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 if (sps->cstream) { 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 } else { 56 dev_err(sdev->dev, "%s: No stream opened\n", __func__); 57 return -EINVAL; 58 } 59 60 snd_sof_dsp_mailbox_read(sdev, posn_offset, p, sz); 61 } 62 63 return 0; 64 } 65 EXPORT_SYMBOL(sof_ipc_msg_data); 66 67 int sof_set_stream_data_offset(struct snd_sof_dev *sdev, 68 struct snd_sof_pcm_stream *sps, 69 size_t posn_offset) 70 { 71 /* check if offset is overflow or it is not aligned */ 72 if (posn_offset > sdev->stream_box.size || 73 posn_offset % sizeof(struct sof_ipc_stream_posn) != 0) 74 return -EINVAL; 75 76 posn_offset += sdev->stream_box.offset; 77 78 if (sps->substream) { 79 struct sof_stream *stream = sps->substream->runtime->private_data; 80 81 stream->posn_offset = posn_offset; 82 dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu", 83 sps->substream->stream, posn_offset); 84 } else if (sps->cstream) { 85 struct sof_compr_stream *sstream = sps->cstream->runtime->private_data; 86 87 sstream->posn_offset = posn_offset; 88 dev_dbg(sdev->dev, "compr: stream dir %d, posn mailbox offset is %zu", 89 sps->cstream->direction, posn_offset); 90 } else { 91 dev_err(sdev->dev, "No stream opened"); 92 return -EINVAL; 93 } 94 95 return 0; 96 } 97 EXPORT_SYMBOL(sof_set_stream_data_offset); 98 99 int sof_stream_pcm_open(struct snd_sof_dev *sdev, 100 struct snd_pcm_substream *substream) 101 { 102 struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL); 103 104 if (!stream) 105 return -ENOMEM; 106 107 /* binding pcm substream to hda stream */ 108 substream->runtime->private_data = stream; 109 110 /* align to DMA minimum transfer size */ 111 snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4); 112 113 /* avoid circular buffer wrap in middle of period */ 114 snd_pcm_hw_constraint_integer(substream->runtime, 115 SNDRV_PCM_HW_PARAM_PERIODS); 116 117 return 0; 118 } 119 EXPORT_SYMBOL(sof_stream_pcm_open); 120 121 int sof_stream_pcm_close(struct snd_sof_dev *sdev, 122 struct snd_pcm_substream *substream) 123 { 124 struct sof_stream *stream = substream->runtime->private_data; 125 126 substream->runtime->private_data = NULL; 127 kfree(stream); 128 129 return 0; 130 } 131 EXPORT_SYMBOL(sof_stream_pcm_close); 132