/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2013 Google Inc.
 * Copyright (C) 2015 Intel Corp.
 *
 * 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 <cbfs.h>
#include <console/console.h>
#include <lib.h>
#include <soc/gpio.h>
#include <soc/romstage.h>
#include <string.h>

#define SPD_SIZE 256
#define SATA_GP3_PAD_CFG0       0x5828
#define I2C3_SCL_PAD_CFG0       0x5438
#define MF_PLT_CLK1_PAD_CFG0    0x4410
#define I2C3_SDA_PAD_CFG0       0x5420

/*
 * 0b0000 - 4GiB total - 2 x 2GiB Samsung K4B4G1646Q-HYK0 1600MHz
 * 0b0001 - 4GiB total - 2 x 2GiB Hynix  H5TC4G63CFR-PBA 1600MHz
 * 0b0010- 2GiB total - 1 x 2GiB Samsung K4B4G1646Q-HYK0 1600MHz
 * 0b0011 - 2GiB total - 1 x 2GiB Hynix  H5TC4G63CFR-PBA 1600MHz
 */
static const uint32_t dual_channel_config = (1 << 0);

static void *get_spd_pointer(char *spd_file_content, int total_spds, int *dual)
{
	int ram_id = 0;
	ram_id |= get_gpio(COMMUNITY_GPSOUTHWEST_BASE, SATA_GP3_PAD_CFG0) << 0;
	ram_id |= get_gpio(COMMUNITY_GPSOUTHWEST_BASE, I2C3_SCL_PAD_CFG0) << 1;
	ram_id |= get_gpio(COMMUNITY_GPSOUTHEAST_BASE, MF_PLT_CLK1_PAD_CFG0)
		<< 2;
	ram_id |= get_gpio(COMMUNITY_GPSOUTHWEST_BASE, I2C3_SDA_PAD_CFG0) << 3;

	/*
	 * There are only 2 SPDs supported on Cyan Board:
	 * Samsung 4G:0000 & Hynix 2G:0011
	 */

	/*
	 * RAMID0 on the first boot does not read the correct value,so checking
	 * bit 1 is enough as WA
	 */
	if (ram_id > 0)
		ram_id = 3;
	printk(BIOS_DEBUG, "ram_id=%d, total_spds: %d\n", ram_id, total_spds);

	if (ram_id >= total_spds)
		return NULL;

	/* Single channel configs */
	if (dual_channel_config & (1 << ram_id))
		*dual = 1;

	return &spd_file_content[SPD_SIZE * ram_id];
}

/* Copy SPD data for on-board memory */
void mainboard_fill_spd_data(struct pei_data *ps)
{
	char *spd_file;
	size_t spd_file_len;
	void *spd_content;
	int dual_channel = 0;

	/* Find the SPD data in CBFS. */
	spd_file = cbfs_boot_map_with_leak("spd.bin", CBFS_TYPE_SPD,
		&spd_file_len);
	if (!spd_file)
		die("SPD data not found.");

	if (spd_file_len < SPD_SIZE)
		die("Missing SPD data.");

	/*
	 * Both channels are always present in SPD data. Always use matched
	 * DIMMs so use the same SPD data for each DIMM.
	 */
	spd_content = get_spd_pointer(spd_file,
				      spd_file_len / SPD_SIZE,
				      &dual_channel);
	if (IS_ENABLED(CONFIG_DISPLAY_SPD_DATA) && spd_content != NULL) {
		printk(BIOS_DEBUG, "SPD Data:\n");
		hexdump(spd_content, SPD_SIZE);
		printk(BIOS_DEBUG, "\n");
	}

	/*
	 * Set SPD and memory configuration:
	 * Memory type: 0=DimmInstalled,
	 *              1=SolderDownMemory,
	 *              2=DimmDisabled
	 */
	if (spd_content != NULL) {
		ps->spd_data_ch0 = spd_content;
		ps->spd_ch0_config = 1;
		if (dual_channel) {
			ps->spd_data_ch1 = spd_content;
			ps->spd_ch1_config = 1;
		} else {
			ps->spd_ch1_config = 2;
		}
	}
}