src/mainboard/google/gru/sdram_configs.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2014 Google Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <arch/io.h>
#include <boardid.h>
#include <cbfs.h>
#include <console/console.h>
#include <gpio.h>
#include <soc/sdram.h>
#include <string.h>
#include <types.h>

static const char *sdram_configs[] = {
	[0] = "sdram-lpddr3-hynix-4GB",
	[3] = "sdram-lpddr3-samsung-2GB-24EB",
	[4] = "sdram-lpddr3-micron-2GB",
	[5] = "sdram-lpddr3-samsung-4GB-04EB",
	[6] = "sdram-lpddr3-micron-4GB",
};

static struct rk3399_sdram_params params;

enum dram_speeds {
	dram_800MHz = 800,
	dram_928MHz = 928,
};

static enum dram_speeds get_sdram_target_mhz(void)
{
	if (IS_ENABLED(CONFIG_BOARD_GOOGLE_BOB) && board_id() < 4)
		return dram_800MHz;

	return dram_928MHz;
}

const struct rk3399_sdram_params *get_sdram_config()
{
	char config_file[64];
	uint32_t ramcode;

	ramcode = ram_code();
	if (ramcode >= ARRAY_SIZE(sdram_configs) ||
	    !snprintf(config_file, sizeof(config_file), "%s-%d",
	    sdram_configs[ramcode], get_sdram_target_mhz()) ||
	    (cbfs_boot_load_struct(config_file, &params,
				   sizeof(params)) != sizeof(params)))
		die("Cannot load SDRAM parameter file!");

	return &params;
}