sound/soc/fsl/fsl_sai.c - kernel/msm-4.19 - Gitiles

 /*
  * Freescale ALSA SoC Digital Audio Interface (SAI) driver.
  *
  * Copyright 2012-2013 Freescale Semiconductor, Inc.
  *
  * This program is free software, you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
  * Free Software Foundation, either version 2 of the License, or(at your
  * option) any later version.
  *
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dmaengine.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>

 #include "fsl_sai.h"
 #include "imx-pcm.h"

 #define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE |\
 		       FSL_SAI_CSR_FEIE)

 static irqreturn_t fsl_sai_isr(int irq, void *devid)
 {
 	struct fsl_sai *sai = (struct fsl_sai *)devid;
 	struct device *dev = &sai->pdev->dev;
 	u32 flags, xcsr, mask;
 	bool irq_none = true;

 	/*
 	 * Both IRQ status bits and IRQ mask bits are in the xCSR but
 	 * different shifts. And we here create a mask only for those
 	 * IRQs that we activated.
 	 */
 	mask = (FSL_SAI_FLAGS >> FSL_SAI_CSR_xIE_SHIFT) << FSL_SAI_CSR_xF_SHIFT;

 	/* Tx IRQ */
 	regmap_read(sai->regmap, FSL_SAI_TCSR, &xcsr);
 	flags = xcsr & mask;

 	if (flags)
 		irq_none = false;
 	else
 		goto irq_rx;

 	if (flags & FSL_SAI_CSR_WSF)
 		dev_dbg(dev, "isr: Start of Tx word detected\n");

 	if (flags & FSL_SAI_CSR_SEF)
 		dev_warn(dev, "isr: Tx Frame sync error detected\n");

 	if (flags & FSL_SAI_CSR_FEF) {
 		dev_warn(dev, "isr: Transmit underrun detected\n");
 		/* FIFO reset for safety */
 		xcsr |= FSL_SAI_CSR_FR;
 	}

 	if (flags & FSL_SAI_CSR_FWF)
 		dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");

 	if (flags & FSL_SAI_CSR_FRF)
 		dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n");

 	flags &= FSL_SAI_CSR_xF_W_MASK;
 	xcsr &= ~FSL_SAI_CSR_xF_MASK;

 	if (flags)
 		regmap_write(sai->regmap, FSL_SAI_TCSR, flags | xcsr);

 irq_rx:
 	/* Rx IRQ */
 	regmap_read(sai->regmap, FSL_SAI_RCSR, &xcsr);
 	flags = xcsr & mask;

 	if (flags)
 		irq_none = false;
 	else
 		goto out;

 	if (flags & FSL_SAI_CSR_WSF)
 		dev_dbg(dev, "isr: Start of Rx word detected\n");

 	if (flags & FSL_SAI_CSR_SEF)
 		dev_warn(dev, "isr: Rx Frame sync error detected\n");

 	if (flags & FSL_SAI_CSR_FEF) {
 		dev_warn(dev, "isr: Receive overflow detected\n");
 		/* FIFO reset for safety */
 		xcsr |= FSL_SAI_CSR_FR;
 	}

 	if (flags & FSL_SAI_CSR_FWF)
 		dev_dbg(dev, "isr: Enabled receive FIFO is full\n");

 	if (flags & FSL_SAI_CSR_FRF)
 		dev_dbg(dev, "isr: Receive FIFO watermark has been reached\n");

 	flags &= FSL_SAI_CSR_xF_W_MASK;
 	xcsr &= ~FSL_SAI_CSR_xF_MASK;

 	if (flags)
 		regmap_write(sai->regmap, FSL_SAI_RCSR, flags | xcsr);

 out:
 	if (irq_none)
 		return IRQ_NONE;
 	else
 		return IRQ_HANDLED;
 }

 static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
 		int clk_id, unsigned int freq, int fsl_dir)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
 	u32 val_cr2 = 0;

 	switch (clk_id) {
 	case FSL_SAI_CLK_BUS:
 		val_cr2 |= FSL_SAI_CR2_MSEL_BUS;
 		break;
 	case FSL_SAI_CLK_MAST1:
 		val_cr2 |= FSL_SAI_CR2_MSEL_MCLK1;
 		break;
 	case FSL_SAI_CLK_MAST2:
 		val_cr2 |= FSL_SAI_CR2_MSEL_MCLK2;
 		break;
 	case FSL_SAI_CLK_MAST3:
 		val_cr2 |= FSL_SAI_CR2_MSEL_MCLK3;
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
 			   FSL_SAI_CR2_MSEL_MASK, val_cr2);

 	return 0;
 }

 static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 		int clk_id, unsigned int freq, int dir)
 {
 	int ret;

 	if (dir == SND_SOC_CLOCK_IN)
 		return 0;

 	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
 					FSL_FMT_TRANSMITTER);
 	if (ret) {
 		dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
 		return ret;
 	}

 	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
 					FSL_FMT_RECEIVER);
 	if (ret)
 		dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);

 	return ret;
 }

 static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
 				unsigned int fmt, int fsl_dir)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
 	u32 val_cr2 = 0, val_cr4 = 0;

 	if (!sai->is_lsb_first)
 		val_cr4 |= FSL_SAI_CR4_MF;

 	/* DAI mode */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		/*
 		 * Frame low, 1clk before data, one word length for frame sync,
 		 * frame sync starts one serial clock cycle earlier,
 		 * that is, together with the last bit of the previous
 		 * data word.
 		 */
 		val_cr2 |= FSL_SAI_CR2_BCP;
 		val_cr4 |= FSL_SAI_CR4_FSE | FSL_SAI_CR4_FSP;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		/*
 		 * Frame high, one word length for frame sync,
 		 * frame sync asserts with the first bit of the frame.
 		 */
 		val_cr2 |= FSL_SAI_CR2_BCP;
 		break;
 	case SND_SOC_DAIFMT_DSP_A:
 		/*
 		 * Frame high, 1clk before data, one bit for frame sync,
 		 * frame sync starts one serial clock cycle earlier,
 		 * that is, together with the last bit of the previous
 		 * data word.
 		 */
 		val_cr2 |= FSL_SAI_CR2_BCP;
 		val_cr4 |= FSL_SAI_CR4_FSE;
 		sai->is_dsp_mode = true;
 		break;
 	case SND_SOC_DAIFMT_DSP_B:
 		/*
 		 * Frame high, one bit for frame sync,
 		 * frame sync asserts with the first bit of the frame.
 		 */
 		val_cr2 |= FSL_SAI_CR2_BCP;
 		sai->is_dsp_mode = true;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		/* To be done */
 	default:
 		return -EINVAL;
 	}

 	/* DAI clock inversion */
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_IB_IF:
 		/* Invert both clocks */
 		val_cr2 ^= FSL_SAI_CR2_BCP;
 		val_cr4 ^= FSL_SAI_CR4_FSP;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		/* Invert bit clock */
 		val_cr2 ^= FSL_SAI_CR2_BCP;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		/* Invert frame clock */
 		val_cr4 ^= FSL_SAI_CR4_FSP;
 		break;
 	case SND_SOC_DAIFMT_NB_NF:
 		/* Nothing to do for both normal cases */
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* DAI clock master masks */
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
 		val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		break;
 	case SND_SOC_DAIFMT_CBS_CFM:
 		val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFS:
 		val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
 			   FSL_SAI_CR2_BCP | FSL_SAI_CR2_BCD_MSTR, val_cr2);
 	regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
 			   FSL_SAI_CR4_MF | FSL_SAI_CR4_FSE |
 			   FSL_SAI_CR4_FSP | FSL_SAI_CR4_FSD_MSTR, val_cr4);

 	return 0;
 }

 static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 {
 	int ret;

 	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
 	if (ret) {
 		dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
 		return ret;
 	}

 	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
 	if (ret)
 		dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);

 	return ret;
 }

 static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
 		struct snd_pcm_hw_params *params,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	unsigned int channels = params_channels(params);
 	u32 word_width = snd_pcm_format_width(params_format(params));
 	u32 val_cr4 = 0, val_cr5 = 0;

 	if (!sai->is_dsp_mode)
 		val_cr4 |= FSL_SAI_CR4_SYWD(word_width);

 	val_cr5 |= FSL_SAI_CR5_WNW(word_width);
 	val_cr5 |= FSL_SAI_CR5_W0W(word_width);

 	if (sai->is_lsb_first)
 		val_cr5 |= FSL_SAI_CR5_FBT(0);
 	else
 		val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);

 	val_cr4 |= FSL_SAI_CR4_FRSZ(channels);

 	regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
 			   FSL_SAI_CR4_SYWD_MASK | FSL_SAI_CR4_FRSZ_MASK,
 			   val_cr4);
 	regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx),
 			   FSL_SAI_CR5_WNW_MASK | FSL_SAI_CR5_W0W_MASK |
 			   FSL_SAI_CR5_FBT_MASK, val_cr5);
 	regmap_write(sai->regmap, FSL_SAI_xMR(tx), ~0UL - ((1 << channels) - 1));

 	return 0;
 }

 static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	u32 xcsr, count = 100;

 	/*
 	 * Asynchronous mode: Clear SYNC for both Tx and Rx.
 	 * Rx sync with Tx clocks: Clear SYNC for Tx, set it for Rx.
 	 * Tx sync with Rx clocks: Clear SYNC for Rx, set it for Tx.
 	 */
 	regmap_update_bits(sai->regmap, FSL_SAI_TCR2, FSL_SAI_CR2_SYNC, 0);
 	regmap_update_bits(sai->regmap, FSL_SAI_RCR2, FSL_SAI_CR2_SYNC,
 			   sai->synchronous[RX] ? FSL_SAI_CR2_SYNC : 0);

 	/*
 	 * It is recommended that the transmitter is the last enabled
 	 * and the first disabled.
 	 */
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
 				   FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);

 		regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
 				   FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
 		regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
 				   FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);

 		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
 				   FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
 				   FSL_SAI_CSR_FRDE, 0);
 		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
 				   FSL_SAI_CSR_xIE_MASK, 0);

 		/* Check if the opposite FRDE is also disabled */
 		regmap_read(sai->regmap, FSL_SAI_xCSR(!tx), &xcsr);
 		if (!(xcsr & FSL_SAI_CSR_FRDE)) {
 			/* Disable both directions and reset their FIFOs */
 			regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
 					   FSL_SAI_CSR_TERE, 0);
 			regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
 					   FSL_SAI_CSR_TERE, 0);

 			/* TERE will remain set till the end of current frame */
 			do {
 				udelay(10);
 				regmap_read(sai->regmap, FSL_SAI_xCSR(tx), &xcsr);
 			} while (--count && xcsr & FSL_SAI_CSR_TERE);

 			regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
 					   FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
 			regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
 					   FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
 		}
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int fsl_sai_startup(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	struct device *dev = &sai->pdev->dev;
 	int ret;

 	ret = clk_prepare_enable(sai->bus_clk);
 	if (ret) {
 		dev_err(dev, "failed to enable bus clock: %d\n", ret);
 		return ret;
 	}

 	regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
 			   FSL_SAI_CR3_TRCE);

 	return 0;
 }

 static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;

 	regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE, 0);

 	clk_disable_unprepare(sai->bus_clk);
 }

 static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
 	.set_sysclk	= fsl_sai_set_dai_sysclk,
 	.set_fmt	= fsl_sai_set_dai_fmt,
 	.hw_params	= fsl_sai_hw_params,
 	.trigger	= fsl_sai_trigger,
 	.startup	= fsl_sai_startup,
 	.shutdown	= fsl_sai_shutdown,
 };

 static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);

 	/* Software Reset for both Tx and Rx */
 	regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
 	regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
 	/* Clear SR bit to finish the reset */
 	regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
 	regmap_write(sai->regmap, FSL_SAI_RCSR, 0);

 	regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK,
 			   FSL_SAI_MAXBURST_TX * 2);
 	regmap_update_bits(sai->regmap, FSL_SAI_RCR1, FSL_SAI_CR1_RFW_MASK,
 			   FSL_SAI_MAXBURST_RX - 1);

 	snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
 				&sai->dma_params_rx);

 	snd_soc_dai_set_drvdata(cpu_dai, sai);

 	return 0;
 }

 static struct snd_soc_dai_driver fsl_sai_dai = {
 	.probe = fsl_sai_dai_probe,
 	.playback = {
 		.stream_name = "CPU-Playback",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_96000,
 		.formats = FSL_SAI_FORMATS,
 	},
 	.capture = {
 		.stream_name = "CPU-Capture",
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_96000,
 		.formats = FSL_SAI_FORMATS,
 	},
 	.ops = &fsl_sai_pcm_dai_ops,
 };

 static const struct snd_soc_component_driver fsl_component = {
 	.name           = "fsl-sai",
 };

 static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case FSL_SAI_TCSR:
 	case FSL_SAI_TCR1:
 	case FSL_SAI_TCR2:
 	case FSL_SAI_TCR3:
 	case FSL_SAI_TCR4:
 	case FSL_SAI_TCR5:
 	case FSL_SAI_TFR:
 	case FSL_SAI_TMR:
 	case FSL_SAI_RCSR:
 	case FSL_SAI_RCR1:
 	case FSL_SAI_RCR2:
 	case FSL_SAI_RCR3:
 	case FSL_SAI_RCR4:
 	case FSL_SAI_RCR5:
 	case FSL_SAI_RDR:
 	case FSL_SAI_RFR:
 	case FSL_SAI_RMR:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case FSL_SAI_TFR:
 	case FSL_SAI_RFR:
 	case FSL_SAI_TDR:
 	case FSL_SAI_RDR:
 		return true;
 	default:
 		return false;
 	}

 }

 static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case FSL_SAI_TCSR:
 	case FSL_SAI_TCR1:
 	case FSL_SAI_TCR2:
 	case FSL_SAI_TCR3:
 	case FSL_SAI_TCR4:
 	case FSL_SAI_TCR5:
 	case FSL_SAI_TDR:
 	case FSL_SAI_TMR:
 	case FSL_SAI_RCSR:
 	case FSL_SAI_RCR1:
 	case FSL_SAI_RCR2:
 	case FSL_SAI_RCR3:
 	case FSL_SAI_RCR4:
 	case FSL_SAI_RCR5:
 	case FSL_SAI_RMR:
 		return true;
 	default:
 		return false;
 	}
 }

 static const struct regmap_config fsl_sai_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,

 	.max_register = FSL_SAI_RMR,
 	.readable_reg = fsl_sai_readable_reg,
 	.volatile_reg = fsl_sai_volatile_reg,
 	.writeable_reg = fsl_sai_writeable_reg,
 };

 static int fsl_sai_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct fsl_sai *sai;
 	struct resource *res;
 	void __iomem *base;
 	char tmp[8];
 	int irq, ret, i;

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

 	sai->pdev = pdev;

 	if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai"))
 		sai->sai_on_imx = true;

 	sai->is_lsb_first = of_property_read_bool(np, "lsb-first");

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

 	sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
 			"bus", base, &fsl_sai_regmap_config);

 	/* Compatible with old DTB cases */
 	if (IS_ERR(sai->regmap))
 		sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
 				"sai", base, &fsl_sai_regmap_config);
 	if (IS_ERR(sai->regmap)) {
 		dev_err(&pdev->dev, "regmap init failed\n");
 		return PTR_ERR(sai->regmap);
 	}

 	/* No error out for old DTB cases but only mark the clock NULL */
 	sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
 	if (IS_ERR(sai->bus_clk)) {
 		dev_err(&pdev->dev, "failed to get bus clock: %ld\n",
 				PTR_ERR(sai->bus_clk));
 		sai->bus_clk = NULL;
 	}

 	for (i = 0; i < FSL_SAI_MCLK_MAX; i++) {
 		sprintf(tmp, "mclk%d", i + 1);
 		sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
 		if (IS_ERR(sai->mclk_clk[i])) {
 			dev_err(&pdev->dev, "failed to get mclk%d clock: %ld\n",
 					i + 1, PTR_ERR(sai->mclk_clk[i]));
 			sai->mclk_clk[i] = NULL;
 		}
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
 		return irq;
 	}

 	ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, 0, np->name, sai);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
 		return ret;
 	}

 	/* Sync Tx with Rx as default by following old DT binding */
 	sai->synchronous[RX] = true;
 	sai->synchronous[TX] = false;
 	fsl_sai_dai.symmetric_rates = 1;
 	fsl_sai_dai.symmetric_channels = 1;
 	fsl_sai_dai.symmetric_samplebits = 1;

 	if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) &&
 	    of_find_property(np, "fsl,sai-asynchronous", NULL)) {
 		/* error out if both synchronous and asynchronous are present */
 		dev_err(&pdev->dev, "invalid binding for synchronous mode\n");
 		return -EINVAL;
 	}

 	if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) {
 		/* Sync Rx with Tx */
 		sai->synchronous[RX] = false;
 		sai->synchronous[TX] = true;
 	} else if (of_find_property(np, "fsl,sai-asynchronous", NULL)) {
 		/* Discard all settings for asynchronous mode */
 		sai->synchronous[RX] = false;
 		sai->synchronous[TX] = false;
 		fsl_sai_dai.symmetric_rates = 0;
 		fsl_sai_dai.symmetric_channels = 0;
 		fsl_sai_dai.symmetric_samplebits = 0;
 	}

 	sai->dma_params_rx.addr = res->start + FSL_SAI_RDR;
 	sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
 	sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
 	sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;

 	platform_set_drvdata(pdev, sai);

 	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
 			&fsl_sai_dai, 1);
 	if (ret)
 		return ret;

 	if (sai->sai_on_imx)
 		return imx_pcm_dma_init(pdev);
 	else
 		return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
 				SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
 }

 static const struct of_device_id fsl_sai_ids[] = {
 	{ .compatible = "fsl,vf610-sai", },
 	{ .compatible = "fsl,imx6sx-sai", },
 	{ /* sentinel */ }
 };

 static struct platform_driver fsl_sai_driver = {
 	.probe = fsl_sai_probe,
 	.driver = {
 		.name = "fsl-sai",
 		.of_match_table = fsl_sai_ids,
 	},
 };
 module_platform_driver(fsl_sai_driver);

 MODULE_DESCRIPTION("Freescale Soc SAI Interface");
 MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
 MODULE_ALIAS("platform:fsl-sai");
 MODULE_LICENSE("GPL");
	/*
	* Freescale ALSA SoC Digital Audio Interface (SAI) driver.
	*
	* Copyright 2012-2013 Freescale Semiconductor, Inc.
	*
	* This program is free software, you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation, either version 2 of the License, or(at your
	* option) any later version.
	*
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/dmaengine.h>
	#include <linux/module.h>
	#include <linux/of_address.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/dmaengine_pcm.h>
	#include <sound/pcm_params.h>

	#include "fsl_sai.h"
	#include "imx-pcm.h"

	#define FSL_SAI_FLAGS (FSL_SAI_CSR_SEIE \|\
	FSL_SAI_CSR_FEIE)

	static irqreturn_t fsl_sai_isr(int irq, void *devid)
	{
	struct fsl_sai sai = (struct fsl_sai )devid;
	struct device *dev = &sai->pdev->dev;
	u32 flags, xcsr, mask;
	bool irq_none = true;

	/*
	* Both IRQ status bits and IRQ mask bits are in the xCSR but
	* different shifts. And we here create a mask only for those
	* IRQs that we activated.
	*/
	mask = (FSL_SAI_FLAGS >> FSL_SAI_CSR_xIE_SHIFT) << FSL_SAI_CSR_xF_SHIFT;

	/* Tx IRQ */
	regmap_read(sai->regmap, FSL_SAI_TCSR, &xcsr);
	flags = xcsr & mask;

	if (flags)
	irq_none = false;
	else
	goto irq_rx;

	if (flags & FSL_SAI_CSR_WSF)
	dev_dbg(dev, "isr: Start of Tx word detected\n");

	if (flags & FSL_SAI_CSR_SEF)
	dev_warn(dev, "isr: Tx Frame sync error detected\n");

	if (flags & FSL_SAI_CSR_FEF) {
	dev_warn(dev, "isr: Transmit underrun detected\n");
	/* FIFO reset for safety */
	xcsr \|= FSL_SAI_CSR_FR;
	}

	if (flags & FSL_SAI_CSR_FWF)
	dev_dbg(dev, "isr: Enabled transmit FIFO is empty\n");

	if (flags & FSL_SAI_CSR_FRF)
	dev_dbg(dev, "isr: Transmit FIFO watermark has been reached\n");

	flags &= FSL_SAI_CSR_xF_W_MASK;
	xcsr &= ~FSL_SAI_CSR_xF_MASK;

	if (flags)
	regmap_write(sai->regmap, FSL_SAI_TCSR, flags \| xcsr);

	irq_rx:
	/* Rx IRQ */
	regmap_read(sai->regmap, FSL_SAI_RCSR, &xcsr);
	flags = xcsr & mask;

	if (flags)
	irq_none = false;
	else
	goto out;

	if (flags & FSL_SAI_CSR_WSF)
	dev_dbg(dev, "isr: Start of Rx word detected\n");

	if (flags & FSL_SAI_CSR_SEF)
	dev_warn(dev, "isr: Rx Frame sync error detected\n");

	if (flags & FSL_SAI_CSR_FEF) {
	dev_warn(dev, "isr: Receive overflow detected\n");
	/* FIFO reset for safety */
	xcsr \|= FSL_SAI_CSR_FR;
	}

	if (flags & FSL_SAI_CSR_FWF)
	dev_dbg(dev, "isr: Enabled receive FIFO is full\n");

	if (flags & FSL_SAI_CSR_FRF)
	dev_dbg(dev, "isr: Receive FIFO watermark has been reached\n");

	flags &= FSL_SAI_CSR_xF_W_MASK;
	xcsr &= ~FSL_SAI_CSR_xF_MASK;

	if (flags)
	regmap_write(sai->regmap, FSL_SAI_RCSR, flags \| xcsr);

	out:
	if (irq_none)
	return IRQ_NONE;
	else
	return IRQ_HANDLED;
	}

	static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq, int fsl_dir)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
	u32 val_cr2 = 0;

	switch (clk_id) {
	case FSL_SAI_CLK_BUS:
	val_cr2 \|= FSL_SAI_CR2_MSEL_BUS;
	break;
	case FSL_SAI_CLK_MAST1:
	val_cr2 \|= FSL_SAI_CR2_MSEL_MCLK1;
	break;
	case FSL_SAI_CLK_MAST2:
	val_cr2 \|= FSL_SAI_CR2_MSEL_MCLK2;
	break;
	case FSL_SAI_CLK_MAST3:
	val_cr2 \|= FSL_SAI_CR2_MSEL_MCLK3;
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
	FSL_SAI_CR2_MSEL_MASK, val_cr2);

	return 0;
	}

	static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq, int dir)
	{
	int ret;

	if (dir == SND_SOC_CLOCK_IN)
	return 0;

	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
	FSL_FMT_TRANSMITTER);
	if (ret) {
	dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
	return ret;
	}

	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
	FSL_FMT_RECEIVER);
	if (ret)
	dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);

	return ret;
	}

	static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
	unsigned int fmt, int fsl_dir)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	bool tx = fsl_dir == FSL_FMT_TRANSMITTER;
	u32 val_cr2 = 0, val_cr4 = 0;

	if (!sai->is_lsb_first)
	val_cr4 \|= FSL_SAI_CR4_MF;

	/* DAI mode */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	/*
	* Frame low, 1clk before data, one word length for frame sync,
	* frame sync starts one serial clock cycle earlier,
	* that is, together with the last bit of the previous
	* data word.
	*/
	val_cr2 \|= FSL_SAI_CR2_BCP;
	val_cr4 \|= FSL_SAI_CR4_FSE \| FSL_SAI_CR4_FSP;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	/*
	* Frame high, one word length for frame sync,
	* frame sync asserts with the first bit of the frame.
	*/
	val_cr2 \|= FSL_SAI_CR2_BCP;
	break;
	case SND_SOC_DAIFMT_DSP_A:
	/*
	* Frame high, 1clk before data, one bit for frame sync,
	* frame sync starts one serial clock cycle earlier,
	* that is, together with the last bit of the previous
	* data word.
	*/
	val_cr2 \|= FSL_SAI_CR2_BCP;
	val_cr4 \|= FSL_SAI_CR4_FSE;
	sai->is_dsp_mode = true;
	break;
	case SND_SOC_DAIFMT_DSP_B:
	/*
	* Frame high, one bit for frame sync,
	* frame sync asserts with the first bit of the frame.
	*/
	val_cr2 \|= FSL_SAI_CR2_BCP;
	sai->is_dsp_mode = true;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	/* To be done */
	default:
	return -EINVAL;
	}

	/* DAI clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
	/* Invert both clocks */
	val_cr2 ^= FSL_SAI_CR2_BCP;
	val_cr4 ^= FSL_SAI_CR4_FSP;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	/* Invert bit clock */
	val_cr2 ^= FSL_SAI_CR2_BCP;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	/* Invert frame clock */
	val_cr4 ^= FSL_SAI_CR4_FSP;
	break;
	case SND_SOC_DAIFMT_NB_NF:
	/* Nothing to do for both normal cases */
	break;
	default:
	return -EINVAL;
	}

	/* DAI clock master masks */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	val_cr2 \|= FSL_SAI_CR2_BCD_MSTR;
	val_cr4 \|= FSL_SAI_CR4_FSD_MSTR;
	break;
	case SND_SOC_DAIFMT_CBM_CFM:
	break;
	case SND_SOC_DAIFMT_CBS_CFM:
	val_cr2 \|= FSL_SAI_CR2_BCD_MSTR;
	break;
	case SND_SOC_DAIFMT_CBM_CFS:
	val_cr4 \|= FSL_SAI_CR4_FSD_MSTR;
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(sai->regmap, FSL_SAI_xCR2(tx),
	FSL_SAI_CR2_BCP \| FSL_SAI_CR2_BCD_MSTR, val_cr2);
	regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
	FSL_SAI_CR4_MF \| FSL_SAI_CR4_FSE \|
	FSL_SAI_CR4_FSP \| FSL_SAI_CR4_FSD_MSTR, val_cr4);

	return 0;
	}

	static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
	{
	int ret;

	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
	if (ret) {
	dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
	return ret;
	}

	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
	if (ret)
	dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);

	return ret;
	}

	static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	unsigned int channels = params_channels(params);
	u32 word_width = snd_pcm_format_width(params_format(params));
	u32 val_cr4 = 0, val_cr5 = 0;

	if (!sai->is_dsp_mode)
	val_cr4 \|= FSL_SAI_CR4_SYWD(word_width);

	val_cr5 \|= FSL_SAI_CR5_WNW(word_width);
	val_cr5 \|= FSL_SAI_CR5_W0W(word_width);

	if (sai->is_lsb_first)
	val_cr5 \|= FSL_SAI_CR5_FBT(0);
	else
	val_cr5 \|= FSL_SAI_CR5_FBT(word_width - 1);

	val_cr4 \|= FSL_SAI_CR4_FRSZ(channels);

	regmap_update_bits(sai->regmap, FSL_SAI_xCR4(tx),
	FSL_SAI_CR4_SYWD_MASK \| FSL_SAI_CR4_FRSZ_MASK,
	val_cr4);
	regmap_update_bits(sai->regmap, FSL_SAI_xCR5(tx),
	FSL_SAI_CR5_WNW_MASK \| FSL_SAI_CR5_W0W_MASK \|
	FSL_SAI_CR5_FBT_MASK, val_cr5);
	regmap_write(sai->regmap, FSL_SAI_xMR(tx), ~0UL - ((1 << channels) - 1));

	return 0;
	}

	static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	u32 xcsr, count = 100;

	/*
	* Asynchronous mode: Clear SYNC for both Tx and Rx.
	* Rx sync with Tx clocks: Clear SYNC for Tx, set it for Rx.
	* Tx sync with Rx clocks: Clear SYNC for Rx, set it for Tx.
	*/
	regmap_update_bits(sai->regmap, FSL_SAI_TCR2, FSL_SAI_CR2_SYNC, 0);
	regmap_update_bits(sai->regmap, FSL_SAI_RCR2, FSL_SAI_CR2_SYNC,
	sai->synchronous[RX] ? FSL_SAI_CR2_SYNC : 0);

	/*
	* It is recommended that the transmitter is the last enabled
	* and the first disabled.
	*/
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
	FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);

	regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
	FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);
	regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
	FSL_SAI_CSR_TERE, FSL_SAI_CSR_TERE);

	regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
	FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
	FSL_SAI_CSR_FRDE, 0);
	regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
	FSL_SAI_CSR_xIE_MASK, 0);

	/* Check if the opposite FRDE is also disabled */
	regmap_read(sai->regmap, FSL_SAI_xCSR(!tx), &xcsr);
	if (!(xcsr & FSL_SAI_CSR_FRDE)) {
	/* Disable both directions and reset their FIFOs */
	regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
	FSL_SAI_CSR_TERE, 0);
	regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
	FSL_SAI_CSR_TERE, 0);

	/* TERE will remain set till the end of current frame */
	do {
	udelay(10);
	regmap_read(sai->regmap, FSL_SAI_xCSR(tx), &xcsr);
	} while (--count && xcsr & FSL_SAI_CSR_TERE);

	regmap_update_bits(sai->regmap, FSL_SAI_TCSR,
	FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
	regmap_update_bits(sai->regmap, FSL_SAI_RCSR,
	FSL_SAI_CSR_FR, FSL_SAI_CSR_FR);
	}
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int fsl_sai_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	struct device *dev = &sai->pdev->dev;
	int ret;

	ret = clk_prepare_enable(sai->bus_clk);
	if (ret) {
	dev_err(dev, "failed to enable bus clock: %d\n", ret);
	return ret;
	}

	regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE,
	FSL_SAI_CR3_TRCE);

	return 0;
	}

	static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;

	regmap_update_bits(sai->regmap, FSL_SAI_xCR3(tx), FSL_SAI_CR3_TRCE, 0);

	clk_disable_unprepare(sai->bus_clk);
	}

	static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
	.set_sysclk = fsl_sai_set_dai_sysclk,
	.set_fmt = fsl_sai_set_dai_fmt,
	.hw_params = fsl_sai_hw_params,
	.trigger = fsl_sai_trigger,
	.startup = fsl_sai_startup,
	.shutdown = fsl_sai_shutdown,
	};

	static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);

	/* Software Reset for both Tx and Rx */
	regmap_write(sai->regmap, FSL_SAI_TCSR, FSL_SAI_CSR_SR);
	regmap_write(sai->regmap, FSL_SAI_RCSR, FSL_SAI_CSR_SR);
	/* Clear SR bit to finish the reset */
	regmap_write(sai->regmap, FSL_SAI_TCSR, 0);
	regmap_write(sai->regmap, FSL_SAI_RCSR, 0);

	regmap_update_bits(sai->regmap, FSL_SAI_TCR1, FSL_SAI_CR1_RFW_MASK,
	FSL_SAI_MAXBURST_TX * 2);
	regmap_update_bits(sai->regmap, FSL_SAI_RCR1, FSL_SAI_CR1_RFW_MASK,
	FSL_SAI_MAXBURST_RX - 1);

	snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
	&sai->dma_params_rx);

	snd_soc_dai_set_drvdata(cpu_dai, sai);

	return 0;
	}

	static struct snd_soc_dai_driver fsl_sai_dai = {
	.probe = fsl_sai_dai_probe,
	.playback = {
	.stream_name = "CPU-Playback",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_96000,
	.formats = FSL_SAI_FORMATS,
	},
	.capture = {
	.stream_name = "CPU-Capture",
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_96000,
	.formats = FSL_SAI_FORMATS,
	},
	.ops = &fsl_sai_pcm_dai_ops,
	};

	static const struct snd_soc_component_driver fsl_component = {
	.name = "fsl-sai",
	};

	static bool fsl_sai_readable_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case FSL_SAI_TCSR:
	case FSL_SAI_TCR1:
	case FSL_SAI_TCR2:
	case FSL_SAI_TCR3:
	case FSL_SAI_TCR4:
	case FSL_SAI_TCR5:
	case FSL_SAI_TFR:
	case FSL_SAI_TMR:
	case FSL_SAI_RCSR:
	case FSL_SAI_RCR1:
	case FSL_SAI_RCR2:
	case FSL_SAI_RCR3:
	case FSL_SAI_RCR4:
	case FSL_SAI_RCR5:
	case FSL_SAI_RDR:
	case FSL_SAI_RFR:
	case FSL_SAI_RMR:
	return true;
	default:
	return false;
	}
	}

	static bool fsl_sai_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case FSL_SAI_TFR:
	case FSL_SAI_RFR:
	case FSL_SAI_TDR:
	case FSL_SAI_RDR:
	return true;
	default:
	return false;
	}

	}

	static bool fsl_sai_writeable_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case FSL_SAI_TCSR:
	case FSL_SAI_TCR1:
	case FSL_SAI_TCR2:
	case FSL_SAI_TCR3:
	case FSL_SAI_TCR4:
	case FSL_SAI_TCR5:
	case FSL_SAI_TDR:
	case FSL_SAI_TMR:
	case FSL_SAI_RCSR:
	case FSL_SAI_RCR1:
	case FSL_SAI_RCR2:
	case FSL_SAI_RCR3:
	case FSL_SAI_RCR4:
	case FSL_SAI_RCR5:
	case FSL_SAI_RMR:
	return true;
	default:
	return false;
	}
	}

	static const struct regmap_config fsl_sai_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,

	.max_register = FSL_SAI_RMR,
	.readable_reg = fsl_sai_readable_reg,
	.volatile_reg = fsl_sai_volatile_reg,
	.writeable_reg = fsl_sai_writeable_reg,
	};

	static int fsl_sai_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct fsl_sai *sai;
	struct resource *res;
	void __iomem *base;
	char tmp[8];
	int irq, ret, i;

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

	sai->pdev = pdev;

	if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai"))
	sai->sai_on_imx = true;

	sai->is_lsb_first = of_property_read_bool(np, "lsb-first");

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

	sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
	"bus", base, &fsl_sai_regmap_config);

	/* Compatible with old DTB cases */
	if (IS_ERR(sai->regmap))
	sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
	"sai", base, &fsl_sai_regmap_config);
	if (IS_ERR(sai->regmap)) {
	dev_err(&pdev->dev, "regmap init failed\n");
	return PTR_ERR(sai->regmap);
	}

	/* No error out for old DTB cases but only mark the clock NULL */
	sai->bus_clk = devm_clk_get(&pdev->dev, "bus");
	if (IS_ERR(sai->bus_clk)) {
	dev_err(&pdev->dev, "failed to get bus clock: %ld\n",
	PTR_ERR(sai->bus_clk));
	sai->bus_clk = NULL;
	}

	for (i = 0; i < FSL_SAI_MCLK_MAX; i++) {
	sprintf(tmp, "mclk%d", i + 1);
	sai->mclk_clk[i] = devm_clk_get(&pdev->dev, tmp);
	if (IS_ERR(sai->mclk_clk[i])) {
	dev_err(&pdev->dev, "failed to get mclk%d clock: %ld\n",
	i + 1, PTR_ERR(sai->mclk_clk[i]));
	sai->mclk_clk[i] = NULL;
	}
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
	return irq;
	}

	ret = devm_request_irq(&pdev->dev, irq, fsl_sai_isr, 0, np->name, sai);
	if (ret) {
	dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
	return ret;
	}

	/* Sync Tx with Rx as default by following old DT binding */
	sai->synchronous[RX] = true;
	sai->synchronous[TX] = false;
	fsl_sai_dai.symmetric_rates = 1;
	fsl_sai_dai.symmetric_channels = 1;
	fsl_sai_dai.symmetric_samplebits = 1;

	if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) &&
	of_find_property(np, "fsl,sai-asynchronous", NULL)) {
	/* error out if both synchronous and asynchronous are present */
	dev_err(&pdev->dev, "invalid binding for synchronous mode\n");
	return -EINVAL;
	}

	if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) {
	/* Sync Rx with Tx */
	sai->synchronous[RX] = false;
	sai->synchronous[TX] = true;
	} else if (of_find_property(np, "fsl,sai-asynchronous", NULL)) {
	/* Discard all settings for asynchronous mode */
	sai->synchronous[RX] = false;
	sai->synchronous[TX] = false;
	fsl_sai_dai.symmetric_rates = 0;
	fsl_sai_dai.symmetric_channels = 0;
	fsl_sai_dai.symmetric_samplebits = 0;
	}

	sai->dma_params_rx.addr = res->start + FSL_SAI_RDR;
	sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
	sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
	sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;

	platform_set_drvdata(pdev, sai);

	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
	&fsl_sai_dai, 1);
	if (ret)
	return ret;

	if (sai->sai_on_imx)
	return imx_pcm_dma_init(pdev);
	else
	return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
	SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
	}

	static const struct of_device_id fsl_sai_ids[] = {
	{ .compatible = "fsl,vf610-sai", },
	{ .compatible = "fsl,imx6sx-sai", },
	{ /* sentinel */ }
	};

	static struct platform_driver fsl_sai_driver = {
	.probe = fsl_sai_probe,
	.driver = {
	.name = "fsl-sai",
	.of_match_table = fsl_sai_ids,
	},
	};
	module_platform_driver(fsl_sai_driver);

	MODULE_DESCRIPTION("Freescale Soc SAI Interface");
	MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
	MODULE_ALIAS("platform:fsl-sai");
	MODULE_LICENSE("GPL");