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ASoC: ux500: Use generic dmaengine PCM
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Use the generic dmaengine PCM driver instead of a custom implemention.  There is
a minor functional change, the ux500 PCM driver did not preallocate the audio
buffer, while the generic dmaengine PCM driver will do this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Lars-Peter Clausen authored and Mark Brown committed Apr 18, 2013
1 parent adaa322 commit 22f38f7
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Showing 3 changed files with 19 additions and 144 deletions.
2 changes: 1 addition & 1 deletion include/sound/dmaengine_pcm.h
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Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,7 @@ void snd_dmaengine_pcm_set_config_from_dai_data(
*/
#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1)
/*
* The platforms dmaengine driver does not support reporting the ammount of
* The platforms dmaengine driver does not support reporting the amount of
* bytes that are still left to transfer.
*/
#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(2)
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2 changes: 1 addition & 1 deletion sound/soc/ux500/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ config SND_SOC_UX500_PLAT_MSP_I2S
config SND_SOC_UX500_PLAT_DMA
tristate "Platform - DB8500 (DMA)"
depends on SND_SOC_UX500
select SND_SOC_DMAENGINE_PCM
select SND_SOC_GENERIC_DMAENGINE_PCM
help
Say Y if you want to enable the Ux500 platform-driver.

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159 changes: 17 additions & 142 deletions sound/soc/ux500/ux500_pcm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@
#define UX500_PLATFORM_PERIODS_MAX 48
#define UX500_PLATFORM_BUFFER_BYTES_MAX (2048 * PAGE_SIZE)

static struct snd_pcm_hardware ux500_pcm_hw = {
static const struct snd_pcm_hardware ux500_pcm_hw = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_RESUME |
Expand All @@ -61,43 +61,23 @@ static struct snd_pcm_hardware ux500_pcm_hw = {
.periods_max = UX500_PLATFORM_PERIODS_MAX,
};

static void ux500_pcm_dma_hw_free(struct device *dev,
struct snd_pcm_substream *substream)
static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_dma_buffer *buf = runtime->dma_buffer_p;

if (runtime->dma_area == NULL)
return;

if (buf != &substream->dma_buffer) {
dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
buf->addr);
kfree(runtime->dma_buffer_p);
}

snd_pcm_set_runtime_buffer(substream, NULL);
}

static int ux500_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *dai = rtd->cpu_dai;
struct device *dev = dai->dev;
int ret;
struct ux500_msp_dma_params *dma_params;
u16 per_data_width, mem_data_width;
struct stedma40_chan_cfg *dma_cfg;
struct ux500_msp_dma_params *dma_params;

dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
snd_pcm_stream_str(substream));

dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw);
dma_params = snd_soc_dai_get_dma_data(dai, substream);
dma_cfg = dma_params->dma_cfg;

mem_data_width = STEDMA40_HALFWORD_WIDTH;

dma_params = snd_soc_dai_get_dma_data(dai, substream);
switch (dma_params->data_size) {
case 32:
per_data_width = STEDMA40_WORD_WIDTH;
Expand All @@ -110,13 +90,8 @@ static int ux500_pcm_open(struct snd_pcm_substream *substream)
break;
default:
per_data_width = STEDMA40_WORD_WIDTH;
dev_warn(rtd->platform->dev,
"%s: Unknown data-size (%d)! Assuming 32 bits.\n",
__func__, dma_params->data_size);
}

dma_cfg = dma_params->dma_cfg;

if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
dma_cfg->src_info.data_width = mem_data_width;
dma_cfg->dst_info.data_width = per_data_width;
Expand All @@ -125,123 +100,24 @@ static int ux500_pcm_open(struct snd_pcm_substream *substream)
dma_cfg->dst_info.data_width = mem_data_width;
}

ret = snd_dmaengine_pcm_open_request_chan(substream, stedma40_filter,
dma_cfg);
if (ret) {
dev_dbg(dai->dev,
"%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
__func__, ret);
return ret;
}

return 0;
}

static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_dma_buffer *buf = runtime->dma_buffer_p;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
int ret = 0;
int size;

dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

size = params_buffer_bytes(hw_params);

if (buf) {
if (buf->bytes >= size)
goto out;
ux500_pcm_dma_hw_free(NULL, substream);
}

if (substream->dma_buffer.area != NULL &&
substream->dma_buffer.bytes >= size) {
buf = &substream->dma_buffer;
} else {
buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
if (!buf)
goto nomem;

buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = NULL;
buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
GFP_KERNEL);
buf->bytes = size;
buf->private_data = NULL;

if (!buf->area)
goto free;
}
snd_pcm_set_runtime_buffer(substream, buf);
ret = 1;
out:
runtime->dma_bytes = size;
return ret;

free:
kfree(buf);
nomem:
return -ENOMEM;
}

static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;

dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

ux500_pcm_dma_hw_free(NULL, substream);

return 0;
return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
}

static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;

dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);

return dma_mmap_coherent(NULL, vma, runtime->dma_area,
runtime->dma_addr, runtime->dma_bytes);
}

static struct snd_pcm_ops ux500_pcm_ops = {
.open = ux500_pcm_open,
.close = snd_dmaengine_pcm_close_release_chan,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = ux500_pcm_hw_params,
.hw_free = ux500_pcm_hw_free,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer_no_residue,
.mmap = ux500_pcm_mmap
};

int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_pcm *pcm = rtd->pcm;

dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
pcm->id);

pcm->info_flags = 0;

return 0;
}

static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
.ops = &ux500_pcm_ops,
.pcm_new = ux500_pcm_new,
static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
.pcm_hardware = &ux500_pcm_hw,
.compat_request_channel = ux500_pcm_request_chan,
.prealloc_buffer_size = 128 * 1024,
};

int ux500_pcm_register_platform(struct platform_device *pdev)
{
int ret;

ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
ret = snd_dmaengine_pcm_register(&pdev->dev,
&ux500_dmaengine_pcm_config,
SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
SND_DMAENGINE_PCM_FLAG_COMPAT |
SND_DMAENGINE_PCM_FLAG_NO_DT);
if (ret < 0) {
dev_err(&pdev->dev,
"%s: ERROR: Failed to register platform '%s' (%d)!\n",
Expand All @@ -255,8 +131,7 @@ EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);

int ux500_pcm_unregister_platform(struct platform_device *pdev)
{
snd_soc_unregister_platform(&pdev->dev);

snd_dmaengine_pcm_unregister(&pdev->dev);
return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);

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