Re: [PATCH 3/9] ASoC: amd: ps: add soundwire dma driver

[Pierre-Louis Bossart]

On 5/16/23 05:35, Vijendar Mukunda wrote:
> Soundwire DMA platform driver binds to the platform device created by
> ACP PCI device. Soundwire DMA driver registers ALSA DMA component
> with ASoC framework.
> 
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
> ---
>  sound/soc/amd/ps/acp63.h      |  5 +++
>  sound/soc/amd/ps/ps-sdw-dma.c | 71 +++++++++++++++++++++++++++++++++++
>  2 files changed, 76 insertions(+)
>  create mode 100644 sound/soc/amd/ps/ps-sdw-dma.c
> 
> diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
> index faf7be4d77c2..f86c60cd1565 100644
> --- a/sound/soc/amd/ps/acp63.h
> +++ b/sound/soc/amd/ps/acp63.h
> @@ -111,6 +111,11 @@ struct pdm_dev_data {
>  	struct snd_pcm_substream *capture_stream;
>  };
>  
> +struct sdw_dma_dev_data {
> +	void __iomem *acp_base;
> +	struct mutex *acp_lock; /* used to protect acp common register access */
> +};
> +
>  /**
>   * struct acp63_dev_data - acp pci driver context
>   * @acp63_base: acp mmio base
> diff --git a/sound/soc/amd/ps/ps-sdw-dma.c b/sound/soc/amd/ps/ps-sdw-dma.c
> new file mode 100644
> index 000000000000..0d0889842413
> --- /dev/null
> +++ b/sound/soc/amd/ps/ps-sdw-dma.c
> @@ -0,0 +1,71 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * AMD ALSA SoC Pink Sardine Soundwire DMA Driver
> + *
> + * Copyright 2023 Advanced Micro Devices, Inc.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <sound/pcm_params.h>
> +#include <sound/soc.h>
> +#include <sound/soc-dai.h>
> +#include "acp63.h"
> +
> +#define DRV_NAME "amd_ps_sdw_dma"
> +
> +static const struct snd_soc_component_driver acp63_sdw_component = {
> +	.name		= DRV_NAME,
> +};
> +
> +static int acp63_sdw_platform_probe(struct platform_device *pdev)
> +{
> +	struct resource *res;
> +	struct sdw_dma_dev_data *sdw_data;
> +	int status;
> +
> +	if (!pdev->dev.platform_data) {
> +		dev_err(&pdev->dev, "platform_data not retrieved\n");
> +		return -ENODEV;
> +	}
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
> +		return -ENODEV;
> +	}
> +
> +	sdw_data = devm_kzalloc(&pdev->dev, sizeof(*sdw_data), GFP_KERNEL);
> +	if (!sdw_data)
> +		return -ENOMEM;
> +
> +	sdw_data->acp_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> +	if (!sdw_data->acp_base)
> +		return -ENOMEM;
> +
> +	sdw_data->acp_lock = pdev->dev.platform_data;
> +	dev_set_drvdata(&pdev->dev, sdw_data);
> +	status = devm_snd_soc_register_component(&pdev->dev,
> +						 &acp63_sdw_component,
> +						 NULL, 0);
> +	if (status) {
> +		dev_err(&pdev->dev, "Fail to register sdw dma component\n");
> +		return -ENODEV;

return status;

> +	}
> +	return 0;
> +}
> +
> +static struct platform_driver acp63_sdw_dma_driver = {
> +	.probe = acp63_sdw_platform_probe,
> +	.driver = {
> +		.name = "amd_ps_sdw_dma",
> +	},
> +};
> +
> +module_platform_driver(acp63_sdw_dma_driver);
> +
> +MODULE_AUTHOR("Vijendar.Mukunda@xxxxxxx");
> +MODULE_DESCRIPTION("AMD ACP6.3 PS SDW DMA Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" DRV_NAME);