// 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.h>
#include <linux/platform_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 0 x8000
#define HDA_CFG_CMD 0 x1004
#define HDA_CFG_BAR0 0 x1010
#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 0 xFFFFFFFF
#define HDA_BAR0_FINAL_PROGRAM (1 << 14 )
/* IPFS */
#define HDA_IPFS_CONFIG 0 x180
#define HDA_IPFS_EN_FPCI 0 x1
#define HDA_IPFS_FPCI_BAR0 0 x80
#define HDA_FPCI_BAR0_START 0 x40
#define HDA_IPFS_INTR_MASK 0 x188
#define HDA_IPFS_EN_INTR (1 << 16 )
/* FPCI */
#define FPCI_DBG_CFG_2 0 x10F4
#define FPCI_GCAP_NSDO_SHIFT 18
#define FPCI_GCAP_NSDO_MASK (0 x3 << 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_soc {
bool has_hda2codec_2x_reset;
bool has_hda2hdmi;
bool has_hda2codec_2x;
bool input_stream;
bool always_on;
bool requires_init;
};
struct hda_tegra {
struct azx chip;
struct device *dev;
struct reset_control_bulk_data resets[3 ];
struct clk_bulk_data clocks[3 ];
unsigned int nresets;
unsigned int nclocks;
void __iomem *regs;
struct work_struct probe_work;
const struct hda_tegra_soc *soc;
};
#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 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 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 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 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_bulk_assert(hda->nresets, hda->resets);
if (rc)
return rc;
}
rc = clk_bulk_prepare_enable(hda->nclocks, hda->clocks);
if (rc != 0 )
return rc;
if (chip->running) {
if (hda->soc->requires_init)
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_bulk_deassert(hda->nresets, hda->resets);
if (rc)
return rc;
}
return 0 ;
}
static const struct dev_pm_ops hda_tegra_pm = {
SYSTEM_SLEEP_PM_OPS(hda_tegra_suspend, hda_tegra_resume)
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 resource *res;
hda->regs = devm_platform_get_and_ioremap_resource(pdev, 0 , &res);
if (IS_ERR(hda->regs))
return PTR_ERR(hda->regs);
bus->remap_addr = hda->regs + HDA_BAR0;
bus->addr = res->start + HDA_BAR0;
if (hda->soc->requires_init)
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 ) & 0 x0f;
/* The GCAP register on Tegra234 implies no Input Streams(ISS) support,
* but the HW output stream descriptor programming should start with
* offset 0 x20 * 4 from base stream descriptor address . This will be a
* problem while calculating the offset for output stream descriptor
* which will be considering input stream also . So here output stream
* starts with offset 0 which is wrong as HW register for output stream
* offset starts with 4 .
*/
if (!hda->soc->input_stream)
chip->capture_streams = 4 ;
chip->playback_streams = (gcap >> 12 ) & 0 x0f;
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 . 1 K / 48 K , 2 - channel , 16 - bps ) fails with
* 4 SDO lines due to legacy design limitation . Following
* is , from HD Audio Specification ( Revision 1 . 0 a ) , used to
* control striping of the stream across multiple SDO lines
* for sample rates < = 48 K .
*
* { ( ( 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 */
strscpy(card->driver, drv_name);
/* 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" );
strscpy(card->shortname, sname);
/* 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 & 0 xff;
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 ;
/*
* HDA power domain and clocks are always on for Tegra264 and
* the jack detection logic would work always , so no need of
* jack polling mechanism running .
*/
if (!hda->soc->always_on) {
chip->jackpoll_interval = msecs_to_jiffies(5000 );
chip->bus.jackpoll_in_suspend = 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 hda_tegra_soc tegra30_data = {
.has_hda2codec_2x_reset = true ,
.has_hda2hdmi = true ,
.has_hda2codec_2x = true ,
.input_stream = true ,
.always_on = false ,
.requires_init = true ,
};
static const struct hda_tegra_soc tegra194_data = {
.has_hda2codec_2x_reset = false ,
.has_hda2hdmi = true ,
.has_hda2codec_2x = true ,
.input_stream = true ,
.always_on = false ,
.requires_init = true ,
};
static const struct hda_tegra_soc tegra234_data = {
.has_hda2codec_2x_reset = true ,
.has_hda2hdmi = false ,
.has_hda2codec_2x = true ,
.input_stream = false ,
.always_on = false ,
.requires_init = true ,
};
static const struct hda_tegra_soc tegra264_data = {
.has_hda2codec_2x_reset = true ,
.has_hda2hdmi = false ,
.has_hda2codec_2x = false ,
.input_stream = false ,
.always_on = true ,
.requires_init = false ,
};
static const struct of_device_id hda_tegra_match[] = {
{ .compatible = "nvidia,tegra30-hda" , .data = &tegra30_data },
{ .compatible = "nvidia,tegra194-hda" , .data = &tegra194_data },
{ .compatible = "nvidia,tegra234-hda" , .data = &tegra234_data },
{ .compatible = "nvidia,tegra264-hda" , .data = &tegra264_data },
{},
};
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;
hda->soc = of_device_get_match_data(&pdev->dev);
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->resets[hda->nresets++].id = "hda" ;
/*
* " hda2hdmi " is not applicable for Tegra234 . This is because the
* codec is separate IP and not under display SOR partition now .
*/
if (hda->soc->has_hda2hdmi)
hda->resets[hda->nresets++].id = "hda2hdmi" ;
/*
* " hda2codec_2x " reset is not present on Tegra194 . Though DT would
* be updated to reflect this , but to have backward compatibility
* below is necessary .
*/
if (hda->soc->has_hda2codec_2x_reset)
hda->resets[hda->nresets++].id = "hda2codec_2x" ;
err = devm_reset_control_bulk_get_exclusive(&pdev->dev, hda->nresets,
hda->resets);
if (err)
goto out_free;
hda->clocks[hda->nclocks++].id = "hda" ;
if (hda->soc->has_hda2hdmi)
hda->clocks[hda->nclocks++].id = "hda2hdmi" ;
if (hda->soc->has_hda2codec_2x)
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 void hda_tegra_remove(struct platform_device *pdev)
{
snd_card_free(dev_get_drvdata(&pdev->dev));
pm_runtime_disable(&pdev->dev);
}
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 = pm_ptr(&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" );
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