[alsa-devel] [PATCH 17/17] ASoC: ux500: Use generic dmaengine PCM
Lars-Peter Clausen
lars at metafoo.de
Mon Apr 15 19:20:04 CEST 2013
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 at metafoo.de>
---
include/sound/dmaengine_pcm.h | 2 +-
sound/soc/ux500/Kconfig | 2 +-
sound/soc/ux500/ux500_pcm.c | 159 +++++-------------------------------------
3 files changed, 19 insertions(+), 144 deletions(-)
diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h
index e705286..b1d1150 100644
--- a/include/sound/dmaengine_pcm.h
+++ b/include/sound/dmaengine_pcm.h
@@ -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)
diff --git a/sound/soc/ux500/Kconfig b/sound/soc/ux500/Kconfig
index 069330d..c73c590 100644
--- a/sound/soc/ux500/Kconfig
+++ b/sound/soc/ux500/Kconfig
@@ -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.
diff --git a/sound/soc/ux500/ux500_pcm.c b/sound/soc/ux500/ux500_pcm.c
index a7d4f04..b6e5ae2 100644
--- a/sound/soc/ux500/ux500_pcm.c
+++ b/sound/soc/ux500/ux500_pcm.c
@@ -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 |
@@ -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;
@@ -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;
@@ -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",
@@ -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);
--
1.8.0
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