diff options
Diffstat (limited to 'drivers/watchdog/ixp2000_wdt.c')
| -rw-r--r-- | drivers/watchdog/ixp2000_wdt.c | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/drivers/watchdog/ixp2000_wdt.c b/drivers/watchdog/ixp2000_wdt.c deleted file mode 100644 index 3f047a58d3a..00000000000 --- a/drivers/watchdog/ixp2000_wdt.c +++ /dev/null @@ -1,215 +0,0 @@ -/* - * drivers/char/watchdog/ixp2000_wdt.c - * - * Watchdog driver for Intel IXP2000 network processors - * - * Adapted from the IXP4xx watchdog driver by Lennert Buytenhek. - * The original version carries these notices: - * - * 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. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/timer.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 <linux/uaccess.h> -#include <mach/hardware.h> - -static bool nowayout = WATCHDOG_NOWAYOUT; -static unsigned int heartbeat = 60; /* (secs) Default is 1 minute */ -static unsigned long wdt_status; -static DEFINE_SPINLOCK(wdt_lock); - -#define WDT_IN_USE 0 -#define WDT_OK_TO_CLOSE 1 - -static unsigned long wdt_tick_rate; - -static void wdt_enable(void) -{ - spin_lock(&wdt_lock); - ixp2000_reg_write(IXP2000_RESET0, *(IXP2000_RESET0) | WDT_RESET_ENABLE); - ixp2000_reg_write(IXP2000_TWDE, WDT_ENABLE); - ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate); - ixp2000_reg_write(IXP2000_T4_CTL, TIMER_DIVIDER_256 | TIMER_ENABLE); - spin_unlock(&wdt_lock); -} - -static void wdt_disable(void) -{ - spin_lock(&wdt_lock); - ixp2000_reg_write(IXP2000_T4_CTL, 0); - spin_unlock(&wdt_lock); -} - -static void wdt_keepalive(void) -{ - spin_lock(&wdt_lock); - ixp2000_reg_write(IXP2000_T4_CLD, heartbeat * wdt_tick_rate); - spin_unlock(&wdt_lock); -} - -static int ixp2000_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 ixp2000_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_keepalive(); - } - - return len; -} - - -static const struct watchdog_info ident = { - .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | - WDIOF_KEEPALIVEPING, - .identity = "IXP2000 Watchdog", -}; - -static long ixp2000_wdt_ioctl(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(0, (int *)arg); - break; - - case WDIOC_KEEPALIVE: - wdt_enable(); - ret = 0; - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(time, (int *)arg); - if (ret) - break; - - if (time <= 0 || time > 60) { - ret = -EINVAL; - break; - } - - heartbeat = time; - wdt_keepalive(); - /* Fall through */ - - case WDIOC_GETTIMEOUT: - ret = put_user(heartbeat, (int *)arg); - break; - } - - return ret; -} - -static int ixp2000_wdt_release(struct inode *inode, struct file *file) -{ - if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) - wdt_disable(); - else - pr_crit("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 ixp2000_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = ixp2000_wdt_write, - .unlocked_ioctl = ixp2000_wdt_ioctl, - .open = ixp2000_wdt_open, - .release = ixp2000_wdt_release, -}; - -static struct miscdevice ixp2000_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &ixp2000_wdt_fops, -}; - -static int __init ixp2000_wdt_init(void) -{ - if ((*IXP2000_PRODUCT_ID & 0x001ffef0) == 0x00000000) { - pr_info("Unable to use IXP2000 watchdog due to IXP2800 erratum #25\n"); - return -EIO; - } - wdt_tick_rate = (*IXP2000_T1_CLD * HZ) / 256; - return misc_register(&ixp2000_wdt_miscdev); -} - -static void __exit ixp2000_wdt_exit(void) -{ - misc_deregister(&ixp2000_wdt_miscdev); -} - -module_init(ixp2000_wdt_init); -module_exit(ixp2000_wdt_exit); - -MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net>"); -MODULE_DESCRIPTION("IXP2000 Network Processor Watchdog"); - -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)"); - -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); - -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - |