summaryrefslogtreecommitdiffstats
path: root/hw/exynos4210_mct.c
blob: e79cd6ac01319bba1f6ca6a04f94ed970bd10dcc (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
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
/*
 * Samsung exynos4210 Multi Core timer
 *
 * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd.
 * All rights reserved.
 *
 * Evgeny Voevodin <e.voevodin@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Global Timer:
 *
 * Consists of two timers. First represents Free Running Counter and second
 * is used to measure interval from FRC to nearest comparator.
 *
 *        0                                                           UINT64_MAX
 *        |                              timer0                             |
 *        | <-------------------------------------------------------------- |
 *        | --------------------------------------------frc---------------> |
 *        |______________________________________________|__________________|
 *                CMP0          CMP1             CMP2    |           CMP3
 *                                                     __|            |_
 *                                                     |     timer1     |
 *                                                     | -------------> |
 *                                                    frc              CMPx
 *
 * Problem: when implementing global timer as is, overflow arises.
 * next_time = cur_time + period * count;
 * period and count are 64 bits width.
 * Lets arm timer for MCT_GT_COUNTER_STEP count and update internal G_CNT
 * register during each event.
 *
 * Problem: both timers need to be implemented using MCT_XT_COUNTER_STEP because
 * local timer contains two counters: TCNT and ICNT. TCNT == 0 -> ICNT--.
 * IRQ is generated when ICNT riches zero. Implementation where TCNT == 0
 * generates IRQs suffers from too frequently events. Better to have one
 * uint64_t counter equal to TCNT*ICNT and arm ptimer.c for a minimum(TCNT*ICNT,
 * MCT_GT_COUNTER_STEP); (yes, if target tunes ICNT * TCNT to be too low values,
 * there is no way to avoid frequently events).
 */

#include "sysbus.h"
#include "qemu-timer.h"
#include "qemu-common.h"
#include "ptimer.h"

#include "exynos4210.h"

//#define DEBUG_MCT

#ifdef DEBUG_MCT
#define DPRINTF(fmt, ...) \
        do { fprintf(stdout, "MCT: [%24s:%5d] " fmt, __func__, __LINE__, \
                     ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif

#define    MCT_CFG          0x000
#define    G_CNT_L          0x100
#define    G_CNT_U          0x104
#define    G_CNT_WSTAT      0x110
#define    G_COMP0_L        0x200
#define    G_COMP0_U        0x204
#define    G_COMP0_ADD_INCR 0x208
#define    G_COMP1_L        0x210
#define    G_COMP1_U        0x214
#define    G_COMP1_ADD_INCR 0x218
#define    G_COMP2_L        0x220
#define    G_COMP2_U        0x224
#define    G_COMP2_ADD_INCR 0x228
#define    G_COMP3_L        0x230
#define    G_COMP3_U        0x234
#define    G_COMP3_ADD_INCR 0x238
#define    G_TCON           0x240
#define    G_INT_CSTAT      0x244
#define    G_INT_ENB        0x248
#define    G_WSTAT          0x24C
#define    L0_TCNTB         0x300
#define    L0_TCNTO         0x304
#define    L0_ICNTB         0x308
#define    L0_ICNTO         0x30C
#define    L0_FRCNTB        0x310
#define    L0_FRCNTO        0x314
#define    L0_TCON          0x320
#define    L0_INT_CSTAT     0x330
#define    L0_INT_ENB       0x334
#define    L0_WSTAT         0x340
#define    L1_TCNTB         0x400
#define    L1_TCNTO         0x404
#define    L1_ICNTB         0x408
#define    L1_ICNTO         0x40C
#define    L1_FRCNTB        0x410
#define    L1_FRCNTO        0x414
#define    L1_TCON          0x420
#define    L1_INT_CSTAT     0x430
#define    L1_INT_ENB       0x434
#define    L1_WSTAT         0x440

#define MCT_CFG_GET_PRESCALER(x)    ((x) & 0xFF)
#define MCT_CFG_GET_DIVIDER(x)      (1 << ((x) >> 8 & 7))

#define GET_G_COMP_IDX(offset)          (((offset) - G_COMP0_L) / 0x10)
#define GET_G_COMP_ADD_INCR_IDX(offset) (((offset) - G_COMP0_ADD_INCR) / 0x10)

#define G_COMP_L(x) (G_COMP0_L + (x) * 0x10)
#define G_COMP_U(x) (G_COMP0_U + (x) * 0x10)

#define G_COMP_ADD_INCR(x)  (G_COMP0_ADD_INCR + (x) * 0x10)

/* MCT bits */
#define G_TCON_COMP_ENABLE(x)   (1 << 2 * (x))
#define G_TCON_AUTO_ICREMENT(x) (1 << (2 * (x) + 1))
#define G_TCON_TIMER_ENABLE     (1 << 8)

#define G_INT_ENABLE(x)         (1 << (x))
#define G_INT_CSTAT_COMP(x)     (1 << (x))

#define G_CNT_WSTAT_L           1
#define G_CNT_WSTAT_U           2

#define G_WSTAT_COMP_L(x)       (1 << 4 * (x))
#define G_WSTAT_COMP_U(x)       (1 << ((4 * (x)) + 1))
#define G_WSTAT_COMP_ADDINCR(x) (1 << ((4 * (x)) + 2))
#define G_WSTAT_TCON_WRITE      (1 << 16)

#define GET_L_TIMER_IDX(offset) ((((offset) & 0xF00) - L0_TCNTB) / 0x100)
#define GET_L_TIMER_CNT_REG_IDX(offset, lt_i) \
        (((offset) - (L0_TCNTB + 0x100 * (lt_i))) >> 2)

#define L_ICNTB_MANUAL_UPDATE   (1 << 31)

#define L_TCON_TICK_START       (1)
#define L_TCON_INT_START        (1 << 1)
#define L_TCON_INTERVAL_MODE    (1 << 2)
#define L_TCON_FRC_START        (1 << 3)

#define L_INT_CSTAT_INTCNT      (1 << 0)
#define L_INT_CSTAT_FRCCNT      (1 << 1)

#define L_INT_INTENB_ICNTEIE    (1 << 0)
#define L_INT_INTENB_FRCEIE     (1 << 1)

#define L_WSTAT_TCNTB_WRITE     (1 << 0)
#define L_WSTAT_ICNTB_WRITE     (1 << 1)
#define L_WSTAT_FRCCNTB_WRITE   (1 << 2)
#define L_WSTAT_TCON_WRITE      (1 << 3)

enum LocalTimerRegCntIndexes {
    L_REG_CNT_TCNTB,
    L_REG_CNT_TCNTO,
    L_REG_CNT_ICNTB,
    L_REG_CNT_ICNTO,
    L_REG_CNT_FRCCNTB,
    L_REG_CNT_FRCCNTO,

    L_REG_CNT_AMOUNT
};

#define MCT_NIRQ                6
#define MCT_SFR_SIZE            0x444

#define MCT_GT_CMP_NUM          4

#define MCT_GT_MAX_VAL          UINT64_MAX

#define MCT_GT_COUNTER_STEP     0x100000000ULL
#define MCT_LT_COUNTER_STEP     0x100000000ULL
#define MCT_LT_CNT_LOW_LIMIT    0x100

/* global timer */
typedef struct {
    qemu_irq  irq[MCT_GT_CMP_NUM];

    struct gregs {
        uint64_t cnt;
        uint32_t cnt_wstat;
        uint32_t tcon;
        uint32_t int_cstat;
        uint32_t int_enb;
        uint32_t wstat;
        uint64_t comp[MCT_GT_CMP_NUM];
        uint32_t comp_add_incr[MCT_GT_CMP_NUM];
    } reg;

    uint64_t count;            /* Value FRC was armed with */
    int32_t curr_comp;             /* Current comparator FRC is running to */

    ptimer_state *ptimer_frc;                   /* FRC timer */

} Exynos4210MCTGT;

/* local timer */
typedef struct {
    int         id;             /* timer id */
    qemu_irq    irq;            /* local timer irq */

    struct tick_timer {
        uint32_t cnt_run;           /* cnt timer is running */
        uint32_t int_run;           /* int timer is running */

        uint32_t last_icnto;
        uint32_t last_tcnto;
        uint32_t tcntb;             /* initial value for TCNTB */
        uint32_t icntb;             /* initial value for ICNTB */

        /* for step mode */
        uint64_t    distance;       /* distance to count to the next event */
        uint64_t    progress;       /* progress when counting by steps */
        uint64_t    count;          /* count to arm timer with */

        ptimer_state *ptimer_tick;  /* timer for tick counter */
    } tick_timer;

    /* use ptimer.c to represent count down timer */

    ptimer_state *ptimer_frc;   /* timer for free running counter */

    /* registers */
    struct lregs {
        uint32_t    cnt[L_REG_CNT_AMOUNT];
        uint32_t    tcon;
        uint32_t    int_cstat;
        uint32_t    int_enb;
        uint32_t    wstat;
    } reg;

} Exynos4210MCTLT;

typedef struct Exynos4210MCTState {
    SysBusDevice busdev;
    MemoryRegion iomem;

    /* Registers */
    uint32_t    reg_mct_cfg;

    Exynos4210MCTLT l_timer[2];
    Exynos4210MCTGT g_timer;

    uint32_t    freq;                   /* all timers tick frequency, TCLK */
} Exynos4210MCTState;

/*** VMState ***/
static const VMStateDescription vmstate_tick_timer = {
    .name = "exynos4210.mct.tick_timer",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(cnt_run, struct tick_timer),
        VMSTATE_UINT32(int_run, struct tick_timer),
        VMSTATE_UINT32(last_icnto, struct tick_timer),
        VMSTATE_UINT32(last_tcnto, struct tick_timer),
        VMSTATE_UINT32(tcntb, struct tick_timer),
        VMSTATE_UINT32(icntb, struct tick_timer),
        VMSTATE_UINT64(distance, struct tick_timer),
        VMSTATE_UINT64(progress, struct tick_timer),
        VMSTATE_UINT64(count, struct tick_timer),
        VMSTATE_PTIMER(ptimer_tick, struct tick_timer),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_lregs = {
    .name = "exynos4210.mct.lregs",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32_ARRAY(cnt, struct lregs, L_REG_CNT_AMOUNT),
        VMSTATE_UINT32(tcon, struct lregs),
        VMSTATE_UINT32(int_cstat, struct lregs),
        VMSTATE_UINT32(int_enb, struct lregs),
        VMSTATE_UINT32(wstat, struct lregs),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_exynos4210_mct_lt = {
    .name = "exynos4210.mct.lt",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields = (VMStateField[]) {
        VMSTATE_INT32(id, Exynos4210MCTLT),
        VMSTATE_STRUCT(tick_timer, Exynos4210MCTLT, 0,
                vmstate_tick_timer,
                struct tick_timer),
        VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTLT),
        VMSTATE_STRUCT(reg, Exynos4210MCTLT, 0,
                vmstate_lregs,
                struct lregs),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_gregs = {
    .name = "exynos4210.mct.lregs",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT64(cnt, struct gregs),
        VMSTATE_UINT32(cnt_wstat, struct gregs),
        VMSTATE_UINT32(tcon, struct gregs),
        VMSTATE_UINT32(int_cstat, struct gregs),
        VMSTATE_UINT32(int_enb, struct gregs),
        VMSTATE_UINT32(wstat, struct gregs),
        VMSTATE_UINT64_ARRAY(comp, struct gregs, MCT_GT_CMP_NUM),
        VMSTATE_UINT32_ARRAY(comp_add_incr, struct gregs,
                MCT_GT_CMP_NUM),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_exynos4210_mct_gt = {
    .name = "exynos4210.mct.lt",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields = (VMStateField[]) {
        VMSTATE_STRUCT(reg, Exynos4210MCTGT, 0, vmstate_gregs,
                struct gregs),
        VMSTATE_UINT64(count, Exynos4210MCTGT),
        VMSTATE_INT32(curr_comp, Exynos4210MCTGT),
        VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTGT),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_exynos4210_mct_state = {
    .name = "exynos4210.mct",
    .version_id = 1,
    .minimum_version_id = 1,
    .minimum_version_id_old = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(reg_mct_cfg, Exynos4210MCTState),
        VMSTATE_STRUCT_ARRAY(l_timer, Exynos4210MCTState, 2, 0,
            vmstate_exynos4210_mct_lt, Exynos4210MCTLT),
        VMSTATE_STRUCT(g_timer, Exynos4210MCTState, 0,
            vmstate_exynos4210_mct_gt, Exynos4210MCTGT),
        VMSTATE_UINT32(freq, Exynos4210MCTState),
        VMSTATE_END_OF_LIST()
    }
};

static void exynos4210_mct_update_freq(Exynos4210MCTState *s);

/*
 * Set counter of FRC global timer.
 */
static void exynos4210_gfrc_set_count(Exynos4210MCTGT *s, uint64_t count)
{
    s->count = count;
    DPRINTF("global timer frc set count 0x%llx\n", count);
    ptimer_set_count(s->ptimer_frc, count);
}

/*
 * Get counter of FRC global timer.
 */
static uint64_t exynos4210_gfrc_get_count(Exynos4210MCTGT *s)
{
    uint64_t count = 0;
    count = ptimer_get_count(s->ptimer_frc);
    count = s->count - count;
    return s->reg.cnt + count;
}

/*
 * Stop global FRC timer
 */
static void exynos4210_gfrc_stop(Exynos4210MCTGT *s)
{
    DPRINTF("global timer frc stop\n");

    ptimer_stop(s->ptimer_frc);
}

/*
 * Start global FRC timer
 */
static void exynos4210_gfrc_start(Exynos4210MCTGT *s)
{
    DPRINTF("global timer frc start\n");

    ptimer_run(s->ptimer_frc, 1);
}

/*
 * Find next nearest Comparator. If current Comparator value equals to other
 * Comparator value, skip them both
 */
static int32_t exynos4210_gcomp_find(Exynos4210MCTState *s)
{
    int res;
    int i;
    int enabled;
    uint64_t min;
    int min_comp_i;
    uint64_t gfrc;
    uint64_t distance;
    uint64_t distance_min;
    int comp_i;

    /* get gfrc count */
    gfrc = exynos4210_gfrc_get_count(&s->g_timer);

    min = UINT64_MAX;
    distance_min = UINT64_MAX;
    comp_i = MCT_GT_CMP_NUM;
    min_comp_i = MCT_GT_CMP_NUM;
    enabled = 0;

    /* lookup for nearest comparator */
    for (i = 0; i < MCT_GT_CMP_NUM; i++) {

        if (s->g_timer.reg.tcon & G_TCON_COMP_ENABLE(i)) {

            enabled = 1;

            if (s->g_timer.reg.comp[i] > gfrc) {
                /* Comparator is upper then FRC */
                distance = s->g_timer.reg.comp[i] - gfrc;

                if (distance <= distance_min) {
                    distance_min = distance;
                    comp_i = i;
                }
            } else {
                /* Comparator is below FRC, find the smallest */

                if (s->g_timer.reg.comp[i] <= min) {
                    min = s->g_timer.reg.comp[i];
                    min_comp_i = i;
                }
            }
        }
    }

    if (!enabled) {
        /* All Comparators disabled */
        res = -1;
    } else if (comp_i < MCT_GT_CMP_NUM) {
        /* Found upper Comparator */
        res = comp_i;
    } else {
        /* All Comparators are below or equal to FRC  */
        res = min_comp_i;
    }

    DPRINTF("found comparator %d: comp 0x%llx distance 0x%llx, gfrc 0x%llx\n",
            res,
            s->g_timer.reg.comp[res],
            distance_min,
            gfrc);

    return res;
}

/*
 * Get distance to nearest Comparator
 */
static uint64_t exynos4210_gcomp_get_distance(Exynos4210MCTState *s, int32_t id)
{
    if (id == -1) {
        /* no enabled Comparators, choose max distance */
        return MCT_GT_COUNTER_STEP;
    }
    if (s->g_timer.reg.comp[id] - s->g_timer.reg.cnt < MCT_GT_COUNTER_STEP) {
        return s->g_timer.reg.comp[id] - s->g_timer.reg.cnt;
    } else {
        return MCT_GT_COUNTER_STEP;
    }
}

/*
 * Restart global FRC timer
 */
static void exynos4210_gfrc_restart(Exynos4210MCTState *s)
{
    uint64_t distance;

    exynos4210_gfrc_stop(&s->g_timer);

    s->g_timer.curr_comp = exynos4210_gcomp_find(s);

    distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);

    if (distance > MCT_GT_COUNTER_STEP || !distance) {
        distance = MCT_GT_COUNTER_STEP;
    }

    exynos4210_gfrc_set_count(&s->g_timer, distance);
    exynos4210_gfrc_start(&s->g_timer);
}

/*
 * Raise global timer CMP IRQ
 */
static void exynos4210_gcomp_raise_irq(void *opaque, uint32_t id)
{
    Exynos4210MCTGT *s = opaque;

    /* If CSTAT is pending and IRQ is enabled */
    if ((s->reg.int_cstat & G_INT_CSTAT_COMP(id)) &&
            (s->reg.int_enb & G_INT_ENABLE(id))) {
        DPRINTF("gcmp timer[%d] IRQ\n", id);
        qemu_irq_raise(s->irq[id]);
    }
}

/*
 * Lower global timer CMP IRQ
 */
static void exynos4210_gcomp_lower_irq(void *opaque, uint32_t id)
{
    Exynos4210MCTGT *s = opaque;
    qemu_irq_lower(s->irq[id]);
}

/*
 * Global timer FRC event handler.
 * Each event occurs when internal counter reaches counter + MCT_GT_COUNTER_STEP
 * Every time we arm global FRC timer to count for MCT_GT_COUNTER_STEP value
 */
static void exynos4210_gfrc_event(void *opaque)
{
    Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
    int i;
    uint64_t distance;

    DPRINTF("\n");

    s->g_timer.reg.cnt += s->g_timer.count;

    /* Process all comparators */
    for (i = 0; i < MCT_GT_CMP_NUM; i++) {

        if (s->g_timer.reg.cnt == s->g_timer.reg.comp[i]) {
            /* reached nearest comparator */

            s->g_timer.reg.int_cstat |= G_INT_CSTAT_COMP(i);

            /* Auto increment */
            if (s->g_timer.reg.tcon & G_TCON_AUTO_ICREMENT(i)) {
                s->g_timer.reg.comp[i] += s->g_timer.reg.comp_add_incr[i];
            }

            /* IRQ */
            exynos4210_gcomp_raise_irq(&s->g_timer, i);
        }
    }

    /* Reload FRC to reach nearest comparator */
    s->g_timer.curr_comp = exynos4210_gcomp_find(s);
    distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);
    if (distance > MCT_GT_COUNTER_STEP) {
        distance = MCT_GT_COUNTER_STEP;
    }
    exynos4210_gfrc_set_count(&s->g_timer, distance);

    exynos4210_gfrc_start(&s->g_timer);
}

/*
 * Get counter of FRC local timer.
 */
static uint64_t exynos4210_lfrc_get_count(Exynos4210MCTLT *s)
{
    return ptimer_get_count(s->ptimer_frc);
}

/*
 * Set counter of FRC local timer.
 */
static void exynos4210_lfrc_update_count(Exynos4210MCTLT *s)
{
    if (!s->reg.cnt[L_REG_CNT_FRCCNTB]) {
        ptimer_set_count(s->ptimer_frc, MCT_LT_COUNTER_STEP);
    } else {
        ptimer_set_count(s->ptimer_frc, s->reg.cnt[L_REG_CNT_FRCCNTB]);
    }
}

/*
 * Start local FRC timer
 */
static void exynos4210_lfrc_start(Exynos4210MCTLT *s)
{
    ptimer_run(s->ptimer_frc, 1);
}

/*
 * Stop local FRC timer
 */
static void exynos4210_lfrc_stop(Exynos4210MCTLT *s)
{
    ptimer_stop(s->ptimer_frc);
}

/*
 * Local timer free running counter tick handler
 */
static void exynos4210_lfrc_event(void *opaque)
{
    Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;

    /* local frc expired */

    DPRINTF("\n");

    s->reg.int_cstat |= L_INT_CSTAT_FRCCNT;

    /* update frc counter */
    exynos4210_lfrc_update_count(s);

    /* raise irq */
    if (s->reg.int_enb & L_INT_INTENB_FRCEIE) {
        qemu_irq_raise(s->irq);
    }

    /*  we reached here, this means that timer is enabled */
    exynos4210_lfrc_start(s);
}

static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s);
static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s);
static void exynos4210_ltick_recalc_count(struct tick_timer *s);

/*
 * Action on enabling local tick int timer
 */
static void exynos4210_ltick_int_start(struct tick_timer *s)
{
    if (!s->int_run) {
        s->int_run = 1;
    }
}

/*
 * Action on disabling local tick int timer
 */
static void exynos4210_ltick_int_stop(struct tick_timer *s)
{
    if (s->int_run) {
        s->last_icnto = exynos4210_ltick_int_get_cnto(s);
        s->int_run = 0;
    }
}

/*
 * Get count for INT timer
 */
static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s)
{
    uint32_t icnto;
    uint64_t remain;
    uint64_t count;
    uint64_t counted;
    uint64_t cur_progress;

    count = ptimer_get_count(s->ptimer_tick);
    if (count) {
        /* timer is still counting, called not from event */
        counted = s->count - ptimer_get_count(s->ptimer_tick);
        cur_progress = s->progress + counted;
    } else {
        /* timer expired earlier */
        cur_progress = s->progress;
    }

    remain = s->distance - cur_progress;

    if (!s->int_run) {
        /* INT is stopped. */
        icnto = s->last_icnto;
    } else {
        /* Both are counting */
        icnto = remain / s->tcntb;
    }

    return icnto;
}

/*
 * Start local tick cnt timer.
 */
static void exynos4210_ltick_cnt_start(struct tick_timer *s)
{
    if (!s->cnt_run) {

        exynos4210_ltick_recalc_count(s);
        ptimer_set_count(s->ptimer_tick, s->count);
        ptimer_run(s->ptimer_tick, 1);

        s->cnt_run = 1;
    }
}

/*
 * Stop local tick cnt timer.
 */
static void exynos4210_ltick_cnt_stop(struct tick_timer *s)
{
    if (s->cnt_run) {

        s->last_tcnto = exynos4210_ltick_cnt_get_cnto(s);

        if (s->int_run) {
            exynos4210_ltick_int_stop(s);
        }

        ptimer_stop(s->ptimer_tick);

        s->cnt_run = 0;
    }
}

/*
 * Get counter for CNT timer
 */
static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s)
{
    uint32_t tcnto;
    uint32_t icnto;
    uint64_t remain;
    uint64_t counted;
    uint64_t count;
    uint64_t cur_progress;

    count = ptimer_get_count(s->ptimer_tick);
    if (count) {
        /* timer is still counting, called not from event */
        counted = s->count - ptimer_get_count(s->ptimer_tick);
        cur_progress = s->progress + counted;
    } else {
        /* timer expired earlier */
        cur_progress = s->progress;
    }

    remain = s->distance - cur_progress;

    if (!s->cnt_run) {
        /* Both are stopped. */
        tcnto = s->last_tcnto;
    } else if (!s->int_run) {
        /* INT counter is stopped, progress is by CNT timer */
        tcnto = remain % s->tcntb;
    } else {
        /* Both are counting */
        icnto = remain / s->tcntb;
        if (icnto) {
            tcnto = remain % (icnto * s->tcntb);
        } else {
            tcnto = remain % s->tcntb;
        }
    }

    return tcnto;
}

/*
 * Set new values of counters for CNT and INT timers
 */
static void exynos4210_ltick_set_cntb(struct tick_timer *s, uint32_t new_cnt,
        uint32_t new_int)
{
    uint32_t cnt_stopped = 0;
    uint32_t int_stopped = 0;

    if (s->cnt_run) {
        exynos4210_ltick_cnt_stop(s);
        cnt_stopped = 1;
    }

    if (s->int_run) {
        exynos4210_ltick_int_stop(s);
        int_stopped = 1;
    }

    s->tcntb = new_cnt + 1;
    s->icntb = new_int + 1;

    if (cnt_stopped) {
        exynos4210_ltick_cnt_start(s);
    }
    if (int_stopped) {
        exynos4210_ltick_int_start(s);
    }

}

/*
 * Calculate new counter value for tick timer
 */
static void exynos4210_ltick_recalc_count(struct tick_timer *s)
{
    uint64_t to_count;

    if ((s->cnt_run && s->last_tcnto) || (s->int_run && s->last_icnto)) {
        /*
         * one or both timers run and not counted to the end;
         * distance is not passed, recalculate with last_tcnto * last_icnto
         */

        if (s->last_tcnto) {
            to_count = s->last_tcnto * s->last_icnto;
        } else {
            to_count = s->last_icnto;
        }
    } else {
        /* distance is passed, recalculate with tcnto * icnto */
        if (s->icntb) {
            s->distance = s->tcntb * s->icntb;
        } else {
            s->distance = s->tcntb;
        }

        to_count = s->distance;
        s->progress = 0;
    }

    if (to_count > MCT_LT_COUNTER_STEP) {
        /* count by step */
        s->count = MCT_LT_COUNTER_STEP;
    } else {
        s->count = to_count;
    }
}

/*
 * Initialize tick_timer
 */
static void exynos4210_ltick_timer_init(struct tick_timer *s)
{
    exynos4210_ltick_int_stop(s);
    exynos4210_ltick_cnt_stop(s);

    s->count = 0;
    s->distance = 0;
    s->progress = 0;
    s->icntb = 0;
    s->tcntb = 0;
}

/*
 * tick_timer event.
 * Raises when abstract tick_timer expires.
 */
static void exynos4210_ltick_timer_event(struct tick_timer *s)
{
    s->progress += s->count;
}

/*
 * Local timer tick counter handler.
 * Don't use reloaded timers. If timer counter = zero
 * then handler called but after handler finished no
 * timer reload occurs.
 */
static void exynos4210_ltick_event(void *opaque)
{
    Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;
    uint32_t tcnto;
    uint32_t icnto;
#ifdef DEBUG_MCT
    static uint64_t time1[2] = {0};
    static uint64_t time2[2] = {0};
#endif

    /* Call tick_timer event handler, it will update its tcntb and icntb. */
    exynos4210_ltick_timer_event(&s->tick_timer);

    /* get tick_timer cnt */
    tcnto = exynos4210_ltick_cnt_get_cnto(&s->tick_timer);

    /* get tick_timer int */
    icnto = exynos4210_ltick_int_get_cnto(&s->tick_timer);

    /* raise IRQ if needed */
    if (!icnto && s->reg.tcon & L_TCON_INT_START) {
        /* INT counter enabled and expired */

        s->reg.int_cstat |= L_INT_CSTAT_INTCNT;

        /* raise interrupt if enabled */
        if (s->reg.int_enb & L_INT_INTENB_ICNTEIE) {
#ifdef DEBUG_MCT
            time2[s->id] = qemu_get_clock_ns(vm_clock);
            DPRINTF("local timer[%d] IRQ: %llx\n", s->id,
                    time2[s->id] - time1[s->id]);
            time1[s->id] = time2[s->id];
#endif
            qemu_irq_raise(s->irq);
        }

        /* reload ICNTB */
        if (s->reg.tcon & L_TCON_INTERVAL_MODE) {
            exynos4210_ltick_set_cntb(&s->tick_timer,
                    s->reg.cnt[L_REG_CNT_TCNTB],
                    s->reg.cnt[L_REG_CNT_ICNTB]);
        }
    } else {
        /* reload TCNTB */
        if (!tcnto) {
            exynos4210_ltick_set_cntb(&s->tick_timer,
                    s->reg.cnt[L_REG_CNT_TCNTB],
                    icnto);
        }
    }

    /* start tick_timer cnt */
    exynos4210_ltick_cnt_start(&s->tick_timer);

    /* start tick_timer int */
    exynos4210_ltick_int_start(&s->tick_timer);
}

/* update timer frequency */
static void exynos4210_mct_update_freq(Exynos4210MCTState *s)
{
    uint32_t freq = s->freq;
    s->freq = 24000000 /
            ((MCT_CFG_GET_PRESCALER(s->reg_mct_cfg)+1) *
                    MCT_CFG_GET_DIVIDER(s->reg_mct_cfg));

    if (freq != s->freq) {
        DPRINTF("freq=%dHz\n", s->freq);

        /* global timer */
        ptimer_set_freq(s->g_timer.ptimer_frc, s->freq);

        /* local timer */
        ptimer_set_freq(s->l_timer[0].tick_timer.ptimer_tick, s->freq);
        ptimer_set_freq(s->l_timer[0].ptimer_frc, s->freq);
        ptimer_set_freq(s->l_timer[1].tick_timer.ptimer_tick, s->freq);
        ptimer_set_freq(s->l_timer[1].ptimer_frc, s->freq);
    }
}

/* set defaul_timer values for all fields */
static void exynos4210_mct_reset(DeviceState *d)
{
    Exynos4210MCTState *s = (Exynos4210MCTState *)d;
    uint32_t i;

    s->reg_mct_cfg = 0;

    /* global timer */
    memset(&s->g_timer.reg, 0, sizeof(s->g_timer.reg));
    exynos4210_gfrc_stop(&s->g_timer);

    /* local timer */
    memset(s->l_timer[0].reg.cnt, 0, sizeof(s->l_timer[0].reg.cnt));
    memset(s->l_timer[1].reg.cnt, 0, sizeof(s->l_timer[1].reg.cnt));
    for (i = 0; i < 2; i++) {
        s->l_timer[i].reg.int_cstat = 0;
        s->l_timer[i].reg.int_enb = 0;
        s->l_timer[i].reg.tcon = 0;
        s->l_timer[i].reg.wstat = 0;
        s->l_timer[i].tick_timer.count = 0;
        s->l_timer[i].tick_timer.distance = 0;
        s->l_timer[i].tick_timer.progress = 0;
        ptimer_stop(s->l_timer[i].ptimer_frc);

        exynos4210_ltick_timer_init(&s->l_timer[i].tick_timer);
    }

    exynos4210_mct_update_freq(s);

}

/* Multi Core Timer read */
static uint64_t exynos4210_mct_read(void *opaque, hwaddr offset,
        unsigned size)
{
    Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
    int index;
    int shift;
    uint64_t count;
    uint32_t value;
    int lt_i;

    switch (offset) {

    case MCT_CFG:
        value = s->reg_mct_cfg;
        break;

    case G_CNT_L: case G_CNT_U:
        shift = 8 * (offset & 0x4);
        count = exynos4210_gfrc_get_count(&s->g_timer);
        value = UINT32_MAX & (count >> shift);
        DPRINTF("read FRC=0x%llx\n", count);
        break;

    case G_CNT_WSTAT:
        value = s->g_timer.reg.cnt_wstat;
        break;

    case G_COMP_L(0): case G_COMP_L(1): case G_COMP_L(2): case G_COMP_L(3):
    case G_COMP_U(0): case G_COMP_U(1): case G_COMP_U(2): case G_COMP_U(3):
    index = GET_G_COMP_IDX(offset);
    shift = 8 * (offset & 0x4);
    value = UINT32_MAX & (s->g_timer.reg.comp[index] >> shift);
    break;

    case G_TCON:
        value = s->g_timer.reg.tcon;
        break;

    case G_INT_CSTAT:
        value = s->g_timer.reg.int_cstat;
        break;

    case G_INT_ENB:
        value = s->g_timer.reg.int_enb;
        break;
        break;
    case G_WSTAT:
        value = s->g_timer.reg.wstat;
        break;

    case G_COMP0_ADD_INCR: case G_COMP1_ADD_INCR:
    case G_COMP2_ADD_INCR: case G_COMP3_ADD_INCR:
        value = s->g_timer.reg.comp_add_incr[GET_G_COMP_ADD_INCR_IDX(offset)];
        break;

        /* Local timers */
    case L0_TCNTB: case L0_ICNTB: case L0_FRCNTB:
    case L1_TCNTB: case L1_ICNTB: case L1_FRCNTB:
        lt_i = GET_L_TIMER_IDX(offset);
        index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
        value = s->l_timer[lt_i].reg.cnt[index];
        break;

    case L0_TCNTO: case L1_TCNTO:
        lt_i = GET_L_TIMER_IDX(offset);

        value = exynos4210_ltick_cnt_get_cnto(&s->l_timer[lt_i].tick_timer);
        DPRINTF("local timer[%d] read TCNTO %x\n", lt_i, value);
        break;

    case L0_ICNTO: case L1_ICNTO:
        lt_i = GET_L_TIMER_IDX(offset);

        value = exynos4210_ltick_int_get_cnto(&s->l_timer[lt_i].tick_timer);
        DPRINTF("local timer[%d] read ICNTO %x\n", lt_i, value);
        break;

    case L0_FRCNTO: case L1_FRCNTO:
        lt_i = GET_L_TIMER_IDX(offset);

        value = exynos4210_lfrc_get_count(&s->l_timer[lt_i]);

        break;

    case L0_TCON: case L1_TCON:
        lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
        value = s->l_timer[lt_i].reg.tcon;
        break;

    case L0_INT_CSTAT: case L1_INT_CSTAT:
        lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
        value = s->l_timer[lt_i].reg.int_cstat;
        break;

    case L0_INT_ENB: case L1_INT_ENB:
        lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
        value = s->l_timer[lt_i].reg.int_enb;
        break;

    case L0_WSTAT: case L1_WSTAT:
        lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
        value = s->l_timer[lt_i].reg.wstat;
        break;

    default:
        hw_error("exynos4210.mct: bad read offset "
                TARGET_FMT_plx "\n", offset);
        break;
    }
    return value;
}

/* MCT write */
static void exynos4210_mct_write(void *opaque, hwaddr offset,
        uint64_t value, unsigned size)
{
    Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
    int index;  /* index in buffer which represents register set */
    int shift;
    int lt_i;
    uint64_t new_frc;
    uint32_t i;
    uint32_t old_val;
#ifdef DEBUG_MCT
    static uint32_t icntb_max[2] = {0};
    static uint32_t icntb_min[2] = {UINT32_MAX, UINT32_MAX};
    static uint32_t tcntb_max[2] = {0};
    static uint32_t tcntb_min[2] = {UINT32_MAX, UINT32_MAX};
#endif

    new_frc = s->g_timer.reg.cnt;

    switch (offset) {

    case MCT_CFG:
        s->reg_mct_cfg = value;
        exynos4210_mct_update_freq(s);
        break;

    case G_CNT_L:
    case G_CNT_U:
        if (offset == G_CNT_L) {

            DPRINTF("global timer write to reg.cntl %llx\n", value);

            new_frc = (s->g_timer.reg.cnt & (uint64_t)UINT32_MAX << 32) + value;
            s->g_timer.reg.cnt_wstat |= G_CNT_WSTAT_L;
        }
        if (offset == G_CNT_U) {

            DPRINTF("global timer write to reg.cntu %llx\n", value);

            new_frc = (s->g_timer.reg.cnt & UINT32_MAX) +
                    ((uint64_t)value << 32);
            s->g_timer.reg.cnt_wstat |= G_CNT_WSTAT_U;
        }

        s->g_timer.reg.cnt = new_frc;
        exynos4210_gfrc_restart(s);
        break;

    case G_CNT_WSTAT:
        s->g_timer.reg.cnt_wstat &= ~(value);
        break;

    case G_COMP_L(0): case G_COMP_L(1): case G_COMP_L(2): case G_COMP_L(3):
    case G_COMP_U(0): case G_COMP_U(1): case G_COMP_U(2): case G_COMP_U(3):
    index = GET_G_COMP_IDX(offset);
    shift = 8 * (offset & 0x4);
    s->g_timer.reg.comp[index] =
            (s->g_timer.reg.comp[index] &
            (((uint64_t)UINT32_MAX << 32) >> shift)) +
            (value << shift);

    DPRINTF("comparator %d write 0x%llx val << %d\n", index, value, shift);

    if (offset&0x4) {
        s->g_timer.reg.wstat |= G_WSTAT_COMP_U(index);
    } else {
        s->g_timer.reg.wstat |= G_WSTAT_COMP_L(index);
    }

    exynos4210_gfrc_restart(s);
    break;

    case G_TCON:
        old_val = s->g_timer.reg.tcon;
        s->g_timer.reg.tcon = value;
        s->g_timer.reg.wstat |= G_WSTAT_TCON_WRITE;

        DPRINTF("global timer write to reg.g_tcon %llx\n", value);

        /* Start FRC if transition from disabled to enabled */
        if ((value & G_TCON_TIMER_ENABLE) > (old_val &
                G_TCON_TIMER_ENABLE)) {
            exynos4210_gfrc_start(&s->g_timer);
        }
        if ((value & G_TCON_TIMER_ENABLE) < (old_val &
                G_TCON_TIMER_ENABLE)) {
            exynos4210_gfrc_stop(&s->g_timer);
        }

        /* Start CMP if transition from disabled to enabled */
        for (i = 0; i < MCT_GT_CMP_NUM; i++) {
            if ((value & G_TCON_COMP_ENABLE(i)) != (old_val &
                    G_TCON_COMP_ENABLE(i))) {
                exynos4210_gfrc_restart(s);
            }
        }
        break;

    case G_INT_CSTAT:
        s->g_timer.reg.int_cstat &= ~(value);
        for (i = 0; i < MCT_GT_CMP_NUM; i++) {
            if (value & G_INT_CSTAT_COMP(i)) {
                exynos4210_gcomp_lower_irq(&s->g_timer, i);
            }
        }
        break;

    case G_INT_ENB:

        /* Raise IRQ if transition from disabled to enabled and CSTAT pending */
        for (i = 0; i < MCT_GT_CMP_NUM; i++) {
            if ((value & G_INT_ENABLE(i)) > (s->g_timer.reg.tcon &
                    G_INT_ENABLE(i))) {
                if (s->g_timer.reg.int_cstat & G_INT_CSTAT_COMP(i)) {
                    exynos4210_gcomp_raise_irq(&s->g_timer, i);
                }
            }

            if ((value & G_INT_ENABLE(i)) < (s->g_timer.reg.tcon &
                    G_INT_ENABLE(i))) {
                exynos4210_gcomp_lower_irq(&s->g_timer, i);
            }
        }

        DPRINTF("global timer INT enable %llx\n", value);
        s->g_timer.reg.int_enb = value;
        break;

    case G_WSTAT:
        s->g_timer.reg.wstat &= ~(value);
        break;

    case G_COMP0_ADD_INCR: case G_COMP1_ADD_INCR:
    case G_COMP2_ADD_INCR: case G_COMP3_ADD_INCR:
        index = GET_G_COMP_ADD_INCR_IDX(offset);
        s->g_timer.reg.comp_add_incr[index] = value;
        s->g_timer.reg.wstat |= G_WSTAT_COMP_ADDINCR(index);
        break;

        /* Local timers */
    case L0_TCON: case L1_TCON:
        lt_i = GET_L_TIMER_IDX(offset);
        old_val = s->l_timer[lt_i].reg.tcon;

        s->l_timer[lt_i].reg.wstat |= L_WSTAT_TCON_WRITE;
        s->l_timer[lt_i].reg.tcon = value;

        /* Stop local CNT */
        if ((value & L_TCON_TICK_START) <
                (old_val & L_TCON_TICK_START)) {
            DPRINTF("local timer[%d] stop cnt\n", lt_i);
            exynos4210_ltick_cnt_stop(&s->l_timer[lt_i].tick_timer);
        }

        /* Stop local INT */
        if ((value & L_TCON_INT_START) <
                (old_val & L_TCON_INT_START)) {
            DPRINTF("local timer[%d] stop int\n", lt_i);
            exynos4210_ltick_int_stop(&s->l_timer[lt_i].tick_timer);
        }

        /* Start local CNT */
        if ((value & L_TCON_TICK_START) >
        (old_val & L_TCON_TICK_START)) {
            DPRINTF("local timer[%d] start cnt\n", lt_i);
            exynos4210_ltick_cnt_start(&s->l_timer[lt_i].tick_timer);
        }

        /* Start local INT */
        if ((value & L_TCON_INT_START) >
        (old_val & L_TCON_INT_START)) {
            DPRINTF("local timer[%d] start int\n", lt_i);
            exynos4210_ltick_int_start(&s->l_timer[lt_i].tick_timer);
        }

        /* Start or Stop local FRC if TCON changed */
        if ((value & L_TCON_FRC_START) >
        (s->l_timer[lt_i].reg.tcon & L_TCON_FRC_START)) {
            DPRINTF("local timer[%d] start frc\n", lt_i);
            exynos4210_lfrc_start(&s->l_timer[lt_i]);
        }
        if ((value & L_TCON_FRC_START) <
                (s->l_timer[lt_i].reg.tcon & L_TCON_FRC_START)) {
            DPRINTF("local timer[%d] stop frc\n", lt_i);
            exynos4210_lfrc_stop(&s->l_timer[lt_i]);
        }
        break;

    case L0_TCNTB: case L1_TCNTB:

        lt_i = GET_L_TIMER_IDX(offset);
        index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);

        /*
         * TCNTB is updated to internal register only after CNT expired.
         * Due to this we should reload timer to nearest moment when CNT is
         * expired and then in event handler update tcntb to new TCNTB value.
         */
        exynos4210_ltick_set_cntb(&s->l_timer[lt_i].tick_timer, value,
                s->l_timer[lt_i].tick_timer.icntb);

        s->l_timer[lt_i].reg.wstat |= L_WSTAT_TCNTB_WRITE;
        s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB] = value;

#ifdef DEBUG_MCT
        if (tcntb_min[lt_i] > value) {
            tcntb_min[lt_i] = value;
        }
        if (tcntb_max[lt_i] < value) {
            tcntb_max[lt_i] = value;
        }
        DPRINTF("local timer[%d] TCNTB write %llx; max=%x, min=%x\n",
                lt_i, value, tcntb_max[lt_i], tcntb_min[lt_i]);
#endif
        break;

    case L0_ICNTB: case L1_ICNTB:

        lt_i = GET_L_TIMER_IDX(offset);
        index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);

        s->l_timer[lt_i].reg.wstat |= L_WSTAT_ICNTB_WRITE;
        s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] = value &
                ~L_ICNTB_MANUAL_UPDATE;

        /*
         * We need to avoid too small values for TCNTB*ICNTB. If not, IRQ event
         * could raise too fast disallowing QEMU to execute target code.
         */
        if (s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] *
            s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB] < MCT_LT_CNT_LOW_LIMIT) {
            if (!s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB]) {
                s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] =
                        MCT_LT_CNT_LOW_LIMIT;
            } else {
                s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] =
                        MCT_LT_CNT_LOW_LIMIT /
                        s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB];
            }
        }

        if (value & L_ICNTB_MANUAL_UPDATE) {
            exynos4210_ltick_set_cntb(&s->l_timer[lt_i].tick_timer,
                    s->l_timer[lt_i].tick_timer.tcntb,
                    s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB]);
        }

#ifdef DEBUG_MCT
        if (icntb_min[lt_i] > value) {
            icntb_min[lt_i] = value;
        }
        if (icntb_max[lt_i] < value) {
            icntb_max[lt_i] = value;
        }
DPRINTF("local timer[%d] ICNTB write %llx; max=%x, min=%x\n\n",
        lt_i, value, icntb_max[lt_i], icntb_min[lt_i]);
#endif
break;

    case L0_FRCNTB: case L1_FRCNTB:

        lt_i = GET_L_TIMER_IDX(offset);
        index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);

        DPRINTF("local timer[%d] FRCNTB write %llx\n", lt_i, value);

        s->l_timer[lt_i].reg.wstat |= L_WSTAT_FRCCNTB_WRITE;
        s->l_timer[lt_i].reg.cnt[L_REG_CNT_FRCCNTB] = value;

        break;

    case L0_TCNTO: case L1_TCNTO:
    case L0_ICNTO: case L1_ICNTO:
    case L0_FRCNTO: case L1_FRCNTO:
        fprintf(stderr, "\n[exynos4210.mct: write to RO register "
                TARGET_FMT_plx "]\n\n", offset);
        break;

    case L0_INT_CSTAT: case L1_INT_CSTAT:
        lt_i = GET_L_TIMER_IDX(offset);

        DPRINTF("local timer[%d] CSTAT write %llx\n", lt_i, value);

        s->l_timer[lt_i].reg.int_cstat &= ~value;
        if (!s->l_timer[lt_i].reg.int_cstat) {
            qemu_irq_lower(s->l_timer[lt_i].irq);
        }
        break;

    case L0_INT_ENB: case L1_INT_ENB:
        lt_i = GET_L_TIMER_IDX(offset);
        old_val = s->l_timer[lt_i].reg.int_enb;

        /* Raise Local timer IRQ if cstat is pending */
        if ((value & L_INT_INTENB_ICNTEIE) > (old_val & L_INT_INTENB_ICNTEIE)) {
            if (s->l_timer[lt_i].reg.int_cstat & L_INT_CSTAT_INTCNT) {
                qemu_irq_raise(s->l_timer[lt_i].irq);
            }
        }

        s->l_timer[lt_i].reg.int_enb = value;

        break;

    case L0_WSTAT: case L1_WSTAT:
        lt_i = GET_L_TIMER_IDX(offset);

        s->l_timer[lt_i].reg.wstat &= ~value;
        break;

    default:
        hw_error("exynos4210.mct: bad write offset "
                TARGET_FMT_plx "\n", offset);
        break;
    }
}

static const MemoryRegionOps exynos4210_mct_ops = {
    .read = exynos4210_mct_read,
    .write = exynos4210_mct_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

/* MCT init */
static int exynos4210_mct_init(SysBusDevice *dev)
{
    int i;
    Exynos4210MCTState *s = FROM_SYSBUS(Exynos4210MCTState, dev);
    QEMUBH *bh[2];

    /* Global timer */
    bh[0] = qemu_bh_new(exynos4210_gfrc_event, s);
    s->g_timer.ptimer_frc = ptimer_init(bh[0]);
    memset(&s->g_timer.reg, 0, sizeof(struct gregs));

    /* Local timers */
    for (i = 0; i < 2; i++) {
        bh[0] = qemu_bh_new(exynos4210_ltick_event, &s->l_timer[i]);
        bh[1] = qemu_bh_new(exynos4210_lfrc_event, &s->l_timer[i]);
        s->l_timer[i].tick_timer.ptimer_tick = ptimer_init(bh[0]);
        s->l_timer[i].ptimer_frc = ptimer_init(bh[1]);
        s->l_timer[i].id = i;
    }

    /* IRQs */
    for (i = 0; i < MCT_GT_CMP_NUM; i++) {
        sysbus_init_irq(dev, &s->g_timer.irq[i]);
    }
    for (i = 0; i < 2; i++) {
        sysbus_init_irq(dev, &s->l_timer[i].irq);
    }

    memory_region_init_io(&s->iomem, &exynos4210_mct_ops, s, "exynos4210-mct",
            MCT_SFR_SIZE);
    sysbus_init_mmio(dev, &s->iomem);

    return 0;
}

static void exynos4210_mct_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = exynos4210_mct_init;
    dc->reset = exynos4210_mct_reset;
    dc->vmsd = &vmstate_exynos4210_mct_state;
}

static TypeInfo exynos4210_mct_info = {
    .name          = "exynos4210.mct",
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(Exynos4210MCTState),
    .class_init    = exynos4210_mct_class_init,
};

static void exynos4210_mct_register_types(void)
{
    type_register_static(&exynos4210_mct_info);
}

type_init(exynos4210_mct_register_types)
OpenPOWER on IntegriCloud