Commit graph

6 commits

Author SHA1 Message Date
Shawn Guo
6f1fd93e30 ASoC: generic-dmaengine-pcm: call dma_request_slave_channel()
dma_request_slave_channel() is a more appropriate API for dmaengine
clients that adopt generic DMA bindings to call.  Let's use it instead
of of_dma_request_slave_channel() to save <linux/of_dma.h> include.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-04-23 11:34:29 +01:00
Shawn Guo
19133d2cfd ASoC: generic-dmaengine-pcm: use a more common dma name
The examples in Documentation/devicetree/bindings/dma/dma.txt recommends
the name for dma channel doing both RX and TX to be "rx-tx".  This
becomes a common pattern that has been adopted by platforms that
converts to generic DMA bindings.  Let's follow this common pattern in
generic-dmaengine-pcm.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-04-23 11:34:09 +01:00
Lars-Peter Clausen
d1e1406c6e ASoC: generic-dmaengine-pcm: Add support for half-duplex
Some platforms which are half-duplex share the same DMA channel between the
playback and capture stream. Add support for this to the generic dmaengine PCM
driver.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-04-22 11:27:04 +01:00
Lars-Peter Clausen
610f780050 ASoC: dmaengine-pcm: Add support for platforms which can't report residue
Unfortunately there are still quite a few platforms with a dmaengine driver
which do not support reporting the number of bytes left to transfer. If we want
to support these platforms in the generic dmaengine PCM driver we have.

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>
2013-04-17 14:25:56 +01:00
Lars-Peter Clausen
c999836d37 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>
2013-04-17 14:21:36 +01:00
Lars-Peter Clausen
28c4468b00 ASoC: Add a generic dmaengine_pcm driver
This patch adds a generic dmaengine PCM driver. It builds on top of the
dmaengine PCM library and adds the missing pieces like DMA channel management,
buffer management and channel configuration. It will be able to replace the
majority of the existing platform specific dmaengine based PCM drivers.
Devicetree is used to map the DMA channels to the PCM device.

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>
2013-04-17 14:21:25 +01:00