drivers/mfd/lpc_sch.c

   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         ret = mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
 197         if (ret)
 198                 mfd_remove_devices(&dev->dev);
 199
 200         return ret;
 201 }
 202
 203 static void lpc_sch_remove(struct pci_dev *dev)
 204 {
 205         mfd_remove_devices(&dev->dev);
 206 }
 207
 208 static struct pci_driver lpc_sch_driver = {
 209         .name           = "lpc_sch",
 210         .id_table       = lpc_sch_ids,
 211         .probe          = lpc_sch_probe,
 212         .remove         = lpc_sch_remove,
 213 };
 214
 215 module_pci_driver(lpc_sch_driver);
 216
 217 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
 218 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
 219 MODULE_LICENSE("GPL");