changeset fa8dcdd7e26c in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=fa8dcdd7e26c
description:
ARM: Add RTC device for ARM platforms.
This change implements a PL031 real time clock.
diffstat:
src/base/time.cc | 21 +++
src/base/time.hh | 2 +
src/dev/arm/SConscript | 1 +
src/dev/arm/rtc_pl031.cc | 251 +++++++++++++++++++++++++++++++++++++++++++++++
src/dev/arm/rtc_pl031.hh | 136 +++++++++++++++++++++++++
src/dev/mc146818.cc | 18 ---
6 files changed, 411 insertions(+), 18 deletions(-)
diffs (truncated from 479 to 300 lines):
diff -r 26dbd171754e -r fa8dcdd7e26c src/base/time.cc
--- a/src/base/time.cc Thu Mar 01 17:26:31 2012 -0600
+++ b/src/base/time.cc Thu Mar 01 17:26:31 2012 -0600
@@ -28,6 +28,8 @@
* Authors: Nathan Binkert
*/
+#include <cstdlib>
+#include <ctime>
#include <iostream>
#include <sstream>
@@ -144,3 +146,22 @@
nanosleep(&ts, NULL);
#endif
}
+
+time_t
+mkutctime(struct tm *time)
+{
+ time_t ret;
+ char *tz;
+
+ tz = getenv("TZ");
+ setenv("TZ", "", 1);
+ tzset();
+ ret = mktime(time);
+ if (tz)
+ setenv("TZ", tz, 1);
+ else
+ unsetenv("TZ");
+ tzset();
+ return ret;
+}
+
diff -r 26dbd171754e -r fa8dcdd7e26c src/base/time.hh
--- a/src/base/time.hh Thu Mar 01 17:26:31 2012 -0600
+++ b/src/base/time.hh Thu Mar 01 17:26:31 2012 -0600
@@ -268,4 +268,6 @@
return out;
}
+time_t mkutctime(struct tm *time);
+
#endif // __BASE_TIME_HH__
diff -r 26dbd171754e -r fa8dcdd7e26c src/dev/arm/SConscript
--- a/src/dev/arm/SConscript Thu Mar 01 17:26:31 2012 -0600
+++ b/src/dev/arm/SConscript Thu Mar 01 17:26:31 2012 -0600
@@ -52,6 +52,7 @@
Source('timer_sp804.cc')
Source('rv_ctrl.cc')
Source('realview.cc')
+ Source('rtc_pl031.cc')
Source('timer_cpulocal.cc')
DebugFlag('AMBA')
diff -r 26dbd171754e -r fa8dcdd7e26c src/dev/arm/rtc_pl031.cc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/dev/arm/rtc_pl031.cc Thu Mar 01 17:26:31 2012 -0600
@@ -0,0 +1,251 @@
+/*
+ * Copyright (c) 2010-2012 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: Ali Saidi
+ */
+
+#include "base/intmath.hh"
+#include "base/time.hh"
+#include "base/trace.hh"
+#include "debug/Checkpoint.hh"
+#include "debug/Timer.hh"
+#include "dev/arm/amba_device.hh"
+#include "dev/arm/rtc_pl031.hh"
+#include "dev/mc146818.hh"
+#include "mem/packet.hh"
+#include "mem/packet_access.hh"
+
+using namespace AmbaDev;
+
+PL031::PL031(Params *p)
+ : AmbaIntDevice(p), timeVal(mkutctime(&p->time)), lastWrittenTick(0),
+ loadVal(0), matchVal(0), rawInt(false), pendingInt(false),
+ matchEvent(this)
+{
+ pioSize = 0xfff;
+}
+
+
+Tick
+PL031::read(PacketPtr pkt)
+{
+ assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
+ assert(pkt->getSize() == 4);
+ Addr daddr = pkt->getAddr() - pioAddr;
+ pkt->allocate();
+ uint32_t data;
+
+ DPRINTF(Timer, "Reading from RTC at offset: %#x\n", daddr);
+
+ switch (daddr) {
+ case DataReg:
+ data = timeVal + ((curTick() - lastWrittenTick) / SimClock::Int::s);
+ break;
+ case MatchReg:
+ data = matchVal;
+ break;
+ case LoadReg:
+ data = loadVal;
+ break;
+ case ControlReg:
+ data = 1; // Always enabled otherwise there is no point
+ break;
+ case IntMask:
+ data = maskInt;
+ break;
+ case RawISR:
+ data = rawInt;
+ break;
+ case MaskedISR:
+ data = pendingInt;
+ break;
+ default:
+ if (AmbaDev::readId(pkt, ambaId, pioAddr)) {
+ // Hack for variable sized access
+ data = pkt->get<uint32_t>();
+ break;
+ }
+ panic("Tried to read PL031 at offset %#x that doesn't exist\n", daddr);
+ break;
+ }
+
+ switch(pkt->getSize()) {
+ case 1:
+ pkt->set<uint8_t>(data);
+ break;
+ case 2:
+ pkt->set<uint16_t>(data);
+ break;
+ case 4:
+ pkt->set<uint32_t>(data);
+ break;
+ default:
+ panic("Uart read size too big?\n");
+ break;
+ }
+
+
+ pkt->makeAtomicResponse();
+ return pioDelay;
+}
+
+Tick
+PL031::write(PacketPtr pkt)
+{
+ assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
+ assert(pkt->getSize() == 4);
+ Addr daddr = pkt->getAddr() - pioAddr;
+ pkt->allocate();
+ DPRINTF(Timer, "Writing to RTC at offset: %#x\n", daddr);
+
+ switch (daddr) {
+ case DataReg:
+ break;
+ case MatchReg:
+ matchVal = pkt->get<uint32_t>();
+ resyncMatch();
+ break;
+ case LoadReg:
+ lastWrittenTick = curTick();
+ timeVal = pkt->get<uint32_t>();
+ loadVal = timeVal;
+ resyncMatch();
+ break;
+ case ControlReg:
+ break; // Can't stop when started
+ case IntMask:
+ maskInt = pkt->get<uint32_t>();
+ break;
+ case IntClear:
+ if (pkt->get<uint32_t>()) {
+ rawInt = false;
+ pendingInt = false;
+ }
+ break;
+ default:
+ if (AmbaDev::readId(pkt, ambaId, pioAddr))
+ break;
+ panic("Tried to read PL031 at offset %#x that doesn't exist\n", daddr);
+ break;
+ }
+
+ pkt->makeAtomicResponse();
+ return pioDelay;
+}
+
+void
+PL031::resyncMatch()
+{
+ DPRINTF(Timer, "Setting up new match event match=%d time=%d\n", matchVal,
+ timeVal);
+
+ uint32_t seconds_until = matchVal - timeVal;
+ Tick ticks_until = SimClock::Int::s * seconds_until;
+
+ if (matchEvent.scheduled()) {
+ DPRINTF(Timer, "-- Event was already schedule, de-scheduling\n");
+ deschedule(matchEvent);
+ }
+ schedule(matchEvent, curTick() + ticks_until);
+ DPRINTF(Timer, "-- Scheduling new event for: %d\n", curTick() +
ticks_until);
+}
+
+void
+PL031::counterMatch()
+{
+ DPRINTF(Timer, "Counter reached zero\n");
+
+ rawInt = true;
+ bool old_pending = pendingInt;
+ pendingInt = maskInt & rawInt;
+ if (pendingInt && ~old_pending) {
+ DPRINTF(Timer, "-- Causing interrupt\n");
+ gic->sendInt(intNum);
+ }
+}
+
+void
+PL031::serialize(std::ostream &os)
+{
+ DPRINTF(Checkpoint, "Serializing Arm PL031\n");
+ SERIALIZE_SCALAR(timeVal);
+ SERIALIZE_SCALAR(lastWrittenTick);
+ SERIALIZE_SCALAR(loadVal);
+ SERIALIZE_SCALAR(matchVal);
+ SERIALIZE_SCALAR(rawInt);
+ SERIALIZE_SCALAR(maskInt);
+ SERIALIZE_SCALAR(pendingInt);
+
+ bool is_in_event = matchEvent.scheduled();
+ SERIALIZE_SCALAR(is_in_event);
+
+ Tick event_time;
+ if (is_in_event){
+ event_time = matchEvent.when();
+ SERIALIZE_SCALAR(event_time);
+ }
+}
+
+void
+PL031::unserialize(Checkpoint *cp, const std::string §ion)
+{
+ DPRINTF(Checkpoint, "Unserializing Arm PL031\n");
+
+ UNSERIALIZE_SCALAR(timeVal);
+ UNSERIALIZE_SCALAR(lastWrittenTick);
+ UNSERIALIZE_SCALAR(loadVal);
+ UNSERIALIZE_SCALAR(matchVal);
+ UNSERIALIZE_SCALAR(rawInt);
+ UNSERIALIZE_SCALAR(maskInt);
+ UNSERIALIZE_SCALAR(pendingInt);
+
+ bool is_in_event;
+ UNSERIALIZE_SCALAR(is_in_event);
+
+ Tick event_time;
+ if (is_in_event){
+ UNSERIALIZE_SCALAR(event_time);
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