linux/drivers/mfd/lpc_sch.c
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   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
  44static struct resource smbus_sch_resource = {
  45                .flags = IORESOURCE_IO,
  46};
  47
  48
  49static struct resource gpio_sch_resource = {
  50                .flags = IORESOURCE_IO,
  51};
  52
  53static 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
  66static struct resource wdt_sch_resource = {
  67                .flags = IORESOURCE_IO,
  68};
  69
  70static struct mfd_cell tunnelcreek_cells[] = {
  71        {
  72                .name = "ie6xx_wdt",
  73                .num_resources = 1,
  74                .resources = &wdt_sch_resource,
  75        },
  76};
  77
  78static 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};
  84MODULE_DEVICE_TABLE(pci, lpc_sch_ids);
  85
  86static int __devinit 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;
 162out_dev:
 163        mfd_remove_devices(&dev->dev);
 164        return ret;
 165}
 166
 167static void __devexit lpc_sch_remove(struct pci_dev *dev)
 168{
 169        mfd_remove_devices(&dev->dev);
 170}
 171
 172static struct pci_driver lpc_sch_driver = {
 173        .name           = "lpc_sch",
 174        .id_table       = lpc_sch_ids,
 175        .probe          = lpc_sch_probe,
 176        .remove         = __devexit_p(lpc_sch_remove),
 177};
 178
 179module_pci_driver(lpc_sch_driver);
 180
 181MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
 182MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
 183MODULE_LICENSE("GPL");
 184
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