ASoC: AC97: S3C: Add controller driver

Add the AC97 controller driver for Samsung SoCs that have one.

Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

4 files changed, 548 insertions, 2 deletions

diff --git a/sound/soc/s3c24xx/Kconfig b/sound/soc/s3c24xx/Kconfig
index b489f1ae103d..ad3690ec3de8 100644
--- a/sound/soc/s3c24xx/Kconfig
+++ b/sound/soc/s3c24xx/Kconfig
@@ -32,7 +32,11 @@ config SND_S3C2443_SOC_AC97
         select S3C2410_DMA
         select AC97_BUS
         select SND_SOC_AC97_BUS
-        
+
+config SND_S3C_SOC_AC97
+        tristate
+        select SND_SOC_AC97_BUS
+
 config SND_S3C24XX_SOC_NEO1973_WM8753
         tristate "SoC I2S Audio support for NEO1973 - WM8753"
         depends on SND_S3C24XX_SOC && MACH_NEO1973_GTA01
diff --git a/sound/soc/s3c24xx/Makefile b/sound/soc/s3c24xx/Makefile
index b744657733d7..b7411bd59f33 100644
--- a/sound/soc/s3c24xx/Makefile
+++ b/sound/soc/s3c24xx/Makefile
@@ -4,12 +4,14 @@ snd-soc-s3c24xx-i2s-objs := s3c24xx-i2s.o
 snd-soc-s3c2412-i2s-objs := s3c2412-i2s.o
 snd-soc-s3c64xx-i2s-objs := s3c64xx-i2s.o
 snd-soc-s3c2443-ac97-objs := s3c2443-ac97.o
+snd-soc-s3c-ac97-objs := s3c-ac97.o
 snd-soc-s3c-i2s-v2-objs := s3c-i2s-v2.o
 snd-soc-s3c-pcm-objs := s3c-pcm.o
 
 obj-$(CONFIG_SND_S3C24XX_SOC) += snd-soc-s3c24xx.o
 obj-$(CONFIG_SND_S3C24XX_SOC_I2S) += snd-soc-s3c24xx-i2s.o
 obj-$(CONFIG_SND_S3C2443_SOC_AC97) += snd-soc-s3c2443-ac97.o
+obj-$(CONFIG_SND_S3C_SOC_AC97) += snd-soc-s3c-ac97.o
 obj-$(CONFIG_SND_S3C2412_SOC_I2S) += snd-soc-s3c2412-i2s.o
 obj-$(CONFIG_SND_S3C64XX_SOC_I2S) += snd-soc-s3c64xx-i2s.o
 obj-$(CONFIG_SND_S3C_I2SV2_SOC) += snd-soc-s3c-i2s-v2.o
@@ -37,4 +39,3 @@ obj-$(CONFIG_SND_S3C24XX_SOC_SIMTEC) += snd-soc-s3c24xx-simtec.o
 obj-$(CONFIG_SND_S3C24XX_SOC_SIMTEC_HERMES) += snd-soc-s3c24xx-simtec-hermes.o
 obj-$(CONFIG_SND_S3C24XX_SOC_SIMTEC_TLV320AIC23) += snd-soc-s3c24xx-simtec-tlv320aic23.o
 obj-$(CONFIG_SND_S3C64XX_SOC_WM8580) += snd-soc-smdk64xx-wm8580.o
-
diff --git a/sound/soc/s3c24xx/s3c-ac97.c b/sound/soc/s3c24xx/s3c-ac97.c
new file mode 100644
index 000000000000..ee8ed9d7e703
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c-ac97.c
@@ -0,0 +1,518 @@
+/* sound/soc/s3c24xx/s3c-ac97.c
+ *
+ * ALSA SoC Audio Layer - S3C AC97 Controller driver
+ *      Evolved from s3c2443-ac97.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co. Ltd
+ *      Author: Jaswinder Singh <jassi.brar@samsung.com>
+ *      Credits: Graeme Gregory, Sean Choi
+ *
+ * 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/io.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+
+#include <sound/soc.h>
+
+#include <plat/regs-ac97.h>
+#include <mach/dma.h>
+#include <plat/audio.h>
+
+#include "s3c-dma.h"
+#include "s3c-ac97.h"
+
+#define AC_CMD_ADDR(x) (x << 16)
+#define AC_CMD_DATA(x) (x & 0xffff)
+
+struct s3c_ac97_info {
+        unsigned           state;
+        struct clk         *ac97_clk;
+        void __iomem       *regs;
+        struct mutex       lock;
+        struct completion  done;
+};
+static struct s3c_ac97_info s3c_ac97;
+
+static struct s3c2410_dma_client s3c_dma_client_out = {
+        .name = "AC97 PCMOut"
+};
+
+static struct s3c2410_dma_client s3c_dma_client_in = {
+        .name = "AC97 PCMIn"
+};
+
+static struct s3c2410_dma_client s3c_dma_client_micin = {
+        .name = "AC97 MicIn"
+};
+
+static struct s3c_dma_params s3c_ac97_pcm_out = {
+        .client         = &s3c_dma_client_out,
+        .dma_size       = 4,
+};
+
+static struct s3c_dma_params s3c_ac97_pcm_in = {
+        .client         = &s3c_dma_client_in,
+        .dma_size       = 4,
+};
+
+static struct s3c_dma_params s3c_ac97_mic_in = {
+        .client         = &s3c_dma_client_micin,
+        .dma_size       = 4,
+};
+
+static void s3c_ac97_activate(struct snd_ac97 *ac97)
+{
+        u32 ac_glbctrl, stat;
+
+        stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
+        if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
+                return; /* Return if already active */
+
+        INIT_COMPLETION(s3c_ac97.done);
+
+        ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+
+        if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
+                printk(KERN_ERR "AC97: Unable to activate!");
+}
+
+static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
+        unsigned short reg)
+{
+        u32 ac_glbctrl, ac_codec_cmd;
+        u32 stat, addr, data;
+
+        mutex_lock(&s3c_ac97.lock);
+
+        s3c_ac97_activate(ac97);
+
+        INIT_COMPLETION(s3c_ac97.done);
+
+        ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
+        ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
+        writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
+
+        udelay(50);
+
+        ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+
+        if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
+                printk(KERN_ERR "AC97: Unable to read!");
+
+        stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
+        addr = (stat >> 16) & 0x7f;
+        data = (stat & 0xffff);
+
+        if (addr != reg)
+                printk(KERN_ERR "s3c-ac97: req addr = %02x, rep addr = %02x\n", reg, addr);
+
+        mutex_unlock(&s3c_ac97.lock);
+
+        return (unsigned short)data;
+}
+
+static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+        unsigned short val)
+{
+        u32 ac_glbctrl, ac_codec_cmd;
+
+        mutex_lock(&s3c_ac97.lock);
+
+        s3c_ac97_activate(ac97);
+
+        INIT_COMPLETION(s3c_ac97.done);
+
+        ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
+        ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
+        writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
+
+        udelay(50);
+
+        ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+
+        if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
+                printk(KERN_ERR "AC97: Unable to write!");
+
+        ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
+        ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
+        writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);
+
+        mutex_unlock(&s3c_ac97.lock);
+}
+
+static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
+{
+        writel(S3C_AC97_GLBCTRL_COLDRESET,
+                        s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+}
+
+static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+        u32 stat;
+
+        stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
+        if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
+                return; /* Return if already active */
+
+        writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        msleep(1);
+
+        s3c_ac97_activate(ac97);
+}
+
+static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
+{
+        u32 ac_glbctrl, ac_glbstat;
+
+        ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);
+
+        if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {
+
+                ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+                ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
+                writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+
+                complete(&s3c_ac97.done);
+        }
+
+        ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl |= (1<<30); /* Clear interrupt */
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+
+        return IRQ_HANDLED;
+}
+
+struct snd_ac97_bus_ops soc_ac97_ops = {
+        .read       = s3c_ac97_read,
+        .write      = s3c_ac97_write,
+        .warm_reset = s3c_ac97_warm_reset,
+        .reset      = s3c_ac97_cold_reset,
+};
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+static int s3c_ac97_hw_params(struct snd_pcm_substream *substream,
+                                  struct snd_pcm_hw_params *params,
+                                  struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                cpu_dai->dma_data = &s3c_ac97_pcm_out;
+        else
+                cpu_dai->dma_data = &s3c_ac97_pcm_in;
+
+        return 0;
+}
+
+static int s3c_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
+                                struct snd_soc_dai *dai)
+{
+        u32 ac_glbctrl;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        int channel = ((struct s3c_dma_params *)
+                  rtd->dai->cpu_dai->dma_data)->channel;
+
+        ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+                ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
+        else
+                ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
+
+        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)
+                        ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
+                else
+                        ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
+                break;
+
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                break;
+        }
+
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+
+        s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);
+
+        return 0;
+}
+
+static int s3c_ac97_hw_mic_params(struct snd_pcm_substream *substream,
+                                      struct snd_pcm_hw_params *params,
+                                      struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                return -ENODEV;
+        else
+                cpu_dai->dma_data = &s3c_ac97_mic_in;
+
+        return 0;
+}
+
+static int s3c_ac97_mic_trigger(struct snd_pcm_substream *substream,
+                                    int cmd, struct snd_soc_dai *dai)
+{
+        u32 ac_glbctrl;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        int channel = ((struct s3c_dma_params *)
+                  rtd->dai->cpu_dai->dma_data)->channel;
+
+        ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
+        ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
+                break;
+
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                break;
+        }
+
+        writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
+
+        s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);
+
+        return 0;
+}
+
+static struct snd_soc_dai_ops s3c_ac97_dai_ops = {
+        .hw_params      = s3c_ac97_hw_params,
+        .trigger        = s3c_ac97_trigger,
+};
+
+static struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
+        .hw_params      = s3c_ac97_hw_mic_params,
+        .trigger        = s3c_ac97_mic_trigger,
+};
+
+struct snd_soc_dai s3c_ac97_dai[] = {
+        [S3C_AC97_DAI_PCM] = {
+                .name = "s3c-ac97",
+                .id = S3C_AC97_DAI_PCM,
+                .ac97_control = 1,
+                .playback = {
+                        .stream_name = "AC97 Playback",
+                        .channels_min = 2,
+                        .channels_max = 2,
+                        .rates = SNDRV_PCM_RATE_8000_48000,
+                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                .capture = {
+                        .stream_name = "AC97 Capture",
+                        .channels_min = 2,
+                        .channels_max = 2,
+                        .rates = SNDRV_PCM_RATE_8000_48000,
+                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                .ops = &s3c_ac97_dai_ops,
+        },
+        [S3C_AC97_DAI_MIC] = {
+                .name = "s3c-ac97-mic",
+                .id = S3C_AC97_DAI_MIC,
+                .ac97_control = 1,
+                .capture = {
+                        .stream_name = "AC97 Mic Capture",
+                        .channels_min = 1,
+                        .channels_max = 1,
+                        .rates = SNDRV_PCM_RATE_8000_48000,
+                        .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+                .ops = &s3c_ac97_mic_dai_ops,
+        },
+};
+EXPORT_SYMBOL_GPL(s3c_ac97_dai);
+
+static __devinit int s3c_ac97_probe(struct platform_device *pdev)
+{
+        struct resource *mem_res, *dmatx_res, *dmarx_res, *dmamic_res, *irq_res;
+        struct s3c_audio_pdata *ac97_pdata;
+        int ret;
+
+        ac97_pdata = pdev->dev.platform_data;
+        if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
+                dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
+                return -EINVAL;
+        }
+
+        /* Check for availability of necessary resource */
+        dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+        if (!dmatx_res) {
+                dev_err(&pdev->dev, "Unable to get AC97-TX dma resource\n");
+                return -ENXIO;
+        }
+
+        dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+        if (!dmarx_res) {
+                dev_err(&pdev->dev, "Unable to get AC97-RX dma resource\n");
+                return -ENXIO;
+        }
+
+        dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
+        if (!dmamic_res) {
+                dev_err(&pdev->dev, "Unable to get AC97-MIC dma resource\n");
+                return -ENXIO;
+        }
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem_res) {
+                dev_err(&pdev->dev, "Unable to get register resource\n");
+                return -ENXIO;
+        }
+
+        irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!irq_res) {
+                dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
+                return -ENXIO;
+        }
+
+        if (!request_mem_region(mem_res->start,
+                                resource_size(mem_res), "s3c-ac97")) {
+                dev_err(&pdev->dev, "Unable to request register region\n");
+                return -EBUSY;
+        }
+
+        s3c_ac97_pcm_out.channel = dmatx_res->start;
+        s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
+        s3c_ac97_pcm_in.channel = dmarx_res->start;
+        s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
+        s3c_ac97_mic_in.channel = dmamic_res->start;
+        s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;
+
+        init_completion(&s3c_ac97.done);
+        mutex_init(&s3c_ac97.lock);
+
+        s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
+        if (s3c_ac97.regs == NULL) {
+                dev_err(&pdev->dev, "Unable to ioremap register region\n");
+                ret = -ENXIO;
+                goto err1;
+        }
+
+        s3c_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
+        if (IS_ERR(s3c_ac97.ac97_clk)) {
+                dev_err(&pdev->dev, "s3c-ac97 failed to get ac97_clock\n");
+                ret = -ENODEV;
+                goto err2;
+        }
+        clk_enable(s3c_ac97.ac97_clk);
+
+        if (ac97_pdata->cfg_gpio(pdev)) {
+                dev_err(&pdev->dev, "Unable to configure gpio\n");
+                ret = -EINVAL;
+                goto err3;
+        }
+
+        ret = request_irq(irq_res->start, s3c_ac97_irq,
+                                        IRQF_DISABLED, "AC97", NULL);
+        if (ret < 0) {
+                printk(KERN_ERR "s3c-ac97: interrupt request failed.\n");
+                goto err4;
+        }
+
+        s3c_ac97_dai[S3C_AC97_DAI_PCM].dev = &pdev->dev;
+        s3c_ac97_dai[S3C_AC97_DAI_MIC].dev = &pdev->dev;
+
+        ret = snd_soc_register_dais(s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
+        if (ret)
+                goto err5;
+
+        return 0;
+
+err5:
+        free_irq(irq_res->start, NULL);
+err4:
+err3:
+        clk_disable(s3c_ac97.ac97_clk);
+        clk_put(s3c_ac97.ac97_clk);
+err2:
+        iounmap(s3c_ac97.regs);
+err1:
+        release_mem_region(mem_res->start, resource_size(mem_res));
+
+        return ret;
+}
+
+static __devexit int s3c_ac97_remove(struct platform_device *pdev)
+{
+        struct resource *mem_res, *irq_res;
+
+        snd_soc_unregister_dais(s3c_ac97_dai, ARRAY_SIZE(s3c_ac97_dai));
+
+        irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (irq_res)
+                free_irq(irq_res->start, NULL);
+
+        clk_disable(s3c_ac97.ac97_clk);
+        clk_put(s3c_ac97.ac97_clk);
+
+        iounmap(s3c_ac97.regs);
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (mem_res)
+                release_mem_region(mem_res->start, resource_size(mem_res));
+
+        return 0;
+}
+
+static struct platform_driver s3c_ac97_driver = {
+        .probe  = s3c_ac97_probe,
+        .remove = s3c_ac97_remove,
+        .driver = {
+                .name = "s3c-ac97",
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init s3c_ac97_init(void)
+{
+        return platform_driver_register(&s3c_ac97_driver);
+}
+module_init(s3c_ac97_init);
+
+static void __exit s3c_ac97_exit(void)
+{
+        platform_driver_unregister(&s3c_ac97_driver);
+}
+module_exit(s3c_ac97_exit);
+
+MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
+MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/s3c24xx/s3c-ac97.h b/sound/soc/s3c24xx/s3c-ac97.h
new file mode 100644
index 000000000000..278198379def
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c-ac97.h
@@ -0,0 +1,23 @@
+/* sound/soc/s3c24xx/s3c-ac97.h
+ *
+ * ALSA SoC Audio Layer - S3C AC97 Controller driver
+ *      Evolved from s3c2443-ac97.h
+ *
+ * Copyright (c) 2010 Samsung Electronics Co. Ltd
+ *      Author: Jaswinder Singh <jassi.brar@samsung.com>
+ *      Credits: Graeme Gregory, Sean Choi
+ *
+ * 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 __S3C_AC97_H_
+#define __S3C_AC97_H_
+
+#define S3C_AC97_DAI_PCM 0
+#define S3C_AC97_DAI_MIC 1
+
+extern struct snd_soc_dai s3c_ac97_dai[];
+
+#endif /* __S3C_AC97_H_ */