[edk2,v4,2/4] Platforms/Juno: add PciHostBridgeLib implementation

Message ID 20170405140055.28937-3-ard.biesheuvel@linaro.org
State New
Headers show
Series
  • Juno cleanup -- OpenPlatformPkg edition
Related show

Commit Message

Ard Biesheuvel April 5, 2017, 2 p.m.
In order to be able to switch to the generic PCI host bridge driver,
implement the glue library that exposes the PCIe parameters to the
common driver. Since the Juno performs some initialization of the
PCIe control registers as well, copy that code from the old EDK2
driver into the library's constructor.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c   | 199 ++++++++++++++++++++
 Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf |  77 ++++++++
 Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c            | 182 ++++++++++++++++++
 Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h            | 107 +++++++++++
 4 files changed, 565 insertions(+)

-- 
2.9.3

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Comments

Leif Lindholm April 5, 2017, 3:02 p.m. | #1
On Wed, Apr 05, 2017 at 03:00:53PM +0100, Ard Biesheuvel wrote:
> In order to be able to switch to the generic PCI host bridge driver,

> implement the glue library that exposes the PCIe parameters to the

> common driver. Since the Juno performs some initialization of the

> PCIe control registers as well, copy that code from the old EDK2

> driver into the library's constructor.

> 

> Contributed-under: TianoCore Contribution Agreement 1.0

> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>


Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>


> ---

>  Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c   | 199 ++++++++++++++++++++

>  Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf |  77 ++++++++

>  Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c            | 182 ++++++++++++++++++

>  Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h            | 107 +++++++++++

>  4 files changed, 565 insertions(+)

> 

> diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c

> new file mode 100644

> index 000000000000..f5cb2544652b

> --- /dev/null

> +++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c

> @@ -0,0 +1,199 @@

> +/** @file

> +  PCI Host Bridge Library instance for ARM Juno

> +

> +  Copyright (c) 2017, Linaro Ltd. 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

> +  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 <Library/DebugLib.h>

> +#include <Library/DevicePathLib.h>

> +#include <Library/IoLib.h>

> +#include <Library/MemoryAllocationLib.h>

> +#include <Library/PcdLib.h>

> +#include <Library/PciHostBridgeLib.h>

> +

> +#include <Protocol/PciHostBridgeResourceAllocation.h>

> +#include <Protocol/PciRootBridgeIo.h>

> +

> +#include "ArmPlatform.h"

> +

> +#pragma pack(1)

> +typedef struct {

> +  ACPI_HID_DEVICE_PATH     AcpiDevicePath;

> +  EFI_DEVICE_PATH_PROTOCOL EndDevicePath;

> +} EFI_PCI_ROOT_BRIDGE_DEVICE_PATH;

> +#pragma pack ()

> +

> +STATIC EFI_PCI_ROOT_BRIDGE_DEVICE_PATH mEfiPciRootBridgeDevicePath = {

> +  {

> +    {

> +      ACPI_DEVICE_PATH,

> +      ACPI_DP,

> +      {

> +        (UINT8) (sizeof(ACPI_HID_DEVICE_PATH)),

> +        (UINT8) ((sizeof(ACPI_HID_DEVICE_PATH)) >> 8)

> +      }

> +    },

> +    EISA_PNP_ID(0x0A03), // PCI

> +    0

> +  }, {

> +    END_DEVICE_PATH_TYPE,

> +    END_ENTIRE_DEVICE_PATH_SUBTYPE,

> +    {

> +      END_DEVICE_PATH_LENGTH,

> +      0

> +    }

> +  }

> +};

> +

> +STATIC PCI_ROOT_BRIDGE mRootBridge = {

> +  0,                                              // Segment

> +  0,                                              // Supports

> +  0,                                              // Attributes

> +  TRUE,                                           // DmaAbove4G

> +  FALSE,                                          // NoExtendedConfigSpace

> +  FALSE,                                          // ResourceAssigned

> +  EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM |          // AllocationAttributes

> +  EFI_PCI_HOST_BRIDGE_MEM64_DECODE,

> +  {

> +    // Bus

> +    FixedPcdGet32 (PcdPciBusMin),

> +    FixedPcdGet32 (PcdPciBusMax)

> +  }, {

> +    // Io

> +    FixedPcdGet64 (PcdPciIoBase),

> +    FixedPcdGet64 (PcdPciIoBase) + FixedPcdGet64 (PcdPciIoSize) - 1

> +  }, {

> +    // Mem

> +    FixedPcdGet32 (PcdPciMmio32Base),

> +    FixedPcdGet32 (PcdPciMmio32Base) + FixedPcdGet32 (PcdPciMmio32Size) - 1

> +  }, {

> +    // MemAbove4G

> +    FixedPcdGet64 (PcdPciMmio64Base),

> +    FixedPcdGet64 (PcdPciMmio64Base) + FixedPcdGet64 (PcdPciMmio64Size) - 1

> +  }, {

> +    // PMem

> +    MAX_UINT64,

> +    0

> +  }, {

> +    // PMemAbove4G

> +    MAX_UINT64,

> +    0

> +  },

> +  (EFI_DEVICE_PATH_PROTOCOL *)&mEfiPciRootBridgeDevicePath

> +};

> +

> +/**

> +  Return all the root bridge instances in an array.

> +

> +  @param Count  Return the count of root bridge instances.

> +

> +  @return All the root bridge instances in an array.

> +          The array should be passed into PciHostBridgeFreeRootBridges()

> +          when it's not used.

> +**/

> +PCI_ROOT_BRIDGE *

> +EFIAPI

> +PciHostBridgeGetRootBridges (

> +  UINTN *Count

> +  )

> +{

> +  UINT32                  JunoRevision;

> +

> +  //

> +  // Juno R0 has no working PCIe

> +  //

> +  GetJunoRevision (JunoRevision);

> +  if (JunoRevision < JUNO_REVISION_R1) {

> +    *Count = 0;

> +    return NULL;

> +  }

> +

> +  *Count = 1;

> +

> +  return &mRootBridge;

> +}

> +

> +/**

> +  Free the root bridge instances array returned from PciHostBridgeGetRootBridges().

> +

> +  @param Bridges The root bridge instances array.

> +  @param Count   The count of the array.

> +**/

> +VOID

> +EFIAPI

> +PciHostBridgeFreeRootBridges (

> +  PCI_ROOT_BRIDGE *Bridges,

> +  UINTN           Count

> +  )

> +{

> +}

> +

> +

> +STATIC CONST CHAR16 mPciHostBridgeLibAcpiAddressSpaceTypeStr[][4] = {

> +  L"Mem", L"I/O", L"Bus"

> +};

> +

> +/**

> +  Inform the platform that the resource conflict happens.

> +

> +  @param HostBridgeHandle Handle of the Host Bridge.

> +  @param Configuration    Pointer to PCI I/O and PCI memory resource

> +                          descriptors. The Configuration contains the resources

> +                          for all the root bridges. The resource for each root

> +                          bridge is terminated with END descriptor and an

> +                          additional END is appended indicating the end of the

> +                          entire resources. The resource descriptor field

> +                          values follow the description in

> +                          EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL

> +                          .SubmitResources().

> +**/

> +VOID

> +EFIAPI

> +PciHostBridgeResourceConflict (

> +  EFI_HANDLE                        HostBridgeHandle,

> +  VOID                              *Configuration

> +  )

> +{

> +  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;

> +  UINTN                             RootBridgeIndex;

> +  DEBUG ((EFI_D_ERROR, "PciHostBridge: Resource conflict happens!\n"));

> +

> +  RootBridgeIndex = 0;

> +  Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;

> +  while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {

> +    DEBUG ((EFI_D_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));

> +    for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {

> +      ASSERT (Descriptor->ResType <

> +              ARRAY_SIZE (mPciHostBridgeLibAcpiAddressSpaceTypeStr)

> +              );

> +      DEBUG ((EFI_D_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",

> +              mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],

> +              Descriptor->AddrLen, Descriptor->AddrRangeMax

> +              ));

> +      if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {

> +        DEBUG ((EFI_D_ERROR, "     Granularity/SpecificFlag = %ld / %02x%s\n",

> +                Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,

> +                ((Descriptor->SpecificFlag &

> +                  EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE

> +                  ) != 0) ? L" (Prefetchable)" : L""

> +                ));

> +      }

> +    }

> +    //

> +    // Skip the END descriptor for root bridge

> +    //

> +    ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);

> +    Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(

> +                   (EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1

> +                   );

> +  }

> +}

> diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf

> new file mode 100644

> index 000000000000..68e22396ccef

> --- /dev/null

> +++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf

> @@ -0,0 +1,77 @@

> +## @file

> +#  PCI Host Bridge Library instance for ARM Juno

> +#

> +#  Copyright (c) 2017, Linaro Ltd. 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

> +#  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.

> +#

> +#

> +##

> +

> +[Defines]

> +  INF_VERSION                    = 0x00010005

> +  BASE_NAME                      = JunoPciHostBridgeLib

> +  FILE_GUID                      = d92c722c-87f9-4988-843e-dffd6bc8c5e3

> +  MODULE_TYPE                    = DXE_DRIVER

> +  VERSION_STRING                 = 1.0

> +  LIBRARY_CLASS                  = PciHostBridgeLib|DXE_DRIVER

> +  CONSTRUCTOR                    = HWPciRbInit

> +

> +#

> +# The following information is for reference only and not required by the build

> +# tools.

> +#

> +#  VALID_ARCHITECTURES           = AARCH64 ARM

> +#

> +

> +[Sources]

> +  JunoPciHostBridgeLib.c

> +  XPressRich3.c

> +

> +[Packages]

> +  ArmPlatformPkg/ArmJunoPkg/ArmJuno.dec

> +  ArmPkg/ArmPkg.dec

> +  MdeModulePkg/MdeModulePkg.dec

> +  MdePkg/MdePkg.dec

> +

> +[LibraryClasses]

> +  BaseLib

> +  DebugLib

> +  DevicePathLib

> +  IoLib

> +  MemoryAllocationLib

> +  UefiBootServicesTableLib

> +

> +[Pcd]

> +  gArmTokenSpaceGuid.PcdSystemMemoryBase

> +  gArmTokenSpaceGuid.PcdSystemMemorySize

> +

> +[FixedPcd]

> +  gArmTokenSpaceGuid.PcdPciBusMin

> +  gArmTokenSpaceGuid.PcdPciBusMax

> +  gArmTokenSpaceGuid.PcdPciIoBase

> +  gArmTokenSpaceGuid.PcdPciIoSize

> +  gArmTokenSpaceGuid.PcdPciIoTranslation

> +  gArmTokenSpaceGuid.PcdPciMmio32Base

> +  gArmTokenSpaceGuid.PcdPciMmio32Size

> +  gArmTokenSpaceGuid.PcdPciMmio32Translation

> +  gArmTokenSpaceGuid.PcdPciMmio64Base

> +  gArmTokenSpaceGuid.PcdPciMmio64Size

> +  gArmTokenSpaceGuid.PcdPciMmio64Translation

> +

> +  gArmJunoTokenSpaceGuid.PcdPcieControlBaseAddress

> +  gArmJunoTokenSpaceGuid.PcdPcieRootPortBaseAddress

> +  gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceBaseAddress

> +  gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceSize

> +

> +[Protocols]

> +  gEfiCpuIo2ProtocolGuid          ## CONSUMES

> +

> +[Depex]

> +  gEfiCpuIo2ProtocolGuid

> diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c

> new file mode 100644

> index 000000000000..a6d782949e22

> --- /dev/null

> +++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c

> @@ -0,0 +1,182 @@

> +/** @file

> +*  Initialize the XPress-RICH3 PCIe Root complex

> +*

> +*  Copyright (c) 2011-2015, ARM Ltd. All rights reserved.

> +*  Copyright (c) 2017, Linaro, Ltd. All rights reserved.

> +*

> +*  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

> +*  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 <Library/BaseLib.h>

> +#include <Library/DebugLib.h>

> +#include <Library/IoLib.h>

> +#include <Library/UefiBootServicesTableLib.h>

> +

> +#include <IndustryStandard/Pci22.h>

> +

> +#include "XPressRich3.h"

> +#include "ArmPlatform.h"

> +

> +#define PCI_BRIDGE_REVISION_ID                        1

> +#define CLASS_CODE_REGISTER(Class, SubClass, ProgIf)  ((Class << 16) | (SubClass << 8) | ProgIf)

> +#define PLDA_BRIDGE_CCR                               CLASS_CODE_REGISTER(PCI_CLASS_BRIDGE, \

> +                                                                          PCI_CLASS_BRIDGE_P2P, \

> +                                                                          PCI_IF_BRIDGE_P2P)

> +

> +STATIC

> +VOID

> +SetTranslationAddressEntry (

> +  IN  EFI_CPU_IO2_PROTOCOL    *CpuIo,

> +  IN  UINTN                   Entry,

> +  IN  UINT64                  SourceAddress,

> +  IN  UINT64                  TranslatedAddress,

> +  IN  UINT64                  TranslationSize,

> +  IN  UINT64                  TranslationParameter

> +  )

> +{

> +  UINTN Log2Size = HighBitSet64 (TranslationSize);

> +

> +  // Ensure the size is a power of two. Restriction form the AXI Translation logic

> +  // Othwerwise we increase the translation size

> +  if (TranslationSize != (1ULL << Log2Size)) {

> +    DEBUG ((EFI_D_WARN, "PCI: The size 0x%lX of the region 0x%lx has been increased to "

> +                        "be a power of two for the AXI translation table.\n",

> +                        TranslationSize, SourceAddress));

> +    Log2Size++;

> +  }

> +

> +  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_SRC_ADDR_LOW_SIZE,

> +      (UINT32)SourceAddress | ((Log2Size - 1) << 1) | 0x1);

> +  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_SRC_ADDR_HI, SourceAddress >> 32);

> +

> +  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_TRSL_ADDR_LOW, (UINT32)TranslatedAddress);

> +  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_TRSL_ADDR_HI, TranslatedAddress >> 32);

> +

> +  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_TRSL_PARAM, TranslationParameter);

> +}

> +

> +EFI_STATUS

> +HWPciRbInit (

> +  IN EFI_HANDLE        ImageHandle,

> +  IN EFI_SYSTEM_TABLE  *SystemTable

> +  )

> +{

> +  UINT32                  Value;

> +  UINT32                  Index;

> +  UINTN                   TranslationTable;

> +  EFI_CPU_IO2_PROTOCOL    *CpuIo;

> +  EFI_STATUS              Status;

> +

> +  PCI_TRACE ("VExpressPciRbInit()");

> +

> +  PCI_TRACE ("PCIe Setting up Address Translation");

> +

> +  Status = gBS->LocateProtocol (&gEfiCpuIo2ProtocolGuid, NULL,

> +                  (VOID **)&CpuIo);

> +  ASSERT_EFI_ERROR (Status);

> +

> +  // The Juno PIO window is 8M, so we need full 32-bit PIO decoding.

> +  PCIE_ROOTPORT_WRITE32 (PCIE_BAR_WIN, PCIE_BAR_WIN_SUPPORT_IO | PCIE_BAR_WIN_SUPPORT_IO32 |

> +                         PCIE_BAR_WIN_SUPPORT_MEM | PCIE_BAR_WIN_SUPPORT_MEM64);

> +

> +  // Setup the PCI Configuration Registers

> +  // Offset 0a: SubClass       04 PCI-PCI Bridge

> +  // Offset 0b: BaseClass      06 Bridge Device

> +  // The Class Code register is a 24 bit and can be configured by setting up the PCIE_PCI_IDS

> +  // Refer [1] Chapter 13

> +  PCIE_ROOTPORT_WRITE32 (PCIE_PCI_IDS + PCIE_PCI_IDS_CLASSCODE_OFFSET, ((PLDA_BRIDGE_CCR << 8) | PCI_BRIDGE_REVISION_ID));

> +

> +  //

> +  // PCIE Window 0 -> AXI4 Master 0 Address Translations

> +  //

> +  TranslationTable = VEXPRESS_ATR_PCIE_WIN0;

> +

> +  // MSI Support

> +  SetTranslationAddressEntry (CpuIo, TranslationTable, ARM_JUNO_GIV2M_MSI_BASE, ARM_JUNO_GIV2M_MSI_BASE,

> +      ARM_JUNO_GIV2M_MSI_SZ, PCI_ATR_TRSLID_AXIDEVICE);

> +  TranslationTable += PCI_ATR_ENTRY_SIZE;

> +

> +  // System Memory Support

> +  SetTranslationAddressEntry (CpuIo, TranslationTable, PcdGet64 (PcdSystemMemoryBase), PcdGet64 (PcdSystemMemoryBase),

> +      PcdGet64 (PcdSystemMemorySize), PCI_ATR_TRSLID_AXIMEMORY);

> +  TranslationTable += PCI_ATR_ENTRY_SIZE;

> +  SetTranslationAddressEntry (CpuIo, TranslationTable, ARM_JUNO_EXTRA_SYSTEM_MEMORY_BASE, ARM_JUNO_EXTRA_SYSTEM_MEMORY_BASE,

> +      ARM_JUNO_EXTRA_SYSTEM_MEMORY_SZ, PCI_ATR_TRSLID_AXIMEMORY);

> +

> +  //

> +  // AXI4 Slave 1 -> PCIE Window 0 Address Translations

> +  //

> +  TranslationTable = VEXPRESS_ATR_AXI4_SLV1;

> +

> +  // PCI ECAM Support

> +  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_ECAM_BASE, PCI_ECAM_BASE, PCI_ECAM_SIZE, PCI_ATR_TRSLID_PCIE_CONF);

> +  TranslationTable += PCI_ATR_ENTRY_SIZE;

> +

> +  // PCI IO Support, the PIO space is translated from the arm MMIO PCI_IO_BASE address to the PIO base address of 0

> +  // AKA, PIO addresses used by endpoints are generally in the range of 0-64K.

> +  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_IO_BASE, 0, PCI_IO_SIZE, PCI_ATR_TRSLID_PCIE_IO);

> +  TranslationTable += PCI_ATR_ENTRY_SIZE;

> +

> +  // PCI MEM32 Support

> +  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_MEM32_BASE, PCI_MEM32_BASE, PCI_MEM32_SIZE, PCI_ATR_TRSLID_PCIE_MEMORY);

> +  TranslationTable += PCI_ATR_ENTRY_SIZE;

> +

> +  // PCI MEM64 Support

> +  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_MEM64_BASE, PCI_MEM64_BASE, PCI_MEM64_SIZE, PCI_ATR_TRSLID_PCIE_MEMORY);

> +

> +  // Add credits

> +  PCIE_ROOTPORT_WRITE32 (PCIE_VC_CRED, 0x00f0b818);

> +  PCIE_ROOTPORT_WRITE32 (PCIE_VC_CRED + 4, 0x1);

> +

> +  // Allow ECRC

> +  PCIE_ROOTPORT_WRITE32 (PCIE_PEX_SPC2, 0x6006);

> +

> +  // Reset controller

> +  PCIE_CONTROL_WRITE32 (PCIE_CONTROL_RST_CTL, PCIE_CONTROL_RST_CTL_RCPHY_REL);

> +

> +  // Wait for reset

> +  for (Index = 0; Index < 1000; Index++) {

> +    gBS->Stall (1000);

> +    PCIE_CONTROL_READ32 (PCIE_CONTROL_RST_STS, Value);

> +    if ((Value & PCIE_CONTROL_RST_STS_RCPHYPLL_OUT) == PCIE_CONTROL_RST_STS_RCPHYPLL_OUT) {

> +      break;

> +    }

> +  }

> +

> +  // Check for reset

> +  if (!(Value & PCIE_CONTROL_RST_STS_RCPHYPLL_OUT)) {

> +    DEBUG ((EFI_D_ERROR, "PCIe failed to come out of reset: %x.\n", Value));

> +    return EFI_NOT_READY;

> +  }

> +

> +  gBS->Stall (1000);

> +  PCI_TRACE ("Checking link Status...");

> +

> +  // Wait for Link Up

> +  for (Index = 0; Index < 1000; Index++) {

> +    gBS->Stall (1000);

> +    PCIE_ROOTPORT_READ32 (VEXPRESS_BASIC_STATUS, Value);

> +    if (Value & LINK_UP) {

> +      break;

> +    }

> +  }

> +

> +  // Check for link up

> +  if (!(Value & LINK_UP)) {

> +    DEBUG ((EFI_D_ERROR, "PCIe link not up: %x.\n", Value));

> +    return EFI_NOT_READY;

> +  }

> +

> +  PCIE_ROOTPORT_WRITE32 (PCIE_IMASK_LOCAL, PCIE_INT_MSI | PCIE_INT_INTx);

> +

> +  return EFI_SUCCESS;

> +}

> diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h

> new file mode 100644

> index 000000000000..07f52c210ed9

> --- /dev/null

> +++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h

> @@ -0,0 +1,107 @@

> +/** @file

> +*  Header containing the Xpress-RICH3 PCIe Root Complex specific values

> +*

> +*  Copyright (c) 2011-2015, ARM Ltd. All rights reserved.

> +*

> +*  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

> +*  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.

> +*

> +**/

> +

> +#ifndef __XPRESS_RICH3_H__

> +#define __XPRESS_RICH3_H__

> +

> +#include <Protocol/CpuIo2.h>

> +#include <Library/PcdLib.h>

> +

> +#define PCI_ECAM_BASE       FixedPcdGet64 (PcdPciConfigurationSpaceBaseAddress)

> +#define PCI_ECAM_SIZE       FixedPcdGet64 (PcdPciConfigurationSpaceSize)

> +#define PCI_IO_BASE         FixedPcdGet64 (PcdPciIoTranslation)

> +#define PCI_IO_SIZE         FixedPcdGet64 (PcdPciIoSize)

> +#define PCI_MEM32_BASE      FixedPcdGet64 (PcdPciMmio32Base)

> +#define PCI_MEM32_SIZE      FixedPcdGet64 (PcdPciMmio32Size)

> +#define PCI_MEM64_BASE      FixedPcdGet64 (PcdPciMmio64Base)

> +#define PCI_MEM64_SIZE      FixedPcdGet64 (PcdPciMmio64Size)

> +

> +#define PCI_TRACE(txt)  DEBUG((EFI_D_VERBOSE, "ARM_PCI: " txt "\n"))

> +

> +#define PCIE_ROOTPORT_WRITE32(Add, Val) { UINT32 Value = (UINT32)(Val); CpuIo->Mem.Write (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieRootPortBaseAddress)+(Add)),1,&Value); }

> +#define PCIE_ROOTPORT_READ32(Add, Val) { CpuIo->Mem.Read (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieRootPortBaseAddress)+(Add)),1,&Val); }

> +

> +#define PCIE_CONTROL_WRITE32(Add, Val) { UINT32 Value = (UINT32)(Val); CpuIo->Mem.Write (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieControlBaseAddress)+(Add)),1,&Value); }

> +#define PCIE_CONTROL_READ32(Add, Val) { CpuIo->Mem.Read (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieControlBaseAddress)+(Add)),1,&Val); }

> +

> +/*

> + * Bridge Internal Registers

> + */

> +

> +// PCIe Available Credit Settings

> +#define PCIE_VC_CRED                            0x090

> +// PCIe PCI Standard Configuration Identification Settings registers

> +#define PCIE_PCI_IDS                            0x098

> +#define PCIE_PCI_IDS_CLASSCODE_OFFSET           0x4

> +// PCIe Specific 2 Capabilities Settings

> +#define PCIE_PEX_SPC2                           0x0d8

> +// PCIe Windows Settings register

> +#define PCIE_BAR_WIN                            0x0FC

> +// Local Processor Interrupt Mask

> +#define PCIE_IMASK_LOCAL                        0x180

> +

> +#define PCIE_BAR_WIN_SUPPORT_IO                 BIT0

> +#define PCIE_BAR_WIN_SUPPORT_IO32               BIT1

> +#define PCIE_BAR_WIN_SUPPORT_MEM                BIT2

> +#define PCIE_BAR_WIN_SUPPORT_MEM64              BIT3

> +

> +#define PCIE_INT_MSI                            BIT28

> +#define PCIE_INT_A                              BIT24

> +#define PCIE_INT_B                              BIT25

> +#define PCIE_INT_C                              BIT26

> +#define PCIE_INT_D                              BIT27

> +#define PCIE_INT_INTx                           (PCIE_INT_A | PCIE_INT_B |\

> +                                                 PCIE_INT_C | PCIE_INT_D)

> +

> +/*

> + * PCIe Control Registers

> + */

> +#define PCIE_CONTROL_RST_CTL     0x1004

> +#define PCIE_CONTROL_RST_STS     0x1008

> +

> +/*

> + * PCI Express Address Translation registers

> + * All are offsets from PcdPcieControlBaseAddress

> + */

> +#define VEXPRESS_ATR_PCIE_WIN0    0x600

> +#define VEXPRESS_ATR_AXI4_SLV0    0x800

> +#define VEXPRESS_ATR_AXI4_SLV1    0x820

> +

> +#define PCI_ATR_ENTRY_SIZE           0x20

> +#define PCI_ATR_SRC_ADDR_LOW_SIZE    0

> +#define PCI_ATR_SRC_ADDR_HI          0x4

> +#define PCI_ATR_TRSL_ADDR_LOW        0x8

> +#define PCI_ATR_TRSL_ADDR_HI         0xc

> +#define PCI_ATR_TRSL_PARAM           0x10

> +

> +#define PCI_ATR_TRSLID_AXIDEVICE     0x420004

> +#define PCI_ATR_TRSLID_AXIMEMORY     0x4e0004

> +#define PCI_ATR_TRSLID_PCIE_CONF     0x000001

> +#define PCI_ATR_TRSLID_PCIE_IO       0x020000

> +#define PCI_ATR_TRSLID_PCIE_MEMORY   0x000000

> +

> +#define PCIE_CONTROL_RST_CTL_RC_REL        (1 << 1)

> +#define PCIE_CONTROL_RST_CTL_PHY_REL       (1 << 0)

> +#define PCIE_CONTROL_RST_CTL_RCPHY_REL     (PCIE_CONTROL_RST_CTL_RC_REL | PCIE_CONTROL_RST_CTL_PHY_REL)

> +

> +#define PCIE_CONTROL_RST_STS_RC_ST         (1 << 2)

> +#define PCIE_CONTROL_RST_STS_PHY_ST        (1 << 1)

> +#define PCIE_CONTROL_RST_STS_PLL_ST        (1 << 0)

> +#define PCIE_CONTROL_RST_STS_RCPHYPLL_OUT  (PCIE_CONTROL_RST_STS_RC_ST | PCIE_CONTROL_RST_STS_PHY_ST | PCIE_CONTROL_RST_STS_PLL_ST)

> +

> +#define VEXPRESS_BASIC_STATUS       0x18

> +#define LINK_UP                     0xff

> +

> +#endif

> -- 

> 2.9.3

> 

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diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c
new file mode 100644
index 000000000000..f5cb2544652b
--- /dev/null
+++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.c
@@ -0,0 +1,199 @@ 
+/** @file
+  PCI Host Bridge Library instance for ARM Juno
+
+  Copyright (c) 2017, Linaro Ltd. 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
+  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 <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/IoLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PciHostBridgeLib.h>
+
+#include <Protocol/PciHostBridgeResourceAllocation.h>
+#include <Protocol/PciRootBridgeIo.h>
+
+#include "ArmPlatform.h"
+
+#pragma pack(1)
+typedef struct {
+  ACPI_HID_DEVICE_PATH     AcpiDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL EndDevicePath;
+} EFI_PCI_ROOT_BRIDGE_DEVICE_PATH;
+#pragma pack ()
+
+STATIC EFI_PCI_ROOT_BRIDGE_DEVICE_PATH mEfiPciRootBridgeDevicePath = {
+  {
+    {
+      ACPI_DEVICE_PATH,
+      ACPI_DP,
+      {
+        (UINT8) (sizeof(ACPI_HID_DEVICE_PATH)),
+        (UINT8) ((sizeof(ACPI_HID_DEVICE_PATH)) >> 8)
+      }
+    },
+    EISA_PNP_ID(0x0A03), // PCI
+    0
+  }, {
+    END_DEVICE_PATH_TYPE,
+    END_ENTIRE_DEVICE_PATH_SUBTYPE,
+    {
+      END_DEVICE_PATH_LENGTH,
+      0
+    }
+  }
+};
+
+STATIC PCI_ROOT_BRIDGE mRootBridge = {
+  0,                                              // Segment
+  0,                                              // Supports
+  0,                                              // Attributes
+  TRUE,                                           // DmaAbove4G
+  FALSE,                                          // NoExtendedConfigSpace
+  FALSE,                                          // ResourceAssigned
+  EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM |          // AllocationAttributes
+  EFI_PCI_HOST_BRIDGE_MEM64_DECODE,
+  {
+    // Bus
+    FixedPcdGet32 (PcdPciBusMin),
+    FixedPcdGet32 (PcdPciBusMax)
+  }, {
+    // Io
+    FixedPcdGet64 (PcdPciIoBase),
+    FixedPcdGet64 (PcdPciIoBase) + FixedPcdGet64 (PcdPciIoSize) - 1
+  }, {
+    // Mem
+    FixedPcdGet32 (PcdPciMmio32Base),
+    FixedPcdGet32 (PcdPciMmio32Base) + FixedPcdGet32 (PcdPciMmio32Size) - 1
+  }, {
+    // MemAbove4G
+    FixedPcdGet64 (PcdPciMmio64Base),
+    FixedPcdGet64 (PcdPciMmio64Base) + FixedPcdGet64 (PcdPciMmio64Size) - 1
+  }, {
+    // PMem
+    MAX_UINT64,
+    0
+  }, {
+    // PMemAbove4G
+    MAX_UINT64,
+    0
+  },
+  (EFI_DEVICE_PATH_PROTOCOL *)&mEfiPciRootBridgeDevicePath
+};
+
+/**
+  Return all the root bridge instances in an array.
+
+  @param Count  Return the count of root bridge instances.
+
+  @return All the root bridge instances in an array.
+          The array should be passed into PciHostBridgeFreeRootBridges()
+          when it's not used.
+**/
+PCI_ROOT_BRIDGE *
+EFIAPI
+PciHostBridgeGetRootBridges (
+  UINTN *Count
+  )
+{
+  UINT32                  JunoRevision;
+
+  //
+  // Juno R0 has no working PCIe
+  //
+  GetJunoRevision (JunoRevision);
+  if (JunoRevision < JUNO_REVISION_R1) {
+    *Count = 0;
+    return NULL;
+  }
+
+  *Count = 1;
+
+  return &mRootBridge;
+}
+
+/**
+  Free the root bridge instances array returned from PciHostBridgeGetRootBridges().
+
+  @param Bridges The root bridge instances array.
+  @param Count   The count of the array.
+**/
+VOID
+EFIAPI
+PciHostBridgeFreeRootBridges (
+  PCI_ROOT_BRIDGE *Bridges,
+  UINTN           Count
+  )
+{
+}
+
+
+STATIC CONST CHAR16 mPciHostBridgeLibAcpiAddressSpaceTypeStr[][4] = {
+  L"Mem", L"I/O", L"Bus"
+};
+
+/**
+  Inform the platform that the resource conflict happens.
+
+  @param HostBridgeHandle Handle of the Host Bridge.
+  @param Configuration    Pointer to PCI I/O and PCI memory resource
+                          descriptors. The Configuration contains the resources
+                          for all the root bridges. The resource for each root
+                          bridge is terminated with END descriptor and an
+                          additional END is appended indicating the end of the
+                          entire resources. The resource descriptor field
+                          values follow the description in
+                          EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
+                          .SubmitResources().
+**/
+VOID
+EFIAPI
+PciHostBridgeResourceConflict (
+  EFI_HANDLE                        HostBridgeHandle,
+  VOID                              *Configuration
+  )
+{
+  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
+  UINTN                             RootBridgeIndex;
+  DEBUG ((EFI_D_ERROR, "PciHostBridge: Resource conflict happens!\n"));
+
+  RootBridgeIndex = 0;
+  Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
+  while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
+    DEBUG ((EFI_D_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
+    for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
+      ASSERT (Descriptor->ResType <
+              ARRAY_SIZE (mPciHostBridgeLibAcpiAddressSpaceTypeStr)
+              );
+      DEBUG ((EFI_D_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",
+              mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],
+              Descriptor->AddrLen, Descriptor->AddrRangeMax
+              ));
+      if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
+        DEBUG ((EFI_D_ERROR, "     Granularity/SpecificFlag = %ld / %02x%s\n",
+                Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,
+                ((Descriptor->SpecificFlag &
+                  EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE
+                  ) != 0) ? L" (Prefetchable)" : L""
+                ));
+      }
+    }
+    //
+    // Skip the END descriptor for root bridge
+    //
+    ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);
+    Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(
+                   (EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1
+                   );
+  }
+}
diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf
new file mode 100644
index 000000000000..68e22396ccef
--- /dev/null
+++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/JunoPciHostBridgeLib.inf
@@ -0,0 +1,77 @@ 
+## @file
+#  PCI Host Bridge Library instance for ARM Juno
+#
+#  Copyright (c) 2017, Linaro Ltd. 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
+#  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.
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = JunoPciHostBridgeLib
+  FILE_GUID                      = d92c722c-87f9-4988-843e-dffd6bc8c5e3
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PciHostBridgeLib|DXE_DRIVER
+  CONSTRUCTOR                    = HWPciRbInit
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = AARCH64 ARM
+#
+
+[Sources]
+  JunoPciHostBridgeLib.c
+  XPressRich3.c
+
+[Packages]
+  ArmPlatformPkg/ArmJunoPkg/ArmJuno.dec
+  ArmPkg/ArmPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  DevicePathLib
+  IoLib
+  MemoryAllocationLib
+  UefiBootServicesTableLib
+
+[Pcd]
+  gArmTokenSpaceGuid.PcdSystemMemoryBase
+  gArmTokenSpaceGuid.PcdSystemMemorySize
+
+[FixedPcd]
+  gArmTokenSpaceGuid.PcdPciBusMin
+  gArmTokenSpaceGuid.PcdPciBusMax
+  gArmTokenSpaceGuid.PcdPciIoBase
+  gArmTokenSpaceGuid.PcdPciIoSize
+  gArmTokenSpaceGuid.PcdPciIoTranslation
+  gArmTokenSpaceGuid.PcdPciMmio32Base
+  gArmTokenSpaceGuid.PcdPciMmio32Size
+  gArmTokenSpaceGuid.PcdPciMmio32Translation
+  gArmTokenSpaceGuid.PcdPciMmio64Base
+  gArmTokenSpaceGuid.PcdPciMmio64Size
+  gArmTokenSpaceGuid.PcdPciMmio64Translation
+
+  gArmJunoTokenSpaceGuid.PcdPcieControlBaseAddress
+  gArmJunoTokenSpaceGuid.PcdPcieRootPortBaseAddress
+  gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceBaseAddress
+  gArmJunoTokenSpaceGuid.PcdPciConfigurationSpaceSize
+
+[Protocols]
+  gEfiCpuIo2ProtocolGuid          ## CONSUMES
+
+[Depex]
+  gEfiCpuIo2ProtocolGuid
diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c
new file mode 100644
index 000000000000..a6d782949e22
--- /dev/null
+++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.c
@@ -0,0 +1,182 @@ 
+/** @file
+*  Initialize the XPress-RICH3 PCIe Root complex
+*
+*  Copyright (c) 2011-2015, ARM Ltd. All rights reserved.
+*  Copyright (c) 2017, Linaro, Ltd. All rights reserved.
+*
+*  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
+*  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 <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+#include <IndustryStandard/Pci22.h>
+
+#include "XPressRich3.h"
+#include "ArmPlatform.h"
+
+#define PCI_BRIDGE_REVISION_ID                        1
+#define CLASS_CODE_REGISTER(Class, SubClass, ProgIf)  ((Class << 16) | (SubClass << 8) | ProgIf)
+#define PLDA_BRIDGE_CCR                               CLASS_CODE_REGISTER(PCI_CLASS_BRIDGE, \
+                                                                          PCI_CLASS_BRIDGE_P2P, \
+                                                                          PCI_IF_BRIDGE_P2P)
+
+STATIC
+VOID
+SetTranslationAddressEntry (
+  IN  EFI_CPU_IO2_PROTOCOL    *CpuIo,
+  IN  UINTN                   Entry,
+  IN  UINT64                  SourceAddress,
+  IN  UINT64                  TranslatedAddress,
+  IN  UINT64                  TranslationSize,
+  IN  UINT64                  TranslationParameter
+  )
+{
+  UINTN Log2Size = HighBitSet64 (TranslationSize);
+
+  // Ensure the size is a power of two. Restriction form the AXI Translation logic
+  // Othwerwise we increase the translation size
+  if (TranslationSize != (1ULL << Log2Size)) {
+    DEBUG ((EFI_D_WARN, "PCI: The size 0x%lX of the region 0x%lx has been increased to "
+                        "be a power of two for the AXI translation table.\n",
+                        TranslationSize, SourceAddress));
+    Log2Size++;
+  }
+
+  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_SRC_ADDR_LOW_SIZE,
+      (UINT32)SourceAddress | ((Log2Size - 1) << 1) | 0x1);
+  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_SRC_ADDR_HI, SourceAddress >> 32);
+
+  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_TRSL_ADDR_LOW, (UINT32)TranslatedAddress);
+  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_TRSL_ADDR_HI, TranslatedAddress >> 32);
+
+  PCIE_ROOTPORT_WRITE32 (Entry + PCI_ATR_TRSL_PARAM, TranslationParameter);
+}
+
+EFI_STATUS
+HWPciRbInit (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  UINT32                  Value;
+  UINT32                  Index;
+  UINTN                   TranslationTable;
+  EFI_CPU_IO2_PROTOCOL    *CpuIo;
+  EFI_STATUS              Status;
+
+  PCI_TRACE ("VExpressPciRbInit()");
+
+  PCI_TRACE ("PCIe Setting up Address Translation");
+
+  Status = gBS->LocateProtocol (&gEfiCpuIo2ProtocolGuid, NULL,
+                  (VOID **)&CpuIo);
+  ASSERT_EFI_ERROR (Status);
+
+  // The Juno PIO window is 8M, so we need full 32-bit PIO decoding.
+  PCIE_ROOTPORT_WRITE32 (PCIE_BAR_WIN, PCIE_BAR_WIN_SUPPORT_IO | PCIE_BAR_WIN_SUPPORT_IO32 |
+                         PCIE_BAR_WIN_SUPPORT_MEM | PCIE_BAR_WIN_SUPPORT_MEM64);
+
+  // Setup the PCI Configuration Registers
+  // Offset 0a: SubClass       04 PCI-PCI Bridge
+  // Offset 0b: BaseClass      06 Bridge Device
+  // The Class Code register is a 24 bit and can be configured by setting up the PCIE_PCI_IDS
+  // Refer [1] Chapter 13
+  PCIE_ROOTPORT_WRITE32 (PCIE_PCI_IDS + PCIE_PCI_IDS_CLASSCODE_OFFSET, ((PLDA_BRIDGE_CCR << 8) | PCI_BRIDGE_REVISION_ID));
+
+  //
+  // PCIE Window 0 -> AXI4 Master 0 Address Translations
+  //
+  TranslationTable = VEXPRESS_ATR_PCIE_WIN0;
+
+  // MSI Support
+  SetTranslationAddressEntry (CpuIo, TranslationTable, ARM_JUNO_GIV2M_MSI_BASE, ARM_JUNO_GIV2M_MSI_BASE,
+      ARM_JUNO_GIV2M_MSI_SZ, PCI_ATR_TRSLID_AXIDEVICE);
+  TranslationTable += PCI_ATR_ENTRY_SIZE;
+
+  // System Memory Support
+  SetTranslationAddressEntry (CpuIo, TranslationTable, PcdGet64 (PcdSystemMemoryBase), PcdGet64 (PcdSystemMemoryBase),
+      PcdGet64 (PcdSystemMemorySize), PCI_ATR_TRSLID_AXIMEMORY);
+  TranslationTable += PCI_ATR_ENTRY_SIZE;
+  SetTranslationAddressEntry (CpuIo, TranslationTable, ARM_JUNO_EXTRA_SYSTEM_MEMORY_BASE, ARM_JUNO_EXTRA_SYSTEM_MEMORY_BASE,
+      ARM_JUNO_EXTRA_SYSTEM_MEMORY_SZ, PCI_ATR_TRSLID_AXIMEMORY);
+
+  //
+  // AXI4 Slave 1 -> PCIE Window 0 Address Translations
+  //
+  TranslationTable = VEXPRESS_ATR_AXI4_SLV1;
+
+  // PCI ECAM Support
+  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_ECAM_BASE, PCI_ECAM_BASE, PCI_ECAM_SIZE, PCI_ATR_TRSLID_PCIE_CONF);
+  TranslationTable += PCI_ATR_ENTRY_SIZE;
+
+  // PCI IO Support, the PIO space is translated from the arm MMIO PCI_IO_BASE address to the PIO base address of 0
+  // AKA, PIO addresses used by endpoints are generally in the range of 0-64K.
+  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_IO_BASE, 0, PCI_IO_SIZE, PCI_ATR_TRSLID_PCIE_IO);
+  TranslationTable += PCI_ATR_ENTRY_SIZE;
+
+  // PCI MEM32 Support
+  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_MEM32_BASE, PCI_MEM32_BASE, PCI_MEM32_SIZE, PCI_ATR_TRSLID_PCIE_MEMORY);
+  TranslationTable += PCI_ATR_ENTRY_SIZE;
+
+  // PCI MEM64 Support
+  SetTranslationAddressEntry (CpuIo, TranslationTable, PCI_MEM64_BASE, PCI_MEM64_BASE, PCI_MEM64_SIZE, PCI_ATR_TRSLID_PCIE_MEMORY);
+
+  // Add credits
+  PCIE_ROOTPORT_WRITE32 (PCIE_VC_CRED, 0x00f0b818);
+  PCIE_ROOTPORT_WRITE32 (PCIE_VC_CRED + 4, 0x1);
+
+  // Allow ECRC
+  PCIE_ROOTPORT_WRITE32 (PCIE_PEX_SPC2, 0x6006);
+
+  // Reset controller
+  PCIE_CONTROL_WRITE32 (PCIE_CONTROL_RST_CTL, PCIE_CONTROL_RST_CTL_RCPHY_REL);
+
+  // Wait for reset
+  for (Index = 0; Index < 1000; Index++) {
+    gBS->Stall (1000);
+    PCIE_CONTROL_READ32 (PCIE_CONTROL_RST_STS, Value);
+    if ((Value & PCIE_CONTROL_RST_STS_RCPHYPLL_OUT) == PCIE_CONTROL_RST_STS_RCPHYPLL_OUT) {
+      break;
+    }
+  }
+
+  // Check for reset
+  if (!(Value & PCIE_CONTROL_RST_STS_RCPHYPLL_OUT)) {
+    DEBUG ((EFI_D_ERROR, "PCIe failed to come out of reset: %x.\n", Value));
+    return EFI_NOT_READY;
+  }
+
+  gBS->Stall (1000);
+  PCI_TRACE ("Checking link Status...");
+
+  // Wait for Link Up
+  for (Index = 0; Index < 1000; Index++) {
+    gBS->Stall (1000);
+    PCIE_ROOTPORT_READ32 (VEXPRESS_BASIC_STATUS, Value);
+    if (Value & LINK_UP) {
+      break;
+    }
+  }
+
+  // Check for link up
+  if (!(Value & LINK_UP)) {
+    DEBUG ((EFI_D_ERROR, "PCIe link not up: %x.\n", Value));
+    return EFI_NOT_READY;
+  }
+
+  PCIE_ROOTPORT_WRITE32 (PCIE_IMASK_LOCAL, PCIE_INT_MSI | PCIE_INT_INTx);
+
+  return EFI_SUCCESS;
+}
diff --git a/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h
new file mode 100644
index 000000000000..07f52c210ed9
--- /dev/null
+++ b/Platforms/ARM/Juno/Library/JunoPciHostBridgeLib/XPressRich3.h
@@ -0,0 +1,107 @@ 
+/** @file
+*  Header containing the Xpress-RICH3 PCIe Root Complex specific values
+*
+*  Copyright (c) 2011-2015, ARM Ltd. All rights reserved.
+*
+*  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
+*  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.
+*
+**/
+
+#ifndef __XPRESS_RICH3_H__
+#define __XPRESS_RICH3_H__
+
+#include <Protocol/CpuIo2.h>
+#include <Library/PcdLib.h>
+
+#define PCI_ECAM_BASE       FixedPcdGet64 (PcdPciConfigurationSpaceBaseAddress)
+#define PCI_ECAM_SIZE       FixedPcdGet64 (PcdPciConfigurationSpaceSize)
+#define PCI_IO_BASE         FixedPcdGet64 (PcdPciIoTranslation)
+#define PCI_IO_SIZE         FixedPcdGet64 (PcdPciIoSize)
+#define PCI_MEM32_BASE      FixedPcdGet64 (PcdPciMmio32Base)
+#define PCI_MEM32_SIZE      FixedPcdGet64 (PcdPciMmio32Size)
+#define PCI_MEM64_BASE      FixedPcdGet64 (PcdPciMmio64Base)
+#define PCI_MEM64_SIZE      FixedPcdGet64 (PcdPciMmio64Size)
+
+#define PCI_TRACE(txt)  DEBUG((EFI_D_VERBOSE, "ARM_PCI: " txt "\n"))
+
+#define PCIE_ROOTPORT_WRITE32(Add, Val) { UINT32 Value = (UINT32)(Val); CpuIo->Mem.Write (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieRootPortBaseAddress)+(Add)),1,&Value); }
+#define PCIE_ROOTPORT_READ32(Add, Val) { CpuIo->Mem.Read (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieRootPortBaseAddress)+(Add)),1,&Val); }
+
+#define PCIE_CONTROL_WRITE32(Add, Val) { UINT32 Value = (UINT32)(Val); CpuIo->Mem.Write (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieControlBaseAddress)+(Add)),1,&Value); }
+#define PCIE_CONTROL_READ32(Add, Val) { CpuIo->Mem.Read (CpuIo,EfiCpuIoWidthUint32,(UINT64)(PcdGet64 (PcdPcieControlBaseAddress)+(Add)),1,&Val); }
+
+/*
+ * Bridge Internal Registers
+ */
+
+// PCIe Available Credit Settings
+#define PCIE_VC_CRED                            0x090
+// PCIe PCI Standard Configuration Identification Settings registers
+#define PCIE_PCI_IDS                            0x098
+#define PCIE_PCI_IDS_CLASSCODE_OFFSET           0x4
+// PCIe Specific 2 Capabilities Settings
+#define PCIE_PEX_SPC2                           0x0d8
+// PCIe Windows Settings register
+#define PCIE_BAR_WIN                            0x0FC
+// Local Processor Interrupt Mask
+#define PCIE_IMASK_LOCAL                        0x180
+
+#define PCIE_BAR_WIN_SUPPORT_IO                 BIT0
+#define PCIE_BAR_WIN_SUPPORT_IO32               BIT1
+#define PCIE_BAR_WIN_SUPPORT_MEM                BIT2
+#define PCIE_BAR_WIN_SUPPORT_MEM64              BIT3
+
+#define PCIE_INT_MSI                            BIT28
+#define PCIE_INT_A                              BIT24
+#define PCIE_INT_B                              BIT25
+#define PCIE_INT_C                              BIT26
+#define PCIE_INT_D                              BIT27
+#define PCIE_INT_INTx                           (PCIE_INT_A | PCIE_INT_B |\
+                                                 PCIE_INT_C | PCIE_INT_D)
+
+/*
+ * PCIe Control Registers
+ */
+#define PCIE_CONTROL_RST_CTL     0x1004
+#define PCIE_CONTROL_RST_STS     0x1008
+
+/*
+ * PCI Express Address Translation registers
+ * All are offsets from PcdPcieControlBaseAddress
+ */
+#define VEXPRESS_ATR_PCIE_WIN0    0x600
+#define VEXPRESS_ATR_AXI4_SLV0    0x800
+#define VEXPRESS_ATR_AXI4_SLV1    0x820
+
+#define PCI_ATR_ENTRY_SIZE           0x20
+#define PCI_ATR_SRC_ADDR_LOW_SIZE    0
+#define PCI_ATR_SRC_ADDR_HI          0x4
+#define PCI_ATR_TRSL_ADDR_LOW        0x8
+#define PCI_ATR_TRSL_ADDR_HI         0xc
+#define PCI_ATR_TRSL_PARAM           0x10
+
+#define PCI_ATR_TRSLID_AXIDEVICE     0x420004
+#define PCI_ATR_TRSLID_AXIMEMORY     0x4e0004
+#define PCI_ATR_TRSLID_PCIE_CONF     0x000001
+#define PCI_ATR_TRSLID_PCIE_IO       0x020000
+#define PCI_ATR_TRSLID_PCIE_MEMORY   0x000000
+
+#define PCIE_CONTROL_RST_CTL_RC_REL        (1 << 1)
+#define PCIE_CONTROL_RST_CTL_PHY_REL       (1 << 0)
+#define PCIE_CONTROL_RST_CTL_RCPHY_REL     (PCIE_CONTROL_RST_CTL_RC_REL | PCIE_CONTROL_RST_CTL_PHY_REL)
+
+#define PCIE_CONTROL_RST_STS_RC_ST         (1 << 2)
+#define PCIE_CONTROL_RST_STS_PHY_ST        (1 << 1)
+#define PCIE_CONTROL_RST_STS_PLL_ST        (1 << 0)
+#define PCIE_CONTROL_RST_STS_RCPHYPLL_OUT  (PCIE_CONTROL_RST_STS_RC_ST | PCIE_CONTROL_RST_STS_PHY_ST | PCIE_CONTROL_RST_STS_PLL_ST)
+
+#define VEXPRESS_BASIC_STATUS       0x18
+#define LINK_UP                     0xff
+
+#endif