1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
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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 | |
17 | struct 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 | |
25 | struct imx_dsp_ops { |
26 | void (*handle_reply)(struct imx_dsp_ipc *ipc); |
27 | void (*handle_request)(struct imx_dsp_ipc *ipc); |
28 | }; |
29 | |
30 | struct 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 | |
38 | static inline void imx_dsp_set_data(struct imx_dsp_ipc *ipc, void *data) |
39 | { |
40 | ipc->private_data = data; |
41 | } |
42 | |
43 | static inline void *imx_dsp_get_data(struct imx_dsp_ipc *ipc) |
44 | { |
45 | return ipc->private_data; |
46 | } |
47 | |
48 | #if IS_ENABLED(CONFIG_IMX_DSP) |
49 | |
50 | int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx); |
51 | |
52 | struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx); |
53 | void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx); |
54 | |
55 | #else |
56 | |
57 | static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc, |
58 | unsigned int chan_idx) |
59 | { |
60 | return -ENOTSUPP; |
61 | } |
62 | |
63 | struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx) |
64 | { |
65 | return ERR_PTR(-EOPNOTSUPP); |
66 | } |
67 | |
68 | void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx) { } |
69 | |
70 | #endif |
71 | #endif /* _IMX_DSP_IPC_H */ |
72 |