@@ -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)
@@ -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);