337d450e20
This is partially motivated by the desire to use PrePi in a virt environment, and in that configuration, ArmPlatformInitializeSystemMemory() is never called. But actually, this is a more suitable place anyway. Contributed-under: TianoCore Contribution Agreement 1.0 Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Olivier Martin <olivier.martin@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16958 6f19259b-4bc3-4df7-8a09-765794883524
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/** @file
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*
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* Copyright (c) 2011-2014, ARM Limited. All rights reserved.
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* Copyright (c) 2014, Linaro Limited. All rights reserved.
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*
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* This program and the accompanying materials
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* are licensed and made available under the terms and conditions of the BSD License
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* which accompanies this distribution. The full text of the license may be found at
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* http://opensource.org/licenses/bsd-license.php
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*
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* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*
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**/
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#include <PiPei.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/PcdLib.h>
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#include <libfdt.h>
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#include <Guid/EarlyPL011BaseAddress.h>
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EFI_STATUS
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EFIAPI
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PlatformPeim (
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VOID
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)
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{
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VOID *Base;
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VOID *NewBase;
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UINTN FdtSize;
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UINT64 *UartHobData;
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INT32 Node, Prev;
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CONST CHAR8 *Compatible;
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CONST CHAR8 *CompItem;
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INT32 Len;
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CONST UINT64 *RegProp;
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UINT64 UartBase;
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Base = (VOID*)(UINTN)FixedPcdGet64 (PcdDeviceTreeInitialBaseAddress);
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ASSERT (fdt_check_header (Base) == 0);
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FdtSize = fdt_totalsize (Base);
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NewBase = AllocatePages (EFI_SIZE_TO_PAGES (FdtSize));
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ASSERT (NewBase != NULL);
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CopyMem (NewBase, Base, FdtSize);
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PcdSet64 (PcdDeviceTreeBaseAddress, (UINT64)(UINTN)NewBase);
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UartHobData = BuildGuidHob (&gEarlyPL011BaseAddressGuid, sizeof *UartHobData);
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ASSERT (UartHobData != NULL);
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*UartHobData = 0;
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//
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// Look for a UART node
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//
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for (Prev = 0;; Prev = Node) {
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Node = fdt_next_node (Base, Prev, NULL);
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if (Node < 0) {
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break;
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}
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//
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// Check for UART node
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//
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Compatible = fdt_getprop (Base, Node, "compatible", &Len);
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//
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// Iterate over the NULL-separated items in the compatible string
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//
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for (CompItem = Compatible; CompItem != NULL && CompItem < Compatible + Len;
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CompItem += 1 + AsciiStrLen (CompItem)) {
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if (AsciiStrCmp (CompItem, "arm,pl011") == 0) {
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RegProp = fdt_getprop (Base, Node, "reg", &Len);
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ASSERT (Len == 16);
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UartBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
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DEBUG ((EFI_D_INFO, "%a: PL011 UART @ 0x%lx\n", __FUNCTION__, UartBase));
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*UartHobData = UartBase;
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break;
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}
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}
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}
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BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
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return EFI_SUCCESS;
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}
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