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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 <[email protected]>
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
24struct sof_stream {
25 size_t posn_offset;
26};
27
28/* Mailbox-based Generic IPC implementation */
29int 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 if (sps->cstream) {
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 } else {
56 dev_err(sdev->dev, "%s: No stream opened\n", __func__);
57 return -EINVAL;
58 }
59
60 snd_sof_dsp_mailbox_read(sdev, posn_offset, p, sz);
61 }
62
63 return 0;
64}
65EXPORT_SYMBOL(sof_ipc_msg_data);
66
67int sof_set_stream_data_offset(struct snd_sof_dev *sdev,
68 struct snd_sof_pcm_stream *sps,
69 size_t posn_offset)
70{
71 /* check if offset is overflow or it is not aligned */
72 if (posn_offset > sdev->stream_box.size ||
73 posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
74 return -EINVAL;
75
76 posn_offset += sdev->stream_box.offset;
77
78 if (sps->substream) {
79 struct sof_stream *stream = sps->substream->runtime->private_data;
80
81 stream->posn_offset = posn_offset;
82 dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
83 sps->substream->stream, posn_offset);
84 } else if (sps->cstream) {
85 struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;
86
87 sstream->posn_offset = posn_offset;
88 dev_dbg(sdev->dev, "compr: stream dir %d, posn mailbox offset is %zu",
89 sps->cstream->direction, posn_offset);
90 } else {
91 dev_err(sdev->dev, "No stream opened");
92 return -EINVAL;
93 }
94
95 return 0;
96}
97EXPORT_SYMBOL(sof_set_stream_data_offset);
98
99int sof_stream_pcm_open(struct snd_sof_dev *sdev,
100 struct snd_pcm_substream *substream)
101{
102 struct sof_stream *stream = kmalloc_obj(*stream);
103
104 if (!stream)
105 return -ENOMEM;
106
107 /* binding pcm substream to hda stream */
108 substream->runtime->private_data = stream;
109
110 /* align to DMA minimum transfer size */
111 snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
112
113 /* avoid circular buffer wrap in middle of period */
114 snd_pcm_hw_constraint_integer(substream->runtime,
115 SNDRV_PCM_HW_PARAM_PERIODS);
116
117 return 0;
118}
119EXPORT_SYMBOL(sof_stream_pcm_open);
120
121int sof_stream_pcm_close(struct snd_sof_dev *sdev,
122 struct snd_pcm_substream *substream)
123{
124 struct sof_stream *stream = substream->runtime->private_data;
125
126 substream->runtime->private_data = NULL;
127 kfree(stream);
128
129 return 0;
130}
131EXPORT_SYMBOL(sof_stream_pcm_close);