sound/soc/sof/stream-ipc.c

   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
  24 struct sof_stream {
  25         size_t posn_offset;
  26 };
  27
  28 /* Mailbox-based Generic IPC implementation */
  29 int 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 }
  61 EXPORT_SYMBOL(sof_ipc_msg_data);
  62
  63 int 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 }
  93 EXPORT_SYMBOL(sof_set_stream_data_offset);
  94
  95 int 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 }
 115 EXPORT_SYMBOL(sof_stream_pcm_open);
 116
 117 int 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 }
 127 EXPORT_SYMBOL(sof_stream_pcm_close);
 128
 129 MODULE_LICENSE("Dual BSD/GPL");