1 // SPDX-License-Identifier: (GPL-2.0 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 /* Intel-specific 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 intel_stream {
24 size_t posn_offset;
25 };
26
27 /* Mailbox-based Intel IPC implementation */
intel_ipc_msg_data(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream,void * p,size_t sz)28 void intel_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 sof_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
34 } else {
35 struct intel_stream *stream = substream->runtime->private_data;
36
37 /* The stream might already be closed */
38 if (stream)
39 sof_mailbox_read(sdev, stream->posn_offset, p, sz);
40 }
41 }
42 EXPORT_SYMBOL(intel_ipc_msg_data);
43
intel_ipc_pcm_params(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream,const struct sof_ipc_pcm_params_reply * reply)44 int intel_ipc_pcm_params(struct snd_sof_dev *sdev,
45 struct snd_pcm_substream *substream,
46 const struct sof_ipc_pcm_params_reply *reply)
47 {
48 struct intel_stream *stream = substream->runtime->private_data;
49 size_t posn_offset = reply->posn_offset;
50
51 /* check if offset is overflow or it is not aligned */
52 if (posn_offset > sdev->stream_box.size ||
53 posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
54 return -EINVAL;
55
56 stream->posn_offset = sdev->stream_box.offset + posn_offset;
57
58 dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
59 substream->stream, stream->posn_offset);
60
61 return 0;
62 }
63 EXPORT_SYMBOL(intel_ipc_pcm_params);
64
intel_pcm_open(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream)65 int intel_pcm_open(struct snd_sof_dev *sdev,
66 struct snd_pcm_substream *substream)
67 {
68 struct intel_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
69
70 if (!stream)
71 return -ENOMEM;
72
73 /* binding pcm substream to hda stream */
74 substream->runtime->private_data = stream;
75
76 return 0;
77 }
78 EXPORT_SYMBOL(intel_pcm_open);
79
intel_pcm_close(struct snd_sof_dev * sdev,struct snd_pcm_substream * substream)80 int intel_pcm_close(struct snd_sof_dev *sdev,
81 struct snd_pcm_substream *substream)
82 {
83 struct intel_stream *stream = substream->runtime->private_data;
84
85 substream->runtime->private_data = NULL;
86 kfree(stream);
87
88 return 0;
89 }
90 EXPORT_SYMBOL(intel_pcm_close);
91
92 MODULE_LICENSE("Dual BSD/GPL");
93
