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>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
index 283d887f7825..952e956ef01d 100644
--- a/drivers/mtd/devices/Kconfig
+++ b/drivers/mtd/devices/Kconfig
@@ -251,6 +251,8 @@ config MTD_DOC2001PLUS
 
 config MTD_DOCG3
         tristate "M-Systems Disk-On-Chip G3"
+        select BCH
+        select BCH_CONST_PARAMS
         ---help---
           This provides an MTD device driver for the M-Systems DiskOnChip
           G3 devices.
@@ -259,6 +261,13 @@ config MTD_DOCG3
           M-Systems and now Sandisk. The support is very experimental,
           and doesn't give access to any write operations.
 
+if MTD_DOCG3
+config BCH_CONST_M
+        default 14
+config BCH_CONST_T
+        default 4
+endif
+
 config MTD_DOCPROBE
         tristate
         select MTD_DOCECC