xref: /openbmc/linux/sound/soc/sof/stream-ipc.c (revision f4356947)
1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2 //
3 // This file is provided under a dual BSD/GPLv2 license.  When using or
4 // redistributing this file, you may do so under either license.
5 //
6 // Copyright(c) 2019 Intel Corporation. All rights reserved.
7 //
8 // Authors: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
9 
10 /* Generic SOF IPC code */
11 
12 #include <linux/device.h>
13 #include <linux/export.h>
14 #include <linux/module.h>
15 #include <linux/types.h>
16 
17 #include <sound/pcm.h>
18 #include <sound/sof/stream.h>
19 
20 #include "ops.h"
21 #include "sof-priv.h"
22 #include "sof-audio.h"
23 
24 struct sof_stream {
25 	size_t posn_offset;
26 };
27 
28 /* Mailbox-based Generic IPC implementation */
29 int sof_ipc_msg_data(struct snd_sof_dev *sdev,
30 		     struct snd_sof_pcm_stream *sps,
31 		     void *p, size_t sz)
32 {
33 	if (!sps || !sdev->stream_box.size) {
34 		snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
35 	} else {
36 		size_t posn_offset;
37 
38 		if (sps->substream) {
39 			struct sof_stream *stream = sps->substream->runtime->private_data;
40 
41 			/* The stream might already be closed */
42 			if (!stream)
43 				return -ESTRPIPE;
44 
45 			posn_offset = stream->posn_offset;
46 		} else {
47 
48 			struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;
49 
50 			if (!sstream)
51 				return -ESTRPIPE;
52 
53 			posn_offset = sstream->posn_offset;
54 		}
55 
56 		snd_sof_dsp_mailbox_read(sdev, posn_offset, p, sz);
57 	}
58 
59 	return 0;
60 }
61 EXPORT_SYMBOL(sof_ipc_msg_data);
62 
63 int sof_set_stream_data_offset(struct snd_sof_dev *sdev,
64 			       struct snd_sof_pcm_stream *sps,
65 			       size_t posn_offset)
66 {
67 	/* check if offset is overflow or it is not aligned */
68 	if (posn_offset > sdev->stream_box.size ||
69 	    posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
70 		return -EINVAL;
71 
72 	posn_offset += sdev->stream_box.offset;
73 
74 	if (sps->substream) {
75 		struct sof_stream *stream = sps->substream->runtime->private_data;
76 
77 		stream->posn_offset = posn_offset;
78 		dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
79 			sps->substream->stream, posn_offset);
80 	} else if (sps->cstream) {
81 		struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;
82 
83 		sstream->posn_offset = posn_offset;
84 		dev_dbg(sdev->dev, "compr: stream dir %d, posn mailbox offset is %zu",
85 			sps->cstream->direction, posn_offset);
86 	} else {
87 		dev_err(sdev->dev, "No stream opened");
88 		return -EINVAL;
89 	}
90 
91 	return 0;
92 }
93 EXPORT_SYMBOL(sof_set_stream_data_offset);
94 
95 int sof_stream_pcm_open(struct snd_sof_dev *sdev,
96 			struct snd_pcm_substream *substream)
97 {
98 	struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
99 
100 	if (!stream)
101 		return -ENOMEM;
102 
103 	/* binding pcm substream to hda stream */
104 	substream->runtime->private_data = stream;
105 
106 	/* align to DMA minimum transfer size */
107 	snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
108 
109 	/* avoid circular buffer wrap in middle of period */
110 	snd_pcm_hw_constraint_integer(substream->runtime,
111 				      SNDRV_PCM_HW_PARAM_PERIODS);
112 
113 	return 0;
114 }
115 EXPORT_SYMBOL(sof_stream_pcm_open);
116 
117 int sof_stream_pcm_close(struct snd_sof_dev *sdev,
118 			 struct snd_pcm_substream *substream)
119 {
120 	struct sof_stream *stream = substream->runtime->private_data;
121 
122 	substream->runtime->private_data = NULL;
123 	kfree(stream);
124 
125 	return 0;
126 }
127 EXPORT_SYMBOL(sof_stream_pcm_close);
128 
129 MODULE_LICENSE("Dual BSD/GPL");
130