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
43 static struct resource smbus_sch_resource = {
44 .flags = IORESOURCE_IO,
45 };
46
47
48 static struct resource gpio_sch_resource = {
49 .flags = IORESOURCE_IO,
50 };
51
52 static 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
65 static struct resource wdt_sch_resource = {
66 .flags = IORESOURCE_IO,
67 };
68
69 static struct mfd_cell tunnelcreek_cells[] = {
70 {
71 .name = "tunnelcreek_wdt",
72 .num_resources = 1,
73 .resources = &wdt_sch_resource,
74 },
75 };
76
77 static 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 };
82 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
83
lpc_sch_probe(struct pci_dev * dev,const struct pci_device_id * id)84 static 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;
153 out_dev:
154 mfd_remove_devices(&dev->dev);
155 return ret;
156 }
157
lpc_sch_remove(struct pci_dev * dev)158 static void __devexit lpc_sch_remove(struct pci_dev *dev)
159 {
160 mfd_remove_devices(&dev->dev);
161 }
162
163 static 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
lpc_sch_init(void)170 static int __init lpc_sch_init(void)
171 {
172 return pci_register_driver(&lpc_sch_driver);
173 }
174
lpc_sch_exit(void)175 static void __exit lpc_sch_exit(void)
176 {
177 pci_unregister_driver(&lpc_sch_driver);
178 }
179
180 module_init(lpc_sch_init);
181 module_exit(lpc_sch_exit);
182
183 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
184 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
185 MODULE_LICENSE("GPL");
186