> Freescale FCM controller has a 2K size limitation of buffer RAM. In order
> to support the Nand flash chip whose page size is larger than 2K bytes,
> we read/write 2k data repeatedly by issuing FIR_OP_RB/FIR_OP_WB and save
> them to a large buffer.
>
> Signed-off-by: Shengzhou Liu <shengzhou....@freescale.com>
> Signed-off-by: Liu Shuo <b35...@freescale.com>
> ---
> drivers/mtd/nand/fsl_elbc_nand.c | 279
> +++++++++++++++++++++++++++++++++---- 1 files changed, 248 insertions(+),
> 31 deletions(-)
>
> diff --git a/drivers/mtd/nand/fsl_elbc_nand.c
> b/drivers/mtd/nand/fsl_elbc_nand.c index 52362b1..3983c8c 100644
> --- a/drivers/mtd/nand/fsl_elbc_nand.c
> +++ b/drivers/mtd/nand/fsl_elbc_nand.c
> @@ -64,7 +64,6 @@ struct fsl_elbc_mtd {
> struct device *dev;
> int bank; /* Chip select bank number */
> u8 __iomem *vbase; /* Chip select base virtual address */
> - int page_size; /* NAND page size (0=512, 1=2048) */
> unsigned int fmr; /* FCM Flash Mode Register value */
> };
>
> @@ -85,6 +84,8 @@ struct fsl_elbc_ctrl {
> unsigned int mdr; /* UPM/FCM Data Register value */
> unsigned int use_mdr; /* Non zero if the MDR is to be set */
> unsigned int oob; /* Non zero if operating on OOB data */
> + char *buffer; /* just used when pagesize is greater */
Start sentence with capital letter
> + /* than FCM RAM 2K limitation */
> };
>
> /* These map to the positions used by the FCM hardware ECC generator */
> @@ -159,6 +160,44 @@ static struct nand_bbt_descr bbt_mirror_descr = {
> .pattern = mirror_pattern,
> };
>
> +static void io_to_buffer(struct mtd_info *mtd, int subpage, int oob)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct fsl_elbc_mtd *priv = chip->priv;
> + struct fsl_elbc_ctrl *ctrl = priv->ctrl;
> + void *src, *dst;
> + int len = (oob ? 64 : 2048);
No parenthesis ...
> +
> + /* for emulating 4096+ bytes NAND using 2048-byte FCM RAM */
> + if (oob)
> + dst = ctrl->buffer + mtd->writesize + subpage * 64;
> + else
> + dst = ctrl->buffer + subpage * 2048;
subpage * len ?
> +
> + src = ctrl->addr + (oob ? 2048 : 0);
> + memcpy_fromio(dst, src, len);
> +}
> +
> +static void buffer_to_io(struct mtd_info *mtd, int subpage, int oob)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct fsl_elbc_mtd *priv = chip->priv;
> + struct fsl_elbc_ctrl *ctrl = priv->ctrl;
> + void *src, *dst;
> + int len = (oob ? 64 : 2048);
> +
> + if (oob)
> + src = ctrl->buffer + mtd->writesize + subpage * 64;
> + else
> + src = ctrl->buffer + subpage * 2048;
DTTO
M
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