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,
62 .ignore_resource_conflicts = true,
65 static struct mfd_cell sch_gpio_cell = {
68 .resources = &gpio_sch_resource,
69 .ignore_resource_conflicts = true,
72 static struct mfd_cell wdt_sch_cell = {
75 .resources = &wdt_sch_resource,
76 .ignore_resource_conflicts = true,
79 static const struct pci_device_id lpc_sch_ids[] = {
80 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
81 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
82 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB) },
85 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
87 static int lpc_sch_probe(struct pci_dev *dev,
88 const struct pci_device_id *id)
90 unsigned int base_addr_cfg;
91 unsigned short base_addr;
95 pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
97 if (!(base_addr_cfg & (1 << 31)))
98 dev_warn(&dev->dev, "Decode of the SMBus I/O range disabled\n");
100 base_addr = (unsigned short)base_addr_cfg;
102 if (base_addr == 0) {
103 dev_warn(&dev->dev, "I/O space for SMBus uninitialized\n");
105 lpc_sch_cells[cells++] = isch_smbus_cell;
106 smbus_sch_resource.start = base_addr;
107 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
110 pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
112 if (!(base_addr_cfg & (1 << 31)))
113 dev_warn(&dev->dev, "Decode of the GPIO I/O range disabled\n");
115 base_addr = (unsigned short)base_addr_cfg;
117 if (base_addr == 0) {
118 dev_warn(&dev->dev, "I/O space for GPIO uninitialized\n");
120 lpc_sch_cells[cells++] = sch_gpio_cell;
121 gpio_sch_resource.start = base_addr;
122 if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
123 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
125 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
128 if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
129 || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
130 pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
132 if (!(base_addr_cfg & (1 << 31)))
133 dev_warn(&dev->dev, "Decode of the WDT I/O range disabled\n");
135 base_addr = (unsigned short)base_addr_cfg;
137 dev_warn(&dev->dev, "I/O space for WDT uninitialized\n");
139 lpc_sch_cells[cells++] = wdt_sch_cell;
140 wdt_sch_resource.start = base_addr;
141 wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
145 if (WARN_ON(cells > ARRAY_SIZE(lpc_sch_cells))) {
146 dev_err(&dev->dev, "Cell count exceeds array size");
151 dev_err(&dev->dev, "All decode registers disabled.\n");
155 for (i = 0; i < cells; i++)
156 lpc_sch_cells[i].id = id->device;
158 ret = mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
160 mfd_remove_devices(&dev->dev);
165 static void lpc_sch_remove(struct pci_dev *dev)
167 mfd_remove_devices(&dev->dev);
170 static struct pci_driver lpc_sch_driver = {
172 .id_table = lpc_sch_ids,
173 .probe = lpc_sch_probe,
174 .remove = lpc_sch_remove,
177 module_pci_driver(lpc_sch_driver);
179 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
180 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
181 MODULE_LICENSE("GPL");