1/*
2 *  lpc_sch.c - LPC interface for Intel Poulsbo SCH
3 *
4 *  LPC bridge function of the Intel SCH contains many other
5 *  functional units, such as Interrupt controllers, Timers,
6 *  Power Management, System Management, GPIO, RTC, and LPC
7 *  Configuration Registers.
8 *
9 *  Copyright (c) 2010 CompuLab Ltd
10 *  Author: Denis Turischev <denis@compulab.co.il>
11 *
12 *  This program is free software; you can redistribute it and/or modify
13 *  it under the terms of the GNU General Public License 2 as published
14 *  by the Free Software Foundation.
15 *
16 *  This program is distributed in the hope that it will be useful,
17 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
18 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 *  GNU General Public License for more details.
20 *
21 *  You should have received a copy of the GNU General Public License
22 *  along with this program; see the file COPYING.  If not, write to
23 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/acpi.h>
31#include <linux/pci.h>
32#include <linux/mfd/core.h>
33
34#define SMBASE		0x40
35#define SMBUS_IO_SIZE	64
36
37#define GPIOBASE	0x44
38#define GPIO_IO_SIZE	64
39
40#define WDTBASE		0x84
41#define WDT_IO_SIZE	64
42
43static struct resource smbus_sch_resource = {
44		.flags = IORESOURCE_IO,
45};
46
47
48static struct resource gpio_sch_resource = {
49		.flags = IORESOURCE_IO,
50};
51
52static struct mfd_cell lpc_sch_cells[] = {
53	{
54		.name = "isch_smbus",
55		.num_resources = 1,
56		.resources = &smbus_sch_resource,
57	},
58	{
59		.name = "sch_gpio",
60		.num_resources = 1,
61		.resources = &gpio_sch_resource,
62	},
63};
64
65static struct resource wdt_sch_resource = {
66		.flags = IORESOURCE_IO,
67};
68
69static struct mfd_cell tunnelcreek_cells[] = {
70	{
71		.name = "tunnelcreek_wdt",
72		.num_resources = 1,
73		.resources = &wdt_sch_resource,
74	},
75};
76
77static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
78	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
79	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
80	{ 0, }
81};
82MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
83
84static int __devinit lpc_sch_probe(struct pci_dev *dev,
85				const struct pci_device_id *id)
86{
87	unsigned int base_addr_cfg;
88	unsigned short base_addr;
89	int i;
90	int ret;
91
92	pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
93	if (!(base_addr_cfg & (1 << 31))) {
94		dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
95		return -ENODEV;
96	}
97	base_addr = (unsigned short)base_addr_cfg;
98	if (base_addr == 0) {
99		dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
100		return -ENODEV;
101	}
102
103	smbus_sch_resource.start = base_addr;
104	smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
105
106	pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
107	if (!(base_addr_cfg & (1 << 31))) {
108		dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
109		return -ENODEV;
110	}
111	base_addr = (unsigned short)base_addr_cfg;
112	if (base_addr == 0) {
113		dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
114		return -ENODEV;
115	}
116
117	gpio_sch_resource.start = base_addr;
118	gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
119
120	for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
121		lpc_sch_cells[i].id = id->device;
122
123	ret = mfd_add_devices(&dev->dev, 0,
124			lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
125	if (ret)
126		goto out_dev;
127
128	if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC) {
129		pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
130		if (!(base_addr_cfg & (1 << 31))) {
131			dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
132			ret = -ENODEV;
133			goto out_dev;
134		}
135		base_addr = (unsigned short)base_addr_cfg;
136		if (base_addr == 0) {
137			dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
138			ret = -ENODEV;
139			goto out_dev;
140		}
141
142		wdt_sch_resource.start = base_addr;
143		wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
144
145		for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
146			tunnelcreek_cells[i].id = id->device;
147
148		ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
149			ARRAY_SIZE(tunnelcreek_cells), NULL, 0);
150	}
151
152	return ret;
153out_dev:
154	mfd_remove_devices(&dev->dev);
155	return ret;
156}
157
158static void __devexit lpc_sch_remove(struct pci_dev *dev)
159{
160	mfd_remove_devices(&dev->dev);
161}
162
163static struct pci_driver lpc_sch_driver = {
164	.name		= "lpc_sch",
165	.id_table	= lpc_sch_ids,
166	.probe		= lpc_sch_probe,
167	.remove		= __devexit_p(lpc_sch_remove),
168};
169
170static int __init lpc_sch_init(void)
171{
172	return pci_register_driver(&lpc_sch_driver);
173}
174
175static void __exit lpc_sch_exit(void)
176{
177	pci_unregister_driver(&lpc_sch_driver);
178}
179
180module_init(lpc_sch_init);
181module_exit(lpc_sch_exit);
182
183MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
184MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
185MODULE_LICENSE("GPL");
186