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Platform Environment Control Interface (PECI)

Overview

The Platform Environment Control Interface, abbreviated as PECI, is a thermal management standard introduced in 2006 with the Intel Core 2 Duo Microprocessors. The PECI interface allows external devices to read processor temperature, perform processor manageability functions, and manage processor interface tuning and diagnostics. The PECI bus driver APIs enable the interaction between Embedded Microcontrollers and CPUs.

Configuration Options

Related configuration options:

CONFIG_PECI

API Reference

Related code samples

PECI interface: Monitor CPU temperature using PECI.

group peci_interface

PECI Interface 3.0.

Since: 2.1
Version: 1.0.0

PECI read/write supported responses.

PECI_CC_RSP_SUCCESS

PECI_CC_RSP_TIMEOUT

PECI_CC_OUT_OF_RESOURCES_TIMEOUT

PECI_CC_RESOURCES_LOWPWR_TIMEOUT

PECI_CC_ILLEGAL_REQUEST

Ping command format.

PECI_PING_WR_LEN

PECI_PING_RD_LEN

PECI_PING_LEN

GetDIB command format.

PECI_GET_DIB_WR_LEN

PECI_GET_DIB_RD_LEN

PECI_GET_DIB_CMD_LEN

PECI_GET_DIB_DEVINFO

PECI_GET_DIB_REVNUM

PECI_GET_DIB_DOMAIN_BIT_MASK

PECI_GET_DIB_MAJOR_REV_MASK

PECI_GET_DIB_MINOR_REV_MASK

GetTemp command format.

PECI_GET_TEMP_WR_LEN

PECI_GET_TEMP_RD_LEN

PECI_GET_TEMP_CMD_LEN

PECI_GET_TEMP_LSB

PECI_GET_TEMP_MSB

PECI_GET_TEMP_ERR_MSB

PECI_GET_TEMP_ERR_LSB_GENERAL

PECI_GET_TEMP_ERR_LSB_RES

PECI_GET_TEMP_ERR_LSB_TEMP_LO

PECI_GET_TEMP_ERR_LSB_TEMP_HI

RdPkgConfig command format.

PECI_RD_PKG_WR_LEN

PECI_RD_PKG_LEN_BYTE

PECI_RD_PKG_LEN_WORD

PECI_RD_PKG_LEN_DWORD

PECI_RD_PKG_CMD_LEN

WrPkgConfig command format.

PECI_WR_PKG_RD_LEN

PECI_WR_PKG_LEN_BYTE

PECI_WR_PKG_LEN_WORD

PECI_WR_PKG_LEN_DWORD

PECI_WR_PKG_CMD_LEN

RdIAMSR command format.

PECI_RD_IAMSR_WR_LEN

PECI_RD_IAMSR_LEN_BYTE

PECI_RD_IAMSR_LEN_WORD

PECI_RD_IAMSR_LEN_DWORD

PECI_RD_IAMSR_LEN_QWORD

PECI_RD_IAMSR_CMD_LEN

WrIAMSR command format.

PECI_WR_IAMSR_RD_LEN

PECI_WR_IAMSR_LEN_BYTE

PECI_WR_IAMSR_LEN_WORD

PECI_WR_IAMSR_LEN_DWORD

PECI_WR_IAMSR_LEN_QWORD

PECI_WR_IAMSR_CMD_LEN

RdPCIConfig command format.

PECI_RD_PCICFG_WR_LEN

PECI_RD_PCICFG_LEN_BYTE

PECI_RD_PCICFG_LEN_WORD

PECI_RD_PCICFG_LEN_DWORD

PECI_RD_PCICFG_CMD_LEN

WrPCIConfig command format.

PECI_WR_PCICFG_RD_LEN

PECI_WR_PCICFG_LEN_BYTE

PECI_WR_PCICFG_LEN_WORD

PECI_WR_PCICFG_LEN_DWORD

PECI_WR_PCICFG_CMD_LEN

RdPCIConfigLocal command format.

PECI_RD_PCICFGL_WR_LEN

PECI_RD_PCICFGL_RD_LEN_BYTE

PECI_RD_PCICFGL_RD_LEN_WORD

PECI_RD_PCICFGL_RD_LEN_DWORD

PECI_RD_PCICFGL_CMD_LEN

WrPCIConfigLocal command format.

PECI_WR_PCICFGL_RD_LEN

PECI_WR_PCICFGL_WR_LEN_BYTE

PECI_WR_PCICFGL_WR_LEN_WORD

PECI_WR_PCICFGL_WR_LEN_DWORD

PECI_WR_PCICFGL_CMD_LEN

Enums

enum peci_error_code

PECI error codes.

Values:

enumerator PECI_GENERAL_SENSOR_ERROR = 0x8000

enumerator PECI_UNDERFLOW_SENSOR_ERROR = 0x8002

enumerator PECI_OVERFLOW_SENSOR_ERROR = 0x8003

enum peci_command_code

PECI commands.

Values:

enumerator PECI_CMD_PING = 0x00

enumerator PECI_CMD_GET_TEMP0 = 0x01

enumerator PECI_CMD_GET_TEMP1 = 0x02

enumerator PECI_CMD_RD_PCI_CFG0 = 0x61

enumerator PECI_CMD_RD_PCI_CFG1 = 0x62

enumerator PECI_CMD_WR_PCI_CFG0 = 0x65

enumerator PECI_CMD_WR_PCI_CFG1 = 0x66

enumerator PECI_CMD_RD_PKG_CFG0 = 0xA1

enumerator PECI_CMD_RD_PKG_CFG1 = 0xA

enumerator PECI_CMD_WR_PKG_CFG0 = 0xA5

enumerator PECI_CMD_WR_PKG_CFG1 = 0xA6

enumerator PECI_CMD_RD_IAMSR0 = 0xB1

enumerator PECI_CMD_RD_IAMSR1 = 0xB2

enumerator PECI_CMD_WR_IAMSR0 = 0xB5

enumerator PECI_CMD_WR_IAMSR1 = 0xB6

enumerator PECI_CMD_RD_PCI_CFG_LOCAL0 = 0xE1

enumerator PECI_CMD_RD_PCI_CFG_LOCAL1 = 0xE2

enumerator PECI_CMD_WR_PCI_CFG_LOCAL0 = 0xE5

enumerator PECI_CMD_WR_PCI_CFG_LOCAL1 = 0xE6

enumerator PECI_CMD_GET_DIB = 0xF7

Functions

int peci_config(const struct device *dev, uint32_t bitrate)

Configures the PECI interface.

Parameters:

dev – Pointer to the device structure for the driver instance.
bitrate – the selected bitrate expressed in Kbps.

Return values:

0 – If successful.
Negative – errno code if failure.

int peci_enable(const struct device *dev)

Enable PECI interface.

Parameters:

dev – Pointer to the device structure for the driver instance.

Return values:

0 – If successful.
Negative – errno code if failure.

int peci_disable(const struct device *dev)

Disable PECI interface.

Parameters:

dev – Pointer to the device structure for the driver instance.

Return values:

0 – If successful.
Negative – errno code if failure.

int peci_transfer(const struct device *dev, struct peci_msg *msg)

Performs a PECI transaction.

Parameters:

dev – Pointer to the device structure for the driver instance.
msg – Structure representing a PECI transaction.

Return values:

0 – If successful.
Negative – errno code if failure.

struct peci_buf

#include <peci.h>

PECI buffer structure.

Public Members

uint8_t *buf: Valid pointer on a data buffer, or NULL otherwise.

size_t len: Length of the data buffer expected to be received without considering the frame check sequence byte.

Note

Frame check sequence byte is added into rx buffer: need to allocate an additional byte for this in rx buffer.

struct peci_msg

#include <peci.h>

PECI transaction packet format.

Public Members

uint8_t addr: Client address.

enum peci_command_code cmd_code: Command code.

struct peci_buf tx_buffer: Pointer to buffer of write data.

struct peci_buf rx_buffer: Pointer to buffer of read data.

uint8_t flags: PECI msg flags.