sound/soc/fsl/mpc8610_hpcd.c - kernel/bruno - Git at Google

 /**
  * Freescale MPC8610HPCD ALSA SoC Machine driver
  *
  * Author: Timur Tabi <timur@freescale.com>
  *
  * Copyright 2007-2010 Freescale Semiconductor, Inc.
  *
  * This file is licensed under the terms of the GNU General Public License
  * version 2.  This program is licensed "as is" without any warranty of any
  * kind, whether express or implied.
  */

 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/slab.h>
 #include <sound/soc.h>
 #include <asm/fsl_guts.h>

 #include "fsl_dma.h"
 #include "fsl_ssi.h"
 #include "fsl_utils.h"

 /* There's only one global utilities register */
 static phys_addr_t guts_phys;

 /**
  * mpc8610_hpcd_data: machine-specific ASoC device data
  *
  * This structure contains data for a single sound platform device on an
  * MPC8610 HPCD.  Some of the data is taken from the device tree.
  */
 struct mpc8610_hpcd_data {
 	struct snd_soc_dai_link dai[2];
 	struct snd_soc_card card;
 	unsigned int dai_format;
 	unsigned int codec_clk_direction;
 	unsigned int cpu_clk_direction;
 	unsigned int clk_frequency;
 	unsigned int ssi_id;		/* 0 = SSI1, 1 = SSI2, etc */
 	unsigned int dma_id[2];		/* 0 = DMA1, 1 = DMA2, etc */
 	unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
 	char codec_dai_name[DAI_NAME_SIZE];
 	char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
 };

 /**
  * mpc8610_hpcd_machine_probe: initialize the board
  *
  * This function is used to initialize the board-specific hardware.
  *
  * Here we program the DMACR and PMUXCR registers.
  */
 static int mpc8610_hpcd_machine_probe(struct snd_soc_card *card)
 {
 	struct mpc8610_hpcd_data *machine_data =
 		container_of(card, struct mpc8610_hpcd_data, card);
 	struct ccsr_guts __iomem *guts;

 	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 	if (!guts) {
 		dev_err(card->dev, "could not map global utilities\n");
 		return -ENOMEM;
 	}

 	/* Program the signal routing between the SSI and the DMA */
 	guts_set_dmacr(guts, machine_data->dma_id[0],
 		       machine_data->dma_channel_id[0],
 		       CCSR_GUTS_DMACR_DEV_SSI);
 	guts_set_dmacr(guts, machine_data->dma_id[1],
 		       machine_data->dma_channel_id[1],
 		       CCSR_GUTS_DMACR_DEV_SSI);

 	guts_set_pmuxcr_dma(guts, machine_data->dma_id[0],
 			    machine_data->dma_channel_id[0], 0);
 	guts_set_pmuxcr_dma(guts, machine_data->dma_id[1],
 			    machine_data->dma_channel_id[1], 0);

 	switch (machine_data->ssi_id) {
 	case 0:
 		clrsetbits_be32(&guts->pmuxcr,
 			CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
 		break;
 	case 1:
 		clrsetbits_be32(&guts->pmuxcr,
 			CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
 		break;
 	}

 	iounmap(guts);

 	return 0;
 }

 /**
  * mpc8610_hpcd_startup: program the board with various hardware parameters
  *
  * This function takes board-specific information, like clock frequencies
  * and serial data formats, and passes that information to the codec and
  * transport drivers.
  */
 static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct mpc8610_hpcd_data *machine_data =
 		container_of(rtd->card, struct mpc8610_hpcd_data, card);
 	struct device *dev = rtd->card->dev;
 	int ret = 0;

 	/* Tell the codec driver what the serial protocol is. */
 	ret = snd_soc_dai_set_fmt(rtd->codec_dai, machine_data->dai_format);
 	if (ret < 0) {
 		dev_err(dev, "could not set codec driver audio format\n");
 		return ret;
 	}

 	/*
 	 * Tell the codec driver what the MCLK frequency is, and whether it's
 	 * a slave or master.
 	 */
 	ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0,
 				     machine_data->clk_frequency,
 				     machine_data->codec_clk_direction);
 	if (ret < 0) {
 		dev_err(dev, "could not set codec driver clock params\n");
 		return ret;
 	}

 	return 0;
 }

 /**
  * mpc8610_hpcd_machine_remove: Remove the sound device
  *
  * This function is called to remove the sound device for one SSI.  We
  * de-program the DMACR and PMUXCR register.
  */
 static int mpc8610_hpcd_machine_remove(struct snd_soc_card *card)
 {
 	struct mpc8610_hpcd_data *machine_data =
 		container_of(card, struct mpc8610_hpcd_data, card);
 	struct ccsr_guts __iomem *guts;

 	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
 	if (!guts) {
 		dev_err(card->dev, "could not map global utilities\n");
 		return -ENOMEM;
 	}

 	/* Restore the signal routing */

 	guts_set_dmacr(guts, machine_data->dma_id[0],
 		       machine_data->dma_channel_id[0], 0);
 	guts_set_dmacr(guts, machine_data->dma_id[1],
 		       machine_data->dma_channel_id[1], 0);

 	switch (machine_data->ssi_id) {
 	case 0:
 		clrsetbits_be32(&guts->pmuxcr,
 			CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
 		break;
 	case 1:
 		clrsetbits_be32(&guts->pmuxcr,
 			CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
 		break;
 	}

 	iounmap(guts);

 	return 0;
 }

 /**
  * mpc8610_hpcd_ops: ASoC machine driver operations
  */
 static struct snd_soc_ops mpc8610_hpcd_ops = {
 	.startup = mpc8610_hpcd_startup,
 };

 /**
  * mpc8610_hpcd_probe: platform probe function for the machine driver
  *
  * Although this is a machine driver, the SSI node is the "master" node with
  * respect to audio hardware connections.  Therefore, we create a new ASoC
  * device for each new SSI node that has a codec attached.
  */
 static int mpc8610_hpcd_probe(struct platform_device *pdev)
 {
 	struct device *dev = pdev->dev.parent;
 	/* ssi_pdev is the platform device for the SSI node that probed us */
 	struct platform_device *ssi_pdev =
 		container_of(dev, struct platform_device, dev);
 	struct device_node *np = ssi_pdev->dev.of_node;
 	struct device_node *codec_np = NULL;
 	struct mpc8610_hpcd_data *machine_data;
 	int ret = -ENODEV;
 	const char *sprop;
 	const u32 *iprop;

 	/* Find the codec node for this SSI. */
 	codec_np = of_parse_phandle(np, "codec-handle", 0);
 	if (!codec_np) {
 		dev_err(dev, "invalid codec node\n");
 		return -EINVAL;
 	}

 	machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
 	if (!machine_data) {
 		ret = -ENOMEM;
 		goto error_alloc;
 	}

 	machine_data->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
 	machine_data->dai[0].ops = &mpc8610_hpcd_ops;

 	/* ASoC core can match codec with device node */
 	machine_data->dai[0].codec_of_node = codec_np;

 	/* The DAI name from the codec (snd_soc_dai_driver.name) */
 	machine_data->dai[0].codec_dai_name = "cs4270-hifi";

 	/* We register two DAIs per SSI, one for playback and the other for
 	 * capture.  Currently, we only support codecs that have one DAI for
 	 * both playback and capture.
 	 */
 	memcpy(&machine_data->dai[1], &machine_data->dai[0],
 	       sizeof(struct snd_soc_dai_link));

 	/* Get the device ID */
 	iprop = of_get_property(np, "cell-index", NULL);
 	if (!iprop) {
 		dev_err(&pdev->dev, "cell-index property not found\n");
 		ret = -EINVAL;
 		goto error;
 	}
 	machine_data->ssi_id = be32_to_cpup(iprop);

 	/* Get the serial format and clock direction. */
 	sprop = of_get_property(np, "fsl,mode", NULL);
 	if (!sprop) {
 		dev_err(&pdev->dev, "fsl,mode property not found\n");
 		ret = -EINVAL;
 		goto error;
 	}

 	if (strcasecmp(sprop, "i2s-slave") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;

 		/* In i2s-slave mode, the codec has its own clock source, so we
 		 * need to get the frequency from the device tree and pass it to
 		 * the codec driver.
 		 */
 		iprop = of_get_property(codec_np, "clock-frequency", NULL);
 		if (!iprop || !*iprop) {
 			dev_err(&pdev->dev, "codec bus-frequency "
 				"property is missing or invalid\n");
 			ret = -EINVAL;
 			goto error;
 		}
 		machine_data->clk_frequency = be32_to_cpup(iprop);
 	} else if (strcasecmp(sprop, "i2s-master") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else if (strcasecmp(sprop, "lj-slave") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 	} else if (strcasecmp(sprop, "lj-master") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else if (strcasecmp(sprop, "rj-slave") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 	} else if (strcasecmp(sprop, "rj-master") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else if (strcasecmp(sprop, "ac97-slave") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
 	} else if (strcasecmp(sprop, "ac97-master") == 0) {
 		machine_data->dai_format =
 			SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
 		machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
 		machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else {
 		dev_err(&pdev->dev,
 			"unrecognized fsl,mode property '%s'\n", sprop);
 		ret = -EINVAL;
 		goto error;
 	}

 	if (!machine_data->clk_frequency) {
 		dev_err(&pdev->dev, "unknown clock frequency\n");
 		ret = -EINVAL;
 		goto error;
 	}

 	/* Find the playback DMA channel to use. */
 	machine_data->dai[0].platform_name = machine_data->platform_name[0];
 	ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
 				       &machine_data->dai[0],
 				       &machine_data->dma_channel_id[0],
 				       &machine_data->dma_id[0]);
 	if (ret) {
 		dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
 		goto error;
 	}

 	/* Find the capture DMA channel to use. */
 	machine_data->dai[1].platform_name = machine_data->platform_name[1];
 	ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma",
 				       &machine_data->dai[1],
 				       &machine_data->dma_channel_id[1],
 				       &machine_data->dma_id[1]);
 	if (ret) {
 		dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
 		goto error;
 	}

 	/* Initialize our DAI data structure.  */
 	machine_data->dai[0].stream_name = "playback";
 	machine_data->dai[1].stream_name = "capture";
 	machine_data->dai[0].name = machine_data->dai[0].stream_name;
 	machine_data->dai[1].name = machine_data->dai[1].stream_name;

 	machine_data->card.probe = mpc8610_hpcd_machine_probe;
 	machine_data->card.remove = mpc8610_hpcd_machine_remove;
 	machine_data->card.name = pdev->name; /* The platform driver name */
 	machine_data->card.owner = THIS_MODULE;
 	machine_data->card.dev = &pdev->dev;
 	machine_data->card.num_links = 2;
 	machine_data->card.dai_link = machine_data->dai;

 	/* Register with ASoC */
 	ret = snd_soc_register_card(&machine_data->card);
 	if (ret) {
 		dev_err(&pdev->dev, "could not register card\n");
 		goto error;
 	}

 	of_node_put(codec_np);

 	return 0;

 error:
 	kfree(machine_data);
 error_alloc:
 	of_node_put(codec_np);
 	return ret;
 }

 /**
  * mpc8610_hpcd_remove: remove the platform device
  *
  * This function is called when the platform device is removed.
  */
 static int mpc8610_hpcd_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct mpc8610_hpcd_data *machine_data =
 		container_of(card, struct mpc8610_hpcd_data, card);

 	snd_soc_unregister_card(card);
 	kfree(machine_data);

 	return 0;
 }

 static struct platform_driver mpc8610_hpcd_driver = {
 	.probe = mpc8610_hpcd_probe,
 	.remove = mpc8610_hpcd_remove,
 	.driver = {
 		/* The name must match 'compatible' property in the device tree,
 		 * in lowercase letters.
 		 */
 		.name = "snd-soc-mpc8610hpcd",
 	},
 };

 /**
  * mpc8610_hpcd_init: machine driver initialization.
  *
  * This function is called when this module is loaded.
  */
 static int __init mpc8610_hpcd_init(void)
 {
 	struct device_node *guts_np;
 	struct resource res;

 	pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");

 	/* Get the physical address of the global utilities registers */
 	guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
 	if (of_address_to_resource(guts_np, 0, &res)) {
 		pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
 		return -EINVAL;
 	}
 	guts_phys = res.start;

 	return platform_driver_register(&mpc8610_hpcd_driver);
 }

 /**
  * mpc8610_hpcd_exit: machine driver exit
  *
  * This function is called when this driver is unloaded.
  */
 static void __exit mpc8610_hpcd_exit(void)
 {
 	platform_driver_unregister(&mpc8610_hpcd_driver);
 }

 module_init(mpc8610_hpcd_init);
 module_exit(mpc8610_hpcd_exit);

 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC machine driver");
 MODULE_LICENSE("GPL v2");
	/**
	* Freescale MPC8610HPCD ALSA SoC Machine driver
	*
	* Author: Timur Tabi <timur@freescale.com>
	*
	* Copyright 2007-2010 Freescale Semiconductor, Inc.
	*
	* This file is licensed under the terms of the GNU General Public License
	* version 2. This program is licensed "as is" without any warranty of any
	* kind, whether express or implied.
	*/

	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/of_address.h>
	#include <linux/of_device.h>
	#include <linux/slab.h>
	#include <sound/soc.h>
	#include <asm/fsl_guts.h>

	#include "fsl_dma.h"
	#include "fsl_ssi.h"
	#include "fsl_utils.h"

	/* There's only one global utilities register */
	static phys_addr_t guts_phys;

	/**
	* mpc8610_hpcd_data: machine-specific ASoC device data
	*
	* This structure contains data for a single sound platform device on an
	* MPC8610 HPCD. Some of the data is taken from the device tree.
	*/
	struct mpc8610_hpcd_data {
	struct snd_soc_dai_link dai[2];
	struct snd_soc_card card;
	unsigned int dai_format;
	unsigned int codec_clk_direction;
	unsigned int cpu_clk_direction;
	unsigned int clk_frequency;
	unsigned int ssi_id; /* 0 = SSI1, 1 = SSI2, etc */
	unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */
	unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/
	char codec_dai_name[DAI_NAME_SIZE];
	char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
	};

	/**
	* mpc8610_hpcd_machine_probe: initialize the board
	*
	* This function is used to initialize the board-specific hardware.
	*
	* Here we program the DMACR and PMUXCR registers.
	*/
	static int mpc8610_hpcd_machine_probe(struct snd_soc_card *card)
	{
	struct mpc8610_hpcd_data *machine_data =
	container_of(card, struct mpc8610_hpcd_data, card);
	struct ccsr_guts __iomem *guts;

	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
	if (!guts) {
	dev_err(card->dev, "could not map global utilities\n");
	return -ENOMEM;
	}

	/* Program the signal routing between the SSI and the DMA */
	guts_set_dmacr(guts, machine_data->dma_id[0],
	machine_data->dma_channel_id[0],
	CCSR_GUTS_DMACR_DEV_SSI);
	guts_set_dmacr(guts, machine_data->dma_id[1],
	machine_data->dma_channel_id[1],
	CCSR_GUTS_DMACR_DEV_SSI);

	guts_set_pmuxcr_dma(guts, machine_data->dma_id[0],
	machine_data->dma_channel_id[0], 0);
	guts_set_pmuxcr_dma(guts, machine_data->dma_id[1],
	machine_data->dma_channel_id[1], 0);

	switch (machine_data->ssi_id) {
	case 0:
	clrsetbits_be32(&guts->pmuxcr,
	CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_SSI);
	break;
	case 1:
	clrsetbits_be32(&guts->pmuxcr,
	CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_SSI);
	break;
	}

	iounmap(guts);

	return 0;
	}

	/**
	* mpc8610_hpcd_startup: program the board with various hardware parameters
	*
	* This function takes board-specific information, like clock frequencies
	* and serial data formats, and passes that information to the codec and
	* transport drivers.
	*/
	static int mpc8610_hpcd_startup(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct mpc8610_hpcd_data *machine_data =
	container_of(rtd->card, struct mpc8610_hpcd_data, card);
	struct device *dev = rtd->card->dev;
	int ret = 0;

	/* Tell the codec driver what the serial protocol is. */
	ret = snd_soc_dai_set_fmt(rtd->codec_dai, machine_data->dai_format);
	if (ret < 0) {
	dev_err(dev, "could not set codec driver audio format\n");
	return ret;
	}

	/*
	* Tell the codec driver what the MCLK frequency is, and whether it's
	* a slave or master.
	*/
	ret = snd_soc_dai_set_sysclk(rtd->codec_dai, 0,
	machine_data->clk_frequency,
	machine_data->codec_clk_direction);
	if (ret < 0) {
	dev_err(dev, "could not set codec driver clock params\n");
	return ret;
	}

	return 0;
	}

	/**
	* mpc8610_hpcd_machine_remove: Remove the sound device
	*
	* This function is called to remove the sound device for one SSI. We
	* de-program the DMACR and PMUXCR register.
	*/
	static int mpc8610_hpcd_machine_remove(struct snd_soc_card *card)
	{
	struct mpc8610_hpcd_data *machine_data =
	container_of(card, struct mpc8610_hpcd_data, card);
	struct ccsr_guts __iomem *guts;

	guts = ioremap(guts_phys, sizeof(struct ccsr_guts));
	if (!guts) {
	dev_err(card->dev, "could not map global utilities\n");
	return -ENOMEM;
	}

	/* Restore the signal routing */

	guts_set_dmacr(guts, machine_data->dma_id[0],
	machine_data->dma_channel_id[0], 0);
	guts_set_dmacr(guts, machine_data->dma_id[1],
	machine_data->dma_channel_id[1], 0);

	switch (machine_data->ssi_id) {
	case 0:
	clrsetbits_be32(&guts->pmuxcr,
	CCSR_GUTS_PMUXCR_SSI1_MASK, CCSR_GUTS_PMUXCR_SSI1_LA);
	break;
	case 1:
	clrsetbits_be32(&guts->pmuxcr,
	CCSR_GUTS_PMUXCR_SSI2_MASK, CCSR_GUTS_PMUXCR_SSI2_LA);
	break;
	}

	iounmap(guts);

	return 0;
	}

	/**
	* mpc8610_hpcd_ops: ASoC machine driver operations
	*/
	static struct snd_soc_ops mpc8610_hpcd_ops = {
	.startup = mpc8610_hpcd_startup,
	};

	/**
	* mpc8610_hpcd_probe: platform probe function for the machine driver
	*
	* Although this is a machine driver, the SSI node is the "master" node with
	* respect to audio hardware connections. Therefore, we create a new ASoC
	* device for each new SSI node that has a codec attached.
	*/
	static int mpc8610_hpcd_probe(struct platform_device *pdev)
	{
	struct device *dev = pdev->dev.parent;
	/* ssi_pdev is the platform device for the SSI node that probed us */
	struct platform_device *ssi_pdev =
	container_of(dev, struct platform_device, dev);
	struct device_node *np = ssi_pdev->dev.of_node;
	struct device_node *codec_np = NULL;
	struct mpc8610_hpcd_data *machine_data;
	int ret = -ENODEV;
	const char *sprop;
	const u32 *iprop;

	/* Find the codec node for this SSI. */
	codec_np = of_parse_phandle(np, "codec-handle", 0);
	if (!codec_np) {
	dev_err(dev, "invalid codec node\n");
	return -EINVAL;
	}

	machine_data = kzalloc(sizeof(struct mpc8610_hpcd_data), GFP_KERNEL);
	if (!machine_data) {
	ret = -ENOMEM;
	goto error_alloc;
	}

	machine_data->dai[0].cpu_dai_name = dev_name(&ssi_pdev->dev);
	machine_data->dai[0].ops = &mpc8610_hpcd_ops;

	/* ASoC core can match codec with device node */
	machine_data->dai[0].codec_of_node = codec_np;

	/* The DAI name from the codec (snd_soc_dai_driver.name) */
	machine_data->dai[0].codec_dai_name = "cs4270-hifi";

	/* We register two DAIs per SSI, one for playback and the other for
	* capture. Currently, we only support codecs that have one DAI for
	* both playback and capture.
	*/
	memcpy(&machine_data->dai[1], &machine_data->dai[0],
	sizeof(struct snd_soc_dai_link));

	/* Get the device ID */
	iprop = of_get_property(np, "cell-index", NULL);
	if (!iprop) {
	dev_err(&pdev->dev, "cell-index property not found\n");
	ret = -EINVAL;
	goto error;
	}
	machine_data->ssi_id = be32_to_cpup(iprop);

	/* Get the serial format and clock direction. */
	sprop = of_get_property(np, "fsl,mode", NULL);
	if (!sprop) {
	dev_err(&pdev->dev, "fsl,mode property not found\n");
	ret = -EINVAL;
	goto error;
	}

	if (strcasecmp(sprop, "i2s-slave") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_CBM_CFM;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;

	/* In i2s-slave mode, the codec has its own clock source, so we
	* need to get the frequency from the device tree and pass it to
	* the codec driver.
	*/
	iprop = of_get_property(codec_np, "clock-frequency", NULL);
	if (!iprop \|\| !*iprop) {
	dev_err(&pdev->dev, "codec bus-frequency "
	"property is missing or invalid\n");
	ret = -EINVAL;
	goto error;
	}
	machine_data->clk_frequency = be32_to_cpup(iprop);
	} else if (strcasecmp(sprop, "i2s-master") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_CBS_CFS;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "lj-slave") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_LEFT_J \| SND_SOC_DAIFMT_CBM_CFM;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "lj-master") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_LEFT_J \| SND_SOC_DAIFMT_CBS_CFS;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "rj-slave") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_RIGHT_J \| SND_SOC_DAIFMT_CBM_CFM;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "rj-master") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_RIGHT_J \| SND_SOC_DAIFMT_CBS_CFS;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "ac97-slave") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_AC97 \| SND_SOC_DAIFMT_CBM_CFM;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_OUT;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "ac97-master") == 0) {
	machine_data->dai_format =
	SND_SOC_DAIFMT_AC97 \| SND_SOC_DAIFMT_CBS_CFS;
	machine_data->codec_clk_direction = SND_SOC_CLOCK_IN;
	machine_data->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else {
	dev_err(&pdev->dev,
	"unrecognized fsl,mode property '%s'\n", sprop);
	ret = -EINVAL;
	goto error;
	}

	if (!machine_data->clk_frequency) {
	dev_err(&pdev->dev, "unknown clock frequency\n");
	ret = -EINVAL;
	goto error;
	}

	/* Find the playback DMA channel to use. */
	machine_data->dai[0].platform_name = machine_data->platform_name[0];
	ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma",
	&machine_data->dai[0],
	&machine_data->dma_channel_id[0],
	&machine_data->dma_id[0]);
	if (ret) {
	dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n");
	goto error;
	}

	/* Find the capture DMA channel to use. */
	machine_data->dai[1].platform_name = machine_data->platform_name[1];
	ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma",
	&machine_data->dai[1],
	&machine_data->dma_channel_id[1],
	&machine_data->dma_id[1]);
	if (ret) {
	dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n");
	goto error;
	}

	/* Initialize our DAI data structure. */
	machine_data->dai[0].stream_name = "playback";
	machine_data->dai[1].stream_name = "capture";
	machine_data->dai[0].name = machine_data->dai[0].stream_name;
	machine_data->dai[1].name = machine_data->dai[1].stream_name;

	machine_data->card.probe = mpc8610_hpcd_machine_probe;
	machine_data->card.remove = mpc8610_hpcd_machine_remove;
	machine_data->card.name = pdev->name; /* The platform driver name */
	machine_data->card.owner = THIS_MODULE;
	machine_data->card.dev = &pdev->dev;
	machine_data->card.num_links = 2;
	machine_data->card.dai_link = machine_data->dai;

	/* Register with ASoC */
	ret = snd_soc_register_card(&machine_data->card);
	if (ret) {
	dev_err(&pdev->dev, "could not register card\n");
	goto error;
	}

	of_node_put(codec_np);

	return 0;

	error:
	kfree(machine_data);
	error_alloc:
	of_node_put(codec_np);
	return ret;
	}

	/**
	* mpc8610_hpcd_remove: remove the platform device
	*
	* This function is called when the platform device is removed.
	*/
	static int mpc8610_hpcd_remove(struct platform_device *pdev)
	{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct mpc8610_hpcd_data *machine_data =
	container_of(card, struct mpc8610_hpcd_data, card);

	snd_soc_unregister_card(card);
	kfree(machine_data);

	return 0;
	}

	static struct platform_driver mpc8610_hpcd_driver = {
	.probe = mpc8610_hpcd_probe,
	.remove = mpc8610_hpcd_remove,
	.driver = {
	/* The name must match 'compatible' property in the device tree,
	* in lowercase letters.
	*/
	.name = "snd-soc-mpc8610hpcd",
	},
	};

	/**
	* mpc8610_hpcd_init: machine driver initialization.
	*
	* This function is called when this module is loaded.
	*/
	static int __init mpc8610_hpcd_init(void)
	{
	struct device_node *guts_np;
	struct resource res;

	pr_info("Freescale MPC8610 HPCD ALSA SoC machine driver\n");

	/* Get the physical address of the global utilities registers */
	guts_np = of_find_compatible_node(NULL, NULL, "fsl,mpc8610-guts");
	if (of_address_to_resource(guts_np, 0, &res)) {
	pr_err("mpc8610-hpcd: missing/invalid global utilities node\n");
	return -EINVAL;
	}
	guts_phys = res.start;

	return platform_driver_register(&mpc8610_hpcd_driver);
	}

	/**
	* mpc8610_hpcd_exit: machine driver exit
	*
	* This function is called when this driver is unloaded.
	*/
	static void __exit mpc8610_hpcd_exit(void)
	{
	platform_driver_unregister(&mpc8610_hpcd_driver);
	}

	module_init(mpc8610_hpcd_init);
	module_exit(mpc8610_hpcd_exit);

	MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
	MODULE_DESCRIPTION("Freescale MPC8610 HPCD ALSA SoC machine driver");
	MODULE_LICENSE("GPL v2");