watchdog: mach-moxart: add restart handler

mach-moxart lacks a separate register for reset; as a workaround,
add a function that can be hooked to arm_pm_restart.

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/watchdog/moxart_wdt.c b/drivers/watchdog/moxart_wdt.c
index 4166e4d116a8..4aa3a8a876fe 100644
--- a/drivers/watchdog/moxart_wdt.c
+++ b/drivers/watchdog/moxart_wdt.c
@@ -19,6 +19,8 @@
 #include <linux/watchdog.h>
 #include <linux/moduleparam.h>
 
+#include <asm/system_misc.h>
+
 #define REG_COUNT                       0x4
 #define REG_MODE                        0x8
 #define REG_ENABLE                      0xC
@@ -29,8 +31,17 @@ struct moxart_wdt_dev {
         unsigned int clock_frequency;
 };
 
+static struct moxart_wdt_dev *moxart_restart_ctx;
+
 static int heartbeat;
 
+static void moxart_wdt_restart(enum reboot_mode reboot_mode, const char *cmd)
+{
+        writel(1, moxart_restart_ctx->base + REG_COUNT);
+        writel(0x5ab9, moxart_restart_ctx->base + REG_MODE);
+        writel(0x03, moxart_restart_ctx->base + REG_ENABLE);
+}
+
 static int moxart_wdt_stop(struct watchdog_device *wdt_dev)
 {
         struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev);
@@ -125,6 +136,9 @@ static int moxart_wdt_probe(struct platform_device *pdev)
         if (err)
                 return err;
 
+        moxart_restart_ctx = moxart_wdt;
+        arm_pm_restart = moxart_wdt_restart;
+
         dev_dbg(dev, "Watchdog enabled (heartbeat=%d sec, nowayout=%d)\n",
                 moxart_wdt->dev.timeout, nowayout);
 
@@ -135,6 +149,7 @@ static int moxart_wdt_remove(struct platform_device *pdev)
 {
         struct moxart_wdt_dev *moxart_wdt = platform_get_drvdata(pdev);
 
+        arm_pm_restart = NULL;
         moxart_wdt_stop(&moxart_wdt->dev);
         watchdog_unregister_device(&moxart_wdt->dev);