MIPS: Octeon: Adjust top of DMA32 zone.
On OCTEON, we reserve the last 256MB of 32-bit PCI address space, mapping the RAM in this region at a high DMA address. This makes memory in this region unavailable for 32-bit DMA. Signed-off-by: David Daney <ddaney@caviumnetworks.com> Patchwork: http://patchwork.linux-mips.org/patch/1634/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -81,4 +81,10 @@ static inline int octeon_has_saa(void)
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return id >= 0x000d0300;
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}
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/*
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* The last 256MB are reserved for device to device mappings and the
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* BAR1 hole.
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*/
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#define MAX_DMA32_PFN (((1ULL << 32) - (1ULL << 28)) >> PAGE_SHIFT)
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#endif
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