1 /* 2 * rfd_ftl.c -- resident flash disk (flash translation layer) 3 * 4 * Copyright (C) 2005 Sean Young <sean@mess.org> 5 * 6 * $Id: rfd_ftl.c,v 1.8 2006/01/15 12:51:44 sean Exp $ 7 * 8 * This type of flash translation layer (FTL) is used by the Embedded BIOS 9 * by General Software. It is known as the Resident Flash Disk (RFD), see: 10 * 11 * http://www.gensw.com/pages/prod/bios/rfd.htm 12 * 13 * based on ftl.c 14 */ 15 16 #include <linux/hdreg.h> 17 #include <linux/init.h> 18 #include <linux/mtd/blktrans.h> 19 #include <linux/mtd/mtd.h> 20 #include <linux/vmalloc.h> 21 #include <linux/slab.h> 22 #include <linux/jiffies.h> 23 24 #include <asm/types.h> 25 26 #define const_cpu_to_le16 __constant_cpu_to_le16 27 28 static int block_size = 0; 29 module_param(block_size, int, 0); 30 MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size"); 31 32 #define PREFIX "rfd_ftl: " 33 34 /* This major has been assigned by device@lanana.org */ 35 #ifndef RFD_FTL_MAJOR 36 #define RFD_FTL_MAJOR 256 37 #endif 38 39 /* Maximum number of partitions in an FTL region */ 40 #define PART_BITS 4 41 42 /* An erase unit should start with this value */ 43 #define RFD_MAGIC 0x9193 44 45 /* the second value is 0xffff or 0xffc8; function unknown */ 46 47 /* the third value is always 0xffff, ignored */ 48 49 /* next is an array of mapping for each corresponding sector */ 50 #define HEADER_MAP_OFFSET 3 51 #define SECTOR_DELETED 0x0000 52 #define SECTOR_ZERO 0xfffe 53 #define SECTOR_FREE 0xffff 54 55 #define SECTOR_SIZE 512 56 57 #define SECTORS_PER_TRACK 63 58 59 struct block { 60 enum { 61 BLOCK_OK, 62 BLOCK_ERASING, 63 BLOCK_ERASED, 64 BLOCK_UNUSED, 65 BLOCK_FAILED 66 } state; 67 int free_sectors; 68 int used_sectors; 69 int erases; 70 u_long offset; 71 }; 72 73 struct partition { 74 struct mtd_blktrans_dev mbd; 75 76 u_int block_size; /* size of erase unit */ 77 u_int total_blocks; /* number of erase units */ 78 u_int header_sectors_per_block; /* header sectors in erase unit */ 79 u_int data_sectors_per_block; /* data sectors in erase unit */ 80 u_int sector_count; /* sectors in translated disk */ 81 u_int header_size; /* bytes in header sector */ 82 int reserved_block; /* block next up for reclaim */ 83 int current_block; /* block to write to */ 84 u16 *header_cache; /* cached header */ 85 86 int is_reclaiming; 87 int cylinders; 88 int errors; 89 u_long *sector_map; 90 struct block *blocks; 91 }; 92 93 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf); 94 95 static int build_block_map(struct partition *part, int block_no) 96 { 97 struct block *block = &part->blocks[block_no]; 98 int i; 99 100 block->offset = part->block_size * block_no; 101 102 if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) { 103 block->state = BLOCK_UNUSED; 104 return -ENOENT; 105 } 106 107 block->state = BLOCK_OK; 108 109 for (i=0; i<part->data_sectors_per_block; i++) { 110 u16 entry; 111 112 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]); 113 114 if (entry == SECTOR_DELETED) 115 continue; 116 117 if (entry == SECTOR_FREE) { 118 block->free_sectors++; 119 continue; 120 } 121 122 if (entry == SECTOR_ZERO) 123 entry = 0; 124 125 if (entry >= part->sector_count) { 126 printk(KERN_WARNING PREFIX 127 "'%s': unit #%d: entry %d corrupt, " 128 "sector %d out of range\n", 129 part->mbd.mtd->name, block_no, i, entry); 130 continue; 131 } 132 133 if (part->sector_map[entry] != -1) { 134 printk(KERN_WARNING PREFIX 135 "'%s': more than one entry for sector %d\n", 136 part->mbd.mtd->name, entry); 137 part->errors = 1; 138 continue; 139 } 140 141 part->sector_map[entry] = block->offset + 142 (i + part->header_sectors_per_block) * SECTOR_SIZE; 143 144 block->used_sectors++; 145 } 146 147 if (block->free_sectors == part->data_sectors_per_block) 148 part->reserved_block = block_no; 149 150 return 0; 151 } 152 153 static int scan_header(struct partition *part) 154 { 155 int sectors_per_block; 156 int i, rc = -ENOMEM; 157 int blocks_found; 158 size_t retlen; 159 160 sectors_per_block = part->block_size / SECTOR_SIZE; 161 part->total_blocks = part->mbd.mtd->size / part->block_size; 162 163 if (part->total_blocks < 2) 164 return -ENOENT; 165 166 /* each erase block has three bytes header, followed by the map */ 167 part->header_sectors_per_block = 168 ((HEADER_MAP_OFFSET + sectors_per_block) * 169 sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE; 170 171 part->data_sectors_per_block = sectors_per_block - 172 part->header_sectors_per_block; 173 174 part->header_size = (HEADER_MAP_OFFSET + 175 part->data_sectors_per_block) * sizeof(u16); 176 177 part->cylinders = (part->data_sectors_per_block * 178 (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK; 179 180 part->sector_count = part->cylinders * SECTORS_PER_TRACK; 181 182 part->current_block = -1; 183 part->reserved_block = -1; 184 part->is_reclaiming = 0; 185 186 part->header_cache = kmalloc(part->header_size, GFP_KERNEL); 187 if (!part->header_cache) 188 goto err; 189 190 part->blocks = kcalloc(part->total_blocks, sizeof(struct block), 191 GFP_KERNEL); 192 if (!part->blocks) 193 goto err; 194 195 part->sector_map = vmalloc(part->sector_count * sizeof(u_long)); 196 if (!part->sector_map) { 197 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for " 198 "sector map", part->mbd.mtd->name); 199 goto err; 200 } 201 202 for (i=0; i<part->sector_count; i++) 203 part->sector_map[i] = -1; 204 205 for (i=0, blocks_found=0; i<part->total_blocks; i++) { 206 rc = part->mbd.mtd->read(part->mbd.mtd, 207 i * part->block_size, part->header_size, 208 &retlen, (u_char*)part->header_cache); 209 210 if (!rc && retlen != part->header_size) 211 rc = -EIO; 212 213 if (rc) 214 goto err; 215 216 if (!build_block_map(part, i)) 217 blocks_found++; 218 } 219 220 if (blocks_found == 0) { 221 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n", 222 part->mbd.mtd->name); 223 rc = -ENOENT; 224 goto err; 225 } 226 227 if (part->reserved_block == -1) { 228 printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n", 229 part->mbd.mtd->name); 230 231 part->errors = 1; 232 } 233 234 return 0; 235 236 err: 237 vfree(part->sector_map); 238 kfree(part->header_cache); 239 kfree(part->blocks); 240 241 return rc; 242 } 243 244 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf) 245 { 246 struct partition *part = (struct partition*)dev; 247 u_long addr; 248 size_t retlen; 249 int rc; 250 251 if (sector >= part->sector_count) 252 return -EIO; 253 254 addr = part->sector_map[sector]; 255 if (addr != -1) { 256 rc = part->mbd.mtd->read(part->mbd.mtd, addr, SECTOR_SIZE, 257 &retlen, (u_char*)buf); 258 if (!rc && retlen != SECTOR_SIZE) 259 rc = -EIO; 260 261 if (rc) { 262 printk(KERN_WARNING PREFIX "error reading '%s' at " 263 "0x%lx\n", part->mbd.mtd->name, addr); 264 return rc; 265 } 266 } else 267 memset(buf, 0, SECTOR_SIZE); 268 269 return 0; 270 } 271 272 static void erase_callback(struct erase_info *erase) 273 { 274 struct partition *part; 275 u16 magic; 276 int i, rc; 277 size_t retlen; 278 279 part = (struct partition*)erase->priv; 280 281 i = erase->addr / part->block_size; 282 if (i >= part->total_blocks || part->blocks[i].offset != erase->addr) { 283 printk(KERN_ERR PREFIX "erase callback for unknown offset %x " 284 "on '%s'\n", erase->addr, part->mbd.mtd->name); 285 return; 286 } 287 288 if (erase->state != MTD_ERASE_DONE) { 289 printk(KERN_WARNING PREFIX "erase failed at 0x%x on '%s', " 290 "state %d\n", erase->addr, 291 part->mbd.mtd->name, erase->state); 292 293 part->blocks[i].state = BLOCK_FAILED; 294 part->blocks[i].free_sectors = 0; 295 part->blocks[i].used_sectors = 0; 296 297 kfree(erase); 298 299 return; 300 } 301 302 magic = const_cpu_to_le16(RFD_MAGIC); 303 304 part->blocks[i].state = BLOCK_ERASED; 305 part->blocks[i].free_sectors = part->data_sectors_per_block; 306 part->blocks[i].used_sectors = 0; 307 part->blocks[i].erases++; 308 309 rc = part->mbd.mtd->write(part->mbd.mtd, 310 part->blocks[i].offset, sizeof(magic), &retlen, 311 (u_char*)&magic); 312 313 if (!rc && retlen != sizeof(magic)) 314 rc = -EIO; 315 316 if (rc) { 317 printk(KERN_ERR PREFIX "'%s': unable to write RFD " 318 "header at 0x%lx\n", 319 part->mbd.mtd->name, 320 part->blocks[i].offset); 321 part->blocks[i].state = BLOCK_FAILED; 322 } 323 else 324 part->blocks[i].state = BLOCK_OK; 325 326 kfree(erase); 327 } 328 329 static int erase_block(struct partition *part, int block) 330 { 331 struct erase_info *erase; 332 int rc = -ENOMEM; 333 334 erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL); 335 if (!erase) 336 goto err; 337 338 erase->mtd = part->mbd.mtd; 339 erase->callback = erase_callback; 340 erase->addr = part->blocks[block].offset; 341 erase->len = part->block_size; 342 erase->priv = (u_long)part; 343 344 part->blocks[block].state = BLOCK_ERASING; 345 part->blocks[block].free_sectors = 0; 346 347 rc = part->mbd.mtd->erase(part->mbd.mtd, erase); 348 349 if (rc) { 350 printk(KERN_ERR PREFIX "erase of region %x,%x on '%s' " 351 "failed\n", erase->addr, erase->len, 352 part->mbd.mtd->name); 353 kfree(erase); 354 } 355 356 err: 357 return rc; 358 } 359 360 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector) 361 { 362 void *sector_data; 363 u16 *map; 364 size_t retlen; 365 int i, rc = -ENOMEM; 366 367 part->is_reclaiming = 1; 368 369 sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL); 370 if (!sector_data) 371 goto err3; 372 373 map = kmalloc(part->header_size, GFP_KERNEL); 374 if (!map) 375 goto err2; 376 377 rc = part->mbd.mtd->read(part->mbd.mtd, 378 part->blocks[block_no].offset, part->header_size, 379 &retlen, (u_char*)map); 380 381 if (!rc && retlen != part->header_size) 382 rc = -EIO; 383 384 if (rc) { 385 printk(KERN_ERR PREFIX "error reading '%s' at " 386 "0x%lx\n", part->mbd.mtd->name, 387 part->blocks[block_no].offset); 388 389 goto err; 390 } 391 392 for (i=0; i<part->data_sectors_per_block; i++) { 393 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]); 394 u_long addr; 395 396 397 if (entry == SECTOR_FREE || entry == SECTOR_DELETED) 398 continue; 399 400 if (entry == SECTOR_ZERO) 401 entry = 0; 402 403 /* already warned about and ignored in build_block_map() */ 404 if (entry >= part->sector_count) 405 continue; 406 407 addr = part->blocks[block_no].offset + 408 (i + part->header_sectors_per_block) * SECTOR_SIZE; 409 410 if (*old_sector == addr) { 411 *old_sector = -1; 412 if (!part->blocks[block_no].used_sectors--) { 413 rc = erase_block(part, block_no); 414 break; 415 } 416 continue; 417 } 418 rc = part->mbd.mtd->read(part->mbd.mtd, addr, 419 SECTOR_SIZE, &retlen, sector_data); 420 421 if (!rc && retlen != SECTOR_SIZE) 422 rc = -EIO; 423 424 if (rc) { 425 printk(KERN_ERR PREFIX "'%s': Unable to " 426 "read sector for relocation\n", 427 part->mbd.mtd->name); 428 429 goto err; 430 } 431 432 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part, 433 entry, sector_data); 434 435 if (rc) 436 goto err; 437 } 438 439 err: 440 kfree(map); 441 err2: 442 kfree(sector_data); 443 err3: 444 part->is_reclaiming = 0; 445 446 return rc; 447 } 448 449 static int reclaim_block(struct partition *part, u_long *old_sector) 450 { 451 int block, best_block, score, old_sector_block; 452 int rc; 453 454 /* we have a race if sync doesn't exist */ 455 if (part->mbd.mtd->sync) 456 part->mbd.mtd->sync(part->mbd.mtd); 457 458 score = 0x7fffffff; /* MAX_INT */ 459 best_block = -1; 460 if (*old_sector != -1) 461 old_sector_block = *old_sector / part->block_size; 462 else 463 old_sector_block = -1; 464 465 for (block=0; block<part->total_blocks; block++) { 466 int this_score; 467 468 if (block == part->reserved_block) 469 continue; 470 471 /* 472 * Postpone reclaiming if there is a free sector as 473 * more removed sectors is more efficient (have to move 474 * less). 475 */ 476 if (part->blocks[block].free_sectors) 477 return 0; 478 479 this_score = part->blocks[block].used_sectors; 480 481 if (block == old_sector_block) 482 this_score--; 483 else { 484 /* no point in moving a full block */ 485 if (part->blocks[block].used_sectors == 486 part->data_sectors_per_block) 487 continue; 488 } 489 490 this_score += part->blocks[block].erases; 491 492 if (this_score < score) { 493 best_block = block; 494 score = this_score; 495 } 496 } 497 498 if (best_block == -1) 499 return -ENOSPC; 500 501 part->current_block = -1; 502 part->reserved_block = best_block; 503 504 pr_debug("reclaim_block: reclaiming block #%d with %d used " 505 "%d free sectors\n", best_block, 506 part->blocks[best_block].used_sectors, 507 part->blocks[best_block].free_sectors); 508 509 if (part->blocks[best_block].used_sectors) 510 rc = move_block_contents(part, best_block, old_sector); 511 else 512 rc = erase_block(part, best_block); 513 514 return rc; 515 } 516 517 /* 518 * IMPROVE: It would be best to choose the block with the most deleted sectors, 519 * because if we fill that one up first it'll have the most chance of having 520 * the least live sectors at reclaim. 521 */ 522 static int find_free_block(struct partition *part) 523 { 524 int block, stop; 525 526 block = part->current_block == -1 ? 527 jiffies % part->total_blocks : part->current_block; 528 stop = block; 529 530 do { 531 if (part->blocks[block].free_sectors && 532 block != part->reserved_block) 533 return block; 534 535 if (part->blocks[block].state == BLOCK_UNUSED) 536 erase_block(part, block); 537 538 if (++block >= part->total_blocks) 539 block = 0; 540 541 } while (block != stop); 542 543 return -1; 544 } 545 546 static int find_writable_block(struct partition *part, u_long *old_sector) 547 { 548 int rc, block; 549 size_t retlen; 550 551 block = find_free_block(part); 552 553 if (block == -1) { 554 if (!part->is_reclaiming) { 555 rc = reclaim_block(part, old_sector); 556 if (rc) 557 goto err; 558 559 block = find_free_block(part); 560 } 561 562 if (block == -1) { 563 rc = -ENOSPC; 564 goto err; 565 } 566 } 567 568 rc = part->mbd.mtd->read(part->mbd.mtd, part->blocks[block].offset, 569 part->header_size, &retlen, (u_char*)part->header_cache); 570 571 if (!rc && retlen != part->header_size) 572 rc = -EIO; 573 574 if (rc) { 575 printk(KERN_ERR PREFIX "'%s': unable to read header at " 576 "0x%lx\n", part->mbd.mtd->name, 577 part->blocks[block].offset); 578 goto err; 579 } 580 581 part->current_block = block; 582 583 err: 584 return rc; 585 } 586 587 static int mark_sector_deleted(struct partition *part, u_long old_addr) 588 { 589 int block, offset, rc; 590 u_long addr; 591 size_t retlen; 592 u16 del = const_cpu_to_le16(SECTOR_DELETED); 593 594 block = old_addr / part->block_size; 595 offset = (old_addr % part->block_size) / SECTOR_SIZE - 596 part->header_sectors_per_block; 597 598 addr = part->blocks[block].offset + 599 (HEADER_MAP_OFFSET + offset) * sizeof(u16); 600 rc = part->mbd.mtd->write(part->mbd.mtd, addr, 601 sizeof(del), &retlen, (u_char*)&del); 602 603 if (!rc && retlen != sizeof(del)) 604 rc = -EIO; 605 606 if (rc) { 607 printk(KERN_ERR PREFIX "error writing '%s' at " 608 "0x%lx\n", part->mbd.mtd->name, addr); 609 if (rc) 610 goto err; 611 } 612 if (block == part->current_block) 613 part->header_cache[offset + HEADER_MAP_OFFSET] = del; 614 615 part->blocks[block].used_sectors--; 616 617 if (!part->blocks[block].used_sectors && 618 !part->blocks[block].free_sectors) 619 rc = erase_block(part, block); 620 621 err: 622 return rc; 623 } 624 625 static int find_free_sector(const struct partition *part, const struct block *block) 626 { 627 int i, stop; 628 629 i = stop = part->data_sectors_per_block - block->free_sectors; 630 631 do { 632 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]) 633 == SECTOR_FREE) 634 return i; 635 636 if (++i == part->data_sectors_per_block) 637 i = 0; 638 } 639 while(i != stop); 640 641 return -1; 642 } 643 644 static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr) 645 { 646 struct partition *part = (struct partition*)dev; 647 struct block *block; 648 u_long addr; 649 int i; 650 int rc; 651 size_t retlen; 652 u16 entry; 653 654 if (part->current_block == -1 || 655 !part->blocks[part->current_block].free_sectors) { 656 657 rc = find_writable_block(part, old_addr); 658 if (rc) 659 goto err; 660 } 661 662 block = &part->blocks[part->current_block]; 663 664 i = find_free_sector(part, block); 665 666 if (i < 0) { 667 rc = -ENOSPC; 668 goto err; 669 } 670 671 addr = (i + part->header_sectors_per_block) * SECTOR_SIZE + 672 block->offset; 673 rc = part->mbd.mtd->write(part->mbd.mtd, 674 addr, SECTOR_SIZE, &retlen, (u_char*)buf); 675 676 if (!rc && retlen != SECTOR_SIZE) 677 rc = -EIO; 678 679 if (rc) { 680 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n", 681 part->mbd.mtd->name, addr); 682 if (rc) 683 goto err; 684 } 685 686 part->sector_map[sector] = addr; 687 688 entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector); 689 690 part->header_cache[i + HEADER_MAP_OFFSET] = entry; 691 692 addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16); 693 rc = part->mbd.mtd->write(part->mbd.mtd, addr, 694 sizeof(entry), &retlen, (u_char*)&entry); 695 696 if (!rc && retlen != sizeof(entry)) 697 rc = -EIO; 698 699 if (rc) { 700 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n", 701 part->mbd.mtd->name, addr); 702 if (rc) 703 goto err; 704 } 705 block->used_sectors++; 706 block->free_sectors--; 707 708 err: 709 return rc; 710 } 711 712 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf) 713 { 714 struct partition *part = (struct partition*)dev; 715 u_long old_addr; 716 int i; 717 int rc = 0; 718 719 pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector); 720 721 if (part->reserved_block == -1) { 722 rc = -EACCES; 723 goto err; 724 } 725 726 if (sector >= part->sector_count) { 727 rc = -EIO; 728 goto err; 729 } 730 731 old_addr = part->sector_map[sector]; 732 733 for (i=0; i<SECTOR_SIZE; i++) { 734 if (!buf[i]) 735 continue; 736 737 rc = do_writesect(dev, sector, buf, &old_addr); 738 if (rc) 739 goto err; 740 break; 741 } 742 743 if (i == SECTOR_SIZE) 744 part->sector_map[sector] = -1; 745 746 if (old_addr != -1) 747 rc = mark_sector_deleted(part, old_addr); 748 749 err: 750 return rc; 751 } 752 753 static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) 754 { 755 struct partition *part = (struct partition*)dev; 756 757 geo->heads = 1; 758 geo->sectors = SECTORS_PER_TRACK; 759 geo->cylinders = part->cylinders; 760 761 return 0; 762 } 763 764 static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) 765 { 766 struct partition *part; 767 768 if (mtd->type != MTD_NORFLASH) 769 return; 770 771 part = kzalloc(sizeof(struct partition), GFP_KERNEL); 772 if (!part) 773 return; 774 775 part->mbd.mtd = mtd; 776 777 if (block_size) 778 part->block_size = block_size; 779 else { 780 if (!mtd->erasesize) { 781 printk(KERN_WARNING PREFIX "please provide block_size"); 782 goto out; 783 } else 784 part->block_size = mtd->erasesize; 785 } 786 787 if (scan_header(part) == 0) { 788 part->mbd.size = part->sector_count; 789 part->mbd.tr = tr; 790 part->mbd.devnum = -1; 791 if (!(mtd->flags & MTD_WRITEABLE)) 792 part->mbd.readonly = 1; 793 else if (part->errors) { 794 printk(KERN_WARNING PREFIX "'%s': errors found, " 795 "setting read-only\n", mtd->name); 796 part->mbd.readonly = 1; 797 } 798 799 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n", 800 mtd->name, mtd->type, mtd->flags); 801 802 if (!add_mtd_blktrans_dev((void*)part)) 803 return; 804 } 805 out: 806 kfree(part); 807 } 808 809 static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev) 810 { 811 struct partition *part = (struct partition*)dev; 812 int i; 813 814 for (i=0; i<part->total_blocks; i++) { 815 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n", 816 part->mbd.mtd->name, i, part->blocks[i].erases); 817 } 818 819 del_mtd_blktrans_dev(dev); 820 vfree(part->sector_map); 821 kfree(part->header_cache); 822 kfree(part->blocks); 823 kfree(part); 824 } 825 826 static struct mtd_blktrans_ops rfd_ftl_tr = { 827 .name = "rfd", 828 .major = RFD_FTL_MAJOR, 829 .part_bits = PART_BITS, 830 .blksize = SECTOR_SIZE, 831 832 .readsect = rfd_ftl_readsect, 833 .writesect = rfd_ftl_writesect, 834 .getgeo = rfd_ftl_getgeo, 835 .add_mtd = rfd_ftl_add_mtd, 836 .remove_dev = rfd_ftl_remove_dev, 837 .owner = THIS_MODULE, 838 }; 839 840 static int __init init_rfd_ftl(void) 841 { 842 return register_mtd_blktrans(&rfd_ftl_tr); 843 } 844 845 static void __exit cleanup_rfd_ftl(void) 846 { 847 deregister_mtd_blktrans(&rfd_ftl_tr); 848 } 849 850 module_init(init_rfd_ftl); 851 module_exit(cleanup_rfd_ftl); 852 853 MODULE_LICENSE("GPL"); 854 MODULE_AUTHOR("Sean Young <sean@mess.org>"); 855 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, " 856 "used by General Software's Embedded BIOS"); 857 858