Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Read flash partition table from command line |
3 | * | |
4 | * Copyright 2002 SYSGO Real-Time Solutions GmbH | |
5 | * | |
6 | * The format for the command line is as follows: | |
97894cda | 7 | * |
1da177e4 LT |
8 | * mtdparts=<mtddef>[;<mtddef] |
9 | * <mtddef> := <mtd-id>:<partdef>[,<partdef>] | |
a0ee24a0 | 10 | * where <mtd-id> is the name from the "cat /proc/mtd" command |
e619a75f | 11 | * <partdef> := <size>[@offset][<name>][ro][lk] |
1da177e4 LT |
12 | * <mtd-id> := unique name used in mapping driver/device (mtd->name) |
13 | * <size> := standard linux memsize OR "-" to denote all remaining space | |
14 | * <name> := '(' NAME ')' | |
97894cda | 15 | * |
1da177e4 | 16 | * Examples: |
97894cda | 17 | * |
1da177e4 LT |
18 | * 1 NOR Flash, with 1 single writable partition: |
19 | * edb7312-nor:- | |
97894cda | 20 | * |
1da177e4 LT |
21 | * 1 NOR Flash with 2 partitions, 1 NAND with one |
22 | * edb7312-nor:256k(ARMboot)ro,-(root);edb7312-nand:-(home) | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | ||
28 | #include <linux/mtd/mtd.h> | |
29 | #include <linux/mtd/partitions.h> | |
30 | #include <linux/bootmem.h> | |
31 | ||
32 | /* error message prefix */ | |
33 | #define ERRP "mtd: " | |
34 | ||
35 | /* debug macro */ | |
36 | #if 0 | |
37 | #define dbg(x) do { printk("DEBUG-CMDLINE-PART: "); printk x; } while(0) | |
38 | #else | |
39 | #define dbg(x) | |
40 | #endif | |
41 | ||
42 | ||
43 | /* special size referring to all the remaining space in a partition */ | |
b175d03d AN |
44 | #define SIZE_REMAINING UINT_MAX |
45 | #define OFFSET_CONTINUOUS UINT_MAX | |
1da177e4 LT |
46 | |
47 | struct cmdline_mtd_partition { | |
48 | struct cmdline_mtd_partition *next; | |
49 | char *mtd_id; | |
50 | int num_parts; | |
51 | struct mtd_partition *parts; | |
52 | }; | |
53 | ||
54 | /* mtdpart_setup() parses into here */ | |
55 | static struct cmdline_mtd_partition *partitions; | |
56 | ||
57 | /* the command line passed to mtdpart_setupd() */ | |
58 | static char *cmdline; | |
59 | static int cmdline_parsed = 0; | |
60 | ||
61 | /* | |
62 | * Parse one partition definition for an MTD. Since there can be many | |
97894cda | 63 | * comma separated partition definitions, this function calls itself |
1da177e4 LT |
64 | * recursively until no more partition definitions are found. Nice side |
65 | * effect: the memory to keep the mtd_partition structs and the names | |
66 | * is allocated upon the last definition being found. At that point the | |
67 | * syntax has been verified ok. | |
68 | */ | |
97894cda | 69 | static struct mtd_partition * newpart(char *s, |
1da177e4 LT |
70 | char **retptr, |
71 | int *num_parts, | |
97894cda TG |
72 | int this_part, |
73 | unsigned char **extra_mem_ptr, | |
1da177e4 LT |
74 | int extra_mem_size) |
75 | { | |
76 | struct mtd_partition *parts; | |
77 | unsigned long size; | |
b175d03d | 78 | unsigned long offset = OFFSET_CONTINUOUS; |
1da177e4 LT |
79 | char *name; |
80 | int name_len; | |
81 | unsigned char *extra_mem; | |
82 | char delim; | |
83 | unsigned int mask_flags; | |
84 | ||
85 | /* fetch the partition size */ | |
86 | if (*s == '-') | |
87 | { /* assign all remaining space to this partition */ | |
88 | size = SIZE_REMAINING; | |
89 | s++; | |
90 | } | |
91 | else | |
92 | { | |
93 | size = memparse(s, &s); | |
94 | if (size < PAGE_SIZE) | |
95 | { | |
96 | printk(KERN_ERR ERRP "partition size too small (%lx)\n", size); | |
97 | return NULL; | |
98 | } | |
99 | } | |
100 | ||
101 | /* fetch partition name and flags */ | |
102 | mask_flags = 0; /* this is going to be a regular partition */ | |
103 | delim = 0; | |
104 | /* check for offset */ | |
97894cda | 105 | if (*s == '@') |
1da177e4 LT |
106 | { |
107 | s++; | |
108 | offset = memparse(s, &s); | |
109 | } | |
110 | /* now look for name */ | |
111 | if (*s == '(') | |
112 | { | |
113 | delim = ')'; | |
114 | } | |
97894cda | 115 | |
1da177e4 LT |
116 | if (delim) |
117 | { | |
118 | char *p; | |
119 | ||
120 | name = ++s; | |
ed262c4f AB |
121 | p = strchr(name, delim); |
122 | if (!p) | |
1da177e4 LT |
123 | { |
124 | printk(KERN_ERR ERRP "no closing %c found in partition name\n", delim); | |
125 | return NULL; | |
126 | } | |
127 | name_len = p - name; | |
128 | s = p + 1; | |
129 | } | |
130 | else | |
131 | { | |
132 | name = NULL; | |
133 | name_len = 13; /* Partition_000 */ | |
134 | } | |
97894cda | 135 | |
1da177e4 LT |
136 | /* record name length for memory allocation later */ |
137 | extra_mem_size += name_len + 1; | |
138 | ||
139 | /* test for options */ | |
97894cda | 140 | if (strncmp(s, "ro", 2) == 0) |
1da177e4 LT |
141 | { |
142 | mask_flags |= MTD_WRITEABLE; | |
143 | s += 2; | |
144 | } | |
145 | ||
e619a75f JT |
146 | /* if lk is found do NOT unlock the MTD partition*/ |
147 | if (strncmp(s, "lk", 2) == 0) | |
148 | { | |
149 | mask_flags |= MTD_POWERUP_LOCK; | |
150 | s += 2; | |
151 | } | |
152 | ||
1da177e4 LT |
153 | /* test if more partitions are following */ |
154 | if (*s == ',') | |
155 | { | |
156 | if (size == SIZE_REMAINING) | |
157 | { | |
158 | printk(KERN_ERR ERRP "no partitions allowed after a fill-up partition\n"); | |
159 | return NULL; | |
160 | } | |
161 | /* more partitions follow, parse them */ | |
ed262c4f AB |
162 | parts = newpart(s + 1, &s, num_parts, this_part + 1, |
163 | &extra_mem, extra_mem_size); | |
164 | if (!parts) | |
165 | return NULL; | |
1da177e4 LT |
166 | } |
167 | else | |
168 | { /* this is the last partition: allocate space for all */ | |
169 | int alloc_size; | |
170 | ||
171 | *num_parts = this_part + 1; | |
172 | alloc_size = *num_parts * sizeof(struct mtd_partition) + | |
173 | extra_mem_size; | |
95b93a0c | 174 | parts = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 LT |
175 | if (!parts) |
176 | { | |
177 | printk(KERN_ERR ERRP "out of memory\n"); | |
178 | return NULL; | |
179 | } | |
1da177e4 LT |
180 | extra_mem = (unsigned char *)(parts + *num_parts); |
181 | } | |
182 | /* enter this partition (offset will be calculated later if it is zero at this point) */ | |
183 | parts[this_part].size = size; | |
184 | parts[this_part].offset = offset; | |
185 | parts[this_part].mask_flags = mask_flags; | |
186 | if (name) | |
187 | { | |
188 | strlcpy(extra_mem, name, name_len + 1); | |
189 | } | |
190 | else | |
191 | { | |
192 | sprintf(extra_mem, "Partition_%03d", this_part); | |
193 | } | |
194 | parts[this_part].name = extra_mem; | |
195 | extra_mem += name_len + 1; | |
196 | ||
342ba103 | 197 | dbg(("partition %d: name <%s>, offset %llx, size %llx, mask flags %x\n", |
97894cda | 198 | this_part, |
1da177e4 LT |
199 | parts[this_part].name, |
200 | parts[this_part].offset, | |
201 | parts[this_part].size, | |
202 | parts[this_part].mask_flags)); | |
203 | ||
204 | /* return (updated) pointer to extra_mem memory */ | |
205 | if (extra_mem_ptr) | |
206 | *extra_mem_ptr = extra_mem; | |
207 | ||
208 | /* return (updated) pointer command line string */ | |
209 | *retptr = s; | |
210 | ||
211 | /* return partition table */ | |
212 | return parts; | |
213 | } | |
214 | ||
97894cda TG |
215 | /* |
216 | * Parse the command line. | |
1da177e4 LT |
217 | */ |
218 | static int mtdpart_setup_real(char *s) | |
219 | { | |
220 | cmdline_parsed = 1; | |
221 | ||
222 | for( ; s != NULL; ) | |
223 | { | |
224 | struct cmdline_mtd_partition *this_mtd; | |
225 | struct mtd_partition *parts; | |
226 | int mtd_id_len; | |
227 | int num_parts; | |
228 | char *p, *mtd_id; | |
229 | ||
230 | mtd_id = s; | |
231 | /* fetch <mtd-id> */ | |
232 | if (!(p = strchr(s, ':'))) | |
233 | { | |
234 | printk(KERN_ERR ERRP "no mtd-id\n"); | |
235 | return 0; | |
236 | } | |
237 | mtd_id_len = p - mtd_id; | |
238 | ||
239 | dbg(("parsing <%s>\n", p+1)); | |
240 | ||
97894cda | 241 | /* |
1da177e4 LT |
242 | * parse one mtd. have it reserve memory for the |
243 | * struct cmdline_mtd_partition and the mtd-id string. | |
244 | */ | |
245 | parts = newpart(p + 1, /* cmdline */ | |
246 | &s, /* out: updated cmdline ptr */ | |
247 | &num_parts, /* out: number of parts */ | |
248 | 0, /* first partition */ | |
249 | (unsigned char**)&this_mtd, /* out: extra mem */ | |
97894cda | 250 | mtd_id_len + 1 + sizeof(*this_mtd) + |
be76c5fb | 251 | sizeof(void*)-1 /*alignment*/); |
1da177e4 LT |
252 | if(!parts) |
253 | { | |
254 | /* | |
255 | * An error occurred. We're either: | |
256 | * a) out of memory, or | |
257 | * b) in the middle of the partition spec | |
258 | * Either way, this mtd is hosed and we're | |
259 | * unlikely to succeed in parsing any more | |
260 | */ | |
261 | return 0; | |
262 | } | |
263 | ||
be76c5fb | 264 | /* align this_mtd */ |
97894cda | 265 | this_mtd = (struct cmdline_mtd_partition *) |
be76c5fb | 266 | ALIGN((unsigned long)this_mtd, sizeof(void*)); |
97894cda | 267 | /* enter results */ |
1da177e4 LT |
268 | this_mtd->parts = parts; |
269 | this_mtd->num_parts = num_parts; | |
270 | this_mtd->mtd_id = (char*)(this_mtd + 1); | |
271 | strlcpy(this_mtd->mtd_id, mtd_id, mtd_id_len + 1); | |
272 | ||
273 | /* link into chain */ | |
97894cda | 274 | this_mtd->next = partitions; |
1da177e4 LT |
275 | partitions = this_mtd; |
276 | ||
97894cda | 277 | dbg(("mtdid=<%s> num_parts=<%d>\n", |
1da177e4 | 278 | this_mtd->mtd_id, this_mtd->num_parts)); |
97894cda | 279 | |
1da177e4 LT |
280 | |
281 | /* EOS - we're done */ | |
282 | if (*s == 0) | |
283 | break; | |
284 | ||
285 | /* does another spec follow? */ | |
286 | if (*s != ';') | |
287 | { | |
288 | printk(KERN_ERR ERRP "bad character after partition (%c)\n", *s); | |
289 | return 0; | |
290 | } | |
291 | s++; | |
292 | } | |
293 | return 1; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Main function to be called from the MTD mapping driver/device to | |
298 | * obtain the partitioning information. At this point the command line | |
299 | * arguments will actually be parsed and turned to struct mtd_partition | |
300 | * information. It returns partitions for the requested mtd device, or | |
301 | * the first one in the chain if a NULL mtd_id is passed in. | |
302 | */ | |
97894cda | 303 | static int parse_cmdline_partitions(struct mtd_info *master, |
1da177e4 LT |
304 | struct mtd_partition **pparts, |
305 | unsigned long origin) | |
306 | { | |
307 | unsigned long offset; | |
308 | int i; | |
309 | struct cmdline_mtd_partition *part; | |
36560d25 | 310 | const char *mtd_id = master->name; |
1da177e4 | 311 | |
1da177e4 LT |
312 | /* parse command line */ |
313 | if (!cmdline_parsed) | |
314 | mtdpart_setup_real(cmdline); | |
315 | ||
316 | for(part = partitions; part; part = part->next) | |
317 | { | |
318 | if ((!mtd_id) || (!strcmp(part->mtd_id, mtd_id))) | |
319 | { | |
320 | for(i = 0, offset = 0; i < part->num_parts; i++) | |
321 | { | |
b175d03d | 322 | if (part->parts[i].offset == OFFSET_CONTINUOUS) |
1da177e4 LT |
323 | part->parts[i].offset = offset; |
324 | else | |
325 | offset = part->parts[i].offset; | |
326 | if (part->parts[i].size == SIZE_REMAINING) | |
327 | part->parts[i].size = master->size - offset; | |
328 | if (offset + part->parts[i].size > master->size) | |
329 | { | |
97894cda | 330 | printk(KERN_WARNING ERRP |
1da177e4 LT |
331 | "%s: partitioning exceeds flash size, truncating\n", |
332 | part->mtd_id); | |
333 | part->parts[i].size = master->size - offset; | |
334 | part->num_parts = i; | |
335 | } | |
336 | offset += part->parts[i].size; | |
337 | } | |
17b536cc AN |
338 | *pparts = kmemdup(part->parts, |
339 | sizeof(*part->parts) * part->num_parts, | |
340 | GFP_KERNEL); | |
341 | if (!*pparts) | |
342 | return -ENOMEM; | |
1da177e4 LT |
343 | return part->num_parts; |
344 | } | |
345 | } | |
b0d06afb | 346 | return 0; |
1da177e4 LT |
347 | } |
348 | ||
349 | ||
97894cda TG |
350 | /* |
351 | * This is the handler for our kernel parameter, called from | |
1da177e4 LT |
352 | * main.c::checksetup(). Note that we can not yet kmalloc() anything, |
353 | * so we only save the commandline for later processing. | |
354 | * | |
355 | * This function needs to be visible for bootloaders. | |
356 | */ | |
ddacff1f | 357 | static int mtdpart_setup(char *s) |
1da177e4 LT |
358 | { |
359 | cmdline = s; | |
360 | return 1; | |
361 | } | |
362 | ||
363 | __setup("mtdparts=", mtdpart_setup); | |
364 | ||
365 | static struct mtd_part_parser cmdline_parser = { | |
366 | .owner = THIS_MODULE, | |
367 | .parse_fn = parse_cmdline_partitions, | |
368 | .name = "cmdlinepart", | |
369 | }; | |
370 | ||
371 | static int __init cmdline_parser_init(void) | |
372 | { | |
373 | return register_mtd_parser(&cmdline_parser); | |
374 | } | |
375 | ||
376 | module_init(cmdline_parser_init); | |
377 | ||
378 | MODULE_LICENSE("GPL"); | |
379 | MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>"); | |
380 | MODULE_DESCRIPTION("Command line configuration of MTD partitions"); |