TTY/Serial updates for 4.14-rc1

Here is the big tty/serial driver update for 4.14-rc1.
 
 Well, not all that big, just a number of small serial driver fixes, and
 a new serial driver.  Also in here are some much needed goldfish tty
 driver (emulator) fixes to try to get that codebase under control.
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 -----BEGIN PGP SIGNATURE-----
 
 iG0EABECAC0WIQT0tgzFv3jCIUoxPcsxR9QN2y37KQUCWa2A+A8cZ3JlZ0Brcm9h
 aC5jb20ACgkQMUfUDdst+ylNKACfWOuWb4PEGzPg2hF57V1g0cq8VXEAn0BtZT+n
 uuCBV53ylesoHhEhKf/D
 =g+za
 -----END PGP SIGNATURE-----

Merge tag 'tty-4.14-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 driver update for 4.14-rc1.

  Well, not all that big, just a number of small serial driver fixes,
  and a new serial driver. Also in here are some much needed goldfish
  tty driver (emulator) fixes to try to get that codebase under control.

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

* tag 'tty-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (94 commits)
  tty: goldfish: Implement support for kernel 'earlycon' parameter
  tty: goldfish: Use streaming DMA for r/w operations on Ranchu platforms
  tty: goldfish: Refactor constants to better reflect their nature
  serial: 8250_port: Remove useless NULL checks
  earlycon: initialise baud field of earlycon device structure
  tty: hvcs: make ktermios const
  pty: show associative slave of ptmx in fdinfo
  tty: n_gsm: Add compat_ioctl
  tty: hvcs: constify vio_device_id
  tty: hvc_vio: constify vio_device_id
  tty: mips_ejtag_fdc: constify mips_cdmm_device_id
  Introduce 8250_men_mcb
  mcb: introduce mcb_get_resource()
  serial: imx: Avoid post-PIO cleanup if TX DMA is started
  tty: serial: imx: disable irq after suspend
  serial: 8250_uniphier: add suspend/resume support
  serial: 8250_uniphier: use CHAR register for canary to detect power-off
  serial: 8250_uniphier: fix serial port index in private data
  serial: 8250: of: Add new port type for MediaTek BTIF controller on MT7622/23 SoC
  dt-bindings: serial: 8250: Add MediaTek BTIF controller bindings
  ...

Documentation/devicetree/bindings/serial/8250.txt

@@ -14,6 +14,8 @@ Required properties:
 	  tegra132, or tegra210.
 	- "nxp,lpc3220-uart"
 	- "ralink,rt2880-uart"
+	- For MediaTek BTIF, must contain '"mediatek,<chip>-btif",
+	  "mediatek,mtk-btif"' where <chip> is mt7622, mt7623.
 	- "altr,16550-FIFO32"
 	- "altr,16550-FIFO64"
 	- "altr,16550-FIFO128"

Documentation/devicetree/bindings/serial/renesas,sci-serial.txt

@@ -41,6 +41,8 @@ Required properties:
     - "renesas,hscif-r8a7795" for R8A7795 (R-Car H3) HSCIF compatible UART.
     - "renesas,scif-r8a7796" for R8A7796 (R-Car M3-W) SCIF compatible UART.
     - "renesas,hscif-r8a7796" for R8A7796 (R-Car M3-W) HSCIF compatible UART.
+    - "renesas,scif-r8a77995" for R8A77995 (R-Car D3) SCIF compatible UART.
+    - "renesas,hscif-r8a77995" for R8A77995 (R-Car D3) HSCIF compatible UART.
     - "renesas,scifa-sh73a0" for SH73A0 (SH-Mobile AG5) SCIFA compatible UART.
     - "renesas,scifb-sh73a0" for SH73A0 (SH-Mobile AG5) SCIFB compatible UART.
     - "renesas,rcar-gen1-scif" for R-Car Gen1 SCIF compatible UART,

Documentation/devicetree/bindings/serial/rs485.txt

@@ -5,14 +5,13 @@ the built-in half-duplex mode.
 The properties described hereafter shall be given to a half-duplex capable
 UART node.
 
-Required properties:
+Optional properties:
 - rs485-rts-delay: prop-encoded-array <a b> where:
   * a is the delay between rts signal and beginning of data sent in milliseconds.
       it corresponds to the delay before sending data.
   * b is the delay between end of data sent and rts signal in milliseconds
       it corresponds to the delay after sending data and actual release of the line.
-
+  If this property is not specified, <0 0> is assumed.
-Optional properties:
 - linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485
   feature at boot time. It can be disabled later with proper ioctl.
 - rs485-rx-during-tx: empty property that enables the receiving of data even

Documentation/devicetree/bindings/serial/st,stm32-usart.txt

@@ -1,12 +1,19 @@
 * STMicroelectronics STM32 USART
 
 Required properties:
-- compatible: Can be either "st,stm32-usart", "st,stm32-uart",
+- compatible: can be either:
-"st,stm32f7-usart" or "st,stm32f7-uart" depending on whether
+  - "st,stm32-usart",
-the device supports synchronous mode and is compatible with
+  - "st,stm32-uart",
-stm32(f4) or stm32f7.
+  - "st,stm32f7-usart",
+  - "st,stm32f7-uart",
+  - "st,stm32h7-usart"
+  - "st,stm32h7-uart".
+  depending on whether the device supports synchronous mode
+  and is compatible with stm32(f4), stm32f7 or stm32h7.
 - reg: The address and length of the peripheral registers space
-- interrupts: The interrupt line of the USART instance
+- interrupts:
+  - The interrupt line for the USART instance,
+  - An optional wake-up interrupt.
 - clocks: The input clock of the USART instance
 
 Optional properties:

drivers/mcb/mcb-core.c

@@ -417,6 +417,22 @@ void mcb_bus_add_devices(const struct mcb_bus *bus)
 }
 EXPORT_SYMBOL_GPL(mcb_bus_add_devices);
 
+/**
+ * mcb_get_resource() - get a resource for a mcb device
+ * @dev: the mcb device
+ * @type: the type of resource
+ */
+struct resource *mcb_get_resource(struct mcb_device *dev, unsigned int type)
+{
+	if (type == IORESOURCE_MEM)
+		return &dev->mem;
+	else if (type == IORESOURCE_IRQ)
+		return &dev->irq;
+	else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(mcb_get_resource);
+
 /**
  * mcb_request_mem() - Request memory
  * @dev: The @mcb_device the memory is for
@@ -460,7 +476,9 @@ EXPORT_SYMBOL_GPL(mcb_release_mem);
 
 static int __mcb_get_irq(struct mcb_device *dev)
 {
-	struct resource *irq = &dev->irq;
+	struct resource *irq;
+
+	irq = mcb_get_resource(dev, IORESOURCE_IRQ);
 
 	return irq->start;
 }

drivers/tty/Kconfig

@@ -392,6 +392,9 @@ config PPC_EARLY_DEBUG_EHV_BC_HANDLE
 config GOLDFISH_TTY
 	tristate "Goldfish TTY Driver"
 	depends on GOLDFISH
+	select SERIAL_CORE
+	select SERIAL_CORE_CONSOLE
+	select SERIAL_EARLYCON
 	help
 	  Console and system TTY driver for the Goldfish virtual platform.
 

drivers/tty/ehv_bytechan.c

@@ -122,7 +122,7 @@ static int find_console_handle(void)
 
 	stdout_irq = irq_of_parse_and_map(np, 0);
 	if (stdout_irq == NO_IRQ) {
-		pr_err("ehv-bc: no 'interrupts' property in %s node\n", np->full_name);
+		pr_err("ehv-bc: no 'interrupts' property in %pOF node\n", np);
 		return 0;
 	}
 

drivers/tty/goldfish.c

@@ -1,6 +1,7 @@
 /*
  * Copyright (C) 2007 Google, Inc.
  * Copyright (C) 2012 Intel, Inc.
+ * Copyright (C) 2017 Imagination Technologies Ltd.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
@@ -22,21 +23,23 @@
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/goldfish.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/serial_core.h>
 
-enum {
+/* Goldfish tty register's offsets */
-	GOLDFISH_TTY_PUT_CHAR       = 0x00,
+#define	GOLDFISH_TTY_REG_BYTES_READY	0x04
-	GOLDFISH_TTY_BYTES_READY    = 0x04,
+#define	GOLDFISH_TTY_REG_CMD		0x08
-	GOLDFISH_TTY_CMD            = 0x08,
+#define	GOLDFISH_TTY_REG_DATA_PTR	0x10
+#define	GOLDFISH_TTY_REG_DATA_LEN	0x14
+#define	GOLDFISH_TTY_REG_DATA_PTR_HIGH	0x18
+#define	GOLDFISH_TTY_REG_VERSION	0x20
 
-	GOLDFISH_TTY_DATA_PTR       = 0x10,
+/* Goldfish tty commands */
-	GOLDFISH_TTY_DATA_LEN       = 0x14,
+#define	GOLDFISH_TTY_CMD_INT_DISABLE	0
-	GOLDFISH_TTY_DATA_PTR_HIGH  = 0x18,
+#define	GOLDFISH_TTY_CMD_INT_ENABLE	1
-
+#define	GOLDFISH_TTY_CMD_WRITE_BUFFER	2
-	GOLDFISH_TTY_CMD_INT_DISABLE    = 0,
+#define	GOLDFISH_TTY_CMD_READ_BUFFER	3
-	GOLDFISH_TTY_CMD_INT_ENABLE     = 1,
-	GOLDFISH_TTY_CMD_WRITE_BUFFER   = 2,
-	GOLDFISH_TTY_CMD_READ_BUFFER    = 3,
-};
 
 struct goldfish_tty {
 	struct tty_port port;
@@ -45,6 +48,8 @@ struct goldfish_tty {
 	u32 irq;
 	int opencount;
 	struct console console;
+	u32 version;
+	struct device *dev;
 };
 
 static DEFINE_MUTEX(goldfish_tty_lock);
@@ -53,38 +58,107 @@ static u32 goldfish_tty_line_count = 8;
 static u32 goldfish_tty_current_line_count;
 static struct goldfish_tty *goldfish_ttys;
 
-static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
+static void do_rw_io(struct goldfish_tty *qtty,
+		     unsigned long address,
+		     unsigned int count,
+		     int is_write)
 {
 	unsigned long irq_flags;
-	struct goldfish_tty *qtty = &goldfish_ttys[line];
 	void __iomem *base = qtty->base;
+
 	spin_lock_irqsave(&qtty->lock, irq_flags);
-	gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
+	gf_write_ptr((void *)address, base + GOLDFISH_TTY_REG_DATA_PTR,
-				base + GOLDFISH_TTY_DATA_PTR_HIGH);
+		     base + GOLDFISH_TTY_REG_DATA_PTR_HIGH);
-	writel(count, base + GOLDFISH_TTY_DATA_LEN);
+	writel(count, base + GOLDFISH_TTY_REG_DATA_LEN);
-	writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
+
+	if (is_write)
+		writel(GOLDFISH_TTY_CMD_WRITE_BUFFER,
+		       base + GOLDFISH_TTY_REG_CMD);
+	else
+		writel(GOLDFISH_TTY_CMD_READ_BUFFER,
+		       base + GOLDFISH_TTY_REG_CMD);
+
 	spin_unlock_irqrestore(&qtty->lock, irq_flags);
 }
 
+static void goldfish_tty_rw(struct goldfish_tty *qtty,
+			    unsigned long addr,
+			    unsigned int count,
+			    int is_write)
+{
+	dma_addr_t dma_handle;
+	enum dma_data_direction dma_dir;
+
+	dma_dir = (is_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+	if (qtty->version > 0) {
+		/*
+		 * Goldfish TTY for Ranchu platform uses
+		 * physical addresses and DMA for read/write operations
+		 */
+		unsigned long addr_end = addr + count;
+
+		while (addr < addr_end) {
+			unsigned long pg_end = (addr & PAGE_MASK) + PAGE_SIZE;
+			unsigned long next =
+					pg_end < addr_end ? pg_end : addr_end;
+			unsigned long avail = next - addr;
+
+			/*
+			 * Map the buffer's virtual address to the DMA address
+			 * so the buffer can be accessed by the device.
+			 */
+			dma_handle = dma_map_single(qtty->dev, (void *)addr,
+						    avail, dma_dir);
+
+			if (dma_mapping_error(qtty->dev, dma_handle)) {
+				dev_err(qtty->dev, "tty: DMA mapping error.\n");
+				return;
+			}
+			do_rw_io(qtty, dma_handle, avail, is_write);
+
+			/*
+			 * Unmap the previously mapped region after
+			 * the completion of the read/write operation.
+			 */
+			dma_unmap_single(qtty->dev, dma_handle, avail, dma_dir);
+
+			addr += avail;
+		}
+	} else {
+		/*
+		 * Old style Goldfish TTY used on the Goldfish platform
+		 * uses virtual addresses.
+		 */
+		do_rw_io(qtty, addr, count, is_write);
+	}
+}
+
+static void goldfish_tty_do_write(int line, const char *buf,
+				  unsigned int count)
+{
+	struct goldfish_tty *qtty = &goldfish_ttys[line];
+	unsigned long address = (unsigned long)(void *)buf;
+
+	goldfish_tty_rw(qtty, address, count, 1);
+}
+
 static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)
 {
 	struct goldfish_tty *qtty = dev_id;
 	void __iomem *base = qtty->base;
-	unsigned long irq_flags;
+	unsigned long address;
 	unsigned char *buf;
 	u32 count;
 
-	count = readl(base + GOLDFISH_TTY_BYTES_READY);
+	count = readl(base + GOLDFISH_TTY_REG_BYTES_READY);
 	if (count == 0)
 		return IRQ_NONE;
 
 	count = tty_prepare_flip_string(&qtty->port, &buf, count);
-	spin_lock_irqsave(&qtty->lock, irq_flags);
+
-	gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
+	address = (unsigned long)(void *)buf;
-				base + GOLDFISH_TTY_DATA_PTR_HIGH);
+	goldfish_tty_rw(qtty, address, count, 0);
-	writel(count, base + GOLDFISH_TTY_DATA_LEN);
+
-	writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
-	spin_unlock_irqrestore(&qtty->lock, irq_flags);
 	tty_schedule_flip(&qtty->port);
 	return IRQ_HANDLED;
 }
@@ -93,7 +167,7 @@ static int goldfish_tty_activate(struct tty_port *port, struct tty_struct *tty)
 {
 	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
 									port);
-	writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_CMD);
+	writel(GOLDFISH_TTY_CMD_INT_ENABLE, qtty->base + GOLDFISH_TTY_REG_CMD);
 	return 0;
 }
 
@@ -101,7 +175,7 @@ static void goldfish_tty_shutdown(struct tty_port *port)
 {
 	struct goldfish_tty *qtty = container_of(port, struct goldfish_tty,
 									port);
-	writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_CMD);
+	writel(GOLDFISH_TTY_CMD_INT_DISABLE, qtty->base + GOLDFISH_TTY_REG_CMD);
 }
 
 static int goldfish_tty_open(struct tty_struct *tty, struct file *filp)
@@ -136,7 +210,7 @@ static int goldfish_tty_chars_in_buffer(struct tty_struct *tty)
 {
 	struct goldfish_tty *qtty = &goldfish_ttys[tty->index];
 	void __iomem *base = qtty->base;
-	return readl(base + GOLDFISH_TTY_BYTES_READY);
+	return readl(base + GOLDFISH_TTY_REG_BYTES_READY);
 }
 
 static void goldfish_tty_console_write(struct console *co, const char *b,
@@ -227,7 +301,7 @@ static void goldfish_tty_delete_driver(void)
 static int goldfish_tty_probe(struct platform_device *pdev)
 {
 	struct goldfish_tty *qtty;
-	int ret = -EINVAL;
+	int ret = -ENODEV;
 	struct resource *r;
 	struct device *ttydev;
 	void __iomem *base;
@@ -235,16 +309,22 @@ static int goldfish_tty_probe(struct platform_device *pdev)
 	unsigned int line;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (r == NULL)
+	if (!r) {
-		return -EINVAL;
+		pr_err("goldfish_tty: No MEM resource available!\n");
+		return -ENOMEM;
+	}
 
 	base = ioremap(r->start, 0x1000);
-	if (base == NULL)
+	if (!base) {
-		pr_err("goldfish_tty: unable to remap base\n");
+		pr_err("goldfish_tty: Unable to ioremap base!\n");
+		return -ENOMEM;
+	}
 
 	r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (r == NULL)
+	if (!r) {
+		pr_err("goldfish_tty: No IRQ resource available!\n");
 		goto err_unmap;
+	}
 
 	irq = r->start;
 
@@ -255,13 +335,17 @@ static int goldfish_tty_probe(struct platform_device *pdev)
 	else
 		line = pdev->id;
 
-	if (line >= goldfish_tty_line_count)
+	if (line >= goldfish_tty_line_count) {
-		goto err_create_driver_failed;
+		pr_err("goldfish_tty: Reached maximum tty number of %d.\n",
+		       goldfish_tty_current_line_count);
+		ret = -ENOMEM;
+		goto err_unlock;
+	}
 
 	if (goldfish_tty_current_line_count == 0) {
 		ret = goldfish_tty_create_driver();
 		if (ret)
-			goto err_create_driver_failed;
+			goto err_unlock;
 	}
 	goldfish_tty_current_line_count++;
 
@@ -271,17 +355,45 @@ static int goldfish_tty_probe(struct platform_device *pdev)
 	qtty->port.ops = &goldfish_port_ops;
 	qtty->base = base;
 	qtty->irq = irq;
+	qtty->dev = &pdev->dev;
 
-	writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_CMD);
+	/*
+	 * Goldfish TTY device used by the Goldfish emulator
+	 * should identify itself with 0, forcing the driver
+	 * to use virtual addresses. Goldfish TTY device
+	 * on Ranchu emulator (qemu2) returns 1 here and
+	 * driver will use physical addresses.
+	 */
+	qtty->version = readl(base + GOLDFISH_TTY_REG_VERSION);
+
+	/*
+	 * Goldfish TTY device on Ranchu emulator (qemu2)
+	 * will use DMA for read/write IO operations.
+	 */
+	if (qtty->version > 0) {
+		/*
+		 * Initialize dma_mask to 32-bits.
+		 */
+		if (!pdev->dev.dma_mask)
+			pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+		ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_err(&pdev->dev, "No suitable DMA available.\n");
+			goto err_dec_line_count;
+		}
+	}
+
+	writel(GOLDFISH_TTY_CMD_INT_DISABLE, base + GOLDFISH_TTY_REG_CMD);
 
 	ret = request_irq(irq, goldfish_tty_interrupt, IRQF_SHARED,
-						"goldfish_tty", qtty);
+			  "goldfish_tty", qtty);
-	if (ret)
+	if (ret) {
-		goto err_request_irq_failed;
+		pr_err("goldfish_tty: No IRQ available!\n");
-
+		goto err_dec_line_count;
+	}
 
 	ttydev = tty_port_register_device(&qtty->port, goldfish_tty_driver,
-							line, &pdev->dev);
+					  line, &pdev->dev);
 	if (IS_ERR(ttydev)) {
 		ret = PTR_ERR(ttydev);
 		goto err_tty_register_device_failed;
@@ -301,11 +413,11 @@ static int goldfish_tty_probe(struct platform_device *pdev)
 
 err_tty_register_device_failed:
 	free_irq(irq, qtty);
-err_request_irq_failed:
+err_dec_line_count:
 	goldfish_tty_current_line_count--;
 	if (goldfish_tty_current_line_count == 0)
 		goldfish_tty_delete_driver();
-err_create_driver_failed:
+err_unlock:
 	mutex_unlock(&goldfish_tty_lock);
 err_unmap:
 	iounmap(base);
@@ -330,6 +442,30 @@ static int goldfish_tty_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void gf_early_console_putchar(struct uart_port *port, int ch)
+{
+	__raw_writel(ch, port->membase);
+}
+
+static void gf_early_write(struct console *con, const char *s, unsigned int n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, gf_early_console_putchar);
+}
+
+static int __init gf_earlycon_setup(struct earlycon_device *device,
+				    const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	device->con->write = gf_early_write;
+	return 0;
+}
+
+OF_EARLYCON_DECLARE(early_gf_tty, "google,goldfish-tty", gf_earlycon_setup);
+
 static const struct of_device_id goldfish_tty_of_match[] = {
 	{ .compatible = "google,goldfish-tty", },
 	{},

drivers/tty/hvc/hvc_opal.c

@@ -179,8 +179,8 @@ static int hvc_opal_probe(struct platform_device *dev)
 		proto = HV_PROTOCOL_HVSI;
 		ops = &hvc_opal_hvsi_ops;
 	} else {
-		pr_err("hvc_opal: Unknown protocol for %s\n",
+		pr_err("hvc_opal: Unknown protocol for %pOF\n",
-		       dev->dev.of_node->full_name);
+		       dev->dev.of_node);
 		return -ENXIO;
 	}
 
@@ -204,14 +204,14 @@ static int hvc_opal_probe(struct platform_device *dev)
 		/* Instanciate now to establish a mapping index==vtermno */
 		hvc_instantiate(termno, termno, ops);
 	} else {
-		pr_err("hvc_opal: Device %s has duplicate terminal number #%d\n",
+		pr_err("hvc_opal: Device %pOF has duplicate terminal number #%d\n",
-		       dev->dev.of_node->full_name, termno);
+		       dev->dev.of_node, termno);
 		return -ENXIO;
 	}
 
-	pr_info("hvc%d: %s protocol on %s%s\n", termno,
+	pr_info("hvc%d: %s protocol on %pOF%s\n", termno,
 		proto == HV_PROTOCOL_RAW ? "raw" : "hvsi",
-		dev->dev.of_node->full_name,
+		dev->dev.of_node,
 		boot ? " (boot console)" : "");
 
 	irq = irq_of_parse_and_map(dev->dev.of_node, 0);
@@ -222,8 +222,8 @@ static int hvc_opal_probe(struct platform_device *dev)
 	}
 
 	if (!irq) {
-		pr_err("hvc_opal: Unable to map interrupt for device %s\n",
+		pr_err("hvc_opal: Unable to map interrupt for device %pOF\n",
-			dev->dev.of_node->full_name);
+			dev->dev.of_node);
 		return irq;
 	}
 

drivers/tty/hvc/hvc_vio.c

@@ -53,7 +53,7 @@
 
 static const char hvc_driver_name[] = "hvc_console";
 
-static struct vio_device_id hvc_driver_table[] = {
+static const struct vio_device_id hvc_driver_table[] = {
 	{"serial", "hvterm1"},
 #ifndef HVC_OLD_HVSI
 	{"serial", "hvterm-protocol"},
@@ -312,12 +312,12 @@ static int hvc_vio_probe(struct vio_dev *vdev,
 		proto = HV_PROTOCOL_HVSI;
 		ops = &hvterm_hvsi_ops;
 	} else {
-		pr_err("hvc_vio: Unknown protocol for %s\n", vdev->dev.of_node->full_name);
+		pr_err("hvc_vio: Unknown protocol for %pOF\n", vdev->dev.of_node);
 		return -ENXIO;
 	}
 
-	pr_devel("hvc_vio_probe() device %s, using %s protocol\n",
+	pr_devel("hvc_vio_probe() device %pOF, using %s protocol\n",
-		 vdev->dev.of_node->full_name,
+		 vdev->dev.of_node,
 		 proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
 
 	/* Is it our boot one ? */

drivers/tty/hvc/hvcs.c

@@ -189,7 +189,7 @@ MODULE_VERSION(HVCS_DRIVER_VERSION);
  * that will cause echoing or we'll go into recursive loop echoing chars back
  * and forth with the console drivers.
  */
-static struct ktermios hvcs_tty_termios = {
+static const struct ktermios hvcs_tty_termios = {
 	.c_iflag = IGNBRK | IGNPAR,
 	.c_oflag = OPOST,
 	.c_cflag = B38400 | CS8 | CREAD | HUPCL,
@@ -675,7 +675,7 @@ static int khvcsd(void *unused)
 	return 0;
 }
 
-static struct vio_device_id hvcs_driver_table[] = {
+static const struct vio_device_id hvcs_driver_table[] = {
 	{"serial-server", "hvterm2"},
 	{ "", "" }
 };

drivers/tty/isicom.c

@@ -150,7 +150,7 @@
 static int isicom_probe(struct pci_dev *, const struct pci_device_id *);
 static void isicom_remove(struct pci_dev *);
 
-static struct pci_device_id isicom_pci_tbl[] = {
+static const struct pci_device_id isicom_pci_tbl[] = {
 	{ PCI_DEVICE(VENDOR_ID, 0x2028) },
 	{ PCI_DEVICE(VENDOR_ID, 0x2051) },
 	{ PCI_DEVICE(VENDOR_ID, 0x2052) },

drivers/tty/mips_ejtag_fdc.c

@@ -1110,7 +1110,7 @@ static int mips_ejtag_fdc_tty_cpu_up(struct mips_cdmm_device *dev)
 	return ret;
 }
 
-static struct mips_cdmm_device_id mips_ejtag_fdc_tty_ids[] = {
+static const struct mips_cdmm_device_id mips_ejtag_fdc_tty_ids[] = {
 	{ .type = 0xfd },
 	{ }
 };

drivers/tty/moxa.c

@@ -88,7 +88,7 @@ static char *moxa_brdname[] =
 };
 
 #ifdef CONFIG_PCI
-static struct pci_device_id moxa_pcibrds[] = {
+static const struct pci_device_id moxa_pcibrds[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
 		.driver_data = MOXA_BOARD_C218_PCI },
 	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),

drivers/tty/mxser.c

@@ -145,7 +145,7 @@ static const struct mxser_cardinfo mxser_cards[] = {
 
 /* driver_data correspond to the lines in the structure above
    see also ISA probe function before you change something */
-static struct pci_device_id mxser_pcibrds[] = {
+static const struct pci_device_id mxser_pcibrds[] = {
 	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),	.driver_data = 3 },
 	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),	.driver_data = 4 },
 	{ PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),	.driver_data = 8 },

drivers/tty/n_gsm.c

@@ -2607,6 +2607,14 @@ static int gsmld_ioctl(struct tty_struct *tty, struct file *file,
 	}
 }
 
+#ifdef CONFIG_COMPAT
+static long gsmld_compat_ioctl(struct tty_struct *tty, struct file *file,
+		       unsigned int cmd, unsigned long arg)
+{
+	return gsmld_ioctl(tty, file, cmd, arg);
+}
+#endif
+
 /*
  *	Network interface
  *
@@ -2818,6 +2826,9 @@ static struct tty_ldisc_ops tty_ldisc_packet = {
 	.flush_buffer    = gsmld_flush_buffer,
 	.read            = gsmld_read,
 	.write           = gsmld_write,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl    = gsmld_compat_ioctl,
+#endif
 	.ioctl           = gsmld_ioctl,
 	.poll            = gsmld_poll,
 	.receive_buf     = gsmld_receive_buf,

drivers/tty/pty.c

@@ -742,6 +742,11 @@ static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
 	}
 }
 
+static void pty_show_fdinfo(struct tty_struct *tty, struct seq_file *m)
+{
+	seq_printf(m, "tty-index:\t%d\n", tty->index);
+}
+
 static const struct tty_operations ptm_unix98_ops = {
 	.lookup = ptm_unix98_lookup,
 	.install = pty_unix98_install,
@@ -756,7 +761,8 @@ static const struct tty_operations ptm_unix98_ops = {
 	.ioctl = pty_unix98_ioctl,
 	.compat_ioctl = pty_unix98_compat_ioctl,
 	.resize = pty_resize,
-	.cleanup = pty_cleanup
+	.cleanup = pty_cleanup,
+	.show_fdinfo = pty_show_fdinfo,
 };
 
 static const struct tty_operations pty_unix98_ops = {

drivers/tty/serdev/core.c

@@ -363,7 +363,7 @@ static int of_serdev_register_devices(struct serdev_controller *ctrl)
 		if (!of_get_property(node, "compatible", NULL))
 			continue;
 
-		dev_dbg(&ctrl->dev, "adding child %s\n", node->full_name);
+		dev_dbg(&ctrl->dev, "adding child %pOF\n", node);
 
 		serdev = serdev_device_alloc(ctrl);
 		if (!serdev)

drivers/tty/serial/21285.c

@@ -334,7 +334,7 @@ static int serial21285_verify_port(struct uart_port *port, struct serial_struct
 	return ret;
 }
 
-static struct uart_ops serial21285_ops = {
+static const struct uart_ops serial21285_ops = {
 	.tx_empty	= serial21285_tx_empty,
 	.get_mctrl	= serial21285_get_mctrl,
 	.set_mctrl	= serial21285_set_mctrl,

drivers/tty/serial/8250/8250_aspeed_vuart.c

@@ -223,12 +223,13 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 		if (IS_ERR(vuart->clk)) {
 			dev_warn(&pdev->dev,
 				"clk or clock-frequency not defined\n");
-			return PTR_ERR(vuart->clk);
+			rc = PTR_ERR(vuart->clk);
+			goto err_sysfs_remove;
 		}
 
 		rc = clk_prepare_enable(vuart->clk);
 		if (rc < 0)
-			return rc;
+			goto err_sysfs_remove;
 
 		clk = clk_get_rate(vuart->clk);
 	}
@@ -286,6 +287,8 @@ static int aspeed_vuart_probe(struct platform_device *pdev)
 err_clk_disable:
 	clk_disable_unprepare(vuart->clk);
 	irq_dispose_mapping(port.port.irq);
+err_sysfs_remove:
+	sysfs_remove_group(&vuart->dev->kobj, &aspeed_vuart_attr_group);
 	return rc;
 }
 

drivers/tty/serial/8250/8250_core.c

@@ -497,6 +497,11 @@ static void univ8250_rsa_support(struct uart_ops *ops)
 #define univ8250_rsa_support(x)		do { } while (0)
 #endif /* CONFIG_SERIAL_8250_RSA */
 
+static inline void serial8250_apply_quirks(struct uart_8250_port *up)
+{
+	up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0;
+}
+
 static void __init serial8250_isa_init_ports(void)
 {
 	struct uart_8250_port *up;
@@ -577,9 +582,7 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev)
 
 		up->port.dev = dev;
 
-		if (skip_txen_test)
+		serial8250_apply_quirks(up);
-			up->port.flags |= UPF_NO_TXEN_TEST;
-
 		uart_add_one_port(drv, &up->port);
 	}
 }
@@ -1006,9 +1009,6 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
 		if (up->port.dev)
 			uart->port.dev = up->port.dev;
 
-		if (skip_txen_test)
-			uart->port.flags |= UPF_NO_TXEN_TEST;
-
 		if (up->port.flags & UPF_FIXED_TYPE)
 			uart->port.type = up->port.type;
 
@@ -1048,6 +1048,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
 				serial8250_isa_config(0, &uart->port,
 						&uart->capabilities);
 
+			serial8250_apply_quirks(uart);
 			ret = uart_add_one_port(&serial8250_reg,
 						&uart->port);
 			if (ret == 0)
@@ -1092,11 +1093,10 @@ void serial8250_unregister_port(int line)
 	uart_remove_one_port(&serial8250_reg, &uart->port);
 	if (serial8250_isa_devs) {
 		uart->port.flags &= ~UPF_BOOT_AUTOCONF;
-		if (skip_txen_test)
-			uart->port.flags |= UPF_NO_TXEN_TEST;
 		uart->port.type = PORT_UNKNOWN;
 		uart->port.dev = &serial8250_isa_devs->dev;
 		uart->capabilities = 0;
+		serial8250_apply_quirks(uart);
 		uart_add_one_port(&serial8250_reg, &uart->port);
 	} else {
 		uart->port.dev = NULL;

drivers/tty/serial/8250/8250_dw.c

@@ -529,7 +529,7 @@ static int dw8250_probe(struct platform_device *pdev)
 		}
 	}
 
-	data->rst = devm_reset_control_get_optional(dev, NULL);
+	data->rst = devm_reset_control_get_optional_exclusive(dev, NULL);
 	if (IS_ERR(data->rst)) {
 		err = PTR_ERR(data->rst);
 		goto err_pclk;

drivers/tty/serial/8250/8250_early.c

@@ -37,7 +37,7 @@
 #include <asm/io.h>
 #include <asm/serial.h>
 
-static unsigned int __init serial8250_early_in(struct uart_port *port, int offset)
+static unsigned int serial8250_early_in(struct uart_port *port, int offset)
 {
 	int reg_offset = offset;
 	offset <<= port->regshift;
@@ -60,7 +60,7 @@ 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)
+static void serial8250_early_out(struct uart_port *port, int offset, int value)
 {
 	int reg_offset = offset;
 	offset <<= port->regshift;
@@ -89,7 +89,7 @@ static void __init serial8250_early_out(struct uart_port *port, int offset, int
 
 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 
-static void __init serial_putc(struct uart_port *port, int c)
+static void serial_putc(struct uart_port *port, int c)
 {
 	unsigned int status;
 
@@ -103,7 +103,7 @@ static void __init serial_putc(struct uart_port *port, int c)
 	}
 }
 
-static void __init early_serial8250_write(struct console *console,
+static void early_serial8250_write(struct console *console,
 					const char *s, unsigned int count)
 {
 	struct earlycon_device *device = console->data;

drivers/tty/serial/8250/8250_exar.c

@@ -601,7 +601,7 @@ static const struct exar8250_board pbn_exar_XR17V8358 = {
 		(kernel_ulong_t)&bd			\
 	}
 
-static struct pci_device_id exar_pci_tbl[] = {
+static const struct pci_device_id exar_pci_tbl[] = {
 	CONNECT_DEVICE(XR17C152, UART_2_232, pbn_connect),
 	CONNECT_DEVICE(XR17C154, UART_4_232, pbn_connect),
 	CONNECT_DEVICE(XR17C158, UART_8_232, pbn_connect),

drivers/tty/serial/8250/8250_ingenic.c

@@ -50,17 +50,17 @@ static const struct of_device_id of_match[];
 
 static struct earlycon_device *early_device;
 
-static uint8_t __init early_in(struct uart_port *port, int offset)
+static uint8_t early_in(struct uart_port *port, int offset)
 {
 	return readl(port->membase + (offset << 2));
 }
 
-static void __init early_out(struct uart_port *port, int offset, uint8_t value)
+static void early_out(struct uart_port *port, int offset, uint8_t value)
 {
 	writel(value, port->membase + (offset << 2));
 }
 
-static void __init ingenic_early_console_putc(struct uart_port *port, int c)
+static void ingenic_early_console_putc(struct uart_port *port, int c)
 {
 	uint8_t lsr;
 
@@ -71,7 +71,7 @@ static void __init ingenic_early_console_putc(struct uart_port *port, int c)
 	early_out(port, UART_TX, c);
 }
 
-static void __init ingenic_early_console_write(struct console *console,
+static void ingenic_early_console_write(struct console *console,
 					      const char *s, unsigned int count)
 {
 	uart_console_write(&early_device->port, s, count,

drivers/tty/serial/8250/8250_men_mcb.c

@@ -0,0 +1,118 @@
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mcb.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+#include <uapi/linux/serial_core.h>
+
+struct serial_8250_men_mcb_data {
+	struct uart_8250_port uart;
+	int line;
+};
+
+/*
+ * The Z125 16550-compatible UART has no fixed base clock assigned
+ * So, depending on the board we're on, we need to adjust the
+ * parameter in order to really set the correct baudrate, and
+ * do so if possible without user interaction
+ */
+static u32 men_z125_lookup_uartclk(struct mcb_device *mdev)
+{
+	/* use default value if board is not available below */
+	u32 clkval = 1041666;
+
+	dev_info(&mdev->dev, "%s on board %s\n",
+		dev_name(&mdev->dev),
+		mdev->bus->name);
+	if  (strncmp(mdev->bus->name, "F075", 4) == 0)
+		clkval = 1041666;
+	else if  (strncmp(mdev->bus->name, "F216", 4) == 0)
+		clkval = 1843200;
+	else if (strncmp(mdev->bus->name, "G215", 4) == 0)
+		clkval = 1843200;
+	else
+		dev_info(&mdev->dev,
+			 "board not detected, using default uartclk\n");
+
+	clkval = clkval  << 4;
+
+	return clkval;
+}
+
+static int serial_8250_men_mcb_probe(struct mcb_device *mdev,
+				     const struct mcb_device_id *id)
+{
+	struct serial_8250_men_mcb_data *data;
+	struct resource *mem;
+
+	data = devm_kzalloc(&mdev->dev,
+			    sizeof(struct serial_8250_men_mcb_data),
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	mcb_set_drvdata(mdev, data);
+	data->uart.port.dev = mdev->dma_dev;
+	spin_lock_init(&data->uart.port.lock);
+
+	data->uart.port.type = PORT_16550;
+	data->uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
+	data->uart.port.iotype = UPIO_MEM;
+	data->uart.port.uartclk = men_z125_lookup_uartclk(mdev);
+	data->uart.port.regshift = 0;
+	data->uart.port.fifosize = 60;
+
+	mem = mcb_get_resource(mdev, IORESOURCE_MEM);
+	if (mem == NULL)
+		return -ENXIO;
+
+	data->uart.port.irq = mcb_get_irq(mdev);
+
+	data->uart.port.membase = devm_ioremap_resource(&mdev->dev, mem);
+	if (IS_ERR(data->uart.port.membase))
+		return PTR_ERR_OR_ZERO(data->uart.port.membase);
+
+	data->uart.port.mapbase = (unsigned long) mem->start;
+	data->uart.port.iobase = data->uart.port.mapbase;
+
+	/* ok, register the port */
+	data->line = serial8250_register_8250_port(&data->uart);
+	if (data->line < 0)
+		return data->line;
+
+	dev_info(&mdev->dev, "found 16Z125 UART: ttyS%d\n", data->line);
+
+	return 0;
+}
+
+static void serial_8250_men_mcb_remove(struct mcb_device *mdev)
+{
+	struct serial_8250_men_mcb_data *data = mcb_get_drvdata(mdev);
+
+	if (data)
+		serial8250_unregister_port(data->line);
+}
+
+static const struct mcb_device_id serial_8250_men_mcb_ids[] = {
+	{ .device = 0x7d },
+	{ }
+};
+MODULE_DEVICE_TABLE(mcb, serial_8250_men_mcb_ids);
+
+static struct mcb_driver mcb_driver = {
+	.driver = {
+		.name = "8250_men_mcb",
+		.owner = THIS_MODULE,
+	},
+	.probe = serial_8250_men_mcb_probe,
+	.remove = serial_8250_men_mcb_remove,
+	.id_table = serial_8250_men_mcb_ids,
+};
+module_mcb_driver(mcb_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MEN 16z125 8250 UART driver");
+MODULE_AUTHOR("Michael Moese <michael.moese@men.de");
+MODULE_ALIAS("mcb:16z125");

drivers/tty/serial/8250/8250_mtk.c

@@ -171,10 +171,7 @@ static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p,
 	}
 
 	data->bus_clk = devm_clk_get(&pdev->dev, "bus");
-	if (IS_ERR(data->bus_clk))
+	return PTR_ERR_OR_ZERO(data->bus_clk);
-		return PTR_ERR(data->bus_clk);
-
-	return 0;
 }
 
 static int mtk8250_probe(struct platform_device *pdev)

drivers/tty/serial/8250/8250_of.c

@@ -18,6 +18,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
 #include <linux/clk.h>
 #include <linux/reset.h>
 
@@ -65,6 +66,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	int ret;
 
 	memset(port, 0, sizeof *port);
+
+	pm_runtime_enable(&ofdev->dev);
+	pm_runtime_get_sync(&ofdev->dev);
+
 	if (of_property_read_u32(np, "clock-frequency", &clk)) {
 
 		/* Get clk rate through clk driver if present */
@@ -72,12 +77,13 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 		if (IS_ERR(info->clk)) {
 			dev_warn(&ofdev->dev,
 				"clk or clock-frequency not defined\n");
-			return PTR_ERR(info->clk);
+			ret = PTR_ERR(info->clk);
+			goto err_pmruntime;
 		}
 
 		ret = clk_prepare_enable(info->clk);
 		if (ret < 0)
-			return ret;
+			goto err_pmruntime;
 
 		clk = clk_get_rate(info->clk);
 	}
@@ -88,7 +94,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 	ret = of_address_to_resource(np, 0, &resource);
 	if (ret) {
 		dev_warn(&ofdev->dev, "invalid address\n");
-		goto out;
+		goto err_unprepare;
 	}
 
 	spin_lock_init(&port->lock);
@@ -130,23 +136,23 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 			dev_warn(&ofdev->dev, "unsupported reg-io-width (%d)\n",
 				 prop);
 			ret = -EINVAL;
-			goto out;
+			goto err_dispose;
 		}
 	}
 
 	info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
 	if (IS_ERR(info->rst))
-		goto out;
+		goto err_dispose;
 	ret = reset_control_deassert(info->rst);
 	if (ret)
-		goto out;
+		goto err_dispose;
 
 	port->type = type;
 	port->uartclk = clk;
 	port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP
 		| UPF_FIXED_PORT | UPF_FIXED_TYPE;
 
-	if (of_find_property(np, "no-loopback-test", NULL))
+	if (of_property_read_bool(np, "no-loopback-test"))
 		port->flags |= UPF_SKIP_TEST;
 
 	port->dev = &ofdev->dev;
@@ -167,9 +173,13 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
 		port->handle_irq = fsl8250_handle_irq;
 
 	return 0;
-out:
+err_dispose:
-	if (info->clk)
+	irq_dispose_mapping(port->irq);
-		clk_disable_unprepare(info->clk);
+err_unprepare:
+	clk_disable_unprepare(info->clk);
+err_pmruntime:
+	pm_runtime_put_sync(&ofdev->dev);
+	pm_runtime_disable(&ofdev->dev);
 	return ret;
 }
 
@@ -190,7 +200,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 	if (!match)
 		return -EINVAL;
 
-	if (of_find_property(ofdev->dev.of_node, "used-by-rtas", NULL))
+	if (of_property_read_bool(ofdev->dev.of_node, "used-by-rtas"))
 		return -EBUSY;
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
@@ -201,7 +211,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 	memset(&port8250, 0, sizeof(port8250));
 	ret = of_platform_serial_setup(ofdev, port_type, &port8250.port, info);
 	if (ret)
-		goto out;
+		goto err_free;
 
 	if (port8250.port.fifosize)
 		port8250.capabilities = UART_CAP_FIFO;
@@ -217,15 +227,19 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 
 	ret = serial8250_register_8250_port(&port8250);
 	if (ret < 0)
-		goto out;
+		goto err_dispose;
 
 	info->type = port_type;
 	info->line = ret;
 	platform_set_drvdata(ofdev, info);
 	return 0;
-out:
+err_dispose:
-	kfree(info);
 	irq_dispose_mapping(port8250.port.irq);
+	pm_runtime_put_sync(&ofdev->dev);
+	pm_runtime_disable(&ofdev->dev);
+	clk_disable_unprepare(info->clk);
+err_free:
+	kfree(info);
 	return ret;
 }
 
@@ -239,8 +253,9 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
 	serial8250_unregister_port(info->line);
 
 	reset_control_assert(info->rst);
-	if (info->clk)
+	pm_runtime_put_sync(&ofdev->dev);
-		clk_disable_unprepare(info->clk);
+	pm_runtime_disable(&ofdev->dev);
+	clk_disable_unprepare(info->clk);
 	kfree(info);
 	return 0;
 }
@@ -254,9 +269,10 @@ static int of_serial_suspend(struct device *dev)
 
 	serial8250_suspend_port(info->line);
 
-	if (info->clk && (!uart_console(port) || console_suspend_enabled))
+	if (!uart_console(port) || console_suspend_enabled) {
+		pm_runtime_put_sync(dev);
 		clk_disable_unprepare(info->clk);
-
+	}
 	return 0;
 }
 
@@ -266,8 +282,10 @@ static int of_serial_resume(struct device *dev)
 	struct uart_8250_port *port8250 = serial8250_get_port(info->line);
 	struct uart_port *port = &port8250->port;
 
-	if (info->clk && (!uart_console(port) || console_suspend_enabled))
+	if (!uart_console(port) || console_suspend_enabled) {
+		pm_runtime_get_sync(dev);
 		clk_prepare_enable(info->clk);
+	}
 
 	serial8250_resume_port(info->line);
 
@@ -295,6 +313,8 @@ static const struct of_device_id of_platform_serial_table[] = {
 		.data = (void *)PORT_ALTR_16550_F64, },
 	{ .compatible = "altr,16550-FIFO128",
 		.data = (void *)PORT_ALTR_16550_F128, },
+	{ .compatible = "mediatek,mtk-btif",
+		.data = (void *)PORT_MTK_BTIF, },
 	{ .compatible = "mrvl,mmp-uart",
 		.data = (void *)PORT_XSCALE, },
 	{ .compatible = "ti,da830-uart", .data = (void *)PORT_DA830, },

drivers/tty/serial/8250/8250_pci.c

@@ -1548,7 +1548,7 @@ static int skip_tx_en_setup(struct serial_private *priv,
 			const struct pciserial_board *board,
 			struct uart_8250_port *port, int idx)
 {
-	port->port.flags |= UPF_NO_TXEN_TEST;
+	port->port.quirks |= UPQ_NO_TXEN_TEST;
 	dev_dbg(&priv->dev->dev,
 		"serial8250: skipping TxEn test for device [%04x:%04x] subsystem [%04x:%04x]\n",
 		priv->dev->vendor, priv->dev->device,
@@ -3384,17 +3384,8 @@ static const struct pci_device_id blacklist[] = {
 	{ PCI_VDEVICE(COMMTECH, PCI_ANY_ID), },
 };
 
-/*
+static int serial_pci_is_class_communication(struct pci_dev *dev)
- * Given a complete unknown PCI device, try to use some heuristics to
- * guess what the configuration might be, based on the pitiful PCI
- * serial specs.  Returns 0 on success, 1 on failure.
- */
-static int
-serial_pci_guess_board(struct pci_dev *dev, struct pciserial_board *board)
 {
-	const struct pci_device_id *bldev;
-	int num_iomem, num_port, first_port = -1, i;
-
 	/*
 	 * If it is not a communications device or the programming
 	 * interface is greater than 6, give up.
@@ -3407,6 +3398,13 @@ serial_pci_guess_board(struct pci_dev *dev, struct pciserial_board *board)
 	    (dev->class & 0xff) > 6)
 		return -ENODEV;
 
+	return 0;
+}
+
+static int serial_pci_is_blacklisted(struct pci_dev *dev)
+{
+	const struct pci_device_id *bldev;
+
 	/*
 	 * Do not access blacklisted devices that are known not to
 	 * feature serial ports or are handled by other modules.
@@ -3419,6 +3417,19 @@ serial_pci_guess_board(struct pci_dev *dev, struct pciserial_board *board)
 			return -ENODEV;
 	}
 
+	return 0;
+}
+
+/*
+ * Given a complete unknown PCI device, try to use some heuristics to
+ * guess what the configuration might be, based on the pitiful PCI
+ * serial specs.  Returns 0 on success, -ENODEV on failure.
+ */
+static int
+serial_pci_guess_board(struct pci_dev *dev, struct pciserial_board *board)
+{
+	int num_iomem, num_port, first_port = -1, i;
+
 	num_iomem = num_port = 0;
 	for (i = 0; i < PCI_NUM_BAR_RESOURCES; i++) {
 		if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
@@ -3639,6 +3650,14 @@ pciserial_init_one(struct pci_dev *dev, const struct pci_device_id *ent)
 
 	board = &pci_boards[ent->driver_data];
 
+	rc = serial_pci_is_class_communication(dev);
+	if (rc)
+		return rc;
+
+	rc = serial_pci_is_blacklisted(dev);
+	if (rc)
+		return rc;
+
 	rc = pcim_enable_device(dev);
 	pci_save_state(dev);
 	if (rc)
@@ -3723,7 +3742,7 @@ static int pciserial_resume_one(struct device *dev)
 static SIMPLE_DEV_PM_OPS(pciserial_pm_ops, pciserial_suspend_one,
 			 pciserial_resume_one);
 
-static struct pci_device_id serial_pci_tbl[] = {
+static const struct pci_device_id serial_pci_tbl[] = {
 	/* Advantech use PCI_DEVICE_ID_ADVANTECH_PCI3620 (0x3620) as 'PCI_SUBVENDOR_ID' */
 	{	PCI_VENDOR_ID_ADVANTECH, PCI_DEVICE_ID_ADVANTECH_PCI3620,
 		PCI_DEVICE_ID_ADVANTECH_PCI3620, 0x0001, 0, 0,

drivers/tty/serial/8250/8250_port.c

@@ -37,7 +37,7 @@
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/pm_runtime.h>
-#include <linux/timer.h>
+#include <linux/ktime.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -289,6 +289,14 @@ static const struct serial8250_config uart_config[] = {
 		.rxtrig_bytes	= {1, 4, 8, 14},
 		.flags		= UART_CAP_FIFO | UART_CAP_AFE,
 	},
+	[PORT_MTK_BTIF] = {
+		.name		= "MediaTek BTIF",
+		.fifo_size	= 16,
+		.tx_loadsz	= 16,
+		.fcr		= UART_FCR_ENABLE_FIFO |
+				  UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
+		.flags		= UART_CAP_FIFO,
+	},
 };
 
 /* Uart divisor latch read */
@@ -553,8 +561,8 @@ static inline void serial8250_em485_rts_after_send(struct uart_8250_port *p)
 	serial8250_out_MCR(p, mcr);
 }
 
-static void serial8250_em485_handle_start_tx(unsigned long arg);
+static enum hrtimer_restart serial8250_em485_handle_start_tx(struct hrtimer *t);
-static void serial8250_em485_handle_stop_tx(unsigned long arg);
+static enum hrtimer_restart serial8250_em485_handle_stop_tx(struct hrtimer *t);
 
 void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p)
 {
@@ -609,12 +617,14 @@ int serial8250_em485_init(struct uart_8250_port *p)
 	if (!p->em485)
 		return -ENOMEM;
 
-	setup_timer(&p->em485->stop_tx_timer,
+	hrtimer_init(&p->em485->stop_tx_timer, CLOCK_MONOTONIC,
-		serial8250_em485_handle_stop_tx, (unsigned long)p);
+		     HRTIMER_MODE_REL);
-	setup_timer(&p->em485->start_tx_timer,
+	hrtimer_init(&p->em485->start_tx_timer, CLOCK_MONOTONIC,
-		serial8250_em485_handle_start_tx, (unsigned long)p);
+		     HRTIMER_MODE_REL);
+	p->em485->stop_tx_timer.function = &serial8250_em485_handle_stop_tx;
+	p->em485->start_tx_timer.function = &serial8250_em485_handle_start_tx;
+	p->em485->port = p;
 	p->em485->active_timer = NULL;
-
 	serial8250_em485_rts_after_send(p);
 
 	return 0;
@@ -639,8 +649,8 @@ void serial8250_em485_destroy(struct uart_8250_port *p)
 	if (!p->em485)
 		return;
 
-	del_timer(&p->em485->start_tx_timer);
+	hrtimer_cancel(&p->em485->start_tx_timer);
-	del_timer(&p->em485->stop_tx_timer);
+	hrtimer_cancel(&p->em485->stop_tx_timer);
 
 	kfree(p->em485);
 	p->em485 = NULL;
@@ -1435,22 +1445,33 @@ static void __do_stop_tx_rs485(struct uart_8250_port *p)
 		serial_port_out(&p->port, UART_IER, p->ier);
 	}
 }
-
+static enum hrtimer_restart serial8250_em485_handle_stop_tx(struct hrtimer *t)
-static void serial8250_em485_handle_stop_tx(unsigned long arg)
 {
-	struct uart_8250_port *p = (struct uart_8250_port *)arg;
+	struct uart_8250_em485 *em485;
-	struct uart_8250_em485 *em485 = p->em485;
+	struct uart_8250_port *p;
 	unsigned long flags;
 
+	em485 = container_of(t, struct uart_8250_em485, stop_tx_timer);
+	p = em485->port;
+
 	serial8250_rpm_get(p);
 	spin_lock_irqsave(&p->port.lock, flags);
-	if (em485 &&
+	if (em485->active_timer == &em485->stop_tx_timer) {
-	    em485->active_timer == &em485->stop_tx_timer) {
 		__do_stop_tx_rs485(p);
 		em485->active_timer = NULL;
 	}
 	spin_unlock_irqrestore(&p->port.lock, flags);
 	serial8250_rpm_put(p);
+	return HRTIMER_NORESTART;
+}
+
+static void start_hrtimer_ms(struct hrtimer *hrt, unsigned long msec)
+{
+	long sec = msec / 1000;
+	long nsec = (msec % 1000) * 1000000;
+	ktime_t t = ktime_set(sec, nsec);
+
+	hrtimer_start(hrt, t, HRTIMER_MODE_REL);
 }
 
 static void __stop_tx_rs485(struct uart_8250_port *p)
@@ -1463,8 +1484,8 @@ static void __stop_tx_rs485(struct uart_8250_port *p)
 	 */
 	if (p->port.rs485.delay_rts_after_send > 0) {
 		em485->active_timer = &em485->stop_tx_timer;
-		mod_timer(&em485->stop_tx_timer, jiffies +
+		start_hrtimer_ms(&em485->stop_tx_timer,
-			p->port.rs485.delay_rts_after_send * HZ / 1000);
+				   p->port.rs485.delay_rts_after_send);
 	} else {
 		__do_stop_tx_rs485(p);
 	}
@@ -1494,8 +1515,8 @@ static inline void __stop_tx(struct uart_8250_port *p)
 		if ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
 			return;
 
-		del_timer(&em485->start_tx_timer);
 		em485->active_timer = NULL;
+		hrtimer_cancel(&em485->start_tx_timer);
 
 		__stop_tx_rs485(p);
 	}
@@ -1558,8 +1579,9 @@ static inline void start_tx_rs485(struct uart_port *port)
 	if (!(up->port.rs485.flags & SER_RS485_RX_DURING_TX))
 		serial8250_stop_rx(&up->port);
 
-	del_timer(&em485->stop_tx_timer);
 	em485->active_timer = NULL;
+	if (hrtimer_is_queued(&em485->stop_tx_timer))
+		hrtimer_cancel(&em485->stop_tx_timer);
 
 	mcr = serial8250_in_MCR(up);
 	if (!!(up->port.rs485.flags & SER_RS485_RTS_ON_SEND) !=
@@ -1572,8 +1594,8 @@ static inline void start_tx_rs485(struct uart_port *port)
 
 		if (up->port.rs485.delay_rts_before_send > 0) {
 			em485->active_timer = &em485->start_tx_timer;
-			mod_timer(&em485->start_tx_timer, jiffies +
+			start_hrtimer_ms(&em485->start_tx_timer,
-				up->port.rs485.delay_rts_before_send * HZ / 1000);
+					 up->port.rs485.delay_rts_before_send);
 			return;
 		}
 	}
@@ -1581,19 +1603,22 @@ static inline void start_tx_rs485(struct uart_port *port)
 	__start_tx(port);
 }
 
-static void serial8250_em485_handle_start_tx(unsigned long arg)
+static enum hrtimer_restart serial8250_em485_handle_start_tx(struct hrtimer *t)
 {
-	struct uart_8250_port *p = (struct uart_8250_port *)arg;
+	struct uart_8250_em485 *em485;
-	struct uart_8250_em485 *em485 = p->em485;
+	struct uart_8250_port *p;
 	unsigned long flags;
 
+	em485 = container_of(t, struct uart_8250_em485, start_tx_timer);
+	p = em485->port;
+
 	spin_lock_irqsave(&p->port.lock, flags);
-	if (em485 &&
+	if (em485->active_timer == &em485->start_tx_timer) {
-	    em485->active_timer == &em485->start_tx_timer) {
 		__start_tx(&p->port);
 		em485->active_timer = NULL;
 	}
 	spin_unlock_irqrestore(&p->port.lock, flags);
+	return HRTIMER_NORESTART;
 }
 
 static void serial8250_start_tx(struct uart_port *port)
@@ -2304,7 +2329,7 @@ int serial8250_do_startup(struct uart_port *port)
 	 * test if we receive TX irq.  This way, we'll never enable
 	 * UART_BUG_TXEN.
 	 */
-	if (up->port.flags & UPF_NO_TXEN_TEST)
+	if (up->port.quirks & UPQ_NO_TXEN_TEST)
 		goto dont_test_tx_en;
 
 	/*

drivers/tty/serial/8250/8250_uniphier.c

@@ -29,12 +29,13 @@
  *   - MMIO32 (regshift = 2)
  *   - FCR is not at 2, but 3
  *   - LCR and MCR are not at 3 and 4, they share 4
+ *   - No SCR (Instead, CHAR can be used as a scratch register)
  *   - Divisor latch at 9, no divisor latch access bit
  */
 
 #define UNIPHIER_UART_REGSHIFT		2
 
-/* bit[15:8] = CHAR (not used), bit[7:0] = FCR */
+/* bit[15:8] = CHAR, bit[7:0] = FCR */
 #define UNIPHIER_UART_CHAR_FCR		(3 << (UNIPHIER_UART_REGSHIFT))
 /* bit[15:8] = LCR, bit[7:0] = MCR */
 #define UNIPHIER_UART_LCR_MCR		(4 << (UNIPHIER_UART_REGSHIFT))
@@ -72,13 +73,18 @@ OF_EARLYCON_DECLARE(uniphier, "socionext,uniphier-uart",
 
 /*
  * The register map is slightly different from that of 8250.
- * IO callbacks must be overridden for correct access to FCR, LCR, and MCR.
+ * IO callbacks must be overridden for correct access to FCR, LCR, MCR and SCR.
  */
 static unsigned int uniphier_serial_in(struct uart_port *p, int offset)
 {
 	unsigned int valshift = 0;
 
 	switch (offset) {
+	case UART_SCR:
+		/* No SCR for this hardware.  Use CHAR as a scratch register */
+		valshift = 8;
+		offset = UNIPHIER_UART_CHAR_FCR;
+		break;
 	case UART_LCR:
 		valshift = 8;
 		/* fall through */
@@ -91,8 +97,8 @@ static unsigned int uniphier_serial_in(struct uart_port *p, int offset)
 	}
 
 	/*
-	 * The return value must be masked with 0xff because LCR and MCR reside
+	 * The return value must be masked with 0xff because some registers
-	 * in the same register that must be accessed by 32-bit write/read.
+	 * share the same offset that must be accessed by 32-bit write/read.
 	 * 8 or 16 bit access to this hardware result in unexpected behavior.
 	 */
 	return (readl(p->membase + offset) >> valshift) & 0xff;
@@ -101,9 +107,13 @@ static unsigned int uniphier_serial_in(struct uart_port *p, int offset)
 static void uniphier_serial_out(struct uart_port *p, int offset, int value)
 {
 	unsigned int valshift = 0;
-	bool normal = true;
+	bool normal = false;
 
 	switch (offset) {
+	case UART_SCR:
+		/* No SCR for this hardware.  Use CHAR as a scratch register */
+		valshift = 8;
+		/* fall through */
 	case UART_FCR:
 		offset = UNIPHIER_UART_CHAR_FCR;
 		break;
@@ -114,10 +124,10 @@ static void uniphier_serial_out(struct uart_port *p, int offset, int value)
 		/* fall through */
 	case UART_MCR:
 		offset = UNIPHIER_UART_LCR_MCR;
-		normal = false;
 		break;
 	default:
 		offset <<= UNIPHIER_UART_REGSHIFT;
+		normal = true;
 		break;
 	}
 
@@ -169,7 +179,7 @@ static int uniphier_of_serial_setup(struct device *dev, struct uart_port *port,
 		dev_err(dev, "failed to get alias id\n");
 		return ret;
 	}
-	port->line = priv->line = ret;
+	port->line = ret;
 
 	/* Get clk rate through clk driver */
 	priv->clk = devm_clk_get(dev, NULL);
@@ -249,8 +259,8 @@ static int uniphier_uart_probe(struct platform_device *pdev)
 	up.dl_read = uniphier_serial_dl_read;
 	up.dl_write = uniphier_serial_dl_write;
 
-	ret = serial8250_register_8250_port(&up);
+	priv->line = serial8250_register_8250_port(&up);
-	if (ret < 0) {
+	if (priv->line < 0) {
 		dev_err(dev, "failed to register 8250 port\n");
 		clk_disable_unprepare(priv->clk);
 		return ret;
@@ -271,6 +281,40 @@ static int uniphier_uart_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static int __maybe_unused uniphier_uart_suspend(struct device *dev)
+{
+	struct uniphier8250_priv *priv = dev_get_drvdata(dev);
+	struct uart_8250_port *up = serial8250_get_port(priv->line);
+
+	serial8250_suspend_port(priv->line);
+
+	if (!uart_console(&up->port) || console_suspend_enabled)
+		clk_disable_unprepare(priv->clk);
+
+	return 0;
+}
+
+static int __maybe_unused uniphier_uart_resume(struct device *dev)
+{
+	struct uniphier8250_priv *priv = dev_get_drvdata(dev);
+	struct uart_8250_port *up = serial8250_get_port(priv->line);
+	int ret;
+
+	if (!uart_console(&up->port) || console_suspend_enabled) {
+		ret = clk_prepare_enable(priv->clk);
+		if (ret)
+			return ret;
+	}
+
+	serial8250_resume_port(priv->line);
+
+	return 0;
+}
+
+static const struct dev_pm_ops uniphier_uart_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(uniphier_uart_suspend, uniphier_uart_resume)
+};
+
 static const struct of_device_id uniphier_uart_match[] = {
 	{ .compatible = "socionext,uniphier-uart" },
 	{ /* sentinel */ }
@@ -283,6 +327,7 @@ static struct platform_driver uniphier_uart_platform_driver = {
 	.driver = {
 		.name	= "uniphier-uart",
 		.of_match_table = uniphier_uart_match,
+		.pm = &uniphier_uart_pm_ops,
 	},
 };
 module_platform_driver(uniphier_uart_platform_driver);

drivers/tty/serial/8250/Kconfig

@@ -155,6 +155,17 @@ config SERIAL_8250_CS
 
 	  If unsure, say N.
 
+config SERIAL_8250_MEN_MCB
+	tristate "MEN Z125 UART device support"
+	depends on MCB && SERIAL_8250
+	help
+	  This enables support for FPGA based UARTs found on many MEN
+	  boards. This driver enables support for the Z125 UARTs.
+
+	  To compile this driver as a module, chose M here: the
+	  module will be called 8250_men_mcb.
+
+
 config SERIAL_8250_NR_UARTS
 	int "Maximum number of 8250/16550 serial ports"
 	depends on SERIAL_8250

drivers/tty/serial/8250/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_SERIAL_8250_BOCA)		+= 8250_boca.o
 obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554)	+= 8250_exar_st16c554.o
 obj-$(CONFIG_SERIAL_8250_HUB6)		+= 8250_hub6.o
 obj-$(CONFIG_SERIAL_8250_FSL)		+= 8250_fsl.o
+obj-$(CONFIG_SERIAL_8250_MEN_MCB)	+= 8250_men_mcb.o
 obj-$(CONFIG_SERIAL_8250_DW)		+= 8250_dw.o
 obj-$(CONFIG_SERIAL_8250_EM)		+= 8250_em.o
 obj-$(CONFIG_SERIAL_8250_OMAP)		+= 8250_omap.o

drivers/tty/serial/Kconfig

@@ -1689,7 +1689,7 @@ config SERIAL_MVEBU_CONSOLE
 	  Otherwise, say 'N'.
 
 config SERIAL_OWL
-	bool "Actions Semi Owl serial port support"
+	tristate "Actions Semi Owl serial port support"
 	depends on ARCH_ACTIONS || COMPILE_TEST
 	select SERIAL_CORE
 	help
@@ -1705,7 +1705,7 @@ config SERIAL_OWL_CONSOLE
 	default y
 	help
 	  Say 'Y' here if you wish to use Actions Semiconductor S500/S900 UART
-	  as the system console. Only earlycon is implemented currently.
+	  as the system console.
 
 endmenu
 

drivers/tty/serial/amba-pl010.c

@@ -814,7 +814,7 @@ static int pl010_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(pl010_dev_pm_ops, pl010_suspend, pl010_resume);
 
-static struct amba_id pl010_ids[] = {
+static const struct amba_id pl010_ids[] = {
 	{
 		.id	= 0x00041010,
 		.mask	= 0x000fffff,

drivers/tty/serial/amba-pl011.c

@@ -128,7 +128,7 @@ static struct vendor_data vendor_arm = {
 	.get_fifosize		= get_fifosize_arm,
 };
 
-static struct vendor_data vendor_sbsa = {
+static const struct vendor_data vendor_sbsa = {
 	.reg_offset		= pl011_std_offsets,
 	.fr_busy		= UART01x_FR_BUSY,
 	.fr_dsr			= UART01x_FR_DSR,
@@ -143,7 +143,7 @@ static struct vendor_data vendor_sbsa = {
 };
 
 #ifdef CONFIG_ACPI_SPCR_TABLE
-static struct vendor_data vendor_qdt_qdf2400_e44 = {
+static const struct vendor_data vendor_qdt_qdf2400_e44 = {
 	.reg_offset		= pl011_std_offsets,
 	.fr_busy		= UART011_FR_TXFE,
 	.fr_dsr			= UART01x_FR_DSR,
@@ -2787,7 +2787,7 @@ static struct platform_driver arm_sbsa_uart_platform_driver = {
 	},
 };
 
-static struct amba_id pl011_ids[] = {
+static const struct amba_id pl011_ids[] = {
 	{
 		.id	= 0x00041011,
 		.mask	= 0x000fffff,

drivers/tty/serial/apbuart.c

@@ -325,7 +325,7 @@ static int apbuart_verify_port(struct uart_port *port,
 	return ret;
 }
 
-static struct uart_ops grlib_apbuart_ops = {
+static const struct uart_ops grlib_apbuart_ops = {
 	.tx_empty = apbuart_tx_empty,
 	.set_mctrl = apbuart_set_mctrl,
 	.get_mctrl = apbuart_get_mctrl,

drivers/tty/serial/arc_uart.c

@@ -549,8 +549,8 @@ static struct console arc_console = {
 	.data	= &arc_uart_driver
 };
 
-static __init void arc_early_serial_write(struct console *con, const char *s,
+static void arc_early_serial_write(struct console *con, const char *s,
-					  unsigned int n)
+				   unsigned int n)
 {
 	struct earlycon_device *dev = con->data;
 

drivers/tty/serial/cpm_uart/cpm_uart_core.c

@@ -1123,7 +1123,7 @@ static void cpm_put_poll_char(struct uart_port *port,
 }
 #endif /* CONFIG_CONSOLE_POLL */
 
-static struct uart_ops cpm_uart_pops = {
+static const struct uart_ops cpm_uart_pops = {
 	.tx_empty	= cpm_uart_tx_empty,
 	.set_mctrl	= cpm_uart_set_mctrl,
 	.get_mctrl	= cpm_uart_get_mctrl,

drivers/tty/serial/earlycon.c

@@ -220,7 +220,7 @@ static int __init param_setup_earlycon(char *buf)
 		if (IS_ENABLED(CONFIG_ACPI_SPCR_TABLE)) {
 			earlycon_init_is_deferred = true;
 			return 0;
-		} else {
+		} else if (!buf) {
 			return early_init_dt_scan_chosen_stdout();
 		}
 	}
@@ -282,7 +282,12 @@ int __init of_setup_earlycon(const struct earlycon_id *match,
 		}
 	}
 
+	val = of_get_flat_dt_prop(node, "current-speed", NULL);
+	if (val)
+		early_console_dev.baud = be32_to_cpu(*val);
+
 	if (options) {
+		early_console_dev.baud = simple_strtoul(options, NULL, 0);
 		strlcpy(early_console_dev.options, options,
 			sizeof(early_console_dev.options));
 	}

drivers/tty/serial/fsl_lpuart.c

@@ -117,7 +117,7 @@
 #define UARTSFIFO_TXOF		0x02
 #define UARTSFIFO_RXUF		0x01
 
-/* 32-bit register defination */
+/* 32-bit register definition */
 #define UARTBAUD		0x00
 #define UARTSTAT		0x04
 #define UARTCTRL		0x08
@@ -521,6 +521,57 @@ static int lpuart_poll_get_char(struct uart_port *port)
 	return readb(port->membase + UARTDR);
 }
 
+static int lpuart32_poll_init(struct uart_port *port)
+{
+	unsigned long flags;
+	struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
+	u32 temp;
+
+	sport->port.fifosize = 0;
+
+	spin_lock_irqsave(&sport->port.lock, flags);
+
+	/* Disable Rx & Tx */
+	writel(0, sport->port.membase + UARTCTRL);
+
+	temp = readl(sport->port.membase + UARTFIFO);
+
+	/* Enable Rx and Tx FIFO */
+	writel(temp | UARTFIFO_RXFE | UARTFIFO_TXFE,
+		   sport->port.membase + UARTFIFO);
+
+	/* flush Tx and Rx FIFO */
+	writel(UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH,
+			sport->port.membase + UARTFIFO);
+
+	/* explicitly clear RDRF */
+	if (readl(sport->port.membase + UARTSTAT) & UARTSTAT_RDRF) {
+		readl(sport->port.membase + UARTDATA);
+		writel(UARTFIFO_RXUF, sport->port.membase + UARTFIFO);
+	}
+
+	/* Enable Rx and Tx */
+	writel(UARTCTRL_RE | UARTCTRL_TE, sport->port.membase + UARTCTRL);
+	spin_unlock_irqrestore(&sport->port.lock, flags);
+
+	return 0;
+}
+
+static void lpuart32_poll_put_char(struct uart_port *port, unsigned char c)
+{
+	while (!(readl(port->membase + UARTSTAT) & UARTSTAT_TDRE))
+		barrier();
+
+	writel(c, port->membase + UARTDATA);
+}
+
+static int lpuart32_poll_get_char(struct uart_port *port)
+{
+	if (!(readl(port->membase + UARTSTAT) & UARTSTAT_RDRF))
+		return NO_POLL_CHAR;
+
+	return readl(port->membase + UARTDATA);
+}
 #endif
 
 static inline void lpuart_transmit_buffer(struct lpuart_port *sport)
@@ -1025,6 +1076,11 @@ static int lpuart_config_rs485(struct uart_port *port,
 		~(UARTMODEM_TXRTSPOL | UARTMODEM_TXRTSE);
 	writeb(modem, sport->port.membase + UARTMODEM);
 
+	/* clear unsupported configurations */
+	rs485->delay_rts_before_send = 0;
+	rs485->delay_rts_after_send = 0;
+	rs485->flags &= ~SER_RS485_RX_DURING_TX;
+
 	if (rs485->flags & SER_RS485_ENABLED) {
 		/* Enable auto RS-485 RTS mode */
 		modem |= UARTMODEM_TXRTSE;
@@ -1782,6 +1838,11 @@ static const struct uart_ops lpuart32_pops = {
 	.config_port	= lpuart_config_port,
 	.verify_port	= lpuart_verify_port,
 	.flush_buffer	= lpuart_flush_buffer,
+#if defined(CONFIG_CONSOLE_POLL)
+	.poll_init	= lpuart32_poll_init,
+	.poll_get_char	= lpuart32_poll_get_char,
+	.poll_put_char	= lpuart32_poll_put_char,
+#endif
 };
 
 static struct lpuart_port *lpuart_ports[UART_NR];
@@ -2203,6 +2264,7 @@ static int lpuart_suspend(struct device *dev)
 {
 	struct lpuart_port *sport = dev_get_drvdata(dev);
 	unsigned long temp;
+	bool irq_wake;
 
 	if (lpuart_is_32(sport)) {
 		/* disable Rx/Tx and interrupts */
@@ -2218,6 +2280,9 @@ static int lpuart_suspend(struct device *dev)
 
 	uart_suspend_port(&lpuart_reg, &sport->port);
 
+	/* uart_suspend_port() might set wakeup flag */
+	irq_wake = irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq));
+
 	if (sport->lpuart_dma_rx_use) {
 		/*
 		 * EDMA driver during suspend will forcefully release any
@@ -2226,7 +2291,7 @@ static int lpuart_suspend(struct device *dev)
 		 * cannot resume as as expected, hence gracefully release the
 		 * Rx DMA path before suspend and start Rx DMA path on resume.
 		 */
-		if (sport->port.irq_wake) {
+		if (irq_wake) {
 			del_timer_sync(&sport->lpuart_timer);
 			lpuart_dma_rx_free(&sport->port);
 		}
@@ -2241,7 +2306,7 @@ static int lpuart_suspend(struct device *dev)
 		dmaengine_terminate_all(sport->dma_tx_chan);
 	}
 
-	if (sport->port.suspended && !sport->port.irq_wake)
+	if (sport->port.suspended && !irq_wake)
 		clk_disable_unprepare(sport->clk);
 
 	return 0;
@@ -2250,9 +2315,10 @@ static int lpuart_suspend(struct device *dev)
 static int lpuart_resume(struct device *dev)
 {
 	struct lpuart_port *sport = dev_get_drvdata(dev);
+	bool irq_wake = irqd_is_wakeup_set(irq_get_irq_data(sport->port.irq));
 	unsigned long temp;
 
-	if (sport->port.suspended && !sport->port.irq_wake)
+	if (sport->port.suspended && !irq_wake)
 		clk_prepare_enable(sport->clk);
 
 	if (lpuart_is_32(sport)) {
@@ -2269,7 +2335,7 @@ static int lpuart_resume(struct device *dev)
 	}
 
 	if (sport->lpuart_dma_rx_use) {
-		if (sport->port.irq_wake) {
+		if (irq_wake) {
 			if (!lpuart_start_rx_dma(sport))
 				rx_dma_timer_init(sport);
 			else

drivers/tty/serial/imx.c

@@ -226,7 +226,6 @@ struct imx_port {
 	dma_cookie_t		rx_cookie;
 	unsigned int		tx_bytes;
 	unsigned int		dma_tx_nents;
-	wait_queue_head_t	dma_wait;
 	unsigned int            saved_reg[10];
 	bool			context_saved;
 };
@@ -458,7 +457,10 @@ static inline void imx_transmit_buffer(struct imx_port *sport)
 		}
 	}
 
-	while (!uart_circ_empty(xmit) && !sport->dma_is_txing &&
+	if (sport->dma_is_txing)
+		return;
+
+	while (!uart_circ_empty(xmit) &&
 	       !(readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)) {
 		/* send xmit->buf[xmit->tail]
 		 * out the port here */
@@ -498,20 +500,12 @@ static void dma_tx_callback(void *data)
 
 	sport->dma_is_txing = 0;
 
-	spin_unlock_irqrestore(&sport->port.lock, flags);
-
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(&sport->port);
 
-	if (waitqueue_active(&sport->dma_wait)) {
-		wake_up(&sport->dma_wait);
-		dev_dbg(sport->port.dev, "exit in %s.\n", __func__);
-		return;
-	}
-
-	spin_lock_irqsave(&sport->port.lock, flags);
 	if (!uart_circ_empty(xmit) && !uart_tx_stopped(&sport->port))
 		imx_dma_tx(sport);
+
 	spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
@@ -1208,8 +1202,6 @@ static void imx_enable_dma(struct imx_port *sport)
 {
 	unsigned long temp;
 
-	init_waitqueue_head(&sport->dma_wait);
-
 	/* set UCR1 */
 	temp = readl(sport->port.membase + UCR1);
 	temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN;
@@ -2332,6 +2324,7 @@ static int imx_serial_port_suspend(struct device *dev)
 	serial_imx_enable_wakeup(sport, true);
 
 	uart_suspend_port(&imx_reg, &sport->port);
+	disable_irq(sport->port.irq);
 
 	/* Needed to enable clock in suspend_noirq */
 	return clk_prepare(sport->clk_ipg);
@@ -2346,6 +2339,7 @@ static int imx_serial_port_resume(struct device *dev)
 	serial_imx_enable_wakeup(sport, false);
 
 	uart_resume_port(&imx_reg, &sport->port);
+	enable_irq(sport->port.irq);
 
 	clk_unprepare(sport->clk_ipg);
 

drivers/tty/serial/jsm/jsm_driver.c

@@ -304,7 +304,7 @@ static void jsm_remove_one(struct pci_dev *pdev)
 	kfree(brd);
 }
 
-static struct pci_device_id jsm_pci_tbl[] = {
+static const struct pci_device_id jsm_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9), 0, 0, 0 },
 	{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2DB9PRI), 0, 0, 1 },
 	{ PCI_DEVICE(PCI_VENDOR_ID_DIGI, PCI_DEVICE_ID_NEO_2RJ45), 0, 0, 2 },

drivers/tty/serial/m32r_sio.c

@@ -854,7 +854,7 @@ m32r_sio_verify_port(struct uart_port *port, struct serial_struct *ser)
 	return 0;
 }
 
-static struct uart_ops m32r_sio_pops = {
+static const struct uart_ops m32r_sio_pops = {
 	.tx_empty	= m32r_sio_tx_empty,
 	.set_mctrl	= m32r_sio_set_mctrl,
 	.get_mctrl	= m32r_sio_get_mctrl,

drivers/tty/serial/meson_uart.c

@@ -424,7 +424,7 @@ static void meson_uart_config_port(struct uart_port *port, int flags)
 	}
 }
 
-static struct uart_ops meson_uart_ops = {
+static const struct uart_ops meson_uart_ops = {
 	.set_mctrl      = meson_uart_set_mctrl,
 	.get_mctrl      = meson_uart_get_mctrl,
 	.tx_empty	= meson_uart_tx_empty,

drivers/tty/serial/mpc52xx_uart.c

@@ -1347,7 +1347,7 @@ mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
 }
 
 
-static struct uart_ops mpc52xx_uart_ops = {
+static const struct uart_ops mpc52xx_uart_ops = {
 	.tx_empty	= mpc52xx_uart_tx_empty,
 	.set_mctrl	= mpc52xx_uart_set_mctrl,
 	.get_mctrl	= mpc52xx_uart_get_mctrl,
@@ -1634,8 +1634,8 @@ mpc52xx_console_setup(struct console *co, char *options)
 		return -EINVAL;
 	}
 
-	pr_debug("Console on ttyPSC%x is %s\n",
+	pr_debug("Console on ttyPSC%x is %pOF\n",
-		 co->index, mpc52xx_uart_nodes[co->index]->full_name);
+		 co->index, mpc52xx_uart_nodes[co->index]);
 
 	/* Fetch register locations */
 	ret = of_address_to_resource(np, 0, &res);
@@ -1755,8 +1755,8 @@ static int mpc52xx_uart_of_probe(struct platform_device *op)
 			break;
 	if (idx >= MPC52xx_PSC_MAXNUM)
 		return -EINVAL;
-	pr_debug("Found %s assigned to ttyPSC%x\n",
+	pr_debug("Found %pOF assigned to ttyPSC%x\n",
-		 mpc52xx_uart_nodes[idx]->full_name, idx);
+		 mpc52xx_uart_nodes[idx], idx);
 
 	/* set the uart clock to the input clock of the psc, the different
 	 * prescalers are taken into account in the set_baudrate() methods
@@ -1881,8 +1881,8 @@ mpc52xx_uart_of_enumerate(void)
 
 	for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
 		if (mpc52xx_uart_nodes[i])
-			pr_debug("%s assigned to ttyPSC%x\n",
+			pr_debug("%pOF assigned to ttyPSC%x\n",
-				 mpc52xx_uart_nodes[i]->full_name, i);
+				 mpc52xx_uart_nodes[i], i);
 	}
 }
 

drivers/tty/serial/msm_serial.c

@@ -1175,11 +1175,6 @@ static int msm_startup(struct uart_port *port)
 	snprintf(msm_port->name, sizeof(msm_port->name),
 		 "msm_serial%d", port->line);
 
-	ret = request_irq(port->irq, msm_uart_irq, IRQF_TRIGGER_HIGH,
-			  msm_port->name, port);
-	if (unlikely(ret))
-		return ret;
-
 	msm_init_clock(port);
 
 	if (likely(port->fifosize > 12))
@@ -1206,7 +1201,21 @@ static int msm_startup(struct uart_port *port)
 		msm_request_rx_dma(msm_port, msm_port->uart.mapbase);
 	}
 
+	ret = request_irq(port->irq, msm_uart_irq, IRQF_TRIGGER_HIGH,
+			  msm_port->name, port);
+	if (unlikely(ret))
+		goto err_irq;
+
 	return 0;
+
+err_irq:
+	if (msm_port->is_uartdm)
+		msm_release_dma(msm_port);
+
+	clk_disable_unprepare(msm_port->pclk);
+	clk_disable_unprepare(msm_port->clk);
+
+	return ret;
 }
 
 static void msm_shutdown(struct uart_port *port)

drivers/tty/serial/mux.c

@@ -427,7 +427,7 @@ static struct console mux_console = {
 #define MUX_CONSOLE	NULL
 #endif
 
-static struct uart_ops mux_pops = {
+static const struct uart_ops mux_pops = {
 	.tx_empty =		mux_tx_empty,
 	.set_mctrl =		mux_set_mctrl,
 	.get_mctrl =		mux_get_mctrl,

drivers/tty/serial/omap-serial.c

@@ -1235,21 +1235,20 @@ static int serial_omap_poll_get_char(struct uart_port *port)
 #ifdef CONFIG_SERIAL_OMAP_CONSOLE
 
 #ifdef CONFIG_SERIAL_EARLYCON
-static unsigned int __init omap_serial_early_in(struct uart_port *port,
+static unsigned int omap_serial_early_in(struct uart_port *port, int offset)
-						int offset)
 {
 	offset <<= port->regshift;
 	return readw(port->membase + offset);
 }
 
-static void __init omap_serial_early_out(struct uart_port *port, int offset,
+static void omap_serial_early_out(struct uart_port *port, int offset,
-					 int value)
+				  int value)
 {
 	offset <<= port->regshift;
 	writew(value, port->membase + offset);
 }
 
-static void __init omap_serial_early_putc(struct uart_port *port, int c)
+static void omap_serial_early_putc(struct uart_port *port, int c)
 {
 	unsigned int status;
 
@@ -1262,8 +1261,8 @@ static void __init omap_serial_early_putc(struct uart_port *port, int c)
 	omap_serial_early_out(port, UART_TX, c);
 }
 
-static void __init early_omap_serial_write(struct console *console,
+static void early_omap_serial_write(struct console *console, const char *s,
-					   const char *s, unsigned int count)
+				    unsigned int count)
 {
 	struct earlycon_device *device = console->data;
 	struct uart_port *port = &device->port;

drivers/tty/serial/owl-uart.c

@@ -20,6 +20,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/clk.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/io.h>
@@ -28,22 +29,66 @@
 #include <linux/platform_device.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+#define OWL_UART_PORT_NUM 7
+#define OWL_UART_DEV_NAME "ttyOWL"
 
 #define OWL_UART_CTL	0x000
+#define OWL_UART_RXDAT	0x004
 #define OWL_UART_TXDAT	0x008
 #define OWL_UART_STAT	0x00c
 
+#define OWL_UART_CTL_DWLS_MASK		GENMASK(1, 0)
+#define OWL_UART_CTL_DWLS_5BITS		(0x0 << 0)
+#define OWL_UART_CTL_DWLS_6BITS		(0x1 << 0)
+#define OWL_UART_CTL_DWLS_7BITS		(0x2 << 0)
+#define OWL_UART_CTL_DWLS_8BITS		(0x3 << 0)
+#define OWL_UART_CTL_STPS_2BITS		BIT(2)
+#define OWL_UART_CTL_PRS_MASK		GENMASK(6, 4)
+#define OWL_UART_CTL_PRS_NONE		(0x0 << 4)
+#define OWL_UART_CTL_PRS_ODD		(0x4 << 4)
+#define OWL_UART_CTL_PRS_MARK		(0x5 << 4)
+#define OWL_UART_CTL_PRS_EVEN		(0x6 << 4)
+#define OWL_UART_CTL_PRS_SPACE		(0x7 << 4)
+#define OWL_UART_CTL_AFE		BIT(12)
 #define OWL_UART_CTL_TRFS_TX		BIT(14)
 #define OWL_UART_CTL_EN			BIT(15)
+#define OWL_UART_CTL_RXDE		BIT(16)
+#define OWL_UART_CTL_TXDE		BIT(17)
 #define OWL_UART_CTL_RXIE		BIT(18)
 #define OWL_UART_CTL_TXIE		BIT(19)
+#define OWL_UART_CTL_LBEN		BIT(20)
 
 #define OWL_UART_STAT_RIP		BIT(0)
 #define OWL_UART_STAT_TIP		BIT(1)
+#define OWL_UART_STAT_RXER		BIT(2)
+#define OWL_UART_STAT_TFER		BIT(3)
+#define OWL_UART_STAT_RXST		BIT(4)
+#define OWL_UART_STAT_RFEM		BIT(5)
 #define OWL_UART_STAT_TFFU		BIT(6)
-#define OWL_UART_STAT_TRFL_MASK		(0x1f << 11)
+#define OWL_UART_STAT_CTSS		BIT(7)
+#define OWL_UART_STAT_RTSS		BIT(8)
+#define OWL_UART_STAT_TFES		BIT(10)
+#define OWL_UART_STAT_TRFL_MASK		GENMASK(16, 11)
 #define OWL_UART_STAT_UTBB		BIT(17)
 
+static struct uart_driver owl_uart_driver;
+
+struct owl_uart_info {
+	unsigned int tx_fifosize;
+};
+
+struct owl_uart_port {
+	struct uart_port port;
+	struct clk *clk;
+};
+
+#define to_owl_uart_port(prt) container_of(prt, struct owl_uart_port, prt)
+
+static struct owl_uart_port *owl_uart_ports[OWL_UART_PORT_NUM];
+
 static inline void owl_uart_write(struct uart_port *port, u32 val, unsigned int off)
 {
 	writel(val, port->membase + off);
@@ -54,6 +99,397 @@ static inline u32 owl_uart_read(struct uart_port *port, unsigned int off)
 	return readl(port->membase + off);
 }
 
+static void owl_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+	u32 ctl;
+
+	ctl = owl_uart_read(port, OWL_UART_CTL);
+
+	if (mctrl & TIOCM_LOOP)
+		ctl |= OWL_UART_CTL_LBEN;
+	else
+		ctl &= ~OWL_UART_CTL_LBEN;
+
+	owl_uart_write(port, ctl, OWL_UART_CTL);
+}
+
+static unsigned int owl_uart_get_mctrl(struct uart_port *port)
+{
+	unsigned int mctrl = TIOCM_CAR | TIOCM_DSR;
+	u32 stat, ctl;
+
+	ctl = owl_uart_read(port, OWL_UART_CTL);
+	stat = owl_uart_read(port, OWL_UART_STAT);
+	if (stat & OWL_UART_STAT_RTSS)
+		mctrl |= TIOCM_RTS;
+	if ((stat & OWL_UART_STAT_CTSS) || !(ctl & OWL_UART_CTL_AFE))
+		mctrl |= TIOCM_CTS;
+	return mctrl;
+}
+
+static unsigned int owl_uart_tx_empty(struct uart_port *port)
+{
+	unsigned long flags;
+	u32 val;
+	unsigned int ret;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	ret = (val & OWL_UART_STAT_TFES) ? TIOCSER_TEMT : 0;
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return ret;
+}
+
+static void owl_uart_stop_rx(struct uart_port *port)
+{
+	u32 val;
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~(OWL_UART_CTL_RXIE | OWL_UART_CTL_RXDE);
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_RIP;
+	owl_uart_write(port, val, OWL_UART_STAT);
+}
+
+static void owl_uart_stop_tx(struct uart_port *port)
+{
+	u32 val;
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~(OWL_UART_CTL_TXIE | OWL_UART_CTL_TXDE);
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_TIP;
+	owl_uart_write(port, val, OWL_UART_STAT);
+}
+
+static void owl_uart_start_tx(struct uart_port *port)
+{
+	u32 val;
+
+	if (uart_tx_stopped(port)) {
+		owl_uart_stop_tx(port);
+		return;
+	}
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_TIP;
+	owl_uart_write(port, val, OWL_UART_STAT);
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val |= OWL_UART_CTL_TXIE;
+	owl_uart_write(port, val, OWL_UART_CTL);
+}
+
+static void owl_uart_send_chars(struct uart_port *port)
+{
+	struct circ_buf *xmit = &port->state->xmit;
+	unsigned int ch;
+
+	if (uart_tx_stopped(port))
+		return;
+
+	if (port->x_char) {
+		while (!(owl_uart_read(port, OWL_UART_STAT) & OWL_UART_STAT_TFFU))
+			cpu_relax();
+		owl_uart_write(port, port->x_char, OWL_UART_TXDAT);
+		port->icount.tx++;
+		port->x_char = 0;
+	}
+
+	while (!(owl_uart_read(port, OWL_UART_STAT) & OWL_UART_STAT_TFFU)) {
+		if (uart_circ_empty(xmit))
+			break;
+
+		ch = xmit->buf[xmit->tail];
+		owl_uart_write(port, ch, OWL_UART_TXDAT);
+		xmit->tail = (xmit->tail + 1) & (SERIAL_XMIT_SIZE - 1);
+		port->icount.tx++;
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(port);
+
+	if (uart_circ_empty(xmit))
+		owl_uart_stop_tx(port);
+}
+
+static void owl_uart_receive_chars(struct uart_port *port)
+{
+	u32 stat, val;
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~OWL_UART_CTL_TRFS_TX;
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	stat = owl_uart_read(port, OWL_UART_STAT);
+	while (!(stat & OWL_UART_STAT_RFEM)) {
+		char flag = TTY_NORMAL;
+
+		if (stat & OWL_UART_STAT_RXER)
+			port->icount.overrun++;
+
+		if (stat & OWL_UART_STAT_RXST) {
+			/* We are not able to distinguish the error type. */
+			port->icount.brk++;
+			port->icount.frame++;
+
+			stat &= port->read_status_mask;
+			if (stat & OWL_UART_STAT_RXST)
+				flag = TTY_PARITY;
+		} else
+			port->icount.rx++;
+
+		val = owl_uart_read(port, OWL_UART_RXDAT);
+		val &= 0xff;
+
+		if ((stat & port->ignore_status_mask) == 0)
+			tty_insert_flip_char(&port->state->port, val, flag);
+
+		stat = owl_uart_read(port, OWL_UART_STAT);
+	}
+
+	spin_unlock(&port->lock);
+	tty_flip_buffer_push(&port->state->port);
+	spin_lock(&port->lock);
+}
+
+static irqreturn_t owl_uart_irq(int irq, void *dev_id)
+{
+	struct uart_port *port = dev_id;
+	unsigned long flags;
+	u32 stat;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	stat = owl_uart_read(port, OWL_UART_STAT);
+
+	if (stat & OWL_UART_STAT_RIP)
+		owl_uart_receive_chars(port);
+
+	if (stat & OWL_UART_STAT_TIP)
+		owl_uart_send_chars(port);
+
+	stat = owl_uart_read(port, OWL_UART_STAT);
+	stat |= OWL_UART_STAT_RIP | OWL_UART_STAT_TIP;
+	owl_uart_write(port, stat, OWL_UART_STAT);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+static void owl_uart_shutdown(struct uart_port *port)
+{
+	u32 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val &= ~(OWL_UART_CTL_TXIE | OWL_UART_CTL_RXIE
+		| OWL_UART_CTL_TXDE | OWL_UART_CTL_RXDE | OWL_UART_CTL_EN);
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	free_irq(port->irq, port);
+}
+
+static int owl_uart_startup(struct uart_port *port)
+{
+	u32 val;
+	unsigned long flags;
+	int ret;
+
+	ret = request_irq(port->irq, owl_uart_irq, IRQF_TRIGGER_HIGH,
+			"owl-uart", port);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	val = owl_uart_read(port, OWL_UART_STAT);
+	val |= OWL_UART_STAT_RIP | OWL_UART_STAT_TIP
+		| OWL_UART_STAT_RXER | OWL_UART_STAT_TFER | OWL_UART_STAT_RXST;
+	owl_uart_write(port, val, OWL_UART_STAT);
+
+	val = owl_uart_read(port, OWL_UART_CTL);
+	val |= OWL_UART_CTL_RXIE | OWL_UART_CTL_TXIE;
+	val |= OWL_UART_CTL_EN;
+	owl_uart_write(port, val, OWL_UART_CTL);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	return 0;
+}
+
+static void owl_uart_change_baudrate(struct owl_uart_port *owl_port,
+				     unsigned long baud)
+{
+	clk_set_rate(owl_port->clk, baud * 8);
+}
+
+static void owl_uart_set_termios(struct uart_port *port,
+				 struct ktermios *termios,
+				 struct ktermios *old)
+{
+	struct owl_uart_port *owl_port = to_owl_uart_port(port);
+	unsigned int baud;
+	u32 ctl;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	ctl = owl_uart_read(port, OWL_UART_CTL);
+
+	ctl &= ~OWL_UART_CTL_DWLS_MASK;
+	switch (termios->c_cflag & CSIZE) {
+	case CS5:
+		ctl |= OWL_UART_CTL_DWLS_5BITS;
+		break;
+	case CS6:
+		ctl |= OWL_UART_CTL_DWLS_6BITS;
+		break;
+	case CS7:
+		ctl |= OWL_UART_CTL_DWLS_7BITS;
+		break;
+	case CS8:
+	default:
+		ctl |= OWL_UART_CTL_DWLS_8BITS;
+		break;
+	}
+
+	if (termios->c_cflag & CSTOPB)
+		ctl |= OWL_UART_CTL_STPS_2BITS;
+	else
+		ctl &= ~OWL_UART_CTL_STPS_2BITS;
+
+	ctl &= ~OWL_UART_CTL_PRS_MASK;
+	if (termios->c_cflag & PARENB) {
+		if (termios->c_cflag & CMSPAR) {
+			if (termios->c_cflag & PARODD)
+				ctl |= OWL_UART_CTL_PRS_MARK;
+			else
+				ctl |= OWL_UART_CTL_PRS_SPACE;
+		} else if (termios->c_cflag & PARODD)
+			ctl |= OWL_UART_CTL_PRS_ODD;
+		else
+			ctl |= OWL_UART_CTL_PRS_EVEN;
+	} else
+		ctl |= OWL_UART_CTL_PRS_NONE;
+
+	if (termios->c_cflag & CRTSCTS)
+		ctl |= OWL_UART_CTL_AFE;
+	else
+		ctl &= ~OWL_UART_CTL_AFE;
+
+	owl_uart_write(port, ctl, OWL_UART_CTL);
+
+	baud = uart_get_baud_rate(port, termios, old, 9600, 3200000);
+	owl_uart_change_baudrate(owl_port, baud);
+
+	/* Don't rewrite B0 */
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
+
+	port->read_status_mask |= OWL_UART_STAT_RXER;
+	if (termios->c_iflag & INPCK)
+		port->read_status_mask |= OWL_UART_STAT_RXST;
+
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void owl_uart_release_port(struct uart_port *port)
+{
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return;
+
+	if (port->flags & UPF_IOREMAP) {
+		devm_release_mem_region(port->dev, port->mapbase,
+			resource_size(res));
+		devm_iounmap(port->dev, port->membase);
+		port->membase = NULL;
+	}
+}
+
+static int owl_uart_request_port(struct uart_port *port)
+{
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENXIO;
+
+	if (!devm_request_mem_region(port->dev, port->mapbase,
+			resource_size(res), dev_name(port->dev)))
+		return -EBUSY;
+
+	if (port->flags & UPF_IOREMAP) {
+		port->membase = devm_ioremap_nocache(port->dev, port->mapbase,
+				resource_size(res));
+		if (!port->membase)
+			return -EBUSY;
+	}
+
+	return 0;
+}
+
+static const char *owl_uart_type(struct uart_port *port)
+{
+	return (port->type == PORT_OWL) ? "owl-uart" : NULL;
+}
+
+static int owl_uart_verify_port(struct uart_port *port,
+				struct serial_struct *ser)
+{
+	if (port->type != PORT_OWL)
+		return -EINVAL;
+
+	if (port->irq != ser->irq)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void owl_uart_config_port(struct uart_port *port, int flags)
+{
+	if (flags & UART_CONFIG_TYPE) {
+		port->type = PORT_OWL;
+		owl_uart_request_port(port);
+	}
+}
+
+static const struct uart_ops owl_uart_ops = {
+	.set_mctrl = owl_uart_set_mctrl,
+	.get_mctrl = owl_uart_get_mctrl,
+	.tx_empty = owl_uart_tx_empty,
+	.start_tx = owl_uart_start_tx,
+	.stop_rx = owl_uart_stop_rx,
+	.stop_tx = owl_uart_stop_tx,
+	.startup = owl_uart_startup,
+	.shutdown = owl_uart_shutdown,
+	.set_termios = owl_uart_set_termios,
+	.type = owl_uart_type,
+	.config_port = owl_uart_config_port,
+	.request_port = owl_uart_request_port,
+	.release_port = owl_uart_release_port,
+	.verify_port = owl_uart_verify_port,
+};
+
 #ifdef CONFIG_SERIAL_OWL_CONSOLE
 
 static void owl_console_putchar(struct uart_port *port, int ch)
@@ -110,6 +546,57 @@ static void owl_uart_port_write(struct uart_port *port, const char *s,
 	local_irq_restore(flags);
 }
 
+static void owl_uart_console_write(struct console *co, const char *s,
+				   u_int count)
+{
+	struct owl_uart_port *owl_port;
+
+	owl_port = owl_uart_ports[co->index];
+	if (!owl_port)
+		return;
+
+	owl_uart_port_write(&owl_port->port, s, count);
+}
+
+static int owl_uart_console_setup(struct console *co, char *options)
+{
+	struct owl_uart_port *owl_port;
+	int baud = 115200;
+	int bits = 8;
+	int parity = 'n';
+	int flow = 'n';
+
+	if (co->index < 0 || co->index >= OWL_UART_PORT_NUM)
+		return -EINVAL;
+
+	owl_port = owl_uart_ports[co->index];
+	if (!owl_port || !owl_port->port.membase)
+		return -ENODEV;
+
+	if (options)
+		uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+	return uart_set_options(&owl_port->port, co, baud, parity, bits, flow);
+}
+
+static struct console owl_uart_console = {
+	.name = OWL_UART_DEV_NAME,
+	.write = owl_uart_console_write,
+	.device = uart_console_device,
+	.setup = owl_uart_console_setup,
+	.flags = CON_PRINTBUFFER,
+	.index = -1,
+	.data = &owl_uart_driver,
+};
+
+static int __init owl_uart_console_init(void)
+{
+	register_console(&owl_uart_console);
+
+	return 0;
+}
+console_initcall(owl_uart_console_init);
+
 static void owl_uart_early_console_write(struct console *co,
 					 const char *s,
 					 u_int count)
@@ -132,4 +619,148 @@ owl_uart_early_console_setup(struct earlycon_device *device, const char *opt)
 OF_EARLYCON_DECLARE(owl, "actions,owl-uart",
 		    owl_uart_early_console_setup);
 
-#endif /* CONFIG_SERIAL_OWL_CONSOLE */
+#define OWL_UART_CONSOLE (&owl_uart_console)
+#else
+#define OWL_UART_CONSOLE NULL
+#endif
+
+static struct uart_driver owl_uart_driver = {
+	.owner = THIS_MODULE,
+	.driver_name = "owl-uart",
+	.dev_name = OWL_UART_DEV_NAME,
+	.nr = OWL_UART_PORT_NUM,
+	.cons = OWL_UART_CONSOLE,
+};
+
+static const struct owl_uart_info owl_s500_info = {
+	.tx_fifosize = 16,
+};
+
+static const struct owl_uart_info owl_s900_info = {
+	.tx_fifosize = 32,
+};
+
+static const struct of_device_id owl_uart_dt_matches[] = {
+	{ .compatible = "actions,s500-uart", .data = &owl_s500_info },
+	{ .compatible = "actions,s900-uart", .data = &owl_s900_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, owl_uart_dt_matches);
+
+static int owl_uart_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	const struct owl_uart_info *info = NULL;
+	struct resource *res_mem;
+	struct owl_uart_port *owl_port;
+	int ret, irq;
+
+	if (pdev->dev.of_node) {
+		pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");
+		match = of_match_node(owl_uart_dt_matches, pdev->dev.of_node);
+		if (match)
+			info = match->data;
+	}
+
+	if (pdev->id < 0 || pdev->id >= OWL_UART_PORT_NUM) {
+		dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
+		return -EINVAL;
+	}
+
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res_mem) {
+		dev_err(&pdev->dev, "could not get mem\n");
+		return -ENODEV;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "could not get irq\n");
+		return irq;
+	}
+
+	if (owl_uart_ports[pdev->id]) {
+		dev_err(&pdev->dev, "port %d already allocated\n", pdev->id);
+		return -EBUSY;
+	}
+
+	owl_port = devm_kzalloc(&pdev->dev, sizeof(*owl_port), GFP_KERNEL);
+	if (!owl_port)
+		return -ENOMEM;
+
+	owl_port->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(owl_port->clk)) {
+		dev_err(&pdev->dev, "could not get clk\n");
+		return PTR_ERR(owl_port->clk);
+	}
+
+	owl_port->port.dev = &pdev->dev;
+	owl_port->port.line = pdev->id;
+	owl_port->port.type = PORT_OWL;
+	owl_port->port.iotype = UPIO_MEM;
+	owl_port->port.mapbase = res_mem->start;
+	owl_port->port.irq = irq;
+	owl_port->port.uartclk = clk_get_rate(owl_port->clk);
+	if (owl_port->port.uartclk == 0) {
+		dev_err(&pdev->dev, "clock rate is zero\n");
+		return -EINVAL;
+	}
+	owl_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_LOW_LATENCY;
+	owl_port->port.x_char = 0;
+	owl_port->port.fifosize = (info) ? info->tx_fifosize : 16;
+	owl_port->port.ops = &owl_uart_ops;
+
+	owl_uart_ports[pdev->id] = owl_port;
+	platform_set_drvdata(pdev, owl_port);
+
+	ret = uart_add_one_port(&owl_uart_driver, &owl_port->port);
+	if (ret)
+		owl_uart_ports[pdev->id] = NULL;
+
+	return ret;
+}
+
+static int owl_uart_remove(struct platform_device *pdev)
+{
+	struct owl_uart_port *owl_port = platform_get_drvdata(pdev);
+
+	uart_remove_one_port(&owl_uart_driver, &owl_port->port);
+	owl_uart_ports[pdev->id] = NULL;
+
+	return 0;
+}
+
+static struct platform_driver owl_uart_platform_driver = {
+	.probe = owl_uart_probe,
+	.remove = owl_uart_remove,
+	.driver = {
+		.name = "owl-uart",
+		.of_match_table = owl_uart_dt_matches,
+	},
+};
+
+static int __init owl_uart_init(void)
+{
+	int ret;
+
+	ret = uart_register_driver(&owl_uart_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&owl_uart_platform_driver);
+	if (ret)
+		uart_unregister_driver(&owl_uart_driver);
+
+	return ret;
+}
+
+static void __init owl_uart_exit(void)
+{
+	platform_driver_unregister(&owl_uart_platform_driver);
+	uart_unregister_driver(&owl_uart_driver);
+}
+
+module_init(owl_uart_init);
+module_exit(owl_uart_exit);
+
+MODULE_LICENSE("GPL");

drivers/tty/serial/pch_uart.c

@@ -46,11 +46,6 @@ enum {
 	PCH_UART_HANDLED_LS_INT_SHIFT,
 };
 
-enum {
-	PCH_UART_8LINE,
-	PCH_UART_2LINE,
-};
-
 #define PCH_UART_DRIVER_DEVICE "ttyPCH"
 
 /* Set the max number of UART port
@@ -267,7 +262,7 @@ struct eg20t_port {
 
 /**
  * struct pch_uart_driver_data - private data structure for UART-DMA
- * @port_type:			The number of DMA channel
+ * @port_type:			The type of UART port
  * @line_no:			UART port line number (0, 1, 2...)
  */
 struct pch_uart_driver_data {
@@ -290,17 +285,17 @@ enum pch_uart_num_t {
 };
 
 static struct pch_uart_driver_data drv_dat[] = {
-	[pch_et20t_uart0] = {PCH_UART_8LINE, 0},
+	[pch_et20t_uart0] = {PORT_PCH_8LINE, 0},
-	[pch_et20t_uart1] = {PCH_UART_2LINE, 1},
+	[pch_et20t_uart1] = {PORT_PCH_2LINE, 1},
-	[pch_et20t_uart2] = {PCH_UART_2LINE, 2},
+	[pch_et20t_uart2] = {PORT_PCH_2LINE, 2},
-	[pch_et20t_uart3] = {PCH_UART_2LINE, 3},
+	[pch_et20t_uart3] = {PORT_PCH_2LINE, 3},
-	[pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
+	[pch_ml7213_uart0] = {PORT_PCH_8LINE, 0},
-	[pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
+	[pch_ml7213_uart1] = {PORT_PCH_2LINE, 1},
-	[pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
+	[pch_ml7213_uart2] = {PORT_PCH_2LINE, 2},
-	[pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
+	[pch_ml7223_uart0] = {PORT_PCH_8LINE, 0},
-	[pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
+	[pch_ml7223_uart1] = {PORT_PCH_2LINE, 1},
-	[pch_ml7831_uart0] = {PCH_UART_8LINE, 0},
+	[pch_ml7831_uart0] = {PORT_PCH_8LINE, 0},
-	[pch_ml7831_uart1] = {PCH_UART_2LINE, 1},
+	[pch_ml7831_uart1] = {PORT_PCH_2LINE, 1},
 };
 
 #ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
@@ -1777,10 +1772,10 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 		goto init_port_free_txbuf;
 
 	switch (port_type) {
-	case PORT_UNKNOWN:
+	case PORT_PCH_8LINE:
 		fifosize = 256; /* EG20T/ML7213: UART0 */
 		break;
-	case PORT_8250:
+	case PORT_PCH_2LINE:
 		fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
 		break;
 	default:
@@ -1804,7 +1799,7 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 
 	priv->fifo_size = fifosize;
 	priv->uartclk = pch_uart_get_uartclk();
-	priv->port_type = PORT_MAX_8250 + port_type + 1;
+	priv->port_type = port_type;
 	priv->port.dev = &pdev->dev;
 	priv->port.iobase = iobase;
 	priv->port.membase = NULL;
@@ -1862,8 +1857,7 @@ static void pch_uart_exit_port(struct eg20t_port *priv)
 {
 
 #ifdef CONFIG_DEBUG_FS
-	if (priv->debugfs)
+	debugfs_remove(priv->debugfs);
-		debugfs_remove(priv->debugfs);
 #endif
 	uart_remove_one_port(&pch_uart_driver, &priv->port);
 	free_page((unsigned long)priv->rxbuf.buf);

drivers/tty/serial/pmac_zilog.c

@@ -1671,8 +1671,8 @@ static int __init pmz_probe(void)
 		if (!node_a && !node_b) {
 			of_node_put(node_a);
 			of_node_put(node_b);
-			printk(KERN_ERR "pmac_zilog: missing node %c for escc %s\n",
+			printk(KERN_ERR "pmac_zilog: missing node %c for escc %pOF\n",
-				(!node_a) ? 'a' : 'b', node_p->full_name);
+				(!node_a) ? 'a' : 'b', node_p);
 			continue;
 		}
 

drivers/tty/serial/serial-tegra.c

@@ -1310,7 +1310,7 @@ static int tegra_uart_probe(struct platform_device *pdev)
 		return PTR_ERR(tup->uart_clk);
 	}
 
-	tup->rst = devm_reset_control_get(&pdev->dev, "serial");
+	tup->rst = devm_reset_control_get_exclusive(&pdev->dev, "serial");
 	if (IS_ERR(tup->rst)) {
 		dev_err(&pdev->dev, "Couldn't get the reset\n");
 		return PTR_ERR(tup->rst);

drivers/tty/serial/serial_core.c

@@ -36,7 +36,7 @@
 #include <linux/delay.h>
 #include <linux/mutex.h>
 
-#include <asm/irq.h>
+#include <linux/irq.h>
 #include <linux/uaccess.h>
 
 /*
@@ -165,6 +165,27 @@ uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
 #define uart_set_mctrl(port, set)	uart_update_mctrl(port, set, 0)
 #define uart_clear_mctrl(port, clear)	uart_update_mctrl(port, 0, clear)
 
+static void uart_port_dtr_rts(struct uart_port *uport, int raise)
+{
+	int rs485_on = uport->rs485_config &&
+		(uport->rs485.flags & SER_RS485_ENABLED);
+	int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND);
+
+	if (raise) {
+		if (rs485_on && !RTS_after_send) {
+			uart_set_mctrl(uport, TIOCM_DTR);
+			uart_clear_mctrl(uport, TIOCM_RTS);
+		} else {
+			uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
+		}
+	} else {
+		unsigned int clear = TIOCM_DTR;
+
+		clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0;
+		uart_clear_mctrl(uport, clear);
+	}
+}
+
 /*
  * Startup the port.  This will be called once per open.  All calls
  * will be serialised by the per-port mutex.
@@ -214,7 +235,7 @@ static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
 		 * port is open and ready to respond.
 		 */
 		if (init_hw && C_BAUD(tty))
-			uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
+			uart_port_dtr_rts(uport, 1);
 	}
 
 	/*
@@ -272,7 +293,7 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 			uport->cons->cflag = tty->termios.c_cflag;
 
 		if (!tty || C_HUPCL(tty))
-			uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
+			uart_port_dtr_rts(uport, 0);
 
 		uart_port_shutdown(port);
 	}
@@ -744,7 +765,7 @@ static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo)
 	if (HIGH_BITS_OFFSET)
 		retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET;
 	retinfo->irq		    = uport->irq;
-	retinfo->flags	    = uport->flags;
+	retinfo->flags	    = (__force int)uport->flags;
 	retinfo->xmit_fifo_size  = uport->fifosize;
 	retinfo->baud_base	    = uport->uartclk / 16;
 	retinfo->close_delay	    = jiffies_to_msecs(port->close_delay) / 10;
@@ -818,7 +839,7 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
 		    new_info->type != uport->type);
 
 	old_flags = uport->flags;
-	new_flags = new_info->flags;
+	new_flags = (__force upf_t)new_info->flags;
 	old_custom_divisor = uport->custom_divisor;
 
 	if (!capable(CAP_SYS_ADMIN)) {
@@ -1658,7 +1679,7 @@ static int uart_carrier_raised(struct tty_port *port)
 	return 0;
 }
 
-static void uart_dtr_rts(struct tty_port *port, int onoff)
+static void uart_dtr_rts(struct tty_port *port, int raise)
 {
 	struct uart_state *state = container_of(port, struct uart_state, port);
 	struct uart_port *uport;
@@ -1666,12 +1687,7 @@ static void uart_dtr_rts(struct tty_port *port, int onoff)
 	uport = uart_port_ref(state);
 	if (!uport)
 		return;
-
+	uart_port_dtr_rts(uport, raise);
-	if (onoff)
-		uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
-	else
-		uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
-
 	uart_port_deref(uport);
 }
 
@@ -2083,8 +2099,7 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
 
 	tty_dev = device_find_child(uport->dev, &match, serial_match_port);
 	if (tty_dev && device_may_wakeup(tty_dev)) {
-		if (!enable_irq_wake(uport->irq))
+		enable_irq_wake(uport->irq);
-			uport->irq_wake = 1;
 		put_device(tty_dev);
 		mutex_unlock(&port->mutex);
 		return 0;
@@ -2147,10 +2162,8 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
 
 	tty_dev = device_find_child(uport->dev, &match, serial_match_port);
 	if (!uport->suspended && device_may_wakeup(tty_dev)) {
-		if (uport->irq_wake) {
+		if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq))))
 			disable_irq_wake(uport->irq);
-			uport->irq_wake = 0;
-		}
 		put_device(tty_dev);
 		mutex_unlock(&port->mutex);
 		return 0;

drivers/tty/serial/sh-sci.c

@@ -3073,8 +3073,7 @@ static struct plat_sci_port *sci_parse_dt(struct platform_device *pdev,
 	p->type = SCI_OF_TYPE(match->data);
 	p->regtype = SCI_OF_REGTYPE(match->data);
 
-	if (of_find_property(np, "uart-has-rtscts", NULL))
+	sp->has_rtscts = of_property_read_bool(np, "uart-has-rtscts");
-		sp->has_rtscts = true;
 
 	return p;
 }

drivers/tty/serial/sprd_serial.c

@@ -63,6 +63,7 @@
 
 /* interrupt clear register */
 #define SPRD_ICLR		0x0014
+#define SPRD_ICLR_TIMEOUT	BIT(13)
 
 /* line control register */
 #define SPRD_LCR		0x0018
@@ -298,7 +299,8 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
 		return IRQ_NONE;
 	}
 
-	serial_out(port, SPRD_ICLR, ~0);
+	if (ims & SPRD_IMSR_TIMEOUT)
+		serial_out(port, SPRD_ICLR, SPRD_ICLR_TIMEOUT);
 
 	if (ims & (SPRD_IMSR_RX_FIFO_FULL |
 		SPRD_IMSR_BREAK_DETECT | SPRD_IMSR_TIMEOUT))
@@ -729,8 +731,8 @@ static int sprd_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(&pdev->dev, "not provide irq resource\n");
+		dev_err(&pdev->dev, "not provide irq resource: %d\n", irq);
-		return -ENODEV;
+		return irq;
 	}
 	up->irq = irq;
 

drivers/tty/serial/st-asc.c

@@ -310,7 +310,7 @@ static void asc_receive_chars(struct uart_port *port)
 	if (mode == ASC_CTL_MODE_8BIT || mode == ASC_CTL_MODE_8BIT_PAR)
 		ignore_pe = true;
 
-	if (port->irq_wake)
+	if (irqd_is_wakeup_set(irq_get_irq_data(port->irq)))
 		pm_wakeup_event(tport->tty->dev, 0);
 
 	while ((status = asc_in(port, ASC_STA)) & ASC_STA_RBF) {

drivers/tty/serial/stm32-usart.c

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) Maxime Coquelin 2015
+ * Copyright (C) STMicroelectronics SA 2017
  * Authors:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
  *	     Gerald Baeza <gerald.baeza@st.com>
  * License terms:  GNU General Public License (GPL), version 2
@@ -25,6 +26,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
 #include <linux/spinlock.h>
@@ -110,14 +112,13 @@ static void stm32_receive_chars(struct uart_port *port, bool threaded)
 	unsigned long c;
 	u32 sr;
 	char flag;
-	static int last_res = RX_BUF_L;
 
-	if (port->irq_wake)
+	if (irqd_is_wakeup_set(irq_get_irq_data(port->irq)))
 		pm_wakeup_event(tport->tty->dev, 0);
 
-	while (stm32_pending_rx(port, &sr, &last_res, threaded)) {
+	while (stm32_pending_rx(port, &sr, &stm32_port->last_res, threaded)) {
 		sr |= USART_SR_DUMMY_RX;
-		c = stm32_get_char(port, &sr, &last_res);
+		c = stm32_get_char(port, &sr, &stm32_port->last_res);
 		flag = TTY_NORMAL;
 		port->icount.rx++;
 
@@ -202,7 +203,7 @@ static void stm32_transmit_chars_pio(struct uart_port *port)
 	ret = readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
 						isr,
 						(isr & USART_SR_TXE),
-						10, 100);
+						10, 100000);
 
 	if (ret)
 		dev_err(port->dev, "tx empty not set\n");
@@ -326,6 +327,10 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
 
 	sr = readl_relaxed(port->membase + ofs->isr);
 
+	if ((sr & USART_SR_WUF) && (ofs->icr != UNDEF_REG))
+		writel_relaxed(USART_ICR_WUCF,
+			       port->membase + ofs->icr);
+
 	if ((sr & USART_SR_RXNE) && !(stm32_port->rx_ch))
 		stm32_receive_chars(port, false);
 
@@ -442,6 +447,7 @@ static int stm32_startup(struct uart_port *port)
 {
 	struct stm32_port *stm32_port = to_stm32_port(port);
 	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+	struct stm32_usart_config *cfg = &stm32_port->info->cfg;
 	const char *name = to_platform_device(port->dev)->name;
 	u32 val;
 	int ret;
@@ -452,7 +458,18 @@ static int stm32_startup(struct uart_port *port)
 	if (ret)
 		return ret;
 
+	if (cfg->has_wakeup && stm32_port->wakeirq >= 0) {
+		ret = dev_pm_set_dedicated_wake_irq(port->dev,
+						    stm32_port->wakeirq);
+		if (ret) {
+			free_irq(port->irq, port);
+			return ret;
+		}
+	}
+
 	val = USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
+	if (stm32_port->fifoen)
+		val |= USART_CR1_FIFOEN;
 	stm32_set_bits(port, ofs->cr1, val);
 
 	return 0;
@@ -467,8 +484,11 @@ static void stm32_shutdown(struct uart_port *port)
 
 	val = USART_CR1_TXEIE | USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
 	val |= BIT(cfg->uart_enable_bit);
+	if (stm32_port->fifoen)
+		val |= USART_CR1_FIFOEN;
 	stm32_clr_bits(port, ofs->cr1, val);
 
+	dev_pm_clear_wake_irq(port->dev);
 	free_irq(port->irq, port);
 }
 
@@ -496,6 +516,8 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	cr1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
 	cr1 |= BIT(cfg->uart_enable_bit);
+	if (stm32_port->fifoen)
+		cr1 |= USART_CR1_FIFOEN;
 	cr2 = 0;
 	cr3 = 0;
 
@@ -518,7 +540,7 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
 	port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS);
 	if (cflag & CRTSCTS) {
 		port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
-		cr3 |= USART_CR3_CTSE;
+		cr3 |= USART_CR3_CTSE | USART_CR3_RTSE;
 	}
 
 	usartdiv = DIV_ROUND_CLOSEST(port->uartclk, baud);
@@ -659,6 +681,8 @@ static int stm32_init_port(struct stm32_port *stm32port,
 	port->ops	= &stm32_uart_ops;
 	port->dev	= &pdev->dev;
 	port->irq	= platform_get_irq(pdev, 0);
+	stm32port->wakeirq = platform_get_irq(pdev, 1);
+	stm32port->fifoen = stm32port->info->cfg.has_fifo;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	port->membase = devm_ioremap_resource(&pdev->dev, res);
@@ -678,8 +702,10 @@ static int stm32_init_port(struct stm32_port *stm32port,
 		return ret;
 
 	stm32port->port.uartclk = clk_get_rate(stm32port->clk);
-	if (!stm32port->port.uartclk)
+	if (!stm32port->port.uartclk) {
+		clk_disable_unprepare(stm32port->clk);
 		ret = -EINVAL;
+	}
 
 	return ret;
 }
@@ -693,8 +719,10 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
 		return NULL;
 
 	id = of_alias_get_id(np, "serial");
-	if (id < 0)
+	if (id < 0) {
-		id = 0;
+		dev_err(&pdev->dev, "failed to get alias id, errno %d\n", id);
+		return NULL;
+	}
 
 	if (WARN_ON(id >= STM32_MAX_PORTS))
 		return NULL;
@@ -702,6 +730,7 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
 	stm32_ports[id].hw_flow_control = of_property_read_bool(np,
 							"st,hw-flow-ctrl");
 	stm32_ports[id].port.line = id;
+	stm32_ports[id].last_res = RX_BUF_L;
 	return &stm32_ports[id];
 }
 
@@ -711,6 +740,8 @@ static const struct of_device_id stm32_match[] = {
 	{ .compatible = "st,stm32-uart", .data = &stm32f4_info},
 	{ .compatible = "st,stm32f7-usart", .data = &stm32f7_info},
 	{ .compatible = "st,stm32f7-uart", .data = &stm32f7_info},
+	{ .compatible = "st,stm32h7-usart", .data = &stm32h7_info},
+	{ .compatible = "st,stm32h7-uart", .data = &stm32h7_info},
 	{},
 };
 
@@ -860,9 +891,15 @@ static int stm32_serial_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	if (stm32port->info->cfg.has_wakeup && stm32port->wakeirq >= 0) {
+		ret = device_init_wakeup(&pdev->dev, true);
+		if (ret)
+			goto err_uninit;
+	}
+
 	ret = uart_add_one_port(&stm32_usart_driver, &stm32port->port);
 	if (ret)
-		return ret;
+		goto err_nowup;
 
 	ret = stm32_of_dma_rx_probe(stm32port, pdev);
 	if (ret)
@@ -875,6 +912,15 @@ static int stm32_serial_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, &stm32port->port);
 
 	return 0;
+
+err_nowup:
+	if (stm32port->info->cfg.has_wakeup && stm32port->wakeirq >= 0)
+		device_init_wakeup(&pdev->dev, false);
+
+err_uninit:
+	clk_disable_unprepare(stm32port->clk);
+
+	return ret;
 }
 
 static int stm32_serial_remove(struct platform_device *pdev)
@@ -882,6 +928,7 @@ static int stm32_serial_remove(struct platform_device *pdev)
 	struct uart_port *port = platform_get_drvdata(pdev);
 	struct stm32_port *stm32_port = to_stm32_port(port);
 	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+	struct stm32_usart_config *cfg = &stm32_port->info->cfg;
 
 	stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAR);
 
@@ -903,6 +950,9 @@ static int stm32_serial_remove(struct platform_device *pdev)
 				  TX_BUF_L, stm32_port->tx_buf,
 				  stm32_port->tx_dma_buf);
 
+	if (cfg->has_wakeup && stm32_port->wakeirq >= 0)
+		device_init_wakeup(&pdev->dev, false);
+
 	clk_disable_unprepare(stm32_port->clk);
 
 	return uart_remove_one_port(&stm32_usart_driver, port);
@@ -1008,11 +1058,66 @@ static struct uart_driver stm32_usart_driver = {
 	.cons		= STM32_SERIAL_CONSOLE,
 };
 
+#ifdef CONFIG_PM_SLEEP
+static void stm32_serial_enable_wakeup(struct uart_port *port, bool enable)
+{
+	struct stm32_port *stm32_port = to_stm32_port(port);
+	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+	struct stm32_usart_config *cfg = &stm32_port->info->cfg;
+	u32 val;
+
+	if (!cfg->has_wakeup || stm32_port->wakeirq < 0)
+		return;
+
+	if (enable) {
+		stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+		stm32_set_bits(port, ofs->cr1, USART_CR1_UESM);
+		val = readl_relaxed(port->membase + ofs->cr3);
+		val &= ~USART_CR3_WUS_MASK;
+		/* Enable Wake up interrupt from low power on start bit */
+		val |= USART_CR3_WUS_START_BIT | USART_CR3_WUFIE;
+		writel_relaxed(val, port->membase + ofs->cr3);
+		stm32_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
+	} else {
+		stm32_clr_bits(port, ofs->cr1, USART_CR1_UESM);
+	}
+}
+
+static int stm32_serial_suspend(struct device *dev)
+{
+	struct uart_port *port = dev_get_drvdata(dev);
+
+	uart_suspend_port(&stm32_usart_driver, port);
+
+	if (device_may_wakeup(dev))
+		stm32_serial_enable_wakeup(port, true);
+	else
+		stm32_serial_enable_wakeup(port, false);
+
+	return 0;
+}
+
+static int stm32_serial_resume(struct device *dev)
+{
+	struct uart_port *port = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		stm32_serial_enable_wakeup(port, false);
+
+	return uart_resume_port(&stm32_usart_driver, port);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops stm32_serial_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(stm32_serial_suspend, stm32_serial_resume)
+};
+
 static struct platform_driver stm32_serial_driver = {
 	.probe		= stm32_serial_probe,
 	.remove		= stm32_serial_remove,
 	.driver	= {
 		.name	= DRIVER_NAME,
+		.pm	= &stm32_serial_pm_ops,
 		.of_match_table = of_match_ptr(stm32_match),
 	},
 };

drivers/tty/serial/stm32-usart.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) Maxime Coquelin 2015
+ * Copyright (C) STMicroelectronics SA 2017
  * Authors:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
  *	     Gerald Baeza <gerald_baeza@yahoo.fr>
  * License terms:  GNU General Public License (GPL), version 2
@@ -24,6 +25,8 @@ struct stm32_usart_offsets {
 struct stm32_usart_config {
 	u8 uart_enable_bit; /* USART_CR1_UE */
 	bool has_7bits_data;
+	bool has_wakeup;
+	bool has_fifo;
 };
 
 struct stm32_usart_info {
@@ -74,6 +77,28 @@ struct stm32_usart_info stm32f7_info = {
 	}
 };
 
+struct stm32_usart_info stm32h7_info = {
+	.ofs = {
+		.cr1	= 0x00,
+		.cr2	= 0x04,
+		.cr3	= 0x08,
+		.brr	= 0x0c,
+		.gtpr	= 0x10,
+		.rtor	= 0x14,
+		.rqr	= 0x18,
+		.isr	= 0x1c,
+		.icr	= 0x20,
+		.rdr	= 0x24,
+		.tdr	= 0x28,
+	},
+	.cfg = {
+		.uart_enable_bit = 0,
+		.has_7bits_data = true,
+		.has_wakeup = true,
+		.has_fifo = true,
+	}
+};
+
 /* USART_SR (F4) / USART_ISR (F7) */
 #define USART_SR_PE		BIT(0)
 #define USART_SR_FE		BIT(1)
@@ -93,6 +118,7 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_SR_BUSY		BIT(16)		/* F7 */
 #define USART_SR_CMF		BIT(17)		/* F7 */
 #define USART_SR_SBKF		BIT(18)		/* F7 */
+#define USART_SR_WUF		BIT(20)		/* H7 */
 #define USART_SR_TEACK		BIT(21)		/* F7 */
 #define USART_SR_ERR_MASK	(USART_SR_LBD | USART_SR_ORE | \
 				 USART_SR_FE | USART_SR_PE)
@@ -113,6 +139,7 @@ struct stm32_usart_info stm32f7_info = {
 /* USART_CR1 */
 #define USART_CR1_SBK		BIT(0)
 #define USART_CR1_RWU		BIT(1)		/* F4 */
+#define USART_CR1_UESM		BIT(1)		/* H7 */
 #define USART_CR1_RE		BIT(2)
 #define USART_CR1_TE		BIT(3)
 #define USART_CR1_IDLEIE	BIT(4)
@@ -134,6 +161,7 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_CR1_EOBIE		BIT(27)		/* F7 */
 #define USART_CR1_M1		BIT(28)		/* F7 */
 #define USART_CR1_IE_MASK	(GENMASK(8, 4) | BIT(14) | BIT(26) | BIT(27))
+#define USART_CR1_FIFOEN	BIT(29)		/* H7 */
 
 /* USART_CR2 */
 #define USART_CR2_ADD_MASK	GENMASK(3, 0)	/* F4 */
@@ -175,6 +203,9 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_CR3_DEM		BIT(14)		/* F7 */
 #define USART_CR3_DEP		BIT(15)		/* F7 */
 #define USART_CR3_SCARCNT_MASK	GENMASK(19, 17)	/* F7 */
+#define USART_CR3_WUS_MASK	GENMASK(21, 20)	/* H7 */
+#define USART_CR3_WUS_START_BIT	BIT(21)		/* H7 */
+#define USART_CR3_WUFIE		BIT(22)		/* H7 */
 
 /* USART_GTPR */
 #define USART_GTPR_PSC_MASK	GENMASK(7, 0)
@@ -203,9 +234,10 @@ struct stm32_usart_info stm32f7_info = {
 #define USART_ICR_RTOCF		BIT(11)		/* F7 */
 #define USART_ICR_EOBCF		BIT(12)		/* F7 */
 #define USART_ICR_CMCF		BIT(17)		/* F7 */
+#define USART_ICR_WUCF		BIT(20)		/* H7 */
 
 #define STM32_SERIAL_NAME "ttyS"
-#define STM32_MAX_PORTS 6
+#define STM32_MAX_PORTS 8
 
 #define RX_BUF_L 200		 /* dma rx buffer length     */
 #define RX_BUF_P RX_BUF_L	 /* dma rx buffer period     */
@@ -221,8 +253,11 @@ struct stm32_port {
 	struct dma_chan *tx_ch;  /* dma tx channel            */
 	dma_addr_t tx_dma_buf;   /* dma tx buffer bus address */
 	unsigned char *tx_buf;   /* dma tx buffer cpu address */
+	int last_res;
 	bool tx_dma_busy;	 /* dma tx busy               */
 	bool hw_flow_control;
+	bool fifoen;
+	int wakeirq;
 };
 
 static struct stm32_port stm32_ports[STM32_MAX_PORTS];

drivers/tty/serial/sunsab.c

@@ -819,7 +819,7 @@ static int sunsab_verify_port(struct uart_port *port, struct serial_struct *ser)
 	return -EINVAL;
 }
 
-static struct uart_ops sunsab_pops = {
+static const struct uart_ops sunsab_pops = {
 	.tx_empty	= sunsab_tx_empty,
 	.set_mctrl	= sunsab_set_mctrl,
 	.get_mctrl	= sunsab_get_mctrl,

drivers/tty/serial/sunsu.c

@@ -958,7 +958,7 @@ sunsu_type(struct uart_port *port)
 	return uart_config[type].name;
 }
 
-static struct uart_ops sunsu_pops = {
+static const struct uart_ops sunsu_pops = {
 	.tx_empty	= sunsu_tx_empty,
 	.set_mctrl	= sunsu_set_mctrl,
 	.get_mctrl	= sunsu_get_mctrl,
@@ -1212,8 +1212,8 @@ static int sunsu_kbd_ms_init(struct uart_sunsu_port *up)
 	if (up->port.type == PORT_UNKNOWN)
 		return -ENODEV;
 
-	printk("%s: %s port at %llx, irq %u\n",
+	printk("%pOF: %s port at %llx, irq %u\n",
-	       up->port.dev->of_node->full_name,
+	       up->port.dev->of_node,
 	       (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
 	       (unsigned long long) up->port.mapbase,
 	       up->port.irq);

drivers/tty/serial/ucc_uart.c

@@ -1085,7 +1085,7 @@ static int qe_uart_verify_port(struct uart_port *port,
  *
  * Details on these functions can be found in Documentation/serial/driver
  */
-static struct uart_ops qe_uart_pops = {
+static const struct uart_ops qe_uart_pops = {
 	.tx_empty       = qe_uart_tx_empty,
 	.set_mctrl      = qe_uart_set_mctrl,
 	.get_mctrl      = qe_uart_get_mctrl,

drivers/tty/serial/xilinx_uartps.c

@@ -1163,7 +1163,7 @@ static void cdns_uart_console_putchar(struct uart_port *port, int ch)
 	writel(ch, port->membase + CDNS_UART_FIFO);
 }
 
-static void __init cdns_early_write(struct console *con, const char *s,
+static void cdns_early_write(struct console *con, const char *s,
 				    unsigned n)
 {
 	struct earlycon_device *dev = con->data;

drivers/tty/synclink.c

@@ -884,7 +884,7 @@ static int synclink_init_one (struct pci_dev *dev,
 				     const struct pci_device_id *ent);
 static void synclink_remove_one (struct pci_dev *dev);
 
-static struct pci_device_id synclink_pci_tbl[] = {
+static const struct pci_device_id synclink_pci_tbl[] = {
 	{ PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
 	{ PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
 	{ 0, }, /* terminate list */

drivers/tty/synclink_gt.c

@@ -95,7 +95,7 @@ MODULE_LICENSE("GPL");
 #define MGSL_MAGIC 0x5401
 #define MAX_DEVICES 32
 
-static struct pci_device_id pci_table[] = {
+static const struct pci_device_id pci_table[] = {
 	{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 	{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
 	{PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},

drivers/tty/synclinkmp.c

@@ -479,7 +479,7 @@ static char *driver_version = "$Revision: 4.38 $";
 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 static void synclinkmp_remove_one(struct pci_dev *dev);
 
-static struct pci_device_id synclinkmp_pci_tbl[] = {
+static const struct pci_device_id synclinkmp_pci_tbl[] = {
 	{ PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 	{ 0, }, /* terminate list */
 };

drivers/tty/tty_buffer.c

@@ -361,6 +361,32 @@ int tty_insert_flip_string_flags(struct tty_port *port,
 }
 EXPORT_SYMBOL(tty_insert_flip_string_flags);
 
+/**
+ *	__tty_insert_flip_char   -	Add one character to the tty buffer
+ *	@port: tty port
+ *	@ch: character
+ *	@flag: flag byte
+ *
+ *	Queue a single byte to the tty buffering, with an optional flag.
+ *	This is the slow path of tty_insert_flip_char.
+ */
+int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag)
+{
+	struct tty_buffer *tb;
+	int flags = (flag == TTY_NORMAL) ? TTYB_NORMAL : 0;
+
+	if (!__tty_buffer_request_room(port, 1, flags))
+		return 0;
+
+	tb = port->buf.tail;
+	if (~tb->flags & TTYB_NORMAL)
+		*flag_buf_ptr(tb, tb->used) = flag;
+	*char_buf_ptr(tb, tb->used++) = ch;
+
+	return 1;
+}
+EXPORT_SYMBOL(__tty_insert_flip_char);
+
 /**
  *	tty_schedule_flip	-	push characters to ldisc
  *	@port: tty port to push from

drivers/tty/tty_io.c

@@ -462,6 +462,14 @@ static int hung_up_tty_fasync(int fd, struct file *file, int on)
 	return -ENOTTY;
 }
 
+static void tty_show_fdinfo(struct seq_file *m, struct file *file)
+{
+	struct tty_struct *tty = file_tty(file);
+
+	if (tty && tty->ops && tty->ops->show_fdinfo)
+		tty->ops->show_fdinfo(tty, m);
+}
+
 static const struct file_operations tty_fops = {
 	.llseek		= no_llseek,
 	.read		= tty_read,
@@ -472,6 +480,7 @@ static const struct file_operations tty_fops = {
 	.open		= tty_open,
 	.release	= tty_release,
 	.fasync		= tty_fasync,
+	.show_fdinfo	= tty_show_fdinfo,
 };
 
 static const struct file_operations console_fops = {

include/linux/mcb.h

@@ -136,5 +136,7 @@ extern struct resource *mcb_request_mem(struct mcb_device *dev,
 					const char *name);
 extern void mcb_release_mem(struct resource *mem);
 extern int mcb_get_irq(struct mcb_device *dev);
+extern struct resource *mcb_get_resource(struct mcb_device *dev,
+					 unsigned int type);
 
 #endif /* _LINUX_MCB_H */

include/linux/serial_8250.h

@@ -80,9 +80,10 @@ struct uart_8250_ops {
 };
 
 struct uart_8250_em485 {
-	struct timer_list	start_tx_timer; /* "rs485 start tx" timer */
+	struct hrtimer		start_tx_timer; /* "rs485 start tx" timer */
-	struct timer_list	stop_tx_timer;  /* "rs485 stop tx" timer */
+	struct hrtimer		stop_tx_timer;  /* "rs485 stop tx" timer */
-	struct timer_list	*active_timer;  /* pointer to active timer */
+	struct hrtimer		*active_timer;  /* pointer to active timer */
+	struct uart_8250_port	*port;          /* for hrtimer callbacks */
 };
 
 /*

include/linux/serial_core.h

@@ -20,7 +20,7 @@
 #ifndef LINUX_SERIAL_CORE_H
 #define LINUX_SERIAL_CORE_H
 
-
+#include <linux/bitops.h>
 #include <linux/compiler.h>
 #include <linux/interrupt.h>
 #include <linux/circ_buf.h>
@@ -144,7 +144,7 @@ struct uart_port {
 	unsigned char		x_char;			/* xon/xoff char */
 	unsigned char		regshift;		/* reg offset shift */
 	unsigned char		iotype;			/* io access style */
-	unsigned char		unused1;
+	unsigned char		quirks;			/* internal quirks */
 
 #define UPIO_PORT		(SERIAL_IO_PORT)	/* 8b I/O port access */
 #define UPIO_HUB6		(SERIAL_IO_HUB6)	/* Hub6 ISA card */
@@ -155,6 +155,9 @@ struct uart_port {
 #define UPIO_MEM32BE		(SERIAL_IO_MEM32BE)	/* 32b big endian */
 #define UPIO_MEM16		(SERIAL_IO_MEM16)	/* 16b little endian */
 
+	/* quirks must be updated while holding port mutex */
+#define UPQ_NO_TXEN_TEST	BIT(0)
+
 	unsigned int		read_status_mask;	/* driver specific */
 	unsigned int		ignore_status_mask;	/* driver specific */
 	struct uart_state	*state;			/* pointer to parent state */
@@ -175,7 +178,6 @@ struct uart_port {
 	 * [for bit definitions in the UPF_CHANGE_MASK]
 	 *
 	 * Bits [0..UPF_LAST_USER] are userspace defined/visible/changeable
-	 * except bit 15 (UPF_NO_TXEN_TEST) which is masked off.
 	 * The remaining bits are serial-core specific and not modifiable by
 	 * userspace.
 	 */
@@ -192,7 +194,6 @@ struct uart_port {
 #define UPF_SPD_SHI		((__force upf_t) ASYNC_SPD_SHI        /* 12 */ )
 #define UPF_LOW_LATENCY		((__force upf_t) ASYNC_LOW_LATENCY    /* 13 */ )
 #define UPF_BUGGY_UART		((__force upf_t) ASYNC_BUGGY_UART     /* 14 */ )
-#define UPF_NO_TXEN_TEST	((__force upf_t) (1 << 15))
 #define UPF_MAGIC_MULTIPLIER	((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ )
 
 #define UPF_NO_THRE_TEST	((__force upf_t) (1 << 19))
@@ -246,7 +247,6 @@ struct uart_port {
 	struct device		*dev;			/* parent device */
 	unsigned char		hub6;			/* this should be in the 8250 driver */
 	unsigned char		suspended;
-	unsigned char		irq_wake;
 	unsigned char		unused[2];
 	const char		*name;			/* port name */
 	struct attribute_group	*attr_group;		/* port specific attributes */

include/linux/tty_driver.h

@@ -243,6 +243,7 @@
 #include <linux/list.h>
 #include <linux/cdev.h>
 #include <linux/termios.h>
+#include <linux/seq_file.h>
 
 struct tty_struct;
 struct tty_driver;
@@ -285,6 +286,7 @@ struct tty_operations {
 	int (*set_termiox)(struct tty_struct *tty, struct termiox *tnew);
 	int (*get_icount)(struct tty_struct *tty,
 				struct serial_icounter_struct *icount);
+	void (*show_fdinfo)(struct tty_struct *tty, struct seq_file *m);
 #ifdef CONFIG_CONSOLE_POLL
 	int (*poll_init)(struct tty_driver *driver, int line, char *options);
 	int (*poll_get_char)(struct tty_driver *driver, int line);

include/linux/tty_flip.h

@@ -12,6 +12,7 @@ extern int tty_prepare_flip_string(struct tty_port *port,
 		unsigned char **chars, size_t size);
 extern void tty_flip_buffer_push(struct tty_port *port);
 void tty_schedule_flip(struct tty_port *port);
+int __tty_insert_flip_char(struct tty_port *port, unsigned char ch, char flag);
 
 static inline int tty_insert_flip_char(struct tty_port *port,
 					unsigned char ch, char flag)
@@ -26,7 +27,7 @@ static inline int tty_insert_flip_char(struct tty_port *port,
 		*char_buf_ptr(tb, tb->used++) = ch;
 		return 1;
 	}
-	return tty_insert_flip_string_flags(port, &ch, &flag, 1);
+	return __tty_insert_flip_char(port, ch, flag);
 }
 
 static inline int tty_insert_flip_string(struct tty_port *port,

include/uapi/linux/serial_core.h

@@ -56,8 +56,6 @@
 #define PORT_ALTR_16550_F128 28 /* Altera 16550 UART with 128 FIFOs */
 #define PORT_RT2880	29	/* Ralink RT2880 internal UART */
 #define PORT_16550A_FSL64 30	/* Freescale 16550 UART with 64 FIFOs */
-#define PORT_DA830	31	/* TI DA8xx/66AK2x */
-#define PORT_MAX_8250	31	/* max port ID */
 
 /*
  * ARM specific type numbers.  These are not currently guaranteed
@@ -70,12 +68,17 @@
 #define PORT_CLPS711X	33
 #define PORT_SA1100	34
 #define PORT_UART00	35
+#define PORT_OWL	36
 #define PORT_21285	37
 
 /* Sparc type numbers.  */
 #define PORT_SUNZILOG	38
 #define PORT_SUNSAB	39
 
+/* Intel EG20 */
+#define PORT_PCH_8LINE	44
+#define PORT_PCH_2LINE	45
+
 /* DEC */
 #define PORT_DZ		46
 #define PORT_ZS		47
@@ -205,8 +208,8 @@
 /* MAX310X */
 #define PORT_MAX310X	94
 
-/* High Speed UART for Medfield */
+/* TI DA8xx/66AK2x */
-#define PORT_MFD	95
+#define PORT_DA830	95
 
 /* TI OMAP-UART */
 #define PORT_OMAP	96
@@ -271,4 +274,7 @@
 /* MPS2 UART */
 #define PORT_MPS2UART	116
 
+/* MediaTek BTIF */
+#define PORT_MTK_BTIF	117
+
 #endif /* _UAPILINUX_SERIAL_CORE_H */