1 // SPDX-License-Identifier: GPL-2.0+
4 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
10 #include <dm/device.h>
11 #include <dm/uclass-internal.h>
12 #include <linux/err.h>
13 #include <linux/mtd/mtd.h>
14 #include <linux/mtd/partitions.h>
15 #include <asm/global_data.h>
18 #define MTD_NAME_MAX_LEN 20
20 void board_mtdparts_default(const char **mtdids, const char **mtdparts);
22 static const char *get_mtdids(void)
24 __maybe_unused const char *mtdparts = NULL;
25 const char *mtdids = env_get("mtdids");
30 #if defined(CONFIG_SYS_MTDPARTS_RUNTIME)
31 board_mtdparts_default(&mtdids, &mtdparts);
32 #elif defined(MTDIDS_DEFAULT)
33 mtdids = MTDIDS_DEFAULT;
34 #elif defined(CONFIG_MTDIDS_DEFAULT)
35 mtdids = CONFIG_MTDIDS_DEFAULT;
39 env_set("mtdids", mtdids);
45 * mtd_search_alternate_name - Search an alternate name for @mtdname thanks to
46 * the mtdids legacy environment variable.
48 * The mtdids string is a list of comma-separated 'dev_id=mtd_id' tupples.
49 * Check if one of the mtd_id matches mtdname, in this case save dev_id in
52 * @mtdname: Current MTD device name
53 * @altname: Alternate name to return
54 * @max_len: Length of the alternate name buffer
56 * @return 0 on success, an error otherwise.
58 int mtd_search_alternate_name(const char *mtdname, char *altname,
61 const char *mtdids, *equal, *comma, *dev_id, *mtd_id;
62 int dev_id_len, mtd_id_len;
64 mtdids = get_mtdids();
69 /* Find the '=' sign */
71 equal = strchr(dev_id, '=');
74 dev_id_len = equal - mtdids;
77 /* Find the end of the tupple */
78 comma = strchr(mtdids, ',');
80 mtd_id_len = comma - mtd_id;
82 mtd_id_len = &mtdids[strlen(mtdids)] - mtd_id + 1;
84 if (!dev_id_len || !mtd_id_len)
87 if (dev_id_len + 1 > max_len)
90 /* Compare the name we search with the current mtd_id */
91 if (!strncmp(mtdname, mtd_id, mtd_id_len)) {
92 strncpy(altname, dev_id, dev_id_len);
93 altname[dev_id_len] = 0;
98 /* Go to the next tupple */
105 #if IS_ENABLED(CONFIG_DM_MTD)
106 static void mtd_probe_uclass_mtd_devs(void)
111 /* Probe devices with DM compliant drivers */
112 while (!uclass_find_device(UCLASS_MTD, idx, &dev) && dev) {
118 static void mtd_probe_uclass_mtd_devs(void) { }
121 #if defined(CONFIG_MTD_PARTITIONS)
123 #define MTDPARTS_MAXLEN 512
125 static const char *get_mtdparts(void)
127 __maybe_unused const char *mtdids = NULL;
128 static char tmp_parts[MTDPARTS_MAXLEN];
129 const char *mtdparts = NULL;
131 if (gd->flags & GD_FLG_ENV_READY)
132 mtdparts = env_get("mtdparts");
133 else if (env_get_f("mtdparts", tmp_parts, sizeof(tmp_parts)) != -1)
134 mtdparts = tmp_parts;
139 #if defined(CONFIG_SYS_MTDPARTS_RUNTIME)
140 board_mtdparts_default(&mtdids, &mtdparts);
141 #elif defined(MTDPARTS_DEFAULT)
142 mtdparts = MTDPARTS_DEFAULT;
143 #elif defined(CONFIG_MTDPARTS_DEFAULT)
144 mtdparts = CONFIG_MTDPARTS_DEFAULT;
148 env_set("mtdparts", mtdparts);
153 static int mtd_del_parts(struct mtd_info *mtd, bool quiet)
157 if (!mtd_has_partitions(mtd))
160 /* do not delete partitions if they are in use. */
161 if (mtd_partitions_used(mtd)) {
163 printf("\"%s\" partitions still in use, can't delete them\n",
168 ret = del_mtd_partitions(mtd);
175 static bool mtd_del_all_parts_failed;
177 static void mtd_del_all_parts(void)
179 struct mtd_info *mtd;
182 mtd_del_all_parts_failed = false;
185 * It is not safe to remove entries from the mtd_for_each_device loop
186 * as it uses idr indexes and the partitions removal is done in bulk
187 * (all partitions of one device at the same time), so break and
188 * iterate from start each time a new partition is found and deleted.
191 mtd_for_each_device(mtd) {
192 ret = mtd_del_parts(mtd, false);
196 mtd_del_all_parts_failed = true;
201 static int parse_mtdparts(const char *mtdparts, const char *mtdids)
203 const char *mtdparts_next;
204 struct mtd_info *mtd;
206 /* Start the parsing by ignoring the extra 'mtdparts=' prefix, if any */
207 if (!strncmp(mtdparts, "mtdparts=", sizeof("mtdparts=") - 1))
210 /* For each MTD device in mtdparts */
211 for (; mtdparts[0] != '\0'; mtdparts = mtdparts_next) {
212 char mtd_name[MTD_NAME_MAX_LEN], *colon;
213 struct mtd_partition *parts;
214 unsigned int mtd_name_len;
217 mtdparts_next = strchr(mtdparts, ';');
219 mtdparts_next = mtdparts + strlen(mtdparts);
223 colon = strchr(mtdparts, ':');
224 if (colon > mtdparts_next)
228 printf("Wrong mtdparts: %s\n", mtdparts);
232 mtd_name_len = (unsigned int)(colon - mtdparts);
233 if (mtd_name_len + 1 > sizeof(mtd_name)) {
234 printf("MTD name too long: %s\n", mtdparts);
238 strncpy(mtd_name, mtdparts, mtd_name_len);
239 mtd_name[mtd_name_len] = '\0';
240 /* Move the pointer forward (including the ':') */
241 mtdparts += mtd_name_len + 1;
242 mtd = get_mtd_device_nm(mtd_name);
243 if (IS_ERR_OR_NULL(mtd)) {
244 char linux_name[MTD_NAME_MAX_LEN];
247 * The MTD device named "mtd_name" does not exist. Try
248 * to find a correspondance with an MTD device having
249 * the same type and number as defined in the mtdids.
251 debug("No device named %s\n", mtd_name);
252 ret = mtd_search_alternate_name(mtd_name, linux_name,
255 mtd = get_mtd_device_nm(linux_name);
258 * If no device could be found, move the mtdparts
259 * pointer forward until the next set of partitions.
261 if (ret || IS_ERR_OR_NULL(mtd)) {
262 printf("Could not find a valid device for %s\n",
264 mtdparts = mtdparts_next;
270 * Call mtd_del_parts() again, even if it's already been called
271 * in mtd_del_all_parts(). We need to know if old partitions are
272 * still around (because they are still being used by someone),
273 * and if they are, we shouldn't create new partitions, so just
274 * skip this MTD device and try the next one.
276 ret = mtd_del_parts(mtd, true);
281 * Parse the MTD device partitions. It will update the mtdparts
282 * pointer, create an array of parts (that must be freed), and
283 * return the number of partition structures in the array.
285 ret = mtd_parse_partitions(mtd, &mtdparts, &parts, &nparts);
287 printf("Could not parse device %s\n", mtd->name);
295 /* Create the new MTD partitions */
296 add_mtd_partitions(mtd, parts, nparts);
298 /* Free the structures allocated during the parsing */
299 mtd_free_parsed_partitions(parts, nparts);
307 int mtd_probe_devices(void)
309 static char *old_mtdparts;
310 static char *old_mtdids;
311 const char *mtdparts = get_mtdparts();
312 const char *mtdids = get_mtdids();
313 struct mtd_info *mtd;
315 mtd_probe_uclass_mtd_devs();
318 * Check if mtdparts/mtdids changed, if the MTD dev list was updated
319 * or if our previous attempt to delete existing partititions failed.
320 * In any of these cases we want to update the partitions, otherwise,
321 * everything is up-to-date and we can return 0 directly.
323 if ((!mtdparts && !old_mtdparts && !mtdids && !old_mtdids) ||
324 (mtdparts && old_mtdparts && mtdids && old_mtdids &&
325 !mtd_dev_list_updated() && !mtd_del_all_parts_failed &&
326 !strcmp(mtdparts, old_mtdparts) &&
327 !strcmp(mtdids, old_mtdids)))
330 /* Update the local copy of mtdparts */
333 old_mtdparts = strdup(mtdparts);
334 old_mtdids = strdup(mtdids);
337 * Remove all old parts. Note that partition removal can fail in case
338 * one of the partition is still being used by an MTD user, so this
339 * does not guarantee that all old partitions are gone.
344 * Call mtd_dev_list_updated() to clear updates generated by our own
345 * parts removal loop.
347 mtd_dev_list_updated();
349 /* If both mtdparts and mtdids are non-empty, parse */
350 if (mtdparts && mtdids) {
351 if (parse_mtdparts(mtdparts, mtdids) < 0)
352 printf("Failed parsing MTD partitions from mtdparts!\n");
355 /* Fallback to OF partitions */
356 mtd_for_each_device(mtd) {
357 if (list_empty(&mtd->partitions)) {
358 if (add_mtd_partitions_of(mtd) < 0)
359 printf("Failed parsing MTD %s OF partitions!\n",
365 * Call mtd_dev_list_updated() to clear updates generated by our own
366 * parts registration loop.
368 mtd_dev_list_updated();
373 int mtd_probe_devices(void)
375 mtd_probe_uclass_mtd_devs();
379 #endif /* defined(CONFIG_MTD_PARTITIONS) */