450 lines
12 KiB
C
450 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* AMD ALSA SoC Yellow Carp PDM Driver
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*
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* Copyright 2021 Advanced Micro Devices, Inc.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/soc-dai.h>
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#include <linux/pm_runtime.h>
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#include "acp6x.h"
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#define DRV_NAME "acp_yc_pdm_dma"
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static const struct snd_pcm_hardware acp6x_pdm_hardware_capture = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S32_LE,
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.channels_min = 2,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_48000,
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.rate_min = 48000,
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.rate_max = 48000,
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.buffer_bytes_max = CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE,
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.period_bytes_min = CAPTURE_MIN_PERIOD_SIZE,
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.period_bytes_max = CAPTURE_MAX_PERIOD_SIZE,
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.periods_min = CAPTURE_MIN_NUM_PERIODS,
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.periods_max = CAPTURE_MAX_NUM_PERIODS,
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};
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static void acp6x_init_pdm_ring_buffer(u32 physical_addr, u32 buffer_size,
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u32 watermark_size, void __iomem *acp_base)
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{
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acp6x_writel(physical_addr, acp_base + ACP_WOV_RX_RINGBUFADDR);
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acp6x_writel(buffer_size, acp_base + ACP_WOV_RX_RINGBUFSIZE);
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acp6x_writel(watermark_size, acp_base + ACP_WOV_RX_INTR_WATERMARK_SIZE);
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acp6x_writel(0x01, acp_base + ACPAXI2AXI_ATU_CTRL);
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}
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static void acp6x_enable_pdm_clock(void __iomem *acp_base)
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{
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u32 pdm_clk_enable, pdm_ctrl;
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pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
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pdm_ctrl = 0x00;
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acp6x_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
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pdm_ctrl = acp6x_readl(acp_base + ACP_WOV_MISC_CTRL);
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pdm_ctrl |= ACP_WOV_MISC_CTRL_MASK;
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acp6x_writel(pdm_ctrl, acp_base + ACP_WOV_MISC_CTRL);
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}
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static void acp6x_enable_pdm_interrupts(void __iomem *acp_base)
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{
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u32 ext_int_ctrl;
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ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
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ext_int_ctrl |= PDM_DMA_INTR_MASK;
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acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
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}
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static void acp6x_disable_pdm_interrupts(void __iomem *acp_base)
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{
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u32 ext_int_ctrl;
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ext_int_ctrl = acp6x_readl(acp_base + ACP_EXTERNAL_INTR_CNTL);
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ext_int_ctrl &= ~PDM_DMA_INTR_MASK;
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acp6x_writel(ext_int_ctrl, acp_base + ACP_EXTERNAL_INTR_CNTL);
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}
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static bool acp6x_check_pdm_dma_status(void __iomem *acp_base)
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{
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bool pdm_dma_status;
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u32 pdm_enable, pdm_dma_enable;
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pdm_dma_status = false;
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pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
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pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
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if ((pdm_enable & ACP_PDM_ENABLE) && (pdm_dma_enable & ACP_PDM_DMA_EN_STATUS))
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pdm_dma_status = true;
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return pdm_dma_status;
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}
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static int acp6x_start_pdm_dma(void __iomem *acp_base)
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{
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u32 pdm_enable;
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u32 pdm_dma_enable;
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int timeout;
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pdm_enable = 0x01;
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pdm_dma_enable = 0x01;
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acp6x_enable_pdm_clock(acp_base);
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acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
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acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
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timeout = 0;
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while (++timeout < ACP_COUNTER) {
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pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
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if ((pdm_dma_enable & 0x02) == ACP_PDM_DMA_EN_STATUS)
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return 0;
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udelay(DELAY_US);
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}
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return -ETIMEDOUT;
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}
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static int acp6x_stop_pdm_dma(void __iomem *acp_base)
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{
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u32 pdm_enable, pdm_dma_enable;
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int timeout;
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pdm_enable = 0x00;
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pdm_dma_enable = 0x00;
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pdm_enable = acp6x_readl(acp_base + ACP_WOV_PDM_ENABLE);
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pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
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if (pdm_dma_enable & 0x01) {
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pdm_dma_enable = 0x02;
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acp6x_writel(pdm_dma_enable, acp_base + ACP_WOV_PDM_DMA_ENABLE);
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timeout = 0;
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while (++timeout < ACP_COUNTER) {
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pdm_dma_enable = acp6x_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
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if ((pdm_dma_enable & 0x02) == 0x00)
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break;
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udelay(DELAY_US);
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}
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if (timeout == ACP_COUNTER)
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return -ETIMEDOUT;
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}
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if (pdm_enable == ACP_PDM_ENABLE) {
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pdm_enable = ACP_PDM_DISABLE;
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acp6x_writel(pdm_enable, acp_base + ACP_WOV_PDM_ENABLE);
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}
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acp6x_writel(0x01, acp_base + ACP_WOV_PDM_FIFO_FLUSH);
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return 0;
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}
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static void acp6x_config_dma(struct pdm_stream_instance *rtd, int direction)
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{
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u16 page_idx;
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u32 low, high, val;
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dma_addr_t addr;
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addr = rtd->dma_addr;
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val = PDM_PTE_OFFSET;
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/* Group Enable */
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acp6x_writel(ACP_SRAM_PTE_OFFSET | BIT(31), rtd->acp6x_base +
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ACPAXI2AXI_ATU_BASE_ADDR_GRP_1);
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acp6x_writel(PAGE_SIZE_4K_ENABLE, rtd->acp6x_base +
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ACPAXI2AXI_ATU_PAGE_SIZE_GRP_1);
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for (page_idx = 0; page_idx < rtd->num_pages; page_idx++) {
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/* Load the low address of page int ACP SRAM through SRBM */
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low = lower_32_bits(addr);
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high = upper_32_bits(addr);
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acp6x_writel(low, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val);
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high |= BIT(31);
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acp6x_writel(high, rtd->acp6x_base + ACP_SCRATCH_REG_0 + val + 4);
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val += 8;
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addr += PAGE_SIZE;
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}
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}
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static int acp6x_pdm_dma_open(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime;
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struct pdm_dev_data *adata;
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struct pdm_stream_instance *pdm_data;
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int ret;
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runtime = substream->runtime;
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adata = dev_get_drvdata(component->dev);
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pdm_data = kzalloc(sizeof(*pdm_data), GFP_KERNEL);
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if (!pdm_data)
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return -EINVAL;
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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runtime->hw = acp6x_pdm_hardware_capture;
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0) {
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dev_err(component->dev, "set integer constraint failed\n");
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kfree(pdm_data);
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return ret;
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}
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acp6x_enable_pdm_interrupts(adata->acp6x_base);
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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adata->capture_stream = substream;
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pdm_data->acp6x_base = adata->acp6x_base;
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runtime->private_data = pdm_data;
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return ret;
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}
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static int acp6x_pdm_dma_hw_params(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct pdm_stream_instance *rtd;
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size_t size, period_bytes;
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rtd = substream->runtime->private_data;
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if (!rtd)
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return -EINVAL;
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size = params_buffer_bytes(params);
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period_bytes = params_period_bytes(params);
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rtd->dma_addr = substream->runtime->dma_addr;
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rtd->num_pages = (PAGE_ALIGN(size) >> PAGE_SHIFT);
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acp6x_config_dma(rtd, substream->stream);
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acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, size,
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period_bytes, rtd->acp6x_base);
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return 0;
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}
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static u64 acp6x_pdm_get_byte_count(struct pdm_stream_instance *rtd,
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int direction)
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{
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union acp_pdm_dma_count byte_count;
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byte_count.bcount.high =
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acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_HIGH);
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byte_count.bcount.low =
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acp6x_readl(rtd->acp6x_base + ACP_WOV_RX_LINEARPOSITIONCNTR_LOW);
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return byte_count.bytescount;
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}
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static snd_pcm_uframes_t acp6x_pdm_dma_pointer(struct snd_soc_component *comp,
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struct snd_pcm_substream *stream)
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{
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struct pdm_stream_instance *rtd;
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u32 pos, buffersize;
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u64 bytescount;
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rtd = stream->runtime->private_data;
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buffersize = frames_to_bytes(stream->runtime,
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stream->runtime->buffer_size);
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bytescount = acp6x_pdm_get_byte_count(rtd, stream->stream);
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if (bytescount > rtd->bytescount)
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bytescount -= rtd->bytescount;
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pos = do_div(bytescount, buffersize);
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return bytes_to_frames(stream->runtime, pos);
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}
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static int acp6x_pdm_dma_new(struct snd_soc_component *component,
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struct snd_soc_pcm_runtime *rtd)
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{
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struct device *parent = component->dev->parent;
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snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
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parent, MIN_BUFFER, MAX_BUFFER);
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return 0;
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}
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static int acp6x_pdm_dma_close(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
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acp6x_disable_pdm_interrupts(adata->acp6x_base);
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adata->capture_stream = NULL;
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return 0;
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}
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static int acp6x_pdm_dai_trigger(struct snd_pcm_substream *substream,
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int cmd, struct snd_soc_dai *dai)
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{
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struct pdm_stream_instance *rtd;
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int ret;
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bool pdm_status;
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unsigned int ch_mask;
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rtd = substream->runtime->private_data;
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ret = 0;
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switch (substream->runtime->channels) {
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case TWO_CH:
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ch_mask = 0x00;
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break;
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default:
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return -EINVAL;
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}
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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acp6x_writel(ch_mask, rtd->acp6x_base + ACP_WOV_PDM_NO_OF_CHANNELS);
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acp6x_writel(PDM_DECIMATION_FACTOR, rtd->acp6x_base +
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ACP_WOV_PDM_DECIMATION_FACTOR);
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rtd->bytescount = acp6x_pdm_get_byte_count(rtd, substream->stream);
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pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
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if (!pdm_status)
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ret = acp6x_start_pdm_dma(rtd->acp6x_base);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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pdm_status = acp6x_check_pdm_dma_status(rtd->acp6x_base);
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if (pdm_status)
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ret = acp6x_stop_pdm_dma(rtd->acp6x_base);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static const struct snd_soc_dai_ops acp6x_pdm_dai_ops = {
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.trigger = acp6x_pdm_dai_trigger,
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};
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static struct snd_soc_dai_driver acp6x_pdm_dai_driver = {
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.capture = {
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.rates = SNDRV_PCM_RATE_48000,
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.formats = SNDRV_PCM_FMTBIT_S32_LE,
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.channels_min = 2,
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.channels_max = 2,
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.rate_min = 48000,
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.rate_max = 48000,
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},
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.ops = &acp6x_pdm_dai_ops,
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};
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static const struct snd_soc_component_driver acp6x_pdm_component = {
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.name = DRV_NAME,
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.open = acp6x_pdm_dma_open,
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.close = acp6x_pdm_dma_close,
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.hw_params = acp6x_pdm_dma_hw_params,
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.pointer = acp6x_pdm_dma_pointer,
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.pcm_construct = acp6x_pdm_dma_new,
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.legacy_dai_naming = 1,
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};
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static int acp6x_pdm_audio_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct pdm_dev_data *adata;
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int status;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "IORESOURCE_MEM FAILED\n");
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return -ENODEV;
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}
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adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
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if (!adata)
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return -ENOMEM;
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adata->acp6x_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
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if (!adata->acp6x_base)
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return -ENOMEM;
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adata->capture_stream = NULL;
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dev_set_drvdata(&pdev->dev, adata);
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status = devm_snd_soc_register_component(&pdev->dev,
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&acp6x_pdm_component,
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&acp6x_pdm_dai_driver, 1);
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if (status) {
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dev_err(&pdev->dev, "Fail to register acp pdm dai\n");
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return -ENODEV;
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}
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pm_runtime_set_autosuspend_delay(&pdev->dev, ACP_SUSPEND_DELAY_MS);
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pm_runtime_use_autosuspend(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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pm_runtime_allow(&pdev->dev);
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return 0;
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}
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static int acp6x_pdm_audio_remove(struct platform_device *pdev)
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{
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static int __maybe_unused acp6x_pdm_resume(struct device *dev)
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{
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struct pdm_dev_data *adata;
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struct snd_pcm_runtime *runtime;
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struct pdm_stream_instance *rtd;
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u32 period_bytes, buffer_len;
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adata = dev_get_drvdata(dev);
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if (adata->capture_stream && adata->capture_stream->runtime) {
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runtime = adata->capture_stream->runtime;
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rtd = runtime->private_data;
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period_bytes = frames_to_bytes(runtime, runtime->period_size);
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buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
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acp6x_config_dma(rtd, SNDRV_PCM_STREAM_CAPTURE);
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acp6x_init_pdm_ring_buffer(PDM_MEM_WINDOW_START, buffer_len,
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period_bytes, adata->acp6x_base);
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}
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acp6x_enable_pdm_interrupts(adata->acp6x_base);
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return 0;
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}
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static int __maybe_unused acp6x_pdm_suspend(struct device *dev)
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{
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struct pdm_dev_data *adata;
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adata = dev_get_drvdata(dev);
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acp6x_disable_pdm_interrupts(adata->acp6x_base);
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return 0;
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}
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static int __maybe_unused acp6x_pdm_runtime_resume(struct device *dev)
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{
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struct pdm_dev_data *adata;
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adata = dev_get_drvdata(dev);
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acp6x_enable_pdm_interrupts(adata->acp6x_base);
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return 0;
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}
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static const struct dev_pm_ops acp6x_pdm_pm_ops = {
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SET_RUNTIME_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_runtime_resume, NULL)
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SET_SYSTEM_SLEEP_PM_OPS(acp6x_pdm_suspend, acp6x_pdm_resume)
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};
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static struct platform_driver acp6x_pdm_dma_driver = {
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.probe = acp6x_pdm_audio_probe,
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.remove = acp6x_pdm_audio_remove,
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.driver = {
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.name = "acp_yc_pdm_dma",
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.pm = &acp6x_pdm_pm_ops,
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},
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};
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module_platform_driver(acp6x_pdm_dma_driver);
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MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
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MODULE_DESCRIPTION("AMD ACP6x YC PDM Driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" DRV_NAME);
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