Merge tag 'tty-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver updates from Greg KH:
 "Here are the big set of tty and serial driver changes for 5.18-rc1.

  Nothing major, some more good cleanups from Jiri and 2 new serial
  drivers. Highlights include:

   - termbits cleanups

   - export symbol cleanups and other core cleanups from Jiri Slaby

   - new sunplus and mvebu uart drivers (amazing that people are still
     creating new uarts...)

   - samsung serial driver cleanups

   - ldisc 29 is now "reserved" for experimental/development line
     disciplines

   - lots of other tiny fixes and cleanups to serial drivers and
     bindings

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (104 commits)
  vt_ioctl: fix potential spectre v1 in VT_DISALLOCATE
  serial: 8250: fix XOFF/XON sending when DMA is used
  tty: serial: samsung: Add ARTPEC-8 support
  dt-bindings: serial: samsung: Add ARTPEC-8 UART
  serial: sc16is7xx: Clear RS485 bits in the shutdown
  tty: serial: samsung: simplify getting OF match data
  tty: serial: samsung: constify variables and pointers
  tty: serial: samsung: constify s3c24xx_serial_drv_data members
  tty: serial: samsung: constify UART name
  tty: serial: samsung: constify s3c24xx_serial_drv_data
  tty: serial: samsung: reduce number of casts
  tty: serial: samsung: embed s3c2410_uartcfg in parent structure
  tty: serial: samsung: embed s3c24xx_uart_info in parent structure
  serial: 8250_tegra: mark acpi_device_id as unused with !ACPI
  tty: serial: bcm63xx: use more precise Kconfig symbol
  serial: SERIAL_SUNPLUS should depend on ARCH_SUNPLUS
  tty: serial: jsm: fix two assignments in if conditions
  tty: serial: jsm: remove redundant assignments to variable linestatus
  serial: 8250_mtk: make two read-only arrays static const
  serial: samsung_tty: do not unlock port->lock for uart_write_wakeup()
  ...

90 files changed, 2526 insertions, 917 deletions

diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c
index 1e60dbef676c..533d02b38e02 100644
--- a/drivers/tty/amiserial.c
+++ b/drivers/tty/amiserial.c
@@ -538,10 +538,8 @@ static void shutdown(struct tty_struct *tty, struct serial_state *info)
 	 */
 	free_irq(IRQ_AMIGA_VERTB, info);
 
-	if (info->xmit.buf) {
-		free_page((unsigned long) info->xmit.buf);
-		info->xmit.buf = NULL;
-	}
+	free_page((unsigned long)info->xmit.buf);
+	info->xmit.buf = NULL;
 
 	info->IER = 0;
 	amiga_custom.intena = IF_RBF | IF_TBE;
diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c
index 5ed19a9857ad..ad13532e92fe 100644
--- a/drivers/tty/goldfish.c
+++ b/drivers/tty/goldfish.c
@@ -434,7 +434,7 @@ static int goldfish_tty_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_GOLDFISH_TTY_EARLY_CONSOLE
-static void gf_early_console_putchar(struct uart_port *port, int ch)
+static void gf_early_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	__raw_writel(ch, port->membase);
 }
diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
index 8e0edb7d93fd..bd61f9372d83 100644
--- a/drivers/tty/hvc/hvc_dcc.c
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -15,7 +15,7 @@
 #define DCC_STATUS_RX		(1 << 30)
 #define DCC_STATUS_TX		(1 << 29)
 
-static void dcc_uart_console_putchar(struct uart_port *port, int ch)
+static void dcc_uart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (__dcc_getstatus() & DCC_STATUS_TX)
 		cpu_relax();
diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
index 82a76cac94de..32366caca662 100644
--- a/drivers/tty/hvc/hvc_iucv.c
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -1417,7 +1417,9 @@ out_error:
  */
 static	int __init hvc_iucv_config(char *val)
 {
-	 return kstrtoul(val, 10, &hvc_iucv_devices);
+	if (kstrtoul(val, 10, &hvc_iucv_devices))
+		pr_warn("hvc_iucv= invalid parameter value '%s'\n", val);
+	return 1;
 }
 
 
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index c858aff721c4..6ebd3e4ed859 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -275,9 +275,6 @@ struct mxser_port {
 	u8 read_status_mask;
 	u8 ignore_status_mask;
 	u8 xmit_fifo_size;
-	unsigned int xmit_head;
-	unsigned int xmit_tail;
-	unsigned int xmit_cnt;
 
 	spinlock_t slock;
 };
@@ -591,21 +588,7 @@ static void mxser_change_speed(struct tty_struct *tty, struct ktermios *old_term
 	}
 
 	/* byte size and parity */
-	switch (cflag & CSIZE) {
-	default:
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));
 
 	if (cflag & CSTOPB)
 		cval |= UART_LCR_STOP;
@@ -742,22 +725,21 @@ static void mxser_disable_and_clear_FIFO(struct mxser_port *info)
 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 {
 	struct mxser_port *info = container_of(port, struct mxser_port, port);
-	unsigned long page;
 	unsigned long flags;
+	int ret;
 
-	page = __get_free_page(GFP_KERNEL);
-	if (!page)
-		return -ENOMEM;
+	ret = tty_port_alloc_xmit_buf(port);
+	if (ret < 0)
+		return ret;
 
 	spin_lock_irqsave(&info->slock, flags);
 
 	if (!info->type) {
 		set_bit(TTY_IO_ERROR, &tty->flags);
-		free_page(page);
 		spin_unlock_irqrestore(&info->slock, flags);
-		return 0;
+		ret = 0;
+		goto err_free_xmit;
 	}
-	info->port.xmit_buf = (unsigned char *) page;
 
 	/*
 	 * Clear the FIFO buffers and disable them
@@ -775,8 +757,10 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 		if (capable(CAP_SYS_ADMIN)) {
 			set_bit(TTY_IO_ERROR, &tty->flags);
 			return 0;
-		} else
-			return -ENODEV;
+		}
+
+		ret = -ENODEV;
+		goto err_free_xmit;
 	}
 
 	/*
@@ -812,7 +796,7 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 	(void) inb(info->ioaddr + UART_MSR);
 
 	clear_bit(TTY_IO_ERROR, &tty->flags);
-	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+	kfifo_reset(&port->xmit_fifo);
 
 	/*
 	 * and set the speed of the serial port
@@ -821,6 +805,9 @@ static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
 	spin_unlock_irqrestore(&info->slock, flags);
 
 	return 0;
+err_free_xmit:
+	tty_port_free_xmit_buf(port);
+	return ret;
 }
 
 /*
@@ -855,14 +842,6 @@ static void mxser_shutdown_port(struct tty_port *port)
 	 */
 	wake_up_interruptible(&info->port.delta_msr_wait);
 
-	/*
-	 * Free the xmit buffer, if necessary
-	 */
-	if (info->port.xmit_buf) {
-		free_page((unsigned long) info->port.xmit_buf);
-		info->port.xmit_buf = NULL;
-	}
-
 	info->IER = 0;
 	outb(0x00, info->ioaddr + UART_IER);
 
@@ -877,6 +856,11 @@ static void mxser_shutdown_port(struct tty_port *port)
 		mxser_must_no_sw_flow_control(info->ioaddr);
 
 	spin_unlock_irqrestore(&info->slock, flags);
+
+	/* make sure ISR is not running while we free the buffer */
+	synchronize_irq(info->board->irq);
+
+	tty_port_free_xmit_buf(port);
 }
 
 /*
@@ -900,9 +884,8 @@ static void mxser_flush_buffer(struct tty_struct *tty)
 	struct mxser_port *info = tty->driver_data;
 	unsigned long flags;
 
-
 	spin_lock_irqsave(&info->slock, flags);
-	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+	kfifo_reset(&info->port.xmit_fifo);
 
 	outb(info->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
 		info->ioaddr + UART_FCR);
@@ -919,50 +902,34 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
 
 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
 {
-	int c, total = 0;
 	struct mxser_port *info = tty->driver_data;
 	unsigned long flags;
+	int written;
+	bool is_empty;
 
-	while (1) {
-		c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
-					  SERIAL_XMIT_SIZE - info->xmit_head));
-		if (c <= 0)
-			break;
-
-		memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
-		spin_lock_irqsave(&info->slock, flags);
-		info->xmit_head = (info->xmit_head + c) &
-				  (SERIAL_XMIT_SIZE - 1);
-		info->xmit_cnt += c;
-		spin_unlock_irqrestore(&info->slock, flags);
-
-		buf += c;
-		count -= c;
-		total += c;
-	}
+	spin_lock_irqsave(&info->slock, flags);
+	written = kfifo_in(&info->port.xmit_fifo, buf, count);
+	is_empty = kfifo_is_empty(&info->port.xmit_fifo);
+	spin_unlock_irqrestore(&info->slock, flags);
 
-	if (info->xmit_cnt && !tty->flow.stopped)
+	if (!is_empty && !tty->flow.stopped)
 		if (!tty->hw_stopped || mxser_16550A_or_MUST(info))
 			mxser_start_tx(info);
 
-	return total;
+	return written;
 }
 
 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
 {
 	struct mxser_port *info = tty->driver_data;
 	unsigned long flags;
-
-	if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
-		return 0;
+	int ret;
 
 	spin_lock_irqsave(&info->slock, flags);
-	info->port.xmit_buf[info->xmit_head++] = ch;
-	info->xmit_head &= SERIAL_XMIT_SIZE - 1;
-	info->xmit_cnt++;
+	ret = kfifo_put(&info->port.xmit_fifo, ch);
 	spin_unlock_irqrestore(&info->slock, flags);
 
-	return 1;
+	return ret;
 }
 
 
@@ -970,7 +937,7 @@ static void mxser_flush_chars(struct tty_struct *tty)
 {
 	struct mxser_port *info = tty->driver_data;
 
-	if (!info->xmit_cnt || tty->flow.stopped ||
+	if (kfifo_is_empty(&info->port.xmit_fifo) || tty->flow.stopped ||
 			(tty->hw_stopped && !mxser_16550A_or_MUST(info)))
 		return;
 
@@ -980,16 +947,15 @@ static void mxser_flush_chars(struct tty_struct *tty)
 static unsigned int mxser_write_room(struct tty_struct *tty)
 {
 	struct mxser_port *info = tty->driver_data;
-	int ret;
 
-	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
-	return ret < 0 ? 0 : ret;
+	return kfifo_avail(&info->port.xmit_fifo);
 }
 
 static unsigned int mxser_chars_in_buffer(struct tty_struct *tty)
 {
 	struct mxser_port *info = tty->driver_data;
-	return info->xmit_cnt;
+
+	return kfifo_len(&info->port.xmit_fifo);
 }
 
 /*
@@ -1378,7 +1344,7 @@ static void mxser_start(struct tty_struct *tty)
 	unsigned long flags;
 
 	spin_lock_irqsave(&info->slock, flags);
-	if (info->xmit_cnt)
+	if (!kfifo_is_empty(&info->port.xmit_fifo))
 		__mxser_start_tx(info);
 	spin_unlock_irqrestore(&info->slock, flags);
 }
@@ -1609,7 +1575,7 @@ static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port
 		return;
 	}
 
-	if (!port->xmit_cnt || tty->flow.stopped ||
+	if (kfifo_is_empty(&port->port.xmit_fifo) || tty->flow.stopped ||
 			(tty->hw_stopped && !mxser_16550A_or_MUST(port))) {
 		__mxser_stop_tx(port);
 		return;
@@ -1617,18 +1583,19 @@ static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port
 
 	count = port->xmit_fifo_size;
 	do {
-		outb(port->port.xmit_buf[port->xmit_tail++],
-			port->ioaddr + UART_TX);
-		port->xmit_tail &= SERIAL_XMIT_SIZE - 1;
-		port->icount.tx++;
-		if (!--port->xmit_cnt)
+		unsigned char c;
+
+		if (!kfifo_get(&port->port.xmit_fifo, &c))
 			break;
+
+		outb(c, port->ioaddr + UART_TX);
+		port->icount.tx++;
 	} while (--count > 0);
 
-	if (port->xmit_cnt < WAKEUP_CHARS)
+	if (kfifo_len(&port->port.xmit_fifo) < WAKEUP_CHARS)
 		tty_wakeup(tty);
 
-	if (!port->xmit_cnt)
+	if (kfifo_is_empty(&port->port.xmit_fifo))
 		__mxser_stop_tx(port);
 }
 
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
index 92e3433276f8..0180e1e4e75d 100644
--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -704,13 +704,10 @@ static const struct acpi_device_id serdev_acpi_devices_blacklist[] = {
 static acpi_status acpi_serdev_add_device(acpi_handle handle, u32 level,
 					  void *data, void **return_value)
 {
+	struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
 	struct serdev_controller *ctrl = data;
-	struct acpi_device *adev;
 
-	if (acpi_bus_get_device(handle, &adev))
-		return AE_OK;
-
-	if (acpi_device_enumerated(adev))
+	if (!adev || acpi_device_enumerated(adev))
 		return AE_OK;
 
 	/* Skip if black listed */
diff --git a/drivers/tty/serial/21285.c b/drivers/tty/serial/21285.c
index 09baef4ccc39..7520cc02fd4d 100644
--- a/drivers/tty/serial/21285.c
+++ b/drivers/tty/serial/21285.c
@@ -403,7 +403,7 @@ static void serial21285_setup_ports(void)
 }
 
 #ifdef CONFIG_SERIAL_21285_CONSOLE
-static void serial21285_console_putchar(struct uart_port *port, int ch)
+static void serial21285_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (*CSR_UARTFLG & 0x20)
 		barrier();
diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c
index 2350fb3bb5e4..93fe10c680fb 100644
--- a/drivers/tty/serial/8250/8250_aspeed_vuart.c
+++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c
@@ -82,7 +82,7 @@ static ssize_t lpc_address_show(struct device *dev,
 	addr = (aspeed_vuart_readb(vuart, ASPEED_VUART_ADDRH) << 8) |
 		(aspeed_vuart_readb(vuart, ASPEED_VUART_ADDRL));
 
-	return snprintf(buf, PAGE_SIZE - 1, "0x%x\n", addr);
+	return sysfs_emit(buf, "0x%x\n", addr);
 }
 
 static int aspeed_vuart_set_lpc_address(struct aspeed_vuart *vuart, u32 addr)
@@ -124,7 +124,7 @@ static ssize_t sirq_show(struct device *dev,
 	reg &= ASPEED_VUART_GCRB_HOST_SIRQ_MASK;
 	reg >>= ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT;
 
-	return snprintf(buf, PAGE_SIZE - 1, "%u\n", reg);
+	return sysfs_emit(buf, "%u\n", reg);
 }
 
 static int aspeed_vuart_set_sirq(struct aspeed_vuart *vuart, u32 sirq)
@@ -171,7 +171,7 @@ static ssize_t sirq_polarity_show(struct device *dev,
 	reg = aspeed_vuart_readb(vuart, ASPEED_VUART_GCRA);
 	reg &= ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY;
 
-	return snprintf(buf, PAGE_SIZE - 1, "%u\n", reg ? 1 : 0);
+	return sysfs_emit(buf, "%u\n", reg ? 1 : 0);
 }
 
 static void aspeed_vuart_set_sirq_polarity(struct aspeed_vuart *vuart,
@@ -487,7 +487,7 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 	port.port.irq = irq_of_parse_and_map(np, 0);
 	port.port.handle_irq = aspeed_vuart_handle_irq;
 	port.port.iotype = UPIO_MEM;
-	port.port.type = PORT_16550A;
+	port.port.type = PORT_ASPEED_VUART;
 	port.port.uartclk = clk;
 	port.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
 		| UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_NO_THRE_TEST;
diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
index fd95860cd661..2a1226a78a0c 100644
--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 
 #include "8250.h"
 
@@ -44,6 +45,10 @@ struct bcm2835aux_data {
 	u32 cntl;
 };
 
+struct bcm2835_aux_serial_driver_data {
+	resource_size_t offset;
+};
+
 static void bcm2835aux_rs485_start_tx(struct uart_8250_port *up)
 {
 	if (!(up->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
@@ -80,9 +85,12 @@ static void bcm2835aux_rs485_stop_tx(struct uart_8250_port *up)
 
 static int bcm2835aux_serial_probe(struct platform_device *pdev)
 {
+	const struct bcm2835_aux_serial_driver_data *bcm_data;
 	struct uart_8250_port up = { };
 	struct bcm2835aux_data *data;
+	resource_size_t offset = 0;
 	struct resource *res;
+	unsigned int uartclk;
 	int ret;
 
 	/* allocate the custom structure */
@@ -109,9 +117,7 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, data);
 
 	/* get the clock - this also enables the HW */
-	data->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(data->clk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(data->clk), "could not get clk\n");
+	data->clk = devm_clk_get_optional(&pdev->dev, NULL);
 
 	/* get the interrupt */
 	ret = platform_get_irq(pdev, 0);
@@ -125,8 +131,24 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "memory resource not found");
 		return -EINVAL;
 	}
-	up.port.mapbase = res->start;
-	up.port.mapsize = resource_size(res);
+
+	bcm_data = device_get_match_data(&pdev->dev);
+
+	/* Some UEFI implementations (e.g. tianocore/edk2 for the Raspberry Pi)
+	 * describe the miniuart with a base address that encompasses the auxiliary
+	 * registers shared between the miniuart and spi.
+	 *
+	 * This is due to historical reasons, see discussion here :
+	 * https://edk2.groups.io/g/devel/topic/87501357#84349
+	 *
+	 * We need to add the offset between the miniuart and auxiliary
+	 * registers to get the real miniuart base address.
+	 */
+	if (bcm_data)
+		offset = bcm_data->offset;
+
+	up.port.mapbase = res->start + offset;
+	up.port.mapsize = resource_size(res) - offset;
 
 	/* Check for a fixed line number */
 	ret = of_alias_get_id(pdev->dev.of_node, "serial");
@@ -141,12 +163,19 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	uartclk = clk_get_rate(data->clk);
+	if (!uartclk) {
+		ret = device_property_read_u32(&pdev->dev, "clock-frequency", &uartclk);
+		if (ret)
+			return dev_err_probe(&pdev->dev, ret, "could not get clk rate\n");
+	}
+
 	/* the HW-clock divider for bcm2835aux is 8,
 	 * but 8250 expects a divider of 16,
 	 * so we have to multiply the actual clock by 2
 	 * to get identical baudrates.
 	 */
-	up.port.uartclk = clk_get_rate(data->clk) * 2;
+	up.port.uartclk = uartclk * 2;
 
 	/* register the port */
 	ret = serial8250_register_8250_port(&up);
@@ -173,16 +202,27 @@ static int bcm2835aux_serial_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct bcm2835_aux_serial_driver_data bcm2835_acpi_data = {
+	.offset = 0x40,
+};
+
 static const struct of_device_id bcm2835aux_serial_match[] = {
 	{ .compatible = "brcm,bcm2835-aux-uart" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, bcm2835aux_serial_match);
 
+static const struct acpi_device_id bcm2835aux_serial_acpi_match[] = {
+	{ "BCM2836", (kernel_ulong_t)&bcm2835_acpi_data },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, bcm2835aux_serial_acpi_match);
+
 static struct platform_driver bcm2835aux_serial_driver = {
 	.driver = {
 		.name = "bcm2835-aux-uart",
 		.of_match_table = bcm2835aux_serial_match,
+		.acpi_match_table = bcm2835aux_serial_acpi_match,
 	},
 	.probe  = bcm2835aux_serial_probe,
 	.remove = bcm2835aux_serial_remove,
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 890fa7ddaa7f..b3c3f7e5851a 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -64,10 +64,19 @@ int serial8250_tx_dma(struct uart_8250_port *p)
 	struct uart_8250_dma		*dma = p->dma;
 	struct circ_buf			*xmit = &p->port.state->xmit;
 	struct dma_async_tx_descriptor	*desc;
+	struct uart_port		*up = &p->port;
 	int ret;
 
-	if (dma->tx_running)
+	if (dma->tx_running) {
+		if (up->x_char) {
+			dmaengine_pause(dma->txchan);
+			uart_xchar_out(up, UART_TX);
+			dmaengine_resume(dma->txchan);
+		}
 		return 0;
+	} else if (up->x_char) {
+		uart_xchar_out(up, UART_TX);
+	}
 
 	if (uart_tx_stopped(&p->port) || uart_circ_empty(xmit)) {
 		/* We have been called from __dma_tx_complete() */
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index c171ce6db691..e52585064565 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -86,7 +86,7 @@ static void serial8250_early_out(struct uart_port *port, int offset, int value)
 
 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 
-static void serial_putc(struct uart_port *port, int c)
+static void serial_putc(struct uart_port *port, unsigned char c)
 {
 	unsigned int status;
 
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index d502240bbcf2..7292917ac878 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -623,7 +623,12 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
 
 	maxnr = pci_resource_len(pcidev, bar) >> (board->reg_shift + 3);
 
-	nr_ports = board->num_ports ? board->num_ports : pcidev->device & 0x0f;
+	if (pcidev->vendor == PCI_VENDOR_ID_ACCESSIO)
+		nr_ports = BIT(((pcidev->device & 0x38) >> 3) - 1);
+	else if (board->num_ports)
+		nr_ports = board->num_ports;
+	else
+		nr_ports = pcidev->device & 0x0f;
 
 	priv = devm_kzalloc(&pcidev->dev, struct_size(priv, line, nr_ports), GFP_KERNEL);
 	if (!priv)
@@ -722,22 +727,6 @@ static int __maybe_unused exar_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(exar_pci_pm, exar_suspend, exar_resume);
 
-static const struct exar8250_board acces_com_2x = {
-	.num_ports	= 2,
-	.setup		= pci_xr17c154_setup,
-};
-
-static const struct exar8250_board acces_com_4x = {
-	.num_ports	= 4,
-	.setup		= pci_xr17c154_setup,
-};
-
-static const struct exar8250_board acces_com_8x = {
-	.num_ports	= 8,
-	.setup		= pci_xr17c154_setup,
-};
-
-
 static const struct exar8250_board pbn_fastcom335_2 = {
 	.num_ports	= 2,
 	.setup		= pci_fastcom335_setup,
@@ -822,13 +811,13 @@ static const struct exar8250_board pbn_exar_XR17V8358 = {
 	}
 
 static const struct pci_device_id exar_pci_tbl[] = {
-	EXAR_DEVICE(ACCESSIO, COM_2S, acces_com_2x),
-	EXAR_DEVICE(ACCESSIO, COM_4S, acces_com_4x),
-	EXAR_DEVICE(ACCESSIO, COM_8S, acces_com_8x),
-	EXAR_DEVICE(ACCESSIO, COM232_8, acces_com_8x),
-	EXAR_DEVICE(ACCESSIO, COM_2SM, acces_com_2x),
-	EXAR_DEVICE(ACCESSIO, COM_4SM, acces_com_4x),
-	EXAR_DEVICE(ACCESSIO, COM_8SM, acces_com_8x),
+	EXAR_DEVICE(ACCESSIO, COM_2S, pbn_exar_XR17C15x),
+	EXAR_DEVICE(ACCESSIO, COM_4S, pbn_exar_XR17C15x),
+	EXAR_DEVICE(ACCESSIO, COM_8S, pbn_exar_XR17C15x),
+	EXAR_DEVICE(ACCESSIO, COM232_8, pbn_exar_XR17C15x),
+	EXAR_DEVICE(ACCESSIO, COM_2SM, pbn_exar_XR17C15x),
+	EXAR_DEVICE(ACCESSIO, COM_4SM, pbn_exar_XR17C15x),
+	EXAR_DEVICE(ACCESSIO, COM_8SM, pbn_exar_XR17C15x),
 
 	CONNECT_DEVICE(XR17C152, UART_2_232, pbn_connect),
 	CONNECT_DEVICE(XR17C154, UART_4_232, pbn_connect),
diff --git a/drivers/tty/serial/8250/8250_ingenic.c b/drivers/tty/serial/8250/8250_ingenic.c
index 65402d05eff9..cff91aa03f29 100644
--- a/drivers/tty/serial/8250/8250_ingenic.c
+++ b/drivers/tty/serial/8250/8250_ingenic.c
@@ -52,7 +52,7 @@ static void early_out(struct uart_port *port, int offset, uint8_t value)
 	writel(value, port->membase + (offset << 2));
 }
 
-static void ingenic_early_console_putc(struct uart_port *port, int c)
+static void ingenic_early_console_putc(struct uart_port *port, unsigned char c)
 {
 	uint8_t lsr;
 
diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
index d3bafec7619d..0f5af061e0b4 100644
--- a/drivers/tty/serial/8250/8250_lpss.c
+++ b/drivers/tty/serial/8250/8250_lpss.c
@@ -117,8 +117,7 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 {
 	struct dw_dma_slave *param = &lpss->dma_param;
 	struct pci_dev *pdev = to_pci_dev(port->dev);
-	unsigned int dma_devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
-	struct pci_dev *dma_dev = pci_get_slot(pdev->bus, dma_devfn);
+	struct pci_dev *dma_dev;
 
 	switch (pdev->device) {
 	case PCI_DEVICE_ID_INTEL_BYT_UART1:
@@ -137,6 +136,8 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 		return -EINVAL;
 	}
 
+	dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
+
 	param->dma_dev = &dma_dev->dev;
 	param->m_master = 0;
 	param->p_master = 1;
@@ -152,6 +153,14 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 	return 0;
 }
 
+static void byt_serial_exit(struct lpss8250 *lpss)
+{
+	struct dw_dma_slave *param = &lpss->dma_param;
+
+	/* Paired with pci_get_slot() in the byt_serial_setup() above */
+	put_device(param->dma_dev);
+}
+
 static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 {
 	struct uart_8250_dma *dma = &lpss->data.dma;
@@ -170,6 +179,13 @@ static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 	return 0;
 }
 
+static void ehl_serial_exit(struct lpss8250 *lpss)
+{
+	struct uart_8250_port *up = serial8250_get_port(lpss->data.line);
+
+	up->dma = NULL;
+}
+
 #ifdef CONFIG_SERIAL_8250_DMA
 static const struct dw_dma_platform_data qrk_serial_dma_pdata = {
 	.nr_channels = 2,
@@ -344,8 +360,7 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	return 0;
 
 err_exit:
-	if (lpss->board->exit)
-		lpss->board->exit(lpss);
+	lpss->board->exit(lpss);
 	pci_free_irq_vectors(pdev);
 	return ret;
 }
@@ -356,8 +371,7 @@ static void lpss8250_remove(struct pci_dev *pdev)
 
 	serial8250_unregister_port(lpss->data.line);
 
-	if (lpss->board->exit)
-		lpss->board->exit(lpss);
+	lpss->board->exit(lpss);
 	pci_free_irq_vectors(pdev);
 }
 
@@ -365,12 +379,14 @@ static const struct lpss8250_board byt_board = {
 	.freq = 100000000,
 	.base_baud = 2764800,
 	.setup = byt_serial_setup,
+	.exit = byt_serial_exit,
 };
 
 static const struct lpss8250_board ehl_board = {
 	.freq = 200000000,
 	.base_baud = 12500000,
 	.setup = ehl_serial_setup,
+	.exit = ehl_serial_exit,
 };
 
 static const struct lpss8250_board qrk_board = {
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index efa0515139f8..a2a03acb04ad 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -73,6 +73,11 @@ static int pnw_setup(struct mid8250 *mid, struct uart_port *p)
 	return 0;
 }
 
+static void pnw_exit(struct mid8250 *mid)
+{
+	pci_dev_put(mid->dma_dev);
+}
+
 static int tng_handle_irq(struct uart_port *p)
 {
 	struct mid8250 *mid = p->private_data;
@@ -124,6 +129,11 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p)
 	return 0;
 }
 
+static void tng_exit(struct mid8250 *mid)
+{
+	pci_dev_put(mid->dma_dev);
+}
+
 static int dnv_handle_irq(struct uart_port *p)
 {
 	struct mid8250 *mid = p->private_data;
@@ -312,11 +322,9 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (!uart.port.membase)
 		return -ENOMEM;
 
-	if (mid->board->setup) {
-		ret = mid->board->setup(mid, &uart.port);
-		if (ret)
-			return ret;
-	}
+	ret = mid->board->setup(mid, &uart.port);
+	if (ret)
+		return ret;
 
 	ret = mid8250_dma_setup(mid, &uart);
 	if (ret)
@@ -330,9 +338,9 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	pci_set_drvdata(pdev, mid);
 	return 0;
+
 err:
-	if (mid->board->exit)
-		mid->board->exit(mid);
+	mid->board->exit(mid);
 	return ret;
 }
 
@@ -342,8 +350,7 @@ static void mid8250_remove(struct pci_dev *pdev)
 
 	serial8250_unregister_port(mid->line);
 
-	if (mid->board->exit)
-		mid->board->exit(mid);
+	mid->board->exit(mid);
 }
 
 static const struct mid8250_board pnw_board = {
@@ -351,6 +358,7 @@ static const struct mid8250_board pnw_board = {
 	.freq = 50000000,
 	.base_baud = 115200,
 	.setup = pnw_setup,
+	.exit = pnw_exit,
 };
 
 static const struct mid8250_board tng_board = {
@@ -358,6 +366,7 @@ static const struct mid8250_board tng_board = {
 	.freq = 38400000,
 	.base_baud = 1843200,
 	.setup = tng_setup,
+	.exit = tng_exit,
 };
 
 static const struct mid8250_board dnv_board = {
@@ -368,16 +377,14 @@ static const struct mid8250_board dnv_board = {
 	.exit = dnv_exit,
 };
 
-#define MID_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board }
-
 static const struct pci_device_id pci_ids[] = {
-	MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART1, pnw_board),
-	MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART2, pnw_board),
-	MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART3, pnw_board),
-	MID_DEVICE(PCI_DEVICE_ID_INTEL_TNG_UART, tng_board),
-	MID_DEVICE(PCI_DEVICE_ID_INTEL_CDF_UART, dnv_board),
-	MID_DEVICE(PCI_DEVICE_ID_INTEL_DNV_UART, dnv_board),
-	{ },
+	{ PCI_DEVICE_DATA(INTEL, PNW_UART1, &pnw_board) },
+	{ PCI_DEVICE_DATA(INTEL, PNW_UART2, &pnw_board) },
+	{ PCI_DEVICE_DATA(INTEL, PNW_UART3, &pnw_board) },
+	{ PCI_DEVICE_DATA(INTEL, TNG_UART, &tng_board) },
+	{ PCI_DEVICE_DATA(INTEL, CDF_UART, &dnv_board) },
+	{ PCI_DEVICE_DATA(INTEL, DNV_UART, &dnv_board) },
+	{ }
 };
 MODULE_DEVICE_TABLE(pci, pci_ids);
 
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index fb65dc601b23..f4a0caa56f84 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -289,10 +289,10 @@ static void
 mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
 			struct ktermios *old)
 {
-	unsigned short fraction_L_mapping[] = {
+	static const unsigned short fraction_L_mapping[] = {
 		0, 1, 0x5, 0x15, 0x55, 0x57, 0x57, 0x77, 0x7F, 0xFF, 0xFF
 	};
-	unsigned short fraction_M_mapping[] = {
+	static const unsigned short fraction_M_mapping[] = {
 		0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 3
 	};
 	struct uart_8250_port *up = up_to_u8250p(port);
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 73e5f1dbd075..ac8bfa042391 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -357,21 +357,7 @@ static void omap_8250_set_termios(struct uart_port *port,
 	unsigned char cval = 0;
 	unsigned int baud;
 
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
 
 	if (termios->c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 3b12bfc1ed67..318af6f13605 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -307,6 +307,14 @@ static const struct serial8250_config uart_config[] = {
 		.rxtrig_bytes	= {1, 32, 64, 112},
 		.flags		= UART_CAP_FIFO | UART_CAP_SLEEP,
 	},
+	[PORT_ASPEED_VUART] = {
+		.name		= "ASPEED VUART",
+		.fifo_size	= 16,
+		.tx_loadsz	= 16,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00,
+		.rxtrig_bytes	= {1, 4, 8, 14},
+		.flags		= UART_CAP_FIFO,
+	},
 };
 
 /* Uart divisor latch read */
@@ -1615,6 +1623,18 @@ static inline void start_tx_rs485(struct uart_port *port)
 	struct uart_8250_port *up = up_to_u8250p(port);
 	struct uart_8250_em485 *em485 = up->em485;
 
+	/*
+	 * While serial8250_em485_handle_stop_tx() is a noop if
+	 * em485->active_timer != &em485->stop_tx_timer, it might happen that
+	 * the timer is still armed and triggers only after the current bunch of
+	 * chars is send and em485->active_timer == &em485->stop_tx_timer again.
+	 * So cancel the timer. There is still a theoretical race condition if
+	 * the timer is already running and only comes around to check for
+	 * em485->active_timer when &em485->stop_tx_timer is armed again.
+	 */
+	if (em485->active_timer == &em485->stop_tx_timer)
+		hrtimer_try_to_cancel(&em485->stop_tx_timer);
+
 	em485->active_timer = NULL;
 
 	if (em485->tx_stopped) {
@@ -1657,6 +1677,9 @@ static void serial8250_start_tx(struct uart_port *port)
 
 	serial8250_rpm_get_tx(up);
 
+	if (!port->x_char && uart_circ_empty(&port->state->xmit))
+		return;
+
 	if (em485 &&
 	    em485->active_timer == &em485->start_tx_timer)
 		return;
@@ -1799,9 +1822,7 @@ void serial8250_tx_chars(struct uart_8250_port *up)
 	int count;
 
 	if (port->x_char) {
-		serial_out(up, UART_TX, port->x_char);
-		port->icount.tx++;
-		port->x_char = 0;
+		uart_xchar_out(port, UART_TX);
 		return;
 	}
 	if (uart_tx_stopped(port)) {
@@ -2582,21 +2603,7 @@ static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
 {
 	unsigned char cval;
 
-	switch (c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(c_cflag));
 
 	if (c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;
@@ -3296,7 +3303,7 @@ EXPORT_SYMBOL_GPL(serial8250_set_defaults);
 
 #ifdef CONFIG_SERIAL_8250_CONSOLE
 
-static void serial8250_console_putchar(struct uart_port *port, int ch)
+static void serial8250_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct uart_8250_port *up = up_to_u8250p(port);
 
diff --git a/drivers/tty/serial/8250/8250_tegra.c b/drivers/tty/serial/8250/8250_tegra.c
index e13ae18b0713..e7cddeec9d8e 100644
--- a/drivers/tty/serial/8250/8250_tegra.c
+++ b/drivers/tty/serial/8250/8250_tegra.c
@@ -175,7 +175,7 @@ static const struct of_device_id tegra_uart_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, tegra_uart_of_match);
 
-static const struct acpi_device_id tegra_uart_acpi_match[] = {
+static const struct acpi_device_id tegra_uart_acpi_match[] __maybe_unused = {
 	{ "NVDA0100", 0 },
 	{ },
 };
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 9d415a38cc71..cd93ea6eed65 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -479,11 +479,12 @@ config SERIAL_8250_LPSS
 	select DW_DMAC_PCI if (SERIAL_8250_DMA && X86_INTEL_LPSS)
 	select RATIONAL
 	help
-	  Selecting this option will enable handling of the extra features
-	  present on the UART found on various Intel platforms such as:
+	  Selecting this option will enable handling of the UART found on
+	  various Intel platforms such as:
 	    - Intel Baytrail SoC
 	    - Intel Braswell SoC
 	    - Intel Quark X1000 SoC
+	  that are not covered by the more generic SERIAL_8250_PCI option.
 
 config SERIAL_8250_MID
 	tristate "Support for serial ports on Intel MID platforms"
@@ -494,17 +495,18 @@ config SERIAL_8250_MID
 	select HSU_DMA_PCI if (HSU_DMA && X86_INTEL_MID)
 	select RATIONAL
 	help
-	  Selecting this option will enable handling of the extra features
-	  present on the UART found on Intel Medfield SOC and various other
-	  Intel platforms.
+	  Selecting this option will enable handling of the UART found on
+	  Intel Medfield SOC and various other Intel platforms that is not
+	  covered by the more generic SERIAL_8250_PCI option.
 
 config SERIAL_8250_PERICOM
 	tristate "Support for Pericom and Acces I/O serial ports"
 	default SERIAL_8250
 	depends on SERIAL_8250 && PCI
 	help
-	  Selecting this option will enable handling of the extra features
-	  present on the Pericom and Acces I/O UARTs.
+	  Selecting this option will enable handling of the Pericom and Acces
+	  I/O UARTs that are not covered by the more generic SERIAL_8250_PCI
+	  option.
 
 config SERIAL_8250_PXA
 	tristate "PXA serial port support"
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 0e5ccb25bdb1..6949e883ffab 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -139,6 +139,7 @@ config SERIAL_ATMEL_CONSOLE
 	bool "Support for console on AT91 serial port"
 	depends on SERIAL_ATMEL=y
 	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 	help
 	  Say Y here if you wish to use an on-chip UART on a Atmel
 	  AT91 processor as the system console (the system
@@ -236,7 +237,7 @@ config SERIAL_CLPS711X_CONSOLE
 
 config SERIAL_SAMSUNG
 	tristate "Samsung SoC serial support"
-	depends on PLAT_SAMSUNG || ARCH_S5PV210 || ARCH_EXYNOS || ARCH_APPLE || COMPILE_TEST
+	depends on PLAT_SAMSUNG || ARCH_S5PV210 || ARCH_EXYNOS || ARCH_APPLE || ARCH_ARTPEC || COMPILE_TEST
 	select SERIAL_CORE
 	help
 	  Support for the on-chip UARTs on the Samsung
@@ -1099,7 +1100,8 @@ config SERIAL_TIMBERDALE
 config SERIAL_BCM63XX
 	tristate "Broadcom BCM63xx/BCM33xx UART support"
 	select SERIAL_CORE
-	depends on COMMON_CLK
+	depends on ARCH_BCM4908 || ARCH_BCM_63XX || BCM63XX || BMIPS_GENERIC || COMPILE_TEST
+	default ARCH_BCM4908 || ARCH_BCM_63XX || BCM63XX || BMIPS_GENERIC
 	help
 	  This enables the driver for the onchip UART core found on
 	  the following chipsets:
@@ -1445,6 +1447,7 @@ config SERIAL_STM32_CONSOLE
 config SERIAL_MVEBU_UART
 	bool "Marvell EBU serial port support"
 	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on COMMON_CLK
 	select SERIAL_CORE
 	help
 	  This driver is for Marvell EBU SoC's UART. If you have a machine
@@ -1562,6 +1565,31 @@ config SERIAL_LITEUART_CONSOLE
 	  and warnings and which allows logins in single user mode).
 	  Otherwise, say 'N'.
 
+config SERIAL_SUNPLUS
+	tristate "Sunplus UART support"
+	depends on ARCH_SUNPLUS || COMPILE_TEST
+	select SERIAL_CORE
+	help
+	  Select this option if you would like to use Sunplus serial port on
+	  Sunplus SoC SP7021.
+	  If you enable this option, Sunplus serial ports in the system will
+	  be registered as ttySUPx.
+	  This driver can also be built as a module. If so, the module will be
+	  called sunplus-uart.
+
+config SERIAL_SUNPLUS_CONSOLE
+	bool "Console on Sunplus UART"
+	depends on SERIAL_SUNPLUS
+	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
+	help
+	  Select this option if you would like to use a Sunplus UART as the
+	  system console.
+	  Even if you say Y here, the currently visible virtual console
+	  (/dev/tty0) will still be used as the system console by default, but
+	  you can alter that using a kernel command line option such as
+	  "console=ttySUPx".
+
 endmenu
 
 config SERIAL_MCTRL_GPIO
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 7da0856cd198..61cc8de95571 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -87,6 +87,7 @@ obj-$(CONFIG_SERIAL_RDA)	+= rda-uart.o
 obj-$(CONFIG_SERIAL_MILBEAUT_USIO) += milbeaut_usio.o
 obj-$(CONFIG_SERIAL_SIFIVE)	+= sifive.o
 obj-$(CONFIG_SERIAL_LITEUART) += liteuart.o
+obj-$(CONFIG_SERIAL_SUNPLUS)	+= sunplus-uart.o
 
 # GPIOLIB helpers for modem control lines
 obj-$(CONFIG_SERIAL_MCTRL_GPIO)	+= serial_mctrl_gpio.o
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index 37bffe406b18..1c16345d0a1f 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -298,7 +298,7 @@ static struct altera_jtaguart altera_jtaguart_ports[ALTERA_JTAGUART_MAXPORTS];
 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE)
 
 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
-static void altera_jtaguart_console_putc(struct uart_port *port, int c)
+static void altera_jtaguart_console_putc(struct uart_port *port, unsigned char c)
 {
 	unsigned long status;
 	unsigned long flags;
@@ -318,7 +318,7 @@ static void altera_jtaguart_console_putc(struct uart_port *port, int c)
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 #else
-static void altera_jtaguart_console_putc(struct uart_port *port, int c)
+static void altera_jtaguart_console_putc(struct uart_port *port, unsigned char c)
 {
 	unsigned long flags;
 
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 64a352b40197..8b749ed557c6 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -438,7 +438,7 @@ static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];
 
 #if defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE)
 
-static void altera_uart_console_putc(struct uart_port *port, int c)
+static void altera_uart_console_putc(struct uart_port *port, unsigned char c)
 {
 	while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
 		 ALTERA_UART_STATUS_TRDY_MSK))
diff --git a/drivers/tty/serial/amba-pl010.c b/drivers/tty/serial/amba-pl010.c
index 47654073123d..fae0b581ff42 100644
--- a/drivers/tty/serial/amba-pl010.c
+++ b/drivers/tty/serial/amba-pl010.c
@@ -110,38 +110,38 @@ static void pl010_enable_ms(struct uart_port *port)
 	writel(cr, uap->port.membase + UART010_CR);
 }
 
-static void pl010_rx_chars(struct uart_amba_port *uap)
+static void pl010_rx_chars(struct uart_port *port)
 {
 	unsigned int status, ch, flag, rsr, max_count = 256;
 
-	status = readb(uap->port.membase + UART01x_FR);
+	status = readb(port->membase + UART01x_FR);
 	while (UART_RX_DATA(status) && max_count--) {
-		ch = readb(uap->port.membase + UART01x_DR);
+		ch = readb(port->membase + UART01x_DR);
 		flag = TTY_NORMAL;
 
-		uap->port.icount.rx++;
+		port->icount.rx++;
 
 		/*
 		 * Note that the error handling code is
 		 * out of the main execution path
 		 */
-		rsr = readb(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
+		rsr = readb(port->membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
 		if (unlikely(rsr & UART01x_RSR_ANY)) {
-			writel(0, uap->port.membase + UART01x_ECR);
+			writel(0, port->membase + UART01x_ECR);
 
 			if (rsr & UART01x_RSR_BE) {
 				rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
-				uap->port.icount.brk++;
-				if (uart_handle_break(&uap->port))
+				port->icount.brk++;
+				if (uart_handle_break(port))
 					goto ignore_char;
 			} else if (rsr & UART01x_RSR_PE)
-				uap->port.icount.parity++;
+				port->icount.parity++;
 			else if (rsr & UART01x_RSR_FE)
-				uap->port.icount.frame++;
+				port->icount.frame++;
 			if (rsr & UART01x_RSR_OE)
-				uap->port.icount.overrun++;
+				port->icount.overrun++;
 
-			rsr &= uap->port.read_status_mask;
+			rsr &= port->read_status_mask;
 
 			if (rsr & UART01x_RSR_BE)
 				flag = TTY_BREAK;
@@ -151,56 +151,57 @@ static void pl010_rx_chars(struct uart_amba_port *uap)
 				flag = TTY_FRAME;
 		}
 
-		if (uart_handle_sysrq_char(&uap->port, ch))
+		if (uart_handle_sysrq_char(port, ch))
 			goto ignore_char;
 
-		uart_insert_char(&uap->port, rsr, UART01x_RSR_OE, ch, flag);
+		uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag);
 
 	ignore_char:
-		status = readb(uap->port.membase + UART01x_FR);
+		status = readb(port->membase + UART01x_FR);
 	}
-	tty_flip_buffer_push(&uap->port.state->port);
+	tty_flip_buffer_push(&port->state->port);
 }
 
-static void pl010_tx_chars(struct uart_amba_port *uap)
+static void pl010_tx_chars(struct uart_port *port)
 {
-	struct circ_buf *xmit = &uap->port.state->xmit;
+	struct circ_buf *xmit = &port->state->xmit;
 	int count;
 
-	if (uap->port.x_char) {
-		writel(uap->port.x_char, uap->port.membase + UART01x_DR);
-		uap->port.icount.tx++;
-		uap->port.x_char = 0;
+	if (port->x_char) {
+		writel(port->x_char, port->membase + UART01x_DR);
+		port->icount.tx++;
+		port->x_char = 0;
 		return;
 	}
-	if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
-		pl010_stop_tx(&uap->port);
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+		pl010_stop_tx(port);
 		return;
 	}
 
-	count = uap->port.fifosize >> 1;
+	count = port->fifosize >> 1;
 	do {
-		writel(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
+		writel(xmit->buf[xmit->tail], port->membase + UART01x_DR);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		uap->port.icount.tx++;
+		port->icount.tx++;
 		if (uart_circ_empty(xmit))
 			break;
 	} while (--count > 0);
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(&uap->port);
+		uart_write_wakeup(port);
 
 	if (uart_circ_empty(xmit))
-		pl010_stop_tx(&uap->port);
+		pl010_stop_tx(port);
 }
 
 static void pl010_modem_status(struct uart_amba_port *uap)
 {
+	struct uart_port *port = &uap->port;
 	unsigned int status, delta;
 
-	writel(0, uap->port.membase + UART010_ICR);
+	writel(0, port->membase + UART010_ICR);
 
-	status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+	status = readb(port->membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
 
 	delta = status ^ uap->old_status;
 	uap->old_status = status;
@@ -209,65 +210,63 @@ static void pl010_modem_status(struct uart_amba_port *uap)
 		return;
 
 	if (delta & UART01x_FR_DCD)
-		uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
+		uart_handle_dcd_change(port, status & UART01x_FR_DCD);
 
 	if (delta & UART01x_FR_DSR)
-		uap->port.icount.dsr++;
+		port->icount.dsr++;
 
 	if (delta & UART01x_FR_CTS)
-		uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
+		uart_handle_cts_change(port, status & UART01x_FR_CTS);
 
-	wake_up_interruptible(&uap->port.state->port.delta_msr_wait);
+	wake_up_interruptible(&port->state->port.delta_msr_wait);
 }
 
 static irqreturn_t pl010_int(int irq, void *dev_id)
 {
 	struct uart_amba_port *uap = dev_id;
+	struct uart_port *port = &uap->port;
 	unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
 	int handled = 0;
 
-	spin_lock(&uap->port.lock);
+	spin_lock(&port->lock);
 
-	status = readb(uap->port.membase + UART010_IIR);
+	status = readb(port->membase + UART010_IIR);
 	if (status) {
 		do {
 			if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
-				pl010_rx_chars(uap);
+				pl010_rx_chars(port);
 			if (status & UART010_IIR_MIS)
 				pl010_modem_status(uap);
 			if (status & UART010_IIR_TIS)
-				pl010_tx_chars(uap);
+				pl010_tx_chars(port);
 
 			if (pass_counter-- == 0)
 				break;
 
-			status = readb(uap->port.membase + UART010_IIR);
+			status = readb(port->membase + UART010_IIR);
 		} while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
 				   UART010_IIR_TIS));
 		handled = 1;
 	}
 
-	spin_unlock(&uap->port.lock);
+	spin_unlock(&port->lock);
 
 	return IRQ_RETVAL(handled);
 }
 
 static unsigned int pl010_tx_empty(struct uart_port *port)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
-	unsigned int status = readb(uap->port.membase + UART01x_FR);
+	unsigned int status = readb(port->membase + UART01x_FR);
+
 	return status & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
 }
 
 static unsigned int pl010_get_mctrl(struct uart_port *port)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned int result = 0;
 	unsigned int status;
 
-	status = readb(uap->port.membase + UART01x_FR);
+	status = readb(port->membase + UART01x_FR);
 	if (status & UART01x_FR_DCD)
 		result |= TIOCM_CAR;
 	if (status & UART01x_FR_DSR)
@@ -284,24 +283,22 @@ static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
 		container_of(port, struct uart_amba_port, port);
 
 	if (uap->data)
-		uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl);
+		uap->data->set_mctrl(uap->dev, port->membase, mctrl);
 }
 
 static void pl010_break_ctl(struct uart_port *port, int break_state)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned long flags;
 	unsigned int lcr_h;
 
-	spin_lock_irqsave(&uap->port.lock, flags);
-	lcr_h = readb(uap->port.membase + UART010_LCRH);
+	spin_lock_irqsave(&port->lock, flags);
+	lcr_h = readb(port->membase + UART010_LCRH);
 	if (break_state == -1)
 		lcr_h |= UART01x_LCRH_BRK;
 	else
 		lcr_h &= ~UART01x_LCRH_BRK;
-	writel(lcr_h, uap->port.membase + UART010_LCRH);
-	spin_unlock_irqrestore(&uap->port.lock, flags);
+	writel(lcr_h, port->membase + UART010_LCRH);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static int pl010_startup(struct uart_port *port)
@@ -317,25 +314,25 @@ static int pl010_startup(struct uart_port *port)
 	if (retval)
 		goto out;
 
-	uap->port.uartclk = clk_get_rate(uap->clk);
+	port->uartclk = clk_get_rate(uap->clk);
 
 	/*
 	 * Allocate the IRQ
 	 */
-	retval = request_irq(uap->port.irq, pl010_int, 0, "uart-pl010", uap);
+	retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", uap);
 	if (retval)
 		goto clk_dis;
 
 	/*
 	 * initialise the old status of the modem signals
 	 */
-	uap->old_status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
+	uap->old_status = readb(port->membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
 
 	/*
 	 * Finally, enable interrupts
 	 */
 	writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE,
-	       uap->port.membase + UART010_CR);
+	       port->membase + UART010_CR);
 
 	return 0;
 
@@ -353,17 +350,17 @@ static void pl010_shutdown(struct uart_port *port)
 	/*
 	 * Free the interrupt
 	 */
-	free_irq(uap->port.irq, uap);
+	free_irq(port->irq, uap);
 
 	/*
 	 * disable all interrupts, disable the port
 	 */
-	writel(0, uap->port.membase + UART010_CR);
+	writel(0, port->membase + UART010_CR);
 
 	/* disable break condition and fifos */
-	writel(readb(uap->port.membase + UART010_LCRH) &
+	writel(readb(port->membase + UART010_LCRH) &
 		~(UART01x_LCRH_BRK | UART01x_LCRH_FEN),
-	       uap->port.membase + UART010_LCRH);
+	       port->membase + UART010_LCRH);
 
 	/*
 	 * Shut down the clock producer
@@ -375,8 +372,6 @@ static void
 pl010_set_termios(struct uart_port *port, struct ktermios *termios,
 		     struct ktermios *old)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned int lcr_h, old_cr;
 	unsigned long flags;
 	unsigned int baud, quot;
@@ -384,7 +379,7 @@ pl010_set_termios(struct uart_port *port, struct ktermios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	baud = uart_get_baud_rate(port, termios, old, 0, uap->port.uartclk/16); 
+	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
 	quot = uart_get_divisor(port, baud);
 
 	switch (termios->c_cflag & CSIZE) {
@@ -408,63 +403,63 @@ pl010_set_termios(struct uart_port *port, struct ktermios *termios,
 		if (!(termios->c_cflag & PARODD))
 			lcr_h |= UART01x_LCRH_EPS;
 	}
-	if (uap->port.fifosize > 1)
+	if (port->fifosize > 1)
 		lcr_h |= UART01x_LCRH_FEN;
 
-	spin_lock_irqsave(&uap->port.lock, flags);
+	spin_lock_irqsave(&port->lock, flags);
 
 	/*
 	 * Update the per-port timeout.
 	 */
 	uart_update_timeout(port, termios->c_cflag, baud);
 
-	uap->port.read_status_mask = UART01x_RSR_OE;
+	port->read_status_mask = UART01x_RSR_OE;
 	if (termios->c_iflag & INPCK)
-		uap->port.read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
+		port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 	if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
-		uap->port.read_status_mask |= UART01x_RSR_BE;
+		port->read_status_mask |= UART01x_RSR_BE;
 
 	/*
 	 * Characters to ignore
 	 */
-	uap->port.ignore_status_mask = 0;
+	port->ignore_status_mask = 0;
 	if (termios->c_iflag & IGNPAR)
-		uap->port.ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
+		port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
 	if (termios->c_iflag & IGNBRK) {
-		uap->port.ignore_status_mask |= UART01x_RSR_BE;
+		port->ignore_status_mask |= UART01x_RSR_BE;
 		/*
 		 * If we're ignoring parity and break indicators,
 		 * ignore overruns too (for real raw support).
 		 */
 		if (termios->c_iflag & IGNPAR)
-			uap->port.ignore_status_mask |= UART01x_RSR_OE;
+			port->ignore_status_mask |= UART01x_RSR_OE;
 	}
 
 	/*
 	 * Ignore all characters if CREAD is not set.
 	 */
 	if ((termios->c_cflag & CREAD) == 0)
-		uap->port.ignore_status_mask |= UART_DUMMY_RSR_RX;
+		port->ignore_status_mask |= UART_DUMMY_RSR_RX;
 
-	old_cr = readb(uap->port.membase + UART010_CR) & ~UART010_CR_MSIE;
+	old_cr = readb(port->membase + UART010_CR) & ~UART010_CR_MSIE;
 
 	if (UART_ENABLE_MS(port, termios->c_cflag))
 		old_cr |= UART010_CR_MSIE;
 
 	/* Set baud rate */
 	quot -= 1;
-	writel((quot & 0xf00) >> 8, uap->port.membase + UART010_LCRM);
-	writel(quot & 0xff, uap->port.membase + UART010_LCRL);
+	writel((quot & 0xf00) >> 8, port->membase + UART010_LCRM);
+	writel(quot & 0xff, port->membase + UART010_LCRL);
 
 	/*
 	 * ----------v----------v----------v----------v-----
 	 * NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
 	 * ----------^----------^----------^----------^-----
 	 */
-	writel(lcr_h, uap->port.membase + UART010_LCRH);
-	writel(old_cr, uap->port.membase + UART010_CR);
+	writel(lcr_h, port->membase + UART010_LCRH);
+	writel(old_cr, port->membase + UART010_CR);
 
-	spin_unlock_irqrestore(&uap->port.lock, flags);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void pl010_set_ldisc(struct uart_port *port, struct ktermios *termios)
@@ -556,23 +551,22 @@ static struct uart_amba_port *amba_ports[UART_NR];
 
 #ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
 
-static void pl010_console_putchar(struct uart_port *port, int ch)
+static void pl010_console_putchar(struct uart_port *port, unsigned char ch)
 {
-	struct uart_amba_port *uap =
-		container_of(port, struct uart_amba_port, port);
 	unsigned int status;
 
 	do {
-		status = readb(uap->port.membase + UART01x_FR);
+		status = readb(port->membase + UART01x_FR);
 		barrier();
 	} while (!UART_TX_READY(status));
-	writel(ch, uap->port.membase + UART01x_DR);
+	writel(ch, port->membase + UART01x_DR);
 }
 
 static void
 pl010_console_write(struct console *co, const char *s, unsigned int count)
 {
 	struct uart_amba_port *uap = amba_ports[co->index];
+	struct uart_port *port = &uap->port;
 	unsigned int status, old_cr;
 
 	clk_enable(uap->clk);
@@ -580,20 +574,20 @@ pl010_console_write(struct console *co, const char *s, unsigned int count)
 	/*
 	 *	First save the CR then disable the interrupts
 	 */
-	old_cr = readb(uap->port.membase + UART010_CR);
-	writel(UART01x_CR_UARTEN, uap->port.membase + UART010_CR);
+	old_cr = readb(port->membase + UART010_CR);
+	writel(UART01x_CR_UARTEN, port->membase + UART010_CR);
 
-	uart_console_write(&uap->port, s, count, pl010_console_putchar);
+	uart_console_write(port, s, count, pl010_console_putchar);
 
 	/*
 	 *	Finally, wait for transmitter to become empty
 	 *	and restore the TCR
 	 */
 	do {
-		status = readb(uap->port.membase + UART01x_FR);
+		status = readb(port->membase + UART01x_FR);
 		barrier();
 	} while (status & UART01x_FR_BUSY);
-	writel(old_cr, uap->port.membase + UART010_CR);
+	writel(old_cr, port->membase + UART010_CR);
 
 	clk_disable(uap->clk);
 }
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index ba053a68529f..51ecb050ae40 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2255,7 +2255,7 @@ static struct uart_amba_port *amba_ports[UART_NR];
 
 #ifdef CONFIG_SERIAL_AMBA_PL011_CONSOLE
 
-static void pl011_console_putchar(struct uart_port *port, int ch)
+static void pl011_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct uart_amba_port *uap =
 	    container_of(port, struct uart_amba_port, port);
@@ -2471,7 +2471,7 @@ static struct console amba_console = {
 
 #define AMBA_CONSOLE	(&amba_console)
 
-static void qdf2400_e44_putc(struct uart_port *port, int c)
+static void qdf2400_e44_putc(struct uart_port *port, unsigned char c)
 {
 	while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
 		cpu_relax();
@@ -2487,7 +2487,7 @@ static void qdf2400_e44_early_write(struct console *con, const char *s, unsigned
 	uart_console_write(&dev->port, s, n, qdf2400_e44_putc);
 }
 
-static void pl011_putc(struct uart_port *port, int c)
+static void pl011_putc(struct uart_port *port, unsigned char c)
 {
 	while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
 		cpu_relax();
diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index d8c937bdf3f9..9ef82d870ff2 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -413,7 +413,7 @@ static void apbuart_flush_fifo(struct uart_port *port)
 
 #ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE
 
-static void apbuart_console_putchar(struct uart_port *port, int ch)
+static void apbuart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	unsigned int status;
 	do {
diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 8cabe50c4a33..6269dbf93546 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -613,7 +613,7 @@ static void ar933x_uart_wait_xmitr(struct ar933x_uart_port *up)
 	} while ((status & AR933X_UART_DATA_TX_CSR) == 0);
 }
 
-static void ar933x_uart_console_putchar(struct uart_port *port, int ch)
+static void ar933x_uart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct ar933x_uart_port *up =
 		container_of(port, struct ar933x_uart_port, port);
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 596217d10d5c..2a09e92ef9ed 100644
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -508,7 +508,7 @@ static int arc_serial_console_setup(struct console *co, char *options)
 	return uart_set_options(port, co, baud, parity, bits, flow);
 }
 
-static void arc_serial_console_putchar(struct uart_port *port, int ch)
+static void arc_serial_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (!(UART_GET_STATUS(port) & TXEMPTY))
 		cpu_relax();
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index c370eddc651b..3a45e4fc7993 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -8,6 +8,7 @@
  *
  *  DMA support added by Chip Coldwell.
  */
+#include <linux/circ_buf.h>
 #include <linux/tty.h>
 #include <linux/ioport.h>
 #include <linux/slab.h>
@@ -2540,7 +2541,7 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
 }
 
 #ifdef CONFIG_SERIAL_ATMEL_CONSOLE
-static void atmel_console_putchar(struct uart_port *port, int ch)
+static void atmel_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (!(atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXRDY))
 		cpu_relax();
@@ -2672,6 +2673,30 @@ static struct console atmel_console = {
 	.data		= &atmel_uart,
 };
 
+static void atmel_serial_early_write(struct console *con, const char *s,
+				     unsigned int n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, atmel_console_putchar);
+}
+
+static int __init atmel_early_console_setup(struct earlycon_device *device,
+					    const char *options)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = atmel_serial_early_write;
+
+	return 0;
+}
+
+OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91rm9200-usart",
+		    atmel_early_console_setup);
+OF_EARLYCON_DECLARE(atmel_serial, "atmel,at91sam9260-usart",
+		    atmel_early_console_setup);
+
 #define ATMEL_CONSOLE_DEVICE	(&atmel_console)
 
 #else
diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c
index 6471a54b616b..53b43174aa40 100644
--- a/drivers/tty/serial/bcm63xx_uart.c
+++ b/drivers/tty/serial/bcm63xx_uart.c
@@ -681,7 +681,7 @@ static void wait_for_xmitr(struct uart_port *port)
 /*
  * output given char
  */
-static void bcm_console_putchar(struct uart_port *port, int ch)
+static void bcm_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	wait_for_xmitr(port);
 	bcm_uart_writel(port, ch, UART_FIFO_REG);
diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index 95abc6faa3d5..b9b66ad31a08 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -348,7 +348,7 @@ static const struct uart_ops uart_clps711x_ops = {
 };
 
 #ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
-static void uart_clps711x_console_putchar(struct uart_port *port, int ch)
+static void uart_clps711x_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct clps711x_port *s = dev_get_drvdata(port->dev);
 	u32 sysflg = 0;
diff --git a/drivers/tty/serial/digicolor-usart.c b/drivers/tty/serial/digicolor-usart.c
index 13ac36e2da4f..6d70fea76bb3 100644
--- a/drivers/tty/serial/digicolor-usart.c
+++ b/drivers/tty/serial/digicolor-usart.c
@@ -381,7 +381,7 @@ static const struct uart_ops digicolor_uart_ops = {
 	.request_port	= digicolor_uart_request_port,
 };
 
-static void digicolor_uart_console_putchar(struct uart_port *port, int ch)
+static void digicolor_uart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (digicolor_uart_tx_full(port))
 		cpu_relax();
diff --git a/drivers/tty/serial/dz.c b/drivers/tty/serial/dz.c
index e9edabc5a211..2e21acf39720 100644
--- a/drivers/tty/serial/dz.c
+++ b/drivers/tty/serial/dz.c
@@ -802,7 +802,7 @@ static void __init dz_init_ports(void)
  * restored.  Welcome to the world of PDP-11!
  * -------------------------------------------------------------------
  */
-static void dz_console_putchar(struct uart_port *uport, int ch)
+static void dz_console_putchar(struct uart_port *uport, unsigned char ch)
 {
 	struct dz_port *dport = to_dport(uport);
 	unsigned long flags;
diff --git a/drivers/tty/serial/earlycon-arm-semihost.c b/drivers/tty/serial/earlycon-arm-semihost.c
index fa096c10b591..fcdec5f42376 100644
--- a/drivers/tty/serial/earlycon-arm-semihost.c
+++ b/drivers/tty/serial/earlycon-arm-semihost.c
@@ -21,7 +21,7 @@
 /*
  * Semihosting-based debug console
  */
-static void smh_putc(struct uart_port *port, int c)
+static void smh_putc(struct uart_port *port, unsigned char c)
 {
 #ifdef CONFIG_ARM64
 	asm volatile("mov  x1, %0\n"
diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c
index ce81523c3113..27afb0b74ea7 100644
--- a/drivers/tty/serial/earlycon-riscv-sbi.c
+++ b/drivers/tty/serial/earlycon-riscv-sbi.c
@@ -10,7 +10,7 @@
 #include <linux/serial_core.h>
 #include <asm/sbi.h>
 
-static void sbi_putc(struct uart_port *port, int c)
+static void sbi_putc(struct uart_port *port, unsigned char c)
 {
 	sbi_console_putchar(c);
 }
diff --git a/drivers/tty/serial/fsl_linflexuart.c b/drivers/tty/serial/fsl_linflexuart.c
index 283757264608..98bb0c315e13 100644
--- a/drivers/tty/serial/fsl_linflexuart.c
+++ b/drivers/tty/serial/fsl_linflexuart.c
@@ -157,27 +157,29 @@ static void linflex_stop_rx(struct uart_port *port)
 	writel(ier & ~LINFLEXD_LINIER_DRIE, port->membase + LINIER);
 }
 
-static inline void linflex_transmit_buffer(struct uart_port *sport)
+static void linflex_put_char(struct uart_port *sport, unsigned char c)
 {
-	struct circ_buf *xmit = &sport->state->xmit;
-	unsigned char c;
 	unsigned long status;
 
-	while (!uart_circ_empty(xmit)) {
-		c = xmit->buf[xmit->tail];
-		writeb(c, sport->membase + BDRL);
+	writeb(c, sport->membase + BDRL);
 
-		/* Waiting for data transmission completed. */
-		while (((status = readl(sport->membase + UARTSR)) &
-					LINFLEXD_UARTSR_DTFTFF) !=
-					LINFLEXD_UARTSR_DTFTFF)
-			;
+	/* Waiting for data transmission completed. */
+	while (((status = readl(sport->membase + UARTSR)) &
+				LINFLEXD_UARTSR_DTFTFF) !=
+				LINFLEXD_UARTSR_DTFTFF)
+		;
+
+	writel(status | LINFLEXD_UARTSR_DTFTFF, sport->membase + UARTSR);
+}
+
+static inline void linflex_transmit_buffer(struct uart_port *sport)
+{
+	struct circ_buf *xmit = &sport->state->xmit;
 
+	while (!uart_circ_empty(xmit)) {
+		linflex_put_char(sport, xmit->buf[xmit->tail]);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 		sport->icount.tx++;
-
-		writel(status | LINFLEXD_UARTSR_DTFTFF,
-		       sport->membase + UARTSR);
 	}
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -201,21 +203,11 @@ static irqreturn_t linflex_txint(int irq, void *dev_id)
 	struct uart_port *sport = dev_id;
 	struct circ_buf *xmit = &sport->state->xmit;
 	unsigned long flags;
-	unsigned long status;
 
 	spin_lock_irqsave(&sport->lock, flags);
 
 	if (sport->x_char) {
-		writeb(sport->x_char, sport->membase + BDRL);
-
-		/* waiting for data transmission completed */
-		while (((status = readl(sport->membase + UARTSR)) &
-			LINFLEXD_UARTSR_DTFTFF) != LINFLEXD_UARTSR_DTFTFF)
-			;
-
-		writel(status | LINFLEXD_UARTSR_DTFTFF,
-		       sport->membase + UARTSR);
-
+		linflex_put_char(sport, sport->x_char);
 		goto out;
 	}
 
@@ -225,10 +217,6 @@ static irqreturn_t linflex_txint(int irq, void *dev_id)
 	}
 
 	linflex_transmit_buffer(sport);
-
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(sport);
-
 out:
 	spin_unlock_irqrestore(&sport->lock, flags);
 	return IRQ_HANDLED;
@@ -565,7 +553,7 @@ static const struct uart_ops linflex_pops = {
 static struct uart_port *linflex_ports[UART_NR];
 
 #ifdef CONFIG_SERIAL_FSL_LINFLEXUART_CONSOLE
-static void linflex_console_putchar(struct uart_port *port, int ch)
+static void linflex_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	unsigned long cr;
 
@@ -590,7 +578,7 @@ static void linflex_console_putchar(struct uart_port *port, int ch)
 	}
 }
 
-static void linflex_earlycon_putchar(struct uart_port *port, int ch)
+static void linflex_earlycon_putchar(struct uart_port *port, unsigned char ch)
 {
 	unsigned long flags;
 	char *ret;
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index ce3e26144689..87789872f400 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -931,7 +931,8 @@ static void lpuart_rxint(struct lpuart_port *sport)
 			sport->port.sysrq = 0;
 		}
 
-		tty_insert_flip_char(port, rx, flg);
+		if (tty_insert_flip_char(port, rx, flg) == 0)
+			sport->port.icount.buf_overrun++;
 	}
 
 out:
@@ -1024,7 +1025,8 @@ static void lpuart32_rxint(struct lpuart_port *sport)
 				flg = TTY_OVERRUN;
 		}
 
-		tty_insert_flip_char(port, rx, flg);
+		if (tty_insert_flip_char(port, rx, flg) == 0)
+			sport->port.icount.buf_overrun++;
 	}
 
 out:
@@ -1116,7 +1118,7 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
 	struct dma_chan *chan = sport->dma_rx_chan;
 	struct circ_buf *ring = &sport->rx_ring;
 	unsigned long flags;
-	int count = 0;
+	int count = 0, copied;
 
 	if (lpuart_is_32(sport)) {
 		unsigned long sr = lpuart32_read(&sport->port, UARTSTAT);
@@ -1218,20 +1220,24 @@ static void lpuart_copy_rx_to_tty(struct lpuart_port *sport)
 	if (ring->head < ring->tail) {
 		count = sport->rx_sgl.length - ring->tail;
 
-		tty_insert_flip_string(port, ring->buf + ring->tail, count);
+		copied = tty_insert_flip_string(port, ring->buf + ring->tail, count);
+		if (copied != count)
+			sport->port.icount.buf_overrun++;
 		ring->tail = 0;
-		sport->port.icount.rx += count;
+		sport->port.icount.rx += copied;
 	}
 
 	/* Finally we read data from tail to head */
 	if (ring->tail < ring->head) {
 		count = ring->head - ring->tail;
-		tty_insert_flip_string(port, ring->buf + ring->tail, count);
+		copied = tty_insert_flip_string(port, ring->buf + ring->tail, count);
+		if (copied != count)
+			sport->port.icount.buf_overrun++;
 		/* Wrap ring->head if needed */
 		if (ring->head >= sport->rx_sgl.length)
 			ring->head = 0;
 		ring->tail = ring->head;
-		sport->port.icount.rx += count;
+		sport->port.icount.rx += copied;
 	}
 
 exit:
@@ -2327,13 +2333,13 @@ static const struct uart_ops lpuart32_pops = {
 static struct lpuart_port *lpuart_ports[UART_NR];
 
 #ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE
-static void lpuart_console_putchar(struct uart_port *port, int ch)
+static void lpuart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	lpuart_wait_bit_set(port, UARTSR1, UARTSR1_TDRE);
 	writeb(ch, port->membase + UARTDR);
 }
 
-static void lpuart32_console_putchar(struct uart_port *port, int ch)
+static void lpuart32_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	lpuart32_wait_bit_set(port, UARTSTAT, UARTSTAT_TDRE);
 	lpuart32_write(port, ch, UARTDATA);
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index df8a0c8b8b29..fd38e6ed4fda 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -455,9 +455,14 @@ static void imx_uart_stop_tx(struct uart_port *port)
 	if (port->rs485.flags & SER_RS485_ENABLED) {
 		if (sport->tx_state == SEND) {
 			sport->tx_state = WAIT_AFTER_SEND;
-			start_hrtimer_ms(&sport->trigger_stop_tx,
+
+			if (port->rs485.delay_rts_after_send > 0) {
+				start_hrtimer_ms(&sport->trigger_stop_tx,
 					 port->rs485.delay_rts_after_send);
-			return;
+				return;
+			}
+
+			/* continue without any delay */
 		}
 
 		if (sport->tx_state == WAIT_AFTER_RTS ||
@@ -698,9 +703,14 @@ static void imx_uart_start_tx(struct uart_port *port)
 				imx_uart_stop_rx(port);
 
 			sport->tx_state = WAIT_AFTER_RTS;
-			start_hrtimer_ms(&sport->trigger_start_tx,
+
+			if (port->rs485.delay_rts_before_send > 0) {
+				start_hrtimer_ms(&sport->trigger_start_tx,
 					 port->rs485.delay_rts_before_send);
-			return;
+				return;
+			}
+
+			/* continue without any delay */
 		}
 
 		if (sport->tx_state == WAIT_AFTER_SEND
@@ -1258,7 +1268,7 @@ static void imx_uart_clear_rx_errors(struct imx_port *sport)
 }
 
 #define TXTL_DEFAULT 2 /* reset default */
-#define RXTL_DEFAULT 1 /* reset default */
+#define RXTL_DEFAULT 8 /* 8 characters or aging timer */
 #define TXTL_DMA 8 /* DMA burst setting */
 #define RXTL_DMA 9 /* DMA burst setting */
 
@@ -1958,7 +1968,7 @@ static const struct uart_ops imx_uart_pops = {
 static struct imx_port *imx_uart_ports[UART_NR];
 
 #if IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE)
-static void imx_uart_console_putchar(struct uart_port *port, int ch)
+static void imx_uart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct imx_port *sport = (struct imx_port *)port;
 
diff --git a/drivers/tty/serial/imx_earlycon.c b/drivers/tty/serial/imx_earlycon.c
index 795606e1a22f..7aab38b2bd8c 100644
--- a/drivers/tty/serial/imx_earlycon.c
+++ b/drivers/tty/serial/imx_earlycon.c
@@ -16,7 +16,7 @@
 #define UTS_TXFULL (1<<4) /* TxFIFO full */
 #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/
 
-static void imx_uart_console_early_putchar(struct uart_port *port, int ch)
+static void imx_uart_console_early_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (readl_relaxed(port->membase + IMX21_UTS) & UTS_TXFULL)
 		cpu_relax();
diff --git a/drivers/tty/serial/ip22zilog.c b/drivers/tty/serial/ip22zilog.c
index f4dc5fe4ba92..655e64b26852 100644
--- a/drivers/tty/serial/ip22zilog.c
+++ b/drivers/tty/serial/ip22zilog.c
@@ -990,7 +990,7 @@ static struct zilog_layout * __init get_zs(int chip)
 #define ZS_PUT_CHAR_MAX_DELAY	2000	/* 10 ms */
 
 #ifdef CONFIG_SERIAL_IP22_ZILOG_CONSOLE
-static void ip22zilog_put_char(struct uart_port *port, int ch)
+static void ip22zilog_put_char(struct uart_port *port, unsigned char ch)
 {
 	struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(port);
 	int loops = ZS_PUT_CHAR_MAX_DELAY;
diff --git a/drivers/tty/serial/jsm/jsm_cls.c b/drivers/tty/serial/jsm/jsm_cls.c
index b507a2cec926..444f233ebd1f 100644
--- a/drivers/tty/serial/jsm/jsm_cls.c
+++ b/drivers/tty/serial/jsm/jsm_cls.c
@@ -350,7 +350,7 @@ static void cls_assert_modem_signals(struct jsm_channel *ch)
 static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch)
 {
 	int qleft = 0;
-	u8 linestatus = 0;
+	u8 linestatus;
 	u8 error_mask = 0;
 	u16 head;
 	u16 tail;
@@ -365,8 +365,6 @@ static void cls_copy_data_from_uart_to_queue(struct jsm_channel *ch)
 	head = ch->ch_r_head & RQUEUEMASK;
 	tail = ch->ch_r_tail & RQUEUEMASK;
 
-	/* Get our cached LSR */
-	linestatus = ch->ch_cached_lsr;
 	ch->ch_cached_lsr = 0;
 
 	/* Store how much space we have left in the queue */
@@ -737,21 +735,7 @@ static void cls_param(struct jsm_channel *ch)
 	if (ch->ch_c_cflag & CSTOPB)
 		lcr |= UART_LCR_STOP;
 
-	switch (ch->ch_c_cflag & CSIZE) {
-	case CS5:
-		lcr |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		lcr |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		lcr |= UART_LCR_WLEN7;
-		break;
-	case CS8:
-	default:
-		lcr |= UART_LCR_WLEN8;
-		break;
-	}
+	lcr |= UART_LCR_WLEN(tty_get_char_size(ch->ch_c_cflag));
 
 	ier = readb(&ch->ch_cls_uart->ier);
 	uart_lcr = readb(&ch->ch_cls_uart->lcr);
diff --git a/drivers/tty/serial/jsm/jsm_neo.c b/drivers/tty/serial/jsm/jsm_neo.c
index c6f927a76c3b..110696cdaa1d 100644
--- a/drivers/tty/serial/jsm/jsm_neo.c
+++ b/drivers/tty/serial/jsm/jsm_neo.c
@@ -291,7 +291,8 @@ static void neo_copy_data_from_uart_to_queue(struct jsm_channel *ch)
 	ch->ch_cached_lsr = 0;
 
 	/* Store how much space we have left in the queue */
-	if ((qleft = tail - head - 1) < 0)
+	qleft = tail - head - 1;
+	if (qleft < 0)
 		qleft += RQUEUEMASK + 1;
 
 	/*
@@ -1008,21 +1009,7 @@ static void neo_param(struct jsm_channel *ch)
 	if (ch->ch_c_cflag & CSTOPB)
 		lcr |= UART_LCR_STOP;
 
-	switch (ch->ch_c_cflag & CSIZE) {
-	case CS5:
-		lcr |= UART_LCR_WLEN5;
-		break;
-	case CS6:
-		lcr |= UART_LCR_WLEN6;
-		break;
-	case CS7:
-		lcr |= UART_LCR_WLEN7;
-		break;
-	case CS8:
-	default:
-		lcr |= UART_LCR_WLEN8;
-	break;
-	}
+	lcr |= UART_LCR_WLEN(tty_get_char_size(ch->ch_c_cflag));
 
 	ier = readb(&ch->ch_neo_uart->ier);
 	uart_lcr = readb(&ch->ch_neo_uart->lcr);
diff --git a/drivers/tty/serial/jsm/jsm_tty.c b/drivers/tty/serial/jsm/jsm_tty.c
index d74cbbbf33c6..cb58bdec2f43 100644
--- a/drivers/tty/serial/jsm/jsm_tty.c
+++ b/drivers/tty/serial/jsm/jsm_tty.c
@@ -749,7 +749,8 @@ void jsm_check_queue_flow_control(struct jsm_channel *ch)
 	int qleft;
 
 	/* Store how much space we have left in the queue */
-	if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0)
+	qleft = ch->ch_r_tail - ch->ch_r_head - 1;
+	if (qleft < 0)
 		qleft += RQUEUEMASK + 1;
 
 	/*
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 49d0c7f2b29b..79b7db8580e0 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -403,16 +403,16 @@ static int kgdboc_option_setup(char *opt)
 {
 	if (!opt) {
 		pr_err("config string not provided\n");
-		return -EINVAL;
+		return 1;
 	}
 
 	if (strlen(opt) >= MAX_CONFIG_LEN) {
 		pr_err("config string too long\n");
-		return -ENOSPC;
+		return 1;
 	}
 	strcpy(config, opt);
 
-	return 0;
+	return 1;
 }
 
 __setup("kgdboc=", kgdboc_option_setup);
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 3e324d3f0a6d..a3120c3347dd 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -598,7 +598,7 @@ static const struct uart_ops lqasc_pops = {
 
 #ifdef CONFIG_SERIAL_LANTIQ_CONSOLE
 static void
-lqasc_console_putchar(struct uart_port *port, int ch)
+lqasc_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	int fifofree;
 
diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c
index 7f74bf7bdcff..328b50521f14 100644
--- a/drivers/tty/serial/liteuart.c
+++ b/drivers/tty/serial/liteuart.c
@@ -93,7 +93,7 @@ static void liteuart_timer(struct timer_list *t)
 	mod_timer(&uart->timer, jiffies + uart_poll_timeout(port));
 }
 
-static void liteuart_putchar(struct uart_port *port, int ch)
+static void liteuart_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (litex_read8(port->membase + OFF_TXFULL))
 		cpu_relax();
diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index 07c4161eb4cc..93140cac1ca1 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -122,7 +122,7 @@ static void wait_for_xmit_ready(struct uart_port *port)
 	}
 }
 
-static void lpc32xx_hsuart_console_putchar(struct uart_port *port, int ch)
+static void lpc32xx_hsuart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	wait_for_xmit_ready(port);
 	writel((u32)ch, LPC32XX_HSUART_FIFO(port->membase));
@@ -276,10 +276,11 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 	tty_flip_buffer_push(tport);
 }
 
+static void serial_lpc32xx_stop_tx(struct uart_port *port);
+
 static void __serial_lpc32xx_tx(struct uart_port *port)
 {
 	struct circ_buf *xmit = &port->state->xmit;
-	unsigned int tmp;
 
 	if (port->x_char) {
 		writel((u32)port->x_char, LPC32XX_HSUART_FIFO(port->membase));
@@ -306,11 +307,8 @@ static void __serial_lpc32xx_tx(struct uart_port *port)
 		uart_write_wakeup(port);
 
 exit_tx:
-	if (uart_circ_empty(xmit)) {
-		tmp = readl(LPC32XX_HSUART_CTRL(port->membase));
-		tmp &= ~LPC32XX_HSU_TX_INT_EN;
-		writel(tmp, LPC32XX_HSUART_CTRL(port->membase));
-	}
+	if (uart_circ_empty(xmit))
+		serial_lpc32xx_stop_tx(port);
 }
 
 static irqreturn_t serial_lpc32xx_interrupt(int irq, void *dev_id)
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index 516cff362434..0b5f21fbb53d 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -554,7 +554,6 @@ static void max3100_shutdown(struct uart_port *port)
 		del_timer_sync(&s->timer);
 
 	if (s->workqueue) {
-		flush_workqueue(s->workqueue);
 		destroy_workqueue(s->workqueue);
 		s->workqueue = NULL;
 	}
diff --git a/drivers/tty/serial/mcf.c b/drivers/tty/serial/mcf.c
index c7cec7d03620..2aec62b5d6c4 100644
--- a/drivers/tty/serial/mcf.c
+++ b/drivers/tty/serial/mcf.c
@@ -338,7 +338,7 @@ static void mcf_tx_chars(struct mcf_uart *pp)
 	}
 
 	while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
-		if (xmit->head == xmit->tail)
+		if (uart_circ_empty(xmit))
 			break;
 		writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
@@ -348,9 +348,8 @@ static void mcf_tx_chars(struct mcf_uart *pp)
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
 
-	if (xmit->head == xmit->tail) {
-		pp->imr &= ~MCFUART_UIR_TXREADY;
-		writeb(pp->imr, port->membase + MCFUART_UIMR);
+	if (uart_circ_empty(xmit)) {
+		mcf_stop_tx(port);
 		/* Disable TX to negate RTS automatically */
 		if (port->rs485.flags & SER_RS485_ENABLED)
 			writeb(MCFUART_UCR_TXDISABLE,
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index 45e00d928253..2bf1c57e0981 100644
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -513,7 +513,7 @@ static void meson_uart_enable_tx_engine(struct uart_port *port)
 	writel(val, port->membase + AML_UART_CONTROL);
 }
 
-static void meson_console_putchar(struct uart_port *port, int ch)
+static void meson_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	if (!port->membase)
 		return;
diff --git a/drivers/tty/serial/milbeaut_usio.c b/drivers/tty/serial/milbeaut_usio.c
index 8f2cab7f66ad..347088bb380e 100644
--- a/drivers/tty/serial/milbeaut_usio.c
+++ b/drivers/tty/serial/milbeaut_usio.c
@@ -400,7 +400,7 @@ static const struct uart_ops mlb_usio_ops = {
 
 #ifdef CONFIG_SERIAL_MILBEAUT_USIO_CONSOLE
 
-static void mlb_usio_console_putchar(struct uart_port *port, int c)
+static void mlb_usio_console_putchar(struct uart_port *port, unsigned char c)
 {
 	while (!(readb(port->membase + MLB_USIO_REG_SSR) & MLB_USIO_SSR_TDRE))
 		cpu_relax();
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index 2704dc988e4a..8a6958377764 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -83,11 +83,11 @@ static irqreturn_t mpc5xxx_uart_process_int(struct uart_port *port);
 
 struct psc_ops {
 	void		(*fifo_init)(struct uart_port *port);
-	int		(*raw_rx_rdy)(struct uart_port *port);
-	int		(*raw_tx_rdy)(struct uart_port *port);
-	int		(*rx_rdy)(struct uart_port *port);
-	int		(*tx_rdy)(struct uart_port *port);
-	int		(*tx_empty)(struct uart_port *port);
+	unsigned int	(*raw_rx_rdy)(struct uart_port *port);
+	unsigned int	(*raw_tx_rdy)(struct uart_port *port);
+	unsigned int	(*rx_rdy)(struct uart_port *port);
+	unsigned int	(*tx_rdy)(struct uart_port *port);
+	unsigned int	(*tx_empty)(struct uart_port *port);
 	void		(*stop_rx)(struct uart_port *port);
 	void		(*start_tx)(struct uart_port *port);
 	void		(*stop_tx)(struct uart_port *port);
@@ -203,34 +203,34 @@ static void mpc52xx_psc_fifo_init(struct uart_port *port)
 	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
 }
 
-static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_status)
 	    & MPC52xx_PSC_SR_RXRDY;
 }
 
-static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_status)
 	    & MPC52xx_PSC_SR_TXRDY;
 }
 
 
-static int mpc52xx_psc_rx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_rx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_isr)
 	    & port->read_status_mask
 	    & MPC52xx_PSC_IMR_RXRDY;
 }
 
-static int mpc52xx_psc_tx_rdy(struct uart_port *port)
+static unsigned int mpc52xx_psc_tx_rdy(struct uart_port *port)
 {
 	return in_be16(&PSC(port)->mpc52xx_psc_isr)
 	    & port->read_status_mask
 	    & MPC52xx_PSC_IMR_TXRDY;
 }
 
-static int mpc52xx_psc_tx_empty(struct uart_port *port)
+static unsigned int mpc52xx_psc_tx_empty(struct uart_port *port)
 {
 	u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status);
 
@@ -1365,7 +1365,7 @@ static const struct uart_ops mpc52xx_uart_ops = {
 /* Interrupt handling                                                       */
 /* ======================================================================== */
 
-static inline int
+static inline unsigned int
 mpc52xx_uart_int_rx_chars(struct uart_port *port)
 {
 	struct tty_port *tport = &port->state->port;
diff --git a/drivers/tty/serial/mps2-uart.c b/drivers/tty/serial/mps2-uart.c
index 587b42f754cb..5e9429dcc51f 100644
--- a/drivers/tty/serial/mps2-uart.c
+++ b/drivers/tty/serial/mps2-uart.c
@@ -432,7 +432,7 @@ static const struct uart_ops mps2_uart_pops = {
 static DEFINE_IDR(ports_idr);
 
 #ifdef CONFIG_SERIAL_MPS2_UART_CONSOLE
-static void mps2_uart_console_putchar(struct uart_port *port, int ch)
+static void mps2_uart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (mps2_uart_read8(port, UARTn_STATE) & UARTn_STATE_TX_FULL)
 		cpu_relax();
@@ -484,7 +484,7 @@ static struct console mps2_uart_console = {
 
 #define MPS2_SERIAL_CONSOLE (&mps2_uart_console)
 
-static void mps2_early_putchar(struct uart_port *port, int ch)
+static void mps2_early_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (readb(port->membase + UARTn_STATE) & UARTn_STATE_TX_FULL)
 		cpu_relax();
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index ab226da75f7b..0429c2a54290 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -8,12 +8,14 @@
 */
 
 #include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/math64.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
@@ -68,12 +70,36 @@
 #define  STAT_BRK_ERR		(STAT_BRK_DET | STAT_FRM_ERR \
 				 | STAT_PAR_ERR | STAT_OVR_ERR)
 
+/*
+ * Marvell Armada 3700 Functional Specifications describes that bit 21 of UART
+ * Clock Control register controls UART1 and bit 20 controls UART2. But in
+ * reality bit 21 controls UART2 and bit 20 controls UART1. This seems to be an
+ * error in Marvell's documentation. Hence following CLK_DIS macros are swapped.
+ */
+
 #define UART_BRDV		0x10
+/* These bits are located in UART1 address space and control UART2 */
+#define  UART2_CLK_DIS		BIT(21)
+/* These bits are located in UART1 address space and control UART1 */
+#define  UART1_CLK_DIS		BIT(20)
+/* These bits are located in UART1 address space and control both UARTs */
+#define  CLK_NO_XTAL		BIT(19)
+#define  CLK_TBG_DIV1_SHIFT	15
+#define  CLK_TBG_DIV1_MASK	0x7
+#define  CLK_TBG_DIV1_MAX	6
+#define  CLK_TBG_DIV2_SHIFT	12
+#define  CLK_TBG_DIV2_MASK	0x7
+#define  CLK_TBG_DIV2_MAX	6
+#define  CLK_TBG_SEL_SHIFT	10
+#define  CLK_TBG_SEL_MASK	0x3
+/* These bits are located in both UARTs address space */
 #define  BRDV_BAUD_MASK         0x3FF
+#define  BRDV_BAUD_MAX		BRDV_BAUD_MASK
 
 #define UART_OSAMP		0x14
 #define  OSAMP_DEFAULT_DIVISOR	16
 #define  OSAMP_DIVISORS_MASK	0x3F3F3F3F
+#define  OSAMP_MAX_DIVISOR	63
 
 #define MVEBU_NR_UARTS		2
 
@@ -153,6 +179,8 @@ static struct mvebu_uart *to_mvuart(struct uart_port *port)
 
 static struct uart_port mvebu_uart_ports[MVEBU_NR_UARTS];
 
+static DEFINE_SPINLOCK(mvebu_uart_lock);
+
 /* Core UART Driver Operations */
 static unsigned int mvebu_uart_tx_empty(struct uart_port *port)
 {
@@ -445,31 +473,79 @@ static void mvebu_uart_shutdown(struct uart_port *port)
 static int mvebu_uart_baud_rate_set(struct uart_port *port, unsigned int baud)
 {
 	unsigned int d_divisor, m_divisor;
+	unsigned long flags;
 	u32 brdv, osamp;
 
 	if (!port->uartclk)
 		return -EOPNOTSUPP;
 
 	/*
-	 * The baudrate is derived from the UART clock thanks to two divisors:
-	 *   > D ("baud generator"): can divide the clock from 2 to 2^10 - 1.
-	 *   > M ("fractional divisor"): allows a better accuracy for
-	 *     baudrates higher than 230400.
+	 * The baudrate is derived from the UART clock thanks to divisors:
+	 *   > d1 * d2 ("TBG divisors"): can divide only TBG clock from 1 to 6
+	 *   > D ("baud generator"): can divide the clock from 1 to 1023
+	 *   > M ("fractional divisor"): allows a better accuracy (from 1 to 63)
+	 *
+	 * Exact formulas for calculating baudrate:
+	 *
+	 * with default x16 scheme:
+	 *   baudrate = xtal / (d * 16)
+	 *   baudrate = tbg / (d1 * d2 * d * 16)
+	 *
+	 * with fractional divisor:
+	 *   baudrate = 10 * xtal / (d * (3 * (m1 + m2) + 2 * (m3 + m4)))
+	 *   baudrate = 10 * tbg / (d1*d2 * d * (3 * (m1 + m2) + 2 * (m3 + m4)))
+	 *
+	 * Oversampling value:
+	 *   osamp = (m1 << 0) | (m2 << 8) | (m3 << 16) | (m4 << 24);
+	 *
+	 * Where m1 controls number of clock cycles per bit for bits 1,2,3;
+	 * m2 for bits 4,5,6; m3 for bits 7,8 and m4 for bits 9,10.
+	 *
+	 * To simplify baudrate setup set all the M prescalers to the same
+	 * value. For baudrates 9600 Bd and higher, it is enough to use the
+	 * default (x16) divisor or fractional divisor with M = 63, so there
+	 * is no need to use real fractional support (where the M prescalers
+	 * are not equal).
+	 *
+	 * When all the M prescalers are zeroed then default (x16) divisor is
+	 * used. Default x16 scheme is more stable than M (fractional divisor),
+	 * so use M only when D divisor is not enough to derive baudrate.
 	 *
-	 * As the derivation of M is rather complicated, the code sticks to its
-	 * default value (x16) when all the prescalers are zeroed, and only
-	 * makes use of D to configure the desired baudrate.
+	 * Member port->uartclk is either xtal clock rate or TBG clock rate
+	 * divided by (d1 * d2). So d1 and d2 are already set by the UART clock
+	 * driver (and UART driver itself cannot change them). Moreover they are
+	 * shared between both UARTs.
 	 */
+
 	m_divisor = OSAMP_DEFAULT_DIVISOR;
 	d_divisor = DIV_ROUND_CLOSEST(port->uartclk, baud * m_divisor);
 
+	if (d_divisor > BRDV_BAUD_MAX) {
+		/*
+		 * Experiments show that small M divisors are unstable.
+		 * Use maximal possible M = 63 and calculate D divisor.
+		 */
+		m_divisor = OSAMP_MAX_DIVISOR;
+		d_divisor = DIV_ROUND_CLOSEST(port->uartclk, baud * m_divisor);
+	}
+
+	if (d_divisor < 1)
+		d_divisor = 1;
+	else if (d_divisor > BRDV_BAUD_MAX)
+		d_divisor = BRDV_BAUD_MAX;
+
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
 	brdv = readl(port->membase + UART_BRDV);
 	brdv &= ~BRDV_BAUD_MASK;
 	brdv |= d_divisor;
 	writel(brdv, port->membase + UART_BRDV);
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
 
 	osamp = readl(port->membase + UART_OSAMP);
 	osamp &= ~OSAMP_DIVISORS_MASK;
+	if (m_divisor != OSAMP_DEFAULT_DIVISOR)
+		osamp |= (m_divisor << 0) | (m_divisor << 8) |
+			(m_divisor << 16) | (m_divisor << 24);
 	writel(osamp, port->membase + UART_OSAMP);
 
 	return 0;
@@ -499,14 +575,16 @@ static void mvebu_uart_set_termios(struct uart_port *port,
 		port->ignore_status_mask |= STAT_RX_RDY(port) | STAT_BRK_ERR;
 
 	/*
-	 * Maximal divisor is 1023 * 16 when using default (x16) scheme.
-	 * Maximum achievable frequency with simple baudrate divisor is 230400.
-	 * Since the error per bit frame would be of more than 15%, achieving
-	 * higher frequencies would require to implement the fractional divisor
-	 * feature.
+	 * Maximal divisor is 1023 and maximal fractional divisor is 63. And
+	 * experiments show that baudrates above 1/80 of parent clock rate are
+	 * not stable. So disallow baudrates above 1/80 of the parent clock
+	 * rate. If port->uartclk is not available, then
+	 * mvebu_uart_baud_rate_set() fails, so values min_baud and max_baud
+	 * in this case do not matter.
 	 */
-	min_baud = DIV_ROUND_UP(port->uartclk, 1023 * 16);
-	max_baud = 230400;
+	min_baud = DIV_ROUND_UP(port->uartclk, BRDV_BAUD_MAX *
+				OSAMP_MAX_DIVISOR);
+	max_baud = port->uartclk / 80;
 
 	baud = uart_get_baud_rate(port, termios, old, min_baud, max_baud);
 	if (mvebu_uart_baud_rate_set(port, baud)) {
@@ -598,7 +676,7 @@ static const struct uart_ops mvebu_uart_ops = {
 
 #ifdef CONFIG_SERIAL_MVEBU_CONSOLE
 /* Early Console */
-static void mvebu_uart_putc(struct uart_port *port, int c)
+static void mvebu_uart_putc(struct uart_port *port, unsigned char c)
 {
 	unsigned int st;
 
@@ -659,7 +737,7 @@ static void wait_for_xmite(struct uart_port *port)
 				  (val & STAT_TX_EMP), 1, 10000);
 }
 
-static void mvebu_uart_console_putchar(struct uart_port *port, int ch)
+static void mvebu_uart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	wait_for_xmitr(port);
 	writel(ch, port->membase + UART_TSH(port));
@@ -762,6 +840,7 @@ static int mvebu_uart_suspend(struct device *dev)
 {
 	struct mvebu_uart *mvuart = dev_get_drvdata(dev);
 	struct uart_port *port = mvuart->port;
+	unsigned long flags;
 
 	uart_suspend_port(&mvebu_uart_driver, port);
 
@@ -770,7 +849,9 @@ static int mvebu_uart_suspend(struct device *dev)
 	mvuart->pm_regs.ctrl = readl(port->membase + UART_CTRL(port));
 	mvuart->pm_regs.intr = readl(port->membase + UART_INTR(port));
 	mvuart->pm_regs.stat = readl(port->membase + UART_STAT);
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
 	mvuart->pm_regs.brdv = readl(port->membase + UART_BRDV);
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
 	mvuart->pm_regs.osamp = readl(port->membase + UART_OSAMP);
 
 	device_set_wakeup_enable(dev, true);
@@ -782,13 +863,16 @@ static int mvebu_uart_resume(struct device *dev)
 {
 	struct mvebu_uart *mvuart = dev_get_drvdata(dev);
 	struct uart_port *port = mvuart->port;
+	unsigned long flags;
 
 	writel(mvuart->pm_regs.rbr, port->membase + UART_RBR(port));
 	writel(mvuart->pm_regs.tsh, port->membase + UART_TSH(port));
 	writel(mvuart->pm_regs.ctrl, port->membase + UART_CTRL(port));
 	writel(mvuart->pm_regs.intr, port->membase + UART_INTR(port));
 	writel(mvuart->pm_regs.stat, port->membase + UART_STAT);
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
 	writel(mvuart->pm_regs.brdv, port->membase + UART_BRDV);
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
 	writel(mvuart->pm_regs.osamp, port->membase + UART_OSAMP);
 
 	uart_resume_port(&mvebu_uart_driver, port);
@@ -972,6 +1056,477 @@ static struct platform_driver mvebu_uart_platform_driver = {
 	},
 };
 
+/* This code is based on clk-fixed-factor.c driver and modified. */
+
+struct mvebu_uart_clock {
+	struct clk_hw clk_hw;
+	int clock_idx;
+	u32 pm_context_reg1;
+	u32 pm_context_reg2;
+};
+
+struct mvebu_uart_clock_base {
+	struct mvebu_uart_clock clocks[2];
+	unsigned int parent_rates[5];
+	int parent_idx;
+	unsigned int div;
+	void __iomem *reg1;
+	void __iomem *reg2;
+	bool configured;
+};
+
+#define PARENT_CLOCK_XTAL 4
+
+#define to_uart_clock(hw) container_of(hw, struct mvebu_uart_clock, clk_hw)
+#define to_uart_clock_base(uart_clock) container_of(uart_clock, \
+	struct mvebu_uart_clock_base, clocks[uart_clock->clock_idx])
+
+static int mvebu_uart_clock_prepare(struct clk_hw *hw)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+	unsigned int prev_clock_idx, prev_clock_rate, prev_d1d2;
+	unsigned int parent_clock_idx, parent_clock_rate;
+	unsigned long flags;
+	unsigned int d1, d2;
+	u64 divisor;
+	u32 val;
+
+	/*
+	 * This function just reconfigures UART Clock Control register (located
+	 * in UART1 address space which controls both UART1 and UART2) to
+	 * selected UART base clock and recalculates current UART1/UART2
+	 * divisors in their address spaces, so that final baudrate will not be
+	 * changed by switching UART parent clock. This is required for
+	 * otherwise kernel's boot log stops working - we need to ensure that
+	 * UART baudrate does not change during this setup. It is a one time
+	 * operation, it will execute only once and set `configured` to true,
+	 * and be skipped on subsequent calls. Because this UART Clock Control
+	 * register (UART_BRDV) is shared between UART1 baudrate function,
+	 * UART1 clock selector and UART2 clock selector, every access to
+	 * UART_BRDV (reg1) needs to be protected by a lock.
+	 */
+
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
+
+	if (uart_clock_base->configured) {
+		spin_unlock_irqrestore(&mvebu_uart_lock, flags);
+		return 0;
+	}
+
+	parent_clock_idx = uart_clock_base->parent_idx;
+	parent_clock_rate = uart_clock_base->parent_rates[parent_clock_idx];
+
+	val = readl(uart_clock_base->reg1);
+
+	if (uart_clock_base->div > CLK_TBG_DIV1_MAX) {
+		d1 = CLK_TBG_DIV1_MAX;
+		d2 = uart_clock_base->div / CLK_TBG_DIV1_MAX;
+	} else {
+		d1 = uart_clock_base->div;
+		d2 = 1;
+	}
+
+	if (val & CLK_NO_XTAL) {
+		prev_clock_idx = (val >> CLK_TBG_SEL_SHIFT) & CLK_TBG_SEL_MASK;
+		prev_d1d2 = ((val >> CLK_TBG_DIV1_SHIFT) & CLK_TBG_DIV1_MASK) *
+			    ((val >> CLK_TBG_DIV2_SHIFT) & CLK_TBG_DIV2_MASK);
+	} else {
+		prev_clock_idx = PARENT_CLOCK_XTAL;
+		prev_d1d2 = 1;
+	}
+
+	/* Note that uart_clock_base->parent_rates[i] may not be available */
+	prev_clock_rate = uart_clock_base->parent_rates[prev_clock_idx];
+
+	/* Recalculate UART1 divisor so UART1 baudrate does not change */
+	if (prev_clock_rate) {
+		divisor = DIV_U64_ROUND_CLOSEST((u64)(val & BRDV_BAUD_MASK) *
+						parent_clock_rate * prev_d1d2,
+						prev_clock_rate * d1 * d2);
+		if (divisor < 1)
+			divisor = 1;
+		else if (divisor > BRDV_BAUD_MAX)
+			divisor = BRDV_BAUD_MAX;
+		val = (val & ~BRDV_BAUD_MASK) | divisor;
+	}
+
+	if (parent_clock_idx != PARENT_CLOCK_XTAL) {
+		/* Do not use XTAL, select TBG clock and TBG d1 * d2 divisors */
+		val |= CLK_NO_XTAL;
+		val &= ~(CLK_TBG_DIV1_MASK << CLK_TBG_DIV1_SHIFT);
+		val |= d1 << CLK_TBG_DIV1_SHIFT;
+		val &= ~(CLK_TBG_DIV2_MASK << CLK_TBG_DIV2_SHIFT);
+		val |= d2 << CLK_TBG_DIV2_SHIFT;
+		val &= ~(CLK_TBG_SEL_MASK << CLK_TBG_SEL_SHIFT);
+		val |= parent_clock_idx << CLK_TBG_SEL_SHIFT;
+	} else {
+		/* Use XTAL, TBG bits are then ignored */
+		val &= ~CLK_NO_XTAL;
+	}
+
+	writel(val, uart_clock_base->reg1);
+
+	/* Recalculate UART2 divisor so UART2 baudrate does not change */
+	if (prev_clock_rate) {
+		val = readl(uart_clock_base->reg2);
+		divisor = DIV_U64_ROUND_CLOSEST((u64)(val & BRDV_BAUD_MASK) *
+						parent_clock_rate * prev_d1d2,
+						prev_clock_rate * d1 * d2);
+		if (divisor < 1)
+			divisor = 1;
+		else if (divisor > BRDV_BAUD_MAX)
+			divisor = BRDV_BAUD_MAX;
+		val = (val & ~BRDV_BAUD_MASK) | divisor;
+		writel(val, uart_clock_base->reg2);
+	}
+
+	uart_clock_base->configured = true;
+
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
+
+	return 0;
+}
+
+static int mvebu_uart_clock_enable(struct clk_hw *hw)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
+
+	val = readl(uart_clock_base->reg1);
+
+	if (uart_clock->clock_idx == 0)
+		val &= ~UART1_CLK_DIS;
+	else
+		val &= ~UART2_CLK_DIS;
+
+	writel(val, uart_clock_base->reg1);
+
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
+
+	return 0;
+}
+
+static void mvebu_uart_clock_disable(struct clk_hw *hw)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+	unsigned long flags;
+	u32 val;
+
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
+
+	val = readl(uart_clock_base->reg1);
+
+	if (uart_clock->clock_idx == 0)
+		val |= UART1_CLK_DIS;
+	else
+		val |= UART2_CLK_DIS;
+
+	writel(val, uart_clock_base->reg1);
+
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
+}
+
+static int mvebu_uart_clock_is_enabled(struct clk_hw *hw)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+	u32 val;
+
+	val = readl(uart_clock_base->reg1);
+
+	if (uart_clock->clock_idx == 0)
+		return !(val & UART1_CLK_DIS);
+	else
+		return !(val & UART2_CLK_DIS);
+}
+
+static int mvebu_uart_clock_save_context(struct clk_hw *hw)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
+	uart_clock->pm_context_reg1 = readl(uart_clock_base->reg1);
+	uart_clock->pm_context_reg2 = readl(uart_clock_base->reg2);
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
+
+	return 0;
+}
+
+static void mvebu_uart_clock_restore_context(struct clk_hw *hw)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mvebu_uart_lock, flags);
+	writel(uart_clock->pm_context_reg1, uart_clock_base->reg1);
+	writel(uart_clock->pm_context_reg2, uart_clock_base->reg2);
+	spin_unlock_irqrestore(&mvebu_uart_lock, flags);
+}
+
+static unsigned long mvebu_uart_clock_recalc_rate(struct clk_hw *hw,
+						  unsigned long parent_rate)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+
+	return parent_rate / uart_clock_base->div;
+}
+
+static long mvebu_uart_clock_round_rate(struct clk_hw *hw, unsigned long rate,
+					unsigned long *parent_rate)
+{
+	struct mvebu_uart_clock *uart_clock = to_uart_clock(hw);
+	struct mvebu_uart_clock_base *uart_clock_base =
+						to_uart_clock_base(uart_clock);
+
+	return *parent_rate / uart_clock_base->div;
+}
+
+static int mvebu_uart_clock_set_rate(struct clk_hw *hw, unsigned long rate,
+				     unsigned long parent_rate)
+{
+	/*
+	 * We must report success but we can do so unconditionally because
+	 * mvebu_uart_clock_round_rate returns values that ensure this call is a
+	 * nop.
+	 */
+
+	return 0;
+}
+
+static const struct clk_ops mvebu_uart_clock_ops = {
+	.prepare = mvebu_uart_clock_prepare,
+	.enable = mvebu_uart_clock_enable,
+	.disable = mvebu_uart_clock_disable,
+	.is_enabled = mvebu_uart_clock_is_enabled,
+	.save_context = mvebu_uart_clock_save_context,
+	.restore_context = mvebu_uart_clock_restore_context,
+	.round_rate = mvebu_uart_clock_round_rate,
+	.set_rate = mvebu_uart_clock_set_rate,
+	.recalc_rate = mvebu_uart_clock_recalc_rate,
+};
+
+static int mvebu_uart_clock_register(struct device *dev,
+				     struct mvebu_uart_clock *uart_clock,
+				     const char *name,
+				     const char *parent_name)
+{
+	struct clk_init_data init = { };
+
+	uart_clock->clk_hw.init = &init;
+
+	init.name = name;
+	init.ops = &mvebu_uart_clock_ops;
+	init.flags = 0;
+	init.num_parents = 1;
+	init.parent_names = &parent_name;
+
+	return devm_clk_hw_register(dev, &uart_clock->clk_hw);
+}
+
+static int mvebu_uart_clock_probe(struct platform_device *pdev)
+{
+	static const char *const uart_clk_names[] = { "uart_1", "uart_2" };
+	static const char *const parent_clk_names[] = { "TBG-A-P", "TBG-B-P",
+							"TBG-A-S", "TBG-B-S",
+							"xtal" };
+	struct clk *parent_clks[ARRAY_SIZE(parent_clk_names)];
+	struct mvebu_uart_clock_base *uart_clock_base;
+	struct clk_hw_onecell_data *hw_clk_data;
+	struct device *dev = &pdev->dev;
+	int i, parent_clk_idx, ret;
+	unsigned long div, rate;
+	struct resource *res;
+	unsigned int d1, d2;
+
+	BUILD_BUG_ON(ARRAY_SIZE(uart_clk_names) !=
+		     ARRAY_SIZE(uart_clock_base->clocks));
+	BUILD_BUG_ON(ARRAY_SIZE(parent_clk_names) !=
+		     ARRAY_SIZE(uart_clock_base->parent_rates));
+
+	uart_clock_base = devm_kzalloc(dev,
+				       sizeof(*uart_clock_base),
+				       GFP_KERNEL);
+	if (!uart_clock_base)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "Couldn't get first register\n");
+		return -ENOENT;
+	}
+
+	/*
+	 * UART Clock Control register (reg1 / UART_BRDV) is in the address
+	 * space of UART1 (standard UART variant), controls parent clock and
+	 * dividers for both UART1 and UART2 and is supplied via DT as the first
+	 * resource. Therefore use ioremap() rather than ioremap_resource() to
+	 * avoid conflicts with UART1 driver. Access to UART_BRDV is protected
+	 * by a lock shared between clock and UART driver.
+	 */
+	uart_clock_base->reg1 = devm_ioremap(dev, res->start,
+					     resource_size(res));
+	if (!uart_clock_base->reg1)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res) {
+		dev_err(dev, "Couldn't get second register\n");
+		return -ENOENT;
+	}
+
+	/*
+	 * UART 2 Baud Rate Divisor register (reg2 / UART_BRDV) is in address
+	 * space of UART2 (extended UART variant), controls only one UART2
+	 * specific divider and is supplied via DT as second resource.
+	 * Therefore use ioremap() rather than ioremap_resource() to avoid
+	 * conflicts with UART2 driver. Access to UART_BRDV is protected by a
+	 * by lock shared between clock and UART driver.
+	 */
+	uart_clock_base->reg2 = devm_ioremap(dev, res->start,
+					     resource_size(res));
+	if (!uart_clock_base->reg2)
+		return -ENOMEM;
+
+	hw_clk_data = devm_kzalloc(dev,
+				   struct_size(hw_clk_data, hws,
+					       ARRAY_SIZE(uart_clk_names)),
+				   GFP_KERNEL);
+	if (!hw_clk_data)
+		return -ENOMEM;
+
+	hw_clk_data->num = ARRAY_SIZE(uart_clk_names);
+	for (i = 0; i < ARRAY_SIZE(uart_clk_names); i++) {
+		hw_clk_data->hws[i] = &uart_clock_base->clocks[i].clk_hw;
+		uart_clock_base->clocks[i].clock_idx = i;
+	}
+
+	parent_clk_idx = -1;
+
+	for (i = 0; i < ARRAY_SIZE(parent_clk_names); i++) {
+		parent_clks[i] = devm_clk_get(dev, parent_clk_names[i]);
+		if (IS_ERR(parent_clks[i])) {
+			if (PTR_ERR(parent_clks[i]) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
+			dev_warn(dev, "Couldn't get the parent clock %s: %ld\n",
+				 parent_clk_names[i], PTR_ERR(parent_clks[i]));
+			continue;
+		}
+
+		ret = clk_prepare_enable(parent_clks[i]);
+		if (ret) {
+			dev_warn(dev, "Couldn't enable parent clock %s: %d\n",
+				 parent_clk_names[i], ret);
+			continue;
+		}
+		rate = clk_get_rate(parent_clks[i]);
+		uart_clock_base->parent_rates[i] = rate;
+
+		if (i != PARENT_CLOCK_XTAL) {
+			/*
+			 * Calculate the smallest TBG d1 and d2 divisors that
+			 * still can provide 9600 baudrate.
+			 */
+			d1 = DIV_ROUND_UP(rate, 9600 * OSAMP_MAX_DIVISOR *
+					  BRDV_BAUD_MAX);
+			if (d1 < 1)
+				d1 = 1;
+			else if (d1 > CLK_TBG_DIV1_MAX)
+				d1 = CLK_TBG_DIV1_MAX;
+
+			d2 = DIV_ROUND_UP(rate, 9600 * OSAMP_MAX_DIVISOR *
+					  BRDV_BAUD_MAX * d1);
+			if (d2 < 1)
+				d2 = 1;
+			else if (d2 > CLK_TBG_DIV2_MAX)
+				d2 = CLK_TBG_DIV2_MAX;
+		} else {
+			/*
+			 * When UART clock uses XTAL clock as a source then it
+			 * is not possible to use d1 and d2 divisors.
+			 */
+			d1 = d2 = 1;
+		}
+
+		/* Skip clock source which cannot provide 9600 baudrate */
+		if (rate > 9600 * OSAMP_MAX_DIVISOR * BRDV_BAUD_MAX * d1 * d2)
+			continue;
+
+		/*
+		 * Choose TBG clock source with the smallest divisors. Use XTAL
+		 * clock source only in case TBG is not available as XTAL cannot
+		 * be used for baudrates higher than 230400.
+		 */
+		if (parent_clk_idx == -1 ||
+		    (i != PARENT_CLOCK_XTAL && div > d1 * d2)) {
+			parent_clk_idx = i;
+			div = d1 * d2;
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(parent_clk_names); i++) {
+		if (i == parent_clk_idx || IS_ERR(parent_clks[i]))
+			continue;
+		clk_disable_unprepare(parent_clks[i]);
+		devm_clk_put(dev, parent_clks[i]);
+	}
+
+	if (parent_clk_idx == -1) {
+		dev_err(dev, "No usable parent clock\n");
+		return -ENOENT;
+	}
+
+	uart_clock_base->parent_idx = parent_clk_idx;
+	uart_clock_base->div = div;
+
+	dev_notice(dev, "Using parent clock %s as base UART clock\n",
+		   __clk_get_name(parent_clks[parent_clk_idx]));
+
+	for (i = 0; i < ARRAY_SIZE(uart_clk_names); i++) {
+		ret = mvebu_uart_clock_register(dev,
+				&uart_clock_base->clocks[i],
+				uart_clk_names[i],
+				__clk_get_name(parent_clks[parent_clk_idx]));
+		if (ret) {
+			dev_err(dev, "Can't register UART clock %d: %d\n",
+				i, ret);
+			return ret;
+		}
+	}
+
+	return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
+					   hw_clk_data);
+}
+
+static const struct of_device_id mvebu_uart_clock_of_match[] = {
+	{ .compatible = "marvell,armada-3700-uart-clock", },
+	{ }
+};
+
+static struct platform_driver mvebu_uart_clock_platform_driver = {
+	.probe = mvebu_uart_clock_probe,
+	.driver		= {
+		.name	= "mvebu-uart-clock",
+		.of_match_table = mvebu_uart_clock_of_match,
+	},
+};
+
 static int __init mvebu_uart_init(void)
 {
 	int ret;
@@ -980,10 +1535,19 @@ static int __init mvebu_uart_init(void)
 	if (ret)
 		return ret;
 
+	ret = platform_driver_register(&mvebu_uart_clock_platform_driver);
+	if (ret) {
+		uart_unregister_driver(&mvebu_uart_driver);
+		return ret;
+	}
+
 	ret = platform_driver_register(&mvebu_uart_platform_driver);
-	if (ret)
+	if (ret) {
+		platform_driver_unregister(&mvebu_uart_clock_platform_driver);
 		uart_unregister_driver(&mvebu_uart_driver);
+		return ret;
+	}
 
-	return ret;
+	return 0;
 }
 arch_initcall(mvebu_uart_init);
diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index ac45f3386e97..1944daf8593a 100644
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1305,7 +1305,7 @@ static const struct uart_ops mxs_auart_ops = {
 static struct mxs_auart_port *auart_port[MXS_AUART_PORTS];
 
 #ifdef CONFIG_SERIAL_MXS_AUART_CONSOLE
-static void mxs_auart_console_putchar(struct uart_port *port, int ch)
+static void mxs_auart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct mxs_auart_port *s = to_auart_port(port);
 	unsigned int to = 1000;
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 0862941862c8..8d5ffa196097 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -808,21 +808,7 @@ serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned long flags;
 	unsigned int baud, quot;
 
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
 
 	if (termios->c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;
@@ -1194,7 +1180,7 @@ static void omap_serial_early_out(struct uart_port *port, int offset,
 	writew(value, port->membase + offset);
 }
 
-static void omap_serial_early_putc(struct uart_port *port, int c)
+static void omap_serial_early_putc(struct uart_port *port, unsigned char c)
 {
 	unsigned int status;
 
@@ -1238,7 +1224,7 @@ static struct uart_omap_port *serial_omap_console_ports[OMAP_MAX_HSUART_PORTS];
 
 static struct uart_driver serial_omap_reg;
 
-static void serial_omap_console_putchar(struct uart_port *port, int ch)
+static void serial_omap_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct uart_omap_port *up = to_uart_omap_port(port);
 
diff --git a/drivers/tty/serial/owl-uart.c b/drivers/tty/serial/owl-uart.c
index 91f1eb0058d7..5250bd7d390a 100644
--- a/drivers/tty/serial/owl-uart.c
+++ b/drivers/tty/serial/owl-uart.c
@@ -516,7 +516,7 @@ static const struct uart_ops owl_uart_ops = {
 
 #ifdef CONFIG_SERIAL_OWL_CONSOLE
 
-static void owl_console_putchar(struct uart_port *port, int ch)
+static void owl_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	if (!port->membase)
 		return;
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index f0351e6f0ef6..affe71f8b50c 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1600,7 +1600,7 @@ static const struct uart_ops pch_uart_ops = {
 
 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
 
-static void pch_console_putchar(struct uart_port *port, int ch)
+static void pch_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct eg20t_port *priv =
 		container_of(port, struct eg20t_port, port);
diff --git a/drivers/tty/serial/pic32_uart.c b/drivers/tty/serial/pic32_uart.c
index 0a12fb11e698..b7a3a1b959b1 100644
--- a/drivers/tty/serial/pic32_uart.c
+++ b/drivers/tty/serial/pic32_uart.c
@@ -691,7 +691,7 @@ static const struct uart_ops pic32_uart_ops = {
 
 #ifdef CONFIG_SERIAL_PIC32_CONSOLE
 /* output given char */
-static void pic32_console_putchar(struct uart_port *port, int ch)
+static void pic32_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct pic32_sport *sport = to_pic32_sport(port);
 
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 5359236b32d6..5d97c201ad88 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -1944,7 +1944,7 @@ static void __exit exit_pmz(void)
 
 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 
-static void pmz_console_putchar(struct uart_port *port, int ch)
+static void pmz_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct uart_pmac_port *uap =
 		container_of(port, struct uart_pmac_port, port);
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 30b099746a75..e80ba8e10407 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -430,21 +430,7 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned int baud, quot;
 	unsigned int dll;
 
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		cval = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		cval = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		cval = UART_LCR_WLEN7;
-		break;
-	default:
-	case CS8:
-		cval = UART_LCR_WLEN8;
-		break;
-	}
+	cval = UART_LCR_WLEN(tty_get_char_size(termios->c_cflag));
 
 	if (termios->c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;
@@ -619,7 +605,7 @@ static void wait_for_xmitr(struct uart_pxa_port *up)
 	}
 }
 
-static void serial_pxa_console_putchar(struct uart_port *port, int ch)
+static void serial_pxa_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct uart_pxa_port *up = (struct uart_pxa_port *)port;
 
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index aedc38893e6c..1543a6028856 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -397,7 +397,7 @@ static void qcom_geni_serial_poll_put_char(struct uart_port *uport,
 #endif
 
 #ifdef CONFIG_SERIAL_QCOM_GENI_CONSOLE
-static void qcom_geni_serial_wr_char(struct uart_port *uport, int ch)
+static void qcom_geni_serial_wr_char(struct uart_port *uport, unsigned char ch)
 {
 	struct qcom_geni_private_data *private_data = uport->private_data;
 
diff --git a/drivers/tty/serial/rda-uart.c b/drivers/tty/serial/rda-uart.c
index d550d8fa2fab..e5f1fded423a 100644
--- a/drivers/tty/serial/rda-uart.c
+++ b/drivers/tty/serial/rda-uart.c
@@ -573,7 +573,7 @@ static const struct uart_ops rda_uart_ops = {
 
 #ifdef CONFIG_SERIAL_RDA_CONSOLE
 
-static void rda_console_putchar(struct uart_port *port, int ch)
+static void rda_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	if (!port->membase)
 		return;
diff --git a/drivers/tty/serial/sa1100.c b/drivers/tty/serial/sa1100.c
index 697b6a002a16..5fe6cccfc1ae 100644
--- a/drivers/tty/serial/sa1100.c
+++ b/drivers/tty/serial/sa1100.c
@@ -695,7 +695,7 @@ void __init sa1100_register_uart(int idx, int port)
 
 
 #ifdef CONFIG_SERIAL_SA1100_CONSOLE
-static void sa1100_console_putchar(struct uart_port *port, int ch)
+static void sa1100_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct sa1100_port *sport =
 		container_of(port, struct sa1100_port, port);
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index d002a4e48ed9..e1585fbae909 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -63,7 +63,7 @@ enum s3c24xx_port_type {
 };
 
 struct s3c24xx_uart_info {
-	char			*name;
+	const char		*name;
 	enum s3c24xx_port_type	type;
 	unsigned int		port_type;
 	unsigned int		fifosize;
@@ -85,9 +85,9 @@ struct s3c24xx_uart_info {
 };
 
 struct s3c24xx_serial_drv_data {
-	struct s3c24xx_uart_info	*info;
-	struct s3c2410_uartcfg		*def_cfg;
-	unsigned int			fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
+	const struct s3c24xx_uart_info	info;
+	const struct s3c2410_uartcfg	def_cfg;
+	const unsigned int		fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
 };
 
 struct s3c24xx_uart_dma {
@@ -136,14 +136,14 @@ struct s3c24xx_uart_port {
 	unsigned int			tx_mode;
 	unsigned int			rx_mode;
 
-	struct s3c24xx_uart_info	*info;
+	const struct s3c24xx_uart_info	*info;
 	struct clk			*clk;
 	struct clk			*baudclk;
 	struct uart_port		port;
-	struct s3c24xx_serial_drv_data	*drv_data;
+	const struct s3c24xx_serial_drv_data	*drv_data;
 
 	/* reference to platform data */
-	struct s3c2410_uartcfg		*cfg;
+	const struct s3c2410_uartcfg	*cfg;
 
 	struct s3c24xx_uart_dma		*dma;
 
@@ -164,7 +164,7 @@ static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport);
 #define portaddrl(port, reg) \
 	((unsigned long *)(unsigned long)((port)->membase + (reg)))
 
-static u32 rd_reg(struct uart_port *port, u32 reg)
+static u32 rd_reg(const struct uart_port *port, u32 reg)
 {
 	switch (port->iotype) {
 	case UPIO_MEM:
@@ -179,7 +179,7 @@ static u32 rd_reg(struct uart_port *port, u32 reg)
 
 #define rd_regl(port, reg) (readl_relaxed(portaddr(port, reg)))
 
-static void wr_reg(struct uart_port *port, u32 reg, u32 val)
+static void wr_reg(const struct uart_port *port, u32 reg, u32 val)
 {
 	switch (port->iotype) {
 	case UPIO_MEM:
@@ -195,7 +195,7 @@ static void wr_reg(struct uart_port *port, u32 reg, u32 val)
 
 /* Byte-order aware bit setting/clearing functions. */
 
-static inline void s3c24xx_set_bit(struct uart_port *port, int idx,
+static inline void s3c24xx_set_bit(const struct uart_port *port, int idx,
 				   unsigned int reg)
 {
 	unsigned long flags;
@@ -208,7 +208,7 @@ static inline void s3c24xx_set_bit(struct uart_port *port, int idx,
 	local_irq_restore(flags);
 }
 
-static inline void s3c24xx_clear_bit(struct uart_port *port, int idx,
+static inline void s3c24xx_clear_bit(const struct uart_port *port, int idx,
 				     unsigned int reg)
 {
 	unsigned long flags;
@@ -228,12 +228,12 @@ static inline struct s3c24xx_uart_port *to_ourport(struct uart_port *port)
 
 /* translate a port to the device name */
 
-static inline const char *s3c24xx_serial_portname(struct uart_port *port)
+static inline const char *s3c24xx_serial_portname(const struct uart_port *port)
 {
 	return to_platform_device(port->dev)->name;
 }
 
-static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
+static int s3c24xx_serial_txempty_nofifo(const struct uart_port *port)
 {
 	return rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE;
 }
@@ -358,7 +358,7 @@ static void s3c24xx_serial_tx_dma_complete(void *args)
 
 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
 {
-	struct uart_port *port = &ourport->port;
+	const struct uart_port *port = &ourport->port;
 	u32 ucon;
 
 	/* Mask Tx interrupt */
@@ -387,7 +387,7 @@ static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
 
 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
 {
-	struct uart_port *port = &ourport->port;
+	const struct uart_port *port = &ourport->port;
 	u32 ucon, ufcon;
 
 	/* Set ufcon txtrig */
@@ -573,16 +573,16 @@ static void s3c24xx_serial_stop_rx(struct uart_port *port)
 	}
 }
 
-static inline struct s3c24xx_uart_info
+static inline const struct s3c24xx_uart_info
 	*s3c24xx_port_to_info(struct uart_port *port)
 {
 	return to_ourport(port)->info;
 }
 
-static inline struct s3c2410_uartcfg
-	*s3c24xx_port_to_cfg(struct uart_port *port)
+static inline const struct s3c2410_uartcfg
+	*s3c24xx_port_to_cfg(const struct uart_port *port)
 {
-	struct s3c24xx_uart_port *ourport;
+	const struct s3c24xx_uart_port *ourport;
 
 	if (port->dev == NULL)
 		return NULL;
@@ -591,10 +591,10 @@ static inline struct s3c2410_uartcfg
 	return ourport->cfg;
 }
 
-static int s3c24xx_serial_rx_fifocnt(struct s3c24xx_uart_port *ourport,
+static int s3c24xx_serial_rx_fifocnt(const struct s3c24xx_uart_port *ourport,
 				     unsigned long ufstat)
 {
-	struct s3c24xx_uart_info *info = ourport->info;
+	const struct s3c24xx_uart_info *info = ourport->info;
 
 	if (ufstat & info->rx_fifofull)
 		return ourport->port.fifosize;
@@ -921,11 +921,8 @@ static void s3c24xx_serial_tx_chars(struct s3c24xx_uart_port *ourport)
 		return;
 	}
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
-		spin_unlock(&port->lock);
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
-		spin_lock(&port->lock);
-	}
 
 	if (uart_circ_empty(xmit))
 		s3c24xx_serial_stop_tx(port);
@@ -947,8 +944,8 @@ static irqreturn_t s3c24xx_serial_tx_irq(int irq, void *id)
 /* interrupt handler for s3c64xx and later SoC's.*/
 static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
 {
-	struct s3c24xx_uart_port *ourport = id;
-	struct uart_port *port = &ourport->port;
+	const struct s3c24xx_uart_port *ourport = id;
+	const struct uart_port *port = &ourport->port;
 	unsigned int pend = rd_regl(port, S3C64XX_UINTP);
 	irqreturn_t ret = IRQ_HANDLED;
 
@@ -966,8 +963,8 @@ static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
 /* interrupt handler for Apple SoC's.*/
 static irqreturn_t apple_serial_handle_irq(int irq, void *id)
 {
-	struct s3c24xx_uart_port *ourport = id;
-	struct uart_port *port = &ourport->port;
+	const struct s3c24xx_uart_port *ourport = id;
+	const struct uart_port *port = &ourport->port;
 	unsigned int pend = rd_regl(port, S3C2410_UTRSTAT);
 	irqreturn_t ret = IRQ_NONE;
 
@@ -986,7 +983,7 @@ static irqreturn_t apple_serial_handle_irq(int irq, void *id)
 
 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 {
-	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+	const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 	unsigned long ufstat = rd_regl(port, S3C2410_UFSTAT);
 	unsigned long ufcon = rd_regl(port, S3C2410_UFCON);
 
@@ -1405,7 +1402,7 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
 
 static inline int s3c24xx_serial_getsource(struct uart_port *port)
 {
-	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+	const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 	unsigned int ucon;
 
 	if (info->num_clks == 1)
@@ -1419,7 +1416,7 @@ static inline int s3c24xx_serial_getsource(struct uart_port *port)
 static void s3c24xx_serial_setsource(struct uart_port *port,
 			unsigned int clk_sel)
 {
-	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+	const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 	unsigned int ucon;
 
 	if (info->num_clks == 1)
@@ -1438,7 +1435,7 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
 			unsigned int req_baud, struct clk **best_clk,
 			unsigned int *clk_num)
 {
-	struct s3c24xx_uart_info *info = ourport->info;
+	const struct s3c24xx_uart_info *info = ourport->info;
 	struct clk *clk;
 	unsigned long rate;
 	unsigned int cnt, baud, quot, best_quot = 0;
@@ -1499,7 +1496,7 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport,
  * This table takes the fractional value of the baud divisor and gives
  * the recommended setting for the UDIVSLOT register.
  */
-static u16 udivslot_table[16] = {
+static const u16 udivslot_table[16] = {
 	[0] = 0x0000,
 	[1] = 0x0080,
 	[2] = 0x0808,
@@ -1522,7 +1519,7 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
 				       struct ktermios *termios,
 				       struct ktermios *old)
 {
-	struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
+	const struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port);
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 	struct clk *clk = ERR_PTR(-EINVAL);
 	unsigned long flags;
@@ -1675,7 +1672,7 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
 
 static const char *s3c24xx_serial_type(struct uart_port *port)
 {
-	struct s3c24xx_uart_port *ourport = to_ourport(port);
+	const struct s3c24xx_uart_port *ourport = to_ourport(port);
 
 	switch (ourport->info->type) {
 	case TYPE_S3C24XX:
@@ -1691,7 +1688,7 @@ static const char *s3c24xx_serial_type(struct uart_port *port)
 
 static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
 {
-	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+	const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 
 	if (flags & UART_CONFIG_TYPE)
 		port->type = info->port_type;
@@ -1703,7 +1700,7 @@ static void s3c24xx_serial_config_port(struct uart_port *port, int flags)
 static int
 s3c24xx_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
 {
-	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+	const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 
 	if (ser->type != PORT_UNKNOWN && ser->type != info->port_type)
 		return -EINVAL;
@@ -1873,9 +1870,9 @@ s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS] = {
  */
 
 static void s3c24xx_serial_resetport(struct uart_port *port,
-				   struct s3c2410_uartcfg *cfg)
+				     const struct s3c2410_uartcfg *cfg)
 {
-	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+	const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 	unsigned long ucon = rd_regl(port, S3C2410_UCON);
 
 	ucon &= (info->clksel_mask | info->ucon_mask);
@@ -1979,7 +1976,7 @@ s3c24xx_serial_cpufreq_deregister(struct s3c24xx_uart_port *port)
 static int s3c24xx_serial_enable_baudclk(struct s3c24xx_uart_port *ourport)
 {
 	struct device *dev = ourport->port.dev;
-	struct s3c24xx_uart_info *info = ourport->info;
+	const struct s3c24xx_uart_info *info = ourport->info;
 	char clk_name[MAX_CLK_NAME_LENGTH];
 	unsigned int clk_sel;
 	struct clk *clk;
@@ -2021,7 +2018,7 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 				    struct platform_device *platdev)
 {
 	struct uart_port *port = &ourport->port;
-	struct s3c2410_uartcfg *cfg = ourport->cfg;
+	const struct s3c2410_uartcfg *cfg = ourport->cfg;
 	struct resource *res;
 	int ret;
 
@@ -2150,23 +2147,14 @@ err:
 
 /* Device driver serial port probe */
 
-#ifdef CONFIG_OF
-static const struct of_device_id s3c24xx_uart_dt_match[];
-#endif
-
 static int probe_index;
 
-static inline struct s3c24xx_serial_drv_data *
+static inline const struct s3c24xx_serial_drv_data *
 s3c24xx_get_driver_data(struct platform_device *pdev)
 {
-#ifdef CONFIG_OF
-	if (pdev->dev.of_node) {
-		const struct of_device_id *match;
+	if (dev_of_node(&pdev->dev))
+		return of_device_get_match_data(&pdev->dev);
 
-		match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
-		return (struct s3c24xx_serial_drv_data *)match->data;
-	}
-#endif
 	return (struct s3c24xx_serial_drv_data *)
 			platform_get_device_id(pdev)->driver_data;
 }
@@ -2197,10 +2185,10 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 	}
 
 	ourport->baudclk = ERR_PTR(-EINVAL);
-	ourport->info = ourport->drv_data->info;
+	ourport->info = &ourport->drv_data->info;
 	ourport->cfg = (dev_get_platdata(&pdev->dev)) ?
 			dev_get_platdata(&pdev->dev) :
-			ourport->drv_data->def_cfg;
+			&ourport->drv_data->def_cfg;
 
 	switch (ourport->info->type) {
 	case TYPE_S3C24XX:
@@ -2419,7 +2407,7 @@ static struct uart_port *cons_uart;
 static int
 s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
 {
-	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
+	const struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
 	unsigned long ufstat, utrstat;
 
 	if (ufcon & S3C2410_UFCON_FIFOMODE) {
@@ -2450,7 +2438,7 @@ s3c24xx_port_configured(unsigned int ucon)
 
 static int s3c24xx_serial_get_poll_char(struct uart_port *port)
 {
-	struct s3c24xx_uart_port *ourport = to_ourport(port);
+	const struct s3c24xx_uart_port *ourport = to_ourport(port);
 	unsigned int ufstat;
 
 	ufstat = rd_regl(port, S3C2410_UFSTAT);
@@ -2478,7 +2466,7 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port,
 #endif /* CONFIG_CONSOLE_POLL */
 
 static void
-s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
+s3c24xx_serial_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
 
@@ -2615,8 +2603,8 @@ static struct console s3c24xx_serial_console = {
 #endif /* CONFIG_SERIAL_SAMSUNG_CONSOLE */
 
 #ifdef CONFIG_CPU_S3C2410
-static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
-	.info = &(struct s3c24xx_uart_info) {
+static const struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
+	.info = {
 		.name		= "Samsung S3C2410 UART",
 		.type		= TYPE_S3C24XX,
 		.port_type	= PORT_S3C2410,
@@ -2632,19 +2620,19 @@ static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
 		.clksel_mask	= S3C2410_UCON_CLKMASK,
 		.clksel_shift	= S3C2410_UCON_CLKSHIFT,
 	},
-	.def_cfg = &(struct s3c2410_uartcfg) {
+	.def_cfg = {
 		.ucon		= S3C2410_UCON_DEFAULT,
 		.ufcon		= S3C2410_UFCON_DEFAULT,
 	},
 };
-#define S3C2410_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2410_serial_drv_data)
+#define S3C2410_SERIAL_DRV_DATA (&s3c2410_serial_drv_data)
 #else
-#define S3C2410_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#define S3C2410_SERIAL_DRV_DATA NULL
 #endif
 
 #ifdef CONFIG_CPU_S3C2412
-static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
-	.info = &(struct s3c24xx_uart_info) {
+static const struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
+	.info = {
 		.name		= "Samsung S3C2412 UART",
 		.type		= TYPE_S3C24XX,
 		.port_type	= PORT_S3C2412,
@@ -2661,20 +2649,20 @@ static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
 		.clksel_mask	= S3C2412_UCON_CLKMASK,
 		.clksel_shift	= S3C2412_UCON_CLKSHIFT,
 	},
-	.def_cfg = &(struct s3c2410_uartcfg) {
+	.def_cfg = {
 		.ucon		= S3C2410_UCON_DEFAULT,
 		.ufcon		= S3C2410_UFCON_DEFAULT,
 	},
 };
-#define S3C2412_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2412_serial_drv_data)
+#define S3C2412_SERIAL_DRV_DATA (&s3c2412_serial_drv_data)
 #else
-#define S3C2412_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#define S3C2412_SERIAL_DRV_DATA NULL
 #endif
 
 #if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2416) || \
 	defined(CONFIG_CPU_S3C2443) || defined(CONFIG_CPU_S3C2442)
-static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
-	.info = &(struct s3c24xx_uart_info) {
+static const struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
+	.info = {
 		.name		= "Samsung S3C2440 UART",
 		.type		= TYPE_S3C24XX,
 		.port_type	= PORT_S3C2440,
@@ -2692,19 +2680,19 @@ static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
 		.clksel_shift	= S3C2412_UCON_CLKSHIFT,
 		.ucon_mask	= S3C2440_UCON0_DIVMASK,
 	},
-	.def_cfg = &(struct s3c2410_uartcfg) {
+	.def_cfg = {
 		.ucon		= S3C2410_UCON_DEFAULT,
 		.ufcon		= S3C2410_UFCON_DEFAULT,
 	},
 };
-#define S3C2440_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c2440_serial_drv_data)
+#define S3C2440_SERIAL_DRV_DATA (&s3c2440_serial_drv_data)
 #else
-#define S3C2440_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#define S3C2440_SERIAL_DRV_DATA NULL
 #endif
 
 #if defined(CONFIG_CPU_S3C6400) || defined(CONFIG_CPU_S3C6410)
-static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
-	.info = &(struct s3c24xx_uart_info) {
+static const struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
+	.info = {
 		.name		= "Samsung S3C6400 UART",
 		.type		= TYPE_S3C6400,
 		.port_type	= PORT_S3C6400,
@@ -2721,19 +2709,19 @@ static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
 		.clksel_mask	= S3C6400_UCON_CLKMASK,
 		.clksel_shift	= S3C6400_UCON_CLKSHIFT,
 	},
-	.def_cfg = &(struct s3c2410_uartcfg) {
+	.def_cfg = {
 		.ucon		= S3C2410_UCON_DEFAULT,
 		.ufcon		= S3C2410_UFCON_DEFAULT,
 	},
 };
-#define S3C6400_SERIAL_DRV_DATA ((kernel_ulong_t)&s3c6400_serial_drv_data)
+#define S3C6400_SERIAL_DRV_DATA (&s3c6400_serial_drv_data)
 #else
-#define S3C6400_SERIAL_DRV_DATA (kernel_ulong_t)NULL
+#define S3C6400_SERIAL_DRV_DATA NULL
 #endif
 
 #ifdef CONFIG_CPU_S5PV210
-static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
-	.info = &(struct s3c24xx_uart_info) {
+static const struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
+	.info = {
 		.name		= "Samsung S5PV210 UART",
 		.type		= TYPE_S3C6400,
 		.port_type	= PORT_S3C6400,
@@ -2749,20 +2737,20 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
 		.clksel_mask	= S5PV210_UCON_CLKMASK,
 		.clksel_shift	= S5PV210_UCON_CLKSHIFT,
 	},
-	.def_cfg = &(struct s3c2410_uartcfg) {
+	.def_cfg = {
 		.ucon		= S5PV210_UCON_DEFAULT,
 		.ufcon		= S5PV210_UFCON_DEFAULT,
 	},
 	.fifosize = { 256, 64, 16, 16 },
 };
-#define S5PV210_SERIAL_DRV_DATA ((kernel_ulong_t)&s5pv210_serial_drv_data)
+#define S5PV210_SERIAL_DRV_DATA (&s5pv210_serial_drv_data)
 #else
-#define S5PV210_SERIAL_DRV_DATA	(kernel_ulong_t)NULL
+#define S5PV210_SERIAL_DRV_DATA	NULL
 #endif
 
 #if defined(CONFIG_ARCH_EXYNOS)
 #define EXYNOS_COMMON_SERIAL_DRV_DATA()				\
-	.info = &(struct s3c24xx_uart_info) {			\
+	.info = {						\
 		.name		= "Samsung Exynos UART",	\
 		.type		= TYPE_S3C6400,			\
 		.port_type	= PORT_S3C6400,			\
@@ -2778,40 +2766,40 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
 		.clksel_mask	= 0,				\
 		.clksel_shift	= 0,				\
 	},							\
-	.def_cfg = &(struct s3c2410_uartcfg) {			\
+	.def_cfg = {						\
 		.ucon		= S5PV210_UCON_DEFAULT,		\
 		.ufcon		= S5PV210_UFCON_DEFAULT,	\
 		.has_fracval	= 1,				\
 	}							\
 
-static struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
+static const struct s3c24xx_serial_drv_data exynos4210_serial_drv_data = {
 	EXYNOS_COMMON_SERIAL_DRV_DATA(),
 	.fifosize = { 256, 64, 16, 16 },
 };
 
-static struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
+static const struct s3c24xx_serial_drv_data exynos5433_serial_drv_data = {
 	EXYNOS_COMMON_SERIAL_DRV_DATA(),
 	.fifosize = { 64, 256, 16, 256 },
 };
 
-static struct s3c24xx_serial_drv_data exynos850_serial_drv_data = {
+static const struct s3c24xx_serial_drv_data exynos850_serial_drv_data = {
 	EXYNOS_COMMON_SERIAL_DRV_DATA(),
 	.fifosize = { 256, 64, 64, 64 },
 };
 
-#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos4210_serial_drv_data)
-#define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos5433_serial_drv_data)
-#define EXYNOS850_SERIAL_DRV_DATA ((kernel_ulong_t)&exynos850_serial_drv_data)
+#define EXYNOS4210_SERIAL_DRV_DATA (&exynos4210_serial_drv_data)
+#define EXYNOS5433_SERIAL_DRV_DATA (&exynos5433_serial_drv_data)
+#define EXYNOS850_SERIAL_DRV_DATA (&exynos850_serial_drv_data)
 
 #else
-#define EXYNOS4210_SERIAL_DRV_DATA ((kernel_ulong_t)NULL)
-#define EXYNOS5433_SERIAL_DRV_DATA ((kernel_ulong_t)NULL)
-#define EXYNOS850_SERIAL_DRV_DATA ((kernel_ulong_t)NULL)
+#define EXYNOS4210_SERIAL_DRV_DATA NULL
+#define EXYNOS5433_SERIAL_DRV_DATA NULL
+#define EXYNOS850_SERIAL_DRV_DATA NULL
 #endif
 
 #ifdef CONFIG_ARCH_APPLE
-static struct s3c24xx_serial_drv_data s5l_serial_drv_data = {
-	.info = &(struct s3c24xx_uart_info) {
+static const struct s3c24xx_serial_drv_data s5l_serial_drv_data = {
+	.info = {
 		.name		= "Apple S5L UART",
 		.type		= TYPE_APPLE_S5L,
 		.port_type	= PORT_8250,
@@ -2827,44 +2815,77 @@ static struct s3c24xx_serial_drv_data s5l_serial_drv_data = {
 		.clksel_mask	= 0,
 		.clksel_shift	= 0,
 	},
-	.def_cfg = &(struct s3c2410_uartcfg) {
+	.def_cfg = {
 		.ucon		= APPLE_S5L_UCON_DEFAULT,
 		.ufcon		= S3C2410_UFCON_DEFAULT,
 	},
 };
-#define S5L_SERIAL_DRV_DATA ((kernel_ulong_t)&s5l_serial_drv_data)
+#define S5L_SERIAL_DRV_DATA (&s5l_serial_drv_data)
 #else
-#define S5L_SERIAL_DRV_DATA ((kernel_ulong_t)NULL)
+#define S5L_SERIAL_DRV_DATA NULL
+#endif
+
+#if defined(CONFIG_ARCH_ARTPEC)
+static const struct s3c24xx_serial_drv_data artpec8_serial_drv_data = {
+	.info = {
+		.name		= "Axis ARTPEC-8 UART",
+		.type		= TYPE_S3C6400,
+		.port_type	= PORT_S3C6400,
+		.fifosize	= 64,
+		.has_divslot	= 1,
+		.rx_fifomask	= S5PV210_UFSTAT_RXMASK,
+		.rx_fifoshift	= S5PV210_UFSTAT_RXSHIFT,
+		.rx_fifofull	= S5PV210_UFSTAT_RXFULL,
+		.tx_fifofull	= S5PV210_UFSTAT_TXFULL,
+		.tx_fifomask	= S5PV210_UFSTAT_TXMASK,
+		.tx_fifoshift	= S5PV210_UFSTAT_TXSHIFT,
+		.def_clk_sel	= S3C2410_UCON_CLKSEL0,
+		.num_clks	= 1,
+		.clksel_mask	= 0,
+		.clksel_shift	= 0,
+	},
+	.def_cfg = {
+		.ucon		= S5PV210_UCON_DEFAULT,
+		.ufcon		= S5PV210_UFCON_DEFAULT,
+		.has_fracval	= 1,
+	}
+};
+#define ARTPEC8_SERIAL_DRV_DATA (&artpec8_serial_drv_data)
+#else
+#define ARTPEC8_SERIAL_DRV_DATA (NULL)
 #endif
 
 static const struct platform_device_id s3c24xx_serial_driver_ids[] = {
 	{
 		.name		= "s3c2410-uart",
-		.driver_data	= S3C2410_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)S3C2410_SERIAL_DRV_DATA,
 	}, {
 		.name		= "s3c2412-uart",
-		.driver_data	= S3C2412_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)S3C2412_SERIAL_DRV_DATA,
 	}, {
 		.name		= "s3c2440-uart",
-		.driver_data	= S3C2440_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)S3C2440_SERIAL_DRV_DATA,
 	}, {
 		.name		= "s3c6400-uart",
-		.driver_data	= S3C6400_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)S3C6400_SERIAL_DRV_DATA,
 	}, {
 		.name		= "s5pv210-uart",
-		.driver_data	= S5PV210_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)S5PV210_SERIAL_DRV_DATA,
 	}, {
 		.name		= "exynos4210-uart",
-		.driver_data	= EXYNOS4210_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)EXYNOS4210_SERIAL_DRV_DATA,
 	}, {
 		.name		= "exynos5433-uart",
-		.driver_data	= EXYNOS5433_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)EXYNOS5433_SERIAL_DRV_DATA,
 	}, {
 		.name		= "s5l-uart",
-		.driver_data	= S5L_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)S5L_SERIAL_DRV_DATA,
 	}, {
 		.name		= "exynos850-uart",
-		.driver_data	= EXYNOS850_SERIAL_DRV_DATA,
+		.driver_data	= (kernel_ulong_t)EXYNOS850_SERIAL_DRV_DATA,
+	}, {
+		.name		= "artpec8-uart",
+		.driver_data	= (kernel_ulong_t)ARTPEC8_SERIAL_DRV_DATA,
 	},
 	{ },
 };
@@ -2873,23 +2894,25 @@ MODULE_DEVICE_TABLE(platform, s3c24xx_serial_driver_ids);
 #ifdef CONFIG_OF
 static const struct of_device_id s3c24xx_uart_dt_match[] = {
 	{ .compatible = "samsung,s3c2410-uart",
-		.data = (void *)S3C2410_SERIAL_DRV_DATA },
+		.data = S3C2410_SERIAL_DRV_DATA },
 	{ .compatible = "samsung,s3c2412-uart",
-		.data = (void *)S3C2412_SERIAL_DRV_DATA },
+		.data = S3C2412_SERIAL_DRV_DATA },
 	{ .compatible = "samsung,s3c2440-uart",
-		.data = (void *)S3C2440_SERIAL_DRV_DATA },
+		.data = S3C2440_SERIAL_DRV_DATA },
 	{ .compatible = "samsung,s3c6400-uart",
-		.data = (void *)S3C6400_SERIAL_DRV_DATA },
+		.data = S3C6400_SERIAL_DRV_DATA },
 	{ .compatible = "samsung,s5pv210-uart",
-		.data = (void *)S5PV210_SERIAL_DRV_DATA },
+		.data = S5PV210_SERIAL_DRV_DATA },
 	{ .compatible = "samsung,exynos4210-uart",
-		.data = (void *)EXYNOS4210_SERIAL_DRV_DATA },
+		.data = EXYNOS4210_SERIAL_DRV_DATA },
 	{ .compatible = "samsung,exynos5433-uart",
-		.data = (void *)EXYNOS5433_SERIAL_DRV_DATA },
+		.data = EXYNOS5433_SERIAL_DRV_DATA },
 	{ .compatible = "apple,s5l-uart",
-		.data = (void *)S5L_SERIAL_DRV_DATA },
+		.data = S5L_SERIAL_DRV_DATA },
 	{ .compatible = "samsung,exynos850-uart",
-		.data = (void *)EXYNOS850_SERIAL_DRV_DATA },
+		.data = EXYNOS850_SERIAL_DRV_DATA },
+	{ .compatible = "axis,artpec8-uart",
+		.data = ARTPEC8_SERIAL_DRV_DATA },
 	{},
 };
 MODULE_DEVICE_TABLE(of, s3c24xx_uart_dt_match);
@@ -2935,7 +2958,7 @@ module_exit(samsung_serial_exit);
  * Early console.
  */
 
-static void wr_reg_barrier(struct uart_port *port, u32 reg, u32 val)
+static void wr_reg_barrier(const struct uart_port *port, u32 reg, u32 val)
 {
 	switch (port->iotype) {
 	case UPIO_MEM:
@@ -2949,23 +2972,24 @@ static void wr_reg_barrier(struct uart_port *port, u32 reg, u32 val)
 
 struct samsung_early_console_data {
 	u32 txfull_mask;
+	u32 rxfifo_mask;
 };
 
-static void samsung_early_busyuart(struct uart_port *port)
+static void samsung_early_busyuart(const struct uart_port *port)
 {
 	while (!(readl(port->membase + S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXFE))
 		;
 }
 
-static void samsung_early_busyuart_fifo(struct uart_port *port)
+static void samsung_early_busyuart_fifo(const struct uart_port *port)
 {
-	struct samsung_early_console_data *data = port->private_data;
+	const struct samsung_early_console_data *data = port->private_data;
 
 	while (readl(port->membase + S3C2410_UFSTAT) & data->txfull_mask)
 		;
 }
 
-static void samsung_early_putc(struct uart_port *port, int c)
+static void samsung_early_putc(struct uart_port *port, unsigned char c)
 {
 	if (readl(port->membase + S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE)
 		samsung_early_busyuart_fifo(port);
@@ -2983,6 +3007,26 @@ static void samsung_early_write(struct console *con, const char *s,
 	uart_console_write(&dev->port, s, n, samsung_early_putc);
 }
 
+static int samsung_early_read(struct console *con, char *s, unsigned int n)
+{
+	struct earlycon_device *dev = con->data;
+	const struct samsung_early_console_data *data = dev->port.private_data;
+	int ch, ufstat, num_read = 0;
+
+	while (num_read < n) {
+		ufstat = rd_regl(&dev->port, S3C2410_UFSTAT);
+		if (!(ufstat & data->rxfifo_mask))
+			break;
+		ch = rd_reg(&dev->port, S3C2410_URXH);
+		if (ch == NO_POLL_CHAR)
+			break;
+
+		s[num_read++] = ch;
+	}
+
+	return num_read;
+}
+
 static int __init samsung_early_console_setup(struct earlycon_device *device,
 					      const char *opt)
 {
@@ -2990,12 +3034,14 @@ static int __init samsung_early_console_setup(struct earlycon_device *device,
 		return -ENODEV;
 
 	device->con->write = samsung_early_write;
+	device->con->read = samsung_early_read;
 	return 0;
 }
 
 /* S3C2410 */
 static struct samsung_early_console_data s3c2410_early_console_data = {
 	.txfull_mask = S3C2410_UFSTAT_TXFULL,
+	.rxfifo_mask = S3C2410_UFSTAT_RXFULL | S3C2410_UFSTAT_RXMASK,
 };
 
 static int __init s3c2410_early_console_setup(struct earlycon_device *device,
@@ -3011,6 +3057,7 @@ OF_EARLYCON_DECLARE(s3c2410, "samsung,s3c2410-uart",
 /* S3C2412, S3C2440, S3C64xx */
 static struct samsung_early_console_data s3c2440_early_console_data = {
 	.txfull_mask = S3C2440_UFSTAT_TXFULL,
+	.rxfifo_mask = S3C2440_UFSTAT_RXFULL | S3C2440_UFSTAT_RXMASK,
 };
 
 static int __init s3c2440_early_console_setup(struct earlycon_device *device,
@@ -3030,6 +3077,7 @@ OF_EARLYCON_DECLARE(s3c6400, "samsung,s3c6400-uart",
 /* S5PV210, Exynos */
 static struct samsung_early_console_data s5pv210_early_console_data = {
 	.txfull_mask = S5PV210_UFSTAT_TXFULL,
+	.rxfifo_mask = S5PV210_UFSTAT_RXFULL | S5PV210_UFSTAT_RXMASK,
 };
 
 static int __init s5pv210_early_console_setup(struct earlycon_device *device,
@@ -3043,6 +3091,8 @@ OF_EARLYCON_DECLARE(s5pv210, "samsung,s5pv210-uart",
 			s5pv210_early_console_setup);
 OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
 			s5pv210_early_console_setup);
+OF_EARLYCON_DECLARE(artpec8, "axis,artpec8-uart",
+			s5pv210_early_console_setup);
 
 /* Apple S5L */
 static int __init apple_s5l_early_console_setup(struct earlycon_device *device,
diff --git a/drivers/tty/serial/sb1250-duart.c b/drivers/tty/serial/sb1250-duart.c
index 738df6d9c0d9..2cf8533ef760 100644
--- a/drivers/tty/serial/sb1250-duart.c
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -820,7 +820,7 @@ static void __init sbd_probe_duarts(void)
  * console output.  The console_lock is held by the caller, so we
  * shouldn't be interrupted for more console activity.
  */
-static void sbd_console_putchar(struct uart_port *uport, int ch)
+static void sbd_console_putchar(struct uart_port *uport, unsigned char ch)
 {
 	struct sbd_port *sport = to_sport(uport);
 
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 3a6c68e19c80..e857fb61efbf 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -289,6 +289,14 @@
 						  *       XON1, XON2, XOFF1 and
 						  *       XOFF2
 						  */
+#define SC16IS7XX_EFR_FLOWCTRL_BITS	(SC16IS7XX_EFR_AUTORTS_BIT | \
+					SC16IS7XX_EFR_AUTOCTS_BIT | \
+					SC16IS7XX_EFR_XOFF2_DETECT_BIT | \
+					SC16IS7XX_EFR_SWFLOW3_BIT | \
+					SC16IS7XX_EFR_SWFLOW2_BIT | \
+					SC16IS7XX_EFR_SWFLOW1_BIT | \
+					SC16IS7XX_EFR_SWFLOW0_BIT)
+
 
 /* Misc definitions */
 #define SC16IS7XX_FIFO_SIZE		(64)
@@ -298,6 +306,7 @@ struct sc16is7xx_devtype {
 	char	name[10];
 	int	nr_gpio;
 	int	nr_uart;
+	int	has_mctrl;
 };
 
 #define SC16IS7XX_RECONF_MD		(1 << 0)
@@ -306,7 +315,8 @@ struct sc16is7xx_devtype {
 
 struct sc16is7xx_one_config {
 	unsigned int			flags;
-	u8				ier_clear;
+	u8				ier_mask;
+	u8				ier_val;
 };
 
 struct sc16is7xx_one {
@@ -314,8 +324,10 @@ struct sc16is7xx_one {
 	u8				line;
 	struct kthread_work		tx_work;
 	struct kthread_work		reg_work;
+	struct kthread_delayed_work	ms_work;
 	struct sc16is7xx_one_config	config;
 	bool				irda_mode;
+	unsigned int			old_mctrl;
 };
 
 struct sc16is7xx_port {
@@ -340,6 +352,9 @@ static struct uart_driver sc16is7xx_uart = {
 	.nr		= SC16IS7XX_MAX_DEVS,
 };
 
+static void sc16is7xx_ier_set(struct uart_port *port, u8 bit);
+static void sc16is7xx_stop_tx(struct uart_port *port);
+
 #define to_sc16is7xx_port(p,e)	((container_of((p), struct sc16is7xx_port, e)))
 #define to_sc16is7xx_one(p,e)	((container_of((p), struct sc16is7xx_one, e)))
 
@@ -432,30 +447,35 @@ static const struct sc16is7xx_devtype sc16is74x_devtype = {
 	.name		= "SC16IS74X",
 	.nr_gpio	= 0,
 	.nr_uart	= 1,
+	.has_mctrl	= 0,
 };
 
 static const struct sc16is7xx_devtype sc16is750_devtype = {
 	.name		= "SC16IS750",
-	.nr_gpio	= 8,
+	.nr_gpio	= 4,
 	.nr_uart	= 1,
+	.has_mctrl	= 1,
 };
 
 static const struct sc16is7xx_devtype sc16is752_devtype = {
 	.name		= "SC16IS752",
-	.nr_gpio	= 8,
+	.nr_gpio	= 0,
 	.nr_uart	= 2,
+	.has_mctrl	= 1,
 };
 
 static const struct sc16is7xx_devtype sc16is760_devtype = {
 	.name		= "SC16IS760",
-	.nr_gpio	= 8,
+	.nr_gpio	= 4,
 	.nr_uart	= 1,
+	.has_mctrl	= 1,
 };
 
 static const struct sc16is7xx_devtype sc16is762_devtype = {
 	.name		= "SC16IS762",
-	.nr_gpio	= 8,
+	.nr_gpio	= 0,
 	.nr_uart	= 2,
+	.has_mctrl	= 1,
 };
 
 static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg)
@@ -523,8 +543,10 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud)
 
 	/* Enable enhanced features */
 	regcache_cache_bypass(s->regmap, true);
-	sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
-			     SC16IS7XX_EFR_ENABLE_BIT);
+	sc16is7xx_port_update(port, SC16IS7XX_EFR_REG,
+			      SC16IS7XX_EFR_ENABLE_BIT,
+			      SC16IS7XX_EFR_ENABLE_BIT);
+
 	regcache_cache_bypass(s->regmap, false);
 
 	/* Put LCR back to the normal mode */
@@ -635,6 +657,7 @@ 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;
+	unsigned long flags;
 
 	if (unlikely(port->x_char)) {
 		sc16is7xx_port_write(port, SC16IS7XX_THR_REG, port->x_char);
@@ -643,8 +666,12 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
 		return;
 	}
 
-	if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+		spin_lock_irqsave(&port->lock, flags);
+		sc16is7xx_stop_tx(port);
+		spin_unlock_irqrestore(&port->lock, flags);
 		return;
+	}
 
 	/* Get length of data pending in circular buffer */
 	to_send = uart_circ_chars_pending(xmit);
@@ -671,8 +698,56 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
 		sc16is7xx_fifo_write(port, to_send);
 	}
 
+	spin_lock_irqsave(&port->lock, flags);
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit))
+		sc16is7xx_stop_tx(port);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static unsigned int sc16is7xx_get_hwmctrl(struct uart_port *port)
+{
+	u8 msr = sc16is7xx_port_read(port, SC16IS7XX_MSR_REG);
+	unsigned int mctrl = 0;
+
+	mctrl |= (msr & SC16IS7XX_MSR_CTS_BIT) ? TIOCM_CTS : 0;
+	mctrl |= (msr & SC16IS7XX_MSR_DSR_BIT) ? TIOCM_DSR : 0;
+	mctrl |= (msr & SC16IS7XX_MSR_CD_BIT)  ? TIOCM_CAR : 0;
+	mctrl |= (msr & SC16IS7XX_MSR_RI_BIT)  ? TIOCM_RNG : 0;
+	return mctrl;
+}
+
+static void sc16is7xx_update_mlines(struct sc16is7xx_one *one)
+{
+	struct uart_port *port = &one->port;
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	unsigned long flags;
+	unsigned int status, changed;
+
+	lockdep_assert_held_once(&s->efr_lock);
+
+	status = sc16is7xx_get_hwmctrl(port);
+	changed = status ^ one->old_mctrl;
+
+	if (changed == 0)
+		return;
+
+	one->old_mctrl = status;
+
+	spin_lock_irqsave(&port->lock, flags);
+	if ((changed & TIOCM_RNG) && (status & TIOCM_RNG))
+		port->icount.rng++;
+	if (changed & TIOCM_DSR)
+		port->icount.dsr++;
+	if (changed & TIOCM_CAR)
+		uart_handle_dcd_change(port, status & TIOCM_CAR);
+	if (changed & TIOCM_CTS)
+		uart_handle_cts_change(port, status & TIOCM_CTS);
+
+	wake_up_interruptible(&port->state->port.delta_msr_wait);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
@@ -681,6 +756,7 @@ static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
 
 	do {
 		unsigned int iir, rxlen;
+		struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
 
 		iir = sc16is7xx_port_read(port, SC16IS7XX_IIR_REG);
 		if (iir & SC16IS7XX_IIR_NO_INT_BIT)
@@ -697,6 +773,11 @@ static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
 			if (rxlen)
 				sc16is7xx_handle_rx(port, rxlen, iir);
 			break;
+		/* CTSRTS interrupt comes only when CTS goes inactive */
+		case SC16IS7XX_IIR_CTSRTS_SRC:
+		case SC16IS7XX_IIR_MSI_SRC:
+			sc16is7xx_update_mlines(one);
+			break;
 		case SC16IS7XX_IIR_THRI_SRC:
 			sc16is7xx_handle_tx(port);
 			break;
@@ -735,6 +816,7 @@ static void sc16is7xx_tx_proc(struct kthread_work *ws)
 {
 	struct uart_port *port = &(to_sc16is7xx_one(ws, tx_work)->port);
 	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	unsigned long flags;
 
 	if ((port->rs485.flags & SER_RS485_ENABLED) &&
 	    (port->rs485.delay_rts_before_send > 0))
@@ -743,6 +825,10 @@ static void sc16is7xx_tx_proc(struct kthread_work *ws)
 	mutex_lock(&s->efr_lock);
 	sc16is7xx_handle_tx(port);
 	mutex_unlock(&s->efr_lock);
+
+	spin_lock_irqsave(&port->lock, flags);
+	sc16is7xx_ier_set(port, SC16IS7XX_IER_THRI_BIT);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void sc16is7xx_reconf_rs485(struct uart_port *port)
@@ -777,22 +863,27 @@ static void sc16is7xx_reg_proc(struct kthread_work *ws)
 	spin_unlock_irqrestore(&one->port.lock, irqflags);
 
 	if (config.flags & SC16IS7XX_RECONF_MD) {
+		u8 mcr = 0;
+
+		/* Device ignores RTS setting when hardware flow is enabled */
+		if (one->port.mctrl & TIOCM_RTS)
+			mcr |= SC16IS7XX_MCR_RTS_BIT;
+
+		if (one->port.mctrl & TIOCM_DTR)
+			mcr |= SC16IS7XX_MCR_DTR_BIT;
+
+		if (one->port.mctrl & TIOCM_LOOP)
+			mcr |= SC16IS7XX_MCR_LOOP_BIT;
 		sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
+				      SC16IS7XX_MCR_RTS_BIT |
+				      SC16IS7XX_MCR_DTR_BIT |
 				      SC16IS7XX_MCR_LOOP_BIT,
-				      (one->port.mctrl & TIOCM_LOOP) ?
-				      SC16IS7XX_MCR_LOOP_BIT : 0);
-		sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
-				      SC16IS7XX_MCR_RTS_BIT,
-				      (one->port.mctrl & TIOCM_RTS) ?
-				      SC16IS7XX_MCR_RTS_BIT : 0);
-		sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
-				      SC16IS7XX_MCR_DTR_BIT,
-				      (one->port.mctrl & TIOCM_DTR) ?
-				      SC16IS7XX_MCR_DTR_BIT : 0);
+				      mcr);
 	}
+
 	if (config.flags & SC16IS7XX_RECONF_IER)
 		sc16is7xx_port_update(&one->port, SC16IS7XX_IER_REG,
-				      config.ier_clear, 0);
+				      config.ier_mask, config.ier_val);
 
 	if (config.flags & SC16IS7XX_RECONF_RS485)
 		sc16is7xx_reconf_rs485(&one->port);
@@ -803,8 +894,24 @@ static void sc16is7xx_ier_clear(struct uart_port *port, u8 bit)
 	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
 	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
 
+	lockdep_assert_held_once(&port->lock);
+
+	one->config.flags |= SC16IS7XX_RECONF_IER;
+	one->config.ier_mask |= bit;
+	one->config.ier_val &= ~bit;
+	kthread_queue_work(&s->kworker, &one->reg_work);
+}
+
+static void sc16is7xx_ier_set(struct uart_port *port, u8 bit)
+{
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+	lockdep_assert_held_once(&port->lock);
+
 	one->config.flags |= SC16IS7XX_RECONF_IER;
-	one->config.ier_clear |= bit;
+	one->config.ier_mask |= bit;
+	one->config.ier_val |= bit;
 	kthread_queue_work(&s->kworker, &one->reg_work);
 }
 
@@ -818,6 +925,30 @@ static void sc16is7xx_stop_rx(struct uart_port *port)
 	sc16is7xx_ier_clear(port, SC16IS7XX_IER_RDI_BIT);
 }
 
+static void sc16is7xx_ms_proc(struct kthread_work *ws)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(ws, ms_work.work);
+	struct sc16is7xx_port *s = dev_get_drvdata(one->port.dev);
+
+	if (one->port.state) {
+		mutex_lock(&s->efr_lock);
+		sc16is7xx_update_mlines(one);
+		mutex_unlock(&s->efr_lock);
+
+		kthread_queue_delayed_work(&s->kworker, &one->ms_work, HZ);
+	}
+}
+
+static void sc16is7xx_enable_ms(struct uart_port *port)
+{
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+
+	lockdep_assert_held_once(&port->lock);
+
+	kthread_queue_delayed_work(&s->kworker, &one->ms_work, 0);
+}
+
 static void sc16is7xx_start_tx(struct uart_port *port)
 {
 	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
@@ -826,6 +957,29 @@ static void sc16is7xx_start_tx(struct uart_port *port)
 	kthread_queue_work(&s->kworker, &one->tx_work);
 }
 
+static void sc16is7xx_throttle(struct uart_port *port)
+{
+	unsigned long flags;
+
+	/*
+	 * Hardware flow control is enabled and thus the device ignores RTS
+	 * value set in MCR register. Stop reading data from RX FIFO so the
+	 * AutoRTS feature will de-activate RTS output.
+	 */
+	spin_lock_irqsave(&port->lock, flags);
+	sc16is7xx_ier_clear(port, SC16IS7XX_IER_RDI_BIT);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void sc16is7xx_unthrottle(struct uart_port *port)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+	sc16is7xx_ier_set(port, SC16IS7XX_IER_RDI_BIT);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
 static unsigned int sc16is7xx_tx_empty(struct uart_port *port)
 {
 	unsigned int lsr;
@@ -837,10 +991,10 @@ static unsigned int sc16is7xx_tx_empty(struct uart_port *port)
 
 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;
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+	/* Called with port lock taken so we can only return cached value */
+	return one->old_mctrl;
 }
 
 static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
@@ -864,8 +1018,12 @@ static void sc16is7xx_set_termios(struct uart_port *port,
 				  struct ktermios *old)
 {
 	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
 	unsigned int lcr, flow = 0;
 	int baud;
+	unsigned long flags;
+
+	kthread_cancel_delayed_work_sync(&one->ms_work);
 
 	/* Mask termios capabilities we don't support */
 	termios->c_cflag &= ~CMSPAR;
@@ -927,15 +1085,22 @@ static void sc16is7xx_set_termios(struct uart_port *port,
 	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)
+
+	port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS);
+	if (termios->c_cflag & CRTSCTS) {
 		flow |= SC16IS7XX_EFR_AUTOCTS_BIT |
 			SC16IS7XX_EFR_AUTORTS_BIT;
+		port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
+	}
 	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);
+	sc16is7xx_port_update(port,
+			      SC16IS7XX_EFR_REG,
+			      SC16IS7XX_EFR_FLOWCTRL_BITS,
+			      flow);
 	regcache_cache_bypass(s->regmap, false);
 
 	/* Update LCR register */
@@ -951,8 +1116,15 @@ static void sc16is7xx_set_termios(struct uart_port *port,
 	/* Setup baudrate generator */
 	baud = sc16is7xx_set_baud(port, baud);
 
+	spin_lock_irqsave(&port->lock, flags);
+
 	/* Update timeout according to new baud rate */
 	uart_update_timeout(port, termios->c_cflag, baud);
+
+	if (UART_ENABLE_MS(port, termios->c_cflag))
+		sc16is7xx_enable_ms(port);
+
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static int sc16is7xx_config_rs485(struct uart_port *port,
@@ -993,6 +1165,7 @@ static int sc16is7xx_startup(struct uart_port *port)
 	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
 	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
 	unsigned int val;
+	unsigned long flags;
 
 	sc16is7xx_power(port, 1);
 
@@ -1010,8 +1183,9 @@ static int sc16is7xx_startup(struct uart_port *port)
 	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);
+	sc16is7xx_port_update(port, SC16IS7XX_EFR_REG,
+			      SC16IS7XX_EFR_ENABLE_BIT,
+			      SC16IS7XX_EFR_ENABLE_BIT);
 
 	/* Enable TCR/TLR */
 	sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
@@ -1042,23 +1216,34 @@ static int sc16is7xx_startup(struct uart_port *port)
 			      SC16IS7XX_EFCR_TXDISABLE_BIT,
 			      0);
 
-	/* Enable RX, TX interrupts */
-	val = SC16IS7XX_IER_RDI_BIT | SC16IS7XX_IER_THRI_BIT;
+	/* Enable RX, CTS change and modem lines interrupts */
+	val = SC16IS7XX_IER_RDI_BIT | SC16IS7XX_IER_CTSI_BIT |
+	      SC16IS7XX_IER_MSI_BIT;
 	sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val);
 
+	/* Enable modem status polling */
+	spin_lock_irqsave(&port->lock, flags);
+	sc16is7xx_enable_ms(port);
+	spin_unlock_irqrestore(&port->lock, flags);
+
 	return 0;
 }
 
 static void sc16is7xx_shutdown(struct uart_port *port)
 {
 	struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+	struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+	kthread_cancel_delayed_work_sync(&one->ms_work);
 
 	/* Disable all interrupts */
 	sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
-	/* Disable TX/RX */
+	/* Disable TX/RX, clear auto RS485 and RTS invert */
 	sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
 			      SC16IS7XX_EFCR_RXDISABLE_BIT |
-			      SC16IS7XX_EFCR_TXDISABLE_BIT,
+			      SC16IS7XX_EFCR_TXDISABLE_BIT |
+			      SC16IS7XX_EFCR_AUTO_RS485_BIT |
+			      SC16IS7XX_EFCR_RTS_INVERT_BIT,
 			      SC16IS7XX_EFCR_RXDISABLE_BIT |
 			      SC16IS7XX_EFCR_TXDISABLE_BIT);
 
@@ -1114,7 +1299,10 @@ static const struct uart_ops sc16is7xx_ops = {
 	.get_mctrl	= sc16is7xx_get_mctrl,
 	.stop_tx	= sc16is7xx_stop_tx,
 	.start_tx	= sc16is7xx_start_tx,
+	.throttle	= sc16is7xx_throttle,
+	.unthrottle	= sc16is7xx_unthrottle,
 	.stop_rx	= sc16is7xx_stop_rx,
+	.enable_ms	= sc16is7xx_enable_ms,
 	.break_ctl	= sc16is7xx_break_ctl,
 	.startup	= sc16is7xx_startup,
 	.shutdown	= sc16is7xx_shutdown,
@@ -1281,7 +1469,9 @@ static int sc16is7xx_probe(struct device *dev,
 		s->p[i].port.uartclk	= freq;
 		s->p[i].port.rs485_config = sc16is7xx_config_rs485;
 		s->p[i].port.ops	= &sc16is7xx_ops;
+		s->p[i].old_mctrl	= 0;
 		s->p[i].port.line	= sc16is7xx_alloc_line();
+
 		if (s->p[i].port.line >= SC16IS7XX_MAX_DEVS) {
 			ret = -ENOMEM;
 			goto out_ports;
@@ -1293,9 +1483,17 @@ static int sc16is7xx_probe(struct device *dev,
 		sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_EFCR_REG,
 				     SC16IS7XX_EFCR_RXDISABLE_BIT |
 				     SC16IS7XX_EFCR_TXDISABLE_BIT);
+
+		/* Use GPIO lines as modem status registers */
+		if (devtype->has_mctrl)
+			sc16is7xx_port_write(&s->p[i].port,
+					     SC16IS7XX_IOCONTROL_REG,
+					     SC16IS7XX_IOCONTROL_MODEM_BIT);
+
 		/* Initialize kthread work structs */
 		kthread_init_work(&s->p[i].tx_work, sc16is7xx_tx_proc);
 		kthread_init_work(&s->p[i].reg_work, sc16is7xx_reg_proc);
+		kthread_init_delayed_work(&s->p[i].ms_work, sc16is7xx_ms_proc);
 		/* Register port */
 		uart_add_one_port(&sc16is7xx_uart, &s->p[i].port);
 
@@ -1379,6 +1577,7 @@ static void sc16is7xx_remove(struct device *dev)
 #endif
 
 	for (i = 0; i < s->devtype->nr_uart; i++) {
+		kthread_cancel_delayed_work_sync(&s->p[i].ms_work);
 		uart_remove_one_port(&sc16is7xx_uart, &s->p[i].port);
 		clear_bit(s->p[i].port.line, &sc16is7xx_lines);
 		sc16is7xx_power(&s->p[i].port, 0);
diff --git a/drivers/tty/serial/sccnxp.c b/drivers/tty/serial/sccnxp.c
index 10cc16a71f26..c56de2e104d4 100644
--- a/drivers/tty/serial/sccnxp.c
+++ b/drivers/tty/serial/sccnxp.c
@@ -828,7 +828,7 @@ static const struct uart_ops sccnxp_ops = {
 };
 
 #ifdef CONFIG_SERIAL_SCCNXP_CONSOLE
-static void sccnxp_console_putchar(struct uart_port *port, int c)
+static void sccnxp_console_putchar(struct uart_port *port, unsigned char c)
 {
 	int tryes = 100000;
 
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index b6223fab0687..d942ab152f5a 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -1277,6 +1277,7 @@ static void tegra_uart_set_termios(struct uart_port *u,
 	unsigned int baud;
 	unsigned long flags;
 	unsigned int lcr;
+	unsigned char char_bits;
 	int symb_bit = 1;
 	struct clk *parent_clk = clk_get_parent(tup->uart_clk);
 	unsigned long parent_clk_rate = clk_get_rate(parent_clk);
@@ -1316,25 +1317,10 @@ static void tegra_uart_set_termios(struct uart_port *u,
 		}
 	}
 
+	char_bits = tty_get_char_size(termios->c_cflag);
+	symb_bit += char_bits;
 	lcr &= ~UART_LCR_WLEN8;
-	switch (termios->c_cflag & CSIZE) {
-	case CS5:
-		lcr |= UART_LCR_WLEN5;
-		symb_bit += 5;
-		break;
-	case CS6:
-		lcr |= UART_LCR_WLEN6;
-		symb_bit += 6;
-		break;
-	case CS7:
-		lcr |= UART_LCR_WLEN7;
-		symb_bit += 7;
-		break;
-	default:
-		lcr |= UART_LCR_WLEN8;
-		symb_bit += 8;
-		break;
-	}
+	lcr |= UART_LCR_WLEN(char_bits);
 
 	/* Stop bits */
 	if (termios->c_cflag & CSTOPB) {
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 0db90be4c3bc..6a8963caf954 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -105,6 +105,7 @@ void uart_write_wakeup(struct uart_port *port)
 	BUG_ON(!state);
 	tty_port_tty_wakeup(&state->port);
 }
+EXPORT_SYMBOL(uart_write_wakeup);
 
 static void uart_stop(struct tty_struct *tty)
 {
@@ -316,8 +317,7 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 	state->xmit.buf = NULL;
 	uart_port_unlock(uport, flags);
 
-	if (xmit_buf)
-		free_page((unsigned long)xmit_buf);
+	free_page((unsigned long)xmit_buf);
 }
 
 /**
@@ -343,7 +343,6 @@ uart_update_timeout(struct uart_port *port, unsigned int cflag,
 	 */
 	port->timeout = (HZ * size) / baud + HZ/50;
 }
-
 EXPORT_SYMBOL(uart_update_timeout);
 
 /**
@@ -445,7 +444,6 @@ uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 	WARN_ON(1);
 	return 0;
 }
-
 EXPORT_SYMBOL(uart_get_baud_rate);
 
 /**
@@ -470,7 +468,6 @@ uart_get_divisor(struct uart_port *port, unsigned int baud)
 
 	return quot;
 }
-
 EXPORT_SYMBOL(uart_get_divisor);
 
 /* Caller holds port mutex */
@@ -645,6 +642,20 @@ static void uart_flush_buffer(struct tty_struct *tty)
 }
 
 /*
+ * This function performs low-level write of high-priority XON/XOFF
+ * character and accounting for it.
+ *
+ * Requires uart_port to implement .serial_out().
+ */
+void uart_xchar_out(struct uart_port *uport, int offset)
+{
+	serial_port_out(uport, offset, uport->x_char);
+	uport->icount.tx++;
+	uport->x_char = 0;
+}
+EXPORT_SYMBOL_GPL(uart_xchar_out);
+
+/*
  * This function is used to send a high-priority XON/XOFF character to
  * the device
  */
@@ -1571,8 +1582,7 @@ static void uart_tty_port_shutdown(struct tty_port *port)
 	state->xmit.buf = NULL;
 	spin_unlock_irq(&uport->lock);
 
-	if (buf)
-		free_page((unsigned long)buf);
+	free_page((unsigned long)buf);
 
 	uart_change_pm(state, UART_PM_STATE_OFF);
 }
@@ -1915,7 +1925,7 @@ static void uart_port_spin_lock_init(struct uart_port *port)
  */
 void uart_console_write(struct uart_port *port, const char *s,
 			unsigned int count,
-			void (*putchar)(struct uart_port *, int))
+			void (*putchar)(struct uart_port *, unsigned char))
 {
 	unsigned int i;
 
@@ -2207,6 +2217,7 @@ unlock:
 
 	return 0;
 }
+EXPORT_SYMBOL(uart_suspend_port);
 
 int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
 {
@@ -2292,6 +2303,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
 
 	return 0;
 }
+EXPORT_SYMBOL(uart_resume_port);
 
 static inline void
 uart_report_port(struct uart_driver *drv, struct uart_port *port)
@@ -2589,6 +2601,7 @@ out_kfree:
 out:
 	return retval;
 }
+EXPORT_SYMBOL(uart_register_driver);
 
 /**
  *	uart_unregister_driver - remove a driver from the uart core layer
@@ -2612,6 +2625,7 @@ void uart_unregister_driver(struct uart_driver *drv)
 	drv->state = NULL;
 	drv->tty_driver = NULL;
 }
+EXPORT_SYMBOL(uart_unregister_driver);
 
 struct tty_driver *uart_console_device(struct console *co, int *index)
 {
@@ -2946,6 +2960,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
 
 	return ret;
 }
+EXPORT_SYMBOL(uart_add_one_port);
 
 /**
  *	uart_remove_one_port - detach a driver defined port structure
@@ -3026,6 +3041,7 @@ out:
 
 	return ret;
 }
+EXPORT_SYMBOL(uart_remove_one_port);
 
 /*
  *	Are the two ports equivalent?
@@ -3202,14 +3218,6 @@ bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch)
 EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq);
 #endif
 
-EXPORT_SYMBOL(uart_write_wakeup);
-EXPORT_SYMBOL(uart_register_driver);
-EXPORT_SYMBOL(uart_unregister_driver);
-EXPORT_SYMBOL(uart_suspend_port);
-EXPORT_SYMBOL(uart_resume_port);
-EXPORT_SYMBOL(uart_add_one_port);
-EXPORT_SYMBOL(uart_remove_one_port);
-
 /**
  * uart_get_rs485_mode() - retrieve rs485 properties for given uart
  * @port: uart device's target port
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index c41d8911ce95..1663b3afc3a0 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -299,4 +299,42 @@ void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
 }
 EXPORT_SYMBOL_GPL(mctrl_gpio_disable_ms);
 
+void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios)
+{
+	enum mctrl_gpio_idx i;
+
+	if (!gpios)
+		return;
+
+	if (!gpios->mctrl_on)
+		return;
+
+	for (i = 0; i < UART_GPIO_MAX; ++i) {
+		if (!gpios->irq[i])
+			continue;
+
+		enable_irq_wake(gpios->irq[i]);
+	}
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_enable_irq_wake);
+
+void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios)
+{
+	enum mctrl_gpio_idx i;
+
+	if (!gpios)
+		return;
+
+	if (!gpios->mctrl_on)
+		return;
+
+	for (i = 0; i < UART_GPIO_MAX; ++i) {
+		if (!gpios->irq[i])
+			continue;
+
+		disable_irq_wake(gpios->irq[i]);
+	}
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_disable_irq_wake);
+
 MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/serial_mctrl_gpio.h b/drivers/tty/serial/serial_mctrl_gpio.h
index b134a0ffc894..fc76910fb105 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.h
+++ b/drivers/tty/serial/serial_mctrl_gpio.h
@@ -91,6 +91,16 @@ void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);
  */
 void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);
 
+/*
+ * Enable gpio wakeup interrupts to enable wake up source.
+ */
+void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios);
+
+/*
+ * Disable gpio wakeup interrupts to enable wake up source.
+ */
+void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios);
+
 #else /* GPIOLIB */
 
 static inline
@@ -142,6 +152,14 @@ static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
 {
 }
 
+static inline void mctrl_gpio_enable_irq_wake(struct mctrl_gpios *gpios)
+{
+}
+
+static inline void mctrl_gpio_disable_irq_wake(struct mctrl_gpios *gpios)
+{
+}
+
 #endif /* GPIOLIB */
 
 #endif
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index aaca4fe38486..2213e6b841d3 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -26,9 +26,6 @@
 
 #include <linux/io.h>
 
-static char *serial_version = "1.11";
-static char *serial_name = "TX39/49 Serial driver";
-
 #define PASS_LIMIT	256
 
 #if !defined(CONFIG_SERIAL_TXX9_STDSERIAL)
@@ -57,11 +54,6 @@ static char *serial_name = "TX39/49 Serial driver";
  */
 #define UART_NR  CONFIG_SERIAL_TXX9_NR_UARTS
 
-struct uart_txx9_port {
-	struct uart_port	port;
-	/* No additional info for now */
-};
-
 #define TXX9_REGION_SIZE	0x24
 
 /* TXX9 Serial Registers */
@@ -163,42 +155,42 @@ struct uart_txx9_port {
 #define TXX9_SIBGR_BCLK_T6	0x00000300
 #define TXX9_SIBGR_BRD_MASK	0x000000ff
 
-static inline unsigned int sio_in(struct uart_txx9_port *up, int offset)
+static inline unsigned int sio_in(struct uart_port *up, int offset)
 {
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		return __raw_readl(up->port.membase + offset);
+		return __raw_readl(up->membase + offset);
 	case UPIO_PORT:
-		return inl(up->port.iobase + offset);
+		return inl(up->iobase + offset);
 	}
 }
 
 static inline void
-sio_out(struct uart_txx9_port *up, int offset, int value)
+sio_out(struct uart_port *up, int offset, int value)
 {
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		__raw_writel(value, up->port.membase + offset);
+		__raw_writel(value, up->membase + offset);
 		break;
 	case UPIO_PORT:
-		outl(value, up->port.iobase + offset);
+		outl(value, up->iobase + offset);
 		break;
 	}
 }
 
 static inline void
-sio_mask(struct uart_txx9_port *up, int offset, unsigned int value)
+sio_mask(struct uart_port *up, int offset, unsigned int value)
 {
 	sio_out(up, offset, sio_in(up, offset) & ~value);
 }
 static inline void
-sio_set(struct uart_txx9_port *up, int offset, unsigned int value)
+sio_set(struct uart_port *up, int offset, unsigned int value)
 {
 	sio_out(up, offset, sio_in(up, offset) | value);
 }
 
 static inline void
-sio_quot_set(struct uart_txx9_port *up, int quot)
+sio_quot_set(struct uart_port *up, int quot)
 {
 	quot >>= 1;
 	if (quot < 256)
@@ -213,32 +205,23 @@ sio_quot_set(struct uart_txx9_port *up, int quot)
 		sio_out(up, TXX9_SIBGR, 0xff | TXX9_SIBGR_BCLK_T6);
 }
 
-static struct uart_txx9_port *to_uart_txx9_port(struct uart_port *port)
-{
-	return container_of(port, struct uart_txx9_port, port);
-}
-
-static void serial_txx9_stop_tx(struct uart_port *port)
+static void serial_txx9_stop_tx(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	sio_mask(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
 }
 
-static void serial_txx9_start_tx(struct uart_port *port)
+static void serial_txx9_start_tx(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	sio_set(up, TXX9_SIDICR, TXX9_SIDICR_TIE);
 }
 
-static void serial_txx9_stop_rx(struct uart_port *port)
+static void serial_txx9_stop_rx(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
-	up->port.read_status_mask &= ~TXX9_SIDISR_RDIS;
+	up->read_status_mask &= ~TXX9_SIDISR_RDIS;
 }
 
-static void serial_txx9_initialize(struct uart_port *port)
+static void serial_txx9_initialize(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned int tmout = 10000;
 
 	sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST);
@@ -253,15 +236,15 @@ static void serial_txx9_initialize(struct uart_port *port)
 	/* initial settings */
 	sio_out(up, TXX9_SILCR,
 		TXX9_SILCR_UMODE_8BIT | TXX9_SILCR_USBL_1BIT |
-		((up->port.flags & UPF_TXX9_USE_SCLK) ?
+		((up->flags & UPF_TXX9_USE_SCLK) ?
 		 TXX9_SILCR_SCS_SCLK_BG : TXX9_SILCR_SCS_IMCLK_BG));
-	sio_quot_set(up, uart_get_divisor(port, 9600));
+	sio_quot_set(up, uart_get_divisor(up, 9600));
 	sio_out(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSTL_MAX /* 15 */);
 	sio_out(up, TXX9_SIDICR, 0);
 }
 
 static inline void
-receive_chars(struct uart_txx9_port *up, unsigned int *status)
+receive_chars(struct uart_port *up, unsigned int *status)
 {
 	unsigned char ch;
 	unsigned int disr = *status;
@@ -272,11 +255,11 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 	do {
 		ch = sio_in(up, TXX9_SIRFIFO);
 		flag = TTY_NORMAL;
-		up->port.icount.rx++;
+		up->icount.rx++;
 
 		/* mask out RFDN_MASK bit added by previous overrun */
 		next_ignore_status_mask =
-			up->port.ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
+			up->ignore_status_mask & ~TXX9_SIDISR_RFDN_MASK;
 		if (unlikely(disr & (TXX9_SIDISR_UBRK | TXX9_SIDISR_UPER |
 				     TXX9_SIDISR_UFER | TXX9_SIDISR_UOER))) {
 			/*
@@ -284,21 +267,21 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 			 */
 			if (disr & TXX9_SIDISR_UBRK) {
 				disr &= ~(TXX9_SIDISR_UFER | TXX9_SIDISR_UPER);
-				up->port.icount.brk++;
+				up->icount.brk++;
 				/*
 				 * We do the SysRQ and SAK checking
 				 * here because otherwise the break
 				 * may get masked by ignore_status_mask
 				 * or read_status_mask.
 				 */
-				if (uart_handle_break(&up->port))
+				if (uart_handle_break(up))
 					goto ignore_char;
 			} else if (disr & TXX9_SIDISR_UPER)
-				up->port.icount.parity++;
+				up->icount.parity++;
 			else if (disr & TXX9_SIDISR_UFER)
-				up->port.icount.frame++;
+				up->icount.frame++;
 			if (disr & TXX9_SIDISR_UOER) {
-				up->port.icount.overrun++;
+				up->icount.overrun++;
 				/*
 				 * The receiver read buffer still hold
 				 * a char which caused overrun.
@@ -312,7 +295,7 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 			/*
 			 * Mask off conditions which should be ingored.
 			 */
-			disr &= up->port.read_status_mask;
+			disr &= up->read_status_mask;
 
 			if (disr & TXX9_SIDISR_UBRK) {
 				flag = TTY_BREAK;
@@ -321,34 +304,34 @@ receive_chars(struct uart_txx9_port *up, unsigned int *status)
 			else if (disr & TXX9_SIDISR_UFER)
 				flag = TTY_FRAME;
 		}
-		if (uart_handle_sysrq_char(&up->port, ch))
+		if (uart_handle_sysrq_char(up, ch))
 			goto ignore_char;
 
-		uart_insert_char(&up->port, disr, TXX9_SIDISR_UOER, ch, flag);
+		uart_insert_char(up, disr, TXX9_SIDISR_UOER, ch, flag);
 
 	ignore_char:
-		up->port.ignore_status_mask = next_ignore_status_mask;
+		up->ignore_status_mask = next_ignore_status_mask;
 		disr = sio_in(up, TXX9_SIDISR);
 	} while (!(disr & TXX9_SIDISR_UVALID) && (max_count-- > 0));
 
-	tty_flip_buffer_push(&up->port.state->port);
+	tty_flip_buffer_push(&up->state->port);
 
 	*status = disr;
 }
 
-static inline void transmit_chars(struct uart_txx9_port *up)
+static inline void transmit_chars(struct uart_port *up)
 {
-	struct circ_buf *xmit = &up->port.state->xmit;
+	struct circ_buf *xmit = &up->state->xmit;
 	int count;
 
-	if (up->port.x_char) {
-		sio_out(up, TXX9_SITFIFO, up->port.x_char);
-		up->port.icount.tx++;
-		up->port.x_char = 0;
+	if (up->x_char) {
+		sio_out(up, TXX9_SITFIFO, up->x_char);
+		up->icount.tx++;
+		up->x_char = 0;
 		return;
 	}
-	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
-		serial_txx9_stop_tx(&up->port);
+	if (uart_circ_empty(xmit) || uart_tx_stopped(up)) {
+		serial_txx9_stop_tx(up);
 		return;
 	}
 
@@ -356,32 +339,32 @@ static inline void transmit_chars(struct uart_txx9_port *up)
 	do {
 		sio_out(up, TXX9_SITFIFO, xmit->buf[xmit->tail]);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
-		up->port.icount.tx++;
+		up->icount.tx++;
 		if (uart_circ_empty(xmit))
 			break;
 	} while (--count > 0);
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
-		uart_write_wakeup(&up->port);
+		uart_write_wakeup(up);
 
 	if (uart_circ_empty(xmit))
-		serial_txx9_stop_tx(&up->port);
+		serial_txx9_stop_tx(up);
 }
 
 static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
 {
 	int pass_counter = 0;
-	struct uart_txx9_port *up = dev_id;
+	struct uart_port *up = dev_id;
 	unsigned int status;
 
 	while (1) {
-		spin_lock(&up->port.lock);
+		spin_lock(&up->lock);
 		status = sio_in(up, TXX9_SIDISR);
 		if (!(sio_in(up, TXX9_SIDICR) & TXX9_SIDICR_TIE))
 			status &= ~TXX9_SIDISR_TDIS;
 		if (!(status & (TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
 				TXX9_SIDISR_TOUT))) {
-			spin_unlock(&up->port.lock);
+			spin_unlock(&up->lock);
 			break;
 		}
 
@@ -393,7 +376,7 @@ static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
 		sio_mask(up, TXX9_SIDISR,
 			 TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS |
 			 TXX9_SIDISR_TOUT);
-		spin_unlock(&up->port.lock);
+		spin_unlock(&up->lock);
 
 		if (pass_counter++ > PASS_LIMIT)
 			break;
@@ -402,22 +385,20 @@ static irqreturn_t serial_txx9_interrupt(int irq, void *dev_id)
 	return pass_counter ? IRQ_HANDLED : IRQ_NONE;
 }
 
-static unsigned int serial_txx9_tx_empty(struct uart_port *port)
+static unsigned int serial_txx9_tx_empty(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 	unsigned int ret;
 
-	spin_lock_irqsave(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
 	ret = (sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS) ? TIOCSER_TEMT : 0;
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_unlock_irqrestore(&up->lock, flags);
 
 	return ret;
 }
 
-static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
+static unsigned int serial_txx9_get_mctrl(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned int ret;
 
 	/* no modem control lines */
@@ -428,9 +409,8 @@ static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
 	return ret;
 }
 
-static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
+static void serial_txx9_set_mctrl(struct uart_port *up, unsigned int mctrl)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 
 	if (mctrl & TIOCM_RTS)
 		sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
@@ -438,24 +418,23 @@ static void serial_txx9_set_mctrl(struct uart_port *port, unsigned int mctrl)
 		sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RTSSC);
 }
 
-static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
+static void serial_txx9_break_ctl(struct uart_port *up, int break_state)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 
-	spin_lock_irqsave(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
 	if (break_state == -1)
 		sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
 	else
 		sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_unlock_irqrestore(&up->lock, flags);
 }
 
 #if defined(CONFIG_SERIAL_TXX9_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
 /*
  *	Wait for transmitter & holding register to empty
  */
-static void wait_for_xmitr(struct uart_txx9_port *up)
+static void wait_for_xmitr(struct uart_port *up)
 {
 	unsigned int tmout = 10000;
 
@@ -465,7 +444,7 @@ static void wait_for_xmitr(struct uart_txx9_port *up)
 		udelay(1);
 
 	/* Wait up to 1s for flow control if necessary */
-	if (up->port.flags & UPF_CONS_FLOW) {
+	if (up->flags & UPF_CONS_FLOW) {
 		tmout = 1000000;
 		while (--tmout &&
 		       (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
@@ -480,11 +459,10 @@ static void wait_for_xmitr(struct uart_txx9_port *up)
  * in an interrupt or debug context.
  */
 
-static int serial_txx9_get_poll_char(struct uart_port *port)
+static int serial_txx9_get_poll_char(struct uart_port *up)
 {
 	unsigned int ier;
 	unsigned char c;
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 
 	/*
 	 *	First save the IER then disable the interrupts
@@ -507,10 +485,9 @@ static int serial_txx9_get_poll_char(struct uart_port *port)
 }
 
 
-static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
+static void serial_txx9_put_poll_char(struct uart_port *up, unsigned char c)
 {
 	unsigned int ier;
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 
 	/*
 	 *	First save the IER then disable the interrupts
@@ -534,9 +511,8 @@ static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
 
 #endif /* CONFIG_CONSOLE_POLL */
 
-static int serial_txx9_startup(struct uart_port *port)
+static int serial_txx9_startup(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 	int retval;
 
@@ -556,7 +532,7 @@ static int serial_txx9_startup(struct uart_port *port)
 	 */
 	sio_out(up, TXX9_SIDISR, 0);
 
-	retval = request_irq(up->port.irq, serial_txx9_interrupt,
+	retval = request_irq(up->irq, serial_txx9_interrupt,
 			     IRQF_SHARED, "serial_txx9", up);
 	if (retval)
 		return retval;
@@ -564,9 +540,9 @@ static int serial_txx9_startup(struct uart_port *port)
 	/*
 	 * Now, initialize the UART
 	 */
-	spin_lock_irqsave(&up->port.lock, flags);
-	serial_txx9_set_mctrl(&up->port, up->port.mctrl);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
+	serial_txx9_set_mctrl(up, up->mctrl);
+	spin_unlock_irqrestore(&up->lock, flags);
 
 	/* Enable RX/TX */
 	sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
@@ -579,9 +555,8 @@ static int serial_txx9_startup(struct uart_port *port)
 	return 0;
 }
 
-static void serial_txx9_shutdown(struct uart_port *port)
+static void serial_txx9_shutdown(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned long flags;
 
 	/*
@@ -589,9 +564,9 @@ static void serial_txx9_shutdown(struct uart_port *port)
 	 */
 	sio_out(up, TXX9_SIDICR, 0);	/* disable all intrs */
 
-	spin_lock_irqsave(&up->port.lock, flags);
-	serial_txx9_set_mctrl(&up->port, up->port.mctrl);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
+	serial_txx9_set_mctrl(up, up->mctrl);
+	spin_unlock_irqrestore(&up->lock, flags);
 
 	/*
 	 * Disable break condition
@@ -599,8 +574,8 @@ static void serial_txx9_shutdown(struct uart_port *port)
 	sio_mask(up, TXX9_SIFLCR, TXX9_SIFLCR_TBRK);
 
 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
-	if (up->port.cons && up->port.line == up->port.cons->index) {
-		free_irq(up->port.irq, up);
+	if (up->cons && up->line == up->cons->index) {
+		free_irq(up->irq, up);
 		return;
 	}
 #endif
@@ -614,14 +589,13 @@ static void serial_txx9_shutdown(struct uart_port *port)
 	/* Disable RX/TX */
 	sio_set(up, TXX9_SIFLCR, TXX9_SIFLCR_RSDE | TXX9_SIFLCR_TSDE);
 
-	free_irq(up->port.irq, up);
+	free_irq(up->irq, up);
 }
 
 static void
-serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
+serial_txx9_set_termios(struct uart_port *up, struct ktermios *termios,
 		       struct ktermios *old)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	unsigned int cval, fcr = 0;
 	unsigned long flags;
 	unsigned int baud, quot;
@@ -661,8 +635,8 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16/2);
-	quot = uart_get_divisor(port, baud);
+	baud = uart_get_baud_rate(up, termios, old, 0, up->uartclk/16/2);
+	quot = uart_get_divisor(up, baud);
 
 	/* Set up FIFOs */
 	/* TX Int by FIFO Empty, RX Int by Receiving 1 char. */
@@ -672,45 +646,45 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
 	 * Ok, we're now changing the port state.  Do it with
 	 * interrupts disabled.
 	 */
-	spin_lock_irqsave(&up->port.lock, flags);
+	spin_lock_irqsave(&up->lock, flags);
 
 	/*
 	 * Update the per-port timeout.
 	 */
-	uart_update_timeout(port, termios->c_cflag, baud);
+	uart_update_timeout(up, termios->c_cflag, baud);
 
-	up->port.read_status_mask = TXX9_SIDISR_UOER |
+	up->read_status_mask = TXX9_SIDISR_UOER |
 		TXX9_SIDISR_TDIS | TXX9_SIDISR_RDIS;
 	if (termios->c_iflag & INPCK)
-		up->port.read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
+		up->read_status_mask |= TXX9_SIDISR_UFER | TXX9_SIDISR_UPER;
 	if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
-		up->port.read_status_mask |= TXX9_SIDISR_UBRK;
+		up->read_status_mask |= TXX9_SIDISR_UBRK;
 
 	/*
 	 * Characteres to ignore
 	 */
-	up->port.ignore_status_mask = 0;
+	up->ignore_status_mask = 0;
 	if (termios->c_iflag & IGNPAR)
-		up->port.ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
+		up->ignore_status_mask |= TXX9_SIDISR_UPER | TXX9_SIDISR_UFER;
 	if (termios->c_iflag & IGNBRK) {
-		up->port.ignore_status_mask |= TXX9_SIDISR_UBRK;
+		up->ignore_status_mask |= TXX9_SIDISR_UBRK;
 		/*
 		 * If we're ignoring parity and break indicators,
 		 * ignore overruns too (for real raw support).
 		 */
 		if (termios->c_iflag & IGNPAR)
-			up->port.ignore_status_mask |= TXX9_SIDISR_UOER;
+			up->ignore_status_mask |= TXX9_SIDISR_UOER;
 	}
 
 	/*
 	 * ignore all characters if CREAD is not set
 	 */
 	if ((termios->c_cflag & CREAD) == 0)
-		up->port.ignore_status_mask |= TXX9_SIDISR_RDIS;
+		up->ignore_status_mask |= TXX9_SIDISR_RDIS;
 
 	/* CTS flow control flag */
 	if ((termios->c_cflag & CRTSCTS) &&
-	    (up->port.flags & UPF_TXX9_HAVE_CTS_LINE)) {
+	    (up->flags & UPF_TXX9_HAVE_CTS_LINE)) {
 		sio_set(up, TXX9_SIFLCR,
 			TXX9_SIFLCR_RCS | TXX9_SIFLCR_TES);
 	} else {
@@ -722,8 +696,8 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
 	sio_quot_set(up, quot);
 	sio_out(up, TXX9_SIFCR, fcr);
 
-	serial_txx9_set_mctrl(&up->port, up->port.mctrl);
-	spin_unlock_irqrestore(&up->port.lock, flags);
+	serial_txx9_set_mctrl(up, up->mctrl);
+	spin_unlock_irqrestore(&up->lock, flags);
 }
 
 static void
@@ -742,76 +716,73 @@ serial_txx9_pm(struct uart_port *port, unsigned int state,
 		serial_txx9_initialize(port);
 }
 
-static int serial_txx9_request_resource(struct uart_txx9_port *up)
+static int serial_txx9_request_resource(struct uart_port *up)
 {
 	unsigned int size = TXX9_REGION_SIZE;
 	int ret = 0;
 
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		if (!up->port.mapbase)
+		if (!up->mapbase)
 			break;
 
-		if (!request_mem_region(up->port.mapbase, size, "serial_txx9")) {
+		if (!request_mem_region(up->mapbase, size, "serial_txx9")) {
 			ret = -EBUSY;
 			break;
 		}
 
-		if (up->port.flags & UPF_IOREMAP) {
-			up->port.membase = ioremap(up->port.mapbase, size);
-			if (!up->port.membase) {
-				release_mem_region(up->port.mapbase, size);
+		if (up->flags & UPF_IOREMAP) {
+			up->membase = ioremap(up->mapbase, size);
+			if (!up->membase) {
+				release_mem_region(up->mapbase, size);
 				ret = -ENOMEM;
 			}
 		}
 		break;
 
 	case UPIO_PORT:
-		if (!request_region(up->port.iobase, size, "serial_txx9"))
+		if (!request_region(up->iobase, size, "serial_txx9"))
 			ret = -EBUSY;
 		break;
 	}
 	return ret;
 }
 
-static void serial_txx9_release_resource(struct uart_txx9_port *up)
+static void serial_txx9_release_resource(struct uart_port *up)
 {
 	unsigned int size = TXX9_REGION_SIZE;
 
-	switch (up->port.iotype) {
+	switch (up->iotype) {
 	default:
-		if (!up->port.mapbase)
+		if (!up->mapbase)
 			break;
 
-		if (up->port.flags & UPF_IOREMAP) {
-			iounmap(up->port.membase);
-			up->port.membase = NULL;
+		if (up->flags & UPF_IOREMAP) {
+			iounmap(up->membase);
+			up->membase = NULL;
 		}
 
-		release_mem_region(up->port.mapbase, size);
+		release_mem_region(up->mapbase, size);
 		break;
 
 	case UPIO_PORT:
-		release_region(up->port.iobase, size);
+		release_region(up->iobase, size);
 		break;
 	}
 }
 
-static void serial_txx9_release_port(struct uart_port *port)
+static void serial_txx9_release_port(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	serial_txx9_release_resource(up);
 }
 
-static int serial_txx9_request_port(struct uart_port *port)
+static int serial_txx9_request_port(struct uart_port *up)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	return serial_txx9_request_resource(up);
 }
 
-static void serial_txx9_config_port(struct uart_port *port, int uflags)
+static void serial_txx9_config_port(struct uart_port *up, int uflags)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
 	int ret;
 
 	/*
@@ -821,14 +792,14 @@ static void serial_txx9_config_port(struct uart_port *port, int uflags)
 	ret = serial_txx9_request_resource(up);
 	if (ret < 0)
 		return;
-	port->type = PORT_TXX9;
-	up->port.fifosize = TXX9_SIO_TX_FIFO;
+	up->type = PORT_TXX9;
+	up->fifosize = TXX9_SIO_TX_FIFO;
 
 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
-	if (up->port.line == up->port.cons->index)
+	if (up->line == up->cons->index)
 		return;
 #endif
-	serial_txx9_initialize(port);
+	serial_txx9_initialize(up);
 }
 
 static const char *
@@ -859,7 +830,7 @@ static const struct uart_ops serial_txx9_pops = {
 #endif
 };
 
-static struct uart_txx9_port serial_txx9_ports[UART_NR];
+static struct uart_port serial_txx9_ports[UART_NR];
 
 static void __init serial_txx9_register_ports(struct uart_driver *drv,
 					      struct device *dev)
@@ -867,22 +838,20 @@ static void __init serial_txx9_register_ports(struct uart_driver *drv,
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		up->port.line = i;
-		up->port.ops = &serial_txx9_pops;
-		up->port.dev = dev;
-		if (up->port.iobase || up->port.mapbase)
-			uart_add_one_port(drv, &up->port);
+		up->line = i;
+		up->ops = &serial_txx9_pops;
+		up->dev = dev;
+		if (up->iobase || up->mapbase)
+			uart_add_one_port(drv, up);
 	}
 }
 
 #ifdef CONFIG_SERIAL_TXX9_CONSOLE
 
-static void serial_txx9_console_putchar(struct uart_port *port, int ch)
+static void serial_txx9_console_putchar(struct uart_port *up, unsigned char ch)
 {
-	struct uart_txx9_port *up = to_uart_txx9_port(port);
-
 	wait_for_xmitr(up);
 	sio_out(up, TXX9_SITFIFO, ch);
 }
@@ -896,7 +865,7 @@ static void serial_txx9_console_putchar(struct uart_port *port, int ch)
 static void
 serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
 {
-	struct uart_txx9_port *up = &serial_txx9_ports[co->index];
+	struct uart_port *up = &serial_txx9_ports[co->index];
 	unsigned int ier, flcr;
 
 	/*
@@ -908,10 +877,10 @@ serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
 	 *	Disable flow-control if enabled (and unnecessary)
 	 */
 	flcr = sio_in(up, TXX9_SIFLCR);
-	if (!(up->port.flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
+	if (!(up->flags & UPF_CONS_FLOW) && (flcr & TXX9_SIFLCR_TES))
 		sio_out(up, TXX9_SIFLCR, flcr & ~TXX9_SIFLCR_TES);
 
-	uart_console_write(&up->port, s, count, serial_txx9_console_putchar);
+	uart_console_write(up, s, count, serial_txx9_console_putchar);
 
 	/*
 	 *	Finally, wait for transmitter to become empty
@@ -924,8 +893,7 @@ serial_txx9_console_write(struct console *co, const char *s, unsigned int count)
 
 static int __init serial_txx9_console_setup(struct console *co, char *options)
 {
-	struct uart_port *port;
-	struct uart_txx9_port *up;
+	struct uart_port *up;
 	int baud = 9600;
 	int bits = 8;
 	int parity = 'n';
@@ -939,16 +907,15 @@ static int __init serial_txx9_console_setup(struct console *co, char *options)
 	if (co->index >= UART_NR)
 		co->index = 0;
 	up = &serial_txx9_ports[co->index];
-	port = &up->port;
-	if (!port->ops)
+	if (!up->ops)
 		return -ENODEV;
 
-	serial_txx9_initialize(&up->port);
+	serial_txx9_initialize(up);
 
 	if (options)
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
 
-	return uart_set_options(port, co, baud, parity, bits, flow);
+	return uart_set_options(up, co, baud, parity, bits, flow);
 }
 
 static struct uart_driver serial_txx9_reg;
@@ -989,9 +956,9 @@ int __init early_serial_txx9_setup(struct uart_port *port)
 	if (port->line >= ARRAY_SIZE(serial_txx9_ports))
 		return -ENODEV;
 
-	serial_txx9_ports[port->line].port = *port;
-	serial_txx9_ports[port->line].port.ops = &serial_txx9_pops;
-	serial_txx9_ports[port->line].port.flags |=
+	serial_txx9_ports[port->line] = *port;
+	serial_txx9_ports[port->line].ops = &serial_txx9_pops;
+	serial_txx9_ports[port->line].flags |=
 		UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
 	return 0;
 }
@@ -1012,14 +979,14 @@ static DEFINE_MUTEX(serial_txx9_mutex);
 static int serial_txx9_register_port(struct uart_port *port)
 {
 	int i;
-	struct uart_txx9_port *uart;
+	struct uart_port *uart;
 	int ret = -ENOSPC;
 
 	mutex_lock(&serial_txx9_mutex);
 	for (i = 0; i < UART_NR; i++) {
 		uart = &serial_txx9_ports[i];
-		if (uart_match_port(&uart->port, port)) {
-			uart_remove_one_port(&serial_txx9_reg, &uart->port);
+		if (uart_match_port(uart, port)) {
+			uart_remove_one_port(&serial_txx9_reg, uart);
 			break;
 		}
 	}
@@ -1027,24 +994,24 @@ static int serial_txx9_register_port(struct uart_port *port)
 		/* Find unused port */
 		for (i = 0; i < UART_NR; i++) {
 			uart = &serial_txx9_ports[i];
-			if (!(uart->port.iobase || uart->port.mapbase))
+			if (!(uart->iobase || uart->mapbase))
 				break;
 		}
 	}
 	if (i < UART_NR) {
-		uart->port.iobase = port->iobase;
-		uart->port.membase = port->membase;
-		uart->port.irq      = port->irq;
-		uart->port.uartclk  = port->uartclk;
-		uart->port.iotype   = port->iotype;
-		uart->port.flags    = port->flags
+		uart->iobase = port->iobase;
+		uart->membase = port->membase;
+		uart->irq      = port->irq;
+		uart->uartclk  = port->uartclk;
+		uart->iotype   = port->iotype;
+		uart->flags    = port->flags
 			| UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
-		uart->port.mapbase  = port->mapbase;
+		uart->mapbase  = port->mapbase;
 		if (port->dev)
-			uart->port.dev = port->dev;
-		ret = uart_add_one_port(&serial_txx9_reg, &uart->port);
+			uart->dev = port->dev;
+		ret = uart_add_one_port(&serial_txx9_reg, uart);
 		if (ret == 0)
-			ret = uart->port.line;
+			ret = uart->line;
 	}
 	mutex_unlock(&serial_txx9_mutex);
 	return ret;
@@ -1059,16 +1026,16 @@ static int serial_txx9_register_port(struct uart_port *port)
  */
 static void serial_txx9_unregister_port(int line)
 {
-	struct uart_txx9_port *uart = &serial_txx9_ports[line];
+	struct uart_port *uart = &serial_txx9_ports[line];
 
 	mutex_lock(&serial_txx9_mutex);
-	uart_remove_one_port(&serial_txx9_reg, &uart->port);
-	uart->port.flags = 0;
-	uart->port.type = PORT_UNKNOWN;
-	uart->port.iobase = 0;
-	uart->port.mapbase = 0;
-	uart->port.membase = NULL;
-	uart->port.dev = NULL;
+	uart_remove_one_port(&serial_txx9_reg, uart);
+	uart->flags = 0;
+	uart->type = PORT_UNKNOWN;
+	uart->iobase = 0;
+	uart->mapbase = 0;
+	uart->membase = NULL;
+	uart->dev = NULL;
 	mutex_unlock(&serial_txx9_mutex);
 }
 
@@ -1111,9 +1078,9 @@ static int serial_txx9_remove(struct platform_device *dev)
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		if (up->port.dev == &dev->dev)
+		if (up->dev == &dev->dev)
 			serial_txx9_unregister_port(i);
 	}
 	return 0;
@@ -1125,10 +1092,10 @@ static int serial_txx9_suspend(struct platform_device *dev, pm_message_t state)
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
-			uart_suspend_port(&serial_txx9_reg, &up->port);
+		if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
+			uart_suspend_port(&serial_txx9_reg, up);
 	}
 
 	return 0;
@@ -1139,10 +1106,10 @@ static int serial_txx9_resume(struct platform_device *dev)
 	int i;
 
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
+		struct uart_port *up = &serial_txx9_ports[i];
 
-		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
-			uart_resume_port(&serial_txx9_reg, &up->port);
+		if (up->type != PORT_UNKNOWN && up->dev == &dev->dev)
+			uart_resume_port(&serial_txx9_reg, up);
 	}
 
 	return 0;
@@ -1198,10 +1165,10 @@ pciserial_txx9_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
 
 static void pciserial_txx9_remove_one(struct pci_dev *dev)
 {
-	struct uart_txx9_port *up = pci_get_drvdata(dev);
+	struct uart_port *up = pci_get_drvdata(dev);
 
 	if (up) {
-		serial_txx9_unregister_port(up->port.line);
+		serial_txx9_unregister_port(up->line);
 		pci_disable_device(dev);
 	}
 }
@@ -1209,10 +1176,10 @@ static void pciserial_txx9_remove_one(struct pci_dev *dev)
 #ifdef CONFIG_PM
 static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
 {
-	struct uart_txx9_port *up = pci_get_drvdata(dev);
+	struct uart_port *up = pci_get_drvdata(dev);
 
 	if (up)
-		uart_suspend_port(&serial_txx9_reg, &up->port);
+		uart_suspend_port(&serial_txx9_reg, up);
 	pci_save_state(dev);
 	pci_set_power_state(dev, pci_choose_state(dev, state));
 	return 0;
@@ -1220,12 +1187,12 @@ static int pciserial_txx9_suspend_one(struct pci_dev *dev, pm_message_t state)
 
 static int pciserial_txx9_resume_one(struct pci_dev *dev)
 {
-	struct uart_txx9_port *up = pci_get_drvdata(dev);
+	struct uart_port *up = pci_get_drvdata(dev);
 
 	pci_set_power_state(dev, PCI_D0);
 	pci_restore_state(dev);
 	if (up)
-		uart_resume_port(&serial_txx9_reg, &up->port);
+		uart_resume_port(&serial_txx9_reg, up);
 	return 0;
 }
 #endif
@@ -1255,8 +1222,6 @@ static int __init serial_txx9_init(void)
 {
 	int ret;
 
- 	printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
-
 	ret = uart_register_driver(&serial_txx9_reg);
 	if (ret)
 		goto out;
@@ -1307,9 +1272,9 @@ static void __exit serial_txx9_exit(void)
 	platform_driver_unregister(&serial_txx9_plat_driver);
 	platform_device_unregister(serial_txx9_plat_devs);
 	for (i = 0; i < UART_NR; i++) {
-		struct uart_txx9_port *up = &serial_txx9_ports[i];
-		if (up->port.iobase || up->port.mapbase)
-			uart_remove_one_port(&serial_txx9_reg, &up->port);
+		struct uart_port *up = &serial_txx9_ports[i];
+		if (up->iobase || up->mapbase)
+			uart_remove_one_port(&serial_txx9_reg, up);
 	}
 
 	uart_unregister_driver(&serial_txx9_reg);
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 968967d722d4..0f9b8bd23500 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2293,7 +2293,7 @@ static int sci_scbrr_calc(struct sci_port *s, unsigned int bps,
 	for_each_sr(sr, s) {
 		for (c = 0; c <= 3; c++) {
 			/* integerized formulas from HSCIF documentation */
-			prediv = sr * (1 << (2 * c + 1));
+			prediv = sr << (2 * c + 1);
 
 			/*
 			 * We need to calculate:
@@ -2960,7 +2960,7 @@ static void sci_cleanup_single(struct sci_port *port)
 
 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || \
     defined(CONFIG_SERIAL_SH_SCI_EARLYCON)
-static void serial_console_putchar(struct uart_port *port, int ch)
+static void serial_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	sci_poll_put_char(port, ch);
 }
diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
index b79900d0e91a..f5ac14c384c4 100644
--- a/drivers/tty/serial/sifive.c
+++ b/drivers/tty/serial/sifive.c
@@ -756,7 +756,7 @@ static void sifive_serial_poll_put_char(struct uart_port *port,
  */
 
 #ifdef CONFIG_SERIAL_EARLYCON
-static void early_sifive_serial_putc(struct uart_port *port, int c)
+static void early_sifive_serial_putc(struct uart_port *port, unsigned char c)
 {
 	while (__ssp_early_readl(port, SIFIVE_SERIAL_TXDATA_OFFS) &
 	       SIFIVE_SERIAL_TXDATA_FULL_MASK)
@@ -800,7 +800,7 @@ OF_EARLYCON_DECLARE(sifive, "sifive,fu540-c000-uart0",
 
 static struct sifive_serial_port *sifive_serial_console_ports[SIFIVE_SERIAL_MAX_PORTS];
 
-static void sifive_serial_console_putchar(struct uart_port *port, int ch)
+static void sifive_serial_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct sifive_serial_port *ssp = port_to_sifive_serial_port(port);
 
diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 9a7ae6384edf..4329b9c9cbf0 100644
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -984,7 +984,7 @@ static void wait_for_xmitr(struct uart_port *port)
 	} while (status & SPRD_TX_FIFO_CNT_MASK);
 }
 
-static void sprd_console_putchar(struct uart_port *port, int ch)
+static void sprd_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	wait_for_xmitr(port);
 	serial_out(port, SPRD_TXD, ch);
@@ -1058,7 +1058,7 @@ console_initcall(sprd_serial_console_init);
 #define SPRD_CONSOLE	(&sprd_console)
 
 /* Support for earlycon */
-static void sprd_putc(struct uart_port *port, int c)
+static void sprd_putc(struct uart_port *port, unsigned char c)
 {
 	unsigned int timeout = SPRD_TIMEOUT;
 
diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index 87e480cc8206..d7fd692286cf 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -854,7 +854,7 @@ static int asc_serial_resume(struct device *dev)
 /*----------------------------------------------------------------------*/
 
 #ifdef CONFIG_SERIAL_ST_ASC_CONSOLE
-static void asc_console_putchar(struct uart_port *port, int ch)
+static void asc_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	unsigned int timeout = 1000000;
 
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 9570002d07e7..87b5cd4c9743 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1641,7 +1641,7 @@ static int stm32_usart_serial_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_SERIAL_STM32_CONSOLE
-static void stm32_usart_console_putchar(struct uart_port *port, int ch)
+static void stm32_usart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct stm32_port *stm32_port = to_stm32_port(port);
 	const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -1756,6 +1756,7 @@ static int __maybe_unused stm32_usart_serial_en_wakeup(struct uart_port *port,
 	if (enable) {
 		stm32_usart_set_bits(port, ofs->cr1, USART_CR1_UESM);
 		stm32_usart_set_bits(port, ofs->cr3, USART_CR3_WUFIE);
+		mctrl_gpio_enable_irq_wake(stm32_port->gpios);
 
 		/*
 		 * When DMA is used for reception, it must be disabled before
@@ -1782,7 +1783,7 @@ static int __maybe_unused stm32_usart_serial_en_wakeup(struct uart_port *port,
 			if (ret)
 				return ret;
 		}
-
+		mctrl_gpio_disable_irq_wake(stm32_port->gpios);
 		stm32_usart_clr_bits(port, ofs->cr1, USART_CR1_UESM);
 		stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_WUFIE);
 	}
diff --git a/drivers/tty/serial/sunplus-uart.c b/drivers/tty/serial/sunplus-uart.c
new file mode 100644
index 000000000000..9f15922e681b
--- /dev/null
+++ b/drivers/tty/serial/sunplus-uart.c
@@ -0,0 +1,775 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sunplus SoC UART driver
+ *
+ * Author: Hammer Hsieh <hammerh0314@gmail.com>
+ *
+ * Note1: This driver is 8250-like uart, but are not register compatible.
+ *
+ * Note2: On some buses, for preventing data incoherence, must do a read
+ * for ensure write made it to hardware. In this driver, function startup
+ * and shutdown did not do a read but only do a write directly. For what?
+ * In Sunplus bus communication between memory bus and peripheral bus with
+ * posted write, it will send a specific command after last write command
+ * to make sure write done. Then memory bus identify the specific command
+ * and send done signal back to master device. After master device received
+ * done signal, then proceed next write command. It is no need to do a read
+ * before write.
+ */
+#include <linux/clk.h>
+#include <linux/console.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/sysrq.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <asm/irq.h>
+
+/* Register offsets */
+#define SUP_UART_DATA			0x00
+#define SUP_UART_LSR			0x04
+#define SUP_UART_MSR			0x08
+#define SUP_UART_LCR			0x0C
+#define SUP_UART_MCR			0x10
+#define SUP_UART_DIV_L			0x14
+#define SUP_UART_DIV_H			0x18
+#define SUP_UART_ISC			0x1C
+#define SUP_UART_TX_RESIDUE		0x20
+#define SUP_UART_RX_RESIDUE		0x24
+
+/* Line Status Register bits */
+#define SUP_UART_LSR_BC			BIT(5) /* break condition status */
+#define SUP_UART_LSR_FE			BIT(4) /* frame error status */
+#define SUP_UART_LSR_OE			BIT(3) /* overrun error status */
+#define SUP_UART_LSR_PE			BIT(2) /* parity error status */
+#define SUP_UART_LSR_RX			BIT(1) /* 1: receive fifo not empty */
+#define SUP_UART_LSR_TX			BIT(0) /* 1: transmit fifo is not full */
+#define SUP_UART_LSR_TX_NOT_FULL	1
+#define SUP_UART_LSR_BRK_ERROR_BITS	GENMASK(5, 2)
+
+/* Line Control Register bits */
+#define SUP_UART_LCR_SBC		BIT(5) /* select break condition */
+
+/* Modem Control Register bits */
+#define SUP_UART_MCR_RI			BIT(3) /* ring indicator */
+#define SUP_UART_MCR_DCD		BIT(2) /* data carrier detect */
+
+/* Interrupt Status/Control Register bits */
+#define SUP_UART_ISC_RXM		BIT(5) /* RX interrupt enable */
+#define SUP_UART_ISC_TXM		BIT(4) /* TX interrupt enable */
+#define SUP_UART_ISC_RX			BIT(1) /* RX interrupt status */
+#define SUP_UART_ISC_TX			BIT(0) /* TX interrupt status */
+
+#define SUP_DUMMY_READ			BIT(16) /* drop bytes received on a !CREAD port */
+#define SUP_UART_NR			5
+
+struct sunplus_uart_port {
+	struct uart_port port;
+	struct clk *clk;
+	struct reset_control *rstc;
+};
+
+static void sp_uart_put_char(struct uart_port *port, unsigned int ch)
+{
+	writel(ch, port->membase + SUP_UART_DATA);
+}
+
+static u32 sunplus_tx_buf_not_full(struct uart_port *port)
+{
+	unsigned int lsr = readl(port->membase + SUP_UART_LSR);
+
+	return (lsr & SUP_UART_LSR_TX) ? SUP_UART_LSR_TX_NOT_FULL : 0;
+}
+
+static unsigned int sunplus_tx_empty(struct uart_port *port)
+{
+	unsigned int lsr = readl(port->membase + SUP_UART_LSR);
+
+	return (lsr & UART_LSR_TEMT) ? TIOCSER_TEMT : 0;
+}
+
+static void sunplus_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	unsigned int mcr = readl(port->membase + SUP_UART_MCR);
+
+	if (mctrl & TIOCM_DTR)
+		mcr |= UART_MCR_DTR;
+	else
+		mcr &= ~UART_MCR_DTR;
+
+	if (mctrl & TIOCM_RTS)
+		mcr |= UART_MCR_RTS;
+	else
+		mcr &= ~UART_MCR_RTS;
+
+	if (mctrl & TIOCM_CAR)
+		mcr |= SUP_UART_MCR_DCD;
+	else
+		mcr &= ~SUP_UART_MCR_DCD;
+
+	if (mctrl & TIOCM_RI)
+		mcr |= SUP_UART_MCR_RI;
+	else
+		mcr &= ~SUP_UART_MCR_RI;
+
+	if (mctrl & TIOCM_LOOP)
+		mcr |= UART_MCR_LOOP;
+	else
+		mcr &= ~UART_MCR_LOOP;
+
+	writel(mcr, port->membase + SUP_UART_MCR);
+}
+
+static unsigned int sunplus_get_mctrl(struct uart_port *port)
+{
+	unsigned int mcr, ret = 0;
+
+	mcr = readl(port->membase + SUP_UART_MCR);
+
+	if (mcr & UART_MCR_DTR)
+		ret |= TIOCM_DTR;
+
+	if (mcr & UART_MCR_RTS)
+		ret |= TIOCM_RTS;
+
+	if (mcr & SUP_UART_MCR_DCD)
+		ret |= TIOCM_CAR;
+
+	if (mcr & SUP_UART_MCR_RI)
+		ret |= TIOCM_RI;
+
+	if (mcr & UART_MCR_LOOP)
+		ret |= TIOCM_LOOP;
+
+	return ret;
+}
+
+static void sunplus_stop_tx(struct uart_port *port)
+{
+	unsigned int isc;
+
+	isc = readl(port->membase + SUP_UART_ISC);
+	isc &= ~SUP_UART_ISC_TXM;
+	writel(isc, port->membase + SUP_UART_ISC);
+}
+
+static void sunplus_start_tx(struct uart_port *port)
+{
+	unsigned int isc;
+
+	isc = readl(port->membase + SUP_UART_ISC);
+	isc |= SUP_UART_ISC_TXM;
+	writel(isc, port->membase + SUP_UART_ISC);
+}
+
+static void sunplus_stop_rx(struct uart_port *port)
+{
+	unsigned int isc;
+
+	isc = readl(port->membase + SUP_UART_ISC);
+	isc &= ~SUP_UART_ISC_RXM;
+	writel(isc, port->membase + SUP_UART_ISC);
+}
+
+static void sunplus_break_ctl(struct uart_port *port, int ctl)
+{
+	unsigned long flags;
+	unsigned int lcr;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	lcr = readl(port->membase + SUP_UART_LCR);
+
+	if (ctl)
+		lcr |= SUP_UART_LCR_SBC; /* start break */
+	else
+		lcr &= ~SUP_UART_LCR_SBC; /* stop break */
+
+	writel(lcr, port->membase + SUP_UART_LCR);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void transmit_chars(struct uart_port *port)
+{
+	struct circ_buf *xmit = &port->state->xmit;
+
+	if (port->x_char) {
+		sp_uart_put_char(port, port->x_char);
+		port->icount.tx++;
+		port->x_char = 0;
+		return;
+	}
+
+	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
+		sunplus_stop_tx(port);
+		return;
+	}
+
+	do {
+		sp_uart_put_char(port, xmit->buf[xmit->tail]);
+		xmit->tail = (xmit->tail + 1) % UART_XMIT_SIZE;
+		port->icount.tx++;
+
+		if (uart_circ_empty(xmit))
+			break;
+	} while (sunplus_tx_buf_not_full(port));
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit))
+		sunplus_stop_tx(port);
+}
+
+static void receive_chars(struct uart_port *port)
+{
+	unsigned int lsr = readl(port->membase + SUP_UART_LSR);
+	unsigned int ch, flag;
+
+	do {
+		ch = readl(port->membase + SUP_UART_DATA);
+		flag = TTY_NORMAL;
+		port->icount.rx++;
+
+		if (unlikely(lsr & SUP_UART_LSR_BRK_ERROR_BITS)) {
+			if (lsr & SUP_UART_LSR_BC) {
+				lsr &= ~(SUP_UART_LSR_FE | SUP_UART_LSR_PE);
+				port->icount.brk++;
+				flag = TTY_BREAK;
+				if (uart_handle_break(port))
+					goto ignore_char;
+			} else if (lsr & SUP_UART_LSR_PE) {
+				port->icount.parity++;
+				flag = TTY_PARITY;
+			} else if (lsr & SUP_UART_LSR_FE) {
+				port->icount.frame++;
+				flag = TTY_FRAME;
+			}
+
+			if (lsr & SUP_UART_LSR_OE)
+				port->icount.overrun++;
+		}
+
+		if (port->ignore_status_mask & SUP_DUMMY_READ)
+			goto ignore_char;
+
+		if (uart_handle_sysrq_char(port, ch))
+			goto ignore_char;
+
+		uart_insert_char(port, lsr, SUP_UART_LSR_OE, ch, flag);
+
+ignore_char:
+		lsr = readl(port->membase + SUP_UART_LSR);
+	} while (lsr & SUP_UART_LSR_RX);
+
+	tty_flip_buffer_push(&port->state->port);
+}
+
+static irqreturn_t sunplus_uart_irq(int irq, void *args)
+{
+	struct uart_port *port = args;
+	unsigned int isc;
+
+	spin_lock(&port->lock);
+
+	isc = readl(port->membase + SUP_UART_ISC);
+
+	if (isc & SUP_UART_ISC_RX)
+		receive_chars(port);
+
+	if (isc & SUP_UART_ISC_TX)
+		transmit_chars(port);
+
+	spin_unlock(&port->lock);
+
+	return IRQ_HANDLED;
+}
+
+static int sunplus_startup(struct uart_port *port)
+{
+	unsigned long flags;
+	unsigned int isc = 0;
+	int ret;
+
+	ret = request_irq(port->irq, sunplus_uart_irq, 0, "sunplus_uart", port);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&port->lock, flags);
+	/* isc define Bit[7:4] int setting, Bit[3:0] int status
+	 * isc register will clean Bit[3:0] int status after read
+	 * only do a write to Bit[7:4] int setting
+	 */
+	isc |= SUP_UART_ISC_RXM;
+	writel(isc, port->membase + SUP_UART_ISC);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return 0;
+}
+
+static void sunplus_shutdown(struct uart_port *port)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+	/* isc define Bit[7:4] int setting, Bit[3:0] int status
+	 * isc register will clean Bit[3:0] int status after read
+	 * only do a write to Bit[7:4] int setting
+	 */
+	writel(0, port->membase + SUP_UART_ISC); /* disable all interrupt */
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	free_irq(port->irq, port);
+}
+
+static void sunplus_set_termios(struct uart_port *port,
+				struct ktermios *termios,
+				struct ktermios *oldtermios)
+{
+	u32 ext, div, div_l, div_h, baud, lcr;
+	u32 clk = port->uartclk;
+	unsigned long flags;
+
+	baud = uart_get_baud_rate(port, termios, oldtermios, 0, port->uartclk / 16);
+
+	/* baud rate = uartclk / ((16 * divisor + 1) + divisor_ext) */
+	clk += baud >> 1;
+	div = clk / baud;
+	ext = div & 0x0F;
+	div = (div >> 4) - 1;
+	div_l = (div & 0xFF) | (ext << 12);
+	div_h = div >> 8;
+
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		lcr = UART_LCR_WLEN5;
+		break;
+	case CS6:
+		lcr = UART_LCR_WLEN6;
+		break;
+	case CS7:
+		lcr = UART_LCR_WLEN7;
+		break;
+	default:
+		lcr = UART_LCR_WLEN8;
+		break;
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		lcr |= UART_LCR_STOP;
+
+	if (termios->c_cflag & PARENB) {
+		lcr |= UART_LCR_PARITY;
+
+		if (!(termios->c_cflag & PARODD))
+			lcr |= UART_LCR_EPAR;
+	}
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	port->read_status_mask = 0;
+	if (termios->c_iflag & INPCK)
+		port->read_status_mask |= SUP_UART_LSR_PE | SUP_UART_LSR_FE;
+
+	if (termios->c_iflag & (BRKINT | PARMRK))
+		port->read_status_mask |= SUP_UART_LSR_BC;
+
+	/* Characters to ignore */
+	port->ignore_status_mask = 0;
+	if (termios->c_iflag & IGNPAR)
+		port->ignore_status_mask |= SUP_UART_LSR_FE | SUP_UART_LSR_PE;
+
+	if (termios->c_iflag & IGNBRK) {
+		port->ignore_status_mask |= SUP_UART_LSR_BC;
+
+		if (termios->c_iflag & IGNPAR)
+			port->ignore_status_mask |= SUP_UART_LSR_OE;
+	}
+
+	/* Ignore all characters if CREAD is not set */
+	if ((termios->c_cflag & CREAD) == 0) {
+		port->ignore_status_mask |= SUP_DUMMY_READ;
+		/* flush rx data FIFO */
+		writel(0, port->membase + SUP_UART_RX_RESIDUE);
+	}
+
+	/* Settings for baud rate divisor and lcr */
+	writel(div_h, port->membase + SUP_UART_DIV_H);
+	writel(div_l, port->membase + SUP_UART_DIV_L);
+	writel(lcr, port->membase + SUP_UART_LCR);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void sunplus_set_ldisc(struct uart_port *port, struct ktermios *termios)
+{
+	int new = termios->c_line;
+
+	if (new == N_PPS)
+		port->flags |= UPF_HARDPPS_CD;
+	else
+		port->flags &= ~UPF_HARDPPS_CD;
+}
+
+static const char *sunplus_type(struct uart_port *port)
+{
+	return port->type == PORT_SUNPLUS ? "sunplus_uart" : NULL;
+}
+
+static void sunplus_config_port(struct uart_port *port, int type)
+{
+	if (type & UART_CONFIG_TYPE)
+		port->type = PORT_SUNPLUS;
+}
+
+static int sunplus_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_SUNPLUS)
+		return -EINVAL;
+
+	return 0;
+}
+
+#if defined(CONFIG_SERIAL_SUNPLUS_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
+static void wait_for_xmitr(struct uart_port *port)
+{
+	unsigned int val;
+	int ret;
+
+	/* Wait while FIFO is full or timeout */
+	ret = readl_poll_timeout_atomic(port->membase + SUP_UART_LSR, val,
+					(val & SUP_UART_LSR_TX), 1, 10000);
+
+	if (ret == -ETIMEDOUT) {
+		dev_err(port->dev, "Timeout waiting while UART TX FULL\n");
+		return;
+	}
+}
+#endif
+
+#ifdef CONFIG_CONSOLE_POLL
+static void sunplus_poll_put_char(struct uart_port *port, unsigned char data)
+{
+	wait_for_xmitr(port);
+	sp_uart_put_char(port, data);
+}
+
+static int sunplus_poll_get_char(struct uart_port *port)
+{
+	unsigned int lsr = readl(port->membase + SUP_UART_LSR);
+
+	if (!(lsr & SUP_UART_LSR_RX))
+		return NO_POLL_CHAR;
+
+	return readl(port->membase + SUP_UART_DATA);
+}
+#endif
+
+static const struct uart_ops sunplus_uart_ops = {
+	.tx_empty	= sunplus_tx_empty,
+	.set_mctrl	= sunplus_set_mctrl,
+	.get_mctrl	= sunplus_get_mctrl,
+	.stop_tx	= sunplus_stop_tx,
+	.start_tx	= sunplus_start_tx,
+	.stop_rx	= sunplus_stop_rx,
+	.break_ctl	= sunplus_break_ctl,
+	.startup	= sunplus_startup,
+	.shutdown	= sunplus_shutdown,
+	.set_termios	= sunplus_set_termios,
+	.set_ldisc	= sunplus_set_ldisc,
+	.type		= sunplus_type,
+	.config_port	= sunplus_config_port,
+	.verify_port	= sunplus_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_put_char	= sunplus_poll_put_char,
+	.poll_get_char	= sunplus_poll_get_char,
+#endif
+};
+
+#ifdef CONFIG_SERIAL_SUNPLUS_CONSOLE
+struct sunplus_uart_port *sunplus_console_ports[SUP_UART_NR];
+
+static void sunplus_uart_console_putchar(struct uart_port *port,
+					 unsigned char ch)
+{
+	wait_for_xmitr(port);
+	sp_uart_put_char(port, ch);
+}
+
+static void sunplus_console_write(struct console *co,
+				  const char *s,
+				  unsigned int count)
+{
+	unsigned long flags;
+	int locked = 1;
+
+	local_irq_save(flags);
+
+	if (sunplus_console_ports[co->index]->port.sysrq)
+		locked = 0;
+	else if (oops_in_progress)
+		locked = spin_trylock(&sunplus_console_ports[co->index]->port.lock);
+	else
+		spin_lock(&sunplus_console_ports[co->index]->port.lock);
+
+	uart_console_write(&sunplus_console_ports[co->index]->port, s, count,
+			   sunplus_uart_console_putchar);
+
+	if (locked)
+		spin_unlock(&sunplus_console_ports[co->index]->port.lock);
+
+	local_irq_restore(flags);
+}
+
+static int __init sunplus_console_setup(struct console *co, char *options)
+{
+	struct sunplus_uart_port *sup;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	if (co->index < 0 || co->index >= SUP_UART_NR)
+		return -EINVAL;
+
+	sup = sunplus_console_ports[co->index];
+	if (!sup)
+		return -ENODEV;
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(&sup->port, co, baud, parity, bits, flow);
+}
+
+static struct uart_driver sunplus_uart_driver;
+static struct console sunplus_uart_console = {
+	.name		= "ttySUP",
+	.write		= sunplus_console_write,
+	.device		= uart_console_device,
+	.setup		= sunplus_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data		= &sunplus_uart_driver
+};
+
+#define	SERIAL_SUNPLUS_CONSOLE	(&sunplus_uart_console)
+#else
+#define	SERIAL_SUNPLUS_CONSOLE	NULL
+#endif
+
+static struct uart_driver sunplus_uart_driver = {
+	.owner		= THIS_MODULE,
+	.driver_name	= "sunplus_uart",
+	.dev_name	= "ttySUP",
+	.major		= TTY_MAJOR,
+	.minor		= 64,
+	.nr		= SUP_UART_NR,
+	.cons		= SERIAL_SUNPLUS_CONSOLE,
+};
+
+static void sunplus_uart_disable_unprepare(void *data)
+{
+	clk_disable_unprepare(data);
+}
+
+static void sunplus_uart_reset_control_assert(void *data)
+{
+	reset_control_assert(data);
+}
+
+static int sunplus_uart_probe(struct platform_device *pdev)
+{
+	struct sunplus_uart_port *sup;
+	struct uart_port *port;
+	struct resource *res;
+	int ret, irq;
+
+	pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");
+
+	if (pdev->id < 0 || pdev->id >= SUP_UART_NR)
+		return -EINVAL;
+
+	sup = devm_kzalloc(&pdev->dev, sizeof(*sup), GFP_KERNEL);
+	if (!sup)
+		return -ENOMEM;
+
+	sup->clk = devm_clk_get_optional(&pdev->dev, NULL);
+	if (IS_ERR(sup->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(sup->clk), "clk not found\n");
+
+	ret = clk_prepare_enable(sup->clk);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(&pdev->dev, sunplus_uart_disable_unprepare, sup->clk);
+	if (ret)
+		return ret;
+
+	sup->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+	if (IS_ERR(sup->rstc))
+		return dev_err_probe(&pdev->dev, PTR_ERR(sup->rstc), "rstc not found\n");
+
+	port = &sup->port;
+
+	port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(port->membase))
+		return dev_err_probe(&pdev->dev, PTR_ERR(port->membase), "membase not found\n");
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	port->mapbase = res->start;
+	port->uartclk = clk_get_rate(sup->clk);
+	port->line = pdev->id;
+	port->irq = irq;
+	port->dev = &pdev->dev;
+	port->iotype = UPIO_MEM;
+	port->ops = &sunplus_uart_ops;
+	port->flags = UPF_BOOT_AUTOCONF;
+	port->fifosize = 128;
+
+	ret = reset_control_deassert(sup->rstc);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(&pdev->dev, sunplus_uart_reset_control_assert, sup->rstc);
+	if (ret)
+		return ret;
+
+#ifdef CONFIG_SERIAL_SUNPLUS_CONSOLE
+	sunplus_console_ports[sup->port.line] = sup;
+#endif
+
+	platform_set_drvdata(pdev, &sup->port);
+
+	ret = uart_add_one_port(&sunplus_uart_driver, &sup->port);
+#ifdef CONFIG_SERIAL_SUNPLUS_CONSOLE
+	if (ret)
+		sunplus_console_ports[sup->port.line] = NULL;
+#endif
+
+	return ret;
+}
+
+static int sunplus_uart_remove(struct platform_device *pdev)
+{
+	struct sunplus_uart_port *sup = platform_get_drvdata(pdev);
+
+	uart_remove_one_port(&sunplus_uart_driver, &sup->port);
+
+	return 0;
+}
+
+static int __maybe_unused sunplus_uart_suspend(struct device *dev)
+{
+	struct sunplus_uart_port *sup = dev_get_drvdata(dev);
+
+	if (!uart_console(&sup->port))
+		uart_suspend_port(&sunplus_uart_driver, &sup->port);
+
+	return 0;
+}
+
+static int __maybe_unused sunplus_uart_resume(struct device *dev)
+{
+	struct sunplus_uart_port *sup = dev_get_drvdata(dev);
+
+	if (!uart_console(&sup->port))
+		uart_resume_port(&sunplus_uart_driver, &sup->port);
+
+	return 0;
+}
+
+static const struct dev_pm_ops sunplus_uart_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sunplus_uart_suspend, sunplus_uart_resume)
+};
+
+static const struct of_device_id sp_uart_of_match[] = {
+	{ .compatible = "sunplus,sp7021-uart" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sp_uart_of_match);
+
+static struct platform_driver sunplus_uart_platform_driver = {
+	.probe		= sunplus_uart_probe,
+	.remove		= sunplus_uart_remove,
+	.driver = {
+		.name	= "sunplus_uart",
+		.of_match_table = sp_uart_of_match,
+		.pm     = &sunplus_uart_pm_ops,
+	}
+};
+
+static int __init sunplus_uart_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&sunplus_uart_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&sunplus_uart_platform_driver);
+	if (ret)
+		uart_unregister_driver(&sunplus_uart_driver);
+
+	return ret;
+}
+module_init(sunplus_uart_init);
+
+static void __exit sunplus_uart_exit(void)
+{
+	platform_driver_unregister(&sunplus_uart_platform_driver);
+	uart_unregister_driver(&sunplus_uart_driver);
+}
+module_exit(sunplus_uart_exit);
+
+#ifdef CONFIG_SERIAL_EARLYCON
+static void sunplus_uart_putc(struct uart_port *port, unsigned char c)
+{
+	unsigned int val;
+	int ret;
+
+	ret = readl_poll_timeout_atomic(port->membase + SUP_UART_LSR, val,
+					(val & UART_LSR_TEMT), 1, 10000);
+	if (ret)
+		return;
+
+	writel(c, port->membase + SUP_UART_DATA);
+}
+
+static void sunplus_uart_early_write(struct console *con, const char *s, unsigned int n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, sunplus_uart_putc);
+}
+
+static int __init
+sunplus_uart_early_setup(struct earlycon_device *dev, const char *opt)
+{
+	if (!(dev->port.membase || dev->port.iobase))
+		return -ENODEV;
+
+	dev->con->write = sunplus_uart_early_write;
+
+	return 0;
+}
+OF_EARLYCON_DECLARE(sunplus_uart, "sunplus,sp7021-uart", sunplus_uart_early_setup);
+#endif
+
+MODULE_DESCRIPTION("Sunplus UART driver");
+MODULE_AUTHOR("Hammer Hsieh <hammerh0314@gmail.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
index 92e572634009..6ea52293d9f3 100644
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -846,7 +846,7 @@ static struct uart_sunsab_port *sunsab_ports;
 
 #ifdef CONFIG_SERIAL_SUNSAB_CONSOLE
 
-static void sunsab_console_putchar(struct uart_port *port, int c)
+static void sunsab_console_putchar(struct uart_port *port, unsigned char c)
 {
 	struct uart_sunsab_port *up =
 		container_of(port, struct uart_sunsab_port, port);
diff --git a/drivers/tty/serial/sunsu.c b/drivers/tty/serial/sunsu.c
index 98b2f4fb9a99..c31389114b86 100644
--- a/drivers/tty/serial/sunsu.c
+++ b/drivers/tty/serial/sunsu.c
@@ -1281,7 +1281,7 @@ static void wait_for_xmitr(struct uart_sunsu_port *up)
 	}
 }
 
-static void sunsu_console_putchar(struct uart_port *port, int ch)
+static void sunsu_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct uart_sunsu_port *up =
 		container_of(port, struct uart_sunsu_port, port);
diff --git a/drivers/tty/serial/sunzilog.c b/drivers/tty/serial/sunzilog.c
index b714b00d2dad..c14275d83b0b 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -100,7 +100,7 @@ struct uart_sunzilog_port {
 #endif
 };
 
-static void sunzilog_putchar(struct uart_port *port, int ch);
+static void sunzilog_putchar(struct uart_port *port, unsigned char ch);
 
 #define ZILOG_CHANNEL_FROM_PORT(PORT)	((struct zilog_channel __iomem *)((PORT)->membase))
 #define UART_ZILOG(PORT)		((struct uart_sunzilog_port *)(PORT))
@@ -1125,7 +1125,7 @@ static void sunzilog_free_tables(void)
 
 #define ZS_PUT_CHAR_MAX_DELAY	2000	/* 10 ms */
 
-static void __maybe_unused sunzilog_putchar(struct uart_port *port, int ch)
+static void __maybe_unused sunzilog_putchar(struct uart_port *port, unsigned char ch)
 {
 	struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
 	int loops = ZS_PUT_CHAR_MAX_DELAY;
diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index e1fa52d31474..007db67292a2 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -482,7 +482,7 @@ static void ulite_console_wait_tx(struct uart_port *port)
 			 "timeout waiting for TX buffer empty\n");
 }
 
-static void ulite_console_putchar(struct uart_port *port, int ch)
+static void ulite_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	ulite_console_wait_tx(port);
 	uart_out32(ch, ULITE_TX, port);
@@ -558,7 +558,7 @@ static struct console ulite_console = {
 	.data	= &ulite_uart_driver,
 };
 
-static void early_uartlite_putc(struct uart_port *port, int c)
+static void early_uartlite_putc(struct uart_port *port, unsigned char c)
 {
 	/*
 	 * Limit how many times we'll spin waiting for TX FIFO status.
diff --git a/drivers/tty/serial/vr41xx_siu.c b/drivers/tty/serial/vr41xx_siu.c
index 647198b1e2b9..e0bf003ca3a1 100644
--- a/drivers/tty/serial/vr41xx_siu.c
+++ b/drivers/tty/serial/vr41xx_siu.c
@@ -504,20 +504,7 @@ static void siu_set_termios(struct uart_port *port, struct ktermios *new,
 	unsigned long flags;
 
 	c_cflag = new->c_cflag;
-	switch (c_cflag & CSIZE) {
-	case CS5:
-		lcr = UART_LCR_WLEN5;
-		break;
-	case CS6:
-		lcr = UART_LCR_WLEN6;
-		break;
-	case CS7:
-		lcr = UART_LCR_WLEN7;
-		break;
-	default:
-		lcr = UART_LCR_WLEN8;
-		break;
-	}
+	lcr = UART_LCR_WLEN(tty_get_char_size(c_cflag));
 
 	if (c_cflag & CSTOPB)
 		lcr |= UART_LCR_STOP;
@@ -743,7 +730,7 @@ static void wait_for_xmitr(struct uart_port *port)
 	}
 }
 
-static void siu_console_putchar(struct uart_port *port, int ch)
+static void siu_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	wait_for_xmitr(port);
 	siu_write(port, UART_TX, ch);
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 9adfe3dc970f..6f08136ce78a 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -484,7 +484,7 @@ static void wait_for_xmitr(struct uart_port *port)
 	} while (status & 0x10);
 }
 
-static void vt8500_console_putchar(struct uart_port *port, int c)
+static void vt8500_console_putchar(struct uart_port *port, unsigned char c)
 {
 	wait_for_xmitr(port);
 	writeb(c, port->membase + VT8500_TXFIFO);
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index d5e243908d9f..250a1d888eeb 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1142,7 +1142,7 @@ static struct uart_driver cdns_uart_uart_driver;
  * @port: Handle to the uart port structure
  * @ch: Character to be written
  */
-static void cdns_uart_console_putchar(struct uart_port *port, int ch)
+static void cdns_uart_console_putchar(struct uart_port *port, unsigned char ch)
 {
 	while (readl(port->membase + CDNS_UART_SR) & CDNS_UART_SR_TXFULL)
 		cpu_relax();
diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c
index 4b4f604646a7..70969bf9d82c 100644
--- a/drivers/tty/serial/zs.c
+++ b/drivers/tty/serial/zs.c
@@ -1124,7 +1124,7 @@ static int __init zs_probe_sccs(void)
 
 
 #ifdef CONFIG_SERIAL_ZS_CONSOLE
-static void zs_console_putchar(struct uart_port *uport, int ch)
+static void zs_console_putchar(struct uart_port *uport, unsigned char ch)
 {
 	struct zs_port *zport = to_zport(uport);
 	struct zs_scc *scc = zport->scc;
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 7709ce655f44..880608a65773 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -225,8 +225,11 @@ int tty_port_alloc_xmit_buf(struct tty_port *port)
 {
 	/* We may sleep in get_zeroed_page() */
 	mutex_lock(&port->buf_mutex);
-	if (port->xmit_buf == NULL)
+	if (port->xmit_buf == NULL) {
 		port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
+		if (port->xmit_buf)
+			kfifo_init(&port->xmit_fifo, port->xmit_buf, PAGE_SIZE);
+	}
 	mutex_unlock(&port->buf_mutex);
 	if (port->xmit_buf == NULL)
 		return -ENOMEM;
@@ -237,10 +240,9 @@ EXPORT_SYMBOL(tty_port_alloc_xmit_buf);
 void tty_port_free_xmit_buf(struct tty_port *port)
 {
 	mutex_lock(&port->buf_mutex);
-	if (port->xmit_buf != NULL) {
-		free_page((unsigned long)port->xmit_buf);
-		port->xmit_buf = NULL;
-	}
+	free_page((unsigned long)port->xmit_buf);
+	port->xmit_buf = NULL;
+	INIT_KFIFO(port->xmit_fifo);
 	mutex_unlock(&port->buf_mutex);
 }
 EXPORT_SYMBOL(tty_port_free_xmit_buf);
@@ -267,8 +269,7 @@ static void tty_port_destructor(struct kref *kref)
 	/* check if last port ref was dropped before tty release */
 	if (WARN_ON(port->itty))
 		return;
-	if (port->xmit_buf)
-		free_page((unsigned long)port->xmit_buf);
+	free_page((unsigned long)port->xmit_buf);
 	tty_port_destroy(port);
 	if (port->ops && port->ops->destruct)
 		port->ops->destruct(port);
@@ -732,6 +733,9 @@ EXPORT_SYMBOL_GPL(tty_port_install);
  * the device to be ready using tty_port_block_til_ready() (e.g.  raises
  * DTR/CTS and waits for carrier).
  *
+ * Note that @port->ops->shutdown is not called when @port->ops->activate
+ * returns an error (on the contrary, @tty->ops->close is).
+ *
  * Locking: Caller holds tty lock.
  *
  * Note: may drop and reacquire tty lock (in tty_port_block_til_ready()) so
diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index 58013698635f..8c685b501404 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -898,11 +898,13 @@ int vt_ioctl(struct tty_struct *tty,
 		if (arg > MAX_NR_CONSOLES)
 			return -ENXIO;
 
-		if (arg == 0)
+		if (arg == 0) {
 			vt_disallocate_all();
-		else
-			return vt_disallocate(--arg);
-		break;
+			break;
+		}
+
+		arg = array_index_nospec(arg - 1, MAX_NR_CONSOLES);
+		return vt_disallocate(arg);
 
 	case VT_RESIZE:
 	{