Re: [PATCH 08/19] ASoC: amd: ps: add soundwire dma driver dma ops

[Pierre-Louis Bossart]

On 1/11/23 03:02, Vijendar Mukunda wrote:
> Add Soundwire DMA driver dma ops for Pink Sardine platform.
> 
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
> ---
>  sound/soc/amd/ps/acp63.h      |  61 ++++
>  sound/soc/amd/ps/ps-sdw-dma.c | 531 ++++++++++++++++++++++++++++++++++
>  2 files changed, 592 insertions(+)
> 
> diff --git a/sound/soc/amd/ps/acp63.h b/sound/soc/amd/ps/acp63.h
> index b462320fdf2a..8963cfb6120d 100644
> --- a/sound/soc/amd/ps/acp63.h
> +++ b/sound/soc/amd/ps/acp63.h
> @@ -67,6 +67,38 @@
>  #define ACP_SDW0_IRQ_MASK	21
>  #define ACP_SDW1_IRQ_MASK	2
>  #define ACP_ERROR_IRQ_MASK      29
> +#define ACP_AUDIO_TX_THRESHOLD	28
> +#define ACP_BT_TX_THRESHOLD	26
> +#define ACP_HS_TX_THRESHOLD	24
> +#define ACP_AUDIO_RX_THRESHOLD	27
> +#define ACP_BT_RX_THRESHOLD	25
> +#define ACP_HS_RX_THRESHOLD	23
> +#define ACP_P1_BT_TX_THRESHOLD	6
> +#define ACP_P1_BT_RX_THRESHOLD	5
> +#define ACP_SDW_DMA_IRQ_MASK	0x1F800000
> +#define ACP_P1_SDW_DMA_IRQ_MASK	0x60
> +#define ACP63_SDW_MAX_STREAMS		8
> +
> +#define ACP_DELAY_US		5
> +#define SDW_MEM_WINDOW_START	0x4800000
> +#define ACP_SDW_SRAM_PTE_OFFSET	0x03800400
> +#define SDW_PTE_OFFSET		0x400
> +#define SDW_FIFO_SIZE		0x100
> +#define SDW_DMA_SIZE		0x40
> +#define ACP_SDW_FIFO_OFFSET	0x100
> +#define ACP_SDW_RING_BUFF_ADDR_OFFSET (128 * 1024)
> +
> +#define SDW_PLAYBACK_MIN_NUM_PERIODS    2
> +#define SDW_PLAYBACK_MAX_NUM_PERIODS    8
> +#define SDW_PLAYBACK_MAX_PERIOD_SIZE    8192
> +#define SDW_PLAYBACK_MIN_PERIOD_SIZE    1024
> +#define SDW_CAPTURE_MIN_NUM_PERIODS     2
> +#define SDW_CAPTURE_MAX_NUM_PERIODS     8
> +#define SDW_CAPTURE_MAX_PERIOD_SIZE     8192
> +#define SDW_CAPTURE_MIN_PERIOD_SIZE     1024
> +
> +#define SDW_MAX_BUFFER (SDW_PLAYBACK_MAX_PERIOD_SIZE * SDW_PLAYBACK_MAX_NUM_PERIODS)
> +#define SDW_MIN_BUFFER SDW_MAX_BUFFER
>  
>  enum acp_config {
>  	ACP_CONFIG_0 = 0,
> @@ -93,6 +125,17 @@ enum acp_pdev_mask {
>  	ACP63_SDW_PDM_DEV_MASK,
>  };
>  
> +enum channel_type {
> +	ACP_SDW_AUDIO_TX = 0,
> +	ACP_SDW_BT_TX,
> +	ACP_SDW_HS_TX,
> +	ACP_SDW_AUDIO_RX,
> +	ACP_SDW_BT_RX,
> +	ACP_SDW_HS_RX,
> +	ACP_SDW1_BT_TX,
> +	ACP_SDW1_BT_RX,
> +};

this was defined in another patch already?

> +
>  struct pdm_stream_instance {
>  	u16 num_pages;
>  	u16 channels;
> @@ -139,4 +182,22 @@ struct acp63_dev_data {
>  struct sdw_dma_dev_data {
>  	void __iomem *acp_base;
>  	struct mutex *acp_lock;
> +	struct snd_pcm_substream *sdw_stream[ACP63_SDW_MAX_STREAMS];
> +};
> +
> +struct sdw_stream_instance {

sdw_stream is already a well-defined concept. Please use sdw_dma_stream
or something less confusing naming-wise.

> +	u16 num_pages;
> +	u16 channels;
> +	u32 stream_id;
> +	dma_addr_t dma_addr;
> +	u64 bytescount;
> +	void __iomem *acp_base;
> +};
> +
> +union acp_sdw_dma_count {
> +	struct {
> +	u32 low;
> +	u32 high;
> +	} bcount;
> +	u64 bytescount;
>  };
> diff --git a/sound/soc/amd/ps/ps-sdw-dma.c b/sound/soc/amd/ps/ps-sdw-dma.c
> index 388a4b7df715..e94f76053c66 100644
> --- a/sound/soc/amd/ps/ps-sdw-dma.c
> +++ b/sound/soc/amd/ps/ps-sdw-dma.c
> @@ -12,12 +12,543 @@
>  #include <sound/pcm_params.h>
>  #include <sound/soc.h>
>  #include <sound/soc-dai.h>
> +#include <linux/soundwire/sdw_amd.h>
>  #include "acp63.h"
>  
>  #define DRV_NAME "amd_ps_sdw_dma"
>  
> +static const struct snd_pcm_hardware acp63_sdw_hardware_playback = {
> +	.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_S16_LE |  SNDRV_PCM_FMTBIT_S8 |
> +		   SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
> +	.channels_min = 2,
> +	.channels_max = 2,
> +	.rates = SNDRV_PCM_RATE_48000,
> +	.rate_min = 48000,
> +	.rate_max = 48000,

is this really limited to 2ch 48kHz? This doesn't align with the
references to Bluetooth above?

> +	.buffer_bytes_max = SDW_PLAYBACK_MAX_NUM_PERIODS * SDW_PLAYBACK_MAX_PERIOD_SIZE,
> +	.period_bytes_min = SDW_PLAYBACK_MIN_PERIOD_SIZE,
> +	.period_bytes_max = SDW_PLAYBACK_MAX_PERIOD_SIZE,
> +	.periods_min = SDW_PLAYBACK_MIN_NUM_PERIODS,
> +	.periods_max = SDW_PLAYBACK_MAX_NUM_PERIODS,
> +};
> +
> +static const struct snd_pcm_hardware acp63_sdw_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_S16_LE |  SNDRV_PCM_FMTBIT_S8 |
> +		   SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE,
> +	.channels_min = 2,
> +	.channels_max = 2,
> +	.rates = SNDRV_PCM_RATE_48000,
> +	.rate_min = 48000,
> +	.rate_max = 48000,

same here?

> +	.buffer_bytes_max = SDW_CAPTURE_MAX_NUM_PERIODS * SDW_CAPTURE_MAX_PERIOD_SIZE,
> +	.period_bytes_min = SDW_CAPTURE_MIN_PERIOD_SIZE,
> +	.period_bytes_max = SDW_CAPTURE_MAX_PERIOD_SIZE,
> +	.periods_min = SDW_CAPTURE_MIN_NUM_PERIODS,
> +	.periods_max = SDW_CAPTURE_MAX_NUM_PERIODS,
> +};
> +
> +static void acp63_config_dma(struct sdw_stream_instance *sdw_ins, u32 stream_id)
> +{
> +	u16 page_idx;
> +	u32 low, high, val;
> +	dma_addr_t addr;
> +
> +	addr = sdw_ins->dma_addr;
> +	val = SDW_PTE_OFFSET + (stream_id * 256);
> +
> +	/* Group Enable */
> +	acp63_writel(ACP_SDW_SRAM_PTE_OFFSET | BIT(31), sdw_ins->acp_base +
> +		     ACPAXI2AXI_ATU_BASE_ADDR_GRP_2);
> +	acp63_writel(PAGE_SIZE_4K_ENABLE, sdw_ins->acp_base +
> +		     ACPAXI2AXI_ATU_PAGE_SIZE_GRP_2);
> +	for (page_idx = 0; page_idx < sdw_ins->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);
> +
> +		acp63_writel(low, sdw_ins->acp_base + ACP_SCRATCH_REG_0 + val);
> +		high |= BIT(31);
> +		acp63_writel(high, sdw_ins->acp_base + ACP_SCRATCH_REG_0 + val + 4);
> +		val += 8;
> +		addr += PAGE_SIZE;
> +	}
> +
> +	/*cache Invalidation added for Testing */

/* cache

> +	acp63_writel(0x1, sdw_ins->acp_base + ACPAXI2AXI_ATU_CTRL);
> +}

> +static int acp63_sdw_dma_hw_params(struct snd_soc_component *component,
> +				   struct snd_pcm_substream *substream,
> +				   struct snd_pcm_hw_params *params)
> +{
> +	struct sdw_stream_instance *sdw_stream_data;
> +	struct sdw_dma_dev_data *sdw_data;
> +	u32 period_bytes;
> +	u32 water_mark_size_reg;
> +	u32 irq_mask, ext_intr_ctrl;
> +	u64 size;
> +	u32 stream_id;
> +	u32 acp_ext_intr_cntl_reg;
> +	int ret;
> +
> +	stream_id = 0;

useless initialization...

> +	sdw_data = dev_get_drvdata(component->dev);
> +	sdw_stream_data = substream->runtime->private_data;
> +	if (!sdw_stream_data)
> +		return -EINVAL;
> +	stream_id = sdw_stream_data->stream_id;

... overriden here

> +	sdw_data->sdw_stream[stream_id] = substream;
> +	size = params_buffer_bytes(params);
> +	period_bytes = params_period_bytes(params);
> +	sdw_stream_data->dma_addr = substream->runtime->dma_addr;
> +	sdw_stream_data->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
> +	acp63_config_dma(sdw_stream_data, stream_id);
> +	ret = acp63_configure_sdw_ringbuffer(sdw_stream_data->acp_base, stream_id, size);
> +	if (ret) {
> +		dev_err(component->dev, "Invalid channel type\n");
> +		return -EINVAL;
> +	}
> +	switch (stream_id) {
> +	case ACP_SDW_AUDIO_TX:
> +		water_mark_size_reg = ACP_AUDIO_TX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_AUDIO_TX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL;
> +		break;

so there's ONE resource to deal with external codecs? How does this work
if you have a headset codec and an amplifier?

> +	case ACP_SDW_BT_TX:
> +		water_mark_size_reg = ACP_BT_TX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_BT_TX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL;
> +		break;
> +	case ACP_SDW_HS_TX:
> +		water_mark_size_reg = ACP_HS_TX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_HS_TX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL;
> +		break;
> +	case ACP_SDW1_BT_TX:
> +		water_mark_size_reg = ACP_P1_BT_TX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_P1_BT_TX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL1;
> +		break;
> +	case ACP_SDW_AUDIO_RX:
> +		water_mark_size_reg = ACP_AUDIO_RX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_AUDIO_RX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL;
> +		break;
> +	case ACP_SDW_BT_RX:
> +		water_mark_size_reg = ACP_BT_RX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_BT_RX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL;
> +		break;
> +	case ACP_SDW_HS_RX:
> +		water_mark_size_reg = ACP_HS_RX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_HS_RX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL;
> +		break;
> +	case ACP_SDW1_BT_RX:
> +		water_mark_size_reg = ACP_P1_BT_RX_INTR_WATERMARK_SIZE;
> +		irq_mask = BIT(ACP_P1_BT_RX_THRESHOLD);
> +		acp_ext_intr_cntl_reg = ACP_EXTERNAL_INTR_CNTL1;
> +		break;
> +	default:
> +		dev_err(component->dev, "%s: Invalid channel type\n", __func__);
> +		return -EINVAL;
> +	}
> +
> +	ext_intr_ctrl = acp63_readl(sdw_stream_data->acp_base + acp_ext_intr_cntl_reg);
> +	ext_intr_ctrl |= irq_mask;
> +	acp63_writel(ext_intr_ctrl, sdw_stream_data->acp_base + acp_ext_intr_cntl_reg);
> +	acp63_writel(period_bytes, sdw_stream_data->acp_base + water_mark_size_reg);
> +	return 0;
> +}