101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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// Copyright 2017 eyck@minres.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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////////////////////////////////////////////////////////////////////////////////
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#include "sysc/SiFive/clint.h"
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#include "scc/utilities.h"
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#include "scc/report.h"
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#include "sysc/SiFive/gen/clint_regs.h"
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namespace sysc {
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const int lfclk_mutiplier = 1 << 12;
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clint::clint(sc_core::sc_module_name nm)
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: sc_core::sc_module(nm)
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, tlm_target<>(clk)
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, NAMED(clk_i)
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, NAMED(rst_i)
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, NAMED(mtime_int_o)
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, NAMED(msip_int_o)
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, NAMEDD(clint_regs, regs)
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, cnt_fraction(0) {
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regs->registerResources(*this);
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SC_METHOD(clock_cb);
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sensitive << clk_i;
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SC_METHOD(reset_cb);
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sensitive << rst_i;
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dont_initialize();
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regs->mtimecmp.set_write_cb([this](scc::sc_register<uint64_t> ®, uint64_t data) -> bool {
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if (!regs->in_reset()) {
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reg.put(data);
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this->update_mtime();
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}
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return true;
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});
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regs->mtime.set_read_cb([this](const scc::sc_register<uint64_t> ®, uint64_t &data) -> bool {
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this->update_mtime();
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data = reg.get();
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return true;
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});
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regs->mtime.set_write_cb([this](scc::sc_register<uint64_t> ®, uint64_t data) -> bool { return false; });
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regs->msip.set_write_cb([this](scc::sc_register<uint32_t> ®, uint32_t data) -> bool {
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reg.put(data);
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msip_int_o.write(regs->r_msip.msip);
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return true;
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});
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SC_METHOD(update_mtime);
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sensitive << mtime_evt;
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dont_initialize();
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}
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void clint::clock_cb() {
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update_mtime();
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this->clk = clk_i.read();
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update_mtime();
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}
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clint::~clint() {}
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void clint::reset_cb() {
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if (rst_i.read()) {
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regs->reset_start();
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msip_int_o.write(false);
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mtime_int_o.write(false);
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cnt_fraction = 0;
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} else
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regs->reset_stop();
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}
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void clint::update_mtime() {
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auto diff = (sc_core::sc_time_stamp() - last_updt) / clk;
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auto diffi = (int)diff;
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regs->r_mtime += (diffi + cnt_fraction) / lfclk_mutiplier;
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cnt_fraction = (cnt_fraction + diffi) % lfclk_mutiplier;
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mtime_evt.cancel();
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if (regs->r_mtimecmp > 0)
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if(regs->r_mtimecmp > regs->r_mtime && clk > sc_core::SC_ZERO_TIME) {
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sc_core::sc_time next_trigger = (clk * lfclk_mutiplier) * (regs->r_mtimecmp - regs->mtime) - cnt_fraction * clk;
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LOG(DEBUG)<<"Timer fires at "<< sc_time_stamp()+next_trigger;
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mtime_evt.notify(next_trigger);
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mtime_int_o.write(false);
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} else
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mtime_int_o.write(true);
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last_updt = sc_core::sc_time_stamp();
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}
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} /* namespace sysc */
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