ArmVirtPkg/Library/FdtPciPcdProducerLib/FdtPciPcdProducerLib.c

   1 /** @file
   2   FDT client library for consumers of PCI related dynamic PCDs
   3
   4   Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
   5
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <Uefi.h>
  17
  18 #include <Library/BaseLib.h>
  19 #include <Library/DebugLib.h>
  20 #include <Library/PcdLib.h>
  21 #include <Library/UefiBootServicesTableLib.h>
  22
  23 #include <Protocol/FdtClient.h>
  24
  25 RETURN_STATUS
  26 EFIAPI
  27 FdtPciPcdProducerLibConstructor (
  28   VOID
  29   )
  30 {
  31   UINT64              PciExpressBaseAddress;
  32   FDT_CLIENT_PROTOCOL *FdtClient;
  33   CONST UINT64        *Reg;
  34   UINT32              RegElemSize, RegSize;
  35   EFI_STATUS          Status;
  36
  37   PciExpressBaseAddress = PcdGet64 (PcdPciExpressBaseAddress);
  38   if (PciExpressBaseAddress != MAX_UINT64) {
  39     return EFI_SUCCESS;
  40   }
  41
  42   Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
  43                   (VOID **)&FdtClient);
  44   ASSERT_EFI_ERROR (Status);
  45
  46   Status = FdtClient->FindCompatibleNodeReg (FdtClient,
  47                         "pci-host-ecam-generic", (CONST VOID **)&Reg,
  48                         &RegElemSize, &RegSize);
  49
  50   if (EFI_ERROR (Status)) {
  51     PciExpressBaseAddress = 0;
  52   } else {
  53     ASSERT (RegElemSize == sizeof (UINT64));
  54     PciExpressBaseAddress = SwapBytes64 (*Reg);
  55
  56     PcdSetBool (PcdPciDisableBusEnumeration, FALSE);
  57   }
  58
  59   PcdSet64 (PcdPciExpressBaseAddress, PciExpressBaseAddress);
  60
  61   return RETURN_SUCCESS;
  62 }