From 8ed4f0a02cd936f717f5af0c15b64fedddd5af54 Mon Sep 17 00:00:00 2001 From: Ali Saidi Date: Mon, 23 Aug 2010 11:18:40 -0500 Subject: ARM: Add I/O devices for booting linux --HG-- rename : src/dev/arm/Versatile.py => src/dev/arm/RealView.py rename : src/dev/arm/versatile.cc => src/dev/arm/realview.cc rename : src/dev/arm/versatile.hh => src/dev/arm/realview.hh --- src/dev/arm/timer_sp804.hh | 167 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 167 insertions(+) create mode 100644 src/dev/arm/timer_sp804.hh (limited to 'src/dev/arm/timer_sp804.hh') diff --git a/src/dev/arm/timer_sp804.hh b/src/dev/arm/timer_sp804.hh new file mode 100644 index 000000000..1039456ab --- /dev/null +++ b/src/dev/arm/timer_sp804.hh @@ -0,0 +1,167 @@ +/* + * Copyright (c) 2010 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 + */ + +#ifndef __DEV_ARM_SP804_HH__ +#define __DEV_ARM_SP804_HH__ + +#include "base/range.hh" +#include "dev/arm/amba_device.hh" +#include "params/Sp804.hh" + +/** @file + * This implements the dual Sp804 timer block + */ + +class Gic; + +class Sp804 : public AmbaDevice +{ + protected: + class Timer + { + + public: + enum { + LoadReg = 0x00, + CurrentReg = 0x04, + ControlReg = 0x08, + IntClear = 0x0C, + RawISR = 0x10, + MaskedISR = 0x14, + BGLoad = 0x18, + Size = 0x20 + }; + + BitUnion32(CTRL) + Bitfield<0> oneShot; + Bitfield<1> timerSize; + Bitfield<3,2> timerPrescale; + Bitfield<5> intEnable; + Bitfield<6> timerMode; + Bitfield<7> timerEnable; + EndBitUnion(CTRL) + + protected: + std::string _name; + + /** Pointer to parent class */ + Sp804 *parent; + + /** Number of interrupt to cause/clear */ + uint32_t intNum; + + /** Number of ticks in a clock input */ + Tick clock; + + /** Control register as specified above */ + CTRL control; + + /** If timer has caused an interrupt. This is irrespective of + * interrupt enable */ + bool rawInt; + + /** If an interrupt is currently pending. Logical and of CTRL.intEnable + * and rawInt */ + bool pendingInt; + + /** Value to load into counter when periodic mode reaches 0 */ + uint32_t loadValue; + + /** Called when the counter reaches 0 */ + void counterAtZero(); + EventWrapper zeroEvent; + + public: + /** Restart the counter ticking at val + * @param val the value to start at (pre-16 bit masking if en) */ + void restartCounter(uint32_t val); + + Timer(std::string __name, Sp804 *parent, int int_num, Tick clock); + + 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); + }; + + /** Pointer to the GIC for causing an interrupt */ + Gic *gic; + + /** Timers that do the actual work */ + Timer timer0; + Timer timer1; + + public: + typedef Sp804Params Params; + const Params * + params() const + { + return dynamic_cast(_params); + } + /** + * The constructor for RealView just registers itself with the MMU. + * @param p params structure + */ + Sp804(Params *p); + + /** + * Handle a read to the device + * @param pkt The memory request. + * @param data Where to put the data. + */ + virtual Tick read(PacketPtr pkt); + + /** + * All writes are simply ignored. + * @param pkt The memory request. + * @param data the data + */ + 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__ + -- cgit v1.2.3