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 #define WDTBASE 0x84 41 #define WDT_IO_SIZE 64 42 43 static struct resource smbus_sch_resource = { 44 .flags = IORESOURCE_IO, 45 }; 46 47 48 static struct resource gpio_sch_resource = { 49 .flags = IORESOURCE_IO, 50 }; 51 52 static struct mfd_cell lpc_sch_cells[] = { 53 { 54 .name = "isch_smbus", 55 .num_resources = 1, 56 .resources = &smbus_sch_resource, 57 }, 58 { 59 .name = "sch_gpio", 60 .num_resources = 1, 61 .resources = &gpio_sch_resource, 62 }, 63 }; 64 65 static struct resource wdt_sch_resource = { 66 .flags = IORESOURCE_IO, 67 }; 68 69 static struct mfd_cell tunnelcreek_cells[] = { 70 { 71 .name = "tunnelcreek_wdt", 72 .num_resources = 1, 73 .resources = &wdt_sch_resource, 74 }, 75 }; 76 77 static struct pci_device_id lpc_sch_ids[] = { 78 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) }, 79 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) }, 80 { 0, } 81 }; 82 MODULE_DEVICE_TABLE(pci, lpc_sch_ids); 83 84 static int __devinit lpc_sch_probe(struct pci_dev *dev, 85 const struct pci_device_id *id) 86 { 87 unsigned int base_addr_cfg; 88 unsigned short base_addr; 89 int i; 90 int ret; 91 92 pci_read_config_dword(dev, SMBASE, &base_addr_cfg); 93 if (!(base_addr_cfg & (1 << 31))) { 94 dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n"); 95 return -ENODEV; 96 } 97 base_addr = (unsigned short)base_addr_cfg; 98 if (base_addr == 0) { 99 dev_err(&dev->dev, "I/O space for SMBus uninitialized\n"); 100 return -ENODEV; 101 } 102 103 smbus_sch_resource.start = base_addr; 104 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1; 105 106 pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg); 107 if (!(base_addr_cfg & (1 << 31))) { 108 dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n"); 109 return -ENODEV; 110 } 111 base_addr = (unsigned short)base_addr_cfg; 112 if (base_addr == 0) { 113 dev_err(&dev->dev, "I/O space for GPIO uninitialized\n"); 114 return -ENODEV; 115 } 116 117 gpio_sch_resource.start = base_addr; 118 gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1; 119 120 for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++) 121 lpc_sch_cells[i].id = id->device; 122 123 ret = mfd_add_devices(&dev->dev, 0, 124 lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0); 125 if (ret) 126 goto out_dev; 127 128 if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC) { 129 pci_read_config_dword(dev, WDTBASE, &base_addr_cfg); 130 if (!(base_addr_cfg & (1 << 31))) { 131 dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n"); 132 ret = -ENODEV; 133 goto out_dev; 134 } 135 base_addr = (unsigned short)base_addr_cfg; 136 if (base_addr == 0) { 137 dev_err(&dev->dev, "I/O space for WDT uninitialized\n"); 138 ret = -ENODEV; 139 goto out_dev; 140 } 141 142 wdt_sch_resource.start = base_addr; 143 wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1; 144 145 for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++) 146 tunnelcreek_cells[i].id = id->device; 147 148 ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells, 149 ARRAY_SIZE(tunnelcreek_cells), NULL, 0); 150 } 151 152 return ret; 153 out_dev: 154 mfd_remove_devices(&dev->dev); 155 return ret; 156 } 157 158 static void __devexit lpc_sch_remove(struct pci_dev *dev) 159 { 160 mfd_remove_devices(&dev->dev); 161 } 162 163 static struct pci_driver lpc_sch_driver = { 164 .name = "lpc_sch", 165 .id_table = lpc_sch_ids, 166 .probe = lpc_sch_probe, 167 .remove = __devexit_p(lpc_sch_remove), 168 }; 169 170 static int __init lpc_sch_init(void) 171 { 172 return pci_register_driver(&lpc_sch_driver); 173 } 174 175 static void __exit lpc_sch_exit(void) 176 { 177 pci_unregister_driver(&lpc_sch_driver); 178 } 179 180 module_init(lpc_sch_init); 181 module_exit(lpc_sch_exit); 182 183 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); 184 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH"); 185 MODULE_LICENSE("GPL"); 186