linux/include/linux/firmware/imx/dsp.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright 2019 NXP
 *
 * Header file for the DSP IPC implementation
 */

#ifndef _IMX_DSP_IPC_H
#define _IMX_DSP_IPC_H

#include <linux/device.h>
#include <linux/types.h>
#include <linux/mailbox_client.h>

#define DSP_MU_CHAN_NUM …

struct imx_dsp_chan { … };

struct imx_dsp_ops { … };

struct imx_dsp_ipc { … };

static inline void imx_dsp_set_data(struct imx_dsp_ipc *ipc, void *data)
{ … }

static inline void *imx_dsp_get_data(struct imx_dsp_ipc *ipc)
{ … }

#if IS_ENABLED(CONFIG_IMX_DSP)

int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx);

struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx);
void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx);

#else

static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
					unsigned int chan_idx)
{
	return -ENOTSUPP;
}

struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx)
{
	return ERR_PTR(-EOPNOTSUPP);
}

void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx) { }

#endif
#endif /* _IMX_DSP_IPC_H */