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jedec_dimm.c
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jedec_dimm.h
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Editing: jedec_dimm.h
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Authors: Ravi Pokala (rpokala@freebsd.org) * * Copyright (c) 2018 Panasas * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #ifndef _DEV__JEDEC_DIMM__JEDEC_DIMM_H_ #define _DEV__JEDEC_DIMM__JEDEC_DIMM_H_ /* JEDEC DIMMs include one or more SMBus devices. * * At a minimum, they have an EEPROM containing either 256 bytes (DDR3) or 512 * bytes (DDR4) of "Serial Presence Detect" (SPD) information. The SPD contains * data used by the memory controller to configure itself, and it also includes * asset information. The layout of SPD data is defined in: * * JEDEC Standard 21-C, Annex K (DDR3) * JEDEC Standard 21-C, Annex L (DDR4) * * DIMMs may also include a "Thermal Sensor on DIMM" (TSOD), which reports * temperature data. While not strictly required, the TSOD is so often included * that JEDEC defined standards for single chips which include both SPD and TSOD * functions. They respond on multiple SMBus addresses, depending on the * function. * * JEDEC Standard 21-C, TSE2002av (DDR3) * JEDEC Standard 21-C, TSE2004av (DDR4) */ /* TSE2004av defines several Device Type Identifiers (DTIs), which are the high * nybble of the SMBus address. Addresses with DTIs of PROTECT (or PAGE, which * has the same value) are essentially "broadcast" addresses; all SPD devices * respond to them, changing their mode based on the Logical Serial Address * (LSA) encoded in bits [3:1]. For normal SPD access, bits [3:1] encode the * DIMM slot number. */ #define JEDEC_SPD_PAGE_SIZE 256 #define JEDEC_DTI_SPD 0xa0 #define JEDEC_DTI_TSOD 0x30 #define JEDEC_DTI_PROTECT 0x60 #define JEDEC_LSA_PROTECT_SET0 0x02 #define JEDEC_LSA_PROTECT_SET1 0x08 #define JEDEC_LSA_PROTECT_SET2 0x0a #define JEDEC_LSA_PROTECT_SET3 0x00 #define JEDEC_LSA_PROTECT_CLR 0x06 #define JEDEC_LSA_PROTECT_GET0 0x03 #define JEDEC_LSA_PROTECT_GET1 0x09 #define JEDEC_LSA_PROTECT_GET2 0x0b #define JEDEC_LSA_PROTECT_GET3 0x01 #define JEDEC_DTI_PAGE 0x60 #define JEDEC_LSA_PAGE_SET0 0x0c #define JEDEC_LSA_PAGE_SET1 0x0e #define JEDEC_LSA_PAGE_GET 0x0d /* The offsets and lengths of various SPD bytes are defined in Annex K (DDR3) * and Annex L (DDR4). Conveniently, the DRAM type is at the same offset for * both versions. * * This list only includes information needed to get the asset information and * calculate the DIMM capacity. */ #define SPD_OFFSET_DRAM_TYPE 2 #define SPD_OFFSET_DDR3_SDRAM_CAPACITY 4 #define SPD_OFFSET_DDR3_DIMM_RANKS 7 #define SPD_OFFSET_DDR3_SDRAM_WIDTH 7 #define SPD_OFFSET_DDR3_BUS_WIDTH 8 #define SPD_OFFSET_DDR3_TSOD_PRESENT 32 #define SPD_OFFSET_DDR3_SERIAL 122 #define SPD_LEN_DDR3_SERIAL 4 #define SPD_OFFSET_DDR3_PARTNUM 128 #define SPD_LEN_DDR3_PARTNUM 18 #define SPD_OFFSET_DDR4_SDRAM_CAPACITY 4 #define SPD_OFFSET_DDR4_SDRAM_PKG_TYPE 6 #define SPD_OFFSET_DDR4_DIMM_RANKS 12 #define SPD_OFFSET_DDR4_SDRAM_WIDTH 12 #define SPD_OFFSET_DDR4_BUS_WIDTH 13 #define SPD_OFFSET_DDR4_TSOD_PRESENT 14 #define SPD_OFFSET_DDR4_SERIAL 325 #define SPD_LEN_DDR4_SERIAL 4 #define SPD_OFFSET_DDR4_PARTNUM 329 #define SPD_LEN_DDR4_PARTNUM 20 /* The "DRAM Type" field of the SPD enumerates various memory technologies which * have been used over the years. The list is append-only, so we need only refer * to the latest SPD specification. In this case, Annex L for DDR4. */ enum dram_type { DRAM_TYPE_RESERVED = 0x00, DRAM_TYPE_FAST_PAGE_MODE = 0x01, DRAM_TYPE_EDO = 0x02, DRAM_TYPE_PIPLEINED_NYBBLE = 0x03, DRAM_TYPE_SDRAM = 0x04, DRAM_TYPE_ROM = 0x05, DRAM_TYPE_DDR_SGRAM = 0x06, DRAM_TYPE_DDR_SDRAM = 0x07, DRAM_TYPE_DDR2_SDRAM = 0x08, DRAM_TYPE_DDR2_SDRAM_FBDIMM = 0x09, DRAM_TYPE_DDR2_SDRAM_FBDIMM_PROBE = 0x0a, DRAM_TYPE_DDR3_SDRAM = 0x0b, DRAM_TYPE_DDR4_SDRAM = 0x0c, DRAM_TYPE_RESERVED_0D = 0x0d, DRAM_TYPE_DDR4E_SDRAM = 0x0e, DRAM_TYPE_LPDDR3_SDRAM = 0x0f, DRAM_TYPE_LPDDR4_SDRAM = 0x10, }; /* The TSOD is accessed using a simple word interface, which is identical * between TSE2002av (DDR3) and TSE2004av (DDR4). */ #define TSOD_REG_CAPABILITES 0 #define TSOD_REG_CONFIG 1 #define TSOD_REG_LIM_HIGH 2 #define TSOD_REG_LIM_LOW 3 #define TSOD_REG_LIM_CRIT 4 #define TSOD_REG_TEMPERATURE 5 #define TSOD_REG_MANUFACTURER 6 #define TSOD_REG_DEV_REV 7 #endif /* _DEV__JEDEC_DIMM__JEDEC_DIMM_H_ */ /* vi: set ts=8 sw=4 sts=8 noet: */
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