diff options
Diffstat (limited to 'drivers/char/watchdog/wdt285.c')
| -rw-r--r-- | drivers/char/watchdog/wdt285.c | 229 |
1 files changed, 0 insertions, 229 deletions
diff --git a/drivers/char/watchdog/wdt285.c b/drivers/char/watchdog/wdt285.c deleted file mode 100644 index e4cf661dc89..00000000000 --- a/drivers/char/watchdog/wdt285.c +++ /dev/null @@ -1,229 +0,0 @@ -/* - * Intel 21285 watchdog driver - * Copyright (c) Phil Blundell <pb@nexus.co.uk>, 1998 - * - * based on - * - * SoftDog 0.05: A Software Watchdog Device - * - * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. - * - * 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. - * - */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/interrupt.h> - -#include <asm/irq.h> -#include <asm/uaccess.h> -#include <asm/hardware.h> -#include <asm/mach-types.h> -#include <asm/hardware/dec21285.h> - -/* - * Define this to stop the watchdog actually rebooting the machine. - */ -#undef ONLY_TESTING - -static unsigned int soft_margin = 60; /* in seconds */ -static unsigned int reload; -static unsigned long timer_alive; - -#ifdef ONLY_TESTING -/* - * If the timer expires.. - */ -static void watchdog_fire(int irq, void *dev_id) -{ - printk(KERN_CRIT "Watchdog: Would Reboot.\n"); - *CSR_TIMER4_CNTL = 0; - *CSR_TIMER4_CLR = 0; -} -#endif - -/* - * Refresh the timer. - */ -static void watchdog_ping(void) -{ - *CSR_TIMER4_LOAD = reload; -} - -/* - * Allow only one person to hold it open - */ -static int watchdog_open(struct inode *inode, struct file *file) -{ - int ret; - - if (*CSR_SA110_CNTL & (1 << 13)) - return -EBUSY; - - if (test_and_set_bit(1, &timer_alive)) - return -EBUSY; - - reload = soft_margin * (mem_fclk_21285 / 256); - - *CSR_TIMER4_CLR = 0; - watchdog_ping(); - *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD - | TIMER_CNTL_DIV256; - -#ifdef ONLY_TESTING - ret = request_irq(IRQ_TIMER4, watchdog_fire, 0, "watchdog", NULL); - if (ret) { - *CSR_TIMER4_CNTL = 0; - clear_bit(1, &timer_alive); - } -#else - /* - * Setting this bit is irreversible; once enabled, there is - * no way to disable the watchdog. - */ - *CSR_SA110_CNTL |= 1 << 13; - - ret = 0; -#endif - nonseekable_open(inode, file); - return ret; -} - -/* - * Shut off the timer. - * Note: if we really have enabled the watchdog, there - * is no way to turn off. - */ -static int watchdog_release(struct inode *inode, struct file *file) -{ -#ifdef ONLY_TESTING - free_irq(IRQ_TIMER4, NULL); - clear_bit(1, &timer_alive); -#endif - return 0; -} - -static ssize_t -watchdog_write(struct file *file, const char *data, size_t len, loff_t *ppos) -{ - /* - * Refresh the timer. - */ - if (len) - watchdog_ping(); - - return len; -} - -static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT, - .identity = "Footbridge Watchdog", -}; - -static int -watchdog_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - unsigned int new_margin; - int ret = -ENOTTY; - - switch(cmd) { - case WDIOC_GETSUPPORT: - ret = 0; - if (copy_to_user((void *)arg, &ident, sizeof(ident))) - ret = -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - ret = put_user(0,(int *)arg); - break; - - case WDIOC_KEEPALIVE: - watchdog_ping(); - ret = 0; - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(new_margin, (int *)arg); - if (ret) - break; - - /* Arbitrary, can't find the card's limits */ - if (new_margin < 0 || new_margin > 60) { - ret = -EINVAL; - break; - } - - soft_margin = new_margin; - reload = soft_margin * (mem_fclk_21285 / 256); - watchdog_ping(); - /* Fall */ - case WDIOC_GETTIMEOUT: - ret = put_user(soft_margin, (int *)arg); - break; - } - return ret; -} - -static const struct file_operations watchdog_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = watchdog_write, - .ioctl = watchdog_ioctl, - .open = watchdog_open, - .release = watchdog_release, -}; - -static struct miscdevice watchdog_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &watchdog_fops, -}; - -static int __init footbridge_watchdog_init(void) -{ - int retval; - - if (machine_is_netwinder()) - return -ENODEV; - - retval = misc_register(&watchdog_miscdev); - if (retval < 0) - return retval; - - printk("Footbridge Watchdog Timer: 0.01, timer margin: %d sec\n", - soft_margin); - - if (machine_is_cats()) - printk("Warning: Watchdog reset may not work on this machine.\n"); - return 0; -} - -static void __exit footbridge_watchdog_exit(void) -{ - misc_deregister(&watchdog_miscdev); -} - -MODULE_AUTHOR("Phil Blundell <pb@nexus.co.uk>"); -MODULE_DESCRIPTION("Footbridge watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - -module_param(soft_margin, int, 0); -MODULE_PARM_DESC(soft_margin,"Watchdog timeout in seconds"); - -module_init(footbridge_watchdog_init); -module_exit(footbridge_watchdog_exit); |