[PATCH 3/6] watchdog: davinci: add GET_TIMELEFT option support
From: Ivan Khoronzhuk <hidden>
Date: 2013-11-18 17:21:16
Also in:
linux-arm-kernel, linux-watchdog, lkml
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
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 <redacted> Acked-by: Santosh Shilimkar <redacted> --- 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 b353df5..55deaf8 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)
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1.7.9.5