sound/soc/fsl/p1022_ds.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 //
 // Freescale P1022DS ALSA SoC Machine driver
 //
 // Author: Timur Tabi <timur@freescale.com>
 //
 // Copyright 2010 Freescale Semiconductor, Inc.

 #include <linux/module.h>
 #include <linux/fsl/guts.h>
 #include <linux/interrupt.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/slab.h>
 #include <sound/soc.h>

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

 /* P1022-specific PMUXCR and DMUXCR bit definitions */

 #define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK	0x0001c000
 #define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI	0x00010000
 #define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI		0x00018000

 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK	0x00000c00
 #define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI	0x00000000

 #define CCSR_GUTS_DMUXCR_PAD	1	/* DMA controller/channel set to pad */
 #define CCSR_GUTS_DMUXCR_SSI	2	/* DMA controller/channel set to SSI */

 /*
  * Set the DMACR register in the GUTS
  *
  * The DMACR register determines the source of initiated transfers for each
  * channel on each DMA controller.  Rather than have a bunch of repetitive
  * macros for the bit patterns, we just have a function that calculates
  * them.
  *
  * guts: Pointer to GUTS structure
  * co: The DMA controller (0 or 1)
  * ch: The channel on the DMA controller (0, 1, 2, or 3)
  * device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
  */
 static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
 	unsigned int co, unsigned int ch, unsigned int device)
 {
 	unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));

 	clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
 }

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

 /**
  * machine_data: machine-specific ASoC device data
  *
  * This structure contains data for a single sound platform device on an
  * P1022 DS.  Some of the data is taken from the device tree.
  */
 struct machine_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 platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
 };

 /**
  * p1022_ds_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 p1022_ds_machine_probe(struct snd_soc_card *card)
 {
 	struct machine_data *mdata =
 		container_of(card, struct machine_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;
 	}

 	/* Enable SSI Tx signal */
 	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
 			CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);

 	/* Enable SSI Rx signal */
 	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
 			CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);

 	/* Enable DMA Channel for SSI */
 	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
 			CCSR_GUTS_DMUXCR_SSI);

 	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
 			CCSR_GUTS_DMUXCR_SSI);

 	iounmap(guts);

 	return 0;
 }

 /**
  * p1022_ds_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 p1022_ds_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct machine_data *mdata =
 		container_of(rtd->card, struct machine_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(asoc_rtd_to_codec(rtd, 0), mdata->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(asoc_rtd_to_codec(rtd, 0), 0, mdata->clk_frequency,
 				     mdata->codec_clk_direction);
 	if (ret < 0) {
 		dev_err(dev, "could not set codec driver clock params\n");
 		return ret;
 	}

 	return 0;
 }

 /**
  * p1022_ds_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 p1022_ds_machine_remove(struct snd_soc_card *card)
 {
 	struct machine_data *mdata =
 		container_of(card, struct machine_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 */
 	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
 	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
 	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
 	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);

 	iounmap(guts);

 	return 0;
 }

 /**
  * p1022_ds_ops: ASoC machine driver operations
  */
 static const struct snd_soc_ops p1022_ds_ops = {
 	.startup = p1022_ds_startup,
 };

 /**
  * p1022_ds_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 p1022_ds_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 = to_platform_device(dev);
 	struct device_node *np = ssi_pdev->dev.of_node;
 	struct device_node *codec_np = NULL;
 	struct machine_data *mdata;
 	struct snd_soc_dai_link_component *comp;
 	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, "could not find codec node\n");
 		return -EINVAL;
 	}

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

 	comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL);
 	if (!comp) {
 		ret = -ENOMEM;
 		goto error_put;
 	}

 	mdata->dai[0].cpus	= &comp[0];
 	mdata->dai[0].codecs	= &comp[1];
 	mdata->dai[0].platforms	= &comp[2];

 	mdata->dai[0].num_cpus		= 1;
 	mdata->dai[0].num_codecs	= 1;
 	mdata->dai[0].num_platforms	= 1;

 	mdata->dai[1].cpus	= &comp[3];
 	mdata->dai[1].codecs	= &comp[4];
 	mdata->dai[1].platforms	= &comp[5];

 	mdata->dai[1].num_cpus		= 1;
 	mdata->dai[1].num_codecs	= 1;
 	mdata->dai[1].num_platforms	= 1;


 	mdata->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev);
 	mdata->dai[0].ops = &p1022_ds_ops;

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

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

 	/* The DAI names from the codec (snd_soc_dai_driver.name) */
 	mdata->dai[0].codecs->dai_name = "wm8776-hifi-playback";
 	mdata->dai[1].codecs->dai_name = "wm8776-hifi-capture";

 	/* 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;
 	}
 	mdata->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) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		mdata->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;
 		}
 		mdata->clk_frequency = be32_to_cpup(iprop);
 	} else if (strcasecmp(sprop, "i2s-master") == 0) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 		mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else if (strcasecmp(sprop, "lj-slave") == 0) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 	} else if (strcasecmp(sprop, "lj-master") == 0) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 		mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else if (strcasecmp(sprop, "rj-slave") == 0) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 	} else if (strcasecmp(sprop, "rj-master") == 0) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 		mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else if (strcasecmp(sprop, "ac97-slave") == 0) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
 		mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
 	} else if (strcasecmp(sprop, "ac97-master") == 0) {
 		mdata->dai_format = SND_SOC_DAIFMT_NB_NF |
 			SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS;
 		mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
 		mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
 	} else {
 		dev_err(&pdev->dev,
 			"unrecognized fsl,mode property '%s'\n", sprop);
 		ret = -EINVAL;
 		goto error;
 	}

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

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

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

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

 	mdata->card.probe = p1022_ds_machine_probe;
 	mdata->card.remove = p1022_ds_machine_remove;
 	mdata->card.name = pdev->name; /* The platform driver name */
 	mdata->card.owner = THIS_MODULE;
 	mdata->card.dev = &pdev->dev;
 	mdata->card.num_links = 2;
 	mdata->card.dai_link = mdata->dai;

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

 	of_node_put(codec_np);

 	return 0;

 error:
 	kfree(mdata);
 error_put:
 	of_node_put(codec_np);
 	return ret;
 }

 /**
  * p1022_ds_remove: remove the platform device
  *
  * This function is called when the platform device is removed.
  */
 static int p1022_ds_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct machine_data *mdata =
 		container_of(card, struct machine_data, card);

 	snd_soc_unregister_card(card);
 	kfree(mdata);

 	return 0;
 }

 static struct platform_driver p1022_ds_driver = {
 	.probe = p1022_ds_probe,
 	.remove = p1022_ds_remove,
 	.driver = {
 		/*
 		 * The name must match 'compatible' property in the device tree,
 		 * in lowercase letters.
 		 */
 		.name = "snd-soc-p1022ds",
 	},
 };

 /**
  * p1022_ds_init: machine driver initialization.
  *
  * This function is called when this module is loaded.
  */
 static int __init p1022_ds_init(void)
 {
 	struct device_node *guts_np;
 	struct resource res;

 	/* Get the physical address of the global utilities registers */
 	guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
 	if (of_address_to_resource(guts_np, 0, &res)) {
 		pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
 		of_node_put(guts_np);
 		return -EINVAL;
 	}
 	guts_phys = res.start;
 	of_node_put(guts_np);

 	return platform_driver_register(&p1022_ds_driver);
 }

 /**
  * p1022_ds_exit: machine driver exit
  *
  * This function is called when this driver is unloaded.
  */
 static void __exit p1022_ds_exit(void)
 {
 	platform_driver_unregister(&p1022_ds_driver);
 }

 module_init(p1022_ds_init);
 module_exit(p1022_ds_exit);

 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	//
	// Freescale P1022DS ALSA SoC Machine driver
	//
	// Author: Timur Tabi <timur@freescale.com>
	//
	// Copyright 2010 Freescale Semiconductor, Inc.

	#include <linux/module.h>
	#include <linux/fsl/guts.h>
	#include <linux/interrupt.h>
	#include <linux/of_address.h>
	#include <linux/of_device.h>
	#include <linux/slab.h>
	#include <sound/soc.h>

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

	/* P1022-specific PMUXCR and DMUXCR bit definitions */

	#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000
	#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000
	#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000

	#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00
	#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000

	#define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */
	#define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */

	/*
	* Set the DMACR register in the GUTS
	*
	* The DMACR register determines the source of initiated transfers for each
	* channel on each DMA controller. Rather than have a bunch of repetitive
	* macros for the bit patterns, we just have a function that calculates
	* them.
	*
	* guts: Pointer to GUTS structure
	* co: The DMA controller (0 or 1)
	* ch: The channel on the DMA controller (0, 1, 2, or 3)
	* device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx)
	*/
	static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts,
	unsigned int co, unsigned int ch, unsigned int device)
	{
	unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch));

	clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift);
	}

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

	/**
	* machine_data: machine-specific ASoC device data
	*
	* This structure contains data for a single sound platform device on an
	* P1022 DS. Some of the data is taken from the device tree.
	*/
	struct machine_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 platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */
	};

	/**
	* p1022_ds_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 p1022_ds_machine_probe(struct snd_soc_card *card)
	{
	struct machine_data *mdata =
	container_of(card, struct machine_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;
	}

	/* Enable SSI Tx signal */
	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK,
	CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI);

	/* Enable SSI Rx signal */
	clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK,
	CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI);

	/* Enable DMA Channel for SSI */
	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0],
	CCSR_GUTS_DMUXCR_SSI);

	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1],
	CCSR_GUTS_DMUXCR_SSI);

	iounmap(guts);

	return 0;
	}

	/**
	* p1022_ds_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 p1022_ds_startup(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct machine_data *mdata =
	container_of(rtd->card, struct machine_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(asoc_rtd_to_codec(rtd, 0), mdata->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(asoc_rtd_to_codec(rtd, 0), 0, mdata->clk_frequency,
	mdata->codec_clk_direction);
	if (ret < 0) {
	dev_err(dev, "could not set codec driver clock params\n");
	return ret;
	}

	return 0;
	}

	/**
	* p1022_ds_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 p1022_ds_machine_remove(struct snd_soc_card *card)
	{
	struct machine_data *mdata =
	container_of(card, struct machine_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 */
	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK);
	clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK);
	guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0);
	guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0);

	iounmap(guts);

	return 0;
	}

	/**
	* p1022_ds_ops: ASoC machine driver operations
	*/
	static const struct snd_soc_ops p1022_ds_ops = {
	.startup = p1022_ds_startup,
	};

	/**
	* p1022_ds_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 p1022_ds_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 = to_platform_device(dev);
	struct device_node *np = ssi_pdev->dev.of_node;
	struct device_node *codec_np = NULL;
	struct machine_data *mdata;
	struct snd_soc_dai_link_component *comp;
	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, "could not find codec node\n");
	return -EINVAL;
	}

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

	comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL);
	if (!comp) {
	ret = -ENOMEM;
	goto error_put;
	}

	mdata->dai[0].cpus = &comp[0];
	mdata->dai[0].codecs = &comp[1];
	mdata->dai[0].platforms = &comp[2];

	mdata->dai[0].num_cpus = 1;
	mdata->dai[0].num_codecs = 1;
	mdata->dai[0].num_platforms = 1;

	mdata->dai[1].cpus = &comp[3];
	mdata->dai[1].codecs = &comp[4];
	mdata->dai[1].platforms = &comp[5];

	mdata->dai[1].num_cpus = 1;
	mdata->dai[1].num_codecs = 1;
	mdata->dai[1].num_platforms = 1;


	mdata->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev);
	mdata->dai[0].ops = &p1022_ds_ops;

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

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

	/* The DAI names from the codec (snd_soc_dai_driver.name) */
	mdata->dai[0].codecs->dai_name = "wm8776-hifi-playback";
	mdata->dai[1].codecs->dai_name = "wm8776-hifi-capture";

	/* 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;
	}
	mdata->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) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_CBM_CFM;
	mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
	mdata->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;
	}
	mdata->clk_frequency = be32_to_cpup(iprop);
	} else if (strcasecmp(sprop, "i2s-master") == 0) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_CBS_CFS;
	mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
	mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "lj-slave") == 0) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_LEFT_J \| SND_SOC_DAIFMT_CBM_CFM;
	mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
	mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "lj-master") == 0) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_LEFT_J \| SND_SOC_DAIFMT_CBS_CFS;
	mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
	mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "rj-slave") == 0) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_RIGHT_J \| SND_SOC_DAIFMT_CBM_CFM;
	mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
	mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "rj-master") == 0) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_RIGHT_J \| SND_SOC_DAIFMT_CBS_CFS;
	mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
	mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else if (strcasecmp(sprop, "ac97-slave") == 0) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_AC97 \| SND_SOC_DAIFMT_CBM_CFM;
	mdata->codec_clk_direction = SND_SOC_CLOCK_OUT;
	mdata->cpu_clk_direction = SND_SOC_CLOCK_IN;
	} else if (strcasecmp(sprop, "ac97-master") == 0) {
	mdata->dai_format = SND_SOC_DAIFMT_NB_NF \|
	SND_SOC_DAIFMT_AC97 \| SND_SOC_DAIFMT_CBS_CFS;
	mdata->codec_clk_direction = SND_SOC_CLOCK_IN;
	mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT;
	} else {
	dev_err(&pdev->dev,
	"unrecognized fsl,mode property '%s'\n", sprop);
	ret = -EINVAL;
	goto error;
	}

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

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

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

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

	mdata->card.probe = p1022_ds_machine_probe;
	mdata->card.remove = p1022_ds_machine_remove;
	mdata->card.name = pdev->name; /* The platform driver name */
	mdata->card.owner = THIS_MODULE;
	mdata->card.dev = &pdev->dev;
	mdata->card.num_links = 2;
	mdata->card.dai_link = mdata->dai;

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

	of_node_put(codec_np);

	return 0;

	error:
	kfree(mdata);
	error_put:
	of_node_put(codec_np);
	return ret;
	}

	/**
	* p1022_ds_remove: remove the platform device
	*
	* This function is called when the platform device is removed.
	*/
	static int p1022_ds_remove(struct platform_device *pdev)
	{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct machine_data *mdata =
	container_of(card, struct machine_data, card);

	snd_soc_unregister_card(card);
	kfree(mdata);

	return 0;
	}

	static struct platform_driver p1022_ds_driver = {
	.probe = p1022_ds_probe,
	.remove = p1022_ds_remove,
	.driver = {
	/*
	* The name must match 'compatible' property in the device tree,
	* in lowercase letters.
	*/
	.name = "snd-soc-p1022ds",
	},
	};

	/**
	* p1022_ds_init: machine driver initialization.
	*
	* This function is called when this module is loaded.
	*/
	static int __init p1022_ds_init(void)
	{
	struct device_node *guts_np;
	struct resource res;

	/* Get the physical address of the global utilities registers */
	guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts");
	if (of_address_to_resource(guts_np, 0, &res)) {
	pr_err("snd-soc-p1022ds: missing/invalid global utils node\n");
	of_node_put(guts_np);
	return -EINVAL;
	}
	guts_phys = res.start;
	of_node_put(guts_np);

	return platform_driver_register(&p1022_ds_driver);
	}

	/**
	* p1022_ds_exit: machine driver exit
	*
	* This function is called when this driver is unloaded.
	*/
	static void __exit p1022_ds_exit(void)
	{
	platform_driver_unregister(&p1022_ds_driver);
	}

	module_init(p1022_ds_init);
	module_exit(p1022_ds_exit);

	MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
	MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver");
	MODULE_LICENSE("GPL v2");