linux-kernel - [PATCH 07/21] ASoC: amd: acp70: add acp pdm platform driver

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Message-ID: <20241219054857.2070420-8-Vijendar.Mukunda@amd.com>
Date: Thu, 19 Dec 2024 11:18:43 +0530
From: Vijendar Mukunda <Vijendar.Mukunda@....com>
To: <broonie@...nel.org>
CC: <alsa-devel@...a-project.org>, <lgirdwood@...il.com>, <perex@...ex.cz>,
	<tiwai@...e.com>, <Basavaraj.Hiregoudar@....com>,
	<Sunil-kumar.Dommati@....com>, <venkataprasad.potturu@....com>,
	<Mario.Limonciello@....com>, <linux-sound@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Vijendar Mukunda <Vijendar.Mukunda@....com>
Subject: [PATCH 07/21] ASoC: amd: acp70: add acp pdm platform driver

PDM platform driver binds to the platform device created by
ACP7.0 PCI device. PDM driver registers ALSA DMA and CPU DAI
components with ASoC framework.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
 sound/soc/amd/acp70/Makefile        |  2 +
 sound/soc/amd/acp70/acp70-pdm-dma.c | 87 +++++++++++++++++++++++++++++
 sound/soc/amd/acp70/acp70.h         |  7 +++
 3 files changed, 96 insertions(+)
 create mode 100644 sound/soc/amd/acp70/acp70-pdm-dma.c

diff --git a/sound/soc/amd/acp70/Makefile b/sound/soc/amd/acp70/Makefile
index 5e553de6c772..778bdf268731 100644
--- a/sound/soc/amd/acp70/Makefile
+++ b/sound/soc/amd/acp70/Makefile
@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 # ACP 7.0 platform Support
 snd-pci-acp70-y := pci-acp70.o
+snd-acp70-pdm-dma-y := acp70-pdm-dma.o
 
 obj-$(CONFIG_SND_SOC_AMD_ACP70) += snd-pci-acp70.o
+obj-$(CONFIG_SND_SOC_AMD_ACP70) += snd-acp70-pdm-dma.o
diff --git a/sound/soc/amd/acp70/acp70-pdm-dma.c b/sound/soc/amd/acp70/acp70-pdm-dma.c
new file mode 100644
index 000000000000..fd31e31a02a6
--- /dev/null
+++ b/sound/soc/amd/acp70/acp70-pdm-dma.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD ALSA SoC ACP 7.0 PDM Driver
+ *
+ * Copyright 2024 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/bitfield.h>
+#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 "acp70.h"
+
+#define DRV_NAME "acp70_pdm_dma"
+
+static struct snd_soc_dai_driver acp70_pdm_dai_driver = {
+	.name = "acp_acp70_pdm_dma.0",
+	.capture = {
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S32_LE,
+		.channels_min = 2,
+		.channels_max = 2,
+		.rate_min = 48000,
+		.rate_max = 48000,
+	},
+};
+
+static const struct snd_soc_component_driver acp70_pdm_component = {
+	.name		= DRV_NAME,
+};
+
+static int acp70_pdm_audio_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct pdm_dev_data *adata;
+	struct acp70_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;
+	}
+
+	adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
+	if (!adata)
+		return -ENOMEM;
+
+	adata->acp70_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!adata->acp70_base)
+		return -ENOMEM;
+
+	adata->capture_stream = NULL;
+	adata->acp_lock = &acp_data->acp_lock;
+	dev_set_drvdata(&pdev->dev, adata);
+	status = devm_snd_soc_register_component(&pdev->dev,
+						 &acp70_pdm_component,
+						 &acp70_pdm_dai_driver, 1);
+	if (status) {
+		dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
+
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static struct platform_driver acp70_pdm_dma_driver = {
+	.probe = acp70_pdm_audio_probe,
+	.driver = {
+		.name = "acp70_pdm_dma",
+	},
+};
+
+module_platform_driver(acp70_pdm_dma_driver);
+
+MODULE_AUTHOR("Vijendar.Mukunda@....com");
+MODULE_DESCRIPTION("AMD ACP 7.0 PDM Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/sound/soc/amd/acp70/acp70.h b/sound/soc/amd/acp70/acp70.h
index 68035fbf23d1..c7cabb98cc1a 100644
--- a/sound/soc/amd/acp70/acp70.h
+++ b/sound/soc/amd/acp70/acp70.h
@@ -58,6 +58,13 @@ enum acp_config {
 	ACP_CONFIG_20,
 };
 
+struct pdm_dev_data {
+	u32 pdm_irq;
+	void __iomem *acp70_base;
+	struct mutex *acp_lock; /* mutex to protect acp common register access */
+	struct snd_pcm_substream *capture_stream;
+};
+
 /**
  * struct acp70_dev_data - acp pci driver context
  * @acp70_base: acp mmio base
-- 
2.34.1