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authorFabrizio Castro <fabrizio.castro@bp.renesas.com>2018-03-05 15:30:24 +0000
committerWim Van Sebroeck <wim@linux-watchdog.org>2018-03-10 11:45:34 +0100
commit07278ca1ccc9a1241f14a8aaa4f2430b7b217c3f (patch)
tree597b834ef88a1572e1747f1642a0a035dced6a0b /drivers/watchdog
parent755ae842782037b35742e759aa0601b3c5834111 (diff)
downloadlinux-07278ca1ccc9a1241f14a8aaa4f2430b7b217c3f.tar.bz2
watchdog: renesas_wdt: Add suspend/resume support
On R-Car Gen2 and RZ/G1 the watchdog IP clock needs to be always ON, on R-Car Gen3 we power the IP down during suspend. This commit adds suspend/resume support, so that the watchdog counting "pauses" during suspend on all of the SoCs compatible with this driver and on those we are now adding support for (R-Car Gen2 and RZ/G1). Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/renesas_wdt.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 831ef83f6de1..024d54eda11e 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -49,6 +49,7 @@ struct rwdt_priv {
void __iomem *base;
struct watchdog_device wdev;
unsigned long clk_rate;
+ u16 time_left;
u8 cks;
};
@@ -203,6 +204,30 @@ static int rwdt_remove(struct platform_device *pdev)
return 0;
}
+static int __maybe_unused rwdt_suspend(struct device *dev)
+{
+ struct rwdt_priv *priv = dev_get_drvdata(dev);
+
+ if (watchdog_active(&priv->wdev)) {
+ priv->time_left = readw(priv->base + RWTCNT);
+ rwdt_stop(&priv->wdev);
+ }
+ return 0;
+}
+
+static int __maybe_unused rwdt_resume(struct device *dev)
+{
+ struct rwdt_priv *priv = dev_get_drvdata(dev);
+
+ if (watchdog_active(&priv->wdev)) {
+ rwdt_start(&priv->wdev);
+ rwdt_write(priv, priv->time_left, RWTCNT);
+ }
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rwdt_pm_ops, rwdt_suspend, rwdt_resume);
+
/*
* This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP
* to work there, one also needs a RESET (RST) driver which does not exist yet
@@ -218,6 +243,7 @@ static struct platform_driver rwdt_driver = {
.driver = {
.name = "renesas_wdt",
.of_match_table = rwdt_ids,
+ .pm = &rwdt_pm_ops,
},
.probe = rwdt_probe,
.remove = rwdt_remove,