sound/soc/zte/zx-i2s.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) 2015 Linaro
  *
  * Author: Jun Nie <jun.nie@linaro.org>
  */

 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dai.h>

 #include <sound/core.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/initval.h>

 #define ZX_I2S_PROCESS_CTRL	0x04
 #define ZX_I2S_TIMING_CTRL	0x08
 #define	ZX_I2S_FIFO_CTRL	0x0C
 #define	ZX_I2S_FIFO_STATUS	0x10
 #define ZX_I2S_INT_EN		0x14
 #define ZX_I2S_INT_STATUS	0x18
 #define ZX_I2S_DATA		0x1C
 #define ZX_I2S_FRAME_CNTR	0x20

 #define I2S_DEAGULT_FIFO_THRES	(0x10)
 #define I2S_MAX_FIFO_THRES	(0x20)

 #define ZX_I2S_PROCESS_TX_EN	(1 << 0)
 #define ZX_I2S_PROCESS_TX_DIS	(0 << 0)
 #define ZX_I2S_PROCESS_RX_EN	(1 << 1)
 #define ZX_I2S_PROCESS_RX_DIS	(0 << 1)
 #define ZX_I2S_PROCESS_I2S_EN	(1 << 2)
 #define ZX_I2S_PROCESS_I2S_DIS	(0 << 2)

 #define ZX_I2S_TIMING_MAST		(1 << 0)
 #define ZX_I2S_TIMING_SLAVE		(0 << 0)
 #define ZX_I2S_TIMING_MS_MASK		(1 << 0)
 #define ZX_I2S_TIMING_LOOP		(1 << 1)
 #define ZX_I2S_TIMING_NOR		(0 << 1)
 #define ZX_I2S_TIMING_LOOP_MASK		(1 << 1)
 #define ZX_I2S_TIMING_PTNR		(1 << 2)
 #define ZX_I2S_TIMING_NTPR		(0 << 2)
 #define ZX_I2S_TIMING_PHASE_MASK	(1 << 2)
 #define ZX_I2S_TIMING_TDM		(1 << 3)
 #define ZX_I2S_TIMING_I2S		(0 << 3)
 #define ZX_I2S_TIMING_TIMING_MASK	(1 << 3)
 #define ZX_I2S_TIMING_LONG_SYNC		(1 << 4)
 #define ZX_I2S_TIMING_SHORT_SYNC	(0 << 4)
 #define ZX_I2S_TIMING_SYNC_MASK		(1 << 4)
 #define ZX_I2S_TIMING_TEAK_EN		(1 << 5)
 #define ZX_I2S_TIMING_TEAK_DIS		(0 << 5)
 #define ZX_I2S_TIMING_TEAK_MASK		(1 << 5)
 #define ZX_I2S_TIMING_STD_I2S		(0 << 6)
 #define ZX_I2S_TIMING_MSB_JUSTIF	(1 << 6)
 #define ZX_I2S_TIMING_LSB_JUSTIF	(2 << 6)
 #define ZX_I2S_TIMING_ALIGN_MASK	(3 << 6)
 #define ZX_I2S_TIMING_CHN_MASK		(7 << 8)
 #define ZX_I2S_TIMING_CHN(x)		((x - 1) << 8)
 #define ZX_I2S_TIMING_LANE_MASK		(3 << 11)
 #define ZX_I2S_TIMING_LANE(x)		((x - 1) << 11)
 #define ZX_I2S_TIMING_TSCFG_MASK	(7 << 13)
 #define ZX_I2S_TIMING_TSCFG(x)		(x << 13)
 #define ZX_I2S_TIMING_TS_WIDTH_MASK	(0x1f << 16)
 #define ZX_I2S_TIMING_TS_WIDTH(x)	((x - 1) << 16)
 #define ZX_I2S_TIMING_DATA_SIZE_MASK	(0x1f << 21)
 #define ZX_I2S_TIMING_DATA_SIZE(x)	((x - 1) << 21)
 #define ZX_I2S_TIMING_CFG_ERR_MASK	(1 << 31)

 #define ZX_I2S_FIFO_CTRL_TX_RST		(1 << 0)
 #define ZX_I2S_FIFO_CTRL_TX_RST_MASK	(1 << 0)
 #define ZX_I2S_FIFO_CTRL_RX_RST		(1 << 1)
 #define ZX_I2S_FIFO_CTRL_RX_RST_MASK	(1 << 1)
 #define ZX_I2S_FIFO_CTRL_TX_DMA_EN	(1 << 4)
 #define ZX_I2S_FIFO_CTRL_TX_DMA_DIS	(0 << 4)
 #define ZX_I2S_FIFO_CTRL_TX_DMA_MASK	(1 << 4)
 #define ZX_I2S_FIFO_CTRL_RX_DMA_EN	(1 << 5)
 #define ZX_I2S_FIFO_CTRL_RX_DMA_DIS	(0 << 5)
 #define ZX_I2S_FIFO_CTRL_RX_DMA_MASK	(1 << 5)
 #define ZX_I2S_FIFO_CTRL_TX_THRES_MASK	(0x1F << 8)
 #define ZX_I2S_FIFO_CTRL_RX_THRES_MASK	(0x1F << 16)

 #define CLK_RAT (32 * 4)

 struct zx_i2s_info {
 	struct snd_dmaengine_dai_dma_data	dma_playback;
 	struct snd_dmaengine_dai_dma_data	dma_capture;
 	struct clk				*dai_wclk;
 	struct clk				*dai_pclk;
 	void __iomem				*reg_base;
 	int					master;
 	resource_size_t				mapbase;
 };

 static void zx_i2s_tx_en(void __iomem *base, bool on)
 {
 	unsigned long val;

 	val = readl_relaxed(base + ZX_I2S_PROCESS_CTRL);
 	if (on)
 		val |= ZX_I2S_PROCESS_TX_EN | ZX_I2S_PROCESS_I2S_EN;
 	else
 		val &= ~(ZX_I2S_PROCESS_TX_EN | ZX_I2S_PROCESS_I2S_EN);
 	writel_relaxed(val, base + ZX_I2S_PROCESS_CTRL);
 }

 static void zx_i2s_rx_en(void __iomem *base, bool on)
 {
 	unsigned long val;

 	val = readl_relaxed(base + ZX_I2S_PROCESS_CTRL);
 	if (on)
 		val |= ZX_I2S_PROCESS_RX_EN | ZX_I2S_PROCESS_I2S_EN;
 	else
 		val &= ~(ZX_I2S_PROCESS_RX_EN | ZX_I2S_PROCESS_I2S_EN);
 	writel_relaxed(val, base + ZX_I2S_PROCESS_CTRL);
 }

 static void zx_i2s_tx_dma_en(void __iomem *base, bool on)
 {
 	unsigned long val;

 	val = readl_relaxed(base + ZX_I2S_FIFO_CTRL);
 	val |= ZX_I2S_FIFO_CTRL_TX_RST | (I2S_DEAGULT_FIFO_THRES << 8);
 	if (on)
 		val |= ZX_I2S_FIFO_CTRL_TX_DMA_EN;
 	else
 		val &= ~ZX_I2S_FIFO_CTRL_TX_DMA_EN;
 	writel_relaxed(val, base + ZX_I2S_FIFO_CTRL);
 }

 static void zx_i2s_rx_dma_en(void __iomem *base, bool on)
 {
 	unsigned long val;

 	val = readl_relaxed(base + ZX_I2S_FIFO_CTRL);
 	val |= ZX_I2S_FIFO_CTRL_RX_RST | (I2S_DEAGULT_FIFO_THRES << 16);
 	if (on)
 		val |= ZX_I2S_FIFO_CTRL_RX_DMA_EN;
 	else
 		val &= ~ZX_I2S_FIFO_CTRL_RX_DMA_EN;
 	writel_relaxed(val, base + ZX_I2S_FIFO_CTRL);
 }

 #define ZX_I2S_RATES \
 	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
 	 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
 	 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000| \
 	 SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000)

 #define ZX_I2S_FMTBIT \
 	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE | \
 	SNDRV_PCM_FMTBIT_S32_LE)

 static int zx_i2s_dai_probe(struct snd_soc_dai *dai)
 {
 	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);

 	snd_soc_dai_set_drvdata(dai, zx_i2s);
 	zx_i2s->dma_playback.addr = zx_i2s->mapbase + ZX_I2S_DATA;
 	zx_i2s->dma_playback.maxburst = 16;
 	zx_i2s->dma_capture.addr = zx_i2s->mapbase + ZX_I2S_DATA;
 	zx_i2s->dma_capture.maxburst = 16;
 	snd_soc_dai_init_dma_data(dai, &zx_i2s->dma_playback,
 				  &zx_i2s->dma_capture);
 	return 0;
 }

 static int zx_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 {
 	struct zx_i2s_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
 	unsigned long val;

 	val = readl_relaxed(i2s->reg_base + ZX_I2S_TIMING_CTRL);
 	val &= ~(ZX_I2S_TIMING_TIMING_MASK | ZX_I2S_TIMING_ALIGN_MASK |
 			ZX_I2S_TIMING_TEAK_MASK | ZX_I2S_TIMING_SYNC_MASK |
 			ZX_I2S_TIMING_MS_MASK);

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		val |= (ZX_I2S_TIMING_I2S | ZX_I2S_TIMING_STD_I2S);
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		val |= (ZX_I2S_TIMING_I2S | ZX_I2S_TIMING_MSB_JUSTIF);
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		val |= (ZX_I2S_TIMING_I2S | ZX_I2S_TIMING_LSB_JUSTIF);
 		break;
 	default:
 		dev_err(cpu_dai->dev, "Unknown i2s timing\n");
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		/* Codec is master, and I2S is slave. */
 		i2s->master = 0;
 		val |= ZX_I2S_TIMING_SLAVE;
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 		/* Codec is slave, and I2S is master. */
 		i2s->master = 1;
 		val |= ZX_I2S_TIMING_MAST;
 		break;
 	default:
 		dev_err(cpu_dai->dev, "Unknown master/slave format\n");
 		return -EINVAL;
 	}

 	writel_relaxed(val, i2s->reg_base + ZX_I2S_TIMING_CTRL);
 	return 0;
 }

 static int zx_i2s_hw_params(struct snd_pcm_substream *substream,
 			    struct snd_pcm_hw_params *params,
 			    struct snd_soc_dai *socdai)
 {
 	struct zx_i2s_info *i2s = snd_soc_dai_get_drvdata(socdai);
 	struct snd_dmaengine_dai_dma_data *dma_data;
 	unsigned int lane, ch_num, len, ret = 0;
 	unsigned int ts_width = 32;
 	unsigned long val;
 	unsigned long chn_cfg;

 	dma_data = snd_soc_dai_get_dma_data(socdai, substream);
 	dma_data->addr_width = ts_width >> 3;

 	val = readl_relaxed(i2s->reg_base + ZX_I2S_TIMING_CTRL);
 	val &= ~(ZX_I2S_TIMING_TS_WIDTH_MASK | ZX_I2S_TIMING_DATA_SIZE_MASK |
 		ZX_I2S_TIMING_LANE_MASK | ZX_I2S_TIMING_CHN_MASK |
 		ZX_I2S_TIMING_TSCFG_MASK);

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		len = 16;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		len = 24;
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		len = 32;
 		break;
 	default:
 		dev_err(socdai->dev, "Unknown data format\n");
 		return -EINVAL;
 	}
 	val |= ZX_I2S_TIMING_TS_WIDTH(ts_width) | ZX_I2S_TIMING_DATA_SIZE(len);

 	ch_num = params_channels(params);
 	switch (ch_num) {
 	case 1:
 		lane = 1;
 		chn_cfg = 2;
 		break;
 	case 2:
 	case 4:
 	case 6:
 	case 8:
 		lane = ch_num / 2;
 		chn_cfg = 3;
 		break;
 	default:
 		dev_err(socdai->dev, "Not support channel num %d\n", ch_num);
 		return -EINVAL;
 	}
 	val |= ZX_I2S_TIMING_LANE(lane);
 	val |= ZX_I2S_TIMING_TSCFG(chn_cfg);
 	val |= ZX_I2S_TIMING_CHN(ch_num);
 	writel_relaxed(val, i2s->reg_base + ZX_I2S_TIMING_CTRL);

 	if (i2s->master)
 		ret = clk_set_rate(i2s->dai_wclk,
 				params_rate(params) * ch_num * CLK_RAT);

 	return ret;
 }

 static int zx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 			  struct snd_soc_dai *dai)
 {
 	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
 	int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
 	int ret = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		if (capture)
 			zx_i2s_rx_dma_en(zx_i2s->reg_base, true);
 		else
 			zx_i2s_tx_dma_en(zx_i2s->reg_base, true);
 	/* fall thru */
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		if (capture)
 			zx_i2s_rx_en(zx_i2s->reg_base, true);
 		else
 			zx_i2s_tx_en(zx_i2s->reg_base, true);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 		if (capture)
 			zx_i2s_rx_dma_en(zx_i2s->reg_base, false);
 		else
 			zx_i2s_tx_dma_en(zx_i2s->reg_base, false);
 	/* fall thru */
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		if (capture)
 			zx_i2s_rx_en(zx_i2s->reg_base, false);
 		else
 			zx_i2s_tx_en(zx_i2s->reg_base, false);
 		break;

 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static int zx_i2s_startup(struct snd_pcm_substream *substream,
 			  struct snd_soc_dai *dai)
 {
 	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
 	int ret;

 	ret = clk_prepare_enable(zx_i2s->dai_wclk);
 	if (ret)
 		return ret;

 	ret = clk_prepare_enable(zx_i2s->dai_pclk);
 	if (ret) {
 		clk_disable_unprepare(zx_i2s->dai_wclk);
 		return ret;
 	}

 	return ret;
 }

 static void zx_i2s_shutdown(struct snd_pcm_substream *substream,
 			    struct snd_soc_dai *dai)
 {
 	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);

 	clk_disable_unprepare(zx_i2s->dai_wclk);
 	clk_disable_unprepare(zx_i2s->dai_pclk);
 }

 static const struct snd_soc_dai_ops zx_i2s_dai_ops = {
 	.trigger	= zx_i2s_trigger,
 	.hw_params	= zx_i2s_hw_params,
 	.set_fmt	= zx_i2s_set_fmt,
 	.startup	= zx_i2s_startup,
 	.shutdown	= zx_i2s_shutdown,
 };

 static const struct snd_soc_component_driver zx_i2s_component = {
 	.name			= "zx-i2s",
 };

 static struct snd_soc_dai_driver zx_i2s_dai = {
 	.name	= "zx-i2s-dai",
 	.id	= 0,
 	.probe	= zx_i2s_dai_probe,
 	.playback   = {
 		.channels_min	= 1,
 		.channels_max	= 8,
 		.rates		= ZX_I2S_RATES,
 		.formats	= ZX_I2S_FMTBIT,
 	},
 	.capture = {
 		.channels_min	= 1,
 		.channels_max	= 2,
 		.rates		= ZX_I2S_RATES,
 		.formats	= ZX_I2S_FMTBIT,
 	},
 	.ops	= &zx_i2s_dai_ops,
 };

 static int zx_i2s_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	struct zx_i2s_info *zx_i2s;
 	int ret;

 	zx_i2s = devm_kzalloc(&pdev->dev, sizeof(*zx_i2s), GFP_KERNEL);
 	if (!zx_i2s)
 		return -ENOMEM;

 	zx_i2s->dai_wclk = devm_clk_get(&pdev->dev, "wclk");
 	if (IS_ERR(zx_i2s->dai_wclk)) {
 		dev_err(&pdev->dev, "Fail to get wclk\n");
 		return PTR_ERR(zx_i2s->dai_wclk);
 	}

 	zx_i2s->dai_pclk = devm_clk_get(&pdev->dev, "pclk");
 	if (IS_ERR(zx_i2s->dai_pclk)) {
 		dev_err(&pdev->dev, "Fail to get pclk\n");
 		return PTR_ERR(zx_i2s->dai_pclk);
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	zx_i2s->mapbase = res->start;
 	zx_i2s->reg_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(zx_i2s->reg_base)) {
 		dev_err(&pdev->dev, "ioremap failed!\n");
 		return PTR_ERR(zx_i2s->reg_base);
 	}

 	writel_relaxed(0, zx_i2s->reg_base + ZX_I2S_FIFO_CTRL);
 	platform_set_drvdata(pdev, zx_i2s);

 	ret = devm_snd_soc_register_component(&pdev->dev, &zx_i2s_component,
 					      &zx_i2s_dai, 1);
 	if (ret) {
 		dev_err(&pdev->dev, "Register DAI failed: %d\n", ret);
 		return ret;
 	}

 	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 	if (ret)
 		dev_err(&pdev->dev, "Register platform PCM failed: %d\n", ret);

 	return ret;
 }

 static const struct of_device_id zx_i2s_dt_ids[] = {
 	{ .compatible = "zte,zx296702-i2s", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, zx_i2s_dt_ids);

 static struct platform_driver i2s_driver = {
 	.probe = zx_i2s_probe,
 	.driver = {
 		.name = "zx-i2s",
 		.of_match_table = zx_i2s_dt_ids,
 	},
 };

 module_platform_driver(i2s_driver);

 MODULE_AUTHOR("Jun Nie <jun.nie@linaro.org>");
 MODULE_DESCRIPTION("ZTE I2S SoC DAI");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (C) 2015 Linaro
	*
	* Author: Jun Nie <jun.nie@linaro.org>
	*/

	#include <linux/clk.h>
	#include <linux/device.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/soc-dai.h>

	#include <sound/core.h>
	#include <sound/dmaengine_pcm.h>
	#include <sound/initval.h>

	#define ZX_I2S_PROCESS_CTRL 0x04
	#define ZX_I2S_TIMING_CTRL 0x08
	#define ZX_I2S_FIFO_CTRL 0x0C
	#define ZX_I2S_FIFO_STATUS 0x10
	#define ZX_I2S_INT_EN 0x14
	#define ZX_I2S_INT_STATUS 0x18
	#define ZX_I2S_DATA 0x1C
	#define ZX_I2S_FRAME_CNTR 0x20

	#define I2S_DEAGULT_FIFO_THRES (0x10)
	#define I2S_MAX_FIFO_THRES (0x20)

	#define ZX_I2S_PROCESS_TX_EN (1 << 0)
	#define ZX_I2S_PROCESS_TX_DIS (0 << 0)
	#define ZX_I2S_PROCESS_RX_EN (1 << 1)
	#define ZX_I2S_PROCESS_RX_DIS (0 << 1)
	#define ZX_I2S_PROCESS_I2S_EN (1 << 2)
	#define ZX_I2S_PROCESS_I2S_DIS (0 << 2)

	#define ZX_I2S_TIMING_MAST (1 << 0)
	#define ZX_I2S_TIMING_SLAVE (0 << 0)
	#define ZX_I2S_TIMING_MS_MASK (1 << 0)
	#define ZX_I2S_TIMING_LOOP (1 << 1)
	#define ZX_I2S_TIMING_NOR (0 << 1)
	#define ZX_I2S_TIMING_LOOP_MASK (1 << 1)
	#define ZX_I2S_TIMING_PTNR (1 << 2)
	#define ZX_I2S_TIMING_NTPR (0 << 2)
	#define ZX_I2S_TIMING_PHASE_MASK (1 << 2)
	#define ZX_I2S_TIMING_TDM (1 << 3)
	#define ZX_I2S_TIMING_I2S (0 << 3)
	#define ZX_I2S_TIMING_TIMING_MASK (1 << 3)
	#define ZX_I2S_TIMING_LONG_SYNC (1 << 4)
	#define ZX_I2S_TIMING_SHORT_SYNC (0 << 4)
	#define ZX_I2S_TIMING_SYNC_MASK (1 << 4)
	#define ZX_I2S_TIMING_TEAK_EN (1 << 5)
	#define ZX_I2S_TIMING_TEAK_DIS (0 << 5)
	#define ZX_I2S_TIMING_TEAK_MASK (1 << 5)
	#define ZX_I2S_TIMING_STD_I2S (0 << 6)
	#define ZX_I2S_TIMING_MSB_JUSTIF (1 << 6)
	#define ZX_I2S_TIMING_LSB_JUSTIF (2 << 6)
	#define ZX_I2S_TIMING_ALIGN_MASK (3 << 6)
	#define ZX_I2S_TIMING_CHN_MASK (7 << 8)
	#define ZX_I2S_TIMING_CHN(x) ((x - 1) << 8)
	#define ZX_I2S_TIMING_LANE_MASK (3 << 11)
	#define ZX_I2S_TIMING_LANE(x) ((x - 1) << 11)
	#define ZX_I2S_TIMING_TSCFG_MASK (7 << 13)
	#define ZX_I2S_TIMING_TSCFG(x) (x << 13)
	#define ZX_I2S_TIMING_TS_WIDTH_MASK (0x1f << 16)
	#define ZX_I2S_TIMING_TS_WIDTH(x) ((x - 1) << 16)
	#define ZX_I2S_TIMING_DATA_SIZE_MASK (0x1f << 21)
	#define ZX_I2S_TIMING_DATA_SIZE(x) ((x - 1) << 21)
	#define ZX_I2S_TIMING_CFG_ERR_MASK (1 << 31)

	#define ZX_I2S_FIFO_CTRL_TX_RST (1 << 0)
	#define ZX_I2S_FIFO_CTRL_TX_RST_MASK (1 << 0)
	#define ZX_I2S_FIFO_CTRL_RX_RST (1 << 1)
	#define ZX_I2S_FIFO_CTRL_RX_RST_MASK (1 << 1)
	#define ZX_I2S_FIFO_CTRL_TX_DMA_EN (1 << 4)
	#define ZX_I2S_FIFO_CTRL_TX_DMA_DIS (0 << 4)
	#define ZX_I2S_FIFO_CTRL_TX_DMA_MASK (1 << 4)
	#define ZX_I2S_FIFO_CTRL_RX_DMA_EN (1 << 5)
	#define ZX_I2S_FIFO_CTRL_RX_DMA_DIS (0 << 5)
	#define ZX_I2S_FIFO_CTRL_RX_DMA_MASK (1 << 5)
	#define ZX_I2S_FIFO_CTRL_TX_THRES_MASK (0x1F << 8)
	#define ZX_I2S_FIFO_CTRL_RX_THRES_MASK (0x1F << 16)

	#define CLK_RAT (32 * 4)

	struct zx_i2s_info {
	struct snd_dmaengine_dai_dma_data dma_playback;
	struct snd_dmaengine_dai_dma_data dma_capture;
	struct clk *dai_wclk;
	struct clk *dai_pclk;
	void __iomem *reg_base;
	int master;
	resource_size_t mapbase;
	};

	static void zx_i2s_tx_en(void __iomem *base, bool on)
	{
	unsigned long val;

	val = readl_relaxed(base + ZX_I2S_PROCESS_CTRL);
	if (on)
	val \|= ZX_I2S_PROCESS_TX_EN \| ZX_I2S_PROCESS_I2S_EN;
	else
	val &= ~(ZX_I2S_PROCESS_TX_EN \| ZX_I2S_PROCESS_I2S_EN);
	writel_relaxed(val, base + ZX_I2S_PROCESS_CTRL);
	}

	static void zx_i2s_rx_en(void __iomem *base, bool on)
	{
	unsigned long val;

	val = readl_relaxed(base + ZX_I2S_PROCESS_CTRL);
	if (on)
	val \|= ZX_I2S_PROCESS_RX_EN \| ZX_I2S_PROCESS_I2S_EN;
	else
	val &= ~(ZX_I2S_PROCESS_RX_EN \| ZX_I2S_PROCESS_I2S_EN);
	writel_relaxed(val, base + ZX_I2S_PROCESS_CTRL);
	}

	static void zx_i2s_tx_dma_en(void __iomem *base, bool on)
	{
	unsigned long val;

	val = readl_relaxed(base + ZX_I2S_FIFO_CTRL);
	val \|= ZX_I2S_FIFO_CTRL_TX_RST \| (I2S_DEAGULT_FIFO_THRES << 8);
	if (on)
	val \|= ZX_I2S_FIFO_CTRL_TX_DMA_EN;
	else
	val &= ~ZX_I2S_FIFO_CTRL_TX_DMA_EN;
	writel_relaxed(val, base + ZX_I2S_FIFO_CTRL);
	}

	static void zx_i2s_rx_dma_en(void __iomem *base, bool on)
	{
	unsigned long val;

	val = readl_relaxed(base + ZX_I2S_FIFO_CTRL);
	val \|= ZX_I2S_FIFO_CTRL_RX_RST \| (I2S_DEAGULT_FIFO_THRES << 16);
	if (on)
	val \|= ZX_I2S_FIFO_CTRL_RX_DMA_EN;
	else
	val &= ~ZX_I2S_FIFO_CTRL_RX_DMA_EN;
	writel_relaxed(val, base + ZX_I2S_FIFO_CTRL);
	}

	#define ZX_I2S_RATES \
	(SNDRV_PCM_RATE_8000 \| SNDRV_PCM_RATE_11025 \| SNDRV_PCM_RATE_16000 \| \
	SNDRV_PCM_RATE_22050 \| SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \| \
	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_88200 \| SNDRV_PCM_RATE_96000\| \
	SNDRV_PCM_RATE_176400 \| SNDRV_PCM_RATE_192000)

	#define ZX_I2S_FMTBIT \
	(SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S24_LE \| \
	SNDRV_PCM_FMTBIT_S32_LE)

	static int zx_i2s_dai_probe(struct snd_soc_dai *dai)
	{
	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);

	snd_soc_dai_set_drvdata(dai, zx_i2s);
	zx_i2s->dma_playback.addr = zx_i2s->mapbase + ZX_I2S_DATA;
	zx_i2s->dma_playback.maxburst = 16;
	zx_i2s->dma_capture.addr = zx_i2s->mapbase + ZX_I2S_DATA;
	zx_i2s->dma_capture.maxburst = 16;
	snd_soc_dai_init_dma_data(dai, &zx_i2s->dma_playback,
	&zx_i2s->dma_capture);
	return 0;
	}

	static int zx_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
	{
	struct zx_i2s_info *i2s = snd_soc_dai_get_drvdata(cpu_dai);
	unsigned long val;

	val = readl_relaxed(i2s->reg_base + ZX_I2S_TIMING_CTRL);
	val &= ~(ZX_I2S_TIMING_TIMING_MASK \| ZX_I2S_TIMING_ALIGN_MASK \|
	ZX_I2S_TIMING_TEAK_MASK \| ZX_I2S_TIMING_SYNC_MASK \|
	ZX_I2S_TIMING_MS_MASK);

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	val \|= (ZX_I2S_TIMING_I2S \| ZX_I2S_TIMING_STD_I2S);
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	val \|= (ZX_I2S_TIMING_I2S \| ZX_I2S_TIMING_MSB_JUSTIF);
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	val \|= (ZX_I2S_TIMING_I2S \| ZX_I2S_TIMING_LSB_JUSTIF);
	break;
	default:
	dev_err(cpu_dai->dev, "Unknown i2s timing\n");
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	/* Codec is master, and I2S is slave. */
	i2s->master = 0;
	val \|= ZX_I2S_TIMING_SLAVE;
	break;
	case SND_SOC_DAIFMT_CBS_CFS:
	/* Codec is slave, and I2S is master. */
	i2s->master = 1;
	val \|= ZX_I2S_TIMING_MAST;
	break;
	default:
	dev_err(cpu_dai->dev, "Unknown master/slave format\n");
	return -EINVAL;
	}

	writel_relaxed(val, i2s->reg_base + ZX_I2S_TIMING_CTRL);
	return 0;
	}

	static int zx_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *socdai)
	{
	struct zx_i2s_info *i2s = snd_soc_dai_get_drvdata(socdai);
	struct snd_dmaengine_dai_dma_data *dma_data;
	unsigned int lane, ch_num, len, ret = 0;
	unsigned int ts_width = 32;
	unsigned long val;
	unsigned long chn_cfg;

	dma_data = snd_soc_dai_get_dma_data(socdai, substream);
	dma_data->addr_width = ts_width >> 3;

	val = readl_relaxed(i2s->reg_base + ZX_I2S_TIMING_CTRL);
	val &= ~(ZX_I2S_TIMING_TS_WIDTH_MASK \| ZX_I2S_TIMING_DATA_SIZE_MASK \|
	ZX_I2S_TIMING_LANE_MASK \| ZX_I2S_TIMING_CHN_MASK \|
	ZX_I2S_TIMING_TSCFG_MASK);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	len = 16;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	len = 24;
	break;
	case SNDRV_PCM_FORMAT_S32_LE:
	len = 32;
	break;
	default:
	dev_err(socdai->dev, "Unknown data format\n");
	return -EINVAL;
	}
	val \|= ZX_I2S_TIMING_TS_WIDTH(ts_width) \| ZX_I2S_TIMING_DATA_SIZE(len);

	ch_num = params_channels(params);
	switch (ch_num) {
	case 1:
	lane = 1;
	chn_cfg = 2;
	break;
	case 2:
	case 4:
	case 6:
	case 8:
	lane = ch_num / 2;
	chn_cfg = 3;
	break;
	default:
	dev_err(socdai->dev, "Not support channel num %d\n", ch_num);
	return -EINVAL;
	}
	val \|= ZX_I2S_TIMING_LANE(lane);
	val \|= ZX_I2S_TIMING_TSCFG(chn_cfg);
	val \|= ZX_I2S_TIMING_CHN(ch_num);
	writel_relaxed(val, i2s->reg_base + ZX_I2S_TIMING_CTRL);

	if (i2s->master)
	ret = clk_set_rate(i2s->dai_wclk,
	params_rate(params) * ch_num * CLK_RAT);

	return ret;
	}

	static int zx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
	int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	if (capture)
	zx_i2s_rx_dma_en(zx_i2s->reg_base, true);
	else
	zx_i2s_tx_dma_en(zx_i2s->reg_base, true);
	/* fall thru */
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	if (capture)
	zx_i2s_rx_en(zx_i2s->reg_base, true);
	else
	zx_i2s_tx_en(zx_i2s->reg_base, true);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	if (capture)
	zx_i2s_rx_dma_en(zx_i2s->reg_base, false);
	else
	zx_i2s_tx_dma_en(zx_i2s->reg_base, false);
	/* fall thru */
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	if (capture)
	zx_i2s_rx_en(zx_i2s->reg_base, false);
	else
	zx_i2s_tx_en(zx_i2s->reg_base, false);
	break;

	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static int zx_i2s_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);
	int ret;

	ret = clk_prepare_enable(zx_i2s->dai_wclk);
	if (ret)
	return ret;

	ret = clk_prepare_enable(zx_i2s->dai_pclk);
	if (ret) {
	clk_disable_unprepare(zx_i2s->dai_wclk);
	return ret;
	}

	return ret;
	}

	static void zx_i2s_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct zx_i2s_info *zx_i2s = dev_get_drvdata(dai->dev);

	clk_disable_unprepare(zx_i2s->dai_wclk);
	clk_disable_unprepare(zx_i2s->dai_pclk);
	}

	static const struct snd_soc_dai_ops zx_i2s_dai_ops = {
	.trigger = zx_i2s_trigger,
	.hw_params = zx_i2s_hw_params,
	.set_fmt = zx_i2s_set_fmt,
	.startup = zx_i2s_startup,
	.shutdown = zx_i2s_shutdown,
	};

	static const struct snd_soc_component_driver zx_i2s_component = {
	.name = "zx-i2s",
	};

	static struct snd_soc_dai_driver zx_i2s_dai = {
	.name = "zx-i2s-dai",
	.id = 0,
	.probe = zx_i2s_dai_probe,
	.playback = {
	.channels_min = 1,
	.channels_max = 8,
	.rates = ZX_I2S_RATES,
	.formats = ZX_I2S_FMTBIT,
	},
	.capture = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = ZX_I2S_RATES,
	.formats = ZX_I2S_FMTBIT,
	},
	.ops = &zx_i2s_dai_ops,
	};

	static int zx_i2s_probe(struct platform_device *pdev)
	{
	struct resource *res;
	struct zx_i2s_info *zx_i2s;
	int ret;

	zx_i2s = devm_kzalloc(&pdev->dev, sizeof(*zx_i2s), GFP_KERNEL);
	if (!zx_i2s)
	return -ENOMEM;

	zx_i2s->dai_wclk = devm_clk_get(&pdev->dev, "wclk");
	if (IS_ERR(zx_i2s->dai_wclk)) {
	dev_err(&pdev->dev, "Fail to get wclk\n");
	return PTR_ERR(zx_i2s->dai_wclk);
	}

	zx_i2s->dai_pclk = devm_clk_get(&pdev->dev, "pclk");
	if (IS_ERR(zx_i2s->dai_pclk)) {
	dev_err(&pdev->dev, "Fail to get pclk\n");
	return PTR_ERR(zx_i2s->dai_pclk);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	zx_i2s->mapbase = res->start;
	zx_i2s->reg_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(zx_i2s->reg_base)) {
	dev_err(&pdev->dev, "ioremap failed!\n");
	return PTR_ERR(zx_i2s->reg_base);
	}

	writel_relaxed(0, zx_i2s->reg_base + ZX_I2S_FIFO_CTRL);
	platform_set_drvdata(pdev, zx_i2s);

	ret = devm_snd_soc_register_component(&pdev->dev, &zx_i2s_component,
	&zx_i2s_dai, 1);
	if (ret) {
	dev_err(&pdev->dev, "Register DAI failed: %d\n", ret);
	return ret;
	}

	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
	if (ret)
	dev_err(&pdev->dev, "Register platform PCM failed: %d\n", ret);

	return ret;
	}

	static const struct of_device_id zx_i2s_dt_ids[] = {
	{ .compatible = "zte,zx296702-i2s", },
	{}
	};
	MODULE_DEVICE_TABLE(of, zx_i2s_dt_ids);

	static struct platform_driver i2s_driver = {
	.probe = zx_i2s_probe,
	.driver = {
	.name = "zx-i2s",
	.of_match_table = zx_i2s_dt_ids,
	},
	};

	module_platform_driver(i2s_driver);

	MODULE_AUTHOR("Jun Nie <jun.nie@linaro.org>");
	MODULE_DESCRIPTION("ZTE I2S SoC DAI");
	MODULE_LICENSE("GPL");