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-rw-r--r--sound/soc/sof/stream-ipc.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/sound/soc/sof/stream-ipc.c b/sound/soc/sof/stream-ipc.c
new file mode 100644
index 0000000000..216b454f6b
--- /dev/null
+++ b/sound/soc/sof/stream-ipc.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+//
+// This file is provided under a dual BSD/GPLv2 license. When using or
+// redistributing this file, you may do so under either license.
+//
+// Copyright(c) 2019 Intel Corporation. All rights reserved.
+//
+// Authors: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
+
+/* Generic SOF IPC code */
+
+#include <linux/device.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include <sound/pcm.h>
+#include <sound/sof/stream.h>
+
+#include "ops.h"
+#include "sof-priv.h"
+#include "sof-audio.h"
+
+struct sof_stream {
+ size_t posn_offset;
+};
+
+/* Mailbox-based Generic IPC implementation */
+int sof_ipc_msg_data(struct snd_sof_dev *sdev,
+ struct snd_sof_pcm_stream *sps,
+ void *p, size_t sz)
+{
+ if (!sps || !sdev->stream_box.size) {
+ snd_sof_dsp_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
+ } else {
+ size_t posn_offset;
+
+ if (sps->substream) {
+ struct sof_stream *stream = sps->substream->runtime->private_data;
+
+ /* The stream might already be closed */
+ if (!stream)
+ return -ESTRPIPE;
+
+ posn_offset = stream->posn_offset;
+ } else {
+
+ struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;
+
+ if (!sstream)
+ return -ESTRPIPE;
+
+ posn_offset = sstream->posn_offset;
+ }
+
+ snd_sof_dsp_mailbox_read(sdev, posn_offset, p, sz);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(sof_ipc_msg_data);
+
+int sof_set_stream_data_offset(struct snd_sof_dev *sdev,
+ struct snd_sof_pcm_stream *sps,
+ size_t posn_offset)
+{
+ /* check if offset is overflow or it is not aligned */
+ if (posn_offset > sdev->stream_box.size ||
+ posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
+ return -EINVAL;
+
+ posn_offset += sdev->stream_box.offset;
+
+ if (sps->substream) {
+ struct sof_stream *stream = sps->substream->runtime->private_data;
+
+ stream->posn_offset = posn_offset;
+ dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
+ sps->substream->stream, posn_offset);
+ } else if (sps->cstream) {
+ struct sof_compr_stream *sstream = sps->cstream->runtime->private_data;
+
+ sstream->posn_offset = posn_offset;
+ dev_dbg(sdev->dev, "compr: stream dir %d, posn mailbox offset is %zu",
+ sps->cstream->direction, posn_offset);
+ } else {
+ dev_err(sdev->dev, "No stream opened");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(sof_set_stream_data_offset);
+
+int sof_stream_pcm_open(struct snd_sof_dev *sdev,
+ struct snd_pcm_substream *substream)
+{
+ struct sof_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
+
+ if (!stream)
+ return -ENOMEM;
+
+ /* binding pcm substream to hda stream */
+ substream->runtime->private_data = stream;
+
+ /* align to DMA minimum transfer size */
+ snd_pcm_hw_constraint_step(substream->runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 4);
+
+ /* avoid circular buffer wrap in middle of period */
+ snd_pcm_hw_constraint_integer(substream->runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+
+ return 0;
+}
+EXPORT_SYMBOL(sof_stream_pcm_open);
+
+int sof_stream_pcm_close(struct snd_sof_dev *sdev,
+ struct snd_pcm_substream *substream)
+{
+ struct sof_stream *stream = substream->runtime->private_data;
+
+ substream->runtime->private_data = NULL;
+ kfree(stream);
+
+ return 0;
+}
+EXPORT_SYMBOL(sof_stream_pcm_close);
+
+MODULE_LICENSE("Dual BSD/GPL");