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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * lpc_sch.c - LPC interface for Intel Poulsbo SCH4 *5 * LPC bridge function of the Intel SCH contains many other6 * functional units, such as Interrupt controllers, Timers,7 * Power Management, System Management, GPIO, RTC, and LPC8 * Configuration Registers.9 *10 * Copyright (c) 2010 CompuLab Ltd11 * Copyright (c) 2014 Intel Corp.12 * Author: Denis Turischev <denis@compulab.co.il>13 */14 15#include <linux/kernel.h>16#include <linux/module.h>17#include <linux/errno.h>18#include <linux/acpi.h>19#include <linux/pci.h>20#include <linux/mfd/core.h>21 22#define SMBASE 0x4023#define SMBUS_IO_SIZE 6424 25#define GPIO_BASE 0x4426#define GPIO_IO_SIZE 6427#define GPIO_IO_SIZE_CENTERTON 12828 29#define WDTBASE 0x8430#define WDT_IO_SIZE 6431 32enum sch_chipsets {33 LPC_SCH = 0, /* Intel Poulsbo SCH */34 LPC_ITC, /* Intel Tunnel Creek */35 LPC_CENTERTON, /* Intel Centerton */36 LPC_QUARK_X1000, /* Intel Quark X1000 */37};38 39struct lpc_sch_info {40 unsigned int io_size_smbus;41 unsigned int io_size_gpio;42 unsigned int io_size_wdt;43};44 45static struct lpc_sch_info sch_chipset_info[] = {46 [LPC_SCH] = {47 .io_size_smbus = SMBUS_IO_SIZE,48 .io_size_gpio = GPIO_IO_SIZE,49 },50 [LPC_ITC] = {51 .io_size_smbus = SMBUS_IO_SIZE,52 .io_size_gpio = GPIO_IO_SIZE,53 .io_size_wdt = WDT_IO_SIZE,54 },55 [LPC_CENTERTON] = {56 .io_size_smbus = SMBUS_IO_SIZE,57 .io_size_gpio = GPIO_IO_SIZE_CENTERTON,58 .io_size_wdt = WDT_IO_SIZE,59 },60 [LPC_QUARK_X1000] = {61 .io_size_gpio = GPIO_IO_SIZE,62 .io_size_wdt = WDT_IO_SIZE,63 },64};65 66static const struct pci_device_id lpc_sch_ids[] = {67 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC), LPC_SCH },68 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC), LPC_ITC },69 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB), LPC_CENTERTON },70 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB), LPC_QUARK_X1000 },71 { 0, }72};73MODULE_DEVICE_TABLE(pci, lpc_sch_ids);74 75#define LPC_NO_RESOURCE 176#define LPC_SKIP_RESOURCE 277 78static int lpc_sch_get_io(struct pci_dev *pdev, int where, const char *name,79 struct resource *res, int size)80{81 unsigned int base_addr_cfg;82 unsigned short base_addr;83 84 if (size == 0)85 return LPC_NO_RESOURCE;86 87 pci_read_config_dword(pdev, where, &base_addr_cfg);88 base_addr = 0;89 if (!(base_addr_cfg & (1 << 31)))90 dev_warn(&pdev->dev, "Decode of the %s I/O range disabled\n",91 name);92 else93 base_addr = (unsigned short)base_addr_cfg;94 95 if (base_addr == 0) {96 dev_warn(&pdev->dev, "I/O space for %s uninitialized\n", name);97 return LPC_SKIP_RESOURCE;98 }99 100 res->start = base_addr;101 res->end = base_addr + size - 1;102 res->flags = IORESOURCE_IO;103 104 return 0;105}106 107static int lpc_sch_populate_cell(struct pci_dev *pdev, int where,108 const char *name, int size, int id,109 struct mfd_cell *cell)110{111 struct resource *res;112 int ret;113 114 res = devm_kzalloc(&pdev->dev, sizeof(*res), GFP_KERNEL);115 if (!res)116 return -ENOMEM;117 118 ret = lpc_sch_get_io(pdev, where, name, res, size);119 if (ret)120 return ret;121 122 memset(cell, 0, sizeof(*cell));123 124 cell->name = name;125 cell->resources = res;126 cell->num_resources = 1;127 cell->ignore_resource_conflicts = true;128 cell->id = id;129 130 return 0;131}132 133static int lpc_sch_probe(struct pci_dev *dev, const struct pci_device_id *id)134{135 struct mfd_cell lpc_sch_cells[3];136 struct lpc_sch_info *info = &sch_chipset_info[id->driver_data];137 unsigned int cells = 0;138 int ret;139 140 ret = lpc_sch_populate_cell(dev, SMBASE, "isch_smbus",141 info->io_size_smbus,142 id->device, &lpc_sch_cells[cells]);143 if (ret < 0)144 return ret;145 if (ret == 0)146 cells++;147 148 ret = lpc_sch_populate_cell(dev, GPIO_BASE, "sch_gpio",149 info->io_size_gpio,150 id->device, &lpc_sch_cells[cells]);151 if (ret < 0)152 return ret;153 if (ret == 0)154 cells++;155 156 ret = lpc_sch_populate_cell(dev, WDTBASE, "ie6xx_wdt",157 info->io_size_wdt,158 id->device, &lpc_sch_cells[cells]);159 if (ret < 0)160 return ret;161 if (ret == 0)162 cells++;163 164 if (cells == 0) {165 dev_err(&dev->dev, "All decode registers disabled.\n");166 return -ENODEV;167 }168 169 return mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);170}171 172static void lpc_sch_remove(struct pci_dev *dev)173{174 mfd_remove_devices(&dev->dev);175}176 177static struct pci_driver lpc_sch_driver = {178 .name = "lpc_sch",179 .id_table = lpc_sch_ids,180 .probe = lpc_sch_probe,181 .remove = lpc_sch_remove,182};183 184module_pci_driver(lpc_sch_driver);185 186MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");187MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");188MODULE_LICENSE("GPL");189