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- /** @file
- *
- * Copyright (c) 2011-2014, ARM Limited. All rights reserved.
- * Copyright (c) 2014, 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 <libfdt.h>
- #include <Guid/EarlyPL011BaseAddress.h>
- #include <Guid/FdtHob.h>
- EFI_STATUS
- EFIAPI
- PlatformPeim (
- VOID
- )
- {
- VOID *Base;
- VOID *NewBase;
- UINTN FdtSize;
- UINTN FdtPages;
- UINT64 *FdtHobData;
- UINT64 *UartHobData;
- INT32 Node, Prev;
- CONST CHAR8 *Compatible;
- CONST CHAR8 *CompItem;
- CONST CHAR8 *NodeStatus;
- INT32 Len;
- INT32 StatusLen;
- CONST UINT64 *RegProp;
- UINT64 UartBase;
- 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;
- //
- // Look for a UART node
- //
- for (Prev = 0;; Prev = Node) {
- Node = fdt_next_node (Base, Prev, NULL);
- if (Node < 0) {
- break;
- }
- //
- // Check for UART 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;
- }
- }
- }
- BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
- return EFI_SUCCESS;
- }
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