Unverified Commit 4a767b1d authored by Vijendar Mukunda's avatar Vijendar Mukunda Committed by Mark Brown
Browse files

ASoC: amd: add acp3x pdm driver dma ops 



This patch adds PDM driver DMA operations.

Signed-off-by: default avatarVijendar Mukunda <Vijendar.Mukunda@amd.com>
Reviewed-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200518171704.24999-8-Vijendar.Mukunda@amd.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent b9901654

sound/soc/amd/renoir/acp3x-pdm-dma.c

+195 −0
Original line number Diff line number Diff line
@@ -16,6 +16,25 @@ 


#define DRV_NAME "acp_rn_pdm_dma"



static const struct snd_pcm_hardware acp_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 irqreturn_t pdm_irq_handler(int irq, void *dev_id)

{

	struct pdm_dev_data *rn_pdm_data;
@@ -41,6 +60,176 @@ static irqreturn_t pdm_irq_handler(int irq, void *dev_id) 
		return IRQ_NONE;

}



static void init_pdm_ring_buffer(u32 physical_addr,

				 u32 buffer_size,

				 u32 watermark_size,

				 void __iomem *acp_base)

{

	rn_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);

	rn_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);

	rn_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);

	rn_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);

}



static void enable_pdm_interrupts(void __iomem *acp_base)

{

	u32 ext_int_ctrl;



	ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);

	ext_int_ctrl |= PDM_DMA_INTR_MASK;

	rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);

}



static void disable_pdm_interrupts(void __iomem *acp_base)

{

	u32 ext_int_ctrl;



	ext_int_ctrl = rn_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);

	ext_int_ctrl |= ~PDM_DMA_INTR_MASK;

	rn_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);

}



static void config_acp_dma(struct pdm_stream_instance *rtd, int direction)

{

	u16 page_idx;

	u32 low, high, val;

	dma_addr_t addr;



	addr = rtd->dma_addr;

	val = 0;



	/* Group Enable */

	rn_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp_base +

		  ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);

	rn_writel(PAGE_SIZE_4K_ENABLE, rtd->acp_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);



		rn_writel(low, rtd->acp_base + ACP_SCRATCH_REG_0 + val);

		high |= BIT(31);

		rn_writel(high, rtd->acp_base + ACP_SCRATCH_REG_0 + val + 4);

		val += 8;

		addr += PAGE_SIZE;

	}

}



static int acp_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 = acp_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;

	}



	enable_pdm_interrupts(adata->acp_base);



	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)

		adata->capture_stream = substream;



	pdm_data->acp_base = adata->acp_base;

	runtime->private_data = pdm_data;

	return ret;

}



static int acp_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->dma_buffer.addr;

	rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);

	config_acp_dma(rtd, substream->stream);

	init_pdm_ring_buffer(MEM_WINDOW_START, size, period_bytes,

			     rtd->acp_base);

	return 0;

}



static u64 acp_pdm_get_byte_count(struct pdm_stream_instance *rtd,

				  int direction)

{

	union acp_pdm_dma_count byte_count;



	byte_count.bcount.high =

			rn_readl(rtd->acp_base +

				 ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);

	byte_count.bcount.low =

			rn_readl(rtd->acp_base +

				 ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);

	return byte_count.bytescount;

}



static snd_pcm_uframes_t acp_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 = acp_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 acp_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 acp_pdm_dma_mmap(struct snd_soc_component *component,

			    struct snd_pcm_substream *substream,

			    struct vm_area_struct *vma)

{

	return snd_pcm_lib_default_mmap(substream, vma);

}



static int acp_pdm_dma_close(struct snd_soc_component *component,

			     struct snd_pcm_substream *substream)

{

	struct pdm_dev_data *adata = dev_get_drvdata(component->dev);



	disable_pdm_interrupts(adata->acp_base);

	adata->capture_stream = NULL;

	return 0;

}



static struct snd_soc_dai_driver acp_pdm_dai_driver = {

	.capture = {

		.rates = SNDRV_PCM_RATE_48000,
@@ -55,6 +244,12 @@ static struct snd_soc_dai_driver acp_pdm_dai_driver = { 


static const struct snd_soc_component_driver acp_pdm_component = {

	.name		= DRV_NAME,

	.open		= acp_pdm_dma_open,

	.close		= acp_pdm_dma_close,

	.hw_params	= acp_pdm_dma_hw_params,

	.pointer	= acp_pdm_dma_pointer,

	.mmap		= acp_pdm_dma_mmap,

	.pcm_construct	= acp_pdm_dma_new,

};



static int acp_pdm_audio_probe(struct platform_device *pdev)

sound/soc/amd/renoir/rn_acp3x.h

+29 −0
Original line number Diff line number Diff line
@@ -29,13 +29,42 @@ 
#define ACP_ERROR_MASK 0x20000000

#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 ACP_SRAM_PTE_OFFSET	0x02050000

#define PAGE_SIZE_4K_ENABLE     0x2

#define 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

struct pdm_dev_data {

	u32 pdm_irq;

	void __iomem *acp_base;

	struct snd_pcm_substream *capture_stream;

};



struct pdm_stream_instance {

	u16 num_pages;

	u16 channels;

	dma_addr_t dma_addr;

	u64 bytescount;

	void __iomem *acp_base;

};



union acp_pdm_dma_count {

	struct {

	u32 low;

	u32 high;

	} bcount;

	u64 bytescount;

};



static inline u32 rn_readl(void __iomem *base_addr)

{

	return readl(base_addr - ACP_PHY_BASE_ADDRESS);