This commit extends the driver to add restart support by implementing
the restart callback to trigger the watchdog as quickly as possible.
Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@xxxxxxxxxxxxxx>
---
drivers/watchdog/renesas_wdt.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 831ef83..120ddac 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -107,6 +107,24 @@ static unsigned int rwdt_get_timeleft(struct watchdog_device *wdev)
return DIV_BY_CLKS_PER_SEC(priv, 65536 - val);
}
+static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
+ void *data)
+{
+ struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ pm_runtime_get_sync(wdev->parent);
+
+ rwdt_write(priv, 0x00, RWTCSRB);
+ rwdt_write(priv, 0x00, RWTCSRA);
+ rwdt_write(priv, 0xffff, RWTCNT);
+
+ while (readb_relaxed(priv->base + RWTCSRA) & RWTCSRA_WRFLG)
+ cpu_relax();
+
+ rwdt_write(priv, 0x80, RWTCSRA);
+ return 0;
+}
+
static const struct watchdog_info rwdt_ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
.identity = "Renesas WDT Watchdog",
@@ -118,6 +136,7 @@ static const struct watchdog_ops rwdt_ops = {
.stop = rwdt_stop,
.ping = rwdt_init_timeout,
.get_timeleft = rwdt_get_timeleft,
+ .restart = rwdt_restart,
};
static int rwdt_probe(struct platform_device *pdev)
--
2.7.4
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