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1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * Copyright 2019 NXP
4 *
5 * Header file for the DSP IPC implementation
6 */
7
8#ifndef _IMX_DSP_IPC_H
9#define _IMX_DSP_IPC_H
10
11#include <linux/device.h>
12#include <linux/types.h>
13#include <linux/mailbox_client.h>
14
15#define DSP_MU_CHAN_NUM 4
16
17struct imx_dsp_chan {
18 struct imx_dsp_ipc *ipc;
19 struct mbox_client cl;
20 struct mbox_chan *ch;
21 char *name;
22 int idx;
23};
24
25struct imx_dsp_ops {
26 void (*handle_reply)(struct imx_dsp_ipc *ipc);
27 void (*handle_request)(struct imx_dsp_ipc *ipc);
28};
29
30struct imx_dsp_ipc {
31 /* Host <-> DSP communication uses 2 txdb and 2 rxdb channels */
32 struct imx_dsp_chan chans[DSP_MU_CHAN_NUM];
33 struct device *dev;
34 struct imx_dsp_ops *ops;
35 void *private_data;
36};
37
38static inline void imx_dsp_set_data(struct imx_dsp_ipc *ipc, void *data)
39{
40 if (!ipc)
41 return;
42
43 ipc->private_data = data;
44}
45
46static inline void *imx_dsp_get_data(struct imx_dsp_ipc *ipc)
47{
48 if (!ipc)
49 return NULL;
50
51 return ipc->private_data;
52}
53
54#if IS_ENABLED(CONFIG_IMX_DSP)
55
56int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx);
57
58struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx);
59void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx);
60
61#else
62
63static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
64 unsigned int chan_idx)
65{
66 return -ENOTSUPP;
67}
68
69struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx)
70{
71 return ERR_PTR(-EOPNOTSUPP);
72}
73
74void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx) { }
75
76#endif
77#endif /* _IMX_DSP_IPC_H */