Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6.git] / 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  * 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
24 #define const_cpu_to_le16       __constant_cpu_to_le16
25
26 static int block_size = 0;
27 module_param(block_size, int, 0);
28 MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");
29
30 #define PREFIX "rfd_ftl: "
31
32 /* This major has been assigned by device@lanana.org */
33 #ifndef RFD_FTL_MAJOR
34 #define RFD_FTL_MAJOR           256
35 #endif
36
37 /* Maximum number of partitions in an FTL region */
38 #define PART_BITS               4
39
40 /* An erase unit should start with this value */
41 #define RFD_MAGIC               0x9193
42
43 /* the second value is 0xffff or 0xffc8; function unknown */
44
45 /* the third value is always 0xffff, ignored */
46
47 /* next is an array of mapping for each corresponding sector */
48 #define HEADER_MAP_OFFSET       3
49 #define SECTOR_DELETED          0x0000
50 #define SECTOR_ZERO             0xfffe
51 #define SECTOR_FREE             0xffff
52
53 #define SECTOR_SIZE             512
54
55 #define SECTORS_PER_TRACK       63
56
57 struct block {
58         enum {
59                 BLOCK_OK,
60                 BLOCK_ERASING,
61                 BLOCK_ERASED,
62                 BLOCK_UNUSED,
63                 BLOCK_FAILED
64         } state;
65         int free_sectors;
66         int used_sectors;
67         int erases;
68         u_long offset;
69 };
70
71 struct partition {
72         struct mtd_blktrans_dev mbd;
73
74         u_int block_size;               /* size of erase unit */
75         u_int total_blocks;             /* number of erase units */
76         u_int header_sectors_per_block; /* header sectors in erase unit */
77         u_int data_sectors_per_block;   /* data sectors in erase unit */
78         u_int sector_count;             /* sectors in translated disk */
79         u_int header_size;              /* bytes in header sector */
80         int reserved_block;             /* block next up for reclaim */
81         int current_block;              /* block to write to */
82         u16 *header_cache;              /* cached header */
83
84         int is_reclaiming;
85         int cylinders;
86         int errors;
87         u_long *sector_map;
88         struct block *blocks;
89 };
90
91 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf);
92
93 static int build_block_map(struct partition *part, int block_no)
94 {
95         struct block *block = &part->blocks[block_no];
96         int i;
97
98         block->offset = part->block_size * block_no;
99
100         if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) {
101                 block->state = BLOCK_UNUSED;
102                 return -ENOENT;
103         }
104
105         block->state = BLOCK_OK;
106
107         for (i=0; i<part->data_sectors_per_block; i++) {
108                 u16 entry;
109
110                 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
111
112                 if (entry == SECTOR_DELETED)
113                         continue;
114
115                 if (entry == SECTOR_FREE) {
116                         block->free_sectors++;
117                         continue;
118                 }
119
120                 if (entry == SECTOR_ZERO)
121                         entry = 0;
122
123                 if (entry >= part->sector_count) {
124                         printk(KERN_WARNING PREFIX
125                                 "'%s': unit #%d: entry %d corrupt, "
126                                 "sector %d out of range\n",
127                                 part->mbd.mtd->name, block_no, i, entry);
128                         continue;
129                 }
130
131                 if (part->sector_map[entry] != -1) {
132                         printk(KERN_WARNING PREFIX
133                                 "'%s': more than one entry for sector %d\n",
134                                 part->mbd.mtd->name, entry);
135                         part->errors = 1;
136                         continue;
137                 }
138
139                 part->sector_map[entry] = block->offset +
140                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
141
142                 block->used_sectors++;
143         }
144
145         if (block->free_sectors == part->data_sectors_per_block)
146                 part->reserved_block = block_no;
147
148         return 0;
149 }
150
151 static int scan_header(struct partition *part)
152 {
153         int sectors_per_block;
154         int i, rc = -ENOMEM;
155         int blocks_found;
156         size_t retlen;
157
158         sectors_per_block = part->block_size / SECTOR_SIZE;
159         part->total_blocks = part->mbd.mtd->size / part->block_size;
160
161         if (part->total_blocks < 2)
162                 return -ENOENT;
163
164         /* each erase block has three bytes header, followed by the map */
165         part->header_sectors_per_block =
166                         ((HEADER_MAP_OFFSET + sectors_per_block) *
167                         sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
168
169         part->data_sectors_per_block = sectors_per_block -
170                         part->header_sectors_per_block;
171
172         part->header_size = (HEADER_MAP_OFFSET +
173                         part->data_sectors_per_block) * sizeof(u16);
174
175         part->cylinders = (part->data_sectors_per_block *
176                         (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
177
178         part->sector_count = part->cylinders * SECTORS_PER_TRACK;
179
180         part->current_block = -1;
181         part->reserved_block = -1;
182         part->is_reclaiming = 0;
183
184         part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
185         if (!part->header_cache)
186                 goto err;
187
188         part->blocks = kcalloc(part->total_blocks, sizeof(struct block),
189                         GFP_KERNEL);
190         if (!part->blocks)
191                 goto err;
192
193         part->sector_map = vmalloc(part->sector_count * sizeof(u_long));
194         if (!part->sector_map) {
195                 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for "
196                         "sector map", part->mbd.mtd->name);
197                 goto err;
198         }
199
200         for (i=0; i<part->sector_count; i++)
201                 part->sector_map[i] = -1;
202
203         for (i=0, blocks_found=0; i<part->total_blocks; i++) {
204                 rc = part->mbd.mtd->read(part->mbd.mtd,
205                                 i * part->block_size, part->header_size,
206                                 &retlen, (u_char*)part->header_cache);
207
208                 if (!rc && retlen != part->header_size)
209                         rc = -EIO;
210
211                 if (rc)
212                         goto err;
213
214                 if (!build_block_map(part, i))
215                         blocks_found++;
216         }
217
218         if (blocks_found == 0) {
219                 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
220                                 part->mbd.mtd->name);
221                 rc = -ENOENT;
222                 goto err;
223         }
224
225         if (part->reserved_block == -1) {
226                 printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n",
227                                 part->mbd.mtd->name);
228
229                 part->errors = 1;
230         }
231
232         return 0;
233
234 err:
235         vfree(part->sector_map);
236         kfree(part->header_cache);
237         kfree(part->blocks);
238
239         return rc;
240 }
241
242 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
243 {
244         struct partition *part = (struct partition*)dev;
245         u_long addr;
246         size_t retlen;
247         int rc;
248
249         if (sector >= part->sector_count)
250                 return -EIO;
251
252         addr = part->sector_map[sector];
253         if (addr != -1) {
254                 rc = part->mbd.mtd->read(part->mbd.mtd, addr, SECTOR_SIZE,
255                                                 &retlen, (u_char*)buf);
256                 if (!rc && retlen != SECTOR_SIZE)
257                         rc = -EIO;
258
259                 if (rc) {
260                         printk(KERN_WARNING PREFIX "error reading '%s' at "
261                                 "0x%lx\n", part->mbd.mtd->name, addr);
262                         return rc;
263                 }
264         } else
265                 memset(buf, 0, SECTOR_SIZE);
266
267         return 0;
268 }
269
270 static void erase_callback(struct erase_info *erase)
271 {
272         struct partition *part;
273         u16 magic;
274         int i, rc;
275         size_t retlen;
276
277         part = (struct partition*)erase->priv;
278
279         i = erase->addr / part->block_size;
280         if (i >= part->total_blocks || part->blocks[i].offset != erase->addr) {
281                 printk(KERN_ERR PREFIX "erase callback for unknown offset %x "
282                                 "on '%s'\n", 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%x on '%s', "
288                                 "state %d\n", 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 = const_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 %x,%x on '%s' "
349                                 "failed\n", erase->addr, erase->len,
350                                 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 = 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_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)
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         kfree(part);
822 }
823
824 static struct mtd_blktrans_ops rfd_ftl_tr = {
825         .name           = "rfd",
826         .major          = RFD_FTL_MAJOR,
827         .part_bits      = PART_BITS,
828         .blksize        = SECTOR_SIZE,
829
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