| // 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); |