diff options
Diffstat (limited to 'drivers/char/watchdog/wdt.c')
| -rw-r--r-- | drivers/char/watchdog/wdt.c | 640 |
1 files changed, 0 insertions, 640 deletions
diff --git a/drivers/char/watchdog/wdt.c b/drivers/char/watchdog/wdt.c deleted file mode 100644 index 0a3de6a02442..000000000000 --- a/drivers/char/watchdog/wdt.c +++ /dev/null @@ -1,640 +0,0 @@ -/* - * Industrial Computer Source WDT500/501 driver - * - * (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved. - * http://www.redhat.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. - * - * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - * - * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> - * - * Release 0.10. - * - * Fixes - * Dave Gregorich : Modularisation and minor bugs - * Alan Cox : Added the watchdog ioctl() stuff - * Alan Cox : Fixed the reboot problem (as noted by - * Matt Crocker). - * Alan Cox : Added wdt= boot option - * Alan Cox : Cleaned up copy/user stuff - * Tim Hockin : Added insmod parameters, comment cleanup - * Parameterized timeout - * Tigran Aivazian : Restructured wdt_init() to handle failures - * Joel Becker : Added WDIOC_GET/SETTIMEOUT - * Matt Domsch : Added nowayout module option - */ - -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/fs.h> -#include <linux/ioport.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> - -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/system.h> -#include "wd501p.h" - -static unsigned long wdt_is_open; -static char expect_close; - -/* - * Module parameters - */ - -#define WD_TIMO 60 /* Default heartbeat = 60 seconds */ - -static int heartbeat = WD_TIMO; -static int wd_heartbeat; -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")"); - -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -/* You must set these - there is no sane way to probe for this board. */ -static int io=0x240; -static int irq=11; - -module_param(io, int, 0); -MODULE_PARM_DESC(io, "WDT io port (default=0x240)"); -module_param(irq, int, 0); -MODULE_PARM_DESC(irq, "WDT irq (default=11)"); - -#ifdef CONFIG_WDT_501 -/* Support for the Fan Tachometer on the WDT501-P */ -static int tachometer; - -module_param(tachometer, int, 0); -MODULE_PARM_DESC(tachometer, "WDT501-P Fan Tachometer support (0=disable, default=0)"); -#endif /* CONFIG_WDT_501 */ - -/* - * Programming support - */ - -static void wdt_ctr_mode(int ctr, int mode) -{ - ctr<<=6; - ctr|=0x30; - ctr|=(mode<<1); - outb_p(ctr, WDT_CR); -} - -static void wdt_ctr_load(int ctr, int val) -{ - outb_p(val&0xFF, WDT_COUNT0+ctr); - outb_p(val>>8, WDT_COUNT0+ctr); -} - -/** - * wdt_start: - * - * Start the watchdog driver. - */ - -static int wdt_start(void) -{ - inb_p(WDT_DC); /* Disable watchdog */ - wdt_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ - wdt_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ - wdt_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ - wdt_ctr_load(0, 8948); /* Count at 100Hz */ - wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ - wdt_ctr_load(2,65535); /* Length of reset pulse */ - outb_p(0, WDT_DC); /* Enable watchdog */ - return 0; -} - -/** - * wdt_stop: - * - * Stop the watchdog driver. - */ - -static int wdt_stop (void) -{ - /* Turn the card off */ - inb_p(WDT_DC); /* Disable watchdog */ - wdt_ctr_load(2,0); /* 0 length reset pulses now */ - return 0; -} - -/** - * wdt_ping: - * - * Reload counter one with the watchdog heartbeat. We don't bother reloading - * the cascade counter. - */ - -static int wdt_ping(void) -{ - /* Write a watchdog value */ - inb_p(WDT_DC); /* Disable watchdog */ - wdt_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ - wdt_ctr_load(1,wd_heartbeat); /* Heartbeat */ - outb_p(0, WDT_DC); /* Enable watchdog */ - return 0; -} - -/** - * wdt_set_heartbeat: - * @t: the new heartbeat value that needs to be set. - * - * Set a new heartbeat value for the watchdog device. If the heartbeat value is - * incorrect we keep the old value and return -EINVAL. If successfull we - * return 0. - */ -static int wdt_set_heartbeat(int t) -{ - if ((t < 1) || (t > 65535)) - return -EINVAL; - - heartbeat = t; - wd_heartbeat = t * 100; - return 0; -} - -/** - * wdt_get_status: - * @status: the new status. - * - * Extract the status information from a WDT watchdog device. There are - * several board variants so we have to know which bits are valid. Some - * bits default to one and some to zero in order to be maximally painful. - * - * we then map the bits onto the status ioctl flags. - */ - -static int wdt_get_status(int *status) -{ - unsigned char new_status=inb_p(WDT_SR); - - *status=0; - if (new_status & WDC_SR_ISOI0) - *status |= WDIOF_EXTERN1; - if (new_status & WDC_SR_ISII1) - *status |= WDIOF_EXTERN2; -#ifdef CONFIG_WDT_501 - if (!(new_status & WDC_SR_TGOOD)) - *status |= WDIOF_OVERHEAT; - if (!(new_status & WDC_SR_PSUOVER)) - *status |= WDIOF_POWEROVER; - if (!(new_status & WDC_SR_PSUUNDR)) - *status |= WDIOF_POWERUNDER; - if (tachometer) { - if (!(new_status & WDC_SR_FANGOOD)) - *status |= WDIOF_FANFAULT; - } -#endif /* CONFIG_WDT_501 */ - return 0; -} - -#ifdef CONFIG_WDT_501 -/** - * wdt_get_temperature: - * - * Reports the temperature in degrees Fahrenheit. The API is in - * farenheit. It was designed by an imperial measurement luddite. - */ - -static int wdt_get_temperature(int *temperature) -{ - unsigned short c=inb_p(WDT_RT); - - *temperature = (c * 11 / 15) + 7; - return 0; -} -#endif /* CONFIG_WDT_501 */ - -/** - * wdt_interrupt: - * @irq: Interrupt number - * @dev_id: Unused as we don't allow multiple devices. - * - * Handle an interrupt from the board. These are raised when the status - * map changes in what the board considers an interesting way. That means - * a failure condition occurring. - */ - -static irqreturn_t wdt_interrupt(int irq, void *dev_id) -{ - /* - * Read the status register see what is up and - * then printk it. - */ - unsigned char status=inb_p(WDT_SR); - - printk(KERN_CRIT "WDT status %d\n", status); - -#ifdef CONFIG_WDT_501 - if (!(status & WDC_SR_TGOOD)) - printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT)); - if (!(status & WDC_SR_PSUOVER)) - printk(KERN_CRIT "PSU over voltage.\n"); - if (!(status & WDC_SR_PSUUNDR)) - printk(KERN_CRIT "PSU under voltage.\n"); - if (tachometer) { - if (!(status & WDC_SR_FANGOOD)) - printk(KERN_CRIT "Possible fan fault.\n"); - } -#endif /* CONFIG_WDT_501 */ - if (!(status & WDC_SR_WCCR)) -#ifdef SOFTWARE_REBOOT -#ifdef ONLY_TESTING - printk(KERN_CRIT "Would Reboot.\n"); -#else - printk(KERN_CRIT "Initiating system reboot.\n"); - emergency_restart(); -#endif -#else - printk(KERN_CRIT "Reset in 5ms.\n"); -#endif - return IRQ_HANDLED; -} - - -/** - * wdt_write: - * @file: file handle to the watchdog - * @buf: buffer to write (unused as data does not matter here - * @count: count of bytes - * @ppos: pointer to the position to write. No seeks allowed - * - * A write to a watchdog device is defined as a keepalive signal. Any - * write of data will do, as we we don't define content meaning. - */ - -static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) -{ - if(count) { - if (!nowayout) { - size_t i; - - /* In case it was set long ago */ - expect_close = 0; - - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - wdt_ping(); - } - return count; -} - -/** - * wdt_ioctl: - * @inode: inode of the device - * @file: file handle to the device - * @cmd: watchdog command - * @arg: argument pointer - * - * The watchdog API defines a common set of functions for all watchdogs - * according to their available features. We only actually usefully support - * querying capabilities and current status. - */ - -static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_heartbeat; - int status; - - static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT| - WDIOF_MAGICCLOSE| - WDIOF_KEEPALIVEPING, - .firmware_version = 1, - .identity = "WDT500/501", - }; - - /* Add options according to the card we have */ - ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); -#ifdef CONFIG_WDT_501 - ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); - if (tachometer) - ident.options |= WDIOF_FANFAULT; -#endif /* CONFIG_WDT_501 */ - - switch(cmd) - { - default: - return -ENOTTY; - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; - - case WDIOC_GETSTATUS: - wdt_get_status(&status); - return put_user(status, p); - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - case WDIOC_KEEPALIVE: - wdt_ping(); - return 0; - case WDIOC_SETTIMEOUT: - if (get_user(new_heartbeat, p)) - return -EFAULT; - - if (wdt_set_heartbeat(new_heartbeat)) - return -EINVAL; - - wdt_ping(); - /* Fall */ - case WDIOC_GETTIMEOUT: - return put_user(heartbeat, p); - } -} - -/** - * wdt_open: - * @inode: inode of device - * @file: file handle to device - * - * The watchdog device has been opened. The watchdog device is single - * open and on opening we load the counters. Counter zero is a 100Hz - * cascade, into counter 1 which downcounts to reboot. When the counter - * triggers counter 2 downcounts the length of the reset pulse which - * set set to be as long as possible. - */ - -static int wdt_open(struct inode *inode, struct file *file) -{ - if(test_and_set_bit(0, &wdt_is_open)) - return -EBUSY; - /* - * Activate - */ - wdt_start(); - return nonseekable_open(inode, file); -} - -/** - * wdt_release: - * @inode: inode to board - * @file: file handle to board - * - * The watchdog has a configurable API. There is a religious dispute - * between people who want their watchdog to be able to shut down and - * those who want to be sure if the watchdog manager dies the machine - * reboots. In the former case we disable the counters, in the latter - * case you have to open it again very soon. - */ - -static int wdt_release(struct inode *inode, struct file *file) -{ - if (expect_close == 42) { - wdt_stop(); - clear_bit(0, &wdt_is_open); - } else { - printk(KERN_CRIT "wdt: WDT device closed unexpectedly. WDT will not stop!\n"); - wdt_ping(); - } - expect_close = 0; - return 0; -} - -#ifdef CONFIG_WDT_501 -/** - * wdt_temp_read: - * @file: file handle to the watchdog board - * @buf: buffer to write 1 byte into - * @count: length of buffer - * @ptr: offset (no seek allowed) - * - * Temp_read reports the temperature in degrees Fahrenheit. The API is in - * farenheit. It was designed by an imperial measurement luddite. - */ - -static ssize_t wdt_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) -{ - int temperature; - - if (wdt_get_temperature(&temperature)) - return -EFAULT; - - if (copy_to_user (buf, &temperature, 1)) - return -EFAULT; - - return 1; -} - -/** - * wdt_temp_open: - * @inode: inode of device - * @file: file handle to device - * - * The temperature device has been opened. - */ - -static int wdt_temp_open(struct inode *inode, struct file *file) -{ - return nonseekable_open(inode, file); -} - -/** - * wdt_temp_release: - * @inode: inode to board - * @file: file handle to board - * - * The temperature device has been closed. - */ - -static int wdt_temp_release(struct inode *inode, struct file *file) -{ - return 0; -} -#endif /* CONFIG_WDT_501 */ - -/** - * notify_sys: - * @this: our notifier block - * @code: the event being reported - * @unused: unused - * - * Our notifier is called on system shutdowns. We want to turn the card - * off at reboot otherwise the machine will reboot again during memory - * test or worse yet during the following fsck. This would suck, in fact - * trust me - if it happens it does suck. - */ - -static int wdt_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if(code==SYS_DOWN || code==SYS_HALT) { - /* Turn the card off */ - wdt_stop(); - } - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - - -static const struct file_operations wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt_write, - .ioctl = wdt_ioctl, - .open = wdt_open, - .release = wdt_release, -}; - -static struct miscdevice wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wdt_fops, -}; - -#ifdef CONFIG_WDT_501 -static const struct file_operations wdt_temp_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .read = wdt_temp_read, - .open = wdt_temp_open, - .release = wdt_temp_release, -}; - -static struct miscdevice temp_miscdev = { - .minor = TEMP_MINOR, - .name = "temperature", - .fops = &wdt_temp_fops, -}; -#endif /* CONFIG_WDT_501 */ - -/* - * The WDT card needs to learn about soft shutdowns in order to - * turn the timebomb registers off. - */ - -static struct notifier_block wdt_notifier = { - .notifier_call = wdt_notify_sys, -}; - -/** - * cleanup_module: - * - * Unload the watchdog. You cannot do this with any file handles open. - * If your watchdog is set to continue ticking on close and you unload - * it, well it keeps ticking. We won't get the interrupt but the board - * will not touch PC memory so all is fine. You just have to load a new - * module in 60 seconds or reboot. - */ - -static void __exit wdt_exit(void) -{ - misc_deregister(&wdt_miscdev); -#ifdef CONFIG_WDT_501 - misc_deregister(&temp_miscdev); -#endif /* CONFIG_WDT_501 */ - unregister_reboot_notifier(&wdt_notifier); - free_irq(irq, NULL); - release_region(io,8); -} - -/** - * wdt_init: - * - * Set up the WDT watchdog board. All we have to do is grab the - * resources we require and bitch if anyone beat us to them. - * The open() function will actually kick the board off. - */ - -static int __init wdt_init(void) -{ - int ret; - - /* Check that the heartbeat value is within it's range ; if not reset to the default */ - if (wdt_set_heartbeat(heartbeat)) { - wdt_set_heartbeat(WD_TIMO); - printk(KERN_INFO "wdt: heartbeat value must be 0<heartbeat<65536, using %d\n", - WD_TIMO); - } - - if (!request_region(io, 8, "wdt501p")) { - printk(KERN_ERR "wdt: I/O address 0x%04x already in use\n", io); - ret = -EBUSY; - goto out; - } - - ret = request_irq(irq, wdt_interrupt, IRQF_DISABLED, "wdt501p", NULL); - if(ret) { - printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq); - goto outreg; - } - - ret = register_reboot_notifier(&wdt_notifier); - if(ret) { - printk(KERN_ERR "wdt: cannot register reboot notifier (err=%d)\n", ret); - goto outirq; - } - -#ifdef CONFIG_WDT_501 - ret = misc_register(&temp_miscdev); - if (ret) { - printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", - TEMP_MINOR, ret); - goto outrbt; - } -#endif /* CONFIG_WDT_501 */ - - ret = misc_register(&wdt_miscdev); - if (ret) { - printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto outmisc; - } - - ret = 0; - printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n", - io, irq, heartbeat, nowayout); -#ifdef CONFIG_WDT_501 - printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled")); -#endif /* CONFIG_WDT_501 */ - -out: - return ret; - -outmisc: -#ifdef CONFIG_WDT_501 - misc_deregister(&temp_miscdev); -outrbt: -#endif /* CONFIG_WDT_501 */ - unregister_reboot_notifier(&wdt_notifier); -outirq: - free_irq(irq, NULL); -outreg: - release_region(io,8); - goto out; -} - -module_init(wdt_init); -module_exit(wdt_exit); - -MODULE_AUTHOR("Alan Cox"); -MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); -MODULE_ALIAS_MISCDEV(TEMP_MINOR); -MODULE_LICENSE("GPL"); |