drivers/sound/samsung-i2s.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2012 Samsung Electronics
  * R. Chandrasekar <rcsekar@samsung.com>
  */

 #include <common.h>
 #include <dm.h>
 #include <i2s.h>
 #include <log.h>
 #include <sound.h>
 #include <asm/arch/clk.h>
 #include <asm/arch/pinmux.h>
 #include <asm/arch/i2s-regs.h>
 #include <asm/io.h>

 #define FIC_TX2COUNT(x)		(((x) >>  24) & 0xf)
 #define FIC_TX1COUNT(x)		(((x) >>  16) & 0xf)
 #define FIC_TXCOUNT(x)		(((x) >>  8) & 0xf)
 #define FIC_RXCOUNT(x)		(((x) >>  0) & 0xf)
 #define FICS_TXCOUNT(x)		(((x) >>  8) & 0x7f)

 #define TIMEOUT_I2S_TX		100	/* i2s transfer timeout */

 /*
  * Sets the frame size for I2S LR clock
  *
  * @param i2s_reg	i2s register address
  * @param rfs		Frame Size
  */
 static void i2s_set_lr_framesize(struct i2s_reg *i2s_reg, unsigned int rfs)
 {
 	unsigned int mod = readl(&i2s_reg->mod);

 	mod &= ~MOD_RCLK_MASK;

 	switch (rfs) {
 	case 768:
 		mod |= MOD_RCLK_768FS;
 		break;
 	case 512:
 		mod |= MOD_RCLK_512FS;
 		break;
 	case 384:
 		mod |= MOD_RCLK_384FS;
 		break;
 	default:
 		mod |= MOD_RCLK_256FS;
 		break;
 	}

 	writel(mod, &i2s_reg->mod);
 }

 /*
  * Sets the i2s transfer control
  *
  * @param i2s_reg	i2s register address
  * @param on		1 enable tx , 0 disable tx transfer
  */
 static void i2s_txctrl(struct i2s_reg *i2s_reg, int on)
 {
 	unsigned int con = readl(&i2s_reg->con);
 	unsigned int mod = readl(&i2s_reg->mod) & ~MOD_MASK;

 	if (on) {
 		con |= CON_ACTIVE;
 		con &= ~CON_TXCH_PAUSE;
 	} else {
 		con |=  CON_TXCH_PAUSE;
 		con &= ~CON_ACTIVE;
 	}

 	writel(mod, &i2s_reg->mod);
 	writel(con, &i2s_reg->con);
 }

 /*
  * set the bit clock frame size (in multiples of LRCLK)
  *
  * @param i2s_reg	i2s register address
  * @param bfs		bit Frame Size
  */
 static void i2s_set_bitclk_framesize(struct i2s_reg *i2s_reg, unsigned bfs)
 {
 	unsigned int mod = readl(&i2s_reg->mod);

 	mod &= ~MOD_BCLK_MASK;

 	switch (bfs) {
 	case 48:
 		mod |= MOD_BCLK_48FS;
 		break;
 	case 32:
 		mod |= MOD_BCLK_32FS;
 		break;
 	case 24:
 		mod |= MOD_BCLK_24FS;
 		break;
 	case 16:
 		mod |= MOD_BCLK_16FS;
 		break;
 	default:
 		return;
 	}
 	writel(mod, &i2s_reg->mod);
 }

 /*
  * flushes the i2stx fifo
  *
  * @param i2s_reg	i2s register address
  * @param flush		Tx fifo flush command (0x00 - do not flush
  *				0x80 - flush tx fifo)
  */
 static void i2s_fifo(struct i2s_reg *i2s_reg, unsigned int flush)
 {
 	/* Flush the FIFO */
 	setbits_le32(&i2s_reg->fic, flush);
 	clrbits_le32(&i2s_reg->fic, flush);
 }

 /*
  * Set System Clock direction
  *
  * @param i2s_reg	i2s register address
  * @param dir		Clock direction
  *
  * Return:		int value 0 for success, -1 in case of error
  */
 static int i2s_set_sysclk_dir(struct i2s_reg *i2s_reg, int dir)
 {
 	unsigned int mod = readl(&i2s_reg->mod);

 	if (dir == SND_SOC_CLOCK_IN)
 		mod |= MOD_CDCLKCON;
 	else
 		mod &= ~MOD_CDCLKCON;

 	writel(mod, &i2s_reg->mod);

 	return 0;
 }

 /*
  * Sets I2S Clcok format
  *
  * @param fmt		i2s clock properties
  * @param i2s_reg	i2s register address
  *
  * Return:		int value 0 for success, -1 in case of error
  */
 static int i2s_set_fmt(struct i2s_reg *i2s_reg, unsigned int fmt)
 {
 	unsigned int mod = readl(&i2s_reg->mod);
 	unsigned int tmp = 0;
 	unsigned int ret = 0;

 	/* Format is priority */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_RIGHT_J:
 		tmp |= MOD_LR_RLOW;
 		tmp |= MOD_SDF_MSB;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		tmp |= MOD_LR_RLOW;
 		tmp |= MOD_SDF_LSB;
 		break;
 	case SND_SOC_DAIFMT_I2S:
 		tmp |= MOD_SDF_IIS;
 		break;
 	default:
 		debug("%s: Invalid format priority [0x%x]\n", __func__,
 		      (fmt & SND_SOC_DAIFMT_FORMAT_MASK));
 		return -ERANGE;
 	}

 	/*
 	 * INV flag is relative to the FORMAT flag - if set it simply
 	 * flips the polarity specified by the Standard
 	 */
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		if (tmp & MOD_LR_RLOW)
 			tmp &= ~MOD_LR_RLOW;
 		else
 			tmp |= MOD_LR_RLOW;
 		break;
 	default:
 		debug("%s: Invalid clock ploarity input [0x%x]\n", __func__,
 		      (fmt & SND_SOC_DAIFMT_INV_MASK));
 		return -ERANGE;
 	}

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		tmp |= MOD_SLAVE;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		/* Set default source clock in Master mode */
 		ret = i2s_set_sysclk_dir(i2s_reg, SND_SOC_CLOCK_OUT);
 		if (ret != 0) {
 			debug("%s:set i2s clock direction failed\n", __func__);
 			return ret;
 		}
 		break;
 	default:
 		debug("%s: Invalid master selection [0x%x]\n", __func__,
 		      (fmt & SND_SOC_DAIFMT_MASTER_MASK));
 		return -ERANGE;
 	}

 	mod &= ~(MOD_SDF_MASK | MOD_LR_RLOW | MOD_SLAVE);
 	mod |= tmp;
 	writel(mod, &i2s_reg->mod);

 	return 0;
 }

 /*
  * Sets the sample width in bits
  *
  * @param blc		samplewidth (size of sample in bits)
  * @param i2s_reg	i2s register address
  *
  * Return:		int value 0 for success, -1 in case of error
  */
 static int i2s_set_samplesize(struct i2s_reg *i2s_reg, unsigned int blc)
 {
 	unsigned int mod = readl(&i2s_reg->mod);

 	mod &= ~MOD_BLCP_MASK;
 	mod &= ~MOD_BLC_MASK;

 	switch (blc) {
 	case 8:
 		mod |= MOD_BLCP_8BIT;
 		mod |= MOD_BLC_8BIT;
 		break;
 	case 16:
 		mod |= MOD_BLCP_16BIT;
 		mod |= MOD_BLC_16BIT;
 		break;
 	case 24:
 		mod |= MOD_BLCP_24BIT;
 		mod |= MOD_BLC_24BIT;
 		break;
 	default:
 		debug("%s: Invalid sample size input [0x%x]\n",
 		      __func__, blc);
 		return -ERANGE;
 	}
 	writel(mod, &i2s_reg->mod);

 	return 0;
 }

 int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, void *data,
 			 uint data_size)
 {
 	struct i2s_reg *i2s_reg = (struct i2s_reg *)pi2s_tx->base_address;
 	u32 *ptr;
 	int i;
 	int start;

 	if (data_size < FIFO_LENGTH) {
 		debug("%s : Invalid data size\n", __func__);
 		return -ENODATA; /* invalid pcm data size */
 	}

 	/* fill the tx buffer before stating the tx transmit */
 	for (i = 0, ptr = data; i < FIFO_LENGTH; i++)
 		writel(*ptr++, &i2s_reg->txd);

 	data_size -= sizeof(*ptr) * FIFO_LENGTH;
 	i2s_txctrl(i2s_reg, I2S_TX_ON);

 	while (data_size > 0) {
 		start = get_timer(0);
 		if (!(CON_TXFIFO_FULL & (readl(&i2s_reg->con)))) {
 			writel(*ptr++, &i2s_reg->txd);
 			data_size -= sizeof(*ptr);
 		} else {
 			if (get_timer(start) > TIMEOUT_I2S_TX) {
 				i2s_txctrl(i2s_reg, I2S_TX_OFF);
 				debug("%s: I2S Transfer Timeout\n", __func__);
 				return -ETIMEDOUT;
 			}
 		}
 	}
 	i2s_txctrl(i2s_reg, I2S_TX_OFF);

 	return 0;
 }

 static int i2s_tx_init(struct i2s_uc_priv *pi2s_tx)
 {
 	int ret;
 	struct i2s_reg *i2s_reg = (struct i2s_reg *)pi2s_tx->base_address;

 	if (pi2s_tx->id == 0) {
 		/* Initialize GPIO for I2S-0 */
 		exynos_pinmux_config(PERIPH_ID_I2S0, 0);

 		/* Set EPLL Clock */
 		ret = set_epll_clk(pi2s_tx->samplingrate * pi2s_tx->rfs * 4);
 	} else if (pi2s_tx->id == 1) {
 		/* Initialize GPIO for I2S-1 */
 		exynos_pinmux_config(PERIPH_ID_I2S1, 0);

 		/* Set EPLL Clock */
 		ret = set_epll_clk(pi2s_tx->audio_pll_clk);
 	} else {
 		debug("%s: unsupported i2s-%d bus\n", __func__, pi2s_tx->id);
 		return -ERANGE;
 	}

 	if (ret) {
 		debug("%s: epll clock set rate failed\n", __func__);
 		return ret;
 	}

 	/* Select Clk Source for Audio 0 or 1 */
 	ret = set_i2s_clk_source(pi2s_tx->id);
 	if (ret) {
 		debug("%s: unsupported clock for i2s-%d\n", __func__,
 		      pi2s_tx->id);
 		return ret;
 	}

 	if (pi2s_tx->id == 0) {
 		/*Reset the i2s module */
 		writel(CON_RESET, &i2s_reg->con);

 		writel(MOD_OP_CLK | MOD_RCLKSRC, &i2s_reg->mod);
 		/* set i2s prescaler */
 		writel(PSREN | PSVAL, &i2s_reg->psr);
 	} else {
 		/* Set Prescaler to get MCLK */
 		ret = set_i2s_clk_prescaler(pi2s_tx->audio_pll_clk,
 				(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
 				pi2s_tx->id);
 	}
 	if (ret) {
 		debug("%s: unsupported prescalar for i2s-%d\n", __func__,
 		      pi2s_tx->id);
 		return ret;
 	}

 	/* Configure I2s format */
 	ret = i2s_set_fmt(i2s_reg, SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 			  SND_SOC_DAIFMT_CBM_CFM);
 	if (ret == 0) {
 		i2s_set_lr_framesize(i2s_reg, pi2s_tx->rfs);
 		ret = i2s_set_samplesize(i2s_reg, pi2s_tx->bitspersample);
 		if (ret != 0) {
 			debug("%s:set sample rate failed\n", __func__);
 			return ret;
 		}

 		i2s_set_bitclk_framesize(i2s_reg, pi2s_tx->bfs);
 		/* disable i2s transfer flag and flush the fifo */
 		i2s_txctrl(i2s_reg, I2S_TX_OFF);
 		i2s_fifo(i2s_reg, FIC_TXFLUSH);
 	} else {
 		debug("%s: failed\n", __func__);
 	}

 	return ret;
 }

 static int samsung_i2s_tx_data(struct udevice *dev, void *data, uint data_size)
 {
 	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);

 	return i2s_transfer_tx_data(priv, data, data_size);
 }

 static int samsung_i2s_probe(struct udevice *dev)
 {
 	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);

 	return i2s_tx_init(priv);
 }

 static int samsung_i2s_of_to_plat(struct udevice *dev)
 {
 	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
 	ulong base;

 	/*
 	 * Get the pre-defined sound specific values from FDT.
 	 * All of these are expected to be correct otherwise
 	 * wrong register values in i2s setup parameters
 	 * may result in no sound play.
 	 */
 	base = dev_read_addr(dev);
 	if (base == FDT_ADDR_T_NONE) {
 		debug("%s: Missing  i2s base\n", __func__);
 		return -EINVAL;
 	}
 	priv->base_address = base;

 	if (dev_read_u32u(dev, "samsung,i2s-epll-clock-frequency",
 			  &priv->audio_pll_clk))
 		goto err;
 	debug("audio_pll_clk = %d\n", priv->audio_pll_clk);
 	if (dev_read_u32u(dev, "samsung,i2s-sampling-rate",
 			  &priv->samplingrate))
 		goto err;
 	debug("samplingrate = %d\n", priv->samplingrate);
 	if (dev_read_u32u(dev, "samsung,i2s-bits-per-sample",
 			  &priv->bitspersample))
 		goto err;
 	debug("bitspersample = %d\n", priv->bitspersample);
 	if (dev_read_u32u(dev, "samsung,i2s-channels", &priv->channels))
 		goto err;
 	debug("channels = %d\n", priv->channels);
 	if (dev_read_u32u(dev, "samsung,i2s-lr-clk-framesize", &priv->rfs))
 		goto err;
 	debug("rfs = %d\n", priv->rfs);
 	if (dev_read_u32u(dev, "samsung,i2s-bit-clk-framesize", &priv->bfs))
 		goto err;
 	debug("bfs = %d\n", priv->bfs);

 	if (dev_read_u32u(dev, "samsung,i2s-id", &priv->id))
 		goto err;
 	debug("id = %d\n", priv->id);

 	return 0;

 err:
 	debug("fail to get sound i2s node properties\n");

 	return -EINVAL;
 }

 static const struct i2s_ops samsung_i2s_ops = {
 	.tx_data	= samsung_i2s_tx_data,
 };

 static const struct udevice_id samsung_i2s_ids[] = {
 	{ .compatible = "samsung,s5pv210-i2s" },
 	{ }
 };

 U_BOOT_DRIVER(samsung_i2s) = {
 	.name		= "samsung_i2s",
 	.id		= UCLASS_I2S,
 	.of_match	= samsung_i2s_ids,
 	.probe		= samsung_i2s_probe,
 	.of_to_plat	= samsung_i2s_of_to_plat,
 	.ops		= &samsung_i2s_ops,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2012 Samsung Electronics
	* R. Chandrasekar <rcsekar@samsung.com>
	*/

	#include <common.h>
	#include <dm.h>
	#include <i2s.h>
	#include <log.h>
	#include <sound.h>
	#include <asm/arch/clk.h>
	#include <asm/arch/pinmux.h>
	#include <asm/arch/i2s-regs.h>
	#include <asm/io.h>

	#define FIC_TX2COUNT(x) (((x) >> 24) & 0xf)
	#define FIC_TX1COUNT(x) (((x) >> 16) & 0xf)
	#define FIC_TXCOUNT(x) (((x) >> 8) & 0xf)
	#define FIC_RXCOUNT(x) (((x) >> 0) & 0xf)
	#define FICS_TXCOUNT(x) (((x) >> 8) & 0x7f)

	#define TIMEOUT_I2S_TX 100 /* i2s transfer timeout */

	/*
	* Sets the frame size for I2S LR clock
	*
	* @param i2s_reg i2s register address
	* @param rfs Frame Size
	*/
	static void i2s_set_lr_framesize(struct i2s_reg *i2s_reg, unsigned int rfs)
	{
	unsigned int mod = readl(&i2s_reg->mod);

	mod &= ~MOD_RCLK_MASK;

	switch (rfs) {
	case 768:
	mod \|= MOD_RCLK_768FS;
	break;
	case 512:
	mod \|= MOD_RCLK_512FS;
	break;
	case 384:
	mod \|= MOD_RCLK_384FS;
	break;
	default:
	mod \|= MOD_RCLK_256FS;
	break;
	}

	writel(mod, &i2s_reg->mod);
	}

	/*
	* Sets the i2s transfer control
	*
	* @param i2s_reg i2s register address
	* @param on 1 enable tx , 0 disable tx transfer
	*/
	static void i2s_txctrl(struct i2s_reg *i2s_reg, int on)
	{
	unsigned int con = readl(&i2s_reg->con);
	unsigned int mod = readl(&i2s_reg->mod) & ~MOD_MASK;

	if (on) {
	con \|= CON_ACTIVE;
	con &= ~CON_TXCH_PAUSE;
	} else {
	con \|= CON_TXCH_PAUSE;
	con &= ~CON_ACTIVE;
	}

	writel(mod, &i2s_reg->mod);
	writel(con, &i2s_reg->con);
	}

	/*
	* set the bit clock frame size (in multiples of LRCLK)
	*
	* @param i2s_reg i2s register address
	* @param bfs bit Frame Size
	*/
	static void i2s_set_bitclk_framesize(struct i2s_reg *i2s_reg, unsigned bfs)
	{
	unsigned int mod = readl(&i2s_reg->mod);

	mod &= ~MOD_BCLK_MASK;

	switch (bfs) {
	case 48:
	mod \|= MOD_BCLK_48FS;
	break;
	case 32:
	mod \|= MOD_BCLK_32FS;
	break;
	case 24:
	mod \|= MOD_BCLK_24FS;
	break;
	case 16:
	mod \|= MOD_BCLK_16FS;
	break;
	default:
	return;
	}
	writel(mod, &i2s_reg->mod);
	}

	/*
	* flushes the i2stx fifo
	*
	* @param i2s_reg i2s register address
	* @param flush Tx fifo flush command (0x00 - do not flush
	* 0x80 - flush tx fifo)
	*/
	static void i2s_fifo(struct i2s_reg *i2s_reg, unsigned int flush)
	{
	/* Flush the FIFO */
	setbits_le32(&i2s_reg->fic, flush);
	clrbits_le32(&i2s_reg->fic, flush);
	}

	/*
	* Set System Clock direction
	*
	* @param i2s_reg i2s register address
	* @param dir Clock direction
	*
	* Return: int value 0 for success, -1 in case of error
	*/
	static int i2s_set_sysclk_dir(struct i2s_reg *i2s_reg, int dir)
	{
	unsigned int mod = readl(&i2s_reg->mod);

	if (dir == SND_SOC_CLOCK_IN)
	mod \|= MOD_CDCLKCON;
	else
	mod &= ~MOD_CDCLKCON;

	writel(mod, &i2s_reg->mod);

	return 0;
	}

	/*
	* Sets I2S Clcok format
	*
	* @param fmt i2s clock properties
	* @param i2s_reg i2s register address
	*
	* Return: int value 0 for success, -1 in case of error
	*/
	static int i2s_set_fmt(struct i2s_reg *i2s_reg, unsigned int fmt)
	{
	unsigned int mod = readl(&i2s_reg->mod);
	unsigned int tmp = 0;
	unsigned int ret = 0;

	/* Format is priority */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
	tmp \|= MOD_LR_RLOW;
	tmp \|= MOD_SDF_MSB;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	tmp \|= MOD_LR_RLOW;
	tmp \|= MOD_SDF_LSB;
	break;
	case SND_SOC_DAIFMT_I2S:
	tmp \|= MOD_SDF_IIS;
	break;
	default:
	debug("%s: Invalid format priority [0x%x]\n", __func__,
	(fmt & SND_SOC_DAIFMT_FORMAT_MASK));
	return -ERANGE;
	}

	/*
	* INV flag is relative to the FORMAT flag - if set it simply
	* flips the polarity specified by the Standard
	*/
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	break;
	case SND_SOC_DAIFMT_NB_IF:
	if (tmp & MOD_LR_RLOW)
	tmp &= ~MOD_LR_RLOW;
	else
	tmp \|= MOD_LR_RLOW;
	break;
	default:
	debug("%s: Invalid clock ploarity input [0x%x]\n", __func__,
	(fmt & SND_SOC_DAIFMT_INV_MASK));
	return -ERANGE;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	tmp \|= MOD_SLAVE;
	break;
	case SND_SOC_DAIFMT_CBM_CFM:
	/* Set default source clock in Master mode */
	ret = i2s_set_sysclk_dir(i2s_reg, SND_SOC_CLOCK_OUT);
	if (ret != 0) {
	debug("%s:set i2s clock direction failed\n", __func__);
	return ret;
	}
	break;
	default:
	debug("%s: Invalid master selection [0x%x]\n", __func__,
	(fmt & SND_SOC_DAIFMT_MASTER_MASK));
	return -ERANGE;
	}

	mod &= ~(MOD_SDF_MASK \| MOD_LR_RLOW \| MOD_SLAVE);
	mod \|= tmp;
	writel(mod, &i2s_reg->mod);

	return 0;
	}

	/*
	* Sets the sample width in bits
	*
	* @param blc samplewidth (size of sample in bits)
	* @param i2s_reg i2s register address
	*
	* Return: int value 0 for success, -1 in case of error
	*/
	static int i2s_set_samplesize(struct i2s_reg *i2s_reg, unsigned int blc)
	{
	unsigned int mod = readl(&i2s_reg->mod);

	mod &= ~MOD_BLCP_MASK;
	mod &= ~MOD_BLC_MASK;

	switch (blc) {
	case 8:
	mod \|= MOD_BLCP_8BIT;
	mod \|= MOD_BLC_8BIT;
	break;
	case 16:
	mod \|= MOD_BLCP_16BIT;
	mod \|= MOD_BLC_16BIT;
	break;
	case 24:
	mod \|= MOD_BLCP_24BIT;
	mod \|= MOD_BLC_24BIT;
	break;
	default:
	debug("%s: Invalid sample size input [0x%x]\n",
	__func__, blc);
	return -ERANGE;
	}
	writel(mod, &i2s_reg->mod);

	return 0;
	}

	int i2s_transfer_tx_data(struct i2s_uc_priv pi2s_tx, void data,
	uint data_size)
	{
	struct i2s_reg i2s_reg = (struct i2s_reg )pi2s_tx->base_address;
	u32 *ptr;
	int i;
	int start;

	if (data_size < FIFO_LENGTH) {
	debug("%s : Invalid data size\n", __func__);
	return -ENODATA; /* invalid pcm data size */
	}

	/* fill the tx buffer before stating the tx transmit */
	for (i = 0, ptr = data; i < FIFO_LENGTH; i++)
	writel(*ptr++, &i2s_reg->txd);

	data_size -= sizeof(ptr) FIFO_LENGTH;
	i2s_txctrl(i2s_reg, I2S_TX_ON);

	while (data_size > 0) {
	start = get_timer(0);
	if (!(CON_TXFIFO_FULL & (readl(&i2s_reg->con)))) {
	writel(*ptr++, &i2s_reg->txd);
	data_size -= sizeof(*ptr);
	} else {
	if (get_timer(start) > TIMEOUT_I2S_TX) {
	i2s_txctrl(i2s_reg, I2S_TX_OFF);
	debug("%s: I2S Transfer Timeout\n", __func__);
	return -ETIMEDOUT;
	}
	}
	}
	i2s_txctrl(i2s_reg, I2S_TX_OFF);

	return 0;
	}

	static int i2s_tx_init(struct i2s_uc_priv *pi2s_tx)
	{
	int ret;
	struct i2s_reg i2s_reg = (struct i2s_reg )pi2s_tx->base_address;

	if (pi2s_tx->id == 0) {
	/* Initialize GPIO for I2S-0 */
	exynos_pinmux_config(PERIPH_ID_I2S0, 0);

	/* Set EPLL Clock */
	ret = set_epll_clk(pi2s_tx->samplingrate * pi2s_tx->rfs * 4);
	} else if (pi2s_tx->id == 1) {
	/* Initialize GPIO for I2S-1 */
	exynos_pinmux_config(PERIPH_ID_I2S1, 0);

	/* Set EPLL Clock */
	ret = set_epll_clk(pi2s_tx->audio_pll_clk);
	} else {
	debug("%s: unsupported i2s-%d bus\n", __func__, pi2s_tx->id);
	return -ERANGE;
	}

	if (ret) {
	debug("%s: epll clock set rate failed\n", __func__);
	return ret;
	}

	/* Select Clk Source for Audio 0 or 1 */
	ret = set_i2s_clk_source(pi2s_tx->id);
	if (ret) {
	debug("%s: unsupported clock for i2s-%d\n", __func__,
	pi2s_tx->id);
	return ret;
	}

	if (pi2s_tx->id == 0) {
	/Reset the i2s module /
	writel(CON_RESET, &i2s_reg->con);

	writel(MOD_OP_CLK \| MOD_RCLKSRC, &i2s_reg->mod);
	/* set i2s prescaler */
	writel(PSREN \| PSVAL, &i2s_reg->psr);
	} else {
	/* Set Prescaler to get MCLK */
	ret = set_i2s_clk_prescaler(pi2s_tx->audio_pll_clk,
	(pi2s_tx->samplingrate * (pi2s_tx->rfs)),
	pi2s_tx->id);
	}
	if (ret) {
	debug("%s: unsupported prescalar for i2s-%d\n", __func__,
	pi2s_tx->id);
	return ret;
	}

	/* Configure I2s format */
	ret = i2s_set_fmt(i2s_reg, SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_CBM_CFM);
	if (ret == 0) {
	i2s_set_lr_framesize(i2s_reg, pi2s_tx->rfs);
	ret = i2s_set_samplesize(i2s_reg, pi2s_tx->bitspersample);
	if (ret != 0) {
	debug("%s:set sample rate failed\n", __func__);
	return ret;
	}

	i2s_set_bitclk_framesize(i2s_reg, pi2s_tx->bfs);
	/* disable i2s transfer flag and flush the fifo */
	i2s_txctrl(i2s_reg, I2S_TX_OFF);
	i2s_fifo(i2s_reg, FIC_TXFLUSH);
	} else {
	debug("%s: failed\n", __func__);
	}

	return ret;
	}

	static int samsung_i2s_tx_data(struct udevice dev, void data, uint data_size)
	{
	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);

	return i2s_transfer_tx_data(priv, data, data_size);
	}

	static int samsung_i2s_probe(struct udevice *dev)
	{
	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);

	return i2s_tx_init(priv);
	}

	static int samsung_i2s_of_to_plat(struct udevice *dev)
	{
	struct i2s_uc_priv *priv = dev_get_uclass_priv(dev);
	ulong base;

	/*
	* Get the pre-defined sound specific values from FDT.
	* All of these are expected to be correct otherwise
	* wrong register values in i2s setup parameters
	* may result in no sound play.
	*/
	base = dev_read_addr(dev);
	if (base == FDT_ADDR_T_NONE) {
	debug("%s: Missing i2s base\n", __func__);
	return -EINVAL;
	}
	priv->base_address = base;

	if (dev_read_u32u(dev, "samsung,i2s-epll-clock-frequency",
	&priv->audio_pll_clk))
	goto err;
	debug("audio_pll_clk = %d\n", priv->audio_pll_clk);
	if (dev_read_u32u(dev, "samsung,i2s-sampling-rate",
	&priv->samplingrate))
	goto err;
	debug("samplingrate = %d\n", priv->samplingrate);
	if (dev_read_u32u(dev, "samsung,i2s-bits-per-sample",
	&priv->bitspersample))
	goto err;
	debug("bitspersample = %d\n", priv->bitspersample);
	if (dev_read_u32u(dev, "samsung,i2s-channels", &priv->channels))
	goto err;
	debug("channels = %d\n", priv->channels);
	if (dev_read_u32u(dev, "samsung,i2s-lr-clk-framesize", &priv->rfs))
	goto err;
	debug("rfs = %d\n", priv->rfs);
	if (dev_read_u32u(dev, "samsung,i2s-bit-clk-framesize", &priv->bfs))
	goto err;
	debug("bfs = %d\n", priv->bfs);

	if (dev_read_u32u(dev, "samsung,i2s-id", &priv->id))
	goto err;
	debug("id = %d\n", priv->id);

	return 0;

	err:
	debug("fail to get sound i2s node properties\n");

	return -EINVAL;
	}

	static const struct i2s_ops samsung_i2s_ops = {
	.tx_data = samsung_i2s_tx_data,
	};

	static const struct udevice_id samsung_i2s_ids[] = {
	{ .compatible = "samsung,s5pv210-i2s" },
	{ }
	};

	U_BOOT_DRIVER(samsung_i2s) = {
	.name = "samsung_i2s",
	.id = UCLASS_I2S,
	.of_match = samsung_i2s_ids,
	.probe = samsung_i2s_probe,
	.of_to_plat = samsung_i2s_of_to_plat,
	.ops = &samsung_i2s_ops,
	};