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Diffstat (limited to 'drivers/char/watchdog/scx200_wdt.c')
-rw-r--r--drivers/char/watchdog/scx200_wdt.c269
1 files changed, 0 insertions, 269 deletions
diff --git a/drivers/char/watchdog/scx200_wdt.c b/drivers/char/watchdog/scx200_wdt.c
deleted file mode 100644
index d4fd0fa2f17..00000000000
--- a/drivers/char/watchdog/scx200_wdt.c
+++ /dev/null
@@ -1,269 +0,0 @@
-/* drivers/char/watchdog/scx200_wdt.c
-
- National Semiconductor SCx200 Watchdog support
-
- Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
-
- Some code taken from:
- National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver
- (c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.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.
-
- The author(s) of this software shall not be held liable for damages
- of any nature resulting due to the use of this software. This
- software is provided AS-IS with no warranties. */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/init.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/fs.h>
-#include <linux/ioport.h>
-#include <linux/scx200.h>
-
-#include <asm/uaccess.h>
-#include <asm/io.h>
-
-#define NAME "scx200_wdt"
-
-MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
-MODULE_DESCRIPTION("NatSemi SCx200 Watchdog Driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
-
-static int margin = 60; /* in seconds */
-module_param(margin, int, 0);
-MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
-
-static int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
-
-static u16 wdto_restart;
-static struct semaphore open_semaphore;
-static char expect_close;
-
-/* Bits of the WDCNFG register */
-#define W_ENABLE 0x00fa /* Enable watchdog */
-#define W_DISABLE 0x0000 /* Disable watchdog */
-
-/* The scaling factor for the timer, this depends on the value of W_ENABLE */
-#define W_SCALE (32768/1024)
-
-static void scx200_wdt_ping(void)
-{
- outw(wdto_restart, scx200_cb_base + SCx200_WDT_WDTO);
-}
-
-static void scx200_wdt_update_margin(void)
-{
- printk(KERN_INFO NAME ": timer margin %d seconds\n", margin);
- wdto_restart = margin * W_SCALE;
-}
-
-static void scx200_wdt_enable(void)
-{
- printk(KERN_DEBUG NAME ": enabling watchdog timer, wdto_restart = %d\n",
- wdto_restart);
-
- outw(0, scx200_cb_base + SCx200_WDT_WDTO);
- outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
- outw(W_ENABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
-
- scx200_wdt_ping();
-}
-
-static void scx200_wdt_disable(void)
-{
- printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
-
- outw(0, scx200_cb_base + SCx200_WDT_WDTO);
- outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
- outw(W_DISABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
-}
-
-static int scx200_wdt_open(struct inode *inode, struct file *file)
-{
- /* only allow one at a time */
- if (down_trylock(&open_semaphore))
- return -EBUSY;
- scx200_wdt_enable();
-
- return nonseekable_open(inode, file);
-}
-
-static int scx200_wdt_release(struct inode *inode, struct file *file)
-{
- if (expect_close != 42) {
- printk(KERN_WARNING NAME ": watchdog device closed unexpectedly, will not disable the watchdog timer\n");
- } else if (!nowayout) {
- scx200_wdt_disable();
- }
- expect_close = 0;
- up(&open_semaphore);
-
- return 0;
-}
-
-static int scx200_wdt_notify_sys(struct notifier_block *this,
- unsigned long code, void *unused)
-{
- if (code == SYS_HALT || code == SYS_POWER_OFF)
- if (!nowayout)
- scx200_wdt_disable();
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block scx200_wdt_notifier =
-{
- .notifier_call = scx200_wdt_notify_sys,
-};
-
-static ssize_t scx200_wdt_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- /* check for a magic close character */
- if (len)
- {
- size_t i;
-
- scx200_wdt_ping();
-
- expect_close = 0;
- for (i = 0; i < len; ++i) {
- char c;
- if (get_user(c, data+i))
- return -EFAULT;
- if (c == 'V')
- expect_close = 42;
- }
-
- return len;
- }
-
- return 0;
-}
-
-static int scx200_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static struct watchdog_info ident = {
- .identity = "NatSemi SCx200 Watchdog",
- .firmware_version = 1,
- .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING),
- };
- int new_margin;
-
- switch (cmd) {
- default:
- return -ENOTTY;
- case WDIOC_GETSUPPORT:
- if(copy_to_user(argp, &ident, sizeof(ident)))
- return -EFAULT;
- return 0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- if (put_user(0, p))
- return -EFAULT;
- return 0;
- case WDIOC_KEEPALIVE:
- scx200_wdt_ping();
- return 0;
- case WDIOC_SETTIMEOUT:
- if (get_user(new_margin, p))
- return -EFAULT;
- if (new_margin < 1)
- return -EINVAL;
- margin = new_margin;
- scx200_wdt_update_margin();
- scx200_wdt_ping();
- case WDIOC_GETTIMEOUT:
- if (put_user(margin, p))
- return -EFAULT;
- return 0;
- }
-}
-
-static const struct file_operations scx200_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = scx200_wdt_write,
- .ioctl = scx200_wdt_ioctl,
- .open = scx200_wdt_open,
- .release = scx200_wdt_release,
-};
-
-static struct miscdevice scx200_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &scx200_wdt_fops,
-};
-
-static int __init scx200_wdt_init(void)
-{
- int r;
-
- printk(KERN_DEBUG NAME ": NatSemi SCx200 Watchdog Driver\n");
-
- /* check that we have found the configuration block */
- if (!scx200_cb_present())
- return -ENODEV;
-
- if (!request_region(scx200_cb_base + SCx200_WDT_OFFSET,
- SCx200_WDT_SIZE,
- "NatSemi SCx200 Watchdog")) {
- printk(KERN_WARNING NAME ": watchdog I/O region busy\n");
- return -EBUSY;
- }
-
- scx200_wdt_update_margin();
- scx200_wdt_disable();
-
- sema_init(&open_semaphore, 1);
-
- r = misc_register(&scx200_wdt_miscdev);
- if (r) {
- release_region(scx200_cb_base + SCx200_WDT_OFFSET,
- SCx200_WDT_SIZE);
- return r;
- }
-
- r = register_reboot_notifier(&scx200_wdt_notifier);
- if (r) {
- printk(KERN_ERR NAME ": unable to register reboot notifier");
- misc_deregister(&scx200_wdt_miscdev);
- release_region(scx200_cb_base + SCx200_WDT_OFFSET,
- SCx200_WDT_SIZE);
- return r;
- }
-
- return 0;
-}
-
-static void __exit scx200_wdt_cleanup(void)
-{
- unregister_reboot_notifier(&scx200_wdt_notifier);
- misc_deregister(&scx200_wdt_miscdev);
- release_region(scx200_cb_base + SCx200_WDT_OFFSET,
- SCx200_WDT_SIZE);
-}
-
-module_init(scx200_wdt_init);
-module_exit(scx200_wdt_cleanup);
-
-/*
- Local variables:
- compile-command: "make -k -C ../.. SUBDIRS=drivers/char modules"
- c-basic-offset: 8
- End:
-*/
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