Vlv2TbltDevicePkg/Library/I2CLibPei/I2CDelayPei.c

   1 /** @file
   2   MicroSecondDelay implementation of ACPI Timer.
   3
   4   Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 --*/
   9
  10 #include "PiPei.h"
  11 #include "I2CAccess.h"
  12 #include "I2CDelayPei.h"
  13 #include <Library/DebugLib.h>
  14 #include <Library/PeiServicesTablePointerLib.h>
  15 #include <Ppi/Stall.h>
  16
  17 /**
  18   Stalls the CPU for at least the given number of microseconds.
  19   Stalls the CPU for the number of microseconds specified by MicroSeconds.
  20
  21   @param  MicroSeconds  The minimum number of microseconds to delay.
  22
  23   @return EFI_STATUS
  24
  25 **/
  26 EFI_STATUS
  27 EFIAPI
  28 MicroSecondDelay (
  29   IN      UINTN                     MicroSeconds
  30   )
  31 {
  32
  33   EFI_PEI_STALL_PPI              *StallPpi;
  34   EFI_STATUS                     Status;
  35   CONST EFI_PEI_SERVICES         **PeiServices;
  36
  37   PeiServices = GetPeiServicesTablePointer();
  38
  39
  40   Status = (**PeiServices).LocatePpi (PeiServices, &gEfiPeiStallPpiGuid, 0, NULL, &StallPpi);
  41   ASSERT(!EFI_ERROR(Status));
  42
  43   StallPpi->Stall (PeiServices, StallPpi, MicroSeconds);
  44
  45   return EFI_SUCCESS;
  46 }