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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 struct pci_device_id 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");
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#define GPIO_IO_SIZE_CENTERTON 128
40
41#define WDTBASE 0x84
42#define WDT_IO_SIZE 64
43
44static struct resource smbus_sch_resource = {
45 .flags = IORESOURCE_IO,
46};
47
48
49static struct resource gpio_sch_resource = {
50 .flags = IORESOURCE_IO,
51};
52
53static struct mfd_cell lpc_sch_cells[] = {
54 {
55 .name = "isch_smbus",
56 .num_resources = 1,
57 .resources = &smbus_sch_resource,
58 },
59 {
60 .name = "sch_gpio",
61 .num_resources = 1,
62 .resources = &gpio_sch_resource,
63 },
64};
65
66static struct resource wdt_sch_resource = {
67 .flags = IORESOURCE_IO,
68};
69
70static struct mfd_cell tunnelcreek_cells[] = {
71 {
72 .name = "ie6xx_wdt",
73 .num_resources = 1,
74 .resources = &wdt_sch_resource,
75 },
76};
77
78static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
79 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
80 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
81 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB) },
82 { 0, }
83};
84MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
85
86static int __devinit lpc_sch_probe(struct pci_dev *dev,
87 const struct pci_device_id *id)
88{
89 unsigned int base_addr_cfg;
90 unsigned short base_addr;
91 int i;
92 int ret;
93
94 pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
95 if (!(base_addr_cfg & (1 << 31))) {
96 dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
97 return -ENODEV;
98 }
99 base_addr = (unsigned short)base_addr_cfg;
100 if (base_addr == 0) {
101 dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
102 return -ENODEV;
103 }
104
105 smbus_sch_resource.start = base_addr;
106 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
107
108 pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
109 if (!(base_addr_cfg & (1 << 31))) {
110 dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
111 return -ENODEV;
112 }
113 base_addr = (unsigned short)base_addr_cfg;
114 if (base_addr == 0) {
115 dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
116 return -ENODEV;
117 }
118
119 gpio_sch_resource.start = base_addr;
120
121 if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
122 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
123 else
124 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
125
126 for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
127 lpc_sch_cells[i].id = id->device;
128
129 ret = mfd_add_devices(&dev->dev, 0,
130 lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
131 if (ret)
132 goto out_dev;
133
134 if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
135 || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
136 pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
137 if (!(base_addr_cfg & (1 << 31))) {
138 dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
139 ret = -ENODEV;
140 goto out_dev;
141 }
142 base_addr = (unsigned short)base_addr_cfg;
143 if (base_addr == 0) {
144 dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
145 ret = -ENODEV;
146 goto out_dev;
147 }
148
149 wdt_sch_resource.start = base_addr;
150 wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
151
152 for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
153 tunnelcreek_cells[i].id = id->device;
154
155 ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
156 ARRAY_SIZE(tunnelcreek_cells), NULL, 0);
157 }
158
159 return ret;
160out_dev:
161 mfd_remove_devices(&dev->dev);
162 return ret;
163}
164
165static void __devexit lpc_sch_remove(struct pci_dev *dev)
166{
167 mfd_remove_devices(&dev->dev);
168}
169
170static struct pci_driver lpc_sch_driver = {
171 .name = "lpc_sch",
172 .id_table = lpc_sch_ids,
173 .probe = lpc_sch_probe,
174 .remove = __devexit_p(lpc_sch_remove),
175};
176
177module_pci_driver(lpc_sch_driver);
178
179MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
180MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
181MODULE_LICENSE("GPL");