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Diffstat (limited to 'src/dev/arm/timer_cpulocal.hh')
| -rw-r--r-- | src/dev/arm/timer_cpulocal.hh | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/src/dev/arm/timer_cpulocal.hh b/src/dev/arm/timer_cpulocal.hh new file mode 100644 index 000000000..5357ac0eb --- /dev/null +++ b/src/dev/arm/timer_cpulocal.hh @@ -0,0 +1,199 @@ +/* + * Copyright (c) 2010-2011 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 + * Geoffrey Blake + */ + +#ifndef __DEV_ARM_LOCALTIMER_HH__ +#define __DEV_ARM_LOCALTIMER_HH__ + +#include "base/range.hh" +#include "dev/io_device.hh" +#include "params/CpuLocalTimer.hh" + +/** @file + * This implements the cpu local timer from the Cortex-A9 MPCore + * Technical Reference Manual rev r2p2 (ARM DDI 0407F) + */ + +class Gic; + +class CpuLocalTimer : public BasicPioDevice +{ + protected: + class Timer + { + + public: + enum { + TimerLoadReg = 0x00, + TimerCounterReg = 0x04, + TimerControlReg = 0x08, + TimerIntStatusReg = 0x0C, + WatchdogLoadReg = 0x20, + WatchdogCounterReg = 0x24, + WatchdogControlReg = 0x28, + WatchdogIntStatusReg = 0x2C, + WatchdogResetStatusReg = 0x30, + WatchdogDisableReg = 0x34, + Size = 0x38 + }; + + BitUnion32(TimerCtrl) + Bitfield<0> enable; + Bitfield<1> autoReload; + Bitfield<2> intEnable; + Bitfield<3,7> reserved; + Bitfield<8,15> prescalar; + EndBitUnion(TimerCtrl) + + BitUnion32(WatchdogCtrl) + Bitfield<0> enable; + Bitfield<1> autoReload; + Bitfield<2> intEnable; + Bitfield<3> watchdogMode; + Bitfield<4,7> reserved; + Bitfield<8,15> prescalar; + EndBitUnion(WatchdogCtrl) + + protected: + std::string _name; + + /** Pointer to parent class */ + CpuLocalTimer *parent; + + /** Number of interrupt to cause/clear */ + uint32_t intNumTimer; + uint32_t intNumWatchdog; + + /** Cpu this timer is attached to */ + uint32_t cpuNum; + + /** Number of ticks in a clock input */ + Tick clock; + + /** Control register as specified above */ + TimerCtrl timerControl; + WatchdogCtrl watchdogControl; + + /** If timer has caused an interrupt. This is irrespective of + * interrupt enable */ + bool rawIntTimer; + bool rawIntWatchdog; + bool rawResetWatchdog; + uint32_t watchdogDisableReg; + + /** If an interrupt is currently pending. Logical and of Timer or + * Watchdog Ctrl.enable and rawIntTimer or rawIntWatchdog */ + bool pendingIntTimer; + bool pendingIntWatchdog; + + /** Value to load into counters when periodic mode reaches 0 */ + uint32_t timerLoadValue; + uint32_t watchdogLoadValue; + + /** Called when the counter reaches 0 */ + void timerAtZero(); + EventWrapper<Timer, &Timer::timerAtZero> timerZeroEvent; + + void watchdogAtZero(); + EventWrapper<Timer, &Timer::watchdogAtZero> watchdogZeroEvent; + public: + /** Restart the counter ticking at val + * @param val the value to start at */ + void restartTimerCounter(uint32_t val); + void restartWatchdogCounter(uint32_t val); + + Timer(); + + std::string name() const { return _name; } + + /** Handle read for a single timer */ + void read(PacketPtr pkt, Addr daddr); + + /** Handle write for a single timer */ + void write(PacketPtr pkt, Addr daddr); + + void serialize(std::ostream &os); + void unserialize(Checkpoint *cp, const std::string §ion); + + friend class CpuLocalTimer; + }; + + static const int CPU_MAX = 8; + + /** Pointer to the GIC for causing an interrupt */ + Gic *gic; + + /** Timers that do the actual work */ + Timer localTimer[CPU_MAX]; + + public: + typedef CpuLocalTimerParams Params; + const Params * + params() const + { + return dynamic_cast<const Params *>(_params); + } + /** + * The constructor for RealView just registers itself with the MMU. + * @param p params structure + */ + CpuLocalTimer(Params *p); + + /** + * Handle a read to the device + * @param pkt The memory request. + * @return Returns latency of device read + */ + virtual Tick read(PacketPtr pkt); + + /** + * Handle a write to the device. + * @param pkt The memory request. + * @return Returns latency of device write + */ + virtual Tick write(PacketPtr pkt); + + + virtual void serialize(std::ostream &os); + virtual void unserialize(Checkpoint *cp, const std::string §ion); +}; + + +#endif // __DEV_ARM_SP804_HH__ + |