1 files changed, 455 insertions, 0 deletions
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 000000000000..72c4591e451b
--- /dev/null
+++ b/sound/soc/amd/yc/acp6x-pdm-dma.c
@@ -0,0 +1,455 @@
+// 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/bitfield.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 int pdm_gain = 3;
+module_param(pdm_gain, int, 0644);
+MODULE_PARM_DESC(pdm_gain, "Gain control (0-3)");
+
+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_GAIN_CONTROL;
+	pdm_ctrl |= FIELD_PREP(ACP_WOV_GAIN_CONTROL, clamp(pdm_gain, 0, 3));
+	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,
+	.legacy_dai_naming	= 1,
+};
+
+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_mark_last_busy(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	return 0;
+}
+
+static void acp6x_pdm_audio_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+}
+
+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_new = 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);