From dc339bf784f08707583a5b6465381354f48d4fa8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marek=20Beh=C3=BAn?= Date: Wed, 26 May 2021 14:08:19 +0200 Subject: [PATCH] mtd: add support for parsing partitions defined in OF MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add support for parsing partitions defined in device-trees via the `partitions` node with `fixed-partitions` compatible. The `mtdparts`/`mtdids` mechanism takes precedence. If some partitions are defined for a MTD device via this mechanism, the code won't register partitions for that MTD device from OF, even if they are defined. Signed-off-by: Marek Behún Reviewed-by: Miquel Raynal Tested-by: Patrice Chotard Reviewed-by: Jagan Teki Cc: Simon Glass Cc: Heiko Schocher Cc: Patrick Delaunay --- drivers/mtd/mtd_uboot.c | 106 +++++++++++++++++++++++----------------- drivers/mtd/mtdpart.c | 63 ++++++++++++++++++++++++ include/linux/mtd/mtd.h | 10 ++++ 3 files changed, 135 insertions(+), 44 deletions(-) diff --git a/drivers/mtd/mtd_uboot.c b/drivers/mtd/mtd_uboot.c index c53ec657a3..4843cf1b84 100644 --- a/drivers/mtd/mtd_uboot.c +++ b/drivers/mtd/mtd_uboot.c @@ -198,53 +198,11 @@ static void mtd_del_all_parts(void) } while (ret > 0); } -int mtd_probe_devices(void) +static int parse_mtdparts(const char *mtdparts, const char *mtdids) { - static char *old_mtdparts; - static char *old_mtdids; - const char *mtdparts = get_mtdparts(); - const char *mtdids = get_mtdids(); - const char *mtdparts_next = mtdparts; + const char *mtdparts_next; 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; @@ -343,6 +301,66 @@ int mtd_probe_devices(void) put_mtd_device(mtd); } + return 0; +} + +int mtd_probe_devices(void) +{ + static char *old_mtdparts; + static char *old_mtdids; + const char *mtdparts = get_mtdparts(); + const char *mtdids = get_mtdids(); + 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 both mtdparts and mtdids are non-empty, parse */ + if (mtdparts && mtdids) { + if (parse_mtdparts(mtdparts, mtdids) < 0) + printf("Failed parsing MTD partitions from mtdparts!\n"); + } + + /* Fallback to OF partitions */ + mtd_for_each_device(mtd) { + if (list_empty(&mtd->partitions)) { + if (add_mtd_partitions_of(mtd) < 0) + printf("Failed parsing MTD %s OF partitions!\n", + mtd->name); + } + } + /* * Call mtd_dev_list_updated() to clear updates generated by our own * parts registration loop. diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index d064ac3048..aa58f722da 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -892,6 +892,69 @@ int add_mtd_partitions(struct mtd_info *master, return 0; } +#if CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(OF_CONTROL) +int add_mtd_partitions_of(struct mtd_info *master) +{ + ofnode parts, child; + int i = 0; + + if (!master->dev) + return 0; + + parts = ofnode_find_subnode(mtd_get_ofnode(master), "partitions"); + if (!ofnode_valid(parts) || !ofnode_is_available(parts) || + !ofnode_device_is_compatible(parts, "fixed-partitions")) + return 0; + + ofnode_for_each_subnode(child, parts) { + struct mtd_partition part = { 0 }; + struct mtd_info *slave; + fdt_addr_t offset, size; + + if (!ofnode_is_available(child)) + continue; + + offset = ofnode_get_addr_size_index_notrans(child, 0, &size); + if (offset == FDT_ADDR_T_NONE || !size) { + debug("Missing partition offset/size on \"%s\" partition\n", + master->name); + continue; + } + + part.name = ofnode_read_string(child, "label"); + if (!part.name) + part.name = ofnode_read_string(child, "name"); + + /* + * .mask_flags is used to remove flags in allocate_partition(), + * so when "read-only" is present, we add MTD_WRITABLE to the + * mask, and so MTD_WRITABLE will be removed on partition + * allocation + */ + if (ofnode_read_bool(child, "read-only")) + part.mask_flags |= MTD_WRITEABLE; + if (ofnode_read_bool(child, "lock")) + part.mask_flags |= MTD_POWERUP_LOCK; + + part.offset = offset; + part.size = size; + part.ecclayout = master->ecclayout; + + slave = allocate_partition(master, &part, i++, 0); + if (IS_ERR(slave)) + return PTR_ERR(slave); + + mutex_lock(&mtd_partitions_mutex); + list_add_tail(&slave->node, &master->partitions); + mutex_unlock(&mtd_partitions_mutex); + + add_mtd_device(slave); + } + + return 0; +} +#endif /* CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(OF_CONTROL) */ + #ifndef __UBOOT__ static DEFINE_SPINLOCK(part_parser_lock); static LIST_HEAD(part_parsers); diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 927854950a..3b302fb8c3 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -581,6 +581,16 @@ static inline int del_mtd_partitions(struct mtd_info *mtd) } #endif +#if defined(CONFIG_MTD_PARTITIONS) && CONFIG_IS_ENABLED(DM) && \ + CONFIG_IS_ENABLED(OF_CONTROL) +int add_mtd_partitions_of(struct mtd_info *master); +#else +static inline int add_mtd_partitions_of(struct mtd_info *master) +{ + return 0; +} +#endif + struct mtd_info *__mtd_next_device(int i); #define mtd_for_each_device(mtd) \ for ((mtd) = __mtd_next_device(0); \