From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Philip, Avinash" Subject: [PATCH v3 0/3] mtd: nand: OMAP: ELM error correction support for BCH ecc Date: Thu, 29 Nov 2012 17:16:31 +0530 Message-ID: <1354189595-12784-1-git-send-email-avinashphilip@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, artem.bityutskiy-VuQAYsv1563Yd54FQh9/CA@public.gmane.org, afzal-l0cyMroinI0@public.gmane.org, tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org, broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org, rmk+kernel-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org Cc: linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, nsekhar-l0cyMroinI0@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, gururaja.hebbar-l0cyMroinI0@public.gmane.org, linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, "Philip, Avinash" , ivan.djelic-ITF29qwbsa/QT0dZR+AlfA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org 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