ASoC: Add driver for s6000 I2S interface

This patch adds a driver for the I2S interface found on Stretch s6000
family processors.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

8 files changed, 1204 insertions, 0 deletions

diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index 3d2bb6fc6dcc..3304f9dd92fa 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -32,6 +32,7 @@ source "sound/soc/fsl/Kconfig"
 source "sound/soc/omap/Kconfig"
 source "sound/soc/pxa/Kconfig"
 source "sound/soc/s3c24xx/Kconfig"
+source "sound/soc/s6000/Kconfig"
 source "sound/soc/sh/Kconfig"
 
 # Supported codecs
diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 0237879fd412..8943a140c818 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -10,4 +10,5 @@ obj-$(CONFIG_SND_SOC)	+= fsl/
 obj-$(CONFIG_SND_SOC)   += omap/
 obj-$(CONFIG_SND_SOC)   += pxa/
 obj-$(CONFIG_SND_SOC)   += s3c24xx/
+obj-$(CONFIG_SND_SOC)   += s6000/
 obj-$(CONFIG_SND_SOC)   += sh/
diff --git a/sound/soc/s6000/Kconfig b/sound/soc/s6000/Kconfig
new file mode 100644
index 000000000000..4bfc8bcac51b
--- /dev/null
+++ b/sound/soc/s6000/Kconfig
@@ -0,0 +1,10 @@
+config SND_S6000_SOC
+        tristate "SoC Audio for the Stretch s6000 family"
+        depends on XTENSA_VARIANT_S6000
+        help
+          Say Y or M if you want to add support for codecs attached to
+          s6000 family chips. You will also need to select the platform
+          to support below.
+
+config SND_S6000_SOC_I2S
+        tristate
diff --git a/sound/soc/s6000/Makefile b/sound/soc/s6000/Makefile
new file mode 100644
index 000000000000..df15f876a1a9
--- /dev/null
+++ b/sound/soc/s6000/Makefile
@@ -0,0 +1,6 @@
+# s6000 Platform Support
+snd-soc-s6000-objs := s6000-pcm.o
+snd-soc-s6000-i2s-objs := s6000-i2s.o
+
+obj-$(CONFIG_SND_S6000_SOC) += snd-soc-s6000.o
+obj-$(CONFIG_SND_S6000_SOC_I2S) += snd-soc-s6000-i2s.o
diff --git a/sound/soc/s6000/s6000-i2s.c b/sound/soc/s6000/s6000-i2s.c
new file mode 100644
index 000000000000..dcc79040bdac
--- /dev/null
+++ b/sound/soc/s6000/s6000-i2s.c
@@ -0,0 +1,629 @@
+/*
+ * ALSA SoC I2S Audio Layer for the Stretch S6000 family
+ *
+ * Author:      Daniel Gloeckner, <dg@emlix.com>
+ * Copyright:   (C) 2009 emlix GmbH <info@emlix.com>
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "s6000-i2s.h"
+#include "s6000-pcm.h"
+
+struct s6000_i2s_dev {
+        dma_addr_t sifbase;
+        u8 __iomem *scbbase;
+        unsigned int wide;
+        unsigned int channel_in;
+        unsigned int channel_out;
+        unsigned int lines_in;
+        unsigned int lines_out;
+        struct s6000_pcm_dma_params dma_params;
+};
+
+#define S6_I2S_INTERRUPT_STATUS 0x00
+#define   S6_I2S_INT_OVERRUN    1
+#define   S6_I2S_INT_UNDERRUN   2
+#define   S6_I2S_INT_ALIGNMENT  4
+#define S6_I2S_INTERRUPT_ENABLE 0x04
+#define S6_I2S_INTERRUPT_RAW    0x08
+#define S6_I2S_INTERRUPT_CLEAR  0x0C
+#define S6_I2S_INTERRUPT_SET    0x10
+#define S6_I2S_MODE             0x20
+#define   S6_I2S_DUAL           0
+#define   S6_I2S_WIDE           1
+#define S6_I2S_TX_DEFAULT       0x24
+#define S6_I2S_DATA_CFG(c)      (0x40 + 0x10 * (c))
+#define   S6_I2S_IN             0
+#define   S6_I2S_OUT            1
+#define   S6_I2S_UNUSED         2
+#define S6_I2S_INTERFACE_CFG(c) (0x44 + 0x10 * (c))
+#define   S6_I2S_DIV_MASK       0x001fff
+#define   S6_I2S_16BIT          0x000000
+#define   S6_I2S_20BIT          0x002000
+#define   S6_I2S_24BIT          0x004000
+#define   S6_I2S_32BIT          0x006000
+#define   S6_I2S_BITS_MASK      0x006000
+#define   S6_I2S_MEM_16BIT      0x000000
+#define   S6_I2S_MEM_32BIT      0x008000
+#define   S6_I2S_MEM_MASK       0x008000
+#define   S6_I2S_CHANNELS_SHIFT 16
+#define   S6_I2S_CHANNELS_MASK  0x030000
+#define   S6_I2S_SCK_IN         0x000000
+#define   S6_I2S_SCK_OUT        0x040000
+#define   S6_I2S_SCK_DIR        0x040000
+#define   S6_I2S_WS_IN          0x000000
+#define   S6_I2S_WS_OUT         0x080000
+#define   S6_I2S_WS_DIR         0x080000
+#define   S6_I2S_LEFT_FIRST     0x000000
+#define   S6_I2S_RIGHT_FIRST    0x100000
+#define   S6_I2S_FIRST          0x100000
+#define   S6_I2S_CUR_SCK        0x200000
+#define   S6_I2S_CUR_WS         0x400000
+#define S6_I2S_ENABLE(c)        (0x48 + 0x10 * (c))
+#define   S6_I2S_DISABLE_IF     0x02
+#define   S6_I2S_ENABLE_IF      0x03
+#define   S6_I2S_IS_BUSY        0x04
+#define   S6_I2S_DMA_ACTIVE     0x08
+#define   S6_I2S_IS_ENABLED     0x10
+
+#define S6_I2S_NUM_LINES        4
+
+#define S6_I2S_SIF_PORT0        0x0000000
+#define S6_I2S_SIF_PORT1        0x0000080 /* docs say 0x0000010 */
+
+static inline void s6_i2s_write_reg(struct s6000_i2s_dev *dev, int reg, u32 val)
+{
+        writel(val, dev->scbbase + reg);
+}
+
+static inline u32 s6_i2s_read_reg(struct s6000_i2s_dev *dev, int reg)
+{
+        return readl(dev->scbbase + reg);
+}
+
+static inline void s6_i2s_mod_reg(struct s6000_i2s_dev *dev, int reg,
+                                  u32 mask, u32 val)
+{
+        val ^= s6_i2s_read_reg(dev, reg) & ~mask;
+        s6_i2s_write_reg(dev, reg, val);
+}
+
+static void s6000_i2s_start_channel(struct s6000_i2s_dev *dev, int channel)
+{
+        int i, j, cur, prev;
+
+        /*
+         * Wait for WCLK to toggle 5 times before enabling the channel
+         * s6000 Family Datasheet 3.6.4:
+         *   "At least two cycles of WS must occur between commands
+         *    to disable or enable the interface"
+         */
+        j = 0;
+        prev = ~S6_I2S_CUR_WS;
+        for (i = 1000000; --i && j < 6; ) {
+                cur = s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(channel))
+                       & S6_I2S_CUR_WS;
+                if (prev != cur) {
+                        prev = cur;
+                        j++;
+                }
+        }
+        if (j < 6)
+                printk(KERN_WARNING "s6000-i2s: timeout waiting for WCLK\n");
+
+        s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_ENABLE_IF);
+}
+
+static void s6000_i2s_stop_channel(struct s6000_i2s_dev *dev, int channel)
+{
+        s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_DISABLE_IF);
+}
+
+static void s6000_i2s_start(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
+        int channel;
+
+        channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+                        dev->channel_out : dev->channel_in;
+
+        s6000_i2s_start_channel(dev, channel);
+}
+
+static void s6000_i2s_stop(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct s6000_i2s_dev *dev = rtd->dai->cpu_dai->private_data;
+        int channel;
+
+        channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+                        dev->channel_out : dev->channel_in;
+
+        s6000_i2s_stop_channel(dev, channel);
+}
+
+static int s6000_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+                             int after)
+{
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                if ((substream->stream == SNDRV_PCM_STREAM_CAPTURE) ^ !after)
+                        s6000_i2s_start(substream);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                if (!after)
+                        s6000_i2s_stop(substream);
+        }
+        return 0;
+}
+
+static unsigned int s6000_i2s_int_sources(struct s6000_i2s_dev *dev)
+{
+        unsigned int pending;
+        pending = s6_i2s_read_reg(dev, S6_I2S_INTERRUPT_RAW);
+        pending &= S6_I2S_INT_ALIGNMENT |
+                   S6_I2S_INT_UNDERRUN |
+                   S6_I2S_INT_OVERRUN;
+        s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR, pending);
+
+        return pending;
+}
+
+static unsigned int s6000_i2s_check_xrun(struct snd_soc_dai *cpu_dai)
+{
+        struct s6000_i2s_dev *dev = cpu_dai->private_data;
+        unsigned int errors;
+        unsigned int ret;
+
+        errors = s6000_i2s_int_sources(dev);
+        if (likely(!errors))
+                return 0;
+
+        ret = 0;
+        if (errors & S6_I2S_INT_ALIGNMENT)
+                printk(KERN_ERR "s6000-i2s: WCLK misaligned\n");
+        if (errors & S6_I2S_INT_UNDERRUN)
+                ret |= 1 << SNDRV_PCM_STREAM_PLAYBACK;
+        if (errors & S6_I2S_INT_OVERRUN)
+                ret |= 1 << SNDRV_PCM_STREAM_CAPTURE;
+        return ret;
+}
+
+static void s6000_i2s_wait_disabled(struct s6000_i2s_dev *dev)
+{
+        int channel;
+        int n = 50;
+        for (channel = 0; channel < 2; channel++) {
+                while (--n >= 0) {
+                        int v = s6_i2s_read_reg(dev, S6_I2S_ENABLE(channel));
+                        if ((v & S6_I2S_IS_ENABLED)
+                            || !(v & (S6_I2S_DMA_ACTIVE | S6_I2S_IS_BUSY)))
+                                break;
+                        udelay(20);
+                }
+        }
+        if (n < 0)
+                printk(KERN_WARNING "s6000-i2s: timeout disabling interfaces");
+}
+
+static int s6000_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
+                                   unsigned int fmt)
+{
+        struct s6000_i2s_dev *dev = cpu_dai->private_data;
+        u32 w;
+
+        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBM_CFM:
+                w = S6_I2S_SCK_IN | S6_I2S_WS_IN;
+                break;
+        case SND_SOC_DAIFMT_CBS_CFM:
+                w = S6_I2S_SCK_OUT | S6_I2S_WS_IN;
+                break;
+        case SND_SOC_DAIFMT_CBM_CFS:
+                w = S6_I2S_SCK_IN | S6_I2S_WS_OUT;
+                break;
+        case SND_SOC_DAIFMT_CBS_CFS:
+                w = S6_I2S_SCK_OUT | S6_I2S_WS_OUT;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+        case SND_SOC_DAIFMT_IB_IF:
+                w |= S6_I2S_LEFT_FIRST;
+                break;
+        case SND_SOC_DAIFMT_IB_NF:
+                w |= S6_I2S_RIGHT_FIRST;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(0),
+                       S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
+        s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(1),
+                       S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
+
+        return 0;
+}
+
+static int s6000_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
+{
+        struct s6000_i2s_dev *dev = dai->private_data;
+
+        if (!div || (div & 1) || div > (S6_I2S_DIV_MASK + 1) * 2)
+                return -EINVAL;
+
+        s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(div_id),
+                       S6_I2S_DIV_MASK, div / 2 - 1);
+        return 0;
+}
+
+static int s6000_i2s_hw_params(struct snd_pcm_substream *substream,
+                               struct snd_pcm_hw_params *params,
+                               struct snd_soc_dai *dai)
+{
+        struct s6000_i2s_dev *dev = dai->private_data;
+        int interf;
+        u32 w = 0;
+
+        if (dev->wide)
+                interf = 0;
+        else {
+                w |= (((params_channels(params) - 2) / 2)
+                      << S6_I2S_CHANNELS_SHIFT) & S6_I2S_CHANNELS_MASK;
+                interf = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                                ? dev->channel_out : dev->channel_in;
+        }
+
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                w |= S6_I2S_16BIT | S6_I2S_MEM_16BIT;
+                break;
+        case SNDRV_PCM_FORMAT_S32_LE:
+                w |= S6_I2S_32BIT | S6_I2S_MEM_32BIT;
+                break;
+        default:
+                printk(KERN_WARNING "s6000-i2s: unsupported PCM format %x\n",
+                       params_format(params));
+                return -EINVAL;
+        }
+
+        if (s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(interf))
+             & S6_I2S_IS_ENABLED) {
+                printk(KERN_ERR "s6000-i2s: interface already enabled\n");
+                return -EBUSY;
+        }
+
+        s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(interf),
+                       S6_I2S_CHANNELS_MASK|S6_I2S_MEM_MASK|S6_I2S_BITS_MASK,
+                       w);
+
+        return 0;
+}
+
+static int s6000_i2s_dai_probe(struct platform_device *pdev,
+                               struct snd_soc_dai *dai)
+{
+        struct s6000_i2s_dev *dev = dai->private_data;
+        struct s6000_snd_platform_data *pdata = pdev->dev.platform_data;
+
+        if (!pdata)
+                return -EINVAL;
+
+        dev->wide = pdata->wide;
+        dev->channel_in = pdata->channel_in;
+        dev->channel_out = pdata->channel_out;
+        dev->lines_in = pdata->lines_in;
+        dev->lines_out = pdata->lines_out;
+
+        s6_i2s_write_reg(dev, S6_I2S_MODE,
+                         dev->wide ? S6_I2S_WIDE : S6_I2S_DUAL);
+
+        if (dev->wide) {
+                int i;
+
+                if (dev->lines_in + dev->lines_out > S6_I2S_NUM_LINES)
+                        return -EINVAL;
+
+                dev->channel_in = 0;
+                dev->channel_out = 1;
+                dai->capture.channels_min = 2 * dev->lines_in;
+                dai->capture.channels_max = dai->capture.channels_min;
+                dai->playback.channels_min = 2 * dev->lines_out;
+                dai->playback.channels_max = dai->playback.channels_min;
+
+                for (i = 0; i < dev->lines_out; i++)
+                        s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_OUT);
+
+                for (; i < S6_I2S_NUM_LINES - dev->lines_in; i++)
+                        s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i),
+                                         S6_I2S_UNUSED);
+
+                for (; i < S6_I2S_NUM_LINES; i++)
+                        s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_IN);
+        } else {
+                unsigned int cfg[2] = {S6_I2S_UNUSED, S6_I2S_UNUSED};
+
+                if (dev->lines_in > 1 || dev->lines_out > 1)
+                        return -EINVAL;
+
+                dai->capture.channels_min = 2 * dev->lines_in;
+                dai->capture.channels_max = 8 * dev->lines_in;
+                dai->playback.channels_min = 2 * dev->lines_out;
+                dai->playback.channels_max = 8 * dev->lines_out;
+
+                if (dev->lines_in)
+                        cfg[dev->channel_in] = S6_I2S_IN;
+                if (dev->lines_out)
+                        cfg[dev->channel_out] = S6_I2S_OUT;
+
+                s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(0), cfg[0]);
+                s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(1), cfg[1]);
+        }
+
+        if (dev->lines_out) {
+                if (dev->lines_in) {
+                        if (!dev->dma_params.dma_out)
+                                return -ENODEV;
+                } else {
+                        dev->dma_params.dma_out = dev->dma_params.dma_in;
+                        dev->dma_params.dma_in = 0;
+                }
+        }
+        dev->dma_params.sif_in = dev->sifbase + (dev->channel_in ?
+                                        S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
+        dev->dma_params.sif_out = dev->sifbase + (dev->channel_out ?
+                                        S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
+        dev->dma_params.same_rate = pdata->same_rate | pdata->wide;
+        return 0;
+}
+
+#define S6000_I2S_RATES (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
+                         SNDRV_PCM_RATE_8000_192000)
+#define S6000_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_ops s6000_i2s_dai_ops = {
+        .set_fmt = s6000_i2s_set_dai_fmt,
+        .set_clkdiv = s6000_i2s_set_clkdiv,
+        .hw_params = s6000_i2s_hw_params,
+};
+
+struct snd_soc_dai s6000_i2s_dai = {
+        .name = "s6000-i2s",
+        .id = 0,
+        .probe = s6000_i2s_dai_probe,
+        .playback = {
+                .channels_min = 2,
+                .channels_max = 8,
+                .formats = S6000_I2S_FORMATS,
+                .rates = S6000_I2S_RATES,
+                .rate_min = 0,
+                .rate_max = 1562500,
+        },
+        .capture = {
+                .channels_min = 2,
+                .channels_max = 8,
+                .formats = S6000_I2S_FORMATS,
+                .rates = S6000_I2S_RATES,
+                .rate_min = 0,
+                .rate_max = 1562500,
+        },
+        .ops = &s6000_i2s_dai_ops,
+}
+EXPORT_SYMBOL_GPL(s6000_i2s_dai);
+
+static int __devinit s6000_i2s_probe(struct platform_device *pdev)
+{
+        struct s6000_i2s_dev *dev;
+        struct resource *scbmem, *sifmem, *region, *dma1, *dma2;
+        u8 __iomem *mmio;
+        int ret;
+
+        scbmem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!scbmem) {
+                dev_err(&pdev->dev, "no mem resource?\n");
+                ret = -ENODEV;
+                goto err_release_none;
+        }
+
+        region = request_mem_region(scbmem->start,
+                                    scbmem->end - scbmem->start + 1,
+                                    pdev->name);
+        if (!region) {
+                dev_err(&pdev->dev, "I2S SCB region already claimed\n");
+                ret = -EBUSY;
+                goto err_release_none;
+        }
+
+        mmio = ioremap(scbmem->start, scbmem->end - scbmem->start + 1);
+        if (!mmio) {
+                dev_err(&pdev->dev, "can't ioremap SCB region\n");
+                ret = -ENOMEM;
+                goto err_release_scb;
+        }
+
+        sifmem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        if (!sifmem) {
+                dev_err(&pdev->dev, "no second mem resource?\n");
+                ret = -ENODEV;
+                goto err_release_map;
+        }
+
+        region = request_mem_region(sifmem->start,
+                                    sifmem->end - sifmem->start + 1,
+                                    pdev->name);
+        if (!region) {
+                dev_err(&pdev->dev, "I2S SIF region already claimed\n");
+                ret = -EBUSY;
+                goto err_release_map;
+        }
+
+        dma1 = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+        if (!dma1) {
+                dev_err(&pdev->dev, "no dma resource?\n");
+                ret = -ENODEV;
+                goto err_release_sif;
+        }
+
+        region = request_mem_region(dma1->start, dma1->end - dma1->start + 1,
+                                    pdev->name);
+        if (!region) {
+                dev_err(&pdev->dev, "I2S DMA region already claimed\n");
+                ret = -EBUSY;
+                goto err_release_sif;
+        }
+
+        dma2 = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+        if (dma2) {
+                region = request_mem_region(dma2->start,
+                                            dma2->end - dma2->start + 1,
+                                            pdev->name);
+                if (!region) {
+                        dev_err(&pdev->dev,
+                                "I2S DMA region already claimed\n");
+                        ret = -EBUSY;
+                        goto err_release_dma1;
+                }
+        }
+
+        dev = kzalloc(sizeof(struct s6000_i2s_dev), GFP_KERNEL);
+        if (!dev) {
+                ret = -ENOMEM;
+                goto err_release_dma2;
+        }
+
+        s6000_i2s_dai.dev = &pdev->dev;
+        s6000_i2s_dai.private_data = dev;
+        s6000_i2s_dai.dma_data = &dev->dma_params;
+
+        dev->sifbase = sifmem->start;
+        dev->scbbase = mmio;
+
+        s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
+        s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR,
+                         S6_I2S_INT_ALIGNMENT |
+                         S6_I2S_INT_UNDERRUN |
+                         S6_I2S_INT_OVERRUN);
+
+        s6000_i2s_stop_channel(dev, 0);
+        s6000_i2s_stop_channel(dev, 1);
+        s6000_i2s_wait_disabled(dev);
+
+        dev->dma_params.check_xrun = s6000_i2s_check_xrun;
+        dev->dma_params.trigger = s6000_i2s_trigger;
+        dev->dma_params.dma_in = dma1->start;
+        dev->dma_params.dma_out = dma2 ? dma2->start : 0;
+        dev->dma_params.irq = platform_get_irq(pdev, 0);
+        if (dev->dma_params.irq < 0) {
+                dev_err(&pdev->dev, "no irq resource?\n");
+                ret = -ENODEV;
+                goto err_release_dev;
+        }
+
+        s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE,
+                         S6_I2S_INT_ALIGNMENT |
+                         S6_I2S_INT_UNDERRUN |
+                         S6_I2S_INT_OVERRUN);
+
+        ret = snd_soc_register_dai(&s6000_i2s_dai);
+        if (ret)
+                goto err_release_dev;
+
+        return 0;
+
+err_release_dev:
+        kfree(dev);
+err_release_dma2:
+        if (dma2)
+                release_mem_region(dma2->start, dma2->end - dma2->start + 1);
+err_release_dma1:
+        release_mem_region(dma1->start, dma1->end - dma1->start + 1);
+err_release_sif:
+        release_mem_region(sifmem->start, (sifmem->end - sifmem->start) + 1);
+err_release_map:
+        iounmap(mmio);
+err_release_scb:
+        release_mem_region(scbmem->start, (scbmem->end - scbmem->start) + 1);
+err_release_none:
+        return ret;
+}
+
+static void __devexit s6000_i2s_remove(struct platform_device *pdev)
+{
+        struct s6000_i2s_dev *dev = s6000_i2s_dai.private_data;
+        struct resource *region;
+        void __iomem *mmio = dev->scbbase;
+
+        snd_soc_unregister_dai(&s6000_i2s_dai);
+
+        s6000_i2s_stop_channel(dev, 0);
+        s6000_i2s_stop_channel(dev, 1);
+
+        s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
+        s6000_i2s_dai.private_data = 0;
+        kfree(dev);
+
+        region = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+        release_mem_region(region->start, region->end - region->start + 1);
+
+        region = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+        if (region)
+                release_mem_region(region->start,
+                                   region->end - region->start + 1);
+
+        region = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        release_mem_region(region->start, (region->end - region->start) + 1);
+
+        iounmap(mmio);
+        region = platform_get_resource(pdev, IORESOURCE_IO, 0);
+        release_mem_region(region->start, (region->end - region->start) + 1);
+}
+
+static struct platform_driver s6000_i2s_driver = {
+        .probe  = s6000_i2s_probe,
+        .remove = __devexit_p(s6000_i2s_remove),
+        .driver = {
+                .name   = "s6000-i2s",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init s6000_i2s_init(void)
+{
+        return platform_driver_register(&s6000_i2s_driver);
+}
+module_init(s6000_i2s_init);
+
+static void __exit s6000_i2s_exit(void)
+{
+        platform_driver_unregister(&s6000_i2s_driver);
+}
+module_exit(s6000_i2s_exit);
+
+MODULE_AUTHOR("Daniel Gloeckner");
+MODULE_DESCRIPTION("Stretch s6000 family I2S SoC Interface");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/s6000/s6000-i2s.h b/sound/soc/s6000/s6000-i2s.h
new file mode 100644
index 000000000000..2375fdfe6dba
--- /dev/null
+++ b/sound/soc/s6000/s6000-i2s.h
@@ -0,0 +1,25 @@
+/*
+ * ALSA SoC I2S Audio Layer for the Stretch s6000 family
+ *
+ * Author:      Daniel Gloeckner, <dg@emlix.com>
+ * Copyright:   (C) 2009 emlix GmbH <info@emlix.com>
+ *
+ * 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.
+ */
+
+#ifndef _S6000_I2S_H
+#define _S6000_I2S_H
+
+extern struct snd_soc_dai s6000_i2s_dai;
+
+struct s6000_snd_platform_data {
+        int lines_in;
+        int lines_out;
+        int channel_in;
+        int channel_out;
+        int wide;
+        int same_rate;
+};
+#endif
diff --git a/sound/soc/s6000/s6000-pcm.c b/sound/soc/s6000/s6000-pcm.c
new file mode 100644
index 000000000000..83b8028e209d
--- /dev/null
+++ b/sound/soc/s6000/s6000-pcm.c
@@ -0,0 +1,497 @@
+/*
+ * ALSA PCM interface for the Stetch s6000 family
+ *
+ * Author:      Daniel Gloeckner, <dg@emlix.com>
+ * Copyright:   (C) 2009 emlix GmbH <info@emlix.com>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/dma.h>
+#include <variant/dmac.h>
+
+#include "s6000-pcm.h"
+
+#define S6_PCM_PREALLOCATE_SIZE (96 * 1024)
+#define S6_PCM_PREALLOCATE_MAX  (2048 * 1024)
+
+static struct snd_pcm_hardware s6000_pcm_hardware = {
+        .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+                 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_JOINT_DUPLEX),
+        .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE),
+        .rates = (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
+                  SNDRV_PCM_RATE_8000_192000),
+        .rate_min = 0,
+        .rate_max = 1562500,
+        .channels_min = 2,
+        .channels_max = 8,
+        .buffer_bytes_max = 0x7ffffff0,
+        .period_bytes_min = 16,
+        .period_bytes_max = 0xfffff0,
+        .periods_min = 2,
+        .periods_max = 1024, /* no limit */
+        .fifo_size = 0,
+};
+
+struct s6000_runtime_data {
+        spinlock_t lock;
+        int period;             /* current DMA period */
+};
+
+static void s6000_pcm_enqueue_dma(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct s6000_runtime_data *prtd = runtime->private_data;
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+        int channel;
+        unsigned int period_size;
+        unsigned int dma_offset;
+        dma_addr_t dma_pos;
+        dma_addr_t src, dst;
+
+        period_size = snd_pcm_lib_period_bytes(substream);
+        dma_offset = prtd->period * period_size;
+        dma_pos = runtime->dma_addr + dma_offset;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                src = dma_pos;
+                dst = par->sif_out;
+                channel = par->dma_out;
+        } else {
+                src = par->sif_in;
+                dst = dma_pos;
+                channel = par->dma_in;
+        }
+
+        if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
+                                    DMA_INDEX_CHNL(channel)))
+                return;
+
+        if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
+                printk(KERN_ERR "s6000-pcm: fifo full\n");
+                return;
+        }
+
+        BUG_ON(period_size & 15);
+        s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
+                        src, dst, period_size);
+
+        prtd->period++;
+        if (unlikely(prtd->period >= runtime->periods))
+                prtd->period = 0;
+}
+
+static irqreturn_t s6000_pcm_irq(int irq, void *data)
+{
+        struct snd_pcm *pcm = data;
+        struct snd_soc_pcm_runtime *runtime = pcm->private_data;
+        struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
+        struct s6000_runtime_data *prtd;
+        unsigned int has_xrun;
+        int i, ret = IRQ_NONE;
+        u32 channel[2] = {
+                [SNDRV_PCM_STREAM_PLAYBACK] = params->dma_out,
+                [SNDRV_PCM_STREAM_CAPTURE] = params->dma_in
+        };
+
+        has_xrun = params->check_xrun(runtime->dai->cpu_dai);
+
+        for (i = 0; i < ARRAY_SIZE(channel); ++i) {
+                struct snd_pcm_substream *substream = pcm->streams[i].substream;
+                unsigned int pending;
+
+                if (!channel[i])
+                        continue;
+
+                if (unlikely(has_xrun & (1 << i)) &&
+                    substream->runtime &&
+                    snd_pcm_running(substream)) {
+                        dev_dbg(pcm->dev, "xrun\n");
+                        snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+                        ret = IRQ_HANDLED;
+                }
+
+                pending = s6dmac_int_sources(DMA_MASK_DMAC(channel[i]),
+                                             DMA_INDEX_CHNL(channel[i]));
+
+                if (pending & 1) {
+                        ret = IRQ_HANDLED;
+                        if (likely(substream->runtime &&
+                                   snd_pcm_running(substream))) {
+                                snd_pcm_period_elapsed(substream);
+                                dev_dbg(pcm->dev, "period elapsed %x %x\n",
+                                       s6dmac_cur_src(DMA_MASK_DMAC(channel[i]),
+                                                   DMA_INDEX_CHNL(channel[i])),
+                                       s6dmac_cur_dst(DMA_MASK_DMAC(channel[i]),
+                                                   DMA_INDEX_CHNL(channel[i])));
+                                prtd = substream->runtime->private_data;
+                                spin_lock(&prtd->lock);
+                                s6000_pcm_enqueue_dma(substream);
+                                spin_unlock(&prtd->lock);
+                        }
+                }
+
+                if (unlikely(pending & ~7)) {
+                        if (pending & (1 << 3))
+                                printk(KERN_WARNING
+                                       "s6000-pcm: DMA %x Underflow\n",
+                                       channel[i]);
+                        if (pending & (1 << 4))
+                                printk(KERN_WARNING
+                                       "s6000-pcm: DMA %x Overflow\n",
+                                       channel[i]);
+                        if (pending & 0x1e0)
+                                printk(KERN_WARNING
+                                       "s6000-pcm: DMA %x Master Error "
+                                       "(mask %x)\n",
+                                       channel[i], pending >> 5);
+
+                }
+        }
+
+        return ret;
+}
+
+static int s6000_pcm_start(struct snd_pcm_substream *substream)
+{
+        struct s6000_runtime_data *prtd = substream->runtime->private_data;
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+        unsigned long flags;
+        int srcinc;
+        u32 dma;
+
+        spin_lock_irqsave(&prtd->lock, flags);
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                srcinc = 1;
+                dma = par->dma_out;
+        } else {
+                srcinc = 0;
+                dma = par->dma_in;
+        }
+        s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
+                           1 /* priority 1 (0 is max) */,
+                           0 /* peripheral requests w/o xfer length mode */,
+                           srcinc /* source address increment */,
+                           srcinc^1 /* destination address increment */,
+                           0 /* chunksize 0 (skip impossible on this dma) */,
+                           0 /* source skip after chunk (impossible) */,
+                           0 /* destination skip after chunk (impossible) */,
+                           4 /* 16 byte burst size */,
+                           -1 /* don't conserve bandwidth */,
+                           0 /* low watermark irq descriptor theshold */,
+                           0 /* disable hardware timestamps */,
+                           1 /* enable channel */);
+
+        s6000_pcm_enqueue_dma(substream);
+        s6000_pcm_enqueue_dma(substream);
+
+        spin_unlock_irqrestore(&prtd->lock, flags);
+
+        return 0;
+}
+
+static int s6000_pcm_stop(struct snd_pcm_substream *substream)
+{
+        struct s6000_runtime_data *prtd = substream->runtime->private_data;
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+        unsigned long flags;
+        u32 channel;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                channel = par->dma_out;
+        else
+                channel = par->dma_in;
+
+        s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
+                                  DMA_INDEX_CHNL(channel), 0);
+
+        spin_lock_irqsave(&prtd->lock, flags);
+
+        s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
+
+        spin_unlock_irqrestore(&prtd->lock, flags);
+
+        return 0;
+}
+
+static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+        int ret;
+
+        ret = par->trigger(substream, cmd, 0);
+        if (ret < 0)
+                return ret;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                ret = s6000_pcm_start(substream);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                ret = s6000_pcm_stop(substream);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+        if (ret < 0)
+                return ret;
+
+        return par->trigger(substream, cmd, 1);
+}
+
+static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
+{
+        struct s6000_runtime_data *prtd = substream->runtime->private_data;
+
+        prtd->period = 0;
+
+        return 0;
+}
+
+static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct s6000_runtime_data *prtd = runtime->private_data;
+        unsigned long flags;
+        unsigned int offset;
+        dma_addr_t count;
+
+        spin_lock_irqsave(&prtd->lock, flags);
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
+                                       DMA_INDEX_CHNL(par->dma_out));
+        else
+                count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
+                                       DMA_INDEX_CHNL(par->dma_in));
+
+        count -= runtime->dma_addr;
+
+        spin_unlock_irqrestore(&prtd->lock, flags);
+
+        offset = bytes_to_frames(runtime, count);
+        if (unlikely(offset >= runtime->buffer_size))
+                offset = 0;
+
+        return offset;
+}
+
+static int s6000_pcm_open(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct s6000_runtime_data *prtd;
+        int ret;
+
+        snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
+
+        ret = snd_pcm_hw_constraint_step(runtime, 0,
+                                         SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
+        if (ret < 0)
+                return ret;
+        ret = snd_pcm_hw_constraint_step(runtime, 0,
+                                         SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
+        if (ret < 0)
+                return ret;
+        ret = snd_pcm_hw_constraint_integer(runtime,
+                                            SNDRV_PCM_HW_PARAM_PERIODS);
+        if (ret < 0)
+                return ret;
+
+        if (par->same_rate) {
+                int rate;
+                spin_lock(&par->lock); /* needed? */
+                rate = par->rate;
+                spin_unlock(&par->lock);
+                if (rate != -1) {
+                        ret = snd_pcm_hw_constraint_minmax(runtime,
+                                                        SNDRV_PCM_HW_PARAM_RATE,
+                                                        rate, rate);
+                        if (ret < 0)
+                                return ret;
+                }
+        }
+
+        prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
+        if (prtd == NULL)
+                return -ENOMEM;
+
+        spin_lock_init(&prtd->lock);
+
+        runtime->private_data = prtd;
+
+        return 0;
+}
+
+static int s6000_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct s6000_runtime_data *prtd = runtime->private_data;
+
+        kfree(prtd);
+
+        return 0;
+}
+
+static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
+                                 struct snd_pcm_hw_params *hw_params)
+{
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+        int ret;
+        ret = snd_pcm_lib_malloc_pages(substream,
+                                       params_buffer_bytes(hw_params));
+        if (ret < 0) {
+                printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
+                return ret;
+        }
+
+        if (par->same_rate) {
+                spin_lock(&par->lock);
+                if (par->rate == -1 ||
+                    !(par->in_use & ~(1 << substream->stream))) {
+                        par->rate = params_rate(hw_params);
+                        par->in_use |= 1 << substream->stream;
+                } else if (params_rate(hw_params) != par->rate) {
+                        snd_pcm_lib_free_pages(substream);
+                        par->in_use &= ~(1 << substream->stream);
+                        ret = -EBUSY;
+                }
+                spin_unlock(&par->lock);
+        }
+        return ret;
+}
+
+static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
+        struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
+
+        spin_lock(&par->lock);
+        par->in_use &= ~(1 << substream->stream);
+        if (!par->in_use)
+                par->rate = -1;
+        spin_unlock(&par->lock);
+
+        return snd_pcm_lib_free_pages(substream);
+}
+
+static struct snd_pcm_ops s6000_pcm_ops = {
+        .open =         s6000_pcm_open,
+        .close =        s6000_pcm_close,
+        .ioctl =        snd_pcm_lib_ioctl,
+        .hw_params =    s6000_pcm_hw_params,
+        .hw_free =      s6000_pcm_hw_free,
+        .trigger =      s6000_pcm_trigger,
+        .prepare =      s6000_pcm_prepare,
+        .pointer =      s6000_pcm_pointer,
+};
+
+static void s6000_pcm_free(struct snd_pcm *pcm)
+{
+        struct snd_soc_pcm_runtime *runtime = pcm->private_data;
+        struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
+
+        free_irq(params->irq, pcm);
+        snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static u64 s6000_pcm_dmamask = DMA_32BIT_MASK;
+
+static int s6000_pcm_new(struct snd_card *card,
+                         struct snd_soc_dai *dai, struct snd_pcm *pcm)
+{
+        struct snd_soc_pcm_runtime *runtime = pcm->private_data;
+        struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
+        int res;
+
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &s6000_pcm_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = DMA_32BIT_MASK;
+
+        if (params->dma_in) {
+                s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
+                                    DMA_INDEX_CHNL(params->dma_in));
+                s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
+                                   DMA_INDEX_CHNL(params->dma_in));
+        }
+
+        if (params->dma_out) {
+                s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
+                                    DMA_INDEX_CHNL(params->dma_out));
+                s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
+                                   DMA_INDEX_CHNL(params->dma_out));
+        }
+
+        res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
+                          s6000_soc_platform.name, pcm);
+        if (res) {
+                printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
+                return res;
+        }
+
+        res = snd_pcm_lib_preallocate_pages_for_all(pcm,
+                                                    SNDRV_DMA_TYPE_DEV,
+                                                    card->dev,
+                                                    S6_PCM_PREALLOCATE_SIZE,
+                                                    S6_PCM_PREALLOCATE_MAX);
+        if (res)
+                printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
+
+        spin_lock_init(&params->lock);
+        params->in_use = 0;
+        params->rate = -1;
+        return 0;
+}
+
+struct snd_soc_platform s6000_soc_platform = {
+        .name =         "s6000-audio",
+        .pcm_ops =      &s6000_pcm_ops,
+        .pcm_new =      s6000_pcm_new,
+        .pcm_free =     s6000_pcm_free,
+};
+EXPORT_SYMBOL_GPL(s6000_soc_platform);
+
+static int __init s6000_pcm_init(void)
+{
+        return snd_soc_register_platform(&s6000_soc_platform);
+}
+module_init(s6000_pcm_init);
+
+static void __exit s6000_pcm_exit(void)
+{
+        snd_soc_unregister_platform(&s6000_soc_platform);
+}
+module_exit(s6000_pcm_exit);
+
+MODULE_AUTHOR("Daniel Gloeckner");
+MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/s6000/s6000-pcm.h b/sound/soc/s6000/s6000-pcm.h
new file mode 100644
index 000000000000..96f23f6f52bf
--- /dev/null
+++ b/sound/soc/s6000/s6000-pcm.h
@@ -0,0 +1,35 @@
+/*
+ * ALSA PCM interface for the Stretch s6000 family
+ *
+ * Author:      Daniel Gloeckner, <dg@emlix.com>
+ * Copyright:   (C) 2009 emlix GmbH <info@emlix.com>
+ *
+ * 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.
+ */
+
+#ifndef _S6000_PCM_H
+#define _S6000_PCM_H
+
+struct snd_soc_dai;
+struct snd_pcm_substream;
+
+struct s6000_pcm_dma_params {
+        unsigned int (*check_xrun)(struct snd_soc_dai *cpu_dai);
+        int (*trigger)(struct snd_pcm_substream *substream, int cmd, int after);
+        dma_addr_t sif_in;
+        dma_addr_t sif_out;
+        u32 dma_in;
+        u32 dma_out;
+        int irq;
+        int same_rate;
+
+        spinlock_t lock;
+        int in_use;
+        int rate;
+};
+
+extern struct snd_soc_platform s6000_soc_platform;
+
+#endif