From: ivan.khoronzhuk@ti•com (ivan.khoronzhuk)
To: linux-arm-kernel@lists•infradead.org
Subject: Fwd: [PATCH 3/8] watchdog: davinci: add GET_TIMELEFT option support
Date: Wed, 6 Nov 2013 13:31:59 +0200 [thread overview]
Message-ID: <527A28AF.9040308@ti.com> (raw)
In-Reply-To: <1383680783-12114-4-git-send-email-ivan.khoronzhuk@ti.com>
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>
---
drivers/watchdog/davinci_wdt.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/watchdog/davinci_wdt.c b/drivers/watchdog/davinci_wdt.c
index 1fc2093..6cbf2e1 100644
--- a/drivers/watchdog/davinci_wdt.c
+++ b/drivers/watchdog/davinci_wdt.c
@@ -117,6 +117,33 @@ 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 is occured then return 0 */
+ val = ioread32(davinci_wdt->base + WDTCR);
+ if (val & WDFLAG)
+ return 0;
+
+ freq = clk_get_rate(davinci_wdt->clk);
+
+ if (!freq) {
+ dev_err(wdd->dev, "clock freq is not set\n");
+ 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",
@@ -127,6 +154,7 @@ 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
next parent reply other threads:[~2013-11-06 11:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1383680783-12114-4-git-send-email-ivan.khoronzhuk@ti.com>
2013-11-06 11:31 ` ivan.khoronzhuk [this message]
2013-11-12 15:37 ` Fwd: [PATCH 3/8] watchdog: davinci: add GET_TIMELEFT option support Santosh Shilimkar
2013-11-17 2:22 ` Guenter Roeck
2013-11-18 13:21 ` ivan.khoronzhuk
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