ASoC: amd: add acp3x pdm driver dma ops

This patch adds PDM driver DMA operations.

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

diff --git a/sound/soc/amd/renoir/acp3x-pdm-dma.c b/sound/soc/amd/renoir/acp3x-pdm-dma.c
index fdac2c1e3acd52328572fb133815acb9e91f8c37..8bb03fa5b4a5c7847652531ac64b93eb8fa3dab6 100644 (file)
--- a/sound/soc/amd/renoir/acp3x-pdm-dma.c
+++ b/sound/soc/amd/renoir/acp3x-pdm-dma.c
@@ -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)

diff --git a/sound/soc/amd/renoir/rn_acp3x.h b/sound/soc/amd/renoir/rn_acp3x.h
index 1ad8a7845fdaeb5b4210a1ed1d766715f3714008..3536d24374f377f05200693003c0f727c5bdfac9 100644 (file)
--- a/sound/soc/amd/renoir/rn_acp3x.h
+++ b/sound/soc/amd/renoir/rn_acp3x.h
@@ -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);