Lephe acc35d774f dma: add an asynchronous API ... This change adds asynchronous capabilities to the DMA API. Previously, transfers would start asynchronously but could only be completed by a call to dma_transfer_wait(). The API now supports a callback, as well as the dma_transfer_sync() variant, to be consistent with the upcoming USB API that has both _sync and _async versions of functions. The interrupt handler of the DMA was changed to include a return to userland, which is required to perform the callback. * dma_transfer() is now an obsolete synonym for dma_transfer_async() with no callback. * dma_transfer_noint() is now a synonym for dma_transfer_atomic(), for consistency with the upcoming USB API.		2021-05-12 09:17:24 +02:00
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r61524.c	dma: add an asynchronous API	2021-05-12 09:17:24 +02:00