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/*
* Copyright (c) 2013 ARM Limited
* Copyright (c) 2013 Cornell University
* 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
* Christopher Torng
*/
#include "debug/ClockDomain.hh"
#include "params/ClockDomain.hh"
#include "params/DerivedClockDomain.hh"
#include "params/SrcClockDomain.hh"
#include "sim/clock_domain.hh"
#include "sim/voltage_domain.hh"
#include "sim/clocked_object.hh"
void
ClockDomain::regStats()
{
using namespace Stats;
// Expose the current clock period as a stat for observability in
// the dumps
currentClock
.scalar(_clockPeriod)
.name(params()->name + ".clock")
.desc("Clock period in ticks")
;
}
double
ClockDomain::voltage() const
{
return _voltageDomain->voltage();
}
SrcClockDomain::SrcClockDomain(const Params *p) :
ClockDomain(p, p->voltage_domain)
{
clockPeriod(p->clock);
}
void
SrcClockDomain::clockPeriod(Tick clock_period)
{
if (clock_period == 0) {
fatal("%s has a clock period of zero\n", name());
}
// Align all members to the current tick
for (auto m = members.begin(); m != members.end(); ++m) {
(*m)->updateClockPeriod();
}
_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, p->clk_domain->voltageDomain()),
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()
{
// Align all members to the current tick
for (auto m = members.begin(); m != members.end(); ++m) {
(*m)->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);
}
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