src/firmware/scsi.c

   1 //      Copyright (C) 2014 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 "scsi.h"\r
  19 #include "scsiPhy.h"\r
  20 #include "config.h"\r
  21 #include "diagnostic.h"\r
  22 #include "disk.h"\r
  23 #include "inquiry.h"\r
  24 #include "led.h"\r
  25 #include "mode.h"\r
  26 #include "time.h"\r
  27 #include "bsp.h"\r
  28 #include "cdrom.h"\r
  29 //#include "debug.h"\r
  30 #include "tape.h"\r
  31 #include "mo.h"\r
  32 #include "vendor.h"\r
  33 \r
  34 #include <string.h>\r
  35 \r
  36 // Global SCSI device state.\r
  37 ScsiDevice scsiDev S2S_DMA_ALIGN;\r
  38 \r
  39 static void enter_SelectionPhase(void);\r
  40 static void process_SelectionPhase(void);\r
  41 static void enter_MessageIn(uint8_t message);\r
  42 static void enter_Status(uint8_t status);\r
  43 static void enter_DataIn(int len);\r
  44 static void process_DataIn(void);\r
  45 static void process_DataOut(void);\r
  46 static void process_Command(void);\r
  47 \r
  48 static void doReserveRelease(void);\r
  49 \r
  50 void enter_BusFree()\r
  51 {\r
  52         // This delay probably isn't needed for most SCSI hosts, but it won't\r
  53         // hurt either. It's possible some of the samplers needed this delay.\r
  54         if (scsiDev.compatMode < COMPAT_SCSI2)\r
  55         {\r
  56                 s2s_delay_us(2);\r
  57         }\r
  58 \r
  59 #if 0\r
  60         if (scsiDev.status != GOOD && isDebugEnabled())\r
  61         {\r
  62                 // We want to capture debug information for failure cases.\r
  63                 s2s_delay_ms(64);\r
  64         }\r
  65 #endif\r
  66 \r
  67 \r
  68         scsiEnterBusFree();\r
  69 \r
  70         // Wait for the initiator to cease driving signals\r
  71         // Bus settle delay + bus clear delay = 1200ns\r
  72         s2s_delay_us(2);\r
  73 \r
  74 \r
  75         s2s_ledOff();\r
  76         scsiDev.phase = BUS_FREE;\r
  77         scsiDev.selFlag = 0;\r
  78 }\r
  79 \r
  80 static void enter_MessageIn(uint8_t message)\r
  81 {\r
  82         scsiDev.msgIn = message;\r
  83         scsiDev.phase = MESSAGE_IN;\r
  84 }\r
  85 \r
  86 int process_MessageIn(int releaseBusFree)\r
  87 {\r
  88         scsiEnterPhase(MESSAGE_IN);\r
  89         scsiWriteByte(scsiDev.msgIn);\r
  90 \r
  91         if (unlikely(scsiDev.atnFlag))\r
  92         {\r
  93                 // If there was a parity error, we go\r
  94                 // back to MESSAGE_OUT first, get out parity error message, then come\r
  95                 // back here.\r
  96                 return 0;\r
  97         }\r
  98         else if ((scsiDev.msgIn == MSG_LINKED_COMMAND_COMPLETE) ||\r
  99                 (scsiDev.msgIn == MSG_LINKED_COMMAND_COMPLETE_WITH_FLAG))\r
 100         {\r
 101                 // Go back to the command phase and start again.\r
 102                 scsiDev.phase = COMMAND;\r
 103                 scsiDev.dataPtr = 0;\r
 104                 scsiDev.savedDataPtr = 0;\r
 105                 scsiDev.dataLen = 0;\r
 106                 scsiDev.status = GOOD;\r
 107                 transfer.blocks = 0;\r
 108                 transfer.currentBlock = 0;\r
 109                 return 0;\r
 110         }\r
 111         else if (releaseBusFree) /*if (scsiDev.msgIn == MSG_COMMAND_COMPLETE)*/\r
 112         {\r
 113                 enter_BusFree();\r
 114                 return 1;\r
 115         }\r
 116         else\r
 117         {\r
 118                 return 1;\r
 119         }\r
 120 }\r
 121 \r
 122 static void messageReject()\r
 123 {\r
 124         scsiEnterPhase(MESSAGE_IN);\r
 125         scsiWriteByte(MSG_REJECT);\r
 126 }\r
 127 \r
 128 static void enter_Status(uint8_t status)\r
 129 {\r
 130         scsiDev.status = status;\r
 131         scsiDev.phase = STATUS;\r
 132 \r
 133         scsiDev.lastStatus = scsiDev.status;\r
 134         scsiDev.lastSense = scsiDev.target->sense.code;\r
 135         scsiDev.lastSenseASC = scsiDev.target->sense.asc;\r
 136 }\r
 137 \r
 138 void process_Status()\r
 139 {\r
 140         scsiEnterPhase(STATUS);\r
 141 \r
 142         uint8_t message;\r
 143 \r
 144         uint8_t control = scsiDev.cdb[scsiDev.cdbLen - 1];\r
 145 \r
 146         if (scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_OMTI)\r
 147         {\r
 148                 // OMTI non-standard LINK control\r
 149                 if (control & 0x01)\r
 150                 {\r
 151                         scsiDev.phase = COMMAND;\r
 152                         return;\r
 153                 }\r
 154         }\r
 155 \r
 156         if ((scsiDev.status == GOOD) && (control & 0x01))\r
 157         {\r
 158                 // Linked command.\r
 159                 scsiDev.status = INTERMEDIATE;\r
 160                 if (control & 0x02)\r
 161                 {\r
 162                         message = MSG_LINKED_COMMAND_COMPLETE_WITH_FLAG;\r
 163                 }\r
 164                 else\r
 165                 {\r
 166                         message = MSG_LINKED_COMMAND_COMPLETE;\r
 167                 }\r
 168         }\r
 169         else\r
 170         {\r
 171                 message = MSG_COMMAND_COMPLETE;\r
 172         }\r
 173 \r
 174         if (scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_OMTI)\r
 175         {\r
 176                 scsiDev.status |= (scsiDev.target->targetId & 0x03) << 5;\r
 177         }\r
 178 \r
 179         scsiWriteByte(scsiDev.status);\r
 180 \r
 181         scsiDev.lastStatus = scsiDev.status;\r
 182         scsiDev.lastSense = scsiDev.target->sense.code;\r
 183         scsiDev.lastSenseASC = scsiDev.target->sense.asc;\r
 184 \r
 185         // Command Complete occurs AFTER a valid status has been\r
 186         // sent. then we go bus-free.\r
 187         enter_MessageIn(message);\r
 188 }\r
 189 \r
 190 static void enter_DataIn(int len)\r
 191 {\r
 192         scsiDev.dataLen = len;\r
 193         scsiDev.phase = DATA_IN;\r
 194 }\r
 195 \r
 196 static void process_DataIn()\r
 197 {\r
 198         uint32_t len;\r
 199 \r
 200         if (scsiDev.dataLen > sizeof(scsiDev.data))\r
 201         {\r
 202                 scsiDev.dataLen = sizeof(scsiDev.data);\r
 203         }\r
 204 \r
 205         len = scsiDev.dataLen - scsiDev.dataPtr;\r
 206         if (len > 0)\r
 207         {\r
 208                 scsiEnterPhase(DATA_IN);\r
 209                 scsiWrite(scsiDev.data + scsiDev.dataPtr, len);\r
 210                 scsiDev.dataPtr += len;\r
 211         }\r
 212 \r
 213         if ((scsiDev.dataPtr >= scsiDev.dataLen) &&\r
 214                 (transfer.currentBlock == transfer.blocks))\r
 215         {\r
 216                 enter_Status(GOOD);\r
 217         }\r
 218 }\r
 219 \r
 220 static void process_DataOut()\r
 221 {\r
 222         uint32_t len;\r
 223 \r
 224         if (scsiDev.dataLen > sizeof(scsiDev.data))\r
 225         {\r
 226                 scsiDev.dataLen = sizeof(scsiDev.data);\r
 227         }\r
 228 \r
 229         len = scsiDev.dataLen - scsiDev.dataPtr;\r
 230         if (len > 0)\r
 231         {\r
 232                 scsiEnterPhase(DATA_OUT);\r
 233 \r
 234                 int parityError = 0;\r
 235                 scsiRead(scsiDev.data + scsiDev.dataPtr, len, &parityError);\r
 236                 scsiDev.dataPtr += len;\r
 237 \r
 238                 if (parityError &&\r
 239                         (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 240                 {\r
 241                         scsiDev.target->sense.code = ABORTED_COMMAND;\r
 242                         scsiDev.target->sense.asc = SCSI_PARITY_ERROR;\r
 243                         enter_Status(CHECK_CONDITION);\r
 244                 }\r
 245         }\r
 246 \r
 247         if ((scsiDev.dataPtr >= scsiDev.dataLen) &&\r
 248                 (transfer.currentBlock == transfer.blocks))\r
 249         {\r
 250                 if (scsiDev.postDataOutHook != NULL)\r
 251                 {\r
 252                         scsiDev.postDataOutHook();\r
 253                 }\r
 254                 else\r
 255                 {\r
 256                         enter_Status(GOOD);\r
 257                 }\r
 258         }\r
 259 }\r
 260 \r
 261 static const uint8_t CmdGroupBytes[8] = {6, 10, 10, 6, 6, 12, 6, 6};\r
 262 static void process_Command()\r
 263 {\r
 264         int group;\r
 265         uint8_t command;\r
 266         uint8_t control;\r
 267 \r
 268         scsiEnterPhase(COMMAND);\r
 269 \r
 270         memset(scsiDev.cdb + 6, 0, sizeof(scsiDev.cdb) - 6);\r
 271         int parityError = 0;\r
 272         scsiRead(scsiDev.cdb, 6, &parityError);\r
 273 \r
 274         group = scsiDev.cdb[0] >> 5;\r
 275         scsiDev.cdbLen = CmdGroupBytes[group];\r
 276         if (parityError &&\r
 277                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 278         {\r
 279                 // Don't try and read more bytes, as we cannot be sure what group\r
 280                 // the command should be.\r
 281         }\r
 282         else if (scsiDev.cdbLen - 6 > 0)\r
 283         {\r
 284                 scsiRead(scsiDev.cdb + 6, scsiDev.cdbLen - 6, &parityError);\r
 285         }\r
 286 \r
 287         command = scsiDev.cdb[0];\r
 288 \r
 289         // Prefer LUN's set by IDENTIFY messages for newer hosts.\r
 290         if (scsiDev.lun < 0)\r
 291         {\r
 292                 scsiDev.lun = scsiDev.cdb[1] >> 5;\r
 293         }\r
 294 \r
 295         control = scsiDev.cdb[scsiDev.cdbLen - 1];\r
 296 \r
 297         scsiDev.cmdCount++;\r
 298         const S2S_TargetCfg* cfg = scsiDev.target->cfg;\r
 299 \r
 300         if (unlikely(scsiDev.resetFlag))\r
 301         {\r
 302                 // Don't log bogus commands\r
 303                 scsiDev.cmdCount--;\r
 304                 memset(scsiDev.cdb, 0xff, sizeof(scsiDev.cdb));\r
 305                 return;\r
 306         }\r
 307         else if (parityError &&\r
 308                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 309         {\r
 310                 scsiDev.target->sense.code = ABORTED_COMMAND;\r
 311                 scsiDev.target->sense.asc = SCSI_PARITY_ERROR;\r
 312                 enter_Status(CHECK_CONDITION);\r
 313         }\r
 314         else if ((control & 0x02) && ((control & 0x01) == 0))\r
 315         {\r
 316                 // FLAG set without LINK flag.\r
 317                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 318                 scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
 319                 enter_Status(CHECK_CONDITION);\r
 320         }\r
 321         else if (command == 0x12)\r
 322         {\r
 323                 s2s_scsiInquiry();\r
 324         }\r
 325         else if (command == 0x03)\r
 326         {\r
 327                 // REQUEST SENSE\r
 328                 uint32_t allocLength = scsiDev.cdb[4];\r
 329 \r
 330                 // As specified by the SASI and SCSI1 standard.\r
 331                 // Newer initiators won't be specifying 0 anyway.\r
 332                 if (allocLength == 0) allocLength = 4;\r
 333 \r
 334                 memset(scsiDev.data, 0, 256); // Max possible alloc length\r
 335                 scsiDev.data[0] = 0xF0;\r
 336                 scsiDev.data[2] = scsiDev.target->sense.code & 0x0F;\r
 337 \r
 338                 scsiDev.data[3] = transfer.lba >> 24;\r
 339                 scsiDev.data[4] = transfer.lba >> 16;\r
 340                 scsiDev.data[5] = transfer.lba >> 8;\r
 341                 scsiDev.data[6] = transfer.lba;\r
 342 \r
 343                 // Additional bytes if there are errors to report\r
 344                 scsiDev.data[7] = 10; // additional length\r
 345                 scsiDev.data[12] = scsiDev.target->sense.asc >> 8;\r
 346                 scsiDev.data[13] = scsiDev.target->sense.asc;\r
 347 \r
 348                 // Silently truncate results. SCSI-2 spec 8.2.14.\r
 349                 enter_DataIn(allocLength);\r
 350 \r
 351                 // This is a good time to clear out old sense information.\r
 352                 scsiDev.target->sense.code = NO_SENSE;\r
 353                 scsiDev.target->sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
 354         }\r
 355         // Some old SCSI drivers do NOT properly support\r
 356         // unitAttention. eg. the Mac Plus would trigger a SCSI reset\r
 357         // on receiving the unit attention response on boot, thus\r
 358         // triggering another unit attention condition.\r
 359         else if (scsiDev.target->unitAttention &&\r
 360                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_UNIT_ATTENTION))\r
 361         {\r
 362                 scsiDev.target->sense.code = UNIT_ATTENTION;\r
 363                 scsiDev.target->sense.asc = scsiDev.target->unitAttention;\r
 364 \r
 365                 // If initiator doesn't do REQUEST SENSE for the next command, then\r
 366                 // data is lost.\r
 367                 scsiDev.target->unitAttention = 0;\r
 368 \r
 369                 enter_Status(CHECK_CONDITION);\r
 370         }\r
 371         else if (scsiDev.lun)\r
 372         {\r
 373                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 374                 scsiDev.target->sense.asc = LOGICAL_UNIT_NOT_SUPPORTED;\r
 375                 enter_Status(CHECK_CONDITION);\r
 376         }\r
 377         else if (command == 0x17 || command == 0x16)\r
 378         {\r
 379                 doReserveRelease();\r
 380         }\r
 381         else if ((scsiDev.target->reservedId >= 0) &&\r
 382                 (scsiDev.target->reservedId != scsiDev.initiatorId))\r
 383         {\r
 384                 enter_Status(CONFLICT);\r
 385         }\r
 386         // Handle odd device types first that may override basic read and\r
 387         // write commands. Will fall-through to generic disk handling.\r
 388         else if (((cfg->deviceType == S2S_CFG_OPTICAL) && scsiCDRomCommand()) ||\r
 389                 ((cfg->deviceType == S2S_CFG_SEQUENTIAL) && scsiTapeCommand()) ||\r
 390                 ((cfg->deviceType == S2S_CFG_MO) && scsiMOCommand()))\r
 391         {\r
 392                 // Already handled.\r
 393         }\r
 394         else if (scsiDiskCommand())\r
 395         {\r
 396                 // Already handled.\r
 397                 // check for the performance-critical read/write\r
 398                 // commands ASAP.\r
 399         }\r
 400         else if (command == 0x1C)\r
 401         {\r
 402                 scsiReceiveDiagnostic();\r
 403         }\r
 404         else if (command == 0x1D)\r
 405         {\r
 406                 scsiSendDiagnostic();\r
 407         }\r
 408         else if (command == 0x3B)\r
 409         {\r
 410                 scsiWriteBuffer();\r
 411         }\r
 412         else if (command == 0x3C)\r
 413         {\r
 414                 scsiReadBuffer();\r
 415         }\r
 416         else if (!scsiModeCommand() && !scsiVendorCommand())\r
 417         {\r
 418                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 419                 scsiDev.target->sense.asc = INVALID_COMMAND_OPERATION_CODE;\r
 420                 enter_Status(CHECK_CONDITION);\r
 421         }\r
 422 \r
 423         // Successful\r
 424         if (scsiDev.phase == COMMAND) // No status set, and not in DATA_IN\r
 425         {\r
 426                 enter_Status(GOOD);\r
 427         }\r
 428 \r
 429 }\r
 430 \r
 431 static void doReserveRelease()\r
 432 {\r
 433         int extentReservation = scsiDev.cdb[1] & 1;\r
 434         int thirdPty = scsiDev.cdb[1] & 0x10;\r
 435         int thirdPtyId = (scsiDev.cdb[1] >> 1) & 0x7;\r
 436         uint8_t command = scsiDev.cdb[0];\r
 437 \r
 438         int canRelease =\r
 439                 (!thirdPty && (scsiDev.initiatorId == scsiDev.target->reservedId)) ||\r
 440                         (thirdPty &&\r
 441                                 (scsiDev.target->reserverId == scsiDev.initiatorId) &&\r
 442                                 (scsiDev.target->reservedId == thirdPtyId)\r
 443                         );\r
 444 \r
 445         if (extentReservation)\r
 446         {\r
 447                 // Not supported.\r
 448                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 449                 scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
 450                 enter_Status(CHECK_CONDITION);\r
 451         }\r
 452         else if (command == 0x17) // release\r
 453         {\r
 454                 if ((scsiDev.target->reservedId < 0) || canRelease)\r
 455                 {\r
 456                         scsiDev.target->reservedId = -1;\r
 457                         scsiDev.target->reserverId = -1;\r
 458                 }\r
 459                 else\r
 460                 {\r
 461                         enter_Status(CONFLICT);\r
 462                 }\r
 463         }\r
 464         else // assume reserve.\r
 465         {\r
 466                 if ((scsiDev.target->reservedId < 0) || canRelease)\r
 467                 {\r
 468                         scsiDev.target->reserverId = scsiDev.initiatorId;\r
 469                         if (thirdPty)\r
 470                         {\r
 471                                 scsiDev.target->reservedId = thirdPtyId;\r
 472                         }\r
 473                         else\r
 474                         {\r
 475                                 scsiDev.target->reservedId = scsiDev.initiatorId;\r
 476                         }\r
 477                 }\r
 478                 else\r
 479                 {\r
 480                         // Already reserved by someone else!\r
 481                         enter_Status(CONFLICT);\r
 482                 }\r
 483         }\r
 484 }\r
 485 \r
 486 static uint32_t resetUntil = 0;\r
 487 \r
 488 static void scsiReset()\r
 489 {\r
 490         scsiDev.rstCount++;\r
 491         s2s_ledOff();\r
 492 \r
 493         scsiPhyReset();\r
 494 \r
 495         scsiDev.phase = BUS_FREE;\r
 496         scsiDev.atnFlag = 0;\r
 497         scsiDev.resetFlag = 0;\r
 498         scsiDev.selFlag = 0;\r
 499         scsiDev.lun = -1;\r
 500         scsiDev.compatMode = COMPAT_UNKNOWN;\r
 501 \r
 502         if (scsiDev.target)\r
 503         {\r
 504                 if (scsiDev.target->unitAttention != POWER_ON_RESET)\r
 505                 {\r
 506                         scsiDev.target->unitAttention = SCSI_BUS_RESET;\r
 507                 }\r
 508                 scsiDev.target->reservedId = -1;\r
 509                 scsiDev.target->reserverId = -1;\r
 510                 scsiDev.target->sense.code = NO_SENSE;\r
 511                 scsiDev.target->sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
 512         }\r
 513         scsiDev.target = NULL;\r
 514 \r
 515         for (int i = 0; i < S2S_MAX_TARGETS; ++i)\r
 516         {\r
 517                 scsiDev.targets[i].syncOffset = 0;\r
 518                 scsiDev.targets[i].syncPeriod = 0;\r
 519         }\r
 520         scsiDev.minSyncPeriod = 0;\r
 521 \r
 522         scsiDiskReset();\r
 523 \r
 524         scsiDev.postDataOutHook = NULL;\r
 525 \r
 526         scsiDev.sdUnderrunCount = 0;\r
 527 \r
 528         // Sleep to allow the bus to settle down a bit.\r
 529         // We must be ready again within the "Reset to selection time" of\r
 530         // 250ms.\r
 531         // There is no guarantee that the RST line will be negated by then.\r
 532         // NOTE: We could be connected and powered by USB for configuration,\r
 533         // in which case TERMPWR cannot be supplied, and reset will ALWAYS\r
 534         // be true. Therefore, the sleep here must be slow to avoid slowing\r
 535         // USB comms\r
 536         resetUntil = s2s_getTime_ms() + 2; // At least 1ms.\r
 537 }\r
 538 \r
 539 static void enter_SelectionPhase()\r
 540 {\r
 541         // Ignore stale versions of this flag, but ensure we know the\r
 542         // current value if the flag is still set.\r
 543         scsiDev.atnFlag = 0;\r
 544         scsiDev.dataPtr = 0;\r
 545         scsiDev.savedDataPtr = 0;\r
 546         scsiDev.dataLen = 0;\r
 547         scsiDev.status = GOOD;\r
 548         scsiDev.phase = SELECTION;\r
 549         scsiDev.lun = -1;\r
 550         scsiDev.discPriv = 0;\r
 551 \r
 552         scsiDev.initiatorId = -1;\r
 553         scsiDev.target = NULL;\r
 554 \r
 555         transfer.blocks = 0;\r
 556         transfer.currentBlock = 0;\r
 557 \r
 558         scsiDev.postDataOutHook = NULL;\r
 559 \r
 560         scsiDev.needSyncNegotiationAck = 0;\r
 561 }\r
 562 \r
 563 static void process_SelectionPhase()\r
 564 {\r
 565         // Selection delays.\r
 566         // Many SCSI1 samplers that use a 5380 chip need a delay of at least 1ms.\r
 567         // The Mac Plus boot-time (ie. rom code) selection abort time\r
 568         // is < 1ms and must have no delay (standard suggests 250ms abort time)\r
 569         // Most newer SCSI2 hosts don't care either way.\r
 570         if (scsiDev.boardCfg.selectionDelay == 255) // auto\r
 571         {\r
 572                 if (scsiDev.compatMode < COMPAT_SCSI2)\r
 573                 {\r
 574                         s2s_delay_ms(1);\r
 575                 }\r
 576         }\r
 577         else if (scsiDev.boardCfg.selectionDelay != 0)\r
 578         {\r
 579                 s2s_delay_ms(scsiDev.boardCfg.selectionDelay);\r
 580         }\r
 581 \r
 582         uint8_t selStatus = *SCSI_STS_SELECTED;\r
 583         if ((selStatus == 0) && (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_SEL_LATCH))\r
 584         {\r
 585                 selStatus = scsiDev.selFlag;\r
 586         }\r
 587 \r
 588         int tgtIndex;\r
 589         TargetState* target = NULL;\r
 590         for (tgtIndex = 0; tgtIndex < S2S_MAX_TARGETS; ++tgtIndex)\r
 591         {\r
 592                 if (scsiDev.targets[tgtIndex].targetId == (selStatus & 7))\r
 593                 {\r
 594                         target = &scsiDev.targets[tgtIndex];\r
 595                         break;\r
 596                 }\r
 597         }\r
 598         if ((target != NULL) && (selStatus & 0x40))\r
 599         {\r
 600                 // We've been selected!\r
 601                 // Assert BSY - Selection success!\r
 602                 // must happen within 200us (Selection abort time) of seeing our\r
 603                 // ID + SEL.\r
 604                 // (Note: the initiator will be waiting the "Selection time-out delay"\r
 605                 // for our BSY response, which is actually a very generous 250ms)\r
 606                 *SCSI_CTRL_BSY = 1;\r
 607                 s2s_ledOn();\r
 608 \r
 609                 scsiDev.target = target;\r
 610 \r
 611                 // Do we enter MESSAGE OUT immediately ? SCSI 1 and 2 standards says\r
 612                 // move to MESSAGE OUT if ATN is true before we assert BSY.\r
 613                 // The initiator should assert ATN with SEL.\r
 614                 scsiDev.atnFlag = selStatus & 0x80;\r
 615 \r
 616 \r
 617                 // Unit attention breaks many older SCSI hosts. Disable it completely\r
 618                 // for SCSI-1 (and older) hosts, regardless of our configured setting.\r
 619                 // Enable the compatability mode also as many SASI and SCSI1\r
 620                 // controllers don't generate parity bits.\r
 621                 if (!scsiDev.atnFlag)\r
 622                 {\r
 623                         target->unitAttention = 0;\r
 624                         scsiDev.compatMode = COMPAT_SCSI1;\r
 625                 }\r
 626                 else if (!(scsiDev.boardCfg.flags & S2S_CFG_ENABLE_SCSI2))\r
 627                 {\r
 628                         scsiDev.compatMode = COMPAT_SCSI2_DISABLED;\r
 629                 }\r
 630                 else\r
 631                 {\r
 632                         scsiDev.compatMode = COMPAT_SCSI2;\r
 633                 }\r
 634 \r
 635                 scsiDev.selCount++;\r
 636 \r
 637 \r
 638                 // Save our initiator now that we're no longer in a time-critical\r
 639                 // section.\r
 640                 // SCSI1/SASI initiators may not set their own ID.\r
 641                 scsiDev.initiatorId = (selStatus >> 3) & 0x7;\r
 642 \r
 643                 while (likely(!scsiDev.resetFlag) && scsiStatusSEL())\r
 644                 {\r
 645                         // Wait until the end of the selection phase.\r
 646                 }\r
 647 \r
 648                 scsiDev.phase = COMMAND;\r
 649         }\r
 650         else if (!selStatus)\r
 651         {\r
 652                 scsiDev.phase = BUS_BUSY;\r
 653         }\r
 654         scsiDev.selFlag = 0;\r
 655 }\r
 656 \r
 657 static void process_MessageOut()\r
 658 {\r
 659         int wasNeedSyncNegotiationAck = scsiDev.needSyncNegotiationAck;\r
 660         scsiDev.needSyncNegotiationAck = 0; // Successful on -most- messages.\r
 661 \r
 662         scsiEnterPhase(MESSAGE_OUT);\r
 663 \r
 664         scsiDev.atnFlag = 0;\r
 665         scsiDev.msgOut = scsiReadByte();\r
 666         scsiDev.msgCount++;\r
 667 \r
 668         if (scsiParityError() &&\r
 669                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 670         {\r
 671                 // Skip the remaining message bytes, and then start the MESSAGE_OUT\r
 672                 // phase again from the start. The initiator will re-send the\r
 673                 // same set of messages.\r
 674                 while (scsiStatusATN() && !scsiDev.resetFlag)\r
 675                 {\r
 676                         scsiReadByte();\r
 677                 }\r
 678 \r
 679                 // Go-back and try the message again.\r
 680                 scsiDev.atnFlag = 1;\r
 681         }\r
 682         else if (scsiDev.msgOut == 0x00)\r
 683         {\r
 684                 // COMMAND COMPLETE. but why would the target be receiving this ? nfi.\r
 685                 enter_BusFree();\r
 686         }\r
 687         else if (scsiDev.msgOut == 0x06)\r
 688         {\r
 689                 // ABORT\r
 690                 scsiDiskReset();\r
 691                 enter_BusFree();\r
 692         }\r
 693         else if (scsiDev.msgOut == 0x0C)\r
 694         {\r
 695                 // BUS DEVICE RESET\r
 696 \r
 697                 scsiDiskReset();\r
 698 \r
 699                 scsiDev.target->unitAttention = SCSI_BUS_RESET;\r
 700 \r
 701                 // ANY initiator can reset the reservation state via this message.\r
 702                 scsiDev.target->reservedId = -1;\r
 703                 scsiDev.target->reserverId = -1;\r
 704 \r
 705                 // Cancel any sync negotiation\r
 706                 scsiDev.target->syncOffset = 0;\r
 707                 scsiDev.target->syncPeriod = 0;\r
 708 \r
 709                 enter_BusFree();\r
 710         }\r
 711         else if (scsiDev.msgOut == 0x05)\r
 712         {\r
 713                 // Initiate Detected Error\r
 714                 // Ignore for now\r
 715         }\r
 716         else if (scsiDev.msgOut == 0x0F)\r
 717         {\r
 718                 // INITIATE RECOVERY\r
 719                 // Ignore for now\r
 720         }\r
 721         else if (scsiDev.msgOut == 0x10)\r
 722         {\r
 723                 // RELEASE RECOVERY\r
 724                 // Ignore for now\r
 725                 enter_BusFree();\r
 726         }\r
 727         else if (scsiDev.msgOut == MSG_REJECT)\r
 728         {\r
 729                 // Message Reject\r
 730                 // Oh well.\r
 731 \r
 732                 if (wasNeedSyncNegotiationAck)\r
 733                 {\r
 734                         scsiDev.target->syncOffset = 0;\r
 735                         scsiDev.target->syncPeriod = 0;\r
 736                 }\r
 737         }\r
 738         else if (scsiDev.msgOut == 0x08)\r
 739         {\r
 740                 // NOP\r
 741         }\r
 742         else if (scsiDev.msgOut == 0x09)\r
 743         {\r
 744                 // Message Parity Error\r
 745                 // Go back and re-send the last message.\r
 746                 scsiDev.phase = MESSAGE_IN;\r
 747 \r
 748                 if (wasNeedSyncNegotiationAck)\r
 749                 {\r
 750                         scsiDev.target->syncOffset = 0;\r
 751                         scsiDev.target->syncPeriod = 0;\r
 752                 }\r
 753         }\r
 754         else if (scsiDev.msgOut & 0x80) // 0x80 -> 0xFF\r
 755         {\r
 756                 // IDENTIFY\r
 757                 if ((scsiDev.msgOut & 0x18) || // Reserved bits set.\r
 758                         (scsiDev.msgOut & 0x20))  // We don't have any target routines!\r
 759                 {\r
 760                         messageReject();\r
 761                 }\r
 762 \r
 763                 scsiDev.lun = scsiDev.msgOut & 0x7;\r
 764                 scsiDev.discPriv = \r
 765                         ((scsiDev.msgOut & 0x40) && (scsiDev.initiatorId >= 0))\r
 766                                 ? 1 : 0;\r
 767         }\r
 768         else if (scsiDev.msgOut >= 0x20 && scsiDev.msgOut <= 0x2F)\r
 769         {\r
 770                 // Two byte message. We don't support these. read and discard.\r
 771                 scsiReadByte();\r
 772 \r
 773                 if (scsiDev.msgOut == 0x23) {\r
 774                         // Ignore Wide Residue. We're only 8 bit anyway.\r
 775                 } else {\r
 776                         messageReject();\r
 777                 }\r
 778         }\r
 779         else if (scsiDev.msgOut == 0x01)\r
 780         {\r
 781                 int i;\r
 782 \r
 783                 // Extended message.\r
 784                 int msgLen = scsiReadByte();\r
 785                 if (msgLen == 0) msgLen = 256;\r
 786                 uint8_t extmsg[256];\r
 787                 for (i = 0; i < msgLen && !scsiDev.resetFlag; ++i)\r
 788                 {\r
 789                         // Discard bytes.\r
 790                         extmsg[i] = scsiReadByte();\r
 791                 }\r
 792 \r
 793                 if (extmsg[0] == 3 && msgLen == 2) // Wide Data Request\r
 794                 {\r
 795                         // Negotiate down to 8bit\r
 796                         scsiEnterPhase(MESSAGE_IN);\r
 797                         static const uint8_t WDTR[] = {0x01, 0x02, 0x03, 0x00};\r
 798                         scsiWrite(WDTR, sizeof(WDTR));\r
 799 \r
 800                         // SDTR becomes invalidated.\r
 801                         scsiDev.target->syncOffset = 0;\r
 802                         scsiDev.target->syncPeriod = 0;\r
 803                 }\r
 804                 else if (extmsg[0] == 1 && msgLen == 3) // Synchronous data request\r
 805                 {\r
 806                         int oldPeriod = scsiDev.target->syncPeriod;\r
 807                         int oldOffset = scsiDev.target->syncOffset;\r
 808 \r
 809                         int transferPeriod = extmsg[1];\r
 810                         int offset = extmsg[2];\r
 811 \r
 812                         if ((\r
 813                                         (transferPeriod > 0) &&\r
 814                                         (transferPeriod < scsiDev.minSyncPeriod)) ||\r
 815                                 (scsiDev.minSyncPeriod == 0))\r
 816                         {\r
 817                                 scsiDev.minSyncPeriod = transferPeriod;\r
 818                         }\r
 819 \r
 820                         if ((transferPeriod > 80) || // 320ns, 3.125MB/s\r
 821                                 // Amiga A590 (WD33C93 chip) only does 3.5MB/s sync\r
 822                                 // After 80 we start to run out of bits in the fpga timing\r
 823                                 // register.\r
 824                                 (transferPeriod == 0) ||\r
 825                                 (offset == 0) ||\r
 826                                 ((scsiDev.boardCfg.scsiSpeed != S2S_CFG_SPEED_NoLimit) &&\r
 827                                         (scsiDev.boardCfg.scsiSpeed <= S2S_CFG_SPEED_ASYNC_50)))\r
 828                         {\r
 829                                 scsiDev.target->syncOffset = 0;\r
 830                                 scsiDev.target->syncPeriod = 0;\r
 831                         } else {\r
 832                                 scsiDev.target->syncOffset = offset <= 15 ? offset : 15;\r
 833                                 // FAST20 / 50ns / 20MHz is disabled for now due to\r
 834                                 // data corruption while reading data. We can count the\r
 835                                 // ACK's correctly, but can't save the data to a register\r
 836                                 // before it changes. (ie. transferPeriod == 12)\r
 837                                 if ((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_TURBO) &&\r
 838                                         (transferPeriod <= 16))\r
 839                                 {\r
 840                                         scsiDev.target->syncPeriod = 16; // 15.6MB/s\r
 841                                 }\r
 842                                 else if (scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_TURBO)\r
 843                                 {\r
 844                                         scsiDev.target->syncPeriod = transferPeriod;\r
 845                                 }\r
 846                                 else if (transferPeriod <= 25 &&\r
 847                                         ((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_NoLimit) ||\r
 848                                                 (scsiDev.boardCfg.scsiSpeed >= S2S_CFG_SPEED_SYNC_10)))\r
 849                                 {\r
 850                                         scsiDev.target->syncPeriod = 25; // 100ns, 10MB/s\r
 851 \r
 852                                 } else if (transferPeriod < 50 &&\r
 853                                         ((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_NoLimit) ||\r
 854                                                 (scsiDev.boardCfg.scsiSpeed >= S2S_CFG_SPEED_SYNC_10)))\r
 855                                 {\r
 856                                         scsiDev.target->syncPeriod = transferPeriod;\r
 857                                 } else if (transferPeriod >= 50)\r
 858                                 {\r
 859                                         scsiDev.target->syncPeriod = transferPeriod;\r
 860                                 } else {\r
 861                                         scsiDev.target->syncPeriod = 50;\r
 862                                 }\r
 863                         }\r
 864 \r
 865                         if (transferPeriod != oldPeriod ||\r
 866                                 scsiDev.target->syncPeriod != oldPeriod ||\r
 867                                 offset != oldOffset ||\r
 868                                 scsiDev.target->syncOffset != oldOffset ||\r
 869                                 !wasNeedSyncNegotiationAck) // Don't get into infinite loops negotiating.\r
 870                         {\r
 871                                 scsiEnterPhase(MESSAGE_IN);\r
 872                                 uint8_t SDTR[] = {0x01, 0x03, 0x01, scsiDev.target->syncPeriod, scsiDev.target->syncOffset};\r
 873                                 scsiWrite(SDTR, sizeof(SDTR));\r
 874                                 scsiDev.needSyncNegotiationAck = 1; // Check if this message is rejected.\r
 875                                 scsiDev.sdUnderrunCount = 0;  // reset counter, may work now.\r
 876                         }\r
 877                 }\r
 878                 else\r
 879                 {\r
 880                         // Not supported\r
 881                         messageReject();\r
 882                 }\r
 883         }\r
 884         else\r
 885         {\r
 886                 messageReject();\r
 887         }\r
 888 \r
 889         // Re-check the ATN flag in case it stays asserted.\r
 890         scsiDev.atnFlag |= scsiStatusATN();\r
 891 \r
 892         if (!scsiDev.atnFlag)\r
 893         {\r
 894                 // Message wasn't rejected!\r
 895                 scsiDev.needSyncNegotiationAck = 0;\r
 896         }\r
 897 }\r
 898 \r
 899 void scsiPoll(void)\r
 900 {\r
 901         if (resetUntil != 0 && resetUntil > s2s_getTime_ms())\r
 902         {\r
 903                 return;\r
 904         }\r
 905         resetUntil = 0;\r
 906 \r
 907         if (unlikely(scsiDev.resetFlag))\r
 908         {\r
 909                 scsiReset();\r
 910                 // Still in reset phase for a few ms.\r
 911                 // Do not try and process any commands.\r
 912                 return;\r
 913         }\r
 914 \r
 915         switch (scsiDev.phase)\r
 916         {\r
 917         case BUS_FREE:\r
 918                 if (scsiStatusBSY())\r
 919                 {\r
 920                         scsiDev.phase = BUS_BUSY;\r
 921                 }\r
 922                 // The Arbitration phase is optional for SCSI1/SASI hosts if there is only\r
 923                 // one initiator in the chain. Support this by moving\r
 924                 // straight to selection if SEL is asserted.\r
 925                 // ie. the initiator won't assert BSY and it's own ID before moving to selection.\r
 926                 else if (scsiDev.selFlag || *SCSI_STS_SELECTED)\r
 927                 {\r
 928                         enter_SelectionPhase();\r
 929                 }\r
 930         break;\r
 931 \r
 932         case BUS_BUSY:\r
 933                 // Someone is using the bus. Perhaps they are trying to\r
 934                 // select us.\r
 935                 if (scsiDev.selFlag || *SCSI_STS_SELECTED)\r
 936                 {\r
 937                         enter_SelectionPhase();\r
 938                 }\r
 939                 else if (!scsiStatusBSY())\r
 940                 {\r
 941                         scsiDev.phase = BUS_FREE;\r
 942                 }\r
 943         break;\r
 944 \r
 945         case ARBITRATION:\r
 946                 // TODO Support reselection.\r
 947                 break;\r
 948 \r
 949         case SELECTION:\r
 950                 process_SelectionPhase();\r
 951         break;\r
 952 \r
 953         case RESELECTION:\r
 954                 // Not currently supported!\r
 955         break;\r
 956 \r
 957         case COMMAND:\r
 958                 // Do not check ATN here. SCSI 1 & 2 initiators must set ATN\r
 959                 // and SEL together upon entering the selection phase if they\r
 960                 // want to send a message (IDENTIFY) immediately.\r
 961                 if (scsiDev.atnFlag)\r
 962                 {\r
 963                         process_MessageOut();\r
 964                 }\r
 965                 else\r
 966                 {\r
 967                         process_Command();\r
 968                 }\r
 969         break;\r
 970 \r
 971         case DATA_IN:\r
 972                 scsiDev.atnFlag |= scsiStatusATN();\r
 973                 if (scsiDev.atnFlag)\r
 974                 {\r
 975                         process_MessageOut();\r
 976                 }\r
 977                 else\r
 978                 {\r
 979                         process_DataIn();\r
 980                 }\r
 981         break;\r
 982 \r
 983         case DATA_OUT:\r
 984                 scsiDev.atnFlag |= scsiStatusATN();\r
 985                 if (scsiDev.atnFlag)\r
 986                 {\r
 987                         process_MessageOut();\r
 988                 }\r
 989                 else\r
 990                 {\r
 991                         process_DataOut();\r
 992                 }\r
 993         break;\r
 994 \r
 995         case STATUS:\r
 996                 scsiDev.atnFlag |= scsiStatusATN();\r
 997                 if (scsiDev.atnFlag)\r
 998                 {\r
 999                         process_MessageOut();\r
1000                 }\r
1001                 else\r
1002                 {\r
1003                         process_Status();\r
1004                 }\r
1005         break;\r
1006 \r
1007         case MESSAGE_IN:\r
1008                 scsiDev.atnFlag |= scsiStatusATN();\r
1009                 if (scsiDev.atnFlag)\r
1010                 {\r
1011                         process_MessageOut();\r
1012                 }\r
1013                 else\r
1014                 {\r
1015                         process_MessageIn(1);\r
1016                 }\r
1017 \r
1018         break;\r
1019 \r
1020         case MESSAGE_OUT:\r
1021                 process_MessageOut();\r
1022         break;\r
1023         }\r
1024 }\r
1025 \r
1026 void scsiInit()\r
1027 {\r
1028         static int firstInit = 1;\r
1029 \r
1030         scsiDev.atnFlag = 0;\r
1031         scsiDev.resetFlag = 1;\r
1032         scsiDev.selFlag = 0;\r
1033         scsiDev.phase = BUS_FREE;\r
1034         scsiDev.target = NULL;\r
1035         scsiDev.compatMode = COMPAT_UNKNOWN;\r
1036 \r
1037         int i;\r
1038         for (i = 0; i < S2S_MAX_TARGETS; ++i)\r
1039         {\r
1040                 const S2S_TargetCfg* cfg = s2s_getConfigByIndex(i);\r
1041                 if (cfg && (cfg->scsiId & S2S_CFG_TARGET_ENABLED))\r
1042                 {\r
1043                         scsiDev.targets[i].targetId = cfg->scsiId & S2S_CFG_TARGET_ID_BITS;\r
1044                         scsiDev.targets[i].cfg = cfg;\r
1045 \r
1046                         scsiDev.targets[i].liveCfg.bytesPerSector = cfg->bytesPerSector;\r
1047                 }\r
1048                 else\r
1049                 {\r
1050                         scsiDev.targets[i].targetId = 0xff;\r
1051                         scsiDev.targets[i].cfg = NULL;\r
1052                 }\r
1053                 scsiDev.targets[i].reservedId = -1;\r
1054                 scsiDev.targets[i].reserverId = -1;\r
1055                 if (firstInit)\r
1056                 {\r
1057                         scsiDev.targets[i].unitAttention = POWER_ON_RESET;\r
1058                 }\r
1059                 else\r
1060                 {\r
1061                         scsiDev.targets[i].unitAttention = PARAMETERS_CHANGED;\r
1062                 }\r
1063                 scsiDev.targets[i].sense.code = NO_SENSE;\r
1064                 scsiDev.targets[i].sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
1065 \r
1066                 scsiDev.targets[i].syncOffset = 0;\r
1067                 scsiDev.targets[i].syncPeriod = 0;\r
1068         }\r
1069         firstInit = 0;\r
1070 }\r
1071 \r
1072 /* TODO REENABLE\r
1073 void scsiDisconnect()\r
1074 {\r
1075         scsiEnterPhase(MESSAGE_IN);\r
1076         scsiWriteByte(0x02); // save data pointer\r
1077         scsiWriteByte(0x04); // disconnect msg.\r
1078 \r
1079         // For now, the caller is responsible for tracking the disconnected\r
1080         // state, and calling scsiReconnect.\r
1081         // Ideally the client would exit their loop and we'd implement this\r
1082         // as part of scsiPoll\r
1083         int phase = scsiDev.phase;\r
1084         enter_BusFree();\r
1085         scsiDev.phase = phase;\r
1086 }\r
1087 */\r
1088 \r
1089 /* TODO REENABLE\r
1090 int scsiReconnect()\r
1091 {\r
1092         int reconnected = 0;\r
1093 \r
1094         int sel = SCSI_ReadFilt(SCSI_Filt_SEL);\r
1095         int bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1096         if (!sel && !bsy)\r
1097         {\r
1098                 s2s_delay_us(1);\r
1099                 sel = SCSI_ReadFilt(SCSI_Filt_SEL);\r
1100                 bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1101         }\r
1102 \r
1103         if (!sel && !bsy)\r
1104         {\r
1105                 // Arbitrate.\r
1106                 s2s_ledOn();\r
1107                 uint8_t scsiIdMask = 1 << scsiDev.target->targetId;\r
1108                 SCSI_Out_Bits_Write(scsiIdMask);\r
1109                 SCSI_Out_Ctl_Write(1); // Write bits manually.\r
1110                 SCSI_SetPin(SCSI_Out_BSY);\r
1111 \r
1112                 s2s_delay_us(3); // arbitrate delay. 2.4us.\r
1113 \r
1114                 uint8_t dbx = scsiReadDBxPins();\r
1115                 sel = SCSI_ReadFilt(SCSI_Filt_SEL);\r
1116                 if (sel || ((dbx ^ scsiIdMask) > scsiIdMask))\r
1117                 {\r
1118                         // Lost arbitration.\r
1119                         SCSI_Out_Ctl_Write(0);\r
1120                         SCSI_ClearPin(SCSI_Out_BSY);\r
1121                         s2s_ledOff();\r
1122                 }\r
1123                 else\r
1124                 {\r
1125                         // Won arbitration\r
1126                         SCSI_SetPin(SCSI_Out_SEL);\r
1127                         s2s_delay_us(1); // Bus clear + Bus settle.\r
1128 \r
1129                         // Reselection phase\r
1130                         SCSI_CTL_PHASE_Write(__scsiphase_io);\r
1131                         SCSI_Out_Bits_Write(scsiIdMask | (1 << scsiDev.initiatorId));\r
1132                         scsiDeskewDelay(); // 2 deskew delays\r
1133                         scsiDeskewDelay(); // 2 deskew delays\r
1134                         SCSI_ClearPin(SCSI_Out_BSY);\r
1135                         s2s_delay_us(1);  // Bus Settle Delay\r
1136 \r
1137                         uint32_t waitStart_ms = getTime_ms();\r
1138                         bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1139                         // Wait for initiator.\r
1140                         while (\r
1141                                 !bsy &&\r
1142                                 !scsiDev.resetFlag &&\r
1143                                 (elapsedTime_ms(waitStart_ms) < 250))\r
1144                         {\r
1145                                 bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1146                         }\r
1147 \r
1148                         if (bsy)\r
1149                         {\r
1150                                 SCSI_SetPin(SCSI_Out_BSY);\r
1151                                 scsiDeskewDelay(); // 2 deskew delays\r
1152                                 scsiDeskewDelay(); // 2 deskew delays\r
1153                                 SCSI_ClearPin(SCSI_Out_SEL);\r
1154 \r
1155                                 // Prepare for the initial IDENTIFY message.\r
1156                                 SCSI_Out_Ctl_Write(0);\r
1157                                 scsiEnterPhase(MESSAGE_IN);\r
1158 \r
1159                                 // Send identify command\r
1160                                 scsiWriteByte(0x80);\r
1161 \r
1162                                 scsiEnterPhase(scsiDev.phase);\r
1163                                 reconnected = 1;\r
1164                         }\r
1165                         else\r
1166                         {\r
1167                                 // reselect timeout.\r
1168                                 SCSI_Out_Ctl_Write(0);\r
1169                                 SCSI_ClearPin(SCSI_Out_SEL);\r
1170                                 SCSI_CTL_PHASE_Write(0);\r
1171                                 s2s_ledOff();\r
1172                         }\r
1173                 }\r
1174         }\r
1175         return reconnected;\r
1176 }\r
1177 */\r
1178 \r