drivers/usb/storage/sddr55.c

   1 /* Driver for SanDisk SDDR-55 SmartMedia reader
   2  *
   3  * $Id:$
   4  *
   5  * SDDR55 driver v0.1:
   6  *
   7  * First release
   8  *
   9  * Current development and maintenance by:
  10  *   (c) 2002 Simon Munton
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2, or (at your option) any
  15  * later version.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License along
  23  * with this program; if not, write to the Free Software Foundation, Inc.,
  24  * 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #include <linux/jiffies.h>
  28 #include <linux/errno.h>
  29 #include <linux/slab.h>
  30
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_cmnd.h>
  33
  34 #include "usb.h"
  35 #include "transport.h"
  36 #include "protocol.h"
  37 #include "debug.h"
  38 #include "sddr55.h"
  39
  40
  41 #define short_pack(lsb,msb) ( ((u16)(lsb)) | ( ((u16)(msb))<<8 ) )
  42 #define LSB_of(s) ((s)&0xFF)
  43 #define MSB_of(s) ((s)>>8)
  44 #define PAGESIZE  512
  45
  46 #define set_sense_info(sk, asc, ascq)   \
  47     do {                                \
  48         info->sense_data[2] = sk;       \
  49         info->sense_data[12] = asc;     \
  50         info->sense_data[13] = ascq;    \
  51         } while (0)
  52
  53
  54 struct sddr55_card_info {
  55         unsigned long   capacity;       /* Size of card in bytes */
  56         int             max_log_blks;   /* maximum number of logical blocks */
  57         int             pageshift;      /* log2 of pagesize */
  58         int             smallpageshift; /* 1 if pagesize == 256 */
  59         int             blocksize;      /* Size of block in pages */
  60         int             blockshift;     /* log2 of blocksize */
  61         int             blockmask;      /* 2^blockshift - 1 */
  62         int             read_only;      /* non zero if card is write protected */
  63         int             force_read_only;        /* non zero if we find a map error*/
  64         int             *lba_to_pba;    /* logical to physical map */
  65         int             *pba_to_lba;    /* physical to logical map */
  66         int             fatal_error;    /* set if we detect something nasty */
  67         unsigned long   last_access;    /* number of jiffies since we last talked to device */
  68         unsigned char   sense_data[18];
  69 };
  70
  71
  72 #define NOT_ALLOCATED           0xffffffff
  73 #define BAD_BLOCK               0xffff
  74 #define CIS_BLOCK               0x400
  75 #define UNUSED_BLOCK            0x3ff
  76
  77 static int
  78 sddr55_bulk_transport(struct us_data *us, int direction,
  79                       unsigned char *data, unsigned int len) {
  80         struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
  81         unsigned int pipe = (direction == DMA_FROM_DEVICE) ?
  82                         us->recv_bulk_pipe : us->send_bulk_pipe;
  83
  84         if (!len)
  85                 return USB_STOR_XFER_GOOD;
  86         info->last_access = jiffies;
  87         return usb_stor_bulk_transfer_buf(us, pipe, data, len, NULL);
  88 }
  89
  90 /* check if card inserted, if there is, update read_only status
  91  * return non zero if no card
  92  */
  93
  94 static int sddr55_status(struct us_data *us)
  95 {
  96         int result;
  97         unsigned char *command = us->iobuf;
  98         unsigned char *status = us->iobuf;
  99         struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
 100
 101         /* send command */
 102         memset(command, 0, 8);
 103         command[5] = 0xB0;
 104         command[7] = 0x80;
 105         result = sddr55_bulk_transport(us,
 106                 DMA_TO_DEVICE, command, 8);
 107
 108         US_DEBUGP("Result for send_command in status %d\n",
 109                 result);
 110
 111         if (result != USB_STOR_XFER_GOOD) {
 112                 set_sense_info (4, 0, 0);       /* hardware error */
 113                 return USB_STOR_TRANSPORT_ERROR;
 114         }
 115
 116         result = sddr55_bulk_transport(us,
 117                 DMA_FROM_DEVICE, status,        4);
 118
 119         /* expect to get short transfer if no card fitted */
 120         if (result == USB_STOR_XFER_SHORT || result == USB_STOR_XFER_STALLED) {
 121                 /* had a short transfer, no card inserted, free map memory */
 122                 kfree(info->lba_to_pba);
 123                 kfree(info->pba_to_lba);
 124                 info->lba_to_pba = NULL;
 125                 info->pba_to_lba = NULL;
 126
 127                 info->fatal_error = 0;
 128                 info->force_read_only = 0;
 129
 130                 set_sense_info (2, 0x3a, 0);    /* not ready, medium not present */
 131                 return USB_STOR_TRANSPORT_FAILED;
 132         }
 133
 134         if (result != USB_STOR_XFER_GOOD) {
 135                 set_sense_info (4, 0, 0);       /* hardware error */
 136                 return USB_STOR_TRANSPORT_FAILED;
 137         }
 138
 139         /* check write protect status */
 140         info->read_only = (status[0] & 0x20);
 141
 142         /* now read status */
 143         result = sddr55_bulk_transport(us,
 144                 DMA_FROM_DEVICE, status,        2);
 145
 146         if (result != USB_STOR_XFER_GOOD) {
 147                 set_sense_info (4, 0, 0);       /* hardware error */
 148         }
 149
 150         return (result == USB_STOR_XFER_GOOD ?
 151                         USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_FAILED);
 152 }
 153
 154
 155 static int sddr55_read_data(struct us_data *us,
 156                 unsigned int lba,
 157                 unsigned int page,
 158                 unsigned short sectors) {
 159
 160         int result = USB_STOR_TRANSPORT_GOOD;
 161         unsigned char *command = us->iobuf;
 162         unsigned char *status = us->iobuf;
 163         struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
 164         unsigned char *buffer;
 165
 166         unsigned int pba;
 167         unsigned long address;
 168
 169         unsigned short pages;
 170         unsigned int len, index, offset;
 171
 172         // Since we only read in one block at a time, we have to create
 173         // a bounce buffer and move the data a piece at a time between the
 174         // bounce buffer and the actual transfer buffer.
 175
 176         len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
 177                         info->smallpageshift) * PAGESIZE;
 178         buffer = kmalloc(len, GFP_NOIO);
 179         if (buffer == NULL)
 180                 return USB_STOR_TRANSPORT_ERROR; /* out of memory */
 181         index = offset = 0;
 182
 183         while (sectors>0) {
 184
 185                 /* have we got to end? */
 186                 if (lba >= info->max_log_blks)
 187                         break;
 188
 189                 pba = info->lba_to_pba[lba];
 190
 191                 // Read as many sectors as possible in this block
 192
 193                 pages = min((unsigned int) sectors << info->smallpageshift,
 194                                 info->blocksize - page);
 195                 len = pages << info->pageshift;
 196
 197                 US_DEBUGP("Read %02X pages, from PBA %04X"
 198                         " (LBA %04X) page %02X\n",
 199                         pages, pba, lba, page);
 200
 201                 if (pba == NOT_ALLOCATED) {
 202                         /* no pba for this lba, fill with zeroes */
 203                         memset (buffer, 0, len);
 204                 } else {
 205
 206                         address = (pba << info->blockshift) + page;
 207
 208                         command[0] = 0;
 209                         command[1] = LSB_of(address>>16);
 210                         command[2] = LSB_of(address>>8);
 211                         command[3] = LSB_of(address);
 212
 213                         command[4] = 0;
 214                         command[5] = 0xB0;
 215                         command[6] = LSB_of(pages << (1 - info->smallpageshift));
 216                         command[7] = 0x85;
 217
 218                         /* send command */
 219                         result = sddr55_bulk_transport(us,
 220                                 DMA_TO_DEVICE, command, 8);
 221
 222                         US_DEBUGP("Result for send_command in read_data %d\n",
 223                                 result);
 224
 225                         if (result != USB_STOR_XFER_GOOD) {
 226                                 result = USB_STOR_TRANSPORT_ERROR;
 227                                 goto leave;
 228                         }
 229
 230                         /* read data */
 231                         result = sddr55_bulk_transport(us,
 232                                 DMA_FROM_DEVICE, buffer, len);
 233
 234                         if (result != USB_STOR_XFER_GOOD) {
 235                                 result = USB_STOR_TRANSPORT_ERROR;
 236                                 goto leave;
 237                         }
 238
 239                         /* now read status */
 240                         result = sddr55_bulk_transport(us,
 241                                 DMA_FROM_DEVICE, status, 2);
 242
 243                         if (result != USB_STOR_XFER_GOOD) {
 244                                 result = USB_STOR_TRANSPORT_ERROR;
 245                                 goto leave;
 246                         }
 247
 248                         /* check status for error */
 249                         if (status[0] == 0xff && status[1] == 0x4) {
 250                                 set_sense_info (3, 0x11, 0);
 251                                 result = USB_STOR_TRANSPORT_FAILED;
 252                                 goto leave;
 253                         }
 254                 }
 255
 256                 // Store the data in the transfer buffer
 257                 usb_stor_access_xfer_buf(buffer, len, us->srb,
 258                                 &index, &offset, TO_XFER_BUF);
 259
 260                 page = 0;
 261                 lba++;
 262                 sectors -= pages >> info->smallpageshift;
 263         }
 264
 265         result = USB_STOR_TRANSPORT_GOOD;
 266
 267 leave:
 268         kfree(buffer);
 269
 270         return result;
 271 }
 272
 273 static int sddr55_write_data(struct us_data *us,
 274                 unsigned int lba,
 275                 unsigned int page,
 276                 unsigned short sectors) {
 277
 278         int result = USB_STOR_TRANSPORT_GOOD;
 279         unsigned char *command = us->iobuf;
 280         unsigned char *status = us->iobuf;
 281         struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
 282         unsigned char *buffer;
 283
 284         unsigned int pba;
 285         unsigned int new_pba;
 286         unsigned long address;
 287
 288         unsigned short pages;
 289         int i;
 290         unsigned int len, index, offset;
 291
 292         /* check if we are allowed to write */
 293         if (info->read_only || info->force_read_only) {
 294                 set_sense_info (7, 0x27, 0);    /* read only */
 295                 return USB_STOR_TRANSPORT_FAILED;
 296         }
 297
 298         // Since we only write one block at a time, we have to create
 299         // a bounce buffer and move the data a piece at a time between the
 300         // bounce buffer and the actual transfer buffer.
 301
 302         len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
 303                         info->smallpageshift) * PAGESIZE;
 304         buffer = kmalloc(len, GFP_NOIO);
 305         if (buffer == NULL)
 306                 return USB_STOR_TRANSPORT_ERROR;
 307         index = offset = 0;
 308
 309         while (sectors > 0) {
 310
 311                 /* have we got to end? */
 312                 if (lba >= info->max_log_blks)
 313                         break;
 314
 315                 pba = info->lba_to_pba[lba];
 316
 317                 // Write as many sectors as possible in this block
 318
 319                 pages = min((unsigned int) sectors << info->smallpageshift,
 320                                 info->blocksize - page);
 321                 len = pages << info->pageshift;
 322
 323                 // Get the data from the transfer buffer
 324                 usb_stor_access_xfer_buf(buffer, len, us->srb,
 325                                 &index, &offset, FROM_XFER_BUF);
 326
 327                 US_DEBUGP("Write %02X pages, to PBA %04X"
 328                         " (LBA %04X) page %02X\n",
 329                         pages, pba, lba, page);
 330
 331                 command[4] = 0;
 332
 333                 if (pba == NOT_ALLOCATED) {
 334                         /* no pba allocated for this lba, find a free pba to use */
 335
 336                         int max_pba = (info->max_log_blks / 250 ) * 256;
 337                         int found_count = 0;
 338                         int found_pba = -1;
 339
 340                         /* set pba to first block in zone lba is in */
 341                         pba = (lba / 1000) * 1024;
 342
 343                         US_DEBUGP("No PBA for LBA %04X\n",lba);
 344
 345                         if (max_pba > 1024)
 346                                 max_pba = 1024;
 347
 348                         /*
 349                          * Scan through the map looking for an unused block
 350                          * leave 16 unused blocks at start (or as many as
 351                          * possible) since the sddr55 seems to reuse a used
 352                          * block when it shouldn't if we don't leave space.
 353                          */
 354                         for (i = 0; i < max_pba; i++, pba++) {
 355                                 if (info->pba_to_lba[pba] == UNUSED_BLOCK) {
 356                                         found_pba = pba;
 357                                         if (found_count++ > 16)
 358                                                 break;
 359                                 }
 360                         }
 361
 362                         pba = found_pba;
 363
 364                         if (pba == -1) {
 365                                 /* oh dear */
 366                                 US_DEBUGP("Couldn't find unallocated block\n");
 367
 368                                 set_sense_info (3, 0x31, 0);    /* medium error */
 369                                 result = USB_STOR_TRANSPORT_FAILED;
 370                                 goto leave;
 371                         }
 372
 373                         US_DEBUGP("Allocating PBA %04X for LBA %04X\n", pba, lba);
 374
 375                         /* set writing to unallocated block flag */
 376                         command[4] = 0x40;
 377                 }
 378
 379                 address = (pba << info->blockshift) + page;
 380
 381                 command[1] = LSB_of(address>>16);
 382                 command[2] = LSB_of(address>>8);
 383                 command[3] = LSB_of(address);
 384
 385                 /* set the lba into the command, modulo 1000 */
 386                 command[0] = LSB_of(lba % 1000);
 387                 command[6] = MSB_of(lba % 1000);
 388
 389                 command[4] |= LSB_of(pages >> info->smallpageshift);
 390                 command[5] = 0xB0;
 391                 command[7] = 0x86;
 392
 393                 /* send command */
 394                 result = sddr55_bulk_transport(us,
 395                         DMA_TO_DEVICE, command, 8);
 396
 397                 if (result != USB_STOR_XFER_GOOD) {
 398                         US_DEBUGP("Result for send_command in write_data %d\n",
 399                         result);
 400
 401                         /* set_sense_info is superfluous here? */
 402                         set_sense_info (3, 0x3, 0);/* peripheral write error */
 403                         result = USB_STOR_TRANSPORT_FAILED;
 404                         goto leave;
 405                 }
 406
 407                 /* send the data */
 408                 result = sddr55_bulk_transport(us,
 409                         DMA_TO_DEVICE, buffer, len);
 410
 411                 if (result != USB_STOR_XFER_GOOD) {
 412                         US_DEBUGP("Result for send_data in write_data %d\n",
 413                                   result);
 414
 415                         /* set_sense_info is superfluous here? */
 416                         set_sense_info (3, 0x3, 0);/* peripheral write error */
 417                         result = USB_STOR_TRANSPORT_FAILED;
 418                         goto leave;
 419                 }
 420
 421                 /* now read status */
 422                 result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, status, 6);
 423
 424                 if (result != USB_STOR_XFER_GOOD) {
 425                         US_DEBUGP("Result for get_status in write_data %d\n",
 426                                   result);
 427
 428                         /* set_sense_info is superfluous here? */
 429                         set_sense_info (3, 0x3, 0);/* peripheral write error */
 430                         result = USB_STOR_TRANSPORT_FAILED;
 431                         goto leave;
 432                 }
 433
 434                 new_pba = (status[3] + (status[4] << 8) + (status[5] << 16))
 435                                                   >> info->blockshift;
 436
 437                 /* check status for error */
 438                 if (status[0] == 0xff && status[1] == 0x4) {
 439                         info->pba_to_lba[new_pba] = BAD_BLOCK;
 440
 441                         set_sense_info (3, 0x0c, 0);
 442                         result = USB_STOR_TRANSPORT_FAILED;
 443                         goto leave;
 444                 }
 445
 446                 US_DEBUGP("Updating maps for LBA %04X: old PBA %04X, new PBA %04X\n",
 447                         lba, pba, new_pba);
 448
 449                 /* update the lba<->pba maps, note new_pba might be the same as pba */
 450                 info->lba_to_pba[lba] = new_pba;
 451                 info->pba_to_lba[pba] = UNUSED_BLOCK;
 452
 453                 /* check that new_pba wasn't already being used */
 454                 if (info->pba_to_lba[new_pba] != UNUSED_BLOCK) {
 455                         printk(KERN_ERR "sddr55 error: new PBA %04X already in use for LBA %04X\n",
 456                                 new_pba, info->pba_to_lba[new_pba]);
 457                         info->fatal_error = 1;
 458                         set_sense_info (3, 0x31, 0);
 459                         result = USB_STOR_TRANSPORT_FAILED;
 460                         goto leave;
 461                 }
 462
 463                 /* update the pba<->lba maps for new_pba */
 464                 info->pba_to_lba[new_pba] = lba % 1000;
 465
 466                 page = 0;
 467                 lba++;
 468                 sectors -= pages >> info->smallpageshift;
 469         }
 470         result = USB_STOR_TRANSPORT_GOOD;
 471
 472  leave:
 473         kfree(buffer);
 474         return result;
 475 }
 476
 477 static int sddr55_read_deviceID(struct us_data *us,
 478                 unsigned char *manufacturerID,
 479                 unsigned char *deviceID) {
 480
 481         int result;
 482         unsigned char *command = us->iobuf;
 483         unsigned char *content = us->iobuf;
 484
 485         memset(command, 0, 8);
 486         command[5] = 0xB0;
 487         command[7] = 0x84;
 488         result = sddr55_bulk_transport(us, DMA_TO_DEVICE, command, 8);
 489
 490         US_DEBUGP("Result of send_control for device ID is %d\n",
 491                 result);
 492
 493         if (result != USB_STOR_XFER_GOOD)
 494                 return USB_STOR_TRANSPORT_ERROR;
 495
 496         result = sddr55_bulk_transport(us,
 497                 DMA_FROM_DEVICE, content, 4);
 498
 499         if (result != USB_STOR_XFER_GOOD)
 500                 return USB_STOR_TRANSPORT_ERROR;
 501
 502         *manufacturerID = content[0];
 503         *deviceID = content[1];
 504
 505         if (content[0] != 0xff) {
 506                 result = sddr55_bulk_transport(us,
 507                         DMA_FROM_DEVICE, content, 2);
 508         }
 509
 510         return USB_STOR_TRANSPORT_GOOD;
 511 }
 512
 513
 514 int sddr55_reset(struct us_data *us) {
 515         return 0;
 516 }
 517
 518
 519 static unsigned long sddr55_get_capacity(struct us_data *us) {
 520
 521         unsigned char manufacturerID;
 522         unsigned char deviceID;
 523         int result;
 524         struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
 525
 526         US_DEBUGP("Reading capacity...\n");
 527
 528         result = sddr55_read_deviceID(us,
 529                 &manufacturerID,
 530                 &deviceID);
 531
 532         US_DEBUGP("Result of read_deviceID is %d\n",
 533                 result);
 534
 535         if (result != USB_STOR_XFER_GOOD)
 536                 return 0;
 537
 538         US_DEBUGP("Device ID = %02X\n", deviceID);
 539         US_DEBUGP("Manuf  ID = %02X\n", manufacturerID);
 540
 541         info->pageshift = 9;
 542         info->smallpageshift = 0;
 543         info->blocksize = 16;
 544         info->blockshift = 4;
 545         info->blockmask = 15;
 546
 547         switch (deviceID) {
 548
 549         case 0x6e: // 1MB
 550         case 0xe8:
 551         case 0xec:
 552                 info->pageshift = 8;
 553                 info->smallpageshift = 1;
 554                 return 0x00100000;
 555
 556         case 0xea: // 2MB
 557         case 0x64:
 558                 info->pageshift = 8;
 559                 info->smallpageshift = 1;
 560         case 0x5d: // 5d is a ROM card with pagesize 512.
 561                 return 0x00200000;
 562
 563         case 0xe3: // 4MB
 564         case 0xe5:
 565         case 0x6b:
 566         case 0xd5:
 567                 return 0x00400000;
 568
 569         case 0xe6: // 8MB
 570         case 0xd6:
 571                 return 0x00800000;
 572
 573         case 0x73: // 16MB
 574                 info->blocksize = 32;
 575                 info->blockshift = 5;
 576                 info->blockmask = 31;
 577                 return 0x01000000;
 578
 579         case 0x75: // 32MB
 580                 info->blocksize = 32;
 581                 info->blockshift = 5;
 582                 info->blockmask = 31;
 583                 return 0x02000000;
 584
 585         case 0x76: // 64MB
 586                 info->blocksize = 32;
 587                 info->blockshift = 5;
 588                 info->blockmask = 31;
 589                 return 0x04000000;
 590
 591         case 0x79: // 128MB
 592                 info->blocksize = 32;
 593                 info->blockshift = 5;
 594                 info->blockmask = 31;
 595                 return 0x08000000;
 596
 597         default: // unknown
 598                 return 0;
 599
 600         }
 601 }
 602
 603 static int sddr55_read_map(struct us_data *us) {
 604
 605         struct sddr55_card_info *info = (struct sddr55_card_info *)(us->extra);
 606         int numblocks;
 607         unsigned char *buffer;
 608         unsigned char *command = us->iobuf;
 609         int i;
 610         unsigned short lba;
 611         unsigned short max_lba;
 612         int result;
 613
 614         if (!info->capacity)
 615                 return -1;
 616
 617         numblocks = info->capacity >> (info->blockshift + info->pageshift);
 618
 619         buffer = kmalloc( numblocks * 2, GFP_NOIO );
 620
 621         if (!buffer)
 622                 return -1;
 623
 624         memset(command, 0, 8);
 625         command[5] = 0xB0;
 626         command[6] = numblocks * 2 / 256;
 627         command[7] = 0x8A;
 628
 629         result = sddr55_bulk_transport(us, DMA_TO_DEVICE, command, 8);
 630
 631         if ( result != USB_STOR_XFER_GOOD) {
 632                 kfree (buffer);
 633                 return -1;
 634         }
 635
 636         result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, buffer, numblocks * 2);
 637
 638         if ( result != USB_STOR_XFER_GOOD) {
 639                 kfree (buffer);
 640                 return -1;
 641         }
 642
 643         result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, command, 2);
 644
 645         if ( result != USB_STOR_XFER_GOOD) {
 646                 kfree (buffer);
 647                 return -1;
 648         }
 649
 650         kfree(info->lba_to_pba);
 651         kfree(info->pba_to_lba);
 652         info->lba_to_pba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
 653         info->pba_to_lba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
 654
 655         if (info->lba_to_pba == NULL || info->pba_to_lba == NULL) {
 656                 kfree(info->lba_to_pba);
 657                 kfree(info->pba_to_lba);
 658                 info->lba_to_pba = NULL;
 659                 info->pba_to_lba = NULL;
 660                 kfree(buffer);
 661                 return -1;
 662         }
 663
 664         memset(info->lba_to_pba, 0xff, numblocks*sizeof(int));
 665         memset(info->pba_to_lba, 0xff, numblocks*sizeof(int));
 666
 667         /* set maximum lba */
 668         max_lba = info->max_log_blks;
 669         if (max_lba > 1000)
 670                 max_lba = 1000;
 671
 672         // Each block is 64 bytes of control data, so block i is located in
 673         // scatterlist block i*64/128k = i*(2^6)*(2^-17) = i*(2^-11)
 674
 675         for (i=0; i<numblocks; i++) {
 676                 int zone = i / 1024;
 677
 678                 lba = short_pack(buffer[i * 2], buffer[i * 2 + 1]);
 679
 680                         /* Every 1024 physical blocks ("zone"), the LBA numbers
 681                          * go back to zero, but are within a higher
 682                          * block of LBA's. Also, there is a maximum of
 683                          * 1000 LBA's per zone. In other words, in PBA
 684                          * 1024-2047 you will find LBA 0-999 which are
 685                          * really LBA 1000-1999. Yes, this wastes 24
 686                          * physical blocks per zone. Go figure.
 687                          * These devices can have blocks go bad, so there
 688                          * are 24 spare blocks to use when blocks do go bad.
 689                          */
 690
 691                         /* SDDR55 returns 0xffff for a bad block, and 0x400 for the
 692                          * CIS block. (Is this true for cards 8MB or less??)
 693                          * Record these in the physical to logical map
 694                          */
 695
 696                 info->pba_to_lba[i] = lba;
 697
 698                 if (lba >= max_lba) {
 699                         continue;
 700                 }
 701
 702                 if (info->lba_to_pba[lba + zone * 1000] != NOT_ALLOCATED &&
 703                     !info->force_read_only) {
 704                         printk("sddr55: map inconsistency at LBA %04X\n", lba + zone * 1000);
 705                         info->force_read_only = 1;
 706                 }
 707
 708                 if (lba<0x10 || (lba>=0x3E0 && lba<0x3EF))
 709                         US_DEBUGP("LBA %04X <-> PBA %04X\n", lba, i);
 710
 711                 info->lba_to_pba[lba + zone * 1000] = i;
 712         }
 713
 714         kfree(buffer);
 715         return 0;
 716 }
 717
 718
 719 static void sddr55_card_info_destructor(void *extra) {
 720         struct sddr55_card_info *info = (struct sddr55_card_info *)extra;
 721
 722         if (!extra)
 723                 return;
 724
 725         kfree(info->lba_to_pba);
 726         kfree(info->pba_to_lba);
 727 }
 728
 729
 730 /*
 731  * Transport for the Sandisk SDDR-55
 732  */
 733 int sddr55_transport(struct scsi_cmnd *srb, struct us_data *us)
 734 {
 735         int result;
 736         static unsigned char inquiry_response[8] = {
 737                 0x00, 0x80, 0x00, 0x02, 0x1F, 0x00, 0x00, 0x00
 738         };
 739         // write-protected for now, no block descriptor support
 740         static unsigned char mode_page_01[20] = {
 741                 0x0, 0x12, 0x00, 0x80, 0x0, 0x0, 0x0, 0x0,
 742                 0x01, 0x0A,
 743                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 744         };
 745         unsigned char *ptr = us->iobuf;
 746         unsigned long capacity;
 747         unsigned int lba;
 748         unsigned int pba;
 749         unsigned int page;
 750         unsigned short pages;
 751         struct sddr55_card_info *info;
 752
 753         if (!us->extra) {
 754                 us->extra = kmalloc(
 755                         sizeof(struct sddr55_card_info), GFP_NOIO);
 756                 if (!us->extra)
 757                         return USB_STOR_TRANSPORT_ERROR;
 758                 memset(us->extra, 0, sizeof(struct sddr55_card_info));
 759                 us->extra_destructor = sddr55_card_info_destructor;
 760         }
 761
 762         info = (struct sddr55_card_info *)(us->extra);
 763
 764         if (srb->cmnd[0] == REQUEST_SENSE) {
 765                 US_DEBUGP("SDDR55: request sense %02x/%02x/%02x\n", info->sense_data[2], info->sense_data[12], info->sense_data[13]);
 766
 767                 memcpy (ptr, info->sense_data, sizeof info->sense_data);
 768                 ptr[0] = 0x70;
 769                 ptr[7] = 11;
 770                 usb_stor_set_xfer_buf (ptr, sizeof info->sense_data, srb);
 771                 memset (info->sense_data, 0, sizeof info->sense_data);
 772
 773                 return USB_STOR_TRANSPORT_GOOD;
 774         }
 775
 776         memset (info->sense_data, 0, sizeof info->sense_data);
 777
 778         /* Dummy up a response for INQUIRY since SDDR55 doesn't
 779            respond to INQUIRY commands */
 780
 781         if (srb->cmnd[0] == INQUIRY) {
 782                 memcpy(ptr, inquiry_response, 8);
 783                 fill_inquiry_response(us, ptr, 36);
 784                 return USB_STOR_TRANSPORT_GOOD;
 785         }
 786
 787         /* only check card status if the map isn't allocated, ie no card seen yet
 788          * or if it's been over half a second since we last accessed it
 789          */
 790         if (info->lba_to_pba == NULL || time_after(jiffies, info->last_access + HZ/2)) {
 791
 792                 /* check to see if a card is fitted */
 793                 result = sddr55_status (us);
 794                 if (result) {
 795                         result = sddr55_status (us);
 796                         if (!result) {
 797                         set_sense_info (6, 0x28, 0);    /* new media, set unit attention, not ready to ready */
 798                         }
 799                         return USB_STOR_TRANSPORT_FAILED;
 800                 }
 801         }
 802
 803         /* if we detected a problem with the map when writing,
 804            don't allow any more access */
 805         if (info->fatal_error) {
 806
 807                 set_sense_info (3, 0x31, 0);
 808                 return USB_STOR_TRANSPORT_FAILED;
 809         }
 810
 811         if (srb->cmnd[0] == READ_CAPACITY) {
 812
 813                 capacity = sddr55_get_capacity(us);
 814
 815                 if (!capacity) {
 816                         set_sense_info (3, 0x30, 0); /* incompatible medium */
 817                         return USB_STOR_TRANSPORT_FAILED;
 818                 }
 819
 820                 info->capacity = capacity;
 821
 822                 /* figure out the maximum logical block number, allowing for
 823                  * the fact that only 250 out of every 256 are used */
 824                 info->max_log_blks = ((info->capacity >> (info->pageshift + info->blockshift)) / 256) * 250;
 825
 826                 /* Last page in the card, adjust as we only use 250 out of
 827                  * every 256 pages */
 828                 capacity = (capacity / 256) * 250;
 829
 830                 capacity /= PAGESIZE;
 831                 capacity--;
 832
 833                 ((__be32 *) ptr)[0] = cpu_to_be32(capacity);
 834                 ((__be32 *) ptr)[1] = cpu_to_be32(PAGESIZE);
 835                 usb_stor_set_xfer_buf(ptr, 8, srb);
 836
 837                 sddr55_read_map(us);
 838
 839                 return USB_STOR_TRANSPORT_GOOD;
 840         }
 841
 842         if (srb->cmnd[0] == MODE_SENSE_10) {
 843
 844                 memcpy(ptr, mode_page_01, sizeof mode_page_01);
 845                 ptr[3] = (info->read_only || info->force_read_only) ? 0x80 : 0;
 846                 usb_stor_set_xfer_buf(ptr, sizeof(mode_page_01), srb);
 847
 848                 if ( (srb->cmnd[2] & 0x3F) == 0x01 ) {
 849                         US_DEBUGP(
 850                           "SDDR55: Dummy up request for mode page 1\n");
 851                         return USB_STOR_TRANSPORT_GOOD;
 852
 853                 } else if ( (srb->cmnd[2] & 0x3F) == 0x3F ) {
 854                         US_DEBUGP(
 855                           "SDDR55: Dummy up request for all mode pages\n");
 856                         return USB_STOR_TRANSPORT_GOOD;
 857                 }
 858
 859                 set_sense_info (5, 0x24, 0);    /* invalid field in command */
 860                 return USB_STOR_TRANSPORT_FAILED;
 861         }
 862
 863         if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
 864
 865                 US_DEBUGP(
 866                   "SDDR55: %s medium removal. Not that I can do"
 867                   " anything about it...\n",
 868                   (srb->cmnd[4]&0x03) ? "Prevent" : "Allow");
 869
 870                 return USB_STOR_TRANSPORT_GOOD;
 871
 872         }
 873
 874         if (srb->cmnd[0] == READ_10 || srb->cmnd[0] == WRITE_10) {
 875
 876                 page = short_pack(srb->cmnd[3], srb->cmnd[2]);
 877                 page <<= 16;
 878                 page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
 879                 pages = short_pack(srb->cmnd[8], srb->cmnd[7]);
 880
 881                 page <<= info->smallpageshift;
 882
 883                 // convert page to block and page-within-block
 884
 885                 lba = page >> info->blockshift;
 886                 page = page & info->blockmask;
 887
 888                 // locate physical block corresponding to logical block
 889
 890                 if (lba >= info->max_log_blks) {
 891
 892                         US_DEBUGP("Error: Requested LBA %04X exceeds maximum "
 893                           "block %04X\n", lba, info->max_log_blks-1);
 894
 895                         set_sense_info (5, 0x24, 0);    /* invalid field in command */
 896
 897                         return USB_STOR_TRANSPORT_FAILED;
 898                 }
 899
 900                 pba = info->lba_to_pba[lba];
 901
 902                 if (srb->cmnd[0] == WRITE_10) {
 903                         US_DEBUGP("WRITE_10: write block %04X (LBA %04X) page %01X"
 904                                 " pages %d\n",
 905                                 pba, lba, page, pages);
 906
 907                         return sddr55_write_data(us, lba, page, pages);
 908                 } else {
 909                         US_DEBUGP("READ_10: read block %04X (LBA %04X) page %01X"
 910                                 " pages %d\n",
 911                                 pba, lba, page, pages);
 912
 913                         return sddr55_read_data(us, lba, page, pages);
 914                 }
 915         }
 916
 917
 918         if (srb->cmnd[0] == TEST_UNIT_READY) {
 919                 return USB_STOR_TRANSPORT_GOOD;
 920         }
 921
 922         if (srb->cmnd[0] == START_STOP) {
 923                 return USB_STOR_TRANSPORT_GOOD;
 924         }
 925
 926         set_sense_info (5, 0x20, 0);    /* illegal command */
 927
 928         return USB_STOR_TRANSPORT_FAILED; // FIXME: sense buffer?
 929 }
 930