sound/soc/rockchip/rockchip_pdm.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Rockchip PDM ALSA SoC Digital Audio Interface(DAI)  driver
  *
  * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
  */

 #include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/rational.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>

 #include "rockchip_pdm.h"

 #define PDM_DMA_BURST_SIZE	(8) /* size * width: 8*4 = 32 bytes */
 #define PDM_SIGNOFF_CLK_RATE	(100000000)

 enum rk_pdm_version {
 	RK_PDM_RK3229,
 	RK_PDM_RK3308,
 };

 struct rk_pdm_dev {
 	struct device *dev;
 	struct clk *clk;
 	struct clk *hclk;
 	struct regmap *regmap;
 	struct snd_dmaengine_dai_dma_data capture_dma_data;
 	struct reset_control *reset;
 	enum rk_pdm_version version;
 };

 struct rk_pdm_clkref {
 	unsigned int sr;
 	unsigned int clk;
 	unsigned int clk_out;
 };

 struct rk_pdm_ds_ratio {
 	unsigned int ratio;
 	unsigned int sr;
 };

 static struct rk_pdm_clkref clkref[] = {
 	{ 8000, 40960000, 2048000 },
 	{ 11025, 56448000, 2822400 },
 	{ 12000, 61440000, 3072000 },
 	{ 8000, 98304000, 2048000 },
 	{ 12000, 98304000, 3072000 },
 };

 static struct rk_pdm_ds_ratio ds_ratio[] = {
 	{ 0, 192000 },
 	{ 0, 176400 },
 	{ 0, 128000 },
 	{ 1, 96000 },
 	{ 1, 88200 },
 	{ 1, 64000 },
 	{ 2, 48000 },
 	{ 2, 44100 },
 	{ 2, 32000 },
 	{ 3, 24000 },
 	{ 3, 22050 },
 	{ 3, 16000 },
 	{ 4, 12000 },
 	{ 4, 11025 },
 	{ 4, 8000 },
 };

 static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
 				unsigned int *clk_src, unsigned int *clk_out)
 {
 	unsigned int i, count, clk, div, rate;

 	clk = 0;
 	if (!sr)
 		return clk;

 	count = ARRAY_SIZE(clkref);
 	for (i = 0; i < count; i++) {
 		if (sr % clkref[i].sr)
 			continue;
 		div = sr / clkref[i].sr;
 		if ((div & (div - 1)) == 0) {
 			*clk_out = clkref[i].clk_out;
 			rate = clk_round_rate(pdm->clk, clkref[i].clk);
 			if (rate != clkref[i].clk)
 				continue;
 			clk = clkref[i].clk;
 			*clk_src = clkref[i].clk;
 			break;
 		}
 	}

 	if (!clk) {
 		clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE);
 		*clk_src = clk;
 	}
 	return clk;
 }

 static unsigned int get_pdm_ds_ratio(unsigned int sr)
 {
 	unsigned int i, count, ratio;

 	ratio = 0;
 	if (!sr)
 		return ratio;

 	count = ARRAY_SIZE(ds_ratio);
 	for (i = 0; i < count; i++) {
 		if (sr == ds_ratio[i].sr)
 			ratio = ds_ratio[i].ratio;
 	}
 	return ratio;
 }

 static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
 {
 	return snd_soc_dai_get_drvdata(dai);
 }

 static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
 {
 	if (on) {
 		regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
 				   PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
 		regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
 				   PDM_RX_MASK, PDM_RX_START);
 	} else {
 		regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
 				   PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
 		regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
 				   PDM_RX_MASK | PDM_RX_CLR_MASK,
 				   PDM_RX_STOP | PDM_RX_CLR_WR);
 	}
 }

 static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *params,
 				  struct snd_soc_dai *dai)
 {
 	struct rk_pdm_dev *pdm = to_info(dai);
 	unsigned int val = 0;
 	unsigned int clk_rate, clk_div, samplerate;
 	unsigned int clk_src, clk_out = 0;
 	unsigned long m, n;
 	bool change;
 	int ret;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		return 0;

 	samplerate = params_rate(params);
 	clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out);
 	if (!clk_rate)
 		return -EINVAL;

 	ret = clk_set_rate(pdm->clk, clk_src);
 	if (ret)
 		return -EINVAL;

 	if (pdm->version == RK_PDM_RK3308) {
 		rational_best_approximation(clk_out, clk_src,
 					    GENMASK(16 - 1, 0),
 					    GENMASK(16 - 1, 0),
 					    &m, &n);

 		val = (m << PDM_FD_NUMERATOR_SFT) |
 			(n << PDM_FD_DENOMINATOR_SFT);
 		regmap_update_bits_check(pdm->regmap, PDM_CTRL1,
 					 PDM_FD_NUMERATOR_MSK |
 					 PDM_FD_DENOMINATOR_MSK,
 					 val, &change);
 		if (change) {
 			reset_control_assert(pdm->reset);
 			reset_control_deassert(pdm->reset);
 			rockchip_pdm_rxctrl(pdm, 0);
 		}
 		clk_div = n / m;
 		if (clk_div >= 40)
 			val = PDM_CLK_FD_RATIO_40;
 		else if (clk_div <= 35)
 			val = PDM_CLK_FD_RATIO_35;
 		else
 			return -EINVAL;
 		regmap_update_bits(pdm->regmap, PDM_CLK_CTRL,
 				   PDM_CLK_FD_RATIO_MSK,
 				   val);
 	}
 	val = get_pdm_ds_ratio(samplerate);
 	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
 	regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
 			   PDM_HPF_CF_MSK, PDM_HPF_60HZ);
 	regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
 			   PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE);
 	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
 	if (pdm->version != RK_PDM_RK3229)
 		regmap_update_bits(pdm->regmap, PDM_CTRL0,
 				   PDM_MODE_MSK, PDM_MODE_LJ);

 	val = 0;
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S8:
 		val |= PDM_VDW(8);
 		break;
 	case SNDRV_PCM_FORMAT_S16_LE:
 		val |= PDM_VDW(16);
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		val |= PDM_VDW(20);
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		val |= PDM_VDW(24);
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		val |= PDM_VDW(32);
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (params_channels(params)) {
 	case 8:
 		val |= PDM_PATH3_EN;
 		/* fallthrough */
 	case 6:
 		val |= PDM_PATH2_EN;
 		/* fallthrough */
 	case 4:
 		val |= PDM_PATH1_EN;
 		/* fallthrough */
 	case 2:
 		val |= PDM_PATH0_EN;
 		break;
 	default:
 		dev_err(pdm->dev, "invalid channel: %d\n",
 			params_channels(params));
 		return -EINVAL;
 	}

 	regmap_update_bits(pdm->regmap, PDM_CTRL0,
 			   PDM_PATH_MSK | PDM_VDW_MSK,
 			   val);
 	/* all channels share the single FIFO */
 	regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
 			   PDM_DMA_RDL(8 * params_channels(params)));

 	return 0;
 }

 static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
 				unsigned int fmt)
 {
 	struct rk_pdm_dev *pdm = to_info(cpu_dai);
 	unsigned int mask = 0, val = 0;

 	mask = PDM_CKP_MSK;
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		val = PDM_CKP_NORMAL;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		val = PDM_CKP_INVERTED;
 		break;
 	default:
 		return -EINVAL;
 	}

 	pm_runtime_get_sync(cpu_dai->dev);
 	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
 	pm_runtime_put(cpu_dai->dev);

 	return 0;
 }

 static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
 				struct snd_soc_dai *dai)
 {
 	struct rk_pdm_dev *pdm = to_info(dai);
 	int ret = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			rockchip_pdm_rxctrl(pdm, 1);
 		break;
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			rockchip_pdm_rxctrl(pdm, 0);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
 {
 	struct rk_pdm_dev *pdm = to_info(dai);

 	dai->capture_dma_data = &pdm->capture_dma_data;

 	return 0;
 }

 static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
 	.set_fmt = rockchip_pdm_set_fmt,
 	.trigger = rockchip_pdm_trigger,
 	.hw_params = rockchip_pdm_hw_params,
 };

 #define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
 #define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
 			      SNDRV_PCM_FMTBIT_S20_3LE | \
 			      SNDRV_PCM_FMTBIT_S24_LE | \
 			      SNDRV_PCM_FMTBIT_S32_LE)

 static struct snd_soc_dai_driver rockchip_pdm_dai = {
 	.probe = rockchip_pdm_dai_probe,
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 2,
 		.channels_max = 8,
 		.rates = ROCKCHIP_PDM_RATES,
 		.formats = ROCKCHIP_PDM_FORMATS,
 	},
 	.ops = &rockchip_pdm_dai_ops,
 	.symmetric_rates = 1,
 };

 static const struct snd_soc_component_driver rockchip_pdm_component = {
 	.name = "rockchip-pdm",
 };

 static int rockchip_pdm_runtime_suspend(struct device *dev)
 {
 	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);

 	clk_disable_unprepare(pdm->clk);
 	clk_disable_unprepare(pdm->hclk);

 	return 0;
 }

 static int rockchip_pdm_runtime_resume(struct device *dev)
 {
 	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 	int ret;

 	ret = clk_prepare_enable(pdm->clk);
 	if (ret) {
 		dev_err(pdm->dev, "clock enable failed %d\n", ret);
 		return ret;
 	}

 	ret = clk_prepare_enable(pdm->hclk);
 	if (ret) {
 		dev_err(pdm->dev, "hclock enable failed %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case PDM_SYSCONFIG:
 	case PDM_CTRL0:
 	case PDM_CTRL1:
 	case PDM_CLK_CTRL:
 	case PDM_HPF_CTRL:
 	case PDM_FIFO_CTRL:
 	case PDM_DMA_CTRL:
 	case PDM_INT_EN:
 	case PDM_INT_CLR:
 	case PDM_DATA_VALID:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case PDM_SYSCONFIG:
 	case PDM_CTRL0:
 	case PDM_CTRL1:
 	case PDM_CLK_CTRL:
 	case PDM_HPF_CTRL:
 	case PDM_FIFO_CTRL:
 	case PDM_DMA_CTRL:
 	case PDM_INT_EN:
 	case PDM_INT_CLR:
 	case PDM_INT_ST:
 	case PDM_DATA_VALID:
 	case PDM_RXFIFO_DATA:
 	case PDM_VERSION:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case PDM_SYSCONFIG:
 	case PDM_FIFO_CTRL:
 	case PDM_INT_CLR:
 	case PDM_INT_ST:
 	case PDM_RXFIFO_DATA:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case PDM_RXFIFO_DATA:
 		return true;
 	default:
 		return false;
 	}
 }

 static const struct reg_default rockchip_pdm_reg_defaults[] = {
 	{0x04, 0x78000017},
 	{0x08, 0x0bb8ea60},
 	{0x18, 0x0000001f},
 };

 static const struct regmap_config rockchip_pdm_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
 	.max_register = PDM_VERSION,
 	.reg_defaults = rockchip_pdm_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults),
 	.writeable_reg = rockchip_pdm_wr_reg,
 	.readable_reg = rockchip_pdm_rd_reg,
 	.volatile_reg = rockchip_pdm_volatile_reg,
 	.precious_reg = rockchip_pdm_precious_reg,
 	.cache_type = REGCACHE_FLAT,
 };

 static const struct of_device_id rockchip_pdm_match[] = {
 	{ .compatible = "rockchip,pdm",
 	  .data = (void *)RK_PDM_RK3229 },
 	{ .compatible = "rockchip,px30-pdm",
 	  .data = (void *)RK_PDM_RK3308 },
 	{ .compatible = "rockchip,rk1808-pdm",
 	  .data = (void *)RK_PDM_RK3308 },
 	{ .compatible = "rockchip,rk3308-pdm",
 	  .data = (void *)RK_PDM_RK3308 },
 	{},
 };
 MODULE_DEVICE_TABLE(of, rockchip_pdm_match);

 static int rockchip_pdm_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
 	struct rk_pdm_dev *pdm;
 	struct resource *res;
 	void __iomem *regs;
 	int ret;

 	pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL);
 	if (!pdm)
 		return -ENOMEM;

 	match = of_match_device(rockchip_pdm_match, &pdev->dev);
 	if (match)
 		pdm->version = (enum rk_pdm_version)match->data;

 	if (pdm->version == RK_PDM_RK3308) {
 		pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m");
 		if (IS_ERR(pdm->reset))
 			return PTR_ERR(pdm->reset);
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);

 	pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 					    &rockchip_pdm_regmap_config);
 	if (IS_ERR(pdm->regmap))
 		return PTR_ERR(pdm->regmap);

 	pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
 	pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;

 	pdm->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, pdm);

 	pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");
 	if (IS_ERR(pdm->clk))
 		return PTR_ERR(pdm->clk);

 	pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk");
 	if (IS_ERR(pdm->hclk))
 		return PTR_ERR(pdm->hclk);

 	ret = clk_prepare_enable(pdm->hclk);
 	if (ret)
 		return ret;

 	pm_runtime_enable(&pdev->dev);
 	if (!pm_runtime_enabled(&pdev->dev)) {
 		ret = rockchip_pdm_runtime_resume(&pdev->dev);
 		if (ret)
 			goto err_pm_disable;
 	}

 	ret = devm_snd_soc_register_component(&pdev->dev,
 					      &rockchip_pdm_component,
 					      &rockchip_pdm_dai, 1);

 	if (ret) {
 		dev_err(&pdev->dev, "could not register dai: %d\n", ret);
 		goto err_suspend;
 	}

 	rockchip_pdm_rxctrl(pdm, 0);
 	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 	if (ret) {
 		dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
 		goto err_suspend;
 	}

 	return 0;

 err_suspend:
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		rockchip_pdm_runtime_suspend(&pdev->dev);
 err_pm_disable:
 	pm_runtime_disable(&pdev->dev);

 	clk_disable_unprepare(pdm->hclk);

 	return ret;
 }

 static int rockchip_pdm_remove(struct platform_device *pdev)
 {
 	struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev);

 	pm_runtime_disable(&pdev->dev);
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		rockchip_pdm_runtime_suspend(&pdev->dev);

 	clk_disable_unprepare(pdm->clk);
 	clk_disable_unprepare(pdm->hclk);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int rockchip_pdm_suspend(struct device *dev)
 {
 	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);

 	regcache_mark_dirty(pdm->regmap);

 	return 0;
 }

 static int rockchip_pdm_resume(struct device *dev)
 {
 	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
 	int ret;

 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0)
 		return ret;

 	ret = regcache_sync(pdm->regmap);

 	pm_runtime_put(dev);

 	return ret;
 }
 #endif

 static const struct dev_pm_ops rockchip_pdm_pm_ops = {
 	SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
 			   rockchip_pdm_runtime_resume, NULL)
 	SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
 };

 static struct platform_driver rockchip_pdm_driver = {
 	.probe  = rockchip_pdm_probe,
 	.remove = rockchip_pdm_remove,
 	.driver = {
 		.name = "rockchip-pdm",
 		.of_match_table = of_match_ptr(rockchip_pdm_match),
 		.pm = &rockchip_pdm_pm_ops,
 	},
 };

 module_platform_driver(rockchip_pdm_driver);

 MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
 MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Rockchip PDM ALSA SoC Digital Audio Interface(DAI) driver
	*
	* Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
	*/

	#include <linux/module.h>
	#include <linux/clk.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/rational.h>
	#include <linux/regmap.h>
	#include <linux/reset.h>
	#include <sound/dmaengine_pcm.h>
	#include <sound/pcm_params.h>

	#include "rockchip_pdm.h"

	#define PDM_DMA_BURST_SIZE (8) /* size * width: 84 = 32 bytes /
	#define PDM_SIGNOFF_CLK_RATE (100000000)

	enum rk_pdm_version {
	RK_PDM_RK3229,
	RK_PDM_RK3308,
	};

	struct rk_pdm_dev {
	struct device *dev;
	struct clk *clk;
	struct clk *hclk;
	struct regmap *regmap;
	struct snd_dmaengine_dai_dma_data capture_dma_data;
	struct reset_control *reset;
	enum rk_pdm_version version;
	};

	struct rk_pdm_clkref {
	unsigned int sr;
	unsigned int clk;
	unsigned int clk_out;
	};

	struct rk_pdm_ds_ratio {
	unsigned int ratio;
	unsigned int sr;
	};

	static struct rk_pdm_clkref clkref[] = {
	{ 8000, 40960000, 2048000 },
	{ 11025, 56448000, 2822400 },
	{ 12000, 61440000, 3072000 },
	{ 8000, 98304000, 2048000 },
	{ 12000, 98304000, 3072000 },
	};

	static struct rk_pdm_ds_ratio ds_ratio[] = {
	{ 0, 192000 },
	{ 0, 176400 },
	{ 0, 128000 },
	{ 1, 96000 },
	{ 1, 88200 },
	{ 1, 64000 },
	{ 2, 48000 },
	{ 2, 44100 },
	{ 2, 32000 },
	{ 3, 24000 },
	{ 3, 22050 },
	{ 3, 16000 },
	{ 4, 12000 },
	{ 4, 11025 },
	{ 4, 8000 },
	};

	static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
	unsigned int clk_src, unsigned int clk_out)
	{
	unsigned int i, count, clk, div, rate;

	clk = 0;
	if (!sr)
	return clk;

	count = ARRAY_SIZE(clkref);
	for (i = 0; i < count; i++) {
	if (sr % clkref[i].sr)
	continue;
	div = sr / clkref[i].sr;
	if ((div & (div - 1)) == 0) {
	*clk_out = clkref[i].clk_out;
	rate = clk_round_rate(pdm->clk, clkref[i].clk);
	if (rate != clkref[i].clk)
	continue;
	clk = clkref[i].clk;
	*clk_src = clkref[i].clk;
	break;
	}
	}

	if (!clk) {
	clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE);
	*clk_src = clk;
	}
	return clk;
	}

	static unsigned int get_pdm_ds_ratio(unsigned int sr)
	{
	unsigned int i, count, ratio;

	ratio = 0;
	if (!sr)
	return ratio;

	count = ARRAY_SIZE(ds_ratio);
	for (i = 0; i < count; i++) {
	if (sr == ds_ratio[i].sr)
	ratio = ds_ratio[i].ratio;
	}
	return ratio;
	}

	static inline struct rk_pdm_dev to_info(struct snd_soc_dai dai)
	{
	return snd_soc_dai_get_drvdata(dai);
	}

	static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
	{
	if (on) {
	regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
	PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
	regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
	PDM_RX_MASK, PDM_RX_START);
	} else {
	regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
	PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
	regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
	PDM_RX_MASK \| PDM_RX_CLR_MASK,
	PDM_RX_STOP \| PDM_RX_CLR_WR);
	}
	}

	static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct rk_pdm_dev *pdm = to_info(dai);
	unsigned int val = 0;
	unsigned int clk_rate, clk_div, samplerate;
	unsigned int clk_src, clk_out = 0;
	unsigned long m, n;
	bool change;
	int ret;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	return 0;

	samplerate = params_rate(params);
	clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out);
	if (!clk_rate)
	return -EINVAL;

	ret = clk_set_rate(pdm->clk, clk_src);
	if (ret)
	return -EINVAL;

	if (pdm->version == RK_PDM_RK3308) {
	rational_best_approximation(clk_out, clk_src,
	GENMASK(16 - 1, 0),
	GENMASK(16 - 1, 0),
	&m, &n);

	val = (m << PDM_FD_NUMERATOR_SFT) \|
	(n << PDM_FD_DENOMINATOR_SFT);
	regmap_update_bits_check(pdm->regmap, PDM_CTRL1,
	PDM_FD_NUMERATOR_MSK \|
	PDM_FD_DENOMINATOR_MSK,
	val, &change);
	if (change) {
	reset_control_assert(pdm->reset);
	reset_control_deassert(pdm->reset);
	rockchip_pdm_rxctrl(pdm, 0);
	}
	clk_div = n / m;
	if (clk_div >= 40)
	val = PDM_CLK_FD_RATIO_40;
	else if (clk_div <= 35)
	val = PDM_CLK_FD_RATIO_35;
	else
	return -EINVAL;
	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL,
	PDM_CLK_FD_RATIO_MSK,
	val);
	}
	val = get_pdm_ds_ratio(samplerate);
	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
	regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
	PDM_HPF_CF_MSK, PDM_HPF_60HZ);
	regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
	PDM_HPF_LE \| PDM_HPF_RE, PDM_HPF_LE \| PDM_HPF_RE);
	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
	if (pdm->version != RK_PDM_RK3229)
	regmap_update_bits(pdm->regmap, PDM_CTRL0,
	PDM_MODE_MSK, PDM_MODE_LJ);

	val = 0;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
	val \|= PDM_VDW(8);
	break;
	case SNDRV_PCM_FORMAT_S16_LE:
	val \|= PDM_VDW(16);
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	val \|= PDM_VDW(20);
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	val \|= PDM_VDW(24);
	break;
	case SNDRV_PCM_FORMAT_S32_LE:
	val \|= PDM_VDW(32);
	break;
	default:
	return -EINVAL;
	}

	switch (params_channels(params)) {
	case 8:
	val \|= PDM_PATH3_EN;
	/* fallthrough */
	case 6:
	val \|= PDM_PATH2_EN;
	/* fallthrough */
	case 4:
	val \|= PDM_PATH1_EN;
	/* fallthrough */
	case 2:
	val \|= PDM_PATH0_EN;
	break;
	default:
	dev_err(pdm->dev, "invalid channel: %d\n",
	params_channels(params));
	return -EINVAL;
	}

	regmap_update_bits(pdm->regmap, PDM_CTRL0,
	PDM_PATH_MSK \| PDM_VDW_MSK,
	val);
	/* all channels share the single FIFO */
	regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
	PDM_DMA_RDL(8 * params_channels(params)));

	return 0;
	}

	static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
	unsigned int fmt)
	{
	struct rk_pdm_dev *pdm = to_info(cpu_dai);
	unsigned int mask = 0, val = 0;

	mask = PDM_CKP_MSK;
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	val = PDM_CKP_NORMAL;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	val = PDM_CKP_INVERTED;
	break;
	default:
	return -EINVAL;
	}

	pm_runtime_get_sync(cpu_dai->dev);
	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
	pm_runtime_put(cpu_dai->dev);

	return 0;
	}

	static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct rk_pdm_dev *pdm = to_info(dai);
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	rockchip_pdm_rxctrl(pdm, 1);
	break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	rockchip_pdm_rxctrl(pdm, 0);
	break;
	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
	{
	struct rk_pdm_dev *pdm = to_info(dai);

	dai->capture_dma_data = &pdm->capture_dma_data;

	return 0;
	}

	static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
	.set_fmt = rockchip_pdm_set_fmt,
	.trigger = rockchip_pdm_trigger,
	.hw_params = rockchip_pdm_hw_params,
	};

	#define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
	#define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| \
	SNDRV_PCM_FMTBIT_S20_3LE \| \
	SNDRV_PCM_FMTBIT_S24_LE \| \
	SNDRV_PCM_FMTBIT_S32_LE)

	static struct snd_soc_dai_driver rockchip_pdm_dai = {
	.probe = rockchip_pdm_dai_probe,
	.capture = {
	.stream_name = "Capture",
	.channels_min = 2,
	.channels_max = 8,
	.rates = ROCKCHIP_PDM_RATES,
	.formats = ROCKCHIP_PDM_FORMATS,
	},
	.ops = &rockchip_pdm_dai_ops,
	.symmetric_rates = 1,
	};

	static const struct snd_soc_component_driver rockchip_pdm_component = {
	.name = "rockchip-pdm",
	};

	static int rockchip_pdm_runtime_suspend(struct device *dev)
	{
	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);

	clk_disable_unprepare(pdm->clk);
	clk_disable_unprepare(pdm->hclk);

	return 0;
	}

	static int rockchip_pdm_runtime_resume(struct device *dev)
	{
	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(pdm->clk);
	if (ret) {
	dev_err(pdm->dev, "clock enable failed %d\n", ret);
	return ret;
	}

	ret = clk_prepare_enable(pdm->hclk);
	if (ret) {
	dev_err(pdm->dev, "hclock enable failed %d\n", ret);
	return ret;
	}

	return 0;
	}

	static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case PDM_SYSCONFIG:
	case PDM_CTRL0:
	case PDM_CTRL1:
	case PDM_CLK_CTRL:
	case PDM_HPF_CTRL:
	case PDM_FIFO_CTRL:
	case PDM_DMA_CTRL:
	case PDM_INT_EN:
	case PDM_INT_CLR:
	case PDM_DATA_VALID:
	return true;
	default:
	return false;
	}
	}

	static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case PDM_SYSCONFIG:
	case PDM_CTRL0:
	case PDM_CTRL1:
	case PDM_CLK_CTRL:
	case PDM_HPF_CTRL:
	case PDM_FIFO_CTRL:
	case PDM_DMA_CTRL:
	case PDM_INT_EN:
	case PDM_INT_CLR:
	case PDM_INT_ST:
	case PDM_DATA_VALID:
	case PDM_RXFIFO_DATA:
	case PDM_VERSION:
	return true;
	default:
	return false;
	}
	}

	static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case PDM_SYSCONFIG:
	case PDM_FIFO_CTRL:
	case PDM_INT_CLR:
	case PDM_INT_ST:
	case PDM_RXFIFO_DATA:
	return true;
	default:
	return false;
	}
	}

	static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case PDM_RXFIFO_DATA:
	return true;
	default:
	return false;
	}
	}

	static const struct reg_default rockchip_pdm_reg_defaults[] = {
	{0x04, 0x78000017},
	{0x08, 0x0bb8ea60},
	{0x18, 0x0000001f},
	};

	static const struct regmap_config rockchip_pdm_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = PDM_VERSION,
	.reg_defaults = rockchip_pdm_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults),
	.writeable_reg = rockchip_pdm_wr_reg,
	.readable_reg = rockchip_pdm_rd_reg,
	.volatile_reg = rockchip_pdm_volatile_reg,
	.precious_reg = rockchip_pdm_precious_reg,
	.cache_type = REGCACHE_FLAT,
	};

	static const struct of_device_id rockchip_pdm_match[] = {
	{ .compatible = "rockchip,pdm",
	.data = (void *)RK_PDM_RK3229 },
	{ .compatible = "rockchip,px30-pdm",
	.data = (void *)RK_PDM_RK3308 },
	{ .compatible = "rockchip,rk1808-pdm",
	.data = (void *)RK_PDM_RK3308 },
	{ .compatible = "rockchip,rk3308-pdm",
	.data = (void *)RK_PDM_RK3308 },
	{},
	};
	MODULE_DEVICE_TABLE(of, rockchip_pdm_match);

	static int rockchip_pdm_probe(struct platform_device *pdev)
	{
	const struct of_device_id *match;
	struct rk_pdm_dev *pdm;
	struct resource *res;
	void __iomem *regs;
	int ret;

	pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL);
	if (!pdm)
	return -ENOMEM;

	match = of_match_device(rockchip_pdm_match, &pdev->dev);
	if (match)
	pdm->version = (enum rk_pdm_version)match->data;

	if (pdm->version == RK_PDM_RK3308) {
	pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m");
	if (IS_ERR(pdm->reset))
	return PTR_ERR(pdm->reset);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(regs))
	return PTR_ERR(regs);

	pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
	&rockchip_pdm_regmap_config);
	if (IS_ERR(pdm->regmap))
	return PTR_ERR(pdm->regmap);

	pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
	pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;

	pdm->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, pdm);

	pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");
	if (IS_ERR(pdm->clk))
	return PTR_ERR(pdm->clk);

	pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk");
	if (IS_ERR(pdm->hclk))
	return PTR_ERR(pdm->hclk);

	ret = clk_prepare_enable(pdm->hclk);
	if (ret)
	return ret;

	pm_runtime_enable(&pdev->dev);
	if (!pm_runtime_enabled(&pdev->dev)) {
	ret = rockchip_pdm_runtime_resume(&pdev->dev);
	if (ret)
	goto err_pm_disable;
	}

	ret = devm_snd_soc_register_component(&pdev->dev,
	&rockchip_pdm_component,
	&rockchip_pdm_dai, 1);

	if (ret) {
	dev_err(&pdev->dev, "could not register dai: %d\n", ret);
	goto err_suspend;
	}

	rockchip_pdm_rxctrl(pdm, 0);
	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
	if (ret) {
	dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
	goto err_suspend;
	}

	return 0;

	err_suspend:
	if (!pm_runtime_status_suspended(&pdev->dev))
	rockchip_pdm_runtime_suspend(&pdev->dev);
	err_pm_disable:
	pm_runtime_disable(&pdev->dev);

	clk_disable_unprepare(pdm->hclk);

	return ret;
	}

	static int rockchip_pdm_remove(struct platform_device *pdev)
	{
	struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev);

	pm_runtime_disable(&pdev->dev);
	if (!pm_runtime_status_suspended(&pdev->dev))
	rockchip_pdm_runtime_suspend(&pdev->dev);

	clk_disable_unprepare(pdm->clk);
	clk_disable_unprepare(pdm->hclk);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int rockchip_pdm_suspend(struct device *dev)
	{
	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);

	regcache_mark_dirty(pdm->regmap);

	return 0;
	}

	static int rockchip_pdm_resume(struct device *dev)
	{
	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
	int ret;

	ret = pm_runtime_get_sync(dev);
	if (ret < 0)
	return ret;

	ret = regcache_sync(pdm->regmap);

	pm_runtime_put(dev);

	return ret;
	}
	#endif

	static const struct dev_pm_ops rockchip_pdm_pm_ops = {
	SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
	rockchip_pdm_runtime_resume, NULL)
	SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
	};

	static struct platform_driver rockchip_pdm_driver = {
	.probe = rockchip_pdm_probe,
	.remove = rockchip_pdm_remove,
	.driver = {
	.name = "rockchip-pdm",
	.of_match_table = of_match_ptr(rockchip_pdm_match),
	.pm = &rockchip_pdm_pm_ops,
	},
	};

	module_platform_driver(rockchip_pdm_driver);

	MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
	MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
	MODULE_LICENSE("GPL v2");