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
  40 static struct resource smbus_sch_resource = {
  41                 .flags = IORESOURCE_IO,
  42 };
  43
  44
  45 static struct resource gpio_sch_resource = {
  46                 .flags = IORESOURCE_IO,
  47 };
  48
  49 static struct mfd_cell lpc_sch_cells[] = {
  50         {
  51                 .name = "isch_smbus",
  52                 .num_resources = 1,
  53                 .resources = &smbus_sch_resource,
  54         },
  55         {
  56                 .name = "sch_gpio",
  57                 .num_resources = 1,
  58                 .resources = &gpio_sch_resource,
  59         },
  60 };
  61
  62 static struct pci_device_id lpc_sch_ids[] = {
  63         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
  64         { 0, }
  65 };
  66 MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
  67
  68 static int __devinit lpc_sch_probe(struct pci_dev *dev,
  69                                 const struct pci_device_id *id)
  70 {
  71         unsigned int base_addr_cfg;
  72         unsigned short base_addr;
  73
  74         pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
  75         if (!(base_addr_cfg & (1 << 31))) {
  76                 dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
  77                 return -ENODEV;
  78         }
  79         base_addr = (unsigned short)base_addr_cfg;
  80         if (base_addr == 0) {
  81                 dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
  82                 return -ENODEV;
  83         }
  84
  85         smbus_sch_resource.start = base_addr;
  86         smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
  87
  88         pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
  89         if (!(base_addr_cfg & (1 << 31))) {
  90                 dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
  91                 return -ENODEV;
  92         }
  93         base_addr = (unsigned short)base_addr_cfg;
  94         if (base_addr == 0) {
  95                 dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
  96                 return -ENODEV;
  97         }
  98
  99         gpio_sch_resource.start = base_addr;
 100         gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
 101
 102         return mfd_add_devices(&dev->dev, -1,
 103                         lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
 104 }
 105
 106 static void __devexit lpc_sch_remove(struct pci_dev *dev)
 107 {
 108         mfd_remove_devices(&dev->dev);
 109 }
 110
 111 static struct pci_driver lpc_sch_driver = {
 112         .name           = "lpc_sch",
 113         .id_table       = lpc_sch_ids,
 114         .probe          = lpc_sch_probe,
 115         .remove         = __devexit_p(lpc_sch_remove),
 116 };
 117
 118 static int __init lpc_sch_init(void)
 119 {
 120         return pci_register_driver(&lpc_sch_driver);
 121 }
 122
 123 static void __exit lpc_sch_exit(void)
 124 {
 125         pci_unregister_driver(&lpc_sch_driver);
 126 }
 127
 128 module_init(lpc_sch_init);
 129 module_exit(lpc_sch_exit);
 130
 131 MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
 132 MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
 133 MODULE_LICENSE("GPL");