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 ipc->private_data = data;
41 }
42
imx_dsp_get_data(struct imx_dsp_ipc * ipc)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
imx_dsp_ring_doorbell(struct imx_dsp_ipc * ipc,unsigned int chan_idx)57 static inline int imx_dsp_ring_doorbell(struct imx_dsp_ipc *ipc,
58 unsigned int chan_idx)
59 {
60 return -ENOTSUPP;
61 }
62
imx_dsp_request_channel(struct imx_dsp_ipc * ipc,int idx)63 struct mbox_chan *imx_dsp_request_channel(struct imx_dsp_ipc *ipc, int idx)
64 {
65 return ERR_PTR(-EOPNOTSUPP);
66 }
67
imx_dsp_free_channel(struct imx_dsp_ipc * ipc,int idx)68 void imx_dsp_free_channel(struct imx_dsp_ipc *ipc, int idx) { }
69
70 #endif
71 #endif /* _IMX_DSP_IPC_H */
72
