src/soc/intel/xeon_sp/ddr.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <soc/ddr.h>
   4
   5 uint32_t get_ddr_voltage(uint8_t ddr_voltage)
   6 {
   7         /* SPD Byte 11: Module Nominal Voltage, currently DDR4 only supports 1.2V.
   8            Either Bit 0 or Bit 1 is set, return 1.2V */
   9         if (ddr_voltage & 0x3)
  10                 return 1200;
  11         return 0;
  12 }
  13
  14 unsigned int get_ddr_millivolt(unsigned int ddr_voltage)
  15 {
  16         switch (ddr_voltage) {
  17         case SPD_VDD_DDR4:
  18                 return 1200;
  19         case SPD_VDD_DDR5:
  20                 return 1100;
  21         default:
  22                 return 0;
  23         }
  24 }
  25
  26 unsigned int get_max_memory_speed(unsigned int common_tck)
  27 {
  28         if (common_tck <= DDR_8400_TCK_MIN)
  29                 return 8400;
  30         else if (common_tck <= DDR_7600_TCK_MIN)
  31                 return 7600;
  32         else if (common_tck <= DDR_7200_TCK_MIN)
  33                 return 7200;
  34         else if (common_tck <= DDR_6800_TCK_MIN)
  35                 return 6800;
  36         else if (common_tck <= DDR_6400_TCK_MIN)
  37                 return 6400;
  38         else if (common_tck <= DDR_6000_TCK_MIN)
  39                 return 6000;
  40         else if (common_tck <= DDR_5600_TCK_MIN)
  41                 return 5600;
  42         else if (common_tck <= DDR_5200_TCK_MIN)
  43                 return 5200;
  44         else if (common_tck <= DDR_4800_TCK_MIN)
  45                 return 4800;
  46         else if (common_tck <= DDR_4400_TCK_MIN)
  47                 return 4400;
  48         else if (common_tck <= DDR_4266_TCK_MIN)
  49                 return 4266;
  50         else if (common_tck <= DDR_4200_TCK_MIN)
  51                 return 4200;
  52         else if (common_tck <= DDR_4000_TCK_MIN)
  53                 return 4000;
  54         else if (common_tck <= DDR_3800_TCK_MIN)
  55                 return 3800;
  56         else if (common_tck <= DDR_3733_TCK_MIN)
  57                 return 3733;
  58         else if (common_tck <= DDR_3600_TCK_MIN)
  59                 return 3600;
  60         else if (common_tck <= DDR_3466_TCK_MIN)
  61                 return 3466;
  62         else if (common_tck <= DDR_3400_TCK_MIN)
  63                 return 3400;
  64         else if (common_tck <= DDR_3200_TCK_MIN)
  65                 return 3200;
  66         else if (common_tck <= DDR_3000_TCK_MIN)
  67                 return 3000;
  68         else if (common_tck <= DDR_2933_TCK_MIN)
  69                 return 2933;
  70         else if (common_tck <= DDR_2800_TCK_MIN)
  71                 return 2800;
  72         else if (common_tck <= DDR_2666_TCK_MIN)
  73                 return 2666;
  74         else if (common_tck <= DDR_2600_TCK_MIN)
  75                 return 2600;
  76         else if (common_tck <= DDR_2400_TCK_MIN)
  77                 return 2400;
  78         else if (common_tck <= DDR_2200_TCK_MIN)
  79                 return 2200;
  80         else if (common_tck <= DDR_2133_TCK_MIN)
  81                 return 2133;
  82         else if (common_tck <= DDR_2000_TCK_MIN)
  83                 return 2000;
  84         else if (common_tck <= DDR_1866_TCK_MIN)
  85                 return 1866;
  86         else if (common_tck <= DDR_1800_TCK_MIN)
  87                 return 1800;
  88         else if (common_tck <= DDR_1600_TCK_MIN)
  89                 return 1600;
  90         else if (common_tck <= DDR_1400_TCK_MIN)
  91                 return 1400;
  92         else if (common_tck <= DDR_1333_TCK_MIN)
  93                 return 1333;
  94         else if (common_tck <= DDR_1200_TCK_MIN)
  95                 return 1200;
  96         else if (common_tck <= DDR_1066_TCK_MIN)
  97                 return 1066;
  98         else if (common_tck <= DDR_1000_TCK_MIN)
  99                 return 1000;
 100         else
 101                 return 800;
 102 }
 103
 104 __weak bool mainboard_dimm_slot_exists(uint8_t socket, uint8_t channel, uint8_t slot)
 105 {
 106         return false;
 107 }