diff options
Diffstat (limited to 'target/linux/generic/patches-4.3/404-mtd-add-more-helper-functions.patch')
| -rw-r--r-- | target/linux/generic/patches-4.3/404-mtd-add-more-helper-functions.patch | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.3/404-mtd-add-more-helper-functions.patch b/target/linux/generic/patches-4.3/404-mtd-add-more-helper-functions.patch new file mode 100644 index 0000000..243e4e2 --- /dev/null +++ b/target/linux/generic/patches-4.3/404-mtd-add-more-helper-functions.patch @@ -0,0 +1,101 @@ +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -453,14 +453,12 @@ static struct mtd_part *allocate_partiti + if (slave->offset == MTDPART_OFS_APPEND) + slave->offset = cur_offset; + if (slave->offset == MTDPART_OFS_NXTBLK) { +- slave->offset = cur_offset; +- if (mtd_mod_by_eb(cur_offset, master) != 0) { +- /* Round up to next erasesize */ +- slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize; ++ /* Round up to next erasesize */ ++ slave->offset = mtd_roundup_to_eb(cur_offset, master); ++ if (slave->offset != cur_offset) + printk(KERN_NOTICE "Moving partition %d: " + "0x%012llx -> 0x%012llx\n", partno, + (unsigned long long)cur_offset, (unsigned long long)slave->offset); +- } + } + if (slave->offset == MTDPART_OFS_RETAIN) { + slave->offset = cur_offset; +@@ -687,6 +685,17 @@ run_parsers_by_type(struct mtd_part *sla + return nr_parts; + } + ++static inline unsigned long ++mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len) ++{ ++ unsigned long mask = mtd->erasesize - 1; ++ ++ len += offset & mask; ++ len = (len + mask) & ~mask; ++ len -= offset & mask; ++ return len; ++} ++ + #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME + #define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME + #else +@@ -973,6 +982,24 @@ int mtd_is_partition(const struct mtd_in + } + EXPORT_SYMBOL_GPL(mtd_is_partition); + ++struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd) ++{ ++ if (!mtd_is_partition(mtd)) ++ return (struct mtd_info *)mtd; ++ ++ return PART(mtd)->master; ++} ++EXPORT_SYMBOL_GPL(mtdpart_get_master); ++ ++uint64_t mtdpart_get_offset(const struct mtd_info *mtd) ++{ ++ if (!mtd_is_partition(mtd)) ++ return 0; ++ ++ return PART(mtd)->offset; ++} ++EXPORT_SYMBOL_GPL(mtdpart_get_offset); ++ + /* Returns the size of the entire flash chip */ + uint64_t mtd_get_device_size(const struct mtd_info *mtd) + { +--- a/include/linux/mtd/partitions.h ++++ b/include/linux/mtd/partitions.h +@@ -90,6 +90,8 @@ int mtd_is_partition(const struct mtd_in + int mtd_add_partition(struct mtd_info *master, const char *name, + long long offset, long long length); + int mtd_del_partition(struct mtd_info *master, int partno); ++struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd); ++uint64_t mtdpart_get_offset(const struct mtd_info *mtd); + uint64_t mtd_get_device_size(const struct mtd_info *mtd); + extern void __weak arch_split_mtd_part(struct mtd_info *master, + const char *name, int offset, int size); +--- a/include/linux/mtd/mtd.h ++++ b/include/linux/mtd/mtd.h +@@ -334,6 +334,24 @@ static inline uint32_t mtd_mod_by_eb(uin + return do_div(sz, mtd->erasesize); + } + ++static inline uint64_t mtd_roundup_to_eb(uint64_t sz, struct mtd_info *mtd) ++{ ++ if (mtd_mod_by_eb(sz, mtd) == 0) ++ return sz; ++ ++ /* Round up to next erase block */ ++ return (mtd_div_by_eb(sz, mtd) + 1) * mtd->erasesize; ++} ++ ++static inline uint64_t mtd_rounddown_to_eb(uint64_t sz, struct mtd_info *mtd) ++{ ++ if (mtd_mod_by_eb(sz, mtd) == 0) ++ return sz; ++ ++ /* Round down to the start of the current erase block */ ++ return (mtd_div_by_eb(sz, mtd)) * mtd->erasesize; ++} ++ + static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd) + { + if (mtd->writesize_shift) |