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_ipc_pcm_params(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream,const struct sof_ipc_pcm_params_reply * reply)48 int sof_ipc_pcm_params(struct snd_sof_dev *sdev,
49 struct snd_pcm_substream *substream,
50 const struct sof_ipc_pcm_params_reply *reply)
51 {
52 struct sof_stream *stream = substream->runtime->private_data;
53 size_t posn_offset = reply->posn_offset;
54
55 /* check if offset is overflow or it is not aligned */
56 if (posn_offset > sdev->stream_box.size ||
57 posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
58 return -EINVAL;
59
60 stream->posn_offset = sdev->stream_box.offset + posn_offset;
61
62 dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
63 substream->stream, stream->posn_offset);
64
65 return 0;
66 }
67 EXPORT_SYMBOL(sof_ipc_pcm_params);
68
sof_stream_pcm_open(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream)69 int sof_stream_pcm_open(struct snd_sof_dev *sdev,
70 struct snd_pcm_substream *substream)
71 {
72 struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
73
74 if (!stream)
75 return -ENOMEM;
76
77 /* binding pcm substream to hda stream */
78 substream->runtime->private_data = stream;
79
80 /* align to DMA minimum transfer size */
81 snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
82
83 /* avoid circular buffer wrap in middle of period */
84 snd_pcm_hw_constraint_integer(substream->runtime,
85 SNDRV_PCM_HW_PARAM_PERIODS);
86
87 return 0;
88 }
89 EXPORT_SYMBOL(sof_stream_pcm_open);
90
sof_stream_pcm_close(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream)91 int sof_stream_pcm_close(struct snd_sof_dev *sdev,
92 struct snd_pcm_substream *substream)
93 {
94 struct sof_stream *stream = substream->runtime->private_data;
95
96 substream->runtime->private_data = NULL;
97 kfree(stream);
98
99 return 0;
100 }
101 EXPORT_SYMBOL(sof_stream_pcm_close);
102
103 MODULE_LICENSE("Dual BSD/GPL");
104