Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
23struct sof_stream {
24 size_t posn_offset;
25};
26
27/* Mailbox-based Generic IPC implementation */
28int sof_ipc_msg_data(struct snd_sof_dev *sdev,
29 struct snd_pcm_substream *substream,
30 void *p, size_t sz)
31{
32 if (!substream || !sdev->stream_box.size) {
33 snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
34 } else {
35 struct sof_stream *stream = substream->runtime->private_data;
36
37 /* The stream might already be closed */
38 if (!stream)
39 return -ESTRPIPE;
40
41 snd_sof_dsp_mailbox_read(sdev, stream->posn_offset, p, sz);
42 }
43
44 return 0;
45}
46EXPORT_SYMBOL(sof_ipc_msg_data);
47
48int sof_set_stream_data_offset(struct snd_sof_dev *sdev,
49 struct snd_pcm_substream *substream,
50 size_t posn_offset)
51{
52 struct sof_stream *stream = substream->runtime->private_data;
53
54 /* check if offset is overflow or it is not aligned */
55 if (posn_offset > sdev->stream_box.size ||
56 posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
57 return -EINVAL;
58
59 stream->posn_offset = sdev->stream_box.offset + posn_offset;
60
61 dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
62 substream->stream, stream->posn_offset);
63
64 return 0;
65}
66EXPORT_SYMBOL(sof_set_stream_data_offset);
67
68int sof_stream_pcm_open(struct snd_sof_dev *sdev,
69 struct snd_pcm_substream *substream)
70{
71 struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
72
73 if (!stream)
74 return -ENOMEM;
75
76 /* binding pcm substream to hda stream */
77 substream->runtime->private_data = stream;
78
79 /* align to DMA minimum transfer size */
80 snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
81
82 /* avoid circular buffer wrap in middle of period */
83 snd_pcm_hw_constraint_integer(substream->runtime,
84 SNDRV_PCM_HW_PARAM_PERIODS);
85
86 return 0;
87}
88EXPORT_SYMBOL(sof_stream_pcm_open);
89
90int sof_stream_pcm_close(struct snd_sof_dev *sdev,
91 struct snd_pcm_substream *substream)
92{
93 struct sof_stream *stream = substream->runtime->private_data;
94
95 substream->runtime->private_data = NULL;
96 kfree(stream);
97
98 return 0;
99}
100EXPORT_SYMBOL(sof_stream_pcm_close);
101
102MODULE_LICENSE("Dual BSD/GPL");