[PATCH 05/14][SRU][UNSTABLE] ASoC: amd: add acp6x pdm platform driver

[Alex Hung]

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

BugLink: https://bugs.launchpad.net/bugs/1949245

PDM platform driver binds to the platform device created by
ACP6x PCI device. PDM driver registers ALSA DMA and CPU DAI
components with ASoC framework.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
Link: https://lore.kernel.org/r/20211018112044.1705805-6-Vijendar.Mukunda@amd.com
Signed-off-by: Mark Brown <broonie at kernel.org>
(cherry picked from commit 7610174a5bfe6cf34eda8f972311e629ae6dc2d1 linux-next)
Signed-off-by: Alex Hung <alex.hung at canonical.com>
---
 sound/soc/amd/yc/acp6x-pdm-dma.c | 81 ++++++++++++++++++++++++++++++++++++++++
 sound/soc/amd/yc/acp6x.h         |  5 +++
 2 files changed, 86 insertions(+)
 create mode 100644 sound/soc/amd/yc/acp6x-pdm-dma.c

diff --git a/sound/soc/amd/yc/acp6x-pdm-dma.c b/sound/soc/amd/yc/acp6x-pdm-dma.c
new file mode 100644
index 0000000..75228ce
--- /dev/null
+++ b/sound/soc/amd/yc/acp6x-pdm-dma.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AMD ALSA SoC Yellow Carp PDM Driver
+ *
+ * Copyright 2021 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 "acp6x.h"
+
+#define DRV_NAME "acp_yc_pdm_dma"
+
+static struct snd_soc_dai_driver acp6x_pdm_dai_driver = {
+	.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 acp6x_pdm_component = {
+	.name		= DRV_NAME,
+};
+
+static int acp6x_pdm_audio_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct pdm_dev_data *adata;
+	int status;
+
+	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->acp6x_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!adata->acp6x_base)
+		return -ENOMEM;
+
+	adata->capture_stream = NULL;
+
+	dev_set_drvdata(&pdev->dev, adata);
+	status = devm_snd_soc_register_component(&pdev->dev,
+						 &acp6x_pdm_component,
+						 &acp6x_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 acp6x_pdm_dma_driver = {
+	.probe = acp6x_pdm_audio_probe,
+	.driver = {
+		.name = "acp_yc_pdm_dma",
+	},
+};
+
+module_platform_driver(acp6x_pdm_dma_driver);
+
+MODULE_AUTHOR("Vijendar.Mukunda at amd.com");
+MODULE_DESCRIPTION("AMD ACP6x YC PDM Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/sound/soc/amd/yc/acp6x.h b/sound/soc/amd/yc/acp6x.h
index 63bdea3..d6b2c70c 100644
--- a/sound/soc/amd/yc/acp6x.h
+++ b/sound/soc/amd/yc/acp6x.h
@@ -45,6 +45,11 @@ enum acp_config {
 	ACP_CONFIG_15,
 };
 
+struct pdm_dev_data {
+	void __iomem *acp6x_base;
+	struct snd_pcm_substream *capture_stream;
+};
+
 static inline u32 acp6x_readl(void __iomem *base_addr)
 {
 	return readl(base_addr - ACP6x_PHY_BASE_ADDRESS);
-- 
2.7.4