regmap: merge 7cccbdc84487616c3dbe493b04bfa1f362f4bc56
[linux-2.6.git] / drivers / mfd / lpc_sch.c
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 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 };
82 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
83
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
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
170 static int __init lpc_sch_init(void)
171 {
172         return pci_register_driver(&lpc_sch_driver);
173 }
174
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");