1/* 2 * Copyright (c) 2013 ARM Limited
| 1/* 2 * Copyright (c) 2013 ARM Limited
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| 3 * Copyright (c) 2013 Cornell University
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3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Vasileios Spiliopoulos 38 * Akash Bagdia 39 * Andreas Hansson
| 4 * All rights reserved 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions are 17 * met: redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer; 19 * redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution; 22 * neither the name of the copyright holders nor the names of its 23 * contributors may be used to endorse or promote products derived from 24 * this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 29 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 30 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 31 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 32 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 36 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 * 38 * Authors: Vasileios Spiliopoulos 39 * Akash Bagdia 40 * Andreas Hansson
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| 41 * Christopher Torng
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40 */ 41 42#include "debug/ClockDomain.hh" 43#include "params/ClockDomain.hh" 44#include "params/DerivedClockDomain.hh" 45#include "params/SrcClockDomain.hh" 46#include "sim/clock_domain.hh" 47#include "sim/voltage_domain.hh"
| 42 */ 43 44#include "debug/ClockDomain.hh" 45#include "params/ClockDomain.hh" 46#include "params/DerivedClockDomain.hh" 47#include "params/SrcClockDomain.hh" 48#include "sim/clock_domain.hh" 49#include "sim/voltage_domain.hh"
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| 50#include "sim/clocked_object.hh"
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48 49double 50ClockDomain::voltage() const 51{ 52 return _voltageDomain->voltage(); 53} 54 55SrcClockDomain::SrcClockDomain(const Params *p) : 56 ClockDomain(p, p->voltage_domain) 57{ 58 clockPeriod(p->clock); 59} 60 61void 62SrcClockDomain::clockPeriod(Tick clock_period) 63{ 64 if (clock_period == 0) { 65 fatal("%s has a clock period of zero\n", name()); 66 } 67
| 51 52double 53ClockDomain::voltage() const 54{ 55 return _voltageDomain->voltage(); 56} 57 58SrcClockDomain::SrcClockDomain(const Params *p) : 59 ClockDomain(p, p->voltage_domain) 60{ 61 clockPeriod(p->clock); 62} 63 64void 65SrcClockDomain::clockPeriod(Tick clock_period) 66{ 67 if (clock_period == 0) { 68 fatal("%s has a clock period of zero\n", name()); 69 } 70
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| 71 // Align all members to the current tick 72 for (auto m = members.begin(); m != members.end(); ++m) { 73 (*m)->updateClockPeriod(); 74 } 75
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68 _clockPeriod = clock_period; 69 70 DPRINTF(ClockDomain, 71 "Setting clock period to %d ticks for source clock %s\n", 72 _clockPeriod, name()); 73 74 // inform any derived clocks they need to updated their period 75 for (auto c = children.begin(); c != children.end(); ++c) { 76 (*c)->updateClockPeriod(); 77 } 78} 79 80SrcClockDomain * 81SrcClockDomainParams::create() 82{ 83 return new SrcClockDomain(this); 84} 85 86DerivedClockDomain::DerivedClockDomain(const Params *p) : 87 ClockDomain(p, p->clk_domain->voltageDomain()), 88 parent(*p->clk_domain), 89 clockDivider(p->clk_divider) 90{ 91 // Ensure that clock divider setting works as frequency divider and never 92 // work as frequency multiplier 93 if (clockDivider < 1) { 94 fatal("Clock divider param cannot be less than 1"); 95 } 96 97 // let the parent keep track of this derived domain so that it can 98 // propagate changes 99 parent.addDerivedDomain(this); 100 101 // update our clock period based on the parents clock 102 updateClockPeriod(); 103} 104 105void 106DerivedClockDomain::updateClockPeriod() 107{
| 76 _clockPeriod = clock_period; 77 78 DPRINTF(ClockDomain, 79 "Setting clock period to %d ticks for source clock %s\n", 80 _clockPeriod, name()); 81 82 // inform any derived clocks they need to updated their period 83 for (auto c = children.begin(); c != children.end(); ++c) { 84 (*c)->updateClockPeriod(); 85 } 86} 87 88SrcClockDomain * 89SrcClockDomainParams::create() 90{ 91 return new SrcClockDomain(this); 92} 93 94DerivedClockDomain::DerivedClockDomain(const Params *p) : 95 ClockDomain(p, p->clk_domain->voltageDomain()), 96 parent(*p->clk_domain), 97 clockDivider(p->clk_divider) 98{ 99 // Ensure that clock divider setting works as frequency divider and never 100 // work as frequency multiplier 101 if (clockDivider < 1) { 102 fatal("Clock divider param cannot be less than 1"); 103 } 104 105 // let the parent keep track of this derived domain so that it can 106 // propagate changes 107 parent.addDerivedDomain(this); 108 109 // update our clock period based on the parents clock 110 updateClockPeriod(); 111} 112 113void 114DerivedClockDomain::updateClockPeriod() 115{
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| 116 // Align all members to the current tick 117 for (auto m = members.begin(); m != members.end(); ++m) { 118 (*m)->updateClockPeriod(); 119 } 120
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108 // recalculate the clock period, relying on the fact that changes 109 // propagate downwards in the tree 110 _clockPeriod = parent.clockPeriod() * clockDivider; 111 112 DPRINTF(ClockDomain, 113 "Setting clock period to %d ticks for derived clock %s\n", 114 _clockPeriod, name()); 115 116 // inform any derived clocks 117 for (auto c = children.begin(); c != children.end(); ++c) { 118 (*c)->updateClockPeriod(); 119 } 120} 121 122DerivedClockDomain * 123DerivedClockDomainParams::create() 124{ 125 return new DerivedClockDomain(this); 126}
| 121 // recalculate the clock period, relying on the fact that changes 122 // propagate downwards in the tree 123 _clockPeriod = parent.clockPeriod() * clockDivider; 124 125 DPRINTF(ClockDomain, 126 "Setting clock period to %d ticks for derived clock %s\n", 127 _clockPeriod, name()); 128 129 // inform any derived clocks 130 for (auto c = children.begin(); c != children.end(); ++c) { 131 (*c)->updateClockPeriod(); 132 } 133} 134 135DerivedClockDomain * 136DerivedClockDomainParams::create() 137{ 138 return new DerivedClockDomain(this); 139}
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