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| author | David Daney <ddaney@caviumnetworks.com> | 2010-10-01 13:27:29 -0700 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-10-29 19:08:29 +0100 |
| commit | 57575b5c81d9ced1133719bba82a65440371a010 (patch) | |
| tree | 7dac2f6d7e7da5ca3d679b4ae87ebd378065c02b /arch/mips | |
| parent | cfd570990f863de90a86da73ef7b7d84e5190647 (diff) | |
| download | linux-stable-57575b5c81d9ced1133719bba82a65440371a010.tar.gz linux-stable-57575b5c81d9ced1133719bba82a65440371a010.tar.bz2 linux-stable-57575b5c81d9ced1133719bba82a65440371a010.zip | |
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>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h | 6 |
1 files changed, 6 insertions, 0 deletions
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 |