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mach-ux500: enable ARM errata 764369
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mtd / rfd_ftl.c
blob73ae217a4252a1b386c7c9b3b820dece4c3e65bd
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 #include <linux/module.h>
22
23 #include <asm/types.h>
24
25 static int block_size = 0;
26 module_param(block_size, int, 0);
27 MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");
28
29 #define PREFIX "rfd_ftl: "
30
31 /* This major has been assigned by device@lanana.org */
32 #ifndef RFD_FTL_MAJOR
33 #define RFD_FTL_MAJOR 256
34 #endif
35
36 /* Maximum number of partitions in an FTL region */
37 #define PART_BITS 4
38
39 /* An erase unit should start with this value */
40 #define RFD_MAGIC 0x9193
41
42 /* the second value is 0xffff or 0xffc8; function unknown */
43
44 /* the third value is always 0xffff, ignored */
45
46 /* next is an array of mapping for each corresponding sector */
47 #define HEADER_MAP_OFFSET 3
48 #define SECTOR_DELETED 0x0000
49 #define SECTOR_ZERO 0xfffe
50 #define SECTOR_FREE 0xffff
51
52 #define SECTOR_SIZE 512
53
54 #define SECTORS_PER_TRACK 63
55
56 struct block {
57 enum {
58 BLOCK_OK,
59 BLOCK_ERASING,
60 BLOCK_ERASED,
61 BLOCK_UNUSED,
62 BLOCK_FAILED
63 } state;
64 int free_sectors;
65 int used_sectors;
66 int erases;
67 u_long offset;
68 };
69
70 struct partition {
71 struct mtd_blktrans_dev mbd;
72
73 u_int block_size; /* size of erase unit */
74 u_int total_blocks; /* number of erase units */
75 u_int header_sectors_per_block; /* header sectors in erase unit */
76 u_int data_sectors_per_block; /* data sectors in erase unit */
77 u_int sector_count; /* sectors in translated disk */
78 u_int header_size; /* bytes in header sector */
79 int reserved_block; /* block next up for reclaim */
80 int current_block; /* block to write to */
81 u16 *header_cache; /* cached header */
82
83 int is_reclaiming;
84 int cylinders;
85 int errors;
86 u_long *sector_map;
87 struct block *blocks;
88 };
89
90 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf);
91
92 static int build_block_map(struct partition *part, int block_no)
93 {
94 struct block *block = &part->blocks[block_no];
95 int i;
96
97 block->offset = part->block_size * block_no;
98
99 if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) {
100 block->state = BLOCK_UNUSED;
101 return -ENOENT;
102 }
103
104 block->state = BLOCK_OK;
105
106 for (i=0; i<part->data_sectors_per_block; i++) {
107 u16 entry;
108
109 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
110
111 if (entry == SECTOR_DELETED)
112 continue;
113
114 if (entry == SECTOR_FREE) {
115 block->free_sectors++;
116 continue;
117 }
118
119 if (entry == SECTOR_ZERO)
120 entry = 0;
121
122 if (entry >= part->sector_count) {
123 printk(KERN_WARNING PREFIX
124 "'%s': unit #%d: entry %d corrupt, "
125 "sector %d out of range\n",
126 part->mbd.mtd->name, block_no, i, entry);
127 continue;
128 }
129
130 if (part->sector_map[entry] != -1) {
131 printk(KERN_WARNING PREFIX
132 "'%s': more than one entry for sector %d\n",
133 part->mbd.mtd->name, entry);
134 part->errors = 1;
135 continue;
136 }
137
138 part->sector_map[entry] = block->offset +
139 (i + part->header_sectors_per_block) * SECTOR_SIZE;
140
141 block->used_sectors++;
142 }
143
144 if (block->free_sectors == part->data_sectors_per_block)
145 part->reserved_block = block_no;
146
147 return 0;
148 }
149
150 static int scan_header(struct partition *part)
151 {
152 int sectors_per_block;
153 int i, rc = -ENOMEM;
154 int blocks_found;
155 size_t retlen;
156
157 sectors_per_block = part->block_size / SECTOR_SIZE;
158 part->total_blocks = (u32)part->mbd.mtd->size / part->block_size;
159
160 if (part->total_blocks < 2)
161 return -ENOENT;
162
163 /* each erase block has three bytes header, followed by the map */
164 part->header_sectors_per_block =
165 ((HEADER_MAP_OFFSET + sectors_per_block) *
166 sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
167
168 part->data_sectors_per_block = sectors_per_block -
169 part->header_sectors_per_block;
170
171 part->header_size = (HEADER_MAP_OFFSET +
172 part->data_sectors_per_block) * sizeof(u16);
173
174 part->cylinders = (part->data_sectors_per_block *
175 (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
176
177 part->sector_count = part->cylinders * SECTORS_PER_TRACK;
178
179 part->current_block = -1;
180 part->reserved_block = -1;
181 part->is_reclaiming = 0;
182
183 part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
184 if (!part->header_cache)
185 goto err;
186
187 part->blocks = kcalloc(part->total_blocks, sizeof(struct block),
188 GFP_KERNEL);
189 if (!part->blocks)
190 goto err;
191
192 part->sector_map = vmalloc(part->sector_count * sizeof(u_long));
193 if (!part->sector_map) {
194 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for "
195 "sector map", part->mbd.mtd->name);
196 goto err;
197 }
198
199 for (i=0; i<part->sector_count; i++)
200 part->sector_map[i] = -1;
201
202 for (i=0, blocks_found=0; i<part->total_blocks; i++) {
203 rc = part->mbd.mtd->read(part->mbd.mtd,
204 i * part->block_size, part->header_size,
205 &retlen, (u_char*)part->header_cache);
206
207 if (!rc && retlen != part->header_size)
208 rc = -EIO;
209
210 if (rc)
211 goto err;
212
213 if (!build_block_map(part, i))
214 blocks_found++;
215 }
216
217 if (blocks_found == 0) {
218 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
219 part->mbd.mtd->name);
220 rc = -ENOENT;
221 goto err;
222 }
223
224 if (part->reserved_block == -1) {
225 printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n",
226 part->mbd.mtd->name);
227
228 part->errors = 1;
229 }
230
231 return 0;
232
233 err:
234 vfree(part->sector_map);
235 kfree(part->header_cache);
236 kfree(part->blocks);
237
238 return rc;
239 }
240
241 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
242 {
243 struct partition *part = (struct partition*)dev;
244 u_long addr;
245 size_t retlen;
246 int rc;
247
248 if (sector >= part->sector_count)
249 return -EIO;
250
251 addr = part->sector_map[sector];
252 if (addr != -1) {
253 rc = part->mbd.mtd->read(part->mbd.mtd, addr, SECTOR_SIZE,
254 &retlen, (u_char*)buf);
255 if (!rc && retlen != SECTOR_SIZE)
256 rc = -EIO;
257
258 if (rc) {
259 printk(KERN_WARNING PREFIX "error reading '%s' at "
260 "0x%lx\n", part->mbd.mtd->name, addr);
261 return rc;
262 }
263 } else
264 memset(buf, 0, SECTOR_SIZE);
265
266 return 0;
267 }
268
269 static void erase_callback(struct erase_info *erase)
270 {
271 struct partition *part;
272 u16 magic;
273 int i, rc;
274 size_t retlen;
275
276 part = (struct partition*)erase->priv;
277
278 i = (u32)erase->addr / part->block_size;
279 if (i >= part->total_blocks || part->blocks[i].offset != erase->addr ||
280 erase->addr > UINT_MAX) {
281 printk(KERN_ERR PREFIX "erase callback for unknown offset %llx "
282 "on '%s'\n", (unsigned long long)erase->addr, part->mbd.mtd->name);
283 return;
284 }
285
286 if (erase->state != MTD_ERASE_DONE) {
287 printk(KERN_WARNING PREFIX "erase failed at 0x%llx on '%s', "
288 "state %d\n", (unsigned long long)erase->addr,
289 part->mbd.mtd->name, erase->state);
290
291 part->blocks[i].state = BLOCK_FAILED;
292 part->blocks[i].free_sectors = 0;
293 part->blocks[i].used_sectors = 0;
294
295 kfree(erase);
296
297 return;
298 }
299
300 magic = cpu_to_le16(RFD_MAGIC);
301
302 part->blocks[i].state = BLOCK_ERASED;
303 part->blocks[i].free_sectors = part->data_sectors_per_block;
304 part->blocks[i].used_sectors = 0;
305 part->blocks[i].erases++;
306
307 rc = part->mbd.mtd->write(part->mbd.mtd,
308 part->blocks[i].offset, sizeof(magic), &retlen,
309 (u_char*)&magic);
310
311 if (!rc && retlen != sizeof(magic))
312 rc = -EIO;
313
314 if (rc) {
315 printk(KERN_ERR PREFIX "'%s': unable to write RFD "
316 "header at 0x%lx\n",
317 part->mbd.mtd->name,
318 part->blocks[i].offset);
319 part->blocks[i].state = BLOCK_FAILED;
320 }
321 else
322 part->blocks[i].state = BLOCK_OK;
323
324 kfree(erase);
325 }
326
327 static int erase_block(struct partition *part, int block)
328 {
329 struct erase_info *erase;
330 int rc = -ENOMEM;
331
332 erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
333 if (!erase)
334 goto err;
335
336 erase->mtd = part->mbd.mtd;
337 erase->callback = erase_callback;
338 erase->addr = part->blocks[block].offset;
339 erase->len = part->block_size;
340 erase->priv = (u_long)part;
341
342 part->blocks[block].state = BLOCK_ERASING;
343 part->blocks[block].free_sectors = 0;
344
345 rc = part->mbd.mtd->erase(part->mbd.mtd, erase);
346
347 if (rc) {
348 printk(KERN_ERR PREFIX "erase of region %llx,%llx on '%s' "
349 "failed\n", (unsigned long long)erase->addr,
350 (unsigned long long)erase->len, part->mbd.mtd->name);
351 kfree(erase);
352 }
353
354 err:
355 return rc;
356 }
357
358 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
359 {
360 void *sector_data;
361 u16 *map;
362 size_t retlen;
363 int i, rc = -ENOMEM;
364
365 part->is_reclaiming = 1;
366
367 sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
368 if (!sector_data)
369 goto err3;
370
371 map = kmalloc(part->header_size, GFP_KERNEL);
372 if (!map)
373 goto err2;
374
375 rc = part->mbd.mtd->read(part->mbd.mtd,
376 part->blocks[block_no].offset, part->header_size,
377 &retlen, (u_char*)map);
378
379 if (!rc && retlen != part->header_size)
380 rc = -EIO;
381
382 if (rc) {
383 printk(KERN_ERR PREFIX "error reading '%s' at "
384 "0x%lx\n", part->mbd.mtd->name,
385 part->blocks[block_no].offset);
386
387 goto err;
388 }
389
390 for (i=0; i<part->data_sectors_per_block; i++) {
391 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
392 u_long addr;
393
394
395 if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
396 continue;
397
398 if (entry == SECTOR_ZERO)
399 entry = 0;
400
401 /* already warned about and ignored in build_block_map() */
402 if (entry >= part->sector_count)
403 continue;
404
405 addr = part->blocks[block_no].offset +
406 (i + part->header_sectors_per_block) * SECTOR_SIZE;
407
408 if (*old_sector == addr) {
409 *old_sector = -1;
410 if (!part->blocks[block_no].used_sectors--) {
411 rc = erase_block(part, block_no);
412 break;
413 }
414 continue;
415 }
416 rc = part->mbd.mtd->read(part->mbd.mtd, addr,
417 SECTOR_SIZE, &retlen, sector_data);
418
419 if (!rc && retlen != SECTOR_SIZE)
420 rc = -EIO;
421
422 if (rc) {
423 printk(KERN_ERR PREFIX "'%s': Unable to "
424 "read sector for relocation\n",
425 part->mbd.mtd->name);
426
427 goto err;
428 }
429
430 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
431 entry, sector_data);
432
433 if (rc)
434 goto err;
435 }
436
437 err:
438 kfree(map);
439 err2:
440 kfree(sector_data);
441 err3:
442 part->is_reclaiming = 0;
443
444 return rc;
445 }
446
447 static int reclaim_block(struct partition *part, u_long *old_sector)
448 {
449 int block, best_block, score, old_sector_block;
450 int rc;
451
452 /* we have a race if sync doesn't exist */
453 if (part->mbd.mtd->sync)
454 part->mbd.mtd->sync(part->mbd.mtd);
455
456 score = 0x7fffffff; /* MAX_INT */
457 best_block = -1;
458 if (*old_sector != -1)
459 old_sector_block = *old_sector / part->block_size;
460 else
461 old_sector_block = -1;
462
463 for (block=0; block<part->total_blocks; block++) {
464 int this_score;
465
466 if (block == part->reserved_block)
467 continue;
468
469 /*
470 * Postpone reclaiming if there is a free sector as
471 * more removed sectors is more efficient (have to move
472 * less).
473 */
474 if (part->blocks[block].free_sectors)
475 return 0;
476
477 this_score = part->blocks[block].used_sectors;
478
479 if (block == old_sector_block)
480 this_score--;
481 else {
482 /* no point in moving a full block */
483 if (part->blocks[block].used_sectors ==
484 part->data_sectors_per_block)
485 continue;
486 }
487
488 this_score += part->blocks[block].erases;
489
490 if (this_score < score) {
491 best_block = block;
492 score = this_score;
493 }
494 }
495
496 if (best_block == -1)
497 return -ENOSPC;
498
499 part->current_block = -1;
500 part->reserved_block = best_block;
501
502 pr_debug("reclaim_block: reclaiming block #%d with %d used "
503 "%d free sectors\n", best_block,
504 part->blocks[best_block].used_sectors,
505 part->blocks[best_block].free_sectors);
506
507 if (part->blocks[best_block].used_sectors)
508 rc = move_block_contents(part, best_block, old_sector);
509 else
510 rc = erase_block(part, best_block);
511
512 return rc;
513 }
514
515 /*
516 * IMPROVE: It would be best to choose the block with the most deleted sectors,
517 * because if we fill that one up first it'll have the most chance of having
518 * the least live sectors at reclaim.
519 */
520 static int find_free_block(struct partition *part)
521 {
522 int block, stop;
523
524 block = part->current_block == -1 ?
525 jiffies % part->total_blocks : part->current_block;
526 stop = block;
527
528 do {
529 if (part->blocks[block].free_sectors &&
530 block != part->reserved_block)
531 return block;
532
533 if (part->blocks[block].state == BLOCK_UNUSED)
534 erase_block(part, 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_writable_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_ERR 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 = 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_ERR 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_writable_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_ERR 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_ERR 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 || mtd->size > UINT_MAX)
767 return;
768
769 part = kzalloc(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_WARNING PREFIX "please provide block_size");
780 goto out;
781 } else
782 part->block_size = mtd->erasesize;
783 }
784
785 if (scan_header(part) == 0) {
786 part->mbd.size = part->sector_count;
787 part->mbd.tr = tr;
788 part->mbd.devnum = -1;
789 if (!(mtd->flags & MTD_WRITEABLE))
790 part->mbd.readonly = 1;
791 else if (part->errors) {
792 printk(KERN_WARNING PREFIX "'%s': errors found, "
793 "setting read-only\n", mtd->name);
794 part->mbd.readonly = 1;
795 }
796
797 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
798 mtd->name, mtd->type, mtd->flags);
799
800 if (!add_mtd_blktrans_dev((void*)part))
801 return;
802 }
803 out:
804 kfree(part);
805 }
806
807 static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
808 {
809 struct partition *part = (struct partition*)dev;
810 int i;
811
812 for (i=0; i<part->total_blocks; i++) {
813 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n",
814 part->mbd.mtd->name, i, part->blocks[i].erases);
815 }
816
817 del_mtd_blktrans_dev(dev);
818 vfree(part->sector_map);
819 kfree(part->header_cache);
820 kfree(part->blocks);
821 }
822
823 static struct mtd_blktrans_ops rfd_ftl_tr = {
824 .name = "rfd",
825 .major = RFD_FTL_MAJOR,
826 .part_bits = PART_BITS,
827 .blksize = SECTOR_SIZE,
828
829 .readsect = rfd_ftl_readsect,
830 .writesect = rfd_ftl_writesect,
831 .getgeo = rfd_ftl_getgeo,
832 .add_mtd = rfd_ftl_add_mtd,
833 .remove_dev = rfd_ftl_remove_dev,
834 .owner = THIS_MODULE,
835 };
836
837 static int __init init_rfd_ftl(void)
838 {
839 return register_mtd_blktrans(&rfd_ftl_tr);
840 }
841
842 static void __exit cleanup_rfd_ftl(void)
843 {
844 deregister_mtd_blktrans(&rfd_ftl_tr);
845 }
846
847 module_init(init_rfd_ftl);
848 module_exit(cleanup_rfd_ftl);
849
850 MODULE_LICENSE("GPL");
851 MODULE_AUTHOR("Sean Young <sean@mess.org>");
852 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
853 "used by General Software's Embedded BIOS");
854
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree