[PATCH] nand_imx: fix read ONFI param on NFC v21

[Sascha Hauer]

On Wed, Dec 11, 2013 at 07:24:27PM +0100, Eric Bénard wrote:
> tested on an i.MX25 where we now get :
> nand: ONFI param page 0 valid
> nand: ONFI flash detected
> nand: NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron MT29F2G08ABAEAWP), 256MiB, page size: 2048, OOB size: 64
> 
> Signed-off-by: Eric Bénard <eric at eukrea.com>

Applied, thanks

Sascha

> ---
>  drivers/mtd/nand/nand_imx.c | 25 +++++++++----------------
>  1 file changed, 9 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/mtd/nand/nand_imx.c b/drivers/mtd/nand/nand_imx.c
> index 965b41e..fd57b4d 100644
> --- a/drivers/mtd/nand/nand_imx.c
> +++ b/drivers/mtd/nand/nand_imx.c
> @@ -403,12 +403,15 @@ static void send_read_id_v1_v2(struct imx_nand_host *host)
>  	memcpy32(host->data_buf, host->main_area0, 16);
>  }
>  
> -/* FIXME : to check on real HW */
>  static void send_read_param_v1_v2(struct imx_nand_host *host)
>  {
>  	struct nand_chip *this = &host->nand;
> +	u32 backup = readw(host->regs + NFC_V1_V2_CONFIG1);
>  
> -	/* NANDFC buffer 0 is used for device ID output */
> +	/* Temporary disable ECC to be able to read param page */
> +	writew(backup & ~NFC_V1_V2_CONFIG1_ECC_EN, host->regs + NFC_V1_V2_CONFIG1);
> +
> +	/* NANDFC buffer 0 is used for param output */
>  	writew(0x0, host->regs + NFC_V1_V2_BUF_ADDR);
>  
>  	writew(NFC_OUTPUT, host->regs + NFC_V1_V2_CONFIG2);
> @@ -416,20 +419,10 @@ static void send_read_param_v1_v2(struct imx_nand_host *host)
>  	/* Wait for operation to complete */
>  	wait_op_done(host);
>  
> -	if (this->options & NAND_BUSWIDTH_16) {
> -		volatile u16 *mainbuf = host->main_area0;
> -
> -		/*
> -		 * Pack the every-other-byte result for 16-bit ID reads
> -		 * into every-byte as the generic code expects and various
> -		 * chips implement.
> -		 */
> -
> -		mainbuf[0] = (mainbuf[0] & 0xff) | ((mainbuf[1] & 0xff) << 8);
> -		mainbuf[1] = (mainbuf[2] & 0xff) | ((mainbuf[3] & 0xff) << 8);
> -		mainbuf[2] = (mainbuf[4] & 0xff) | ((mainbuf[5] & 0xff) << 8);
> -	}
>  	memcpy32(host->data_buf, host->main_area0, 1024);
> +
> +	/* Restore original CONFIG1 value */
> +	writew(backup, host->regs + NFC_V1_V2_CONFIG1);
>  }
>  /*
>   * This function requests the NANDFC to perform a read of the
> @@ -1147,7 +1140,7 @@ static int __init imxnd_probe(struct device_d *dev)
>  		host->send_addr = send_addr_v1_v2;
>  		host->send_page = send_page_v1_v2;
>  		host->send_read_id = send_read_id_v1_v2;
> -		host->send_read_param = send_read_param_v1_v2; /* FIXME : to check */
> +		host->send_read_param = send_read_param_v1_v2;
>  		host->get_dev_status = get_dev_status_v1_v2;
>  		host->check_int = check_int_v1_v2;
>  	}
> -- 
> 1.8.3.1
> 
> 
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