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] wdt_pci.c: remove #ifdef CONFIG_WDT_501_PCI
  [WATCHDOG] hpwdt: Add NMI priority option
  [WATCHDOG] OMAP fixes: enable clock in probe, trigger timer reload
  [WATCHDOG] add bcm47xx watchdog driver
  [WATCHDOG] Freescale STMP: watchdog driver
  [WATCHDOG] twl4030 watchdog driver
  [WATCHDOG] U300 COH 901 327 watchdog driver
  [WATCHDOG] Add pnx833x_wdt

Documentation/watchdog/hpwdt.txt

@@ -19,30 +19,41 @@ Last reviewed: 06/02/2009
  not be updated in a timely fashion and a hardware system reset (also known as
  an Automatic Server Recovery (ASR)) event will occur.
 
- The hpwdt driver also has three (3) module parameters. They are the following:
+ The hpwdt driver also has four (4) module parameters. They are the following:
 
  soft_margin - allows the user to set the watchdog timer value
  allow_kdump - allows the user to save off a kernel dump image after an NMI
  nowayout    - basic watchdog parameter that does not allow the timer to
                be restarted or an impending ASR to be escaped.
+ priority    - determines whether or not the hpwdt driver is first on the
+               die_notify list to handle NMIs or last. The default value
+               for this module parameter is 0 or LAST. If the user wants to
+               enable NMI sourcing then reload the hpwdt driver with
+               priority=1 (and boot with nmi_watchdog=0).
 
  NOTE: More information about watchdog drivers in general, including the ioctl
        interface to /dev/watchdog can be found in
        Documentation/watchdog/watchdog-api.txt and Documentation/IPMI.txt.
 
- The NMI sourcing capability is disabled when the driver discovers that the
- nmi_watchdog is turned on (nmi_watchdog = 1). This is due to the inability to
+ The priority parameter was introduced due to other kernel software that relied
+ on handling NMIs (like oprofile). Keeping hpwdt's priority at 0 (or LAST)
+ enables the users of NMIs for non critical events to be work as expected.
+
+ The NMI sourcing capability is disabled by default due to the inability to
  distinguish between "NMI Watchdog Ticks" and "HW generated NMI events" in the
  Linux kernel. What this means is that the hpwdt nmi handler code is called
  each time the NMI signal fires off. This could amount to several thousands of
  NMIs in a matter of seconds. If a user sees the Linux kernel's "dazed and
  confused" message in the logs or if the system gets into a hung state, then
- the user should reboot with nmi_watchdog=0.
+ the hpwdt driver can be reloaded with the "priority" module parameter set
+ (priority=1).
 
  1. If the kernel has not been booted with nmi_watchdog turned off then
     edit /boot/grub/menu.lst and place the nmi_watchdog=0 at the end of the
     currently booting kernel line.
  2. reboot the sever
+ 3. Once the system comes up perform a rmmod hpwdt
+ 4. insmod /lib/modules/`uname -r`/kernel/drivers/char/watchdog/hpwdt.ko priority=1
 
  Now, the hpwdt can successfully receive and source the NMI and provide a log
  message that details the reason for the NMI (as determined by the HP BIOS).

drivers/mfd/twl4030-core.c

@@ -101,6 +101,12 @@
 #define twl_has_usb()	false
 #endif
 
+#if defined(CONFIG_TWL4030_WATCHDOG) || \
+	defined(CONFIG_TWL4030_WATCHDOG_MODULE)
+#define twl_has_watchdog()        true
+#else
+#define twl_has_watchdog()        false
+#endif
 
 /* Triton Core internal information (BEGIN) */
 
@@ -526,6 +532,12 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
 		usb_transceiver = child;
 	}
 
+	if (twl_has_watchdog()) {
+		child = add_child(0, "twl4030_wdt", NULL, 0, false, 0, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
 	if (twl_has_regulator()) {
 		/*
 		child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1);

drivers/watchdog/Kconfig

@@ -240,6 +240,32 @@ config ORION_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called orion_wdt.
 
+config COH901327_WATCHDOG
+	bool "ST-Ericsson COH 901 327 watchdog"
+	depends on ARCH_U300
+	default y if MACH_U300
+	help
+	  Say Y here to include Watchdog timer support for the
+	  watchdog embedded into the ST-Ericsson U300 series platforms.
+	  This watchdog is used to reset the system and thus cannot be
+	  compiled as a module.
+
+config TWL4030_WATCHDOG
+	tristate "TWL4030 Watchdog"
+	depends on TWL4030_CORE
+	help
+	  Support for TI TWL4030 watchdog.  Say 'Y' here to enable the
+	  watchdog timer support for TWL4030 chips.
+
+config STMP3XXX_WATCHDOG
+	tristate "Freescale STMP3XXX watchdog"
+	depends on ARCH_STMP3XXX
+	help
+	  Say Y here if to include support for the watchdog timer
+	  for the Sigmatel STMP37XX/378X SoC.
+	  To compile this driver as a module, choose M here: the
+	  module will be called stmp3xxx_wdt.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT
@@ -703,6 +729,12 @@ config SBC_EPX_C3_WATCHDOG
 
 # MIPS Architecture
 
+config BCM47XX_WDT
+	tristate "Broadcom BCM47xx Watchdog Timer"
+	depends on BCM47XX
+	help
+	  Hardware driver for the Broadcom BCM47xx Watchog Timer.
+
 config RC32434_WDT
 	tristate "IDT RC32434 SoC Watchdog Timer"
 	depends on MIKROTIK_RB532
@@ -729,6 +761,15 @@ config WDT_MTX1
 	  Hardware driver for the MTX-1 boards. This is a watchdog timer that
 	  will reboot the machine after a 100 seconds timer expired.
 
+config PNX833X_WDT
+	tristate "PNX833x Hardware Watchdog"
+	depends on SOC_PNX8335
+	help
+	  Hardware driver for the PNX833x's watchdog. This is a
+	  watchdog timer that will reboot the machine after a programable
+	  timer has expired and no process has written to /dev/watchdog during
+	  that time.
+
 config WDT_RM9K_GPI
 	tristate "RM9000/GPI hardware watchdog"
 	depends on CPU_RM9000
@@ -966,24 +1007,16 @@ config WDTPCI
 	---help---
 	  If you have a PCI-WDT500/501 watchdog board, say Y here, otherwise N.
 
-	  To compile this driver as a module, choose M here: the
-	  module will be called wdt_pci.
-
-config WDT_501_PCI
-	bool "PCI-WDT501 features"
-	depends on WDTPCI
-	help
-	  Saying Y here and creating a character special file /dev/temperature
-	  with major number 10 and minor number 131 ("man mknod") will give
-	  you a thermometer inside your computer: reading from
-	  /dev/temperature yields one byte, the temperature in degrees
-	  Fahrenheit. This works only if you have a PCI-WDT501 watchdog board
-	  installed.
+	  If you have a PCI-WDT501 watchdog board then you can enable the
+	  temperature sensor by setting the type parameter to 501.
 
 	  If you want to enable the Fan Tachometer on the PCI-WDT501, then you
 	  can do this via the tachometer parameter. Only do this if you have a
 	  fan tachometer actually set up.
 
+	  To compile this driver as a module, choose M here: the
+	  module will be called wdt_pci.
+
 #
 # USB-based Watchdog Cards
 #

drivers/watchdog/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
 obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o
 obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o
 obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
+obj-$(CONFIG_TWL4030_WATCHDOG) += twl4030_wdt.o
 obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
 obj-$(CONFIG_977_WATCHDOG) += wdt977.o
 obj-$(CONFIG_IXP2000_WATCHDOG) += ixp2000_wdt.o
@@ -41,6 +42,8 @@ obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
 obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
 obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
 obj-$(CONFIG_ORION_WATCHDOG) += orion_wdt.o
+obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
+obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
@@ -98,9 +101,11 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
 # M68KNOMMU Architecture
 
 # MIPS Architecture
+obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
 obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
 obj-$(CONFIG_INDYDOG) += indydog.o
 obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
+obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
 obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
 obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
 obj-$(CONFIG_AR7_WDT) += ar7_wdt.o

drivers/watchdog/bcm47xx_wdt.c

+/*
+ *  Watchdog driver for Broadcom BCM47XX
+ *
+ *  Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
+ *  Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.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.
+ */
+
+#include <linux/bitops.h>
+#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/reboot.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/ssb/ssb_embedded.h>
+#include <asm/mach-bcm47xx/bcm47xx.h>
+
+#define DRV_NAME		"bcm47xx_wdt"
+
+#define WDT_DEFAULT_TIME	30	/* seconds */
+#define WDT_MAX_TIME		255	/* seconds */
+
+static int wdt_time = WDT_DEFAULT_TIME;
+static int nowayout = WATCHDOG_NOWAYOUT;
+
+module_param(wdt_time, int, 0);
+MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
+				__MODULE_STRING(WDT_DEFAULT_TIME) ")");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+#endif
+
+static unsigned long bcm47xx_wdt_busy;
+static char expect_release;
+static struct timer_list wdt_timer;
+static atomic_t ticks;
+
+static inline void bcm47xx_wdt_hw_start(void)
+{
+	/* this is 2,5s on 100Mhz clock  and 2s on 133 Mhz */
+	ssb_watchdog_timer_set(&ssb_bcm47xx, 0xfffffff);
+}
+
+static inline int bcm47xx_wdt_hw_stop(void)
+{
+	return ssb_watchdog_timer_set(&ssb_bcm47xx, 0);
+}
+
+static void bcm47xx_timer_tick(unsigned long unused)
+{
+	if (!atomic_dec_and_test(&ticks)) {
+		bcm47xx_wdt_hw_start();
+		mod_timer(&wdt_timer, jiffies + HZ);
+	} else {
+		printk(KERN_CRIT DRV_NAME "Watchdog will fire soon!!!\n");
+	}
+}
+
+static inline void bcm47xx_wdt_pet(void)
+{
+	atomic_set(&ticks, wdt_time);
+}
+
+static void bcm47xx_wdt_start(void)
+{
+	bcm47xx_wdt_pet();
+	bcm47xx_timer_tick(0);
+}
+
+static void bcm47xx_wdt_pause(void)
+{
+	del_timer_sync(&wdt_timer);
+	bcm47xx_wdt_hw_stop();
+}
+
+static void bcm47xx_wdt_stop(void)
+{
+	bcm47xx_wdt_pause();
+}
+
+static int bcm47xx_wdt_settimeout(int new_time)
+{
+	if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
+		return -EINVAL;
+
+	wdt_time = new_time;
+	return 0;
+}
+
+static int bcm47xx_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &bcm47xx_wdt_busy))
+		return -EBUSY;
+
+	bcm47xx_wdt_start();
+	return nonseekable_open(inode, file);
+}
+
+static int bcm47xx_wdt_release(struct inode *inode, struct file *file)
+{
+	if (expect_release == 42) {
+		bcm47xx_wdt_stop();
+	} else {
+		printk(KERN_CRIT DRV_NAME
+			": Unexpected close, not stopping watchdog!\n");
+		bcm47xx_wdt_start();
+	}
+
+	clear_bit(0, &bcm47xx_wdt_busy);
+	expect_release = 0;
+	return 0;
+}
+
+static ssize_t bcm47xx_wdt_write(struct file *file, const char __user *data,
+				size_t len, loff_t *ppos)
+{
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			expect_release = 0;
+
+			for (i = 0; i != len; i++) {
+				char c;
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_release = 42;
+			}
+		}
+		bcm47xx_wdt_pet();
+	}
+	return len;
+}
+
+static struct watchdog_info bcm47xx_wdt_info = {
+	.identity 	= DRV_NAME,
+	.options 	= WDIOF_SETTIMEOUT |
+				WDIOF_KEEPALIVEPING |
+				WDIOF_MAGICCLOSE,
+};
+
+static long bcm47xx_wdt_ioctl(struct file *file,
+					unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	int new_value, retval = -EINVAL;;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		return copy_to_user(argp, &bcm47xx_wdt_info,
+				sizeof(bcm47xx_wdt_info)) ? -EFAULT : 0;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, p);
+
+	case WDIOC_SETOPTIONS:
+		if (get_user(new_value, p))
+			return -EFAULT;
+
+		if (new_value & WDIOS_DISABLECARD) {
+			bcm47xx_wdt_stop();
+			retval = 0;
+		}
+
+		if (new_value & WDIOS_ENABLECARD) {
+			bcm47xx_wdt_start();
+			retval = 0;
+		}
+
+		return retval;
+
+	case WDIOC_KEEPALIVE:
+		bcm47xx_wdt_pet();
+		return 0;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_value, p))
+			return -EFAULT;
+
+		if (bcm47xx_wdt_settimeout(new_value))
+			return -EINVAL;
+
+		bcm47xx_wdt_pet();
+
+	case WDIOC_GETTIMEOUT:
+		return put_user(wdt_time, p);
+
+	default:
+		return -ENOTTY;
+	}
+}
+
+static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
+	unsigned long code, void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT)
+		bcm47xx_wdt_stop();
+	return NOTIFY_DONE;
+}
+
+static const struct file_operations bcm47xx_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.unlocked_ioctl	= bcm47xx_wdt_ioctl,
+	.open		= bcm47xx_wdt_open,
+	.release	= bcm47xx_wdt_release,
+	.write		= bcm47xx_wdt_write,
+};
+
+static struct miscdevice bcm47xx_wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &bcm47xx_wdt_fops,
+};
+
+static struct notifier_block bcm47xx_wdt_notifier = {
+	.notifier_call = bcm47xx_wdt_notify_sys,
+};
+
+static int __init bcm47xx_wdt_init(void)
+{
+	int ret;
+
+	if (bcm47xx_wdt_hw_stop() < 0)
+		return -ENODEV;
+
+	setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
+
+	if (bcm47xx_wdt_settimeout(wdt_time)) {
+		bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);
+		printk(KERN_INFO DRV_NAME ": "
+			"wdt_time value must be 0 < wdt_time < %d, using %d\n",
+			(WDT_MAX_TIME + 1), wdt_time);
+	}
+
+	ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
+	if (ret)
+		return ret;
+
+	ret = misc_register(&bcm47xx_wdt_miscdev);
+	if (ret) {
+		unregister_reboot_notifier(&bcm47xx_wdt_notifier);
+		return ret;
+	}
+
+	printk(KERN_INFO "BCM47xx Watchdog Timer enabled (%d seconds%s)\n",
+				wdt_time, nowayout ? ", nowayout" : "");
+	return 0;
+}
+
+static void __exit bcm47xx_wdt_exit(void)
+{
+	if (!nowayout)
+		bcm47xx_wdt_stop();
+
+	misc_deregister(&bcm47xx_wdt_miscdev);
+
+	unregister_reboot_notifier(&bcm47xx_wdt_notifier);
+}
+
+module_init(bcm47xx_wdt_init);
+module_exit(bcm47xx_wdt_exit);
+
+MODULE_AUTHOR("Aleksandar Radovanovic");
+MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/watchdog/hpwdt.c

@@ -120,7 +120,8 @@ static int nowayout = WATCHDOG_NOWAYOUT;
 static char expect_release;
 static unsigned long hpwdt_is_open;
 static unsigned int allow_kdump;
-static int hpwdt_nmi_sourcing;
+static unsigned int hpwdt_nmi_sourcing;
+static unsigned int priority;		/* hpwdt at end of die_notify list */
 
 static void __iomem *pci_mem_addr;		/* the PCI-memory address */
 static unsigned long __iomem *hpwdt_timer_reg;
@@ -623,7 +624,7 @@ static struct miscdevice hpwdt_miscdev = {
 
 static struct notifier_block die_notifier = {
 	.notifier_call = hpwdt_pretimeout,
-	.priority = 0x7FFFFFFF,
+	.priority = 0,
 };
 
 /*
@@ -641,7 +642,8 @@ static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
 		hpwdt_nmi_sourcing = 1;
 	else
 		dev_warn(&dev->dev, "NMI sourcing is disabled. To enable this "
-			"functionality you must reboot with nmi_watchdog=0.\n");
+			"functionality you must reboot with nmi_watchdog=0 "
+			"and load the hpwdt driver with priority=1.\n");
 }
 #else
 static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
@@ -714,6 +716,14 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
 	cmn_regs.u1.rah = 0x0D;
 	cmn_regs.u1.ral = 0x02;
 
+	/*
+	 * If the priority is set to 1, then we will be put first on the
+	 * die notify list to handle a critical NMI. The default is to
+	 * be last so other users of the NMI signal can function.
+	 */
+	if (priority)
+		die_notifier.priority = 0x7FFFFFFF;
+
 	retval = register_die_notifier(&die_notifier);
 	if (retval != 0) {
 		dev_warn(&dev->dev,
@@ -733,9 +743,11 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
 	printk(KERN_INFO
 		"hp Watchdog Timer Driver: %s"
 		", timer margin: %d seconds (nowayout=%d)"
-		", allow kernel dump: %s (default = 0/OFF).\n",
+		", allow kernel dump: %s (default = 0/OFF)"
+		", priority: %s (default = 0/LAST).\n",
 		HPWDT_VERSION, soft_margin, nowayout,
-		(allow_kdump == 0) ? "OFF" : "ON");
+		(allow_kdump == 0) ? "OFF" : "ON",
+		(priority == 0) ? "LAST" : "FIRST");
 
 	return 0;
 
@@ -798,5 +810,9 @@ module_param(nowayout, int, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
+		" (default = 0/Last)\n");
+
 module_init(hpwdt_init);
 module_exit(hpwdt_cleanup);

drivers/watchdog/omap_wdt.c

@@ -159,6 +159,7 @@ static int omap_wdt_open(struct inode *inode, struct file *file)
 	file->private_data = (void *) wdev;
 
 	omap_wdt_set_timeout(wdev);
+	omap_wdt_ping(wdev); /* trigger loading of new timeout value */
 	omap_wdt_enable(wdev);
 
 	return nonseekable_open(inode, file);
@@ -313,6 +314,9 @@ static int __devinit omap_wdt_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, wdev);
 
+	clk_enable(wdev->ick);
+	clk_enable(wdev->fck);
+
 	omap_wdt_disable(wdev);
 	omap_wdt_adjust_timeout(timer_margin);
 
@@ -332,6 +336,9 @@ static int __devinit omap_wdt_probe(struct platform_device *pdev)
 	/* autogate OCP interface clock */
 	__raw_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG);
 
+	clk_disable(wdev->ick);
+	clk_disable(wdev->fck);
+
 	omap_wdt_dev = pdev;
 
 	return 0;

drivers/watchdog/pnx833x_wdt.c

+/*
+ *  PNX833x Hardware Watchdog Driver
+ *  Copyright 2008 NXP Semiconductors
+ *  Daniel Laird <daniel.j.laird@nxp.com>
+ *  Andre McCurdy <andre.mccurdy@nxp.com>
+ *
+ *  Heavily based upon - IndyDog	0.3
+ *  A Hardware Watchdog Device for SGI IP22
+ *
+ * (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>, All Rights Reserved.
+ *
+ * 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.
+ *
+ * based on softdog.c by Alan Cox <alan@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.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/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <asm/mach-pnx833x/pnx833x.h>
+
+#define PFX "pnx833x: "
+#define WATCHDOG_TIMEOUT 30		/* 30 sec Maximum timeout */
+#define WATCHDOG_COUNT_FREQUENCY 68000000U /* Watchdog counts at 68MHZ. */
+
+/** CONFIG block */
+#define PNX833X_CONFIG                      (0x07000U)
+#define PNX833X_CONFIG_CPU_WATCHDOG         (0x54)
+#define PNX833X_CONFIG_CPU_WATCHDOG_COMPARE (0x58)
+#define PNX833X_CONFIG_CPU_COUNTERS_CONTROL (0x1c)
+
+/** RESET block */
+#define PNX833X_RESET                       (0x08000U)
+#define PNX833X_RESET_CONFIG                (0x08)
+
+static int pnx833x_wdt_alive;
+
+/* Set default timeout in MHZ.*/
+static int pnx833x_wdt_timeout = (WATCHDOG_TIMEOUT * WATCHDOG_COUNT_FREQUENCY);
+module_param(pnx833x_wdt_timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in Mhz. (68Mhz clock), default="
+			__MODULE_STRING(pnx833x_wdt_timeout) "(30 seconds).");
+
+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 int start_enabled = 1;
+module_param(start_enabled, int, 0);
+MODULE_PARM_DESC(start_enabled, "Watchdog is started on module insertion "
+				"(default=" __MODULE_STRING(start_enabled) ")");
+
+static void pnx833x_wdt_start(void)
+{
+	/* Enable watchdog causing reset. */
+	PNX833X_REG(PNX833X_RESET + PNX833X_RESET_CONFIG) |= 0x1;
+	/* Set timeout.*/
+	PNX833X_REG(PNX833X_CONFIG +
+		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
+	/* Enable watchdog. */
+	PNX833X_REG(PNX833X_CONFIG +
+				PNX833X_CONFIG_CPU_COUNTERS_CONTROL) |= 0x1;
+
+	printk(KERN_INFO PFX "Started watchdog timer.\n");
+}
+
+static void pnx833x_wdt_stop(void)
+{
+	/* Disable watchdog causing reset. */
+	PNX833X_REG(PNX833X_RESET + PNX833X_CONFIG) &= 0xFFFFFFFE;
+	/* Disable watchdog.*/
+	PNX833X_REG(PNX833X_CONFIG +
+			PNX833X_CONFIG_CPU_COUNTERS_CONTROL) &= 0xFFFFFFFE;
+
+	printk(KERN_INFO PFX "Stopped watchdog timer.\n");
+}
+
+static void pnx833x_wdt_ping(void)
+{
+	PNX833X_REG(PNX833X_CONFIG +
+		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
+}
+
+/*
+ *	Allow only one person to hold it open
+ */
+static int pnx833x_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &pnx833x_wdt_alive))
+		return -EBUSY;
+
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
+	/* Activate timer */
+	if (!start_enabled)
+		pnx833x_wdt_start();
+
+	pnx833x_wdt_ping();
+
+	printk(KERN_INFO "Started watchdog timer.\n");
+
+	return nonseekable_open(inode, file);
+}
+
+static int pnx833x_wdt_release(struct inode *inode, struct file *file)
+{
+	/* Shut off the timer.
+	 * Lock it in if it's a module and we defined ...NOWAYOUT */
+	if (!nowayout)
+		pnx833x_wdt_stop(); /* Turn the WDT off */
+
+	clear_bit(0, &pnx833x_wdt_alive);
+	return 0;
+}
+
+static ssize_t pnx833x_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+{
+	/* Refresh the timer. */
+	if (len)
+		pnx833x_wdt_ping();
+
+	return len;
+}
+
+static long pnx833x_wdt_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
+{
+	int options, new_timeout = 0;
+	uint32_t timeout, timeout_left = 0;
+
+	static struct watchdog_info ident = {
+		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
+		.firmware_version = 0,
+		.identity = "Hardware Watchdog for PNX833x",
+	};
+
+	switch (cmd) {
+	default:
+		return -ENOTTY;
+
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user((struct watchdog_info *)arg,
+				 &ident, sizeof(ident)))
+			return -EFAULT;
+		return 0;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		return put_user(0, (int *)arg);
+
+	case WDIOC_SETOPTIONS:
+		if (get_user(options, (int *)arg))
+			return -EFAULT;
+
+		if (options & WDIOS_DISABLECARD)
+			pnx833x_wdt_stop();
+
+		if (options & WDIOS_ENABLECARD)
+			pnx833x_wdt_start();
+
+		return 0;
+
+	case WDIOC_KEEPALIVE:
+		pnx833x_wdt_ping();
+		return 0;
+
+	case WDIOC_SETTIMEOUT:
+	{
+		if (get_user(new_timeout, (int *)arg))
+			return -EFAULT;
+
+		pnx833x_wdt_timeout = new_timeout;
+		PNX833X_REG(PNX833X_CONFIG +
+			PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = new_timeout;
+		return put_user(new_timeout, (int *)arg);
+	}
+
+	case WDIOC_GETTIMEOUT:
+		timeout = PNX833X_REG(PNX833X_CONFIG +
+					PNX833X_CONFIG_CPU_WATCHDOG_COMPARE);
+		return put_user(timeout, (int *)arg);
+
+	case WDIOC_GETTIMELEFT:
+		timeout_left = PNX833X_REG(PNX833X_CONFIG +
+						PNX833X_CONFIG_CPU_WATCHDOG);
+		return put_user(timeout_left, (int *)arg);
+
+	}
+}
+
+static int pnx833x_wdt_notify_sys(struct notifier_block *this,
+					unsigned long code, void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT)
+		pnx833x_wdt_stop(); /* Turn the WDT off */
+
+	return NOTIFY_DONE;
+}
+
+static const struct file_operations pnx833x_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= pnx833x_wdt_write,
+	.unlocked_ioctl	= pnx833x_wdt_ioctl,
+	.open		= pnx833x_wdt_open,
+	.release	= pnx833x_wdt_release,
+};
+
+static struct miscdevice pnx833x_wdt_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &pnx833x_wdt_fops,
+};
+
+static struct notifier_block pnx833x_wdt_notifier = {
+	.notifier_call = pnx833x_wdt_notify_sys,
+};
+
+static char banner[] __initdata =
+	KERN_INFO PFX "Hardware Watchdog Timer for PNX833x: Version 0.1\n";
+
+static int __init watchdog_init(void)
+{
+	int ret, cause;
+
+	/* Lets check the reason for the reset.*/
+	cause = PNX833X_REG(PNX833X_RESET);
+	/*If bit 31 is set then watchdog was cause of reset.*/
+	if (cause & 0x80000000) {
+		printk(KERN_INFO PFX "The system was previously reset due to "
+			"the watchdog firing - please investigate...\n");
+	}
+
+	ret = register_reboot_notifier(&pnx833x_wdt_notifier);
+	if (ret) {
+		printk(KERN_ERR PFX
+			"cannot register reboot notifier (err=%d)\n", ret);
+		return ret;
+	}
+
+	ret = misc_register(&pnx833x_wdt_miscdev);
+	if (ret) {
+		printk(KERN_ERR PFX
+			"cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		unregister_reboot_notifier(&pnx833x_wdt_notifier);
+		return ret;
+	}
+
+	printk(banner);
+	if (start_enabled)
+		pnx833x_wdt_start();
+
+	return 0;
+}
+
+static void __exit watchdog_exit(void)
+{
+	misc_deregister(&pnx833x_wdt_miscdev);
+	unregister_reboot_notifier(&pnx833x_wdt_notifier);
+}
+
+module_init(watchdog_init);
+module_exit(watchdog_exit);
+
+MODULE_AUTHOR("Daniel Laird/Andre McCurdy");
+MODULE_DESCRIPTION("Hardware Watchdog Device for PNX833x");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/watchdog/stmp3xxx_wdt.c

+/*
+ * Watchdog driver for Freescale STMP37XX/STMP378X
+ *
+ * Author: Vitaly Wool <vital@embeddedalley.com>
+ *
+ * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+
+#include <mach/platform.h>
+#include <mach/regs-rtc.h>
+
+#define DEFAULT_HEARTBEAT	19
+#define MAX_HEARTBEAT		(0x10000000 >> 6)
+
+/* missing bitmask in headers */
+#define BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER     0x80000000
+
+#define WDT_IN_USE		0
+#define WDT_OK_TO_CLOSE		1
+
+#define WDOG_COUNTER_RATE	1000 /* 1 kHz clock */
+
+static DEFINE_SPINLOCK(stmp3xxx_wdt_io_lock);
+static unsigned long wdt_status;
+static const int nowayout = WATCHDOG_NOWAYOUT;
+static int heartbeat = DEFAULT_HEARTBEAT;
+static unsigned long boot_status;
+
+static void wdt_enable(u32 value)
+{
+	spin_lock(&stmp3xxx_wdt_io_lock);
+	__raw_writel(value, REGS_RTC_BASE + HW_RTC_WATCHDOG);
+	stmp3xxx_setl(BM_RTC_CTRL_WATCHDOGEN, REGS_RTC_BASE + HW_RTC_CTRL);
+	stmp3xxx_setl(BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER,
+			REGS_RTC_BASE + HW_RTC_PERSISTENT1);
+	spin_unlock(&stmp3xxx_wdt_io_lock);
+}
+
+static void wdt_disable(void)
+{
+	spin_lock(&stmp3xxx_wdt_io_lock);
+	stmp3xxx_clearl(BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER,
+			REGS_RTC_BASE + HW_RTC_PERSISTENT1);
+	stmp3xxx_clearl(BM_RTC_CTRL_WATCHDOGEN, REGS_RTC_BASE + HW_RTC_CTRL);
+	spin_unlock(&stmp3xxx_wdt_io_lock);
+}
+
+static void wdt_ping(void)
+{
+	wdt_enable(heartbeat * WDOG_COUNTER_RATE);
+}
+
+static int stmp3xxx_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_ping();
+
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t stmp3xxx_wdt_write(struct file *file, const char __user *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_ping();
+	}
+
+	return len;
+}
+
+static struct watchdog_info ident = {
+	.options	= WDIOF_CARDRESET |
+			  WDIOF_MAGICCLOSE |
+			  WDIOF_SETTIMEOUT |
+			  WDIOF_KEEPALIVEPING,
+	.identity	= "STMP3XXX Watchdog",
+};
+
+static long stmp3xxx_wdt_ioctl(struct file *file, unsigned int cmd,
+	unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	int new_heartbeat, opts;
+	int ret = -ENOTTY;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
+		break;
+
+	case WDIOC_GETSTATUS:
+		ret = put_user(0, p);
+		break;
+
+	case WDIOC_GETBOOTSTATUS:
+		ret = put_user(boot_status, p);
+		break;
+
+	case WDIOC_SETOPTIONS:
+		if (get_user(opts, p)) {
+			ret = -EFAULT;
+			break;
+		}
+		if (opts & WDIOS_DISABLECARD)
+			wdt_disable();
+		else if (opts & WDIOS_ENABLECARD)
+			wdt_ping();
+		else {
+			pr_debug("%s: unknown option 0x%x\n", __func__, opts);
+			ret = -EINVAL;
+			break;
+		}
+		ret = 0;
+		break;
+
+	case WDIOC_KEEPALIVE:
+		wdt_ping();
+		ret = 0;
+		break;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_heartbeat, p)) {
+			ret = -EFAULT;
+			break;
+		}
+		if (new_heartbeat <= 0 || new_heartbeat > MAX_HEARTBEAT) {
+			ret = -EINVAL;
+			break;
+		}
+
+		heartbeat = new_heartbeat;
+		wdt_ping();
+		/* Fall through */
+
+	case WDIOC_GETTIMEOUT:
+		ret = put_user(heartbeat, p);
+		break;
+	}
+	return ret;
+}
+
+static int stmp3xxx_wdt_release(struct inode *inode, struct file *file)
+{
+	int ret = 0;
+
+	if (!nowayout) {
+		if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
+			wdt_ping();
+			pr_debug("%s: Device closed unexpectdly\n", __func__);
+			ret = -EINVAL;
+		} else {
+			wdt_disable();
+			clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+		}
+	}
+	clear_bit(WDT_IN_USE, &wdt_status);
+
+	return ret;
+}
+
+static const struct file_operations stmp3xxx_wdt_fops = {
+	.owner = THIS_MODULE,
+	.llseek = no_llseek,
+	.write = stmp3xxx_wdt_write,
+	.unlocked_ioctl = stmp3xxx_wdt_ioctl,
+	.open = stmp3xxx_wdt_open,
+	.release = stmp3xxx_wdt_release,
+};
+
+static struct miscdevice stmp3xxx_wdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &stmp3xxx_wdt_fops,
+};
+
+static int __devinit stmp3xxx_wdt_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT)
+		heartbeat = DEFAULT_HEARTBEAT;
+
+	boot_status = __raw_readl(REGS_RTC_BASE + HW_RTC_PERSISTENT1) &
+			BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER;
+	boot_status = !!boot_status;
+	stmp3xxx_clearl(BV_RTC_PERSISTENT1_GENERAL__RTC_FORCE_UPDATER,
+			REGS_RTC_BASE + HW_RTC_PERSISTENT1);
+	wdt_disable();		/* disable for now */
+
+	ret = misc_register(&stmp3xxx_wdt_miscdev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "cannot register misc device\n");
+		return ret;
+	}
+
+	printk(KERN_INFO "stmp3xxx watchdog: initialized, heartbeat %d sec\n",
+		heartbeat);
+
+	return ret;
+}
+
+static int __devexit stmp3xxx_wdt_remove(struct platform_device *pdev)
+{
+	misc_deregister(&stmp3xxx_wdt_miscdev);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int wdt_suspended;
+static u32 wdt_saved_time;
+
+static int stmp3xxx_wdt_suspend(struct platform_device *pdev,
+				pm_message_t state)
+{
+	if (__raw_readl(REGS_RTC_BASE + HW_RTC_CTRL) &
+		BM_RTC_CTRL_WATCHDOGEN) {
+		wdt_suspended = 1;
+		wdt_saved_time = __raw_readl(REGS_RTC_BASE + HW_RTC_WATCHDOG);
+		wdt_disable();
+	}
+	return 0;
+}
+
+static int stmp3xxx_wdt_resume(struct platform_device *pdev)
+{
+	if (wdt_suspended) {
+		wdt_enable(wdt_saved_time);
+		wdt_suspended = 0;
+	}
+	return 0;
+}
+#else
+#define stmp3xxx_wdt_suspend	NULL
+#define stmp3xxx_wdt_resume	NULL
+#endif
+
+static struct platform_driver platform_wdt_driver = {
+	.driver = {
+		.name = "stmp3xxx_wdt",
+	},
+	.probe = stmp3xxx_wdt_probe,
+	.remove = __devexit_p(stmp3xxx_wdt_remove),
+	.suspend = stmp3xxx_wdt_suspend,
+	.resume = stmp3xxx_wdt_resume,
+};
+
+static int __init stmp3xxx_wdt_init(void)
+{
+	return platform_driver_register(&platform_wdt_driver);
+}
+
+static void __exit stmp3xxx_wdt_exit(void)
+{
+	return platform_driver_unregister(&platform_wdt_driver);
+}
+
+module_init(stmp3xxx_wdt_init);
+module_exit(stmp3xxx_wdt_exit);
+
+MODULE_DESCRIPTION("STMP3XXX Watchdog Driver");
+MODULE_LICENSE("GPL");
+
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat,
+		 "Watchdog heartbeat period in seconds from 1 to "
+		 __MODULE_STRING(MAX_HEARTBEAT) ", default "
+		 __MODULE_STRING(DEFAULT_HEARTBEAT));
+
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/watchdog/twl4030_wdt.c

+/*
+ * Copyright (C) Nokia Corporation
+ *
+ * Written by Timo Kokkonen <timo.t.kokkonen at nokia.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/types.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/twl4030.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 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 int twl4030_wdt_write(unsigned char val)
+{
+	return twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, val,
+					TWL4030_WATCHDOG_CFG_REG_OFFS);
+}
+
+static int twl4030_wdt_enable(struct twl4030_wdt *wdt)
+{
+	return twl4030_wdt_write(wdt->timer_margin + 1);
+}
+
+static int twl4030_wdt_disable(struct twl4030_wdt *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)
+{
+	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;
+	}
+
+	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 file_operations twl4030_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.open		= twl4030_wdt_open,
+	.release	= twl4030_wdt_release,
+	.unlocked_ioctl	= twl4030_wdt_ioctl,
+	.write		= twl4030_wdt_write_fop,
+};
+
+static int __devinit twl4030_wdt_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct twl4030_wdt *wdt;
+
+	wdt = kzalloc(sizeof(struct twl4030_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";
+
+	platform_set_drvdata(pdev, wdt);
+
+	twl4030_wdt_dev = pdev;
+
+	ret = misc_register(&wdt->miscdev);
+	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 __devexit 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);
+
+	platform_set_drvdata(pdev, NULL);
+	kfree(wdt);
+	twl4030_wdt_dev = NULL;
+
+	return 0;
+}
+
+#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);
+
+	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);
+
+	return 0;
+}
+#else
+#define twl4030_wdt_suspend        NULL
+#define twl4030_wdt_resume         NULL
+#endif
+
+static struct platform_driver twl4030_wdt_driver = {
+	.probe		= twl4030_wdt_probe,
+	.remove		= __devexit_p(twl4030_wdt_remove),
+	.suspend	= twl4030_wdt_suspend,
+	.resume		= twl4030_wdt_resume,
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "twl4030_wdt",
+	},
+};
+
+static int __devinit twl4030_wdt_init(void)
+{
+	return platform_driver_register(&twl4030_wdt_driver);
+}
+module_init(twl4030_wdt_init);
+
+static void __devexit twl4030_wdt_exit(void)
+{
+	platform_driver_unregister(&twl4030_wdt_driver);
+}
+module_exit(twl4030_wdt_exit);
+
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:twl4030_wdt");
+

drivers/watchdog/wdt_pci.c

@@ -2,7 +2,7 @@
  *	Industrial Computer Source PCI-WDT500/501 driver
  *
  *	(c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
- *						 All Rights Reserved.
+ *						All Rights Reserved.
  *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License
@@ -99,14 +99,16 @@ MODULE_PARM_DESC(nowayout,
 		"Watchdog cannot be stopped once started (default="
 				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
-#ifdef CONFIG_WDT_501_PCI
 /* Support for the Fan Tachometer on the PCI-WDT501 */
 static int tachometer;
-
 module_param(tachometer, int, 0);
 MODULE_PARM_DESC(tachometer,
-	"PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
-#endif /* CONFIG_WDT_501_PCI */
+		"PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
+
+static int type = 500;
+module_param(type, int, 0);
+MODULE_PARM_DESC(type,
+		"PCI-WDT501 Card type (500 or 501 , default=500)");
 
 /*
  *	Programming support
@@ -266,22 +268,21 @@ static int wdtpci_get_status(int *status)
 		*status |= WDIOF_EXTERN1;
 	if (new_status & WDC_SR_ISII1)
 		*status |= WDIOF_EXTERN2;
-#ifdef CONFIG_WDT_501_PCI
-	if (!(new_status & WDC_SR_TGOOD))
-		*status |= WDIOF_OVERHEAT;
-	if (!(new_status & WDC_SR_PSUOVER))
-		*status |= WDIOF_POWEROVER;
-	if (!(new_status & WDC_SR_PSUUNDR))
-		*status |= WDIOF_POWERUNDER;
-	if (tachometer) {
-		if (!(new_status & WDC_SR_FANGOOD))
-			*status |= WDIOF_FANFAULT;
+	if (type == 501) {
+		if (!(new_status & WDC_SR_TGOOD))
+			*status |= WDIOF_OVERHEAT;
+		if (!(new_status & WDC_SR_PSUOVER))
+			*status |= WDIOF_POWEROVER;
+		if (!(new_status & WDC_SR_PSUUNDR))
+			*status |= WDIOF_POWERUNDER;
+		if (tachometer) {
+			if (!(new_status & WDC_SR_FANGOOD))
+				*status |= WDIOF_FANFAULT;
+		}
 	}
-#endif /* CONFIG_WDT_501_PCI */
 	return 0;
 }
 
-#ifdef CONFIG_WDT_501_PCI
 /**
  *	wdtpci_get_temperature:
  *
@@ -300,7 +301,6 @@ static int wdtpci_get_temperature(int *temperature)
 	*temperature = (c * 11 / 15) + 7;
 	return 0;
 }
-#endif /* CONFIG_WDT_501_PCI */
 
 /**
  *	wdtpci_interrupt:
@@ -327,22 +327,22 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
 
 	printk(KERN_CRIT PFX "status %d\n", status);
 
-#ifdef CONFIG_WDT_501_PCI
-	if (!(status & WDC_SR_TGOOD)) {
-		u8 alarm = inb(WDT_RT);
-		printk(KERN_CRIT PFX "Overheat alarm.(%d)\n", alarm);
-		udelay(8);
-	}
-	if (!(status & WDC_SR_PSUOVER))
-		printk(KERN_CRIT PFX "PSU over voltage.\n");
-	if (!(status & WDC_SR_PSUUNDR))
-		printk(KERN_CRIT PFX "PSU under voltage.\n");
-	if (tachometer) {
-		if (!(status & WDC_SR_FANGOOD))
-			printk(KERN_CRIT PFX "Possible fan fault.\n");
+	if (type == 501) {
+		if (!(status & WDC_SR_TGOOD)) {
+			printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",
+								inb(WDT_RT));
+			udelay(8);
+		}
+		if (!(status & WDC_SR_PSUOVER))
+			printk(KERN_CRIT PFX "PSU over voltage.\n");
+		if (!(status & WDC_SR_PSUUNDR))
+			printk(KERN_CRIT PFX "PSU under voltage.\n");
+		if (tachometer) {
+			if (!(status & WDC_SR_FANGOOD))
+				printk(KERN_CRIT PFX "Possible fan fault.\n");
+		}
 	}
-#endif /* CONFIG_WDT_501_PCI */
-	if (!(status&WDC_SR_WCCR)) {
+	if (!(status & WDC_SR_WCCR)) {
 #ifdef SOFTWARE_REBOOT
 #ifdef ONLY_TESTING
 		printk(KERN_CRIT PFX "Would Reboot.\n");
@@ -371,12 +371,13 @@ static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
  */
 
 static ssize_t wdtpci_write(struct file *file, const char __user *buf,
-					size_t count, loff_t *ppos)
+						size_t count, loff_t *ppos)
 {
 	if (count) {
 		if (!nowayout) {
 			size_t i;
 
+			/* In case it was set long ago */
 			expect_close = 0;
 
 			for (i = 0; i != count; i++) {
@@ -406,10 +407,10 @@ static ssize_t wdtpci_write(struct file *file, const char __user *buf,
 static long wdtpci_ioctl(struct file *file, unsigned int cmd,
 							unsigned long arg)
 {
-	int new_heartbeat;
-	int status;
 	void __user *argp = (void __user *)arg;
 	int __user *p = argp;
+	int new_heartbeat;
+	int status;
 
 	static struct watchdog_info ident = {
 		.options =		WDIOF_SETTIMEOUT|
@@ -421,11 +422,12 @@ static long wdtpci_ioctl(struct file *file, unsigned int cmd,
 
 	/* Add options according to the card we have */
 	ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
-#ifdef CONFIG_WDT_501_PCI
-	ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
-	if (tachometer)
-		ident.options |= WDIOF_FANFAULT;
-#endif /* CONFIG_WDT_501_PCI */
+	if (type == 501) {
+		ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
+							WDIOF_POWEROVER);
+		if (tachometer)
+			ident.options |= WDIOF_FANFAULT;
+	}
 
 	switch (cmd) {
 	case WDIOC_GETSUPPORT:
@@ -503,7 +505,6 @@ static int wdtpci_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-#ifdef CONFIG_WDT_501_PCI
 /**
  *	wdtpci_temp_read:
  *	@file: file handle to the watchdog board
@@ -554,7 +555,6 @@ static int wdtpci_temp_release(struct inode *inode, struct file *file)
 {
 	return 0;
 }
-#endif /* CONFIG_WDT_501_PCI */
 
 /**
  *	notify_sys:
@@ -596,7 +596,6 @@ static struct miscdevice wdtpci_miscdev = {
 	.fops	= &wdtpci_fops,
 };
 
-#ifdef CONFIG_WDT_501_PCI
 static const struct file_operations wdtpci_temp_fops = {
 	.owner		= THIS_MODULE,
 	.llseek		= no_llseek,
@@ -610,7 +609,6 @@ static struct miscdevice temp_miscdev = {
 	.name	= "temperature",
 	.fops	= &wdtpci_temp_fops,
 };
-#endif /* CONFIG_WDT_501_PCI */
 
 /*
  *	The WDT card needs to learn about soft shutdowns in order to
@@ -633,6 +631,11 @@ static int __devinit wdtpci_init_one(struct pci_dev *dev,
 		return -ENODEV;
 	}
 
+	if (type != 500 && type != 501) {
+		printk(KERN_ERR PFX "unknown card type '%d'.\n", type);
+		return -ENODEV;
+	}
+
 	if (pci_enable_device(dev)) {
 		printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 		return -ENODEV;
@@ -678,15 +681,15 @@ static int __devinit wdtpci_init_one(struct pci_dev *dev,
 		goto out_irq;
 	}
 
-#ifdef CONFIG_WDT_501_PCI
-	ret = misc_register(&temp_miscdev);
-	if (ret) {
-		printk(KERN_ERR PFX
+	if (type == 501) {
+		ret = misc_register(&temp_miscdev);
+		if (ret) {
+			printk(KERN_ERR PFX
 			"cannot register miscdev on minor=%d (err=%d)\n",
-					TEMP_MINOR, ret);
-		goto out_rbt;
+							TEMP_MINOR, ret);
+			goto out_rbt;
+		}
 	}
-#endif /* CONFIG_WDT_501_PCI */
 
 	ret = misc_register(&wdtpci_miscdev);
 	if (ret) {
@@ -698,20 +701,18 @@ static int __devinit wdtpci_init_one(struct pci_dev *dev,
 
 	printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 		heartbeat, nowayout);
-#ifdef CONFIG_WDT_501_PCI
-	printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
+	if (type == 501)
+		printk(KERN_INFO "wdt: Fan Tachometer is %s\n",
 				(tachometer ? "Enabled" : "Disabled"));
-#endif /* CONFIG_WDT_501_PCI */
 
 	ret = 0;
 out:
 	return ret;
 
 out_misc:
-#ifdef CONFIG_WDT_501_PCI
-	misc_deregister(&temp_miscdev);
+	if (type == 501)
+		misc_deregister(&temp_miscdev);
 out_rbt:
-#endif /* CONFIG_WDT_501_PCI */
 	unregister_reboot_notifier(&wdtpci_notifier);
 out_irq:
 	free_irq(irq, &wdtpci_miscdev);
@@ -728,9 +729,8 @@ static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
 	/* here we assume only one device will ever have
 	 * been picked up and registered by probe function */
 	misc_deregister(&wdtpci_miscdev);
-#ifdef CONFIG_WDT_501_PCI
-	misc_deregister(&temp_miscdev);
-#endif /* CONFIG_WDT_501_PCI */
+	if (type == 501)
+		misc_deregister(&temp_miscdev);
 	unregister_reboot_notifier(&wdtpci_notifier);
 	free_irq(irq, &wdtpci_miscdev);
 	release_region(io, 16);