src/southbridge/intel/i82801bx/i82801bx_watchdog.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2006 John Dufresne <jon.dufresne@gmail.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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <console/console.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/pci.h>
#include <watchdog.h>

/* TODO: I'm fairly sure the same functionality is provided elsewhere. */

void watchdog_off(void)
{
	device_t dev;
	unsigned long value, base;

	/* Turn off the ICH5 watchdog. */
	dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));

	/* Enable I/O space. */
	value = pci_read_config16(dev, 0x04);
	value |= (1 << 10);
	pci_write_config16(dev, 0x04, value);

	/* Get TCO base. */
	base = (pci_read_config32(dev, 0x40) & 0x0fffe) + 0x60;

	/* Disable the watchdog timer. */
	value = inw(base + 0x08);
	value |= 1 << 11;
	outw(value, base + 0x08);

	/* Clear TCO timeout status. */
	outw(0x0008, base + 0x04);
	outw(0x0002, base + 0x06);

	printk(BIOS_DEBUG, "ICH Watchdog disabled\n");
}