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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>
This commit is contained in:
Sedji Gaouaou 2010-03-01 12:19:18 +01:00 committed by Takashi Iwai
parent ae76148114
commit 7177395fdd
2 changed files with 255 additions and 86 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sound/atmel/Kconfig
View 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.

339
sound/atmel/ac97c.c
View 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>
@ -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);