arch/tile: enable ZONE_DMA for tilegx

This is required for PCI root complex legacy support and USB OHCI root
complex support.  With this change tilegx now supports allocating memory
whose PA fits in 32 bits.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index a5302d319229..0ad771f7a7e1 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -212,6 +212,9 @@ config HIGHMEM
 
           If unsure, say "true".
 
+config ZONE_DMA
+        def_bool y
+
 # We do not currently support disabling NUMA.
 config NUMA
         bool # "NUMA Memory Allocation and Scheduler Support"