ASoC: NUC900/audio: add nuc900 audio driver support

Add support for NUC900 AC97

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

8 files changed, 1036 insertions, 0 deletions

diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index b1749bc67979..6e04fc2aae4d 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -30,6 +30,7 @@ source "sound/soc/blackfin/Kconfig"
 source "sound/soc/davinci/Kconfig"
 source "sound/soc/fsl/Kconfig"
 source "sound/soc/imx/Kconfig"
+source "sound/soc/nuc900/Kconfig"
 source "sound/soc/omap/Kconfig"
 source "sound/soc/pxa/Kconfig"
 source "sound/soc/s3c24xx/Kconfig"
diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 1470141d4167..ccec241488a6 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_SND_SOC)	+= blackfin/
 obj-$(CONFIG_SND_SOC)   += davinci/
 obj-$(CONFIG_SND_SOC)   += fsl/
 obj-$(CONFIG_SND_SOC)   += imx/
+obj-$(CONFIG_SND_SOC)   += nuc900/
 obj-$(CONFIG_SND_SOC)   += omap/
 obj-$(CONFIG_SND_SOC)   += pxa/
 obj-$(CONFIG_SND_SOC)   += s3c24xx/
diff --git a/sound/soc/nuc900/Kconfig b/sound/soc/nuc900/Kconfig
new file mode 100644
index 000000000000..a0ed1c618f60
--- /dev/null
+++ b/sound/soc/nuc900/Kconfig
@@ -0,0 +1,27 @@
+##
+## NUC900 series AC97 API
+##
+config SND_SOC_NUC900
+        tristate "SoC Audio for NUC900 series"
+        depends on ARCH_W90X900
+        help
+          This option enables support for AC97 mode on the NUC900 SoC.
+
+config SND_SOC_NUC900_AC97
+        tristate
+        select AC97_BUS
+        select SND_AC97_CODEC
+        select SND_SOC_AC97_BUS
+
+
+##
+## Boards
+##
+config SND_SOC_NUC900EVB
+        tristate "NUC900 AC97 support for demo board"
+        depends on SND_SOC_NUC900
+        select SND_SOC_NUC900_AC97
+        select SND_SOC_AC97_CODEC
+        help
+          Select this option to enable audio (AC97) on the
+          NUC900 demoboard.
diff --git a/sound/soc/nuc900/Makefile b/sound/soc/nuc900/Makefile
new file mode 100644
index 000000000000..7e46c7150316
--- /dev/null
+++ b/sound/soc/nuc900/Makefile
@@ -0,0 +1,11 @@
+# NUC900 series audio
+snd-soc-nuc900-pcm-objs := nuc900-pcm.o
+snd-soc-nuc900-ac97-objs := nuc900-ac97.o
+
+obj-$(CONFIG_SND_SOC_NUC900) += snd-soc-nuc900-pcm.o
+obj-$(CONFIG_SND_SOC_NUC900_AC97) += snd-soc-nuc900-ac97.o
+
+# Boards
+snd-soc-nuc900-audio-objs := nuc900-audio.o
+
+obj-$(CONFIG_SND_SOC_NUC900EVB) += snd-soc-nuc900-audio.o
diff --git a/sound/soc/nuc900/nuc900-ac97.c b/sound/soc/nuc900/nuc900-ac97.c
new file mode 100644
index 000000000000..f7b44e081420
--- /dev/null
+++ b/sound/soc/nuc900/nuc900-ac97.c
@@ -0,0 +1,442 @@
+/*
+ * Copyright (c) 2009-2010 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/suspend.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+
+#include <mach/mfp.h>
+
+#include "nuc900-auido.h"
+
+static DEFINE_MUTEX(ac97_mutex);
+struct nuc900_audio *nuc900_ac97_data;
+
+static int nuc900_checkready(void)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+
+        if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
+                return -EPERM;
+
+        return 0;
+}
+
+/* AC97 controller reads codec register */
+static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
+                                        unsigned short reg)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long timeout = 0x10000, val;
+
+        mutex_lock(&ac97_mutex);
+
+        val = nuc900_checkready();
+        if (!!val) {
+                dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+                goto out;
+        }
+
+        /* set the R_WB bit and write register index */
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);
+
+        /* set the valid frame bit and valid slots */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+        val |= (VALID_FRAME | SLOT1_VALID);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
+
+        udelay(100);
+
+        /* polling the AC_R_FINISH */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        val &= AC_R_FINISH;
+        while (!val && timeout--)
+                mdelay(1);
+
+        if (!timeout) {
+                dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
+                val = -EPERM;
+                goto out;
+        }
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
+        val &= ~SLOT1_VALID;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
+
+        if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
+                dev_err(nuc900_audio->dev,
+                                "R_INDEX of REG_ACTL_ACIS1 not match!\n");
+        }
+
+        udelay(100);
+        val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
+
+out:
+        mutex_unlock(&ac97_mutex);
+        return val;
+}
+
+/* AC97 controller writes to codec register */
+static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+                                unsigned short val)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long tmp, timeout = 0x10000;
+
+        mutex_lock(&ac97_mutex);
+
+        tmp = nuc900_checkready();
+        if (!!tmp)
+                dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+
+        /* clear the R_WB bit and write register index */
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
+
+        /* write register value */
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
+
+        /* set the valid frame bit and valid slots */
+        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+        tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+        udelay(100);
+
+        /* polling the AC_W_FINISH */
+        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        tmp &= AC_W_FINISH;
+        while (tmp && timeout--)
+                mdelay(1);
+
+        if (!timeout)
+                dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
+
+        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+        tmp &= ~(SLOT1_VALID | SLOT2_VALID);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+        mutex_unlock(&ac97_mutex);
+
+}
+
+static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long val;
+
+        mutex_lock(&ac97_mutex);
+
+        /* warm reset AC 97 */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        val |= AC_W_RES;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+        udelay(1000);
+
+        val = nuc900_checkready();
+        if (!!val)
+                dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
+
+        mutex_unlock(&ac97_mutex);
+}
+
+static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long val;
+
+        mutex_lock(&ac97_mutex);
+
+        /* reset Audio Controller */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val |= ACTL_RESET_BIT;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        udelay(1000);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val &= (~ACTL_RESET_BIT);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        udelay(1000);
+
+        /* reset AC-link interface */
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val |= AC_RESET;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        udelay(1000);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+        val &= ~AC_RESET;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+        udelay(1000);
+
+        /* cold reset AC 97 */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        val |= AC_C_RES;
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+        udelay(1000);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
+        val &= (~AC_C_RES);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
+
+        udelay(1000);
+
+        mutex_unlock(&ac97_mutex);
+
+}
+
+/* AC97 controller operations */
+struct snd_ac97_bus_ops soc_ac97_ops = {
+        .read           = nuc900_ac97_read,
+        .write          = nuc900_ac97_write,
+        .reset          = nuc900_ac97_cold_reset,
+        .warm_reset     = nuc900_ac97_warm_reset,
+}
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
+                                int cmd, struct snd_soc_dai *dai)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        int ret, stype = SUBSTREAM_TYPE(substream);
+        unsigned long val, tmp;
+
+        ret = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+                val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+                if (PCM_TX == stype) {
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+                        tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
+                        tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
+                        val |= AC_PLAY;
+                } else {
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
+                        tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);
+
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
+                        val |= AC_RECORD;
+                }
+
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+                val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+                if (PCM_TX == stype) {
+                        tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
+                        tmp &= ~(SLOT3_VALID | SLOT4_VALID);
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
+
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
+                        val &= ~AC_PLAY;
+                } else {
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
+                        val &= ~AC_RECORD;
+                }
+
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+
+                break;
+        default:
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
+static int nuc900_ac97_probe(struct platform_device *pdev,
+                                        struct snd_soc_dai *dai)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+        unsigned long val;
+
+        mutex_lock(&ac97_mutex);
+
+        /* enable unit clock */
+        clk_enable(nuc900_audio->clk);
+
+        /* enable audio controller and AC-link interface */
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+        val |= (IIS_AC_PIN_SEL | ACLINK_EN);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
+
+        mutex_unlock(&ac97_mutex);
+
+        return 0;
+}
+
+static void nuc900_ac97_remove(struct platform_device *pdev,
+                                                struct snd_soc_dai *dai)
+{
+        struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
+
+        clk_disable(nuc900_audio->clk);
+}
+
+static struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
+        .trigger        = nuc900_ac97_trigger,
+};
+
+struct snd_soc_dai nuc900_ac97_dai = {
+        .name                   = "nuc900-ac97",
+        .probe                  = nuc900_ac97_probe,
+        .remove                 = nuc900_ac97_remove,
+        .ac97_control           = 1,
+        .playback = {
+                .rates          = SNDRV_PCM_RATE_8000_48000,
+                .formats        = SNDRV_PCM_FMTBIT_S16_LE,
+                .channels_min   = 1,
+                .channels_max   = 2,
+        },
+        .capture = {
+                .rates          = SNDRV_PCM_RATE_8000_48000,
+                .formats        = SNDRV_PCM_FMTBIT_S16_LE,
+                .channels_min   = 1,
+                .channels_max   = 2,
+        },
+        .ops = &nuc900_ac97_dai_ops,
+}
+EXPORT_SYMBOL_GPL(nuc900_ac97_dai);
+
+static int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev)
+{
+        struct nuc900_audio *nuc900_audio;
+        int ret;
+
+        if (nuc900_ac97_data)
+                return -EBUSY;
+
+        nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL);
+        if (!nuc900_audio)
+                return -ENOMEM;
+
+        spin_lock_init(&nuc900_audio->lock);
+
+        nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!nuc900_audio->res) {
+                ret = -ENODEV;
+                goto out0;
+        }
+
+        if (!request_mem_region(nuc900_audio->res->start,
+                        resource_size(nuc900_audio->res), pdev->name)) {
+                ret = -EBUSY;
+                goto out0;
+        }
+
+        nuc900_audio->mmio = ioremap(nuc900_audio->res->start,
+                                        resource_size(nuc900_audio->res));
+        if (!nuc900_audio->mmio) {
+                ret = -ENOMEM;
+                goto out1;
+        }
+
+        nuc900_audio->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(nuc900_audio->clk)) {
+                ret = PTR_ERR(nuc900_audio->clk);
+                goto out2;
+        }
+
+        nuc900_audio->irq_num = platform_get_irq(pdev, 0);
+        if (!nuc900_audio->irq_num) {
+                ret = -EBUSY;
+                goto out2;
+        }
+
+        nuc900_ac97_data = nuc900_audio;
+
+        nuc900_audio->dev = nuc900_ac97_dai.dev =  &pdev->dev;
+
+        ret = snd_soc_register_dai(&nuc900_ac97_dai);
+        if (ret)
+                goto out3;
+
+        mfp_set_groupg(nuc900_audio->dev); /* enbale ac97 multifunction pin*/
+
+        return 0;
+
+out3:
+        clk_put(nuc900_audio->clk);
+out2:
+        iounmap(nuc900_audio->mmio);
+out1:
+        release_mem_region(nuc900_audio->res->start,
+                                        resource_size(nuc900_audio->res));
+out0:
+        kfree(nuc900_audio);
+        return ret;
+}
+
+static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev)
+{
+
+        snd_soc_unregister_dai(&nuc900_ac97_dai);
+
+        clk_put(nuc900_ac97_data->clk);
+        iounmap(nuc900_ac97_data->mmio);
+        release_mem_region(nuc900_ac97_data->res->start,
+                                resource_size(nuc900_ac97_data->res));
+
+        nuc900_ac97_data = NULL;
+
+        return 0;
+}
+
+static struct platform_driver nuc900_ac97_driver = {
+        .driver = {
+                .name   = "nuc900-audio",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = nuc900_ac97_drvprobe,
+        .remove         = __devexit_p(nuc900_ac97_drvremove),
+};
+
+static int __init nuc900_ac97_init(void)
+{
+        return platform_driver_register(&nuc900_ac97_driver);
+}
+
+static void __exit nuc900_ac97_exit(void)
+{
+        platform_driver_unregister(&nuc900_ac97_driver);
+}
+
+module_init(nuc900_ac97_init);
+module_exit(nuc900_ac97_exit);
+
+MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:nuc900-ac97");
diff --git a/sound/soc/nuc900/nuc900-audio.c b/sound/soc/nuc900/nuc900-audio.c
new file mode 100644
index 000000000000..b33d5b844d71
--- /dev/null
+++ b/sound/soc/nuc900/nuc900-audio.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2010 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include "../codecs/ac97.h"
+#include "nuc900-auido.h"
+
+static struct snd_soc_dai_link nuc900evb_ac97_dai = {
+        .name           = "AC97",
+        .stream_name    = "AC97 HiFi",
+        .cpu_dai        = &nuc900_ac97_dai,
+        .codec_dai      = &ac97_dai,
+};
+
+static struct snd_soc_card nuc900evb_audio_machine = {
+        .name           = "NUC900EVB_AC97",
+        .dai_link       = &nuc900evb_ac97_dai,
+        .num_links      = 1,
+        .platform       = &nuc900_soc_platform,
+};
+
+static struct snd_soc_device nuc900evb_ac97_devdata = {
+        .card           = &nuc900evb_audio_machine,
+        .codec_dev      = &soc_codec_dev_ac97,
+};
+
+static struct platform_device *nuc900evb_asoc_dev;
+
+static int __init nuc900evb_audio_init(void)
+{
+        int ret;
+
+        ret = -ENOMEM;
+        nuc900evb_asoc_dev = platform_device_alloc("soc-audio", -1);
+        if (!nuc900evb_asoc_dev)
+                goto out;
+
+        /* nuc900 board audio device */
+        platform_set_drvdata(nuc900evb_asoc_dev, &nuc900evb_ac97_devdata);
+
+        nuc900evb_ac97_devdata.dev = &nuc900evb_asoc_dev->dev;
+        ret = platform_device_add(nuc900evb_asoc_dev);
+
+        if (ret) {
+                platform_device_put(nuc900evb_asoc_dev);
+                nuc900evb_asoc_dev = NULL;
+        }
+
+out:
+        return ret;
+}
+
+static void __exit nuc900evb_audio_exit(void)
+{
+        platform_device_unregister(nuc900evb_asoc_dev);
+}
+
+module_init(nuc900evb_audio_init);
+module_exit(nuc900evb_audio_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("NUC900 Series ASoC audio support");
+MODULE_AUTHOR("Wan ZongShun");
diff --git a/sound/soc/nuc900/nuc900-auido.h b/sound/soc/nuc900/nuc900-auido.h
new file mode 100644
index 000000000000..95ac4ef2f353
--- /dev/null
+++ b/sound/soc/nuc900/nuc900-auido.h
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2010 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#ifndef _NUC900_AUDIO_H
+#define _NUC900_AUDIO_H
+
+#include <linux/io.h>
+
+/* Audio Control Registers */
+#define ACTL_CON                0x00
+#define ACTL_RESET              0x04
+#define ACTL_RDSTB              0x08
+#define ACTL_RDST_LENGTH        0x0C
+#define ACTL_RDSTC              0x10
+#define ACTL_RSR                0x14
+#define ACTL_PDSTB              0x18
+#define ACTL_PDST_LENGTH        0x1C
+#define ACTL_PDSTC              0x20
+#define ACTL_PSR                0x24
+#define ACTL_IISCON             0x28
+#define ACTL_ACCON              0x2C
+#define ACTL_ACOS0              0x30
+#define ACTL_ACOS1              0x34
+#define ACTL_ACOS2              0x38
+#define ACTL_ACIS0              0x3C
+#define ACTL_ACIS1              0x40
+#define ACTL_ACIS2              0x44
+#define ACTL_COUNTER            0x48
+
+/* bit definition of REG_ACTL_CON register */
+#define R_DMA_IRQ               0x1000
+#define T_DMA_IRQ               0x0800
+#define IIS_AC_PIN_SEL          0x0100
+#define FIFO_TH                 0x0080
+#define ADC_EN                  0x0010
+#define M80_EN                  0x0008
+#define ACLINK_EN               0x0004
+#define IIS_EN                  0x0002
+
+/* bit definition of REG_ACTL_RESET register */
+#define W5691_PLAY              0x20000
+#define ACTL_RESET_BIT          0x10000
+#define RECORD_RIGHT_CHNNEL     0x08000
+#define RECORD_LEFT_CHNNEL      0x04000
+#define PLAY_RIGHT_CHNNEL       0x02000
+#define PLAY_LEFT_CHNNEL        0x01000
+#define DAC_PLAY                0x00800
+#define ADC_RECORD              0x00400
+#define M80_PLAY                0x00200
+#define AC_RECORD               0x00100
+#define AC_PLAY                 0x00080
+#define IIS_RECORD              0x00040
+#define IIS_PLAY                0x00020
+#define DAC_RESET               0x00010
+#define ADC_RESET               0x00008
+#define M80_RESET               0x00004
+#define AC_RESET                0x00002
+#define IIS_RESET               0x00001
+
+/* bit definition of REG_ACTL_ACCON register */
+#define AC_BCLK_PU_EN           0x20
+#define AC_R_FINISH             0x10
+#define AC_W_FINISH             0x08
+#define AC_W_RES                0x04
+#define AC_C_RES                0x02
+
+/* bit definition of ACTL_RSR register */
+#define R_FIFO_EMPTY            0x04
+#define R_DMA_END_IRQ           0x02
+#define R_DMA_MIDDLE_IRQ        0x01
+
+/* bit definition of ACTL_PSR register */
+#define P_FIFO_EMPTY            0x04
+#define P_DMA_END_IRQ           0x02
+#define P_DMA_MIDDLE_IRQ        0x01
+
+/* bit definition of ACTL_ACOS0 register */
+#define SLOT1_VALID             0x01
+#define SLOT2_VALID             0x02
+#define SLOT3_VALID             0x04
+#define SLOT4_VALID             0x08
+#define VALID_FRAME             0x10
+
+/* bit definition of ACTL_ACOS1 register */
+#define R_WB                    0x80
+
+#define CODEC_READY             0x10
+#define RESET_PRSR              0x00
+#define AUDIO_WRITE(addr, val)  __raw_writel(val, addr)
+#define AUDIO_READ(addr)        __raw_readl(addr)
+#define PCM_TX                  0
+#define PCM_RX                  1
+#define SUBSTREAM_TYPE(substream) \
+        ((substream)->stream == SNDRV_PCM_STREAM_PLAYBACK ? PCM_TX : PCM_RX)
+
+struct nuc900_audio {
+        void __iomem *mmio;
+        spinlock_t lock;
+        dma_addr_t dma_addr[2];
+        unsigned long buffersize[2];
+        unsigned long irq_num;
+        struct snd_pcm_substream *substream;
+        struct resource *res;
+        struct clk *clk;
+        struct device *dev;
+
+};
+
+extern struct nuc900_audio *nuc900_ac97_data;
+extern struct snd_soc_dai nuc900_ac97_dai;
+extern struct snd_soc_platform nuc900_soc_platform;
+
+#endif /*end _NUC900_AUDIO_H */
diff --git a/sound/soc/nuc900/nuc900-pcm.c b/sound/soc/nuc900/nuc900-pcm.c
new file mode 100644
index 000000000000..32a503c1c4be
--- /dev/null
+++ b/sound/soc/nuc900/nuc900-pcm.c
@@ -0,0 +1,352 @@
+/*
+ * Copyright (c) 2010 Nuvoton technology corporation.
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;version 2 of the License.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <mach/hardware.h>
+
+#include "nuc900-auido.h"
+
+static const struct snd_pcm_hardware nuc900_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_RESUME,
+        .formats                = SNDRV_PCM_FMTBIT_S16_LE,
+        .channels_min           = 1,
+        .channels_max           = 2,
+        .buffer_bytes_max       = 4*1024,
+        .period_bytes_min       = 1*1024,
+        .period_bytes_max       = 4*1024,
+        .periods_min            = 1,
+        .periods_max            = 1024,
+};
+
+static int nuc900_dma_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio = runtime->private_data;
+        unsigned long flags, stype = SUBSTREAM_TYPE(substream);
+        int ret = 0;
+
+        spin_lock_irqsave(&nuc900_audio->lock, flags);
+
+        ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
+        if (ret < 0)
+                return ret;
+
+        nuc900_audio->substream = substream;
+        nuc900_audio->dma_addr[stype] = runtime->dma_addr;
+        nuc900_audio->buffersize[stype] = params_buffer_bytes(params);
+
+        spin_unlock_irqrestore(&nuc900_audio->lock, flags);
+
+        return ret;
+}
+
+static void nuc900_update_dma_register(struct snd_pcm_substream *substream,
+                                dma_addr_t dma_addr, size_t count)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio = runtime->private_data;
+        void __iomem *mmio_addr, *mmio_len;
+
+        if (SUBSTREAM_TYPE(substream) == PCM_TX) {
+                mmio_addr = nuc900_audio->mmio + ACTL_PDSTB;
+                mmio_len = nuc900_audio->mmio + ACTL_PDST_LENGTH;
+        } else {
+                mmio_addr = nuc900_audio->mmio + ACTL_RDSTB;
+                mmio_len = nuc900_audio->mmio + ACTL_RDST_LENGTH;
+        }
+
+        AUDIO_WRITE(mmio_addr, dma_addr);
+        AUDIO_WRITE(mmio_len, count);
+}
+
+static void nuc900_dma_start(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio = runtime->private_data;
+        unsigned long val;
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+        val |= (T_DMA_IRQ | R_DMA_IRQ);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
+}
+
+static void nuc900_dma_stop(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio = runtime->private_data;
+        unsigned long val;
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+        val &= ~(T_DMA_IRQ | R_DMA_IRQ);
+        AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
+}
+
+static irqreturn_t nuc900_dma_interrupt(int irq, void *dev_id)
+{
+        struct snd_pcm_substream *substream = dev_id;
+        struct nuc900_audio *nuc900_audio = substream->runtime->private_data;
+        unsigned long val;
+
+        spin_lock(&nuc900_audio->lock);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
+
+        if (val & R_DMA_IRQ) {
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | R_DMA_IRQ);
+
+                val = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
+
+                if (val & R_DMA_MIDDLE_IRQ) {
+                        val |= R_DMA_MIDDLE_IRQ;
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
+                }
+
+                if (val & R_DMA_END_IRQ) {
+                        val |= R_DMA_END_IRQ;
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, val);
+                }
+        } else if (val & T_DMA_IRQ) {
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val | T_DMA_IRQ);
+
+                val = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
+
+                if (val & P_DMA_MIDDLE_IRQ) {
+                        val |= P_DMA_MIDDLE_IRQ;
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
+                }
+
+                if (val & P_DMA_END_IRQ) {
+                        val |= P_DMA_END_IRQ;
+                        AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, val);
+                }
+        } else {
+                dev_err(nuc900_audio->dev, "Wrong DMA interrupt status!\n");
+                spin_unlock(&nuc900_audio->lock);
+                return IRQ_HANDLED;
+        }
+
+        spin_unlock(&nuc900_audio->lock);
+
+        snd_pcm_period_elapsed(substream);
+
+        return IRQ_HANDLED;
+}
+
+static int nuc900_dma_hw_free(struct snd_pcm_substream *substream)
+{
+        snd_pcm_lib_free_pages(substream);
+        return 0;
+}
+
+static int nuc900_dma_prepare(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio = runtime->private_data;
+        unsigned long flags, val, stype = SUBSTREAM_TYPE(substream);;
+
+        spin_lock_irqsave(&nuc900_audio->lock, flags);
+
+        nuc900_update_dma_register(substream,
+                nuc900_audio->dma_addr[stype], nuc900_audio->buffersize[stype]);
+
+        val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
+
+        switch (runtime->channels) {
+        case 1:
+                if (PCM_TX == stype) {
+                        val &= ~(PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
+                        val |= PLAY_RIGHT_CHNNEL;
+                } else {
+                        val &= ~(RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
+                        val |= RECORD_RIGHT_CHNNEL;
+                }
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+                break;
+        case 2:
+                if (PCM_TX == stype)
+                        val |= (PLAY_LEFT_CHNNEL | PLAY_RIGHT_CHNNEL);
+                else
+                        val |= (RECORD_LEFT_CHNNEL | RECORD_RIGHT_CHNNEL);
+                AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
+                break;
+        default:
+                return -EINVAL;
+        }
+        spin_unlock_irqrestore(&nuc900_audio->lock, flags);
+        return 0;
+}
+
+static int nuc900_dma_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        int ret = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+                nuc900_dma_start(substream);
+                break;
+
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+                nuc900_dma_stop(substream);
+                break;
+
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+int nuc900_dma_getposition(struct snd_pcm_substream *substream,
+                                        dma_addr_t *src, dma_addr_t *dst)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio = runtime->private_data;
+
+        if (src != NULL)
+                *src = AUDIO_READ(nuc900_audio->mmio + ACTL_PDSTC);
+
+        if (dst != NULL)
+                *dst = AUDIO_READ(nuc900_audio->mmio + ACTL_RDSTC);
+
+        return 0;
+}
+
+static snd_pcm_uframes_t nuc900_dma_pointer(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        dma_addr_t src, dst;
+        unsigned long res;
+
+        nuc900_dma_getposition(substream, &src, &dst);
+
+        if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+                res = dst - runtime->dma_addr;
+        else
+                res = src - runtime->dma_addr;
+
+        return bytes_to_frames(substream->runtime, res);
+}
+
+static int nuc900_dma_open(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio;
+
+        snd_soc_set_runtime_hwparams(substream, &nuc900_pcm_hardware);
+
+        nuc900_audio = nuc900_ac97_data;
+
+        if (request_irq(nuc900_audio->irq_num, nuc900_dma_interrupt,
+                        IRQF_DISABLED, "nuc900-dma", substream))
+                return -EBUSY;
+
+        runtime->private_data = nuc900_audio;
+
+        return 0;
+}
+
+static int nuc900_dma_close(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct nuc900_audio *nuc900_audio = runtime->private_data;
+
+        free_irq(nuc900_audio->irq_num, substream);
+
+        return 0;
+}
+
+static int nuc900_dma_mmap(struct snd_pcm_substream *substream,
+        struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+
+        return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+                                        runtime->dma_area,
+                                        runtime->dma_addr,
+                                        runtime->dma_bytes);
+}
+
+static struct snd_pcm_ops nuc900_dma_ops = {
+        .open           = nuc900_dma_open,
+        .close          = nuc900_dma_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = nuc900_dma_hw_params,
+        .hw_free        = nuc900_dma_hw_free,
+        .prepare        = nuc900_dma_prepare,
+        .trigger        = nuc900_dma_trigger,
+        .pointer        = nuc900_dma_pointer,
+        .mmap           = nuc900_dma_mmap,
+};
+
+static void nuc900_dma_free_dma_buffers(struct snd_pcm *pcm)
+{
+        snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static u64 nuc900_pcm_dmamask = DMA_BIT_MASK(32);
+static int nuc900_dma_new(struct snd_card *card,
+        struct snd_soc_dai *dai, struct snd_pcm *pcm)
+{
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &nuc900_pcm_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+                card->dev, 4 * 1024, (4 * 1024) - 1);
+
+        return 0;
+}
+
+struct snd_soc_platform nuc900_soc_platform = {
+        .name           = "nuc900-dma",
+        .pcm_ops        = &nuc900_dma_ops,
+        .pcm_new        = nuc900_dma_new,
+        .pcm_free       = nuc900_dma_free_dma_buffers,
+}
+EXPORT_SYMBOL_GPL(nuc900_soc_platform);
+
+static int __init nuc900_soc_platform_init(void)
+{
+        return snd_soc_register_platform(&nuc900_soc_platform);
+}
+
+static void __exit nuc900_soc_platform_exit(void)
+{
+        snd_soc_unregister_platform(&nuc900_soc_platform);
+}
+
+module_init(nuc900_soc_platform_init);
+module_exit(nuc900_soc_platform_exit);
+
+MODULE_AUTHOR("Wan ZongShun, <mcuos.com@gmail.com>");
+MODULE_DESCRIPTION("nuc900 Audio DMA module");
+MODULE_LICENSE("GPL");