// 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 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, }; 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);