[U-Boot] [PATCH v3 2/4] kirkwood: implement kw_sdram_bs_set()

[Prafulla Wadaskar]

> -----Original Message-----
> From: Holger Brunck [mailto:holger.brunck at keymile.com]
> Sent: 20 July 2012 18:04
> To: u-boot at lists.denx.de
> Cc: Gerlando Falauto; Holger Brunck; Prafulla Wadaskar; Valentin
> Longchamp; Marek Vasut
> Subject: [PATCH v3 2/4] kirkwood: implement kw_sdram_bs_set()
> 
> From: Gerlando Falauto <gerlando.falauto at keymile.com>
> 
> Some boards might be equipped with different SDRAM configurations.
> When that is the case, CPU CS Window Size Register (CS[0]n Size)
> should be set to the biggest value through board.cfg file; then its
> value can be fixed at runtime according to the detected SDRAM size.
> 
> Therefore, implement kw_sdram_bs_set().
> 
> Signed-off-by: Gerlando Falauto <gerlando.falauto at keymile.com>
> Signed-off-by: Holger Brunck <holger.brunck at keymile.com>
> cc: Prafulla Wadaskar <prafulla at marvell.com>
> cc: Valentin Longchamp <valentin.longchamp at keymile.com>
> cc: Marek Vasut <marex at denx.de>
> ---
> changes for v3:
>   - remove reviewed by, because there are some chages in
>   - use c-struct instead of defines
>   - make kw_sdram_bs_set static
> changes for v2:
>   - added Reviewed-by: Marek Vasut <marex at denx.de>
> 
>  arch/arm/cpu/arm926ejs/kirkwood/dram.c |   24
> ++++++++++++++++++++++++
>  1 files changed, 24 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/cpu/arm926ejs/kirkwood/dram.c
> b/arch/arm/cpu/arm926ejs/kirkwood/dram.c
> index 1c5faab..5e2f9d8 100644
> --- a/arch/arm/cpu/arm926ejs/kirkwood/dram.c
> +++ b/arch/arm/cpu/arm926ejs/kirkwood/dram.c
> @@ -39,6 +39,11 @@ struct kw_sdram_addr_dec {
>  	struct kw_sdram_bank	sdram_bank[4];
>  };
> 
> +#define KW_REG_CPUCS_WIN_ENABLE		(1 << 0)
> +#define KW_REG_CPUCS_WIN_WR_PROTECT	(1 << 1)
> +#define KW_REG_CPUCS_WIN_WIN0_CS(x)	(((x) & 0x3) << 2)
> +#define KW_REG_CPUCS_WIN_SIZE(x)	(((x) & 0xff) << 24)
> +
>  /*
>   * kw_sdram_bar - reads SDRAM Base Address Register
>   */
> @@ -57,6 +62,25 @@ u32 kw_sdram_bar(enum memory_bank bank)
>  }
> 
>  /*
> + * kw_sdram_bs_set - writes SDRAM Bank size
> + */
> +static void kw_sdram_bs_set(enum memory_bank bank, u32 size)
> +{
> +	struct kw_sdram_addr_dec *base =
> +		(struct kw_sdram_addr_dec *)KW_REGISTER(0x1500);
> +	/* Read current register value */
> +	u32 reg = readl(&base->sdram_bank[bank].win_sz);
> +
> +	/* Clear window size */
> +	reg &= ~KW_REG_CPUCS_WIN_SIZE(0xFF);
> +
> +	/* Set new window size */
> +	reg |= KW_REG_CPUCS_WIN_SIZE((size - 1) >> 24);
> +
> +	writel(reg, &base->sdram_bank[bank].win_sz);
> +}
> +
> +/*
>   * kw_sdram_bs - reads SDRAM Bank size
>   */
>  u32 kw_sdram_bs(enum memory_bank bank)
> --

Acked-by: Prafulla Wadaskar <Prafulla at marvell.com>

Regards...
Prafulla . . .