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zephyr/include/drivers/espi.h
Flavio Ceolin d62dd0737e drivers: espi: Change syscall APIs to pass structs by reference 
Several functions that are syscalls were passing structs by value
instead of by reference. Just changed that and implemented missing
verfication handlers for them.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
2020-04-17 10:33:02 -07:00

923 lines
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/*
* Copyright (c) 2019 Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Public APIs for eSPI driver
*/
#ifndef ZEPHYR_INCLUDE_ESPI_H_
#define ZEPHYR_INCLUDE_ESPI_H_
#include <sys/__assert.h>
#include <zephyr/types.h>
#include <device.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief eSPI Driver APIs
* @defgroup espi_interface ESPI Driver APIs
* @ingroup io_interfaces
* @{
*/
/**
* @brief eSPI I/O mode capabilities
*/
enum espi_io_mode {
ESPI_IO_MODE_SINGLE_LINE = BIT(0),
ESPI_IO_MODE_DUAL_LINES = BIT(1),
ESPI_IO_MODE_QUAD_LINES = BIT(2),
};
/**
*+----------------------------------------------------------------------+
*| |
*| eSPI host +-------------+ |
*| +-----------+ | Power | +----------+ |
*| |Out of band| | management | | GPIO | |
*| +------------+ |processor | | controller | | sources | |
*| | SPI flash | +-----------+ +-------------+ +----------+ |
*| | controller | | | | |
*| +------------+ | | | |
*| | | | +--------+ +---------------+ |
*| | | | | | |
*| | | +-----+ +--------+ +----------+ +----v-----+ |
*| | | | | LPC | | Tunneled | | Tunneled | |
*| | | | | bridge | | SMBus | | GPIO | |
*| | | | +--------+ +----------+ +----------+ |
*| | | | | | | |
*| | | | ------+ | | |
*| | | | | | | |
*| | | +------v-----+ +---v-------v-------------v----+ |
*| | | | eSPI Flash | | eSPI protocol block | |
*| | | | access +--->+ | |
*| | | +------------+ +------------------------------+ |
*| | | | |
*| | +-----------+ | |
*| | v v |
*| | XXXXXXXXXXXXXXXXXXXXXXX |
*| | XXXXXXXXXXXXXXXXXXXXX |
*| | XXXXXXXXXXXXXXXXXXX |
*+----------------------------------------------------------------------+
* | |
* v +-----------------+
* +---------+ | | | | | |
* | Flash | | | | | | |
* +---------+ | + + + + | eSPI bus
* | CH0 CH1 CH2 CH3 | (logical channels)
* | + + + + |
* | | | | | |
* +-----------------+
* |
*+-----------------------------------------------------------------------+
*| eSPI slave |
*| |
*| CH0 | CH1 | CH2 | CH3 |
*| eSPI endpoint | VWIRE | OOB | Flash |
*+-----------------------------------------------------------------------+
*
*/
/**
* @brief eSPI channel.
*
* Identifies each eSPI logical channel supported by eSPI controller
* Each channel allows independent traffic, but the assignment of channel
* type to channel number is fixed.
*
* Note that generic commands are not associated with any channel, so traffic
* over eSPI can occur if all channels are disabled or not ready
*/
enum espi_channel {
ESPI_CHANNEL_PERIPHERAL = BIT(0),
ESPI_CHANNEL_VWIRE = BIT(1),
ESPI_CHANNEL_OOB = BIT(2),
ESPI_CHANNEL_FLASH = BIT(3),
};
/**
* @brief eSPI bus event.
*
* eSPI bus event to indicate events for which user can register callbacks
*/
enum espi_bus_event {
ESPI_BUS_RESET = BIT(0),
ESPI_BUS_EVENT_CHANNEL_READY = BIT(1),
ESPI_BUS_EVENT_VWIRE_RECEIVED = BIT(2),
ESPI_BUS_EVENT_OOB_RECEIVED = BIT(3),
ESPI_BUS_PERIPHERAL_NOTIFICATION = BIT(4),
};
/**
* @cond INTERNAL_HIDDEN
*
*/
#define ESPI_PERIPHERAL_INDEX_0 0ul
#define ESPI_PERIPHERAL_INDEX_1 1ul
#define ESPI_PERIPHERAL_INDEX_2 2ul
#define ESPI_SLAVE_TO_MASTER 0ul
#define ESPI_MASTER_TO_SLAVE 1ul
#define ESPI_VWIRE_SRC_ID0 0ul
#define ESPI_VWIRE_SRC_ID1 1ul
#define ESPI_VWIRE_SRC_ID2 2ul
#define ESPI_VWIRE_SRC_ID3 3ul
#define ESPI_VWIRE_SRC_ID_MAX 4ul
#define ESPI_PERIPHERAL_NODATA 0ul
#define E8042_START_OPCODE 0x50
#define E8042_MAX_OPCODE 0x5F
/** @endcond */
/**
* @brief eSPI peripheral notification type.
*
* eSPI peripheral notification event details to indicate which peripheral
* trigger the eSPI callback
*/
enum espi_virtual_peripheral {
ESPI_PERIPHERAL_UART,
ESPI_PERIPHERAL_8042_KBC,
ESPI_PERIPHERAL_HOST_IO,
ESPI_PERIPHERAL_DEBUG_PORT80
};
/**
* @brief eSPI cycle types supported over eSPI peripheral channel
*/
enum espi_cycle_type {
ESPI_CYCLE_MEMORY_READ32,
ESPI_CYCLE_MEMORY_READ64,
ESPI_CYCLE_MEMORY_WRITE32,
ESPI_CYCLE_MEMORY_WRITE64,
ESPI_CYCLE_MESSAGE_NODATA,
ESPI_CYCLE_MESSAGE_DATA,
ESPI_CYCLE_OK_COMPLETION_NODATA,
ESPI_CYCLE_OKCOMPLETION_DATA,
ESPI_CYCLE_NOK_COMPLETION_NODATA,
};
/**
* @brief eSPI system platform signals that can be send or receive through
* virtual wire channel
*/
enum espi_vwire_signal {
/* Virtual wires that can only be send from master to slave */
ESPI_VWIRE_SIGNAL_SLP_S3,
ESPI_VWIRE_SIGNAL_SLP_S4,
ESPI_VWIRE_SIGNAL_SLP_S5,
ESPI_VWIRE_SIGNAL_OOB_RST_WARN,
ESPI_VWIRE_SIGNAL_PLTRST,
ESPI_VWIRE_SIGNAL_SUS_STAT,
ESPI_VWIRE_SIGNAL_NMIOUT,
ESPI_VWIRE_SIGNAL_SMIOUT,
ESPI_VWIRE_SIGNAL_HOST_RST_WARN,
ESPI_VWIRE_SIGNAL_SLP_A,
ESPI_VWIRE_SIGNAL_SUS_PWRDN_ACK,
ESPI_VWIRE_SIGNAL_SUS_WARN,
ESPI_VWIRE_SIGNAL_SLP_WLAN,
ESPI_VWIRE_SIGNAL_SLP_LAN,
ESPI_VWIRE_SIGNAL_HOST_C10,
ESPI_VWIRE_SIGNAL_DNX_WARN,
/* Virtual wires that can only be send from slave to master */
ESPI_VWIRE_SIGNAL_PME,
ESPI_VWIRE_SIGNAL_WAKE,
ESPI_VWIRE_SIGNAL_OOB_RST_ACK,
ESPI_VWIRE_SIGNAL_SLV_BOOT_STS,
ESPI_VWIRE_SIGNAL_ERR_NON_FATAL,
ESPI_VWIRE_SIGNAL_ERR_FATAL,
ESPI_VWIRE_SIGNAL_SLV_BOOT_DONE,
ESPI_VWIRE_SIGNAL_HOST_RST_ACK,
ESPI_VWIRE_SIGNAL_RST_CPU_INIT,
/* System management interrupt */
ESPI_VWIRE_SIGNAL_SMI,
/* System control interrupt */
ESPI_VWIRE_SIGNAL_SCI,
ESPI_VWIRE_SIGNAL_DNX_ACK,
ESPI_VWIRE_SIGNAL_SUS_ACK,
};
/* eSPI LPC peripherals. */
enum lpc_peripheral_opcode {
/* Read transactions */
E8042_OBF_HAS_CHAR = 0x50,
E8042_IBF_HAS_CHAR,
/* Write transactions */
E8042_WRITE_KB_CHAR,
E8042_WRITE_MB_CHAR,
/* Write transactions without input parameters */
E8042_RESUME_IRQ,
E8042_PAUSE_IRQ,
E8042_CLEAR_OBF,
};
/**
* @brief eSPI event
*/
struct espi_event {
/** Event type */
enum espi_bus_event evt_type;
/** Additional details for bus event type */
u32_t evt_details;
/** Data associated to the event */
u32_t evt_data;
};
/**
* @brief eSPI bus configuration parameters
*/
struct espi_cfg {
/** Supported I/O mode */
enum espi_io_mode io_caps;
/** Supported channels */
enum espi_channel channel_caps;
/** Maximum supported frequency in MHz */
u8_t max_freq;
};
/**
* @brief eSPI peripheral request packet format
*/
struct espi_request_packet {
enum espi_cycle_type cycle_type;
u8_t tag;
u16_t len;
u32_t address;
u8_t *data;
};
/**
* @brief eSPI out-of-band transaction packet format
*/
struct espi_oob_packet {
u8_t *buf;
u16_t len;
};
/**
* @brief eSPI flash transactions packet format
*/
struct espi_flash_packet {
u8_t *buf;
u32_t flash_addr;
u16_t len;
};
struct espi_callback;
/**
* @typedef espi_callback_handler_t
* @brief Define the application callback handler function signature.
*
* @param dev Device struct for the eSPI device.
* @param cb Original struct espi_callback owning this handler.
* @param espi_evt event details that trigger the callback handler.
*
*/
typedef void (*espi_callback_handler_t) (struct device *dev,
struct espi_callback *cb,
struct espi_event espi_evt);
/**
* @cond INTERNAL_HIDDEN
*
* Used to register a callback in the driver instance callback list.
* As many callbacks as needed can be added as long as each of them
* are unique pointers of struct espi_callback.
* Beware such structure should not be allocated on stack.
*
* Note: To help setting it, see espi_init_callback() below
*/
struct espi_callback {
/** This is meant to be used in the driver only */
sys_snode_t node;
/** Actual callback function being called when relevant */
espi_callback_handler_t handler;
/** An event which user is interested in, if 0 the callback
* will never be called. Such evt_mask can be modified whenever
* necessary by the owner, and thus will affect the handler being
* called or not.
*/
enum espi_bus_event evt_type;
};
/** @endcond */
/**
* @cond INTERNAL_HIDDEN
*
* eSPI driver API definition and system call entry points
*
* (Internal use only.)
*/
typedef int (*espi_api_config)(struct device *dev, struct espi_cfg *cfg);
typedef bool (*espi_api_get_channel_status)(struct device *dev,
enum espi_channel ch);
/* Logical Channel 0 APIs */
typedef int (*espi_api_read_request)(struct device *dev,
struct espi_request_packet *req);
typedef int (*espi_api_write_request)(struct device *dev,
struct espi_request_packet *req);
typedef int (*espi_api_lpc_read_request)(struct device *dev,
enum lpc_peripheral_opcode op, u32_t *data);
typedef int (*espi_api_lpc_write_request)(struct device *dev,
enum lpc_peripheral_opcode op, u32_t *data);
/* Logical Channel 1 APIs */
typedef int (*espi_api_send_vwire)(struct device *dev,
enum espi_vwire_signal vw,
u8_t level);
typedef int (*espi_api_receive_vwire)(struct device *dev,
enum espi_vwire_signal vw,
u8_t *level);
/* Logical Channel 2 APIs */
typedef int (*espi_api_send_oob)(struct device *dev,
struct espi_oob_packet *pckt);
typedef int (*espi_api_receive_oob)(struct device *dev,
struct espi_oob_packet *pckt);
/* Logical Channel 3 APIs */
typedef int (*espi_api_flash_read)(struct device *dev,
struct espi_flash_packet *pckt);
typedef int (*espi_api_flash_write)(struct device *dev,
struct espi_flash_packet *pckt);
typedef int (*espi_api_flash_erase)(struct device *dev,
struct espi_flash_packet *pckt);
/* Callbacks and traffic intercept */
typedef int (*espi_api_manage_callback)(struct device *dev,
struct espi_callback *callback,
bool set);
__subsystem struct espi_driver_api {
espi_api_config config;
espi_api_get_channel_status get_channel_status;
espi_api_read_request read_request;
espi_api_write_request write_request;
espi_api_lpc_read_request read_lpc_request;
espi_api_lpc_write_request write_lpc_request;
espi_api_send_vwire send_vwire;
espi_api_receive_vwire receive_vwire;
espi_api_send_oob send_oob;
espi_api_receive_oob receive_oob;
espi_api_flash_read flash_read;
espi_api_flash_write flash_write;
espi_api_flash_erase flash_erase;
espi_api_manage_callback manage_callback;
};
/**
* @endcond
*/
/**
* @brief Configure operation of a eSPI controller.
*
* This routine provides a generic interface to override eSPI controller
* capabilities.
*
* If this eSPI controller is acting as slave, the values set here
* will be discovered as part through the GET_CONFIGURATION command
* issued by the eSPI master during initialization.
*
* If this eSPI controller is acting as master, the values set here
* will be used by eSPI master to determine minimum common capabilities with
* eSPI slave then send via SET_CONFIGURATION command.
*
* +--------+ +---------+ +------+ +---------+ +---------+
* | eSPI | | eSPI | | eSPI | | eSPI | | eSPI |
* | slave | | driver | | bus | | driver | | host |
* +--------+ +---------+ +------+ +---------+ +---------+
* | | | | |
* | espi_config | Set eSPI | Set eSPI | espi_config |
* +--------------+ ctrl regs | cap ctrl reg| +-----------+
* | +-------+ | +--------+ |
* | |<------+ | +------->| |
* | | | | |
* | | | | |
* | | | GET_CONFIGURATION | |
* | | +<------------------+ |
* | |<-----------| | |
* | | eSPI caps | | |
* | |----------->+ response | |
* | | |------------------>+ |
* | | | | |
* | | | SET_CONFIGURATION | |
* | | +<------------------+ |
* | | | accept | |
* | | +------------------>+ |
* + + + + +
*
* @param dev Pointer to the device structure for the driver instance.
* @param cfg the device runtime configuration for the eSPI controller.
*
* @retval 0 If successful.
* @retval -EIO General input / output error, failed to configure device.
* @retval -EINVAL invalid capabilities, failed to configure device.
* @retval -ENOTSUP capability not supported by eSPI slave.
*/
__syscall int espi_config(struct device *dev, struct espi_cfg *cfg);
static inline int z_impl_espi_config(struct device *dev,
struct espi_cfg *cfg)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
return api->config(dev, cfg);
}
/**
* @brief Query to see if it a channel is ready.
*
* This routine allows to check if logical channel is ready before use.
* Note that queries for channels not supported will always return false.
*
* @param dev Pointer to the device structure for the driver instance.
* @param ch the eSPI channel for which status is to be retrieved.
*
* @retval true If eSPI channel is ready.
* @retval false otherwise.
*/
__syscall bool espi_get_channel_status(struct device *dev,
enum espi_channel ch);
static inline bool z_impl_espi_get_channel_status(struct device *dev,
enum espi_channel ch)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
return api->get_channel_status(dev, ch);
}
/**
* @brief Sends memory, I/O or message read request over eSPI.
*
* This routines provides a generic interface to send a read request packet.
*
* @param dev Pointer to the device structure for the driver instance.
* @param req Address of structure representing a memory,
* I/O or message read request.
*
* @retval 0 If successful.
* @retval -ENOTSUP if eSPI controller doesn't support raw packets and instead
* low memory transactions are handled by controller hardware directly.
* @retval -EIO General input / output error, failed to send over the bus.
*/
__syscall int espi_read_request(struct device *dev,
struct espi_request_packet *req);
static inline int z_impl_espi_read_request(struct device *dev,
struct espi_request_packet *req)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->read_request) {
return -ENOTSUP;
}
return api->read_request(dev, req);
}
/**
* @brief Sends memory, I/O or message write request over eSPI.
*
* This routines provides a generic interface to send a write request packet.
*
* @param dev Pointer to the device structure for the driver instance.
* @param req Address of structure representing a memory, I/O or
* message write request.
*
* @retval 0 If successful.
* @retval -ENOTSUP if eSPI controller doesn't support raw packets and instead
* low memory transactions are handled by controller hardware directly.
* @retval -EINVAL General input / output error, failed to send over the bus.
*/
__syscall int espi_write_request(struct device *dev,
struct espi_request_packet *req);
static inline int z_impl_espi_write_request(struct device *dev,
struct espi_request_packet *req)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->write_request) {
return -ENOTSUP;
}
return api->write_request(dev, req);
}
/**
* @brief Reads SOC data from a LPC peripheral with information
* updated over eSPI.
*
* This routine provides a generic interface to read a block whose
* information was updated by an eSPI transaction. Reading may trigger
* a transaction. The eSPI packet is assembled by the HW block.
*
* @param dev Pointer to the device structure for the driver instance.
* @param op Enum representing opcode for peripheral type and read request.
* @param data Parameter to be read from to the LPC peripheral.
*
* @retval 0 If successful.
* @retval -ENOTSUP if eSPI peripheral is off or not supported.
* @retval -EINVAL for unimplemented lpc opcode, but in range.
*/
__syscall int espi_read_lpc_request(struct device *dev,
enum lpc_peripheral_opcode op, u32_t *data);
static inline int z_impl_espi_read_lpc_request(struct device *dev,
enum lpc_peripheral_opcode op,
u32_t *data)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->read_lpc_request) {
return -ENOTSUP;
}
return api->read_lpc_request(dev, op, data);
}
/**
* @brief Writes data to a LPC peripheral which generates an eSPI transaction.
*
* This routine provides a generic interface to write data to a block which
* triggers an eSPI transaction. The eSPI packet is assembled by the HW
* block.
*
* @param dev Pointer to the device structure for the driver instance.
* @param op Enum representing an opcode for peripheral type and write request.
* @param data Represents the parameter passed to the LPC peripheral.
*
* @retval 0 If successful.
* @retval -ENOTSUP if eSPI peripheral is off or not supported.
* @retval -EINVAL for unimplemented lpc opcode, but in range.
*/
__syscall int espi_write_lpc_request(struct device *dev,
enum lpc_peripheral_opcode op,
u32_t *data);
static inline int z_impl_espi_write_lpc_request(struct device *dev,
enum lpc_peripheral_opcode op,
u32_t *data)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->write_lpc_request) {
return -ENOTSUP;
}
return api->write_lpc_request(dev, op, data);
}
/**
* @brief Sends system/platform signal as a virtual wire packet.
*
* This routines provides a generic interface to send a virtual wire packet
* from slave to master.
*
* @param dev Pointer to the device structure for the driver instance.
* @param signal The signal to be send to eSPI master.
* @param level The level of signal requested LOW or HIGH.
*
* @retval 0 If successful.
* @retval -EIO General input / output error, failed to send over the bus.
*/
__syscall int espi_send_vwire(struct device *dev,
enum espi_vwire_signal signal,
u8_t level);
static inline int z_impl_espi_send_vwire(struct device *dev,
enum espi_vwire_signal signal,
u8_t level)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
return api->send_vwire(dev, signal, level);
}
/**
* @brief Retrieves level status for a signal encapsulated in a virtual wire.
*
* This routines provides a generic interface to request a virtual wire packet
* from eSPI master and retrieve the signal level.
*
* @param dev Pointer to the device structure for the driver instance.
* @param signal the signal to be requested from eSPI master.
* @param level the level of signal requested 0b LOW, 1b HIGH.
*
* @retval -EIO General input / output error, failed request to master.
*/
__syscall int espi_receive_vwire(struct device *dev,
enum espi_vwire_signal signal,
u8_t *level);
static inline int z_impl_espi_receive_vwire(struct device *dev,
enum espi_vwire_signal signal,
u8_t *level)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
return api->receive_vwire(dev, signal, level);
}
/**
* @brief Sends SMBus transaction (out-of-band) packet over eSPI bus.
*
* This routines provides an interface to encapsulate a SMBus transaction
* and send into packet over eSPI bus
*
* @param dev Pointer to the device structure for the driver instance.
* @param pckt Address of the packet representation of SMBus transaction.
*
* @retval -EIO General input / output error, failed request to master.
*/
__syscall int espi_send_oob(struct device *dev, struct espi_oob_packet *pckt);
static inline int z_impl_espi_send_oob(struct device *dev,
struct espi_oob_packet *pckt)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->send_oob) {
return -ENOTSUP;
}
return api->send_oob(dev, pckt);
}
/**
* @brief Receives SMBus transaction (out-of-band) packet from eSPI bus.
*
* This routines provides an interface to receive and decoded a SMBus
* transaction from eSPI bus
*
* @param dev Pointer to the device structure for the driver instance.
* @param pckt Address of the packet representation of SMBus transaction.
*
* @retval -EIO General input / output error, failed request to master.
*/
__syscall int espi_receive_oob(struct device *dev,
struct espi_oob_packet *pckt);
static inline int z_impl_espi_receive_oob(struct device *dev,
struct espi_oob_packet *pckt)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->receive_oob) {
return -ENOTSUP;
}
return api->receive_oob(dev, pckt);
}
/**
* @brief Sends a read request packet for shared flash.
*
* This routines provides an interface to send a request to read the flash
* component shared between the eSPI master and eSPI slaves.
*
* @param dev Pointer to the device structure for the driver instance.
* @param pckt Adddress of the representation of read flash transaction.
*
* @retval -ENOTSUP eSPI flash logical channel transactions not supported.
* @retval -EBUSY eSPI flash channel is not ready or disabled by master.
* @retval -EIO General input / output error, failed request to master.
*/
__syscall int espi_read_flash(struct device *dev,
struct espi_flash_packet *pckt);
static inline int z_impl_espi_read_flash(struct device *dev,
struct espi_flash_packet *pckt)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->flash_read) {
return -ENOTSUP;
}
return api->flash_read(dev, pckt);
}
/**
* @brief Sends a write request packet for shared flash.
*
* This routines provides an interface to send a request to write to the flash
* components shared between the eSPI master and eSPI slaves.
*
* @param dev Pointer to the device structure for the driver instance.
* @param pckt Address of the representation of write flash transaction.
*
* @retval -ENOTSUP eSPI flash logical channel transactions not supported.
* @retval -EBUSY eSPI flash channel is not ready or disabled by master.
* @retval -EIO General input / output error, failed request to master.
*/
__syscall int espi_write_flash(struct device *dev,
struct espi_flash_packet *pckt);
static inline int z_impl_espi_write_flash(struct device *dev,
struct espi_flash_packet *pckt)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->flash_write) {
return -ENOTSUP;
}
return api->flash_write(dev, pckt);
}
/**
* @brief Sends a write request packet for shared flash.
*
* This routines provides an interface to send a request to write to the flash
* components shared between the eSPI master and eSPI slaves.
*
* @param dev Pointer to the device structure for the driver instance.
* @param pckt Address of the representation of write flash transaction.
*
* @retval -ENOTSUP eSPI flash logical channel transactions not supported.
* @retval -EBUSY eSPI flash channel is not ready or disabled by master.
* @retval -EIO General input / output error, failed request to master.
*/
__syscall int espi_flash_erase(struct device *dev,
struct espi_flash_packet *pckt);
static inline int z_impl_espi_flash_erase(struct device *dev,
struct espi_flash_packet *pckt)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->flash_erase) {
return -ENOTSUP;
}
return api->flash_erase(dev, pckt);
}
/**
* Callback model
*
*+-------+ +-------------+ +------+ +---------+
*| App | | eSPI driver | | HW | |eSPI Host|
*+---+---+ +-------+-----+ +---+--+ +----+----+
* | | | |
* | espi_init_callback | | |
* +----------------------------> | | |
* | espi_add_callback | |
* +----------------------------->+ |
* | | | eSPI reset | eSPI host
* | | IRQ +<------------+ resets the
* | | <-----------+ | bus
* | | | |
* | | Processed | |
* | | within the | |
* | | driver | |
* | | | |
* | | | VW CH ready| eSPI host
* | | IRQ +<------------+ enables VW
* | | <-----------+ | channel
* | | | |
* | | Processed | |
* | | within the | |
* | | driver | |
* | | | |
* | | | Memory I/O | Peripheral
* | | <-------------+ event
* | +<------------+ |
* +<-----------------------------+ callback | |
* | Report peripheral event | | |
* | and data for the event | | |
* | | | |
* | | | SLP_S5 | eSPI host
* | | <-------------+ send VWire
* | +<------------+ |
* +<-----------------------------+ callback | |
* | App enables/configures | | |
* | discrete regulator | | |
* | | | |
* | espi_send_vwire_signal | | |
* +------------------------------>------------>|------------>|
* | | | |
* | | | HOST_RST | eSPI host
* | | <-------------+ send VWire
* | +<------------+ |
* +<-----------------------------+ callback | |
* | App reset host-related | | |
* | data structures | | |
* | | | |
* | | | C10 | eSPI host
* | | +<------------+ send VWire
* | <-------------+ |
* <------------------------------+ | |
* | App executes | | |
* + power mgmt policy | | |
*/
/**
* @brief Helper to initialize a struct espi_callback properly.
*
* @param callback A valid Application's callback structure pointer.
* @param handler A valid handler function pointer.
* @param evt_type indicates the eSPI event relevant for the handler.
* for VWIRE_RECEIVED event the data will indicate the new level asserted
*/
static inline void espi_init_callback(struct espi_callback *callback,
espi_callback_handler_t handler,
enum espi_bus_event evt_type)
{
__ASSERT(callback, "Callback pointer should not be NULL");
__ASSERT(handler, "Callback handler pointer should not be NULL");
callback->handler = handler;
callback->evt_type = evt_type;
}
/**
* @brief Add an application callback.
* @param dev Pointer to the device structure for the driver instance.
* @param callback A valid Application's callback structure pointer.
* @return 0 if successful, negative errno code on failure.
*
* @note Callbacks may be added to the device from within a callback
* handler invocation, but whether they are invoked for the current
* eSPI event is not specified.
*
* Note: enables to add as many callback as needed on the same device.
*/
static inline int espi_add_callback(struct device *dev,
struct espi_callback *callback)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->manage_callback) {
return -ENOTSUP;
}
return api->manage_callback(dev, callback, true);
}
/**
* @brief Remove an application callback.
* @param dev Pointer to the device structure for the driver instance.
* @param callback A valid application's callback structure pointer.
* @return 0 if successful, negative errno code on failure.
*
* @warning It is explicitly permitted, within a callback handler, to
* remove the registration for the callback that is running, i.e. @p
* callback. Attempts to remove other registrations on the same
* device may result in undefined behavior, including failure to
* invoke callbacks that remain registered and unintended invocation
* of removed callbacks.
*
* Note: enables to remove as many callbacks as added through
* espi_add_callback().
*/
static inline int espi_remove_callback(struct device *dev,
struct espi_callback *callback)
{
const struct espi_driver_api *api =
(const struct espi_driver_api *)dev->driver_api;
if (!api->manage_callback) {
return -ENOTSUP;
}
return api->manage_callback(dev, callback, false);
}
#ifdef __cplusplus
}
#endif
/**
* @}
*/
#include <syscalls/espi.h>
#endif /* ZEPHYR_INCLUDE_ESPI_H_ */
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