LXR linux/drivers/mfd/lpc

   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
  40static struct resource smbus_sch_resource = {
  41                .flags = IORESOURCE_IO,
  42};
  43
  44
  45static struct resource gpio_sch_resource = {
  46                .flags = IORESOURCE_IO,
  47};
  48
  49static 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
  62static struct pci_device_id lpc_sch_ids[] = {
  63        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
  64        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
  65        { 0, }
  66};
  67MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
  68
  69static int __devinit lpc_sch_probe(struct pci_dev *dev,
  70                                const struct pci_device_id *id)
  71{
  72        unsigned int base_addr_cfg;
  73        unsigned short base_addr;
  74        int i;
  75
  76        pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
  77        if (!(base_addr_cfg & (1 << 31))) {
  78                dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
  79                return -ENODEV;
  80        }
  81        base_addr = (unsigned short)base_addr_cfg;
  82        if (base_addr == 0) {
  83                dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
  84                return -ENODEV;
  85        }
  86
  87        smbus_sch_resource.start = base_addr;
  88        smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;
  89
  90        pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
  91        if (!(base_addr_cfg & (1 << 31))) {
  92                dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
  93                return -ENODEV;
  94        }
  95        base_addr = (unsigned short)base_addr_cfg;
  96        if (base_addr == 0) {
  97                dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
  98                return -ENODEV;
  99        }
 100
 101        gpio_sch_resource.start = base_addr;
 102        gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;
 103
 104        for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
 105                lpc_sch_cells[i].id = id->device;
 106
 107        return mfd_add_devices(&dev->dev, 0,
 108                        lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL, 0);
 109}
 110
 111static void __devexit lpc_sch_remove(struct pci_dev *dev)
 112{
 113        mfd_remove_devices(&dev->dev);
 114}
 115
 116static struct pci_driver lpc_sch_driver = {
 117        .name           = "lpc_sch",
 118        .id_table       = lpc_sch_ids,
 119        .probe          = lpc_sch_probe,
 120        .remove         = __devexit_p(lpc_sch_remove),
 121};
 122
 123static int __init lpc_sch_init(void)
 124{
 125        return pci_register_driver(&lpc_sch_driver);
 126}
 127
 128static void __exit lpc_sch_exit(void)
 129{
 130        pci_unregister_driver(&lpc_sch_driver);
 131}
 132
 133module_init(lpc_sch_init);
 134module_exit(lpc_sch_exit);
 135
 136MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
 137MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
 138MODULE_LICENSE("GPL");
 139