diff options
Diffstat (limited to 'drivers/watchdog/s3c2410_wdt.c')
| -rw-r--r-- | drivers/watchdog/s3c2410_wdt.c | 180 |
1 files changed, 39 insertions, 141 deletions
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index 30da88f47cd..a79e3840782 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -27,9 +27,8 @@ #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/timer.h> -#include <linux/miscdevice.h> +#include <linux/miscdevice.h> /* for MODULE_ALIAS_MISCDEV */ #include <linux/watchdog.h> -#include <linux/fs.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/interrupt.h> @@ -38,6 +37,7 @@ #include <linux/io.h> #include <linux/cpufreq.h> #include <linux/slab.h> +#include <linux/err.h> #include <mach/map.h> @@ -74,14 +74,12 @@ MODULE_PARM_DESC(soft_noboot, "Watchdog action, set to 1 to ignore reboots, " "0 to reboot (default 0)"); MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug (default 0)"); -static unsigned long open_lock; static struct device *wdt_dev; /* platform device attached to */ static struct resource *wdt_mem; static struct resource *wdt_irq; static struct clk *wdt_clock; static void __iomem *wdt_base; static unsigned int wdt_count; -static char expect_close; static DEFINE_SPINLOCK(wdt_lock); /* watchdog control routines */ @@ -93,11 +91,13 @@ static DEFINE_SPINLOCK(wdt_lock); /* functions */ -static void s3c2410wdt_keepalive(void) +static int s3c2410wdt_keepalive(struct watchdog_device *wdd) { spin_lock(&wdt_lock); writel(wdt_count, wdt_base + S3C2410_WTCNT); spin_unlock(&wdt_lock); + + return 0; } static void __s3c2410wdt_stop(void) @@ -109,14 +109,16 @@ static void __s3c2410wdt_stop(void) writel(wtcon, wdt_base + S3C2410_WTCON); } -static void s3c2410wdt_stop(void) +static int s3c2410wdt_stop(struct watchdog_device *wdd) { spin_lock(&wdt_lock); __s3c2410wdt_stop(); spin_unlock(&wdt_lock); + + return 0; } -static void s3c2410wdt_start(void) +static int s3c2410wdt_start(struct watchdog_device *wdd) { unsigned long wtcon; @@ -142,6 +144,8 @@ static void s3c2410wdt_start(void) writel(wdt_count, wdt_base + S3C2410_WTCNT); writel(wtcon, wdt_base + S3C2410_WTCON); spin_unlock(&wdt_lock); + + return 0; } static inline int s3c2410wdt_is_running(void) @@ -149,7 +153,7 @@ static inline int s3c2410wdt_is_running(void) return readl(wdt_base + S3C2410_WTCON) & S3C2410_WTCON_ENABLE; } -static int s3c2410wdt_set_heartbeat(int timeout) +static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeout) { unsigned long freq = clk_get_rate(wdt_clock); unsigned int count; @@ -182,8 +186,6 @@ static int s3c2410wdt_set_heartbeat(int timeout) } } - tmr_margin = timeout; - DBG("%s: timeout=%d, divisor=%d, count=%d (%08x)\n", __func__, timeout, divisor, count, count/divisor); @@ -201,70 +203,6 @@ static int s3c2410wdt_set_heartbeat(int timeout) return 0; } -/* - * /dev/watchdog handling - */ - -static int s3c2410wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &open_lock)) - return -EBUSY; - - if (nowayout) - __module_get(THIS_MODULE); - - expect_close = 0; - - /* start the timer */ - s3c2410wdt_start(); - return nonseekable_open(inode, file); -} - -static int s3c2410wdt_release(struct inode *inode, struct file *file) -{ - /* - * Shut off the timer. - * Lock it in if it's a module and we set nowayout - */ - - if (expect_close == 42) - s3c2410wdt_stop(); - else { - dev_err(wdt_dev, "Unexpected close, not stopping watchdog\n"); - s3c2410wdt_keepalive(); - } - expect_close = 0; - clear_bit(0, &open_lock); - return 0; -} - -static ssize_t s3c2410wdt_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - /* - * Refresh the timer. - */ - 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; - } - } - s3c2410wdt_keepalive(); - } - return len; -} - #define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE) static const struct watchdog_info s3c2410_wdt_ident = { @@ -273,53 +211,17 @@ static const struct watchdog_info s3c2410_wdt_ident = { .identity = "S3C2410 Watchdog", }; - -static long s3c2410wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_margin; - - switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &s3c2410_wdt_ident, - sizeof(s3c2410_wdt_ident)) ? -EFAULT : 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - case WDIOC_KEEPALIVE: - s3c2410wdt_keepalive(); - return 0; - case WDIOC_SETTIMEOUT: - if (get_user(new_margin, p)) - return -EFAULT; - if (s3c2410wdt_set_heartbeat(new_margin)) - return -EINVAL; - s3c2410wdt_keepalive(); - return put_user(tmr_margin, p); - case WDIOC_GETTIMEOUT: - return put_user(tmr_margin, p); - default: - return -ENOTTY; - } -} - -/* kernel interface */ - -static const struct file_operations s3c2410wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = s3c2410wdt_write, - .unlocked_ioctl = s3c2410wdt_ioctl, - .open = s3c2410wdt_open, - .release = s3c2410wdt_release, +static struct watchdog_ops s3c2410wdt_ops = { + .owner = THIS_MODULE, + .start = s3c2410wdt_start, + .stop = s3c2410wdt_stop, + .ping = s3c2410wdt_keepalive, + .set_timeout = s3c2410wdt_set_heartbeat, }; -static struct miscdevice s3c2410wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &s3c2410wdt_fops, +static struct watchdog_device s3c2410_wdd = { + .info = &s3c2410_wdt_ident, + .ops = &s3c2410wdt_ops, }; /* interrupt handler code */ @@ -328,7 +230,7 @@ static irqreturn_t s3c2410wdt_irq(int irqno, void *param) { dev_info(wdt_dev, "watchdog timer expired (irq)\n"); - s3c2410wdt_keepalive(); + s3c2410wdt_keepalive(&s3c2410_wdd); return IRQ_HANDLED; } @@ -349,14 +251,14 @@ static int s3c2410wdt_cpufreq_transition(struct notifier_block *nb, * the watchdog is running. */ - s3c2410wdt_keepalive(); + s3c2410wdt_keepalive(&s3c2410_wdd); } else if (val == CPUFREQ_POSTCHANGE) { - s3c2410wdt_stop(); + s3c2410wdt_stop(&s3c2410_wdd); - ret = s3c2410wdt_set_heartbeat(tmr_margin); + ret = s3c2410wdt_set_heartbeat(&s3c2410_wdd, s3c2410_wdd.timeout); if (ret >= 0) - s3c2410wdt_start(); + s3c2410wdt_start(&s3c2410_wdd); else goto err; } @@ -365,7 +267,8 @@ done: return 0; err: - dev_err(wdt_dev, "cannot set new value for timeout %d\n", tmr_margin); + dev_err(wdt_dev, "cannot set new value for timeout %d\n", + s3c2410_wdd.timeout); return ret; } @@ -396,10 +299,6 @@ static inline void s3c2410wdt_cpufreq_deregister(void) } #endif - - -/* device interface */ - static int __devinit s3c2410wdt_probe(struct platform_device *pdev) { struct device *dev; @@ -466,8 +365,8 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev) /* see if we can actually set the requested timer margin, and if * not, try the default value */ - if (s3c2410wdt_set_heartbeat(tmr_margin)) { - started = s3c2410wdt_set_heartbeat( + if (s3c2410wdt_set_heartbeat(&s3c2410_wdd, tmr_margin)) { + started = s3c2410wdt_set_heartbeat(&s3c2410_wdd, CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME); if (started == 0) @@ -479,22 +378,21 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev) "cannot start\n"); } - ret = misc_register(&s3c2410wdt_miscdev); + ret = watchdog_register_device(&s3c2410_wdd); if (ret) { - dev_err(dev, "cannot register miscdev on minor=%d (%d)\n", - WATCHDOG_MINOR, ret); + dev_err(dev, "cannot register watchdog (%d)\n", ret); goto err_cpufreq; } if (tmr_atboot && started == 0) { dev_info(dev, "starting watchdog timer\n"); - s3c2410wdt_start(); + s3c2410wdt_start(&s3c2410_wdd); } else if (!tmr_atboot) { /* if we're not enabling the watchdog, then ensure it is * disabled if it has been left running from the bootloader * or other source */ - s3c2410wdt_stop(); + s3c2410wdt_stop(&s3c2410_wdd); } /* print out a statement of readiness */ @@ -503,8 +401,8 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev) dev_info(dev, "watchdog %sactive, reset %sabled, irq %sabled\n", (wtcon & S3C2410_WTCON_ENABLE) ? "" : "in", - (wtcon & S3C2410_WTCON_RSTEN) ? "" : "dis", - (wtcon & S3C2410_WTCON_INTEN) ? "" : "en"); + (wtcon & S3C2410_WTCON_RSTEN) ? "en" : "dis", + (wtcon & S3C2410_WTCON_INTEN) ? "en" : "dis"); return 0; @@ -530,7 +428,7 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev) static int __devexit s3c2410wdt_remove(struct platform_device *dev) { - misc_deregister(&s3c2410wdt_miscdev); + watchdog_unregister_device(&s3c2410_wdd); s3c2410wdt_cpufreq_deregister(); @@ -550,7 +448,7 @@ static int __devexit s3c2410wdt_remove(struct platform_device *dev) static void s3c2410wdt_shutdown(struct platform_device *dev) { - s3c2410wdt_stop(); + s3c2410wdt_stop(&s3c2410_wdd); } #ifdef CONFIG_PM @@ -565,7 +463,7 @@ static int s3c2410wdt_suspend(struct platform_device *dev, pm_message_t state) wtdat_save = readl(wdt_base + S3C2410_WTDAT); /* Note that WTCNT doesn't need to be saved. */ - s3c2410wdt_stop(); + s3c2410wdt_stop(&s3c2410_wdd); return 0; } |