ALSA: AC97: add AC97 support for AT91.
Sedji Gaouaou [Mon, 1 Mar 2010 11:19:18 +0000 (12:19 +0100)]
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>

sound/atmel/Kconfig
sound/atmel/ac97c.c

index 6c228a9..94de43a 100644 (file)
@@ -12,7 +12,7 @@ config SND_ATMEL_AC97C
        tristate "Atmel AC97 Controller (AC97C) driver"
        select SND_PCM
        select SND_AC97_CODEC
-       depends on DW_DMAC && AVR32
+       depends on (DW_DMAC && AVR32) || ARCH_AT91
        help
          ALSA sound driver for the Atmel AC97 controller.
 
index 0c0f877..3c0a6f4 100644 (file)
@@ -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>
 
 #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);