Fixed MTP to work with TWRP

sound/soc/mxs/Kconfig

@@ -0,0 +1,21 @@
+menuconfig SND_MXS_SOC
+	tristate "SoC Audio for Freescale MXS CPUs"
+	depends on ARCH_MXS || COMPILE_TEST
+	depends on COMMON_CLK
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  Say Y or M if you want to add support for codecs attached to
+	  the MXS SAIF interface.
+
+
+if SND_MXS_SOC
+
+config SND_SOC_MXS_SGTL5000
+	tristate "SoC Audio support for MXS boards with sgtl5000"
+	depends on I2C
+	select SND_SOC_SGTL5000
+	help
+	  Say Y if you want to add support for SoC audio on an MXS board with
+	  a sgtl5000 codec.
+
+endif	# SND_MXS_SOC

sound/soc/mxs/Makefile

@@ -0,0 +1,10 @@
+# MXS Platform Support
+snd-soc-mxs-objs := mxs-saif.o
+snd-soc-mxs-pcm-objs := mxs-pcm.o
+
+obj-$(CONFIG_SND_MXS_SOC) += snd-soc-mxs.o snd-soc-mxs-pcm.o
+
+# i.MX Machine Support
+snd-soc-mxs-sgtl5000-objs := mxs-sgtl5000.o
+
+obj-$(CONFIG_SND_SOC_MXS_SGTL5000) += snd-soc-mxs-sgtl5000.o

sound/soc/mxs/mxs-pcm.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * Based on sound/soc/imx/imx-pcm-dma-mx2.c
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "mxs-pcm.h"
+
+static const struct snd_pcm_hardware snd_mxs_hardware = {
+	.info			= SNDRV_PCM_INFO_MMAP |
+				  SNDRV_PCM_INFO_MMAP_VALID |
+				  SNDRV_PCM_INFO_PAUSE |
+				  SNDRV_PCM_INFO_RESUME |
+				  SNDRV_PCM_INFO_INTERLEAVED |
+				  SNDRV_PCM_INFO_HALF_DUPLEX,
+	.period_bytes_min	= 32,
+	.period_bytes_max	= 8192,
+	.periods_min		= 1,
+	.periods_max		= 52,
+	.buffer_bytes_max	= 64 * 1024,
+	.fifo_size		= 32,
+};
+
+static const struct snd_dmaengine_pcm_config mxs_dmaengine_pcm_config = {
+	.pcm_hardware = &snd_mxs_hardware,
+	.prealloc_buffer_size = 64 * 1024,
+};
+
+int mxs_pcm_platform_register(struct device *dev)
+{
+	return devm_snd_dmaengine_pcm_register(dev, &mxs_dmaengine_pcm_config,
+		SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX);
+}
+EXPORT_SYMBOL_GPL(mxs_pcm_platform_register);
+
+MODULE_LICENSE("GPL");

sound/soc/mxs/mxs-pcm.h

@@ -0,0 +1,24 @@
+/*
+ * 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_PCM_H
+#define _MXS_PCM_H
+
+int mxs_pcm_platform_register(struct device *dev);
+
+#endif

sound/soc/mxs/mxs-saif.c

@@ -0,0 +1,828 @@
+/*
+ * 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/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "mxs-saif.h"
+
+#define MXS_SET_ADDR	0x4
+#define MXS_CLR_ADDR	0x8
+
+static struct mxs_saif *mxs_saif[2];
+
+/*
+ * SAIF is a little different with other normal SOC DAIs on clock using.
+ *
+ * For MXS, two SAIF modules are instantiated on-chip.
+ * Each SAIF has a set of clock pins and can be operating in master
+ * mode simultaneously if they are connected to different off-chip codecs.
+ * Also, one of the two SAIFs can master or drive the clock pins while the
+ * other SAIF, in slave mode, receives clocking from the master SAIF.
+ * This also means that both SAIFs must operate at the same sample rate.
+ *
+ * We abstract this as each saif has a master, the master could be
+ * itself or other saifs. In the generic saif driver, saif does not need
+ * to know the different clkmux. Saif only needs to know who is its master
+ * and operating its master to generate the proper clock rate for it.
+ * The master id is provided in mach-specific layer according to different
+ * clkmux setting.
+ */
+
+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;
+}
+
+/*
+ * Since SAIF may work on EXTMASTER mode, IOW, it's working BITCLK&LRCLK
+ * is provided by other SAIF, we provide a interface here to get its master
+ * from its master_id.
+ * Note that the master could be itself.
+ */
+static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif)
+{
+	return mxs_saif[saif->master_id];
+}
+
+/*
+ * 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;
+	struct mxs_saif *master_saif;
+
+	dev_dbg(saif->dev, "mclk %d rate %d\n", mclk, rate);
+
+	/* Set master saif to generate proper clock */
+	master_saif = mxs_saif_get_master(saif);
+	if (!master_saif)
+		return -EINVAL;
+
+	dev_dbg(saif->dev, "master saif%d\n", master_saif->id);
+
+	/* Checking if can playback and capture simutaneously */
+	if (master_saif->ongoing && rate != master_saif->cur_rate) {
+		dev_err(saif->dev,
+			"can not change clock, master saif%d(rate %d) is ongoing\n",
+			master_saif->id, master_saif->cur_rate);
+		return -EINVAL;
+	}
+
+	scr = __raw_readl(master_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.
+	 */
+	clk_prepare_enable(master_saif->clk);
+
+	if (master_saif->mclk_in_use) {
+		if (mclk % 32 == 0) {
+			scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+			ret = clk_set_rate(master_saif->clk, 512 * rate);
+		} else if (mclk % 48 == 0) {
+			scr |= BM_SAIF_CTRL_BITCLK_BASE_RATE;
+			ret = clk_set_rate(master_saif->clk, 384 * rate);
+		} else {
+			/* SAIF MCLK should be either 32x or 48x */
+			clk_disable_unprepare(master_saif->clk);
+			return -EINVAL;
+		}
+	} else {
+		ret = clk_set_rate(master_saif->clk, 512 * rate);
+		scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+	}
+
+	clk_disable_unprepare(master_saif->clk);
+
+	if (ret)
+		return ret;
+
+	master_saif->cur_rate = rate;
+
+	if (!master_saif->mclk_in_use) {
+		__raw_writel(scr, master_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, master_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_unprepare(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;
+}
+EXPORT_SYMBOL_GPL(mxs_saif_put_mclk);
+
+/*
+ * 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;
+	struct mxs_saif *master_saif;
+
+	if (!saif)
+		return -EINVAL;
+
+	/* Clear Reset */
+	__raw_writel(BM_SAIF_CTRL_SFTRST,
+		saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+	/* FIXME: need clear clk gate for register r/w */
+	__raw_writel(BM_SAIF_CTRL_CLKGATE,
+		saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+	master_saif = mxs_saif_get_master(saif);
+	if (saif != master_saif) {
+		dev_err(saif->dev, "can not get mclk from a non-master saif\n");
+		return -EINVAL;
+	}
+
+	stat = __raw_readl(saif->base + SAIF_STAT);
+	if (stat & BM_SAIF_STAT_BUSY) {
+		dev_err(saif->dev, "error: busy\n");
+		return -EBUSY;
+	}
+
+	saif->mclk_in_use = 1;
+	ret = mxs_saif_set_clk(saif, mclk, rate);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(saif->clk);
+	if (ret)
+		return ret;
+
+	/* enable MCLK output */
+	__raw_writel(BM_SAIF_CTRL_RUN,
+		saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mxs_saif_get_mclk);
+
+/*
+ * 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.
+	 * Here the master is relative to codec side.
+	 * Saif internally could be slave when working on EXTMASTER mode.
+	 * We just hide this to machine driver.
+	 */
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		if (saif->id == saif->master_id)
+			scr &= ~BM_SAIF_CTRL_SLAVE_MODE;
+		else
+			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);
+
+	/* 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);
+
+	/* clear clock gate */
+	__raw_writel(BM_SAIF_CTRL_CLKGATE,
+		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);
+	struct mxs_saif *master_saif;
+	u32 scr, stat;
+	int ret;
+
+	master_saif = mxs_saif_get_master(saif);
+	if (!master_saif)
+		return -EINVAL;
+
+	/* 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;
+	}
+
+	/* prepare clk in hw_param, enable in trigger */
+	clk_prepare(saif->clk);
+	if (saif != master_saif) {
+		/*
+		* Set an initial clock rate for the saif internal logic to work
+		* properly. This is important when working in EXTMASTER mode
+		* that uses the other saif's BITCLK&LRCLK but it still needs a
+		* basic clock which should be fast enough for the internal
+		* logic.
+		*/
+		clk_enable(saif->clk);
+		ret = clk_set_rate(saif->clk, 24000000);
+		clk_disable(saif->clk);
+		if (ret)
+			return ret;
+
+		clk_prepare(master_saif->clk);
+	}
+
+	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);
+
+	/* 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);
+	struct mxs_saif *master_saif;
+	u32 delay;
+	int ret;
+
+	master_saif = mxs_saif_get_master(saif);
+	if (!master_saif)
+		return -EINVAL;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (saif->state == MXS_SAIF_STATE_RUNNING)
+			return 0;
+
+		dev_dbg(cpu_dai->dev, "start\n");
+
+		ret = clk_enable(master_saif->clk);
+		if (ret) {
+			dev_err(saif->dev, "Failed to enable master clock\n");
+			return ret;
+		}
+
+		/*
+		 * If the saif's master is not itself, we also need to enable
+		 * itself clk for its internal basic logic to work.
+		 */
+		if (saif != master_saif) {
+			ret = clk_enable(saif->clk);
+			if (ret) {
+				dev_err(saif->dev, "Failed to enable master clock\n");
+				clk_disable(master_saif->clk);
+				return ret;
+			}
+
+			__raw_writel(BM_SAIF_CTRL_RUN,
+				saif->base + SAIF_CTRL + MXS_SET_ADDR);
+		}
+
+		if (!master_saif->mclk_in_use)
+			__raw_writel(BM_SAIF_CTRL_RUN,
+				master_saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			/*
+			 * write data to saif data register to trigger
+			 * the transfer.
+			 * For 24-bit format the 32-bit FIFO register stores
+			 * only one channel, so we need to write twice.
+			 * This is also safe for the other non 24-bit formats.
+			 */
+			__raw_writel(0, saif->base + SAIF_DATA);
+			__raw_writel(0, saif->base + SAIF_DATA);
+		} else {
+			/*
+			 * read data from saif data register to trigger
+			 * the receive.
+			 * For 24-bit format the 32-bit FIFO register stores
+			 * only one channel, so we need to read twice.
+			 * This is also safe for the other non 24-bit formats.
+			 */
+			__raw_readl(saif->base + SAIF_DATA);
+			__raw_readl(saif->base + SAIF_DATA);
+		}
+
+		master_saif->ongoing = 1;
+		saif->state = MXS_SAIF_STATE_RUNNING;
+
+		dev_dbg(saif->dev, "CTRL 0x%x STAT 0x%x\n",
+			__raw_readl(saif->base + SAIF_CTRL),
+			__raw_readl(saif->base + SAIF_STAT));
+
+		dev_dbg(master_saif->dev, "CTRL 0x%x STAT 0x%x\n",
+			__raw_readl(master_saif->base + SAIF_CTRL),
+			__raw_readl(master_saif->base + SAIF_STAT));
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (saif->state == MXS_SAIF_STATE_STOPPED)
+			return 0;
+
+		dev_dbg(cpu_dai->dev, "stop\n");
+
+		/* wait a while for the current sample to complete */
+		delay = USEC_PER_SEC / master_saif->cur_rate;
+
+		if (!master_saif->mclk_in_use) {
+			__raw_writel(BM_SAIF_CTRL_RUN,
+				master_saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+			udelay(delay);
+		}
+		clk_disable(master_saif->clk);
+
+		if (saif != master_saif) {
+			__raw_writel(BM_SAIF_CTRL_RUN,
+				saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+			udelay(delay);
+			clk_disable(saif->clk);
+		}
+
+		master_saif->ongoing = 0;
+		saif->state = MXS_SAIF_STATE_STOPPED;
+
+		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 const 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 const struct snd_soc_component_driver mxs_saif_component = {
+	.name		= "mxs-saif",
+};
+
+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_mclk_init(struct platform_device *pdev)
+{
+	struct mxs_saif *saif = platform_get_drvdata(pdev);
+	struct device_node *np = pdev->dev.of_node;
+	struct clk *clk;
+	int ret;
+
+	clk = clk_register_divider(&pdev->dev, "mxs_saif_mclk",
+				   __clk_get_name(saif->clk), 0,
+				   saif->base + SAIF_CTRL,
+				   BP_SAIF_CTRL_BITCLK_MULT_RATE, 3,
+				   0, NULL);
+	if (IS_ERR(clk)) {
+		ret = PTR_ERR(clk);
+		if (ret == -EEXIST)
+			return 0;
+		dev_err(&pdev->dev, "failed to register mclk: %d\n", ret);
+		return PTR_ERR(clk);
+	}
+
+	ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int mxs_saif_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *iores;
+	struct mxs_saif *saif;
+	int ret = 0;
+	struct device_node *master;
+
+	if (!np)
+		return -EINVAL;
+
+	saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL);
+	if (!saif)
+		return -ENOMEM;
+
+	ret = of_alias_get_id(np, "saif");
+	if (ret < 0)
+		return ret;
+	else
+		saif->id = ret;
+
+	/*
+	 * If there is no "fsl,saif-master" phandle, it's a saif
+	 * master.  Otherwise, it's a slave and its phandle points
+	 * to the master.
+	 */
+	master = of_parse_phandle(np, "fsl,saif-master", 0);
+	if (!master) {
+		saif->master_id = saif->id;
+	} else {
+		ret = of_alias_get_id(master, "saif");
+		if (ret < 0)
+			return ret;
+		else
+			saif->master_id = ret;
+	}
+
+	if (saif->master_id >= ARRAY_SIZE(mxs_saif)) {
+		dev_err(&pdev->dev, "get wrong master id\n");
+		return -EINVAL;
+	}
+
+	mxs_saif[saif->id] = saif;
+
+	saif->clk = devm_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);
+		return ret;
+	}
+
+	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	saif->base = devm_ioremap_resource(&pdev->dev, iores);
+	if (IS_ERR(saif->base))
+		return PTR_ERR(saif->base);
+
+	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);
+		return ret;
+	}
+
+	saif->dev = &pdev->dev;
+	ret = devm_request_irq(&pdev->dev, saif->irq, mxs_saif_irq, 0,
+			       "mxs-saif", saif);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to request irq\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, saif);
+
+	/* We only support saif0 being tx and clock master */
+	if (saif->id == 0) {
+		ret = mxs_saif_mclk_init(pdev);
+		if (ret)
+			dev_warn(&pdev->dev, "failed to init clocks\n");
+	}
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &mxs_saif_component,
+					      &mxs_saif_dai, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "register DAI failed\n");
+		return ret;
+	}
+
+	ret = mxs_pcm_platform_register(&pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id mxs_saif_dt_ids[] = {
+	{ .compatible = "fsl,imx28-saif", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_saif_dt_ids);
+
+static struct platform_driver mxs_saif_driver = {
+	.probe = mxs_saif_probe,
+
+	.driver = {
+		.name = "mxs-saif",
+		.owner = THIS_MODULE,
+		.of_match_table = mxs_saif_dt_ids,
+	},
+};
+
+module_platform_driver(mxs_saif_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MXS ASoC SAIF driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-saif");

sound/soc/mxs/mxs-saif.h

@@ -0,0 +1,137 @@
+/*
+ * 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;
+	unsigned int id;
+	unsigned int master_id;
+	unsigned int cur_rate;
+	unsigned int ongoing;
+
+	u32 fifo_underrun;
+	u32 fifo_overrun;
+
+	enum {
+		MXS_SAIF_STATE_STOPPED,
+		MXS_SAIF_STATE_RUNNING,
+	} state;
+};
+
+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

sound/soc/mxs/mxs-sgtl5000.c

@@ -0,0 +1,209 @@
+/*
+ * 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/device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+#include <sound/soc-dapm.h>
+
+#include "../codecs/sgtl5000.h"
+#include "mxs-saif.h"
+
+static int mxs_sgtl5000_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	unsigned int rate = params_rate(params);
+	u32 dai_format, mclk;
+	int ret;
+
+	/* sgtl5000 does not support 512*rate when in 96000 fs */
+	switch (rate) {
+	case 96000:
+		mclk = 256 * rate;
+		break;
+	default:
+		mclk = 512 * rate;
+		break;
+	}
+
+	/* Sgtl5000 sysclk should be >= 8MHz and <= 27M */
+	if (mclk < 8000000 || mclk > 27000000) {
+		dev_err(codec_dai->dev, "Invalid mclk frequency: %u.%03uMHz\n",
+			mclk / 1000000, mclk / 1000 % 1000);
+		return -EINVAL;
+	}
+
+	/* Set SGTL5000's SYSCLK (provided by SAIF MCLK) */
+	ret = snd_soc_dai_set_sysclk(codec_dai, SGTL5000_SYSCLK, mclk, 0);
+	if (ret) {
+		dev_err(codec_dai->dev, "Failed to set sysclk to %u.%03uMHz\n",
+			mclk / 1000000, mclk / 1000 % 1000);
+		return ret;
+	}
+
+	/* The SAIF MCLK should be the same as SGTL5000_SYSCLK */
+	ret = snd_soc_dai_set_sysclk(cpu_dai, MXS_SAIF_MCLK, mclk, 0);
+	if (ret) {
+		dev_err(cpu_dai->dev, "Failed to set sysclk to %u.%03uMHz\n",
+			mclk / 1000000, mclk / 1000 % 1000);
+		return ret;
+	}
+
+	/* set codec to slave mode */
+	dai_format = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+			SND_SOC_DAIFMT_CBS_CFS;
+
+	/* set codec DAI configuration */
+	ret = snd_soc_dai_set_fmt(codec_dai, dai_format);
+	if (ret) {
+		dev_err(codec_dai->dev, "Failed to set dai format to %08x\n",
+			dai_format);
+		return ret;
+	}
+
+	/* set cpu DAI configuration */
+	ret = snd_soc_dai_set_fmt(cpu_dai, dai_format);
+	if (ret) {
+		dev_err(cpu_dai->dev, "Failed to set dai format to %08x\n",
+			dai_format);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct snd_soc_ops mxs_sgtl5000_hifi_ops = {
+	.hw_params = mxs_sgtl5000_hw_params,
+};
+
+static struct snd_soc_dai_link mxs_sgtl5000_dai[] = {
+	{
+		.name		= "HiFi Tx",
+		.stream_name	= "HiFi Playback",
+		.codec_dai_name	= "sgtl5000",
+		.ops		= &mxs_sgtl5000_hifi_ops,
+		.playback_only	= true,
+	}, {
+		.name		= "HiFi Rx",
+		.stream_name	= "HiFi Capture",
+		.codec_dai_name	= "sgtl5000",
+		.ops		= &mxs_sgtl5000_hifi_ops,
+		.capture_only	= true,
+	},
+};
+
+static struct snd_soc_card mxs_sgtl5000 = {
+	.name		= "mxs_sgtl5000",
+	.owner		= THIS_MODULE,
+	.dai_link	= mxs_sgtl5000_dai,
+	.num_links	= ARRAY_SIZE(mxs_sgtl5000_dai),
+};
+
+static int mxs_sgtl5000_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = &mxs_sgtl5000;
+	int ret, i;
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *saif_np[2], *codec_np;
+
+	saif_np[0] = of_parse_phandle(np, "saif-controllers", 0);
+	saif_np[1] = of_parse_phandle(np, "saif-controllers", 1);
+	codec_np = of_parse_phandle(np, "audio-codec", 0);
+	if (!saif_np[0] || !saif_np[1] || !codec_np) {
+		dev_err(&pdev->dev, "phandle missing or invalid\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < 2; i++) {
+		mxs_sgtl5000_dai[i].codec_name = NULL;
+		mxs_sgtl5000_dai[i].codec_of_node = codec_np;
+		mxs_sgtl5000_dai[i].cpu_dai_name = NULL;
+		mxs_sgtl5000_dai[i].cpu_of_node = saif_np[i];
+		mxs_sgtl5000_dai[i].platform_name = NULL;
+		mxs_sgtl5000_dai[i].platform_of_node = saif_np[i];
+	}
+
+	of_node_put(codec_np);
+	of_node_put(saif_np[0]);
+	of_node_put(saif_np[1]);
+
+	/*
+	 * Set an init clock(11.28Mhz) for sgtl5000 initialization(i2c r/w).
+	 * The Sgtl5000 sysclk is derived from saif0 mclk and it's range
+	 * should be >= 8MHz and <= 27M.
+	 */
+	ret = mxs_saif_get_mclk(0, 44100 * 256, 44100);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to get mclk\n");
+		return ret;
+	}
+
+	card->dev = &pdev->dev;
+	platform_set_drvdata(pdev, card);
+
+	ret = snd_soc_register_card(card);
+	if (ret) {
+		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mxs_sgtl5000_remove(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+	mxs_saif_put_mclk(0);
+
+	snd_soc_unregister_card(card);
+
+	return 0;
+}
+
+static const struct of_device_id mxs_sgtl5000_dt_ids[] = {
+	{ .compatible = "fsl,mxs-audio-sgtl5000", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_sgtl5000_dt_ids);
+
+static struct platform_driver mxs_sgtl5000_audio_driver = {
+	.driver = {
+		.name = "mxs-sgtl5000",
+		.owner = THIS_MODULE,
+		.of_match_table = mxs_sgtl5000_dt_ids,
+	},
+	.probe = mxs_sgtl5000_probe,
+	.remove = mxs_sgtl5000_remove,
+};
+
+module_platform_driver(mxs_sgtl5000_audio_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MXS ALSA SoC Machine driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-sgtl5000");