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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Ruslan Bukin <br@bsdpad.com>
* Copyright (c) 2023 Arm Ltd
*
* This work was supported by Innovate UK project 105694, "Digital Security
* by Design (DSbD) Technology Platform Prototype".
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _ARM64_SCMI_SCMI_SHMEM_H_
#define _ARM64_SCMI_SCMI_SHMEM_H_
/* Shared Memory Transfer. */
struct scmi_smt_header {
uint32_t reserved;
uint32_t channel_status;
#define SCMI_SHMEM_CHAN_STAT_CHANNEL_ERROR (1 << 1)
#define SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE (1 << 0)
uint32_t reserved1[2];
uint32_t flags;
#define SCMI_SHMEM_FLAG_INTR_ENABLED (1 << 0)
uint32_t length;
uint32_t msg_header;
uint8_t msg_payload[0];
};
#define SMT_SIZE_HEADER sizeof(struct scmi_smt_header)
#define SMT_OFFSET_CHAN_STATUS \
__offsetof(struct scmi_smt_header, channel_status)
#define SMT_SIZE_CHAN_STATUS sizeof(uint32_t)
#define SMT_OFFSET_LENGTH \
__offsetof(struct scmi_smt_header, length)
#define SMT_SIZE_LENGTH sizeof(uint32_t)
#define SMT_OFFSET_MSG_HEADER \
__offsetof(struct scmi_smt_header, msg_header)
#define SMT_SIZE_MSG_HEADER sizeof(uint32_t)
device_t scmi_shmem_get(device_t sdev, phandle_t node, int index);
int scmi_shmem_prepare_msg(device_t dev, uint8_t *msg, uint32_t tx_len,
bool polling);
bool scmi_shmem_poll_msg(device_t dev, uint32_t *msg_header, uint32_t *rx_len);
int scmi_shmem_read_msg_header(device_t dev, uint32_t *msg_header, uint32_t *rx_len);
int scmi_shmem_read_msg_payload(device_t dev, uint8_t *buf, uint32_t buf_len, uint32_t rx_len);
void scmi_shmem_tx_complete(device_t);
void scmi_shmem_clear_channel(device_t);
#endif /* !_ARM64_SCMI_SCMI_SHMEM_H_ */
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