From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: From: Andrew Bresticker To: Wim Van Sebroeck , Guenter Roeck Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Bresticker , Ezequiel Garcia Subject: [PATCH 4/4] watchdog: imgpdc: Add reboot support Date: Tue, 31 Mar 2015 11:49:11 -0700 Message-Id: <1427827751-19705-4-git-send-email-abrestic@chromium.org> In-Reply-To: <1427827751-19705-1-git-send-email-abrestic@chromium.org> References: <1427827751-19705-1-git-send-email-abrestic@chromium.org> List-ID: Register a restart handler that will restart the system by writing to the watchdog's SOFT_RESET register. Signed-off-by: Andrew Bresticker Cc: Ezequiel Garcia --- drivers/watchdog/imgpdc_wdt.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c index aef3596..d9eaee3 100644 --- a/drivers/watchdog/imgpdc_wdt.c +++ b/drivers/watchdog/imgpdc_wdt.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -57,6 +58,7 @@ struct pdc_wdt_dev { struct clk *wdt_clk; struct clk *sys_clk; void __iomem *base; + struct notifier_block restart_handler; }; static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev) @@ -130,6 +132,18 @@ static const struct watchdog_ops pdc_wdt_ops = { .set_timeout = pdc_wdt_set_timeout, }; +static int pdc_wdt_restart(struct notifier_block *this, unsigned long mode, + void *cmd) +{ + struct pdc_wdt_dev *wdt = container_of(this, struct pdc_wdt_dev, + restart_handler); + + /* Assert SOFT_RESET */ + writel(0x1, wdt->base + PDC_WDT_SOFT_RESET); + + return NOTIFY_OK; +} + static int pdc_wdt_probe(struct platform_device *pdev) { int ret, val; @@ -240,6 +254,13 @@ static int pdc_wdt_probe(struct platform_device *pdev) if (ret) goto disable_wdt_clk; + pdc_wdt->restart_handler.notifier_call = pdc_wdt_restart; + pdc_wdt->restart_handler.priority = 128; + ret = register_restart_handler(&pdc_wdt->restart_handler); + if (ret) + dev_warn(&pdev->dev, "failed to register restart handler: %d\n", + ret); + return 0; disable_wdt_clk: -- 2.2.0.rc0.207.ga3a616c