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 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) }, 65 { 0, } 66 }; 67 MODULE_DEVICE_TABLE(pci, lpc_sch_ids); 68 69 static int __devinit lpc_sch_probe(struct pci_dev *dev, 70 const struct pci_device_id *id) 71 { 72 unsigned int base_addr_cfg; 73 unsigned short base_addr; 74 int i; 75 76 pci_read_config_dword(dev, SMBASE, &base_addr_cfg); 77 if (!(base_addr_cfg & (1 << 31))) { 78 dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n"); 79 return -ENODEV; 80 } 81 base_addr = (unsigned short)base_addr_cfg; 82 if (base_addr == 0) { 83 dev_err(&dev->dev, "I/O space for SMBus uninitialized\n"); 84 return -ENODEV; 85 } 86 87 smbus_sch_resource.start = base_addr; 88 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1; 89 90 pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg); 91 if (!(base_addr_cfg & (1 << 31))) { 92 dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n"); 93 return -ENODEV; 94 } 95 base_addr = (unsigned short)base_addr_cfg; 96 if (base_addr == 0) { 97 dev_err(&dev->dev, "I/O space for GPIO uninitialized\n"); 98 return -ENODEV; 99 } 100 101 gpio_sch_resource.start = base_addr; 102 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1; 103 104 for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++) 105 lpc_sch_cells[i].id = id->device; 106 107 return mfd_add_devices(&dev->dev, 0, 108 lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0); 109 } 110 111 static void __devexit lpc_sch_remove(struct pci_dev *dev) 112 { 113 mfd_remove_devices(&dev->dev); 114 } 115 116 static struct pci_driver lpc_sch_driver = { 117 .name = "lpc_sch", 118 .id_table = lpc_sch_ids, 119 .probe = lpc_sch_probe, 120 .remove = __devexit_p(lpc_sch_remove), 121 }; 122 123 static int __init lpc_sch_init(void) 124 { 125 return pci_register_driver(&lpc_sch_driver); 126 } 127 128 static void __exit lpc_sch_exit(void) 129 { 130 pci_unregister_driver(&lpc_sch_driver); 131 } 132 133 module_init(lpc_sch_init); 134 module_exit(lpc_sch_exit); 135 136 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); 137 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH"); 138 MODULE_LICENSE("GPL"); 139