From c631f20068369a8b901574df9c7bfc57ce13de75 Mon Sep 17 00:00:00 2001 From: Andrew Bresticker Date: Fri, 3 Apr 2015 10:05:22 -0700 Subject: [PATCH] watchdog: imgpdc: Add reboot support Register a restart handler that will restart the system by writing to the watchdog's SOFT_RESET register. Signed-off-by: Andrew Bresticker Reviewed-by: Ezequiel Garcia Tested-by: Ezequiel Garcia Cc: James Hogan Reviewed-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- 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 ffeb1bf85252..28c10e292aa3 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) @@ -136,6 +138,18 @@ 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; @@ -242,6 +256,13 @@ 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: -- 2.20.1