////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2017, 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.
//
// Contributors:
//       eyck@minres.com - initial implementation
//
//
////////////////////////////////////////////////////////////////////////////////

#include "sysc/SiFive/prci.h"

#include "scc/utilities.h"
#include "sysc/SiFive/gen/prci_regs.h"

namespace sysc {

prci::prci(sc_core::sc_module_name nm)
: sc_core::sc_module(nm)
, tlm_target<>(hfclk)
, NAMED(rst_i)
, NAMED(hfclk_o)
, NAMEDD(prci_regs, regs) {
    regs->registerResources(*this);
    SC_METHOD(reset_cb);
    sensitive << rst_i;
    dont_initialize();
    SC_METHOD(hfxosc_cb);
    sensitive << hfxosc_i;
    SC_METHOD(hfrosc_en_cb);
    sensitive << hfrosc_en_evt;
    dont_initialize();

    regs->hfxosccfg.set_write_cb([this](scc::sc_register<uint32_t> &reg, uint32_t data) -> bool {
        reg.put(data);
        if (this->regs->r_hfxosccfg.hfxoscen==1) { // check rosc_en
            this->hfxosc_en_evt.notify(1, sc_core::SC_US);
        } else {
            this->hfxosc_en_evt.notify(SC_ZERO_TIME);
        }
        return true;
    });
    regs->hfrosccfg.set_write_cb([this](scc::sc_register<uint32_t> &reg, uint32_t data) -> bool {
        reg.put(data);
        if (this->regs->r_hfrosccfg.hfroscen==1) { // check rosc_en
            this->hfrosc_en_evt.notify(1, sc_core::SC_US);
        } else {
            this->hfrosc_en_evt.notify(SC_ZERO_TIME);
        }
        return true;
    });
    regs->pllcfg.set_write_cb([this](scc::sc_register<uint32_t> &reg, uint32_t data) -> bool {
        reg.put(data);
        auto &pllcfg = this->regs->r_pllcfg;
        if (pllcfg.pllbypass == 0 && pllcfg.pllq != 0) { // set pll_lock if pll is selected
            pllcfg.plllock = 1;
        }
        update_hfclk();
        return true;
    });
    regs->plloutdiv.set_write_cb([this](scc::sc_register<uint32_t> &reg, uint32_t data) -> bool {
        reg.put(data);
        update_hfclk();
        return true;
    });
    hfxosc_clk=62.5_ns;
}

prci::~prci() {}

void prci::reset_cb() {
    if (rst_i.read())
        regs->reset_start();
    else {
        regs->reset_stop();
        this->hfxosc_en_evt.notify(1, sc_core::SC_US);
    }
}

void prci::hfxosc_cb() {
    this->regs->r_hfxosccfg.hfxoscrdy=0;
    this->hfxosc_en_evt.notify(1, sc_core::SC_US);

}

void prci::hfxosc_en_cb() {
    update_hfclk();
    if(regs->r_hfxosccfg.hfxoscen==1)// set rosc_rdy
        regs->r_hfxosccfg.hfxoscrdy =1;
    else
        regs->r_hfxosccfg.hfxoscrdy =0;
}

void prci::hfrosc_en_cb() {
    update_hfclk();
    auto& hfrosccfg=regs->r_hfrosccfg;
    if(regs->r_hfrosccfg.hfroscen==1) {// set rosc_rdy
        regs->r_hfrosccfg.hfroscrdy =1;
    } else {
        regs->r_hfrosccfg.hfroscrdy =0;
    }
}

void prci::update_hfclk() {
    auto& hfrosccfg=regs->r_hfrosccfg;
    auto& pllcfg=regs->r_pllcfg;
    auto& plldiv=regs->r_plloutdiv;
    hfrosc_clk = sc_core::sc_time(((hfrosccfg.hfroscdiv+1)*1.0)/(1125000.0*(hfrosccfg.hfrosctrim+1)), sc_core::SC_SEC);
    auto pll_ref = pllcfg.pllrefsel==1?hfxosc_clk:hfrosc_clk;
    auto r = pllcfg.pllr+1;
    auto f = 2*(pllcfg.pllf+1);
    auto q = 1<<pllcfg.pllq;
    auto pll_out = pllcfg.pllbypass==1 || pllcfg.plllock==0?pll_ref:((pll_ref*r)/f)*q;
    auto pll_res = plldiv&0x100?pll_out:2*pll_out*((plldiv&0x3f)+1);
    hfclk = pllcfg.pllsel?pll_res:hfrosc_clk;
    hfclk_o.write(hfclk);
}

} /* namespace sysc */