Dan Williams 7bf649aee8 iop-adma: P+Q support for iop13xx adma engines ... iop33x support is not included because that engine is a bit more awkward to handle in that it can either be in xor mode or pq mode. The dmaengine/async_tx layers currently only comprehend static capabilities. Note iop13xx does not support hardware PQ continuation so the driver must handle the DMA_PREP_CONTINUE flag for operations across > 16 sources. From the comment for dma_maxpq: /* When an engine does not support native continuation we need 3 extra * source slots to reuse P and Q with the following coefficients: * 1/ {00} * P : remove P from Q', but use it as a source for P' * 2/ {01} * Q : use Q to continue Q' calculation * 3/ {00} * Q : subtract Q from P' to cancel (2) */ Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2009-08-29 19:12:39 -07:00
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asm	iop-adma: P+Q support for iop13xx adma engines	2009-08-29 19:12:39 -07:00