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ArmPkg/ArmDmaLib: add support for fixed host-to-device DMA offset

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Some devices, such as the Raspberry Pi3, have a fixed offset between memory
addresses as seen by the host and as seen by the other bus masters. So add
a new PCD that allows this fixed offset to be recorded, and to be used when
returning device addresses from the DmaLib mapping routines.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel
2016-11-12 14:02:28 +01:00
committed by Leif Lindholm
parent df8c2668d7
commit bfe34275a9
3 changed files with 27 additions and 2 deletions
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8
ArmPkg/ArmPkg.dec
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@@ -134,6 +134,14 @@
gArmTokenSpaceGuid.PcdFdSize|0|UINT32|0x0000002C
gArmTokenSpaceGuid.PcdFvSize|0|UINT32|0x0000002E
#
# Value to add to a host address to obtain a device address, using
# unsigned 64-bit integer arithmetic on both ARM and AArch64. This
# means we can rely on truncation on overflow to specify negative
# offsets.
#
gArmTokenSpaceGuid.PcdArmDmaDeviceOffset|0x0|UINT64|0x0000044
[PcdsFixedAtBuild.common, PcdsPatchableInModule.common]
gArmTokenSpaceGuid.PcdFdBaseAddress|0|UINT64|0x0000002B
gArmTokenSpaceGuid.PcdFvBaseAddress|0|UINT64|0x0000002D