rtc_pl031.hh

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/*
 * Copyright (c) 2010-2012 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
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 * redistributions in binary form must reproduce the above copyright
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 * this software without specific prior written permission.
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#ifndef __DEV_ARM_RTC_PL310_HH__
#define __DEV_ARM_RTC_PL310_HH__
 
#include "dev/arm/amba_device.hh"

 
namespace gem5
{
 
struct PL031Params;
 
class PL031 : public AmbaIntDevice
{
  protected:
    enum
    {
        DataReg    = 0x00,
        MatchReg   = 0x04,
        LoadReg    = 0x08,
        ControlReg = 0x0C,
        IntMask    = 0x10,
        RawISR     = 0x14,
        MaskedISR  = 0x18,
        IntClear   = 0x1C,
    };
 
    /* Seconds since epoch that correspond to time simulation was started at the
     * begining of simulation and is then updated if ever written. */
    uint32_t timeVal;
 
    /* Time when the timeVal register was written */
    Tick lastWrittenTick;
 
    /* Previous load value */
    uint32_t loadVal;
 
    /* RTC Match Value
     * Cause an interrupt when this value hits counter
     */
    uint32_t matchVal;

    bool rawInt;

    bool maskInt;

    bool pendingInt;

    void counterMatch();
    EventFunctionWrapper matchEvent;

    void resyncMatch();
 
  public:
    using Params = PL031Params;

    PL031(const Params &p);

    Tick read(PacketPtr pkt) override;

    Tick write(PacketPtr pkt) override;
 
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
};
 
} // namespace gem5
 
#endif // __DEV_ARM_RTC_PL031_HH__