sound/soc/amd/yc/acp6x-pdm-dma.c - SHIFTPHONES/mainline/linux - Gitiles

 // 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 <linux/pm_runtime.h>

 #include "acp6x.h"

 #define DRV_NAME "acp_yc_pdm_dma"

 static const struct snd_pcm_hardware acp6x_pdm_hardware_capture = {
 	.info = SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
 		SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_MMAP_VALID |
 		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
 	.formats = SNDRV_PCM_FMTBIT_S32_LE,
 	.channels_min = 2,
 	.channels_max = 2,
 	.rates = SNDRV_PCM_RATE_48000,
 	.rate_min = 48000,
 	.rate_max = 48000,
 	.buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
 	.period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
 	.period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
 	.periods_min = CAPTURE_MIN_NUM_PERIODS,
 	.periods_max = CAPTURE_MAX_NUM_PERIODS,
 };

 static void acp6x_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
 				       u32 watermark_size, void __iomem *acp_base)
 {
 	acp6x_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
 	acp6x_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
 	acp6x_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
 	acp6x_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
 }

 static void acp6x_enable_pdm_clock(void __iomem *acp_base)
 {
 	u32 pdm_clk_enable, pdm_ctrl;

 	pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
 	pdm_ctrl = 0x00;

 	acp6x_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
 	pdm_ctrl = acp6x_readl(acp_base + ACP_WOV_MISC_CTRL);
 	pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK;
 	acp6x_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
 }

 static void acp6x_enable_pdm_interrupts(void __iomem *acp_base)
 {
 	u32 ext_int_ctrl;

 	ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
 	ext_int_ctrl |= PDM_DMA_INTR_MASK;
 	acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
 }

 static void acp6x_disable_pdm_interrupts(void __iomem *acp_base)
 {
 	u32 ext_int_ctrl;

 	ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
 	ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
 	acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
 }

 static bool acp6x_check_pdm_dma_status(void __iomem *acp_base)
 {
 	bool pdm_dma_status;
 	u32 pdm_enable, pdm_dma_enable;

 	pdm_dma_status = false;
 	pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
 	pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 	if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
 		pdm_dma_status = true;

 	return pdm_dma_status;
 }

 static int acp6x_start_pdm_dma(void __iomem *acp_base)
 {
 	u32 pdm_enable;
 	u32 pdm_dma_enable;
 	int timeout;

 	pdm_enable = 0x01;
 	pdm_dma_enable  = 0x01;

 	acp6x_enable_pdm_clock(acp_base);
 	acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
 	acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
 	timeout = 0;
 	while (++timeout < ACP_COUNTER) {
 		pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 		if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
 			return 0;
 		udelay(DELAY_US);
 	}
 	return -ETIMEDOUT;
 }

 static int acp6x_stop_pdm_dma(void __iomem *acp_base)
 {
 	u32 pdm_enable, pdm_dma_enable;
 	int timeout;

 	pdm_enable = 0x00;
 	pdm_dma_enable  = 0x00;

 	pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
 	pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 	if (pdm_dma_enable & 0x01) {
 		pdm_dma_enable = 0x02;
 		acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
 		timeout = 0;
 		while (++timeout < ACP_COUNTER) {
 			pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 			if ((pdm_dma_enable & 0x02) == 0x00)
 				break;
 			udelay(DELAY_US);
 		}
 		if (timeout == ACP_COUNTER)
 			return -ETIMEDOUT;
 	}
 	if (pdm_enable == ACP_PDM_ENABLE) {
 		pdm_enable = ACP_PDM_DISABLE;
 		acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
 	}
 	acp6x_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
 	return 0;
 }

 static void acp6x_config_dma(struct pdm_stream_instance *rtd, int direction)
 {
 	u16 page_idx;
 	u32 low, high, val;
 	dma_addr_t addr;

 	addr = rtd->dma_addr;
 	val = PDM_PTE_OFFSET;

 	/* Group Enable */
 	acp6x_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp6x_base +
 		     ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
 	acp6x_writel(PAGE_SIZE_4K_ENABLE, rtd->acp6x_base +
 		     ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
 	for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
 		/* Load the low address of page int ACP SRAM through SRBM */
 		low = lower_32_bits(addr);
 		high = upper_32_bits(addr);

 		acp6x_writel(low, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val);
 		high |= BIT(31);
 		acp6x_writel(high, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val + 4);
 		val += 8;
 		addr += PAGE_SIZE;
 	}
 }

 static int acp6x_pdm_dma_open(struct snd_soc_component *component,
 			      struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime;
 	struct pdm_dev_data *adata;
 	struct pdm_stream_instance *pdm_data;
 	int ret;

 	runtime = substream->runtime;
 	adata = dev_get_drvdata(component->dev);
 	pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
 	if (!pdm_data)
 		return -EINVAL;

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		runtime->hw = acp6x_pdm_hardware_capture;

 	ret = snd_pcm_hw_constraint_integer(runtime,
 					    SNDRV_PCM_HW_PARAM_PERIODS);
 	if (ret < 0) {
 		dev_err(component->dev, "set integer constraint failed\n");
 		kfree(pdm_data);
 		return ret;
 	}

 	acp6x_enable_pdm_interrupts(adata->acp6x_base);

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		adata->capture_stream = substream;

 	pdm_data->acp6x_base = adata->acp6x_base;
 	runtime->private_data = pdm_data;
 	return ret;
 }

 static int acp6x_pdm_dma_hw_params(struct snd_soc_component *component,
 				   struct snd_pcm_substream *substream,
 				   struct snd_pcm_hw_params *params)
 {
 	struct pdm_stream_instance *rtd;
 	size_t size, period_bytes;

 	rtd = substream->runtime->private_data;
 	if (!rtd)
 		return -EINVAL;
 	size = params_buffer_bytes(params);
 	period_bytes = params_period_bytes(params);
 	rtd->dma_addr = substream->runtime->dma_addr;
 	rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
 	acp6x_config_dma(rtd, substream->stream);
 	acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
 				   period_bytes, rtd->acp6x_base);
 	return 0;
 }

 static u64 acp6x_pdm_get_byte_count(struct pdm_stream_instance *rtd,
 				    int direction)
 {
 	union acp_pdm_dma_count byte_count;

 	byte_count.bcount.high =
 			acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
 	byte_count.bcount.low =
 			acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
 	return byte_count.bytescount;
 }

 static snd_pcm_uframes_t acp6x_pdm_dma_pointer(struct snd_soc_component *comp,
 					       struct snd_pcm_substream *stream)
 {
 	struct pdm_stream_instance *rtd;
 	u32 pos, buffersize;
 	u64 bytescount;

 	rtd = stream->runtime->private_data;
 	buffersize = frames_to_bytes(stream->runtime,
 				     stream->runtime->buffer_size);
 	bytescount = acp6x_pdm_get_byte_count(rtd, stream->stream);
 	if (bytescount > rtd->bytescount)
 		bytescount -= rtd->bytescount;
 	pos = do_div(bytescount, buffersize);
 	return bytes_to_frames(stream->runtime, pos);
 }

 static int acp6x_pdm_dma_new(struct snd_soc_component *component,
 			     struct snd_soc_pcm_runtime *rtd)
 {
 	struct device *parent = component->dev->parent;

 	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 				       parent, MIN_BUFFER, MAX_BUFFER);
 	return 0;
 }

 static int acp6x_pdm_dma_close(struct snd_soc_component *component,
 			       struct snd_pcm_substream *substream)
 {
 	struct pdm_dev_data *adata = dev_get_drvdata(component->dev);

 	acp6x_disable_pdm_interrupts(adata->acp6x_base);
 	adata->capture_stream = NULL;
 	return 0;
 }

 static int acp6x_pdm_dai_trigger(struct snd_pcm_substream *substream,
 				 int cmd, struct snd_soc_dai *dai)
 {
 	struct pdm_stream_instance *rtd;
 	int ret;
 	bool pdm_status;
 	unsigned int ch_mask;

 	rtd = substream->runtime->private_data;
 	ret = 0;
 	switch (substream->runtime->channels) {
 	case TWO_CH:
 		ch_mask = 0x00;
 		break;
 	default:
 		return -EINVAL;
 	}
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		acp6x_writel(ch_mask, rtd->acp6x_base + ACP_WOV_PDM_NO_OF_CHANNELS);
 		acp6x_writel(PDM_DECIMATION_FACTOR, rtd->acp6x_base +
 			     ACP_WOV_PDM_DECIMATION_FACTOR);
 		rtd->bytescount = acp6x_pdm_get_byte_count(rtd, substream->stream);
 		pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
 		if (!pdm_status)
 			ret = acp6x_start_pdm_dma(rtd->acp6x_base);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
 		if (pdm_status)
 			ret = acp6x_stop_pdm_dma(rtd->acp6x_base);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static const struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
 	.trigger   = acp6x_pdm_dai_trigger,
 };

 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,
 	},
 	.ops = &acp6x_pdm_dai_ops,
 };

 static const struct snd_soc_component_driver acp6x_pdm_component = {
 	.name		= DRV_NAME,
 	.open		= acp6x_pdm_dma_open,
 	.close		= acp6x_pdm_dma_close,
 	.hw_params	= acp6x_pdm_dma_hw_params,
 	.pointer	= acp6x_pdm_dma_pointer,
 	.pcm_construct	= acp6x_pdm_dma_new,
 };

 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;
 	}
 	pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_allow(&pdev->dev);
 	return 0;
 }

 static int acp6x_pdm_audio_remove(struct platform_device *pdev)
 {
 	pm_runtime_disable(&pdev->dev);
 	return 0;
 }

 static int __maybe_unused acp6x_pdm_resume(struct device *dev)
 {
 	struct pdm_dev_data *adata;
 	struct snd_pcm_runtime *runtime;
 	struct pdm_stream_instance *rtd;
 	u32 period_bytes, buffer_len;

 	adata = dev_get_drvdata(dev);
 	if (adata->capture_stream && adata->capture_stream->runtime) {
 		runtime = adata->capture_stream->runtime;
 		rtd = runtime->private_data;
 		period_bytes = frames_to_bytes(runtime, runtime->period_size);
 		buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
 		acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
 		acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
 					   period_bytes, adata->acp6x_base);
 	}
 	acp6x_enable_pdm_interrupts(adata->acp6x_base);
 	return 0;
 }

 static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
 {
 	struct pdm_dev_data *adata;

 	adata = dev_get_drvdata(dev);
 	acp6x_disable_pdm_interrupts(adata->acp6x_base);
 	return 0;
 }

 static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
 {
 	struct pdm_dev_data *adata;

 	adata = dev_get_drvdata(dev);
 	acp6x_enable_pdm_interrupts(adata->acp6x_base);
 	return 0;
 }

 static const struct dev_pm_ops acp6x_pdm_pm_ops = {
 	SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
 	SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
 };

 static struct platform_driver acp6x_pdm_dma_driver = {
 	.probe = acp6x_pdm_audio_probe,
 	.remove = acp6x_pdm_audio_remove,
 	.driver = {
 		.name = "acp_yc_pdm_dma",
 		.pm = &acp6x_pdm_pm_ops,
 	},
 };

 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);
	// 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 <linux/pm_runtime.h>

	#include "acp6x.h"

	#define DRV_NAME "acp_yc_pdm_dma"

	static const struct snd_pcm_hardware acp6x_pdm_hardware_capture = {
	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_PAUSE \| SNDRV_PCM_INFO_RESUME,
	.formats = SNDRV_PCM_FMTBIT_S32_LE,
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_48000,
	.rate_min = 48000,
	.rate_max = 48000,
	.buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
	.period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
	.period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
	.periods_min = CAPTURE_MIN_NUM_PERIODS,
	.periods_max = CAPTURE_MAX_NUM_PERIODS,
	};

	static void acp6x_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
	u32 watermark_size, void __iomem *acp_base)
	{
	acp6x_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
	acp6x_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
	acp6x_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
	acp6x_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
	}

	static void acp6x_enable_pdm_clock(void __iomem *acp_base)
	{
	u32 pdm_clk_enable, pdm_ctrl;

	pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
	pdm_ctrl = 0x00;

	acp6x_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
	pdm_ctrl = acp6x_readl(acp_base + ACP_WOV_MISC_CTRL);
	pdm_ctrl \|= ACP_WOV_MISC_CTRL_MASK;
	acp6x_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
	}

	static void acp6x_enable_pdm_interrupts(void __iomem *acp_base)
	{
	u32 ext_int_ctrl;

	ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
	ext_int_ctrl \|= PDM_DMA_INTR_MASK;
	acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
	}

	static void acp6x_disable_pdm_interrupts(void __iomem *acp_base)
	{
	u32 ext_int_ctrl;

	ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
	ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
	acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
	}

	static bool acp6x_check_pdm_dma_status(void __iomem *acp_base)
	{
	bool pdm_dma_status;
	u32 pdm_enable, pdm_dma_enable;

	pdm_dma_status = false;
	pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
	pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
	if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
	pdm_dma_status = true;

	return pdm_dma_status;
	}

	static int acp6x_start_pdm_dma(void __iomem *acp_base)
	{
	u32 pdm_enable;
	u32 pdm_dma_enable;
	int timeout;

	pdm_enable = 0x01;
	pdm_dma_enable = 0x01;

	acp6x_enable_pdm_clock(acp_base);
	acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
	acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
	timeout = 0;
	while (++timeout < ACP_COUNTER) {
	pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
	if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
	return 0;
	udelay(DELAY_US);
	}
	return -ETIMEDOUT;
	}

	static int acp6x_stop_pdm_dma(void __iomem *acp_base)
	{
	u32 pdm_enable, pdm_dma_enable;
	int timeout;

	pdm_enable = 0x00;
	pdm_dma_enable = 0x00;

	pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
	pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
	if (pdm_dma_enable & 0x01) {
	pdm_dma_enable = 0x02;
	acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
	timeout = 0;
	while (++timeout < ACP_COUNTER) {
	pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
	if ((pdm_dma_enable & 0x02) == 0x00)
	break;
	udelay(DELAY_US);
	}
	if (timeout == ACP_COUNTER)
	return -ETIMEDOUT;
	}
	if (pdm_enable == ACP_PDM_ENABLE) {
	pdm_enable = ACP_PDM_DISABLE;
	acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
	}
	acp6x_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
	return 0;
	}

	static void acp6x_config_dma(struct pdm_stream_instance *rtd, int direction)
	{
	u16 page_idx;
	u32 low, high, val;
	dma_addr_t addr;

	addr = rtd->dma_addr;
	val = PDM_PTE_OFFSET;

	/* Group Enable */
	acp6x_writel(ACP_SRAM_PTE_OFFSET \| BIT(31), rtd->acp6x_base +
	ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
	acp6x_writel(PAGE_SIZE_4K_ENABLE, rtd->acp6x_base +
	ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
	for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
	/* Load the low address of page int ACP SRAM through SRBM */
	low = lower_32_bits(addr);
	high = upper_32_bits(addr);

	acp6x_writel(low, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val);
	high \|= BIT(31);
	acp6x_writel(high, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val + 4);
	val += 8;
	addr += PAGE_SIZE;
	}
	}

	static int acp6x_pdm_dma_open(struct snd_soc_component *component,
	struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime;
	struct pdm_dev_data *adata;
	struct pdm_stream_instance *pdm_data;
	int ret;

	runtime = substream->runtime;
	adata = dev_get_drvdata(component->dev);
	pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
	if (!pdm_data)
	return -EINVAL;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	runtime->hw = acp6x_pdm_hardware_capture;

	ret = snd_pcm_hw_constraint_integer(runtime,
	SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0) {
	dev_err(component->dev, "set integer constraint failed\n");
	kfree(pdm_data);
	return ret;
	}

	acp6x_enable_pdm_interrupts(adata->acp6x_base);

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	adata->capture_stream = substream;

	pdm_data->acp6x_base = adata->acp6x_base;
	runtime->private_data = pdm_data;
	return ret;
	}

	static int acp6x_pdm_dma_hw_params(struct snd_soc_component *component,
	struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct pdm_stream_instance *rtd;
	size_t size, period_bytes;

	rtd = substream->runtime->private_data;
	if (!rtd)
	return -EINVAL;
	size = params_buffer_bytes(params);
	period_bytes = params_period_bytes(params);
	rtd->dma_addr = substream->runtime->dma_addr;
	rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
	acp6x_config_dma(rtd, substream->stream);
	acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
	period_bytes, rtd->acp6x_base);
	return 0;
	}

	static u64 acp6x_pdm_get_byte_count(struct pdm_stream_instance *rtd,
	int direction)
	{
	union acp_pdm_dma_count byte_count;

	byte_count.bcount.high =
	acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
	byte_count.bcount.low =
	acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
	return byte_count.bytescount;
	}

	static snd_pcm_uframes_t acp6x_pdm_dma_pointer(struct snd_soc_component *comp,
	struct snd_pcm_substream *stream)
	{
	struct pdm_stream_instance *rtd;
	u32 pos, buffersize;
	u64 bytescount;

	rtd = stream->runtime->private_data;
	buffersize = frames_to_bytes(stream->runtime,
	stream->runtime->buffer_size);
	bytescount = acp6x_pdm_get_byte_count(rtd, stream->stream);
	if (bytescount > rtd->bytescount)
	bytescount -= rtd->bytescount;
	pos = do_div(bytescount, buffersize);
	return bytes_to_frames(stream->runtime, pos);
	}

	static int acp6x_pdm_dma_new(struct snd_soc_component *component,
	struct snd_soc_pcm_runtime *rtd)
	{
	struct device *parent = component->dev->parent;

	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
	parent, MIN_BUFFER, MAX_BUFFER);
	return 0;
	}

	static int acp6x_pdm_dma_close(struct snd_soc_component *component,
	struct snd_pcm_substream *substream)
	{
	struct pdm_dev_data *adata = dev_get_drvdata(component->dev);

	acp6x_disable_pdm_interrupts(adata->acp6x_base);
	adata->capture_stream = NULL;
	return 0;
	}

	static int acp6x_pdm_dai_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	struct pdm_stream_instance *rtd;
	int ret;
	bool pdm_status;
	unsigned int ch_mask;

	rtd = substream->runtime->private_data;
	ret = 0;
	switch (substream->runtime->channels) {
	case TWO_CH:
	ch_mask = 0x00;
	break;
	default:
	return -EINVAL;
	}
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	acp6x_writel(ch_mask, rtd->acp6x_base + ACP_WOV_PDM_NO_OF_CHANNELS);
	acp6x_writel(PDM_DECIMATION_FACTOR, rtd->acp6x_base +
	ACP_WOV_PDM_DECIMATION_FACTOR);
	rtd->bytescount = acp6x_pdm_get_byte_count(rtd, substream->stream);
	pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
	if (!pdm_status)
	ret = acp6x_start_pdm_dma(rtd->acp6x_base);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
	if (pdm_status)
	ret = acp6x_stop_pdm_dma(rtd->acp6x_base);
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static const struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
	.trigger = acp6x_pdm_dai_trigger,
	};

	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,
	},
	.ops = &acp6x_pdm_dai_ops,
	};

	static const struct snd_soc_component_driver acp6x_pdm_component = {
	.name = DRV_NAME,
	.open = acp6x_pdm_dma_open,
	.close = acp6x_pdm_dma_close,
	.hw_params = acp6x_pdm_dma_hw_params,
	.pointer = acp6x_pdm_dma_pointer,
	.pcm_construct = acp6x_pdm_dma_new,
	};

	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;
	}
	pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
	pm_runtime_use_autosuspend(&pdev->dev);
	pm_runtime_enable(&pdev->dev);
	pm_runtime_allow(&pdev->dev);
	return 0;
	}

	static int acp6x_pdm_audio_remove(struct platform_device *pdev)
	{
	pm_runtime_disable(&pdev->dev);
	return 0;
	}

	static int __maybe_unused acp6x_pdm_resume(struct device *dev)
	{
	struct pdm_dev_data *adata;
	struct snd_pcm_runtime *runtime;
	struct pdm_stream_instance *rtd;
	u32 period_bytes, buffer_len;

	adata = dev_get_drvdata(dev);
	if (adata->capture_stream && adata->capture_stream->runtime) {
	runtime = adata->capture_stream->runtime;
	rtd = runtime->private_data;
	period_bytes = frames_to_bytes(runtime, runtime->period_size);
	buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
	acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
	acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
	period_bytes, adata->acp6x_base);
	}
	acp6x_enable_pdm_interrupts(adata->acp6x_base);
	return 0;
	}

	static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
	{
	struct pdm_dev_data *adata;

	adata = dev_get_drvdata(dev);
	acp6x_disable_pdm_interrupts(adata->acp6x_base);
	return 0;
	}

	static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
	{
	struct pdm_dev_data *adata;

	adata = dev_get_drvdata(dev);
	acp6x_enable_pdm_interrupts(adata->acp6x_base);
	return 0;
	}

	static const struct dev_pm_ops acp6x_pdm_pm_ops = {
	SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
	SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
	};

	static struct platform_driver acp6x_pdm_dma_driver = {
	.probe = acp6x_pdm_audio_probe,
	.remove = acp6x_pdm_audio_remove,
	.driver = {
	.name = "acp_yc_pdm_dma",
	.pm = &acp6x_pdm_pm_ops,
	},
	};

	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);