The kernel core now provides an API to trigger a system restart.
Register with it instead of setting arm_pm_restart.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Acked-by: Heiko Stuebner <heiko@xxxxxxxxx>
---
v7: Added patch to series. Necessary since the restart handler in the driver
is now available upstream.
drivers/watchdog/sunxi_wdt.c | 31 ++++++++++++++++++++-----------
1 file changed, 20 insertions(+), 11 deletions(-)
diff --git a/drivers/watchdog/sunxi_wdt.c b/drivers/watchdog/sunxi_wdt.c
index 60deb9d..480bb55 100644
--- a/drivers/watchdog/sunxi_wdt.c
+++ b/drivers/watchdog/sunxi_wdt.c
@@ -21,14 +21,13 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/types.h>
#include <linux/watchdog.h>
-#include <asm/system_misc.h>
-
#define WDT_MAX_TIMEOUT 16
#define WDT_MIN_TIMEOUT 1
#define WDT_MODE_TIMEOUT(n) ((n) << 3)
@@ -50,6 +49,7 @@ static unsigned int timeout = WDT_MAX_TIMEOUT;
struct sunxi_wdt_dev {
struct watchdog_device wdt_dev;
void __iomem *wdt_base;
+ struct notifier_block restart_handler;
};
/*
@@ -74,24 +74,29 @@ static const int wdt_timeout_map[] = {
[16] = 0xB, /* 16s */
};
-static void __iomem *reboot_wdt_base;
-static void sun4i_wdt_restart(enum reboot_mode mode, const char *cmd)
+static int sunxi_restart_handle(struct notifier_block *this, unsigned long mode,
+ void *cmd)
{
+ struct sunxi_wdt_dev *sunxi_wdt = container_of(this,
+ struct sunxi_wdt_dev,
+ restart_handler);
+ void __iomem *wdt_base = sunxi_wdt->wdt_base;
+
/* Enable timer and set reset bit in the watchdog */
- writel(WDT_MODE_EN | WDT_MODE_RST_EN, reboot_wdt_base + WDT_MODE);
+ writel(WDT_MODE_EN | WDT_MODE_RST_EN, wdt_base + WDT_MODE);
/*
* Restart the watchdog. The default (and lowest) interval
* value for the watchdog is 0.5s.
*/
- writel(WDT_CTRL_RELOAD, reboot_wdt_base + WDT_CTRL);
+ writel(WDT_CTRL_RELOAD, wdt_base + WDT_CTRL);
while (1) {
mdelay(5);
- writel(WDT_MODE_EN | WDT_MODE_RST_EN,
- reboot_wdt_base + WDT_MODE);
+ writel(WDT_MODE_EN | WDT_MODE_RST_EN, wdt_base + WDT_MODE);
}
+ return NOTIFY_DONE;
}
static int sunxi_wdt_ping(struct watchdog_device *wdt_dev)
@@ -205,8 +210,12 @@ static int sunxi_wdt_probe(struct platform_device *pdev)
if (unlikely(err))
return err;
- reboot_wdt_base = sunxi_wdt->wdt_base;
- arm_pm_restart = sun4i_wdt_restart;
+ sunxi_wdt->restart_handler.notifier_call = sunxi_restart_handle;
+ sunxi_wdt->restart_handler.priority = 128;
+ err = register_restart_handler(&sunxi_wdt->restart_handler);
+ if (err)
+ dev_err(&pdev->dev,
+ "cannot register restart handler (err=%d)\n", err);
dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)",
sunxi_wdt->wdt_dev.timeout, nowayout);
@@ -218,7 +227,7 @@ static int sunxi_wdt_remove(struct platform_device *pdev)
{
struct sunxi_wdt_dev *sunxi_wdt = platform_get_drvdata(pdev);
- arm_pm_restart = NULL;
+ unregister_restart_handler(&sunxi_wdt->restart_handler);
watchdog_unregister_device(&sunxi_wdt->wdt_dev);
watchdog_set_drvdata(&sunxi_wdt->wdt_dev, NULL);
--
1.9.1
--
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