2 * MTD device concatenation layer
4 * (C) 2002 Robert Kaiser <rkaiser@sysgo.de>
6 * NAND support by Christian Gan <cgan@iders.ca>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/sched.h>
15 #include <linux/types.h>
16 #include <linux/backing-dev.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/concat.h>
21 #include <asm/div64.h>
24 * Our storage structure:
25 * Subdev points to an array of pointers to struct mtd_info objects
26 * which is allocated along with this structure
32 struct mtd_info
**subdev
;
36 * how to calculate the size required for the above structure,
37 * including the pointer array subdev points to:
39 #define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \
40 ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *)))
43 * Given a pointer to the MTD object in the mtd_concat structure,
44 * we can retrieve the pointer to that structure with this macro.
46 #define CONCAT(x) ((struct mtd_concat *)(x))
49 * MTD methods which look up the relevant subdevice, translate the
50 * effective address and pass through to the subdevice.
54 concat_read(struct mtd_info
*mtd
, loff_t from
, size_t len
,
55 size_t * retlen
, u_char
* buf
)
57 struct mtd_concat
*concat
= CONCAT(mtd
);
63 for (i
= 0; i
< concat
->num_subdev
; i
++) {
64 struct mtd_info
*subdev
= concat
->subdev
[i
];
67 if (from
>= subdev
->size
) {
68 /* Not destined for this subdev */
73 if (from
+ len
> subdev
->size
)
74 /* First part goes into this subdev */
75 size
= subdev
->size
- from
;
77 /* Entire transaction goes into this subdev */
80 err
= subdev
->read(subdev
, from
, size
, &retsize
, buf
);
82 /* Save information about bitflips! */
84 if (err
== -EBADMSG
) {
85 mtd
->ecc_stats
.failed
++;
87 } else if (err
== -EUCLEAN
) {
88 mtd
->ecc_stats
.corrected
++;
89 /* Do not overwrite -EBADMSG !! */
108 concat_write(struct mtd_info
*mtd
, loff_t to
, size_t len
,
109 size_t * retlen
, const u_char
* buf
)
111 struct mtd_concat
*concat
= CONCAT(mtd
);
115 if (!(mtd
->flags
& MTD_WRITEABLE
))
120 for (i
= 0; i
< concat
->num_subdev
; i
++) {
121 struct mtd_info
*subdev
= concat
->subdev
[i
];
122 size_t size
, retsize
;
124 if (to
>= subdev
->size
) {
129 if (to
+ len
> subdev
->size
)
130 size
= subdev
->size
- to
;
134 if (!(subdev
->flags
& MTD_WRITEABLE
))
137 err
= subdev
->write(subdev
, to
, size
, &retsize
, buf
);
155 concat_writev(struct mtd_info
*mtd
, const struct kvec
*vecs
,
156 unsigned long count
, loff_t to
, size_t * retlen
)
158 struct mtd_concat
*concat
= CONCAT(mtd
);
159 struct kvec
*vecs_copy
;
160 unsigned long entry_low
, entry_high
;
161 size_t total_len
= 0;
165 if (!(mtd
->flags
& MTD_WRITEABLE
))
170 /* Calculate total length of data */
171 for (i
= 0; i
< count
; i
++)
172 total_len
+= vecs
[i
].iov_len
;
174 /* Do not allow write past end of device */
175 if ((to
+ total_len
) > mtd
->size
)
178 /* Check alignment */
179 if (mtd
->writesize
> 1) {
181 if (do_div(__to
, mtd
->writesize
) || (total_len
% mtd
->writesize
))
185 /* make a copy of vecs */
186 vecs_copy
= kmalloc(sizeof(struct kvec
) * count
, GFP_KERNEL
);
189 memcpy(vecs_copy
, vecs
, sizeof(struct kvec
) * count
);
192 for (i
= 0; i
< concat
->num_subdev
; i
++) {
193 struct mtd_info
*subdev
= concat
->subdev
[i
];
194 size_t size
, wsize
, retsize
, old_iov_len
;
196 if (to
>= subdev
->size
) {
201 size
= min_t(uint64_t, total_len
, subdev
->size
- to
);
202 wsize
= size
; /* store for future use */
204 entry_high
= entry_low
;
205 while (entry_high
< count
) {
206 if (size
<= vecs_copy
[entry_high
].iov_len
)
208 size
-= vecs_copy
[entry_high
++].iov_len
;
211 old_iov_len
= vecs_copy
[entry_high
].iov_len
;
212 vecs_copy
[entry_high
].iov_len
= size
;
214 if (!(subdev
->flags
& MTD_WRITEABLE
))
217 err
= subdev
->writev(subdev
, &vecs_copy
[entry_low
],
218 entry_high
- entry_low
+ 1, to
, &retsize
);
220 vecs_copy
[entry_high
].iov_len
= old_iov_len
- size
;
221 vecs_copy
[entry_high
].iov_base
+= size
;
223 entry_low
= entry_high
;
243 concat_read_oob(struct mtd_info
*mtd
, loff_t from
, struct mtd_oob_ops
*ops
)
245 struct mtd_concat
*concat
= CONCAT(mtd
);
246 struct mtd_oob_ops devops
= *ops
;
249 ops
->retlen
= ops
->oobretlen
= 0;
251 for (i
= 0; i
< concat
->num_subdev
; i
++) {
252 struct mtd_info
*subdev
= concat
->subdev
[i
];
254 if (from
>= subdev
->size
) {
255 from
-= subdev
->size
;
260 if (from
+ devops
.len
> subdev
->size
)
261 devops
.len
= subdev
->size
- from
;
263 err
= subdev
->read_oob(subdev
, from
, &devops
);
264 ops
->retlen
+= devops
.retlen
;
265 ops
->oobretlen
+= devops
.oobretlen
;
267 /* Save information about bitflips! */
269 if (err
== -EBADMSG
) {
270 mtd
->ecc_stats
.failed
++;
272 } else if (err
== -EUCLEAN
) {
273 mtd
->ecc_stats
.corrected
++;
274 /* Do not overwrite -EBADMSG !! */
282 devops
.len
= ops
->len
- ops
->retlen
;
285 devops
.datbuf
+= devops
.retlen
;
288 devops
.ooblen
= ops
->ooblen
- ops
->oobretlen
;
291 devops
.oobbuf
+= ops
->oobretlen
;
300 concat_write_oob(struct mtd_info
*mtd
, loff_t to
, struct mtd_oob_ops
*ops
)
302 struct mtd_concat
*concat
= CONCAT(mtd
);
303 struct mtd_oob_ops devops
= *ops
;
306 if (!(mtd
->flags
& MTD_WRITEABLE
))
311 for (i
= 0; i
< concat
->num_subdev
; i
++) {
312 struct mtd_info
*subdev
= concat
->subdev
[i
];
314 if (to
>= subdev
->size
) {
319 /* partial write ? */
320 if (to
+ devops
.len
> subdev
->size
)
321 devops
.len
= subdev
->size
- to
;
323 err
= subdev
->write_oob(subdev
, to
, &devops
);
324 ops
->retlen
+= devops
.retlen
;
329 devops
.len
= ops
->len
- ops
->retlen
;
332 devops
.datbuf
+= devops
.retlen
;
335 devops
.ooblen
= ops
->ooblen
- ops
->oobretlen
;
338 devops
.oobbuf
+= devops
.oobretlen
;
345 static void concat_erase_callback(struct erase_info
*instr
)
347 wake_up((wait_queue_head_t
*) instr
->priv
);
350 static int concat_dev_erase(struct mtd_info
*mtd
, struct erase_info
*erase
)
353 wait_queue_head_t waitq
;
354 DECLARE_WAITQUEUE(wait
, current
);
357 * This code was stol^H^H^H^Hinspired by mtdchar.c
359 init_waitqueue_head(&waitq
);
362 erase
->callback
= concat_erase_callback
;
363 erase
->priv
= (unsigned long) &waitq
;
366 * FIXME: Allow INTERRUPTIBLE. Which means
367 * not having the wait_queue head on the stack.
369 err
= mtd
->erase(mtd
, erase
);
371 set_current_state(TASK_UNINTERRUPTIBLE
);
372 add_wait_queue(&waitq
, &wait
);
373 if (erase
->state
!= MTD_ERASE_DONE
374 && erase
->state
!= MTD_ERASE_FAILED
)
376 remove_wait_queue(&waitq
, &wait
);
377 set_current_state(TASK_RUNNING
);
379 err
= (erase
->state
== MTD_ERASE_FAILED
) ? -EIO
: 0;
384 static int concat_erase(struct mtd_info
*mtd
, struct erase_info
*instr
)
386 struct mtd_concat
*concat
= CONCAT(mtd
);
387 struct mtd_info
*subdev
;
389 uint64_t length
, offset
= 0;
390 struct erase_info
*erase
;
392 if (!(mtd
->flags
& MTD_WRITEABLE
))
395 if (instr
->addr
> concat
->mtd
.size
)
398 if (instr
->len
+ instr
->addr
> concat
->mtd
.size
)
402 * Check for proper erase block alignment of the to-be-erased area.
403 * It is easier to do this based on the super device's erase
404 * region info rather than looking at each particular sub-device
407 if (!concat
->mtd
.numeraseregions
) {
408 /* the easy case: device has uniform erase block size */
409 if (instr
->addr
& (concat
->mtd
.erasesize
- 1))
411 if (instr
->len
& (concat
->mtd
.erasesize
- 1))
414 /* device has variable erase size */
415 struct mtd_erase_region_info
*erase_regions
=
416 concat
->mtd
.eraseregions
;
419 * Find the erase region where the to-be-erased area begins:
421 for (i
= 0; i
< concat
->mtd
.numeraseregions
&&
422 instr
->addr
>= erase_regions
[i
].offset
; i
++) ;
426 * Now erase_regions[i] is the region in which the
427 * to-be-erased area begins. Verify that the starting
428 * offset is aligned to this region's erase size:
430 if (i
< 0 || instr
->addr
& (erase_regions
[i
].erasesize
- 1))
434 * now find the erase region where the to-be-erased area ends:
436 for (; i
< concat
->mtd
.numeraseregions
&&
437 (instr
->addr
+ instr
->len
) >= erase_regions
[i
].offset
;
441 * check if the ending offset is aligned to this region's erase size
443 if (i
< 0 || ((instr
->addr
+ instr
->len
) &
444 (erase_regions
[i
].erasesize
- 1)))
448 instr
->fail_addr
= MTD_FAIL_ADDR_UNKNOWN
;
450 /* make a local copy of instr to avoid modifying the caller's struct */
451 erase
= kmalloc(sizeof (struct erase_info
), GFP_KERNEL
);
460 * find the subdevice where the to-be-erased area begins, adjust
461 * starting offset to be relative to the subdevice start
463 for (i
= 0; i
< concat
->num_subdev
; i
++) {
464 subdev
= concat
->subdev
[i
];
465 if (subdev
->size
<= erase
->addr
) {
466 erase
->addr
-= subdev
->size
;
467 offset
+= subdev
->size
;
473 /* must never happen since size limit has been verified above */
474 BUG_ON(i
>= concat
->num_subdev
);
476 /* now do the erase: */
478 for (; length
> 0; i
++) {
479 /* loop for all subdevices affected by this request */
480 subdev
= concat
->subdev
[i
]; /* get current subdevice */
482 /* limit length to subdevice's size: */
483 if (erase
->addr
+ length
> subdev
->size
)
484 erase
->len
= subdev
->size
- erase
->addr
;
488 if (!(subdev
->flags
& MTD_WRITEABLE
)) {
492 length
-= erase
->len
;
493 if ((err
= concat_dev_erase(subdev
, erase
))) {
494 /* sanity check: should never happen since
495 * block alignment has been checked above */
496 BUG_ON(err
== -EINVAL
);
497 if (erase
->fail_addr
!= MTD_FAIL_ADDR_UNKNOWN
)
498 instr
->fail_addr
= erase
->fail_addr
+ offset
;
502 * erase->addr specifies the offset of the area to be
503 * erased *within the current subdevice*. It can be
504 * non-zero only the first time through this loop, i.e.
505 * for the first subdevice where blocks need to be erased.
506 * All the following erases must begin at the start of the
507 * current subdevice, i.e. at offset zero.
510 offset
+= subdev
->size
;
512 instr
->state
= erase
->state
;
518 instr
->callback(instr
);
522 static int concat_lock(struct mtd_info
*mtd
, loff_t ofs
, uint64_t len
)
524 struct mtd_concat
*concat
= CONCAT(mtd
);
525 int i
, err
= -EINVAL
;
527 if ((len
+ ofs
) > mtd
->size
)
530 for (i
= 0; i
< concat
->num_subdev
; i
++) {
531 struct mtd_info
*subdev
= concat
->subdev
[i
];
534 if (ofs
>= subdev
->size
) {
539 if (ofs
+ len
> subdev
->size
)
540 size
= subdev
->size
- ofs
;
544 err
= subdev
->lock(subdev
, ofs
, size
);
560 static int concat_unlock(struct mtd_info
*mtd
, loff_t ofs
, uint64_t len
)
562 struct mtd_concat
*concat
= CONCAT(mtd
);
565 if ((len
+ ofs
) > mtd
->size
)
568 for (i
= 0; i
< concat
->num_subdev
; i
++) {
569 struct mtd_info
*subdev
= concat
->subdev
[i
];
572 if (ofs
>= subdev
->size
) {
577 if (ofs
+ len
> subdev
->size
)
578 size
= subdev
->size
- ofs
;
582 err
= subdev
->unlock(subdev
, ofs
, size
);
598 static void concat_sync(struct mtd_info
*mtd
)
600 struct mtd_concat
*concat
= CONCAT(mtd
);
603 for (i
= 0; i
< concat
->num_subdev
; i
++) {
604 struct mtd_info
*subdev
= concat
->subdev
[i
];
605 subdev
->sync(subdev
);
609 static int concat_suspend(struct mtd_info
*mtd
)
611 struct mtd_concat
*concat
= CONCAT(mtd
);
614 for (i
= 0; i
< concat
->num_subdev
; i
++) {
615 struct mtd_info
*subdev
= concat
->subdev
[i
];
616 if ((rc
= subdev
->suspend(subdev
)) < 0)
622 static void concat_resume(struct mtd_info
*mtd
)
624 struct mtd_concat
*concat
= CONCAT(mtd
);
627 for (i
= 0; i
< concat
->num_subdev
; i
++) {
628 struct mtd_info
*subdev
= concat
->subdev
[i
];
629 subdev
->resume(subdev
);
633 static int concat_block_isbad(struct mtd_info
*mtd
, loff_t ofs
)
635 struct mtd_concat
*concat
= CONCAT(mtd
);
638 if (!concat
->subdev
[0]->block_isbad
)
644 for (i
= 0; i
< concat
->num_subdev
; i
++) {
645 struct mtd_info
*subdev
= concat
->subdev
[i
];
647 if (ofs
>= subdev
->size
) {
652 res
= subdev
->block_isbad(subdev
, ofs
);
659 static int concat_block_markbad(struct mtd_info
*mtd
, loff_t ofs
)
661 struct mtd_concat
*concat
= CONCAT(mtd
);
662 int i
, err
= -EINVAL
;
664 if (!concat
->subdev
[0]->block_markbad
)
670 for (i
= 0; i
< concat
->num_subdev
; i
++) {
671 struct mtd_info
*subdev
= concat
->subdev
[i
];
673 if (ofs
>= subdev
->size
) {
678 err
= subdev
->block_markbad(subdev
, ofs
);
680 mtd
->ecc_stats
.badblocks
++;
688 * try to support NOMMU mmaps on concatenated devices
689 * - we don't support subdev spanning as we can't guarantee it'll work
691 static unsigned long concat_get_unmapped_area(struct mtd_info
*mtd
,
693 unsigned long offset
,
696 struct mtd_concat
*concat
= CONCAT(mtd
);
699 for (i
= 0; i
< concat
->num_subdev
; i
++) {
700 struct mtd_info
*subdev
= concat
->subdev
[i
];
702 if (offset
>= subdev
->size
) {
703 offset
-= subdev
->size
;
707 /* we've found the subdev over which the mapping will reside */
708 if (offset
+ len
> subdev
->size
)
709 return (unsigned long) -EINVAL
;
711 if (subdev
->get_unmapped_area
)
712 return subdev
->get_unmapped_area(subdev
, len
, offset
,
718 return (unsigned long) -ENOSYS
;
722 * This function constructs a virtual MTD device by concatenating
723 * num_devs MTD devices. A pointer to the new device object is
724 * stored to *new_dev upon success. This function does _not_
725 * register any devices: this is the caller's responsibility.
727 struct mtd_info
*mtd_concat_create(struct mtd_info
*subdev
[], /* subdevices to concatenate */
728 int num_devs
, /* number of subdevices */
730 { /* name for the new device */
733 struct mtd_concat
*concat
;
734 uint32_t max_erasesize
, curr_erasesize
;
735 int num_erase_region
;
737 printk(KERN_NOTICE
"Concatenating MTD devices:\n");
738 for (i
= 0; i
< num_devs
; i
++)
739 printk(KERN_NOTICE
"(%d): \"%s\"\n", i
, subdev
[i
]->name
);
740 printk(KERN_NOTICE
"into device \"%s\"\n", name
);
742 /* allocate the device structure */
743 size
= SIZEOF_STRUCT_MTD_CONCAT(num_devs
);
744 concat
= kzalloc(size
, GFP_KERNEL
);
747 ("memory allocation error while creating concatenated device \"%s\"\n",
751 concat
->subdev
= (struct mtd_info
**) (concat
+ 1);
754 * Set up the new "super" device's MTD object structure, check for
755 * incompatibilites between the subdevices.
757 concat
->mtd
.type
= subdev
[0]->type
;
758 concat
->mtd
.flags
= subdev
[0]->flags
;
759 concat
->mtd
.size
= subdev
[0]->size
;
760 concat
->mtd
.erasesize
= subdev
[0]->erasesize
;
761 concat
->mtd
.writesize
= subdev
[0]->writesize
;
762 concat
->mtd
.subpage_sft
= subdev
[0]->subpage_sft
;
763 concat
->mtd
.oobsize
= subdev
[0]->oobsize
;
764 concat
->mtd
.oobavail
= subdev
[0]->oobavail
;
765 if (subdev
[0]->writev
)
766 concat
->mtd
.writev
= concat_writev
;
767 if (subdev
[0]->read_oob
)
768 concat
->mtd
.read_oob
= concat_read_oob
;
769 if (subdev
[0]->write_oob
)
770 concat
->mtd
.write_oob
= concat_write_oob
;
771 if (subdev
[0]->block_isbad
)
772 concat
->mtd
.block_isbad
= concat_block_isbad
;
773 if (subdev
[0]->block_markbad
)
774 concat
->mtd
.block_markbad
= concat_block_markbad
;
776 concat
->mtd
.ecc_stats
.badblocks
= subdev
[0]->ecc_stats
.badblocks
;
778 concat
->mtd
.backing_dev_info
= subdev
[0]->backing_dev_info
;
780 concat
->subdev
[0] = subdev
[0];
782 for (i
= 1; i
< num_devs
; i
++) {
783 if (concat
->mtd
.type
!= subdev
[i
]->type
) {
785 printk("Incompatible device type on \"%s\"\n",
789 if (concat
->mtd
.flags
!= subdev
[i
]->flags
) {
791 * Expect all flags except MTD_WRITEABLE to be
792 * equal on all subdevices.
794 if ((concat
->mtd
.flags
^ subdev
[i
]->
795 flags
) & ~MTD_WRITEABLE
) {
797 printk("Incompatible device flags on \"%s\"\n",
801 /* if writeable attribute differs,
802 make super device writeable */
804 subdev
[i
]->flags
& MTD_WRITEABLE
;
807 /* only permit direct mapping if the BDIs are all the same
808 * - copy-mapping is still permitted
810 if (concat
->mtd
.backing_dev_info
!=
811 subdev
[i
]->backing_dev_info
)
812 concat
->mtd
.backing_dev_info
=
813 &default_backing_dev_info
;
815 concat
->mtd
.size
+= subdev
[i
]->size
;
816 concat
->mtd
.ecc_stats
.badblocks
+=
817 subdev
[i
]->ecc_stats
.badblocks
;
818 if (concat
->mtd
.writesize
!= subdev
[i
]->writesize
||
819 concat
->mtd
.subpage_sft
!= subdev
[i
]->subpage_sft
||
820 concat
->mtd
.oobsize
!= subdev
[i
]->oobsize
||
821 !concat
->mtd
.read_oob
!= !subdev
[i
]->read_oob
||
822 !concat
->mtd
.write_oob
!= !subdev
[i
]->write_oob
) {
824 printk("Incompatible OOB or ECC data on \"%s\"\n",
828 concat
->subdev
[i
] = subdev
[i
];
832 concat
->mtd
.ecclayout
= subdev
[0]->ecclayout
;
834 concat
->num_subdev
= num_devs
;
835 concat
->mtd
.name
= name
;
837 concat
->mtd
.erase
= concat_erase
;
838 concat
->mtd
.read
= concat_read
;
839 concat
->mtd
.write
= concat_write
;
840 concat
->mtd
.sync
= concat_sync
;
841 concat
->mtd
.lock
= concat_lock
;
842 concat
->mtd
.unlock
= concat_unlock
;
843 concat
->mtd
.suspend
= concat_suspend
;
844 concat
->mtd
.resume
= concat_resume
;
845 concat
->mtd
.get_unmapped_area
= concat_get_unmapped_area
;
848 * Combine the erase block size info of the subdevices:
850 * first, walk the map of the new device and see how
851 * many changes in erase size we have
853 max_erasesize
= curr_erasesize
= subdev
[0]->erasesize
;
854 num_erase_region
= 1;
855 for (i
= 0; i
< num_devs
; i
++) {
856 if (subdev
[i
]->numeraseregions
== 0) {
857 /* current subdevice has uniform erase size */
858 if (subdev
[i
]->erasesize
!= curr_erasesize
) {
859 /* if it differs from the last subdevice's erase size, count it */
861 curr_erasesize
= subdev
[i
]->erasesize
;
862 if (curr_erasesize
> max_erasesize
)
863 max_erasesize
= curr_erasesize
;
866 /* current subdevice has variable erase size */
868 for (j
= 0; j
< subdev
[i
]->numeraseregions
; j
++) {
870 /* walk the list of erase regions, count any changes */
871 if (subdev
[i
]->eraseregions
[j
].erasesize
!=
875 subdev
[i
]->eraseregions
[j
].
877 if (curr_erasesize
> max_erasesize
)
878 max_erasesize
= curr_erasesize
;
884 if (num_erase_region
== 1) {
886 * All subdevices have the same uniform erase size.
889 concat
->mtd
.erasesize
= curr_erasesize
;
890 concat
->mtd
.numeraseregions
= 0;
895 * erase block size varies across the subdevices: allocate
896 * space to store the data describing the variable erase regions
898 struct mtd_erase_region_info
*erase_region_p
;
899 uint64_t begin
, position
;
901 concat
->mtd
.erasesize
= max_erasesize
;
902 concat
->mtd
.numeraseregions
= num_erase_region
;
903 concat
->mtd
.eraseregions
= erase_region_p
=
904 kmalloc(num_erase_region
*
905 sizeof (struct mtd_erase_region_info
), GFP_KERNEL
);
906 if (!erase_region_p
) {
909 ("memory allocation error while creating erase region list"
910 " for device \"%s\"\n", name
);
915 * walk the map of the new device once more and fill in
916 * in erase region info:
918 curr_erasesize
= subdev
[0]->erasesize
;
919 begin
= position
= 0;
920 for (i
= 0; i
< num_devs
; i
++) {
921 if (subdev
[i
]->numeraseregions
== 0) {
922 /* current subdevice has uniform erase size */
923 if (subdev
[i
]->erasesize
!= curr_erasesize
) {
925 * fill in an mtd_erase_region_info structure for the area
926 * we have walked so far:
928 erase_region_p
->offset
= begin
;
929 erase_region_p
->erasesize
=
931 tmp64
= position
- begin
;
932 do_div(tmp64
, curr_erasesize
);
933 erase_region_p
->numblocks
= tmp64
;
936 curr_erasesize
= subdev
[i
]->erasesize
;
939 position
+= subdev
[i
]->size
;
941 /* current subdevice has variable erase size */
943 for (j
= 0; j
< subdev
[i
]->numeraseregions
; j
++) {
944 /* walk the list of erase regions, count any changes */
945 if (subdev
[i
]->eraseregions
[j
].
946 erasesize
!= curr_erasesize
) {
947 erase_region_p
->offset
= begin
;
948 erase_region_p
->erasesize
=
950 tmp64
= position
- begin
;
951 do_div(tmp64
, curr_erasesize
);
952 erase_region_p
->numblocks
= tmp64
;
956 subdev
[i
]->eraseregions
[j
].
961 subdev
[i
]->eraseregions
[j
].
962 numblocks
* (uint64_t)curr_erasesize
;
966 /* Now write the final entry */
967 erase_region_p
->offset
= begin
;
968 erase_region_p
->erasesize
= curr_erasesize
;
969 tmp64
= position
- begin
;
970 do_div(tmp64
, curr_erasesize
);
971 erase_region_p
->numblocks
= tmp64
;
978 * This function destroys an MTD object obtained from concat_mtd_devs()
981 void mtd_concat_destroy(struct mtd_info
*mtd
)
983 struct mtd_concat
*concat
= CONCAT(mtd
);
984 if (concat
->mtd
.numeraseregions
)
985 kfree(concat
->mtd
.eraseregions
);
989 EXPORT_SYMBOL(mtd_concat_create
);
990 EXPORT_SYMBOL(mtd_concat_destroy
);
992 MODULE_LICENSE("GPL");
993 MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>");
994 MODULE_DESCRIPTION("Generic support for concatenating of MTD devices");