On 09/18/2014 11:29 PM, Jisheng Zhang wrote:
The kernel core now provides an API to trigger a system restart. Register with it to support restarting the system via. watchdog.Signed-off-by: Jisheng Zhang <jszh...@marvell.com> --- drivers/watchdog/dw_wdt.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c index ad0619d..4ca41e9 100644 --- a/drivers/watchdog/dw_wdt.c +++ b/drivers/watchdog/dw_wdt.c @@ -29,9 +29,11 @@ #include <linux/miscdevice.h> #include <linux/module.h> #include <linux/moduleparam.h> +#include <linux/notifier.h> #include <linux/of.h> #include <linux/pm.h> #include <linux/platform_device.h> +#include <linux/reboot.h> #include <linux/spinlock.h> #include <linux/timer.h> #include <linux/uaccess.h> @@ -62,6 +64,7 @@ static struct { unsigned long next_heartbeat; struct timer_list timer; int expect_close; + struct notifier_block restart_handler; } dw_wdt; static inline int dw_wdt_is_enabled(void) @@ -119,6 +122,22 @@ static void dw_wdt_keepalive(void) WDOG_COUNTER_RESTART_REG_OFFSET); } +static int dw_wdt_restart_handle(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + u32 val; + + writel(0, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); + val = readl(dw_wdt.regs + WDOG_CONTROL_REG_OFFSET); + if (val & WDOG_CONTROL_REG_WDT_EN_MASK) + writel(WDOG_COUNTER_RESTART_KICK_VALUE, dw_wdt.regs + + WDOG_COUNTER_RESTART_REG_OFFSET); + else + writel(WDOG_CONTROL_REG_WDT_EN_MASK, + dw_wdt.regs + WDOG_CONTROL_REG_OFFSET);
Another comment: You should probably wait here for a bit to let the reset catch. Thanks, Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
