On Tue, Aug 19, 2014 at 03:31:54PM +0300, Ivan Khoronzhuk wrote:
> From: Sandeep Paulraj <s-paul...@ti.com>
>
> It is needed for k2l keystone2 EVM which uses NAND flash with 4K page
> size, hence add support for 4K page size nand devices.
>
> Signed-off-by: Sandeep Paulraj <s-paul...@ti.com>
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronz...@ti.com>
> ---
>
> Based on l2-mtd/master
>
> v1..v2:
> - fixed comment style, no functional changes
This was resurrected Murali Karicheri. Since this one is nearly
identical and much preceded it, I've pushed it to l2-mtd.git.
Thanks,
Brian
> drivers/mtd/nand/davinci_nand.c | 42
> ++++++++++++++++++++++++++++++-----------
> 1 file changed, 31 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
> index b922c8e..d7df32c 100644
> --- a/drivers/mtd/nand/davinci_nand.c
> +++ b/drivers/mtd/nand/davinci_nand.c
> @@ -520,6 +520,32 @@ static struct nand_ecclayout hwecc4_2048 = {
> },
> };
>
> +/*
> + * An ECC layout for using 4-bit ECC with large-page (4096bytes) flash,
> + * storing ten ECC bytes plus the manufacturer's bad block marker byte,
> + * and not overlapping the default BBT markers.
> + */
> +static struct nand_ecclayout hwecc4_4096 = {
> + .eccbytes = 80,
> + .eccpos = {
> + /* at the end of spare sector */
> + 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
> + 58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
> + 68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
> + 78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
> + 88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
> + 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
> + 108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
> + 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
> + },
> + .oobfree = {
> + /* 2 bytes at offset 0 hold manufacturer badblock markers */
> + {.offset = 2, .length = 46, },
> + /* 5 bytes at offset 8 hold BBT markers */
> + /* 8 bytes at offset 16 hold JFFS2 clean markers */
> + },
> +};
> +
> #if defined(CONFIG_OF)
> static const struct of_device_id davinci_nand_of_match[] = {
> {.compatible = "ti,davinci-nand", },
> @@ -796,18 +822,12 @@ static int nand_davinci_probe(struct platform_device
> *pdev)
> info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
> goto syndrome_done;
> }
> + if (chunks == 8) {
> + info->ecclayout = hwecc4_4096;
> + info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
> + goto syndrome_done;
> + }
>
> - /* 4KiB page chips are not yet supported. The eccpos from
> - * nand_ecclayout cannot hold 80 bytes and change to eccpos[]
> - * breaks userspace ioctl interface with mtd-utils. Once we
> - * resolve this issue, NAND_ECC_HW_OOB_FIRST mode can be used
> - * for the 4KiB page chips.
> - *
> - * TODO: Note that nand_ecclayout has now been expanded and can
> - * hold plenty of OOB entries.
> - */
> - dev_warn(&pdev->dev, "no 4-bit ECC support yet "
> - "for 4KiB-page NAND\n");
> ret = -EIO;
> goto err;
>
> --
> 1.8.3.2
>
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