MIPS: Allow MAX_DMA32_PFN to be overridden.
authorDavid Daney <ddaney@caviumnetworks.com>
Fri, 1 Oct 2010 20:27:28 +0000 (13:27 -0700)
committerRalf Baechle <ralf@linux-mips.org>
Fri, 29 Oct 2010 18:08:28 +0000 (19:08 +0100)
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>
arch/mips/include/asm/dma.h

index 1353c81065d1808d252d97b339fe34a052cca480..2d47da62d5a7d25dec4c4361c15e2170770158ee 100644 (file)
 #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 */