| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| /* |
| * JEDEC Standard No. 21-C |
| * Annex L: Serial Presence Detect (SPD) for DDR4 SDRAM Modules |
| */ |
| |
| #ifndef DEVICE_DRAM_DDR4L_H |
| #define DEVICE_DRAM_DDR4L_H |
| |
| /** |
| * @file ddr4.h |
| * |
| * \brief Utilities for decoding DDR4 SPDs |
| */ |
| |
| #include <spd.h> |
| #include <device/dram/common.h> |
| #include <types.h> |
| |
| #define SPD_DDR4_PART_OFF 329 |
| #define SPD_DDR4_PART_LEN 20 |
| |
| /* |
| * Module type (byte 3, bits 3:0) of SPD |
| * This definition is specific to DDR4. DDR2/3 SPDs have a different structure. |
| */ |
| enum spd_dimm_type { |
| SPD_DIMM_TYPE_EXTENDED = 0x0, |
| SPD_DIMM_TYPE_RDIMM = 0x1, |
| SPD_DIMM_TYPE_UDIMM = 0x2, |
| SPD_DIMM_TYPE_SO_DIMM = 0x3, |
| SPD_DIMM_TYPE_LRDIMM = 0x4, |
| SPD_DIMM_TYPE_MINI_RDIMM = 0x5, |
| SPD_DIMM_TYPE_MINI_UDIMM = 0x6, |
| SPD_DIMM_TYPE_72B_SO_RDIMM = 0x8, |
| SPD_DIMM_TYPE_72B_SO_UDIMM = 0x9, |
| SPD_DIMM_TYPE_16B_SO_DIMM = 0xc, |
| SPD_DIMM_TYPE_32B_SO_DIMM = 0xd, |
| /* Masks to bits 3:0 to give the dimm type */ |
| SPD_DIMM_TYPE_MASK = 0xf |
| }; |
| |
| /** |
| * \brief DIMM characteristics |
| * |
| * The characteristics of each DIMM, as presented by the SPD |
| */ |
| typedef struct dimm_attr_st { |
| enum spd_memory_type dram_type; |
| enum spd_dimm_type dimm_type; |
| char part_number[SPD_DDR4_PART_LEN + 1]; |
| u8 serial_number[4]; |
| u8 bus_width; |
| u8 ranks; |
| u8 sdram_width; |
| u16 cap_per_die_mbit; |
| u16 size_mb; |
| u16 manufacturer_id; |
| u16 vdd_voltage; |
| bool ecc_extension; |
| } dimm_attr; |
| |
| typedef u8 spd_raw_data[512]; |
| |
| int spd_decode_ddr4(dimm_attr *dimm, spd_raw_data spd); |
| |
| enum cb_err spd_add_smbios17_ddr4(const u8 channel, const u8 slot, |
| const u16 selected_freq, |
| const dimm_attr *info); |
| |
| #endif /* DEVICE_DRAM_DDR4L_H */ |