src/mainboard/google/cyan/variants/celes/spd_util.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <gpio.h>
   5 #include <mainboard/google/cyan/spd/spd_util.h>
   6
   7 /*
   8  * Usage of RAMID straps
   9  *
  10  *  RAMID1 - Single/Dual channel configuration
  11  *   0 - Dual channel, 1 - Single channel
  12  *
  13  *  Combination of RAMID3, RAMID2, RAMID0 - Index of SPD table
  14  *   Index 0 - Samsung K4E8E304EE-EGCE 1600MHz 23nm
  15  *   Index 1 - Samsung K4E8E324EB-EGCF 1866MHz 20nm
  16  */
  17
  18 uint8_t get_ramid(void)
  19 {
  20         gpio_t spd_gpios[] = {
  21                 GP_SW_80,       /* SATA_GP3,RAMID0 */
  22                 GP_SE_02,       /* MF_PLT_CLK1, RAMID2 */
  23                 GP_SW_64,       /* I2C3_SDA RAMID3 */
  24                 GP_SW_67,       /* I2C3_SCL,RAMID1 */
  25         };
  26
  27         return gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
  28 }
  29
  30 int get_variant_spd_index(int ram_id, int *dual)
  31 {
  32         int spd_index = ram_id & 0x7;
  33
  34         /* Determine if single or dual channel memory system */
  35         /* RAMID3 is deterministic for celes */
  36         *dual = ((ram_id >> 3) & 0x1) ? 0 : 1;
  37
  38         /* Display the RAM type */
  39         printk(BIOS_DEBUG, *dual ? "4GiB " : "2GiB ");
  40         switch (spd_index) {
  41         case 0:
  42                 printk(BIOS_DEBUG, "Samsung K4E8E304EE-EGCE\n");
  43                 break;
  44         case 1:
  45                 printk(BIOS_DEBUG, "Samsung K4E8E324EB-EGCF\n");
  46                 break;
  47         }
  48
  49         return spd_index;
  50 }