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This backports upstream support for "compatible" DT property set for the "partitions" subnode of flash node. It allows specifying how partitions should be created/parsed. Right now only "fixed-partitions" is supported. It should eventually replace our downstream "linux,part-probe" solution. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
95 lines
2.8 KiB
Diff
95 lines
2.8 KiB
Diff
From: Gabor Juhos <juhosg@openwrt.org>
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Subject: kernel/3.10: add separate rootfs partition parser
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lede-commit: daec7ad7688415156e2730e401503d09bd3acf91
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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---
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drivers/mtd/mtdpart.c | 29 +++++++++++++++++++++++++++++
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include/linux/mtd/mtd.h | 18 ++++++++++++++++++
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include/linux/mtd/partitions.h | 2 ++
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3 files changed, 49 insertions(+)
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -792,6 +792,17 @@ run_parsers_by_type(struct mtd_part *sla
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return nr_parts;
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}
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+static inline unsigned long
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+mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
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+{
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+ unsigned long mask = mtd->erasesize - 1;
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+
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+ len += offset & mask;
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+ len = (len + mask) & ~mask;
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+ len -= offset & mask;
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+ return len;
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+}
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+
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#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
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#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
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#else
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@@ -1205,6 +1216,24 @@ int mtd_is_partition(const struct mtd_in
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}
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EXPORT_SYMBOL_GPL(mtd_is_partition);
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+struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd)
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+{
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+ if (!mtd_is_partition(mtd))
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+ return (struct mtd_info *)mtd;
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+
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+ return mtd_to_part(mtd)->parent;
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+}
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+EXPORT_SYMBOL_GPL(mtdpart_get_master);
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+
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+uint64_t mtdpart_get_offset(const struct mtd_info *mtd)
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+{
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+ if (!mtd_is_partition(mtd))
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+ return 0;
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+
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+ return mtd_to_part(mtd)->offset;
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+}
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+EXPORT_SYMBOL_GPL(mtdpart_get_offset);
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+
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/* Returns the size of the entire flash chip */
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uint64_t mtd_get_device_size(const struct mtd_info *mtd)
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{
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--- a/include/linux/mtd/mtd.h
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+++ b/include/linux/mtd/mtd.h
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@@ -485,6 +485,24 @@ static inline uint32_t mtd_mod_by_eb(uin
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return do_div(sz, mtd->erasesize);
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}
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+static inline uint64_t mtd_roundup_to_eb(uint64_t sz, struct mtd_info *mtd)
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+{
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+ if (mtd_mod_by_eb(sz, mtd) == 0)
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+ return sz;
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+
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+ /* Round up to next erase block */
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+ return (mtd_div_by_eb(sz, mtd) + 1) * mtd->erasesize;
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+}
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+
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+static inline uint64_t mtd_rounddown_to_eb(uint64_t sz, struct mtd_info *mtd)
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+{
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+ if (mtd_mod_by_eb(sz, mtd) == 0)
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+ return sz;
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+
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+ /* Round down to the start of the current erase block */
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+ return (mtd_div_by_eb(sz, mtd)) * mtd->erasesize;
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+}
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+
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static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->writesize_shift)
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--- a/include/linux/mtd/partitions.h
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+++ b/include/linux/mtd/partitions.h
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@@ -115,6 +115,8 @@ int mtd_is_partition(const struct mtd_in
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int mtd_add_partition(struct mtd_info *master, const char *name,
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long long offset, long long length);
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int mtd_del_partition(struct mtd_info *master, int partno);
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+struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd);
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+uint64_t mtdpart_get_offset(const struct mtd_info *mtd);
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uint64_t mtd_get_device_size(const struct mtd_info *mtd);
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extern void __weak arch_split_mtd_part(struct mtd_info *master,
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const char *name, int offset, int size);
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