linux-kernel - [PATCH v3 0/3] mtd: nand: OMAP: ELM error correction support for BCH ecc

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Date:	Thu, 29 Nov 2012 17:16:31 +0530
From:	"Philip, Avinash" <avinashphilip@...com>
To:	<dwmw2@...radead.org>, <artem.bityutskiy@...ux.intel.com>,
	<afzal@...com>, <tony@...mide.com>,
	<broonie@...nsource.wolfsonmicro.com>,
	<rmk+kernel@....linux.org.uk>, <gregkh@...uxfoundation.org>
CC:	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>,
	<gururaja.hebbar@...com>, <ivan.djelic@...rot.com>,
	"Philip, Avinash" <avinashphilip@...com>
Subject: [PATCH v3 0/3] mtd: nand: OMAP: ELM error correction support for BCH ecc

Support to use ELM as BCH 4 & 8 bit error correction module. Also performance
enhancement by adding single shot read_page and write_page functions for the
nand flashes with page size less than 4 KB.

ELM module can be used to correct errors reported by BCH 4, 8 & 16 bit
ECC scheme. For now only 4 & 8 bit support is added.

BCH 4 & 8 bit error detection support is already available in mainline
kernel and works with software error correction.

This series is based on [1] and tested with RFC: OMAP GPMC bindings
patch series

1. linux-next/20121129

Tested on am335x-evm for BCH 4 and 8 bit error correction.

Changes since v1:
	- Erased page is identified by checking byte [13/7] in read
	  ecc. To filter out bit flips in OOB area, check 0 bits in
	  the byte greater than 4.
	- GPMC ecc engine configuration moves to omap2.c NAND driver.

Changes since v2:
	- Added runtime detection of elm module, instead of depending
	  on platform data.
	- Added bit flip correction in OOB ecc data if bit flip happen
	  OOB data.

Philip, Avinash (3):
  mtd: nand: omap2: Update nerrors using ecc.strength
  mtd: devices: elm: Add support for ELM error correction
  mtd: nand: omap2: Support for hardware BCH error correction.

 Documentation/devicetree/bindings/mtd/elm.txt |   17 +
 drivers/mtd/devices/Makefile                  |    4 +-
 drivers/mtd/devices/elm.c                     |  418 ++++++++++++++++++
 drivers/mtd/nand/omap2.c                      |  563 +++++++++++++++++++++++--
 include/linux/platform_data/elm.h             |   55 +++
 5 files changed, 1017 insertions(+), 41 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mtd/elm.txt
 create mode 100644 drivers/mtd/devices/elm.c
 create mode 100644 include/linux/platform_data/elm.h

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