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/** @file
*
* Copyright (c) 2011-2014, ARM Limited. All rights reserved.
* Copyright (c) 2014-2020, Linaro Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <PiPei.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/PcdLib.h>
#include <Library/PeiServicesLib.h>
#include <libfdt.h>
#include <Guid/EarlyPL011BaseAddress.h>
#include <Guid/FdtHob.h>
STATIC CONST EFI_PEI_PPI_DESCRIPTOR mTpm2DiscoveredPpi = {
EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
&gOvmfTpmDiscoveredPpiGuid,
NULL
};
STATIC CONST EFI_PEI_PPI_DESCRIPTOR mTpm2InitializationDonePpi = {
EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
&gPeiTpmInitializationDonePpiGuid,
NULL
};
EFI_STATUS
EFIAPI
PlatformPeim (
VOID
)
{
VOID *Base;
VOID *NewBase;
UINTN FdtSize;
UINTN FdtPages;
UINT64 *FdtHobData;
UINT64 *UartHobData;
INT32 Node, Prev;
INT32 Parent, Depth;
CONST CHAR8 *Compatible;
CONST CHAR8 *CompItem;
CONST CHAR8 *NodeStatus;
INT32 Len;
INT32 RangesLen;
INT32 StatusLen;
CONST UINT64 *RegProp;
CONST UINT32 *RangesProp;
UINT64 UartBase;
UINT64 TpmBase;
EFI_STATUS Status;
Base = (VOID*)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
ASSERT (Base != NULL);
ASSERT (fdt_check_header (Base) == 0);
FdtSize = fdt_totalsize (Base) + PcdGet32 (PcdDeviceTreeAllocationPadding);
FdtPages = EFI_SIZE_TO_PAGES (FdtSize);
NewBase = AllocatePages (FdtPages);
ASSERT (NewBase != NULL);
fdt_open_into (Base, NewBase, EFI_PAGES_TO_SIZE (FdtPages));
FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof *FdtHobData);
ASSERT (FdtHobData != NULL);
*FdtHobData = (UINTN)NewBase;
UartHobData = BuildGuidHob (&gEarlyPL011BaseAddressGuid, sizeof *UartHobData);
ASSERT (UartHobData != NULL);
*UartHobData = 0;
TpmBase = 0;
for (Prev = Depth = 0;; Prev = Node) {
Node = fdt_next_node (Base, Prev, &Depth);
if (Node < 0) {
break;
}
if (Depth == 1) {
Parent = Node;
}
Compatible = fdt_getprop (Base, Node, "compatible", &Len);
//
// Iterate over the NULL-separated items in the compatible string
//
for (CompItem = Compatible; CompItem != NULL && CompItem < Compatible + Len;
CompItem += 1 + AsciiStrLen (CompItem)) {
if (AsciiStrCmp (CompItem, "arm,pl011") == 0) {
NodeStatus = fdt_getprop (Base, Node, "status", &StatusLen);
if (NodeStatus != NULL && AsciiStrCmp (NodeStatus, "okay") != 0) {
continue;
}
RegProp = fdt_getprop (Base, Node, "reg", &Len);
ASSERT (Len == 16);
UartBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
DEBUG ((EFI_D_INFO, "%a: PL011 UART @ 0x%lx\n", __FUNCTION__, UartBase));
*UartHobData = UartBase;
break;
} else if (FeaturePcdGet (PcdTpm2SupportEnabled) &&
AsciiStrCmp (CompItem, "tcg,tpm-tis-mmio") == 0) {
RegProp = fdt_getprop (Base, Node, "reg", &Len);
ASSERT (Len == 8 || Len == 16);
if (Len == 8) {
TpmBase = fdt32_to_cpu (RegProp[0]);
} else if (Len == 16) {
TpmBase = fdt64_to_cpu (ReadUnaligned64 ((UINT64 *)RegProp));
}
if (Depth > 1) {
//
// QEMU/mach-virt may put the TPM on the platform bus, in which case
// we have to take its 'ranges' property into account to translate the
// MMIO address. This consists of a <child base, parent base, size>
// tuple, where the child base and the size use the same number of
// cells as the 'reg' property above, and the parent base uses 2 cells
//
RangesProp = fdt_getprop (Base, Parent, "ranges", &RangesLen);
ASSERT (RangesProp != NULL);
//
// a plain 'ranges' attribute without a value implies a 1:1 mapping
//
if (RangesLen != 0) {
//
// assume a single translated range with 2 cells for the parent base
//
if (RangesLen != Len + 2 * sizeof (UINT32)) {
DEBUG ((DEBUG_WARN,
"%a: 'ranges' property has unexpected size %d\n",
__FUNCTION__, RangesLen));
break;
}
if (Len == 8) {
TpmBase -= fdt32_to_cpu (RangesProp[0]);
} else {
TpmBase -= fdt64_to_cpu (ReadUnaligned64 ((UINT64 *)RangesProp));
}
//
// advance RangesProp to the parent bus address
//
RangesProp = (UINT32 *)((UINT8 *)RangesProp + Len / 2);
TpmBase += fdt64_to_cpu (ReadUnaligned64 ((UINT64 *)RangesProp));
}
}
break;
}
}
}
if (FeaturePcdGet (PcdTpm2SupportEnabled)) {
if (TpmBase != 0) {
DEBUG ((DEBUG_INFO, "%a: TPM @ 0x%lx\n", __FUNCTION__, TpmBase));
Status = (EFI_STATUS)PcdSet64S (PcdTpmBaseAddress, TpmBase);
ASSERT_EFI_ERROR (Status);
Status = PeiServicesInstallPpi (&mTpm2DiscoveredPpi);
} else {
Status = PeiServicesInstallPpi (&mTpm2InitializationDonePpi);
}
ASSERT_EFI_ERROR (Status);
}
BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
return EFI_SUCCESS;
}
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