From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756542Ab3KFLmf (ORCPT ); Wed, 6 Nov 2013 06:42:35 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:46669 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756494Ab3KFLmd (ORCPT ); Wed, 6 Nov 2013 06:42:33 -0500 Message-ID: <527A28AF.9040308@ti.com> Date: Wed, 6 Nov 2013 13:31:59 +0200 From: "ivan.khoronzhuk" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: Santosh Shilimkar , , , , CC: , , , , , , , , Subject: Fwd: [PATCH 3/8] watchdog: davinci: add GET_TIMELEFT option support References: <1383680783-12114-4-git-send-email-ivan.khoronzhuk@ti.com> In-Reply-To: <1383680783-12114-4-git-send-email-ivan.khoronzhuk@ti.com> X-Forwarded-Message-Id: <1383680783-12114-4-git-send-email-ivan.khoronzhuk@ti.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.167.145.122] X-EXCLAIMER-MD-CONFIG: f9c360f5-3d1e-4c3c-8703-f45bf52eff6b Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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