2 * Simple MTD partitioning layer
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
8 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
9 * added support for read_oob, write_oob
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/list.h>
17 #include <linux/kmod.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/mtd/compatmac.h>
22 /* Our partition linked list */
23 static LIST_HEAD(mtd_partitions
);
25 /* Our partition node structure */
28 struct mtd_info
*master
;
31 struct list_head list
;
36 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
37 * the pointer to that structure with this macro.
39 #define PART(x) ((struct mtd_part *)(x))
43 * MTD methods which simply translate the effective address and pass through
44 * to the _real_ device.
47 static int part_read (struct mtd_info
*mtd
, loff_t from
, size_t len
,
48 size_t *retlen
, u_char
*buf
)
50 struct mtd_part
*part
= PART(mtd
);
53 if (from
>= mtd
->size
)
55 else if (from
+ len
> mtd
->size
)
56 len
= mtd
->size
- from
;
57 res
= part
->master
->read (part
->master
, from
+ part
->offset
,
61 mtd
->ecc_stats
.corrected
++;
63 mtd
->ecc_stats
.failed
++;
68 static int part_point (struct mtd_info
*mtd
, loff_t from
, size_t len
,
69 size_t *retlen
, void **virt
, resource_size_t
*phys
)
71 struct mtd_part
*part
= PART(mtd
);
72 if (from
>= mtd
->size
)
74 else if (from
+ len
> mtd
->size
)
75 len
= mtd
->size
- from
;
76 return part
->master
->point (part
->master
, from
+ part
->offset
,
77 len
, retlen
, virt
, phys
);
80 static void part_unpoint(struct mtd_info
*mtd
, loff_t from
, size_t len
)
82 struct mtd_part
*part
= PART(mtd
);
84 part
->master
->unpoint(part
->master
, from
+ part
->offset
, len
);
87 static int part_read_oob(struct mtd_info
*mtd
, loff_t from
,
88 struct mtd_oob_ops
*ops
)
90 struct mtd_part
*part
= PART(mtd
);
93 if (from
>= mtd
->size
)
95 if (ops
->datbuf
&& from
+ ops
->len
> mtd
->size
)
97 res
= part
->master
->read_oob(part
->master
, from
+ part
->offset
, ops
);
101 mtd
->ecc_stats
.corrected
++;
103 mtd
->ecc_stats
.failed
++;
108 static int part_read_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
109 size_t *retlen
, u_char
*buf
)
111 struct mtd_part
*part
= PART(mtd
);
112 return part
->master
->read_user_prot_reg (part
->master
, from
,
116 static int part_get_user_prot_info (struct mtd_info
*mtd
,
117 struct otp_info
*buf
, size_t len
)
119 struct mtd_part
*part
= PART(mtd
);
120 return part
->master
->get_user_prot_info (part
->master
, buf
, len
);
123 static int part_read_fact_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
124 size_t *retlen
, u_char
*buf
)
126 struct mtd_part
*part
= PART(mtd
);
127 return part
->master
->read_fact_prot_reg (part
->master
, from
,
131 static int part_get_fact_prot_info (struct mtd_info
*mtd
,
132 struct otp_info
*buf
, size_t len
)
134 struct mtd_part
*part
= PART(mtd
);
135 return part
->master
->get_fact_prot_info (part
->master
, buf
, len
);
138 static int part_write (struct mtd_info
*mtd
, loff_t to
, size_t len
,
139 size_t *retlen
, const u_char
*buf
)
141 struct mtd_part
*part
= PART(mtd
);
142 if (!(mtd
->flags
& MTD_WRITEABLE
))
146 else if (to
+ len
> mtd
->size
)
147 len
= mtd
->size
- to
;
148 return part
->master
->write (part
->master
, to
+ part
->offset
,
152 static int part_panic_write (struct mtd_info
*mtd
, loff_t to
, size_t len
,
153 size_t *retlen
, const u_char
*buf
)
155 struct mtd_part
*part
= PART(mtd
);
156 if (!(mtd
->flags
& MTD_WRITEABLE
))
160 else if (to
+ len
> mtd
->size
)
161 len
= mtd
->size
- to
;
162 return part
->master
->panic_write (part
->master
, to
+ part
->offset
,
166 static int part_write_oob(struct mtd_info
*mtd
, loff_t to
,
167 struct mtd_oob_ops
*ops
)
169 struct mtd_part
*part
= PART(mtd
);
171 if (!(mtd
->flags
& MTD_WRITEABLE
))
176 if (ops
->datbuf
&& to
+ ops
->len
> mtd
->size
)
178 return part
->master
->write_oob(part
->master
, to
+ part
->offset
, ops
);
181 static int part_write_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
182 size_t *retlen
, u_char
*buf
)
184 struct mtd_part
*part
= PART(mtd
);
185 return part
->master
->write_user_prot_reg (part
->master
, from
,
189 static int part_lock_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
)
191 struct mtd_part
*part
= PART(mtd
);
192 return part
->master
->lock_user_prot_reg (part
->master
, from
, len
);
195 static int part_writev (struct mtd_info
*mtd
, const struct kvec
*vecs
,
196 unsigned long count
, loff_t to
, size_t *retlen
)
198 struct mtd_part
*part
= PART(mtd
);
199 if (!(mtd
->flags
& MTD_WRITEABLE
))
201 return part
->master
->writev (part
->master
, vecs
, count
,
202 to
+ part
->offset
, retlen
);
205 static int part_erase (struct mtd_info
*mtd
, struct erase_info
*instr
)
207 struct mtd_part
*part
= PART(mtd
);
209 if (!(mtd
->flags
& MTD_WRITEABLE
))
211 if (instr
->addr
>= mtd
->size
)
213 instr
->addr
+= part
->offset
;
214 ret
= part
->master
->erase(part
->master
, instr
);
216 if (instr
->fail_addr
!= 0xffffffff)
217 instr
->fail_addr
-= part
->offset
;
218 instr
->addr
-= part
->offset
;
223 void mtd_erase_callback(struct erase_info
*instr
)
225 if (instr
->mtd
->erase
== part_erase
) {
226 struct mtd_part
*part
= PART(instr
->mtd
);
228 if (instr
->fail_addr
!= 0xffffffff)
229 instr
->fail_addr
-= part
->offset
;
230 instr
->addr
-= part
->offset
;
233 instr
->callback(instr
);
235 EXPORT_SYMBOL_GPL(mtd_erase_callback
);
237 static int part_lock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
239 struct mtd_part
*part
= PART(mtd
);
240 if ((len
+ ofs
) > mtd
->size
)
242 return part
->master
->lock(part
->master
, ofs
+ part
->offset
, len
);
245 static int part_unlock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
247 struct mtd_part
*part
= PART(mtd
);
248 if ((len
+ ofs
) > mtd
->size
)
250 return part
->master
->unlock(part
->master
, ofs
+ part
->offset
, len
);
253 static void part_sync(struct mtd_info
*mtd
)
255 struct mtd_part
*part
= PART(mtd
);
256 part
->master
->sync(part
->master
);
259 static int part_suspend(struct mtd_info
*mtd
)
261 struct mtd_part
*part
= PART(mtd
);
262 return part
->master
->suspend(part
->master
);
265 static void part_resume(struct mtd_info
*mtd
)
267 struct mtd_part
*part
= PART(mtd
);
268 part
->master
->resume(part
->master
);
271 static int part_block_isbad (struct mtd_info
*mtd
, loff_t ofs
)
273 struct mtd_part
*part
= PART(mtd
);
274 if (ofs
>= mtd
->size
)
277 return part
->master
->block_isbad(part
->master
, ofs
);
280 static int part_block_markbad (struct mtd_info
*mtd
, loff_t ofs
)
282 struct mtd_part
*part
= PART(mtd
);
285 if (!(mtd
->flags
& MTD_WRITEABLE
))
287 if (ofs
>= mtd
->size
)
290 res
= part
->master
->block_markbad(part
->master
, ofs
);
292 mtd
->ecc_stats
.badblocks
++;
297 * This function unregisters and destroy all slave MTD objects which are
298 * attached to the given master MTD object.
301 int del_mtd_partitions(struct mtd_info
*master
)
303 struct mtd_part
*slave
, *next
;
305 list_for_each_entry_safe(slave
, next
, &mtd_partitions
, list
)
306 if (slave
->master
== master
) {
307 list_del(&slave
->list
);
308 if(slave
->registered
)
309 del_mtd_device(&slave
->mtd
);
317 * This function, given a master MTD object and a partition table, creates
318 * and registers slave MTD objects which are bound to the master according to
319 * the partition definitions.
320 * (Q: should we register the master MTD object as well?)
323 int add_mtd_partitions(struct mtd_info
*master
,
324 const struct mtd_partition
*parts
,
327 struct mtd_part
*slave
;
328 u_int32_t cur_offset
= 0;
331 printk (KERN_NOTICE
"Creating %d MTD partitions on \"%s\":\n", nbparts
, master
->name
);
333 for (i
= 0; i
< nbparts
; i
++) {
335 /* allocate the partition structure */
336 slave
= kzalloc (sizeof(*slave
), GFP_KERNEL
);
338 printk ("memory allocation error while creating partitions for \"%s\"\n",
340 del_mtd_partitions(master
);
343 list_add(&slave
->list
, &mtd_partitions
);
345 /* set up the MTD object for this partition */
346 slave
->mtd
.type
= master
->type
;
347 slave
->mtd
.flags
= master
->flags
& ~parts
[i
].mask_flags
;
348 slave
->mtd
.size
= parts
[i
].size
;
349 slave
->mtd
.writesize
= master
->writesize
;
350 slave
->mtd
.oobsize
= master
->oobsize
;
351 slave
->mtd
.oobavail
= master
->oobavail
;
352 slave
->mtd
.subpage_sft
= master
->subpage_sft
;
354 slave
->mtd
.name
= parts
[i
].name
;
355 slave
->mtd
.owner
= master
->owner
;
357 slave
->mtd
.read
= part_read
;
358 slave
->mtd
.write
= part_write
;
360 if (master
->panic_write
)
361 slave
->mtd
.panic_write
= part_panic_write
;
363 if(master
->point
&& master
->unpoint
){
364 slave
->mtd
.point
= part_point
;
365 slave
->mtd
.unpoint
= part_unpoint
;
368 if (master
->read_oob
)
369 slave
->mtd
.read_oob
= part_read_oob
;
370 if (master
->write_oob
)
371 slave
->mtd
.write_oob
= part_write_oob
;
372 if(master
->read_user_prot_reg
)
373 slave
->mtd
.read_user_prot_reg
= part_read_user_prot_reg
;
374 if(master
->read_fact_prot_reg
)
375 slave
->mtd
.read_fact_prot_reg
= part_read_fact_prot_reg
;
376 if(master
->write_user_prot_reg
)
377 slave
->mtd
.write_user_prot_reg
= part_write_user_prot_reg
;
378 if(master
->lock_user_prot_reg
)
379 slave
->mtd
.lock_user_prot_reg
= part_lock_user_prot_reg
;
380 if(master
->get_user_prot_info
)
381 slave
->mtd
.get_user_prot_info
= part_get_user_prot_info
;
382 if(master
->get_fact_prot_info
)
383 slave
->mtd
.get_fact_prot_info
= part_get_fact_prot_info
;
385 slave
->mtd
.sync
= part_sync
;
386 if (!i
&& master
->suspend
&& master
->resume
) {
387 slave
->mtd
.suspend
= part_suspend
;
388 slave
->mtd
.resume
= part_resume
;
391 slave
->mtd
.writev
= part_writev
;
393 slave
->mtd
.lock
= part_lock
;
395 slave
->mtd
.unlock
= part_unlock
;
396 if (master
->block_isbad
)
397 slave
->mtd
.block_isbad
= part_block_isbad
;
398 if (master
->block_markbad
)
399 slave
->mtd
.block_markbad
= part_block_markbad
;
400 slave
->mtd
.erase
= part_erase
;
401 slave
->master
= master
;
402 slave
->offset
= parts
[i
].offset
;
405 if (slave
->offset
== MTDPART_OFS_APPEND
)
406 slave
->offset
= cur_offset
;
407 if (slave
->offset
== MTDPART_OFS_NXTBLK
) {
408 slave
->offset
= cur_offset
;
409 if ((cur_offset
% master
->erasesize
) != 0) {
410 /* Round up to next erasesize */
411 slave
->offset
= ((cur_offset
/ master
->erasesize
) + 1) * master
->erasesize
;
412 printk(KERN_NOTICE
"Moving partition %d: "
413 "0x%08x -> 0x%08x\n", i
,
414 cur_offset
, slave
->offset
);
417 if (slave
->mtd
.size
== MTDPART_SIZ_FULL
)
418 slave
->mtd
.size
= master
->size
- slave
->offset
;
419 cur_offset
= slave
->offset
+ slave
->mtd
.size
;
421 printk (KERN_NOTICE
"0x%08x-0x%08x : \"%s\"\n", slave
->offset
,
422 slave
->offset
+ slave
->mtd
.size
, slave
->mtd
.name
);
424 /* let's do some sanity checks */
425 if (slave
->offset
>= master
->size
) {
426 /* let's register it anyway to preserve ordering */
429 printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
432 if (slave
->offset
+ slave
->mtd
.size
> master
->size
) {
433 slave
->mtd
.size
= master
->size
- slave
->offset
;
434 printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
435 parts
[i
].name
, master
->name
, slave
->mtd
.size
);
437 if (master
->numeraseregions
>1) {
438 /* Deal with variable erase size stuff */
440 struct mtd_erase_region_info
*regions
= master
->eraseregions
;
442 /* Find the first erase regions which is part of this partition. */
443 for (i
=0; i
< master
->numeraseregions
&& slave
->offset
>= regions
[i
].offset
; i
++)
446 for (i
--; i
< master
->numeraseregions
&& slave
->offset
+ slave
->mtd
.size
> regions
[i
].offset
; i
++) {
447 if (slave
->mtd
.erasesize
< regions
[i
].erasesize
) {
448 slave
->mtd
.erasesize
= regions
[i
].erasesize
;
452 /* Single erase size */
453 slave
->mtd
.erasesize
= master
->erasesize
;
456 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
457 (slave
->offset
% slave
->mtd
.erasesize
)) {
458 /* Doesn't start on a boundary of major erase size */
459 /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
460 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
461 printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
464 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
465 (slave
->mtd
.size
% slave
->mtd
.erasesize
)) {
466 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
467 printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
471 slave
->mtd
.ecclayout
= master
->ecclayout
;
472 if (master
->block_isbad
) {
475 while(offs
< slave
->mtd
.size
) {
476 if (master
->block_isbad(master
,
477 offs
+ slave
->offset
))
478 slave
->mtd
.ecc_stats
.badblocks
++;
479 offs
+= slave
->mtd
.erasesize
;
484 { /* store the object pointer (caller may or may not register it */
485 *parts
[i
].mtdp
= &slave
->mtd
;
486 slave
->registered
= 0;
490 /* register our partition */
491 add_mtd_device(&slave
->mtd
);
492 slave
->registered
= 1;
499 EXPORT_SYMBOL(add_mtd_partitions
);
500 EXPORT_SYMBOL(del_mtd_partitions
);
502 static DEFINE_SPINLOCK(part_parser_lock
);
503 static LIST_HEAD(part_parsers
);
505 static struct mtd_part_parser
*get_partition_parser(const char *name
)
507 struct mtd_part_parser
*p
, *ret
= NULL
;
509 spin_lock(&part_parser_lock
);
511 list_for_each_entry(p
, &part_parsers
, list
)
512 if (!strcmp(p
->name
, name
) && try_module_get(p
->owner
)) {
517 spin_unlock(&part_parser_lock
);
522 int register_mtd_parser(struct mtd_part_parser
*p
)
524 spin_lock(&part_parser_lock
);
525 list_add(&p
->list
, &part_parsers
);
526 spin_unlock(&part_parser_lock
);
531 int deregister_mtd_parser(struct mtd_part_parser
*p
)
533 spin_lock(&part_parser_lock
);
535 spin_unlock(&part_parser_lock
);
539 int parse_mtd_partitions(struct mtd_info
*master
, const char **types
,
540 struct mtd_partition
**pparts
, unsigned long origin
)
542 struct mtd_part_parser
*parser
;
545 for ( ; ret
<= 0 && *types
; types
++) {
546 parser
= get_partition_parser(*types
);
548 if (!parser
&& !request_module("%s", *types
))
549 parser
= get_partition_parser(*types
);
552 printk(KERN_NOTICE
"%s partition parsing not available\n",
556 ret
= (*parser
->parse_fn
)(master
, pparts
, origin
);
558 printk(KERN_NOTICE
"%d %s partitions found on MTD device %s\n",
559 ret
, parser
->name
, master
->name
);
561 put_partition_parser(parser
);
566 EXPORT_SYMBOL_GPL(parse_mtd_partitions
);
567 EXPORT_SYMBOL_GPL(register_mtd_parser
);
568 EXPORT_SYMBOL_GPL(deregister_mtd_parser
);
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