2 * lpc_sch.c - LPC interface for Intel Poulsbo SCH
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.
9 * Copyright (c) 2010 CompuLab Ltd
10 * Author: Denis Turischev <denis@compulab.co.il>
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.
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.
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.
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>
35 #define SMBUS_IO_SIZE 64
38 #define GPIO_IO_SIZE 64
40 static struct resource smbus_sch_resource = {
41 .flags = IORESOURCE_IO,
45 static struct resource gpio_sch_resource = {
46 .flags = IORESOURCE_IO,
49 static struct mfd_cell lpc_sch_cells[] = {
53 .resources = &smbus_sch_resource,
58 .resources = &gpio_sch_resource,
62 static struct pci_device_id lpc_sch_ids[] = {
63 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
66 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
68 static int __devinit lpc_sch_probe(struct pci_dev *dev,
69 const struct pci_device_id *id)
71 unsigned int base_addr_cfg;
72 unsigned short base_addr;
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");
79 base_addr = (unsigned short)base_addr_cfg;
81 dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
85 smbus_sch_resource.start = base_addr;
86 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
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");
93 base_addr = (unsigned short)base_addr_cfg;
95 dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
99 gpio_sch_resource.start = base_addr;
100 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
102 return mfd_add_devices(&dev->dev, -1,
103 lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
106 static void __devexit lpc_sch_remove(struct pci_dev *dev)
108 mfd_remove_devices(&dev->dev);
111 static struct pci_driver lpc_sch_driver = {
113 .id_table = lpc_sch_ids,
114 .probe = lpc_sch_probe,
115 .remove = __devexit_p(lpc_sch_remove),
118 static int __init lpc_sch_init(void)
120 return pci_register_driver(&lpc_sch_driver);
123 static void __exit lpc_sch_exit(void)
125 pci_unregister_driver(&lpc_sch_driver);
128 module_init(lpc_sch_init);
129 module_exit(lpc_sch_exit);
131 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
132 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
133 MODULE_LICENSE("GPL");