X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fwatchdog%2Fks8695_wdt.c;h=0b798fdaa378eccd53e39c5ab1fa538e19388b03;hb=8c5a1cf0ad3ac5fcdf51314a63b16a440870f6a2;hp=df5a6b811ccd4d5f0004feeb3e6d856267de4892;hpb=e48d199ba10bb8267f491a3a585ca4a833e950a4;p=linux-2.6-omap-h63xx.git diff --git a/drivers/watchdog/ks8695_wdt.c b/drivers/watchdog/ks8695_wdt.c index df5a6b811cc..0b798fdaa37 100644 --- a/drivers/watchdog/ks8695_wdt.c +++ b/drivers/watchdog/ks8695_wdt.c @@ -19,10 +19,9 @@ #include #include #include -#include -#include -#include - +#include +#include +#include #define WDT_DEFAULT_TIME 5 /* seconds */ #define WDT_MAX_TIME 171 /* seconds */ @@ -31,38 +30,44 @@ 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) ")"); +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) ")"); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); #endif static unsigned long ks8695wdt_busy; +static spinlock_t ks8695_lock; /* ......................................................................... */ /* * Disable the watchdog. */ -static void inline ks8695_wdt_stop(void) +static inline void ks8695_wdt_stop(void) { unsigned long tmcon; + spin_lock(&ks8695_lock); /* disable timer0 */ tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON); __raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON); + spin_unlock(&ks8695_lock); } /* * Enable and reset the watchdog. */ -static void inline ks8695_wdt_start(void) +static inline void ks8695_wdt_start(void) { unsigned long tmcon; unsigned long tval = wdt_time * CLOCK_TICK_RATE; + spin_lock(&ks8695_lock); /* disable timer0 */ tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON); __raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON); @@ -73,19 +78,22 @@ static void inline ks8695_wdt_start(void) /* re-enable timer0 */ tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON); __raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON); + spin_unlock(&ks8695_lock); } /* * Reload the watchdog timer. (ie, pat the watchdog) */ -static void inline ks8695_wdt_reload(void) +static inline void ks8695_wdt_reload(void) { unsigned long tmcon; + spin_lock(&ks8695_lock); /* disable, then re-enable timer0 */ tmcon = __raw_readl(KS8695_TMR_VA + KS8695_TMCON); __raw_writel(tmcon & ~TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON); __raw_writel(tmcon | TMCON_T0EN, KS8695_TMR_VA + KS8695_TMCON); + spin_unlock(&ks8695_lock); } /* @@ -102,7 +110,8 @@ static int ks8695_wdt_settimeout(int new_time) if ((new_time <= 0) || (new_time > WDT_MAX_TIME)) return -EINVAL; - /* Set new watchdog time. It will be used when ks8695_wdt_start() is called. */ + /* Set new watchdog time. It will be used when + ks8695_wdt_start() is called. */ wdt_time = new_time; return 0; } @@ -128,9 +137,9 @@ static int ks8695_wdt_open(struct inode *inode, struct file *file) */ static int ks8695_wdt_close(struct inode *inode, struct file *file) { + /* Disable the watchdog when file is closed */ if (!nowayout) - ks8695_wdt_stop(); /* Disable the watchdog when file is closed */ - + ks8695_wdt_stop(); clear_bit(0, &ks8695wdt_busy); return 0; } @@ -143,60 +152,52 @@ static struct watchdog_info ks8695_wdt_info = { /* * Handle commands from user-space. */ -static int ks8695_wdt_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) +static long ks8695_wdt_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; int new_value; - switch(cmd) { - case WDIOC_KEEPALIVE: - ks8695_wdt_reload(); /* pat the watchdog */ - return 0; - - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ks8695_wdt_info, sizeof(ks8695_wdt_info)) ? -EFAULT : 0; - - case WDIOC_SETTIMEOUT: - if (get_user(new_value, p)) - return -EFAULT; - - if (ks8695_wdt_settimeout(new_value)) - return -EINVAL; - - /* Enable new time value */ + switch (cmd) { + case WDIOC_GETSUPPORT: + return copy_to_user(argp, &ks8695_wdt_info, + sizeof(ks8695_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) + ks8695_wdt_stop(); + if (new_value & WDIOS_ENABLECARD) ks8695_wdt_start(); - - /* Return current value */ - return put_user(wdt_time, p); - - case WDIOC_GETTIMEOUT: - return put_user(wdt_time, p); - - 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) - ks8695_wdt_stop(); - if (new_value & WDIOS_ENABLECARD) - ks8695_wdt_start(); - return 0; - - default: - return -ENOTTY; + return 0; + case WDIOC_KEEPALIVE: + ks8695_wdt_reload(); /* pat the watchdog */ + return 0; + case WDIOC_SETTIMEOUT: + if (get_user(new_value, p)) + return -EFAULT; + if (ks8695_wdt_settimeout(new_value)) + return -EINVAL; + /* Enable new time value */ + ks8695_wdt_start(); + /* Return current value */ + return put_user(wdt_time, p); + case WDIOC_GETTIMEOUT: + return put_user(wdt_time, p); + default: + return -ENOTTY; } } /* * Pat the watchdog whenever device is written to. */ -static ssize_t ks8695_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) +static ssize_t ks8695_wdt_write(struct file *file, const char *data, + size_t len, loff_t *ppos) { ks8695_wdt_reload(); /* pat the watchdog */ return len; @@ -207,7 +208,7 @@ static ssize_t ks8695_wdt_write(struct file *file, const char *data, size_t len, static const struct file_operations ks8695wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, - .ioctl = ks8695_wdt_ioctl, + .unlocked_ioctl = ks8695_wdt_ioctl, .open = ks8695_wdt_open, .release = ks8695_wdt_close, .write = ks8695_wdt_write, @@ -231,7 +232,8 @@ static int __init ks8695wdt_probe(struct platform_device *pdev) if (res) return res; - printk("KS8695 Watchdog Timer enabled (%d seconds%s)\n", wdt_time, nowayout ? ", nowayout" : ""); + printk(KERN_INFO "KS8695 Watchdog Timer enabled (%d seconds%s)\n", + wdt_time, nowayout ? ", nowayout" : ""); return 0; } @@ -285,12 +287,14 @@ static struct platform_driver ks8695wdt_driver = { static int __init ks8695_wdt_init(void) { - /* Check that the heartbeat value is within range; if not reset to the default */ + spin_lock_init(&ks8695_lock); + /* Check that the heartbeat value is within range; + if not reset to the default */ if (ks8695_wdt_settimeout(wdt_time)) { ks8695_wdt_settimeout(WDT_DEFAULT_TIME); - pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i, using %d\n", wdt_time, WDT_MAX_TIME); + pr_info("ks8695_wdt: wdt_time value must be 1 <= wdt_time <= %i, using %d\n", + wdt_time, WDT_MAX_TIME); } - return platform_driver_register(&ks8695wdt_driver); }