drivers/i2c/busses/i2c-piix4.c

   1 /*
   2     Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
   3     Philip Edelbrock <phil@netroedge.com>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14 */
  15
  16 /*
  17    Supports:
  18         Intel PIIX4, 440MX
  19         Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
  20         ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
  21         AMD Hudson-2, ML, CZ
  22         SMSC Victory66
  23
  24    Note: we assume there can only be one device, with one or more
  25    SMBus interfaces.
  26 */
  27
  28 #include <linux/module.h>
  29 #include <linux/moduleparam.h>
  30 #include <linux/pci.h>
  31 #include <linux/kernel.h>
  32 #include <linux/delay.h>
  33 #include <linux/stddef.h>
  34 #include <linux/ioport.h>
  35 #include <linux/i2c.h>
  36 #include <linux/slab.h>
  37 #include <linux/dmi.h>
  38 #include <linux/acpi.h>
  39 #include <linux/io.h>
  40
  41
  42 /* PIIX4 SMBus address offsets */
  43 #define SMBHSTSTS       (0 + piix4_smba)
  44 #define SMBHSLVSTS      (1 + piix4_smba)
  45 #define SMBHSTCNT       (2 + piix4_smba)
  46 #define SMBHSTCMD       (3 + piix4_smba)
  47 #define SMBHSTADD       (4 + piix4_smba)
  48 #define SMBHSTDAT0      (5 + piix4_smba)
  49 #define SMBHSTDAT1      (6 + piix4_smba)
  50 #define SMBBLKDAT       (7 + piix4_smba)
  51 #define SMBSLVCNT       (8 + piix4_smba)
  52 #define SMBSHDWCMD      (9 + piix4_smba)
  53 #define SMBSLVEVT       (0xA + piix4_smba)
  54 #define SMBSLVDAT       (0xC + piix4_smba)
  55
  56 /* count for request_region */
  57 #define SMBIOSIZE       8
  58
  59 /* PCI Address Constants */
  60 #define SMBBA           0x090
  61 #define SMBHSTCFG       0x0D2
  62 #define SMBSLVC         0x0D3
  63 #define SMBSHDW1        0x0D4
  64 #define SMBSHDW2        0x0D5
  65 #define SMBREV          0x0D6
  66
  67 /* Other settings */
  68 #define MAX_TIMEOUT     500
  69 #define  ENABLE_INT9    0
  70
  71 /* PIIX4 constants */
  72 #define PIIX4_QUICK             0x00
  73 #define PIIX4_BYTE              0x04
  74 #define PIIX4_BYTE_DATA         0x08
  75 #define PIIX4_WORD_DATA         0x0C
  76 #define PIIX4_BLOCK_DATA        0x14
  77
  78 /* insmod parameters */
  79
  80 /* If force is set to anything different from 0, we forcibly enable the
  81    PIIX4. DANGEROUS! */
  82 static int force;
  83 module_param (force, int, 0);
  84 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
  85
  86 /* If force_addr is set to anything different from 0, we forcibly enable
  87    the PIIX4 at the given address. VERY DANGEROUS! */
  88 static int force_addr;
  89 module_param (force_addr, int, 0);
  90 MODULE_PARM_DESC(force_addr,
  91                  "Forcibly enable the PIIX4 at the given address. "
  92                  "EXTREMELY DANGEROUS!");
  93
  94 static int srvrworks_csb5_delay;
  95 static struct pci_driver piix4_driver;
  96
  97 static const struct dmi_system_id piix4_dmi_blacklist[] = {
  98         {
  99                 .ident = "Sapphire AM2RD790",
 100                 .matches = {
 101                         DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
 102                         DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
 103                 },
 104         },
 105         {
 106                 .ident = "DFI Lanparty UT 790FX",
 107                 .matches = {
 108                         DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
 109                         DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
 110                 },
 111         },
 112         { }
 113 };
 114
 115 /* The IBM entry is in a separate table because we only check it
 116    on Intel-based systems */
 117 static const struct dmi_system_id piix4_dmi_ibm[] = {
 118         {
 119                 .ident = "IBM",
 120                 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
 121         },
 122         { },
 123 };
 124
 125 struct i2c_piix4_adapdata {
 126         unsigned short smba;
 127 };
 128
 129 static int piix4_setup(struct pci_dev *PIIX4_dev,
 130                        const struct pci_device_id *id)
 131 {
 132         unsigned char temp;
 133         unsigned short piix4_smba;
 134
 135         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
 136             (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
 137                 srvrworks_csb5_delay = 1;
 138
 139         /* On some motherboards, it was reported that accessing the SMBus
 140            caused severe hardware problems */
 141         if (dmi_check_system(piix4_dmi_blacklist)) {
 142                 dev_err(&PIIX4_dev->dev,
 143                         "Accessing the SMBus on this system is unsafe!\n");
 144                 return -EPERM;
 145         }
 146
 147         /* Don't access SMBus on IBM systems which get corrupted eeproms */
 148         if (dmi_check_system(piix4_dmi_ibm) &&
 149                         PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
 150                 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
 151                         "may corrupt your serial eeprom! Refusing to load "
 152                         "module!\n");
 153                 return -EPERM;
 154         }
 155
 156         /* Determine the address of the SMBus areas */
 157         if (force_addr) {
 158                 piix4_smba = force_addr & 0xfff0;
 159                 force = 0;
 160         } else {
 161                 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
 162                 piix4_smba &= 0xfff0;
 163                 if(piix4_smba == 0) {
 164                         dev_err(&PIIX4_dev->dev, "SMBus base address "
 165                                 "uninitialized - upgrade BIOS or use "
 166                                 "force_addr=0xaddr\n");
 167                         return -ENODEV;
 168                 }
 169         }
 170
 171         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 172                 return -ENODEV;
 173
 174         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 175                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
 176                         piix4_smba);
 177                 return -EBUSY;
 178         }
 179
 180         pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
 181
 182         /* If force_addr is set, we program the new address here. Just to make
 183            sure, we disable the PIIX4 first. */
 184         if (force_addr) {
 185                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
 186                 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
 187                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
 188                 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
 189                         "new address %04x!\n", piix4_smba);
 190         } else if ((temp & 1) == 0) {
 191                 if (force) {
 192                         /* This should never need to be done, but has been
 193                          * noted that many Dell machines have the SMBus
 194                          * interface on the PIIX4 disabled!? NOTE: This assumes
 195                          * I/O space and other allocations WERE done by the
 196                          * Bios!  Don't complain if your hardware does weird
 197                          * things after enabling this. :') Check for Bios
 198                          * updates before resorting to this.
 199                          */
 200                         pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
 201                                               temp | 1);
 202                         dev_notice(&PIIX4_dev->dev,
 203                                    "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
 204                 } else {
 205                         dev_err(&PIIX4_dev->dev,
 206                                 "SMBus Host Controller not enabled!\n");
 207                         release_region(piix4_smba, SMBIOSIZE);
 208                         return -ENODEV;
 209                 }
 210         }
 211
 212         if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
 213                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
 214         else if ((temp & 0x0E) == 0)
 215                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
 216         else
 217                 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
 218                         "(or code out of date)!\n");
 219
 220         pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
 221         dev_info(&PIIX4_dev->dev,
 222                  "SMBus Host Controller at 0x%x, revision %d\n",
 223                  piix4_smba, temp);
 224
 225         return piix4_smba;
 226 }
 227
 228 static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 229                              const struct pci_device_id *id, u8 aux)
 230 {
 231         unsigned short piix4_smba;
 232         unsigned short smba_idx = 0xcd6;
 233         u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status;
 234         u8 i2ccfg, i2ccfg_offset = 0x10;
 235
 236         /* SB800 and later SMBus does not support forcing address */
 237         if (force || force_addr) {
 238                 dev_err(&PIIX4_dev->dev, "SMBus does not support "
 239                         "forcing address!\n");
 240                 return -EINVAL;
 241         }
 242
 243         /* Determine the address of the SMBus areas */
 244         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
 245              PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
 246              PIIX4_dev->revision >= 0x41) ||
 247             (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
 248              PIIX4_dev->device == 0x790b &&
 249              PIIX4_dev->revision >= 0x49))
 250                 smb_en = 0x00;
 251         else
 252                 smb_en = (aux) ? 0x28 : 0x2c;
 253
 254         if (!request_region(smba_idx, 2, "smba_idx")) {
 255                 dev_err(&PIIX4_dev->dev, "SMBus base address index region "
 256                         "0x%x already in use!\n", smba_idx);
 257                 return -EBUSY;
 258         }
 259         outb_p(smb_en, smba_idx);
 260         smba_en_lo = inb_p(smba_idx + 1);
 261         outb_p(smb_en + 1, smba_idx);
 262         smba_en_hi = inb_p(smba_idx + 1);
 263         release_region(smba_idx, 2);
 264
 265         if (!smb_en) {
 266                 smb_en_status = smba_en_lo & 0x10;
 267                 piix4_smba = smba_en_hi << 8;
 268                 if (aux)
 269                         piix4_smba |= 0x20;
 270         } else {
 271                 smb_en_status = smba_en_lo & 0x01;
 272                 piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
 273         }
 274
 275         if (!smb_en_status) {
 276                 dev_err(&PIIX4_dev->dev,
 277                         "SMBus Host Controller not enabled!\n");
 278                 return -ENODEV;
 279         }
 280
 281         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 282                 return -ENODEV;
 283
 284         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 285                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
 286                         piix4_smba);
 287                 return -EBUSY;
 288         }
 289
 290         /* Aux SMBus does not support IRQ information */
 291         if (aux) {
 292                 dev_info(&PIIX4_dev->dev,
 293                          "Auxiliary SMBus Host Controller at 0x%x\n",
 294                          piix4_smba);
 295                 return piix4_smba;
 296         }
 297
 298         /* Request the SMBus I2C bus config region */
 299         if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
 300                 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
 301                         "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
 302                 release_region(piix4_smba, SMBIOSIZE);
 303                 return -EBUSY;
 304         }
 305         i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
 306         release_region(piix4_smba + i2ccfg_offset, 1);
 307
 308         if (i2ccfg & 1)
 309                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
 310         else
 311                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
 312
 313         dev_info(&PIIX4_dev->dev,
 314                  "SMBus Host Controller at 0x%x, revision %d\n",
 315                  piix4_smba, i2ccfg >> 4);
 316
 317         return piix4_smba;
 318 }
 319
 320 static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
 321                            const struct pci_device_id *id,
 322                            unsigned short base_reg_addr)
 323 {
 324         /* Set up auxiliary SMBus controllers found on some
 325          * AMD chipsets e.g. SP5100 (SB700 derivative) */
 326
 327         unsigned short piix4_smba;
 328
 329         /* Read address of auxiliary SMBus controller */
 330         pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
 331         if ((piix4_smba & 1) == 0) {
 332                 dev_dbg(&PIIX4_dev->dev,
 333                         "Auxiliary SMBus controller not enabled\n");
 334                 return -ENODEV;
 335         }
 336
 337         piix4_smba &= 0xfff0;
 338         if (piix4_smba == 0) {
 339                 dev_dbg(&PIIX4_dev->dev,
 340                         "Auxiliary SMBus base address uninitialized\n");
 341                 return -ENODEV;
 342         }
 343
 344         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 345                 return -ENODEV;
 346
 347         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 348                 dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
 349                         "already in use!\n", piix4_smba);
 350                 return -EBUSY;
 351         }
 352
 353         dev_info(&PIIX4_dev->dev,
 354                  "Auxiliary SMBus Host Controller at 0x%x\n",
 355                  piix4_smba);
 356
 357         return piix4_smba;
 358 }
 359
 360 static int piix4_transaction(struct i2c_adapter *piix4_adapter)
 361 {
 362         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
 363         unsigned short piix4_smba = adapdata->smba;
 364         int temp;
 365         int result = 0;
 366         int timeout = 0;
 367
 368         dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
 369                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
 370                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
 371                 inb_p(SMBHSTDAT1));
 372
 373         /* Make sure the SMBus host is ready to start transmitting */
 374         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 375                 dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
 376                         "Resetting...\n", temp);
 377                 outb_p(temp, SMBHSTSTS);
 378                 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 379                         dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
 380                         return -EBUSY;
 381                 } else {
 382                         dev_dbg(&piix4_adapter->dev, "Successful!\n");
 383                 }
 384         }
 385
 386         /* start the transaction by setting bit 6 */
 387         outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
 388
 389         /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
 390         if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
 391                 msleep(2);
 392         else
 393                 msleep(1);
 394
 395         while ((++timeout < MAX_TIMEOUT) &&
 396                ((temp = inb_p(SMBHSTSTS)) & 0x01))
 397                 msleep(1);
 398
 399         /* If the SMBus is still busy, we give up */
 400         if (timeout == MAX_TIMEOUT) {
 401                 dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
 402                 result = -ETIMEDOUT;
 403         }
 404
 405         if (temp & 0x10) {
 406                 result = -EIO;
 407                 dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
 408         }
 409
 410         if (temp & 0x08) {
 411                 result = -EIO;
 412                 dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
 413                         "locked until next hard reset. (sorry!)\n");
 414                 /* Clock stops and slave is stuck in mid-transmission */
 415         }
 416
 417         if (temp & 0x04) {
 418                 result = -ENXIO;
 419                 dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
 420         }
 421
 422         if (inb_p(SMBHSTSTS) != 0x00)
 423                 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
 424
 425         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 426                 dev_err(&piix4_adapter->dev, "Failed reset at end of "
 427                         "transaction (%02x)\n", temp);
 428         }
 429         dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
 430                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
 431                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
 432                 inb_p(SMBHSTDAT1));
 433         return result;
 434 }
 435
 436 /* Return negative errno on error. */
 437 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
 438                  unsigned short flags, char read_write,
 439                  u8 command, int size, union i2c_smbus_data * data)
 440 {
 441         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
 442         unsigned short piix4_smba = adapdata->smba;
 443         int i, len;
 444         int status;
 445
 446         switch (size) {
 447         case I2C_SMBUS_QUICK:
 448                 outb_p((addr << 1) | read_write,
 449                        SMBHSTADD);
 450                 size = PIIX4_QUICK;
 451                 break;
 452         case I2C_SMBUS_BYTE:
 453                 outb_p((addr << 1) | read_write,
 454                        SMBHSTADD);
 455                 if (read_write == I2C_SMBUS_WRITE)
 456                         outb_p(command, SMBHSTCMD);
 457                 size = PIIX4_BYTE;
 458                 break;
 459         case I2C_SMBUS_BYTE_DATA:
 460                 outb_p((addr << 1) | read_write,
 461                        SMBHSTADD);
 462                 outb_p(command, SMBHSTCMD);
 463                 if (read_write == I2C_SMBUS_WRITE)
 464                         outb_p(data->byte, SMBHSTDAT0);
 465                 size = PIIX4_BYTE_DATA;
 466                 break;
 467         case I2C_SMBUS_WORD_DATA:
 468                 outb_p((addr << 1) | read_write,
 469                        SMBHSTADD);
 470                 outb_p(command, SMBHSTCMD);
 471                 if (read_write == I2C_SMBUS_WRITE) {
 472                         outb_p(data->word & 0xff, SMBHSTDAT0);
 473                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
 474                 }
 475                 size = PIIX4_WORD_DATA;
 476                 break;
 477         case I2C_SMBUS_BLOCK_DATA:
 478                 outb_p((addr << 1) | read_write,
 479                        SMBHSTADD);
 480                 outb_p(command, SMBHSTCMD);
 481                 if (read_write == I2C_SMBUS_WRITE) {
 482                         len = data->block[0];
 483                         if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
 484                                 return -EINVAL;
 485                         outb_p(len, SMBHSTDAT0);
 486                         i = inb_p(SMBHSTCNT);   /* Reset SMBBLKDAT */
 487                         for (i = 1; i <= len; i++)
 488                                 outb_p(data->block[i], SMBBLKDAT);
 489                 }
 490                 size = PIIX4_BLOCK_DATA;
 491                 break;
 492         default:
 493                 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
 494                 return -EOPNOTSUPP;
 495         }
 496
 497         outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
 498
 499         status = piix4_transaction(adap);
 500         if (status)
 501                 return status;
 502
 503         if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
 504                 return 0;
 505
 506
 507         switch (size) {
 508         case PIIX4_BYTE:
 509         case PIIX4_BYTE_DATA:
 510                 data->byte = inb_p(SMBHSTDAT0);
 511                 break;
 512         case PIIX4_WORD_DATA:
 513                 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
 514                 break;
 515         case PIIX4_BLOCK_DATA:
 516                 data->block[0] = inb_p(SMBHSTDAT0);
 517                 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
 518                         return -EPROTO;
 519                 i = inb_p(SMBHSTCNT);   /* Reset SMBBLKDAT */
 520                 for (i = 1; i <= data->block[0]; i++)
 521                         data->block[i] = inb_p(SMBBLKDAT);
 522                 break;
 523         }
 524         return 0;
 525 }
 526
 527 static u32 piix4_func(struct i2c_adapter *adapter)
 528 {
 529         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 530             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 531             I2C_FUNC_SMBUS_BLOCK_DATA;
 532 }
 533
 534 static const struct i2c_algorithm smbus_algorithm = {
 535         .smbus_xfer     = piix4_access,
 536         .functionality  = piix4_func,
 537 };
 538
 539 static const struct pci_device_id piix4_ids[] = {
 540         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
 541         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
 542         { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
 543         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
 544         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
 545         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
 546         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
 547         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
 548         { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x790b) },
 549         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 550                      PCI_DEVICE_ID_SERVERWORKS_OSB4) },
 551         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 552                      PCI_DEVICE_ID_SERVERWORKS_CSB5) },
 553         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 554                      PCI_DEVICE_ID_SERVERWORKS_CSB6) },
 555         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 556                      PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
 557         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 558                      PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
 559         { 0, }
 560 };
 561
 562 MODULE_DEVICE_TABLE (pci, piix4_ids);
 563
 564 static struct i2c_adapter *piix4_main_adapter;
 565 static struct i2c_adapter *piix4_aux_adapter;
 566
 567 static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
 568                              struct i2c_adapter **padap)
 569 {
 570         struct i2c_adapter *adap;
 571         struct i2c_piix4_adapdata *adapdata;
 572         int retval;
 573
 574         adap = kzalloc(sizeof(*adap), GFP_KERNEL);
 575         if (adap == NULL) {
 576                 release_region(smba, SMBIOSIZE);
 577                 return -ENOMEM;
 578         }
 579
 580         adap->owner = THIS_MODULE;
 581         adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 582         adap->algo = &smbus_algorithm;
 583
 584         adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
 585         if (adapdata == NULL) {
 586                 kfree(adap);
 587                 release_region(smba, SMBIOSIZE);
 588                 return -ENOMEM;
 589         }
 590
 591         adapdata->smba = smba;
 592
 593         /* set up the sysfs linkage to our parent device */
 594         adap->dev.parent = &dev->dev;
 595
 596         snprintf(adap->name, sizeof(adap->name),
 597                 "SMBus PIIX4 adapter at %04x", smba);
 598
 599         i2c_set_adapdata(adap, adapdata);
 600
 601         retval = i2c_add_adapter(adap);
 602         if (retval) {
 603                 dev_err(&dev->dev, "Couldn't register adapter!\n");
 604                 kfree(adapdata);
 605                 kfree(adap);
 606                 release_region(smba, SMBIOSIZE);
 607                 return retval;
 608         }
 609
 610         *padap = adap;
 611         return 0;
 612 }
 613
 614 static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
 615 {
 616         int retval;
 617
 618         if ((dev->vendor == PCI_VENDOR_ID_ATI &&
 619              dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
 620              dev->revision >= 0x40) ||
 621             dev->vendor == PCI_VENDOR_ID_AMD)
 622                 /* base address location etc changed in SB800 */
 623                 retval = piix4_setup_sb800(dev, id, 0);
 624         else
 625                 retval = piix4_setup(dev, id);
 626
 627         /* If no main SMBus found, give up */
 628         if (retval < 0)
 629                 return retval;
 630
 631         /* Try to register main SMBus adapter, give up if we can't */
 632         retval = piix4_add_adapter(dev, retval, &piix4_main_adapter);
 633         if (retval < 0)
 634                 return retval;
 635
 636         /* Check for auxiliary SMBus on some AMD chipsets */
 637         retval = -ENODEV;
 638
 639         if (dev->vendor == PCI_VENDOR_ID_ATI &&
 640             dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
 641                 if (dev->revision < 0x40) {
 642                         retval = piix4_setup_aux(dev, id, 0x58);
 643                 } else {
 644                         /* SB800 added aux bus too */
 645                         retval = piix4_setup_sb800(dev, id, 1);
 646                 }
 647         }
 648
 649         if (dev->vendor == PCI_VENDOR_ID_AMD &&
 650             dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) {
 651                 retval = piix4_setup_sb800(dev, id, 1);
 652         }
 653
 654         if (retval > 0) {
 655                 /* Try to add the aux adapter if it exists,
 656                  * piix4_add_adapter will clean up if this fails */
 657                 piix4_add_adapter(dev, retval, &piix4_aux_adapter);
 658         }
 659
 660         return 0;
 661 }
 662
 663 static void piix4_adap_remove(struct i2c_adapter *adap)
 664 {
 665         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
 666
 667         if (adapdata->smba) {
 668                 i2c_del_adapter(adap);
 669                 release_region(adapdata->smba, SMBIOSIZE);
 670                 kfree(adapdata);
 671                 kfree(adap);
 672         }
 673 }
 674
 675 static void piix4_remove(struct pci_dev *dev)
 676 {
 677         if (piix4_main_adapter) {
 678                 piix4_adap_remove(piix4_main_adapter);
 679                 piix4_main_adapter = NULL;
 680         }
 681
 682         if (piix4_aux_adapter) {
 683                 piix4_adap_remove(piix4_aux_adapter);
 684                 piix4_aux_adapter = NULL;
 685         }
 686 }
 687
 688 static struct pci_driver piix4_driver = {
 689         .name           = "piix4_smbus",
 690         .id_table       = piix4_ids,
 691         .probe          = piix4_probe,
 692         .remove         = piix4_remove,
 693 };
 694
 695 module_pci_driver(piix4_driver);
 696
 697 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 698                 "Philip Edelbrock <phil@netroedge.com>");
 699 MODULE_DESCRIPTION("PIIX4 SMBus driver");
 700 MODULE_LICENSE("GPL");