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watchdog: renesas-wdt: Add support for WDIOF_CARDRESET 

This patch adds the WDIOF_CARDRESET support for the Renesas platform
watchdog, to know if the board reboot is due to a watchdog reset.

This is done via the WOVF bit (bit 4) of the RWTCSRA register, which
indicates if RWTCNT overflowed, triggering the reset in last boot.

Signed-off-by: Veeraiyan Chidambaram <veeraiyan.chidambaram@in.bosch.com>
[takeshi.kihara.df: changed to read the RWTCSRA register while clock is
 enabled]
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
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>
hifive-unleashed-5.1
Veeraiyan Chidambaram 2018-04-13 16:19:24 +02:00 committed by Wim Van Sebroeck
parent e30d69df78
commit fdac6a90d2
1 changed files with 4 additions and 2 deletions
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6
drivers/watchdog/renesas_wdt.c
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@ -121,7 +121,8 @@ static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
}
static const struct watchdog_info rwdt_ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
WDIOF_CARDRESET,
.identity = "Renesas WDT Watchdog",
};
@ -197,9 +198,10 @@ static int rwdt_probe(struct platform_device *pdev)
return PTR_ERR(clk);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
priv->clk_rate = clk_get_rate(clk);
priv->wdev.bootstatus = (readb_relaxed(priv->base + RWTCSRA) &
RWTCSRA_WOVF) ? WDIOF_CARDRESET : 0;
pm_runtime_put(&pdev->dev);
if (!priv->clk_rate) {