ALSA: AC97: add AC97 support for AT91.

This patch add AC97 support for ATMEL AT91, using the AVR32 code.
While AVR is using a DMA, the AT91 chips are using a Peripheral Data
Controller.

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 254 insertions, 85 deletions

diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 0c0f8771656a..3c0a6f4e3585 100644
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -13,6 +13,7 @@
 #include <linux/device.h>
 #include <linux/dmaengine.h>
 #include <linux/dma-mapping.h>
+#include <linux/atmel_pdc.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
@@ -31,6 +32,10 @@
 
 #include <linux/dw_dmac.h>
 
+#include <mach/cpu.h>
+#include <mach/hardware.h>
+#include <mach/gpio.h>
+
 #include "ac97c.h"
 
 enum {
@@ -63,6 +68,7 @@ struct atmel_ac97c {
         u64                             cur_format;
         unsigned int                    cur_rate;
         unsigned long                   flags;
+        int                             playback_period, capture_period;
         /* Serialize access to opened variable */
         spinlock_t                      lock;
         void __iomem                    *regs;
@@ -242,10 +248,12 @@ static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
         if (retval < 0)
                 return retval;
         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
-        if (retval == 1)
-                if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
-                        dw_dma_cyclic_free(chip->dma.tx_chan);
-
+        if (cpu_is_at32ap7000()) {
+                /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
+                if (retval == 1)
+                        if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
+                                dw_dma_cyclic_free(chip->dma.tx_chan);
+        }
         /* Set restrictions to params. */
         mutex_lock(&opened_mutex);
         chip->cur_rate = params_rate(hw_params);
@@ -266,9 +274,14 @@ static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
         if (retval < 0)
                 return retval;
         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
-        if (retval == 1)
-                if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
-                        dw_dma_cyclic_free(chip->dma.rx_chan);
+        if (cpu_is_at32ap7000()) {
+                if (retval < 0)
+                        return retval;
+                /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
+                if (retval == 1)
+                        if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
+                                dw_dma_cyclic_free(chip->dma.rx_chan);
+        }
 
         /* Set restrictions to params. */
         mutex_lock(&opened_mutex);
@@ -282,16 +295,20 @@ static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
 {
         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
-        if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
-                dw_dma_cyclic_free(chip->dma.tx_chan);
+        if (cpu_is_at32ap7000()) {
+                if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
+                        dw_dma_cyclic_free(chip->dma.tx_chan);
+        }
         return snd_pcm_lib_free_pages(substream);
 }
 
 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
 {
         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
-        if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
-                dw_dma_cyclic_free(chip->dma.rx_chan);
+        if (cpu_is_at32ap7000()) {
+                if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
+                        dw_dma_cyclic_free(chip->dma.rx_chan);
+        }
         return snd_pcm_lib_free_pages(substream);
 }
 
@@ -299,9 +316,11 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
 {
         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
         struct snd_pcm_runtime *runtime = substream->runtime;
+        int block_size = frames_to_bytes(runtime, runtime->period_size);
         unsigned long word = ac97c_readl(chip, OCA);
         int retval;
 
+        chip->playback_period = 0;
         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 
         /* assign channels to AC97C channel A */
@@ -324,7 +343,8 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
 
         switch (runtime->format) {
         case SNDRV_PCM_FORMAT_S16_LE:
-                word |= AC97C_CMR_CEM_LITTLE;
+                if (cpu_is_at32ap7000())
+                        word |= AC97C_CMR_CEM_LITTLE;
                 break;
         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
                 word &= ~(AC97C_CMR_CEM_LITTLE);
@@ -363,9 +383,18 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
                                 runtime->rate);
 
-        if (!test_bit(DMA_TX_READY, &chip->flags))
-                retval = atmel_ac97c_prepare_dma(chip, substream,
-                                DMA_TO_DEVICE);
+        if (cpu_is_at32ap7000()) {
+                if (!test_bit(DMA_TX_READY, &chip->flags))
+                        retval = atmel_ac97c_prepare_dma(chip, substream,
+                                        DMA_TO_DEVICE);
+        } else {
+                /* Initialize and start the PDC */
+                writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
+                writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
+                writel(runtime->dma_addr + block_size,
+                                chip->regs + ATMEL_PDC_TNPR);
+                writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
+        }
 
         return retval;
 }
@@ -374,9 +403,11 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
 {
         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
         struct snd_pcm_runtime *runtime = substream->runtime;
+        int block_size = frames_to_bytes(runtime, runtime->period_size);
         unsigned long word = ac97c_readl(chip, ICA);
         int retval;
 
+        chip->capture_period = 0;
         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 
         /* assign channels to AC97C channel A */
@@ -399,7 +430,8 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
 
         switch (runtime->format) {
         case SNDRV_PCM_FORMAT_S16_LE:
-                word |= AC97C_CMR_CEM_LITTLE;
+                if (cpu_is_at32ap7000())
+                        word |= AC97C_CMR_CEM_LITTLE;
                 break;
         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
                 word &= ~(AC97C_CMR_CEM_LITTLE);
@@ -438,9 +470,18 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
                                 runtime->rate);
 
-        if (!test_bit(DMA_RX_READY, &chip->flags))
-                retval = atmel_ac97c_prepare_dma(chip, substream,
-                                DMA_FROM_DEVICE);
+        if (cpu_is_at32ap7000()) {
+                if (!test_bit(DMA_RX_READY, &chip->flags))
+                        retval = atmel_ac97c_prepare_dma(chip, substream,
+                                        DMA_FROM_DEVICE);
+        } else {
+                /* Initialize and start the PDC */
+                writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
+                writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
+                writel(runtime->dma_addr + block_size,
+                                chip->regs + ATMEL_PDC_RNPR);
+                writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
+        }
 
         return retval;
 }
@@ -449,7 +490,7 @@ static int
 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 {
         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
-        unsigned long camr;
+        unsigned long camr, ptcr = 0;
         int retval = 0;
 
         camr = ac97c_readl(chip, CAMR);
@@ -458,15 +499,22 @@ atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
         case SNDRV_PCM_TRIGGER_START:
-                retval = dw_dma_cyclic_start(chip->dma.tx_chan);
-                if (retval)
-                        goto out;
+                if (cpu_is_at32ap7000()) {
+                        retval = dw_dma_cyclic_start(chip->dma.tx_chan);
+                        if (retval)
+                                goto out;
+                } else {
+                        ptcr = ATMEL_PDC_TXTEN;
+                }
                 camr |= AC97C_CMR_CENA;
                 break;
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
         case SNDRV_PCM_TRIGGER_STOP:
-                dw_dma_cyclic_stop(chip->dma.tx_chan);
+                if (cpu_is_at32ap7000())
+                        dw_dma_cyclic_stop(chip->dma.tx_chan);
+                else
+                        ptcr |= ATMEL_PDC_TXTDIS;
                 if (chip->opened <= 1)
                         camr &= ~AC97C_CMR_CENA;
                 break;
@@ -476,6 +524,8 @@ atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
         }
 
         ac97c_writel(chip, CAMR, camr);
+        if (!cpu_is_at32ap7000())
+                writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 out:
         return retval;
 }
@@ -484,24 +534,32 @@ static int
 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 {
         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
-        unsigned long camr;
+        unsigned long camr, ptcr = 0;
         int retval = 0;
 
         camr = ac97c_readl(chip, CAMR);
+        ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
 
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
         case SNDRV_PCM_TRIGGER_START:
-                retval = dw_dma_cyclic_start(chip->dma.rx_chan);
-                if (retval)
-                        goto out;
+                if (cpu_is_at32ap7000()) {
+                        retval = dw_dma_cyclic_start(chip->dma.rx_chan);
+                        if (retval)
+                                goto out;
+                } else {
+                        ptcr = ATMEL_PDC_RXTEN;
+                }
                 camr |= AC97C_CMR_CENA;
                 break;
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
         case SNDRV_PCM_TRIGGER_STOP:
-                dw_dma_cyclic_stop(chip->dma.rx_chan);
+                if (cpu_is_at32ap7000())
+                        dw_dma_cyclic_stop(chip->dma.rx_chan);
+                else
+                        ptcr |= (ATMEL_PDC_RXTDIS);
                 if (chip->opened <= 1)
                         camr &= ~AC97C_CMR_CENA;
                 break;
@@ -511,6 +569,8 @@ atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
         }
 
         ac97c_writel(chip, CAMR, camr);
+        if (!cpu_is_at32ap7000())
+                writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 out:
         return retval;
 }
@@ -523,7 +583,10 @@ atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
         snd_pcm_uframes_t       frames;
         unsigned long           bytes;
 
-        bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
+        if (cpu_is_at32ap7000())
+                bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
+        else
+                bytes = readl(chip->regs + ATMEL_PDC_TPR);
         bytes -= runtime->dma_addr;
 
         frames = bytes_to_frames(runtime, bytes);
@@ -540,7 +603,10 @@ atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
         snd_pcm_uframes_t       frames;
         unsigned long           bytes;
 
-        bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
+        if (cpu_is_at32ap7000())
+                bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
+        else
+                bytes = readl(chip->regs + ATMEL_PDC_RPR);
         bytes -= runtime->dma_addr;
 
         frames = bytes_to_frames(runtime, bytes);
@@ -578,8 +644,11 @@ static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
         u32                     sr     = ac97c_readl(chip, SR);
         u32                     casr   = ac97c_readl(chip, CASR);
         u32                     cosr   = ac97c_readl(chip, COSR);
+        u32                     camr   = ac97c_readl(chip, CAMR);
 
         if (sr & AC97C_SR_CAEVT) {
+                struct snd_pcm_runtime *runtime;
+                int offset, next_period, block_size;
                 dev_info(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
                                 casr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
                                 casr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
@@ -587,6 +656,50 @@ static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
                                 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
                                 casr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
                                 !casr                    ? " NONE"    : "");
+                if (!cpu_is_at32ap7000()) {
+                        if ((casr & camr) & AC97C_CSR_ENDTX) {
+                                runtime = chip->playback_substream->runtime;
+                                block_size = frames_to_bytes(runtime,
+                                                runtime->period_size);
+                                chip->playback_period++;
+
+                                if (chip->playback_period == runtime->periods)
+                                        chip->playback_period = 0;
+                                next_period = chip->playback_period + 1;
+                                if (next_period == runtime->periods)
+                                        next_period = 0;
+
+                                offset = block_size * next_period;
+
+                                writel(runtime->dma_addr + offset,
+                                                chip->regs + ATMEL_PDC_TNPR);
+                                writel(block_size / 2,
+                                                chip->regs + ATMEL_PDC_TNCR);
+
+                                snd_pcm_period_elapsed(
+                                                chip->playback_substream);
+                        }
+                        if ((casr & camr) & AC97C_CSR_ENDRX) {
+                                runtime = chip->capture_substream->runtime;
+                                block_size = frames_to_bytes(runtime,
+                                                runtime->period_size);
+                                chip->capture_period++;
+
+                                if (chip->capture_period == runtime->periods)
+                                        chip->capture_period = 0;
+                                next_period = chip->capture_period + 1;
+                                if (next_period == runtime->periods)
+                                        next_period = 0;
+
+                                offset = block_size * next_period;
+
+                                writel(runtime->dma_addr + offset,
+                                                chip->regs + ATMEL_PDC_RNPR);
+                                writel(block_size / 2,
+                                                chip->regs + ATMEL_PDC_RNCR);
+                                snd_pcm_period_elapsed(chip->capture_substream);
+                        }
+                }
                 retval = IRQ_HANDLED;
         }
 
@@ -608,15 +721,50 @@ static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
         return retval;
 }
 
+static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
+        /* Playback */
+        {
+                .exclusive = 1,
+                .r = { {
+                        .slots = ((1 << AC97_SLOT_PCM_LEFT)
+                                  | (1 << AC97_SLOT_PCM_RIGHT)),
+                } },
+        },
+        /* PCM in */
+        {
+                .stream = 1,
+                .exclusive = 1,
+                .r = { {
+                        .slots = ((1 << AC97_SLOT_PCM_LEFT)
+                                        | (1 << AC97_SLOT_PCM_RIGHT)),
+                } }
+        },
+        /* Mic in */
+        {
+                .stream = 1,
+                .exclusive = 1,
+                .r = { {
+                        .slots = (1<<AC97_SLOT_MIC),
+                } }
+        },
+};
+
 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
 {
         struct snd_pcm          *pcm;
         struct snd_pcm_hardware hw = atmel_ac97c_hw;
-        int                     capture, playback, retval;
+        int                     capture, playback, retval, err;
 
         capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
         playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
 
+        if (!cpu_is_at32ap7000()) {
+                err = snd_ac97_pcm_assign(chip->ac97_bus,
+                                ARRAY_SIZE(at91_ac97_pcm_defs),
+                                at91_ac97_pcm_defs);
+                if (err)
+                        return err;
+        }
         retval = snd_pcm_new(chip->card, chip->card->shortname,
                         chip->pdev->id, playback, capture, &pcm);
         if (retval)
@@ -775,7 +923,12 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
                 return -ENXIO;
         }
 
-        pclk = clk_get(&pdev->dev, "pclk");
+        if (cpu_is_at32ap7000()) {
+                pclk = clk_get(&pdev->dev, "pclk");
+        } else {
+                pclk = clk_get(&pdev->dev, "ac97_clk");
+        }
+
         if (IS_ERR(pclk)) {
                 dev_dbg(&pdev->dev, "no peripheral clock\n");
                 return PTR_ERR(pclk);
@@ -844,43 +997,52 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
                 goto err_ac97_bus;
         }
 
-        if (pdata->rx_dws.dma_dev) {
-                struct dw_dma_slave *dws = &pdata->rx_dws;
-                dma_cap_mask_t mask;
+        if (cpu_is_at32ap7000()) {
+                if (pdata->rx_dws.dma_dev) {
+                        struct dw_dma_slave *dws = &pdata->rx_dws;
+                        dma_cap_mask_t mask;
 
-                dws->rx_reg = regs->start + AC97C_CARHR + 2;
+                        dws->rx_reg = regs->start + AC97C_CARHR + 2;
 
-                dma_cap_zero(mask);
-                dma_cap_set(DMA_SLAVE, mask);
+                        dma_cap_zero(mask);
+                        dma_cap_set(DMA_SLAVE, mask);
 
-                chip->dma.rx_chan = dma_request_channel(mask, filter, dws);
+                        chip->dma.rx_chan = dma_request_channel(mask, filter,
+                                                                dws);
 
-                dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
+                        dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
                                 dev_name(&chip->dma.rx_chan->dev->device));
-                set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
-        }
+                        set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+                }
 
-        if (pdata->tx_dws.dma_dev) {
-                struct dw_dma_slave *dws = &pdata->tx_dws;
-                dma_cap_mask_t mask;
+                if (pdata->tx_dws.dma_dev) {
+                        struct dw_dma_slave *dws = &pdata->tx_dws;
+                        dma_cap_mask_t mask;
 
-                dws->tx_reg = regs->start + AC97C_CATHR + 2;
+                        dws->tx_reg = regs->start + AC97C_CATHR + 2;
 
-                dma_cap_zero(mask);
-                dma_cap_set(DMA_SLAVE, mask);
+                        dma_cap_zero(mask);
+                        dma_cap_set(DMA_SLAVE, mask);
 
-                chip->dma.tx_chan = dma_request_channel(mask, filter, dws);
+                        chip->dma.tx_chan = dma_request_channel(mask, filter,
+                                                                dws);
 
-                dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
+                        dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
                                 dev_name(&chip->dma.tx_chan->dev->device));
-                set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
-        }
+                        set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+                }
 
-        if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
-                        !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
-                dev_dbg(&pdev->dev, "DMA not available\n");
-                retval = -ENODEV;
-                goto err_dma;
+                if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
+                                !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
+                        dev_dbg(&pdev->dev, "DMA not available\n");
+                        retval = -ENODEV;
+                        goto err_dma;
+                }
+        } else {
+                /* Just pretend that we have DMA channel(for at91 i is actually
+                 * the PDC) */
+                set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+                set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
         }
 
         retval = atmel_ac97c_pcm_new(chip);
@@ -897,20 +1059,22 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, card);
 
-        dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p\n",
-                        chip->regs);
+        dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
+                        chip->regs, irq);
 
         return 0;
 
 err_dma:
-        if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
-                dma_release_channel(chip->dma.rx_chan);
-        if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
-                dma_release_channel(chip->dma.tx_chan);
-        clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
-        clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
-        chip->dma.rx_chan = NULL;
-        chip->dma.tx_chan = NULL;
+        if (cpu_is_at32ap7000()) {
+                if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
+                        dma_release_channel(chip->dma.rx_chan);
+                if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
+                        dma_release_channel(chip->dma.tx_chan);
+                clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+                clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+                chip->dma.rx_chan = NULL;
+                chip->dma.tx_chan = NULL;
+        }
 err_ac97_bus:
         snd_card_set_dev(card, NULL);
 
@@ -934,10 +1098,12 @@ static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
         struct snd_card *card = platform_get_drvdata(pdev);
         struct atmel_ac97c *chip = card->private_data;
 
-        if (test_bit(DMA_RX_READY, &chip->flags))
-                dw_dma_cyclic_stop(chip->dma.rx_chan);
-        if (test_bit(DMA_TX_READY, &chip->flags))
-                dw_dma_cyclic_stop(chip->dma.tx_chan);
+        if (cpu_is_at32ap7000()) {
+                if (test_bit(DMA_RX_READY, &chip->flags))
+                        dw_dma_cyclic_stop(chip->dma.rx_chan);
+                if (test_bit(DMA_TX_READY, &chip->flags))
+                        dw_dma_cyclic_stop(chip->dma.tx_chan);
+        }
         clk_disable(chip->pclk);
 
         return 0;
@@ -949,11 +1115,12 @@ static int atmel_ac97c_resume(struct platform_device *pdev)
         struct atmel_ac97c *chip = card->private_data;
 
         clk_enable(chip->pclk);
-        if (test_bit(DMA_RX_READY, &chip->flags))
-                dw_dma_cyclic_start(chip->dma.rx_chan);
-        if (test_bit(DMA_TX_READY, &chip->flags))
-                dw_dma_cyclic_start(chip->dma.tx_chan);
-
+        if (cpu_is_at32ap7000()) {
+                if (test_bit(DMA_RX_READY, &chip->flags))
+                        dw_dma_cyclic_start(chip->dma.rx_chan);
+                if (test_bit(DMA_TX_READY, &chip->flags))
+                        dw_dma_cyclic_start(chip->dma.tx_chan);
+        }
         return 0;
 }
 #else
@@ -978,14 +1145,16 @@ static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
         iounmap(chip->regs);
         free_irq(chip->irq, chip);
 
-        if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
-                dma_release_channel(chip->dma.rx_chan);
-        if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
-                dma_release_channel(chip->dma.tx_chan);
-        clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
-        clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
-        chip->dma.rx_chan = NULL;
-        chip->dma.tx_chan = NULL;
+        if (cpu_is_at32ap7000()) {
+                if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
+                        dma_release_channel(chip->dma.rx_chan);
+                if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
+                        dma_release_channel(chip->dma.tx_chan);
+                clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
+                clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
+                chip->dma.rx_chan = NULL;
+                chip->dma.tx_chan = NULL;
+        }
 
         snd_card_set_dev(card, NULL);
         snd_card_free(card);