sound/soc/sof/amd/acp-pcm.c

Source file repositories/reference/linux-study-clean/sound/soc/sof/amd/acp-pcm.c

File Facts

System
Linux kernel
Corpus path
sound/soc/sof/amd/acp-pcm.c
Extension
.c
Size
3366 bytes
Lines
121
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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) 2021 Advanced Micro Devices, Inc.
//
// Authors: Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>

/*
 * PCM interface for generic AMD audio ACP DSP block
 */
#include <sound/pcm_params.h>

#include "../ops.h"
#include "acp.h"
#include "acp-dsp-offset.h"

int acp_pcm_hw_params(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream,
		      struct snd_pcm_hw_params *params,
		      struct snd_sof_platform_stream_params *platform_params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct acp_dsp_stream *stream = runtime->private_data;
	unsigned int buf_offset, index;
	u32 size;
	int ret;

	size = runtime->dma_bytes;
	stream->num_pages = PFN_UP(runtime->dma_bytes);
	stream->dmab = substream->runtime->dma_buffer_p;

	ret = acp_dsp_stream_config(sdev, stream);
	if (ret < 0) {
		dev_err(sdev->dev, "stream configuration failed\n");
		return ret;
	}

	platform_params->use_phy_address = true;
	platform_params->phy_addr = stream->reg_offset;
	platform_params->stream_tag = stream->stream_tag;
	platform_params->cont_update_posn = 1;

	/* write buffer size of stream in scratch memory */

	buf_offset = sdev->debug_box.offset +
		     offsetof(struct scratch_reg_conf, buf_size);
	index = stream->stream_tag - 1;
	buf_offset = buf_offset + index * 4;

	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + buf_offset, size);

	return 0;
}
EXPORT_SYMBOL_NS(acp_pcm_hw_params, "SND_SOC_SOF_AMD_COMMON");

int acp_pcm_open(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream)
{
	struct acp_dsp_stream *stream;

	stream = acp_dsp_stream_get(sdev, 0);
	if (!stream)
		return -ENODEV;

	substream->runtime->private_data = stream;
	stream->substream = substream;

	return 0;
}
EXPORT_SYMBOL_NS(acp_pcm_open, "SND_SOC_SOF_AMD_COMMON");

int acp_pcm_close(struct snd_sof_dev *sdev, struct snd_pcm_substream *substream)
{
	struct acp_dsp_stream *stream;

	stream = substream->runtime->private_data;
	if (!stream) {
		dev_err(sdev->dev, "No open stream\n");
		return -EINVAL;
	}

	stream->substream = NULL;
	substream->runtime->private_data = NULL;

	return acp_dsp_stream_put(sdev, stream);
}
EXPORT_SYMBOL_NS(acp_pcm_close, "SND_SOC_SOF_AMD_COMMON");

snd_pcm_uframes_t acp_pcm_pointer(struct snd_sof_dev *sdev,
				  struct snd_pcm_substream *substream)

Annotation

Implementation Notes