[Patch][edk2-platforms/devel-MinnowBoard3 2/2] Restore P2SB MMIO

[zwei4 <david.wei@intel.com>]

Restore P2SB's, as well as GPIO controllers', MMIO resources to original values which have been overridden by PCI bus driver.

Signed-off-by: zwei4 <david.wei@intel.com>

Cc: Mike Wu <mike.wu@intel.com>
Cc: Benjamin You <benjamin.you@intel.com>
Cc: Mang Guo <mang.guo@intel.com>
Cc: Shifei Lu <shifeix.a.lu@intel.com>
Cc: Ruth Li <ruth.li@intel.com>
Cc: Junjie He <junjie.he@intel.com>
---
 .../BroxtonSoC/BroxtonSiPkg/SouthCluster/ScInit/Dxe/ScInit.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/ScInit/Dxe/ScInit.c b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/ScInit/Dxe/ScInit.c
index 6fb6c8df4..c4a9d5088 100644
--- a/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/ScInit/Dxe/ScInit.c
+++ b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/ScInit/Dxe/ScInit.c
@@ -1,7 +1,7 @@
 /** @file
   This is the driver that initializes the Intel SC devices
 
-  Copyright (c) 1999 - 2016, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 1999 - 2017, Intel Corporation. All rights reserved.<BR>
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -111,6 +111,16 @@ ScOnPciEnumComplete (
   gBS->CloseEvent (Event);
 
   //
+  // Restore P2SB and GPIO controlers's Base Address to original value which is overridden by PCI BUS driver.
+  // P2SB will be switched to ACPI mode at exit boot service, so it's resource must be allocated from ACPI_MMIO_BASE_ADDRESS 
+  // region, to avoid resource conflict with PCI resource used by PCI_HOST.asl. 
+  //
+  MmioWrite32 (
+    MmPciAddress (0, DEFAULT_PCI_BUS_NUMBER_SC, PCI_DEVICE_NUMBER_P2SB, PCI_FUNCTION_NUMBER_P2SB, R_P2SB_BASE),
+    (UINT32) ((PcdGet32 (PcdP2SBBaseAddress)))
+    );
+   
+  //
   // Get SC PMC fuction disable reset HOB.
   //
   HobPtr.Guid = GetFirstGuidHob (&gScPmcFunctionDisableResetHobGuid);
-- 
2.11.0.windows.1