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 UINT32
  42 EFIAPI
  43 ArmGicAcknowledgeSgiFrom (
  44   IN  INTN          GicInterruptInterfaceBase,
  45   IN  INTN          CoreId
  46   )
  47 {
  48   INTN            InterruptId;
  49
  50   InterruptId = MmioRead32 (GicInterruptInterfaceBase + ARM_GIC_ICCIAR);
  51
  52   // Check if the Interrupt ID is valid, The read from Interrupt Ack register returns CPU ID and Interrupt ID
  53   if ((((CoreId & 0x7) << 10) | PcdGet32(PcdGicSgiIntId)) == InterruptId) {
  54     // Got SGI number 0 hence signal End of Interrupt by writing to ICCEOIR
  55     MmioWrite32 (GicInterruptInterfaceBase + ARM_GIC_ICCEIOR, InterruptId);
  56     return 1;
  57   } else {
  58     return 0;
  59   }
  60 }
  61
  62 UINT32
  63 EFIAPI
  64 ArmGicAcknowledgeSgi2From (
  65   IN  INTN          GicInterruptInterfaceBase,
  66   IN  INTN          CoreId,
  67   IN  INTN          SgiId
  68   )
  69 {
  70   INTN            InterruptId;
  71
  72   InterruptId = MmioRead32(GicInterruptInterfaceBase + ARM_GIC_ICCIAR);
  73
  74   // Check if the Interrupt ID is valid, The read from Interrupt Ack register returns CPU ID and Interrupt ID
  75   if((((CoreId & 0x7) << 10) | (SgiId & 0x3FF)) == (InterruptId & 0x1FFF)) {
  76     // Got SGI number 0 hence signal End of Interrupt by writing to ICCEOIR
  77     MmioWrite32 (GicInterruptInterfaceBase + ARM_GIC_ICCEIOR, InterruptId);
  78     return 1;
  79   } else {
  80     return 0;
  81   }
  82 }