diff options
| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-05 13:40:47 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-06 12:56:00 -0400 |
| commit | dc7d5cf2cab6d1fbb43c5c0569f43b7e4c822760 (patch) | |
| tree | 1260be5d29786ad3ac5e515d2033095721a31c9b /arch/tile/include | |
| parent | 8d9e53b93de7383d5bb4b3507f146bfcd83c6e5d (diff) | |
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')
| -rw-r--r-- | arch/tile/include/asm/dma-mapping.h | 4 |
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 4a60059876e..6f522d56913 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; |