From patchwork Wed Mar 11 15:29:38 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Atal Shargorodsky X-Patchwork-Id: 11157 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n2BFV451004265 for ; Wed, 11 Mar 2009 15:31:04 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753411AbZCKPbD (ORCPT ); Wed, 11 Mar 2009 11:31:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753517AbZCKPbD (ORCPT ); Wed, 11 Mar 2009 11:31:03 -0400 Received: from smtp.nokia.com ([192.100.122.230]:45606 "EHLO mgw-mx03.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753553AbZCKPa6 (ORCPT ); Wed, 11 Mar 2009 11:30:58 -0400 Received: from vaebh105.NOE.Nokia.com (vaebh105.europe.nokia.com [10.160.244.31]) by mgw-mx03.nokia.com (Switch-3.2.6/Switch-3.2.6) with ESMTP id n2BFUoJD025713; Wed, 11 Mar 2009 17:30:51 +0200 Received: from vaebh104.NOE.Nokia.com ([10.160.244.30]) by vaebh105.NOE.Nokia.com with Microsoft SMTPSVC(6.0.3790.3959); Wed, 11 Mar 2009 17:30:21 +0200 Received: from mgw-int01.ntc.nokia.com ([172.21.143.96]) by vaebh104.NOE.Nokia.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Wed, 11 Mar 2009 17:30:21 +0200 Received: from localhost.localdomain (esdhcp042174.research.nokia.com [172.21.42.174]) by mgw-int01.ntc.nokia.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id n2BFUB34017872; Wed, 11 Mar 2009 17:30:20 +0200 From: Atal Shargorodsky To: linux-omap@vger.kernel.org Cc: linux-arm-kernel@lists.arm.linux.org.uk, Atal Shargorodsky Subject: [PATCH 6/6] OMAP: omap_wdt: Changing NOWAYOUT behavior does not require kernel reconfiguration. Date: Wed, 11 Mar 2009 17:29:38 +0200 Message-Id: <8978e7baa400a1c447914b83e17ced5313dce734.1236609434.git.ext-atal.shargorodsky@nokia.com> X-Mailer: git-send-email 1.5.4.3 In-Reply-To: <6bfd4bd0c37668c409e3c2154ba2ab22c8a42800.1236609434.git.ext-atal.shargorodsky@nokia.com> References: <> <1236785378-14640-1-git-send-email-ext-atal.shargorodsky@nokia.com> <0fe7f2934f8416e9b5f05e2f18766362560116ee.1236609434.git.ext-atal.shargorodsky@nokia.com> <7992fd993e5b420f9c2aac55f6e674169b36c666.1236609434.git.ext-atal.shargorodsky@nokia.com> <0db69821a1be58e0b8889609ff2b2ee272aa3286.1236609434.git.ext-atal.shargorodsky@nokia.com> <6bfd4bd0c37668c409e3c2154ba2ab22c8a42800.1236609434.git.ext-atal.shargorodsky@nokia.com> In-Reply-To: References: X-OriginalArrivalTime: 11 Mar 2009 15:30:21.0500 (UTC) FILETIME=[4A5CEFC0:01C9A25E] X-Nokia-AV: Clean Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org By introducing additional module parameter we make the CONFIG_WATCHDOG_NOWAYOUT to be a mere default module behavior, which can be overriden by providing nowayout=[01] parameter at load time. Signed-off-by: Atal Shargorodsky --- drivers/watchdog/omap_wdt.c | 48 +++++++++++++++++++++++------------------- 1 files changed, 26 insertions(+), 22 deletions(-) diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c index 6f6a524..6e9617c 100644 --- a/drivers/watchdog/omap_wdt.c +++ b/drivers/watchdog/omap_wdt.c @@ -53,6 +53,13 @@ static unsigned timer_margin; module_param(timer_margin, uint, 0); MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)"); +static int nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, int, 0); +MODULE_PARM_DESC(nowayout, + "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + + static unsigned int wdt_trgr_pattern = 0x1234; static spinlock_t wdt_lock; @@ -188,22 +195,20 @@ static int omap_wdt_release(struct inode *inode, struct file *file) { struct omap_wdt_dev *wdev = file->private_data; - /* - * Shut off the timer unless NOWAYOUT is defined. - */ -#ifndef CONFIG_WATCHDOG_NOWAYOUT - omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1); - omap_wdt_disable(wdev); - omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0); + if (nowayout) { + /* Give the user application some time to recover + * in case of crash. + * */ + omap_wdt_ping(wdev); + printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n"); + } else { + omap_wdt_disable(wdev); - clk_disable(wdev->mpu_wdt_fck); - wdev->omap_wdt_state &= ~(1 << OMAP_WDT_STATE_ACTIVATED_BIT); -#else - /* Give the user application some time to recover in case of crash. */ - omap_wdt_ping(wdev); - printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n"); -#endif + clk_disable(wdev->mpu_wdt_fck); + wdev->omap_wdt_state &= ~(1 << OMAP_WDT_STATE_ACTIVATED_BIT); + } + omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0); wdev->omap_wdt_state &= ~(1 << OMAP_WDT_STATE_OPENED_BIT); return 0; @@ -385,9 +390,10 @@ static int __init omap_wdt_probe(struct platform_device *pdev) if (ret) goto err_misc; - pr_info("OMAP Watchdog Timer Rev 0x%02x: initial timeout %d sec\n", + pr_info("OMAP Watchdog Timer Rev 0x%02x: initial " + "timeout %d sec, nowayout is %s\n", __raw_readl(wdev->base + OMAP_WATCHDOG_REV) & 0xFF, - timer_margin); + timer_margin, (nowayout ? "on" : "off")); /* autogate OCP interface clock */ __raw_writel(0x01, wdev->base + OMAP_WATCHDOG_SYS_CONFIG); @@ -467,12 +473,6 @@ static int omap_wdt_remove(struct platform_device *pdev) #ifdef CONFIG_PM -/* REVISIT ... not clear this is the best way to handle system suspend; and - * it's very inappropriate for selective device suspend (e.g. suspending this - * through sysfs rather than by stopping the watchdog daemon). Also, this - * may not play well enough with NOWAYOUT... - */ - static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state) { struct omap_wdt_dev *wdev = platform_get_drvdata(pdev); @@ -481,6 +481,8 @@ static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state) omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1); omap_wdt_disable(wdev); omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0); + clk_disable(wdev->mpu_wdt_fck); +printk (KERN_EMERG "omap_wdt: suspend \n"); } return 0; @@ -491,10 +493,12 @@ static int omap_wdt_resume(struct platform_device *pdev) struct omap_wdt_dev *wdev = platform_get_drvdata(pdev); if (wdev->omap_wdt_state & (1<mpu_wdt_fck); omap_wdt_ick_enable(wdev->mpu_wdt_ick, 1); omap_wdt_enable(wdev); omap_wdt_ping(wdev); omap_wdt_ick_enable(wdev->mpu_wdt_ick, 0); +printk (KERN_EMERG "omap_wdt: resume\n"); } return 0;