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[cor_2_6_31.git] / drivers / i2c / busses / i2c-piix4.c

/*
    Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
    Philip Edelbrock <phil@netroedge.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
   Supports:
        Intel PIIX4, 440MX
        Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
        ATI IXP200, IXP300, IXP400, SB600, SB700, SB800
        SMSC Victory66

   Note: we assume there can only be one device, with one SMBus interface.
*/

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <asm/io.h>


/* PIIX4 SMBus address offsets */
#define SMBHSTSTS       (0 + piix4_smba)
#define SMBHSLVSTS      (1 + piix4_smba)
#define SMBHSTCNT       (2 + piix4_smba)
#define SMBHSTCMD       (3 + piix4_smba)
#define SMBHSTADD       (4 + piix4_smba)
#define SMBHSTDAT0      (5 + piix4_smba)
#define SMBHSTDAT1      (6 + piix4_smba)
#define SMBBLKDAT       (7 + piix4_smba)
#define SMBSLVCNT       (8 + piix4_smba)
#define SMBSHDWCMD      (9 + piix4_smba)
#define SMBSLVEVT       (0xA + piix4_smba)
#define SMBSLVDAT       (0xC + piix4_smba)

/* count for request_region */
#define SMBIOSIZE       8

/* PCI Address Constants */
#define SMBBA           0x090
#define SMBHSTCFG       0x0D2
#define SMBSLVC         0x0D3
#define SMBSHDW1        0x0D4
#define SMBSHDW2        0x0D5
#define SMBREV          0x0D6

/* Other settings */
#define MAX_TIMEOUT     500
#define  ENABLE_INT9    0

/* PIIX4 constants */
#define PIIX4_QUICK             0x00
#define PIIX4_BYTE              0x04
#define PIIX4_BYTE_DATA         0x08
#define PIIX4_WORD_DATA         0x0C
#define PIIX4_BLOCK_DATA        0x14

/* insmod parameters */

/* If force is set to anything different from 0, we forcibly enable the
   PIIX4. DANGEROUS! */
static int force;
module_param (force, int, 0);
MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");

/* If force_addr is set to anything different from 0, we forcibly enable
   the PIIX4 at the given address. VERY DANGEROUS! */
static int force_addr;
module_param (force_addr, int, 0);
MODULE_PARM_DESC(force_addr,
                 "Forcibly enable the PIIX4 at the given address. "
                 "EXTREMELY DANGEROUS!");

static unsigned short piix4_smba;
static int srvrworks_csb5_delay;
static struct pci_driver piix4_driver;
static struct i2c_adapter piix4_adapter;

static struct dmi_system_id __devinitdata piix4_dmi_blacklist[] = {
        {
                .ident = "Sapphire AM2RD790",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
                        DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
                },
        },
        {
                .ident = "DFI Lanparty UT 790FX",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
                        DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
                },
        },
        { }
};

/* The IBM entry is in a separate table because we only check it
   on Intel-based systems */
static struct dmi_system_id __devinitdata piix4_dmi_ibm[] = {
        {
                .ident = "IBM",
                .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
        },
        { },
};

static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
                                const struct pci_device_id *id)
{
        unsigned char temp;

        if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
            (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
                srvrworks_csb5_delay = 1;

        /* On some motherboards, it was reported that accessing the SMBus
           caused severe hardware problems */
        if (dmi_check_system(piix4_dmi_blacklist)) {
                dev_err(&PIIX4_dev->dev,
                        "Accessing the SMBus on this system is unsafe!\n");
                return -EPERM;
        }

        /* Don't access SMBus on IBM systems which get corrupted eeproms */
        if (dmi_check_system(piix4_dmi_ibm) &&
                        PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
                dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
                        "may corrupt your serial eeprom! Refusing to load "
                        "module!\n");
                return -EPERM;
        }

        /* Determine the address of the SMBus areas */
        if (force_addr) {
                piix4_smba = force_addr & 0xfff0;
                force = 0;
        } else {
                pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
                piix4_smba &= 0xfff0;
                if(piix4_smba == 0) {
                        dev_err(&PIIX4_dev->dev, "SMBus base address "
                                "uninitialized - upgrade BIOS or use "
                                "force_addr=0xaddr\n");
                        return -ENODEV;
                }
        }

        if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
                return -EBUSY;

        if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
                dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
                        piix4_smba);
                return -EBUSY;
        }

        pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);

        /* If force_addr is set, we program the new address here. Just to make
           sure, we disable the PIIX4 first. */
        if (force_addr) {
                pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
                pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
                pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
                dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
                        "new address %04x!\n", piix4_smba);
        } else if ((temp & 1) == 0) {
                if (force) {
                        /* This should never need to be done, but has been
                         * noted that many Dell machines have the SMBus
                         * interface on the PIIX4 disabled!? NOTE: This assumes
                         * I/O space and other allocations WERE done by the
                         * Bios!  Don't complain if your hardware does weird
                         * things after enabling this. :') Check for Bios
                         * updates before resorting to this.
                         */
                        pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
                                              temp | 1);
                        dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
                                "WARNING: SMBus interface has been "
                                "FORCEFULLY ENABLED!\n");
                } else {
                        dev_err(&PIIX4_dev->dev,
                                "Host SMBus controller not enabled!\n");
                        release_region(piix4_smba, SMBIOSIZE);
                        piix4_smba = 0;
                        return -ENODEV;
                }
        }

        if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
                dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
        else if ((temp & 0x0E) == 0)
                dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
        else
                dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
                        "(or code out of date)!\n");

        pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
        dev_info(&PIIX4_dev->dev,
                 "SMBus Host Controller at 0x%x, revision %d\n",
                 piix4_smba, temp);

        return 0;
}

static int __devinit piix4_setup_sb800(struct pci_dev *PIIX4_dev,
                                const struct pci_device_id *id)
{
        unsigned short smba_idx = 0xcd6;
        u8 smba_en_lo, smba_en_hi, i2ccfg, i2ccfg_offset = 0x10, smb_en = 0x2c;

        /* SB800 SMBus does not support forcing address */
        if (force || force_addr) {
                dev_err(&PIIX4_dev->dev, "SB800 SMBus does not support "
                        "forcing address!\n");
                return -EINVAL;
        }

        /* Determine the address of the SMBus areas */
        if (!request_region(smba_idx, 2, "smba_idx")) {
                dev_err(&PIIX4_dev->dev, "SMBus base address index region "
                        "0x%x already in use!\n", smba_idx);
                return -EBUSY;
        }
        outb_p(smb_en, smba_idx);
        smba_en_lo = inb_p(smba_idx + 1);
        outb_p(smb_en + 1, smba_idx);
        smba_en_hi = inb_p(smba_idx + 1);
        release_region(smba_idx, 2);

        if ((smba_en_lo & 1) == 0) {
                dev_err(&PIIX4_dev->dev,
                        "Host SMBus controller not enabled!\n");
                return -ENODEV;
        }

        piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
        if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
                return -EBUSY;

        if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
                dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
                        piix4_smba);
                return -EBUSY;
        }

        /* Request the SMBus I2C bus config region */
        if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
                dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
                        "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
                release_region(piix4_smba, SMBIOSIZE);
                piix4_smba = 0;
                return -EBUSY;
        }
        i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
        release_region(piix4_smba + i2ccfg_offset, 1);

        if (i2ccfg & 1)
                dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus.\n");
        else
                dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus.\n");

        dev_info(&PIIX4_dev->dev,
                 "SMBus Host Controller at 0x%x, revision %d\n",
                 piix4_smba, i2ccfg >> 4);

        return 0;
}

static int piix4_transaction(void)
{
        int temp;
        int result = 0;
        int timeout = 0;

        dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
                "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
                inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
                inb_p(SMBHSTDAT1));

        /* Make sure the SMBus host is ready to start transmitting */
        if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
                dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
                        "Resetting...\n", temp);
                outb_p(temp, SMBHSTSTS);
                if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
                        dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
                        return -EBUSY;
                } else {
                        dev_dbg(&piix4_adapter.dev, "Successful!\n");
                }
        }

        /* start the transaction by setting bit 6 */
        outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);

        /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
        if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
                msleep(2);
        else
                msleep(1);

        while ((timeout++ < MAX_TIMEOUT) &&
               ((temp = inb_p(SMBHSTSTS)) & 0x01))
                msleep(1);

        /* If the SMBus is still busy, we give up */
        if (timeout >= MAX_TIMEOUT) {
                dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
                result = -ETIMEDOUT;
        }

        if (temp & 0x10) {
                result = -EIO;
                dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
        }

        if (temp & 0x08) {
                result = -EIO;
                dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
                        "locked until next hard reset. (sorry!)\n");
                /* Clock stops and slave is stuck in mid-transmission */
        }

        if (temp & 0x04) {
                result = -ENXIO;
                dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
        }

        if (inb_p(SMBHSTSTS) != 0x00)
                outb_p(inb(SMBHSTSTS), SMBHSTSTS);

        if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
                dev_err(&piix4_adapter.dev, "Failed reset at end of "
                        "transaction (%02x)\n", temp);
        }
        dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
                "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
                inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
                inb_p(SMBHSTDAT1));
        return result;
}

/* Return negative errno on error. */
static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
                 unsigned short flags, char read_write,
                 u8 command, int size, union i2c_smbus_data * data)
{
        int i, len;
        int status;

        switch (size) {
        case I2C_SMBUS_QUICK:
                outb_p((addr << 1) | read_write,
                       SMBHSTADD);
                size = PIIX4_QUICK;
                break;
        case I2C_SMBUS_BYTE:
                outb_p((addr << 1) | read_write,
                       SMBHSTADD);
                if (read_write == I2C_SMBUS_WRITE)
                        outb_p(command, SMBHSTCMD);
                size = PIIX4_BYTE;
                break;
        case I2C_SMBUS_BYTE_DATA:
                outb_p((addr << 1) | read_write,
                       SMBHSTADD);
                outb_p(command, SMBHSTCMD);
                if (read_write == I2C_SMBUS_WRITE)
                        outb_p(data->byte, SMBHSTDAT0);
                size = PIIX4_BYTE_DATA;
                break;
        case I2C_SMBUS_WORD_DATA:
                outb_p((addr << 1) | read_write,
                       SMBHSTADD);
                outb_p(command, SMBHSTCMD);
                if (read_write == I2C_SMBUS_WRITE) {
                        outb_p(data->word & 0xff, SMBHSTDAT0);
                        outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
                }
                size = PIIX4_WORD_DATA;
                break;
        case I2C_SMBUS_BLOCK_DATA:
                outb_p((addr << 1) | read_write,
                       SMBHSTADD);
                outb_p(command, SMBHSTCMD);
                if (read_write == I2C_SMBUS_WRITE) {
                        len = data->block[0];
                        if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
                                return -EINVAL;
                        outb_p(len, SMBHSTDAT0);
                        i = inb_p(SMBHSTCNT);   /* Reset SMBBLKDAT */
                        for (i = 1; i <= len; i++)
                                outb_p(data->block[i], SMBBLKDAT);
                }
                size = PIIX4_BLOCK_DATA;
                break;
        default:
                dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
                return -EOPNOTSUPP;
        }

        outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);

        status = piix4_transaction();
        if (status)
                return status;

        if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
                return 0;


        switch (size) {
        case PIIX4_BYTE:
        case PIIX4_BYTE_DATA:
                data->byte = inb_p(SMBHSTDAT0);
                break;
        case PIIX4_WORD_DATA:
                data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
                break;
        case PIIX4_BLOCK_DATA:
                data->block[0] = inb_p(SMBHSTDAT0);
                if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
                        return -EPROTO;
                i = inb_p(SMBHSTCNT);   /* Reset SMBBLKDAT */
                for (i = 1; i <= data->block[0]; i++)
                        data->block[i] = inb_p(SMBBLKDAT);
                break;
        }
        return 0;
}

static u32 piix4_func(struct i2c_adapter *adapter)
{
        return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
            I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
            I2C_FUNC_SMBUS_BLOCK_DATA;
}

static const struct i2c_algorithm smbus_algorithm = {
        .smbus_xfer     = piix4_access,
        .functionality  = piix4_func,
};

static struct i2c_adapter piix4_adapter = {
        .owner          = THIS_MODULE,
        .class          = I2C_CLASS_HWMON | I2C_CLASS_SPD,
        .algo           = &smbus_algorithm,
};

static struct pci_device_id piix4_ids[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
        { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
        { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
        { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
        { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
        { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
        { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
                     PCI_DEVICE_ID_SERVERWORKS_OSB4) },
        { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
                     PCI_DEVICE_ID_SERVERWORKS_CSB5) },
        { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
                     PCI_DEVICE_ID_SERVERWORKS_CSB6) },
        { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
                     PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
        { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
                     PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
        { 0, }
};

MODULE_DEVICE_TABLE (pci, piix4_ids);

static int __devinit piix4_probe(struct pci_dev *dev,
                                const struct pci_device_id *id)
{
        int retval;

        if ((dev->vendor == PCI_VENDOR_ID_ATI) &&
            (dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) &&
            (dev->revision >= 0x40))
                /* base address location etc changed in SB800 */
                retval = piix4_setup_sb800(dev, id);
        else
                retval = piix4_setup(dev, id);

        if (retval)
                return retval;

        /* set up the sysfs linkage to our parent device */
        piix4_adapter.dev.parent = &dev->dev;

        snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
                "SMBus PIIX4 adapter at %04x", piix4_smba);

        if ((retval = i2c_add_adapter(&piix4_adapter))) {
                dev_err(&dev->dev, "Couldn't register adapter!\n");
                release_region(piix4_smba, SMBIOSIZE);
                piix4_smba = 0;
        }

        return retval;
}

static void __devexit piix4_remove(struct pci_dev *dev)
{
        if (piix4_smba) {
                i2c_del_adapter(&piix4_adapter);
                release_region(piix4_smba, SMBIOSIZE);
                piix4_smba = 0;
        }
}

static struct pci_driver piix4_driver = {
        .name           = "piix4_smbus",
        .id_table       = piix4_ids,
        .probe          = piix4_probe,
        .remove         = __devexit_p(piix4_remove),
};

static int __init i2c_piix4_init(void)
{
        return pci_register_driver(&piix4_driver);
}

static void __exit i2c_piix4_exit(void)
{
        pci_unregister_driver(&piix4_driver);
}

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
                "Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("PIIX4 SMBus driver");
MODULE_LICENSE("GPL");

module_init(i2c_piix4_init);
module_exit(i2c_piix4_exit);