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