mb/intel/ehlcrb: Add EHL CRB memory initialization support

Update memory parameters based on memory type supported by
Elkhart Lake CRB:

1. Update spd data for EHL LPDDR4X memory
   - DQ byte map
   - DQS CPU-DRAM map
   - Rcomp resistor
   - Rcomp target
2. Add configurations for vref_ca & interleaved memory
3. Add EHL CRB on board LPDDR4X SPD data bin file
4. Update mainboard related FSPM UPDs as part of memory
   initialization

Signed-off-by: Tan, Lean Sheng <lean.sheng.tan@intel.com>
Change-Id: Ifd85caa9ac1c9baf443734eb17ad5683ee92ca3b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48127
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>

src/mainboard/intel/elkhartlake_crb/romstage_fsp_params.c

@@ -7,5 +7,15 @@
 
 void mainboard_memory_init_params(FSPM_UPD *memupd)
 {
-	/* ToDo : Fill FSP-M spd related memory params */
+	static struct spd_info ehlcrb_spd_info;
+	const struct mb_cfg *board_cfg = variant_memcfg_config();
+
+	/* TODO: Read the resistor strap to get number of memory segments */
+	bool half_populated = false;
+	/* Initialize spd information for LPDDR4x board */
+	ehlcrb_spd_info.read_type = READ_SPD_CBFS;
+	ehlcrb_spd_info.spd_spec.spd_index = 0x00;
+
+	/* Initialize variant specific configurations */
+	memcfg_init(&memupd->FspmConfig, board_cfg, &ehlcrb_spd_info, half_populated);
 }

src/mainboard/intel/elkhartlake_crb/spd/Makefile.inc

@@ -1,3 +1,3 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
-SPD_SOURCES = empty	# 0b000
+SPD_SOURCES = ehlcrb	# 0b000

src/mainboard/intel/elkhartlake_crb/spd/ehlcrb.spd.hex

@@ -0,0 +1,32 @@
+23 11 11 0E 15 21 90 08 00 40 00 00 02 22 00 00
+00 00 04 0F 92 54 05 00 87 00 90 A8 90 C0 08 60
+04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 E1 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 20 00 00 00 20 20 20 20 20 20 20
+20 20 20 20 20 20 20 20 20 20 20 20 20 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

src/mainboard/intel/elkhartlake_crb/variants/ehlcrb/memory.c

@@ -5,4 +5,55 @@
 #include <soc/meminit.h>
 #include <soc/romstage.h>
 
-/* ToDo : Fill EHL related memory configs */
+static const struct mb_cfg ehlcrb_lpddr4x_memcfg_cfg = {
+
+	.dq_map[DDR_CH0] = {
+		{0xf, 0xf0},
+		{0xf, 0xf0},
+		{0xff, 0x0},
+		{0x0, 0x0},
+		{0x0, 0x0},
+		{0x0, 0x0}
+	},
+
+	.dq_map[DDR_CH1] = {
+		{0xf, 0xf0},
+		{0xf, 0xf0},
+		{0xff, 0x0},
+		{0x0, 0x0},
+		{0x0, 0x0},
+		{0x0, 0x0}
+	},
+
+	/*
+	 * The dqs_map arrays map the ddr4 pins to the SoC pins
+	 * for both channels.
+	 *
+	 * the index = pin number on ddr4 part
+	 * the value = pin number on SoC
+	 */
+	.dqs_map[DDR_CH0] = {3, 0, 1, 2, 7, 4, 5, 6},
+	.dqs_map[DDR_CH1] = {3, 0, 1, 2, 7, 4, 5, 6},
+
+	/* Baseboard uses 100, 100 and 100 rcomp resistors */
+	.rcomp_resistor = {100, 100, 100},
+
+	.rcomp_targets = {60, 40, 30, 20, 30},
+
+	/* LPDDR4x does not allow interleaved memory */
+	.dq_pins_interleaved = 0,
+
+	/* Baseboard is using config 2 for vref_ca */
+	.vref_ca_config = 2,
+
+	/* Enable Early Command Training */
+	.ect = 1,
+
+	/* Set Board Type */
+	.UserBd = BOARD_TYPE_MOBILE,
+};
+
+const struct mb_cfg *variant_memcfg_config(void)
+{
+	return &ehlcrb_lpddr4x_memcfg_cfg;
+}

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

@@ -88,10 +88,25 @@ struct mb_cfg {
 
 	/*
 	 * Rcomp target values.  These will typically be the following
-	 * values for Elkhart Lake : { 80, 40, 40, 40, 30 }
+	 * 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

src/soc/intel/elkhartlake/meminit.c

@@ -109,6 +109,7 @@ void memcfg_init(FSP_M_CONFIG *mem_cfg, const struct mb_cfg *board_cfg,
 
 	/* Early Command Training Enabled */
 	mem_cfg->ECT = board_cfg->ect;
-
+	mem_cfg->DqPinsInterleaved = board_cfg->dq_pins_interleaved;
+	mem_cfg->CaVrefConfig = board_cfg->vref_ca_config;
 	mem_cfg->UserBd = board_cfg->UserBd;
 }