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/** @file
PCI Host Bridge utility functions for ArmVirt.
Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <IndustryStandard/Acpi10.h>
#include <IndustryStandard/Pci.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/PciHostBridgeLib.h>
#include <Library/PciHostBridgeUtilityLib.h>
#include <Library/PciLib.h>
#pragma pack(1)
typedef struct {
ACPI_HID_DEVICE_PATH AcpiDevicePath;
EFI_DEVICE_PATH_PROTOCOL EndDevicePath;
} EFI_PCI_ROOT_BRIDGE_DEVICE_PATH;
#pragma pack ()
GLOBAL_REMOVE_IF_UNREFERENCED
CHAR16 *mPciHostBridgeAcpiAddressSpaceTypeStr[] = {
L"Mem",
L"I/O",
L"Bus"
};
STATIC CONST 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), // HID
0 // UID
},
{
END_DEVICE_PATH_TYPE,
END_ENTIRE_DEVICE_PATH_SUBTYPE,
{
END_DEVICE_PATH_LENGTH,
0
}
}
};
GLOBAL_REMOVE_IF_UNREFERENCED
CHAR16 *mPciHostBridgeLibAcpiAddressSpaceTypeStr[] = {
L"Mem", L"I/O", L"Bus"
};
STATIC PCI_ROOT_BRIDGE mRootBridge;
/**
Utility function to return all the root bridge instances in an array.
@param [out] Count The number of root bridge instances.
@param [in] Attributes Initial attributes.
@param [in] AllocationAttributes Allocation attributes.
@param [in] DmaAbove4G DMA above 4GB memory.
@param [in] NoExtendedConfigSpace No Extended Config Space.
@param [in] BusMin Minimum Bus number, inclusive.
@param [in] BusMax Maximum Bus number, inclusive.
@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.
@return All the root bridge instances in an array.
**/
PCI_ROOT_BRIDGE *
EFIAPI
PciHostBridgeUtilityGetRootBridges (
OUT UINTN *Count,
IN UINT64 Attributes,
IN UINT64 AllocationAttributes,
IN BOOLEAN DmaAbove4G,
IN BOOLEAN NoExtendedConfigSpace,
IN UINTN BusMin,
IN UINTN BusMax,
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
)
{
if ((Count == NULL) ||
(Io == NULL) ||
(Mem == NULL) ||
(MemAbove4G == NULL) ||
(PMem == NULL) ||
(PMemAbove4G == NULL)) {
return NULL;
}
*Count = 1;
mRootBridge.Segment = 0;
mRootBridge.Supports = Attributes;
mRootBridge.Attributes = Attributes;
mRootBridge.DmaAbove4G = DmaAbove4G;
mRootBridge.NoExtendedConfigSpace = NoExtendedConfigSpace;
mRootBridge.ResourceAssigned = FALSE;
mRootBridge.AllocationAttributes = AllocationAttributes;
mRootBridge.Bus.Base = BusMin;
mRootBridge.Bus.Limit = BusMax;
mRootBridge.Io.Base = Io->Base;
mRootBridge.Io.Limit = Io->Limit;
mRootBridge.Mem.Base = Mem->Base;
mRootBridge.Mem.Limit = Mem->Limit;
mRootBridge.MemAbove4G.Base = MemAbove4G->Base;
mRootBridge.MemAbove4G.Limit = MemAbove4G->Limit;
mRootBridge.PMem.Base = PMem->Base;
mRootBridge.PMem.Limit = PMem->Limit;
mRootBridge.PMemAbove4G.Base = PMemAbove4G->Base;
mRootBridge.PMemAbove4G.Limit = PMemAbove4G->Limit;
mRootBridge.DevicePath =
(EFI_DEVICE_PATH_PROTOCOL*)&mEfiPciRootBridgeDevicePath;
return &mRootBridge;
}
/**
Utility function to free root bridge instances array from
PciHostBridgeUtilityGetRootBridges().
@param[in] Bridges The root bridge instances array.
@param[in] Count The count of the array.
**/
VOID
EFIAPI
PciHostBridgeUtilityFreeRootBridges (
IN PCI_ROOT_BRIDGE *Bridges,
IN UINTN Count
)
{
// Nothing to do here.
}
/**
Utility function to inform the platform that the resource conflict happens.
@param[in] 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
PciHostBridgeUtilityResourceConflict (
IN VOID *Configuration
)
{
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
UINTN RootBridgeIndex;
DEBUG ((DEBUG_ERROR, "PciHostBridge: Resource conflict happens!\n"));
RootBridgeIndex = 0;
Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR*)Configuration;
while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
DEBUG ((DEBUG_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
ASSERT (Descriptor->ResType <
ARRAY_SIZE (mPciHostBridgeAcpiAddressSpaceTypeStr)
);
DEBUG ((
DEBUG_ERROR,
" %s: Length/Alignment = 0x%lx / 0x%lx\n",
mPciHostBridgeAcpiAddressSpaceTypeStr[Descriptor->ResType],
Descriptor->AddrLen,
Descriptor->AddrRangeMax
));
if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
DEBUG ((
DEBUG_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
);
}
}
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