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, 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 {
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, posn_offset, p, 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(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(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
108
109	/* avoid circular buffer wrap in middle of period */
110	snd_pcm_hw_constraint_integer(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(stream);
124
125	return 0;
126}
127EXPORT_SYMBOL(sof_stream_pcm_close);
128
129MODULE_LICENSE("Dual BSD/GPL");
130