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
23struct intel_stream {
24	size_t posn_offset;
25};
26
27/* Mailbox-based Intel IPC implementation */
28void 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}
42EXPORT_SYMBOL(intel_ipc_msg_data);
43
44int 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}
63EXPORT_SYMBOL(intel_ipc_pcm_params);
64
65int 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}
78EXPORT_SYMBOL(intel_pcm_open);
79
80int 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}
90EXPORT_SYMBOL(intel_pcm_close);
91
92MODULE_LICENSE("Dual BSD/GPL");