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