diff options
| author | Andrew Bresticker <abrestic@chromium.org> | 2015-04-03 19:05:22 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2015-06-22 15:54:14 +0200 |
| commit | c631f20068369a8b901574df9c7bfc57ce13de75 (patch) | |
| tree | dfd20ca844fdb97eb3a00b61d011e0898aa21187 /drivers/watchdog | |
| parent | watchdog: imgpdc: Set timeout before starting watchdog (diff) | |
| download | linux-c631f20068369a8b901574df9c7bfc57ce13de75.tar.xz linux-c631f20068369a8b901574df9c7bfc57ce13de75.zip | |
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 <abrestic@chromium.org>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/imgpdc_wdt.c | 21 |
1 files changed, 21 insertions, 0 deletions
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 <linux/log2.h> #include <linux/module.h> #include <linux/platform_device.h> +#include <linux/reboot.h> #include <linux/slab.h> #include <linux/watchdog.h> @@ -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: |