diff options
Diffstat (limited to 'drivers/char/watchdog/ixp4xx_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/ixp4xx_wdt.c | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/drivers/char/watchdog/ixp4xx_wdt.c b/drivers/char/watchdog/ixp4xx_wdt.c deleted file mode 100644 index 5864bb865cf..00000000000 --- a/drivers/char/watchdog/ixp4xx_wdt.c +++ /dev/null @@ -1,225 +0,0 @@ -/* - * drivers/char/watchdog/ixp4xx_wdt.c - * - * 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. - */ - -#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> - -#include <asm/hardware.h> -#include <asm/uaccess.h> - -static int nowayout = WATCHDOG_NOWAYOUT; -static int heartbeat = 60; /* (secs) Default is 1 minute */ -static unsigned long wdt_status; -static unsigned long boot_status; - -#define WDT_TICK_RATE (IXP4XX_PERIPHERAL_BUS_CLOCK * 1000000UL) - -#define WDT_IN_USE 0 -#define WDT_OK_TO_CLOSE 1 - -static void -wdt_enable(void) -{ - *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; -} - -static void -wdt_disable(void) -{ - *IXP4XX_OSWK = IXP4XX_WDT_KEY; - *IXP4XX_OSWE = 0; - *IXP4XX_OSWK = 0; -} - -static int -ixp4xx_wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(WDT_IN_USE, &wdt_status)) - return -EBUSY; - - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - wdt_enable(); - - 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(); - } - - return len; -} - -static struct watchdog_info ident = { - .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE | - WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, - .identity = "IXP4xx Watchdog", -}; - - -static int -ixp4xx_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - int ret = -ENOTTY; - 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; - - 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; - - case WDIOC_KEEPALIVE: - wdt_enable(); - ret = 0; - break; - } - return ret; -} - -static int -ixp4xx_wdt_release(struct inode *inode, struct file *file) -{ - if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) { - wdt_disable(); - } else { - printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - " - "timer will not stop\n"); - } - - clear_bit(WDT_IN_USE, &wdt_status); - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - return 0; -} - - -static const struct file_operations ixp4xx_wdt_fops = -{ - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = ixp4xx_wdt_write, - .ioctl = ixp4xx_wdt_ioctl, - .open = ixp4xx_wdt_open, - .release = ixp4xx_wdt_release, -}; - -static struct miscdevice ixp4xx_wdt_miscdev = -{ - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &ixp4xx_wdt_fops, -}; - -static int __init ixp4xx_wdt_init(void) -{ - int ret; - unsigned long processor_id; - - asm("mrc p15, 0, %0, cr0, cr0, 0;" : "=r"(processor_id) :); - if (!(processor_id & 0xf) && !cpu_is_ixp46x()) { - printk("IXP4XXX Watchdog: Rev. A0 IXP42x CPU detected - " - "watchdog disabled\n"); - - return -ENODEV; - } - - ret = misc_register(&ixp4xx_wdt_miscdev); - if (ret == 0) - printk("IXP4xx Watchdog Timer: heartbeat %d sec\n", heartbeat); - - boot_status = (*IXP4XX_OSST & IXP4XX_OSST_TIMER_WARM_RESET) ? - WDIOF_CARDRESET : 0; - - 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); - |