src/soc/intel/elkhartlake/include/soc/meminit.h

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

#ifndef _SOC_ELKHARTLAKE_MEMINIT_H_
#define _SOC_ELKHARTLAKE_MEMINIT_H_

#include <fsp/soc_binding.h>
#include <types.h>

/* Number of dq bits controlled per dqs */
#define DQ_BITS_PER_DQS 8

/* Number of memory packages, where a "package" represents a 64-bit solution */
#define DDR_NUM_PACKAGES 2

/* Number of DQ byte mappings */
#define DDR_NUM_BYTE_MAPPINGS 6

/* Number of memory DIMM slots available on Elkhart Lake */
#define NUM_DIMM_SLOT 4

/* 64-bit Channel identification */
enum {
	DDR_CH0,
	DDR_CH1,
	DDR_NUM_CHANNELS
};

struct spd_by_pointer {
	size_t spd_data_len;
	uintptr_t spd_data_ptr;
};

enum mem_info_read_type {
	READ_SPD_CBFS,	/* Find SPD file in CBFS. */
	READ_SMBUS,	/* Read on-module SPD by SMBUS. */
	READ_SPD_MEMPTR	/* Find SPD data from pointer. */
};

struct spd_info {
	enum mem_info_read_type read_type;
	union spd_data_by {
		/* To read on-module SPD when read_type is READ_SMBUS. */
		uint8_t spd_smbus_address[NUM_DIMM_SLOT];

		/* To identify SPD file when read_type is READ_SPD_CBFS. */
		int spd_index;

		/* To find SPD data when read_type is READ_SPD_MEMPTR. */
		struct spd_by_pointer spd_data_ptr_info;
	} spd_spec;
};

/* Board-specific memory dq mapping information */
struct mb_cfg {

	/*
	 * For each channel, there are 6 sets of DQ byte mappings,
	 * where each set has a package 0 and a package 1 value (package 0
	 * represents the first 64-bit lpddr4 chip combination, and package 1
	 * represents the second 64-bit lpddr4 chip combination).
	 * The first three sets are for CLK, CMD, and CTL.
	 * The fsp package actually expects 6 sets, even though the last 3 sets
	 * are not used in EHL.
	 * We let the meminit_dq_dqs_map routine take care of clearing the
	 * unused fields for the caller.
	 * Note that dq_map is only used by LPDDR; it does not need to be
	 * initialized for designs using DDR4.
	 */
	uint8_t dq_map[DDR_NUM_CHANNELS][DDR_NUM_BYTE_MAPPINGS][DDR_NUM_PACKAGES];

	/*
	 * DQS CPU<>DRAM map Ch0 and Ch1.  Each array entry represents a
	 * mapping of a dq bit on the CPU to the bit it's connected to on
	 * the memory part.  The array index represents the dqs bit number
	 * on the memory part, and the values in the array represent which
	 * pin on the CPU that DRAM pin connects to.
	 * dqs_map is only used by LPDDR; same comments apply as for dq_map
	 * above.
	 */
	uint8_t dqs_map[DDR_NUM_CHANNELS][DQ_BITS_PER_DQS];

	/*
	 * Rcomp resistor values.  These values represent the resistance in
	 * ohms of the three rcomp resistors attached to the DDR_COMP_0,
	 * DDR_COMP_1, and DDR_COMP_2 pins on the DRAM.
	 */
	uint16_t rcomp_resistor[3];

	/*
	 * Rcomp target values.  These will typically be the following
	 * values for Elkhart Lake : { 60, 40, 30, 20, 30 }
	 */
	uint16_t rcomp_targets[5];

	/*
	 * Indicates whether memory is interleaved.
	 * Set to 1 for an interleaved design,
	 * set to 0 for non-interleaved design.
	 */
	uint8_t dq_pins_interleaved;

	/*
	 * VREF_CA configuration.
	 * Set to 0 VREF_CA goes to both CH_A and CH_B,
	 * set to 1 VREF_CA goes to CH_A and VREF_DQ_A goes to CH_B,
	 * set to 2 VREF_CA goes to CH_A and VREF_DQ_B goes to CH_B.
	 */
	uint8_t vref_ca_config;

	/*
	 * Early Command Training Enable/Disable Control
	 * 1 = enable, 0 = disable
	 */
	uint8_t ect;

	/* Board type */
	uint8_t UserBd;
};

/*
 * Initialize default memory configurations for Elkhart Lake.
 */

void memcfg_init(FSP_M_CONFIG *mem_cfg, const struct mb_cfg *board_cfg,
			const struct spd_info *spd_info, bool half_populated);

#endif /* _SOC_ELKHARTLAKE_MEMINIT_H_ */