watchdog_sp805.hh

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/*
 * Copyright (c) 2020 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * 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
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
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#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 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__