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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Read flash partition table from command line
3 *
David Woodhousea1452a32010-08-08 20:58:20 +01004 * Copyright © 2002 SYSGO Real-Time Solutions GmbH
5 * Copyright © 2002-2010 David Woodhouse <dwmw2@infradead.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 *
21 * The format for the command line is as follows:
Thomas Gleixner97894cd2005-11-07 11:15:26 +000022 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 * mtdparts=<mtddef>[;<mtddef]
24 * <mtddef> := <mtd-id>:<partdef>[,<partdef>]
Christopher Cordahiea8b8e22012-12-18 16:11:51 -050025 * <partdef> := <size>[@<offset>][<name>][ro][lk]
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 * <mtd-id> := unique name used in mapping driver/device (mtd->name)
27 * <size> := standard linux memsize OR "-" to denote all remaining space
Christopher Cordahiea8b8e22012-12-18 16:11:51 -050028 * size is automatically truncated at end of device
29 * if specified or trucated size is 0 the part is skipped
30 * <offset> := standard linux memsize
31 * if omitted the part will immediately follow the previous part
32 * or 0 if the first part
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 * <name> := '(' NAME ')'
Christopher Cordahibd6ce5e2012-12-18 16:11:52 -050034 * NAME will appear in /proc/mtd
Thomas Gleixner97894cd2005-11-07 11:15:26 +000035 *
Christopher Cordahiea8b8e22012-12-18 16:11:51 -050036 * <size> and <offset> can be specified such that the parts are out of order
37 * in physical memory and may even overlap.
38 *
39 * The parts are assigned MTD numbers in the order they are specified in the
40 * command line regardless of their order in physical memory.
41 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 * Examples:
Thomas Gleixner97894cd2005-11-07 11:15:26 +000043 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 * 1 NOR Flash, with 1 single writable partition:
45 * edb7312-nor:-
Thomas Gleixner97894cd2005-11-07 11:15:26 +000046 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 * 1 NOR Flash with 2 partitions, 1 NAND with one
48 * edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home)
49 */
50
51#include <linux/kernel.h>
52#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <linux/mtd/mtd.h>
54#include <linux/mtd/partitions.h>
Paul Gortmakera0e5cc52011-07-03 15:17:31 -040055#include <linux/module.h>
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +030056#include <linux/err.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58/* error message prefix */
59#define ERRP "mtd: "
60
61/* debug macro */
62#if 0
63#define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0)
64#else
65#define dbg(x)
66#endif
67
68
69/* special size referring to all the remaining space in a partition */
Huang Shijie6f9f59e2012-11-01 13:58:17 +080070#define SIZE_REMAINING ULLONG_MAX
71#define OFFSET_CONTINUOUS ULLONG_MAX
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73struct cmdline_mtd_partition {
74 struct cmdline_mtd_partition *next;
75 char *mtd_id;
76 int num_parts;
77 struct mtd_partition *parts;
78};
79
80/* mtdpart_setup() parses into here */
81static struct cmdline_mtd_partition *partitions;
82
Peter Meerwald8abc0d42012-04-25 15:14:17 +020083/* the command line passed to mtdpart_setup() */
Lubomir Rintelf5f172d2013-01-16 02:12:49 +010084static char *mtdparts;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085static char *cmdline;
Artem Bityutskiyaa3c5dc2012-08-31 16:10:02 +030086static int cmdline_parsed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88/*
89 * Parse one partition definition for an MTD. Since there can be many
Thomas Gleixner97894cd2005-11-07 11:15:26 +000090 * comma separated partition definitions, this function calls itself
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 * recursively until no more partition definitions are found. Nice side
92 * effect: the memory to keep the mtd_partition structs and the names
93 * is allocated upon the last definition being found. At that point the
94 * syntax has been verified ok.
95 */
Thomas Gleixner97894cd2005-11-07 11:15:26 +000096static struct mtd_partition * newpart(char *s,
Artem Bityutskiyfac00772012-09-03 09:33:32 +030097 char **retptr,
98 int *num_parts,
99 int this_part,
100 unsigned char **extra_mem_ptr,
101 int extra_mem_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
103 struct mtd_partition *parts;
Huang Shijie6f9f59e2012-11-01 13:58:17 +0800104 unsigned long long size, offset = OFFSET_CONTINUOUS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 char *name;
106 int name_len;
107 unsigned char *extra_mem;
108 char delim;
109 unsigned int mask_flags;
110
111 /* fetch the partition size */
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300112 if (*s == '-') {
113 /* assign all remaining space to this partition */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 size = SIZE_REMAINING;
115 s++;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300116 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 size = memparse(s, &s);
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300118 if (size < PAGE_SIZE) {
Huang Shijie6f9f59e2012-11-01 13:58:17 +0800119 printk(KERN_ERR ERRP "partition size too small (%llx)\n",
120 size);
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300121 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 }
123 }
124
125 /* fetch partition name and flags */
126 mask_flags = 0; /* this is going to be a regular partition */
127 delim = 0;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300128
129 /* check for offset */
130 if (*s == '@') {
131 s++;
132 offset = memparse(s, &s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000134
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300135 /* now look for name */
136 if (*s == '(')
137 delim = ')';
138
139 if (delim) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 char *p;
141
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300142 name = ++s;
Adrian Bunked262c42008-04-14 17:20:04 +0300143 p = strchr(name, delim);
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300144 if (!p) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim);
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300146 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 }
148 name_len = p - name;
149 s = p + 1;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300150 } else {
151 name = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 name_len = 13; /* Partition_000 */
153 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /* record name length for memory allocation later */
156 extra_mem_size += name_len + 1;
157
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300158 /* test for options */
159 if (strncmp(s, "ro", 2) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 mask_flags |= MTD_WRITEABLE;
161 s += 2;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300164 /* if lk is found do NOT unlock the MTD partition*/
165 if (strncmp(s, "lk", 2) == 0) {
Justin Treone619a752008-01-30 10:25:49 -0800166 mask_flags |= MTD_POWERUP_LOCK;
167 s += 2;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300168 }
Justin Treone619a752008-01-30 10:25:49 -0800169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 /* test if more partitions are following */
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300171 if (*s == ',') {
172 if (size == SIZE_REMAINING) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n");
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300174 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
176 /* more partitions follow, parse them */
Adrian Bunked262c42008-04-14 17:20:04 +0300177 parts = newpart(s + 1, &s, num_parts, this_part + 1,
178 &extra_mem, extra_mem_size);
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300179 if (IS_ERR(parts))
180 return parts;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300181 } else {
182 /* this is the last partition: allocate space for all */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 int alloc_size;
184
185 *num_parts = this_part + 1;
186 alloc_size = *num_parts * sizeof(struct mtd_partition) +
187 extra_mem_size;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300188
Burman Yan95b93a02006-11-15 21:10:29 +0200189 parts = kzalloc(alloc_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (!parts)
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300191 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 extra_mem = (unsigned char *)(parts + *num_parts);
193 }
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 /* enter this partition (offset will be calculated later if it is zero at this point) */
196 parts[this_part].size = size;
197 parts[this_part].offset = offset;
198 parts[this_part].mask_flags = mask_flags;
199 if (name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 strlcpy(extra_mem, name, name_len + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 sprintf(extra_mem, "Partition_%03d", this_part);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 parts[this_part].name = extra_mem;
204 extra_mem += name_len + 1;
205
Thadeu Lima de Souza Cascardo342ba102009-06-24 18:39:09 -0300206 dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n",
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300207 this_part, parts[this_part].name, parts[this_part].offset,
208 parts[this_part].size, parts[this_part].mask_flags));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 /* return (updated) pointer to extra_mem memory */
211 if (extra_mem_ptr)
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300212 *extra_mem_ptr = extra_mem;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214 /* return (updated) pointer command line string */
215 *retptr = s;
216
217 /* return partition table */
218 return parts;
219}
220
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000221/*
222 * Parse the command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 */
224static int mtdpart_setup_real(char *s)
225{
226 cmdline_parsed = 1;
227
228 for( ; s != NULL; )
229 {
230 struct cmdline_mtd_partition *this_mtd;
231 struct mtd_partition *parts;
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300232 int mtd_id_len, num_parts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 char *p, *mtd_id;
234
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300235 mtd_id = s;
236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 /* fetch <mtd-id> */
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300238 p = strchr(s, ':');
239 if (!p) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 printk(KERN_ERR ERRP "no mtd-id\n");
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300241 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243 mtd_id_len = p - mtd_id;
244
245 dbg(("parsing <%s>\n", p+1));
246
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000247 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 * parse one mtd. have it reserve memory for the
249 * struct cmdline_mtd_partition and the mtd-id string.
250 */
251 parts = newpart(p + 1, /* cmdline */
252 &s, /* out: updated cmdline ptr */
253 &num_parts, /* out: number of parts */
254 0, /* first partition */
255 (unsigned char**)&this_mtd, /* out: extra mem */
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000256 mtd_id_len + 1 + sizeof(*this_mtd) +
Joern Engelbe76c5f2005-06-07 16:04:29 +0100257 sizeof(void*)-1 /*alignment*/);
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300258 if (IS_ERR(parts)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 /*
260 * An error occurred. We're either:
261 * a) out of memory, or
262 * b) in the middle of the partition spec
263 * Either way, this mtd is hosed and we're
264 * unlikely to succeed in parsing any more
265 */
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300266 return PTR_ERR(parts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268
Joern Engelbe76c5f2005-06-07 16:04:29 +0100269 /* align this_mtd */
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000270 this_mtd = (struct cmdline_mtd_partition *)
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300271 ALIGN((unsigned long)this_mtd, sizeof(void *));
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000272 /* enter results */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 this_mtd->parts = parts;
274 this_mtd->num_parts = num_parts;
275 this_mtd->mtd_id = (char*)(this_mtd + 1);
276 strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1);
277
278 /* link into chain */
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000279 this_mtd->next = partitions;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 partitions = this_mtd;
281
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000282 dbg(("mtdid=<%s> num_parts=<%d>\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 this_mtd->mtd_id, this_mtd->num_parts));
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 /* EOS - we're done */
287 if (*s == 0)
288 break;
289
290 /* does another spec follow? */
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300291 if (*s != ';') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s);
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300293 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 }
295 s++;
296 }
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300297
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300298 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
301/*
302 * Main function to be called from the MTD mapping driver/device to
303 * obtain the partitioning information. At this point the command line
304 * arguments will actually be parsed and turned to struct mtd_partition
305 * information. It returns partitions for the requested mtd device, or
306 * the first one in the chain if a NULL mtd_id is passed in.
307 */
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000308static int parse_cmdline_partitions(struct mtd_info *master,
Dmitry Eremin-Solenikovc7975332011-06-10 18:18:28 +0400309 struct mtd_partition **pparts,
310 struct mtd_part_parser_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Huang Shijie6f9f59e2012-11-01 13:58:17 +0800312 unsigned long long offset;
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300313 int i, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 struct cmdline_mtd_partition *part;
David Howells36560d22008-07-08 17:09:03 +0100315 const char *mtd_id = master->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 /* parse command line */
Artem Bityutskiy9e0606f2012-09-02 13:54:14 +0300318 if (!cmdline_parsed) {
319 err = mtdpart_setup_real(cmdline);
320 if (err)
321 return err;
322 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Shmulik Ladkani438db5a2012-09-23 09:52:29 +0200324 /*
325 * Search for the partition definition matching master->name.
326 * If master->name is not set, stop at first partition definition.
327 */
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300328 for (part = partitions; part; part = part->next) {
Shmulik Ladkani438db5a2012-09-23 09:52:29 +0200329 if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id)))
330 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 }
Artem Bityutskiyfac00772012-09-03 09:33:32 +0300332
Shmulik Ladkani438db5a2012-09-23 09:52:29 +0200333 if (!part)
334 return 0;
335
336 for (i = 0, offset = 0; i < part->num_parts; i++) {
337 if (part->parts[i].offset == OFFSET_CONTINUOUS)
338 part->parts[i].offset = offset;
339 else
340 offset = part->parts[i].offset;
341
342 if (part->parts[i].size == SIZE_REMAINING)
343 part->parts[i].size = master->size - offset;
344
Christopher Cordahiebf4f072012-12-16 19:59:30 -0500345 if (offset + part->parts[i].size > master->size) {
346 printk(KERN_WARNING ERRP
347 "%s: partitioning exceeds flash size, truncating\n",
348 part->mtd_id);
349 part->parts[i].size = master->size - offset;
350 }
351 offset += part->parts[i].size;
352
Shmulik Ladkani438db5a2012-09-23 09:52:29 +0200353 if (part->parts[i].size == 0) {
354 printk(KERN_WARNING ERRP
355 "%s: skipping zero sized partition\n",
356 part->mtd_id);
357 part->num_parts--;
358 memmove(&part->parts[i], &part->parts[i + 1],
359 sizeof(*part->parts) * (part->num_parts - i));
Christopher Cordahie25e0a42012-12-16 19:59:29 -0500360 i--;
Shmulik Ladkani438db5a2012-09-23 09:52:29 +0200361 }
Shmulik Ladkani438db5a2012-09-23 09:52:29 +0200362 }
363
364 *pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
365 GFP_KERNEL);
366 if (!*pparts)
367 return -ENOMEM;
368
369 return part->num_parts;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
372
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000373/*
374 * This is the handler for our kernel parameter, called from
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 * main.c::checksetup(). Note that we can not yet kmalloc() anything,
376 * so we only save the commandline for later processing.
377 *
378 * This function needs to be visible for bootloaders.
379 */
Lubomir Rintelf5f172d2013-01-16 02:12:49 +0100380static int __init mtdpart_setup(char *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381{
382 cmdline = s;
383 return 1;
384}
385
386__setup("mtdparts=", mtdpart_setup);
387
388static struct mtd_part_parser cmdline_parser = {
389 .owner = THIS_MODULE,
390 .parse_fn = parse_cmdline_partitions,
391 .name = "cmdlinepart",
392};
393
394static int __init cmdline_parser_init(void)
395{
Lubomir Rintelf5f172d2013-01-16 02:12:49 +0100396 if (mtdparts)
397 mtdpart_setup(mtdparts);
Axel Lin6e14a612013-12-01 19:01:06 +0800398 register_mtd_parser(&cmdline_parser);
399 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Lubomir Rintel422f3892013-01-16 02:12:50 +0100402static void __exit cmdline_parser_exit(void)
403{
404 deregister_mtd_parser(&cmdline_parser);
405}
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407module_init(cmdline_parser_init);
Lubomir Rintel422f3892013-01-16 02:12:50 +0100408module_exit(cmdline_parser_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Lubomir Rintelf5f172d2013-01-16 02:12:49 +0100410MODULE_PARM_DESC(mtdparts, "Partitioning specification");
411module_param(mtdparts, charp, 0);
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413MODULE_LICENSE("GPL");
414MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
415MODULE_DESCRIPTION("Command line configuration of MTD partitions");