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