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                 scsiDev.target->cfg->quirks != S2S_CFG_QUIRKS_XEBEC)\r
 158         {\r
 159                 // Linked command.\r
 160                 scsiDev.status = INTERMEDIATE;\r
 161                 if (control & 0x02)\r
 162                 {\r
 163                         message = MSG_LINKED_COMMAND_COMPLETE_WITH_FLAG;\r
 164                 }\r
 165                 else\r
 166                 {\r
 167                         message = MSG_LINKED_COMMAND_COMPLETE;\r
 168                 }\r
 169         }\r
 170         else\r
 171         {\r
 172                 message = MSG_COMMAND_COMPLETE;\r
 173         }\r
 174 \r
 175         if (scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_XEBEC)\r
 176         {\r
 177                 // More non-standardness. Expects 2 status bytes (really status + msg)\r
 178                 // 00 d 000 err 0\r
 179                 // d == disk number\r
 180                 // ERR = 1 if error.\r
 181                 if (scsiDev.status == GOOD)\r
 182                 {\r
 183                         scsiWriteByte(scsiDev.cdb[1] & 0x20);\r
 184                 }\r
 185                 else\r
 186                 {\r
 187                         scsiWriteByte((scsiDev.cdb[1] & 0x20) | 0x2);\r
 188                 }\r
 189                 s2s_delay_us(10); // Seems to need a delay before changing phase bits.\r
 190         }\r
 191         else if (scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_OMTI)\r
 192         {\r
 193                 scsiDev.status |= (scsiDev.target->targetId & 0x03) << 5;\r
 194                 scsiWriteByte(scsiDev.status);\r
 195         }\r
 196         else\r
 197         {\r
 198                 scsiWriteByte(scsiDev.status);\r
 199         }\r
 200 \r
 201         scsiDev.lastStatus = scsiDev.status;\r
 202         scsiDev.lastSense = scsiDev.target->sense.code;\r
 203         scsiDev.lastSenseASC = scsiDev.target->sense.asc;\r
 204 \r
 205         // Command Complete occurs AFTER a valid status has been\r
 206         // sent. then we go bus-free.\r
 207         enter_MessageIn(message);\r
 208 }\r
 209 \r
 210 static void enter_DataIn(int len)\r
 211 {\r
 212         scsiDev.dataLen = len;\r
 213         scsiDev.phase = DATA_IN;\r
 214 }\r
 215 \r
 216 static void process_DataIn()\r
 217 {\r
 218         uint32_t len;\r
 219 \r
 220         if (scsiDev.dataLen > sizeof(scsiDev.data))\r
 221         {\r
 222                 scsiDev.dataLen = sizeof(scsiDev.data);\r
 223         }\r
 224 \r
 225         len = scsiDev.dataLen - scsiDev.dataPtr;\r
 226         if (len > 0)\r
 227         {\r
 228                 scsiEnterPhase(DATA_IN);\r
 229                 scsiWrite(scsiDev.data + scsiDev.dataPtr, len);\r
 230                 scsiDev.dataPtr += len;\r
 231         }\r
 232 \r
 233         if ((scsiDev.dataPtr >= scsiDev.dataLen) &&\r
 234                 (transfer.currentBlock == transfer.blocks))\r
 235         {\r
 236                 enter_Status(GOOD);\r
 237         }\r
 238 }\r
 239 \r
 240 static void process_DataOut()\r
 241 {\r
 242         uint32_t len;\r
 243 \r
 244         if (scsiDev.dataLen > sizeof(scsiDev.data))\r
 245         {\r
 246                 scsiDev.dataLen = sizeof(scsiDev.data);\r
 247         }\r
 248 \r
 249         len = scsiDev.dataLen - scsiDev.dataPtr;\r
 250         if (len > 0)\r
 251         {\r
 252                 scsiEnterPhase(DATA_OUT);\r
 253 \r
 254                 int parityError = 0;\r
 255                 scsiRead(scsiDev.data + scsiDev.dataPtr, len, &parityError);\r
 256                 scsiDev.dataPtr += len;\r
 257 \r
 258                 if (parityError &&\r
 259                         (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 260                 {\r
 261                         scsiDev.target->sense.code = ABORTED_COMMAND;\r
 262                         scsiDev.target->sense.asc = SCSI_PARITY_ERROR;\r
 263                         enter_Status(CHECK_CONDITION);\r
 264                 }\r
 265         }\r
 266 \r
 267         if ((scsiDev.dataPtr >= scsiDev.dataLen) &&\r
 268                 (transfer.currentBlock == transfer.blocks))\r
 269         {\r
 270                 if (scsiDev.postDataOutHook != NULL)\r
 271                 {\r
 272                         scsiDev.postDataOutHook();\r
 273                 }\r
 274                 else\r
 275                 {\r
 276                         enter_Status(GOOD);\r
 277                 }\r
 278         }\r
 279 }\r
 280 \r
 281 static const uint8_t CmdGroupBytes[8] = {6, 10, 10, 6, 6, 12, 6, 6};\r
 282 static void process_Command()\r
 283 {\r
 284         int group;\r
 285         uint8_t command;\r
 286         uint8_t control;\r
 287 \r
 288         scsiEnterPhase(COMMAND);\r
 289 \r
 290         memset(scsiDev.cdb + 6, 0, sizeof(scsiDev.cdb) - 6);\r
 291         int parityError = 0;\r
 292         scsiRead(scsiDev.cdb, 6, &parityError);\r
 293 \r
 294         group = scsiDev.cdb[0] >> 5;\r
 295         scsiDev.cdbLen = CmdGroupBytes[group];\r
 296         if (parityError &&\r
 297                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 298         {\r
 299                 // Don't try and read more bytes, as we cannot be sure what group\r
 300                 // the command should be.\r
 301         }\r
 302         else if (scsiDev.cdbLen - 6 > 0)\r
 303         {\r
 304                 scsiRead(scsiDev.cdb + 6, scsiDev.cdbLen - 6, &parityError);\r
 305         }\r
 306 \r
 307         command = scsiDev.cdb[0];\r
 308 \r
 309         // Prefer LUN's set by IDENTIFY messages for newer hosts.\r
 310         if (scsiDev.lun < 0)\r
 311         {\r
 312                 if (command == 0xE0 || command == 0xE4) // XEBEC s1410\r
 313                 {\r
 314                         scsiDev.lun = 0;\r
 315                 }\r
 316                 else\r
 317                 {\r
 318                         scsiDev.lun = scsiDev.cdb[1] >> 5;\r
 319                 }\r
 320         }\r
 321 \r
 322 \r
 323         // For Philips P2000C with Xebec S1410 SASI/MFM adapter\r
 324         // http://bitsavers.trailing-edge.com/pdf/xebec/104524C_S1410Man_Aug83.pdf\r
 325         if ((scsiDev.lun > 0) && (scsiDev.boardCfg.flags & S2S_CFG_MAP_LUNS_TO_IDS))\r
 326         {\r
 327                 int tgtIndex;\r
 328                 for (tgtIndex = 0; tgtIndex < S2S_MAX_TARGETS; ++tgtIndex)\r
 329                 {\r
 330                         if (scsiDev.targets[tgtIndex].targetId == scsiDev.lun)\r
 331                         {\r
 332                                 scsiDev.target = &scsiDev.targets[tgtIndex];\r
 333                                 scsiDev.lun = 0;\r
 334                                 break;\r
 335                         }\r
 336                 }\r
 337         }\r
 338 \r
 339         control = scsiDev.cdb[scsiDev.cdbLen - 1];\r
 340 \r
 341         scsiDev.cmdCount++;\r
 342         const S2S_TargetCfg* cfg = scsiDev.target->cfg;\r
 343 \r
 344         if (unlikely(scsiDev.resetFlag))\r
 345         {\r
 346                 // Don't log bogus commands\r
 347                 scsiDev.cmdCount--;\r
 348                 memset(scsiDev.cdb, 0xff, sizeof(scsiDev.cdb));\r
 349                 return;\r
 350         }\r
 351         else if (parityError &&\r
 352                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 353         {\r
 354                 scsiDev.target->sense.code = ABORTED_COMMAND;\r
 355                 scsiDev.target->sense.asc = SCSI_PARITY_ERROR;\r
 356                 enter_Status(CHECK_CONDITION);\r
 357         }\r
 358         else if ((control & 0x02) && ((control & 0x01) == 0) &&\r
 359                 // used for head step options on xebec.\r
 360                 likely(scsiDev.target->cfg->quirks != S2S_CFG_QUIRKS_XEBEC))\r
 361         {\r
 362                 // FLAG set without LINK flag.\r
 363                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 364                 scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
 365                 enter_Status(CHECK_CONDITION);\r
 366         }\r
 367         else if (command == 0x12)\r
 368         {\r
 369                 s2s_scsiInquiry();\r
 370         }\r
 371         else if (command == 0x03)\r
 372         {\r
 373                 // REQUEST SENSE\r
 374                 uint32_t allocLength = scsiDev.cdb[4];\r
 375 \r
 376                 if (scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_XEBEC)\r
 377                 {\r
 378                         // Completely non-standard\r
 379                         allocLength = 4;\r
 380                         if (scsiDev.target->sense.code == NO_SENSE)\r
 381                                 scsiDev.data[0] = 0;\r
 382                         else if (scsiDev.target->sense.code == ILLEGAL_REQUEST)\r
 383                                 scsiDev.data[0] = 0x20; // Illegal command\r
 384                         else if (scsiDev.target->sense.code == NOT_READY)\r
 385                                 scsiDev.data[0] = 0x04; // Drive not ready\r
 386                         else\r
 387                                 scsiDev.data[0] = 0x11;  // Uncorrectable data error\r
 388 \r
 389                         scsiDev.data[1] = (scsiDev.cdb[1] & 0x20) | ((transfer.lba >> 16) & 0x1F);\r
 390                         scsiDev.data[2] = transfer.lba >> 8;\r
 391                         scsiDev.data[3] = transfer.lba;\r
 392                 }\r
 393                 else\r
 394                 {\r
 395                         // As specified by the SASI and SCSI1 standard.\r
 396                         // Newer initiators won't be specifying 0 anyway.\r
 397                         if (allocLength == 0) allocLength = 4;\r
 398 \r
 399                         memset(scsiDev.data, 0, 256); // Max possible alloc length\r
 400                         scsiDev.data[0] = 0xF0;\r
 401                         scsiDev.data[2] = scsiDev.target->sense.code & 0x0F;\r
 402 \r
 403                         scsiDev.data[3] = transfer.lba >> 24;\r
 404                         scsiDev.data[4] = transfer.lba >> 16;\r
 405                         scsiDev.data[5] = transfer.lba >> 8;\r
 406                         scsiDev.data[6] = transfer.lba;\r
 407 \r
 408                         // Additional bytes if there are errors to report\r
 409                         scsiDev.data[7] = 10; // additional length\r
 410                         scsiDev.data[12] = scsiDev.target->sense.asc >> 8;\r
 411                         scsiDev.data[13] = scsiDev.target->sense.asc;\r
 412                 }\r
 413 \r
 414                 // Silently truncate results. SCSI-2 spec 8.2.14.\r
 415                 enter_DataIn(allocLength);\r
 416 \r
 417                 // This is a good time to clear out old sense information.\r
 418                 scsiDev.target->sense.code = NO_SENSE;\r
 419                 scsiDev.target->sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
 420         }\r
 421         // Some old SCSI drivers do NOT properly support\r
 422         // unitAttention. eg. the Mac Plus would trigger a SCSI reset\r
 423         // on receiving the unit attention response on boot, thus\r
 424         // triggering another unit attention condition.\r
 425         else if (scsiDev.target->unitAttention &&\r
 426                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_UNIT_ATTENTION))\r
 427         {\r
 428                 scsiDev.target->sense.code = UNIT_ATTENTION;\r
 429                 scsiDev.target->sense.asc = scsiDev.target->unitAttention;\r
 430 \r
 431                 // If initiator doesn't do REQUEST SENSE for the next command, then\r
 432                 // data is lost.\r
 433                 scsiDev.target->unitAttention = 0;\r
 434 \r
 435                 enter_Status(CHECK_CONDITION);\r
 436         }\r
 437         else if (scsiDev.lun)\r
 438         {\r
 439                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 440                 scsiDev.target->sense.asc = LOGICAL_UNIT_NOT_SUPPORTED;\r
 441                 enter_Status(CHECK_CONDITION);\r
 442         }\r
 443         else if (command == 0x17 || command == 0x16)\r
 444         {\r
 445                 doReserveRelease();\r
 446         }\r
 447         else if ((scsiDev.target->reservedId >= 0) &&\r
 448                 (scsiDev.target->reservedId != scsiDev.initiatorId))\r
 449         {\r
 450                 enter_Status(CONFLICT);\r
 451         }\r
 452         // Handle odd device types first that may override basic read and\r
 453         // write commands. Will fall-through to generic disk handling.\r
 454         else if (((cfg->deviceType == S2S_CFG_OPTICAL) && scsiCDRomCommand()) ||\r
 455                 ((cfg->deviceType == S2S_CFG_SEQUENTIAL) && scsiTapeCommand()) ||\r
 456                 ((cfg->deviceType == S2S_CFG_MO) && scsiMOCommand()))\r
 457         {\r
 458                 // Already handled.\r
 459         }\r
 460         else if (scsiDiskCommand())\r
 461         {\r
 462                 // Already handled.\r
 463                 // check for the performance-critical read/write\r
 464                 // commands ASAP.\r
 465         }\r
 466         else if (command == 0x1C)\r
 467         {\r
 468                 scsiReceiveDiagnostic();\r
 469         }\r
 470         else if (command == 0x1D)\r
 471         {\r
 472                 scsiSendDiagnostic();\r
 473         }\r
 474         else if (command == 0x3B)\r
 475         {\r
 476                 scsiWriteBuffer();\r
 477         }\r
 478         else if (command == 0x0f &&\r
 479                 scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_XEBEC)\r
 480         {\r
 481                 scsiWriteSectorBuffer();\r
 482         }\r
 483         else if (command == 0x3C)\r
 484         {\r
 485                 scsiReadBuffer();\r
 486         }\r
 487         else if (!scsiModeCommand() && !scsiVendorCommand())\r
 488         {\r
 489                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 490                 scsiDev.target->sense.asc = INVALID_COMMAND_OPERATION_CODE;\r
 491                 enter_Status(CHECK_CONDITION);\r
 492         }\r
 493 \r
 494         // Successful\r
 495         if (scsiDev.phase == COMMAND) // No status set, and not in DATA_IN\r
 496         {\r
 497                 enter_Status(GOOD);\r
 498         }\r
 499 \r
 500 }\r
 501 \r
 502 static void doReserveRelease()\r
 503 {\r
 504         int extentReservation = scsiDev.cdb[1] & 1;\r
 505         int thirdPty = scsiDev.cdb[1] & 0x10;\r
 506         int thirdPtyId = (scsiDev.cdb[1] >> 1) & 0x7;\r
 507         uint8_t command = scsiDev.cdb[0];\r
 508 \r
 509         int canRelease =\r
 510                 (!thirdPty && (scsiDev.initiatorId == scsiDev.target->reservedId)) ||\r
 511                         (thirdPty &&\r
 512                                 (scsiDev.target->reserverId == scsiDev.initiatorId) &&\r
 513                                 (scsiDev.target->reservedId == thirdPtyId)\r
 514                         );\r
 515 \r
 516         if (extentReservation)\r
 517         {\r
 518                 // Not supported.\r
 519                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 520                 scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
 521                 enter_Status(CHECK_CONDITION);\r
 522         }\r
 523         else if (command == 0x17) // release\r
 524         {\r
 525                 if ((scsiDev.target->reservedId < 0) || canRelease)\r
 526                 {\r
 527                         scsiDev.target->reservedId = -1;\r
 528                         scsiDev.target->reserverId = -1;\r
 529                 }\r
 530                 else\r
 531                 {\r
 532                         enter_Status(CONFLICT);\r
 533                 }\r
 534         }\r
 535         else // assume reserve.\r
 536         {\r
 537                 if ((scsiDev.target->reservedId < 0) || canRelease)\r
 538                 {\r
 539                         scsiDev.target->reserverId = scsiDev.initiatorId;\r
 540                         if (thirdPty)\r
 541                         {\r
 542                                 scsiDev.target->reservedId = thirdPtyId;\r
 543                         }\r
 544                         else\r
 545                         {\r
 546                                 scsiDev.target->reservedId = scsiDev.initiatorId;\r
 547                         }\r
 548                 }\r
 549                 else\r
 550                 {\r
 551                         // Already reserved by someone else!\r
 552                         enter_Status(CONFLICT);\r
 553                 }\r
 554         }\r
 555 }\r
 556 \r
 557 static uint32_t resetUntil = 0;\r
 558 \r
 559 static void scsiReset()\r
 560 {\r
 561         scsiDev.rstCount++;\r
 562         s2s_ledOff();\r
 563 \r
 564         scsiPhyReset();\r
 565 \r
 566         scsiDev.phase = BUS_FREE;\r
 567         scsiDev.atnFlag = 0;\r
 568         scsiDev.resetFlag = 0;\r
 569         scsiDev.selFlag = 0;\r
 570         scsiDev.lun = -1;\r
 571         scsiDev.compatMode = COMPAT_UNKNOWN;\r
 572 \r
 573         if (scsiDev.target)\r
 574         {\r
 575                 if (scsiDev.target->unitAttention != POWER_ON_RESET)\r
 576                 {\r
 577                         scsiDev.target->unitAttention = SCSI_BUS_RESET;\r
 578                 }\r
 579                 scsiDev.target->reservedId = -1;\r
 580                 scsiDev.target->reserverId = -1;\r
 581                 scsiDev.target->sense.code = NO_SENSE;\r
 582                 scsiDev.target->sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
 583         }\r
 584         scsiDev.target = NULL;\r
 585 \r
 586         for (int i = 0; i < S2S_MAX_TARGETS; ++i)\r
 587         {\r
 588                 scsiDev.targets[i].syncOffset = 0;\r
 589                 scsiDev.targets[i].syncPeriod = 0;\r
 590         }\r
 591         scsiDev.minSyncPeriod = 0;\r
 592 \r
 593         scsiDiskReset();\r
 594 \r
 595         scsiDev.postDataOutHook = NULL;\r
 596 \r
 597         scsiDev.sdUnderrunCount = 0;\r
 598 \r
 599         // Sleep to allow the bus to settle down a bit.\r
 600         // We must be ready again within the "Reset to selection time" of\r
 601         // 250ms.\r
 602         // There is no guarantee that the RST line will be negated by then.\r
 603         // NOTE: We could be connected and powered by USB for configuration,\r
 604         // in which case TERMPWR cannot be supplied, and reset will ALWAYS\r
 605         // be true. Therefore, the sleep here must be slow to avoid slowing\r
 606         // USB comms\r
 607         resetUntil = s2s_getTime_ms() + 2; // At least 1ms.\r
 608 }\r
 609 \r
 610 static void enter_SelectionPhase()\r
 611 {\r
 612         // Ignore stale versions of this flag, but ensure we know the\r
 613         // current value if the flag is still set.\r
 614         scsiDev.atnFlag = 0;\r
 615         scsiDev.dataPtr = 0;\r
 616         scsiDev.savedDataPtr = 0;\r
 617         scsiDev.dataLen = 0;\r
 618         scsiDev.status = GOOD;\r
 619         scsiDev.phase = SELECTION;\r
 620         scsiDev.lun = -1;\r
 621         scsiDev.discPriv = 0;\r
 622 \r
 623         scsiDev.initiatorId = -1;\r
 624         scsiDev.target = NULL;\r
 625 \r
 626         transfer.blocks = 0;\r
 627         transfer.currentBlock = 0;\r
 628 \r
 629         scsiDev.postDataOutHook = NULL;\r
 630 \r
 631         scsiDev.needSyncNegotiationAck = 0;\r
 632 }\r
 633 \r
 634 static void process_SelectionPhase()\r
 635 {\r
 636         // Selection delays.\r
 637         // Many SCSI1 samplers that use a 5380 chip need a delay of at least 1ms.\r
 638         // The Mac Plus boot-time (ie. rom code) selection abort time\r
 639         // is < 1ms and must have no delay (standard suggests 250ms abort time)\r
 640         // Most newer SCSI2 hosts don't care either way.\r
 641         if (scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_XEBEC)\r
 642         {\r
 643                 s2s_delay_ms(1); // Simply won't work if set to 0.\r
 644         }\r
 645         else if (scsiDev.boardCfg.selectionDelay == 255) // auto\r
 646         {\r
 647                 if (scsiDev.compatMode < COMPAT_SCSI2)\r
 648                 {\r
 649                         s2s_delay_ms(1);\r
 650                 }\r
 651         }\r
 652         else if (scsiDev.boardCfg.selectionDelay != 0)\r
 653         {\r
 654                 s2s_delay_ms(scsiDev.boardCfg.selectionDelay);\r
 655         }\r
 656 \r
 657         uint8_t selStatus = *SCSI_STS_SELECTED;\r
 658         if ((selStatus == 0) && (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_SEL_LATCH))\r
 659         {\r
 660                 selStatus = scsiDev.selFlag;\r
 661         }\r
 662 \r
 663         int tgtIndex;\r
 664         TargetState* target = NULL;\r
 665         for (tgtIndex = 0; tgtIndex < S2S_MAX_TARGETS; ++tgtIndex)\r
 666         {\r
 667                 if (scsiDev.targets[tgtIndex].targetId == (selStatus & 7))\r
 668                 {\r
 669                         target = &scsiDev.targets[tgtIndex];\r
 670                         break;\r
 671                 }\r
 672         }\r
 673         if ((target != NULL) && (selStatus & 0x40))\r
 674         {\r
 675                 // We've been selected!\r
 676                 // Assert BSY - Selection success!\r
 677                 // must happen within 200us (Selection abort time) of seeing our\r
 678                 // ID + SEL.\r
 679                 // (Note: the initiator will be waiting the "Selection time-out delay"\r
 680                 // for our BSY response, which is actually a very generous 250ms)\r
 681                 *SCSI_CTRL_BSY = 1;\r
 682                 s2s_ledOn();\r
 683 \r
 684                 scsiDev.target = target;\r
 685 \r
 686                 // Do we enter MESSAGE OUT immediately ? SCSI 1 and 2 standards says\r
 687                 // move to MESSAGE OUT if ATN is true before we assert BSY.\r
 688                 // The initiator should assert ATN with SEL.\r
 689                 scsiDev.atnFlag = selStatus & 0x80;\r
 690 \r
 691 \r
 692                 // Unit attention breaks many older SCSI hosts. Disable it completely\r
 693                 // for SCSI-1 (and older) hosts, regardless of our configured setting.\r
 694                 // Enable the compatability mode also as many SASI and SCSI1\r
 695                 // controllers don't generate parity bits.\r
 696                 if (!scsiDev.atnFlag)\r
 697                 {\r
 698                         target->unitAttention = 0;\r
 699                         scsiDev.compatMode = COMPAT_SCSI1;\r
 700                 }\r
 701                 else if (!(scsiDev.boardCfg.flags & S2S_CFG_ENABLE_SCSI2))\r
 702                 {\r
 703                         scsiDev.compatMode = COMPAT_SCSI2_DISABLED;\r
 704                 }\r
 705                 else\r
 706                 {\r
 707                         scsiDev.compatMode = COMPAT_SCSI2;\r
 708                 }\r
 709 \r
 710                 scsiDev.selCount++;\r
 711 \r
 712 \r
 713                 // Save our initiator now that we're no longer in a time-critical\r
 714                 // section.\r
 715                 // SCSI1/SASI initiators may not set their own ID.\r
 716                 scsiDev.initiatorId = (selStatus >> 3) & 0x7;\r
 717 \r
 718                 // Wait until the end of the selection phase.\r
 719                 uint32_t selTimerBegin = s2s_getTime_ms();\r
 720                 while (likely(!scsiDev.resetFlag))\r
 721                 {\r
 722                         if (!scsiStatusSEL())\r
 723                         {\r
 724                                 break;\r
 725                         }\r
 726                         else if (s2s_elapsedTime_ms(selTimerBegin) >= 10 &&\r
 727                                 scsiDev.target->cfg->quirks == S2S_CFG_QUIRKS_XEBEC)\r
 728                         {\r
 729                                 // XEBEC hosts may not bother releasing SEL at all until\r
 730                                 // just before the command ends.\r
 731                                 break;\r
 732                         }\r
 733                         else if (s2s_elapsedTime_ms(selTimerBegin) >= 250)\r
 734                         {\r
 735                                 *SCSI_CTRL_BSY = 0;\r
 736                                 scsiDev.resetFlag = 1;\r
 737                                 break;\r
 738                         }\r
 739                 }\r
 740 \r
 741                 scsiDev.phase = COMMAND;\r
 742         }\r
 743         else if (!selStatus)\r
 744         {\r
 745                 scsiDev.phase = BUS_BUSY;\r
 746         }\r
 747         scsiDev.selFlag = 0;\r
 748 }\r
 749 \r
 750 static void process_MessageOut()\r
 751 {\r
 752         int wasNeedSyncNegotiationAck = scsiDev.needSyncNegotiationAck;\r
 753         scsiDev.needSyncNegotiationAck = 0; // Successful on -most- messages.\r
 754 \r
 755         scsiEnterPhase(MESSAGE_OUT);\r
 756 \r
 757         scsiDev.atnFlag = 0;\r
 758         scsiDev.msgOut = scsiReadByte();\r
 759         scsiDev.msgCount++;\r
 760 \r
 761         if (scsiParityError() &&\r
 762                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY))\r
 763         {\r
 764                 // Skip the remaining message bytes, and then start the MESSAGE_OUT\r
 765                 // phase again from the start. The initiator will re-send the\r
 766                 // same set of messages.\r
 767                 while (scsiStatusATN() && !scsiDev.resetFlag)\r
 768                 {\r
 769                         scsiReadByte();\r
 770                 }\r
 771 \r
 772                 // Go-back and try the message again.\r
 773                 scsiDev.atnFlag = 1;\r
 774         }\r
 775         else if (scsiDev.msgOut == 0x00)\r
 776         {\r
 777                 // COMMAND COMPLETE. but why would the target be receiving this ? nfi.\r
 778                 enter_BusFree();\r
 779         }\r
 780         else if (scsiDev.msgOut == 0x06)\r
 781         {\r
 782                 // ABORT\r
 783                 scsiDiskReset();\r
 784                 enter_BusFree();\r
 785         }\r
 786         else if (scsiDev.msgOut == 0x0C)\r
 787         {\r
 788                 // BUS DEVICE RESET\r
 789 \r
 790                 scsiDiskReset();\r
 791 \r
 792                 scsiDev.target->unitAttention = SCSI_BUS_RESET;\r
 793 \r
 794                 // ANY initiator can reset the reservation state via this message.\r
 795                 scsiDev.target->reservedId = -1;\r
 796                 scsiDev.target->reserverId = -1;\r
 797 \r
 798                 // Cancel any sync negotiation\r
 799                 scsiDev.target->syncOffset = 0;\r
 800                 scsiDev.target->syncPeriod = 0;\r
 801 \r
 802                 enter_BusFree();\r
 803         }\r
 804         else if (scsiDev.msgOut == 0x05)\r
 805         {\r
 806                 // Initiate Detected Error\r
 807                 // Ignore for now\r
 808         }\r
 809         else if (scsiDev.msgOut == 0x0F)\r
 810         {\r
 811                 // INITIATE RECOVERY\r
 812                 // Ignore for now\r
 813         }\r
 814         else if (scsiDev.msgOut == 0x10)\r
 815         {\r
 816                 // RELEASE RECOVERY\r
 817                 // Ignore for now\r
 818                 enter_BusFree();\r
 819         }\r
 820         else if (scsiDev.msgOut == MSG_REJECT)\r
 821         {\r
 822                 // Message Reject\r
 823                 // Oh well.\r
 824 \r
 825                 if (wasNeedSyncNegotiationAck)\r
 826                 {\r
 827                         scsiDev.target->syncOffset = 0;\r
 828                         scsiDev.target->syncPeriod = 0;\r
 829                 }\r
 830         }\r
 831         else if (scsiDev.msgOut == 0x08)\r
 832         {\r
 833                 // NOP\r
 834         }\r
 835         else if (scsiDev.msgOut == 0x09)\r
 836         {\r
 837                 // Message Parity Error\r
 838                 // Go back and re-send the last message.\r
 839                 scsiDev.phase = MESSAGE_IN;\r
 840 \r
 841                 if (wasNeedSyncNegotiationAck)\r
 842                 {\r
 843                         scsiDev.target->syncOffset = 0;\r
 844                         scsiDev.target->syncPeriod = 0;\r
 845                 }\r
 846         }\r
 847         else if (scsiDev.msgOut & 0x80) // 0x80 -> 0xFF\r
 848         {\r
 849                 // IDENTIFY\r
 850                 if ((scsiDev.msgOut & 0x18) || // Reserved bits set.\r
 851                         (scsiDev.msgOut & 0x20))  // We don't have any target routines!\r
 852                 {\r
 853                         messageReject();\r
 854                 }\r
 855 \r
 856                 scsiDev.lun = scsiDev.msgOut & 0x7;\r
 857                 scsiDev.discPriv = \r
 858                         ((scsiDev.msgOut & 0x40) && (scsiDev.initiatorId >= 0))\r
 859                                 ? 1 : 0;\r
 860         }\r
 861         else if (scsiDev.msgOut >= 0x20 && scsiDev.msgOut <= 0x2F)\r
 862         {\r
 863                 // Two byte message. We don't support these. read and discard.\r
 864                 scsiReadByte();\r
 865 \r
 866                 if (scsiDev.msgOut == 0x23) {\r
 867                         // Ignore Wide Residue. We're only 8 bit anyway.\r
 868                 } else {\r
 869                         messageReject();\r
 870                 }\r
 871         }\r
 872         else if (scsiDev.msgOut == 0x01)\r
 873         {\r
 874                 int i;\r
 875 \r
 876                 // Extended message.\r
 877                 int msgLen = scsiReadByte();\r
 878                 if (msgLen == 0) msgLen = 256;\r
 879                 uint8_t extmsg[256];\r
 880                 for (i = 0; i < msgLen && !scsiDev.resetFlag; ++i)\r
 881                 {\r
 882                         // Discard bytes.\r
 883                         extmsg[i] = scsiReadByte();\r
 884                 }\r
 885 \r
 886                 if (extmsg[0] == 3 && msgLen == 2) // Wide Data Request\r
 887                 {\r
 888                         // Negotiate down to 8bit\r
 889                         scsiEnterPhase(MESSAGE_IN);\r
 890                         static const uint8_t WDTR[] = {0x01, 0x02, 0x03, 0x00};\r
 891                         scsiWrite(WDTR, sizeof(WDTR));\r
 892 \r
 893                         // SDTR becomes invalidated.\r
 894                         scsiDev.target->syncOffset = 0;\r
 895                         scsiDev.target->syncPeriod = 0;\r
 896                 }\r
 897                 else if (extmsg[0] == 1 && msgLen == 3) // Synchronous data request\r
 898                 {\r
 899                         int oldPeriod = scsiDev.target->syncPeriod;\r
 900                         int oldOffset = scsiDev.target->syncOffset;\r
 901 \r
 902                         int transferPeriod = extmsg[1];\r
 903                         int offset = extmsg[2];\r
 904 \r
 905                         if ((\r
 906                                         (transferPeriod > 0) &&\r
 907                                         (transferPeriod < scsiDev.minSyncPeriod)) ||\r
 908                                 (scsiDev.minSyncPeriod == 0))\r
 909                         {\r
 910                                 scsiDev.minSyncPeriod = transferPeriod;\r
 911                         }\r
 912 \r
 913                         if ((transferPeriod > 80) || // 320ns, 3.125MB/s\r
 914                                 // Amiga A590 (WD33C93 chip) only does 3.5MB/s sync\r
 915                                 // After 80 we start to run out of bits in the fpga timing\r
 916                                 // register.\r
 917                                 (transferPeriod == 0) ||\r
 918                                 (offset == 0) ||\r
 919                                 ((scsiDev.boardCfg.scsiSpeed != S2S_CFG_SPEED_NoLimit) &&\r
 920                                         (scsiDev.boardCfg.scsiSpeed <= S2S_CFG_SPEED_ASYNC_50)))\r
 921                         {\r
 922                                 scsiDev.target->syncOffset = 0;\r
 923                                 scsiDev.target->syncPeriod = 0;\r
 924                         } else {\r
 925                                 scsiDev.target->syncOffset = offset <= 15 ? offset : 15;\r
 926                                 // FAST20 / 50ns / 20MHz is disabled for now due to\r
 927                                 // data corruption while reading data. We can count the\r
 928                                 // ACK's correctly, but can't save the data to a register\r
 929                                 // before it changes. (ie. transferPeriod == 12)\r
 930                                 if ((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_TURBO) &&\r
 931                                         (transferPeriod <= 16))\r
 932                                 {\r
 933                                         scsiDev.target->syncPeriod = 16; // 15.6MB/s\r
 934                                 }\r
 935                                 else if (scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_TURBO)\r
 936                                 {\r
 937                                         scsiDev.target->syncPeriod = transferPeriod;\r
 938                                 }\r
 939                                 else if (transferPeriod <= 25 &&\r
 940                                         ((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_NoLimit) ||\r
 941                                                 (scsiDev.boardCfg.scsiSpeed >= S2S_CFG_SPEED_SYNC_10)))\r
 942                                 {\r
 943                                         scsiDev.target->syncPeriod = 25; // 100ns, 10MB/s\r
 944 \r
 945                                 } else if (transferPeriod < 50 &&\r
 946                                         ((scsiDev.boardCfg.scsiSpeed == S2S_CFG_SPEED_NoLimit) ||\r
 947                                                 (scsiDev.boardCfg.scsiSpeed >= S2S_CFG_SPEED_SYNC_10)))\r
 948                                 {\r
 949                                         scsiDev.target->syncPeriod = transferPeriod;\r
 950                                 } else if (transferPeriod >= 50)\r
 951                                 {\r
 952                                         scsiDev.target->syncPeriod = transferPeriod;\r
 953                                 } else {\r
 954                                         scsiDev.target->syncPeriod = 50;\r
 955                                 }\r
 956                         }\r
 957 \r
 958                         if (transferPeriod != oldPeriod ||\r
 959                                 scsiDev.target->syncPeriod != oldPeriod ||\r
 960                                 offset != oldOffset ||\r
 961                                 scsiDev.target->syncOffset != oldOffset ||\r
 962                                 !wasNeedSyncNegotiationAck) // Don't get into infinite loops negotiating.\r
 963                         {\r
 964                                 scsiEnterPhase(MESSAGE_IN);\r
 965                                 uint8_t SDTR[] = {0x01, 0x03, 0x01, scsiDev.target->syncPeriod, scsiDev.target->syncOffset};\r
 966                                 scsiWrite(SDTR, sizeof(SDTR));\r
 967                                 scsiDev.needSyncNegotiationAck = 1; // Check if this message is rejected.\r
 968                                 scsiDev.sdUnderrunCount = 0;  // reset counter, may work now.\r
 969                         }\r
 970                 }\r
 971                 else\r
 972                 {\r
 973                         // Not supported\r
 974                         messageReject();\r
 975                 }\r
 976         }\r
 977         else\r
 978         {\r
 979                 messageReject();\r
 980         }\r
 981 \r
 982         // Re-check the ATN flag in case it stays asserted.\r
 983         scsiDev.atnFlag |= scsiStatusATN();\r
 984 \r
 985         if (!scsiDev.atnFlag)\r
 986         {\r
 987                 // Message wasn't rejected!\r
 988                 scsiDev.needSyncNegotiationAck = 0;\r
 989         }\r
 990 }\r
 991 \r
 992 void scsiPoll(void)\r
 993 {\r
 994         if (resetUntil != 0 && resetUntil > s2s_getTime_ms())\r
 995         {\r
 996                 return;\r
 997         }\r
 998         resetUntil = 0;\r
 999 \r
1000         if (unlikely(scsiDev.resetFlag))\r
1001         {\r
1002                 scsiReset();\r
1003                 // Still in reset phase for a few ms.\r
1004                 // Do not try and process any commands.\r
1005                 return;\r
1006         }\r
1007 \r
1008         switch (scsiDev.phase)\r
1009         {\r
1010         case BUS_FREE:\r
1011                 if (scsiStatusBSY())\r
1012                 {\r
1013                         scsiDev.phase = BUS_BUSY;\r
1014                 }\r
1015                 // The Arbitration phase is optional for SCSI1/SASI hosts if there is only\r
1016                 // one initiator in the chain. Support this by moving\r
1017                 // straight to selection if SEL is asserted.\r
1018                 // ie. the initiator won't assert BSY and it's own ID before moving to selection.\r
1019                 else if (scsiDev.selFlag || *SCSI_STS_SELECTED)\r
1020                 {\r
1021                         enter_SelectionPhase();\r
1022                 }\r
1023         break;\r
1024 \r
1025         case BUS_BUSY:\r
1026                 // Someone is using the bus. Perhaps they are trying to\r
1027                 // select us.\r
1028                 if (scsiDev.selFlag || *SCSI_STS_SELECTED)\r
1029                 {\r
1030                         enter_SelectionPhase();\r
1031                 }\r
1032                 else if (!scsiStatusBSY())\r
1033                 {\r
1034                         scsiDev.phase = BUS_FREE;\r
1035                 }\r
1036         break;\r
1037 \r
1038         case ARBITRATION:\r
1039                 // TODO Support reselection.\r
1040                 break;\r
1041 \r
1042         case SELECTION:\r
1043                 process_SelectionPhase();\r
1044         break;\r
1045 \r
1046         case RESELECTION:\r
1047                 // Not currently supported!\r
1048         break;\r
1049 \r
1050         case COMMAND:\r
1051                 // Do not check ATN here. SCSI 1 & 2 initiators must set ATN\r
1052                 // and SEL together upon entering the selection phase if they\r
1053                 // want to send a message (IDENTIFY) immediately.\r
1054                 if (scsiDev.atnFlag)\r
1055                 {\r
1056                         process_MessageOut();\r
1057                 }\r
1058                 else\r
1059                 {\r
1060                         process_Command();\r
1061                 }\r
1062         break;\r
1063 \r
1064         case DATA_IN:\r
1065                 scsiDev.atnFlag |= scsiStatusATN();\r
1066                 if (scsiDev.atnFlag)\r
1067                 {\r
1068                         process_MessageOut();\r
1069                 }\r
1070                 else\r
1071                 {\r
1072                         process_DataIn();\r
1073                 }\r
1074         break;\r
1075 \r
1076         case DATA_OUT:\r
1077                 scsiDev.atnFlag |= scsiStatusATN();\r
1078                 if (scsiDev.atnFlag)\r
1079                 {\r
1080                         process_MessageOut();\r
1081                 }\r
1082                 else\r
1083                 {\r
1084                         process_DataOut();\r
1085                 }\r
1086         break;\r
1087 \r
1088         case STATUS:\r
1089                 scsiDev.atnFlag |= scsiStatusATN();\r
1090                 if (scsiDev.atnFlag)\r
1091                 {\r
1092                         process_MessageOut();\r
1093                 }\r
1094                 else\r
1095                 {\r
1096                         process_Status();\r
1097                 }\r
1098         break;\r
1099 \r
1100         case MESSAGE_IN:\r
1101                 scsiDev.atnFlag |= scsiStatusATN();\r
1102                 if (scsiDev.atnFlag)\r
1103                 {\r
1104                         process_MessageOut();\r
1105                 }\r
1106                 else\r
1107                 {\r
1108                         process_MessageIn(1);\r
1109                 }\r
1110 \r
1111         break;\r
1112 \r
1113         case MESSAGE_OUT:\r
1114                 process_MessageOut();\r
1115         break;\r
1116         }\r
1117 }\r
1118 \r
1119 void scsiInit()\r
1120 {\r
1121         static int firstInit = 1;\r
1122 \r
1123         scsiDev.atnFlag = 0;\r
1124         scsiDev.resetFlag = 1;\r
1125         scsiDev.selFlag = 0;\r
1126         scsiDev.phase = BUS_FREE;\r
1127         scsiDev.target = NULL;\r
1128         scsiDev.compatMode = COMPAT_UNKNOWN;\r
1129 \r
1130         int i;\r
1131         for (i = 0; i < S2S_MAX_TARGETS; ++i)\r
1132         {\r
1133                 const S2S_TargetCfg* cfg = s2s_getConfigByIndex(i);\r
1134                 if (cfg && (cfg->scsiId & S2S_CFG_TARGET_ENABLED))\r
1135                 {\r
1136                         scsiDev.targets[i].targetId = cfg->scsiId & S2S_CFG_TARGET_ID_BITS;\r
1137                         scsiDev.targets[i].cfg = cfg;\r
1138 \r
1139                         scsiDev.targets[i].liveCfg.bytesPerSector = cfg->bytesPerSector;\r
1140                 }\r
1141                 else\r
1142                 {\r
1143                         scsiDev.targets[i].targetId = 0xff;\r
1144                         scsiDev.targets[i].cfg = NULL;\r
1145                 }\r
1146                 scsiDev.targets[i].reservedId = -1;\r
1147                 scsiDev.targets[i].reserverId = -1;\r
1148                 if (firstInit)\r
1149                 {\r
1150                         scsiDev.targets[i].unitAttention = POWER_ON_RESET;\r
1151                 }\r
1152                 else\r
1153                 {\r
1154                         scsiDev.targets[i].unitAttention = PARAMETERS_CHANGED;\r
1155                 }\r
1156                 scsiDev.targets[i].sense.code = NO_SENSE;\r
1157                 scsiDev.targets[i].sense.asc = NO_ADDITIONAL_SENSE_INFORMATION;\r
1158 \r
1159                 scsiDev.targets[i].syncOffset = 0;\r
1160                 scsiDev.targets[i].syncPeriod = 0;\r
1161         }\r
1162         firstInit = 0;\r
1163 }\r
1164 \r
1165 /* TODO REENABLE\r
1166 void scsiDisconnect()\r
1167 {\r
1168         scsiEnterPhase(MESSAGE_IN);\r
1169         scsiWriteByte(0x02); // save data pointer\r
1170         scsiWriteByte(0x04); // disconnect msg.\r
1171 \r
1172         // For now, the caller is responsible for tracking the disconnected\r
1173         // state, and calling scsiReconnect.\r
1174         // Ideally the client would exit their loop and we'd implement this\r
1175         // as part of scsiPoll\r
1176         int phase = scsiDev.phase;\r
1177         enter_BusFree();\r
1178         scsiDev.phase = phase;\r
1179 }\r
1180 */\r
1181 \r
1182 /* TODO REENABLE\r
1183 int scsiReconnect()\r
1184 {\r
1185         int reconnected = 0;\r
1186 \r
1187         int sel = SCSI_ReadFilt(SCSI_Filt_SEL);\r
1188         int bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1189         if (!sel && !bsy)\r
1190         {\r
1191                 s2s_delay_us(1);\r
1192                 sel = SCSI_ReadFilt(SCSI_Filt_SEL);\r
1193                 bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1194         }\r
1195 \r
1196         if (!sel && !bsy)\r
1197         {\r
1198                 // Arbitrate.\r
1199                 s2s_ledOn();\r
1200                 uint8_t scsiIdMask = 1 << scsiDev.target->targetId;\r
1201                 SCSI_Out_Bits_Write(scsiIdMask);\r
1202                 SCSI_Out_Ctl_Write(1); // Write bits manually.\r
1203                 SCSI_SetPin(SCSI_Out_BSY);\r
1204 \r
1205                 s2s_delay_us(3); // arbitrate delay. 2.4us.\r
1206 \r
1207                 uint8_t dbx = scsiReadDBxPins();\r
1208                 sel = SCSI_ReadFilt(SCSI_Filt_SEL);\r
1209                 if (sel || ((dbx ^ scsiIdMask) > scsiIdMask))\r
1210                 {\r
1211                         // Lost arbitration.\r
1212                         SCSI_Out_Ctl_Write(0);\r
1213                         SCSI_ClearPin(SCSI_Out_BSY);\r
1214                         s2s_ledOff();\r
1215                 }\r
1216                 else\r
1217                 {\r
1218                         // Won arbitration\r
1219                         SCSI_SetPin(SCSI_Out_SEL);\r
1220                         s2s_delay_us(1); // Bus clear + Bus settle.\r
1221 \r
1222                         // Reselection phase\r
1223                         SCSI_CTL_PHASE_Write(__scsiphase_io);\r
1224                         SCSI_Out_Bits_Write(scsiIdMask | (1 << scsiDev.initiatorId));\r
1225                         scsiDeskewDelay(); // 2 deskew delays\r
1226                         scsiDeskewDelay(); // 2 deskew delays\r
1227                         SCSI_ClearPin(SCSI_Out_BSY);\r
1228                         s2s_delay_us(1);  // Bus Settle Delay\r
1229 \r
1230                         uint32_t waitStart_ms = getTime_ms();\r
1231                         bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1232                         // Wait for initiator.\r
1233                         while (\r
1234                                 !bsy &&\r
1235                                 !scsiDev.resetFlag &&\r
1236                                 (elapsedTime_ms(waitStart_ms) < 250))\r
1237                         {\r
1238                                 bsy = SCSI_ReadFilt(SCSI_Filt_BSY);\r
1239                         }\r
1240 \r
1241                         if (bsy)\r
1242                         {\r
1243                                 SCSI_SetPin(SCSI_Out_BSY);\r
1244                                 scsiDeskewDelay(); // 2 deskew delays\r
1245                                 scsiDeskewDelay(); // 2 deskew delays\r
1246                                 SCSI_ClearPin(SCSI_Out_SEL);\r
1247 \r
1248                                 // Prepare for the initial IDENTIFY message.\r
1249                                 SCSI_Out_Ctl_Write(0);\r
1250                                 scsiEnterPhase(MESSAGE_IN);\r
1251 \r
1252                                 // Send identify command\r
1253                                 scsiWriteByte(0x80);\r
1254 \r
1255                                 scsiEnterPhase(scsiDev.phase);\r
1256                                 reconnected = 1;\r
1257                         }\r
1258                         else\r
1259                         {\r
1260                                 // reselect timeout.\r
1261                                 SCSI_Out_Ctl_Write(0);\r
1262                                 SCSI_ClearPin(SCSI_Out_SEL);\r
1263                                 SCSI_CTL_PHASE_Write(0);\r
1264                                 s2s_ledOff();\r
1265                         }\r
1266                 }\r
1267         }\r
1268         return reconnected;\r
1269 }\r
1270 */\r
1271 \r