sound/pci/hda/hda_tegra.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  *
  * Implementation of primary ALSA driver code base for NVIDIA Tegra HDA.
  */

 #include <linux/clk.h>
 #include <linux/clocksource.h>
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/mutex.h>
 #include <linux/of_device.h>
 #include <linux/slab.h>
 #include <linux/time.h>
 #include <linux/string.h>
 #include <linux/pm_runtime.h>

 #include <sound/core.h>
 #include <sound/initval.h>

 #include <sound/hda_codec.h>
 #include "hda_controller.h"

 /* Defines for Nvidia Tegra HDA support */
 #define HDA_BAR0           0x8000

 #define HDA_CFG_CMD        0x1004
 #define HDA_CFG_BAR0       0x1010

 #define HDA_ENABLE_IO_SPACE       (1 << 0)
 #define HDA_ENABLE_MEM_SPACE      (1 << 1)
 #define HDA_ENABLE_BUS_MASTER     (1 << 2)
 #define HDA_ENABLE_SERR           (1 << 8)
 #define HDA_DISABLE_INTR          (1 << 10)
 #define HDA_BAR0_INIT_PROGRAM     0xFFFFFFFF
 #define HDA_BAR0_FINAL_PROGRAM    (1 << 14)

 /* IPFS */
 #define HDA_IPFS_CONFIG           0x180
 #define HDA_IPFS_EN_FPCI          0x1

 #define HDA_IPFS_FPCI_BAR0        0x80
 #define HDA_FPCI_BAR0_START       0x40

 #define HDA_IPFS_INTR_MASK        0x188
 #define HDA_IPFS_EN_INTR          (1 << 16)

 /* max number of SDs */
 #define NUM_CAPTURE_SD 1
 #define NUM_PLAYBACK_SD 1

 struct hda_tegra {
 	struct azx chip;
 	struct device *dev;
 	struct clk *hda_clk;
 	struct clk *hda2codec_2x_clk;
 	struct clk *hda2hdmi_clk;
 	void __iomem *regs;
 	struct work_struct probe_work;
 };

 #ifdef CONFIG_PM
 static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
 module_param(power_save, bint, 0644);
 MODULE_PARM_DESC(power_save,
 		 "Automatic power-saving timeout (in seconds, 0 = disable).");
 #else
 #define power_save	0
 #endif

 static const struct hda_controller_ops hda_tegra_ops; /* nothing special */

 static void hda_tegra_init(struct hda_tegra *hda)
 {
 	u32 v;

 	/* Enable PCI access */
 	v = readl(hda->regs + HDA_IPFS_CONFIG);
 	v |= HDA_IPFS_EN_FPCI;
 	writel(v, hda->regs + HDA_IPFS_CONFIG);

 	/* Enable MEM/IO space and bus master */
 	v = readl(hda->regs + HDA_CFG_CMD);
 	v &= ~HDA_DISABLE_INTR;
 	v |= HDA_ENABLE_MEM_SPACE | HDA_ENABLE_IO_SPACE |
 		HDA_ENABLE_BUS_MASTER | HDA_ENABLE_SERR;
 	writel(v, hda->regs + HDA_CFG_CMD);

 	writel(HDA_BAR0_INIT_PROGRAM, hda->regs + HDA_CFG_BAR0);
 	writel(HDA_BAR0_FINAL_PROGRAM, hda->regs + HDA_CFG_BAR0);
 	writel(HDA_FPCI_BAR0_START, hda->regs + HDA_IPFS_FPCI_BAR0);

 	v = readl(hda->regs + HDA_IPFS_INTR_MASK);
 	v |= HDA_IPFS_EN_INTR;
 	writel(v, hda->regs + HDA_IPFS_INTR_MASK);
 }

 static int hda_tegra_enable_clocks(struct hda_tegra *data)
 {
 	int rc;

 	rc = clk_prepare_enable(data->hda_clk);
 	if (rc)
 		return rc;
 	rc = clk_prepare_enable(data->hda2codec_2x_clk);
 	if (rc)
 		goto disable_hda;
 	rc = clk_prepare_enable(data->hda2hdmi_clk);
 	if (rc)
 		goto disable_codec_2x;

 	return 0;

 disable_codec_2x:
 	clk_disable_unprepare(data->hda2codec_2x_clk);
 disable_hda:
 	clk_disable_unprepare(data->hda_clk);
 	return rc;
 }

 static void hda_tegra_disable_clocks(struct hda_tegra *data)
 {
 	clk_disable_unprepare(data->hda2hdmi_clk);
 	clk_disable_unprepare(data->hda2codec_2x_clk);
 	clk_disable_unprepare(data->hda_clk);
 }

 /*
  * power management
  */
 static int __maybe_unused hda_tegra_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	int rc;

 	rc = pm_runtime_force_suspend(dev);
 	if (rc < 0)
 		return rc;
 	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

 	return 0;
 }

 static int __maybe_unused hda_tegra_resume(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	int rc;

 	rc = pm_runtime_force_resume(dev);
 	if (rc < 0)
 		return rc;
 	snd_power_change_state(card, SNDRV_CTL_POWER_D0);

 	return 0;
 }

 static int __maybe_unused hda_tegra_runtime_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip = card->private_data;
 	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 	struct hdac_bus *bus = azx_bus(chip);

 	if (chip && chip->running) {
 		azx_stop_chip(chip);
 		synchronize_irq(bus->irq);
 		azx_enter_link_reset(chip);
 	}
 	hda_tegra_disable_clocks(hda);

 	return 0;
 }

 static int __maybe_unused hda_tegra_runtime_resume(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip = card->private_data;
 	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 	int rc;

 	rc = hda_tegra_enable_clocks(hda);
 	if (rc != 0)
 		return rc;
 	if (chip && chip->running) {
 		hda_tegra_init(hda);
 		azx_init_chip(chip, 1);
 	}

 	return 0;
 }

 static const struct dev_pm_ops hda_tegra_pm = {
 	SET_SYSTEM_SLEEP_PM_OPS(hda_tegra_suspend, hda_tegra_resume)
 	SET_RUNTIME_PM_OPS(hda_tegra_runtime_suspend,
 			   hda_tegra_runtime_resume,
 			   NULL)
 };

 static int hda_tegra_dev_disconnect(struct snd_device *device)
 {
 	struct azx *chip = device->device_data;

 	chip->bus.shutdown = 1;
 	return 0;
 }

 /*
  * destructor
  */
 static int hda_tegra_dev_free(struct snd_device *device)
 {
 	struct azx *chip = device->device_data;
 	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);

 	cancel_work_sync(&hda->probe_work);
 	if (azx_bus(chip)->chip_init) {
 		azx_stop_all_streams(chip);
 		azx_stop_chip(chip);
 	}

 	azx_free_stream_pages(chip);
 	azx_free_streams(chip);
 	snd_hdac_bus_exit(azx_bus(chip));

 	return 0;
 }

 static int hda_tegra_init_chip(struct azx *chip, struct platform_device *pdev)
 {
 	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
 	struct hdac_bus *bus = azx_bus(chip);
 	struct device *dev = hda->dev;
 	struct resource *res;

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

 	bus->remap_addr = hda->regs + HDA_BAR0;
 	bus->addr = res->start + HDA_BAR0;

 	hda_tegra_init(hda);

 	return 0;
 }

 static int hda_tegra_init_clk(struct hda_tegra *hda)
 {
 	struct device *dev = hda->dev;

 	hda->hda_clk = devm_clk_get(dev, "hda");
 	if (IS_ERR(hda->hda_clk)) {
 		dev_err(dev, "failed to get hda clock\n");
 		return PTR_ERR(hda->hda_clk);
 	}
 	hda->hda2codec_2x_clk = devm_clk_get(dev, "hda2codec_2x");
 	if (IS_ERR(hda->hda2codec_2x_clk)) {
 		dev_err(dev, "failed to get hda2codec_2x clock\n");
 		return PTR_ERR(hda->hda2codec_2x_clk);
 	}
 	hda->hda2hdmi_clk = devm_clk_get(dev, "hda2hdmi");
 	if (IS_ERR(hda->hda2hdmi_clk)) {
 		dev_err(dev, "failed to get hda2hdmi clock\n");
 		return PTR_ERR(hda->hda2hdmi_clk);
 	}

 	return 0;
 }

 static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev)
 {
 	struct hdac_bus *bus = azx_bus(chip);
 	struct snd_card *card = chip->card;
 	int err;
 	unsigned short gcap;
 	int irq_id = platform_get_irq(pdev, 0);
 	const char *sname, *drv_name = "tegra-hda";
 	struct device_node *np = pdev->dev.of_node;

 	err = hda_tegra_init_chip(chip, pdev);
 	if (err)
 		return err;

 	err = devm_request_irq(chip->card->dev, irq_id, azx_interrupt,
 			     IRQF_SHARED, KBUILD_MODNAME, chip);
 	if (err) {
 		dev_err(chip->card->dev,
 			"unable to request IRQ %d, disabling device\n",
 			irq_id);
 		return err;
 	}
 	bus->irq = irq_id;

 	synchronize_irq(bus->irq);

 	gcap = azx_readw(chip, GCAP);
 	dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);

 	/* read number of streams from GCAP register instead of using
 	 * hardcoded value
 	 */
 	chip->capture_streams = (gcap >> 8) & 0x0f;
 	chip->playback_streams = (gcap >> 12) & 0x0f;
 	if (!chip->playback_streams && !chip->capture_streams) {
 		/* gcap didn't give any info, switching to old method */
 		chip->playback_streams = NUM_PLAYBACK_SD;
 		chip->capture_streams = NUM_CAPTURE_SD;
 	}
 	chip->capture_index_offset = 0;
 	chip->playback_index_offset = chip->capture_streams;
 	chip->num_streams = chip->playback_streams + chip->capture_streams;

 	/* initialize streams */
 	err = azx_init_streams(chip);
 	if (err < 0) {
 		dev_err(card->dev, "failed to initialize streams: %d\n", err);
 		return err;
 	}

 	err = azx_alloc_stream_pages(chip);
 	if (err < 0) {
 		dev_err(card->dev, "failed to allocate stream pages: %d\n",
 			err);
 		return err;
 	}

 	/* initialize chip */
 	azx_init_chip(chip, 1);

 	/* codec detection */
 	if (!bus->codec_mask) {
 		dev_err(card->dev, "no codecs found!\n");
 		return -ENODEV;
 	}

 	/* driver name */
 	strncpy(card->driver, drv_name, sizeof(card->driver));
 	/* shortname for card */
 	sname = of_get_property(np, "nvidia,model", NULL);
 	if (!sname)
 		sname = drv_name;
 	if (strlen(sname) > sizeof(card->shortname))
 		dev_info(card->dev, "truncating shortname for card\n");
 	strncpy(card->shortname, sname, sizeof(card->shortname));

 	/* longname for card */
 	snprintf(card->longname, sizeof(card->longname),
 		 "%s at 0x%lx irq %i",
 		 card->shortname, bus->addr, bus->irq);

 	return 0;
 }

 /*
  * constructor
  */

 static void hda_tegra_probe_work(struct work_struct *work);

 static int hda_tegra_create(struct snd_card *card,
 			    unsigned int driver_caps,
 			    struct hda_tegra *hda)
 {
 	static struct snd_device_ops ops = {
 		.dev_disconnect = hda_tegra_dev_disconnect,
 		.dev_free = hda_tegra_dev_free,
 	};
 	struct azx *chip;
 	int err;

 	chip = &hda->chip;

 	mutex_init(&chip->open_mutex);
 	chip->card = card;
 	chip->ops = &hda_tegra_ops;
 	chip->driver_caps = driver_caps;
 	chip->driver_type = driver_caps & 0xff;
 	chip->dev_index = 0;
 	INIT_LIST_HEAD(&chip->pcm_list);

 	chip->codec_probe_mask = -1;

 	chip->single_cmd = false;
 	chip->snoop = true;

 	INIT_WORK(&hda->probe_work, hda_tegra_probe_work);

 	err = azx_bus_init(chip, NULL);
 	if (err < 0)
 		return err;

 	chip->bus.needs_damn_long_delay = 1;

 	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 	if (err < 0) {
 		dev_err(card->dev, "Error creating device\n");
 		return err;
 	}

 	return 0;
 }

 static const struct of_device_id hda_tegra_match[] = {
 	{ .compatible = "nvidia,tegra30-hda" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, hda_tegra_match);

 static int hda_tegra_probe(struct platform_device *pdev)
 {
 	const unsigned int driver_flags = AZX_DCAPS_CORBRP_SELF_CLEAR |
 					  AZX_DCAPS_PM_RUNTIME;
 	struct snd_card *card;
 	struct azx *chip;
 	struct hda_tegra *hda;
 	int err;

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

 	err = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 			   THIS_MODULE, 0, &card);
 	if (err < 0) {
 		dev_err(&pdev->dev, "Error creating card!\n");
 		return err;
 	}

 	err = hda_tegra_init_clk(hda);
 	if (err < 0)
 		goto out_free;

 	err = hda_tegra_create(card, driver_flags, hda);
 	if (err < 0)
 		goto out_free;
 	card->private_data = chip;

 	dev_set_drvdata(&pdev->dev, card);

 	pm_runtime_enable(hda->dev);
 	if (!azx_has_pm_runtime(chip))
 		pm_runtime_forbid(hda->dev);

 	schedule_work(&hda->probe_work);

 	return 0;

 out_free:
 	snd_card_free(card);
 	return err;
 }

 static void hda_tegra_probe_work(struct work_struct *work)
 {
 	struct hda_tegra *hda = container_of(work, struct hda_tegra, probe_work);
 	struct azx *chip = &hda->chip;
 	struct platform_device *pdev = to_platform_device(hda->dev);
 	int err;

 	pm_runtime_get_sync(hda->dev);
 	err = hda_tegra_first_init(chip, pdev);
 	if (err < 0)
 		goto out_free;

 	/* create codec instances */
 	err = azx_probe_codecs(chip, 8);
 	if (err < 0)
 		goto out_free;

 	err = azx_codec_configure(chip);
 	if (err < 0)
 		goto out_free;

 	err = snd_card_register(chip->card);
 	if (err < 0)
 		goto out_free;

 	chip->running = 1;
 	snd_hda_set_power_save(&chip->bus, power_save * 1000);

  out_free:
 	pm_runtime_put(hda->dev);
 	return; /* no error return from async probe */
 }

 static int hda_tegra_remove(struct platform_device *pdev)
 {
 	int ret;

 	ret = snd_card_free(dev_get_drvdata(&pdev->dev));
 	pm_runtime_disable(&pdev->dev);

 	return ret;
 }

 static void hda_tegra_shutdown(struct platform_device *pdev)
 {
 	struct snd_card *card = dev_get_drvdata(&pdev->dev);
 	struct azx *chip;

 	if (!card)
 		return;
 	chip = card->private_data;
 	if (chip && chip->running)
 		azx_stop_chip(chip);
 }

 static struct platform_driver tegra_platform_hda = {
 	.driver = {
 		.name = "tegra-hda",
 		.pm = &hda_tegra_pm,
 		.of_match_table = hda_tegra_match,
 	},
 	.probe = hda_tegra_probe,
 	.remove = hda_tegra_remove,
 	.shutdown = hda_tegra_shutdown,
 };
 module_platform_driver(tegra_platform_hda);

 MODULE_DESCRIPTION("Tegra HDA bus driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	*
	* Implementation of primary ALSA driver code base for NVIDIA Tegra HDA.
	*/

	#include <linux/clk.h>
	#include <linux/clocksource.h>
	#include <linux/completion.h>
	#include <linux/delay.h>
	#include <linux/dma-mapping.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/mutex.h>
	#include <linux/of_device.h>
	#include <linux/slab.h>
	#include <linux/time.h>
	#include <linux/string.h>
	#include <linux/pm_runtime.h>

	#include <sound/core.h>
	#include <sound/initval.h>

	#include <sound/hda_codec.h>
	#include "hda_controller.h"

	/* Defines for Nvidia Tegra HDA support */
	#define HDA_BAR0 0x8000

	#define HDA_CFG_CMD 0x1004
	#define HDA_CFG_BAR0 0x1010

	#define HDA_ENABLE_IO_SPACE (1 << 0)
	#define HDA_ENABLE_MEM_SPACE (1 << 1)
	#define HDA_ENABLE_BUS_MASTER (1 << 2)
	#define HDA_ENABLE_SERR (1 << 8)
	#define HDA_DISABLE_INTR (1 << 10)
	#define HDA_BAR0_INIT_PROGRAM 0xFFFFFFFF
	#define HDA_BAR0_FINAL_PROGRAM (1 << 14)

	/* IPFS */
	#define HDA_IPFS_CONFIG 0x180
	#define HDA_IPFS_EN_FPCI 0x1

	#define HDA_IPFS_FPCI_BAR0 0x80
	#define HDA_FPCI_BAR0_START 0x40

	#define HDA_IPFS_INTR_MASK 0x188
	#define HDA_IPFS_EN_INTR (1 << 16)

	/* max number of SDs */
	#define NUM_CAPTURE_SD 1
	#define NUM_PLAYBACK_SD 1

	struct hda_tegra {
	struct azx chip;
	struct device *dev;
	struct clk *hda_clk;
	struct clk *hda2codec_2x_clk;
	struct clk *hda2hdmi_clk;
	void __iomem *regs;
	struct work_struct probe_work;
	};

	#ifdef CONFIG_PM
	static int power_save = CONFIG_SND_HDA_POWER_SAVE_DEFAULT;
	module_param(power_save, bint, 0644);
	MODULE_PARM_DESC(power_save,
	"Automatic power-saving timeout (in seconds, 0 = disable).");
	#else
	#define power_save 0
	#endif

	static const struct hda_controller_ops hda_tegra_ops; /* nothing special */

	static void hda_tegra_init(struct hda_tegra *hda)
	{
	u32 v;

	/* Enable PCI access */
	v = readl(hda->regs + HDA_IPFS_CONFIG);
	v \|= HDA_IPFS_EN_FPCI;
	writel(v, hda->regs + HDA_IPFS_CONFIG);

	/* Enable MEM/IO space and bus master */
	v = readl(hda->regs + HDA_CFG_CMD);
	v &= ~HDA_DISABLE_INTR;
	v \|= HDA_ENABLE_MEM_SPACE \| HDA_ENABLE_IO_SPACE \|
	HDA_ENABLE_BUS_MASTER \| HDA_ENABLE_SERR;
	writel(v, hda->regs + HDA_CFG_CMD);

	writel(HDA_BAR0_INIT_PROGRAM, hda->regs + HDA_CFG_BAR0);
	writel(HDA_BAR0_FINAL_PROGRAM, hda->regs + HDA_CFG_BAR0);
	writel(HDA_FPCI_BAR0_START, hda->regs + HDA_IPFS_FPCI_BAR0);

	v = readl(hda->regs + HDA_IPFS_INTR_MASK);
	v \|= HDA_IPFS_EN_INTR;
	writel(v, hda->regs + HDA_IPFS_INTR_MASK);
	}

	static int hda_tegra_enable_clocks(struct hda_tegra *data)
	{
	int rc;

	rc = clk_prepare_enable(data->hda_clk);
	if (rc)
	return rc;
	rc = clk_prepare_enable(data->hda2codec_2x_clk);
	if (rc)
	goto disable_hda;
	rc = clk_prepare_enable(data->hda2hdmi_clk);
	if (rc)
	goto disable_codec_2x;

	return 0;

	disable_codec_2x:
	clk_disable_unprepare(data->hda2codec_2x_clk);
	disable_hda:
	clk_disable_unprepare(data->hda_clk);
	return rc;
	}

	static void hda_tegra_disable_clocks(struct hda_tegra *data)
	{
	clk_disable_unprepare(data->hda2hdmi_clk);
	clk_disable_unprepare(data->hda2codec_2x_clk);
	clk_disable_unprepare(data->hda_clk);
	}

	/*
	* power management
	*/
	static int __maybe_unused hda_tegra_suspend(struct device *dev)
	{
	struct snd_card *card = dev_get_drvdata(dev);
	int rc;

	rc = pm_runtime_force_suspend(dev);
	if (rc < 0)
	return rc;
	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

	return 0;
	}

	static int __maybe_unused hda_tegra_resume(struct device *dev)
	{
	struct snd_card *card = dev_get_drvdata(dev);
	int rc;

	rc = pm_runtime_force_resume(dev);
	if (rc < 0)
	return rc;
	snd_power_change_state(card, SNDRV_CTL_POWER_D0);

	return 0;
	}

	static int __maybe_unused hda_tegra_runtime_suspend(struct device *dev)
	{
	struct snd_card *card = dev_get_drvdata(dev);
	struct azx *chip = card->private_data;
	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
	struct hdac_bus *bus = azx_bus(chip);

	if (chip && chip->running) {
	azx_stop_chip(chip);
	synchronize_irq(bus->irq);
	azx_enter_link_reset(chip);
	}
	hda_tegra_disable_clocks(hda);

	return 0;
	}

	static int __maybe_unused hda_tegra_runtime_resume(struct device *dev)
	{
	struct snd_card *card = dev_get_drvdata(dev);
	struct azx *chip = card->private_data;
	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
	int rc;

	rc = hda_tegra_enable_clocks(hda);
	if (rc != 0)
	return rc;
	if (chip && chip->running) {
	hda_tegra_init(hda);
	azx_init_chip(chip, 1);
	}

	return 0;
	}

	static const struct dev_pm_ops hda_tegra_pm = {
	SET_SYSTEM_SLEEP_PM_OPS(hda_tegra_suspend, hda_tegra_resume)
	SET_RUNTIME_PM_OPS(hda_tegra_runtime_suspend,
	hda_tegra_runtime_resume,
	NULL)
	};

	static int hda_tegra_dev_disconnect(struct snd_device *device)
	{
	struct azx *chip = device->device_data;

	chip->bus.shutdown = 1;
	return 0;
	}

	/*
	* destructor
	*/
	static int hda_tegra_dev_free(struct snd_device *device)
	{
	struct azx *chip = device->device_data;
	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);

	cancel_work_sync(&hda->probe_work);
	if (azx_bus(chip)->chip_init) {
	azx_stop_all_streams(chip);
	azx_stop_chip(chip);
	}

	azx_free_stream_pages(chip);
	azx_free_streams(chip);
	snd_hdac_bus_exit(azx_bus(chip));

	return 0;
	}

	static int hda_tegra_init_chip(struct azx chip, struct platform_device pdev)
	{
	struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip);
	struct hdac_bus *bus = azx_bus(chip);
	struct device *dev = hda->dev;
	struct resource *res;

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

	bus->remap_addr = hda->regs + HDA_BAR0;
	bus->addr = res->start + HDA_BAR0;

	hda_tegra_init(hda);

	return 0;
	}

	static int hda_tegra_init_clk(struct hda_tegra *hda)
	{
	struct device *dev = hda->dev;

	hda->hda_clk = devm_clk_get(dev, "hda");
	if (IS_ERR(hda->hda_clk)) {
	dev_err(dev, "failed to get hda clock\n");
	return PTR_ERR(hda->hda_clk);
	}
	hda->hda2codec_2x_clk = devm_clk_get(dev, "hda2codec_2x");
	if (IS_ERR(hda->hda2codec_2x_clk)) {
	dev_err(dev, "failed to get hda2codec_2x clock\n");
	return PTR_ERR(hda->hda2codec_2x_clk);
	}
	hda->hda2hdmi_clk = devm_clk_get(dev, "hda2hdmi");
	if (IS_ERR(hda->hda2hdmi_clk)) {
	dev_err(dev, "failed to get hda2hdmi clock\n");
	return PTR_ERR(hda->hda2hdmi_clk);
	}

	return 0;
	}

	static int hda_tegra_first_init(struct azx chip, struct platform_device pdev)
	{
	struct hdac_bus *bus = azx_bus(chip);
	struct snd_card *card = chip->card;
	int err;
	unsigned short gcap;
	int irq_id = platform_get_irq(pdev, 0);
	const char sname, drv_name = "tegra-hda";
	struct device_node *np = pdev->dev.of_node;

	err = hda_tegra_init_chip(chip, pdev);
	if (err)
	return err;

	err = devm_request_irq(chip->card->dev, irq_id, azx_interrupt,
	IRQF_SHARED, KBUILD_MODNAME, chip);
	if (err) {
	dev_err(chip->card->dev,
	"unable to request IRQ %d, disabling device\n",
	irq_id);
	return err;
	}
	bus->irq = irq_id;

	synchronize_irq(bus->irq);

	gcap = azx_readw(chip, GCAP);
	dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);

	/* read number of streams from GCAP register instead of using
	* hardcoded value
	*/
	chip->capture_streams = (gcap >> 8) & 0x0f;
	chip->playback_streams = (gcap >> 12) & 0x0f;
	if (!chip->playback_streams && !chip->capture_streams) {
	/* gcap didn't give any info, switching to old method */
	chip->playback_streams = NUM_PLAYBACK_SD;
	chip->capture_streams = NUM_CAPTURE_SD;
	}
	chip->capture_index_offset = 0;
	chip->playback_index_offset = chip->capture_streams;
	chip->num_streams = chip->playback_streams + chip->capture_streams;

	/* initialize streams */
	err = azx_init_streams(chip);
	if (err < 0) {
	dev_err(card->dev, "failed to initialize streams: %d\n", err);
	return err;
	}

	err = azx_alloc_stream_pages(chip);
	if (err < 0) {
	dev_err(card->dev, "failed to allocate stream pages: %d\n",
	err);
	return err;
	}

	/* initialize chip */
	azx_init_chip(chip, 1);

	/* codec detection */
	if (!bus->codec_mask) {
	dev_err(card->dev, "no codecs found!\n");
	return -ENODEV;
	}

	/* driver name */
	strncpy(card->driver, drv_name, sizeof(card->driver));
	/* shortname for card */
	sname = of_get_property(np, "nvidia,model", NULL);
	if (!sname)
	sname = drv_name;
	if (strlen(sname) > sizeof(card->shortname))
	dev_info(card->dev, "truncating shortname for card\n");
	strncpy(card->shortname, sname, sizeof(card->shortname));

	/* longname for card */
	snprintf(card->longname, sizeof(card->longname),
	"%s at 0x%lx irq %i",
	card->shortname, bus->addr, bus->irq);

	return 0;
	}

	/*
	* constructor
	*/

	static void hda_tegra_probe_work(struct work_struct *work);

	static int hda_tegra_create(struct snd_card *card,
	unsigned int driver_caps,
	struct hda_tegra *hda)
	{
	static struct snd_device_ops ops = {
	.dev_disconnect = hda_tegra_dev_disconnect,
	.dev_free = hda_tegra_dev_free,
	};
	struct azx *chip;
	int err;

	chip = &hda->chip;

	mutex_init(&chip->open_mutex);
	chip->card = card;
	chip->ops = &hda_tegra_ops;
	chip->driver_caps = driver_caps;
	chip->driver_type = driver_caps & 0xff;
	chip->dev_index = 0;
	INIT_LIST_HEAD(&chip->pcm_list);

	chip->codec_probe_mask = -1;

	chip->single_cmd = false;
	chip->snoop = true;

	INIT_WORK(&hda->probe_work, hda_tegra_probe_work);

	err = azx_bus_init(chip, NULL);
	if (err < 0)
	return err;

	chip->bus.needs_damn_long_delay = 1;

	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
	if (err < 0) {
	dev_err(card->dev, "Error creating device\n");
	return err;
	}

	return 0;
	}

	static const struct of_device_id hda_tegra_match[] = {
	{ .compatible = "nvidia,tegra30-hda" },
	{},
	};
	MODULE_DEVICE_TABLE(of, hda_tegra_match);

	static int hda_tegra_probe(struct platform_device *pdev)
	{
	const unsigned int driver_flags = AZX_DCAPS_CORBRP_SELF_CLEAR \|
	AZX_DCAPS_PM_RUNTIME;
	struct snd_card *card;
	struct azx *chip;
	struct hda_tegra *hda;
	int err;

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

	err = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
	THIS_MODULE, 0, &card);
	if (err < 0) {
	dev_err(&pdev->dev, "Error creating card!\n");
	return err;
	}

	err = hda_tegra_init_clk(hda);
	if (err < 0)
	goto out_free;

	err = hda_tegra_create(card, driver_flags, hda);
	if (err < 0)
	goto out_free;
	card->private_data = chip;

	dev_set_drvdata(&pdev->dev, card);

	pm_runtime_enable(hda->dev);
	if (!azx_has_pm_runtime(chip))
	pm_runtime_forbid(hda->dev);

	schedule_work(&hda->probe_work);

	return 0;

	out_free:
	snd_card_free(card);
	return err;
	}

	static void hda_tegra_probe_work(struct work_struct *work)
	{
	struct hda_tegra *hda = container_of(work, struct hda_tegra, probe_work);
	struct azx *chip = &hda->chip;
	struct platform_device *pdev = to_platform_device(hda->dev);
	int err;

	pm_runtime_get_sync(hda->dev);
	err = hda_tegra_first_init(chip, pdev);
	if (err < 0)
	goto out_free;

	/* create codec instances */
	err = azx_probe_codecs(chip, 8);
	if (err < 0)
	goto out_free;

	err = azx_codec_configure(chip);
	if (err < 0)
	goto out_free;

	err = snd_card_register(chip->card);
	if (err < 0)
	goto out_free;

	chip->running = 1;
	snd_hda_set_power_save(&chip->bus, power_save * 1000);

	out_free:
	pm_runtime_put(hda->dev);
	return; /* no error return from async probe */
	}

	static int hda_tegra_remove(struct platform_device *pdev)
	{
	int ret;

	ret = snd_card_free(dev_get_drvdata(&pdev->dev));
	pm_runtime_disable(&pdev->dev);

	return ret;
	}

	static void hda_tegra_shutdown(struct platform_device *pdev)
	{
	struct snd_card *card = dev_get_drvdata(&pdev->dev);
	struct azx *chip;

	if (!card)
	return;
	chip = card->private_data;
	if (chip && chip->running)
	azx_stop_chip(chip);
	}

	static struct platform_driver tegra_platform_hda = {
	.driver = {
	.name = "tegra-hda",
	.pm = &hda_tegra_pm,
	.of_match_table = hda_tegra_match,
	},
	.probe = hda_tegra_probe,
	.remove = hda_tegra_remove,
	.shutdown = hda_tegra_shutdown,
	};
	module_platform_driver(tegra_platform_hda);

	MODULE_DESCRIPTION("Tegra HDA bus driver");
	MODULE_LICENSE("GPL v2");