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linux-sg2042/sound/soc/xtensa/xtfpga-i2s.c

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/*
* Xtfpga I2S controller driver
*
* Copyright (c) 2014 Cadence Design Systems Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#define DRV_NAME "xtfpga-i2s"
#define XTFPGA_I2S_VERSION 0x00
#define XTFPGA_I2S_CONFIG 0x04
#define XTFPGA_I2S_INT_MASK 0x08
#define XTFPGA_I2S_INT_STATUS 0x0c
#define XTFPGA_I2S_CHAN0_DATA 0x10
#define XTFPGA_I2S_CHAN1_DATA 0x14
#define XTFPGA_I2S_CHAN2_DATA 0x18
#define XTFPGA_I2S_CHAN3_DATA 0x1c
#define XTFPGA_I2S_CONFIG_TX_ENABLE 0x1
#define XTFPGA_I2S_CONFIG_INT_ENABLE 0x2
#define XTFPGA_I2S_CONFIG_LEFT 0x4
#define XTFPGA_I2S_CONFIG_RATIO_BASE 8
#define XTFPGA_I2S_CONFIG_RATIO_MASK 0x0000ff00
#define XTFPGA_I2S_CONFIG_RES_BASE 16
#define XTFPGA_I2S_CONFIG_RES_MASK 0x003f0000
#define XTFPGA_I2S_CONFIG_LEVEL_BASE 24
#define XTFPGA_I2S_CONFIG_LEVEL_MASK 0x0f000000
#define XTFPGA_I2S_CONFIG_CHANNEL_BASE 28
#define XTFPGA_I2S_INT_UNDERRUN 0x1
#define XTFPGA_I2S_INT_LEVEL 0x2
#define XTFPGA_I2S_INT_VALID 0x3
#define XTFPGA_I2S_FIFO_SIZE 8192
/*
* I2S controller operation:
*
* Enabling TX: output 1 period of zeros (starting with left channel)
* and then queued data.
*
* Level status and interrupt: whenever FIFO level is below FIFO trigger,
* level status is 1 and an IRQ is asserted (if enabled).
*
* Underrun status and interrupt: whenever FIFO is empty, underrun status
* is 1 and an IRQ is asserted (if enabled).
*/
struct xtfpga_i2s {
struct device *dev;
struct clk *clk;
struct regmap *regmap;
void __iomem *regs;
/* current playback substream. NULL if not playing.
*
* Access to that field is synchronized between the interrupt handler
* and userspace through RCU.
*
* Interrupt handler (threaded part) does PIO on substream data in RCU
* read-side critical section. Trigger callback sets and clears the
* pointer when the playback is started and stopped with
* rcu_assign_pointer. When userspace is about to free the playback
* stream in the pcm_close callback it synchronizes with the interrupt
* handler by means of synchronize_rcu call.
*/
struct snd_pcm_substream *tx_substream;
unsigned (*tx_fn)(struct xtfpga_i2s *i2s,
struct snd_pcm_runtime *runtime,
unsigned tx_ptr);
unsigned tx_ptr; /* next frame index in the sample buffer */
/* current fifo level estimate.
* Doesn't have to be perfectly accurate, but must be not less than
* the actual FIFO level in order to avoid stall on push attempt.
*/
unsigned tx_fifo_level;
/* FIFO level at which level interrupt occurs */
unsigned tx_fifo_low;
/* maximal FIFO level */
unsigned tx_fifo_high;
};
static bool xtfpga_i2s_wr_reg(struct device *dev, unsigned int reg)
{
return reg >= XTFPGA_I2S_CONFIG;
}
static bool xtfpga_i2s_rd_reg(struct device *dev, unsigned int reg)
{
return reg < XTFPGA_I2S_CHAN0_DATA;
}
static bool xtfpga_i2s_volatile_reg(struct device *dev, unsigned int reg)
{
return reg == XTFPGA_I2S_INT_STATUS;
}
static const struct regmap_config xtfpga_i2s_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = XTFPGA_I2S_CHAN3_DATA,
.writeable_reg = xtfpga_i2s_wr_reg,
.readable_reg = xtfpga_i2s_rd_reg,
.volatile_reg = xtfpga_i2s_volatile_reg,
.cache_type = REGCACHE_FLAT,
};
/* Generate functions that do PIO from TX DMA area to FIFO for all supported
* stream formats.
* Functions will be called xtfpga_pcm_tx_<channels>x<sample bits>, e.g.
* xtfpga_pcm_tx_2x16 for 16-bit stereo.
*
* FIFO consists of 32-bit words, one word per channel, always 2 channels.
* If I2S interface is configured with smaller sample resolution, only
* the LSB of each word is used.
*/
#define xtfpga_pcm_tx_fn(channels, sample_bits) \
static unsigned xtfpga_pcm_tx_##channels##x##sample_bits( \
struct xtfpga_i2s *i2s, struct snd_pcm_runtime *runtime, \
unsigned tx_ptr) \
{ \
const u##sample_bits (*p)[channels] = \
(void *)runtime->dma_area; \
\
for (; i2s->tx_fifo_level < i2s->tx_fifo_high; \
i2s->tx_fifo_level += 2) { \
iowrite32(p[tx_ptr][0], \
i2s->regs + XTFPGA_I2S_CHAN0_DATA); \
iowrite32(p[tx_ptr][channels - 1], \
i2s->regs + XTFPGA_I2S_CHAN0_DATA); \
if (++tx_ptr >= runtime->buffer_size) \
tx_ptr = 0; \
} \
return tx_ptr; \
}
xtfpga_pcm_tx_fn(1, 16)
xtfpga_pcm_tx_fn(2, 16)
xtfpga_pcm_tx_fn(1, 32)
xtfpga_pcm_tx_fn(2, 32)
#undef xtfpga_pcm_tx_fn
static bool xtfpga_pcm_push_tx(struct xtfpga_i2s *i2s)
{
struct snd_pcm_substream *tx_substream;
bool tx_active;
rcu_read_lock();
tx_substream = rcu_dereference(i2s->tx_substream);
tx_active = tx_substream && snd_pcm_running(tx_substream);
if (tx_active) {
unsigned tx_ptr = ACCESS_ONCE(i2s->tx_ptr);
unsigned new_tx_ptr = i2s->tx_fn(i2s, tx_substream->runtime,
tx_ptr);
cmpxchg(&i2s->tx_ptr, tx_ptr, new_tx_ptr);
}
rcu_read_unlock();
return tx_active;
}
static void xtfpga_pcm_refill_fifo(struct xtfpga_i2s *i2s)
{
unsigned int_status;
unsigned i;
regmap_read(i2s->regmap, XTFPGA_I2S_INT_STATUS,
&int_status);
for (i = 0; i < 2; ++i) {
bool tx_active = xtfpga_pcm_push_tx(i2s);
regmap_write(i2s->regmap, XTFPGA_I2S_INT_STATUS,
XTFPGA_I2S_INT_VALID);
if (tx_active)
regmap_read(i2s->regmap, XTFPGA_I2S_INT_STATUS,
&int_status);
if (!tx_active ||
!(int_status & XTFPGA_I2S_INT_LEVEL))
break;
/* After the push the level IRQ is still asserted,
* means FIFO level is below tx_fifo_low. Estimate
* it as tx_fifo_low.
*/
i2s->tx_fifo_level = i2s->tx_fifo_low;
}
if (!(int_status & XTFPGA_I2S_INT_LEVEL))
regmap_write(i2s->regmap, XTFPGA_I2S_INT_MASK,
XTFPGA_I2S_INT_VALID);
else if (!(int_status & XTFPGA_I2S_INT_UNDERRUN))
regmap_write(i2s->regmap, XTFPGA_I2S_INT_MASK,
XTFPGA_I2S_INT_UNDERRUN);
if (!(int_status & XTFPGA_I2S_INT_UNDERRUN))
regmap_update_bits(i2s->regmap, XTFPGA_I2S_CONFIG,
XTFPGA_I2S_CONFIG_INT_ENABLE |
XTFPGA_I2S_CONFIG_TX_ENABLE,
XTFPGA_I2S_CONFIG_INT_ENABLE |
XTFPGA_I2S_CONFIG_TX_ENABLE);
else
regmap_update_bits(i2s->regmap, XTFPGA_I2S_CONFIG,
XTFPGA_I2S_CONFIG_INT_ENABLE |
XTFPGA_I2S_CONFIG_TX_ENABLE, 0);
}
static irqreturn_t xtfpga_i2s_threaded_irq_handler(int irq, void *dev_id)
{
struct xtfpga_i2s *i2s = dev_id;
struct snd_pcm_substream *tx_substream;
unsigned config, int_status, int_mask;
regmap_read(i2s->regmap, XTFPGA_I2S_CONFIG, &config);
regmap_read(i2s->regmap, XTFPGA_I2S_INT_MASK, &int_mask);
regmap_read(i2s->regmap, XTFPGA_I2S_INT_STATUS, &int_status);
if (!(config & XTFPGA_I2S_CONFIG_INT_ENABLE) ||
!(int_status & int_mask & XTFPGA_I2S_INT_VALID))
return IRQ_NONE;
/* Update FIFO level estimate in accordance with interrupt status
* register.
*/
if (int_status & XTFPGA_I2S_INT_UNDERRUN) {
i2s->tx_fifo_level = 0;
regmap_update_bits(i2s->regmap, XTFPGA_I2S_CONFIG,
XTFPGA_I2S_CONFIG_TX_ENABLE, 0);
} else {
/* The FIFO isn't empty, but is below tx_fifo_low. Estimate
* it as tx_fifo_low.
*/
i2s->tx_fifo_level = i2s->tx_fifo_low;
}
rcu_read_lock();
tx_substream = rcu_dereference(i2s->tx_substream);
if (tx_substream && snd_pcm_running(tx_substream)) {
snd_pcm_period_elapsed(tx_substream);
if (int_status & XTFPGA_I2S_INT_UNDERRUN)
dev_dbg_ratelimited(i2s->dev, "%s: underrun\n",
__func__);
}
rcu_read_unlock();
/* Refill FIFO, update allowed IRQ reasons, enable IRQ if FIFO is
* not empty.
*/
xtfpga_pcm_refill_fifo(i2s);
return IRQ_HANDLED;
}
static int xtfpga_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct xtfpga_i2s *i2s = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_set_dma_data(dai, substream, i2s);
return 0;
}
static int xtfpga_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct xtfpga_i2s *i2s = snd_soc_dai_get_drvdata(dai);
unsigned srate = params_rate(params);
unsigned channels = params_channels(params);
unsigned period_size = params_period_size(params);
unsigned sample_size = snd_pcm_format_width(params_format(params));
unsigned freq, ratio, level;
int err;
regmap_update_bits(i2s->regmap, XTFPGA_I2S_CONFIG,
XTFPGA_I2S_CONFIG_RES_MASK,
sample_size << XTFPGA_I2S_CONFIG_RES_BASE);
freq = 256 * srate;
err = clk_set_rate(i2s->clk, freq);
if (err < 0)
return err;
/* ratio field of the config register controls MCLK->I2S clock
* derivation: I2S clock = MCLK / (2 * (ratio + 2)).
*
* So with MCLK = 256 * sample rate ratio is 0 for 32 bit stereo
* and 2 for 16 bit stereo.
*/
ratio = (freq - (srate * sample_size * 8)) /
(srate * sample_size * 4);
regmap_update_bits(i2s->regmap, XTFPGA_I2S_CONFIG,
XTFPGA_I2S_CONFIG_RATIO_MASK,
ratio << XTFPGA_I2S_CONFIG_RATIO_BASE);
i2s->tx_fifo_low = XTFPGA_I2S_FIFO_SIZE / 2;
/* period_size * 2: FIFO always gets 2 samples per frame */
for (level = 1;
i2s->tx_fifo_low / 2 >= period_size * 2 &&
level < (XTFPGA_I2S_CONFIG_LEVEL_MASK >>
XTFPGA_I2S_CONFIG_LEVEL_BASE); ++level)
i2s->tx_fifo_low /= 2;
i2s->tx_fifo_high = 2 * i2s->tx_fifo_low;
regmap_update_bits(i2s->regmap, XTFPGA_I2S_CONFIG,
XTFPGA_I2S_CONFIG_LEVEL_MASK,
level << XTFPGA_I2S_CONFIG_LEVEL_BASE);
dev_dbg(i2s->dev,
"%s srate: %u, channels: %u, sample_size: %u, period_size: %u\n",
__func__, srate, channels, sample_size, period_size);
dev_dbg(i2s->dev, "%s freq: %u, ratio: %u, level: %u\n",
__func__, freq, ratio, level);
return 0;
}
static int xtfpga_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF)
return -EINVAL;
if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
return -EINVAL;
if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_I2S)
return -EINVAL;
return 0;
}
/* PCM */
static const struct snd_pcm_hardware xtfpga_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_BLOCK_TRANSFER,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S32_LE,
.channels_min = 1,
.channels_max = 2,
.period_bytes_min = 2,
.period_bytes_max = XTFPGA_I2S_FIFO_SIZE / 2 * 8,
.periods_min = 2,
.periods_max = XTFPGA_I2S_FIFO_SIZE * 8 / 2,
.buffer_bytes_max = XTFPGA_I2S_FIFO_SIZE * 8,
.fifo_size = 16,
};
static int xtfpga_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
void *p;
snd_soc_set_runtime_hwparams(substream, &xtfpga_pcm_hardware);
p = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
runtime->private_data = p;
return 0;
}
static int xtfpga_pcm_close(struct snd_pcm_substream *substream)
{
synchronize_rcu();
return 0;
}
static int xtfpga_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
int ret;
struct snd_pcm_runtime *runtime = substream->runtime;
struct xtfpga_i2s *i2s = runtime->private_data;
unsigned channels = params_channels(hw_params);
switch (channels) {
case 1:
case 2:
break;
default:
return -EINVAL;
}
switch (params_format(hw_params)) {
case SNDRV_PCM_FORMAT_S16_LE:
i2s->tx_fn = (channels == 1) ?
xtfpga_pcm_tx_1x16 :
xtfpga_pcm_tx_2x16;
break;
case SNDRV_PCM_FORMAT_S32_LE:
i2s->tx_fn = (channels == 1) ?
xtfpga_pcm_tx_1x32 :
xtfpga_pcm_tx_2x32;
break;
default:
return -EINVAL;
}
ret = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
return ret;
}
static int xtfpga_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
int ret = 0;
struct snd_pcm_runtime *runtime = substream->runtime;
struct xtfpga_i2s *i2s = runtime->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
ACCESS_ONCE(i2s->tx_ptr) = 0;
rcu_assign_pointer(i2s->tx_substream, substream);
xtfpga_pcm_refill_fifo(i2s);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
rcu_assign_pointer(i2s->tx_substream, NULL);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static snd_pcm_uframes_t xtfpga_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct xtfpga_i2s *i2s = runtime->private_data;
snd_pcm_uframes_t pos = ACCESS_ONCE(i2s->tx_ptr);
return pos < runtime->buffer_size ? pos : 0;
}
static int xtfpga_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_card *card = rtd->card->snd_card;
size_t size = xtfpga_pcm_hardware.buffer_bytes_max;
return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
SNDRV_DMA_TYPE_DEV,
card->dev, size, size);
}
static void xtfpga_pcm_free(struct snd_pcm *pcm)
{
snd_pcm_lib_preallocate_free_for_all(pcm);
}
static const struct snd_pcm_ops xtfpga_pcm_ops = {
.open = xtfpga_pcm_open,
.close = xtfpga_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = xtfpga_pcm_hw_params,
.trigger = xtfpga_pcm_trigger,
.pointer = xtfpga_pcm_pointer,
};
static const struct snd_soc_platform_driver xtfpga_soc_platform = {
.pcm_new = xtfpga_pcm_new,
.pcm_free = xtfpga_pcm_free,
.ops = &xtfpga_pcm_ops,
};
static const struct snd_soc_component_driver xtfpga_i2s_component = {
.name = DRV_NAME,
};
static const struct snd_soc_dai_ops xtfpga_i2s_dai_ops = {
.startup = xtfpga_i2s_startup,
.hw_params = xtfpga_i2s_hw_params,
.set_fmt = xtfpga_i2s_set_fmt,
};
static struct snd_soc_dai_driver xtfpga_i2s_dai[] = {
{
.name = "xtfpga-i2s",
.id = 0,
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S32_LE,
},
.ops = &xtfpga_i2s_dai_ops,
},
};
static int xtfpga_i2s_runtime_suspend(struct device *dev)
{
struct xtfpga_i2s *i2s = dev_get_drvdata(dev);
clk_disable_unprepare(i2s->clk);
return 0;
}
static int xtfpga_i2s_runtime_resume(struct device *dev)
{
struct xtfpga_i2s *i2s = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(i2s->clk);
if (ret) {
dev_err(dev, "clk_prepare_enable failed: %d\n", ret);
return ret;
}
return 0;
}
static int xtfpga_i2s_probe(struct platform_device *pdev)
{
struct xtfpga_i2s *i2s;
struct resource *mem;
int err, irq;
i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
if (!i2s) {
err = -ENOMEM;
goto err;
}
platform_set_drvdata(pdev, i2s);
i2s->dev = &pdev->dev;
dev_dbg(&pdev->dev, "dev: %p, i2s: %p\n", &pdev->dev, i2s);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
i2s->regs = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(i2s->regs)) {
err = PTR_ERR(i2s->regs);
goto err;
}
i2s->regmap = devm_regmap_init_mmio(&pdev->dev, i2s->regs,
&xtfpga_i2s_regmap_config);
if (IS_ERR(i2s->regmap)) {
dev_err(&pdev->dev, "regmap init failed\n");
err = PTR_ERR(i2s->regmap);
goto err;
}
i2s->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(i2s->clk)) {
dev_err(&pdev->dev, "couldn't get clock\n");
err = PTR_ERR(i2s->clk);
goto err;
}
regmap_write(i2s->regmap, XTFPGA_I2S_CONFIG,
(0x1 << XTFPGA_I2S_CONFIG_CHANNEL_BASE));
regmap_write(i2s->regmap, XTFPGA_I2S_INT_STATUS, XTFPGA_I2S_INT_VALID);
regmap_write(i2s->regmap, XTFPGA_I2S_INT_MASK, XTFPGA_I2S_INT_UNDERRUN);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "No IRQ resource\n");
err = irq;
goto err;
}
err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
xtfpga_i2s_threaded_irq_handler,
IRQF_SHARED | IRQF_ONESHOT,
pdev->name, i2s);
if (err < 0) {
dev_err(&pdev->dev, "request_irq failed\n");
goto err;
}
err = snd_soc_register_platform(&pdev->dev, &xtfpga_soc_platform);
if (err < 0) {
dev_err(&pdev->dev, "couldn't register platform\n");
goto err;
}
err = devm_snd_soc_register_component(&pdev->dev,
&xtfpga_i2s_component,
xtfpga_i2s_dai,
ARRAY_SIZE(xtfpga_i2s_dai));
if (err < 0) {
dev_err(&pdev->dev, "couldn't register component\n");
goto err_unregister_platform;
}
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
err = xtfpga_i2s_runtime_resume(&pdev->dev);
if (err)
goto err_pm_disable;
}
return 0;
err_pm_disable:
pm_runtime_disable(&pdev->dev);
err_unregister_platform:
snd_soc_unregister_platform(&pdev->dev);
err:
dev_err(&pdev->dev, "%s: err = %d\n", __func__, err);
return err;
}
static int xtfpga_i2s_remove(struct platform_device *pdev)
{
struct xtfpga_i2s *i2s = dev_get_drvdata(&pdev->dev);
snd_soc_unregister_platform(&pdev->dev);
if (i2s->regmap && !IS_ERR(i2s->regmap)) {
regmap_write(i2s->regmap, XTFPGA_I2S_CONFIG, 0);
regmap_write(i2s->regmap, XTFPGA_I2S_INT_MASK, 0);
regmap_write(i2s->regmap, XTFPGA_I2S_INT_STATUS,
XTFPGA_I2S_INT_VALID);
}
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
xtfpga_i2s_runtime_suspend(&pdev->dev);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id xtfpga_i2s_of_match[] = {
{ .compatible = "cdns,xtfpga-i2s", },
{},
};
MODULE_DEVICE_TABLE(of, xtfpga_i2s_of_match);
#endif
static const struct dev_pm_ops xtfpga_i2s_pm_ops = {
SET_RUNTIME_PM_OPS(xtfpga_i2s_runtime_suspend,
xtfpga_i2s_runtime_resume, NULL)
};
static struct platform_driver xtfpga_i2s_driver = {
.probe = xtfpga_i2s_probe,
.remove = xtfpga_i2s_remove,
.driver = {
.name = "xtfpga-i2s",
.of_match_table = of_match_ptr(xtfpga_i2s_of_match),
.pm = &xtfpga_i2s_pm_ops,
},
};
module_platform_driver(xtfpga_i2s_driver);
MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>");
MODULE_DESCRIPTION("xtfpga I2S controller driver");
MODULE_LICENSE("GPL v2");
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