From patchwork Fri Sep 17 22:53:28 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Timur Tabi X-Patchwork-Id: 65113 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from bilbo.ozlabs.org (localhost [127.0.0.1]) by ozlabs.org (Postfix) with ESMTP id 7427E1DF36 for ; Sat, 18 Sep 2010 09:08:49 +1000 (EST) Received: by ozlabs.org (Postfix) id 6B599B70AB; Sat, 18 Sep 2010 09:08:43 +1000 (EST) Delivered-To: linuxppc-dev@ozlabs.org X-Greylist: delayed 904 seconds by postgrey-1.32 at bilbo; Sat, 18 Sep 2010 09:08:43 EST Received: from TX2EHSOBE010.bigfish.com (tx2ehsobe005.messaging.microsoft.com [65.55.88.15]) by ozlabs.org (Postfix) with ESMTP id 00DBDB70A8 for ; Sat, 18 Sep 2010 09:08:42 +1000 (EST) Received: from mail165-tx2-R.bigfish.com (10.9.14.241) by TX2EHSOBE010.bigfish.com (10.9.40.30) with Microsoft SMTP Server id 8.1.340.0; Fri, 17 Sep 2010 22:53:34 +0000 Received: from mail165-tx2 (localhost.localdomain [127.0.0.1]) by mail165-tx2-R.bigfish.com (Postfix) with ESMTP id 6850C34876C; Fri, 17 Sep 2010 22:53:34 +0000 (UTC) X-SpamScore: 3 X-BigFish: VS3(zzc8kzz1202hzz8275bh8275dhz2dh2a8h) Received: from mail165-tx2 (localhost.localdomain [127.0.0.1]) by mail165-tx2 (MessageSwitch) id 1284764013886793_3509; Fri, 17 Sep 2010 22:53:33 +0000 (UTC) Received: from TX2EHSMHS034.bigfish.com (unknown [10.9.14.242]) by mail165-tx2.bigfish.com (Postfix) with ESMTP id CA7EFB80054; Fri, 17 Sep 2010 22:53:33 +0000 (UTC) Received: from de01egw01.freescale.net (192.88.165.102) by TX2EHSMHS034.bigfish.com (10.9.99.134) with Microsoft SMTP Server (TLS) id 14.0.482.44; Fri, 17 Sep 2010 22:53:32 +0000 Received: from az33smr01.freescale.net (az33smr01.freescale.net [10.64.34.199]) by de01egw01.freescale.net (8.14.3/8.14.3) with ESMTP id o8HMrU3R004128; Fri, 17 Sep 2010 15:53:31 -0700 (MST) Received: from efes.am.freescale.net (efes.am.freescale.net [10.82.123.3]) by az33smr01.freescale.net (8.13.1/8.13.0) with ESMTP id o8HN69Sv002495; Fri, 17 Sep 2010 18:06:10 -0500 (CDT) From: Timur Tabi To: benh@kernel.crashing.org, linuxppc-dev@ozlabs.org, kumar.gala@freescale.com, linux-watchdog@vger.kernel.org Subject: [PATCH 2/2] powerpc/watchdog: allow the e500 watchdog driver to be compiled as a module Date: Fri, 17 Sep 2010 17:53:28 -0500 Message-ID: <1284764008-19469-2-git-send-email-timur@freescale.com> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1284764008-19469-1-git-send-email-timur@freescale.com> References: <1284764008-19469-1-git-send-email-timur@freescale.com> MIME-Version: 1.0 X-Reverse-DNS: de01egw01.freescale.net X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Register the __init and __exit functions in the PowerPC e500 watchdog driver as module entry/exit functions, and modify the Kconfig entry. Add a .release method for the PowerPC e500 watchdog driver, so that the watchdog is disabled when the driver is closed. Loosely based on original code from Jiang Yutang . Signed-off-by: Timur Tabi --- This patch requires: powerpc: export ppc_tb_freq so that modules can reference it drivers/watchdog/Kconfig | 5 ++++- drivers/watchdog/booke_wdt.c | 39 +++++++++++++++++++++++++++++++++++++-- 2 files changed, 41 insertions(+), 3 deletions(-) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 24efd8e..d9cf5a9 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -957,9 +957,12 @@ config PIKA_WDT the Warp platform. config BOOKE_WDT - bool "PowerPC Book-E Watchdog Timer" + tristate "PowerPC Book-E Watchdog Timer" depends on BOOKE || 4xx ---help--- + Watchdog driver for PowerPC e500 chips, such as the Freescale + MPC85xx SOCs. + Please see Documentation/watchdog/watchdog-api.txt for more information. diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c index 3d49671..a989998 100644 --- a/drivers/watchdog/booke_wdt.c +++ b/drivers/watchdog/booke_wdt.c @@ -4,7 +4,7 @@ * Author: Matthew McClintock * Maintainer: Kumar Gala * - * Copyright 2005, 2008 Freescale Semiconductor Inc. + * Copyright 2005, 2008, 2010 Freescale Semiconductor Inc. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -114,6 +114,27 @@ static void __booke_wdt_enable(void *data) mtspr(SPRN_TCR, val); } +/** + * booke_wdt_disable - disable the watchdog on the given CPU + * + * This function is called on each CPU. It disables the watchdog on that CPU. + * + * TCR[WRC] cannot be changed once it has been set to non-zero, but we can + * effectively disable the watchdog by setting its period to the maximum value. + */ +static void __booke_wdt_disable(void *data) +{ + u32 val; + + val = mfspr(SPRN_TCR); + val &= ~(TCR_WIE | WDTP_MASK); + mtspr(SPRN_TCR, val); + + /* clear status to make sure nothing is pending */ + __booke_wdt_ping(NULL); + +} + static ssize_t booke_wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -193,12 +214,21 @@ static int booke_wdt_open(struct inode *inode, struct file *file) return nonseekable_open(inode, file); } +static int booke_wdt_release(struct inode *inode, struct file *file) +{ + on_each_cpu(__booke_wdt_disable, NULL, 0); + booke_wdt_enabled = 0; + + return 0; +} + static const struct file_operations booke_wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = booke_wdt_write, .unlocked_ioctl = booke_wdt_ioctl, .open = booke_wdt_open, + .release = booke_wdt_release, }; static struct miscdevice booke_wdt_miscdev = { @@ -237,4 +267,9 @@ static int __init booke_wdt_init(void) return ret; } -device_initcall(booke_wdt_init); + +module_init(booke_wdt_init); +module_exit(booke_wdt_exit); + +MODULE_DESCRIPTION("PowerPC Book-E watchdog driver"); +MODULE_LICENSE("GPL");