summaryrefslogtreecommitdiff
path: root/dev/tsunami_io.cc
blob: da1062237ef558473008c274aacbbf912725ac64 (plain)
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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
/*
 * Copyright (c) 2004-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * 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.
 */

/** @file
 * Tsunami I/O including PIC, PIT, RTC, DMA
 */

#include <sys/time.h>

#include <deque>
#include <string>
#include <vector>

#include "base/trace.hh"
#include "dev/tsunami_io.hh"
#include "dev/tsunami.hh"
#include "mem/bus/bus.hh"
#include "mem/bus/pio_interface.hh"
#include "mem/bus/pio_interface_impl.hh"
#include "sim/builder.hh"
#include "dev/tsunami_cchip.hh"
#include "dev/tsunamireg.h"
#include "dev/rtcreg.h"
#include "mem/functional/memory_control.hh"

using namespace std;

#define UNIX_YEAR_OFFSET 52

// Timer Event for Periodic interrupt of RTC
TsunamiIO::RTCEvent::RTCEvent(Tsunami* t, Tick i)
    : Event(&mainEventQueue), tsunami(t), interval(i)
{
    DPRINTF(MC146818, "RTC Event Initilizing\n");
    schedule(curTick + interval);
}

void
TsunamiIO::RTCEvent::process()
{
    DPRINTF(MC146818, "RTC Timer Interrupt\n");
    schedule(curTick + interval);
    //Actually interrupt the processor here
    tsunami->cchip->postRTC();
}

const char *
TsunamiIO::RTCEvent::description()
{
    return "tsunami RTC interrupt";
}

void
TsunamiIO::RTCEvent::serialize(std::ostream &os)
{
    Tick time = when();
    SERIALIZE_SCALAR(time);
}

void
TsunamiIO::RTCEvent::unserialize(Checkpoint *cp, const std::string &section)
{
    Tick time;
    UNSERIALIZE_SCALAR(time);
    reschedule(time);
}


// Timer Event for PIT Timers
TsunamiIO::ClockEvent::ClockEvent()
    : Event(&mainEventQueue)
{
    /* This is the PIT Tick Rate. A constant for the 8254 timer. The
     * Tsunami platform has one of these cycle counters on the Cypress
     * South Bridge and it is used by linux for estimating the cycle
     * frequency of the machine it is running on. --Ali
     */
    interval = (Tick)(Clock::Float::s / 1193180.0);

    DPRINTF(Tsunami, "Clock Event Initilizing\n");
    mode = 0;
}

void
TsunamiIO::ClockEvent::process()
{
    DPRINTF(Tsunami, "Timer Interrupt\n");
    if (mode == 0)
        status = 0x20; // set bit that linux is looking for
    else
        schedule(curTick + interval);
}

void
TsunamiIO::ClockEvent::Program(int count)
{
    DPRINTF(Tsunami, "Timer set to curTick + %d\n", count * interval);
    schedule(curTick + count * interval);
    status = 0;
}

const char *
TsunamiIO::ClockEvent::description()
{
    return "tsunami 8254 Interval timer";
}

void
TsunamiIO::ClockEvent::ChangeMode(uint8_t md)
{
    mode = md;
}

uint8_t
TsunamiIO::ClockEvent::Status()
{
    return status;
}

void
TsunamiIO::ClockEvent::serialize(std::ostream &os)
{
    Tick time = scheduled() ? when() : 0;
    SERIALIZE_SCALAR(time);
    SERIALIZE_SCALAR(status);
    SERIALIZE_SCALAR(mode);
    SERIALIZE_SCALAR(interval);
}

void
TsunamiIO::ClockEvent::unserialize(Checkpoint *cp, const std::string &section)
{
    Tick time;
    UNSERIALIZE_SCALAR(time);
    UNSERIALIZE_SCALAR(status);
    UNSERIALIZE_SCALAR(mode);
    UNSERIALIZE_SCALAR(interval);
    if (time)
        schedule(time);
}

TsunamiIO::TsunamiIO(const string &name, Tsunami *t, time_t init_time,
                     Addr a, MemoryController *mmu, HierParams *hier, Bus *bus,
                     Tick pio_latency, Tick ci)
    : PioDevice(name, t), addr(a), clockInterval(ci), tsunami(t), rtc(t, ci)
{
    mmu->add_child(this, RangeSize(addr, size));

    if (bus) {
        pioInterface = newPioInterface(name, hier, bus, this,
                                       &TsunamiIO::cacheAccess);
        pioInterface->addAddrRange(RangeSize(addr, size));
        pioLatency = pio_latency * bus->clockRate;
    }

    // set the back pointer from tsunami to myself
    tsunami->io = this;

    timerData = 0;
    set_time(init_time == 0 ? time(NULL) : init_time);
    uip = 1;
    picr = 0;
    picInterrupting = false;
}

Tick
TsunamiIO::frequency() const
{
    return Clock::Frequency / clockInterval;
}

void
TsunamiIO::set_time(time_t t)
{
    gmtime_r(&t, &tm);
    DPRINTFN("Real-time clock set to %s", asctime(&tm));
}

Fault
TsunamiIO::read(MemReqPtr &req, uint8_t *data)
{
    DPRINTF(Tsunami, "io read  va=%#x size=%d IOPorrt=%#x\n",
            req->vaddr, req->size, req->vaddr & 0xfff);

    Addr daddr = (req->paddr - (addr & EV5::PAddrImplMask));


    switch(req->size) {
      case sizeof(uint8_t):
        switch(daddr) {
          case TSDEV_PIC1_ISR:
              // !!! If this is modified 64bit case needs to be too
              // Pal code has to do a 64 bit physical read because there is
              // no load physical byte instruction
              *(uint8_t*)data = picr;
              return No_Fault;
          case TSDEV_PIC2_ISR:
              // PIC2 not implemnted... just return 0
              *(uint8_t*)data = 0x00;
              return No_Fault;
          case TSDEV_TMR_CTL:
            *(uint8_t*)data = timer2.Status();
            return No_Fault;
          case TSDEV_RTC_DATA:
            switch(RTCAddress) {
              case RTC_CNTRL_REGA:
                *(uint8_t*)data = uip << 7 | 0x26;
                uip = !uip;
                return No_Fault;
              case RTC_CNTRL_REGB:
                // DM and 24/12 and UIE
                *(uint8_t*)data = 0x46;
                return No_Fault;
              case RTC_CNTRL_REGC:
                // If we want to support RTC user access in linux
                // This won't work, but for now it's fine
                *(uint8_t*)data = 0x00;
                return No_Fault;
              case RTC_CNTRL_REGD:
                panic("RTC Control Register D not implemented");
              case RTC_SEC:
                *(uint8_t *)data = tm.tm_sec;
                return No_Fault;
              case RTC_MIN:
                *(uint8_t *)data = tm.tm_min;
                return No_Fault;
              case RTC_HR:
                *(uint8_t *)data = tm.tm_hour;
                return No_Fault;
              case RTC_DOW:
                *(uint8_t *)data = tm.tm_wday;
                return No_Fault;
              case RTC_DOM:
                *(uint8_t *)data = tm.tm_mday;
              case RTC_MON:
                *(uint8_t *)data = tm.tm_mon + 1;
                return No_Fault;
              case RTC_YEAR:
                *(uint8_t *)data = tm.tm_year - UNIX_YEAR_OFFSET;
                return No_Fault;
              default:
                panic("Unknown RTC Address\n");
            }

          default:
            panic("I/O Read - va%#x size %d\n", req->vaddr, req->size);
        }
      case sizeof(uint16_t):
      case sizeof(uint32_t):
        panic("I/O Read - invalid size - va %#x size %d\n",
              req->vaddr, req->size);

      case sizeof(uint64_t):
       switch(daddr) {
          case TSDEV_PIC1_ISR:
              // !!! If this is modified 8bit case needs to be too
              // Pal code has to do a 64 bit physical read because there is
              // no load physical byte instruction
              *(uint64_t*)data = (uint64_t)picr;
              return No_Fault;
          default:
              panic("I/O Read - invalid size - va %#x size %d\n",
                    req->vaddr, req->size);
       }

      default:
        panic("I/O Read - invalid size - va %#x size %d\n",
              req->vaddr, req->size);
    }
    panic("I/O Read - va%#x size %d\n", req->vaddr, req->size);

    return No_Fault;
}

Fault
TsunamiIO::write(MemReqPtr &req, const uint8_t *data)
{

#if TRACING_ON
    uint8_t dt = *(uint8_t*)data;
    uint64_t dt64 = dt;
#endif

    DPRINTF(Tsunami, "io write - va=%#x size=%d IOPort=%#x Data=%#x\n",
            req->vaddr, req->size, req->vaddr & 0xfff, dt64);

    Addr daddr = (req->paddr - (addr & EV5::PAddrImplMask));

    switch(req->size) {
      case sizeof(uint8_t):
        switch(daddr) {
          case TSDEV_PIC1_MASK:
            mask1 = ~(*(uint8_t*)data);
            if ((picr & mask1) && !picInterrupting) {
                picInterrupting = true;
                tsunami->cchip->postDRIR(55);
                DPRINTF(Tsunami, "posting pic interrupt to cchip\n");
            }
            if ((!(picr & mask1)) && picInterrupting) {
                picInterrupting = false;
                tsunami->cchip->clearDRIR(55);
                DPRINTF(Tsunami, "clearing pic interrupt\n");
            }
            return No_Fault;
          case TSDEV_PIC2_MASK:
            mask2 = *(uint8_t*)data;
            //PIC2 Not implemented to interrupt
            return No_Fault;
          case TSDEV_PIC1_ACK:
            // clear the interrupt on the PIC
            picr &= ~(1 << (*(uint8_t*)data & 0xF));
            if (!(picr & mask1))
                tsunami->cchip->clearDRIR(55);
            return No_Fault;
          case TSDEV_PIC2_ACK:
            return No_Fault;
          case TSDEV_DMA1_RESET:
            return No_Fault;
          case TSDEV_DMA2_RESET:
            return No_Fault;
          case TSDEV_DMA1_MODE:
            mode1 = *(uint8_t*)data;
            return No_Fault;
          case TSDEV_DMA2_MODE:
            mode2 = *(uint8_t*)data;
            return No_Fault;
          case TSDEV_DMA1_MASK:
          case TSDEV_DMA2_MASK:
            return No_Fault;
          case TSDEV_TMR_CTL:
            return No_Fault;
          case TSDEV_TMR2_CTL:
            if ((*(uint8_t*)data & 0x30) != 0x30)
                panic("Only L/M write supported\n");

            switch(*(uint8_t*)data >> 6) {
              case 0:
                timer0.ChangeMode((*(uint8_t*)data & 0xF) >> 1);
                break;
              case 2:
                timer2.ChangeMode((*(uint8_t*)data & 0xF) >> 1);
                break;
              default:
                panic("Read Back Command not implemented\n");
            }
            return No_Fault;
          case TSDEV_TMR2_DATA:
            /* two writes before we actually start the Timer
               so I set a flag in the timerData */
            if(timerData & 0x1000) {
                timerData &= 0x1000;
                timerData += *(uint8_t*)data << 8;
                timer2.Program(timerData);
            } else {
                timerData = *(uint8_t*)data;
                timerData |= 0x1000;
            }
            return No_Fault;
          case TSDEV_TMR0_DATA:
            /* two writes before we actually start the Timer
               so I set a flag in the timerData */
            if(timerData & 0x1000) {
                timerData &= 0x1000;
                timerData += *(uint8_t*)data << 8;
                timer0.Program(timerData);
            } else {
                timerData = *(uint8_t*)data;
                timerData |= 0x1000;
            }
            return No_Fault;
          case TSDEV_RTC_ADDR:
            RTCAddress = *(uint8_t*)data;
            return No_Fault;
          case TSDEV_RTC_DATA:
            panic("RTC Write not implmented (rtc.o won't work)\n");
          default:
            panic("I/O Write - va%#x size %d\n", req->vaddr, req->size);
        }
      case sizeof(uint16_t):
      case sizeof(uint32_t):
      case sizeof(uint64_t):
      default:
        panic("I/O Write - invalid size - va %#x size %d\n",
              req->vaddr, req->size);
    }


    return No_Fault;
}

void
TsunamiIO::postPIC(uint8_t bitvector)
{
    //PIC2 Is not implemented, because nothing of interest there
    picr |= bitvector;
    if (picr & mask1) {
        tsunami->cchip->postDRIR(55);
        DPRINTF(Tsunami, "posting pic interrupt to cchip\n");
    }
}

void
TsunamiIO::clearPIC(uint8_t bitvector)
{
    //PIC2 Is not implemented, because nothing of interest there
    picr &= ~bitvector;
    if (!(picr & mask1)) {
        tsunami->cchip->clearDRIR(55);
        DPRINTF(Tsunami, "clearing pic interrupt to cchip\n");
    }
}

Tick
TsunamiIO::cacheAccess(MemReqPtr &req)
{
    return curTick + pioLatency;
}

void
TsunamiIO::serialize(std::ostream &os)
{
    SERIALIZE_SCALAR(timerData);
    SERIALIZE_SCALAR(uip);
    SERIALIZE_SCALAR(mask1);
    SERIALIZE_SCALAR(mask2);
    SERIALIZE_SCALAR(mode1);
    SERIALIZE_SCALAR(mode2);
    SERIALIZE_SCALAR(picr);
    SERIALIZE_SCALAR(picInterrupting);
    SERIALIZE_SCALAR(RTCAddress);

    // Serialize the timers
    nameOut(os, csprintf("%s.timer0", name()));
    timer0.serialize(os);
    nameOut(os, csprintf("%s.timer2", name()));
    timer2.serialize(os);
    nameOut(os, csprintf("%s.rtc", name()));
    rtc.serialize(os);
}

void
TsunamiIO::unserialize(Checkpoint *cp, const std::string &section)
{
    UNSERIALIZE_SCALAR(timerData);
    UNSERIALIZE_SCALAR(uip);
    UNSERIALIZE_SCALAR(mask1);
    UNSERIALIZE_SCALAR(mask2);
    UNSERIALIZE_SCALAR(mode1);
    UNSERIALIZE_SCALAR(mode2);
    UNSERIALIZE_SCALAR(picr);
    UNSERIALIZE_SCALAR(picInterrupting);
    UNSERIALIZE_SCALAR(RTCAddress);

    // Unserialize the timers
    timer0.unserialize(cp, csprintf("%s.timer0", section));
    timer2.unserialize(cp, csprintf("%s.timer2", section));
    rtc.unserialize(cp, csprintf("%s.rtc", section));
}

BEGIN_DECLARE_SIM_OBJECT_PARAMS(TsunamiIO)

    SimObjectParam<Tsunami *> tsunami;
    Param<time_t> time;
    SimObjectParam<MemoryController *> mmu;
    Param<Addr> addr;
    SimObjectParam<Bus*> io_bus;
    Param<Tick> pio_latency;
    SimObjectParam<HierParams *> hier;
    Param<Tick> frequency;

END_DECLARE_SIM_OBJECT_PARAMS(TsunamiIO)

BEGIN_INIT_SIM_OBJECT_PARAMS(TsunamiIO)

    INIT_PARAM(tsunami, "Tsunami"),
    INIT_PARAM(time, "System time to use (0 for actual time"),
    INIT_PARAM(mmu, "Memory Controller"),
    INIT_PARAM(addr, "Device Address"),
    INIT_PARAM_DFLT(io_bus, "The IO Bus to attach to", NULL),
    INIT_PARAM_DFLT(pio_latency, "Programmed IO latency in bus cycles", 1),
    INIT_PARAM_DFLT(hier, "Hierarchy global variables", &defaultHierParams),
    INIT_PARAM(frequency, "clock interrupt frequency")

END_INIT_SIM_OBJECT_PARAMS(TsunamiIO)

CREATE_SIM_OBJECT(TsunamiIO)
{
    return new TsunamiIO(getInstanceName(), tsunami, time,  addr, mmu, hier,
                         io_bus, pio_latency, frequency);
}

REGISTER_SIM_OBJECT("TsunamiIO", TsunamiIO)