src/mainboard/google/poppy/variants/baseboard/memory.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <baseboard/variants.h>
#include <gpio.h>
#include <variant/gpio.h>

/* DQ byte map */
static const u8 dq_map[][12] = {
	{ 0x0F, 0xF0, 0x00, 0xF0, 0x0F, 0xF0,
	  0x0F, 0x00, 0xFF, 0x00, 0xFF, 0x00 },
	{ 0xCC, 0x33, 0x00, 0x33, 0xCC, 0x33,
	  0xCC, 0x00, 0xFF, 0x00, 0xFF, 0x00 }
};

/* DQS CPU<>DRAM map */
static const u8 dqs_map[][8] = {
	{ 2, 3, 1, 0, 4, 7, 6, 5 },
	{ 5, 6, 0, 3, 4, 7, 2, 1 },
};

/* Rcomp resistor */
static const u16 rcomp_resistor[] = { 200, 81, 162 };

/* Rcomp target */
static const u16 rcomp_target[] = { 100, 40, 40, 23, 40 };

void __weak variant_memory_params(struct memory_params *p)
{
	p->type = MEMORY_LPDDR3;
	p->dq_map = dq_map;
	p->dq_map_size = sizeof(dq_map);
	p->dqs_map = dqs_map;
	p->dqs_map_size = sizeof(dqs_map);
	p->rcomp_resistor = rcomp_resistor;
	p->rcomp_resistor_size = sizeof(rcomp_resistor);
	p->rcomp_target = rcomp_target;
	p->rcomp_target_size = sizeof(rcomp_target);
}

int __weak variant_memory_sku(void)
{
	gpio_t spd_gpios[] = {
		GPIO_MEM_CONFIG_0,
		GPIO_MEM_CONFIG_1,
		GPIO_MEM_CONFIG_2,
		GPIO_MEM_CONFIG_3,
	};

	return gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
}