eSPI Emulation Interface

eSPI Emulation Interface More...

Data Structures
struct	emul_espi_device_api
	Definition of the eSPI device emulator API. More...
struct	espi_emul
	Node in a linked list of emulators for eSPI devices. More...
struct	emul_espi_driver_api
	Definition of the eSPI controller emulator API. More...

Macros
#define	EMUL_ESPI_HOST_CHIPSEL   0

Typedefs
typedef int(*	emul_espi_api_set_vw) (const struct emul *target, enum espi_vwire_signal vw, uint8_t level)
	Passes eSPI virtual wires set request (virtual wire packet) to the emulator.
typedef int(*	emul_espi_api_get_vw) (const struct emul *target, enum espi_vwire_signal vw, uint8_t *level)
	Passes eSPI virtual wires get request (virtual wire packet) to the emulator.
typedef struct espi_emul *(*	emul_find_emul) (const struct device *dev, unsigned int chipsel)
	Find an emulator present on a eSPI bus.
typedef int(*	emul_trigger_event) (const struct device *dev, struct espi_event *evt)
	Triggers an event on the emulator of eSPI controller side which causes calling specific callbacks.

Functions
int	espi_emul_register (const struct device *dev, struct espi_emul *emul)
	Register an emulated device on the controller.
int	emul_espi_host_send_vw (const struct device *espi_dev, enum espi_vwire_signal vw, uint8_t level)
	Sets the eSPI virtual wire on the host side, which will trigger a proper event(and callbacks) on the emulated eSPI controller.
int	emul_espi_host_port80_write (const struct device *espi_dev, uint32_t data)
	Perform port80 write on the emulated host side, which will trigger a proper event(and callbacks) on the emulated eSPI controller.

Detailed Description

eSPI Emulation Interface

Macro Definition Documentation

EMUL_ESPI_HOST_CHIPSEL

#define EMUL_ESPI_HOST_CHIPSEL   0

#include <include/zephyr/drivers/espi_emul.h>

Typedef Documentation

emul_espi_api_get_vw

typedef int(* emul_espi_api_get_vw) (const struct emul *target, enum espi_vwire_signal vw, uint8_t *level)

#include <include/zephyr/drivers/espi_emul.h>

Passes eSPI virtual wires get request (virtual wire packet) to the emulator.

The emulator returns the state (level) of its virtual wire.

Parameters

target	The device Emulator instance
vw	The signal to be get.
level	The level of the signal to be get.

Return values

0	If successful.
-EIO	General input / output error.

emul_espi_api_set_vw

typedef int(* emul_espi_api_set_vw) (const struct emul *target, enum espi_vwire_signal vw, uint8_t level)

#include <include/zephyr/drivers/espi_emul.h>

Passes eSPI virtual wires set request (virtual wire packet) to the emulator.

The emulator updates the state (level) of its virtual wire.

Parameters

target	The device Emulator instance
vw	The signal to be set.
level	The level of signal requested LOW(0) or HIGH(1).

Return values

0	If successful.
-EIO	General input / output error.

emul_find_emul

typedef struct espi_emul *(* emul_find_emul) (const struct device *dev, unsigned int chipsel)

#include <include/zephyr/drivers/espi_emul.h>

Find an emulator present on a eSPI bus.

At present the function is used only to find an emulator of the host device. It may be useful in systems with the SPI flash chips.

Parameters

dev	eSPI emulation controller device
chipsel	Chip-select value

Returns

espi_emul to use

NULL if not found

emul_trigger_event

typedef int(* emul_trigger_event) (const struct device *dev, struct espi_event *evt)

#include <include/zephyr/drivers/espi_emul.h>

Triggers an event on the emulator of eSPI controller side which causes calling specific callbacks.

Parameters

dev	Device instance of emulated eSPI controller
evt	Event to be triggered

Return values

0	If successful.
-EIO	General input / output error.

Function Documentation

emul_espi_host_port80_write()

int emul_espi_host_port80_write	(	const struct device *	espi_dev,
		uint32_t	data
	)

#include <include/zephyr/drivers/espi_emul.h>

Perform port80 write on the emulated host side, which will trigger a proper event(and callbacks) on the emulated eSPI controller.

Parameters

espi_dev	eSPI emulation controller device
data	The date to be written.

Return values

0	If successful.
-EIO	General input / output error.

emul_espi_host_send_vw()

int emul_espi_host_send_vw	(	const struct device *	espi_dev,
		enum espi_vwire_signal	vw,
		uint8_t	level
	)

#include <include/zephyr/drivers/espi_emul.h>

Sets the eSPI virtual wire on the host side, which will trigger a proper event(and callbacks) on the emulated eSPI controller.

Parameters

espi_dev	eSPI emulation controller device
vw	The signal to be set.
level	The level of the signal to be set.

Return values

0	If successful.
-EIO	General input / output error.

espi_emul_register()

int espi_emul_register	(	const struct device *	dev,
		struct espi_emul *	emul
	)

#include <include/zephyr/drivers/espi_emul.h>

Register an emulated device on the controller.

Parameters

dev	Device that will use the emulator
emul	eSPI emulator to use

Returns

0 indicating success (always)