1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
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__
|
