summaryrefslogtreecommitdiff
path: root/src/dev/arm/hdlcd.cc
blob: a92ae46279f8f60496e10565973db3004c5cc773 (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
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
/*
 * Copyright (c) 2010-2013, 2015, 2017 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: Chris Emmons
 *          Andreas Sandberg
 */

#include "dev/arm/hdlcd.hh"

#include "base/output.hh"
#include "base/trace.hh"
#include "base/vnc/vncinput.hh"
#include "debug/Checkpoint.hh"
#include "debug/HDLcd.hh"
#include "dev/arm/amba_device.hh"
#include "dev/arm/base_gic.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
#include "params/HDLcd.hh"
#include "sim/system.hh"

using std::vector;


// initialize hdlcd registers
HDLcd::HDLcd(const HDLcdParams *p)
    : AmbaDmaDevice(p, 0xFFFF),
      // Parameters
      vnc(p->vnc),
      workaroundSwapRB(p->workaround_swap_rb),
      workaroundDmaLineCount(p->workaround_dma_line_count),
      addrRanges{RangeSize(pioAddr, pioSize)},
      enableCapture(p->enable_capture),
      pixelBufferSize(p->pixel_buffer_size),

      // Registers
      version(VERSION_RESETV),
      int_rawstat(0), int_mask(0),

      fb_base(0), fb_line_length(0), fb_line_count(0), fb_line_pitch(0),
      bus_options(BUS_OPTIONS_RESETV),

      v_sync(0), v_back_porch(0), v_data(0), v_front_porch(0),
      h_sync(0), h_back_porch(0), h_data(0), h_front_porch(0),
      polarities(0),

      command(0),

      pixel_format(0),
      red_select(0), green_select(0), blue_select(0),

      // Other
      bmp(&pixelPump.fb), pic(NULL), conv(PixelConverter::rgba8888_le),
      pixelPump(*this, *p->pxl_clk, p->pixel_chunk)
{
    if (vnc)
        vnc->setFrameBuffer(&pixelPump.fb);
}

HDLcd::~HDLcd()
{
}

void
HDLcd::regStats()
{
    AmbaDmaDevice::regStats();

    using namespace Stats;

    stats.underruns
        .name(name() + ".underruns")
        .desc("number of buffer underruns")
        .flags(nozero)
        ;
}

void
HDLcd::serialize(CheckpointOut &cp) const
{
    DPRINTF(Checkpoint, "Serializing ARM HDLCD\n");

    SERIALIZE_SCALAR(int_rawstat);
    SERIALIZE_SCALAR(int_mask);

    SERIALIZE_SCALAR(fb_base);
    SERIALIZE_SCALAR(fb_line_length);
    SERIALIZE_SCALAR(fb_line_count);
    SERIALIZE_SCALAR(fb_line_pitch);
    SERIALIZE_SCALAR(bus_options);

    SERIALIZE_SCALAR(v_sync);
    SERIALIZE_SCALAR(v_back_porch);
    SERIALIZE_SCALAR(v_data);
    SERIALIZE_SCALAR(v_front_porch);

    SERIALIZE_SCALAR(h_sync);
    SERIALIZE_SCALAR(h_back_porch);
    SERIALIZE_SCALAR(h_data);
    SERIALIZE_SCALAR(h_front_porch);

    SERIALIZE_SCALAR(polarities);

    SERIALIZE_SCALAR(command);
    SERIALIZE_SCALAR(pixel_format);
    SERIALIZE_SCALAR(red_select);
    SERIALIZE_SCALAR(green_select);
    SERIALIZE_SCALAR(blue_select);

    SERIALIZE_OBJ(pixelPump);
    if (enabled())
        dmaEngine->serializeSection(cp, "dmaEngine");
}

void
HDLcd::unserialize(CheckpointIn &cp)
{
    DPRINTF(Checkpoint, "Unserializing ARM HDLCD\n");

    UNSERIALIZE_SCALAR(int_rawstat);
    UNSERIALIZE_SCALAR(int_mask);

    UNSERIALIZE_SCALAR(fb_base);
    UNSERIALIZE_SCALAR(fb_line_length);
    UNSERIALIZE_SCALAR(fb_line_count);
    UNSERIALIZE_SCALAR(fb_line_pitch);
    UNSERIALIZE_SCALAR(bus_options);

    UNSERIALIZE_SCALAR(v_sync);
    UNSERIALIZE_SCALAR(v_back_porch);
    UNSERIALIZE_SCALAR(v_data);
    UNSERIALIZE_SCALAR(v_front_porch);

    UNSERIALIZE_SCALAR(h_sync);
    UNSERIALIZE_SCALAR(h_back_porch);
    UNSERIALIZE_SCALAR(h_data);
    UNSERIALIZE_SCALAR(h_front_porch);

    UNSERIALIZE_SCALAR(polarities);

    UNSERIALIZE_SCALAR(command);
    UNSERIALIZE_SCALAR(pixel_format);
    UNSERIALIZE_SCALAR(red_select);
    UNSERIALIZE_SCALAR(green_select);
    UNSERIALIZE_SCALAR(blue_select);

    {
        // Try to unserialize the pixel pump. It might not exist if
        // we're unserializing an old checkpoint.
        ScopedCheckpointSection sec(cp, "pixelPump");
        if (cp.sectionExists(Serializable::currentSection()))
            pixelPump.unserialize(cp);
    }

    if (enabled()) {
        // Create the DMA engine and read its state from the
        // checkpoint. We don't need to worry about the pixel pump as
        // it is a proper SimObject.
        createDmaEngine();
        dmaEngine->unserializeSection(cp, "dmaEngine");

        conv = pixelConverter();
    }
}

void
HDLcd::drainResume()
{
    AmbaDmaDevice::drainResume();

    // We restored from an old checkpoint without a pixel pump, start
    // an new refresh. This typically happens when restoring from old
    // checkpoints.
    if (enabled() && !pixelPump.active()) {
        // Update timing parameter before rendering frames
        pixelPump.updateTimings(displayTimings());
        pixelPump.start();
    }

    // We restored from a checkpoint and need to update the VNC server
    if (pixelPump.active() && vnc)
        vnc->setDirty();
}

// read registers and frame buffer
Tick
HDLcd::read(PacketPtr pkt)
{
    assert(pkt->getAddr() >= pioAddr &&
           pkt->getAddr() < pioAddr + pioSize);

    const Addr daddr(pkt->getAddr() - pioAddr);
    panic_if(pkt->getSize() != 4,
             "Unhandled read size (address: 0x.4x, size: %u)",
             daddr, pkt->getSize());

    const uint32_t data(readReg(daddr));
    DPRINTF(HDLcd, "read register 0x%04x: 0x%x\n", daddr, data);

    pkt->set<uint32_t>(data);
    pkt->makeAtomicResponse();
    return pioDelay;
}

// write registers and frame buffer
Tick
HDLcd::write(PacketPtr pkt)
{
    assert(pkt->getAddr() >= pioAddr &&
           pkt->getAddr() < pioAddr + pioSize);

    const Addr daddr(pkt->getAddr() - pioAddr);
    panic_if(pkt->getSize() != 4,
             "Unhandled read size (address: 0x.4x, size: %u)",
             daddr, pkt->getSize());
    const uint32_t data(pkt->get<uint32_t>());
    DPRINTF(HDLcd, "write register 0x%04x: 0x%x\n", daddr, data);

    writeReg(daddr, data);

    pkt->makeAtomicResponse();
    return pioDelay;
}

uint32_t
HDLcd::readReg(Addr offset)
{
    switch (offset) {
      case Version: return version;

      case Int_RawStat: return int_rawstat;
      case Int_Clear:
        panic("HDLCD INT_CLEAR register is Write-Only\n");
      case Int_Mask: return int_mask;
      case Int_Status: return intStatus();

      case Fb_Base: return fb_base;
      case Fb_Line_Length: return fb_line_length;
      case Fb_Line_Count: return fb_line_count;
      case Fb_Line_Pitch: return fb_line_pitch;
      case Bus_Options: return bus_options;

      case V_Sync: return v_sync;
      case V_Back_Porch: return v_back_porch;
      case V_Data: return v_data;
      case V_Front_Porch: return v_front_porch;
      case H_Sync: return h_sync;
      case H_Back_Porch: return h_back_porch;
      case H_Data: return h_data;
      case H_Front_Porch: return h_front_porch;
      case Polarities: return polarities;

      case Command: return command;
      case Pixel_Format: return pixel_format;
      case Red_Select: return red_select;
      case Green_Select: return green_select;
      case Blue_Select: return blue_select;

      default:
        panic("Tried to read HDLCD register that doesn't  exist\n", offset);
    }
}

void
HDLcd::writeReg(Addr offset, uint32_t value)
{
    switch (offset) {
      case Version:
        panic("HDLCD VERSION register is read-Only\n");

      case Int_RawStat:
        intRaise(value);
        return;
      case Int_Clear:
        intClear(value);
        return;
      case Int_Mask:
        intMask(value);
        return;
      case Int_Status:
        panic("HDLCD INT_STATUS register is read-Only\n");
        break;

      case Fb_Base:
        fb_base = value;
        return;

      case Fb_Line_Length:
        fb_line_length = value;
        return;

      case Fb_Line_Count:
        fb_line_count = value;
        return;

      case Fb_Line_Pitch:
        fb_line_pitch = value;
        return;

      case Bus_Options: {
          const BusOptsReg old_bus_options(bus_options);
          bus_options = value;

          if (bus_options.max_outstanding != old_bus_options.max_outstanding) {
              DPRINTF(HDLcd,
                      "Changing HDLcd outstanding DMA transactions: %d -> %d\n",
                      old_bus_options.max_outstanding,
                      bus_options.max_outstanding);

          }

          if (bus_options.burst_len != old_bus_options.burst_len) {
              DPRINTF(HDLcd,
                      "Changing HDLcd DMA burst flags: 0x%x -> 0x%x\n",
                      old_bus_options.burst_len, bus_options.burst_len);
          }
      } return;

      case V_Sync:
        v_sync = value;
        return;
      case V_Back_Porch:
        v_back_porch = value;
        return;
      case V_Data:
        v_data = value;
        return;
      case V_Front_Porch:
        v_front_porch = value;
        return;

      case H_Sync:
        h_sync = value;
        return;
      case H_Back_Porch:
        h_back_porch = value;
        return;
      case H_Data:
        h_data = value;
        return;
      case H_Front_Porch:
        h_front_porch = value;
        return;

      case Polarities:
        polarities = value;
        return;

      case Command: {
          const CommandReg new_command(value);

          if (new_command.enable != command.enable) {
              DPRINTF(HDLcd, "HDLCD switched %s\n",
                      new_command.enable ? "on" : "off");

              if (new_command.enable) {
                  cmdEnable();
              } else {
                  cmdDisable();
              }
          }
          command = new_command;
      } return;

      case Pixel_Format:
        pixel_format = value;
        return;

      case Red_Select:
        red_select = value;
        return;
      case Green_Select:
        green_select = value;
        return;
      case Blue_Select:
        blue_select = value;
        return;

      default:
        panic("Tried to write HDLCD register that doesn't exist\n", offset);
        return;
    }
}

PixelConverter
HDLcd::pixelConverter() const
{
    ByteOrder byte_order(
        pixel_format.big_endian ? BigEndianByteOrder : LittleEndianByteOrder);

    /* Some Linux kernels have a broken driver that swaps the red and
     * blue color select registers. */
    if (!workaroundSwapRB) {
        return PixelConverter(
            pixel_format.bytes_per_pixel + 1,
            red_select.offset, green_select.offset, blue_select.offset,
            red_select.size, green_select.size, blue_select.size,
            byte_order);
    } else {
        return PixelConverter(
            pixel_format.bytes_per_pixel + 1,
            blue_select.offset, green_select.offset, red_select.offset,
            blue_select.size, green_select.size, red_select.size,
            byte_order);
    }
}

DisplayTimings
HDLcd::displayTimings() const
{
    return DisplayTimings(
        h_data.val + 1, v_data.val + 1,
        h_back_porch.val + 1, h_sync.val + 1, h_front_porch.val + 1,
        v_back_porch.val + 1, v_sync.val + 1, v_front_porch.val + 1);
}

void
HDLcd::createDmaEngine()
{
    if (bus_options.max_outstanding == 0) {
        warn("Maximum number of outstanding DMA transfers set to 0.");
        return;
    }

    const uint32_t dma_burst_flags(bus_options.burst_len);
    const uint32_t dma_burst_len(
        dma_burst_flags ?
        (1UL << (findMsbSet(dma_burst_flags) - 1)) :
        MAX_BURST_LEN);
    // Some drivers seem to set the DMA line count incorrectly. This
    // could either be a driver bug or a specification bug. Unlike for
    // timings, the specification does not require 1 to be added to
    // the DMA engine's line count.
    const uint32_t dma_lines(
        fb_line_count + (workaroundDmaLineCount ? 1 : 0));

    dmaEngine.reset(new DmaEngine(
                        *this, pixelBufferSize,
                        AXI_PORT_WIDTH * dma_burst_len,
                        bus_options.max_outstanding,
                        fb_line_length, fb_line_pitch, dma_lines));
}

void
HDLcd::cmdEnable()
{
    createDmaEngine();
    conv = pixelConverter();

    // Update timing parameter before rendering frames
    pixelPump.updateTimings(displayTimings());
    pixelPump.start();
}

void
HDLcd::cmdDisable()
{
    pixelPump.stop();
    dmaEngine->abortFrame();
}

bool
HDLcd::pxlNext(Pixel &p)
{
    uint8_t pixel_data[MAX_PIXEL_SIZE];
    assert(conv.length <= sizeof(pixel_data));
    if (dmaEngine->tryGet(pixel_data, conv.length)) {
        p = conv.toPixel(pixel_data);
        return true;
    } else {
        return false;
    }
}

void
HDLcd::pxlVSyncBegin()
{
    DPRINTF(HDLcd, "Raising VSYNC interrupt.\n");
    intRaise(INT_VSYNC);
}

void
HDLcd::pxlVSyncEnd()
{
    DPRINTF(HDLcd, "End of VSYNC, starting DMA engine\n");
    dmaEngine->startFrame(fb_base);
}

void
HDLcd::pxlUnderrun()
{
    DPRINTF(HDLcd, "Buffer underrun, stopping DMA fill.\n");
    ++stats.underruns;
    intRaise(INT_UNDERRUN);
    dmaEngine->abortFrame();
}

void
HDLcd::pxlFrameDone()
{
    DPRINTF(HDLcd, "Reached end of last visible line.\n");

    if (dmaEngine->size()) {
        warn("HDLCD %u bytes still in FIFO after frame: Ensure that DMA "
             "and PixelPump configuration is consistent\n",
             dmaEngine->size());
        dmaEngine->dumpSettings();
        pixelPump.dumpSettings();
    }

    if (vnc)
        vnc->setDirty();

    if (enableCapture) {
        if (!pic) {
            pic = simout.create(
                csprintf("%s.framebuffer.bmp", sys->name()),
                true);
        }

        assert(pic);
        pic->stream()->seekp(0);
        bmp.write(*pic->stream());
    }
}

void
HDLcd::setInterrupts(uint32_t ints, uint32_t mask)
{
    const bool old_ints(intStatus());

    int_mask = mask;
    int_rawstat = ints;

    if (!old_ints && intStatus()) {
        gic->sendInt(intNum);
    } else if (old_ints && !intStatus()) {
        gic->clearInt(intNum);
    }
}

HDLcd::DmaEngine::DmaEngine(HDLcd &_parent, size_t size,
          unsigned request_size, unsigned max_pending,
          size_t line_size, ssize_t line_pitch, unsigned num_lines)
    : DmaReadFifo(
        _parent.dmaPort, size, request_size, max_pending,
        Request::UNCACHEABLE),
      parent(_parent),
      lineSize(line_size), linePitch(line_pitch), numLines(num_lines),
      nextLineAddr(0)
{
}

void
HDLcd::DmaEngine::serialize(CheckpointOut &cp) const
{
    DmaReadFifo::serialize(cp);

    SERIALIZE_SCALAR(nextLineAddr);
    SERIALIZE_SCALAR(frameEnd);
}

void
HDLcd::DmaEngine::unserialize(CheckpointIn &cp)
{
    DmaReadFifo::unserialize(cp);

    UNSERIALIZE_SCALAR(nextLineAddr);
    UNSERIALIZE_SCALAR(frameEnd);
}

void
HDLcd::DmaEngine::startFrame(Addr fb_base)
{
    nextLineAddr = fb_base;
    frameEnd = fb_base + numLines * linePitch;

    startFill(nextLineAddr, lineSize);
}

void
HDLcd::DmaEngine::abortFrame()
{
    nextLineAddr = frameEnd;
    stopFill();
    flush();
}


void
HDLcd::DmaEngine::dumpSettings()
{
    inform("DMA line size: %u bytes", lineSize);
    inform("DMA line pitch: %i bytes", linePitch);
    inform("DMA num lines: %u", numLines);
}

void
HDLcd::DmaEngine::onEndOfBlock()
{
    if (nextLineAddr == frameEnd)
        // We're done with this frame. Ignore calls to this method
        // until the next frame has been started.
        return;

    nextLineAddr += linePitch;
    if (nextLineAddr != frameEnd)
        startFill(nextLineAddr, lineSize);
}

void
HDLcd::DmaEngine::onIdle()
{
    parent.intRaise(INT_DMA_END);
}

void
HDLcd::PixelPump::dumpSettings()
{
    const DisplayTimings &t(timings());

    inform("PixelPump width: %u", t.width);
    inform("PixelPump height: %u", t.height);

    inform("PixelPump horizontal back porch: %u", t.hBackPorch);
    inform("PixelPump horizontal fron porch: %u", t.hFrontPorch);
    inform("PixelPump horizontal fron porch: %u", t.hSync);

    inform("PixelPump vertical back porch: %u", t.vBackPorch);
    inform("PixelPump vertical fron porch: %u", t.vFrontPorch);
    inform("PixelPump vertical fron porch: %u", t.vSync);
}


HDLcd *
HDLcdParams::create()
{
    return new HDLcd(this);
}