404 lines
8.7 KiB
C
404 lines
8.7 KiB
C
/*
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* w83697ug/uf WDT driver
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*
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* (c) Copyright 2008 Flemming Fransen <ff@nrvissing.net>
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* reused original code to support w83697ug/uf.
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*
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* Based on w83627hf_wdt.c which is based on advantechwdt.c
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* which is based on wdt.c.
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* Original copyright messages:
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*
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* (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
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* added support for W83627THF.
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*
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* (c) Copyright 2003 Pádraig Brady <P@draigBrady.com>
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*
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* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
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*
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* (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
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* http://www.redhat.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
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* warranty for any of this software. This material is provided
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* "AS-IS" and at no charge.
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*
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* (c) Copyright 1995 Alan Cox <alan@redhat.com>
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/fs.h>
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#include <linux/ioport.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <asm/system.h>
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#define WATCHDOG_NAME "w83697ug/uf WDT"
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#define PFX WATCHDOG_NAME ": "
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#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
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static unsigned long wdt_is_open;
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static char expect_close;
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static DEFINE_SPINLOCK(io_lock);
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static int wdt_io = 0x2e;
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module_param(wdt_io, int, 0);
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MODULE_PARM_DESC(wdt_io, "w83697ug/uf WDT io port (default 0x2e)");
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static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. 1<= timeout <=255 (default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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* Kernel methods.
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*/
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#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
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#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
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(same as EFER) */
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#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
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static int w83697ug_select_wd_register(void)
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{
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unsigned char c;
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unsigned char version;
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outb_p(0x87, WDT_EFER); /* Enter extended function mode */
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outb_p(0x87, WDT_EFER); /* Again according to manual */
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outb(0x20, WDT_EFER); /* check chip version */
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version = inb(WDT_EFDR);
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if (version == 0x68) { /* W83697UG */
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printk(KERN_INFO PFX "Watchdog chip version 0x%02x = "
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"W83697UG/UF found at 0x%04x\n", version, wdt_io);
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outb_p(0x2b, WDT_EFER);
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c = inb_p(WDT_EFDR); /* select WDT0 */
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c &= ~0x04;
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outb_p(0x2b, WDT_EFER);
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outb_p(c, WDT_EFDR); /* set pin118 to WDT0 */
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} else {
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printk(KERN_ERR PFX "No W83697UG/UF could be found\n");
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return -ENODEV;
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}
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outb_p(0x07, WDT_EFER); /* point to logical device number reg */
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outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
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outb_p(0x30, WDT_EFER); /* select CR30 */
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c = inb_p(WDT_EFDR);
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outb_p(c || 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
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return 0;
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}
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static void w83697ug_unselect_wd_register(void)
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{
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outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
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}
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static int w83697ug_init(void)
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{
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int ret;
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unsigned char t;
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ret = w83697ug_select_wd_register();
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if (ret != 0)
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return ret;
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outb_p(0xF6, WDT_EFER); /* Select CRF6 */
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t = inb_p(WDT_EFDR); /* read CRF6 */
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if (t != 0) {
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printk(KERN_INFO PFX "Watchdog already running."
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" Resetting timeout to %d sec\n", timeout);
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outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */
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}
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outb_p(0xF5, WDT_EFER); /* Select CRF5 */
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t = inb_p(WDT_EFDR); /* read CRF5 */
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t &= ~0x0C; /* set second mode &
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disable keyboard turning off watchdog */
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outb_p(t, WDT_EFDR); /* Write back to CRF5 */
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w83697ug_unselect_wd_register();
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return 0;
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}
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static void wdt_ctrl(int timeout)
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{
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spin_lock(&io_lock);
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if (w83697ug_select_wd_register() < 0) {
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spin_unlock(&io_lock);
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return;
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}
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outb_p(0xF4, WDT_EFER); /* Select CRF4 */
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outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */
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w83697ug_unselect_wd_register();
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spin_unlock(&io_lock);
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}
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static int wdt_ping(void)
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{
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wdt_ctrl(timeout);
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return 0;
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}
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static int wdt_disable(void)
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{
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wdt_ctrl(0);
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return 0;
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}
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static int wdt_set_heartbeat(int t)
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{
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if (t < 1 || t > 255)
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return -EINVAL;
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timeout = t;
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return 0;
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}
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static ssize_t wdt_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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if (count) {
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if (!nowayout) {
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size_t i;
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expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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wdt_ping();
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}
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return count;
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}
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static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int new_timeout;
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static const struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING |
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WDIOF_SETTIMEOUT |
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WDIOF_MAGICCLOSE,
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.firmware_version = 1,
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.identity = "W83697UG WDT",
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident)))
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return -EFAULT;
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break;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_SETOPTIONS:
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{
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int options, retval = -EINVAL;
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if (get_user(options, p))
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return -EFAULT;
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if (options & WDIOS_DISABLECARD) {
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wdt_disable();
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retval = 0;
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}
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if (options & WDIOS_ENABLECARD) {
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wdt_ping();
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retval = 0;
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}
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return retval;
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}
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case WDIOC_KEEPALIVE:
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wdt_ping();
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break;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_timeout, p))
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return -EFAULT;
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if (wdt_set_heartbeat(new_timeout))
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return -EINVAL;
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wdt_ping();
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/* Fall */
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case WDIOC_GETTIMEOUT:
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return put_user(timeout, p);
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default:
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return -ENOTTY;
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}
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return 0;
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}
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static int wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(0, &wdt_is_open))
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return -EBUSY;
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/*
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* Activate
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*/
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wdt_ping();
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return nonseekable_open(inode, file);
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}
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static int wdt_close(struct inode *inode, struct file *file)
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{
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if (expect_close == 42)
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wdt_disable();
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else {
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printk(KERN_CRIT PFX
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"Unexpected close, not stopping watchdog!\n");
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wdt_ping();
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}
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expect_close = 0;
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clear_bit(0, &wdt_is_open);
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return 0;
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}
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/*
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* Notifier for system down
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*/
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static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
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void *unused)
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{
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if (code == SYS_DOWN || code == SYS_HALT)
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wdt_disable(); /* Turn the WDT off */
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return NOTIFY_DONE;
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}
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/*
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* Kernel Interfaces
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*/
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static const struct file_operations wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = wdt_write,
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.unlocked_ioctl = wdt_ioctl,
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.open = wdt_open,
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.release = wdt_close,
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};
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static struct miscdevice wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &wdt_fops,
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};
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/*
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* The WDT needs to learn about soft shutdowns in order to
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* turn the timebomb registers off.
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*/
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static struct notifier_block wdt_notifier = {
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.notifier_call = wdt_notify_sys,
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};
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static int __init wdt_init(void)
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{
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int ret;
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printk(KERN_INFO "WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising.\n");
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if (wdt_set_heartbeat(timeout)) {
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wdt_set_heartbeat(WATCHDOG_TIMEOUT);
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printk(KERN_INFO PFX
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"timeout value must be 1<=timeout<=255, using %d\n",
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WATCHDOG_TIMEOUT);
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}
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if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
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printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
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wdt_io);
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ret = -EIO;
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goto out;
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}
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ret = w83697ug_init();
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if (ret != 0)
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goto unreg_regions;
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ret = register_reboot_notifier(&wdt_notifier);
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if (ret != 0) {
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printk(KERN_ERR PFX
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"cannot register reboot notifier (err=%d)\n", ret);
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goto unreg_regions;
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}
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ret = misc_register(&wdt_miscdev);
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if (ret != 0) {
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printk(KERN_ERR PFX
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"cannot register miscdev on minor=%d (err=%d)\n",
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WATCHDOG_MINOR, ret);
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goto unreg_reboot;
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}
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printk(KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
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timeout, nowayout);
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out:
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return ret;
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unreg_reboot:
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unregister_reboot_notifier(&wdt_notifier);
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unreg_regions:
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release_region(wdt_io, 1);
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goto out;
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}
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static void __exit wdt_exit(void)
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{
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misc_deregister(&wdt_miscdev);
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unregister_reboot_notifier(&wdt_notifier);
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release_region(wdt_io, 1);
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}
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module_init(wdt_init);
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module_exit(wdt_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Flemming Frandsen <ff@nrvissing.net>");
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MODULE_DESCRIPTION("w83697ug/uf WDT driver");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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