soc/intel/tigerlake: add memory configuration support

Move some of the common memory code that was being performed in
mainboard into the soc to reduce redundant code going forward.

BUG=b:145642089
BRANCH=none
TEST="emerge-volteer coreboot chromeos-bootimage", flash and boot
volteer, log into kernel and verify memory size shows 8GB.

Change-Id: I8de502d4f05d52b9dae34e3b013c6d5b1886fa55
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38606
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

3 files changed, 235 insertions, 0 deletions

diff --git a/src/soc/intel/tigerlake/Makefile.inc b/src/soc/intel/tigerlake/Makefile.inc
index 532861dbe1..56119f50db 100644
--- a/src/soc/intel/tigerlake/Makefile.inc
+++ b/src/soc/intel/tigerlake/Makefile.inc
@@ -25,6 +25,7 @@ bootblock-y += p2sb.c
 
 romstage-y += espi.c
 romstage-y += gpio.c
+romstage-$(CONFIG_SOC_INTEL_TIGERLAKE) += meminit_tgl.c
 romstage-y += reset.c
 
 ramstage-y += acpi.c
diff --git a/src/soc/intel/tigerlake/include/soc/meminit_tgl.h b/src/soc/intel/tigerlake/include/soc/meminit_tgl.h
new file mode 100644
index 0000000000..dd0541809e
--- /dev/null
+++ b/src/soc/intel/tigerlake/include/soc/meminit_tgl.h
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2020 The coreboot project Authors.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef _SOC_MEMINIT_TGL_H_
+#define _SOC_MEMINIT_TGL_H_
+
+#include <stddef.h>
+#include <stdint.h>
+#include <fsp/soc_binding.h>
+
+#define BYTES_PER_CHANNEL	2
+#define BITS_PER_BYTE		8
+#define DQS_PER_CHANNEL		2
+#define NUM_CHANNELS		8
+
+struct spd_by_pointer {
+	size_t spd_data_len;
+	uintptr_t spd_data_ptr;
+};
+
+enum mem_info_read_type {
+	NOT_EXISTING,	/* No memory in this channel */
+	READ_SPD_CBFS,	/* Find spd file in CBFS. */
+	READ_SPD_MEMPTR	/* Find spd data from pointer. */
+};
+
+struct spd_info {
+	enum mem_info_read_type read_type;
+	union spd_data_by {
+		/* 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 configuration information */
+struct mb_lpddr4x_cfg {
+	/* DQ mapping */
+	uint8_t dq_map[NUM_CHANNELS][BYTES_PER_CHANNEL * BITS_PER_BYTE];
+
+	/*
+	 * DQS CPU<>DRAM map.  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.
+	 */
+	uint8_t dqs_map[NUM_CHANNELS][DQS_PER_CHANNEL];
+
+	/*
+	 * Early Command Training Enable/Disable Control
+	 * 1 = enable, 0 = disable
+	 */
+	uint8_t ect;
+};
+
+/* Initialize default memory configurations for dimm0-only lpddr4x */
+void meminit_lpddr4x_dimm0(FSP_M_CONFIG *mem_cfg,
+			   const struct mb_lpddr4x_cfg *board_cfg,
+			   const struct spd_info *spd,
+			   bool half_populated);
+
+#endif /* _SOC_MEMINIT_TGL_H_ */
diff --git a/src/soc/intel/tigerlake/meminit_tgl.c b/src/soc/intel/tigerlake/meminit_tgl.c
new file mode 100644
index 0000000000..922f66a543
--- /dev/null
+++ b/src/soc/intel/tigerlake/meminit_tgl.c
@@ -0,0 +1,164 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2020 The coreboot project Authors.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <assert.h>
+#include <console/console.h>
+#include <fsp/util.h>
+#include <soc/meminit_tgl.h>
+#include <spd_bin.h>
+#include <string.h>
+
+enum dimm_enable_options {
+	ENABLE_BOTH_DIMMS = 0,
+	DISABLE_DIMM0 = 1,
+	DISABLE_DIMM1 = 2,
+	DISABLE_BOTH_DIMMS = 3
+};
+
+#define MEM_INIT_CH_DQ_DQS_MAP(_mem_cfg, _b_cfg, _ch)		\
+	do {							\
+		memcpy(&_mem_cfg->DqMapCpu2DramCh ## _ch,	\
+		       &_b_cfg->dq_map[_ch],			\
+			sizeof(_b_cfg->dq_map[_ch]));		\
+		memcpy(&_mem_cfg->DqsMapCpu2DramCh ## _ch,	\
+			&_b_cfg->dqs_map[_ch],			\
+			sizeof(_b_cfg->dqs_map[_ch]));		\
+	} while (0)
+
+
+static void spd_read_from_cbfs(const struct spd_info *spd,
+			       uintptr_t *spd_data_ptr, size_t *spd_data_len)
+{
+	struct region_device spd_rdev;
+	size_t spd_index = spd->spd_spec.spd_index;
+
+	printk(BIOS_DEBUG, "SPD INDEX = %lu\n", spd_index);
+	if (get_spd_cbfs_rdev(&spd_rdev, spd_index) < 0)
+		die("spd.bin not found or incorrect index\n");
+
+	*spd_data_len = region_device_sz(&spd_rdev);
+
+	/* Memory leak is ok since we have memory mapped boot media */
+	assert(CONFIG(BOOT_DEVICE_MEMORY_MAPPED));
+
+	*spd_data_ptr = (uintptr_t)rdev_mmap_full(&spd_rdev);
+}
+
+static void get_spd_data(const struct spd_info *spd,
+			 uintptr_t *spd_data_ptr, size_t *spd_data_len)
+{
+	if (spd->read_type == READ_SPD_MEMPTR) {
+		*spd_data_ptr = spd->spd_spec.spd_data_ptr_info.spd_data_ptr;
+		*spd_data_len = spd->spd_spec.spd_data_ptr_info.spd_data_len;
+		return;
+	}
+
+	if (spd->read_type == READ_SPD_CBFS) {
+		spd_read_from_cbfs(spd, spd_data_ptr, spd_data_len);
+		return;
+	}
+
+	die("no valid way to read SPD info");
+}
+
+static void meminit_dq_dqs_map(FSP_M_CONFIG *mem_cfg,
+			       const struct mb_lpddr4x_cfg *board_cfg,
+			       bool half_populated)
+{
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 0);
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 1);
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 2);
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 3);
+
+	if (half_populated)
+		return;
+
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 4);
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 5);
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 6);
+	MEM_INIT_CH_DQ_DQS_MAP(mem_cfg, board_cfg, 7);
+}
+
+static void meminit_channels_dimm0(FSP_M_CONFIG *mem_cfg,
+				   const struct mb_lpddr4x_cfg *board_cfg,
+				   uintptr_t spd_data_ptr,
+				   bool half_populated)
+{
+	uint8_t dimm_cfg = DISABLE_DIMM1; /* Use only DIMM0 */
+
+	/* Channel 0 */
+	mem_cfg->Reserved9[0] = dimm_cfg;
+	mem_cfg->MemorySpdPtr00 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr01 = 0;
+
+	/* Channel 1 */
+	mem_cfg->Reserved9[1] = dimm_cfg;
+	mem_cfg->MemorySpdPtr02 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr03 = 0;
+
+	/* Channel 2 */
+	mem_cfg->Reserved9[2] = dimm_cfg;
+	mem_cfg->MemorySpdPtr04 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr05 = 0;
+
+	/* Channel 3 */
+	mem_cfg->Reserved9[3] = dimm_cfg;
+	mem_cfg->MemorySpdPtr06 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr07 = 0;
+
+	if (half_populated) {
+		printk(BIOS_INFO, "%s: DRAM half-populated\n", __func__);
+		dimm_cfg = DISABLE_BOTH_DIMMS;
+		spd_data_ptr = 0;
+	}
+
+	/* Channel 4 */
+	mem_cfg->Reserved9[4] = dimm_cfg;
+	mem_cfg->MemorySpdPtr08 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr09 = 0;
+
+	/* Channel 5 */
+	mem_cfg->Reserved9[5] = dimm_cfg;
+	mem_cfg->MemorySpdPtr10 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr11 = 0;
+
+	/* Channel 6 */
+	mem_cfg->Reserved9[6] = dimm_cfg;
+	mem_cfg->MemorySpdPtr12 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr13 = 0;
+
+	/* Channel 7 */
+	mem_cfg->Reserved9[7] = dimm_cfg;
+	mem_cfg->MemorySpdPtr14 = spd_data_ptr;
+	mem_cfg->MemorySpdPtr15 = 0;
+
+	meminit_dq_dqs_map(mem_cfg, board_cfg, half_populated);
+}
+
+/* Initialize onboard memory configurations for lpddr4x */
+void meminit_lpddr4x_dimm0(FSP_M_CONFIG *mem_cfg,
+			   const struct mb_lpddr4x_cfg *board_cfg,
+			   const struct spd_info *spd,
+			   bool half_populated)
+
+{
+	size_t spd_data_len;
+	uintptr_t spd_data_ptr;
+
+	get_spd_data(spd, &spd_data_ptr, &spd_data_len);
+	print_spd_info((unsigned char *)spd_data_ptr);
+
+	mem_cfg->MemorySpdDataLen = spd_data_len;
+	meminit_channels_dimm0(mem_cfg, board_cfg, spd_data_ptr,
+			       half_populated);
+
+	/* LPDDR4 does not allow interleaved memory */
+	mem_cfg->DqPinsInterleaved = 0;
+	mem_cfg->ECT = board_cfg->ect;
+	mem_cfg->MrcSafeConfig = 0x1;
+}