[U-Boot] [PATCH 4/4] mtd/nand: Add ONFI support for FSL NAND controller

[Scott Wood <scottwood@freescale.com>]

On 12/02/2011 03:17 AM, Shengzhou Liu wrote:
> - fix NAND_CMD_READID command for ONFI detect.
>  - add NAND_CMD_PARAM command to read the ONFI parameter page.
> 
> Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
> ---
>  drivers/mtd/nand/fsl_elbc_nand.c |   16 +++++++++++++++-
>  1 files changed, 15 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
> index 4d1e527..476fdd3 100644
> --- a/drivers/mtd/nand/fsl_elbc_nand.c
> +++ b/drivers/mtd/nand/fsl_elbc_nand.c
> @@ -350,7 +350,7 @@ static void fsl_elbc_cmdfunc(struct mtd_info *mtd, unsigned int command,
>  		out_be32(&lbc->fbcr, 5);
>  		ctrl->read_bytes = 5;
>  		ctrl->use_mdr = 1;
> -		ctrl->mdr = 0;
> +		ctrl->mdr = column;
>  
>  		set_addr(mtd, 0, 0, 0);
>  		fsl_elbc_run_command(mtd);
> @@ -480,6 +480,20 @@ static void fsl_elbc_cmdfunc(struct mtd_info *mtd, unsigned int command,
>  		fsl_elbc_run_command(mtd);
>  		return;
>  
> +	case NAND_CMD_PARAM:
> +		dbg("fsl_elbc_cmdfunc: NAND_CMD_PARAM.\n");
> +		out_be32(&lbc->fir, (FIR_OP_CM0 << FIR_OP0_SHIFT) |
> +				    (FIR_OP_UA  << FIR_OP1_SHIFT) |
> +				    (FIR_OP_RBW << FIR_OP2_SHIFT));
> +		out_be32(&lbc->fcr, NAND_CMD_PARAM << FCR_CMD0_SHIFT);
> +		out_be32(&lbc->fbcr, 256);
> +		ctrl->read_bytes = 256;
> +		ctrl->use_mdr = 1;
> +		ctrl->mdr = column;
> +		set_addr(mtd, 0, 0, 0);
> +		fsl_elbc_run_command(mtd);
> +		return;

This could share code with NAND_CMD_READID -- always read 256 bytes
(we'll need to read more than 5 bytes for non-ONFI as well, when we pull
in the newer Linux NAND code), and use "command << FCR_CMD0_SHIFT" for FCR.

BTW, has anyone tested the eLBC driver with 16-bit NAND?  I think our
read_byte() implementation is not going to do the right thing here -- it
needs to read a 16-bit word when the chip is 16-bit, and discard the
upper half.

-Scott