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ALSA: Add SoC on-chip internal ram support for DMA buffer allocation

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Now it's quite common that an SoC contains its on-chip internal RAM.
By using this RAM space for DMA buffer during audio playback/record,
we can shutdown the voltage for external RAM to save power.

So add new DEV type with iram malloc()/free() and accordingly modify
current default mmap() for the iram circumstance.

Signed-off-by: Nicolin Chen <[email protected]>
Reviewed-by: Lars-Peter Clausen <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Nicolin Chen 2013-10-23 11:47:43 +08:00 • committed by Takashi Iwai
commit 055032142c
3 changed files with 59 additions and 0 deletions
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1
include/sound/memalloc.h
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@ -52,6 +52,7 @@ struct snd_dma_device {
#else
#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
#endif
#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
/*
* info for buffer allocation