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authorChris Metcalf <cmetcalf@tilera.com>2013-08-05 13:40:47 -0400
committerChris Metcalf <cmetcalf@tilera.com>2013-08-06 12:56:00 -0400
commitdc7d5cf2cab6d1fbb43c5c0569f43b7e4c822760 (patch)
tree1260be5d29786ad3ac5e515d2033095721a31c9b /arch/tile/include/asm
parent8d9e53b93de7383d5bb4b3507f146bfcd83c6e5d (diff)
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tile PCI RC: add dma_get_required_mask()
The standard kernel function dma_get_required_mask() uses the highest DRAM address to determine if 32-bit or 64-bit DMA addressing is needed. This only works on architectures that have direct mapping between the PA and the PCI address space, i.e. those that don't have I/O TLBs or have I/O TLB but choose to use direct mapping. Neither of these are true for tilegx. Whether to use 64-bit DMA should depend on the PCI device's capability only, not on the amount of DRAM installeds, so we now advertise a 64-bit DMA mask unconditionally. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/include/asm')
-rw-r--r--arch/tile/include/asm/dma-mapping.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index 4a60059876e6..6f522d569132 100644
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h
@@ -20,6 +20,10 @@
#include <linux/cache.h>
#include <linux/io.h>
+#ifdef __tilegx__
+#define ARCH_HAS_DMA_GET_REQUIRED_MASK
+#endif
+
extern struct dma_map_ops *tile_dma_map_ops;
extern struct dma_map_ops *gx_pci_dma_map_ops;
extern struct dma_map_ops *gx_legacy_pci_dma_map_ops;