Merge tag 'sound-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
[pandora-kernel.git] / drivers / mtd / rfd_ftl.c
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 = mtd_read(part->mbd.mtd, i * part->block_size,
204                               part->header_size, &retlen,
205                               (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 = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
254                               (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 = mtd_write(part->mbd.mtd, part->blocks[i].offset, sizeof(magic),
308                        &retlen, (u_char *)&magic);
309
310         if (!rc && retlen != sizeof(magic))
311                 rc = -EIO;
312
313         if (rc) {
314                 printk(KERN_ERR PREFIX "'%s': unable to write RFD "
315                                 "header at 0x%lx\n",
316                                 part->mbd.mtd->name,
317                                 part->blocks[i].offset);
318                 part->blocks[i].state = BLOCK_FAILED;
319         }
320         else
321                 part->blocks[i].state = BLOCK_OK;
322
323         kfree(erase);
324 }
325
326 static int erase_block(struct partition *part, int block)
327 {
328         struct erase_info *erase;
329         int rc = -ENOMEM;
330
331         erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
332         if (!erase)
333                 goto err;
334
335         erase->mtd = part->mbd.mtd;
336         erase->callback = erase_callback;
337         erase->addr = part->blocks[block].offset;
338         erase->len = part->block_size;
339         erase->priv = (u_long)part;
340
341         part->blocks[block].state = BLOCK_ERASING;
342         part->blocks[block].free_sectors = 0;
343
344         rc = mtd_erase(part->mbd.mtd, erase);
345
346         if (rc) {
347                 printk(KERN_ERR PREFIX "erase of region %llx,%llx on '%s' "
348                                 "failed\n", (unsigned long long)erase->addr,
349                                 (unsigned long long)erase->len, part->mbd.mtd->name);
350                 kfree(erase);
351         }
352
353 err:
354         return rc;
355 }
356
357 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
358 {
359         void *sector_data;
360         u16 *map;
361         size_t retlen;
362         int i, rc = -ENOMEM;
363
364         part->is_reclaiming = 1;
365
366         sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
367         if (!sector_data)
368                 goto err3;
369
370         map = kmalloc(part->header_size, GFP_KERNEL);
371         if (!map)
372                 goto err2;
373
374         rc = mtd_read(part->mbd.mtd, part->blocks[block_no].offset,
375                       part->header_size, &retlen, (u_char *)map);
376
377         if (!rc && retlen != part->header_size)
378                 rc = -EIO;
379
380         if (rc) {
381                 printk(KERN_ERR PREFIX "error reading '%s' at "
382                         "0x%lx\n", part->mbd.mtd->name,
383                         part->blocks[block_no].offset);
384
385                 goto err;
386         }
387
388         for (i=0; i<part->data_sectors_per_block; i++) {
389                 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
390                 u_long addr;
391
392
393                 if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
394                         continue;
395
396                 if (entry == SECTOR_ZERO)
397                         entry = 0;
398
399                 /* already warned about and ignored in build_block_map() */
400                 if (entry >= part->sector_count)
401                         continue;
402
403                 addr = part->blocks[block_no].offset +
404                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
405
406                 if (*old_sector == addr) {
407                         *old_sector = -1;
408                         if (!part->blocks[block_no].used_sectors--) {
409                                 rc = erase_block(part, block_no);
410                                 break;
411                         }
412                         continue;
413                 }
414                 rc = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
415                               sector_data);
416
417                 if (!rc && retlen != SECTOR_SIZE)
418                         rc = -EIO;
419
420                 if (rc) {
421                         printk(KERN_ERR PREFIX "'%s': Unable to "
422                                 "read sector for relocation\n",
423                                 part->mbd.mtd->name);
424
425                         goto err;
426                 }
427
428                 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
429                                 entry, sector_data);
430
431                 if (rc)
432                         goto err;
433         }
434
435 err:
436         kfree(map);
437 err2:
438         kfree(sector_data);
439 err3:
440         part->is_reclaiming = 0;
441
442         return rc;
443 }
444
445 static int reclaim_block(struct partition *part, u_long *old_sector)
446 {
447         int block, best_block, score, old_sector_block;
448         int rc;
449
450         /* we have a race if sync doesn't exist */
451         mtd_sync(part->mbd.mtd);
452
453         score = 0x7fffffff; /* MAX_INT */
454         best_block = -1;
455         if (*old_sector != -1)
456                 old_sector_block = *old_sector / part->block_size;
457         else
458                 old_sector_block = -1;
459
460         for (block=0; block<part->total_blocks; block++) {
461                 int this_score;
462
463                 if (block == part->reserved_block)
464                         continue;
465
466                 /*
467                  * Postpone reclaiming if there is a free sector as
468                  * more removed sectors is more efficient (have to move
469                  * less).
470                  */
471                 if (part->blocks[block].free_sectors)
472                         return 0;
473
474                 this_score = part->blocks[block].used_sectors;
475
476                 if (block == old_sector_block)
477                         this_score--;
478                 else {
479                         /* no point in moving a full block */
480                         if (part->blocks[block].used_sectors ==
481                                         part->data_sectors_per_block)
482                                 continue;
483                 }
484
485                 this_score += part->blocks[block].erases;
486
487                 if (this_score < score) {
488                         best_block = block;
489                         score = this_score;
490                 }
491         }
492
493         if (best_block == -1)
494                 return -ENOSPC;
495
496         part->current_block = -1;
497         part->reserved_block = best_block;
498
499         pr_debug("reclaim_block: reclaiming block #%d with %d used "
500                  "%d free sectors\n", best_block,
501                  part->blocks[best_block].used_sectors,
502                  part->blocks[best_block].free_sectors);
503
504         if (part->blocks[best_block].used_sectors)
505                 rc = move_block_contents(part, best_block, old_sector);
506         else
507                 rc = erase_block(part, best_block);
508
509         return rc;
510 }
511
512 /*
513  * IMPROVE: It would be best to choose the block with the most deleted sectors,
514  * because if we fill that one up first it'll have the most chance of having
515  * the least live sectors at reclaim.
516  */
517 static int find_free_block(struct partition *part)
518 {
519         int block, stop;
520
521         block = part->current_block == -1 ?
522                         jiffies % part->total_blocks : part->current_block;
523         stop = block;
524
525         do {
526                 if (part->blocks[block].free_sectors &&
527                                 block != part->reserved_block)
528                         return block;
529
530                 if (part->blocks[block].state == BLOCK_UNUSED)
531                         erase_block(part, block);
532
533                 if (++block >= part->total_blocks)
534                         block = 0;
535
536         } while (block != stop);
537
538         return -1;
539 }
540
541 static int find_writable_block(struct partition *part, u_long *old_sector)
542 {
543         int rc, block;
544         size_t retlen;
545
546         block = find_free_block(part);
547
548         if (block == -1) {
549                 if (!part->is_reclaiming) {
550                         rc = reclaim_block(part, old_sector);
551                         if (rc)
552                                 goto err;
553
554                         block = find_free_block(part);
555                 }
556
557                 if (block == -1) {
558                         rc = -ENOSPC;
559                         goto err;
560                 }
561         }
562
563         rc = mtd_read(part->mbd.mtd, part->blocks[block].offset,
564                       part->header_size, &retlen,
565                       (u_char *)part->header_cache);
566
567         if (!rc && retlen != part->header_size)
568                 rc = -EIO;
569
570         if (rc) {
571                 printk(KERN_ERR PREFIX "'%s': unable to read header at "
572                                 "0x%lx\n", part->mbd.mtd->name,
573                                 part->blocks[block].offset);
574                 goto err;
575         }
576
577         part->current_block = block;
578
579 err:
580         return rc;
581 }
582
583 static int mark_sector_deleted(struct partition *part, u_long old_addr)
584 {
585         int block, offset, rc;
586         u_long addr;
587         size_t retlen;
588         u16 del = cpu_to_le16(SECTOR_DELETED);
589
590         block = old_addr / part->block_size;
591         offset = (old_addr % part->block_size) / SECTOR_SIZE -
592                 part->header_sectors_per_block;
593
594         addr = part->blocks[block].offset +
595                         (HEADER_MAP_OFFSET + offset) * sizeof(u16);
596         rc = mtd_write(part->mbd.mtd, addr, sizeof(del), &retlen,
597                        (u_char *)&del);
598
599         if (!rc && retlen != sizeof(del))
600                 rc = -EIO;
601
602         if (rc) {
603                 printk(KERN_ERR PREFIX "error writing '%s' at "
604                         "0x%lx\n", part->mbd.mtd->name, addr);
605                 if (rc)
606                         goto err;
607         }
608         if (block == part->current_block)
609                 part->header_cache[offset + HEADER_MAP_OFFSET] = del;
610
611         part->blocks[block].used_sectors--;
612
613         if (!part->blocks[block].used_sectors &&
614             !part->blocks[block].free_sectors)
615                 rc = erase_block(part, block);
616
617 err:
618         return rc;
619 }
620
621 static int find_free_sector(const struct partition *part, const struct block *block)
622 {
623         int i, stop;
624
625         i = stop = part->data_sectors_per_block - block->free_sectors;
626
627         do {
628                 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i])
629                                 == SECTOR_FREE)
630                         return i;
631
632                 if (++i == part->data_sectors_per_block)
633                         i = 0;
634         }
635         while(i != stop);
636
637         return -1;
638 }
639
640 static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr)
641 {
642         struct partition *part = (struct partition*)dev;
643         struct block *block;
644         u_long addr;
645         int i;
646         int rc;
647         size_t retlen;
648         u16 entry;
649
650         if (part->current_block == -1 ||
651                 !part->blocks[part->current_block].free_sectors) {
652
653                 rc = find_writable_block(part, old_addr);
654                 if (rc)
655                         goto err;
656         }
657
658         block = &part->blocks[part->current_block];
659
660         i = find_free_sector(part, block);
661
662         if (i < 0) {
663                 rc = -ENOSPC;
664                 goto err;
665         }
666
667         addr = (i + part->header_sectors_per_block) * SECTOR_SIZE +
668                 block->offset;
669         rc = mtd_write(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
670                        (u_char *)buf);
671
672         if (!rc && retlen != SECTOR_SIZE)
673                 rc = -EIO;
674
675         if (rc) {
676                 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
677                                 part->mbd.mtd->name, addr);
678                 if (rc)
679                         goto err;
680         }
681
682         part->sector_map[sector] = addr;
683
684         entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector);
685
686         part->header_cache[i + HEADER_MAP_OFFSET] = entry;
687
688         addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16);
689         rc = mtd_write(part->mbd.mtd, addr, sizeof(entry), &retlen,
690                        (u_char *)&entry);
691
692         if (!rc && retlen != sizeof(entry))
693                 rc = -EIO;
694
695         if (rc) {
696                 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
697                                 part->mbd.mtd->name, addr);
698                 if (rc)
699                         goto err;
700         }
701         block->used_sectors++;
702         block->free_sectors--;
703
704 err:
705         return rc;
706 }
707
708 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
709 {
710         struct partition *part = (struct partition*)dev;
711         u_long old_addr;
712         int i;
713         int rc = 0;
714
715         pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector);
716
717         if (part->reserved_block == -1) {
718                 rc = -EACCES;
719                 goto err;
720         }
721
722         if (sector >= part->sector_count) {
723                 rc = -EIO;
724                 goto err;
725         }
726
727         old_addr = part->sector_map[sector];
728
729         for (i=0; i<SECTOR_SIZE; i++) {
730                 if (!buf[i])
731                         continue;
732
733                 rc = do_writesect(dev, sector, buf, &old_addr);
734                 if (rc)
735                         goto err;
736                 break;
737         }
738
739         if (i == SECTOR_SIZE)
740                 part->sector_map[sector] = -1;
741
742         if (old_addr != -1)
743                 rc = mark_sector_deleted(part, old_addr);
744
745 err:
746         return rc;
747 }
748
749 static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
750 {
751         struct partition *part = (struct partition*)dev;
752
753         geo->heads = 1;
754         geo->sectors = SECTORS_PER_TRACK;
755         geo->cylinders = part->cylinders;
756
757         return 0;
758 }
759
760 static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
761 {
762         struct partition *part;
763
764         if (mtd->type != MTD_NORFLASH || mtd->size > UINT_MAX)
765                 return;
766
767         part = kzalloc(sizeof(struct partition), GFP_KERNEL);
768         if (!part)
769                 return;
770
771         part->mbd.mtd = mtd;
772
773         if (block_size)
774                 part->block_size = block_size;
775         else {
776                 if (!mtd->erasesize) {
777                         printk(KERN_WARNING PREFIX "please provide block_size");
778                         goto out;
779                 } else
780                         part->block_size = mtd->erasesize;
781         }
782
783         if (scan_header(part) == 0) {
784                 part->mbd.size = part->sector_count;
785                 part->mbd.tr = tr;
786                 part->mbd.devnum = -1;
787                 if (!(mtd->flags & MTD_WRITEABLE))
788                         part->mbd.readonly = 1;
789                 else if (part->errors) {
790                         printk(KERN_WARNING PREFIX "'%s': errors found, "
791                                         "setting read-only\n", mtd->name);
792                         part->mbd.readonly = 1;
793                 }
794
795                 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
796                                 mtd->name, mtd->type, mtd->flags);
797
798                 if (!add_mtd_blktrans_dev((void*)part))
799                         return;
800         }
801 out:
802         kfree(part);
803 }
804
805 static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
806 {
807         struct partition *part = (struct partition*)dev;
808         int i;
809
810         for (i=0; i<part->total_blocks; i++) {
811                 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n",
812                         part->mbd.mtd->name, i, part->blocks[i].erases);
813         }
814
815         del_mtd_blktrans_dev(dev);
816         vfree(part->sector_map);
817         kfree(part->header_cache);
818         kfree(part->blocks);
819 }
820
821 static struct mtd_blktrans_ops rfd_ftl_tr = {
822         .name           = "rfd",
823         .major          = RFD_FTL_MAJOR,
824         .part_bits      = PART_BITS,
825         .blksize        = SECTOR_SIZE,
826
827         .readsect       = rfd_ftl_readsect,
828         .writesect      = rfd_ftl_writesect,
829         .getgeo         = rfd_ftl_getgeo,
830         .add_mtd        = rfd_ftl_add_mtd,
831         .remove_dev     = rfd_ftl_remove_dev,
832         .owner          = THIS_MODULE,
833 };
834
835 static int __init init_rfd_ftl(void)
836 {
837         return register_mtd_blktrans(&rfd_ftl_tr);
838 }
839
840 static void __exit cleanup_rfd_ftl(void)
841 {
842         deregister_mtd_blktrans(&rfd_ftl_tr);
843 }
844
845 module_init(init_rfd_ftl);
846 module_exit(cleanup_rfd_ftl);
847
848 MODULE_LICENSE("GPL");
849 MODULE_AUTHOR("Sean Young <sean@mess.org>");
850 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
851                 "used by General Software's Embedded BIOS");
852