ArmPlatformPkg/ArmVirtualizationPkg/Library/PlatformPeiLib/PlatformPeiLib.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2014, ARM Limited. All rights reserved.
   4 *  Copyright (c) 2014, Linaro Limited. All rights reserved.
   5 *
   6 *  This program and the accompanying materials
   7 *  are licensed and made available under the terms and conditions of the BSD License
   8 *  which accompanies this distribution.  The full text of the license may be found at
   9 *  http://opensource.org/licenses/bsd-license.php
  10 *
  11 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 *
  14 **/
  15
  16 #include <PiPei.h>
  17
  18 #include <Library/MemoryAllocationLib.h>
  19 #include <Library/DebugLib.h>
  20 #include <Library/HobLib.h>
  21 #include <Library/PcdLib.h>
  22 #include <libfdt.h>
  23
  24 #include <Guid/EarlyPL011BaseAddress.h>
  25
  26 EFI_STATUS
  27 EFIAPI
  28 PlatformPeim (
  29   VOID
  30   )
  31 {
  32   VOID               *Base;
  33   VOID               *NewBase;
  34   UINTN              FdtSize;
  35   UINT64             *UartHobData;
  36   INT32              Node, Prev;
  37   CONST CHAR8        *Compatible;
  38   CONST CHAR8        *CompItem;
  39   INT32              Len;
  40   CONST UINT64       *RegProp;
  41   UINT64             UartBase;
  42
  43
  44   Base = (VOID*)(UINTN)FixedPcdGet64 (PcdDeviceTreeInitialBaseAddress);
  45   ASSERT (fdt_check_header (Base) == 0);
  46
  47   FdtSize = fdt_totalsize (Base);
  48   NewBase = AllocatePages (EFI_SIZE_TO_PAGES (FdtSize));
  49   ASSERT (NewBase != NULL);
  50
  51   CopyMem (NewBase, Base, FdtSize);
  52   PcdSet64 (PcdDeviceTreeBaseAddress, (UINT64)(UINTN)NewBase);
  53
  54   UartHobData = BuildGuidHob (&gEarlyPL011BaseAddressGuid, sizeof *UartHobData);
  55   ASSERT (UartHobData != NULL);
  56   *UartHobData = 0;
  57
  58   //
  59   // Look for a UART node
  60   //
  61   for (Prev = 0;; Prev = Node) {
  62     Node = fdt_next_node (Base, Prev, NULL);
  63     if (Node < 0) {
  64       break;
  65     }
  66
  67     //
  68     // Check for UART node
  69     //
  70     Compatible = fdt_getprop (Base, Node, "compatible", &Len);
  71
  72     //
  73     // Iterate over the NULL-separated items in the compatible string
  74     //
  75     for (CompItem = Compatible; CompItem != NULL && CompItem < Compatible + Len;
  76       CompItem += 1 + AsciiStrLen (CompItem)) {
  77
  78       if (AsciiStrCmp (CompItem, "arm,pl011") == 0) {
  79         RegProp = fdt_getprop (Base, Node, "reg", &Len);
  80         ASSERT (Len == 16);
  81
  82         UartBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
  83
  84         DEBUG ((EFI_D_INFO, "%a: PL011 UART @ 0x%lx\n", __FUNCTION__, UartBase));
  85
  86         *UartHobData = UartBase;
  87         break;
  88       }
  89     }
  90   }
  91
  92   BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
  93
  94   return EFI_SUCCESS;
  95 }