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EmbeddedPkg/CoherentDmaLib: add support for non-1:1 DMA translation 

Bring CoherentDmaLib in line with ArmDmaLib, and add support for
defining a static offset between the host's and the bus master's
view of memory.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel 2017-08-30 08:02:15 +01:00
parent 7385d2543e
commit 0bcb801067
3 changed files with 19 additions and 1 deletions
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7
EmbeddedPkg/EmbeddedPkg.dec
View File

@ -205,3 +205,10 @@
[PcdsFixedAtBuild.common, PcdsDynamic.common] [PcdsFixedAtBuild.common, PcdsDynamic.common]
gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths|L""|VOID*|0x00000055 gEmbeddedTokenSpaceGuid.PcdFdtDevicePaths|L""|VOID*|0x00000055
#
# Value to add to a host address to obtain a device address, using
# unsigned 64-bit integer arithmetic. This means we can rely on
# truncation on overflow to specify negative offsets.
#
gEmbeddedTokenSpaceGuid.PcdDmaDeviceOffset|0x0|UINT64|0x0000058

10
EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.c
View File

@ -19,6 +19,14 @@
#include <Library/MemoryAllocationLib.h> #include <Library/MemoryAllocationLib.h>
STATIC
PHYSICAL_ADDRESS
HostToDeviceAddress (
IN VOID *Address
)
{
return (PHYSICAL_ADDRESS)(UINTN)Address + PcdGet64 (PcdDmaDeviceOffset);
}
/** /**
Provides the DMA controller-specific addresses needed to access system memory. Provides the DMA controller-specific addresses needed to access system memory.
@ -50,7 +58,7 @@ DmaMap (
OUT VOID **Mapping OUT VOID **Mapping
) )
{ {
*DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)HostAddress; *DeviceAddress = HostToDeviceAddress (HostAddress);
*Mapping = NULL; *Mapping = NULL;
return EFI_SUCCESS; return EFI_SUCCESS;
} }

3
EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.inf
View File

@ -31,3 +31,6 @@
[LibraryClasses] [LibraryClasses]
DebugLib DebugLib
MemoryAllocationLib MemoryAllocationLib
[Pcd]
gEmbeddedTokenSpaceGuid.PcdDmaDeviceOffset