From c99d9df1d3c312759c43a3da0d2f17b4aecc05c8 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Thu, 13 Sep 2018 23:32:11 +0200 Subject: watchdog: lantiq: add get_timeleft callback This callback will provide the current time left. Signed-off-by: Hauke Mehrtens Reviewed-by: Guenter Roeck Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/lantiq_wdt.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'drivers/watchdog') diff --git a/drivers/watchdog/lantiq_wdt.c b/drivers/watchdog/lantiq_wdt.c index c2f14d2bd695..83da84d6074b 100644 --- a/drivers/watchdog/lantiq_wdt.c +++ b/drivers/watchdog/lantiq_wdt.c @@ -50,6 +50,7 @@ #define LTQ_WDT_CR_MAX_TIMEOUT ((1 << 16) - 1) /* The reload field is 16 bit */ #define LTQ_WDT_SR 0x8 /* watchdog status register */ #define LTQ_WDT_SR_EN BIT(31) /* Enable */ +#define LTQ_WDT_SR_VALUE_MASK GENMASK(15, 0) /* Timer value */ #define LTQ_WDT_DIVIDER 0x40000 @@ -139,11 +140,21 @@ static int ltq_wdt_ping(struct watchdog_device *wdt) return 0; } +static unsigned int ltq_wdt_get_timeleft(struct watchdog_device *wdt) +{ + struct ltq_wdt_priv *priv = ltq_wdt_get_priv(wdt); + u64 timeout; + + timeout = ltq_wdt_r32(priv, LTQ_WDT_SR) & LTQ_WDT_SR_VALUE_MASK; + return do_div(timeout, priv->clk_rate); +} + static const struct watchdog_ops ltq_wdt_ops = { .owner = THIS_MODULE, .start = ltq_wdt_start, .stop = ltq_wdt_stop, .ping = ltq_wdt_ping, + .get_timeleft = ltq_wdt_get_timeleft, }; static int ltq_wdt_xrx_bootstatus_get(struct device *dev) -- cgit