| /* |
| * Copyright (c) 2013 ARM Limited |
| * All rights reserved |
| * |
| * The license below extends only to copyright in the software and shall |
| * not be construed as granting a license to any other intellectual |
| * property including but not limited to intellectual property relating |
| * to a hardware implementation of the functionality of the software |
| * licensed hereunder. You may use the software subject to the license |
| * terms below provided that you ensure that this notice is replicated |
| * unmodified and in its entirety in all distributions of the software, |
| * modified or unmodified, in source code or in binary form. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer; |
| * 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; |
| * neither the name of the copyright holders 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 |
| * OWNER 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. |
| * |
| * Authors: Vasileios Spiliopoulos |
| * Akash Bagdia |
| * Andreas Hansson |
| */ |
| |
| #include "debug/ClockDomain.hh" |
| #include "params/ClockDomain.hh" |
| #include "params/DerivedClockDomain.hh" |
| #include "params/SrcClockDomain.hh" |
| #include "sim/clock_domain.hh" |
| |
| SrcClockDomain::SrcClockDomain(const Params *p) : ClockDomain(p) |
| { |
| clockPeriod(p->clock); |
| } |
| |
| void |
| SrcClockDomain::clockPeriod(Tick clock_period) |
| { |
| if (clock_period == 0) { |
| fatal("%s has a clock period of zero\n", name()); |
| } |
| |
| _clockPeriod = clock_period; |
| |
| DPRINTF(ClockDomain, |
| "Setting clock period to %d ticks for source clock %s\n", |
| _clockPeriod, name()); |
| |
| // inform any derived clocks they need to updated their period |
| for (auto c = children.begin(); c != children.end(); ++c) { |
| (*c)->updateClockPeriod(); |
| } |
| } |
| |
| SrcClockDomain * |
| SrcClockDomainParams::create() |
| { |
| return new SrcClockDomain(this); |
| } |
| |
| DerivedClockDomain::DerivedClockDomain(const Params *p) : |
| ClockDomain(p), |
| parent(*p->clk_domain), |
| clockDivider(p->clk_divider) |
| { |
| // Ensure that clock divider setting works as frequency divider and never |
| // work as frequency multiplier |
| if (clockDivider < 1) { |
| fatal("Clock divider param cannot be less than 1"); |
| } |
| |
| // let the parent keep track of this derived domain so that it can |
| // propagate changes |
| parent.addDerivedDomain(this); |
| |
| // update our clock period based on the parents clock |
| updateClockPeriod(); |
| } |
| |
| void |
| DerivedClockDomain::updateClockPeriod() |
| { |
| // recalculate the clock period, relying on the fact that changes |
| // propagate downwards in the tree |
| _clockPeriod = parent.clockPeriod() * clockDivider; |
| |
| DPRINTF(ClockDomain, |
| "Setting clock period to %d ticks for derived clock %s\n", |
| _clockPeriod, name()); |
| |
| // inform any derived clocks |
| for (auto c = children.begin(); c != children.end(); ++c) { |
| (*c)->updateClockPeriod(); |
| } |
| } |
| |
| DerivedClockDomain * |
| DerivedClockDomainParams::create() |
| { |
| return new DerivedClockDomain(this); |
| } |