lpc_sch.c

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/*
 *  lpc_sch.c - LPC interface for Intel Poulsbo SCH
 *
 *  LPC bridge function of the Intel SCH contains many other
 *  functional units, such as Interrupt controllers, Timers,
 *  Power Management, System Management, GPIO, RTC, and LPC
 *  Configuration Registers.
 *
 *  Copyright (c) 2010 CompuLab Ltd
 *  Author: Denis Turischev <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License 2 as published
 *  by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/mfd/core.h>

#define SMBASE      0x40
#define SMBUS_IO_SIZE   64

#define GPIOBASE    0x44
#define GPIO_IO_SIZE    64
#define GPIO_IO_SIZE_CENTERTON  128

#define WDTBASE     0x84
#define WDT_IO_SIZE 64

static struct resource smbus_sch_resource = {
        .flags = IORESOURCE_IO,
};


static struct resource gpio_sch_resource = {
        .flags = IORESOURCE_IO,
};

static struct mfd_cell lpc_sch_cells[] = {
    {
        .name = "isch_smbus",
        .num_resources = 1,
        .resources = &smbus_sch_resource,
    },
    {
        .name = "sch_gpio",
        .num_resources = 1,
        .resources = &gpio_sch_resource,
    },
};

static struct resource wdt_sch_resource = {
        .flags = IORESOURCE_IO,
};

static struct mfd_cell tunnelcreek_cells[] = {
    {
        .name = "ie6xx_wdt",
        .num_resources = 1,
        .resources = &wdt_sch_resource,
    },
};

static DEFINE_PCI_DEVICE_TABLE(lpc_sch_ids) = {
    { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SCH_LPC) },
    { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ITC_LPC) },
    { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CENTERTON_ILB) },
    { 0, }
};
MODULE_DEVICE_TABLE(pci, lpc_sch_ids);

static int __devinit lpc_sch_probe(struct pci_dev *dev,
                const struct pci_device_id *id)
{
    unsigned int base_addr_cfg;
    unsigned short base_addr;
    int i;
    int ret;

    pci_read_config_dword(dev, SMBASE, &base_addr_cfg);
    if (!(base_addr_cfg & (1 << 31))) {
        dev_err(&dev->dev, "Decode of the SMBus I/O range disabled\n");
        return -ENODEV;
    }
    base_addr = (unsigned short)base_addr_cfg;
    if (base_addr == 0) {
        dev_err(&dev->dev, "I/O space for SMBus uninitialized\n");
        return -ENODEV;
    }

    smbus_sch_resource.start = base_addr;
    smbus_sch_resource.end = base_addr + SMBUS_IO_SIZE - 1;

    pci_read_config_dword(dev, GPIOBASE, &base_addr_cfg);
    if (!(base_addr_cfg & (1 << 31))) {
        dev_err(&dev->dev, "Decode of the GPIO I/O range disabled\n");
        return -ENODEV;
    }
    base_addr = (unsigned short)base_addr_cfg;
    if (base_addr == 0) {
        dev_err(&dev->dev, "I/O space for GPIO uninitialized\n");
        return -ENODEV;
    }

    gpio_sch_resource.start = base_addr;

    if (id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB)
        gpio_sch_resource.end = base_addr + GPIO_IO_SIZE_CENTERTON - 1;
    else
        gpio_sch_resource.end = base_addr + GPIO_IO_SIZE - 1;

    for (i=0; i < ARRAY_SIZE(lpc_sch_cells); i++)
        lpc_sch_cells[i].id = id->device;

    ret = mfd_add_devices(&dev->dev, 0,
                  lpc_sch_cells, ARRAY_SIZE(lpc_sch_cells), NULL,
                  0, NULL);
    if (ret)
        goto out_dev;

    if (id->device == PCI_DEVICE_ID_INTEL_ITC_LPC
     || id->device == PCI_DEVICE_ID_INTEL_CENTERTON_ILB) {
        pci_read_config_dword(dev, WDTBASE, &base_addr_cfg);
        if (!(base_addr_cfg & (1 << 31))) {
            dev_err(&dev->dev, "Decode of the WDT I/O range disabled\n");
            ret = -ENODEV;
            goto out_dev;
        }
        base_addr = (unsigned short)base_addr_cfg;
        if (base_addr == 0) {
            dev_err(&dev->dev, "I/O space for WDT uninitialized\n");
            ret = -ENODEV;
            goto out_dev;
        }

        wdt_sch_resource.start = base_addr;
        wdt_sch_resource.end = base_addr + WDT_IO_SIZE - 1;

        for (i = 0; i < ARRAY_SIZE(tunnelcreek_cells); i++)
            tunnelcreek_cells[i].id = id->device;

        ret = mfd_add_devices(&dev->dev, 0, tunnelcreek_cells,
                      ARRAY_SIZE(tunnelcreek_cells), NULL,
                      0, NULL);
    }

    return ret;
out_dev:
    mfd_remove_devices(&dev->dev);
    return ret;
}

static void __devexit lpc_sch_remove(struct pci_dev *dev)
{
    mfd_remove_devices(&dev->dev);
}

static struct pci_driver lpc_sch_driver = {
    .name       = "lpc_sch",
    .id_table   = lpc_sch_ids,
    .probe      = lpc_sch_probe,
    .remove     = __devexit_p(lpc_sch_remove),
};

module_pci_driver(lpc_sch_driver);

MODULE_AUTHOR("Denis Turischev <[email protected]>");
MODULE_DESCRIPTION("LPC interface for Intel Poulsbo SCH");
MODULE_LICENSE("GPL");