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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* 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
* Annex J: Serial Presence Detects for DDR2 SDRAM (Revision 1.3):
* - PDF: http://www.jedec.org/download/search/4_01_02_10R17.pdf
*/
#ifndef _SPD_H_
#define _SPD_H_
/* Byte numbers. */
/* Number of bytes used by module manufacturer */
#define SPD_NUM_MANUFACTURER_BYTES 0
#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 */
/* Number of column address bits */
#define SPD_NUM_COLUMNS 4
/* Number of module rows (banks) */
#define SPD_NUM_DIMM_BANKS 5
#define SPD_MODULE_DATA_WIDTH_LSB 6 /* Module data width (LSB) */
#define SPD_MODULE_DATA_WIDTH_MSB 7 /* Module data width (MSB) */
/* Module interface signal levels */
#define SPD_MODULE_VOLTAGE 8
/* SDRAM cycle time (highest CAS latency), RAS access time (tRAC) */
#define SPD_MIN_CYCLE_TIME_AT_CAS_MAX 9
/* SDRAM access time from clock (highest CAS latency), CAS access time (Tac,
* tCAC)
*/
#define SPD_ACCESS_TIME_FROM_CLOCK 10
#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) */
/* Error checking SDRAM (data) width */
#define SPD_ERROR_CHECKING_SDRAM_WIDTH 14
/* SDRAM device attributes, minimum clock delay for back to back random
* column
*/
#define SPD_MIN_CLOCK_DELAY_B2B_RAND_COLUMN 15
/* SDRAM device attributes, burst lengths supported */
#define SPD_SUPPORTED_BURST_LENGTHS 16
/* SDRAM device attributes, number of banks on SDRAM device */
#define SPD_NUM_BANKS_PER_SDRAM 17
/* SDRAM device attributes, CAS latency */
#define SPD_ACCEPTABLE_CAS_LATENCIES 18
/* SDRAM device attributes, CS latency */
#define SPD_CS_LATENCY 19
/* SDRAM device attributes, WE latency */
#define SPD_WE_LATENCY 20
#define SPD_MODULE_ATTRIBUTES 21 /* SDRAM module attributes */
/* SDRAM device attributes, general */
#define SPD_DEVICE_ATTRIBUTES_GENERAL 22
/* SDRAM cycle time (2nd highest CAS latency) */
#define SPD_SDRAM_CYCLE_TIME_2ND 23
/* SDRAM access from clock (2nd highest CAS latency) */
#define SPD_ACCESS_TIME_FROM_CLOCK_2ND 24
/* SDRAM cycle time (3rd highest CAS latency) */
#define SPD_SDRAM_CYCLE_TIME_3RD 25
/* SDRAM access from clock (3rd highest CAS latency) */
#define SPD_ACCESS_TIME_FROM_CLOCK_3RD 26
/* Minimum row precharge time (Trp) */
#define SPD_MIN_ROW_PRECHARGE_TIME 27
/* Minimum row active to row active (Trrd) */
#define SPD_MIN_ROWACTIVE_TO_ROWACTIVE 28
/* Minimum RAS to CAS delay (Trcd) */
#define SPD_MIN_RAS_TO_CAS_DELAY 29
/* Minimum RAS pulse width (Tras) */
#define SPD_MIN_ACTIVE_TO_PRECHARGE_DELAY 30
/* Density of each row on module */
#define SPD_DENSITY_OF_EACH_ROW_ON_MODULE 31
/* Command and address signal input setup time */
#define SPD_CMD_SIGNAL_INPUT_SETUP_TIME 32
/* Command and address signal input hold time */
#define SPD_CMD_SIGNAL_INPUT_HOLD_TIME 33
/* Data signal input setup time */
#define SPD_DATA_SIGNAL_INPUT_SETUP_TIME 34
#define SPD_DATA_SIGNAL_INPUT_HOLD_TIME 35 /* Data signal input hold time */
#define SPD_WRITE_RECOVERY_TIME 36 /* Write recovery time (tWR) */
/* Internal write to read command delay (tWTR) */
#define SPD_INT_WRITE_TO_READ_DELAY 37
/* Internal read to precharge command delay (tRTP) */
#define SPD_INT_READ_TO_PRECHARGE_DELAY 38
/* Memory analysis probe characteristics */
#define SPD_MEM_ANALYSIS_PROBE_PARAMS 39
/* Extension of byte 41 (tRC) and byte 42 (tRFC) */
#define SPD_BYTE_41_42_EXTENSION 40
/* Minimum active to active auto refresh (tRCmin) */
#define SPD_MIN_ACT_TO_ACT_AUTO_REFRESH 41
/* Minimum auto refresh to active/auto refresh (tRFC) */
#define SPD_MIN_AUTO_REFRESH_TO_ACT 42
/* Maximum device cycle time (tCKmax) */
#define SPD_MAX_DEVICE_CYCLE_TIME 43
/* Maximum skew between DQS and DQ (tDQSQ) */
#define SPD_MAX_DQS_DQ_SKEW 44
/* Maximum read data-hold skew factor (tQHS) */
#define SPD_MAX_READ_DATAHOLD_SKEW 45
#define SPD_PLL_RELOCK_TIME 46 /* PLL relock 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 */
/* Manufacturer's JEDEC ID code, per EIA/JEP106 (bytes 64-71) */
#define SPD_MANUFACTURER_JEDEC_ID_CODE 64
#define SPD_MANUFACTURING_LOCATION 72 /* Manufacturing location */
/* Manufacturer's part number, in 6-bit ASCII (bytes 73-90) */
#define SPD_MANUFACTURER_PART_NUMBER 73
#define SPD_REVISION_CODE 91 /* Revision code (bytes 91-92) */
/* Manufacturing date (byte 93: year, byte 94: week) */
#define SPD_MANUFACTURING_DATE 93
/* Assembly serial number (bytes 95-98) */
#define SPD_ASSEMBLY_SERIAL_NUMBER 95
/* Manufacturer specific data (bytes 99-125) */
#define SPD_MANUFACTURER_SPECIFIC_DATA 99
/* Intel specification for frequency */
#define SPD_INTEL_SPEC_FOR_FREQUENCY 126
/* Intel specification details for 100MHz support */
#define SPD_INTEL_SPEC_100_MHZ 127
/* 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
/* SDRAM Device Minimum Active to Active/Auto Refresh Time (tRC) */
#define SPD_tRC 41
/* SDRAM Device Minimum Auto Refresh to Active/Auto Refresh (tRFC) */
#define SPD_tRFC 42
/* SPD_MEMORY_TYPE values. */
enum spd_memory_type {
SPD_MEMORY_TYPE_UNDEFINED = 0x00,
SPD_MEMORY_TYPE_FPM_DRAM = 0x01,
SPD_MEMORY_TYPE_EDO = 0x02,
SPD_MEMORY_TYPE_PIPELINED_NIBBLE = 0x03,
SPD_MEMORY_TYPE_SDRAM = 0x04,
SPD_MEMORY_TYPE_MULTIPLEXED_ROM = 0x05,
SPD_MEMORY_TYPE_SGRAM_DDR = 0x06,
SPD_MEMORY_TYPE_SDRAM_DDR = 0x07,
SPD_MEMORY_TYPE_SDRAM_DDR2 = 0x08,
SPD_MEMORY_TYPE_FBDIMM_DDR2 = 0x09,
SPD_MEMORY_TYPE_FB_PROBE_DDR2 = 0x0a,
SPD_MEMORY_TYPE_SDRAM_DDR3 = 0x0b,
SPD_MEMORY_TYPE_DDR4_SDRAM = 0x0c,
SPD_MEMORY_TYPE_DDR4E_SDRAM = 0x0e,
SPD_MEMORY_TYPE_LPDDR3_SDRAM = 0x0f,
SPD_MEMORY_TYPE_LPDDR4_SDRAM = 0x10,
};
/* 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 */
#define SPD_VOLTAGE_SSTL1 5 /* SSTL 1.8 */
/* 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
#define SPD_CAS_LATENCY_DDR2_2 (1 << 2)
#define SPD_CAS_LATENCY_DDR2_3 (1 << 3)
#define SPD_CAS_LATENCY_DDR2_4 (1 << 4)
#define SPD_CAS_LATENCY_DDR2_5 (1 << 5)
#define SPD_CAS_LATENCY_DDR2_6 (1 << 6)
#define SPD_CAS_LATENCY_DDR2_7 (1 << 7)
/* 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
/* Byte 3: Module type information */
#define SPD_UNDEFINED 0x00
#define SPD_RDIMM 0x01
#define SPD_UDIMM 0x02
#define SPD_SODIMM 0x04
#define SPD_72B_SO_CDIMM 0x06
#define SPD_72B_SO_RDIMM 0x07
#define SPD_MICRO_DIMM 0x08
#define SPD_MINI_RDIMM 0x10
#define SPD_MINI_UDIMM 0x20
#define SPD_ECC_8BIT (1<<3)
#endif
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