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- /** @file
- Library instance of PciHostBridgeLib library class for coreboot.
- Copyright (C) 2016, Red Hat, Inc.
- Copyright (c) 2016, 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
- 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 <IndustryStandard/Pci.h>
- #include <Protocol/PciHostBridgeResourceAllocation.h>
- #include <Protocol/PciRootBridgeIo.h>
- #include <Library/BaseMemoryLib.h>
- #include <Library/DebugLib.h>
- #include <Library/DevicePathLib.h>
- #include <Library/MemoryAllocationLib.h>
- #include <Library/PciHostBridgeLib.h>
- #include <Library/PciLib.h>
- #include "PciHostBridge.h"
- STATIC
- CONST
- CB_PCI_ROOT_BRIDGE_DEVICE_PATH mRootBridgeDevicePathTemplate = {
- {
- {
- ACPI_DEVICE_PATH,
- ACPI_DP,
- {
- (UINT8) (sizeof(ACPI_HID_DEVICE_PATH)),
- (UINT8) ((sizeof(ACPI_HID_DEVICE_PATH)) >> 8)
- }
- },
- EISA_PNP_ID(0x0A03), // HID
- 0 // UID
- },
- {
- END_DEVICE_PATH_TYPE,
- END_ENTIRE_DEVICE_PATH_SUBTYPE,
- {
- END_DEVICE_PATH_LENGTH,
- 0
- }
- }
- };
- /**
- Initialize a PCI_ROOT_BRIDGE structure.
- @param[in] Supports Supported attributes.
- @param[in] Attributes Initial attributes.
- @param[in] AllocAttributes Allocation attributes.
- @param[in] RootBusNumber The bus number to store in RootBus.
- @param[in] MaxSubBusNumber The inclusive maximum bus number that can be
- assigned to any subordinate bus found behind any
- PCI bridge hanging off this root bus.
- The caller is responsible for ensuring that
- RootBusNumber <= MaxSubBusNumber. If
- RootBusNumber equals MaxSubBusNumber, then the
- root bus has no room for subordinate buses.
- @param[in] Io IO aperture.
- @param[in] Mem MMIO aperture.
- @param[in] MemAbove4G MMIO aperture above 4G.
- @param[in] PMem Prefetchable MMIO aperture.
- @param[in] PMemAbove4G Prefetchable MMIO aperture above 4G.
- @param[out] RootBus The PCI_ROOT_BRIDGE structure (allocated by the
- caller) that should be filled in by this
- function.
- @retval EFI_SUCCESS Initialization successful. A device path
- consisting of an ACPI device path node, with
- UID = RootBusNumber, has been allocated and
- linked into RootBus.
- @retval EFI_OUT_OF_RESOURCES Memory allocation failed.
- **/
- EFI_STATUS
- InitRootBridge (
- IN UINT64 Supports,
- IN UINT64 Attributes,
- IN UINT64 AllocAttributes,
- IN UINT8 RootBusNumber,
- IN UINT8 MaxSubBusNumber,
- IN PCI_ROOT_BRIDGE_APERTURE *Io,
- IN PCI_ROOT_BRIDGE_APERTURE *Mem,
- IN PCI_ROOT_BRIDGE_APERTURE *MemAbove4G,
- IN PCI_ROOT_BRIDGE_APERTURE *PMem,
- IN PCI_ROOT_BRIDGE_APERTURE *PMemAbove4G,
- OUT PCI_ROOT_BRIDGE *RootBus
- )
- {
- CB_PCI_ROOT_BRIDGE_DEVICE_PATH *DevicePath;
- //
- // Be safe if other fields are added to PCI_ROOT_BRIDGE later.
- //
- ZeroMem (RootBus, sizeof *RootBus);
- RootBus->Segment = 0;
- RootBus->Supports = Supports;
- RootBus->Attributes = Attributes;
- RootBus->DmaAbove4G = FALSE;
- RootBus->AllocationAttributes = AllocAttributes;
- RootBus->Bus.Base = RootBusNumber;
- RootBus->Bus.Limit = MaxSubBusNumber;
- CopyMem (&RootBus->Io, Io, sizeof (*Io));
- CopyMem (&RootBus->Mem, Mem, sizeof (*Mem));
- CopyMem (&RootBus->MemAbove4G, MemAbove4G, sizeof (*MemAbove4G));
- CopyMem (&RootBus->PMem, PMem, sizeof (*PMem));
- CopyMem (&RootBus->PMemAbove4G, PMemAbove4G, sizeof (*PMemAbove4G));
- RootBus->NoExtendedConfigSpace = FALSE;
- DevicePath = AllocateCopyPool (sizeof (mRootBridgeDevicePathTemplate),
- &mRootBridgeDevicePathTemplate);
- if (DevicePath == NULL) {
- DEBUG ((EFI_D_ERROR, "%a: %r\n", __FUNCTION__, EFI_OUT_OF_RESOURCES));
- return EFI_OUT_OF_RESOURCES;
- }
- DevicePath->AcpiDevicePath.UID = RootBusNumber;
- RootBus->DevicePath = (EFI_DEVICE_PATH_PROTOCOL *)DevicePath;
- DEBUG ((EFI_D_INFO,
- "%a: populated root bus %d, with room for %d subordinate bus(es)\n",
- __FUNCTION__, RootBusNumber, MaxSubBusNumber - RootBusNumber));
- return EFI_SUCCESS;
- }
- /**
- 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
- )
- {
- return ScanForRootBridges (Count);
- }
- /**
- Free the root bridge instances array returned from
- PciHostBridgeGetRootBridges().
- @param The root bridge instances array.
- @param The count of the array.
- **/
- VOID
- EFIAPI
- PciHostBridgeFreeRootBridges (
- PCI_ROOT_BRIDGE *Bridges,
- UINTN Count
- )
- {
- if (Bridges == NULL && Count == 0) {
- return;
- }
- ASSERT (Bridges != NULL && Count > 0);
- do {
- --Count;
- FreePool (Bridges[Count].DevicePath);
- } while (Count > 0);
- FreePool (Bridges);
- }
- /**
- 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
- )
- {
- //
- // coreboot UEFI Payload does not do PCI enumeration and should not call this
- // library interface.
- //
- ASSERT (FALSE);
- }
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