[alsa-devel] [PATCH 12/21] ASoC: SOF: Intel: Add Intel specific HDA trace operations

[Pierre-Louis Bossart]

From: Liam Girdwood <liam.r.girdwood at linux.intel.com>

Add trace operations for Intel based HDA DSPs

Signed-off-by: Keyon Jie <yang.jie at linux.intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/sof/intel/hda-trace.c | 79 +++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 sound/soc/sof/intel/hda-trace.c

diff --git a/sound/soc/sof/intel/hda-trace.c b/sound/soc/sof/intel/hda-trace.c
new file mode 100644
index 000000000000..5e9f73f09544
--- /dev/null
+++ b/sound/soc/sof/intel/hda-trace.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: (GPL-2.0 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) 2018 Intel Corporation. All rights reserved.
+//
+// Authors: Liam Girdwood <liam.r.girdwood at linux.intel.com>
+//	    Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
+//	    Rander Wang <rander.wang at intel.com>
+//          Keyon Jie <yang.jie at linux.intel.com>
+//
+
+/*
+ * Hardware interface for generic Intel audio DSP HDA IP
+ */
+
+#include <sound/hdaudio_ext.h>
+#include "../ops.h"
+#include "hda.h"
+
+static int hda_dsp_trace_prepare(struct snd_sof_dev *sdev)
+{
+	struct hdac_ext_stream *stream = sdev->hda->dtrace_stream;
+	struct hdac_stream *hstream = &stream->hstream;
+	struct snd_dma_buffer *dmab = &sdev->dmatb;
+	int ret;
+
+	hstream->period_bytes = 0;/* initialize period_bytes */
+	hstream->bufsize = sdev->dmatb.bytes;
+
+	ret = hda_dsp_stream_hw_params(sdev, stream, dmab, NULL);
+	if (ret < 0)
+		dev_err(sdev->dev, "error: hdac prepare failed: %x\n", ret);
+
+	return ret;
+}
+
+int hda_dsp_trace_init(struct snd_sof_dev *sdev, u32 *tag)
+{
+	sdev->hda->dtrace_stream = hda_dsp_stream_get(sdev,
+						      SNDRV_PCM_STREAM_CAPTURE);
+
+	if (!sdev->hda->dtrace_stream) {
+		dev_err(sdev->dev,
+			"error: no available capture stream for DMA trace\n");
+		return -ENODEV;
+	}
+
+	*tag = sdev->hda->dtrace_stream->hstream.stream_tag;
+
+	/*
+	 * initialize capture stream, set BDL address and return corresponding
+	 * stream tag which will be sent to the firmware by IPC message.
+	 */
+	return hda_dsp_trace_prepare(sdev);
+}
+
+int hda_dsp_trace_release(struct snd_sof_dev *sdev)
+{
+	struct hdac_stream *hstream;
+
+	if (sdev->hda->dtrace_stream) {
+		hstream = &sdev->hda->dtrace_stream->hstream;
+		hda_dsp_stream_put(sdev,
+				   SNDRV_PCM_STREAM_CAPTURE,
+				   hstream->stream_tag);
+		sdev->hda->dtrace_stream = NULL;
+		return 0;
+	}
+
+	dev_dbg(sdev->dev, "DMA trace stream is not opened!\n");
+	return -ENODEV;
+}
+
+int hda_dsp_trace_trigger(struct snd_sof_dev *sdev, int cmd)
+{
+	return hda_dsp_stream_trigger(sdev, sdev->hda->dtrace_stream, cmd);
+}
-- 
2.17.1