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authorBecky Bruce <beckyb@kernel.crashing.org>2009-05-14 12:42:28 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-06-09 06:49:18 (GMT)
commitec3cf2ece22a8ede7478bf38e2a818986322662b (patch)
tree76654ac60da3d2ac27f49769f825215d55b03276 /arch/powerpc/Kconfig
parent1babddbc2e83ab98fc4dd0a3e9bd7b2d30be7e32 (diff)
downloadlinux-fsl-qoriq-ec3cf2ece22a8ede7478bf38e2a818986322662b.tar.xz
powerpc: Add support for swiotlb on 32-bit
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>
Diffstat (limited to 'arch/powerpc/Kconfig')
-rw-r--r--arch/powerpc/Kconfig12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index ff75539..93a6189 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -300,9 +300,19 @@ config IOMMU_VMERGE
config IOMMU_HELPER
def_bool PPC64
+config SWIOTLB
+ bool "SWIOTLB support"
+ default n
+ select IOMMU_HELPER
+ ---help---
+ Support for IO bounce buffering for systems without an IOMMU.
+ This allows us to DMA to the full physical address space on
+ platforms where the size of a physical address is larger
+ than the bus address. Not all platforms support this.
+
config PPC_NEED_DMA_SYNC_OPS
def_bool y
- depends on NOT_COHERENT_CACHE
+ depends on (NOT_COHERENT_CACHE || SWIOTLB)
config HOTPLUG_CPU
bool "Support for enabling/disabling CPUs"