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| author | Robert Jarzmik <robert.jarzmik@free.fr> | 2011-11-19 16:02:55 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-01-09 18:07:26 +0000 |
| commit | d13d19ece39f20bf097782e1812a9c31a5a4fcf1 (patch) | |
| tree | 8ea5f606a95f7e3761e55945f247c818dfb0dfc0 /drivers/mtd/devices/docg3.h | |
| parent | 7a7fcf14021bc0f0728dd0aaa2635475de0db54c (diff) | |
| download | op-kernel-dev-d13d19ece39f20bf097782e1812a9c31a5a4fcf1.zip op-kernel-dev-d13d19ece39f20bf097782e1812a9c31a5a4fcf1.tar.gz | |
mtd: docg3: add ECC correction code
Credit for discovering the BCH algorith parameters, and bit
reversing algorithm is to be give to Mike Dunn and Ivan
Djelic.
The BCH correction code relied upon the BCH library, where
all data and ECC is bit-reversed. The BCH library works
correctly when each input byte is bit-reversed, and
accordingly ECC output is also bit-reversed.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Reviewed-by: Ivan Djelic <ivan.djelic@parrot.com>
Reviewed-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/devices/docg3.h')
| -rw-r--r-- | drivers/mtd/devices/docg3.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/mtd/devices/docg3.h b/drivers/mtd/devices/docg3.h index 397e461..33db727 100644 --- a/drivers/mtd/devices/docg3.h +++ b/drivers/mtd/devices/docg3.h @@ -51,10 +51,19 @@ #define DOC_LAYOUT_WEAR_OFFSET (DOC_LAYOUT_PAGE_OOB_SIZE * 2) #define DOC_LAYOUT_BLOCK_SIZE \ (DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_PAGE_SIZE) + +/* + * ECC related constants + */ +#define DOC_ECC_BCH_M 14 +#define DOC_ECC_BCH_T 4 +#define DOC_ECC_BCH_PRIMPOLY 0x4443 #define DOC_ECC_BCH_SIZE 7 #define DOC_ECC_BCH_COVERED_BYTES \ (DOC_LAYOUT_PAGE_SIZE + DOC_LAYOUT_OOB_PAGEINFO_SZ + \ - DOC_LAYOUT_OOB_HAMMING_SZ + DOC_LAYOUT_OOB_BCH_SZ) + DOC_LAYOUT_OOB_HAMMING_SZ) +#define DOC_ECC_BCH_TOTAL_BYTES \ + (DOC_ECC_BCH_COVERED_BYTES + DOC_LAYOUT_OOB_BCH_SZ) /* * Blocks distribution |
