ArmPkg/Drivers/PL390Gic/PL390Gic.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2012, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include <Uefi.h>
  16 #include <Library/IoLib.h>
  17 #include <Library/ArmGicLib.h>
  18 #include <Library/PcdLib.h>
  19
  20 UINTN
  21 EFIAPI
  22 ArmGicGetMaxNumInterrupts (
  23   IN  INTN          GicDistributorBase
  24   )
  25 {
  26   return 32 * ((MmioRead32 (GicDistributorBase + ARM_GIC_ICDICTR) & 0x1F) + 1);
  27 }
  28
  29 VOID
  30 EFIAPI
  31 ArmGicSendSgiTo (
  32   IN  INTN          GicDistributorBase,
  33   IN  INTN          TargetListFilter,
  34   IN  INTN          CPUTargetList,
  35   IN  INTN          SgiId
  36   )
  37 {
  38   MmioWrite32 (GicDistributorBase + ARM_GIC_ICDSGIR, ((TargetListFilter & 0x3) << 24) | ((CPUTargetList & 0xFF) << 16) | SgiId);
  39 }
  40
  41 RETURN_STATUS
  42 EFIAPI
  43 ArmGicAcknowledgeInterrupt (
  44   IN  UINTN          GicDistributorBase,
  45   IN  UINTN          GicInterruptInterfaceBase,
  46   OUT UINTN          *CoreId,
  47   OUT UINTN          *InterruptId
  48   )
  49 {
  50   UINT32            Interrupt;
  51
  52   // Read the Interrupt Acknowledge Register
  53   Interrupt = MmioRead32 (GicInterruptInterfaceBase + ARM_GIC_ICCIAR);
  54
  55   // Check if it is a valid interrupt ID
  56   if ((Interrupt & 0x3FF) < ArmGicGetMaxNumInterrupts (GicDistributorBase)) {
  57     // Got a valid SGI number hence signal End of Interrupt by writing to ICCEOIR
  58     MmioWrite32 (GicInterruptInterfaceBase + ARM_GIC_ICCEIOR, Interrupt);
  59
  60     if (CoreId) {
  61       *CoreId = (Interrupt >> 10) & 0x7;
  62     }
  63     if (InterruptId) {
  64       *InterruptId = Interrupt & 0x3FF;
  65     }
  66     return RETURN_SUCCESS;
  67   } else {
  68     return RETURN_INVALID_PARAMETER;
  69   }
  70 }