[alsa-devel] [PATCH 4/8] ASoC: mxs: Use generic dmaengine PCM
Lars-Peter Clausen
lars at metafoo.de
Sat Apr 20 19:29:03 CEST 2013
Use the generic dmaengine PCM driver instead of a custom implementation.
Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
---
Changes since v1:
Set SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX to reflect that the DMA channel is
shared between playback and capture
---
sound/soc/mxs/Kconfig | 2 +-
sound/soc/mxs/mxs-pcm.c | 136 ++++--------------------------------------------
2 files changed, 12 insertions(+), 126 deletions(-)
diff --git a/sound/soc/mxs/Kconfig b/sound/soc/mxs/Kconfig
index b6fa776..78d321c 100644
--- a/sound/soc/mxs/Kconfig
+++ b/sound/soc/mxs/Kconfig
@@ -1,7 +1,7 @@
menuconfig SND_MXS_SOC
tristate "SoC Audio for Freescale MXS CPUs"
depends on ARCH_MXS
- select SND_SOC_DMAENGINE_PCM
+ select SND_SOC_GENERIC_DMAENGINE_PCM
help
Say Y or M if you want to add support for codecs attached to
the MXS SAIF interface.
diff --git a/sound/soc/mxs/mxs-pcm.c b/sound/soc/mxs/mxs-pcm.c
index 907cdb1..b41fffc 100644
--- a/sound/soc/mxs/mxs-pcm.c
+++ b/sound/soc/mxs/mxs-pcm.c
@@ -18,27 +18,18 @@
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#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 <linux/slab.h>
-#include <linux/dmaengine.h>
#include <sound/core.h>
-#include <sound/initval.h>
#include <sound/pcm.h>
-#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "mxs-pcm.h"
-static struct snd_pcm_hardware snd_mxs_hardware = {
+static const struct snd_pcm_hardware snd_mxs_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE |
@@ -56,7 +47,6 @@ static struct snd_pcm_hardware snd_mxs_hardware = {
.periods_max = 52,
.buffer_bytes_max = 64 * 1024,
.fifo_size = 32,
-
};
static bool filter(struct dma_chan *chan, void *param)
@@ -74,129 +64,25 @@ static bool filter(struct dma_chan *chan, void *param)
return true;
}
-static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
-{
- snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
-
- return 0;
-}
-
-static int snd_mxs_open(struct snd_pcm_substream *substream)
-{
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
-
- snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
-
- return snd_dmaengine_pcm_open_request_chan(substream, filter,
- snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
-}
-
-static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
- struct vm_area_struct *vma)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
-
- return dma_mmap_writecombine(substream->pcm->card->dev, vma,
- runtime->dma_area,
- runtime->dma_addr,
- runtime->dma_bytes);
-}
-
-static struct snd_pcm_ops mxs_pcm_ops = {
- .open = snd_mxs_open,
- .close = snd_dmaengine_pcm_close_release_chan,
- .ioctl = snd_pcm_lib_ioctl,
- .hw_params = snd_mxs_pcm_hw_params,
- .trigger = snd_dmaengine_pcm_trigger,
- .pointer = snd_dmaengine_pcm_pointer_no_residue,
- .mmap = snd_mxs_pcm_mmap,
-};
-
-static int mxs_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 = snd_mxs_hardware.buffer_bytes_max;
-
- 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 mxs_pcm_dmamask = DMA_BIT_MASK(32);
-static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
-{
- struct snd_card *card = rtd->card->snd_card;
- struct snd_pcm *pcm = rtd->pcm;
- int ret = 0;
-
- if (!card->dev->dma_mask)
- card->dev->dma_mask = &mxs_pcm_dmamask;
- if (!card->dev->coherent_dma_mask)
- card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
-
- if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
- ret = mxs_pcm_preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_PLAYBACK);
- if (ret)
- goto out;
- }
-
- if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
- ret = mxs_pcm_preallocate_dma_buffer(pcm,
- SNDRV_PCM_STREAM_CAPTURE);
- if (ret)
- goto out;
- }
-
-out:
- return ret;
-}
-
-static void mxs_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;
- }
-}
-
-static struct snd_soc_platform_driver mxs_soc_platform = {
- .ops = &mxs_pcm_ops,
- .pcm_new = mxs_pcm_new,
- .pcm_free = mxs_pcm_free,
+static const struct snd_dmaengine_pcm_config mxs_dmaengine_pcm_config = {
+ .pcm_hardware = &snd_mxs_hardware,
+ .compat_filter_fn = filter,
+ .prealloc_buffer_size = 64 * 1024,
};
int mxs_pcm_platform_register(struct device *dev)
{
- return snd_soc_register_platform(dev, &mxs_soc_platform);
+ return snd_dmaengine_pcm_register(dev, &mxs_dmaengine_pcm_config,
+ SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
+ SND_DMAENGINE_PCM_FLAG_NO_DT |
+ SND_DMAENGINE_PCM_FLAG_COMPAT |
+ SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX);
}
EXPORT_SYMBOL_GPL(mxs_pcm_platform_register);
void mxs_pcm_platform_unregister(struct device *dev)
{
- snd_soc_unregister_platform(dev);
+ snd_dmaengine_pcm_unregister(dev);
}
EXPORT_SYMBOL_GPL(mxs_pcm_platform_unregister);
--
1.8.0
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