blob: 4119ea4ff6b058b88d03815b638a7710fa594d0a [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Kyungmin Parke29c22f2008-11-19 16:20:36 +01002/*
3 * Simple MTD partitioning layer
4 *
Heiko Schocherff94bc42014-06-24 10:10:04 +02005 * Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
6 * Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
7 * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
Kyungmin Parke29c22f2008-11-19 16:20:36 +01008 *
Kyungmin Parke29c22f2008-11-19 16:20:36 +01009 */
10
Heiko Schocherff94bc42014-06-24 10:10:04 +020011#ifndef __UBOOT__
Simon Glassf7ae49f2020-05-10 11:40:05 -060012#include <log.h>
Simon Glass61b29b82020-02-03 07:36:15 -070013#include <dm/devres.h>
Heiko Schocherff94bc42014-06-24 10:10:04 +020014#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
17#include <linux/slab.h>
18#include <linux/list.h>
19#include <linux/kmod.h>
20#endif
21
Kyungmin Parke29c22f2008-11-19 16:20:36 +010022#include <common.h>
23#include <malloc.h>
Simon Glasseb41d8a2020-05-10 11:40:08 -060024#include <linux/bug.h>
Masahiro Yamada1221ce42016-09-21 11:28:55 +090025#include <linux/errno.h>
Heiko Schocherff94bc42014-06-24 10:10:04 +020026#include <linux/compat.h>
27#include <ubi_uboot.h>
Kyungmin Parke29c22f2008-11-19 16:20:36 +010028
Kyungmin Parke29c22f2008-11-19 16:20:36 +010029#include <linux/mtd/mtd.h>
30#include <linux/mtd/partitions.h>
Heiko Schocherff94bc42014-06-24 10:10:04 +020031#include <linux/err.h>
Miquel Raynal21cc1fb2018-09-29 12:58:25 +020032#include <linux/sizes.h>
Heiko Schocherff94bc42014-06-24 10:10:04 +020033
34#include "mtdcore.h"
Kyungmin Parke29c22f2008-11-19 16:20:36 +010035
Heiko Schocherff94bc42014-06-24 10:10:04 +020036#ifndef __UBOOT__
37static DEFINE_MUTEX(mtd_partitions_mutex);
38#else
39DEFINE_MUTEX(mtd_partitions_mutex);
40#endif
Kyungmin Parke29c22f2008-11-19 16:20:36 +010041
Heiko Schocherff94bc42014-06-24 10:10:04 +020042#ifdef __UBOOT__
43/* from mm/util.c */
44
45/**
46 * kstrdup - allocate space for and copy an existing string
47 * @s: the string to duplicate
48 * @gfp: the GFP mask used in the kmalloc() call when allocating memory
49 */
50char *kstrdup(const char *s, gfp_t gfp)
51{
52 size_t len;
53 char *buf;
54
55 if (!s)
56 return NULL;
57
58 len = strlen(s) + 1;
59 buf = kmalloc(len, gfp);
60 if (buf)
61 memcpy(buf, s, len);
62 return buf;
63}
64#endif
65
Miquel Raynal21cc1fb2018-09-29 12:58:25 +020066#define MTD_SIZE_REMAINING (~0LLU)
67#define MTD_OFFSET_NOT_SPECIFIED (~0LLU)
68
Boris Brezillon4a5594f2018-12-02 10:54:30 +010069bool mtd_partitions_used(struct mtd_info *master)
70{
71 struct mtd_info *slave;
72
73 list_for_each_entry(slave, &master->partitions, node) {
74 if (slave->usecount)
75 return true;
76 }
77
78 return false;
79}
80
Miquel Raynal21cc1fb2018-09-29 12:58:25 +020081/**
82 * mtd_parse_partition - Parse @mtdparts partition definition, fill @partition
83 * with it and update the @mtdparts string pointer.
84 *
85 * The partition name is allocated and must be freed by the caller.
86 *
87 * This function is widely inspired from part_parse (mtdparts.c).
88 *
89 * @mtdparts: String describing the partition with mtdparts command syntax
90 * @partition: MTD partition structure to fill
91 *
Heinrich Schuchardt185f8122022-01-19 18:05:50 +010092 * Return: 0 on success, an error otherwise.
Miquel Raynal21cc1fb2018-09-29 12:58:25 +020093 */
94static int mtd_parse_partition(const char **_mtdparts,
95 struct mtd_partition *partition)
96{
97 const char *mtdparts = *_mtdparts;
98 const char *name = NULL;
99 int name_len;
100 char *buf;
101
102 /* Ensure the partition structure is empty */
103 memset(partition, 0, sizeof(struct mtd_partition));
104
105 /* Fetch the partition size */
106 if (*mtdparts == '-') {
107 /* Assign all remaining space to this partition */
108 partition->size = MTD_SIZE_REMAINING;
109 mtdparts++;
110 } else {
111 partition->size = ustrtoull(mtdparts, (char **)&mtdparts, 0);
112 if (partition->size < SZ_4K) {
113 printf("Minimum partition size 4kiB, %lldB requested\n",
114 partition->size);
115 return -EINVAL;
116 }
117 }
118
119 /* Check for the offset */
120 partition->offset = MTD_OFFSET_NOT_SPECIFIED;
121 if (*mtdparts == '@') {
122 mtdparts++;
123 partition->offset = ustrtoull(mtdparts, (char **)&mtdparts, 0);
124 }
125
126 /* Now look for the name */
127 if (*mtdparts == '(') {
128 name = ++mtdparts;
129 mtdparts = strchr(name, ')');
130 if (!mtdparts) {
131 printf("No closing ')' found in partition name\n");
132 return -EINVAL;
133 }
134 name_len = mtdparts - name + 1;
135 if ((name_len - 1) == 0) {
136 printf("Empty partition name\n");
137 return -EINVAL;
138 }
139 mtdparts++;
140 } else {
141 /* Name will be of the form size@offset */
142 name_len = 22;
143 }
144
145 /* Check if the partition is read-only */
146 if (strncmp(mtdparts, "ro", 2) == 0) {
147 partition->mask_flags |= MTD_WRITEABLE;
148 mtdparts += 2;
149 }
150
151 /* Check for a potential next partition definition */
152 if (*mtdparts == ',') {
153 if (partition->size == MTD_SIZE_REMAINING) {
154 printf("No partitions allowed after a fill-up\n");
155 return -EINVAL;
156 }
157 ++mtdparts;
158 } else if ((*mtdparts == ';') || (*mtdparts == '\0')) {
159 /* NOP */
160 } else {
161 printf("Unexpected character '%c' in mtdparts\n", *mtdparts);
162 return -EINVAL;
163 }
164
165 /*
166 * Allocate a buffer for the name and either copy the provided name or
167 * auto-generate it with the form 'size@offset'.
168 */
169 buf = malloc(name_len);
170 if (!buf)
171 return -ENOMEM;
172
173 if (name)
174 strncpy(buf, name, name_len - 1);
175 else
176 snprintf(buf, name_len, "0x%08llx@0x%08llx",
177 partition->size, partition->offset);
178
179 buf[name_len - 1] = '\0';
180 partition->name = buf;
181
182 *_mtdparts = mtdparts;
183
184 return 0;
185}
186
187/**
188 * mtd_parse_partitions - Create a partition array from an mtdparts definition
189 *
190 * Stateless function that takes a @parent MTD device, a string @_mtdparts
191 * describing the partitions (with the "mtdparts" command syntax) and creates
192 * the corresponding MTD partition structure array @_parts. Both the name and
193 * the structure partition itself must be freed freed, the caller may use
194 * @mtd_free_parsed_partitions() for this purpose.
195 *
196 * @parent: MTD device which contains the partitions
197 * @_mtdparts: Pointer to a string describing the partitions with "mtdparts"
198 * command syntax.
199 * @_parts: Allocated array containing the partitions, must be freed by the
200 * caller.
201 * @_nparts: Size of @_parts array.
202 *
Heinrich Schuchardt185f8122022-01-19 18:05:50 +0100203 * Return: 0 on success, an error otherwise.
Miquel Raynal21cc1fb2018-09-29 12:58:25 +0200204 */
205int mtd_parse_partitions(struct mtd_info *parent, const char **_mtdparts,
206 struct mtd_partition **_parts, int *_nparts)
207{
208 struct mtd_partition partition = {}, *parts;
209 const char *mtdparts = *_mtdparts;
Martin Kaistra892d4612020-07-13 14:40:02 +0200210 uint64_t cur_off = 0, cur_sz = 0;
Miquel Raynal21cc1fb2018-09-29 12:58:25 +0200211 int nparts = 0;
212 int ret, idx;
213 u64 sz;
214
215 /* First, iterate over the partitions until we know their number */
216 while (mtdparts[0] != '\0' && mtdparts[0] != ';') {
217 ret = mtd_parse_partition(&mtdparts, &partition);
218 if (ret)
219 return ret;
220
221 free((char *)partition.name);
222 nparts++;
223 }
224
225 /* Allocate an array of partitions to give back to the caller */
226 parts = malloc(sizeof(*parts) * nparts);
227 if (!parts) {
228 printf("Not enough space to save partitions meta-data\n");
229 return -ENOMEM;
230 }
231
232 /* Iterate again over each partition to save the data in our array */
233 for (idx = 0; idx < nparts; idx++) {
234 ret = mtd_parse_partition(_mtdparts, &parts[idx]);
235 if (ret)
236 return ret;
237
238 if (parts[idx].size == MTD_SIZE_REMAINING)
239 parts[idx].size = parent->size - cur_sz;
240 cur_sz += parts[idx].size;
241
242 sz = parts[idx].size;
243 if (sz < parent->writesize || do_div(sz, parent->writesize)) {
244 printf("Partition size must be a multiple of %d\n",
245 parent->writesize);
246 return -EINVAL;
247 }
248
249 if (parts[idx].offset == MTD_OFFSET_NOT_SPECIFIED)
250 parts[idx].offset = cur_off;
251 cur_off += parts[idx].size;
252
253 parts[idx].ecclayout = parent->ecclayout;
254 }
255
256 /* Offset by one mtdparts to point to the next device if any */
257 if (*_mtdparts[0] == ';')
258 (*_mtdparts)++;
259
260 *_parts = parts;
261 *_nparts = nparts;
262
263 return 0;
264}
265
266/**
267 * mtd_free_parsed_partitions - Free dynamically allocated partitions
268 *
269 * Each successful call to @mtd_parse_partitions must be followed by a call to
270 * @mtd_free_parsed_partitions to free any allocated array during the parsing
271 * process.
272 *
273 * @parts: Array containing the partitions that will be freed.
274 * @nparts: Size of @parts array.
275 */
276void mtd_free_parsed_partitions(struct mtd_partition *parts,
277 unsigned int nparts)
278{
279 int i;
280
281 for (i = 0; i < nparts; i++)
282 free((char *)parts[i].name);
283
284 free(parts);
285}
286
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100287/*
288 * MTD methods which simply translate the effective address and pass through
289 * to the _real_ device.
290 */
291
Stefan Roese8d2effe2009-05-11 16:03:55 +0200292static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
293 size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100294{
Stefan Roese8d2effe2009-05-11 16:03:55 +0200295 struct mtd_ecc_stats stats;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100296 int res;
297
Miquel Raynal2a749302018-09-29 12:58:27 +0200298 stats = mtd->parent->ecc_stats;
299 res = mtd->parent->_read(mtd->parent, from + mtd->offset, len,
300 retlen, buf);
Paul Burton40462e52013-09-04 15:16:56 +0100301 if (unlikely(mtd_is_eccerr(res)))
302 mtd->ecc_stats.failed +=
Miquel Raynal2a749302018-09-29 12:58:27 +0200303 mtd->parent->ecc_stats.failed - stats.failed;
Paul Burton40462e52013-09-04 15:16:56 +0100304 else
305 mtd->ecc_stats.corrected +=
Miquel Raynal2a749302018-09-29 12:58:27 +0200306 mtd->parent->ecc_stats.corrected - stats.corrected;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100307 return res;
308}
309
Heiko Schocherff94bc42014-06-24 10:10:04 +0200310#ifndef __UBOOT__
311static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
312 size_t *retlen, void **virt, resource_size_t *phys)
313{
Miquel Raynal2a749302018-09-29 12:58:27 +0200314 return mtd->parent->_point(mtd->parent, from + mtd->offset, len,
315 retlen, virt, phys);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200316}
317
318static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
319{
Miquel Raynal2a749302018-09-29 12:58:27 +0200320 return mtd->parent->_unpoint(mtd->parent, from + mtd->offset, len);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200321}
322#endif
323
324static unsigned long part_get_unmapped_area(struct mtd_info *mtd,
325 unsigned long len,
326 unsigned long offset,
327 unsigned long flags)
328{
Miquel Raynal2a749302018-09-29 12:58:27 +0200329 offset += mtd->offset;
330 return mtd->parent->_get_unmapped_area(mtd->parent, len, offset, flags);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200331}
332
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100333static int part_read_oob(struct mtd_info *mtd, loff_t from,
Stefan Roese8d2effe2009-05-11 16:03:55 +0200334 struct mtd_oob_ops *ops)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100335{
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100336 int res;
337
338 if (from >= mtd->size)
339 return -EINVAL;
340 if (ops->datbuf && from + ops->len > mtd->size)
341 return -EINVAL;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100342
Heiko Schocherff94bc42014-06-24 10:10:04 +0200343 /*
344 * If OOB is also requested, make sure that we do not read past the end
345 * of this partition.
346 */
347 if (ops->oobbuf) {
348 size_t len, pages;
349
350 if (ops->mode == MTD_OPS_AUTO_OOB)
351 len = mtd->oobavail;
352 else
353 len = mtd->oobsize;
354 pages = mtd_div_by_ws(mtd->size, mtd);
355 pages -= mtd_div_by_ws(from, mtd);
356 if (ops->ooboffs + ops->ooblen > pages * len)
357 return -EINVAL;
358 }
359
Miquel Raynal2a749302018-09-29 12:58:27 +0200360 res = mtd->parent->_read_oob(mtd->parent, from + mtd->offset, ops);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100361 if (unlikely(res)) {
Sergey Lapindfe64e22013-01-14 03:46:50 +0000362 if (mtd_is_bitflip(res))
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100363 mtd->ecc_stats.corrected++;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000364 if (mtd_is_eccerr(res))
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100365 mtd->ecc_stats.failed++;
366 }
367 return res;
368}
369
Stefan Roese8d2effe2009-05-11 16:03:55 +0200370static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
371 size_t len, size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100372{
Miquel Raynal2a749302018-09-29 12:58:27 +0200373 return mtd->parent->_read_user_prot_reg(mtd->parent, from, len,
374 retlen, buf);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100375}
376
Heiko Schocher4e67c572014-07-15 16:08:43 +0200377static int part_get_user_prot_info(struct mtd_info *mtd, size_t len,
378 size_t *retlen, struct otp_info *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100379{
Miquel Raynal2a749302018-09-29 12:58:27 +0200380 return mtd->parent->_get_user_prot_info(mtd->parent, len, retlen,
381 buf);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100382}
383
Stefan Roese8d2effe2009-05-11 16:03:55 +0200384static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
385 size_t len, size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100386{
Miquel Raynal2a749302018-09-29 12:58:27 +0200387 return mtd->parent->_read_fact_prot_reg(mtd->parent, from, len,
388 retlen, buf);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100389}
390
Heiko Schocher4e67c572014-07-15 16:08:43 +0200391static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len,
392 size_t *retlen, struct otp_info *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100393{
Miquel Raynal2a749302018-09-29 12:58:27 +0200394 return mtd->parent->_get_fact_prot_info(mtd->parent, len, retlen,
395 buf);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100396}
397
Stefan Roese8d2effe2009-05-11 16:03:55 +0200398static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
399 size_t *retlen, const u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100400{
Miquel Raynal2a749302018-09-29 12:58:27 +0200401 return mtd->parent->_write(mtd->parent, to + mtd->offset, len,
402 retlen, buf);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200403}
404
405static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
406 size_t *retlen, const u_char *buf)
407{
Miquel Raynal2a749302018-09-29 12:58:27 +0200408 return mtd->parent->_panic_write(mtd->parent, to + mtd->offset, len,
409 retlen, buf);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100410}
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100411
412static int part_write_oob(struct mtd_info *mtd, loff_t to,
Stefan Roese8d2effe2009-05-11 16:03:55 +0200413 struct mtd_oob_ops *ops)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100414{
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100415 if (to >= mtd->size)
416 return -EINVAL;
417 if (ops->datbuf && to + ops->len > mtd->size)
418 return -EINVAL;
Miquel Raynal2a749302018-09-29 12:58:27 +0200419 return mtd->parent->_write_oob(mtd->parent, to + mtd->offset, ops);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100420}
421
Stefan Roese8d2effe2009-05-11 16:03:55 +0200422static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
423 size_t len, size_t *retlen, u_char *buf)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100424{
Miquel Raynal2a749302018-09-29 12:58:27 +0200425 return mtd->parent->_write_user_prot_reg(mtd->parent, from, len,
426 retlen, buf);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100427}
428
Stefan Roese8d2effe2009-05-11 16:03:55 +0200429static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
430 size_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100431{
Miquel Raynal2a749302018-09-29 12:58:27 +0200432 return mtd->parent->_lock_user_prot_reg(mtd->parent, from, len);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100433}
434
Heiko Schocherff94bc42014-06-24 10:10:04 +0200435#ifndef __UBOOT__
436static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
437 unsigned long count, loff_t to, size_t *retlen)
438{
Miquel Raynal2a749302018-09-29 12:58:27 +0200439 return mtd->parent->_writev(mtd->parent, vecs, count,
440 to + mtd->offset, retlen);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200441}
442#endif
443
Stefan Roese8d2effe2009-05-11 16:03:55 +0200444static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100445{
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100446 int ret;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000447
Miquel Raynal2a749302018-09-29 12:58:27 +0200448 instr->addr += mtd->offset;
Marek Behúna60397d2021-10-05 15:56:05 +0200449
Miquel Raynal2a749302018-09-29 12:58:27 +0200450 ret = mtd->parent->_erase(mtd->parent, instr);
Marek Behúna60397d2021-10-05 15:56:05 +0200451 if (ret && instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
452 instr->fail_addr -= mtd->offset;
453
454 instr->addr -= mtd->offset;
455
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100456 return ret;
457}
458
Stefan Roese8d2effe2009-05-11 16:03:55 +0200459static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100460{
Miquel Raynal2a749302018-09-29 12:58:27 +0200461 return mtd->parent->_lock(mtd->parent, ofs + mtd->offset, len);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100462}
463
Stefan Roese8d2effe2009-05-11 16:03:55 +0200464static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100465{
Miquel Raynal2a749302018-09-29 12:58:27 +0200466 return mtd->parent->_unlock(mtd->parent, ofs + mtd->offset, len);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200467}
468
469static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
470{
Miquel Raynal2a749302018-09-29 12:58:27 +0200471 return mtd->parent->_is_locked(mtd->parent, ofs + mtd->offset, len);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100472}
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100473
474static void part_sync(struct mtd_info *mtd)
475{
Miquel Raynal2a749302018-09-29 12:58:27 +0200476 mtd->parent->_sync(mtd->parent);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100477}
478
Heiko Schocherff94bc42014-06-24 10:10:04 +0200479#ifndef __UBOOT__
480static int part_suspend(struct mtd_info *mtd)
481{
Miquel Raynal2a749302018-09-29 12:58:27 +0200482 return mtd->parent->_suspend(mtd->parent);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200483}
484
485static void part_resume(struct mtd_info *mtd)
486{
Miquel Raynal2a749302018-09-29 12:58:27 +0200487 mtd->parent->_resume(mtd->parent);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200488}
489#endif
490
Ezequiel Garcia86a720a2014-05-21 19:06:12 -0300491static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
492{
Miquel Raynal2a749302018-09-29 12:58:27 +0200493 ofs += mtd->offset;
494 return mtd->parent->_block_isreserved(mtd->parent, ofs);
Ezequiel Garcia86a720a2014-05-21 19:06:12 -0300495}
496
Stefan Roese8d2effe2009-05-11 16:03:55 +0200497static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100498{
Miquel Raynal2a749302018-09-29 12:58:27 +0200499 ofs += mtd->offset;
500 return mtd->parent->_block_isbad(mtd->parent, ofs);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100501}
502
Stefan Roese8d2effe2009-05-11 16:03:55 +0200503static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100504{
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100505 int res;
506
Miquel Raynal2a749302018-09-29 12:58:27 +0200507 ofs += mtd->offset;
508 res = mtd->parent->_block_markbad(mtd->parent, ofs);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100509 if (!res)
510 mtd->ecc_stats.badblocks++;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100511 return res;
512}
513
Miquel Raynal2a749302018-09-29 12:58:27 +0200514static inline void free_partition(struct mtd_info *p)
Heiko Schocherff94bc42014-06-24 10:10:04 +0200515{
Miquel Raynal2a749302018-09-29 12:58:27 +0200516 kfree(p->name);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200517 kfree(p);
518}
519
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100520/*
521 * This function unregisters and destroy all slave MTD objects which are
Miquel Raynal2a749302018-09-29 12:58:27 +0200522 * attached to the given master MTD object, recursively.
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100523 */
Miquel Raynal2a749302018-09-29 12:58:27 +0200524static int do_del_mtd_partitions(struct mtd_info *master)
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100525{
Miquel Raynal2a749302018-09-29 12:58:27 +0200526 struct mtd_info *slave, *next;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200527 int ret, err = 0;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100528
Miquel Raynal2a749302018-09-29 12:58:27 +0200529 list_for_each_entry_safe(slave, next, &master->partitions, node) {
530 if (mtd_has_partitions(slave))
531 del_mtd_partitions(slave);
Miquel Raynalb0036f72018-08-16 17:30:19 +0200532
Miquel Raynal2a749302018-09-29 12:58:27 +0200533 debug("Deleting %s MTD partition\n", slave->name);
534 ret = del_mtd_device(slave);
535 if (ret < 0) {
536 printf("Error when deleting partition \"%s\" (%d)\n",
537 slave->name, ret);
538 err = ret;
539 continue;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200540 }
Miquel Raynal2a749302018-09-29 12:58:27 +0200541
542 list_del(&slave->node);
543 free_partition(slave);
544 }
Stefan Roese8d2effe2009-05-11 16:03:55 +0200545
Heiko Schocherff94bc42014-06-24 10:10:04 +0200546 return err;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200547}
548
Miquel Raynal2a749302018-09-29 12:58:27 +0200549int del_mtd_partitions(struct mtd_info *master)
Stefan Roese8d2effe2009-05-11 16:03:55 +0200550{
Miquel Raynal2a749302018-09-29 12:58:27 +0200551 int ret;
552
553 debug("Deleting MTD partitions on \"%s\":\n", master->name);
554
555 mutex_lock(&mtd_partitions_mutex);
556 ret = do_del_mtd_partitions(master);
557 mutex_unlock(&mtd_partitions_mutex);
558
559 return ret;
560}
561
562static struct mtd_info *allocate_partition(struct mtd_info *master,
563 const struct mtd_partition *part,
564 int partno, uint64_t cur_offset)
565{
566 struct mtd_info *slave;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200567 char *name;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200568
569 /* allocate the partition structure */
570 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200571 name = kstrdup(part->name, GFP_KERNEL);
572 if (!name || !slave) {
Stefan Roese8d2effe2009-05-11 16:03:55 +0200573 printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
Heiko Schocherff94bc42014-06-24 10:10:04 +0200574 master->name);
575 kfree(name);
576 kfree(slave);
577 return ERR_PTR(-ENOMEM);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200578 }
Stefan Roese8d2effe2009-05-11 16:03:55 +0200579
580 /* set up the MTD object for this partition */
Miquel Raynal2a749302018-09-29 12:58:27 +0200581 slave->type = master->type;
582 slave->flags = master->flags & ~part->mask_flags;
583 slave->size = part->size;
584 slave->writesize = master->writesize;
585 slave->writebufsize = master->writebufsize;
586 slave->oobsize = master->oobsize;
587 slave->oobavail = master->oobavail;
588 slave->subpage_sft = master->subpage_sft;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200589
Miquel Raynal2a749302018-09-29 12:58:27 +0200590 slave->name = name;
591 slave->owner = master->owner;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200592#ifndef __UBOOT__
Miquel Raynal2a749302018-09-29 12:58:27 +0200593 slave->backing_dev_info = master->backing_dev_info;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200594
595 /* NOTE: we don't arrange MTDs as a tree; it'd be error-prone
596 * to have the same data be in two different partitions.
597 */
Miquel Raynal2a749302018-09-29 12:58:27 +0200598 slave->dev.parent = master->dev.parent;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200599#endif
Stefan Roese8d2effe2009-05-11 16:03:55 +0200600
Boris Brezillon596cf082018-08-16 17:29:59 +0200601 if (master->_read)
Miquel Raynal2a749302018-09-29 12:58:27 +0200602 slave->_read = part_read;
Boris Brezillon596cf082018-08-16 17:29:59 +0200603 if (master->_write)
Miquel Raynal2a749302018-09-29 12:58:27 +0200604 slave->_write = part_write;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200605
Heiko Schocherff94bc42014-06-24 10:10:04 +0200606 if (master->_panic_write)
Miquel Raynal2a749302018-09-29 12:58:27 +0200607 slave->_panic_write = part_panic_write;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200608
609#ifndef __UBOOT__
610 if (master->_point && master->_unpoint) {
Miquel Raynal2a749302018-09-29 12:58:27 +0200611 slave->_point = part_point;
612 slave->_unpoint = part_unpoint;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200613 }
614#endif
615
616 if (master->_get_unmapped_area)
Miquel Raynal2a749302018-09-29 12:58:27 +0200617 slave->_get_unmapped_area = part_get_unmapped_area;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000618 if (master->_read_oob)
Miquel Raynal2a749302018-09-29 12:58:27 +0200619 slave->_read_oob = part_read_oob;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000620 if (master->_write_oob)
Miquel Raynal2a749302018-09-29 12:58:27 +0200621 slave->_write_oob = part_write_oob;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000622 if (master->_read_user_prot_reg)
Miquel Raynal2a749302018-09-29 12:58:27 +0200623 slave->_read_user_prot_reg = part_read_user_prot_reg;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000624 if (master->_read_fact_prot_reg)
Miquel Raynal2a749302018-09-29 12:58:27 +0200625 slave->_read_fact_prot_reg = part_read_fact_prot_reg;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000626 if (master->_write_user_prot_reg)
Miquel Raynal2a749302018-09-29 12:58:27 +0200627 slave->_write_user_prot_reg = part_write_user_prot_reg;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000628 if (master->_lock_user_prot_reg)
Miquel Raynal2a749302018-09-29 12:58:27 +0200629 slave->_lock_user_prot_reg = part_lock_user_prot_reg;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000630 if (master->_get_user_prot_info)
Miquel Raynal2a749302018-09-29 12:58:27 +0200631 slave->_get_user_prot_info = part_get_user_prot_info;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000632 if (master->_get_fact_prot_info)
Miquel Raynal2a749302018-09-29 12:58:27 +0200633 slave->_get_fact_prot_info = part_get_fact_prot_info;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000634 if (master->_sync)
Miquel Raynal2a749302018-09-29 12:58:27 +0200635 slave->_sync = part_sync;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200636#ifndef __UBOOT__
637 if (!partno && !master->dev.class && master->_suspend &&
638 master->_resume) {
Miquel Raynal2a749302018-09-29 12:58:27 +0200639 slave->_suspend = part_suspend;
640 slave->_resume = part_resume;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200641 }
642 if (master->_writev)
Miquel Raynal2a749302018-09-29 12:58:27 +0200643 slave->_writev = part_writev;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200644#endif
Sergey Lapindfe64e22013-01-14 03:46:50 +0000645 if (master->_lock)
Miquel Raynal2a749302018-09-29 12:58:27 +0200646 slave->_lock = part_lock;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000647 if (master->_unlock)
Miquel Raynal2a749302018-09-29 12:58:27 +0200648 slave->_unlock = part_unlock;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200649 if (master->_is_locked)
Miquel Raynal2a749302018-09-29 12:58:27 +0200650 slave->_is_locked = part_is_locked;
Ezequiel Garcia86a720a2014-05-21 19:06:12 -0300651 if (master->_block_isreserved)
Miquel Raynal2a749302018-09-29 12:58:27 +0200652 slave->_block_isreserved = part_block_isreserved;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000653 if (master->_block_isbad)
Miquel Raynal2a749302018-09-29 12:58:27 +0200654 slave->_block_isbad = part_block_isbad;
Sergey Lapindfe64e22013-01-14 03:46:50 +0000655 if (master->_block_markbad)
Miquel Raynal2a749302018-09-29 12:58:27 +0200656 slave->_block_markbad = part_block_markbad;
657 slave->_erase = part_erase;
658 slave->parent = master;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200659 slave->offset = part->offset;
Miquel Raynal2a749302018-09-29 12:58:27 +0200660 INIT_LIST_HEAD(&slave->partitions);
661 INIT_LIST_HEAD(&slave->node);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200662
663 if (slave->offset == MTDPART_OFS_APPEND)
664 slave->offset = cur_offset;
665 if (slave->offset == MTDPART_OFS_NXTBLK) {
666 slave->offset = cur_offset;
667 if (mtd_mod_by_eb(cur_offset, master) != 0) {
668 /* Round up to next erasesize */
669 slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200670 debug("Moving partition %d: "
671 "0x%012llx -> 0x%012llx\n", partno,
672 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
673 }
674 }
675 if (slave->offset == MTDPART_OFS_RETAIN) {
676 slave->offset = cur_offset;
Miquel Raynal2a749302018-09-29 12:58:27 +0200677 if (master->size - slave->offset >= slave->size) {
678 slave->size = master->size - slave->offset
679 - slave->size;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200680 } else {
681 debug("mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
682 part->name, master->size - slave->offset,
Miquel Raynal2a749302018-09-29 12:58:27 +0200683 slave->size);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200684 /* register to preserve ordering */
685 goto out_register;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200686 }
687 }
Miquel Raynal2a749302018-09-29 12:58:27 +0200688 if (slave->size == MTDPART_SIZ_FULL)
689 slave->size = master->size - slave->offset;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200690
Heiko Schocherff94bc42014-06-24 10:10:04 +0200691 debug("0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
Miquel Raynal2a749302018-09-29 12:58:27 +0200692 (unsigned long long)(slave->offset + slave->size), slave->name);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200693
694 /* let's do some sanity checks */
695 if (slave->offset >= master->size) {
696 /* let's register it anyway to preserve ordering */
697 slave->offset = 0;
Miquel Raynal2a749302018-09-29 12:58:27 +0200698 slave->size = 0;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200699 printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
700 part->name);
701 goto out_register;
702 }
Miquel Raynal2a749302018-09-29 12:58:27 +0200703 if (slave->offset + slave->size > master->size) {
704 slave->size = master->size - slave->offset;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200705 printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
Miquel Raynal2a749302018-09-29 12:58:27 +0200706 part->name, master->name, slave->size);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200707 }
708 if (master->numeraseregions > 1) {
709 /* Deal with variable erase size stuff */
710 int i, max = master->numeraseregions;
Miquel Raynal2a749302018-09-29 12:58:27 +0200711 u64 end = slave->offset + slave->size;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200712 struct mtd_erase_region_info *regions = master->eraseregions;
713
714 /* Find the first erase regions which is part of this
715 * partition. */
716 for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
717 ;
718 /* The loop searched for the region _behind_ the first one */
Heiko Schocherff94bc42014-06-24 10:10:04 +0200719 if (i > 0)
720 i--;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200721
722 /* Pick biggest erasesize */
723 for (; i < max && regions[i].offset < end; i++) {
Miquel Raynal2a749302018-09-29 12:58:27 +0200724 if (slave->erasesize < regions[i].erasesize)
725 slave->erasesize = regions[i].erasesize;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200726 }
Miquel Raynal2a749302018-09-29 12:58:27 +0200727 WARN_ON(slave->erasesize == 0);
Stefan Roese8d2effe2009-05-11 16:03:55 +0200728 } else {
729 /* Single erase size */
Miquel Raynal2a749302018-09-29 12:58:27 +0200730 slave->erasesize = master->erasesize;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200731 }
732
Miquel Raynal2a749302018-09-29 12:58:27 +0200733 if ((slave->flags & MTD_WRITEABLE) &&
734 mtd_mod_by_eb(slave->offset, slave)) {
Stefan Roese8d2effe2009-05-11 16:03:55 +0200735 /* Doesn't start on a boundary of major erase size */
736 /* FIXME: Let it be writable if it is on a boundary of
737 * _minor_ erase size though */
Miquel Raynal2a749302018-09-29 12:58:27 +0200738 slave->flags &= ~MTD_WRITEABLE;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200739 printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
740 part->name);
741 }
Miquel Raynal2a749302018-09-29 12:58:27 +0200742 if ((slave->flags & MTD_WRITEABLE) &&
743 mtd_mod_by_eb(slave->size, slave)) {
744 slave->flags &= ~MTD_WRITEABLE;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200745 printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
746 part->name);
747 }
748
Miquel Raynal2a749302018-09-29 12:58:27 +0200749 slave->ecclayout = master->ecclayout;
750 slave->ecc_step_size = master->ecc_step_size;
751 slave->ecc_strength = master->ecc_strength;
752 slave->bitflip_threshold = master->bitflip_threshold;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200753
Sergey Lapindfe64e22013-01-14 03:46:50 +0000754 if (master->_block_isbad) {
Stefan Roese8d2effe2009-05-11 16:03:55 +0200755 uint64_t offs = 0;
756
Miquel Raynal2a749302018-09-29 12:58:27 +0200757 while (offs < slave->size) {
Sergey Lapindfe64e22013-01-14 03:46:50 +0000758 if (mtd_block_isbad(master, offs + slave->offset))
Miquel Raynal2a749302018-09-29 12:58:27 +0200759 slave->ecc_stats.badblocks++;
760 offs += slave->erasesize;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100761 }
762 }
763
Stefan Roese8d2effe2009-05-11 16:03:55 +0200764out_register:
Stefan Roese8d2effe2009-05-11 16:03:55 +0200765 return slave;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100766}
767
Heiko Schocherddf7bcf2014-07-15 16:08:42 +0200768#ifndef __UBOOT__
Heiko Schocherff94bc42014-06-24 10:10:04 +0200769int mtd_add_partition(struct mtd_info *master, const char *name,
770 long long offset, long long length)
771{
772 struct mtd_partition part;
Miquel Raynal2a749302018-09-29 12:58:27 +0200773 struct mtd_info *p, *new;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200774 uint64_t start, end;
775 int ret = 0;
776
777 /* the direct offset is expected */
778 if (offset == MTDPART_OFS_APPEND ||
779 offset == MTDPART_OFS_NXTBLK)
780 return -EINVAL;
781
782 if (length == MTDPART_SIZ_FULL)
783 length = master->size - offset;
784
785 if (length <= 0)
786 return -EINVAL;
787
788 part.name = name;
789 part.size = length;
790 part.offset = offset;
791 part.mask_flags = 0;
792 part.ecclayout = NULL;
793
794 new = allocate_partition(master, &part, -1, offset);
795 if (IS_ERR(new))
796 return PTR_ERR(new);
797
798 start = offset;
799 end = offset + length;
800
801 mutex_lock(&mtd_partitions_mutex);
Miquel Raynal2a749302018-09-29 12:58:27 +0200802 list_for_each_entry(p, &master->partitions, node) {
803 if (start >= p->offset &&
804 (start < (p->offset + p->size)))
805 goto err_inv;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200806
Miquel Raynal2a749302018-09-29 12:58:27 +0200807 if (end >= p->offset &&
808 (end < (p->offset + p->size)))
809 goto err_inv;
810 }
Heiko Schocherff94bc42014-06-24 10:10:04 +0200811
Miquel Raynal2a749302018-09-29 12:58:27 +0200812 list_add_tail(&new->node, &master->partitions);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200813 mutex_unlock(&mtd_partitions_mutex);
814
Miquel Raynal2a749302018-09-29 12:58:27 +0200815 add_mtd_device(new);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200816
817 return ret;
818err_inv:
819 mutex_unlock(&mtd_partitions_mutex);
820 free_partition(new);
821 return -EINVAL;
822}
823EXPORT_SYMBOL_GPL(mtd_add_partition);
824
825int mtd_del_partition(struct mtd_info *master, int partno)
826{
Miquel Raynal2a749302018-09-29 12:58:27 +0200827 struct mtd_info *slave, *next;
Heiko Schocherff94bc42014-06-24 10:10:04 +0200828 int ret = -EINVAL;
829
830 mutex_lock(&mtd_partitions_mutex);
Miquel Raynal2a749302018-09-29 12:58:27 +0200831 list_for_each_entry_safe(slave, next, &master->partitions, node)
832 if (slave->index == partno) {
833 ret = del_mtd_device(slave);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200834 if (ret < 0)
835 break;
836
Miquel Raynal2a749302018-09-29 12:58:27 +0200837 list_del(&slave->node);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200838 free_partition(slave);
839 break;
840 }
841 mutex_unlock(&mtd_partitions_mutex);
842
843 return ret;
844}
845EXPORT_SYMBOL_GPL(mtd_del_partition);
Heiko Schocherddf7bcf2014-07-15 16:08:42 +0200846#endif
Heiko Schocherff94bc42014-06-24 10:10:04 +0200847
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100848/*
849 * This function, given a master MTD object and a partition table, creates
850 * and registers slave MTD objects which are bound to the master according to
851 * the partition definitions.
Stefan Roese8d2effe2009-05-11 16:03:55 +0200852 *
853 * We don't register the master, or expect the caller to have done so,
854 * for reasons of data integrity.
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100855 */
856
857int add_mtd_partitions(struct mtd_info *master,
858 const struct mtd_partition *parts,
859 int nbparts)
860{
Miquel Raynal2a749302018-09-29 12:58:27 +0200861 struct mtd_info *slave;
Stefan Roese8d2effe2009-05-11 16:03:55 +0200862 uint64_t cur_offset = 0;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100863 int i;
864
Joe Hershberger147162d2013-04-08 10:32:49 +0000865 debug("Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100866
867 for (i = 0; i < nbparts; i++) {
Heiko Schocherff94bc42014-06-24 10:10:04 +0200868 slave = allocate_partition(master, parts + i, i, cur_offset);
869 if (IS_ERR(slave))
870 return PTR_ERR(slave);
871
872 mutex_lock(&mtd_partitions_mutex);
Miquel Raynal2a749302018-09-29 12:58:27 +0200873 list_add_tail(&slave->node, &master->partitions);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200874 mutex_unlock(&mtd_partitions_mutex);
875
Miquel Raynal2a749302018-09-29 12:58:27 +0200876 add_mtd_device(slave);
Heiko Schocherff94bc42014-06-24 10:10:04 +0200877
Miquel Raynal2a749302018-09-29 12:58:27 +0200878 cur_offset = slave->offset + slave->size;
Kyungmin Parke29c22f2008-11-19 16:20:36 +0100879 }
880
881 return 0;
882}
Heiko Schocherff94bc42014-06-24 10:10:04 +0200883
Marek Behúndc339bf2021-05-26 14:08:19 +0200884#if CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(OF_CONTROL)
885int add_mtd_partitions_of(struct mtd_info *master)
886{
887 ofnode parts, child;
888 int i = 0;
889
890 if (!master->dev)
891 return 0;
892
893 parts = ofnode_find_subnode(mtd_get_ofnode(master), "partitions");
894 if (!ofnode_valid(parts) || !ofnode_is_available(parts) ||
895 !ofnode_device_is_compatible(parts, "fixed-partitions"))
896 return 0;
897
898 ofnode_for_each_subnode(child, parts) {
899 struct mtd_partition part = { 0 };
900 struct mtd_info *slave;
901 fdt_addr_t offset, size;
902
903 if (!ofnode_is_available(child))
904 continue;
905
906 offset = ofnode_get_addr_size_index_notrans(child, 0, &size);
907 if (offset == FDT_ADDR_T_NONE || !size) {
908 debug("Missing partition offset/size on \"%s\" partition\n",
909 master->name);
910 continue;
911 }
912
913 part.name = ofnode_read_string(child, "label");
914 if (!part.name)
915 part.name = ofnode_read_string(child, "name");
916
917 /*
918 * .mask_flags is used to remove flags in allocate_partition(),
919 * so when "read-only" is present, we add MTD_WRITABLE to the
920 * mask, and so MTD_WRITABLE will be removed on partition
921 * allocation
922 */
923 if (ofnode_read_bool(child, "read-only"))
924 part.mask_flags |= MTD_WRITEABLE;
925 if (ofnode_read_bool(child, "lock"))
926 part.mask_flags |= MTD_POWERUP_LOCK;
927
928 part.offset = offset;
929 part.size = size;
930 part.ecclayout = master->ecclayout;
931
932 slave = allocate_partition(master, &part, i++, 0);
933 if (IS_ERR(slave))
934 return PTR_ERR(slave);
935
936 mutex_lock(&mtd_partitions_mutex);
937 list_add_tail(&slave->node, &master->partitions);
938 mutex_unlock(&mtd_partitions_mutex);
939
940 add_mtd_device(slave);
941 }
942
943 return 0;
944}
945#endif /* CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(OF_CONTROL) */
946
Heiko Schocherff94bc42014-06-24 10:10:04 +0200947#ifndef __UBOOT__
948static DEFINE_SPINLOCK(part_parser_lock);
949static LIST_HEAD(part_parsers);
950
951static struct mtd_part_parser *get_partition_parser(const char *name)
952{
953 struct mtd_part_parser *p, *ret = NULL;
954
955 spin_lock(&part_parser_lock);
956
957 list_for_each_entry(p, &part_parsers, list)
958 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
959 ret = p;
960 break;
961 }
962
963 spin_unlock(&part_parser_lock);
964
965 return ret;
966}
967
968#define put_partition_parser(p) do { module_put((p)->owner); } while (0)
969
970void register_mtd_parser(struct mtd_part_parser *p)
971{
972 spin_lock(&part_parser_lock);
973 list_add(&p->list, &part_parsers);
974 spin_unlock(&part_parser_lock);
975}
976EXPORT_SYMBOL_GPL(register_mtd_parser);
977
978void deregister_mtd_parser(struct mtd_part_parser *p)
979{
980 spin_lock(&part_parser_lock);
981 list_del(&p->list);
982 spin_unlock(&part_parser_lock);
983}
984EXPORT_SYMBOL_GPL(deregister_mtd_parser);
985
986/*
987 * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
988 * are changing this array!
989 */
990static const char * const default_mtd_part_types[] = {
991 "cmdlinepart",
992 "ofpart",
993 NULL
994};
995
996/**
997 * parse_mtd_partitions - parse MTD partitions
998 * @master: the master partition (describes whole MTD device)
999 * @types: names of partition parsers to try or %NULL
1000 * @pparts: array of partitions found is returned here
1001 * @data: MTD partition parser-specific data
1002 *
1003 * This function tries to find partition on MTD device @master. It uses MTD
1004 * partition parsers, specified in @types. However, if @types is %NULL, then
1005 * the default list of parsers is used. The default list contains only the
1006 * "cmdlinepart" and "ofpart" parsers ATM.
1007 * Note: If there are more then one parser in @types, the kernel only takes the
1008 * partitions parsed out by the first parser.
1009 *
1010 * This function may return:
1011 * o a negative error code in case of failure
1012 * o zero if no partitions were found
1013 * o a positive number of found partitions, in which case on exit @pparts will
1014 * point to an array containing this number of &struct mtd_info objects.
1015 */
1016int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
1017 struct mtd_partition **pparts,
1018 struct mtd_part_parser_data *data)
1019{
1020 struct mtd_part_parser *parser;
1021 int ret = 0;
1022
1023 if (!types)
1024 types = default_mtd_part_types;
1025
1026 for ( ; ret <= 0 && *types; types++) {
1027 parser = get_partition_parser(*types);
1028 if (!parser && !request_module("%s", *types))
1029 parser = get_partition_parser(*types);
1030 if (!parser)
1031 continue;
1032 ret = (*parser->parse_fn)(master, pparts, data);
1033 put_partition_parser(parser);
1034 if (ret > 0) {
1035 printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
1036 ret, parser->name, master->name);
1037 break;
1038 }
1039 }
1040 return ret;
1041}
1042#endif
1043
Heiko Schocherff94bc42014-06-24 10:10:04 +02001044/* Returns the size of the entire flash chip */
1045uint64_t mtd_get_device_size(const struct mtd_info *mtd)
1046{
Miquel Raynal2a749302018-09-29 12:58:27 +02001047 if (mtd_is_partition(mtd))
1048 return mtd->parent->size;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001049
Miquel Raynal2a749302018-09-29 12:58:27 +02001050 return mtd->size;
Heiko Schocherff94bc42014-06-24 10:10:04 +02001051}
1052EXPORT_SYMBOL_GPL(mtd_get_device_size);