Merge branch 'next' (accumulated 3.16 merge window patches) into master

Now that 3.15 is released, this merges the 'next' branch into 'master',
bringing us to the normal situation where my 'master' branch is the
merge window.

* accumulated work in next: (6809 commits)
  ufs: sb mutex merge + mutex_destroy
  powerpc: update comments for generic idle conversion
  cris: update comments for generic idle conversion
  idle: remove cpu_idle() forward declarations
  nbd: zero from and len fields in NBD_CMD_DISCONNECT.
  mm: convert some level-less printks to pr_*
  MAINTAINERS: adi-buildroot-devel is moderated
  MAINTAINERS: add linux-api for review of API/ABI changes
  mm/kmemleak-test.c: use pr_fmt for logging
  fs/dlm/debug_fs.c: replace seq_printf by seq_puts
  fs/dlm/lockspace.c: convert simple_str to kstr
  fs/dlm/config.c: convert simple_str to kstr
  mm: mark remap_file_pages() syscall as deprecated
  mm: memcontrol: remove unnecessary memcg argument from soft limit functions
  mm: memcontrol: clean up memcg zoneinfo lookup
  mm/memblock.c: call kmemleak directly from memblock_(alloc|free)
  mm/mempool.c: update the kmemleak stack trace for mempool allocations
  lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations
  mm: introduce kmemleak_update_trace()
  mm/kmemleak.c: use %u to print ->checksum
  ...

48 files changed, 3934 insertions, 1189 deletions

diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c
index 75dc9d2..09495f5 100644
--- a/drivers/tty/goldfish.c
+++ b/drivers/tty/goldfish.c
@@ -21,6 +21,7 @@
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/goldfish.h>
 
 enum {
 	GOLDFISH_TTY_PUT_CHAR       = 0x00,
@@ -29,6 +30,7 @@ enum {
 
 	GOLDFISH_TTY_DATA_PTR       = 0x10,
 	GOLDFISH_TTY_DATA_LEN       = 0x14,
+	GOLDFISH_TTY_DATA_PTR_HIGH  = 0x18,
 
 	GOLDFISH_TTY_CMD_INT_DISABLE    = 0,
 	GOLDFISH_TTY_CMD_INT_ENABLE     = 1,
@@ -57,7 +59,8 @@ static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
 	struct goldfish_tty *qtty = &goldfish_ttys[line];
 	void __iomem *base = qtty->base;
 	spin_lock_irqsave(&qtty->lock, irq_flags);
-	writel((u32)buf, base + GOLDFISH_TTY_DATA_PTR);
+	gf_write64((u64)buf, base + GOLDFISH_TTY_DATA_PTR,
+				base + GOLDFISH_TTY_DATA_PTR_HIGH);
 	writel(count, base + GOLDFISH_TTY_DATA_LEN);
 	writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
 	spin_unlock_irqrestore(&qtty->lock, irq_flags);
@@ -73,12 +76,13 @@ static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
 	u32 count;
 
 	count = readl(base + GOLDFISH_TTY_BYTES_READY);
-	if(count == 0)
+	if (count == 0)
 		return IRQ_NONE;
 
 	count = tty_prepare_flip_string(&qtty->port, &buf, count);
 	spin_lock_irqsave(&qtty->lock, irq_flags);
-	writel((u32)buf, base + GOLDFISH_TTY_DATA_PTR);
+	gf_write64((u64)buf, base + GOLDFISH_TTY_DATA_PTR,
+				base + GOLDFISH_TTY_DATA_PTR_HIGH);
 	writel(count, base + GOLDFISH_TTY_DATA_LEN);
 	writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
 	spin_unlock_irqrestore(&qtty->lock, irq_flags);
@@ -88,24 +92,26 @@ static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
 
 static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty)
 {
-	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, port);
+	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
+									port);
 	writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
 	return 0;
 }
 
 static void goldfish_tty_shutdown(struct tty_port *port)
 {
-	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty, port);
+	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
+									port);
 	writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
 }
 
-static int goldfish_tty_open(struct tty_struct * tty, struct file * filp)
+static int goldfish_tty_open(struct tty_struct *tty, struct file *filp)
 {
 	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
 	return tty_port_open(&qtty->port, tty, filp);
 }
 
-static void goldfish_tty_close(struct tty_struct * tty, struct file * filp)
+static void goldfish_tty_close(struct tty_struct *tty, struct file *filp)
 {
 	tty_port_close(tty->port, tty, filp);
 }
@@ -115,7 +121,8 @@ static void goldfish_tty_hangup(struct tty_struct *tty)
 	tty_port_hangup(tty->port);
 }
 
-static int goldfish_tty_write(struct tty_struct * tty, const unsigned char *buf, int count)
+static int goldfish_tty_write(struct tty_struct *tty, const unsigned char *buf,
+								int count)
 {
 	goldfish_tty_do_write(tty->index, buf, count);
 	return count;
@@ -133,12 +140,14 @@ static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
 	return readl(base + GOLDFISH_TTY_BYTES_READY);
 }
 
-static void goldfish_tty_console_write(struct console *co, const char *b, unsigned count)
+static void goldfish_tty_console_write(struct console *co, const char *b,
+								unsigned count)
 {
 	goldfish_tty_do_write(co->index, b, count);
 }
 
-static struct tty_driver *goldfish_tty_console_device(struct console *c, int *index)
+static struct tty_driver *goldfish_tty_console_device(struct console *c,
+								int *index)
 {
 	*index = c->index;
 	return goldfish_tty_driver;
@@ -146,9 +155,9 @@ static struct tty_driver *goldfish_tty_console_device(struct console *c, int *in
 
 static int goldfish_tty_console_setup(struct console *co, char *options)
 {
-	if((unsigned)co->index > goldfish_tty_line_count)
+	if ((unsigned)co->index > goldfish_tty_line_count)
 		return -ENODEV;
-	if(goldfish_ttys[co->index].base == 0)
+	if (goldfish_ttys[co->index].base == 0)
 		return -ENODEV;
 	return 0;
 }
@@ -158,7 +167,7 @@ static struct tty_port_operations goldfish_port_ops = {
 	.shutdown = goldfish_tty_shutdown
 };
 
-static struct tty_operations goldfish_tty_ops = {
+static const struct tty_operations goldfish_tty_ops = {
 	.open = goldfish_tty_open,
 	.close = goldfish_tty_close,
 	.hangup = goldfish_tty_hangup,
@@ -172,13 +181,14 @@ static int goldfish_tty_create_driver(void)
 	int ret;
 	struct tty_driver *tty;
 
-	goldfish_ttys = kzalloc(sizeof(*goldfish_ttys) * goldfish_tty_line_count, GFP_KERNEL);
-	if(goldfish_ttys == NULL) {
+	goldfish_ttys = kzalloc(sizeof(*goldfish_ttys) *
+				goldfish_tty_line_count, GFP_KERNEL);
+	if (goldfish_ttys == NULL) {
 		ret = -ENOMEM;
 		goto err_alloc_goldfish_ttys_failed;
 	}
 	tty = alloc_tty_driver(goldfish_tty_line_count);
-	if(tty == NULL) {
+	if (tty == NULL) {
 		ret = -ENOMEM;
 		goto err_alloc_tty_driver_failed;
 	}
@@ -187,10 +197,11 @@ static int goldfish_tty_create_driver(void)
 	tty->type = TTY_DRIVER_TYPE_SERIAL;
 	tty->subtype = SERIAL_TYPE_NORMAL;
 	tty->init_termios = tty_std_termios;
-	tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+	tty->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
+						TTY_DRIVER_DYNAMIC_DEV;
 	tty_set_operations(tty, &goldfish_tty_ops);
 	ret = tty_register_driver(tty);
-	if(ret)
+	if (ret)
 		goto err_tty_register_driver_failed;
 
 	goldfish_tty_driver = tty;
@@ -225,7 +236,7 @@ static int goldfish_tty_probe(struct platform_device *pdev)
 	u32 irq;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if(r == NULL)
+	if (r == NULL)
 		return -EINVAL;
 
 	base = ioremap(r->start, 0x1000);
@@ -233,18 +244,18 @@ static int goldfish_tty_probe(struct platform_device *pdev)
 		pr_err("goldfish_tty: unable to remap base\n");
 
 	r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if(r == NULL)
+	if (r == NULL)
 		goto err_unmap;
 
 	irq = r->start;
 
-	if(pdev->id >= goldfish_tty_line_count)
+	if (pdev->id >= goldfish_tty_line_count)
 		goto err_unmap;
 
 	mutex_lock(&goldfish_tty_lock);
-	if(goldfish_tty_current_line_count == 0) {
+	if (goldfish_tty_current_line_count == 0) {
 		ret = goldfish_tty_create_driver();
-		if(ret)
+		if (ret)
 			goto err_create_driver_failed;
 	}
 	goldfish_tty_current_line_count++;
@@ -258,14 +269,15 @@ static int goldfish_tty_probe(struct platform_device *pdev)
 
 	writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
 
-	ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED, "goldfish_tty", pdev);
-	if(ret)
+	ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
+						"goldfish_tty", pdev);
+	if (ret)
 		goto err_request_irq_failed;
 
 
 	ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
 							pdev->id, &pdev->dev);
-	if(IS_ERR(ttydev)) {
+	if (IS_ERR(ttydev)) {
 		ret = PTR_ERR(ttydev);
 		goto err_tty_register_device_failed;
 	}
@@ -286,7 +298,7 @@ err_tty_register_device_failed:
 	free_irq(irq, pdev);
 err_request_irq_failed:
 	goldfish_tty_current_line_count--;
-	if(goldfish_tty_current_line_count == 0)
+	if (goldfish_tty_current_line_count == 0)
 		goldfish_tty_delete_driver();
 err_create_driver_failed:
 	mutex_unlock(&goldfish_tty_lock);
@@ -308,7 +320,7 @@ static int goldfish_tty_remove(struct platform_device *pdev)
 	qtty->base = 0;
 	free_irq(qtty->irq, pdev);
 	goldfish_tty_current_line_count--;
-	if(goldfish_tty_current_line_count == 0)
+	if (goldfish_tty_current_line_count == 0)
 		goldfish_tty_delete_driver();
 	mutex_unlock(&goldfish_tty_lock);
 	return 0;
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index 0ff7fda..4fcec1d 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -760,10 +760,17 @@ static int khvcd(void *unused)
 			if (poll_mask == 0)
 				schedule();
 			else {
+				unsigned long j_timeout;
+
 				if (timeout < MAX_TIMEOUT)
 					timeout += (timeout >> 6) + 1;
 
-				msleep_interruptible(timeout);
+				/*
+				 * We don't use msleep_interruptible otherwise
+				 * "kick" will fail to wake us up
+				 */
+				j_timeout = msecs_to_jiffies(timeout) + 1;
+				schedule_timeout_interruptible(j_timeout);
 			}
 		}
 		__set_current_state(TASK_RUNNING);
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
index 3502a7b..809920d 100644
--- a/drivers/tty/hvc/hvc_dcc.c
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+/* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -8,20 +8,11 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
  */
 
-#include <linux/console.h>
-#include <linux/delay.h>
-#include <linux/err.h>
 #include <linux/init.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
 
+#include <asm/dcc.h>
 #include <asm/processor.h>
 
 #include "hvc_console.h"
@@ -30,35 +21,6 @@
 #define DCC_STATUS_RX		(1 << 30)
 #define DCC_STATUS_TX		(1 << 29)
 
-static inline u32 __dcc_getstatus(void)
-{
-	u32 __ret;
-	asm volatile("mrc p14, 0, %0, c0, c1, 0	@ read comms ctrl reg"
-		: "=r" (__ret) : : "cc");
-
-	return __ret;
-}
-
-
-static inline char __dcc_getchar(void)
-{
-	char __c;
-
-	asm volatile("mrc p14, 0, %0, c0, c5, 0	@ read comms data reg"
-		: "=r" (__c));
-	isb();
-
-	return __c;
-}
-
-static inline void __dcc_putchar(char c)
-{
-	asm volatile("mcr p14, 0, %0, c0, c5, 0	@ write a char"
-		: /* no output register */
-		: "r" (c));
-	isb();
-}
-
 static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
 {
 	int i;
diff --git a/drivers/tty/hvc/hvc_tile.c b/drivers/tty/hvc/hvc_tile.c
index af8cdaa..147d49e 100644
--- a/drivers/tty/hvc/hvc_tile.c
+++ b/drivers/tty/hvc/hvc_tile.c
@@ -133,14 +133,14 @@ static int hvc_tile_probe(struct platform_device *pdev)
 	int tile_hvc_irq;
 
 	/* Create our IRQ and register it. */
-	tile_hvc_irq = create_irq();
-	if (tile_hvc_irq < 0)
+	tile_hvc_irq = irq_alloc_hwirq(-1);
+	if (!tile_hvc_irq)
 		return -ENXIO;
 
 	tile_irq_activate(tile_hvc_irq, TILE_IRQ_PERCPU);
 	hp = hvc_alloc(0, tile_hvc_irq, &hvc_tile_get_put_ops, 128);
 	if (IS_ERR(hp)) {
-		destroy_irq(tile_hvc_irq);
+		irq_free_hwirq(tile_hvc_irq);
 		return PTR_ERR(hp);
 	}
 	dev_set_drvdata(&pdev->dev, hp);
@@ -155,7 +155,7 @@ static int hvc_tile_remove(struct platform_device *pdev)
 
 	rc = hvc_remove(hp);
 	if (rc == 0)
-		destroy_irq(hp->data);
+		irq_free_hwirq(hp->data);
 
 	return rc;
 }
diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
index 1b2db9a..644ddb8 100644
--- a/drivers/tty/n_hdlc.c
+++ b/drivers/tty/n_hdlc.c
@@ -848,13 +848,11 @@ static struct n_hdlc *n_hdlc_alloc(void)
 {
 	struct n_hdlc_buf *buf;
 	int i;
-	struct n_hdlc *n_hdlc = kmalloc(sizeof(*n_hdlc), GFP_KERNEL);
+	struct n_hdlc *n_hdlc = kzalloc(sizeof(*n_hdlc), GFP_KERNEL);
 
 	if (!n_hdlc)
 		return NULL;
 
-	memset(n_hdlc, 0, sizeof(*n_hdlc));
-
 	n_hdlc_buf_list_init(&n_hdlc->rx_free_buf_list);
 	n_hdlc_buf_list_init(&n_hdlc->tx_free_buf_list);
 	n_hdlc_buf_list_init(&n_hdlc->rx_buf_list);
@@ -952,8 +950,6 @@ static char hdlc_register_ok[] __initdata =
 	KERN_INFO "N_HDLC line discipline registered.\n";
 static char hdlc_register_fail[] __initdata =
 	KERN_ERR "error registering line discipline: %d\n";
-static char hdlc_init_fail[] __initdata =
-	KERN_INFO "N_HDLC: init failure %d\n";
 
 static int __init n_hdlc_init(void)
 {
@@ -973,8 +969,6 @@ static int __init n_hdlc_init(void)
 	else
 		printk(hdlc_register_fail, status);
 
-	if (status)
-		printk(hdlc_init_fail, status);
 	return status;
 	
 }	/* end of init_module() */
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index fe9d129..f95569d 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2041,7 +2041,7 @@ static int canon_copy_from_read_buf(struct tty_struct *tty,
 
 	if (found)
 		clear_bit(eol, ldata->read_flags);
-	smp_mb__after_clear_bit();
+	smp_mb__after_atomic();
 	ldata->read_tail += c;
 
 	if (found) {
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 2d4bd39..27f7ad6 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1926,13 +1926,8 @@ static void serial8250_put_poll_char(struct uart_port *port,
 	wait_for_xmitr(up, BOTH_EMPTY);
 	/*
 	 *	Send the character out.
-	 *	If a LF, also do CR...
 	 */
 	serial_port_out(port, UART_TX, c);
-	if (c == 10) {
-		wait_for_xmitr(up, BOTH_EMPTY);
-		serial_port_out(port, UART_TX, 13);
-	}
 
 	/*
 	 *	Finally, wait for transmitter to become empty
@@ -2338,9 +2333,11 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	 * the trigger, or the MCR RTS bit is cleared.  In the case where
 	 * the remote UART is not using CTS auto flow control, we must
 	 * have sufficient FIFO entries for the latency of the remote
-	 * UART to respond.  IOW, at least 32 bytes of FIFO.
+	 * UART to respond.  IOW, at least 32 bytes of FIFO. Also enable
+	 * AFE if hw flow control is supported
 	 */
-	if (up->capabilities & UART_CAP_AFE && port->fifosize >= 32) {
+	if ((up->capabilities & UART_CAP_AFE && (port->fifosize >= 32)) ||
+	    (port->flags & UPF_HARD_FLOW)) {
 		up->mcr &= ~UART_MCR_AFE;
 		if (termios->c_cflag & CRTSCTS)
 			up->mcr |= UART_MCR_AFE;
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index ab9096d..148ffe4 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -192,21 +192,28 @@ int serial8250_request_dma(struct uart_8250_port *p)
 
 	dma->rx_buf = dma_alloc_coherent(dma->rxchan->device->dev, dma->rx_size,
 					&dma->rx_addr, GFP_KERNEL);
-	if (!dma->rx_buf) {
-		dma_release_channel(dma->rxchan);
-		dma_release_channel(dma->txchan);
-		return -ENOMEM;
-	}
+	if (!dma->rx_buf)
+		goto err;
 
 	/* TX buffer */
 	dma->tx_addr = dma_map_single(dma->txchan->device->dev,
 					p->port.state->xmit.buf,
 					UART_XMIT_SIZE,
 					DMA_TO_DEVICE);
+	if (dma_mapping_error(dma->txchan->device->dev, dma->tx_addr)) {
+		dma_free_coherent(dma->rxchan->device->dev, dma->rx_size,
+				  dma->rx_buf, dma->rx_addr);
+		goto err;
+	}
 
 	dev_dbg_ratelimited(p->port.dev, "got both dma channels\n");
 
 	return 0;
+err:
+	dma_release_channel(dma->rxchan);
+	dma_release_channel(dma->txchan);
+
+	return -ENOMEM;
 }
 EXPORT_SYMBOL_GPL(serial8250_request_dma);
 
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index ed31135..51b307a 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -62,6 +62,70 @@ struct dw8250_data {
 	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;
@@ -278,6 +342,7 @@ static int dw8250_probe_acpi(struct uart_8250_port *up,
 {
 	const struct acpi_device_id *id;
 	struct uart_port *p = &up->port;
+	struct dw8250_acpi_desc *acpi_desc;
 
 	dw8250_setup_port(up);
 
@@ -290,14 +355,18 @@ static int dw8250_probe_acpi(struct uart_8250_port *up,
 	p->serial_out = dw8250_serial_out32;
 	p->regshift = 2;
 
-	if (!p->uartclk)
-		p->uartclk = (unsigned int)id->driver_data;
-
 	up->dma = &data->dma;
 
 	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;
+
 	return 0;
 }
 
@@ -445,12 +514,16 @@ 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", 0 },
+	{ "80860F0A", (kernel_ulong_t)&byt_8250_desc},
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index c100d63..cfef801 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -35,18 +35,8 @@
 #include <linux/serial_8250.h>
 #include <asm/io.h>
 #include <asm/serial.h>
-#ifdef CONFIG_FIX_EARLYCON_MEM
-#include <asm/pgtable.h>
-#include <asm/fixmap.h>
-#endif
 
-struct early_serial8250_device {
-	struct uart_port port;
-	char options[16];		/* e.g., 115200n8 */
-	unsigned int baud;
-};
-
-static struct early_serial8250_device early_device;
+static struct earlycon_device *early_device;
 
 unsigned int __weak __init serial8250_early_in(struct uart_port *port, int offset)
 {
@@ -100,7 +90,7 @@ static void __init serial_putc(struct uart_port *port, int c)
 static void __init early_serial8250_write(struct console *console,
 					const char *s, unsigned int count)
 {
-	struct uart_port *port = &early_device.port;
+	struct uart_port *port = &early_device->port;
 	unsigned int ier;
 
 	/* Save the IER and disable interrupts */
@@ -129,7 +119,7 @@ static unsigned int __init probe_baud(struct uart_port *port)
 	return (port->uartclk / 16) / quot;
 }
 
-static void __init init_port(struct early_serial8250_device *device)
+static void __init init_port(struct earlycon_device *device)
 {
 	struct uart_port *port = &device->port;
 	unsigned int divisor;
@@ -148,128 +138,42 @@ static void __init init_port(struct early_serial8250_device *device)
 	serial8250_early_out(port, UART_LCR, c & ~UART_LCR_DLAB);
 }
 
-static int __init parse_options(struct early_serial8250_device *device,
-								char *options)
+static int __init early_serial8250_setup(struct earlycon_device *device,
+					 const char *options)
 {
-	struct uart_port *port = &device->port;
-	int mmio, mmio32, length;
-
-	if (!options)
-		return -ENODEV;
-
-	port->uartclk = BASE_BAUD * 16;
-
-	mmio = !strncmp(options, "mmio,", 5);
-	mmio32 = !strncmp(options, "mmio32,", 7);
-	if (mmio || mmio32) {
-		port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
-		port->mapbase = simple_strtoul(options + (mmio ? 5 : 7),
-					       &options, 0);
-		if (mmio32)
-			port->regshift = 2;
-#ifdef CONFIG_FIX_EARLYCON_MEM
-		set_fixmap_nocache(FIX_EARLYCON_MEM_BASE,
-					port->mapbase & PAGE_MASK);
-		port->membase =
-			(void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
-		port->membase += port->mapbase & ~PAGE_MASK;
-#else
-		port->membase = ioremap_nocache(port->mapbase, 64);
-		if (!port->membase) {
-			printk(KERN_ERR "%s: Couldn't ioremap 0x%llx\n",
-				__func__,
-			       (unsigned long long) port->mapbase);
-			return -ENOMEM;
-		}
-#endif
-	} else if (!strncmp(options, "io,", 3)) {
-		port->iotype = UPIO_PORT;
-		port->iobase = simple_strtoul(options + 3, &options, 0);
-		mmio = 0;
-	} else
-		return -EINVAL;
-
-	options = strchr(options, ',');
-	if (options) {
-		options++;
-		device->baud = simple_strtoul(options, NULL, 0);
-		length = min(strcspn(options, " ") + 1,
-			     (size_t)(sizeof(device->options)));
-		strlcpy(device->options, options, length);
-	} else {
-		device->baud = probe_baud(port);
-		snprintf(device->options, sizeof(device->options), "%u",
-			device->baud);
-	}
-
-	if (mmio || mmio32)
-		printk(KERN_INFO
-		       "Early serial console at MMIO%s 0x%llx (options '%s')\n",
-			mmio32 ? "32" : "",
-			(unsigned long long)port->mapbase,
-			device->options);
-	else
-		printk(KERN_INFO
-		      "Early serial console at I/O port 0x%lx (options '%s')\n",
-			port->iobase,
-			device->options);
-
-	return 0;
-}
-
-static struct console early_serial8250_console __initdata = {
-	.name	= "uart",
-	.write	= early_serial8250_write,
-	.flags	= CON_PRINTBUFFER | CON_BOOT,
-	.index	= -1,
-};
-
-static int __init early_serial8250_setup(char *options)
-{
-	struct early_serial8250_device *device = &early_device;
-	int err;
-
-	if (device->port.membase || device->port.iobase)
+	if (!(device->port.membase || device->port.iobase))
 		return 0;
 
-	err = parse_options(device, options);
-	if (err < 0)
-		return err;
+	if (!device->baud)
+		device->baud = probe_baud(&device->port);
 
 	init_port(device);
+
+	early_device = device;
+	device->con->write = early_serial8250_write;
 	return 0;
 }
+EARLYCON_DECLARE(uart8250, early_serial8250_setup);
+EARLYCON_DECLARE(uart, early_serial8250_setup);
 
 int __init setup_early_serial8250_console(char *cmdline)
 {
-	char *options;
-	int err;
+	char match[] = "uart8250";
 
-	options = strstr(cmdline, "uart8250,");
-	if (!options) {
-		options = strstr(cmdline, "uart,");
-		if (!options)
-			return 0;
-	}
+	if (cmdline && cmdline[4] == ',')
+		match[4] = '\0';
 
-	options = strchr(cmdline, ',') + 1;
-	err = early_serial8250_setup(options);
-	if (err < 0)
-		return err;
-
-	register_console(&early_serial8250_console);
-
-	return 0;
+	return setup_earlycon(cmdline, match, early_serial8250_setup);
 }
 
 int serial8250_find_port_for_earlycon(void)
 {
-	struct early_serial8250_device *device = &early_device;
-	struct uart_port *port = &device->port;
+	struct earlycon_device *device = early_device;
+	struct uart_port *port = device ? &device->port : NULL;
 	int line;
 	int ret;
 
-	if (!device->port.membase && !device->port.iobase)
+	if (!port || (!port->membase && !port->iobase))
 		return -ENODEV;
 
 	line = serial8250_find_port(port);
@@ -284,5 +188,3 @@ int serial8250_find_port_for_earlycon(void)
 
 	return ret;
 }
-
-early_param("earlycon", setup_early_serial8250_console);
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index b14bcba..33137b3 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1753,6 +1753,8 @@ pci_wch_ch353_setup(struct serial_private *priv,
 #define PCI_VENDOR_ID_ADVANTECH		0x13fe
 #define PCI_DEVICE_ID_INTEL_CE4100_UART 0x2e66
 #define PCI_DEVICE_ID_ADVANTECH_PCI3620	0x3620
+#define PCI_DEVICE_ID_ADVANTECH_PCI3618	0x3618
+#define PCI_DEVICE_ID_ADVANTECH_PCIf618	0xf618
 #define PCI_DEVICE_ID_TITAN_200I	0x8028
 #define PCI_DEVICE_ID_TITAN_400I	0x8048
 #define PCI_DEVICE_ID_TITAN_800I	0x8088
@@ -1778,6 +1780,7 @@ pci_wch_ch353_setup(struct serial_private *priv,
 #define PCI_DEVICE_ID_WCH_CH352_2S	0x3253
 #define PCI_DEVICE_ID_WCH_CH353_4S	0x3453
 #define PCI_DEVICE_ID_WCH_CH353_2S1PF	0x5046
+#define PCI_DEVICE_ID_WCH_CH353_1S1P	0x5053
 #define PCI_DEVICE_ID_WCH_CH353_2S1P	0x7053
 #define PCI_VENDOR_ID_AGESTAR		0x5372
 #define PCI_DEVICE_ID_AGESTAR_9375	0x6872
@@ -2410,6 +2413,14 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
 		.subdevice	= PCI_ANY_ID,
 		.setup		= pci_omegapci_setup,
 	},
+	/* WCH CH353 1S1P card (16550 clone) */
+	{
+		.vendor         = PCI_VENDOR_ID_WCH,
+		.device         = PCI_DEVICE_ID_WCH_CH353_1S1P,
+		.subvendor      = PCI_ANY_ID,
+		.subdevice      = PCI_ANY_ID,
+		.setup          = pci_wch_ch353_setup,
+	},
 	/* WCH CH353 2S1P card (16550 clone) */
 	{
 		.vendor         = PCI_VENDOR_ID_WCH,
@@ -3526,6 +3537,7 @@ static const struct pci_device_id blacklist[] = {
 
 	/* multi-io cards handled by parport_serial */
 	{ PCI_DEVICE(0x4348, 0x7053), }, /* WCH CH353 2S1P */
+	{ PCI_DEVICE(0x4348, 0x5053), }, /* WCH CH353 1S1P */
 };
 
 /*
@@ -3880,6 +3892,13 @@ static struct pci_device_id serial_pci_tbl[] = {
 	{	PCI_VENDOR_ID_ADVANTECH, PCI_DEVICE_ID_ADVANTECH_PCI3620,
 		PCI_DEVICE_ID_ADVANTECH_PCI3620, 0x0001, 0, 0,
 		pbn_b2_8_921600 },
+	/* Advantech also use 0x3618 and 0xf618 */
+	{	PCI_VENDOR_ID_ADVANTECH, PCI_DEVICE_ID_ADVANTECH_PCI3618,
+		PCI_DEVICE_ID_ADVANTECH_PCI3618, PCI_ANY_ID, 0, 0,
+		pbn_b0_4_921600 },
+	{	PCI_VENDOR_ID_ADVANTECH, PCI_DEVICE_ID_ADVANTECH_PCIf618,
+		PCI_DEVICE_ID_ADVANTECH_PCI3618, PCI_ANY_ID, 0, 0,
+		pbn_b0_4_921600 },
 	{	PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
 		PCI_SUBVENDOR_ID_CONNECT_TECH,
 		PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_232, 0, 0,
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 2332991..349ee59 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -61,6 +61,7 @@ config SERIAL_8250_CONSOLE
 	bool "Console on 8250/16550 and compatible serial port"
 	depends on SERIAL_8250=y
 	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 	---help---
 	  If you say Y here, it will be possible to use a serial port as the
 	  system console (the system console is the device which receives all
@@ -90,11 +91,6 @@ config SERIAL_8250_CONSOLE
 
 	  If unsure, say N.
 
-config FIX_EARLYCON_MEM
-	bool
-	depends on X86
-	default y
-
 config SERIAL_8250_GSC
 	tristate
 	depends on SERIAL_8250 && GSC
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 5d9b01a..fb57159 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -7,6 +7,13 @@ if TTY
 menu "Serial drivers"
 	depends on HAS_IOMEM
 
+config SERIAL_EARLYCON
+	bool
+	help
+	  Support for early consoles with the earlycon parameter. This enables
+	  the console before standard serial driver is probed. The console is
+	  enabled when early_param is processed.
+
 source "drivers/tty/serial/8250/Kconfig"
 
 comment "Non-8250 serial port support"
@@ -53,6 +60,7 @@ config SERIAL_AMBA_PL011_CONSOLE
 	bool "Support for console on AMBA serial port"
 	depends on SERIAL_AMBA_PL011=y
 	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 	---help---
 	  Say Y here if you wish to use an AMBA PrimeCell UART as the system
 	  console (the system console is the device which receives all kernel
@@ -65,6 +73,18 @@ config SERIAL_AMBA_PL011_CONSOLE
 	  your boot loader (lilo or loadlin) about how to pass options to the
 	  kernel at boot time.)
 
+config SERIAL_EARLYCON_ARM_SEMIHOST
+	bool "Early console using ARM semihosting"
+	depends on ARM64 || ARM
+	select SERIAL_CORE
+	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
+	help
+	  Support for early debug console using ARM semihosting. This enables
+	  the console before standard serial driver is probed. This is enabled
+	  with "earlycon=smh" on the kernel command line. The console is
+	  enabled when early_param is processed.
+
 config SERIAL_SB1250_DUART
 	tristate "BCM1xxx on-chip DUART serial support"
 	depends on SIBYTE_SB1xxx_SOC=y
@@ -97,6 +117,7 @@ config SERIAL_ATMEL
 	bool "AT91 / AT32 on-chip serial port support"
 	depends on ARCH_AT91 || AVR32
 	select SERIAL_CORE
+	select SERIAL_MCTRL_GPIO
 	help
 	  This enables the driver for the on-chip UARTs of the Atmel
 	  AT91 and AT32 processors.
@@ -1160,6 +1181,16 @@ config SERIAL_SCCNXP_CONSOLE
 	help
 	  Support for console on SCCNXP serial ports.
 
+config SERIAL_SC16IS7XX
+	tristate "SC16IS7xx serial support"
+	depends on I2C
+	select SERIAL_CORE
+	select REGMAP_I2C if I2C
+	help
+	  This selects support for SC16IS7xx serial ports.
+	  Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752,
+	  SC16IS760 and SC16IS762.
+
 config SERIAL_BFIN_SPORT
 	tristate "Blackfin SPORT emulate UART"
 	depends on BLACKFIN
@@ -1323,7 +1354,7 @@ config SERIAL_IFX6X60
 
 config SERIAL_PCH_UART
 	tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) UART"
-	depends on PCI
+	depends on PCI && (X86_32 || COMPILE_TEST)
 	select SERIAL_CORE
 	help
 	  This driver is for PCH(Platform controller Hub) UART of Intel EG20T
@@ -1369,18 +1400,19 @@ config SERIAL_MXS_AUART_CONSOLE
 	  Enable a MXS AUART port to be the system console.
 
 config SERIAL_XILINX_PS_UART
-	tristate "Xilinx PS UART support"
+	tristate "Cadence (Xilinx Zynq) UART support"
 	depends on OF
 	select SERIAL_CORE
 	help
-	  This driver supports the Xilinx PS UART port.
+	  This driver supports the Cadence UART. It is found e.g. in Xilinx
+	  Zynq.
 
 config SERIAL_XILINX_PS_UART_CONSOLE
-	bool "Xilinx PS UART console support"
+	bool "Cadence UART console support"
 	depends on SERIAL_XILINX_PS_UART=y
 	select SERIAL_CORE_CONSOLE
 	help
-	  Enable a Xilinx PS UART port to be the system console.
+	  Enable a Cadence UART port to be the system console.
 
 config SERIAL_AR933X
 	tristate "AR933X serial port support"
@@ -1479,6 +1511,7 @@ config SERIAL_RP2_NR_UARTS
 
 config SERIAL_FSL_LPUART
 	tristate "Freescale lpuart serial port support"
+	depends on HAS_DMA
 	select SERIAL_CORE
 	help
 	  Support for the on-chip lpuart on some Freescale SOCs.
@@ -1508,6 +1541,20 @@ config SERIAL_ST_ASC_CONSOLE
 	depends on SERIAL_ST_ASC=y
 	select SERIAL_CORE_CONSOLE
 
+config SERIAL_MEN_Z135
+	tristate "MEN 16z135 Support"
+	select SERIAL_CORE
+	depends on MCB
+	help
+	  Say yes here to enable support for the MEN 16z135 High Speed UART IP-Core
+	  on a MCB carrier.
+
+	  This driver can also be build as a module. If so, the module will be called
+	  men_z135_uart.ko
+
 endmenu
 
+config SERIAL_MCTRL_GPIO
+	tristate
+
 endif # TTY
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 3680854..0080cc3 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -5,6 +5,9 @@
 obj-$(CONFIG_SERIAL_CORE) += serial_core.o
 obj-$(CONFIG_SERIAL_21285) += 21285.o
 
+obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o
+obj-$(CONFIG_SERIAL_EARLYCON_ARM_SEMIHOST) += earlycon-arm-semihost.o
+
 # These Sparc drivers have to appear before others such as 8250
 # which share ttySx minor node space.  Otherwise console device
 # names change and other unplesantries.
@@ -48,6 +51,7 @@ obj-$(CONFIG_SERIAL_MPSC) += mpsc.o
 obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
 obj-$(CONFIG_ETRAX_SERIAL) += crisv10.o
 obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o
+obj-$(CONFIG_SERIAL_SC16IS7XX) += sc16is7xx.o
 obj-$(CONFIG_SERIAL_JSM) += jsm/
 obj-$(CONFIG_SERIAL_TXX9) += serial_txx9.o
 obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_siu.o
@@ -87,3 +91,7 @@ obj-$(CONFIG_SERIAL_EFM32_UART) += efm32-uart.o
 obj-$(CONFIG_SERIAL_ARC)	+= arc_uart.o
 obj-$(CONFIG_SERIAL_RP2)	+= rp2.o
 obj-$(CONFIG_SERIAL_FSL_LPUART)	+= fsl_lpuart.o
+obj-$(CONFIG_SERIAL_MEN_Z135)	+= men_z135_uart.o
+
+# GPIOLIB helpers for modem control lines
+obj-$(CONFIG_SERIAL_MCTRL_GPIO)	+= serial_mctrl_gpio.o
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index dacf0a0..908a6e3 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -303,7 +303,7 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port *
 
 	/* Optionally make use of an RX channel as well */
 	chan = dma_request_slave_channel(dev, "rx");
-	
+
 	if (!chan && plat->dma_rx_param) {
 		chan = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param);
 
@@ -2045,6 +2045,35 @@ static struct console amba_console = {
 };
 
 #define AMBA_CONSOLE	(&amba_console)
+
+static void pl011_putc(struct uart_port *port, int c)
+{
+	while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
+		;
+	writeb(c, port->membase + UART01x_DR);
+	while (readl(port->membase + UART01x_FR) & UART01x_FR_BUSY)
+		;
+}
+
+static void pl011_early_write(struct console *con, const char *s, unsigned n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, pl011_putc);
+}
+
+static int __init pl011_early_console_setup(struct earlycon_device *device,
+					    const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = pl011_early_write;
+	return 0;
+}
+EARLYCON_DECLARE(pl011, pl011_early_console_setup);
+OF_EARLYCON_DECLARE(pl011, "arm,pl011", pl011_early_console_setup);
+
 #else
 #define AMBA_CONSOLE	NULL
 #endif
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 53eeea1..3fceae0 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -43,6 +43,9 @@
 #include <linux/platform_data/atmel.h>
 #include <linux/timer.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/err.h>
+#include <linux/irq.h>
 
 #include <asm/io.h>
 #include <asm/ioctls.h>
@@ -57,6 +60,8 @@
 
 #include <linux/serial_core.h>
 
+#include "serial_mctrl_gpio.h"
+
 static void atmel_start_rx(struct uart_port *port);
 static void atmel_stop_rx(struct uart_port *port);
 
@@ -162,8 +167,10 @@ struct atmel_uart_port {
 	struct circ_buf		rx_ring;
 
 	struct serial_rs485	rs485;		/* rs485 settings */
-	int			rts_gpio;	/* optional RTS GPIO */
+	struct mctrl_gpios	*gpios;
+	int			gpio_irq[UART_GPIO_MAX];
 	unsigned int		tx_done_mask;
+	bool			ms_irq_enabled;
 	bool			is_usart;	/* usart or uart */
 	struct timer_list	uart_timer;	/* uart timer */
 	int (*prepare_rx)(struct uart_port *port);
@@ -237,6 +244,50 @@ static bool atmel_use_dma_rx(struct uart_port *port)
 	return atmel_port->use_dma_rx;
 }
 
+static unsigned int atmel_get_lines_status(struct uart_port *port)
+{
+	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+	unsigned int status, ret = 0;
+
+	status = UART_GET_CSR(port);
+
+	mctrl_gpio_get(atmel_port->gpios, &ret);
+
+	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
+						UART_GPIO_CTS))) {
+		if (ret & TIOCM_CTS)
+			status &= ~ATMEL_US_CTS;
+		else
+			status |= ATMEL_US_CTS;
+	}
+
+	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
+						UART_GPIO_DSR))) {
+		if (ret & TIOCM_DSR)
+			status &= ~ATMEL_US_DSR;
+		else
+			status |= ATMEL_US_DSR;
+	}
+
+	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
+						UART_GPIO_RI))) {
+		if (ret & TIOCM_RI)
+			status &= ~ATMEL_US_RI;
+		else
+			status |= ATMEL_US_RI;
+	}
+
+	if (!IS_ERR_OR_NULL(mctrl_gpio_to_gpiod(atmel_port->gpios,
+						UART_GPIO_DCD))) {
+		if (ret & TIOCM_CD)
+			status &= ~ATMEL_US_DCD;
+		else
+			status |= ATMEL_US_DCD;
+	}
+
+	return status;
+}
+
 /* Enable or disable the rs485 support */
 void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
 {
@@ -296,17 +347,6 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
 	unsigned int mode;
 	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
 
-	/*
-	 * AT91RM9200 Errata #39: RTS0 is not internally connected
-	 * to PA21. We need to drive the pin as a GPIO.
-	 */
-	if (gpio_is_valid(atmel_port->rts_gpio)) {
-		if (mctrl & TIOCM_RTS)
-			gpio_set_value(atmel_port->rts_gpio, 0);
-		else
-			gpio_set_value(atmel_port->rts_gpio, 1);
-	}
-
 	if (mctrl & TIOCM_RTS)
 		control |= ATMEL_US_RTSEN;
 	else
@@ -319,6 +359,8 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
 
 	UART_PUT_CR(port, control);
 
+	mctrl_gpio_set(atmel_port->gpios, mctrl);
+
 	/* Local loopback mode? */
 	mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE;
 	if (mctrl & TIOCM_LOOP)
@@ -346,7 +388,8 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
  */
 static u_int atmel_get_mctrl(struct uart_port *port)
 {
-	unsigned int status, ret = 0;
+	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+	unsigned int ret = 0, status;
 
 	status = UART_GET_CSR(port);
 
@@ -362,7 +405,7 @@ static u_int atmel_get_mctrl(struct uart_port *port)
 	if (!(status & ATMEL_US_RI))
 		ret |= TIOCM_RI;
 
-	return ret;
+	return mctrl_gpio_get(atmel_port->gpios, &ret);
 }
 
 /*
@@ -449,8 +492,38 @@ static void atmel_stop_rx(struct uart_port *port)
  */
 static void atmel_enable_ms(struct uart_port *port)
 {
-	UART_PUT_IER(port, ATMEL_US_RIIC | ATMEL_US_DSRIC
-			| ATMEL_US_DCDIC | ATMEL_US_CTSIC);
+	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+	uint32_t ier = 0;
+
+	/*
+	 * Interrupt should not be enabled twice
+	 */
+	if (atmel_port->ms_irq_enabled)
+		return;
+
+	atmel_port->ms_irq_enabled = true;
+
+	if (atmel_port->gpio_irq[UART_GPIO_CTS] >= 0)
+		enable_irq(atmel_port->gpio_irq[UART_GPIO_CTS]);
+	else
+		ier |= ATMEL_US_CTSIC;
+
+	if (atmel_port->gpio_irq[UART_GPIO_DSR] >= 0)
+		enable_irq(atmel_port->gpio_irq[UART_GPIO_DSR]);
+	else
+		ier |= ATMEL_US_DSRIC;
+
+	if (atmel_port->gpio_irq[UART_GPIO_RI] >= 0)
+		enable_irq(atmel_port->gpio_irq[UART_GPIO_RI]);
+	else
+		ier |= ATMEL_US_RIIC;
+
+	if (atmel_port->gpio_irq[UART_GPIO_DCD] >= 0)
+		enable_irq(atmel_port->gpio_irq[UART_GPIO_DCD]);
+	else
+		ier |= ATMEL_US_DCDIC;
+
+	UART_PUT_IER(port, ier);
 }
 
 /*
@@ -1039,11 +1112,31 @@ atmel_handle_status(struct uart_port *port, unsigned int pending,
 static irqreturn_t atmel_interrupt(int irq, void *dev_id)
 {
 	struct uart_port *port = dev_id;
+	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
 	unsigned int status, pending, pass_counter = 0;
+	bool gpio_handled = false;
 
 	do {
-		status = UART_GET_CSR(port);
+		status = atmel_get_lines_status(port);
 		pending = status & UART_GET_IMR(port);
+		if (!gpio_handled) {
+			/*
+			 * Dealing with GPIO interrupt
+			 */
+			if (irq == atmel_port->gpio_irq[UART_GPIO_CTS])
+				pending |= ATMEL_US_CTSIC;
+
+			if (irq == atmel_port->gpio_irq[UART_GPIO_DSR])
+				pending |= ATMEL_US_DSRIC;
+
+			if (irq == atmel_port->gpio_irq[UART_GPIO_RI])
+				pending |= ATMEL_US_RIIC;
+
+			if (irq == atmel_port->gpio_irq[UART_GPIO_DCD])
+				pending |= ATMEL_US_DCDIC;
+
+			gpio_handled = true;
+		}
 		if (!pending)
 			break;
 
@@ -1523,6 +1616,45 @@ static void atmel_get_ip_name(struct uart_port *port)
 	}
 }
 
+static void atmel_free_gpio_irq(struct uart_port *port)
+{
+	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+	enum mctrl_gpio_idx i;
+
+	for (i = 0; i < UART_GPIO_MAX; i++)
+		if (atmel_port->gpio_irq[i] >= 0)
+			free_irq(atmel_port->gpio_irq[i], port);
+}
+
+static int atmel_request_gpio_irq(struct uart_port *port)
+{
+	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+	int *irq = atmel_port->gpio_irq;
+	enum mctrl_gpio_idx i;
+	int err = 0;
+
+	for (i = 0; (i < UART_GPIO_MAX) && !err; i++) {
+		if (irq[i] < 0)
+			continue;
+
+		irq_set_status_flags(irq[i], IRQ_NOAUTOEN);
+		err = request_irq(irq[i], atmel_interrupt, IRQ_TYPE_EDGE_BOTH,
+				  "atmel_serial", port);
+		if (err)
+			dev_err(port->dev, "atmel_startup - Can't get %d irq\n",
+				irq[i]);
+	}
+
+	/*
+	 * If something went wrong, rollback.
+	 */
+	while (err && (--i >= 0))
+		if (irq[i] >= 0)
+			free_irq(irq[i], port);
+
+	return err;
+}
+
 /*
  * Perform initialization and enable port for reception
  */
@@ -1539,6 +1671,7 @@ static int atmel_startup(struct uart_port *port)
 	 * handle an unexpected interrupt
 	 */
 	UART_PUT_IDR(port, -1);
+	atmel_port->ms_irq_enabled = false;
 
 	/*
 	 * Allocate the IRQ
@@ -1551,6 +1684,13 @@ static int atmel_startup(struct uart_port *port)
 	}
 
 	/*
+	 * Get the GPIO lines IRQ
+	 */
+	retval = atmel_request_gpio_irq(port);
+	if (retval)
+		goto free_irq;
+
+	/*
 	 * Initialize DMA (if necessary)
 	 */
 	atmel_init_property(atmel_port, pdev);
@@ -1568,7 +1708,7 @@ static int atmel_startup(struct uart_port *port)
 	}
 
 	/* Save current CSR for comparison in atmel_tasklet_func() */
-	atmel_port->irq_status_prev = UART_GET_CSR(port);
+	atmel_port->irq_status_prev = atmel_get_lines_status(port);
 	atmel_port->irq_status = atmel_port->irq_status_prev;
 
 	/*
@@ -1614,6 +1754,11 @@ static int atmel_startup(struct uart_port *port)
 	}
 
 	return 0;
+
+free_irq:
+	free_irq(port->irq, port);
+
+	return retval;
 }
 
 /*
@@ -1661,9 +1806,12 @@ static void atmel_shutdown(struct uart_port *port)
 	atmel_port->rx_ring.tail = 0;
 
 	/*
-	 * Free the interrupt
+	 * Free the interrupts
 	 */
 	free_irq(port->irq, port);
+	atmel_free_gpio_irq(port);
+
+	atmel_port->ms_irq_enabled = false;
 }
 
 /*
@@ -2324,6 +2472,26 @@ static int atmel_serial_resume(struct platform_device *pdev)
 #define atmel_serial_resume NULL
 #endif
 
+static int atmel_init_gpios(struct atmel_uart_port *p, struct device *dev)
+{
+	enum mctrl_gpio_idx i;
+	struct gpio_desc *gpiod;
+
+	p->gpios = mctrl_gpio_init(dev, 0);
+	if (IS_ERR_OR_NULL(p->gpios))
+		return -1;
+
+	for (i = 0; i < UART_GPIO_MAX; i++) {
+		gpiod = mctrl_gpio_to_gpiod(p->gpios, i);
+		if (gpiod && (gpiod_get_direction(gpiod) == GPIOF_DIR_IN))
+			p->gpio_irq[i] = gpiod_to_irq(gpiod);
+		else
+			p->gpio_irq[i] = -EINVAL;
+	}
+
+	return 0;
+}
+
 static int atmel_serial_probe(struct platform_device *pdev)
 {
 	struct atmel_uart_port *port;
@@ -2359,25 +2527,11 @@ static int atmel_serial_probe(struct platform_device *pdev)
 	port = &atmel_ports[ret];
 	port->backup_imr = 0;
 	port->uart.line = ret;
-	port->rts_gpio = -EINVAL; /* Invalid, zero could be valid */
-	if (pdata)
-		port->rts_gpio = pdata->rts_gpio;
-	else if (np)
-		port->rts_gpio = of_get_named_gpio(np, "rts-gpios", 0);
-
-	if (gpio_is_valid(port->rts_gpio)) {
-		ret = devm_gpio_request(&pdev->dev, port->rts_gpio, "RTS");
-		if (ret) {
-			dev_err(&pdev->dev, "error requesting RTS GPIO\n");
-			goto err;
-		}
-		/* Default to 1 as RTS is active low */
-		ret = gpio_direction_output(port->rts_gpio, 1);
-		if (ret) {
-			dev_err(&pdev->dev, "error setting up RTS GPIO\n");
-			goto err;
-		}
-	}
+
+	ret = atmel_init_gpios(port, &pdev->dev);
+	if (ret < 0)
+		dev_err(&pdev->dev, "%s",
+			"Failed to initialize GPIOs. The serial port may not work as expected");
 
 	ret = atmel_init_port(port, pdev);
 	if (ret)
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 7d76214..aa60e6d 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -971,7 +971,7 @@ static void cpm_uart_config_port(struct uart_port *port, int flags)
  * Note that this is called with interrupts already disabled
  */
 static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
-		const char *string, u_int count)
+		const char *string, u_int count, bool handle_linefeed)
 {
 	unsigned int i;
 	cbd_t __iomem *bdp, *bdbase;
@@ -1013,7 +1013,7 @@ static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
 			bdp++;
 
 		/* if a LF, also do CR... */
-		if (*string == 10) {
+		if (handle_linefeed && *string == 10) {
 			while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
 				;
 
@@ -1111,7 +1111,7 @@ static void cpm_put_poll_char(struct uart_port *port,
 	static char ch[2];
 
 	ch[0] = (char)c;
-	cpm_uart_early_write(pinfo, ch, 1);
+	cpm_uart_early_write(pinfo, ch, 1, false);
 }
 #endif /* CONFIG_CONSOLE_POLL */
 
@@ -1275,7 +1275,7 @@ static void cpm_uart_console_write(struct console *co, const char *s,
 		spin_lock_irqsave(&pinfo->port.lock, flags);
 	}
 
-	cpm_uart_early_write(pinfo, s, count);
+	cpm_uart_early_write(pinfo, s, count, true);
 
 	if (unlikely(nolock)) {
 		local_irq_restore(flags);
diff --git a/drivers/tty/serial/earlycon-arm-semihost.c b/drivers/tty/serial/earlycon-arm-semihost.c
new file mode 100644
index 0000000..383db10
--- /dev/null
+++ b/drivers/tty/serial/earlycon-arm-semihost.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Adapted for ARM and earlycon:
+ * Copyright (C) 2014 Linaro Ltd.
+ * Author: Rob Herring <robh@kernel.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+
+#ifdef CONFIG_THUMB2_KERNEL
+#define SEMIHOST_SWI	"0xab"
+#else
+#define SEMIHOST_SWI	"0x123456"
+#endif
+
+/*
+ * Semihosting-based debug console
+ */
+static void smh_putc(struct uart_port *port, int c)
+{
+#ifdef CONFIG_ARM64
+	asm volatile("mov  x1, %0\n"
+		     "mov  x0, #3\n"
+		     "hlt  0xf000\n"
+		     : : "r" (&c) : "x0", "x1", "memory");
+#else
+	asm volatile("mov  r1, %0\n"
+		     "mov  r0, #3\n"
+		     "svc  " SEMIHOST_SWI "\n"
+		     : : "r" (&c) : "r0", "r1", "memory");
+#endif
+}
+
+static void smh_write(struct console *con, const char *s, unsigned n)
+{
+	struct earlycon_device *dev = con->data;
+	uart_console_write(&dev->port, s, n, smh_putc);
+}
+
+int __init early_smh_setup(struct earlycon_device *device, const char *opt)
+{
+	device->con->write = smh_write;
+	return 0;
+}
+EARLYCON_DECLARE(smh, early_smh_setup);
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
new file mode 100644
index 0000000..5131b5e
--- /dev/null
+++ b/drivers/tty/serial/earlycon.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2014 Linaro Ltd.
+ * Author: Rob Herring <robh@kernel.org>
+ *
+ * Based on 8250 earlycon:
+ * (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
+ *	Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/console.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/serial_core.h>
+#include <linux/sizes.h>
+#include <linux/mod_devicetable.h>
+
+#ifdef CONFIG_FIX_EARLYCON_MEM
+#include <asm/fixmap.h>
+#endif
+
+#include <asm/serial.h>
+
+static struct console early_con = {
+	.name =		"earlycon",
+	.flags =	CON_PRINTBUFFER | CON_BOOT,
+	.index =	-1,
+};
+
+static struct earlycon_device early_console_dev = {
+	.con = &early_con,
+};
+
+static const struct of_device_id __earlycon_of_table_sentinel
+	__used __section(__earlycon_of_table_end);
+
+static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
+{
+	void __iomem *base;
+#ifdef CONFIG_FIX_EARLYCON_MEM
+	set_fixmap_io(FIX_EARLYCON_MEM_BASE, paddr & PAGE_MASK);
+	base = (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
+	base += paddr & ~PAGE_MASK;
+#else
+	base = ioremap(paddr, size);
+#endif
+	if (!base)
+		pr_err("%s: Couldn't map 0x%llx\n", __func__,
+		       (unsigned long long)paddr);
+
+	return base;
+}
+
+static int __init parse_options(struct earlycon_device *device,
+				char *options)
+{
+	struct uart_port *port = &device->port;
+	int mmio, mmio32, length;
+	unsigned long addr;
+
+	if (!options)
+		return -ENODEV;
+
+	mmio = !strncmp(options, "mmio,", 5);
+	mmio32 = !strncmp(options, "mmio32,", 7);
+	if (mmio || mmio32) {
+		port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
+		options += mmio ? 5 : 7;
+		addr = simple_strtoul(options, NULL, 0);
+		port->mapbase = addr;
+		if (mmio32)
+			port->regshift = 2;
+	} else if (!strncmp(options, "io,", 3)) {
+		port->iotype = UPIO_PORT;
+		options += 3;
+		addr = simple_strtoul(options, NULL, 0);
+		port->iobase = addr;
+		mmio = 0;
+	} else if (!strncmp(options, "0x", 2)) {
+		port->iotype = UPIO_MEM;
+		addr = simple_strtoul(options, NULL, 0);
+		port->mapbase = addr;
+	} else {
+		return -EINVAL;
+	}
+
+	port->uartclk = BASE_BAUD * 16;
+
+	options = strchr(options, ',');
+	if (options) {
+		options++;
+		device->baud = simple_strtoul(options, NULL, 0);
+		length = min(strcspn(options, " ") + 1,
+			     (size_t)(sizeof(device->options)));
+		strlcpy(device->options, options, length);
+	}
+
+	if (mmio || mmio32)
+		pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n",
+			mmio32 ? "32" : "",
+			(unsigned long long)port->mapbase,
+			device->options);
+	else
+		pr_info("Early serial console at I/O port 0x%lx (options '%s')\n",
+			port->iobase,
+			device->options);
+
+	return 0;
+}
+
+int __init setup_earlycon(char *buf, const char *match,
+			  int (*setup)(struct earlycon_device *, const char *))
+{
+	int err;
+	size_t len;
+	struct uart_port *port = &early_console_dev.port;
+
+	if (!buf || !match || !setup)
+		return 0;
+
+	len = strlen(match);
+	if (strncmp(buf, match, len))
+		return 0;
+	if (buf[len] && (buf[len] != ','))
+		return 0;
+
+	buf += len + 1;
+
+	err = parse_options(&early_console_dev, buf);
+	/* On parsing error, pass the options buf to the setup function */
+	if (!err)
+		buf = NULL;
+
+	if (port->mapbase)
+		port->membase = earlycon_map(port->mapbase, 64);
+
+	early_console_dev.con->data = &early_console_dev;
+	err = setup(&early_console_dev, buf);
+	if (err < 0)
+		return err;
+	if (!early_console_dev.con->write)
+		return -ENODEV;
+
+	register_console(early_console_dev.con);
+	return 0;
+}
+
+int __init of_setup_earlycon(unsigned long addr,
+			     int (*setup)(struct earlycon_device *, const char *))
+{
+	int err;
+	struct uart_port *port = &early_console_dev.port;
+
+	port->iotype = UPIO_MEM;
+	port->mapbase = addr;
+	port->uartclk = BASE_BAUD * 16;
+	port->membase = earlycon_map(addr, SZ_4K);
+
+	early_console_dev.con->data = &early_console_dev;
+	err = setup(&early_console_dev, NULL);
+	if (err < 0)
+		return err;
+	if (!early_console_dev.con->write)
+		return -ENODEV;
+
+
+	register_console(early_console_dev.con);
+	return 0;
+}
diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c
index c167a71..b373f64 100644
--- a/drivers/tty/serial/efm32-uart.c
+++ b/drivers/tty/serial/efm32-uart.c
@@ -842,6 +842,7 @@ static void __exit efm32_uart_exit(void)
 	platform_driver_unregister(&efm32_uart_driver);
 	uart_unregister_driver(&efm32_uart_reg);
 }
+module_exit(efm32_uart_exit);
 
 MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
 MODULE_DESCRIPTION("EFM32 UART/USART driver");
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 3b6c1a2..e2f9387 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -116,7 +116,7 @@
 #define UCR3_DSR	(1<<10) /* Data set ready */
 #define UCR3_DCD	(1<<9)	/* Data carrier detect */
 #define UCR3_RI		(1<<8)	/* Ring indicator */
-#define UCR3_TIMEOUTEN	(1<<7)	/* Timeout interrupt enable */
+#define UCR3_ADNIMP	(1<<7)	/* Autobaud Detection Not Improved */
 #define UCR3_RXDSEN	(1<<6)	/* Receive status interrupt enable */
 #define UCR3_AIRINTEN	(1<<5)	/* Async IR wake interrupt enable */
 #define UCR3_AWAKEN	(1<<4)	/* Async wake interrupt enable */
@@ -444,6 +444,10 @@ static void imx_stop_rx(struct uart_port *port)
 
 	temp = readl(sport->port.membase + UCR2);
 	writel(temp & ~UCR2_RXEN, sport->port.membase + UCR2);
+
+	/* disable the `Receiver Ready Interrrupt` */
+	temp = readl(sport->port.membase + UCR1);
+	writel(temp & ~UCR1_RRDYEN, sport->port.membase + UCR1);
 }
 
 /*
@@ -1070,7 +1074,7 @@ static void imx_disable_dma(struct imx_port *sport)
 static int imx_startup(struct uart_port *port)
 {
 	struct imx_port *sport = (struct imx_port *)port;
-	int retval;
+	int retval, i;
 	unsigned long flags, temp;
 
 	retval = clk_prepare_enable(sport->clk_per);
@@ -1098,17 +1102,15 @@ static int imx_startup(struct uart_port *port)
 
 	writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
 
-	if (USE_IRDA(sport)) {
-		/* reset fifo's and state machines */
-		int i = 100;
-		temp = readl(sport->port.membase + UCR2);
-		temp &= ~UCR2_SRST;
-		writel(temp, sport->port.membase + UCR2);
-		while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) &&
-		    (--i > 0)) {
-			udelay(1);
-		}
-	}
+	/* Reset fifo's and state machines */
+	i = 100;
+
+	temp = readl(sport->port.membase + UCR2);
+	temp &= ~UCR2_SRST;
+	writel(temp, sport->port.membase + UCR2);
+
+	while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) && (--i > 0))
+		udelay(1);
 
 	/*
 	 * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
@@ -1163,18 +1165,9 @@ static int imx_startup(struct uart_port *port)
 		temp |= UCR2_IRTS;
 	writel(temp, sport->port.membase + UCR2);
 
-	if (USE_IRDA(sport)) {
-		/* clear RX-FIFO */
-		int i = 64;
-		while ((--i > 0) &&
-			(readl(sport->port.membase + URXD0) & URXD_CHARRDY)) {
-			barrier();
-		}
-	}
-
 	if (!is_imx1_uart(sport)) {
 		temp = readl(sport->port.membase + UCR3);
-		temp |= IMX21_UCR3_RXDMUXSEL;
+		temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP;
 		writel(temp, sport->port.membase + UCR3);
 	}
 
diff --git a/drivers/tty/serial/kgdb_nmi.c b/drivers/tty/serial/kgdb_nmi.c
index 5f673b7..cfadf29 100644
--- a/drivers/tty/serial/kgdb_nmi.c
+++ b/drivers/tty/serial/kgdb_nmi.c
@@ -44,13 +44,22 @@ MODULE_PARM_DESC(magic, "magic sequence to enter NMI debugger (default $3#33)");
 
 static bool kgdb_nmi_tty_enabled;
 
+static int kgdb_nmi_console_setup(struct console *co, char *options)
+{
+	/* The NMI console uses the dbg_io_ops to issue console messages. To
+	 * avoid duplicate messages during kdb sessions we must inform kdb's
+	 * I/O utilities that messages sent to the console will automatically
+	 * be displayed on the dbg_io.
+	 */
+	dbg_io_ops->is_console = true;
+
+	return 0;
+}
+
 static void kgdb_nmi_console_write(struct console *co, const char *s, uint c)
 {
 	int i;
 
-	if (!kgdb_nmi_tty_enabled || atomic_read(&kgdb_active) >= 0)
-		return;
-
 	for (i = 0; i < c; i++)
 		dbg_io_ops->write_char(s[i]);
 }
@@ -65,6 +74,7 @@ static struct tty_driver *kgdb_nmi_console_device(struct console *co, int *idx)
 
 static struct console kgdb_nmi_console = {
 	.name	= "ttyNMI",
+	.setup  = kgdb_nmi_console_setup,
 	.write	= kgdb_nmi_console_write,
 	.device	= kgdb_nmi_console_device,
 	.flags	= CON_PRINTBUFFER | CON_ANYTIME | CON_ENABLED,
@@ -80,29 +90,10 @@ static struct console kgdb_nmi_console = {
 
 struct kgdb_nmi_tty_priv {
 	struct tty_port port;
-	struct tasklet_struct tlet;
+	struct timer_list timer;
 	STRUCT_KFIFO(char, KGDB_NMI_FIFO_SIZE) fifo;
 };
 
-static struct kgdb_nmi_tty_priv *kgdb_nmi_port_to_priv(struct tty_port *port)
-{
-	return container_of(port, struct kgdb_nmi_tty_priv, port);
-}
-
-/*
- * Our debugging console is polled in a tasklet, so we'll check for input
- * every tick. In HZ-less mode, we should program the next tick.  We have
- * to use the lowlevel stuff as no locks should be grabbed.
- */
-#ifdef CONFIG_HIGH_RES_TIMERS
-static void kgdb_tty_poke(void)
-{
-	tick_program_event(ktime_get(), 0);
-}
-#else
-static inline void kgdb_tty_poke(void) {}
-#endif
-
 static struct tty_port *kgdb_nmi_port;
 
 static void kgdb_tty_recv(int ch)
@@ -113,14 +104,13 @@ static void kgdb_tty_recv(int ch)
 	if (!kgdb_nmi_port || ch < 0)
 		return;
 	/*
-	 * Can't use port->tty->driver_data as tty might be not there. Tasklet
+	 * Can't use port->tty->driver_data as tty might be not there. Timer
 	 * will check for tty and will get the ref, but here we don't have to
 	 * do that, and actually, we can't: we're in NMI context, no locks are
 	 * possible.
 	 */
-	priv = kgdb_nmi_port_to_priv(kgdb_nmi_port);
+	priv = container_of(kgdb_nmi_port, struct kgdb_nmi_tty_priv, port);
 	kfifo_in(&priv->fifo, &c, 1);
-	kgdb_tty_poke();
 }
 
 static int kgdb_nmi_poll_one_knock(void)
@@ -204,7 +194,8 @@ static void kgdb_nmi_tty_receiver(unsigned long data)
 	struct kgdb_nmi_tty_priv *priv = (void *)data;
 	char ch;
 
-	tasklet_schedule(&priv->tlet);
+	priv->timer.expires = jiffies + (HZ/100);
+	add_timer(&priv->timer);
 
 	if (likely(!kgdb_nmi_tty_enabled || !kfifo_len(&priv->fifo)))
 		return;
@@ -216,18 +207,22 @@ static void kgdb_nmi_tty_receiver(unsigned long data)
 
 static int kgdb_nmi_tty_activate(struct tty_port *port, struct tty_struct *tty)
 {
-	struct kgdb_nmi_tty_priv *priv = tty->driver_data;
+	struct kgdb_nmi_tty_priv *priv =
+	    container_of(port, struct kgdb_nmi_tty_priv, port);
 
 	kgdb_nmi_port = port;
-	tasklet_schedule(&priv->tlet);
+	priv->timer.expires = jiffies + (HZ/100);
+	add_timer(&priv->timer);
+
 	return 0;
 }
 
 static void kgdb_nmi_tty_shutdown(struct tty_port *port)
 {
-	struct kgdb_nmi_tty_priv *priv = port->tty->driver_data;
+	struct kgdb_nmi_tty_priv *priv =
+	    container_of(port, struct kgdb_nmi_tty_priv, port);
 
-	tasklet_kill(&priv->tlet);
+	del_timer(&priv->timer);
 	kgdb_nmi_port = NULL;
 }
 
@@ -246,7 +241,7 @@ static int kgdb_nmi_tty_install(struct tty_driver *drv, struct tty_struct *tty)
 		return -ENOMEM;
 
 	INIT_KFIFO(priv->fifo);
-	tasklet_init(&priv->tlet, kgdb_nmi_tty_receiver, (unsigned long)priv);
+	setup_timer(&priv->timer, kgdb_nmi_tty_receiver, (unsigned long)priv);
 	tty_port_init(&priv->port);
 	priv->port.ops = &kgdb_nmi_tty_port_ops;
 	tty->driver_data = priv;
diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
new file mode 100644
index 0000000..c9d1854
--- /dev/null
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -0,0 +1,867 @@
+/*
+ * MEN 16z135 High Speed UART
+ *
+ * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
+ * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ":" fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/serial_core.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/tty_flip.h>
+#include <linux/bitops.h>
+#include <linux/mcb.h>
+
+#define MEN_Z135_MAX_PORTS		12
+#define MEN_Z135_BASECLK		29491200
+#define MEN_Z135_FIFO_SIZE		1024
+#define MEN_Z135_NUM_MSI_VECTORS	2
+#define MEN_Z135_FIFO_WATERMARK		1020
+
+#define MEN_Z135_STAT_REG		0x0
+#define MEN_Z135_RX_RAM			0x4
+#define MEN_Z135_TX_RAM			0x400
+#define MEN_Z135_RX_CTRL		0x800
+#define MEN_Z135_TX_CTRL		0x804
+#define MEN_Z135_CONF_REG		0x808
+#define MEN_Z135_UART_FREQ		0x80c
+#define MEN_Z135_BAUD_REG		0x810
+#define MENZ135_TIMEOUT			0x814
+
+#define MEN_Z135_MEM_SIZE		0x818
+
+#define IS_IRQ(x) ((x) & 1)
+#define IRQ_ID(x) (((x) >> 1) & 7)
+
+#define MEN_Z135_IER_RXCIEN BIT(0)		/* RX Space IRQ */
+#define MEN_Z135_IER_TXCIEN BIT(1)		/* TX Space IRQ */
+#define MEN_Z135_IER_RLSIEN BIT(2)		/* Receiver Line Status IRQ */
+#define MEN_Z135_IER_MSIEN  BIT(3)		/* Modem Status IRQ */
+#define MEN_Z135_ALL_IRQS (MEN_Z135_IER_RXCIEN		\
+				| MEN_Z135_IER_RLSIEN	\
+				| MEN_Z135_IER_MSIEN	\
+				| MEN_Z135_IER_TXCIEN)
+
+#define MEN_Z135_MCR_DTR	BIT(24)
+#define MEN_Z135_MCR_RTS	BIT(25)
+#define MEN_Z135_MCR_OUT1	BIT(26)
+#define MEN_Z135_MCR_OUT2	BIT(27)
+#define MEN_Z135_MCR_LOOP	BIT(28)
+#define MEN_Z135_MCR_RCFC	BIT(29)
+
+#define MEN_Z135_MSR_DCTS	BIT(0)
+#define MEN_Z135_MSR_DDSR	BIT(1)
+#define MEN_Z135_MSR_DRI	BIT(2)
+#define MEN_Z135_MSR_DDCD	BIT(3)
+#define MEN_Z135_MSR_CTS	BIT(4)
+#define MEN_Z135_MSR_DSR	BIT(5)
+#define MEN_Z135_MSR_RI		BIT(6)
+#define MEN_Z135_MSR_DCD	BIT(7)
+
+#define MEN_Z135_LCR_SHIFT 8	/* LCR shift mask */
+
+#define MEN_Z135_WL5 0		/* CS5 */
+#define MEN_Z135_WL6 1		/* CS6 */
+#define MEN_Z135_WL7 2		/* CS7 */
+#define MEN_Z135_WL8 3		/* CS8 */
+
+#define MEN_Z135_STB_SHIFT 2	/* Stopbits */
+#define MEN_Z135_NSTB1 0
+#define MEN_Z135_NSTB2 1
+
+#define MEN_Z135_PEN_SHIFT 3	/* Parity enable */
+#define MEN_Z135_PAR_DIS 0
+#define MEN_Z135_PAR_ENA 1
+
+#define MEN_Z135_PTY_SHIFT 4	/* Parity type */
+#define MEN_Z135_PTY_ODD 0
+#define MEN_Z135_PTY_EVN 1
+
+#define MEN_Z135_LSR_DR BIT(0)
+#define MEN_Z135_LSR_OE BIT(1)
+#define MEN_Z135_LSR_PE BIT(2)
+#define MEN_Z135_LSR_FE BIT(3)
+#define MEN_Z135_LSR_BI BIT(4)
+#define MEN_Z135_LSR_THEP BIT(5)
+#define MEN_Z135_LSR_TEXP BIT(6)
+#define MEN_Z135_LSR_RXFIFOERR BIT(7)
+
+#define MEN_Z135_IRQ_ID_MST 0
+#define MEN_Z135_IRQ_ID_TSA 1
+#define MEN_Z135_IRQ_ID_RDA 2
+#define MEN_Z135_IRQ_ID_RLS 3
+#define MEN_Z135_IRQ_ID_CTI 6
+
+#define LCR(x) (((x) >> MEN_Z135_LCR_SHIFT) & 0xff)
+
+#define BYTES_TO_ALIGN(x) ((x) & 0x3)
+
+static int line;
+
+static int txlvl = 5;
+module_param(txlvl, int, S_IRUGO);
+MODULE_PARM_DESC(txlvl, "TX IRQ trigger level 0-7, default 5 (128 byte)");
+
+static int rxlvl = 6;
+module_param(rxlvl, int, S_IRUGO);
+MODULE_PARM_DESC(rxlvl, "RX IRQ trigger level 0-7, default 6 (256 byte)");
+
+static int align;
+module_param(align, int, S_IRUGO);
+MODULE_PARM_DESC(align, "Keep hardware FIFO write pointer aligned, default 0");
+
+struct men_z135_port {
+	struct uart_port port;
+	struct mcb_device *mdev;
+	unsigned char *rxbuf;
+	u32 stat_reg;
+	spinlock_t lock;
+};
+#define to_men_z135(port) container_of((port), struct men_z135_port, port)
+
+/**
+ * men_z135_reg_set() - Set value in register
+ * @uart: The UART port
+ * @addr: Register address
+ * @val: value to set
+ */
+static inline void men_z135_reg_set(struct men_z135_port *uart,
+				u32 addr, u32 val)
+{
+	struct uart_port *port = &uart->port;
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&uart->lock, flags);
+
+	reg = ioread32(port->membase + addr);
+	reg |= val;
+	iowrite32(reg, port->membase + addr);
+
+	spin_unlock_irqrestore(&uart->lock, flags);
+}
+
+/**
+ * men_z135_reg_clr() - Unset value in register
+ * @uart: The UART port
+ * @addr: Register address
+ * @val: value to clear
+ */
+static inline void men_z135_reg_clr(struct men_z135_port *uart,
+				u32 addr, u32 val)
+{
+	struct uart_port *port = &uart->port;
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&uart->lock, flags);
+
+	reg = ioread32(port->membase + addr);
+	reg &= ~val;
+	iowrite32(reg, port->membase + addr);
+
+	spin_unlock_irqrestore(&uart->lock, flags);
+}
+
+/**
+ * men_z135_handle_modem_status() - Handle change of modem status
+ * @port: The UART port
+ *
+ * Handle change of modem status register. This is done by reading the "delta"
+ * versions of DCD (Data Carrier Detect) and CTS (Clear To Send).
+ */
+static void men_z135_handle_modem_status(struct men_z135_port *uart)
+{
+	if (uart->stat_reg & MEN_Z135_MSR_DDCD)
+		uart_handle_dcd_change(&uart->port,
+				uart->stat_reg & ~MEN_Z135_MSR_DCD);
+	if (uart->stat_reg & MEN_Z135_MSR_DCTS)
+		uart_handle_cts_change(&uart->port,
+				uart->stat_reg & ~MEN_Z135_MSR_CTS);
+}
+
+static void men_z135_handle_lsr(struct men_z135_port *uart)
+{
+	struct uart_port *port = &uart->port;
+	u8 lsr;
+
+	lsr = (uart->stat_reg >> 16) & 0xff;
+
+	if (lsr & MEN_Z135_LSR_OE)
+		port->icount.overrun++;
+	if (lsr & MEN_Z135_LSR_PE)
+		port->icount.parity++;
+	if (lsr & MEN_Z135_LSR_FE)
+		port->icount.frame++;
+	if (lsr & MEN_Z135_LSR_BI) {
+		port->icount.brk++;
+		uart_handle_break(port);
+	}
+}
+
+/**
+ * get_rx_fifo_content() - Get the number of bytes in RX FIFO
+ * @uart: The UART port
+ *
+ * Read RXC register from hardware and return current FIFO fill size.
+ */
+static u16 get_rx_fifo_content(struct men_z135_port *uart)
+{
+	struct uart_port *port = &uart->port;
+	u32 stat_reg;
+	u16 rxc;
+	u8 rxc_lo;
+	u8 rxc_hi;
+
+	stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
+	rxc_lo = stat_reg >> 24;
+	rxc_hi = (stat_reg & 0xC0) >> 6;
+
+	rxc = rxc_lo | (rxc_hi << 8);
+
+	return rxc;
+}
+
+/**
+ * men_z135_handle_rx() - RX tasklet routine
+ * @arg: Pointer to struct men_z135_port
+ *
+ * Copy from RX FIFO and acknowledge number of bytes copied.
+ */
+static void men_z135_handle_rx(struct men_z135_port *uart)
+{
+	struct uart_port *port = &uart->port;
+	struct tty_port *tport = &port->state->port;
+	int copied;
+	u16 size;
+	int room;
+
+	size = get_rx_fifo_content(uart);
+
+	if (size == 0)
+		return;
+
+	/* Avoid accidently accessing TX FIFO instead of RX FIFO. Last
+	 * longword in RX FIFO cannot be read.(0x004-0x3FF)
+	 */
+	if (size > MEN_Z135_FIFO_WATERMARK)
+		size = MEN_Z135_FIFO_WATERMARK;
+
+	room = tty_buffer_request_room(tport, size);
+	if (room != size)
+		dev_warn(&uart->mdev->dev,
+			"Not enough room in flip buffer, truncating to %d\n",
+			room);
+
+	if (room == 0)
+		return;
+
+	memcpy_fromio(uart->rxbuf, port->membase + MEN_Z135_RX_RAM, room);
+	/* Be sure to first copy all data and then acknowledge it */
+	mb();
+	iowrite32(room, port->membase +  MEN_Z135_RX_CTRL);
+
+	copied = tty_insert_flip_string(tport, uart->rxbuf, room);
+	if (copied != room)
+		dev_warn(&uart->mdev->dev,
+			"Only copied %d instead of %d bytes\n",
+			copied, room);
+
+	port->icount.rx += copied;
+
+	tty_flip_buffer_push(tport);
+
+}
+
+/**
+ * men_z135_handle_tx() - TX tasklet routine
+ * @arg: Pointer to struct men_z135_port
+ *
+ */
+static void men_z135_handle_tx(struct men_z135_port *uart)
+{
+	struct uart_port *port = &uart->port;
+	struct circ_buf *xmit = &port->state->xmit;
+	u32 txc;
+	u32 wptr;
+	int qlen;
+	int n;
+	int txfree;
+	int head;
+	int tail;
+	int s;
+
+	if (uart_circ_empty(xmit))
+		goto out;
+
+	if (uart_tx_stopped(port))
+		goto out;
+
+	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)
+		goto out;
+
+	wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);
+	txc = (wptr >> 16) & 0x3ff;
+	wptr &= 0x3ff;
+
+	if (txc > MEN_Z135_FIFO_WATERMARK)
+		txc = MEN_Z135_FIFO_WATERMARK;
+
+	txfree = MEN_Z135_FIFO_WATERMARK - txc;
+	if (txfree <= 0) {
+		pr_err("Not enough room in TX FIFO have %d, need %d\n",
+			txfree, qlen);
+		goto irq_en;
+	}
+
+	/* if we're not aligned, it's better to copy only 1 or 2 bytes and
+	 * then the rest.
+	 */
+	if (align && qlen >= 3 && BYTES_TO_ALIGN(wptr))
+		n = 4 - BYTES_TO_ALIGN(wptr);
+	else if (qlen > txfree)
+		n = txfree;
+	else
+		n = qlen;
+
+	if (n <= 0)
+		goto irq_en;
+
+	head = xmit->head & (UART_XMIT_SIZE - 1);
+	tail = xmit->tail & (UART_XMIT_SIZE - 1);
+
+	s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail;
+	n = min(n, s);
+
+	memcpy_toio(port->membase + MEN_Z135_TX_RAM, &xmit->buf[xmit->tail], n);
+	xmit->tail = (xmit->tail + n) & (UART_XMIT_SIZE - 1);
+	mmiowb();
+
+	iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL);
+
+	port->icount.tx += n;
+
+irq_en:
+	if (!uart_circ_empty(xmit))
+		men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
+	else
+		men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
+
+out:
+	return;
+
+}
+
+/**
+ * men_z135_intr() - Handle legacy IRQs
+ * @irq: The IRQ number
+ * @data: Pointer to UART port
+ *
+ * Check IIR register to see which tasklet to start.
+ */
+static irqreturn_t men_z135_intr(int irq, void *data)
+{
+	struct men_z135_port *uart = (struct men_z135_port *)data;
+	struct uart_port *port = &uart->port;
+	int irq_id;
+
+	uart->stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
+	/* IRQ pending is low active */
+	if (IS_IRQ(uart->stat_reg))
+		return IRQ_NONE;
+
+	irq_id = IRQ_ID(uart->stat_reg);
+	switch (irq_id) {
+	case MEN_Z135_IRQ_ID_MST:
+		men_z135_handle_modem_status(uart);
+		break;
+	case MEN_Z135_IRQ_ID_TSA:
+		men_z135_handle_tx(uart);
+		break;
+	case MEN_Z135_IRQ_ID_CTI:
+		dev_dbg(&uart->mdev->dev, "Character Timeout Indication\n");
+		/* Fallthrough */
+	case MEN_Z135_IRQ_ID_RDA:
+		/* Reading data clears RX IRQ */
+		men_z135_handle_rx(uart);
+		break;
+	case MEN_Z135_IRQ_ID_RLS:
+		men_z135_handle_lsr(uart);
+		break;
+	default:
+		dev_warn(&uart->mdev->dev, "Unknown IRQ id %d\n", irq_id);
+		return IRQ_NONE;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * men_z135_request_irq() - Request IRQ for 16z135 core
+ * @uart: z135 private uart port structure
+ *
+ * Request an IRQ for 16z135 to use. First try using MSI, if it fails
+ * fall back to using legacy interrupts.
+ */
+static int men_z135_request_irq(struct men_z135_port *uart)
+{
+	struct device *dev = &uart->mdev->dev;
+	struct uart_port *port = &uart->port;
+	int err = 0;
+
+	err = request_irq(port->irq, men_z135_intr, IRQF_SHARED,
+			"men_z135_intr", uart);
+	if (err)
+		dev_err(dev, "Error %d getting interrupt\n", err);
+
+	return err;
+}
+
+/**
+ * men_z135_tx_empty() - Handle tx_empty call
+ * @port: The UART port
+ *
+ * This function tests whether the TX FIFO and shifter for the port
+ * described by @port is empty.
+ */
+static unsigned int men_z135_tx_empty(struct uart_port *port)
+{
+	u32 wptr;
+	u16 txc;
+
+	wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);
+	txc = (wptr >> 16) & 0x3ff;
+
+	if (txc == 0)
+		return TIOCSER_TEMT;
+	else
+		return 0;
+}
+
+/**
+ * men_z135_set_mctrl() - Set modem control lines
+ * @port: The UART port
+ * @mctrl: The modem control lines
+ *
+ * This function sets the modem control lines for a port described by @port
+ * to the state described by @mctrl
+ */
+static void men_z135_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+	u32 conf_reg = 0;
+
+	if (mctrl & TIOCM_RTS)
+		conf_reg |= MEN_Z135_MCR_RTS;
+	if (mctrl & TIOCM_DTR)
+		conf_reg |= MEN_Z135_MCR_DTR;
+	if (mctrl & TIOCM_OUT1)
+		conf_reg |= MEN_Z135_MCR_OUT1;
+	if (mctrl & TIOCM_OUT2)
+		conf_reg |= MEN_Z135_MCR_OUT2;
+	if (mctrl & TIOCM_LOOP)
+		conf_reg |= MEN_Z135_MCR_LOOP;
+
+	men_z135_reg_set(uart, MEN_Z135_CONF_REG, conf_reg);
+}
+
+/**
+ * men_z135_get_mctrl() - Get modem control lines
+ * @port: The UART port
+ *
+ * Retruns the current state of modem control inputs.
+ */
+static unsigned int men_z135_get_mctrl(struct uart_port *port)
+{
+	unsigned int mctrl = 0;
+	u32 stat_reg;
+	u8 msr;
+
+	stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
+
+	msr = ~((stat_reg >> 8) & 0xff);
+
+	if (msr & MEN_Z135_MSR_CTS)
+		mctrl |= TIOCM_CTS;
+	if (msr & MEN_Z135_MSR_DSR)
+		mctrl |= TIOCM_DSR;
+	if (msr & MEN_Z135_MSR_RI)
+		mctrl |= TIOCM_RI;
+	if (msr & MEN_Z135_MSR_DCD)
+		mctrl |= TIOCM_CAR;
+
+	return mctrl;
+}
+
+/**
+ * men_z135_stop_tx() - Stop transmitting characters
+ * @port: The UART port
+ *
+ * Stop transmitting characters. This might be due to CTS line becomming
+ * inactive or the tty layer indicating we want to stop transmission due to
+ * an XOFF character.
+ */
+static void men_z135_stop_tx(struct uart_port *port)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+
+	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
+}
+
+/**
+ * men_z135_start_tx() - Start transmitting characters
+ * @port: The UART port
+ *
+ * Start transmitting character. This actually doesn't transmit anything, but
+ * fires off the TX tasklet.
+ */
+static void men_z135_start_tx(struct uart_port *port)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+
+	men_z135_handle_tx(uart);
+}
+
+/**
+ * men_z135_stop_rx() - Stop receiving characters
+ * @port: The UART port
+ *
+ * Stop receiving characters; the port is in the process of being closed.
+ */
+static void men_z135_stop_rx(struct uart_port *port)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+
+	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_RXCIEN);
+}
+
+/**
+ * men_z135_enable_ms() - Enable Modem Status
+ * port:
+ *
+ * Enable Modem Status IRQ.
+ */
+static void men_z135_enable_ms(struct uart_port *port)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+
+	men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_MSIEN);
+}
+
+static int men_z135_startup(struct uart_port *port)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+	int err;
+	u32 conf_reg = 0;
+
+	err = men_z135_request_irq(uart);
+	if (err)
+		return -ENODEV;
+
+	conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);
+
+	/* Activate all but TX space available IRQ */
+	conf_reg |= MEN_Z135_ALL_IRQS & ~MEN_Z135_IER_TXCIEN;
+	conf_reg &= ~(0xff << 16);
+	conf_reg |= (txlvl << 16);
+	conf_reg |= (rxlvl << 20);
+
+	iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
+
+	return 0;
+}
+
+static void men_z135_shutdown(struct uart_port *port)
+{
+	struct men_z135_port *uart = to_men_z135(port);
+	u32 conf_reg = 0;
+
+	conf_reg |= MEN_Z135_ALL_IRQS;
+
+	men_z135_reg_clr(uart, MEN_Z135_CONF_REG, conf_reg);
+
+	free_irq(uart->port.irq, uart);
+}
+
+static void men_z135_set_termios(struct uart_port *port,
+				struct ktermios *termios,
+				struct ktermios *old)
+{
+	unsigned int baud;
+	u32 conf_reg;
+	u32 bd_reg;
+	u32 uart_freq;
+	u8 lcr;
+
+	conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);
+	lcr = LCR(conf_reg);
+
+	/* byte size */
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		lcr |= MEN_Z135_WL5;
+		break;
+	case CS6:
+		lcr |= MEN_Z135_WL6;
+		break;
+	case CS7:
+		lcr |= MEN_Z135_WL7;
+		break;
+	case CS8:
+		lcr |= MEN_Z135_WL8;
+		break;
+	}
+
+	/* stop bits */
+	if (termios->c_cflag & CSTOPB)
+		lcr |= MEN_Z135_NSTB2 << MEN_Z135_STB_SHIFT;
+
+	/* parity */
+	if (termios->c_cflag & PARENB) {
+		lcr |= MEN_Z135_PAR_ENA << MEN_Z135_PEN_SHIFT;
+
+		if (termios->c_cflag & PARODD)
+			lcr |= MEN_Z135_PTY_ODD << MEN_Z135_PTY_SHIFT;
+		else
+			lcr |= MEN_Z135_PTY_EVN << MEN_Z135_PTY_SHIFT;
+	} else
+		lcr |= MEN_Z135_PAR_DIS << MEN_Z135_PEN_SHIFT;
+
+	termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
+
+	conf_reg |= lcr << MEN_Z135_LCR_SHIFT;
+	iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
+
+	uart_freq = ioread32(port->membase + MEN_Z135_UART_FREQ);
+	if (uart_freq == 0)
+		uart_freq = MEN_Z135_BASECLK;
+
+	baud = uart_get_baud_rate(port, termios, old, 0, uart_freq / 16);
+
+	spin_lock(&port->lock);
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
+
+	bd_reg = uart_freq / (4 * baud);
+	iowrite32(bd_reg, port->membase + MEN_Z135_BAUD_REG);
+
+	uart_update_timeout(port, termios->c_cflag, baud);
+	spin_unlock(&port->lock);
+}
+
+static const char *men_z135_type(struct uart_port *port)
+{
+	return KBUILD_MODNAME;
+}
+
+static void men_z135_release_port(struct uart_port *port)
+{
+	iounmap(port->membase);
+	port->membase = NULL;
+
+	release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
+}
+
+static int men_z135_request_port(struct uart_port *port)
+{
+	int size = MEN_Z135_MEM_SIZE;
+
+	if (!request_mem_region(port->mapbase, size, "men_z135_port"))
+		return -EBUSY;
+
+	port->membase = ioremap(port->mapbase, MEN_Z135_MEM_SIZE);
+	if (port->membase == NULL) {
+		release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void men_z135_config_port(struct uart_port *port, int type)
+{
+	port->type = PORT_MEN_Z135;
+	men_z135_request_port(port);
+}
+
+static int men_z135_verify_port(struct uart_port *port,
+				struct serial_struct *serinfo)
+{
+	return -EINVAL;
+}
+
+static struct uart_ops men_z135_ops = {
+	.tx_empty = men_z135_tx_empty,
+	.set_mctrl = men_z135_set_mctrl,
+	.get_mctrl = men_z135_get_mctrl,
+	.stop_tx = men_z135_stop_tx,
+	.start_tx = men_z135_start_tx,
+	.stop_rx = men_z135_stop_rx,
+	.enable_ms = men_z135_enable_ms,
+	.startup = men_z135_startup,
+	.shutdown = men_z135_shutdown,
+	.set_termios = men_z135_set_termios,
+	.type = men_z135_type,
+	.release_port = men_z135_release_port,
+	.request_port = men_z135_request_port,
+	.config_port = men_z135_config_port,
+	.verify_port = men_z135_verify_port,
+};
+
+static struct uart_driver men_z135_driver = {
+	.owner = THIS_MODULE,
+	.driver_name = KBUILD_MODNAME,
+	.dev_name = "ttyHSU",
+	.major = 0,
+	.minor = 0,
+	.nr = MEN_Z135_MAX_PORTS,
+};
+
+/**
+ * men_z135_probe() - Probe a z135 instance
+ * @mdev: The MCB device
+ * @id: The MCB device ID
+ *
+ * men_z135_probe does the basic setup of hardware resources and registers the
+ * new uart port to the tty layer.
+ */
+static int men_z135_probe(struct mcb_device *mdev,
+			const struct mcb_device_id *id)
+{
+	struct men_z135_port *uart;
+	struct resource *mem;
+	struct device *dev;
+	int err;
+
+	dev = &mdev->dev;
+
+	uart = devm_kzalloc(dev, sizeof(struct men_z135_port), GFP_KERNEL);
+	if (!uart)
+		return -ENOMEM;
+
+	uart->rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
+	if (!uart->rxbuf)
+		return -ENOMEM;
+
+	mem = &mdev->mem;
+
+	mcb_set_drvdata(mdev, uart);
+
+	uart->port.uartclk = MEN_Z135_BASECLK * 16;
+	uart->port.fifosize = MEN_Z135_FIFO_SIZE;
+	uart->port.iotype = UPIO_MEM;
+	uart->port.ops = &men_z135_ops;
+	uart->port.irq = mcb_get_irq(mdev);
+	uart->port.iotype = UPIO_MEM;
+	uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+	uart->port.line = line++;
+	uart->port.dev = dev;
+	uart->port.type = PORT_MEN_Z135;
+	uart->port.mapbase = mem->start;
+	uart->port.membase = NULL;
+	uart->mdev = mdev;
+
+	spin_lock_init(&uart->port.lock);
+	spin_lock_init(&uart->lock);
+
+	err = uart_add_one_port(&men_z135_driver, &uart->port);
+	if (err)
+		goto err;
+
+	return 0;
+
+err:
+	free_page((unsigned long) uart->rxbuf);
+	dev_err(dev, "Failed to add UART: %d\n", err);
+
+	return err;
+}
+
+/**
+ * men_z135_remove() - Remove a z135 instance from the system
+ *
+ * @mdev: The MCB device
+ */
+static void men_z135_remove(struct mcb_device *mdev)
+{
+	struct men_z135_port *uart = mcb_get_drvdata(mdev);
+
+	line--;
+	uart_remove_one_port(&men_z135_driver, &uart->port);
+	free_page((unsigned long) uart->rxbuf);
+}
+
+static const struct mcb_device_id men_z135_ids[] = {
+	{ .device = 0x87 },
+};
+MODULE_DEVICE_TABLE(mcb, men_z135_ids);
+
+static struct mcb_driver mcb_driver = {
+	.driver = {
+		.name = "z135-uart",
+		.owner = THIS_MODULE,
+	},
+	.probe = men_z135_probe,
+	.remove = men_z135_remove,
+	.id_table = men_z135_ids,
+};
+
+/**
+ * men_z135_init() - Driver Registration Routine
+ *
+ * men_z135_init is the first routine called when the driver is loaded. All it
+ * does is register with the legacy MEN Chameleon subsystem.
+ */
+static int __init men_z135_init(void)
+{
+	int err;
+
+	err = uart_register_driver(&men_z135_driver);
+	if (err) {
+		pr_err("Failed to register UART: %d\n", err);
+		return err;
+	}
+
+	err = mcb_register_driver(&mcb_driver);
+	if  (err) {
+		pr_err("Failed to register MCB driver: %d\n", err);
+		uart_unregister_driver(&men_z135_driver);
+		return err;
+	}
+
+	return 0;
+}
+module_init(men_z135_init);
+
+/**
+ * men_z135_exit() - Driver Exit Routine
+ *
+ * men_z135_exit is called just before the driver is removed from memory.
+ */
+static void __exit men_z135_exit(void)
+{
+	mcb_unregister_driver(&mcb_driver);
+	uart_unregister_driver(&men_z135_driver);
+}
+module_exit(men_z135_exit);
+
+MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MEN 16z135 High Speed UART");
+MODULE_ALIAS("mcb:16z135");
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 053b98e..778e376 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -52,7 +52,6 @@ struct msm_port {
 	struct clk		*clk;
 	struct clk		*pclk;
 	unsigned int		imr;
-	void __iomem		*gsbi_base;
 	int			is_uartdm;
 	unsigned int		old_snap_state;
 };
@@ -599,9 +598,7 @@ static const char *msm_type(struct uart_port *port)
 static void msm_release_port(struct uart_port *port)
 {
 	struct platform_device *pdev = to_platform_device(port->dev);
-	struct msm_port *msm_port = UART_TO_MSM(port);
 	struct resource *uart_resource;
-	struct resource *gsbi_resource;
 	resource_size_t size;
 
 	uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -612,28 +609,12 @@ static void msm_release_port(struct uart_port *port)
 	release_mem_region(port->mapbase, size);
 	iounmap(port->membase);
 	port->membase = NULL;
-
-	if (msm_port->gsbi_base) {
-		writel_relaxed(GSBI_PROTOCOL_IDLE,
-				msm_port->gsbi_base + GSBI_CONTROL);
-
-		gsbi_resource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-		if (unlikely(!gsbi_resource))
-			return;
-
-		size = resource_size(gsbi_resource);
-		release_mem_region(gsbi_resource->start, size);
-		iounmap(msm_port->gsbi_base);
-		msm_port->gsbi_base = NULL;
-	}
 }
 
 static int msm_request_port(struct uart_port *port)
 {
-	struct msm_port *msm_port = UART_TO_MSM(port);
 	struct platform_device *pdev = to_platform_device(port->dev);
 	struct resource *uart_resource;
-	struct resource *gsbi_resource;
 	resource_size_t size;
 	int ret;
 
@@ -652,30 +633,8 @@ static int msm_request_port(struct uart_port *port)
 		goto fail_release_port;
 	}
 
-	gsbi_resource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	/* Is this a GSBI-based port? */
-	if (gsbi_resource) {
-		size = resource_size(gsbi_resource);
-
-		if (!request_mem_region(gsbi_resource->start, size,
-						 "msm_serial")) {
-			ret = -EBUSY;
-			goto fail_release_port_membase;
-		}
-
-		msm_port->gsbi_base = ioremap(gsbi_resource->start, size);
-		if (!msm_port->gsbi_base) {
-			ret = -EBUSY;
-			goto fail_release_gsbi;
-		}
-	}
-
 	return 0;
 
-fail_release_gsbi:
-	release_mem_region(gsbi_resource->start, size);
-fail_release_port_membase:
-	iounmap(port->membase);
 fail_release_port:
 	release_mem_region(port->mapbase, size);
 	return ret;
@@ -683,7 +642,6 @@ fail_release_port:
 
 static void msm_config_port(struct uart_port *port, int flags)
 {
-	struct msm_port *msm_port = UART_TO_MSM(port);
 	int ret;
 	if (flags & UART_CONFIG_TYPE) {
 		port->type = PORT_MSM;
@@ -691,9 +649,6 @@ static void msm_config_port(struct uart_port *port, int flags)
 		if (ret)
 			return;
 	}
-	if (msm_port->gsbi_base)
-		writel_relaxed(GSBI_PROTOCOL_UART,
-				msm_port->gsbi_base + GSBI_CONTROL);
 }
 
 static int msm_verify_port(struct uart_port *port, struct serial_struct *ser)
@@ -1110,6 +1065,7 @@ static struct of_device_id msm_match_table[] = {
 
 static struct platform_driver msm_platform_driver = {
 	.remove = msm_serial_remove,
+	.probe = msm_serial_probe,
 	.driver = {
 		.name = "msm_serial",
 		.owner = THIS_MODULE,
@@ -1125,7 +1081,7 @@ static int __init msm_serial_init(void)
 	if (unlikely(ret))
 		return ret;
 
-	ret = platform_driver_probe(&msm_platform_driver, msm_serial_probe);
+	ret = platform_driver_register(&msm_platform_driver);
 	if (unlikely(ret))
 		uart_unregister_driver(&msm_uart_driver);
 
diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h
index 1e9b68b..d98d45e 100644
--- a/drivers/tty/serial/msm_serial.h
+++ b/drivers/tty/serial/msm_serial.h
@@ -109,11 +109,6 @@
 #define UART_ISR		0x0014
 #define UART_ISR_TX_READY	(1 << 7)
 
-#define GSBI_CONTROL		0x0
-#define GSBI_PROTOCOL_CODE	0x30
-#define GSBI_PROTOCOL_UART	0x40
-#define GSBI_PROTOCOL_IDLE	0x0
-
 #define UARTDM_RXFS		0x50
 #define UARTDM_RXFS_BUF_SHIFT	0x7
 #define UARTDM_RXFS_BUF_MASK	0x7
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 7fd6aaa..be127d0 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -29,7 +29,7 @@
 #include <asm/irq.h>
 #include <asm/parisc-device.h>
 
-#ifdef CONFIG_MAGIC_SYSRQ
+#if defined(CONFIG_SERIAL_MUX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
 #include <linux/sysrq.h>
 #define SUPPORT_SYSRQ
 #endif
@@ -613,7 +613,7 @@ static void __exit mux_exit(void)
 {
 	/* Delete the Mux timer. */
 	if(port_cnt > 0) {
-		del_timer(&mux_timer);
+		del_timer_sync(&mux_timer);
 #ifdef CONFIG_SERIAL_MUX_CONSOLE
 		unregister_console(&mux_console);
 #endif
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index aa97fd8..4b5b3c2 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -200,7 +200,7 @@ static void dma_tx_callback(void *param)
 
 	/* clear the bit used to serialize the DMA tx. */
 	clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags);
-	smp_mb__after_clear_bit();
+	smp_mb__after_atomic();
 
 	/* wake up the possible processes. */
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -275,7 +275,7 @@ static void mxs_auart_tx_chars(struct mxs_auart_port *s)
 			mxs_auart_dma_tx(s, i);
 		} else {
 			clear_bit(MXS_AUART_DMA_TX_SYNC, &s->flags);
-			smp_mb__after_clear_bit();
+			smp_mb__after_atomic();
 		}
 		return;
 	}
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 9924660..68d4455 100644
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -173,6 +173,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 	{
 		struct uart_8250_port port8250;
 		memset(&port8250, 0, sizeof(port8250));
+		port.type = port_type;
 		port8250.port = port;
 
 		if (port.fifosize)
@@ -182,6 +183,10 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 					  "auto-flow-control"))
 			port8250.capabilities |= UART_CAP_AFE;
 
+		if (of_property_read_bool(ofdev->dev.of_node,
+					  "has-hw-flow-control"))
+			port8250.port.flags |= UPF_HARD_FLOW;
+
 		ret = serial8250_register_8250_port(&port8250);
 		break;
 	}
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 08b6b94..d017cec 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -163,10 +163,6 @@ struct uart_omap_port {
 	u8			wakeups_enabled;
 	u32			features;
 
-	int			DTR_gpio;
-	int			DTR_inverted;
-	int			DTR_active;
-
 	struct serial_rs485	rs485;
 	int			rts_gpio;
 
@@ -184,8 +180,6 @@ static struct uart_omap_port *ui[OMAP_MAX_HSUART_PORTS];
 /* Forward declaration of functions */
 static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
 
-static struct workqueue_struct *serial_omap_uart_wq;
-
 static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
 {
 	offset <<= up->port.regshift;
@@ -398,11 +392,8 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
 			break;
 	} while (--count > 0);
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
-		spin_unlock(&up->port.lock);
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(&up->port);
-		spin_lock(&up->port.lock);
-	}
 
 	if (uart_circ_empty(xmit))
 		serial_omap_stop_tx(&up->port);
@@ -697,16 +688,6 @@ static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	serial_out(up, UART_MCR, up->mcr);
 	pm_runtime_mark_last_busy(up->dev);
 	pm_runtime_put_autosuspend(up->dev);
-
-	if (gpio_is_valid(up->DTR_gpio) &&
-	    !!(mctrl & TIOCM_DTR) != up->DTR_active) {
-		up->DTR_active = !up->DTR_active;
-		if (gpio_cansleep(up->DTR_gpio))
-			schedule_work(&up->qos_work);
-		else
-			gpio_set_value(up->DTR_gpio,
-				       up->DTR_active != up->DTR_inverted);
-	}
 }
 
 static void serial_omap_break_ctl(struct uart_port *port, int break_state)
@@ -850,9 +831,6 @@ static void serial_omap_uart_qos_work(struct work_struct *work)
 						qos_work);
 
 	pm_qos_update_request(&up->pm_qos_request, up->latency);
-	if (gpio_is_valid(up->DTR_gpio))
-		gpio_set_value_cansleep(up->DTR_gpio,
-					up->DTR_active != up->DTR_inverted);
 }
 
 static void
@@ -1420,7 +1398,7 @@ serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
 
 	switch (cmd) {
 	case TIOCSRS485:
-		if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
+		if (copy_from_user(&rs485conf, (void __user *) arg,
 					sizeof(rs485conf)))
 			return -EFAULT;
 
@@ -1428,7 +1406,7 @@ serial_omap_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
 		break;
 
 	case TIOCGRS485:
-		if (copy_to_user((struct serial_rs485 *) arg,
+		if (copy_to_user((void __user *) arg,
 					&(to_uart_omap_port(port)->rs485),
 					sizeof(rs485conf)))
 			return -EFAULT;
@@ -1614,7 +1592,7 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up,
 	/* check for tx enable gpio */
 	up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
 	if (gpio_is_valid(up->rts_gpio)) {
-		ret = gpio_request(up->rts_gpio, "omap-serial");
+		ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
 		if (ret < 0)
 			return ret;
 		ret = gpio_direction_output(up->rts_gpio,
@@ -1644,10 +1622,13 @@ static int serial_omap_probe_rs485(struct uart_omap_port *up,
 
 static int serial_omap_probe(struct platform_device *pdev)
 {
-	struct uart_omap_port	*up;
-	struct resource		*mem, *irq;
 	struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
-	int ret, uartirq = 0, wakeirq = 0;
+	struct uart_omap_port *up;
+	struct resource *mem;
+	void __iomem *base;
+	int uartirq = 0;
+	int wakeirq = 0;
+	int ret;
 
 	/* The optional wakeirq may be specified in the board dts file */
 	if (pdev->dev.of_node) {
@@ -1658,48 +1639,19 @@ static int serial_omap_probe(struct platform_device *pdev)
 		omap_up_info = of_get_uart_port_info(&pdev->dev);
 		pdev->dev.platform_data = omap_up_info;
 	} else {
-		irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-		if (!irq) {
-			dev_err(&pdev->dev, "no irq resource?\n");
-			return -ENODEV;
-		}
-		uartirq = irq->start;
-	}
-
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem) {
-		dev_err(&pdev->dev, "no mem resource?\n");
-		return -ENODEV;
-	}
-
-	if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
-				pdev->dev.driver->name)) {
-		dev_err(&pdev->dev, "memory region already claimed\n");
-		return -EBUSY;
-	}
-
-	if (gpio_is_valid(omap_up_info->DTR_gpio) &&
-	    omap_up_info->DTR_present) {
-		ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
-		if (ret < 0)
-			return ret;
-		ret = gpio_direction_output(omap_up_info->DTR_gpio,
-					    omap_up_info->DTR_inverted);
-		if (ret < 0)
-			return ret;
+		uartirq = platform_get_irq(pdev, 0);
+		if (uartirq < 0)
+			return -EPROBE_DEFER;
 	}
 
 	up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
 	if (!up)
 		return -ENOMEM;
 
-	if (gpio_is_valid(omap_up_info->DTR_gpio) &&
-	    omap_up_info->DTR_present) {
-		up->DTR_gpio = omap_up_info->DTR_gpio;
-		up->DTR_inverted = omap_up_info->DTR_inverted;
-	} else
-		up->DTR_gpio = -EINVAL;
-	up->DTR_active = 0;
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, mem);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	up->dev = &pdev->dev;
 	up->port.dev = &pdev->dev;
@@ -1733,14 +1685,7 @@ static int serial_omap_probe(struct platform_device *pdev)
 
 	sprintf(up->name, "OMAP UART%d", up->port.line);
 	up->port.mapbase = mem->start;
-	up->port.membase = devm_ioremap(&pdev->dev, mem->start,
-						resource_size(mem));
-	if (!up->port.membase) {
-		dev_err(&pdev->dev, "can't ioremap UART\n");
-		ret = -ENOMEM;
-		goto err_ioremap;
-	}
-
+	up->port.membase = base;
 	up->port.flags = omap_up_info->flags;
 	up->port.uartclk = omap_up_info->uartclk;
 	if (!up->port.uartclk) {
@@ -1754,12 +1699,12 @@ static int serial_omap_probe(struct platform_device *pdev)
 	up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
 	pm_qos_add_request(&up->pm_qos_request,
 		PM_QOS_CPU_DMA_LATENCY, up->latency);
-	serial_omap_uart_wq = create_singlethread_workqueue(up->name);
 	INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
 
 	platform_set_drvdata(pdev, up);
 	if (omap_up_info->autosuspend_timeout == 0)
 		omap_up_info->autosuspend_timeout = -1;
+
 	device_init_wakeup(up->dev, true);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_autosuspend_delay(&pdev->dev,
@@ -1786,7 +1731,6 @@ static int serial_omap_probe(struct platform_device *pdev)
 err_add_port:
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-err_ioremap:
 err_rs485:
 err_port_line:
 	dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 0931b3f..0cb6a8e 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -257,6 +257,8 @@ struct eg20t_port {
 	dma_addr_t			rx_buf_dma;
 
 	struct dentry	*debugfs;
+#define IRQ_NAME_SIZE 17
+	char				irq_name[IRQ_NAME_SIZE];
 
 	/* protect the eg20t_port private structure and io access to membase */
 	spinlock_t lock;
@@ -1343,7 +1345,7 @@ static int pch_uart_startup(struct uart_port *port)
 		return ret;
 
 	ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
-			KBUILD_MODNAME, priv);
+			priv->irq_name, priv);
 	if (ret < 0)
 		return ret;
 
@@ -1588,13 +1590,8 @@ static void pch_uart_put_poll_char(struct uart_port *port,
 	wait_for_xmitr(priv, UART_LSR_THRE);
 	/*
 	 * Send the character out.
-	 * If a LF, also do CR...
 	 */
 	iowrite8(c, priv->membase + PCH_UART_THR);
-	if (c == 10) {
-		wait_for_xmitr(priv, UART_LSR_THRE);
-		iowrite8(13, priv->membase + PCH_UART_THR);
-	}
 
 	/*
 	 * Finally, wait for transmitter to become empty
@@ -1818,6 +1815,10 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 	priv->port.line = board->line_no;
 	priv->trigger = PCH_UART_HAL_TRIGGER_M;
 
+	snprintf(priv->irq_name, IRQ_NAME_SIZE,
+		 KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
+		 priv->port.line);
+
 	spin_lock_init(&priv->port.lock);
 
 	pci_set_drvdata(pdev, priv);
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index f9f20f3..9e7ee39 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -711,13 +711,8 @@ static void serial_pxa_put_poll_char(struct uart_port *port,
 	wait_for_xmitr(up);
 	/*
 	 *	Send the character out.
-	 *	If a LF, also do CR...
 	 */
 	serial_out(up, UART_TX, c);
-	if (c == 10) {
-		wait_for_xmitr(up);
-		serial_out(up, UART_TX, 13);
-	}
 
 	/*
 	 *	Finally, wait for transmitter to become empty
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 1f5505e..3293377 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -53,6 +53,29 @@
 
 #include "samsung.h"
 
+#if	defined(CONFIG_SERIAL_SAMSUNG_DEBUG) &&	\
+	defined(CONFIG_DEBUG_LL) &&		\
+	!defined(MODULE)
+
+extern void printascii(const char *);
+
+__printf(1, 2)
+static void dbg(const char *fmt, ...)
+{
+	va_list va;
+	char buff[256];
+
+	va_start(va, fmt);
+	vscnprintf(buff, sizeof(buf), fmt, va);
+	va_end(va);
+
+	printascii(buff);
+}
+
+#else
+#define dbg(fmt, ...) do { if (0) no_printk(fmt, ##__VA_ARGS__); } while (0)
+#endif
+
 /* UART name and device definitions */
 
 #define S3C24XX_SERIAL_NAME	"ttySAC"
@@ -468,8 +491,8 @@ static int s3c24xx_serial_startup(struct uart_port *port)
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 	int ret;
 
-	dbg("s3c24xx_serial_startup: port=%p (%08lx,%p)\n",
-	    port->mapbase, port->membase);
+	dbg("s3c24xx_serial_startup: port=%p (%08llx,%p)\n",
+	    port, (unsigned long long)port->mapbase, port->membase);
 
 	rx_enabled(port) = 1;
 
@@ -514,8 +537,8 @@ static int s3c64xx_serial_startup(struct uart_port *port)
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 	int ret;
 
-	dbg("s3c64xx_serial_startup: port=%p (%08lx,%p)\n",
-	    port->mapbase, port->membase);
+	dbg("s3c64xx_serial_startup: port=%p (%08llx,%p)\n",
+	    port, (unsigned long long)port->mapbase, port->membase);
 
 	wr_regl(port, S3C64XX_UINTM, 0xf);
 
@@ -1160,7 +1183,7 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 		return -EINVAL;
 	}
 
-	dbg("resource %p (%lx..%lx)\n", res, res->start, res->end);
+	dbg("resource %pR)\n", res);
 
 	port->membase = devm_ioremap(port->dev, res->start, resource_size(res));
 	if (!port->membase) {
@@ -1203,7 +1226,7 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 		wr_regl(port, S3C64XX_UINTSP, 0xf);
 	}
 
-	dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
+	dbg("port: map=%08x, mem=%p, irq=%d (%d,%d), clock=%u\n",
 	    port->mapbase, port->membase, port->irq,
 	    ourport->rx_irq, ourport->tx_irq, port->uartclk);
 
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index 8827e54..eb071dd 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -1,3 +1,6 @@
+#ifndef __SAMSUNG_H
+#define __SAMSUNG_H
+
 /*
  * Driver for Samsung SoC onboard UARTs.
  *
@@ -77,24 +80,4 @@ struct s3c24xx_uart_port {
 #define wr_regb(port, reg, val) __raw_writeb(val, portaddr(port, reg))
 #define wr_regl(port, reg, val) __raw_writel(val, portaddr(port, reg))
 
-#if defined(CONFIG_SERIAL_SAMSUNG_DEBUG) && \
-    defined(CONFIG_DEBUG_LL) && \
-    !defined(MODULE)
-
-extern void printascii(const char *);
-
-static void dbg(const char *fmt, ...)
-{
-	va_list va;
-	char buff[256];
-
-	va_start(va, fmt);
-	vsprintf(buff, fmt, va);
-	va_end(va);
-
-	printascii(buff);
-}
-
-#else
-#define dbg(x...) do { } while (0)
 #endif
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
new file mode 100644
index 0000000..1b6a77c
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -0,0 +1,1277 @@
+/*
+ * SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint
+ * Author: Jon Ringle <jringle@gridpoint.com>
+ *
+ *  Based on max310x.c, by Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/uaccess.h>
+
+#define SC16IS7XX_NAME			"sc16is7xx"
+
+/* SC16IS7XX register definitions */
+#define SC16IS7XX_RHR_REG		(0x00) /* RX FIFO */
+#define SC16IS7XX_THR_REG		(0x00) /* TX FIFO */
+#define SC16IS7XX_IER_REG		(0x01) /* Interrupt enable */
+#define SC16IS7XX_IIR_REG		(0x02) /* Interrupt Identification */
+#define SC16IS7XX_FCR_REG		(0x02) /* FIFO control */
+#define SC16IS7XX_LCR_REG		(0x03) /* Line Control */
+#define SC16IS7XX_MCR_REG		(0x04) /* Modem Control */
+#define SC16IS7XX_LSR_REG		(0x05) /* Line Status */
+#define SC16IS7XX_MSR_REG		(0x06) /* Modem Status */
+#define SC16IS7XX_SPR_REG		(0x07) /* Scratch Pad */
+#define SC16IS7XX_TXLVL_REG		(0x08) /* TX FIFO level */
+#define SC16IS7XX_RXLVL_REG		(0x09) /* RX FIFO level */
+#define SC16IS7XX_IODIR_REG		(0x0a) /* I/O Direction
+						* - only on 75x/76x
+						*/
+#define SC16IS7XX_IOSTATE_REG		(0x0b) /* I/O State
+						* - only on 75x/76x
+						*/
+#define SC16IS7XX_IOINTENA_REG		(0x0c) /* I/O Interrupt Enable
+						* - only on 75x/76x
+						*/
+#define SC16IS7XX_IOCONTROL_REG		(0x0e) /* I/O Control
+						* - only on 75x/76x
+						*/
+#define SC16IS7XX_EFCR_REG		(0x0f) /* Extra Features Control */
+
+/* TCR/TLR Register set: Only if ((MCR[2] == 1) && (EFR[4] == 1)) */
+#define SC16IS7XX_TCR_REG		(0x06) /* Transmit control */
+#define SC16IS7XX_TLR_REG		(0x07) /* Trigger level */
+
+/* Special Register set: Only if ((LCR[7] == 1) && (LCR != 0xBF)) */
+#define SC16IS7XX_DLL_REG		(0x00) /* Divisor Latch Low */
+#define SC16IS7XX_DLH_REG		(0x01) /* Divisor Latch High */
+
+/* Enhanced Register set: Only if (LCR == 0xBF) */
+#define SC16IS7XX_EFR_REG		(0x02) /* Enhanced Features */
+#define SC16IS7XX_XON1_REG		(0x04) /* Xon1 word */
+#define SC16IS7XX_XON2_REG		(0x05) /* Xon2 word */
+#define SC16IS7XX_XOFF1_REG		(0x06) /* Xoff1 word */
+#define SC16IS7XX_XOFF2_REG		(0x07) /* Xoff2 word */
+
+/* IER register bits */
+#define SC16IS7XX_IER_RDI_BIT		(1 << 0) /* Enable RX data interrupt */
+#define SC16IS7XX_IER_THRI_BIT		(1 << 1) /* Enable TX holding register
+						  * interrupt */
+#define SC16IS7XX_IER_RLSI_BIT		(1 << 2) /* Enable RX line status
+						  * interrupt */
+#define SC16IS7XX_IER_MSI_BIT		(1 << 3) /* Enable Modem status
+						  * interrupt */
+
+/* IER register bits - write only if (EFR[4] == 1) */
+#define SC16IS7XX_IER_SLEEP_BIT		(1 << 4) /* Enable Sleep mode */
+#define SC16IS7XX_IER_XOFFI_BIT		(1 << 5) /* Enable Xoff interrupt */
+#define SC16IS7XX_IER_RTSI_BIT		(1 << 6) /* Enable nRTS interrupt */
+#define SC16IS7XX_IER_CTSI_BIT		(1 << 7) /* Enable nCTS interrupt */
+
+/* FCR register bits */
+#define SC16IS7XX_FCR_FIFO_BIT		(1 << 0) /* Enable FIFO */
+#define SC16IS7XX_FCR_RXRESET_BIT	(1 << 1) /* Reset RX FIFO */
+#define SC16IS7XX_FCR_TXRESET_BIT	(1 << 2) /* Reset TX FIFO */
+#define SC16IS7XX_FCR_RXLVLL_BIT	(1 << 6) /* RX Trigger level LSB */
+#define SC16IS7XX_FCR_RXLVLH_BIT	(1 << 7) /* RX Trigger level MSB */
+
+/* FCR register bits - write only if (EFR[4] == 1) */
+#define SC16IS7XX_FCR_TXLVLL_BIT	(1 << 4) /* TX Trigger level LSB */
+#define SC16IS7XX_FCR_TXLVLH_BIT	(1 << 5) /* TX Trigger level MSB */
+
+/* IIR register bits */
+#define SC16IS7XX_IIR_NO_INT_BIT	(1 << 0) /* No interrupts pending */
+#define SC16IS7XX_IIR_ID_MASK		0x3e     /* Mask for the interrupt ID */
+#define SC16IS7XX_IIR_THRI_SRC		0x02     /* TX holding register empty */
+#define SC16IS7XX_IIR_RDI_SRC		0x04     /* RX data interrupt */
+#define SC16IS7XX_IIR_RLSE_SRC		0x06     /* RX line status error */
+#define SC16IS7XX_IIR_RTOI_SRC		0x0c     /* RX time-out interrupt */
+#define SC16IS7XX_IIR_MSI_SRC		0x00     /* Modem status interrupt
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_IIR_INPIN_SRC		0x30     /* Input pin change of state
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_IIR_XOFFI_SRC		0x10     /* Received Xoff */
+#define SC16IS7XX_IIR_CTSRTS_SRC	0x20     /* nCTS,nRTS change of state
+						  * from active (LOW)
+						  * to inactive (HIGH)
+						  */
+/* LCR register bits */
+#define SC16IS7XX_LCR_LENGTH0_BIT	(1 << 0) /* Word length bit 0 */
+#define SC16IS7XX_LCR_LENGTH1_BIT	(1 << 1) /* Word length bit 1
+						  *
+						  * Word length bits table:
+						  * 00 -> 5 bit words
+						  * 01 -> 6 bit words
+						  * 10 -> 7 bit words
+						  * 11 -> 8 bit words
+						  */
+#define SC16IS7XX_LCR_STOPLEN_BIT	(1 << 2) /* STOP length bit
+						  *
+						  * STOP length bit table:
+						  * 0 -> 1 stop bit
+						  * 1 -> 1-1.5 stop bits if
+						  *      word length is 5,
+						  *      2 stop bits otherwise
+						  */
+#define SC16IS7XX_LCR_PARITY_BIT	(1 << 3) /* Parity bit enable */
+#define SC16IS7XX_LCR_EVENPARITY_BIT	(1 << 4) /* Even parity bit enable */
+#define SC16IS7XX_LCR_FORCEPARITY_BIT	(1 << 5) /* 9-bit multidrop parity */
+#define SC16IS7XX_LCR_TXBREAK_BIT	(1 << 6) /* TX break enable */
+#define SC16IS7XX_LCR_DLAB_BIT		(1 << 7) /* Divisor Latch enable */
+#define SC16IS7XX_LCR_WORD_LEN_5	(0x00)
+#define SC16IS7XX_LCR_WORD_LEN_6	(0x01)
+#define SC16IS7XX_LCR_WORD_LEN_7	(0x02)
+#define SC16IS7XX_LCR_WORD_LEN_8	(0x03)
+#define SC16IS7XX_LCR_CONF_MODE_A	SC16IS7XX_LCR_DLAB_BIT /* Special
+								* reg set */
+#define SC16IS7XX_LCR_CONF_MODE_B	0xBF                   /* Enhanced
+								* reg set */
+
+/* MCR register bits */
+#define SC16IS7XX_MCR_DTR_BIT		(1 << 0) /* DTR complement
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_MCR_RTS_BIT		(1 << 1) /* RTS complement */
+#define SC16IS7XX_MCR_TCRTLR_BIT	(1 << 2) /* TCR/TLR register enable */
+#define SC16IS7XX_MCR_LOOP_BIT		(1 << 4) /* Enable loopback test mode */
+#define SC16IS7XX_MCR_XONANY_BIT	(1 << 5) /* Enable Xon Any
+						  * - write enabled
+						  * if (EFR[4] == 1)
+						  */
+#define SC16IS7XX_MCR_IRDA_BIT		(1 << 6) /* Enable IrDA mode
+						  * - write enabled
+						  * if (EFR[4] == 1)
+						  */
+#define SC16IS7XX_MCR_CLKSEL_BIT	(1 << 7) /* Divide clock by 4
+						  * - write enabled
+						  * if (EFR[4] == 1)
+						  */
+
+/* LSR register bits */
+#define SC16IS7XX_LSR_DR_BIT		(1 << 0) /* Receiver data ready */
+#define SC16IS7XX_LSR_OE_BIT		(1 << 1) /* Overrun Error */
+#define SC16IS7XX_LSR_PE_BIT		(1 << 2) /* Parity Error */
+#define SC16IS7XX_LSR_FE_BIT		(1 << 3) /* Frame Error */
+#define SC16IS7XX_LSR_BI_BIT		(1 << 4) /* Break Interrupt */
+#define SC16IS7XX_LSR_BRK_ERROR_MASK	0x1E     /* BI, FE, PE, OE bits */
+#define SC16IS7XX_LSR_THRE_BIT		(1 << 5) /* TX holding register empty */
+#define SC16IS7XX_LSR_TEMT_BIT		(1 << 6) /* Transmitter empty */
+#define SC16IS7XX_LSR_FIFOE_BIT		(1 << 7) /* Fifo Error */
+
+/* MSR register bits */
+#define SC16IS7XX_MSR_DCTS_BIT		(1 << 0) /* Delta CTS Clear To Send */
+#define SC16IS7XX_MSR_DDSR_BIT		(1 << 1) /* Delta DSR Data Set Ready
+						  * or (IO4)
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_MSR_DRI_BIT		(1 << 2) /* Delta RI Ring Indicator
+						  * or (IO7)
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_MSR_DCD_BIT		(1 << 3) /* Delta CD Carrier Detect
+						  * or (IO6)
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_MSR_CTS_BIT		(1 << 0) /* CTS */
+#define SC16IS7XX_MSR_DSR_BIT		(1 << 1) /* DSR (IO4)
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_MSR_RI_BIT		(1 << 2) /* RI (IO7)
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_MSR_CD_BIT		(1 << 3) /* CD (IO6)
+						  * - only on 75x/76x
+						  */
+#define SC16IS7XX_MSR_DELTA_MASK	0x0F     /* Any of the delta bits! */
+
+/*
+ * TCR register bits
+ * TCR trigger levels are available from 0 to 60 characters with a granularity
+ * of four.
+ * The programmer must program the TCR such that TCR[3:0] > TCR[7:4]. There is
+ * no built-in hardware check to make sure this condition is met. Also, the TCR
+ * must be programmed with this condition before auto RTS or software flow
+ * control is enabled to avoid spurious operation of the device.
+ */
+#define SC16IS7XX_TCR_RX_HALT(words)	((((words) / 4) & 0x0f) << 0)
+#define SC16IS7XX_TCR_RX_RESUME(words)	((((words) / 4) & 0x0f) << 4)
+
+/*
+ * TLR register bits
+ * If TLR[3:0] or TLR[7:4] are logical 0, the selectable trigger levels via the
+ * FIFO Control Register (FCR) are used for the transmit and receive FIFO
+ * trigger levels. Trigger levels from 4 characters to 60 characters are
+ * available with a granularity of four.
+ *
+ * When the trigger level setting in TLR is zero, the SC16IS740/750/760 uses the
+ * trigger level setting defined in FCR. If TLR has non-zero trigger level value
+ * the trigger level defined in FCR is discarded. This applies to both transmit
+ * FIFO and receive FIFO trigger level setting.
+ *
+ * When TLR is used for RX trigger level control, FCR[7:6] should be left at the
+ * default state, that is, '00'.
+ */
+#define SC16IS7XX_TLR_TX_TRIGGER(words)	((((words) / 4) & 0x0f) << 0)
+#define SC16IS7XX_TLR_RX_TRIGGER(words)	((((words) / 4) & 0x0f) << 4)
+
+/* IOControl register bits (Only 750/760) */
+#define SC16IS7XX_IOCONTROL_LATCH_BIT	(1 << 0) /* Enable input latching */
+#define SC16IS7XX_IOCONTROL_GPIO_BIT	(1 << 1) /* Enable GPIO[7:4] */
+#define SC16IS7XX_IOCONTROL_SRESET_BIT	(1 << 3) /* Software Reset */
+
+/* EFCR register bits */
+#define SC16IS7XX_EFCR_9BIT_MODE_BIT	(1 << 0) /* Enable 9-bit or Multidrop
+						  * mode (RS485) */
+#define SC16IS7XX_EFCR_RXDISABLE_BIT	(1 << 1) /* Disable receiver */
+#define SC16IS7XX_EFCR_TXDISABLE_BIT	(1 << 2) /* Disable transmitter */
+#define SC16IS7XX_EFCR_AUTO_RS485_BIT	(1 << 4) /* Auto RS485 RTS direction */
+#define SC16IS7XX_EFCR_RTS_INVERT_BIT	(1 << 5) /* RTS output inversion */
+#define SC16IS7XX_EFCR_IRDA_MODE_BIT	(1 << 7) /* IrDA mode
+						  * 0 = rate upto 115.2 kbit/s
+						  *   - Only 750/760
+						  * 1 = rate upto 1.152 Mbit/s
+						  *   - Only 760
+						  */
+
+/* EFR register bits */
+#define SC16IS7XX_EFR_AUTORTS_BIT	(1 << 6) /* Auto RTS flow ctrl enable */
+#define SC16IS7XX_EFR_AUTOCTS_BIT	(1 << 7) /* Auto CTS flow ctrl enable */
+#define SC16IS7XX_EFR_XOFF2_DETECT_BIT	(1 << 5) /* Enable Xoff2 detection */
+#define SC16IS7XX_EFR_ENABLE_BIT	(1 << 4) /* Enable enhanced functions
+						  * and writing to IER[7:4],
+						  * FCR[5:4], MCR[7:5]
+						  */
+#define SC16IS7XX_EFR_SWFLOW3_BIT	(1 << 3) /* SWFLOW bit 3 */
+#define SC16IS7XX_EFR_SWFLOW2_BIT	(1 << 2) /* SWFLOW bit 2
+						  *
+						  * SWFLOW bits 3 & 2 table:
+						  * 00 -> no transmitter flow
+						  *       control
+						  * 01 -> transmitter generates
+						  *       XON2 and XOFF2
+						  * 10 -> transmitter generates
+						  *       XON1 and XOFF1
+						  * 11 -> transmitter generates
+						  *       XON1, XON2, XOFF1 and
+						  *       XOFF2
+						  */
+#define SC16IS7XX_EFR_SWFLOW1_BIT	(1 << 1) /* SWFLOW bit 2 */
+#define SC16IS7XX_EFR_SWFLOW0_BIT	(1 << 0) /* SWFLOW bit 3
+						  *
+						  * SWFLOW bits 3 & 2 table:
+						  * 00 -> no received flow
+						  *       control
+						  * 01 -> receiver compares
+						  *       XON2 and XOFF2
+						  * 10 -> receiver compares
+						  *       XON1 and XOFF1
+						  * 11 -> receiver compares
+						  *       XON1, XON2, XOFF1 and
+						  *       XOFF2
+						  */
+
+/* Misc definitions */
+#define SC16IS7XX_FIFO_SIZE		(64)
+#define SC16IS7XX_REG_SHIFT		2
+
+struct sc16is7xx_devtype {
+	char	name[10];
+	int	nr_gpio;
+	int	nr_uart;
+};
+
+struct sc16is7xx_one {
+	struct uart_port		port;
+	struct work_struct		tx_work;
+	struct work_struct		md_work;
+
+	struct serial_rs485		rs485;
+};
+
+struct sc16is7xx_port {
+	struct uart_driver		uart;
+	struct sc16is7xx_devtype	*devtype;
+	struct regmap			*regmap;
+	struct mutex			mutex;
+	struct clk			*clk;
+#ifdef CONFIG_GPIOLIB
+	struct gpio_chip		gpio;
+#endif
+	unsigned char			buf[SC16IS7XX_FIFO_SIZE];
+	struct sc16is7xx_one		p[0];
+};
+
+#define to_sc16is7xx_one(p,e)	((container_of((p), struct sc16is7xx_one, e)))
+
+static u8 sc16is7xx_port_read(struct uart_port *port, u8 reg)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	unsigned int val = 0;
+
+	regmap_read(s->regmap,
+		    (reg << SC16IS7XX_REG_SHIFT) | port->line, &val);
+
+	return val;
+}
+
+static void sc16is7xx_port_write(struct uart_port *port, u8 reg, u8 val)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+
+	regmap_write(s->regmap,
+		     (reg << SC16IS7XX_REG_SHIFT) | port->line, val);
+}
+
+static void sc16is7xx_port_update(struct uart_port *port, u8 reg,
+				  u8 mask, u8 val)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+
+	regmap_update_bits(s->regmap,
+			   (reg << SC16IS7XX_REG_SHIFT) | port->line,
+			   mask, val);
+}
+
+
+static void sc16is7xx_power(struct uart_port *port, int on)
+{
+	sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
+			      SC16IS7XX_IER_SLEEP_BIT,
+			      on ? 0 : SC16IS7XX_IER_SLEEP_BIT);
+}
+
+static const struct sc16is7xx_devtype sc16is74x_devtype = {
+	.name		= "SC16IS74X",
+	.nr_gpio	= 0,
+	.nr_uart	= 1,
+};
+
+static const struct sc16is7xx_devtype sc16is750_devtype = {
+	.name		= "SC16IS750",
+	.nr_gpio	= 8,
+	.nr_uart	= 1,
+};
+
+static const struct sc16is7xx_devtype sc16is752_devtype = {
+	.name		= "SC16IS752",
+	.nr_gpio	= 8,
+	.nr_uart	= 2,
+};
+
+static const struct sc16is7xx_devtype sc16is760_devtype = {
+	.name		= "SC16IS760",
+	.nr_gpio	= 8,
+	.nr_uart	= 1,
+};
+
+static const struct sc16is7xx_devtype sc16is762_devtype = {
+	.name		= "SC16IS762",
+	.nr_gpio	= 8,
+	.nr_uart	= 2,
+};
+
+static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg)
+{
+	switch (reg >> SC16IS7XX_REG_SHIFT) {
+	case SC16IS7XX_RHR_REG:
+	case SC16IS7XX_IIR_REG:
+	case SC16IS7XX_LSR_REG:
+	case SC16IS7XX_MSR_REG:
+	case SC16IS7XX_TXLVL_REG:
+	case SC16IS7XX_RXLVL_REG:
+	case SC16IS7XX_IOSTATE_REG:
+		return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+static bool sc16is7xx_regmap_precious(struct device *dev, unsigned int reg)
+{
+	switch (reg >> SC16IS7XX_REG_SHIFT) {
+	case SC16IS7XX_RHR_REG:
+		return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+static int sc16is7xx_set_baud(struct uart_port *port, int baud)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	u8 lcr;
+	u8 prescaler = 0;
+	unsigned long clk = port->uartclk, div = clk / 16 / baud;
+
+	if (div > 0xffff) {
+		prescaler = SC16IS7XX_MCR_CLKSEL_BIT;
+		div /= 4;
+	}
+
+	lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG);
+
+	/* Open the LCR divisors for configuration */
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+			     SC16IS7XX_LCR_CONF_MODE_B);
+
+	/* Enable enhanced features */
+	regcache_cache_bypass(s->regmap, true);
+	sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
+			     SC16IS7XX_EFR_ENABLE_BIT);
+	regcache_cache_bypass(s->regmap, false);
+
+	/* Put LCR back to the normal mode */
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
+
+	sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
+			      SC16IS7XX_MCR_CLKSEL_BIT,
+			      prescaler);
+
+	/* Open the LCR divisors for configuration */
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+			     SC16IS7XX_LCR_CONF_MODE_A);
+
+	/* Write the new divisor */
+	regcache_cache_bypass(s->regmap, true);
+	sc16is7xx_port_write(port, SC16IS7XX_DLH_REG, div / 256);
+	sc16is7xx_port_write(port, SC16IS7XX_DLL_REG, div % 256);
+	regcache_cache_bypass(s->regmap, false);
+
+	/* Put LCR back to the normal mode */
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
+
+	return DIV_ROUND_CLOSEST(clk / 16, div);
+}
+
+static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
+				unsigned int iir)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	unsigned int lsr = 0, ch, flag, bytes_read, i;
+	bool read_lsr = (iir == SC16IS7XX_IIR_RLSE_SRC) ? true : false;
+
+	if (unlikely(rxlen >= sizeof(s->buf))) {
+		dev_warn_ratelimited(port->dev,
+				     "Port %i: Possible RX FIFO overrun: %d\n",
+				     port->line, rxlen);
+		port->icount.buf_overrun++;
+		/* Ensure sanity of RX level */
+		rxlen = sizeof(s->buf);
+	}
+
+	while (rxlen) {
+		/* Only read lsr if there are possible errors in FIFO */
+		if (read_lsr) {
+			lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
+			if (!(lsr & SC16IS7XX_LSR_FIFOE_BIT))
+				read_lsr = false; /* No errors left in FIFO */
+		} else
+			lsr = 0;
+
+		if (read_lsr) {
+			s->buf[0] = sc16is7xx_port_read(port, SC16IS7XX_RHR_REG);
+			bytes_read = 1;
+		} else {
+			regcache_cache_bypass(s->regmap, true);
+			regmap_raw_read(s->regmap, SC16IS7XX_RHR_REG,
+					s->buf, rxlen);
+			regcache_cache_bypass(s->regmap, false);
+			bytes_read = rxlen;
+		}
+
+		lsr &= SC16IS7XX_LSR_BRK_ERROR_MASK;
+
+		port->icount.rx++;
+		flag = TTY_NORMAL;
+
+		if (unlikely(lsr)) {
+			if (lsr & SC16IS7XX_LSR_BI_BIT) {
+				port->icount.brk++;
+				if (uart_handle_break(port))
+					continue;
+			} else if (lsr & SC16IS7XX_LSR_PE_BIT)
+				port->icount.parity++;
+			else if (lsr & SC16IS7XX_LSR_FE_BIT)
+				port->icount.frame++;
+			else if (lsr & SC16IS7XX_LSR_OE_BIT)
+				port->icount.overrun++;
+
+			lsr &= port->read_status_mask;
+			if (lsr & SC16IS7XX_LSR_BI_BIT)
+				flag = TTY_BREAK;
+			else if (lsr & SC16IS7XX_LSR_PE_BIT)
+				flag = TTY_PARITY;
+			else if (lsr & SC16IS7XX_LSR_FE_BIT)
+				flag = TTY_FRAME;
+			else if (lsr & SC16IS7XX_LSR_OE_BIT)
+				flag = TTY_OVERRUN;
+		}
+
+		for (i = 0; i < bytes_read; ++i) {
+			ch = s->buf[i];
+			if (uart_handle_sysrq_char(port, ch))
+				continue;
+
+			if (lsr & port->ignore_status_mask)
+				continue;
+
+			uart_insert_char(port, lsr, SC16IS7XX_LSR_OE_BIT, ch,
+					 flag);
+		}
+		rxlen -= bytes_read;
+	}
+
+	tty_flip_buffer_push(&port->state->port);
+}
+
+static void sc16is7xx_handle_tx(struct uart_port *port)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	struct circ_buf *xmit = &port->state->xmit;
+	unsigned int txlen, to_send, i;
+
+	if (unlikely(port->x_char)) {
+		sc16is7xx_port_write(port, SC16IS7XX_THR_REG, port->x_char);
+		port->icount.tx++;
+		port->x_char = 0;
+		return;
+	}
+
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+		return;
+
+	/* Get length of data pending in circular buffer */
+	to_send = uart_circ_chars_pending(xmit);
+	if (likely(to_send)) {
+		/* Limit to size of TX FIFO */
+		txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
+		to_send = (to_send > txlen) ? txlen : to_send;
+
+		/* Add data to send */
+		port->icount.tx += to_send;
+
+		/* Convert to linear buffer */
+		for (i = 0; i < to_send; ++i) {
+			s->buf[i] = xmit->buf[xmit->tail];
+			xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		}
+		regcache_cache_bypass(s->regmap, true);
+		regmap_raw_write(s->regmap, SC16IS7XX_THR_REG, s->buf, to_send);
+		regcache_cache_bypass(s->regmap, false);
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+}
+
+static void sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
+{
+	struct uart_port *port = &s->p[portno].port;
+
+	do {
+		unsigned int iir, msr, rxlen;
+
+		iir = sc16is7xx_port_read(port, SC16IS7XX_IIR_REG);
+		if (iir & SC16IS7XX_IIR_NO_INT_BIT)
+			break;
+
+		iir &= SC16IS7XX_IIR_ID_MASK;
+
+		switch (iir) {
+		case SC16IS7XX_IIR_RDI_SRC:
+		case SC16IS7XX_IIR_RLSE_SRC:
+		case SC16IS7XX_IIR_RTOI_SRC:
+		case SC16IS7XX_IIR_XOFFI_SRC:
+			rxlen = sc16is7xx_port_read(port, SC16IS7XX_RXLVL_REG);
+			if (rxlen)
+				sc16is7xx_handle_rx(port, rxlen, iir);
+			break;
+
+		case SC16IS7XX_IIR_CTSRTS_SRC:
+			msr = sc16is7xx_port_read(port, SC16IS7XX_MSR_REG);
+			uart_handle_cts_change(port,
+					       !!(msr & SC16IS7XX_MSR_CTS_BIT));
+			break;
+		case SC16IS7XX_IIR_THRI_SRC:
+			mutex_lock(&s->mutex);
+			sc16is7xx_handle_tx(port);
+			mutex_unlock(&s->mutex);
+			break;
+		default:
+			dev_err_ratelimited(port->dev,
+					    "Port %i: Unexpected interrupt: %x",
+					    port->line, iir);
+			break;
+		}
+	} while (1);
+}
+
+static irqreturn_t sc16is7xx_ist(int irq, void *dev_id)
+{
+	struct sc16is7xx_port *s = (struct sc16is7xx_port *)dev_id;
+	int i;
+
+	for (i = 0; i < s->uart.nr; ++i)
+		sc16is7xx_port_irq(s, i);
+
+	return IRQ_HANDLED;
+}
+
+static void sc16is7xx_wq_proc(struct work_struct *ws)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(ws, tx_work);
+	struct sc16is7xx_port *s = dev_get_drvdata(one->port.dev);
+
+	mutex_lock(&s->mutex);
+	sc16is7xx_handle_tx(&one->port);
+	mutex_unlock(&s->mutex);
+}
+
+static void sc16is7xx_stop_tx(struct uart_port* port)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+	struct circ_buf *xmit = &one->port.state->xmit;
+
+	/* handle rs485 */
+	if (one->rs485.flags & SER_RS485_ENABLED) {
+		/* do nothing if current tx not yet completed */
+		int lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
+		if (!(lsr & SC16IS7XX_LSR_TEMT_BIT))
+			return;
+
+		if (uart_circ_empty(xmit) &&
+		    (one->rs485.delay_rts_after_send > 0))
+			mdelay(one->rs485.delay_rts_after_send);
+	}
+
+	sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
+			      SC16IS7XX_IER_THRI_BIT,
+			      0);
+}
+
+static void sc16is7xx_stop_rx(struct uart_port* port)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+	one->port.read_status_mask &= ~SC16IS7XX_LSR_DR_BIT;
+	sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
+			      SC16IS7XX_LSR_DR_BIT,
+			      0);
+}
+
+static void sc16is7xx_start_tx(struct uart_port *port)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+	/* handle rs485 */
+	if ((one->rs485.flags & SER_RS485_ENABLED) &&
+	    (one->rs485.delay_rts_before_send > 0)) {
+		mdelay(one->rs485.delay_rts_before_send);
+	}
+
+	if (!work_pending(&one->tx_work))
+		schedule_work(&one->tx_work);
+}
+
+static unsigned int sc16is7xx_tx_empty(struct uart_port *port)
+{
+	unsigned int lvl, lsr;
+
+	lvl = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
+	lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
+
+	return ((lsr & SC16IS7XX_LSR_THRE_BIT) && !lvl) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int sc16is7xx_get_mctrl(struct uart_port *port)
+{
+	/* DCD and DSR are not wired and CTS/RTS is handled automatically
+	 * so just indicate DSR and CAR asserted
+	 */
+	return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void sc16is7xx_md_proc(struct work_struct *ws)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(ws, md_work);
+
+	sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
+			      SC16IS7XX_MCR_LOOP_BIT,
+			      (one->port.mctrl & TIOCM_LOOP) ?
+				      SC16IS7XX_MCR_LOOP_BIT : 0);
+}
+
+static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+	schedule_work(&one->md_work);
+}
+
+static void sc16is7xx_break_ctl(struct uart_port *port, int break_state)
+{
+	sc16is7xx_port_update(port, SC16IS7XX_LCR_REG,
+			      SC16IS7XX_LCR_TXBREAK_BIT,
+			      break_state ? SC16IS7XX_LCR_TXBREAK_BIT : 0);
+}
+
+static void sc16is7xx_set_termios(struct uart_port *port,
+				  struct ktermios *termios,
+				  struct ktermios *old)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	unsigned int lcr, flow = 0;
+	int baud;
+
+	/* Mask termios capabilities we don't support */
+	termios->c_cflag &= ~CMSPAR;
+
+	/* Word size */
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		lcr = SC16IS7XX_LCR_WORD_LEN_5;
+		break;
+	case CS6:
+		lcr = SC16IS7XX_LCR_WORD_LEN_6;
+		break;
+	case CS7:
+		lcr = SC16IS7XX_LCR_WORD_LEN_7;
+		break;
+	case CS8:
+		lcr = SC16IS7XX_LCR_WORD_LEN_8;
+		break;
+	default:
+		lcr = SC16IS7XX_LCR_WORD_LEN_8;
+		termios->c_cflag &= ~CSIZE;
+		termios->c_cflag |= CS8;
+		break;
+	}
+
+	/* Parity */
+	if (termios->c_cflag & PARENB) {
+		lcr |= SC16IS7XX_LCR_PARITY_BIT;
+		if (!(termios->c_cflag & PARODD))
+			lcr |= SC16IS7XX_LCR_EVENPARITY_BIT;
+	}
+
+	/* Stop bits */
+	if (termios->c_cflag & CSTOPB)
+		lcr |= SC16IS7XX_LCR_STOPLEN_BIT; /* 2 stops */
+
+	/* Set read status mask */
+	port->read_status_mask = SC16IS7XX_LSR_OE_BIT;
+	if (termios->c_iflag & INPCK)
+		port->read_status_mask |= SC16IS7XX_LSR_PE_BIT |
+					  SC16IS7XX_LSR_FE_BIT;
+	if (termios->c_iflag & (BRKINT | PARMRK))
+		port->read_status_mask |= SC16IS7XX_LSR_BI_BIT;
+
+	/* Set status ignore mask */
+	port->ignore_status_mask = 0;
+	if (termios->c_iflag & IGNBRK)
+		port->ignore_status_mask |= SC16IS7XX_LSR_BI_BIT;
+	if (!(termios->c_cflag & CREAD))
+		port->ignore_status_mask |= SC16IS7XX_LSR_BRK_ERROR_MASK;
+
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+			     SC16IS7XX_LCR_CONF_MODE_B);
+
+	/* Configure flow control */
+	regcache_cache_bypass(s->regmap, true);
+	sc16is7xx_port_write(port, SC16IS7XX_XON1_REG, termios->c_cc[VSTART]);
+	sc16is7xx_port_write(port, SC16IS7XX_XOFF1_REG, termios->c_cc[VSTOP]);
+	if (termios->c_cflag & CRTSCTS)
+		flow |= SC16IS7XX_EFR_AUTOCTS_BIT |
+			SC16IS7XX_EFR_AUTORTS_BIT;
+	if (termios->c_iflag & IXON)
+		flow |= SC16IS7XX_EFR_SWFLOW3_BIT;
+	if (termios->c_iflag & IXOFF)
+		flow |= SC16IS7XX_EFR_SWFLOW1_BIT;
+
+	sc16is7xx_port_write(port, SC16IS7XX_EFR_REG, flow);
+	regcache_cache_bypass(s->regmap, false);
+
+	/* Update LCR register */
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
+
+	/* Get baud rate generator configuration */
+	baud = uart_get_baud_rate(port, termios, old,
+				  port->uartclk / 16 / 4 / 0xffff,
+				  port->uartclk / 16);
+
+	/* Setup baudrate generator */
+	baud = sc16is7xx_set_baud(port, baud);
+
+	/* Update timeout according to new baud rate */
+	uart_update_timeout(port, termios->c_cflag, baud);
+}
+
+#if defined(TIOCSRS485) && defined(TIOCGRS485)
+static void sc16is7xx_config_rs485(struct uart_port *port,
+				   struct serial_rs485 *rs485)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+	one->rs485 = *rs485;
+
+	if (one->rs485.flags & SER_RS485_ENABLED) {
+		sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
+				      SC16IS7XX_EFCR_AUTO_RS485_BIT,
+				      SC16IS7XX_EFCR_AUTO_RS485_BIT);
+	} else {
+		sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
+				      SC16IS7XX_EFCR_AUTO_RS485_BIT,
+				      0);
+	}
+}
+#endif
+
+static int sc16is7xx_ioctl(struct uart_port *port, unsigned int cmd,
+			   unsigned long arg)
+{
+#if defined(TIOCSRS485) && defined(TIOCGRS485)
+	struct serial_rs485 rs485;
+
+	switch (cmd) {
+	case TIOCSRS485:
+		if (copy_from_user(&rs485, (void __user *)arg, sizeof(rs485)))
+			return -EFAULT;
+
+		sc16is7xx_config_rs485(port, &rs485);
+		return 0;
+	case TIOCGRS485:
+		if (copy_to_user((void __user *)arg,
+				 &(to_sc16is7xx_one(port, port)->rs485),
+				 sizeof(rs485)))
+			return -EFAULT;
+		return 0;
+	default:
+		break;
+	}
+#endif
+
+	return -ENOIOCTLCMD;
+}
+
+static int sc16is7xx_startup(struct uart_port *port)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	unsigned int val;
+
+	sc16is7xx_power(port, 1);
+
+	/* Reset FIFOs*/
+	val = SC16IS7XX_FCR_RXRESET_BIT | SC16IS7XX_FCR_TXRESET_BIT;
+	sc16is7xx_port_write(port, SC16IS7XX_FCR_REG, val);
+	udelay(5);
+	sc16is7xx_port_write(port, SC16IS7XX_FCR_REG,
+			     SC16IS7XX_FCR_FIFO_BIT);
+
+	/* Enable EFR */
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+			     SC16IS7XX_LCR_CONF_MODE_B);
+
+	regcache_cache_bypass(s->regmap, true);
+
+	/* Enable write access to enhanced features and internal clock div */
+	sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
+			     SC16IS7XX_EFR_ENABLE_BIT);
+
+	/* Enable TCR/TLR */
+	sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
+			      SC16IS7XX_MCR_TCRTLR_BIT,
+			      SC16IS7XX_MCR_TCRTLR_BIT);
+
+	/* Configure flow control levels */
+	/* Flow control halt level 48, resume level 24 */
+	sc16is7xx_port_write(port, SC16IS7XX_TCR_REG,
+			     SC16IS7XX_TCR_RX_RESUME(24) |
+			     SC16IS7XX_TCR_RX_HALT(48));
+
+	regcache_cache_bypass(s->regmap, false);
+
+	/* Now, initialize the UART */
+	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, SC16IS7XX_LCR_WORD_LEN_8);
+
+	/* Enable the Rx and Tx FIFO */
+	sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
+			      SC16IS7XX_EFCR_RXDISABLE_BIT |
+			      SC16IS7XX_EFCR_TXDISABLE_BIT,
+			      0);
+
+	/* Enable RX, TX, CTS change interrupts */
+	val = SC16IS7XX_IER_RDI_BIT | SC16IS7XX_IER_THRI_BIT |
+	      SC16IS7XX_IER_CTSI_BIT;
+	sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val);
+
+	return 0;
+}
+
+static void sc16is7xx_shutdown(struct uart_port *port)
+{
+	/* Disable all interrupts */
+	sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
+	/* Disable TX/RX */
+	sc16is7xx_port_write(port, SC16IS7XX_EFCR_REG,
+			     SC16IS7XX_EFCR_RXDISABLE_BIT |
+			     SC16IS7XX_EFCR_TXDISABLE_BIT);
+
+	sc16is7xx_power(port, 0);
+}
+
+static const char *sc16is7xx_type(struct uart_port *port)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+
+	return (port->type == PORT_SC16IS7XX) ? s->devtype->name : NULL;
+}
+
+static int sc16is7xx_request_port(struct uart_port *port)
+{
+	/* Do nothing */
+	return 0;
+}
+
+static void sc16is7xx_config_port(struct uart_port *port, int flags)
+{
+	if (flags & UART_CONFIG_TYPE)
+		port->type = PORT_SC16IS7XX;
+}
+
+static int sc16is7xx_verify_port(struct uart_port *port,
+				 struct serial_struct *s)
+{
+	if ((s->type != PORT_UNKNOWN) && (s->type != PORT_SC16IS7XX))
+		return -EINVAL;
+	if (s->irq != port->irq)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void sc16is7xx_pm(struct uart_port *port, unsigned int state,
+			 unsigned int oldstate)
+{
+	sc16is7xx_power(port, (state == UART_PM_STATE_ON) ? 1 : 0);
+}
+
+static void sc16is7xx_null_void(struct uart_port *port)
+{
+	/* Do nothing */
+}
+
+static const struct uart_ops sc16is7xx_ops = {
+	.tx_empty	= sc16is7xx_tx_empty,
+	.set_mctrl	= sc16is7xx_set_mctrl,
+	.get_mctrl	= sc16is7xx_get_mctrl,
+	.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,
+	.set_termios	= sc16is7xx_set_termios,
+	.type		= sc16is7xx_type,
+	.request_port	= sc16is7xx_request_port,
+	.release_port	= sc16is7xx_null_void,
+	.config_port	= sc16is7xx_config_port,
+	.verify_port	= sc16is7xx_verify_port,
+	.ioctl		= sc16is7xx_ioctl,
+	.pm		= sc16is7xx_pm,
+};
+
+#ifdef CONFIG_GPIOLIB
+static int sc16is7xx_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	unsigned int val;
+	struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+						gpio);
+	struct uart_port *port = &s->p[0].port;
+
+	val = sc16is7xx_port_read(port, SC16IS7XX_IOSTATE_REG);
+
+	return !!(val & BIT(offset));
+}
+
+static void sc16is7xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+	struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+						gpio);
+	struct uart_port *port = &s->p[0].port;
+
+	sc16is7xx_port_update(port, SC16IS7XX_IOSTATE_REG, BIT(offset),
+			      val ? BIT(offset) : 0);
+}
+
+static int sc16is7xx_gpio_direction_input(struct gpio_chip *chip,
+					  unsigned offset)
+{
+	struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+						gpio);
+	struct uart_port *port = &s->p[0].port;
+
+	sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset), 0);
+
+	return 0;
+}
+
+static int sc16is7xx_gpio_direction_output(struct gpio_chip *chip,
+					   unsigned offset, int val)
+{
+	struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+						gpio);
+	struct uart_port *port = &s->p[0].port;
+
+	sc16is7xx_port_update(port, SC16IS7XX_IOSTATE_REG, BIT(offset),
+			      val ? BIT(offset) : 0);
+	sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset),
+			      BIT(offset));
+
+	return 0;
+}
+#endif
+
+static int sc16is7xx_probe(struct device *dev,
+			   struct sc16is7xx_devtype *devtype,
+			   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;
+
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	/* Alloc port structure */
+	s = devm_kzalloc(dev, sizeof(*s) +
+			 sizeof(struct sc16is7xx_one) * devtype->nr_uart,
+			 GFP_KERNEL);
+	if (!s) {
+		dev_err(dev, "Error allocating port structure\n");
+		return -ENOMEM;
+	}
+
+	clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(clk)) {
+		if (pfreq)
+			freq = *pfreq;
+		else
+			return PTR_ERR(clk);
+	} else {
+		freq = clk_get_rate(clk);
+	}
+
+	s->regmap = regmap;
+	s->devtype = devtype;
+	dev_set_drvdata(dev, s);
+
+	/* Register UART driver */
+	s->uart.owner		= THIS_MODULE;
+	s->uart.dev_name	= "ttySC";
+	s->uart.nr		= devtype->nr_uart;
+	ret = uart_register_driver(&s->uart);
+	if (ret) {
+		dev_err(dev, "Registering UART driver failed\n");
+		goto out_clk;
+	}
+
+#ifdef CONFIG_GPIOLIB
+	if (devtype->nr_gpio) {
+		/* Setup GPIO cotroller */
+		s->gpio.owner		 = THIS_MODULE;
+		s->gpio.dev		 = dev;
+		s->gpio.label		 = dev_name(dev);
+		s->gpio.direction_input	 = sc16is7xx_gpio_direction_input;
+		s->gpio.get		 = sc16is7xx_gpio_get;
+		s->gpio.direction_output = sc16is7xx_gpio_direction_output;
+		s->gpio.set		 = sc16is7xx_gpio_set;
+		s->gpio.base		 = -1;
+		s->gpio.ngpio		 = devtype->nr_gpio;
+		s->gpio.can_sleep	 = 1;
+		ret = gpiochip_add(&s->gpio);
+		if (ret)
+			goto out_uart;
+	}
+#endif
+
+	mutex_init(&s->mutex);
+
+	for (i = 0; i < devtype->nr_uart; ++i) {
+		/* Initialize port data */
+		s->p[i].port.line	= i;
+		s->p[i].port.dev	= dev;
+		s->p[i].port.irq	= irq;
+		s->p[i].port.type	= PORT_SC16IS7XX;
+		s->p[i].port.fifosize	= SC16IS7XX_FIFO_SIZE;
+		s->p[i].port.flags	= UPF_FIXED_TYPE | UPF_LOW_LATENCY;
+		s->p[i].port.iotype	= UPIO_PORT;
+		s->p[i].port.uartclk	= freq;
+		s->p[i].port.ops	= &sc16is7xx_ops;
+		/* Disable all interrupts */
+		sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_IER_REG, 0);
+		/* Disable TX/RX */
+		sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_EFCR_REG,
+				     SC16IS7XX_EFCR_RXDISABLE_BIT |
+				     SC16IS7XX_EFCR_TXDISABLE_BIT);
+		/* Initialize queue for start TX */
+		INIT_WORK(&s->p[i].tx_work, sc16is7xx_wq_proc);
+		/* Initialize queue for changing mode */
+		INIT_WORK(&s->p[i].md_work, sc16is7xx_md_proc);
+		/* Register port */
+		uart_add_one_port(&s->uart, &s->p[i].port);
+		/* Go to suspend mode */
+		sc16is7xx_power(&s->p[i].port, 0);
+	}
+
+	/* Setup interrupt */
+	ret = devm_request_threaded_irq(dev, irq, NULL, sc16is7xx_ist,
+					IRQF_ONESHOT | flags, dev_name(dev), s);
+	if (!ret)
+		return 0;
+
+	mutex_destroy(&s->mutex);
+
+#ifdef CONFIG_GPIOLIB
+	if (devtype->nr_gpio)
+		WARN_ON(gpiochip_remove(&s->gpio));
+
+out_uart:
+#endif
+	uart_unregister_driver(&s->uart);
+
+out_clk:
+	if (!IS_ERR(s->clk))
+		clk_disable_unprepare(s->clk);
+
+	return ret;
+}
+
+static int sc16is7xx_remove(struct device *dev)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(dev);
+	int i, ret = 0;
+
+#ifdef CONFIG_GPIOLIB
+	if (s->devtype->nr_gpio) {
+		ret = gpiochip_remove(&s->gpio);
+		if (ret)
+			return ret;
+	}
+#endif
+
+	for (i = 0; i < s->uart.nr; i++) {
+		cancel_work_sync(&s->p[i].tx_work);
+		cancel_work_sync(&s->p[i].md_work);
+		uart_remove_one_port(&s->uart, &s->p[i].port);
+		sc16is7xx_power(&s->p[i].port, 0);
+	}
+
+	mutex_destroy(&s->mutex);
+	uart_unregister_driver(&s->uart);
+	if (!IS_ERR(s->clk))
+		clk_disable_unprepare(s->clk);
+
+	return ret;
+}
+
+static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
+	{ .compatible = "nxp,sc16is740",	.data = &sc16is74x_devtype, },
+	{ .compatible = "nxp,sc16is741",	.data = &sc16is74x_devtype, },
+	{ .compatible = "nxp,sc16is750",	.data = &sc16is750_devtype, },
+	{ .compatible = "nxp,sc16is752",	.data = &sc16is752_devtype, },
+	{ .compatible = "nxp,sc16is760",	.data = &sc16is760_devtype, },
+	{ .compatible = "nxp,sc16is762",	.data = &sc16is762_devtype, },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sc16is7xx_dt_ids);
+
+static struct regmap_config regcfg = {
+	.reg_bits = 7,
+	.pad_bits = 1,
+	.val_bits = 8,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = sc16is7xx_regmap_volatile,
+	.precious_reg = sc16is7xx_regmap_precious,
+};
+
+static int sc16is7xx_i2c_probe(struct i2c_client *i2c,
+			       const struct i2c_device_id *id)
+{
+	struct sc16is7xx_devtype *devtype;
+	unsigned long flags = 0;
+	struct regmap *regmap;
+
+	if (i2c->dev.of_node) {
+		const struct of_device_id *of_id =
+				of_match_device(sc16is7xx_dt_ids, &i2c->dev);
+
+		devtype = (struct sc16is7xx_devtype *)of_id->data;
+	} else {
+		devtype = (struct sc16is7xx_devtype *)id->driver_data;
+		flags = IRQF_TRIGGER_FALLING;
+	}
+
+	regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
+			      (devtype->nr_uart - 1);
+	regmap = devm_regmap_init_i2c(i2c, &regcfg);
+
+	return sc16is7xx_probe(&i2c->dev, devtype, regmap, i2c->irq, flags);
+}
+
+static int sc16is7xx_i2c_remove(struct i2c_client *client)
+{
+	return sc16is7xx_remove(&client->dev);
+}
+
+static const struct i2c_device_id sc16is7xx_i2c_id_table[] = {
+	{ "sc16is74x",	(kernel_ulong_t)&sc16is74x_devtype, },
+	{ "sc16is750",	(kernel_ulong_t)&sc16is750_devtype, },
+	{ "sc16is752",	(kernel_ulong_t)&sc16is752_devtype, },
+	{ "sc16is760",	(kernel_ulong_t)&sc16is760_devtype, },
+	{ "sc16is762",	(kernel_ulong_t)&sc16is762_devtype, },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table);
+
+static struct i2c_driver sc16is7xx_i2c_uart_driver = {
+	.driver = {
+		.name		= SC16IS7XX_NAME,
+		.owner		= THIS_MODULE,
+		.of_match_table	= of_match_ptr(sc16is7xx_dt_ids),
+	},
+	.probe		= sc16is7xx_i2c_probe,
+	.remove		= sc16is7xx_i2c_remove,
+	.id_table	= sc16is7xx_i2c_id_table,
+};
+module_i2c_driver(sc16is7xx_i2c_uart_driver);
+MODULE_ALIAS("i2c:sc16is7xx");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jon Ringle <jringle@gridpoint.com>");
+MODULE_DESCRIPTION("SC16IS7XX serial driver");
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
index a447f71..5443b46 100644
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -474,9 +474,7 @@ static void sccnxp_timer(unsigned long data)
 	sccnxp_handle_events(s);
 	spin_unlock_irqrestore(&s->lock, flags);
 
-	if (!timer_pending(&s->timer))
-		mod_timer(&s->timer, jiffies +
-			  usecs_to_jiffies(s->pdata.poll_time_us));
+	mod_timer(&s->timer, jiffies + usecs_to_jiffies(s->pdata.poll_time_us));
 }
 
 static irqreturn_t sccnxp_ist(int irq, void *dev_id)
@@ -674,6 +672,8 @@ static void sccnxp_set_termios(struct uart_port *port,
 	port->ignore_status_mask = 0;
 	if (termios->c_iflag & IGNBRK)
 		port->ignore_status_mask |= SR_BRK;
+	if (termios->c_iflag & IGNPAR)
+		port->ignore_status_mask |= SR_PE;
 	if (!(termios->c_cflag & CREAD))
 		port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK;
 
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index b68550d..fbf6c5a 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -174,8 +174,12 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
 			if (tty->termios.c_cflag & CBAUD)
 				uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
 		}
-
-		if (tty_port_cts_enabled(port)) {
+		/*
+		 * if hw support flow control without software intervention,
+		 * then skip the below check
+		 */
+		if (tty_port_cts_enabled(port) &&
+		    !(uport->flags & UPF_HARD_FLOW)) {
 			spin_lock_irq(&uport->lock);
 			if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS))
 				tty->hw_stopped = 1;
@@ -2239,6 +2243,9 @@ static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
 		return;
 
 	port = state->uart_port;
+
+	if (ch == '\n')
+		port->ops->poll_put_char(port, '\r');
 	port->ops->poll_put_char(port, ch);
 }
 #endif
@@ -2772,7 +2779,9 @@ void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
 
 	uport->icount.cts++;
 
-	if (tty_port_cts_enabled(port)) {
+	/* skip below code if the hw flow control is supported */
+	if (tty_port_cts_enabled(port) &&
+	    !(uport->flags & UPF_HARD_FLOW)) {
 		if (tty->hw_stopped) {
 			if (status) {
 				tty->hw_stopped = 0;
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
new file mode 100644
index 0000000..bf9560f
--- /dev/null
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -0,0 +1,143 @@
+/*
+ * Helpers for controlling modem lines via GPIO
+ *
+ * Copyright (C) 2014 Paratronic S.A.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <uapi/asm-generic/termios.h>
+
+#include "serial_mctrl_gpio.h"
+
+struct mctrl_gpios {
+	struct gpio_desc *gpio[UART_GPIO_MAX];
+};
+
+static const struct {
+	const char *name;
+	unsigned int mctrl;
+	bool dir_out;
+} mctrl_gpios_desc[UART_GPIO_MAX] = {
+	{ "cts", TIOCM_CTS, false, },
+	{ "dsr", TIOCM_DSR, false, },
+	{ "dcd", TIOCM_CD, false, },
+	{ "rng", TIOCM_RNG, false, },
+	{ "rts", TIOCM_RTS, true, },
+	{ "dtr", TIOCM_DTR, true, },
+	{ "out1", TIOCM_OUT1, true, },
+	{ "out2", TIOCM_OUT2, true, },
+};
+
+void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
+{
+	enum mctrl_gpio_idx i;
+
+	if (IS_ERR_OR_NULL(gpios))
+		return;
+
+	for (i = 0; i < UART_GPIO_MAX; i++)
+		if (!IS_ERR_OR_NULL(gpios->gpio[i]) &&
+		    mctrl_gpios_desc[i].dir_out)
+			gpiod_set_value(gpios->gpio[i],
+					!!(mctrl & mctrl_gpios_desc[i].mctrl));
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_set);
+
+struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
+				      enum mctrl_gpio_idx gidx)
+{
+	if (!IS_ERR_OR_NULL(gpios) && !IS_ERR_OR_NULL(gpios->gpio[gidx]))
+		return gpios->gpio[gidx];
+	else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod);
+
+unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
+{
+	enum mctrl_gpio_idx i;
+
+	/*
+	 * return it unchanged if the structure is not allocated
+	 */
+	if (IS_ERR_OR_NULL(gpios))
+		return *mctrl;
+
+	for (i = 0; i < UART_GPIO_MAX; i++) {
+		if (!IS_ERR_OR_NULL(gpios->gpio[i]) &&
+		    !mctrl_gpios_desc[i].dir_out) {
+			if (gpiod_get_value(gpios->gpio[i]))
+				*mctrl |= mctrl_gpios_desc[i].mctrl;
+			else
+				*mctrl &= ~mctrl_gpios_desc[i].mctrl;
+		}
+	}
+
+	return *mctrl;
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_get);
+
+struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx)
+{
+	struct mctrl_gpios *gpios;
+	enum mctrl_gpio_idx i;
+	int err;
+
+	gpios = devm_kzalloc(dev, sizeof(*gpios), GFP_KERNEL);
+	if (!gpios)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < UART_GPIO_MAX; i++) {
+		gpios->gpio[i] = devm_gpiod_get_index(dev,
+						      mctrl_gpios_desc[i].name,
+						      idx);
+
+		/*
+		 * The GPIOs are maybe not all filled,
+		 * this is not an error.
+		 */
+		if (IS_ERR_OR_NULL(gpios->gpio[i]))
+			continue;
+
+		if (mctrl_gpios_desc[i].dir_out)
+			err = gpiod_direction_output(gpios->gpio[i], 0);
+		else
+			err = gpiod_direction_input(gpios->gpio[i]);
+		if (err) {
+			dev_dbg(dev, "Unable to set direction for %s GPIO",
+				mctrl_gpios_desc[i].name);
+			devm_gpiod_put(dev, gpios->gpio[i]);
+			gpios->gpio[i] = NULL;
+		}
+	}
+
+	return gpios;
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_init);
+
+void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
+{
+	enum mctrl_gpio_idx i;
+
+	if (IS_ERR_OR_NULL(gpios))
+		return;
+
+	for (i = 0; i < UART_GPIO_MAX; i++)
+		if (!IS_ERR_OR_NULL(gpios->gpio[i]))
+			devm_gpiod_put(dev, gpios->gpio[i]);
+	devm_kfree(dev, gpios);
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_free);
diff --git a/drivers/tty/serial/serial_mctrl_gpio.h b/drivers/tty/serial/serial_mctrl_gpio.h
new file mode 100644
index 0000000..400ba04
--- /dev/null
+++ b/drivers/tty/serial/serial_mctrl_gpio.h
@@ -0,0 +1,110 @@
+/*
+ * Helpers for controlling modem lines via GPIO
+ *
+ * Copyright (C) 2014 Paratronic S.A.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __SERIAL_MCTRL_GPIO__
+#define __SERIAL_MCTRL_GPIO__
+
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+
+enum mctrl_gpio_idx {
+	UART_GPIO_CTS,
+	UART_GPIO_DSR,
+	UART_GPIO_DCD,
+	UART_GPIO_RNG,
+	UART_GPIO_RI = UART_GPIO_RNG,
+	UART_GPIO_RTS,
+	UART_GPIO_DTR,
+	UART_GPIO_OUT1,
+	UART_GPIO_OUT2,
+	UART_GPIO_MAX,
+};
+
+/*
+ * Opaque descriptor for modem lines controlled by GPIOs
+ */
+struct mctrl_gpios;
+
+#ifdef CONFIG_GPIOLIB
+
+/*
+ * Set state of the modem control output lines via GPIOs.
+ */
+void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl);
+
+/*
+ * Get state of the modem control output lines from GPIOs.
+ * The mctrl flags are updated and returned.
+ */
+unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl);
+
+/*
+ * Returns the associated struct gpio_desc to the modem line gidx
+ */
+struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
+				      enum mctrl_gpio_idx gidx);
+
+/*
+ * Request and set direction of modem control lines GPIOs.
+ * devm_* functions are used, so there's no need to call mctrl_gpio_free().
+ * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
+ * allocation error.
+ */
+struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx);
+
+/*
+ * Free the mctrl_gpios structure.
+ * Normally, this function will not be called, as the GPIOs will
+ * be disposed of by the resource management code.
+ */
+void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios);
+
+#else /* GPIOLIB */
+
+static inline
+void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
+{
+}
+
+static inline
+unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
+{
+	return *mctrl;
+}
+
+static inline
+struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
+				      enum mctrl_gpio_idx gidx)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline
+struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline
+void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
+{
+}
+
+#endif /* GPIOLIB */
+
+#endif
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index 90a080b..60f49b9 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -535,13 +535,8 @@ static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
 	wait_for_xmitr(up);
 	/*
 	 *	Send the character out.
-	 *	If a LF, also do CR...
 	 */
 	sio_out(up, TXX9_SITFIFO, c);
-	if (c == 10) {
-		wait_for_xmitr(up);
-		sio_out(up, TXX9_SITFIFO, 13);
-	}
 
 	/*
 	 *	Finally, wait for transmitter to become empty
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 68b0fd4..1f2be48 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -358,9 +358,11 @@ static irqreturn_t sirfsoc_uart_usp_cts_handler(int irq, void *dev_id)
 {
 	struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)dev_id;
 	struct uart_port *port = &sirfport->port;
+	spin_lock(&port->lock);
 	if (gpio_is_valid(sirfport->cts_gpio) && sirfport->ms_enabled)
 		uart_handle_cts_change(port,
 				!gpio_get_value(sirfport->cts_gpio));
+	spin_unlock(&port->lock);
 	return IRQ_HANDLED;
 }
 
@@ -428,10 +430,6 @@ sirfsoc_uart_pio_rx_chars(struct uart_port *port, unsigned int max_rx_count)
 	sirfport->rx_io_count += rx_count;
 	port->icount.rx += rx_count;
 
-	spin_unlock(&port->lock);
-	tty_flip_buffer_push(&port->state->port);
-	spin_lock(&port->lock);
-
 	return rx_count;
 }
 
@@ -465,6 +463,7 @@ static void sirfsoc_uart_tx_dma_complete_callback(void *param)
 	struct circ_buf *xmit = &port->state->xmit;
 	unsigned long flags;
 
+	spin_lock_irqsave(&port->lock, flags);
 	xmit->tail = (xmit->tail + sirfport->transfer_size) &
 				(UART_XMIT_SIZE - 1);
 	port->icount.tx += sirfport->transfer_size;
@@ -473,10 +472,9 @@ static void sirfsoc_uart_tx_dma_complete_callback(void *param)
 	if (sirfport->tx_dma_addr)
 		dma_unmap_single(port->dev, sirfport->tx_dma_addr,
 				sirfport->transfer_size, DMA_TO_DEVICE);
-	spin_lock_irqsave(&sirfport->tx_lock, flags);
 	sirfport->tx_dma_state = TX_DMA_IDLE;
 	sirfsoc_uart_tx_with_dma(sirfport);
-	spin_unlock_irqrestore(&sirfport->tx_lock, flags);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void sirfsoc_uart_insert_rx_buf_to_tty(
@@ -489,7 +487,6 @@ static void sirfsoc_uart_insert_rx_buf_to_tty(
 	inserted = tty_insert_flip_string(tport,
 		sirfport->rx_dma_items[sirfport->rx_completed].xmit.buf, count);
 	port->icount.rx += inserted;
-	tty_flip_buffer_push(tport);
 }
 
 static void sirfsoc_rx_submit_one_dma_desc(struct uart_port *port, int index)
@@ -525,7 +522,7 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
 	unsigned long flags;
 	struct dma_tx_state tx_state;
 
-	spin_lock_irqsave(&sirfport->rx_lock, flags);
+	spin_lock_irqsave(&port->lock, flags);
 	while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
 		sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
 		sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
@@ -541,12 +538,8 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
 	wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
 			rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) |
 			SIRFUART_IO_MODE);
-	spin_unlock_irqrestore(&sirfport->rx_lock, flags);
-	spin_lock(&port->lock);
 	sirfsoc_uart_pio_rx_chars(port, 4 - sirfport->rx_io_count);
-	spin_unlock(&port->lock);
 	if (sirfport->rx_io_count == 4) {
-		spin_lock_irqsave(&sirfport->rx_lock, flags);
 		sirfport->rx_io_count = 0;
 		wr_regl(port, ureg->sirfsoc_int_st_reg,
 				uint_st->sirfsoc_rx_done);
@@ -557,11 +550,8 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
 		else
 			wr_regl(port, SIRFUART_INT_EN_CLR,
 					uint_en->sirfsoc_rx_done_en);
-		spin_unlock_irqrestore(&sirfport->rx_lock, flags);
-
 		sirfsoc_uart_start_next_rx_dma(port);
 	} else {
-		spin_lock_irqsave(&sirfport->rx_lock, flags);
 		wr_regl(port, ureg->sirfsoc_int_st_reg,
 				uint_st->sirfsoc_rx_done);
 		if (!sirfport->is_marco)
@@ -571,8 +561,9 @@ static void sirfsoc_rx_tmo_process_tl(unsigned long param)
 		else
 			wr_regl(port, ureg->sirfsoc_int_en_reg,
 					uint_en->sirfsoc_rx_done_en);
-		spin_unlock_irqrestore(&sirfport->rx_lock, flags);
 	}
+	spin_unlock_irqrestore(&port->lock, flags);
+	tty_flip_buffer_push(&port->state->port);
 }
 
 static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
@@ -581,8 +572,6 @@ static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
 	struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
 	struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
 	struct dma_tx_state tx_state;
-	spin_lock(&sirfport->rx_lock);
-
 	dmaengine_tx_status(sirfport->rx_dma_chan,
 		sirfport->rx_dma_items[sirfport->rx_issued].cookie, &tx_state);
 	dmaengine_terminate_all(sirfport->rx_dma_chan);
@@ -595,7 +584,6 @@ static void sirfsoc_uart_handle_rx_tmo(struct sirfsoc_uart_port *sirfport)
 	else
 		wr_regl(port, SIRFUART_INT_EN_CLR,
 				uint_en->sirfsoc_rx_timeout_en);
-	spin_unlock(&sirfport->rx_lock);
 	tasklet_schedule(&sirfport->rx_tmo_process_tasklet);
 }
 
@@ -659,7 +647,6 @@ static irqreturn_t sirfsoc_uart_isr(int irq, void *dev_id)
 		intr_status &= port->read_status_mask;
 		uart_insert_char(port, intr_status,
 					uint_en->sirfsoc_rx_oflow_en, 0, flag);
-		tty_flip_buffer_push(&state->port);
 	}
 recv_char:
 	if ((sirfport->uart_reg->uart_type == SIRF_REAL_UART) &&
@@ -684,6 +671,9 @@ recv_char:
 			sirfsoc_uart_pio_rx_chars(port,
 					SIRFSOC_UART_IO_RX_MAX_CNT);
 	}
+	spin_unlock(&port->lock);
+	tty_flip_buffer_push(&state->port);
+	spin_lock(&port->lock);
 	if (intr_status & uint_st->sirfsoc_txfifo_empty) {
 		if (sirfport->tx_dma_chan)
 			sirfsoc_uart_tx_with_dma(sirfport);
@@ -702,6 +692,7 @@ recv_char:
 		}
 	}
 	spin_unlock(&port->lock);
+
 	return IRQ_HANDLED;
 }
 
@@ -713,7 +704,7 @@ static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param)
 	struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
 	unsigned long flags;
 	struct dma_tx_state tx_state;
-	spin_lock_irqsave(&sirfport->rx_lock, flags);
+	spin_lock_irqsave(&port->lock, flags);
 	while (DMA_COMPLETE == dmaengine_tx_status(sirfport->rx_dma_chan,
 			sirfport->rx_dma_items[sirfport->rx_completed].cookie, &tx_state)) {
 		sirfsoc_uart_insert_rx_buf_to_tty(sirfport,
@@ -726,17 +717,20 @@ static void sirfsoc_uart_rx_dma_complete_tl(unsigned long param)
 			sirfport->rx_completed++;
 		sirfport->rx_completed %= SIRFSOC_RX_LOOP_BUF_CNT;
 	}
-	spin_unlock_irqrestore(&sirfport->rx_lock, flags);
+	spin_unlock_irqrestore(&port->lock, flags);
+	tty_flip_buffer_push(&port->state->port);
 }
 
 static void sirfsoc_uart_rx_dma_complete_callback(void *param)
 {
 	struct sirfsoc_uart_port *sirfport = (struct sirfsoc_uart_port *)param;
-	spin_lock(&sirfport->rx_lock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&sirfport->port.lock, flags);
 	sirfport->rx_issued++;
 	sirfport->rx_issued %= SIRFSOC_RX_LOOP_BUF_CNT;
-	spin_unlock(&sirfport->rx_lock);
 	tasklet_schedule(&sirfport->rx_dma_complete_tasklet);
+	spin_unlock_irqrestore(&sirfport->port.lock, flags);
 }
 
 /* submit rx dma task into dmaengine */
@@ -745,18 +739,14 @@ static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
 	struct sirfsoc_uart_port *sirfport = to_sirfport(port);
 	struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
 	struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
-	unsigned long flags;
 	int i;
-	spin_lock_irqsave(&sirfport->rx_lock, flags);
 	sirfport->rx_io_count = 0;
 	wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl,
 		rd_regl(port, ureg->sirfsoc_rx_dma_io_ctrl) &
 		~SIRFUART_IO_MODE);
-	spin_unlock_irqrestore(&sirfport->rx_lock, flags);
 	for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
 		sirfsoc_rx_submit_one_dma_desc(port, i);
 	sirfport->rx_completed = sirfport->rx_issued = 0;
-	spin_lock_irqsave(&sirfport->rx_lock, flags);
 	if (!sirfport->is_marco)
 		wr_regl(port, ureg->sirfsoc_int_en_reg,
 				rd_regl(port, ureg->sirfsoc_int_en_reg) |
@@ -764,7 +754,6 @@ static void sirfsoc_uart_start_next_rx_dma(struct uart_port *port)
 	else
 		wr_regl(port, ureg->sirfsoc_int_en_reg,
 			SIRFUART_RX_DMA_INT_EN(port, uint_en));
-	spin_unlock_irqrestore(&sirfport->rx_lock, flags);
 }
 
 static void sirfsoc_uart_start_rx(struct uart_port *port)
@@ -1228,7 +1217,7 @@ static void sirfsoc_uart_console_putchar(struct uart_port *port, int ch)
 	while (rd_regl(port,
 		ureg->sirfsoc_tx_fifo_status) & ufifo_st->ff_full(port->line))
 		cpu_relax();
-	wr_regb(port, ureg->sirfsoc_tx_fifo_data, ch);
+	wr_regl(port, ureg->sirfsoc_tx_fifo_data, ch);
 }
 
 static void sirfsoc_uart_console_write(struct console *co, const char *s,
@@ -1369,8 +1358,6 @@ usp_no_flow_control:
 		ret = -EFAULT;
 		goto err;
 	}
-	spin_lock_init(&sirfport->rx_lock);
-	spin_lock_init(&sirfport->tx_lock);
 	tasklet_init(&sirfport->rx_dma_complete_tasklet,
 			sirfsoc_uart_rx_dma_complete_tl, (unsigned long)sirfport);
 	tasklet_init(&sirfport->rx_tmo_process_tasklet,
diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
index 8a6edda..69a62eb 100644
--- a/drivers/tty/serial/sirfsoc_uart.h
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -424,8 +424,6 @@ struct sirfsoc_uart_port {
 	struct dma_chan			*tx_dma_chan;
 	dma_addr_t			tx_dma_addr;
 	struct dma_async_tx_descriptor	*tx_dma_desc;
-	spinlock_t			rx_lock;
-	spinlock_t			tx_lock;
 	struct tasklet_struct		rx_dma_complete_tasklet;
 	struct tasklet_struct		rx_tmo_process_tasklet;
 	unsigned int			rx_io_count;
@@ -441,9 +439,7 @@ struct sirfsoc_uart_port {
 
 /* Register Access Control */
 #define portaddr(port, reg)		((port)->membase + (reg))
-#define rd_regb(port, reg)		(__raw_readb(portaddr(port, reg)))
 #define rd_regl(port, reg)		(__raw_readl(portaddr(port, reg)))
-#define wr_regb(port, reg, val)		__raw_writeb(val, portaddr(port, reg))
 #define wr_regl(port, reg, val)		__raw_writel(val, portaddr(port, reg))
 
 /* UART Port Mask */
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index dd3a96e..c7f61ac 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -194,9 +194,9 @@ static inline u32 asc_txfifo_is_empty(struct uart_port *port)
 	return asc_in(port, ASC_STA) & ASC_STA_TE;
 }
 
-static inline int asc_txfifo_is_full(struct uart_port *port)
+static inline u32 asc_txfifo_is_half_empty(struct uart_port *port)
 {
-	return asc_in(port, ASC_STA) & ASC_STA_TF;
+	return asc_in(port, ASC_STA) & ASC_STA_THE;
 }
 
 static inline const char *asc_port_name(struct uart_port *port)
@@ -628,7 +628,7 @@ static int asc_get_poll_char(struct uart_port *port)
 
 static void asc_put_poll_char(struct uart_port *port, unsigned char c)
 {
-	while (asc_txfifo_is_full(port))
+	while (!asc_txfifo_is_half_empty(port))
 		cpu_relax();
 	asc_out(port, ASC_TXBUF, c);
 }
@@ -783,7 +783,7 @@ static void asc_console_putchar(struct uart_port *port, int ch)
 	unsigned int timeout = 1000000;
 
 	/* Wait for upto 1 second in case flow control is stopping us. */
-	while (--timeout && asc_txfifo_is_full(port))
+	while (--timeout && !asc_txfifo_is_half_empty(port))
 		udelay(1);
 
 	asc_out(port, ASC_TXBUF, ch);
diff --git a/drivers/tty/serial/tilegx.c b/drivers/tty/serial/tilegx.c
index f92d7e6..613ccf0 100644
--- a/drivers/tty/serial/tilegx.c
+++ b/drivers/tty/serial/tilegx.c
@@ -359,8 +359,8 @@ static int tilegx_startup(struct uart_port *port)
 		}
 
 		/* Create our IRQs. */
-		port->irq = create_irq();
-		if (port->irq < 0)
+		port->irq = irq_alloc_hwirq(-1);
+		if (!port->irq)
 			goto err_uart_dest;
 		tile_irq_activate(port->irq, TILE_IRQ_PERCPU);
 
@@ -395,7 +395,7 @@ static int tilegx_startup(struct uart_port *port)
 err_free_irq:
 	free_irq(port->irq, port);
 err_dest_irq:
-	destroy_irq(port->irq);
+	irq_free_hwirq(port->irq);
 err_uart_dest:
 	gxio_uart_destroy(context);
 	ret = -ENXIO;
@@ -435,7 +435,7 @@ static void tilegx_shutdown(struct uart_port *port)
 
 	if (port->irq > 0) {
 		free_irq(port->irq, port);
-		destroy_irq(port->irq);
+		irq_free_hwirq(port->irq);
 		port->irq = 0;
 	}
 
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 5f90ef2..dce27f3 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -418,14 +418,23 @@ static struct uart_ops ulite_ops = {
 #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
 static void ulite_console_wait_tx(struct uart_port *port)
 {
-	int i;
 	u8 val;
-
-	/* Spin waiting for TX fifo to have space available */
-	for (i = 0; i < 100000; i++) {
+	unsigned long timeout;
+
+	/*
+	 * Spin waiting for TX fifo to have space available.
+	 * When using the Microblaze Debug Module this can take up to 1s
+	 */
+	timeout = jiffies + msecs_to_jiffies(1000);
+	while (1) {
 		val = uart_in32(ULITE_STATUS, port);
 		if ((val & ULITE_STATUS_TXFULL) == 0)
 			break;
+		if (time_after(jiffies, timeout)) {
+			dev_warn(port->dev,
+				 "timeout waiting for TX buffer empty\n");
+			break;
+		}
 		cpu_relax();
 	}
 }
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index f619ad5..8809775 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1,7 +1,7 @@
 /*
- * Xilinx PS UART driver
+ * Cadence UART driver (found in Xilinx Zynq)
  *
- * 2011 - 2013 (C) Xilinx Inc.
+ * 2011 - 2014 (C) Xilinx Inc.
  *
  * This program is free software; you can redistribute it
  * and/or modify it under the terms of the GNU General Public
@@ -9,6 +9,9 @@
  * either version 2 of the License, or (at your option) any
  * later version.
  *
+ * This driver has originally been pushed by Xilinx using a Zynq-branding. This
+ * still shows in the naming of this file, the kconfig symbols and some symbols
+ * in the code.
  */
 
 #if defined(CONFIG_SERIAL_XILINX_PS_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
@@ -28,16 +31,16 @@
 #include <linux/of.h>
 #include <linux/module.h>
 
-#define XUARTPS_TTY_NAME	"ttyPS"
-#define XUARTPS_NAME		"xuartps"
-#define XUARTPS_MAJOR		0	/* use dynamic node allocation */
-#define XUARTPS_MINOR		0	/* works best with devtmpfs */
-#define XUARTPS_NR_PORTS	2
-#define XUARTPS_FIFO_SIZE	64	/* FIFO size */
-#define XUARTPS_REGISTER_SPACE	0xFFF
+#define CDNS_UART_TTY_NAME	"ttyPS"
+#define CDNS_UART_NAME		"xuartps"
+#define CDNS_UART_MAJOR		0	/* use dynamic node allocation */
+#define CDNS_UART_MINOR		0	/* works best with devtmpfs */
+#define CDNS_UART_NR_PORTS	2
+#define CDNS_UART_FIFO_SIZE	64	/* FIFO size */
+#define CDNS_UART_REGISTER_SPACE	0xFFF
 
-#define xuartps_readl(offset)		ioread32(port->membase + offset)
-#define xuartps_writel(val, offset)	iowrite32(val, port->membase + offset)
+#define cdns_uart_readl(offset)		ioread32(port->membase + offset)
+#define cdns_uart_writel(val, offset)	iowrite32(val, port->membase + offset)
 
 /* Rx Trigger level */
 static int rx_trigger_level = 56;
@@ -49,77 +52,62 @@ static int rx_timeout = 10;
 module_param(rx_timeout, uint, S_IRUGO);
 MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
 
-/********************************Register Map********************************/
-/** UART
- *
- * Register offsets for the UART.
- *
- */
-#define XUARTPS_CR_OFFSET	0x00  /* Control Register [8:0] */
-#define XUARTPS_MR_OFFSET	0x04  /* Mode Register [10:0] */
-#define XUARTPS_IER_OFFSET	0x08  /* Interrupt Enable [10:0] */
-#define XUARTPS_IDR_OFFSET	0x0C  /* Interrupt Disable [10:0] */
-#define XUARTPS_IMR_OFFSET	0x10  /* Interrupt Mask [10:0] */
-#define XUARTPS_ISR_OFFSET	0x14  /* Interrupt Status [10:0]*/
-#define XUARTPS_BAUDGEN_OFFSET	0x18  /* Baud Rate Generator [15:0] */
-#define XUARTPS_RXTOUT_OFFSET	0x1C  /* RX Timeout [7:0] */
-#define XUARTPS_RXWM_OFFSET	0x20  /* RX FIFO Trigger Level [5:0] */
-#define XUARTPS_MODEMCR_OFFSET	0x24  /* Modem Control [5:0] */
-#define XUARTPS_MODEMSR_OFFSET	0x28  /* Modem Status [8:0] */
-#define XUARTPS_SR_OFFSET	0x2C  /* Channel Status [11:0] */
-#define XUARTPS_FIFO_OFFSET	0x30  /* FIFO [15:0] or [7:0] */
-#define XUARTPS_BAUDDIV_OFFSET	0x34  /* Baud Rate Divider [7:0] */
-#define XUARTPS_FLOWDEL_OFFSET	0x38  /* Flow Delay [15:0] */
-#define XUARTPS_IRRX_PWIDTH_OFFSET 0x3C /* IR Minimum Received Pulse
-						Width [15:0] */
-#define XUARTPS_IRTX_PWIDTH_OFFSET 0x40 /* IR Transmitted pulse
-						Width [7:0] */
-#define XUARTPS_TXWM_OFFSET	0x44  /* TX FIFO Trigger Level [5:0] */
-
-/** Control Register
- *
- * The Control register (CR) controls the major functions of the device.
- *
- * Control Register Bit Definitions
- */
-#define XUARTPS_CR_STOPBRK	0x00000100  /* Stop TX break */
-#define XUARTPS_CR_STARTBRK	0x00000080  /* Set TX break */
-#define XUARTPS_CR_TX_DIS	0x00000020  /* TX disabled. */
-#define XUARTPS_CR_TX_EN	0x00000010  /* TX enabled */
-#define XUARTPS_CR_RX_DIS	0x00000008  /* RX disabled. */
-#define XUARTPS_CR_RX_EN	0x00000004  /* RX enabled */
-#define XUARTPS_CR_TXRST	0x00000002  /* TX logic reset */
-#define XUARTPS_CR_RXRST	0x00000001  /* RX logic reset */
-#define XUARTPS_CR_RST_TO	0x00000040  /* Restart Timeout Counter */
-
-/** Mode Register
- *
+/* Register offsets for the UART. */
+#define CDNS_UART_CR_OFFSET		0x00  /* Control Register */
+#define CDNS_UART_MR_OFFSET		0x04  /* Mode Register */
+#define CDNS_UART_IER_OFFSET		0x08  /* Interrupt Enable */
+#define CDNS_UART_IDR_OFFSET		0x0C  /* Interrupt Disable */
+#define CDNS_UART_IMR_OFFSET		0x10  /* Interrupt Mask */
+#define CDNS_UART_ISR_OFFSET		0x14  /* Interrupt Status */
+#define CDNS_UART_BAUDGEN_OFFSET	0x18  /* Baud Rate Generator */
+#define CDNS_UART_RXTOUT_OFFSET		0x1C  /* RX Timeout */
+#define CDNS_UART_RXWM_OFFSET		0x20  /* RX FIFO Trigger Level */
+#define CDNS_UART_MODEMCR_OFFSET	0x24  /* Modem Control */
+#define CDNS_UART_MODEMSR_OFFSET	0x28  /* Modem Status */
+#define CDNS_UART_SR_OFFSET		0x2C  /* Channel Status */
+#define CDNS_UART_FIFO_OFFSET		0x30  /* FIFO */
+#define CDNS_UART_BAUDDIV_OFFSET	0x34  /* Baud Rate Divider */
+#define CDNS_UART_FLOWDEL_OFFSET	0x38  /* Flow Delay */
+#define CDNS_UART_IRRX_PWIDTH_OFFSET	0x3C  /* IR Min Received Pulse Width */
+#define CDNS_UART_IRTX_PWIDTH_OFFSET	0x40  /* IR Transmitted pulse Width */
+#define CDNS_UART_TXWM_OFFSET		0x44  /* TX FIFO Trigger Level */
+
+/* Control Register Bit Definitions */
+#define CDNS_UART_CR_STOPBRK	0x00000100  /* Stop TX break */
+#define CDNS_UART_CR_STARTBRK	0x00000080  /* Set TX break */
+#define CDNS_UART_CR_TX_DIS	0x00000020  /* TX disabled. */
+#define CDNS_UART_CR_TX_EN	0x00000010  /* TX enabled */
+#define CDNS_UART_CR_RX_DIS	0x00000008  /* RX disabled. */
+#define CDNS_UART_CR_RX_EN	0x00000004  /* RX enabled */
+#define CDNS_UART_CR_TXRST	0x00000002  /* TX logic reset */
+#define CDNS_UART_CR_RXRST	0x00000001  /* RX logic reset */
+#define CDNS_UART_CR_RST_TO	0x00000040  /* Restart Timeout Counter */
+
+/*
+ * Mode Register:
  * The mode register (MR) defines the mode of transfer as well as the data
  * format. If this register is modified during transmission or reception,
  * data validity cannot be guaranteed.
- *
- * Mode Register Bit Definitions
- *
  */
-#define XUARTPS_MR_CLKSEL		0x00000001  /* Pre-scalar selection */
-#define XUARTPS_MR_CHMODE_L_LOOP	0x00000200  /* Local loop back mode */
-#define XUARTPS_MR_CHMODE_NORM		0x00000000  /* Normal mode */
+#define CDNS_UART_MR_CLKSEL		0x00000001  /* Pre-scalar selection */
+#define CDNS_UART_MR_CHMODE_L_LOOP	0x00000200  /* Local loop back mode */
+#define CDNS_UART_MR_CHMODE_NORM	0x00000000  /* Normal mode */
 
-#define XUARTPS_MR_STOPMODE_2_BIT	0x00000080  /* 2 stop bits */
-#define XUARTPS_MR_STOPMODE_1_BIT	0x00000000  /* 1 stop bit */
+#define CDNS_UART_MR_STOPMODE_2_BIT	0x00000080  /* 2 stop bits */
+#define CDNS_UART_MR_STOPMODE_1_BIT	0x00000000  /* 1 stop bit */
 
-#define XUARTPS_MR_PARITY_NONE		0x00000020  /* No parity mode */
-#define XUARTPS_MR_PARITY_MARK		0x00000018  /* Mark parity mode */
-#define XUARTPS_MR_PARITY_SPACE		0x00000010  /* Space parity mode */
-#define XUARTPS_MR_PARITY_ODD		0x00000008  /* Odd parity mode */
-#define XUARTPS_MR_PARITY_EVEN		0x00000000  /* Even parity mode */
+#define CDNS_UART_MR_PARITY_NONE	0x00000020  /* No parity mode */
+#define CDNS_UART_MR_PARITY_MARK	0x00000018  /* Mark parity mode */
+#define CDNS_UART_MR_PARITY_SPACE	0x00000010  /* Space parity mode */
+#define CDNS_UART_MR_PARITY_ODD		0x00000008  /* Odd parity mode */
+#define CDNS_UART_MR_PARITY_EVEN	0x00000000  /* Even parity mode */
 
-#define XUARTPS_MR_CHARLEN_6_BIT	0x00000006  /* 6 bits data */
-#define XUARTPS_MR_CHARLEN_7_BIT	0x00000004  /* 7 bits data */
-#define XUARTPS_MR_CHARLEN_8_BIT	0x00000000  /* 8 bits data */
+#define CDNS_UART_MR_CHARLEN_6_BIT	0x00000006  /* 6 bits data */
+#define CDNS_UART_MR_CHARLEN_7_BIT	0x00000004  /* 7 bits data */
+#define CDNS_UART_MR_CHARLEN_8_BIT	0x00000000  /* 8 bits data */
 
-/** Interrupt Registers
- *
+/*
+ * Interrupt Registers:
  * Interrupt control logic uses the interrupt enable register (IER) and the
  * interrupt disable register (IDR) to set the value of the bits in the
  * interrupt mask register (IMR). The IMR determines whether to pass an
@@ -127,65 +115,65 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
  * Writing a 1 to IER Enables an interrupt, writing a 1 to IDR disables an
  * interrupt. IMR and ISR are read only, and IER and IDR are write only.
  * Reading either IER or IDR returns 0x00.
- *
  * All four registers have the same bit definitions.
  */
-#define XUARTPS_IXR_TOUT	0x00000100 /* RX Timeout error interrupt */
-#define XUARTPS_IXR_PARITY	0x00000080 /* Parity error interrupt */
-#define XUARTPS_IXR_FRAMING	0x00000040 /* Framing error interrupt */
-#define XUARTPS_IXR_OVERRUN	0x00000020 /* Overrun error interrupt */
-#define XUARTPS_IXR_TXFULL	0x00000010 /* TX FIFO Full interrupt */
-#define XUARTPS_IXR_TXEMPTY	0x00000008 /* TX FIFO empty interrupt */
-#define XUARTPS_ISR_RXEMPTY	0x00000002 /* RX FIFO empty interrupt */
-#define XUARTPS_IXR_RXTRIG	0x00000001 /* RX FIFO trigger interrupt */
-#define XUARTPS_IXR_RXFULL	0x00000004 /* RX FIFO full interrupt. */
-#define XUARTPS_IXR_RXEMPTY	0x00000002 /* RX FIFO empty interrupt. */
-#define XUARTPS_IXR_MASK	0x00001FFF /* Valid bit mask */
+#define CDNS_UART_IXR_TOUT	0x00000100 /* RX Timeout error interrupt */
+#define CDNS_UART_IXR_PARITY	0x00000080 /* Parity error interrupt */
+#define CDNS_UART_IXR_FRAMING	0x00000040 /* Framing error interrupt */
+#define CDNS_UART_IXR_OVERRUN	0x00000020 /* Overrun error interrupt */
+#define CDNS_UART_IXR_TXFULL	0x00000010 /* TX FIFO Full interrupt */
+#define CDNS_UART_IXR_TXEMPTY	0x00000008 /* TX FIFO empty interrupt */
+#define CDNS_UART_ISR_RXEMPTY	0x00000002 /* RX FIFO empty interrupt */
+#define CDNS_UART_IXR_RXTRIG	0x00000001 /* RX FIFO trigger interrupt */
+#define CDNS_UART_IXR_RXFULL	0x00000004 /* RX FIFO full interrupt. */
+#define CDNS_UART_IXR_RXEMPTY	0x00000002 /* RX FIFO empty interrupt. */
+#define CDNS_UART_IXR_MASK	0x00001FFF /* Valid bit mask */
 
 /* Goes in read_status_mask for break detection as the HW doesn't do it*/
-#define XUARTPS_IXR_BRK		0x80000000
+#define CDNS_UART_IXR_BRK	0x80000000
 
-/** Channel Status Register
- *
+/*
+ * Channel Status Register:
  * The channel status register (CSR) is provided to enable the control logic
  * to monitor the status of bits in the channel interrupt status register,
  * even if these are masked out by the interrupt mask register.
  */
-#define XUARTPS_SR_RXEMPTY	0x00000002 /* RX FIFO empty */
-#define XUARTPS_SR_TXEMPTY	0x00000008 /* TX FIFO empty */
-#define XUARTPS_SR_TXFULL	0x00000010 /* TX FIFO full */
-#define XUARTPS_SR_RXTRIG	0x00000001 /* Rx Trigger */
+#define CDNS_UART_SR_RXEMPTY	0x00000002 /* RX FIFO empty */
+#define CDNS_UART_SR_TXEMPTY	0x00000008 /* TX FIFO empty */
+#define CDNS_UART_SR_TXFULL	0x00000010 /* TX FIFO full */
+#define CDNS_UART_SR_RXTRIG	0x00000001 /* Rx Trigger */
 
 /* baud dividers min/max values */
-#define XUARTPS_BDIV_MIN	4
-#define XUARTPS_BDIV_MAX	255
-#define XUARTPS_CD_MAX		65535
+#define CDNS_UART_BDIV_MIN	4
+#define CDNS_UART_BDIV_MAX	255
+#define CDNS_UART_CD_MAX	65535
 
 /**
- * struct xuartps - device data
- * @port		Pointer to the UART port
- * @refclk		Reference clock
- * @aperclk		APB clock
- * @baud		Current baud rate
- * @clk_rate_change_nb	Notifier block for clock changes
+ * struct cdns_uart - device data
+ * @port:		Pointer to the UART port
+ * @uartclk:		Reference clock
+ * @pclk:		APB clock
+ * @baud:		Current baud rate
+ * @clk_rate_change_nb:	Notifier block for clock changes
  */
-struct xuartps {
+struct cdns_uart {
 	struct uart_port	*port;
-	struct clk		*refclk;
-	struct clk		*aperclk;
+	struct clk		*uartclk;
+	struct clk		*pclk;
 	unsigned int		baud;
 	struct notifier_block	clk_rate_change_nb;
 };
-#define to_xuartps(_nb) container_of(_nb, struct xuartps, clk_rate_change_nb);
+#define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \
+		clk_rate_change_nb);
 
 /**
- * xuartps_isr - Interrupt handler
+ * cdns_uart_isr - Interrupt handler
  * @irq: Irq number
  * @dev_id: Id of the port
  *
- * Returns IRQHANDLED
- **/
-static irqreturn_t xuartps_isr(int irq, void *dev_id)
+ * Return: IRQHANDLED
+ */
+static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
 {
 	struct uart_port *port = (struct uart_port *)dev_id;
 	unsigned long flags;
@@ -198,43 +186,42 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 	/* Read the interrupt status register to determine which
 	 * interrupt(s) is/are active.
 	 */
-	isrstatus = xuartps_readl(XUARTPS_ISR_OFFSET);
+	isrstatus = cdns_uart_readl(CDNS_UART_ISR_OFFSET);
 
 	/*
 	 * There is no hardware break detection, so we interpret framing
 	 * error with all-zeros data as a break sequence. Most of the time,
 	 * there's another non-zero byte at the end of the sequence.
 	 */
-
-	if (isrstatus & XUARTPS_IXR_FRAMING) {
-		while (!(xuartps_readl(XUARTPS_SR_OFFSET) &
-					XUARTPS_SR_RXEMPTY)) {
-			if (!xuartps_readl(XUARTPS_FIFO_OFFSET)) {
-				port->read_status_mask |= XUARTPS_IXR_BRK;
-				isrstatus &= ~XUARTPS_IXR_FRAMING;
+	if (isrstatus & CDNS_UART_IXR_FRAMING) {
+		while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+					CDNS_UART_SR_RXEMPTY)) {
+			if (!cdns_uart_readl(CDNS_UART_FIFO_OFFSET)) {
+				port->read_status_mask |= CDNS_UART_IXR_BRK;
+				isrstatus &= ~CDNS_UART_IXR_FRAMING;
 			}
 		}
-		xuartps_writel(XUARTPS_IXR_FRAMING, XUARTPS_ISR_OFFSET);
+		cdns_uart_writel(CDNS_UART_IXR_FRAMING, CDNS_UART_ISR_OFFSET);
 	}
 
 	/* drop byte with parity error if IGNPAR specified */
-	if (isrstatus & port->ignore_status_mask & XUARTPS_IXR_PARITY)
-		isrstatus &= ~(XUARTPS_IXR_RXTRIG | XUARTPS_IXR_TOUT);
+	if (isrstatus & port->ignore_status_mask & CDNS_UART_IXR_PARITY)
+		isrstatus &= ~(CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_TOUT);
 
 	isrstatus &= port->read_status_mask;
 	isrstatus &= ~port->ignore_status_mask;
 
-	if ((isrstatus & XUARTPS_IXR_TOUT) ||
-		(isrstatus & XUARTPS_IXR_RXTRIG)) {
+	if ((isrstatus & CDNS_UART_IXR_TOUT) ||
+		(isrstatus & CDNS_UART_IXR_RXTRIG)) {
 		/* Receive Timeout Interrupt */
-		while ((xuartps_readl(XUARTPS_SR_OFFSET) &
-			XUARTPS_SR_RXEMPTY) != XUARTPS_SR_RXEMPTY) {
-			data = xuartps_readl(XUARTPS_FIFO_OFFSET);
+		while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+			CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
+			data = cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
 
 			/* Non-NULL byte after BREAK is garbage (99%) */
 			if (data && (port->read_status_mask &
-						XUARTPS_IXR_BRK)) {
-				port->read_status_mask &= ~XUARTPS_IXR_BRK;
+						CDNS_UART_IXR_BRK)) {
+				port->read_status_mask &= ~CDNS_UART_IXR_BRK;
 				port->icount.brk++;
 				if (uart_handle_break(port))
 					continue;
@@ -258,16 +245,17 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 
 			port->icount.rx++;
 
-			if (isrstatus & XUARTPS_IXR_PARITY) {
+			if (isrstatus & CDNS_UART_IXR_PARITY) {
 				port->icount.parity++;
 				status = TTY_PARITY;
-			} else if (isrstatus & XUARTPS_IXR_FRAMING) {
+			} else if (isrstatus & CDNS_UART_IXR_FRAMING) {
 				port->icount.frame++;
 				status = TTY_FRAME;
-			} else if (isrstatus & XUARTPS_IXR_OVERRUN)
+			} else if (isrstatus & CDNS_UART_IXR_OVERRUN) {
 				port->icount.overrun++;
+			}
 
-			uart_insert_char(port, isrstatus, XUARTPS_IXR_OVERRUN,
+			uart_insert_char(port, isrstatus, CDNS_UART_IXR_OVERRUN,
 					data, status);
 		}
 		spin_unlock(&port->lock);
@@ -276,10 +264,10 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 	}
 
 	/* Dispatch an appropriate handler */
-	if ((isrstatus & XUARTPS_IXR_TXEMPTY) == XUARTPS_IXR_TXEMPTY) {
+	if ((isrstatus & CDNS_UART_IXR_TXEMPTY) == CDNS_UART_IXR_TXEMPTY) {
 		if (uart_circ_empty(&port->state->xmit)) {
-			xuartps_writel(XUARTPS_IXR_TXEMPTY,
-						XUARTPS_IDR_OFFSET);
+			cdns_uart_writel(CDNS_UART_IXR_TXEMPTY,
+						CDNS_UART_IDR_OFFSET);
 		} else {
 			numbytes = port->fifosize;
 			/* Break if no more data available in the UART buffer */
@@ -287,12 +275,12 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 				if (uart_circ_empty(&port->state->xmit))
 					break;
 				/* Get the data from the UART circular buffer
-				 * and write it to the xuartps's TX_FIFO
+				 * and write it to the cdns_uart's TX_FIFO
 				 * register.
 				 */
-				xuartps_writel(
+				cdns_uart_writel(
 					port->state->xmit.buf[port->state->xmit.
-					tail], XUARTPS_FIFO_OFFSET);
+					tail], CDNS_UART_FIFO_OFFSET);
 
 				port->icount.tx++;
 
@@ -300,7 +288,7 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 				 * the buffer if it reaches limit.
 				 */
 				port->state->xmit.tail =
-					(port->state->xmit.tail + 1) & \
+					(port->state->xmit.tail + 1) &
 						(UART_XMIT_SIZE - 1);
 			}
 
@@ -310,7 +298,7 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 		}
 	}
 
-	xuartps_writel(isrstatus, XUARTPS_ISR_OFFSET);
+	cdns_uart_writel(isrstatus, CDNS_UART_ISR_OFFSET);
 
 	/* be sure to release the lock and tty before leaving */
 	spin_unlock_irqrestore(&port->lock, flags);
@@ -319,13 +307,13 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
 }
 
 /**
- * xuartps_calc_baud_divs - Calculate baud rate divisors
+ * cdns_uart_calc_baud_divs - Calculate baud rate divisors
  * @clk: UART module input clock
  * @baud: Desired baud rate
  * @rbdiv: BDIV value (return value)
  * @rcd: CD value (return value)
  * @div8: Value for clk_sel bit in mod (return value)
- * Returns baud rate, requested baud when possible, or actual baud when there
+ * Return: baud rate, requested baud when possible, or actual baud when there
  *	was too much error, zero if no valid divisors are found.
  *
  * Formula to obtain baud rate is
@@ -338,8 +326,8 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id)
  *			baud rate generate register
  *			baud rate clock divisor register
  */
-static unsigned int xuartps_calc_baud_divs(unsigned int clk, unsigned int baud,
-		u32 *rbdiv, u32 *rcd, int *div8)
+static unsigned int cdns_uart_calc_baud_divs(unsigned int clk,
+		unsigned int baud, u32 *rbdiv, u32 *rcd, int *div8)
 {
 	u32 cd, bdiv;
 	unsigned int calc_baud;
@@ -347,16 +335,16 @@ static unsigned int xuartps_calc_baud_divs(unsigned int clk, unsigned int baud,
 	unsigned int bauderror;
 	unsigned int besterror = ~0;
 
-	if (baud < clk / ((XUARTPS_BDIV_MAX + 1) * XUARTPS_CD_MAX)) {
+	if (baud < clk / ((CDNS_UART_BDIV_MAX + 1) * CDNS_UART_CD_MAX)) {
 		*div8 = 1;
 		clk /= 8;
 	} else {
 		*div8 = 0;
 	}
 
-	for (bdiv = XUARTPS_BDIV_MIN; bdiv <= XUARTPS_BDIV_MAX; bdiv++) {
+	for (bdiv = CDNS_UART_BDIV_MIN; bdiv <= CDNS_UART_BDIV_MAX; bdiv++) {
 		cd = DIV_ROUND_CLOSEST(clk, baud * (bdiv + 1));
-		if (cd < 1 || cd > XUARTPS_CD_MAX)
+		if (cd < 1 || cd > CDNS_UART_CD_MAX)
 			continue;
 
 		calc_baud = clk / (cd * (bdiv + 1));
@@ -381,47 +369,47 @@ static unsigned int xuartps_calc_baud_divs(unsigned int clk, unsigned int baud,
 }
 
 /**
- * xuartps_set_baud_rate - Calculate and set the baud rate
+ * cdns_uart_set_baud_rate - Calculate and set the baud rate
  * @port: Handle to the uart port structure
  * @baud: Baud rate to set
- * Returns baud rate, requested baud when possible, or actual baud when there
+ * Return: baud rate, requested baud when possible, or actual baud when there
  *	   was too much error, zero if no valid divisors are found.
  */
-static unsigned int xuartps_set_baud_rate(struct uart_port *port,
+static unsigned int cdns_uart_set_baud_rate(struct uart_port *port,
 		unsigned int baud)
 {
 	unsigned int calc_baud;
 	u32 cd = 0, bdiv = 0;
 	u32 mreg;
 	int div8;
-	struct xuartps *xuartps = port->private_data;
+	struct cdns_uart *cdns_uart = port->private_data;
 
-	calc_baud = xuartps_calc_baud_divs(port->uartclk, baud, &bdiv, &cd,
+	calc_baud = cdns_uart_calc_baud_divs(port->uartclk, baud, &bdiv, &cd,
 			&div8);
 
 	/* Write new divisors to hardware */
-	mreg = xuartps_readl(XUARTPS_MR_OFFSET);
+	mreg = cdns_uart_readl(CDNS_UART_MR_OFFSET);
 	if (div8)
-		mreg |= XUARTPS_MR_CLKSEL;
+		mreg |= CDNS_UART_MR_CLKSEL;
 	else
-		mreg &= ~XUARTPS_MR_CLKSEL;
-	xuartps_writel(mreg, XUARTPS_MR_OFFSET);
-	xuartps_writel(cd, XUARTPS_BAUDGEN_OFFSET);
-	xuartps_writel(bdiv, XUARTPS_BAUDDIV_OFFSET);
-	xuartps->baud = baud;
+		mreg &= ~CDNS_UART_MR_CLKSEL;
+	cdns_uart_writel(mreg, CDNS_UART_MR_OFFSET);
+	cdns_uart_writel(cd, CDNS_UART_BAUDGEN_OFFSET);
+	cdns_uart_writel(bdiv, CDNS_UART_BAUDDIV_OFFSET);
+	cdns_uart->baud = baud;
 
 	return calc_baud;
 }
 
 #ifdef CONFIG_COMMON_CLK
 /**
- * xuartps_clk_notitifer_cb - Clock notifier callback
+ * cdns_uart_clk_notitifer_cb - Clock notifier callback
  * @nb:		Notifier block
  * @event:	Notify event
  * @data:	Notifier data
- * Returns NOTIFY_OK on success, NOTIFY_BAD on error.
+ * Return:	NOTIFY_OK or NOTIFY_DONE on success, NOTIFY_BAD on error.
  */
-static int xuartps_clk_notifier_cb(struct notifier_block *nb,
+static int cdns_uart_clk_notifier_cb(struct notifier_block *nb,
 		unsigned long event, void *data)
 {
 	u32 ctrl_reg;
@@ -429,35 +417,36 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb,
 	int locked = 0;
 	struct clk_notifier_data *ndata = data;
 	unsigned long flags = 0;
-	struct xuartps *xuartps = to_xuartps(nb);
+	struct cdns_uart *cdns_uart = to_cdns_uart(nb);
 
-	port = xuartps->port;
+	port = cdns_uart->port;
 	if (port->suspended)
 		return NOTIFY_OK;
 
 	switch (event) {
 	case PRE_RATE_CHANGE:
 	{
-		u32 bdiv;
-		u32 cd;
+		u32 bdiv, cd;
 		int div8;
 
 		/*
 		 * Find out if current baud-rate can be achieved with new clock
 		 * frequency.
 		 */
-		if (!xuartps_calc_baud_divs(ndata->new_rate, xuartps->baud,
-					&bdiv, &cd, &div8))
+		if (!cdns_uart_calc_baud_divs(ndata->new_rate, cdns_uart->baud,
+					&bdiv, &cd, &div8)) {
+			dev_warn(port->dev, "clock rate change rejected\n");
 			return NOTIFY_BAD;
+		}
 
-		spin_lock_irqsave(&xuartps->port->lock, flags);
+		spin_lock_irqsave(&cdns_uart->port->lock, flags);
 
 		/* Disable the TX and RX to set baud rate */
-		xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
-				(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS),
-				XUARTPS_CR_OFFSET);
+		ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+		ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS;
+		cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
 
-		spin_unlock_irqrestore(&xuartps->port->lock, flags);
+		spin_unlock_irqrestore(&cdns_uart->port->lock, flags);
 
 		return NOTIFY_OK;
 	}
@@ -467,25 +456,25 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb,
 		 * frequency.
 		 */
 
-		spin_lock_irqsave(&xuartps->port->lock, flags);
+		spin_lock_irqsave(&cdns_uart->port->lock, flags);
 
 		locked = 1;
 		port->uartclk = ndata->new_rate;
 
-		xuartps->baud = xuartps_set_baud_rate(xuartps->port,
-				xuartps->baud);
+		cdns_uart->baud = cdns_uart_set_baud_rate(cdns_uart->port,
+				cdns_uart->baud);
 		/* fall through */
 	case ABORT_RATE_CHANGE:
 		if (!locked)
-			spin_lock_irqsave(&xuartps->port->lock, flags);
+			spin_lock_irqsave(&cdns_uart->port->lock, flags);
 
 		/* Set TX/RX Reset */
-		xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
-				(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST),
-				XUARTPS_CR_OFFSET);
+		ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+		ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
+		cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
 
-		while (xuartps_readl(XUARTPS_CR_OFFSET) &
-				(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST))
+		while (cdns_uart_readl(CDNS_UART_CR_OFFSET) &
+				(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
 			cpu_relax();
 
 		/*
@@ -493,14 +482,13 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb,
 		 * enable bit and RX enable bit to enable the transmitter and
 		 * receiver.
 		 */
-		xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
-		ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET);
-		xuartps_writel(
-			(ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS)) |
-			(XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN),
-			XUARTPS_CR_OFFSET);
+		cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
+		ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+		ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
+		ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
+		cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
 
-		spin_unlock_irqrestore(&xuartps->port->lock, flags);
+		spin_unlock_irqrestore(&cdns_uart->port->lock, flags);
 
 		return NOTIFY_OK;
 	default:
@@ -509,40 +497,36 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb,
 }
 #endif
 
-/*----------------------Uart Operations---------------------------*/
-
 /**
- * xuartps_start_tx -  Start transmitting bytes
+ * cdns_uart_start_tx -  Start transmitting bytes
  * @port: Handle to the uart port structure
- *
- **/
-static void xuartps_start_tx(struct uart_port *port)
+ */
+static void cdns_uart_start_tx(struct uart_port *port)
 {
 	unsigned int status, numbytes = port->fifosize;
 
 	if (uart_circ_empty(&port->state->xmit) || uart_tx_stopped(port))
 		return;
 
-	status = xuartps_readl(XUARTPS_CR_OFFSET);
+	status = cdns_uart_readl(CDNS_UART_CR_OFFSET);
 	/* Set the TX enable bit and clear the TX disable bit to enable the
 	 * transmitter.
 	 */
-	xuartps_writel((status & ~XUARTPS_CR_TX_DIS) | XUARTPS_CR_TX_EN,
-		XUARTPS_CR_OFFSET);
-
-	while (numbytes-- && ((xuartps_readl(XUARTPS_SR_OFFSET)
-		& XUARTPS_SR_TXFULL)) != XUARTPS_SR_TXFULL) {
+	cdns_uart_writel((status & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN,
+		CDNS_UART_CR_OFFSET);
 
+	while (numbytes-- && ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+				CDNS_UART_SR_TXFULL)) != CDNS_UART_SR_TXFULL) {
 		/* Break if no more data available in the UART buffer */
 		if (uart_circ_empty(&port->state->xmit))
 			break;
 
 		/* Get the data from the UART circular buffer and
-		 * write it to the xuartps's TX_FIFO register.
+		 * write it to the cdns_uart's TX_FIFO register.
 		 */
-		xuartps_writel(
+		cdns_uart_writel(
 			port->state->xmit.buf[port->state->xmit.tail],
-			XUARTPS_FIFO_OFFSET);
+			CDNS_UART_FIFO_OFFSET);
 		port->icount.tx++;
 
 		/* Adjust the tail of the UART buffer and wrap
@@ -551,94 +535,90 @@ static void xuartps_start_tx(struct uart_port *port)
 		port->state->xmit.tail = (port->state->xmit.tail + 1) &
 					(UART_XMIT_SIZE - 1);
 	}
-	xuartps_writel(XUARTPS_IXR_TXEMPTY, XUARTPS_ISR_OFFSET);
+	cdns_uart_writel(CDNS_UART_IXR_TXEMPTY, CDNS_UART_ISR_OFFSET);
 	/* Enable the TX Empty interrupt */
-	xuartps_writel(XUARTPS_IXR_TXEMPTY, XUARTPS_IER_OFFSET);
+	cdns_uart_writel(CDNS_UART_IXR_TXEMPTY, CDNS_UART_IER_OFFSET);
 
 	if (uart_circ_chars_pending(&port->state->xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
 }
 
 /**
- * xuartps_stop_tx - Stop TX
+ * cdns_uart_stop_tx - Stop TX
  * @port: Handle to the uart port structure
- *
- **/
-static void xuartps_stop_tx(struct uart_port *port)
+ */
+static void cdns_uart_stop_tx(struct uart_port *port)
 {
 	unsigned int regval;
 
-	regval = xuartps_readl(XUARTPS_CR_OFFSET);
-	regval |= XUARTPS_CR_TX_DIS;
+	regval = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+	regval |= CDNS_UART_CR_TX_DIS;
 	/* Disable the transmitter */
-	xuartps_writel(regval, XUARTPS_CR_OFFSET);
+	cdns_uart_writel(regval, CDNS_UART_CR_OFFSET);
 }
 
 /**
- * xuartps_stop_rx - Stop RX
+ * cdns_uart_stop_rx - Stop RX
  * @port: Handle to the uart port structure
- *
- **/
-static void xuartps_stop_rx(struct uart_port *port)
+ */
+static void cdns_uart_stop_rx(struct uart_port *port)
 {
 	unsigned int regval;
 
-	regval = xuartps_readl(XUARTPS_CR_OFFSET);
-	regval |= XUARTPS_CR_RX_DIS;
+	regval = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+	regval |= CDNS_UART_CR_RX_DIS;
 	/* Disable the receiver */
-	xuartps_writel(regval, XUARTPS_CR_OFFSET);
+	cdns_uart_writel(regval, CDNS_UART_CR_OFFSET);
 }
 
 /**
- * xuartps_tx_empty -  Check whether TX is empty
+ * cdns_uart_tx_empty -  Check whether TX is empty
  * @port: Handle to the uart port structure
  *
- * Returns TIOCSER_TEMT on success, 0 otherwise
- **/
-static unsigned int xuartps_tx_empty(struct uart_port *port)
+ * Return: TIOCSER_TEMT on success, 0 otherwise
+ */
+static unsigned int cdns_uart_tx_empty(struct uart_port *port)
 {
 	unsigned int status;
 
-	status = xuartps_readl(XUARTPS_ISR_OFFSET) & XUARTPS_IXR_TXEMPTY;
+	status = cdns_uart_readl(CDNS_UART_ISR_OFFSET) & CDNS_UART_IXR_TXEMPTY;
 	return status ? TIOCSER_TEMT : 0;
 }
 
 /**
- * xuartps_break_ctl - Based on the input ctl we have to start or stop
+ * cdns_uart_break_ctl - Based on the input ctl we have to start or stop
  *			transmitting char breaks
  * @port: Handle to the uart port structure
  * @ctl: Value based on which start or stop decision is taken
- *
- **/
-static void xuartps_break_ctl(struct uart_port *port, int ctl)
+ */
+static void cdns_uart_break_ctl(struct uart_port *port, int ctl)
 {
 	unsigned int status;
 	unsigned long flags;
 
 	spin_lock_irqsave(&port->lock, flags);
 
-	status = xuartps_readl(XUARTPS_CR_OFFSET);
+	status = cdns_uart_readl(CDNS_UART_CR_OFFSET);
 
 	if (ctl == -1)
-		xuartps_writel(XUARTPS_CR_STARTBRK | status,
-					XUARTPS_CR_OFFSET);
+		cdns_uart_writel(CDNS_UART_CR_STARTBRK | status,
+					CDNS_UART_CR_OFFSET);
 	else {
-		if ((status & XUARTPS_CR_STOPBRK) == 0)
-			xuartps_writel(XUARTPS_CR_STOPBRK | status,
-					 XUARTPS_CR_OFFSET);
+		if ((status & CDNS_UART_CR_STOPBRK) == 0)
+			cdns_uart_writel(CDNS_UART_CR_STOPBRK | status,
+					 CDNS_UART_CR_OFFSET);
 	}
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 /**
- * xuartps_set_termios - termios operations, handling data length, parity,
+ * cdns_uart_set_termios - termios operations, handling data length, parity,
  *				stop bits, flow control, baud rate
  * @port: Handle to the uart port structure
  * @termios: Handle to the input termios structure
  * @old: Values of the previously saved termios structure
- *
- **/
-static void xuartps_set_termios(struct uart_port *port,
+ */
+static void cdns_uart_set_termios(struct uart_port *port,
 				struct ktermios *termios, struct ktermios *old)
 {
 	unsigned int cval = 0;
@@ -649,81 +629,79 @@ static void xuartps_set_termios(struct uart_port *port,
 	spin_lock_irqsave(&port->lock, flags);
 
 	/* Empty the receive FIFO 1st before making changes */
-	while ((xuartps_readl(XUARTPS_SR_OFFSET) &
-		 XUARTPS_SR_RXEMPTY) != XUARTPS_SR_RXEMPTY) {
-		xuartps_readl(XUARTPS_FIFO_OFFSET);
+	while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+		 CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
+		cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
 	}
 
 	/* Disable the TX and RX to set baud rate */
-	xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
-			(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS),
-			XUARTPS_CR_OFFSET);
+	ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+	ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS;
+	cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
 
 	/*
 	 * Min baud rate = 6bps and Max Baud Rate is 10Mbps for 100Mhz clk
 	 * min and max baud should be calculated here based on port->uartclk.
 	 * this way we get a valid baud and can safely call set_baud()
 	 */
-	minbaud = port->uartclk / ((XUARTPS_BDIV_MAX + 1) * XUARTPS_CD_MAX * 8);
-	maxbaud = port->uartclk / (XUARTPS_BDIV_MIN + 1);
+	minbaud = port->uartclk /
+			((CDNS_UART_BDIV_MAX + 1) * CDNS_UART_CD_MAX * 8);
+	maxbaud = port->uartclk / (CDNS_UART_BDIV_MIN + 1);
 	baud = uart_get_baud_rate(port, termios, old, minbaud, maxbaud);
-	baud = xuartps_set_baud_rate(port, baud);
+	baud = cdns_uart_set_baud_rate(port, baud);
 	if (tty_termios_baud_rate(termios))
 		tty_termios_encode_baud_rate(termios, baud, baud);
 
-	/*
-	 * Update the per-port timeout.
-	 */
+	/* Update the per-port timeout. */
 	uart_update_timeout(port, termios->c_cflag, baud);
 
 	/* Set TX/RX Reset */
-	xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
-			(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST),
-			XUARTPS_CR_OFFSET);
+	ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+	ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
+	cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
 
-	ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET);
-
-	/* Clear the RX disable and TX disable bits and then set the TX enable
+	/*
+	 * Clear the RX disable and TX disable bits and then set the TX enable
 	 * bit and RX enable bit to enable the transmitter and receiver.
 	 */
-	xuartps_writel(
-		(ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS))
-			| (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN),
-			XUARTPS_CR_OFFSET);
+	ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+	ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
+	ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
+	cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
 
-	xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
+	cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
 
-	port->read_status_mask = XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_RXTRIG |
-			XUARTPS_IXR_OVERRUN | XUARTPS_IXR_TOUT;
+	port->read_status_mask = CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_RXTRIG |
+			CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_TOUT;
 	port->ignore_status_mask = 0;
 
 	if (termios->c_iflag & INPCK)
-		port->read_status_mask |= XUARTPS_IXR_PARITY |
-		XUARTPS_IXR_FRAMING;
+		port->read_status_mask |= CDNS_UART_IXR_PARITY |
+		CDNS_UART_IXR_FRAMING;
 
 	if (termios->c_iflag & IGNPAR)
-		port->ignore_status_mask |= XUARTPS_IXR_PARITY |
-			XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN;
+		port->ignore_status_mask |= CDNS_UART_IXR_PARITY |
+			CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN;
 
 	/* ignore all characters if CREAD is not set */
 	if ((termios->c_cflag & CREAD) == 0)
-		port->ignore_status_mask |= XUARTPS_IXR_RXTRIG |
-			XUARTPS_IXR_TOUT | XUARTPS_IXR_PARITY |
-			XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN;
+		port->ignore_status_mask |= CDNS_UART_IXR_RXTRIG |
+			CDNS_UART_IXR_TOUT | CDNS_UART_IXR_PARITY |
+			CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN;
 
-	mode_reg = xuartps_readl(XUARTPS_MR_OFFSET);
+	mode_reg = cdns_uart_readl(CDNS_UART_MR_OFFSET);
 
 	/* Handling Data Size */
 	switch (termios->c_cflag & CSIZE) {
 	case CS6:
-		cval |= XUARTPS_MR_CHARLEN_6_BIT;
+		cval |= CDNS_UART_MR_CHARLEN_6_BIT;
 		break;
 	case CS7:
-		cval |= XUARTPS_MR_CHARLEN_7_BIT;
+		cval |= CDNS_UART_MR_CHARLEN_7_BIT;
 		break;
 	default:
 	case CS8:
-		cval |= XUARTPS_MR_CHARLEN_8_BIT;
+		cval |= CDNS_UART_MR_CHARLEN_8_BIT;
 		termios->c_cflag &= ~CSIZE;
 		termios->c_cflag |= CS8;
 		break;
@@ -731,134 +709,135 @@ static void xuartps_set_termios(struct uart_port *port,
 
 	/* Handling Parity and Stop Bits length */
 	if (termios->c_cflag & CSTOPB)
-		cval |= XUARTPS_MR_STOPMODE_2_BIT; /* 2 STOP bits */
+		cval |= CDNS_UART_MR_STOPMODE_2_BIT; /* 2 STOP bits */
 	else
-		cval |= XUARTPS_MR_STOPMODE_1_BIT; /* 1 STOP bit */
+		cval |= CDNS_UART_MR_STOPMODE_1_BIT; /* 1 STOP bit */
 
 	if (termios->c_cflag & PARENB) {
 		/* Mark or Space parity */
 		if (termios->c_cflag & CMSPAR) {
 			if (termios->c_cflag & PARODD)
-				cval |= XUARTPS_MR_PARITY_MARK;
+				cval |= CDNS_UART_MR_PARITY_MARK;
 			else
-				cval |= XUARTPS_MR_PARITY_SPACE;
+				cval |= CDNS_UART_MR_PARITY_SPACE;
 		} else {
 			if (termios->c_cflag & PARODD)
-				cval |= XUARTPS_MR_PARITY_ODD;
+				cval |= CDNS_UART_MR_PARITY_ODD;
 			else
-				cval |= XUARTPS_MR_PARITY_EVEN;
+				cval |= CDNS_UART_MR_PARITY_EVEN;
 		}
 	} else {
-		cval |= XUARTPS_MR_PARITY_NONE;
+		cval |= CDNS_UART_MR_PARITY_NONE;
 	}
 	cval |= mode_reg & 1;
-	xuartps_writel(cval, XUARTPS_MR_OFFSET);
+	cdns_uart_writel(cval, CDNS_UART_MR_OFFSET);
 
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 /**
- * xuartps_startup - Called when an application opens a xuartps port
+ * cdns_uart_startup - Called when an application opens a cdns_uart port
  * @port: Handle to the uart port structure
  *
- * Returns 0 on success, negative error otherwise
- **/
-static int xuartps_startup(struct uart_port *port)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int cdns_uart_startup(struct uart_port *port)
 {
 	unsigned int retval = 0, status = 0;
 
-	retval = request_irq(port->irq, xuartps_isr, 0, XUARTPS_NAME,
+	retval = request_irq(port->irq, cdns_uart_isr, 0, CDNS_UART_NAME,
 								(void *)port);
 	if (retval)
 		return retval;
 
 	/* Disable the TX and RX */
-	xuartps_writel(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS,
-						XUARTPS_CR_OFFSET);
+	cdns_uart_writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,
+						CDNS_UART_CR_OFFSET);
 
 	/* Set the Control Register with TX/RX Enable, TX/RX Reset,
 	 * no break chars.
 	 */
-	xuartps_writel(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST,
-				XUARTPS_CR_OFFSET);
+	cdns_uart_writel(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST,
+				CDNS_UART_CR_OFFSET);
 
-	status = xuartps_readl(XUARTPS_CR_OFFSET);
+	status = cdns_uart_readl(CDNS_UART_CR_OFFSET);
 
 	/* Clear the RX disable and TX disable bits and then set the TX enable
 	 * bit and RX enable bit to enable the transmitter and receiver.
 	 */
-	xuartps_writel((status & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS))
-			| (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN |
-			XUARTPS_CR_STOPBRK), XUARTPS_CR_OFFSET);
+	cdns_uart_writel((status & ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS))
+			| (CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN |
+			CDNS_UART_CR_STOPBRK), CDNS_UART_CR_OFFSET);
 
 	/* Set the Mode Register with normal mode,8 data bits,1 stop bit,
 	 * no parity.
 	 */
-	xuartps_writel(XUARTPS_MR_CHMODE_NORM | XUARTPS_MR_STOPMODE_1_BIT
-		| XUARTPS_MR_PARITY_NONE | XUARTPS_MR_CHARLEN_8_BIT,
-		 XUARTPS_MR_OFFSET);
+	cdns_uart_writel(CDNS_UART_MR_CHMODE_NORM | CDNS_UART_MR_STOPMODE_1_BIT
+		| CDNS_UART_MR_PARITY_NONE | CDNS_UART_MR_CHARLEN_8_BIT,
+		 CDNS_UART_MR_OFFSET);
 
 	/*
 	 * Set the RX FIFO Trigger level to use most of the FIFO, but it
 	 * can be tuned with a module parameter
 	 */
-	xuartps_writel(rx_trigger_level, XUARTPS_RXWM_OFFSET);
+	cdns_uart_writel(rx_trigger_level, CDNS_UART_RXWM_OFFSET);
 
 	/*
 	 * Receive Timeout register is enabled but it
 	 * can be tuned with a module parameter
 	 */
-	xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
+	cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
 
 	/* Clear out any pending interrupts before enabling them */
-	xuartps_writel(xuartps_readl(XUARTPS_ISR_OFFSET), XUARTPS_ISR_OFFSET);
+	cdns_uart_writel(cdns_uart_readl(CDNS_UART_ISR_OFFSET),
+			CDNS_UART_ISR_OFFSET);
 
 	/* Set the Interrupt Registers with desired interrupts */
-	xuartps_writel(XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_PARITY |
-		XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN |
-		XUARTPS_IXR_RXTRIG | XUARTPS_IXR_TOUT, XUARTPS_IER_OFFSET);
+	cdns_uart_writel(CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_PARITY |
+		CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN |
+		CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_TOUT,
+		CDNS_UART_IER_OFFSET);
 
 	return retval;
 }
 
 /**
- * xuartps_shutdown - Called when an application closes a xuartps port
+ * cdns_uart_shutdown - Called when an application closes a cdns_uart port
  * @port: Handle to the uart port structure
- *
- **/
-static void xuartps_shutdown(struct uart_port *port)
+ */
+static void cdns_uart_shutdown(struct uart_port *port)
 {
 	int status;
 
 	/* Disable interrupts */
-	status = xuartps_readl(XUARTPS_IMR_OFFSET);
-	xuartps_writel(status, XUARTPS_IDR_OFFSET);
+	status = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+	cdns_uart_writel(status, CDNS_UART_IDR_OFFSET);
 
 	/* Disable the TX and RX */
-	xuartps_writel(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS,
-				 XUARTPS_CR_OFFSET);
+	cdns_uart_writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,
+				 CDNS_UART_CR_OFFSET);
 	free_irq(port->irq, port);
 }
 
 /**
- * xuartps_type - Set UART type to xuartps port
+ * cdns_uart_type - Set UART type to cdns_uart port
  * @port: Handle to the uart port structure
  *
- * Returns string on success, NULL otherwise
- **/
-static const char *xuartps_type(struct uart_port *port)
+ * Return: string on success, NULL otherwise
+ */
+static const char *cdns_uart_type(struct uart_port *port)
 {
-	return port->type == PORT_XUARTPS ? XUARTPS_NAME : NULL;
+	return port->type == PORT_XUARTPS ? CDNS_UART_NAME : NULL;
 }
 
 /**
- * xuartps_verify_port - Verify the port params
+ * cdns_uart_verify_port - Verify the port params
  * @port: Handle to the uart port structure
  * @ser: Handle to the structure whose members are compared
  *
- * Returns 0 if success otherwise -EINVAL
- **/
-static int xuartps_verify_port(struct uart_port *port,
+ * Return: 0 on success, negative errno otherwise.
+ */
+static int cdns_uart_verify_port(struct uart_port *port,
 					struct serial_struct *ser)
 {
 	if (ser->type != PORT_UNKNOWN && ser->type != PORT_XUARTPS)
@@ -875,187 +854,170 @@ static int xuartps_verify_port(struct uart_port *port,
 }
 
 /**
- * xuartps_request_port - Claim the memory region attached to xuartps port,
- *				called when the driver adds a xuartps port via
+ * cdns_uart_request_port - Claim the memory region attached to cdns_uart port,
+ *				called when the driver adds a cdns_uart port via
  *				uart_add_one_port()
  * @port: Handle to the uart port structure
  *
- * Returns 0, -ENOMEM if request fails
- **/
-static int xuartps_request_port(struct uart_port *port)
+ * Return: 0 on success, negative errno otherwise.
+ */
+static int cdns_uart_request_port(struct uart_port *port)
 {
-	if (!request_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE,
-					 XUARTPS_NAME)) {
+	if (!request_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE,
+					 CDNS_UART_NAME)) {
 		return -ENOMEM;
 	}
 
-	port->membase = ioremap(port->mapbase, XUARTPS_REGISTER_SPACE);
+	port->membase = ioremap(port->mapbase, CDNS_UART_REGISTER_SPACE);
 	if (!port->membase) {
 		dev_err(port->dev, "Unable to map registers\n");
-		release_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE);
+		release_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE);
 		return -ENOMEM;
 	}
 	return 0;
 }
 
 /**
- * xuartps_release_port - Release the memory region attached to a xuartps
- *				port, called when the driver removes a xuartps
- *				port via uart_remove_one_port().
+ * cdns_uart_release_port - Release UART port
  * @port: Handle to the uart port structure
  *
- **/
-static void xuartps_release_port(struct uart_port *port)
+ * Release the memory region attached to a cdns_uart port. Called when the
+ * driver removes a cdns_uart port via uart_remove_one_port().
+ */
+static void cdns_uart_release_port(struct uart_port *port)
 {
-	release_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE);
+	release_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE);
 	iounmap(port->membase);
 	port->membase = NULL;
 }
 
 /**
- * xuartps_config_port - Configure xuartps, called when the driver adds a
- *				xuartps port
+ * cdns_uart_config_port - Configure UART port
  * @port: Handle to the uart port structure
  * @flags: If any
- *
- **/
-static void xuartps_config_port(struct uart_port *port, int flags)
+ */
+static void cdns_uart_config_port(struct uart_port *port, int flags)
 {
-	if (flags & UART_CONFIG_TYPE && xuartps_request_port(port) == 0)
+	if (flags & UART_CONFIG_TYPE && cdns_uart_request_port(port) == 0)
 		port->type = PORT_XUARTPS;
 }
 
 /**
- * xuartps_get_mctrl - Get the modem control state
- *
+ * cdns_uart_get_mctrl - Get the modem control state
  * @port: Handle to the uart port structure
  *
- * Returns the modem control state
- *
- **/
-static unsigned int xuartps_get_mctrl(struct uart_port *port)
+ * Return: the modem control state
+ */
+static unsigned int cdns_uart_get_mctrl(struct uart_port *port)
 {
 	return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
 }
 
-static void xuartps_set_mctrl(struct uart_port *port, unsigned int mctrl)
+static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
 	/* N/A */
 }
 
-static void xuartps_enable_ms(struct uart_port *port)
+static void cdns_uart_enable_ms(struct uart_port *port)
 {
 	/* N/A */
 }
 
 #ifdef CONFIG_CONSOLE_POLL
-static int xuartps_poll_get_char(struct uart_port *port)
+static int cdns_uart_poll_get_char(struct uart_port *port)
 {
 	u32 imr;
 	int c;
 
 	/* Disable all interrupts */
-	imr = xuartps_readl(XUARTPS_IMR_OFFSET);
-	xuartps_writel(imr, XUARTPS_IDR_OFFSET);
+	imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+	cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET);
 
 	/* Check if FIFO is empty */
-	if (xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_RXEMPTY)
+	if (cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_RXEMPTY)
 		c = NO_POLL_CHAR;
 	else /* Read a character */
-		c = (unsigned char) xuartps_readl(XUARTPS_FIFO_OFFSET);
+		c = (unsigned char) cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
 
 	/* Enable interrupts */
-	xuartps_writel(imr, XUARTPS_IER_OFFSET);
+	cdns_uart_writel(imr, CDNS_UART_IER_OFFSET);
 
 	return c;
 }
 
-static void xuartps_poll_put_char(struct uart_port *port, unsigned char c)
+static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c)
 {
 	u32 imr;
 
 	/* Disable all interrupts */
-	imr = xuartps_readl(XUARTPS_IMR_OFFSET);
-	xuartps_writel(imr, XUARTPS_IDR_OFFSET);
+	imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+	cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET);
 
 	/* Wait until FIFO is empty */
-	while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY))
+	while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY))
 		cpu_relax();
 
 	/* Write a character */
-	xuartps_writel(c, XUARTPS_FIFO_OFFSET);
+	cdns_uart_writel(c, CDNS_UART_FIFO_OFFSET);
 
 	/* Wait until FIFO is empty */
-	while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY))
+	while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY))
 		cpu_relax();
 
 	/* Enable interrupts */
-	xuartps_writel(imr, XUARTPS_IER_OFFSET);
+	cdns_uart_writel(imr, CDNS_UART_IER_OFFSET);
 
 	return;
 }
 #endif
 
-/** The UART operations structure
- */
-static struct uart_ops xuartps_ops = {
-	.set_mctrl	= xuartps_set_mctrl,
-	.get_mctrl	= xuartps_get_mctrl,
-	.enable_ms	= xuartps_enable_ms,
-
-	.start_tx	= xuartps_start_tx,	/* Start transmitting */
-	.stop_tx	= xuartps_stop_tx,	/* Stop transmission */
-	.stop_rx	= xuartps_stop_rx,	/* Stop reception */
-	.tx_empty	= xuartps_tx_empty,	/* Transmitter busy? */
-	.break_ctl	= xuartps_break_ctl,	/* Start/stop
-						 * transmitting break
-						 */
-	.set_termios	= xuartps_set_termios,	/* Set termios */
-	.startup	= xuartps_startup,	/* App opens xuartps */
-	.shutdown	= xuartps_shutdown,	/* App closes xuartps */
-	.type		= xuartps_type,		/* Set UART type */
-	.verify_port	= xuartps_verify_port,	/* Verification of port
-						 * params
-						 */
-	.request_port	= xuartps_request_port,	/* Claim resources
-						 * associated with a
-						 * xuartps port
-						 */
-	.release_port	= xuartps_release_port,	/* Release resources
-						 * associated with a
-						 * xuartps port
-						 */
-	.config_port	= xuartps_config_port,	/* Configure when driver
-						 * adds a xuartps port
-						 */
+static struct uart_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,
+	.tx_empty	= cdns_uart_tx_empty,
+	.break_ctl	= cdns_uart_break_ctl,
+	.set_termios	= cdns_uart_set_termios,
+	.startup	= cdns_uart_startup,
+	.shutdown	= cdns_uart_shutdown,
+	.type		= cdns_uart_type,
+	.verify_port	= cdns_uart_verify_port,
+	.request_port	= cdns_uart_request_port,
+	.release_port	= cdns_uart_release_port,
+	.config_port	= cdns_uart_config_port,
 #ifdef CONFIG_CONSOLE_POLL
-	.poll_get_char	= xuartps_poll_get_char,
-	.poll_put_char	= xuartps_poll_put_char,
+	.poll_get_char	= cdns_uart_poll_get_char,
+	.poll_put_char	= cdns_uart_poll_put_char,
 #endif
 };
 
-static struct uart_port xuartps_port[2];
+static struct uart_port cdns_uart_port[2];
 
 /**
- * xuartps_get_port - Configure the port from the platform device resource
- *			info
+ * cdns_uart_get_port - Configure the port from platform device resource info
+ * @id: Port id
  *
- * Returns a pointer to a uart_port or NULL for failure
- **/
-static struct uart_port *xuartps_get_port(void)
+ * Return: a pointer to a uart_port or NULL for failure
+ */
+static struct uart_port *cdns_uart_get_port(int id)
 {
 	struct uart_port *port;
-	int id;
 
-	/* Find the next unused port */
-	for (id = 0; id < XUARTPS_NR_PORTS; id++)
-		if (xuartps_port[id].mapbase == 0)
-			break;
+	/* Try the given port id if failed use default method */
+	if (cdns_uart_port[id].mapbase != 0) {
+		/* Find the next unused port */
+		for (id = 0; id < CDNS_UART_NR_PORTS; id++)
+			if (cdns_uart_port[id].mapbase == 0)
+				break;
+	}
 
-	if (id >= XUARTPS_NR_PORTS)
+	if (id >= CDNS_UART_NR_PORTS)
 		return NULL;
 
-	port = &xuartps_port[id];
+	port = &cdns_uart_port[id];
 
 	/* At this point, we've got an empty uart_port struct, initialize it */
 	spin_lock_init(&port->lock);
@@ -1065,50 +1027,46 @@ static struct uart_port *xuartps_get_port(void)
 	port->type	= PORT_UNKNOWN;
 	port->iotype	= UPIO_MEM32;
 	port->flags	= UPF_BOOT_AUTOCONF;
-	port->ops	= &xuartps_ops;
-	port->fifosize	= XUARTPS_FIFO_SIZE;
+	port->ops	= &cdns_uart_ops;
+	port->fifosize	= CDNS_UART_FIFO_SIZE;
 	port->line	= id;
 	port->dev	= NULL;
 	return port;
 }
 
-/*-----------------------Console driver operations--------------------------*/
-
 #ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
 /**
- * xuartps_console_wait_tx - Wait for the TX to be full
+ * cdns_uart_console_wait_tx - Wait for the TX to be full
  * @port: Handle to the uart port structure
- *
- **/
-static void xuartps_console_wait_tx(struct uart_port *port)
+ */
+static void cdns_uart_console_wait_tx(struct uart_port *port)
 {
-	while ((xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY)
-				!= XUARTPS_SR_TXEMPTY)
+	while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY)
+				!= CDNS_UART_SR_TXEMPTY)
 		barrier();
 }
 
 /**
- * xuartps_console_putchar - write the character to the FIFO buffer
+ * cdns_uart_console_putchar - write the character to the FIFO buffer
  * @port: Handle to the uart port structure
  * @ch: Character to be written
- *
- **/
-static void xuartps_console_putchar(struct uart_port *port, int ch)
+ */
+static void cdns_uart_console_putchar(struct uart_port *port, int ch)
 {
-	xuartps_console_wait_tx(port);
-	xuartps_writel(ch, XUARTPS_FIFO_OFFSET);
+	cdns_uart_console_wait_tx(port);
+	cdns_uart_writel(ch, CDNS_UART_FIFO_OFFSET);
 }
 
 /**
- * xuartps_console_write - perform write operation
- * @port: Handle to the uart port structure
+ * cdns_uart_console_write - perform write operation
+ * @co: Console handle
  * @s: Pointer to character array
  * @count: No of characters
- **/
-static void xuartps_console_write(struct console *co, const char *s,
+ */
+static void cdns_uart_console_write(struct console *co, const char *s,
 				unsigned int count)
 {
-	struct uart_port *port = &xuartps_port[co->index];
+	struct uart_port *port = &cdns_uart_port[co->index];
 	unsigned long flags;
 	unsigned int imr, ctrl;
 	int locked = 1;
@@ -1119,49 +1077,45 @@ static void xuartps_console_write(struct console *co, const char *s,
 		spin_lock_irqsave(&port->lock, flags);
 
 	/* save and disable interrupt */
-	imr = xuartps_readl(XUARTPS_IMR_OFFSET);
-	xuartps_writel(imr, XUARTPS_IDR_OFFSET);
+	imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+	cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET);
 
 	/*
 	 * Make sure that the tx part is enabled. Set the TX enable bit and
 	 * clear the TX disable bit to enable the transmitter.
 	 */
-	ctrl = xuartps_readl(XUARTPS_CR_OFFSET);
-	xuartps_writel((ctrl & ~XUARTPS_CR_TX_DIS) | XUARTPS_CR_TX_EN,
-		XUARTPS_CR_OFFSET);
+	ctrl = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+	cdns_uart_writel((ctrl & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN,
+		CDNS_UART_CR_OFFSET);
 
-	uart_console_write(port, s, count, xuartps_console_putchar);
-	xuartps_console_wait_tx(port);
+	uart_console_write(port, s, count, cdns_uart_console_putchar);
+	cdns_uart_console_wait_tx(port);
 
-	xuartps_writel(ctrl, XUARTPS_CR_OFFSET);
+	cdns_uart_writel(ctrl, CDNS_UART_CR_OFFSET);
 
-	/* restore interrupt state, it seems like there may be a h/w bug
-	 * in that the interrupt enable register should not need to be
-	 * written based on the data sheet
-	 */
-	xuartps_writel(~imr, XUARTPS_IDR_OFFSET);
-	xuartps_writel(imr, XUARTPS_IER_OFFSET);
+	/* restore interrupt state */
+	cdns_uart_writel(imr, CDNS_UART_IER_OFFSET);
 
 	if (locked)
 		spin_unlock_irqrestore(&port->lock, flags);
 }
 
 /**
- * xuartps_console_setup - Initialize the uart to default config
+ * cdns_uart_console_setup - Initialize the uart to default config
  * @co: Console handle
  * @options: Initial settings of uart
  *
- * Returns 0, -ENODEV if no device
- **/
-static int __init xuartps_console_setup(struct console *co, char *options)
+ * Return: 0 on success, negative errno otherwise.
+ */
+static int __init cdns_uart_console_setup(struct console *co, char *options)
 {
-	struct uart_port *port = &xuartps_port[co->index];
+	struct uart_port *port = &cdns_uart_port[co->index];
 	int baud = 9600;
 	int bits = 8;
 	int parity = 'n';
 	int flow = 'n';
 
-	if (co->index < 0 || co->index >= XUARTPS_NR_PORTS)
+	if (co->index < 0 || co->index >= CDNS_UART_NR_PORTS)
 		return -EINVAL;
 
 	if (!port->mapbase) {
@@ -1175,55 +1129,53 @@ static int __init xuartps_console_setup(struct console *co, char *options)
 	return uart_set_options(port, co, baud, parity, bits, flow);
 }
 
-static struct uart_driver xuartps_uart_driver;
+static struct uart_driver cdns_uart_uart_driver;
 
-static struct console xuartps_console = {
-	.name	= XUARTPS_TTY_NAME,
-	.write	= xuartps_console_write,
+static struct console cdns_uart_console = {
+	.name	= CDNS_UART_TTY_NAME,
+	.write	= cdns_uart_console_write,
 	.device	= uart_console_device,
-	.setup	= xuartps_console_setup,
+	.setup	= cdns_uart_console_setup,
 	.flags	= CON_PRINTBUFFER,
 	.index	= -1, /* Specified on the cmdline (e.g. console=ttyPS ) */
-	.data	= &xuartps_uart_driver,
+	.data	= &cdns_uart_uart_driver,
 };
 
 /**
- * xuartps_console_init - Initialization call
+ * cdns_uart_console_init - Initialization call
  *
- * Returns 0 on success, negative error otherwise
- **/
-static int __init xuartps_console_init(void)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int __init cdns_uart_console_init(void)
 {
-	register_console(&xuartps_console);
+	register_console(&cdns_uart_console);
 	return 0;
 }
 
-console_initcall(xuartps_console_init);
+console_initcall(cdns_uart_console_init);
 
 #endif /* CONFIG_SERIAL_XILINX_PS_UART_CONSOLE */
 
-/** Structure Definitions
- */
-static struct uart_driver xuartps_uart_driver = {
-	.owner		= THIS_MODULE,		/* Owner */
-	.driver_name	= XUARTPS_NAME,		/* Driver name */
-	.dev_name	= XUARTPS_TTY_NAME,	/* Node name */
-	.major		= XUARTPS_MAJOR,	/* Major number */
-	.minor		= XUARTPS_MINOR,	/* Minor number */
-	.nr		= XUARTPS_NR_PORTS,	/* Number of UART ports */
+static struct uart_driver cdns_uart_uart_driver = {
+	.owner		= THIS_MODULE,
+	.driver_name	= CDNS_UART_NAME,
+	.dev_name	= CDNS_UART_TTY_NAME,
+	.major		= CDNS_UART_MAJOR,
+	.minor		= CDNS_UART_MINOR,
+	.nr		= CDNS_UART_NR_PORTS,
 #ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
-	.cons		= &xuartps_console,	/* Console */
+	.cons		= &cdns_uart_console,
 #endif
 };
 
 #ifdef CONFIG_PM_SLEEP
 /**
- * xuartps_suspend - suspend event
+ * cdns_uart_suspend - suspend event
  * @device: Pointer to the device structure
  *
- * Returns 0
+ * Return: 0
  */
-static int xuartps_suspend(struct device *device)
+static int cdns_uart_suspend(struct device *device)
 {
 	struct uart_port *port = dev_get_drvdata(device);
 	struct tty_struct *tty;
@@ -1242,23 +1194,24 @@ static int xuartps_suspend(struct device *device)
 	 * Call the API provided in serial_core.c file which handles
 	 * the suspend.
 	 */
-	uart_suspend_port(&xuartps_uart_driver, port);
+	uart_suspend_port(&cdns_uart_uart_driver, port);
 	if (console_suspend_enabled && !may_wake) {
-		struct xuartps *xuartps = port->private_data;
+		struct cdns_uart *cdns_uart = port->private_data;
 
-		clk_disable(xuartps->refclk);
-		clk_disable(xuartps->aperclk);
+		clk_disable(cdns_uart->uartclk);
+		clk_disable(cdns_uart->pclk);
 	} else {
 		unsigned long flags = 0;
 
 		spin_lock_irqsave(&port->lock, flags);
 		/* Empty the receive FIFO 1st before making changes */
-		while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_RXEMPTY))
-			xuartps_readl(XUARTPS_FIFO_OFFSET);
+		while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+					CDNS_UART_SR_RXEMPTY))
+			cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
 		/* set RX trigger level to 1 */
-		xuartps_writel(1, XUARTPS_RXWM_OFFSET);
+		cdns_uart_writel(1, CDNS_UART_RXWM_OFFSET);
 		/* disable RX timeout interrups */
-		xuartps_writel(XUARTPS_IXR_TOUT, XUARTPS_IDR_OFFSET);
+		cdns_uart_writel(CDNS_UART_IXR_TOUT, CDNS_UART_IDR_OFFSET);
 		spin_unlock_irqrestore(&port->lock, flags);
 	}
 
@@ -1266,12 +1219,12 @@ static int xuartps_suspend(struct device *device)
 }
 
 /**
- * xuartps_resume - Resume after a previous suspend
+ * cdns_uart_resume - Resume after a previous suspend
  * @device: Pointer to the device structure
  *
- * Returns 0
+ * Return: 0
  */
-static int xuartps_resume(struct device *device)
+static int cdns_uart_resume(struct device *device)
 {
 	struct uart_port *port = dev_get_drvdata(device);
 	unsigned long flags = 0;
@@ -1289,87 +1242,95 @@ static int xuartps_resume(struct device *device)
 	}
 
 	if (console_suspend_enabled && !may_wake) {
-		struct xuartps *xuartps = port->private_data;
+		struct cdns_uart *cdns_uart = port->private_data;
 
-		clk_enable(xuartps->aperclk);
-		clk_enable(xuartps->refclk);
+		clk_enable(cdns_uart->pclk);
+		clk_enable(cdns_uart->uartclk);
 
 		spin_lock_irqsave(&port->lock, flags);
 
 		/* Set TX/RX Reset */
-		xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
-				(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST),
-				XUARTPS_CR_OFFSET);
-		while (xuartps_readl(XUARTPS_CR_OFFSET) &
-				(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST))
+		ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+		ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
+		cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
+		while (cdns_uart_readl(CDNS_UART_CR_OFFSET) &
+				(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
 			cpu_relax();
 
 		/* restore rx timeout value */
-		xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
+		cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
 		/* Enable Tx/Rx */
-		ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET);
-		xuartps_writel(
-			(ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS)) |
-			(XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN),
-			XUARTPS_CR_OFFSET);
+		ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+		ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
+		ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
+		cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
 
 		spin_unlock_irqrestore(&port->lock, flags);
 	} else {
 		spin_lock_irqsave(&port->lock, flags);
 		/* restore original rx trigger level */
-		xuartps_writel(rx_trigger_level, XUARTPS_RXWM_OFFSET);
+		cdns_uart_writel(rx_trigger_level, CDNS_UART_RXWM_OFFSET);
 		/* enable RX timeout interrupt */
-		xuartps_writel(XUARTPS_IXR_TOUT, XUARTPS_IER_OFFSET);
+		cdns_uart_writel(CDNS_UART_IXR_TOUT, CDNS_UART_IER_OFFSET);
 		spin_unlock_irqrestore(&port->lock, flags);
 	}
 
-	return uart_resume_port(&xuartps_uart_driver, port);
+	return uart_resume_port(&cdns_uart_uart_driver, port);
 }
 #endif /* ! CONFIG_PM_SLEEP */
 
-static SIMPLE_DEV_PM_OPS(xuartps_dev_pm_ops, xuartps_suspend, xuartps_resume);
+static SIMPLE_DEV_PM_OPS(cdns_uart_dev_pm_ops, cdns_uart_suspend,
+		cdns_uart_resume);
 
-/* ---------------------------------------------------------------------
- * Platform bus binding
- */
 /**
- * xuartps_probe - Platform driver probe
+ * cdns_uart_probe - Platform driver probe
  * @pdev: Pointer to the platform device structure
  *
- * Returns 0 on success, negative error otherwise
- **/
-static int xuartps_probe(struct platform_device *pdev)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int cdns_uart_probe(struct platform_device *pdev)
 {
-	int rc;
+	int rc, id;
 	struct uart_port *port;
 	struct resource *res, *res2;
-	struct xuartps *xuartps_data;
+	struct cdns_uart *cdns_uart_data;
 
-	xuartps_data = devm_kzalloc(&pdev->dev, sizeof(*xuartps_data),
+	cdns_uart_data = devm_kzalloc(&pdev->dev, sizeof(*cdns_uart_data),
 			GFP_KERNEL);
-	if (!xuartps_data)
+	if (!cdns_uart_data)
 		return -ENOMEM;
 
-	xuartps_data->aperclk = devm_clk_get(&pdev->dev, "aper_clk");
-	if (IS_ERR(xuartps_data->aperclk)) {
-		dev_err(&pdev->dev, "aper_clk clock not found.\n");
-		return PTR_ERR(xuartps_data->aperclk);
+	cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "pclk");
+	if (IS_ERR(cdns_uart_data->pclk)) {
+		cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "aper_clk");
+		if (!IS_ERR(cdns_uart_data->pclk))
+			dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
 	}
-	xuartps_data->refclk = devm_clk_get(&pdev->dev, "ref_clk");
-	if (IS_ERR(xuartps_data->refclk)) {
-		dev_err(&pdev->dev, "ref_clk clock not found.\n");
-		return PTR_ERR(xuartps_data->refclk);
+	if (IS_ERR(cdns_uart_data->pclk)) {
+		dev_err(&pdev->dev, "pclk clock not found.\n");
+		return PTR_ERR(cdns_uart_data->pclk);
 	}
 
-	rc = clk_prepare_enable(xuartps_data->aperclk);
+	cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
+	if (IS_ERR(cdns_uart_data->uartclk)) {
+		cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "ref_clk");
+		if (!IS_ERR(cdns_uart_data->uartclk))
+			dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
+	}
+	if (IS_ERR(cdns_uart_data->uartclk)) {
+		dev_err(&pdev->dev, "uart_clk clock not found.\n");
+		return PTR_ERR(cdns_uart_data->uartclk);
+	}
+
+	rc = clk_prepare_enable(cdns_uart_data->pclk);
 	if (rc) {
-		dev_err(&pdev->dev, "Unable to enable APER clock.\n");
+		dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
 		return rc;
 	}
-	rc = clk_prepare_enable(xuartps_data->refclk);
+	rc = clk_prepare_enable(cdns_uart_data->uartclk);
 	if (rc) {
 		dev_err(&pdev->dev, "Unable to enable device clock.\n");
-		goto err_out_clk_dis_aper;
+		goto err_out_clk_dis_pclk;
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1385,15 +1346,19 @@ static int xuartps_probe(struct platform_device *pdev)
 	}
 
 #ifdef CONFIG_COMMON_CLK
-	xuartps_data->clk_rate_change_nb.notifier_call =
-			xuartps_clk_notifier_cb;
-	if (clk_notifier_register(xuartps_data->refclk,
-				&xuartps_data->clk_rate_change_nb))
+	cdns_uart_data->clk_rate_change_nb.notifier_call =
+			cdns_uart_clk_notifier_cb;
+	if (clk_notifier_register(cdns_uart_data->uartclk,
+				&cdns_uart_data->clk_rate_change_nb))
 		dev_warn(&pdev->dev, "Unable to register clock notifier.\n");
 #endif
+	/* Look for a serialN alias */
+	id = of_alias_get_id(pdev->dev.of_node, "serial");
+	if (id < 0)
+		id = 0;
 
 	/* Initialize the port structure */
-	port = xuartps_get_port();
+	port = cdns_uart_get_port(id);
 
 	if (!port) {
 		dev_err(&pdev->dev, "Cannot get uart_port structure\n");
@@ -1407,11 +1372,11 @@ static int xuartps_probe(struct platform_device *pdev)
 		port->mapbase = res->start;
 		port->irq = res2->start;
 		port->dev = &pdev->dev;
-		port->uartclk = clk_get_rate(xuartps_data->refclk);
-		port->private_data = xuartps_data;
-		xuartps_data->port = port;
+		port->uartclk = clk_get_rate(cdns_uart_data->uartclk);
+		port->private_data = cdns_uart_data;
+		cdns_uart_data->port = port;
 		platform_set_drvdata(pdev, port);
-		rc = uart_add_one_port(&xuartps_uart_driver, port);
+		rc = uart_add_one_port(&cdns_uart_uart_driver, port);
 		if (rc) {
 			dev_err(&pdev->dev,
 				"uart_add_one_port() failed; err=%i\n", rc);
@@ -1422,103 +1387,89 @@ static int xuartps_probe(struct platform_device *pdev)
 
 err_out_notif_unreg:
 #ifdef CONFIG_COMMON_CLK
-	clk_notifier_unregister(xuartps_data->refclk,
-			&xuartps_data->clk_rate_change_nb);
+	clk_notifier_unregister(cdns_uart_data->uartclk,
+			&cdns_uart_data->clk_rate_change_nb);
 #endif
 err_out_clk_disable:
-	clk_disable_unprepare(xuartps_data->refclk);
-err_out_clk_dis_aper:
-	clk_disable_unprepare(xuartps_data->aperclk);
+	clk_disable_unprepare(cdns_uart_data->uartclk);
+err_out_clk_dis_pclk:
+	clk_disable_unprepare(cdns_uart_data->pclk);
 
 	return rc;
 }
 
 /**
- * xuartps_remove - called when the platform driver is unregistered
+ * cdns_uart_remove - called when the platform driver is unregistered
  * @pdev: Pointer to the platform device structure
  *
- * Returns 0 on success, negative error otherwise
- **/
-static int xuartps_remove(struct platform_device *pdev)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int cdns_uart_remove(struct platform_device *pdev)
 {
 	struct uart_port *port = platform_get_drvdata(pdev);
-	struct xuartps *xuartps_data = port->private_data;
+	struct cdns_uart *cdns_uart_data = port->private_data;
 	int rc;
 
-	/* Remove the xuartps port from the serial core */
+	/* Remove the cdns_uart port from the serial core */
 #ifdef CONFIG_COMMON_CLK
-	clk_notifier_unregister(xuartps_data->refclk,
-			&xuartps_data->clk_rate_change_nb);
+	clk_notifier_unregister(cdns_uart_data->uartclk,
+			&cdns_uart_data->clk_rate_change_nb);
 #endif
-	rc = uart_remove_one_port(&xuartps_uart_driver, port);
+	rc = uart_remove_one_port(&cdns_uart_uart_driver, port);
 	port->mapbase = 0;
-	clk_disable_unprepare(xuartps_data->refclk);
-	clk_disable_unprepare(xuartps_data->aperclk);
+	clk_disable_unprepare(cdns_uart_data->uartclk);
+	clk_disable_unprepare(cdns_uart_data->pclk);
 	return rc;
 }
 
 /* Match table for of_platform binding */
-static struct of_device_id xuartps_of_match[] = {
+static struct of_device_id cdns_uart_of_match[] = {
 	{ .compatible = "xlnx,xuartps", },
+	{ .compatible = "cdns,uart-r1p8", },
 	{}
 };
-MODULE_DEVICE_TABLE(of, xuartps_of_match);
+MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
 
-static struct platform_driver xuartps_platform_driver = {
-	.probe   = xuartps_probe,		/* Probe method */
-	.remove  = xuartps_remove,		/* Detach method */
+static struct platform_driver cdns_uart_platform_driver = {
+	.probe   = cdns_uart_probe,
+	.remove  = cdns_uart_remove,
 	.driver  = {
 		.owner = THIS_MODULE,
-		.name = XUARTPS_NAME,		/* Driver name */
-		.of_match_table = xuartps_of_match,
-		.pm = &xuartps_dev_pm_ops,
+		.name = CDNS_UART_NAME,
+		.of_match_table = cdns_uart_of_match,
+		.pm = &cdns_uart_dev_pm_ops,
 		},
 };
 
-/* ---------------------------------------------------------------------
- * Module Init and Exit
- */
-/**
- * xuartps_init - Initial driver registration call
- *
- * Returns whether the registration was successful or not
- **/
-static int __init xuartps_init(void)
+static int __init cdns_uart_init(void)
 {
 	int retval = 0;
 
-	/* Register the xuartps driver with the serial core */
-	retval = uart_register_driver(&xuartps_uart_driver);
+	/* Register the cdns_uart driver with the serial core */
+	retval = uart_register_driver(&cdns_uart_uart_driver);
 	if (retval)
 		return retval;
 
 	/* Register the platform driver */
-	retval = platform_driver_register(&xuartps_platform_driver);
+	retval = platform_driver_register(&cdns_uart_platform_driver);
 	if (retval)
-		uart_unregister_driver(&xuartps_uart_driver);
+		uart_unregister_driver(&cdns_uart_uart_driver);
 
 	return retval;
 }
 
-/**
- * xuartps_exit - Driver unregistration call
- **/
-static void __exit xuartps_exit(void)
+static void __exit cdns_uart_exit(void)
 {
-	/* The order of unregistration is important. Unregister the
-	 * UART driver before the platform driver crashes the system.
-	 */
-
 	/* Unregister the platform driver */
-	platform_driver_unregister(&xuartps_platform_driver);
+	platform_driver_unregister(&cdns_uart_platform_driver);
 
-	/* Unregister the xuartps driver */
-	uart_unregister_driver(&xuartps_uart_driver);
+	/* Unregister the cdns_uart driver */
+	uart_unregister_driver(&cdns_uart_uart_driver);
 }
 
-module_init(xuartps_init);
-module_exit(xuartps_exit);
+module_init(cdns_uart_init);
+module_exit(cdns_uart_exit);
 
-MODULE_DESCRIPTION("Driver for PS UART");
+MODULE_DESCRIPTION("Driver for Cadence UART");
 MODULE_AUTHOR("Xilinx Inc.");
 MODULE_LICENSE("GPL");
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index ce396ec..454b658 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -46,6 +46,7 @@
 #include <linux/jiffies.h>
 #include <linux/syscalls.h>
 #include <linux/of.h>
+#include <linux/rcupdate.h>
 
 #include <asm/ptrace.h>
 #include <asm/irq_regs.h>
@@ -88,7 +89,7 @@ static void sysrq_handle_loglevel(int key)
 	int i;
 
 	i = key - '0';
-	console_loglevel = 7;
+	console_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
 	printk("Loglevel set to %d\n", i);
 	console_loglevel = i;
 }
@@ -343,7 +344,7 @@ static void send_sig_all(int sig)
 static void sysrq_handle_term(int key)
 {
 	send_sig_all(SIGTERM);
-	console_loglevel = 8;
+	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
 }
 static struct sysrq_key_op sysrq_term_op = {
 	.handler	= sysrq_handle_term,
@@ -387,7 +388,7 @@ static struct sysrq_key_op sysrq_thaw_op = {
 static void sysrq_handle_kill(int key)
 {
 	send_sig_all(SIGKILL);
-	console_loglevel = 8;
+	console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
 }
 static struct sysrq_key_op sysrq_kill_op = {
 	.handler	= sysrq_handle_kill,
@@ -510,9 +511,9 @@ void __handle_sysrq(int key, bool check_mask)
 	struct sysrq_key_op *op_p;
 	int orig_log_level;
 	int i;
-	unsigned long flags;
 
-	spin_lock_irqsave(&sysrq_key_table_lock, flags);
+	rcu_sysrq_start();
+	rcu_read_lock();
 	/*
 	 * Raise the apparent loglevel to maximum so that the sysrq header
 	 * is shown to provide the user with positive feedback.  We do not
@@ -520,7 +521,7 @@ void __handle_sysrq(int key, bool check_mask)
 	 * routing in the consumers of /proc/kmsg.
 	 */
 	orig_log_level = console_loglevel;
-	console_loglevel = 7;
+	console_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
 	printk(KERN_INFO "SysRq : ");
 
         op_p = __sysrq_get_key_op(key);
@@ -554,7 +555,8 @@ void __handle_sysrq(int key, bool check_mask)
 		printk("\n");
 		console_loglevel = orig_log_level;
 	}
-	spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
+	rcu_read_unlock();
+	rcu_sysrq_end();
 }
 
 void handle_sysrq(int key)
@@ -1043,16 +1045,23 @@ static int __sysrq_swap_key_ops(int key, struct sysrq_key_op *insert_op_p,
                                 struct sysrq_key_op *remove_op_p)
 {
 	int retval;
-	unsigned long flags;
 
-	spin_lock_irqsave(&sysrq_key_table_lock, flags);
+	spin_lock(&sysrq_key_table_lock);
 	if (__sysrq_get_key_op(key) == remove_op_p) {
 		__sysrq_put_key_op(key, insert_op_p);
 		retval = 0;
 	} else {
 		retval = -1;
 	}
-	spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
+	spin_unlock(&sysrq_key_table_lock);
+
+	/*
+	 * A concurrent __handle_sysrq either got the old op or the new op.
+	 * Wait for it to go away before returning, so the code for an old
+	 * op is not freed (eg. on module unload) while it is in use.
+	 */
+	synchronize_rcu();
+
 	return retval;
 }
 
diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
index 2978ca5..610b720 100644
--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -179,7 +179,6 @@ struct uni_pagedir {
 	unsigned long	sum;
 	unsigned char	*inverse_translations[4];
 	u16		*inverse_trans_unicode;
-	int		readonly;
 };
 
 static struct uni_pagedir *dflt;
@@ -262,7 +261,7 @@ u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode)
 	int m;
 	if (glyph < 0 || glyph >= MAX_GLYPH)
 		return 0;
-	else if (!(p = (struct uni_pagedir *)*conp->vc_uni_pagedir_loc))
+	else if (!(p = *conp->vc_uni_pagedir_loc))
 		return glyph;
 	else if (use_unicode) {
 		if (!p->inverse_trans_unicode)
@@ -287,7 +286,7 @@ static void update_user_maps(void)
 	for (i = 0; i < MAX_NR_CONSOLES; i++) {
 		if (!vc_cons_allocated(i))
 			continue;
-		p = (struct uni_pagedir *)*vc_cons[i].d->vc_uni_pagedir_loc;
+		p = *vc_cons[i].d->vc_uni_pagedir_loc;
 		if (p && p != q) {
 			set_inverse_transl(vc_cons[i].d, p, USER_MAP);
 			set_inverse_trans_unicode(vc_cons[i].d, p);
@@ -418,10 +417,10 @@ void con_free_unimap(struct vc_data *vc)
 {
 	struct uni_pagedir *p;
 
-	p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+	p = *vc->vc_uni_pagedir_loc;
 	if (!p)
 		return;
-	*vc->vc_uni_pagedir_loc = 0;
+	*vc->vc_uni_pagedir_loc = NULL;
 	if (--p->refcount)
 		return;
 	con_release_unimap(p);
@@ -436,7 +435,7 @@ static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p)
 	for (i = 0; i < MAX_NR_CONSOLES; i++) {
 		if (!vc_cons_allocated(i))
 			continue;
-		q = (struct uni_pagedir *)*vc_cons[i].d->vc_uni_pagedir_loc;
+		q = *vc_cons[i].d->vc_uni_pagedir_loc;
 		if (!q || q == p || q->sum != p->sum)
 			continue;
 		for (j = 0; j < 32; j++) {
@@ -459,7 +458,7 @@ static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p)
 		}
 		if (j == 32) {
 			q->refcount++;
-			*conp->vc_uni_pagedir_loc = (unsigned long)q;
+			*conp->vc_uni_pagedir_loc = q;
 			con_release_unimap(p);
 			kfree(p);
 			return 1;
@@ -500,10 +499,7 @@ static int con_do_clear_unimap(struct vc_data *vc, struct unimapinit *ui)
 {
 	struct uni_pagedir *p, *q;
 
-	p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
-	if (p && p->readonly)
-		return -EIO;
-
+	p = *vc->vc_uni_pagedir_loc;
 	if (!p || --p->refcount) {
 		q = kzalloc(sizeof(*p), GFP_KERNEL);
 		if (!q) {
@@ -512,7 +508,7 @@ static int con_do_clear_unimap(struct vc_data *vc, struct unimapinit *ui)
 			return -ENOMEM;
 		}
 		q->refcount=1;
-		*vc->vc_uni_pagedir_loc = (unsigned long)q;
+		*vc->vc_uni_pagedir_loc = q;
 	} else {
 		if (p == dflt) dflt = NULL;
 		p->refcount++;
@@ -536,19 +532,13 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
 	int err = 0, err1, i;
 	struct uni_pagedir *p, *q;
 
+	if (!ct)
+		return 0;
+
 	console_lock();
 
 	/* Save original vc_unipagdir_loc in case we allocate a new one */
-	p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
-	if (p->readonly) {
-		console_unlock();
-		return -EIO;
-	}
-	
-	if (!ct) {
-		console_unlock();
-		return 0;
-	}
+	p = *vc->vc_uni_pagedir_loc;
 	
 	if (p->refcount > 1) {
 		int j, k;
@@ -564,7 +554,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
 		 * Since refcount was > 1, con_clear_unimap() allocated a
 		 * a new uni_pagedir for this vc.  Re: p != q
 		 */
-		q = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+		q = *vc->vc_uni_pagedir_loc;
 
 		/*
 		 * uni_pgdir is a 32*32*64 table with rows allocated
@@ -586,7 +576,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
 					err1 = con_insert_unipair(q, l, p2[k]);
 					if (err1) {
 						p->refcount++;
-						*vc->vc_uni_pagedir_loc = (unsigned long)p;
+						*vc->vc_uni_pagedir_loc = p;
 						con_release_unimap(q);
 						kfree(q);
 						console_unlock();
@@ -655,12 +645,12 @@ int con_set_default_unimap(struct vc_data *vc)
 	struct uni_pagedir *p;
 
 	if (dflt) {
-		p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+		p = *vc->vc_uni_pagedir_loc;
 		if (p == dflt)
 			return 0;
 
 		dflt->refcount++;
-		*vc->vc_uni_pagedir_loc = (unsigned long)dflt;
+		*vc->vc_uni_pagedir_loc = dflt;
 		if (p && !--p->refcount) {
 			con_release_unimap(p);
 			kfree(p);
@@ -674,7 +664,7 @@ int con_set_default_unimap(struct vc_data *vc)
 	if (err)
 		return err;
     
-	p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+	p = *vc->vc_uni_pagedir_loc;
 	q = dfont_unitable;
 	
 	for (i = 0; i < 256; i++)
@@ -685,7 +675,7 @@ int con_set_default_unimap(struct vc_data *vc)
 		}
 			
 	if (con_unify_unimap(vc, p)) {
-		dflt = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+		dflt = *vc->vc_uni_pagedir_loc;
 		return err;
 	}
 
@@ -713,9 +703,9 @@ int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
 	if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc)
 		return 0;
 	con_free_unimap(dst_vc);
-	q = (struct uni_pagedir *)*src_vc->vc_uni_pagedir_loc;
+	q = *src_vc->vc_uni_pagedir_loc;
 	q->refcount++;
-	*dst_vc->vc_uni_pagedir_loc = (long)q;
+	*dst_vc->vc_uni_pagedir_loc = q;
 	return 0;
 }
 EXPORT_SYMBOL(con_copy_unimap);
@@ -737,7 +727,7 @@ int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct uni
 
 	ect = 0;
 	if (*vc->vc_uni_pagedir_loc) {
-		p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc;
+		p = *vc->vc_uni_pagedir_loc;
 		for (i = 0; i < 32; i++)
 		if ((p1 = p->uni_pgdir[i]))
 			for (j = 0; j < 32; j++)
@@ -810,7 +800,7 @@ conv_uni_to_pc(struct vc_data *conp, long ucs)
 	if (!*conp->vc_uni_pagedir_loc)
 		return -3;
 
-	p = (struct uni_pagedir *)*conp->vc_uni_pagedir_loc;  
+	p = *conp->vc_uni_pagedir_loc;
 	if ((p1 = p->uni_pgdir[ucs >> 11]) &&
 	    (p2 = p1[(ucs >> 6) & 0x1f]) &&
 	    (h = p2[ucs & 0x3f]) < MAX_GLYPH)
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 3ad0b61..5e0f6ff 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -735,7 +735,7 @@ static void visual_init(struct vc_data *vc, int num, int init)
 	vc->vc_num = num;
 	vc->vc_display_fg = &master_display_fg;
 	vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
-	vc->vc_uni_pagedir = 0;
+	vc->vc_uni_pagedir = NULL;
 	vc->vc_hi_font_mask = 0;
 	vc->vc_complement_mask = 0;
 	vc->vc_can_do_color = 0;
@@ -1231,6 +1231,52 @@ static void default_attr(struct vc_data *vc)
 	vc->vc_color = vc->vc_def_color;
 }
 
+struct rgb { u8 r; u8 g; u8 b; };
+
+struct rgb rgb_from_256(int i)
+{
+	struct rgb c;
+	if (i < 8) {            /* Standard colours. */
+		c.r = i&1 ? 0xaa : 0x00;
+		c.g = i&2 ? 0xaa : 0x00;
+		c.b = i&4 ? 0xaa : 0x00;
+	} else if (i < 16) {
+		c.r = i&1 ? 0xff : 0x55;
+		c.g = i&2 ? 0xff : 0x55;
+		c.b = i&4 ? 0xff : 0x55;
+	} else if (i < 232) {   /* 6x6x6 colour cube. */
+		c.r = (i - 16) / 36 * 85 / 2;
+		c.g = (i - 16) / 6 % 6 * 85 / 2;
+		c.b = (i - 16) % 6 * 85 / 2;
+	} else                  /* Grayscale ramp. */
+		c.r = c.g = c.b = i * 10 - 2312;
+	return c;
+}
+
+static void rgb_foreground(struct vc_data *vc, struct rgb c)
+{
+	u8 hue, max = c.r;
+	if (c.g > max)
+		max = c.g;
+	if (c.b > max)
+		max = c.b;
+	hue = (c.r > max/2 ? 4 : 0)
+	    | (c.g > max/2 ? 2 : 0)
+	    | (c.b > max/2 ? 1 : 0);
+	if (hue == 7 && max <= 0x55)
+		hue = 0, vc->vc_intensity = 2;
+	else
+		vc->vc_intensity = (max > 0xaa) + 1;
+	vc->vc_color = (vc->vc_color & 0xf0) | hue;
+}
+
+static void rgb_background(struct vc_data *vc, struct rgb c)
+{
+	/* For backgrounds, err on the dark side. */
+	vc->vc_color = (vc->vc_color & 0x0f)
+		| (c.r&0x80) >> 1 | (c.g&0x80) >> 2 | (c.b&0x80) >> 3;
+}
+
 /* console_lock is held */
 static void csi_m(struct vc_data *vc)
 {
@@ -1302,8 +1348,7 @@ static void csi_m(struct vc_data *vc)
 			case 27:
 				vc->vc_reverse = 0;
 				break;
-			case 38:
-			case 48: /* ITU T.416
+			case 38: /* ITU T.416
 				  * Higher colour modes.
 				  * They break the usual properties of SGR codes
 				  * and thus need to be detected and ignored by
@@ -1315,15 +1360,41 @@ static void csi_m(struct vc_data *vc)
 				i++;
 				if (i > vc->vc_npar)
 					break;
-				if (vc->vc_par[i] == 5)      /* 256 colours */
-					i++;                 /* ubiquitous */
-				else if (vc->vc_par[i] == 2) /* 24 bit colours */
-					i += 3;              /* extremely rare */
+				if (vc->vc_par[i] == 5 &&  /* 256 colours */
+				    i < vc->vc_npar) {     /* ubiquitous */
+					i++;
+					rgb_foreground(vc,
+						rgb_from_256(vc->vc_par[i]));
+				} else if (vc->vc_par[i] == 2 &&  /* 24 bit */
+				           i <= vc->vc_npar + 3) {/* extremely rare */
+					struct rgb c = {r:vc->vc_par[i+1],
+							g:vc->vc_par[i+2],
+							b:vc->vc_par[i+3]};
+					rgb_foreground(vc, c);
+					i += 3;
+				}
 				/* Subcommands 3 (CMY) and 4 (CMYK) are so insane
-				 * that detecting them is not worth the few extra
-				 * bytes of kernel's size.
+				 * there's no point in supporting them.
 				 */
 				break;
+			case 48:
+				i++;
+				if (i > vc->vc_npar)
+					break;
+				if (vc->vc_par[i] == 5 &&  /* 256 colours */
+				    i < vc->vc_npar) {
+					i++;
+					rgb_background(vc,
+						rgb_from_256(vc->vc_par[i]));
+				} else if (vc->vc_par[i] == 2 && /* 24 bit */
+				           i <= vc->vc_npar + 3) {
+					struct rgb c = {r:vc->vc_par[i+1],
+							g:vc->vc_par[i+2],
+							b:vc->vc_par[i+3]};
+					rgb_background(vc, c);
+					i += 3;
+				}
+				break;
 			case 39:
 				vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
 				break;