Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial
[linux-2.6] / drivers / mtd / rfd_ftl.c
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/jiffies.h>
22
23 #include <asm/types.h>
24
25 #define const_cpu_to_le16       __constant_cpu_to_le16
26
27 static int block_size = 0;
28 module_param(block_size, int, 0);
29 MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");
30
31 #define PREFIX "rfd_ftl: "
32
33 /* Major device # for FTL device */
34
35 /* A request for this major has been sent to device@lanana.org */
36 #ifndef RFD_FTL_MAJOR
37 #define RFD_FTL_MAJOR           95
38 #endif
39
40 /* Maximum number of partitions in an FTL region */
41 #define PART_BITS               4
42
43 /* An erase unit should start with this value */
44 #define RFD_MAGIC               0x9193
45
46 /* the second value is 0xffff or 0xffc8; function unknown */
47
48 /* the third value is always 0xffff, ignored */
49
50 /* next is an array of mapping for each corresponding sector */
51 #define HEADER_MAP_OFFSET       3
52 #define SECTOR_DELETED          0x0000
53 #define SECTOR_ZERO             0xfffe
54 #define SECTOR_FREE             0xffff
55
56 #define SECTOR_SIZE             512
57
58 #define SECTORS_PER_TRACK       63
59
60 struct block {
61         enum {
62                 BLOCK_OK,
63                 BLOCK_ERASING,
64                 BLOCK_ERASED,
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_ERASED; /* assumption */
104                 block->free_sectors = part->data_sectors_per_block;
105                 part->reserved_block = block_no;
106                 return 1;
107         }
108
109         block->state = BLOCK_OK;
110
111         for (i=0; i<part->data_sectors_per_block; i++) {
112                 u16 entry;
113
114                 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
115
116                 if (entry == SECTOR_DELETED)
117                         continue;
118
119                 if (entry == SECTOR_FREE) {
120                         block->free_sectors++;
121                         continue;
122                 }
123
124                 if (entry == SECTOR_ZERO)
125                         entry = 0;
126
127                 if (entry >= part->sector_count) {
128                         printk(KERN_NOTICE PREFIX
129                                 "'%s': unit #%d: entry %d corrupt, "
130                                 "sector %d out of range\n",
131                                 part->mbd.mtd->name, block_no, i, entry);
132                         continue;
133                 }
134
135                 if (part->sector_map[entry] != -1) {
136                         printk(KERN_NOTICE PREFIX
137                                 "'%s': more than one entry for sector %d\n",
138                                 part->mbd.mtd->name, entry);
139                         part->errors = 1;
140                         continue;
141                 }
142
143                 part->sector_map[entry] = block->offset +
144                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
145
146                 block->used_sectors++;
147         }
148
149         if (block->free_sectors == part->data_sectors_per_block)
150                 part->reserved_block = block_no;
151
152         return 0;
153 }
154
155 static int scan_header(struct partition *part)
156 {
157         int sectors_per_block;
158         int i, rc = -ENOMEM;
159         int blocks_found;
160         size_t retlen;
161
162         sectors_per_block = part->block_size / SECTOR_SIZE;
163         part->total_blocks = part->mbd.mtd->size / part->block_size;
164
165         if (part->total_blocks < 2)
166                 return -ENOENT;
167
168         /* each erase block has three bytes header, followed by the map */
169         part->header_sectors_per_block =
170                         ((HEADER_MAP_OFFSET + sectors_per_block) *
171                         sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
172
173         part->data_sectors_per_block = sectors_per_block -
174                         part->header_sectors_per_block;
175
176         part->header_size = (HEADER_MAP_OFFSET +
177                         part->data_sectors_per_block) * sizeof(u16);
178
179         part->cylinders = (part->data_sectors_per_block *
180                         (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
181
182         part->sector_count = part->cylinders * SECTORS_PER_TRACK;
183
184         part->current_block = -1;
185         part->reserved_block = -1;
186         part->is_reclaiming = 0;
187
188         part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
189         if (!part->header_cache)
190                 goto err;
191
192         part->blocks = kcalloc(part->total_blocks, sizeof(struct block),
193                         GFP_KERNEL);
194         if (!part->blocks)
195                 goto err;
196
197         part->sector_map = vmalloc(part->sector_count * sizeof(u_long));
198         if (!part->sector_map) {
199                 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for "
200                         "sector map", part->mbd.mtd->name);
201                 goto err;
202         }
203
204         for (i=0; i<part->sector_count; i++)
205                 part->sector_map[i] = -1;
206
207         for (i=0, blocks_found=0; i<part->total_blocks; i++) {
208                 rc = part->mbd.mtd->read(part->mbd.mtd,
209                                 i * part->block_size, part->header_size,
210                                 &retlen, (u_char*)part->header_cache);
211
212                 if (!rc && retlen != part->header_size)
213                         rc = -EIO;
214
215                 if (rc)
216                         goto err;
217
218                 if (!build_block_map(part, i))
219                         blocks_found++;
220         }
221
222         if (blocks_found == 0) {
223                 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
224                                 part->mbd.mtd->name);
225                 rc = -ENOENT;
226                 goto err;
227         }
228
229         if (part->reserved_block == -1) {
230                 printk(KERN_NOTICE PREFIX "'%s': no empty erase unit found\n",
231                                 part->mbd.mtd->name);
232
233                 part->errors = 1;
234         }
235
236         return 0;
237
238 err:
239         vfree(part->sector_map);
240         kfree(part->header_cache);
241         kfree(part->blocks);
242
243         return rc;
244 }
245
246 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
247 {
248         struct partition *part = (struct partition*)dev;
249         u_long addr;
250         size_t retlen;
251         int rc;
252
253         if (sector >= part->sector_count)
254                 return -EIO;
255
256         addr = part->sector_map[sector];
257         if (addr != -1) {
258                 rc = part->mbd.mtd->read(part->mbd.mtd, addr, SECTOR_SIZE,
259                                                 &retlen, (u_char*)buf);
260                 if (!rc && retlen != SECTOR_SIZE)
261                         rc = -EIO;
262
263                 if (rc) {
264                         printk(KERN_WARNING PREFIX "error reading '%s' at "
265                                 "0x%lx\n", part->mbd.mtd->name, addr);
266                         return rc;
267                 }
268         } else
269                 memset(buf, 0, SECTOR_SIZE);
270
271         return 0;
272 }
273
274 static void erase_callback(struct erase_info *erase)
275 {
276         struct partition *part;
277         u16 magic;
278         int i, rc;
279         size_t retlen;
280
281         part = (struct partition*)erase->priv;
282
283         i = erase->addr / part->block_size;
284         if (i >= part->total_blocks || part->blocks[i].offset != erase->addr) {
285                 printk(KERN_ERR PREFIX "erase callback for unknown offset %x "
286                                 "on '%s'\n", erase->addr, part->mbd.mtd->name);
287                 return;
288         }
289
290         if (erase->state != MTD_ERASE_DONE) {
291                 printk(KERN_WARNING PREFIX "erase failed at 0x%x on '%s', "
292                                 "state %d\n", erase->addr,
293                                 part->mbd.mtd->name, erase->state);
294
295                 part->blocks[i].state = BLOCK_FAILED;
296                 part->blocks[i].free_sectors = 0;
297                 part->blocks[i].used_sectors = 0;
298
299                 kfree(erase);
300
301                 return;
302         }
303
304         magic = const_cpu_to_le16(RFD_MAGIC);
305
306         part->blocks[i].state = BLOCK_ERASED;
307         part->blocks[i].free_sectors = part->data_sectors_per_block;
308         part->blocks[i].used_sectors = 0;
309         part->blocks[i].erases++;
310
311         rc = part->mbd.mtd->write(part->mbd.mtd,
312                 part->blocks[i].offset, sizeof(magic), &retlen,
313                 (u_char*)&magic);
314
315         if (!rc && retlen != sizeof(magic))
316                 rc = -EIO;
317
318         if (rc) {
319                 printk(KERN_NOTICE PREFIX "'%s': unable to write RFD "
320                                 "header at 0x%lx\n",
321                                 part->mbd.mtd->name,
322                                 part->blocks[i].offset);
323                 part->blocks[i].state = BLOCK_FAILED;
324         }
325         else
326                 part->blocks[i].state = BLOCK_OK;
327
328         kfree(erase);
329 }
330
331 static int erase_block(struct partition *part, int block)
332 {
333         struct erase_info *erase;
334         int rc = -ENOMEM;
335
336         erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
337         if (!erase)
338                 goto err;
339
340         erase->mtd = part->mbd.mtd;
341         erase->callback = erase_callback;
342         erase->addr = part->blocks[block].offset;
343         erase->len = part->block_size;
344         erase->priv = (u_long)part;
345
346         part->blocks[block].state = BLOCK_ERASING;
347         part->blocks[block].free_sectors = 0;
348
349         rc = part->mbd.mtd->erase(part->mbd.mtd, erase);
350
351         if (rc) {
352                 printk(KERN_WARNING PREFIX "erase of region %x,%x on '%s' "
353                                 "failed\n", erase->addr, erase->len,
354                                 part->mbd.mtd->name);
355                 kfree(erase);
356         }
357
358 err:
359         return rc;
360 }
361
362 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
363 {
364         void *sector_data;
365         u16 *map;
366         size_t retlen;
367         int i, rc = -ENOMEM;
368
369         part->is_reclaiming = 1;
370
371         sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
372         if (!sector_data)
373                 goto err3;
374
375         map = kmalloc(part->header_size, GFP_KERNEL);
376         if (!map)
377                 goto err2;
378
379         rc = part->mbd.mtd->read(part->mbd.mtd,
380                 part->blocks[block_no].offset, part->header_size,
381                 &retlen, (u_char*)map);
382
383         if (!rc && retlen != part->header_size)
384                 rc = -EIO;
385
386         if (rc) {
387                 printk(KERN_NOTICE PREFIX "error reading '%s' at "
388                         "0x%lx\n", part->mbd.mtd->name,
389                         part->blocks[block_no].offset);
390
391                 goto err;
392         }
393
394         for (i=0; i<part->data_sectors_per_block; i++) {
395                 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
396                 u_long addr;
397
398
399                 if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
400                         continue;
401
402                 if (entry == SECTOR_ZERO)
403                         entry = 0;
404
405                 /* already warned about and ignored in build_block_map() */
406                 if (entry >= part->sector_count)
407                         continue;
408
409                 addr = part->blocks[block_no].offset +
410                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
411
412                 if (*old_sector == addr) {
413                         *old_sector = -1;
414                         if (!part->blocks[block_no].used_sectors--) {
415                                 rc = erase_block(part, block_no);
416                                 break;
417                         }
418                         continue;
419                 }
420                 rc = part->mbd.mtd->read(part->mbd.mtd, addr,
421                         SECTOR_SIZE, &retlen, sector_data);
422
423                 if (!rc && retlen != SECTOR_SIZE)
424                         rc = -EIO;
425
426                 if (rc) {
427                         printk(KERN_NOTICE PREFIX "'%s': Unable to "
428                                 "read sector for relocation\n",
429                                 part->mbd.mtd->name);
430
431                         goto err;
432                 }
433
434                 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
435                                 entry, sector_data);
436
437                 if (rc)
438                         goto err;
439         }
440
441 err:
442         kfree(map);
443 err2:
444         kfree(sector_data);
445 err3:
446         part->is_reclaiming = 0;
447
448         return rc;
449 }
450
451 static int reclaim_block(struct partition *part, u_long *old_sector)
452 {
453         int block, best_block, score, old_sector_block;
454         int rc;
455
456         /* we have a race if sync doesn't exist */
457         if (part->mbd.mtd->sync)
458                 part->mbd.mtd->sync(part->mbd.mtd);
459
460         score = 0x7fffffff; /* MAX_INT */
461         best_block = -1;
462         if (*old_sector != -1)
463                 old_sector_block = *old_sector / part->block_size;
464         else
465                 old_sector_block = -1;
466
467         for (block=0; block<part->total_blocks; block++) {
468                 int this_score;
469
470                 if (block == part->reserved_block)
471                         continue;
472
473                 /*
474                  * Postpone reclaiming if there is a free sector as
475                  * more removed sectors is more efficient (have to move
476                  * less).
477                  */
478                 if (part->blocks[block].free_sectors)
479                         return 0;
480
481                 this_score = part->blocks[block].used_sectors;
482
483                 if (block == old_sector_block)
484                         this_score--;
485                 else {
486                         /* no point in moving a full block */
487                         if (part->blocks[block].used_sectors ==
488                                         part->data_sectors_per_block)
489                                 continue;
490                 }
491
492                 this_score += part->blocks[block].erases;
493
494                 if (this_score < score) {
495                         best_block = block;
496                         score = this_score;
497                 }
498         }
499
500         if (best_block == -1)
501                 return -ENOSPC;
502
503         part->current_block = -1;
504         part->reserved_block = best_block;
505
506         pr_debug("reclaim_block: reclaiming block #%d with %d used "
507                  "%d free sectors\n", best_block,
508                  part->blocks[best_block].used_sectors,
509                  part->blocks[best_block].free_sectors);
510
511         if (part->blocks[best_block].used_sectors)
512                 rc = move_block_contents(part, best_block, old_sector);
513         else
514                 rc = erase_block(part, best_block);
515
516         return rc;
517 }
518
519 /*
520  * IMPROVE: It would be best to choose the block with the most deleted sectors,
521  * because if we fill that one up first it'll have the most chance of having
522  * the least live sectors at reclaim.
523  */
524 static int find_free_block(const struct partition *part)
525 {
526         int block, stop;
527
528         block = part->current_block == -1 ?
529                         jiffies % part->total_blocks : part->current_block;
530         stop = block;
531
532         do {
533                 if (part->blocks[block].free_sectors &&
534                                 block != part->reserved_block)
535                         return block;
536
537                 if (++block >= part->total_blocks)
538                         block = 0;
539
540         } while (block != stop);
541
542         return -1;
543 }
544
545 static int find_writeable_block(struct partition *part, u_long *old_sector)
546 {
547         int rc, block;
548         size_t retlen;
549
550         block = find_free_block(part);
551
552         if (block == -1) {
553                 if (!part->is_reclaiming) {
554                         rc = reclaim_block(part, old_sector);
555                         if (rc)
556                                 goto err;
557
558                         block = find_free_block(part);
559                 }
560
561                 if (block == -1) {
562                         rc = -ENOSPC;
563                         goto err;
564                 }
565         }
566
567         rc = part->mbd.mtd->read(part->mbd.mtd, part->blocks[block].offset,
568                 part->header_size, &retlen, (u_char*)part->header_cache);
569
570         if (!rc && retlen != part->header_size)
571                 rc = -EIO;
572
573         if (rc) {
574                 printk(KERN_NOTICE PREFIX "'%s': unable to read header at "
575                                 "0x%lx\n", part->mbd.mtd->name,
576                                 part->blocks[block].offset);
577                 goto err;
578         }
579
580         part->current_block = block;
581
582 err:
583         return rc;
584 }
585
586 static int mark_sector_deleted(struct partition *part, u_long old_addr)
587 {
588         int block, offset, rc;
589         u_long addr;
590         size_t retlen;
591         u16 del = const_cpu_to_le16(SECTOR_DELETED);
592
593         block = old_addr / part->block_size;
594         offset = (old_addr % part->block_size) / SECTOR_SIZE -
595                 part->header_sectors_per_block;
596
597         addr = part->blocks[block].offset +
598                         (HEADER_MAP_OFFSET + offset) * sizeof(u16);
599         rc = part->mbd.mtd->write(part->mbd.mtd, addr,
600                 sizeof(del), &retlen, (u_char*)&del);
601
602         if (!rc && retlen != sizeof(del))
603                 rc = -EIO;
604
605         if (rc) {
606                 printk(KERN_WARNING PREFIX "error writing '%s' at "
607                         "0x%lx\n", part->mbd.mtd->name, addr);
608                 if (rc)
609                         goto err;
610         }
611         if (block == part->current_block)
612                 part->header_cache[offset + HEADER_MAP_OFFSET] = del;
613
614         part->blocks[block].used_sectors--;
615
616         if (!part->blocks[block].used_sectors &&
617             !part->blocks[block].free_sectors)
618                 rc = erase_block(part, block);
619
620 err:
621         return rc;
622 }
623
624 static int find_free_sector(const struct partition *part, const struct block *block)
625 {
626         int i, stop;
627
628         i = stop = part->data_sectors_per_block - block->free_sectors;
629
630         do {
631                 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i])
632                                 == SECTOR_FREE)
633                         return i;
634
635                 if (++i == part->data_sectors_per_block)
636                         i = 0;
637         }
638         while(i != stop);
639
640         return -1;
641 }
642
643 static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr)
644 {
645         struct partition *part = (struct partition*)dev;
646         struct block *block;
647         u_long addr;
648         int i;
649         int rc;
650         size_t retlen;
651         u16 entry;
652
653         if (part->current_block == -1 ||
654                 !part->blocks[part->current_block].free_sectors) {
655
656                 rc = find_writeable_block(part, old_addr);
657                 if (rc)
658                         goto err;
659         }
660
661         block = &part->blocks[part->current_block];
662
663         i = find_free_sector(part, block);
664
665         if (i < 0) {
666                 rc = -ENOSPC;
667                 goto err;
668         }
669
670         addr = (i + part->header_sectors_per_block) * SECTOR_SIZE +
671                 block->offset;
672         rc = part->mbd.mtd->write(part->mbd.mtd,
673                 addr, SECTOR_SIZE, &retlen, (u_char*)buf);
674
675         if (!rc && retlen != SECTOR_SIZE)
676                 rc = -EIO;
677
678         if (rc) {
679                 printk(KERN_WARNING PREFIX "error writing '%s' at 0x%lx\n",
680                                 part->mbd.mtd->name, addr);
681                 if (rc)
682                         goto err;
683         }
684
685         part->sector_map[sector] = addr;
686
687         entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector);
688
689         part->header_cache[i + HEADER_MAP_OFFSET] = entry;
690
691         addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16);
692         rc = part->mbd.mtd->write(part->mbd.mtd, addr,
693                         sizeof(entry), &retlen, (u_char*)&entry);
694
695         if (!rc && retlen != sizeof(entry))
696                 rc = -EIO;
697
698         if (rc) {
699                 printk(KERN_WARNING PREFIX "error writing '%s' at 0x%lx\n",
700                                 part->mbd.mtd->name, addr);
701                 if (rc)
702                         goto err;
703         }
704         block->used_sectors++;
705         block->free_sectors--;
706
707 err:
708         return rc;
709 }
710
711 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
712 {
713         struct partition *part = (struct partition*)dev;
714         u_long old_addr;
715         int i;
716         int rc = 0;
717
718         pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector);
719
720         if (part->reserved_block == -1) {
721                 rc = -EACCES;
722                 goto err;
723         }
724
725         if (sector >= part->sector_count) {
726                 rc = -EIO;
727                 goto err;
728         }
729
730         old_addr = part->sector_map[sector];
731
732         for (i=0; i<SECTOR_SIZE; i++) {
733                 if (!buf[i])
734                         continue;
735
736                 rc = do_writesect(dev, sector, buf, &old_addr);
737                 if (rc)
738                         goto err;
739                 break;
740         }
741
742         if (i == SECTOR_SIZE)
743                 part->sector_map[sector] = -1;
744
745         if (old_addr != -1)
746                 rc = mark_sector_deleted(part, old_addr);
747
748 err:
749         return rc;
750 }
751
752 static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
753 {
754         struct partition *part = (struct partition*)dev;
755
756         geo->heads = 1;
757         geo->sectors = SECTORS_PER_TRACK;
758         geo->cylinders = part->cylinders;
759
760         return 0;
761 }
762
763 static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
764 {
765         struct partition *part;
766
767         if (mtd->type != MTD_NORFLASH)
768                 return;
769
770         part = kcalloc(1, sizeof(struct partition), GFP_KERNEL);
771         if (!part)
772                 return;
773
774         part->mbd.mtd = mtd;
775
776         if (block_size)
777                 part->block_size = block_size;
778         else {
779                 if (!mtd->erasesize) {
780                         printk(KERN_NOTICE PREFIX "please provide block_size");
781                         return;
782                 }
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.blksize = SECTOR_SIZE;
790                 part->mbd.tr = tr;
791                 part->mbd.devnum = -1;
792                 if (!(mtd->flags & MTD_WRITEABLE))
793                         part->mbd.readonly = 1;
794                 else if (part->errors) {
795                         printk(KERN_NOTICE PREFIX "'%s': errors found, "
796                                         "setting read-only", mtd->name);
797                         part->mbd.readonly = 1;
798                 }
799
800                 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
801                                 mtd->name, mtd->type, mtd->flags);
802
803                 if (!add_mtd_blktrans_dev((void*)part))
804                         return;
805         }
806
807         kfree(part);
808 }
809
810 static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
811 {
812         struct partition *part = (struct partition*)dev;
813         int i;
814
815         for (i=0; i<part->total_blocks; i++) {
816                 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n",
817                         part->mbd.mtd->name, i, part->blocks[i].erases);
818         }
819
820         del_mtd_blktrans_dev(dev);
821         vfree(part->sector_map);
822         kfree(part->header_cache);
823         kfree(part->blocks);
824         kfree(part);
825 }
826
827 struct mtd_blktrans_ops rfd_ftl_tr = {
828         .name           = "rfd",
829         .major          = RFD_FTL_MAJOR,
830         .part_bits      = PART_BITS,
831         .readsect       = rfd_ftl_readsect,
832         .writesect      = rfd_ftl_writesect,
833         .getgeo         = rfd_ftl_getgeo,
834         .add_mtd        = rfd_ftl_add_mtd,
835         .remove_dev     = rfd_ftl_remove_dev,
836         .owner          = THIS_MODULE,
837 };
838
839 static int __init init_rfd_ftl(void)
840 {
841         return register_mtd_blktrans(&rfd_ftl_tr);
842 }
843
844 static void __exit cleanup_rfd_ftl(void)
845 {
846         deregister_mtd_blktrans(&rfd_ftl_tr);
847 }
848
849 module_init(init_rfd_ftl);
850 module_exit(cleanup_rfd_ftl);
851
852 MODULE_LICENSE("GPL");
853 MODULE_AUTHOR("Sean Young <sean@mess.org>");
854 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
855                 "used by General Software's Embedded BIOS");
856