forked from luck/tmp_suning_uos_patched
ASoC: dmaengine_pcm: Add support for compat platforms
Add support for platforms which don't use devicetree yet or have to optionally support a non-devicetree way to request the DMA channel. The patch adds the compat_request_channel and compat_filter_fn callbacks to the snd_dmaengine_pcm_config struct. If the compat_request_channel is implemented it will be used to request the DMA channel. If not dma_request_channel with compat_filter_fn as the filter function will be used to request the channel. The patch also exports the snd_dmaengine_pcm_request_chan() function, since compat platforms will want to use it to request their DMA channel. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Stephen Warren <swarren@nvidia.com> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
parent
28c4468b00
commit
c999836d37
|
@ -16,6 +16,7 @@
|
|||
#define __SOUND_DMAENGINE_PCM_H__
|
||||
|
||||
#include <sound/pcm.h>
|
||||
#include <sound/soc.h>
|
||||
#include <linux/dmaengine.h>
|
||||
|
||||
/**
|
||||
|
@ -46,6 +47,8 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
|
|||
dma_filter_fn filter_fn, void *filter_data);
|
||||
int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream);
|
||||
|
||||
struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
|
||||
void *filter_data);
|
||||
struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
|
||||
|
||||
/**
|
||||
|
@ -72,17 +75,43 @@ void snd_dmaengine_pcm_set_config_from_dai_data(
|
|||
const struct snd_dmaengine_dai_dma_data *dma_data,
|
||||
struct dma_slave_config *config);
|
||||
|
||||
|
||||
/*
|
||||
* Try to request the DMA channel using compat_request_channel or
|
||||
* compat_filter_fn if it couldn't be requested through devicetree.
|
||||
*/
|
||||
#define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0)
|
||||
/*
|
||||
* Don't try to request the DMA channels through devicetree. This flag only
|
||||
* makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well.
|
||||
*/
|
||||
#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1)
|
||||
|
||||
/**
|
||||
* struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM
|
||||
* @prepare_slave_config: Callback used to fill in the DMA slave_config for a
|
||||
* PCM substream. Will be called from the PCM drivers hwparams callback.
|
||||
* @compat_request_channel: Callback to request a DMA channel for platforms
|
||||
* which do not use devicetree.
|
||||
* @compat_filter_fn: Will be used as the filter function when requesting a
|
||||
* channel for platforms which do not use devicetree. The filter parameter
|
||||
* will be the DAI's DMA data.
|
||||
* @pcm_hardware: snd_pcm_hardware struct to be used for the PCM.
|
||||
* @prealloc_buffer_size: Size of the preallocated audio buffer.
|
||||
*
|
||||
* Note: If both compat_request_channel and compat_filter_fn are set
|
||||
* compat_request_channel will be used to request the channel and
|
||||
* compat_filter_fn will be ignored. Otherwise the channel will be requested
|
||||
* using dma_request_channel with compat_filter_fn as the filter function.
|
||||
*/
|
||||
struct snd_dmaengine_pcm_config {
|
||||
int (*prepare_slave_config)(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_hw_params *params,
|
||||
struct dma_slave_config *slave_config);
|
||||
struct dma_chan *(*compat_request_channel)(
|
||||
struct snd_soc_pcm_runtime *rtd,
|
||||
struct snd_pcm_substream *substream);
|
||||
dma_filter_fn compat_filter_fn;
|
||||
|
||||
const struct snd_pcm_hardware *pcm_hardware;
|
||||
unsigned int prealloc_buffer_size;
|
||||
|
|
|
@ -254,7 +254,16 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
|
||||
|
||||
static struct dma_chan *dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
|
||||
/**
|
||||
* snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM
|
||||
* @filter_fn: Filter function used to request the DMA channel
|
||||
* @filter_data: Data passed to the DMA filter function
|
||||
*
|
||||
* Returns NULL or the requested DMA channel.
|
||||
*
|
||||
* This function request a DMA channel for usage with dmaengine PCM.
|
||||
*/
|
||||
struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
|
||||
void *filter_data)
|
||||
{
|
||||
dma_cap_mask_t mask;
|
||||
|
@ -265,6 +274,7 @@ static struct dma_chan *dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
|
|||
|
||||
return dma_request_channel(mask, filter_fn, filter_data);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel);
|
||||
|
||||
/**
|
||||
* snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
|
||||
|
@ -320,7 +330,7 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
|
|||
dma_filter_fn filter_fn, void *filter_data)
|
||||
{
|
||||
return snd_dmaengine_pcm_open(substream,
|
||||
dmaengine_pcm_request_channel(filter_fn, filter_data));
|
||||
snd_dmaengine_pcm_request_channel(filter_fn, filter_data));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
|
||||
|
||||
|
|
|
@ -29,6 +29,7 @@ struct dmaengine_pcm {
|
|||
struct dma_chan *chan[SNDRV_PCM_STREAM_CAPTURE + 1];
|
||||
const struct snd_dmaengine_pcm_config *config;
|
||||
struct snd_soc_platform platform;
|
||||
bool compat;
|
||||
};
|
||||
|
||||
static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
|
||||
|
@ -121,6 +122,19 @@ static void dmaengine_pcm_free(struct snd_pcm *pcm)
|
|||
snd_pcm_lib_preallocate_free_for_all(pcm);
|
||||
}
|
||||
|
||||
static struct dma_chan *dmaengine_pcm_compat_request_channel(
|
||||
struct snd_soc_pcm_runtime *rtd,
|
||||
struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
|
||||
|
||||
if (pcm->config->compat_request_channel)
|
||||
return pcm->config->compat_request_channel(rtd, substream);
|
||||
|
||||
return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
|
||||
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
|
||||
}
|
||||
|
||||
static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
|
||||
{
|
||||
struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
|
||||
|
@ -134,6 +148,11 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
|
|||
if (!substream)
|
||||
continue;
|
||||
|
||||
if (!pcm->chan[i] && pcm->compat) {
|
||||
pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
|
||||
substream);
|
||||
}
|
||||
|
||||
if (!pcm->chan[i]) {
|
||||
dev_err(rtd->platform->dev,
|
||||
"Missing dma channel for stream: %d\n", i);
|
||||
|
@ -171,6 +190,7 @@ static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
|
|||
.ops = &dmaengine_pcm_ops,
|
||||
.pcm_new = dmaengine_pcm_new,
|
||||
.pcm_free = dmaengine_pcm_free,
|
||||
.probe_order = SND_SOC_COMP_ORDER_LATE,
|
||||
};
|
||||
|
||||
static const char * const dmaengine_pcm_dma_channel_names[] = {
|
||||
|
@ -190,18 +210,20 @@ int snd_dmaengine_pcm_register(struct device *dev,
|
|||
struct dmaengine_pcm *pcm;
|
||||
unsigned int i;
|
||||
|
||||
if (!dev->of_node)
|
||||
return -EINVAL;
|
||||
|
||||
pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
|
||||
if (!pcm)
|
||||
return -ENOMEM;
|
||||
|
||||
pcm->config = config;
|
||||
|
||||
for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
|
||||
pcm->chan[i] = of_dma_request_slave_channel(dev->of_node,
|
||||
if (flags & SND_DMAENGINE_PCM_FLAG_COMPAT)
|
||||
pcm->compat = true;
|
||||
|
||||
if (!(flags & SND_DMAENGINE_PCM_FLAG_NO_DT) && dev->of_node) {
|
||||
for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
|
||||
pcm->chan[i] = of_dma_request_slave_channel(dev->of_node,
|
||||
dmaengine_pcm_dma_channel_names[i]);
|
||||
}
|
||||
}
|
||||
|
||||
return snd_soc_add_platform(dev, &pcm->platform,
|
||||
|
|
Loading…
Reference in New Issue
Block a user