[PATCH V2 3/3] watchdog: imgpdc: Add reboot support
Register a restart handler that will restart the system by writing
to the watchdog's SOFT_RESET register.
Signed-off-by: Andrew Bresticker
Reviewed-by: Guenter Roeck
Cc: Ezequiel Garcia
Cc: James Hogan
---
No changes from v1.
---
drivers/watchdog/imgpdc_wdt.c | 21 +
1 file changed, 21 insertions(+)
diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c
index c58b085..99e5ba4 100644
--- a/drivers/watchdog/imgpdc_wdt.c
+++ b/drivers/watchdog/imgpdc_wdt.c
@@ -16,6 +16,7 @@
#include
#include
#include
+#include
#include
#include
@@ -57,6 +58,7 @@ struct pdc_wdt_dev {
struct clk *wdt_clk;
struct clk *sys_clk;
void __iomem *base;
+ struct notifier_block restart_handler;
};
static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev)
@@ -136,6 +138,18 @@ static const struct watchdog_ops pdc_wdt_ops = {
.set_timeout= pdc_wdt_set_timeout,
};
+static int pdc_wdt_restart(struct notifier_block *this, unsigned long mode,
+ void *cmd)
+{
+ struct pdc_wdt_dev *wdt = container_of(this, struct pdc_wdt_dev,
+ restart_handler);
+
+ /* Assert SOFT_RESET */
+ writel(0x1, wdt->base + PDC_WDT_SOFT_RESET);
+
+ return NOTIFY_OK;
+}
+
static int pdc_wdt_probe(struct platform_device *pdev)
{
int ret, val;
@@ -246,6 +260,13 @@ static int pdc_wdt_probe(struct platform_device *pdev)
if (ret)
goto disable_wdt_clk;
+ pdc_wdt->restart_handler.notifier_call = pdc_wdt_restart;
+ pdc_wdt->restart_handler.priority = 128;
+ ret = register_restart_handler(_wdt->restart_handler);
+ if (ret)
+ dev_warn(>dev, "failed to register restart handler: %d\n",
+ret);
+
return 0;
disable_wdt_clk:
--
2.2.0.rc0.207.ga3a616c
--
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[PATCH V2 3/3] watchdog: imgpdc: Add reboot support
Register a restart handler that will restart the system by writing
to the watchdog's SOFT_RESET register.
Signed-off-by: Andrew Bresticker abres...@chromium.org
Reviewed-by: Guenter Roeck li...@roeck-us.net
Cc: Ezequiel Garcia ezequiel.gar...@imgtec.com
Cc: James Hogan james.ho...@imgtec.com
---
No changes from v1.
---
drivers/watchdog/imgpdc_wdt.c | 21 +
1 file changed, 21 insertions(+)
diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c
index c58b085..99e5ba4 100644
--- a/drivers/watchdog/imgpdc_wdt.c
+++ b/drivers/watchdog/imgpdc_wdt.c
@@ -16,6 +16,7 @@
#include linux/log2.h
#include linux/module.h
#include linux/platform_device.h
+#include linux/reboot.h
#include linux/slab.h
#include linux/watchdog.h
@@ -57,6 +58,7 @@ struct pdc_wdt_dev {
struct clk *wdt_clk;
struct clk *sys_clk;
void __iomem *base;
+ struct notifier_block restart_handler;
};
static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev)
@@ -136,6 +138,18 @@ static const struct watchdog_ops pdc_wdt_ops = {
.set_timeout= pdc_wdt_set_timeout,
};
+static int pdc_wdt_restart(struct notifier_block *this, unsigned long mode,
+ void *cmd)
+{
+ struct pdc_wdt_dev *wdt = container_of(this, struct pdc_wdt_dev,
+ restart_handler);
+
+ /* Assert SOFT_RESET */
+ writel(0x1, wdt-base + PDC_WDT_SOFT_RESET);
+
+ return NOTIFY_OK;
+}
+
static int pdc_wdt_probe(struct platform_device *pdev)
{
int ret, val;
@@ -246,6 +260,13 @@ static int pdc_wdt_probe(struct platform_device *pdev)
if (ret)
goto disable_wdt_clk;
+ pdc_wdt-restart_handler.notifier_call = pdc_wdt_restart;
+ pdc_wdt-restart_handler.priority = 128;
+ ret = register_restart_handler(pdc_wdt-restart_handler);
+ if (ret)
+ dev_warn(pdev-dev, failed to register restart handler: %d\n,
+ret);
+
return 0;
disable_wdt_clk:
--
2.2.0.rc0.207.ga3a616c
--
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