diff options
Diffstat (limited to 'drivers/char/watchdog/wdt977.c')
| -rw-r--r-- | drivers/char/watchdog/wdt977.c | 519 |
1 files changed, 0 insertions, 519 deletions
diff --git a/drivers/char/watchdog/wdt977.c b/drivers/char/watchdog/wdt977.c deleted file mode 100644 index 7d300ff7ab0..00000000000 --- a/drivers/char/watchdog/wdt977.c +++ /dev/null @@ -1,519 +0,0 @@ -/* - * Wdt977 0.04: A Watchdog Device for Netwinder W83977AF chip - * - * (c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.org>) - * - * ----------------------- - * - * 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. - * - * ----------------------- - * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com> - * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT - * 19-Dec-2001 Woody Suwalski: Netwinder fixes, ioctl interface - * 06-Jan-2002 Woody Suwalski: For compatibility, convert all timeouts - * from minutes to seconds. - * 07-Jul-2003 Daniele Bellucci: Audit return code of misc_register in - * nwwatchdog_init. - * 25-Oct-2005 Woody Suwalski: Convert addresses to #defs, add spinlocks - * remove limitiation to be used on Netwinders only - */ - -#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/init.h> -#include <linux/ioport.h> -#include <linux/watchdog.h> -#include <linux/notifier.h> -#include <linux/reboot.h> - -#include <asm/io.h> -#include <asm/system.h> -#include <asm/mach-types.h> -#include <asm/uaccess.h> - -#define WATCHDOG_VERSION "0.04" -#define WATCHDOG_NAME "Wdt977" -#define PFX WATCHDOG_NAME ": " -#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n" - -#define IO_INDEX_PORT 0x370 /* on some systems it can be 0x3F0 */ -#define IO_DATA_PORT (IO_INDEX_PORT+1) - -#define UNLOCK_DATA 0x87 -#define LOCK_DATA 0xAA -#define DEVICE_REGISTER 0x07 - - -#define DEFAULT_TIMEOUT 60 /* default timeout in seconds */ - -static int timeout = DEFAULT_TIMEOUT; -static int timeoutM; /* timeout in minutes */ -static unsigned long timer_alive; -static int testmode; -static char expect_close; -static spinlock_t spinlock; - -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout,"Watchdog timeout in seconds (60..15300), default=" __MODULE_STRING(DEFAULT_TIMEOUT) ")"); -module_param(testmode, int, 0); -MODULE_PARM_DESC(testmode,"Watchdog testmode (1 = no reboot), default=0"); - -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) ")"); - -/* - * Start the watchdog - */ - -static int wdt977_start(void) -{ - unsigned long flags; - - spin_lock_irqsave(&spinlock, flags); - - /* unlock the SuperIO chip */ - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - - /* select device Aux2 (device=8) and set watchdog regs F2, F3 and F4 - * F2 has the timeout in minutes - * F3 could be set to the POWER LED blink (with GP17 set to PowerLed) - * at timeout, and to reset timer on kbd/mouse activity (not impl.) - * F4 is used to just clear the TIMEOUT'ed state (bit 0) - */ - outb_p(DEVICE_REGISTER, IO_INDEX_PORT); - outb_p(0x08, IO_DATA_PORT); - outb_p(0xF2, IO_INDEX_PORT); - outb_p(timeoutM, IO_DATA_PORT); - outb_p(0xF3, IO_INDEX_PORT); - outb_p(0x00, IO_DATA_PORT); /* another setting is 0E for kbd/mouse/LED */ - outb_p(0xF4, IO_INDEX_PORT); - outb_p(0x00, IO_DATA_PORT); - - /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */ - /* in test mode watch the bit 1 on F4 to indicate "triggered" */ - if (!testmode) - { - outb_p(DEVICE_REGISTER, IO_INDEX_PORT); - outb_p(0x07, IO_DATA_PORT); - outb_p(0xE6, IO_INDEX_PORT); - outb_p(0x08, IO_DATA_PORT); - } - - /* lock the SuperIO chip */ - outb_p(LOCK_DATA, IO_INDEX_PORT); - - spin_unlock_irqrestore(&spinlock, flags); - printk(KERN_INFO PFX "activated.\n"); - - return 0; -} - -/* - * Stop the watchdog - */ - -static int wdt977_stop(void) -{ - unsigned long flags; - spin_lock_irqsave(&spinlock, flags); - - /* unlock the SuperIO chip */ - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - - /* select device Aux2 (device=8) and set watchdog regs F2,F3 and F4 - * F3 is reset to its default state - * F4 can clear the TIMEOUT'ed state (bit 0) - back to default - * We can not use GP17 as a PowerLed, as we use its usage as a RedLed - */ - outb_p(DEVICE_REGISTER, IO_INDEX_PORT); - outb_p(0x08, IO_DATA_PORT); - outb_p(0xF2, IO_INDEX_PORT); - outb_p(0xFF, IO_DATA_PORT); - outb_p(0xF3, IO_INDEX_PORT); - outb_p(0x00, IO_DATA_PORT); - outb_p(0xF4, IO_INDEX_PORT); - outb_p(0x00, IO_DATA_PORT); - outb_p(0xF2, IO_INDEX_PORT); - outb_p(0x00, IO_DATA_PORT); - - /* at last select device Aux1 (dev=7) and set GP16 as a watchdog output */ - outb_p(DEVICE_REGISTER, IO_INDEX_PORT); - outb_p(0x07, IO_DATA_PORT); - outb_p(0xE6, IO_INDEX_PORT); - outb_p(0x08, IO_DATA_PORT); - - /* lock the SuperIO chip */ - outb_p(LOCK_DATA, IO_INDEX_PORT); - - spin_unlock_irqrestore(&spinlock, flags); - printk(KERN_INFO PFX "shutdown.\n"); - - return 0; -} - -/* - * Send a keepalive ping to the watchdog - * This is done by simply re-writing the timeout to reg. 0xF2 - */ - -static int wdt977_keepalive(void) -{ - unsigned long flags; - spin_lock_irqsave(&spinlock, flags); - - /* unlock the SuperIO chip */ - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - - /* select device Aux2 (device=8) and kicks watchdog reg F2 */ - /* F2 has the timeout in minutes */ - outb_p(DEVICE_REGISTER, IO_INDEX_PORT); - outb_p(0x08, IO_DATA_PORT); - outb_p(0xF2, IO_INDEX_PORT); - outb_p(timeoutM, IO_DATA_PORT); - - /* lock the SuperIO chip */ - outb_p(LOCK_DATA, IO_INDEX_PORT); - spin_unlock_irqrestore(&spinlock, flags); - - return 0; -} - -/* - * Set the watchdog timeout value - */ - -static int wdt977_set_timeout(int t) -{ - int tmrval; - - /* convert seconds to minutes, rounding up */ - tmrval = (t + 59) / 60; - - if (machine_is_netwinder()) { - /* we have a hw bug somewhere, so each 977 minute is actually only 30sec - * this limits the max timeout to half of device max of 255 minutes... - */ - tmrval += tmrval; - } - - if ((tmrval < 1) || (tmrval > 255)) - return -EINVAL; - - /* timeout is the timeout in seconds, timeoutM is the timeout in minutes) */ - timeout = t; - timeoutM = tmrval; - return 0; -} - -/* - * Get the watchdog status - */ - -static int wdt977_get_status(int *status) -{ - int new_status; - unsigned long flags; - - spin_lock_irqsave(&spinlock, flags); - - /* unlock the SuperIO chip */ - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - outb_p(UNLOCK_DATA, IO_INDEX_PORT); - - /* select device Aux2 (device=8) and read watchdog reg F4 */ - outb_p(DEVICE_REGISTER, IO_INDEX_PORT); - outb_p(0x08, IO_DATA_PORT); - outb_p(0xF4, IO_INDEX_PORT); - new_status = inb_p(IO_DATA_PORT); - - /* lock the SuperIO chip */ - outb_p(LOCK_DATA, IO_INDEX_PORT); - - spin_unlock_irqrestore(&spinlock, flags); - - *status=0; - if (new_status & 1) - *status |= WDIOF_CARDRESET; - - return 0; -} - - -/* - * /dev/watchdog handling - */ - -static int wdt977_open(struct inode *inode, struct file *file) -{ - /* If the watchdog is alive we don't need to start it again */ - if( test_and_set_bit(0,&timer_alive) ) - return -EBUSY; - - if (nowayout) - __module_get(THIS_MODULE); - - wdt977_start(); - return nonseekable_open(inode, file); -} - -static int wdt977_release(struct inode *inode, struct file *file) -{ - /* - * Shut off the timer. - * Lock it in if it's a module and we set nowayout - */ - if (expect_close == 42) - { - wdt977_stop(); - clear_bit(0,&timer_alive); - } else { - wdt977_keepalive(); - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); - } - expect_close = 0; - return 0; -} - - -/* - * wdt977_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 wdt977_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; - } - } - - /* someone wrote to us, we should restart timer */ - wdt977_keepalive(); - } - return count; -} - -/* - * wdt977_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. - */ - -static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | - WDIOF_MAGICCLOSE | - WDIOF_KEEPALIVEPING, - .firmware_version = 1, - .identity = WATCHDOG_NAME, -}; - -static int wdt977_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - int status; - int new_options, retval = -EINVAL; - int new_timeout; - union { - struct watchdog_info __user *ident; - int __user *i; - } uarg; - - uarg.i = (int __user *)arg; - - switch(cmd) - { - default: - return -ENOTTY; - - case WDIOC_GETSUPPORT: - return copy_to_user(uarg.ident, &ident, - sizeof(ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - wdt977_get_status(&status); - return put_user(status, uarg.i); - - case WDIOC_GETBOOTSTATUS: - return put_user(0, uarg.i); - - case WDIOC_KEEPALIVE: - wdt977_keepalive(); - return 0; - - case WDIOC_SETOPTIONS: - if (get_user (new_options, uarg.i)) - return -EFAULT; - - if (new_options & WDIOS_DISABLECARD) { - wdt977_stop(); - retval = 0; - } - - if (new_options & WDIOS_ENABLECARD) { - wdt977_start(); - retval = 0; - } - - return retval; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, uarg.i)) - return -EFAULT; - - if (wdt977_set_timeout(new_timeout)) - return -EINVAL; - - wdt977_keepalive(); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(timeout, uarg.i); - - } -} - -static int wdt977_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if(code==SYS_DOWN || code==SYS_HALT) - wdt977_stop(); - return NOTIFY_DONE; -} - -static const struct file_operations wdt977_fops= -{ - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt977_write, - .ioctl = wdt977_ioctl, - .open = wdt977_open, - .release = wdt977_release, -}; - -static struct miscdevice wdt977_miscdev= -{ - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wdt977_fops, -}; - -static struct notifier_block wdt977_notifier = { - .notifier_call = wdt977_notify_sys, -}; - -static int __init wd977_init(void) -{ - int rc; - - //if (!machine_is_netwinder()) - // return -ENODEV; - - printk(KERN_INFO PFX DRIVER_VERSION); - - spin_lock_init(&spinlock); - - /* Check that the timeout value is within it's range ; if not reset to the default */ - if (wdt977_set_timeout(timeout)) - { - wdt977_set_timeout(DEFAULT_TIMEOUT); - printk(KERN_INFO PFX "timeout value must be 60<timeout<15300, using %d\n", - DEFAULT_TIMEOUT); - } - - /* on Netwinder the IOports are already reserved by - * arch/arm/mach-footbridge/netwinder-hw.c - */ - if (!machine_is_netwinder()) - { - if (!request_region(IO_INDEX_PORT, 2, WATCHDOG_NAME)) - { - printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", - IO_INDEX_PORT); - rc = -EIO; - goto err_out; - } - } - - rc = misc_register(&wdt977_miscdev); - if (rc) - { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - wdt977_miscdev.minor, rc); - goto err_out_region; - } - - rc = register_reboot_notifier(&wdt977_notifier); - if (rc) - { - printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - rc); - goto err_out_miscdev; - } - - printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d, testmode=%i)\n", - timeout, nowayout, testmode); - - return 0; - -err_out_miscdev: - misc_deregister(&wdt977_miscdev); -err_out_region: - if (!machine_is_netwinder()) - release_region(IO_INDEX_PORT,2); -err_out: - return rc; -} - -static void __exit wd977_exit(void) -{ - wdt977_stop(); - misc_deregister(&wdt977_miscdev); - unregister_reboot_notifier(&wdt977_notifier); - release_region(IO_INDEX_PORT,2); -} - -module_init(wd977_init); -module_exit(wd977_exit); - -MODULE_AUTHOR("Woody Suwalski <woodys@xandros.com>"); -MODULE_DESCRIPTION("W83977AF Watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |