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drivers/watchdog/ixp4xx_wdt.c
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/* |
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* drivers/char/watchdog/ixp4xx_wdt.c |
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* * Watchdog driver for Intel IXP4xx network processors * * Author: Deepak Saxena <dsaxena@plexity.net> * * Copyright 2004 (c) MontaVista, Software, Inc. * Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ |
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#include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/init.h> #include <linux/bitops.h> |
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#include <linux/uaccess.h> |
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#include <mach/hardware.h> |
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|
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static int nowayout = WATCHDOG_NOWAYOUT; |
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static int heartbeat = 60; /* (secs) Default is 1 minute */ static unsigned long wdt_status; static unsigned long boot_status; |
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static DEFINE_SPINLOCK(wdt_lock); |
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#define WDT_TICK_RATE (IXP4XX_PERIPHERAL_BUS_CLOCK * 1000000UL) #define WDT_IN_USE 0 #define WDT_OK_TO_CLOSE 1 |
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static void wdt_enable(void) |
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{ |
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spin_lock(&wdt_lock); |
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*IXP4XX_OSWK = IXP4XX_WDT_KEY; *IXP4XX_OSWE = 0; *IXP4XX_OSWT = WDT_TICK_RATE * heartbeat; *IXP4XX_OSWE = IXP4XX_WDT_COUNT_ENABLE | IXP4XX_WDT_RESET_ENABLE; *IXP4XX_OSWK = 0; |
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spin_unlock(&wdt_lock); |
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} |
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static void wdt_disable(void) |
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{ |
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spin_lock(&wdt_lock); |
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*IXP4XX_OSWK = IXP4XX_WDT_KEY; *IXP4XX_OSWE = 0; *IXP4XX_OSWK = 0; |
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spin_unlock(&wdt_lock); |
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} |
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static int ixp4xx_wdt_open(struct inode *inode, struct file *file) |
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{ if (test_and_set_bit(WDT_IN_USE, &wdt_status)) return -EBUSY; clear_bit(WDT_OK_TO_CLOSE, &wdt_status); |
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wdt_enable(); |
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return nonseekable_open(inode, file); } static ssize_t ixp4xx_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) { if (len) { if (!nowayout) { size_t i; clear_bit(WDT_OK_TO_CLOSE, &wdt_status); for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) return -EFAULT; if (c == 'V') set_bit(WDT_OK_TO_CLOSE, &wdt_status); } } wdt_enable(); } |
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return len; } |
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static const struct watchdog_info ident = { |
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.options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "IXP4xx Watchdog", }; |
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static long ixp4xx_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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{ |
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int ret = -ENOTTY; |
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int time; switch (cmd) { case WDIOC_GETSUPPORT: ret = copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)) ? -EFAULT : 0; break; case WDIOC_GETSTATUS: ret = put_user(0, (int *)arg); break; case WDIOC_GETBOOTSTATUS: ret = put_user(boot_status, (int *)arg); break; |
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case WDIOC_KEEPALIVE: wdt_enable(); ret = 0; break; |
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case WDIOC_SETTIMEOUT: ret = get_user(time, (int *)arg); if (ret) break; if (time <= 0 || time > 60) { ret = -EINVAL; break; } heartbeat = time; wdt_enable(); /* Fall through */ case WDIOC_GETTIMEOUT: ret = put_user(heartbeat, (int *)arg); break; |
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} return ret; } |
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static int ixp4xx_wdt_release(struct inode *inode, struct file *file) |
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{ |
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if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) |
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wdt_disable(); |
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else |
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printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - " |
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"timer will not stop "); |
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clear_bit(WDT_IN_USE, &wdt_status); clear_bit(WDT_OK_TO_CLOSE, &wdt_status); return 0; } |
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static const struct file_operations ixp4xx_wdt_fops = { |
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.owner = THIS_MODULE, .llseek = no_llseek, .write = ixp4xx_wdt_write, |
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.unlocked_ioctl = ixp4xx_wdt_ioctl, |
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.open = ixp4xx_wdt_open, .release = ixp4xx_wdt_release, }; |
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static struct miscdevice ixp4xx_wdt_miscdev = { |
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.minor = WATCHDOG_MINOR, |
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.name = "watchdog", |
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.fops = &ixp4xx_wdt_fops, }; static int __init ixp4xx_wdt_init(void) { int ret; |
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if (!(read_cpuid_id() & 0xf) && !cpu_is_ixp46x()) { |
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printk(KERN_ERR "IXP4XXX Watchdog: Rev. A0 IXP42x CPU detected" " - watchdog disabled "); |
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return -ENODEV; } |
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boot_status = (*IXP4XX_OSST & IXP4XX_OSST_TIMER_WARM_RESET) ? WDIOF_CARDRESET : 0; |
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ret = misc_register(&ixp4xx_wdt_miscdev); if (ret == 0) |
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printk(KERN_INFO "IXP4xx Watchdog Timer: heartbeat %d sec ", heartbeat); |
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return ret; } static void __exit ixp4xx_wdt_exit(void) { misc_deregister(&ixp4xx_wdt_miscdev); } module_init(ixp4xx_wdt_init); module_exit(ixp4xx_wdt_exit); MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>"); MODULE_DESCRIPTION("IXP4xx Network Processor Watchdog"); module_param(heartbeat, int, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)"); module_param(nowayout, int, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |