1fd534e9bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * MTD device concatenation layer
41da177e4SLinus Torvalds *
5a1452a37SDavid Woodhouse * Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de>
6a1452a37SDavid Woodhouse * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
71da177e4SLinus Torvalds *
81da177e4SLinus Torvalds * NAND support by Christian Gan <cgan@iders.ca>
91da177e4SLinus Torvalds */
101da177e4SLinus Torvalds
111da177e4SLinus Torvalds #include <linux/kernel.h>
1215fdc52fSThomas Gleixner #include <linux/module.h>
131da177e4SLinus Torvalds #include <linux/slab.h>
1415fdc52fSThomas Gleixner #include <linux/sched.h>
1515fdc52fSThomas Gleixner #include <linux/types.h>
166e232cfcSDavid Howells #include <linux/backing-dev.h>
1715fdc52fSThomas Gleixner
181da177e4SLinus Torvalds #include <linux/mtd/mtd.h>
191da177e4SLinus Torvalds #include <linux/mtd/concat.h>
201da177e4SLinus Torvalds
216c8b44abSAndrew Morton #include <asm/div64.h>
226c8b44abSAndrew Morton
231da177e4SLinus Torvalds /*
241da177e4SLinus Torvalds * Our storage structure:
251da177e4SLinus Torvalds * Subdev points to an array of pointers to struct mtd_info objects
261da177e4SLinus Torvalds * which is allocated along with this structure
271da177e4SLinus Torvalds *
281da177e4SLinus Torvalds */
291da177e4SLinus Torvalds struct mtd_concat {
301da177e4SLinus Torvalds struct mtd_info mtd;
311da177e4SLinus Torvalds int num_subdev;
321da177e4SLinus Torvalds struct mtd_info **subdev;
331da177e4SLinus Torvalds };
341da177e4SLinus Torvalds
351da177e4SLinus Torvalds /*
361da177e4SLinus Torvalds * how to calculate the size required for the above structure,
371da177e4SLinus Torvalds * including the pointer array subdev points to:
381da177e4SLinus Torvalds */
391da177e4SLinus Torvalds #define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \
401da177e4SLinus Torvalds ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *)))
411da177e4SLinus Torvalds
421da177e4SLinus Torvalds /*
431da177e4SLinus Torvalds * Given a pointer to the MTD object in the mtd_concat structure,
441da177e4SLinus Torvalds * we can retrieve the pointer to that structure with this macro.
451da177e4SLinus Torvalds */
461da177e4SLinus Torvalds #define CONCAT(x) ((struct mtd_concat *)(x))
471da177e4SLinus Torvalds
481da177e4SLinus Torvalds /*
491da177e4SLinus Torvalds * MTD methods which look up the relevant subdevice, translate the
501da177e4SLinus Torvalds * effective address and pass through to the subdevice.
511da177e4SLinus Torvalds */
521da177e4SLinus Torvalds
531da177e4SLinus Torvalds static int
concat_read(struct mtd_info * mtd,loff_t from,size_t len,size_t * retlen,u_char * buf)541da177e4SLinus Torvalds concat_read(struct mtd_info *mtd, loff_t from, size_t len,
551da177e4SLinus Torvalds size_t * retlen, u_char * buf)
561da177e4SLinus Torvalds {
571da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
58f1a28c02SThomas Gleixner int ret = 0, err;
591da177e4SLinus Torvalds int i;
601da177e4SLinus Torvalds
611da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
621da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
631da177e4SLinus Torvalds size_t size, retsize;
641da177e4SLinus Torvalds
651da177e4SLinus Torvalds if (from >= subdev->size) {
661da177e4SLinus Torvalds /* Not destined for this subdev */
671da177e4SLinus Torvalds size = 0;
681da177e4SLinus Torvalds from -= subdev->size;
691da177e4SLinus Torvalds continue;
701da177e4SLinus Torvalds }
711da177e4SLinus Torvalds if (from + len > subdev->size)
721da177e4SLinus Torvalds /* First part goes into this subdev */
731da177e4SLinus Torvalds size = subdev->size - from;
741da177e4SLinus Torvalds else
751da177e4SLinus Torvalds /* Entire transaction goes into this subdev */
761da177e4SLinus Torvalds size = len;
771da177e4SLinus Torvalds
78329ad399SArtem Bityutskiy err = mtd_read(subdev, from, size, &retsize, buf);
791da177e4SLinus Torvalds
809a1fcdfdSThomas Gleixner /* Save information about bitflips! */
81f1a28c02SThomas Gleixner if (unlikely(err)) {
82d57f4054SBrian Norris if (mtd_is_eccerr(err)) {
83f1a28c02SThomas Gleixner mtd->ecc_stats.failed++;
849a1fcdfdSThomas Gleixner ret = err;
85d57f4054SBrian Norris } else if (mtd_is_bitflip(err)) {
86f1a28c02SThomas Gleixner mtd->ecc_stats.corrected++;
87f1a28c02SThomas Gleixner /* Do not overwrite -EBADMSG !! */
88f1a28c02SThomas Gleixner if (!ret)
899a1fcdfdSThomas Gleixner ret = err;
90f1a28c02SThomas Gleixner } else
91f1a28c02SThomas Gleixner return err;
929a1fcdfdSThomas Gleixner }
939a1fcdfdSThomas Gleixner
941da177e4SLinus Torvalds *retlen += retsize;
951da177e4SLinus Torvalds len -= size;
961da177e4SLinus Torvalds if (len == 0)
97f1a28c02SThomas Gleixner return ret;
981da177e4SLinus Torvalds
991da177e4SLinus Torvalds buf += size;
1001da177e4SLinus Torvalds from = 0;
1011da177e4SLinus Torvalds }
102f1a28c02SThomas Gleixner return -EINVAL;
1031da177e4SLinus Torvalds }
1041da177e4SLinus Torvalds
1051da177e4SLinus Torvalds static int
concat_panic_write(struct mtd_info * mtd,loff_t to,size_t len,size_t * retlen,const u_char * buf)1063fbe507eSMatt Weber concat_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
1073fbe507eSMatt Weber size_t * retlen, const u_char * buf)
1083fbe507eSMatt Weber {
1093fbe507eSMatt Weber struct mtd_concat *concat = CONCAT(mtd);
1103fbe507eSMatt Weber int err = -EINVAL;
1113fbe507eSMatt Weber int i;
1123fbe507eSMatt Weber for (i = 0; i < concat->num_subdev; i++) {
1133fbe507eSMatt Weber struct mtd_info *subdev = concat->subdev[i];
1143fbe507eSMatt Weber size_t size, retsize;
1153fbe507eSMatt Weber
1163fbe507eSMatt Weber if (to >= subdev->size) {
1173fbe507eSMatt Weber to -= subdev->size;
1183fbe507eSMatt Weber continue;
1193fbe507eSMatt Weber }
1203fbe507eSMatt Weber if (to + len > subdev->size)
1213fbe507eSMatt Weber size = subdev->size - to;
1223fbe507eSMatt Weber else
1233fbe507eSMatt Weber size = len;
1243fbe507eSMatt Weber
1253fbe507eSMatt Weber err = mtd_panic_write(subdev, to, size, &retsize, buf);
1263fbe507eSMatt Weber if (err == -EOPNOTSUPP) {
1273fbe507eSMatt Weber printk(KERN_ERR "mtdconcat: Cannot write from panic without panic_write\n");
1283fbe507eSMatt Weber return err;
1293fbe507eSMatt Weber }
1303fbe507eSMatt Weber if (err)
1313fbe507eSMatt Weber break;
1323fbe507eSMatt Weber
1333fbe507eSMatt Weber *retlen += retsize;
1343fbe507eSMatt Weber len -= size;
1353fbe507eSMatt Weber if (len == 0)
1363fbe507eSMatt Weber break;
1373fbe507eSMatt Weber
1383fbe507eSMatt Weber err = -EINVAL;
1393fbe507eSMatt Weber buf += size;
1403fbe507eSMatt Weber to = 0;
1413fbe507eSMatt Weber }
1423fbe507eSMatt Weber return err;
1433fbe507eSMatt Weber }
1443fbe507eSMatt Weber
1453fbe507eSMatt Weber
1463fbe507eSMatt Weber static int
concat_write(struct mtd_info * mtd,loff_t to,size_t len,size_t * retlen,const u_char * buf)1471da177e4SLinus Torvalds concat_write(struct mtd_info *mtd, loff_t to, size_t len,
1481da177e4SLinus Torvalds size_t * retlen, const u_char * buf)
1491da177e4SLinus Torvalds {
1501da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
1511da177e4SLinus Torvalds int err = -EINVAL;
1521da177e4SLinus Torvalds int i;
1531da177e4SLinus Torvalds
1541da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
1551da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
1561da177e4SLinus Torvalds size_t size, retsize;
1571da177e4SLinus Torvalds
1581da177e4SLinus Torvalds if (to >= subdev->size) {
1591da177e4SLinus Torvalds size = 0;
1601da177e4SLinus Torvalds to -= subdev->size;
1611da177e4SLinus Torvalds continue;
1621da177e4SLinus Torvalds }
1631da177e4SLinus Torvalds if (to + len > subdev->size)
1641da177e4SLinus Torvalds size = subdev->size - to;
1651da177e4SLinus Torvalds else
1661da177e4SLinus Torvalds size = len;
1671da177e4SLinus Torvalds
168eda95cbfSArtem Bityutskiy err = mtd_write(subdev, to, size, &retsize, buf);
1691da177e4SLinus Torvalds if (err)
1701da177e4SLinus Torvalds break;
1711da177e4SLinus Torvalds
1721da177e4SLinus Torvalds *retlen += retsize;
1731da177e4SLinus Torvalds len -= size;
1741da177e4SLinus Torvalds if (len == 0)
1751da177e4SLinus Torvalds break;
1761da177e4SLinus Torvalds
1771da177e4SLinus Torvalds err = -EINVAL;
1781da177e4SLinus Torvalds buf += size;
1791da177e4SLinus Torvalds to = 0;
1801da177e4SLinus Torvalds }
1811da177e4SLinus Torvalds return err;
1821da177e4SLinus Torvalds }
1831da177e4SLinus Torvalds
1841da177e4SLinus Torvalds static int
concat_writev(struct mtd_info * mtd,const struct kvec * vecs,unsigned long count,loff_t to,size_t * retlen)1859d8522dfSThomas Gleixner concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
1869d8522dfSThomas Gleixner unsigned long count, loff_t to, size_t * retlen)
187e8d32937SAlexander Belyakov {
188e8d32937SAlexander Belyakov struct mtd_concat *concat = CONCAT(mtd);
189e8d32937SAlexander Belyakov struct kvec *vecs_copy;
190e8d32937SAlexander Belyakov unsigned long entry_low, entry_high;
191e8d32937SAlexander Belyakov size_t total_len = 0;
192e8d32937SAlexander Belyakov int i;
193e8d32937SAlexander Belyakov int err = -EINVAL;
194e8d32937SAlexander Belyakov
195e8d32937SAlexander Belyakov /* Calculate total length of data */
196e8d32937SAlexander Belyakov for (i = 0; i < count; i++)
197e8d32937SAlexander Belyakov total_len += vecs[i].iov_len;
198e8d32937SAlexander Belyakov
199e8d32937SAlexander Belyakov /* Check alignment */
20028318776SJoern Engel if (mtd->writesize > 1) {
2010bf9733dSDavid Woodhouse uint64_t __to = to;
20228318776SJoern Engel if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize))
203e8d32937SAlexander Belyakov return -EINVAL;
2046c8b44abSAndrew Morton }
205e8d32937SAlexander Belyakov
206e8d32937SAlexander Belyakov /* make a copy of vecs */
207d80f2666SJulia Lawall vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL);
208e8d32937SAlexander Belyakov if (!vecs_copy)
209e8d32937SAlexander Belyakov return -ENOMEM;
210e8d32937SAlexander Belyakov
211e8d32937SAlexander Belyakov entry_low = 0;
212e8d32937SAlexander Belyakov for (i = 0; i < concat->num_subdev; i++) {
213e8d32937SAlexander Belyakov struct mtd_info *subdev = concat->subdev[i];
214e8d32937SAlexander Belyakov size_t size, wsize, retsize, old_iov_len;
215e8d32937SAlexander Belyakov
216e8d32937SAlexander Belyakov if (to >= subdev->size) {
217e8d32937SAlexander Belyakov to -= subdev->size;
218e8d32937SAlexander Belyakov continue;
219e8d32937SAlexander Belyakov }
220e8d32937SAlexander Belyakov
22169423d99SAdrian Hunter size = min_t(uint64_t, total_len, subdev->size - to);
222e8d32937SAlexander Belyakov wsize = size; /* store for future use */
223e8d32937SAlexander Belyakov
224e8d32937SAlexander Belyakov entry_high = entry_low;
225e8d32937SAlexander Belyakov while (entry_high < count) {
226e8d32937SAlexander Belyakov if (size <= vecs_copy[entry_high].iov_len)
227e8d32937SAlexander Belyakov break;
228e8d32937SAlexander Belyakov size -= vecs_copy[entry_high++].iov_len;
229e8d32937SAlexander Belyakov }
230e8d32937SAlexander Belyakov
231e8d32937SAlexander Belyakov old_iov_len = vecs_copy[entry_high].iov_len;
232e8d32937SAlexander Belyakov vecs_copy[entry_high].iov_len = size;
233e8d32937SAlexander Belyakov
234b0a31f7bSArtem Bityutskiy err = mtd_writev(subdev, &vecs_copy[entry_low],
235664addc2SArtem Bityutskiy entry_high - entry_low + 1, to, &retsize);
236e8d32937SAlexander Belyakov
237e8d32937SAlexander Belyakov vecs_copy[entry_high].iov_len = old_iov_len - size;
238e8d32937SAlexander Belyakov vecs_copy[entry_high].iov_base += size;
239e8d32937SAlexander Belyakov
240e8d32937SAlexander Belyakov entry_low = entry_high;
241e8d32937SAlexander Belyakov
242e8d32937SAlexander Belyakov if (err)
243e8d32937SAlexander Belyakov break;
244e8d32937SAlexander Belyakov
245e8d32937SAlexander Belyakov *retlen += retsize;
246e8d32937SAlexander Belyakov total_len -= wsize;
247e8d32937SAlexander Belyakov
248e8d32937SAlexander Belyakov if (total_len == 0)
249e8d32937SAlexander Belyakov break;
250e8d32937SAlexander Belyakov
251e8d32937SAlexander Belyakov err = -EINVAL;
252e8d32937SAlexander Belyakov to = 0;
253e8d32937SAlexander Belyakov }
254e8d32937SAlexander Belyakov
255e8d32937SAlexander Belyakov kfree(vecs_copy);
256e8d32937SAlexander Belyakov return err;
257e8d32937SAlexander Belyakov }
258e8d32937SAlexander Belyakov
259e8d32937SAlexander Belyakov static int
concat_read_oob(struct mtd_info * mtd,loff_t from,struct mtd_oob_ops * ops)2608593fbc6SThomas Gleixner concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
2611da177e4SLinus Torvalds {
2621da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
2638593fbc6SThomas Gleixner struct mtd_oob_ops devops = *ops;
264f1a28c02SThomas Gleixner int i, err, ret = 0;
2651da177e4SLinus Torvalds
2667014568bSVitaly Wool ops->retlen = ops->oobretlen = 0;
2671da177e4SLinus Torvalds
2681da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
2691da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
2701da177e4SLinus Torvalds
2711da177e4SLinus Torvalds if (from >= subdev->size) {
2721da177e4SLinus Torvalds from -= subdev->size;
2731da177e4SLinus Torvalds continue;
2741da177e4SLinus Torvalds }
2751da177e4SLinus Torvalds
2768593fbc6SThomas Gleixner /* partial read ? */
2778593fbc6SThomas Gleixner if (from + devops.len > subdev->size)
2788593fbc6SThomas Gleixner devops.len = subdev->size - from;
2791da177e4SLinus Torvalds
280fd2819bbSArtem Bityutskiy err = mtd_read_oob(subdev, from, &devops);
2818593fbc6SThomas Gleixner ops->retlen += devops.retlen;
2827014568bSVitaly Wool ops->oobretlen += devops.oobretlen;
283f1a28c02SThomas Gleixner
284f1a28c02SThomas Gleixner /* Save information about bitflips! */
285f1a28c02SThomas Gleixner if (unlikely(err)) {
286d57f4054SBrian Norris if (mtd_is_eccerr(err)) {
287f1a28c02SThomas Gleixner mtd->ecc_stats.failed++;
288f1a28c02SThomas Gleixner ret = err;
289d57f4054SBrian Norris } else if (mtd_is_bitflip(err)) {
290f1a28c02SThomas Gleixner mtd->ecc_stats.corrected++;
291f1a28c02SThomas Gleixner /* Do not overwrite -EBADMSG !! */
292f1a28c02SThomas Gleixner if (!ret)
293f1a28c02SThomas Gleixner ret = err;
294f1a28c02SThomas Gleixner } else
2958593fbc6SThomas Gleixner return err;
296f1a28c02SThomas Gleixner }
2971da177e4SLinus Torvalds
2987014568bSVitaly Wool if (devops.datbuf) {
2998593fbc6SThomas Gleixner devops.len = ops->len - ops->retlen;
3008593fbc6SThomas Gleixner if (!devops.len)
301f1a28c02SThomas Gleixner return ret;
3028593fbc6SThomas Gleixner devops.datbuf += devops.retlen;
3037014568bSVitaly Wool }
3047014568bSVitaly Wool if (devops.oobbuf) {
3057014568bSVitaly Wool devops.ooblen = ops->ooblen - ops->oobretlen;
3067014568bSVitaly Wool if (!devops.ooblen)
3077014568bSVitaly Wool return ret;
3087014568bSVitaly Wool devops.oobbuf += ops->oobretlen;
3097014568bSVitaly Wool }
3108593fbc6SThomas Gleixner
3111da177e4SLinus Torvalds from = 0;
3121da177e4SLinus Torvalds }
3138593fbc6SThomas Gleixner return -EINVAL;
3141da177e4SLinus Torvalds }
3151da177e4SLinus Torvalds
3161da177e4SLinus Torvalds static int
concat_write_oob(struct mtd_info * mtd,loff_t to,struct mtd_oob_ops * ops)3178593fbc6SThomas Gleixner concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
3181da177e4SLinus Torvalds {
3191da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
3208593fbc6SThomas Gleixner struct mtd_oob_ops devops = *ops;
3218593fbc6SThomas Gleixner int i, err;
3221da177e4SLinus Torvalds
3231da177e4SLinus Torvalds if (!(mtd->flags & MTD_WRITEABLE))
3241da177e4SLinus Torvalds return -EROFS;
3251da177e4SLinus Torvalds
326431e1ecaSFelix Radensky ops->retlen = ops->oobretlen = 0;
3271da177e4SLinus Torvalds
3281da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
3291da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
3301da177e4SLinus Torvalds
3311da177e4SLinus Torvalds if (to >= subdev->size) {
3321da177e4SLinus Torvalds to -= subdev->size;
3331da177e4SLinus Torvalds continue;
3341da177e4SLinus Torvalds }
3351da177e4SLinus Torvalds
3368593fbc6SThomas Gleixner /* partial write ? */
3378593fbc6SThomas Gleixner if (to + devops.len > subdev->size)
3388593fbc6SThomas Gleixner devops.len = subdev->size - to;
3391da177e4SLinus Torvalds
340a2cc5ba0SArtem Bityutskiy err = mtd_write_oob(subdev, to, &devops);
341d164ea32SNiklas Cassel ops->retlen += devops.retlen;
342d164ea32SNiklas Cassel ops->oobretlen += devops.oobretlen;
3431da177e4SLinus Torvalds if (err)
3448593fbc6SThomas Gleixner return err;
3451da177e4SLinus Torvalds
3467014568bSVitaly Wool if (devops.datbuf) {
3478593fbc6SThomas Gleixner devops.len = ops->len - ops->retlen;
3488593fbc6SThomas Gleixner if (!devops.len)
3498593fbc6SThomas Gleixner return 0;
3508593fbc6SThomas Gleixner devops.datbuf += devops.retlen;
3517014568bSVitaly Wool }
3527014568bSVitaly Wool if (devops.oobbuf) {
3537014568bSVitaly Wool devops.ooblen = ops->ooblen - ops->oobretlen;
3547014568bSVitaly Wool if (!devops.ooblen)
3557014568bSVitaly Wool return 0;
3567014568bSVitaly Wool devops.oobbuf += devops.oobretlen;
3577014568bSVitaly Wool }
3581da177e4SLinus Torvalds to = 0;
3591da177e4SLinus Torvalds }
3608593fbc6SThomas Gleixner return -EINVAL;
3611da177e4SLinus Torvalds }
3621da177e4SLinus Torvalds
concat_erase(struct mtd_info * mtd,struct erase_info * instr)3631da177e4SLinus Torvalds static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
3641da177e4SLinus Torvalds {
3651da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
3661da177e4SLinus Torvalds struct mtd_info *subdev;
3671da177e4SLinus Torvalds int i, err;
36869423d99SAdrian Hunter uint64_t length, offset = 0;
3691da177e4SLinus Torvalds struct erase_info *erase;
3701da177e4SLinus Torvalds
3711da177e4SLinus Torvalds /*
3721da177e4SLinus Torvalds * Check for proper erase block alignment of the to-be-erased area.
3731da177e4SLinus Torvalds * It is easier to do this based on the super device's erase
3741da177e4SLinus Torvalds * region info rather than looking at each particular sub-device
3751da177e4SLinus Torvalds * in turn.
3761da177e4SLinus Torvalds */
3771da177e4SLinus Torvalds if (!concat->mtd.numeraseregions) {
3781da177e4SLinus Torvalds /* the easy case: device has uniform erase block size */
3791da177e4SLinus Torvalds if (instr->addr & (concat->mtd.erasesize - 1))
3801da177e4SLinus Torvalds return -EINVAL;
3811da177e4SLinus Torvalds if (instr->len & (concat->mtd.erasesize - 1))
3821da177e4SLinus Torvalds return -EINVAL;
3831da177e4SLinus Torvalds } else {
3841da177e4SLinus Torvalds /* device has variable erase size */
3851da177e4SLinus Torvalds struct mtd_erase_region_info *erase_regions =
3861da177e4SLinus Torvalds concat->mtd.eraseregions;
3871da177e4SLinus Torvalds
3881da177e4SLinus Torvalds /*
3891da177e4SLinus Torvalds * Find the erase region where the to-be-erased area begins:
3901da177e4SLinus Torvalds */
3911da177e4SLinus Torvalds for (i = 0; i < concat->mtd.numeraseregions &&
3921da177e4SLinus Torvalds instr->addr >= erase_regions[i].offset; i++) ;
3931da177e4SLinus Torvalds --i;
3941da177e4SLinus Torvalds
3951da177e4SLinus Torvalds /*
3961da177e4SLinus Torvalds * Now erase_regions[i] is the region in which the
3971da177e4SLinus Torvalds * to-be-erased area begins. Verify that the starting
3981da177e4SLinus Torvalds * offset is aligned to this region's erase size:
3991da177e4SLinus Torvalds */
400ebf2e930SRoel Kluin if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
4011da177e4SLinus Torvalds return -EINVAL;
4021da177e4SLinus Torvalds
4031da177e4SLinus Torvalds /*
4041da177e4SLinus Torvalds * now find the erase region where the to-be-erased area ends:
4051da177e4SLinus Torvalds */
4061da177e4SLinus Torvalds for (; i < concat->mtd.numeraseregions &&
4071da177e4SLinus Torvalds (instr->addr + instr->len) >= erase_regions[i].offset;
4081da177e4SLinus Torvalds ++i) ;
4091da177e4SLinus Torvalds --i;
4101da177e4SLinus Torvalds /*
4111da177e4SLinus Torvalds * check if the ending offset is aligned to this region's erase size
4121da177e4SLinus Torvalds */
413ebf2e930SRoel Kluin if (i < 0 || ((instr->addr + instr->len) &
414ebf2e930SRoel Kluin (erase_regions[i].erasesize - 1)))
4151da177e4SLinus Torvalds return -EINVAL;
4161da177e4SLinus Torvalds }
4171da177e4SLinus Torvalds
4181da177e4SLinus Torvalds /* make a local copy of instr to avoid modifying the caller's struct */
4191da177e4SLinus Torvalds erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL);
4201da177e4SLinus Torvalds
4211da177e4SLinus Torvalds if (!erase)
4221da177e4SLinus Torvalds return -ENOMEM;
4231da177e4SLinus Torvalds
4241da177e4SLinus Torvalds *erase = *instr;
4251da177e4SLinus Torvalds length = instr->len;
4261da177e4SLinus Torvalds
4271da177e4SLinus Torvalds /*
4281da177e4SLinus Torvalds * find the subdevice where the to-be-erased area begins, adjust
4291da177e4SLinus Torvalds * starting offset to be relative to the subdevice start
4301da177e4SLinus Torvalds */
4311da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
4321da177e4SLinus Torvalds subdev = concat->subdev[i];
4331da177e4SLinus Torvalds if (subdev->size <= erase->addr) {
4341da177e4SLinus Torvalds erase->addr -= subdev->size;
4351da177e4SLinus Torvalds offset += subdev->size;
4361da177e4SLinus Torvalds } else {
4371da177e4SLinus Torvalds break;
4381da177e4SLinus Torvalds }
4391da177e4SLinus Torvalds }
4401da177e4SLinus Torvalds
4411da177e4SLinus Torvalds /* must never happen since size limit has been verified above */
442373ebfbfSEric Sesterhenn BUG_ON(i >= concat->num_subdev);
4431da177e4SLinus Torvalds
4441da177e4SLinus Torvalds /* now do the erase: */
4451da177e4SLinus Torvalds err = 0;
4461da177e4SLinus Torvalds for (; length > 0; i++) {
4471da177e4SLinus Torvalds /* loop for all subdevices affected by this request */
4481da177e4SLinus Torvalds subdev = concat->subdev[i]; /* get current subdevice */
4491da177e4SLinus Torvalds
4501da177e4SLinus Torvalds /* limit length to subdevice's size: */
4511da177e4SLinus Torvalds if (erase->addr + length > subdev->size)
4521da177e4SLinus Torvalds erase->len = subdev->size - erase->addr;
4531da177e4SLinus Torvalds else
4541da177e4SLinus Torvalds erase->len = length;
4551da177e4SLinus Torvalds
4561da177e4SLinus Torvalds length -= erase->len;
457884cfd90SBoris Brezillon if ((err = mtd_erase(subdev, erase))) {
4581da177e4SLinus Torvalds /* sanity check: should never happen since
4591da177e4SLinus Torvalds * block alignment has been checked above */
460373ebfbfSEric Sesterhenn BUG_ON(err == -EINVAL);
461bb0eb217SAdrian Hunter if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
4621da177e4SLinus Torvalds instr->fail_addr = erase->fail_addr + offset;
4631da177e4SLinus Torvalds break;
4641da177e4SLinus Torvalds }
4651da177e4SLinus Torvalds /*
4661da177e4SLinus Torvalds * erase->addr specifies the offset of the area to be
4671da177e4SLinus Torvalds * erased *within the current subdevice*. It can be
4681da177e4SLinus Torvalds * non-zero only the first time through this loop, i.e.
4691da177e4SLinus Torvalds * for the first subdevice where blocks need to be erased.
4701da177e4SLinus Torvalds * All the following erases must begin at the start of the
4711da177e4SLinus Torvalds * current subdevice, i.e. at offset zero.
4721da177e4SLinus Torvalds */
4731da177e4SLinus Torvalds erase->addr = 0;
4741da177e4SLinus Torvalds offset += subdev->size;
4751da177e4SLinus Torvalds }
4761da177e4SLinus Torvalds kfree(erase);
4771da177e4SLinus Torvalds
478884cfd90SBoris Brezillon return err;
4791da177e4SLinus Torvalds }
4801da177e4SLinus Torvalds
concat_xxlock(struct mtd_info * mtd,loff_t ofs,uint64_t len,bool is_lock)4816a08a2f1SChris Packham static int concat_xxlock(struct mtd_info *mtd, loff_t ofs, uint64_t len,
4826a08a2f1SChris Packham bool is_lock)
4831da177e4SLinus Torvalds {
4841da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
4851da177e4SLinus Torvalds int i, err = -EINVAL;
4861da177e4SLinus Torvalds
4871da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
4881da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
48969423d99SAdrian Hunter uint64_t size;
4901da177e4SLinus Torvalds
4911da177e4SLinus Torvalds if (ofs >= subdev->size) {
4921da177e4SLinus Torvalds size = 0;
4931da177e4SLinus Torvalds ofs -= subdev->size;
4941da177e4SLinus Torvalds continue;
4951da177e4SLinus Torvalds }
4961da177e4SLinus Torvalds if (ofs + len > subdev->size)
4971da177e4SLinus Torvalds size = subdev->size - ofs;
4981da177e4SLinus Torvalds else
4991da177e4SLinus Torvalds size = len;
5001da177e4SLinus Torvalds
5016a08a2f1SChris Packham if (is_lock)
5027799f9acSArtem Bityutskiy err = mtd_lock(subdev, ofs, size);
5031da177e4SLinus Torvalds else
504b66005cdSArtem Bityutskiy err = mtd_unlock(subdev, ofs, size);
5051da177e4SLinus Torvalds if (err)
5061da177e4SLinus Torvalds break;
5071da177e4SLinus Torvalds
5081da177e4SLinus Torvalds len -= size;
5091da177e4SLinus Torvalds if (len == 0)
5101da177e4SLinus Torvalds break;
5111da177e4SLinus Torvalds
5121da177e4SLinus Torvalds err = -EINVAL;
5131da177e4SLinus Torvalds ofs = 0;
5141da177e4SLinus Torvalds }
5151da177e4SLinus Torvalds
5161da177e4SLinus Torvalds return err;
5171da177e4SLinus Torvalds }
5181da177e4SLinus Torvalds
concat_lock(struct mtd_info * mtd,loff_t ofs,uint64_t len)5196a08a2f1SChris Packham static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
5206a08a2f1SChris Packham {
5216a08a2f1SChris Packham return concat_xxlock(mtd, ofs, len, true);
5226a08a2f1SChris Packham }
5236a08a2f1SChris Packham
concat_unlock(struct mtd_info * mtd,loff_t ofs,uint64_t len)5246a08a2f1SChris Packham static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
5256a08a2f1SChris Packham {
5266a08a2f1SChris Packham return concat_xxlock(mtd, ofs, len, false);
5276a08a2f1SChris Packham }
5286a08a2f1SChris Packham
concat_is_locked(struct mtd_info * mtd,loff_t ofs,uint64_t len)5293bb4bba7SChris Packham static int concat_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
5303bb4bba7SChris Packham {
5313bb4bba7SChris Packham struct mtd_concat *concat = CONCAT(mtd);
5323bb4bba7SChris Packham int i, err = -EINVAL;
5333bb4bba7SChris Packham
5343bb4bba7SChris Packham for (i = 0; i < concat->num_subdev; i++) {
5353bb4bba7SChris Packham struct mtd_info *subdev = concat->subdev[i];
5363bb4bba7SChris Packham
5373bb4bba7SChris Packham if (ofs >= subdev->size) {
5383bb4bba7SChris Packham ofs -= subdev->size;
5393bb4bba7SChris Packham continue;
5403bb4bba7SChris Packham }
5413bb4bba7SChris Packham
5423bb4bba7SChris Packham if (ofs + len > subdev->size)
5433bb4bba7SChris Packham break;
5443bb4bba7SChris Packham
5453bb4bba7SChris Packham return mtd_is_locked(subdev, ofs, len);
5463bb4bba7SChris Packham }
5473bb4bba7SChris Packham
5483bb4bba7SChris Packham return err;
5493bb4bba7SChris Packham }
5503bb4bba7SChris Packham
concat_sync(struct mtd_info * mtd)5511da177e4SLinus Torvalds static void concat_sync(struct mtd_info *mtd)
5521da177e4SLinus Torvalds {
5531da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
5541da177e4SLinus Torvalds int i;
5551da177e4SLinus Torvalds
5561da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
5571da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
55885f2f2a8SArtem Bityutskiy mtd_sync(subdev);
5591da177e4SLinus Torvalds }
5601da177e4SLinus Torvalds }
5611da177e4SLinus Torvalds
concat_suspend(struct mtd_info * mtd)5621da177e4SLinus Torvalds static int concat_suspend(struct mtd_info *mtd)
5631da177e4SLinus Torvalds {
5641da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
5651da177e4SLinus Torvalds int i, rc = 0;
5661da177e4SLinus Torvalds
5671da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
5681da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
5693fe4bae8SArtem Bityutskiy if ((rc = mtd_suspend(subdev)) < 0)
5701da177e4SLinus Torvalds return rc;
5711da177e4SLinus Torvalds }
5721da177e4SLinus Torvalds return rc;
5731da177e4SLinus Torvalds }
5741da177e4SLinus Torvalds
concat_resume(struct mtd_info * mtd)5751da177e4SLinus Torvalds static void concat_resume(struct mtd_info *mtd)
5761da177e4SLinus Torvalds {
5771da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
5781da177e4SLinus Torvalds int i;
5791da177e4SLinus Torvalds
5801da177e4SLinus Torvalds for (i = 0; i < concat->num_subdev; i++) {
5811da177e4SLinus Torvalds struct mtd_info *subdev = concat->subdev[i];
582ead995f8SArtem Bityutskiy mtd_resume(subdev);
5831da177e4SLinus Torvalds }
5841da177e4SLinus Torvalds }
5851da177e4SLinus Torvalds
concat_block_isbad(struct mtd_info * mtd,loff_t ofs)586e8d32937SAlexander Belyakov static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs)
587e8d32937SAlexander Belyakov {
588e8d32937SAlexander Belyakov struct mtd_concat *concat = CONCAT(mtd);
589e8d32937SAlexander Belyakov int i, res = 0;
590e8d32937SAlexander Belyakov
5918f461a73SArtem Bityutskiy if (!mtd_can_have_bb(concat->subdev[0]))
592e8d32937SAlexander Belyakov return res;
593e8d32937SAlexander Belyakov
594e8d32937SAlexander Belyakov for (i = 0; i < concat->num_subdev; i++) {
595e8d32937SAlexander Belyakov struct mtd_info *subdev = concat->subdev[i];
596e8d32937SAlexander Belyakov
597e8d32937SAlexander Belyakov if (ofs >= subdev->size) {
598e8d32937SAlexander Belyakov ofs -= subdev->size;
599e8d32937SAlexander Belyakov continue;
600e8d32937SAlexander Belyakov }
601e8d32937SAlexander Belyakov
6027086c19dSArtem Bityutskiy res = mtd_block_isbad(subdev, ofs);
603e8d32937SAlexander Belyakov break;
604e8d32937SAlexander Belyakov }
605e8d32937SAlexander Belyakov
606e8d32937SAlexander Belyakov return res;
607e8d32937SAlexander Belyakov }
608e8d32937SAlexander Belyakov
concat_block_markbad(struct mtd_info * mtd,loff_t ofs)609e8d32937SAlexander Belyakov static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
610e8d32937SAlexander Belyakov {
611e8d32937SAlexander Belyakov struct mtd_concat *concat = CONCAT(mtd);
612e8d32937SAlexander Belyakov int i, err = -EINVAL;
613e8d32937SAlexander Belyakov
614e8d32937SAlexander Belyakov for (i = 0; i < concat->num_subdev; i++) {
615e8d32937SAlexander Belyakov struct mtd_info *subdev = concat->subdev[i];
616e8d32937SAlexander Belyakov
617e8d32937SAlexander Belyakov if (ofs >= subdev->size) {
618e8d32937SAlexander Belyakov ofs -= subdev->size;
619e8d32937SAlexander Belyakov continue;
620e8d32937SAlexander Belyakov }
621e8d32937SAlexander Belyakov
6225942ddbcSArtem Bityutskiy err = mtd_block_markbad(subdev, ofs);
623f1a28c02SThomas Gleixner if (!err)
624f1a28c02SThomas Gleixner mtd->ecc_stats.badblocks++;
625e8d32937SAlexander Belyakov break;
626e8d32937SAlexander Belyakov }
627e8d32937SAlexander Belyakov
628e8d32937SAlexander Belyakov return err;
629e8d32937SAlexander Belyakov }
630e8d32937SAlexander Belyakov
6311da177e4SLinus Torvalds /*
6321da177e4SLinus Torvalds * This function constructs a virtual MTD device by concatenating
6331da177e4SLinus Torvalds * num_devs MTD devices. A pointer to the new device object is
6341da177e4SLinus Torvalds * stored to *new_dev upon success. This function does _not_
6351da177e4SLinus Torvalds * register any devices: this is the caller's responsibility.
6361da177e4SLinus Torvalds */
mtd_concat_create(struct mtd_info * subdev[],int num_devs,const char * name)6371da177e4SLinus Torvalds struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */
6381da177e4SLinus Torvalds int num_devs, /* number of subdevices */
639160bbab3SKay Sievers const char *name)
6401da177e4SLinus Torvalds { /* name for the new device */
6411da177e4SLinus Torvalds int i;
6421da177e4SLinus Torvalds size_t size;
6431da177e4SLinus Torvalds struct mtd_concat *concat;
644f9e109a2SZhihao Cheng struct mtd_info *subdev_master = NULL;
64526cdb67cSDavid Woodhouse uint32_t max_erasesize, curr_erasesize;
6461da177e4SLinus Torvalds int num_erase_region;
647771df619SHolger Brunck int max_writebufsize = 0;
6481da177e4SLinus Torvalds
6491da177e4SLinus Torvalds printk(KERN_NOTICE "Concatenating MTD devices:\n");
6501da177e4SLinus Torvalds for (i = 0; i < num_devs; i++)
6511da177e4SLinus Torvalds printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name);
6521da177e4SLinus Torvalds printk(KERN_NOTICE "into device \"%s\"\n", name);
6531da177e4SLinus Torvalds
6541da177e4SLinus Torvalds /* allocate the device structure */
6551da177e4SLinus Torvalds size = SIZEOF_STRUCT_MTD_CONCAT(num_devs);
65695b93a0cSBurman Yan concat = kzalloc(size, GFP_KERNEL);
6571da177e4SLinus Torvalds if (!concat) {
6581da177e4SLinus Torvalds printk
6591da177e4SLinus Torvalds ("memory allocation error while creating concatenated device \"%s\"\n",
6601da177e4SLinus Torvalds name);
6611da177e4SLinus Torvalds return NULL;
6621da177e4SLinus Torvalds }
6631da177e4SLinus Torvalds concat->subdev = (struct mtd_info **) (concat + 1);
6641da177e4SLinus Torvalds
6651da177e4SLinus Torvalds /*
6661da177e4SLinus Torvalds * Set up the new "super" device's MTD object structure, check for
66792394b5cSBrian Norris * incompatibilities between the subdevices.
6681da177e4SLinus Torvalds */
6691da177e4SLinus Torvalds concat->mtd.type = subdev[0]->type;
6701da177e4SLinus Torvalds concat->mtd.flags = subdev[0]->flags;
6711da177e4SLinus Torvalds concat->mtd.size = subdev[0]->size;
6721da177e4SLinus Torvalds concat->mtd.erasesize = subdev[0]->erasesize;
67328318776SJoern Engel concat->mtd.writesize = subdev[0]->writesize;
674771df619SHolger Brunck
675771df619SHolger Brunck for (i = 0; i < num_devs; i++)
676771df619SHolger Brunck if (max_writebufsize < subdev[i]->writebufsize)
677771df619SHolger Brunck max_writebufsize = subdev[i]->writebufsize;
678771df619SHolger Brunck concat->mtd.writebufsize = max_writebufsize;
679771df619SHolger Brunck
680a2e1b833SChris Paulson-Ellis concat->mtd.subpage_sft = subdev[0]->subpage_sft;
6811da177e4SLinus Torvalds concat->mtd.oobsize = subdev[0]->oobsize;
6821f92267cSVitaly Wool concat->mtd.oobavail = subdev[0]->oobavail;
683f9e109a2SZhihao Cheng
684f9e109a2SZhihao Cheng subdev_master = mtd_get_master(subdev[0]);
685f9e109a2SZhihao Cheng if (subdev_master->_writev)
6863c3c10bbSArtem Bityutskiy concat->mtd._writev = concat_writev;
687f9e109a2SZhihao Cheng if (subdev_master->_read_oob)
6883c3c10bbSArtem Bityutskiy concat->mtd._read_oob = concat_read_oob;
689f9e109a2SZhihao Cheng if (subdev_master->_write_oob)
6903c3c10bbSArtem Bityutskiy concat->mtd._write_oob = concat_write_oob;
691f9e109a2SZhihao Cheng if (subdev_master->_block_isbad)
6923c3c10bbSArtem Bityutskiy concat->mtd._block_isbad = concat_block_isbad;
693f9e109a2SZhihao Cheng if (subdev_master->_block_markbad)
6943c3c10bbSArtem Bityutskiy concat->mtd._block_markbad = concat_block_markbad;
695f9e109a2SZhihao Cheng if (subdev_master->_panic_write)
6963fbe507eSMatt Weber concat->mtd._panic_write = concat_panic_write;
697a89d69a4SZhihao Cheng if (subdev_master->_read)
698a89d69a4SZhihao Cheng concat->mtd._read = concat_read;
699a89d69a4SZhihao Cheng if (subdev_master->_write)
700a89d69a4SZhihao Cheng concat->mtd._write = concat_write;
7011da177e4SLinus Torvalds
702f1a28c02SThomas Gleixner concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks;
703f1a28c02SThomas Gleixner
7041da177e4SLinus Torvalds concat->subdev[0] = subdev[0];
7051da177e4SLinus Torvalds
7061da177e4SLinus Torvalds for (i = 1; i < num_devs; i++) {
7071da177e4SLinus Torvalds if (concat->mtd.type != subdev[i]->type) {
7081da177e4SLinus Torvalds kfree(concat);
7091da177e4SLinus Torvalds printk("Incompatible device type on \"%s\"\n",
7101da177e4SLinus Torvalds subdev[i]->name);
7111da177e4SLinus Torvalds return NULL;
7121da177e4SLinus Torvalds }
7131da177e4SLinus Torvalds if (concat->mtd.flags != subdev[i]->flags) {
7141da177e4SLinus Torvalds /*
7151da177e4SLinus Torvalds * Expect all flags except MTD_WRITEABLE to be
7161da177e4SLinus Torvalds * equal on all subdevices.
7171da177e4SLinus Torvalds */
7181da177e4SLinus Torvalds if ((concat->mtd.flags ^ subdev[i]->
7191da177e4SLinus Torvalds flags) & ~MTD_WRITEABLE) {
7201da177e4SLinus Torvalds kfree(concat);
7211da177e4SLinus Torvalds printk("Incompatible device flags on \"%s\"\n",
7221da177e4SLinus Torvalds subdev[i]->name);
7231da177e4SLinus Torvalds return NULL;
7241da177e4SLinus Torvalds } else
7251da177e4SLinus Torvalds /* if writeable attribute differs,
7261da177e4SLinus Torvalds make super device writeable */
7271da177e4SLinus Torvalds concat->mtd.flags |=
7281da177e4SLinus Torvalds subdev[i]->flags & MTD_WRITEABLE;
7291da177e4SLinus Torvalds }
7306e232cfcSDavid Howells
731f9e109a2SZhihao Cheng subdev_master = mtd_get_master(subdev[i]);
7321da177e4SLinus Torvalds concat->mtd.size += subdev[i]->size;
733f1a28c02SThomas Gleixner concat->mtd.ecc_stats.badblocks +=
734f1a28c02SThomas Gleixner subdev[i]->ecc_stats.badblocks;
73528318776SJoern Engel if (concat->mtd.writesize != subdev[i]->writesize ||
73629072b96SThomas Gleixner concat->mtd.subpage_sft != subdev[i]->subpage_sft ||
7371da177e4SLinus Torvalds concat->mtd.oobsize != subdev[i]->oobsize ||
738f9e109a2SZhihao Cheng !concat->mtd._read_oob != !subdev_master->_read_oob ||
739f9e109a2SZhihao Cheng !concat->mtd._write_oob != !subdev_master->_write_oob) {
740f9e109a2SZhihao Cheng /*
741f9e109a2SZhihao Cheng * Check against subdev[i] for data members, because
742f9e109a2SZhihao Cheng * subdev's attributes may be different from master
743f9e109a2SZhihao Cheng * mtd device. Check against subdev's master mtd
744f9e109a2SZhihao Cheng * device for callbacks, because the existence of
745f9e109a2SZhihao Cheng * subdev's callbacks is decided by master mtd device.
746f9e109a2SZhihao Cheng */
7471da177e4SLinus Torvalds kfree(concat);
7481da177e4SLinus Torvalds printk("Incompatible OOB or ECC data on \"%s\"\n",
7491da177e4SLinus Torvalds subdev[i]->name);
7501da177e4SLinus Torvalds return NULL;
7511da177e4SLinus Torvalds }
7521da177e4SLinus Torvalds concat->subdev[i] = subdev[i];
7531da177e4SLinus Torvalds
7541da177e4SLinus Torvalds }
7551da177e4SLinus Torvalds
756adbbc3bcSBoris Brezillon mtd_set_ooblayout(&concat->mtd, subdev[0]->ooblayout);
757e8d32937SAlexander Belyakov
7581da177e4SLinus Torvalds concat->num_subdev = num_devs;
7591da177e4SLinus Torvalds concat->mtd.name = name;
7601da177e4SLinus Torvalds
7613c3c10bbSArtem Bityutskiy concat->mtd._erase = concat_erase;
7623c3c10bbSArtem Bityutskiy concat->mtd._sync = concat_sync;
7633c3c10bbSArtem Bityutskiy concat->mtd._lock = concat_lock;
7643c3c10bbSArtem Bityutskiy concat->mtd._unlock = concat_unlock;
7653bb4bba7SChris Packham concat->mtd._is_locked = concat_is_locked;
7663c3c10bbSArtem Bityutskiy concat->mtd._suspend = concat_suspend;
7673c3c10bbSArtem Bityutskiy concat->mtd._resume = concat_resume;
7681da177e4SLinus Torvalds
7691da177e4SLinus Torvalds /*
7701da177e4SLinus Torvalds * Combine the erase block size info of the subdevices:
7711da177e4SLinus Torvalds *
7721da177e4SLinus Torvalds * first, walk the map of the new device and see how
7731da177e4SLinus Torvalds * many changes in erase size we have
7741da177e4SLinus Torvalds */
7751da177e4SLinus Torvalds max_erasesize = curr_erasesize = subdev[0]->erasesize;
7761da177e4SLinus Torvalds num_erase_region = 1;
7771da177e4SLinus Torvalds for (i = 0; i < num_devs; i++) {
7781da177e4SLinus Torvalds if (subdev[i]->numeraseregions == 0) {
7791da177e4SLinus Torvalds /* current subdevice has uniform erase size */
7801da177e4SLinus Torvalds if (subdev[i]->erasesize != curr_erasesize) {
7811da177e4SLinus Torvalds /* if it differs from the last subdevice's erase size, count it */
7821da177e4SLinus Torvalds ++num_erase_region;
7831da177e4SLinus Torvalds curr_erasesize = subdev[i]->erasesize;
7841da177e4SLinus Torvalds if (curr_erasesize > max_erasesize)
7851da177e4SLinus Torvalds max_erasesize = curr_erasesize;
7861da177e4SLinus Torvalds }
7871da177e4SLinus Torvalds } else {
7881da177e4SLinus Torvalds /* current subdevice has variable erase size */
7891da177e4SLinus Torvalds int j;
7901da177e4SLinus Torvalds for (j = 0; j < subdev[i]->numeraseregions; j++) {
7911da177e4SLinus Torvalds
7921da177e4SLinus Torvalds /* walk the list of erase regions, count any changes */
7931da177e4SLinus Torvalds if (subdev[i]->eraseregions[j].erasesize !=
7941da177e4SLinus Torvalds curr_erasesize) {
7951da177e4SLinus Torvalds ++num_erase_region;
7961da177e4SLinus Torvalds curr_erasesize =
7971da177e4SLinus Torvalds subdev[i]->eraseregions[j].
7981da177e4SLinus Torvalds erasesize;
7991da177e4SLinus Torvalds if (curr_erasesize > max_erasesize)
8001da177e4SLinus Torvalds max_erasesize = curr_erasesize;
8011da177e4SLinus Torvalds }
8021da177e4SLinus Torvalds }
8031da177e4SLinus Torvalds }
8041da177e4SLinus Torvalds }
8051da177e4SLinus Torvalds
8061da177e4SLinus Torvalds if (num_erase_region == 1) {
8071da177e4SLinus Torvalds /*
8081da177e4SLinus Torvalds * All subdevices have the same uniform erase size.
8091da177e4SLinus Torvalds * This is easy:
8101da177e4SLinus Torvalds */
8111da177e4SLinus Torvalds concat->mtd.erasesize = curr_erasesize;
8121da177e4SLinus Torvalds concat->mtd.numeraseregions = 0;
8131da177e4SLinus Torvalds } else {
81469423d99SAdrian Hunter uint64_t tmp64;
81569423d99SAdrian Hunter
8161da177e4SLinus Torvalds /*
8171da177e4SLinus Torvalds * erase block size varies across the subdevices: allocate
8181da177e4SLinus Torvalds * space to store the data describing the variable erase regions
8191da177e4SLinus Torvalds */
8201da177e4SLinus Torvalds struct mtd_erase_region_info *erase_region_p;
82169423d99SAdrian Hunter uint64_t begin, position;
8221da177e4SLinus Torvalds
8231da177e4SLinus Torvalds concat->mtd.erasesize = max_erasesize;
8241da177e4SLinus Torvalds concat->mtd.numeraseregions = num_erase_region;
8251da177e4SLinus Torvalds concat->mtd.eraseregions = erase_region_p =
8266da2ec56SKees Cook kmalloc_array(num_erase_region,
8276da2ec56SKees Cook sizeof(struct mtd_erase_region_info),
8286da2ec56SKees Cook GFP_KERNEL);
8291da177e4SLinus Torvalds if (!erase_region_p) {
8301da177e4SLinus Torvalds kfree(concat);
8311da177e4SLinus Torvalds printk
8321da177e4SLinus Torvalds ("memory allocation error while creating erase region list"
8331da177e4SLinus Torvalds " for device \"%s\"\n", name);
8341da177e4SLinus Torvalds return NULL;
8351da177e4SLinus Torvalds }
8361da177e4SLinus Torvalds
8371da177e4SLinus Torvalds /*
8381da177e4SLinus Torvalds * walk the map of the new device once more and fill in
839*9ee67182Swangjianli * erase region info:
8401da177e4SLinus Torvalds */
8411da177e4SLinus Torvalds curr_erasesize = subdev[0]->erasesize;
8421da177e4SLinus Torvalds begin = position = 0;
8431da177e4SLinus Torvalds for (i = 0; i < num_devs; i++) {
8441da177e4SLinus Torvalds if (subdev[i]->numeraseregions == 0) {
8451da177e4SLinus Torvalds /* current subdevice has uniform erase size */
8461da177e4SLinus Torvalds if (subdev[i]->erasesize != curr_erasesize) {
8471da177e4SLinus Torvalds /*
8481da177e4SLinus Torvalds * fill in an mtd_erase_region_info structure for the area
8491da177e4SLinus Torvalds * we have walked so far:
8501da177e4SLinus Torvalds */
8511da177e4SLinus Torvalds erase_region_p->offset = begin;
8521da177e4SLinus Torvalds erase_region_p->erasesize =
8531da177e4SLinus Torvalds curr_erasesize;
85469423d99SAdrian Hunter tmp64 = position - begin;
85569423d99SAdrian Hunter do_div(tmp64, curr_erasesize);
85669423d99SAdrian Hunter erase_region_p->numblocks = tmp64;
8571da177e4SLinus Torvalds begin = position;
8581da177e4SLinus Torvalds
8591da177e4SLinus Torvalds curr_erasesize = subdev[i]->erasesize;
8601da177e4SLinus Torvalds ++erase_region_p;
8611da177e4SLinus Torvalds }
8621da177e4SLinus Torvalds position += subdev[i]->size;
8631da177e4SLinus Torvalds } else {
8641da177e4SLinus Torvalds /* current subdevice has variable erase size */
8651da177e4SLinus Torvalds int j;
8661da177e4SLinus Torvalds for (j = 0; j < subdev[i]->numeraseregions; j++) {
8671da177e4SLinus Torvalds /* walk the list of erase regions, count any changes */
8681da177e4SLinus Torvalds if (subdev[i]->eraseregions[j].
8691da177e4SLinus Torvalds erasesize != curr_erasesize) {
8701da177e4SLinus Torvalds erase_region_p->offset = begin;
8711da177e4SLinus Torvalds erase_region_p->erasesize =
8721da177e4SLinus Torvalds curr_erasesize;
87369423d99SAdrian Hunter tmp64 = position - begin;
87469423d99SAdrian Hunter do_div(tmp64, curr_erasesize);
87569423d99SAdrian Hunter erase_region_p->numblocks = tmp64;
8761da177e4SLinus Torvalds begin = position;
8771da177e4SLinus Torvalds
8781da177e4SLinus Torvalds curr_erasesize =
8791da177e4SLinus Torvalds subdev[i]->eraseregions[j].
8801da177e4SLinus Torvalds erasesize;
8811da177e4SLinus Torvalds ++erase_region_p;
8821da177e4SLinus Torvalds }
8831da177e4SLinus Torvalds position +=
8841da177e4SLinus Torvalds subdev[i]->eraseregions[j].
88569423d99SAdrian Hunter numblocks * (uint64_t)curr_erasesize;
8861da177e4SLinus Torvalds }
8871da177e4SLinus Torvalds }
8881da177e4SLinus Torvalds }
8891da177e4SLinus Torvalds /* Now write the final entry */
8901da177e4SLinus Torvalds erase_region_p->offset = begin;
8911da177e4SLinus Torvalds erase_region_p->erasesize = curr_erasesize;
89269423d99SAdrian Hunter tmp64 = position - begin;
89369423d99SAdrian Hunter do_div(tmp64, curr_erasesize);
89469423d99SAdrian Hunter erase_region_p->numblocks = tmp64;
8951da177e4SLinus Torvalds }
8961da177e4SLinus Torvalds
8971da177e4SLinus Torvalds return &concat->mtd;
8981da177e4SLinus Torvalds }
8991da177e4SLinus Torvalds
9000dcf2572SMiquel Raynal /* Cleans the context obtained from mtd_concat_create() */
mtd_concat_destroy(struct mtd_info * mtd)9011da177e4SLinus Torvalds void mtd_concat_destroy(struct mtd_info *mtd)
9021da177e4SLinus Torvalds {
9031da177e4SLinus Torvalds struct mtd_concat *concat = CONCAT(mtd);
9041da177e4SLinus Torvalds if (concat->mtd.numeraseregions)
9051da177e4SLinus Torvalds kfree(concat->mtd.eraseregions);
9061da177e4SLinus Torvalds kfree(concat);
9071da177e4SLinus Torvalds }
9081da177e4SLinus Torvalds
9091da177e4SLinus Torvalds EXPORT_SYMBOL(mtd_concat_create);
9101da177e4SLinus Torvalds EXPORT_SYMBOL(mtd_concat_destroy);
9111da177e4SLinus Torvalds
9121da177e4SLinus Torvalds MODULE_LICENSE("GPL");
9131da177e4SLinus Torvalds MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>");
9141da177e4SLinus Torvalds MODULE_DESCRIPTION("Generic support for concatenating of MTD devices");
915