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
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, offset: sdev->dsp_box.offset, dest: p, bytes: 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, offset: posn_offset, dest: p, bytes: sz);
57 }
58
59 return 0;
60}
61EXPORT_SYMBOL(sof_ipc_msg_data);
62
63int 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}
93EXPORT_SYMBOL(sof_set_stream_data_offset);
94
95int sof_stream_pcm_open(struct snd_sof_dev *sdev,
96 struct snd_pcm_substream *substream)
97{
98 struct sof_stream *stream = kmalloc(size: 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(runtime: substream->runtime, cond: 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, step: 4);
108
109 /* avoid circular buffer wrap in middle of period */
110 snd_pcm_hw_constraint_integer(runtime: substream->runtime,
111 SNDRV_PCM_HW_PARAM_PERIODS);
112
113 return 0;
114}
115EXPORT_SYMBOL(sof_stream_pcm_open);
116
117int 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(objp: stream);
124
125 return 0;
126}
127EXPORT_SYMBOL(sof_stream_pcm_close);
128
129MODULE_LICENSE("Dual BSD/GPL");
130

source code of linux/sound/soc/sof/stream-ipc.c