ddr.c

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/* 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;
}