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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014
* Heiko Schocher, DENX Software Engineering, hs@denx.de.
*/
#include <common.h>
#include <env.h>
#include <malloc.h>
#include <dm/device.h>
#include <dm/uclass-internal.h>
#include <linux/err.h>
#include <linux/mtd/mtd.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) */