2 * This file is part of the coreboot project.
4 * Copyright (C) 2008-2009 coresystems GmbH
5 * Copyright (C) 2011 Google Inc.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; version 2 of
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <console/console.h>
24 #include <device/device.h>
25 #include <device/pci.h>
29 // Disable PCH Watchdog timer at SB_RCBA+0x3410
31 // Mmio32((MmPci32(0, 0, 0x1F, 0, 0xF0) & ~BIT0), 0x3410) |= 0x20;
33 void watchdog_off(void)
36 unsigned long value, base;
38 /* Turn off the ICH7 watchdog. */
39 dev = dev_find_slot(0, PCI_DEVFN(0x1f, 0));
41 /* Enable I/O space. */
42 value = pci_read_config16(dev, 0x04);
44 pci_write_config16(dev, 0x04, value);
47 base = (pci_read_config32(dev, 0x40) & 0x0fffe) + 0x60;
49 /* Disable the watchdog timer. */
50 value = inw(base + 0x08);
52 outw(value, base + 0x08);
54 /* Clear TCO timeout status. */
55 outw(0x0008, base + 0x04);
56 outw(0x0002, base + 0x06);
58 printk(BIOS_DEBUG, "PCH watchdog disabled\n");