1 files changed, 109 insertions, 0 deletions
diff --git a/Platform/Intel/PurleyOpenBoardPkg/Pci/PciPlatform/PciSupportLib.c b/Platform/Intel/PurleyOpenBoardPkg/Pci/PciPlatform/PciSupportLib.c
new file mode 100644
index 0000000000..dbd744b9d2
--- /dev/null
+++ b/Platform/Intel/PurleyOpenBoardPkg/Pci/PciPlatform/PciSupportLib.c
@@ -0,0 +1,109 @@
+/** @file
+
+Copyright (c) 2018, 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 that accompanies this distribution.
+The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php.
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "PiDxe.h"
+#include <Base.h>
+#include <Guid/SocketIioVariable.h>
+#include <Library/IoLib.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include "IndustryStandard/Pci.h"
+#include "PciSupportLib.h"
+
+PCIE_STACK  mPcieStack;
+
+
+/**
+
+  This routine is used to check whether the pci device is present
+
+  @retval None
+
+**/
+BOOLEAN
+IsPciDevicePresent (
+  IN EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL  *PciRootBridgeIo,
+  PCI_TYPE00                          *Pci,
+  UINT8                               Bus,
+  UINT8                               Device,
+  UINT8                               Func
+  )
+// TODO:    PciRootBridgeIo - add argument and description to function comment
+// TODO:    Pci - add argument and description to function comment
+// TODO:    Bus - add argument and description to function comment
+// TODO:    Device - add argument and description to function comment
+// TODO:    Func - add argument and description to function comment
+// TODO:    EFI_SUCCESS - add return value to function comment
+// TODO:    EFI_NOT_FOUND - add return value to function comment
+{
+  UINT64      Address;
+  UINT32      Dummy;
+  EFI_STATUS  Status;
+  
+  Dummy=0xFFFFFFFF;
+  //
+  // Create PCI address map in terms of Bus, Device and Func
+  //
+  Address = EFI_PCI_ADDRESS (Bus, Device, Func, 0);
+
+  //
+  // Read the Vendor Id register
+  //
+  Status = PciRootBridgeIo->Pci.Read (
+                                  PciRootBridgeIo,
+                                  EfiPciWidthUint32,
+                                  Address,
+                                  1,
+                                  Pci
+                                  );
+  if ((Pci->Hdr).VendorId == 0xffff) {
+    /// PCIe card could have been assigned a temporary bus number. 
+    /// An write cycle can be used to try to rewrite the Bus number in the card
+    /// Try to write the Vendor Id register, and recheck if the card is present. 
+    Status = PciRootBridgeIo->Pci.Write(
+                                    PciRootBridgeIo, 
+                                    EfiPciWidthUint32, 
+                                    Address, 
+                                    1,							  
+                                    &Dummy
+                                    ); 
+									
+    // Retry the previous read after the PCI cycle has been tried. 
+    Status = PciRootBridgeIo->Pci.Read (
+                                    PciRootBridgeIo,
+                                    EfiPciWidthUint32,
+                                    Address,
+                                    1,
+                                    Pci
+                                    );
+  }
+
+  if (!EFI_ERROR (Status) && (Pci->Hdr).VendorId != 0xffff) {
+
+    //
+    // Read the entire config header for the device
+    //
+
+    Status = PciRootBridgeIo->Pci.Read (
+                                    PciRootBridgeIo,
+                                    EfiPciWidthUint32,
+                                    Address,
+                                    sizeof (PCI_TYPE00) / sizeof (UINT32),
+                                    Pci
+                                    );
+
+    return TRUE;
+  }
+
+  return FALSE;
+}