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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 | static struct resource smbus_sch_resource = { |
41 | .flags = IORESOURCE_IO, |
42 | }; |
43 | |
44 | |
45 | static struct resource gpio_sch_resource = { |
46 | .flags = IORESOURCE_IO, |
47 | }; |
48 | |
49 | static struct mfd_cell lpc_sch_cells[] = { |
50 | { |
51 | .name = "isch_smbus", |
52 | .num_resources = 1, |
53 | .resources = &smbus_sch_resource, |
54 | }, |
55 | { |
56 | .name = "sch_gpio", |
57 | .num_resources = 1, |
58 | .resources = &gpio_sch_resource, |
59 | }, |
60 | }; |
61 | |
62 | static struct pci_device_id lpc_sch_ids[] = { |
63 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) }, |
64 | { 0, } |
65 | }; |
66 | MODULE_DEVICE_TABLE(pci, lpc_sch_ids); |
67 | |
68 | static int __devinit lpc_sch_probe(struct pci_dev *dev, |
69 | const struct pci_device_id *id) |
70 | { |
71 | unsigned int base_addr_cfg; |
72 | unsigned short base_addr; |
73 | |
74 | pci_read_config_dword(dev, SMBASE, &base_addr_cfg); |
75 | if (!(base_addr_cfg & (1 << 31))) { |
76 | dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n"); |
77 | return -ENODEV; |
78 | } |
79 | base_addr = (unsigned short)base_addr_cfg; |
80 | if (base_addr == 0) { |
81 | dev_err(&dev->dev, "I/O space for SMBus uninitialized\n"); |
82 | return -ENODEV; |
83 | } |
84 | |
85 | smbus_sch_resource.start = base_addr; |
86 | smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1; |
87 | |
88 | pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg); |
89 | if (!(base_addr_cfg & (1 << 31))) { |
90 | dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n"); |
91 | return -ENODEV; |
92 | } |
93 | base_addr = (unsigned short)base_addr_cfg; |
94 | if (base_addr == 0) { |
95 | dev_err(&dev->dev, "I/O space for GPIO uninitialized\n"); |
96 | return -ENODEV; |
97 | } |
98 | |
99 | gpio_sch_resource.start = base_addr; |
100 | gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1; |
101 | |
102 | return mfd_add_devices(&dev->dev, -1, |
103 | lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0); |
104 | } |
105 | |
106 | static void __devexit lpc_sch_remove(struct pci_dev *dev) |
107 | { |
108 | mfd_remove_devices(&dev->dev); |
109 | } |
110 | |
111 | static struct pci_driver lpc_sch_driver = { |
112 | .name = "lpc_sch", |
113 | .id_table = lpc_sch_ids, |
114 | .probe = lpc_sch_probe, |
115 | .remove = __devexit_p(lpc_sch_remove), |
116 | }; |
117 | |
118 | static int __init lpc_sch_init(void) |
119 | { |
120 | return pci_register_driver(&lpc_sch_driver); |
121 | } |
122 | |
123 | static void __exit lpc_sch_exit(void) |
124 | { |
125 | pci_unregister_driver(&lpc_sch_driver); |
126 | } |
127 | |
128 | module_init(lpc_sch_init); |
129 | module_exit(lpc_sch_exit); |
130 | |
131 | MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); |
132 | MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH"); |
133 | MODULE_LICENSE("GPL"); |
134 |
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