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
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
imx_dsp_set_data(struct imx_dsp_ipc * ipc,void * data)38 static 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
imx_dsp_get_data(struct imx_dsp_ipc * ipc)46 static 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
56 int imx_dsp_ring_doorbell(struct imx_dsp_ipc *dsp, unsigned int chan_idx);
57
58 struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx);
59 void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx);
60
61 #else
62
imx_dsp_ring_doorbell(struct imx_dsp_ipc * ipc,unsigned int chan_idx)63 static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
64 unsigned int chan_idx)
65 {
66 return -ENOTSUPP;
67 }
68
imx_dsp_request_channel(struct imx_dsp_ipc * ipc,int idx)69 struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx)
70 {
71 return ERR_PTR(-EOPNOTSUPP);
72 }
73
imx_dsp_free_channel(struct imx_dsp_ipc * ipc,int idx)74 void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx) { }
75
76 #endif
77 #endif /* _IMX_DSP_IPC_H */
78