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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>
This commit is contained in:
Jonas Jensen 2013-12-18 16:18:03 +01:00 committed by Wim Van Sebroeck
parent d5cfaf0a85
commit 8773926d71
1 changed files with 15 additions and 0 deletions
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15
drivers/watchdog/moxart_wdt.c
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@ -19,6 +19,8 @@
#include <linux/watchdog.h> #include <linux/watchdog.h>
#include <linux/moduleparam.h> #include <linux/moduleparam.h>
#include <asm/system_misc.h>
#define REG_COUNT 0x4 #define REG_COUNT 0x4
#define REG_MODE 0x8 #define REG_MODE 0x8
#define REG_ENABLE 0xC #define REG_ENABLE 0xC
@ -29,8 +31,17 @@ struct moxart_wdt_dev {
unsigned int clock_frequency; unsigned int clock_frequency;
}; };
static struct moxart_wdt_dev *moxart_restart_ctx;
static int heartbeat; 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) static int moxart_wdt_stop(struct watchdog_device *wdt_dev)
{ {
struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(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) if (err)
return 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", dev_dbg(dev, "Watchdog enabled (heartbeat=%d sec, nowayout=%d)\n",
moxart_wdt->dev.timeout, nowayout); 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); struct moxart_wdt_dev *moxart_wdt = platform_get_drvdata(pdev);
arm_pm_restart = NULL;
moxart_wdt_stop(&moxart_wdt->dev); moxart_wdt_stop(&moxart_wdt->dev);
watchdog_unregister_device(&moxart_wdt->dev); watchdog_unregister_device(&moxart_wdt->dev);