1/* 2 * rfd_ftl.c -- resident flash disk (flash translation layer) 3 * 4 * Copyright �� 2005 Sean Young <sean@mess.org> 5 * 6 * This type of flash translation layer (FTL) is used by the Embedded BIOS 7 * by General Software. It is known as the Resident Flash Disk (RFD), see: 8 * 9 * http://www.gensw.com/pages/prod/bios/rfd.htm 10 * 11 * based on ftl.c 12 */ 13 14#include <linux/hdreg.h> 15#include <linux/init.h> 16#include <linux/mtd/blktrans.h> 17#include <linux/mtd/mtd.h> 18#include <linux/vmalloc.h> 19#include <linux/slab.h> 20#include <linux/jiffies.h> 21 22#include <asm/types.h> 23 24static int block_size = 0; 25module_param(block_size, int, 0); 26MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size"); 27 28#define PREFIX "rfd_ftl: " 29 30/* This major has been assigned by device@lanana.org */ 31#ifndef RFD_FTL_MAJOR 32#define RFD_FTL_MAJOR 256 33#endif 34 35/* Maximum number of partitions in an FTL region */ 36#define PART_BITS 4 37 38/* An erase unit should start with this value */ 39#define RFD_MAGIC 0x9193 40 41/* the second value is 0xffff or 0xffc8; function unknown */ 42 43/* the third value is always 0xffff, ignored */ 44 45/* next is an array of mapping for each corresponding sector */ 46#define HEADER_MAP_OFFSET 3 47#define SECTOR_DELETED 0x0000 48#define SECTOR_ZERO 0xfffe 49#define SECTOR_FREE 0xffff 50 51#define SECTOR_SIZE 512 52 53#define SECTORS_PER_TRACK 63 54 55struct block { 56 enum { 57 BLOCK_OK, 58 BLOCK_ERASING, 59 BLOCK_ERASED, 60 BLOCK_UNUSED, 61 BLOCK_FAILED 62 } state; 63 int free_sectors; 64 int used_sectors; 65 int erases; 66 u_long offset; 67}; 68 69struct partition { 70 struct mtd_blktrans_dev mbd; 71 72 u_int block_size; /* size of erase unit */ 73 u_int total_blocks; /* number of erase units */ 74 u_int header_sectors_per_block; /* header sectors in erase unit */ 75 u_int data_sectors_per_block; /* data sectors in erase unit */ 76 u_int sector_count; /* sectors in translated disk */ 77 u_int header_size; /* bytes in header sector */ 78 int reserved_block; /* block next up for reclaim */ 79 int current_block; /* block to write to */ 80 u16 *header_cache; /* cached header */ 81 82 int is_reclaiming; 83 int cylinders; 84 int errors; 85 u_long *sector_map; 86 struct block *blocks; 87}; 88 89static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf); 90 91static int build_block_map(struct partition *part, int block_no) 92{ 93 struct block *block = &part->blocks[block_no]; 94 int i; 95 96 block->offset = part->block_size * block_no; 97 98 if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) { 99 block->state = BLOCK_UNUSED; 100 return -ENOENT; 101 } 102 103 block->state = BLOCK_OK; 104 105 for (i=0; i<part->data_sectors_per_block; i++) { 106 u16 entry; 107 108 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]); 109 110 if (entry == SECTOR_DELETED) 111 continue; 112 113 if (entry == SECTOR_FREE) { 114 block->free_sectors++; 115 continue; 116 } 117 118 if (entry == SECTOR_ZERO) 119 entry = 0; 120 121 if (entry >= part->sector_count) { 122 printk(KERN_WARNING PREFIX 123 "'%s': unit #%d: entry %d corrupt, " 124 "sector %d out of range\n", 125 part->mbd.mtd->name, block_no, i, entry); 126 continue; 127 } 128 129 if (part->sector_map[entry] != -1) { 130 printk(KERN_WARNING PREFIX 131 "'%s': more than one entry for sector %d\n", 132 part->mbd.mtd->name, entry); 133 part->errors = 1; 134 continue; 135 } 136 137 part->sector_map[entry] = block->offset + 138 (i + part->header_sectors_per_block) * SECTOR_SIZE; 139 140 block->used_sectors++; 141 } 142 143 if (block->free_sectors == part->data_sectors_per_block) 144 part->reserved_block = block_no; 145 146 return 0; 147} 148 149static int scan_header(struct partition *part) 150{ 151 int sectors_per_block; 152 int i, rc = -ENOMEM; 153 int blocks_found; 154 size_t retlen; 155 156 sectors_per_block = part->block_size / SECTOR_SIZE; 157 part->total_blocks = (u32)part->mbd.mtd->size / part->block_size; 158 159 if (part->total_blocks < 2) 160 return -ENOENT; 161 162 /* each erase block has three bytes header, followed by the map */ 163 part->header_sectors_per_block = 164 ((HEADER_MAP_OFFSET + sectors_per_block) * 165 sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE; 166 167 part->data_sectors_per_block = sectors_per_block - 168 part->header_sectors_per_block; 169 170 part->header_size = (HEADER_MAP_OFFSET + 171 part->data_sectors_per_block) * sizeof(u16); 172 173 part->cylinders = (part->data_sectors_per_block * 174 (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK; 175 176 part->sector_count = part->cylinders * SECTORS_PER_TRACK; 177 178 part->current_block = -1; 179 part->reserved_block = -1; 180 part->is_reclaiming = 0; 181 182 part->header_cache = kmalloc(part->header_size, GFP_KERNEL); 183 if (!part->header_cache) 184 goto err; 185 186 part->blocks = kcalloc(part->total_blocks, sizeof(struct block), 187 GFP_KERNEL); 188 if (!part->blocks) 189 goto err; 190 191 part->sector_map = vmalloc(part->sector_count * sizeof(u_long)); 192 if (!part->sector_map) { 193 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for " 194 "sector map", part->mbd.mtd->name); 195 goto err; 196 } 197 198 for (i=0; i<part->sector_count; i++) 199 part->sector_map[i] = -1; 200 201 for (i=0, blocks_found=0; i<part->total_blocks; i++) { 202 rc = part->mbd.mtd->read(part->mbd.mtd, 203 i * part->block_size, part->header_size, 204 &retlen, (u_char*)part->header_cache); 205 206 if (!rc && retlen != part->header_size) 207 rc = -EIO; 208 209 if (rc) 210 goto err; 211 212 if (!build_block_map(part, i)) 213 blocks_found++; 214 } 215 216 if (blocks_found == 0) { 217 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n", 218 part->mbd.mtd->name); 219 rc = -ENOENT; 220 goto err; 221 } 222 223 if (part->reserved_block == -1) { 224 printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n", 225 part->mbd.mtd->name); 226 227 part->errors = 1; 228 } 229 230 return 0; 231 232err: 233 vfree(part->sector_map); 234 kfree(part->header_cache); 235 kfree(part->blocks); 236 237 return rc; 238} 239 240static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf) 241{ 242 struct partition *part = (struct partition*)dev; 243 u_long addr; 244 size_t retlen; 245 int rc; 246 247 if (sector >= part->sector_count) 248 return -EIO; 249 250 addr = part->sector_map[sector]; 251 if (addr != -1) { 252 rc = part->mbd.mtd->read(part->mbd.mtd, addr, SECTOR_SIZE, 253 &retlen, (u_char*)buf); 254 if (!rc && retlen != SECTOR_SIZE) 255 rc = -EIO; 256 257 if (rc) { 258 printk(KERN_WARNING PREFIX "error reading '%s' at " 259 "0x%lx\n", part->mbd.mtd->name, addr); 260 return rc; 261 } 262 } else 263 memset(buf, 0, SECTOR_SIZE); 264 265 return 0; 266} 267 268static void erase_callback(struct erase_info *erase) 269{ 270 struct partition *part; 271 u16 magic; 272 int i, rc; 273 size_t retlen; 274 275 part = (struct partition*)erase->priv; 276 277 i = (u32)erase->addr / part->block_size; 278 if (i >= part->total_blocks || part->blocks[i].offset != erase->addr || 279 erase->addr > UINT_MAX) { 280 printk(KERN_ERR PREFIX "erase callback for unknown offset %llx " 281 "on '%s'\n", (unsigned long long)erase->addr, part->mbd.mtd->name); 282 return; 283 } 284 285 if (erase->state != MTD_ERASE_DONE) { 286 printk(KERN_WARNING PREFIX "erase failed at 0x%llx on '%s', " 287 "state %d\n", (unsigned long long)erase->addr, 288 part->mbd.mtd->name, erase->state); 289 290 part->blocks[i].state = BLOCK_FAILED; 291 part->blocks[i].free_sectors = 0; 292 part->blocks[i].used_sectors = 0; 293 294 kfree(erase); 295 296 return; 297 } 298 299 magic = cpu_to_le16(RFD_MAGIC); 300 301 part->blocks[i].state = BLOCK_ERASED; 302 part->blocks[i].free_sectors = part->data_sectors_per_block; 303 part->blocks[i].used_sectors = 0; 304 part->blocks[i].erases++; 305 306 rc = part->mbd.mtd->write(part->mbd.mtd, 307 part->blocks[i].offset, sizeof(magic), &retlen, 308 (u_char*)&magic); 309 310 if (!rc && retlen != sizeof(magic)) 311 rc = -EIO; 312 313 if (rc) { 314 printk(KERN_ERR PREFIX "'%s': unable to write RFD " 315 "header at 0x%lx\n", 316 part->mbd.mtd->name, 317 part->blocks[i].offset); 318 part->blocks[i].state = BLOCK_FAILED; 319 } 320 else 321 part->blocks[i].state = BLOCK_OK; 322 323 kfree(erase); 324} 325 326static int erase_block(struct partition *part, int block) 327{ 328 struct erase_info *erase; 329 int rc = -ENOMEM; 330 331 erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL); 332 if (!erase) 333 goto err; 334 335 erase->mtd = part->mbd.mtd; 336 erase->callback = erase_callback; 337 erase->addr = part->blocks[block].offset; 338 erase->len = part->block_size; 339 erase->priv = (u_long)part; 340 341 part->blocks[block].state = BLOCK_ERASING; 342 part->blocks[block].free_sectors = 0; 343 344 rc = part->mbd.mtd->erase(part->mbd.mtd, erase); 345 346 if (rc) { 347 printk(KERN_ERR PREFIX "erase of region %llx,%llx on '%s' " 348 "failed\n", (unsigned long long)erase->addr, 349 (unsigned long long)erase->len, part->mbd.mtd->name); 350 kfree(erase); 351 } 352 353err: 354 return rc; 355} 356 357static int move_block_contents(struct partition *part, int block_no, u_long *old_sector) 358{ 359 void *sector_data; 360 u16 *map; 361 size_t retlen; 362 int i, rc = -ENOMEM; 363 364 part->is_reclaiming = 1; 365 366 sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL); 367 if (!sector_data) 368 goto err3; 369 370 map = kmalloc(part->header_size, GFP_KERNEL); 371 if (!map) 372 goto err2; 373 374 rc = part->mbd.mtd->read(part->mbd.mtd, 375 part->blocks[block_no].offset, part->header_size, 376 &retlen, (u_char*)map); 377 378 if (!rc && retlen != part->header_size) 379 rc = -EIO; 380 381 if (rc) { 382 printk(KERN_ERR PREFIX "error reading '%s' at " 383 "0x%lx\n", part->mbd.mtd->name, 384 part->blocks[block_no].offset); 385 386 goto err; 387 } 388 389 for (i=0; i<part->data_sectors_per_block; i++) { 390 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]); 391 u_long addr; 392 393 394 if (entry == SECTOR_FREE || entry == SECTOR_DELETED) 395 continue; 396 397 if (entry == SECTOR_ZERO) 398 entry = 0; 399 400 /* already warned about and ignored in build_block_map() */ 401 if (entry >= part->sector_count) 402 continue; 403 404 addr = part->blocks[block_no].offset + 405 (i + part->header_sectors_per_block) * SECTOR_SIZE; 406 407 if (*old_sector == addr) { 408 *old_sector = -1; 409 if (!part->blocks[block_no].used_sectors--) { 410 rc = erase_block(part, block_no); 411 break; 412 } 413 continue; 414 } 415 rc = part->mbd.mtd->read(part->mbd.mtd, addr, 416 SECTOR_SIZE, &retlen, sector_data); 417 418 if (!rc && retlen != SECTOR_SIZE) 419 rc = -EIO; 420 421 if (rc) { 422 printk(KERN_ERR PREFIX "'%s': Unable to " 423 "read sector for relocation\n", 424 part->mbd.mtd->name); 425 426 goto err; 427 } 428 429 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part, 430 entry, sector_data); 431 432 if (rc) 433 goto err; 434 } 435 436err: 437 kfree(map); 438err2: 439 kfree(sector_data); 440err3: 441 part->is_reclaiming = 0; 442 443 return rc; 444} 445 446static int reclaim_block(struct partition *part, u_long *old_sector) 447{ 448 int block, best_block, score, old_sector_block; 449 int rc; 450 451 /* we have a race if sync doesn't exist */ 452 if (part->mbd.mtd->sync) 453 part->mbd.mtd->sync(part->mbd.mtd); 454 455 score = 0x7fffffff; /* MAX_INT */ 456 best_block = -1; 457 if (*old_sector != -1) 458 old_sector_block = *old_sector / part->block_size; 459 else 460 old_sector_block = -1; 461 462 for (block=0; block<part->total_blocks; block++) { 463 int this_score; 464 465 if (block == part->reserved_block) 466 continue; 467 468 /* 469 * Postpone reclaiming if there is a free sector as 470 * more removed sectors is more efficient (have to move 471 * less). 472 */ 473 if (part->blocks[block].free_sectors) 474 return 0; 475 476 this_score = part->blocks[block].used_sectors; 477 478 if (block == old_sector_block) 479 this_score--; 480 else { 481 /* no point in moving a full block */ 482 if (part->blocks[block].used_sectors == 483 part->data_sectors_per_block) 484 continue; 485 } 486 487 this_score += part->blocks[block].erases; 488 489 if (this_score < score) { 490 best_block = block; 491 score = this_score; 492 } 493 } 494 495 if (best_block == -1) 496 return -ENOSPC; 497 498 part->current_block = -1; 499 part->reserved_block = best_block; 500 501 pr_debug("reclaim_block: reclaiming block #%d with %d used " 502 "%d free sectors\n", best_block, 503 part->blocks[best_block].used_sectors, 504 part->blocks[best_block].free_sectors); 505 506 if (part->blocks[best_block].used_sectors) 507 rc = move_block_contents(part, best_block, old_sector); 508 else 509 rc = erase_block(part, best_block); 510 511 return rc; 512} 513 514/* 515 * IMPROVE: It would be best to choose the block with the most deleted sectors, 516 * because if we fill that one up first it'll have the most chance of having 517 * the least live sectors at reclaim. 518 */ 519static int find_free_block(struct partition *part) 520{ 521 int block, stop; 522 523 block = part->current_block == -1 ? 524 jiffies % part->total_blocks : part->current_block; 525 stop = block; 526 527 do { 528 if (part->blocks[block].free_sectors && 529 block != part->reserved_block) 530 return block; 531 532 if (part->blocks[block].state == BLOCK_UNUSED) 533 erase_block(part, block); 534 535 if (++block >= part->total_blocks) 536 block = 0; 537 538 } while (block != stop); 539 540 return -1; 541} 542 543static int find_writable_block(struct partition *part, u_long *old_sector) 544{ 545 int rc, block; 546 size_t retlen; 547 548 block = find_free_block(part); 549 550 if (block == -1) { 551 if (!part->is_reclaiming) { 552 rc = reclaim_block(part, old_sector); 553 if (rc) 554 goto err; 555 556 block = find_free_block(part); 557 } 558 559 if (block == -1) { 560 rc = -ENOSPC; 561 goto err; 562 } 563 } 564 565 rc = part->mbd.mtd->read(part->mbd.mtd, part->blocks[block].offset, 566 part->header_size, &retlen, (u_char*)part->header_cache); 567 568 if (!rc && retlen != part->header_size) 569 rc = -EIO; 570 571 if (rc) { 572 printk(KERN_ERR PREFIX "'%s': unable to read header at " 573 "0x%lx\n", part->mbd.mtd->name, 574 part->blocks[block].offset); 575 goto err; 576 } 577 578 part->current_block = block; 579 580err: 581 return rc; 582} 583 584static int mark_sector_deleted(struct partition *part, u_long old_addr) 585{ 586 int block, offset, rc; 587 u_long addr; 588 size_t retlen; 589 u16 del = cpu_to_le16(SECTOR_DELETED); 590 591 block = old_addr / part->block_size; 592 offset = (old_addr % part->block_size) / SECTOR_SIZE - 593 part->header_sectors_per_block; 594 595 addr = part->blocks[block].offset + 596 (HEADER_MAP_OFFSET + offset) * sizeof(u16); 597 rc = part->mbd.mtd->write(part->mbd.mtd, addr, 598 sizeof(del), &retlen, (u_char*)&del); 599 600 if (!rc && retlen != sizeof(del)) 601 rc = -EIO; 602 603 if (rc) { 604 printk(KERN_ERR PREFIX "error writing '%s' at " 605 "0x%lx\n", part->mbd.mtd->name, addr); 606 if (rc) 607 goto err; 608 } 609 if (block == part->current_block) 610 part->header_cache[offset + HEADER_MAP_OFFSET] = del; 611 612 part->blocks[block].used_sectors--; 613 614 if (!part->blocks[block].used_sectors && 615 !part->blocks[block].free_sectors) 616 rc = erase_block(part, block); 617 618err: 619 return rc; 620} 621 622static int find_free_sector(const struct partition *part, const struct block *block) 623{ 624 int i, stop; 625 626 i = stop = part->data_sectors_per_block - block->free_sectors; 627 628 do { 629 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]) 630 == SECTOR_FREE) 631 return i; 632 633 if (++i == part->data_sectors_per_block) 634 i = 0; 635 } 636 while(i != stop); 637 638 return -1; 639} 640 641static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr) 642{ 643 struct partition *part = (struct partition*)dev; 644 struct block *block; 645 u_long addr; 646 int i; 647 int rc; 648 size_t retlen; 649 u16 entry; 650 651 if (part->current_block == -1 || 652 !part->blocks[part->current_block].free_sectors) { 653 654 rc = find_writable_block(part, old_addr); 655 if (rc) 656 goto err; 657 } 658 659 block = &part->blocks[part->current_block]; 660 661 i = find_free_sector(part, block); 662 663 if (i < 0) { 664 rc = -ENOSPC; 665 goto err; 666 } 667 668 addr = (i + part->header_sectors_per_block) * SECTOR_SIZE + 669 block->offset; 670 rc = part->mbd.mtd->write(part->mbd.mtd, 671 addr, SECTOR_SIZE, &retlen, (u_char*)buf); 672 673 if (!rc && retlen != SECTOR_SIZE) 674 rc = -EIO; 675 676 if (rc) { 677 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n", 678 part->mbd.mtd->name, addr); 679 if (rc) 680 goto err; 681 } 682 683 part->sector_map[sector] = addr; 684 685 entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector); 686 687 part->header_cache[i + HEADER_MAP_OFFSET] = entry; 688 689 addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16); 690 rc = part->mbd.mtd->write(part->mbd.mtd, addr, 691 sizeof(entry), &retlen, (u_char*)&entry); 692 693 if (!rc && retlen != sizeof(entry)) 694 rc = -EIO; 695 696 if (rc) { 697 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n", 698 part->mbd.mtd->name, addr); 699 if (rc) 700 goto err; 701 } 702 block->used_sectors++; 703 block->free_sectors--; 704 705err: 706 return rc; 707} 708 709static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf) 710{ 711 struct partition *part = (struct partition*)dev; 712 u_long old_addr; 713 int i; 714 int rc = 0; 715 716 pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector); 717 718 if (part->reserved_block == -1) { 719 rc = -EACCES; 720 goto err; 721 } 722 723 if (sector >= part->sector_count) { 724 rc = -EIO; 725 goto err; 726 } 727 728 old_addr = part->sector_map[sector]; 729 730 for (i=0; i<SECTOR_SIZE; i++) { 731 if (!buf[i]) 732 continue; 733 734 rc = do_writesect(dev, sector, buf, &old_addr); 735 if (rc) 736 goto err; 737 break; 738 } 739 740 if (i == SECTOR_SIZE) 741 part->sector_map[sector] = -1; 742 743 if (old_addr != -1) 744 rc = mark_sector_deleted(part, old_addr); 745 746err: 747 return rc; 748} 749 750static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) 751{ 752 struct partition *part = (struct partition*)dev; 753 754 geo->heads = 1; 755 geo->sectors = SECTORS_PER_TRACK; 756 geo->cylinders = part->cylinders; 757 758 return 0; 759} 760 761static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) 762{ 763 struct partition *part; 764 765 if (mtd->type != MTD_NORFLASH || mtd->size > UINT_MAX) 766 return; 767 768 part = kzalloc(sizeof(struct partition), GFP_KERNEL); 769 if (!part) 770 return; 771 772 part->mbd.mtd = mtd; 773 774 if (block_size) 775 part->block_size = block_size; 776 else { 777 if (!mtd->erasesize) { 778 printk(KERN_WARNING PREFIX "please provide block_size"); 779 goto out; 780 } else 781 part->block_size = mtd->erasesize; 782 } 783 784 if (scan_header(part) == 0) { 785 part->mbd.size = part->sector_count; 786 part->mbd.tr = tr; 787 part->mbd.devnum = -1; 788 if (!(mtd->flags & MTD_WRITEABLE)) 789 part->mbd.readonly = 1; 790 else if (part->errors) { 791 printk(KERN_WARNING PREFIX "'%s': errors found, " 792 "setting read-only\n", mtd->name); 793 part->mbd.readonly = 1; 794 } 795 796 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n", 797 mtd->name, mtd->type, mtd->flags); 798 799 if (!add_mtd_blktrans_dev((void*)part)) 800 return; 801 } 802out: 803 kfree(part); 804} 805 806static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev) 807{ 808 struct partition *part = (struct partition*)dev; 809 int i; 810 811 for (i=0; i<part->total_blocks; i++) { 812 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n", 813 part->mbd.mtd->name, i, part->blocks[i].erases); 814 } 815 816 del_mtd_blktrans_dev(dev); 817 vfree(part->sector_map); 818 kfree(part->header_cache); 819 kfree(part->blocks); 820} 821 822static struct mtd_blktrans_ops rfd_ftl_tr = { 823 .name = "rfd", 824 .major = RFD_FTL_MAJOR, 825 .part_bits = PART_BITS, 826 .blksize = SECTOR_SIZE, 827 828 .readsect = rfd_ftl_readsect, 829 .writesect = rfd_ftl_writesect, 830 .getgeo = rfd_ftl_getgeo, 831 .add_mtd = rfd_ftl_add_mtd, 832 .remove_dev = rfd_ftl_remove_dev, 833 .owner = THIS_MODULE, 834}; 835 836static int __init init_rfd_ftl(void) 837{ 838 return register_mtd_blktrans(&rfd_ftl_tr); 839} 840 841static void __exit cleanup_rfd_ftl(void) 842{ 843 deregister_mtd_blktrans(&rfd_ftl_tr); 844} 845 846module_init(init_rfd_ftl); 847module_exit(cleanup_rfd_ftl); 848 849MODULE_LICENSE("GPL"); 850MODULE_AUTHOR("Sean Young <sean@mess.org>"); 851MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, " 852 "used by General Software's Embedded BIOS"); 853