diff options
Diffstat (limited to 'drivers/char/watchdog/scx200_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/scx200_wdt.c | 269 |
1 files changed, 0 insertions, 269 deletions
diff --git a/drivers/char/watchdog/scx200_wdt.c b/drivers/char/watchdog/scx200_wdt.c deleted file mode 100644 index d4fd0fa2f17..00000000000 --- a/drivers/char/watchdog/scx200_wdt.c +++ /dev/null @@ -1,269 +0,0 @@ -/* drivers/char/watchdog/scx200_wdt.c - - National Semiconductor SCx200 Watchdog support - - Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> - - Some code taken from: - National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver - (c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.com> - - 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. - - The author(s) of this software shall not be held liable for damages - of any nature resulting due to the use of this software. This - software is provided AS-IS with no warranties. */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/init.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/fs.h> -#include <linux/ioport.h> -#include <linux/scx200.h> - -#include <asm/uaccess.h> -#include <asm/io.h> - -#define NAME "scx200_wdt" - -MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); -MODULE_DESCRIPTION("NatSemi SCx200 Watchdog Driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - -static int margin = 60; /* in seconds */ -module_param(margin, int, 0); -MODULE_PARM_DESC(margin, "Watchdog margin in seconds"); - -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close"); - -static u16 wdto_restart; -static struct semaphore open_semaphore; -static char expect_close; - -/* Bits of the WDCNFG register */ -#define W_ENABLE 0x00fa /* Enable watchdog */ -#define W_DISABLE 0x0000 /* Disable watchdog */ - -/* The scaling factor for the timer, this depends on the value of W_ENABLE */ -#define W_SCALE (32768/1024) - -static void scx200_wdt_ping(void) -{ - outw(wdto_restart, scx200_cb_base + SCx200_WDT_WDTO); -} - -static void scx200_wdt_update_margin(void) -{ - printk(KERN_INFO NAME ": timer margin %d seconds\n", margin); - wdto_restart = margin * W_SCALE; -} - -static void scx200_wdt_enable(void) -{ - printk(KERN_DEBUG NAME ": enabling watchdog timer, wdto_restart = %d\n", - wdto_restart); - - outw(0, scx200_cb_base + SCx200_WDT_WDTO); - outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS); - outw(W_ENABLE, scx200_cb_base + SCx200_WDT_WDCNFG); - - scx200_wdt_ping(); -} - -static void scx200_wdt_disable(void) -{ - printk(KERN_DEBUG NAME ": disabling watchdog timer\n"); - - outw(0, scx200_cb_base + SCx200_WDT_WDTO); - outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS); - outw(W_DISABLE, scx200_cb_base + SCx200_WDT_WDCNFG); -} - -static int scx200_wdt_open(struct inode *inode, struct file *file) -{ - /* only allow one at a time */ - if (down_trylock(&open_semaphore)) - return -EBUSY; - scx200_wdt_enable(); - - return nonseekable_open(inode, file); -} - -static int scx200_wdt_release(struct inode *inode, struct file *file) -{ - if (expect_close != 42) { - printk(KERN_WARNING NAME ": watchdog device closed unexpectedly, will not disable the watchdog timer\n"); - } else if (!nowayout) { - scx200_wdt_disable(); - } - expect_close = 0; - up(&open_semaphore); - - return 0; -} - -static int scx200_wdt_notify_sys(struct notifier_block *this, - unsigned long code, void *unused) -{ - if (code == SYS_HALT || code == SYS_POWER_OFF) - if (!nowayout) - scx200_wdt_disable(); - - return NOTIFY_DONE; -} - -static struct notifier_block scx200_wdt_notifier = -{ - .notifier_call = scx200_wdt_notify_sys, -}; - -static ssize_t scx200_wdt_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - /* check for a magic close character */ - if (len) - { - size_t i; - - scx200_wdt_ping(); - - expect_close = 0; - for (i = 0; i < len; ++i) { - char c; - if (get_user(c, data+i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - - return len; - } - - return 0; -} - -static int scx200_wdt_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - static struct watchdog_info ident = { - .identity = "NatSemi SCx200 Watchdog", - .firmware_version = 1, - .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING), - }; - int new_margin; - - switch (cmd) { - default: - return -ENOTTY; - case WDIOC_GETSUPPORT: - if(copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - return 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - if (put_user(0, p)) - return -EFAULT; - return 0; - case WDIOC_KEEPALIVE: - scx200_wdt_ping(); - return 0; - case WDIOC_SETTIMEOUT: - if (get_user(new_margin, p)) - return -EFAULT; - if (new_margin < 1) - return -EINVAL; - margin = new_margin; - scx200_wdt_update_margin(); - scx200_wdt_ping(); - case WDIOC_GETTIMEOUT: - if (put_user(margin, p)) - return -EFAULT; - return 0; - } -} - -static const struct file_operations scx200_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = scx200_wdt_write, - .ioctl = scx200_wdt_ioctl, - .open = scx200_wdt_open, - .release = scx200_wdt_release, -}; - -static struct miscdevice scx200_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &scx200_wdt_fops, -}; - -static int __init scx200_wdt_init(void) -{ - int r; - - printk(KERN_DEBUG NAME ": NatSemi SCx200 Watchdog Driver\n"); - - /* check that we have found the configuration block */ - if (!scx200_cb_present()) - return -ENODEV; - - if (!request_region(scx200_cb_base + SCx200_WDT_OFFSET, - SCx200_WDT_SIZE, - "NatSemi SCx200 Watchdog")) { - printk(KERN_WARNING NAME ": watchdog I/O region busy\n"); - return -EBUSY; - } - - scx200_wdt_update_margin(); - scx200_wdt_disable(); - - sema_init(&open_semaphore, 1); - - r = misc_register(&scx200_wdt_miscdev); - if (r) { - release_region(scx200_cb_base + SCx200_WDT_OFFSET, - SCx200_WDT_SIZE); - return r; - } - - r = register_reboot_notifier(&scx200_wdt_notifier); - if (r) { - printk(KERN_ERR NAME ": unable to register reboot notifier"); - misc_deregister(&scx200_wdt_miscdev); - release_region(scx200_cb_base + SCx200_WDT_OFFSET, - SCx200_WDT_SIZE); - return r; - } - - return 0; -} - -static void __exit scx200_wdt_cleanup(void) -{ - unregister_reboot_notifier(&scx200_wdt_notifier); - misc_deregister(&scx200_wdt_miscdev); - release_region(scx200_cb_base + SCx200_WDT_OFFSET, - SCx200_WDT_SIZE); -} - -module_init(scx200_wdt_init); -module_exit(scx200_wdt_cleanup); - -/* - Local variables: - compile-command: "make -k -C ../.. SUBDIRS=drivers/char modules" - c-basic-offset: 8 - End: -*/ |