ASoC: mxs: add mxs-saif driver

Signed-off-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/mxs/mxs-saif.c

+/*
+ * Copyright 2011 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <mach/dma.h>
+#include <asm/mach-types.h>
+#include <mach/hardware.h>
+#include <mach/mxs.h>
+
+#include "mxs-saif.h"
+
+static struct mxs_saif *mxs_saif[2];
+
+static int mxs_saif_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
+			int clk_id, unsigned int freq, int dir)
+{
+	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+	switch (clk_id) {
+	case MXS_SAIF_MCLK:
+		saif->mclk = freq;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * Set SAIF clock and MCLK
+ */
+static int mxs_saif_set_clk(struct mxs_saif *saif,
+				  unsigned int mclk,
+				  unsigned int rate)
+{
+	u32 scr;
+	int ret;
+
+	scr = __raw_readl(saif->base + SAIF_CTRL);
+	scr &= ~BM_SAIF_CTRL_BITCLK_MULT_RATE;
+	scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+
+	/*
+	 * Set SAIF clock
+	 *
+	 * The SAIF clock should be either 384*fs or 512*fs.
+	 * If MCLK is used, the SAIF clk ratio need to match mclk ratio.
+	 *  For 32x mclk, set saif clk as 512*fs.
+	 *  For 48x mclk, set saif clk as 384*fs.
+	 *
+	 * If MCLK is not used, we just set saif clk to 512*fs.
+	 */
+	if (saif->mclk_in_use) {
+		if (mclk % 32 == 0) {
+			scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+			ret = clk_set_rate(saif->clk, 512 * rate);
+		} else if (mclk % 48 == 0) {
+			scr |= BM_SAIF_CTRL_BITCLK_BASE_RATE;
+			ret = clk_set_rate(saif->clk, 384 * rate);
+		} else {
+			/* SAIF MCLK should be either 32x or 48x */
+			return -EINVAL;
+		}
+	} else {
+		ret = clk_set_rate(saif->clk, 512 * rate);
+		scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+	}
+
+	if (ret)
+		return ret;
+
+	if (!saif->mclk_in_use) {
+		__raw_writel(scr, saif->base + SAIF_CTRL);
+		return 0;
+	}
+
+	/*
+	 * Program the over-sample rate for MCLK output
+	 *
+	 * The available MCLK range is 32x, 48x... 512x. The rate
+	 * could be from 8kHz to 192kH.
+	 */
+	switch (mclk / rate) {
+	case 32:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(4);
+		break;
+	case 64:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3);
+		break;
+	case 128:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2);
+		break;
+	case 256:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1);
+		break;
+	case 512:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0);
+		break;
+	case 48:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3);
+		break;
+	case 96:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2);
+		break;
+	case 192:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1);
+		break;
+	case 384:
+		scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	__raw_writel(scr, saif->base + SAIF_CTRL);
+
+	return 0;
+}
+
+/*
+ * Put and disable MCLK.
+ */
+int mxs_saif_put_mclk(unsigned int saif_id)
+{
+	struct mxs_saif *saif = mxs_saif[saif_id];
+	u32 stat;
+
+	if (!saif)
+		return -EINVAL;
+
+	stat = __raw_readl(saif->base + SAIF_STAT);
+	if (stat & BM_SAIF_STAT_BUSY) {
+		dev_err(saif->dev, "error: busy\n");
+		return -EBUSY;
+	}
+
+	clk_disable(saif->clk);
+
+	/* disable MCLK output */
+	__raw_writel(BM_SAIF_CTRL_CLKGATE,
+		saif->base + SAIF_CTRL + MXS_SET_ADDR);
+	__raw_writel(BM_SAIF_CTRL_RUN,
+		saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+	saif->mclk_in_use = 0;
+	return 0;
+}
+
+/*
+ * Get MCLK and set clock rate, then enable it
+ *
+ * This interface is used for codecs who are using MCLK provided
+ * by saif.
+ */
+int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk,
+					unsigned int rate)
+{
+	struct mxs_saif *saif = mxs_saif[saif_id];
+	u32 stat;
+	int ret;
+
+	if (!saif)
+		return -EINVAL;
+
+	stat = __raw_readl(saif->base + SAIF_STAT);
+	if (stat & BM_SAIF_STAT_BUSY) {
+		dev_err(saif->dev, "error: busy\n");
+		return -EBUSY;
+	}
+
+	/* Clear Reset */
+	__raw_writel(BM_SAIF_CTRL_SFTRST,
+		saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+	saif->mclk_in_use = 1;
+	ret = mxs_saif_set_clk(saif, mclk, rate);
+	if (ret)
+		return ret;
+
+	ret = clk_enable(saif->clk);
+	if (ret)
+		return ret;
+
+	/* enable MCLK output */
+	__raw_writel(BM_SAIF_CTRL_CLKGATE,
+		saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+	__raw_writel(BM_SAIF_CTRL_RUN,
+		saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+	return 0;
+}
+
+/*
+ * SAIF DAI format configuration.
+ * Should only be called when port is inactive.
+ */
+static int mxs_saif_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
+{
+	u32 scr, stat;
+	u32 scr0;
+	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+	stat = __raw_readl(saif->base + SAIF_STAT);
+	if (stat & BM_SAIF_STAT_BUSY) {
+		dev_err(cpu_dai->dev, "error: busy\n");
+		return -EBUSY;
+	}
+
+	scr0 = __raw_readl(saif->base + SAIF_CTRL);
+	scr0 = scr0 & ~BM_SAIF_CTRL_BITCLK_EDGE & ~BM_SAIF_CTRL_LRCLK_POLARITY \
+		& ~BM_SAIF_CTRL_JUSTIFY & ~BM_SAIF_CTRL_DELAY;
+	scr = 0;
+
+	/* DAI mode */
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		/* data frame low 1clk before data */
+		scr |= BM_SAIF_CTRL_DELAY;
+		scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		/* data frame high with data */
+		scr &= ~BM_SAIF_CTRL_DELAY;
+		scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+		scr &= ~BM_SAIF_CTRL_JUSTIFY;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* DAI clock inversion */
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_IB_IF:
+		scr |= BM_SAIF_CTRL_BITCLK_EDGE;
+		scr |= BM_SAIF_CTRL_LRCLK_POLARITY;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		scr |= BM_SAIF_CTRL_BITCLK_EDGE;
+		scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		scr &= ~BM_SAIF_CTRL_BITCLK_EDGE;
+		scr |= BM_SAIF_CTRL_LRCLK_POLARITY;
+		break;
+	case SND_SOC_DAIFMT_NB_NF:
+		scr &= ~BM_SAIF_CTRL_BITCLK_EDGE;
+		scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+		break;
+	}
+
+	/*
+	 * Note: We simply just support master mode since SAIF TX can only
+	 * work as master.
+	 */
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		scr &= ~BM_SAIF_CTRL_SLAVE_MODE;
+		__raw_writel(scr | scr0, saif->base + SAIF_CTRL);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int mxs_saif_startup(struct snd_pcm_substream *substream,
+			   struct snd_soc_dai *cpu_dai)
+{
+	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+	snd_soc_dai_set_dma_data(cpu_dai, substream, &saif->dma_param);
+
+	/* clear error status to 0 for each re-open */
+	saif->fifo_underrun = 0;
+	saif->fifo_overrun = 0;
+
+	/* Clear Reset for normal operations */
+	__raw_writel(BM_SAIF_CTRL_SFTRST,
+		saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+	return 0;
+}
+
+/*
+ * Should only be called when port is inactive.
+ * although can be called multiple times by upper layers.
+ */
+static int mxs_saif_hw_params(struct snd_pcm_substream *substream,
+			     struct snd_pcm_hw_params *params,
+			     struct snd_soc_dai *cpu_dai)
+{
+	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+	u32 scr, stat;
+	int ret;
+
+	/* mclk should already be set */
+	if (!saif->mclk && saif->mclk_in_use) {
+		dev_err(cpu_dai->dev, "set mclk first\n");
+		return -EINVAL;
+	}
+
+	stat = __raw_readl(saif->base + SAIF_STAT);
+	if (stat & BM_SAIF_STAT_BUSY) {
+		dev_err(cpu_dai->dev, "error: busy\n");
+		return -EBUSY;
+	}
+
+	/*
+	 * Set saif clk based on sample rate.
+	 * If mclk is used, we also set mclk, if not, saif->mclk is
+	 * default 0, means not used.
+	 */
+	ret = mxs_saif_set_clk(saif, saif->mclk, params_rate(params));
+	if (ret) {
+		dev_err(cpu_dai->dev, "unable to get proper clk\n");
+		return ret;
+	}
+
+	scr = __raw_readl(saif->base + SAIF_CTRL);
+
+	scr &= ~BM_SAIF_CTRL_WORD_LENGTH;
+	scr &= ~BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		scr |= BF_SAIF_CTRL_WORD_LENGTH(0);
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		scr |= BF_SAIF_CTRL_WORD_LENGTH(4);
+		scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		scr |= BF_SAIF_CTRL_WORD_LENGTH(8);
+		scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Tx/Rx config */
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		/* enable TX mode */
+		scr &= ~BM_SAIF_CTRL_READ_MODE;
+	} else {
+		/* enable RX mode */
+		scr |= BM_SAIF_CTRL_READ_MODE;
+	}
+
+	__raw_writel(scr, saif->base + SAIF_CTRL);
+	return 0;
+}
+
+static int mxs_saif_prepare(struct snd_pcm_substream *substream,
+			   struct snd_soc_dai *cpu_dai)
+{
+	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+	/* clear clock gate */
+	__raw_writel(BM_SAIF_CTRL_CLKGATE,
+		saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+	/* enable FIFO error irqs */
+	__raw_writel(BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN,
+		saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+	return 0;
+}
+
+static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
+				struct snd_soc_dai *cpu_dai)
+{
+	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		dev_dbg(cpu_dai->dev, "start\n");
+
+		clk_enable(saif->clk);
+		if (!saif->mclk_in_use)
+			__raw_writel(BM_SAIF_CTRL_RUN,
+				saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			/*
+			 * write a data to saif data register to trigger
+			 * the transfer
+			 */
+			__raw_writel(0, saif->base + SAIF_DATA);
+		} else {
+			/*
+			 * read a data from saif data register to trigger
+			 * the receive
+			 */
+			__raw_readl(saif->base + SAIF_DATA);
+		}
+
+		dev_dbg(cpu_dai->dev, "CTRL 0x%x STAT 0x%x\n",
+			__raw_readl(saif->base + SAIF_CTRL),
+			__raw_readl(saif->base + SAIF_STAT));
+
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		dev_dbg(cpu_dai->dev, "stop\n");
+
+		clk_disable(saif->clk);
+		if (!saif->mclk_in_use)
+			__raw_writel(BM_SAIF_CTRL_RUN,
+				saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#define MXS_SAIF_RATES		SNDRV_PCM_RATE_8000_192000
+#define MXS_SAIF_FORMATS \
+	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+	SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_ops mxs_saif_dai_ops = {
+	.startup = mxs_saif_startup,
+	.trigger = mxs_saif_trigger,
+	.prepare = mxs_saif_prepare,
+	.hw_params = mxs_saif_hw_params,
+	.set_sysclk = mxs_saif_set_dai_sysclk,
+	.set_fmt = mxs_saif_set_dai_fmt,
+};
+
+static int mxs_saif_dai_probe(struct snd_soc_dai *dai)
+{
+	struct mxs_saif *saif = dev_get_drvdata(dai->dev);
+
+	snd_soc_dai_set_drvdata(dai, saif);
+
+	return 0;
+}
+
+static struct snd_soc_dai_driver mxs_saif_dai = {
+	.name = "mxs-saif",
+	.probe = mxs_saif_dai_probe,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = MXS_SAIF_RATES,
+		.formats = MXS_SAIF_FORMATS,
+	},
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = MXS_SAIF_RATES,
+		.formats = MXS_SAIF_FORMATS,
+	},
+	.ops = &mxs_saif_dai_ops,
+};
+
+static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
+{
+	struct mxs_saif *saif = dev_id;
+	unsigned int stat;
+
+	stat = __raw_readl(saif->base + SAIF_STAT);
+	if (!(stat & (BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ |
+			BM_SAIF_STAT_FIFO_OVERFLOW_IRQ)))
+		return IRQ_NONE;
+
+	if (stat & BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ) {
+		dev_dbg(saif->dev, "underrun!!! %d\n", ++saif->fifo_underrun);
+		__raw_writel(BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ,
+				saif->base + SAIF_STAT + MXS_CLR_ADDR);
+	}
+
+	if (stat & BM_SAIF_STAT_FIFO_OVERFLOW_IRQ) {
+		dev_dbg(saif->dev, "overrun!!! %d\n", ++saif->fifo_overrun);
+		__raw_writel(BM_SAIF_STAT_FIFO_OVERFLOW_IRQ,
+				saif->base + SAIF_STAT + MXS_CLR_ADDR);
+	}
+
+	dev_dbg(saif->dev, "SAIF_CTRL %x SAIF_STAT %x\n",
+	       __raw_readl(saif->base + SAIF_CTRL),
+	       __raw_readl(saif->base + SAIF_STAT));
+
+	return IRQ_HANDLED;
+}
+
+static int mxs_saif_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct mxs_saif *saif;
+	int ret = 0;
+
+	saif = kzalloc(sizeof(*saif), GFP_KERNEL);
+	if (!saif)
+		return -ENOMEM;
+
+	if (pdev->id >= ARRAY_SIZE(mxs_saif))
+		return -EINVAL;
+	mxs_saif[pdev->id] = saif;
+
+	saif->clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(saif->clk)) {
+		ret = PTR_ERR(saif->clk);
+		dev_err(&pdev->dev, "Cannot get the clock: %d\n",
+			ret);
+		goto failed_clk;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -ENODEV;
+		dev_err(&pdev->dev, "failed to get io resource: %d\n",
+			ret);
+		goto failed_get_resource;
+	}
+
+	if (!request_mem_region(res->start, resource_size(res), "mxs-saif")) {
+		dev_err(&pdev->dev, "request_mem_region failed\n");
+		ret = -EBUSY;
+		goto failed_get_resource;
+	}
+
+	saif->base = ioremap(res->start, resource_size(res));
+	if (!saif->base) {
+		dev_err(&pdev->dev, "ioremap failed\n");
+		ret = -ENODEV;
+		goto failed_ioremap;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!res) {
+		ret = -ENODEV;
+		dev_err(&pdev->dev, "failed to get dma resource: %d\n",
+			ret);
+		goto failed_ioremap;
+	}
+	saif->dma_param.chan_num = res->start;
+
+	saif->irq = platform_get_irq(pdev, 0);
+	if (saif->irq < 0) {
+		ret = saif->irq;
+		dev_err(&pdev->dev, "failed to get irq resource: %d\n",
+			ret);
+		goto failed_get_irq1;
+	}
+
+	saif->dev = &pdev->dev;
+	ret = request_irq(saif->irq, mxs_saif_irq, 0, "mxs-saif", saif);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request irq\n");
+		goto failed_get_irq1;
+	}
+
+	saif->dma_param.chan_irq = platform_get_irq(pdev, 1);
+	if (saif->dma_param.chan_irq < 0) {
+		ret = saif->dma_param.chan_irq;
+		dev_err(&pdev->dev, "failed to get dma irq resource: %d\n",
+			ret);
+		goto failed_get_irq2;
+	}
+
+	platform_set_drvdata(pdev, saif);
+
+	ret = snd_soc_register_dai(&pdev->dev, &mxs_saif_dai);
+	if (ret) {
+		dev_err(&pdev->dev, "register DAI failed\n");
+		goto failed_register;
+	}
+
+	saif->soc_platform_pdev = platform_device_alloc(
+					"mxs-pcm-audio", pdev->id);
+	if (!saif->soc_platform_pdev) {
+		ret = -ENOMEM;
+		goto failed_pdev_alloc;
+	}
+
+	platform_set_drvdata(saif->soc_platform_pdev, saif);
+	ret = platform_device_add(saif->soc_platform_pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to add soc platform device\n");
+		goto failed_pdev_add;
+	}
+
+	return 0;
+
+failed_pdev_add:
+	platform_device_put(saif->soc_platform_pdev);
+failed_pdev_alloc:
+	snd_soc_unregister_dai(&pdev->dev);
+failed_register:
+failed_get_irq2:
+	free_irq(saif->irq, saif);
+failed_get_irq1:
+	iounmap(saif->base);
+failed_ioremap:
+	release_mem_region(res->start, resource_size(res));
+failed_get_resource:
+	clk_put(saif->clk);
+failed_clk:
+	kfree(saif);
+
+	return ret;
+}
+
+static int __devexit mxs_saif_remove(struct platform_device *pdev)
+{
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct mxs_saif *saif = platform_get_drvdata(pdev);
+
+	platform_device_unregister(saif->soc_platform_pdev);
+
+	snd_soc_unregister_dai(&pdev->dev);
+
+	iounmap(saif->base);
+	release_mem_region(res->start, resource_size(res));
+	free_irq(saif->irq, saif);
+
+	clk_put(saif->clk);
+	kfree(saif);
+
+	return 0;
+}
+
+static struct platform_driver mxs_saif_driver = {
+	.probe = mxs_saif_probe,
+	.remove = __devexit_p(mxs_saif_remove),
+
+	.driver = {
+		.name = "mxs-saif",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init mxs_saif_init(void)
+{
+	return platform_driver_register(&mxs_saif_driver);
+}
+
+static void __exit mxs_saif_exit(void)
+{
+	platform_driver_unregister(&mxs_saif_driver);
+}
+
+module_init(mxs_saif_init);
+module_exit(mxs_saif_exit);
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MXS ASoC SAIF driver");
+MODULE_LICENSE("GPL");

sound/soc/mxs/mxs-saif.h

+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+
+#ifndef _MXS_SAIF_H
+#define _MXS_SAIF_H
+
+#define SAIF_CTRL	0x0
+#define SAIF_STAT	0x10
+#define SAIF_DATA	0x20
+#define SAIF_VERSION	0X30
+
+/* SAIF_CTRL */
+#define BM_SAIF_CTRL_SFTRST		0x80000000
+#define BM_SAIF_CTRL_CLKGATE		0x40000000
+#define BP_SAIF_CTRL_BITCLK_MULT_RATE	27
+#define BM_SAIF_CTRL_BITCLK_MULT_RATE	0x38000000
+#define BF_SAIF_CTRL_BITCLK_MULT_RATE(v) \
+		(((v) << 27) & BM_SAIF_CTRL_BITCLK_MULT_RATE)
+#define BM_SAIF_CTRL_BITCLK_BASE_RATE	0x04000000
+#define BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN	0x02000000
+#define BM_SAIF_CTRL_FIFO_SERVICE_IRQ_EN	0x01000000
+#define BP_SAIF_CTRL_RSRVD2		21
+#define BM_SAIF_CTRL_RSRVD2		0x00E00000
+
+#define BP_SAIF_CTRL_DMAWAIT_COUNT	16
+#define BM_SAIF_CTRL_DMAWAIT_COUNT	0x001F0000
+#define BF_SAIF_CTRL_DMAWAIT_COUNT(v) \
+		(((v) << 16) & BM_SAIF_CTRL_DMAWAIT_COUNT)
+#define BP_SAIF_CTRL_CHANNEL_NUM_SELECT 14
+#define BM_SAIF_CTRL_CHANNEL_NUM_SELECT 0x0000C000
+#define BF_SAIF_CTRL_CHANNEL_NUM_SELECT(v) \
+		(((v) << 14) & BM_SAIF_CTRL_CHANNEL_NUM_SELECT)
+#define BM_SAIF_CTRL_LRCLK_PULSE	0x00002000
+#define BM_SAIF_CTRL_BIT_ORDER		0x00001000
+#define BM_SAIF_CTRL_DELAY		0x00000800
+#define BM_SAIF_CTRL_JUSTIFY		0x00000400
+#define BM_SAIF_CTRL_LRCLK_POLARITY	0x00000200
+#define BM_SAIF_CTRL_BITCLK_EDGE	0x00000100
+#define BP_SAIF_CTRL_WORD_LENGTH	4
+#define BM_SAIF_CTRL_WORD_LENGTH	0x000000F0
+#define BF_SAIF_CTRL_WORD_LENGTH(v) \
+		(((v) << 4) & BM_SAIF_CTRL_WORD_LENGTH)
+#define BM_SAIF_CTRL_BITCLK_48XFS_ENABLE	0x00000008
+#define BM_SAIF_CTRL_SLAVE_MODE		0x00000004
+#define BM_SAIF_CTRL_READ_MODE		0x00000002
+#define BM_SAIF_CTRL_RUN		0x00000001
+
+/* SAIF_STAT */
+#define BM_SAIF_STAT_PRESENT		0x80000000
+#define BP_SAIF_STAT_RSRVD2		17
+#define BM_SAIF_STAT_RSRVD2		0x7FFE0000
+#define BF_SAIF_STAT_RSRVD2(v) \
+		(((v) << 17) & BM_SAIF_STAT_RSRVD2)
+#define BM_SAIF_STAT_DMA_PREQ		0x00010000
+#define BP_SAIF_STAT_RSRVD1		7
+#define BM_SAIF_STAT_RSRVD1		0x0000FF80
+#define BF_SAIF_STAT_RSRVD1(v) \
+		(((v) << 7) & BM_SAIF_STAT_RSRVD1)
+
+#define BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ 0x00000040
+#define BM_SAIF_STAT_FIFO_OVERFLOW_IRQ	0x00000020
+#define BM_SAIF_STAT_FIFO_SERVICE_IRQ	0x00000010
+#define BP_SAIF_STAT_RSRVD0		1
+#define BM_SAIF_STAT_RSRVD0		0x0000000E
+#define BF_SAIF_STAT_RSRVD0(v) \
+		(((v) << 1) & BM_SAIF_STAT_RSRVD0)
+#define BM_SAIF_STAT_BUSY		0x00000001
+
+/* SAFI_DATA */
+#define BP_SAIF_DATA_PCM_RIGHT		16
+#define BM_SAIF_DATA_PCM_RIGHT		0xFFFF0000
+#define BF_SAIF_DATA_PCM_RIGHT(v) \
+		(((v) << 16) & BM_SAIF_DATA_PCM_RIGHT)
+#define BP_SAIF_DATA_PCM_LEFT		0
+#define BM_SAIF_DATA_PCM_LEFT		0x0000FFFF
+#define BF_SAIF_DATA_PCM_LEFT(v)	\
+		(((v) << 0) & BM_SAIF_DATA_PCM_LEFT)
+
+/* SAIF_VERSION */
+#define BP_SAIF_VERSION_MAJOR		24
+#define BM_SAIF_VERSION_MAJOR		0xFF000000
+#define BF_SAIF_VERSION_MAJOR(v) \
+		(((v) << 24) & BM_SAIF_VERSION_MAJOR)
+#define BP_SAIF_VERSION_MINOR		16
+#define BM_SAIF_VERSION_MINOR		0x00FF0000
+#define BF_SAIF_VERSION_MINOR(v) \
+		(((v) << 16) & BM_SAIF_VERSION_MINOR)
+#define BP_SAIF_VERSION_STEP		0
+#define BM_SAIF_VERSION_STEP		0x0000FFFF
+#define BF_SAIF_VERSION_STEP(v) \
+		(((v) << 0) & BM_SAIF_VERSION_STEP)
+
+#define MXS_SAIF_MCLK		0
+
+#include "mxs-pcm.h"
+
+struct mxs_saif {
+	struct device *dev;
+	struct clk *clk;
+	unsigned int mclk;
+	unsigned int mclk_in_use;
+	void __iomem *base;
+	int irq;
+	struct mxs_pcm_dma_params dma_param;
+
+	struct platform_device *soc_platform_pdev;
+	u32 fifo_underrun;
+	u32 fifo_overrun;
+};
+
+extern int mxs_saif_put_mclk(unsigned int saif_id);
+extern int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk,
+					unsigned int rate);
+#endif