diff options
Diffstat (limited to 'drivers/watchdog/bfin_wdt.c')
| -rw-r--r-- | drivers/watchdog/bfin_wdt.c | 69 |
1 files changed, 24 insertions, 45 deletions
diff --git a/drivers/watchdog/bfin_wdt.c b/drivers/watchdog/bfin_wdt.c index c7b3f9df2317..9c7ccd1e9088 100644 --- a/drivers/watchdog/bfin_wdt.c +++ b/drivers/watchdog/bfin_wdt.c @@ -1,9 +1,8 @@ /* * Blackfin On-Chip Watchdog Driver - * Supports BF53[123]/BF53[467]/BF54[2489]/BF561 * * Originally based on softdog.c - * Copyright 2006-2007 Analog Devices Inc. + * Copyright 2006-2010 Analog Devices Inc. * Copyright 2006-2007 Michele d'Amico * Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk> * @@ -20,8 +19,6 @@ #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/fs.h> -#include <linux/notifier.h> -#include <linux/reboot.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/uaccess.h> @@ -75,7 +72,7 @@ static unsigned int timeout = WATCHDOG_TIMEOUT; static int nowayout = WATCHDOG_NOWAYOUT; -static struct watchdog_info bfin_wdt_info; +static const struct watchdog_info bfin_wdt_info; static unsigned long open_check; static char expect_close; static DEFINE_SPINLOCK(bfin_wdt_spinlock); @@ -137,13 +134,15 @@ static int bfin_wdt_running(void) */ static int bfin_wdt_set_timeout(unsigned long t) { - u32 cnt; + u32 cnt, max_t, sclk; unsigned long flags; - stampit(); + sclk = get_sclk(); + max_t = -1 / sclk; + cnt = t * sclk; + stamp("maxtimeout=%us newtimeout=%lus (cnt=%#x)", max_t, t, cnt); - cnt = t * get_sclk(); - if (cnt < get_sclk()) { + if (t > max_t) { printk(KERN_WARNING PFX "timeout value is too large\n"); return -EINVAL; } @@ -308,26 +307,6 @@ static long bfin_wdt_ioctl(struct file *file, } } -/** - * bfin_wdt_notify_sys - Notifier Handler - * @this: notifier block - * @code: notifier event - * @unused: unused - * - * Handles specific events, such as turning off the watchdog during a - * shutdown event. - */ -static int bfin_wdt_notify_sys(struct notifier_block *this, - unsigned long code, void *unused) -{ - stampit(); - - if (code == SYS_DOWN || code == SYS_HALT) - bfin_wdt_stop(); - - return NOTIFY_DONE; -} - #ifdef CONFIG_PM static int state_before_suspend; @@ -387,40 +366,28 @@ static struct miscdevice bfin_wdt_miscdev = { .fops = &bfin_wdt_fops, }; -static struct watchdog_info bfin_wdt_info = { +static const struct watchdog_info bfin_wdt_info = { .identity = "Blackfin Watchdog", .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, }; -static struct notifier_block bfin_wdt_notifier = { - .notifier_call = bfin_wdt_notify_sys, -}; - /** * bfin_wdt_probe - Initialize module * - * Registers the misc device and notifier handler. Actual device + * Registers the misc device. Actual device * initialization is handled by bfin_wdt_open(). */ static int __devinit bfin_wdt_probe(struct platform_device *pdev) { int ret; - ret = register_reboot_notifier(&bfin_wdt_notifier); - if (ret) { - pr_devinit(KERN_ERR PFX - "cannot register reboot notifier (err=%d)\n", ret); - return ret; - } - ret = misc_register(&bfin_wdt_miscdev); if (ret) { pr_devinit(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); - unregister_reboot_notifier(&bfin_wdt_notifier); return ret; } @@ -433,21 +400,33 @@ static int __devinit bfin_wdt_probe(struct platform_device *pdev) /** * bfin_wdt_remove - Initialize module * - * Unregisters the misc device and notifier handler. Actual device + * Unregisters the misc device. Actual device * deinitialization is handled by bfin_wdt_close(). */ static int __devexit bfin_wdt_remove(struct platform_device *pdev) { misc_deregister(&bfin_wdt_miscdev); - unregister_reboot_notifier(&bfin_wdt_notifier); return 0; } +/** + * bfin_wdt_shutdown - Soft Shutdown Handler + * + * Handles the soft shutdown event. + */ +static void bfin_wdt_shutdown(struct platform_device *pdev) +{ + stampit(); + + bfin_wdt_stop(); +} + static struct platform_device *bfin_wdt_device; static struct platform_driver bfin_wdt_driver = { .probe = bfin_wdt_probe, .remove = __devexit_p(bfin_wdt_remove), + .shutdown = bfin_wdt_shutdown, .suspend = bfin_wdt_suspend, .resume = bfin_wdt_resume, .driver = { |