linux-kernel - Re: [PATCH v4 3/6] mtd: rawnand: add defines for ONFI version bits

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Date:   Thu, 21 Jun 2018 13:05:54 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     miquel.raynal@...tlin.com, dwmw2@...radead.org,
        computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Marek Vasut <marek.vasut@...il.com>
Subject: Re: [PATCH v4 3/6] mtd: rawnand: add defines for ONFI version bits

On Thu, 21 Jun 2018 22:33:25 +1200
Chris Packham <chris.packham@...iedtelesis.co.nz> wrote:

> Add defines for the ONFI version bits and use them in
> nand_flash_detect_onfi().
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>

Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>

> ---
> Changes in v4:
> - New
> 
>  drivers/mtd/nand/raw/nand_base.c | 10 +++++-----
>  include/linux/mtd/rawnand.h      | 11 +++++++++++
>  2 files changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index 65250308c82d..36048e0cf1f5 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -5178,15 +5178,15 @@ static int nand_flash_detect_onfi(struct nand_chip *chip)
>  
>  	/* Check version */
>  	val = le16_to_cpu(p->revision);
> -	if (val & (1 << 5))
> +	if (val & ONFI_VERSION_2_3)
>  		chip->parameters.onfi.version = 23;
> -	else if (val & (1 << 4))
> +	else if (val & ONFI_VERSION_2_2)
>  		chip->parameters.onfi.version = 22;
> -	else if (val & (1 << 3))
> +	else if (val & ONFI_VERSION_2_1)
>  		chip->parameters.onfi.version = 21;
> -	else if (val & (1 << 2))
> +	else if (val & ONFI_VERSION_2_0)
>  		chip->parameters.onfi.version = 20;
> -	else if (val & (1 << 1))
> +	else if (val & ONFI_VERSION_1_0)
>  		chip->parameters.onfi.version = 10;
>  
>  	if (!chip->parameters.onfi.version) {
> diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> index ef7e3b4e91ea..015bc3f2fc13 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -230,6 +230,17 @@ enum nand_ecc_algo {
>  /* Keep gcc happy */
>  struct nand_chip;
>  
> +/* ONFI version bits */
> +#define ONFI_VERSION_1_0		BIT(1)
> +#define ONFI_VERSION_2_0		BIT(2)
> +#define ONFI_VERSION_2_1		BIT(3)
> +#define ONFI_VERSION_2_2		BIT(4)
> +#define ONFI_VERSION_2_3		BIT(5)
> +#define ONFI_VERSION_3_0		BIT(6)
> +#define ONFI_VERSION_3_1		BIT(7)
> +#define ONFI_VERSION_3_2		BIT(8)
> +#define ONFI_VERSION_4_0		BIT(9)
> +
>  /* ONFI features */
>  #define ONFI_FEATURE_16_BIT_BUS		(1 << 0)
>  #define ONFI_FEATURE_EXT_PARAM_PAGE	(1 << 7)