* [PATCH 3/4] ASoC: dwc: Add I2S HDMI audio support using custom platform driver
2016-02-19 9:39 [PATCH 0/4] Add I2S/ADV7511 audio support for ARC AXS10x boards Carlos Palminha
2016-02-19 9:39 ` [PATCH 2/4] ARC: axs10x: Update defconfigs so that audio is enabled Carlos Palminha
@ 2016-02-19 9:40 ` Carlos Palminha
2016-02-19 9:40 ` [PATCH 4/4] ARC: axs10x: Update defconfigs so that I2S is enabled Carlos Palminha
2 siblings, 0 replies; 4+ messages in thread
From: Carlos Palminha @ 2016-02-19 9:40 UTC (permalink / raw)
To: linux-snps-arc
From: Jose Abreu <joabreu@synopsys.com>
HDMI audio support was added to the AXS board using an
I2S cpu driver and a custom platform driver.
The platform driver supports two channels @ 16 bits with
rates 32k, 44.1k and 48k. ALSA Simple audio card is used to
glue the cpu, platform and codec driver (adv7511).
Signed-off-by: Jose Abreu <joabreu at synopsys.com>
---
arch/arc/boot/dts/axs10x_mb.dtsi | 20 ++-
sound/soc/dwc/Kconfig | 1 +
sound/soc/dwc/Makefile | 4 +-
sound/soc/dwc/designware_i2s.c | 139 +++++++++++++++++++--
sound/soc/dwc/designware_pcm.c | 264 +++++++++++++++++++++++++++++++++++++++
sound/soc/dwc/designware_pcm.h | 21 ++++
6 files changed, 430 insertions(+), 19 deletions(-)
create mode 100644 sound/soc/dwc/designware_pcm.c
create mode 100644 sound/soc/dwc/designware_pcm.h
diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi
index e00e5bb..c137376 100644
--- a/arch/arc/boot/dts/axs10x_mb.dtsi
+++ b/arch/arc/boot/dts/axs10x_mb.dtsi
@@ -130,12 +130,23 @@
interrupts = <14>;
};
- i2c at 0x1e000 {
- compatible = "snps,designware-i2c";
+ i2s: i2s at 0x1e000 {
+ compatible = "snps,designware-i2s";
reg = <0x1e000 0x100>;
- clock-frequency = <400000>;
- clocks = <&i2cclk>;
interrupts = <15>;
+ #sound-dai-cells = <0>;
+ };
+
+ sound {
+ compatible = "simple-audio-card";
+ simple-audio-card,name = "AXS10X HDMI Audio";
+ simple-audio-card,format = "i2s";
+ simple-audio-card,cpu {
+ sound-dai = <&i2s>;
+ };
+ simple-audio-card,codec {
+ sound-dai = <&adv7511>;
+ };
};
i2c at 0x1f000 {
@@ -155,6 +166,7 @@
adi,input-colorspace = "rgb";
adi,input-clock = "1x";
adi,clock-delay = <0x03>;
+ #sound-dai-cells = <0>;
ports {
#address-cells = <1>;
diff --git a/sound/soc/dwc/Kconfig b/sound/soc/dwc/Kconfig
index d50e085..bc3fae7 100644
--- a/sound/soc/dwc/Kconfig
+++ b/sound/soc/dwc/Kconfig
@@ -2,6 +2,7 @@ config SND_DESIGNWARE_I2S
tristate "Synopsys I2S Device Driver"
depends on CLKDEV_LOOKUP
select SND_SOC_GENERIC_DMAENGINE_PCM
+ select SND_SIMPLE_CARD
help
Say Y or M if you want to add support for I2S driver for
Synopsys desigwnware I2S device. The device supports upto
diff --git a/sound/soc/dwc/Makefile b/sound/soc/dwc/Makefile
index 319371f..4d8f869 100644
--- a/sound/soc/dwc/Makefile
+++ b/sound/soc/dwc/Makefile
@@ -1,3 +1,3 @@
# SYNOPSYS Platform Support
-obj-$(CONFIG_SND_DESIGNWARE_I2S) += designware_i2s.o
-
+obj-$(CONFIG_SND_DESIGNWARE_I2S) += dwc_i2s.o
+dwc_i2s-y := designware_i2s.o designware_pcm.o
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index bff258d..db9aced 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -25,6 +25,8 @@
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
+#include "designware_pcm.h"
+
/* common register for all channel */
#define IER 0x000
#define IRER 0x004
@@ -84,6 +86,11 @@
#define MAX_CHANNEL_NUM 8
#define MIN_CHANNEL_NUM 2
+/* PLL registers addresses */
+#define PLL_IDIV_ADDR 0xE00100A0
+#define PLL_FBDIV_ADDR 0xE00100A4
+#define PLL_ODIV_ADDR 0xE00100A8
+
union dw_i2s_snd_dma_data {
struct i2s_dma_data pd;
struct snd_dmaengine_dai_dma_data dt;
@@ -100,12 +107,32 @@ struct dw_i2s_dev {
struct device *dev;
u32 ccr;
u32 xfer_resolution;
+ u32 xfer_bytes;
+ u32 fifo_th;
/* data related to DMA transfers b/w i2s and DMAC */
union dw_i2s_snd_dma_data play_dma_data;
union dw_i2s_snd_dma_data capture_dma_data;
struct i2s_clk_config_data config;
int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
+ int (*pcm_get)(u32 *lsample, u32 *rsample, int bytes, int buf_size);
+};
+
+struct dw_i2s_pll {
+ unsigned int rate;
+ unsigned int data_width;
+ unsigned int idiv;
+ unsigned int fbdiv;
+ unsigned int odiv;
+};
+
+static const struct dw_i2s_pll dw_i2s_pll_cfg[] = {
+ { 32000, 16, 0x104, 0x451, 0x10E38 }, /* 32 kHz */
+ { 32000, 32, 0x82, 0x451, 0x10E38 },
+ { 44100, 16, 0x104, 0x596, 0x10D35}, /* 44.1 kHz */
+ { 44100, 32, 0x82, 0x596, 0x10D35 },
+ { 48000, 16, 0x208, 0xA28, 0x10B2C }, /* 48 kHz */
+ { 48000, 32, 0x104, 0xA28, 0x10B2C },
};
static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
@@ -144,20 +171,72 @@ static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
}
}
+static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
+{
+ struct dw_i2s_dev *dev = dev_id;
+ u32 isr[4], sleft[dev->fifo_th], sright[dev->fifo_th];
+ int i, j;
+
+ for (i = 0; i < 4; i++)
+ isr[i] = i2s_read_reg(dev->i2s_base, ISR(i));
+
+ for (i = 0; i < 4; i++) {
+ /* Copy only to first two channels.
+ TODO: Remaining channels */
+ if ((isr[i] & 0x10) && (i == 0) && (dev->pcm_get)) {
+ /* TXFE - TX FIFO is empty */
+ dev->pcm_get(sleft, sright, dev->xfer_bytes,
+ dev->fifo_th);
+
+ for (j = 0; j < dev->fifo_th; j++) {
+ i2s_write_reg(dev->i2s_base, LRBR_LTHR(i),
+ sleft[j]);
+ i2s_write_reg(dev->i2s_base, RRBR_RTHR(i),
+ sright[j]);
+ }
+ }
+ }
+
+ i2s_clear_irqs(dev, SNDRV_PCM_STREAM_PLAYBACK);
+ i2s_clear_irqs(dev, SNDRV_PCM_STREAM_CAPTURE);
+
+ return IRQ_HANDLED;
+}
+
+static int i2s_pll_cfg(struct i2s_clk_config_data *config)
+{
+ u32 rate = config->sample_rate;
+ u32 data_width = config->data_width;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dw_i2s_pll_cfg); i++) {
+ if ((dw_i2s_pll_cfg[i].rate == rate) &&
+ (dw_i2s_pll_cfg[i].data_width == data_width)) {
+ writel(dw_i2s_pll_cfg[i].idiv, (void *)PLL_IDIV_ADDR);
+ writel(dw_i2s_pll_cfg[i].fbdiv, (void *)PLL_FBDIV_ADDR);
+ writel(dw_i2s_pll_cfg[i].odiv, (void *)PLL_ODIV_ADDR);
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
static void i2s_start(struct dw_i2s_dev *dev,
struct snd_pcm_substream *substream)
{
+ struct i2s_clk_config_data *config = &dev->config;
u32 i, irq;
i2s_write_reg(dev->i2s_base, IER, 1);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- for (i = 0; i < 4; i++) {
+ for (i = 0; i < (config->chan_nr / 2); i++) {
irq = i2s_read_reg(dev->i2s_base, IMR(i));
i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x30);
}
i2s_write_reg(dev->i2s_base, ITER, 1);
} else {
- for (i = 0; i < 4; i++) {
+ for (i = 0; i < (config->chan_nr / 2); i++) {
irq = i2s_read_reg(dev->i2s_base, IMR(i));
i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x03);
}
@@ -231,14 +310,16 @@ static void dw_i2s_config(struct dw_i2s_dev *dev, int stream)
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
i2s_write_reg(dev->i2s_base, TCR(ch_reg),
dev->xfer_resolution);
- i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
+ i2s_write_reg(dev->i2s_base, TFCR(ch_reg),
+ dev->fifo_th - 1);
irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
} else {
i2s_write_reg(dev->i2s_base, RCR(ch_reg),
dev->xfer_resolution);
- i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
+ i2s_write_reg(dev->i2s_base, RFCR(ch_reg),
+ dev->fifo_th - 1);
irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
@@ -259,22 +340,25 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
config->data_width = 16;
dev->ccr = 0x00;
dev->xfer_resolution = 0x02;
+ dev->xfer_bytes = 0x02;
break;
case SNDRV_PCM_FORMAT_S24_LE:
config->data_width = 24;
dev->ccr = 0x08;
dev->xfer_resolution = 0x04;
+ dev->xfer_bytes = 0x03;
break;
case SNDRV_PCM_FORMAT_S32_LE:
config->data_width = 32;
dev->ccr = 0x10;
dev->xfer_resolution = 0x05;
+ dev->xfer_bytes = 0x04;
break;
default:
- dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
+ dev_err(dev->dev, "designware-i2s: unsupported PCM fmt");
return -EINVAL;
}
@@ -611,6 +695,7 @@ static int dw_configure_dai_by_dt(struct dw_i2s_dev *dev,
dev->capture_dma_data.dt.maxburst = 16;
}
+ dev->fifo_th = fifo_depth / 2;
return 0;
}
@@ -620,7 +705,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
const struct i2s_platform_data *pdata = pdev->dev.platform_data;
struct dw_i2s_dev *dev;
struct resource *res;
- int ret;
+ int ret, irq_number;
struct snd_soc_dai_driver *dw_i2s_dai;
const char *clk_id;
@@ -643,6 +728,19 @@ static int dw_i2s_probe(struct platform_device *pdev)
if (IS_ERR(dev->i2s_base))
return PTR_ERR(dev->i2s_base);
+ irq_number = platform_get_irq(pdev, 0);
+ if (irq_number <= 0) {
+ dev_err(&pdev->dev, "get irq fail\n");
+ return -EINVAL;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq_number, i2s_irq_handler,
+ IRQF_SHARED, "dw_i2s_irq_handler", dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "request irq fail\n");
+ return ret;
+ }
+
dev->dev = &pdev->dev;
dev->i2s_reg_comp1 = I2S_COMP_PARAM_1;
@@ -671,14 +769,22 @@ static int dw_i2s_probe(struct platform_device *pdev)
return -ENODEV;
}
}
- dev->clk = devm_clk_get(&pdev->dev, clk_id);
- if (IS_ERR(dev->clk))
- return PTR_ERR(dev->clk);
+ if (dev->i2s_clk_cfg ||
+ of_get_property(pdev->dev.of_node, "clocks", NULL)) {
+ dev->clk = devm_clk_get(&pdev->dev, clk_id);
+
+ if (IS_ERR(dev->clk))
+ return PTR_ERR(dev->clk);
- ret = clk_prepare_enable(dev->clk);
- if (ret < 0)
- return ret;
+ ret = clk_prepare_enable(dev->clk);
+ if (ret < 0)
+ return ret;
+ } else {
+ /* Use internal PLL config */
+ dev->i2s_clk_cfg = i2s_pll_cfg;
+ dev->clk = NULL;
+ }
}
dev_set_drvdata(&pdev->dev, dev);
@@ -690,7 +796,14 @@ static int dw_i2s_probe(struct platform_device *pdev)
}
if (!pdata) {
- ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (of_get_property(pdev->dev.of_node, "dmas", NULL)) {
+ /* Using DMA */
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ } else {
+ ret = dw_pcm_platform_register(pdev);
+ dev->pcm_get = dw_pcm_platform_get;
+ }
+
if (ret) {
dev_err(&pdev->dev,
"Could not register PCM: %d\n", ret);
diff --git a/sound/soc/dwc/designware_pcm.c b/sound/soc/dwc/designware_pcm.c
new file mode 100644
index 0000000..e1928b8
--- /dev/null
+++ b/sound/soc/dwc/designware_pcm.c
@@ -0,0 +1,264 @@
+/*
+ * ALSA Platform Synopsys Audio Layer
+ *
+ * sound/soc/dwc/designware_pcm.c
+ *
+ * Copyright (C) 2016 Synopsys
+ * Jose Abreu <joabreu at synopsys.com>, Tiago Duarte
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+struct dw_pcm_binfo {
+ struct snd_pcm_substream *stream;
+ spinlock_t lock;
+ unsigned char *dma_base;
+ unsigned char *dma_pointer;
+ unsigned int period_size_frames;
+ unsigned int size;
+ snd_pcm_uframes_t period_pointer;
+ unsigned int total_periods;
+ unsigned int current_period;
+};
+
+static const struct snd_pcm_hardware dw_pcm_playback_hw = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+ .rates = SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000,
+ .rate_min = 32000,
+ .rate_max = 48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .channels_min = 2,
+ .channels_max = 2,
+ .buffer_bytes_max = 1152000,
+ .period_bytes_min = 64000,
+ .period_bytes_max = 576000,
+ .periods_min = 8,
+ .periods_max = 18,
+};
+
+static struct dw_pcm_binfo *dw_pcm_bi;
+
+static int dw_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *rt = substream->runtime;
+ struct dw_pcm_binfo *bi;
+
+ snd_soc_set_runtime_hwparams(substream, &dw_pcm_playback_hw);
+ snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
+
+ bi = kzalloc(sizeof(*bi), GFP_KERNEL);
+ if (!bi)
+ return -ENOMEM;
+
+ dw_pcm_bi = bi;
+ spin_lock_init(&bi->lock);
+
+ rt->hw.rate_min = 32000;
+ rt->hw.rate_max = 48000;
+
+ spin_lock(&bi->lock);
+ bi->stream = substream;
+ rt->private_data = bi;
+ spin_unlock(&bi->lock);
+
+ return 0;
+}
+
+static int dw_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *rt = substream->runtime;
+ struct dw_pcm_binfo *bi = rt->private_data;
+
+ kfree(bi);
+ dw_pcm_bi = NULL;
+ return 0;
+}
+
+static int dw_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_pcm_runtime *rt = substream->runtime;
+ struct dw_pcm_binfo *bi = rt->private_data;
+ int ret;
+
+ ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+ if (ret < 0)
+ return ret;
+
+ memset(rt->dma_area, 0, params_buffer_bytes(hw_params));
+
+ spin_lock(&bi->lock);
+ bi->dma_base = rt->dma_area;
+ bi->dma_pointer = bi->dma_base;
+ spin_unlock(&bi->lock);
+
+ return 0;
+}
+
+static int dw_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ int ret;
+
+ ret = snd_pcm_lib_free_vmalloc_buffer(substream);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int dw_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *rt = substream->runtime;
+ struct dw_pcm_binfo *bi = rt->private_data;
+ u32 buffer_size_frames = 0;
+
+ spin_lock(&bi->lock);
+ bi->period_size_frames = bytes_to_frames(rt,
+ snd_pcm_lib_period_bytes(substream));
+ bi->size = snd_pcm_lib_buffer_bytes(substream);
+ buffer_size_frames = bytes_to_frames(rt, bi->size);
+ bi->total_periods = buffer_size_frames / bi->period_size_frames;
+ bi->current_period = 1;
+ spin_unlock(&bi->lock);
+
+ if ((buffer_size_frames % bi->period_size_frames) != 0)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int dw_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static snd_pcm_uframes_t dw_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *rt = substream->runtime;
+ struct dw_pcm_binfo *bi = rt->private_data;
+
+ return bi->period_pointer;
+}
+
+static struct snd_pcm_ops dw_pcm_capture_ops = {
+ .open = dw_pcm_open,
+ .close = dw_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = dw_pcm_hw_params,
+ .hw_free = dw_pcm_hw_free,
+ .prepare = dw_pcm_prepare,
+ .trigger = dw_pcm_trigger,
+ .pointer = dw_pcm_pointer,
+ .page = snd_pcm_lib_get_vmalloc_page,
+ .mmap = snd_pcm_lib_mmap_vmalloc,
+};
+
+static int dw_pcm_new(struct snd_soc_pcm_runtime *runtime)
+{
+ struct snd_pcm *pcm = runtime->pcm;
+ int ret;
+
+ ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
+ SNDRV_DMA_TYPE_DEV,
+ snd_dma_continuous_data(GFP_KERNEL),
+ dw_pcm_playback_hw.buffer_bytes_max,
+ dw_pcm_playback_hw.buffer_bytes_max);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static void dw_pcm_free(struct snd_pcm *pcm)
+{
+ snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static struct snd_soc_platform_driver dw_pcm_soc_platform = {
+ .pcm_new = dw_pcm_new,
+ .pcm_free = dw_pcm_free,
+ .ops = &dw_pcm_capture_ops,
+};
+
+int dw_pcm_platform_get(u32 *lsample, u32 *rsample, int bytes, int buf_size)
+{
+ struct snd_pcm_runtime *rt = NULL;
+ struct dw_pcm_binfo *bi = dw_pcm_bi;
+ int i;
+
+ if (!bi)
+ return -1;
+
+ rt = bi->stream->runtime;
+
+ spin_lock(&bi->lock);
+ for (i = 0; i < buf_size; i++) {
+ memcpy(&lsample[i], bi->dma_pointer, bytes);
+ memset(bi->dma_pointer, 0, bytes);
+ bi->dma_pointer += bytes;
+
+ memcpy(&rsample[i], bi->dma_pointer, bytes);
+ memset(bi->dma_pointer, 0, bytes);
+ bi->dma_pointer += bytes;
+ }
+ bi->period_pointer += bytes_to_frames(rt, bytes * 2 * buf_size);
+
+ if (bi->period_pointer >=
+ (bi->period_size_frames * bi->current_period)) {
+ bi->current_period++;
+ if (bi->current_period > bi->total_periods) {
+ bi->dma_pointer = bi->dma_base;
+ bi->period_pointer = 0;
+ bi->current_period = 1;
+ }
+
+ spin_unlock(&bi->lock);
+ snd_pcm_period_elapsed(bi->stream);
+ spin_lock(&bi->lock);
+ }
+
+ spin_unlock(&bi->lock);
+ return 0;
+}
+
+int dw_pcm_platform_register(struct platform_device *pdev)
+{
+ return snd_soc_register_platform(&pdev->dev, &dw_pcm_soc_platform);
+}
+
+int dw_pcm_platform_unregister(struct platform_device *pdev)
+{
+ snd_soc_unregister_platform(&pdev->dev);
+ return 0;
+}
+
+MODULE_AUTHOR("Jose Abreu <joabreu at synopsys.com>, Tiago Duarte");
+MODULE_DESCRIPTION("Synopsys PCM module");
+MODULE_LICENSE("GPL");
\ No newline at end of file
diff --git a/sound/soc/dwc/designware_pcm.h b/sound/soc/dwc/designware_pcm.h
new file mode 100644
index 0000000..20bf65b
--- /dev/null
+++ b/sound/soc/dwc/designware_pcm.h
@@ -0,0 +1,21 @@
+/*
+ * ALSA Platform Synopsys Audio Layer
+ *
+ * sound/soc/dwc/designware_pcm.h
+ *
+ * Copyright (C) 2016 Synopsys
+ * Jose Abreu <joabreu at synopsys.com>, Tiago Duarte
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef __DW_PCM_H
+#define __DW_PCM_H
+
+int dw_pcm_platform_get(u32 *lsample, u32 *rsample, int bytes, int buf_size);
+int dw_pcm_platform_register(struct platform_device *pdev);
+int dw_pcm_platform_unregister(struct platform_device *pdev);
+
+#endif /* __DW_PCM_H */
\ No newline at end of file
--
2.5.0
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