Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog

* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  [WATCHDOG] orion5x_wdt.c: add spinlocking
  [WATCHDOG] Orion: add hardware watchdog support
  [WATCHDOG] omap_wdt.c: cleanup a bit omap_wdt.c
  [WATCHDOG] omap_wdt.c: another ioremap() fix
  [WATCHDOG] omap_wdt.c: sync linux-omap changes
  [WATCHDOG] Add AT91SAM9X watchdog
  [WATCHDOG] Add driver for winbond w83697ug/uf watchdog feature
  [WATCHDOG] add watchdog driver IT8716 IT8726 IT8712J/K

arch/arm/mach-orion5x/include/mach/orion5x.h

@@ -157,9 +157,11 @@
 #define CPU_CONF		ORION5X_BRIDGE_REG(0x100)
 #define CPU_CTRL		ORION5X_BRIDGE_REG(0x104)
 #define CPU_RESET_MASK		ORION5X_BRIDGE_REG(0x108)
+#define  WDT_RESET		0x0002
 #define CPU_SOFT_RESET		ORION5X_BRIDGE_REG(0x10c)
 #define POWER_MNG_CTRL_REG	ORION5X_BRIDGE_REG(0x11C)
 #define BRIDGE_CAUSE		ORION5X_BRIDGE_REG(0x110)
+#define  WDT_INT_REQ		0x0008
 #define BRIDGE_MASK		ORION5X_BRIDGE_REG(0x114)
 #define  BRIDGE_INT_TIMER0	0x0002
 #define  BRIDGE_INT_TIMER1	0x0004

arch/arm/plat-omap/devices.c

@@ -441,16 +441,8 @@ static inline void omap_init_uwire(void) {}
 
 #if	defined(CONFIG_OMAP_WATCHDOG) || defined(CONFIG_OMAP_WATCHDOG_MODULE)
 
-#ifdef CONFIG_ARCH_OMAP24XX
-#define	OMAP_WDT_BASE		0x48022000
-#else
-#define	OMAP_WDT_BASE		0xfffeb000
-#endif
-
 static struct resource wdt_resources[] = {
 	{
-		.start		= OMAP_WDT_BASE,
-		.end		= OMAP_WDT_BASE + 0x4f,
 		.flags		= IORESOURCE_MEM,
 	},
 };
@@ -464,6 +456,19 @@ static struct platform_device omap_wdt_device = {
 
 static void omap_init_wdt(void)
 {
+	if (cpu_is_omap16xx())
+		wdt_resources[0].start = 0xfffeb000;
+	else if (cpu_is_omap2420())
+		wdt_resources[0].start = 0x48022000; /* WDT2 */
+	else if (cpu_is_omap2430())
+		wdt_resources[0].start = 0x49016000; /* WDT2 */
+	else if (cpu_is_omap343x())
+		wdt_resources[0].start = 0x48314000; /* WDT2 */
+	else
+		return;
+
+	wdt_resources[0].end = wdt_resources[0].start + 0x4f;
+
 	(void) platform_device_register(&omap_wdt_device);
 }
 #else

drivers/watchdog/Kconfig

@@ -66,6 +66,13 @@ config AT91RM9200_WATCHDOG
 	  Watchdog timer embedded into AT91RM9200 chips. This will reboot your
 	  system when the timeout is reached.
 
+config AT91SAM9X_WATCHDOG
+	tristate "AT91SAM9X watchdog"
+	depends on WATCHDOG && (ARCH_AT91SAM9260 || ARCH_AT91SAM9261)
+	help
+	  Watchdog timer embedded into AT91SAM9X chips. This will reboot your
+	  system when the timeout is reached.
+
 config 21285_WATCHDOG
 	tristate "DC21285 watchdog"
 	depends on FOOTBRIDGE
@@ -217,6 +224,15 @@ config DAVINCI_WATCHDOG
 	  NOTE: once enabled, this timer cannot be disabled.
 	  Say N if you are unsure.
 
+config ORION5X_WATCHDOG
+	tristate "Orion5x watchdog"
+	depends on ARCH_ORION5X
+	help
+	  Say Y here if to include support for the watchdog timer
+	  in the Orion5x ARM SoCs.
+	  To compile this driver as a module, choose M here: the
+	  module will be called orion5x_wdt.
+
 # ARM26 Architecture
 
 # AVR32 Architecture
@@ -416,6 +432,18 @@ config IT8712F_WDT
 	  To compile this driver as a module, choose M here: the
 	  module will be called it8712f_wdt.
 
+config IT87_WDT
+	tristate "IT87 Watchdog Timer"
+	depends on X86 && EXPERIMENTAL
+	---help---
+	  This is the driver for the hardware watchdog on the ITE IT8716,
+	  IT8718, IT8726, IT8712(Version J,K) Super I/O chips. This watchdog
+	  simply watches your kernel to make sure it doesn't freeze, and if
+	  it does, it reboots your computer after a certain amount of time.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called it87_wdt.
+
 config HP_WATCHDOG
 	tristate "HP Proliant iLO 2 Hardware Watchdog Timer"
 	depends on X86
@@ -573,6 +601,21 @@ config W83697HF_WDT
 
 	  Most people will say N.
 
+config W83697UG_WDT
+	tristate "W83697UG/W83697UF Watchdog Timer"
+	depends on X86
+	---help---
+	  This is the driver for the hardware watchdog on the W83697UG/UF
+	  chipset as used in MSI Fuzzy CX700 VIA motherboards (and likely others).
+	  This watchdog simply watches your kernel to make sure it doesn't
+	  freeze, and if it does, it reboots your computer after a certain
+	  amount of time.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called w83697ug_wdt.
+
+	  Most people will say N.
+
 config W83877F_WDT
 	tristate "W83877F (EMACS) Watchdog Timer"
 	depends on X86

drivers/watchdog/Makefile

@@ -26,6 +26,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
 
 # ARM Architecture
 obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o
+obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o
 obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
 obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
 obj-$(CONFIG_977_WATCHDOG) += wdt977.o
@@ -39,6 +40,7 @@ obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
 obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
 obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
 obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
+obj-$(CONFIG_ORION5X_WATCHDOG) += orion5x_wdt.o
 
 # ARM26 Architecture
 
@@ -71,6 +73,7 @@ ifeq ($(CONFIG_ITCO_VENDOR_SUPPORT),y)
 obj-$(CONFIG_ITCO_WDT) += iTCO_vendor_support.o
 endif
 obj-$(CONFIG_IT8712F_WDT) += it8712f_wdt.o
+obj-$(CONFIG_IT87_WDT) += it87_wdt.o
 obj-$(CONFIG_HP_WATCHDOG) += hpwdt.o
 obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
 obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
@@ -83,6 +86,7 @@ obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
 obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o
 obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o
 obj-$(CONFIG_W83697HF_WDT) += w83697hf_wdt.o
+obj-$(CONFIG_W83697UG_WDT) += w83697ug_wdt.o
 obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
 obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o
 obj-$(CONFIG_MACHZ_WDT) += machzwd.o

drivers/watchdog/at91sam9_wdt.c

+/*
+ * Watchdog driver for Atmel AT91SAM9x processors.
+ *
+ * Copyright (C) 2008 Renaud CERRATO r.cerrato@til-technologies.fr
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+/*
+ * The Watchdog Timer Mode Register can be only written to once. If the
+ * timeout need to be set from Linux, be sure that the bootstrap or the
+ * bootloader doesn't write to this register.
+ */
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
+#include <linux/bitops.h>
+#include <linux/uaccess.h>
+
+#include <asm/arch/at91_wdt.h>
+
+#define DRV_NAME "AT91SAM9 Watchdog"
+
+/* AT91SAM9 watchdog runs a 12bit counter @ 256Hz,
+ * use this to convert a watchdog
+ * value from/to milliseconds.
+ */
+#define ms_to_ticks(t)	(((t << 8) / 1000) - 1)
+#define ticks_to_ms(t)	(((t + 1) * 1000) >> 8)
+
+/* Hardware timeout in seconds */
+#define WDT_HW_TIMEOUT 2
+
+/* Timer heartbeat (500ms) */
+#define WDT_TIMEOUT	(HZ/2)
+
+/* User land timeout */
+#define WDT_HEARTBEAT 15
+static int heartbeat = WDT_HEARTBEAT;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. "
+	"(default = " __MODULE_STRING(WDT_HEARTBEAT) ")");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
+	"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static void at91_ping(unsigned long data);
+
+static struct {
+	unsigned long next_heartbeat;	/* the next_heartbeat for the timer */
+	unsigned long open;
+	char expect_close;
+	struct timer_list timer;	/* The timer that pings the watchdog */
+} at91wdt_private;
+
+/* ......................................................................... */
+
+
+/*
+ * Reload the watchdog timer.  (ie, pat the watchdog)
+ */
+static inline void at91_wdt_reset(void)
+{
+	at91_sys_write(AT91_WDT_CR, AT91_WDT_KEY | AT91_WDT_WDRSTT);
+}
+
+/*
+ * Timer tick
+ */
+static void at91_ping(unsigned long data)
+{
+	if (time_before(jiffies, at91wdt_private.next_heartbeat) ||
+			(!nowayout && !at91wdt_private.open)) {
+		at91_wdt_reset();
+		mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
+	} else
+		printk(KERN_CRIT DRV_NAME": I will reset your machine !\n");
+}
+
+/*
+ * Watchdog device is opened, and watchdog starts running.
+ */
+static int at91_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &at91wdt_private.open))
+		return -EBUSY;
+
+	at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
+	mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
+
+	return nonseekable_open(inode, file);
+}
+
+/*
+ * Close the watchdog device.
+ */
+static int at91_wdt_close(struct inode *inode, struct file *file)
+{
+	clear_bit(0, &at91wdt_private.open);
+
+	/* stop internal ping */
+	if (!at91wdt_private.expect_close)
+		del_timer(&at91wdt_private.timer);
+
+	at91wdt_private.expect_close = 0;
+	return 0;
+}
+
+/*
+ * Set the watchdog time interval in 1/256Hz (write-once)
+ * Counter is 12 bit.
+ */
+static int at91_wdt_settimeout(unsigned int timeout)
+{
+	unsigned int reg;
+	unsigned int mr;
+
+	/* Check if disabled */
+	mr = at91_sys_read(AT91_WDT_MR);
+	if (mr & AT91_WDT_WDDIS) {
+		printk(KERN_ERR DRV_NAME": sorry, watchdog is disabled\n");
+		return -EIO;
+	}
+
+	/*
+	 * All counting occurs at SLOW_CLOCK / 128 = 256 Hz
+	 *
+	 * Since WDV is a 12-bit counter, the maximum period is
+	 * 4096 / 256 = 16 seconds.
+	 */
+	reg = AT91_WDT_WDRSTEN	/* causes watchdog reset */
+		/* | AT91_WDT_WDRPROC	causes processor reset only */
+		| AT91_WDT_WDDBGHLT	/* disabled in debug mode */
+		| AT91_WDT_WDD		/* restart at any time */
+		| (timeout & AT91_WDT_WDV);  /* timer value */
+	at91_sys_write(AT91_WDT_MR, reg);
+
+	return 0;
+}
+
+static const struct watchdog_info at91_wdt_info = {
+	.identity	= DRV_NAME,
+	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+};
+
+/*
+ * Handle commands from user-space.
+ */
+static long at91_wdt_ioctl(struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	int new_value;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		return copy_to_user(argp, &at91_wdt_info,
+				    sizeof(at91_wdt_info)) ? -EFAULT : 0;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+
+	case WDIOC_KEEPALIVE:
+		at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
+		return 0;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_value, p))
+			return -EFAULT;
+
+		heartbeat = new_value;
+		at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
+
+		return put_user(new_value, p);  /* return current value */
+
+	case WDIOC_GETTIMEOUT:
+		return put_user(heartbeat, p);
+	}
+	return -ENOTTY;
+}
+
+/*
+ * Pat the watchdog whenever device is written to.
+ */
+static ssize_t at91_wdt_write(struct file *file, const char *data, size_t len,
+      loff_t *ppos)
+{
+	if (!len)
+		return 0;
+
+	/* Scan for magic character */
+	if (!nowayout) {
+		size_t i;
+
+		at91wdt_private.expect_close = 0;
+
+		for (i = 0; i < len; i++) {
+			char c;
+			if (get_user(c, data + i))
+				return -EFAULT;
+			if (c == 'V') {
+				at91wdt_private.expect_close = 42;
+				break;
+			}
+		}
+	}
+
+	at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
+
+	return len;
+}
+
+/* ......................................................................... */
+
+static const struct file_operations at91wdt_fops = {
+	.owner			= THIS_MODULE,
+	.llseek			= no_llseek,
+	.unlocked_ioctl	= at91_wdt_ioctl,
+	.open			= at91_wdt_open,
+	.release		= at91_wdt_close,
+	.write			= at91_wdt_write,
+};
+
+static struct miscdevice at91wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &at91wdt_fops,
+};
+
+static int __init at91wdt_probe(struct platform_device *pdev)
+{
+	int res;
+
+	if (at91wdt_miscdev.parent)
+		return -EBUSY;
+	at91wdt_miscdev.parent = &pdev->dev;
+
+	/* Set watchdog */
+	res = at91_wdt_settimeout(ms_to_ticks(WDT_HW_TIMEOUT * 1000));
+	if (res)
+		return res;
+
+	res = misc_register(&at91wdt_miscdev);
+	if (res)
+		return res;
+
+	at91wdt_private.next_heartbeat = jiffies + heartbeat * HZ;
+	setup_timer(&at91wdt_private.timer, at91_ping, 0);
+	mod_timer(&at91wdt_private.timer, jiffies + WDT_TIMEOUT);
+
+	printk(KERN_INFO DRV_NAME " enabled (heartbeat=%d sec, nowayout=%d)\n",
+		heartbeat, nowayout);
+
+	return 0;
+}
+
+static int __exit at91wdt_remove(struct platform_device *pdev)
+{
+	int res;
+
+	res = misc_deregister(&at91wdt_miscdev);
+	if (!res)
+		at91wdt_miscdev.parent = NULL;
+
+	return res;
+}
+
+#ifdef CONFIG_PM
+
+static int at91wdt_suspend(struct platform_device *pdev, pm_message_t message)
+{
+	return 0;
+}
+
+static int at91wdt_resume(struct platform_device *pdev)
+{
+	return 0;
+}
+
+#else
+#define at91wdt_suspend	NULL
+#define at91wdt_resume	NULL
+#endif
+
+static struct platform_driver at91wdt_driver = {
+	.remove		= __exit_p(at91wdt_remove),
+	.suspend	= at91wdt_suspend,
+	.resume		= at91wdt_resume,
+	.driver		= {
+		.name	= "at91_wdt",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init at91sam_wdt_init(void)
+{
+	return platform_driver_probe(&at91wdt_driver, at91wdt_probe);
+}
+
+static void __exit at91sam_wdt_exit(void)
+{
+	platform_driver_unregister(&at91wdt_driver);
+}
+
+module_init(at91sam_wdt_init);
+module_exit(at91sam_wdt_exit);
+
+MODULE_AUTHOR("Renaud CERRATO <r.cerrato@til-technologies.fr>");
+MODULE_DESCRIPTION("Watchdog driver for Atmel AT91SAM9x processors");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/watchdog/omap_wdt.h

@@ -30,25 +30,15 @@
 #ifndef _OMAP_WATCHDOG_H
 #define _OMAP_WATCHDOG_H
 
-#define OMAP1610_WATCHDOG_BASE		0xfffeb000
-#define OMAP2420_WATCHDOG_BASE		0x48022000	/*WDT Timer 2 */
-
-#ifdef CONFIG_ARCH_OMAP24XX
-#define OMAP_WATCHDOG_BASE 		OMAP2420_WATCHDOG_BASE
-#else
-#define OMAP_WATCHDOG_BASE 		OMAP1610_WATCHDOG_BASE
-#define RM_RSTST_WKUP			0
-#endif
-
-#define OMAP_WATCHDOG_REV		(OMAP_WATCHDOG_BASE + 0x00)
-#define OMAP_WATCHDOG_SYS_CONFIG	(OMAP_WATCHDOG_BASE + 0x10)
-#define OMAP_WATCHDOG_STATUS		(OMAP_WATCHDOG_BASE + 0x14)
-#define OMAP_WATCHDOG_CNTRL		(OMAP_WATCHDOG_BASE + 0x24)
-#define OMAP_WATCHDOG_CRR		(OMAP_WATCHDOG_BASE + 0x28)
-#define OMAP_WATCHDOG_LDR		(OMAP_WATCHDOG_BASE + 0x2c)
-#define OMAP_WATCHDOG_TGR		(OMAP_WATCHDOG_BASE + 0x30)
-#define OMAP_WATCHDOG_WPS		(OMAP_WATCHDOG_BASE + 0x34)
-#define OMAP_WATCHDOG_SPR		(OMAP_WATCHDOG_BASE + 0x48)
+#define OMAP_WATCHDOG_REV		(0x00)
+#define OMAP_WATCHDOG_SYS_CONFIG	(0x10)
+#define OMAP_WATCHDOG_STATUS		(0x14)
+#define OMAP_WATCHDOG_CNTRL		(0x24)
+#define OMAP_WATCHDOG_CRR		(0x28)
+#define OMAP_WATCHDOG_LDR		(0x2c)
+#define OMAP_WATCHDOG_TGR		(0x30)
+#define OMAP_WATCHDOG_WPS		(0x34)
+#define OMAP_WATCHDOG_SPR		(0x48)
 
 /* Using the prescaler, the OMAP watchdog could go for many
  * months before firing.  These limits work without scaling,

drivers/watchdog/orion5x_wdt.c

+/*
+ * drivers/watchdog/orion5x_wdt.c
+ *
+ * Watchdog driver for Orion5x processors
+ *
+ * Author: Sylver Bruneau <sylver.bruneau@googlemail.com>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/init.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+
+/*
+ * Watchdog timer block registers.
+ */
+#define TIMER_CTRL		(TIMER_VIRT_BASE + 0x0000)
+#define  WDT_EN			0x0010
+#define WDT_VAL			(TIMER_VIRT_BASE + 0x0024)
+
+#define WDT_MAX_DURATION	(0xffffffff / ORION5X_TCLK)
+#define WDT_IN_USE		0
+#define WDT_OK_TO_CLOSE		1
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+static int heartbeat =  WDT_MAX_DURATION;	/* (seconds) */
+static unsigned long wdt_status;
+static spinlock_t wdt_lock;
+
+static void wdt_enable(void)
+{
+	u32 reg;
+
+	spin_lock(&wdt_lock);
+
+	/* Set watchdog duration */
+	writel(ORION5X_TCLK * heartbeat, WDT_VAL);
+
+	/* Clear watchdog timer interrupt */
+	reg = readl(BRIDGE_CAUSE);
+	reg &= ~WDT_INT_REQ;
+	writel(reg, BRIDGE_CAUSE);
+
+	/* Enable watchdog timer */
+	reg = readl(TIMER_CTRL);
+	reg |= WDT_EN;
+	writel(reg, TIMER_CTRL);
+
+	/* Enable reset on watchdog */
+	reg = readl(CPU_RESET_MASK);
+	reg |= WDT_RESET;
+	writel(reg, CPU_RESET_MASK);
+
+	spin_unlock(&wdt_lock);
+}
+
+static void wdt_disable(void)
+{
+	u32 reg;
+
+	spin_lock(&wdt_lock);
+
+	/* Disable reset on watchdog */
+	reg = readl(CPU_RESET_MASK);
+	reg &= ~WDT_RESET;
+	writel(reg, CPU_RESET_MASK);
+
+	/* Disable watchdog timer */
+	reg = readl(TIMER_CTRL);
+	reg &= ~WDT_EN;
+	writel(reg, TIMER_CTRL);
+
+	spin_unlock(&wdt_lock);
+}
+
+static int orion5x_wdt_get_timeleft(int *time_left)
+{
+	spin_lock(&wdt_lock);
+	*time_left = readl(WDT_VAL) / ORION5X_TCLK;
+	spin_unlock(&wdt_lock);
+	return 0;
+}
+
+static int orion5x_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(WDT_IN_USE, &wdt_status))
+		return -EBUSY;
+	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+	wdt_enable();
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t orion5x_wdt_write(struct file *file, const char *data,
+					size_t len, loff_t *ppos)
+{
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+			for (i = 0; i != len; i++) {
+				char c;
+
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					set_bit(WDT_OK_TO_CLOSE, &wdt_status);
+			}
+		}
+		wdt_enable();
+	}
+	return len;
+}
+
+static struct watchdog_info ident = {
+	.options	= WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
+			  WDIOF_KEEPALIVEPING,
+	.identity	= "Orion5x Watchdog",
+};
+
+
+static long orion5x_wdt_ioctl(struct file *file, unsigned int cmd,
+				unsigned long arg)
+{
+	int ret = -ENOTTY;
+	int time;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user((struct watchdog_info *)arg, &ident,
+				   sizeof(ident)) ? -EFAULT : 0;
+		break;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		ret = put_user(0, (int *)arg);
+		break;
+
+	case WDIOC_KEEPALIVE:
+		wdt_enable();
+		ret = 0;
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		ret = get_user(time, (int *)arg);
+		if (ret)
+			break;
+
+		if (time <= 0 || time > WDT_MAX_DURATION) {
+			ret = -EINVAL;
+			break;
+		}
+		heartbeat = time;
+		wdt_enable();
+		/* Fall through */
+
+	case WDIOC_GETTIMEOUT:
+		ret = put_user(heartbeat, (int *)arg);
+		break;
+
+	case WDIOC_GETTIMELEFT:
+		if (orion5x_wdt_get_timeleft(&time)) {
+			ret = -EINVAL;
+			break;
+		}
+		ret = put_user(time, (int *)arg);
+		break;
+	}
+	return ret;
+}
+
+static int orion5x_wdt_release(struct inode *inode, struct file *file)
+{
+	if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
+		wdt_disable();
+	else
+		printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
+					"timer will not stop\n");
+	clear_bit(WDT_IN_USE, &wdt_status);
+	clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+	return 0;
+}
+
+
+static const struct file_operations orion5x_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= orion5x_wdt_write,
+	.unlocked_ioctl	= orion5x_wdt_ioctl,
+	.open		= orion5x_wdt_open,
+	.release	= orion5x_wdt_release,
+};
+
+static struct miscdevice orion5x_wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &orion5x_wdt_fops,
+};
+
+static int __init orion5x_wdt_init(void)
+{
+	int ret;
+
+	spin_lock_init(&wdt_lock);
+
+	ret = misc_register(&orion5x_wdt_miscdev);
+	if (ret == 0)
+		printk("Orion5x Watchdog Timer: heartbeat %d sec\n",
+								heartbeat);
+
+	return ret;
+}
+
+static void __exit orion5x_wdt_exit(void)
+{
+	misc_deregister(&orion5x_wdt_miscdev);
+}
+
+module_init(orion5x_wdt_init);
+module_exit(orion5x_wdt_exit);
+
+MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
+MODULE_DESCRIPTION("Orion5x Processor Watchdog");
+
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default is "
+					__MODULE_STRING(WDT_MAX_DURATION) ")");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/watchdog/w83697ug_wdt.c

+/*
+ *	w83697ug/uf WDT driver
+ *
+ *	(c) Copyright 2008 Flemming Fransen <ff@nrvissing.net>
+ *              reused original code to supoprt w83697ug/uf.
+ *
+ *	Based on w83627hf_wdt.c which is based on advantechwdt.c
+ *	which is based on wdt.c.
+ *	Original copyright messages:
+ *
+ *	(c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
+ *		added support for W83627THF.
+ *
+ *	(c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
+ *
+ *	(c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
+ *
+ *	(c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ *				http://www.redhat.com
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ *
+ *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
+ *	warranty for any of this software. This material is provided
+ *	"AS-IS" and at no charge.
+ *
+ *	(c) Copyright 1995    Alan Cox <alan@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+
+#include <asm/system.h>
+
+#define WATCHDOG_NAME "w83697ug/uf WDT"
+#define PFX WATCHDOG_NAME ": "
+#define WATCHDOG_TIMEOUT 60		/* 60 sec default timeout */
+
+static unsigned long wdt_is_open;
+static char expect_close;
+static DEFINE_SPINLOCK(io_lock);
+
+static int wdt_io = 0x2e;
+module_param(wdt_io, int, 0);
+MODULE_PARM_DESC(wdt_io, "w83697ug/uf WDT io port (default 0x2e)");
+
+static int timeout = WATCHDOG_TIMEOUT;	/* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+	"Watchdog timeout in seconds. 1<= timeout <=255 (default="
+				__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+	"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/*
+ *	Kernel methods.
+ */
+
+#define WDT_EFER (wdt_io+0)   /* Extended Function Enable Registers */
+#define WDT_EFIR (wdt_io+0)   /* Extended Function Index Register
+							(same as EFER) */
+#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
+
+static void w83697ug_select_wd_register(void)
+{
+	unsigned char c;
+	unsigned char version;
+
+	outb_p(0x87, WDT_EFER); /* Enter extended function mode */
+	outb_p(0x87, WDT_EFER); /* Again according to manual */
+
+	outb(0x20, WDT_EFER); 	/* check chip version	*/
+	version = inb(WDT_EFDR);
+
+	if (version == 0x68) {	/* W83697UG 		*/
+		printk(KERN_INFO PFX "Watchdog chip version 0x%02x = "
+			"W83697UG/UF found at 0x%04x\n", version, wdt_io);
+
+		outb_p(0x2b, WDT_EFER);
+		c = inb_p(WDT_EFDR);    /* select WDT0 */
+		c &= ~0x04;
+		outb_p(0x2b, WDT_EFER);
+		outb_p(c, WDT_EFDR);	/* set pin118 to WDT0 */
+
+	} else {
+		printk(KERN_ERR PFX "No W83697UG/UF could be found\n");
+		return -EIO;
+	}
+
+	outb_p(0x07, WDT_EFER); /* point to logical device number reg */
+	outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
+	outb_p(0x30, WDT_EFER); /* select CR30 */
+	c = inb_p(WDT_EFDR);
+	outb_p(c || 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
+}
+
+static void w83697ug_unselect_wd_register(void)
+{
+	outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
+}
+
+static void w83697ug_init(void)
+{
+	unsigned char t;
+
+	w83697ug_select_wd_register();
+
+	outb_p(0xF6, WDT_EFER); /* Select CRF6 */
+	t = inb_p(WDT_EFDR);    /* read CRF6 */
+	if (t != 0) {
+		printk(KERN_INFO PFX "Watchdog already running."
+			" Resetting timeout to %d sec\n", timeout);
+		outb_p(timeout, WDT_EFDR);    /* Write back to CRF6 */
+	}
+	outb_p(0xF5, WDT_EFER); /* Select CRF5 */
+	t = inb_p(WDT_EFDR);    /* read CRF5 */
+	t &= ~0x0C;             /* set second mode &
+					disable keyboard turning off watchdog */
+	outb_p(t, WDT_EFDR);    /* Write back to CRF5 */
+
+	w83697ug_unselect_wd_register();
+}
+
+static void wdt_ctrl(int timeout)
+{
+	spin_lock(&io_lock);
+
+	w83697ug_select_wd_register();
+
+	outb_p(0xF4, WDT_EFER);    /* Select CRF4 */
+	outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */
+
+	w83697ug_unselect_wd_register();
+
+	spin_unlock(&io_lock);
+}
+
+static int wdt_ping(void)
+{
+	wdt_ctrl(timeout);
+	return 0;
+}
+
+static int wdt_disable(void)
+{
+	wdt_ctrl(0);
+	return 0;
+}
+
+static int wdt_set_heartbeat(int t)
+{
+	if (t < 1 || t > 255)
+		return -EINVAL;
+
+	timeout = t;
+	return 0;
+}
+
+static ssize_t wdt_write(struct file *file, const char __user *buf,
+						size_t count, loff_t *ppos)
+{
+	if (count) {
+		if (!nowayout) {
+			size_t i;
+
+			expect_close = 0;
+
+			for (i = 0; i != count; i++) {
+				char c;
+				if (get_user(c, buf + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 42;
+			}
+		}
+		wdt_ping();
+	}
+	return count;
+}
+
+static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	int new_timeout;
+	static const struct watchdog_info ident = {
+		.options =		WDIOF_KEEPALIVEPING |
+					WDIOF_SETTIMEOUT |
+					WDIOF_MAGICCLOSE,
+		.firmware_version =	1,
+		.identity =		"W83697UG WDT",
+	};
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user(argp, &ident, sizeof(ident)))
+			return -EFAULT;
+		break;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+
+	case WDIOC_SETOPTIONS:
+	{
+		int options, retval = -EINVAL;
+
+		if (get_user(options, p))
+			return -EFAULT;
+
+		if (options & WDIOS_DISABLECARD) {
+			wdt_disable();
+			retval = 0;
+		}
+
+		if (options & WDIOS_ENABLECARD) {
+			wdt_ping();
+			retval = 0;
+		}
+
+		return retval;
+	}
+
+	case WDIOC_KEEPALIVE:
+		wdt_ping();
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_timeout, p))
+			return -EFAULT;
+		if (wdt_set_heartbeat(new_timeout))
+			return -EINVAL;
+		wdt_ping();
+		/* Fall */
+
+	case WDIOC_GETTIMEOUT:
+		return put_user(timeout, p);
+
+	default:
+		return -ENOTTY;
+	}
+	return 0;
+}
+
+static int wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &wdt_is_open))
+		return -EBUSY;
+	/*
+	 *	Activate
+	 */
+
+	wdt_ping();
+	return nonseekable_open(inode, file);
+}
+
+static int wdt_close(struct inode *inode, struct file *file)
+{
+	if (expect_close == 42)
+		wdt_disable();
+	else {
+		printk(KERN_CRIT PFX
+			"Unexpected close, not stopping watchdog!\n");
+		wdt_ping();
+	}
+	expect_close = 0;
+	clear_bit(0, &wdt_is_open);
+	return 0;
+}
+
+/*
+ *	Notifier for system down
+ */
+
+static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
+	void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT)
+		wdt_disable();	/* Turn the WDT off */
+
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static const struct file_operations wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= wdt_write,
+	.unlocked_ioctl	= wdt_ioctl,
+	.open		= wdt_open,
+	.release	= wdt_close,
+};
+
+static struct miscdevice wdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &wdt_fops,
+};
+
+/*
+ *	The WDT needs to learn about soft shutdowns in order to
+ *	turn the timebomb registers off.
+ */
+
+static struct notifier_block wdt_notifier = {
+	.notifier_call = wdt_notify_sys,
+};
+
+static int __init wdt_init(void)
+{
+	int ret;
+
+	printk(KERN_INFO "WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising.\n");
+
+	if (wdt_set_heartbeat(timeout)) {
+		wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+		printk(KERN_INFO PFX
+			"timeout value must be 1<=timeout<=255, using %d\n",
+			WATCHDOG_TIMEOUT);
+	}
+
+	if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
+		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
+			wdt_io);
+		ret = -EIO;
+		goto out;
+	}
+
+	w83697ug_init();
+
+	ret = register_reboot_notifier(&wdt_notifier);
+	if (ret != 0) {
+		printk(KERN_ERR PFX
+			"cannot register reboot notifier (err=%d)\n", ret);
+		goto unreg_regions;
+	}
+
+	ret = misc_register(&wdt_miscdev);
+	if (ret != 0) {
+		printk(KERN_ERR PFX
+			"cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto unreg_reboot;
+	}
+
+	printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+		timeout, nowayout);
+
+out:
+	return ret;
+unreg_reboot:
+	unregister_reboot_notifier(&wdt_notifier);
+unreg_regions:
+	release_region(wdt_io, 1);
+	goto out;
+}
+
+static void __exit wdt_exit(void)
+{
+	misc_deregister(&wdt_miscdev);
+	unregister_reboot_notifier(&wdt_notifier);
+	release_region(wdt_io, 1);
+}
+
+module_init(wdt_init);
+module_exit(wdt_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Flemming Frandsen <ff@nrvissing.net>");
+MODULE_DESCRIPTION("w83697ug/uf WDT driver");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);