sound/soc/jz4740/jz4740-i2s.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  */

 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/initval.h>
 #include <sound/dmaengine_pcm.h>

 #define JZ_REG_AIC_CONF		0x00
 #define JZ_REG_AIC_CTRL		0x04
 #define JZ_REG_AIC_I2S_FMT	0x10
 #define JZ_REG_AIC_FIFO_STATUS	0x14
 #define JZ_REG_AIC_I2S_STATUS	0x1c
 #define JZ_REG_AIC_CLK_DIV	0x30
 #define JZ_REG_AIC_FIFO		0x34

 #define JZ_AIC_CONF_OVERFLOW_PLAY_LAST	BIT(6)
 #define JZ_AIC_CONF_INTERNAL_CODEC	BIT(5)
 #define JZ_AIC_CONF_I2S			BIT(4)
 #define JZ_AIC_CONF_RESET		BIT(3)
 #define JZ_AIC_CONF_BIT_CLK_MASTER	BIT(2)
 #define JZ_AIC_CONF_SYNC_CLK_MASTER	BIT(1)
 #define JZ_AIC_CONF_ENABLE		BIT(0)

 #define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE	GENMASK(21, 19)
 #define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE	GENMASK(18, 16)
 #define JZ_AIC_CTRL_ENABLE_RX_DMA	BIT(15)
 #define JZ_AIC_CTRL_ENABLE_TX_DMA	BIT(14)
 #define JZ_AIC_CTRL_MONO_TO_STEREO	BIT(11)
 #define JZ_AIC_CTRL_SWITCH_ENDIANNESS	BIT(10)
 #define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED	BIT(9)
 #define JZ_AIC_CTRL_TFLUSH		BIT(8)
 #define JZ_AIC_CTRL_RFLUSH		BIT(7)
 #define JZ_AIC_CTRL_ENABLE_ROR_INT	BIT(6)
 #define JZ_AIC_CTRL_ENABLE_TUR_INT	BIT(5)
 #define JZ_AIC_CTRL_ENABLE_RFS_INT	BIT(4)
 #define JZ_AIC_CTRL_ENABLE_TFS_INT	BIT(3)
 #define JZ_AIC_CTRL_ENABLE_LOOPBACK	BIT(2)
 #define JZ_AIC_CTRL_ENABLE_PLAYBACK	BIT(1)
 #define JZ_AIC_CTRL_ENABLE_CAPTURE	BIT(0)

 #define JZ_AIC_I2S_FMT_DISABLE_BIT_CLK	BIT(12)
 #define JZ_AIC_I2S_FMT_DISABLE_BIT_ICLK	BIT(13)
 #define JZ_AIC_I2S_FMT_ENABLE_SYS_CLK	BIT(4)
 #define JZ_AIC_I2S_FMT_MSB		BIT(0)

 #define JZ_AIC_I2S_STATUS_BUSY		BIT(2)

 struct i2s_soc_info {
 	struct snd_soc_dai_driver *dai;

 	struct reg_field field_rx_fifo_thresh;
 	struct reg_field field_tx_fifo_thresh;
 	struct reg_field field_i2sdiv_capture;
 	struct reg_field field_i2sdiv_playback;

 	bool shared_fifo_flush;
 };

 struct jz4740_i2s {
 	struct regmap *regmap;

 	struct regmap_field *field_rx_fifo_thresh;
 	struct regmap_field *field_tx_fifo_thresh;
 	struct regmap_field *field_i2sdiv_capture;
 	struct regmap_field *field_i2sdiv_playback;

 	struct clk *clk_aic;
 	struct clk *clk_i2s;

 	struct snd_dmaengine_dai_dma_data playback_dma_data;
 	struct snd_dmaengine_dai_dma_data capture_dma_data;

 	const struct i2s_soc_info *soc_info;
 };

 static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	int ret;

 	/*
 	 * When we can flush FIFOs independently, only flush the FIFO
 	 * that is starting up. We can do this when the DAI is active
 	 * because it does not disturb other active substreams.
 	 */
 	if (!i2s->soc_info->shared_fifo_flush) {
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_TFLUSH);
 		else
 			regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_RFLUSH);
 	}

 	if (snd_soc_dai_active(dai))
 		return 0;

 	/*
 	 * When there is a shared flush bit for both FIFOs, the TFLUSH
 	 * bit flushes both FIFOs. Flushing while the DAI is active would
 	 * cause FIFO underruns in other active substreams so we have to
 	 * guard this behind the snd_soc_dai_active() check.
 	 */
 	if (i2s->soc_info->shared_fifo_flush)
 		regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_TFLUSH);

 	ret = clk_prepare_enable(i2s->clk_i2s);
 	if (ret)
 		return ret;

 	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
 	return 0;
 }

 static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

 	if (snd_soc_dai_active(dai))
 		return;

 	regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);

 	clk_disable_unprepare(i2s->clk_i2s);
 }

 static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	uint32_t mask;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		mask = JZ_AIC_CTRL_ENABLE_PLAYBACK | JZ_AIC_CTRL_ENABLE_TX_DMA;
 	else
 		mask = JZ_AIC_CTRL_ENABLE_CAPTURE | JZ_AIC_CTRL_ENABLE_RX_DMA;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, mask);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CTRL, mask);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	const unsigned int conf_mask = JZ_AIC_CONF_BIT_CLK_MASTER |
 				       JZ_AIC_CONF_SYNC_CLK_MASTER;
 	unsigned int conf = 0, format = 0;

 	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
 	case SND_SOC_DAIFMT_BP_FP:
 		conf |= JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER;
 		format |= JZ_AIC_I2S_FMT_ENABLE_SYS_CLK;
 		break;
 	case SND_SOC_DAIFMT_BC_FP:
 		conf |= JZ_AIC_CONF_SYNC_CLK_MASTER;
 		break;
 	case SND_SOC_DAIFMT_BP_FC:
 		conf |= JZ_AIC_CONF_BIT_CLK_MASTER;
 		break;
 	case SND_SOC_DAIFMT_BC_FC:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_MSB:
 		format |= JZ_AIC_I2S_FMT_MSB;
 		break;
 	case SND_SOC_DAIFMT_I2S:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(i2s->regmap, JZ_REG_AIC_CONF, conf_mask, conf);
 	regmap_write(i2s->regmap, JZ_REG_AIC_I2S_FMT, format);

 	return 0;
 }

 static int jz4740_i2s_get_i2sdiv(unsigned long mclk, unsigned long rate,
 				 unsigned long i2sdiv_max)
 {
 	unsigned long div, rate1, rate2, err1, err2;

 	div = mclk / (64 * rate);
 	if (div == 0)
 		div = 1;

 	rate1 = mclk / (64 * div);
 	rate2 = mclk / (64 * (div + 1));

 	err1 = abs(rate1 - rate);
 	err2 = abs(rate2 - rate);

 	/*
 	 * Choose the divider that produces the smallest error in the
 	 * output rate and reject dividers with a 5% or higher error.
 	 * In the event that both dividers are outside the acceptable
 	 * error margin, reject the rate to prevent distorted audio.
 	 * (The number 5% is arbitrary.)
 	 */
 	if (div <= i2sdiv_max && err1 <= err2 && err1 < rate/20)
 		return div;
 	if (div < i2sdiv_max && err2 < rate/20)
 		return div + 1;

 	return -EINVAL;
 }

 static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	struct regmap_field *div_field;
 	unsigned long i2sdiv_max;
 	unsigned int sample_size;
 	uint32_t ctrl, conf;
 	int div = 1;

 	regmap_read(i2s->regmap, JZ_REG_AIC_CTRL, &ctrl);
 	regmap_read(i2s->regmap, JZ_REG_AIC_CONF, &conf);

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S8:
 		sample_size = 0;
 		break;
 	case SNDRV_PCM_FORMAT_S16_LE:
 		sample_size = 1;
 		break;
 	case SNDRV_PCM_FORMAT_S20_LE:
 		sample_size = 3;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		sample_size = 4;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		ctrl &= ~JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE;
 		ctrl |= FIELD_PREP(JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE, sample_size);

 		if (params_channels(params) == 1)
 			ctrl |= JZ_AIC_CTRL_MONO_TO_STEREO;
 		else
 			ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO;

 		div_field = i2s->field_i2sdiv_playback;
 		i2sdiv_max = GENMASK(i2s->soc_info->field_i2sdiv_playback.msb,
 				     i2s->soc_info->field_i2sdiv_playback.lsb);
 	} else {
 		ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE;
 		ctrl |= FIELD_PREP(JZ_AIC_CTRL_INPUT_SAMPLE_SIZE, sample_size);

 		div_field = i2s->field_i2sdiv_capture;
 		i2sdiv_max = GENMASK(i2s->soc_info->field_i2sdiv_capture.msb,
 				     i2s->soc_info->field_i2sdiv_capture.lsb);
 	}

 	/*
 	 * Only calculate I2SDIV if we're supplying the bit or frame clock.
 	 * If the codec is supplying both clocks then the divider output is
 	 * unused, and we don't want it to limit the allowed sample rates.
 	 */
 	if (conf & (JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER)) {
 		div = jz4740_i2s_get_i2sdiv(clk_get_rate(i2s->clk_i2s),
 					    params_rate(params), i2sdiv_max);
 		if (div < 0)
 			return div;
 	}

 	regmap_write(i2s->regmap, JZ_REG_AIC_CTRL, ctrl);
 	regmap_field_write(div_field, div - 1);

 	return 0;
 }

 static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

 	snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
 		&i2s->capture_dma_data);

 	return 0;
 }

 static const struct snd_soc_dai_ops jz4740_i2s_dai_ops = {
 	.startup = jz4740_i2s_startup,
 	.shutdown = jz4740_i2s_shutdown,
 	.trigger = jz4740_i2s_trigger,
 	.hw_params = jz4740_i2s_hw_params,
 	.set_fmt = jz4740_i2s_set_fmt,
 };

 #define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \
 			 SNDRV_PCM_FMTBIT_S16_LE | \
 			 SNDRV_PCM_FMTBIT_S20_LE | \
 			 SNDRV_PCM_FMTBIT_S24_LE)

 static struct snd_soc_dai_driver jz4740_i2s_dai = {
 	.probe = jz4740_i2s_dai_probe,
 	.playback = {
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
 		.formats = JZ4740_I2S_FMTS,
 	},
 	.capture = {
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
 		.formats = JZ4740_I2S_FMTS,
 	},
 	.symmetric_rate = 1,
 	.ops = &jz4740_i2s_dai_ops,
 };

 static const struct i2s_soc_info jz4740_i2s_soc_info = {
 	.dai			= &jz4740_i2s_dai,
 	.field_rx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 12, 15),
 	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 8, 11),
 	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
 	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
 	.shared_fifo_flush	= true,
 };

 static const struct i2s_soc_info jz4760_i2s_soc_info = {
 	.dai			= &jz4740_i2s_dai,
 	.field_rx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
 	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
 	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
 	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
 };

 static struct snd_soc_dai_driver jz4770_i2s_dai = {
 	.probe = jz4740_i2s_dai_probe,
 	.playback = {
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
 		.formats = JZ4740_I2S_FMTS,
 	},
 	.capture = {
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_CONTINUOUS,
 		.formats = JZ4740_I2S_FMTS,
 	},
 	.ops = &jz4740_i2s_dai_ops,
 };

 static const struct i2s_soc_info jz4770_i2s_soc_info = {
 	.dai			= &jz4770_i2s_dai,
 	.field_rx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
 	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
 	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
 	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
 };

 static const struct i2s_soc_info jz4780_i2s_soc_info = {
 	.dai			= &jz4770_i2s_dai,
 	.field_rx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
 	.field_tx_fifo_thresh	= REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
 	.field_i2sdiv_capture	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
 	.field_i2sdiv_playback	= REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
 };

 static int jz4740_i2s_suspend(struct snd_soc_component *component)
 {
 	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);

 	if (snd_soc_component_active(component)) {
 		regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
 		clk_disable_unprepare(i2s->clk_i2s);
 	}

 	clk_disable_unprepare(i2s->clk_aic);

 	return 0;
 }

 static int jz4740_i2s_resume(struct snd_soc_component *component)
 {
 	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);
 	int ret;

 	ret = clk_prepare_enable(i2s->clk_aic);
 	if (ret)
 		return ret;

 	if (snd_soc_component_active(component)) {
 		ret = clk_prepare_enable(i2s->clk_i2s);
 		if (ret) {
 			clk_disable_unprepare(i2s->clk_aic);
 			return ret;
 		}

 		regmap_set_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
 	}

 	return 0;
 }

 static int jz4740_i2s_probe(struct snd_soc_component *component)
 {
 	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);
 	int ret;

 	ret = clk_prepare_enable(i2s->clk_aic);
 	if (ret)
 		return ret;

 	regmap_write(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);

 	regmap_write(i2s->regmap, JZ_REG_AIC_CONF,
 		     JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
 		     JZ_AIC_CONF_I2S | JZ_AIC_CONF_INTERNAL_CODEC);

 	regmap_field_write(i2s->field_rx_fifo_thresh, 7);
 	regmap_field_write(i2s->field_tx_fifo_thresh, 8);

 	return 0;
 }

 static void jz4740_i2s_remove(struct snd_soc_component *component)
 {
 	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);

 	clk_disable_unprepare(i2s->clk_aic);
 }

 static const struct snd_soc_component_driver jz4740_i2s_component = {
 	.name			= "jz4740-i2s",
 	.probe			= jz4740_i2s_probe,
 	.remove			= jz4740_i2s_remove,
 	.suspend		= jz4740_i2s_suspend,
 	.resume			= jz4740_i2s_resume,
 	.legacy_dai_naming	= 1,
 };

 static const struct of_device_id jz4740_of_matches[] = {
 	{ .compatible = "ingenic,jz4740-i2s", .data = &jz4740_i2s_soc_info },
 	{ .compatible = "ingenic,jz4760-i2s", .data = &jz4760_i2s_soc_info },
 	{ .compatible = "ingenic,jz4770-i2s", .data = &jz4770_i2s_soc_info },
 	{ .compatible = "ingenic,jz4780-i2s", .data = &jz4780_i2s_soc_info },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, jz4740_of_matches);

 static int jz4740_i2s_init_regmap_fields(struct device *dev,
 					 struct jz4740_i2s *i2s)
 {
 	i2s->field_rx_fifo_thresh =
 		devm_regmap_field_alloc(dev, i2s->regmap,
 					i2s->soc_info->field_rx_fifo_thresh);
 	if (IS_ERR(i2s->field_rx_fifo_thresh))
 		return PTR_ERR(i2s->field_rx_fifo_thresh);

 	i2s->field_tx_fifo_thresh =
 		devm_regmap_field_alloc(dev, i2s->regmap,
 					i2s->soc_info->field_tx_fifo_thresh);
 	if (IS_ERR(i2s->field_tx_fifo_thresh))
 		return PTR_ERR(i2s->field_tx_fifo_thresh);

 	i2s->field_i2sdiv_capture =
 		devm_regmap_field_alloc(dev, i2s->regmap,
 					i2s->soc_info->field_i2sdiv_capture);
 	if (IS_ERR(i2s->field_i2sdiv_capture))
 		return PTR_ERR(i2s->field_i2sdiv_capture);

 	i2s->field_i2sdiv_playback =
 		devm_regmap_field_alloc(dev, i2s->regmap,
 					i2s->soc_info->field_i2sdiv_playback);
 	if (IS_ERR(i2s->field_i2sdiv_playback))
 		return PTR_ERR(i2s->field_i2sdiv_playback);

 	return 0;
 }

 static const struct regmap_config jz4740_i2s_regmap_config = {
 	.reg_bits	= 32,
 	.reg_stride	= 4,
 	.val_bits	= 32,
 	.max_register	= JZ_REG_AIC_FIFO,
 };

 static int jz4740_i2s_dev_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct jz4740_i2s *i2s;
 	struct resource *mem;
 	void __iomem *regs;
 	int ret;

 	i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
 	if (!i2s)
 		return -ENOMEM;

 	i2s->soc_info = device_get_match_data(dev);

 	regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);

 	i2s->playback_dma_data.maxburst = 16;
 	i2s->playback_dma_data.addr = mem->start + JZ_REG_AIC_FIFO;

 	i2s->capture_dma_data.maxburst = 16;
 	i2s->capture_dma_data.addr = mem->start + JZ_REG_AIC_FIFO;

 	i2s->clk_aic = devm_clk_get(dev, "aic");
 	if (IS_ERR(i2s->clk_aic))
 		return PTR_ERR(i2s->clk_aic);

 	i2s->clk_i2s = devm_clk_get(dev, "i2s");
 	if (IS_ERR(i2s->clk_i2s))
 		return PTR_ERR(i2s->clk_i2s);

 	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 					    &jz4740_i2s_regmap_config);
 	if (IS_ERR(i2s->regmap))
 		return PTR_ERR(i2s->regmap);

 	ret = jz4740_i2s_init_regmap_fields(dev, i2s);
 	if (ret)
 		return ret;

 	platform_set_drvdata(pdev, i2s);

 	ret = devm_snd_soc_register_component(dev, &jz4740_i2s_component,
 					      i2s->soc_info->dai, 1);
 	if (ret)
 		return ret;

 	return devm_snd_dmaengine_pcm_register(dev, NULL,
 		SND_DMAENGINE_PCM_FLAG_COMPAT);
 }

 static struct platform_driver jz4740_i2s_driver = {
 	.probe = jz4740_i2s_dev_probe,
 	.driver = {
 		.name = "jz4740-i2s",
 		.of_match_table = jz4740_of_matches,
 	},
 };

 module_platform_driver(jz4740_i2s_driver);

 MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
 MODULE_DESCRIPTION("Ingenic JZ4740 SoC I2S driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:jz4740-i2s");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
	*/

	#include <linux/bitfield.h>
	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/dma-mapping.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mod_devicetable.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>

	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/initval.h>
	#include <sound/dmaengine_pcm.h>

	#define JZ_REG_AIC_CONF 0x00
	#define JZ_REG_AIC_CTRL 0x04
	#define JZ_REG_AIC_I2S_FMT 0x10
	#define JZ_REG_AIC_FIFO_STATUS 0x14
	#define JZ_REG_AIC_I2S_STATUS 0x1c
	#define JZ_REG_AIC_CLK_DIV 0x30
	#define JZ_REG_AIC_FIFO 0x34

	#define JZ_AIC_CONF_OVERFLOW_PLAY_LAST BIT(6)
	#define JZ_AIC_CONF_INTERNAL_CODEC BIT(5)
	#define JZ_AIC_CONF_I2S BIT(4)
	#define JZ_AIC_CONF_RESET BIT(3)
	#define JZ_AIC_CONF_BIT_CLK_MASTER BIT(2)
	#define JZ_AIC_CONF_SYNC_CLK_MASTER BIT(1)
	#define JZ_AIC_CONF_ENABLE BIT(0)

	#define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE GENMASK(21, 19)
	#define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE GENMASK(18, 16)
	#define JZ_AIC_CTRL_ENABLE_RX_DMA BIT(15)
	#define JZ_AIC_CTRL_ENABLE_TX_DMA BIT(14)
	#define JZ_AIC_CTRL_MONO_TO_STEREO BIT(11)
	#define JZ_AIC_CTRL_SWITCH_ENDIANNESS BIT(10)
	#define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED BIT(9)
	#define JZ_AIC_CTRL_TFLUSH BIT(8)
	#define JZ_AIC_CTRL_RFLUSH BIT(7)
	#define JZ_AIC_CTRL_ENABLE_ROR_INT BIT(6)
	#define JZ_AIC_CTRL_ENABLE_TUR_INT BIT(5)
	#define JZ_AIC_CTRL_ENABLE_RFS_INT BIT(4)
	#define JZ_AIC_CTRL_ENABLE_TFS_INT BIT(3)
	#define JZ_AIC_CTRL_ENABLE_LOOPBACK BIT(2)
	#define JZ_AIC_CTRL_ENABLE_PLAYBACK BIT(1)
	#define JZ_AIC_CTRL_ENABLE_CAPTURE BIT(0)

	#define JZ_AIC_I2S_FMT_DISABLE_BIT_CLK BIT(12)
	#define JZ_AIC_I2S_FMT_DISABLE_BIT_ICLK BIT(13)
	#define JZ_AIC_I2S_FMT_ENABLE_SYS_CLK BIT(4)
	#define JZ_AIC_I2S_FMT_MSB BIT(0)

	#define JZ_AIC_I2S_STATUS_BUSY BIT(2)

	struct i2s_soc_info {
	struct snd_soc_dai_driver *dai;

	struct reg_field field_rx_fifo_thresh;
	struct reg_field field_tx_fifo_thresh;
	struct reg_field field_i2sdiv_capture;
	struct reg_field field_i2sdiv_playback;

	bool shared_fifo_flush;
	};

	struct jz4740_i2s {
	struct regmap *regmap;

	struct regmap_field *field_rx_fifo_thresh;
	struct regmap_field *field_tx_fifo_thresh;
	struct regmap_field *field_i2sdiv_capture;
	struct regmap_field *field_i2sdiv_playback;

	struct clk *clk_aic;
	struct clk *clk_i2s;

	struct snd_dmaengine_dai_dma_data playback_dma_data;
	struct snd_dmaengine_dai_dma_data capture_dma_data;

	const struct i2s_soc_info *soc_info;
	};

	static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	int ret;

	/*
	* When we can flush FIFOs independently, only flush the FIFO
	* that is starting up. We can do this when the DAI is active
	* because it does not disturb other active substreams.
	*/
	if (!i2s->soc_info->shared_fifo_flush) {
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_TFLUSH);
	else
	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_RFLUSH);
	}

	if (snd_soc_dai_active(dai))
	return 0;

	/*
	* When there is a shared flush bit for both FIFOs, the TFLUSH
	* bit flushes both FIFOs. Flushing while the DAI is active would
	* cause FIFO underruns in other active substreams so we have to
	* guard this behind the snd_soc_dai_active() check.
	*/
	if (i2s->soc_info->shared_fifo_flush)
	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_TFLUSH);

	ret = clk_prepare_enable(i2s->clk_i2s);
	if (ret)
	return ret;

	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
	return 0;
	}

	static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	if (snd_soc_dai_active(dai))
	return;

	regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);

	clk_disable_unprepare(i2s->clk_i2s);
	}

	static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	uint32_t mask;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	mask = JZ_AIC_CTRL_ENABLE_PLAYBACK \| JZ_AIC_CTRL_ENABLE_TX_DMA;
	else
	mask = JZ_AIC_CTRL_ENABLE_CAPTURE \| JZ_AIC_CTRL_ENABLE_RX_DMA;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CTRL, mask);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CTRL, mask);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	const unsigned int conf_mask = JZ_AIC_CONF_BIT_CLK_MASTER \|
	JZ_AIC_CONF_SYNC_CLK_MASTER;
	unsigned int conf = 0, format = 0;

	switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
	case SND_SOC_DAIFMT_BP_FP:
	conf \|= JZ_AIC_CONF_BIT_CLK_MASTER \| JZ_AIC_CONF_SYNC_CLK_MASTER;
	format \|= JZ_AIC_I2S_FMT_ENABLE_SYS_CLK;
	break;
	case SND_SOC_DAIFMT_BC_FP:
	conf \|= JZ_AIC_CONF_SYNC_CLK_MASTER;
	break;
	case SND_SOC_DAIFMT_BP_FC:
	conf \|= JZ_AIC_CONF_BIT_CLK_MASTER;
	break;
	case SND_SOC_DAIFMT_BC_FC:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_MSB:
	format \|= JZ_AIC_I2S_FMT_MSB;
	break;
	case SND_SOC_DAIFMT_I2S:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, JZ_REG_AIC_CONF, conf_mask, conf);
	regmap_write(i2s->regmap, JZ_REG_AIC_I2S_FMT, format);

	return 0;
	}

	static int jz4740_i2s_get_i2sdiv(unsigned long mclk, unsigned long rate,
	unsigned long i2sdiv_max)
	{
	unsigned long div, rate1, rate2, err1, err2;

	div = mclk / (64 * rate);
	if (div == 0)
	div = 1;

	rate1 = mclk / (64 * div);
	rate2 = mclk / (64 * (div + 1));

	err1 = abs(rate1 - rate);
	err2 = abs(rate2 - rate);

	/*
	* Choose the divider that produces the smallest error in the
	* output rate and reject dividers with a 5% or higher error.
	* In the event that both dividers are outside the acceptable
	* error margin, reject the rate to prevent distorted audio.
	* (The number 5% is arbitrary.)
	*/
	if (div <= i2sdiv_max && err1 <= err2 && err1 < rate/20)
	return div;
	if (div < i2sdiv_max && err2 < rate/20)
	return div + 1;

	return -EINVAL;
	}

	static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params params, struct snd_soc_dai dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	struct regmap_field *div_field;
	unsigned long i2sdiv_max;
	unsigned int sample_size;
	uint32_t ctrl, conf;
	int div = 1;

	regmap_read(i2s->regmap, JZ_REG_AIC_CTRL, &ctrl);
	regmap_read(i2s->regmap, JZ_REG_AIC_CONF, &conf);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
	sample_size = 0;
	break;
	case SNDRV_PCM_FORMAT_S16_LE:
	sample_size = 1;
	break;
	case SNDRV_PCM_FORMAT_S20_LE:
	sample_size = 3;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	sample_size = 4;
	break;
	default:
	return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	ctrl &= ~JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE;
	ctrl \|= FIELD_PREP(JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE, sample_size);

	if (params_channels(params) == 1)
	ctrl \|= JZ_AIC_CTRL_MONO_TO_STEREO;
	else
	ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO;

	div_field = i2s->field_i2sdiv_playback;
	i2sdiv_max = GENMASK(i2s->soc_info->field_i2sdiv_playback.msb,
	i2s->soc_info->field_i2sdiv_playback.lsb);
	} else {
	ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE;
	ctrl \|= FIELD_PREP(JZ_AIC_CTRL_INPUT_SAMPLE_SIZE, sample_size);

	div_field = i2s->field_i2sdiv_capture;
	i2sdiv_max = GENMASK(i2s->soc_info->field_i2sdiv_capture.msb,
	i2s->soc_info->field_i2sdiv_capture.lsb);
	}

	/*
	* Only calculate I2SDIV if we're supplying the bit or frame clock.
	* If the codec is supplying both clocks then the divider output is
	* unused, and we don't want it to limit the allowed sample rates.
	*/
	if (conf & (JZ_AIC_CONF_BIT_CLK_MASTER \| JZ_AIC_CONF_SYNC_CLK_MASTER)) {
	div = jz4740_i2s_get_i2sdiv(clk_get_rate(i2s->clk_i2s),
	params_rate(params), i2sdiv_max);
	if (div < 0)
	return div;
	}

	regmap_write(i2s->regmap, JZ_REG_AIC_CTRL, ctrl);
	regmap_field_write(div_field, div - 1);

	return 0;
	}

	static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
	&i2s->capture_dma_data);

	return 0;
	}

	static const struct snd_soc_dai_ops jz4740_i2s_dai_ops = {
	.startup = jz4740_i2s_startup,
	.shutdown = jz4740_i2s_shutdown,
	.trigger = jz4740_i2s_trigger,
	.hw_params = jz4740_i2s_hw_params,
	.set_fmt = jz4740_i2s_set_fmt,
	};

	#define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 \| \
	SNDRV_PCM_FMTBIT_S16_LE \| \
	SNDRV_PCM_FMTBIT_S20_LE \| \
	SNDRV_PCM_FMTBIT_S24_LE)

	static struct snd_soc_dai_driver jz4740_i2s_dai = {
	.probe = jz4740_i2s_dai_probe,
	.playback = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	.formats = JZ4740_I2S_FMTS,
	},
	.capture = {
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	.formats = JZ4740_I2S_FMTS,
	},
	.symmetric_rate = 1,
	.ops = &jz4740_i2s_dai_ops,
	};

	static const struct i2s_soc_info jz4740_i2s_soc_info = {
	.dai = &jz4740_i2s_dai,
	.field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 12, 15),
	.field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 8, 11),
	.field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
	.field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
	.shared_fifo_flush = true,
	};

	static const struct i2s_soc_info jz4760_i2s_soc_info = {
	.dai = &jz4740_i2s_dai,
	.field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
	.field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
	.field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
	.field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
	};

	static struct snd_soc_dai_driver jz4770_i2s_dai = {
	.probe = jz4740_i2s_dai_probe,
	.playback = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	.formats = JZ4740_I2S_FMTS,
	},
	.capture = {
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_CONTINUOUS,
	.formats = JZ4740_I2S_FMTS,
	},
	.ops = &jz4740_i2s_dai_ops,
	};

	static const struct i2s_soc_info jz4770_i2s_soc_info = {
	.dai = &jz4770_i2s_dai,
	.field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
	.field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
	.field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
	.field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
	};

	static const struct i2s_soc_info jz4780_i2s_soc_info = {
	.dai = &jz4770_i2s_dai,
	.field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
	.field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
	.field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
	.field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
	};

	static int jz4740_i2s_suspend(struct snd_soc_component *component)
	{
	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);

	if (snd_soc_component_active(component)) {
	regmap_clear_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
	clk_disable_unprepare(i2s->clk_i2s);
	}

	clk_disable_unprepare(i2s->clk_aic);

	return 0;
	}

	static int jz4740_i2s_resume(struct snd_soc_component *component)
	{
	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);
	int ret;

	ret = clk_prepare_enable(i2s->clk_aic);
	if (ret)
	return ret;

	if (snd_soc_component_active(component)) {
	ret = clk_prepare_enable(i2s->clk_i2s);
	if (ret) {
	clk_disable_unprepare(i2s->clk_aic);
	return ret;
	}

	regmap_set_bits(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_ENABLE);
	}

	return 0;
	}

	static int jz4740_i2s_probe(struct snd_soc_component *component)
	{
	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);
	int ret;

	ret = clk_prepare_enable(i2s->clk_aic);
	if (ret)
	return ret;

	regmap_write(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);

	regmap_write(i2s->regmap, JZ_REG_AIC_CONF,
	JZ_AIC_CONF_OVERFLOW_PLAY_LAST \|
	JZ_AIC_CONF_I2S \| JZ_AIC_CONF_INTERNAL_CODEC);

	regmap_field_write(i2s->field_rx_fifo_thresh, 7);
	regmap_field_write(i2s->field_tx_fifo_thresh, 8);

	return 0;
	}

	static void jz4740_i2s_remove(struct snd_soc_component *component)
	{
	struct jz4740_i2s *i2s = snd_soc_component_get_drvdata(component);

	clk_disable_unprepare(i2s->clk_aic);
	}

	static const struct snd_soc_component_driver jz4740_i2s_component = {
	.name = "jz4740-i2s",
	.probe = jz4740_i2s_probe,
	.remove = jz4740_i2s_remove,
	.suspend = jz4740_i2s_suspend,
	.resume = jz4740_i2s_resume,
	.legacy_dai_naming = 1,
	};

	static const struct of_device_id jz4740_of_matches[] = {
	{ .compatible = "ingenic,jz4740-i2s", .data = &jz4740_i2s_soc_info },
	{ .compatible = "ingenic,jz4760-i2s", .data = &jz4760_i2s_soc_info },
	{ .compatible = "ingenic,jz4770-i2s", .data = &jz4770_i2s_soc_info },
	{ .compatible = "ingenic,jz4780-i2s", .data = &jz4780_i2s_soc_info },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, jz4740_of_matches);

	static int jz4740_i2s_init_regmap_fields(struct device *dev,
	struct jz4740_i2s *i2s)
	{
	i2s->field_rx_fifo_thresh =
	devm_regmap_field_alloc(dev, i2s->regmap,
	i2s->soc_info->field_rx_fifo_thresh);
	if (IS_ERR(i2s->field_rx_fifo_thresh))
	return PTR_ERR(i2s->field_rx_fifo_thresh);

	i2s->field_tx_fifo_thresh =
	devm_regmap_field_alloc(dev, i2s->regmap,
	i2s->soc_info->field_tx_fifo_thresh);
	if (IS_ERR(i2s->field_tx_fifo_thresh))
	return PTR_ERR(i2s->field_tx_fifo_thresh);

	i2s->field_i2sdiv_capture =
	devm_regmap_field_alloc(dev, i2s->regmap,
	i2s->soc_info->field_i2sdiv_capture);
	if (IS_ERR(i2s->field_i2sdiv_capture))
	return PTR_ERR(i2s->field_i2sdiv_capture);

	i2s->field_i2sdiv_playback =
	devm_regmap_field_alloc(dev, i2s->regmap,
	i2s->soc_info->field_i2sdiv_playback);
	if (IS_ERR(i2s->field_i2sdiv_playback))
	return PTR_ERR(i2s->field_i2sdiv_playback);

	return 0;
	}

	static const struct regmap_config jz4740_i2s_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = JZ_REG_AIC_FIFO,
	};

	static int jz4740_i2s_dev_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct jz4740_i2s *i2s;
	struct resource *mem;
	void __iomem *regs;
	int ret;

	i2s = devm_kzalloc(dev, sizeof(*i2s), GFP_KERNEL);
	if (!i2s)
	return -ENOMEM;

	i2s->soc_info = device_get_match_data(dev);

	regs = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
	if (IS_ERR(regs))
	return PTR_ERR(regs);

	i2s->playback_dma_data.maxburst = 16;
	i2s->playback_dma_data.addr = mem->start + JZ_REG_AIC_FIFO;

	i2s->capture_dma_data.maxburst = 16;
	i2s->capture_dma_data.addr = mem->start + JZ_REG_AIC_FIFO;

	i2s->clk_aic = devm_clk_get(dev, "aic");
	if (IS_ERR(i2s->clk_aic))
	return PTR_ERR(i2s->clk_aic);

	i2s->clk_i2s = devm_clk_get(dev, "i2s");
	if (IS_ERR(i2s->clk_i2s))
	return PTR_ERR(i2s->clk_i2s);

	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
	&jz4740_i2s_regmap_config);
	if (IS_ERR(i2s->regmap))
	return PTR_ERR(i2s->regmap);

	ret = jz4740_i2s_init_regmap_fields(dev, i2s);
	if (ret)
	return ret;

	platform_set_drvdata(pdev, i2s);

	ret = devm_snd_soc_register_component(dev, &jz4740_i2s_component,
	i2s->soc_info->dai, 1);
	if (ret)
	return ret;

	return devm_snd_dmaengine_pcm_register(dev, NULL,
	SND_DMAENGINE_PCM_FLAG_COMPAT);
	}

	static struct platform_driver jz4740_i2s_driver = {
	.probe = jz4740_i2s_dev_probe,
	.driver = {
	.name = "jz4740-i2s",
	.of_match_table = jz4740_of_matches,
	},
	};

	module_platform_driver(jz4740_i2s_driver);

	MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
	MODULE_DESCRIPTION("Ingenic JZ4740 SoC I2S driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:jz4740-i2s");