2 * This file is part of the coreboot project.
4 * Copyright (C) 2008-2009 coresystems GmbH
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; version 2 of
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include <console/console.h>
22 #include <device/device.h>
23 #include <device/path.h>
24 #include <device/smbus.h>
25 #include <device/pci.h>
26 #include <device/pci_ids.h>
27 #include <device/pci_ops.h>
33 static void smbus_init(struct device *dev)
37 smb_base = pci_read_config32(dev, SMB_BASE);
38 printk(BIOS_DEBUG, "Initializing SMBus device:\n");
39 printk(BIOS_DEBUG, " Old SMBUS Base Address: 0x%04x\n", smb_base);
40 pci_write_config32(dev, SMB_BASE, 0x00000401);
41 smb_base = pci_read_config32(dev, SMB_BASE);
42 printk(BIOS_DEBUG, " New SMBUS Base Address: 0x%04x\n", smb_base);
45 static int lsmbus_read_byte(device_t dev, u8 address)
51 device = dev->path.i2c.device;
52 pbus = get_pbus_smbus(dev);
53 res = find_resource(pbus->dev, 0x20);
55 return do_smbus_read_byte(res->base, device, address);
58 static struct smbus_bus_operations lops_smbus_bus = {
59 .read_byte = lsmbus_read_byte,
62 static void smbus_set_subsystem(device_t dev, unsigned vendor, unsigned device)
64 if (!vendor || !device) {
65 pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
66 pci_read_config32(dev, PCI_VENDOR_ID));
68 pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
69 ((device & 0xffff) << 16) | (vendor & 0xffff));
73 static struct pci_operations smbus_pci_ops = {
74 .set_subsystem = smbus_set_subsystem,
77 static struct device_operations smbus_ops = {
78 .read_resources = pci_dev_read_resources,
79 .set_resources = pci_dev_set_resources,
80 .enable_resources = pci_dev_enable_resources,
82 .scan_bus = scan_static_bus,
83 .enable = i82801gx_enable,
84 .ops_smbus_bus = &lops_smbus_bus,
85 .ops_pci = &smbus_pci_ops,
88 /* 82801GB/GR/GDH/GBM/GHM/GU (ICH7/ICH7R/ICH7DH/ICH7-M/ICH7-M DH/ICH7-U) */
89 static const struct pci_driver i82801gx_smbus __pci_driver = {
91 .vendor = PCI_VENDOR_ID_INTEL,