summaryrefslogtreecommitdiff
path: root/src/southbridge/intel/i82801ix/smbus.c
blob: 303aae64f2a124889f3049289f1ef679e692b7c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008-2009 coresystems GmbH
 *
 * 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.
 */

#include <device/device.h>
#include <device/path.h>
#include <device/smbus.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <arch/io.h>
#include <southbridge/intel/common/smbus.h>
#include "i82801ix.h"

static void pch_smbus_init(struct device *dev)
{
	u16 reg16;

	/* Enable clock gating */
	reg16 = pci_read_config16(dev, 0x80);
	reg16 &= ~((1 << 8)|(1 << 10)|(1 << 12)|(1 << 14));
	pci_write_config16(dev, 0x80, reg16);
}

static int lsmbus_read_byte(struct device *dev, u8 address)
{
	u16 device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, 0x20);

	return do_smbus_read_byte(res->base, device, address);
}

static int lsmbus_write_byte(struct device *dev, u8 address, u8 val)
{
	u16 device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, 0x20);

	return do_smbus_write_byte(res->base, device, address, val);
}

static struct smbus_bus_operations lops_smbus_bus = {
	.read_byte	= lsmbus_read_byte,
	.write_byte	= lsmbus_write_byte,
};

static void smbus_set_subsystem(struct device *dev, unsigned vendor,
				unsigned device)
{
	if (!vendor || !device) {
		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
				pci_read_config32(dev, PCI_VENDOR_ID));
	} else {
		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
				((device & 0xffff) << 16) | (vendor & 0xffff));
	}
}

static struct pci_operations smbus_pci_ops = {
	.set_subsystem    = smbus_set_subsystem,
};

static void smbus_read_resources(struct device *dev)
{
	struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4);
	res->base = SMBUS_IO_BASE;
	res->size = 32;
	res->limit = res->base + res->size - 1;
	res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE |
		     IORESOURCE_STORED | IORESOURCE_ASSIGNED;

	/* Also add MMIO resource */
	res = pci_get_resource(dev, PCI_BASE_ADDRESS_0);
}

static struct device_operations smbus_ops = {
	.read_resources		= smbus_read_resources,
	.set_resources		= pci_dev_set_resources,
	.enable_resources	= pci_dev_enable_resources,
	.scan_bus		= scan_smbus,
	.init			= pch_smbus_init,
	.ops_smbus_bus		= &lops_smbus_bus,
	.ops_pci		= &smbus_pci_ops,
};

static const unsigned short pci_device_ids[] = { 0x2930, 0 };

static const struct pci_driver pch_smbus __pci_driver = {
	.ops	 = &smbus_ops,
	.vendor	 = PCI_VENDOR_ID_INTEL,
	.devices = pci_device_ids,
};