[PATCH 05/14] ASoC: amd: add ACP3x PDM platform driver

[Alex Deucher]

From: Vijendar Mukunda <Vijendar.Mukunda at amd.com>

PDM platform driver binds to the platform device created by
ACP3x PCI device. PDM driver registers ALSA DMA and CPU DAI
components with ASoC framework.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 sound/soc/amd/renoir/acp3x-pdm-dma.c | 101 +++++++++++++++++++++++++++
 sound/soc/amd/renoir/rn_acp3x.h      |   5 ++
 2 files changed, 106 insertions(+)
 create mode 100644 sound/soc/amd/renoir/acp3x-pdm-dma.c

diff --git a/sound/soc/amd/renoir/acp3x-pdm-dma.c b/sound/soc/amd/renoir/acp3x-pdm-dma.c
new file mode 100644
index 000000000000..680b2505d65d
--- /dev/null
+++ b/sound/soc/amd/renoir/acp3x-pdm-dma.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// AMD ALSA SoC PDM Driver
+//
+//Copyright 2020 Advanced Micro Devices, Inc.
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "rn_acp3x.h"
+
+#define DRV_NAME "acp_rn_pdm_dma"
+
+static struct snd_soc_dai_ops acp_pdm_dai_ops = {
+	.hw_params = NULL,
+	.trigger   = NULL,
+};
+
+static struct snd_soc_dai_driver acp_pdm_dai_driver = {
+	.capture = {
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S24_LE |
+			   SNDRV_PCM_FMTBIT_S32_LE,
+		.channels_min = 2,
+		.channels_max = 2,
+		.rate_min = 48000,
+		.rate_max = 48000,
+	},
+	.ops = &acp_pdm_dai_ops,
+};
+
+static const struct snd_soc_component_driver acp_pdm_component = {
+	.name		= DRV_NAME,
+};
+
+static int acp_pdm_audio_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct pdm_dev_data *adata;
+	unsigned int irqflags;
+	int status;
+
+	if (!pdev->dev.platform_data) {
+		dev_err(&pdev->dev, "platform_data not retrieved\n");
+		return -ENODEV;
+	}
+	irqflags = *((unsigned int *)(pdev->dev.platform_data));
+
+	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->acp_base = devm_ioremap(&pdev->dev, res->start,
+				       resource_size(res));
+	if (!adata->acp_base)
+		return -ENOMEM;
+
+	adata->capture_stream = NULL;
+
+	dev_set_drvdata(&pdev->dev, adata);
+	status = devm_snd_soc_register_component(&pdev->dev,
+						 &acp_pdm_component,
+						 &acp_pdm_dai_driver, 1);
+	if (status) {
+		dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
+
+		return -ENODEV;
+	}
+	return 0;
+}
+
+static int acp_pdm_audio_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver acp_pdm_dma_driver = {
+	.probe = acp_pdm_audio_probe,
+	.remove = acp_pdm_audio_remove,
+	.driver = {
+		.name = "acp_rn_pdm_dma",
+	},
+};
+
+module_platform_driver(acp_pdm_dma_driver);
+
+MODULE_AUTHOR("Vijendar.Mukunda at amd.com");
+MODULE_DESCRIPTION("AMD ACP3x Renior PDM Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/sound/soc/amd/renoir/rn_acp3x.h b/sound/soc/amd/renoir/rn_acp3x.h
index 5e4fd99397d5..0b450882c6c4 100644
--- a/sound/soc/amd/renoir/rn_acp3x.h
+++ b/sound/soc/amd/renoir/rn_acp3x.h
@@ -29,6 +29,11 @@
 #define ACP_ERROR_MASK 0x20000000
 #define ACP_EXT_INTR_STAT_CLEAR_MASK 0xFFFFFFFF
 
+struct pdm_dev_data {
+	void __iomem *acp_base;
+	struct snd_pcm_substream *capture_stream;
+};
+
 static inline u32 rn_readl(void __iomem *base_addr)
 {
 	return readl(base_addr - ACP_PHY_BASE_ADDRESS);
-- 
2.25.4