/** @file
*
*  Copyright (c) 2011-2021, Arm Limited. All rights reserved.<BR>
*
*  SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/

#ifndef ARMGIC_H_
#define ARMGIC_H_

#include <Library/ArmGicArchLib.h>

// GIC Distributor
#define ARM_GIC_ICDDCR          0x000 // Distributor Control Register
#define ARM_GIC_ICDICTR         0x004 // Interrupt Controller Type Register
#define ARM_GIC_ICDIIDR         0x008 // Implementer Identification Register

// Each reg base below repeats for Number of interrupts / 4 (see GIC spec)
#define ARM_GIC_ICDISR          0x080 // Interrupt Security Registers
#define ARM_GIC_ICDISER         0x100 // Interrupt Set-Enable Registers
#define ARM_GIC_ICDICER         0x180 // Interrupt Clear-Enable Registers
#define ARM_GIC_ICDSPR          0x200 // Interrupt Set-Pending Registers
#define ARM_GIC_ICDICPR         0x280 // Interrupt Clear-Pending Registers
#define ARM_GIC_ICDABR          0x300 // Active Bit Registers

// Each reg base below repeats for Number of interrupts / 4
#define ARM_GIC_ICDIPR          0x400 // Interrupt Priority Registers

// Each reg base below repeats for Number of interrupts
#define ARM_GIC_ICDIPTR         0x800 // Interrupt Processor Target Registers
#define ARM_GIC_ICDICFR         0xC00 // Interrupt Configuration Registers

#define ARM_GIC_ICDPPISR        0xD00 // PPI Status register

// just one of these
#define ARM_GIC_ICDSGIR         0xF00 // Software Generated Interrupt Register

// GICv3 specific registers
#define ARM_GICD_IROUTER        0x6100 // Interrupt Routing Registers

// GICD_CTLR bits
#define ARM_GIC_ICDDCR_ARE      (1 << 4) // Affinity Routing Enable (ARE)
#define ARM_GIC_ICDDCR_DS       (1 << 6) // Disable Security (DS)

// GICD_ICDICFR bits
#define ARM_GIC_ICDICFR_WIDTH            32   // ICDICFR is a 32 bit register
#define ARM_GIC_ICDICFR_BYTES            (ARM_GIC_ICDICFR_WIDTH / 8)
#define ARM_GIC_ICDICFR_F_WIDTH          2    // Each F field is 2 bits
#define ARM_GIC_ICDICFR_F_STRIDE         16   // (32/2) F fields per register
#define ARM_GIC_ICDICFR_F_CONFIG1_BIT    1    // Bit number within F field
#define ARM_GIC_ICDICFR_LEVEL_TRIGGERED  0x0  // Level triggered interrupt
#define ARM_GIC_ICDICFR_EDGE_TRIGGERED   0x1  // Edge triggered interrupt


// GIC Redistributor
#define ARM_GICR_CTLR_FRAME_SIZE         SIZE_64KB
#define ARM_GICR_SGI_PPI_FRAME_SIZE      SIZE_64KB
#define ARM_GICR_SGI_VLPI_FRAME_SIZE     SIZE_64KB
#define ARM_GICR_SGI_RESERVED_FRAME_SIZE SIZE_64KB

// GIC Redistributor Control frame
#define ARM_GICR_TYPER          0x0008  // Redistributor Type Register

// GIC Redistributor TYPER bit assignments
#define ARM_GICR_TYPER_PLPIS        (1 << 0)              // Physical LPIs
#define ARM_GICR_TYPER_VLPIS        (1 << 1)              // Virtual LPIs
#define ARM_GICR_TYPER_DIRECTLPI    (1 << 3)              // Direct LPIs
#define ARM_GICR_TYPER_LAST         (1 << 4)              // Last Redistributor in series
#define ARM_GICR_TYPER_DPGS         (1 << 5)              // Disable Processor Group
                                                          // Selection Support
#define ARM_GICR_TYPER_PROCNO       (0xFFFF << 8)         // Processor Number
#define ARM_GICR_TYPER_COMMONLPIAFF (0x3 << 24)           // Common LPI Affinity
#define ARM_GICR_TYPER_AFFINITY     (0xFFFFFFFFULL << 32) // Redistributor Affinity

#define ARM_GICR_TYPER_GET_AFFINITY(TypeReg)  (((TypeReg) & \
                                                ARM_GICR_TYPER_AFFINITY) >> 32)

// GIC SGI & PPI Redistributor frame
#define ARM_GICR_ISENABLER      0x0100  // Interrupt Set-Enable Registers
#define ARM_GICR_ICENABLER      0x0180  // Interrupt Clear-Enable Registers

// GIC Cpu interface
#define ARM_GIC_ICCICR          0x00  // CPU Interface Control Register
#define ARM_GIC_ICCPMR          0x04  // Interrupt Priority Mask Register
#define ARM_GIC_ICCBPR          0x08  // Binary Point Register
#define ARM_GIC_ICCIAR          0x0C  // Interrupt Acknowledge Register
#define ARM_GIC_ICCEIOR         0x10  // End Of Interrupt Register
#define ARM_GIC_ICCRPR          0x14  // Running Priority Register
#define ARM_GIC_ICCPIR          0x18  // Highest Pending Interrupt Register
#define ARM_GIC_ICCABPR         0x1C  // Aliased Binary Point Register
#define ARM_GIC_ICCIIDR         0xFC  // Identification Register

#define ARM_GIC_ICDSGIR_FILTER_TARGETLIST       0x0
#define ARM_GIC_ICDSGIR_FILTER_EVERYONEELSE     0x1
#define ARM_GIC_ICDSGIR_FILTER_ITSELF           0x2

// Bit-masks to configure the CPU Interface Control register
#define ARM_GIC_ICCICR_ENABLE_SECURE            0x01
#define ARM_GIC_ICCICR_ENABLE_NS                0x02
#define ARM_GIC_ICCICR_ACK_CTL                  0x04
#define ARM_GIC_ICCICR_SIGNAL_SECURE_TO_FIQ     0x08
#define ARM_GIC_ICCICR_USE_SBPR                 0x10

// Bit Mask for GICC_IIDR
#define ARM_GIC_ICCIIDR_GET_PRODUCT_ID(IccIidr)   (((IccIidr) >> 20) & 0xFFF)
#define ARM_GIC_ICCIIDR_GET_ARCH_VERSION(IccIidr) (((IccIidr) >> 16) & 0xF)
#define ARM_GIC_ICCIIDR_GET_REVISION(IccIidr)     (((IccIidr) >> 12) & 0xF)
#define ARM_GIC_ICCIIDR_GET_IMPLEMENTER(IccIidr)  ((IccIidr) & 0xFFF)

// Bit Mask for
#define ARM_GIC_ICCIAR_ACKINTID                 0x3FF

UINTN
EFIAPI
ArmGicGetInterfaceIdentification (
  IN  INTN          GicInterruptInterfaceBase
  );

// GIC Secure interfaces
VOID
EFIAPI
ArmGicSetupNonSecure (
  IN  UINTN         MpId,
  IN  INTN          GicDistributorBase,
  IN  INTN          GicInterruptInterfaceBase
  );

VOID
EFIAPI
ArmGicSetSecureInterrupts (
  IN  UINTN         GicDistributorBase,
  IN  UINTN*        GicSecureInterruptMask,
  IN  UINTN         GicSecureInterruptMaskSize
  );

VOID
EFIAPI
ArmGicEnableInterruptInterface (
  IN  INTN          GicInterruptInterfaceBase
  );

VOID
EFIAPI
ArmGicDisableInterruptInterface (
  IN  INTN          GicInterruptInterfaceBase
  );

VOID
EFIAPI
ArmGicEnableDistributor (
  IN  INTN          GicDistributorBase
  );

VOID
EFIAPI
ArmGicDisableDistributor (
  IN  INTN          GicDistributorBase
  );

UINTN
EFIAPI
ArmGicGetMaxNumInterrupts (
  IN  INTN          GicDistributorBase
  );

VOID
EFIAPI
ArmGicSendSgiTo (
  IN  INTN          GicDistributorBase,
  IN  INTN          TargetListFilter,
  IN  INTN          CPUTargetList,
  IN  INTN          SgiId
  );

/*
 * Acknowledge and return the value of the Interrupt Acknowledge Register
 *
 * InterruptId is returned separately from the register value because in
 * the GICv2 the register value contains the CpuId and InterruptId while
 * in the GICv3 the register value is only the InterruptId.
 *
 * @param GicInterruptInterfaceBase   Base Address of the GIC CPU Interface
 * @param InterruptId                 InterruptId read from the Interrupt
 *                                    Acknowledge Register
 *
 * @retval value returned by the Interrupt Acknowledge Register
 *
 */
UINTN
EFIAPI
ArmGicAcknowledgeInterrupt (
  IN  UINTN          GicInterruptInterfaceBase,
  OUT UINTN          *InterruptId
  );

VOID
EFIAPI
ArmGicEndOfInterrupt (
  IN  UINTN                 GicInterruptInterfaceBase,
  IN UINTN                  Source
  );

UINTN
EFIAPI
ArmGicSetPriorityMask (
  IN  INTN          GicInterruptInterfaceBase,
  IN  INTN          PriorityMask
  );

VOID
EFIAPI
ArmGicSetInterruptPriority (
  IN UINTN                  GicDistributorBase,
  IN UINTN                  GicRedistributorBase,
  IN UINTN                  Source,
  IN UINTN                  Priority
  );

VOID
EFIAPI
ArmGicEnableInterrupt (
  IN UINTN                  GicDistributorBase,
  IN UINTN                  GicRedistributorBase,
  IN UINTN                  Source
  );

VOID
EFIAPI
ArmGicDisableInterrupt (
  IN UINTN                  GicDistributorBase,
  IN UINTN                  GicRedistributorBase,
  IN UINTN                  Source
  );

BOOLEAN
EFIAPI
ArmGicIsInterruptEnabled (
  IN UINTN                  GicDistributorBase,
  IN UINTN                  GicRedistributorBase,
  IN UINTN                  Source
  );

// GIC revision 2 specific declarations

// Interrupts from 1020 to 1023 are considered as special interrupts
// (eg: spurious interrupts)
#define ARM_GIC_IS_SPECIAL_INTERRUPTS(Interrupt) \
          (((Interrupt) >= 1020) && ((Interrupt) <= 1023))

VOID
EFIAPI
ArmGicV2SetupNonSecure (
  IN  UINTN         MpId,
  IN  INTN          GicDistributorBase,
  IN  INTN          GicInterruptInterfaceBase
  );

VOID
EFIAPI
ArmGicV2EnableInterruptInterface (
  IN  INTN          GicInterruptInterfaceBase
  );

VOID
EFIAPI
ArmGicV2DisableInterruptInterface (
  IN  INTN          GicInterruptInterfaceBase
  );

UINTN
EFIAPI
ArmGicV2AcknowledgeInterrupt (
  IN  UINTN          GicInterruptInterfaceBase
  );

VOID
EFIAPI
ArmGicV2EndOfInterrupt (
  IN UINTN                  GicInterruptInterfaceBase,
  IN UINTN                  Source
  );

// GIC revision 3 specific declarations

#define ICC_SRE_EL2_SRE         (1 << 0)

#define ARM_GICD_IROUTER_IRM BIT31

UINT32
EFIAPI
ArmGicV3GetControlSystemRegisterEnable (
  VOID
  );

VOID
EFIAPI
ArmGicV3SetControlSystemRegisterEnable (
  IN UINT32         ControlSystemRegisterEnable
  );

VOID
EFIAPI
ArmGicV3EnableInterruptInterface (
  VOID
  );

VOID
EFIAPI
ArmGicV3DisableInterruptInterface (
  VOID
  );

UINTN
EFIAPI
ArmGicV3AcknowledgeInterrupt (
  VOID
  );

VOID
EFIAPI
ArmGicV3EndOfInterrupt (
  IN UINTN                  Source
  );

VOID
ArmGicV3SetBinaryPointer (
  IN UINTN                  BinaryPoint
  );

VOID
ArmGicV3SetPriorityMask (
  IN UINTN                  Priority
  );

#endif // ARMGIC_H_