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