diff options
Diffstat (limited to 'arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c')
| -rw-r--r-- | arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c b/arch/arm/cpu/armv7/exynos/dmc_init_ddr3.c index b86dd2d650..7c0b12ae51 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); @@ -832,6 +842,25 @@ int ddr3_mem_ctrl_init(struct mem_timings *mem, int reset) setbits_le32(&drex0->cgcontrol, DMC_INTERNAL_CG); setbits_le32(&drex1->cgcontrol, DMC_INTERNAL_CG); + /* + * As per Exynos5800 UM ver 0.00 section 17.13.2.1 + * CONCONTROL register bit 3 [update_mode], Exynos5800 does not + * support the PHY initiated update. And it is recommended to set + * this field to 1'b1 during initialization + * + * When we apply PHY-initiated mode, DLL lock value is determined + * once at DMC init time and not updated later when we change the MIF + * voltage based on ASV group in kernel. Applying MC-initiated mode + * makes sure that DLL tracing is ON so that silicon is able to + * compensate the voltage variation. + */ + val = readl(&drex0->concontrol); + val |= CONCONTROL_UPDATE_MODE; + writel(val , &drex0->concontrol); + val = readl(&drex1->concontrol); + val |= CONCONTROL_UPDATE_MODE; + writel(val , &drex1->concontrol); + return 0; } #endif |
