1 // SPDX-License-Identifier: GPL-2.0+
4 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
9 #include <dm/uclass-internal.h>
10 #include <jffs2/jffs2.h> /* LEGACY */
11 #include <linux/mtd/mtd.h>
12 #include <linux/mtd/partitions.h>
15 #define MTD_NAME_MAX_LEN 20
17 void board_mtdparts_default(const char **mtdids, const char **mtdparts);
19 static const char *get_mtdids(void)
21 __maybe_unused const char *mtdparts = NULL;
22 const char *mtdids = env_get("mtdids");
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;
36 env_set("mtdids", mtdids);
42 * mtd_search_alternate_name - Search an alternate name for @mtdname thanks to
43 * the mtdids legacy environment variable.
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
49 * @mtdname: Current MTD device name
50 * @altname: Alternate name to return
51 * @max_len: Length of the alternate name buffer
53 * @return 0 on success, an error otherwise.
55 int mtd_search_alternate_name(const char *mtdname, char *altname,
58 const char *mtdids, *equal, *comma, *dev_id, *mtd_id;
59 int dev_id_len, mtd_id_len;
61 mtdids = get_mtdids();
66 /* Find the '=' sign */
68 equal = strchr(dev_id, '=');
71 dev_id_len = equal - mtdids;
74 /* Find the end of the tupple */
75 comma = strchr(mtdids, ',');
77 mtd_id_len = comma - mtd_id;
79 mtd_id_len = &mtdids[strlen(mtdids)] - mtd_id + 1;
81 if (!dev_id_len || !mtd_id_len)
84 if (dev_id_len + 1 > max_len)
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;
95 /* Go to the next tupple */
102 #if IS_ENABLED(CONFIG_DM_MTD)
103 static void mtd_probe_uclass_mtd_devs(void)
108 /* Probe devices with DM compliant drivers */
109 while (!uclass_find_device(UCLASS_MTD, idx, &dev) && dev) {
115 static void mtd_probe_uclass_mtd_devs(void) { }
118 #if defined(CONFIG_MTD_PARTITIONS)
120 #define MTDPARTS_MAXLEN 512
122 static const char *get_mtdparts(void)
124 __maybe_unused const char *mtdids = NULL;
125 static char tmp_parts[MTDPARTS_MAXLEN];
126 const char *mtdparts = NULL;
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;
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;
145 env_set("mtdparts", mtdparts);
150 static int mtd_del_parts(struct mtd_info *mtd, bool quiet)
154 if (!mtd_has_partitions(mtd))
157 /* do not delete partitions if they are in use. */
158 if (mtd_partitions_used(mtd)) {
160 printf("\"%s\" partitions still in use, can't delete them\n",
165 ret = del_mtd_partitions(mtd);
172 static bool mtd_del_all_parts_failed;
174 static void mtd_del_all_parts(void)
176 struct mtd_info *mtd;
179 mtd_del_all_parts_failed = false;
182 * It is not safe to remove entries from the mtd_for_each_device loop
183 * as it uses idr indexes and the partitions removal is done in bulk
184 * (all partitions of one device at the same time), so break and
185 * iterate from start each time a new partition is found and deleted.
188 mtd_for_each_device(mtd) {
189 ret = mtd_del_parts(mtd, false);
193 mtd_del_all_parts_failed = true;
198 int mtd_probe_devices(void)
200 static char *old_mtdparts;
201 static char *old_mtdids;
202 const char *mtdparts = get_mtdparts();
203 const char *mtdids = get_mtdids();
204 const char *mtdparts_next = mtdparts;
205 struct mtd_info *mtd;
207 mtd_probe_uclass_mtd_devs();
210 * Check if mtdparts/mtdids changed, if the MTD dev list was updated
211 * or if our previous attempt to delete existing partititions failed.
212 * In any of these cases we want to update the partitions, otherwise,
213 * everything is up-to-date and we can return 0 directly.
215 if ((!mtdparts && !old_mtdparts && !mtdids && !old_mtdids) ||
216 (mtdparts && old_mtdparts && mtdids && old_mtdids &&
217 !mtd_dev_list_updated() && !mtd_del_all_parts_failed &&
218 !strcmp(mtdparts, old_mtdparts) &&
219 !strcmp(mtdids, old_mtdids)))
222 /* Update the local copy of mtdparts */
225 old_mtdparts = strdup(mtdparts);
226 old_mtdids = strdup(mtdids);
229 * Remove all old parts. Note that partition removal can fail in case
230 * one of the partition is still being used by an MTD user, so this
231 * does not guarantee that all old partitions are gone.
236 * Call mtd_dev_list_updated() to clear updates generated by our own
237 * parts removal loop.
239 mtd_dev_list_updated();
241 /* If either mtdparts or mtdids is empty, then exit */
242 if (!mtdparts || !mtdids)
245 /* Start the parsing by ignoring the extra 'mtdparts=' prefix, if any */
246 if (!strncmp(mtdparts, "mtdparts=", sizeof("mtdparts=") - 1))
249 /* For each MTD device in mtdparts */
250 for (; mtdparts[0] != '\0'; mtdparts = mtdparts_next) {
251 char mtd_name[MTD_NAME_MAX_LEN], *colon;
252 struct mtd_partition *parts;
253 unsigned int mtd_name_len;
256 mtdparts_next = strchr(mtdparts, ';');
258 mtdparts_next = mtdparts + strlen(mtdparts);
262 colon = strchr(mtdparts, ':');
263 if (colon > mtdparts_next)
267 printf("Wrong mtdparts: %s\n", mtdparts);
271 mtd_name_len = (unsigned int)(colon - mtdparts);
272 if (mtd_name_len + 1 > sizeof(mtd_name)) {
273 printf("MTD name too long: %s\n", mtdparts);
277 strncpy(mtd_name, mtdparts, mtd_name_len);
278 mtd_name[mtd_name_len] = '\0';
279 /* Move the pointer forward (including the ':') */
280 mtdparts += mtd_name_len + 1;
281 mtd = get_mtd_device_nm(mtd_name);
282 if (IS_ERR_OR_NULL(mtd)) {
283 char linux_name[MTD_NAME_MAX_LEN];
286 * The MTD device named "mtd_name" does not exist. Try
287 * to find a correspondance with an MTD device having
288 * the same type and number as defined in the mtdids.
290 debug("No device named %s\n", mtd_name);
291 ret = mtd_search_alternate_name(mtd_name, linux_name,
294 mtd = get_mtd_device_nm(linux_name);
297 * If no device could be found, move the mtdparts
298 * pointer forward until the next set of partitions.
300 if (ret || IS_ERR_OR_NULL(mtd)) {
301 printf("Could not find a valid device for %s\n",
303 mtdparts = mtdparts_next;
309 * Call mtd_del_parts() again, even if it's already been called
310 * in mtd_del_all_parts(). We need to know if old partitions are
311 * still around (because they are still being used by someone),
312 * and if they are, we shouldn't create new partitions, so just
313 * skip this MTD device and try the next one.
315 ret = mtd_del_parts(mtd, true);
320 * Parse the MTD device partitions. It will update the mtdparts
321 * pointer, create an array of parts (that must be freed), and
322 * return the number of partition structures in the array.
324 ret = mtd_parse_partitions(mtd, &mtdparts, &parts, &nparts);
326 printf("Could not parse device %s\n", mtd->name);
334 /* Create the new MTD partitions */
335 add_mtd_partitions(mtd, parts, nparts);
337 /* Free the structures allocated during the parsing */
338 mtd_free_parsed_partitions(parts, nparts);
344 * Call mtd_dev_list_updated() to clear updates generated by our own
345 * parts registration loop.
347 mtd_dev_list_updated();
352 int mtd_probe_devices(void)
354 mtd_probe_uclass_mtd_devs();
358 #endif /* defined(CONFIG_MTD_PARTITIONS) */
362 static int get_part(const char *partname, int *idx, loff_t *off, loff_t *size,
363 loff_t *maxsize, int devtype)
365 #ifdef CONFIG_CMD_MTDPARTS
366 struct mtd_device *dev;
367 struct part_info *part;
371 ret = mtdparts_init();
375 ret = find_dev_and_part(partname, &dev, &pnum, &part);
379 if (dev->id->type != devtype) {
380 printf("not same typ %d != %d\n", dev->id->type, devtype);
386 *maxsize = part->size;
391 puts("mtdparts support missing.\n");
396 int mtd_arg_off(const char *arg, int *idx, loff_t *off, loff_t *size,
397 loff_t *maxsize, int devtype, uint64_t chipsize)
399 if (!str2off(arg, off))
400 return get_part(arg, idx, off, size, maxsize, devtype);
402 if (*off >= chipsize) {
403 puts("Offset exceeds device limit\n");
407 *maxsize = chipsize - *off;
412 int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
413 loff_t *size, loff_t *maxsize, int devtype,
425 ret = mtd_arg_off(argv[0], idx, off, size, maxsize, devtype,
433 if (!str2off(argv[1], size)) {
434 printf("'%s' is not a number\n", argv[1]);
438 if (*size > *maxsize) {
439 puts("Size exceeds partition or device limit\n");
444 printf("device %d ", *idx);
445 if (*size == chipsize)
446 puts("whole chip\n");
448 printf("offset 0x%llx, size 0x%llx\n",
449 (unsigned long long)*off, (unsigned long long)*size);