[U-Boot] [PATCH v4 3/4] kirkwood: implement kw_sdram_size_adjust

[Gerlando Falauto]

Size of the SDRAM chips might differ between any two (otherwise
identical) instances of the same board.

So add a function kw_sdram_size_adjust() which reads out the current
ram size for a given bank, and adjusts the Kirkwood's SDRAM window size
register accordingly.

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>
---
changes for v4:
  - add bank parameter to kw_sdram_size_adjust()
 
changes for v3: 
  - rename dram_size_fixup to kw_sdramsize_adjust and move them to kirkwood/dram.c
  
changes for v2:
  - rebase to current u-boot-marvell.git master branch

 arch/arm/cpu/arm926ejs/kirkwood/dram.c   |   11 +++++++++++
 arch/arm/include/asm/arch-kirkwood/cpu.h |    1 +
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/kirkwood/dram.c b/arch/arm/cpu/arm926ejs/kirkwood/dram.c
index 5e2f9d8..807894f 100644
--- a/arch/arm/cpu/arm926ejs/kirkwood/dram.c
+++ b/arch/arm/cpu/arm926ejs/kirkwood/dram.c
@@ -97,6 +97,17 @@ u32 kw_sdram_bs(enum memory_bank bank)
 	return result;
 }
 
+void kw_sdram_size_adjust(enum memory_bank bank)
+{
+	u32 size;
+
+	/* probe currently equipped RAM size */
+	size = get_ram_size((void *)kw_sdram_bar(bank), kw_sdram_bs(bank));
+
+	/* adjust SDRAM window size accordingly */
+	kw_sdram_bs_set(bank, size);
+}
+
 #ifndef CONFIG_SYS_BOARD_DRAM_INIT
 int dram_init(void)
 {
diff --git a/arch/arm/include/asm/arch-kirkwood/cpu.h b/arch/arm/include/asm/arch-kirkwood/cpu.h
index d28c51a..23783d5 100644
--- a/arch/arm/include/asm/arch-kirkwood/cpu.h
+++ b/arch/arm/include/asm/arch-kirkwood/cpu.h
@@ -159,6 +159,7 @@ void reset_cpu(unsigned long ignored);
 unsigned char get_random_hex(void);
 unsigned int kw_sdram_bar(enum memory_bank bank);
 unsigned int kw_sdram_bs(enum memory_bank bank);
+void kw_sdram_size_adjust(enum memory_bank bank);
 int kw_config_adr_windows(void);
 void kw_config_gpio(unsigned int gpp0_oe_val, unsigned int gpp1_oe_val,
 		unsigned int gpp0_oe, unsigned int gpp1_oe);
-- 
1.7.1