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