diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/watchdog/orion_wdt.c | 203 |
2 files changed, 51 insertions, 153 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 277ecbc..46e258c 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -279,6 +279,7 @@ config DAVINCI_WATCHDOG config ORION_WATCHDOG tristate "Orion watchdog" depends on ARCH_ORION5X || ARCH_KIRKWOOD + select WATCHDOG_CORE help Say Y here if to include support for the watchdog timer in the Marvell Orion5x and Kirkwood ARM SoCs. diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c index 0f57369..a73bea4 100644 --- a/drivers/watchdog/orion_wdt.c +++ b/drivers/watchdog/orion_wdt.c @@ -16,22 +16,21 @@ #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> -#include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/platform_device.h> #include <linux/watchdog.h> #include <linux/init.h> -#include <linux/uaccess.h> #include <linux/io.h> #include <linux/spinlock.h> #include <linux/clk.h> +#include <linux/err.h> #include <mach/bridge-regs.h> /* * Watchdog timer block registers. */ #define TIMER_CTRL 0x0000 -#define WDT_EN 0x0010 +#define WDT_EN 0x0010 #define WDT_VAL 0x0024 #define WDT_MAX_CYCLE_COUNT 0xffffffff @@ -44,27 +43,27 @@ static unsigned int wdt_max_duration; /* (seconds) */ static struct clk *clk; static unsigned int wdt_tclk; static void __iomem *wdt_reg; -static unsigned long wdt_status; static DEFINE_SPINLOCK(wdt_lock); -static void orion_wdt_ping(void) +static int orion_wdt_ping(struct watchdog_device *wdt_dev) { spin_lock(&wdt_lock); /* Reload watchdog duration */ - writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); + writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); spin_unlock(&wdt_lock); + return 0; } -static void orion_wdt_enable(void) +static int orion_wdt_start(struct watchdog_device *wdt_dev) { u32 reg; spin_lock(&wdt_lock); /* Set watchdog duration */ - writel(wdt_tclk * heartbeat, wdt_reg + WDT_VAL); + writel(wdt_tclk * wdt_dev->timeout, wdt_reg + WDT_VAL); /* Clear watchdog timer interrupt */ reg = readl(BRIDGE_CAUSE); @@ -82,9 +81,10 @@ static void orion_wdt_enable(void) writel(reg, RSTOUTn_MASK); spin_unlock(&wdt_lock); + return 0; } -static void orion_wdt_disable(void) +static int orion_wdt_stop(struct watchdog_device *wdt_dev) { u32 reg; @@ -101,139 +101,44 @@ static void orion_wdt_disable(void) writel(reg, wdt_reg + TIMER_CTRL); spin_unlock(&wdt_lock); + return 0; } -static int orion_wdt_get_timeleft(int *time_left) +static unsigned int orion_wdt_get_timeleft(struct watchdog_device *wdt_dev) { + unsigned int time_left; + spin_lock(&wdt_lock); - *time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk; + time_left = readl(wdt_reg + WDT_VAL) / wdt_tclk; spin_unlock(&wdt_lock); - return 0; -} -static int orion_wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(WDT_IN_USE, &wdt_status)) - return -EBUSY; - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - orion_wdt_enable(); - return nonseekable_open(inode, file); + return time_left; } -static ssize_t orion_wdt_write(struct file *file, const char *data, - size_t len, loff_t *ppos) +static int orion_wdt_set_timeout(struct watchdog_device *wdt_dev, + unsigned int timeout) { - if (len) { - if (!nowayout) { - size_t i; - - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - for (i = 0; i != len; i++) { - char c; - - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - set_bit(WDT_OK_TO_CLOSE, &wdt_status); - } - } - orion_wdt_ping(); - } - return len; -} - -static int orion_wdt_settimeout(int new_time) -{ - if ((new_time <= 0) || (new_time > wdt_max_duration)) - return -EINVAL; - - /* Set new watchdog time to be used when - * orion_wdt_enable() or orion_wdt_ping() is called. */ - heartbeat = new_time; + wdt_dev->timeout = timeout; return 0; } -static const struct watchdog_info ident = { - .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | - WDIOF_KEEPALIVEPING, - .identity = "Orion Watchdog", +static const struct watchdog_info orion_wdt_info = { + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, + .identity = "Orion Watchdog", }; -static long orion_wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - int ret = -ENOTTY; - int time; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = copy_to_user((struct watchdog_info *)arg, &ident, - sizeof(ident)) ? -EFAULT : 0; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - ret = put_user(0, (int *)arg); - break; - - case WDIOC_KEEPALIVE: - orion_wdt_ping(); - ret = 0; - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(time, (int *)arg); - if (ret) - break; - - if (orion_wdt_settimeout(time)) { - ret = -EINVAL; - break; - } - orion_wdt_ping(); - /* Fall through */ - - case WDIOC_GETTIMEOUT: - ret = put_user(heartbeat, (int *)arg); - break; - - case WDIOC_GETTIMELEFT: - if (orion_wdt_get_timeleft(&time)) { - ret = -EINVAL; - break; - } - ret = put_user(time, (int *)arg); - break; - } - return ret; -} - -static int orion_wdt_release(struct inode *inode, struct file *file) -{ - if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) - orion_wdt_disable(); - else - pr_crit("Device closed unexpectedly - timer will not stop\n"); - clear_bit(WDT_IN_USE, &wdt_status); - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - return 0; -} - - -static const struct file_operations orion_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = orion_wdt_write, - .unlocked_ioctl = orion_wdt_ioctl, - .open = orion_wdt_open, - .release = orion_wdt_release, +static const struct watchdog_ops orion_wdt_ops = { + .owner = THIS_MODULE, + .start = orion_wdt_start, + .stop = orion_wdt_stop, + .ping = orion_wdt_ping, + .set_timeout = orion_wdt_set_timeout, + .get_timeleft = orion_wdt_get_timeleft, }; -static struct miscdevice orion_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &orion_wdt_fops, +static struct watchdog_device orion_wdt = { + .info = &orion_wdt_info, + .ops = &orion_wdt_ops, }; static int __devinit orion_wdt_probe(struct platform_device *pdev) @@ -241,29 +146,34 @@ static int __devinit orion_wdt_probe(struct platform_device *pdev) struct resource *res; int ret; - clk = clk_get(&pdev->dev, NULL); + clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(clk)) { - printk(KERN_ERR "Orion Watchdog missing clock\n"); + dev_err(&pdev->dev, "Orion Watchdog missing clock\n"); return -ENODEV; } clk_prepare_enable(clk); wdt_tclk = clk_get_rate(clk); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - - wdt_reg = ioremap(res->start, resource_size(res)); - - if (orion_wdt_miscdev.parent) - return -EBUSY; - orion_wdt_miscdev.parent = &pdev->dev; + wdt_reg = devm_ioremap(&pdev->dev, res->start, resource_size(res)); + if (!wdt_reg) + return -ENOMEM; wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk; - if (orion_wdt_settimeout(heartbeat)) + + if ((heartbeat < 1) || (heartbeat > wdt_max_duration)) heartbeat = wdt_max_duration; - ret = misc_register(&orion_wdt_miscdev); - if (ret) + orion_wdt.timeout = heartbeat; + orion_wdt.min_timeout = 1; + orion_wdt.max_timeout = wdt_max_duration; + + watchdog_set_nowayout(&orion_wdt, nowayout); + ret = watchdog_register_device(&orion_wdt); + if (ret) { + clk_disable_unprepare(clk); return ret; + } pr_info("Initial timeout %d sec%s\n", heartbeat, nowayout ? ", nowayout" : ""); @@ -272,27 +182,14 @@ static int __devinit orion_wdt_probe(struct platform_device *pdev) static int __devexit orion_wdt_remove(struct platform_device *pdev) { - int ret; - - if (test_bit(WDT_IN_USE, &wdt_status)) { - orion_wdt_disable(); - clear_bit(WDT_IN_USE, &wdt_status); - } - - ret = misc_deregister(&orion_wdt_miscdev); - if (!ret) - orion_wdt_miscdev.parent = NULL; - + watchdog_unregister_device(&orion_wdt); clk_disable_unprepare(clk); - clk_put(clk); - - return ret; + return 0; } static void orion_wdt_shutdown(struct platform_device *pdev) { - if (test_bit(WDT_IN_USE, &wdt_status)) - orion_wdt_disable(); + orion_wdt_stop(&orion_wdt); } static struct platform_driver orion_wdt_driver = { |