MdeModulePkg: Skip to manage usb debug port in EDKII EHCI driver if it's used by usb debug port driver

Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13226 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Bus/Pci/EhciDxe/EhciReg.c

@@ -2,7 +2,7 @@
 
   The EHCI register operation routines.
 
-Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2007 - 2012, 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
 which accompanies this distribution.  The full text of the license may be found at
@@ -53,6 +53,42 @@ EhcReadCapRegister (
   return Data;
 }
 
+/**
+  Read EHCI debug port register.
+
+  @param  Ehc          The EHCI device.
+  @param  Offset       Debug port register offset.
+
+  @return The register content read.
+  @retval If err, return 0xffff.
+
+**/
+UINT32
+EhcReadDbgRegister (
+  IN  USB2_HC_DEV         *Ehc,
+  IN  UINT32              Offset
+  )
+{
+  UINT32                  Data;
+  EFI_STATUS              Status;
+
+  Status = Ehc->PciIo->Mem.Read (
+                             Ehc->PciIo,
+                             EfiPciIoWidthUint32,
+                             Ehc->DebugPortBarNum,
+                             (UINT64) (Ehc->DebugPortOffset + Offset),
+                             1,
+                             &Data
+                             );
+
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_ERROR, "EhcReadDbgRegister: Pci Io read error - %r at %d\n", Status, Offset));
+    Data = 0xFFFF;
+  }
+
+  return Data;
+}
+
 
 /**
   Read EHCI Operation register.