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     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20 /*
  21    Supports:
  22         Intel PIIX4, 440MX
  23         Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
  24         ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
  25         AMD Hudson-2, ML, CZ
  26         SMSC Victory66
  27
  28    Note: we assume there can only be one device, with one or more
  29    SMBus interfaces.
  30 */
  31
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/pci.h>
  35 #include <linux/kernel.h>
  36 #include <linux/delay.h>
  37 #include <linux/stddef.h>
  38 #include <linux/ioport.h>
  39 #include <linux/i2c.h>
  40 #include <linux/slab.h>
  41 #include <linux/dmi.h>
  42 #include <linux/acpi.h>
  43 #include <linux/io.h>
  44
  45
  46 /* PIIX4 SMBus address offsets */
  47 #define SMBHSTSTS       (0 + piix4_smba)
  48 #define SMBHSLVSTS      (1 + piix4_smba)
  49 #define SMBHSTCNT       (2 + piix4_smba)
  50 #define SMBHSTCMD       (3 + piix4_smba)
  51 #define SMBHSTADD       (4 + piix4_smba)
  52 #define SMBHSTDAT0      (5 + piix4_smba)
  53 #define SMBHSTDAT1      (6 + piix4_smba)
  54 #define SMBBLKDAT       (7 + piix4_smba)
  55 #define SMBSLVCNT       (8 + piix4_smba)
  56 #define SMBSHDWCMD      (9 + piix4_smba)
  57 #define SMBSLVEVT       (0xA + piix4_smba)
  58 #define SMBSLVDAT       (0xC + piix4_smba)
  59
  60 /* count for request_region */
  61 #define SMBIOSIZE       8
  62
  63 /* PCI Address Constants */
  64 #define SMBBA           0x090
  65 #define SMBHSTCFG       0x0D2
  66 #define SMBSLVC         0x0D3
  67 #define SMBSHDW1        0x0D4
  68 #define SMBSHDW2        0x0D5
  69 #define SMBREV          0x0D6
  70
  71 /* Other settings */
  72 #define MAX_TIMEOUT     500
  73 #define  ENABLE_INT9    0
  74
  75 /* PIIX4 constants */
  76 #define PIIX4_QUICK             0x00
  77 #define PIIX4_BYTE              0x04
  78 #define PIIX4_BYTE_DATA         0x08
  79 #define PIIX4_WORD_DATA         0x0C
  80 #define PIIX4_BLOCK_DATA        0x14
  81
  82 /* insmod parameters */
  83
  84 /* If force is set to anything different from 0, we forcibly enable the
  85    PIIX4. DANGEROUS! */
  86 static int force;
  87 module_param (force, int, 0);
  88 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
  89
  90 /* If force_addr is set to anything different from 0, we forcibly enable
  91    the PIIX4 at the given address. VERY DANGEROUS! */
  92 static int force_addr;
  93 module_param (force_addr, int, 0);
  94 MODULE_PARM_DESC(force_addr,
  95                  "Forcibly enable the PIIX4 at the given address. "
  96                  "EXTREMELY DANGEROUS!");
  97
  98 static int srvrworks_csb5_delay;
  99 static struct pci_driver piix4_driver;
 100
 101 static const struct dmi_system_id piix4_dmi_blacklist[] = {
 102         {
 103                 .ident = "Sapphire AM2RD790",
 104                 .matches = {
 105                         DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
 106                         DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
 107                 },
 108         },
 109         {
 110                 .ident = "DFI Lanparty UT 790FX",
 111                 .matches = {
 112                         DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
 113                         DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
 114                 },
 115         },
 116         { }
 117 };
 118
 119 /* The IBM entry is in a separate table because we only check it
 120    on Intel-based systems */
 121 static const struct dmi_system_id piix4_dmi_ibm[] = {
 122         {
 123                 .ident = "IBM",
 124                 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
 125         },
 126         { },
 127 };
 128
 129 struct i2c_piix4_adapdata {
 130         unsigned short smba;
 131 };
 132
 133 static int piix4_setup(struct pci_dev *PIIX4_dev,
 134                        const struct pci_device_id *id)
 135 {
 136         unsigned char temp;
 137         unsigned short piix4_smba;
 138
 139         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
 140             (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
 141                 srvrworks_csb5_delay = 1;
 142
 143         /* On some motherboards, it was reported that accessing the SMBus
 144            caused severe hardware problems */
 145         if (dmi_check_system(piix4_dmi_blacklist)) {
 146                 dev_err(&PIIX4_dev->dev,
 147                         "Accessing the SMBus on this system is unsafe!\n");
 148                 return -EPERM;
 149         }
 150
 151         /* Don't access SMBus on IBM systems which get corrupted eeproms */
 152         if (dmi_check_system(piix4_dmi_ibm) &&
 153                         PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
 154                 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
 155                         "may corrupt your serial eeprom! Refusing to load "
 156                         "module!\n");
 157                 return -EPERM;
 158         }
 159
 160         /* Determine the address of the SMBus areas */
 161         if (force_addr) {
 162                 piix4_smba = force_addr & 0xfff0;
 163                 force = 0;
 164         } else {
 165                 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
 166                 piix4_smba &= 0xfff0;
 167                 if(piix4_smba == 0) {
 168                         dev_err(&PIIX4_dev->dev, "SMBus base address "
 169                                 "uninitialized - upgrade BIOS or use "
 170                                 "force_addr=0xaddr\n");
 171                         return -ENODEV;
 172                 }
 173         }
 174
 175         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 176                 return -ENODEV;
 177
 178         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 179                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
 180                         piix4_smba);
 181                 return -EBUSY;
 182         }
 183
 184         pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
 185
 186         /* If force_addr is set, we program the new address here. Just to make
 187            sure, we disable the PIIX4 first. */
 188         if (force_addr) {
 189                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
 190                 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
 191                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
 192                 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
 193                         "new address %04x!\n", piix4_smba);
 194         } else if ((temp & 1) == 0) {
 195                 if (force) {
 196                         /* This should never need to be done, but has been
 197                          * noted that many Dell machines have the SMBus
 198                          * interface on the PIIX4 disabled!? NOTE: This assumes
 199                          * I/O space and other allocations WERE done by the
 200                          * Bios!  Don't complain if your hardware does weird
 201                          * things after enabling this. :') Check for Bios
 202                          * updates before resorting to this.
 203                          */
 204                         pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
 205                                               temp | 1);
 206                         dev_notice(&PIIX4_dev->dev,
 207                                    "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
 208                 } else {
 209                         dev_err(&PIIX4_dev->dev,
 210                                 "SMBus Host Controller not enabled!\n");
 211                         release_region(piix4_smba, SMBIOSIZE);
 212                         return -ENODEV;
 213                 }
 214         }
 215
 216         if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
 217                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
 218         else if ((temp & 0x0E) == 0)
 219                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
 220         else
 221                 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
 222                         "(or code out of date)!\n");
 223
 224         pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
 225         dev_info(&PIIX4_dev->dev,
 226                  "SMBus Host Controller at 0x%x, revision %d\n",
 227                  piix4_smba, temp);
 228
 229         return piix4_smba;
 230 }
 231
 232 static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 233                              const struct pci_device_id *id, u8 aux)
 234 {
 235         unsigned short piix4_smba;
 236         unsigned short smba_idx = 0xcd6;
 237         u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status;
 238         u8 i2ccfg, i2ccfg_offset = 0x10;
 239
 240         /* SB800 and later SMBus does not support forcing address */
 241         if (force || force_addr) {
 242                 dev_err(&PIIX4_dev->dev, "SMBus does not support "
 243                         "forcing address!\n");
 244                 return -EINVAL;
 245         }
 246
 247         /* Determine the address of the SMBus areas */
 248         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
 249              PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
 250              PIIX4_dev->revision >= 0x41) ||
 251             (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
 252              PIIX4_dev->device == 0x790b &&
 253              PIIX4_dev->revision >= 0x49))
 254                 smb_en = 0x00;
 255         else
 256                 smb_en = (aux) ? 0x28 : 0x2c;
 257
 258         if (!request_region(smba_idx, 2, "smba_idx")) {
 259                 dev_err(&PIIX4_dev->dev, "SMBus base address index region "
 260                         "0x%x already in use!\n", smba_idx);
 261                 return -EBUSY;
 262         }
 263         outb_p(smb_en, smba_idx);
 264         smba_en_lo = inb_p(smba_idx + 1);
 265         outb_p(smb_en + 1, smba_idx);
 266         smba_en_hi = inb_p(smba_idx + 1);
 267         release_region(smba_idx, 2);
 268
 269         if (!smb_en) {
 270                 smb_en_status = smba_en_lo & 0x10;
 271                 piix4_smba = smba_en_hi << 8;
 272                 if (aux)
 273                         piix4_smba |= 0x20;
 274         } else {
 275                 smb_en_status = smba_en_lo & 0x01;
 276                 piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
 277         }
 278
 279         if (!smb_en_status) {
 280                 dev_err(&PIIX4_dev->dev,
 281                         "SMBus Host Controller not enabled!\n");
 282                 return -ENODEV;
 283         }
 284
 285         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 286                 return -ENODEV;
 287
 288         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 289                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
 290                         piix4_smba);
 291                 return -EBUSY;
 292         }
 293
 294         /* Aux SMBus does not support IRQ information */
 295         if (aux) {
 296                 dev_info(&PIIX4_dev->dev,
 297                          "Auxiliary SMBus Host Controller at 0x%x\n",
 298                          piix4_smba);
 299                 return piix4_smba;
 300         }
 301
 302         /* Request the SMBus I2C bus config region */
 303         if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
 304                 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
 305                         "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
 306                 release_region(piix4_smba, SMBIOSIZE);
 307                 return -EBUSY;
 308         }
 309         i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
 310         release_region(piix4_smba + i2ccfg_offset, 1);
 311
 312         if (i2ccfg & 1)
 313                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
 314         else
 315                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
 316
 317         dev_info(&PIIX4_dev->dev,
 318                  "SMBus Host Controller at 0x%x, revision %d\n",
 319                  piix4_smba, i2ccfg >> 4);
 320
 321         return piix4_smba;
 322 }
 323
 324 static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
 325                            const struct pci_device_id *id,
 326                            unsigned short base_reg_addr)
 327 {
 328         /* Set up auxiliary SMBus controllers found on some
 329          * AMD chipsets e.g. SP5100 (SB700 derivative) */
 330
 331         unsigned short piix4_smba;
 332
 333         /* Read address of auxiliary SMBus controller */
 334         pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
 335         if ((piix4_smba & 1) == 0) {
 336                 dev_dbg(&PIIX4_dev->dev,
 337                         "Auxiliary SMBus controller not enabled\n");
 338                 return -ENODEV;
 339         }
 340
 341         piix4_smba &= 0xfff0;
 342         if (piix4_smba == 0) {
 343                 dev_dbg(&PIIX4_dev->dev,
 344                         "Auxiliary SMBus base address uninitialized\n");
 345                 return -ENODEV;
 346         }
 347
 348         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 349                 return -ENODEV;
 350
 351         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 352                 dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
 353                         "already in use!\n", piix4_smba);
 354                 return -EBUSY;
 355         }
 356
 357         dev_info(&PIIX4_dev->dev,
 358                  "Auxiliary SMBus Host Controller at 0x%x\n",
 359                  piix4_smba);
 360
 361         return piix4_smba;
 362 }
 363
 364 static int piix4_transaction(struct i2c_adapter *piix4_adapter)
 365 {
 366         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
 367         unsigned short piix4_smba = adapdata->smba;
 368         int temp;
 369         int result = 0;
 370         int timeout = 0;
 371
 372         dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
 373                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
 374                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
 375                 inb_p(SMBHSTDAT1));
 376
 377         /* Make sure the SMBus host is ready to start transmitting */
 378         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 379                 dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
 380                         "Resetting...\n", temp);
 381                 outb_p(temp, SMBHSTSTS);
 382                 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 383                         dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
 384                         return -EBUSY;
 385                 } else {
 386                         dev_dbg(&piix4_adapter->dev, "Successful!\n");
 387                 }
 388         }
 389
 390         /* start the transaction by setting bit 6 */
 391         outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
 392
 393         /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
 394         if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
 395                 msleep(2);
 396         else
 397                 msleep(1);
 398
 399         while ((++timeout < MAX_TIMEOUT) &&
 400                ((temp = inb_p(SMBHSTSTS)) & 0x01))
 401                 msleep(1);
 402
 403         /* If the SMBus is still busy, we give up */
 404         if (timeout == MAX_TIMEOUT) {
 405                 dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
 406                 result = -ETIMEDOUT;
 407         }
 408
 409         if (temp & 0x10) {
 410                 result = -EIO;
 411                 dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
 412         }
 413
 414         if (temp & 0x08) {
 415                 result = -EIO;
 416                 dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
 417                         "locked until next hard reset. (sorry!)\n");
 418                 /* Clock stops and slave is stuck in mid-transmission */
 419         }
 420
 421         if (temp & 0x04) {
 422                 result = -ENXIO;
 423                 dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
 424         }
 425
 426         if (inb_p(SMBHSTSTS) != 0x00)
 427                 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
 428
 429         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 430                 dev_err(&piix4_adapter->dev, "Failed reset at end of "
 431                         "transaction (%02x)\n", temp);
 432         }
 433         dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
 434                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
 435                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
 436                 inb_p(SMBHSTDAT1));
 437         return result;
 438 }
 439
 440 /* Return negative errno on error. */
 441 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
 442                  unsigned short flags, char read_write,
 443                  u8 command, int size, union i2c_smbus_data * data)
 444 {
 445         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
 446         unsigned short piix4_smba = adapdata->smba;
 447         int i, len;
 448         int status;
 449
 450         switch (size) {
 451         case I2C_SMBUS_QUICK:
 452                 outb_p((addr << 1) | read_write,
 453                        SMBHSTADD);
 454                 size = PIIX4_QUICK;
 455                 break;
 456         case I2C_SMBUS_BYTE:
 457                 outb_p((addr << 1) | read_write,
 458                        SMBHSTADD);
 459                 if (read_write == I2C_SMBUS_WRITE)
 460                         outb_p(command, SMBHSTCMD);
 461                 size = PIIX4_BYTE;
 462                 break;
 463         case I2C_SMBUS_BYTE_DATA:
 464                 outb_p((addr << 1) | read_write,
 465                        SMBHSTADD);
 466                 outb_p(command, SMBHSTCMD);
 467                 if (read_write == I2C_SMBUS_WRITE)
 468                         outb_p(data->byte, SMBHSTDAT0);
 469                 size = PIIX4_BYTE_DATA;
 470                 break;
 471         case I2C_SMBUS_WORD_DATA:
 472                 outb_p((addr << 1) | read_write,
 473                        SMBHSTADD);
 474                 outb_p(command, SMBHSTCMD);
 475                 if (read_write == I2C_SMBUS_WRITE) {
 476                         outb_p(data->word & 0xff, SMBHSTDAT0);
 477                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
 478                 }
 479                 size = PIIX4_WORD_DATA;
 480                 break;
 481         case I2C_SMBUS_BLOCK_DATA:
 482                 outb_p((addr << 1) | read_write,
 483                        SMBHSTADD);
 484                 outb_p(command, SMBHSTCMD);
 485                 if (read_write == I2C_SMBUS_WRITE) {
 486                         len = data->block[0];
 487                         if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
 488                                 return -EINVAL;
 489                         outb_p(len, SMBHSTDAT0);
 490                         i = inb_p(SMBHSTCNT);   /* Reset SMBBLKDAT */
 491                         for (i = 1; i <= len; i++)
 492                                 outb_p(data->block[i], SMBBLKDAT);
 493                 }
 494                 size = PIIX4_BLOCK_DATA;
 495                 break;
 496         default:
 497                 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
 498                 return -EOPNOTSUPP;
 499         }
 500
 501         outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
 502
 503         status = piix4_transaction(adap);
 504         if (status)
 505                 return status;
 506
 507         if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
 508                 return 0;
 509
 510
 511         switch (size) {
 512         case PIIX4_BYTE:
 513         case PIIX4_BYTE_DATA:
 514                 data->byte = inb_p(SMBHSTDAT0);
 515                 break;
 516         case PIIX4_WORD_DATA:
 517                 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
 518                 break;
 519         case PIIX4_BLOCK_DATA:
 520                 data->block[0] = inb_p(SMBHSTDAT0);
 521                 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
 522                         return -EPROTO;
 523                 i = inb_p(SMBHSTCNT);   /* Reset SMBBLKDAT */
 524                 for (i = 1; i <= data->block[0]; i++)
 525                         data->block[i] = inb_p(SMBBLKDAT);
 526                 break;
 527         }
 528         return 0;
 529 }
 530
 531 static u32 piix4_func(struct i2c_adapter *adapter)
 532 {
 533         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 534             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 535             I2C_FUNC_SMBUS_BLOCK_DATA;
 536 }
 537
 538 static const struct i2c_algorithm smbus_algorithm = {
 539         .smbus_xfer     = piix4_access,
 540         .functionality  = piix4_func,
 541 };
 542
 543 static DEFINE_PCI_DEVICE_TABLE(piix4_ids) = {
 544         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
 545         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
 546         { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
 547         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
 548         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
 549         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
 550         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
 551         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
 552         { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x790b) },
 553         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 554                      PCI_DEVICE_ID_SERVERWORKS_OSB4) },
 555         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 556                      PCI_DEVICE_ID_SERVERWORKS_CSB5) },
 557         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 558                      PCI_DEVICE_ID_SERVERWORKS_CSB6) },
 559         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 560                      PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
 561         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 562                      PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
 563         { 0, }
 564 };
 565
 566 MODULE_DEVICE_TABLE (pci, piix4_ids);
 567
 568 static struct i2c_adapter *piix4_main_adapter;
 569 static struct i2c_adapter *piix4_aux_adapter;
 570
 571 static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
 572                              struct i2c_adapter **padap)
 573 {
 574         struct i2c_adapter *adap;
 575         struct i2c_piix4_adapdata *adapdata;
 576         int retval;
 577
 578         adap = kzalloc(sizeof(*adap), GFP_KERNEL);
 579         if (adap == NULL) {
 580                 release_region(smba, SMBIOSIZE);
 581                 return -ENOMEM;
 582         }
 583
 584         adap->owner = THIS_MODULE;
 585         adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 586         adap->algo = &smbus_algorithm;
 587
 588         adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
 589         if (adapdata == NULL) {
 590                 kfree(adap);
 591                 release_region(smba, SMBIOSIZE);
 592                 return -ENOMEM;
 593         }
 594
 595         adapdata->smba = smba;
 596
 597         /* set up the sysfs linkage to our parent device */
 598         adap->dev.parent = &dev->dev;
 599
 600         snprintf(adap->name, sizeof(adap->name),
 601                 "SMBus PIIX4 adapter at %04x", smba);
 602
 603         i2c_set_adapdata(adap, adapdata);
 604
 605         retval = i2c_add_adapter(adap);
 606         if (retval) {
 607                 dev_err(&dev->dev, "Couldn't register adapter!\n");
 608                 kfree(adapdata);
 609                 kfree(adap);
 610                 release_region(smba, SMBIOSIZE);
 611                 return retval;
 612         }
 613
 614         *padap = adap;
 615         return 0;
 616 }
 617
 618 static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
 619 {
 620         int retval;
 621
 622         if ((dev->vendor == PCI_VENDOR_ID_ATI &&
 623              dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
 624              dev->revision >= 0x40) ||
 625             dev->vendor == PCI_VENDOR_ID_AMD)
 626                 /* base address location etc changed in SB800 */
 627                 retval = piix4_setup_sb800(dev, id, 0);
 628         else
 629                 retval = piix4_setup(dev, id);
 630
 631         /* If no main SMBus found, give up */
 632         if (retval < 0)
 633                 return retval;
 634
 635         /* Try to register main SMBus adapter, give up if we can't */
 636         retval = piix4_add_adapter(dev, retval, &piix4_main_adapter);
 637         if (retval < 0)
 638                 return retval;
 639
 640         /* Check for auxiliary SMBus on some AMD chipsets */
 641         retval = -ENODEV;
 642
 643         if (dev->vendor == PCI_VENDOR_ID_ATI &&
 644             dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
 645                 if (dev->revision < 0x40) {
 646                         retval = piix4_setup_aux(dev, id, 0x58);
 647                 } else {
 648                         /* SB800 added aux bus too */
 649                         retval = piix4_setup_sb800(dev, id, 1);
 650                 }
 651         }
 652
 653         if (dev->vendor == PCI_VENDOR_ID_AMD &&
 654             dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) {
 655                 retval = piix4_setup_sb800(dev, id, 1);
 656         }
 657
 658         if (retval > 0) {
 659                 /* Try to add the aux adapter if it exists,
 660                  * piix4_add_adapter will clean up if this fails */
 661                 piix4_add_adapter(dev, retval, &piix4_aux_adapter);
 662         }
 663
 664         return 0;
 665 }
 666
 667 static void piix4_adap_remove(struct i2c_adapter *adap)
 668 {
 669         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
 670
 671         if (adapdata->smba) {
 672                 i2c_del_adapter(adap);
 673                 release_region(adapdata->smba, SMBIOSIZE);
 674                 kfree(adapdata);
 675                 kfree(adap);
 676         }
 677 }
 678
 679 static void piix4_remove(struct pci_dev *dev)
 680 {
 681         if (piix4_main_adapter) {
 682                 piix4_adap_remove(piix4_main_adapter);
 683                 piix4_main_adapter = NULL;
 684         }
 685
 686         if (piix4_aux_adapter) {
 687                 piix4_adap_remove(piix4_aux_adapter);
 688                 piix4_aux_adapter = NULL;
 689         }
 690 }
 691
 692 static struct pci_driver piix4_driver = {
 693         .name           = "piix4_smbus",
 694         .id_table       = piix4_ids,
 695         .probe          = piix4_probe,
 696         .remove         = piix4_remove,
 697 };
 698
 699 module_pci_driver(piix4_driver);
 700
 701 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
 702                 "Philip Edelbrock <phil@netroedge.com>");
 703 MODULE_DESCRIPTION("PIIX4 SMBus driver");
 704 MODULE_LICENSE("GPL");