shmem.h

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/*
 * Copyright 2024,2026 NXP
 *
 * SPDX-License-Identifier: Apache-2.0
 */

 
#ifndef _INCLUDE_ZEPHYR_DRIVERS_FIRMWARE_SCMI_SHMEM_H_
#define _INCLUDE_ZEPHYR_DRIVERS_FIRMWARE_SCMI_SHMEM_H_
 
#include <zephyr/device.h>
#include <zephyr/arch/cpu.h>
#include <errno.h>



#define SCMI_SHMEM_CHAN_STATUS_BUSY_BIT BIT(0)

#define SCMI_SHMEM_CHAN_FLAG_IRQ_BIT BIT(0)

struct scmi_shmem_layout {
        volatile uint32_t res0;
        volatile uint32_t chan_status;
        volatile uint32_t res1[2];
        volatile uint32_t chan_flags;
        volatile uint32_t len;
        volatile uint32_t msg_hdr;
};

 
struct scmi_message;

int scmi_shmem_write_message(const struct device *shmem,
                             struct scmi_message *msg,
                             bool use_polling);

int scmi_shmem_read_hdr(const struct device *shmem, uint32_t *hdr);

int scmi_shmem_read_message(const struct device *shmem,
                            struct scmi_message *msg);

void scmi_shmem_update_flags(const struct device *shmem,
                             uint32_t mask, uint32_t val);

uint32_t scmi_shmem_channel_status(const struct device *shmem);

int scmi_shmem_vendor_write_message(struct scmi_shmem_layout *layout);

int scmi_shmem_vendor_read_message(const struct scmi_shmem_layout *layout);

void scmi_shmem_mark_channel_free(const struct device *dev);

 
#endif /* _INCLUDE_ZEPHYR_DRIVERS_FIRMWARE_SCMI_SHMEM_H_ */