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/*
* System Control and Management Interface (SCMI) Message Protocol
* driver common header file containing some definitions, structures
* and function prototypes used in all the different SCMI protocols.
*
* Copyright (C) 2017 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/completion.h>
#include <linux/scmi_protocol.h>
#include <linux/types.h>
/**
* struct scmi_msg_hdr - Message(Tx/Rx) header
*
* @id: The identifier of the command being sent
* @protocol_id: The identifier of the protocol used to send @id command
* @seq: The token to identify the message. when a message/command returns,
* the platform returns the whole message header unmodified including
* the token.
*/
struct scmi_msg_hdr {
u8 id;
u8 protocol_id;
u16 seq;
u32 status;
bool poll_completion;
};
/**
* struct scmi_msg - Message(Tx/Rx) structure
*
* @buf: Buffer pointer
* @len: Length of data in the Buffer
*/
struct scmi_msg {
void *buf;
size_t len;
};
/**
* struct scmi_xfer - Structure representing a message flow
*
* @hdr: Transmit message header
* @tx: Transmit message
* @rx: Receive message, the buffer should be pre-allocated to store
* message. If request-ACK protocol is used, we can reuse the same
* buffer for the rx path as we use for the tx path.
* @done: completion event
*/
struct scmi_xfer {
struct scmi_msg_hdr hdr;
struct scmi_msg tx;
struct scmi_msg rx;
struct completion done;
};
void scmi_one_xfer_put(const struct scmi_handle *h, struct scmi_xfer *xfer);
int scmi_do_xfer(const struct scmi_handle *h, struct scmi_xfer *xfer);
int scmi_one_xfer_init(const struct scmi_handle *h, u8 msg_id, u8 prot_id,
size_t tx_size, size_t rx_size, struct scmi_xfer **p);
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