88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2019 Facebook, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* JEDEC Standard No. 21-C
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* Annex L: Serial Presence Detect (SPD) for DDR4 SDRAM Modules
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*/
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#ifndef DEVICE_DRAM_DDR4L_H
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#define DEVICE_DRAM_DDR4L_H
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/**
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* @file ddr4.h
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*
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* \brief Utilities for decoding DDR4 SPDs
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*/
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#include <stdint.h>
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#include <spd.h>
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#include <device/dram/common.h>
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#include <types.h>
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#define SPD_DDR4_PART_OFF 329
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#define SPD_DDR4_PART_LEN 20
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/*
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* Module type (byte 3, bits 3:0) of SPD
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* This definition is specific to DDR4. DDR2/3 SPDs have a different structure.
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*/
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enum spd_dimm_type {
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SPD_DIMM_TYPE_EXTENDED = 0x0,
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SPD_DIMM_TYPE_RDIMM = 0x1,
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SPD_DIMM_TYPE_UDIMM = 0x2,
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SPD_DIMM_TYPE_SO_DIMM = 0x3,
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SPD_DIMM_TYPE_LRDIMM = 0x4,
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SPD_DIMM_TYPE_MINI_RDIMM = 0x5,
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SPD_DIMM_TYPE_MINI_UDIMM = 0x6,
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SPD_DIMM_TYPE_72B_SO_RDIMM = 0x8,
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SPD_DIMM_TYPE_72B_SO_UDIMM = 0x9,
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SPD_DIMM_TYPE_16B_SO_DIMM = 0xc,
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SPD_DIMM_TYPE_32B_SO_DIMM = 0xd,
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/* Masks to bits 3:0 to give the dimm type */
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SPD_DIMM_TYPE_MASK = 0xf
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};
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/**
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* \brief DIMM characteristics
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*
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* The characteristics of each DIMM, as presented by the SPD
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*/
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typedef struct dimm_attr_st {
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enum spd_memory_type dram_type;
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enum spd_dimm_type dimm_type;
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char part_number[SPD_DDR4_PART_LEN + 1];
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u8 serial_number[4];
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u8 bus_width;
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u8 ranks;
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u8 sdram_width;
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u16 cap_per_die_mbit;
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u16 size_mb;
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u16 manufacturer_id;
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u16 vdd_voltage;
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bool ecc_extension;
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} dimm_attr;
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typedef u8 spd_raw_data[512];
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int spd_decode_ddr4(dimm_attr *dimm, spd_raw_data spd);
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enum cb_err spd_add_smbios17_ddr4(const u8 channel, const u8 slot,
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const u16 selected_freq,
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const dimm_attr *info);
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#endif /* DEVICE_DRAM_DDR4L_H */
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