1 files changed, 758 insertions, 0 deletions

diff --git a/sound/soc/imx/imx-ssi.c b/sound/soc/imx/imx-ssi.c
new file mode 100644
index 000000000000..56f46a75d297
--- /dev/null
+++ b/sound/soc/imx/imx-ssi.c
@@ -0,0 +1,758 @@
+/*
+ * imx-ssi.c  --  ALSA Soc Audio Layer
+ *
+ * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * This code is based on code copyrighted by Freescale,
+ * Liam Girdwood, Javier Martin and probably others.
+ *
+ *  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;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ *
+ * The i.MX SSI core has some nasty limitations in AC97 mode. While most
+ * sane processor vendors have a FIFO per AC97 slot, the i.MX has only
+ * one FIFO which combines all valid receive slots. We cannot even select
+ * which slots we want to receive. The WM9712 with which this driver
+ * was developped with always sends GPIO status data in slot 12 which
+ * we receive in our (PCM-) data stream. The only chance we have is to
+ * manually skip this data in the FIQ handler. With sampling rates different
+ * from 48000Hz not every frame has valid receive data, so the ratio
+ * between pcm data and GPIO status data changes. Our FIQ handler is not
+ * able to handle this, hence this driver only works with 48000Hz sampling
+ * rate.
+ * Reading and writing AC97 registers is another challange. The core
+ * provides us status bits when the read register is updated with *another*
+ * value. When we read the same register two times (and the register still
+ * contains the same value) these status bits are not set. We work
+ * around this by not polling these bits but only wait a fixed delay.
+ * 
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <mach/ssi.h>
+#include <mach/hardware.h>
+
+#include "imx-ssi.h"
+
+#define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV)
+
+/*
+ * SSI Network Mode or TDM slots configuration.
+ * Should only be called when port is inactive (i.e. SSIEN = 0).
+ */
+static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
+        unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
+{
+        struct imx_ssi *ssi = cpu_dai->private_data;
+        u32 sccr;
+
+        sccr = readl(ssi->base + SSI_STCCR);
+        sccr &= ~SSI_STCCR_DC_MASK;
+        sccr |= SSI_STCCR_DC(slots - 1);
+        writel(sccr, ssi->base + SSI_STCCR);
+
+        sccr = readl(ssi->base + SSI_SRCCR);
+        sccr &= ~SSI_STCCR_DC_MASK;
+        sccr |= SSI_STCCR_DC(slots - 1);
+        writel(sccr, ssi->base + SSI_SRCCR);
+
+        writel(tx_mask, ssi->base + SSI_STMSK);
+        writel(rx_mask, ssi->base + SSI_SRMSK);
+
+        return 0;
+}
+
+/*
+ * SSI DAI format configuration.
+ * Should only be called when port is inactive (i.e. SSIEN = 0).
+ * Note: We don't use the I2S modes but instead manually configure the
+ * SSI for I2S because the I2S mode is only a register preset.
+ */
+static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
+{
+        struct imx_ssi *ssi = cpu_dai->private_data;
+        u32 strcr = 0, scr;
+
+        scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET);
+
+        /* DAI mode */
+        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+        case SND_SOC_DAIFMT_I2S:
+                /* data on rising edge of bclk, frame low 1clk before data */
+                strcr |= SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0;
+                scr |= SSI_SCR_NET;
+                break;
+        case SND_SOC_DAIFMT_LEFT_J:
+                /* data on rising edge of bclk, frame high with data */
+                strcr |= SSI_STCR_TXBIT0;
+                break;
+        case SND_SOC_DAIFMT_DSP_B:
+                /* data on rising edge of bclk, frame high with data */
+                strcr |= SSI_STCR_TFSL;
+                break;
+        case SND_SOC_DAIFMT_DSP_A:
+                /* data on rising edge of bclk, frame high 1clk before data */
+                strcr |= SSI_STCR_TFSL | SSI_STCR_TEFS;
+                break;
+        }
+
+        /* DAI clock inversion */
+        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+        case SND_SOC_DAIFMT_IB_IF:
+                strcr |= SSI_STCR_TFSI;
+                strcr &= ~SSI_STCR_TSCKP;
+                break;
+        case SND_SOC_DAIFMT_IB_NF:
+                strcr &= ~(SSI_STCR_TSCKP | SSI_STCR_TFSI);
+                break;
+        case SND_SOC_DAIFMT_NB_IF:
+                strcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP;
+                break;
+        case SND_SOC_DAIFMT_NB_NF:
+                strcr &= ~SSI_STCR_TFSI;
+                strcr |= SSI_STCR_TSCKP;
+                break;
+        }
+
+        /* DAI clock master masks */
+        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBM_CFM:
+                break;
+        default:
+                /* Master mode not implemented, needs handling of clocks. */
+                return -EINVAL;
+        }
+
+        strcr |= SSI_STCR_TFEN0;
+
+        writel(strcr, ssi->base + SSI_STCR);
+        writel(strcr, ssi->base + SSI_SRCR);
+        writel(scr, ssi->base + SSI_SCR);
+
+        return 0;
+}
+
+/*
+ * SSI system clock configuration.
+ * Should only be called when port is inactive (i.e. SSIEN = 0).
+ */
+static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
+                                  int clk_id, unsigned int freq, int dir)
+{
+        struct imx_ssi *ssi = cpu_dai->private_data;
+        u32 scr;
+
+        scr = readl(ssi->base + SSI_SCR);
+
+        switch (clk_id) {
+        case IMX_SSP_SYS_CLK:
+                if (dir == SND_SOC_CLOCK_OUT)
+                        scr |= SSI_SCR_SYS_CLK_EN;
+                else
+                        scr &= ~SSI_SCR_SYS_CLK_EN;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        writel(scr, ssi->base + SSI_SCR);
+
+        return 0;
+}
+
+/*
+ * SSI Clock dividers
+ * Should only be called when port is inactive (i.e. SSIEN = 0).
+ */
+static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
+                                  int div_id, int div)
+{
+        struct imx_ssi *ssi = cpu_dai->private_data;
+        u32 stccr, srccr;
+
+        stccr = readl(ssi->base + SSI_STCCR);
+        srccr = readl(ssi->base + SSI_SRCCR);
+
+        switch (div_id) {
+        case IMX_SSI_TX_DIV_2:
+                stccr &= ~SSI_STCCR_DIV2;
+                stccr |= div;
+                break;
+        case IMX_SSI_TX_DIV_PSR:
+                stccr &= ~SSI_STCCR_PSR;
+                stccr |= div;
+                break;
+        case IMX_SSI_TX_DIV_PM:
+                stccr &= ~0xff;
+                stccr |= SSI_STCCR_PM(div);
+                break;
+        case IMX_SSI_RX_DIV_2:
+                stccr &= ~SSI_STCCR_DIV2;
+                stccr |= div;
+                break;
+        case IMX_SSI_RX_DIV_PSR:
+                stccr &= ~SSI_STCCR_PSR;
+                stccr |= div;
+                break;
+        case IMX_SSI_RX_DIV_PM:
+                stccr &= ~0xff;
+                stccr |= SSI_STCCR_PM(div);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        writel(stccr, ssi->base + SSI_STCCR);
+        writel(srccr, ssi->base + SSI_SRCCR);
+
+        return 0;
+}
+
+/*
+ * Should only be called when port is inactive (i.e. SSIEN = 0),
+ * although can be called multiple times by upper layers.
+ */
+static int imx_ssi_hw_params(struct snd_pcm_substream *substream,
+                             struct snd_pcm_hw_params *params,
+                             struct snd_soc_dai *cpu_dai)
+{
+        struct imx_ssi *ssi = cpu_dai->private_data;
+        u32 reg, sccr;
+
+        /* Tx/Rx config */
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                reg = SSI_STCCR;
+                cpu_dai->dma_data = &ssi->dma_params_tx;
+        } else {
+                reg = SSI_SRCCR;
+                cpu_dai->dma_data = &ssi->dma_params_rx;
+        }
+
+        sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;
+
+        /* DAI data (word) size */
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                sccr |= SSI_SRCCR_WL(16);
+                break;
+        case SNDRV_PCM_FORMAT_S20_3LE:
+                sccr |= SSI_SRCCR_WL(20);
+                break;
+        case SNDRV_PCM_FORMAT_S24_LE:
+                sccr |= SSI_SRCCR_WL(24);
+                break;
+        }
+
+        writel(sccr, ssi->base + reg);
+
+        return 0;
+}
+
+static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
+                struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
+        struct imx_ssi *ssi = cpu_dai->private_data;
+        unsigned int sier_bits, sier;
+        unsigned int scr;
+
+        scr = readl(ssi->base + SSI_SCR);
+        sier = readl(ssi->base + SSI_SIER);
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                if (ssi->flags & IMX_SSI_DMA)
+                        sier_bits = SSI_SIER_TDMAE;
+                else
+                        sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN;
+        } else {
+                if (ssi->flags & IMX_SSI_DMA)
+                        sier_bits = SSI_SIER_RDMAE;
+                else
+                        sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN;
+        }
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                        scr |= SSI_SCR_TE;
+                else
+                        scr |= SSI_SCR_RE;
+                sier |= sier_bits;
+
+                if (++ssi->enabled == 1)
+                        scr |= SSI_SCR_SSIEN;
+
+                break;
+
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                        scr &= ~SSI_SCR_TE;
+                else
+                        scr &= ~SSI_SCR_RE;
+                sier &= ~sier_bits;
+
+                if (--ssi->enabled == 0)
+                        scr &= ~SSI_SCR_SSIEN;
+
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (!(ssi->flags & IMX_SSI_USE_AC97))
+                /* rx/tx are always enabled to access ac97 registers */
+                writel(scr, ssi->base + SSI_SCR);
+
+        writel(sier, ssi->base + SSI_SIER);
+
+        return 0;
+}
+
+static struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {
+        .hw_params      = imx_ssi_hw_params,
+        .set_fmt        = imx_ssi_set_dai_fmt,
+        .set_clkdiv     = imx_ssi_set_dai_clkdiv,
+        .set_sysclk     = imx_ssi_set_dai_sysclk,
+        .set_tdm_slot   = imx_ssi_set_dai_tdm_slot,
+        .trigger        = imx_ssi_trigger,
+};
+
+static struct snd_soc_dai imx_ssi_dai = {
+        .playback = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_8000_96000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .capture = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_8000_96000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .ops = &imx_ssi_pcm_dai_ops,
+};
+
+int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
+                struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        int ret;
+
+        ret = dma_mmap_coherent(NULL, vma, runtime->dma_area,
+                        runtime->dma_addr, runtime->dma_bytes);
+
+        pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
+                        runtime->dma_area,
+                        runtime->dma_addr,
+                        runtime->dma_bytes);
+        return ret;
+}
+
+static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+        struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+        struct snd_dma_buffer *buf = &substream->dma_buffer;
+        size_t size = IMX_SSI_DMABUF_SIZE;
+
+        buf->dev.type = SNDRV_DMA_TYPE_DEV;
+        buf->dev.dev = pcm->card->dev;
+        buf->private_data = NULL;
+        buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+                                           &buf->addr, GFP_KERNEL);
+        if (!buf->area)
+                return -ENOMEM;
+        buf->bytes = size;
+
+        return 0;
+}
+
+static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
+
+int imx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
+        struct snd_pcm *pcm)
+{
+
+        int ret = 0;
+
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &imx_pcm_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+        if (dai->playback.channels_min) {
+                ret = imx_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_PLAYBACK);
+                if (ret)
+                        goto out;
+        }
+
+        if (dai->capture.channels_min) {
+                ret = imx_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_CAPTURE);
+                if (ret)
+                        goto out;
+        }
+
+out:
+        return ret;
+}
+
+void imx_pcm_free(struct snd_pcm *pcm)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_dma_buffer *buf;
+        int stream;
+
+        for (stream = 0; stream < 2; stream++) {
+                substream = pcm->streams[stream].substream;
+                if (!substream)
+                        continue;
+
+                buf = &substream->dma_buffer;
+                if (!buf->area)
+                        continue;
+
+                dma_free_writecombine(pcm->card->dev, buf->bytes,
+                                      buf->area, buf->addr);
+                buf->area = NULL;
+        }
+}
+
+struct snd_soc_platform imx_soc_platform = {
+        .name           = "imx-audio",
+};
+EXPORT_SYMBOL_GPL(imx_soc_platform);
+
+static struct snd_soc_dai imx_ac97_dai = {
+        .name = "AC97",
+        .ac97_control = 1,
+        .playback = {
+                .stream_name = "AC97 Playback",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_48000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .capture = {
+                .stream_name = "AC97 Capture",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_48000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .ops = &imx_ssi_pcm_dai_ops,
+};
+
+static void setup_channel_to_ac97(struct imx_ssi *imx_ssi)
+{
+        void __iomem *base = imx_ssi->base;
+
+        writel(0x0, base + SSI_SCR);
+        writel(0x0, base + SSI_STCR);
+        writel(0x0, base + SSI_SRCR);
+
+        writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR);
+
+        writel(SSI_SFCSR_RFWM0(8) |
+                SSI_SFCSR_TFWM0(8) |
+                SSI_SFCSR_RFWM1(8) |
+                SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);
+
+        writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR);
+        writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR);
+
+        writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR);
+        writel(SSI_SOR_WAIT(3), base + SSI_SOR);
+
+        writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN |
+                        SSI_SCR_TE | SSI_SCR_RE,
+                        base + SSI_SCR);
+
+        writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
+        writel(0xff, base + SSI_SACCDIS);
+        writel(0x300, base + SSI_SACCEN);
+}
+
+static struct imx_ssi *ac97_ssi;
+
+static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
+                unsigned short val)
+{
+        struct imx_ssi *imx_ssi = ac97_ssi;
+        void __iomem *base = imx_ssi->base;
+        unsigned int lreg;
+        unsigned int lval;
+
+        if (reg > 0x7f)
+                return;
+
+        pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
+
+        lreg = reg <<  12;
+        writel(lreg, base + SSI_SACADD);
+
+        lval = val << 4;
+        writel(lval , base + SSI_SACDAT);
+
+        writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT);
+        udelay(100);
+}
+
+static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,
+                unsigned short reg)
+{
+        struct imx_ssi *imx_ssi = ac97_ssi;
+        void __iomem *base = imx_ssi->base;
+
+        unsigned short val = -1;
+        unsigned int lreg;
+
+        lreg = (reg & 0x7f) <<  12 ;
+        writel(lreg, base + SSI_SACADD);
+        writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT);
+
+        udelay(100);
+
+        val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;
+
+        pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
+
+        return val;
+}
+
+static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
+{
+        struct imx_ssi *imx_ssi = ac97_ssi;
+
+        if (imx_ssi->ac97_reset)
+                imx_ssi->ac97_reset(ac97);
+}
+
+static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
+{
+        struct imx_ssi *imx_ssi = ac97_ssi;
+
+        if (imx_ssi->ac97_warm_reset)
+                imx_ssi->ac97_warm_reset(ac97);
+}
+
+struct snd_ac97_bus_ops soc_ac97_ops = {
+        .read           = imx_ssi_ac97_read,
+        .write          = imx_ssi_ac97_write,
+        .reset          = imx_ssi_ac97_reset,
+        .warm_reset     = imx_ssi_ac97_warm_reset
+};
+EXPORT_SYMBOL_GPL(soc_ac97_ops);
+
+struct snd_soc_dai imx_ssi_pcm_dai[2];
+EXPORT_SYMBOL_GPL(imx_ssi_pcm_dai);
+
+static int imx_ssi_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        struct imx_ssi *ssi;
+        struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
+        struct snd_soc_platform *platform;
+        int ret = 0;
+        unsigned int val;
+        struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id];
+
+        if (dai->id >= ARRAY_SIZE(imx_ssi_pcm_dai))
+                return -EINVAL;
+
+        ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
+        if (!ssi)
+                return -ENOMEM;
+
+        if (pdata) {
+                ssi->ac97_reset = pdata->ac97_reset;
+                ssi->ac97_warm_reset = pdata->ac97_warm_reset;
+                ssi->flags = pdata->flags;
+        }
+
+        ssi->irq = platform_get_irq(pdev, 0);
+
+        ssi->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(ssi->clk)) {
+                ret = PTR_ERR(ssi->clk);
+                dev_err(&pdev->dev, "Cannot get the clock: %d\n",
+                        ret);
+                goto failed_clk;
+        }
+        clk_enable(ssi->clk);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                ret = -ENODEV;
+                goto failed_get_resource;
+        }
+
+        if (!request_mem_region(res->start, resource_size(res), DRV_NAME)) {
+                dev_err(&pdev->dev, "request_mem_region failed\n");
+                ret = -EBUSY;
+                goto failed_get_resource;
+        }
+
+        ssi->base = ioremap(res->start, resource_size(res));
+        if (!ssi->base) {
+                dev_err(&pdev->dev, "ioremap failed\n");
+                ret = -ENODEV;
+                goto failed_ioremap;
+        }
+
+        if (ssi->flags & IMX_SSI_USE_AC97) {
+                if (ac97_ssi) {
+                        ret = -EBUSY;
+                        goto failed_ac97;
+                }
+                ac97_ssi = ssi;
+                setup_channel_to_ac97(ssi);
+                memcpy(dai, &imx_ac97_dai, sizeof(imx_ac97_dai));
+        } else
+                memcpy(dai, &imx_ssi_dai, sizeof(imx_ssi_dai));
+
+        writel(0x0, ssi->base + SSI_SIER);
+
+        ssi->dma_params_rx.dma_addr = res->start + SSI_SRX0;
+        ssi->dma_params_tx.dma_addr = res->start + SSI_STX0;
+
+        res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
+        if (res)
+                ssi->dma_params_tx.dma = res->start;
+
+        res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
+        if (res)
+                ssi->dma_params_rx.dma = res->start;
+
+        dai->id = pdev->id;
+        dai->dev = &pdev->dev;
+        dai->name = kasprintf(GFP_KERNEL, "imx-ssi.%d", pdev->id);
+        dai->private_data = ssi;
+
+        if ((cpu_is_mx27() || cpu_is_mx21()) &&
+                        !(ssi->flags & IMX_SSI_USE_AC97)) {
+                ssi->flags |= IMX_SSI_DMA;
+                platform = imx_ssi_dma_mx2_init(pdev, ssi);
+        } else
+                platform = imx_ssi_fiq_init(pdev, ssi);
+
+        imx_soc_platform.pcm_ops = platform->pcm_ops;
+        imx_soc_platform.pcm_new = platform->pcm_new;
+        imx_soc_platform.pcm_free = platform->pcm_free;
+
+        val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.burstsize) |
+                SSI_SFCSR_RFWM0(ssi->dma_params_rx.burstsize);
+        writel(val, ssi->base + SSI_SFCSR);
+
+        ret = snd_soc_register_dai(dai);
+        if (ret) {
+                dev_err(&pdev->dev, "register DAI failed\n");
+                goto failed_register;
+        }
+
+        platform_set_drvdata(pdev, ssi);
+
+        return 0;
+
+failed_register:
+failed_ac97:
+        iounmap(ssi->base);
+failed_ioremap:
+        release_mem_region(res->start, resource_size(res));
+failed_get_resource:
+        clk_disable(ssi->clk);
+        clk_put(ssi->clk);
+failed_clk:
+        kfree(ssi);
+
+        return ret;
+}
+
+static int __devexit imx_ssi_remove(struct platform_device *pdev)
+{
+        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        struct imx_ssi *ssi = platform_get_drvdata(pdev);
+        struct snd_soc_dai *dai = &imx_ssi_pcm_dai[pdev->id];
+
+        snd_soc_unregister_dai(dai);
+
+        if (ssi->flags & IMX_SSI_USE_AC97)
+                ac97_ssi = NULL;
+
+        if (!(ssi->flags & IMX_SSI_DMA))
+                imx_ssi_fiq_exit(pdev, ssi);
+
+        iounmap(ssi->base);
+        release_mem_region(res->start, resource_size(res));
+        clk_disable(ssi->clk);
+        clk_put(ssi->clk);
+        kfree(ssi);
+
+        return 0;
+}
+
+static struct platform_driver imx_ssi_driver = {
+        .probe = imx_ssi_probe,
+        .remove = __devexit_p(imx_ssi_remove),
+
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init imx_ssi_init(void)
+{
+        int ret;
+
+        ret = snd_soc_register_platform(&imx_soc_platform);
+        if (ret) {
+                pr_err("failed to register soc platform: %d\n", ret);
+                return ret;
+        }
+
+        ret = platform_driver_register(&imx_ssi_driver);
+        if (ret) {
+                snd_soc_unregister_platform(&imx_soc_platform);
+                return ret;
+        }
+
+        return 0;
+}
+
+static void __exit imx_ssi_exit(void)
+{
+        platform_driver_unregister(&imx_ssi_driver);
+        snd_soc_unregister_platform(&imx_soc_platform);
+}
+
+module_init(imx_ssi_init);
+module_exit(imx_ssi_exit);
+
+/* Module information */
+MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
+MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface");
+MODULE_LICENSE("GPL");
+