audk/ArmVirtPkg/Library/ArmVirtTimerFdtClientLib/ArmVirtTimerFdtClientLib.c

/** @file
  FDT client library for ARM's TimerDxe

  Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>

  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <Uefi.h>

#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>

#include <Protocol/FdtClient.h>

#pragma pack (1)
typedef struct {
  UINT32  Type;
  UINT32  Number;
  UINT32  Flags;
} INTERRUPT_PROPERTY;
#pragma pack ()

RETURN_STATUS
EFIAPI
ArmVirtTimerFdtClientLibConstructor (
  VOID
  )
{
  EFI_STATUS                    Status;
  FDT_CLIENT_PROTOCOL           *FdtClient;
  CONST INTERRUPT_PROPERTY      *InterruptProp;
  UINT32                        PropSize;
  INT32                         SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum;
  RETURN_STATUS                 PcdStatus;

  Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
                  (VOID **)&FdtClient);
  ASSERT_EFI_ERROR (Status);

  Status = FdtClient->FindCompatibleNodeProperty (FdtClient, "arm,armv7-timer",
                        "interrupts", (CONST VOID **)&InterruptProp,
                        &PropSize);
  if (Status == EFI_NOT_FOUND) {
    Status = FdtClient->FindCompatibleNodeProperty (FdtClient,
                          "arm,armv8-timer", "interrupts",
                          (CONST VOID **)&InterruptProp,
                          &PropSize);
  }

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // - interrupts : Interrupt list for secure, non-secure, virtual and
  //  hypervisor timers, in that order.
  //
  ASSERT (PropSize == 36 || PropSize == 48);

  SecIntrNum = SwapBytes32 (InterruptProp[0].Number)
               + (InterruptProp[0].Type ? 16 : 0);
  IntrNum = SwapBytes32 (InterruptProp[1].Number)
            + (InterruptProp[1].Type ? 16 : 0);
  VirtIntrNum = SwapBytes32 (InterruptProp[2].Number)
                + (InterruptProp[2].Type ? 16 : 0);
  HypIntrNum = PropSize < 48 ? 0 : SwapBytes32 (InterruptProp[3].Number)
                                   + (InterruptProp[3].Type ? 16 : 0);

  DEBUG ((EFI_D_INFO, "Found Timer interrupts %d, %d, %d, %d\n",
    SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum));

  PcdStatus = PcdSet32S (PcdArmArchTimerSecIntrNum, SecIntrNum);
  ASSERT_RETURN_ERROR (PcdStatus);
  PcdStatus = PcdSet32S (PcdArmArchTimerIntrNum, IntrNum);
  ASSERT_RETURN_ERROR (PcdStatus);
  PcdStatus = PcdSet32S (PcdArmArchTimerVirtIntrNum, VirtIntrNum);
  ASSERT_RETURN_ERROR (PcdStatus);
  PcdStatus = PcdSet32S (PcdArmArchTimerHypIntrNum, HypIntrNum);
  ASSERT_RETURN_ERROR (PcdStatus);

  return EFI_SUCCESS;
}