aboutsummaryrefslogtreecommitdiff
path: root/drivers/mfd/vx855.c
blob: 757ecc63338c19a7d7d75c85e4a185459fb3d3a0 (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
/*
 * Linux multi-function-device driver (MFD) for the integrated peripherals
 * of the VIA VX855 chipset
 *
 * Copyright (C) 2009 VIA Technologies, Inc.
 * Copyright (C) 2010 One Laptop per Child
 * Author: Harald Welte <HaraldWelte@viatech.com>
 * All rights reserved.
 *
 * 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; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/mfd/core.h>

/* offset into pci config space indicating the 16bit register containing
 * the power management IO space base */
#define VX855_CFG_PMIO_OFFSET	0x88

/* ACPI I/O Space registers */
#define VX855_PMIO_ACPI		0x00
#define VX855_PMIO_ACPI_LEN	0x0b

/* Processor Power Management */
#define VX855_PMIO_PPM		0x10
#define VX855_PMIO_PPM_LEN	0x08

/* General Purpose Power Management */
#define VX855_PMIO_GPPM		0x20
#define VX855_PMIO_R_GPI	0x48
#define VX855_PMIO_R_GPO	0x4c
#define VX855_PMIO_GPPM_LEN	0x33

#define VSPIC_MMIO_SIZE	0x1000

static struct resource vx855_gpio_resources[] = {
	{
		.flags = IORESOURCE_IO,
	},
	{
		.flags = IORESOURCE_IO,
	},
};

static struct mfd_cell vx855_cells[] = {
	{
		.name = "vx855_gpio",
		.num_resources = ARRAY_SIZE(vx855_gpio_resources),
		.resources = vx855_gpio_resources,

		/* we must ignore resource conflicts, for reasons outlined in
		 * the vx855_gpio driver */
		.ignore_resource_conflicts = true,
	},
};

static int vx855_probe(struct pci_dev *pdev,
				 const struct pci_device_id *id)
{
	int ret;
	u16 gpio_io_offset;

	ret = pci_enable_device(pdev);
	if (ret)
		return -ENODEV;

	pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset);
	if (!gpio_io_offset) {
		dev_warn(&pdev->dev,
			"BIOS did not assign PMIO base offset?!?\n");
		ret = -ENODEV;
		goto out;
	}

	/* mask out the lowest seven bits, as they are always zero, but
	 * hardware returns them as 0x01 */
	gpio_io_offset &= 0xff80;

	/* As the region identified here includes many non-GPIO things, we
	 * only work with the specific registers that concern us. */
	vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI;
	vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3;
	vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO;
	vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3;

	ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells),
			NULL, 0, NULL);

	/* we always return -ENODEV here in order to enable other
	 * drivers like old, not-yet-platform_device ported i2c-viapro */
	return -ENODEV;
out:
	pci_disable_device(pdev);
	return ret;
}

static void vx855_remove(struct pci_dev *pdev)
{
	mfd_remove_devices(&pdev->dev);
	pci_disable_device(pdev);
}

static DEFINE_PCI_DEVICE_TABLE(vx855_pci_tbl) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, vx855_pci_tbl);

static struct pci_driver vx855_pci_driver = {
	.name		= "vx855",
	.id_table	= vx855_pci_tbl,
	.probe		= vx855_probe,
	.remove		= vx855_remove,
};

module_pci_driver(vx855_pci_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
MODULE_DESCRIPTION("Driver for the VIA VX855 chipset");