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  *  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 #define GPIO_IO_SIZE_CENTERTON  128
  40
  41 #define WDTBASE         0x84
  42 #define WDT_IO_SIZE     64
  43
  44 static struct resource smbus_sch_resource = {
  45                 .flags = IORESOURCE_IO,
  46 };
  47
  48 static struct resource gpio_sch_resource = {
  49                 .flags = IORESOURCE_IO,
  50 };
  51
  52 static struct resource wdt_sch_resource = {
  53                 .flags = IORESOURCE_IO,
  54 };
  55
  56 static struct mfd_cell lpc_sch_cells[3];
  57
  58 static struct mfd_cell isch_smbus_cell = {
  59         .name = "isch_smbus",
  60         .num_resources = 1,
  61         .resources = &smbus_sch_resource,
  62         .ignore_resource_conflicts = true,
  63 };
  64
  65 static struct mfd_cell sch_gpio_cell = {
  66         .name = "sch_gpio",
  67         .num_resources = 1,
  68         .resources = &gpio_sch_resource,
  69         .ignore_resource_conflicts = true,
  70 };
  71
  72 static struct mfd_cell wdt_sch_cell = {
  73         .name = "ie6xx_wdt",
  74         .num_resources = 1,
  75         .resources = &wdt_sch_resource,
  76         .ignore_resource_conflicts = true,
  77 };
  78
  79 static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
  80         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
  81         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
  82         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB) },
  83         { 0, }
  84 };
  85 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
  86
  87 static int lpc_sch_probe(struct pci_dev *dev,
  88                                 const struct pci_device_id *id)
  89 {
  90         unsigned int base_addr_cfg;
  91         unsigned short base_addr;
  92         int i, cells = 0;
  93         int ret;
  94
  95         pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
  96         base_addr = 0;
  97         if (!(base_addr_cfg & (1 << 31)))
  98                 dev_warn(&dev->dev, "Decode of the SMBus I/O range disabled\n");
  99         else
 100                 base_addr = (unsigned short)base_addr_cfg;
 101
 102         if (base_addr == 0) {
 103                 dev_warn(&dev->dev, "I/O space for SMBus uninitialized\n");
 104         } else {
 105                 lpc_sch_cells[cells++] = isch_smbus_cell;
 106                 smbus_sch_resource.start = base_addr;
 107                 smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
 108         }
 109
 110         pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
 111         base_addr = 0;
 112         if (!(base_addr_cfg & (1 << 31)))
 113                 dev_warn(&dev->dev, "Decode of the GPIO I/O range disabled\n");
 114         else
 115                 base_addr = (unsigned short)base_addr_cfg;
 116
 117         if (base_addr == 0) {
 118                 dev_warn(&dev->dev, "I/O space for GPIO uninitialized\n");
 119         } else {
 120                 lpc_sch_cells[cells++] = sch_gpio_cell;
 121                 gpio_sch_resource.start = base_addr;
 122                 if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
 123                         gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
 124                 else
 125                         gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
 126         }
 127
 128         if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
 129             || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
 130                 pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
 131                 base_addr = 0;
 132                 if (!(base_addr_cfg & (1 << 31)))
 133                         dev_warn(&dev->dev, "Decode of the WDT I/O range disabled\n");
 134                 else
 135                         base_addr = (unsigned short)base_addr_cfg;
 136                 if (base_addr == 0)
 137                         dev_warn(&dev->dev, "I/O space for WDT uninitialized\n");
 138                 else {
 139                         lpc_sch_cells[cells++] = wdt_sch_cell;
 140                         wdt_sch_resource.start = base_addr;
 141                         wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;
 142                 }
 143         }
 144
 145         if (WARN_ON(cells > ARRAY_SIZE(lpc_sch_cells))) {
 146                 dev_err(&dev->dev, "Cell count exceeds array size");
 147                 return -ENODEV;
 148         }
 149
 150         if (cells == 0) {
 151                 dev_err(&dev->dev, "All decode registers disabled.\n");
 152                 return -ENODEV;
 153         }
 154
 155         for (i = 0; i < cells; i++)
 156                 lpc_sch_cells[i].id = id->device;
 157
 158         ret = mfd_add_devices(&dev->dev, 0, lpc_sch_cells, cells, NULL, 0, NULL);
 159         if (ret)
 160                 mfd_remove_devices(&dev->dev);
 161
 162         return ret;
 163 }
 164
 165 static void lpc_sch_remove(struct pci_dev *dev)
 166 {
 167         mfd_remove_devices(&dev->dev);
 168 }
 169
 170 static struct pci_driver lpc_sch_driver = {
 171         .name           = "lpc_sch",
 172         .id_table       = lpc_sch_ids,
 173         .probe          = lpc_sch_probe,
 174         .remove         = lpc_sch_remove,
 175 };
 176
 177 module_pci_driver(lpc_sch_driver);
 178
 179 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
 180 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
 181 MODULE_LICENSE("GPL");