blob: 2da31f4be7c84e58e6bd659fde8d62136d73fa3b [file] [log] [blame]
* This file is part of the coreboot project.
* Copyright (C) 2007 Rudolf Marek <>
* Copyright (C) 2011 Alexandru Gagniuc <>
* 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; version 2 of the License.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* 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 <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <console/console.h>
#include "k8x8xx.h"
static void bridge_enable(struct device *dev)
u8 tmp;
print_debug("B188 device dump\n");
/* VIA recommends this, sorry no known info. */
writeback(dev, 0x40, 0x91);
writeback(dev, 0x41, 0x40);
writeback(dev, 0x43, 0x44);
writeback(dev, 0x42, 0x80);
writeback(dev, 0x44, 0x35);
writeback(dev, 0x44, 0x31); /* K8M890 should have 0x35 datasheet
* says it is reserved
writeback(dev, 0x45, 0x3a);
writeback(dev, 0x46, 0x88); /* PCI ID lo */
writeback(dev, 0x47, 0xb1); /* PCI ID hi */
/* Bridge control, K8M890 bit 3 should be set to enable VGA on AGP
* (Forward VGA compatible memory and I/O cycles )
writeback(dev, 0x3e, 0x0a);
writeback(dev, 0x3e, 0x16);
/* disable I/O and memory decode, or it freezes PCI bus during BAR sizing */
tmp = pci_read_config8(dev, PCI_COMMAND);
tmp &= ~0x3;
pci_write_config8(dev, PCI_COMMAND, tmp);
static const struct device_operations bridge_ops = {
.read_resources = pci_bus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.enable = bridge_enable,
.scan_bus = pci_scan_bridge,
.reset_bus = pci_bus_reset,
.ops_pci = 0,
* K8T890 and K8T800 both use device B188 as the bridge, so no need to
* add a separate driver
static const struct pci_driver northbridge_driver_890 __pci_driver = {
.ops = &bridge_ops,
.vendor = PCI_VENDOR_ID_VIA,
.device = PCI_DEVICE_ID_VIA_K8T890CE_BR,