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Linux 2.6.17.7
[linux/fpc-iii.git] / drivers / mtd / rfd_ftl.c
bloba3e00a4635a5392180290e6d9b41d6bfd2fb07a8
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 1.5 2005/11/07 11:14:21 gleixner 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_FAILED
65 } state;
66 int free_sectors;
67 int used_sectors;
68 int erases;
69 u_long offset;
70 };
71
72 struct partition {
73 struct mtd_blktrans_dev mbd;
74
75 u_int block_size; /* size of erase unit */
76 u_int total_blocks; /* number of erase units */
77 u_int header_sectors_per_block; /* header sectors in erase unit */
78 u_int data_sectors_per_block; /* data sectors in erase unit */
79 u_int sector_count; /* sectors in translated disk */
80 u_int header_size; /* bytes in header sector */
81 int reserved_block; /* block next up for reclaim */
82 int current_block; /* block to write to */
83 u16 *header_cache; /* cached header */
84
85 int is_reclaiming;
86 int cylinders;
87 int errors;
88 u_long *sector_map;
89 struct block *blocks;
90 };
91
92 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf);
93
94 static int build_block_map(struct partition *part, int block_no)
95 {
96 struct block *block = &part->blocks[block_no];
97 int i;
98
99 block->offset = part->block_size * block_no;
100
101 if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) {
102 block->state = BLOCK_ERASED; /* assumption */
103 block->free_sectors = part->data_sectors_per_block;
104 part->reserved_block = block_no;
105 return 1;
106 }
107
108 block->state = BLOCK_OK;
109
110 for (i=0; i<part->data_sectors_per_block; i++) {
111 u16 entry;
112
113 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
114
115 if (entry == SECTOR_DELETED)
116 continue;
117
118 if (entry == SECTOR_FREE) {
119 block->free_sectors++;
120 continue;
121 }
122
123 if (entry == SECTOR_ZERO)
124 entry = 0;
125
126 if (entry >= part->sector_count) {
127 printk(KERN_NOTICE PREFIX
128 "'%s': unit #%d: entry %d corrupt, "
129 "sector %d out of range\n",
130 part->mbd.mtd->name, block_no, i, entry);
131 continue;
132 }
133
134 if (part->sector_map[entry] != -1) {
135 printk(KERN_NOTICE PREFIX
136 "'%s': more than one entry for sector %d\n",
137 part->mbd.mtd->name, entry);
138 part->errors = 1;
139 continue;
140 }
141
142 part->sector_map[entry] = block->offset +
143 (i + part->header_sectors_per_block) * SECTOR_SIZE;
144
145 block->used_sectors++;
146 }
147
148 if (block->free_sectors == part->data_sectors_per_block)
149 part->reserved_block = block_no;
150
151 return 0;
152 }
153
154 static int scan_header(struct partition *part)
155 {
156 int sectors_per_block;
157 int i, rc = -ENOMEM;
158 int blocks_found;
159 size_t retlen;
160
161 sectors_per_block = part->block_size / SECTOR_SIZE;
162 part->total_blocks = part->mbd.mtd->size / part->block_size;
163
164 if (part->total_blocks < 2)
165 return -ENOENT;
166
167 /* each erase block has three bytes header, followed by the map */
168 part->header_sectors_per_block =
169 ((HEADER_MAP_OFFSET + sectors_per_block) *
170 sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
171
172 part->data_sectors_per_block = sectors_per_block -
173 part->header_sectors_per_block;
174
175 part->header_size = (HEADER_MAP_OFFSET +
176 part->data_sectors_per_block) * sizeof(u16);
177
178 part->cylinders = (part->data_sectors_per_block *
179 (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
180
181 part->sector_count = part->cylinders * SECTORS_PER_TRACK;
182
183 part->current_block = -1;
184 part->reserved_block = -1;
185 part->is_reclaiming = 0;
186
187 part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
188 if (!part->header_cache)
189 goto err;
190
191 part->blocks = kcalloc(part->total_blocks, sizeof(struct block),
192 GFP_KERNEL);
193 if (!part->blocks)
194 goto err;
195
196 part->sector_map = vmalloc(part->sector_count * sizeof(u_long));
197 if (!part->sector_map) {
198 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for "
199 "sector map", part->mbd.mtd->name);
200 goto err;
201 }
202
203 for (i=0; i<part->sector_count; i++)
204 part->sector_map[i] = -1;
205
206 for (i=0, blocks_found=0; i<part->total_blocks; i++) {
207 rc = part->mbd.mtd->read(part->mbd.mtd,
208 i * part->block_size, part->header_size,
209 &retlen, (u_char*)part->header_cache);
210
211 if (!rc && retlen != part->header_size)
212 rc = -EIO;
213
214 if (rc)
215 goto err;
216
217 if (!build_block_map(part, i))
218 blocks_found++;
219 }
220
221 if (blocks_found == 0) {
222 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
223 part->mbd.mtd->name);
224 rc = -ENOENT;
225 goto err;
226 }
227
228 if (part->reserved_block == -1) {
229 printk(KERN_NOTICE PREFIX "'%s': no empty erase unit found\n",
230 part->mbd.mtd->name);
231
232 part->errors = 1;
233 }
234
235 return 0;
236
237 err:
238 vfree(part->sector_map);
239 kfree(part->header_cache);
240 kfree(part->blocks);
241
242 return rc;
243 }
244
245 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
246 {
247 struct partition *part = (struct partition*)dev;
248 u_long addr;
249 size_t retlen;
250 int rc;
251
252 if (sector >= part->sector_count)
253 return -EIO;
254
255 addr = part->sector_map[sector];
256 if (addr != -1) {
257 rc = part->mbd.mtd->read(part->mbd.mtd, addr, SECTOR_SIZE,
258 &retlen, (u_char*)buf);
259 if (!rc && retlen != SECTOR_SIZE)
260 rc = -EIO;
261
262 if (rc) {
263 printk(KERN_WARNING PREFIX "error reading '%s' at "
264 "0x%lx\n", part->mbd.mtd->name, addr);
265 return rc;
266 }
267 } else
268 memset(buf, 0, SECTOR_SIZE);
269
270 return 0;
271 }
272
273 static void erase_callback(struct erase_info *erase)
274 {
275 struct partition *part;
276 u16 magic;
277 int i, rc;
278 size_t retlen;
279
280 part = (struct partition*)erase->priv;
281
282 i = erase->addr / part->block_size;
283 if (i >= part->total_blocks || part->blocks[i].offset != erase->addr) {
284 printk(KERN_ERR PREFIX "erase callback for unknown offset %x "
285 "on '%s'\n", erase->addr, part->mbd.mtd->name);
286 return;
287 }
288
289 if (erase->state != MTD_ERASE_DONE) {
290 printk(KERN_WARNING PREFIX "erase failed at 0x%x on '%s', "
291 "state %d\n", erase->addr,
292 part->mbd.mtd->name, erase->state);
293
294 part->blocks[i].state = BLOCK_FAILED;
295 part->blocks[i].free_sectors = 0;
296 part->blocks[i].used_sectors = 0;
297
298 kfree(erase);
299
300 return;
301 }
302
303 magic = const_cpu_to_le16(RFD_MAGIC);
304
305 part->blocks[i].state = BLOCK_ERASED;
306 part->blocks[i].free_sectors = part->data_sectors_per_block;
307 part->blocks[i].used_sectors = 0;
308 part->blocks[i].erases++;
309
310 rc = part->mbd.mtd->write(part->mbd.mtd,
311 part->blocks[i].offset, sizeof(magic), &retlen,
312 (u_char*)&magic);
313
314 if (!rc && retlen != sizeof(magic))
315 rc = -EIO;
316
317 if (rc) {
318 printk(KERN_NOTICE PREFIX "'%s': unable to write RFD "
319 "header at 0x%lx\n",
320 part->mbd.mtd->name,
321 part->blocks[i].offset);
322 part->blocks[i].state = BLOCK_FAILED;
323 }
324 else
325 part->blocks[i].state = BLOCK_OK;
326
327 kfree(erase);
328 }
329
330 static int erase_block(struct partition *part, int block)
331 {
332 struct erase_info *erase;
333 int rc = -ENOMEM;
334
335 erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
336 if (!erase)
337 goto err;
338
339 erase->mtd = part->mbd.mtd;
340 erase->callback = erase_callback;
341 erase->addr = part->blocks[block].offset;
342 erase->len = part->block_size;
343 erase->priv = (u_long)part;
344
345 part->blocks[block].state = BLOCK_ERASING;
346 part->blocks[block].free_sectors = 0;
347
348 rc = part->mbd.mtd->erase(part->mbd.mtd, erase);
349
350 if (rc) {
351 printk(KERN_WARNING PREFIX "erase of region %x,%x on '%s' "
352 "failed\n", erase->addr, erase->len,
353 part->mbd.mtd->name);
354 kfree(erase);
355 }
356
357 err:
358 return rc;
359 }
360
361 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
362 {
363 void *sector_data;
364 u16 *map;
365 size_t retlen;
366 int i, rc = -ENOMEM;
367
368 part->is_reclaiming = 1;
369
370 sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
371 if (!sector_data)
372 goto err3;
373
374 map = kmalloc(part->header_size, GFP_KERNEL);
375 if (!map)
376 goto err2;
377
378 rc = part->mbd.mtd->read(part->mbd.mtd,
379 part->blocks[block_no].offset, part->header_size,
380 &retlen, (u_char*)map);
381
382 if (!rc && retlen != part->header_size)
383 rc = -EIO;
384
385 if (rc) {
386 printk(KERN_NOTICE PREFIX "error reading '%s' at "
387 "0x%lx\n", part->mbd.mtd->name,
388 part->blocks[block_no].offset);
389
390 goto err;
391 }
392
393 for (i=0; i<part->data_sectors_per_block; i++) {
394 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
395 u_long addr;
396
397
398 if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
399 continue;
400
401 if (entry == SECTOR_ZERO)
402 entry = 0;
403
404 /* already warned about and ignored in build_block_map() */
405 if (entry >= part->sector_count)
406 continue;
407
408 addr = part->blocks[block_no].offset +
409 (i + part->header_sectors_per_block) * SECTOR_SIZE;
410
411 if (*old_sector == addr) {
412 *old_sector = -1;
413 if (!part->blocks[block_no].used_sectors--) {
414 rc = erase_block(part, block_no);
415 break;
416 }
417 continue;
418 }
419 rc = part->mbd.mtd->read(part->mbd.mtd, addr,
420 SECTOR_SIZE, &retlen, sector_data);
421
422 if (!rc && retlen != SECTOR_SIZE)
423 rc = -EIO;
424
425 if (rc) {
426 printk(KERN_NOTICE PREFIX "'%s': Unable to "
427 "read sector for relocation\n",
428 part->mbd.mtd->name);
429
430 goto err;
431 }
432
433 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
434 entry, sector_data);
435
436 if (rc)
437 goto err;
438 }
439
440 err:
441 kfree(map);
442 err2:
443 kfree(sector_data);
444 err3:
445 part->is_reclaiming = 0;
446
447 return rc;
448 }
449
450 static int reclaim_block(struct partition *part, u_long *old_sector)
451 {
452 int block, best_block, score, old_sector_block;
453 int rc;
454
455 /* we have a race if sync doesn't exist */
456 if (part->mbd.mtd->sync)
457 part->mbd.mtd->sync(part->mbd.mtd);
458
459 score = 0x7fffffff; /* MAX_INT */
460 best_block = -1;
461 if (*old_sector != -1)
462 old_sector_block = *old_sector / part->block_size;
463 else
464 old_sector_block = -1;
465
466 for (block=0; block<part->total_blocks; block++) {
467 int this_score;
468
469 if (block == part->reserved_block)
470 continue;
471
472 /*
473 * Postpone reclaiming if there is a free sector as
474 * more removed sectors is more efficient (have to move
475 * less).
476 */
477 if (part->blocks[block].free_sectors)
478 return 0;
479
480 this_score = part->blocks[block].used_sectors;
481
482 if (block == old_sector_block)
483 this_score--;
484 else {
485 /* no point in moving a full block */
486 if (part->blocks[block].used_sectors ==
487 part->data_sectors_per_block)
488 continue;
489 }
490
491 this_score += part->blocks[block].erases;
492
493 if (this_score < score) {
494 best_block = block;
495 score = this_score;
496 }
497 }
498
499 if (best_block == -1)
500 return -ENOSPC;
501
502 part->current_block = -1;
503 part->reserved_block = best_block;
504
505 pr_debug("reclaim_block: reclaiming block #%d with %d used "
506 "%d free sectors\n", best_block,
507 part->blocks[best_block].used_sectors,
508 part->blocks[best_block].free_sectors);
509
510 if (part->blocks[best_block].used_sectors)
511 rc = move_block_contents(part, best_block, old_sector);
512 else
513 rc = erase_block(part, best_block);
514
515 return rc;
516 }
517
518 /*
519 * IMPROVE: It would be best to choose the block with the most deleted sectors,
520 * because if we fill that one up first it'll have the most chance of having
521 * the least live sectors at reclaim.
522 */
523 static int find_free_block(const struct partition *part)
524 {
525 int block, stop;
526
527 block = part->current_block == -1 ?
528 jiffies % part->total_blocks : part->current_block;
529 stop = block;
530
531 do {
532 if (part->blocks[block].free_sectors &&
533 block != part->reserved_block)
534 return block;
535
536 if (++block >= part->total_blocks)
537 block = 0;
538
539 } while (block != stop);
540
541 return -1;
542 }
543
544 static int find_writeable_block(struct partition *part, u_long *old_sector)
545 {
546 int rc, block;
547 size_t retlen;
548
549 block = find_free_block(part);
550
551 if (block == -1) {
552 if (!part->is_reclaiming) {
553 rc = reclaim_block(part, old_sector);
554 if (rc)
555 goto err;
556
557 block = find_free_block(part);
558 }
559
560 if (block == -1) {
561 rc = -ENOSPC;
562 goto err;
563 }
564 }
565
566 rc = part->mbd.mtd->read(part->mbd.mtd, part->blocks[block].offset,
567 part->header_size, &retlen, (u_char*)part->header_cache);
568
569 if (!rc && retlen != part->header_size)
570 rc = -EIO;
571
572 if (rc) {
573 printk(KERN_NOTICE PREFIX "'%s': unable to read header at "
574 "0x%lx\n", part->mbd.mtd->name,
575 part->blocks[block].offset);
576 goto err;
577 }
578
579 part->current_block = block;
580
581 err:
582 return rc;
583 }
584
585 static int mark_sector_deleted(struct partition *part, u_long old_addr)
586 {
587 int block, offset, rc;
588 u_long addr;
589 size_t retlen;
590 u16 del = const_cpu_to_le16(SECTOR_DELETED);
591
592 block = old_addr / part->block_size;
593 offset = (old_addr % part->block_size) / SECTOR_SIZE -
594 part->header_sectors_per_block;
595
596 addr = part->blocks[block].offset +
597 (HEADER_MAP_OFFSET + offset) * sizeof(u16);
598 rc = part->mbd.mtd->write(part->mbd.mtd, addr,
599 sizeof(del), &retlen, (u_char*)&del);
600
601 if (!rc && retlen != sizeof(del))
602 rc = -EIO;
603
604 if (rc) {
605 printk(KERN_WARNING PREFIX "error writing '%s' at "
606 "0x%lx\n", part->mbd.mtd->name, addr);
607 if (rc)
608 goto err;
609 }
610 if (block == part->current_block)
611 part->header_cache[offset + HEADER_MAP_OFFSET] = del;
612
613 part->blocks[block].used_sectors--;
614
615 if (!part->blocks[block].used_sectors &&
616 !part->blocks[block].free_sectors)
617 rc = erase_block(part, block);
618
619 err:
620 return rc;
621 }
622
623 static int find_free_sector(const struct partition *part, const struct block *block)
624 {
625 int i, stop;
626
627 i = stop = part->data_sectors_per_block - block->free_sectors;
628
629 do {
630 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i])
631 == SECTOR_FREE)
632 return i;
633
634 if (++i == part->data_sectors_per_block)
635 i = 0;
636 }
637 while(i != stop);
638
639 return -1;
640 }
641
642 static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr)
643 {
644 struct partition *part = (struct partition*)dev;
645 struct block *block;
646 u_long addr;
647 int i;
648 int rc;
649 size_t retlen;
650 u16 entry;
651
652 if (part->current_block == -1 ||
653 !part->blocks[part->current_block].free_sectors) {
654
655 rc = find_writeable_block(part, old_addr);
656 if (rc)
657 goto err;
658 }
659
660 block = &part->blocks[part->current_block];
661
662 i = find_free_sector(part, block);
663
664 if (i < 0) {
665 rc = -ENOSPC;
666 goto err;
667 }
668
669 addr = (i + part->header_sectors_per_block) * SECTOR_SIZE +
670 block->offset;
671 rc = part->mbd.mtd->write(part->mbd.mtd,
672 addr, SECTOR_SIZE, &retlen, (u_char*)buf);
673
674 if (!rc && retlen != SECTOR_SIZE)
675 rc = -EIO;
676
677 if (rc) {
678 printk(KERN_WARNING PREFIX "error writing '%s' at 0x%lx\n",
679 part->mbd.mtd->name, addr);
680 if (rc)
681 goto err;
682 }
683
684 part->sector_map[sector] = addr;
685
686 entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector);
687
688 part->header_cache[i + HEADER_MAP_OFFSET] = entry;
689
690 addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16);
691 rc = part->mbd.mtd->write(part->mbd.mtd, addr,
692 sizeof(entry), &retlen, (u_char*)&entry);
693
694 if (!rc && retlen != sizeof(entry))
695 rc = -EIO;
696
697 if (rc) {
698 printk(KERN_WARNING PREFIX "error writing '%s' at 0x%lx\n",
699 part->mbd.mtd->name, addr);
700 if (rc)
701 goto err;
702 }
703 block->used_sectors++;
704 block->free_sectors--;
705
706 err:
707 return rc;
708 }
709
710 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
711 {
712 struct partition *part = (struct partition*)dev;
713 u_long old_addr;
714 int i;
715 int rc = 0;
716
717 pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector);
718
719 if (part->reserved_block == -1) {
720 rc = -EACCES;
721 goto err;
722 }
723
724 if (sector >= part->sector_count) {
725 rc = -EIO;
726 goto err;
727 }
728
729 old_addr = part->sector_map[sector];
730
731 for (i=0; i<SECTOR_SIZE; i++) {
732 if (!buf[i])
733 continue;
734
735 rc = do_writesect(dev, sector, buf, &old_addr);
736 if (rc)
737 goto err;
738 break;
739 }
740
741 if (i == SECTOR_SIZE)
742 part->sector_map[sector] = -1;
743
744 if (old_addr != -1)
745 rc = mark_sector_deleted(part, old_addr);
746
747 err:
748 return rc;
749 }
750
751 static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
752 {
753 struct partition *part = (struct partition*)dev;
754
755 geo->heads = 1;
756 geo->sectors = SECTORS_PER_TRACK;
757 geo->cylinders = part->cylinders;
758
759 return 0;
760 }
761
762 static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
763 {
764 struct partition *part;
765
766 if (mtd->type != MTD_NORFLASH)
767 return;
768
769 part = kcalloc(1, sizeof(struct partition), GFP_KERNEL);
770 if (!part)
771 return;
772
773 part->mbd.mtd = mtd;
774
775 if (block_size)
776 part->block_size = block_size;
777 else {
778 if (!mtd->erasesize) {
779 printk(KERN_NOTICE PREFIX "please provide block_size");
780 return;
781 }
782 else
783 part->block_size = mtd->erasesize;
784 }
785
786 if (scan_header(part) == 0) {
787 part->mbd.size = part->sector_count;
788 part->mbd.blksize = SECTOR_SIZE;
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_NOTICE PREFIX "'%s': errors found, "
795 "setting read-only", 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
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 struct mtd_blktrans_ops rfd_ftl_tr = {
827 .name = "rfd",
828 .major = RFD_FTL_MAJOR,
829 .part_bits = PART_BITS,
830 .readsect = rfd_ftl_readsect,
831 .writesect = rfd_ftl_writesect,
832 .getgeo = rfd_ftl_getgeo,
833 .add_mtd = rfd_ftl_add_mtd,
834 .remove_dev = rfd_ftl_remove_dev,
835 .owner = THIS_MODULE,
836 };
837
838 static int __init init_rfd_ftl(void)
839 {
840 return register_mtd_blktrans(&rfd_ftl_tr);
841 }
842
843 static void __exit cleanup_rfd_ftl(void)
844 {
845 deregister_mtd_blktrans(&rfd_ftl_tr);
846 }
847
848 module_init(init_rfd_ftl);
849 module_exit(cleanup_rfd_ftl);
850
851 MODULE_LICENSE("GPL");
852 MODULE_AUTHOR("Sean Young <sean@mess.org>");
853 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
854 "used by General Software's Embedded BIOS");
855
Linux with added FPC-III support