1 // SPDX-License-Identifier: GPL-2.0+
4 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
8 #include <dm/uclass-internal.h>
9 #include <jffs2/jffs2.h> /* LEGACY */
10 #include <linux/mtd/mtd.h>
11 #include <linux/mtd/partitions.h>
14 #define MTD_NAME_MAX_LEN 20
18 * mtd_search_alternate_name - Search an alternate name for @mtdname thanks to
19 * the mtdids legacy environment variable.
21 * The mtdids string is a list of comma-separated 'dev_id=mtd_id' tupples.
22 * Check if one of the mtd_id matches mtdname, in this case save dev_id in
25 * @mtdname: Current MTD device name
26 * @altname: Alternate name to return
27 * @max_len: Length of the alternate name buffer
29 * @return 0 on success, an error otherwise.
31 int mtd_search_alternate_name(const char *mtdname, char *altname,
34 const char *mtdids, *equal, *comma, *dev_id, *mtd_id;
35 int dev_id_len, mtd_id_len;
37 mtdids = env_get("mtdids");
42 /* Find the '=' sign */
44 equal = strchr(dev_id, '=');
47 dev_id_len = equal - mtdids;
50 /* Find the end of the tupple */
51 comma = strchr(mtdids, ',');
53 mtd_id_len = comma - mtd_id;
55 mtd_id_len = &mtdids[strlen(mtdids)] - mtd_id + 1;
57 if (!dev_id_len || !mtd_id_len)
60 if (dev_id_len + 1 > max_len)
63 /* Compare the name we search with the current mtd_id */
64 if (!strncmp(mtdname, mtd_id, mtd_id_len)) {
65 strncpy(altname, dev_id, dev_id_len);
66 altname[dev_id_len] = 0;
71 /* Go to the next tupple */
78 #if IS_ENABLED(CONFIG_MTD)
79 static void mtd_probe_uclass_mtd_devs(void)
84 /* Probe devices with DM compliant drivers */
85 while (!uclass_find_device(UCLASS_MTD, idx, &dev) && dev) {
91 static void mtd_probe_uclass_mtd_devs(void) { }
94 #if defined(CONFIG_MTD_PARTITIONS)
95 extern void board_mtdparts_default(const char **mtdids,
96 const char **mtdparts);
98 static const char *get_mtdids(void)
100 __maybe_unused const char *mtdparts = NULL;
101 const char *mtdids = env_get("mtdids");
106 #if defined(CONFIG_SYS_MTDPARTS_RUNTIME)
107 board_mtdparts_default(&mtdids, &mtdparts);
108 #elif defined(MTDIDS_DEFAULT)
109 mtdids = MTDIDS_DEFAULT;
110 #elif defined(CONFIG_MTDIDS_DEFAULT)
111 mtdids = CONFIG_MTDIDS_DEFAULT;
115 env_set("mtdids", mtdids);
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 static bool use_defaults = true;
127 const char *mtdparts = NULL;
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;
134 if (mtdparts || !use_defaults)
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;
146 env_set("mtdparts", mtdparts);
148 use_defaults = false;
153 int mtd_probe_devices(void)
155 static char *old_mtdparts;
156 static char *old_mtdids;
157 const char *mtdparts = get_mtdparts();
158 const char *mtdids = get_mtdids();
159 bool remaining_partitions = true;
160 struct mtd_info *mtd;
162 mtd_probe_uclass_mtd_devs();
165 * Check if mtdparts/mtdids changed or if the MTD dev list was updated
166 * since last call, otherwise: exit
168 if ((!mtdparts && !old_mtdparts && !mtdids && !old_mtdids) ||
169 (mtdparts && old_mtdparts && mtdids && old_mtdids &&
170 !mtd_dev_list_updated() &&
171 !strcmp(mtdparts, old_mtdparts) &&
172 !strcmp(mtdids, old_mtdids)))
175 /* Update the local copy of mtdparts */
178 old_mtdparts = strdup(mtdparts);
179 old_mtdids = strdup(mtdids);
181 /* If at least one partition is still in use, do not delete anything */
182 mtd_for_each_device(mtd) {
184 printf("Partition \"%s\" already in use, aborting\n",
191 * Everything looks clear, remove all partitions. It is not safe to
192 * remove entries from the mtd_for_each_device loop as it uses idr
193 * indexes and the partitions removal is done in bulk (all partitions of
194 * one device at the same time), so break and iterate from start each
195 * time a new partition is found and deleted.
197 while (remaining_partitions) {
198 remaining_partitions = false;
199 mtd_for_each_device(mtd) {
200 if (!mtd_is_partition(mtd) && mtd_has_partitions(mtd)) {
201 del_mtd_partitions(mtd);
202 remaining_partitions = true;
209 * Call mtd_dev_list_updated() to clear updates generated by our own
210 * parts removal loop.
212 mtd_dev_list_updated();
214 /* If either mtdparts or mtdids is empty, then exit */
215 if (!mtdparts || !mtdids)
218 /* Start the parsing by ignoring the extra 'mtdparts=' prefix, if any */
219 if (strstr(mtdparts, "mtdparts="))
222 /* For each MTD device in mtdparts */
223 while (mtdparts[0] != '\0') {
224 char mtd_name[MTD_NAME_MAX_LEN], *colon;
225 struct mtd_partition *parts;
226 int mtd_name_len, nparts;
229 colon = strchr(mtdparts, ':');
231 printf("Wrong mtdparts: %s\n", mtdparts);
235 mtd_name_len = colon - mtdparts;
236 strncpy(mtd_name, mtdparts, mtd_name_len);
237 mtd_name[mtd_name_len] = '\0';
238 /* Move the pointer forward (including the ':') */
239 mtdparts += mtd_name_len + 1;
240 mtd = get_mtd_device_nm(mtd_name);
241 if (IS_ERR_OR_NULL(mtd)) {
242 char linux_name[MTD_NAME_MAX_LEN];
245 * The MTD device named "mtd_name" does not exist. Try
246 * to find a correspondance with an MTD device having
247 * the same type and number as defined in the mtdids.
249 debug("No device named %s\n", mtd_name);
250 ret = mtd_search_alternate_name(mtd_name, linux_name,
253 mtd = get_mtd_device_nm(linux_name);
256 * If no device could be found, move the mtdparts
257 * pointer forward until the next set of partitions.
259 if (ret || IS_ERR_OR_NULL(mtd)) {
260 printf("Could not find a valid device for %s\n",
262 mtdparts = strchr(mtdparts, ';');
271 * Parse the MTD device partitions. It will update the mtdparts
272 * pointer, create an array of parts (that must be freed), and
273 * return the number of partition structures in the array.
275 ret = mtd_parse_partitions(mtd, &mtdparts, &parts, &nparts);
277 printf("Could not parse device %s\n", mtd->name);
285 /* Create the new MTD partitions */
286 add_mtd_partitions(mtd, parts, nparts);
288 /* Free the structures allocated during the parsing */
289 mtd_free_parsed_partitions(parts, nparts);
295 * Call mtd_dev_list_updated() to clear updates generated by our own
296 * parts registration loop.
298 mtd_dev_list_updated();
303 int mtd_probe_devices(void)
305 mtd_probe_uclass_mtd_devs();
309 #endif /* defined(CONFIG_MTD_PARTITIONS) */
313 static int get_part(const char *partname, int *idx, loff_t *off, loff_t *size,
314 loff_t *maxsize, int devtype)
316 #ifdef CONFIG_CMD_MTDPARTS
317 struct mtd_device *dev;
318 struct part_info *part;
322 ret = mtdparts_init();
326 ret = find_dev_and_part(partname, &dev, &pnum, &part);
330 if (dev->id->type != devtype) {
331 printf("not same typ %d != %d\n", dev->id->type, devtype);
337 *maxsize = part->size;
342 puts("mtdparts support missing.\n");
347 int mtd_arg_off(const char *arg, int *idx, loff_t *off, loff_t *size,
348 loff_t *maxsize, int devtype, uint64_t chipsize)
350 if (!str2off(arg, off))
351 return get_part(arg, idx, off, size, maxsize, devtype);
353 if (*off >= chipsize) {
354 puts("Offset exceeds device limit\n");
358 *maxsize = chipsize - *off;
363 int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
364 loff_t *size, loff_t *maxsize, int devtype,
376 ret = mtd_arg_off(argv[0], idx, off, size, maxsize, devtype,
384 if (!str2off(argv[1], size)) {
385 printf("'%s' is not a number\n", argv[1]);
389 if (*size > *maxsize) {
390 puts("Size exceeds partition or device limit\n");
395 printf("device %d ", *idx);
396 if (*size == chipsize)
397 puts("whole chip\n");
399 printf("offset 0x%llx, size 0x%llx\n",
400 (unsigned long long)*off, (unsigned long long)*size);