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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>
hifive-unleashed-5.1
David Daney 2010-10-01 13:27:29 -07:00 committed by Ralf Baechle
parent cfd570990f
commit 57575b5c81
1 changed files with 6 additions and 0 deletions
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6
arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h
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@ -81,4 +81,10 @@ static inline int octeon_has_saa(void)
return id >= 0x000d0300;
}
/*
* The last 256MB are reserved for device to device mappings and the
* BAR1 hole.
*/
#define MAX_DMA32_PFN (((1ULL << 32) - (1ULL << 28)) >> PAGE_SHIFT)
#endif