src/mainboard/system76/lemp9/romstage.c

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

#include <soc/cnl_memcfg_init.h>
#include <soc/romstage.h>

static const struct cnl_mb_cfg memcfg = {
	/* Parameters required to access SPD for CH0D0/CH0D1/CH1D0/CH1D1. */
	.spd[0] = {
		.read_type = READ_SPD_CBFS,
		.spd_spec = {.spd_index = 0},
	},
	.spd[1] = {.read_type = NOT_EXISTING},
	.spd[2] = {
		.read_type = READ_SMBUS,
		.spd_spec = {.spd_smbus_address = 0xa4},
	},
	.spd[3] = {.read_type = NOT_EXISTING},

	/*
	 * For each channel, there are 3 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, but the last 3 sets are
	 * not used in CNL, so we only define the three sets that are used
	 * and let the meminit_lpddr4() routine take care of clearing the
	 * unused fields for the caller.
	 */
	.dq_map[DDR_CH0] = {
		{0x0F, 0xF0}, {0x00, 0xF0}, {0x0F, 0xF0},
		//{0x0F, 0x00}, {0xFF, 0x00}, {0xFF, 0x00}
	},
	.dq_map[DDR_CH1] = {
		{0x33, 0xCC}, {0x00, 0xCC}, {0x33, 0xCC},
		//{0x33, 0x00}, {0xFF, 0x00}, {0xFF, 0x00}
	},

	/*
	 * 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[DDR_CH0] = {0, 1, 2, 3, 4, 5, 6, 7},
	.dqs_map[DDR_CH1] = {1, 0, 2, 3, 4, 5, 6, 7},

	/*
	 * 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.
	 */
	.rcomp_resistor = { 121, 81, 100 },

	/*
	 * Rcomp target values.  These will typically be the following
	 * values for Cannon Lake : { 80, 40, 40, 40, 30 }
	 */
	.rcomp_targets = { 100, 40, 20, 20, 26 },

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

	/*
	 * 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.
	 */
	.vref_ca_config = 2,

	/* Early Command Training */
	.ect = 0,
};

void mainboard_memory_init_params(FSPM_UPD *memupd)
{
	cannonlake_memcfg_init(&memupd->FspmConfig, &memcfg);
}