Merge git://www.linux-watchdog.org/linux-watchdog

Pull watchdog updates from Wim Van Sebroeck:
 "This includes some fixes and code improvements (like
  clk_prepare_enable and clk_disable_unprepare), conversion from the
  omap_wdt and twl4030_wdt drivers to the watchdog framework, addition
  of the SB8x0 chipset support and the DA9055 Watchdog driver and some
  OF support for the davinci_wdt driver."

* git://www.linux-watchdog.org/linux-watchdog: (22 commits)
  watchdog: mei: avoid oops in watchdog unregister code path
  watchdog: Orion: Fix possible null-deference in orion_wdt_probe
  watchdog: sp5100_tco: Add SB8x0 chipset support
  watchdog: davinci_wdt: add OF support
  watchdog: da9052: Fix invalid free of devm_ allocated data
  watchdog: twl4030_wdt: Change TWL4030_MODULE_PM_RECEIVER to TWL_MODULE_PM_RECEIVER
  watchdog: remove depends on CONFIG_EXPERIMENTAL
  watchdog: Convert dev_printk(KERN_<LEVEL> to dev_<level>(
  watchdog: DA9055 Watchdog driver
  watchdog: omap_wdt: eliminate goto
  watchdog: omap_wdt: delete redundant platform_set_drvdata() calls
  watchdog: omap_wdt: convert to devm_ functions
  watchdog: omap_wdt: convert to new watchdog core
  watchdog: WatchDog Timer Driver Core: fix comment
  watchdog: s3c2410_wdt: use clk_prepare_enable and clk_disable_unprepare
  watchdog: imx2_wdt: Select the driver via ARCH_MXC
  watchdog: cpu5wdt.c: add missing del_timer call
  watchdog: hpwdt.c: Increase version string
  watchdog: Convert twl4030_wdt to watchdog core
  davinci_wdt: preparation for switch to common clock framework
  ...

Documentation/devicetree/bindings/watchdog/davinci-wdt.txt

+DaVinci Watchdog Timer (WDT) Controller
+
+Required properties:
+- compatible : Should be "ti,davinci-wdt"
+- reg : Should contain WDT registers location and length
+
+Examples:
+
+wdt: wdt@2320000 {
+	compatible = "ti,davinci-wdt";
+	reg = <0x02320000 0x80>;
+};

drivers/misc/mei/wd.c

@@ -370,7 +370,7 @@ void mei_watchdog_register(struct mei_device *dev)
 
 void mei_watchdog_unregister(struct mei_device *dev)
 {
-	if (test_bit(WDOG_UNREGISTERED, &amt_wd_dev.status))
+	if (watchdog_get_drvdata(&amt_wd_dev) == NULL)
 		return;
 
 	watchdog_set_drvdata(&amt_wd_dev, NULL);

drivers/watchdog/Kconfig

@@ -76,6 +76,16 @@ config DA9052_WATCHDOG
           Alternatively say M to compile the driver as a module,
           which will be called da9052_wdt.
 
+config DA9055_WATCHDOG
+	tristate "Dialog Semiconductor DA9055 Watchdog"
+	depends on MFD_DA9055
+	help
+	  If you say yes here you get support for watchdog on the Dialog
+	  Semiconductor DA9055 PMIC.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called da9055_wdt.
+
 config WM831X_WATCHDOG
 	tristate "WM831x watchdog"
 	depends on MFD_WM831X
@@ -232,6 +242,7 @@ config EP93XX_WATCHDOG
 config OMAP_WATCHDOG
 	tristate "OMAP Watchdog"
 	depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS
+	select WATCHDOG_CORE
 	help
 	  Support for TI OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog.  Say 'Y'
 	  here to enable the OMAP1610/OMAP1710/OMAP2420/OMAP3430/OMAP4430 watchdog timer.
@@ -300,6 +311,7 @@ config COH901327_WATCHDOG
 config TWL4030_WATCHDOG
 	tristate "TWL4030 Watchdog"
 	depends on TWL4030_CORE
+	select WATCHDOG_CORE
 	help
 	  Support for TI TWL4030 watchdog.  Say 'Y' here to enable the
 	  watchdog timer support for TWL4030 chips.
@@ -342,7 +354,7 @@ config MAX63XX_WATCHDOG
 
 config IMX2_WDT
 	tristate "IMX2+ Watchdog"
-	depends on IMX_HAVE_PLATFORM_IMX2_WDT
+	depends on ARCH_MXC
 	help
 	  This is the driver for the hardware watchdog
 	  on the Freescale IMX2 and later processors.
@@ -431,7 +443,7 @@ config ALIM7101_WDT
 
 config F71808E_WDT
 	tristate "Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Watchdog"
-	depends on X86 && EXPERIMENTAL
+	depends on X86
 	help
 	  This is the driver for the hardware watchdog on the Fintek
 	  F71808E, F71862FG, F71869, F71882FG and F71889FG Super I/O controllers.
@@ -622,7 +634,7 @@ config IT8712F_WDT
 
 config IT87_WDT
 	tristate "IT87 Watchdog Timer"
-	depends on X86 && EXPERIMENTAL
+	depends on X86
 	---help---
 	  This is the driver for the hardware watchdog on the ITE IT8702,
 	  IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 and IT8728

drivers/watchdog/Makefile

@@ -164,6 +164,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
 
 # Architecture Independent
 obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
+obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
 obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
 obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
 obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o

drivers/watchdog/ath79_wdt.c

@@ -284,6 +284,7 @@ static void ath97_wdt_shutdown(struct platform_device *pdev)
 }
 
 static struct platform_driver ath79_wdt_driver = {
+	.probe		= ath79_wdt_probe,
 	.remove		= ath79_wdt_remove,
 	.shutdown	= ath97_wdt_shutdown,
 	.driver		= {
@@ -292,17 +293,7 @@ static struct platform_driver ath79_wdt_driver = {
 	},
 };
 
-static int __init ath79_wdt_init(void)
-{
-	return platform_driver_probe(&ath79_wdt_driver, ath79_wdt_probe);
-}
-module_init(ath79_wdt_init);
-
-static void __exit ath79_wdt_exit(void)
-{
-	platform_driver_unregister(&ath79_wdt_driver);
-}
-module_exit(ath79_wdt_exit);
+module_platform_driver(ath79_wdt_driver);
 
 MODULE_DESCRIPTION("Atheros AR71XX/AR724X/AR913X hardware watchdog driver");
 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");

drivers/watchdog/cpu5wdt.c

@@ -266,6 +266,7 @@ static void cpu5wdt_exit(void)
 	if (cpu5wdt_device.queue) {
 		cpu5wdt_device.queue = 0;
 		wait_for_completion(&cpu5wdt_device.stop);
+		del_timer(&cpu5wdt_device.timer);
 	}
 
 	misc_deregister(&cpu5wdt_misc);

drivers/watchdog/da9052_wdt.c

@@ -53,10 +53,6 @@ static const struct {
 
 static void da9052_wdt_release_resources(struct kref *r)
 {
-	struct da9052_wdt_data *driver_data =
-		container_of(r, struct da9052_wdt_data, kref);
-
-	kfree(driver_data);
 }
 
 static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,

drivers/watchdog/da9055_wdt.c

+/*
+ * System monitoring driver for DA9055 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/delay.h>
+
+#include <linux/mfd/da9055/core.h>
+#include <linux/mfd/da9055/reg.h>
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		 "Watchdog cannot be stopped once started (default="
+		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+#define DA9055_DEF_TIMEOUT	4
+#define DA9055_TWDMIN		256
+
+struct da9055_wdt_data {
+	struct watchdog_device wdt;
+	struct da9055 *da9055;
+	struct kref kref;
+};
+
+static const struct {
+	u8 reg_val;
+	int user_time;  /* In seconds */
+} da9055_wdt_maps[] = {
+	{ 0, 0 },
+	{ 1, 2 },
+	{ 2, 4 },
+	{ 3, 8 },
+	{ 4, 16 },
+	{ 5, 32 },
+	{ 5, 33 },  /* Actual time  32.768s so included both 32s and 33s */
+	{ 6, 65 },
+	{ 6, 66 },  /* Actual time 65.536s so include both, 65s and 66s */
+	{ 7, 131 },
+};
+
+static int da9055_wdt_set_timeout(struct watchdog_device *wdt_dev,
+				  unsigned int timeout)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+	struct da9055 *da9055 = driver_data->da9055;
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(da9055_wdt_maps); i++)
+		if (da9055_wdt_maps[i].user_time == timeout)
+			break;
+
+	if (i == ARRAY_SIZE(da9055_wdt_maps))
+		ret = -EINVAL;
+	else
+		ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B,
+					DA9055_TWDSCALE_MASK,
+					da9055_wdt_maps[i].reg_val <<
+					DA9055_TWDSCALE_SHIFT);
+	if (ret < 0)
+		dev_err(da9055->dev,
+			"Failed to update timescale bit, %d\n", ret);
+
+	wdt_dev->timeout = timeout;
+
+	return ret;
+}
+
+static int da9055_wdt_ping(struct watchdog_device *wdt_dev)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+	struct da9055 *da9055 = driver_data->da9055;
+	int ret;
+
+	/*
+	 * We have a minimum time for watchdog window called TWDMIN. A write
+	 * to the watchdog before this elapsed time will cause an error.
+	 */
+	mdelay(DA9055_TWDMIN);
+
+	/* Reset the watchdog timer */
+	ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_E,
+				DA9055_WATCHDOG_MASK, 1);
+
+	return ret;
+}
+
+static void da9055_wdt_release_resources(struct kref *r)
+{
+	struct da9055_wdt_data *driver_data =
+		container_of(r, struct da9055_wdt_data, kref);
+
+	kfree(driver_data);
+}
+
+static void da9055_wdt_ref(struct watchdog_device *wdt_dev)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+
+	kref_get(&driver_data->kref);
+}
+
+static void da9055_wdt_unref(struct watchdog_device *wdt_dev)
+{
+	struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+
+	kref_put(&driver_data->kref, da9055_wdt_release_resources);
+}
+
+static int da9055_wdt_start(struct watchdog_device *wdt_dev)
+{
+	return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+}
+
+static int da9055_wdt_stop(struct watchdog_device *wdt_dev)
+{
+	return da9055_wdt_set_timeout(wdt_dev, 0);
+}
+
+static struct watchdog_info da9055_wdt_info = {
+	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.identity	= "DA9055 Watchdog",
+};
+
+static const struct watchdog_ops da9055_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = da9055_wdt_start,
+	.stop = da9055_wdt_stop,
+	.ping = da9055_wdt_ping,
+	.set_timeout = da9055_wdt_set_timeout,
+	.ref = da9055_wdt_ref,
+	.unref = da9055_wdt_unref,
+};
+
+static int da9055_wdt_probe(struct platform_device *pdev)
+{
+	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
+	struct da9055_wdt_data *driver_data;
+	struct watchdog_device *da9055_wdt;
+	int ret;
+
+	driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
+				   GFP_KERNEL);
+	if (!driver_data) {
+		dev_err(da9055->dev, "Failed to allocate watchdog device\n");
+		return -ENOMEM;
+	}
+
+	driver_data->da9055 = da9055;
+
+	da9055_wdt = &driver_data->wdt;
+
+	da9055_wdt->timeout = DA9055_DEF_TIMEOUT;
+	da9055_wdt->info = &da9055_wdt_info;
+	da9055_wdt->ops = &da9055_wdt_ops;
+	watchdog_set_nowayout(da9055_wdt, nowayout);
+	watchdog_set_drvdata(da9055_wdt, driver_data);
+
+	kref_init(&driver_data->kref);
+
+	ret = da9055_wdt_stop(da9055_wdt);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to stop watchdog, %d\n", ret);
+		goto err;
+	}
+
+	dev_set_drvdata(&pdev->dev, driver_data);
+
+	ret = watchdog_register_device(&driver_data->wdt);
+	if (ret != 0)
+		dev_err(da9055->dev, "watchdog_register_device() failed: %d\n",
+			ret);
+
+err:
+	return ret;
+}
+
+static int da9055_wdt_remove(struct platform_device *pdev)
+{
+	struct da9055_wdt_data *driver_data = dev_get_drvdata(&pdev->dev);
+
+	watchdog_unregister_device(&driver_data->wdt);
+	kref_put(&driver_data->kref, da9055_wdt_release_resources);
+
+	return 0;
+}
+
+static struct platform_driver da9055_wdt_driver = {
+	.probe = da9055_wdt_probe,
+	.remove = da9055_wdt_remove,
+	.driver = {
+		.name	= "da9055-watchdog",
+	},
+};
+
+module_platform_driver(da9055_wdt_driver);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("DA9055 watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9055-watchdog");

drivers/watchdog/davinci_wdt.c

@@ -208,7 +208,7 @@ static int davinci_wdt_probe(struct platform_device *pdev)
 	if (WARN_ON(IS_ERR(wdt_clk)))
 		return PTR_ERR(wdt_clk);
 
-	clk_enable(wdt_clk);
+	clk_prepare_enable(wdt_clk);
 
 	if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
 		heartbeat = DEFAULT_HEARTBEAT;
@@ -256,16 +256,23 @@ static int davinci_wdt_remove(struct platform_device *pdev)
 		wdt_mem = NULL;
 	}
 
-	clk_disable(wdt_clk);
+	clk_disable_unprepare(wdt_clk);
 	clk_put(wdt_clk);
 
 	return 0;
 }
 
+static const struct of_device_id davinci_wdt_of_match[] = {
+	{ .compatible = "ti,davinci-wdt", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, davinci_wdt_of_match);
+
 static struct platform_driver platform_wdt_driver = {
 	.driver = {
 		.name = "watchdog",
 		.owner	= THIS_MODULE,
+		.of_match_table = davinci_wdt_of_match,
 	},
 	.probe = davinci_wdt_probe,
 	.remove = davinci_wdt_remove,

drivers/watchdog/hpwdt.c

@@ -39,7 +39,7 @@
 #endif /* CONFIG_HPWDT_NMI_DECODING */
 #include <asm/nmi.h>
 
-#define HPWDT_VERSION			"1.3.0"
+#define HPWDT_VERSION			"1.3.1"
 #define SECS_TO_TICKS(secs)		((secs) * 1000 / 128)
 #define TICKS_TO_SECS(ticks)		((ticks) * 128 / 1000)
 #define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)

drivers/watchdog/mpcore_wdt.c

@@ -80,8 +80,7 @@ static irqreturn_t mpcore_wdt_fire(int irq, void *arg)
 
 	/* Check it really was our interrupt */
 	if (readl(wdt->base + TWD_WDOG_INTSTAT)) {
-		dev_printk(KERN_CRIT, wdt->dev,
-					"Triggered - Reboot ignored.\n");
+		dev_crit(wdt->dev, "Triggered - Reboot ignored\n");
 		/* Clear the interrupt on the watchdog */
 		writel(1, wdt->base + TWD_WDOG_INTSTAT);
 		return IRQ_HANDLED;
@@ -123,7 +122,7 @@ static void mpcore_wdt_stop(struct mpcore_wdt *wdt)
 
 static void mpcore_wdt_start(struct mpcore_wdt *wdt)
 {
-	dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n");
+	dev_info(wdt->dev, "enabling watchdog\n");
 
 	/* This loads the count register but does NOT start the count yet */
 	mpcore_wdt_keepalive(wdt);
@@ -180,7 +179,7 @@ static int mpcore_wdt_release(struct inode *inode, struct file *file)
 	if (wdt->expect_close == 42)
 		mpcore_wdt_stop(wdt);
 	else {
-		dev_printk(KERN_CRIT, wdt->dev,
+		dev_crit(wdt->dev,
 			 "unexpected close, not stopping watchdog!\n");
 		mpcore_wdt_keepalive(wdt);
 	}
@@ -351,7 +350,7 @@ static int mpcore_wdt_probe(struct platform_device *pdev)
 		ret = devm_request_irq(wdt->dev, wdt->irq, mpcore_wdt_fire, 0,
 				"mpcore_wdt", wdt);
 		if (ret) {
-			dev_printk(KERN_ERR, wdt->dev,
+			dev_err(wdt->dev,
 				"cannot register IRQ%d for watchdog\n",
 				wdt->irq);
 			return ret;
@@ -365,7 +364,7 @@ static int mpcore_wdt_probe(struct platform_device *pdev)
 	mpcore_wdt_miscdev.parent = &pdev->dev;
 	ret = misc_register(&mpcore_wdt_miscdev);
 	if (ret) {
-		dev_printk(KERN_ERR, wdt->dev,
+		dev_err(wdt->dev,
 			"cannot register miscdev on minor=%d (err=%d)\n",
 			WATCHDOG_MINOR, ret);
 		return ret;

drivers/watchdog/omap_wdt.c

@@ -31,42 +31,34 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
-#include <linux/fs.h>
 #include <linux/mm.h>
-#include <linux/miscdevice.h>
 #include <linux/watchdog.h>
 #include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/platform_device.h>
 #include <linux/moduleparam.h>
-#include <linux/bitops.h>
 #include <linux/io.h>
-#include <linux/uaccess.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_data/omap-wd-timer.h>
 
 #include "omap_wdt.h"
 
-static struct platform_device *omap_wdt_dev;
-
 static unsigned timer_margin;
 module_param(timer_margin, uint, 0);
 MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
 
-static unsigned int wdt_trgr_pattern = 0x1234;
-static DEFINE_SPINLOCK(wdt_lock);
-
 struct omap_wdt_dev {
 	void __iomem    *base;          /* physical */
 	struct device   *dev;
-	int             omap_wdt_users;
+	bool		omap_wdt_users;
 	struct resource *mem;
-	struct miscdevice omap_wdt_miscdev;
+	int		wdt_trgr_pattern;
+	struct mutex	lock;		/* to avoid races with PM */
 };
 
-static void omap_wdt_ping(struct omap_wdt_dev *wdev)
+static void omap_wdt_reload(struct omap_wdt_dev *wdev)
 {
 	void __iomem    *base = wdev->base;
 
@@ -74,8 +66,8 @@ static void omap_wdt_ping(struct omap_wdt_dev *wdev)
 	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
 		cpu_relax();
 
-	wdt_trgr_pattern = ~wdt_trgr_pattern;
-	__raw_writel(wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
+	wdev->wdt_trgr_pattern = ~wdev->wdt_trgr_pattern;
+	__raw_writel(wdev->wdt_trgr_pattern, (base + OMAP_WATCHDOG_TGR));
 
 	/* wait for posted write to complete */
 	while ((__raw_readl(base + OMAP_WATCHDOG_WPS)) & 0x08)
@@ -111,18 +103,10 @@ static void omap_wdt_disable(struct omap_wdt_dev *wdev)
 		cpu_relax();
 }
 
-static void omap_wdt_adjust_timeout(unsigned new_timeout)
-{
-	if (new_timeout < TIMER_MARGIN_MIN)
-		new_timeout = TIMER_MARGIN_DEFAULT;
-	if (new_timeout > TIMER_MARGIN_MAX)
-		new_timeout = TIMER_MARGIN_MAX;
-	timer_margin = new_timeout;
-}
-
-static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
+static void omap_wdt_set_timer(struct omap_wdt_dev *wdev,
+				   unsigned int timeout)
 {
-	u32 pre_margin = GET_WLDR_VAL(timer_margin);
+	u32 pre_margin = GET_WLDR_VAL(timeout);
 	void __iomem *base = wdev->base;
 
 	/* just count up at 32 KHz */
@@ -134,16 +118,14 @@ static void omap_wdt_set_timeout(struct omap_wdt_dev *wdev)
 		cpu_relax();
 }
 
-/*
- *	Allow only one task to hold it open
- */
-static int omap_wdt_open(struct inode *inode, struct file *file)
+static int omap_wdt_start(struct watchdog_device *wdog)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(omap_wdt_dev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 	void __iomem *base = wdev->base;
 
-	if (test_and_set_bit(1, (unsigned long *)&(wdev->omap_wdt_users)))
-		return -EBUSY;
+	mutex_lock(&wdev->lock);
+
+	wdev->omap_wdt_users = true;
 
 	pm_runtime_get_sync(wdev->dev);
 
@@ -155,223 +137,169 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
 	while (__raw_readl(base + OMAP_WATCHDOG_WPS) & 0x01)
 		cpu_relax();
 
-	file->private_data = (void *) wdev;
-
-	omap_wdt_set_timeout(wdev);
-	omap_wdt_ping(wdev); /* trigger loading of new timeout value */
+	omap_wdt_set_timer(wdev, wdog->timeout);
+	omap_wdt_reload(wdev); /* trigger loading of new timeout value */
 	omap_wdt_enable(wdev);
 
-	return nonseekable_open(inode, file);
+	mutex_unlock(&wdev->lock);
+
+	return 0;
 }
 
-static int omap_wdt_release(struct inode *inode, struct file *file)
+static int omap_wdt_stop(struct watchdog_device *wdog)
 {
-	struct omap_wdt_dev *wdev = file->private_data;
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
-	/*
-	 *      Shut off the timer unless NOWAYOUT is defined.
-	 */
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	mutex_lock(&wdev->lock);
 	omap_wdt_disable(wdev);
-
 	pm_runtime_put_sync(wdev->dev);
-#else
-	pr_crit("Unexpected close, not stopping!\n");
-#endif
-	wdev->omap_wdt_users = 0;
-
+	wdev->omap_wdt_users = false;
+	mutex_unlock(&wdev->lock);
 	return 0;
 }
 
-static ssize_t omap_wdt_write(struct file *file, const char __user *data,
-		size_t len, loff_t *ppos)
+static int omap_wdt_ping(struct watchdog_device *wdog)
 {
-	struct omap_wdt_dev *wdev = file->private_data;
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
-	/* Refresh LOAD_TIME. */
-	if (len) {
-		spin_lock(&wdt_lock);
-		omap_wdt_ping(wdev);
-		spin_unlock(&wdt_lock);
-	}
-	return len;
+	mutex_lock(&wdev->lock);
+	omap_wdt_reload(wdev);
+	mutex_unlock(&wdev->lock);
+
+	return 0;
 }
 
-static long omap_wdt_ioctl(struct file *file, unsigned int cmd,
-						unsigned long arg)
+static int omap_wdt_set_timeout(struct watchdog_device *wdog,
+				unsigned int timeout)
 {
-	struct omap_wd_timer_platform_data *pdata;
-	struct omap_wdt_dev *wdev;
-	u32 rs;
-	int new_margin, bs;
-	static const struct watchdog_info ident = {
-		.identity = "OMAP Watchdog",
-		.options = WDIOF_SETTIMEOUT,
-		.firmware_version = 0,
-	};
-
-	wdev = file->private_data;
-	pdata = wdev->dev->platform_data;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user((struct watchdog_info __user *)arg, &ident,
-				sizeof(ident));
-	case WDIOC_GETSTATUS:
-		return put_user(0, (int __user *)arg);
-	case WDIOC_GETBOOTSTATUS:
-		if (!pdata || !pdata->read_reset_sources)
-			return put_user(0, (int __user *)arg);
-		rs = pdata->read_reset_sources();
-		bs = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
-			WDIOF_CARDRESET : 0;
-		return put_user(bs, (int __user *)arg);
-	case WDIOC_KEEPALIVE:
-		spin_lock(&wdt_lock);
-		omap_wdt_ping(wdev);
-		spin_unlock(&wdt_lock);
-		return 0;
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_margin, (int __user *)arg))
-			return -EFAULT;
-		omap_wdt_adjust_timeout(new_margin);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
-		spin_lock(&wdt_lock);
+	mutex_lock(&wdev->lock);
 	omap_wdt_disable(wdev);
-		omap_wdt_set_timeout(wdev);
+	omap_wdt_set_timer(wdev, timeout);
 	omap_wdt_enable(wdev);
+	omap_wdt_reload(wdev);
+	wdog->timeout = timeout;
+	mutex_unlock(&wdev->lock);
 
-		omap_wdt_ping(wdev);
-		spin_unlock(&wdt_lock);
-		/* Fall */
-	case WDIOC_GETTIMEOUT:
-		return put_user(timer_margin, (int __user *)arg);
-	default:
-		return -ENOTTY;
-	}
+	return 0;
 }
 
-static const struct file_operations omap_wdt_fops = {
+static const struct watchdog_info omap_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.identity = "OMAP Watchdog",
+};
+
+static const struct watchdog_ops omap_wdt_ops = {
 	.owner		= THIS_MODULE,
-	.write = omap_wdt_write,
-	.unlocked_ioctl = omap_wdt_ioctl,
-	.open = omap_wdt_open,
-	.release = omap_wdt_release,
-	.llseek = no_llseek,
+	.start		= omap_wdt_start,
+	.stop		= omap_wdt_stop,
+	.ping		= omap_wdt_ping,
+	.set_timeout	= omap_wdt_set_timeout,
 };
 
 static int omap_wdt_probe(struct platform_device *pdev)
 {
+	struct omap_wd_timer_platform_data *pdata = pdev->dev.platform_data;
+	bool nowayout = WATCHDOG_NOWAYOUT;
+	struct watchdog_device *omap_wdt;
 	struct resource *res, *mem;
 	struct omap_wdt_dev *wdev;
+	u32 rs;
 	int ret;
 
+	omap_wdt = devm_kzalloc(&pdev->dev, sizeof(*omap_wdt), GFP_KERNEL);
+	if (!omap_wdt)
+		return -ENOMEM;
+
 	/* reserve static register mappings */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		ret = -ENOENT;
-		goto err_get_resource;
-	}
-
-	if (omap_wdt_dev) {
-		ret = -EBUSY;
-		goto err_busy;
-	}
+	if (!res)
+		return -ENOENT;
 
-	mem = request_mem_region(res->start, resource_size(res), pdev->name);
-	if (!mem) {
-		ret = -EBUSY;
-		goto err_busy;
-	}
+	mem = devm_request_mem_region(&pdev->dev, res->start,
+				      resource_size(res), pdev->name);
+	if (!mem)
+		return -EBUSY;
 
-	wdev = kzalloc(sizeof(struct omap_wdt_dev), GFP_KERNEL);
-	if (!wdev) {
-		ret = -ENOMEM;
-		goto err_kzalloc;
-	}
+	wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
+	if (!wdev)
+		return -ENOMEM;
 
-	wdev->omap_wdt_users = 0;
+	wdev->omap_wdt_users	= false;
 	wdev->mem		= mem;
 	wdev->dev		= &pdev->dev;
+	wdev->wdt_trgr_pattern	= 0x1234;
+	mutex_init(&wdev->lock);
 
-	wdev->base = ioremap(res->start, resource_size(res));
-	if (!wdev->base) {
-		ret = -ENOMEM;
-		goto err_ioremap;
-	}
+	wdev->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!wdev->base)
+		return -ENOMEM;
+
+	omap_wdt->info	      = &omap_wdt_info;
+	omap_wdt->ops	      = &omap_wdt_ops;
+	omap_wdt->min_timeout = TIMER_MARGIN_MIN;
+	omap_wdt->max_timeout = TIMER_MARGIN_MAX;
+
+	if (timer_margin >= TIMER_MARGIN_MIN &&
+	    timer_margin <= TIMER_MARGIN_MAX)
+		omap_wdt->timeout = timer_margin;
+	else
+		omap_wdt->timeout = TIMER_MARGIN_DEFAULT;
+
+	watchdog_set_drvdata(omap_wdt, wdev);
+	watchdog_set_nowayout(omap_wdt, nowayout);
 
-	platform_set_drvdata(pdev, wdev);
+	platform_set_drvdata(pdev, omap_wdt);
 
 	pm_runtime_enable(wdev->dev);
 	pm_runtime_get_sync(wdev->dev);
 
-	omap_wdt_disable(wdev);
-	omap_wdt_adjust_timeout(timer_margin);
+	if (pdata && pdata->read_reset_sources)
+		rs = pdata->read_reset_sources();
+	else
+		rs = 0;
+	omap_wdt->bootstatus = (rs & (1 << OMAP_MPU_WD_RST_SRC_ID_SHIFT)) ?
+				WDIOF_CARDRESET : 0;
 
-	wdev->omap_wdt_miscdev.parent = &pdev->dev;
-	wdev->omap_wdt_miscdev.minor = WATCHDOG_MINOR;
-	wdev->omap_wdt_miscdev.name = "watchdog";
-	wdev->omap_wdt_miscdev.fops = &omap_wdt_fops;
+	omap_wdt_disable(wdev);
 
-	ret = misc_register(&(wdev->omap_wdt_miscdev));
-	if (ret)
-		goto err_misc;
+	ret = watchdog_register_device(omap_wdt);
+	if (ret) {
+		pm_runtime_disable(wdev->dev);
+		return ret;
+	}
 
 	pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n",
 		__raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
-		timer_margin);
+		omap_wdt->timeout);
 
 	pm_runtime_put_sync(wdev->dev);
 
-	omap_wdt_dev = pdev;
-
 	return 0;
-
-err_misc:
-	pm_runtime_disable(wdev->dev);
-	platform_set_drvdata(pdev, NULL);
-	iounmap(wdev->base);
-
-err_ioremap:
-	wdev->base = NULL;
-	kfree(wdev);
-
-err_kzalloc:
-	release_mem_region(res->start, resource_size(res));
-
-err_busy:
-err_get_resource:
-
-	return ret;
 }
 
 static void omap_wdt_shutdown(struct platform_device *pdev)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct watchdog_device *wdog = platform_get_drvdata(pdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
+	mutex_lock(&wdev->lock);
 	if (wdev->omap_wdt_users) {
 		omap_wdt_disable(wdev);
 		pm_runtime_put_sync(wdev->dev);
 	}
+	mutex_unlock(&wdev->lock);
 }
 
 static int omap_wdt_remove(struct platform_device *pdev)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct watchdog_device *wdog = platform_get_drvdata(pdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
 	pm_runtime_disable(wdev->dev);
-	if (!res)
-		return -ENOENT;
-
-	misc_deregister(&(wdev->omap_wdt_miscdev));
-	release_mem_region(res->start, resource_size(res));
-	platform_set_drvdata(pdev, NULL);
-
-	iounmap(wdev->base);
-
-	kfree(wdev);
-	omap_wdt_dev = NULL;
+	watchdog_unregister_device(wdog);
 
 	return 0;
 }
@@ -386,25 +314,31 @@ static int omap_wdt_remove(struct platform_device *pdev)
 
 static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct watchdog_device *wdog = platform_get_drvdata(pdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
+	mutex_lock(&wdev->lock);
 	if (wdev->omap_wdt_users) {
 		omap_wdt_disable(wdev);
 		pm_runtime_put_sync(wdev->dev);
 	}
+	mutex_unlock(&wdev->lock);
 
 	return 0;
 }
 
 static int omap_wdt_resume(struct platform_device *pdev)
 {
-	struct omap_wdt_dev *wdev = platform_get_drvdata(pdev);
+	struct watchdog_device *wdog = platform_get_drvdata(pdev);
+	struct omap_wdt_dev *wdev = watchdog_get_drvdata(wdog);
 
+	mutex_lock(&wdev->lock);
 	if (wdev->omap_wdt_users) {
 		pm_runtime_get_sync(wdev->dev);
 		omap_wdt_enable(wdev);
-		omap_wdt_ping(wdev);
+		omap_wdt_reload(wdev);
 	}
+	mutex_unlock(&wdev->lock);
 
 	return 0;
 }
@@ -437,5 +371,4 @@ module_platform_driver(omap_wdt_driver);
 
 MODULE_AUTHOR("George G. Davis");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 MODULE_ALIAS("platform:omap_wdt");

drivers/watchdog/orion_wdt.c

@@ -156,6 +156,8 @@ static int orion_wdt_probe(struct platform_device *pdev)
 	wdt_tclk = clk_get_rate(clk);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENODEV;
 	wdt_reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 	if (!wdt_reg)
 		return -ENOMEM;

drivers/watchdog/s3c2410_wdt.c

@@ -354,7 +354,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 		goto err_map;
 	}
 
-	clk_enable(wdt_clock);
+	clk_prepare_enable(wdt_clock);
 
 	ret = s3c2410wdt_cpufreq_register();
 	if (ret < 0) {
@@ -421,7 +421,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
 	s3c2410wdt_cpufreq_deregister();
 
  err_clk:
-	clk_disable(wdt_clock);
+	clk_disable_unprepare(wdt_clock);
 	clk_put(wdt_clock);
 	wdt_clock = NULL;
 
@@ -445,7 +445,7 @@ static int s3c2410wdt_remove(struct platform_device *dev)
 
 	s3c2410wdt_cpufreq_deregister();
 
-	clk_disable(wdt_clock);
+	clk_disable_unprepare(wdt_clock);
 	clk_put(wdt_clock);
 	wdt_clock = NULL;
 

drivers/watchdog/sp5100_tco.c

@@ -13,7 +13,9 @@
  *	as published by the Free Software Foundation; either version
  *	2 of the License, or (at your option) any later version.
  *
- *	See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide"
+ *	See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
+ *	    AMD Publication 45482 "AMD SB800-Series Southbridges Register
+ *	                                                      Reference Guide"
  */
 
 /*
@@ -38,18 +40,24 @@
 #include "sp5100_tco.h"
 
 /* Module and version information */
-#define TCO_VERSION "0.01"
+#define TCO_VERSION "0.03"
 #define TCO_MODULE_NAME "SP5100 TCO timer"
 #define TCO_DRIVER_NAME   TCO_MODULE_NAME ", v" TCO_VERSION
 
 /* internal variables */
 static u32 tcobase_phys;
+static u32 resbase_phys;
+static u32 tco_wdt_fired;
 static void __iomem *tcobase;
 static unsigned int pm_iobase;
 static DEFINE_SPINLOCK(tco_lock);	/* Guards the hardware */
 static unsigned long timer_alive;
 static char tco_expect_close;
 static struct pci_dev *sp5100_tco_pci;
+static struct resource wdt_res = {
+	.name = "Watchdog Timer",
+	.flags = IORESOURCE_MEM,
+};
 
 /* the watchdog platform device */
 static struct platform_device *sp5100_tco_platform_device;
@@ -64,9 +72,15 @@ MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, bool, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started."
 		" (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
+static unsigned int force_addr;
+module_param(force_addr, uint, 0);
+MODULE_PARM_DESC(force_addr, "Force the use of specified MMIO address."
+		" ONLY USE THIS PARAMETER IF YOU REALLY KNOW"
+		" WHAT YOU ARE DOING (default=none)");
+
 /*
  * Some TCO specific functions
  */
@@ -122,6 +136,79 @@ static int tco_timer_set_heartbeat(int t)
 	return 0;
 }
 
+static void tco_timer_enable(void)
+{
+	int val;
+
+	if (sp5100_tco_pci->revision >= 0x40) {
+		/* For SB800 or later */
+		/* Set the Watchdog timer resolution to 1 sec */
+		outb(SB800_PM_WATCHDOG_CONFIG, SB800_IO_PM_INDEX_REG);
+		val = inb(SB800_IO_PM_DATA_REG);
+		val |= SB800_PM_WATCHDOG_SECOND_RES;
+		outb(val, SB800_IO_PM_DATA_REG);
+
+		/* Enable watchdog decode bit and watchdog timer */
+		outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
+		val = inb(SB800_IO_PM_DATA_REG);
+		val |= SB800_PCI_WATCHDOG_DECODE_EN;
+		val &= ~SB800_PM_WATCHDOG_DISABLE;
+		outb(val, SB800_IO_PM_DATA_REG);
+	} else {
+		/* For SP5100 or SB7x0 */
+		/* Enable watchdog decode bit */
+		pci_read_config_dword(sp5100_tco_pci,
+				      SP5100_PCI_WATCHDOG_MISC_REG,
+				      &val);
+
+		val |= SP5100_PCI_WATCHDOG_DECODE_EN;
+
+		pci_write_config_dword(sp5100_tco_pci,
+				       SP5100_PCI_WATCHDOG_MISC_REG,
+				       val);
+
+		/* Enable Watchdog timer and set the resolution to 1 sec */
+		outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
+		val = inb(SP5100_IO_PM_DATA_REG);
+		val |= SP5100_PM_WATCHDOG_SECOND_RES;
+		val &= ~SP5100_PM_WATCHDOG_DISABLE;
+		outb(val, SP5100_IO_PM_DATA_REG);
+	}
+}
+
+static void tco_timer_disable(void)
+{
+	int val;
+
+	if (sp5100_tco_pci->revision >= 0x40) {
+		/* For SB800 or later */
+		/* Enable watchdog decode bit and Disable watchdog timer */
+		outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
+		val = inb(SB800_IO_PM_DATA_REG);
+		val |= SB800_PCI_WATCHDOG_DECODE_EN;
+		val |= SB800_PM_WATCHDOG_DISABLE;
+		outb(val, SB800_IO_PM_DATA_REG);
+	} else {
+		/* For SP5100 or SB7x0 */
+		/* Enable watchdog decode bit */
+		pci_read_config_dword(sp5100_tco_pci,
+				      SP5100_PCI_WATCHDOG_MISC_REG,
+				      &val);
+
+		val |= SP5100_PCI_WATCHDOG_DECODE_EN;
+
+		pci_write_config_dword(sp5100_tco_pci,
+				       SP5100_PCI_WATCHDOG_MISC_REG,
+				       val);
+
+		/* Disable Watchdog timer */
+		outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
+		val = inb(SP5100_IO_PM_DATA_REG);
+		val |= SP5100_PM_WATCHDOG_DISABLE;
+		outb(val, SP5100_IO_PM_DATA_REG);
+	}
+}
+
 /*
  *	/dev/watchdog handling
  */
@@ -270,11 +357,12 @@ MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
 /*
  * Init & exit routines
  */
-
 static unsigned char sp5100_tco_setupdevice(void)
 {
 	struct pci_dev *dev = NULL;
+	const char *dev_name = NULL;
 	u32 val;
+	u32 index_reg, data_reg, base_addr;
 
 	/* Match the PCI device */
 	for_each_pci_dev(dev) {
@@ -287,29 +375,160 @@ static unsigned char sp5100_tco_setupdevice(void)
 	if (!sp5100_tco_pci)
 		return 0;
 
+	pr_info("PCI Revision ID: 0x%x\n", sp5100_tco_pci->revision);
+
+	/*
+	 * Determine type of southbridge chipset.
+	 */
+	if (sp5100_tco_pci->revision >= 0x40) {
+		dev_name = SB800_DEVNAME;
+		index_reg = SB800_IO_PM_INDEX_REG;
+		data_reg = SB800_IO_PM_DATA_REG;
+		base_addr = SB800_PM_WATCHDOG_BASE;
+	} else {
+		dev_name = SP5100_DEVNAME;
+		index_reg = SP5100_IO_PM_INDEX_REG;
+		data_reg = SP5100_IO_PM_DATA_REG;
+		base_addr = SP5100_PM_WATCHDOG_BASE;
+	}
+
 	/* Request the IO ports used by this driver */
 	pm_iobase = SP5100_IO_PM_INDEX_REG;
-	if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, "SP5100 TCO")) {
+	if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, dev_name)) {
 		pr_err("I/O address 0x%04x already in use\n", pm_iobase);
 		goto exit;
 	}
 
-	/* Find the watchdog base address. */
-	outb(SP5100_PM_WATCHDOG_BASE3, SP5100_IO_PM_INDEX_REG);
-	val = inb(SP5100_IO_PM_DATA_REG);
-	outb(SP5100_PM_WATCHDOG_BASE2, SP5100_IO_PM_INDEX_REG);
-	val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
-	outb(SP5100_PM_WATCHDOG_BASE1, SP5100_IO_PM_INDEX_REG);
-	val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
-	outb(SP5100_PM_WATCHDOG_BASE0, SP5100_IO_PM_INDEX_REG);
-	/* Low three bits of BASE0 are reserved. */
-	val = val << 8 | (inb(SP5100_IO_PM_DATA_REG) & 0xf8);
+	/*
+	 * First, Find the watchdog timer MMIO address from indirect I/O.
+	 */
+	outb(base_addr+3, index_reg);
+	val = inb(data_reg);
+	outb(base_addr+2, index_reg);
+	val = val << 8 | inb(data_reg);
+	outb(base_addr+1, index_reg);
+	val = val << 8 | inb(data_reg);
+	outb(base_addr+0, index_reg);
+	/* Low three bits of BASE are reserved */
+	val = val << 8 | (inb(data_reg) & 0xf8);
+
+	pr_debug("Got 0x%04x from indirect I/O\n", val);
+
+	/* Check MMIO address conflict */
+	if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
+								dev_name))
+		goto setup_wdt;
+	else
+		pr_debug("MMIO address 0x%04x already in use\n", val);
 
-	if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
-								"SP5100 TCO")) {
-		pr_err("mmio address 0x%04x already in use\n", val);
+	/*
+	 * Secondly, Find the watchdog timer MMIO address
+	 * from SBResource_MMIO register.
+	 */
+	if (sp5100_tco_pci->revision >= 0x40) {
+		/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
+		outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
+		val = inb(SB800_IO_PM_DATA_REG);
+		outb(SB800_PM_ACPI_MMIO_EN+2, SB800_IO_PM_INDEX_REG);
+		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
+		outb(SB800_PM_ACPI_MMIO_EN+1, SB800_IO_PM_INDEX_REG);
+		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
+		outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
+		val = val << 8 | inb(SB800_IO_PM_DATA_REG);
+	} else {
+		/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
+		pci_read_config_dword(sp5100_tco_pci,
+				      SP5100_SB_RESOURCE_MMIO_BASE, &val);
+	}
+
+	/* The SBResource_MMIO is enabled and mapped memory space? */
+	if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) ==
+						  SB800_ACPI_MMIO_DECODE_EN) {
+		/* Clear unnecessary the low twelve bits */
+		val &= ~0xFFF;
+		/* Add the Watchdog Timer offset to base address. */
+		val += SB800_PM_WDT_MMIO_OFFSET;
+		/* Check MMIO address conflict */
+		if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
+								   dev_name)) {
+			pr_debug("Got 0x%04x from SBResource_MMIO register\n",
+				val);
+			goto setup_wdt;
+		} else
+			pr_debug("MMIO address 0x%04x already in use\n", val);
+	} else
+		pr_debug("SBResource_MMIO is disabled(0x%04x)\n", val);
+
+	/*
+	 * Lastly re-programming the watchdog timer MMIO address,
+	 * This method is a last resort...
+	 *
+	 * Before re-programming, to ensure that the watchdog timer
+	 * is disabled, disable the watchdog timer.
+	 */
+	tco_timer_disable();
+
+	if (force_addr) {
+		/*
+		 * Force the use of watchdog timer MMIO address, and aligned to
+		 * 8byte boundary.
+		 */
+		force_addr &= ~0x7;
+		val = force_addr;
+
+		pr_info("Force the use of 0x%04x as MMIO address\n", val);
+	} else {
+		/*
+		 * Get empty slot into the resource tree for watchdog timer.
+		 */
+		if (allocate_resource(&iomem_resource,
+				      &wdt_res,
+				      SP5100_WDT_MEM_MAP_SIZE,
+				      0xf0000000,
+				      0xfffffff8,
+				      0x8,
+				      NULL,
+				      NULL)) {
+			pr_err("MMIO allocation failed\n");
 			goto unreg_region;
 		}
+
+		val = resbase_phys = wdt_res.start;
+		pr_debug("Got 0x%04x from resource tree\n", val);
+	}
+
+	/* Restore to the low three bits, if chipset is SB8x0(or later) */
+	if (sp5100_tco_pci->revision >= 0x40) {
+		u8 reserved_bit;
+		reserved_bit = inb(base_addr) & 0x7;
+		val |= (u32)reserved_bit;
+	}
+
+	/* Re-programming the watchdog timer base address */
+	outb(base_addr+0, index_reg);
+	/* Low three bits of BASE are reserved */
+	outb((val >>  0) & 0xf8, data_reg);
+	outb(base_addr+1, index_reg);
+	outb((val >>  8) & 0xff, data_reg);
+	outb(base_addr+2, index_reg);
+	outb((val >> 16) & 0xff, data_reg);
+	outb(base_addr+3, index_reg);
+	outb((val >> 24) & 0xff, data_reg);
+
+	/*
+	 * Clear unnecessary the low three bits,
+	 * if chipset is SB8x0(or later)
+	 */
+	if (sp5100_tco_pci->revision >= 0x40)
+		val &= ~0x7;
+
+	if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
+								   dev_name)) {
+		pr_err("MMIO address 0x%04x already in use\n", val);
+		goto unreg_resource;
+	}
+
+setup_wdt:
 	tcobase_phys = val;
 
 	tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
@@ -318,26 +537,18 @@ static unsigned char sp5100_tco_setupdevice(void)
 		goto unreg_mem_region;
 	}
 
-	/* Enable watchdog decode bit */
-	pci_read_config_dword(sp5100_tco_pci,
-			      SP5100_PCI_WATCHDOG_MISC_REG,
-			      &val);
-
-	val |= SP5100_PCI_WATCHDOG_DECODE_EN;
-
-	pci_write_config_dword(sp5100_tco_pci,
-			       SP5100_PCI_WATCHDOG_MISC_REG,
-			       val);
+	pr_info("Using 0x%04x for watchdog MMIO address\n", val);
 
-	/* Enable Watchdog timer and set the resolution to 1 sec. */
-	outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
-	val = inb(SP5100_IO_PM_DATA_REG);
-	val |= SP5100_PM_WATCHDOG_SECOND_RES;
-	val &= ~SP5100_PM_WATCHDOG_DISABLE;
-	outb(val, SP5100_IO_PM_DATA_REG);
+	/* Setup the watchdog timer */
+	tco_timer_enable();
 
-	/* Check that the watchdog action is set to reset the system. */
+	/* Check that the watchdog action is set to reset the system */
 	val = readl(SP5100_WDT_CONTROL(tcobase));
+	/*
+	 * Save WatchDogFired status, because WatchDogFired flag is
+	 * cleared here.
+	 */
+	tco_wdt_fired = val & SP5100_PM_WATCHDOG_FIRED;
 	val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
 	writel(val, SP5100_WDT_CONTROL(tcobase));
 
@@ -355,6 +566,9 @@ static unsigned char sp5100_tco_setupdevice(void)
 
 unreg_mem_region:
 	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
+unreg_resource:
+	if (resbase_phys)
+		release_resource(&wdt_res);
 unreg_region:
 	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
 exit:
@@ -364,23 +578,18 @@ static unsigned char sp5100_tco_setupdevice(void)
 static int sp5100_tco_init(struct platform_device *dev)
 {
 	int ret;
-	u32 val;
+	char addr_str[16];
 
-	/* Check whether or not the hardware watchdog is there. If found, then
+	/*
+	 * Check whether or not the hardware watchdog is there. If found, then
 	 * set it up.
 	 */
 	if (!sp5100_tco_setupdevice())
 		return -ENODEV;
 
 	/* Check to see if last reboot was due to watchdog timeout */
-	pr_info("Watchdog reboot %sdetected\n",
-		readl(SP5100_WDT_CONTROL(tcobase)) & SP5100_PM_WATCHDOG_FIRED ?
-		"" : "not ");
-
-	/* Clear out the old status */
-	val = readl(SP5100_WDT_CONTROL(tcobase));
-	val &= ~SP5100_PM_WATCHDOG_FIRED;
-	writel(val, SP5100_WDT_CONTROL(tcobase));
+	pr_info("Last reboot was %striggered by watchdog.\n",
+		tco_wdt_fired ? "" : "not ");
 
 	/*
 	 * Check that the heartbeat value is within it's range.
@@ -400,14 +609,24 @@ static int sp5100_tco_init(struct platform_device *dev)
 
 	clear_bit(0, &timer_alive);
 
-	pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
-		tcobase, heartbeat, nowayout);
+	/* Show module parameters */
+	if (force_addr == tcobase_phys)
+		/* The force_addr is vaild */
+		sprintf(addr_str, "0x%04x", force_addr);
+	else
+		strcpy(addr_str, "none");
+
+	pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d, "
+		"force_addr=%s)\n",
+		tcobase, heartbeat, nowayout, addr_str);
 
 	return 0;
 
 exit:
 	iounmap(tcobase);
 	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
+	if (resbase_phys)
+		release_resource(&wdt_res);
 	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
 	return ret;
 }
@@ -422,6 +641,8 @@ static void sp5100_tco_cleanup(void)
 	misc_deregister(&sp5100_tco_miscdev);
 	iounmap(tcobase);
 	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
+	if (resbase_phys)
+		release_resource(&wdt_res);
 	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
 }
 
@@ -451,7 +672,7 @@ static int __init sp5100_tco_init_module(void)
 {
 	int err;
 
-	pr_info("SP5100 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
+	pr_info("SP5100/SB800 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
 
 	err = platform_driver_register(&sp5100_tco_driver);
 	if (err)
@@ -475,13 +696,13 @@ static void __exit sp5100_tco_cleanup_module(void)
 {
 	platform_device_unregister(sp5100_tco_platform_device);
 	platform_driver_unregister(&sp5100_tco_driver);
-	pr_info("SP5100 TCO Watchdog Module Unloaded\n");
+	pr_info("SP5100/SB800 TCO Watchdog Module Unloaded\n");
 }
 
 module_init(sp5100_tco_init_module);
 module_exit(sp5100_tco_cleanup_module);
 
 MODULE_AUTHOR("Priyanka Gupta");
-MODULE_DESCRIPTION("TCO timer driver for SP5100 chipset");
+MODULE_DESCRIPTION("TCO timer driver for SP5100/SB800 chipset");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/watchdog/sp5100_tco.h

@@ -9,33 +9,57 @@
 /*
  * Some address definitions for the Watchdog
  */
-
 #define SP5100_WDT_MEM_MAP_SIZE		0x08
 #define SP5100_WDT_CONTROL(base)	((base) + 0x00) /* Watchdog Control */
 #define SP5100_WDT_COUNT(base)		((base) + 0x04) /* Watchdog Count */
 
-#define SP5100_WDT_START_STOP_BIT	1
+#define SP5100_WDT_START_STOP_BIT	(1 << 0)
 #define SP5100_WDT_TRIGGER_BIT		(1 << 7)
 
-#define SP5100_PCI_WATCHDOG_MISC_REG	0x41
-#define SP5100_PCI_WATCHDOG_DECODE_EN	(1 << 3)
-
 #define SP5100_PM_IOPORTS_SIZE		0x02
 
-/* These two IO registers are hardcoded and there doesn't seem to be a way to
+/*
+ * These two IO registers are hardcoded and there doesn't seem to be a way to
  * read them from a register.
  */
+
+/*  For SP5100/SB7x0 chipset */
 #define SP5100_IO_PM_INDEX_REG		0xCD6
 #define SP5100_IO_PM_DATA_REG		0xCD7
 
+#define SP5100_SB_RESOURCE_MMIO_BASE	0x9C
+
 #define SP5100_PM_WATCHDOG_CONTROL	0x69
-#define SP5100_PM_WATCHDOG_BASE0	0x6C
-#define SP5100_PM_WATCHDOG_BASE1	0x6D
-#define SP5100_PM_WATCHDOG_BASE2	0x6E
-#define SP5100_PM_WATCHDOG_BASE3	0x6F
+#define SP5100_PM_WATCHDOG_BASE		0x6C
 
 #define SP5100_PM_WATCHDOG_FIRED	(1 << 1)
 #define SP5100_PM_WATCHDOG_ACTION_RESET	(1 << 2)
 
-#define SP5100_PM_WATCHDOG_DISABLE	1
+#define SP5100_PCI_WATCHDOG_MISC_REG	0x41
+#define SP5100_PCI_WATCHDOG_DECODE_EN	(1 << 3)
+
+#define SP5100_PM_WATCHDOG_DISABLE	(1 << 0)
 #define SP5100_PM_WATCHDOG_SECOND_RES	(3 << 1)
+
+#define SP5100_DEVNAME			"SP5100 TCO"
+
+
+/*  For SB8x0(or later) chipset */
+#define SB800_IO_PM_INDEX_REG		0xCD6
+#define SB800_IO_PM_DATA_REG		0xCD7
+
+#define SB800_PM_ACPI_MMIO_EN		0x24
+#define SB800_PM_WATCHDOG_CONTROL	0x48
+#define SB800_PM_WATCHDOG_BASE		0x48
+#define SB800_PM_WATCHDOG_CONFIG	0x4C
+
+#define SB800_PCI_WATCHDOG_DECODE_EN	(1 << 0)
+#define SB800_PM_WATCHDOG_DISABLE	(1 << 2)
+#define SB800_PM_WATCHDOG_SECOND_RES	(3 << 0)
+#define SB800_ACPI_MMIO_DECODE_EN	(1 << 0)
+#define SB800_ACPI_MMIO_SEL		(1 << 2)
+
+
+#define SB800_PM_WDT_MMIO_OFFSET	0xB00
+
+#define SB800_DEVNAME			"SB800 TCO"

drivers/watchdog/sp805_wdt.c

@@ -130,16 +130,10 @@ static int wdt_config(struct watchdog_device *wdd, bool ping)
 	int ret;
 
 	if (!ping) {
-		ret = clk_prepare(wdt->clk);
-		if (ret) {
-			dev_err(&wdt->adev->dev, "clock prepare fail");
-			return ret;
-		}
 
-		ret = clk_enable(wdt->clk);
+		ret = clk_prepare_enable(wdt->clk);
 		if (ret) {
 			dev_err(&wdt->adev->dev, "clock enable fail");
-			clk_unprepare(wdt->clk);
 			return ret;
 		}
 	}
@@ -190,8 +184,7 @@ static int wdt_disable(struct watchdog_device *wdd)
 	readl_relaxed(wdt->base + WDTLOCK);
 	spin_unlock(&wdt->lock);
 
-	clk_disable(wdt->clk);
-	clk_unprepare(wdt->clk);
+	clk_disable_unprepare(wdt->clk);
 
 	return 0;
 }

drivers/watchdog/twl4030_wdt.c

@@ -22,26 +22,12 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
-#include <linux/fs.h>
 #include <linux/watchdog.h>
 #include <linux/platform_device.h>
-#include <linux/miscdevice.h>
-#include <linux/uaccess.h>
 #include <linux/i2c/twl.h>
 
 #define TWL4030_WATCHDOG_CFG_REG_OFFS	0x3
 
-#define TWL4030_WDT_STATE_OPEN		0x1
-#define TWL4030_WDT_STATE_ACTIVE	0x8
-
-static struct platform_device *twl4030_wdt_dev;
-
-struct twl4030_wdt {
-	struct miscdevice	miscdev;
-	int			timer_margin;
-	unsigned long		state;
-};
-
 static bool nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, bool, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
@@ -49,175 +35,75 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
 
 static int twl4030_wdt_write(unsigned char val)
 {
-	return twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, val,
+	return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
 					TWL4030_WATCHDOG_CFG_REG_OFFS);
 }
 
-static int twl4030_wdt_enable(struct twl4030_wdt *wdt)
+static int twl4030_wdt_start(struct watchdog_device *wdt)
 {
-	return twl4030_wdt_write(wdt->timer_margin + 1);
+	return twl4030_wdt_write(wdt->timeout + 1);
 }
 
-static int twl4030_wdt_disable(struct twl4030_wdt *wdt)
+static int twl4030_wdt_stop(struct watchdog_device *wdt)
 {
 	return twl4030_wdt_write(0);
 }
 
-static int twl4030_wdt_set_timeout(struct twl4030_wdt *wdt, int timeout)
-{
-	if (timeout < 0 || timeout > 30) {
-		dev_warn(wdt->miscdev.parent,
-			"Timeout can only be in the range [0-30] seconds");
-		return -EINVAL;
-	}
-	wdt->timer_margin = timeout;
-	return twl4030_wdt_enable(wdt);
-}
-
-static ssize_t twl4030_wdt_write_fop(struct file *file,
-		const char __user *data, size_t len, loff_t *ppos)
-{
-	struct twl4030_wdt *wdt = file->private_data;
-
-	if (len)
-		twl4030_wdt_enable(wdt);
-
-	return len;
-}
-
-static long twl4030_wdt_ioctl(struct file *file,
-		unsigned int cmd, unsigned long arg)
+static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
+				   unsigned int timeout)
 {
-	void __user *argp = (void __user *)arg;
-	int __user *p = argp;
-	int new_margin;
-	struct twl4030_wdt *wdt = file->private_data;
-
-	static const struct watchdog_info twl4030_wd_ident = {
-		.identity = "TWL4030 Watchdog",
-		.options = WDIOF_SETTIMEOUT,
-		.firmware_version = 0,
-	};
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user(argp, &twl4030_wd_ident,
-				sizeof(twl4030_wd_ident)) ? -EFAULT : 0;
-
-	case WDIOC_GETSTATUS:
-	case WDIOC_GETBOOTSTATUS:
-		return put_user(0, p);
-
-	case WDIOC_KEEPALIVE:
-		twl4030_wdt_enable(wdt);
-		break;
-
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_margin, p))
-			return -EFAULT;
-		if (twl4030_wdt_set_timeout(wdt, new_margin))
-			return -EINVAL;
-		return put_user(wdt->timer_margin, p);
-
-	case WDIOC_GETTIMEOUT:
-		return put_user(wdt->timer_margin, p);
-
-	default:
-		return -ENOTTY;
-	}
-
+	wdt->timeout = timeout;
 	return 0;
 }
 
-static int twl4030_wdt_open(struct inode *inode, struct file *file)
-{
-	struct twl4030_wdt *wdt = platform_get_drvdata(twl4030_wdt_dev);
-
-	/* /dev/watchdog can only be opened once */
-	if (test_and_set_bit(0, &wdt->state))
-		return -EBUSY;
-
-	wdt->state |= TWL4030_WDT_STATE_ACTIVE;
-	file->private_data = (void *) wdt;
-
-	twl4030_wdt_enable(wdt);
-	return nonseekable_open(inode, file);
-}
-
-static int twl4030_wdt_release(struct inode *inode, struct file *file)
-{
-	struct twl4030_wdt *wdt = file->private_data;
-	if (nowayout) {
-		dev_alert(wdt->miscdev.parent,
-		       "Unexpected close, watchdog still running!\n");
-		twl4030_wdt_enable(wdt);
-	} else {
-		if (twl4030_wdt_disable(wdt))
-			return -EFAULT;
-		wdt->state &= ~TWL4030_WDT_STATE_ACTIVE;
-	}
-
-	clear_bit(0, &wdt->state);
-	return 0;
-}
+static const struct watchdog_info twl4030_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+	.identity = "TWL4030 Watchdog",
+};
 
-static const struct file_operations twl4030_wdt_fops = {
+static const struct watchdog_ops twl4030_wdt_ops = {
 	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.open		= twl4030_wdt_open,
-	.release	= twl4030_wdt_release,
-	.unlocked_ioctl	= twl4030_wdt_ioctl,
-	.write		= twl4030_wdt_write_fop,
+	.start		= twl4030_wdt_start,
+	.stop		= twl4030_wdt_stop,
+	.set_timeout	= twl4030_wdt_set_timeout,
 };
 
 static int twl4030_wdt_probe(struct platform_device *pdev)
 {
 	int ret = 0;
-	struct twl4030_wdt *wdt;
+	struct watchdog_device *wdt;
 
-	wdt = kzalloc(sizeof(struct twl4030_wdt), GFP_KERNEL);
+	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
 	if (!wdt)
 		return -ENOMEM;
 
-	wdt->state		= 0;
-	wdt->timer_margin	= 30;
-	wdt->miscdev.parent	= &pdev->dev;
-	wdt->miscdev.fops	= &twl4030_wdt_fops;
-	wdt->miscdev.minor	= WATCHDOG_MINOR;
-	wdt->miscdev.name	= "watchdog";
+	wdt->info		= &twl4030_wdt_info;
+	wdt->ops		= &twl4030_wdt_ops;
+	wdt->status		= 0;
+	wdt->timeout		= 30;
+	wdt->min_timeout	= 1;
+	wdt->max_timeout	= 30;
 
+	watchdog_set_nowayout(wdt, nowayout);
 	platform_set_drvdata(pdev, wdt);
 
-	twl4030_wdt_dev = pdev;
-
-	twl4030_wdt_disable(wdt);
+	twl4030_wdt_stop(wdt);
 
-	ret = misc_register(&wdt->miscdev);
+	ret = watchdog_register_device(wdt);
 	if (ret) {
-		dev_err(wdt->miscdev.parent,
-			"Failed to register misc device\n");
 		platform_set_drvdata(pdev, NULL);
-		kfree(wdt);
-		twl4030_wdt_dev = NULL;
 		return ret;
 	}
+
 	return 0;
 }
 
 static int twl4030_wdt_remove(struct platform_device *pdev)
 {
-	struct twl4030_wdt *wdt = platform_get_drvdata(pdev);
-
-	if (wdt->state & TWL4030_WDT_STATE_ACTIVE)
-		if (twl4030_wdt_disable(wdt))
-			return -EFAULT;
-
-	wdt->state &= ~TWL4030_WDT_STATE_ACTIVE;
-	misc_deregister(&wdt->miscdev);
+	struct watchdog_device *wdt = platform_get_drvdata(pdev);
 
+	watchdog_unregister_device(wdt);
 	platform_set_drvdata(pdev, NULL);
-	kfree(wdt);
-	twl4030_wdt_dev = NULL;
 
 	return 0;
 }
@@ -225,18 +111,18 @@ static int twl4030_wdt_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM
 static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
 {
-	struct twl4030_wdt *wdt = platform_get_drvdata(pdev);
-	if (wdt->state & TWL4030_WDT_STATE_ACTIVE)
-		return twl4030_wdt_disable(wdt);
+	struct watchdog_device *wdt = platform_get_drvdata(pdev);
+	if (watchdog_active(wdt))
+		return twl4030_wdt_stop(wdt);
 
 	return 0;
 }
 
 static int twl4030_wdt_resume(struct platform_device *pdev)
 {
-	struct twl4030_wdt *wdt = platform_get_drvdata(pdev);
-	if (wdt->state & TWL4030_WDT_STATE_ACTIVE)
-		return twl4030_wdt_enable(wdt);
+	struct watchdog_device *wdt = platform_get_drvdata(pdev);
+	if (watchdog_active(wdt))
+		return twl4030_wdt_start(wdt);
 
 	return 0;
 }
@@ -260,6 +146,5 @@ module_platform_driver(twl4030_wdt_driver);
 
 MODULE_AUTHOR("Nokia Corporation");
 MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 MODULE_ALIAS("platform:twl4030_wdt");
 

include/linux/watchdog.h

@@ -129,7 +129,7 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
 	return wdd->driver_data;
 }
 
-/* drivers/watchdog/core/watchdog_core.c */
+/* drivers/watchdog/watchdog_core.c */
 extern int watchdog_register_device(struct watchdog_device *);
 extern void watchdog_unregister_device(struct watchdog_device *);