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kirkwood: implement kw_sdram_bs_set()

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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@keymile.com>
Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Marek Vasut <marex@denx.de>
Acked-by: Prafulla Wadaskar <Prafulla@marvell.com>
This commit is contained in:
Gerlando Falauto 2012-07-20 02:34:25 +00:00 committed by Prafulla Wadaskar
parent cf37c5d98b
commit 4551516525
1 changed files with 24 additions and 0 deletions
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24
arch/arm/cpu/arm926ejs/kirkwood/dram.c
View file

@ -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
*/
@ -56,6 +61,25 @@ u32 kw_sdram_bar(enum memory_bank bank)
return result;
}
/*
* 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
*/