From: Sylvain Lemieux <slemieux@xxxxxxxxxxx>
Add restart handler capability to the driver;
the restart handler implementation was taken from
"mach-lpc32xx" ("lpc23xx_restart" function).
Signed-off-by: Sylvain Lemieux <slemieux@xxxxxxxxxxx>
---
Changes from v2 to v3:
- remove explicit clock enable from restart handler.
- verify "register_restart_handler" return value.
- add call to unregister_restart_handler".
- do the restart handling directly in "pnx4008_restart_handler".
Changes from v1 to v2:
- new patch in v2.
drivers/watchdog/pnx4008_wdt.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c
index 88264a2..80ee4af 100644
--- a/drivers/watchdog/pnx4008_wdt.c
+++ b/drivers/watchdog/pnx4008_wdt.c
@@ -31,6 +31,8 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
#include <mach/hardware.h>
/* WatchDog Timer - Chapter 23 Page 207 */
@@ -77,6 +79,7 @@
static bool nowayout = WATCHDOG_NOWAYOUT;
static unsigned int heartbeat = DEFAULT_HEARTBEAT;
+static struct notifier_block restart_handler;
static DEFINE_SPINLOCK(io_lock);
static void __iomem *wdt_base;
@@ -124,6 +127,19 @@ static int pnx4008_wdt_set_timeout(struct watchdog_device *wdd,
return 0;
}
+static int pnx4008_restart_handler(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ /* Instant assert of RESETOUT_N with pulse length 1mS */
+ writel(13000, WDTIM_PULSE(wdt_base));
+ writel(M_RES2 | RESFRC1 | RESFRC2, WDTIM_MCTRL(wdt_base));
+
+ /* Wait for watchdog to reset system */
+ mdelay(1000);
+
+ return NOTIFY_DONE;
+}
+
static const struct watchdog_info pnx4008_wdt_ident = {
.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
@@ -157,6 +173,15 @@ static int pnx4008_wdt_probe(struct platform_device *pdev)
if (IS_ERR(wdt_base))
return PTR_ERR(wdt_base);
+ /* Register restart handler. */
+ restart_handler.notifier_call = pnx4008_restart_handler;
+ restart_handler.priority = 128;
+ ret = register_restart_handler(&restart_handler);
+ if (ret) {
+ dev_warn(&pdev->dev, "cannot register restart handler\n");
+ return ret;
+ }
+
wdt_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(wdt_clk))
return PTR_ERR(wdt_clk);
@@ -189,6 +214,7 @@ disable_clk:
static int pnx4008_wdt_remove(struct platform_device *pdev)
{
+ unregister_restart_handler(&restart_handler);
watchdog_unregister_device(&pnx4008_wdd);
clk_disable_unprepare(wdt_clk);
--
1.8.3.1
--
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