From: Gerlando Falauto <gerlando.fala...@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.fala...@keymile.com>
Signed-off-by: Holger Brunck <holger.bru...@keymile.com>
cc: Prafulla Wadaskar <prafu...@marvell.com>
cc: Valentin Longchamp <valentin.longch...@keymile.com>
cc: Marek Vasut <ma...@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 <ma...@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)
--
1.7.1
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