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slirp: fix segv when init failed
[qemu.git] / hw / timer / exynos4210_mct.c
blobae69345f0d17880f0cb6ff63aef03eaf82a78f8e
1 /*
2 * Samsung exynos4210 Multi Core timer
3 *
4 * Copyright (c) 2000 - 2011 Samsung Electronics Co., Ltd.
5 * All rights reserved.
6 *
7 * Evgeny Voevodin <e.voevodin@samsung.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17 * See the GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, see <http://www.gnu.org/licenses/>.
21 */
22
23 /*
24 * Global Timer:
25 *
26 * Consists of two timers. First represents Free Running Counter and second
27 * is used to measure interval from FRC to nearest comparator.
28 *
29 * 0 UINT64_MAX
30 * | timer0 |
31 * | <-------------------------------------------------------------- |
32 * | --------------------------------------------frc---------------> |
33 * |______________________________________________|__________________|
34 * CMP0 CMP1 CMP2 | CMP3
35 * __| |_
36 * | timer1 |
37 * | -------------> |
38 * frc CMPx
39 *
40 * Problem: when implementing global timer as is, overflow arises.
41 * next_time = cur_time + period * count;
42 * period and count are 64 bits width.
43 * Lets arm timer for MCT_GT_COUNTER_STEP count and update internal G_CNT
44 * register during each event.
45 *
46 * Problem: both timers need to be implemented using MCT_XT_COUNTER_STEP because
47 * local timer contains two counters: TCNT and ICNT. TCNT == 0 -> ICNT--.
48 * IRQ is generated when ICNT riches zero. Implementation where TCNT == 0
49 * generates IRQs suffers from too frequently events. Better to have one
50 * uint64_t counter equal to TCNT*ICNT and arm ptimer.c for a minimum(TCNT*ICNT,
51 * MCT_GT_COUNTER_STEP); (yes, if target tunes ICNT * TCNT to be too low values,
52 * there is no way to avoid frequently events).
53 */
54
55 #include "qemu/osdep.h"
56 #include "hw/sysbus.h"
57 #include "qemu/timer.h"
58 #include "qemu/main-loop.h"
59 #include "qemu-common.h"
60 #include "hw/ptimer.h"
61
62 #include "hw/arm/exynos4210.h"
63
64 //#define DEBUG_MCT
65
66 #ifdef DEBUG_MCT
67 #define DPRINTF(fmt, ...) \
68 do { fprintf(stdout, "MCT: [%24s:%5d] " fmt, __func__, __LINE__, \
69 ## __VA_ARGS__); } while (0)
70 #else
71 #define DPRINTF(fmt, ...) do {} while (0)
72 #endif
73
74 #define MCT_CFG 0x000
75 #define G_CNT_L 0x100
76 #define G_CNT_U 0x104
77 #define G_CNT_WSTAT 0x110
78 #define G_COMP0_L 0x200
79 #define G_COMP0_U 0x204
80 #define G_COMP0_ADD_INCR 0x208
81 #define G_COMP1_L 0x210
82 #define G_COMP1_U 0x214
83 #define G_COMP1_ADD_INCR 0x218
84 #define G_COMP2_L 0x220
85 #define G_COMP2_U 0x224
86 #define G_COMP2_ADD_INCR 0x228
87 #define G_COMP3_L 0x230
88 #define G_COMP3_U 0x234
89 #define G_COMP3_ADD_INCR 0x238
90 #define G_TCON 0x240
91 #define G_INT_CSTAT 0x244
92 #define G_INT_ENB 0x248
93 #define G_WSTAT 0x24C
94 #define L0_TCNTB 0x300
95 #define L0_TCNTO 0x304
96 #define L0_ICNTB 0x308
97 #define L0_ICNTO 0x30C
98 #define L0_FRCNTB 0x310
99 #define L0_FRCNTO 0x314
100 #define L0_TCON 0x320
101 #define L0_INT_CSTAT 0x330
102 #define L0_INT_ENB 0x334
103 #define L0_WSTAT 0x340
104 #define L1_TCNTB 0x400
105 #define L1_TCNTO 0x404
106 #define L1_ICNTB 0x408
107 #define L1_ICNTO 0x40C
108 #define L1_FRCNTB 0x410
109 #define L1_FRCNTO 0x414
110 #define L1_TCON 0x420
111 #define L1_INT_CSTAT 0x430
112 #define L1_INT_ENB 0x434
113 #define L1_WSTAT 0x440
114
115 #define MCT_CFG_GET_PRESCALER(x) ((x) & 0xFF)
116 #define MCT_CFG_GET_DIVIDER(x) (1 << ((x) >> 8 & 7))
117
118 #define GET_G_COMP_IDX(offset) (((offset) - G_COMP0_L) / 0x10)
119 #define GET_G_COMP_ADD_INCR_IDX(offset) (((offset) - G_COMP0_ADD_INCR) / 0x10)
120
121 #define G_COMP_L(x) (G_COMP0_L + (x) * 0x10)
122 #define G_COMP_U(x) (G_COMP0_U + (x) * 0x10)
123
124 #define G_COMP_ADD_INCR(x) (G_COMP0_ADD_INCR + (x) * 0x10)
125
126 /* MCT bits */
127 #define G_TCON_COMP_ENABLE(x) (1 << 2 * (x))
128 #define G_TCON_AUTO_ICREMENT(x) (1 << (2 * (x) + 1))
129 #define G_TCON_TIMER_ENABLE (1 << 8)
130
131 #define G_INT_ENABLE(x) (1 << (x))
132 #define G_INT_CSTAT_COMP(x) (1 << (x))
133
134 #define G_CNT_WSTAT_L 1
135 #define G_CNT_WSTAT_U 2
136
137 #define G_WSTAT_COMP_L(x) (1 << 4 * (x))
138 #define G_WSTAT_COMP_U(x) (1 << ((4 * (x)) + 1))
139 #define G_WSTAT_COMP_ADDINCR(x) (1 << ((4 * (x)) + 2))
140 #define G_WSTAT_TCON_WRITE (1 << 16)
141
142 #define GET_L_TIMER_IDX(offset) ((((offset) & 0xF00) - L0_TCNTB) / 0x100)
143 #define GET_L_TIMER_CNT_REG_IDX(offset, lt_i) \
144 (((offset) - (L0_TCNTB + 0x100 * (lt_i))) >> 2)
145
146 #define L_ICNTB_MANUAL_UPDATE (1 << 31)
147
148 #define L_TCON_TICK_START (1)
149 #define L_TCON_INT_START (1 << 1)
150 #define L_TCON_INTERVAL_MODE (1 << 2)
151 #define L_TCON_FRC_START (1 << 3)
152
153 #define L_INT_CSTAT_INTCNT (1 << 0)
154 #define L_INT_CSTAT_FRCCNT (1 << 1)
155
156 #define L_INT_INTENB_ICNTEIE (1 << 0)
157 #define L_INT_INTENB_FRCEIE (1 << 1)
158
159 #define L_WSTAT_TCNTB_WRITE (1 << 0)
160 #define L_WSTAT_ICNTB_WRITE (1 << 1)
161 #define L_WSTAT_FRCCNTB_WRITE (1 << 2)
162 #define L_WSTAT_TCON_WRITE (1 << 3)
163
164 enum LocalTimerRegCntIndexes {
165 L_REG_CNT_TCNTB,
166 L_REG_CNT_TCNTO,
167 L_REG_CNT_ICNTB,
168 L_REG_CNT_ICNTO,
169 L_REG_CNT_FRCCNTB,
170 L_REG_CNT_FRCCNTO,
171
172 L_REG_CNT_AMOUNT
173 };
174
175 #define MCT_NIRQ 6
176 #define MCT_SFR_SIZE 0x444
177
178 #define MCT_GT_CMP_NUM 4
179
180 #define MCT_GT_MAX_VAL UINT64_MAX
181
182 #define MCT_GT_COUNTER_STEP 0x100000000ULL
183 #define MCT_LT_COUNTER_STEP 0x100000000ULL
184 #define MCT_LT_CNT_LOW_LIMIT 0x100
185
186 /* global timer */
187 typedef struct {
188 qemu_irq irq[MCT_GT_CMP_NUM];
189
190 struct gregs {
191 uint64_t cnt;
192 uint32_t cnt_wstat;
193 uint32_t tcon;
194 uint32_t int_cstat;
195 uint32_t int_enb;
196 uint32_t wstat;
197 uint64_t comp[MCT_GT_CMP_NUM];
198 uint32_t comp_add_incr[MCT_GT_CMP_NUM];
199 } reg;
200
201 uint64_t count; /* Value FRC was armed with */
202 int32_t curr_comp; /* Current comparator FRC is running to */
203
204 ptimer_state *ptimer_frc; /* FRC timer */
205
206 } Exynos4210MCTGT;
207
208 /* local timer */
209 typedef struct {
210 int id; /* timer id */
211 qemu_irq irq; /* local timer irq */
212
213 struct tick_timer {
214 uint32_t cnt_run; /* cnt timer is running */
215 uint32_t int_run; /* int timer is running */
216
217 uint32_t last_icnto;
218 uint32_t last_tcnto;
219 uint32_t tcntb; /* initial value for TCNTB */
220 uint32_t icntb; /* initial value for ICNTB */
221
222 /* for step mode */
223 uint64_t distance; /* distance to count to the next event */
224 uint64_t progress; /* progress when counting by steps */
225 uint64_t count; /* count to arm timer with */
226
227 ptimer_state *ptimer_tick; /* timer for tick counter */
228 } tick_timer;
229
230 /* use ptimer.c to represent count down timer */
231
232 ptimer_state *ptimer_frc; /* timer for free running counter */
233
234 /* registers */
235 struct lregs {
236 uint32_t cnt[L_REG_CNT_AMOUNT];
237 uint32_t tcon;
238 uint32_t int_cstat;
239 uint32_t int_enb;
240 uint32_t wstat;
241 } reg;
242
243 } Exynos4210MCTLT;
244
245 #define TYPE_EXYNOS4210_MCT "exynos4210.mct"
246 #define EXYNOS4210_MCT(obj) \
247 OBJECT_CHECK(Exynos4210MCTState, (obj), TYPE_EXYNOS4210_MCT)
248
249 typedef struct Exynos4210MCTState {
250 SysBusDevice parent_obj;
251
252 MemoryRegion iomem;
253
254 /* Registers */
255 uint32_t reg_mct_cfg;
256
257 Exynos4210MCTLT l_timer[2];
258 Exynos4210MCTGT g_timer;
259
260 uint32_t freq; /* all timers tick frequency, TCLK */
261 } Exynos4210MCTState;
262
263 /*** VMState ***/
264 static const VMStateDescription vmstate_tick_timer = {
265 .name = "exynos4210.mct.tick_timer",
266 .version_id = 1,
267 .minimum_version_id = 1,
268 .fields = (VMStateField[]) {
269 VMSTATE_UINT32(cnt_run, struct tick_timer),
270 VMSTATE_UINT32(int_run, struct tick_timer),
271 VMSTATE_UINT32(last_icnto, struct tick_timer),
272 VMSTATE_UINT32(last_tcnto, struct tick_timer),
273 VMSTATE_UINT32(tcntb, struct tick_timer),
274 VMSTATE_UINT32(icntb, struct tick_timer),
275 VMSTATE_UINT64(distance, struct tick_timer),
276 VMSTATE_UINT64(progress, struct tick_timer),
277 VMSTATE_UINT64(count, struct tick_timer),
278 VMSTATE_PTIMER(ptimer_tick, struct tick_timer),
279 VMSTATE_END_OF_LIST()
280 }
281 };
282
283 static const VMStateDescription vmstate_lregs = {
284 .name = "exynos4210.mct.lregs",
285 .version_id = 1,
286 .minimum_version_id = 1,
287 .fields = (VMStateField[]) {
288 VMSTATE_UINT32_ARRAY(cnt, struct lregs, L_REG_CNT_AMOUNT),
289 VMSTATE_UINT32(tcon, struct lregs),
290 VMSTATE_UINT32(int_cstat, struct lregs),
291 VMSTATE_UINT32(int_enb, struct lregs),
292 VMSTATE_UINT32(wstat, struct lregs),
293 VMSTATE_END_OF_LIST()
294 }
295 };
296
297 static const VMStateDescription vmstate_exynos4210_mct_lt = {
298 .name = "exynos4210.mct.lt",
299 .version_id = 1,
300 .minimum_version_id = 1,
301 .fields = (VMStateField[]) {
302 VMSTATE_INT32(id, Exynos4210MCTLT),
303 VMSTATE_STRUCT(tick_timer, Exynos4210MCTLT, 0,
304 vmstate_tick_timer,
305 struct tick_timer),
306 VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTLT),
307 VMSTATE_STRUCT(reg, Exynos4210MCTLT, 0,
308 vmstate_lregs,
309 struct lregs),
310 VMSTATE_END_OF_LIST()
311 }
312 };
313
314 static const VMStateDescription vmstate_gregs = {
315 .name = "exynos4210.mct.lregs",
316 .version_id = 1,
317 .minimum_version_id = 1,
318 .fields = (VMStateField[]) {
319 VMSTATE_UINT64(cnt, struct gregs),
320 VMSTATE_UINT32(cnt_wstat, struct gregs),
321 VMSTATE_UINT32(tcon, struct gregs),
322 VMSTATE_UINT32(int_cstat, struct gregs),
323 VMSTATE_UINT32(int_enb, struct gregs),
324 VMSTATE_UINT32(wstat, struct gregs),
325 VMSTATE_UINT64_ARRAY(comp, struct gregs, MCT_GT_CMP_NUM),
326 VMSTATE_UINT32_ARRAY(comp_add_incr, struct gregs,
327 MCT_GT_CMP_NUM),
328 VMSTATE_END_OF_LIST()
329 }
330 };
331
332 static const VMStateDescription vmstate_exynos4210_mct_gt = {
333 .name = "exynos4210.mct.lt",
334 .version_id = 1,
335 .minimum_version_id = 1,
336 .fields = (VMStateField[]) {
337 VMSTATE_STRUCT(reg, Exynos4210MCTGT, 0, vmstate_gregs,
338 struct gregs),
339 VMSTATE_UINT64(count, Exynos4210MCTGT),
340 VMSTATE_INT32(curr_comp, Exynos4210MCTGT),
341 VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTGT),
342 VMSTATE_END_OF_LIST()
343 }
344 };
345
346 static const VMStateDescription vmstate_exynos4210_mct_state = {
347 .name = "exynos4210.mct",
348 .version_id = 1,
349 .minimum_version_id = 1,
350 .fields = (VMStateField[]) {
351 VMSTATE_UINT32(reg_mct_cfg, Exynos4210MCTState),
352 VMSTATE_STRUCT_ARRAY(l_timer, Exynos4210MCTState, 2, 0,
353 vmstate_exynos4210_mct_lt, Exynos4210MCTLT),
354 VMSTATE_STRUCT(g_timer, Exynos4210MCTState, 0,
355 vmstate_exynos4210_mct_gt, Exynos4210MCTGT),
356 VMSTATE_UINT32(freq, Exynos4210MCTState),
357 VMSTATE_END_OF_LIST()
358 }
359 };
360
361 static void exynos4210_mct_update_freq(Exynos4210MCTState *s);
362
363 /*
364 * Set counter of FRC global timer.
365 */
366 static void exynos4210_gfrc_set_count(Exynos4210MCTGT *s, uint64_t count)
367 {
368 s->count = count;
369 DPRINTF("global timer frc set count 0x%llx\n", count);
370 ptimer_set_count(s->ptimer_frc, count);
371 }
372
373 /*
374 * Get counter of FRC global timer.
375 */
376 static uint64_t exynos4210_gfrc_get_count(Exynos4210MCTGT *s)
377 {
378 uint64_t count = 0;
379 count = ptimer_get_count(s->ptimer_frc);
380 count = s->count - count;
381 return s->reg.cnt + count;
382 }
383
384 /*
385 * Stop global FRC timer
386 */
387 static void exynos4210_gfrc_stop(Exynos4210MCTGT *s)
388 {
389 DPRINTF("global timer frc stop\n");
390
391 ptimer_stop(s->ptimer_frc);
392 }
393
394 /*
395 * Start global FRC timer
396 */
397 static void exynos4210_gfrc_start(Exynos4210MCTGT *s)
398 {
399 DPRINTF("global timer frc start\n");
400
401 ptimer_run(s->ptimer_frc, 1);
402 }
403
404 /*
405 * Find next nearest Comparator. If current Comparator value equals to other
406 * Comparator value, skip them both
407 */
408 static int32_t exynos4210_gcomp_find(Exynos4210MCTState *s)
409 {
410 int res;
411 int i;
412 int enabled;
413 uint64_t min;
414 int min_comp_i;
415 uint64_t gfrc;
416 uint64_t distance;
417 uint64_t distance_min;
418 int comp_i;
419
420 /* get gfrc count */
421 gfrc = exynos4210_gfrc_get_count(&s->g_timer);
422
423 min = UINT64_MAX;
424 distance_min = UINT64_MAX;
425 comp_i = MCT_GT_CMP_NUM;
426 min_comp_i = MCT_GT_CMP_NUM;
427 enabled = 0;
428
429 /* lookup for nearest comparator */
430 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
431
432 if (s->g_timer.reg.tcon & G_TCON_COMP_ENABLE(i)) {
433
434 enabled = 1;
435
436 if (s->g_timer.reg.comp[i] > gfrc) {
437 /* Comparator is upper then FRC */
438 distance = s->g_timer.reg.comp[i] - gfrc;
439
440 if (distance <= distance_min) {
441 distance_min = distance;
442 comp_i = i;
443 }
444 } else {
445 /* Comparator is below FRC, find the smallest */
446
447 if (s->g_timer.reg.comp[i] <= min) {
448 min = s->g_timer.reg.comp[i];
449 min_comp_i = i;
450 }
451 }
452 }
453 }
454
455 if (!enabled) {
456 /* All Comparators disabled */
457 res = -1;
458 } else if (comp_i < MCT_GT_CMP_NUM) {
459 /* Found upper Comparator */
460 res = comp_i;
461 } else {
462 /* All Comparators are below or equal to FRC */
463 res = min_comp_i;
464 }
465
466 DPRINTF("found comparator %d: comp 0x%llx distance 0x%llx, gfrc 0x%llx\n",
467 res,
468 s->g_timer.reg.comp[res],
469 distance_min,
470 gfrc);
471
472 return res;
473 }
474
475 /*
476 * Get distance to nearest Comparator
477 */
478 static uint64_t exynos4210_gcomp_get_distance(Exynos4210MCTState *s, int32_t id)
479 {
480 if (id == -1) {
481 /* no enabled Comparators, choose max distance */
482 return MCT_GT_COUNTER_STEP;
483 }
484 if (s->g_timer.reg.comp[id] - s->g_timer.reg.cnt < MCT_GT_COUNTER_STEP) {
485 return s->g_timer.reg.comp[id] - s->g_timer.reg.cnt;
486 } else {
487 return MCT_GT_COUNTER_STEP;
488 }
489 }
490
491 /*
492 * Restart global FRC timer
493 */
494 static void exynos4210_gfrc_restart(Exynos4210MCTState *s)
495 {
496 uint64_t distance;
497
498 exynos4210_gfrc_stop(&s->g_timer);
499
500 s->g_timer.curr_comp = exynos4210_gcomp_find(s);
501
502 distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);
503
504 if (distance > MCT_GT_COUNTER_STEP || !distance) {
505 distance = MCT_GT_COUNTER_STEP;
506 }
507
508 exynos4210_gfrc_set_count(&s->g_timer, distance);
509 exynos4210_gfrc_start(&s->g_timer);
510 }
511
512 /*
513 * Raise global timer CMP IRQ
514 */
515 static void exynos4210_gcomp_raise_irq(void *opaque, uint32_t id)
516 {
517 Exynos4210MCTGT *s = opaque;
518
519 /* If CSTAT is pending and IRQ is enabled */
520 if ((s->reg.int_cstat & G_INT_CSTAT_COMP(id)) &&
521 (s->reg.int_enb & G_INT_ENABLE(id))) {
522 DPRINTF("gcmp timer[%d] IRQ\n", id);
523 qemu_irq_raise(s->irq[id]);
524 }
525 }
526
527 /*
528 * Lower global timer CMP IRQ
529 */
530 static void exynos4210_gcomp_lower_irq(void *opaque, uint32_t id)
531 {
532 Exynos4210MCTGT *s = opaque;
533 qemu_irq_lower(s->irq[id]);
534 }
535
536 /*
537 * Global timer FRC event handler.
538 * Each event occurs when internal counter reaches counter + MCT_GT_COUNTER_STEP
539 * Every time we arm global FRC timer to count for MCT_GT_COUNTER_STEP value
540 */
541 static void exynos4210_gfrc_event(void *opaque)
542 {
543 Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
544 int i;
545 uint64_t distance;
546
547 DPRINTF("\n");
548
549 s->g_timer.reg.cnt += s->g_timer.count;
550
551 /* Process all comparators */
552 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
553
554 if (s->g_timer.reg.cnt == s->g_timer.reg.comp[i]) {
555 /* reached nearest comparator */
556
557 s->g_timer.reg.int_cstat |= G_INT_CSTAT_COMP(i);
558
559 /* Auto increment */
560 if (s->g_timer.reg.tcon & G_TCON_AUTO_ICREMENT(i)) {
561 s->g_timer.reg.comp[i] += s->g_timer.reg.comp_add_incr[i];
562 }
563
564 /* IRQ */
565 exynos4210_gcomp_raise_irq(&s->g_timer, i);
566 }
567 }
568
569 /* Reload FRC to reach nearest comparator */
570 s->g_timer.curr_comp = exynos4210_gcomp_find(s);
571 distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);
572 if (distance > MCT_GT_COUNTER_STEP || !distance) {
573 distance = MCT_GT_COUNTER_STEP;
574 }
575 exynos4210_gfrc_set_count(&s->g_timer, distance);
576
577 exynos4210_gfrc_start(&s->g_timer);
578 }
579
580 /*
581 * Get counter of FRC local timer.
582 */
583 static uint64_t exynos4210_lfrc_get_count(Exynos4210MCTLT *s)
584 {
585 return ptimer_get_count(s->ptimer_frc);
586 }
587
588 /*
589 * Set counter of FRC local timer.
590 */
591 static void exynos4210_lfrc_update_count(Exynos4210MCTLT *s)
592 {
593 if (!s->reg.cnt[L_REG_CNT_FRCCNTB]) {
594 ptimer_set_count(s->ptimer_frc, MCT_LT_COUNTER_STEP);
595 } else {
596 ptimer_set_count(s->ptimer_frc, s->reg.cnt[L_REG_CNT_FRCCNTB]);
597 }
598 }
599
600 /*
601 * Start local FRC timer
602 */
603 static void exynos4210_lfrc_start(Exynos4210MCTLT *s)
604 {
605 ptimer_run(s->ptimer_frc, 1);
606 }
607
608 /*
609 * Stop local FRC timer
610 */
611 static void exynos4210_lfrc_stop(Exynos4210MCTLT *s)
612 {
613 ptimer_stop(s->ptimer_frc);
614 }
615
616 /*
617 * Local timer free running counter tick handler
618 */
619 static void exynos4210_lfrc_event(void *opaque)
620 {
621 Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;
622
623 /* local frc expired */
624
625 DPRINTF("\n");
626
627 s->reg.int_cstat |= L_INT_CSTAT_FRCCNT;
628
629 /* update frc counter */
630 exynos4210_lfrc_update_count(s);
631
632 /* raise irq */
633 if (s->reg.int_enb & L_INT_INTENB_FRCEIE) {
634 qemu_irq_raise(s->irq);
635 }
636
637 /* we reached here, this means that timer is enabled */
638 exynos4210_lfrc_start(s);
639 }
640
641 static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s);
642 static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s);
643 static void exynos4210_ltick_recalc_count(struct tick_timer *s);
644
645 /*
646 * Action on enabling local tick int timer
647 */
648 static void exynos4210_ltick_int_start(struct tick_timer *s)
649 {
650 if (!s->int_run) {
651 s->int_run = 1;
652 }
653 }
654
655 /*
656 * Action on disabling local tick int timer
657 */
658 static void exynos4210_ltick_int_stop(struct tick_timer *s)
659 {
660 if (s->int_run) {
661 s->last_icnto = exynos4210_ltick_int_get_cnto(s);
662 s->int_run = 0;
663 }
664 }
665
666 /*
667 * Get count for INT timer
668 */
669 static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s)
670 {
671 uint32_t icnto;
672 uint64_t remain;
673 uint64_t count;
674 uint64_t counted;
675 uint64_t cur_progress;
676
677 count = ptimer_get_count(s->ptimer_tick);
678 if (count) {
679 /* timer is still counting, called not from event */
680 counted = s->count - ptimer_get_count(s->ptimer_tick);
681 cur_progress = s->progress + counted;
682 } else {
683 /* timer expired earlier */
684 cur_progress = s->progress;
685 }
686
687 remain = s->distance - cur_progress;
688
689 if (!s->int_run) {
690 /* INT is stopped. */
691 icnto = s->last_icnto;
692 } else {
693 /* Both are counting */
694 icnto = remain / s->tcntb;
695 }
696
697 return icnto;
698 }
699
700 /*
701 * Start local tick cnt timer.
702 */
703 static void exynos4210_ltick_cnt_start(struct tick_timer *s)
704 {
705 if (!s->cnt_run) {
706
707 exynos4210_ltick_recalc_count(s);
708 ptimer_set_count(s->ptimer_tick, s->count);
709 ptimer_run(s->ptimer_tick, 1);
710
711 s->cnt_run = 1;
712 }
713 }
714
715 /*
716 * Stop local tick cnt timer.
717 */
718 static void exynos4210_ltick_cnt_stop(struct tick_timer *s)
719 {
720 if (s->cnt_run) {
721
722 s->last_tcnto = exynos4210_ltick_cnt_get_cnto(s);
723
724 if (s->int_run) {
725 exynos4210_ltick_int_stop(s);
726 }
727
728 ptimer_stop(s->ptimer_tick);
729
730 s->cnt_run = 0;
731 }
732 }
733
734 /*
735 * Get counter for CNT timer
736 */
737 static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s)
738 {
739 uint32_t tcnto;
740 uint32_t icnto;
741 uint64_t remain;
742 uint64_t counted;
743 uint64_t count;
744 uint64_t cur_progress;
745
746 count = ptimer_get_count(s->ptimer_tick);
747 if (count) {
748 /* timer is still counting, called not from event */
749 counted = s->count - ptimer_get_count(s->ptimer_tick);
750 cur_progress = s->progress + counted;
751 } else {
752 /* timer expired earlier */
753 cur_progress = s->progress;
754 }
755
756 remain = s->distance - cur_progress;
757
758 if (!s->cnt_run) {
759 /* Both are stopped. */
760 tcnto = s->last_tcnto;
761 } else if (!s->int_run) {
762 /* INT counter is stopped, progress is by CNT timer */
763 tcnto = remain % s->tcntb;
764 } else {
765 /* Both are counting */
766 icnto = remain / s->tcntb;
767 if (icnto) {
768 tcnto = remain % (icnto * s->tcntb);
769 } else {
770 tcnto = remain % s->tcntb;
771 }
772 }
773
774 return tcnto;
775 }
776
777 /*
778 * Set new values of counters for CNT and INT timers
779 */
780 static void exynos4210_ltick_set_cntb(struct tick_timer *s, uint32_t new_cnt,
781 uint32_t new_int)
782 {
783 uint32_t cnt_stopped = 0;
784 uint32_t int_stopped = 0;
785
786 if (s->cnt_run) {
787 exynos4210_ltick_cnt_stop(s);
788 cnt_stopped = 1;
789 }
790
791 if (s->int_run) {
792 exynos4210_ltick_int_stop(s);
793 int_stopped = 1;
794 }
795
796 s->tcntb = new_cnt + 1;
797 s->icntb = new_int + 1;
798
799 if (cnt_stopped) {
800 exynos4210_ltick_cnt_start(s);
801 }
802 if (int_stopped) {
803 exynos4210_ltick_int_start(s);
804 }
805
806 }
807
808 /*
809 * Calculate new counter value for tick timer
810 */
811 static void exynos4210_ltick_recalc_count(struct tick_timer *s)
812 {
813 uint64_t to_count;
814
815 if ((s->cnt_run && s->last_tcnto) || (s->int_run && s->last_icnto)) {
816 /*
817 * one or both timers run and not counted to the end;
818 * distance is not passed, recalculate with last_tcnto * last_icnto
819 */
820
821 if (s->last_tcnto) {
822 to_count = (uint64_t)s->last_tcnto * s->last_icnto;
823 } else {
824 to_count = s->last_icnto;
825 }
826 } else {
827 /* distance is passed, recalculate with tcnto * icnto */
828 if (s->icntb) {
829 s->distance = (uint64_t)s->tcntb * s->icntb;
830 } else {
831 s->distance = s->tcntb;
832 }
833
834 to_count = s->distance;
835 s->progress = 0;
836 }
837
838 if (to_count > MCT_LT_COUNTER_STEP) {
839 /* count by step */
840 s->count = MCT_LT_COUNTER_STEP;
841 } else {
842 s->count = to_count;
843 }
844 }
845
846 /*
847 * Initialize tick_timer
848 */
849 static void exynos4210_ltick_timer_init(struct tick_timer *s)
850 {
851 exynos4210_ltick_int_stop(s);
852 exynos4210_ltick_cnt_stop(s);
853
854 s->count = 0;
855 s->distance = 0;
856 s->progress = 0;
857 s->icntb = 0;
858 s->tcntb = 0;
859 }
860
861 /*
862 * tick_timer event.
863 * Raises when abstract tick_timer expires.
864 */
865 static void exynos4210_ltick_timer_event(struct tick_timer *s)
866 {
867 s->progress += s->count;
868 }
869
870 /*
871 * Local timer tick counter handler.
872 * Don't use reloaded timers. If timer counter = zero
873 * then handler called but after handler finished no
874 * timer reload occurs.
875 */
876 static void exynos4210_ltick_event(void *opaque)
877 {
878 Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;
879 uint32_t tcnto;
880 uint32_t icnto;
881 #ifdef DEBUG_MCT
882 static uint64_t time1[2] = {0};
883 static uint64_t time2[2] = {0};
884 #endif
885
886 /* Call tick_timer event handler, it will update its tcntb and icntb. */
887 exynos4210_ltick_timer_event(&s->tick_timer);
888
889 /* get tick_timer cnt */
890 tcnto = exynos4210_ltick_cnt_get_cnto(&s->tick_timer);
891
892 /* get tick_timer int */
893 icnto = exynos4210_ltick_int_get_cnto(&s->tick_timer);
894
895 /* raise IRQ if needed */
896 if (!icnto && s->reg.tcon & L_TCON_INT_START) {
897 /* INT counter enabled and expired */
898
899 s->reg.int_cstat |= L_INT_CSTAT_INTCNT;
900
901 /* raise interrupt if enabled */
902 if (s->reg.int_enb & L_INT_INTENB_ICNTEIE) {
903 #ifdef DEBUG_MCT
904 time2[s->id] = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
905 DPRINTF("local timer[%d] IRQ: %llx\n", s->id,
906 time2[s->id] - time1[s->id]);
907 time1[s->id] = time2[s->id];
908 #endif
909 qemu_irq_raise(s->irq);
910 }
911
912 /* reload ICNTB */
913 if (s->reg.tcon & L_TCON_INTERVAL_MODE) {
914 exynos4210_ltick_set_cntb(&s->tick_timer,
915 s->reg.cnt[L_REG_CNT_TCNTB],
916 s->reg.cnt[L_REG_CNT_ICNTB]);
917 }
918 } else {
919 /* reload TCNTB */
920 if (!tcnto) {
921 exynos4210_ltick_set_cntb(&s->tick_timer,
922 s->reg.cnt[L_REG_CNT_TCNTB],
923 icnto);
924 }
925 }
926
927 /* start tick_timer cnt */
928 exynos4210_ltick_cnt_start(&s->tick_timer);
929
930 /* start tick_timer int */
931 exynos4210_ltick_int_start(&s->tick_timer);
932 }
933
934 /* update timer frequency */
935 static void exynos4210_mct_update_freq(Exynos4210MCTState *s)
936 {
937 uint32_t freq = s->freq;
938 s->freq = 24000000 /
939 ((MCT_CFG_GET_PRESCALER(s->reg_mct_cfg)+1) *
940 MCT_CFG_GET_DIVIDER(s->reg_mct_cfg));
941
942 if (freq != s->freq) {
943 DPRINTF("freq=%dHz\n", s->freq);
944
945 /* global timer */
946 ptimer_set_freq(s->g_timer.ptimer_frc, s->freq);
947
948 /* local timer */
949 ptimer_set_freq(s->l_timer[0].tick_timer.ptimer_tick, s->freq);
950 ptimer_set_freq(s->l_timer[0].ptimer_frc, s->freq);
951 ptimer_set_freq(s->l_timer[1].tick_timer.ptimer_tick, s->freq);
952 ptimer_set_freq(s->l_timer[1].ptimer_frc, s->freq);
953 }
954 }
955
956 /* set defaul_timer values for all fields */
957 static void exynos4210_mct_reset(DeviceState *d)
958 {
959 Exynos4210MCTState *s = EXYNOS4210_MCT(d);
960 uint32_t i;
961
962 s->reg_mct_cfg = 0;
963
964 /* global timer */
965 memset(&s->g_timer.reg, 0, sizeof(s->g_timer.reg));
966 exynos4210_gfrc_stop(&s->g_timer);
967
968 /* local timer */
969 memset(s->l_timer[0].reg.cnt, 0, sizeof(s->l_timer[0].reg.cnt));
970 memset(s->l_timer[1].reg.cnt, 0, sizeof(s->l_timer[1].reg.cnt));
971 for (i = 0; i < 2; i++) {
972 s->l_timer[i].reg.int_cstat = 0;
973 s->l_timer[i].reg.int_enb = 0;
974 s->l_timer[i].reg.tcon = 0;
975 s->l_timer[i].reg.wstat = 0;
976 s->l_timer[i].tick_timer.count = 0;
977 s->l_timer[i].tick_timer.distance = 0;
978 s->l_timer[i].tick_timer.progress = 0;
979 ptimer_stop(s->l_timer[i].ptimer_frc);
980
981 exynos4210_ltick_timer_init(&s->l_timer[i].tick_timer);
982 }
983
984 exynos4210_mct_update_freq(s);
985
986 }
987
988 /* Multi Core Timer read */
989 static uint64_t exynos4210_mct_read(void *opaque, hwaddr offset,
990 unsigned size)
991 {
992 Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
993 int index;
994 int shift;
995 uint64_t count;
996 uint32_t value;
997 int lt_i;
998
999 switch (offset) {
1000
1001 case MCT_CFG:
1002 value = s->reg_mct_cfg;
1003 break;
1004
1005 case G_CNT_L: case G_CNT_U:
1006 shift = 8 * (offset & 0x4);
1007 count = exynos4210_gfrc_get_count(&s->g_timer);
1008 value = UINT32_MAX & (count >> shift);
1009 DPRINTF("read FRC=0x%llx\n", count);
1010 break;
1011
1012 case G_CNT_WSTAT:
1013 value = s->g_timer.reg.cnt_wstat;
1014 break;
1015
1016 case G_COMP_L(0): case G_COMP_L(1): case G_COMP_L(2): case G_COMP_L(3):
1017 case G_COMP_U(0): case G_COMP_U(1): case G_COMP_U(2): case G_COMP_U(3):
1018 index = GET_G_COMP_IDX(offset);
1019 shift = 8 * (offset & 0x4);
1020 value = UINT32_MAX & (s->g_timer.reg.comp[index] >> shift);
1021 break;
1022
1023 case G_TCON:
1024 value = s->g_timer.reg.tcon;
1025 break;
1026
1027 case G_INT_CSTAT:
1028 value = s->g_timer.reg.int_cstat;
1029 break;
1030
1031 case G_INT_ENB:
1032 value = s->g_timer.reg.int_enb;
1033 break;
1034 case G_WSTAT:
1035 value = s->g_timer.reg.wstat;
1036 break;
1037
1038 case G_COMP0_ADD_INCR: case G_COMP1_ADD_INCR:
1039 case G_COMP2_ADD_INCR: case G_COMP3_ADD_INCR:
1040 value = s->g_timer.reg.comp_add_incr[GET_G_COMP_ADD_INCR_IDX(offset)];
1041 break;
1042
1043 /* Local timers */
1044 case L0_TCNTB: case L0_ICNTB: case L0_FRCNTB:
1045 case L1_TCNTB: case L1_ICNTB: case L1_FRCNTB:
1046 lt_i = GET_L_TIMER_IDX(offset);
1047 index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
1048 value = s->l_timer[lt_i].reg.cnt[index];
1049 break;
1050
1051 case L0_TCNTO: case L1_TCNTO:
1052 lt_i = GET_L_TIMER_IDX(offset);
1053
1054 value = exynos4210_ltick_cnt_get_cnto(&s->l_timer[lt_i].tick_timer);
1055 DPRINTF("local timer[%d] read TCNTO %x\n", lt_i, value);
1056 break;
1057
1058 case L0_ICNTO: case L1_ICNTO:
1059 lt_i = GET_L_TIMER_IDX(offset);
1060
1061 value = exynos4210_ltick_int_get_cnto(&s->l_timer[lt_i].tick_timer);
1062 DPRINTF("local timer[%d] read ICNTO %x\n", lt_i, value);
1063 break;
1064
1065 case L0_FRCNTO: case L1_FRCNTO:
1066 lt_i = GET_L_TIMER_IDX(offset);
1067
1068 value = exynos4210_lfrc_get_count(&s->l_timer[lt_i]);
1069
1070 break;
1071
1072 case L0_TCON: case L1_TCON:
1073 lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
1074 value = s->l_timer[lt_i].reg.tcon;
1075 break;
1076
1077 case L0_INT_CSTAT: case L1_INT_CSTAT:
1078 lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
1079 value = s->l_timer[lt_i].reg.int_cstat;
1080 break;
1081
1082 case L0_INT_ENB: case L1_INT_ENB:
1083 lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
1084 value = s->l_timer[lt_i].reg.int_enb;
1085 break;
1086
1087 case L0_WSTAT: case L1_WSTAT:
1088 lt_i = ((offset & 0xF00) - L0_TCNTB) / 0x100;
1089 value = s->l_timer[lt_i].reg.wstat;
1090 break;
1091
1092 default:
1093 hw_error("exynos4210.mct: bad read offset "
1094 TARGET_FMT_plx "\n", offset);
1095 break;
1096 }
1097 return value;
1098 }
1099
1100 /* MCT write */
1101 static void exynos4210_mct_write(void *opaque, hwaddr offset,
1102 uint64_t value, unsigned size)
1103 {
1104 Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
1105 int index; /* index in buffer which represents register set */
1106 int shift;
1107 int lt_i;
1108 uint64_t new_frc;
1109 uint32_t i;
1110 uint32_t old_val;
1111 #ifdef DEBUG_MCT
1112 static uint32_t icntb_max[2] = {0};
1113 static uint32_t icntb_min[2] = {UINT32_MAX, UINT32_MAX};
1114 static uint32_t tcntb_max[2] = {0};
1115 static uint32_t tcntb_min[2] = {UINT32_MAX, UINT32_MAX};
1116 #endif
1117
1118 new_frc = s->g_timer.reg.cnt;
1119
1120 switch (offset) {
1121
1122 case MCT_CFG:
1123 s->reg_mct_cfg = value;
1124 exynos4210_mct_update_freq(s);
1125 break;
1126
1127 case G_CNT_L:
1128 case G_CNT_U:
1129 if (offset == G_CNT_L) {
1130
1131 DPRINTF("global timer write to reg.cntl %llx\n", value);
1132
1133 new_frc = (s->g_timer.reg.cnt & (uint64_t)UINT32_MAX << 32) + value;
1134 s->g_timer.reg.cnt_wstat |= G_CNT_WSTAT_L;
1135 }
1136 if (offset == G_CNT_U) {
1137
1138 DPRINTF("global timer write to reg.cntu %llx\n", value);
1139
1140 new_frc = (s->g_timer.reg.cnt & UINT32_MAX) +
1141 ((uint64_t)value << 32);
1142 s->g_timer.reg.cnt_wstat |= G_CNT_WSTAT_U;
1143 }
1144
1145 s->g_timer.reg.cnt = new_frc;
1146 exynos4210_gfrc_restart(s);
1147 break;
1148
1149 case G_CNT_WSTAT:
1150 s->g_timer.reg.cnt_wstat &= ~(value);
1151 break;
1152
1153 case G_COMP_L(0): case G_COMP_L(1): case G_COMP_L(2): case G_COMP_L(3):
1154 case G_COMP_U(0): case G_COMP_U(1): case G_COMP_U(2): case G_COMP_U(3):
1155 index = GET_G_COMP_IDX(offset);
1156 shift = 8 * (offset & 0x4);
1157 s->g_timer.reg.comp[index] =
1158 (s->g_timer.reg.comp[index] &
1159 (((uint64_t)UINT32_MAX << 32) >> shift)) +
1160 (value << shift);
1161
1162 DPRINTF("comparator %d write 0x%llx val << %d\n", index, value, shift);
1163
1164 if (offset&0x4) {
1165 s->g_timer.reg.wstat |= G_WSTAT_COMP_U(index);
1166 } else {
1167 s->g_timer.reg.wstat |= G_WSTAT_COMP_L(index);
1168 }
1169
1170 exynos4210_gfrc_restart(s);
1171 break;
1172
1173 case G_TCON:
1174 old_val = s->g_timer.reg.tcon;
1175 s->g_timer.reg.tcon = value;
1176 s->g_timer.reg.wstat |= G_WSTAT_TCON_WRITE;
1177
1178 DPRINTF("global timer write to reg.g_tcon %llx\n", value);
1179
1180 /* Start FRC if transition from disabled to enabled */
1181 if ((value & G_TCON_TIMER_ENABLE) > (old_val &
1182 G_TCON_TIMER_ENABLE)) {
1183 exynos4210_gfrc_start(&s->g_timer);
1184 }
1185 if ((value & G_TCON_TIMER_ENABLE) < (old_val &
1186 G_TCON_TIMER_ENABLE)) {
1187 exynos4210_gfrc_stop(&s->g_timer);
1188 }
1189
1190 /* Start CMP if transition from disabled to enabled */
1191 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
1192 if ((value & G_TCON_COMP_ENABLE(i)) != (old_val &
1193 G_TCON_COMP_ENABLE(i))) {
1194 exynos4210_gfrc_restart(s);
1195 }
1196 }
1197 break;
1198
1199 case G_INT_CSTAT:
1200 s->g_timer.reg.int_cstat &= ~(value);
1201 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
1202 if (value & G_INT_CSTAT_COMP(i)) {
1203 exynos4210_gcomp_lower_irq(&s->g_timer, i);
1204 }
1205 }
1206 break;
1207
1208 case G_INT_ENB:
1209
1210 /* Raise IRQ if transition from disabled to enabled and CSTAT pending */
1211 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
1212 if ((value & G_INT_ENABLE(i)) > (s->g_timer.reg.tcon &
1213 G_INT_ENABLE(i))) {
1214 if (s->g_timer.reg.int_cstat & G_INT_CSTAT_COMP(i)) {
1215 exynos4210_gcomp_raise_irq(&s->g_timer, i);
1216 }
1217 }
1218
1219 if ((value & G_INT_ENABLE(i)) < (s->g_timer.reg.tcon &
1220 G_INT_ENABLE(i))) {
1221 exynos4210_gcomp_lower_irq(&s->g_timer, i);
1222 }
1223 }
1224
1225 DPRINTF("global timer INT enable %llx\n", value);
1226 s->g_timer.reg.int_enb = value;
1227 break;
1228
1229 case G_WSTAT:
1230 s->g_timer.reg.wstat &= ~(value);
1231 break;
1232
1233 case G_COMP0_ADD_INCR: case G_COMP1_ADD_INCR:
1234 case G_COMP2_ADD_INCR: case G_COMP3_ADD_INCR:
1235 index = GET_G_COMP_ADD_INCR_IDX(offset);
1236 s->g_timer.reg.comp_add_incr[index] = value;
1237 s->g_timer.reg.wstat |= G_WSTAT_COMP_ADDINCR(index);
1238 break;
1239
1240 /* Local timers */
1241 case L0_TCON: case L1_TCON:
1242 lt_i = GET_L_TIMER_IDX(offset);
1243 old_val = s->l_timer[lt_i].reg.tcon;
1244
1245 s->l_timer[lt_i].reg.wstat |= L_WSTAT_TCON_WRITE;
1246 s->l_timer[lt_i].reg.tcon = value;
1247
1248 /* Stop local CNT */
1249 if ((value & L_TCON_TICK_START) <
1250 (old_val & L_TCON_TICK_START)) {
1251 DPRINTF("local timer[%d] stop cnt\n", lt_i);
1252 exynos4210_ltick_cnt_stop(&s->l_timer[lt_i].tick_timer);
1253 }
1254
1255 /* Stop local INT */
1256 if ((value & L_TCON_INT_START) <
1257 (old_val & L_TCON_INT_START)) {
1258 DPRINTF("local timer[%d] stop int\n", lt_i);
1259 exynos4210_ltick_int_stop(&s->l_timer[lt_i].tick_timer);
1260 }
1261
1262 /* Start local CNT */
1263 if ((value & L_TCON_TICK_START) >
1264 (old_val & L_TCON_TICK_START)) {
1265 DPRINTF("local timer[%d] start cnt\n", lt_i);
1266 exynos4210_ltick_cnt_start(&s->l_timer[lt_i].tick_timer);
1267 }
1268
1269 /* Start local INT */
1270 if ((value & L_TCON_INT_START) >
1271 (old_val & L_TCON_INT_START)) {
1272 DPRINTF("local timer[%d] start int\n", lt_i);
1273 exynos4210_ltick_int_start(&s->l_timer[lt_i].tick_timer);
1274 }
1275
1276 /* Start or Stop local FRC if TCON changed */
1277 if ((value & L_TCON_FRC_START) >
1278 (s->l_timer[lt_i].reg.tcon & L_TCON_FRC_START)) {
1279 DPRINTF("local timer[%d] start frc\n", lt_i);
1280 exynos4210_lfrc_start(&s->l_timer[lt_i]);
1281 }
1282 if ((value & L_TCON_FRC_START) <
1283 (s->l_timer[lt_i].reg.tcon & L_TCON_FRC_START)) {
1284 DPRINTF("local timer[%d] stop frc\n", lt_i);
1285 exynos4210_lfrc_stop(&s->l_timer[lt_i]);
1286 }
1287 break;
1288
1289 case L0_TCNTB: case L1_TCNTB:
1290
1291 lt_i = GET_L_TIMER_IDX(offset);
1292 index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
1293
1294 /*
1295 * TCNTB is updated to internal register only after CNT expired.
1296 * Due to this we should reload timer to nearest moment when CNT is
1297 * expired and then in event handler update tcntb to new TCNTB value.
1298 */
1299 exynos4210_ltick_set_cntb(&s->l_timer[lt_i].tick_timer, value,
1300 s->l_timer[lt_i].tick_timer.icntb);
1301
1302 s->l_timer[lt_i].reg.wstat |= L_WSTAT_TCNTB_WRITE;
1303 s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB] = value;
1304
1305 #ifdef DEBUG_MCT
1306 if (tcntb_min[lt_i] > value) {
1307 tcntb_min[lt_i] = value;
1308 }
1309 if (tcntb_max[lt_i] < value) {
1310 tcntb_max[lt_i] = value;
1311 }
1312 DPRINTF("local timer[%d] TCNTB write %llx; max=%x, min=%x\n",
1313 lt_i, value, tcntb_max[lt_i], tcntb_min[lt_i]);
1314 #endif
1315 break;
1316
1317 case L0_ICNTB: case L1_ICNTB:
1318
1319 lt_i = GET_L_TIMER_IDX(offset);
1320 index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
1321
1322 s->l_timer[lt_i].reg.wstat |= L_WSTAT_ICNTB_WRITE;
1323 s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] = value &
1324 ~L_ICNTB_MANUAL_UPDATE;
1325
1326 /*
1327 * We need to avoid too small values for TCNTB*ICNTB. If not, IRQ event
1328 * could raise too fast disallowing QEMU to execute target code.
1329 */
1330 if (s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] *
1331 s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB] < MCT_LT_CNT_LOW_LIMIT) {
1332 if (!s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB]) {
1333 s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] =
1334 MCT_LT_CNT_LOW_LIMIT;
1335 } else {
1336 s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB] =
1337 MCT_LT_CNT_LOW_LIMIT /
1338 s->l_timer[lt_i].reg.cnt[L_REG_CNT_TCNTB];
1339 }
1340 }
1341
1342 if (value & L_ICNTB_MANUAL_UPDATE) {
1343 exynos4210_ltick_set_cntb(&s->l_timer[lt_i].tick_timer,
1344 s->l_timer[lt_i].tick_timer.tcntb,
1345 s->l_timer[lt_i].reg.cnt[L_REG_CNT_ICNTB]);
1346 }
1347
1348 #ifdef DEBUG_MCT
1349 if (icntb_min[lt_i] > value) {
1350 icntb_min[lt_i] = value;
1351 }
1352 if (icntb_max[lt_i] < value) {
1353 icntb_max[lt_i] = value;
1354 }
1355 DPRINTF("local timer[%d] ICNTB write %llx; max=%x, min=%x\n\n",
1356 lt_i, value, icntb_max[lt_i], icntb_min[lt_i]);
1357 #endif
1358 break;
1359
1360 case L0_FRCNTB: case L1_FRCNTB:
1361
1362 lt_i = GET_L_TIMER_IDX(offset);
1363 index = GET_L_TIMER_CNT_REG_IDX(offset, lt_i);
1364
1365 DPRINTF("local timer[%d] FRCNTB write %llx\n", lt_i, value);
1366
1367 s->l_timer[lt_i].reg.wstat |= L_WSTAT_FRCCNTB_WRITE;
1368 s->l_timer[lt_i].reg.cnt[L_REG_CNT_FRCCNTB] = value;
1369
1370 break;
1371
1372 case L0_TCNTO: case L1_TCNTO:
1373 case L0_ICNTO: case L1_ICNTO:
1374 case L0_FRCNTO: case L1_FRCNTO:
1375 fprintf(stderr, "\n[exynos4210.mct: write to RO register "
1376 TARGET_FMT_plx "]\n\n", offset);
1377 break;
1378
1379 case L0_INT_CSTAT: case L1_INT_CSTAT:
1380 lt_i = GET_L_TIMER_IDX(offset);
1381
1382 DPRINTF("local timer[%d] CSTAT write %llx\n", lt_i, value);
1383
1384 s->l_timer[lt_i].reg.int_cstat &= ~value;
1385 if (!s->l_timer[lt_i].reg.int_cstat) {
1386 qemu_irq_lower(s->l_timer[lt_i].irq);
1387 }
1388 break;
1389
1390 case L0_INT_ENB: case L1_INT_ENB:
1391 lt_i = GET_L_TIMER_IDX(offset);
1392 old_val = s->l_timer[lt_i].reg.int_enb;
1393
1394 /* Raise Local timer IRQ if cstat is pending */
1395 if ((value & L_INT_INTENB_ICNTEIE) > (old_val & L_INT_INTENB_ICNTEIE)) {
1396 if (s->l_timer[lt_i].reg.int_cstat & L_INT_CSTAT_INTCNT) {
1397 qemu_irq_raise(s->l_timer[lt_i].irq);
1398 }
1399 }
1400
1401 s->l_timer[lt_i].reg.int_enb = value;
1402
1403 break;
1404
1405 case L0_WSTAT: case L1_WSTAT:
1406 lt_i = GET_L_TIMER_IDX(offset);
1407
1408 s->l_timer[lt_i].reg.wstat &= ~value;
1409 break;
1410
1411 default:
1412 hw_error("exynos4210.mct: bad write offset "
1413 TARGET_FMT_plx "\n", offset);
1414 break;
1415 }
1416 }
1417
1418 static const MemoryRegionOps exynos4210_mct_ops = {
1419 .read = exynos4210_mct_read,
1420 .write = exynos4210_mct_write,
1421 .endianness = DEVICE_NATIVE_ENDIAN,
1422 };
1423
1424 /* MCT init */
1425 static void exynos4210_mct_init(Object *obj)
1426 {
1427 int i;
1428 Exynos4210MCTState *s = EXYNOS4210_MCT(obj);
1429 SysBusDevice *dev = SYS_BUS_DEVICE(obj);
1430 QEMUBH *bh[2];
1431
1432 /* Global timer */
1433 bh[0] = qemu_bh_new(exynos4210_gfrc_event, s);
1434 s->g_timer.ptimer_frc = ptimer_init(bh[0]);
1435 memset(&s->g_timer.reg, 0, sizeof(struct gregs));
1436
1437 /* Local timers */
1438 for (i = 0; i < 2; i++) {
1439 bh[0] = qemu_bh_new(exynos4210_ltick_event, &s->l_timer[i]);
1440 bh[1] = qemu_bh_new(exynos4210_lfrc_event, &s->l_timer[i]);
1441 s->l_timer[i].tick_timer.ptimer_tick = ptimer_init(bh[0]);
1442 s->l_timer[i].ptimer_frc = ptimer_init(bh[1]);
1443 s->l_timer[i].id = i;
1444 }
1445
1446 /* IRQs */
1447 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
1448 sysbus_init_irq(dev, &s->g_timer.irq[i]);
1449 }
1450 for (i = 0; i < 2; i++) {
1451 sysbus_init_irq(dev, &s->l_timer[i].irq);
1452 }
1453
1454 memory_region_init_io(&s->iomem, obj, &exynos4210_mct_ops, s,
1455 "exynos4210-mct", MCT_SFR_SIZE);
1456 sysbus_init_mmio(dev, &s->iomem);
1457 }
1458
1459 static void exynos4210_mct_class_init(ObjectClass *klass, void *data)
1460 {
1461 DeviceClass *dc = DEVICE_CLASS(klass);
1462
1463 dc->reset = exynos4210_mct_reset;
1464 dc->vmsd = &vmstate_exynos4210_mct_state;
1465 }
1466
1467 static const TypeInfo exynos4210_mct_info = {
1468 .name = TYPE_EXYNOS4210_MCT,
1469 .parent = TYPE_SYS_BUS_DEVICE,
1470 .instance_size = sizeof(Exynos4210MCTState),
1471 .instance_init = exynos4210_mct_init,
1472 .class_init = exynos4210_mct_class_init,
1473 };
1474
1475 static void exynos4210_mct_register_types(void)
1476 {
1477 type_register_static(&exynos4210_mct_info);
1478 }
1479
1480 type_init(exynos4210_mct_register_types)
QEmu