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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 or4// redistributing this file, you may do so under either license.5//6// Copyright(c) 2019 Intel Corporation7//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 24struct sof_stream {25 size_t posn_offset;26};27 28/* Mailbox-based Generic IPC implementation */29int 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}61EXPORT_SYMBOL(sof_ipc_msg_data);62 63int 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}93EXPORT_SYMBOL(sof_set_stream_data_offset);94 95int 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}115EXPORT_SYMBOL(sof_stream_pcm_open);116 117int 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}127EXPORT_SYMBOL(sof_stream_pcm_close);128