Commit 57575b5c authored Oct 01, 2010 by David Daney Committed by Ralf Baechle Oct 29, 2010

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>

parent cfd57099

arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -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