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powerpc: Add support for swiotlb on 32-bit

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This patch includes the basic infrastructure to use swiotlb
bounce buffering on 32-bit powerpc.  It is not yet enabled on
any platforms.  Probably the most interesting bit is the
addition of addr_needs_map to dma_ops - we need this as
a dma_op because the decision of whether or not an addr
can be mapped by a device is device-specific.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Becky Bruce
2009-05-14 12:42:28 +00:00
committed by Benjamin Herrenschmidt
parent 1babddbc2e
commit ec3cf2ece2
8 changed files with 226 additions and 2 deletions
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2
arch/powerpc/kernel/dma.c
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@ -19,7 +19,7 @@
* default the offset is PCI_DRAM_OFFSET.
*/
static unsigned long get_dma_direct_offset(struct device *dev)
unsigned long get_dma_direct_offset(struct device *dev)
{
if (dev)
return (unsigned long)dev->archdata.dma_data;