]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/mtd/mtdpart.c
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
, u_char
**buf
)
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
,
82 static void part_unpoint (struct mtd_info
*mtd
, u_char
*addr
, loff_t from
, size_t len
)
84 struct mtd_part
*part
= PART(mtd
);
86 part
->master
->unpoint (part
->master
, addr
, 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_write_oob(struct mtd_info
*mtd
, loff_t to
,
155 struct mtd_oob_ops
*ops
)
157 struct mtd_part
*part
= PART(mtd
);
159 if (!(mtd
->flags
& MTD_WRITEABLE
))
164 if (ops
->datbuf
&& to
+ ops
->len
> mtd
->size
)
166 return part
->master
->write_oob(part
->master
, to
+ part
->offset
, ops
);
169 static int part_write_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
,
170 size_t *retlen
, u_char
*buf
)
172 struct mtd_part
*part
= PART(mtd
);
173 return part
->master
->write_user_prot_reg (part
->master
, from
,
177 static int part_lock_user_prot_reg (struct mtd_info
*mtd
, loff_t from
, size_t len
)
179 struct mtd_part
*part
= PART(mtd
);
180 return part
->master
->lock_user_prot_reg (part
->master
, from
, len
);
183 static int part_writev (struct mtd_info
*mtd
, const struct kvec
*vecs
,
184 unsigned long count
, loff_t to
, size_t *retlen
)
186 struct mtd_part
*part
= PART(mtd
);
187 if (!(mtd
->flags
& MTD_WRITEABLE
))
189 return part
->master
->writev (part
->master
, vecs
, count
,
190 to
+ part
->offset
, retlen
);
193 static int part_erase (struct mtd_info
*mtd
, struct erase_info
*instr
)
195 struct mtd_part
*part
= PART(mtd
);
197 if (!(mtd
->flags
& MTD_WRITEABLE
))
199 if (instr
->addr
>= mtd
->size
)
201 instr
->addr
+= part
->offset
;
202 ret
= part
->master
->erase(part
->master
, instr
);
206 void mtd_erase_callback(struct erase_info
*instr
)
208 if (instr
->mtd
->erase
== part_erase
) {
209 struct mtd_part
*part
= PART(instr
->mtd
);
211 if (instr
->fail_addr
!= 0xffffffff)
212 instr
->fail_addr
-= part
->offset
;
213 instr
->addr
-= part
->offset
;
216 instr
->callback(instr
);
218 EXPORT_SYMBOL_GPL(mtd_erase_callback
);
220 static int part_lock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
222 struct mtd_part
*part
= PART(mtd
);
223 if ((len
+ ofs
) > mtd
->size
)
225 return part
->master
->lock(part
->master
, ofs
+ part
->offset
, len
);
228 static int part_unlock (struct mtd_info
*mtd
, loff_t ofs
, size_t len
)
230 struct mtd_part
*part
= PART(mtd
);
231 if ((len
+ ofs
) > mtd
->size
)
233 return part
->master
->unlock(part
->master
, ofs
+ part
->offset
, len
);
236 static void part_sync(struct mtd_info
*mtd
)
238 struct mtd_part
*part
= PART(mtd
);
239 part
->master
->sync(part
->master
);
242 static int part_suspend(struct mtd_info
*mtd
)
244 struct mtd_part
*part
= PART(mtd
);
245 return part
->master
->suspend(part
->master
);
248 static void part_resume(struct mtd_info
*mtd
)
250 struct mtd_part
*part
= PART(mtd
);
251 part
->master
->resume(part
->master
);
254 static int part_block_isbad (struct mtd_info
*mtd
, loff_t ofs
)
256 struct mtd_part
*part
= PART(mtd
);
257 if (ofs
>= mtd
->size
)
260 return part
->master
->block_isbad(part
->master
, ofs
);
263 static int part_block_markbad (struct mtd_info
*mtd
, loff_t ofs
)
265 struct mtd_part
*part
= PART(mtd
);
268 if (!(mtd
->flags
& MTD_WRITEABLE
))
270 if (ofs
>= mtd
->size
)
273 res
= part
->master
->block_markbad(part
->master
, ofs
);
275 mtd
->ecc_stats
.badblocks
++;
280 * This function unregisters and destroy all slave MTD objects which are
281 * attached to the given master MTD object.
284 int del_mtd_partitions(struct mtd_info
*master
)
286 struct list_head
*node
;
287 struct mtd_part
*slave
;
289 for (node
= mtd_partitions
.next
;
290 node
!= &mtd_partitions
;
292 slave
= list_entry(node
, struct mtd_part
, list
);
293 if (slave
->master
== master
) {
294 struct list_head
*prev
= node
->prev
;
295 __list_del(prev
, node
->next
);
296 if(slave
->registered
)
297 del_mtd_device(&slave
->mtd
);
307 * This function, given a master MTD object and a partition table, creates
308 * and registers slave MTD objects which are bound to the master according to
309 * the partition definitions.
310 * (Q: should we register the master MTD object as well?)
313 int add_mtd_partitions(struct mtd_info
*master
,
314 const struct mtd_partition
*parts
,
317 struct mtd_part
*slave
;
318 u_int32_t cur_offset
= 0;
321 printk (KERN_NOTICE
"Creating %d MTD partitions on \"%s\":\n", nbparts
, master
->name
);
323 for (i
= 0; i
< nbparts
; i
++) {
325 /* allocate the partition structure */
326 slave
= kzalloc (sizeof(*slave
), GFP_KERNEL
);
328 printk ("memory allocation error while creating partitions for \"%s\"\n",
330 del_mtd_partitions(master
);
333 list_add(&slave
->list
, &mtd_partitions
);
335 /* set up the MTD object for this partition */
336 slave
->mtd
.type
= master
->type
;
337 slave
->mtd
.flags
= master
->flags
& ~parts
[i
].mask_flags
;
338 slave
->mtd
.size
= parts
[i
].size
;
339 slave
->mtd
.writesize
= master
->writesize
;
340 slave
->mtd
.oobsize
= master
->oobsize
;
341 slave
->mtd
.oobavail
= master
->oobavail
;
342 slave
->mtd
.subpage_sft
= master
->subpage_sft
;
344 slave
->mtd
.name
= parts
[i
].name
;
345 slave
->mtd
.bank_size
= master
->bank_size
;
346 slave
->mtd
.owner
= master
->owner
;
348 slave
->mtd
.read
= part_read
;
349 slave
->mtd
.write
= part_write
;
351 if(master
->point
&& master
->unpoint
){
352 slave
->mtd
.point
= part_point
;
353 slave
->mtd
.unpoint
= part_unpoint
;
356 if (master
->read_oob
)
357 slave
->mtd
.read_oob
= part_read_oob
;
358 if (master
->write_oob
)
359 slave
->mtd
.write_oob
= part_write_oob
;
360 if(master
->read_user_prot_reg
)
361 slave
->mtd
.read_user_prot_reg
= part_read_user_prot_reg
;
362 if(master
->read_fact_prot_reg
)
363 slave
->mtd
.read_fact_prot_reg
= part_read_fact_prot_reg
;
364 if(master
->write_user_prot_reg
)
365 slave
->mtd
.write_user_prot_reg
= part_write_user_prot_reg
;
366 if(master
->lock_user_prot_reg
)
367 slave
->mtd
.lock_user_prot_reg
= part_lock_user_prot_reg
;
368 if(master
->get_user_prot_info
)
369 slave
->mtd
.get_user_prot_info
= part_get_user_prot_info
;
370 if(master
->get_fact_prot_info
)
371 slave
->mtd
.get_fact_prot_info
= part_get_fact_prot_info
;
373 slave
->mtd
.sync
= part_sync
;
374 if (!i
&& master
->suspend
&& master
->resume
) {
375 slave
->mtd
.suspend
= part_suspend
;
376 slave
->mtd
.resume
= part_resume
;
379 slave
->mtd
.writev
= part_writev
;
381 slave
->mtd
.lock
= part_lock
;
383 slave
->mtd
.unlock
= part_unlock
;
384 if (master
->block_isbad
)
385 slave
->mtd
.block_isbad
= part_block_isbad
;
386 if (master
->block_markbad
)
387 slave
->mtd
.block_markbad
= part_block_markbad
;
388 slave
->mtd
.erase
= part_erase
;
389 slave
->master
= master
;
390 slave
->offset
= parts
[i
].offset
;
393 if (slave
->offset
== MTDPART_OFS_APPEND
)
394 slave
->offset
= cur_offset
;
395 if (slave
->offset
== MTDPART_OFS_NXTBLK
) {
396 slave
->offset
= cur_offset
;
397 if ((cur_offset
% master
->erasesize
) != 0) {
398 /* Round up to next erasesize */
399 slave
->offset
= ((cur_offset
/ master
->erasesize
) + 1) * master
->erasesize
;
400 printk(KERN_NOTICE
"Moving partition %d: "
401 "0x%08x -> 0x%08x\n", i
,
402 cur_offset
, slave
->offset
);
405 if (slave
->mtd
.size
== MTDPART_SIZ_FULL
)
406 slave
->mtd
.size
= master
->size
- slave
->offset
;
407 cur_offset
= slave
->offset
+ slave
->mtd
.size
;
409 printk (KERN_NOTICE
"0x%08x-0x%08x : \"%s\"\n", slave
->offset
,
410 slave
->offset
+ slave
->mtd
.size
, slave
->mtd
.name
);
412 /* let's do some sanity checks */
413 if (slave
->offset
>= master
->size
) {
414 /* let's register it anyway to preserve ordering */
417 printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
420 if (slave
->offset
+ slave
->mtd
.size
> master
->size
) {
421 slave
->mtd
.size
= master
->size
- slave
->offset
;
422 printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
423 parts
[i
].name
, master
->name
, slave
->mtd
.size
);
425 if (master
->numeraseregions
>1) {
426 /* Deal with variable erase size stuff */
428 struct mtd_erase_region_info
*regions
= master
->eraseregions
;
430 /* Find the first erase regions which is part of this partition. */
431 for (i
=0; i
< master
->numeraseregions
&& slave
->offset
>= regions
[i
].offset
; i
++)
434 for (i
--; i
< master
->numeraseregions
&& slave
->offset
+ slave
->mtd
.size
> regions
[i
].offset
; i
++) {
435 if (slave
->mtd
.erasesize
< regions
[i
].erasesize
) {
436 slave
->mtd
.erasesize
= regions
[i
].erasesize
;
440 /* Single erase size */
441 slave
->mtd
.erasesize
= master
->erasesize
;
444 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
445 (slave
->offset
% slave
->mtd
.erasesize
)) {
446 /* Doesn't start on a boundary of major erase size */
447 /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
448 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
449 printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
452 if ((slave
->mtd
.flags
& MTD_WRITEABLE
) &&
453 (slave
->mtd
.size
% slave
->mtd
.erasesize
)) {
454 slave
->mtd
.flags
&= ~MTD_WRITEABLE
;
455 printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
459 slave
->mtd
.ecclayout
= master
->ecclayout
;
460 if (master
->block_isbad
) {
463 while(offs
< slave
->mtd
.size
) {
464 if (master
->block_isbad(master
,
465 offs
+ slave
->offset
))
466 slave
->mtd
.ecc_stats
.badblocks
++;
467 offs
+= slave
->mtd
.erasesize
;
472 { /* store the object pointer (caller may or may not register it */
473 *parts
[i
].mtdp
= &slave
->mtd
;
474 slave
->registered
= 0;
478 /* register our partition */
479 add_mtd_device(&slave
->mtd
);
480 slave
->registered
= 1;
487 EXPORT_SYMBOL(add_mtd_partitions
);
488 EXPORT_SYMBOL(del_mtd_partitions
);
490 static DEFINE_SPINLOCK(part_parser_lock
);
491 static LIST_HEAD(part_parsers
);
493 static struct mtd_part_parser
*get_partition_parser(const char *name
)
495 struct list_head
*this;
497 spin_lock(&part_parser_lock
);
499 list_for_each(this, &part_parsers
) {
500 struct mtd_part_parser
*p
= list_entry(this, struct mtd_part_parser
, list
);
502 if (!strcmp(p
->name
, name
) && try_module_get(p
->owner
)) {
507 spin_unlock(&part_parser_lock
);
512 int register_mtd_parser(struct mtd_part_parser
*p
)
514 spin_lock(&part_parser_lock
);
515 list_add(&p
->list
, &part_parsers
);
516 spin_unlock(&part_parser_lock
);
521 int deregister_mtd_parser(struct mtd_part_parser
*p
)
523 spin_lock(&part_parser_lock
);
525 spin_unlock(&part_parser_lock
);
529 int parse_mtd_partitions(struct mtd_info
*master
, const char **types
,
530 struct mtd_partition
**pparts
, unsigned long origin
)
532 struct mtd_part_parser
*parser
;
535 for ( ; ret
<= 0 && *types
; types
++) {
536 parser
= get_partition_parser(*types
);
538 if (!parser
&& !request_module("%s", *types
))
539 parser
= get_partition_parser(*types
);
542 printk(KERN_NOTICE
"%s partition parsing not available\n",
546 ret
= (*parser
->parse_fn
)(master
, pparts
, origin
);
548 printk(KERN_NOTICE
"%d %s partitions found on MTD device %s\n",
549 ret
, parser
->name
, master
->name
);
551 put_partition_parser(parser
);
556 EXPORT_SYMBOL_GPL(parse_mtd_partitions
);
557 EXPORT_SYMBOL_GPL(register_mtd_parser
);
558 EXPORT_SYMBOL_GPL(deregister_mtd_parser
);
560 MODULE_LICENSE("GPL");
561 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
562 MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");