2 * Simple MTD partitioning layer
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
8 * $Id: mtdpart.c,v 1.55 2005/11/07 11:14:20 gleixner Exp $
10 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
11 * added support for read_oob, write_oob
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/list.h>
19 #include <linux/kmod.h>
20 #include <linux/mtd/mtd.h>
21 #include <linux/mtd/partitions.h>
22 #include <linux/mtd/compatmac.h>
24 /* Our partition linked list */
25 static LIST_HEAD(mtd_partitions
);
27 /* Our partition node structure */
30 struct mtd_info
*master
;
33 struct list_head list
;
38 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
39 * the pointer to that structure with this macro.
41 #define PART(x) ((struct mtd_part *)(x))
45 * MTD methods which simply translate the effective address and pass through
46 * to the _real_ device.
49 static int part_read (struct mtd_info
*mtd
, loff_t from
, size_t len
,
50 size_t *retlen
, u_char
*buf
)
52 struct mtd_part
*part
= PART(mtd
);
55 if (from
>= mtd
->size
)
57 else if (from
+ len
> mtd
->size
)
58 len
= mtd
->size
- from
;
59 res
= part
->master
->read (part
->master
, from
+ part
->offset
,
63 mtd
->ecc_stats
.corrected
++;
65 mtd
->ecc_stats
.failed
++;
70 static int part_point (struct mtd_info
*mtd
, loff_t from
, size_t len
,
71 size_t *retlen
, void **virt
, resource_size_t
*phys
)
73 struct mtd_part
*part
= PART(mtd
);
74 if (from
>= mtd
->size
)
76 else if (from
+ len
> mtd
->size
)
77 len
= mtd
->size
- from
;
78 return part
->master
->point (part
->master
, from
+ part
->offset
,
79 len
, retlen
, virt
, phys
);
82 static void part_unpoint(struct mtd_info
*mtd
, loff_t from
, size_t len
)
84 struct mtd_part
*part
= PART(mtd
);
86 part
->master
->unpoint(part
->master
, from
+ part
->offset
, len
);
89 static int part_read_oob(struct mtd_info
*mtd
, loff_t from
,
90 struct mtd_oob_ops
*ops
)
92 struct mtd_part
*part
= PART(mtd
);
95 if (from
>= mtd
->size
)
97 if (ops
->datbuf
&& from
+ ops
->len
> mtd
->size
)
99 res
= part
->master
->read_oob(part
->master
, from
+ part
->offset
, ops
);
103 mtd
->ecc_stats
.corrected
++;
105 mtd
->ecc_stats
.failed
++;
110 static int part_read_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
111 size_t *retlen
, u_char
*buf
)
113 struct mtd_part
*part
= PART(mtd
);
114 return part
->master
->read_user_prot_reg (part
->master
, from
,
118 static int part_get_user_prot_info (struct mtd_info
*mtd
,
119 struct otp_info
*buf
, size_t len
)
121 struct mtd_part
*part
= PART(mtd
);
122 return part
->master
->get_user_prot_info (part
->master
, buf
, len
);
125 static int part_read_fact_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
126 size_t *retlen
, u_char
*buf
)
128 struct mtd_part
*part
= PART(mtd
);
129 return part
->master
->read_fact_prot_reg (part
->master
, from
,
133 static int part_get_fact_prot_info (struct mtd_info
*mtd
,
134 struct otp_info
*buf
, size_t len
)
136 struct mtd_part
*part
= PART(mtd
);
137 return part
->master
->get_fact_prot_info (part
->master
, buf
, len
);
140 static int part_write (struct mtd_info
*mtd
, loff_t to
, size_t len
,
141 size_t *retlen
, const u_char
*buf
)
143 struct mtd_part
*part
= PART(mtd
);
144 if (!(mtd
->flags
& MTD_WRITEABLE
))
148 else if (to
+ len
> mtd
->size
)
149 len
= mtd
->size
- to
;
150 return part
->master
->write (part
->master
, to
+ part
->offset
,
154 static int part_panic_write (struct mtd_info
*mtd
, loff_t to
, size_t len
,
155 size_t *retlen
, const u_char
*buf
)
157 struct mtd_part
*part
= PART(mtd
);
158 if (!(mtd
->flags
& MTD_WRITEABLE
))
162 else if (to
+ len
> mtd
->size
)
163 len
= mtd
->size
- to
;
164 return part
->master
->panic_write (part
->master
, to
+ part
->offset
,
168 static int part_write_oob(struct mtd_info
*mtd
, loff_t to
,
169 struct mtd_oob_ops
*ops
)
171 struct mtd_part
*part
= PART(mtd
);
173 if (!(mtd
->flags
& MTD_WRITEABLE
))
178 if (ops
->datbuf
&& to
+ ops
->len
> mtd
->size
)
180 return part
->master
->write_oob(part
->master
, to
+ part
->offset
, ops
);
183 static int part_write_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
184 size_t *retlen
, u_char
*buf
)
186 struct mtd_part
*part
= PART(mtd
);
187 return part
->master
->write_user_prot_reg (part
->master
, from
,
191 static int part_lock_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
)
193 struct mtd_part
*part
= PART(mtd
);
194 return part
->master
->lock_user_prot_reg (part
->master
, from
, len
);
197 static int part_writev (struct mtd_info
*mtd
, const struct kvec
*vecs
,
198 unsigned long count
, loff_t to
, size_t *retlen
)
200 struct mtd_part
*part
= PART(mtd
);
201 if (!(mtd
->flags
& MTD_WRITEABLE
))
203 return part
->master
->writev (part
->master
, vecs
, count
,
204 to
+ part
->offset
, retlen
);
207 static int part_erase (struct mtd_info
*mtd
, struct erase_info
*instr
)
209 struct mtd_part
*part
= PART(mtd
);
211 if (!(mtd
->flags
& MTD_WRITEABLE
))
213 if (instr
->addr
>= mtd
->size
)
215 instr
->addr
+= part
->offset
;
216 ret
= part
->master
->erase(part
->master
, instr
);
218 if (instr
->fail_addr
!= 0xffffffff)
219 instr
->fail_addr
-= part
->offset
;
220 instr
->addr
-= part
->offset
;
225 void mtd_erase_callback(struct erase_info
*instr
)
227 if (instr
->mtd
->erase
== part_erase
) {
228 struct mtd_part
*part
= PART(instr
->mtd
);
230 if (instr
->fail_addr
!= 0xffffffff)
231 instr
->fail_addr
-= part
->offset
;
232 instr
->addr
-= part
->offset
;
235 instr
->callback(instr
);
237 EXPORT_SYMBOL_GPL(mtd_erase_callback
);
239 static int part_lock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
241 struct mtd_part
*part
= PART(mtd
);
242 if ((len
+ ofs
) > mtd
->size
)
244 return part
->master
->lock(part
->master
, ofs
+ part
->offset
, len
);
247 static int part_unlock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
249 struct mtd_part
*part
= PART(mtd
);
250 if ((len
+ ofs
) > mtd
->size
)
252 return part
->master
->unlock(part
->master
, ofs
+ part
->offset
, len
);
255 static void part_sync(struct mtd_info
*mtd
)
257 struct mtd_part
*part
= PART(mtd
);
258 part
->master
->sync(part
->master
);
261 static int part_suspend(struct mtd_info
*mtd
)
263 struct mtd_part
*part
= PART(mtd
);
264 return part
->master
->suspend(part
->master
);
267 static void part_resume(struct mtd_info
*mtd
)
269 struct mtd_part
*part
= PART(mtd
);
270 part
->master
->resume(part
->master
);
273 static int part_block_isbad (struct mtd_info
*mtd
, loff_t ofs
)
275 struct mtd_part
*part
= PART(mtd
);
276 if (ofs
>= mtd
->size
)
279 return part
->master
->block_isbad(part
->master
, ofs
);
282 static int part_block_markbad (struct mtd_info
*mtd
, loff_t ofs
)
284 struct mtd_part
*part
= PART(mtd
);
287 if (!(mtd
->flags
& MTD_WRITEABLE
))
289 if (ofs
>= mtd
->size
)
292 res
= part
->master
->block_markbad(part
->master
, ofs
);
294 mtd
->ecc_stats
.badblocks
++;
299 * This function unregisters and destroy all slave MTD objects which are
300 * attached to the given master MTD object.
303 int del_mtd_partitions(struct mtd_info
*master
)
305 struct list_head
*node
;
306 struct mtd_part
*slave
;
308 for (node
= mtd_partitions
.next
;
309 node
!= &mtd_partitions
;
311 slave
= list_entry(node
, struct mtd_part
, list
);
312 if (slave
->master
== master
) {
313 struct list_head
*prev
= node
->prev
;
314 __list_del(prev
, node
->next
);
315 if(slave
->registered
)
316 del_mtd_device(&slave
->mtd
);
326 * This function, given a master MTD object and a partition table, creates
327 * and registers slave MTD objects which are bound to the master according to
328 * the partition definitions.
329 * (Q: should we register the master MTD object as well?)
332 int add_mtd_partitions(struct mtd_info
*master
,
333 const struct mtd_partition
*parts
,
336 struct mtd_part
*slave
;
337 u_int32_t cur_offset
= 0;
340 printk (KERN_NOTICE
"Creating %d MTD partitions on \"%s\":\n", nbparts
, master
->name
);
342 for (i
= 0; i
< nbparts
; i
++) {
344 /* allocate the partition structure */
345 slave
= kzalloc (sizeof(*slave
), GFP_KERNEL
);
347 printk ("memory allocation error while creating partitions for \"%s\"\n",
349 del_mtd_partitions(master
);
352 list_add(&slave
->list
, &mtd_partitions
);
354 /* set up the MTD object for this partition */
355 slave
->mtd
.type
= master
->type
;
356 slave
->mtd
.flags
= master
->flags
& ~parts
[i
].mask_flags
;
357 slave
->mtd
.size
= parts
[i
].size
;
358 slave
->mtd
.writesize
= master
->writesize
;
359 slave
->mtd
.oobsize
= master
->oobsize
;
360 slave
->mtd
.oobavail
= master
->oobavail
;
361 slave
->mtd
.subpage_sft
= master
->subpage_sft
;
363 slave
->mtd
.name
= parts
[i
].name
;
364 slave
->mtd
.owner
= master
->owner
;
366 slave
->mtd
.read
= part_read
;
367 slave
->mtd
.write
= part_write
;
369 if (master
->panic_write
)
370 slave
->mtd
.panic_write
= part_panic_write
;
372 if(master
->point
&& master
->unpoint
){
373 slave
->mtd
.point
= part_point
;
374 slave
->mtd
.unpoint
= part_unpoint
;
377 if (master
->read_oob
)
378 slave
->mtd
.read_oob
= part_read_oob
;
379 if (master
->write_oob
)
380 slave
->mtd
.write_oob
= part_write_oob
;
381 if(master
->read_user_prot_reg
)
382 slave
->mtd
.read_user_prot_reg
= part_read_user_prot_reg
;
383 if(master
->read_fact_prot_reg
)
384 slave
->mtd
.read_fact_prot_reg
= part_read_fact_prot_reg
;
385 if(master
->write_user_prot_reg
)
386 slave
->mtd
.write_user_prot_reg
= part_write_user_prot_reg
;
387 if(master
->lock_user_prot_reg
)
388 slave
->mtd
.lock_user_prot_reg
= part_lock_user_prot_reg
;
389 if(master
->get_user_prot_info
)
390 slave
->mtd
.get_user_prot_info
= part_get_user_prot_info
;
391 if(master
->get_fact_prot_info
)
392 slave
->mtd
.get_fact_prot_info
= part_get_fact_prot_info
;
394 slave
->mtd
.sync
= part_sync
;
395 if (!i
&& master
->suspend
&& master
->resume
) {
396 slave
->mtd
.suspend
= part_suspend
;
397 slave
->mtd
.resume
= part_resume
;
400 slave
->mtd
.writev
= part_writev
;
402 slave
->mtd
.lock
= part_lock
;
404 slave
->mtd
.unlock
= part_unlock
;
405 if (master
->block_isbad
)
406 slave
->mtd
.block_isbad
= part_block_isbad
;
407 if (master
->block_markbad
)
408 slave
->mtd
.block_markbad
= part_block_markbad
;
409 slave
->mtd
.erase
= part_erase
;
410 slave
->master
= master
;
411 slave
->offset
= parts
[i
].offset
;
414 if (slave
->offset
== MTDPART_OFS_APPEND
)
415 slave
->offset
= cur_offset
;
416 if (slave
->offset
== MTDPART_OFS_NXTBLK
) {
417 slave
->offset
= cur_offset
;
418 if ((cur_offset
% master
->erasesize
) != 0) {
419 /* Round up to next erasesize */
420 slave
->offset
= ((cur_offset
/ master
->erasesize
) + 1) * master
->erasesize
;
421 printk(KERN_NOTICE
"Moving partition %d: "
422 "0x%08x -> 0x%08x\n", i
,
423 cur_offset
, slave
->offset
);
426 if (slave
->mtd
.size
== MTDPART_SIZ_FULL
)
427 slave
->mtd
.size
= master
->size
- slave
->offset
;
428 cur_offset
= slave
->offset
+ slave
->mtd
.size
;
430 printk (KERN_NOTICE
"0x%08x-0x%08x : \"%s\"\n", slave
->offset
,
431 slave
->offset
+ slave
->mtd
.size
, slave
->mtd
.name
);
433 /* let's do some sanity checks */
434 if (slave
->offset
>= master
->size
) {
435 /* let's register it anyway to preserve ordering */
438 printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
441 if (slave
->offset
+ slave
->mtd
.size
> master
->size
) {
442 slave
->mtd
.size
= master
->size
- slave
->offset
;
443 printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
444 parts
[i
].name
, master
->name
, slave
->mtd
.size
);
446 if (master
->numeraseregions
>1) {
447 /* Deal with variable erase size stuff */
449 struct mtd_erase_region_info
*regions
= master
->eraseregions
;
451 /* Find the first erase regions which is part of this partition. */
452 for (i
=0; i
< master
->numeraseregions
&& slave
->offset
>= regions
[i
].offset
; i
++)
455 for (i
--; i
< master
->numeraseregions
&& slave
->offset
+ slave
->mtd
.size
> regions
[i
].offset
; i
++) {
456 if (slave
->mtd
.erasesize
< regions
[i
].erasesize
) {
457 slave
->mtd
.erasesize
= regions
[i
].erasesize
;
461 /* Single erase size */
462 slave
->mtd
.erasesize
= master
->erasesize
;
465 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
466 (slave
->offset
% slave
->mtd
.erasesize
)) {
467 /* Doesn't start on a boundary of major erase size */
468 /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
469 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
470 printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
473 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
474 (slave
->mtd
.size
% slave
->mtd
.erasesize
)) {
475 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
476 printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
480 slave
->mtd
.ecclayout
= master
->ecclayout
;
481 if (master
->block_isbad
) {
484 while(offs
< slave
->mtd
.size
) {
485 if (master
->block_isbad(master
,
486 offs
+ slave
->offset
))
487 slave
->mtd
.ecc_stats
.badblocks
++;
488 offs
+= slave
->mtd
.erasesize
;
493 { /* store the object pointer (caller may or may not register it */
494 *parts
[i
].mtdp
= &slave
->mtd
;
495 slave
->registered
= 0;
499 /* register our partition */
500 add_mtd_device(&slave
->mtd
);
501 slave
->registered
= 1;
508 EXPORT_SYMBOL(add_mtd_partitions
);
509 EXPORT_SYMBOL(del_mtd_partitions
);
511 static DEFINE_SPINLOCK(part_parser_lock
);
512 static LIST_HEAD(part_parsers
);
514 static struct mtd_part_parser
*get_partition_parser(const char *name
)
516 struct list_head
*this;
518 spin_lock(&part_parser_lock
);
520 list_for_each(this, &part_parsers
) {
521 struct mtd_part_parser
*p
= list_entry(this, struct mtd_part_parser
, list
);
523 if (!strcmp(p
->name
, name
) && try_module_get(p
->owner
)) {
528 spin_unlock(&part_parser_lock
);
533 int register_mtd_parser(struct mtd_part_parser
*p
)
535 spin_lock(&part_parser_lock
);
536 list_add(&p
->list
, &part_parsers
);
537 spin_unlock(&part_parser_lock
);
542 int deregister_mtd_parser(struct mtd_part_parser
*p
)
544 spin_lock(&part_parser_lock
);
546 spin_unlock(&part_parser_lock
);
550 int parse_mtd_partitions(struct mtd_info
*master
, const char **types
,
551 struct mtd_partition
**pparts
, unsigned long origin
)
553 struct mtd_part_parser
*parser
;
556 for ( ; ret
<= 0 && *types
; types
++) {
557 parser
= get_partition_parser(*types
);
559 if (!parser
&& !request_module("%s", *types
))
560 parser
= get_partition_parser(*types
);
563 printk(KERN_NOTICE
"%s partition parsing not available\n",
567 ret
= (*parser
->parse_fn
)(master
, pparts
, origin
);
569 printk(KERN_NOTICE
"%d %s partitions found on MTD device %s\n",
570 ret
, parser
->name
, master
->name
);
572 put_partition_parser(parser
);
577 EXPORT_SYMBOL_GPL(parse_mtd_partitions
);
578 EXPORT_SYMBOL_GPL(register_mtd_parser
);
579 EXPORT_SYMBOL_GPL(deregister_mtd_parser
);
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