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
23 struct sof_stream {
24 size_t posn_offset;
25 };
26
27 /* Mailbox-based Generic IPC implementation */
sof_ipc_msg_data(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream,void * p,size_t sz)28 int 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 }
46 EXPORT_SYMBOL(sof_ipc_msg_data);
47
sof_set_stream_data_offset(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream,size_t posn_offset)48 int 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 }
66 EXPORT_SYMBOL(sof_set_stream_data_offset);
67
sof_stream_pcm_open(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream)68 int 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 }
88 EXPORT_SYMBOL(sof_stream_pcm_open);
89
sof_stream_pcm_close(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream)90 int 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 }
100 EXPORT_SYMBOL(sof_stream_pcm_close);
101
102 MODULE_LICENSE("Dual BSD/GPL");
103