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watchdog: renesas_wdt: Add restart handler
On iWave's boards iwg20d and iwg22d the only way to reboot the system is by means of the watchdog. This patch adds a restart handler to rwdt_ops, and also makes sure we keep its priority to the lowest level, in order to not override other more effective handlers. Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.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>
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@ -110,6 +110,16 @@ static unsigned int rwdt_get_timeleft(struct watchdog_device *wdev)
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return DIV_BY_CLKS_PER_SEC(priv, 65536 - val);
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}
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static int rwdt_restart(struct watchdog_device *wdev, unsigned long action,
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void *data)
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{
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struct rwdt_priv *priv = watchdog_get_drvdata(wdev);
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rwdt_start(wdev);
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rwdt_write(priv, 0xffff, RWTCNT);
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return 0;
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}
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static const struct watchdog_info rwdt_ident = {
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.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
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.identity = "Renesas WDT Watchdog",
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@ -121,6 +131,7 @@ static const struct watchdog_ops rwdt_ops = {
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.stop = rwdt_stop,
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.ping = rwdt_init_timeout,
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.get_timeleft = rwdt_get_timeleft,
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.restart = rwdt_restart,
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};
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#if defined(CONFIG_ARCH_RCAR_GEN2) && defined(CONFIG_SMP)
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@ -220,6 +231,7 @@ static int rwdt_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, priv);
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watchdog_set_drvdata(&priv->wdev, priv);
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watchdog_set_nowayout(&priv->wdev, nowayout);
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watchdog_set_restart_priority(&priv->wdev, 0);
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/* This overrides the default timeout only if DT configuration was found */
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ret = watchdog_init_timeout(&priv->wdev, 0, &pdev->dev);
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