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/* 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 4
struct imx_dsp_chan {
struct imx_dsp_ipc *ipc;
struct mbox_client cl;
struct mbox_chan *ch;
char *name;
int idx;
struct imx_dsp_ops {
void (*handle_reply)(struct imx_dsp_ipc *ipc);
void (*handle_request)(struct imx_dsp_ipc *ipc);
struct imx_dsp_ipc {
/* Host <-> DSP communication uses 2 txdb and 2 rxdb channels */
struct imx_dsp_chan chans[DSP_MU_CHAN_NUM];
struct device *dev;
struct imx_dsp_ops *ops;
void *private_data;
static inline void imx_dsp_set_data(struct imx_dsp_ipc *ipc, void *data)
if (!ipc)
ipc->private_data = data;
static inline void *imx_dsp_get_data(struct imx_dsp_ipc *ipc)
if (!ipc)
return NULL;
return ipc->private_data;
int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx);
static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
unsigned int chan_idx)
return -ENOTSUPP;
#endif /* _IMX_DSP_IPC_H */