Messages in this thread Patch in this message |  | | From | Ivan Khoronzhuk <> | Subject | [PATCH v4 3/5] watchdog: davinci: add GET_TIMELEFT option support | Date | Wed, 27 Nov 2013 14:48:26 +0200 |
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Currently, the davinci watchdog can be read while counting, so we can add ability to report the remaining time before the system will reboot.
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com> --- drivers/watchdog/davinci_wdt.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c index 2d46c43..0eb2189 100644 --- a/drivers/watchdog/davinci_wdt.c +++ b/drivers/watchdog/davinci_wdt.c @@ -116,6 +116,31 @@ static int davinci_wdt_ping(struct watchdog_device *wdd) return 0; } +static unsigned int davinci_wdt_get_timeleft(struct watchdog_device *wdd) +{ + u64 timer_counter; + unsigned long freq; + u32 val; + struct davinci_wdt_device *davinci_wdt = watchdog_get_drvdata(wdd); + + /* if timeout has occured then return 0 */ + val = ioread32(davinci_wdt->base + WDTCR); + if (val & WDFLAG) + return 0; + + freq = clk_get_rate(davinci_wdt->clk); + + if (!freq) + return 0; + + timer_counter = ioread32(davinci_wdt->base + TIM12); + timer_counter |= ((u64)ioread32(davinci_wdt->base + TIM34) << 32); + + do_div(timer_counter, freq); + + return wdd->timeout - timer_counter; +} + static const struct watchdog_info davinci_wdt_info = { .options = WDIOF_KEEPALIVEPING, .identity = "DaVinci Watchdog", @@ -126,6 +151,7 @@ static const struct watchdog_ops davinci_wdt_ops = { .start = davinci_wdt_start, .stop = davinci_wdt_ping, .ping = davinci_wdt_ping, + .get_timeleft = davinci_wdt_get_timeleft, }; static int davinci_wdt_probe(struct platform_device *pdev) -- 1.7.9.5
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