Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753931Ab2K2LrU (ORCPT ); Thu, 29 Nov 2012 06:47:20 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:59432 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751692Ab2K2LrS (ORCPT ); Thu, 29 Nov 2012 06:47:18 -0500 From: "Philip, Avinash" To: , , , , , , CC: , , , , , , , , , "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> X-Mailer: git-send-email 1.7.0.4 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2011 Lines: 49 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/