[PATCH 5/5] powerpc: Add 86xx support for SWIOTLB

[Becky Bruce <beckyb@kernel.crashing.org>]

Minor code to allow enabling swiotlb on mpc86xx, including
Kconfig addition for SWIOTLB.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
---
 arch/powerpc/Kconfig                       |   10 ++++++++++
 arch/powerpc/kernel/dma-swiotlb.c          |    2 ++
 arch/powerpc/platforms/86xx/mpc86xx_hpcn.c |    3 +++
 3 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 197f6a3..e47c81d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -292,6 +292,16 @@ config IOMMU_VMERGE
 config IOMMU_HELPER
 	def_bool PPC64
 
+config SWIOTLB
+	bool "SWIOTLB support"
+	depends on PPC_86xx
+	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.
+
 config PPC_NEED_DMA_SYNC_OPS
 	def_bool y
 	depends on (NOT_COHERENT_CACHE || SWIOTLB)
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 29a68e6..3065d03 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -159,3 +159,5 @@ static int __init setup_bus_notifier(void)
 
 	return 0;
 }
+
+machine_arch_initcall(mpc86xx_hpcn, setup_bus_notifier);
diff --git a/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c b/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
index c4ec49b..f7b88b9 100644
--- a/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
+++ b/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
@@ -88,6 +88,9 @@ mpc86xx_hpcn_setup_arch(void)
 
 	ppc_md.pci_exclude_device = mpc86xx_exclude_device;
 
+#ifdef CONFIG_SWIOTLB
+	set_pci_dma_ops(&swiotlb_pci_dma_ops);
+#endif
 #endif
 
 	printk("MPC86xx HPCN board from Freescale Semiconductor\n");
-- 
1.6.0.6