Merge tag 'tty-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty / serial driver update from Greg KH:
 "Here's the big tty / serial driver update for 3.17-rc1.

  Nothing major, just a number of fixes and new features for different
  serial drivers, and some more tty core fixes and documentation of the
  tty locks.

  All of these have been in linux-next for a while"

* tag 'tty-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (82 commits)
  tty/n_gsm.c: fix a memory leak in gsmld_open
  pch_uart: don't hardcode PCI slot to get DMA device
  tty: n_gsm, use setup_timer
  Revert "ARC: [arcfpga] stdout-path now suffices for earlycon/console"
  serial: sc16is7xx: Correct initialization of s->clk
  serial: 8250_dw: Add support for deferred probing
  serial: 8250_dw: Add optional reset control support
  serial: st-asc: Fix overflow in baudrate calculation
  serial: st-asc: Don't call BUG in asc_console_setup()
  tty: serial: msm: Make of_device_id array const
  tty/n_gsm.c: get gsm->num after gsm_activate_mux
  serial/core: Fix too big allocation for attribute member
  drivers/tty/serial: use correct type for dma_map/unmap
  serial: altera_jtaguart: Fix putchar function passed to uart_console_write()
  serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers
  Serial: allow port drivers to have a default attribute group
  tty: kgdb_nmi: Automatically manage tty enable
  serial: altera_jtaguart: Adpot uart_console_write()
  serial: samsung: improve code clarity by defining a variable
  serial: samsung: correct the case and default order in switch
  ...

70 files changed, 1403 insertions, 912 deletions

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 8320abd1ef14..0ea9986059af 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -2347,8 +2347,6 @@ static void mgslpc_close(struct tty_struct *tty, struct file * filp)
 		printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
 			 __FILE__, __LINE__, info->device_name, port->count);
 
-	WARN_ON(!port->count);
-
 	if (tty_port_close_start(port, tty, filp) == 0)
 		goto cleanup;
 
@@ -2510,7 +2508,7 @@ static int mgslpc_open(struct tty_struct *tty, struct file * filp)
 			 __FILE__, __LINE__, tty->driver->name, port->count);
 
 	/* If port is closing, signal caller to try again */
-	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING){
+	if (port->flags & ASYNC_CLOSING){
 		wait_event_interruptible_tty(tty, port->close_wait,
 					     !(port->flags & ASYNC_CLOSING));
 		retval = ((port->flags & ASYNC_HUP_NOTIFY) ?
diff --git a/drivers/tty/cyclades.c b/drivers/tty/cyclades.c
index a57bb5ab761c..fd66f57390d0 100644
--- a/drivers/tty/cyclades.c
+++ b/drivers/tty/cyclades.c
@@ -1579,7 +1579,7 @@ static int cy_open(struct tty_struct *tty, struct file *filp)
 	/*
 	 * If the port is the middle of closing, bail out now
 	 */
-	if (tty_hung_up_p(filp) || (info->port.flags & ASYNC_CLOSING)) {
+	if (info->port.flags & ASYNC_CLOSING) {
 		wait_event_interruptible_tty(tty, info->port.close_wait,
 				!(info->port.flags & ASYNC_CLOSING));
 		return (info->port.flags & ASYNC_HUP_NOTIFY) ? -EAGAIN: -ERESTARTSYS;
diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c
index 17ee3bf0926b..345cebb07ae7 100644
--- a/drivers/tty/ipwireless/tty.c
+++ b/drivers/tty/ipwireless/tty.c
@@ -93,11 +93,6 @@ static int ipw_open(struct tty_struct *linux_tty, struct file *filp)
 		return -ENODEV;
 
 	mutex_lock(&tty->ipw_tty_mutex);
-
-	if (tty->closing) {
-		mutex_unlock(&tty->ipw_tty_mutex);
-		return -ENODEV;
-	}
 	if (tty->port.count == 0)
 		tty->tx_bytes_queued = 0;
 
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 2ebe47b78a3e..152443ab1447 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2088,9 +2088,7 @@ static int gsm_activate_mux(struct gsm_mux *gsm)
 	struct gsm_dlci *dlci;
 	int i = 0;
 
-	init_timer(&gsm->t2_timer);
-	gsm->t2_timer.function = gsm_control_retransmit;
-	gsm->t2_timer.data = (unsigned long)gsm;
+	setup_timer(&gsm->t2_timer, gsm_control_retransmit, (unsigned long)gsm);
 	init_waitqueue_head(&gsm->event);
 	spin_lock_init(&gsm->control_lock);
 	spin_lock_init(&gsm->tx_lock);
@@ -2230,8 +2228,7 @@ static int gsmld_output(struct gsm_mux *gsm, u8 *data, int len)
 
 static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
 {
-	int ret, i;
-	int base = gsm->num << 6; /* Base for this MUX */
+	int ret, i, base;
 
 	gsm->tty = tty_kref_get(tty);
 	gsm->output = gsmld_output;
@@ -2241,6 +2238,7 @@ static int gsmld_attach_gsm(struct tty_struct *tty, struct gsm_mux *gsm)
 	else {
 		/* Don't register device 0 - this is the control channel and not
 		   a usable tty interface */
+		base = gsm->num << 6; /* Base for this MUX */
 		for (i = 1; i < NUM_DLCI; i++)
 			tty_register_device(gsm_tty_driver, base + i, NULL);
 	}
@@ -2368,6 +2366,7 @@ static void gsmld_close(struct tty_struct *tty)
 static int gsmld_open(struct tty_struct *tty)
 {
 	struct gsm_mux *gsm;
+	int ret;
 
 	if (tty->ops->write == NULL)
 		return -EINVAL;
@@ -2382,7 +2381,13 @@ static int gsmld_open(struct tty_struct *tty)
 
 	/* Attach the initial passive connection */
 	gsm->encoding = 1;
-	return gsmld_attach_gsm(tty, gsm);
+
+	ret = gsmld_attach_gsm(tty, gsm);
+	if (ret != 0) {
+		gsm_cleanup_mux(gsm);
+		mux_put(gsm);
+	}
+	return ret;
 }
 
 /**
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 25c9bc783722..9bbdb1de12e2 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -316,7 +316,7 @@ done:
  *	pty_common_install		-	set up the pty pair
  *	@driver: the pty driver
  *	@tty: the tty being instantiated
- *	@bool: legacy, true if this is BSD style
+ *	@legacy: true if this is BSD style
  *
  *	Perform the initial set up for the tty/pty pair. Called from the
  *	tty layer when the port is first opened.
@@ -331,18 +331,17 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
 	int idx = tty->index;
 	int retval = -ENOMEM;
 
-	o_tty = alloc_tty_struct();
-	if (!o_tty)
-		goto err;
 	ports[0] = kmalloc(sizeof **ports, GFP_KERNEL);
 	ports[1] = kmalloc(sizeof **ports, GFP_KERNEL);
 	if (!ports[0] || !ports[1])
-		goto err_free_tty;
+		goto err;
 	if (!try_module_get(driver->other->owner)) {
 		/* This cannot in fact currently happen */
-		goto err_free_tty;
+		goto err;
 	}
-	initialize_tty_struct(o_tty, driver->other, idx);
+	o_tty = alloc_tty_struct(driver->other, idx);
+	if (!o_tty)
+		goto err_put_module;
 
 	if (legacy) {
 		/* We always use new tty termios data so we can do this
@@ -387,12 +386,12 @@ err_free_termios:
 		tty_free_termios(tty);
 err_deinit_tty:
 	deinitialize_tty_struct(o_tty);
-	module_put(o_tty->driver->owner);
-err_free_tty:
-	kfree(ports[0]);
-	kfree(ports[1]);
 	free_tty_struct(o_tty);
+err_put_module:
+	module_put(driver->other->owner);
 err:
+	kfree(ports[0]);
+	kfree(ports[1]);
 	return retval;
 }
 
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index c7e8b60b6177..9b208bd686e6 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -78,10 +78,6 @@ static void serial21285_stop_rx(struct uart_port *port)
 	}
 }
 
-static void serial21285_enable_ms(struct uart_port *port)
-{
-}
-
 static irqreturn_t serial21285_rx_chars(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
@@ -345,7 +341,6 @@ static struct uart_ops serial21285_ops = {
 	.stop_tx	= serial21285_stop_tx,
 	.start_tx	= serial21285_start_tx,
 	.stop_rx	= serial21285_stop_rx,
-	.enable_ms	= serial21285_enable_ms,
 	.break_ctl	= serial21285_break_ctl,
 	.startup	= serial21285_startup,
 	.shutdown	= serial21285_shutdown,
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index 1ebf8538b4fa..1b08c918cd51 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -12,6 +12,7 @@
  */
 
 #include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
 #include <linux/dmaengine.h>
 
 struct uart_8250_dma {
@@ -60,6 +61,7 @@ struct serial8250_config {
 	unsigned short	fifo_size;
 	unsigned short	tx_loadsz;
 	unsigned char	fcr;
+	unsigned char	rxtrig_bytes[UART_FCR_R_TRIG_MAX_STATE];
 	unsigned int	flags;
 };
 
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 7a91c6d1eb7d..1d42dba6121d 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -31,7 +31,6 @@
 #include <linux/tty.h>
 #include <linux/ratelimit.h>
 #include <linux/tty_flip.h>
-#include <linux/serial_reg.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
 #include <linux/serial_8250.h>
@@ -161,6 +160,7 @@ static const struct serial8250_config uart_config[] = {
 		.fifo_size	= 16,
 		.tx_loadsz	= 16,
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+		.rxtrig_bytes	= {1, 4, 8, 14},
 		.flags		= UART_CAP_FIFO,
 	},
 	[PORT_CIRRUS] = {
@@ -180,6 +180,7 @@ static const struct serial8250_config uart_config[] = {
 		.tx_loadsz	= 16,
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
 				  UART_FCR_T_TRIG_00,
+		.rxtrig_bytes	= {8, 16, 24, 28},
 		.flags		= UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
 	},
 	[PORT_16750] = {
@@ -188,6 +189,7 @@ static const struct serial8250_config uart_config[] = {
 		.tx_loadsz	= 64,
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10 |
 				  UART_FCR7_64BYTE,
+		.rxtrig_bytes	= {1, 16, 32, 56},
 		.flags		= UART_CAP_FIFO | UART_CAP_SLEEP | UART_CAP_AFE,
 	},
 	[PORT_STARTECH] = {
@@ -209,6 +211,7 @@ static const struct serial8250_config uart_config[] = {
 		.tx_loadsz	= 32,
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
 				  UART_FCR_T_TRIG_10,
+		.rxtrig_bytes	= {8, 16, 56, 60},
 		.flags		= UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP,
 	},
 	[PORT_16850] = {
@@ -266,6 +269,7 @@ static const struct serial8250_config uart_config[] = {
 		.tx_loadsz	= 8,
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_01 |
 				  UART_FCR_T_TRIG_01,
+		.rxtrig_bytes	= {1, 4, 8, 14},
 		.flags		= UART_CAP_FIFO | UART_CAP_RTOIE,
 	},
 	[PORT_XR17D15X] = {
@@ -439,8 +443,7 @@ static int exar_handle_irq(struct uart_port *port);
 
 static void set_io_from_upio(struct uart_port *p)
 {
-	struct uart_8250_port *up =
-		container_of(p, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(p);
 
 	up->dl_read = default_serial_dl_read;
 	up->dl_write = default_serial_dl_write;
@@ -531,11 +534,8 @@ 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);
+	serial_out(p, UART_FCR, p->fcr);
 }
 EXPORT_SYMBOL_GPL(serial8250_clear_and_reinit_fifos);
 
@@ -1277,8 +1277,7 @@ static inline void __stop_tx(struct uart_8250_port *p)
 
 static void serial8250_stop_tx(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	__stop_tx(up);
 
@@ -1293,8 +1292,7 @@ static void serial8250_stop_tx(struct uart_port *port)
 
 static void serial8250_start_tx(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	if (up->dma && !serial8250_tx_dma(up)) {
 		return;
@@ -1322,8 +1320,7 @@ static void serial8250_start_tx(struct uart_port *port)
 
 static void serial8250_stop_rx(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	up->ier &= ~UART_IER_RLSI;
 	up->port.read_status_mask &= ~UART_LSR_DR;
@@ -1332,8 +1329,7 @@ static void serial8250_stop_rx(struct uart_port *port)
 
 static void serial8250_enable_ms(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	/* no MSR capabilities */
 	if (up->bugs & UART_BUG_NOMSR)
@@ -1499,8 +1495,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
 {
 	unsigned char status;
 	unsigned long flags;
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	int dma_err = 0;
 
 	if (iir & UART_IIR_NO_INT)
@@ -1785,8 +1780,7 @@ static void serial8250_backup_timeout(unsigned long data)
 
 static unsigned int serial8250_tx_empty(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned long flags;
 	unsigned int lsr;
 
@@ -1800,8 +1794,7 @@ static unsigned int serial8250_tx_empty(struct uart_port *port)
 
 static unsigned int serial8250_get_mctrl(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned int status;
 	unsigned int ret;
 
@@ -1821,8 +1814,7 @@ static unsigned int serial8250_get_mctrl(struct uart_port *port)
 
 static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned char mcr = 0;
 
 	if (mctrl & TIOCM_RTS)
@@ -1843,8 +1835,7 @@ static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
 
 static void serial8250_break_ctl(struct uart_port *port, int break_state)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned long flags;
 
 	spin_lock_irqsave(&port->lock, flags);
@@ -1911,8 +1902,7 @@ static void serial8250_put_poll_char(struct uart_port *port,
 			 unsigned char c)
 {
 	unsigned int ier;
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	/*
 	 *	First save the IER then disable the interrupts
@@ -1941,8 +1931,7 @@ static void serial8250_put_poll_char(struct uart_port *port,
 
 static int serial8250_startup(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned long flags;
 	unsigned char lsr, iir;
 	int retval;
@@ -2194,8 +2183,7 @@ dont_test_tx_en:
 
 static void serial8250_shutdown(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned long flags;
 
 	/*
@@ -2268,12 +2256,10 @@ void
 serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 		          struct ktermios *old)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
-	unsigned char cval, fcr = 0;
+	struct uart_8250_port *up = up_to_u8250p(port);
+	unsigned char cval;
 	unsigned long flags;
 	unsigned int baud, quot;
-	int fifo_bug = 0;
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
@@ -2296,7 +2282,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	if (termios->c_cflag & PARENB) {
 		cval |= UART_LCR_PARITY;
 		if (up->bugs & UART_BUG_PARITY)
-			fifo_bug = 1;
+			up->fifo_bug = true;
 	}
 	if (!(termios->c_cflag & PARODD))
 		cval |= UART_LCR_EPAR;
@@ -2320,10 +2306,10 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 		quot++;
 
 	if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
-		fcr = uart_config[port->type].fcr;
-		if ((baud < 2400 && !up->dma) || fifo_bug) {
-			fcr &= ~UART_FCR_TRIGGER_MASK;
-			fcr |= UART_FCR_TRIGGER_1;
+		/* NOTE: If fifo_bug is not set, a user can set RX_trigger. */
+		if ((baud < 2400 && !up->dma) || up->fifo_bug) {
+			up->fcr &= ~UART_FCR_TRIGGER_MASK;
+			up->fcr |= UART_FCR_TRIGGER_1;
 		}
 	}
 
@@ -2456,15 +2442,15 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	 * is written without DLAB set, this mode will be disabled.
 	 */
 	if (port->type == PORT_16750)
-		serial_port_out(port, UART_FCR, fcr);
+		serial_port_out(port, UART_FCR, up->fcr);
 
 	serial_port_out(port, UART_LCR, cval);		/* reset DLAB */
 	up->lcr = cval;					/* Save LCR */
 	if (port->type != PORT_16750) {
 		/* emulated UARTs (Lucent Venus 167x) need two steps */
-		if (fcr & UART_FCR_ENABLE_FIFO)
+		if (up->fcr & UART_FCR_ENABLE_FIFO)
 			serial_port_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
-		serial_port_out(port, UART_FCR, fcr);		/* set fcr */
+		serial_port_out(port, UART_FCR, up->fcr);	/* set fcr */
 	}
 	serial8250_set_mctrl(port, port->mctrl);
 	spin_unlock_irqrestore(&port->lock, flags);
@@ -2498,8 +2484,7 @@ serial8250_set_ldisc(struct uart_port *port, int new)
 void serial8250_do_pm(struct uart_port *port, unsigned int state,
 		      unsigned int oldstate)
 {
-	struct uart_8250_port *p =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *p = up_to_u8250p(port);
 
 	serial8250_set_sleep(p, state != 0);
 }
@@ -2630,8 +2615,7 @@ static void serial8250_release_rsa_resource(struct uart_8250_port *up)
 
 static void serial8250_release_port(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	serial8250_release_std_resource(up);
 	if (port->type == PORT_RSA)
@@ -2640,8 +2624,7 @@ static void serial8250_release_port(struct uart_port *port)
 
 static int serial8250_request_port(struct uart_port *port)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 	int ret;
 
 	if (port->type == PORT_8250_CIR)
@@ -2657,10 +2640,149 @@ static int serial8250_request_port(struct uart_port *port)
 	return ret;
 }
 
-static void serial8250_config_port(struct uart_port *port, int flags)
+static int fcr_get_rxtrig_bytes(struct uart_8250_port *up)
+{
+	const struct serial8250_config *conf_type = &uart_config[up->port.type];
+	unsigned char bytes;
+
+	bytes = conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(up->fcr)];
+
+	return bytes ? bytes : -EOPNOTSUPP;
+}
+
+static int bytes_to_fcr_rxtrig(struct uart_8250_port *up, unsigned char bytes)
+{
+	const struct serial8250_config *conf_type = &uart_config[up->port.type];
+	int i;
+
+	if (!conf_type->rxtrig_bytes[UART_FCR_R_TRIG_BITS(UART_FCR_R_TRIG_00)])
+		return -EOPNOTSUPP;
+
+	for (i = 1; i < UART_FCR_R_TRIG_MAX_STATE; i++) {
+		if (bytes < conf_type->rxtrig_bytes[i])
+			/* Use the nearest lower value */
+			return (--i) << UART_FCR_R_TRIG_SHIFT;
+	}
+
+	return UART_FCR_R_TRIG_11;
+}
+
+static int do_get_rxtrig(struct tty_port *port)
+{
+	struct uart_state *state = container_of(port, struct uart_state, port);
+	struct uart_port *uport = state->uart_port;
+	struct uart_8250_port *up =
+		container_of(uport, struct uart_8250_port, port);
+
+	if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1)
+		return -EINVAL;
+
+	return fcr_get_rxtrig_bytes(up);
+}
+
+static int do_serial8250_get_rxtrig(struct tty_port *port)
+{
+	int rxtrig_bytes;
+
+	mutex_lock(&port->mutex);
+	rxtrig_bytes = do_get_rxtrig(port);
+	mutex_unlock(&port->mutex);
+
+	return rxtrig_bytes;
+}
+
+static ssize_t serial8250_get_attr_rx_trig_bytes(struct device *dev,
+	struct device_attribute *attr, char *buf)
 {
+	struct tty_port *port = dev_get_drvdata(dev);
+	int rxtrig_bytes;
+
+	rxtrig_bytes = do_serial8250_get_rxtrig(port);
+	if (rxtrig_bytes < 0)
+		return rxtrig_bytes;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", rxtrig_bytes);
+}
+
+static int do_set_rxtrig(struct tty_port *port, unsigned char bytes)
+{
+	struct uart_state *state = container_of(port, struct uart_state, port);
+	struct uart_port *uport = state->uart_port;
 	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+		container_of(uport, struct uart_8250_port, port);
+	int rxtrig;
+
+	if (!(up->capabilities & UART_CAP_FIFO) || uport->fifosize <= 1 ||
+	    up->fifo_bug)
+		return -EINVAL;
+
+	rxtrig = bytes_to_fcr_rxtrig(up, bytes);
+	if (rxtrig < 0)
+		return rxtrig;
+
+	serial8250_clear_fifos(up);
+	up->fcr &= ~UART_FCR_TRIGGER_MASK;
+	up->fcr |= (unsigned char)rxtrig;
+	serial_out(up, UART_FCR, up->fcr);
+	return 0;
+}
+
+static int do_serial8250_set_rxtrig(struct tty_port *port, unsigned char bytes)
+{
+	int ret;
+
+	mutex_lock(&port->mutex);
+	ret = do_set_rxtrig(port, bytes);
+	mutex_unlock(&port->mutex);
+
+	return ret;
+}
+
+static ssize_t serial8250_set_attr_rx_trig_bytes(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct tty_port *port = dev_get_drvdata(dev);
+	unsigned char bytes;
+	int ret;
+
+	if (!count)
+		return -EINVAL;
+
+	ret = kstrtou8(buf, 10, &bytes);
+	if (ret < 0)
+		return ret;
+
+	ret = do_serial8250_set_rxtrig(port, bytes);
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR(rx_trig_bytes, S_IRUSR | S_IWUSR | S_IRGRP,
+		   serial8250_get_attr_rx_trig_bytes,
+		   serial8250_set_attr_rx_trig_bytes);
+
+static struct attribute *serial8250_dev_attrs[] = {
+	&dev_attr_rx_trig_bytes.attr,
+	NULL,
+	};
+
+static struct attribute_group serial8250_dev_attr_group = {
+	.attrs = serial8250_dev_attrs,
+	};
+
+static void register_dev_spec_attr_grp(struct uart_8250_port *up)
+{
+	const struct serial8250_config *conf_type = &uart_config[up->port.type];
+
+	if (conf_type->rxtrig_bytes[0])
+		up->port.attr_group = &serial8250_dev_attr_group;
+}
+
+static void serial8250_config_port(struct uart_port *port, int flags)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
 	int probeflags = PROBE_ANY;
 	int ret;
 
@@ -2705,6 +2827,9 @@ static void serial8250_config_port(struct uart_port *port, int flags)
 	if ((port->type == PORT_XR17V35X) ||
 	   (port->type == PORT_XR17D15X))
 		port->handle_irq = exar_handle_irq;
+
+	register_dev_spec_attr_grp(up);
+	up->fcr = uart_config[up->port.type].fcr;
 }
 
 static int
@@ -2859,8 +2984,7 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev)
 
 static void serial8250_console_putchar(struct uart_port *port, int ch)
 {
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	wait_for_xmitr(up, UART_LSR_THRE);
 	serial_port_out(port, UART_TX, ch);
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 51b307aab75e..4db7987ec225 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include <linux/clk.h>
+#include <linux/reset.h>
 #include <linux/pm_runtime.h>
 
 #include <asm/byteorder.h>
@@ -59,73 +60,17 @@ struct dw8250_data {
 	int			last_mcr;
 	int			line;
 	struct clk		*clk;
+	struct clk		*pclk;
+	struct reset_control	*rst;
 	struct uart_8250_dma	dma;
 };
 
-struct dw8250_acpi_desc {
-	void (*set_termios)(struct uart_port *p, struct ktermios *termios,
-			    struct ktermios *old);
-};
-
 #define BYT_PRV_CLK			0x800
 #define BYT_PRV_CLK_EN			(1 << 0)
 #define BYT_PRV_CLK_M_VAL_SHIFT		1
 #define BYT_PRV_CLK_N_VAL_SHIFT		16
 #define BYT_PRV_CLK_UPDATE		(1 << 31)
 
-static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
-			    struct ktermios *old)
-{
-	unsigned int baud = tty_termios_baud_rate(termios);
-	unsigned int m, n;
-	u32 reg;
-
-	/*
-	* For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the
-	* dividers must be adjusted.
-	*
-	* uartclk = (m / n) * 100 MHz, where m <= n
-	*/
-	switch (baud) {
-	case 500000:
-	case 1000000:
-	case 2000000:
-	case 4000000:
-		m = 64;
-		n = 100;
-		p->uartclk = 64000000;
-		break;
-	case 3500000:
-		m = 56;
-		n = 100;
-		p->uartclk = 56000000;
-		break;
-	case 1500000:
-	case 3000000:
-		m = 48;
-		n = 100;
-		p->uartclk = 48000000;
-		break;
-	case 2500000:
-		m = 40;
-		n = 100;
-		p->uartclk = 40000000;
-		break;
-	default:
-		m = 2304;
-		n = 3125;
-		p->uartclk = 73728000;
-	}
-
-	/* Reset the clock */
-	reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
-	writel(reg, p->membase + BYT_PRV_CLK);
-	reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
-	writel(reg, p->membase + BYT_PRV_CLK);
-
-	serial8250_do_set_termios(p, termios, old);
-}
-
 static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value)
 {
 	struct dw8250_data *d = p->private_data;
@@ -141,8 +86,9 @@ static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value)
 
 static void dw8250_force_idle(struct uart_port *p)
 {
-	serial8250_clear_and_reinit_fifos(container_of
-					  (p, struct uart_8250_port, port));
+	struct uart_8250_port *up = up_to_u8250p(p);
+
+	serial8250_clear_and_reinit_fifos(up);
 	(void)p->serial_in(p, UART_RX);
 }
 
@@ -242,6 +188,32 @@ dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
 		pm_runtime_put_sync_suspend(port->dev);
 }
 
+static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
+			       struct ktermios *old)
+{
+	unsigned int baud = tty_termios_baud_rate(termios);
+	struct dw8250_data *d = p->private_data;
+	unsigned int rate;
+	int ret;
+
+	if (IS_ERR(d->clk) || !old)
+		goto out;
+
+	/* Not requesting clock rates below 1.8432Mhz */
+	if (baud < 115200)
+		baud = 115200;
+
+	clk_disable_unprepare(d->clk);
+	rate = clk_round_rate(d->clk, baud * 16);
+	ret = clk_set_rate(d->clk, rate);
+	clk_prepare_enable(d->clk);
+
+	if (!ret)
+		p->uartclk = rate;
+out:
+	serial8250_do_set_termios(p, termios, old);
+}
+
 static bool dw8250_dma_filter(struct dma_chan *chan, void *param)
 {
 	struct dw8250_data *data = param;
@@ -286,6 +258,7 @@ static int dw8250_probe_of(struct uart_port *p,
 			   struct dw8250_data *data)
 {
 	struct device_node	*np = p->dev->of_node;
+	struct uart_8250_port *up = up_to_u8250p(p);
 	u32			val;
 	bool has_ucv = true;
 
@@ -299,7 +272,7 @@ static int dw8250_probe_of(struct uart_port *p,
 		p->membase += 7;
 #endif
 		p->serial_out = dw8250_serial_out_rb;
-		p->flags = ASYNC_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
+		p->flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
 		p->type = PORT_OCTEON;
 		data->usr_reg = 0x27;
 		has_ucv = false;
@@ -318,7 +291,7 @@ static int dw8250_probe_of(struct uart_port *p,
 		}
 	}
 	if (has_ucv)
-		dw8250_setup_port(container_of(p, struct uart_8250_port, port));
+		dw8250_setup_port(up);
 
 	if (!of_property_read_u32(np, "reg-shift", &val))
 		p->regshift = val;
@@ -340,16 +313,10 @@ static int dw8250_probe_of(struct uart_port *p,
 static int dw8250_probe_acpi(struct uart_8250_port *up,
 			     struct dw8250_data *data)
 {
-	const struct acpi_device_id *id;
 	struct uart_port *p = &up->port;
-	struct dw8250_acpi_desc *acpi_desc;
 
 	dw8250_setup_port(up);
 
-	id = acpi_match_device(p->dev->driver->acpi_match_table, p->dev);
-	if (!id)
-		return -ENODEV;
-
 	p->iotype = UPIO_MEM32;
 	p->serial_in = dw8250_serial_in32;
 	p->serial_out = dw8250_serial_out32;
@@ -360,12 +327,7 @@ static int dw8250_probe_acpi(struct uart_8250_port *up,
 	up->dma->rxconf.src_maxburst = p->fifosize / 4;
 	up->dma->txconf.dst_maxburst = p->fifosize / 4;
 
-	acpi_desc = (struct dw8250_acpi_desc *)id->driver_data;
-	if (!acpi_desc)
-		return 0;
-
-	if (acpi_desc->set_termios)
-		p->set_termios = acpi_desc->set_termios;
+	up->port.set_termios = dw8250_set_termios;
 
 	return 0;
 }
@@ -402,11 +364,40 @@ static int dw8250_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	data->usr_reg = DW_UART_USR;
-	data->clk = devm_clk_get(&pdev->dev, NULL);
+	data->clk = devm_clk_get(&pdev->dev, "baudclk");
+	if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER)
+		data->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
 	if (!IS_ERR(data->clk)) {
-		clk_prepare_enable(data->clk);
-		uart.port.uartclk = clk_get_rate(data->clk);
+		err = clk_prepare_enable(data->clk);
+		if (err)
+			dev_warn(&pdev->dev, "could not enable optional baudclk: %d\n",
+				 err);
+		else
+			uart.port.uartclk = clk_get_rate(data->clk);
+	}
+
+	data->pclk = devm_clk_get(&pdev->dev, "apb_pclk");
+	if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) {
+		err = -EPROBE_DEFER;
+		goto err_clk;
 	}
+	if (!IS_ERR(data->pclk)) {
+		err = clk_prepare_enable(data->pclk);
+		if (err) {
+			dev_err(&pdev->dev, "could not enable apb_pclk\n");
+			goto err_clk;
+		}
+	}
+
+	data->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(data->rst) && PTR_ERR(data->rst) == -EPROBE_DEFER) {
+		err = -EPROBE_DEFER;
+		goto err_pclk;
+	}
+	if (!IS_ERR(data->rst))
+		reset_control_deassert(data->rst);
 
 	data->dma.rx_chan_id = -1;
 	data->dma.tx_chan_id = -1;
@@ -422,18 +413,21 @@ static int dw8250_probe(struct platform_device *pdev)
 	if (pdev->dev.of_node) {
 		err = dw8250_probe_of(&uart.port, data);
 		if (err)
-			return err;
+			goto err_reset;
 	} else if (ACPI_HANDLE(&pdev->dev)) {
 		err = dw8250_probe_acpi(&uart, data);
 		if (err)
-			return err;
+			goto err_reset;
 	} else {
-		return -ENODEV;
+		err = -ENODEV;
+		goto err_reset;
 	}
 
 	data->line = serial8250_register_8250_port(&uart);
-	if (data->line < 0)
-		return data->line;
+	if (data->line < 0) {
+		err = data->line;
+		goto err_reset;
+	}
 
 	platform_set_drvdata(pdev, data);
 
@@ -441,6 +435,20 @@ static int dw8250_probe(struct platform_device *pdev)
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
+
+err_reset:
+	if (!IS_ERR(data->rst))
+		reset_control_assert(data->rst);
+
+err_pclk:
+	if (!IS_ERR(data->pclk))
+		clk_disable_unprepare(data->pclk);
+
+err_clk:
+	if (!IS_ERR(data->clk))
+		clk_disable_unprepare(data->clk);
+
+	return err;
 }
 
 static int dw8250_remove(struct platform_device *pdev)
@@ -451,6 +459,12 @@ static int dw8250_remove(struct platform_device *pdev)
 
 	serial8250_unregister_port(data->line);
 
+	if (!IS_ERR(data->rst))
+		reset_control_assert(data->rst);
+
+	if (!IS_ERR(data->pclk))
+		clk_disable_unprepare(data->pclk);
+
 	if (!IS_ERR(data->clk))
 		clk_disable_unprepare(data->clk);
 
@@ -488,6 +502,9 @@ static int dw8250_runtime_suspend(struct device *dev)
 	if (!IS_ERR(data->clk))
 		clk_disable_unprepare(data->clk);
 
+	if (!IS_ERR(data->pclk))
+		clk_disable_unprepare(data->pclk);
+
 	return 0;
 }
 
@@ -495,6 +512,9 @@ static int dw8250_runtime_resume(struct device *dev)
 {
 	struct dw8250_data *data = dev_get_drvdata(dev);
 
+	if (!IS_ERR(data->pclk))
+		clk_prepare_enable(data->pclk);
+
 	if (!IS_ERR(data->clk))
 		clk_prepare_enable(data->clk);
 
@@ -514,16 +534,12 @@ static const struct of_device_id dw8250_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, dw8250_of_match);
 
-static struct dw8250_acpi_desc byt_8250_desc = {
-	.set_termios = byt_set_termios,
-};
-
 static const struct acpi_device_id dw8250_acpi_match[] = {
 	{ "INT33C4", 0 },
 	{ "INT33C5", 0 },
 	{ "INT3434", 0 },
 	{ "INT3435", 0 },
-	{ "80860F0A", (kernel_ulong_t)&byt_8250_desc},
+	{ "80860F0A", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);
diff --git a/drivers/tty/serial/8250/8250_fsl.c b/drivers/tty/serial/8250/8250_fsl.c
index f4d3c47b88e8..c0533a57ec53 100644
--- a/drivers/tty/serial/8250/8250_fsl.c
+++ b/drivers/tty/serial/8250/8250_fsl.c
@@ -28,8 +28,7 @@ int fsl8250_handle_irq(struct uart_port *port)
 	unsigned char lsr, orig_lsr;
 	unsigned long flags;
 	unsigned int iir;
-	struct uart_8250_port *up =
-		container_of(port, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(port);
 
 	spin_lock_irqsave(&up->port.lock, flags);
 
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 33137b3ba94d..61830b1792eb 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1581,8 +1581,7 @@ static int skip_tx_en_setup(struct serial_private *priv,
 
 static void kt_handle_break(struct uart_port *p)
 {
-	struct uart_8250_port *up =
-		container_of(p, struct uart_8250_port, port);
+	struct uart_8250_port *up = up_to_u8250p(p);
 	/*
 	 * On receipt of a BI, serial device in Intel ME (Intel
 	 * management engine) needs to have its fifos cleared for sane
@@ -1593,8 +1592,7 @@ static void kt_handle_break(struct uart_port *p)
 
 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);
+	struct uart_8250_port *up = up_to_u8250p(p);
 	unsigned int val;
 
 	/*
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index fb57159bad3a..26cec64dadd7 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -238,7 +238,6 @@ config SERIAL_SAMSUNG_UARTS_4
 config SERIAL_SAMSUNG_UARTS
 	int
 	depends on PLAT_SAMSUNG
-	default 6 if CPU_S5P6450
 	default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
 	default 3
 	help
@@ -774,7 +773,7 @@ config SERIAL_HS_LPC32XX
 
 config SERIAL_HS_LPC32XX_CONSOLE
 	bool "Enable LPC32XX high speed UART serial console"
-	depends on SERIAL_HS_LPC32XX
+	depends on SERIAL_HS_LPC32XX=y
 	select SERIAL_CORE_CONSOLE
 	help
 	  If you would like to be able to use one of the high speed serial
@@ -1473,6 +1472,7 @@ config SERIAL_ARC_CONSOLE
 	bool "Console on ARC UART"
 	depends on SERIAL_ARC=y
 	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 	help
 	  Enable system Console on ARC UART
 
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 59b3da9bcc3f..d22e3d98ae23 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -109,10 +109,6 @@ static void altera_jtaguart_break_ctl(struct uart_port *port, int break_state)
 {
 }
 
-static void altera_jtaguart_enable_ms(struct uart_port *port)
-{
-}
-
 static void altera_jtaguart_set_termios(struct uart_port *port,
 					struct ktermios *termios,
 					struct ktermios *old)
@@ -291,7 +287,6 @@ static struct uart_ops altera_jtaguart_ops = {
 	.start_tx	= altera_jtaguart_start_tx,
 	.stop_tx	= altera_jtaguart_stop_tx,
 	.stop_rx	= altera_jtaguart_stop_rx,
-	.enable_ms	= altera_jtaguart_enable_ms,
 	.break_ctl	= altera_jtaguart_break_ctl,
 	.startup	= altera_jtaguart_startup,
 	.shutdown	= altera_jtaguart_shutdown,
@@ -309,9 +304,8 @@ static struct altera_jtaguart altera_jtaguart_ports[ALTERA_JTAGUART_MAXPORTS];
 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE)
 
 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
-static void altera_jtaguart_console_putc(struct console *co, const char c)
+static void altera_jtaguart_console_putc(struct uart_port *port, int c)
 {
-	struct uart_port *port = &(altera_jtaguart_ports + co->index)->port;
 	unsigned long status;
 	unsigned long flags;
 
@@ -330,9 +324,8 @@ static void altera_jtaguart_console_putc(struct console *co, const char c)
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 #else
-static void altera_jtaguart_console_putc(struct console *co, const char c)
+static void altera_jtaguart_console_putc(struct uart_port *port, int c)
 {
-	struct uart_port *port = &(altera_jtaguart_ports + co->index)->port;
 	unsigned long flags;
 
 	spin_lock_irqsave(&port->lock, flags);
@@ -350,11 +343,9 @@ static void altera_jtaguart_console_putc(struct console *co, const char c)
 static void altera_jtaguart_console_write(struct console *co, const char *s,
 					  unsigned int count)
 {
-	for (; count; count--, s++) {
-		altera_jtaguart_console_putc(co, *s);
-		if (*s == '\n')
-			altera_jtaguart_console_putc(co, '\r');
-	}
+	struct uart_port *port = &(altera_jtaguart_ports + co->index)->port;
+
+	uart_console_write(port, s, count, altera_jtaguart_console_putc);
 }
 
 static int __init altera_jtaguart_console_setup(struct console *co,
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 323376668b72..6a243239dbef 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -163,10 +163,6 @@ static void altera_uart_break_ctl(struct uart_port *port, int break_state)
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 
-static void altera_uart_enable_ms(struct uart_port *port)
-{
-}
-
 static void altera_uart_set_termios(struct uart_port *port,
 				    struct ktermios *termios,
 				    struct ktermios *old)
@@ -415,7 +411,6 @@ static struct uart_ops altera_uart_ops = {
 	.start_tx	= altera_uart_start_tx,
 	.stop_tx	= altera_uart_stop_tx,
 	.stop_rx	= altera_uart_stop_rx,
-	.enable_ms	= altera_uart_enable_ms,
 	.break_ctl	= altera_uart_break_ctl,
 	.startup	= altera_uart_startup,
 	.shutdown	= altera_uart_shutdown,
@@ -435,7 +430,7 @@ static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
 
 #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
 
-static void altera_uart_console_putc(struct uart_port *port, const char c)
+static void altera_uart_console_putc(struct uart_port *port, int c)
 {
 	while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 		 ALTERA_UART_STATUS_TRDY_MSK))
@@ -449,11 +444,7 @@ static void altera_uart_console_write(struct console *co, const char *s,
 {
 	struct uart_port *port = &(altera_uart_ports + co->index)->port;
 
-	for (; count; count--, s++) {
-		altera_uart_console_putc(port, *s);
-		if (*s == '\n')
-			altera_uart_console_putc(port, '\r');
-	}
+	uart_console_write(port, s, count, altera_uart_console_putc);
 }
 
 static int __init altera_uart_console_setup(struct console *co, char *options)
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index 971af1e22d0f..2064d31d0c8b 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -46,8 +46,7 @@
 #include <linux/amba/serial.h>
 #include <linux/clk.h>
 #include <linux/slab.h>
-
-#include <asm/io.h>
+#include <linux/io.h>
 
 #define UART_NR		8
 
@@ -688,28 +687,22 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
 		if (amba_ports[i] == NULL)
 			break;
 
-	if (i == ARRAY_SIZE(amba_ports)) {
-		ret = -EBUSY;
-		goto out;
-	}
+	if (i == ARRAY_SIZE(amba_ports))
+		return -EBUSY;
 
-	uap = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
-	if (!uap) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	uap = devm_kzalloc(&dev->dev, sizeof(struct uart_amba_port),
+			   GFP_KERNEL);
+	if (!uap)
+		return -ENOMEM;
 
-	base = ioremap(dev->res.start, resource_size(&dev->res));
-	if (!base) {
-		ret = -ENOMEM;
-		goto free;
-	}
+	base = devm_ioremap(&dev->dev, dev->res.start,
+			    resource_size(&dev->res));
+	if (!base)
+		return -ENOMEM;
 
-	uap->clk = clk_get(&dev->dev, NULL);
-	if (IS_ERR(uap->clk)) {
-		ret = PTR_ERR(uap->clk);
-		goto unmap;
-	}
+	uap->clk = devm_clk_get(&dev->dev, NULL);
+	if (IS_ERR(uap->clk))
+		return PTR_ERR(uap->clk);
 
 	uap->port.dev = &dev->dev;
 	uap->port.mapbase = dev->res.start;
@@ -727,15 +720,9 @@ static int pl010_probe(struct amba_device *dev, const struct amba_id *id)
 
 	amba_set_drvdata(dev, uap);
 	ret = uart_add_one_port(&amba_reg, &uap->port);
-	if (ret) {
+	if (ret)
 		amba_ports[i] = NULL;
-		clk_put(uap->clk);
- unmap:
-		iounmap(base);
- free:
-		kfree(uap);
-	}
- out:
+
 	return ret;
 }
 
@@ -750,9 +737,6 @@ static int pl010_remove(struct amba_device *dev)
 		if (amba_ports[i] == uap)
 			amba_ports[i] = NULL;
 
-	iounmap(uap->port.membase);
-	clk_put(uap->clk);
-	kfree(uap);
 	return 0;
 }
 
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 0e26dcbd5ea4..8572f2a57fc8 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1484,7 +1484,7 @@ static int pl011_hwinit(struct uart_port *port)
 	 */
 	retval = clk_prepare_enable(uap->clk);
 	if (retval)
-		goto out;
+		return retval;
 
 	uap->port.uartclk = clk_get_rate(uap->clk);
 
@@ -1507,8 +1507,6 @@ static int pl011_hwinit(struct uart_port *port)
 			plat->init();
 	}
 	return 0;
- out:
-	return retval;
 }
 
 static void pl011_write_lcr_h(struct uart_amba_port *uap, unsigned int lcr_h)
@@ -2131,32 +2129,24 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
 		if (amba_ports[i] == NULL)
 			break;
 
-	if (i == ARRAY_SIZE(amba_ports)) {
-		ret = -EBUSY;
-		goto out;
-	}
+	if (i == ARRAY_SIZE(amba_ports))
+		return -EBUSY;
 
 	uap = devm_kzalloc(&dev->dev, sizeof(struct uart_amba_port),
 			   GFP_KERNEL);
-	if (uap == NULL) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	if (uap == NULL)
+		return -ENOMEM;
 
 	i = pl011_probe_dt_alias(i, &dev->dev);
 
 	base = devm_ioremap(&dev->dev, dev->res.start,
 			    resource_size(&dev->res));
-	if (!base) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	if (!base)
+		return -ENOMEM;
 
 	uap->clk = devm_clk_get(&dev->dev, NULL);
-	if (IS_ERR(uap->clk)) {
-		ret = PTR_ERR(uap->clk);
-		goto out;
-	}
+	if (IS_ERR(uap->clk))
+		return PTR_ERR(uap->clk);
 
 	uap->vendor = vendor;
 	uap->lcrh_rx = vendor->lcrh_rx;
@@ -2198,7 +2188,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
 		uart_unregister_driver(&amba_reg);
 		pl011_dma_remove(uap);
 	}
- out:
+
 	return ret;
 }
 
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index de11ab8ffd91..a34a0cec1685 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -71,11 +71,6 @@ static void apbuart_stop_rx(struct uart_port *port)
 	UART_PUT_CTRL(port, cr);
 }
 
-static void apbuart_enable_ms(struct uart_port *port)
-{
-	/* No modem status change interrupts for APBUART */
-}
-
 static void apbuart_rx_chars(struct uart_port *port)
 {
 	unsigned int status, ch, rsr, flag;
@@ -337,7 +332,6 @@ static struct uart_ops grlib_apbuart_ops = {
 	.stop_tx = apbuart_stop_tx,
 	.start_tx = apbuart_start_tx,
 	.stop_rx = apbuart_stop_rx,
-	.enable_ms = apbuart_enable_ms,
 	.break_ctl = apbuart_break_ctl,
 	.startup = apbuart_startup,
 	.shutdown = apbuart_shutdown,
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index acd03af7cd52..0be1c45efd65 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -176,10 +176,6 @@ static void ar933x_uart_break_ctl(struct uart_port *port, int break_state)
 	spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
-static void ar933x_uart_enable_ms(struct uart_port *port)
-{
-}
-
 /*
  * baudrate = (clk / (scale + 1)) * (step * (1 / 2^17))
  */
@@ -495,7 +491,6 @@ static struct uart_ops ar933x_uart_ops = {
 	.stop_tx	= ar933x_uart_stop_tx,
 	.start_tx	= ar933x_uart_start_tx,
 	.stop_rx	= ar933x_uart_stop_rx,
-	.enable_ms	= ar933x_uart_enable_ms,
 	.break_ctl	= ar933x_uart_break_ctl,
 	.startup	= ar933x_uart_startup,
 	.shutdown	= ar933x_uart_shutdown,
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 008c223eaf26..a59d1d77e750 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -37,8 +37,8 @@
 #include <linux/tty_flip.h>
 #include <linux/serial_core.h>
 #include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
 
 /*************************************
  * ARC UART Hardware Specs
@@ -72,7 +72,7 @@
 #define RXOERR  0x02	/* OverFlow Err: Char recv but RXFULL still set */
 
 /* Uart bit fiddling helpers: lowest level */
-#define RBASE(uart, reg)      (uart->port.membase + reg)
+#define RBASE(port, reg)      (port->membase + reg)
 #define UART_REG_SET(u, r, v) writeb((v), RBASE(u, r))
 #define UART_REG_GET(u, r)    readb(RBASE(u, r))
 
@@ -102,7 +102,6 @@
 struct arc_uart_port {
 	struct uart_port port;
 	unsigned long baud;
-	int is_emulated;	/* H/w vs. Instruction Set Simulator */
 };
 
 #define to_arc_port(uport)  container_of(uport, struct arc_uart_port, port)
@@ -129,19 +128,15 @@ static struct uart_driver arc_uart_driver = {
 
 static void arc_serial_stop_rx(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-
-	UART_RX_IRQ_DISABLE(uart);
+	UART_RX_IRQ_DISABLE(port);
 }
 
 static void arc_serial_stop_tx(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-
-	while (!(UART_GET_STATUS(uart) & TXEMPTY))
+	while (!(UART_GET_STATUS(port) & TXEMPTY))
 		cpu_relax();
 
-	UART_TX_IRQ_DISABLE(uart);
+	UART_TX_IRQ_DISABLE(port);
 }
 
 /*
@@ -149,10 +144,9 @@ static void arc_serial_stop_tx(struct uart_port *port)
  */
 static unsigned int arc_serial_tx_empty(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
 	unsigned int stat;
 
-	stat = UART_GET_STATUS(uart);
+	stat = UART_GET_STATUS(port);
 	if (stat & TXEMPTY)
 		return TIOCSER_TEMT;
 
@@ -166,24 +160,24 @@ static unsigned int arc_serial_tx_empty(struct uart_port *port)
  *     = by uart_start( ) before calling us
  *     = tx_ist checks that too before calling
  */
-static void arc_serial_tx_chars(struct arc_uart_port *uart)
+static void arc_serial_tx_chars(struct uart_port *port)
 {
-	struct circ_buf *xmit = &uart->port.state->xmit;
+	struct circ_buf *xmit = &port->state->xmit;
 	int sent = 0;
 	unsigned char ch;
 
-	if (unlikely(uart->port.x_char)) {
-		UART_SET_DATA(uart, uart->port.x_char);
-		uart->port.icount.tx++;
-		uart->port.x_char = 0;
+	if (unlikely(port->x_char)) {
+		UART_SET_DATA(port, port->x_char);
+		port->icount.tx++;
+		port->x_char = 0;
 		sent = 1;
 	} else if (!uart_circ_empty(xmit)) {
 		ch = xmit->buf[xmit->tail];
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		uart->port.icount.tx++;
-		while (!(UART_GET_STATUS(uart) & TXEMPTY))
+		port->icount.tx++;
+		while (!(UART_GET_STATUS(port) & TXEMPTY))
 			cpu_relax();
-		UART_SET_DATA(uart, ch);
+		UART_SET_DATA(port, ch);
 		sent = 1;
 	}
 
@@ -192,10 +186,10 @@ static void arc_serial_tx_chars(struct arc_uart_port *uart)
 	 * By Hard ISR to schedule processing in software interrupt part
 	 */
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(&uart->port);
+		uart_write_wakeup(port);
 
 	if (sent)
-		UART_TX_IRQ_ENABLE(uart);
+		UART_TX_IRQ_ENABLE(port);
 }
 
 /*
@@ -204,12 +198,10 @@ static void arc_serial_tx_chars(struct arc_uart_port *uart)
  */
 static void arc_serial_start_tx(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-
-	arc_serial_tx_chars(uart);
+	arc_serial_tx_chars(port);
 }
 
-static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
+static void arc_serial_rx_chars(struct uart_port *port, unsigned int status)
 {
 	unsigned int ch, flg = 0;
 
@@ -229,15 +221,15 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
 		 */
 		if (unlikely(status & (RXOERR | RXFERR))) {
 			if (status & RXOERR) {
-				uart->port.icount.overrun++;
+				port->icount.overrun++;
 				flg = TTY_OVERRUN;
-				UART_CLR_STATUS(uart, RXOERR);
+				UART_CLR_STATUS(port, RXOERR);
 			}
 
 			if (status & RXFERR) {
-				uart->port.icount.frame++;
+				port->icount.frame++;
 				flg = TTY_FRAME;
-				UART_CLR_STATUS(uart, RXFERR);
+				UART_CLR_STATUS(port, RXFERR);
 			}
 		} else
 			flg = TTY_NORMAL;
@@ -245,16 +237,16 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
 		if (status & RXEMPTY)
 			continue;
 
-		ch = UART_GET_DATA(uart);
-		uart->port.icount.rx++;
+		ch = UART_GET_DATA(port);
+		port->icount.rx++;
 
-		if (!(uart_handle_sysrq_char(&uart->port, ch)))
-			uart_insert_char(&uart->port, status, RXOERR, ch, flg);
+		if (!(uart_handle_sysrq_char(port, ch)))
+			uart_insert_char(port, status, RXOERR, ch, flg);
 
-		spin_unlock(&uart->port.lock);
-		tty_flip_buffer_push(&uart->port.state->port);
-		spin_lock(&uart->port.lock);
-	} while (!((status = UART_GET_STATUS(uart)) & RXEMPTY));
+		spin_unlock(&port->lock);
+		tty_flip_buffer_push(&port->state->port);
+		spin_lock(&port->lock);
+	} while (!((status = UART_GET_STATUS(port)) & RXEMPTY));
 }
 
 /*
@@ -287,10 +279,10 @@ static void arc_serial_rx_chars(struct arc_uart_port *uart, unsigned int status)
 
 static irqreturn_t arc_serial_isr(int irq, void *dev_id)
 {
-	struct arc_uart_port *uart = dev_id;
+	struct uart_port *port = dev_id;
 	unsigned int status;
 
-	status = UART_GET_STATUS(uart);
+	status = UART_GET_STATUS(port);
 
 	/*
 	 * Single IRQ for both Rx (data available) Tx (room available) Interrupt
@@ -300,9 +292,9 @@ static irqreturn_t arc_serial_isr(int irq, void *dev_id)
 	if (status & RXIENB) {
 
 		/* already in ISR, no need of xx_irqsave */
-		spin_lock(&uart->port.lock);
-		arc_serial_rx_chars(uart, status);
-		spin_unlock(&uart->port.lock);
+		spin_lock(&port->lock);
+		arc_serial_rx_chars(port, status);
+		spin_unlock(&port->lock);
 	}
 
 	if ((status & TXIENB) && (status & TXEMPTY)) {
@@ -310,14 +302,14 @@ static irqreturn_t arc_serial_isr(int irq, void *dev_id)
 		/* Unconditionally disable further Tx-Interrupts.
 		 * will be enabled by tx_chars() if needed.
 		 */
-		UART_TX_IRQ_DISABLE(uart);
+		UART_TX_IRQ_DISABLE(port);
 
-		spin_lock(&uart->port.lock);
+		spin_lock(&port->lock);
 
-		if (!uart_tx_stopped(&uart->port))
-			arc_serial_tx_chars(uart);
+		if (!uart_tx_stopped(port))
+			arc_serial_tx_chars(port);
 
-		spin_unlock(&uart->port.lock);
+		spin_unlock(&port->lock);
 	}
 
 	return IRQ_HANDLED;
@@ -340,13 +332,6 @@ static void arc_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	/* MCR not present */
 }
 
-/* Enable Modem Status Interrupts */
-
-static void arc_serial_enable_ms(struct uart_port *port)
-{
-	/* MSR not present */
-}
-
 static void arc_serial_break_ctl(struct uart_port *port, int break_state)
 {
 	/* ARC UART doesn't support sending Break signal */
@@ -354,18 +339,15 @@ static void arc_serial_break_ctl(struct uart_port *port, int break_state)
 
 static int arc_serial_startup(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-
 	/* Before we hook up the ISR, Disable all UART Interrupts */
-	UART_ALL_IRQ_DISABLE(uart);
+	UART_ALL_IRQ_DISABLE(port);
 
-	if (request_irq(uart->port.irq, arc_serial_isr, 0, "arc uart rx-tx",
-			uart)) {
-		dev_warn(uart->port.dev, "Unable to attach ARC UART intr\n");
+	if (request_irq(port->irq, arc_serial_isr, 0, "arc uart rx-tx", port)) {
+		dev_warn(port->dev, "Unable to attach ARC UART intr\n");
 		return -EBUSY;
 	}
 
-	UART_RX_IRQ_ENABLE(uart); /* Only Rx IRQ enabled to begin with */
+	UART_RX_IRQ_ENABLE(port); /* Only Rx IRQ enabled to begin with */
 
 	return 0;
 }
@@ -373,8 +355,7 @@ static int arc_serial_startup(struct uart_port *port)
 /* This is not really needed */
 static void arc_serial_shutdown(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-	free_irq(uart->port.irq, uart);
+	free_irq(port->irq, port);
 }
 
 static void
@@ -398,25 +379,14 @@ arc_serial_set_termios(struct uart_port *port, struct ktermios *new,
 	uartl = hw_val & 0xFF;
 	uarth = (hw_val >> 8) & 0xFF;
 
-	/*
-	 * UART ISS(Instruction Set simulator) emulation has a subtle bug:
-	 * A existing value of Baudh = 0 is used as a indication to startup
-	 * it's internal state machine.
-	 * Thus if baudh is set to 0, 2 times, it chokes.
-	 * This happens with BAUD=115200 and the formaula above
-	 * Until that is fixed, when running on ISS, we will set baudh to !0
-	 */
-	if (uart->is_emulated)
-		uarth = 1;
-
 	spin_lock_irqsave(&port->lock, flags);
 
-	UART_ALL_IRQ_DISABLE(uart);
+	UART_ALL_IRQ_DISABLE(port);
 
-	UART_SET_BAUDL(uart, uartl);
-	UART_SET_BAUDH(uart, uarth);
+	UART_SET_BAUDL(port, uartl);
+	UART_SET_BAUDH(port, uarth);
 
-	UART_RX_IRQ_ENABLE(uart);
+	UART_RX_IRQ_ENABLE(port);
 
 	/*
 	 * UART doesn't support Parity/Hardware Flow Control;
@@ -439,9 +409,7 @@ arc_serial_set_termios(struct uart_port *port, struct ktermios *new,
 
 static const char *arc_serial_type(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-
-	return uart->port.type == PORT_ARC ? DRIVER_NAME : NULL;
+	return port->type == PORT_ARC ? DRIVER_NAME : NULL;
 }
 
 static void arc_serial_release_port(struct uart_port *port)
@@ -470,35 +438,28 @@ arc_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
  */
 static void arc_serial_config_port(struct uart_port *port, int flags)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-
 	if (flags & UART_CONFIG_TYPE)
-		uart->port.type = PORT_ARC;
+		port->type = PORT_ARC;
 }
 
-#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_ARC_CONSOLE)
+#ifdef CONFIG_CONSOLE_POLL
 
 static void arc_serial_poll_putchar(struct uart_port *port, unsigned char chr)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
-
-	while (!(UART_GET_STATUS(uart) & TXEMPTY))
+	while (!(UART_GET_STATUS(port) & TXEMPTY))
 		cpu_relax();
 
-	UART_SET_DATA(uart, chr);
+	UART_SET_DATA(port, chr);
 }
-#endif
 
-#ifdef CONFIG_CONSOLE_POLL
 static int arc_serial_poll_getchar(struct uart_port *port)
 {
-	struct arc_uart_port *uart = to_arc_port(port);
 	unsigned char chr;
 
-	while (!(UART_GET_STATUS(uart) & RXEMPTY))
+	while (!(UART_GET_STATUS(port) & RXEMPTY))
 		cpu_relax();
 
-	chr = UART_GET_DATA(uart);
+	chr = UART_GET_DATA(port);
 	return chr;
 }
 #endif
@@ -510,7 +471,6 @@ static struct uart_ops arc_serial_pops = {
 	.stop_tx	= arc_serial_stop_tx,
 	.start_tx	= arc_serial_start_tx,
 	.stop_rx	= arc_serial_stop_rx,
-	.enable_ms	= arc_serial_enable_ms,
 	.break_ctl	= arc_serial_break_ctl,
 	.startup	= arc_serial_startup,
 	.shutdown	= arc_serial_shutdown,
@@ -526,71 +486,6 @@ static struct uart_ops arc_serial_pops = {
 #endif
 };
 
-static int
-arc_uart_init_one(struct platform_device *pdev, int dev_id)
-{
-	struct resource *res, *res2;
-	unsigned long *plat_data;
-	struct arc_uart_port *uart = &arc_uart_ports[dev_id];
-
-	plat_data = dev_get_platdata(&pdev->dev);
-	if (!plat_data)
-		return -ENODEV;
-
-	uart->is_emulated = !!plat_data[0];	/* workaround ISS bug */
-
-	if (is_early_platform_device(pdev)) {
-		uart->port.uartclk = plat_data[1];
-		uart->baud = plat_data[2];
-	} else {
-		struct device_node *np = pdev->dev.of_node;
-		u32 val;
-
-		if (of_property_read_u32(np, "clock-frequency", &val)) {
-			dev_err(&pdev->dev, "clock-frequency property NOTset\n");
-			return -EINVAL;
-		}
-		uart->port.uartclk = val;
-
-		if (of_property_read_u32(np, "current-speed", &val)) {
-			dev_err(&pdev->dev, "current-speed property NOT set\n");
-			return -EINVAL;
-		}
-		uart->baud = val;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
-	res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res2)
-		return -ENODEV;
-
-	uart->port.mapbase = res->start;
-	uart->port.membase = ioremap_nocache(res->start, resource_size(res));
-	if (!uart->port.membase)
-		/* No point of dev_err since UART itself is hosed here */
-		return -ENXIO;
-
-	uart->port.irq = res2->start;
-	uart->port.dev = &pdev->dev;
-	uart->port.iotype = UPIO_MEM;
-	uart->port.flags = UPF_BOOT_AUTOCONF;
-	uart->port.line = dev_id;
-	uart->port.ops = &arc_serial_pops;
-
-	uart->port.fifosize = ARC_UART_TX_FIFO_SIZE;
-
-	/*
-	 * uart_insert_char( ) uses it in decideding whether to ignore a
-	 * char or not. Explicitly setting it here, removes the subtelty
-	 */
-	uart->port.ignore_status_mask = 0;
-
-	return 0;
-}
-
 #ifdef CONFIG_SERIAL_ARC_CONSOLE
 
 static int arc_serial_console_setup(struct console *co, char *options)
@@ -624,7 +519,10 @@ static int arc_serial_console_setup(struct console *co, char *options)
 
 static void arc_serial_console_putchar(struct uart_port *port, int ch)
 {
-	arc_serial_poll_putchar(port, (unsigned char)ch);
+	while (!(UART_GET_STATUS(port) & TXEMPTY))
+		cpu_relax();
+
+	UART_SET_DATA(port, (unsigned char)ch);
 }
 
 /*
@@ -651,48 +549,45 @@ static struct console arc_console = {
 	.data	= &arc_uart_driver
 };
 
-static __init void early_serial_write(struct console *con, const char *s,
-					unsigned int n)
+static __init void arc_early_serial_write(struct console *con, const char *s,
+					  unsigned int n)
 {
-	struct uart_port *port = &arc_uart_ports[con->index].port;
-	unsigned int i;
+	struct earlycon_device *dev = con->data;
 
-	for (i = 0; i < n; i++, s++) {
-		if (*s == '\n')
-			arc_serial_poll_putchar(port, '\r');
-		arc_serial_poll_putchar(port, *s);
-	}
+	uart_console_write(&dev->port, s, n, arc_serial_console_putchar);
 }
 
-static struct console arc_early_serial_console __initdata = {
-	.name = "early_ARCuart",
-	.write = early_serial_write,
-	.flags = CON_PRINTBUFFER | CON_BOOT,
-	.index = -1
-};
-
-static int __init arc_serial_probe_earlyprintk(struct platform_device *pdev)
+static int __init arc_early_console_setup(struct earlycon_device *dev,
+					  const char *opt)
 {
-	int dev_id = pdev->id < 0 ? 0 : pdev->id;
-	int rc;
+	struct uart_port *port = &dev->port;
+	unsigned int l, h, hw_val;
 
-	arc_early_serial_console.index = dev_id;
+	if (!dev->port.membase)
+		return -ENODEV;
 
-	rc = arc_uart_init_one(pdev, dev_id);
-	if (rc)
-		panic("early console init failed\n");
+	hw_val = port->uartclk / (dev->baud * 4) - 1;
+	l = hw_val & 0xFF;
+	h = (hw_val >> 8) & 0xFF;
 
-	arc_serial_console_setup(&arc_early_serial_console, NULL);
+	UART_SET_BAUDL(port, l);
+	UART_SET_BAUDH(port, h);
 
-	register_console(&arc_early_serial_console);
+	dev->con->write = arc_early_serial_write;
 	return 0;
 }
+EARLYCON_DECLARE(arc_uart, arc_early_console_setup);
+OF_EARLYCON_DECLARE(arc_uart, "snps,arc-uart", arc_early_console_setup);
+
 #endif	/* CONFIG_SERIAL_ARC_CONSOLE */
 
 static int arc_serial_probe(struct platform_device *pdev)
 {
-	int rc, dev_id;
 	struct device_node *np = pdev->dev.of_node;
+	struct arc_uart_port *uart;
+	struct uart_port *port;
+	int dev_id;
+	u32 val;
 
 	/* no device tree device */
 	if (!np)
@@ -702,12 +597,43 @@ static int arc_serial_probe(struct platform_device *pdev)
 	if (dev_id < 0)
 		dev_id = 0;
 
-	rc = arc_uart_init_one(pdev, dev_id);
-	if (rc)
-		return rc;
+	uart = &arc_uart_ports[dev_id];
+	port = &uart->port;
+
+	if (of_property_read_u32(np, "clock-frequency", &val)) {
+		dev_err(&pdev->dev, "clock-frequency property NOTset\n");
+		return -EINVAL;
+	}
+	port->uartclk = val;
+
+	if (of_property_read_u32(np, "current-speed", &val)) {
+		dev_err(&pdev->dev, "current-speed property NOT set\n");
+		return -EINVAL;
+	}
+	uart->baud = val;
+
+	port->membase = of_iomap(np, 0);
+	if (!port->membase)
+		/* No point of dev_err since UART itself is hosed here */
+		return -ENXIO;
+
+	port->irq = irq_of_parse_and_map(np, 0);
 
-	rc = uart_add_one_port(&arc_uart_driver, &arc_uart_ports[dev_id].port);
-	return rc;
+	port->dev = &pdev->dev;
+	port->iotype = UPIO_MEM;
+	port->flags = UPF_BOOT_AUTOCONF;
+	port->line = dev_id;
+	port->ops = &arc_serial_pops;
+
+	port->fifosize = ARC_UART_TX_FIFO_SIZE;
+
+	/*
+	 * uart_insert_char( ) uses it in decideding whether to ignore a
+	 * char or not. Explicitly setting it here, removes the subtelty
+	 */
+	port->ignore_status_mask = 0;
+
+	return uart_add_one_port(&arc_uart_driver, &arc_uart_ports[dev_id].port);
 }
 
 static int arc_serial_remove(struct platform_device *pdev)
@@ -732,27 +658,6 @@ static struct platform_driver arc_platform_driver = {
 	 },
 };
 
-#ifdef CONFIG_SERIAL_ARC_CONSOLE
-
-static struct platform_driver early_arc_platform_driver __initdata = {
-	.probe = arc_serial_probe_earlyprintk,
-	.remove = arc_serial_remove,
-	.driver = {
-		.name = DRIVER_NAME,
-		.owner = THIS_MODULE,
-	 },
-};
-/*
- * Register an early platform driver of "earlyprintk" class.
- * ARCH platform code installs the driver and probes the early devices
- * The installation could rely on user specifying earlyprintk=xyx in cmd line
- * or it could be done independently, for all "earlyprintk" class drivers.
- * [see arch/arc/plat-arcfpga/platform.c]
- */
-early_platform_init("earlyprintk", &early_arc_platform_driver);
-
-#endif  /* CONFIG_SERIAL_ARC_CONSOLE */
-
 static int __init arc_serial_init(void)
 {
 	int ret;
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index c4f750314100..7b63677475c1 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -706,7 +706,7 @@ static void atmel_release_tx_dma(struct uart_port *port)
 		dmaengine_terminate_all(chan);
 		dma_release_channel(chan);
 		dma_unmap_sg(port->dev, &atmel_port->sg_tx, 1,
-				DMA_MEM_TO_DEV);
+				DMA_TO_DEVICE);
 	}
 
 	atmel_port->desc_tx = NULL;
@@ -804,7 +804,7 @@ static int atmel_prepare_tx_dma(struct uart_port *port)
 	nent = dma_map_sg(port->dev,
 				&atmel_port->sg_tx,
 				1,
-				DMA_MEM_TO_DEV);
+				DMA_TO_DEVICE);
 
 	if (!nent) {
 		dev_dbg(port->dev, "need to release resource of dma\n");
@@ -883,7 +883,7 @@ static void atmel_release_rx_dma(struct uart_port *port)
 		dmaengine_terminate_all(chan);
 		dma_release_channel(chan);
 		dma_unmap_sg(port->dev, &atmel_port->sg_rx, 1,
-				DMA_DEV_TO_MEM);
+				DMA_FROM_DEVICE);
 	}
 
 	atmel_port->desc_rx = NULL;
@@ -968,7 +968,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
 			nent = dma_map_sg(port->dev,
 					&atmel_port->sg_rx,
 					1,
-					DMA_DEV_TO_MEM);
+					DMA_FROM_DEVICE);
 
 	if (!nent) {
 		dev_dbg(port->dev, "need to release resource of dma\n");
diff --git a/drivers/tty/serial/bfin_sport_uart.c b/drivers/tty/serial/bfin_sport_uart.c
index 4f229703328b..7810aa290edf 100644
--- a/drivers/tty/serial/bfin_sport_uart.c
+++ b/drivers/tty/serial/bfin_sport_uart.c
@@ -426,11 +426,6 @@ static void sport_stop_rx(struct uart_port *port)
 	SSYNC();
 }
 
-static void sport_enable_ms(struct uart_port *port)
-{
-	pr_debug("%s enter\n", __func__);
-}
-
 static void sport_break_ctl(struct uart_port *port, int break_state)
 {
 	pr_debug("%s enter\n", __func__);
@@ -500,6 +495,13 @@ static void sport_set_termios(struct uart_port *port,
 
 	pr_debug("%s enter, c_cflag:%08x\n", __func__, termios->c_cflag);
 
+#ifdef CONFIG_SERIAL_BFIN_SPORT_CTSRTS
+	if (old == NULL && up->cts_pin != -1)
+		termios->c_cflag |= CRTSCTS;
+	else if (up->cts_pin == -1)
+		termios->c_cflag &= ~CRTSCTS;
+#endif
+
 	switch (termios->c_cflag & CSIZE) {
 	case CS8:
 		up->csize = 8;
@@ -587,7 +589,6 @@ struct uart_ops sport_uart_ops = {
 	.stop_tx	= sport_stop_tx,
 	.start_tx	= sport_start_tx,
 	.stop_rx	= sport_stop_rx,
-	.enable_ms	= sport_enable_ms,
 	.break_ctl	= sport_break_ctl,
 	.startup	= sport_startup,
 	.shutdown	= sport_shutdown,
@@ -813,10 +814,8 @@ static int sport_uart_probe(struct platform_device *pdev)
 		res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 		if (res == NULL)
 			sport->cts_pin = -1;
-		else {
+		else
 			sport->cts_pin = res->start;
-			sport->port.flags |= ASYNC_CTS_FLOW;
-		}
 
 		res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 		if (res == NULL)
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index ac86a20992e9..dec0fd725d80 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -200,14 +200,6 @@ static void bfin_serial_stop_rx(struct uart_port *port)
 	UART_CLEAR_IER(uart, ERBFI);
 }
 
-/*
- * Set the modem control timer to fire immediately.
- */
-static void bfin_serial_enable_ms(struct uart_port *port)
-{
-}
-
-
 #if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
 # define UART_GET_ANOMALY_THRESHOLD(uart)    ((uart)->anomaly_threshold)
 # define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
@@ -793,6 +785,13 @@ bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned int ier, lcr = 0;
 	unsigned long timeout;
 
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
+	if (old == NULL && uart->cts_pin != -1)
+		termios->c_cflag |= CRTSCTS;
+	else if (uart->cts_pin == -1)
+		termios->c_cflag &= ~CRTSCTS;
+#endif
+
 	switch (termios->c_cflag & CSIZE) {
 	case CS8:
 		lcr = WLS(8);
@@ -1014,7 +1013,6 @@ static struct uart_ops bfin_serial_pops = {
 	.stop_tx	= bfin_serial_stop_tx,
 	.start_tx	= bfin_serial_start_tx,
 	.stop_rx	= bfin_serial_stop_rx,
-	.enable_ms	= bfin_serial_enable_ms,
 	.break_ctl	= bfin_serial_break_ctl,
 	.startup	= bfin_serial_startup,
 	.shutdown	= bfin_serial_shutdown,
@@ -1325,12 +1323,8 @@ static int bfin_serial_probe(struct platform_device *pdev)
 		res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 		if (res == NULL)
 			uart->cts_pin = -1;
-		else {
+		else
 			uart->cts_pin = res->start;
-#ifdef CONFIG_SERIAL_BFIN_CTSRTS
-			uart->port.flags |= ASYNC_CTS_FLOW;
-#endif
-		}
 
 		res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 		if (res == NULL)
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index 14aaea0d4131..f5b4c3d7e38f 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -352,7 +352,6 @@ static const struct uart_ops uart_clps711x_ops = {
 	.stop_tx	= uart_clps711x_stop_tx,
 	.start_tx	= uart_clps711x_start_tx,
 	.stop_rx	= uart_clps711x_nop_void,
-	.enable_ms	= uart_clps711x_nop_void,
 	.break_ctl	= uart_clps711x_break_ctl,
 	.set_ldisc	= uart_clps711x_set_ldisc,
 	.startup	= uart_clps711x_startup,
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index aa60e6d13eca..533852eb8778 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -202,14 +202,6 @@ static void cpm_uart_stop_rx(struct uart_port *port)
 }
 
 /*
- * Enable Modem status interrupts
- */
-static void cpm_uart_enable_ms(struct uart_port *port)
-{
-	pr_debug("CPM uart[%d]:enable ms\n", port->line);
-}
-
-/*
  * Generate a break.
  */
 static void cpm_uart_break_ctl(struct uart_port *port, int break_state)
@@ -1122,7 +1114,6 @@ static struct uart_ops cpm_uart_pops = {
 	.stop_tx	= cpm_uart_stop_tx,
 	.start_tx	= cpm_uart_start_tx,
 	.stop_rx	= cpm_uart_stop_rx,
-	.enable_ms	= cpm_uart_enable_ms,
 	.break_ctl	= cpm_uart_break_ctl,
 	.startup	= cpm_uart_startup,
 	.shutdown	= cpm_uart_shutdown,
diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c
index d567ac5d3af4..58e6f61a87e4 100644
--- a/drivers/tty/serial/crisv10.c
+++ b/drivers/tty/serial/crisv10.c
@@ -3831,14 +3831,13 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 	DECLARE_WAITQUEUE(wait, current);
 	unsigned long	flags;
 	int		retval;
-	int		do_clocal = 0, extra_count = 0;
+	int		do_clocal = 0;
 
 	/*
 	 * If the device is in the middle of being closed, then block
 	 * until it's done, and then try again.
 	 */
-	if (tty_hung_up_p(filp) ||
-	    (info->port.flags & ASYNC_CLOSING)) {
+	if (info->port.flags & ASYNC_CLOSING) {
 		wait_event_interruptible_tty(tty, info->port.close_wait,
 			!(info->port.flags & ASYNC_CLOSING));
 #ifdef SERIAL_DO_RESTART
@@ -3879,10 +3878,7 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 	       info->line, info->port.count);
 #endif
 	local_irq_save(flags);
-	if (!tty_hung_up_p(filp)) {
-		extra_count++;
-		info->port.count--;
-	}
+	info->port.count--;
 	local_irq_restore(flags);
 	info->port.blocked_open++;
 	while (1) {
@@ -3921,7 +3917,7 @@ block_til_ready(struct tty_struct *tty, struct file * filp,
 	}
 	set_current_state(TASK_RUNNING);
 	remove_wait_queue(&info->port.open_wait, &wait);
-	if (extra_count)
+	if (!tty_hung_up_p(filp))
 		info->port.count++;
 	info->port.blocked_open--;
 #ifdef SERIAL_DEBUG_OPEN
@@ -3976,8 +3972,7 @@ rs_open(struct tty_struct *tty, struct file * filp)
 	/*
 	 * If the port is in the middle of closing, bail out now
 	 */
-	if (tty_hung_up_p(filp) ||
-	    (info->port.flags & ASYNC_CLOSING)) {
+	if (info->port.flags & ASYNC_CLOSING) {
 		wait_event_interruptible_tty(tty, info->port.close_wait,
 			!(info->port.flags & ASYNC_CLOSING));
 #ifdef SERIAL_DO_RESTART
diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
index cdbbc788230a..c121f16a973f 100644
--- a/drivers/tty/serial/dz.c
+++ b/drivers/tty/serial/dz.c
@@ -151,11 +151,6 @@ static void dz_stop_rx(struct uart_port *uport)
 	dz_out(dport, DZ_LPR, dport->cflag);
 }
 
-static void dz_enable_ms(struct uart_port *uport)
-{
-	/* nothing to do */
-}
-
 /*
  * ------------------------------------------------------------
  *
@@ -751,7 +746,6 @@ static struct uart_ops dz_ops = {
 	.stop_tx	= dz_stop_tx,
 	.start_tx	= dz_start_tx,
 	.stop_rx	= dz_stop_rx,
-	.enable_ms	= dz_enable_ms,
 	.break_ctl	= dz_break_ctl,
 	.startup	= dz_startup,
 	.shutdown	= dz_shutdown,
diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c
index 3b0ee9afd76f..55d9c00112cc 100644
--- a/drivers/tty/serial/efm32-uart.c
+++ b/drivers/tty/serial/efm32-uart.c
@@ -185,11 +185,6 @@ static void efm32_uart_stop_rx(struct uart_port *port)
 	efm32_uart_write32(efm_port, UARTn_CMD_RXDIS, UARTn_CMD);
 }
 
-static void efm32_uart_enable_ms(struct uart_port *port)
-{
-	/* no handshake lines, no modem status interrupts */
-}
-
 static void efm32_uart_break_ctl(struct uart_port *port, int ctl)
 {
 	/* not possible without fiddling with gpios */
@@ -499,7 +494,6 @@ static struct uart_ops efm32_uart_pops = {
 	.stop_tx = efm32_uart_stop_tx,
 	.start_tx = efm32_uart_start_tx,
 	.stop_rx = efm32_uart_stop_rx,
-	.enable_ms = efm32_uart_enable_ms,
 	.break_ctl = efm32_uart_break_ctl,
 	.startup = efm32_uart_startup,
 	.shutdown = efm32_uart_shutdown,
@@ -671,10 +665,16 @@ static int efm32_uart_probe_dt(struct platform_device *pdev,
 	if (!np)
 		return 1;
 
-	ret = of_property_read_u32(np, "efm32,location", &location);
+	ret = of_property_read_u32(np, "energymicro,location", &location);
+
+	if (ret)
+		/* fall back to wrongly namespaced property */
+		ret = of_property_read_u32(np, "efm32,location", &location);
+
 	if (ret)
 		/* fall back to old and (wrongly) generic property "location" */
 		ret = of_property_read_u32(np, "location", &location);
+
 	if (!ret) {
 		if (location > 5) {
 			dev_err(&pdev->dev, "invalid location\n");
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 49385c86cfba..6dd53af546a3 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1,7 +1,7 @@
 /*
  *  Freescale lpuart serial port driver
  *
- *  Copyright 2012-2013 Freescale Semiconductor, Inc.
+ *  Copyright 2012-2014 Freescale Semiconductor, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -117,8 +117,113 @@
 #define UARTSFIFO_TXOF		0x02
 #define UARTSFIFO_RXUF		0x01
 
-#define DMA_MAXBURST		16
-#define DMA_MAXBURST_MASK	(DMA_MAXBURST - 1)
+/* 32-bit register defination */
+#define UARTBAUD		0x00
+#define UARTSTAT		0x04
+#define UARTCTRL		0x08
+#define UARTDATA		0x0C
+#define UARTMATCH		0x10
+#define UARTMODIR		0x14
+#define UARTFIFO		0x18
+#define UARTWATER		0x1c
+
+#define UARTBAUD_MAEN1		0x80000000
+#define UARTBAUD_MAEN2		0x40000000
+#define UARTBAUD_M10		0x20000000
+#define UARTBAUD_TDMAE		0x00800000
+#define UARTBAUD_RDMAE		0x00200000
+#define UARTBAUD_MATCFG		0x00400000
+#define UARTBAUD_BOTHEDGE	0x00020000
+#define UARTBAUD_RESYNCDIS	0x00010000
+#define UARTBAUD_LBKDIE		0x00008000
+#define UARTBAUD_RXEDGIE	0x00004000
+#define UARTBAUD_SBNS		0x00002000
+#define UARTBAUD_SBR		0x00000000
+#define UARTBAUD_SBR_MASK	0x1fff
+
+#define UARTSTAT_LBKDIF		0x80000000
+#define UARTSTAT_RXEDGIF	0x40000000
+#define UARTSTAT_MSBF		0x20000000
+#define UARTSTAT_RXINV		0x10000000
+#define UARTSTAT_RWUID		0x08000000
+#define UARTSTAT_BRK13		0x04000000
+#define UARTSTAT_LBKDE		0x02000000
+#define UARTSTAT_RAF		0x01000000
+#define UARTSTAT_TDRE		0x00800000
+#define UARTSTAT_TC		0x00400000
+#define UARTSTAT_RDRF		0x00200000
+#define UARTSTAT_IDLE		0x00100000
+#define UARTSTAT_OR		0x00080000
+#define UARTSTAT_NF		0x00040000
+#define UARTSTAT_FE		0x00020000
+#define UARTSTAT_PE		0x00010000
+#define UARTSTAT_MA1F		0x00008000
+#define UARTSTAT_M21F		0x00004000
+
+#define UARTCTRL_R8T9		0x80000000
+#define UARTCTRL_R9T8		0x40000000
+#define UARTCTRL_TXDIR		0x20000000
+#define UARTCTRL_TXINV		0x10000000
+#define UARTCTRL_ORIE		0x08000000
+#define UARTCTRL_NEIE		0x04000000
+#define UARTCTRL_FEIE		0x02000000
+#define UARTCTRL_PEIE		0x01000000
+#define UARTCTRL_TIE		0x00800000
+#define UARTCTRL_TCIE		0x00400000
+#define UARTCTRL_RIE		0x00200000
+#define UARTCTRL_ILIE		0x00100000
+#define UARTCTRL_TE		0x00080000
+#define UARTCTRL_RE		0x00040000
+#define UARTCTRL_RWU		0x00020000
+#define UARTCTRL_SBK		0x00010000
+#define UARTCTRL_MA1IE		0x00008000
+#define UARTCTRL_MA2IE		0x00004000
+#define UARTCTRL_IDLECFG	0x00000100
+#define UARTCTRL_LOOPS		0x00000080
+#define UARTCTRL_DOZEEN		0x00000040
+#define UARTCTRL_RSRC		0x00000020
+#define UARTCTRL_M		0x00000010
+#define UARTCTRL_WAKE		0x00000008
+#define UARTCTRL_ILT		0x00000004
+#define UARTCTRL_PE		0x00000002
+#define UARTCTRL_PT		0x00000001
+
+#define UARTDATA_NOISY		0x00008000
+#define UARTDATA_PARITYE	0x00004000
+#define UARTDATA_FRETSC		0x00002000
+#define UARTDATA_RXEMPT		0x00001000
+#define UARTDATA_IDLINE		0x00000800
+#define UARTDATA_MASK		0x3ff
+
+#define UARTMODIR_IREN		0x00020000
+#define UARTMODIR_TXCTSSRC	0x00000020
+#define UARTMODIR_TXCTSC	0x00000010
+#define UARTMODIR_RXRTSE	0x00000008
+#define UARTMODIR_TXRTSPOL	0x00000004
+#define UARTMODIR_TXRTSE	0x00000002
+#define UARTMODIR_TXCTSE	0x00000001
+
+#define UARTFIFO_TXEMPT		0x00800000
+#define UARTFIFO_RXEMPT		0x00400000
+#define UARTFIFO_TXOF		0x00020000
+#define UARTFIFO_RXUF		0x00010000
+#define UARTFIFO_TXFLUSH	0x00008000
+#define UARTFIFO_RXFLUSH	0x00004000
+#define UARTFIFO_TXOFE		0x00000200
+#define UARTFIFO_RXUFE		0x00000100
+#define UARTFIFO_TXFE		0x00000080
+#define UARTFIFO_FIFOSIZE_MASK	0x7
+#define UARTFIFO_TXSIZE_OFF	4
+#define UARTFIFO_RXFE		0x00000008
+#define UARTFIFO_RXSIZE_OFF	0
+
+#define UARTWATER_COUNT_MASK	0xff
+#define UARTWATER_TXCNT_OFF	8
+#define UARTWATER_RXCNT_OFF	24
+#define UARTWATER_WATER_MASK	0xff
+#define UARTWATER_TXWATER_OFF	0
+#define UARTWATER_RXWATER_OFF	16
+
 #define FSL_UART_RX_DMA_BUFFER_SIZE	64
 
 #define DRIVER_NAME	"fsl-lpuart"
@@ -130,6 +235,7 @@ struct lpuart_port {
 	struct clk		*clk;
 	unsigned int		txfifo_size;
 	unsigned int		rxfifo_size;
+	bool			lpuart32;
 
 	bool			lpuart_dma_use;
 	struct dma_chan		*dma_tx_chan;
@@ -154,6 +260,9 @@ static struct of_device_id lpuart_dt_ids[] = {
 	{
 		.compatible = "fsl,vf610-lpuart",
 	},
+	{
+		.compatible = "fsl,ls1021a-lpuart",
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
@@ -162,6 +271,16 @@ MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
 static void lpuart_dma_tx_complete(void *arg);
 static void lpuart_dma_rx_complete(void *arg);
 
+static u32 lpuart32_read(void __iomem *addr)
+{
+	return ioread32be(addr);
+}
+
+static void lpuart32_write(u32 val, void __iomem *addr)
+{
+	iowrite32be(val, addr);
+}
+
 static void lpuart_stop_tx(struct uart_port *port)
 {
 	unsigned char temp;
@@ -171,6 +290,15 @@ static void lpuart_stop_tx(struct uart_port *port)
 	writeb(temp, port->membase + UARTCR2);
 }
 
+static void lpuart32_stop_tx(struct uart_port *port)
+{
+	unsigned long temp;
+
+	temp = lpuart32_read(port->membase + UARTCTRL);
+	temp &= ~(UARTCTRL_TIE | UARTCTRL_TCIE);
+	lpuart32_write(temp, port->membase + UARTCTRL);
+}
+
 static void lpuart_stop_rx(struct uart_port *port)
 {
 	unsigned char temp;
@@ -179,8 +307,12 @@ static void lpuart_stop_rx(struct uart_port *port)
 	writeb(temp & ~UARTCR2_RE, port->membase + UARTCR2);
 }
 
-static void lpuart_enable_ms(struct uart_port *port)
+static void lpuart32_stop_rx(struct uart_port *port)
 {
+	unsigned long temp;
+
+	temp = lpuart32_read(port->membase + UARTCTRL);
+	lpuart32_write(temp & ~UARTCTRL_RE, port->membase + UARTCTRL);
 }
 
 static void lpuart_copy_rx_to_tty(struct lpuart_port *sport,
@@ -240,7 +372,7 @@ static int lpuart_dma_tx(struct lpuart_port *sport, unsigned long count)
 
 	dma_sync_single_for_device(sport->port.dev, sport->dma_tx_buf_bus,
 				UART_XMIT_SIZE, DMA_TO_DEVICE);
-	sport->dma_tx_bytes = count & ~(DMA_MAXBURST_MASK);
+	sport->dma_tx_bytes = count & ~(sport->txfifo_size - 1);
 	tx_bus_addr = sport->dma_tx_buf_bus + xmit->tail;
 	sport->dma_tx_desc = dmaengine_prep_slave_single(sport->dma_tx_chan,
 					tx_bus_addr, sport->dma_tx_bytes,
@@ -269,7 +401,7 @@ static void lpuart_prepare_tx(struct lpuart_port *sport)
 	if (!count)
 		return;
 
-	if (count < DMA_MAXBURST)
+	if (count < sport->txfifo_size)
 		writeb(readb(sport->port.membase + UARTCR5) & ~UARTCR5_TDMAS,
 				sport->port.membase + UARTCR5);
 	else {
@@ -405,6 +537,30 @@ static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
 		lpuart_stop_tx(&sport->port);
 }
 
+static inline void lpuart32_transmit_buffer(struct lpuart_port *sport)
+{
+	struct circ_buf *xmit = &sport->port.state->xmit;
+	unsigned long txcnt;
+
+	txcnt = lpuart32_read(sport->port.membase + UARTWATER);
+	txcnt = txcnt >> UARTWATER_TXCNT_OFF;
+	txcnt &= UARTWATER_COUNT_MASK;
+	while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) {
+		lpuart32_write(xmit->buf[xmit->tail], sport->port.membase + UARTDATA);
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		sport->port.icount.tx++;
+		txcnt = lpuart32_read(sport->port.membase + UARTWATER);
+		txcnt = txcnt >> UARTWATER_TXCNT_OFF;
+		txcnt &= UARTWATER_COUNT_MASK;
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&sport->port);
+
+	if (uart_circ_empty(xmit))
+		lpuart32_stop_tx(&sport->port);
+}
+
 static void lpuart_start_tx(struct uart_port *port)
 {
 	struct lpuart_port *sport = container_of(port,
@@ -424,6 +580,18 @@ static void lpuart_start_tx(struct uart_port *port)
 	}
 }
 
+static void lpuart32_start_tx(struct uart_port *port)
+{
+	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+	unsigned long temp;
+
+	temp = lpuart32_read(port->membase + UARTCTRL);
+	lpuart32_write(temp | UARTCTRL_TIE, port->membase + UARTCTRL);
+
+	if (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE)
+		lpuart32_transmit_buffer(sport);
+}
+
 static irqreturn_t lpuart_txint(int irq, void *dev_id)
 {
 	struct lpuart_port *sport = dev_id;
@@ -432,16 +600,25 @@ static irqreturn_t lpuart_txint(int irq, void *dev_id)
 
 	spin_lock_irqsave(&sport->port.lock, flags);
 	if (sport->port.x_char) {
-		writeb(sport->port.x_char, sport->port.membase + UARTDR);
+		if (sport->lpuart32)
+			lpuart32_write(sport->port.x_char, sport->port.membase + UARTDATA);
+		else
+			writeb(sport->port.x_char, sport->port.membase + UARTDR);
 		goto out;
 	}
 
 	if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
-		lpuart_stop_tx(&sport->port);
+		if (sport->lpuart32)
+			lpuart32_stop_tx(&sport->port);
+		else
+			lpuart_stop_tx(&sport->port);
 		goto out;
 	}
 
-	lpuart_transmit_buffer(sport);
+	if (sport->lpuart32)
+		lpuart32_transmit_buffer(sport);
+	else
+		lpuart_transmit_buffer(sport);
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(&sport->port);
@@ -514,6 +691,70 @@ out:
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t lpuart32_rxint(int irq, void *dev_id)
+{
+	struct lpuart_port *sport = dev_id;
+	unsigned int flg, ignored = 0;
+	struct tty_port *port = &sport->port.state->port;
+	unsigned long flags;
+	unsigned long rx, sr;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	while (!(lpuart32_read(sport->port.membase + UARTFIFO) & UARTFIFO_RXEMPT)) {
+		flg = TTY_NORMAL;
+		sport->port.icount.rx++;
+		/*
+		 * to clear the FE, OR, NF, FE, PE flags,
+		 * read STAT then read DATA reg
+		 */
+		sr = lpuart32_read(sport->port.membase + UARTSTAT);
+		rx = lpuart32_read(sport->port.membase + UARTDATA);
+		rx &= 0x3ff;
+
+		if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
+			continue;
+
+		if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
+			if (sr & UARTSTAT_PE)
+				sport->port.icount.parity++;
+			else if (sr & UARTSTAT_FE)
+				sport->port.icount.frame++;
+
+			if (sr & UARTSTAT_OR)
+				sport->port.icount.overrun++;
+
+			if (sr & sport->port.ignore_status_mask) {
+				if (++ignored > 100)
+					goto out;
+				continue;
+			}
+
+			sr &= sport->port.read_status_mask;
+
+			if (sr & UARTSTAT_PE)
+				flg = TTY_PARITY;
+			else if (sr & UARTSTAT_FE)
+				flg = TTY_FRAME;
+
+			if (sr & UARTSTAT_OR)
+				flg = TTY_OVERRUN;
+
+#ifdef SUPPORT_SYSRQ
+			sport->port.sysrq = 0;
+#endif
+		}
+
+		tty_insert_flip_char(port, rx, flg);
+	}
+
+out:
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+
+	tty_flip_buffer_push(port);
+	return IRQ_HANDLED;
+}
+
 static irqreturn_t lpuart_int(int irq, void *dev_id)
 {
 	struct lpuart_port *sport = dev_id;
@@ -538,6 +779,26 @@ static irqreturn_t lpuart_int(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t lpuart32_int(int irq, void *dev_id)
+{
+	struct lpuart_port *sport = dev_id;
+	unsigned long sts, rxcount;
+
+	sts = lpuart32_read(sport->port.membase + UARTSTAT);
+	rxcount = lpuart32_read(sport->port.membase + UARTWATER);
+	rxcount = rxcount >> UARTWATER_RXCNT_OFF;
+
+	if (sts & UARTSTAT_RDRF || rxcount > 0)
+		lpuart32_rxint(irq, dev_id);
+
+	if ((sts & UARTSTAT_TDRE) &&
+		!(lpuart32_read(sport->port.membase + UARTBAUD) & UARTBAUD_TDMAE))
+		lpuart_txint(irq, dev_id);
+
+	lpuart32_write(sts, sport->port.membase + UARTSTAT);
+	return IRQ_HANDLED;
+}
+
 /* return TIOCSER_TEMT when transmitter is not busy */
 static unsigned int lpuart_tx_empty(struct uart_port *port)
 {
@@ -545,6 +806,12 @@ static unsigned int lpuart_tx_empty(struct uart_port *port)
 		TIOCSER_TEMT : 0;
 }
 
+static unsigned int lpuart32_tx_empty(struct uart_port *port)
+{
+	return (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TC) ?
+		TIOCSER_TEMT : 0;
+}
+
 static unsigned int lpuart_get_mctrl(struct uart_port *port)
 {
 	unsigned int temp = 0;
@@ -560,6 +827,21 @@ static unsigned int lpuart_get_mctrl(struct uart_port *port)
 	return temp;
 }
 
+static unsigned int lpuart32_get_mctrl(struct uart_port *port)
+{
+	unsigned int temp = 0;
+	unsigned long reg;
+
+	reg = lpuart32_read(port->membase + UARTMODIR);
+	if (reg & UARTMODIR_TXCTSE)
+		temp |= TIOCM_CTS;
+
+	if (reg & UARTMODIR_RXRTSE)
+		temp |= TIOCM_RTS;
+
+	return temp;
+}
+
 static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
 	unsigned char temp;
@@ -576,6 +858,22 @@ static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	writeb(temp, port->membase + UARTMODEM);
 }
 
+static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	unsigned long temp;
+
+	temp = lpuart32_read(port->membase + UARTMODIR) &
+			~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
+
+	if (mctrl & TIOCM_RTS)
+		temp |= UARTMODIR_RXRTSE;
+
+	if (mctrl & TIOCM_CTS)
+		temp |= UARTMODIR_TXCTSE;
+
+	lpuart32_write(temp, port->membase + UARTMODIR);
+}
+
 static void lpuart_break_ctl(struct uart_port *port, int break_state)
 {
 	unsigned char temp;
@@ -588,6 +886,18 @@ static void lpuart_break_ctl(struct uart_port *port, int break_state)
 	writeb(temp, port->membase + UARTCR2);
 }
 
+static void lpuart32_break_ctl(struct uart_port *port, int break_state)
+{
+	unsigned long temp;
+
+	temp = lpuart32_read(port->membase + UARTCTRL) & ~UARTCTRL_SBK;
+
+	if (break_state != 0)
+		temp |= UARTCTRL_SBK;
+
+	lpuart32_write(temp, port->membase + UARTCTRL);
+}
+
 static void lpuart_setup_watermark(struct lpuart_port *sport)
 {
 	unsigned char val, cr2;
@@ -599,15 +909,7 @@ static void lpuart_setup_watermark(struct lpuart_port *sport)
 			UARTCR2_RIE | UARTCR2_RE);
 	writeb(cr2, sport->port.membase + UARTCR2);
 
-	/* determine FIFO size and enable FIFO mode */
 	val = readb(sport->port.membase + UARTPFIFO);
-
-	sport->txfifo_size = 0x1 << (((val >> UARTPFIFO_TXSIZE_OFF) &
-		UARTPFIFO_FIFOSIZE_MASK) + 1);
-
-	sport->rxfifo_size = 0x1 << (((val >> UARTPFIFO_RXSIZE_OFF) &
-		UARTPFIFO_FIFOSIZE_MASK) + 1);
-
 	writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE,
 			sport->port.membase + UARTPFIFO);
 
@@ -622,6 +924,31 @@ static void lpuart_setup_watermark(struct lpuart_port *sport)
 	writeb(cr2_saved, sport->port.membase + UARTCR2);
 }
 
+static void lpuart32_setup_watermark(struct lpuart_port *sport)
+{
+	unsigned long val, ctrl;
+	unsigned long ctrl_saved;
+
+	ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
+	ctrl_saved = ctrl;
+	ctrl &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_TE |
+			UARTCTRL_RIE | UARTCTRL_RE);
+	lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
+
+	/* enable FIFO mode */
+	val = lpuart32_read(sport->port.membase + UARTFIFO);
+	val |= UARTFIFO_TXFE | UARTFIFO_RXFE;
+	val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH;
+	lpuart32_write(val, sport->port.membase + UARTFIFO);
+
+	/* set the watermark */
+	val = (0x1 << UARTWATER_RXWATER_OFF) | (0x0 << UARTWATER_TXWATER_OFF);
+	lpuart32_write(val, sport->port.membase + UARTWATER);
+
+	/* Restore cr2 */
+	lpuart32_write(ctrl_saved, sport->port.membase + UARTCTRL);
+}
+
 static int lpuart_dma_tx_request(struct uart_port *port)
 {
 	struct lpuart_port *sport = container_of(port,
@@ -652,7 +979,7 @@ static int lpuart_dma_tx_request(struct uart_port *port)
 	dma_buf = sport->port.state->xmit.buf;
 	dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDR;
 	dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
-	dma_tx_sconfig.dst_maxburst = DMA_MAXBURST;
+	dma_tx_sconfig.dst_maxburst = sport->txfifo_size;
 	dma_tx_sconfig.direction = DMA_MEM_TO_DEV;
 	ret = dmaengine_slave_config(tx_chan, &dma_tx_sconfig);
 
@@ -724,13 +1051,6 @@ static int lpuart_dma_rx_request(struct uart_port *port)
 	sport->dma_rx_buf_bus = dma_bus;
 	sport->dma_rx_in_progress = 0;
 
-	sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
-				FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
-				sport->rxfifo_size / 2;
-
-	if (sport->dma_rx_timeout < msecs_to_jiffies(20))
-		sport->dma_rx_timeout = msecs_to_jiffies(20);
-
 	return 0;
 }
 
@@ -772,7 +1092,16 @@ static int lpuart_startup(struct uart_port *port)
 	unsigned long flags;
 	unsigned char temp;
 
-	/*whether use dma support by dma request results*/
+	/* determine FIFO size and enable FIFO mode */
+	temp = readb(sport->port.membase + UARTPFIFO);
+
+	sport->txfifo_size = 0x1 << (((temp >> UARTPFIFO_TXSIZE_OFF) &
+		UARTPFIFO_FIFOSIZE_MASK) + 1);
+
+	sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) &
+		UARTPFIFO_FIFOSIZE_MASK) + 1);
+
+	/* Whether use dma support by dma request results */
 	if (lpuart_dma_tx_request(port) || lpuart_dma_rx_request(port)) {
 		sport->lpuart_dma_use = false;
 	} else {
@@ -798,6 +1127,40 @@ static int lpuart_startup(struct uart_port *port)
 	return 0;
 }
 
+static int lpuart32_startup(struct uart_port *port)
+{
+	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+	int ret;
+	unsigned long flags;
+	unsigned long temp;
+
+	/* determine FIFO size */
+	temp = lpuart32_read(sport->port.membase + UARTFIFO);
+
+	sport->txfifo_size = 0x1 << (((temp >> UARTFIFO_TXSIZE_OFF) &
+		UARTFIFO_FIFOSIZE_MASK) - 1);
+
+	sport->rxfifo_size = 0x1 << (((temp >> UARTFIFO_RXSIZE_OFF) &
+		UARTFIFO_FIFOSIZE_MASK) - 1);
+
+	ret = devm_request_irq(port->dev, port->irq, lpuart32_int, 0,
+				DRIVER_NAME, sport);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	lpuart32_setup_watermark(sport);
+
+	temp = lpuart32_read(sport->port.membase + UARTCTRL);
+	temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE | UARTCTRL_TE);
+	temp |= UARTCTRL_ILIE;
+	lpuart32_write(temp, sport->port.membase + UARTCTRL);
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+	return 0;
+}
+
 static void lpuart_shutdown(struct uart_port *port)
 {
 	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
@@ -822,6 +1185,25 @@ static void lpuart_shutdown(struct uart_port *port)
 	}
 }
 
+static void lpuart32_shutdown(struct uart_port *port)
+{
+	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+	unsigned long temp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	/* disable Rx/Tx and interrupts */
+	temp = lpuart32_read(port->membase + UARTCTRL);
+	temp &= ~(UARTCTRL_TE | UARTCTRL_RE |
+			UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
+	lpuart32_write(temp, port->membase + UARTCTRL);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	devm_free_irq(port->dev, port->irq, sport);
+}
+
 static void
 lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
 		   struct ktermios *old)
@@ -922,6 +1304,17 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
 	/* update the per-port timeout */
 	uart_update_timeout(port, termios->c_cflag, baud);
 
+	if (sport->lpuart_dma_use) {
+		/* Calculate delay for 1.5 DMA buffers */
+		sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) *
+					FSL_UART_RX_DMA_BUFFER_SIZE * 3 /
+					sport->rxfifo_size / 2;
+		dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n",
+			sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout);
+		if (sport->dma_rx_timeout < msecs_to_jiffies(20))
+			sport->dma_rx_timeout = msecs_to_jiffies(20);
+	}
+
 	/* wait transmit engin complete */
 	while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC))
 		barrier();
@@ -948,6 +1341,125 @@ lpuart_set_termios(struct uart_port *port, struct ktermios *termios,
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
+static void
+lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
+		   struct ktermios *old)
+{
+	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+	unsigned long flags;
+	unsigned long ctrl, old_ctrl, bd, modem;
+	unsigned int  baud;
+	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
+	unsigned int sbr;
+
+	ctrl = old_ctrl = lpuart32_read(sport->port.membase + UARTCTRL);
+	bd = lpuart32_read(sport->port.membase + UARTBAUD);
+	modem = lpuart32_read(sport->port.membase + UARTMODIR);
+	/*
+	 * only support CS8 and CS7, and for CS7 must enable PE.
+	 * supported mode:
+	 *  - (7,e/o,1)
+	 *  - (8,n,1)
+	 *  - (8,m/s,1)
+	 *  - (8,e/o,1)
+	 */
+	while ((termios->c_cflag & CSIZE) != CS8 &&
+		(termios->c_cflag & CSIZE) != CS7) {
+		termios->c_cflag &= ~CSIZE;
+		termios->c_cflag |= old_csize;
+		old_csize = CS8;
+	}
+
+	if ((termios->c_cflag & CSIZE) == CS8 ||
+		(termios->c_cflag & CSIZE) == CS7)
+		ctrl = old_ctrl & ~UARTCTRL_M;
+
+	if (termios->c_cflag & CMSPAR) {
+		if ((termios->c_cflag & CSIZE) != CS8) {
+			termios->c_cflag &= ~CSIZE;
+			termios->c_cflag |= CS8;
+		}
+		ctrl |= UARTCTRL_M;
+	}
+
+	if (termios->c_cflag & CRTSCTS) {
+		modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
+	} else {
+		termios->c_cflag &= ~CRTSCTS;
+		modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		termios->c_cflag &= ~CSTOPB;
+
+	/* parity must be enabled when CS7 to match 8-bits format */
+	if ((termios->c_cflag & CSIZE) == CS7)
+		termios->c_cflag |= PARENB;
+
+	if ((termios->c_cflag & PARENB)) {
+		if (termios->c_cflag & CMSPAR) {
+			ctrl &= ~UARTCTRL_PE;
+			ctrl |= UARTCTRL_M;
+		} else {
+			ctrl |= UARTCR1_PE;
+			if ((termios->c_cflag & CSIZE) == CS8)
+				ctrl |= UARTCTRL_M;
+			if (termios->c_cflag & PARODD)
+				ctrl |= UARTCTRL_PT;
+			else
+				ctrl &= ~UARTCTRL_PT;
+		}
+	}
+
+	/* ask the core to calculate the divisor */
+	baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	sport->port.read_status_mask = 0;
+	if (termios->c_iflag & INPCK)
+		sport->port.read_status_mask |=	(UARTSTAT_FE | UARTSTAT_PE);
+	if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
+		sport->port.read_status_mask |= UARTSTAT_FE;
+
+	/* characters to ignore */
+	sport->port.ignore_status_mask = 0;
+	if (termios->c_iflag & IGNPAR)
+		sport->port.ignore_status_mask |= UARTSTAT_PE;
+	if (termios->c_iflag & IGNBRK) {
+		sport->port.ignore_status_mask |= UARTSTAT_FE;
+		/*
+		 * if we're ignoring parity and break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (termios->c_iflag & IGNPAR)
+			sport->port.ignore_status_mask |= UARTSTAT_OR;
+	}
+
+	/* update the per-port timeout */
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	/* wait transmit engin complete */
+	while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
+		barrier();
+
+	/* disable transmit and receive */
+	lpuart32_write(old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
+			sport->port.membase + UARTCTRL);
+
+	sbr = sport->port.uartclk / (16 * baud);
+	bd &= ~UARTBAUD_SBR_MASK;
+	bd |= sbr & UARTBAUD_SBR_MASK;
+	bd |= UARTBAUD_BOTHEDGE;
+	bd &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);
+	lpuart32_write(bd, sport->port.membase + UARTBAUD);
+	lpuart32_write(modem, sport->port.membase + UARTMODIR);
+	lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
+	/* restore control register */
+
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+}
+
 static const char *lpuart_type(struct uart_port *port)
 {
 	return "FSL_LPUART";
@@ -996,7 +1508,6 @@ static struct uart_ops lpuart_pops = {
 	.stop_tx	= lpuart_stop_tx,
 	.start_tx	= lpuart_start_tx,
 	.stop_rx	= lpuart_stop_rx,
-	.enable_ms	= lpuart_enable_ms,
 	.break_ctl	= lpuart_break_ctl,
 	.startup	= lpuart_startup,
 	.shutdown	= lpuart_shutdown,
@@ -1008,6 +1519,24 @@ static struct uart_ops lpuart_pops = {
 	.verify_port	= lpuart_verify_port,
 };
 
+static struct uart_ops lpuart32_pops = {
+	.tx_empty	= lpuart32_tx_empty,
+	.set_mctrl	= lpuart32_set_mctrl,
+	.get_mctrl	= lpuart32_get_mctrl,
+	.stop_tx	= lpuart32_stop_tx,
+	.start_tx	= lpuart32_start_tx,
+	.stop_rx	= lpuart32_stop_rx,
+	.break_ctl	= lpuart32_break_ctl,
+	.startup	= lpuart32_startup,
+	.shutdown	= lpuart32_shutdown,
+	.set_termios	= lpuart32_set_termios,
+	.type		= lpuart_type,
+	.request_port	= lpuart_request_port,
+	.release_port	= lpuart_release_port,
+	.config_port	= lpuart_config_port,
+	.verify_port	= lpuart_verify_port,
+};
+
 static struct lpuart_port *lpuart_ports[UART_NR];
 
 #ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
@@ -1019,6 +1548,14 @@ static void lpuart_console_putchar(struct uart_port *port, int ch)
 	writeb(ch, port->membase + UARTDR);
 }
 
+static void lpuart32_console_putchar(struct uart_port *port, int ch)
+{
+	while (!(lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE))
+		barrier();
+
+	lpuart32_write(ch, port->membase + UARTDATA);
+}
+
 static void
 lpuart_console_write(struct console *co, const char *s, unsigned int count)
 {
@@ -1040,6 +1577,27 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count)
 	writeb(old_cr2, sport->port.membase + UARTCR2);
 }
 
+static void
+lpuart32_console_write(struct console *co, const char *s, unsigned int count)
+{
+	struct lpuart_port *sport = lpuart_ports[co->index];
+	unsigned long  old_cr, cr;
+
+	/* first save CR2 and then disable interrupts */
+	cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL);
+	cr |= (UARTCTRL_TE |  UARTCTRL_RE);
+	cr &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE);
+	lpuart32_write(cr, sport->port.membase + UARTCTRL);
+
+	uart_console_write(&sport->port, s, count, lpuart32_console_putchar);
+
+	/* wait for transmitter finish complete and restore CR2 */
+	while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC))
+		barrier();
+
+	lpuart32_write(old_cr, sport->port.membase + UARTCTRL);
+}
+
 /*
  * if the port was already initialised (eg, by a boot loader),
  * try to determine the current setup.
@@ -1093,6 +1651,49 @@ lpuart_console_get_options(struct lpuart_port *sport, int *baud,
 				"from %d to %d\n", baud_raw, *baud);
 }
 
+static void __init
+lpuart32_console_get_options(struct lpuart_port *sport, int *baud,
+			   int *parity, int *bits)
+{
+	unsigned long cr, bd;
+	unsigned int sbr, uartclk, baud_raw;
+
+	cr = lpuart32_read(sport->port.membase + UARTCTRL);
+	cr &= UARTCTRL_TE | UARTCTRL_RE;
+	if (!cr)
+		return;
+
+	/* ok, the port was enabled */
+
+	cr = lpuart32_read(sport->port.membase + UARTCTRL);
+
+	*parity = 'n';
+	if (cr & UARTCTRL_PE) {
+		if (cr & UARTCTRL_PT)
+			*parity = 'o';
+		else
+			*parity = 'e';
+	}
+
+	if (cr & UARTCTRL_M)
+		*bits = 9;
+	else
+		*bits = 8;
+
+	bd = lpuart32_read(sport->port.membase + UARTBAUD);
+	bd &= UARTBAUD_SBR_MASK;
+	sbr = bd;
+	uartclk = clk_get_rate(sport->clk);
+	/*
+	 * baud = mod_clk/(16*(sbr[13]+(brfa)/32)
+	 */
+	baud_raw = uartclk / (16 * sbr);
+
+	if (*baud != baud_raw)
+		printk(KERN_INFO "Serial: Console lpuart rounded baud rate"
+				"from %d to %d\n", baud_raw, *baud);
+}
+
 static int __init lpuart_console_setup(struct console *co, char *options)
 {
 	struct lpuart_port *sport;
@@ -1116,9 +1717,15 @@ static int __init lpuart_console_setup(struct console *co, char *options)
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 	else
-		lpuart_console_get_options(sport, &baud, &parity, &bits);
+		if (sport->lpuart32)
+			lpuart32_console_get_options(sport, &baud, &parity, &bits);
+		else
+			lpuart_console_get_options(sport, &baud, &parity, &bits);
 
-	lpuart_setup_watermark(sport);
+	if (sport->lpuart32)
+		lpuart32_setup_watermark(sport);
+	else
+		lpuart_setup_watermark(sport);
 
 	return uart_set_options(&sport->port, co, baud, parity, bits, flow);
 }
@@ -1134,9 +1741,21 @@ static struct console lpuart_console = {
 	.data		= &lpuart_reg,
 };
 
+static struct console lpuart32_console = {
+	.name		= DEV_NAME,
+	.write		= lpuart32_console_write,
+	.device		= uart_console_device,
+	.setup		= lpuart_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data		= &lpuart_reg,
+};
+
 #define LPUART_CONSOLE	(&lpuart_console)
+#define LPUART32_CONSOLE	(&lpuart32_console)
 #else
 #define LPUART_CONSOLE	NULL
+#define LPUART32_CONSOLE	NULL
 #endif
 
 static struct uart_driver lpuart_reg = {
@@ -1166,7 +1785,7 @@ static int lpuart_probe(struct platform_device *pdev)
 		return ret;
 	}
 	sport->port.line = ret;
-
+	sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res)
 		return -ENODEV;
@@ -1180,7 +1799,10 @@ static int lpuart_probe(struct platform_device *pdev)
 	sport->port.type = PORT_LPUART;
 	sport->port.iotype = UPIO_MEM;
 	sport->port.irq = platform_get_irq(pdev, 0);
-	sport->port.ops = &lpuart_pops;
+	if (sport->lpuart32)
+		sport->port.ops = &lpuart32_pops;
+	else
+		sport->port.ops = &lpuart_pops;
 	sport->port.flags = UPF_BOOT_AUTOCONF;
 
 	sport->clk = devm_clk_get(&pdev->dev, "ipg");
@@ -1202,6 +1824,11 @@ static int lpuart_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, &sport->port);
 
+	if (sport->lpuart32)
+		lpuart_reg.cons = LPUART32_CONSOLE;
+	else
+		lpuart_reg.cons = LPUART_CONSOLE;
+
 	ret = uart_add_one_port(&lpuart_reg, &sport->port);
 	if (ret) {
 		clk_disable_unprepare(sport->clk);
diff --git a/drivers/tty/serial/icom.c b/drivers/tty/serial/icom.c
index 67423805e6d9..d4620fe5da2e 100644
--- a/drivers/tty/serial/icom.c
+++ b/drivers/tty/serial/icom.c
@@ -1052,11 +1052,6 @@ static void icom_stop_rx(struct uart_port *port)
 	writeb(cmdReg & ~CMD_RCV_ENABLE, &ICOM_PORT->dram->CmdReg);
 }
 
-static void icom_enable_ms(struct uart_port *port)
-{
-	/* no-op */
-}
-
 static void icom_break(struct uart_port *port, int break_state)
 {
 	unsigned char cmdReg;
@@ -1300,7 +1295,6 @@ static struct uart_ops icom_ops = {
 	.start_tx = icom_start_tx,
 	.send_xchar = icom_send_xchar,
 	.stop_rx = icom_stop_rx,
-	.enable_ms = icom_enable_ms,
 	.break_ctl = icom_break,
 	.startup = icom_open,
 	.shutdown = icom_close,
diff --git a/drivers/tty/serial/ioc3_serial.c b/drivers/tty/serial/ioc3_serial.c
index 6e4c715c5d26..abd7ea26ed9a 100644
--- a/drivers/tty/serial/ioc3_serial.c
+++ b/drivers/tty/serial/ioc3_serial.c
@@ -1880,7 +1880,6 @@ static struct uart_ops ioc3_ops = {
 	.stop_tx = ic3_stop_tx,
 	.start_tx = ic3_start_tx,
 	.stop_rx = ic3_stop_rx,
-	.enable_ms = null_void_function,
 	.break_ctl = ic3_break_ctl,
 	.startup = ic3_startup,
 	.shutdown = ic3_shutdown,
diff --git a/drivers/tty/serial/ioc4_serial.c b/drivers/tty/serial/ioc4_serial.c
index 1274499850fc..aa28209f44c1 100644
--- a/drivers/tty/serial/ioc4_serial.c
+++ b/drivers/tty/serial/ioc4_serial.c
@@ -2597,7 +2597,6 @@ static struct uart_ops ioc4_ops = {
 	.stop_tx	= ic4_stop_tx,
 	.start_tx	= ic4_start_tx,
 	.stop_rx	= null_void_function,
-	.enable_ms	= null_void_function,
 	.break_ctl	= ic4_break_ctl,
 	.startup	= ic4_startup,
 	.shutdown	= ic4_shutdown,
diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
index 27bb75070c96..3e5c1563afe2 100644
--- a/drivers/tty/serial/jsm/jsm_tty.c
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -177,11 +177,6 @@ static void jsm_tty_stop_rx(struct uart_port *port)
 	channel->ch_bd->bd_ops->disable_receiver(channel);
 }
 
-static void jsm_tty_enable_ms(struct uart_port *port)
-{
-	/* Nothing needed */
-}
-
 static void jsm_tty_break(struct uart_port *port, int break_state)
 {
 	unsigned long lock_flags;
@@ -354,7 +349,6 @@ static struct uart_ops jsm_ops = {
 	.start_tx	= jsm_tty_start_tx,
 	.send_xchar	= jsm_tty_send_xchar,
 	.stop_rx	= jsm_tty_stop_rx,
-	.enable_ms	= jsm_tty_enable_ms,
 	.break_ctl	= jsm_tty_break,
 	.startup	= jsm_tty_open,
 	.shutdown	= jsm_tty_close,
diff --git a/drivers/tty/serial/kgdb_nmi.c b/drivers/tty/serial/kgdb_nmi.c
index cfadf2971b12..6ec7501b464d 100644
--- a/drivers/tty/serial/kgdb_nmi.c
+++ b/drivers/tty/serial/kgdb_nmi.c
@@ -42,7 +42,7 @@ static char *kgdb_nmi_magic = "$3#33";
 module_param_named(magic, kgdb_nmi_magic, charp, 0600);
 MODULE_PARM_DESC(magic, "magic sequence to enter NMI debugger (default $3#33)");
 
-static bool kgdb_nmi_tty_enabled;
+static atomic_t kgdb_nmi_num_readers = ATOMIC_INIT(0);
 
 static int kgdb_nmi_console_setup(struct console *co, char *options)
 {
@@ -136,7 +136,7 @@ static int kgdb_nmi_poll_one_knock(void)
 		n = 0;
 	}
 
-	if (kgdb_nmi_tty_enabled) {
+	if (atomic_read(&kgdb_nmi_num_readers)) {
 		kgdb_tty_recv(c);
 		return 0;
 	}
@@ -197,7 +197,8 @@ static void kgdb_nmi_tty_receiver(unsigned long data)
 	priv->timer.expires = jiffies + (HZ/100);
 	add_timer(&priv->timer);
 
-	if (likely(!kgdb_nmi_tty_enabled || !kfifo_len(&priv->fifo)))
+	if (likely(!atomic_read(&kgdb_nmi_num_readers) ||
+		   !kfifo_len(&priv->fifo)))
 		return;
 
 	while (kfifo_out(&priv->fifo, &ch, 1))
@@ -270,13 +271,23 @@ static void kgdb_nmi_tty_cleanup(struct tty_struct *tty)
 static int kgdb_nmi_tty_open(struct tty_struct *tty, struct file *file)
 {
 	struct kgdb_nmi_tty_priv *priv = tty->driver_data;
+	unsigned int mode = file->f_flags & O_ACCMODE;
+	int ret;
+
+	ret = tty_port_open(&priv->port, tty, file);
+	if (!ret && (mode == O_RDONLY || mode == O_RDWR))
+		atomic_inc(&kgdb_nmi_num_readers);
 
-	return tty_port_open(&priv->port, tty, file);
+	return ret;
 }
 
 static void kgdb_nmi_tty_close(struct tty_struct *tty, struct file *file)
 {
 	struct kgdb_nmi_tty_priv *priv = tty->driver_data;
+	unsigned int mode = file->f_flags & O_ACCMODE;
+
+	if (mode == O_RDONLY || mode == O_RDWR)
+		atomic_dec(&kgdb_nmi_num_readers);
 
 	tty_port_close(&priv->port, tty, file);
 }
@@ -313,12 +324,6 @@ static const struct tty_operations kgdb_nmi_tty_ops = {
 	.write		= kgdb_nmi_tty_write,
 };
 
-static int kgdb_nmi_enable_console(int argc, const char *argv[])
-{
-	kgdb_nmi_tty_enabled = !(argc == 1 && !strcmp(argv[1], "off"));
-	return 0;
-}
-
 int kgdb_register_nmi_console(void)
 {
 	int ret;
@@ -348,19 +353,10 @@ int kgdb_register_nmi_console(void)
 		goto err_drv_reg;
 	}
 
-	ret = kdb_register("nmi_console", kgdb_nmi_enable_console, "[off]",
-			   "switch to Linux NMI console", 0);
-	if (ret) {
-		pr_err("%s: can't register kdb command: %d\n", __func__, ret);
-		goto err_kdb_reg;
-	}
-
 	register_console(&kgdb_nmi_console);
 	arch_kgdb_ops.enable_nmi(1);
 
 	return 0;
-err_kdb_reg:
-	tty_unregister_driver(kgdb_nmi_tty_driver);
 err_drv_reg:
 	put_tty_driver(kgdb_nmi_tty_driver);
 	return ret;
@@ -375,8 +371,6 @@ int kgdb_unregister_nmi_console(void)
 		return 0;
 	arch_kgdb_ops.enable_nmi(0);
 
-	kdb_unregister("nmi_console");
-
 	ret = unregister_console(&kgdb_nmi_console);
 	if (ret)
 		return ret;
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 88d01e0bb0c8..4675fe198d31 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -154,11 +154,6 @@ lqasc_stop_rx(struct uart_port *port)
 	ltq_w32(ASCWHBSTATE_CLRREN, port->membase + LTQ_ASC_WHBSTATE);
 }
 
-static void
-lqasc_enable_ms(struct uart_port *port)
-{
-}
-
 static int
 lqasc_rx_chars(struct uart_port *port)
 {
@@ -568,7 +563,6 @@ static struct uart_ops lqasc_pops = {
 	.stop_tx =	lqasc_stop_tx,
 	.start_tx =	lqasc_start_tx,
 	.stop_rx =	lqasc_stop_rx,
-	.enable_ms =	lqasc_enable_ms,
 	.break_ctl =	lqasc_break_ctl,
 	.startup =	lqasc_startup,
 	.shutdown =	lqasc_shutdown,
@@ -709,7 +703,7 @@ lqasc_probe(struct platform_device *pdev)
 	port = &ltq_port->port;
 
 	port->iotype	= SERIAL_IO_MEM;
-	port->flags	= ASYNC_BOOT_AUTOCONF | UPF_IOREMAP;
+	port->flags	= UPF_BOOT_AUTOCONF | UPF_IOREMAP;
 	port->ops	= &lqasc_pops;
 	port->fifosize	= 16;
 	port->type	= PORT_LTQ_ASC,
diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index 701644f06820..6f0f89282847 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -427,12 +427,6 @@ static void serial_lpc32xx_stop_rx(struct uart_port *port)
 		LPC32XX_HSU_FE_INT), LPC32XX_HSUART_IIR(port->membase));
 }
 
-/* port->lock held by caller.  */
-static void serial_lpc32xx_enable_ms(struct uart_port *port)
-{
-	/* Modem status is not supported */
-}
-
 /* port->lock is not held.  */
 static void serial_lpc32xx_break_ctl(struct uart_port *port,
 				     int break_state)
@@ -658,7 +652,6 @@ static struct uart_ops serial_lpc32xx_pops = {
 	.stop_tx	= serial_lpc32xx_stop_tx,
 	.start_tx	= serial_lpc32xx_start_tx,
 	.stop_rx	= serial_lpc32xx_stop_rx,
-	.enable_ms	= serial_lpc32xx_enable_ms,
 	.break_ctl	= serial_lpc32xx_break_ctl,
 	.startup	= serial_lpc32xx_startup,
 	.shutdown	= serial_lpc32xx_shutdown,
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index ba285cd45b59..82573dc4d8cf 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1008,7 +1008,6 @@ static const struct uart_ops max310x_ops = {
 	.stop_tx	= max310x_null_void,
 	.start_tx	= max310x_start_tx,
 	.stop_rx	= max310x_null_void,
-	.enable_ms	= max310x_null_void,
 	.break_ctl	= max310x_break_ctl,
 	.startup	= max310x_startup,
 	.shutdown	= max310x_shutdown,
diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index a6f085717f94..bc896dc7d2ed 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -150,12 +150,6 @@ static void mcf_break_ctl(struct uart_port *port, int break_state)
 
 /****************************************************************************/
 
-static void mcf_enable_ms(struct uart_port *port)
-{
-}
-
-/****************************************************************************/
-
 static int mcf_startup(struct uart_port *port)
 {
 	struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
@@ -507,7 +501,6 @@ static const struct uart_ops mcf_uart_ops = {
 	.start_tx	= mcf_start_tx,
 	.stop_tx	= mcf_stop_tx,
 	.stop_rx	= mcf_stop_rx,
-	.enable_ms	= mcf_enable_ms,
 	.break_ctl	= mcf_break_ctl,
 	.startup	= mcf_startup,
 	.shutdown	= mcf_shutdown,
@@ -544,7 +537,7 @@ int __init early_mcf_setup(struct mcf_platform_uart *platp)
 		port->iotype = SERIAL_IO_MEM;
 		port->irq = platp[i].irq;
 		port->uartclk = MCF_BUSCLK;
-		port->flags = ASYNC_BOOT_AUTOCONF;
+		port->flags = UPF_BOOT_AUTOCONF;
 		port->ops = &mcf_uart_ops;
 	}
 
@@ -669,7 +662,7 @@ static int mcf_probe(struct platform_device *pdev)
 		port->irq = platp[i].irq;
 		port->uartclk = MCF_BUSCLK;
 		port->ops = &mcf_uart_ops;
-		port->flags = ASYNC_BOOT_AUTOCONF;
+		port->flags = UPF_BOOT_AUTOCONF;
 
 		uart_add_one_port(&mcf_driver, port);
 	}
diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index c9d18548783a..30e9e60bc5cd 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -308,9 +308,6 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
 	if (port->x_char)
 		goto out;
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(port);
-
 	/* calculate bytes to copy */
 	qlen = uart_circ_chars_pending(xmit);
 	if (qlen <= 0)
@@ -357,6 +354,9 @@ static void men_z135_handle_tx(struct men_z135_port *uart)
 
 	port->icount.tx += n;
 
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
 irq_en:
 	if (!uart_circ_empty(xmit))
 		men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
diff --git a/drivers/tty/serial/mpsc.c b/drivers/tty/serial/mpsc.c
index 759c6a6fa74a..ae49856ef6c7 100644
--- a/drivers/tty/serial/mpsc.c
+++ b/drivers/tty/serial/mpsc.c
@@ -1336,10 +1336,6 @@ static void mpsc_stop_rx(struct uart_port *port)
 	mpsc_sdma_cmd(pi, SDMA_SDCM_AR);
 }
 
-static void mpsc_enable_ms(struct uart_port *port)
-{
-}
-
 static void mpsc_break_ctl(struct uart_port *port, int ctl)
 {
 	struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
@@ -1674,7 +1670,6 @@ static struct uart_ops mpsc_pops = {
 	.stop_tx	= mpsc_stop_tx,
 	.start_tx	= mpsc_start_tx,
 	.stop_rx	= mpsc_stop_rx,
-	.enable_ms	= mpsc_enable_ms,
 	.break_ctl	= mpsc_break_ctl,
 	.startup	= mpsc_startup,
 	.shutdown	= mpsc_shutdown,
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index db0448ae59dc..1504a14ec1a6 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -698,10 +698,6 @@ static void serial_m3110_pm(struct uart_port *port, unsigned int state,
 {
 }
 
-static void serial_m3110_enable_ms(struct uart_port *port)
-{
-}
-
 static struct uart_ops serial_m3110_ops = {
 	.tx_empty	= serial_m3110_tx_empty,
 	.set_mctrl	= serial_m3110_set_mctrl,
@@ -709,7 +705,6 @@ static struct uart_ops serial_m3110_ops = {
 	.stop_tx	= serial_m3110_stop_tx,
 	.start_tx	= serial_m3110_start_tx,
 	.stop_rx	= serial_m3110_stop_rx,
-	.enable_ms	= serial_m3110_enable_ms,
 	.break_ctl	= serial_m3110_break_ctl,
 	.startup	= serial_m3110_startup,
 	.shutdown	= serial_m3110_shutdown,
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 72000a6d5af0..0da0b5474e98 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -125,14 +125,14 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 	port->icount.rx += count;
 
 	while (count > 0) {
-		unsigned int c;
+		unsigned char buf[4];
 
 		sr = msm_read(port, UART_SR);
 		if ((sr & UART_SR_RX_READY) == 0) {
 			msm_port->old_snap_state -= count;
 			break;
 		}
-		c = msm_read(port, UARTDM_RF);
+		ioread32_rep(port->membase + UARTDM_RF, buf, 1);
 		if (sr & UART_SR_RX_BREAK) {
 			port->icount.brk++;
 			if (uart_handle_break(port))
@@ -141,8 +141,7 @@ static void handle_rx_dm(struct uart_port *port, unsigned int misr)
 			port->icount.frame++;
 
 		/* TODO: handle sysrq */
-		tty_insert_flip_string(tport, (char *)&c,
-				       (count > 4) ? 4 : count);
+		tty_insert_flip_string(tport, buf, min(count, 4));
 		count -= 4;
 	}
 
@@ -219,6 +218,12 @@ static void handle_tx(struct uart_port *port)
 	struct msm_port *msm_port = UART_TO_MSM(port);
 	unsigned int tx_count, num_chars;
 	unsigned int tf_pointer = 0;
+	void __iomem *tf;
+
+	if (msm_port->is_uartdm)
+		tf = port->membase + UARTDM_TF;
+	else
+		tf = port->membase + UART_TF;
 
 	tx_count = uart_circ_chars_pending(xmit);
 	tx_count = min3(tx_count, (unsigned int)UART_XMIT_SIZE - xmit->tail,
@@ -228,8 +233,7 @@ static void handle_tx(struct uart_port *port)
 		if (msm_port->is_uartdm)
 			reset_dm_count(port, tx_count + 1);
 
-		msm_write(port, port->x_char,
-			  msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+		iowrite8_rep(tf, &port->x_char, 1);
 		port->icount.tx++;
 		port->x_char = 0;
 	} else if (tx_count && msm_port->is_uartdm) {
@@ -239,7 +243,6 @@ static void handle_tx(struct uart_port *port)
 	while (tf_pointer < tx_count) {
 		int i;
 		char buf[4] = { 0 };
-		unsigned int *bf = (unsigned int *)&buf;
 
 		if (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
 			break;
@@ -255,7 +258,7 @@ static void handle_tx(struct uart_port *port)
 			port->icount.tx++;
 		}
 
-		msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+		iowrite32_rep(tf, buf, 1);
 		xmit->tail = (xmit->tail + num_chars) & (UART_XMIT_SIZE - 1);
 		tf_pointer += num_chars;
 	}
@@ -861,12 +864,18 @@ static void msm_console_write(struct console *co, const char *s,
 	struct msm_port *msm_port;
 	int num_newlines = 0;
 	bool replaced = false;
+	void __iomem *tf;
 
 	BUG_ON(co->index < 0 || co->index >= UART_NR);
 
 	port = get_port_from_line(co->index);
 	msm_port = UART_TO_MSM(port);
 
+	if (msm_port->is_uartdm)
+		tf = port->membase + UARTDM_TF;
+	else
+		tf = port->membase + UART_TF;
+
 	/* Account for newlines that will get a carriage return added */
 	for (i = 0; i < count; i++)
 		if (s[i] == '\n')
@@ -882,7 +891,6 @@ static void msm_console_write(struct console *co, const char *s,
 		int j;
 		unsigned int num_chars;
 		char buf[4] = { 0 };
-		unsigned int *bf = (unsigned int *)&buf;
 
 		if (msm_port->is_uartdm)
 			num_chars = min(count - i, (unsigned int)sizeof(buf));
@@ -907,7 +915,7 @@ static void msm_console_write(struct console *co, const char *s,
 		while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
 			cpu_relax();
 
-		msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
+		iowrite32_rep(tf, buf, 1);
 		i += num_chars;
 	}
 	spin_unlock(&port->lock);
@@ -917,7 +925,7 @@ static int __init msm_console_setup(struct console *co, char *options)
 {
 	struct uart_port *port;
 	struct msm_port *msm_port;
-	int baud, flow, bits, parity;
+	int baud = 0, flow, bits, parity;
 
 	if (unlikely(co->index >= UART_NR || co->index < 0))
 		return -ENXIO;
@@ -1057,7 +1065,7 @@ static int msm_serial_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct of_device_id msm_match_table[] = {
+static const struct of_device_id msm_match_table[] = {
 	{ .compatible = "qcom,msm-uart" },
 	{ .compatible = "qcom,msm-uartdm" },
 	{}
diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h
index d98d45efdf86..73d3abe71e79 100644
--- a/drivers/tty/serial/msm_serial.h
+++ b/drivers/tty/serial/msm_serial.h
@@ -126,13 +126,13 @@
 static inline
 void msm_write(struct uart_port *port, unsigned int val, unsigned int off)
 {
-	__raw_writel(val, port->membase + off);
+	writel_relaxed(val, port->membase + off);
 }
 
 static inline
 unsigned int msm_read(struct uart_port *port, unsigned int off)
 {
-	return __raw_readl(port->membase + off);
+	return readl_relaxed(port->membase + off);
 }
 
 /*
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index be127d0da32c..dd26511ad875 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -169,16 +169,6 @@ static void mux_stop_rx(struct uart_port *port)
 }
 
 /**
- * mux_enable_ms - Enable modum status interrupts.
- * @port: Ptr to the uart_port.
- *
- * The Serial Mux does not support this function.
- */
-static void mux_enable_ms(struct uart_port *port)
-{
-}
-
-/**
  * mux_break_ctl - Control the transmitssion of a break signal.
  * @port: Ptr to the uart_port.
  * @break_state: Raise/Lower the break signal.
@@ -449,7 +439,6 @@ static struct uart_ops mux_pops = {
 	.stop_tx =		mux_stop_tx,
 	.start_tx =		mux_start_tx,
 	.stop_rx =		mux_stop_rx,
-	.enable_ms =		mux_enable_ms,
 	.break_ctl =		mux_break_ctl,
 	.startup =		mux_startup,
 	.shutdown =		mux_shutdown,
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index 86de4477d98a..b5c329248c81 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -815,17 +815,11 @@ static void mxs_auart_break_ctl(struct uart_port *u, int ctl)
 			     u->membase + AUART_LINECTRL_CLR);
 }
 
-static void mxs_auart_enable_ms(struct uart_port *port)
-{
-	/* just empty */
-}
-
 static struct uart_ops mxs_auart_ops = {
 	.tx_empty       = mxs_auart_tx_empty,
 	.start_tx       = mxs_auart_start_tx,
 	.stop_tx	= mxs_auart_stop_tx,
 	.stop_rx	= mxs_auart_stop_rx,
-	.enable_ms      = mxs_auart_enable_ms,
 	.break_ctl      = mxs_auart_break_ctl,
 	.set_mctrl	= mxs_auart_set_mctrl,
 	.get_mctrl      = mxs_auart_get_mctrl,
diff --git a/drivers/tty/serial/nwpserial.c b/drivers/tty/serial/nwpserial.c
index 693bc6c2561e..c06366b6bc29 100644
--- a/drivers/tty/serial/nwpserial.c
+++ b/drivers/tty/serial/nwpserial.c
@@ -240,11 +240,6 @@ static void nwpserial_break_ctl(struct uart_port *port, int ctl)
 	/* N/A */
 }
 
-static void nwpserial_enable_ms(struct uart_port *port)
-{
-	/* N/A */
-}
-
 static void nwpserial_stop_rx(struct uart_port *port)
 {
 	struct nwpserial_port *up;
@@ -315,7 +310,6 @@ static struct uart_ops nwpserial_pops = {
 	.stop_tx      = nwpserial_stop_tx,
 	.start_tx     = nwpserial_start_tx,
 	.stop_rx      = nwpserial_stop_rx,
-	.enable_ms    = nwpserial_enable_ms,
 	.break_ctl    = nwpserial_break_ctl,
 	.startup      = nwpserial_startup,
 	.shutdown     = nwpserial_shutdown,
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 0cb6a8e52bd0..ea4ffc2ebb2f 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -736,9 +736,10 @@ static void pch_request_dma(struct uart_port *port)
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	dma_dev = pci_get_bus_and_slot(priv->pdev->bus->number,
-				       PCI_DEVFN(0xa, 0)); /* Get DMA's dev
-								information */
+	/* Get DMA's dev information */
+	dma_dev = pci_get_slot(priv->pdev->bus,
+			PCI_DEVFN(PCI_SLOT(priv->pdev->devfn), 0));
+
 	/* Set Tx DMA */
 	param = &priv->param_tx;
 	param->dma_dev = &dma_dev->dev;
@@ -1047,7 +1048,7 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
 					priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
 					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 	if (!desc) {
-		dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
+		dev_err(priv->port.dev, "%s:dmaengine_prep_slave_sg Failed\n",
 			__func__);
 		return 0;
 	}
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index c638c53cd2b6..21b7d8b86493 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -778,7 +778,7 @@ static struct uart_ops serial_pxa_pops = {
 	.request_port	= serial_pxa_request_port,
 	.config_port	= serial_pxa_config_port,
 	.verify_port	= serial_pxa_verify_port,
-#ifdef CONFIG_CONSOLE_POLL
+#if defined(CONFIG_CONSOLE_POLL) && defined(CONFIG_SERIAL_PXA_CONSOLE)
 	.poll_get_char = serial_pxa_get_poll_char,
 	.poll_put_char = serial_pxa_put_poll_char,
 #endif
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index c1d3ebdf3b97..4aff02d6712e 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -203,10 +203,6 @@ static void s3c24xx_serial_stop_rx(struct uart_port *port)
 	}
 }
 
-static void s3c24xx_serial_enable_ms(struct uart_port *port)
-{
-}
-
 static inline struct s3c24xx_uart_info *s3c24xx_port_to_info(struct uart_port *port)
 {
 	return to_ourport(port)->info;
@@ -952,7 +948,6 @@ static struct uart_ops s3c24xx_serial_ops = {
 	.stop_tx	= s3c24xx_serial_stop_tx,
 	.start_tx	= s3c24xx_serial_start_tx,
 	.stop_rx	= s3c24xx_serial_stop_rx,
-	.enable_ms	= s3c24xx_serial_enable_ms,
 	.break_ctl	= s3c24xx_serial_break_ctl,
 	.startup	= s3c24xx_serial_startup,
 	.shutdown	= s3c24xx_serial_shutdown,
@@ -1226,8 +1221,8 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 		wr_regl(port, S3C64XX_UINTSP, 0xf);
 	}
 
-	dbg("port: map=%08x, mem=%p, irq=%d (%d,%d), clock=%u\n",
-	    port->mapbase, port->membase, port->irq,
+	dbg("port: map=%pa, mem=%p, irq=%d (%d,%d), clock=%u\n",
+	    &port->mapbase, port->membase, port->irq,
 	    ourport->rx_irq, ourport->tx_irq, port->uartclk);
 
 	/* reset the fifos (and setup the uart) */
@@ -1274,12 +1269,20 @@ static inline struct s3c24xx_serial_drv_data *s3c24xx_get_driver_data(
 
 static int s3c24xx_serial_probe(struct platform_device *pdev)
 {
+	struct device_node *np = pdev->dev.of_node;
 	struct s3c24xx_uart_port *ourport;
+	int index = probe_index;
 	int ret;
 
-	dbg("s3c24xx_serial_probe(%p) %d\n", pdev, probe_index);
+	if (np) {
+		ret = of_alias_get_id(np, "serial");
+		if (ret >= 0)
+			index = ret;
+	}
+
+	dbg("s3c24xx_serial_probe(%p) %d\n", pdev, index);
 
-	ourport = &s3c24xx_serial_ports[probe_index];
+	ourport = &s3c24xx_serial_ports[index];
 
 	ourport->drv_data = s3c24xx_get_driver_data(pdev);
 	if (!ourport->drv_data) {
@@ -1293,9 +1296,15 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 			dev_get_platdata(&pdev->dev) :
 			ourport->drv_data->def_cfg;
 
-	ourport->port.fifosize = (ourport->info->fifosize) ?
-		ourport->info->fifosize :
-		ourport->drv_data->fifosize[probe_index];
+	if (np)
+		of_property_read_u32(np,
+			"samsung,uart-fifosize", &ourport->port.fifosize);
+
+	if (!ourport->port.fifosize) {
+		ourport->port.fifosize = (ourport->info->fifosize) ?
+			ourport->info->fifosize :
+			ourport->drv_data->fifosize[index];
+	}
 
 	probe_index++;
 
@@ -1303,7 +1312,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 
 	ret = s3c24xx_serial_init_port(ourport, pdev);
 	if (ret < 0)
-		goto probe_err;
+		return ret;
 
 	if (!s3c24xx_uart_drv.state) {
 		ret = uart_register_driver(&s3c24xx_uart_drv);
@@ -1335,9 +1344,6 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "failed to add cpufreq notifier\n");
 
 	return 0;
-
- probe_err:
-	return ret;
 }
 
 static int s3c24xx_serial_remove(struct platform_device *dev)
@@ -1537,8 +1543,8 @@ s3c24xx_serial_get_options(struct uart_port *port, int *baud,
 		case S3C2410_LCON_CS7:
 			*bits = 7;
 			break;
-		default:
 		case S3C2410_LCON_CS8:
+		default:
 			*bits = 8;
 			break;
 		}
@@ -1712,9 +1718,7 @@ static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
 #define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
 #endif
 
-#if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410) || \
-	defined(CONFIG_CPU_S5P6440) || defined(CONFIG_CPU_S5P6450) || \
-	defined(CONFIG_CPU_S5PC100)
+#if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
 static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
 	.info = &(struct s3c24xx_uart_info) {
 		.name		= "Samsung S3C6400 UART",
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 1b6a77c4b2cb..3284c31085a7 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -991,7 +991,6 @@ static const struct uart_ops sc16is7xx_ops = {
 	.stop_tx	= sc16is7xx_stop_tx,
 	.start_tx	= sc16is7xx_start_tx,
 	.stop_rx	= sc16is7xx_stop_rx,
-	.enable_ms	= sc16is7xx_null_void,
 	.break_ctl	= sc16is7xx_break_ctl,
 	.startup	= sc16is7xx_startup,
 	.shutdown	= sc16is7xx_shutdown,
@@ -1061,7 +1060,6 @@ static int sc16is7xx_probe(struct device *dev,
 			   struct regmap *regmap, int irq, unsigned long flags)
 {
 	unsigned long freq, *pfreq = dev_get_platdata(dev);
-	struct clk *clk;
 	int i, ret;
 	struct sc16is7xx_port *s;
 
@@ -1077,14 +1075,14 @@ static int sc16is7xx_probe(struct device *dev,
 		return -ENOMEM;
 	}
 
-	clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(clk)) {
+	s->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(s->clk)) {
 		if (pfreq)
 			freq = *pfreq;
 		else
-			return PTR_ERR(clk);
+			return PTR_ERR(s->clk);
 	} else {
-		freq = clk_get_rate(clk);
+		freq = clk_get_rate(s->clk);
 	}
 
 	s->regmap = regmap;
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
index e84b6a3bdd18..75850f70b479 100644
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -533,11 +533,6 @@ static unsigned int sccnxp_tx_empty(struct uart_port *port)
 	return (val & SR_TXEMT) ? TIOCSER_TEMT : 0;
 }
 
-static void sccnxp_enable_ms(struct uart_port *port)
-{
-	/* Do nothing */
-}
-
 static void sccnxp_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
 	struct sccnxp_port *s = dev_get_drvdata(port->dev);
@@ -790,7 +785,6 @@ static const struct uart_ops sccnxp_ops = {
 	.stop_tx	= sccnxp_stop_tx,
 	.start_tx	= sccnxp_start_tx,
 	.stop_rx	= sccnxp_stop_rx,
-	.enable_ms	= sccnxp_enable_ms,
 	.break_ctl	= sccnxp_break_ctl,
 	.startup	= sccnxp_startup,
 	.shutdown	= sccnxp_shutdown,
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index d5c2a287b7e7..53d7c31ce098 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -482,6 +482,9 @@ static void tegra_uart_stop_tx(struct uart_port *u)
 	struct dma_tx_state state;
 	int count;
 
+	if (tup->tx_in_progress != TEGRA_UART_TX_DMA)
+		return;
+
 	dmaengine_terminate_all(tup->tx_dma_chan);
 	dmaengine_tx_status(tup->tx_dma_chan, tup->tx_cookie, &state);
 	count = tup->tx_bytes_requested - state.residue;
@@ -599,6 +602,7 @@ static void tegra_uart_handle_rx_dma(struct tegra_uart_port *tup,
 
 	dmaengine_terminate_all(tup->rx_dma_chan);
 	dmaengine_tx_status(tup->rx_dma_chan,  tup->rx_cookie, &state);
+	async_tx_ack(tup->rx_dma_desc);
 	count = tup->rx_bytes_requested - state.residue;
 
 	/* If we are here, DMA is stopped */
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index fbf6c5ad222f..8bb19da01639 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -243,6 +243,9 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 		/*
 		 * Turn off DTR and RTS early.
 		 */
+		if (uart_console(uport) && tty)
+			uport->cons->cflag = tty->termios.c_cflag;
+
 		if (!tty || (tty->termios.c_cflag & HUPCL))
 			uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
 
@@ -447,6 +450,7 @@ static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
 		return;
 
 	termios = &tty->termios;
+	uport->ops->set_termios(uport, termios, old_termios);
 
 	/*
 	 * Set flags based on termios cflag
@@ -460,8 +464,6 @@ static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
 		clear_bit(ASYNCB_CHECK_CD, &port->flags);
 	else
 		set_bit(ASYNCB_CHECK_CD, &port->flags);
-
-	uport->ops->set_termios(uport, termios, old_termios);
 }
 
 static inline int __uart_put_char(struct uart_port *port,
@@ -1050,6 +1052,15 @@ static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
 	return ret;
 }
 
+static void uart_enable_ms(struct uart_port *uport)
+{
+	/*
+	 * Force modem status interrupts on
+	 */
+	if (uport->ops->enable_ms)
+		uport->ops->enable_ms(uport);
+}
+
 /*
  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
  * - mask passed in arg for lines of interest
@@ -1073,11 +1084,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg)
 	 */
 	spin_lock_irq(&uport->lock);
 	memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
-
-	/*
-	 * Force modem status interrupts on
-	 */
-	uport->ops->enable_ms(uport);
+	uart_enable_ms(uport);
 	spin_unlock_irq(&uport->lock);
 
 	add_wait_queue(&port->delta_msr_wait, &wait);
@@ -1274,6 +1281,8 @@ static void uart_set_termios(struct tty_struct *tty,
 	}
 
 	uart_change_speed(tty, state, old_termios);
+	/* reload cflag from termios; port driver may have overriden flags */
+	cflag = tty->termios.c_cflag;
 
 	/* Handle transition to B0 status */
 	if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
@@ -1360,8 +1369,8 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
 	tty_ldisc_flush(tty);
 
 	tty_port_tty_set(port, NULL);
-	spin_lock_irqsave(&port->lock, flags);
 	tty->closing = 0;
+	spin_lock_irqsave(&port->lock, flags);
 
 	if (port->blocked_open) {
 		spin_unlock_irqrestore(&port->lock, flags);
@@ -1508,7 +1517,7 @@ static int uart_carrier_raised(struct tty_port *port)
 	struct uart_port *uport = state->uart_port;
 	int mctrl;
 	spin_lock_irq(&uport->lock);
-	uport->ops->enable_ms(uport);
+	uart_enable_ms(uport);
 	mctrl = uport->ops->get_mctrl(uport);
 	spin_unlock_irq(&uport->lock);
 	if (mctrl & TIOCM_CAR)
@@ -1576,14 +1585,6 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
 	tty_port_tty_set(port, tty);
 
 	/*
-	 * If the port is in the middle of closing, bail out now.
-	 */
-	if (tty_hung_up_p(filp)) {
-		retval = -EAGAIN;
-		goto err_dec_count;
-	}
-
-	/*
 	 * Start up the serial port.
 	 */
 	retval = uart_startup(tty, state, 0);
@@ -2563,12 +2564,6 @@ static const struct attribute_group tty_dev_attr_group = {
 	.attrs = tty_dev_attrs,
 	};
 
-static const struct attribute_group *tty_dev_attr_groups[] = {
-	&tty_dev_attr_group,
-	NULL
-	};
-
-
 /**
  *	uart_add_one_port - attach a driver-defined port structure
  *	@drv: pointer to the uart low level driver structure for this port
@@ -2585,6 +2580,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
 	struct tty_port *port;
 	int ret = 0;
 	struct device *tty_dev;
+	int num_groups;
 
 	BUG_ON(in_interrupt());
 
@@ -2618,12 +2614,26 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
 
 	uart_configure_port(drv, state, uport);
 
+	num_groups = 2;
+	if (uport->attr_group)
+		num_groups++;
+
+	uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups),
+				    GFP_KERNEL);
+	if (!uport->tty_groups) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	uport->tty_groups[0] = &tty_dev_attr_group;
+	if (uport->attr_group)
+		uport->tty_groups[1] = uport->attr_group;
+
 	/*
 	 * Register the port whether it's detected or not.  This allows
 	 * setserial to be used to alter this port's parameters.
 	 */
 	tty_dev = tty_port_register_device_attr(port, drv->tty_driver,
-			uport->line, uport->dev, port, tty_dev_attr_groups);
+			uport->line, uport->dev, port, uport->tty_groups);
 	if (likely(!IS_ERR(tty_dev))) {
 		device_set_wakeup_capable(tty_dev, 1);
 	} else {
@@ -2702,6 +2712,7 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
 	 */
 	if (uport->type != PORT_UNKNOWN)
 		uport->ops->release_port(uport);
+	kfree(uport->tty_groups);
 
 	/*
 	 * Indicate that there isn't a port here anymore.
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index ea8546092c7e..af115645c51f 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -142,7 +142,6 @@ struct uart_txx9_port {
 #define TXX9_SIFCR_RDIL_12	0x00000180
 #define TXX9_SIFCR_RDIL_MAX	0x00000180
 #define TXX9_SIFCR_TDIL_MASK	0x00000018
-#define TXX9_SIFCR_TDIL_MASK	0x00000018
 #define TXX9_SIFCR_TDIL_1	0x00000000
 #define TXX9_SIFCR_TDIL_4	0x00000001
 #define TXX9_SIFCR_TDIL_8	0x00000010
@@ -244,11 +243,6 @@ static void serial_txx9_stop_rx(struct uart_port *port)
 	up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
 }
 
-static void serial_txx9_enable_ms(struct uart_port *port)
-{
-	/* TXX9-SIO can not control DTR... */
-}
-
 static void serial_txx9_initialize(struct uart_port *port)
 {
 	struct uart_txx9_port *up = to_uart_txx9_port(port);
@@ -858,7 +852,6 @@ static struct uart_ops serial_txx9_pops = {
 	.stop_tx	= serial_txx9_stop_tx,
 	.start_tx	= serial_txx9_start_tx,
 	.stop_rx	= serial_txx9_stop_rx,
-	.enable_ms	= serial_txx9_enable_ms,
 	.break_ctl	= serial_txx9_break_ctl,
 	.startup	= serial_txx9_startup,
 	.shutdown	= serial_txx9_shutdown,
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 88236da0ddf7..3081e46085ce 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1560,13 +1560,6 @@ static void sci_stop_rx(struct uart_port *port)
 	serial_port_out(port, SCSCR, ctrl);
 }
 
-static void sci_enable_ms(struct uart_port *port)
-{
-	/*
-	 * Not supported by hardware, always a nop.
-	 */
-}
-
 static void sci_break_ctl(struct uart_port *port, int break_state)
 {
 	struct sci_port *s = to_sci_port(port);
@@ -1783,30 +1776,71 @@ static unsigned int sci_scbrr_calc(struct sci_port *s, unsigned int bps,
 	return ((freq + 16 * bps) / (32 * bps) - 1);
 }
 
+/* calculate frame length from SMR */
+static int sci_baud_calc_frame_len(unsigned int smr_val)
+{
+	int len = 10;
+
+	if (smr_val & SCSMR_CHR)
+		len--;
+	if (smr_val & SCSMR_PE)
+		len++;
+	if (smr_val & SCSMR_STOP)
+		len++;
+
+	return len;
+}
+
+
 /* calculate sample rate, BRR, and clock select for HSCIF */
 static void sci_baud_calc_hscif(unsigned int bps, unsigned long freq,
 				int *brr, unsigned int *srr,
-				unsigned int *cks)
+				unsigned int *cks, int frame_len)
 {
-	int sr, c, br, err;
+	int sr, c, br, err, recv_margin;
 	int min_err = 1000; /* 100% */
+	int recv_max_margin = 0;
 
 	/* Find the combination of sample rate and clock select with the
 	   smallest deviation from the desired baud rate. */
 	for (sr = 8; sr <= 32; sr++) {
 		for (c = 0; c <= 3; c++) {
 			/* integerized formulas from HSCIF documentation */
-			br = freq / (sr * (1 << (2 * c + 1)) * bps) - 1;
-			if (br < 0 || br > 255)
+			br = DIV_ROUND_CLOSEST(freq, (sr *
+					      (1 << (2 * c + 1)) * bps)) - 1;
+			br = clamp(br, 0, 255);
+			err = DIV_ROUND_CLOSEST(freq, ((br + 1) * bps * sr *
+					       (1 << (2 * c + 1)) / 1000)) -
+					       1000;
+			if (err < 0)
 				continue;
-			err = freq / ((br + 1) * bps * sr *
-			      (1 << (2 * c + 1)) / 1000) - 1000;
+
+			/* Calc recv margin
+			 * M: Receive margin (%)
+			 * N: Ratio of bit rate to clock (N = sampling rate)
+			 * D: Clock duty (D = 0 to 1.0)
+			 * L: Frame length (L = 9 to 12)
+			 * F: Absolute value of clock frequency deviation
+			 *
+			 *  M = |(0.5 - 1 / 2 * N) - ((L - 0.5) * F) -
+			 *      (|D - 0.5| / N * (1 + F))|
+			 *  NOTE: Usually, treat D for 0.5, F is 0 by this
+			 *        calculation.
+			 */
+			recv_margin = abs((500 -
+					DIV_ROUND_CLOSEST(1000, sr << 1)) / 10);
 			if (min_err > err) {
 				min_err = err;
-				*brr = br;
-				*srr = sr - 1;
-				*cks = c;
-			}
+				recv_max_margin = recv_margin;
+			} else if ((min_err == err) &&
+				   (recv_margin > recv_max_margin))
+				recv_max_margin = recv_margin;
+			else
+				continue;
+
+			*brr = br;
+			*srr = sr - 1;
+			*cks = c;
 		}
 	}
 
@@ -1840,10 +1874,19 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 {
 	struct sci_port *s = to_sci_port(port);
 	struct plat_sci_reg *reg;
-	unsigned int baud, smr_val, max_baud, cks = 0;
+	unsigned int baud, smr_val = 0, max_baud, cks = 0;
 	int t = -1;
 	unsigned int srr = 15;
 
+	if ((termios->c_cflag & CSIZE) == CS7)
+		smr_val |= SCSMR_CHR;
+	if (termios->c_cflag & PARENB)
+		smr_val |= SCSMR_PE;
+	if (termios->c_cflag & PARODD)
+		smr_val |= SCSMR_PE | SCSMR_ODD;
+	if (termios->c_cflag & CSTOPB)
+		smr_val |= SCSMR_STOP;
+
 	/*
 	 * earlyprintk comes here early on with port->uartclk set to zero.
 	 * the clock framework is not up and running at this point so here
@@ -1857,8 +1900,9 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 	baud = uart_get_baud_rate(port, termios, old, 0, max_baud);
 	if (likely(baud && port->uartclk)) {
 		if (s->cfg->type == PORT_HSCIF) {
+			int frame_len = sci_baud_calc_frame_len(smr_val);
 			sci_baud_calc_hscif(baud, port->uartclk, &t, &srr,
-					    &cks);
+					    &cks, frame_len);
 		} else {
 			t = sci_scbrr_calc(s, baud, port->uartclk);
 			for (cks = 0; t >= 256 && cks <= 3; cks++)
@@ -1870,16 +1914,7 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	sci_reset(port);
 
-	smr_val = serial_port_in(port, SCSMR) & 3;
-
-	if ((termios->c_cflag & CSIZE) == CS7)
-		smr_val |= SCSMR_CHR;
-	if (termios->c_cflag & PARENB)
-		smr_val |= SCSMR_PE;
-	if (termios->c_cflag & PARODD)
-		smr_val |= SCSMR_PE | SCSMR_ODD;
-	if (termios->c_cflag & CSTOPB)
-		smr_val |= SCSMR_STOP;
+	smr_val |= serial_port_in(port, SCSMR) & 3;
 
 	uart_update_timeout(port, termios->c_cflag, baud);
 
@@ -2080,7 +2115,6 @@ static struct uart_ops sci_uart_ops = {
 	.start_tx	= sci_start_tx,
 	.stop_tx	= sci_stop_tx,
 	.stop_rx	= sci_stop_rx,
-	.enable_ms	= sci_enable_ms,
 	.break_ctl	= sci_break_ctl,
 	.startup	= sci_startup,
 	.shutdown	= sci_shutdown,
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 9b4d71cff00d..4102192687ee 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -290,7 +290,8 @@ static void sirfsoc_uart_start_tx(struct uart_port *port)
 	if (sirfport->tx_dma_chan)
 		sirfsoc_uart_tx_with_dma(sirfport);
 	else {
-		sirfsoc_uart_pio_tx_chars(sirfport, 1);
+		sirfsoc_uart_pio_tx_chars(sirfport,
+			SIRFSOC_UART_IO_TX_REASONABLE_CNT);
 		wr_regl(port, ureg->sirfsoc_tx_fifo_op, SIRFUART_FIFO_START);
 		if (!sirfport->is_marco)
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
index 69a62ebd3afc..6a7ebf7ef130 100644
--- a/drivers/tty/serial/sirfsoc_uart.h
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -449,4 +449,4 @@ struct sirfsoc_uart_port {
 
 /* I/O Mode */
 #define SIRFSOC_UART_IO_RX_MAX_CNT		256
-#define SIRFSOC_UART_IO_TX_REASONABLE_CNT	6
+#define SIRFSOC_UART_IO_TX_REASONABLE_CNT	256
diff --git a/drivers/tty/serial/sn_console.c b/drivers/tty/serial/sn_console.c
index f51ffdc696fd..33e94e56dcdb 100644
--- a/drivers/tty/serial/sn_console.c
+++ b/drivers/tty/serial/sn_console.c
@@ -275,15 +275,6 @@ static void snp_release_port(struct uart_port *port)
 }
 
 /**
- * snp_enable_ms - Force modem status interrupts on - no-op for us
- * @port: Port to operate on - we ignore - no-op function
- *
- */
-static void snp_enable_ms(struct uart_port *port)
-{
-}
-
-/**
  * snp_shutdown - shut down the port - free irq and disable - no-op for us
  * @port: Port to shut down - we ignore
  *
@@ -396,7 +387,6 @@ static struct uart_ops sn_console_ops = {
 	.stop_tx = snp_stop_tx,
 	.start_tx = snp_start_tx,
 	.stop_rx = snp_stop_rx,
-	.enable_ms = snp_enable_ms,
 	.break_ctl = snp_break_ctl,
 	.startup = snp_startup,
 	.shutdown = snp_shutdown,
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index f48b1cc07eea..8b2d7356611d 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -411,12 +411,6 @@ static void asc_stop_rx(struct uart_port *port)
 	asc_disable_rx_interrupts(port);
 }
 
-/* Force modem status interrupts on */
-static void asc_enable_ms(struct uart_port *port)
-{
-	/* Nothing here yet .. */
-}
-
 /* Handle breaks - ignored by us */
 static void asc_break_ctl(struct uart_port *port, int break_state)
 {
@@ -533,12 +527,12 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios,
 		 * ASCBaudRate =   ------------------------
 		 *                          inputclock
 		 *
-		 * However to keep the maths inside 32bits we divide top and
-		 * bottom by 64. The +1 is to avoid a divide by zero if the
-		 * input clock rate is something unexpected.
+		 * To keep maths inside 64bits, we divide inputclock by 16.
 		 */
-		u32 counter = (baud * 16384) / ((port->uartclk / 64) + 1);
-		asc_out(port, ASC_BAUDRATE, counter);
+		u64 dividend = (u64)baud * (1 << 16);
+
+		do_div(dividend, port->uartclk / 16);
+		asc_out(port, ASC_BAUDRATE, dividend);
 		ctrl_val |= ASC_CTL_BAUDMODE;
 	}
 
@@ -644,7 +638,6 @@ static struct uart_ops asc_uart_ops = {
 	.start_tx	= asc_start_tx,
 	.stop_tx	= asc_stop_tx,
 	.stop_rx	= asc_stop_rx,
-	.enable_ms	= asc_enable_ms,
 	.break_ctl	= asc_break_ctl,
 	.startup	= asc_startup,
 	.shutdown	= asc_shutdown,
@@ -849,7 +842,8 @@ static int asc_console_setup(struct console *co, char *options)
 	 * this to be called during the uart port registration when the
 	 * driver gets probed and the port should be mapped at that point.
 	 */
-	BUG_ON(ascport->port.mapbase == 0 || ascport->port.membase == NULL);
+	if (ascport->port.mapbase == 0 || ascport->port.membase == NULL)
+		return -ENXIO;
 
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
diff --git a/drivers/tty/serial/sunhv.c b/drivers/tty/serial/sunhv.c
index dc697cee248a..20521db2189f 100644
--- a/drivers/tty/serial/sunhv.c
+++ b/drivers/tty/serial/sunhv.c
@@ -285,11 +285,6 @@ static void sunhv_stop_rx(struct uart_port *port)
 {
 }
 
-/* port->lock held by caller.  */
-static void sunhv_enable_ms(struct uart_port *port)
-{
-}
-
 /* port->lock is not held.  */
 static void sunhv_break_ctl(struct uart_port *port, int break_state)
 {
@@ -379,7 +374,6 @@ static struct uart_ops sunhv_pops = {
 	.start_tx	= sunhv_start_tx,
 	.send_xchar	= sunhv_send_xchar,
 	.stop_rx	= sunhv_stop_rx,
-	.enable_ms	= sunhv_enable_ms,
 	.break_ctl	= sunhv_break_ctl,
 	.startup	= sunhv_startup,
 	.shutdown	= sunhv_shutdown,
diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
index 2f57df9a71d9..bb09920ac9c7 100644
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -476,12 +476,6 @@ static void sunsab_stop_rx(struct uart_port *port)
 	writeb(up->interrupt_mask1, &up->regs->w.imr0);
 }
 
-/* port->lock held by caller.  */
-static void sunsab_enable_ms(struct uart_port *port)
-{
-	/* For now we always receive these interrupts.  */
-}
-
 /* port->lock is not held.  */
 static void sunsab_break_ctl(struct uart_port *port, int break_state)
 {
@@ -810,7 +804,6 @@ static struct uart_ops sunsab_pops = {
 	.start_tx	= sunsab_start_tx,
 	.send_xchar	= sunsab_send_xchar,
 	.stop_rx	= sunsab_stop_rx,
-	.enable_ms	= sunsab_enable_ms,
 	.break_ctl	= sunsab_break_ctl,
 	.startup	= sunsab_startup,
 	.shutdown	= sunsab_shutdown,
diff --git a/drivers/tty/serial/tilegx.c b/drivers/tty/serial/tilegx.c
index 613ccf09dc2a..453215f5420d 100644
--- a/drivers/tty/serial/tilegx.c
+++ b/drivers/tty/serial/tilegx.c
@@ -314,15 +314,6 @@ static void tilegx_stop_rx(struct uart_port *port)
 	mutex_unlock(&tile_uart->mutex);
 }
 
-
-/*
- * Enable modem status interrupts.
- */
-static void tilegx_enable_ms(struct uart_port *port)
-{
-	/* N/A */
-}
-
 /*
  * Control the transmission of a break signal.
  */
@@ -614,7 +605,6 @@ static const struct uart_ops tilegx_ops = {
 	.stop_tx	= tilegx_stop_tx,
 	.start_tx	= tilegx_start_tx,
 	.stop_rx	= tilegx_stop_rx,
-	.enable_ms	= tilegx_enable_ms,
 	.break_ctl	= tilegx_break_ctl,
 	.startup	= tilegx_startup,
 	.shutdown	= tilegx_shutdown,
diff --git a/drivers/tty/serial/timbuart.c b/drivers/tty/serial/timbuart.c
index f87097acd8ab..0d11d5032b93 100644
--- a/drivers/tty/serial/timbuart.c
+++ b/drivers/tty/serial/timbuart.c
@@ -244,11 +244,6 @@ static void timbuart_mctrl_check(struct uart_port *port, u32 isr, u32 *ier)
 	*ier |= CTS_DELTA;
 }
 
-static void timbuart_enable_ms(struct uart_port *port)
-{
-	/* N/A */
-}
-
 static void timbuart_break_ctl(struct uart_port *port, int ctl)
 {
 	/* N/A */
@@ -405,7 +400,6 @@ static struct uart_ops timbuart_ops = {
 	.start_tx = timbuart_start_tx,
 	.flush_buffer = timbuart_flush_buffer,
 	.stop_rx = timbuart_stop_rx,
-	.enable_ms = timbuart_enable_ms,
 	.break_ctl = timbuart_break_ctl,
 	.startup = timbuart_startup,
 	.shutdown = timbuart_shutdown,
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index dce27f34937e..9fc22f40796e 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -250,11 +250,6 @@ static void ulite_stop_rx(struct uart_port *port)
 		| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
 }
 
-static void ulite_enable_ms(struct uart_port *port)
-{
-	/* N/A */
-}
-
 static void ulite_break_ctl(struct uart_port *port, int ctl)
 {
 	/* N/A */
@@ -395,7 +390,6 @@ static struct uart_ops ulite_ops = {
 	.stop_tx	= ulite_stop_tx,
 	.start_tx	= ulite_start_tx,
 	.stop_rx	= ulite_stop_rx,
-	.enable_ms	= ulite_enable_ms,
 	.break_ctl	= ulite_break_ctl,
 	.startup	= ulite_startup,
 	.shutdown	= ulite_shutdown,
diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
index 1c52074c38df..c107a0f0e72f 100644
--- a/drivers/tty/serial/ucc_uart.c
+++ b/drivers/tty/serial/ucc_uart.c
@@ -435,16 +435,6 @@ static void qe_uart_stop_rx(struct uart_port *port)
 	clrbits16(&qe_port->uccp->uccm, UCC_UART_UCCE_RX);
 }
 
-/*
- * Enable status change interrupts
- *
- * We don't support status change interrupts, but we need to define this
- * function otherwise the kernel will panic.
- */
-static void qe_uart_enable_ms(struct uart_port *port)
-{
-}
-
 /* Start or stop sending  break signal
  *
  * This function controls the sending of a break signal.  If break_state=1,
@@ -1102,7 +1092,6 @@ static struct uart_ops qe_uart_pops = {
 	.stop_tx	= qe_uart_stop_tx,
 	.start_tx       = qe_uart_start_tx,
 	.stop_rx	= qe_uart_stop_rx,
-	.enable_ms      = qe_uart_enable_ms,
 	.break_ctl      = qe_uart_break_ctl,
 	.startup	= qe_uart_startup,
 	.shutdown       = qe_uart_shutdown,
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 8809775e2ba3..01951d27cc03 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -918,11 +918,6 @@ static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	/* N/A */
 }
 
-static void cdns_uart_enable_ms(struct uart_port *port)
-{
-	/* N/A */
-}
-
 #ifdef CONFIG_CONSOLE_POLL
 static int cdns_uart_poll_get_char(struct uart_port *port)
 {
@@ -974,7 +969,6 @@ static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c)
 static struct uart_ops cdns_uart_ops = {
 	.set_mctrl	= cdns_uart_set_mctrl,
 	.get_mctrl	= cdns_uart_get_mctrl,
-	.enable_ms	= cdns_uart_enable_ms,
 	.start_tx	= cdns_uart_start_tx,
 	.stop_tx	= cdns_uart_stop_tx,
 	.stop_rx	= cdns_uart_stop_rx,
diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index d48e040cd8c5..b7991707ffc0 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -3267,7 +3267,6 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
 	DECLARE_WAITQUEUE(wait, current);
 	int		retval;
 	bool		do_clocal = false;
-	bool		extra_count = false;
 	unsigned long	flags;
 	int		dcd;
 	struct tty_port *port = &info->port;
@@ -3300,10 +3299,7 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
 			 __FILE__,__LINE__, tty->driver->name, port->count );
 
 	spin_lock_irqsave(&info->irq_spinlock, flags);
-	if (!tty_hung_up_p(filp)) {
-		extra_count = true;
-		port->count--;
-	}
+	port->count--;
 	spin_unlock_irqrestore(&info->irq_spinlock, flags);
 	port->blocked_open++;
 	
@@ -3342,7 +3338,7 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
 	remove_wait_queue(&port->open_wait, &wait);
 	
 	/* FIXME: Racy on hangup during close wait */
-	if (extra_count)
+	if (!tty_hung_up_p(filp))
 		port->count++;
 	port->blocked_open--;
 	
@@ -3403,7 +3399,7 @@ static int mgsl_open(struct tty_struct *tty, struct file * filp)
 			 __FILE__,__LINE__,tty->driver->name, info->port.count);
 
 	/* If port is closing, signal caller to try again */
-	if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
+	if (info->port.flags & ASYNC_CLOSING){
 		wait_event_interruptible_tty(tty, info->port.close_wait,
 				     !(info->port.flags & ASYNC_CLOSING));
 		retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index c359a91f7346..ba1dbcdf4609 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -673,7 +673,7 @@ static int open(struct tty_struct *tty, struct file *filp)
 	DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
 
 	/* If port is closing, signal caller to try again */
-	if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
+	if (info->port.flags & ASYNC_CLOSING){
 		wait_event_interruptible_tty(tty, info->port.close_wait,
 					     !(info->port.flags & ASYNC_CLOSING));
 		retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
@@ -3273,7 +3273,6 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 	DECLARE_WAITQUEUE(wait, current);
 	int		retval;
 	bool		do_clocal = false;
-	bool		extra_count = false;
 	unsigned long	flags;
 	int		cd;
 	struct tty_port *port = &info->port;
@@ -3300,10 +3299,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 	add_wait_queue(&port->open_wait, &wait);
 
 	spin_lock_irqsave(&info->lock, flags);
-	if (!tty_hung_up_p(filp)) {
-		extra_count = true;
-		port->count--;
-	}
+	port->count--;
 	spin_unlock_irqrestore(&info->lock, flags);
 	port->blocked_open++;
 
@@ -3338,7 +3334,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 	set_current_state(TASK_RUNNING);
 	remove_wait_queue(&port->open_wait, &wait);
 
-	if (extra_count)
+	if (!tty_hung_up_p(filp))
 		port->count++;
 	port->blocked_open--;
 
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 53ba8537de8d..c3f90910fed9 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -753,7 +753,7 @@ static int open(struct tty_struct *tty, struct file *filp)
 			 __FILE__,__LINE__,tty->driver->name, info->port.count);
 
 	/* If port is closing, signal caller to try again */
-	if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
+	if (info->port.flags & ASYNC_CLOSING){
 		wait_event_interruptible_tty(tty, info->port.close_wait,
 					     !(info->port.flags & ASYNC_CLOSING));
 		retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
@@ -3288,7 +3288,6 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 	DECLARE_WAITQUEUE(wait, current);
 	int		retval;
 	bool		do_clocal = false;
-	bool		extra_count = false;
 	unsigned long	flags;
 	int		cd;
 	struct tty_port *port = &info->port;
@@ -3322,10 +3321,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 			 __FILE__,__LINE__, tty->driver->name, port->count );
 
 	spin_lock_irqsave(&info->lock, flags);
-	if (!tty_hung_up_p(filp)) {
-		extra_count = true;
-		port->count--;
-	}
+	port->count--;
 	spin_unlock_irqrestore(&info->lock, flags);
 	port->blocked_open++;
 
@@ -3362,8 +3358,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
 
 	set_current_state(TASK_RUNNING);
 	remove_wait_queue(&port->open_wait, &wait);
-
-	if (extra_count)
+	if (!tty_hung_up_p(filp))
 		port->count++;
 	port->blocked_open--;
 
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 34110719fe03..8fbad3410c75 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -157,20 +157,6 @@ static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
 static void proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
 
 /**
- *	alloc_tty_struct	-	allocate a tty object
- *
- *	Return a new empty tty structure. The data fields have not
- *	been initialized in any way but has been zeroed
- *
- *	Locking: none
- */
-
-struct tty_struct *alloc_tty_struct(void)
-{
-	return kzalloc(sizeof(struct tty_struct), GFP_KERNEL);
-}
-
-/**
  *	free_tty_struct		-	free a disused tty
  *	@tty: tty struct to free
  *
@@ -688,7 +674,7 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session)
 			for (n = 0; n < closecount; n++)
 				tty->ops->close(tty, cons_filp);
 	} else if (tty->ops->hangup)
-		(tty->ops->hangup)(tty);
+		tty->ops->hangup(tty);
 	/*
 	 * We don't want to have driver/ldisc interactions beyond
 	 * the ones we did here. The driver layer expects no
@@ -1455,12 +1441,11 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx)
 	if (!try_module_get(driver->owner))
 		return ERR_PTR(-ENODEV);
 
-	tty = alloc_tty_struct();
+	tty = alloc_tty_struct(driver, idx);
 	if (!tty) {
 		retval = -ENOMEM;
 		goto err_module_put;
 	}
-	initialize_tty_struct(tty, driver, idx);
 
 	tty_lock(tty);
 	retval = tty_driver_install_tty(driver, tty);
@@ -3003,19 +2988,21 @@ static struct device *tty_get_device(struct tty_struct *tty)
 
 
 /**
- *	initialize_tty_struct
- *	@tty: tty to initialize
+ *	alloc_tty_struct
  *
- *	This subroutine initializes a tty structure that has been newly
- *	allocated.
+ *	This subroutine allocates and initializes a tty structure.
  *
- *	Locking: none - tty in question must not be exposed at this point
+ *	Locking: none - tty in question is not exposed at this point
  */
 
-void initialize_tty_struct(struct tty_struct *tty,
-		struct tty_driver *driver, int idx)
+struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx)
 {
-	memset(tty, 0, sizeof(struct tty_struct));
+	struct tty_struct *tty;
+
+	tty = kzalloc(sizeof(*tty), GFP_KERNEL);
+	if (!tty)
+		return NULL;
+
 	kref_init(&tty->kref);
 	tty->magic = TTY_MAGIC;
 	tty_ldisc_init(tty);
@@ -3039,6 +3026,8 @@ void initialize_tty_struct(struct tty_struct *tty,
 	tty->index = idx;
 	tty_line_name(driver, idx, tty->name);
 	tty->dev = tty_get_device(tty);
+
+	return tty;
 }
 
 /**
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 3f746c8eb0dd..1b9335796da4 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -227,6 +227,8 @@ out:
  *
  *	Perform port level tty hangup flag and count changes. Drop the tty
  *	reference.
+ *
+ *	Caller holds tty lock.
  */
 
 void tty_port_hangup(struct tty_port *port)
@@ -348,6 +350,11 @@ EXPORT_SYMBOL(tty_port_lower_dtr_rts);
  *	do carrier detect and the dtr_rts method if it supports software
  *	management of these lines. Note that the dtr/rts raise is done each
  *	iteration as a hangup may have previously dropped them while we wait.
+ *
+ *	Caller holds tty lock.
+ *
+ *      NB: May drop and reacquire tty lock when blocking, so tty and tty_port
+ *      may have changed state (eg., may have been hung up).
  */
 
 int tty_port_block_til_ready(struct tty_port *port,
@@ -358,7 +365,7 @@ int tty_port_block_til_ready(struct tty_port *port,
 	DEFINE_WAIT(wait);
 
 	/* block if port is in the process of being closed */
-	if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
+	if (port->flags & ASYNC_CLOSING) {
 		wait_event_interruptible_tty(tty, port->close_wait,
 				!(port->flags & ASYNC_CLOSING));
 		if (port->flags & ASYNC_HUP_NOTIFY)
@@ -392,8 +399,7 @@ int tty_port_block_til_ready(struct tty_port *port,
 
 	/* The port lock protects the port counts */
 	spin_lock_irqsave(&port->lock, flags);
-	if (!tty_hung_up_p(filp))
-		port->count--;
+	port->count--;
 	port->blocked_open++;
 	spin_unlock_irqrestore(&port->lock, flags);
 
@@ -458,6 +464,10 @@ static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)
 	schedule_timeout_interruptible(timeout);
 }
 
+/* Caller holds tty lock.
+ * NB: may drop and reacquire tty lock (in tty_wait_until_sent_from_close())
+ * so tty and tty port may have changed state (but not hung up or reopened).
+ */
 int tty_port_close_start(struct tty_port *port,
 				struct tty_struct *tty, struct file *filp)
 {
@@ -486,9 +496,10 @@ int tty_port_close_start(struct tty_port *port,
 		return 0;
 	}
 	set_bit(ASYNCB_CLOSING, &port->flags);
-	tty->closing = 1;
 	spin_unlock_irqrestore(&port->lock, flags);
 
+	tty->closing = 1;
+
 	if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
 		/* Don't block on a stalled port, just pull the chain */
 		if (tty->flow_stopped)
@@ -506,13 +517,15 @@ int tty_port_close_start(struct tty_port *port,
 }
 EXPORT_SYMBOL(tty_port_close_start);
 
+/* Caller holds tty lock */
 void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&port->lock, flags);
 	tty->closing = 0;
 
+	spin_lock_irqsave(&port->lock, flags);
+
 	if (port->blocked_open) {
 		spin_unlock_irqrestore(&port->lock, flags);
 		if (port->close_delay) {
@@ -528,6 +541,15 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
 }
 EXPORT_SYMBOL(tty_port_close_end);
 
+/**
+ * tty_port_close
+ *
+ * Caller holds tty lock
+ *
+ * NB: may drop and reacquire tty lock (in tty_port_close_start()->
+ * tty_wait_until_sent_from_close()) so tty and tty_port may have changed
+ * state (but not hung up or reopened).
+ */
 void tty_port_close(struct tty_port *port, struct tty_struct *tty,
 							struct file *filp)
 {
@@ -558,12 +580,19 @@ int tty_port_install(struct tty_port *port, struct tty_driver *driver,
 }
 EXPORT_SYMBOL_GPL(tty_port_install);
 
+/**
+ * tty_port_open
+ *
+ * Caller holds tty lock.
+ *
+ * NB: may drop and reacquire tty lock (in tty_port_block_til_ready()) so
+ * tty and tty_port may have changed state (eg., may be hung up now)
+ */
 int tty_port_open(struct tty_port *port, struct tty_struct *tty,
 							struct file *filp)
 {
 	spin_lock_irq(&port->lock);
-	if (!tty_hung_up_p(filp))
-		++port->count;
+	++port->count;
 	spin_unlock_irq(&port->lock);
 	tty_port_tty_set(port, tty);