HIFIVE1-VP/riscv.sc/incl/sysc/SiFive/clint.h

////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017, MINRES Technologies GmbH
// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
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// 3. Neither the name of the copyright holder nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// POSSIBILITY OF SUCH DAMAGE.
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// Contributors:
//       eyck@minres.com - initial implementation
//
//
////////////////////////////////////////////////////////////////////////////////

#ifndef _CLINT_H_
#define _CLINT_H_

#include "scc/tlm_target.h"

namespace iss {
namespace arch {
template <typename BASE> class riscv_hart_msu_vp;
}
}

namespace sysc {

class clint_regs;
namespace SiFive {
class core_complex;
}

class clint : public sc_core::sc_module, public scc::tlm_target<> {
public:
    SC_HAS_PROCESS(clint);
    sc_core::sc_in<sc_core::sc_time> tlclk_i;
    sc_core::sc_in<sc_core::sc_time> lfclk_i;
    sc_core::sc_in<bool> rst_i;
    sc_core::sc_out<bool> mtime_int_o;
    sc_core::sc_out<bool> msip_int_o;
    clint(sc_core::sc_module_name nm);
    virtual ~clint() override; // need to keep it in source file because of fwd declaration of clint_regs

protected:
    void clock_cb();
    void reset_cb();
    void update_mtime();
    sc_core::sc_time clk, last_updt;
    unsigned cnt_fraction;
    std::unique_ptr<clint_regs> regs;
    sc_core::sc_event mtime_evt;
};

} /* namespace sysc */

#endif /* _CLINT_H_ */