ASoC: amd: ps: add SoundWire dma driver

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@amd.com>
Link: https://lore.kernel.org/r/20230612095903.2113464-4-Vijendar.Mukunda@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: vijendarmukunda

sound/soc/amd/ps/acp63.h

@@ -137,6 +137,11 @@ 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

sound/soc/amd/ps/ps-sdw-dma.c

@@ -0,0 +1,70 @@
+// 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;
+	struct acp63_dev_data *acp_data;
+	struct device *parent;
+	int status;
+
+	parent = pdev->dev.parent;
+	acp_data = dev_get_drvdata(parent);
+	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 = &acp_data->acp_lock;
+	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 status;
+}
+
+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@amd.com");
+MODULE_DESCRIPTION("AMD ACP6.3 PS SDW DMA Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);