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

group peci_interface

PECI Interface 3.0.

Defines

PECI_CC_RSP_SUCCESS: PECI read/write supported responses

PECI_CC_RSP_TIMEOUT

PECI_CC_OUT_OF_RESOURCES_TIMEOUT

PECI_CC_RESOURCES_LOWPWR_TIMEOUT

PECI_CC_ILLEGAL_REQUEST

PECI_PING_WR_LEN: Ping command format.

PECI_PING_RD_LEN

PECI_PING_LEN

PECI_GET_DIB_WR_LEN: GetDIB command format.

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

PECI_GET_TEMP_WR_LEN: GetTemp command format.

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

PECI_RD_PKG_WR_LEN: RdPkgConfig command format.

PECI_RD_PKG_LEN_BYTE

PECI_RD_PKG_LEN_WORD

PECI_RD_PKG_LEN_DWORD

PECI_RD_PKG_CMD_LEN

PECI_WR_PKG_RD_LEN: WrPkgConfig command format

PECI_WR_PKG_LEN_BYTE

PECI_WR_PKG_LEN_WORD

PECI_WR_PKG_LEN_DWORD

PECI_WR_PKG_CMD_LEN

PECI_RD_IAMSR_WR_LEN: RdIAMSR command format

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

PECI_WR_IAMSR_RD_LEN: WrIAMSR command format

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

PECI_RD_PCICFG_WR_LEN: RdPCIConfig command format

PECI_RD_PCICFG_LEN_BYTE

PECI_RD_PCICFG_LEN_WORD

PECI_RD_PCICFG_LEN_DWORD

PECI_RD_PCICFG_CMD_LEN

PECI_WR_PCICFG_RD_LEN: WrPCIConfig command format

PECI_WR_PCICFG_LEN_BYTE

PECI_WR_PCICFG_LEN_WORD

PECI_WR_PCICFG_LEN_DWORD

PECI_WR_PCICFG_CMD_LEN

PECI_RD_PCICFGL_WR_LEN: RdPCIConfigLocal command format

PECI_RD_PCICFGL_RD_LEN_BYTE

PECI_RD_PCICFGL_RD_LEN_WORD

PECI_RD_PCICFGL_RD_LEN_DWORD

PECI_RD_PCICFGL_CMD_LEN

PECI_WR_PCICFGL_RD_LEN: WrPCIConfigLocal command format

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 expressed in Kbps. command or when an event needs to be sent to the client application.

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.

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

Param buf: is a valid pointer on a data buffer, or NULL otherwise.
Param len: is the length of the data buffer expected to received without considering the frame check sequence byte.

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