Merge tag 'tty-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial updates from Greg KH:
 "Here is the "big" TTY/Serial patch updates for 4.12-rc1

  Not a lot of new things here, the normal number of serial driver
  updates and additions, tiny bugs fixed, and some core files split up
  to make future changes a bit easier for Nicolas's "tiny-tty" work.

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

* tag 'tty-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (62 commits)
  serial: small Makefile reordering
  tty: split job control support into a file of its own
  tty: move baudrate handling code to a file of its own
  console: move console_init() out of tty_io.c
  serial: 8250_early: Add earlycon support for Palmchip UART
  tty: pl011: use "qdf2400_e44" as the earlycon name for QDF2400 E44
  vt: make mouse selection of non-ASCII consistent
  vt: set mouse selection word-chars to gpm's default
  imx-serial: Reduce RX DMA startup latency when opening for reading
  serial: omap: suspend device on probe errors
  serial: omap: fix runtime-pm handling on unbind
  tty: serial: omap: add UPF_BOOT_AUTOCONF flag for DT init
  serial: samsung: Remove useless spinlock
  serial: samsung: Add missing checks for dma_map_single failure
  serial: samsung: Use right device for DMA-mapping calls
  serial: imx: setup DCEDTE early and ensure DCD and RI irqs to be off
  tty: fix comment typo s/repsonsible/responsible/
  tty: amba-pl011: Fix spurious TX interrupts
  serial: xuartps: Enable clocks in the pm disable case also
  serial: core: Re-use struct uart_port {name} field
  ...

25 files changed, 585 insertions, 154 deletions

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 76e03a7de9cc..48a07e2f617f 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -218,7 +218,7 @@ static int serial_link_irq_chain(struct uart_8250_port *up)
 		spin_unlock_irq(&i->lock);
 		irq_flags |= up->port.irqflags;
 		ret = request_irq(up->port.irq, serial8250_interrupt,
-				  irq_flags, "serial", i);
+				  irq_flags, up->port.name, i);
 		if (ret < 0)
 			serial_do_unlink(i, up);
 	}
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index e65808c482f1..787b1160d3a5 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -530,12 +530,11 @@ static int dw8250_probe(struct platform_device *pdev)
 	}
 
 	data->rst = devm_reset_control_get_optional(dev, NULL);
-	if (IS_ERR(data->rst) && PTR_ERR(data->rst) == -EPROBE_DEFER) {
-		err = -EPROBE_DEFER;
+	if (IS_ERR(data->rst)) {
+		err = PTR_ERR(data->rst);
 		goto err_pclk;
 	}
-	if (!IS_ERR(data->rst))
-		reset_control_deassert(data->rst);
+	reset_control_deassert(data->rst);
 
 	dw8250_quirks(p, data);
 
@@ -567,8 +566,7 @@ static int dw8250_probe(struct platform_device *pdev)
 	return 0;
 
 err_reset:
-	if (!IS_ERR(data->rst))
-		reset_control_assert(data->rst);
+	reset_control_assert(data->rst);
 
 err_pclk:
 	if (!IS_ERR(data->pclk))
@@ -589,8 +587,7 @@ static int dw8250_remove(struct platform_device *pdev)
 
 	serial8250_unregister_port(data->line);
 
-	if (!IS_ERR(data->rst))
-		reset_control_assert(data->rst);
+	reset_control_assert(data->rst);
 
 	if (!IS_ERR(data->pclk))
 		clk_disable_unprepare(data->pclk);
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 85a12f032402..82fc48eca1df 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -39,6 +39,7 @@
 
 static unsigned int __init serial8250_early_in(struct uart_port *port, int offset)
 {
+	int reg_offset = offset;
 	offset <<= port->regshift;
 
 	switch (port->iotype) {
@@ -52,6 +53,8 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse
 		return ioread32be(port->membase + offset);
 	case UPIO_PORT:
 		return inb(port->iobase + offset);
+	case UPIO_AU:
+		return port->serial_in(port, reg_offset);
 	default:
 		return 0;
 	}
@@ -59,6 +62,7 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse
 
 static void __init serial8250_early_out(struct uart_port *port, int offset, int value)
 {
+	int reg_offset = offset;
 	offset <<= port->regshift;
 
 	switch (port->iotype) {
@@ -77,6 +81,9 @@ static void __init serial8250_early_out(struct uart_port *port, int offset, int
 	case UPIO_PORT:
 		outb(value, port->iobase + offset);
 		break;
+	case UPIO_AU:
+		port->serial_out(port, reg_offset, value);
+		break;
 	}
 }
 
@@ -172,3 +179,20 @@ OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup);
 OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup);
 
 #endif
+
+#ifdef CONFIG_SERIAL_8250_RT288X
+
+unsigned int au_serial_in(struct uart_port *p, int offset);
+void au_serial_out(struct uart_port *p, int offset, int value);
+
+static int __init early_au_setup(struct earlycon_device *dev, const char *opt)
+{
+	dev->port.serial_in = au_serial_in;
+	dev->port.serial_out = au_serial_out;
+	dev->port.iotype = UPIO_AU;
+	dev->con->write = early_serial8250_write;
+	return 0;
+}
+OF_EARLYCON_DECLARE(palmchip, "ralink,rt2880-uart", early_au_setup);
+
+#endif
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index b89c4ffc0486..1270ff163f63 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -483,5 +483,5 @@ static struct pci_driver exar_pci_driver = {
 module_pci_driver(exar_pci_driver);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Exar Serial Dricer");
+MODULE_DESCRIPTION("Exar Serial Driver");
 MODULE_AUTHOR("Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>");
diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
index b67e7a544935..e500f7dd2470 100644
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -61,6 +61,12 @@
  * The IRQ setting mode of F81866 is not the same with F81216 series.
  *	Level/Low: IRQ_MODE0:0, IRQ_MODE1:0
  *	Edge/High: IRQ_MODE0:1, IRQ_MODE1:0
+ *
+ * Clock speeds for UART (register F2h)
+ * 00: 1.8432MHz.
+ * 01: 18.432MHz.
+ * 10: 24MHz.
+ * 11: 14.769MHz.
  */
 #define F81866_IRQ_MODE		0xf0
 #define F81866_IRQ_SHARE	BIT(0)
@@ -72,6 +78,13 @@
 #define F81866_LDN_LOW		0x10
 #define F81866_LDN_HIGH		0x16
 
+#define F81866_UART_CLK 0xF2
+#define F81866_UART_CLK_MASK (BIT(1) | BIT(0))
+#define F81866_UART_CLK_1_8432MHZ 0
+#define F81866_UART_CLK_14_769MHZ (BIT(1) | BIT(0))
+#define F81866_UART_CLK_18_432MHZ BIT(0)
+#define F81866_UART_CLK_24MHZ BIT(1)
+
 struct fintek_8250 {
 	u16 pid;
 	u16 base_port;
@@ -256,8 +269,26 @@ static void fintek_8250_set_max_fifo(struct fintek_8250 *pdata)
 	}
 }
 
-static int probe_setup_port(struct fintek_8250 *pdata, u16 io_address,
-			  unsigned int irq)
+static void fintek_8250_goto_highspeed(struct uart_8250_port *uart,
+			      struct fintek_8250 *pdata)
+{
+	sio_write_reg(pdata, LDN, pdata->index);
+
+	switch (pdata->pid) {
+	case CHIP_ID_F81866: /* set uart clock for high speed serial mode */
+		sio_write_mask_reg(pdata, F81866_UART_CLK,
+			F81866_UART_CLK_MASK,
+			F81866_UART_CLK_14_769MHZ);
+
+			uart->port.uartclk = 921600 * 16;
+		break;
+	default: /* leave clock speed untouched */
+		break;
+	}
+}
+
+static int probe_setup_port(struct fintek_8250 *pdata,
+					struct uart_8250_port *uart)
 {
 	static const u16 addr[] = {0x4e, 0x2e};
 	static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67};
@@ -284,18 +315,20 @@ static int probe_setup_port(struct fintek_8250 *pdata, u16 io_address,
 				sio_write_reg(pdata, LDN, k);
 				aux = sio_read_reg(pdata, IO_ADDR1);
 				aux |= sio_read_reg(pdata, IO_ADDR2) << 8;
-				if (aux != io_address)
+				if (aux != uart->port.iobase)
 					continue;
 
 				pdata->index = k;
 
-				irq_data = irq_get_irq_data(irq);
+				irq_data = irq_get_irq_data(uart->port.irq);
 				if (irq_data)
 					level_mode =
 						irqd_is_level_type(irq_data);
 
 				fintek_8250_set_irq_mode(pdata, level_mode);
 				fintek_8250_set_max_fifo(pdata);
+				fintek_8250_goto_highspeed(uart, pdata);
+
 				fintek_8250_exit_key(addr[i]);
 
 				return 0;
@@ -330,7 +363,7 @@ int fintek_8250_probe(struct uart_8250_port *uart)
 	struct fintek_8250 *pdata;
 	struct fintek_8250 probe_data;
 
-	if (probe_setup_port(&probe_data, uart->port.iobase, uart->port.irq))
+	if (probe_setup_port(&probe_data, uart))
 		return -ENODEV;
 
 	pdata = devm_kzalloc(uart->port.dev, sizeof(*pdata), GFP_KERNEL);
diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
index f3ea90f0e411..7dddd7e6a01c 100644
--- a/drivers/tty/serial/8250/8250_lpss.c
+++ b/drivers/tty/serial/8250/8250_lpss.c
@@ -183,7 +183,6 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
 	if (ret)
 		return;
 
-	pci_set_master(pdev);
 	pci_try_set_mwi(pdev);
 
 	/* Special DMA address for UART */
@@ -216,6 +215,8 @@ static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 	struct pci_dev *pdev = to_pci_dev(port->dev);
 	int ret;
 
+	pci_set_master(pdev);
+
 	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
 	if (ret < 0)
 		return ret;
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 6119516ef5fc..09a65a3ec7f7 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -328,7 +328,7 @@ static const s8 au_io_out_map[8] = {
 	-1,	/* UART_SCR (unmapped) */
 };
 
-static unsigned int au_serial_in(struct uart_port *p, int offset)
+unsigned int au_serial_in(struct uart_port *p, int offset)
 {
 	if (offset >= ARRAY_SIZE(au_io_in_map))
 		return UINT_MAX;
@@ -338,7 +338,7 @@ static unsigned int au_serial_in(struct uart_port *p, int offset)
 	return __raw_readl(p->membase + (offset << p->regshift));
 }
 
-static void au_serial_out(struct uart_port *p, int offset, int value)
+void au_serial_out(struct uart_port *p, int offset, int value)
 {
 	if (offset >= ARRAY_SIZE(au_io_out_map))
 		return;
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 6117ac8da48f..5c8850f7a2a0 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -630,6 +630,15 @@ config SERIAL_UARTLITE_CONSOLE
 	  console (the system console is the device which receives all kernel
 	  messages and warnings and which allows logins in single user mode).
 
+config SERIAL_UARTLITE_NR_UARTS
+	int "Maximum number of uartlite serial ports"
+	depends on SERIAL_UARTLITE
+	range 1 256
+	default 1
+	help
+	  Set this to the number of uartlites in your system, or the number
+	  you think you might implement.
+
 config SERIAL_SUNCORE
 	bool
 	depends on SPARC
@@ -1343,6 +1352,7 @@ config SERIAL_ALTERA_JTAGUART_CONSOLE
 	bool "Altera JTAG UART console support"
 	depends on SERIAL_ALTERA_JTAGUART=y
 	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 	help
 	  Enable a Altera JTAG UART port to be the system console.
 
@@ -1382,6 +1392,7 @@ config SERIAL_ALTERA_UART_CONSOLE
 	bool "Altera UART console support"
 	depends on SERIAL_ALTERA_UART=y
 	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 	help
 	  Enable a Altera UART port to be the system console.
 
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 2d6288bc4554..53c03e005132 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -3,7 +3,6 @@
 #
 
 obj-$(CONFIG_SERIAL_CORE) += serial_core.o
-obj-$(CONFIG_SERIAL_21285) += 21285.o
 
 obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o
 obj-$(CONFIG_SERIAL_EARLYCON_ARM_SEMIHOST) += earlycon-arm-semihost.o
@@ -17,6 +16,8 @@ obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
 obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
 obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
 
+obj-$(CONFIG_SERIAL_21285) += 21285.o
+
 # Now bring in any enabled 8250/16450/16550 type drivers.
 obj-$(CONFIG_SERIAL_8250) += 8250/
 
diff --git a/drivers/tty/serial/altera_jtaguart.c b/drivers/tty/serial/altera_jtaguart.c
index e409d7dac7ab..18e3f8342b85 100644
--- a/drivers/tty/serial/altera_jtaguart.c
+++ b/drivers/tty/serial/altera_jtaguart.c
@@ -383,6 +383,26 @@ console_initcall(altera_jtaguart_console_init);
 
 #define	ALTERA_JTAGUART_CONSOLE	(&altera_jtaguart_console)
 
+static void altera_jtaguart_earlycon_write(struct console *co, const char *s,
+					   unsigned int count)
+{
+	struct earlycon_device *dev = co->data;
+
+	uart_console_write(&dev->port, s, count, altera_jtaguart_console_putc);
+}
+
+static int __init altera_jtaguart_earlycon_setup(struct earlycon_device *dev,
+						 const char *options)
+{
+	if (!dev->port.membase)
+		return -ENODEV;
+
+	dev->con->write = altera_jtaguart_earlycon_write;
+	return 0;
+}
+
+OF_EARLYCON_DECLARE(juart, "altr,juart-1.0", altera_jtaguart_earlycon_setup);
+
 #else
 
 #define	ALTERA_JTAGUART_CONSOLE	NULL
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 820a74208696..46d3438a0d27 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -489,6 +489,38 @@ console_initcall(altera_uart_console_init);
 
 #define	ALTERA_UART_CONSOLE	(&altera_uart_console)
 
+static void altera_uart_earlycon_write(struct console *co, const char *s,
+				       unsigned int count)
+{
+	struct earlycon_device *dev = co->data;
+
+	uart_console_write(&dev->port, s, count, altera_uart_console_putc);
+}
+
+static int __init altera_uart_earlycon_setup(struct earlycon_device *dev,
+					     const char *options)
+{
+	struct uart_port *port = &dev->port;
+
+	if (!port->membase)
+		return -ENODEV;
+
+	/* Enable RX interrupts now */
+	writel(ALTERA_UART_CONTROL_RRDY_MSK,
+	       port->membase + ALTERA_UART_CONTROL_REG);
+
+	if (dev->baud) {
+		unsigned int baudclk = port->uartclk / dev->baud;
+
+		writel(baudclk, port->membase + ALTERA_UART_DIVISOR_REG);
+	}
+
+	dev->con->write = altera_uart_earlycon_write;
+	return 0;
+}
+
+OF_EARLYCON_DECLARE(uart, "altr,uart-1.0", altera_uart_earlycon_setup);
+
 #else
 
 #define	ALTERA_UART_CONSOLE	NULL
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index b0a377725d63..8a857bb34fbb 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1327,14 +1327,15 @@ static void pl011_stop_tx(struct uart_port *port)
 	pl011_dma_tx_stop(uap);
 }
 
-static void pl011_tx_chars(struct uart_amba_port *uap, bool from_irq);
+static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq);
 
 /* Start TX with programmed I/O only (no DMA) */
 static void pl011_start_tx_pio(struct uart_amba_port *uap)
 {
-	uap->im |= UART011_TXIM;
-	pl011_write(uap->im, uap, REG_IMSC);
-	pl011_tx_chars(uap, false);
+	if (pl011_tx_chars(uap, false)) {
+		uap->im |= UART011_TXIM;
+		pl011_write(uap->im, uap, REG_IMSC);
+	}
 }
 
 static void pl011_start_tx(struct uart_port *port)
@@ -1414,25 +1415,26 @@ static bool pl011_tx_char(struct uart_amba_port *uap, unsigned char c,
 	return true;
 }
 
-static void pl011_tx_chars(struct uart_amba_port *uap, bool from_irq)
+/* Returns true if tx interrupts have to be (kept) enabled  */
+static bool pl011_tx_chars(struct uart_amba_port *uap, bool from_irq)
 {
 	struct circ_buf *xmit = &uap->port.state->xmit;
 	int count = uap->fifosize >> 1;
 
 	if (uap->port.x_char) {
 		if (!pl011_tx_char(uap, uap->port.x_char, from_irq))
-			return;
+			return true;
 		uap->port.x_char = 0;
 		--count;
 	}
 	if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
 		pl011_stop_tx(&uap->port);
-		return;
+		return false;
 	}
 
 	/* If we are using DMA mode, try to send some characters. */
 	if (pl011_dma_tx_irq(uap))
-		return;
+		return true;
 
 	do {
 		if (likely(from_irq) && count-- == 0)
@@ -1447,8 +1449,11 @@ static void pl011_tx_chars(struct uart_amba_port *uap, bool from_irq)
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(&uap->port);
 
-	if (uart_circ_empty(xmit))
+	if (uart_circ_empty(xmit)) {
 		pl011_stop_tx(&uap->port);
+		return false;
+	}
+	return true;
 }
 
 static void pl011_modem_status(struct uart_amba_port *uap)
@@ -2470,19 +2475,34 @@ static int __init pl011_early_console_setup(struct earlycon_device *device,
 	if (!device->port.membase)
 		return -ENODEV;
 
-	/* On QDF2400 SOCs affected by Erratum 44, the "qdf2400_e44" must
-	 * also be specified, e.g. "earlycon=pl011,<address>,qdf2400_e44".
-	 */
-	if (!strcmp(device->options, "qdf2400_e44"))
-		device->con->write = qdf2400_e44_early_write;
-	else
-		device->con->write = pl011_early_write;
+	device->con->write = pl011_early_write;
 
 	return 0;
 }
 OF_EARLYCON_DECLARE(pl011, "arm,pl011", pl011_early_console_setup);
 OF_EARLYCON_DECLARE(pl011, "arm,sbsa-uart", pl011_early_console_setup);
-EARLYCON_DECLARE(qdf2400_e44, pl011_early_console_setup);
+
+/*
+ * On Qualcomm Datacenter Technologies QDF2400 SOCs affected by
+ * Erratum 44, traditional earlycon can be enabled by specifying
+ * "earlycon=qdf2400_e44,<address>".  Any options are ignored.
+ *
+ * Alternatively, you can just specify "earlycon", and the early console
+ * will be enabled with the information from the SPCR table.  In this
+ * case, the SPCR code will detect the need for the E44 work-around,
+ * and set the console name to "qdf2400_e44".
+ */
+static int __init
+qdf2400_e44_early_console_setup(struct earlycon_device *device,
+				const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = qdf2400_e44_early_write;
+	return 0;
+}
+EARLYCON_DECLARE(qdf2400_e44, qdf2400_e44_early_console_setup);
 
 #else
 #define AMBA_CONSOLE	NULL
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 1f50a83ef958..c355ac9abafc 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -38,7 +38,6 @@
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
 #include <linux/atmel_pdc.h>
-#include <linux/atmel_serial.h>
 #include <linux/uaccess.h>
 #include <linux/platform_data/atmel.h>
 #include <linux/timer.h>
@@ -71,6 +70,7 @@
 #include <linux/serial_core.h>
 
 #include "serial_mctrl_gpio.h"
+#include "atmel_serial.h"
 
 static void atmel_start_rx(struct uart_port *port);
 static void atmel_stop_rx(struct uart_port *port);
@@ -119,8 +119,9 @@ struct atmel_uart_char {
 /*
  * at91: 6 USARTs and one DBGU port (SAM9260)
  * avr32: 4
+ * samx7: 3 USARTs and 5 UARTs
  */
-#define ATMEL_MAX_UART		7
+#define ATMEL_MAX_UART		8
 
 /*
  * We wrap our port structure around the generic uart_port.
@@ -175,6 +176,7 @@ struct atmel_uart_port {
 	unsigned int		pending_status;
 	spinlock_t		lock_suspended;
 
+#ifdef CONFIG_PM
 	struct {
 		u32		cr;
 		u32		mr;
@@ -185,6 +187,7 @@ struct atmel_uart_port {
 		u32		fmr;
 		u32		fimr;
 	} cache;
+#endif
 
 	int (*prepare_rx)(struct uart_port *port);
 	int (*prepare_tx)(struct uart_port *port);
diff --git a/drivers/tty/serial/atmel_serial.h b/drivers/tty/serial/atmel_serial.h
new file mode 100644
index 000000000000..bd2560502f3c
--- /dev/null
+++ b/drivers/tty/serial/atmel_serial.h
@@ -0,0 +1,169 @@
+/*
+ * include/linux/atmel_serial.h
+ *
+ * Copyright (C) 2005 Ivan Kokshaysky
+ * Copyright (C) SAN People
+ *
+ * USART registers.
+ * Based on AT91RM9200 datasheet revision E.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef ATMEL_SERIAL_H
+#define ATMEL_SERIAL_H
+
+#define ATMEL_US_CR		0x00	/* Control Register */
+#define	ATMEL_US_RSTRX		BIT(2)	/* Reset Receiver */
+#define	ATMEL_US_RSTTX		BIT(3)	/* Reset Transmitter */
+#define	ATMEL_US_RXEN		BIT(4)	/* Receiver Enable */
+#define	ATMEL_US_RXDIS		BIT(5)	/* Receiver Disable */
+#define	ATMEL_US_TXEN		BIT(6)	/* Transmitter Enable */
+#define	ATMEL_US_TXDIS		BIT(7)	/* Transmitter Disable */
+#define	ATMEL_US_RSTSTA		BIT(8)	/* Reset Status Bits */
+#define	ATMEL_US_STTBRK		BIT(9)	/* Start Break */
+#define	ATMEL_US_STPBRK		BIT(10)	/* Stop Break */
+#define	ATMEL_US_STTTO		BIT(11)	/* Start Time-out */
+#define	ATMEL_US_SENDA		BIT(12)	/* Send Address */
+#define	ATMEL_US_RSTIT		BIT(13)	/* Reset Iterations */
+#define	ATMEL_US_RSTNACK	BIT(14)	/* Reset Non Acknowledge */
+#define	ATMEL_US_RETTO		BIT(15)	/* Rearm Time-out */
+#define	ATMEL_US_DTREN		BIT(16)	/* Data Terminal Ready Enable */
+#define	ATMEL_US_DTRDIS		BIT(17)	/* Data Terminal Ready Disable */
+#define	ATMEL_US_RTSEN		BIT(18)	/* Request To Send Enable */
+#define	ATMEL_US_RTSDIS		BIT(19)	/* Request To Send Disable */
+#define	ATMEL_US_TXFCLR		BIT(24)	/* Transmit FIFO Clear */
+#define	ATMEL_US_RXFCLR		BIT(25)	/* Receive FIFO Clear */
+#define	ATMEL_US_TXFLCLR	BIT(26)	/* Transmit FIFO Lock Clear */
+#define	ATMEL_US_FIFOEN		BIT(30)	/* FIFO enable */
+#define	ATMEL_US_FIFODIS	BIT(31)	/* FIFO disable */
+
+#define ATMEL_US_MR		0x04	/* Mode Register */
+#define	ATMEL_US_USMODE		GENMASK(3, 0)	/* Mode of the USART */
+#define		ATMEL_US_USMODE_NORMAL		0
+#define		ATMEL_US_USMODE_RS485		1
+#define		ATMEL_US_USMODE_HWHS		2
+#define		ATMEL_US_USMODE_MODEM		3
+#define		ATMEL_US_USMODE_ISO7816_T0	4
+#define		ATMEL_US_USMODE_ISO7816_T1	6
+#define		ATMEL_US_USMODE_IRDA		8
+#define	ATMEL_US_USCLKS		GENMASK(5, 4)	/* Clock Selection */
+#define		ATMEL_US_USCLKS_MCK		(0 <<  4)
+#define		ATMEL_US_USCLKS_MCK_DIV8	(1 <<  4)
+#define		ATMEL_US_USCLKS_SCK		(3 <<  4)
+#define	ATMEL_US_CHRL		GENMASK(7, 6)	/* Character Length */
+#define		ATMEL_US_CHRL_5			(0 <<  6)
+#define		ATMEL_US_CHRL_6			(1 <<  6)
+#define		ATMEL_US_CHRL_7			(2 <<  6)
+#define		ATMEL_US_CHRL_8			(3 <<  6)
+#define	ATMEL_US_SYNC		BIT(8)		/* Synchronous Mode Select */
+#define	ATMEL_US_PAR		GENMASK(11, 9)	/* Parity Type */
+#define		ATMEL_US_PAR_EVEN		(0 <<  9)
+#define		ATMEL_US_PAR_ODD		(1 <<  9)
+#define		ATMEL_US_PAR_SPACE		(2 <<  9)
+#define		ATMEL_US_PAR_MARK		(3 <<  9)
+#define		ATMEL_US_PAR_NONE		(4 <<  9)
+#define		ATMEL_US_PAR_MULTI_DROP		(6 <<  9)
+#define	ATMEL_US_NBSTOP		GENMASK(13, 12)	/* Number of Stop Bits */
+#define		ATMEL_US_NBSTOP_1		(0 << 12)
+#define		ATMEL_US_NBSTOP_1_5		(1 << 12)
+#define		ATMEL_US_NBSTOP_2		(2 << 12)
+#define	ATMEL_US_CHMODE		GENMASK(15, 14)	/* Channel Mode */
+#define		ATMEL_US_CHMODE_NORMAL		(0 << 14)
+#define		ATMEL_US_CHMODE_ECHO		(1 << 14)
+#define		ATMEL_US_CHMODE_LOC_LOOP	(2 << 14)
+#define		ATMEL_US_CHMODE_REM_LOOP	(3 << 14)
+#define	ATMEL_US_MSBF		BIT(16)	/* Bit Order */
+#define	ATMEL_US_MODE9		BIT(17)	/* 9-bit Character Length */
+#define	ATMEL_US_CLKO		BIT(18)	/* Clock Output Select */
+#define	ATMEL_US_OVER		BIT(19)	/* Oversampling Mode */
+#define	ATMEL_US_INACK		BIT(20)	/* Inhibit Non Acknowledge */
+#define	ATMEL_US_DSNACK		BIT(21)	/* Disable Successive NACK */
+#define	ATMEL_US_MAX_ITER	GENMASK(26, 24)	/* Max Iterations */
+#define	ATMEL_US_FILTER		BIT(28)	/* Infrared Receive Line Filter */
+
+#define ATMEL_US_IER		0x08	/* Interrupt Enable Register */
+#define	ATMEL_US_RXRDY		BIT(0)	/* Receiver Ready */
+#define	ATMEL_US_TXRDY		BIT(1)	/* Transmitter Ready */
+#define	ATMEL_US_RXBRK		BIT(2)	/* Break Received / End of Break */
+#define	ATMEL_US_ENDRX		BIT(3)	/* End of Receiver Transfer */
+#define	ATMEL_US_ENDTX		BIT(4)	/* End of Transmitter Transfer */
+#define	ATMEL_US_OVRE		BIT(5)	/* Overrun Error */
+#define	ATMEL_US_FRAME		BIT(6)	/* Framing Error */
+#define	ATMEL_US_PARE		BIT(7)	/* Parity Error */
+#define	ATMEL_US_TIMEOUT	BIT(8)	/* Receiver Time-out */
+#define	ATMEL_US_TXEMPTY	BIT(9)	/* Transmitter Empty */
+#define	ATMEL_US_ITERATION	BIT(10)	/* Max number of Repetitions Reached */
+#define	ATMEL_US_TXBUFE		BIT(11)	/* Transmission Buffer Empty */
+#define	ATMEL_US_RXBUFF		BIT(12)	/* Reception Buffer Full */
+#define	ATMEL_US_NACK		BIT(13)	/* Non Acknowledge */
+#define	ATMEL_US_RIIC		BIT(16)	/* Ring Indicator Input Change */
+#define	ATMEL_US_DSRIC		BIT(17)	/* Data Set Ready Input Change */
+#define	ATMEL_US_DCDIC		BIT(18)	/* Data Carrier Detect Input Change */
+#define	ATMEL_US_CTSIC		BIT(19)	/* Clear to Send Input Change */
+#define	ATMEL_US_RI		BIT(20)	/* RI */
+#define	ATMEL_US_DSR		BIT(21)	/* DSR */
+#define	ATMEL_US_DCD		BIT(22)	/* DCD */
+#define	ATMEL_US_CTS		BIT(23)	/* CTS */
+
+#define ATMEL_US_IDR		0x0c	/* Interrupt Disable Register */
+#define ATMEL_US_IMR		0x10	/* Interrupt Mask Register */
+#define ATMEL_US_CSR		0x14	/* Channel Status Register */
+#define ATMEL_US_RHR		0x18	/* Receiver Holding Register */
+#define ATMEL_US_THR		0x1c	/* Transmitter Holding Register */
+#define	ATMEL_US_SYNH		BIT(15)	/* Transmit/Receive Sync */
+
+#define ATMEL_US_BRGR		0x20	/* Baud Rate Generator Register */
+#define	ATMEL_US_CD		GENMASK(15, 0)	/* Clock Divider */
+#define ATMEL_US_FP_OFFSET	16	/* Fractional Part */
+#define ATMEL_US_FP_MASK	0x7
+
+#define ATMEL_US_RTOR		0x24	/* Receiver Time-out Register for USART */
+#define ATMEL_UA_RTOR		0x28	/* Receiver Time-out Register for UART */
+#define	ATMEL_US_TO		GENMASK(15, 0)	/* Time-out Value */
+
+#define ATMEL_US_TTGR		0x28	/* Transmitter Timeguard Register */
+#define	ATMEL_US_TG		GENMASK(7, 0)	/* Timeguard Value */
+
+#define ATMEL_US_FIDI		0x40	/* FI DI Ratio Register */
+#define ATMEL_US_NER		0x44	/* Number of Errors Register */
+#define ATMEL_US_IF		0x4c	/* IrDA Filter Register */
+
+#define ATMEL_US_CMPR		0x90	/* Comparaison Register */
+#define ATMEL_US_FMR		0xa0	/* FIFO Mode Register */
+#define	ATMEL_US_TXRDYM(data)	(((data) & 0x3) << 0)	/* TX Ready Mode */
+#define	ATMEL_US_RXRDYM(data)	(((data) & 0x3) << 4)	/* RX Ready Mode */
+#define		ATMEL_US_ONE_DATA	0x0
+#define		ATMEL_US_TWO_DATA	0x1
+#define		ATMEL_US_FOUR_DATA	0x2
+#define	ATMEL_US_FRTSC		BIT(7)	/* FIFO RTS pin Control */
+#define	ATMEL_US_TXFTHRES(thr)	(((thr) & 0x3f) << 8)	/* TX FIFO Threshold */
+#define	ATMEL_US_RXFTHRES(thr)	(((thr) & 0x3f) << 16)	/* RX FIFO Threshold */
+#define	ATMEL_US_RXFTHRES2(thr)	(((thr) & 0x3f) << 24)	/* RX FIFO Threshold2 */
+
+#define ATMEL_US_FLR		0xa4	/* FIFO Level Register */
+#define	ATMEL_US_TXFL(reg)	(((reg) >> 0) & 0x3f)	/* TX FIFO Level */
+#define	ATMEL_US_RXFL(reg)	(((reg) >> 16) & 0x3f)	/* RX FIFO Level */
+
+#define ATMEL_US_FIER		0xa8	/* FIFO Interrupt Enable Register */
+#define ATMEL_US_FIDR		0xac	/* FIFO Interrupt Disable Register */
+#define ATMEL_US_FIMR		0xb0	/* FIFO Interrupt Mask Register */
+#define ATMEL_US_FESR		0xb4	/* FIFO Event Status Register */
+#define	ATMEL_US_TXFEF		BIT(0)	/* Transmit FIFO Empty Flag */
+#define	ATMEL_US_TXFFF		BIT(1)	/* Transmit FIFO Full Flag */
+#define	ATMEL_US_TXFTHF		BIT(2)	/* Transmit FIFO Threshold Flag */
+#define	ATMEL_US_RXFEF		BIT(3)	/* Receive FIFO Empty Flag */
+#define	ATMEL_US_RXFFF		BIT(4)	/* Receive FIFO Full Flag */
+#define	ATMEL_US_RXFTHF		BIT(5)	/* Receive FIFO Threshold Flag */
+#define	ATMEL_US_TXFPTEF	BIT(6)	/* Transmit FIFO Pointer Error Flag */
+#define	ATMEL_US_RXFPTEF	BIT(7)	/* Receive FIFO Pointer Error Flag */
+#define	ATMEL_US_TXFLOCK	BIT(8)	/* Transmit FIFO Lock (FESR only) */
+#define	ATMEL_US_RXFTHF2	BIT(9)	/* Receive FIFO Threshold Flag 2 */
+
+#define ATMEL_US_NAME		0xf0	/* Ip Name */
+#define ATMEL_US_VERSION	0xfc	/* Ip Version */
+
+#endif
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index f02934ffb329..15df1ba78095 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1705,6 +1705,13 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count)
 {
 	struct lpuart_port *sport = lpuart_ports[co->index];
 	unsigned char  old_cr2, cr2;
+	unsigned long flags;
+	int locked = 1;
+
+	if (sport->port.sysrq || oops_in_progress)
+		locked = spin_trylock_irqsave(&sport->port.lock, flags);
+	else
+		spin_lock_irqsave(&sport->port.lock, flags);
 
 	/* first save CR2 and then disable interrupts */
 	cr2 = old_cr2 = readb(sport->port.membase + UARTCR2);
@@ -1719,6 +1726,9 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count)
 		barrier();
 
 	writeb(old_cr2, sport->port.membase + UARTCR2);
+
+	if (locked)
+		spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
 static void
@@ -1726,6 +1736,13 @@ lpuart32_console_write(struct console *co, const char *s, unsigned int count)
 {
 	struct lpuart_port *sport = lpuart_ports[co->index];
 	unsigned long  old_cr, cr;
+	unsigned long flags;
+	int locked = 1;
+
+	if (sport->port.sysrq || oops_in_progress)
+		locked = spin_trylock_irqsave(&sport->port.lock, flags);
+	else
+		spin_lock_irqsave(&sport->port.lock, flags);
 
 	/* first save CR2 and then disable interrupts */
 	cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL);
@@ -1740,6 +1757,9 @@ lpuart32_console_write(struct console *co, const char *s, unsi