From 0bcb80106762c65463b1eac4009a59980a65b351 Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Wed, 30 Aug 2017 08:02:15 +0100
Subject: 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>
---
 EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.c   | 10 +++++++++-
 EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.inf |  3 +++
 2 files changed, 12 insertions(+), 1 deletion(-)

(limited to 'EmbeddedPkg/Library/CoherentDmaLib')

diff --git a/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.c b/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.c
index 4cbe349..564db83 100644
--- a/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.c
+++ b/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.c
@@ -19,6 +19,14 @@
 #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.
@@ -50,7 +58,7 @@ DmaMap (
   OUT    VOID                           **Mapping
   )
 {
-  *DeviceAddress = (PHYSICAL_ADDRESS)(UINTN)HostAddress;
+  *DeviceAddress = HostToDeviceAddress (HostAddress);
   *Mapping = NULL;
   return EFI_SUCCESS;
 }
diff --git a/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.inf b/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.inf
index c40a600..f64d780 100644
--- a/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.inf
+++ b/EmbeddedPkg/Library/CoherentDmaLib/CoherentDmaLib.inf
@@ -31,3 +31,6 @@
 [LibraryClasses]
   DebugLib
   MemoryAllocationLib
+
+[Pcd]
+  gEmbeddedTokenSpaceGuid.PcdDmaDeviceOffset
-- 
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