+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
+#include <env.h>
+#include <dm/device.h>
+#include <dm/uclass-internal.h>
+#include <jffs2/jffs2.h> /* LEGACY */
#include <linux/mtd/mtd.h>
-#include <jffs2/jffs2.h>
+#include <linux/mtd/partitions.h>
+#include <mtd.h>
+
+#define MTD_NAME_MAX_LEN 20
+
+void board_mtdparts_default(const char **mtdids, const char **mtdparts);
+
+static const char *get_mtdids(void)
+{
+ __maybe_unused const char *mtdparts = NULL;
+ const char *mtdids = env_get("mtdids");
+
+ if (mtdids)
+ return mtdids;
+
+#if defined(CONFIG_SYS_MTDPARTS_RUNTIME)
+ board_mtdparts_default(&mtdids, &mtdparts);
+#elif defined(MTDIDS_DEFAULT)
+ mtdids = MTDIDS_DEFAULT;
+#elif defined(CONFIG_MTDIDS_DEFAULT)
+ mtdids = CONFIG_MTDIDS_DEFAULT;
+#endif
+
+ if (mtdids)
+ env_set("mtdids", mtdids);
+
+ return mtdids;
+}
+
+/**
+ * mtd_search_alternate_name - Search an alternate name for @mtdname thanks to
+ * the mtdids legacy environment variable.
+ *
+ * The mtdids string is a list of comma-separated 'dev_id=mtd_id' tupples.
+ * Check if one of the mtd_id matches mtdname, in this case save dev_id in
+ * altname.
+ *
+ * @mtdname: Current MTD device name
+ * @altname: Alternate name to return
+ * @max_len: Length of the alternate name buffer
+ *
+ * @return 0 on success, an error otherwise.
+ */
+int mtd_search_alternate_name(const char *mtdname, char *altname,
+ unsigned int max_len)
+{
+ const char *mtdids, *equal, *comma, *dev_id, *mtd_id;
+ int dev_id_len, mtd_id_len;
+
+ mtdids = get_mtdids();
+ if (!mtdids)
+ return -EINVAL;
+
+ do {
+ /* Find the '=' sign */
+ dev_id = mtdids;
+ equal = strchr(dev_id, '=');
+ if (!equal)
+ break;
+ dev_id_len = equal - mtdids;
+ mtd_id = equal + 1;
+
+ /* Find the end of the tupple */
+ comma = strchr(mtdids, ',');
+ if (comma)
+ mtd_id_len = comma - mtd_id;
+ else
+ mtd_id_len = &mtdids[strlen(mtdids)] - mtd_id + 1;
+
+ if (!dev_id_len || !mtd_id_len)
+ return -EINVAL;
+
+ if (dev_id_len + 1 > max_len)
+ continue;
+
+ /* Compare the name we search with the current mtd_id */
+ if (!strncmp(mtdname, mtd_id, mtd_id_len)) {
+ strncpy(altname, dev_id, dev_id_len);
+ altname[dev_id_len] = 0;
+
+ return 0;
+ }
+
+ /* Go to the next tupple */
+ mtdids = comma + 1;
+ } while (comma);
+
+ return -EINVAL;
+}
+
+#if IS_ENABLED(CONFIG_DM_MTD)
+static void mtd_probe_uclass_mtd_devs(void)
+{
+ struct udevice *dev;
+ int idx = 0;
+
+ /* Probe devices with DM compliant drivers */
+ while (!uclass_find_device(UCLASS_MTD, idx, &dev) && dev) {
+ mtd_probe(dev);
+ idx++;
+ }
+}
+#else
+static void mtd_probe_uclass_mtd_devs(void) { }
+#endif
+
+#if defined(CONFIG_MTD_PARTITIONS)
+
+#define MTDPARTS_MAXLEN 512
+
+static const char *get_mtdparts(void)
+{
+ __maybe_unused const char *mtdids = NULL;
+ static char tmp_parts[MTDPARTS_MAXLEN];
+ const char *mtdparts = NULL;
+
+ if (gd->flags & GD_FLG_ENV_READY)
+ mtdparts = env_get("mtdparts");
+ else if (env_get_f("mtdparts", tmp_parts, sizeof(tmp_parts)) != -1)
+ mtdparts = tmp_parts;
+
+ if (mtdparts)
+ return mtdparts;
+
+#if defined(CONFIG_SYS_MTDPARTS_RUNTIME)
+ board_mtdparts_default(&mtdids, &mtdparts);
+#elif defined(MTDPARTS_DEFAULT)
+ mtdparts = MTDPARTS_DEFAULT;
+#elif defined(CONFIG_MTDPARTS_DEFAULT)
+ mtdparts = CONFIG_MTDPARTS_DEFAULT;
+#endif
+
+ if (mtdparts)
+ env_set("mtdparts", mtdparts);
+
+ return mtdparts;
+}
+
+static int mtd_del_parts(struct mtd_info *mtd, bool quiet)
+{
+ int ret;
+
+ if (!mtd_has_partitions(mtd))
+ return 0;
+
+ /* do not delete partitions if they are in use. */
+ if (mtd_partitions_used(mtd)) {
+ if (!quiet)
+ printf("\"%s\" partitions still in use, can't delete them\n",
+ mtd->name);
+ return -EACCES;
+ }
+
+ ret = del_mtd_partitions(mtd);
+ if (ret)
+ return ret;
+
+ return 1;
+}
+
+static bool mtd_del_all_parts_failed;
+
+static void mtd_del_all_parts(void)
+{
+ struct mtd_info *mtd;
+ int ret = 0;
+
+ mtd_del_all_parts_failed = false;
+
+ /*
+ * It is not safe to remove entries from the mtd_for_each_device loop
+ * as it uses idr indexes and the partitions removal is done in bulk
+ * (all partitions of one device at the same time), so break and
+ * iterate from start each time a new partition is found and deleted.
+ */
+ do {
+ mtd_for_each_device(mtd) {
+ ret = mtd_del_parts(mtd, false);
+ if (ret > 0)
+ break;
+ else if (ret < 0)
+ mtd_del_all_parts_failed = true;
+ }
+ } while (ret > 0);
+}
+
+int mtd_probe_devices(void)
+{
+ static char *old_mtdparts;
+ static char *old_mtdids;
+ const char *mtdparts = get_mtdparts();
+ const char *mtdids = get_mtdids();
+ const char *mtdparts_next = mtdparts;
+ struct mtd_info *mtd;
+
+ mtd_probe_uclass_mtd_devs();
+
+ /*
+ * Check if mtdparts/mtdids changed, if the MTD dev list was updated
+ * or if our previous attempt to delete existing partititions failed.
+ * In any of these cases we want to update the partitions, otherwise,
+ * everything is up-to-date and we can return 0 directly.
+ */
+ if ((!mtdparts && !old_mtdparts && !mtdids && !old_mtdids) ||
+ (mtdparts && old_mtdparts && mtdids && old_mtdids &&
+ !mtd_dev_list_updated() && !mtd_del_all_parts_failed &&
+ !strcmp(mtdparts, old_mtdparts) &&
+ !strcmp(mtdids, old_mtdids)))
+ return 0;
+
+ /* Update the local copy of mtdparts */
+ free(old_mtdparts);
+ free(old_mtdids);
+ old_mtdparts = strdup(mtdparts);
+ old_mtdids = strdup(mtdids);
+
+ /*
+ * Remove all old parts. Note that partition removal can fail in case
+ * one of the partition is still being used by an MTD user, so this
+ * does not guarantee that all old partitions are gone.
+ */
+ mtd_del_all_parts();
+
+ /*
+ * Call mtd_dev_list_updated() to clear updates generated by our own
+ * parts removal loop.
+ */
+ mtd_dev_list_updated();
+
+ /* If either mtdparts or mtdids is empty, then exit */
+ if (!mtdparts || !mtdids)
+ return 0;
+
+ /* Start the parsing by ignoring the extra 'mtdparts=' prefix, if any */
+ if (!strncmp(mtdparts, "mtdparts=", sizeof("mtdparts=") - 1))
+ mtdparts += 9;
+
+ /* For each MTD device in mtdparts */
+ for (; mtdparts[0] != '\0'; mtdparts = mtdparts_next) {
+ char mtd_name[MTD_NAME_MAX_LEN], *colon;
+ struct mtd_partition *parts;
+ unsigned int mtd_name_len;
+ int nparts, ret;
+
+ mtdparts_next = strchr(mtdparts, ';');
+ if (!mtdparts_next)
+ mtdparts_next = mtdparts + strlen(mtdparts);
+ else
+ mtdparts_next++;
+
+ colon = strchr(mtdparts, ':');
+ if (colon > mtdparts_next)
+ colon = NULL;
+
+ if (!colon) {
+ printf("Wrong mtdparts: %s\n", mtdparts);
+ return -EINVAL;
+ }
+
+ mtd_name_len = (unsigned int)(colon - mtdparts);
+ if (mtd_name_len + 1 > sizeof(mtd_name)) {
+ printf("MTD name too long: %s\n", mtdparts);
+ return -EINVAL;
+ }
+
+ strncpy(mtd_name, mtdparts, mtd_name_len);
+ mtd_name[mtd_name_len] = '\0';
+ /* Move the pointer forward (including the ':') */
+ mtdparts += mtd_name_len + 1;
+ mtd = get_mtd_device_nm(mtd_name);
+ if (IS_ERR_OR_NULL(mtd)) {
+ char linux_name[MTD_NAME_MAX_LEN];
+
+ /*
+ * The MTD device named "mtd_name" does not exist. Try
+ * to find a correspondance with an MTD device having
+ * the same type and number as defined in the mtdids.
+ */
+ debug("No device named %s\n", mtd_name);
+ ret = mtd_search_alternate_name(mtd_name, linux_name,
+ MTD_NAME_MAX_LEN);
+ if (!ret)
+ mtd = get_mtd_device_nm(linux_name);
+
+ /*
+ * If no device could be found, move the mtdparts
+ * pointer forward until the next set of partitions.
+ */
+ if (ret || IS_ERR_OR_NULL(mtd)) {
+ printf("Could not find a valid device for %s\n",
+ mtd_name);
+ mtdparts = mtdparts_next;
+ continue;
+ }
+ }
+
+ /*
+ * Call mtd_del_parts() again, even if it's already been called
+ * in mtd_del_all_parts(). We need to know if old partitions are
+ * still around (because they are still being used by someone),
+ * and if they are, we shouldn't create new partitions, so just
+ * skip this MTD device and try the next one.
+ */
+ ret = mtd_del_parts(mtd, true);
+ if (ret < 0)
+ continue;
+
+ /*
+ * Parse the MTD device partitions. It will update the mtdparts
+ * pointer, create an array of parts (that must be freed), and
+ * return the number of partition structures in the array.
+ */
+ ret = mtd_parse_partitions(mtd, &mtdparts, &parts, &nparts);
+ if (ret) {
+ printf("Could not parse device %s\n", mtd->name);
+ put_mtd_device(mtd);
+ return -EINVAL;
+ }
+
+ if (!nparts)
+ continue;
+
+ /* Create the new MTD partitions */
+ add_mtd_partitions(mtd, parts, nparts);
+
+ /* Free the structures allocated during the parsing */
+ mtd_free_parsed_partitions(parts, nparts);
+
+ put_mtd_device(mtd);
+ }
+
+ /*
+ * Call mtd_dev_list_updated() to clear updates generated by our own
+ * parts registration loop.
+ */
+ mtd_dev_list_updated();
+
+ return 0;
+}
+#else
+int mtd_probe_devices(void)
+{
+ mtd_probe_uclass_mtd_devs();
+
+ return 0;
+}
+#endif /* defined(CONFIG_MTD_PARTITIONS) */
+
+/* Legacy */
static int get_part(const char *partname, int *idx, loff_t *off, loff_t *size,
loff_t *maxsize, int devtype)
return 0;
#else
- puts("offset is not a number\n");
+ puts("mtdparts support missing.\n");
return -1;
#endif
}
projects / oweals / u-boot.git / blobdiff