watchdog: dw_wdt: add restart handler support

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 <jszhang@marvell.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 449c88523364..9e577a64ec9e 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -21,6 +21,7 @@
 
 #include <linux/bitops.h>
 #include <linux/clk.h>
+#include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/fs.h>
@@ -29,9 +30,11 @@
 #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>
@@ -63,6 +66,7 @@ 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)
@@ -121,6 +125,26 @@ 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);
+
+        /* wait for reset to assert... */
+        mdelay(500);
+
+        return NOTIFY_DONE;
+}
+
 static void dw_wdt_ping(unsigned long data)
 {
         if (time_before(jiffies, dw_wdt.next_heartbeat) ||
@@ -316,6 +340,12 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
         if (ret)
                 goto out_disable_clk;
 
+        dw_wdt.restart_handler.notifier_call = dw_wdt_restart_handle;
+        dw_wdt.restart_handler.priority = 128;
+        ret = register_restart_handler(&dw_wdt.restart_handler);
+        if (ret)
+                pr_warn("cannot register restart handler\n");
+
         dw_wdt_set_next_heartbeat();
         setup_timer(&dw_wdt.timer, dw_wdt_ping, 0);
         mod_timer(&dw_wdt.timer, jiffies + WDT_TIMEOUT);
@@ -330,6 +360,8 @@ out_disable_clk:
 
 static int dw_wdt_drv_remove(struct platform_device *pdev)
 {
+        unregister_restart_handler(&dw_wdt.restart_handler);
+
         misc_deregister(&dw_wdt_miscdev);
 
         clk_disable_unprepare(dw_wdt.clk);