1 files changed, 564 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
new file mode 100644
index 000000000..17b06f7b6
--- /dev/null
+++ b/sound/pci/hda/hda_tegra.c
@@ -0,0 +1,564 @@
+// 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/reset.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)
+
+/* FPCI */
+#define FPCI_DBG_CFG_2		  0x10F4
+#define FPCI_GCAP_NSDO_SHIFT	  18
+#define FPCI_GCAP_NSDO_MASK	  (0x3 << FPCI_GCAP_NSDO_SHIFT)
+
+/* max number of SDs */
+#define NUM_CAPTURE_SD 1
+#define NUM_PLAYBACK_SD 1
+
+/*
+ * Tegra194 does not reflect correct number of SDO lines. Below macro
+ * is used to update the GCAP register to workaround the issue.
+ */
+#define TEGRA194_NUM_SDO_LINES	  4
+
+struct hda_tegra {
+	struct azx chip;
+	struct device *dev;
+	struct reset_control *reset;
+	struct clk_bulk_data clocks[3];
+	unsigned int nclocks;
+	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);
+}
+
+/*
+ * 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);
+
+	if (chip && chip->running) {
+		/* enable controller wake up event */
+		azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
+			   STATESTS_INT_MASK);
+
+		azx_stop_chip(chip);
+		azx_enter_link_reset(chip);
+	}
+	clk_bulk_disable_unprepare(hda->nclocks, hda->clocks);
+
+	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;
+
+	if (!chip->running) {
+		rc = reset_control_assert(hda->reset);
+		if (rc)
+			return rc;
+	}
+
+	rc = clk_bulk_prepare_enable(hda->nclocks, hda->clocks);
+	if (rc != 0)
+		return rc;
+	if (chip && chip->running) {
+		hda_tegra_init(hda);
+		azx_init_chip(chip, 1);
+		/* disable controller wake up event*/
+		azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) &
+			   ~STATESTS_INT_MASK);
+	} else {
+		usleep_range(10, 100);
+
+		rc = reset_control_deassert(hda->reset);
+		if (rc)
+			return rc;
+	}
+
+	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_first_init(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 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;
+
+	if (irq_id < 0)
+		return irq_id;
+
+	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;
+	bus->dma_stop_delay = 100;
+	card->sync_irq = bus->irq;
+
+	/*
+	 * Tegra194 has 4 SDO lines and the STRIPE can be used to
+	 * indicate how many of the SDO lines the stream should be
+	 * striped. But GCAP register does not reflect the true
+	 * capability of HW. Below workaround helps to fix this.
+	 *
+	 * GCAP_NSDO is bits 19:18 in T_AZA_DBG_CFG_2,
+	 * 0 for 1 SDO, 1 for 2 SDO, 2 for 4 SDO lines.
+	 */
+	if (of_device_is_compatible(np, "nvidia,tegra194-hda")) {
+		u32 val;
+
+		dev_info(card->dev, "Override SDO lines to %u\n",
+			 TEGRA194_NUM_SDO_LINES);
+
+		val = readl(hda->regs + FPCI_DBG_CFG_2) & ~FPCI_GCAP_NSDO_MASK;
+		val |= (TEGRA194_NUM_SDO_LINES >> 1) << FPCI_GCAP_NSDO_SHIFT;
+		writel(val, hda->regs + FPCI_DBG_CFG_2);
+	}
+
+	gcap = azx_readw(chip, GCAP);
+	dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);
+
+	chip->align_buffer_size = 1;
+
+	/* 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);
+
+	/*
+	 * Playback (for 44.1K/48K, 2-channel, 16-bps) fails with
+	 * 4 SDO lines due to legacy design limitation. Following
+	 * is, from HD Audio Specification (Revision 1.0a), used to
+	 * control striping of the stream across multiple SDO lines
+	 * for sample rates <= 48K.
+	 *
+	 * { ((num_channels * bits_per_sample) / number of SDOs) >= 8 }
+	 *
+	 * Due to legacy design issue it is recommended that above
+	 * ratio must be greater than 8. Since number of SDO lines is
+	 * in powers of 2, next available ratio is 16 which can be
+	 * used as a limiting factor here.
+	 */
+	if (of_device_is_compatible(np, "nvidia,tegra30-hda"))
+		chip->bus.core.sdo_limit = 16;
+
+	/* 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 const 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.core.sync_write = 0;
+	chip->bus.core.needs_damn_long_delay = 1;
+	chip->bus.core.aligned_mmio = 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" },
+	{ .compatible = "nvidia,tegra194-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 |
+					  AZX_DCAPS_4K_BDLE_BOUNDARY;
+	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;
+	}
+
+	hda->reset = devm_reset_control_array_get_exclusive(&pdev->dev);
+	if (IS_ERR(hda->reset)) {
+		err = PTR_ERR(hda->reset);
+		goto out_free;
+	}
+
+	hda->clocks[hda->nclocks++].id = "hda";
+	hda->clocks[hda->nclocks++].id = "hda2hdmi";
+	hda->clocks[hda->nclocks++].id = "hda2codec_2x";
+
+	err = devm_clk_bulk_get(&pdev->dev, hda->nclocks, hda->clocks);
+	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");