1 files changed, 84 insertions, 0 deletions
diff --git a/src/soc/intel/xeon_sp/cpx/ddr.c b/src/soc/intel/xeon_sp/cpx/ddr.c
new file mode 100644
index 0000000000..0fa36ab6c9
--- /dev/null
+++ b/src/soc/intel/xeon_sp/cpx/ddr.c
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <soc/ddr.h>
+
+uint32_t get_ddr_voltage(uint8_t DdrVoltage)
+{
+	/* SPD Byte 11: Module Nominal Voltage, currently DDR4 only supports 1.2V.
+	   Either Bit 0 or Bit 1 is set, return 1.2V */
+	if (DdrVoltage & 0x3)
+		return 1200;
+	return 0;
+}
+
+uint16_t get_max_memory_speed(uint32_t commonTck)
+{
+	if (commonTck <= DDR_8400_TCK_MIN)
+		return 8400;
+	else if (commonTck <= DDR_6400_TCK_MIN)
+		return 6400;
+	else if (commonTck <= DDR_6000_TCK_MIN)
+		return 6000;
+	else if (commonTck <= DDR_5600_TCK_MIN)
+		return 5600;
+	else if (commonTck <= DDR_5200_TCK_MIN)
+		return 5200;
+	else if (commonTck <= DDR_4800_TCK_MIN)
+		return 4800;
+	else if (commonTck <= DDR_4400_TCK_MIN)
+		return 4400;
+	else if (commonTck <= DDR_4266_TCK_MIN)
+		return 4266;
+	else if (commonTck <= DDR_4200_TCK_MIN)
+		return 4200;
+	else if (commonTck <= DDR_4000_TCK_MIN)
+		return 4000;
+	else if (commonTck <= DDR_3800_TCK_MIN)
+		return 3800;
+	else if (commonTck <= DDR_3733_TCK_MIN)
+		return 3733;
+	else if (commonTck <= DDR_3600_TCK_MIN)
+		return 3600;
+	else if (commonTck <= DDR_3466_TCK_MIN)
+		return 3466;
+	else if (commonTck <= DDR_3400_TCK_MIN)
+		return 3400;
+	else if (commonTck <= DDR_3200_TCK_MIN)
+		return 3200;
+	else if (commonTck <= DDR_3000_TCK_MIN)
+		return 3000;
+	else if (commonTck <= DDR_2933_TCK_MIN)
+		return 2933;
+	else if (commonTck <= DDR_2800_TCK_MIN)
+		return 2800;
+	else if (commonTck <= DDR_2666_TCK_MIN)
+		return 2666;
+	else if (commonTck <= DDR_2600_TCK_MIN)
+		return 2600;
+	else if (commonTck <= DDR_2400_TCK_MIN)
+		return 2400;
+	else if (commonTck <= DDR_2200_TCK_MIN)
+		return 2200;
+	else if (commonTck <= DDR_2133_TCK_MIN)
+		return 2133;
+	else if (commonTck <= DDR_2000_TCK_MIN)
+		return 2000;
+	else if (commonTck <= DDR_1866_TCK_MIN)
+		return 1866;
+	else if (commonTck <= DDR_1800_TCK_MIN)
+		return 1800;
+	else if (commonTck <= DDR_1600_TCK_MIN)
+		return 1600;
+	else if (commonTck <= DDR_1400_TCK_MIN)
+		return 1400;
+	else if (commonTck <= DDR_1333_TCK_MIN)
+		return 1333;
+	else if (commonTck <= DDR_1200_TCK_MIN)
+		return 1200;
+	else if (commonTck <= DDR_1066_TCK_MIN)
+		return 1066;
+	else if (commonTck <= DDR_1000_TCK_MIN)
+		return 1000;
+	else
+		return 800;
+}