aboutsummaryrefslogtreecommitdiffstats
path: root/ice40/bitstream.cc
blob: 89f84262077224bae90f0548588f7f84e7de0d36 (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
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
/*
 *  nextpnr -- Next Generation Place and Route
 *
 *  Copyright (C) 2018  Claire Xenia Wolf <claire@yosyshq.com>
 *  Copyright (C) 2018  gatecat <gatecat@ds0.me>
 *  Copyright (C) 2018  Serge Bazanski <q3k@q3k.org>
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
#include "bitstream.h"
#include <cctype>
#include <vector>
#include "cells.h"
#include "log.h"
#include "util.h"

NEXTPNR_NAMESPACE_BEGIN

inline TileType tile_at(const Context *ctx, int x, int y)
{
    return ctx->chip_info->tile_grid[y * ctx->chip_info->width + x];
}

const ConfigEntryPOD &find_config(const TileInfoPOD &tile, const std::string &name)
{
    for (auto &entry : tile.entries) {
        if (std::string(entry.name.get()) == name) {
            return entry;
        }
    }
    NPNR_ASSERT_FALSE_STR("unable to find config bit " + name);
}

std::tuple<int8_t, int8_t, int8_t> get_ieren(const BitstreamInfoPOD &bi, int8_t x, int8_t y, int8_t z)
{
    for (auto &ie : bi.ierens) {
        if (ie.iox == x && ie.ioy == y && ie.ioz == z) {
            return std::make_tuple(ie.ierx, ie.iery, ie.ierz);
        }
    }
    // No pin at this location
    return std::make_tuple(-1, -1, -1);
};

bool get_config(const TileInfoPOD &ti, std::vector<std::vector<int8_t>> &tile_cfg, const std::string &name,
                int index = -1)
{
    const ConfigEntryPOD &cfg = find_config(ti, name);
    if (index == -1) {
        for (auto &bit : cfg.bits) {
            return tile_cfg.at(bit.row).at(bit.col);
        }
    } else {
        return tile_cfg.at(cfg.bits[index].row).at(cfg.bits[index].col);
    }
    return false;
}

void set_config(const TileInfoPOD &ti, std::vector<std::vector<int8_t>> &tile_cfg, const std::string &name, bool value,
                int index = -1)
{
    const ConfigEntryPOD &cfg = find_config(ti, name);
    if (index == -1) {
        for (auto &bit : cfg.bits) {
            int8_t &cbit = tile_cfg.at(bit.row).at(bit.col);
            if (cbit && !value)
                log_error("clearing already set config bit %s\n", name.c_str());
            cbit = value;
        }
    } else {
        int8_t &cbit = tile_cfg.at(cfg.bits[index].row).at(cfg.bits[index].col);
        cbit = value;
        if (cbit && !value)
            log_error("clearing already set config bit %s[%d]\n", name.c_str(), index);
    }
}

// Set an IE_{EN,REN} logical bit in a tile config. Logical means enabled.
// On {HX,LP}1K devices these bits are active low, so we need to invert them.
void set_ie_bit_logical(const Context *ctx, const TileInfoPOD &ti, std::vector<std::vector<int8_t>> &tile_cfg,
                        const std::string &name, bool value)
{
    if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
        set_config(ti, tile_cfg, name, !value);
    } else {
        set_config(ti, tile_cfg, name, value);
    }
}

int get_param_or_def(const Context *ctx, const CellInfo *cell, const IdString param, int defval = 0)
{
    auto found = cell->params.find(param);
    if (found != cell->params.end()) {
        if (found->second.is_string)
            log_error("expected numeric value for parameter '%s' on cell '%s'\n", param.c_str(ctx),
                      cell->name.c_str(ctx));
        return found->second.as_int64();
    } else
        return defval;
}

std::string get_param_str_or_def(const CellInfo *cell, const IdString param, std::string defval = "")
{
    auto found = cell->params.find(param);
    if (found != cell->params.end())
        return found->second.as_string();
    else
        return defval;
}

char get_hexdigit(int i) { return std::string("0123456789ABCDEF").at(i); }

static const BelConfigPOD &get_ec_config(const ChipInfoPOD *chip, BelId bel)
{
    for (auto &cfg : chip->bel_config) {
        if (cfg.bel_index == bel.index)
            return cfg;
    }
    NPNR_ASSERT_FALSE("failed to find bel config");
}

typedef std::vector<std::vector<std::vector<std::vector<int8_t>>>> chipconfig_t;

static bool has_ec_cbit(const BelConfigPOD &cell_cbits, std::string name)
{
    for (auto &cbit : cell_cbits.entries) {
        if (cbit.entry_name.get() == name)
            return true;
    }
    return false;
}

static void set_ec_cbit(chipconfig_t &config, const Context *ctx, const BelConfigPOD &cell_cbits, std::string name,
                        bool value, std::string prefix)
{
    const ChipInfoPOD *chip = ctx->chip_info;

    for (auto &cbit : cell_cbits.entries) {
        if (cbit.entry_name.get() == name) {
            const auto &ti = chip->bits_info->tiles_nonrouting[tile_at(ctx, cbit.x, cbit.y)];
            set_config(ti, config.at(cbit.y).at(cbit.x), prefix + cbit.cbit_name.get(), value);
            return;
        }
    }
    NPNR_ASSERT_FALSE_STR("failed to config extra cell config bit " + name);
}

void configure_extra_cell(chipconfig_t &config, const Context *ctx, CellInfo *cell,
                          const std::vector<std::pair<std::string, int>> &params, bool string_style, std::string prefix)
{
    const ChipInfoPOD *chip = ctx->chip_info;
    const auto &bc = get_ec_config(chip, cell->bel);
    for (auto p : params) {
        std::vector<bool> value;
        if (string_style) {
            // Lattice's weird string style params, not sure if
            // prefixes other than 0b should be supported, only 0b features in docs
            if (cell->params.count(ctx->id(p.first)) && !cell->params.at(ctx->id(p.first)).is_string)
                log_error("expected configuration string starting with '0b' for parameter '%s' on cell '%s'\n",
                          p.first.c_str(), cell->name.c_str(ctx));
            std::string raw = get_param_str_or_def(cell, ctx->id(p.first), "0b0");
            if (raw.substr(0, 2) != "0b")
                log_error("expected configuration string starting with '0b' for parameter '%s' on cell '%s'\n",
                          p.first.c_str(), cell->name.c_str(ctx));
            raw = raw.substr(2);
            value.resize(raw.length());
            for (int i = 0; i < (int)raw.length(); i++) {
                if (raw[i] == '1') {
                    value[(raw.length() - 1) - i] = 1;
                } else {
                    assert(raw[i] == '0');
                    value[(raw.length() - 1) - i] = 0;
                }
            }
        } else {
            int ival;
            try {
                ival = get_param_or_def(ctx, cell, ctx->id(p.first), 0);
            } catch (std::exception &e) {
                log_error("expected numeric value for parameter '%s' on cell '%s'\n", p.first.c_str(),
                          cell->name.c_str(ctx));
            }

            for (int i = 0; i < p.second; i++)
                value.push_back((ival >> i) & 0x1);
        }

        value.resize(p.second);
        if ((p.second == 1) || !has_ec_cbit(bc, p.first + "_0")) {
            set_ec_cbit(config, ctx, bc, p.first, value.at(0), prefix);
        } else {
            for (int i = 0; i < p.second; i++) {
                set_ec_cbit(config, ctx, bc, p.first + "_" + std::to_string(i), value.at(i), prefix);
            }
        }
    }
}

std::string tagTileType(TileType &tile)
{
    if (tile == TILE_NONE)
        return "";
    switch (tile) {
    case TILE_LOGIC:
        return ".logic_tile";
        break;
    case TILE_IO:
        return ".io_tile";
        break;
    case TILE_RAMB:
        return ".ramb_tile";
        break;
    case TILE_RAMT:
        return ".ramt_tile";
        break;
    case TILE_DSP0:
        return ".dsp0_tile";
        break;
    case TILE_DSP1:
        return ".dsp1_tile";
        break;
    case TILE_DSP2:
        return ".dsp2_tile";
        break;
    case TILE_DSP3:
        return ".dsp3_tile";
        break;
    case TILE_IPCON:
        return ".ipcon_tile";
        break;
    default:
        NPNR_ASSERT(false);
    }
}

static BelPin get_one_bel_pin(const Context *ctx, WireId wire)
{
    auto pins = ctx->getWireBelPins(wire);
    NPNR_ASSERT(pins.begin() != pins.end());
    return *pins.begin();
}

// Permute LUT init value given map (LUT input -> ext input)
unsigned permute_lut(unsigned orig_init, const dict<int, int> &input_permute)
{
    unsigned new_init = 0;

    for (int i = 0; i < 16; i++) {
        int permute_address = 0;
        for (int j = 0; j < 4; j++) {
            if ((i >> j) & 0x1)
                permute_address |= (1 << input_permute.at(j));
        }
        if ((orig_init >> i) & 0x1) {
            new_init |= (1 << permute_address);
        }
    }

    return new_init;
}

void write_asc(const Context *ctx, std::ostream &out)
{

    static const std::vector<int> lut_perm = {
            4, 14, 15, 5, 6, 16, 17, 7, 3, 13, 12, 2, 1, 11, 10, 0,
    };

    // [y][x][row][col]
    const ChipInfoPOD &ci = *ctx->chip_info;
    const BitstreamInfoPOD &bi = *ci.bits_info;
    chipconfig_t config;
    config.resize(ci.height);
    for (int y = 0; y < ci.height; y++) {
        config.at(y).resize(ci.width);
        for (int x = 0; x < ci.width; x++) {
            TileType tile = tile_at(ctx, x, y);
            int rows = bi.tiles_nonrouting[tile].rows;
            int cols = bi.tiles_nonrouting[tile].cols;
            config.at(y).at(x).resize(rows, std::vector<int8_t>(cols));
        }
    }

    std::vector<std::tuple<int, int, int>> extra_bits;

    out << ".comment from next-pnr" << std::endl;

    switch (ctx->args.type) {
    case ArchArgs::LP384:
        out << ".device 384" << std::endl;
        break;
    case ArchArgs::HX1K:
    case ArchArgs::LP1K:
        out << ".device 1k" << std::endl;
        break;
    case ArchArgs::HX4K:
    case ArchArgs::LP4K:
    case ArchArgs::HX8K:
    case ArchArgs::LP8K:
        out << ".device 8k" << std::endl;
        break;
    case ArchArgs::UP3K:
    case ArchArgs::UP5K:
        out << ".device 5k" << std::endl;
        break;
    case ArchArgs::U1K:
    case ArchArgs::U2K:
    case ArchArgs::U4K:
        out << ".device u4k" << std::endl;
        break;
    default:
        NPNR_ASSERT_FALSE("unsupported device type\n");
    }
    // Set pips
    for (auto pip : ctx->getPips()) {
        if (ctx->pip_to_net[pip.index] != nullptr) {
            const PipInfoPOD &pi = ci.pip_data[pip.index];
            const SwitchInfoPOD &swi = bi.switches[pi.switch_index];
            int sw_bel_idx = swi.bel;
            if (sw_bel_idx >= 0) {
                const BelInfoPOD &beli = ci.bel_data[sw_bel_idx];
                const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_LOGIC];
                BelId sw_bel;
                sw_bel.index = sw_bel_idx;
                NPNR_ASSERT(ctx->getBelType(sw_bel) == id_ICESTORM_LC);

                if (ci.wire_data[ctx->getPipDstWire(pip).index].type == WireInfoPOD::WIRE_TYPE_LUTFF_IN_LUT)
                    continue; // Permutation pips
                BelPin output = get_one_bel_pin(ctx, ctx->getPipDstWire(pip));
                NPNR_ASSERT(output.bel == sw_bel && output.pin == id_O);
                unsigned lut_init;

                WireId permWire;
                for (auto permPip : ctx->getPipsUphill(ctx->getPipSrcWire(pip))) {
                    if (ctx->getBoundPipNet(permPip) != nullptr) {
                        permWire = ctx->getPipSrcWire(permPip);
                    }
                }
                NPNR_ASSERT(permWire != WireId());
                std::string dName = ci.wire_data[permWire.index].name.get();

                switch (dName.back()) {
                case '0':
                    lut_init = 2;
                    break;
                case '1':
                    lut_init = 4;
                    break;
                case '2':
                    lut_init = 16;
                    break;
                case '3':
                    lut_init = 256;
                    break;
                default:
                    NPNR_ASSERT_FALSE("bad feedthru LUT input");
                }
                std::vector<bool> lc(20, false);
                for (int i = 0; i < 16; i++) {
                    if ((lut_init >> i) & 0x1)
                        lc.at(lut_perm.at(i)) = true;
                }

                for (int i = 0; i < 20; i++)
                    set_config(ti, config.at(beli.y).at(beli.x), "LC_" + std::to_string(beli.z), lc.at(i), i);
            } else {
                for (int i = 0; i < swi.num_bits; i++) {
                    bool val = (pi.switch_mask & (1 << ((swi.num_bits - 1) - i))) != 0;
                    int8_t &cbit = config.at(swi.y).at(swi.x).at(swi.cbits[i].row).at(swi.cbits[i].col);
                    if (bool(cbit) != 0)
                        NPNR_ASSERT(false);
                    cbit = val;
                }
            }
        }
    }

    // Scan for PLL and collects the affected SB_IOs
    pool<Loc> sb_io_used_by_pll_out;
    pool<Loc> sb_io_used_by_pll_pad;

    for (auto &cell : ctx->cells) {
        if (cell.second->type != id_ICESTORM_PLL)
            continue;

        // Collect all locations matching an PLL output port
        //  note: It doesn't matter if the port is connected or not, or if fabric/global
        //        is used. As long as it's a PLL type for which the port exists, the SB_IO
        //        is not available and must be configured for PLL mode
        const std::vector<IdString> ports = {id_PLLOUT_A, id_PLLOUT_B};
        for (auto &port : ports) {
            // If the output is not enabled in this mode, ignore it
            if (port == id_PLLOUT_B && !is_sb_pll40_dual(ctx, cell.second.get()))
                continue;

            // Get IO Bel that this PLL port goes through by finding sibling
            // Bel driving the same wire via PIN_D_IN_0.
            auto wire = ctx->getBelPinWire(cell.second->bel, port);
            BelId io_bel;
            for (auto pin : ctx->getWireBelPins(wire)) {
                if (pin.pin == id_D_IN_0) {
                    io_bel = pin.bel;
                    break;
                }
            }
            NPNR_ASSERT(io_bel.index != -1);
            auto io_bel_loc = ctx->getBelLocation(io_bel);

            // Mark this SB_IO as being used by a PLL output path
            sb_io_used_by_pll_out.insert(io_bel_loc);

            // If this is a PAD PLL, and this is the 'PLLOUT_A' port, then the same SB_IO is also PAD
            if (port == id_PLLOUT_A && is_sb_pll40_pad(ctx, cell.second.get()))
                sb_io_used_by_pll_pad.insert(io_bel_loc);
        }
    }

    // Set logic cell config
    for (auto &cell : ctx->cells) {

        BelId bel = cell.second.get()->bel;
        if (bel == BelId()) {
            std::cout << "Found unplaced cell " << cell.first.str(ctx) << " while generating bitstream!" << std::endl;
            continue;
        }
        if (cell.second->type == id_ICESTORM_LC) {
            const BelInfoPOD &beli = ci.bel_data[bel.index];
            int x = beli.x, y = beli.y, z = beli.z;
            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_LOGIC];
            unsigned lut_init = get_param_or_def(ctx, cell.second.get(), id_LUT_INIT);
            bool neg_clk = get_param_or_def(ctx, cell.second.get(), id_NEG_CLK);
            bool dff_enable = get_param_or_def(ctx, cell.second.get(), id_DFF_ENABLE);
            bool async_sr = get_param_or_def(ctx, cell.second.get(), id_ASYNC_SR);
            bool set_noreset = get_param_or_def(ctx, cell.second.get(), id_SET_NORESET);
            bool carry_enable = get_param_or_def(ctx, cell.second.get(), id_CARRY_ENABLE);
            std::vector<bool> lc(20, false);

            // Discover permutation
            dict<int, int> input_perm;
            std::set<int> unused;
            for (int i = 0; i < 4; i++)
                unused.insert(i);
            for (int i = 0; i < 4; i++) {
                WireId lut_wire = ctx->getBelPinWire(bel, IdString(ID_I0 + i));
                for (auto pip : ctx->getPipsUphill(lut_wire)) {
                    if (ctx->getBoundPipNet(pip) != nullptr) {
                        std::string name = ci.wire_data[ctx->getPipSrcWire(pip).index].name.get();
                        switch (name.back()) {
                        case '0':
                            input_perm[i] = 0;
                            unused.erase(0);
                            break;
                        case '1':
                            input_perm[i] = 1;
                            unused.erase(1);
                            break;
                        case '2':
                            input_perm[i] = 2;
                            unused.erase(2);
                            break;
                        case '3':
                            input_perm[i] = 3;
                            unused.erase(3);
                            break;
                        default:
                            NPNR_ASSERT_FALSE("failed to determine LUT permutation");
                        }
                        break;
                    }
                }
            }
            for (int i = 0; i < 4; i++) {
                if (!input_perm.count(i)) {
                    NPNR_ASSERT(!unused.empty());
                    input_perm[i] = *(unused.begin());
                    unused.erase(input_perm[i]);
                }
            }
            lut_init = permute_lut(lut_init, input_perm);
            for (int i = 0; i < 16; i++) {
                if ((lut_init >> i) & 0x1)
                    lc.at(lut_perm.at(i)) = true;
            }
            lc.at(8) = carry_enable;
            lc.at(9) = dff_enable;
            lc.at(18) = set_noreset;
            lc.at(19) = async_sr;

            for (int i = 0; i < 20; i++)
                set_config(ti, config.at(y).at(x), "LC_" + std::to_string(z), lc.at(i), i);
            if (dff_enable)
                set_config(ti, config.at(y).at(x), "NegClk", neg_clk);

            bool carry_const = get_param_or_def(ctx, cell.second.get(), id_CIN_CONST);
            bool carry_set = get_param_or_def(ctx, cell.second.get(), id_CIN_SET);
            if (carry_const) {
                if (!ctx->force)
                    NPNR_ASSERT(z == 0);
                set_config(ti, config.at(y).at(x), "CarryInSet", carry_set);
            }
        } else if (cell.second->type == id_SB_IO) {
            const BelInfoPOD &beli = ci.bel_data[bel.index];
            int x = beli.x, y = beli.y, z = beli.z;
            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];
            unsigned pin_type = get_param_or_def(ctx, cell.second.get(), id_PIN_TYPE);
            bool neg_trigger = get_param_or_def(ctx, cell.second.get(), id_NEG_TRIGGER);
            bool pullup = get_param_or_def(ctx, cell.second.get(), id_PULLUP);
            bool lvds = cell.second->ioInfo.lvds;
            bool used_by_pll_out = sb_io_used_by_pll_out.count(Loc(x, y, z)) > 0;
            bool used_by_pll_pad = sb_io_used_by_pll_pad.count(Loc(x, y, z)) > 0;

            for (int i = used_by_pll_out ? 2 : 0; i < 6; i++) {
                bool val = (pin_type >> i) & 0x01;
                set_config(ti, config.at(y).at(x), "IOB_" + std::to_string(z) + ".PINTYPE_" + std::to_string(i), val);
            }
            set_config(ti, config.at(y).at(x), "NegClk", neg_trigger);

            bool input_en = false;
            if ((ctx->wire_to_net[ctx->getBelPinWire(bel, id_D_IN_0).index] != nullptr) ||
                (ctx->wire_to_net[ctx->getBelPinWire(bel, id_D_IN_1).index] != nullptr)) {
                input_en = true;
            }
            input_en = (input_en & !used_by_pll_out) | used_by_pll_pad;
            input_en |= cell.second->ioInfo.global;

            if (!lvds) {
                auto ieren = get_ieren(bi, x, y, z);
                int iex, iey, iez;
                std::tie(iex, iey, iez) = ieren;
                NPNR_ASSERT(iez != -1);

                if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), !input_en);
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
                } else {
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), input_en);
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
                }

                if (ctx->args.type == ArchArgs::UP5K || ctx->args.type == ArchArgs::UP3K) {
                    std::string pullup_resistor = "100K";
                    if (cell.second->attrs.count(id_PULLUP_RESISTOR))
                        pullup_resistor = cell.second->attrs.at(id_PULLUP_RESISTOR).as_string();
                    NPNR_ASSERT(pullup_resistor == "100K" || pullup_resistor == "10K" || pullup_resistor == "6P8K" ||
                                pullup_resistor == "3P3K");
                    if (iez == 0) {
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_39",
                                   (!pullup) || (pullup_resistor != "100K"));
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_36", pullup && pullup_resistor == "3P3K");
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_37", pullup && pullup_resistor == "6P8K");
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_38", pullup && pullup_resistor == "10K");
                    } else if (iez == 1) {
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_35",
                                   (!pullup) || (pullup_resistor != "100K"));
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_32", pullup && pullup_resistor == "3P3K");
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_33", pullup && pullup_resistor == "6P8K");
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_34", pullup && pullup_resistor == "10K");
                    }
                }
            } else {
                NPNR_ASSERT(z == 0);
                // Only enable the actual LVDS buffer if input is used for something
                set_config(ti, config.at(y).at(x), "IoCtrl.LVDS", input_en);

                // Set both IO config
                for (int cz = 0; cz < 2; cz++) {
                    auto ieren = get_ieren(bi, x, y, cz);
                    int iex, iey, iez;
                    std::tie(iex, iey, iez) = ieren;
                    NPNR_ASSERT(iez != -1);

                    pullup &= !input_en; /* If input is used, force disable pullups */

                    if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), true);
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
                    } else {
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), false);
                        set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
                    }

                    if (ctx->args.type == ArchArgs::UP5K || ctx->args.type == ArchArgs::UP3K) {
                        if (iez == 0) {
                            set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_39", !pullup);
                        } else if (iez == 1) {
                            set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_35", !pullup);
                        }
                    }
                }
            }
        } else if (cell.second->type == id_SB_GB) {
            if (cell.second->gbInfo.forPadIn) {
                Loc gb_loc = ctx->getBelLocation(bel);
                for (auto &glb : ci.global_network_info) {
                    if ((gb_loc.x == glb.gb_x) && (gb_loc.y == glb.gb_y)) {
                        extra_bits.push_back(std::make_tuple(glb.pi_eb_bank, glb.pi_eb_x, glb.pi_eb_y));
                    }
                }
            }
        } else if (cell.second->type == id_ICESTORM_RAM) {
            const BelInfoPOD &beli = ci.bel_data[bel.index];
            int x = beli.x, y = beli.y;
            const TileInfoPOD &ti_ramt = bi.tiles_nonrouting[TILE_RAMT];
            const TileInfoPOD &ti_ramb = bi.tiles_nonrouting[TILE_RAMB];
            if (!(ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K)) {
                set_config(ti_ramb, config.at(y).at(x), "RamConfig.PowerUp", true);
            }
            bool negclk_r = get_param_or_def(ctx, cell.second.get(), id_NEG_CLK_R);
            bool negclk_w = get_param_or_def(ctx, cell.second.get(), id_NEG_CLK_W);
            int write_mode = get_param_or_def(ctx, cell.second.get(), id_WRITE_MODE);
            int read_mode = get_param_or_def(ctx, cell.second.get(), id_READ_MODE);
            set_config(ti_ramb, config.at(y).at(x), "NegClk", negclk_w);
            set_config(ti_ramt, config.at(y + 1).at(x), "NegClk", negclk_r);

            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_0", write_mode & 0x1);
            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_1", write_mode & 0x2);
            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_2", read_mode & 0x1);
            set_config(ti_ramt, config.at(y + 1).at(x), "RamConfig.CBIT_3", read_mode & 0x2);
        } else if (cell.second->type == id_SB_LED_DRV_CUR) {
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "LED_DRV_CUR_EN", true,
                        "IpConfig.");
        } else if (cell.second->type == id_SB_RGB_DRV) {
            const std::vector<std::pair<std::string, int>> rgb_params = {
                    {"RGB0_CURRENT", 6}, {"RGB1_CURRENT", 6}, {"RGB2_CURRENT", 6}};
            configure_extra_cell(config, ctx, cell.second.get(), rgb_params, true, std::string("IpConfig."));
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "RGB_DRV_EN", true, "IpConfig.");
        } else if (cell.second->type == id_SB_RGBA_DRV) {
            const std::vector<std::pair<std::string, int>> rgba_params = {
                    {"CURRENT_MODE", 1}, {"RGB0_CURRENT", 6}, {"RGB1_CURRENT", 6}, {"RGB2_CURRENT", 6}};
            configure_extra_cell(config, ctx, cell.second.get(), rgba_params, true, std::string("IpConfig."));
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "RGBA_DRV_EN", true, "IpConfig.");
        } else if (cell.second->type == id_SB_WARMBOOT || cell.second->type == id_ICESTORM_LFOSC ||
                   cell.second->type == id_SB_LEDDA_IP) {
            // No config needed
        } else if (cell.second->type == id_SB_I2C) {
            bool sda_in_dly = !cell.second->attrs.count(id_SDA_INPUT_DELAYED) ||
                              cell.second->attrs[id_SDA_INPUT_DELAYED].as_bool();
            bool sda_out_dly = !cell.second->attrs.count(id_SDA_OUTPUT_DELAYED) ||
                               cell.second->attrs[id_SDA_OUTPUT_DELAYED].as_bool();
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "SDA_INPUT_DELAYED", sda_in_dly,
                        "IpConfig.");
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "SDA_OUTPUT_DELAYED", sda_out_dly,
                        "IpConfig.");
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "I2C_ENABLE_0", true,
                        "IpConfig.");
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "I2C_ENABLE_1", true,
                        "IpConfig.");
        } else if (cell.second->type == id_SB_SPI) {
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "SPI_ENABLE_0", true,
                        "IpConfig.");
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "SPI_ENABLE_1", true,
                        "IpConfig.");
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "SPI_ENABLE_2", true,
                        "IpConfig.");
            set_ec_cbit(config, ctx, get_ec_config(ctx->chip_info, cell.second->bel), "SPI_ENABLE_3", true,
                        "IpConfig.");
        } else if (cell.second->type == id_ICESTORM_SPRAM) {
            const BelInfoPOD &beli = ci.bel_data[bel.index];
            int x = beli.x, y = beli.y, z = beli.z;
            NPNR_ASSERT(ctx->args.type == ArchArgs::UP5K || ctx->args.type == ArchArgs::UP3K);
            if (x == 0 && y == 0) {
                const TileInfoPOD &ti_ipcon = bi.tiles_nonrouting[TILE_IPCON];
                if (z == 1) {
                    set_config(ti_ipcon, config.at(1).at(0), "IpConfig.CBIT_0", true);
                } else if (z == 2) {
                    set_config(ti_ipcon, config.at(1).at(0), "IpConfig.CBIT_1", true);
                } else {
                    NPNR_ASSERT(false);
                }
            } else if (x == 25 && y == 0) {
                const TileInfoPOD &ti_ipcon = bi.tiles_nonrouting[TILE_IPCON];
                if (z == 3) {
                    set_config(ti_ipcon, config.at(1).at(25), "IpConfig.CBIT_0", true);
                } else if (z == 4) {
                    set_config(ti_ipcon, config.at(1).at(25), "IpConfig.CBIT_1", true);
                } else {
                    NPNR_ASSERT(false);
                }
            }
        } else if (cell.second->type == id_ICESTORM_DSP) {
            const std::vector<std::pair<std::string, int>> mac16_params = {{"C_REG", 1},
                                                                           {"A_REG", 1},
                                                                           {"B_REG", 1},
                                                                           {"D_REG", 1},
                                                                           {"TOP_8x8_MULT_REG", 1},
                                                                           {"BOT_8x8_MULT_REG", 1},
                                                                           {"PIPELINE_16x16_MULT_REG1", 1},
                                                                           {"PIPELINE_16x16_MULT_REG2", 1},
                                                                           {"TOPOUTPUT_SELECT", 2},
                                                                           {"TOPADDSUB_LOWERINPUT", 2},
                                                                           {"TOPADDSUB_UPPERINPUT", 1},
                                                                           {"TOPADDSUB_CARRYSELECT", 2},
                                                                           {"BOTOUTPUT_SELECT", 2},
                                                                           {"BOTADDSUB_LOWERINPUT", 2},
                                                                           {"BOTADDSUB_UPPERINPUT", 1},
                                                                           {"BOTADDSUB_CARRYSELECT", 2},
                                                                           {"MODE_8x8", 1},
                                                                           {"A_SIGNED", 1},
                                                                           {"B_SIGNED", 1}};
            configure_extra_cell(config, ctx, cell.second.get(), mac16_params, false, std::string("IpConfig."));
        } else if (cell.second->type == id_ICESTORM_HFOSC) {
            std::vector<std::pair<std::string, int>> hfosc_params = {{"CLKHF_DIV", 2}};
            if (ctx->args.type != ArchArgs::U4K && ctx->args.type != ArchArgs::U1K && ctx->args.type != ArchArgs::U2K)
                hfosc_params.push_back(std::pair<std::string, int>("TRIM_EN", 1));
            configure_extra_cell(config, ctx, cell.second.get(), hfosc_params, true, std::string("IpConfig."));

        } else if (cell.second->type == id_ICESTORM_PLL) {
            const std::vector<std::pair<std::string, int>> pll_params = {{"DELAY_ADJMODE_FB", 1},
                                                                         {"DELAY_ADJMODE_REL", 1},
                                                                         {"DIVF", 7},
                                                                         {"DIVQ", 3},
                                                                         {"DIVR", 4},
                                                                         {"FDA_FEEDBACK", 4},
                                                                         {"FDA_RELATIVE", 4},
                                                                         {"FEEDBACK_PATH", 3},
                                                                         {"FILTER_RANGE", 3},
                                                                         {"PLLOUT_SELECT_A", 2},
                                                                         {"PLLOUT_SELECT_B", 2},
                                                                         {"PLLTYPE", 3},
                                                                         {"SHIFTREG_DIV_MODE", 2},
                                                                         {"TEST_MODE", 1}};
            configure_extra_cell(config, ctx, cell.second.get(), pll_params, false, std::string("PLL."));

            // Configure the SB_IOs that the clock outputs are going through.
            for (auto &io_bel_loc : sb_io_used_by_pll_out) {
                // Write config.
                const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];

                // PINTYPE[1:0] == "01" passes the PLL through to the fabric.
                set_config(ti, config.at(io_bel_loc.y).at(io_bel_loc.x),
                           "IOB_" + std::to_string(io_bel_loc.z) + ".PINTYPE_1", false);
                set_config(ti, config.at(io_bel_loc.y).at(io_bel_loc.x),
                           "IOB_" + std::to_string(io_bel_loc.z) + ".PINTYPE_0", true);
            }

        } else {
            NPNR_ASSERT(false);
        }
    }
    // Set config bits in unused IO and RAM
    for (auto bel : ctx->getBels()) {
        if (ctx->bel_to_cell[bel.index] == nullptr && ctx->getBelType(bel) == id_SB_IO) {
            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];
            const BelInfoPOD &beli = ci.bel_data[bel.index];
            int x = beli.x, y = beli.y, z = beli.z;
            if (sb_io_used_by_pll_out.count(Loc(x, y, z))) {
                continue;
            }

            auto ieren = get_ieren(bi, x, y, z);
            int iex, iey, iez;
            std::tie(iex, iey, iez) = ieren;
            if (iez != -1) {
                // If IO is in LVDS pair, it will be configured by the other pair
                if (z == 1) {
                    BelId lvds0 = ctx->getBelByLocation(Loc{x, y, 0});
                    const CellInfo *lvds0cell = ctx->getBoundBelCell(lvds0);
                    if (lvds0cell != nullptr && lvds0cell->ioInfo.lvds)
                        continue;
                }
                if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), true);
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), false);
                } else {
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), false);
                    set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), false);
                }
            }
        } else if (ctx->bel_to_cell[bel.index] == nullptr && ctx->getBelType(bel) == id_ICESTORM_RAM) {
            const BelInfoPOD &beli = ci.bel_data[bel.index];
            int x = beli.x, y = beli.y;
            const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_RAMB];
            if ((ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K)) {
                set_config(ti, config.at(y).at(x), "RamConfig.PowerUp", true);
            }
        }
    }

    // Set other config bits
    for (int y = 0; y < ci.height; y++) {
        for (int x = 0; x < ci.width; x++) {
            TileType tile = tile_at(ctx, x, y);
            const TileInfoPOD &ti = bi.tiles_nonrouting[tile];

            // set all ColBufCtrl bits (FIXME)
            bool setColBufCtrl = true;
            if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
                if (tile == TILE_RAMB || tile == TILE_RAMT) {
                    setColBufCtrl = (y == 3 || y == 5 || y == 11 || y == 13);
                } else {
                    setColBufCtrl = (y == 4 || y == 5 || y == 12 || y == 13);
                }
            } else if (ctx->args.type == ArchArgs::LP8K || ctx->args.type == ArchArgs::HX8K ||
                       ctx->args.type == ArchArgs::LP4K || ctx->args.type == ArchArgs::HX4K) {
                setColBufCtrl = (y == 8 || y == 9 || y == 24 || y == 25);
            } else if (ctx->args.type == ArchArgs::UP5K || ctx->args.type == ArchArgs::UP3K) {
                setColBufCtrl = (y == 4 || y == 5 || y == 14 || y == 15 || y == 26 || y == 27);
            } else if (ctx->args.type == ArchArgs::U4K || ctx->args.type == ArchArgs::U1K ||
                       ctx->args.type == ArchArgs::U2K) {
                setColBufCtrl = (y == 4 || y == 5 || y == 16 || y == 17);
            } else if (ctx->args.type == ArchArgs::LP384) {
                setColBufCtrl = false;
            }
            if (setColBufCtrl) {
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_0", true);
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_1", true);
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_2", true);
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_3", true);
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_4", true);
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_5", true);
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_6", true);
                set_config(ti, config.at(y).at(x), "ColBufCtrl.glb_netwk_7", true);
            }

            // Weird UltraPlus bits
            if (tile == TILE_DSP0 || tile == TILE_DSP1 || tile == TILE_DSP2 || tile == TILE_DSP3 ||
                tile == TILE_IPCON) {
                if ((ctx->args.type == ArchArgs::UP5K || ctx->args.type == ArchArgs::UP3K) && x == 25 && y == 14) {
                    // Mystery bits not set in this one tile
                } else {
                    for (int lc_idx = 0; lc_idx < 8; lc_idx++) {
                        static const std::vector<int> ip_dsp_lut_perm = {
                                4, 14, 15, 5, 6, 16, 17, 7, 3, 13, 12, 2, 1, 11, 10, 0,
                        };
                        for (int i = 0; i < 16; i++)
                            set_config(ti, config.at(y).at(x), "LC_" + std::to_string(lc_idx), ((i % 8) >= 4),
                                       ip_dsp_lut_perm.at(i));
                        if (tile == TILE_IPCON)
                            set_config(ti, config.at(y).at(x),
                                       "Cascade.IPCON_LC0" + std::to_string(lc_idx) + "_inmux02_5", true);
                        else
                            set_config(ti, config.at(y).at(x),
                                       "Cascade.MULT" + std::to_string(int(tile - TILE_DSP0)) + "_LC0" +
                                               std::to_string(lc_idx) + "_inmux02_5",
                                       true);
                    }
                }
            }
        }
    }

    // Write config out
    for (int y = 0; y < ci.height; y++) {
        for (int x = 0; x < ci.width; x++) {
            TileType tile = tile_at(ctx, x, y);
            if (tile == TILE_NONE)
                continue;
            out << tagTileType(tile);
            out << " " << x << " " << y << std::endl;
            for (auto row : config.at(y).at(x)) {
                for (auto col : row) {
                    if (col == 1)
                        out << "1";
                    else
                        out << "0";
                }
                out << std::endl;
            }
            out << std::endl;
        }
    }

    // Write RAM init data
    for (auto &cell : ctx->cells) {
        if (cell.second->bel != BelId()) {
            if (cell.second->type == id_ICESTORM_RAM) {
                const BelInfoPOD &beli = ci.bel_data[cell.second->bel.index];
                int x = beli.x, y = beli.y;
                out << ".ram_data " << x << " " << y << std::endl;
                for (int w = 0; w < 16; w++) {
                    std::vector<bool> bits(256);
                    Property init = get_or_default(cell.second->params, ctx->id(std::string("INIT_") + get_hexdigit(w)),
                                                   Property(0, 256));
                    for (size_t i = 0; i < init.str.size(); i++) {
                        bool val = (init.str.at(i) == Property::State::S1);
                        bits.at(i) = val;
                    }
                    for (int i = bits.size() - 4; i >= 0; i -= 4) {
                        int c = bits.at(i) + (bits.at(i + 1) << 1) + (bits.at(i + 2) << 2) + (bits.at(i + 3) << 3);
                        out << char(std::tolower(get_hexdigit(c)));
                    }
                    out << std::endl;
                }
                out << std::endl;
            }
        }
    }

    // Write extra-bits
    for (auto eb : extra_bits)
        out << ".extra_bit " << std::get<0>(eb) << " " << std::get<1>(eb) << " " << std::get<2>(eb) << std::endl;

    // Write symbols
    // const bool write_symbols = 1;
    for (auto wire : ctx->getWires()) {
        NetInfo *net = ctx->getBoundWireNet(wire);
        if (net != nullptr)
            out << ".sym " << wire.index << " " << net->name.str(ctx) << std::endl;
    }
}

void read_config(Context *ctx, std::istream &in, chipconfig_t &config)
{
    constexpr size_t line_buf_size = 65536;
    char buffer[line_buf_size];
    int tile_x = -1, tile_y = -1, line_nr = -1;

    while (1) {
        in.getline(buffer, line_buf_size);
        if (buffer[0] == '.') {
            line_nr = -1;
            const char *tok = strtok(buffer, " \t\r\n");

            if (!strcmp(tok, ".device")) {
                std::string config_device = strtok(nullptr, " \t\r\n");
                std::string expected;
                switch (ctx->args.type) {
                case ArchArgs::LP384:
                    expected = "384";
                    break;
                case ArchArgs::HX1K:
                case ArchArgs::LP1K:
                    expected = "1k";
                    break;
                case ArchArgs::HX4K:
                case ArchArgs::LP4K:
                case ArchArgs::HX8K:
                case ArchArgs::LP8K:
                    expected = "8k";
                    break;
                case ArchArgs::UP3K:
                case ArchArgs::UP5K:
                    expected = "5k";
                    break;
                case ArchArgs::U1K:
                case ArchArgs::U2K:
                case ArchArgs::U4K:
                    expected = "u4k";
                    break;
                default:
                    log_error("unsupported device type\n");
                }
                if (expected != config_device)
                    log_error("device type does not match\n");
            } else if (!strcmp(tok, ".io_tile") || !strcmp(tok, ".logic_tile") || !strcmp(tok, ".ramb_tile") ||
                       !strcmp(tok, ".ramt_tile") || !strcmp(tok, ".ipcon_tile") || !strcmp(tok, ".dsp0_tile") ||
                       !strcmp(tok, ".dsp1_tile") || !strcmp(tok, ".dsp2_tile") || !strcmp(tok, ".dsp3_tile")) {
                line_nr = 0;
                tile_x = atoi(strtok(nullptr, " \t\r\n"));
                tile_y = atoi(strtok(nullptr, " \t\r\n"));

                TileType tile = tile_at(ctx, tile_x, tile_y);
                if (tok != tagTileType(tile))
                    log_error("Wrong tile type for specified position\n");

            } else if (!strcmp(tok, ".extra_bit")) {
                /*
                int b = atoi(strtok(nullptr, " \t\r\n"));
                int x = atoi(strtok(nullptr, " \t\r\n"));
                int y = atoi(strtok(nullptr, " \t\r\n"));
                std::tuple<int, int, int> key(b, x, y);
                extra_bits.insert(key);
                */
            } else if (!strcmp(tok, ".sym")) {
                int wireIndex = atoi(strtok(nullptr, " \t\r\n"));
                const char *name = strtok(nullptr, " \t\r\n");

                IdString netName = ctx->id(name);

                if (ctx->nets.find(netName) == ctx->nets.end()) {
                    ctx->createNet(netName);
                }

                WireId wire;
                wire.index = wireIndex;
                ctx->bindWire(wire, ctx->nets.at(netName).get(), STRENGTH_WEAK);
            }
        } else if (line_nr >= 0 && strlen(buffer) > 0) {
            if (line_nr > int(config.at(tile_y).at(tile_x).size() - 1))
                log_error("Invalid data in input asc file");
            for (int i = 0; buffer[i] == '0' || buffer[i] == '1'; i++)
                config.at(tile_y).at(tile_x).at(line_nr).at(i) = (buffer[i] == '1') ? 1 : 0;
            line_nr++;
        }
        if (in.eof())
            break;
    }
}

bool read_asc(Context *ctx, std::istream &in)
{
    try {
        // [y][x][row][col]
        const ChipInfoPOD &ci = *ctx->chip_info;
        const BitstreamInfoPOD &bi = *ci.bits_info;
        chipconfig_t config;
        config.resize(ci.height);
        for (int y = 0; y < ci.height; y++) {
            config.at(y).resize(ci.width);
            for (int x = 0; x < ci.width; x++) {
                TileType tile = tile_at(ctx, x, y);
                int rows = bi.tiles_nonrouting[tile].rows;
                int cols = bi.tiles_nonrouting[tile].cols;
                config.at(y).at(x).resize(rows, std::vector<int8_t>(cols));
            }
        }
        read_config(ctx, in, config);

        // Set pips
        for (auto pip : ctx->getPips()) {
            const PipInfoPOD &pi = ci.pip_data[pip.index];
            const SwitchInfoPOD &swi = bi.switches[pi.switch_index];
            bool isUsed = true;
            for (int i = 0; i < swi.num_bits; i++) {
                bool val = (pi.switch_mask & (1 << ((swi.num_bits - 1) - i))) != 0;
                int8_t cbit = config.at(swi.y).at(swi.x).at(swi.cbits[i].row).at(swi.cbits[i].col);
                isUsed &= !(bool(cbit) ^ val);
            }
            if (isUsed) {
                NetInfo *net = ctx->wire_to_net[pi.dst];
                if (net != nullptr) {
                    WireId wire;
                    wire.index = pi.dst;
                    ctx->unbindWire(wire);
                    ctx->bindPip(pip, net, STRENGTH_WEAK);
                }
            }
        }
        for (auto bel : ctx->getBels()) {
            if (ctx->getBelType(bel) == id_ICESTORM_LC) {
                const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_LOGIC];
                const BelInfoPOD &beli = ci.bel_data[bel.index];
                int x = beli.x, y = beli.y, z = beli.z;
                std::vector<bool> lc(20, false);
                bool isUsed = false;
                for (int i = 0; i < 20; i++) {
                    lc.at(i) = get_config(ti, config.at(y).at(x), "LC_" + std::to_string(z), i);
                    isUsed |= lc.at(i);
                }
                bool neg_clk = get_config(ti, config.at(y).at(x), "NegClk");
                isUsed |= neg_clk;
                bool carry_set = get_config(ti, config.at(y).at(x), "CarryInSet");
                isUsed |= carry_set;

                if (isUsed) {
                    std::unique_ptr<CellInfo> created = create_ice_cell(ctx, id_ICESTORM_LC);
                    IdString name = created->name;
                    ctx->cells[name] = std::move(created);
                    ctx->bindBel(bel, ctx->cells[name].get(), STRENGTH_WEAK);
                    // TODO: Add port mapping to nets and assign values of properties
                }
            }
            if (ctx->getBelType(bel) == id_SB_IO) {
                const TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];
                const BelInfoPOD &beli = ci.bel_data[bel.index];
                int x = beli.x, y = beli.y, z = beli.z;
                bool isUsed = false;
                for (int i = 0; i < 6; i++) {
                    isUsed |= get_config(ti, config.at(y).at(x),
                                         "IOB_" + std::to_string(z) + ".PINTYPE_" + std::to_string(i));
                }
                bool neg_trigger = get_config(ti, config.at(y).at(x), "NegClk");
                isUsed |= neg_trigger;

                if (isUsed) {
                    std::unique_ptr<CellInfo> created = create_ice_cell(ctx, id_SB_IO);
                    IdString name = created->name;
                    ctx->cells[name] = std::move(created);
                    ctx->bindBel(bel, ctx->cells[name].get(), STRENGTH_WEAK);
                    // TODO: Add port mapping to nets and assign values of properties
                }
            }
        }
        // Add cells that are without change in initial state of configuration
        for (auto &net : ctx->nets) {
            for (auto w : net.second->wires) {
                if (w.second.pip == PipId()) {
                    WireId wire = w.first;
                    for (auto belpin : ctx->getWireBelPins(wire)) {

                        if (ctx->checkBelAvail(belpin.bel)) {
                            if (ctx->getBelType(belpin.bel) == id_ICESTORM_LC) {
                                std::unique_ptr<CellInfo> created = create_ice_cell(ctx, id_ICESTORM_LC);
                                IdString name = created->name;
                                ctx->cells[name] = std::move(created);
                                ctx->bindBel(belpin.bel, ctx->cells[name].get(), STRENGTH_WEAK);
                                // TODO: Add port mapping to nets
                            }
                            if (ctx->getBelType(belpin.bel) == id_SB_IO) {
                                std::unique_ptr<CellInfo> created = create_ice_cell(ctx, id_SB_IO);
                                IdString name = created->name;
                                ctx->cells[name] = std::move(created);
                                ctx->bindBel(belpin.bel, ctx->cells[name].get(), STRENGTH_WEAK);
                                // TODO: Add port mapping to nets
                            }
                            if (ctx->getBelType(belpin.bel) == id_SB_GB) {
                                std::unique_ptr<CellInfo> created = create_ice_cell(ctx, id_SB_GB);
                                IdString name = created->name;
                                ctx->cells[name] = std::move(created);
                                ctx->bindBel(belpin.bel, ctx->cells[name].get(), STRENGTH_WEAK);
                                // TODO: Add port mapping to nets
                            }
                            if (ctx->getBelType(belpin.bel) == id_SB_WARMBOOT) {
                                std::unique_ptr<CellInfo> created = create_ice_cell(ctx, id_SB_WARMBOOT);
                                IdString name = created->name;
                                ctx->cells[name] = std::move(created);
                                ctx->bindBel(belpin.bel, ctx->cells[name].get(), STRENGTH_WEAK);
                                // TODO: Add port mapping to nets
                            }
                            if (ctx->getBelType(belpin.bel) == id_ICESTORM_LFOSC) {
                                std::unique_ptr<CellInfo> created = create_ice_cell(ctx, id_ICESTORM_LFOSC);
                                IdString name = created->name;
                                ctx->cells[name] = std::move(created);
                                ctx->bindBel(belpin.bel, ctx->cells[name].get(), STRENGTH_WEAK);
                                // TODO: Add port mapping to nets
                            }
                        }
                    }
                }
            }
        }
        for (auto &cell : ctx->cells) {
            if (cell.second->bel != BelId()) {
                for (auto &port : cell.second->ports) {
                    IdString pin = port.first;
                    WireId wire = ctx->getBelPinWire(cell.second->bel, pin);
                    if (wire != WireId()) {
                        NetInfo *net = ctx->getBoundWireNet(wire);
                        if (net != nullptr) {
                            port.second.net = net;
                            PortRef ref;
                            ref.cell = cell.second.get();
                            ref.port = port.second.name;

                            if (port.second.type == PORT_OUT)
                                net->driver = ref;
                            else
                                net->users.push_back(ref);
                        }
                    }
                }
            }
        }
        return true;
    } catch (log_execution_error_exception) {
        return false;
    }
}
NEXTPNR_NAMESPACE_END