ASoC: amd: add acp6x pdm platform driver

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@amd.com>
Link: https://lore.kernel.org/r/20211018112044.1705805-6-Vijendar.Mukunda@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 7610174a5bfe6cf34eda8f972311e629ae6dc2d1)
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/sound/soc/amd/yc/acp6x-pdm-dma.c b/sound/soc/amd/yc/acp6x-pdm-dma.c
new file mode 100644 (file)
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@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 63bdea3188ea83b6b1aef4cd85e1a4f54e638dd8..d6b2c70ce9c868e1eba36e4fd87cf5ebac652d0d 100644 (file)
--- 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);