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Commit a7719949 authored by Ivan Khoronzhuk's avatar Ivan Khoronzhuk Committed by Wim Van Sebroeck
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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: default avatarIvan Khoronzhuk <ivan.khoronzhuk@ti.com>
Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 6d9a6cf5

drivers/watchdog/davinci_wdt.c

+26 −0
Original line number Diff line number Diff line
@@ -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)