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path: root/drivers/char/watchdog/ib700wdt.c
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Diffstat (limited to 'drivers/char/watchdog/ib700wdt.c')
-rw-r--r--drivers/char/watchdog/ib700wdt.c408
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 c3a60f52ccb..00000000000
--- 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-19 00:14:28 +0000