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[U-Boot,6/6] Exynos5: ddr3: Choose between single or double channel config

Message ID 1412755862-16294-9-git-send-email-akshay.s@samsung.com
State Changes Requested
Delegated to: Minkyu Kang
Headers show

Commit Message

Akshay Saraswat Oct. 8, 2014, 8:11 a.m. UTC 
Add a 4G configuration and choose it based on the number of banks
declared in config file. A board with 4 SDRAM banks declared (as
per CONFIG_NR_DRAM_BANKS) will end up with the 2G confiuration.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
---
 arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c b/arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c
index 4d73b45..7c0b12a 100644
--- a/arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c
+++ b/arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c
@@ -464,6 +464,16 @@  int ddr3_mem_ctrl_init(struct mem_timings *mem, int reset)
 							+ DMC_OFFSET);
 	pmu = (struct exynos5_power *)EXYNOS5420_POWER_BASE;
 
+	if (CONFIG_NR_DRAM_BANKS > 4) {
+		/* Need both controllers. */
+		mem->memcontrol |= DMC_MEMCONTROL_NUM_CHIP_2;
+		mem->chips_per_channel = 2;
+		mem->chips_to_configure = 2;
+	} else {
+		/* 2GB requires a single controller */
+		mem->memcontrol |= DMC_MEMCONTROL_NUM_CHIP_1;
+	}
+
 	/* Enable PAUSE for DREX */
 	setbits_le32(&clk->pause, ENABLE_BIT);