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

/*******************************************************************************
 * Copyright 2017 eyck@minres.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/

#ifndef _GPIO_H_
#define _GPIO_H_

#include "scc/tlm_target.h"
#include "scc/ext_attribute.h"
#include <sysc/communication/sc_signal_rv_ports.h>

namespace sysc {

class gpio_regs;
class WsHandler;

class gpio : public sc_core::sc_module, public scc::tlm_target<> {
public:
    SC_HAS_PROCESS(gpio);
    sc_core::sc_in<sc_core::sc_time> clk_i;
    sc_core::sc_in<bool> rst_i;
    sc_core::sc_inout_rv<32> pins_io;

    gpio(sc_core::sc_module_name nm);
    virtual ~gpio() override; // need to keep it in source file because of fwd declaration of gpio_regs

    scc::ext_attribute<bool> write_to_ws;
protected:
    void clock_cb();
    void reset_cb();
    void update_pins();
    void pins_cb();
    void before_end_of_elaboration();
    sc_core::sc_time clk;
    std::unique_ptr<gpio_regs> regs;
    std::shared_ptr<sysc::WsHandler> handler;

private:
	void update_value_reg();
};

} /* namespace sysc */

#endif /* _GPIO_H_ */