watchdog_sp805.hh

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/*
 * Copyright (c) 2020 ARM Limited
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 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Adrian Herrera
 */

#ifndef __DEV_ARM_WATCHDOG_SP805_HH__
#define __DEV_ARM_WATCHDOG_SP805_HH__

#include "dev/arm/amba_device.hh"

class Sp805Params;

class Sp805 : public AmbaIntDevice
{
  public:
    Sp805(Sp805Params const* params);

    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;

  protected:
    Tick read(PacketPtr pkt) override;
    Tick write(PacketPtr pkt) override;

  private:
    enum Offset : Addr {
        WDOGLOAD      = 0x000,
        WDOGVALUE     = 0x004,
        WDOGCONTROL   = 0x008,
        WDOGINTCLR    = 0x00c,
        WDOGRIS       = 0x010,
        WDOGMIS       = 0x014,
        // 0x018 - 0xbfc -> Reserved
        WDOGLOCK      = 0xc00,
        // 0xc04 - 0xefc -> Reserved
        WDOGITCR      = 0xf00,
        WDOGITOP      = 0xf04,
        // 0xf08 - 0xfdc -> Reserved
        // 0xfe0 - 0xfff -> CoreSight / Peripheral ID (AMBA ID)
    };

    uint32_t timeoutInterval;

    Tick timeoutStartTick;

    uint32_t persistedValue;

    bool enabled;

    bool resetEnabled;

    bool intRaised;

    bool writeAccessEnabled;

    bool integrationTestEnabled;

    EventFunctionWrapper timeoutEvent;

    uint32_t value(void) const;

    void timeoutExpired(void);

    void restartCounter(void);

    void stopCounter(void);

    void sendInt(void);

    void clearInt(void);

    static constexpr uint32_t WDOGLOCK_MAGIC = 0x1acce551;
};

#endif // __DEV_ARM_WATCHDOG_SP805_HH__