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Diffstat (limited to 'sound/soc/amd/yc/acp6x-pdm-dma.c')
-rw-r--r--sound/soc/amd/yc/acp6x-pdm-dma.c449
1 files changed, 449 insertions, 0 deletions
diff --git a/sound/soc/amd/yc/acp6x-pdm-dma.c b/sound/soc/amd/yc/acp6x-pdm-dma.c
new file mode 100644
index 000000000..acecd6a4e
--- /dev/null
+++ b/sound/soc/amd/yc/acp6x-pdm-dma.c
@@ -0,0 +1,449 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AMD ALSA SoC Yellow Carp PDM Driver
+ *
+ * Copyright 2021 Advanced Micro Devices, Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+#include <linux/pm_runtime.h>
+
+#include "acp6x.h"
+
+#define DRV_NAME "acp_yc_pdm_dma"
+
+static const struct snd_pcm_hardware acp6x_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 void acp6x_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
+ u32 watermark_size, void __iomem *acp_base)
+{
+ acp6x_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
+ acp6x_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
+ acp6x_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
+ acp6x_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
+}
+
+static void acp6x_enable_pdm_clock(void __iomem *acp_base)
+{
+ u32 pdm_clk_enable, pdm_ctrl;
+
+ pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
+ pdm_ctrl = 0x00;
+
+ acp6x_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
+ pdm_ctrl = acp6x_readl(acp_base + ACP_WOV_MISC_CTRL);
+ pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK;
+ acp6x_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
+}
+
+static void acp6x_enable_pdm_interrupts(void __iomem *acp_base)
+{
+ u32 ext_int_ctrl;
+
+ ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
+ ext_int_ctrl |= PDM_DMA_INTR_MASK;
+ acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
+}
+
+static void acp6x_disable_pdm_interrupts(void __iomem *acp_base)
+{
+ u32 ext_int_ctrl;
+
+ ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
+ ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
+ acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
+}
+
+static bool acp6x_check_pdm_dma_status(void __iomem *acp_base)
+{
+ bool pdm_dma_status;
+ u32 pdm_enable, pdm_dma_enable;
+
+ pdm_dma_status = false;
+ pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
+ pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
+ if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
+ pdm_dma_status = true;
+
+ return pdm_dma_status;
+}
+
+static int acp6x_start_pdm_dma(void __iomem *acp_base)
+{
+ u32 pdm_enable;
+ u32 pdm_dma_enable;
+ int timeout;
+
+ pdm_enable = 0x01;
+ pdm_dma_enable = 0x01;
+
+ acp6x_enable_pdm_clock(acp_base);
+ acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
+ acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
+ timeout = 0;
+ while (++timeout < ACP_COUNTER) {
+ pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
+ if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
+ return 0;
+ udelay(DELAY_US);
+ }
+ return -ETIMEDOUT;
+}
+
+static int acp6x_stop_pdm_dma(void __iomem *acp_base)
+{
+ u32 pdm_enable, pdm_dma_enable;
+ int timeout;
+
+ pdm_enable = 0x00;
+ pdm_dma_enable = 0x00;
+
+ pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
+ pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
+ if (pdm_dma_enable & 0x01) {
+ pdm_dma_enable = 0x02;
+ acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
+ timeout = 0;
+ while (++timeout < ACP_COUNTER) {
+ pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
+ if ((pdm_dma_enable & 0x02) == 0x00)
+ break;
+ udelay(DELAY_US);
+ }
+ if (timeout == ACP_COUNTER)
+ return -ETIMEDOUT;
+ }
+ if (pdm_enable == ACP_PDM_ENABLE) {
+ pdm_enable = ACP_PDM_DISABLE;
+ acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
+ }
+ acp6x_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
+ return 0;
+}
+
+static void acp6x_config_dma(struct pdm_stream_instance *rtd, int direction)
+{
+ u16 page_idx;
+ u32 low, high, val;
+ dma_addr_t addr;
+
+ addr = rtd->dma_addr;
+ val = PDM_PTE_OFFSET;
+
+ /* Group Enable */
+ acp6x_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp6x_base +
+ ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
+ acp6x_writel(PAGE_SIZE_4K_ENABLE, rtd->acp6x_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);
+
+ acp6x_writel(low, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val);
+ high |= BIT(31);
+ acp6x_writel(high, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val + 4);
+ val += 8;
+ addr += PAGE_SIZE;
+ }
+}
+
+static int acp6x_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 = acp6x_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;
+ }
+
+ acp6x_enable_pdm_interrupts(adata->acp6x_base);
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ adata->capture_stream = substream;
+
+ pdm_data->acp6x_base = adata->acp6x_base;
+ runtime->private_data = pdm_data;
+ return ret;
+}
+
+static int acp6x_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->runtime->dma_addr;
+ rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
+ acp6x_config_dma(rtd, substream->stream);
+ acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
+ period_bytes, rtd->acp6x_base);
+ return 0;
+}
+
+static u64 acp6x_pdm_get_byte_count(struct pdm_stream_instance *rtd,
+ int direction)
+{
+ union acp_pdm_dma_count byte_count;
+
+ byte_count.bcount.high =
+ acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
+ byte_count.bcount.low =
+ acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
+ return byte_count.bytescount;
+}
+
+static snd_pcm_uframes_t acp6x_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 = acp6x_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 acp6x_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 acp6x_pdm_dma_close(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
+
+ acp6x_disable_pdm_interrupts(adata->acp6x_base);
+ adata->capture_stream = NULL;
+ return 0;
+}
+
+static int acp6x_pdm_dai_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ struct pdm_stream_instance *rtd;
+ int ret;
+ bool pdm_status;
+ unsigned int ch_mask;
+
+ rtd = substream->runtime->private_data;
+ ret = 0;
+ switch (substream->runtime->channels) {
+ case TWO_CH:
+ ch_mask = 0x00;
+ break;
+ default:
+ return -EINVAL;
+ }
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ acp6x_writel(ch_mask, rtd->acp6x_base + ACP_WOV_PDM_NO_OF_CHANNELS);
+ acp6x_writel(PDM_DECIMATION_FACTOR, rtd->acp6x_base +
+ ACP_WOV_PDM_DECIMATION_FACTOR);
+ rtd->bytescount = acp6x_pdm_get_byte_count(rtd, substream->stream);
+ pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
+ if (!pdm_status)
+ ret = acp6x_start_pdm_dma(rtd->acp6x_base);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
+ if (pdm_status)
+ ret = acp6x_stop_pdm_dma(rtd->acp6x_base);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static const struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
+ .trigger = acp6x_pdm_dai_trigger,
+};
+
+static struct snd_soc_dai_driver acp6x_pdm_dai_driver = {
+ .capture = {
+ .rates = SNDRV_PCM_RATE_48000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ .channels_min = 2,
+ .channels_max = 2,
+ .rate_min = 48000,
+ .rate_max = 48000,
+ },
+ .ops = &acp6x_pdm_dai_ops,
+};
+
+static const struct snd_soc_component_driver acp6x_pdm_component = {
+ .name = DRV_NAME,
+ .open = acp6x_pdm_dma_open,
+ .close = acp6x_pdm_dma_close,
+ .hw_params = acp6x_pdm_dma_hw_params,
+ .pointer = acp6x_pdm_dma_pointer,
+ .pcm_construct = acp6x_pdm_dma_new,
+ .legacy_dai_naming = 1,
+};
+
+static int acp6x_pdm_audio_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct pdm_dev_data *adata;
+ int status;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
+ return -ENODEV;
+ }
+
+ adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
+ if (!adata)
+ return -ENOMEM;
+
+ adata->acp6x_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!adata->acp6x_base)
+ return -ENOMEM;
+
+ adata->capture_stream = NULL;
+
+ dev_set_drvdata(&pdev->dev, adata);
+ status = devm_snd_soc_register_component(&pdev->dev,
+ &acp6x_pdm_component,
+ &acp6x_pdm_dai_driver, 1);
+ if (status) {
+ dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
+
+ return -ENODEV;
+ }
+ pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
+ return 0;
+}
+
+static int acp6x_pdm_audio_remove(struct platform_device *pdev)
+{
+ pm_runtime_disable(&pdev->dev);
+ return 0;
+}
+
+static int __maybe_unused acp6x_pdm_resume(struct device *dev)
+{
+ struct pdm_dev_data *adata;
+ struct snd_pcm_runtime *runtime;
+ struct pdm_stream_instance *rtd;
+ u32 period_bytes, buffer_len;
+
+ adata = dev_get_drvdata(dev);
+ if (adata->capture_stream && adata->capture_stream->runtime) {
+ runtime = adata->capture_stream->runtime;
+ rtd = runtime->private_data;
+ period_bytes = frames_to_bytes(runtime, runtime->period_size);
+ buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
+ acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
+ acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
+ period_bytes, adata->acp6x_base);
+ }
+ acp6x_enable_pdm_interrupts(adata->acp6x_base);
+ return 0;
+}
+
+static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
+{
+ struct pdm_dev_data *adata;
+
+ adata = dev_get_drvdata(dev);
+ acp6x_disable_pdm_interrupts(adata->acp6x_base);
+ return 0;
+}
+
+static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
+{
+ struct pdm_dev_data *adata;
+
+ adata = dev_get_drvdata(dev);
+ acp6x_enable_pdm_interrupts(adata->acp6x_base);
+ return 0;
+}
+
+static const struct dev_pm_ops acp6x_pdm_pm_ops = {
+ SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
+};
+
+static struct platform_driver acp6x_pdm_dma_driver = {
+ .probe = acp6x_pdm_audio_probe,
+ .remove = acp6x_pdm_audio_remove,
+ .driver = {
+ .name = "acp_yc_pdm_dma",
+ .pm = &acp6x_pdm_pm_ops,
+ },
+};
+
+module_platform_driver(acp6x_pdm_dma_driver);
+
+MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
+MODULE_DESCRIPTION("AMD ACP6x YC PDM Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);