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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"); |