/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
|
/*
|
* Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
|
* Copyright (C) 2019-2020, Linaro Limited
|
*
|
* An SCMI agent device represent on communication path from a
|
* device driver to the remote SCMI server which driver sends
|
* messages to and receives response messages from.
|
*/
|
#ifndef SCMI_AGENT_H
|
#define SCMI_AGENT_H
|
|
#include <asm/types.h>
|
|
struct udevice;
|
|
/*
|
* struct scmi_msg - Context of a SCMI message sent and the response received
|
*
|
* @protocol_id: SCMI protocol ID
|
* @message_id: SCMI message ID for a defined protocol ID
|
* @in_msg: Pointer to the message payload sent by the driver
|
* @in_msg_sz: Byte size of the message payload sent
|
* @out_msg: Pointer to buffer to store response message payload
|
* @out_msg_sz: Byte size of the response buffer and response payload
|
*/
|
struct scmi_msg {
|
unsigned int protocol_id;
|
unsigned int message_id;
|
u8 *in_msg;
|
size_t in_msg_sz;
|
u8 *out_msg;
|
size_t out_msg_sz;
|
};
|
|
/* Helper macro to match a message on input/output array references */
|
#define SCMI_MSG_IN(_protocol, _message, _in_array, _out_array) \
|
(struct scmi_msg){ \
|
.protocol_id = (_protocol), \
|
.message_id = (_message), \
|
.in_msg = (uint8_t *)&(_in_array), \
|
.in_msg_sz = sizeof(_in_array), \
|
.out_msg = (uint8_t *)&(_out_array), \
|
.out_msg_sz = sizeof(_out_array), \
|
}
|
|
/**
|
* scmi_send_and_process_msg() - send and process a SCMI message
|
*
|
* Send a message to a SCMI server through a target SCMI agent device.
|
* Caller sets scmi_msg::out_msg_sz to the output message buffer size.
|
* On return, scmi_msg::out_msg_sz stores the response payload size.
|
*
|
* @dev: SCMI agent device
|
* @msg: Message structure reference
|
* @return 0 on success and a negative errno on failure
|
*/
|
int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg);
|
|
/**
|
* scmi_to_linux_errno() - Convert an SCMI error code into a Linux errno code
|
*
|
* @scmi_errno: SCMI error code value
|
* @return 0 for successful status and a negative errno otherwise
|
*/
|
int scmi_to_linux_errno(s32 scmi_errno);
|
|
#endif /* SCMI_H */
|
