are negative assertive. */
-		UART_PUT_MCR(uart, ACTS);
+		UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
 		UART_SET_IER(uart, EDSSI);
 	}
 #endif
@@ -803,7 +799,7 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
 	unsigned long flags;
 	unsigned int baud, quot;
-	unsigned short val, ier, lcr = 0;
+	unsigned int ier, lcr = 0;
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS8:
@@ -875,26 +871,23 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	/* Disable UART */
 	ier = UART_GET_IER(uart);
+	UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
 	UART_DISABLE_INTS(uart);
 
-	/* Set DLAB in LCR to Access DLL and DLH */
+	/* Set DLAB in LCR to Access CLK */
 	UART_SET_DLAB(uart);
 
-	UART_PUT_DLL(uart, quot & 0xFF);
-	UART_PUT_DLH(uart, (quot >> 8) & 0xFF);
+	UART_PUT_CLK(uart, quot);
 	SSYNC();
 
 	/* Clear DLAB in LCR to Access THR RBR IER */
 	UART_CLEAR_DLAB(uart);
 
-	UART_PUT_LCR(uart, lcr);
+	UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
 
 	/* Enable UART */
 	UART_ENABLE_INTS(uart, ier);
-
-	val = UART_GET_GCTL(uart);
-	val |= UCEN;
-	UART_PUT_GCTL(uart, val);
+	UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
 
 	/* Port speed changed, update the per-port timeout. */
 	uart_update_timeout(port, termios->c_cflag, baud);
@@ -954,17 +947,17 @@ bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 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;
+	unsigned int val;
 
 	switch (ld) {
 	case N_IRDA:
 		val = UART_GET_GCTL(uart);
-		val |= (IREN | RPOLC);
+		val |= (UMOD_IRDA | RPOLC);
 		UART_PUT_GCTL(uart, val);
 		break;
 	default:
 		val = UART_GET_GCTL(uart);
-		val &= ~(IREN | RPOLC);
+		val &= ~(UMOD_MASK | RPOLC);
 		UART_PUT_GCTL(uart, val);
 	}
 }
@@ -972,13 +965,13 @@ static void bfin_serial_set_ldisc(struct uart_port *port, int ld)
 static void bfin_serial_reset_irda(struct uart_port *port)
 {
 	struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
-	unsigned short val;
+	unsigned int val;
 
 	val = UART_GET_GCTL(uart);
-	val &= ~(IREN | RPOLC);
+	val &= ~(UMOD_MASK | RPOLC);
 	UART_PUT_GCTL(uart, val);
 	SSYNC();
-	val |= (IREN | RPOLC);
+	val |= (UMOD_IRDA | RPOLC);
 	UART_PUT_GCTL(uart, val);
 	SSYNC();
 }
@@ -1070,12 +1063,12 @@ static void __init
 bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 			   int *parity, int *bits)
 {
-	unsigned short status;
+	unsigned int status;
 
 	status = UART_GET_IER(uart) & (ERBFI | ETBEI);
 	if (status == (ERBFI | ETBEI)) {
 		/* ok, the port was enabled */
-		u16 lcr, dlh, dll;
+		u32 lcr, clk;
 
 		lcr = UART_GET_LCR(uart);
 
@@ -1086,30 +1079,17 @@ bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 			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 */
+		*bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
+
+		/* Set DLAB in LCR to Access CLK */
 		UART_SET_DLAB(uart);
 
-		dll = UART_GET_DLL(uart);
-		dlh = UART_GET_DLH(uart);
+		clk = UART_GET_CLK(uart);
 
 		/* Clear DLAB in LCR to Access THR RBR IER */
 		UART_CLEAR_DLAB(uart);
 
-		*baud = get_sclk() / (16*(dll | dlh << 8));
+		*baud = get_sclk() / (16*clk);
 	}
 	pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
 }
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
index 5b07c0c3a10..7264d4d2671 100644
--- a/drivers/tty/serial/crisv10.c
+++ b/drivers/tty/serial/crisv10.c
@@ -952,19 +952,6 @@ static const struct control_pins e100_modem_pins[NR_PORTS] =
 /* 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)
 {
@@ -3150,7 +3137,7 @@ static int rs_raw_write(struct tty_struct *tty,
 
 	/* first some sanity checks */
 
-	if (!tty || !info->xmit.buf || !tmp_buf)
+	if (!tty || !info->xmit.buf)
 		return 0;
 
 #ifdef SERIAL_DEBUG_DATA
@@ -3989,7 +3976,7 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 	 */
 	if (tty_hung_up_p(filp) ||
 	    (info->flags & ASYNC_CLOSING)) {
-		wait_event_interruptible_tty(info->close_wait,
+		wait_event_interruptible_tty(tty, info->close_wait,
 			!(info->flags & ASYNC_CLOSING));
 #ifdef SERIAL_DO_RESTART
 		if (info->flags & ASYNC_HUP_NOTIFY)
@@ -4065,9 +4052,9 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 		printk("block_til_ready blocking: ttyS%d, count = %d\n",
 		       info->line, info->count);
 #endif
-		tty_unlock();
+		tty_unlock(tty);
 		schedule();
-		tty_lock();
+		tty_lock(tty);
 	}
 	set_current_state(TASK_RUNNING);
 	remove_wait_queue(&info->open_wait, &wait);
@@ -4106,7 +4093,6 @@ rs_open(struct tty_struct *tty, struct file * filp)
 {
 	struct e100_serial	*info;
 	int 			retval;
-	unsigned long           page;
 	int                     allocated_resources = 0;
 
 	info = rs_table + tty->index;
@@ -4124,23 +4110,12 @@ rs_open(struct tty_struct *tty, struct file * filp)
 
 	tty->low_latency = !!(info->flags & ASYNC_LOW_LATENCY);
 
-	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,
+		wait_event_interruptible_tty(tty, info->close_wait,
 			!(info->flags & ASYNC_CLOSING));
 #ifdef SERIAL_DO_RESTART
 		return ((info->flags & ASYNC_HUP_NOTIFY) ?
@@ -4487,6 +4462,7 @@ static int __init rs_init(void)
 				info->enabled = 0;
 			}
 		}
+		tty_port_init(&info->port);
 		info->uses_dma_in = 0;
 		info->uses_dma_out = 0;
 		info->line = i;
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 7081600bede..ec56d8397aa 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -370,6 +370,8 @@ static void mxs_auart_settermios(struct uart_port *u,
 
 	writel(ctrl, u->membase + AUART_LINECTRL);
 	writel(ctrl2, u->membase + AUART_CTRL2);
+
+	uart_update_timeout(u, termios->c_cflag, baud);
 }
 
 static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index e8c9cee07d0..5410c063726 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -12,10 +12,13 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 #include <linux/serial_core.h>
 #include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
+#include <linux/of_serial.h>
 #include <linux/of_platform.h>
 #include <linux/nwpserial.h>
 
@@ -24,6 +27,26 @@ struct of_serial_info {
 	int line;
 };
 
+#ifdef CONFIG_ARCH_TEGRA
+void tegra_serial_handle_break(struct uart_port *p)
+{
+	unsigned int status, tmout = 10000;
+
+	do {
+		status = p->serial_in(p, UART_LSR);
+		if (status & (UART_LSR_FIFOE | UART_LSR_BRK_ERROR_BITS))
+			status = p->serial_in(p, UART_RX);
+		else
+			break;
+		if (--tmout == 0)
+			break;
+		udelay(1);
+	} while (1);
+}
+/* FIXME remove this export when tegra finishes conversion to open firmware */
+EXPORT_SYMBOL_GPL(tegra_serial_handle_break);
+#endif
+
 /*
  * Fill a struct uart_port for a given device node
  */
@@ -84,6 +107,9 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev,
 		| UPF_FIXED_PORT | UPF_FIXED_TYPE;
 	port->dev = &ofdev->dev;
 
+	if (type == PORT_TEGRA)
+		port->handle_break = tegra_serial_handle_break;
+
 	return 0;
 }
 
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index d00b38eb268..d3cda0cb2df 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -44,6 +44,13 @@
 #include <plat/dmtimer.h>
 #include <plat/omap-serial.h>
 
+#define UART_BUILD_REVISION(x, y)	(((x) << 8) | (y))
+
+#define OMAP_UART_REV_42 0x0402
+#define OMAP_UART_REV_46 0x0406
+#define OMAP_UART_REV_52 0x0502
+#define OMAP_UART_REV_63 0x0603
+
 #define DEFAULT_CLK_SPEED 48000000 /* 48Mhz*/
 
 /* SCR register bitmasks */
@@ -53,6 +60,17 @@
 #define OMAP_UART_FCR_RX_FIFO_TRIG_SHIFT		6
 #define OMAP_UART_FCR_RX_FIFO_TRIG_MASK			(0x3 << 6)
 
+/* MVR register bitmasks */
+#define OMAP_UART_MVR_SCHEME_SHIFT	30
+
+#define OMAP_UART_LEGACY_MVR_MAJ_MASK	0xf0
+#define OMAP_UART_LEGACY_MVR_MAJ_SHIFT	4
+#define OMAP_UART_LEGACY_MVR_MIN_MASK	0x0f
+
+#define OMAP_UART_MVR_MAJ_MASK		0x700
+#define OMAP_UART_MVR_MAJ_SHIFT		8
+#define OMAP_UART_MVR_MIN_MASK		0x3f
+
 static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 
 /* Forward declaration of functions */
@@ -1346,6 +1364,59 @@ static void uart_tx_dma_callback(int lch, u16 ch_status, void *data)
 	return;
 }
 
+static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
+{
+	u32 mvr, scheme;
+	u16 revision, major, minor;
+
+	mvr = serial_in(up, UART_OMAP_MVER);
+
+	/* Check revision register scheme */
+	scheme = mvr >> OMAP_UART_MVR_SCHEME_SHIFT;
+
+	switch (scheme) {
+	case 0: /* Legacy Scheme: OMAP2/3 */
+		/* MINOR_REV[0:4], MAJOR_REV[4:7] */
+		major = (mvr & OMAP_UART_LEGACY_MVR_MAJ_MASK) >>
+					OMAP_UART_LEGACY_MVR_MAJ_SHIFT;
+		minor = (mvr & OMAP_UART_LEGACY_MVR_MIN_MASK);
+		break;
+	case 1:
+		/* New Scheme: OMAP4+ */
+		/* MINOR_REV[0:5], MAJOR_REV[8:10] */
+		major = (mvr & OMAP_UART_MVR_MAJ_MASK) >>
+					OMAP_UART_MVR_MAJ_SHIFT;
+		minor = (mvr & OMAP_UART_MVR_MIN_MASK);
+		break;
+	default:
+		dev_warn(&up->pdev->dev,
+			"Unknown %s revision, defaulting to highest\n",
+			up->name);
+		/* highest possible revision */
+		major = 0xff;
+		minor = 0xff;
+	}
+
+	/* normalize revision for the driver */
+	revision = UART_BUILD_REVISION(major, minor);
+
+	switch (revision) {
+	case OMAP_UART_REV_46:
+		up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
+				UART_ERRATA_i291_DMA_FORCEIDLE);
+		break;
+	case OMAP_UART_REV_52:
+		up->errata |= (UART_ERRATA_i202_MDR1_ACCESS |
+				UART_ERRATA_i291_DMA_FORCEIDLE);
+		break;
+	case OMAP_UART_REV_63:
+		up->errata |= UART_ERRATA_i202_MDR1_ACCESS;
+		break;
+	default:
+		break;
+	}
+}
+
 static struct omap_uart_port_info *of_get_uart_port_info(struct device *dev)
 {
 	struct omap_uart_port_info *omap_up_info;
@@ -1439,7 +1510,6 @@ static int serial_omap_probe(struct platform_device *pdev)
 						"%d\n", DEFAULT_CLK_SPEED);
 	}
 	up->uart_dma.uart_base = mem->start;
-	up->errata = omap_up_info->errata;
 
 	if (omap_up_info->dma_enabled) {
 		up->uart_dma.uart_dma_tx = dma_tx->start;
@@ -1469,6 +1539,8 @@ static int serial_omap_probe(struct platform_device *pdev)
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_sync(&pdev->dev);
 
+	omap_serial_fill_features_erratas(up);
+
 	ui[up->port.line] = up;
 	serial_omap_add_console_port(up);
 
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index c2816f49480..4fdec6a6b75 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -39,6 +39,7 @@ enum {
 	PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
 	PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
 	PCH_UART_HANDLED_MS_INT_SHIFT,
+	PCH_UART_HANDLED_LS_INT_SHIFT,
 };
 
 enum {
@@ -63,6 +64,8 @@ enum {
 					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_HANDLED_LS_INT	(1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1))
+
 #define PCH_UART_RBR		0x00
 #define PCH_UART_THR		0x00
 
@@ -229,7 +232,6 @@ struct eg20t_port {
 	int start_tx;
 	int start_rx;
 	int tx_empty;
-	int int_dis_flag;
 	int trigger;
 	int trigger_level;
 	struct pch_uart_buffer rxbuf;
@@ -237,7 +239,6 @@ struct eg20t_port {
 	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;
@@ -560,14 +561,10 @@ static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
 	return i;
 }
 
-static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv)
+static unsigned char 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;
+	return ioread8(priv->membase + UART_IIR) &\
+		      (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
 }
 
 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
@@ -666,10 +663,13 @@ static void pch_free_dma(struct uart_port *port)
 		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));
+
+	if (priv->rx_buf_dma) {
+		dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
+				  priv->rx_buf_dma);
+		priv->rx_buf_virt = NULL;
+		priv->rx_buf_dma = 0;
+	}
 
 	return;
 }
@@ -1053,12 +1053,17 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
 	unsigned int handled;
 	u8 lsr;
 	int ret = 0;
-	unsigned int iid;
+	unsigned char iid;
 	unsigned long flags;
+	int next = 1;
+	u8 msr;
 
 	spin_lock_irqsave(&priv->port.lock, flags);
 	handled = 0;
-	while ((iid = pch_uart_hal_get_iid(priv)) > 1) {
+	while (next) {
+		iid = pch_uart_hal_get_iid(priv);
+		if (iid & PCH_UART_IIR_IP) /* No Interrupt */
+			break;
 		switch (iid) {
 		case PCH_UART_IID_RLS:	/* Receiver Line Status */
 			lsr = pch_uart_hal_get_line_status(priv);
@@ -1066,6 +1071,8 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
 						UART_LSR_PE | UART_LSR_OE)) {
 				pch_uart_err_ir(priv, lsr);
 				ret = PCH_UART_HANDLED_RX_ERR_INT;
+			} else {
+				ret = PCH_UART_HANDLED_LS_INT;
 			}
 			break;
 		case PCH_UART_IID_RDR:	/* Received Data Ready */
@@ -1092,20 +1099,22 @@ static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
 				ret = handle_tx(priv);
 			break;
 		case PCH_UART_IID_MS:	/* Modem Status */
-			ret = PCH_UART_HANDLED_MS_INT;
+			msr = pch_uart_hal_get_modem(priv);
+			next = 0; /* MS ir prioirty is the lowest. So, MS ir
+				     means final interrupt */
+			if ((msr & UART_MSR_ANY_DELTA) == 0)
+				break;
+			ret |= PCH_UART_HANDLED_MS_INT;
 			break;
 		default:	/* Never junp to this label */
-			dev_err(priv->port.dev, "%s:iid=%d (%lu)\n", __func__,
+			dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
 				iid, jiffies);
 			ret = -1;
+			next = 0;
 			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);
@@ -1200,7 +1209,6 @@ static void pch_uart_stop_rx(struct uart_port *port)
 	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. */
@@ -1447,7 +1455,6 @@ static int pch_uart_verify_port(struct uart_port *port,
 			__func__);
 		return -EOPNOTSUPP;
 #endif
-		priv->use_dma_flag = 1;
 		dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
 		if (!priv->use_dma)
 			pch_request_dma(port);
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9c4c05b2825..246b823c1b2 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2282,6 +2282,7 @@ void uart_unregister_driver(struct uart_driver *drv)
 	tty_unregister_driver(p);
 	put_tty_driver(p);
 	kfree(drv->state);
+	drv->state = NULL;
 	drv->tty_driver = NULL;
 }