[PATCH v5 5/5] omap: nand: making ecc layout as compatible with romcode ecc
From: Sukumar Ghorai <hidden>
Date: 2010-09-27 13:37:14
Also in:
linux-omap
Subsystem:
memory technology devices (mtd), nand flash subsystem, the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Linus Torvalds
This patch overrides nand ecc layout and bad block descriptor (for 8-bit
device) to support hw ecc in romcode layout. So as to have in sync with ecc
layout throughout; i.e. x-loader, u-boot and kernel.
This patch also enables to use romcode ecc for spd and zoom, by default.
This enables to flash x-loader, u-boot, kernel, FS images from kernel itself
and compatiable with other tools.
Signed-off-by: Vimal Singh <redacted>
Signed-off-by: Sukumar Ghorai <redacted>
---
drivers/mtd/nand/omap2.c | 34 ++++++++++++++++++++++++++++++++++
1 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 3fd9ee0..9ccfd88 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c@@ -128,6 +128,20 @@ const int use_dma; const int use_interrupt; #endif +/* oob info generated runtime depending on ecc algorithm and layout selected */ +static struct nand_ecclayout omap_oobinfo; +/* Define some generic bad / good block scan pattern which are used + * while scanning a device for factory marked good / bad blocks + */ +static uint8_t scan_ff_pattern[] = { 0xff }; +static struct nand_bbt_descr bb_descrip_flashbased = { + .options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES, + .offs = 0, + .len = 1, + .pattern = scan_ff_pattern, +}; + + struct omap_nand_info { struct nand_hw_control controller; struct omap_nand_platform_data *pdata;
@@ -946,6 +960,7 @@ static int __devinit omap_nand_probe(struct platform_device *pdev) struct omap_nand_info *info; struct omap_nand_platform_data *pdata; int err; + int i, offset; pdata = pdev->dev.platform_data; if (pdata == NULL) {
@@ -1079,6 +1094,25 @@ static int __devinit omap_nand_probe(struct platform_device *pdev) } } + /* rom code layout */ + if (pdata->ecc_opt != OMAP_ECC_HAMMING_CODE_DIFF_LAYOUT) { + offset = (info->nand.options & NAND_BUSWIDTH_16) ? 2 : 1; + if (info->mtd.oobsize == 16) { + info->nand.badblock_pattern = &bb_descrip_flashbased; + omap_oobinfo.eccbytes = 3; + } else + omap_oobinfo.eccbytes = 3 * 4; + + for (i = 0; i < omap_oobinfo.eccbytes; i++) + omap_oobinfo.eccpos[i] = i+offset; + + omap_oobinfo.oobfree->offset = offset + omap_oobinfo.eccbytes; + omap_oobinfo.oobfree->length = info->mtd.oobsize - + (offset + omap_oobinfo.eccbytes); + + info->nand.ecc.layout = &omap_oobinfo; + } + #ifdef CONFIG_MTD_PARTITIONS err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0); if (err > 0)
--
1.7.0.4