soc/intel/xeon_sp/cpx: Add save_dimm_info for SMBIOS type 17

For now only implement for one socket and some of the fields
are hard-coded for DDR4 including memory device type, data width
and ECC support.

Change-Id: I3cb72d18027d972140828970206834ff55b72022
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45798
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

6 files changed, 229 insertions, 3 deletions

diff --git a/src/soc/intel/xeon_sp/cpx/Makefile.inc b/src/soc/intel/xeon_sp/cpx/Makefile.inc
index b1fcd0481f..79a83b5416 100644
--- a/src/soc/intel/xeon_sp/cpx/Makefile.inc
+++ b/src/soc/intel/xeon_sp/cpx/Makefile.inc
@@ -8,7 +8,7 @@ subdirs-y += ../../../../cpu/x86/mtrr
 subdirs-y += ../../../../cpu/x86/tsc
 subdirs-y += ../../../../cpu/intel/microcode
 
-romstage-y += romstage.c
+romstage-y += romstage.c ddr.c
 romstage-$(CONFIG_DISPLAY_UPD_DATA) += upd_display.c
 romstage-$(CONFIG_DISPLAY_HOBS) += hob_display.c
 
diff --git a/src/soc/intel/xeon_sp/cpx/ddr.c b/src/soc/intel/xeon_sp/cpx/ddr.c
new file mode 100644
index 0000000000..0fa36ab6c9
--- /dev/null
+++ b/src/soc/intel/xeon_sp/cpx/ddr.c
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <soc/ddr.h>
+
+uint32_t get_ddr_voltage(uint8_t DdrVoltage)
+{
+	/* SPD Byte 11: Module Nominal Voltage, currently DDR4 only supports 1.2V.
+	   Either Bit 0 or Bit 1 is set, return 1.2V */
+	if (DdrVoltage & 0x3)
+		return 1200;
+	return 0;
+}
+
+uint16_t get_max_memory_speed(uint32_t commonTck)
+{
+	if (commonTck <= DDR_8400_TCK_MIN)
+		return 8400;
+	else if (commonTck <= DDR_6400_TCK_MIN)
+		return 6400;
+	else if (commonTck <= DDR_6000_TCK_MIN)
+		return 6000;
+	else if (commonTck <= DDR_5600_TCK_MIN)
+		return 5600;
+	else if (commonTck <= DDR_5200_TCK_MIN)
+		return 5200;
+	else if (commonTck <= DDR_4800_TCK_MIN)
+		return 4800;
+	else if (commonTck <= DDR_4400_TCK_MIN)
+		return 4400;
+	else if (commonTck <= DDR_4266_TCK_MIN)
+		return 4266;
+	else if (commonTck <= DDR_4200_TCK_MIN)
+		return 4200;
+	else if (commonTck <= DDR_4000_TCK_MIN)
+		return 4000;
+	else if (commonTck <= DDR_3800_TCK_MIN)
+		return 3800;
+	else if (commonTck <= DDR_3733_TCK_MIN)
+		return 3733;
+	else if (commonTck <= DDR_3600_TCK_MIN)
+		return 3600;
+	else if (commonTck <= DDR_3466_TCK_MIN)
+		return 3466;
+	else if (commonTck <= DDR_3400_TCK_MIN)
+		return 3400;
+	else if (commonTck <= DDR_3200_TCK_MIN)
+		return 3200;
+	else if (commonTck <= DDR_3000_TCK_MIN)
+		return 3000;
+	else if (commonTck <= DDR_2933_TCK_MIN)
+		return 2933;
+	else if (commonTck <= DDR_2800_TCK_MIN)
+		return 2800;
+	else if (commonTck <= DDR_2666_TCK_MIN)
+		return 2666;
+	else if (commonTck <= DDR_2600_TCK_MIN)
+		return 2600;
+	else if (commonTck <= DDR_2400_TCK_MIN)
+		return 2400;
+	else if (commonTck <= DDR_2200_TCK_MIN)
+		return 2200;
+	else if (commonTck <= DDR_2133_TCK_MIN)
+		return 2133;
+	else if (commonTck <= DDR_2000_TCK_MIN)
+		return 2000;
+	else if (commonTck <= DDR_1866_TCK_MIN)
+		return 1866;
+	else if (commonTck <= DDR_1800_TCK_MIN)
+		return 1800;
+	else if (commonTck <= DDR_1600_TCK_MIN)
+		return 1600;
+	else if (commonTck <= DDR_1400_TCK_MIN)
+		return 1400;
+	else if (commonTck <= DDR_1333_TCK_MIN)
+		return 1333;
+	else if (commonTck <= DDR_1200_TCK_MIN)
+		return 1200;
+	else if (commonTck <= DDR_1066_TCK_MIN)
+		return 1066;
+	else if (commonTck <= DDR_1000_TCK_MIN)
+		return 1000;
+	else
+		return 800;
+}
diff --git a/src/soc/intel/xeon_sp/cpx/include/soc/ddr.h b/src/soc/intel/xeon_sp/cpx/include/soc/ddr.h
new file mode 100644
index 0000000000..61a5ebe338
--- /dev/null
+++ b/src/soc/intel/xeon_sp/cpx/include/soc/ddr.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef _CPX_DDR_H_
+#define _CPX_DDR_H_
+
+#include <stdint.h>
+
+/* DDR_*_TCK_MIN are in picoseconds */
+#define DDR_800_TCK_MIN                 2500
+#define DDR_1000_TCK_MIN                2000
+#define DDR_1066_TCK_MIN                1875
+#define DDR_1200_TCK_MIN                1667
+#define DDR_1333_TCK_MIN                1500
+#define DDR_1400_TCK_MIN                1429
+#define DDR_1600_TCK_MIN                1250
+#define DDR_1800_TCK_MIN                1110
+#define DDR_1866_TCK_MIN                1071
+#define DDR_2000_TCK_MIN                1000
+#define DDR_2133_TCK_MIN                938
+#define DDR_2200_TCK_MIN                909
+#define DDR_2400_TCK_MIN                833
+#define DDR_2600_TCK_MIN                769
+#define DDR_2666_TCK_MIN                750
+#define DDR_2800_TCK_MIN                714
+#define DDR_2933_TCK_MIN                682
+#define DDR_3000_TCK_MIN                667
+#define DDR_3200_TCK_MIN                625
+#define DDR_3400_TCK_MIN                589
+#define DDR_3466_TCK_MIN                577
+#define DDR_3600_TCK_MIN                556
+#define DDR_3733_TCK_MIN                536
+#define DDR_3800_TCK_MIN                527
+#define DDR_4000_TCK_MIN                500
+#define DDR_4200_TCK_MIN                477
+#define DDR_4266_TCK_MIN                469
+#define DDR_4400_TCK_MIN                455
+#define DDR_4800_TCK_MIN                417
+#define DDR_5200_TCK_MIN                385
+#define DDR_5600_TCK_MIN                358
+#define DDR_6000_TCK_MIN                334
+#define DDR_6400_TCK_MIN                313
+#define DDR_6800_TCK_MIN                295
+#define DDR_7200_TCK_MIN                278
+#define DDR_7600_TCK_MIN                264
+#define DDR_8000_TCK_MIN                250
+#define DDR_8400_TCK_MIN                239
+
+uint16_t get_max_memory_speed(uint32_t commonTck);
+uint32_t get_ddr_voltage(uint8_t DdrVoltage);
+
+#endif /* _CPX_DDR_H_ */
diff --git a/src/soc/intel/xeon_sp/cpx/romstage.c b/src/soc/intel/xeon_sp/cpx/romstage.c
index a198c993f3..6f47a30234 100644
--- a/src/soc/intel/xeon_sp/cpx/romstage.c
+++ b/src/soc/intel/xeon_sp/cpx/romstage.c
@@ -1,9 +1,19 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <assert.h>
 #include <arch/romstage.h>
+#include <console/console.h>
+#include <cbmem.h>
 #include <fsp/api.h>
+#include <fsp/util.h>
+#include <hob_iiouds.h>
+#include <hob_memmap.h>
+#include <soc/ddr.h>
 #include <soc/romstage.h>
 #include <soc/pci_devs.h>
+#include <soc/intel/common/smbios.h>
+#include <string.h>
+
 #include "chip.h"
 
 void __weak mainboard_memory_init_params(FSPM_UPD *mupd)
@@ -11,6 +21,86 @@ void __weak mainboard_memory_init_params(FSPM_UPD *mupd)
 	/* Default weak implementation */
 }
 
+static const struct SystemMemoryMapHob *get_system_memory_map(void)
+{
+	size_t hob_size;
+	const uint8_t mem_hob_guid[16] = FSP_SYSTEM_MEMORYMAP_HOB_GUID;
+	const struct SystemMemoryMapHob **memmap_addr;
+
+	memmap_addr = (const struct SystemMemoryMapHob **)
+		fsp_find_extension_hob_by_guid(mem_hob_guid, &hob_size);
+	/* hob_size is the size of the 8-byte address not the hob data */
+	assert(memmap_addr != NULL && hob_size != 0);
+	/* assert the pointer to the hob is not NULL */
+	assert(*memmap_addr != NULL);
+
+	return *memmap_addr;
+}
+
+/* Save the DIMM information for SMBIOS table 17 */
+void save_dimm_info(void)
+{
+	struct dimm_info *dest_dimm;
+	struct memory_info *mem_info;
+	const struct SystemMemoryMapHob *hob;
+	MEMMAP_DIMM_DEVICE_INFO_STRUCT src_dimm;
+	int dimm_max, index = 0;
+	uint32_t vdd_voltage;
+
+	hob = get_system_memory_map();
+	assert(hob != NULL);
+
+	/*
+	 * Allocate CBMEM area for DIMM information used to populate SMBIOS
+	 * table 17
+	 */
+	mem_info = cbmem_add(CBMEM_ID_MEMINFO, sizeof(*mem_info));
+	if (mem_info == NULL) {
+		printk(BIOS_ERR, "CBMEM entry for DIMM info missing\n");
+		return;
+	}
+	memset(mem_info, 0, sizeof(*mem_info));
+	dimm_max = ARRAY_SIZE(mem_info->dimm);
+	vdd_voltage = get_ddr_voltage(hob->DdrVoltage);
+	/* For now only implement for one socket and hard-coded for DDR4 */
+	for (int ch = 0; ch < MAX_CH; ch++) {
+		for (int dimm = 0; dimm < MAX_IMC; dimm++) {
+			src_dimm = hob->Socket[0].ChannelInfo[ch].DimmInfo[dimm];
+			if (src_dimm.Present) {
+				if (index >= dimm_max) {
+					printk(BIOS_WARNING, "Too many DIMMs info for %s.\n",
+						__func__);
+					return;
+				}
+				dest_dimm = &mem_info->dimm[index];
+				dest_dimm->max_speed_mts =
+					get_max_memory_speed(src_dimm.commonTck);
+				dest_dimm->configured_speed_mts = hob->memFreq;
+				dimm_info_fill(dest_dimm,
+					src_dimm.DimmSize << 6,
+					0x1a, /* hard-coded memory device type as DDR4 */
+					hob->memFreq, /* replaced by configured_speed_mts */
+					src_dimm.NumRanks,
+					ch, /* for mainboard locator string override */
+					dimm, /* for mainboard locator string override */
+					(const char *)&src_dimm.PartNumber[0],
+					sizeof(src_dimm.PartNumber),
+					(const uint8_t *)&src_dimm.serialNumber[0],
+					64, /* hard-coded for DDR4 data width */
+					vdd_voltage,
+					true, /* hard-coded as ECC supported */
+					src_dimm.VendorID,
+					src_dimm.actKeyByte2);
+				index++;
+			}
+		}
+	}
+
+	/* Save available DIMM information */
+	mem_info->dimm_cnt = index;
+	printk(BIOS_DEBUG, "%d DIMMs found\n", mem_info->dimm_cnt);
+}
+
 void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version)
 {
 	FSPM_CONFIG *m_cfg = &mupd->FspmConfig;
diff --git a/src/soc/intel/xeon_sp/include/soc/romstage.h b/src/soc/intel/xeon_sp/include/soc/romstage.h
index aa46067bbb..90689afc7f 100644
--- a/src/soc/intel/xeon_sp/include/soc/romstage.h
+++ b/src/soc/intel/xeon_sp/include/soc/romstage.h
@@ -8,5 +8,5 @@
 /* These functions are weak and can be overridden by a mainboard functions. */
 void mainboard_memory_init_params(FSPM_UPD * mupd);
 void mainboard_rtc_failed(void);
-
+void save_dimm_info(void);
 #endif /* _SOC_ROMSTAGE_H_ */
diff --git a/src/soc/intel/xeon_sp/romstage.c b/src/soc/intel/xeon_sp/romstage.c
index a4853c064e..f3e32fd9ca 100644
--- a/src/soc/intel/xeon_sp/romstage.c
+++ b/src/soc/intel/xeon_sp/romstage.c
@@ -41,7 +41,7 @@ asmlinkage void car_stage_entry(void)
 
 	/* Cache the memory-mapped boot media. */
 	postcar_frame_add_romcache(&pcf, MTRR_TYPE_WRPROT);
-
+	save_dimm_info();
 	run_postcar_phase(&pcf);
 }
 
@@ -54,3 +54,4 @@ __weak void mainboard_rtc_failed(void)
 {
 
 }
+__weak void save_dimm_info(void) { }