[U-Boot] [PATCH] mtd: nand: omap_gpmc: Make ready/busy pins configurable

[Stefan Roese]

On 10.02.2015 14:21, Michal Sojka wrote:
> Commit fb384c4720ca7496775d6578f184bf628db73456 introduced the use of
> WAIT0 pin for determining whether the NAND is ready or not. This only
> works if all NAND chips are connected to WAIT0. If some chips are
> connected to the other available pin WAIT1, nand_wait() does not really
> wait and prints a WARN_ON message.
>
> This patch allows the board to provide configuration of which chip is
> connected to which WAITx signal. For example, one can define in
> include/configs/foo.h:
>
>      #define CONFIG_NAND_OMAP_GPMC_WSCFG     0,0,1,1
>
> This would mean that chips using to CS0 and 1 are connected to WAIT0 and
> chips with CS2 and 3 are connected to WAIT1.
>
> Signed-off-by: Michal Sojka <sojka at merica.cz>
>
> Cc: Tom Rini <trini at ti.com>
> Cc: Stefan Roese <sr at denx.de>
> ---
>   drivers/mtd/nand/omap_gpmc.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
> index 459904d..57fc7b9 100644
> --- a/drivers/mtd/nand/omap_gpmc.c
> +++ b/drivers/mtd/nand/omap_gpmc.c
> @@ -36,7 +36,8 @@ static __maybe_unused struct nand_ecclayout omap_ecclayout;
>   struct omap_nand_info {
>   	struct bch_control *control;
>   	enum omap_ecc ecc_scheme;
> -	int cs;
> +	uint8_t cs;
> +	uint8_t ws;		/* wait status pin (0,1) */
>   };
>
>   /* We are wasting a bit of memory but al least we are safe */
> @@ -76,7 +77,9 @@ static void omap_nand_hwcontrol(struct mtd_info *mtd, int32_t cmd,
>   /* Check wait pin as dev ready indicator */
>   static int omap_dev_ready(struct mtd_info *mtd)
>   {
> -	return gpmc_cfg->status & (1 << 8);
> +	register struct nand_chip *this = mtd->priv;
> +	struct omap_nand_info *info = this->priv;
> +	return gpmc_cfg->status & (1 << (8 + info->ws));
>   }
>
>   /*
> @@ -853,6 +856,12 @@ int board_nand_init(struct nand_chip *nand)
>   	nand->IO_ADDR_W = (void __iomem *)&gpmc_cfg->cs[cs].nand_cmd;
>   	omap_nand_info[cs].control = NULL;
>   	omap_nand_info[cs].cs = cs;
> +#if !defined(CONFIG_NAND_OMAP_GPMC_WSCFG)
> +	omap_nand_info[cs].ws = 0;
> +#else
> +	int8_t ws[CONFIG_SYS_MAX_NAND_DEVICE] = { CONFIG_NAND_OMAP_GPMC_WSCFG };

Doesn't this declaration trigger a compilation warning?

> +	omap_nand_info[cs].ws = ws[cs];
> +#endif

I've attached a new version of this patch. It removed the ifdef from the 
code. Please take a look at it and let me know what you think.

Thanks,
Stefan

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