ddr4.c File Reference

#include <console/console.h>
#include <cbmem.h>
#include <device/device.h>
#include <device/dram/ddr4.h>
#include <string.h>
#include <memory_info.h>
#include <smbios.h>
#include <types.h>

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Data Structures
struct	ddr4_speed_attr
struct	spd_block

Enumerations
enum	ddr4_speed_grade {   DDR4_1600 , DDR4_1866 , DDR4_2133 , DDR4_2400 ,   DDR4_2666 , DDR4_2933 , DDR4_3200 }
enum	spd_block_type {   BLOCK_0 , BLOCK_1 , BLOCK_1_L , BLOCK_1_H ,   BLOCK_2 , BLOCK_2_L , BLOCK_2_H , BLOCK_3 }

Functions
static bool	verify_block (const spd_block *block, spd_raw_data spd)
static bool	block_exists (spd_block_type type, u8 dimm_type)
uint16_t	ddr4_speed_mhz_to_reported_mts (uint16_t speed_mhz)
	Converts DDR4 clock speed in MHz to the standard reported speed in MT/s. More...
int	spd_decode_ddr4 (struct dimm_attr_ddr4_st *dimm, spd_raw_data spd)
	Decode the raw SPD data. More...
enum cb_err	spd_add_smbios17_ddr4 (const u8 channel, const u8 slot, const u16 selected_freq, const struct dimm_attr_ddr4_st *info)

Variables
static const struct ddr4_speed_attr	ddr4_speeds []
	DDR4 speed attributes derived from JEDEC 79-4C tables 169 & 170. More...
const spd_block	spd_blocks []

Enumeration Type Documentation

ddr4_speed_grade

enum ddr4_speed_grade

Enumerator
DDR4_1600
DDR4_1866
DDR4_2133
DDR4_2400
DDR4_2666
DDR4_2933
DDR4_3200

Definition at line 12 of file ddr4.c.

spd_block_type

enum spd_block_type

Enumerator
BLOCK_0
BLOCK_1
BLOCK_1_L
BLOCK_1_H
BLOCK_2
BLOCK_2_L
BLOCK_2_H
BLOCK_3

Definition at line 75 of file ddr4.c.

Function Documentation

block_exists()

static bool block_exists ( spd_block_type  type, u8  dimm_type  )

static

Definition at line 112 of file ddr4.c.

References BLOCK_0, BLOCK_1, BLOCK_1_H, BLOCK_1_L, BLOCK_2_H, BLOCK_2_L, BLOCK_3, and type.

Referenced by spd_add_smbios17_ddr4().

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ddr4_speed_mhz_to_reported_mts()

uint16_t ddr4_speed_mhz_to_reported_mts

(

uint16_t

speed_mhz

)

Converts DDR4 clock speed in MHz to the standard reported speed in MT/s.

Definition at line 137 of file ddr4.c.

References ARRAY_SIZE, BIOS_ERR, ddr4_speeds, ddr4_speed_attr::max_clock_mhz, ddr4_speed_attr::min_clock_mhz, printk, and ddr4_speed_attr::reported_mts.

Referenced by ddr_speed_mhz_to_reported_mts().

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spd_add_smbios17_ddr4()

enum cb_err spd_add_smbios17_ddr4	(	const u8	channel,
		const u8	slot,
		const u16	selected_freq,
		const struct dimm_attr_ddr4_st *	info
	)

Definition at line 166 of file ddr4.c.

References ARRAY_SIZE, BIOS_ERR, BIOS_WARNING, block_exists(), dimm_attr_ddr4_st::bus_width, dimm_attr_ddr4_st::cap_per_die_mbit, dimm_attr_ddr4_st::dimm_type, dimm_attr_ddr4_st::dram_type, dimm_attr_ddr4_st::manufacturer_id, memcpy(), dimm_attr_ddr4_st::part_number, printk, dimm_attr_ddr4_st::ranks, dimm_attr_ddr4_st::sdram_width, dimm_attr_ddr4_st::serial_number, dimm_attr_ddr4_st::size_mb, spd_blocks, SPD_DDR4_PART_LEN, SPD_MEMORY_TYPE_DDR4_SDRAM, SPD_MEMORY_TYPE_UNDEFINED, SPD_STATUS_CRC_ERROR, SPD_STATUS_INVALID, SPD_STATUS_OK, type, dimm_attr_ddr4_st::vdd_voltage, and verify_block().

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spd_decode_ddr4()

int spd_decode_ddr4	(	struct dimm_attr_ddr4_st *	dimm,
		spd_raw_data	spd
	)

Decode the raw SPD data.

Decodes a raw SPD data from a DDR4 DIMM, and organizes it into a dimm_attr structure. The SPD data must first be read in a contiguous array, and passed to this function.

Parameters

dimm	pointer to dimm_attr structure where the decoded data is to be stored
spd	array of raw data previously read from the SPD.

Returns

spd_status enumerator SPD_STATUS_OK – decoding was successful SPD_STATUS_INVALID – invalid SPD or not a DDR4 SPD SPD_STATUS_CRC_ERROR – checksum mismatch

Definition at line 166 of file ddr4.c.

verify_block()

static bool verify_block ( const spd_block *  block, spd_raw_data  spd  )

static

Definition at line 100 of file ddr4.c.

References spd_block::crc_start, ddr_crc16(), spd_block::len, and spd_block::start.

Referenced by spd_add_smbios17_ddr4().

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Variable Documentation

ddr4_speeds

const struct ddr4_speed_attr ddr4_speeds[]

static

DDR4 speed attributes derived from JEDEC 79-4C tables 169 & 170.

min_clock_mhz = 1000/max_tCk_avg(ns) + 1 Adding 1 to make minimum inclusive max_clock_mhz = 1000/min_tCk_avg(ns) reported_mts = Standard reported DDR4 speed in MT/s May be 1 less than the actual max MT/s

Definition at line 1 of file ddr4.c.

Referenced by ddr4_speed_mhz_to_reported_mts().

spd_blocks

const spd_block spd_blocks[]

Initial value:

= {
        {.type = BLOCK_0, 0, 128, 126},   {.type = BLOCK_1, 128, 128, 126},
        {.type = BLOCK_1_L, 128, 64, 0},  {.type = BLOCK_1_H, 192, 64, 0},
        {.type = BLOCK_2_L, 256, 64, 62}, {.type = BLOCK_2_H, 320, 64, 0},
        {.type = BLOCK_3, 384, 128, 0} }

Definition at line 94 of file ddr4.c.

Referenced by spd_add_smbios17_ddr4().