HIFIVE1-VP/platform/incl/sysc/SiFive/uart.h

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/*******************************************************************************
* Copyright (C) 2017, 2018 MINRES Technologies GmbH
* All rights reserved.
*
* 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.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 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.
*
* 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
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*******************************************************************************/
#ifndef _UART_H_
#define _UART_H_
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#include "cci_configuration"
#include "scc/signal_initiator_mixin.h"
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#include "scc/signal_target_mixin.h"
#include "scc/tlm_target.h"
#include <tlm/tlm_signal.h>
namespace sysc {
class tlm_signal_uart_extension;
class uart_regs;
class WsHandler;
class uart : public sc_core::sc_module, public scc::tlm_target<> {
public:
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SC_HAS_PROCESS(uart);// NOLINT
sc_core::sc_in<sc_core::sc_time> clk_i;
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sc_core::sc_in<bool> rst_i;
scc::tlm_signal_bool_out tx_o;
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scc::tlm_signal_bool_in rx_i;
sc_core::sc_out<bool> irq_o;
cci::cci_param<bool> bit_true_transfer;
uart(sc_core::sc_module_name nm);
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virtual ~uart() override;
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protected:
void clock_cb();
void reset_cb();
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void transmit_data();
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void receive_data(tlm::tlm_signal_gp<> &gp, sc_core::sc_time &delay);
void update_irq();
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sc_core::sc_time clk{sc_core::SC_ZERO_TIME}, rx_last_start{sc_core::SC_ZERO_TIME};
std::unique_ptr<uart_regs> regs;
sc_core::sc_fifo<uint8_t> rx_fifo, tx_fifo;
};
} /* namespace sysc */
#endif /* _UART_H_ */