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