diff options
Diffstat (limited to 'drivers/char/watchdog/ib700wdt.c')
| -rw-r--r-- | drivers/char/watchdog/ib700wdt.c | 408 |
1 files changed, 0 insertions, 408 deletions
diff --git a/drivers/char/watchdog/ib700wdt.c b/drivers/char/watchdog/ib700wdt.c deleted file mode 100644 index c3a60f52ccb9..000000000000 --- a/drivers/char/watchdog/ib700wdt.c +++ /dev/null @@ -1,408 +0,0 @@ -/* - * IB700 Single Board Computer WDT driver - * - * (c) Copyright 2001 Charles Howes <chowes@vsol.net> - * - * Based on advantechwdt.c which is based on acquirewdt.c which - * is based on wdt.c. - * - * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> - * - * Based on acquirewdt.c which is based on wdt.c. - * Original copyright messages: - * - * (c) Copyright 1996 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@redhat.com> - * - * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com> - * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT - * Added timeout module option to override default - * - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/ioport.h> -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/moduleparam.h> -#include <linux/platform_device.h> - -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/system.h> - -static struct platform_device *ibwdt_platform_device; -static unsigned long ibwdt_is_open; -static spinlock_t ibwdt_lock; -static char expect_close; - -/* Module information */ -#define DRV_NAME "ib700wdt" -#define PFX DRV_NAME ": " - -/* - * - * Watchdog Timer Configuration - * - * The function of the watchdog timer is to reset the system - * automatically and is defined at I/O port 0443H. To enable the - * watchdog timer and allow the system to reset, write I/O port 0443H. - * To disable the timer, write I/O port 0441H for the system to stop the - * watchdog function. The timer has a tolerance of 20% for its - * intervals. - * - * The following describes how the timer should be programmed. - * - * Enabling Watchdog: - * MOV AX,000FH (Choose the values from 0 to F) - * MOV DX,0443H - * OUT DX,AX - * - * Disabling Watchdog: - * MOV AX,000FH (Any value is fine.) - * MOV DX,0441H - * OUT DX,AX - * - * Watchdog timer control table: - * Level Value Time/sec | Level Value Time/sec - * 1 F 0 | 9 7 16 - * 2 E 2 | 10 6 18 - * 3 D 4 | 11 5 20 - * 4 C 6 | 12 4 22 - * 5 B 8 | 13 3 24 - * 6 A 10 | 14 2 26 - * 7 9 12 | 15 1 28 - * 8 8 14 | 16 0 30 - * - */ - -static int wd_times[] = { - 30, /* 0x0 */ - 28, /* 0x1 */ - 26, /* 0x2 */ - 24, /* 0x3 */ - 22, /* 0x4 */ - 20, /* 0x5 */ - 18, /* 0x6 */ - 16, /* 0x7 */ - 14, /* 0x8 */ - 12, /* 0x9 */ - 10, /* 0xA */ - 8, /* 0xB */ - 6, /* 0xC */ - 4, /* 0xD */ - 2, /* 0xE */ - 0, /* 0xF */ -}; - -#define WDT_STOP 0x441 -#define WDT_START 0x443 - -/* Default timeout */ -#define WD_TIMO 0 /* 30 seconds +/- 20%, from table */ - -static int wd_margin = 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) ")"); - - -/* - * Watchdog Operations - */ - -static void -ibwdt_ping(void) -{ - spin_lock(&ibwdt_lock); - - /* Write a watchdog value */ - outb_p(wd_margin, WDT_START); - - spin_unlock(&ibwdt_lock); -} - -static void -ibwdt_disable(void) -{ - spin_lock(&ibwdt_lock); - outb_p(0, WDT_STOP); - spin_unlock(&ibwdt_lock); -} - -static int -ibwdt_set_heartbeat(int t) -{ - int i; - - if ((t < 0) || (t > 30)) - return -EINVAL; - - for (i = 0x0F; i > -1; i--) - if (wd_times[i] > t) - break; - wd_margin = i; - return 0; -} - -/* - * /dev/watchdog handling - */ - -static ssize_t -ibwdt_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; - } - } - ibwdt_ping(); - } - return count; -} - -static int -ibwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - int new_margin; - void __user *argp = (void __user *)arg; - int __user *p = argp; - - static struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "IB700 WDT", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_KEEPALIVE: - ibwdt_ping(); - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_margin, p)) - return -EFAULT; - if (ibwdt_set_heartbeat(new_margin)) - return -EINVAL; - ibwdt_ping(); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(wd_times[wd_margin], p); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - ibwdt_disable(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - ibwdt_ping(); - retval = 0; - } - - return retval; - } - - default: - return -ENOTTY; - } - return 0; -} - -static int -ibwdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &ibwdt_is_open)) { - return -EBUSY; - } - if (nowayout) - __module_get(THIS_MODULE); - - /* Activate */ - ibwdt_ping(); - return nonseekable_open(inode, file); -} - -static int -ibwdt_close(struct inode *inode, struct file *file) -{ - if (expect_close == 42) { - ibwdt_disable(); - } else { - printk(KERN_CRIT PFX "WDT device closed unexpectedly. WDT will not stop!\n"); - ibwdt_ping(); - } - clear_bit(0, &ibwdt_is_open); - expect_close = 0; - return 0; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations ibwdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = ibwdt_write, - .ioctl = ibwdt_ioctl, - .open = ibwdt_open, - .release = ibwdt_close, -}; - -static struct miscdevice ibwdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &ibwdt_fops, -}; - -/* - * Init & exit routines - */ - -static int __devinit ibwdt_probe(struct platform_device *dev) -{ - int res; - - spin_lock_init(&ibwdt_lock); - -#if WDT_START != WDT_STOP - if (!request_region(WDT_STOP, 1, "IB700 WDT")) { - printk (KERN_ERR PFX "STOP method I/O %X is not available.\n", WDT_STOP); - res = -EIO; - goto out_nostopreg; - } -#endif - - if (!request_region(WDT_START, 1, "IB700 WDT")) { - printk (KERN_ERR PFX "START method I/O %X is not available.\n", WDT_START); - res = -EIO; - goto out_nostartreg; - } - - res = misc_register(&ibwdt_miscdev); - if (res) { - printk (KERN_ERR PFX "failed to register misc device\n"); - goto out_nomisc; - } - return 0; - -out_nomisc: - release_region(WDT_START, 1); -out_nostartreg: -#if WDT_START != WDT_STOP - release_region(WDT_STOP, 1); -#endif -out_nostopreg: - return res; -} - -static int __devexit ibwdt_remove(struct platform_device *dev) -{ - misc_deregister(&ibwdt_miscdev); - release_region(WDT_START,1); -#if WDT_START != WDT_STOP - release_region(WDT_STOP,1); -#endif - return 0; -} - -static void ibwdt_shutdown(struct platform_device *dev) -{ - /* Turn the WDT off if we have a soft shutdown */ - ibwdt_disable(); -} - -static struct platform_driver ibwdt_driver = { - .probe = ibwdt_probe, - .remove = __devexit_p(ibwdt_remove), - .shutdown = ibwdt_shutdown, - .driver = { - .owner = THIS_MODULE, - .name = DRV_NAME, - }, -}; - -static int __init ibwdt_init(void) -{ - int err; - - printk(KERN_INFO PFX "WDT driver for IB700 single board computer initialising.\n"); - - err = platform_driver_register(&ibwdt_driver); - if (err) - return err; - - ibwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0); - if (IS_ERR(ibwdt_platform_device)) { - err = PTR_ERR(ibwdt_platform_device); - goto unreg_platform_driver; - } - - return 0; - -unreg_platform_driver: - platform_driver_unregister(&ibwdt_driver); - return err; -} - -static void __exit ibwdt_exit(void) -{ - platform_device_unregister(ibwdt_platform_device); - platform_driver_unregister(&ibwdt_driver); - printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); -} - -module_init(ibwdt_init); -module_exit(ibwdt_exit); - -MODULE_AUTHOR("Charles Howes <chowes@vsol.net>"); -MODULE_DESCRIPTION("IB700 SBC watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - -/* end of ib700wdt.c */ |
