From: David Daney Date: Fri, 1 Oct 2010 20:27:29 +0000 (-0700) Subject: MIPS: Octeon: Adjust top of DMA32 zone. X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=57575b5c81d9ced1133719bba82a65440371a010;p=openwrt%2Fstaging%2Fblogic.git 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 Patchwork: http://patchwork.linux-mips.org/patch/1634/ Signed-off-by: Ralf Baechle --- diff --git a/arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h b/arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h index b952fc7215e2..c84ed74e3c8a 100644 --- a/arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h +++ b/arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h @@ -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