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authorRalf Baechle <ralf@linux-mips.org>2007-11-03 02:05:43 +0000
committerRalf Baechle <ralf@linux-mips.org>2007-11-26 17:26:14 +0000
commitcce335ae47e231398269fb05fa48e0e9cbf289e0 (patch)
treea01ea9ad318d459393a905df5c53b68b754300da /include
parent940f6b48a130e0a33cb8bd397dd0e277166470ad (diff)
[MIPS] 64-bit Sibyte kernels need DMA32.
Sibyte SOCs only have 32-bit PCI. Due to the sparse use of the address space only the first 1GB of memory is mapped at physical addresses below 1GB. If a system has more than 1GB of memory 32-bit DMA will not be able to reach all of it. For now this patch is good enough to keep Sibyte users happy but it seems eventually something like swiotlb will be needed for Sibyte. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-mips/dma.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-mips/dma.h b/include/asm-mips/dma.h
index 833437d31ef..d6a6c21f16d 100644
--- a/include/asm-mips/dma.h
+++ b/include/asm-mips/dma.h
@@ -92,6 +92,7 @@
#define MAX_DMA_ADDRESS (PAGE_OFFSET + 0x01000000)
#endif
#define MAX_DMA_PFN PFN_DOWN(virt_to_phys((void *)MAX_DMA_ADDRESS))
+#define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT))
/* 8237 DMA controllers */
#define IO_DMA1_BASE 0x00 /* 8 bit slave DMA, channels 0..3 */