summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/lpc_sch.c
blob: ea3f52c07ef7fd3436cee6a078f011961bdb92eb (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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/*
 *  lpc_sch.c - LPC interface for Intel Poulsbo SCH
 *
 *  LPC bridge function of the Intel SCH contains many other
 *  functional units, such as Interrupt controllers, Timers,
 *  Power Management, System Management, GPIO, RTC, and LPC
 *  Configuration Registers.
 *
 *  Copyright (c) 2010 CompuLab Ltd
 *  Author: Denis Turischev <denis@compulab.co.il>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License 2 as published
 *  by the Free Software Foundation.
 *
 *  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; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/mfd/core.h>

#define SMBASE		0x40
#define SMBUS_IO_SIZE	64

#define GPIOBASE	0x44
#define GPIO_IO_SIZE	64

static struct resource smbus_sch_resource = {
		.flags = IORESOURCE_IO,
};


static struct resource gpio_sch_resource = {
		.flags = IORESOURCE_IO,
};

static struct mfd_cell lpc_sch_cells[] = {
	{
		.name = "isch_smbus",
		.num_resources = 1,
		.resources = &smbus_sch_resource,
	},
	{
		.name = "sch_gpio",
		.num_resources = 1,
		.resources = &gpio_sch_resource,
	},
};

static struct pci_device_id lpc_sch_ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, lpc_sch_ids);

static int __devinit lpc_sch_probe(struct pci_dev *dev,
				const struct pci_device_id *id)
{
	unsigned int base_addr_cfg;
	unsigned short base_addr;
	int i;

	pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
	if (!(base_addr_cfg & (1 << 31))) {
		dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
		return -ENODEV;
	}
	base_addr = (unsigned short)base_addr_cfg;
	if (base_addr == 0) {
		dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
		return -ENODEV;
	}

	smbus_sch_resource.start = base_addr;
	smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;

	pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
	if (!(base_addr_cfg & (1 << 31))) {
		dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
		return -ENODEV;
	}
	base_addr = (unsigned short)base_addr_cfg;
	if (base_addr == 0) {
		dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
		return -ENODEV;
	}

	gpio_sch_resource.start = base_addr;
	gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;

	for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
		lpc_sch_cells[i].id = id->device;

	return mfd_add_devices(&dev->dev, 0,
			lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
}

static void __devexit lpc_sch_remove(struct pci_dev *dev)
{
	mfd_remove_devices(&dev->dev);
}

static struct pci_driver lpc_sch_driver = {
	.name		= "lpc_sch",
	.id_table	= lpc_sch_ids,
	.probe		= lpc_sch_probe,
	.remove		= __devexit_p(lpc_sch_remove),
};

static int __init lpc_sch_init(void)
{
	return pci_register_driver(&lpc_sch_driver);
}

static void __exit lpc_sch_exit(void)
{
	pci_unregister_driver(&lpc_sch_driver);
}

module_init(lpc_sch_init);
module_exit(lpc_sch_exit);

MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud