1/*
2 * Copyright (c) 2013 ARM Limited
3 * Copyright (c) 2013 Cornell University
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

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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
41 * Christopher Torng
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"
50#include "sim/clocked_object.hh"
51
52double
53ClockDomain::voltage() const
54{
55 return _voltageDomain->voltage();
56}
57
58SrcClockDomain::SrcClockDomain(const Params *p) :

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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
71 // Align all members to the current tick
72 for (auto m = members.begin(); m != members.end(); ++m) {
73 (*m)->updateClockPeriod();
74 }
75
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) {

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108
109 // update our clock period based on the parents clock
110 updateClockPeriod();
111}
112
113void
114DerivedClockDomain::updateClockPeriod()
115{
116 // Align all members to the current tick
117 for (auto m = members.begin(); m != members.end(); ++m) {
118 (*m)->updateClockPeriod();
119 }
120
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}