src/firmware/disk.c

   1 //      Copyright (C) 2013 Michael McMaster <michael@codesrc.com>\r
   2 //      Copyright (C) 2014 Doug Brown <doug@downtowndougbrown.com>\r
   3 //\r
   4 //      This file is part of SCSI2SD.\r
   5 //\r
   6 //      SCSI2SD is free software: you can redistribute it and/or modify\r
   7 //      it under the terms of the GNU General Public License as published by\r
   8 //      the Free Software Foundation, either version 3 of the License, or\r
   9 //      (at your option) any later version.\r
  10 //\r
  11 //      SCSI2SD is distributed in the hope that it will be useful,\r
  12 //      but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 //      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 //      GNU General Public License for more details.\r
  15 //\r
  16 //      You should have received a copy of the GNU General Public License\r
  17 //      along with SCSI2SD.  If not, see <http://www.gnu.org/licenses/>.\r
  18 \r
  19 #include "scsi.h"\r
  20 #include "scsiPhy.h"\r
  21 #include "config.h"\r
  22 #include "debug.h"\r
  23 #include "disk.h"\r
  24 #include "sd.h"\r
  25 #include "time.h"\r
  26 \r
  27 #include <string.h>\r
  28 \r
  29 // Global\r
  30 BlockDevice blockDev;\r
  31 Transfer transfer;\r
  32 \r
  33 static int doSdInit()\r
  34 {\r
  35         int result = 0;\r
  36         if (blockDev.state & DISK_PRESENT)\r
  37         {\r
  38                 blockDev.state = blockDev.state | DISK_INITIALISED;\r
  39         }\r
  40         return result;\r
  41 }\r
  42 \r
  43 // Callback once all data has been read in the data out phase.\r
  44 static void doFormatUnitComplete(void)\r
  45 {\r
  46         // TODO start writing the initialisation pattern to the SD\r
  47         // card\r
  48         scsiDev.phase = STATUS;\r
  49 }\r
  50 \r
  51 static void doFormatUnitSkipData(int bytes)\r
  52 {\r
  53         // We may not have enough memory to store the initialisation pattern and\r
  54         // defect list data.  Since we're not making use of it yet anyway, just\r
  55         // discard the bytes.\r
  56         scsiEnterPhase(DATA_OUT);\r
  57         int i;\r
  58         for (i = 0; i < bytes; ++i)\r
  59         {\r
  60                 scsiReadByte();\r
  61         }\r
  62 }\r
  63 \r
  64 // Callback from the data out phase.\r
  65 static void doFormatUnitPatternHeader(void)\r
  66 {\r
  67         int defectLength =\r
  68                 ((((uint16_t)scsiDev.data[2])) << 8) +\r
  69                         scsiDev.data[3];\r
  70 \r
  71         int patternLength =\r
  72                 ((((uint16_t)scsiDev.data[4 + 2])) << 8) +\r
  73                 scsiDev.data[4 + 3];\r
  74 \r
  75                 doFormatUnitSkipData(defectLength + patternLength);\r
  76                 doFormatUnitComplete();\r
  77 }\r
  78 \r
  79 // Callback from the data out phase.\r
  80 static void doFormatUnitHeader(void)\r
  81 {\r
  82         int IP = (scsiDev.data[1] & 0x08) ? 1 : 0;\r
  83         int DSP = (scsiDev.data[1] & 0x04) ? 1 : 0;\r
  84 \r
  85         if (! DSP) // disable save parameters\r
  86         {\r
  87                 // Save the "MODE SELECT savable parameters"\r
  88                 s2s_configSave(\r
  89                         scsiDev.target->targetId,\r
  90                         scsiDev.target->liveCfg.bytesPerSector);\r
  91         }\r
  92 \r
  93         if (IP)\r
  94         {\r
  95                 // We need to read the initialisation pattern header first.\r
  96                 scsiDev.dataLen += 4;\r
  97                 scsiDev.phase = DATA_OUT;\r
  98                 scsiDev.postDataOutHook = doFormatUnitPatternHeader;\r
  99         }\r
 100         else\r
 101         {\r
 102                 // Read the defect list data\r
 103                 int defectLength =\r
 104                         ((((uint16_t)scsiDev.data[2])) << 8) +\r
 105                         scsiDev.data[3];\r
 106                 doFormatUnitSkipData(defectLength);\r
 107                 doFormatUnitComplete();\r
 108         }\r
 109 }\r
 110 \r
 111 static void doReadCapacity()\r
 112 {\r
 113         uint32_t lba = (((uint32_t) scsiDev.cdb[2]) << 24) +\r
 114                 (((uint32_t) scsiDev.cdb[3]) << 16) +\r
 115                 (((uint32_t) scsiDev.cdb[4]) << 8) +\r
 116                 scsiDev.cdb[5];\r
 117         int pmi = scsiDev.cdb[8] & 1;\r
 118 \r
 119         uint32_t capacity = getScsiCapacity(\r
 120                 scsiDev.target->cfg->sdSectorStart,\r
 121                 scsiDev.target->liveCfg.bytesPerSector,\r
 122                 scsiDev.target->cfg->scsiSectors);\r
 123 \r
 124         if (!pmi && lba)\r
 125         {\r
 126                 // error.\r
 127                 // We don't do anything with the "partial medium indicator", and\r
 128                 // assume that delays are constant across each block. But the spec\r
 129                 // says we must return this error if pmi is specified incorrectly.\r
 130                 scsiDev.status = CHECK_CONDITION;\r
 131                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 132                 scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
 133                 scsiDev.phase = STATUS;\r
 134         }\r
 135         else if (capacity > 0)\r
 136         {\r
 137                 uint32_t highestBlock = capacity - 1;\r
 138 \r
 139                 scsiDev.data[0] = highestBlock >> 24;\r
 140                 scsiDev.data[1] = highestBlock >> 16;\r
 141                 scsiDev.data[2] = highestBlock >> 8;\r
 142                 scsiDev.data[3] = highestBlock;\r
 143 \r
 144                 uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
 145                 scsiDev.data[4] = bytesPerSector >> 24;\r
 146                 scsiDev.data[5] = bytesPerSector >> 16;\r
 147                 scsiDev.data[6] = bytesPerSector >> 8;\r
 148                 scsiDev.data[7] = bytesPerSector;\r
 149                 scsiDev.dataLen = 8;\r
 150                 scsiDev.phase = DATA_IN;\r
 151         }\r
 152         else\r
 153         {\r
 154                 scsiDev.status = CHECK_CONDITION;\r
 155                 scsiDev.target->sense.code = NOT_READY;\r
 156                 scsiDev.target->sense.asc = MEDIUM_NOT_PRESENT;\r
 157                 scsiDev.phase = STATUS;\r
 158         }\r
 159 }\r
 160 \r
 161 static void doWrite(uint32_t lba, uint32_t blocks)\r
 162 {\r
 163         if (unlikely(scsiDev.target->cfg->deviceType == S2S_CFG_FLOPPY_14MB)) {\r
 164                 // Floppies are supposed to be slow. Some systems can't handle a floppy\r
 165                 // without an access time\r
 166                 s2s_delay_ms(10);\r
 167         }\r
 168 \r
 169         uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
 170 \r
 171         if (unlikely(blockDev.state & DISK_WP) ||\r
 172                 unlikely(scsiDev.target->cfg->deviceType == S2S_CFG_OPTICAL))\r
 173 \r
 174         {\r
 175                 scsiDev.status = CHECK_CONDITION;\r
 176                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 177                 scsiDev.target->sense.asc = WRITE_PROTECTED;\r
 178                 scsiDev.phase = STATUS;\r
 179         }\r
 180         else if (unlikely(((uint64_t) lba) + blocks >\r
 181                 getScsiCapacity(\r
 182                         scsiDev.target->cfg->sdSectorStart,\r
 183                         bytesPerSector,\r
 184                         scsiDev.target->cfg->scsiSectors\r
 185                         )\r
 186                 ))\r
 187         {\r
 188                 scsiDev.status = CHECK_CONDITION;\r
 189                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 190                 scsiDev.target->sense.asc = LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;\r
 191                 scsiDev.phase = STATUS;\r
 192         }\r
 193         else\r
 194         {\r
 195                 transfer.lba = lba;\r
 196                 transfer.blocks = blocks;\r
 197                 transfer.currentBlock = 0;\r
 198                 scsiDev.phase = DATA_OUT;\r
 199                 scsiDev.dataLen = bytesPerSector;\r
 200                 scsiDev.dataPtr = bytesPerSector;\r
 201 \r
 202                 // No need for single-block writes atm.  Overhead of the\r
 203                 // multi-block write is minimal.\r
 204                 transfer.multiBlock = 1;\r
 205 \r
 206 \r
 207                 // TODO uint32_t sdLBA =\r
 208 // TODO                         SCSISector2SD(\r
 209         // TODO                         scsiDev.target->cfg->sdSectorStart,\r
 210                 // TODO                 bytesPerSector,\r
 211                         // TODO         lba);\r
 212                 // TODO uint32_t sdBlocks = blocks * SDSectorsPerSCSISector(bytesPerSector);\r
 213                 // TODO sdWriteMultiSectorPrep(sdLBA, sdBlocks);\r
 214         }\r
 215 }\r
 216 \r
 217 \r
 218 static void doRead(uint32_t lba, uint32_t blocks)\r
 219 {\r
 220         if (unlikely(scsiDev.target->cfg->deviceType == S2S_CFG_FLOPPY_14MB)) {\r
 221                 // Floppies are supposed to be slow. Some systems can't handle a floppy\r
 222                 // without an access time\r
 223                 s2s_delay_ms(10);\r
 224         }\r
 225 \r
 226         uint32_t capacity = getScsiCapacity(\r
 227                 scsiDev.target->cfg->sdSectorStart,\r
 228                 scsiDev.target->liveCfg.bytesPerSector,\r
 229                 scsiDev.target->cfg->scsiSectors);\r
 230         if (unlikely(((uint64_t) lba) + blocks > capacity))\r
 231         {\r
 232                 scsiDev.status = CHECK_CONDITION;\r
 233                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 234                 scsiDev.target->sense.asc = LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;\r
 235                 scsiDev.phase = STATUS;\r
 236         }\r
 237         else\r
 238         {\r
 239                 transfer.lba = lba;\r
 240                 transfer.blocks = blocks;\r
 241                 transfer.currentBlock = 0;\r
 242                 scsiDev.phase = DATA_IN;\r
 243                 scsiDev.dataLen = 0; // No data yet\r
 244 \r
 245                 uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
 246                 uint32_t sdSectorPerSCSISector = SDSectorsPerSCSISector(bytesPerSector);\r
 247                 uint32_t sdSectors =\r
 248                         blocks * sdSectorPerSCSISector;\r
 249 \r
 250                 if ((\r
 251                                 (sdSectors == 1) &&\r
 252                                 !(scsiDev.boardCfg.flags & S2S_CFG_ENABLE_CACHE)\r
 253                         ) ||\r
 254                         unlikely(((uint64_t) lba) + blocks == capacity)\r
 255                         )\r
 256                 {\r
 257                         // We get errors on reading the last sector using a multi-sector\r
 258                         // read :-(\r
 259                         transfer.multiBlock = 0;\r
 260                 }\r
 261                 else\r
 262                 {\r
 263                         transfer.multiBlock = 1;\r
 264 \r
 265                         // uint32_t sdLBA =\r
 266                                 // SCSISector2SD(\r
 267                                         // scsiDev.target->cfg->sdSectorStart,\r
 268                                         // bytesPerSector,\r
 269                                         // lba);\r
 270 \r
 271                         // TODO sdReadMultiSectorPrep(sdLBA, sdSectors);\r
 272                 }\r
 273         }\r
 274 }\r
 275 \r
 276 static void doSeek(uint32_t lba)\r
 277 {\r
 278         if (lba >=\r
 279                 getScsiCapacity(\r
 280                         scsiDev.target->cfg->sdSectorStart,\r
 281                         scsiDev.target->liveCfg.bytesPerSector,\r
 282                         scsiDev.target->cfg->scsiSectors)\r
 283                 )\r
 284         {\r
 285                 scsiDev.status = CHECK_CONDITION;\r
 286                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 287                 scsiDev.target->sense.asc = LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;\r
 288                 scsiDev.phase = STATUS;\r
 289         }\r
 290 }\r
 291 \r
 292 static int doTestUnitReady()\r
 293 {\r
 294         int ready = 1;\r
 295         if (likely(blockDev.state == (DISK_STARTED | DISK_PRESENT | DISK_INITIALISED)))\r
 296         {\r
 297                 // nothing to do.\r
 298         }\r
 299         else if (unlikely(!(blockDev.state & DISK_STARTED)))\r
 300         {\r
 301                 ready = 0;\r
 302                 scsiDev.status = CHECK_CONDITION;\r
 303                 scsiDev.target->sense.code = NOT_READY;\r
 304                 scsiDev.target->sense.asc = LOGICAL_UNIT_NOT_READY_INITIALIZING_COMMAND_REQUIRED;\r
 305                 scsiDev.phase = STATUS;\r
 306         }\r
 307         else if (unlikely(!(blockDev.state & DISK_PRESENT)))\r
 308         {\r
 309                 ready = 0;\r
 310                 scsiDev.status = CHECK_CONDITION;\r
 311                 scsiDev.target->sense.code = NOT_READY;\r
 312                 scsiDev.target->sense.asc = MEDIUM_NOT_PRESENT;\r
 313                 scsiDev.phase = STATUS;\r
 314         }\r
 315         else if (unlikely(!(blockDev.state & DISK_INITIALISED)))\r
 316         {\r
 317                 ready = 0;\r
 318                 scsiDev.status = CHECK_CONDITION;\r
 319                 scsiDev.target->sense.code = NOT_READY;\r
 320                 scsiDev.target->sense.asc = LOGICAL_UNIT_NOT_READY_CAUSE_NOT_REPORTABLE;\r
 321                 scsiDev.phase = STATUS;\r
 322         }\r
 323         return ready;\r
 324 }\r
 325 \r
 326 // Handle direct-access scsi device commands\r
 327 int scsiDiskCommand()\r
 328 {\r
 329         int commandHandled = 1;\r
 330 \r
 331         uint8_t command = scsiDev.cdb[0];\r
 332         if (unlikely(command == 0x1B))\r
 333         {\r
 334                 // START STOP UNIT\r
 335                 // Enable or disable media access operations.\r
 336                 // Ignore load/eject requests. We can't do that.\r
 337                 //int immed = scsiDev.cdb[1] & 1;\r
 338                 int start = scsiDev.cdb[4] & 1;\r
 339 \r
 340                 if (start)\r
 341                 {\r
 342                         blockDev.state = blockDev.state | DISK_STARTED;\r
 343                         if (!(blockDev.state & DISK_INITIALISED))\r
 344                         {\r
 345                                 doSdInit();\r
 346                         }\r
 347                 }\r
 348                 else\r
 349                 {\r
 350                         blockDev.state &= ~DISK_STARTED;\r
 351                 }\r
 352         }\r
 353         else if (unlikely(command == 0x00))\r
 354         {\r
 355                 // TEST UNIT READY\r
 356                 doTestUnitReady();\r
 357         }\r
 358         else if (unlikely(!doTestUnitReady()))\r
 359         {\r
 360                 // Status and sense codes already set by doTestUnitReady\r
 361         }\r
 362         else if (likely(command == 0x08))\r
 363         {\r
 364                 // READ(6)\r
 365                 uint32_t lba =\r
 366                         (((uint32_t) scsiDev.cdb[1] & 0x1F) << 16) +\r
 367                         (((uint32_t) scsiDev.cdb[2]) << 8) +\r
 368                         scsiDev.cdb[3];\r
 369                 uint32_t blocks = scsiDev.cdb[4];\r
 370                 if (unlikely(blocks == 0)) blocks = 256;\r
 371                 doRead(lba, blocks);\r
 372         }\r
 373         else if (likely(command == 0x28))\r
 374         {\r
 375                 // READ(10)\r
 376                 // Ignore all cache control bits - we don't support a memory cache.\r
 377 \r
 378                 uint32_t lba =\r
 379                         (((uint32_t) scsiDev.cdb[2]) << 24) +\r
 380                         (((uint32_t) scsiDev.cdb[3]) << 16) +\r
 381                         (((uint32_t) scsiDev.cdb[4]) << 8) +\r
 382                         scsiDev.cdb[5];\r
 383                 uint32_t blocks =\r
 384                         (((uint32_t) scsiDev.cdb[7]) << 8) +\r
 385                         scsiDev.cdb[8];\r
 386 \r
 387                 doRead(lba, blocks);\r
 388         }\r
 389         else if (likely(command == 0x0A))\r
 390         {\r
 391                 // WRITE(6)\r
 392                 uint32_t lba =\r
 393                         (((uint32_t) scsiDev.cdb[1] & 0x1F) << 16) +\r
 394                         (((uint32_t) scsiDev.cdb[2]) << 8) +\r
 395                         scsiDev.cdb[3];\r
 396                 uint32_t blocks = scsiDev.cdb[4];\r
 397                 if (unlikely(blocks == 0)) blocks = 256;\r
 398                 doWrite(lba, blocks);\r
 399         }\r
 400         else if (likely(command == 0x2A) || // WRITE(10)\r
 401                 unlikely(command == 0x2E)) // WRITE AND VERIFY\r
 402         {\r
 403                 // Ignore all cache control bits - we don't support a memory cache.\r
 404                 // Don't bother verifying either. The SD card likely stores ECC\r
 405                 // along with each flash row.\r
 406 \r
 407                 uint32_t lba =\r
 408                         (((uint32_t) scsiDev.cdb[2]) << 24) +\r
 409                         (((uint32_t) scsiDev.cdb[3]) << 16) +\r
 410                         (((uint32_t) scsiDev.cdb[4]) << 8) +\r
 411                         scsiDev.cdb[5];\r
 412                 uint32_t blocks =\r
 413                         (((uint32_t) scsiDev.cdb[7]) << 8) +\r
 414                         scsiDev.cdb[8];\r
 415 \r
 416                 doWrite(lba, blocks);\r
 417         }\r
 418         else if (unlikely(command == 0x04))\r
 419         {\r
 420                 // FORMAT UNIT\r
 421                 // We don't really do any formatting, but we need to read the correct\r
 422                 // number of bytes in the DATA_OUT phase to make the SCSI host happy.\r
 423 \r
 424                 int fmtData = (scsiDev.cdb[1] & 0x10) ? 1 : 0;\r
 425                 if (fmtData)\r
 426                 {\r
 427                         // We need to read the parameter list, but we don't know how\r
 428                         // big it is yet. Start with the header.\r
 429                         scsiDev.dataLen = 4;\r
 430                         scsiDev.phase = DATA_OUT;\r
 431                         scsiDev.postDataOutHook = doFormatUnitHeader;\r
 432                 }\r
 433                 else\r
 434                 {\r
 435                         // No data to read, we're already finished!\r
 436                 }\r
 437         }\r
 438         else if (unlikely(command == 0x25))\r
 439         {\r
 440                 // READ CAPACITY\r
 441                 doReadCapacity();\r
 442         }\r
 443         else if (unlikely(command == 0x0B))\r
 444         {\r
 445                 // SEEK(6)\r
 446                 uint32_t lba =\r
 447                         (((uint32_t) scsiDev.cdb[1] & 0x1F) << 16) +\r
 448                         (((uint32_t) scsiDev.cdb[2]) << 8) +\r
 449                         scsiDev.cdb[3];\r
 450 \r
 451                 doSeek(lba);\r
 452         }\r
 453 \r
 454         else if (unlikely(command == 0x2B))\r
 455         {\r
 456                 // SEEK(10)\r
 457                 uint32_t lba =\r
 458                         (((uint32_t) scsiDev.cdb[2]) << 24) +\r
 459                         (((uint32_t) scsiDev.cdb[3]) << 16) +\r
 460                         (((uint32_t) scsiDev.cdb[4]) << 8) +\r
 461                         scsiDev.cdb[5];\r
 462 \r
 463                 doSeek(lba);\r
 464         }\r
 465         else if (unlikely(command == 0x36))\r
 466         {\r
 467                 // LOCK UNLOCK CACHE\r
 468                 // We don't have a cache to lock data into. do nothing.\r
 469         }\r
 470         else if (unlikely(command == 0x34))\r
 471         {\r
 472                 // PRE-FETCH.\r
 473                 // We don't have a cache to pre-fetch into. do nothing.\r
 474         }\r
 475         else if (unlikely(command == 0x1E))\r
 476         {\r
 477                 // PREVENT ALLOW MEDIUM REMOVAL\r
 478                 // Not much we can do to prevent the user removing the SD card.\r
 479                 // do nothing.\r
 480         }\r
 481         else if (unlikely(command == 0x01))\r
 482         {\r
 483                 // REZERO UNIT\r
 484                 // Set the lun to a vendor-specific state. Ignore.\r
 485         }\r
 486         else if (unlikely(command == 0x35))\r
 487         {\r
 488                 // SYNCHRONIZE CACHE\r
 489                 // We don't have a cache. do nothing.\r
 490         }\r
 491         else if (unlikely(command == 0x2F))\r
 492         {\r
 493                 // VERIFY\r
 494                 // TODO: When they supply data to verify, we should read the data and\r
 495                 // verify it. If they don't supply any data, just say success.\r
 496                 if ((scsiDev.cdb[1] & 0x02) == 0)\r
 497                 {\r
 498                         // They are asking us to do a medium verification with no data\r
 499                         // comparison. Assume success, do nothing.\r
 500                 }\r
 501                 else\r
 502                 {\r
 503                         // TODO. This means they are supplying data to verify against.\r
 504                         // Technically we should probably grab the data and compare it.\r
 505                         scsiDev.status = CHECK_CONDITION;\r
 506                         scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
 507                         scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
 508                         scsiDev.phase = STATUS;\r
 509                 }\r
 510         }\r
 511         else if (unlikely(command == 0x37))\r
 512         {\r
 513                 // READ DEFECT DATA\r
 514                 scsiDev.status = CHECK_CONDITION;\r
 515                 scsiDev.target->sense.code = NO_SENSE;\r
 516                 scsiDev.target->sense.asc = DEFECT_LIST_NOT_FOUND;\r
 517                 scsiDev.phase = STATUS;\r
 518 \r
 519         }\r
 520         else\r
 521         {\r
 522                 commandHandled = 0;\r
 523         }\r
 524 \r
 525         return commandHandled;\r
 526 }\r
 527 \r
 528 void scsiDiskPoll()\r
 529 {\r
 530         uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
 531 \r
 532         if (scsiDev.phase == DATA_IN &&\r
 533                 transfer.currentBlock != transfer.blocks)\r
 534         {\r
 535                 scsiEnterPhase(DATA_IN);\r
 536 \r
 537                 int totalSDSectors =\r
 538                         transfer.blocks * SDSectorsPerSCSISector(bytesPerSector);\r
 539                 uint32_t sdLBA =\r
 540                         SCSISector2SD(\r
 541                                 scsiDev.target->cfg->sdSectorStart,\r
 542                                 bytesPerSector,\r
 543                                 transfer.lba);\r
 544 \r
 545                 const int sdPerScsi = SDSectorsPerSCSISector(bytesPerSector);\r
 546                 int buffers = sizeof(scsiDev.data) / SD_SECTOR_SIZE;\r
 547                 int prep = 0;\r
 548                 int i = 0;\r
 549                 int scsiActive = 0;\r
 550                 // int sdActive = 0;\r
 551                 while ((i < totalSDSectors) &&\r
 552                         likely(scsiDev.phase == DATA_IN) &&\r
 553                         likely(!scsiDev.resetFlag))\r
 554                 {\r
 555                         // Wait for the next DMA interrupt. It's beneficial to halt the\r
 556                         // processor to give the DMA controller more memory bandwidth to\r
 557                         // work with.\r
 558 #if 0\r
 559                         int scsiBusy = 1;\r
 560                         int sdBusy = 1;\r
 561                         while (scsiBusy && sdBusy)\r
 562                         {\r
 563                                 uint8_t intr = CyEnterCriticalSection();\r
 564                                 scsiBusy = scsiDMABusy();\r
 565                                 sdBusy = sdDMABusy();\r
 566                                 if (scsiBusy && sdBusy)\r
 567                                 {\r
 568                                         __WFI();\r
 569                                 }\r
 570                                 CyExitCriticalSection(intr);\r
 571                         }\r
 572 #endif\r
 573 \r
 574 #if 0\r
 575                         if (sdActive && !sdBusy && sdReadSectorDMAPoll())\r
 576                         {\r
 577                                 sdActive = 0;\r
 578                                 prep++;\r
 579                         }\r
 580 \r
 581                         // Usually SD is slower than the SCSI interface.\r
 582                         // Prioritise starting the read of the next sector over starting a\r
 583                         // SCSI transfer for the last sector\r
 584                         // ie. NO "else" HERE.\r
 585                         if (!sdActive &&\r
 586                                 (prep - i < buffers) &&\r
 587                                 (prep < totalSDSectors))\r
 588                         {\r
 589                                 // Start an SD transfer if we have space.\r
 590                                 if (transfer.multiBlock)\r
 591                                 {\r
 592                                         sdReadMultiSectorDMA(&scsiDev.data[SD_SECTOR_SIZE * (prep % buffers)]);\r
 593                                 }\r
 594                                 else\r
 595                                 {\r
 596                                         sdReadSingleSectorDMA(sdLBA + prep, &scsiDev.data[SD_SECTOR_SIZE * (prep % buffers)]);\r
 597                                 }\r
 598                                 sdActive = 1;\r
 599                         }\r
 600 #endif\r
 601                         if ((prep - i < buffers) &&\r
 602                                 (prep < totalSDSectors))\r
 603                         {\r
 604                                 // TODO MM Blocking reads are bad mmkay\r
 605                                 sdTmpRead(&scsiDev.data[SD_SECTOR_SIZE * (prep % buffers)], sdLBA + prep, 1);\r
 606                                 prep++;\r
 607                         }\r
 608 \r
 609                         if (scsiActive && scsiPhyComplete() && scsiWriteDMAPoll())\r
 610                         {\r
 611                                 scsiActive = 0;\r
 612                                 i++;\r
 613                                 scsiPhyFifoFlip();\r
 614                         }\r
 615                         if (!scsiActive && ((prep - i) > 0))\r
 616                         {\r
 617                                 int dmaBytes = SD_SECTOR_SIZE;\r
 618                                 if ((i % sdPerScsi) == (sdPerScsi - 1))\r
 619                                 {\r
 620                                         dmaBytes = bytesPerSector % SD_SECTOR_SIZE;\r
 621                                         if (dmaBytes == 0) dmaBytes = SD_SECTOR_SIZE;\r
 622                                 }\r
 623                                 scsiWriteDMA(&scsiDev.data[SD_SECTOR_SIZE * (i % buffers)], dmaBytes);\r
 624                                 scsiActive = 1;\r
 625                         }\r
 626                 }\r
 627 \r
 628                 // We've finished transferring the data to the FPGA, now wait until it's\r
 629                 // written to he SCSI bus.\r
 630                 while (!scsiPhyComplete() &&\r
 631                         likely(scsiDev.phase == DATA_IN) &&\r
 632                         likely(!scsiDev.resetFlag))\r
 633                 {\r
 634 #if 0\r
 635                 _WFI();\r
 636 #endif\r
 637                 }\r
 638 \r
 639 \r
 640                 if (scsiDev.phase == DATA_IN)\r
 641                 {\r
 642                         scsiDev.phase = STATUS;\r
 643                 }\r
 644                 scsiDiskReset();\r
 645         }\r
 646         else if (scsiDev.phase == DATA_OUT &&\r
 647                 transfer.currentBlock != transfer.blocks)\r
 648         {\r
 649                 scsiEnterPhase(DATA_OUT);\r
 650 \r
 651                 const int sdPerScsi = SDSectorsPerSCSISector(bytesPerSector);\r
 652                 int totalSDSectors = transfer.blocks * sdPerScsi;\r
 653                 uint32_t sdLBA =\r
 654                         SCSISector2SD(\r
 655                                 scsiDev.target->cfg->sdSectorStart,\r
 656                                 bytesPerSector,\r
 657                                 transfer.lba);\r
 658                 // int buffers = sizeof(scsiDev.data) / SD_SECTOR_SIZE;\r
 659                 // int prep = 0;\r
 660                 int i = 0;\r
 661                 // int scsiDisconnected = 0;\r
 662                 int scsiComplete = 0;\r
 663                 // uint32_t lastActivityTime = s2s_getTime_ms();\r
 664                 // int scsiActive = 0;\r
 665                 // int sdActive = 0;\r
 666 \r
 667                 while ((i < totalSDSectors) &&\r
 668                         (likely(scsiDev.phase == DATA_OUT) || // scsiDisconnect keeps our phase.\r
 669                                 scsiComplete) &&\r
 670                         likely(!scsiDev.resetFlag))\r
 671                 {\r
 672                         // Well, until we have some proper non-blocking SD code, we must\r
 673                         // do this in a half-duplex fashion. We need to write as much as\r
 674                         // possible in each SD card transaction.\r
 675                         uint32_t maxSectors = sizeof(scsiDev.data) / SD_SECTOR_SIZE;\r
 676                         uint32_t sectors =\r
 677                                 totalSDSectors < maxSectors ? totalSDSectors : maxSectors;\r
 678                         scsiRead(&scsiDev.data[0], sectors * SD_SECTOR_SIZE);\r
 679                         sdTmpWrite(&scsiDev.data[0], i + sdLBA, sectors);\r
 680                         i += sectors;\r
 681 #if 0\r
 682                         // Wait for the next DMA interrupt. It's beneficial to halt the\r
 683                         // processor to give the DMA controller more memory bandwidth to\r
 684                         // work with.\r
 685                         int scsiBusy = 1;\r
 686                         int sdBusy = 1;\r
 687                         while (scsiBusy && sdBusy)\r
 688                         {\r
 689                                 uint8_t intr = CyEnterCriticalSection();\r
 690                                 scsiBusy = scsiDMABusy();\r
 691                                 sdBusy = sdDMABusy();\r
 692                                 if (scsiBusy && sdBusy)\r
 693                                 {\r
 694                                         __WFI();\r
 695                                 }\r
 696                                 CyExitCriticalSection(intr);\r
 697                         }\r
 698 \r
 699                         if (sdActive && !sdBusy && sdWriteSectorDMAPoll())\r
 700                         {\r
 701                                 sdActive = 0;\r
 702                                 i++;\r
 703                         }\r
 704                         if (!sdActive && ((prep - i) > 0))\r
 705                         {\r
 706                                 // Start an SD transfer if we have space.\r
 707                                 sdWriteMultiSectorDMA(&scsiDev.data[SD_SECTOR_SIZE * (i % buffers)]);\r
 708                                 sdActive = 1;\r
 709                         }\r
 710 \r
 711                         uint32_t now = getTime_ms();\r
 712 \r
 713                         if (scsiActive && !scsiBusy && scsiReadDMAPoll())\r
 714                         {\r
 715                                 scsiActive = 0;\r
 716                                 ++prep;\r
 717                                 lastActivityTime = now;\r
 718                         }\r
 719                         if (!scsiActive &&\r
 720                                 ((prep - i) < buffers) &&\r
 721                                 (prep < totalSDSectors) &&\r
 722                                 likely(!scsiDisconnected))\r
 723                         {\r
 724                                 int dmaBytes = SD_SECTOR_SIZE;\r
 725                                 if ((prep % sdPerScsi) == (sdPerScsi - 1))\r
 726                                 {\r
 727                                         dmaBytes = bytesPerSector % SD_SECTOR_SIZE;\r
 728                                         if (dmaBytes == 0) dmaBytes = SD_SECTOR_SIZE;\r
 729                                 }\r
 730                                 scsiReadDMA(&scsiDev.data[SD_SECTOR_SIZE * (prep % buffers)], dmaBytes);\r
 731                                 scsiActive = 1;\r
 732                         }\r
 733                         else if (\r
 734                                 (scsiDev.boardCfg.flags & CONFIG_ENABLE_DISCONNECT) &&\r
 735                                 (scsiActive == 0) &&\r
 736                                 likely(!scsiDisconnected) &&\r
 737                                 unlikely(scsiDev.discPriv) &&\r
 738                                 unlikely(diffTime_ms(lastActivityTime, now) >= 20) &&\r
 739                                 likely(scsiDev.phase == DATA_OUT))\r
 740                         {\r
 741                                 // We're transferring over the SCSI bus faster than the SD card\r
 742                                 // can write.  There is no more buffer space once we've finished\r
 743                                 // this SCSI transfer.\r
 744                                 // The NCR 53C700 interface chips have a 250ms "byte-to-byte"\r
 745                                 // timeout buffer. SD card writes are supposed to complete\r
 746                                 // within 200ms, but sometimes they don't.\r
 747                                 // The NCR 53C700 series is used on HP 9000 workstations.\r
 748                                 scsiDisconnect();\r
 749                                 scsiDisconnected = 1;\r
 750                                 lastActivityTime = getTime_ms();\r
 751                         }\r
 752                         else if (unlikely(scsiDisconnected) &&\r
 753                                 (\r
 754                                         (prep == i) || // Buffers empty.\r
 755                                         // Send some messages every 100ms so we don't timeout.\r
 756                                         // At a minimum, a reselection involves an IDENTIFY message.\r
 757                                         unlikely(diffTime_ms(lastActivityTime, now) >= 100)\r
 758                                 ))\r
 759                         {\r
 760                                 int reconnected = scsiReconnect();\r
 761                                 if (reconnected)\r
 762                                 {\r
 763                                         scsiDisconnected = 0;\r
 764                                         lastActivityTime = getTime_ms(); // Don't disconnect immediately.\r
 765                                 }\r
 766                                 else if (diffTime_ms(lastActivityTime, getTime_ms()) >= 10000)\r
 767                                 {\r
 768                                         // Give up after 10 seconds of trying to reconnect.\r
 769                                         scsiDev.resetFlag = 1;\r
 770                                 }\r
 771                         }\r
 772                         else if (\r
 773                                 likely(!scsiComplete) &&\r
 774                                 (sdActive == 1) &&\r
 775                                 (prep == totalSDSectors) && // All scsi data read and buffered\r
 776                                 likely(!scsiDev.discPriv) && // Prefer disconnect where possible.\r
 777                                 unlikely(diffTime_ms(lastActivityTime, now) >= 150) &&\r
 778 \r
 779                                 likely(scsiDev.phase == DATA_OUT) &&\r
 780                                 !(scsiDev.cdb[scsiDev.cdbLen - 1] & 0x01) // Not linked command\r
 781                                 )\r
 782                         {\r
 783                                 // We're transferring over the SCSI bus faster than the SD card\r
 784                                 // can write.  All data is buffered, and we're just waiting for\r
 785                                 // the SD card to complete. The host won't let us disconnect.\r
 786                                 // Some drivers set a 250ms timeout on transfers to complete.\r
 787                                 // SD card writes are supposed to complete\r
 788                                 // within 200ms, but sometimes they don'to.\r
 789                                 // Just pretend we're finished.\r
 790                                 scsiComplete = 1;\r
 791 \r
 792                                 process_Status();\r
 793                                 process_MessageIn(); // Will go to BUS_FREE state\r
 794 \r
 795                                 // Try and prevent anyone else using the SCSI bus while we're not ready.\r
 796                                 SCSI_SetPin(SCSI_Out_BSY); \r
 797                         }\r
 798 #endif\r
 799                 }\r
 800 \r
 801 #if 0\r
 802                 if (scsiComplete)\r
 803                 {\r
 804                         SCSI_ClearPin(SCSI_Out_BSY);\r
 805                 }\r
 806                 while (\r
 807                         !scsiDev.resetFlag &&\r
 808                         unlikely(scsiDisconnected) &&\r
 809                         (s2s_elapsedTime_ms(lastActivityTime) <= 10000))\r
 810                 {\r
 811                         scsiDisconnected = !scsiReconnect();\r
 812                 }\r
 813                 if (scsiDisconnected)\r
 814                 {\r
 815                         // Failed to reconnect\r
 816                         scsiDev.resetFlag = 1;\r
 817                 }\r
 818 #endif\r
 819 \r
 820                 if (scsiDev.phase == DATA_OUT)\r
 821                 {\r
 822                         if (scsiDev.parityError &&\r
 823                                 (scsiDev.boardCfg.flags & S2S_CFG_ENABLE_PARITY) &&\r
 824                                 (scsiDev.compatMode >= COMPAT_SCSI2))\r
 825                         {\r
 826                                 scsiDev.target->sense.code = ABORTED_COMMAND;\r
 827                                 scsiDev.target->sense.asc = SCSI_PARITY_ERROR;\r
 828                                 scsiDev.status = CHECK_CONDITION;;\r
 829                         }\r
 830                         scsiDev.phase = STATUS;\r
 831                 }\r
 832                 scsiDiskReset();\r
 833         }\r
 834 }\r
 835 \r
 836 void scsiDiskReset()\r
 837 {\r
 838         scsiDev.dataPtr = 0;\r
 839         scsiDev.savedDataPtr = 0;\r
 840         scsiDev.dataLen = 0;\r
 841         // transfer.lba = 0; // Needed in Request Sense to determine failure\r
 842         transfer.blocks = 0;\r
 843         transfer.currentBlock = 0;\r
 844 \r
 845         // Cancel long running commands!\r
 846         if (\r
 847                 ((scsiDev.boardCfg.flags & S2S_CFG_ENABLE_CACHE) == 0) ||\r
 848                         (transfer.multiBlock == 0)\r
 849                 )\r
 850         {\r
 851 #if 0\r
 852                 sdCompleteTransfer();\r
 853 #endif\r
 854         }\r
 855 \r
 856         transfer.multiBlock = 0;\r
 857 }\r
 858 \r
 859 void scsiDiskInit()\r
 860 {\r
 861         scsiDiskReset();\r
 862 \r
 863         // Don't require the host to send us a START STOP UNIT command\r
 864         blockDev.state = DISK_STARTED;\r
 865 }\r
 866 \r