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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Simple MTD partitioning layer
3 *
David Woodhousea1452a32010-08-08 20:58:20 +01004 * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
5 * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
6 * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
David Woodhousea1452a32010-08-08 20:58:20 +01008 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 *
David Woodhousea1452a32010-08-08 20:58:20 +010013 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 *
Thomas Gleixner97894cd2005-11-07 11:15:26 +000022 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/kernel.h>
27#include <linux/slab.h>
28#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/kmod.h>
30#include <linux/mtd/mtd.h>
31#include <linux/mtd/partitions.h>
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +030032#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Jamie Ileseea72d52011-05-23 10:23:42 +010034#include "mtdcore.h"
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036/* Our partition linked list */
37static LIST_HEAD(mtd_partitions);
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +030038static DEFINE_MUTEX(mtd_partitions_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40/* Our partition node structure */
41struct mtd_part {
42 struct mtd_info mtd;
43 struct mtd_info *master;
Adrian Hunter69423d92008-12-10 13:37:21 +000044 uint64_t offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046};
47
48/*
49 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
50 * the pointer to that structure with this macro.
51 */
52#define PART(x) ((struct mtd_part *)(x))
53
Thomas Gleixner97894cd2005-11-07 11:15:26 +000054
55/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 * MTD methods which simply translate the effective address and pass through
57 * to the _real_ device.
58 */
59
Atsushi Nemotob33a2882008-07-19 01:00:33 +090060static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
61 size_t *retlen, u_char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 struct mtd_part *part = PART(mtd);
Yauhen Kharuzhyd8877f12009-03-27 00:41:09 +020064 struct mtd_ecc_stats stats;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020065 int res;
66
Yauhen Kharuzhyd8877f12009-03-27 00:41:09 +020067 stats = part->master->ecc_stats;
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 if (from >= mtd->size)
70 len = 0;
71 else if (from + len > mtd->size)
72 len = mtd->size - from;
Artem Bityutskiy329ad392011-12-23 17:30:16 +020073 res = mtd_read(part->master, from + part->offset, len, retlen, buf);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020074 if (unlikely(res)) {
Brian Norrisd57f40542011-09-20 18:34:25 -070075 if (mtd_is_bitflip(res))
Yauhen Kharuzhyd8877f12009-03-27 00:41:09 +020076 mtd->ecc_stats.corrected += part->master->ecc_stats.corrected - stats.corrected;
Brian Norrisd57f40542011-09-20 18:34:25 -070077 if (mtd_is_eccerr(res))
Yauhen Kharuzhyd8877f12009-03-27 00:41:09 +020078 mtd->ecc_stats.failed += part->master->ecc_stats.failed - stats.failed;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020079 }
80 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
82
Atsushi Nemotob33a2882008-07-19 01:00:33 +090083static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
84 size_t *retlen, void **virt, resource_size_t *phys)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
86 struct mtd_part *part = PART(mtd);
87 if (from >= mtd->size)
88 len = 0;
89 else if (from + len > mtd->size)
90 len = mtd->size - from;
Artem Bityutskiyd35ea202011-12-23 17:00:37 +020091 return mtd_point(part->master, from + part->offset, len, retlen,
92 virt, phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
Thomas Gleixner9223a452006-05-23 17:21:03 +020094
Jared Hulberta98889f2008-04-29 23:26:49 -070095static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
97 struct mtd_part *part = PART(mtd);
98
Artem Bityutskiy72197782011-12-23 17:05:52 +020099 mtd_unpoint(part->master, from + part->offset, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
David Howells402d3262009-02-12 10:40:00 +0000102static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
103 unsigned long len,
104 unsigned long offset,
105 unsigned long flags)
106{
107 struct mtd_part *part = PART(mtd);
108
109 offset += part->offset;
Artem Bityutskiy04c601b2011-12-23 17:10:15 +0200110 return mtd_get_unmapped_area(part->master, len, offset, flags);
David Howells402d3262009-02-12 10:40:00 +0000111}
112
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200113static int part_read_oob(struct mtd_info *mtd, loff_t from,
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900114 struct mtd_oob_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
116 struct mtd_part *part = PART(mtd);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200117 int res;
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (from >= mtd->size)
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200120 return -EINVAL;
Vitaly Wool70145682006-11-03 18:20:38 +0300121 if (ops->datbuf && from + ops->len > mtd->size)
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200122 return -EINVAL;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200123
Artem Bityutskiy154bf892011-01-16 17:50:54 +0200124 /*
125 * If OOB is also requested, make sure that we do not read past the end
126 * of this partition.
127 */
128 if (ops->oobbuf) {
129 size_t len, pages;
130
Brian Norris0612b9d2011-08-30 18:45:40 -0700131 if (ops->mode == MTD_OPS_AUTO_OOB)
Artem Bityutskiy154bf892011-01-16 17:50:54 +0200132 len = mtd->oobavail;
133 else
134 len = mtd->oobsize;
135 pages = mtd_div_by_ws(mtd->size, mtd);
136 pages -= mtd_div_by_ws(from, mtd);
137 if (ops->ooboffs + ops->ooblen > pages * len)
138 return -EINVAL;
139 }
140
Artem Bityutskiyfd2819b2011-12-23 18:27:05 +0200141 res = mtd_read_oob(part->master, from + part->offset, ops);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200142 if (unlikely(res)) {
Brian Norrisd57f40542011-09-20 18:34:25 -0700143 if (mtd_is_bitflip(res))
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200144 mtd->ecc_stats.corrected++;
Brian Norrisd57f40542011-09-20 18:34:25 -0700145 if (mtd_is_eccerr(res))
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200146 mtd->ecc_stats.failed++;
147 }
148 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
150
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900151static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
152 size_t len, size_t *retlen, u_char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
154 struct mtd_part *part = PART(mtd);
Artem Bityutskiy4ea1cab2011-12-23 18:47:59 +0200155 return mtd_read_user_prot_reg(part->master, from, len, retlen, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900158static int part_get_user_prot_info(struct mtd_info *mtd,
159 struct otp_info *buf, size_t len)
Nicolas Pitref77814d2005-02-08 17:11:19 +0000160{
161 struct mtd_part *part = PART(mtd);
Artem Bityutskiy855e5d82011-12-23 18:45:11 +0200162 return mtd_get_user_prot_info(part->master, buf, len);
Nicolas Pitref77814d2005-02-08 17:11:19 +0000163}
164
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900165static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
166 size_t len, size_t *retlen, u_char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
168 struct mtd_part *part = PART(mtd);
Artem Bityutskiyd264f722011-12-23 18:40:06 +0200169 return mtd_read_fact_prot_reg(part->master, from, len, retlen, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900172static int part_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
173 size_t len)
Nicolas Pitref77814d2005-02-08 17:11:19 +0000174{
175 struct mtd_part *part = PART(mtd);
Artem Bityutskiya750b5c2011-12-23 18:33:28 +0200176 return mtd_get_fact_prot_info(part->master, buf, len);
Nicolas Pitref77814d2005-02-08 17:11:19 +0000177}
178
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900179static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
180 size_t *retlen, const u_char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 struct mtd_part *part = PART(mtd);
183 if (!(mtd->flags & MTD_WRITEABLE))
184 return -EROFS;
185 if (to >= mtd->size)
186 len = 0;
187 else if (to + len > mtd->size)
188 len = mtd->size - to;
Artem Bityutskiyeda95cb2011-12-23 17:35:41 +0200189 return mtd_write(part->master, to + part->offset, len, retlen, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900192static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
193 size_t *retlen, const u_char *buf)
Richard Purdie388bbb02008-02-06 10:17:15 +0000194{
195 struct mtd_part *part = PART(mtd);
196 if (!(mtd->flags & MTD_WRITEABLE))
197 return -EROFS;
198 if (to >= mtd->size)
199 len = 0;
200 else if (to + len > mtd->size)
201 len = mtd->size - to;
Artem Bityutskiy7ae79d72011-12-23 18:03:17 +0200202 return mtd_panic_write(part->master, to + part->offset, len, retlen,
203 buf);
Richard Purdie388bbb02008-02-06 10:17:15 +0000204}
205
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200206static int part_write_oob(struct mtd_info *mtd, loff_t to,
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900207 struct mtd_oob_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209 struct mtd_part *part = PART(mtd);
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 if (!(mtd->flags & MTD_WRITEABLE))
212 return -EROFS;
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (to >= mtd->size)
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200215 return -EINVAL;
Vitaly Wool70145682006-11-03 18:20:38 +0300216 if (ops->datbuf && to + ops->len > mtd->size)
Thomas Gleixner8593fbc2006-05-29 03:26:58 +0200217 return -EINVAL;
Artem Bityutskiya2cc5ba2011-12-23 18:29:55 +0200218 return mtd_write_oob(part->master, to + part->offset, ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900221static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
222 size_t len, size_t *retlen, u_char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
224 struct mtd_part *part = PART(mtd);
Artem Bityutskiy482b43a2011-12-23 18:50:04 +0200225 return mtd_write_user_prot_reg(part->master, from, len, retlen, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226}
227
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900228static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
229 size_t len)
Nicolas Pitref77814d2005-02-08 17:11:19 +0000230{
231 struct mtd_part *part = PART(mtd);
Artem Bityutskiy4403dbfb2011-12-23 18:55:49 +0200232 return mtd_lock_user_prot_reg(part->master, from, len);
Nicolas Pitref77814d2005-02-08 17:11:19 +0000233}
234
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900235static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
236 unsigned long count, loff_t to, size_t *retlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
238 struct mtd_part *part = PART(mtd);
239 if (!(mtd->flags & MTD_WRITEABLE))
240 return -EROFS;
Artem Bityutskiyb0a31f72011-12-23 18:59:12 +0200241 return mtd_writev(part->master, vecs, count, to + part->offset,
242 retlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900245static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 struct mtd_part *part = PART(mtd);
248 int ret;
249 if (!(mtd->flags & MTD_WRITEABLE))
250 return -EROFS;
251 if (instr->addr >= mtd->size)
252 return -EINVAL;
253 instr->addr += part->offset;
Artem Bityutskiy7e1f0dc2011-12-23 15:25:39 +0200254 ret = mtd_erase(part->master, instr);
Adrian Hunter74641d72007-03-08 12:20:12 +0200255 if (ret) {
Adrian Hunterbb0eb212008-08-12 12:40:50 +0300256 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
Adrian Hunter74641d72007-03-08 12:20:12 +0200257 instr->fail_addr -= part->offset;
258 instr->addr -= part->offset;
259 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 return ret;
261}
262
263void mtd_erase_callback(struct erase_info *instr)
264{
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200265 if (instr->mtd->_erase == part_erase) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 struct mtd_part *part = PART(instr->mtd);
267
Adrian Hunterbb0eb212008-08-12 12:40:50 +0300268 if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 instr->fail_addr -= part->offset;
270 instr->addr -= part->offset;
271 }
272 if (instr->callback)
273 instr->callback(instr);
274}
275EXPORT_SYMBOL_GPL(mtd_erase_callback);
276
Adrian Hunter69423d92008-12-10 13:37:21 +0000277static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
279 struct mtd_part *part = PART(mtd);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000280 if ((len + ofs) > mtd->size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 return -EINVAL;
Artem Bityutskiy7799f9a2011-12-23 19:15:39 +0200282 return mtd_lock(part->master, ofs + part->offset, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
Adrian Hunter69423d92008-12-10 13:37:21 +0000285static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
287 struct mtd_part *part = PART(mtd);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000288 if ((len + ofs) > mtd->size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return -EINVAL;
Artem Bityutskiyb66005c2011-12-23 19:18:22 +0200290 return mtd_unlock(part->master, ofs + part->offset, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
Richard Cochran99384242010-06-14 18:10:33 +0200293static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
294{
295 struct mtd_part *part = PART(mtd);
296 if ((len + ofs) > mtd->size)
297 return -EINVAL;
Artem Bityutskiye95e9782011-12-23 19:21:16 +0200298 return mtd_is_locked(part->master, ofs + part->offset, len);
Richard Cochran99384242010-06-14 18:10:33 +0200299}
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301static void part_sync(struct mtd_info *mtd)
302{
303 struct mtd_part *part = PART(mtd);
Artem Bityutskiy85f2f2a2011-12-23 19:03:12 +0200304 mtd_sync(part->master);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305}
306
307static int part_suspend(struct mtd_info *mtd)
308{
309 struct mtd_part *part = PART(mtd);
Artem Bityutskiy3fe4bae2011-12-23 19:25:16 +0200310 return mtd_suspend(part->master);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311}
312
313static void part_resume(struct mtd_info *mtd)
314{
315 struct mtd_part *part = PART(mtd);
Artem Bityutskiyead995f2011-12-23 19:31:25 +0200316 mtd_resume(part->master);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900319static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
321 struct mtd_part *part = PART(mtd);
322 if (ofs >= mtd->size)
323 return -EINVAL;
324 ofs += part->offset;
Artem Bityutskiy7086c192011-12-23 19:35:30 +0200325 return mtd_block_isbad(part->master, ofs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900328static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329{
330 struct mtd_part *part = PART(mtd);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200331 int res;
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 if (!(mtd->flags & MTD_WRITEABLE))
334 return -EROFS;
335 if (ofs >= mtd->size)
336 return -EINVAL;
337 ofs += part->offset;
Artem Bityutskiy5942ddb2011-12-23 19:37:38 +0200338 res = mtd_block_markbad(part->master, ofs);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200339 if (!res)
340 mtd->ecc_stats.badblocks++;
341 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342}
343
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300344static inline void free_partition(struct mtd_part *p)
345{
346 kfree(p->mtd.name);
347 kfree(p);
348}
349
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000350/*
351 * This function unregisters and destroy all slave MTD objects which are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 * attached to the given master MTD object.
353 */
354
355int del_mtd_partitions(struct mtd_info *master)
356{
Chris Malley71a928c2008-05-19 20:11:50 +0100357 struct mtd_part *slave, *next;
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300358 int ret, err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300360 mutex_lock(&mtd_partitions_mutex);
Chris Malley71a928c2008-05-19 20:11:50 +0100361 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (slave->master == master) {
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300363 ret = del_mtd_device(&slave->mtd);
364 if (ret < 0) {
365 err = ret;
366 continue;
367 }
Chris Malley71a928c2008-05-19 20:11:50 +0100368 list_del(&slave->list);
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300369 free_partition(slave);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 }
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300371 mutex_unlock(&mtd_partitions_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300373 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
375
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300376static struct mtd_part *allocate_partition(struct mtd_info *master,
377 const struct mtd_partition *part, int partno,
378 uint64_t cur_offset)
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900379{
380 struct mtd_part *slave;
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300381 char *name;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900382
383 /* allocate the partition structure */
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900384 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300385 name = kstrdup(part->name, GFP_KERNEL);
386 if (!name || !slave) {
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900387 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300388 master->name);
389 kfree(name);
390 kfree(slave);
391 return ERR_PTR(-ENOMEM);
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900392 }
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900393
394 /* set up the MTD object for this partition */
395 slave->mtd.type = master->type;
396 slave->mtd.flags = master->flags & ~part->mask_flags;
397 slave->mtd.size = part->size;
398 slave->mtd.writesize = master->writesize;
Anatolij Gustschin7fa33ac2010-12-16 23:42:18 +0100399 slave->mtd.writebufsize = master->writebufsize;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900400 slave->mtd.oobsize = master->oobsize;
401 slave->mtd.oobavail = master->oobavail;
402 slave->mtd.subpage_sft = master->subpage_sft;
403
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300404 slave->mtd.name = name;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900405 slave->mtd.owner = master->owner;
David Howells402d3262009-02-12 10:40:00 +0000406 slave->mtd.backing_dev_info = master->backing_dev_info;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900407
David Brownell1f24b5a2009-03-26 00:42:41 -0700408 /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone
409 * to have the same data be in two different partitions.
410 */
411 slave->mtd.dev.parent = master->dev.parent;
412
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200413 slave->mtd._read = part_read;
414 slave->mtd._write = part_write;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900415
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200416 if (master->_panic_write)
417 slave->mtd._panic_write = part_panic_write;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900418
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200419 if (master->_point && master->_unpoint) {
420 slave->mtd._point = part_point;
421 slave->mtd._unpoint = part_unpoint;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900422 }
423
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200424 if (master->_get_unmapped_area)
425 slave->mtd._get_unmapped_area = part_get_unmapped_area;
426 if (master->_read_oob)
427 slave->mtd._read_oob = part_read_oob;
428 if (master->_write_oob)
429 slave->mtd._write_oob = part_write_oob;
430 if (master->_read_user_prot_reg)
431 slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
432 if (master->_read_fact_prot_reg)
433 slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
434 if (master->_write_user_prot_reg)
435 slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
436 if (master->_lock_user_prot_reg)
437 slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
438 if (master->_get_user_prot_info)
439 slave->mtd._get_user_prot_info = part_get_user_prot_info;
440 if (master->_get_fact_prot_info)
441 slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
442 if (master->_sync)
443 slave->mtd._sync = part_sync;
444 if (!partno && !master->dev.class && master->_suspend &&
445 master->_resume) {
446 slave->mtd._suspend = part_suspend;
447 slave->mtd._resume = part_resume;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900448 }
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200449 if (master->_writev)
450 slave->mtd._writev = part_writev;
451 if (master->_lock)
452 slave->mtd._lock = part_lock;
453 if (master->_unlock)
454 slave->mtd._unlock = part_unlock;
455 if (master->_is_locked)
456 slave->mtd._is_locked = part_is_locked;
457 if (master->_block_isbad)
458 slave->mtd._block_isbad = part_block_isbad;
459 if (master->_block_markbad)
460 slave->mtd._block_markbad = part_block_markbad;
461 slave->mtd._erase = part_erase;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900462 slave->master = master;
463 slave->offset = part->offset;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900464
465 if (slave->offset == MTDPART_OFS_APPEND)
466 slave->offset = cur_offset;
467 if (slave->offset == MTDPART_OFS_NXTBLK) {
468 slave->offset = cur_offset;
Adrian Hunter69423d92008-12-10 13:37:21 +0000469 if (mtd_mod_by_eb(cur_offset, master) != 0) {
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900470 /* Round up to next erasesize */
Adrian Hunter69423d92008-12-10 13:37:21 +0000471 slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900472 printk(KERN_NOTICE "Moving partition %d: "
Adrian Hunter69423d92008-12-10 13:37:21 +0000473 "0x%012llx -> 0x%012llx\n", partno,
474 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900475 }
476 }
Dmitry Eremin-Solenikov1a313682011-06-06 18:04:14 +0400477 if (slave->offset == MTDPART_OFS_RETAIN) {
478 slave->offset = cur_offset;
479 if (master->size - slave->offset >= slave->mtd.size) {
480 slave->mtd.size = master->size - slave->offset
481 - slave->mtd.size;
482 } else {
483 printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
484 part->name, master->size - slave->offset,
485 slave->mtd.size);
486 /* register to preserve ordering */
487 goto out_register;
488 }
489 }
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900490 if (slave->mtd.size == MTDPART_SIZ_FULL)
491 slave->mtd.size = master->size - slave->offset;
492
Adrian Hunter69423d92008-12-10 13:37:21 +0000493 printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
494 (unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900495
496 /* let's do some sanity checks */
497 if (slave->offset >= master->size) {
Atsushi Nemotof636ffb2008-07-19 01:01:22 +0900498 /* let's register it anyway to preserve ordering */
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900499 slave->offset = 0;
500 slave->mtd.size = 0;
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900501 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900502 part->name);
Atsushi Nemotof636ffb2008-07-19 01:01:22 +0900503 goto out_register;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900504 }
505 if (slave->offset + slave->mtd.size > master->size) {
506 slave->mtd.size = master->size - slave->offset;
Adrian Hunter69423d92008-12-10 13:37:21 +0000507 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
508 part->name, master->name, (unsigned long long)slave->mtd.size);
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900509 }
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900510 if (master->numeraseregions > 1) {
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900511 /* Deal with variable erase size stuff */
Atsushi Nemoto6910c132008-07-19 01:00:57 +0900512 int i, max = master->numeraseregions;
Adrian Hunter69423d92008-12-10 13:37:21 +0000513 u64 end = slave->offset + slave->mtd.size;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900514 struct mtd_erase_region_info *regions = master->eraseregions;
515
Atsushi Nemoto6910c132008-07-19 01:00:57 +0900516 /* Find the first erase regions which is part of this
517 * partition. */
518 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900519 ;
Atsushi Nemoto6910c132008-07-19 01:00:57 +0900520 /* The loop searched for the region _behind_ the first one */
Roel Kluina57ca042009-09-18 12:51:50 -0700521 if (i > 0)
522 i--;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900523
Atsushi Nemoto6910c132008-07-19 01:00:57 +0900524 /* Pick biggest erasesize */
525 for (; i < max && regions[i].offset < end; i++) {
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900526 if (slave->mtd.erasesize < regions[i].erasesize) {
527 slave->mtd.erasesize = regions[i].erasesize;
528 }
529 }
Atsushi Nemoto6910c132008-07-19 01:00:57 +0900530 BUG_ON(slave->mtd.erasesize == 0);
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900531 } else {
532 /* Single erase size */
533 slave->mtd.erasesize = master->erasesize;
534 }
535
536 if ((slave->mtd.flags & MTD_WRITEABLE) &&
Adrian Hunter69423d92008-12-10 13:37:21 +0000537 mtd_mod_by_eb(slave->offset, &slave->mtd)) {
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900538 /* Doesn't start on a boundary of major erase size */
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900539 /* FIXME: Let it be writable if it is on a boundary of
540 * _minor_ erase size though */
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900541 slave->mtd.flags &= ~MTD_WRITEABLE;
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900542 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900543 part->name);
544 }
545 if ((slave->mtd.flags & MTD_WRITEABLE) &&
Adrian Hunter69423d92008-12-10 13:37:21 +0000546 mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900547 slave->mtd.flags &= ~MTD_WRITEABLE;
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900548 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900549 part->name);
550 }
551
552 slave->mtd.ecclayout = master->ecclayout;
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200553 if (master->_block_isbad) {
Adrian Hunter69423d92008-12-10 13:37:21 +0000554 uint64_t offs = 0;
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900555
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900556 while (offs < slave->mtd.size) {
Artem Bityutskiy7086c192011-12-23 19:35:30 +0200557 if (mtd_block_isbad(master, offs + slave->offset))
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900558 slave->mtd.ecc_stats.badblocks++;
559 offs += slave->mtd.erasesize;
560 }
561 }
562
Atsushi Nemotof636ffb2008-07-19 01:01:22 +0900563out_register:
Atsushi Nemoto7788ba72008-07-19 01:00:18 +0900564 return slave;
565}
566
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300567int mtd_add_partition(struct mtd_info *master, char *name,
568 long long offset, long long length)
569{
570 struct mtd_partition part;
571 struct mtd_part *p, *new;
572 uint64_t start, end;
573 int ret = 0;
574
575 /* the direct offset is expected */
576 if (offset == MTDPART_OFS_APPEND ||
577 offset == MTDPART_OFS_NXTBLK)
578 return -EINVAL;
579
580 if (length == MTDPART_SIZ_FULL)
581 length = master->size - offset;
582
583 if (length <= 0)
584 return -EINVAL;
585
586 part.name = name;
587 part.size = length;
588 part.offset = offset;
589 part.mask_flags = 0;
590 part.ecclayout = NULL;
591
592 new = allocate_partition(master, &part, -1, offset);
593 if (IS_ERR(new))
594 return PTR_ERR(new);
595
596 start = offset;
597 end = offset + length;
598
599 mutex_lock(&mtd_partitions_mutex);
600 list_for_each_entry(p, &mtd_partitions, list)
601 if (p->master == master) {
602 if ((start >= p->offset) &&
603 (start < (p->offset + p->mtd.size)))
604 goto err_inv;
605
606 if ((end >= p->offset) &&
607 (end < (p->offset + p->mtd.size)))
608 goto err_inv;
609 }
610
611 list_add(&new->list, &mtd_partitions);
612 mutex_unlock(&mtd_partitions_mutex);
613
614 add_mtd_device(&new->mtd);
615
616 return ret;
617err_inv:
618 mutex_unlock(&mtd_partitions_mutex);
619 free_partition(new);
620 return -EINVAL;
621}
622EXPORT_SYMBOL_GPL(mtd_add_partition);
623
624int mtd_del_partition(struct mtd_info *master, int partno)
625{
626 struct mtd_part *slave, *next;
627 int ret = -EINVAL;
628
629 mutex_lock(&mtd_partitions_mutex);
630 list_for_each_entry_safe(slave, next, &mtd_partitions, list)
631 if ((slave->master == master) &&
632 (slave->mtd.index == partno)) {
633 ret = del_mtd_device(&slave->mtd);
634 if (ret < 0)
635 break;
636
637 list_del(&slave->list);
638 free_partition(slave);
639 break;
640 }
641 mutex_unlock(&mtd_partitions_mutex);
642
643 return ret;
644}
645EXPORT_SYMBOL_GPL(mtd_del_partition);
646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647/*
648 * This function, given a master MTD object and a partition table, creates
649 * and registers slave MTD objects which are bound to the master according to
650 * the partition definitions.
David Brownell1f24b5a2009-03-26 00:42:41 -0700651 *
652 * We don't register the master, or expect the caller to have done so,
653 * for reasons of data integrity.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 */
655
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000656int add_mtd_partitions(struct mtd_info *master,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 const struct mtd_partition *parts,
658 int nbparts)
659{
660 struct mtd_part *slave;
Adrian Hunter69423d92008-12-10 13:37:21 +0000661 uint64_t cur_offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 int i;
663
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900664 printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 for (i = 0; i < nbparts; i++) {
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300667 slave = allocate_partition(master, parts + i, i, cur_offset);
668 if (IS_ERR(slave))
669 return PTR_ERR(slave);
670
671 mutex_lock(&mtd_partitions_mutex);
672 list_add(&slave->list, &mtd_partitions);
673 mutex_unlock(&mtd_partitions_mutex);
674
675 add_mtd_device(&slave->mtd);
676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 cur_offset = slave->offset + slave->mtd.size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 }
679
680 return 0;
681}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
683static DEFINE_SPINLOCK(part_parser_lock);
684static LIST_HEAD(part_parsers);
685
686static struct mtd_part_parser *get_partition_parser(const char *name)
687{
Chris Malley71a928c2008-05-19 20:11:50 +0100688 struct mtd_part_parser *p, *ret = NULL;
689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 spin_lock(&part_parser_lock);
691
Chris Malley71a928c2008-05-19 20:11:50 +0100692 list_for_each_entry(p, &part_parsers, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
694 ret = p;
695 break;
696 }
Chris Malley71a928c2008-05-19 20:11:50 +0100697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 spin_unlock(&part_parser_lock);
699
700 return ret;
701}
702
Dmitry Eremin-Solenikov953b3bd2011-06-23 15:26:14 +0400703#define put_partition_parser(p) do { module_put((p)->owner); } while (0)
704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705int register_mtd_parser(struct mtd_part_parser *p)
706{
707 spin_lock(&part_parser_lock);
708 list_add(&p->list, &part_parsers);
709 spin_unlock(&part_parser_lock);
710
711 return 0;
712}
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900713EXPORT_SYMBOL_GPL(register_mtd_parser);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715int deregister_mtd_parser(struct mtd_part_parser *p)
716{
717 spin_lock(&part_parser_lock);
718 list_del(&p->list);
719 spin_unlock(&part_parser_lock);
720 return 0;
721}
Atsushi Nemotob33a2882008-07-19 01:00:33 +0900722EXPORT_SYMBOL_GPL(deregister_mtd_parser);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
Artem Bityutskiyad274ce2011-06-08 11:42:27 +0300724/*
725 * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
726 * are changing this array!
727 */
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400728static const char *default_mtd_part_types[] = {
729 "cmdlinepart",
730 "ofpart",
731 NULL
732};
Dmitry Eremin-Solenikov5c4eefb2011-06-02 18:51:16 +0400733
Artem Bityutskiyad274ce2011-06-08 11:42:27 +0300734/**
735 * parse_mtd_partitions - parse MTD partitions
736 * @master: the master partition (describes whole MTD device)
737 * @types: names of partition parsers to try or %NULL
738 * @pparts: array of partitions found is returned here
Dmitry Eremin-Solenikovc7975332011-06-10 18:18:28 +0400739 * @data: MTD partition parser-specific data
Artem Bityutskiyad274ce2011-06-08 11:42:27 +0300740 *
741 * This function tries to find partition on MTD device @master. It uses MTD
742 * partition parsers, specified in @types. However, if @types is %NULL, then
743 * the default list of parsers is used. The default list contains only the
Dmitry Eremin-Solenikovd26c87d2011-05-29 21:32:33 +0400744 * "cmdlinepart" and "ofpart" parsers ATM.
Artem Bityutskiyad274ce2011-06-08 11:42:27 +0300745 *
746 * This function may return:
747 * o a negative error code in case of failure
748 * o zero if no partitions were found
749 * o a positive number of found partitions, in which case on exit @pparts will
750 * point to an array containing this number of &struct mtd_info objects.
751 */
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000752int parse_mtd_partitions(struct mtd_info *master, const char **types,
Dmitry Eremin-Solenikovc7975332011-06-10 18:18:28 +0400753 struct mtd_partition **pparts,
754 struct mtd_part_parser_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
756 struct mtd_part_parser *parser;
757 int ret = 0;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000758
Dmitry Eremin-Solenikov5c4eefb2011-06-02 18:51:16 +0400759 if (!types)
760 types = default_mtd_part_types;
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 for ( ; ret <= 0 && *types; types++) {
763 parser = get_partition_parser(*types);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 if (!parser && !request_module("%s", *types))
Stefan Roese58edc902012-01-25 11:24:36 +0100765 parser = get_partition_parser(*types);
Artem Bityutskiy7c802fb2011-05-17 11:13:17 +0300766 if (!parser)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 continue;
Dmitry Eremin-Solenikovc7975332011-06-10 18:18:28 +0400768 ret = (*parser->parse_fn)(master, pparts, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 if (ret > 0) {
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000770 printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 ret, parser->name, master->name);
772 }
773 put_partition_parser(parser);
774 }
775 return ret;
776}
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300777
Roman Tereshonkova7e93dc2010-11-23 14:17:17 +0200778int mtd_is_partition(struct mtd_info *mtd)
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300779{
780 struct mtd_part *part;
Roman Tereshonkova7e93dc2010-11-23 14:17:17 +0200781 int ispart = 0;
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300782
783 mutex_lock(&mtd_partitions_mutex);
784 list_for_each_entry(part, &mtd_partitions, list)
785 if (&part->mtd == mtd) {
Roman Tereshonkova7e93dc2010-11-23 14:17:17 +0200786 ispart = 1;
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300787 break;
788 }
789 mutex_unlock(&mtd_partitions_mutex);
790
Roman Tereshonkova7e93dc2010-11-23 14:17:17 +0200791 return ispart;
Roman Tereshonkov5daa7b22010-09-17 13:31:41 +0300792}
Roman Tereshonkova7e93dc2010-11-23 14:17:17 +0200793EXPORT_SYMBOL_GPL(mtd_is_partition);