soc/sof/stream-ipc.c

0001 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
0002 //
0003 // This file is provided under a dual BSD/GPLv2 license.  When using or
0004 // redistributing this file, you may do so under either license.
0005 //
0006 // Copyright(c) 2019 Intel Corporation. All rights reserved.
0007 //
0008 // Authors: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
0009
0010 /* Generic SOF IPC code */
0011
0012 #include <linux/device.h>
0013 #include <linux/export.h>
0014 #include <linux/module.h>
0015 #include <linux/types.h>
0016
0017 #include <sound/pcm.h>
0018 #include <sound/sof/stream.h>
0019
0020 #include "ops.h"
0021 #include "sof-priv.h"
0022
0023 struct sof_stream {
0024     size_t posn_offset;
0025 };
0026
0027 /* Mailbox-based Generic IPC implementation */
0028 int sof_ipc_msg_data(struct snd_sof_dev *sdev,
0029              struct snd_pcm_substream *substream,
0030              void *p, size_t sz)
0031 {
0032     if (!substream || !sdev->stream_box.size) {
0033         snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
0034     } else {
0035         struct sof_stream *stream = substream->runtime->private_data;
0036
0037         /* The stream might already be closed */
0038         if (!stream)
0039             return -ESTRPIPE;
0040
0041         snd_sof_dsp_mailbox_read(sdev, stream->posn_offset, p, sz);
0042     }
0043
0044     return 0;
0045 }
0046 EXPORT_SYMBOL(sof_ipc_msg_data);
0047
0048 int sof_set_stream_data_offset(struct snd_sof_dev *sdev,
0049                    struct snd_pcm_substream *substream,
0050                    size_t posn_offset)
0051 {
0052     struct sof_stream *stream = substream->runtime->private_data;
0053
0054     /* check if offset is overflow or it is not aligned */
0055     if (posn_offset > sdev->stream_box.size ||
0056         posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
0057         return -EINVAL;
0058
0059     stream->posn_offset = sdev->stream_box.offset + posn_offset;
0060
0061     dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
0062         substream->stream, stream->posn_offset);
0063
0064     return 0;
0065 }
0066 EXPORT_SYMBOL(sof_set_stream_data_offset);
0067
0068 int sof_stream_pcm_open(struct snd_sof_dev *sdev,
0069             struct snd_pcm_substream *substream)
0070 {
0071     struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
0072
0073     if (!stream)
0074         return -ENOMEM;
0075
0076     /* binding pcm substream to hda stream */
0077     substream->runtime->private_data = stream;
0078
0079     /* align to DMA minimum transfer size */
0080     snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
0081
0082     /* avoid circular buffer wrap in middle of period */
0083     snd_pcm_hw_constraint_integer(substream->runtime,
0084                       SNDRV_PCM_HW_PARAM_PERIODS);
0085
0086     return 0;
0087 }
0088 EXPORT_SYMBOL(sof_stream_pcm_open);
0089
0090 int sof_stream_pcm_close(struct snd_sof_dev *sdev,
0091              struct snd_pcm_substream *substream)
0092 {
0093     struct sof_stream *stream = substream->runtime->private_data;
0094
0095     substream->runtime->private_data = NULL;
0096     kfree(stream);
0097
0098     return 0;
0099 }
0100 EXPORT_SYMBOL(sof_stream_pcm_close);
0101
0102 MODULE_LICENSE("Dual BSD/GPL");