spd_util.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <gpio.h>
#include <soc/gpio.h>
#include <mainboard/google/cyan/spd/spd_util.h>
 
/*
 * Usage of RAMID straps
 *
 *  RAMID1 - Single/Dual channel configuration
 *   0 - Dual channel, 1 - Single channel
 *
 *  Combination of RAMID3, RAMID2, RAMID0 - Index of SPD table
 *   Index 0 - Samsung K4E8E304EE-EGCE 1600MHz 23nm
 *   Index 1 - Samsung K4E8E324EB-EGCF 1866MHz 20nm
 */
 
uint8_t get_ramid(void)
{
        gpio_t spd_gpios[] = {
                GP_SW_80,       /* SATA_GP3,RAMID0 */
                GP_SE_02,       /* MF_PLT_CLK1, RAMID2 */
                GP_SW_64,       /* I2C3_SDA RAMID3 */
                GP_SW_67,       /* I2C3_SCL,RAMID1 */
        };
 
        return gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
}
 
int get_variant_spd_index(int ram_id, int *dual)
{
        int spd_index = ram_id & 0x7;
 
        /* Determine if single or dual channel memory system */
        /* RAMID3 is deterministic for celes */
        *dual = ((ram_id >> 3) & 0x1) ? 0 : 1;
 
        /* Display the RAM type */
        printk(BIOS_DEBUG, *dual ? "4GiB " : "2GiB ");
        switch (spd_index) {
        case 0:
                printk(BIOS_DEBUG, "Samsung K4E8E304EE-EGCE\n");
                break;
        case 1:
                printk(BIOS_DEBUG, "Samsung K4E8E324EB-EGCF\n");
                break;
        }
 
        return spd_index;
}