2 * This file is part of the coreboot project.
4 * Copyright (C) 2007 Silicon Integrated Systems Corp. (SiS)
5 * Written by Morgan Tsai <my_tsai@sis.com> for SiS.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
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
23 * Turn off machine check triggers when reading
24 * pci space where there are no devices.
25 * This is necessary when scaning the bus for
26 * devices which is done by the kernel
28 * written in 2003 by Eric Biederman
30 * - Athlon64 workarounds by Stefan Reinauer
31 * - "reset once" logic by Yinghai Lu
34 #include <console/console.h>
35 #include <device/device.h>
36 #include <device/pci.h>
37 #include <device/pci_ids.h>
38 #include <device/pci_ops.h>
39 #include <pc80/mc146818rtc.h>
41 #include <cpu/amd/model_fxx_rev.h>
45 * @brief Read resources for AGP aperture
49 * There is only one AGP aperture resource needed. The resoruce is added to
50 * the northbridge of BSP.
52 * The same trick can be used to augment legacy VGA resources which can
53 * be detect by generic pci reousrce allocator for VGA devices.
54 * BAD: it is more tricky than I think, the resource allocation code is
55 * implemented in a way to NOT DOING legacy VGA resource allcation on
60 typedef struct msr_struct
66 static inline msr_t rdmsr(unsigned index)
74 static void sis761_read_resources(device_t dev)
76 /* Read the generic PCI resources */
77 printk(BIOS_DEBUG, "sis761_read_resources ------->\n");
78 pci_dev_read_resources(dev);
80 /* If we are not the first processor don't allocate the gart apeture */
81 if (dev->path.pci.devfn != PCI_DEVFN(0x0, 0)) {
82 printk(BIOS_DEBUG, "sis761_not_the_first_processor !!!\n");
86 printk(BIOS_DEBUG, "sis761_read_resources <-------\n");
91 static void sis761_set_resources(device_t dev)
93 printk(BIOS_DEBUG, "sis761_set_resources ------->\n");
95 /* Set the generic PCI resources */
96 pci_dev_set_resources(dev);
97 printk(BIOS_DEBUG, "sis761_set_resources <-------\n");
100 static void sis761_init(struct device *dev)
107 printk(BIOS_DEBUG, "sis761_init: ---------->\n");
109 msr = rdmsr(0xC001001A);
110 pci_write_config16(dev, 0x8E, msr.lo >> 16); // Topbound
111 pci_write_config8(dev, 0x7F, 0x08); // ACPI Base
112 outb(inb(0x856) | 0x40, 0x856); // Auto-Reset Function
114 printk(BIOS_DEBUG, "sis761_init: <----------\n");
118 static struct device_operations sis761_ops = {
119 .read_resources = sis761_read_resources,
120 .set_resources = sis761_set_resources,
121 .enable_resources = pci_dev_enable_resources,
127 static const struct pci_driver sis761_driver __pci_driver = {
129 .vendor = PCI_VENDOR_ID_SIS,
130 .device = PCI_DEVICE_ID_SIS_SIS761,