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 40static struct resource smbus_sch_resource = { 41 .flags = IORESOURCE_IO, 42}; 43 44 45static struct resource gpio_sch_resource = { 46 .flags = IORESOURCE_IO, 47}; 48 49static 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 62static struct pci_device_id lpc_sch_ids[] = { 63 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) }, 64 { 0, } 65}; 66MODULE_DEVICE_TABLE(pci, lpc_sch_ids); 67 68static 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 106static void __devexit lpc_sch_remove(struct pci_dev *dev) 107{ 108 mfd_remove_devices(&dev->dev); 109} 110 111static 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 118static int __init lpc_sch_init(void) 119{ 120 return pci_register_driver(&lpc_sch_driver); 121} 122 123static void __exit lpc_sch_exit(void) 124{ 125 pci_unregister_driver(&lpc_sch_driver); 126} 127 128module_init(lpc_sch_init); 129module_exit(lpc_sch_exit); 130 131MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); 132MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH"); 133MODULE_LICENSE("GPL"); 134