On 04/29/2018 11:44 PM, Jongsung Kim wrote:
Add restart handler for SP805 watchdog so that the driver can be
used to reboot the system.
Signed-off-by: Jongsung Kim <neidhard.kim@xxxxxxx>
---
drivers/watchdog/sp805_wdt.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 01d816251302..01f7b6c29f92 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c
@@ -23,6 +23,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pm.h>
+#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
@@ -67,6 +68,7 @@ struct sp805_wdt {
struct clk *clk;
struct amba_device *adev;
unsigned int load_val;
+ struct notifier_block restart;
};
static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -200,6 +202,18 @@ static const struct watchdog_ops wdt_ops = {
.get_timeleft = wdt_timeleft,
};
+static int
+wdt_restart(struct notifier_block *this, unsigned long mode, void *cmd)
+{
+ struct sp805_wdt *wdt = container_of(this, struct sp805_wdt, restart);
+
+ writel_relaxed(0, wdt->base + WDTCONTROL);
+ writel_relaxed(0, wdt->base + WDTLOAD);
+ writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL);
+
+ return 0;
+}
+
static int
sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
{
@@ -241,6 +255,10 @@ sp805_wdt_probe(struct amba_device *adev, const struct amba_id *id)
}
amba_set_drvdata(adev, wdt);
+ wdt->restart.notifier_call = wdt_restart;
+ wdt->restart.priority = 128;
+ register_restart_handler(&wdt->restart);
+
Why not use the watchdog core ?
Guenter
dev_info(&adev->dev, "registration successful\n");
return 0;
@@ -253,6 +271,7 @@ static int sp805_wdt_remove(struct amba_device *adev)
{
struct sp805_wdt *wdt = amba_get_drvdata(adev);
+ unregister_restart_handler(&wdt->restart);
watchdog_unregister_device(&wdt->wdd);
watchdog_set_drvdata(&wdt->wdd, NULL);
--
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