[PATCH 06/11] ASoC: amd: add acp3x pcm driver dma ops

[Vijendar Mukunda]

ACP3x has a DMA controller to access system memory.
This controller transfers data from/to system memory
to/from the ACP internal FIFO.
The patch adds PCM driver DMA operations.

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@xxxxxxx>
Tested-by: Ravulapati Vishnu vardhan Rao <Vishnuvardhanrao.Ravulapati@xxxxxxx>
Signed-off-by: Vijendar Mukunda <vijendar.mukunda@xxxxxxx>
---
 sound/soc/amd/raven/acp3x-pcm-dma.c | 262 +++++++++++++++++++++++++++++++++++-
 sound/soc/amd/raven/acp3x.h         |  20 +++
 2 files changed, 275 insertions(+), 7 deletions(-)

diff --git a/sound/soc/amd/raven/acp3x-pcm-dma.c b/sound/soc/amd/raven/acp3x-pcm-dma.c
index 94f915a..06c1985 100644
--- a/sound/soc/amd/raven/acp3x-pcm-dma.c
+++ b/sound/soc/amd/raven/acp3x-pcm-dma.c
@@ -33,6 +33,54 @@ struct i2s_dev_data {
 	struct snd_pcm_substream *capture_stream;
 };
 
+struct i2s_stream_instance {
+	u16 num_pages;
+	u16 channels;
+	u32 xfer_resolution;
+	struct page *pg;
+	void __iomem *acp3x_base;
+};
+
+static const struct snd_pcm_hardware acp3x_pcm_hardware_playback = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_BATCH |
+		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 = 8,
+	.rates = SNDRV_PCM_RATE_8000_96000,
+	.rate_min = 8000,
+	.rate_max = 96000,
+	.buffer_bytes_max = PLAYBACK_MAX_NUM_PERIODS * PLAYBACK_MAX_PERIOD_SIZE,
+	.period_bytes_min = PLAYBACK_MIN_PERIOD_SIZE,
+	.period_bytes_max = PLAYBACK_MAX_PERIOD_SIZE,
+	.periods_min = PLAYBACK_MIN_NUM_PERIODS,
+	.periods_max = PLAYBACK_MAX_NUM_PERIODS,
+};
+
+static const struct snd_pcm_hardware acp3x_pcm_hardware_capture = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_BATCH |
+	    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_8000_48000,
+	.rate_min = 8000,
+	.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 int acp3x_power_on(void __iomem *acp3x_base, bool on)
 {
 	u16 val, mask;
@@ -165,14 +213,214 @@ static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
 		return IRQ_NONE;
 }
 
+static void config_acp3x_dma(struct i2s_stream_instance *rtd, int direction)
+{
+	u16 page_idx;
+	u64 addr;
+	u32 low, high, val, acp_fifo_addr;
+	struct page *pg = rtd->pg;
+
+	/* 8 scratch registers used to map one 64 bit address */
+	if (direction == SNDRV_PCM_STREAM_PLAYBACK)
+		val = 0;
+	else
+		val = rtd->num_pages * 8;
+
+	/* Group Enable */
+	rv_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp3x_base +
+		  mmACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
+	rv_writel(PAGE_SIZE_4K_ENABLE, rtd->acp3x_base +
+		  mmACPAXI2AXI_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 */
+		addr = page_to_phys(pg);
+		low = lower_32_bits(addr);
+		high = upper_32_bits(addr);
+
+		rv_writel(low, rtd->acp3x_base + mmACP_SCRATCH_REG_0 + val);
+		high |= BIT(31);
+		rv_writel(high, rtd->acp3x_base + mmACP_SCRATCH_REG_0 + val
+				+ 4);
+		/* Move to next physically contiguos page */
+		val += 8;
+		pg++;
+	}
+
+	if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
+		/* Config ringbuffer */
+		rv_writel(MEM_WINDOW_START, rtd->acp3x_base +
+			  mmACP_BT_TX_RINGBUFADDR);
+		rv_writel(MAX_BUFFER, rtd->acp3x_base +
+			  mmACP_BT_TX_RINGBUFSIZE);
+		rv_writel(DMA_SIZE, rtd->acp3x_base + mmACP_BT_TX_DMA_SIZE);
+
+		/* Config audio fifo */
+		acp_fifo_addr = ACP_SRAM_PTE_OFFSET + (rtd->num_pages * 8)
+				+ PLAYBACK_FIFO_ADDR_OFFSET;
+		rv_writel(acp_fifo_addr, rtd->acp3x_base +
+			  mmACP_BT_TX_FIFOADDR);
+		rv_writel(FIFO_SIZE, rtd->acp3x_base + mmACP_BT_TX_FIFOSIZE);
+	} else {
+		/* Config ringbuffer */
+		rv_writel(MEM_WINDOW_START + MAX_BUFFER, rtd->acp3x_base +
+			  mmACP_BT_RX_RINGBUFADDR);
+		rv_writel(MAX_BUFFER, rtd->acp3x_base +
+			  mmACP_BT_RX_RINGBUFSIZE);
+		rv_writel(DMA_SIZE, rtd->acp3x_base + mmACP_BT_RX_DMA_SIZE);
+
+		/* Config audio fifo */
+		acp_fifo_addr = ACP_SRAM_PTE_OFFSET +
+				(rtd->num_pages * 8) + CAPTURE_FIFO_ADDR_OFFSET;
+		rv_writel(acp_fifo_addr, rtd->acp3x_base +
+			  mmACP_BT_RX_FIFOADDR);
+		rv_writel(FIFO_SIZE, rtd->acp3x_base + mmACP_BT_RX_FIFOSIZE);
+	}
+
+	/* Enable  watermark/period interrupt to host */
+	rv_writel(BIT(BT_TX_THRESHOLD) | BIT(BT_RX_THRESHOLD),
+		  rtd->acp3x_base + mmACP_EXTERNAL_INTR_CNTL);
+}
+
+static int acp3x_dma_open(struct snd_pcm_substream *substream)
+{
+	int ret = 0;
+
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *prtd = substream->private_data;
+	struct snd_soc_component *component = snd_soc_rtdcom_lookup(prtd,
+								    DRV_NAME);
+	struct i2s_dev_data *adata = dev_get_drvdata(component->dev);
+
+	struct i2s_stream_instance *i2s_data = kzalloc(sizeof(struct i2s_stream_instance),
+						       GFP_KERNEL);
+	if (!i2s_data)
+		return -EINVAL;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		runtime->hw = acp3x_pcm_hardware_playback;
+	else
+		runtime->hw = acp3x_pcm_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");
+		return ret;
+	}
+
+	if (!adata->play_stream && !adata->capture_stream)
+		rv_writel(1, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		adata->play_stream = substream;
+	else
+		adata->capture_stream = substream;
+
+	i2s_data->acp3x_base = adata->acp3x_base;
+	runtime->private_data = i2s_data;
+	return 0;
+}
+
+static int acp3x_dma_hw_params(struct snd_pcm_substream *substream,
+			       struct snd_pcm_hw_params *params)
+{
+	int status;
+	u64 size;
+	struct snd_dma_buffer *dma_buffer;
+	struct page *pg;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct i2s_stream_instance *rtd = runtime->private_data;
+
+	if (!rtd)
+		return -EINVAL;
+
+	dma_buffer = &substream->dma_buffer;
+	size = params_buffer_bytes(params);
+	status = snd_pcm_lib_malloc_pages(substream, size);
+	if (status < 0)
+		return status;
+
+	memset(substream->runtime->dma_area, 0, params_buffer_bytes(params));
+	pg = virt_to_page(substream->dma_buffer.area);
+	if (pg) {
+		rtd->pg = pg;
+		rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
+		config_acp3x_dma(rtd, substream->stream);
+		status = 0;
+	} else {
+		status = -ENOMEM;
+	}
+	return status;
+}
+
+static snd_pcm_uframes_t acp3x_dma_pointer(struct snd_pcm_substream *substream)
+{
+	u32 pos = 0;
+	struct i2s_stream_instance *rtd = substream->runtime->private_data;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		pos = rv_readl(rtd->acp3x_base +
+			       mmACP_BT_TX_LINKPOSITIONCNTR);
+	else
+		pos = rv_readl(rtd->acp3x_base +
+			       mmACP_BT_RX_LINKPOSITIONCNTR);
+
+	if (pos >= MAX_BUFFER)
+		pos = 0;
+
+	return bytes_to_frames(substream->runtime, pos);
+}
+
+static int acp3x_dma_new(struct snd_soc_pcm_runtime *rtd)
+{
+	return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
+						     SNDRV_DMA_TYPE_DEV,
+						     NULL, MIN_BUFFER,
+						     MAX_BUFFER);
+}
+
+static int acp3x_dma_hw_free(struct snd_pcm_substream *substream)
+{
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int acp3x_dma_mmap(struct snd_pcm_substream *substream,
+			  struct vm_area_struct *vma)
+{
+	return snd_pcm_lib_default_mmap(substream, vma);
+}
+
+static int acp3x_dma_close(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *prtd = substream->private_data;
+	struct i2s_stream_instance *rtd = substream->runtime->private_data;
+	struct snd_soc_component *component = snd_soc_rtdcom_lookup(prtd,
+								    DRV_NAME);
+	struct i2s_dev_data *adata = dev_get_drvdata(component->dev);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		adata->play_stream = NULL;
+	else
+		adata->capture_stream = NULL;
+
+	/* Disable ACP irq, when the current stream is being closed and
+	 * another stream is also not active.
+	 */
+	if (!adata->play_stream && !adata->capture_stream)
+		rv_writel(0, adata->acp3x_base + mmACP_EXTERNAL_INTR_ENB);
+	kfree(rtd);
+	return 0;
+}
+
 static struct snd_pcm_ops acp3x_dma_ops = {
-	.open = NULL,
-	.close = NULL,
-	.ioctl = NULL,
-	.hw_params = NULL,
-	.hw_free = NULL,
-	.pointer = NULL,
-	.mmap = NULL,
+	.open = acp3x_dma_open,
+	.close = acp3x_dma_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = acp3x_dma_hw_params,
+	.hw_free = acp3x_dma_hw_free,
+	.pointer = acp3x_dma_pointer,
+	.mmap = acp3x_dma_mmap,
 };
 
 struct snd_soc_dai_ops acp3x_dai_i2s_ops = {
diff --git a/sound/soc/amd/raven/acp3x.h b/sound/soc/amd/raven/acp3x.h
index f3d3e51..9f33e34 100644
--- a/sound/soc/amd/raven/acp3x.h
+++ b/sound/soc/amd/raven/acp3x.h
@@ -13,6 +13,26 @@
 #define ACP3x_POWER_OFF_IN_PROGRESS 0x03
 #define ACP3x_SOFT_RESET__SoftResetAudDone_MASK	0x00010001
 
+#define ACP_SRAM_PTE_OFFSET	0x02050000
+#define PAGE_SIZE_4K_ENABLE 0x2
+#define MEM_WINDOW_START	0x4000000
+#define PLAYBACK_FIFO_ADDR_OFFSET 0x400
+#define CAPTURE_FIFO_ADDR_OFFSET  0x500
+
+#define PLAYBACK_MIN_NUM_PERIODS    2
+#define PLAYBACK_MAX_NUM_PERIODS    8
+#define PLAYBACK_MAX_PERIOD_SIZE    16384
+#define PLAYBACK_MIN_PERIOD_SIZE    4096
+#define CAPTURE_MIN_NUM_PERIODS     2
+#define CAPTURE_MAX_NUM_PERIODS     8
+#define CAPTURE_MAX_PERIOD_SIZE     16384
+#define CAPTURE_MIN_PERIOD_SIZE     4096
+
+#define MAX_BUFFER (PLAYBACK_MAX_PERIOD_SIZE * PLAYBACK_MAX_NUM_PERIODS)
+#define MIN_BUFFER MAX_BUFFER
+#define FIFO_SIZE 0x100
+#define DMA_SIZE 0x40
+
 static inline u32 rv_readl(void __iomem *base_addr)
 {
 	return readl(base_addr - ACP3x_PHY_BASE_ADDRESS);
-- 
2.7.4