watchdog: add support for Broadcom BCM63xx built-in watchdog

This patch adds support for the Broadcom BCM63xx SoC built-in watchdog, it uses one of the BCM63xx hardware timer id. Signed-off-by: Miguel Gaio <miguel.gaio@efixo.com> Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

watchdog: add support for Broadcom BCM63xx built-in watchdog
This patch adds support for the Broadcom BCM63xx SoC built-in watchdog, it uses one of the BCM63xx hardware timer id. Signed-off-by: Miguel Gaio <miguel.gaio@efixo.com> Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Florian Fainelli · Wim Van Sebroeck
1 parent dee00abbbc
Showing 3 changed files with 361 additions and 0 deletions Side-by-side Diff
drivers/watchdog/Kconfig
drivers/watchdog/Makefile
drivers/watchdog/bcm63xx_wdt.c
@@ -917,6 +917,16 @@
 	  from the first interrupt, it is then only poked when the
 	  device is written.
  
+config BCM63XX_WDT
+	tristate "Broadcom BCM63xx hardware watchdog"
+	depends on BCM63XX
+	help
+	  Watchdog driver for the built in watchdog hardware in Broadcom
+	  BCM63xx SoC.
+
+	  To compile this driver as a loadable module, choose M here.
+	  The module will be called bcm63xx_wdt.
+
 # PARISC Architecture
  
 # POWERPC Architecture
@@ -109,6 +109,7 @@
  
 # MIPS Architecture
 obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
+obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
 obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
 obj-$(CONFIG_INDYDOG) += indydog.o
 obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
+/*
+ *  Broadcom BCM63xx SoC watchdog driver
+ *
+ *  Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
+ *  Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
+ *
+ *  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/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/resource.h>
+#include <linux/platform_device.h>
+
+#include <bcm63xx_cpu.h>
+#include <bcm63xx_io.h>
+#include <bcm63xx_regs.h>
+#include <bcm63xx_timer.h>
+
+#define PFX KBUILD_MODNAME
+
+#define WDT_HZ		50000000 /* Fclk */
+#define WDT_DEFAULT_TIME	30      /* seconds */
+#define WDT_MAX_TIME		256     /* seconds */
+
+static struct {
+	void __iomem *regs;
+	struct timer_list timer;
+	int default_ticks;
+	unsigned long inuse;
+	atomic_t ticks;
+} bcm63xx_wdt_device;
+
+static int expect_close;
+
+static int wdt_time = WDT_DEFAULT_TIME;
+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) ")");
+
+/* HW functions */
+static void bcm63xx_wdt_hw_start(void)
+{
+	bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
+	bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+	bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+}
+
+static void bcm63xx_wdt_hw_stop(void)
+{
+	bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+	bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+}
+
+static void bcm63xx_wdt_isr(void *data)
+{
+	struct pt_regs *regs = get_irq_regs();
+
+	die(PFX " fire", regs);
+}
+
+static void bcm63xx_timer_tick(unsigned long unused)
+{
+	if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
+		bcm63xx_wdt_hw_start();
+		mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
+	} else
+		printk(KERN_CRIT PFX ": watchdog will restart system\n");
+}
+
+static void bcm63xx_wdt_pet(void)
+{
+	atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
+}
+
+static void bcm63xx_wdt_start(void)
+{
+	bcm63xx_wdt_pet();
+	bcm63xx_timer_tick(0);
+}
+
+static void bcm63xx_wdt_pause(void)
+{
+	del_timer_sync(&bcm63xx_wdt_device.timer);
+	bcm63xx_wdt_hw_stop();
+}
+
+static int bcm63xx_wdt_settimeout(int new_time)
+{
+	if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
+		return -EINVAL;
+
+	wdt_time = new_time;
+
+	return 0;
+}
+
+static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
+		return -EBUSY;
+
+	bcm63xx_wdt_start();
+	return nonseekable_open(inode, file);
+}
+
+static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
+{
+	if (expect_close == 42)
+		bcm63xx_wdt_pause();
+	else {
+		printk(KERN_CRIT PFX
+			": Unexpected close, not stopping watchdog!\n");
+		bcm63xx_wdt_start();
+	}
+	clear_bit(0, &bcm63xx_wdt_device.inuse);
+	expect_close = 0;
+	return 0;
+}
+
+static ssize_t bcm63xx_wdt_write(struct file *file, const char *data,
+				size_t len, loff_t *ppos)
+{
+	if (len) {
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != len; i++) {
+				char c;
+				if (get_user(c, data + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 42;
+			}
+		}
+		bcm63xx_wdt_pet();
+	}
+	return len;
+}
+
+static struct watchdog_info bcm63xx_wdt_info = {
+	.identity       = PFX,
+	.options        = WDIOF_SETTIMEOUT |
+				WDIOF_KEEPALIVEPING |
+				WDIOF_MAGICCLOSE,
+};
+
+
+static long bcm63xx_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, &bcm63xx_wdt_info,
+			sizeof(bcm63xx_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) {
+			bcm63xx_wdt_pause();
+			retval = 0;
+		}
+		if (new_value & WDIOS_ENABLECARD) {
+			bcm63xx_wdt_start();
+			retval = 0;
+		}
+
+		return retval;
+
+	case WDIOC_KEEPALIVE:
+		bcm63xx_wdt_pet();
+		return 0;
+
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_value, p))
+			return -EFAULT;
+
+		if (bcm63xx_wdt_settimeout(new_value))
+			return -EINVAL;
+
+		bcm63xx_wdt_pet();
+
+	case WDIOC_GETTIMEOUT:
+		return put_user(wdt_time, p);
+
+	default:
+		return -ENOTTY;
+
+	}
+}
+
+static int bcm63xx_wdt_notify_sys(struct notifier_block *this,
+				unsigned long code, void *unused)
+{
+	if (code == SYS_DOWN || code == SYS_HALT)
+		bcm63xx_wdt_pause();
+	return NOTIFY_DONE;
+}
+
+static const struct file_operations bcm63xx_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= bcm63xx_wdt_write,
+	.unlocked_ioctl	= bcm63xx_wdt_ioctl,
+	.open		= bcm63xx_wdt_open,
+	.release	= bcm63xx_wdt_release,
+};
+
+static struct miscdevice bcm63xx_wdt_miscdev = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &bcm63xx_wdt_fops,
+};
+
+static struct notifier_block bcm63xx_wdt_notifier = {
+	.notifier_call = bcm63xx_wdt_notify_sys,
+};
+
+
+static int bcm63xx_wdt_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct resource *r;
+
+	setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L);
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(&pdev->dev, "failed to get resources\n");
+		return -ENODEV;
+	}
+
+	bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
+	if (!bcm63xx_wdt_device.regs) {
+		dev_err(&pdev->dev, "failed to remap I/O resources\n");
+		return -ENXIO;
+	}
+
+	ret = bcm63xx_timer_register(TIMER_WDT_ID, bcm63xx_wdt_isr, NULL);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register wdt timer isr\n");
+		goto unmap;
+	}
+
+	if (bcm63xx_wdt_settimeout(wdt_time)) {
+		bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
+		dev_info(&pdev->dev,
+			": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
+			wdt_time);
+	}
+
+	ret = register_reboot_notifier(&bcm63xx_wdt_notifier);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register reboot_notifier\n");
+		goto unregister_timer;
+	}
+
+	ret = misc_register(&bcm63xx_wdt_miscdev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to register watchdog device\n");
+		goto unregister_reboot_notifier;
+	}
+
+	dev_info(&pdev->dev, " started, timer margin: %d sec\n",
+						WDT_DEFAULT_TIME);
+
+	return 0;
+
+unregister_reboot_notifier:
+	unregister_reboot_notifier(&bcm63xx_wdt_notifier);
+unregister_timer:
+	bcm63xx_timer_unregister(TIMER_WDT_ID);
+unmap:
+	iounmap(bcm63xx_wdt_device.regs);
+	return ret;
+}
+
+static int bcm63xx_wdt_remove(struct platform_device *pdev)
+{
+	if (!nowayout)
+		bcm63xx_wdt_pause();
+
+	misc_deregister(&bcm63xx_wdt_miscdev);
+
+	iounmap(bcm63xx_wdt_device.regs);
+
+	unregister_reboot_notifier(&bcm63xx_wdt_notifier);
+	bcm63xx_timer_unregister(TIMER_WDT_ID);
+
+	return 0;
+}
+
+static struct platform_driver bcm63xx_wdt = {
+	.probe	= bcm63xx_wdt_probe,
+	.remove = bcm63xx_wdt_remove,
+	.driver = {
+		.name = "bcm63xx-wdt",
+	}
+};
+
+static int __init bcm63xx_wdt_init(void)
+{
+	return platform_driver_register(&bcm63xx_wdt);
+}
+
+static void __exit bcm63xx_wdt_exit(void)
+{
+	platform_driver_unregister(&bcm63xx_wdt);
+}
+
+module_init(bcm63xx_wdt_init);
+module_exit(bcm63xx_wdt_exit);
+
+MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:bcm63xx-wdt");
...	...	@@ -917,6 +917,16 @@
917	917	from the first interrupt, it is then only poked when the
918	918	device is written.
919	919
	920	+config BCM63XX_WDT
	921	+ tristate "Broadcom BCM63xx hardware watchdog"
	922	+ depends on BCM63XX
	923	+ help
	924	+ Watchdog driver for the built in watchdog hardware in Broadcom
	925	+ BCM63xx SoC.
	926	+
	927	+ To compile this driver as a loadable module, choose M here.
	928	+ The module will be called bcm63xx_wdt.
	929	+
920	930	# PARISC Architecture
921	931
922	932	# POWERPC Architecture
...	...	@@ -109,6 +109,7 @@
109	109
110	110	# MIPS Architecture
111	111	obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
	112	+obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
112	113	obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
113	114	obj-$(CONFIG_INDYDOG) += indydog.o
114	115	obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
	1	+/*
	2	+ * Broadcom BCM63xx SoC watchdog driver
	3	+ *
	4	+ * Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
	5	+ * Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
	6	+ *
	7	+ * This program is free software; you can redistribute it and/or
	8	+ * modify it under the terms of the GNU General Public License
	9	+ * as published by the Free Software Foundation; either version
	10	+ * 2 of the License, or (at your option) any later version.
	11	+ */
	12	+
	13	+#include <linux/bitops.h>
	14	+#include <linux/errno.h>
	15	+#include <linux/fs.h>
	16	+#include <linux/init.h>
	17	+#include <linux/kernel.h>
	18	+#include <linux/miscdevice.h>
	19	+#include <linux/module.h>
	20	+#include <linux/moduleparam.h>
	21	+#include <linux/reboot.h>
	22	+#include <linux/types.h>
	23	+#include <linux/uaccess.h>
	24	+#include <linux/watchdog.h>
	25	+#include <linux/timer.h>
	26	+#include <linux/jiffies.h>
	27	+#include <linux/interrupt.h>
	28	+#include <linux/ptrace.h>
	29	+#include <linux/resource.h>
	30	+#include <linux/platform_device.h>
	31	+
	32	+#include <bcm63xx_cpu.h>
	33	+#include <bcm63xx_io.h>
	34	+#include <bcm63xx_regs.h>
	35	+#include <bcm63xx_timer.h>
	36	+
	37	+#define PFX KBUILD_MODNAME
	38	+
	39	+#define WDT_HZ 50000000 /* Fclk */
	40	+#define WDT_DEFAULT_TIME 30 /* seconds */
	41	+#define WDT_MAX_TIME 256 /* seconds */
	42	+
	43	+static struct {
	44	+ void __iomem *regs;
	45	+ struct timer_list timer;
	46	+ int default_ticks;
	47	+ unsigned long inuse;
	48	+ atomic_t ticks;
	49	+} bcm63xx_wdt_device;
	50	+
	51	+static int expect_close;
	52	+
	53	+static int wdt_time = WDT_DEFAULT_TIME;
	54	+static int nowayout = WATCHDOG_NOWAYOUT;
	55	+module_param(nowayout, int, 0);
	56	+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
	57	+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	58	+
	59	+/* HW functions */
	60	+static void bcm63xx_wdt_hw_start(void)
	61	+{
	62	+ bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
	63	+ bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
	64	+ bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
	65	+}
	66	+
	67	+static void bcm63xx_wdt_hw_stop(void)
	68	+{
	69	+ bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
	70	+ bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
	71	+}
	72	+
	73	+static void bcm63xx_wdt_isr(void *data)
	74	+{
	75	+ struct pt_regs *regs = get_irq_regs();
	76	+
	77	+ die(PFX " fire", regs);
	78	+}
	79	+
	80	+static void bcm63xx_timer_tick(unsigned long unused)
	81	+{
	82	+ if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
	83	+ bcm63xx_wdt_hw_start();
	84	+ mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
	85	+ } else
	86	+ printk(KERN_CRIT PFX ": watchdog will restart system\n");
	87	+}
	88	+
	89	+static void bcm63xx_wdt_pet(void)
	90	+{
	91	+ atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
	92	+}
	93	+
	94	+static void bcm63xx_wdt_start(void)
	95	+{
	96	+ bcm63xx_wdt_pet();
	97	+ bcm63xx_timer_tick(0);
	98	+}
	99	+
	100	+static void bcm63xx_wdt_pause(void)
	101	+{
	102	+ del_timer_sync(&bcm63xx_wdt_device.timer);
	103	+ bcm63xx_wdt_hw_stop();
	104	+}
	105	+
	106	+static int bcm63xx_wdt_settimeout(int new_time)
	107	+{
	108	+ if ((new_time <= 0) \|\| (new_time > WDT_MAX_TIME))
	109	+ return -EINVAL;
	110	+
	111	+ wdt_time = new_time;
	112	+
	113	+ return 0;
	114	+}
	115	+
	116	+static int bcm63xx_wdt_open(struct inode inode, struct file file)
	117	+{
	118	+ if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
	119	+ return -EBUSY;
	120	+
	121	+ bcm63xx_wdt_start();
	122	+ return nonseekable_open(inode, file);
	123	+}
	124	+
	125	+static int bcm63xx_wdt_release(struct inode inode, struct file file)
	126	+{
	127	+ if (expect_close == 42)
	128	+ bcm63xx_wdt_pause();
	129	+ else {
	130	+ printk(KERN_CRIT PFX
	131	+ ": Unexpected close, not stopping watchdog!\n");
	132	+ bcm63xx_wdt_start();
	133	+ }
	134	+ clear_bit(0, &bcm63xx_wdt_device.inuse);
	135	+ expect_close = 0;
	136	+ return 0;
	137	+}
	138	+
	139	+static ssize_t bcm63xx_wdt_write(struct file file, const char data,
	140	+ size_t len, loff_t *ppos)
	141	+{
	142	+ if (len) {
	143	+ if (!nowayout) {
	144	+ size_t i;
	145	+
	146	+ /* In case it was set long ago */
	147	+ expect_close = 0;
	148	+
	149	+ for (i = 0; i != len; i++) {
	150	+ char c;
	151	+ if (get_user(c, data + i))
	152	+ return -EFAULT;
	153	+ if (c == 'V')
	154	+ expect_close = 42;
	155	+ }
	156	+ }
	157	+ bcm63xx_wdt_pet();
	158	+ }
	159	+ return len;
	160	+}
	161	+
	162	+static struct watchdog_info bcm63xx_wdt_info = {
	163	+ .identity = PFX,
	164	+ .options = WDIOF_SETTIMEOUT \|
	165	+ WDIOF_KEEPALIVEPING \|
	166	+ WDIOF_MAGICCLOSE,
	167	+};
	168	+
	169	+
	170	+static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
	171	+ unsigned long arg)
	172	+{
	173	+ void __user argp = (void __user )arg;
	174	+ int __user *p = argp;
	175	+ int new_value, retval = -EINVAL;
	176	+
	177	+ switch (cmd) {
	178	+ case WDIOC_GETSUPPORT:
	179	+ return copy_to_user(argp, &bcm63xx_wdt_info,
	180	+ sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0;
	181	+
	182	+ case WDIOC_GETSTATUS:
	183	+ case WDIOC_GETBOOTSTATUS:
	184	+ return put_user(0, p);
	185	+
	186	+ case WDIOC_SETOPTIONS:
	187	+ if (get_user(new_value, p))
	188	+ return -EFAULT;
	189	+
	190	+ if (new_value & WDIOS_DISABLECARD) {
	191	+ bcm63xx_wdt_pause();
	192	+ retval = 0;
	193	+ }
	194	+ if (new_value & WDIOS_ENABLECARD) {
	195	+ bcm63xx_wdt_start();
	196	+ retval = 0;
	197	+ }
	198	+
	199	+ return retval;
	200	+
	201	+ case WDIOC_KEEPALIVE:
	202	+ bcm63xx_wdt_pet();
	203	+ return 0;
	204	+
	205	+ case WDIOC_SETTIMEOUT:
	206	+ if (get_user(new_value, p))
	207	+ return -EFAULT;
	208	+
	209	+ if (bcm63xx_wdt_settimeout(new_value))
	210	+ return -EINVAL;
	211	+
	212	+ bcm63xx_wdt_pet();
	213	+
	214	+ case WDIOC_GETTIMEOUT:
	215	+ return put_user(wdt_time, p);
	216	+
	217	+ default:
	218	+ return -ENOTTY;
	219	+
	220	+ }
	221	+}
	222	+
	223	+static int bcm63xx_wdt_notify_sys(struct notifier_block *this,
	224	+ unsigned long code, void *unused)
	225	+{
	226	+ if (code == SYS_DOWN \|\| code == SYS_HALT)
	227	+ bcm63xx_wdt_pause();
	228	+ return NOTIFY_DONE;
	229	+}
	230	+
	231	+static const struct file_operations bcm63xx_wdt_fops = {
	232	+ .owner = THIS_MODULE,
	233	+ .llseek = no_llseek,
	234	+ .write = bcm63xx_wdt_write,
	235	+ .unlocked_ioctl = bcm63xx_wdt_ioctl,
	236	+ .open = bcm63xx_wdt_open,
	237	+ .release = bcm63xx_wdt_release,
	238	+};
	239	+
	240	+static struct miscdevice bcm63xx_wdt_miscdev = {
	241	+ .minor = WATCHDOG_MINOR,
	242	+ .name = "watchdog",
	243	+ .fops = &bcm63xx_wdt_fops,
	244	+};
	245	+
	246	+static struct notifier_block bcm63xx_wdt_notifier = {
	247	+ .notifier_call = bcm63xx_wdt_notify_sys,
	248	+};
	249	+
	250	+
	251	+static int bcm63xx_wdt_probe(struct platform_device *pdev)
	252	+{
	253	+ int ret;
	254	+ struct resource *r;
	255	+
	256	+ setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L);
	257	+
	258	+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	259	+ if (!r) {
	260	+ dev_err(&pdev->dev, "failed to get resources\n");
	261	+ return -ENODEV;
	262	+ }
	263	+
	264	+ bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
	265	+ if (!bcm63xx_wdt_device.regs) {
	266	+ dev_err(&pdev->dev, "failed to remap I/O resources\n");
	267	+ return -ENXIO;
	268	+ }
	269	+
	270	+ ret = bcm63xx_timer_register(TIMER_WDT_ID, bcm63xx_wdt_isr, NULL);
	271	+ if (ret < 0) {
	272	+ dev_err(&pdev->dev, "failed to register wdt timer isr\n");
	273	+ goto unmap;
	274	+ }
	275	+
	276	+ if (bcm63xx_wdt_settimeout(wdt_time)) {
	277	+ bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
	278	+ dev_info(&pdev->dev,
	279	+ ": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
	280	+ wdt_time);
	281	+ }
	282	+
	283	+ ret = register_reboot_notifier(&bcm63xx_wdt_notifier);
	284	+ if (ret) {
	285	+ dev_err(&pdev->dev, "failed to register reboot_notifier\n");
	286	+ goto unregister_timer;
	287	+ }
	288	+
	289	+ ret = misc_register(&bcm63xx_wdt_miscdev);
	290	+ if (ret < 0) {
	291	+ dev_err(&pdev->dev, "failed to register watchdog device\n");
	292	+ goto unregister_reboot_notifier;
	293	+ }
	294	+
	295	+ dev_info(&pdev->dev, " started, timer margin: %d sec\n",
	296	+ WDT_DEFAULT_TIME);
	297	+
	298	+ return 0;
	299	+
	300	+unregister_reboot_notifier:
	301	+ unregister_reboot_notifier(&bcm63xx_wdt_notifier);
	302	+unregister_timer:
	303	+ bcm63xx_timer_unregister(TIMER_WDT_ID);
	304	+unmap:
	305	+ iounmap(bcm63xx_wdt_device.regs);
	306	+ return ret;
	307	+}
	308	+
	309	+static int bcm63xx_wdt_remove(struct platform_device *pdev)
	310	+{
	311	+ if (!nowayout)
	312	+ bcm63xx_wdt_pause();
	313	+
	314	+ misc_deregister(&bcm63xx_wdt_miscdev);
	315	+
	316	+ iounmap(bcm63xx_wdt_device.regs);
	317	+
	318	+ unregister_reboot_notifier(&bcm63xx_wdt_notifier);
	319	+ bcm63xx_timer_unregister(TIMER_WDT_ID);
	320	+
	321	+ return 0;
	322	+}
	323	+
	324	+static struct platform_driver bcm63xx_wdt = {
	325	+ .probe = bcm63xx_wdt_probe,
	326	+ .remove = bcm63xx_wdt_remove,
	327	+ .driver = {
	328	+ .name = "bcm63xx-wdt",
	329	+ }
	330	+};
	331	+
	332	+static int __init bcm63xx_wdt_init(void)
	333	+{
	334	+ return platform_driver_register(&bcm63xx_wdt);
	335	+}
	336	+
	337	+static void __exit bcm63xx_wdt_exit(void)
	338	+{
	339	+ platform_driver_unregister(&bcm63xx_wdt);
	340	+}
	341	+
	342	+module_init(bcm63xx_wdt_init);
	343	+module_exit(bcm63xx_wdt_exit);
	344	+
	345	+MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
	346	+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
	347	+MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
	348	+MODULE_LICENSE("GPL");
	349	+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
	350	+MODULE_ALIAS("platform:bcm63xx-wdt");