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From:   Vijendar Mukunda <Vijendar.Mukunda@amd.com>
To:     <broonie@kernel.org>, <alsa-devel@alsa-project.org>
CC:     <Alexander.Deucher@amd.com>, <Basavaraj.Hiregoudar@amd.com>,
        <Sunil-kumar.Dommati@amd.com>, <Mario.Limonciello@amd.com>,
        <Richard.Gong@amd.com>,
        Vijendar Mukunda <Vijendar.Mukunda@amd.com>,
        "Liam Girdwood" <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        "Takashi Iwai" <tiwai@suse.com>,
        open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 07/13] ASoC: amd: add acp6x pdm driver dma ops
Date:   Mon, 11 Oct 2021 11:26:15 +0530
Message-ID: <20211011055621.13240-8-Vijendar.Mukunda@amd.com>
In-Reply-To: <20211011055621.13240-1-Vijendar.Mukunda@amd.com>
References: <20211011055621.13240-1-Vijendar.Mukunda@amd.com>
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This patch adds PDM driver DMA operations.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
---
 sound/soc/amd/yc/acp6x-pdm-dma.c | 310 +++++++++++++++++++++++++++++++
 sound/soc/amd/yc/acp6x.h         |  41 ++++
 2 files changed, 351 insertions(+)

diff --git a/sound/soc/amd/yc/acp6x-pdm-dma.c b/sound/soc/amd/yc/acp6x-pdm-dma.c
index e1a25268bc5c..3da74b1896e1 100644
--- a/sound/soc/amd/yc/acp6x-pdm-dma.c
+++ b/sound/soc/amd/yc/acp6x-pdm-dma.c
@@ -16,6 +16,310 @@
 
 #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 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,
@@ -25,10 +329,16 @@ static struct snd_soc_dai_driver acp6x_pdm_dai_driver = {
 		.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)
diff --git a/sound/soc/amd/yc/acp6x.h b/sound/soc/amd/yc/acp6x.h
index 4ea37794db84..3f83de229409 100644
--- a/sound/soc/amd/yc/acp6x.h
+++ b/sound/soc/amd/yc/acp6x.h
@@ -27,6 +27,31 @@
 #define ACP_EXT_INTR_STAT_CLEAR_MASK 0xFFFFFFFF
 #define PDM_DMA_STAT 0x10
 
+#define PDM_DMA_INTR_MASK	0x10000
+#define ACP_ERROR_STAT	29
+#define PDM_DECIMATION_FACTOR	2
+#define ACP_PDM_CLK_FREQ_MASK	7
+#define ACP_WOV_MISC_CTRL_MASK	0x10
+#define ACP_PDM_ENABLE		1
+#define ACP_PDM_DISABLE		0
+#define ACP_PDM_DMA_EN_STATUS	2
+#define TWO_CH		2
+#define DELAY_US	5
+#define ACP_COUNTER	20000
+
+#define ACP_SRAM_PTE_OFFSET	0x03800000
+#define PAGE_SIZE_4K_ENABLE	2
+#define PDM_PTE_OFFSET		0
+#define PDM_MEM_WINDOW_START	0x4000000
+
+#define CAPTURE_MIN_NUM_PERIODS     4
+#define CAPTURE_MAX_NUM_PERIODS     4
+#define CAPTURE_MAX_PERIOD_SIZE     8192
+#define CAPTURE_MIN_PERIOD_SIZE     4096
+
+#define MAX_BUFFER (CAPTURE_MAX_PERIOD_SIZE * CAPTURE_MAX_NUM_PERIODS)
+#define MIN_BUFFER MAX_BUFFER
+
 enum acp_config {
 	ACP_CONFIG_0 = 0,
 	ACP_CONFIG_1,
@@ -52,6 +77,22 @@ struct pdm_dev_data {
 	struct snd_pcm_substream *capture_stream;
 };
 
+struct pdm_stream_instance {
+	u16 num_pages;
+	u16 channels;
+	dma_addr_t dma_addr;
+	u64 bytescount;
+	void __iomem *acp6x_base;
+};
+
+union acp_pdm_dma_count {
+	struct {
+	u32 low;
+	u32 high;
+	} bcount;
+	u64 bytescount;
+};
+
 static inline u32 acp6x_readl(void __iomem *base_addr)
 {
 	return readl(base_addr - ACP6x_PHY_BASE_ADDRESS);
-- 
2.25.1