diff options
Diffstat (limited to 'drivers/char/watchdog/w83977f_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/w83977f_wdt.c | 542 |
1 files changed, 0 insertions, 542 deletions
diff --git a/drivers/char/watchdog/w83977f_wdt.c b/drivers/char/watchdog/w83977f_wdt.c deleted file mode 100644 index 15796844289..00000000000 --- a/drivers/char/watchdog/w83977f_wdt.c +++ /dev/null @@ -1,542 +0,0 @@ -/* - * W83977F Watchdog Timer Driver for Winbond W83977F I/O Chip - * - * (c) Copyright 2005 Jose Goncalves <jose.goncalves@inov.pt> - * - * Based on w83877f_wdt.c by Scott Jennings, - * and wdt977.c by Woody Suwalski - * - * ----------------------- - * - * 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/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/uaccess.h> - -#define WATCHDOG_VERSION "1.00" -#define WATCHDOG_NAME "W83977F WDT" -#define PFX WATCHDOG_NAME ": " -#define DRIVER_VERSION WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n" - -#define IO_INDEX_PORT 0x3F0 -#define IO_DATA_PORT (IO_INDEX_PORT+1) - -#define UNLOCK_DATA 0x87 -#define LOCK_DATA 0xAA -#define DEVICE_REGISTER 0x07 - -#define DEFAULT_TIMEOUT 45 /* default timeout in seconds */ - -static int timeout = DEFAULT_TIMEOUT; -static int timeoutW; /* timeout in watchdog counter units */ -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 (15..7635), 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 wdt_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) to set watchdog regs F2, F3 and F4. - * F2 has the timeout in watchdog counter units. - * F3 is set to enable watchdog LED blink at timeout. - * 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(timeoutW,IO_DATA_PORT); - outb_p(0xF3,IO_INDEX_PORT); - outb_p(0x08,IO_DATA_PORT); - outb_p(0xF4,IO_INDEX_PORT); - outb_p(0x00,IO_DATA_PORT); - - /* Set device Aux2 active */ - outb_p(0x30,IO_INDEX_PORT); - outb_p(0x01,IO_DATA_PORT); - - /* - * Select device Aux1 (dev=7) to set GP16 as the watchdog output - * (in reg E6) and GP13 as the watchdog LED output (in reg E3). - * Map GP16 at pin 119. - * In test mode watch the bit 0 on F4 to indicate "triggered" or - * check watchdog LED on SBC. - */ - outb_p(DEVICE_REGISTER,IO_INDEX_PORT); - outb_p(0x07,IO_DATA_PORT); - if (!testmode) - { - unsigned pin_map; - - outb_p(0xE6,IO_INDEX_PORT); - outb_p(0x0A,IO_DATA_PORT); - outb_p(0x2C,IO_INDEX_PORT); - pin_map = inb_p(IO_DATA_PORT); - pin_map |= 0x10; - pin_map &= ~(0x20); - outb_p(0x2C,IO_INDEX_PORT); - outb_p(pin_map,IO_DATA_PORT); - } - outb_p(0xE3,IO_INDEX_PORT); - outb_p(0x08,IO_DATA_PORT); - - /* Set device Aux1 active */ - outb_p(0x30,IO_INDEX_PORT); - outb_p(0x01,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 wdt_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) to set watchdog regs F2, F3 and F4. - * F2 is reset to its default value (watchdog timer disabled). - * F3 is reset to its default state. - * F4 clears the TIMEOUT'ed state (bit 0) - back to default. - */ - 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); - - /* - * Select device Aux1 (dev=7) to set GP16 (in reg E6) and - * Gp13 (in reg E3) as inputs. - */ - outb_p(DEVICE_REGISTER,IO_INDEX_PORT); - outb_p(0x07,IO_DATA_PORT); - if (!testmode) - { - outb_p(0xE6,IO_INDEX_PORT); - outb_p(0x01,IO_DATA_PORT); - } - outb_p(0xE3,IO_INDEX_PORT); - outb_p(0x01,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 wdt_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) to kick watchdog reg F2 */ - outb_p(DEVICE_REGISTER,IO_INDEX_PORT); - outb_p(0x08,IO_DATA_PORT); - outb_p(0xF2,IO_INDEX_PORT); - outb_p(timeoutW,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 wdt_set_timeout(int t) -{ - int tmrval; - - /* - * Convert seconds to watchdog counter time units, rounding up. - * On PCM-5335 watchdog units are 30 seconds/step with 15 sec startup - * value. This information is supplied in the PCM-5335 manual and was - * checked by me on a real board. This is a bit strange because W83977f - * datasheet says counter unit is in minutes! - */ - if (t < 15) - return -EINVAL; - - tmrval = ((t + 15) + 29) / 30; - - if (tmrval > 255) - return -EINVAL; - - /* - * timeout is the timeout in seconds, - * timeoutW is the timeout in watchdog counter units. - */ - timeoutW = tmrval; - timeout = (timeoutW * 30) - 15; - return 0; -} - -/* - * Get the watchdog status - */ - -static int wdt_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) to 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 wdt_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); - - wdt_start(); - return nonseekable_open(inode, file); -} - -static int wdt_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) - { - wdt_stop(); - clear_bit(0, &timer_alive); - } else { - wdt_keepalive(); - printk(KERN_CRIT PFX "unexpected close, not stopping watchdog!\n"); - } - expect_close = 0; - return 0; -} - -/* - * 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) -{ - /* See if we got the magic character 'V' and reload the timer */ - if(count) - { - if (!nowayout) - { - size_t ofs; - - /* note: just in case someone wrote the magic character long ago */ - expect_close = 0; - - /* scan to see whether or not we got the magic character */ - for(ofs = 0; ofs != count; ofs++) - { - char c; - if (get_user(c, buf + ofs)) - return -EFAULT; - if (c == 'V') { - expect_close = 42; - } - } - } - - /* someone wrote to us, we should restart timer */ - wdt_keepalive(); - } - 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. - */ - -static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, - .firmware_version = 1, - .identity = WATCHDOG_NAME, -}; - -static int wdt_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: - wdt_get_status(&status); - return put_user(status, uarg.i); - - case WDIOC_GETBOOTSTATUS: - return put_user(0, uarg.i); - - case WDIOC_KEEPALIVE: - wdt_keepalive(); - return 0; - - case WDIOC_SETOPTIONS: - if (get_user (new_options, uarg.i)) - return -EFAULT; - - if (new_options & WDIOS_DISABLECARD) { - wdt_stop(); - retval = 0; - } - - if (new_options & WDIOS_ENABLECARD) { - wdt_start(); - retval = 0; - } - - return retval; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, uarg.i)) - return -EFAULT; - - if (wdt_set_timeout(new_timeout)) - return -EINVAL; - - wdt_keepalive(); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(timeout, uarg.i); - - } -} - -static int wdt_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code==SYS_DOWN || code==SYS_HALT) - wdt_stop(); - return NOTIFY_DONE; -} - -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, -}; - -static struct notifier_block wdt_notifier = { - .notifier_call = wdt_notify_sys, -}; - -static int __init w83977f_wdt_init(void) -{ - int rc; - - 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 (wdt_set_timeout(timeout)) { - wdt_set_timeout(DEFAULT_TIMEOUT); - printk(KERN_INFO PFX "timeout value must be 15<=timeout<=7635, using %d\n", - DEFAULT_TIMEOUT); - } - - 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(&wdt_miscdev); - if (rc) - { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - wdt_miscdev.minor, rc); - goto err_out_region; - } - - rc = register_reboot_notifier(&wdt_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=%d)\n", - timeout, nowayout, testmode); - - return 0; - -err_out_miscdev: - misc_deregister(&wdt_miscdev); -err_out_region: - release_region(IO_INDEX_PORT,2); -err_out: - return rc; -} - -static void __exit w83977f_wdt_exit(void) -{ - wdt_stop(); - misc_deregister(&wdt_miscdev); - unregister_reboot_notifier(&wdt_notifier); - release_region(IO_INDEX_PORT,2); -} - -module_init(w83977f_wdt_init); -module_exit(w83977f_wdt_exit); - -MODULE_AUTHOR("Jose Goncalves <jose.goncalves@inov.pt>"); -MODULE_DESCRIPTION("Driver for watchdog timer in W83977F I/O chip"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |