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 * Copyright (c) 2014 Intel Corp. 11 * Author: Denis Turischev <denis@compulab.co.il> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License 2 as published 15 * by the Free Software Foundation. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/errno.h> 26 #include <linux/acpi.h> 27 #include <linux/pci.h> 28 #include <linux/mfd/core.h> 29 30 #define SMBASE 0x40 31 #define SMBUS_IO_SIZE 64 32 33 #define GPIOBASE 0x44 34 #define GPIO_IO_SIZE 64 35 #define GPIO_IO_SIZE_CENTERTON 128 36 37 /* Intel Quark X1000 GPIO IRQ Number */ 38 #define GPIO_IRQ_QUARK_X1000 9 39 40 #define WDTBASE 0x84 41 #define WDT_IO_SIZE 64 42 43 enum sch_chipsets { 44 LPC_SCH = 0, /* Intel Poulsbo SCH */ 45 LPC_ITC, /* Intel Tunnel Creek */ 46 LPC_CENTERTON, /* Intel Centerton */ 47 LPC_QUARK_X1000, /* Intel Quark X1000 */ 48 }; 49 50 struct lpc_sch_info { 51 unsigned int io_size_smbus; 52 unsigned int io_size_gpio; 53 unsigned int io_size_wdt; 54 int irq_gpio; 55 }; 56 57 static struct lpc_sch_info sch_chipset_info[] = { 58 [LPC_SCH] = { 59 .io_size_smbus = SMBUS_IO_SIZE, 60 .io_size_gpio = GPIO_IO_SIZE, 61 .irq_gpio = -1, 62 }, 63 [LPC_ITC] = { 64 .io_size_smbus = SMBUS_IO_SIZE, 65 .io_size_gpio = GPIO_IO_SIZE, 66 .io_size_wdt = WDT_IO_SIZE, 67 .irq_gpio = -1, 68 }, 69 [LPC_CENTERTON] = { 70 .io_size_smbus = SMBUS_IO_SIZE, 71 .io_size_gpio = GPIO_IO_SIZE_CENTERTON, 72 .io_size_wdt = WDT_IO_SIZE, 73 .irq_gpio = -1, 74 }, 75 [LPC_QUARK_X1000] = { 76 .io_size_gpio = GPIO_IO_SIZE, 77 .irq_gpio = GPIO_IRQ_QUARK_X1000, 78 }, 79 }; 80 81 static const struct pci_device_id lpc_sch_ids[] = { 82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC), LPC_SCH }, 83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC), LPC_ITC }, 84 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB), LPC_CENTERTON }, 85 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB), LPC_QUARK_X1000 }, 86 { 0, } 87 }; 88 MODULE_DEVICE_TABLE(pci, lpc_sch_ids); 89 90 #define LPC_NO_RESOURCE 1 91 #define LPC_SKIP_RESOURCE 2 92 93 static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name, 94 struct resource *res, int size) 95 { 96 unsigned int base_addr_cfg; 97 unsigned short base_addr; 98 99 if (size == 0) 100 return LPC_NO_RESOURCE; 101 102 pci_read_config_dword(pdev, where, &base_addr_cfg); 103 base_addr = 0; 104 if (!(base_addr_cfg & (1 << 31))) 105 dev_warn(&pdev->dev, "Decode of the %s I/O range disabled\n", 106 name); 107 else 108 base_addr = (unsigned short)base_addr_cfg; 109 110 if (base_addr == 0) { 111 dev_warn(&pdev->dev, "I/O space for %s uninitialized\n", name); 112 return LPC_SKIP_RESOURCE; 113 } 114 115 res->start = base_addr; 116 res->end = base_addr + size - 1; 117 res->flags = IORESOURCE_IO; 118 119 return 0; 120 } 121 122 static int lpc_sch_populate_cell(struct pci_dev *pdev, int where, 123 const char *name, int size, int irq, 124 int id, struct mfd_cell *cell) 125 { 126 struct resource *res; 127 int ret; 128 129 res = devm_kcalloc(&pdev->dev, 2, sizeof(*res), GFP_KERNEL); 130 if (!res) 131 return -ENOMEM; 132 133 ret = lpc_sch_get_io(pdev, where, name, res, size); 134 if (ret) 135 return ret; 136 137 memset(cell, 0, sizeof(*cell)); 138 139 cell->name = name; 140 cell->resources = res; 141 cell->num_resources = 1; 142 cell->ignore_resource_conflicts = true; 143 cell->id = id; 144 145 /* Check if we need to add an IRQ resource */ 146 if (irq < 0) 147 return 0; 148 149 res++; 150 151 res->start = irq; 152 res->end = irq; 153 res->flags = IORESOURCE_IRQ; 154 155 cell->num_resources++; 156 157 return 0; 158 } 159 160 static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id) 161 { 162 struct mfd_cell lpc_sch_cells[3]; 163 struct lpc_sch_info *info = &sch_chipset_info[id->driver_data]; 164 unsigned int cells = 0; 165 int ret; 166 167 ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus", 168 info->io_size_smbus, -1, 169 id->device, &lpc_sch_cells[cells]); 170 if (ret < 0) 171 return ret; 172 if (ret == 0) 173 cells++; 174 175 ret = lpc_sch_populate_cell(dev, GPIOBASE, "sch_gpio", 176 info->io_size_gpio, info->irq_gpio, 177 id->device, &lpc_sch_cells[cells]); 178 if (ret < 0) 179 return ret; 180 if (ret == 0) 181 cells++; 182 183 ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt", 184 info->io_size_wdt, -1, 185 id->device, &lpc_sch_cells[cells]); 186 if (ret < 0) 187 return ret; 188 if (ret == 0) 189 cells++; 190 191 if (cells == 0) { 192 dev_err(&dev->dev, "All decode registers disabled.\n"); 193 return -ENODEV; 194 } 195 196 return mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL); 197 } 198 199 static void lpc_sch_remove(struct pci_dev *dev) 200 { 201 mfd_remove_devices(&dev->dev); 202 } 203 204 static struct pci_driver lpc_sch_driver = { 205 .name = "lpc_sch", 206 .id_table = lpc_sch_ids, 207 .probe = lpc_sch_probe, 208 .remove = lpc_sch_remove, 209 }; 210 211 module_pci_driver(lpc_sch_driver); 212 213 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>"); 214 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH"); 215 MODULE_LICENSE("GPL"); 216