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MIPS: Allow MAX_DMA32_PFN to be overridden.

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

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1633/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
David Daney 15 years ago
parent
f12990720c
commit
cfd570990f
1 changed files with 3 additions and 0 deletions
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  1. 3 0
      arch/mips/include/asm/dma.h

+ 3 - 0
arch/mips/include/asm/dma.h
View File 

@@ -91,7 +91,10 @@
 
 #define MAX_DMA_ADDRESS		(PAGE_OFFSET + 0x01000000)
 
 #define MAX_DMA_ADDRESS		(PAGE_OFFSET + 0x01000000)
 
 #endif
 
 #endif
 
 #define MAX_DMA_PFN		PFN_DOWN(virt_to_phys((void *)MAX_DMA_ADDRESS))
 
 #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))
 
 #define MAX_DMA32_PFN		(1UL << (32 - PAGE_SHIFT))
 
+#endif
 
 
 
 /* 8237 DMA controllers */
 
 /* 8237 DMA controllers */
 
 #define IO_DMA1_BASE	0x00	/* 8 bit slave DMA, channels 0..3 */
 
 #define IO_DMA1_BASE	0x00	/* 8 bit slave DMA, channels 0..3 */