Ok2440-3看门狗驱动代码详细分析.doc

/*希望与各位共同学习,,蓝色把部分为代码自带的注释,紫色部分为我没理解透的地方(主要是我不不明白为什么要那些代码,它们主要起什么作用)。希望看到我的笔记的同行不吝赐教!
linux/drivers/char/watchdog/
*
* Copyright (c) 2004 Simtec Electronics
* Ben Dooks <******@>
*
* S3C2410 Watchdog Timer Support
*
* Based on, by Alan Cox,
* (c) Copyright 1996 Alan Cox <******@uk..uk>
*
* 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 Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <linux/>
#include <mach/>
#undef S3C_VA_WATCHDOG
#define S3C_VA_WATCHDOG (0)
#include <asm/plat-s3c/regs->
#define PFX "s3c2410-wdt: "
#define CONFIG_S3C2410_WATCHDOG_ATBOOT (0)
#define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME (15)
static int nowayout = WATCHDOG_NOWAYOUT;
static int tmr_margin = CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME;
static int tmr_atboot = CONFIG_S3C2410_WATCHDOG_ATBOOT;
static int soft_noboot;
static int debug;
module_param(tmr_margin, int, 0);
module_param(tmr_atboot, int, 0);
module_param(nowayout, int, 0);
mo