/** @file
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PCI Host Bridge Library instance for ARM FVP Model
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Copyright (c) 2021, Arm Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiDxe.h>
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#include <Library/DebugLib.h>
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#include <Library/DevicePathLib.h>
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#include <Library/IoLib.h>
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#include <Library/PcdLib.h>
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#include <Library/PciHostBridgeLib.h>
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#include <Protocol/PciHostBridgeResourceAllocation.h>
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#include <Protocol/PciRootBridgeIo.h>
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#include <ArmPlatform.h>
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#pragma pack(1)
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/** A structure describing the PCI root bridge device path.
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*/
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typedef struct {
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/// ACPI Device path.
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ACPI_HID_DEVICE_PATH AcpiDevicePath;
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/// END Device Path tag.
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EFI_DEVICE_PATH_PROTOCOL EndDevicePath;
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} EFI_PCI_ROOT_BRIDGE_DEVICE_PATH;
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#pragma pack ()
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STATIC EFI_PCI_ROOT_BRIDGE_DEVICE_PATH mEfiPciRootBridgeDevicePath = {
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// ACPI device path
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{
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{
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ACPI_DEVICE_PATH,
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ACPI_DP,
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{
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(UINT8)(sizeof (ACPI_HID_DEVICE_PATH)),
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(UINT8)((sizeof (ACPI_HID_DEVICE_PATH)) >> 8)
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}
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},
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EISA_PNP_ID (0x0A08), // PCIe
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0
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},
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// End device path tag
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{
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END_DEVICE_PATH_TYPE,
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END_ENTIRE_DEVICE_PATH_SUBTYPE,
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{
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END_DEVICE_PATH_LENGTH,
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0
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}
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}
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};
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STATIC PCI_ROOT_BRIDGE mRootBridge = {
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0, // Segment
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0, // Supports
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0, // Attributes
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FALSE, // DmaAbove4G
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FALSE, // NoExtendedConfigSpace
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FALSE, // ResourceAssigned
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EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM | // AllocationAttributes
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EFI_PCI_HOST_BRIDGE_MEM64_DECODE,
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{
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// Bus
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FixedPcdGet32 (PcdPciBusMin),
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FixedPcdGet32 (PcdPciBusMax)
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},
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{
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// Io
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FixedPcdGet64 (PcdPciIoBase),
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FixedPcdGet64 (PcdPciIoBase) + FixedPcdGet64 (PcdPciIoSize) - 1
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},
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{
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// Mem
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FixedPcdGet32 (PcdPciMmio32Base),
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FixedPcdGet32 (PcdPciMmio32Base) + FixedPcdGet32 (PcdPciMmio32Size) - 1
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},
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{
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// MemAbove4G
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FixedPcdGet64 (PcdPciMmio64Base),
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FixedPcdGet64 (PcdPciMmio64Base) + FixedPcdGet64 (PcdPciMmio64Size) - 1
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},
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{
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// PMem
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MAX_UINT64,
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0
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},
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{
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// PMemAbove4G
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MAX_UINT64,
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0
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},
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(EFI_DEVICE_PATH_PROTOCOL *)&mEfiPciRootBridgeDevicePath
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};
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#ifndef MDEPKG_NDEBUG
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STATIC CONST CHAR16 mAcpiAddrSpaceTypeStr[][4] = {
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L"Mem", L"I/O", L"Bus"
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};
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#endif
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/**
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Return all the root bridge instances in an array.
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@param [out] Count Return the count of root bridge instances.
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@returns All the root bridge instances in an array.
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The array should be passed into PciHostBridgeFreeRootBridges()
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when it's not used.
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**/
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PCI_ROOT_BRIDGE *
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EFIAPI
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PciHostBridgeGetRootBridges (
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OUT UINTN *Count
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)
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{
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UINT32 SysId;
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// Check if the platform is FVP RevC
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SysId = MmioRead32 (ARM_VE_SYS_ID_REG);
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if ((SysId & ARM_FVP_SYS_ID_REV_MASK) == ARM_FVP_BASE_REVC_REV) {
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// There is a single Root Bridge instance on the FVP RevC Model
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*Count = 1;
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return &mRootBridge;
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}
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// Other FVP models do not have PCIe
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*Count = 0;
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return NULL;
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}
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/**
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Free the root bridge instances array returned
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from PciHostBridgeGetRootBridges().
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@param [in] Bridges The root bridge instances array.
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@param [in] Count The count of the array.
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**/
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VOID
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EFIAPI
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PciHostBridgeFreeRootBridges (
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IN PCI_ROOT_BRIDGE *Bridges,
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IN UINTN Count
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)
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{
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}
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/**
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Inform the platform that the resource conflict happens.
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@param [in] HostBridgeHandle Handle of the Host Bridge.
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@param [in] Configuration Pointer to PCI I/O and PCI memory resource
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descriptors. The Configuration contains the
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resources for all the root bridges. The
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resource for each root bridge is terminated
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with END descriptor and an additional END is
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appended indicating the end of the entire
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resources. The resource descriptor field
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values follow the description in
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EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
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.SubmitResources().
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**/
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VOID
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EFIAPI
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PciHostBridgeResourceConflict (
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IN EFI_HANDLE HostBridgeHandle,
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IN VOID *Configuration
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)
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{
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EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
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UINTN RootBridgeIndex;
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DEBUG ((DEBUG_ERROR, "PciHostBridge: Resource conflict happens!\n"));
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RootBridgeIndex = 0;
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Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
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while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
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DEBUG ((DEBUG_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
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for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
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ASSERT (Descriptor->ResType < ARRAY_SIZE (mAcpiAddrSpaceTypeStr));
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DEBUG ((
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DEBUG_ERROR,
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" %s: Length/Alignment = 0x%lx / 0x%lx\n",
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mAcpiAddrSpaceTypeStr[Descriptor->ResType],
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Descriptor->AddrLen, Descriptor->AddrRangeMax
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));
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if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
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DEBUG ((
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DEBUG_ERROR,
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" Granularity/SpecificFlag = %ld / %02x%s\n",
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Descriptor->AddrSpaceGranularity,
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Descriptor->SpecificFlag,
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((Descriptor->SpecificFlag &
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EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE
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) != 0) ? L" (Prefetchable)" : L""
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));
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}
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}
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// Skip the END descriptor for root bridge
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ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);
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Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(
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(EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1
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);
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}
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}
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