[RFC 22/37] watchdog: renesas_wdt: Add restart support
From: Fabrizio Castro <hidden>
Date: 2018-01-25 18:02:56
Also in:
linux-clk, linux-devicetree, linux-renesas-soc, linux-watchdog
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
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 <redacted> Signed-off-by: Ramesh Shanmugasundaram <redacted> --- 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)
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2.7.4