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| author | Ivan Khoronzhuk <ivan.khoronzhuk@ti.com> | 2013-12-04 21:39:28 +0200 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2014-01-28 21:19:58 +0100 |
| commit | a771994901bde73779c94ec558b95c75bc2c7518 (patch) | |
| tree | c48c68bf5d83148ec647e83d38844e1b0910356d /drivers/watchdog | |
| parent | 6d9a6cf5c63fe4f08b05fc53f7a17048df86d3ac (diff) | |
| download | linux-a771994901bde73779c94ec558b95c75bc2c7518.tar.gz | |
watchdog: davinci: add GET_TIMELEFT option support
Currently, the davinci watchdog can be read while counting, so we can add ability to report the remaining time before the system will reboot. Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.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/davinci_wdt.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c index 6d76fcf00525..dbe28343e749 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) |