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/*
* Copyright 2020 Google LLC
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_DRIVERS_ESPI_SPI_EMUL_H_
#define ZEPHYR_INCLUDE_DRIVERS_ESPI_SPI_EMUL_H_
/**
* @file
*
* @brief Public APIs for the eSPI emulation drivers.
*/
#include <zephyr/types.h>
#include <device.h>
/**
* @brief eSPI Emulation Interface
* @defgroup espi_emul_interface eSPI Emulation Interface
* @ingroup io_emulators
* @{
*/
#ifdef __cplusplus
extern "C" {
#endif
#define EMUL_ESPI_HOST_CHIPSEL 0
struct espi_emul;
/**
* Passes eSPI virtual wires set request (virtual wire packet) to the emulator.
* The emulator updates the state (level) of its virtual wire.
*
* @param emul Emulator instance
* @param vw The signal to be set.
* @param level The level of signal requested LOW(0) or HIGH(1).
*
* @retval 0 If successful.
* @retval -EIO General input / output error.
*/
typedef int (*emul_espi_api_set_vw)(struct espi_emul *emul,
enum espi_vwire_signal vw,
uint8_t level);
/**
* Passes eSPI virtual wires get request (virtual wire packet) to the emulator.
* The emulator returns the state (level) of its virtual wire.
*
* @param emul Emulator instance
* @param vw The signal to be get.
* @param level The level of the signal to be get.
*
* @retval 0 If successful.
* @retval -EIO General input / output error.
*/
typedef int (*emul_espi_api_get_vw)(struct espi_emul *emul,
enum espi_vwire_signal vw,
uint8_t *level);
/**
* 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.
*
* @param dev eSPI emulation controller device
* @param chipsel Chip-select value
* @return emulator to use
* @return NULL if not found
*/
typedef struct espi_emul *(*emul_find_emul)(const struct device *dev,
unsigned int chipsel);
/**
* Triggers an event on the emulator of eSPI controller side which causes
* calling specific callbacks.
*
* @param dev Device instance of emulated eSPI controller
* @param evt Event to be triggered
*
* @retval 0 If successful.
* @retval -EIO General input / output error.
*/
typedef int (*emul_trigger_event)(const struct device *dev,
struct espi_event *evt);
/** Definition of the eSPI device emulator API */
struct emul_espi_device_api {
emul_espi_api_set_vw set_vw;
emul_espi_api_get_vw get_vw;
};
/** Node in a linked list of emulators for eSPI devices */
struct espi_emul {
sys_snode_t node;
/* API provided for this device */
const struct emul_espi_device_api *api;
/* eSPI chip-select of the emulated device */
uint16_t chipsel;
};
/** Definition of the eSPI controller emulator API */
struct emul_espi_driver_api {
/* The struct espi_driver_api has to be first in
* struct emul_espi_driver_api to make pointer casting working
*/
struct espi_driver_api espi_api;
/* The rest, emulator specific functions */
emul_trigger_event trigger_event;
emul_find_emul find_emul;
};
/**
* Register an emulated device on the controller
*
* @param dev Device that will use the emulator
* @param name User-friendly name for this emulator
* @param emul eSPI emulator to use
* @return 0 indicating success (always)
*/
int espi_emul_register(const struct device *dev, const char *name,
struct espi_emul *emul);
/**
* Sets the eSPI virtual wire on the host side, which will
* trigger a proper event(and callbacks) on the emulated eSPI controller
*
* @param espi_dev eSPI emulation controller device
* @param vw The signal to be set.
* @param level The level of the signal to be set.
*
* @retval 0 If successful.
* @retval -EIO General input / output error.
*/
int emul_espi_host_send_vw(const struct device *espi_dev,
enum espi_vwire_signal vw, uint8_t level);
/**
* Perform port80 write on the emulated host side, which will
* trigger a proper event(and callbacks) on the emulated eSPI controller
*
* @param espi_dev eSPI emulation controller device
* @param data The date to be written.
*
* @retval 0 If successful.
* @retval -EIO General input / output error.
*/
int emul_espi_host_port80_write(const struct device *espi_dev, uint32_t data);
#ifdef __cplusplus
}
#endif
/**
* @}
*/
#endif /* ZEPHYR_INCLUDE_DRIVERS_ESPI_SPI_EMUL_H_ */