[U-Boot] [PATCH 1/5] mtd/nand: Add function board_nand_init_tail() for some special NAND controllers

[Marek Vasut]

> In some NAND controllers there is a size limitation of RAM buffer(2K
> bytes). To support large-page NAND chips with greater than 2K pagesize, we
> need a large buffer, but we don't know pagesize before calling
> nand_scan_ident(), for more flexible and to identify different cases of
> large-page greater than 2K bytes, we have a board_nand_init_tail() between
> nand_scan_ident() and nand_scan_tail().
> 
> Signed-off-by: Shengzhou Liu <Shengzhou.Liu at freescale.com>
> ---
>  drivers/mtd/nand/nand.c |   19 ++++++++++++++++++-
>  1 files changed, 18 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mtd/nand/nand.c b/drivers/mtd/nand/nand.c
> index d987f4c..800541e 100644
> --- a/drivers/mtd/nand/nand.c
> +++ b/drivers/mtd/nand/nand.c
> @@ -39,6 +39,14 @@ static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] =
> CONFIG_SYS_NAND_BASE_LIS static const char default_nand_name[] = "nand";
>  static __attribute__((unused)) char
> dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
> 
> +int __board_nand_init_tail(struct mtd_info *mtd, struct nand_chip *nand)
> +{

Isn't struct nand_chip * already passed in mtd->priv ?

M

> +	/* Allow for init at tail in controller-specific file for some reason */
> +	return 0;
> +}
> +int board_nand_init_tail(struct mtd_info *mtd, struct nand_chip *nand)
> +__attribute__((weak, alias("__board_nand_init_tail")));
> +
>  static void nand_init_chip(struct mtd_info *mtd, struct nand_chip *nand,
>  			   ulong base_addr)
>  {
> @@ -51,7 +59,16 @@ static void nand_init_chip(struct mtd_info *mtd, struct
> nand_chip *nand,
> 
>  	nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
>  	if (board_nand_init(nand) == 0) {
> -		if (nand_scan(mtd, maxchips) == 0) {
> +		if (!nand_scan_ident(mtd, maxchips, NULL)) {
> +			if (board_nand_init_tail(mtd, nand)) {
> +				mtd->name = NULL;
> +				return;
> +			}
> +
> +			if (nand_scan_tail(mtd)) {
> +				mtd->name = NULL;
> +				return;
> +			}
>  			if (!mtd->name)
>  				mtd->name = (char *)default_nand_name;
>  #ifdef CONFIG_NEEDS_MANUAL_RELOC