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| author | David Daney <ddaney@caviumnetworks.com> | 2010-10-01 13:27:28 -0700 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-10-29 19:08:28 +0100 |
| commit | cfd570990f863de90a86da73ef7b7d84e5190647 (patch) | |
| tree | 3326708ee363f1266041981465076ec1927f0b95 | |
| parent | f12990720c5f9bc156ab3e992d3a1c2f43d8d51a (diff) | |
| download | lwn-cfd570990f863de90a86da73ef7b7d84e5190647.tar.gz lwn-cfd570990f863de90a86da73ef7b7d84e5190647.zip | |
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>
| -rw-r--r-- | 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 1353c81065d1..2d47da62d5a7 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 */ |