[PATCH 2/8] MIPS: Allow MAX_DMA32_PFN to be overridden.

[David Daney <ddaney@caviumnetworks.com>]

DMA mapping may reduce the usable physical address range usable for
32-bit DMA.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
---
 arch/mips/include/asm/dma.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/mips/include/asm/dma.h b/arch/mips/include/asm/dma.h
index 1353c81..2d47da6 100644
--- a/arch/mips/include/asm/dma.h
+++ b/arch/mips/include/asm/dma.h
@@ -91,7 +91,10 @@
 #define MAX_DMA_ADDRESS                (PAGE_OFFSET + 0x01000000)
 #endif
 #define MAX_DMA_PFN            PFN_DOWN(virt_to_phys((void *)MAX_DMA_ADDRESS))
+
+#ifndef MAX_DMA32_PFN
 #define MAX_DMA32_PFN          (1UL << (32 - PAGE_SHIFT))
+#endif
 
 /* 8237 DMA controllers */
 #define IO_DMA1_BASE   0x00    /* 8 bit slave DMA, channels 0..3 */
-- 
1.7.2.2