software/SCSI2SD/SCSI2SD.cydsn/scsi.c

   1 //      Copyright (C) 2013 Michael McMaster <michael@codesrc.com>\r
   2 //\r
   3 //      This file is part of SCSI2SD.\r
   4 //\r
   5 //      SCSI2SD is free software: you can redistribute it and/or modify\r
   6 //      it under the terms of the GNU General Public License as published by\r
   7 //      the Free Software Foundation, either version 3 of the License, or\r
   8 //      (at your option) any later version.\r
   9 //\r
  10 //      SCSI2SD is distributed in the hope that it will be useful,\r
  11 //      but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  12 //      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  13 //      GNU General Public License for more details.\r
  14 //\r
  15 //      You should have received a copy of the GNU General Public License\r
  16 //      along with SCSI2SD.  If not, see <http://www.gnu.org/licenses/>.\r
  17 \r
  18 #include "device.h"\r
  19 #include "scsi.h"\r
  20 #include "scsiPhy.h"\r
  21 #include "config.h"\r
  22 #include "bits.h"\r
  23 #include "diagnostic.h"\r
  24 #include "disk.h"\r
  25 #include "inquiry.h"\r
  26 #include "led.h"\r
  27 #include "mode.h"\r
  28 #include "disk.h"\r
  29 \r
  30 #include <string.h>\r
  31 \r
  32 // Global SCSI device state.\r
  33 ScsiDevice scsiDev;\r
  34 \r
  35 static void enter_SelectionPhase(void);\r
  36 static void process_SelectionPhase(void);\r
  37 static void enter_BusFree(void);\r
  38 static void enter_MessageIn(uint8 message);\r
  39 static void process_MessageIn(void);\r
  40 static void enter_Status(uint8 status);\r
  41 static void process_Status(void);\r
  42 static void enter_DataIn(int len);\r
  43 static void process_DataIn(void);\r
  44 static void process_DataOut(void);\r
  45 static void process_Command(void);\r
  46 \r
  47 static void doReserveRelease(void);\r
  48 \r
  49 static void enter_BusFree()\r
  50 {\r
  51         scsiEnterPhase(BUS_FREE);\r
  52 \r
  53         ledOff();\r
  54 \r
  55         scsiDev.phase = BUS_FREE;\r
  56         SCSI_ClearPin(SCSI_Out_BSY);\r
  57 }\r
  58 \r
  59 static void enter_MessageIn(uint8 message)\r
  60 {\r
  61         scsiDev.msgIn = message;\r
  62         scsiDev.phase = MESSAGE_IN;\r
  63 }\r
  64 \r
  65 static void process_MessageIn()\r
  66 {\r
  67         scsiEnterPhase(MESSAGE_IN);\r
  68         scsiWriteByte(scsiDev.msgIn);\r
  69 \r
  70         if (scsiDev.atnFlag)\r
  71         {\r
  72                 // If there was a parity error, we go\r
  73                 // back to MESSAGE_OUT first, get out parity error message, then come\r
  74                 // back here.\r
  75         }\r
  76         else /*if (scsiDev.msgIn == MSG_COMMAND_COMPLETE)*/\r
  77         {\r
  78                 enter_BusFree();\r
  79         }\r
  80 }\r
  81 \r
  82 static void messageReject()\r
  83 {\r
  84         scsiEnterPhase(MESSAGE_IN);\r
  85         scsiWriteByte(MSG_REJECT);\r
  86 }\r
  87 \r
  88 static void enter_Status(uint8 status)\r
  89 {\r
  90         scsiDev.status = status;\r
  91         scsiDev.phase = STATUS;\r
  92 }\r
  93 \r
  94 static void process_Status()\r
  95 {\r
  96         scsiEnterPhase(STATUS);\r
  97         scsiWriteByte(scsiDev.status);\r
  98 \r
  99         // Command Complete occurs AFTER a valid status has been\r
 100         // sent. then we go bus-free.\r
 101         enter_MessageIn(MSG_COMMAND_COMPLETE);\r
 102 }\r
 103 \r
 104 static void enter_DataIn(int len)\r
 105 {\r
 106         scsiDev.dataLen = len;\r
 107         scsiDev.phase = DATA_IN;\r
 108 }\r
 109 \r
 110 static void process_DataIn()\r
 111 {\r
 112         uint32 len;\r
 113         \r
 114         if (scsiDev.dataLen > sizeof(scsiDev.data))\r
 115         {\r
 116                 scsiDev.dataLen = sizeof(scsiDev.data);\r
 117         }\r
 118 \r
 119         len = scsiDev.dataLen - scsiDev.dataPtr;\r
 120         if (len > 0)\r
 121         {\r
 122                 scsiEnterPhase(DATA_IN);\r
 123                 scsiWrite(scsiDev.data + scsiDev.dataPtr, len);\r
 124                 scsiDev.dataPtr += len;\r
 125         }\r
 126 \r
 127         if ((scsiDev.dataPtr >= scsiDev.dataLen) &&\r
 128                 (transfer.currentBlock == transfer.blocks))\r
 129         {\r
 130                 enter_Status(GOOD);\r
 131         }\r
 132 }\r
 133 \r
 134 static void process_DataOut()\r
 135 {\r
 136         uint32 len;\r
 137         \r
 138         if (scsiDev.dataLen > sizeof(scsiDev.data))\r
 139         {\r
 140                 scsiDev.dataLen = sizeof(scsiDev.data);\r
 141         }\r
 142 \r
 143         scsiDev.parityError = 0;\r
 144         len = scsiDev.dataLen - scsiDev.dataPtr;\r
 145         if (len > 0)\r
 146         {\r
 147                 scsiEnterPhase(DATA_OUT);\r
 148 \r
 149                 scsiRead(scsiDev.data + scsiDev.dataPtr, len);\r
 150                 scsiDev.dataPtr += len;\r
 151 \r
 152                 // TODO re-implement parity checking\r
 153                 if (0 && scsiDev.parityError && config->enableParity)\r
 154                 {\r
 155                         scsiDev.sense.code = ABORTED_COMMAND;\r
 156                         scsiDev.sense.asc = SCSI_PARITY_ERROR;\r
 157                         enter_Status(CHECK_CONDITION);\r
 158                 }\r
 159         }\r
 160 \r
 161         if ((scsiDev.dataPtr >= scsiDev.dataLen) &&\r
 162                 (transfer.currentBlock == transfer.blocks))\r
 163         {\r
 164                 enter_Status(GOOD);\r
 165         }\r
 166 }\r
 167 \r
 168 static const uint8 CmdGroupBytes[8] = {6, 10, 10, 6, 6, 12, 6, 6};\r
 169 static void process_Command()\r
 170 {\r
 171         int group;\r
 172         int cmdSize;\r
 173         uint8 command;\r
 174         uint8 lun;\r
 175         \r
 176         scsiEnterPhase(COMMAND);\r
 177         scsiDev.parityError = 0;\r
 178 \r
 179         memset(scsiDev.cdb, 0, sizeof(scsiDev.cdb));\r
 180         scsiDev.cdb[0] = scsiReadByte();\r
 181 \r
 182         group = scsiDev.cdb[0] >> 5;\r
 183         cmdSize = CmdGroupBytes[group];\r
 184         scsiRead(scsiDev.cdb + 1, cmdSize - 1);\r
 185 \r
 186         command = scsiDev.cdb[0];\r
 187         lun = scsiDev.cdb[1] >> 5;\r
 188 \r
 189         if (scsiDev.parityError)\r
 190         {\r
 191                 scsiDev.sense.code = ABORTED_COMMAND;\r
 192                 scsiDev.sense.asc = SCSI_PARITY_ERROR;\r
 193                 enter_Status(CHECK_CONDITION);\r
 194         }\r
 195         else if (command == 0x12)\r
 196         {\r
 197                 scsiInquiry();\r
 198         }\r
 199         else if (command == 0x03)\r
 200         {\r
 201                 // REQUEST SENSE\r
 202                 uint32 allocLength = scsiDev.cdb[4];\r
 203                 if (allocLength == 0) allocLength = 256;\r
 204                 memset(scsiDev.data, 0, 18);\r
 205                 scsiDev.data[0] = 0xF0;\r
 206                 scsiDev.data[2] = scsiDev.sense.code & 0x0F;\r
 207 \r
 208                 // TODO populate "information" field with requested LBA.\r
 209                 // TODO support more detailed sense data ?\r
 210 \r
 211                 scsiDev.data[12] = scsiDev.sense.asc >> 8;\r
 212                 scsiDev.data[13] = scsiDev.sense.asc;\r
 213 \r
 214                 // Silently truncate results. SCSI-2 spec 8.2.14.\r
 215                 enter_DataIn(allocLength < 18 ? allocLength : 18);\r
 216 \r
 217                 // This is a good time to clear out old sense information.\r
 218                 scsiDev.sense.code = NO_SENSE;\r
 219                 scsiDev.sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
 220         }\r
 221         // Some old SCSI drivers do NOT properly support\r
 222         // unitAttention. OTOH, Linux seems to require it\r
 223         // confirmed LCIII with unknown scsi driver fials here.\r
 224         else if (scsiDev.unitAttention && config->enableUnitAttention)\r
 225         {\r
 226                 scsiDev.sense.code = UNIT_ATTENTION;\r
 227                 scsiDev.sense.asc = scsiDev.unitAttention;\r
 228                 enter_Status(CHECK_CONDITION);\r
 229         }\r
 230         else if (lun)\r
 231         {\r
 232                 scsiDev.sense.code = ILLEGAL_REQUEST;\r
 233                 scsiDev.sense.asc = LOGICAL_UNIT_NOT_SUPPORTED;\r
 234                 enter_Status(CHECK_CONDITION);\r
 235         }\r
 236         else if (command == 0x17 || command == 0x16)\r
 237         {\r
 238                 doReserveRelease();\r
 239         }\r
 240         else if ((scsiDev.reservedId >= 0) &&\r
 241                 (scsiDev.reservedId != scsiDev.initiatorId))\r
 242         {\r
 243                 enter_Status(CONFLICT);\r
 244         }\r
 245         else if (command == 0x1C)\r
 246         {\r
 247                 scsiReceiveDiagnostic();\r
 248         }\r
 249         else if (command == 0x1D)\r
 250         {\r
 251                 scsiSendDiagnostic();\r
 252         }\r
 253         else if (\r
 254                 !scsiModeCommand() &&\r
 255                 !scsiDiskCommand())\r
 256         {\r
 257                 scsiDev.sense.code = ILLEGAL_REQUEST;\r
 258                 scsiDev.sense.asc = INVALID_COMMAND_OPERATION_CODE;\r
 259                 enter_Status(CHECK_CONDITION);\r
 260         }\r
 261 \r
 262         // Successful\r
 263         if (scsiDev.phase == COMMAND) // No status set, and not in DATA_IN\r
 264         {\r
 265                 enter_Status(GOOD);\r
 266         }\r
 267 }\r
 268 \r
 269 static void doReserveRelease()\r
 270 {\r
 271         int extentReservation = scsiDev.cdb[1] & 1;\r
 272         int thirdPty = scsiDev.cdb[1] & 0x10;\r
 273         int thirdPtyId = (scsiDev.cdb[1] >> 1) & 0x7;\r
 274         uint8 command = scsiDev.cdb[0];\r
 275 \r
 276         int canRelease =\r
 277                 (!thirdPty && (scsiDev.initiatorId == scsiDev.reservedId)) ||\r
 278                         (thirdPty &&\r
 279                                 (scsiDev.reserverId == scsiDev.initiatorId) &&\r
 280                                 (scsiDev.reservedId == thirdPtyId)\r
 281                         );\r
 282 \r
 283         if (extentReservation)\r
 284         {\r
 285                 // Not supported.\r
 286                 scsiDev.sense.code = ILLEGAL_REQUEST;\r
 287                 scsiDev.sense.asc = INVALID_FIELD_IN_CDB;\r
 288                 enter_Status(CHECK_CONDITION);\r
 289         }\r
 290         else if (command == 0x17) // release\r
 291         {\r
 292                 if ((scsiDev.reservedId < 0) || canRelease)\r
 293                 {\r
 294                         scsiDev.reservedId = -1;\r
 295                         scsiDev.reserverId = -1;\r
 296                 }\r
 297                 else\r
 298                 {\r
 299                         enter_Status(CONFLICT);\r
 300                 }\r
 301         }\r
 302         else // assume reserve.\r
 303         {\r
 304                 if ((scsiDev.reservedId < 0) || canRelease)\r
 305                 {\r
 306                         scsiDev.reserverId = scsiDev.initiatorId;\r
 307                         if (thirdPty)\r
 308                         {\r
 309                                 scsiDev.reservedId = thirdPtyId;\r
 310                         }\r
 311                         else\r
 312                         {\r
 313                                 scsiDev.reservedId = scsiDev.initiatorId;\r
 314                         }\r
 315                 }\r
 316                 else\r
 317                 {\r
 318                         // Already reserved by someone else!\r
 319                         enter_Status(CONFLICT);\r
 320                 }\r
 321         }\r
 322 }\r
 323 \r
 324 static void scsiReset()\r
 325 {\r
 326         ledOff();\r
 327         // done in verilog SCSI_Out_DBx_Write(0);\r
 328         SCSI_CTL_IO_Write(0);\r
 329         SCSI_ClearPin(SCSI_Out_ATN);\r
 330         SCSI_ClearPin(SCSI_Out_BSY);\r
 331         SCSI_ClearPin(SCSI_Out_ACK);\r
 332         SCSI_ClearPin(SCSI_Out_RST);\r
 333         SCSI_ClearPin(SCSI_Out_SEL);\r
 334         SCSI_ClearPin(SCSI_Out_REQ);\r
 335         SCSI_ClearPin(SCSI_Out_MSG);\r
 336         SCSI_ClearPin(SCSI_Out_CD);\r
 337 \r
 338         scsiDev.parityError = 0;\r
 339         scsiDev.phase = BUS_FREE;\r
 340 \r
 341         if (scsiDev.unitAttention != POWER_ON_RESET)\r
 342         {\r
 343                 scsiDev.unitAttention = SCSI_BUS_RESET;\r
 344         }\r
 345         scsiDev.reservedId = -1;\r
 346         scsiDev.reserverId = -1;\r
 347         scsiDev.sense.code = NO_SENSE;\r
 348         scsiDev.sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
 349         scsiDiskReset();\r
 350 \r
 351         // Sleep to allow the bus to settle down a bit.\r
 352         // We must be ready again within the "Reset to selection time" of\r
 353         // 250ms.\r
 354         // There is no guarantee that the RST line will be negated by then.\r
 355         // NOTE: We could be connected and powered by USB for configuration,\r
 356         // in which case TERMPWR cannot be supplied, and reset will ALWAYS\r
 357         // be true.\r
 358         CyDelay(10); // 10ms.\r
 359         scsiDev.resetFlag = SCSI_ReadPin(SCSI_RST_INT);\r
 360         scsiDev.atnFlag = 0;\r
 361 }\r
 362 \r
 363 static void enter_SelectionPhase()\r
 364 {\r
 365         // Ignore stale versions of this flag, but ensure we know the\r
 366         // current value if the flag is still set.\r
 367         scsiDev.atnFlag = SCSI_ReadPin(SCSI_ATN_INT);\r
 368         scsiDev.parityError = 0;\r
 369         scsiDev.dataPtr = 0;\r
 370         scsiDev.savedDataPtr = 0;\r
 371         scsiDev.dataLen = 0;\r
 372         scsiDev.status = GOOD;\r
 373         scsiDev.phase = SELECTION;\r
 374 \r
 375         transfer.blocks = 0;\r
 376         transfer.currentBlock = 0;\r
 377 }\r
 378 \r
 379 static void process_SelectionPhase()\r
 380 {\r
 381         uint8 mask = scsiReadDBxPins();\r
 382         int goodParity = (Lookup_OddParity[mask] == SCSI_ReadPin(SCSI_In_DBP));\r
 383 \r
 384         int sel = SCSI_ReadPin(SCSI_In_SEL);\r
 385         int bsy = SCSI_ReadPin(SCSI_In_BSY);\r
 386         if (!bsy && sel &&\r
 387                 (mask & scsiDev.scsiIdMask) &&\r
 388                 (goodParity || !config->enableParity) && (countBits(mask) == 2))\r
 389         {\r
 390                 // We've been selected!\r
 391                 // Assert BSY - Selection success!\r
 392                 // must happen within 200us (Selection abort time) of seeing our\r
 393                 // ID + SEL.\r
 394                 // (Note: the initiator will be waiting the "Selection time-out delay"\r
 395                 // for our BSY response, which is actually a very generous 250ms)\r
 396                 SCSI_SetPin(SCSI_Out_BSY);\r
 397                 ledOn();\r
 398 \r
 399                 // Wait until the end of the selection phase.\r
 400                 while (!scsiDev.resetFlag)\r
 401                 {\r
 402                         scsiDev.atnFlag |= SCSI_ReadPin(SCSI_ATN_INT);\r
 403                         if (!SCSI_ReadPin(SCSI_In_SEL))\r
 404                         {\r
 405                                 break;\r
 406                         }\r
 407                 }\r
 408 \r
 409                 // Save our initiator now that we're no longer in a time-critical\r
 410                 // section.\r
 411                 {\r
 412                         int i;\r
 413                         uint8 initiatorMask = mask ^ scsiDev.scsiIdMask;\r
 414                         scsiDev.initiatorId = 0;\r
 415                         for (i = 0; i < 8; ++i)\r
 416                         {\r
 417                                 if (initiatorMask & (1 << i))\r
 418                                 {\r
 419                                         scsiDev.initiatorId = i;\r
 420                                         break;\r
 421                                 }\r
 422                         }\r
 423                 }\r
 424 \r
 425                 scsiDev.phase = COMMAND;\r
 426                 \r
 427                 CyDelayUs(2); // DODGY HACK\r
 428                 scsiDev.atnFlag |= SCSI_ReadPin(SCSI_ATN_INT);\r
 429         }\r
 430         else if (!sel)\r
 431         {\r
 432                 scsiDev.phase = BUS_BUSY;\r
 433         }\r
 434 }\r
 435 \r
 436 static void process_MessageOut()\r
 437 {\r
 438         scsiEnterPhase(MESSAGE_OUT);\r
 439 \r
 440         scsiDev.atnFlag = 0;\r
 441         scsiDev.parityError = 0;\r
 442         scsiDev.msgOut = scsiReadByte();\r
 443 \r
 444         if (scsiDev.parityError)\r
 445         {\r
 446                 // Skip the remaining message bytes, and then start the MESSAGE_OUT\r
 447                 // phase again from the start. The initiator will re-send the\r
 448                 // same set of messages.\r
 449                 while (SCSI_ReadPin(SCSI_ATN_INT) && !scsiDev.resetFlag)\r
 450                 {\r
 451                         scsiReadByte();\r
 452                 }\r
 453 \r
 454                 // Go-back and try the message again.\r
 455                 scsiDev.atnFlag = 1;\r
 456                 scsiDev.parityError = 0;\r
 457         }\r
 458         else if (scsiDev.msgOut == 0x00)\r
 459         {\r
 460                 // COMMAND COMPLETE. but why would the target be receiving this ? nfi.\r
 461                 enter_BusFree();\r
 462         }\r
 463         else if (scsiDev.msgOut == 0x06)\r
 464         {\r
 465                 // ABORT\r
 466                 scsiDiskReset();\r
 467                 enter_BusFree();\r
 468         }\r
 469         else if (scsiDev.msgOut == 0x0C)\r
 470         {\r
 471                 // BUS DEVICE RESET\r
 472 \r
 473                 scsiDiskReset();\r
 474 \r
 475                 scsiDev.unitAttention = SCSI_BUS_RESET;\r
 476 \r
 477                 // ANY initiator can reset the reservation state via this message.\r
 478                 scsiDev.reservedId = -1;\r
 479                 scsiDev.reserverId = -1;\r
 480                 enter_BusFree();\r
 481         }\r
 482         else if (scsiDev.msgOut == 0x05)\r
 483         {\r
 484                 // Initiate Detected Error\r
 485                 // Ignore for now\r
 486         }\r
 487         else if (scsiDev.msgOut == 0x0F)\r
 488         {\r
 489                 // INITIATE RECOVERY\r
 490                 // Ignore for now\r
 491         }\r
 492         else if (scsiDev.msgOut == 0x10)\r
 493         {\r
 494                 // RELEASE RECOVERY\r
 495                 // Ignore for now\r
 496                 enter_BusFree();\r
 497         }\r
 498         else if (scsiDev.msgOut == MSG_REJECT)\r
 499         {\r
 500                 // Message Reject\r
 501                 // Oh well.\r
 502                 scsiDev.resetFlag = 1;\r
 503         }\r
 504         else if (scsiDev.msgOut == 0x08)\r
 505         {\r
 506                 // NOP\r
 507         }\r
 508         else if (scsiDev.msgOut == 0x09)\r
 509         {\r
 510                 // Message Parity Error\r
 511                 // Go back and re-send the last message.\r
 512                 scsiDev.phase = MESSAGE_IN;\r
 513         }\r
 514         else if (scsiDev.msgOut & 0x80) // 0x80 -> 0xFF\r
 515         {\r
 516                 // IDENTIFY\r
 517                 // We don't disconnect, so ignore disconnect privilege.\r
 518                 if ((scsiDev.msgOut & 0x18) || // Reserved bits set.\r
 519                         (scsiDev.msgOut & 0x20)  || // We don't have any target routines!\r
 520                         (scsiDev.msgOut & 0x7) // We only support LUN 0!\r
 521                         )\r
 522                 {\r
 523                         messageReject();\r
 524                 }\r
 525         }\r
 526         else if (scsiDev.msgOut >= 0x20 && scsiDev.msgOut <= 0x2F)\r
 527         {\r
 528                 // Two byte message. We don't support these. read and discard.\r
 529                 scsiReadByte();\r
 530         }\r
 531         else if (scsiDev.msgOut == 0x01)\r
 532         {\r
 533                 int i;\r
 534                 \r
 535                 // Extended message.\r
 536                 int msgLen = scsiReadByte();\r
 537                 if (msgLen == 0) msgLen = 256;\r
 538                 for (i = 0; i < msgLen && !scsiDev.resetFlag; ++i)\r
 539                 {\r
 540                         // Discard bytes.\r
 541                         scsiReadByte();\r
 542                 }\r
 543 \r
 544                 // We don't support ANY extended messages.\r
 545                 // Modify Data Pointer:  We don't support reselection.\r
 546                 // Wide Data Transfer Request: No. 8bit only.\r
 547                 // Synchronous data transfer request. No, we can't do that.\r
 548                 // We don't support any 2-byte messages either.\r
 549                 // And we don't support any optional 1-byte messages.\r
 550                 // In each case, the correct response is MESSAGE REJECT.\r
 551                 messageReject();\r
 552         }\r
 553         else\r
 554         {\r
 555                 messageReject();\r
 556         }\r
 557         \r
 558         // Re-check the ATN flag. We won't get another interrupt if\r
 559         // it stays asserted.\r
 560         CyDelayUs(2); // DODGY HACK\r
 561         scsiDev.atnFlag |= SCSI_ReadPin(SCSI_ATN_INT);\r
 562 }\r
 563 \r
 564 \r
 565 // TODO remove.\r
 566 // This is a hack until I work out why the ATN ISR isn't\r
 567 // running when it should.\r
 568 static int atnErrCount = 0;\r
 569 static int atnHitCount = 0;\r
 570 static void checkATN()\r
 571 {\r
 572         int atn = SCSI_ReadPin(SCSI_ATN_INT);\r
 573         if (atn && !scsiDev.atnFlag)\r
 574         {\r
 575                 atnErrCount++;\r
 576                 scsiDev.atnFlag = 1;\r
 577         }\r
 578         else if (atn && scsiDev.atnFlag)\r
 579         {\r
 580                 atnHitCount++;\r
 581         }\r
 582 }\r
 583 \r
 584 void scsiPoll(void)\r
 585 {\r
 586         if (scsiDev.resetFlag)\r
 587         {\r
 588                 scsiReset();\r
 589         }\r
 590 \r
 591         switch (scsiDev.phase)\r
 592         {\r
 593         case BUS_FREE:\r
 594                 if (SCSI_ReadPin(SCSI_In_BSY))\r
 595                 {\r
 596                         scsiDev.phase = BUS_BUSY;\r
 597                 }\r
 598         break;\r
 599 \r
 600         case BUS_BUSY:\r
 601                 // Someone is using the bus. Perhaps they are trying to\r
 602                 // select us.\r
 603                 if (SCSI_ReadPin(SCSI_In_SEL))\r
 604                 {\r
 605                         enter_SelectionPhase();\r
 606                 }\r
 607                 else if (!SCSI_ReadPin(SCSI_In_BSY))\r
 608                 {\r
 609                         scsiDev.phase = BUS_FREE;\r
 610                 }\r
 611         break;\r
 612 \r
 613         case ARBITRATION:\r
 614                 // TODO Support reselection.\r
 615                 break;\r
 616 \r
 617         case SELECTION:\r
 618                 process_SelectionPhase();\r
 619         break;\r
 620 \r
 621         case RESELECTION:\r
 622                 // Not currently supported!\r
 623         break;\r
 624 \r
 625         case COMMAND:\r
 626                 checkATN();\r
 627                 if (scsiDev.atnFlag)\r
 628                 {\r
 629                         process_MessageOut();\r
 630                 }\r
 631                 else\r
 632                 {\r
 633                         process_Command();\r
 634                 }\r
 635         break;\r
 636 \r
 637         case DATA_IN:\r
 638                 checkATN();\r
 639                 if (scsiDev.atnFlag)\r
 640                 {\r
 641                         process_MessageOut();\r
 642                 }\r
 643                 else\r
 644                 {\r
 645                         process_DataIn();\r
 646                 }\r
 647         break;\r
 648 \r
 649         case DATA_OUT:\r
 650                 checkATN();\r
 651                 if (scsiDev.atnFlag)\r
 652                 {\r
 653                         process_MessageOut();\r
 654                 }\r
 655                 else\r
 656                 {\r
 657                         process_DataOut();\r
 658                 }\r
 659         break;\r
 660 \r
 661         case STATUS:\r
 662                 checkATN();\r
 663                 if (scsiDev.atnFlag)\r
 664                 {\r
 665                         process_MessageOut();\r
 666                 }\r
 667                 else\r
 668                 {\r
 669                         process_Status();\r
 670                 }\r
 671         break;\r
 672 \r
 673         case MESSAGE_IN:\r
 674                 checkATN();\r
 675                 if (scsiDev.atnFlag)\r
 676                 {\r
 677                         process_MessageOut();\r
 678                 }\r
 679                 else\r
 680                 {\r
 681                         process_MessageIn();\r
 682                 }\r
 683 \r
 684         break;\r
 685 \r
 686         case MESSAGE_OUT:\r
 687                 process_MessageOut();\r
 688         break;\r
 689         }\r
 690 }\r
 691 \r
 692 void scsiInit()\r
 693 {\r
 694         scsiDev.scsiIdMask = 1 << (config->scsiId);\r
 695 \r
 696         scsiDev.atnFlag = 0;\r
 697         scsiDev.resetFlag = 1;\r
 698         scsiDev.phase = BUS_FREE;\r
 699         scsiDev.reservedId = -1;\r
 700         scsiDev.reserverId = -1;\r
 701         scsiDev.unitAttention = POWER_ON_RESET;\r
 702 }\r
 703 \r