mhu.hh

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/*
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
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#ifndef __DEV_ARM_CSS_MHU_H__
#define __DEV_ARM_CSS_MHU_H__
 
#include "dev/arm/doorbell.hh"
#include "dev/io_device.hh"
 
namespace gem5
{
 
struct Ap2ScpDoorbellParams;
class ArmInterruptPin;
class MHU;
struct MHUParams;
class Scp;
struct Scp2ApDoorbellParams;
 
class MhuDoorbell : public Doorbell
{
  public:
    friend class MHU;
 
    MhuDoorbell(const DoorbellParams &p)
      : Doorbell(p), channel(0)
    {}
 
    void set(uint32_t val) { update(channel | val); }
    void clear(uint32_t val) { update(channel & ~val); }
 
  protected:
    void update(uint32_t new_val);
 
    virtual void raiseInterrupt() = 0;
    virtual void clearInterrupt() = 0;
 
    uint32_t channel;
};
 
class Scp2ApDoorbell : public MhuDoorbell
{
  public:
    Scp2ApDoorbell(const Scp2ApDoorbellParams &p);
 
    void raiseInterrupt() override;
    void clearInterrupt() override;
 
  private:
    ArmInterruptPin *interrupt;
};
 
class Ap2ScpDoorbell : public MhuDoorbell
{
  public:
    Ap2ScpDoorbell(const Ap2ScpDoorbellParams &p);
 
    void setScp(Scp *_scp) { scp = _scp; }
 
    void raiseInterrupt() override;
    void clearInterrupt() override;
 
  private:
    Scp *scp;
};

class MHU : public BasicPioDevice
{
  public:
    enum
    {
        SCP_INTR_L_STAT = 0x0,
        SCP_INTR_L_SET = 0x8,
        SCP_INTR_L_CLEAR = 0x10,
        SCP_INTR_H_STAT = 0x20,
        SCP_INTR_H_SET = 0x28,
        SCP_INTR_H_CLEAR = 0x30,

        CPU_INTR_L_STAT = 0x100,
        CPU_INTR_L_SET = 0x108,
        CPU_INTR_L_CLEAR = 0x110,
        CPU_INTR_H_STAT = 0x120,
        CPU_INTR_H_SET = 0x128,
        CPU_INTR_H_CLEAR = 0x130,
 
        SCP_INTR_S_STAT = 0x200,
        SCP_INTR_S_SET = 0x208,
        SCP_INTR_S_CLEAR = 0x210,
        CPU_INTR_S_STAT = 0x300,
        CPU_INTR_S_SET = 0x308,
        CPU_INTR_S_CLEAR = 0x310,
 
        MHU_SCFG = 0x400,
 
        PID4 = 0xfd0,
        PID0 = 0xfe0,
        PID1 = 0xfe4,
        PID2 = 0xfe8,
        PID3 = 0xfec,
 
        COMPID0 = 0xff0,
        COMPID1 = 0xff4,
        COMPID2 = 0xff8,
        COMPID3 = 0xffc
    };
 
    // Secure Violation Interrupt: used when accessing
    // a secure channel in non secure mode
    static const uint32_t SVI_INT = 0x80000000;
 
    MHU(const MHUParams &p);
 
    AddrRangeList getAddrRanges() const override;
 
    Tick read(PacketPtr pkt) override;
    Tick write(PacketPtr pkt) override;
 
    uint32_t read32(const Addr addr, bool secure_access);
 
    Scp2ApDoorbell *scpLow;
    Scp2ApDoorbell *scpHigh;
    Scp2ApDoorbell *scpSec;
 
    Ap2ScpDoorbell *apLow;
    Ap2ScpDoorbell *apHigh;
    Ap2ScpDoorbell *apSec;
 
    // MHU.PIDn, MHU.COMPIDn registers
    uint32_t pid[5];
    uint32_t compid[4];
 
    uint32_t scfg;
};
 
} // namespace gem5
 
#endif // __DEV_ARM_CSS_MHU_H__