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/*

    amd756.c - Part of lm_sensors, Linux kernel modules for hardware

              monitoring

    Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>

    Shamelessly ripped from i2c-piix4.c:

    Copyright (c) 1998, 1999  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.

*/

/*

    2002-04-08: Added nForce support. (Csaba Halasz)

    2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)

    2002-12-28: Rewritten into something that resembles a Linux driver (hch)

*/

/*

   Supports AMD756, AMD766, AMD768 and nVidia nForce

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

*/

/* #define DEBUG 1 */

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/kernel.h>

#include <linux/stddef.h>

#include <linux/sched.h>

#include <linux/ioport.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <asm/io.h>

/* AMD756 SMBus address offsets */

#define SMB_ADDR_OFFSET         0xE0

#define SMB_IOSIZE              16

#define SMB_GLOBAL_STATUS       (0x0 + amd756_ioport)

#define SMB_GLOBAL_ENABLE       (0x2 + amd756_ioport)

#define SMB_HOST_ADDRESS        (0x4 + amd756_ioport)

#define SMB_HOST_DATA           (0x6 + amd756_ioport)

#define SMB_HOST_COMMAND        (0x8 + amd756_ioport)

#define SMB_HOST_BLOCK_DATA     (0x9 + amd756_ioport)

#define SMB_HAS_DATA            (0xA + amd756_ioport)

#define SMB_HAS_DEVICE_ADDRESS  (0xC + amd756_ioport)

#define SMB_HAS_HOST_ADDRESS    (0xE + amd756_ioport)

#define SMB_SNOOP_ADDRESS       (0xF + amd756_ioport)

/* PCI Address Constants */

/* address of I/O space */

#define SMBBA           0x058           /* mh */

#define SMBBANFORCE     0x014

/* general configuration */

#define SMBGCFG         0x041           /* mh */

/* silicon revision code */

#define SMBREV          0x008

/* Other settings */

#define MAX_TIMEOUT     500

/* AMD756 constants */

#define AMD756_QUICK            0x00

#define AMD756_BYTE             0x01

#define AMD756_BYTE_DATA        0x02

#define AMD756_WORD_DATA        0x03

#define AMD756_PROCESS_CALL     0x04

#define AMD756_BLOCK_DATA       0x05

static unsigned short amd756_ioport = 0;

/*

  SMBUS event = I/O 28-29 bit 11

     see E0 for the status bits and enabled in E2

*/

#define GS_ABRT_STS     (1 << 0)

#define GS_COL_STS      (1 << 1)

#define GS_PRERR_STS    (1 << 2)

#define GS_HST_STS      (1 << 3)

#define GS_HCYC_STS     (1 << 4)

#define GS_TO_STS       (1 << 5)

#define GS_SMB_STS      (1 << 11)

#define GS_CLEAR_STS    (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \

                         GS_HCYC_STS | GS_TO_STS )

#define GE_CYC_TYPE_MASK        (7)

#define GE_HOST_STC             (1 << 3)

#define GE_ABORT                (1 << 5)

static int amd756_transaction(struct i2c_adapter *adap)

{

        int temp;

        int result = 0;

        int timeout = 0;

        dev_dbg(&adap->dev, ": Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "

                "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),

                inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),

                inb_p(SMB_HOST_DATA));

        /* Make sure the SMBus host is ready to start transmitting */

        if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {

                dev_dbg(&adap->dev, ": SMBus busy (%04x). Waiting... \n", temp);

                do {

                        i2c_delay(1);

                        temp = inw_p(SMB_GLOBAL_STATUS);

                } while ((temp & (GS_HST_STS | GS_SMB_STS)) &&

                         (timeout++ < MAX_TIMEOUT));

                /* If the SMBus is still busy, we give up */

                if (timeout >= MAX_TIMEOUT) {

                        dev_dbg(&adap->dev, ": Busy wait timeout (%04x)\n", temp);

                        goto abort;

                }

                timeout = 0;

        }

        /* start the transaction by setting the start bit */

        outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);

        /* We will always wait for a fraction of a second! */

        do {

                i2c_delay(1);

                temp = inw_p(SMB_GLOBAL_STATUS);

        } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));

        /* If the SMBus is still busy, we give up */

        if (timeout >= MAX_TIMEOUT) {

                dev_dbg(&adap->dev, ": Completion timeout!\n");

                goto abort;

        }

        if (temp & GS_PRERR_STS) {

                result = -1;

                dev_dbg(&adap->dev, ": SMBus Protocol error (no response)!\n");

        }

        if (temp & GS_COL_STS) {

                result = -1;

                dev_warn(&adap->dev, " SMBus collision!\n");

        }

        if (temp & GS_TO_STS) {

                result = -1;

                dev_dbg(&adap->dev, ": SMBus protocol timeout!\n");

        }

        if (temp & GS_HCYC_STS)

                dev_dbg(&adap->dev, " SMBus protocol success!\n");

        outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);

#ifdef DEBUG

        if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {

                dev_dbg(&adap->dev,

                        ": Failed reset at end of transaction (%04x)\n", temp);

        }

#endif

        dev_dbg(&adap->dev,

                ": Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",

                inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),

                inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));

        return result;

 abort:

        dev_warn(&adap->dev, ": Sending abort.\n");

        outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);

        i2c_delay(100);

        outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);

        return -1;

}

/* Return -1 on error. */

static s32 amd756_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;

        /** TODO: Should I supporte the 10-bit transfers? */

        switch (size) {

        case I2C_SMBUS_PROC_CALL:

                dev_dbg(&adap->dev, ": I2C_SMBUS_PROC_CALL not supported!\n");

                /* TODO: Well... It is supported, I'm just not sure what to do here... */

                return -1;

        case I2C_SMBUS_QUICK:

                outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),

                       SMB_HOST_ADDRESS);

                size = AMD756_QUICK;

                break;

        case I2C_SMBUS_BYTE:

                outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),

                       SMB_HOST_ADDRESS);

                /* TODO: Why only during write? */

                if (read_write == I2C_SMBUS_WRITE)

                        outb_p(command, SMB_HOST_COMMAND);

                size = AMD756_BYTE;

                break;

        case I2C_SMBUS_BYTE_DATA:

                outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),

                       SMB_HOST_ADDRESS);

                outb_p(command, SMB_HOST_COMMAND);

                if (read_write == I2C_SMBUS_WRITE)

                        outw_p(data->byte, SMB_HOST_DATA);

                size = AMD756_BYTE_DATA;

                break;

        case I2C_SMBUS_WORD_DATA:

                outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),

                       SMB_HOST_ADDRESS);

                outb_p(command, SMB_HOST_COMMAND);

                if (read_write == I2C_SMBUS_WRITE)

                        outw_p(data->word, SMB_HOST_DATA);      /* TODO: endian???? */

                size = AMD756_WORD_DATA;

                break;

        case I2C_SMBUS_BLOCK_DATA:

                outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),

                       SMB_HOST_ADDRESS);

                outb_p(command, SMB_HOST_COMMAND);

                if (read_write == I2C_SMBUS_WRITE) {

                        len = data->block[0];

                        if (len < 0)

                                len = 0;

                        if (len > 32)

                                len = 32;

                        outw_p(len, SMB_HOST_DATA);

                        /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */

                        for (i = 1; i <= len; i++)

                                outb_p(data->block[i],

                                       SMB_HOST_BLOCK_DATA);

                }

                size = AMD756_BLOCK_DATA;

                break;

        }

        /* How about enabling interrupts... */

        outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);

        if (amd756_transaction(adap))   /* Error in transaction */

                return -1;

        if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))

                return 0;

        switch (size) {

        case AMD756_BYTE:

                data->byte = inw_p(SMB_HOST_DATA);

                break;

        case AMD756_BYTE_DATA:

                data->byte = inw_p(SMB_HOST_DATA);

                break;

        case AMD756_WORD_DATA:

                data->word = inw_p(SMB_HOST_DATA);      /* TODO: endian???? */

                break;

        case AMD756_BLOCK_DATA:

                data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;

                if(data->block[0] > 32)

                        data->block[0] = 32;

                /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */

                for (i = 1; i <= data->block[0]; i++)

                        data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);

                break;

        }

        return 0;

}

static u32 amd756_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 | I2C_FUNC_SMBUS_PROC_CALL;

}

static struct i2c_algorithm smbus_algorithm = {

        .name           = "Non-I2C SMBus adapter",

        .id             = I2C_ALGO_SMBUS,

        .smbus_xfer     = amd756_access,

        .functionality  = amd756_func,

};

static struct i2c_adapter amd756_adapter = {

        .owner          = THIS_MODULE,

        .class          = I2C_ADAP_CLASS_SMBUS,

        .algo           = &smbus_algorithm,

        .name           = "unset",

};

enum chiptype { AMD756, AMD766, AMD768, NFORCE };

static struct pci_device_id amd756_ids[] = {

        {PCI_VENDOR_ID_AMD, 0x740B, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD756 },

        {PCI_VENDOR_ID_AMD, 0x7413, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD766 },

        {PCI_VENDOR_ID_AMD, 0x7443, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD768 },

        {PCI_VENDOR_ID_NVIDIA, 0x01B4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, NFORCE },

        { 0, }

};

static int __devinit amd756_probe(struct pci_dev *pdev,

                                  const struct pci_device_id *id)

{

        int nforce = (id->driver_data == NFORCE), error;

        u8 temp;

        if (amd756_ioport) {

                dev_err(&pdev->dev, ": Only one device supported. "

                       "(you have a strange motherboard, btw..)\n");

                return -ENODEV;

        }

        if (nforce) {

                if (PCI_FUNC(pdev->devfn) != 1)

                        return -ENODEV;

                pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);

                amd756_ioport &= 0xfffc;

        } else { /* amd */

                if (PCI_FUNC(pdev->devfn) != 3)

                        return -ENODEV;

                pci_read_config_byte(pdev, SMBGCFG, &temp);

                if ((temp & 128) == 0) {

                        dev_err(&pdev->dev,

                                ": Error: SMBus controller I/O not enabled!\n");

                        return -ENODEV;

                }

                /* Determine the address of the SMBus areas */

                /* Technically it is a dword but... */

                pci_read_config_word(pdev, SMBBA, &amd756_ioport);

                amd756_ioport &= 0xff00;

                amd756_ioport += SMB_ADDR_OFFSET;

        }

        if (!request_region(amd756_ioport, SMB_IOSIZE, "amd756-smbus")) {

                dev_err(&pdev->dev, ": SMB region 0x%x already in use!\n",

                        amd756_ioport);

                return -ENODEV;

        }

        pci_read_config_byte(pdev, SMBREV, &temp);

        dev_dbg(&pdev->dev, ": SMBREV = 0x%X\n", temp);

        dev_dbg(&pdev->dev, ": AMD756_smba = 0x%X\n", amd756_ioport);

        /* set up the driverfs linkage to our parent device */

        amd756_adapter.dev.parent = &pdev->dev;

        snprintf(amd756_adapter.name, I2C_NAME_SIZE,

                "SMBus AMD75x adapter at %04x", amd756_ioport);

        error = i2c_add_adapter(&amd756_adapter);

        if (error) {

                dev_err(&pdev->dev,

                        ": Adapter registration failed, module not inserted.\n");

                goto out_err;

        }

        return 0;

 out_err:

        release_region(amd756_ioport, SMB_IOSIZE);

        return error;

}

static void __devexit amd756_remove(struct pci_dev *dev)

{

        i2c_del_adapter(&amd756_adapter);

        release_region(amd756_ioport, SMB_IOSIZE);

}

static struct pci_driver amd756_driver = {

        .name           = "amd75x smbus",

        .id_table       = amd756_ids,

        .probe          = amd756_probe,

        .remove         = __devexit_p(amd756_remove),

};

static int __init amd756_init(void)

{

        return pci_module_init(&amd756_driver);

}

static void __exit amd756_exit(void)

{

        pci_unregister_driver(&amd756_driver);

}

MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");

MODULE_DESCRIPTION("AMD756/766/768/nVidia nForce SMBus driver");

MODULE_LICENSE("GPL");

module_init(amd756_init)

module_exit(amd756_exit)