diff options
Diffstat (limited to 'drivers/watchdog/mpcore_wdt.c')
-rw-r--r-- | drivers/watchdog/mpcore_wdt.c | 73 |
1 files changed, 42 insertions, 31 deletions
diff --git a/drivers/watchdog/mpcore_wdt.c b/drivers/watchdog/mpcore_wdt.c index 009573b..2a9bfa8 100644 --- a/drivers/watchdog/mpcore_wdt.c +++ b/drivers/watchdog/mpcore_wdt.c @@ -29,9 +29,9 @@ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/platform_device.h> +#include <linux/uaccess.h> #include <asm/hardware/arm_twd.h> -#include <asm/uaccess.h> struct mpcore_wdt { unsigned long timer_alive; @@ -43,17 +43,20 @@ struct mpcore_wdt { }; static struct platform_device *mpcore_wdt_dev; - extern unsigned int mpcore_timer_rate; #define TIMER_MARGIN 60 static int mpcore_margin = TIMER_MARGIN; module_param(mpcore_margin, int, 0); -MODULE_PARM_DESC(mpcore_margin, "MPcore timer margin in seconds. (0<mpcore_margin<65536, default=" __MODULE_STRING(TIMER_MARGIN) ")"); +MODULE_PARM_DESC(mpcore_margin, + "MPcore timer margin in seconds. (0 < mpcore_margin < 65536, default=" + __MODULE_STRING(TIMER_MARGIN) ")"); 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) ")"); +MODULE_PARM_DESC(nowayout, + "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); #define ONLY_TESTING 0 static int mpcore_noboot = ONLY_TESTING; @@ -70,14 +73,12 @@ 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_printk(KERN_CRIT, wdt->dev, + "Triggered - Reboot ignored.\n"); /* Clear the interrupt on the watchdog */ writel(1, wdt->base + TWD_WDOG_INTSTAT); - return IRQ_HANDLED; } - return IRQ_NONE; } @@ -96,22 +97,26 @@ static void mpcore_wdt_keepalive(struct mpcore_wdt *wdt) count = (mpcore_timer_rate / 256) * mpcore_margin; /* Reload the counter */ + spin_lock(&wdt_lock); writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD); - wdt->perturb = wdt->perturb ? 0 : 1; + spin_unlock(&wdt_lock); } static void mpcore_wdt_stop(struct mpcore_wdt *wdt) { + spin_lock(&wdt_lock); writel(0x12345678, wdt->base + TWD_WDOG_DISABLE); writel(0x87654321, wdt->base + TWD_WDOG_DISABLE); writel(0x0, wdt->base + TWD_WDOG_CONTROL); + spin_unlock(&wdt_lock); } static void mpcore_wdt_start(struct mpcore_wdt *wdt) { dev_printk(KERN_INFO, wdt->dev, "enabling watchdog.\n"); + spin_lock(&wdt_lock); /* This loads the count register but does NOT start the count yet */ mpcore_wdt_keepalive(wdt); @@ -122,6 +127,7 @@ static void mpcore_wdt_start(struct mpcore_wdt *wdt) /* Enable watchdog - prescale=256, watchdog mode=1, enable=1 */ writel(0x0000FF09, wdt->base + TWD_WDOG_CONTROL); } + spin_unlock(&wdt_lock); } static int mpcore_wdt_set_heartbeat(int t) @@ -164,10 +170,11 @@ static int mpcore_wdt_release(struct inode *inode, struct file *file) * Shut off the timer. * Lock it in if it's a module and we set nowayout */ - if (wdt->expect_close == 42) { + if (wdt->expect_close == 42) mpcore_wdt_stop(wdt); - } else { - dev_printk(KERN_CRIT, wdt->dev, "unexpected close, not stopping watchdog!\n"); + else { + dev_printk(KERN_CRIT, wdt->dev, + "unexpected close, not stopping watchdog!\n"); mpcore_wdt_keepalive(wdt); } clear_bit(0, &wdt->timer_alive); @@ -175,7 +182,8 @@ static int mpcore_wdt_release(struct inode *inode, struct file *file) return 0; } -static ssize_t mpcore_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) +static ssize_t mpcore_wdt_write(struct file *file, const char *data, + size_t len, loff_t *ppos) { struct mpcore_wdt *wdt = file->private_data; @@ -210,8 +218,8 @@ static struct watchdog_info ident = { .identity = "MPcore Watchdog", }; -static int mpcore_wdt_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) +static long mpcore_wdt_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) { struct mpcore_wdt *wdt = file->private_data; int ret; @@ -235,6 +243,12 @@ static int mpcore_wdt_ioctl(struct inode *inode, struct file *file, ret = 0; break; + case WDIOC_GETSTATUS: + case WDIOC_GETBOOTSTATUS: + uarg.i = 0; + ret = 0; + break; + case WDIOC_SETOPTIONS: ret = -EINVAL; if (uarg.i & WDIOS_DISABLECARD) { @@ -247,12 +261,6 @@ static int mpcore_wdt_ioctl(struct inode *inode, struct file *file, } break; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - uarg.i = 0; - ret = 0; - break; - case WDIOC_KEEPALIVE: mpcore_wdt_keepalive(wdt); ret = 0; @@ -301,7 +309,7 @@ static const struct file_operations mpcore_wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = mpcore_wdt_write, - .ioctl = mpcore_wdt_ioctl, + .unlocked_ioctl = mpcore_wdt_ioctl, .open = mpcore_wdt_open, .release = mpcore_wdt_release, }; @@ -349,14 +357,17 @@ static int __devinit mpcore_wdt_probe(struct platform_device *dev) mpcore_wdt_miscdev.parent = &dev->dev; ret = misc_register(&mpcore_wdt_miscdev); if (ret) { - dev_printk(KERN_ERR, _dev, "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); + dev_printk(KERN_ERR, _dev, + "cannot register miscdev on minor=%d (err=%d)\n", + WATCHDOG_MINOR, ret); goto err_misc; } - ret = request_irq(wdt->irq, mpcore_wdt_fire, IRQF_DISABLED, "mpcore_wdt", wdt); + ret = request_irq(wdt->irq, mpcore_wdt_fire, IRQF_DISABLED, + "mpcore_wdt", wdt); if (ret) { - dev_printk(KERN_ERR, _dev, "cannot register IRQ%d for watchdog\n", wdt->irq); + dev_printk(KERN_ERR, _dev, + "cannot register IRQ%d for watchdog\n", wdt->irq); goto err_irq; } @@ -366,13 +377,13 @@ static int __devinit mpcore_wdt_probe(struct platform_device *dev) return 0; - err_irq: +err_irq: misc_deregister(&mpcore_wdt_miscdev); - err_misc: +err_misc: iounmap(wdt->base); - err_free: +err_free: kfree(wdt); - err_out: +err_out: return ret; } @@ -415,7 +426,7 @@ static int __init mpcore_wdt_init(void) */ if (mpcore_wdt_set_heartbeat(mpcore_margin)) { mpcore_wdt_set_heartbeat(TIMER_MARGIN); - printk(KERN_INFO "mpcore_margin value must be 0<mpcore_margin<65536, using %d\n", + printk(KERN_INFO "mpcore_margin value must be 0 < mpcore_margin < 65536, using %d\n", TIMER_MARGIN); } |