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
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
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