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/*
* This file is part of the LinuxBIOS project.
*
* Copyright (C) 2005 Digital Design Corporation
* Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Serial Presence Detect (SPD) data stored on SDRAM modules.
*
* Datasheet:
* - Name: PC SDRAM Serial Presence Detect (SPD) Specification
* Revision 1.2A, December, 1997
* - PDF: http://www.intel.com/design/chipsets/memory/spdsd12a.pdf
*
* Datasheet (alternative):
* - Name: SERIAL PRESENCE DETECT STANDARD, General Standard
* JEDEC Standard No. 21-C
* - PDF: http://www.jedec.org/download/search/4_01_02_00R9.PDF
*/
#ifndef _SPD_H_
#define _SPD_H_
/* Byte numbers. */
#define SPD_NUM_MANUFACTURER_BYTES 0 /* Number of bytes used by module manufacturer */
#define SPD_TOTAL_SPD_MEMORY_SIZE 1 /* Total SPD memory size */
#define SPD_MEMORY_TYPE 2 /* (Fundamental) memory type */
#define SPD_NUM_ROWS 3 /* Number of row address bits */
#define SPD_NUM_COLUMNS 4 /* Number of column address bits */
#define SPD_NUM_DIMM_BANKS 5 /* Number of module rows (banks) */
#define SPD_MODULE_DATA_WIDTH_LSB 6 /* Module data width (LSB) */
#define SPD_MODULE_DATA_WIDTH_MSB 7 /* Module data width (MSB) */
#define SPD_MODULE_VOLTAGE 8 /* Module interface signal levels */
#define SPD_MIN_CYCLE_TIME_AT_CAS_MAX 9 /* SDRAM cycle time (highest CAS latency), RAS access time (tRAC) */
#define SPD_ACCESS_TIME_FROM_CLOCK 10 /* SDRAM access time from clock (highest CAS latency), CAS access time (Tac, tCAC) */
#define SPD_DIMM_CONFIG_TYPE 11 /* Module configuration type */
#define SPD_REFRESH 12 /* Refresh rate/type */
#define SPD_PRIMARY_SDRAM_WIDTH 13 /* SDRAM width (primary SDRAM) */
#define SPD_ERROR_CHECKING_SDRAM_WIDTH 14 /* Error checking SDRAM (data) width */
#define SPD_MIN_CLOCK_DELAY_B2B_RAND_COLUMN 15 /* SDRAM device attributes, minimum clock delay for back to back random column */
#define SPD_SUPPORTED_BURST_LENGTHS 16 /* SDRAM device attributes, burst lengths supported */
#define SPD_NUM_BANKS_PER_SDRAM 17 /* SDRAM device attributes, number of banks on SDRAM device */
#define SPD_ACCEPTABLE_CAS_LATENCIES 18 /* SDRAM device attributes, CAS latency */
#define SPD_CS_LATENCY 19 /* SDRAM device attributes, CS latency */
#define SPD_WE_LATENCY 20 /* SDRAM device attributes, WE latency */
#define SPD_MODULE_ATTRIBUTES 21 /* SDRAM module attributes */
#define SPD_DEVICE_ATTRIBUTES_GENERAL 22 /* SDRAM device attributes, general */
#define SPD_SDRAM_CYCLE_TIME_2ND 23 /* SDRAM cycle time (2nd highest CAS latency) */
#define SPD_ACCESS_TIME_FROM_CLOCK_2ND 24 /* SDRAM access from clock (2nd highest CAS latency) */
#define SPD_SDRAM_CYCLE_TIME_3RD 25 /* SDRAM cycle time (3rd highest CAS latency) */
#define SPD_ACCESS_TIME_FROM_CLOCK_3RD 26 /* SDRAM access from clock (3rd highest CAS latency) */
#define SPD_MIN_ROW_PRECHARGE_TIME 27 /* Minimum row precharge time (Trp) */
#define SPD_MIN_ROWACTIVE_TO_ROWACTIVE 28 /* Minimum row active to row active (Trrd) */
#define SPD_MIN_RAS_TO_CAS_DELAY 29 /* Minimum RAS to CAS delay (Trcd) */
#define SPD_MIN_ACTIVE_TO_PRECHARGE_DELAY 30 /* Minimum RAS pulse width (Tras) */
#define SPD_DENSITY_OF_EACH_ROW_ON_MODULE 31 /* Density of each row on module */
#define SPD_CMD_SIGNAL_INPUT_SETUP_TIME 32 /* Command and address signal input setup time */
#define SPD_CMD_SIGNAL_INPUT_HOLD_TIME 33 /* Command and address signal input hold time */
#define SPD_DATA_SIGNAL_INPUT_SETUP_TIME 34 /* Data signal input setup time */
#define SPD_DATA_SIGNAL_INPUT_HOLD_TIME 35 /* Data signal input hold time */
#define SPD_SPD_DATA_REVISION_CODE 62 /* SPD data revision code */
#define SPD_CHECKSUM_FOR_BYTES_0_TO_62 63 /* Checksum for bytes 0-62 */
#define SPD_MANUFACTURER_JEDEC_ID_CODE 64 /* Manufacturer's JEDEC ID code, per EIA/JEP106 (bytes 64-71) */
#define SPD_MANUFACTURING_LOCATION 72 /* Manufacturing location */
#define SPD_MANUFACTURER_PART_NUMBER 73 /* Manufacturer's part number, in 6-bit ASCII (bytes 73-90) */
#define SPD_REVISION_CODE 91 /* Revision code (bytes 91-92) */
#define SPD_MANUFACTURING_DATE 93 /* Manufacturing date (byte 93: year, byte 94: week) */
#define SPD_ASSEMBLY_SERIAL_NUMBER 95 /* Assembly serial number (bytes 95-98) */
#define SPD_MANUFACTURER_SPECIFIC_DATA 99 /* Manufacturer specific data (bytes 99-125) */
#define SPD_INTEL_SPEC_FOR_FREQUENCY 126 /* Intel specification for frequency */
#define SPD_INTEL_SPEC_100_MHZ 127 /* Intel specification details for 100MHz support */
/* DRAM specifications use the following naming conventions for SPD locations */
#define SPD_tRP SPD_MIN_ROW_PRECHARGE_TIME
#define SPD_tRRD SPD_MIN_ROWACTIVE_TO_ROWACTIVE
#define SPD_tRCD SPD_MIN_RAS_TO_CAS_DELAY
#define SPD_tRAS SPD_MIN_ACTIVE_TO_PRECHARGE_DELAY
#define SPD_BANK_DENSITY SPD_DENSITY_OF_EACH_ROW_ON_MODULE
#define SPD_ADDRESS_CMD_HOLD SPD_CMD_SIGNAL_INPUT_HOLD_TIME
#define SPD_tRC 41 /* SDRAM Device Minimum Active to Active/Auto Refresh Time (tRC) */
#define SPD_tRFC 42 /* SDRAM Device Minimum Auto Refresh to Active/Auto Refresh (tRFC) */
/* SPD_MEMORY_TYPE values. */
#define SPD_MEMORY_TYPE_FPM_DRAM 1
#define SPD_MEMORY_TYPE_EDO 2
#define SPD_MEMORY_TYPE_PIPELINED_NIBBLE 3
#define SPD_MEMORY_TYPE_SDRAM 4
#define SPD_MEMORY_TYPE_MULTIPLEXED_ROM 5
#define SPD_MEMORY_TYPE_SGRAM_DDR 6
#define SPD_MEMORY_TYPE_SDRAM_DDR 7
#define SPD_MEMORY_TYPE_SDRAM_DDR2 8
#define SPD_MEMORY_TYPE_SDRAM_DDR3 0xb
/* SPD_MODULE_VOLTAGE values. */
#define SPD_VOLTAGE_TTL 0 /* 5.0 Volt/TTL */
#define SPD_VOLTAGE_LVTTL 1 /* LVTTL */
#define SPD_VOLTAGE_HSTL 2 /* HSTL 1.5 */
#define SPD_VOLTAGE_SSTL3 3 /* SSTL 3.3 */
#define SPD_VOLTAGE_SSTL2 4 /* SSTL 2.5 */
/* SPD_DIMM_CONFIG_TYPE values. */
#define ERROR_SCHEME_NONE 0
#define ERROR_SCHEME_PARITY 1
#define ERROR_SCHEME_ECC 2
/* SPD_ACCEPTABLE_CAS_LATENCIES values. */
// TODO: Check values.
#define SPD_CAS_LATENCY_1_0 0x01
#define SPD_CAS_LATENCY_1_5 0x02
#define SPD_CAS_LATENCY_2_0 0x04
#define SPD_CAS_LATENCY_2_5 0x08
#define SPD_CAS_LATENCY_3_0 0x10
#define SPD_CAS_LATENCY_3_5 0x20
#define SPD_CAS_LATENCY_4_0 0x40
/* SPD_SUPPORTED_BURST_LENGTHS values. */
#define SPD_BURST_LENGTH_1 1
#define SPD_BURST_LENGTH_2 2
#define SPD_BURST_LENGTH_4 4
#define SPD_BURST_LENGTH_8 8
#define SPD_BURST_LENGTH_PAGE (1 << 7)
/* SPD_MODULE_ATTRIBUTES values. */
#define MODULE_BUFFERED 1
#define MODULE_REGISTERED 2
#endif /* _SPD_H_ */
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