[PATCH V2 3/9] ASoC: amd: ps: add SoundWire dma driver

Vijendar Mukunda
2023-05-22T13:27:06Z

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>
---
sound/soc/amd/ps/acp63.h | 5 +++
sound/soc/amd/ps/ps-sdw-dma.c | 70 +++++++++++++++++++++++++++++++++++
2 files changed, 75 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 d296059be4f0..eec58da7ec8b 100644
--- a/sound/soc/amd/ps/acp63.h
+++ b/sound/soc/amd/ps/acp63.h
@@ -148,6 +148,11 @@ 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..f41849fd035c
--- /dev/null
+++ b/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;
+ 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 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);
--
2.34.1