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From:   Vijendar Mukunda <Vijendar.Mukunda@amd.com>
To:     <--to=broonie@kernel.org>
CC:     <alsa-devel@alsa-project.org>, <Basavaraj.Hiregoudar@amd.com>,
        <Sunil-kumar.Dommati@amd.com>, <Mastan.Katragadda@amd.com>,
        <Arungopal.kondaveeti@amd.com>,
        Vijendar Mukunda <Vijendar.Mukunda@amd.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        "Syed Saba Kareem" <Syed.SabaKareem@amd.com>,
        Mario Limonciello <mario.limonciello@amd.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 3/9] ASoC: amd: ps: add soundwire dma driver
Date:   Tue, 16 May 2023 16:05:37 +0530
Message-ID: <20230516103543.2515097-4-Vijendar.Mukunda@amd.com>
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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 | 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 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@amd.com");
+MODULE_DESCRIPTION("AMD ACP6.3 PS SDW DMA Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
-- 
2.34.1