| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> |
| * Copyright (C) 2011 Alexandru Gagniuc <mr.nuke.me@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; 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 |
| * 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 <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); |
| #if CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T800_OLD |
| writeback(dev, 0x42, 0x80); |
| writeback(dev, 0x44, 0x35); |
| #else |
| writeback(dev, 0x44, 0x31); /* K8M890 should have 0x35 datasheet |
| * says it is reserved |
| */ |
| #endif |
| 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 ) |
| */ |
| |
| #if CONFIG_SOUTHBRIDGE_VIA_SUBTYPE_K8T800_OLD |
| writeback(dev, 0x3e, 0x0a); |
| #else |
| writeback(dev, 0x3e, 0x16); |
| #endif |
| dump_south(dev); |
| |
| /* 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, |
| }; |