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target-arm/neon_helper: Remove obsolete FIXME comment
[qemu/pbrook.git] / hw / exynos4210_mct.c
blob6f94ce230c218300e27db4264569b049a2fb2556
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 "sysbus.h"
56 #include "qemu-timer.h"
57 #include "qemu-common.h"
58 #include "ptimer.h"
59
60 #include "exynos4210.h"
61
62 //#define DEBUG_MCT
63
64 #ifdef DEBUG_MCT
65 #define DPRINTF(fmt, ...) \
66 do { fprintf(stdout, "MCT: [%24s:%5d] " fmt, __func__, __LINE__, \
67 ## __VA_ARGS__); } while (0)
68 #else
69 #define DPRINTF(fmt, ...) do {} while (0)
70 #endif
71
72 #define MCT_CFG 0x000
73 #define G_CNT_L 0x100
74 #define G_CNT_U 0x104
75 #define G_CNT_WSTAT 0x110
76 #define G_COMP0_L 0x200
77 #define G_COMP0_U 0x204
78 #define G_COMP0_ADD_INCR 0x208
79 #define G_COMP1_L 0x210
80 #define G_COMP1_U 0x214
81 #define G_COMP1_ADD_INCR 0x218
82 #define G_COMP2_L 0x220
83 #define G_COMP2_U 0x224
84 #define G_COMP2_ADD_INCR 0x228
85 #define G_COMP3_L 0x230
86 #define G_COMP3_U 0x234
87 #define G_COMP3_ADD_INCR 0x238
88 #define G_TCON 0x240
89 #define G_INT_CSTAT 0x244
90 #define G_INT_ENB 0x248
91 #define G_WSTAT 0x24C
92 #define L0_TCNTB 0x300
93 #define L0_TCNTO 0x304
94 #define L0_ICNTB 0x308
95 #define L0_ICNTO 0x30C
96 #define L0_FRCNTB 0x310
97 #define L0_FRCNTO 0x314
98 #define L0_TCON 0x320
99 #define L0_INT_CSTAT 0x330
100 #define L0_INT_ENB 0x334
101 #define L0_WSTAT 0x340
102 #define L1_TCNTB 0x400
103 #define L1_TCNTO 0x404
104 #define L1_ICNTB 0x408
105 #define L1_ICNTO 0x40C
106 #define L1_FRCNTB 0x410
107 #define L1_FRCNTO 0x414
108 #define L1_TCON 0x420
109 #define L1_INT_CSTAT 0x430
110 #define L1_INT_ENB 0x434
111 #define L1_WSTAT 0x440
112
113 #define MCT_CFG_GET_PRESCALER(x) ((x) & 0xFF)
114 #define MCT_CFG_GET_DIVIDER(x) (1 << ((x) >> 8 & 7))
115
116 #define GET_G_COMP_IDX(offset) (((offset) - G_COMP0_L) / 0x10)
117 #define GET_G_COMP_ADD_INCR_IDX(offset) (((offset) - G_COMP0_ADD_INCR) / 0x10)
118
119 #define G_COMP_L(x) (G_COMP0_L + (x) * 0x10)
120 #define G_COMP_U(x) (G_COMP0_U + (x) * 0x10)
121
122 #define G_COMP_ADD_INCR(x) (G_COMP0_ADD_INCR + (x) * 0x10)
123
124 /* MCT bits */
125 #define G_TCON_COMP_ENABLE(x) (1 << 2 * (x))
126 #define G_TCON_AUTO_ICREMENT(x) (1 << (2 * (x) + 1))
127 #define G_TCON_TIMER_ENABLE (1 << 8)
128
129 #define G_INT_ENABLE(x) (1 << (x))
130 #define G_INT_CSTAT_COMP(x) (1 << (x))
131
132 #define G_CNT_WSTAT_L 1
133 #define G_CNT_WSTAT_U 2
134
135 #define G_WSTAT_COMP_L(x) (1 << 4 * (x))
136 #define G_WSTAT_COMP_U(x) (1 << ((4 * (x)) + 1))
137 #define G_WSTAT_COMP_ADDINCR(x) (1 << ((4 * (x)) + 2))
138 #define G_WSTAT_TCON_WRITE (1 << 16)
139
140 #define GET_L_TIMER_IDX(offset) ((((offset) & 0xF00) - L0_TCNTB) / 0x100)
141 #define GET_L_TIMER_CNT_REG_IDX(offset, lt_i) \
142 (((offset) - (L0_TCNTB + 0x100 * (lt_i))) >> 2)
143
144 #define L_ICNTB_MANUAL_UPDATE (1 << 31)
145
146 #define L_TCON_TICK_START (1)
147 #define L_TCON_INT_START (1 << 1)
148 #define L_TCON_INTERVAL_MODE (1 << 2)
149 #define L_TCON_FRC_START (1 << 3)
150
151 #define L_INT_CSTAT_INTCNT (1 << 0)
152 #define L_INT_CSTAT_FRCCNT (1 << 1)
153
154 #define L_INT_INTENB_ICNTEIE (1 << 0)
155 #define L_INT_INTENB_FRCEIE (1 << 1)
156
157 #define L_WSTAT_TCNTB_WRITE (1 << 0)
158 #define L_WSTAT_ICNTB_WRITE (1 << 1)
159 #define L_WSTAT_FRCCNTB_WRITE (1 << 2)
160 #define L_WSTAT_TCON_WRITE (1 << 3)
161
162 enum LocalTimerRegCntIndexes {
163 L_REG_CNT_TCNTB,
164 L_REG_CNT_TCNTO,
165 L_REG_CNT_ICNTB,
166 L_REG_CNT_ICNTO,
167 L_REG_CNT_FRCCNTB,
168 L_REG_CNT_FRCCNTO,
169
170 L_REG_CNT_AMOUNT
171 };
172
173 #define MCT_NIRQ 6
174 #define MCT_SFR_SIZE 0x444
175
176 #define MCT_GT_CMP_NUM 4
177
178 #define MCT_GT_MAX_VAL UINT64_MAX
179
180 #define MCT_GT_COUNTER_STEP 0x100000000ULL
181 #define MCT_LT_COUNTER_STEP 0x100000000ULL
182 #define MCT_LT_CNT_LOW_LIMIT 0x100
183
184 /* global timer */
185 typedef struct {
186 qemu_irq irq[MCT_GT_CMP_NUM];
187
188 struct gregs {
189 uint64_t cnt;
190 uint32_t cnt_wstat;
191 uint32_t tcon;
192 uint32_t int_cstat;
193 uint32_t int_enb;
194 uint32_t wstat;
195 uint64_t comp[MCT_GT_CMP_NUM];
196 uint32_t comp_add_incr[MCT_GT_CMP_NUM];
197 } reg;
198
199 uint64_t count; /* Value FRC was armed with */
200 int32_t curr_comp; /* Current comparator FRC is running to */
201
202 ptimer_state *ptimer_frc; /* FRC timer */
203
204 } Exynos4210MCTGT;
205
206 /* local timer */
207 typedef struct {
208 int id; /* timer id */
209 qemu_irq irq; /* local timer irq */
210
211 struct tick_timer {
212 uint32_t cnt_run; /* cnt timer is running */
213 uint32_t int_run; /* int timer is running */
214
215 uint32_t last_icnto;
216 uint32_t last_tcnto;
217 uint32_t tcntb; /* initial value for TCNTB */
218 uint32_t icntb; /* initial value for ICNTB */
219
220 /* for step mode */
221 uint64_t distance; /* distance to count to the next event */
222 uint64_t progress; /* progress when counting by steps */
223 uint64_t count; /* count to arm timer with */
224
225 ptimer_state *ptimer_tick; /* timer for tick counter */
226 } tick_timer;
227
228 /* use ptimer.c to represent count down timer */
229
230 ptimer_state *ptimer_frc; /* timer for free running counter */
231
232 /* registers */
233 struct lregs {
234 uint32_t cnt[L_REG_CNT_AMOUNT];
235 uint32_t tcon;
236 uint32_t int_cstat;
237 uint32_t int_enb;
238 uint32_t wstat;
239 } reg;
240
241 } Exynos4210MCTLT;
242
243 typedef struct Exynos4210MCTState {
244 SysBusDevice busdev;
245 MemoryRegion iomem;
246
247 /* Registers */
248 uint32_t reg_mct_cfg;
249
250 Exynos4210MCTLT l_timer[2];
251 Exynos4210MCTGT g_timer;
252
253 uint32_t freq; /* all timers tick frequency, TCLK */
254 } Exynos4210MCTState;
255
256 /*** VMState ***/
257 static const VMStateDescription vmstate_tick_timer = {
258 .name = "exynos4210.mct.tick_timer",
259 .version_id = 1,
260 .minimum_version_id = 1,
261 .minimum_version_id_old = 1,
262 .fields = (VMStateField[]) {
263 VMSTATE_UINT32(cnt_run, struct tick_timer),
264 VMSTATE_UINT32(int_run, struct tick_timer),
265 VMSTATE_UINT32(last_icnto, struct tick_timer),
266 VMSTATE_UINT32(last_tcnto, struct tick_timer),
267 VMSTATE_UINT32(tcntb, struct tick_timer),
268 VMSTATE_UINT32(icntb, struct tick_timer),
269 VMSTATE_UINT64(distance, struct tick_timer),
270 VMSTATE_UINT64(progress, struct tick_timer),
271 VMSTATE_UINT64(count, struct tick_timer),
272 VMSTATE_PTIMER(ptimer_tick, struct tick_timer),
273 VMSTATE_END_OF_LIST()
274 }
275 };
276
277 static const VMStateDescription vmstate_lregs = {
278 .name = "exynos4210.mct.lregs",
279 .version_id = 1,
280 .minimum_version_id = 1,
281 .minimum_version_id_old = 1,
282 .fields = (VMStateField[]) {
283 VMSTATE_UINT32_ARRAY(cnt, struct lregs, L_REG_CNT_AMOUNT),
284 VMSTATE_UINT32(tcon, struct lregs),
285 VMSTATE_UINT32(int_cstat, struct lregs),
286 VMSTATE_UINT32(int_enb, struct lregs),
287 VMSTATE_UINT32(wstat, struct lregs),
288 VMSTATE_END_OF_LIST()
289 }
290 };
291
292 static const VMStateDescription vmstate_exynos4210_mct_lt = {
293 .name = "exynos4210.mct.lt",
294 .version_id = 1,
295 .minimum_version_id = 1,
296 .minimum_version_id_old = 1,
297 .fields = (VMStateField[]) {
298 VMSTATE_INT32(id, Exynos4210MCTLT),
299 VMSTATE_STRUCT(tick_timer, Exynos4210MCTLT, 0,
300 vmstate_tick_timer,
301 struct tick_timer),
302 VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTLT),
303 VMSTATE_STRUCT(reg, Exynos4210MCTLT, 0,
304 vmstate_lregs,
305 struct lregs),
306 VMSTATE_END_OF_LIST()
307 }
308 };
309
310 static const VMStateDescription vmstate_gregs = {
311 .name = "exynos4210.mct.lregs",
312 .version_id = 1,
313 .minimum_version_id = 1,
314 .minimum_version_id_old = 1,
315 .fields = (VMStateField[]) {
316 VMSTATE_UINT64(cnt, struct gregs),
317 VMSTATE_UINT32(cnt_wstat, struct gregs),
318 VMSTATE_UINT32(tcon, struct gregs),
319 VMSTATE_UINT32(int_cstat, struct gregs),
320 VMSTATE_UINT32(int_enb, struct gregs),
321 VMSTATE_UINT32(wstat, struct gregs),
322 VMSTATE_UINT64_ARRAY(comp, struct gregs, MCT_GT_CMP_NUM),
323 VMSTATE_UINT32_ARRAY(comp_add_incr, struct gregs,
324 MCT_GT_CMP_NUM),
325 VMSTATE_END_OF_LIST()
326 }
327 };
328
329 static const VMStateDescription vmstate_exynos4210_mct_gt = {
330 .name = "exynos4210.mct.lt",
331 .version_id = 1,
332 .minimum_version_id = 1,
333 .minimum_version_id_old = 1,
334 .fields = (VMStateField[]) {
335 VMSTATE_STRUCT(reg, Exynos4210MCTGT, 0, vmstate_gregs,
336 struct gregs),
337 VMSTATE_UINT64(count, Exynos4210MCTGT),
338 VMSTATE_INT32(curr_comp, Exynos4210MCTGT),
339 VMSTATE_PTIMER(ptimer_frc, Exynos4210MCTGT),
340 VMSTATE_END_OF_LIST()
341 }
342 };
343
344 static const VMStateDescription vmstate_exynos4210_mct_state = {
345 .name = "exynos4210.mct",
346 .version_id = 1,
347 .minimum_version_id = 1,
348 .minimum_version_id_old = 1,
349 .fields = (VMStateField[]) {
350 VMSTATE_UINT32(reg_mct_cfg, Exynos4210MCTState),
351 VMSTATE_STRUCT_ARRAY(l_timer, Exynos4210MCTState, 2, 0,
352 vmstate_exynos4210_mct_lt, Exynos4210MCTLT),
353 VMSTATE_STRUCT(g_timer, Exynos4210MCTState, 0,
354 vmstate_exynos4210_mct_gt, Exynos4210MCTGT),
355 VMSTATE_UINT32(freq, Exynos4210MCTState),
356 VMSTATE_END_OF_LIST()
357 }
358 };
359
360 static void exynos4210_mct_update_freq(Exynos4210MCTState *s);
361
362 /*
363 * Set counter of FRC global timer.
364 */
365 static void exynos4210_gfrc_set_count(Exynos4210MCTGT *s, uint64_t count)
366 {
367 s->count = count;
368 DPRINTF("global timer frc set count 0x%llx\n", count);
369 ptimer_set_count(s->ptimer_frc, count);
370 }
371
372 /*
373 * Get counter of FRC global timer.
374 */
375 static uint64_t exynos4210_gfrc_get_count(Exynos4210MCTGT *s)
376 {
377 uint64_t count = 0;
378 count = ptimer_get_count(s->ptimer_frc);
379 count = s->count - count;
380 return s->reg.cnt + count;
381 }
382
383 /*
384 * Stop global FRC timer
385 */
386 static void exynos4210_gfrc_stop(Exynos4210MCTGT *s)
387 {
388 DPRINTF("global timer frc stop\n");
389
390 ptimer_stop(s->ptimer_frc);
391 }
392
393 /*
394 * Start global FRC timer
395 */
396 static void exynos4210_gfrc_start(Exynos4210MCTGT *s)
397 {
398 DPRINTF("global timer frc start\n");
399
400 ptimer_run(s->ptimer_frc, 1);
401 }
402
403 /*
404 * Find next nearest Comparator. If current Comparator value equals to other
405 * Comparator value, skip them both
406 */
407 static int32_t exynos4210_gcomp_find(Exynos4210MCTState *s)
408 {
409 int res;
410 int i;
411 int enabled;
412 uint64_t min;
413 int min_comp_i;
414 uint64_t gfrc;
415 uint64_t distance;
416 uint64_t distance_min;
417 int comp_i;
418
419 /* get gfrc count */
420 gfrc = exynos4210_gfrc_get_count(&s->g_timer);
421
422 min = UINT64_MAX;
423 distance_min = UINT64_MAX;
424 comp_i = MCT_GT_CMP_NUM;
425 min_comp_i = MCT_GT_CMP_NUM;
426 enabled = 0;
427
428 /* lookup for nearest comparator */
429 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
430
431 if (s->g_timer.reg.tcon & G_TCON_COMP_ENABLE(i)) {
432
433 enabled = 1;
434
435 if (s->g_timer.reg.comp[i] > gfrc) {
436 /* Comparator is upper then FRC */
437 distance = s->g_timer.reg.comp[i] - gfrc;
438
439 if (distance <= distance_min) {
440 distance_min = distance;
441 comp_i = i;
442 }
443 } else {
444 /* Comparator is below FRC, find the smallest */
445
446 if (s->g_timer.reg.comp[i] <= min) {
447 min = s->g_timer.reg.comp[i];
448 min_comp_i = i;
449 }
450 }
451 }
452 }
453
454 if (!enabled) {
455 /* All Comparators disabled */
456 res = -1;
457 } else if (comp_i < MCT_GT_CMP_NUM) {
458 /* Found upper Comparator */
459 res = comp_i;
460 } else {
461 /* All Comparators are below or equal to FRC */
462 res = min_comp_i;
463 }
464
465 DPRINTF("found comparator %d: comp 0x%llx distance 0x%llx, gfrc 0x%llx\n",
466 res,
467 s->g_timer.reg.comp[res],
468 distance_min,
469 gfrc);
470
471 return res;
472 }
473
474 /*
475 * Get distance to nearest Comparator
476 */
477 static uint64_t exynos4210_gcomp_get_distance(Exynos4210MCTState *s, int32_t id)
478 {
479 if (id == -1) {
480 /* no enabled Comparators, choose max distance */
481 return MCT_GT_COUNTER_STEP;
482 }
483 if (s->g_timer.reg.comp[id] - s->g_timer.reg.cnt < MCT_GT_COUNTER_STEP) {
484 return s->g_timer.reg.comp[id] - s->g_timer.reg.cnt;
485 } else {
486 return MCT_GT_COUNTER_STEP;
487 }
488 }
489
490 /*
491 * Restart global FRC timer
492 */
493 static void exynos4210_gfrc_restart(Exynos4210MCTState *s)
494 {
495 uint64_t distance;
496
497 exynos4210_gfrc_stop(&s->g_timer);
498
499 s->g_timer.curr_comp = exynos4210_gcomp_find(s);
500
501 distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);
502
503 if (distance > MCT_GT_COUNTER_STEP || !distance) {
504 distance = MCT_GT_COUNTER_STEP;
505 }
506
507 exynos4210_gfrc_set_count(&s->g_timer, distance);
508 exynos4210_gfrc_start(&s->g_timer);
509 }
510
511 /*
512 * Raise global timer CMP IRQ
513 */
514 static void exynos4210_gcomp_raise_irq(void *opaque, uint32_t id)
515 {
516 Exynos4210MCTGT *s = opaque;
517
518 /* If CSTAT is pending and IRQ is enabled */
519 if ((s->reg.int_cstat & G_INT_CSTAT_COMP(id)) &&
520 (s->reg.int_enb & G_INT_ENABLE(id))) {
521 DPRINTF("gcmp timer[%d] IRQ\n", id);
522 qemu_irq_raise(s->irq[id]);
523 }
524 }
525
526 /*
527 * Lower global timer CMP IRQ
528 */
529 static void exynos4210_gcomp_lower_irq(void *opaque, uint32_t id)
530 {
531 Exynos4210MCTGT *s = opaque;
532 qemu_irq_lower(s->irq[id]);
533 }
534
535 /*
536 * Global timer FRC event handler.
537 * Each event occurs when internal counter reaches counter + MCT_GT_COUNTER_STEP
538 * Every time we arm global FRC timer to count for MCT_GT_COUNTER_STEP value
539 */
540 static void exynos4210_gfrc_event(void *opaque)
541 {
542 Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
543 int i;
544 uint64_t distance;
545
546 DPRINTF("\n");
547
548 s->g_timer.reg.cnt += s->g_timer.count;
549
550 /* Process all comparators */
551 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
552
553 if (s->g_timer.reg.cnt == s->g_timer.reg.comp[i]) {
554 /* reached nearest comparator */
555
556 s->g_timer.reg.int_cstat |= G_INT_CSTAT_COMP(i);
557
558 /* Auto increment */
559 if (s->g_timer.reg.tcon & G_TCON_AUTO_ICREMENT(i)) {
560 s->g_timer.reg.comp[i] += s->g_timer.reg.comp_add_incr[i];
561 }
562
563 /* IRQ */
564 exynos4210_gcomp_raise_irq(&s->g_timer, i);
565 }
566 }
567
568 /* Reload FRC to reach nearest comparator */
569 s->g_timer.curr_comp = exynos4210_gcomp_find(s);
570 distance = exynos4210_gcomp_get_distance(s, s->g_timer.curr_comp);
571 if (distance > MCT_GT_COUNTER_STEP) {
572 distance = MCT_GT_COUNTER_STEP;
573 }
574 exynos4210_gfrc_set_count(&s->g_timer, distance);
575
576 exynos4210_gfrc_start(&s->g_timer);
577 }
578
579 /*
580 * Get counter of FRC local timer.
581 */
582 static uint64_t exynos4210_lfrc_get_count(Exynos4210MCTLT *s)
583 {
584 return ptimer_get_count(s->ptimer_frc);
585 }
586
587 /*
588 * Set counter of FRC local timer.
589 */
590 static void exynos4210_lfrc_update_count(Exynos4210MCTLT *s)
591 {
592 if (!s->reg.cnt[L_REG_CNT_FRCCNTB]) {
593 ptimer_set_count(s->ptimer_frc, MCT_LT_COUNTER_STEP);
594 } else {
595 ptimer_set_count(s->ptimer_frc, s->reg.cnt[L_REG_CNT_FRCCNTB]);
596 }
597 }
598
599 /*
600 * Start local FRC timer
601 */
602 static void exynos4210_lfrc_start(Exynos4210MCTLT *s)
603 {
604 ptimer_run(s->ptimer_frc, 1);
605 }
606
607 /*
608 * Stop local FRC timer
609 */
610 static void exynos4210_lfrc_stop(Exynos4210MCTLT *s)
611 {
612 ptimer_stop(s->ptimer_frc);
613 }
614
615 /*
616 * Local timer free running counter tick handler
617 */
618 static void exynos4210_lfrc_event(void *opaque)
619 {
620 Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;
621
622 /* local frc expired */
623
624 DPRINTF("\n");
625
626 s->reg.int_cstat |= L_INT_CSTAT_FRCCNT;
627
628 /* update frc counter */
629 exynos4210_lfrc_update_count(s);
630
631 /* raise irq */
632 if (s->reg.int_enb & L_INT_INTENB_FRCEIE) {
633 qemu_irq_raise(s->irq);
634 }
635
636 /* we reached here, this means that timer is enabled */
637 exynos4210_lfrc_start(s);
638 }
639
640 static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s);
641 static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s);
642 static void exynos4210_ltick_recalc_count(struct tick_timer *s);
643
644 /*
645 * Action on enabling local tick int timer
646 */
647 static void exynos4210_ltick_int_start(struct tick_timer *s)
648 {
649 if (!s->int_run) {
650 s->int_run = 1;
651 }
652 }
653
654 /*
655 * Action on disabling local tick int timer
656 */
657 static void exynos4210_ltick_int_stop(struct tick_timer *s)
658 {
659 if (s->int_run) {
660 s->last_icnto = exynos4210_ltick_int_get_cnto(s);
661 s->int_run = 0;
662 }
663 }
664
665 /*
666 * Get count for INT timer
667 */
668 static uint32_t exynos4210_ltick_int_get_cnto(struct tick_timer *s)
669 {
670 uint32_t icnto;
671 uint64_t remain;
672 uint64_t count;
673 uint64_t counted;
674 uint64_t cur_progress;
675
676 count = ptimer_get_count(s->ptimer_tick);
677 if (count) {
678 /* timer is still counting, called not from event */
679 counted = s->count - ptimer_get_count(s->ptimer_tick);
680 cur_progress = s->progress + counted;
681 } else {
682 /* timer expired earlier */
683 cur_progress = s->progress;
684 }
685
686 remain = s->distance - cur_progress;
687
688 if (!s->int_run) {
689 /* INT is stopped. */
690 icnto = s->last_icnto;
691 } else {
692 /* Both are counting */
693 icnto = remain / s->tcntb;
694 }
695
696 return icnto;
697 }
698
699 /*
700 * Start local tick cnt timer.
701 */
702 static void exynos4210_ltick_cnt_start(struct tick_timer *s)
703 {
704 if (!s->cnt_run) {
705
706 exynos4210_ltick_recalc_count(s);
707 ptimer_set_count(s->ptimer_tick, s->count);
708 ptimer_run(s->ptimer_tick, 1);
709
710 s->cnt_run = 1;
711 }
712 }
713
714 /*
715 * Stop local tick cnt timer.
716 */
717 static void exynos4210_ltick_cnt_stop(struct tick_timer *s)
718 {
719 if (s->cnt_run) {
720
721 s->last_tcnto = exynos4210_ltick_cnt_get_cnto(s);
722
723 if (s->int_run) {
724 exynos4210_ltick_int_stop(s);
725 }
726
727 ptimer_stop(s->ptimer_tick);
728
729 s->cnt_run = 0;
730 }
731 }
732
733 /*
734 * Get counter for CNT timer
735 */
736 static uint32_t exynos4210_ltick_cnt_get_cnto(struct tick_timer *s)
737 {
738 uint32_t tcnto;
739 uint32_t icnto;
740 uint64_t remain;
741 uint64_t counted;
742 uint64_t count;
743 uint64_t cur_progress;
744
745 count = ptimer_get_count(s->ptimer_tick);
746 if (count) {
747 /* timer is still counting, called not from event */
748 counted = s->count - ptimer_get_count(s->ptimer_tick);
749 cur_progress = s->progress + counted;
750 } else {
751 /* timer expired earlier */
752 cur_progress = s->progress;
753 }
754
755 remain = s->distance - cur_progress;
756
757 if (!s->cnt_run) {
758 /* Both are stopped. */
759 tcnto = s->last_tcnto;
760 } else if (!s->int_run) {
761 /* INT counter is stopped, progress is by CNT timer */
762 tcnto = remain % s->tcntb;
763 } else {
764 /* Both are counting */
765 icnto = remain / s->tcntb;
766 if (icnto) {
767 tcnto = remain % (icnto * s->tcntb);
768 } else {
769 tcnto = remain % s->tcntb;
770 }
771 }
772
773 return tcnto;
774 }
775
776 /*
777 * Set new values of counters for CNT and INT timers
778 */
779 static void exynos4210_ltick_set_cntb(struct tick_timer *s, uint32_t new_cnt,
780 uint32_t new_int)
781 {
782 uint32_t cnt_stopped = 0;
783 uint32_t int_stopped = 0;
784
785 if (s->cnt_run) {
786 exynos4210_ltick_cnt_stop(s);
787 cnt_stopped = 1;
788 }
789
790 if (s->int_run) {
791 exynos4210_ltick_int_stop(s);
792 int_stopped = 1;
793 }
794
795 s->tcntb = new_cnt + 1;
796 s->icntb = new_int + 1;
797
798 if (cnt_stopped) {
799 exynos4210_ltick_cnt_start(s);
800 }
801 if (int_stopped) {
802 exynos4210_ltick_int_start(s);
803 }
804
805 }
806
807 /*
808 * Calculate new counter value for tick timer
809 */
810 static void exynos4210_ltick_recalc_count(struct tick_timer *s)
811 {
812 uint64_t to_count;
813
814 if ((s->cnt_run && s->last_tcnto) || (s->int_run && s->last_icnto)) {
815 /*
816 * one or both timers run and not counted to the end;
817 * distance is not passed, recalculate with last_tcnto * last_icnto
818 */
819
820 if (s->last_tcnto) {
821 to_count = s->last_tcnto * s->last_icnto;
822 } else {
823 to_count = s->last_icnto;
824 }
825 } else {
826 /* distance is passed, recalculate with tcnto * icnto */
827 if (s->icntb) {
828 s->distance = s->tcntb * s->icntb;
829 } else {
830 s->distance = s->tcntb;
831 }
832
833 to_count = s->distance;
834 s->progress = 0;
835 }
836
837 if (to_count > MCT_LT_COUNTER_STEP) {
838 /* count by step */
839 s->count = MCT_LT_COUNTER_STEP;
840 } else {
841 s->count = to_count;
842 }
843 }
844
845 /*
846 * Initialize tick_timer
847 */
848 static void exynos4210_ltick_timer_init(struct tick_timer *s)
849 {
850 exynos4210_ltick_int_stop(s);
851 exynos4210_ltick_cnt_stop(s);
852
853 s->count = 0;
854 s->distance = 0;
855 s->progress = 0;
856 s->icntb = 0;
857 s->tcntb = 0;
858 }
859
860 /*
861 * tick_timer event.
862 * Raises when abstract tick_timer expires.
863 */
864 static void exynos4210_ltick_timer_event(struct tick_timer *s)
865 {
866 s->progress += s->count;
867 }
868
869 /*
870 * Local timer tick counter handler.
871 * Don't use reloaded timers. If timer counter = zero
872 * then handler called but after handler finished no
873 * timer reload occurs.
874 */
875 static void exynos4210_ltick_event(void *opaque)
876 {
877 Exynos4210MCTLT * s = (Exynos4210MCTLT *)opaque;
878 uint32_t tcnto;
879 uint32_t icnto;
880 #ifdef DEBUG_MCT
881 static uint64_t time1[2] = {0};
882 static uint64_t time2[2] = {0};
883 #endif
884
885 /* Call tick_timer event handler, it will update its tcntb and icntb. */
886 exynos4210_ltick_timer_event(&s->tick_timer);
887
888 /* get tick_timer cnt */
889 tcnto = exynos4210_ltick_cnt_get_cnto(&s->tick_timer);
890
891 /* get tick_timer int */
892 icnto = exynos4210_ltick_int_get_cnto(&s->tick_timer);
893
894 /* raise IRQ if needed */
895 if (!icnto && s->reg.tcon & L_TCON_INT_START) {
896 /* INT counter enabled and expired */
897
898 s->reg.int_cstat |= L_INT_CSTAT_INTCNT;
899
900 /* raise interrupt if enabled */
901 if (s->reg.int_enb & L_INT_INTENB_ICNTEIE) {
902 #ifdef DEBUG_MCT
903 time2[s->id] = qemu_get_clock_ns(vm_clock);
904 DPRINTF("local timer[%d] IRQ: %llx\n", s->id,
905 time2[s->id] - time1[s->id]);
906 time1[s->id] = time2[s->id];
907 #endif
908 qemu_irq_raise(s->irq);
909 }
910
911 /* reload ICNTB */
912 if (s->reg.tcon & L_TCON_INTERVAL_MODE) {
913 exynos4210_ltick_set_cntb(&s->tick_timer,
914 s->reg.cnt[L_REG_CNT_TCNTB],
915 s->reg.cnt[L_REG_CNT_ICNTB]);
916 }
917 } else {
918 /* reload TCNTB */
919 if (!tcnto) {
920 exynos4210_ltick_set_cntb(&s->tick_timer,
921 s->reg.cnt[L_REG_CNT_TCNTB],
922 icnto);
923 }
924 }
925
926 /* start tick_timer cnt */
927 exynos4210_ltick_cnt_start(&s->tick_timer);
928
929 /* start tick_timer int */
930 exynos4210_ltick_int_start(&s->tick_timer);
931 }
932
933 /* update timer frequency */
934 static void exynos4210_mct_update_freq(Exynos4210MCTState *s)
935 {
936 uint32_t freq = s->freq;
937 s->freq = 24000000 /
938 ((MCT_CFG_GET_PRESCALER(s->reg_mct_cfg)+1) *
939 MCT_CFG_GET_DIVIDER(s->reg_mct_cfg));
940
941 if (freq != s->freq) {
942 DPRINTF("freq=%dHz\n", s->freq);
943
944 /* global timer */
945 ptimer_set_freq(s->g_timer.ptimer_frc, s->freq);
946
947 /* local timer */
948 ptimer_set_freq(s->l_timer[0].tick_timer.ptimer_tick, s->freq);
949 ptimer_set_freq(s->l_timer[0].ptimer_frc, s->freq);
950 ptimer_set_freq(s->l_timer[1].tick_timer.ptimer_tick, s->freq);
951 ptimer_set_freq(s->l_timer[1].ptimer_frc, s->freq);
952 }
953 }
954
955 /* set defaul_timer values for all fields */
956 static void exynos4210_mct_reset(DeviceState *d)
957 {
958 Exynos4210MCTState *s = (Exynos4210MCTState *)d;
959 uint32_t i;
960
961 s->reg_mct_cfg = 0;
962
963 /* global timer */
964 memset(&s->g_timer.reg, 0, sizeof(s->g_timer.reg));
965 exynos4210_gfrc_stop(&s->g_timer);
966
967 /* local timer */
968 memset(s->l_timer[0].reg.cnt, 0, sizeof(s->l_timer[0].reg.cnt));
969 memset(s->l_timer[1].reg.cnt, 0, sizeof(s->l_timer[1].reg.cnt));
970 for (i = 0; i < 2; i++) {
971 s->l_timer[i].reg.int_cstat = 0;
972 s->l_timer[i].reg.int_enb = 0;
973 s->l_timer[i].reg.tcon = 0;
974 s->l_timer[i].reg.wstat = 0;
975 s->l_timer[i].tick_timer.count = 0;
976 s->l_timer[i].tick_timer.distance = 0;
977 s->l_timer[i].tick_timer.progress = 0;
978 ptimer_stop(s->l_timer[i].ptimer_frc);
979
980 exynos4210_ltick_timer_init(&s->l_timer[i].tick_timer);
981 }
982
983 exynos4210_mct_update_freq(s);
984
985 }
986
987 /* Multi Core Timer read */
988 static uint64_t exynos4210_mct_read(void *opaque, target_phys_addr_t offset,
989 unsigned size)
990 {
991 Exynos4210MCTState *s = (Exynos4210MCTState *)opaque;
992 int index;
993 int shift;
994 uint64_t count;
995 uint32_t value;
996 int lt_i;
997
998 switch (offset) {
999
1000 case MCT_CFG:
1001 value = s->reg_mct_cfg;
1002 break;
1003
1004 case G_CNT_L: case G_CNT_U:
1005 shift = 8 * (offset & 0x4);
1006 count = exynos4210_gfrc_get_count(&s->g_timer);
1007 value = UINT32_MAX & (count >> shift);
1008 DPRINTF("read FRC=0x%llx\n", count);
1009 break;
1010
1011 case G_CNT_WSTAT:
1012 value = s->g_timer.reg.cnt_wstat;
1013 break;
1014
1015 case G_COMP_L(0): case G_COMP_L(1): case G_COMP_L(2): case G_COMP_L(3):
1016 case G_COMP_U(0): case G_COMP_U(1): case G_COMP_U(2): case G_COMP_U(3):
1017 index = GET_G_COMP_IDX(offset);
1018 shift = 8 * (offset & 0x4);
1019 value = UINT32_MAX & (s->g_timer.reg.comp[index] >> shift);
1020 break;
1021
1022 case G_TCON:
1023 value = s->g_timer.reg.tcon;
1024 break;
1025
1026 case G_INT_CSTAT:
1027 value = s->g_timer.reg.int_cstat;
1028 break;
1029
1030 case G_INT_ENB:
1031 value = s->g_timer.reg.int_enb;
1032 break;
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, target_phys_addr_t 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 int exynos4210_mct_init(SysBusDevice *dev)
1426 {
1427 int i;
1428 Exynos4210MCTState *s = FROM_SYSBUS(Exynos4210MCTState, dev);
1429 QEMUBH *bh[2];
1430
1431 /* Global timer */
1432 bh[0] = qemu_bh_new(exynos4210_gfrc_event, s);
1433 s->g_timer.ptimer_frc = ptimer_init(bh[0]);
1434 memset(&s->g_timer.reg, 0, sizeof(struct gregs));
1435
1436 /* Local timers */
1437 for (i = 0; i < 2; i++) {
1438 bh[0] = qemu_bh_new(exynos4210_ltick_event, &s->l_timer[i]);
1439 bh[1] = qemu_bh_new(exynos4210_lfrc_event, &s->l_timer[i]);
1440 s->l_timer[i].tick_timer.ptimer_tick = ptimer_init(bh[0]);
1441 s->l_timer[i].ptimer_frc = ptimer_init(bh[1]);
1442 s->l_timer[i].id = i;
1443 }
1444
1445 /* IRQs */
1446 for (i = 0; i < MCT_GT_CMP_NUM; i++) {
1447 sysbus_init_irq(dev, &s->g_timer.irq[i]);
1448 }
1449 for (i = 0; i < 2; i++) {
1450 sysbus_init_irq(dev, &s->l_timer[i].irq);
1451 }
1452
1453 memory_region_init_io(&s->iomem, &exynos4210_mct_ops, s, "exynos4210-mct",
1454 MCT_SFR_SIZE);
1455 sysbus_init_mmio(dev, &s->iomem);
1456
1457 return 0;
1458 }
1459
1460 static void exynos4210_mct_class_init(ObjectClass *klass, void *data)
1461 {
1462 DeviceClass *dc = DEVICE_CLASS(klass);
1463 SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
1464
1465 k->init = exynos4210_mct_init;
1466 dc->reset = exynos4210_mct_reset;
1467 dc->vmsd = &vmstate_exynos4210_mct_state;
1468 }
1469
1470 static TypeInfo exynos4210_mct_info = {
1471 .name = "exynos4210.mct",
1472 .parent = TYPE_SYS_BUS_DEVICE,
1473 .instance_size = sizeof(Exynos4210MCTState),
1474 .class_init = exynos4210_mct_class_init,
1475 };
1476
1477 static void exynos4210_mct_register_types(void)
1478 {
1479 type_register_static(&exynos4210_mct_info);
1480 }
1481
1482 type_init(exynos4210_mct_register_types)
Various patches