watchdog: ixp4xx: Implement restart

Implement watchdog restart in the IXP4xx watchdog timer.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220206230028.476659-1-linus.walleij@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/ixp4xx_wdt.c b/drivers/watchdog/ixp4xx_wdt.c
index 31b03fa..281a48d 100644 (file)
--- a/drivers/watchdog/ixp4xx_wdt.c
+++ b/drivers/watchdog/ixp4xx_wdt.c
@@ -84,10 +84,24 @@ static int ixp4xx_wdt_set_timeout(struct watchdog_device *wdd,
        return 0;
 }
 
+static int ixp4xx_wdt_restart(struct watchdog_device *wdd,
+                              unsigned long action, void *data)
+{
+       struct ixp4xx_wdt *iwdt = to_ixp4xx_wdt(wdd);
+
+       __raw_writel(IXP4XX_WDT_KEY, iwdt->base + IXP4XX_OSWK_OFFSET);
+       __raw_writel(0, iwdt->base + IXP4XX_OSWT_OFFSET);
+       __raw_writel(IXP4XX_WDT_COUNT_ENABLE | IXP4XX_WDT_RESET_ENABLE,
+                    iwdt->base + IXP4XX_OSWE_OFFSET);
+
+       return 0;
+}
+
 static const struct watchdog_ops ixp4xx_wdt_ops = {
        .start = ixp4xx_wdt_start,
        .stop = ixp4xx_wdt_stop,
        .set_timeout = ixp4xx_wdt_set_timeout,
+       .restart = ixp4xx_wdt_restart,
        .owner = THIS_MODULE,
 };