1 /* 2 * (C) Copyright 2014 3 * Heiko Schocher, DENX Software Engineering, hs@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 #include <common.h> 8 #include <dm/device.h> 9 #include <dm/uclass-internal.h> 10 #include <jffs2/jffs2.h> /* LEGACY */ 11 #include <linux/mtd/mtd.h> 12 #include <linux/mtd/partitions.h> 13 #include <mtd.h> 14 15 #define MTD_NAME_MAX_LEN 20 16 17 void board_mtdparts_default(const char **mtdids, const char **mtdparts); 18 19 static const char *get_mtdids(void) 20 { 21 __maybe_unused const char *mtdparts = NULL; 22 const char *mtdids = env_get("mtdids"); 23 24 if (mtdids) 25 return mtdids; 26 27 #if defined(CONFIG_SYS_MTDPARTS_RUNTIME) 28 board_mtdparts_default(&mtdids, &mtdparts); 29 #elif defined(MTDIDS_DEFAULT) 30 mtdids = MTDIDS_DEFAULT; 31 #elif defined(CONFIG_MTDIDS_DEFAULT) 32 mtdids = CONFIG_MTDIDS_DEFAULT; 33 #endif 34 35 if (mtdids) 36 env_set("mtdids", mtdids); 37 38 return mtdids; 39 } 40 41 /** 42 * mtd_search_alternate_name - Search an alternate name for @mtdname thanks to 43 * the mtdids legacy environment variable. 44 * 45 * The mtdids string is a list of comma-separated 'dev_id=mtd_id' tupples. 46 * Check if one of the mtd_id matches mtdname, in this case save dev_id in 47 * altname. 48 * 49 * @mtdname: Current MTD device name 50 * @altname: Alternate name to return 51 * @max_len: Length of the alternate name buffer 52 * 53 * @return 0 on success, an error otherwise. 54 */ 55 int mtd_search_alternate_name(const char *mtdname, char *altname, 56 unsigned int max_len) 57 { 58 const char *mtdids, *equal, *comma, *dev_id, *mtd_id; 59 int dev_id_len, mtd_id_len; 60 61 mtdids = get_mtdids(); 62 if (!mtdids) 63 return -EINVAL; 64 65 do { 66 /* Find the '=' sign */ 67 dev_id = mtdids; 68 equal = strchr(dev_id, '='); 69 if (!equal) 70 break; 71 dev_id_len = equal - mtdids; 72 mtd_id = equal + 1; 73 74 /* Find the end of the tupple */ 75 comma = strchr(mtdids, ','); 76 if (comma) 77 mtd_id_len = comma - mtd_id; 78 else 79 mtd_id_len = &mtdids[strlen(mtdids)] - mtd_id + 1; 80 81 if (!dev_id_len || !mtd_id_len) 82 return -EINVAL; 83 84 if (dev_id_len + 1 > max_len) 85 continue; 86 87 /* Compare the name we search with the current mtd_id */ 88 if (!strncmp(mtdname, mtd_id, mtd_id_len)) { 89 strncpy(altname, dev_id, dev_id_len); 90 altname[dev_id_len] = 0; 91 92 return 0; 93 } 94 95 /* Go to the next tupple */ 96 mtdids = comma + 1; 97 } while (comma); 98 99 return -EINVAL; 100 } 101 102 #if IS_ENABLED(CONFIG_MTD) 103 static void mtd_probe_uclass_mtd_devs(void) 104 { 105 struct udevice *dev; 106 int idx = 0; 107 108 /* Probe devices with DM compliant drivers */ 109 while (!uclass_find_device(UCLASS_MTD, idx, &dev) && dev) { 110 mtd_probe(dev); 111 idx++; 112 } 113 } 114 #else 115 static void mtd_probe_uclass_mtd_devs(void) { } 116 #endif 117 118 #if defined(CONFIG_MTD_PARTITIONS) 119 120 #define MTDPARTS_MAXLEN 512 121 122 static const char *get_mtdparts(void) 123 { 124 __maybe_unused const char *mtdids = NULL; 125 static char tmp_parts[MTDPARTS_MAXLEN]; 126 static bool use_defaults = true; 127 const char *mtdparts = NULL; 128 129 if (gd->flags & GD_FLG_ENV_READY) 130 mtdparts = env_get("mtdparts"); 131 else if (env_get_f("mtdparts", tmp_parts, sizeof(tmp_parts)) != -1) 132 mtdparts = tmp_parts; 133 134 if (mtdparts || !use_defaults) 135 return mtdparts; 136 137 #if defined(CONFIG_SYS_MTDPARTS_RUNTIME) 138 board_mtdparts_default(&mtdids, &mtdparts); 139 #elif defined(MTDPARTS_DEFAULT) 140 mtdparts = MTDPARTS_DEFAULT; 141 #elif defined(CONFIG_MTDPARTS_DEFAULT) 142 mtdparts = CONFIG_MTDPARTS_DEFAULT; 143 #endif 144 145 if (mtdparts) 146 env_set("mtdparts", mtdparts); 147 148 use_defaults = false; 149 150 return mtdparts; 151 } 152 153 int mtd_probe_devices(void) 154 { 155 static char *old_mtdparts; 156 static char *old_mtdids; 157 const char *mtdparts = get_mtdparts(); 158 const char *mtdids = get_mtdids(); 159 const char *mtdparts_next = mtdparts; 160 bool remaining_partitions = true; 161 struct mtd_info *mtd; 162 163 mtd_probe_uclass_mtd_devs(); 164 165 /* 166 * Check if mtdparts/mtdids changed or if the MTD dev list was updated 167 * since last call, otherwise: exit 168 */ 169 if ((!mtdparts && !old_mtdparts && !mtdids && !old_mtdids) || 170 (mtdparts && old_mtdparts && mtdids && old_mtdids && 171 !mtd_dev_list_updated() && 172 !strcmp(mtdparts, old_mtdparts) && 173 !strcmp(mtdids, old_mtdids))) 174 return 0; 175 176 /* Update the local copy of mtdparts */ 177 free(old_mtdparts); 178 free(old_mtdids); 179 old_mtdparts = strdup(mtdparts); 180 old_mtdids = strdup(mtdids); 181 182 /* If at least one partition is still in use, do not delete anything */ 183 mtd_for_each_device(mtd) { 184 if (mtd->usecount) { 185 printf("Partition \"%s\" already in use, aborting\n", 186 mtd->name); 187 return -EACCES; 188 } 189 } 190 191 /* 192 * Everything looks clear, remove all partitions. It is not safe to 193 * remove entries from the mtd_for_each_device loop as it uses idr 194 * indexes and the partitions removal is done in bulk (all partitions of 195 * one device at the same time), so break and iterate from start each 196 * time a new partition is found and deleted. 197 */ 198 while (remaining_partitions) { 199 remaining_partitions = false; 200 mtd_for_each_device(mtd) { 201 if (!mtd_is_partition(mtd) && mtd_has_partitions(mtd)) { 202 del_mtd_partitions(mtd); 203 remaining_partitions = true; 204 break; 205 } 206 } 207 } 208 209 /* 210 * Call mtd_dev_list_updated() to clear updates generated by our own 211 * parts removal loop. 212 */ 213 mtd_dev_list_updated(); 214 215 /* If either mtdparts or mtdids is empty, then exit */ 216 if (!mtdparts || !mtdids) 217 return 0; 218 219 /* Start the parsing by ignoring the extra 'mtdparts=' prefix, if any */ 220 if (!strncmp(mtdparts, "mtdparts=", sizeof("mtdparts=") - 1)) 221 mtdparts += 9; 222 223 /* For each MTD device in mtdparts */ 224 for (; mtdparts[0] != '\0'; mtdparts = mtdparts_next) { 225 char mtd_name[MTD_NAME_MAX_LEN], *colon; 226 struct mtd_partition *parts; 227 unsigned int mtd_name_len; 228 int nparts, ret; 229 230 mtdparts_next = strchr(mtdparts, ';'); 231 if (!mtdparts_next) 232 mtdparts_next = mtdparts + strlen(mtdparts); 233 else 234 mtdparts_next++; 235 236 colon = strchr(mtdparts, ':'); 237 if (colon > mtdparts_next) 238 colon = NULL; 239 240 if (!colon) { 241 printf("Wrong mtdparts: %s\n", mtdparts); 242 return -EINVAL; 243 } 244 245 mtd_name_len = (unsigned int)(colon - mtdparts); 246 if (mtd_name_len + 1 > sizeof(mtd_name)) { 247 printf("MTD name too long: %s\n", mtdparts); 248 return -EINVAL; 249 } 250 251 strncpy(mtd_name, mtdparts, mtd_name_len); 252 mtd_name[mtd_name_len] = '\0'; 253 /* Move the pointer forward (including the ':') */ 254 mtdparts += mtd_name_len + 1; 255 mtd = get_mtd_device_nm(mtd_name); 256 if (IS_ERR_OR_NULL(mtd)) { 257 char linux_name[MTD_NAME_MAX_LEN]; 258 259 /* 260 * The MTD device named "mtd_name" does not exist. Try 261 * to find a correspondance with an MTD device having 262 * the same type and number as defined in the mtdids. 263 */ 264 debug("No device named %s\n", mtd_name); 265 ret = mtd_search_alternate_name(mtd_name, linux_name, 266 MTD_NAME_MAX_LEN); 267 if (!ret) 268 mtd = get_mtd_device_nm(linux_name); 269 270 /* 271 * If no device could be found, move the mtdparts 272 * pointer forward until the next set of partitions. 273 */ 274 if (ret || IS_ERR_OR_NULL(mtd)) { 275 printf("Could not find a valid device for %s\n", 276 mtd_name); 277 mtdparts = mtdparts_next; 278 continue; 279 } 280 } 281 282 /* 283 * Parse the MTD device partitions. It will update the mtdparts 284 * pointer, create an array of parts (that must be freed), and 285 * return the number of partition structures in the array. 286 */ 287 ret = mtd_parse_partitions(mtd, &mtdparts, &parts, &nparts); 288 if (ret) { 289 printf("Could not parse device %s\n", mtd->name); 290 put_mtd_device(mtd); 291 return -EINVAL; 292 } 293 294 if (!nparts) 295 continue; 296 297 /* Create the new MTD partitions */ 298 add_mtd_partitions(mtd, parts, nparts); 299 300 /* Free the structures allocated during the parsing */ 301 mtd_free_parsed_partitions(parts, nparts); 302 303 put_mtd_device(mtd); 304 } 305 306 /* 307 * Call mtd_dev_list_updated() to clear updates generated by our own 308 * parts registration loop. 309 */ 310 mtd_dev_list_updated(); 311 312 return 0; 313 } 314 #else 315 int mtd_probe_devices(void) 316 { 317 mtd_probe_uclass_mtd_devs(); 318 319 return 0; 320 } 321 #endif /* defined(CONFIG_MTD_PARTITIONS) */ 322 323 /* Legacy */ 324 325 static int get_part(const char *partname, int *idx, loff_t *off, loff_t *size, 326 loff_t *maxsize, int devtype) 327 { 328 #ifdef CONFIG_CMD_MTDPARTS 329 struct mtd_device *dev; 330 struct part_info *part; 331 u8 pnum; 332 int ret; 333 334 ret = mtdparts_init(); 335 if (ret) 336 return ret; 337 338 ret = find_dev_and_part(partname, &dev, &pnum, &part); 339 if (ret) 340 return ret; 341 342 if (dev->id->type != devtype) { 343 printf("not same typ %d != %d\n", dev->id->type, devtype); 344 return -1; 345 } 346 347 *off = part->offset; 348 *size = part->size; 349 *maxsize = part->size; 350 *idx = dev->id->num; 351 352 return 0; 353 #else 354 puts("mtdparts support missing.\n"); 355 return -1; 356 #endif 357 } 358 359 int mtd_arg_off(const char *arg, int *idx, loff_t *off, loff_t *size, 360 loff_t *maxsize, int devtype, uint64_t chipsize) 361 { 362 if (!str2off(arg, off)) 363 return get_part(arg, idx, off, size, maxsize, devtype); 364 365 if (*off >= chipsize) { 366 puts("Offset exceeds device limit\n"); 367 return -1; 368 } 369 370 *maxsize = chipsize - *off; 371 *size = *maxsize; 372 return 0; 373 } 374 375 int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off, 376 loff_t *size, loff_t *maxsize, int devtype, 377 uint64_t chipsize) 378 { 379 int ret; 380 381 if (argc == 0) { 382 *off = 0; 383 *size = chipsize; 384 *maxsize = *size; 385 goto print; 386 } 387 388 ret = mtd_arg_off(argv[0], idx, off, size, maxsize, devtype, 389 chipsize); 390 if (ret) 391 return ret; 392 393 if (argc == 1) 394 goto print; 395 396 if (!str2off(argv[1], size)) { 397 printf("'%s' is not a number\n", argv[1]); 398 return -1; 399 } 400 401 if (*size > *maxsize) { 402 puts("Size exceeds partition or device limit\n"); 403 return -1; 404 } 405 406 print: 407 printf("device %d ", *idx); 408 if (*size == chipsize) 409 puts("whole chip\n"); 410 else 411 printf("offset 0x%llx, size 0x%llx\n", 412 (unsigned long long)*off, (unsigned long long)*size); 413 return 0; 414 } 415