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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license. When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2019 Intel Corporation. All rights reserved.
//
// Authors: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
/* Generic SOF IPC code */
#include <linux/device.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/types.h>
#include <sound/pcm.h>
#include <sound/sof/stream.h>
#include "ops.h"
#include "sof-priv.h"
struct sof_stream {
size_t posn_offset;
};
/* Mailbox-based Generic IPC implementation */
int sof_ipc_msg_data(struct snd_sof_dev *sdev,
struct snd_pcm_substream *substream,
void *p, size_t sz)
{
if (!substream || !sdev->stream_box.size) {
snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
} else {
struct sof_stream *stream = substream->runtime->private_data;
/* The stream might already be closed */
if (!stream)
return -ESTRPIPE;
snd_sof_dsp_mailbox_read(sdev, stream->posn_offset, p, sz);
}
return 0;
}
EXPORT_SYMBOL(sof_ipc_msg_data);
int sof_ipc_pcm_params(struct snd_sof_dev *sdev,
struct snd_pcm_substream *substream,
const struct sof_ipc_pcm_params_reply *reply)
{
struct sof_stream *stream = substream->runtime->private_data;
size_t posn_offset = reply->posn_offset;
/* check if offset is overflow or it is not aligned */
if (posn_offset > sdev->stream_box.size ||
posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
return -EINVAL;
stream->posn_offset = sdev->stream_box.offset + posn_offset;
dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
substream->stream, stream->posn_offset);
return 0;
}
EXPORT_SYMBOL(sof_ipc_pcm_params);
int sof_stream_pcm_open(struct snd_sof_dev *sdev,
struct snd_pcm_substream *substream)
{
struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
if (!stream)
return -ENOMEM;
/* binding pcm substream to hda stream */
substream->runtime->private_data = stream;
/* align to DMA minimum transfer size */
snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
/* avoid circular buffer wrap in middle of period */
snd_pcm_hw_constraint_integer(substream->runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
return 0;
}
EXPORT_SYMBOL(sof_stream_pcm_open);
int sof_stream_pcm_close(struct snd_sof_dev *sdev,
struct snd_pcm_substream *substream)
{
struct sof_stream *stream = substream->runtime->private_data;
substream->runtime->private_data = NULL;
kfree(stream);
return 0;
}
EXPORT_SYMBOL(sof_stream_pcm_close);
MODULE_LICENSE("Dual BSD/GPL");
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