drivers/i2c/busses/i2c-piix4.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
   4     Philip Edelbrock <phil@netroedge.com>
   5
   6 */
   7
   8 /*
   9    Supports:
  10         Intel PIIX4, 440MX
  11         Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
  12         ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
  13         AMD Hudson-2, ML, CZ
  14         Hygon CZ
  15         SMSC Victory66
  16
  17    Note: we assume there can only be one device, with one or more
  18    SMBus interfaces.
  19    The device can register multiple i2c_adapters (up to PIIX4_MAX_ADAPTERS).
  20    For devices supporting multiple ports the i2c_adapter should provide
  21    an i2c_algorithm to access them.
  22 */
  23
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/pci.h>
  27 #include <linux/kernel.h>
  28 #include <linux/delay.h>
  29 #include <linux/stddef.h>
  30 #include <linux/ioport.h>
  31 #include <linux/i2c.h>
  32 #include <linux/slab.h>
  33 #include <linux/dmi.h>
  34 #include <linux/acpi.h>
  35 #include <linux/io.h>
  36
  37
  38 /* PIIX4 SMBus address offsets */
  39 #define SMBHSTSTS       (0 + piix4_smba)
  40 #define SMBHSLVSTS      (1 + piix4_smba)
  41 #define SMBHSTCNT       (2 + piix4_smba)
  42 #define SMBHSTCMD       (3 + piix4_smba)
  43 #define SMBHSTADD       (4 + piix4_smba)
  44 #define SMBHSTDAT0      (5 + piix4_smba)
  45 #define SMBHSTDAT1      (6 + piix4_smba)
  46 #define SMBBLKDAT       (7 + piix4_smba)
  47 #define SMBSLVCNT       (8 + piix4_smba)
  48 #define SMBSHDWCMD      (9 + piix4_smba)
  49 #define SMBSLVEVT       (0xA + piix4_smba)
  50 #define SMBSLVDAT       (0xC + piix4_smba)
  51
  52 /* count for request_region */
  53 #define SMBIOSIZE       9
  54
  55 /* PCI Address Constants */
  56 #define SMBBA           0x090
  57 #define SMBHSTCFG       0x0D2
  58 #define SMBSLVC         0x0D3
  59 #define SMBSHDW1        0x0D4
  60 #define SMBSHDW2        0x0D5
  61 #define SMBREV          0x0D6
  62
  63 /* Other settings */
  64 #define MAX_TIMEOUT     500
  65 #define  ENABLE_INT9    0
  66
  67 /* PIIX4 constants */
  68 #define PIIX4_QUICK             0x00
  69 #define PIIX4_BYTE              0x04
  70 #define PIIX4_BYTE_DATA         0x08
  71 #define PIIX4_WORD_DATA         0x0C
  72 #define PIIX4_BLOCK_DATA        0x14
  73
  74 /* Multi-port constants */
  75 #define PIIX4_MAX_ADAPTERS      4
  76 #define HUDSON2_MAIN_PORTS      2 /* HUDSON2, KERNCZ reserves ports 3, 4 */
  77
  78 /* SB800 constants */
  79 #define SB800_PIIX4_SMB_IDX             0xcd6
  80
  81 #define KERNCZ_IMC_IDX                  0x3e
  82 #define KERNCZ_IMC_DATA                 0x3f
  83
  84 /*
  85  * SB800 port is selected by bits 2:1 of the smb_en register (0x2c)
  86  * or the smb_sel register (0x2e), depending on bit 0 of register 0x2f.
  87  * Hudson-2/Bolton port is always selected by bits 2:1 of register 0x2f.
  88  */
  89 #define SB800_PIIX4_PORT_IDX            0x2c
  90 #define SB800_PIIX4_PORT_IDX_ALT        0x2e
  91 #define SB800_PIIX4_PORT_IDX_SEL        0x2f
  92 #define SB800_PIIX4_PORT_IDX_MASK       0x06
  93 #define SB800_PIIX4_PORT_IDX_SHIFT      1
  94
  95 /* On kerncz and Hudson2, SmBus0Sel is at bit 20:19 of PMx00 DecodeEn */
  96 #define SB800_PIIX4_PORT_IDX_KERNCZ             0x02
  97 #define SB800_PIIX4_PORT_IDX_MASK_KERNCZ        0x18
  98 #define SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ       3
  99
 100 /* insmod parameters */
 101
 102 /* If force is set to anything different from 0, we forcibly enable the
 103    PIIX4. DANGEROUS! */
 104 static int force;
 105 module_param (force, int, 0);
 106 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
 107
 108 /* If force_addr is set to anything different from 0, we forcibly enable
 109    the PIIX4 at the given address. VERY DANGEROUS! */
 110 static int force_addr;
 111 module_param_hw(force_addr, int, ioport, 0);
 112 MODULE_PARM_DESC(force_addr,
 113                  "Forcibly enable the PIIX4 at the given address. "
 114                  "EXTREMELY DANGEROUS!");
 115
 116 static int srvrworks_csb5_delay;
 117 static struct pci_driver piix4_driver;
 118
 119 static const struct dmi_system_id piix4_dmi_blacklist[] = {
 120         {
 121                 .ident = "Sapphire AM2RD790",
 122                 .matches = {
 123                         DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
 124                         DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
 125                 },
 126         },
 127         {
 128                 .ident = "DFI Lanparty UT 790FX",
 129                 .matches = {
 130                         DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
 131                         DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
 132                 },
 133         },
 134         { }
 135 };
 136
 137 /* The IBM entry is in a separate table because we only check it
 138    on Intel-based systems */
 139 static const struct dmi_system_id piix4_dmi_ibm[] = {
 140         {
 141                 .ident = "IBM",
 142                 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
 143         },
 144         { },
 145 };
 146
 147 /*
 148  * SB800 globals
 149  */
 150 static u8 piix4_port_sel_sb800;
 151 static u8 piix4_port_mask_sb800;
 152 static u8 piix4_port_shift_sb800;
 153 static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
 154         " port 0", " port 2", " port 3", " port 4"
 155 };
 156 static const char *piix4_aux_port_name_sb800 = " port 1";
 157
 158 struct i2c_piix4_adapdata {
 159         unsigned short smba;
 160
 161         /* SB800 */
 162         bool sb800_main;
 163         bool notify_imc;
 164         u8 port;                /* Port number, shifted */
 165 };
 166
 167 static int piix4_setup(struct pci_dev *PIIX4_dev,
 168                        const struct pci_device_id *id)
 169 {
 170         unsigned char temp;
 171         unsigned short piix4_smba;
 172
 173         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
 174             (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
 175                 srvrworks_csb5_delay = 1;
 176
 177         /* On some motherboards, it was reported that accessing the SMBus
 178            caused severe hardware problems */
 179         if (dmi_check_system(piix4_dmi_blacklist)) {
 180                 dev_err(&PIIX4_dev->dev,
 181                         "Accessing the SMBus on this system is unsafe!\n");
 182                 return -EPERM;
 183         }
 184
 185         /* Don't access SMBus on IBM systems which get corrupted eeproms */
 186         if (dmi_check_system(piix4_dmi_ibm) &&
 187                         PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
 188                 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
 189                         "may corrupt your serial eeprom! Refusing to load "
 190                         "module!\n");
 191                 return -EPERM;
 192         }
 193
 194         /* Determine the address of the SMBus areas */
 195         if (force_addr) {
 196                 piix4_smba = force_addr & 0xfff0;
 197                 force = 0;
 198         } else {
 199                 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
 200                 piix4_smba &= 0xfff0;
 201                 if(piix4_smba == 0) {
 202                         dev_err(&PIIX4_dev->dev, "SMBus base address "
 203                                 "uninitialized - upgrade BIOS or use "
 204                                 "force_addr=0xaddr\n");
 205                         return -ENODEV;
 206                 }
 207         }
 208
 209         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 210                 return -ENODEV;
 211
 212         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 213                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
 214                         piix4_smba);
 215                 return -EBUSY;
 216         }
 217
 218         pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
 219
 220         /* If force_addr is set, we program the new address here. Just to make
 221            sure, we disable the PIIX4 first. */
 222         if (force_addr) {
 223                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
 224                 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
 225                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
 226                 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
 227                         "new address %04x!\n", piix4_smba);
 228         } else if ((temp & 1) == 0) {
 229                 if (force) {
 230                         /* This should never need to be done, but has been
 231                          * noted that many Dell machines have the SMBus
 232                          * interface on the PIIX4 disabled!? NOTE: This assumes
 233                          * I/O space and other allocations WERE done by the
 234                          * Bios!  Don't complain if your hardware does weird
 235                          * things after enabling this. :') Check for Bios
 236                          * updates before resorting to this.
 237                          */
 238                         pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
 239                                               temp | 1);
 240                         dev_notice(&PIIX4_dev->dev,
 241                                    "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
 242                 } else {
 243                         dev_err(&PIIX4_dev->dev,
 244                                 "SMBus Host Controller not enabled!\n");
 245                         release_region(piix4_smba, SMBIOSIZE);
 246                         return -ENODEV;
 247                 }
 248         }
 249
 250         if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
 251                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
 252         else if ((temp & 0x0E) == 0)
 253                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
 254         else
 255                 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
 256                         "(or code out of date)!\n");
 257
 258         pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
 259         dev_info(&PIIX4_dev->dev,
 260                  "SMBus Host Controller at 0x%x, revision %d\n",
 261                  piix4_smba, temp);
 262
 263         return piix4_smba;
 264 }
 265
 266 static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
 267                              const struct pci_device_id *id, u8 aux)
 268 {
 269         unsigned short piix4_smba;
 270         u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status, port_sel;
 271         u8 i2ccfg, i2ccfg_offset = 0x10;
 272
 273         /* SB800 and later SMBus does not support forcing address */
 274         if (force || force_addr) {
 275                 dev_err(&PIIX4_dev->dev, "SMBus does not support "
 276                         "forcing address!\n");
 277                 return -EINVAL;
 278         }
 279
 280         /* Determine the address of the SMBus areas */
 281         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
 282              PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
 283              PIIX4_dev->revision >= 0x41) ||
 284             (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
 285              PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
 286              PIIX4_dev->revision >= 0x49) ||
 287             (PIIX4_dev->vendor == PCI_VENDOR_ID_HYGON &&
 288              PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS))
 289                 smb_en = 0x00;
 290         else
 291                 smb_en = (aux) ? 0x28 : 0x2c;
 292
 293         if (!request_muxed_region(SB800_PIIX4_SMB_IDX, 2, "sb800_piix4_smb")) {
 294                 dev_err(&PIIX4_dev->dev,
 295                         "SMB base address index region 0x%x already in use.\n",
 296                         SB800_PIIX4_SMB_IDX);
 297                 return -EBUSY;
 298         }
 299
 300         outb_p(smb_en, SB800_PIIX4_SMB_IDX);
 301         smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
 302         outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
 303         smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
 304
 305         release_region(SB800_PIIX4_SMB_IDX, 2);
 306
 307         if (!smb_en) {
 308                 smb_en_status = smba_en_lo & 0x10;
 309                 piix4_smba = smba_en_hi << 8;
 310                 if (aux)
 311                         piix4_smba |= 0x20;
 312         } else {
 313                 smb_en_status = smba_en_lo & 0x01;
 314                 piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
 315         }
 316
 317         if (!smb_en_status) {
 318                 dev_err(&PIIX4_dev->dev,
 319                         "SMBus Host Controller not enabled!\n");
 320                 return -ENODEV;
 321         }
 322
 323         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 324                 return -ENODEV;
 325
 326         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 327                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
 328                         piix4_smba);
 329                 return -EBUSY;
 330         }
 331
 332         /* Aux SMBus does not support IRQ information */
 333         if (aux) {
 334                 dev_info(&PIIX4_dev->dev,
 335                          "Auxiliary SMBus Host Controller at 0x%x\n",
 336                          piix4_smba);
 337                 return piix4_smba;
 338         }
 339
 340         /* Request the SMBus I2C bus config region */
 341         if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
 342                 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
 343                         "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
 344                 release_region(piix4_smba, SMBIOSIZE);
 345                 return -EBUSY;
 346         }
 347         i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
 348         release_region(piix4_smba + i2ccfg_offset, 1);
 349
 350         if (i2ccfg & 1)
 351                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
 352         else
 353                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
 354
 355         dev_info(&PIIX4_dev->dev,
 356                  "SMBus Host Controller at 0x%x, revision %d\n",
 357                  piix4_smba, i2ccfg >> 4);
 358
 359         /* Find which register is used for port selection */
 360         if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD ||
 361             PIIX4_dev->vendor == PCI_VENDOR_ID_HYGON) {
 362                 if (PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS ||
 363                     (PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
 364                      PIIX4_dev->revision >= 0x1F)) {
 365                         piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_KERNCZ;
 366                         piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK_KERNCZ;
 367                         piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ;
 368                 } else {
 369                         piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_ALT;
 370                         piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
 371                         piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
 372                 }
 373         } else {
 374                 if (!request_muxed_region(SB800_PIIX4_SMB_IDX, 2,
 375                                           "sb800_piix4_smb")) {
 376                         release_region(piix4_smba, SMBIOSIZE);
 377                         return -EBUSY;
 378                 }
 379
 380                 outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX);
 381                 port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1);
 382                 piix4_port_sel_sb800 = (port_sel & 0x01) ?
 383                                        SB800_PIIX4_PORT_IDX_ALT :
 384                                        SB800_PIIX4_PORT_IDX;
 385                 piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
 386                 piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
 387                 release_region(SB800_PIIX4_SMB_IDX, 2);
 388         }
 389
 390         dev_info(&PIIX4_dev->dev,
 391                  "Using register 0x%02x for SMBus port selection\n",
 392                  (unsigned int)piix4_port_sel_sb800);
 393
 394         return piix4_smba;
 395 }
 396
 397 static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
 398                            const struct pci_device_id *id,
 399                            unsigned short base_reg_addr)
 400 {
 401         /* Set up auxiliary SMBus controllers found on some
 402          * AMD chipsets e.g. SP5100 (SB700 derivative) */
 403
 404         unsigned short piix4_smba;
 405
 406         /* Read address of auxiliary SMBus controller */
 407         pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
 408         if ((piix4_smba & 1) == 0) {
 409                 dev_dbg(&PIIX4_dev->dev,
 410                         "Auxiliary SMBus controller not enabled\n");
 411                 return -ENODEV;
 412         }
 413
 414         piix4_smba &= 0xfff0;
 415         if (piix4_smba == 0) {
 416                 dev_dbg(&PIIX4_dev->dev,
 417                         "Auxiliary SMBus base address uninitialized\n");
 418                 return -ENODEV;
 419         }
 420
 421         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
 422                 return -ENODEV;
 423
 424         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
 425                 dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
 426                         "already in use!\n", piix4_smba);
 427                 return -EBUSY;
 428         }
 429
 430         dev_info(&PIIX4_dev->dev,
 431                  "Auxiliary SMBus Host Controller at 0x%x\n",
 432                  piix4_smba);
 433
 434         return piix4_smba;
 435 }
 436
 437 static int piix4_transaction(struct i2c_adapter *piix4_adapter)
 438 {
 439         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
 440         unsigned short piix4_smba = adapdata->smba;
 441         int temp;
 442         int result = 0;
 443         int timeout = 0;
 444
 445         dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
 446                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
 447                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
 448                 inb_p(SMBHSTDAT1));
 449
 450         /* Make sure the SMBus host is ready to start transmitting */
 451         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 452                 dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
 453                         "Resetting...\n", temp);
 454                 outb_p(temp, SMBHSTSTS);
 455                 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 456                         dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
 457                         return -EBUSY;
 458                 } else {
 459                         dev_dbg(&piix4_adapter->dev, "Successful!\n");
 460                 }
 461         }
 462
 463         /* start the transaction by setting bit 6 */
 464         outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
 465
 466         /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
 467         if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
 468                 usleep_range(2000, 2100);
 469         else
 470                 usleep_range(250, 500);
 471
 472         while ((++timeout < MAX_TIMEOUT) &&
 473                ((temp = inb_p(SMBHSTSTS)) & 0x01))
 474                 usleep_range(250, 500);
 475
 476         /* If the SMBus is still busy, we give up */
 477         if (timeout == MAX_TIMEOUT) {
 478                 dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
 479                 result = -ETIMEDOUT;
 480         }
 481
 482         if (temp & 0x10) {
 483                 result = -EIO;
 484                 dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
 485         }
 486
 487         if (temp & 0x08) {
 488                 result = -EIO;
 489                 dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
 490                         "locked until next hard reset. (sorry!)\n");
 491                 /* Clock stops and slave is stuck in mid-transmission */
 492         }
 493
 494         if (temp & 0x04) {
 495                 result = -ENXIO;
 496                 dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
 497         }
 498
 499         if (inb_p(SMBHSTSTS) != 0x00)
 500                 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
 501
 502         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
 503                 dev_err(&piix4_adapter->dev, "Failed reset at end of "
 504                         "transaction (%02x)\n", temp);
 505         }
 506         dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
 507                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
 508                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
 509                 inb_p(SMBHSTDAT1));
 510         return result;
 511 }
 512
 513 /* Return negative errno on error. */
 514 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
 515                  unsigned short flags, char read_write,
 516                  u8 command, int size, union i2c_smbus_data * data)
 517 {
 518         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
 519         unsigned short piix4_smba = adapdata->smba;
 520         int i, len;
 521         int status;
 522
 523         switch (size) {
 524         case I2C_SMBUS_QUICK:
 525                 outb_p((addr << 1) | read_write,
 526                        SMBHSTADD);
 527                 size = PIIX4_QUICK;
 528                 break;
 529         case I2C_SMBUS_BYTE:
 530                 outb_p((addr << 1) | read_write,
 531                        SMBHSTADD);
 532                 if (read_write == I2C_SMBUS_WRITE)
 533                         outb_p(command, SMBHSTCMD);
 534                 size = PIIX4_BYTE;
 535                 break;
 536         case I2C_SMBUS_BYTE_DATA:
 537                 outb_p((addr << 1) | read_write,
 538                        SMBHSTADD);
 539                 outb_p(command, SMBHSTCMD);
 540                 if (read_write == I2C_SMBUS_WRITE)
 541                         outb_p(data->byte, SMBHSTDAT0);
 542                 size = PIIX4_BYTE_DATA;
 543                 break;
 544         case I2C_SMBUS_WORD_DATA:
 545                 outb_p((addr << 1) | read_write,
 546                        SMBHSTADD);
 547                 outb_p(command, SMBHSTCMD);
 548                 if (read_write == I2C_SMBUS_WRITE) {
 549                         outb_p(data->word & 0xff, SMBHSTDAT0);
 550                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
 551                 }
 552                 size = PIIX4_WORD_DATA;
 553                 break;
 554         case I2C_SMBUS_BLOCK_DATA:
 555                 outb_p((addr << 1) | read_write,
 556                        SMBHSTADD);
 557                 outb_p(command, SMBHSTCMD);
 558                 if (read_write == I2C_SMBUS_WRITE) {
 559                         len = data->block[0];
 560                         if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
 561                                 return -EINVAL;
 562                         outb_p(len, SMBHSTDAT0);
 563                         inb_p(SMBHSTCNT);       /* Reset SMBBLKDAT */
 564                         for (i = 1; i <= len; i++)
 565                                 outb_p(data->block[i], SMBBLKDAT);
 566                 }
 567                 size = PIIX4_BLOCK_DATA;
 568                 break;
 569         default:
 570                 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
 571                 return -EOPNOTSUPP;
 572         }
 573
 574         outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
 575
 576         status = piix4_transaction(adap);
 577         if (status)
 578                 return status;
 579
 580         if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
 581                 return 0;
 582
 583
 584         switch (size) {
 585         case PIIX4_BYTE:
 586         case PIIX4_BYTE_DATA:
 587                 data->byte = inb_p(SMBHSTDAT0);
 588                 break;
 589         case PIIX4_WORD_DATA:
 590                 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
 591                 break;
 592         case PIIX4_BLOCK_DATA:
 593                 data->block[0] = inb_p(SMBHSTDAT0);
 594                 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
 595                         return -EPROTO;
 596                 inb_p(SMBHSTCNT);       /* Reset SMBBLKDAT */
 597                 for (i = 1; i <= data->block[0]; i++)
 598                         data->block[i] = inb_p(SMBBLKDAT);
 599                 break;
 600         }
 601         return 0;
 602 }
 603
 604 static uint8_t piix4_imc_read(uint8_t idx)
 605 {
 606         outb_p(idx, KERNCZ_IMC_IDX);
 607         return inb_p(KERNCZ_IMC_DATA);
 608 }
 609
 610 static void piix4_imc_write(uint8_t idx, uint8_t value)
 611 {
 612         outb_p(idx, KERNCZ_IMC_IDX);
 613         outb_p(value, KERNCZ_IMC_DATA);
 614 }
 615
 616 static int piix4_imc_sleep(void)
 617 {
 618         int timeout = MAX_TIMEOUT;
 619
 620         if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
 621                 return -EBUSY;
 622
 623         /* clear response register */
 624         piix4_imc_write(0x82, 0x00);
 625         /* request ownership flag */
 626         piix4_imc_write(0x83, 0xB4);
 627         /* kick off IMC Mailbox command 96 */
 628         piix4_imc_write(0x80, 0x96);
 629
 630         while (timeout--) {
 631                 if (piix4_imc_read(0x82) == 0xfa) {
 632                         release_region(KERNCZ_IMC_IDX, 2);
 633                         return 0;
 634                 }
 635                 usleep_range(1000, 2000);
 636         }
 637
 638         release_region(KERNCZ_IMC_IDX, 2);
 639         return -ETIMEDOUT;
 640 }
 641
 642 static void piix4_imc_wakeup(void)
 643 {
 644         int timeout = MAX_TIMEOUT;
 645
 646         if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
 647                 return;
 648
 649         /* clear response register */
 650         piix4_imc_write(0x82, 0x00);
 651         /* release ownership flag */
 652         piix4_imc_write(0x83, 0xB5);
 653         /* kick off IMC Mailbox command 96 */
 654         piix4_imc_write(0x80, 0x96);
 655
 656         while (timeout--) {
 657                 if (piix4_imc_read(0x82) == 0xfa)
 658                         break;
 659                 usleep_range(1000, 2000);
 660         }
 661
 662         release_region(KERNCZ_IMC_IDX, 2);
 663 }
 664
 665 /*
 666  * Handles access to multiple SMBus ports on the SB800.
 667  * The port is selected by bits 2:1 of the smb_en register (0x2c).
 668  * Returns negative errno on error.
 669  *
 670  * Note: The selected port must be returned to the initial selection to avoid
 671  * problems on certain systems.
 672  */
 673 static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
 674                  unsigned short flags, char read_write,
 675                  u8 command, int size, union i2c_smbus_data *data)
 676 {
 677         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
 678         unsigned short piix4_smba = adapdata->smba;
 679         int retries = MAX_TIMEOUT;
 680         int smbslvcnt;
 681         u8 smba_en_lo;
 682         u8 port;
 683         int retval;
 684
 685         if (!request_muxed_region(SB800_PIIX4_SMB_IDX, 2, "sb800_piix4_smb"))
 686                 return -EBUSY;
 687
 688         /* Request the SMBUS semaphore, avoid conflicts with the IMC */
 689         smbslvcnt  = inb_p(SMBSLVCNT);
 690         do {
 691                 outb_p(smbslvcnt | 0x10, SMBSLVCNT);
 692
 693                 /* Check the semaphore status */
 694                 smbslvcnt  = inb_p(SMBSLVCNT);
 695                 if (smbslvcnt & 0x10)
 696                         break;
 697
 698                 usleep_range(1000, 2000);
 699         } while (--retries);
 700         /* SMBus is still owned by the IMC, we give up */
 701         if (!retries) {
 702                 retval = -EBUSY;
 703                 goto release;
 704         }
 705
 706         /*
 707          * Notify the IMC (Integrated Micro Controller) if required.
 708          * Among other responsibilities, the IMC is in charge of monitoring
 709          * the System fans and temperature sensors, and act accordingly.
 710          * All this is done through SMBus and can/will collide
 711          * with our transactions if they are long (BLOCK_DATA).
 712          * Therefore we need to request the ownership flag during those
 713          * transactions.
 714          */
 715         if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc) {
 716                 int ret;
 717
 718                 ret = piix4_imc_sleep();
 719                 switch (ret) {
 720                 case -EBUSY:
 721                         dev_warn(&adap->dev,
 722                                  "IMC base address index region 0x%x already in use.\n",
 723                                  KERNCZ_IMC_IDX);
 724                         break;
 725                 case -ETIMEDOUT:
 726                         dev_warn(&adap->dev,
 727                                  "Failed to communicate with the IMC.\n");
 728                         break;
 729                 default:
 730                         break;
 731                 }
 732
 733                 /* If IMC communication fails do not retry */
 734                 if (ret) {
 735                         dev_warn(&adap->dev,
 736                                  "Continuing without IMC notification.\n");
 737                         adapdata->notify_imc = false;
 738                 }
 739         }
 740
 741         outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
 742         smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
 743
 744         port = adapdata->port;
 745         if ((smba_en_lo & piix4_port_mask_sb800) != port)
 746                 outb_p((smba_en_lo & ~piix4_port_mask_sb800) | port,
 747                        SB800_PIIX4_SMB_IDX + 1);
 748
 749         retval = piix4_access(adap, addr, flags, read_write,
 750                               command, size, data);
 751
 752         outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
 753
 754         /* Release the semaphore */
 755         outb_p(smbslvcnt | 0x20, SMBSLVCNT);
 756
 757         if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc)
 758                 piix4_imc_wakeup();
 759
 760 release:
 761         release_region(SB800_PIIX4_SMB_IDX, 2);
 762         return retval;
 763 }
 764
 765 static u32 piix4_func(struct i2c_adapter *adapter)
 766 {
 767         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 768             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 769             I2C_FUNC_SMBUS_BLOCK_DATA;
 770 }
 771
 772 static const struct i2c_algorithm smbus_algorithm = {
 773         .smbus_xfer     = piix4_access,
 774         .functionality  = piix4_func,
 775 };
 776
 777 static const struct i2c_algorithm piix4_smbus_algorithm_sb800 = {
 778         .smbus_xfer     = piix4_access_sb800,
 779         .functionality  = piix4_func,
 780 };
 781
 782 static const struct pci_device_id piix4_ids[] = {
 783         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
 784         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
 785         { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
 786         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
 787         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
 788         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
 789         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
 790         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
 791         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
 792         { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
 793         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 794                      PCI_DEVICE_ID_SERVERWORKS_OSB4) },
 795         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 796                      PCI_DEVICE_ID_SERVERWORKS_CSB5) },
 797         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 798                      PCI_DEVICE_ID_SERVERWORKS_CSB6) },
 799         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 800                      PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
 801         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
 802                      PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
 803         { 0, }
 804 };
 805
 806 MODULE_DEVICE_TABLE (pci, piix4_ids);
 807
 808 static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS];
 809 static struct i2c_adapter *piix4_aux_adapter;
 810 static int piix4_adapter_count;
 811
 812 static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
 813                              bool sb800_main, u8 port, bool notify_imc,
 814                              u8 hw_port_nr, const char *name,
 815                              struct i2c_adapter **padap)
 816 {
 817         struct i2c_adapter *adap;
 818         struct i2c_piix4_adapdata *adapdata;
 819         int retval;
 820
 821         adap = kzalloc(sizeof(*adap), GFP_KERNEL);
 822         if (adap == NULL) {
 823                 release_region(smba, SMBIOSIZE);
 824                 return -ENOMEM;
 825         }
 826
 827         adap->owner = THIS_MODULE;
 828         adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 829         adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800
 830                                 : &smbus_algorithm;
 831
 832         adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
 833         if (adapdata == NULL) {
 834                 kfree(adap);
 835                 release_region(smba, SMBIOSIZE);
 836                 return -ENOMEM;
 837         }
 838
 839         adapdata->smba = smba;
 840         adapdata->sb800_main = sb800_main;
 841         adapdata->port = port << piix4_port_shift_sb800;
 842         adapdata->notify_imc = notify_imc;
 843
 844         /* set up the sysfs linkage to our parent device */
 845         adap->dev.parent = &dev->dev;
 846
 847         if (has_acpi_companion(&dev->dev)) {
 848                 acpi_preset_companion(&adap->dev,
 849                                       ACPI_COMPANION(&dev->dev),
 850                                       hw_port_nr);
 851         }
 852
 853         snprintf(adap->name, sizeof(adap->name),
 854                 "SMBus PIIX4 adapter%s at %04x", name, smba);
 855
 856         i2c_set_adapdata(adap, adapdata);
 857
 858         retval = i2c_add_adapter(adap);
 859         if (retval) {
 860                 kfree(adapdata);
 861                 kfree(adap);
 862                 release_region(smba, SMBIOSIZE);
 863                 return retval;
 864         }
 865
 866         *padap = adap;
 867         return 0;
 868 }
 869
 870 static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba,
 871                                     bool notify_imc)
 872 {
 873         struct i2c_piix4_adapdata *adapdata;
 874         int port;
 875         int retval;
 876
 877         if (dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS ||
 878             (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
 879              dev->revision >= 0x1F)) {
 880                 piix4_adapter_count = HUDSON2_MAIN_PORTS;
 881         } else {
 882                 piix4_adapter_count = PIIX4_MAX_ADAPTERS;
 883         }
 884
 885         for (port = 0; port < piix4_adapter_count; port++) {
 886                 u8 hw_port_nr = port == 0 ? 0 : port + 1;
 887
 888                 retval = piix4_add_adapter(dev, smba, true, port, notify_imc,
 889                                            hw_port_nr,
 890                                            piix4_main_port_names_sb800[port],
 891                                            &piix4_main_adapters[port]);
 892                 if (retval < 0)
 893                         goto error;
 894         }
 895
 896         return retval;
 897
 898 error:
 899         dev_err(&dev->dev,
 900                 "Error setting up SB800 adapters. Unregistering!\n");
 901         while (--port >= 0) {
 902                 adapdata = i2c_get_adapdata(piix4_main_adapters[port]);
 903                 if (adapdata->smba) {
 904                         i2c_del_adapter(piix4_main_adapters[port]);
 905                         kfree(adapdata);
 906                         kfree(piix4_main_adapters[port]);
 907                         piix4_main_adapters[port] = NULL;
 908                 }
 909         }
 910
 911         return retval;
 912 }
 913
 914 static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
 915 {
 916         int retval;
 917         bool is_sb800 = false;
 918
 919         if ((dev->vendor == PCI_VENDOR_ID_ATI &&
 920              dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
 921              dev->revision >= 0x40) ||
 922             dev->vendor == PCI_VENDOR_ID_AMD ||
 923             dev->vendor == PCI_VENDOR_ID_HYGON) {
 924                 bool notify_imc = false;
 925                 is_sb800 = true;
 926
 927                 if ((dev->vendor == PCI_VENDOR_ID_AMD ||
 928                      dev->vendor == PCI_VENDOR_ID_HYGON) &&
 929                     dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) {
 930                         u8 imc;
 931
 932                         /*
 933                          * Detect if IMC is active or not, this method is
 934                          * described on coreboot's AMD IMC notes
 935                          */
 936                         pci_bus_read_config_byte(dev->bus, PCI_DEVFN(0x14, 3),
 937                                                  0x40, &imc);
 938                         if (imc & 0x80)
 939                                 notify_imc = true;
 940                 }
 941
 942                 /* base address location etc changed in SB800 */
 943                 retval = piix4_setup_sb800(dev, id, 0);
 944                 if (retval < 0)
 945                         return retval;
 946
 947                 /*
 948                  * Try to register multiplexed main SMBus adapter,
 949                  * give up if we can't
 950                  */
 951                 retval = piix4_add_adapters_sb800(dev, retval, notify_imc);
 952                 if (retval < 0)
 953                         return retval;
 954         } else {
 955                 retval = piix4_setup(dev, id);
 956                 if (retval < 0)
 957                         return retval;
 958
 959                 /* Try to register main SMBus adapter, give up if we can't */
 960                 retval = piix4_add_adapter(dev, retval, false, 0, false, 0,
 961                                            "", &piix4_main_adapters[0]);
 962                 if (retval < 0)
 963                         return retval;
 964         }
 965
 966         /* Check for auxiliary SMBus on some AMD chipsets */
 967         retval = -ENODEV;
 968
 969         if (dev->vendor == PCI_VENDOR_ID_ATI &&
 970             dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
 971                 if (dev->revision < 0x40) {
 972                         retval = piix4_setup_aux(dev, id, 0x58);
 973                 } else {
 974                         /* SB800 added aux bus too */
 975                         retval = piix4_setup_sb800(dev, id, 1);
 976                 }
 977         }
 978
 979         if (dev->vendor == PCI_VENDOR_ID_AMD &&
 980             (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS ||
 981              dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS)) {
 982                 retval = piix4_setup_sb800(dev, id, 1);
 983         }
 984
 985         if (retval > 0) {
 986                 /* Try to add the aux adapter if it exists,
 987                  * piix4_add_adapter will clean up if this fails */
 988                 piix4_add_adapter(dev, retval, false, 0, false, 1,
 989                                   is_sb800 ? piix4_aux_port_name_sb800 : "",
 990                                   &piix4_aux_adapter);
 991         }
 992
 993         return 0;
 994 }
 995
 996 static void piix4_adap_remove(struct i2c_adapter *adap)
 997 {
 998         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
 999
1000         if (adapdata->smba) {
1001                 i2c_del_adapter(adap);
1002                 if (adapdata->port == (0 << piix4_port_shift_sb800))
1003                         release_region(adapdata->smba, SMBIOSIZE);
1004                 kfree(adapdata);
1005                 kfree(adap);
1006         }
1007 }
1008
1009 static void piix4_remove(struct pci_dev *dev)
1010 {
1011         int port = piix4_adapter_count;
1012
1013         while (--port >= 0) {
1014                 if (piix4_main_adapters[port]) {
1015                         piix4_adap_remove(piix4_main_adapters[port]);
1016                         piix4_main_adapters[port] = NULL;
1017                 }
1018         }
1019
1020         if (piix4_aux_adapter) {
1021                 piix4_adap_remove(piix4_aux_adapter);
1022                 piix4_aux_adapter = NULL;
1023         }
1024 }
1025
1026 static struct pci_driver piix4_driver = {
1027         .name           = "piix4_smbus",
1028         .id_table       = piix4_ids,
1029         .probe          = piix4_probe,
1030         .remove         = piix4_remove,
1031 };
1032
1033 module_pci_driver(piix4_driver);
1034
1035 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
1036 MODULE_AUTHOR("Philip Edelbrock <phil@netroedge.com>");
1037 MODULE_DESCRIPTION("PIIX4 SMBus driver");
1038 MODULE_LICENSE("GPL");