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 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