From 631407c5c03b8503b7f297452154d6100d95510b Mon Sep 17 00:00:00 2001 From: Joshua Scott Date: Mon, 4 Sep 2017 17:38:32 +1200 Subject: [PATCH] ARM: mvebu: add additional information to board_add_ram_info() Display more information about the current RAM configuration. With these changes the output on a 88F6820 board is SoC: MV88F6820-A0 at 1600 MHz DRAM: 2 GiB (800 MHz, 32-bit, ECC not enabled) Signed-off-by: Joshua Scott Signed-off-by: Chris Packham Reviewed-by: Stefan Roese Signed-off-by: Stefan Roese --- arch/arm/mach-mvebu/dram.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/arch/arm/mach-mvebu/dram.c b/arch/arm/mach-mvebu/dram.c index e3f304c..55e9ad7 100644 --- a/arch/arm/mach-mvebu/dram.c +++ b/arch/arm/mach-mvebu/dram.c @@ -216,6 +216,35 @@ static int ecc_enabled(void) return 0; } + +/* Return the width of the DRAM bus, or 0 for unknown. */ +static int bus_width(void) +{ + int full_width = 0; + + if (reg_read(REG_SDRAM_CONFIG_ADDR) & (1 << REG_SDRAM_CONFIG_WIDTH_OFFS)) + full_width = 1; + + switch (mvebu_soc_family()) { + case MVEBU_SOC_AXP: + return full_width ? 64 : 32; + break; + case MVEBU_SOC_A375: + case MVEBU_SOC_A38X: + case MVEBU_SOC_MSYS: + return full_width ? 32 : 16; + default: + return 0; + } +} + +static int cycle_mode(void) +{ + int val = reg_read(REG_DUNIT_CTRL_LOW_ADDR); + + return (val >> REG_DUNIT_CTRL_LOW_2T_OFFS) & REG_DUNIT_CTRL_LOW_2T_MASK; +} + #else static void dram_ecc_scrubbing(void) { @@ -295,10 +324,26 @@ int dram_init_banksize(void) void board_add_ram_info(int use_default) { struct sar_freq_modes sar_freq; + int mode; + int width; get_sar_freq(&sar_freq); printf(" (%d MHz, ", sar_freq.d_clk); + width = bus_width(); + if (width) + printf("%d-bit, ", width); + + mode = cycle_mode(); + /* Mode 0 = Single cycle + * Mode 1 = Two cycles (2T) + * Mode 2 = Three cycles (3T) + */ + if (mode == 1) + printf("2T, "); + if (mode == 2) + printf("3T, "); + if (ecc_enabled()) printf("ECC"); else -- 2.7.4