diff options
Diffstat (limited to 'drivers/char/watchdog/sbc8360.c')
| -rw-r--r-- | drivers/char/watchdog/sbc8360.c | 413 |
1 files changed, 0 insertions, 413 deletions
diff --git a/drivers/char/watchdog/sbc8360.c b/drivers/char/watchdog/sbc8360.c deleted file mode 100644 index 285d8528953..00000000000 --- a/drivers/char/watchdog/sbc8360.c +++ /dev/null @@ -1,413 +0,0 @@ -/* - * SBC8360 Watchdog driver - * - * (c) Copyright 2005 Webcon, Inc. - * - * Based on ib700wdt.c, which is based on advantechwdt.c which is based - * on acquirewdt.c which is based on wdt.c. - * - * (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/delay.h> -#include <linux/notifier.h> -#include <linux/fs.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/moduleparam.h> - -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/system.h> - -static unsigned long sbc8360_is_open; -static spinlock_t sbc8360_lock; -static char expect_close; - -#define PFX "sbc8360: " - -/* - * - * Watchdog Timer Configuration - * - * The function of the watchdog timer is to reset the system automatically - * and is defined at I/O port 0120H and 0121H. To enable the watchdog timer - * and allow the system to reset, write appropriate values from the table - * below to I/O port 0120H and 0121H. To disable the timer, write a zero - * value to I/O port 0121H for the system to stop the watchdog function. - * - * The following describes how the timer should be programmed (according to - * the vendor documentation) - * - * Enabling Watchdog: - * MOV AX,000AH (enable, phase I) - * MOV DX,0120H - * OUT DX,AX - * MOV AX,000BH (enable, phase II) - * MOV DX,0120H - * OUT DX,AX - * MOV AX,000nH (set multiplier n, from 1-4) - * MOV DX,0120H - * OUT DX,AX - * MOV AX,000mH (set base timer m, from 0-F) - * MOV DX,0121H - * OUT DX,AX - * - * Reset timer: - * MOV AX,000mH (same as set base timer, above) - * MOV DX,0121H - * OUT DX,AX - * - * Disabling Watchdog: - * MOV AX,0000H (a zero value) - * MOV DX,0120H - * OUT DX,AX - * - * Watchdog timeout configuration values: - * N - * M | 1 2 3 4 - * --|---------------------------------- - * 0 | 0.5s 5s 50s 100s - * 1 | 1s 10s 100s 200s - * 2 | 1.5s 15s 150s 300s - * 3 | 2s 20s 200s 400s - * 4 | 2.5s 25s 250s 500s - * 5 | 3s 30s 300s 600s - * 6 | 3.5s 35s 350s 700s - * 7 | 4s 40s 400s 800s - * 8 | 4.5s 45s 450s 900s - * 9 | 5s 50s 500s 1000s - * A | 5.5s 55s 550s 1100s - * B | 6s 60s 600s 1200s - * C | 6.5s 65s 650s 1300s - * D | 7s 70s 700s 1400s - * E | 7.5s 75s 750s 1500s - * F | 8s 80s 800s 1600s - * - * Another way to say the same things is: - * For N=1, Timeout = (M+1) * 0.5s - * For N=2, Timeout = (M+1) * 5s - * For N=3, Timeout = (M+1) * 50s - * For N=4, Timeout = (M+1) * 100s - * - */ - -static int wd_times[64][2] = { - {0, 1}, /* 0 = 0.5s */ - {1, 1}, /* 1 = 1s */ - {2, 1}, /* 2 = 1.5s */ - {3, 1}, /* 3 = 2s */ - {4, 1}, /* 4 = 2.5s */ - {5, 1}, /* 5 = 3s */ - {6, 1}, /* 6 = 3.5s */ - {7, 1}, /* 7 = 4s */ - {8, 1}, /* 8 = 4.5s */ - {9, 1}, /* 9 = 5s */ - {0xA, 1}, /* 10 = 5.5s */ - {0xB, 1}, /* 11 = 6s */ - {0xC, 1}, /* 12 = 6.5s */ - {0xD, 1}, /* 13 = 7s */ - {0xE, 1}, /* 14 = 7.5s */ - {0xF, 1}, /* 15 = 8s */ - {0, 2}, /* 16 = 5s */ - {1, 2}, /* 17 = 10s */ - {2, 2}, /* 18 = 15s */ - {3, 2}, /* 19 = 20s */ - {4, 2}, /* 20 = 25s */ - {5, 2}, /* 21 = 30s */ - {6, 2}, /* 22 = 35s */ - {7, 2}, /* 23 = 40s */ - {8, 2}, /* 24 = 45s */ - {9, 2}, /* 25 = 50s */ - {0xA, 2}, /* 26 = 55s */ - {0xB, 2}, /* 27 = 60s */ - {0xC, 2}, /* 28 = 65s */ - {0xD, 2}, /* 29 = 70s */ - {0xE, 2}, /* 30 = 75s */ - {0xF, 2}, /* 31 = 80s */ - {0, 3}, /* 32 = 50s */ - {1, 3}, /* 33 = 100s */ - {2, 3}, /* 34 = 150s */ - {3, 3}, /* 35 = 200s */ - {4, 3}, /* 36 = 250s */ - {5, 3}, /* 37 = 300s */ - {6, 3}, /* 38 = 350s */ - {7, 3}, /* 39 = 400s */ - {8, 3}, /* 40 = 450s */ - {9, 3}, /* 41 = 500s */ - {0xA, 3}, /* 42 = 550s */ - {0xB, 3}, /* 43 = 600s */ - {0xC, 3}, /* 44 = 650s */ - {0xD, 3}, /* 45 = 700s */ - {0xE, 3}, /* 46 = 750s */ - {0xF, 3}, /* 47 = 800s */ - {0, 4}, /* 48 = 100s */ - {1, 4}, /* 49 = 200s */ - {2, 4}, /* 50 = 300s */ - {3, 4}, /* 51 = 400s */ - {4, 4}, /* 52 = 500s */ - {5, 4}, /* 53 = 600s */ - {6, 4}, /* 54 = 700s */ - {7, 4}, /* 55 = 800s */ - {8, 4}, /* 56 = 900s */ - {9, 4}, /* 57 = 1000s */ - {0xA, 4}, /* 58 = 1100s */ - {0xB, 4}, /* 59 = 1200s */ - {0xC, 4}, /* 60 = 1300s */ - {0xD, 4}, /* 61 = 1400s */ - {0xE, 4}, /* 62 = 1500s */ - {0xF, 4} /* 63 = 1600s */ -}; - -#define SBC8360_ENABLE 0x120 -#define SBC8360_BASETIME 0x121 - -static int timeout = 27; -static int wd_margin = 0xB; -static int wd_multiplier = 2; -static int nowayout = WATCHDOG_NOWAYOUT; - -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, "Index into timeout table (0-63) (default=27 (60s))"); -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, - "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -/* - * Kernel methods. - */ - -/* Activate and pre-configure watchdog */ -static void sbc8360_activate(void) -{ - /* Enable the watchdog */ - outb(0x0A, SBC8360_ENABLE); - msleep_interruptible(100); - outb(0x0B, SBC8360_ENABLE); - msleep_interruptible(100); - /* Set timeout multiplier */ - outb(wd_multiplier, SBC8360_ENABLE); - msleep_interruptible(100); - /* Nothing happens until first sbc8360_ping() */ -} - -/* Kernel pings watchdog */ -static void sbc8360_ping(void) -{ - /* Write the base timer register */ - outb(wd_margin, SBC8360_BASETIME); -} - -/* Userspace pings kernel driver, or requests clean close */ -static ssize_t sbc8360_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; - } - } - sbc8360_ping(); - } - return count; -} - -static int sbc8360_open(struct inode *inode, struct file *file) -{ - spin_lock(&sbc8360_lock); - if (test_and_set_bit(0, &sbc8360_is_open)) { - spin_unlock(&sbc8360_lock); - return -EBUSY; - } - if (nowayout) - __module_get(THIS_MODULE); - - /* Activate and ping once to start the countdown */ - spin_unlock(&sbc8360_lock); - sbc8360_activate(); - sbc8360_ping(); - return nonseekable_open(inode, file); -} - -static int sbc8360_close(struct inode *inode, struct file *file) -{ - spin_lock(&sbc8360_lock); - if (expect_close == 42) - outb(0, SBC8360_ENABLE); - else - printk(KERN_CRIT PFX - "SBC8360 device closed unexpectedly. SBC8360 will not stop!\n"); - - clear_bit(0, &sbc8360_is_open); - expect_close = 0; - spin_unlock(&sbc8360_lock); - return 0; -} - -/* - * Notifier for system down - */ - -static int sbc8360_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) { - /* Disable the SBC8360 Watchdog */ - outb(0, SBC8360_ENABLE); - } - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations sbc8360_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = sbc8360_write, - .open = sbc8360_open, - .release = sbc8360_close, -}; - -static struct miscdevice sbc8360_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &sbc8360_fops, -}; - -/* - * The SBC8360 needs to learn about soft shutdowns in order to - * turn the timebomb registers off. - */ - -static struct notifier_block sbc8360_notifier = { - .notifier_call = sbc8360_notify_sys, -}; - -static int __init sbc8360_init(void) -{ - int res; - unsigned long int mseconds = 60000; - - if (timeout < 0 || timeout > 63) { - printk(KERN_ERR PFX "Invalid timeout index (must be 0-63).\n"); - res = -EINVAL; - goto out; - } - - if (!request_region(SBC8360_ENABLE, 1, "SBC8360")) { - printk(KERN_ERR PFX "ENABLE method I/O %X is not available.\n", - SBC8360_ENABLE); - res = -EIO; - goto out; - } - if (!request_region(SBC8360_BASETIME, 1, "SBC8360")) { - printk(KERN_ERR PFX - "BASETIME method I/O %X is not available.\n", - SBC8360_BASETIME); - res = -EIO; - goto out_nobasetimereg; - } - - res = register_reboot_notifier(&sbc8360_notifier); - if (res) { - printk(KERN_ERR PFX "Failed to register reboot notifier.\n"); - goto out_noreboot; - } - - spin_lock_init(&sbc8360_lock); - res = misc_register(&sbc8360_miscdev); - if (res) { - printk(KERN_ERR PFX "failed to register misc device\n"); - goto out_nomisc; - } - - wd_margin = wd_times[timeout][0]; - wd_multiplier = wd_times[timeout][1]; - - if (wd_multiplier == 1) - mseconds = (wd_margin + 1) * 500; - else if (wd_multiplier == 2) - mseconds = (wd_margin + 1) * 5000; - else if (wd_multiplier == 3) - mseconds = (wd_margin + 1) * 50000; - else if (wd_multiplier == 4) - mseconds = (wd_margin + 1) * 100000; - - /* My kingdom for the ability to print "0.5 seconds" in the kernel! */ - printk(KERN_INFO PFX "Timeout set at %ld ms.\n", mseconds); - - return 0; - - out_nomisc: - unregister_reboot_notifier(&sbc8360_notifier); - out_noreboot: - release_region(SBC8360_BASETIME, 1); - out_nobasetimereg: - release_region(SBC8360_ENABLE, 1); - out: - return res; -} - -static void __exit sbc8360_exit(void) -{ - misc_deregister(&sbc8360_miscdev); - unregister_reboot_notifier(&sbc8360_notifier); - release_region(SBC8360_ENABLE, 1); - release_region(SBC8360_BASETIME, 1); -} - -module_init(sbc8360_init); -module_exit(sbc8360_exit); - -MODULE_AUTHOR("Ian E. Morgan <imorgan@webcon.ca>"); -MODULE_DESCRIPTION("SBC8360 watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_VERSION("1.01"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - -/* end of sbc8360.c */ |