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
39 #define GPIO_IO_SIZE_CENTERTON 128
42 #define WDT_IO_SIZE 64
44 static struct resource smbus_sch_resource = {
45 .flags = IORESOURCE_IO,
48 static struct resource gpio_sch_resource = {
49 .flags = IORESOURCE_IO,
52 static struct resource wdt_sch_resource = {
53 .flags = IORESOURCE_IO,
56 static struct mfd_cell lpc_sch_cells[3];
58 static struct mfd_cell isch_smbus_cell = {
61 .resources = &smbus_sch_resource,
64 static struct mfd_cell sch_gpio_cell = {
67 .resources = &gpio_sch_resource,
70 static struct mfd_cell wdt_sch_cell = {
73 .resources = &wdt_sch_resource,
76 static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
77 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
78 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
79 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB) },
82 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
84 static int lpc_sch_probe(struct pci_dev *dev,
85 const struct pci_device_id *id)
87 unsigned int base_addr_cfg;
88 unsigned short base_addr;
92 pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
94 if (!(base_addr_cfg & (1 << 31)))
95 dev_warn(&dev->dev, "Decode of the SMBus I/O range disabled\n");
97 base_addr = (unsigned short)base_addr_cfg;
100 dev_warn(&dev->dev, "I/O space for SMBus uninitialized\n");
102 lpc_sch_cells[cells++] = isch_smbus_cell;
103 smbus_sch_resource.start = base_addr;
104 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
107 pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
109 if (!(base_addr_cfg & (1 << 31)))
110 dev_warn(&dev->dev, "Decode of the GPIO I/O range disabled\n");
112 base_addr = (unsigned short)base_addr_cfg;
114 if (base_addr == 0) {
115 dev_warn(&dev->dev, "I/O space for GPIO uninitialized\n");
117 lpc_sch_cells[cells++] = sch_gpio_cell;
118 gpio_sch_resource.start = base_addr;
119 if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
120 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
122 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
125 if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
126 || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
127 pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
129 if (!(base_addr_cfg & (1 << 31)))
130 dev_warn(&dev->dev, "Decode of the WDT I/O range disabled\n");
132 base_addr = (unsigned short)base_addr_cfg;
134 dev_warn(&dev->dev, "I/O space for WDT uninitialized\n");
136 lpc_sch_cells[cells++] = wdt_sch_cell;
137 wdt_sch_resource.start = base_addr;
138 wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
142 if (WARN_ON(cells > ARRAY_SIZE(lpc_sch_cells))) {
143 dev_err(&dev->dev, "Cell count exceeds array size");
148 dev_err(&dev->dev, "All decode registers disabled.\n");
152 for (i = 0; i < cells; i++)
153 lpc_sch_cells[i].id = id->device;
155 ret = mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
157 mfd_remove_devices(&dev->dev);
162 static void lpc_sch_remove(struct pci_dev *dev)
164 mfd_remove_devices(&dev->dev);
167 static struct pci_driver lpc_sch_driver = {
169 .id_table = lpc_sch_ids,
170 .probe = lpc_sch_probe,
171 .remove = lpc_sch_remove,
174 module_pci_driver(lpc_sch_driver);
176 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
177 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
178 MODULE_LICENSE("GPL");