From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pekon Gupta Subject: [PATCH v10 02/10] mtd: nand: omap: combine different flavours of 1-bit hamming ecc schemes Date: Sat, 19 Oct 2013 14:14:06 +0530 Message-ID: <1382172254-12448-3-git-send-email-pekon@ti.com> References: <1382172254-12448-1-git-send-email-pekon@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1382172254-12448-1-git-send-email-pekon-l0cyMroinI0@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: mark.rutland-5wv7dgnIgG8@public.gmane.org, olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org, computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, dedekind1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org Cc: robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, Pawel.Moll-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org, swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org, dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org, bcousson-rdvid1DuHRBWk0Htik3J/w@public.gmane.org, avinashphilipk-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, balbi-l0cyMroinI0@public.gmane.org, linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, jp.francois-JOfcSVQZ0GHQT0dZR+AlfA@public.gmane.org, ivan.djelic-ITF29qwbsa/QT0dZR+AlfA@public.gmane.org, Pekon Gupta List-Id: linux-omap@vger.kernel.org OMAP NAND driver currently supports multiple flavours of 1-bit Hamming ecc-scheme, like: - OMAP_ECC_HAMMING_CODE_DEFAULT 1-bit hamming ecc code using software library - OMAP_ECC_HAMMING_CODE_HW 1-bit hamming ecc-code using GPMC h/w engine - OMAP_ECC_HAMMING_CODE_HW_ROMCODE 1-bit hamming ecc-code using GPMC h/w engin with ecc-layout compatible to ROM code. This patch combines above multiple ecc-schemes into single implementation: - OMAP_ECC_HAM1_CODE_HW 1-bit hamming ecc-code using GPMC h/w engine with ROM-code compatible ecc-layout. Signed-off-by: Pekon Gupta Reviewed-by: Felipe Balbi Acked-by: Tony Lindgren --- Documentation/devicetree/bindings/mtd/gpmc-nand.txt | 8 ++++---- arch/arm/mach-omap2/board-flash.c | 2 +- drivers/mtd/nand/omap2.c | 9 +++------ include/linux/platform_data/mtd-nand-omap2.h | 7 +------ 4 files changed, 9 insertions(+), 17 deletions(-) diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt index bfe07e1..5e1f31b 100644 --- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt +++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt @@ -22,10 +22,10 @@ Optional properties: width of 8 is assumed. - ti,nand-ecc-opt: A string setting the ECC layout to use. One of: - - "sw" Software method (default) - "hw" Hardware method - "hw-romcode" gpmc hamming mode method & romcode layout + "sw" use "ham1" instead + "hw" use "ham1" instead + "hw-romcode" use "ham1" instead + "ham1" 1-bit Hamming ecc code "bch4" 4-bit BCH ecc code "bch8" 8-bit BCH ecc code diff --git a/arch/arm/mach-omap2/board-flash.c b/arch/arm/mach-omap2/board-flash.c index fc20a61..ac82512 100644 --- a/arch/arm/mach-omap2/board-flash.c +++ b/arch/arm/mach-omap2/board-flash.c @@ -142,7 +142,7 @@ __init board_nand_init(struct mtd_partition *nand_parts, u8 nr_parts, u8 cs, board_nand_data.nr_parts = nr_parts; board_nand_data.devsize = nand_type; - board_nand_data.ecc_opt = OMAP_ECC_HAMMING_CODE_DEFAULT; + board_nand_data.ecc_opt = OMAP_ECC_BCH8_CODE_HW; gpmc_nand_init(&board_nand_data, gpmc_t); } #endif /* CONFIG_MTD_NAND_OMAP2 || CONFIG_MTD_NAND_OMAP2_MODULE */ diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index 4ecf0e5..8d521aa 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -1993,10 +1993,7 @@ static int omap_nand_probe(struct platform_device *pdev) } /* select the ecc type */ - if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_DEFAULT) - info->nand.ecc.mode = NAND_ECC_SOFT; - else if ((pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW) || - (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE)) { + if (pdata->ecc_opt == OMAP_ECC_HAM1_CODE_HW) { info->nand.ecc.bytes = 3; info->nand.ecc.size = 512; info->nand.ecc.strength = 1; @@ -2025,7 +2022,7 @@ static int omap_nand_probe(struct platform_device *pdev) } /* rom code layout */ - if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE) { + if (pdata->ecc_opt == OMAP_ECC_HAM1_CODE_HW) { if (info->nand.options & NAND_BUSWIDTH_16) offset = 2; @@ -2033,7 +2030,7 @@ static int omap_nand_probe(struct platform_device *pdev) offset = 1; info->nand.badblock_pattern = &bb_descrip_flashbased; } - omap_oobinfo.eccbytes = 3 * (info->mtd.oobsize/16); + omap_oobinfo.eccbytes = 3 * (info->mtd.writesize / 512); for (i = 0; i < omap_oobinfo.eccbytes; i++) omap_oobinfo.eccpos[i] = i+offset; diff --git a/include/linux/platform_data/mtd-nand-omap2.h b/include/linux/platform_data/mtd-nand-omap2.h index e4128f1..4da5bfa 100644 --- a/include/linux/platform_data/mtd-nand-omap2.h +++ b/include/linux/platform_data/mtd-nand-omap2.h @@ -23,13 +23,8 @@ enum nand_io { }; enum omap_ecc { - /* 1-bit ecc: stored at end of spare area */ - OMAP_ECC_HAMMING_CODE_DEFAULT = 0, /* Default, s/w method */ - OMAP_ECC_HAMMING_CODE_HW, /* gpmc to detect the error */ - /* 1-bit ecc: stored at beginning of spare area as romcode */ - OMAP_ECC_HAMMING_CODE_HW_ROMCODE, /* gpmc method & romcode layout */ /* 1-bit ECC calculation by GPMC, Error detection by Software */ - OMAP_ECC_HAM1_CODE_HW, + OMAP_ECC_HAM1_CODE_HW = 0, /* 4-bit ECC calculation by GPMC, Error detection by Software */ OMAP_ECC_BCH4_CODE_HW_DETECTION_SW, /* 4-bit ECC calculation by GPMC, Error detection by ELM */ -- 1.8.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html