LXR linux/sound/soc/sof/intel/intel-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/* 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_NS(intel_ipc_msg_data, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
  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_NS(intel_ipc_pcm_params, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
  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        /* align to DMA minimum transfer size */
  77        snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
  78
  79        /* avoid circular buffer wrap in middle of period */
  80        snd_pcm_hw_constraint_integer(substream->runtime,
  81                                      SNDRV_PCM_HW_PARAM_PERIODS);
  82
  83        return 0;
  84}
  85EXPORT_SYMBOL_NS(intel_pcm_open, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
  86
  87int intel_pcm_close(struct snd_sof_dev *sdev,
  88                    struct snd_pcm_substream *substream)
  89{
  90        struct intel_stream *stream = substream->runtime->private_data;
  91
  92        substream->runtime->private_data = NULL;
  93        kfree(stream);
  94
  95        return 0;
  96}
  97EXPORT_SYMBOL_NS(intel_pcm_close, SND_SOC_SOF_INTEL_HIFI_EP_IPC);
  98
  99MODULE_LICENSE("Dual BSD/GPL");
 100