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8#include "qemu/osdep.h"
9#include "hw/sysbus.h"
10#include "hw/irq.h"
11#include "include/hw/register.h"
12#include "qemu/timer.h"
13#include "sysemu/sysemu.h"
14#include "qemu/cutils.h"
15#include "qemu/log.h"
16#include "migration/vmstate.h"
17#include "hw/misc/unimp.h"
18#include "sysemu/rtc.h"
19#include "hw/registerfields.h"
20
21#define SYS_TOYTRIM 0x20
22#define SYS_TOYWRITE0 0x24
23#define SYS_TOYWRITE1 0x28
24#define SYS_TOYREAD0 0x2C
25#define SYS_TOYREAD1 0x30
26#define SYS_TOYMATCH0 0x34
27#define SYS_TOYMATCH1 0x38
28#define SYS_TOYMATCH2 0x3C
29#define SYS_RTCCTRL 0x40
30#define SYS_RTCTRIM 0x60
31#define SYS_RTCWRTIE0 0x64
32#define SYS_RTCREAD0 0x68
33#define SYS_RTCMATCH0 0x6C
34#define SYS_RTCMATCH1 0x70
35#define SYS_RTCMATCH2 0x74
36
37#define LS7A_RTC_FREQ 32768
38#define TIMER_NUMS 3
39
40
41
42
43FIELD(TOY, MON, 26, 6)
44FIELD(TOY, DAY, 21, 5)
45FIELD(TOY, HOUR, 16, 5)
46FIELD(TOY, MIN, 10, 6)
47FIELD(TOY, SEC, 4, 6)
48FIELD(TOY, MSEC, 0, 4)
49
50FIELD(TOY_MATCH, YEAR, 26, 6)
51FIELD(TOY_MATCH, MON, 22, 4)
52FIELD(TOY_MATCH, DAY, 17, 5)
53FIELD(TOY_MATCH, HOUR, 12, 5)
54FIELD(TOY_MATCH, MIN, 6, 6)
55FIELD(TOY_MATCH, SEC, 0, 6)
56
57FIELD(RTC_CTRL, RTCEN, 13, 1)
58FIELD(RTC_CTRL, TOYEN, 11, 1)
59FIELD(RTC_CTRL, EO, 8, 1)
60
61#define TYPE_LS7A_RTC "ls7a_rtc"
62OBJECT_DECLARE_SIMPLE_TYPE(LS7ARtcState, LS7A_RTC)
63
64struct LS7ARtcState {
65 SysBusDevice parent_obj;
66
67 MemoryRegion iomem;
68
69
70
71
72
73 int64_t offset_toy;
74 int64_t offset_rtc;
75 int64_t data;
76 int tidx;
77 uint32_t toymatch[3];
78 uint32_t toytrim;
79 uint32_t cntrctl;
80 uint32_t rtctrim;
81 uint32_t rtccount;
82 uint32_t rtcmatch[3];
83 QEMUTimer *toy_timer[TIMER_NUMS];
84 QEMUTimer *rtc_timer[TIMER_NUMS];
85 qemu_irq irq;
86};
87
88
89static uint64_t ls7a_rtc_ticks(void)
90{
91 return qemu_clock_get_ns(rtc_clock) * LS7A_RTC_FREQ / NANOSECONDS_PER_SECOND;
92}
93
94
95static uint64_t ticks_to_ns(uint64_t ticks)
96{
97 return ticks * NANOSECONDS_PER_SECOND / LS7A_RTC_FREQ;
98}
99
100static bool toy_enabled(LS7ARtcState *s)
101{
102 return FIELD_EX32(s->cntrctl, RTC_CTRL, TOYEN) &&
103 FIELD_EX32(s->cntrctl, RTC_CTRL, EO);
104}
105
106static bool rtc_enabled(LS7ARtcState *s)
107{
108 return FIELD_EX32(s->cntrctl, RTC_CTRL, RTCEN) &&
109 FIELD_EX32(s->cntrctl, RTC_CTRL, EO);
110}
111
112
113static uint64_t toy_time_to_val_mon(const struct tm *tm)
114{
115 uint64_t val = 0;
116
117 val = FIELD_DP32(val, TOY, MON, tm->tm_mon + 1);
118 val = FIELD_DP32(val, TOY, DAY, tm->tm_mday);
119 val = FIELD_DP32(val, TOY, HOUR, tm->tm_hour);
120 val = FIELD_DP32(val, TOY, MIN, tm->tm_min);
121 val = FIELD_DP32(val, TOY, SEC, tm->tm_sec);
122 return val;
123}
124
125static void toymatch_val_to_time(LS7ARtcState *s, uint64_t val, struct tm *tm)
126{
127 qemu_get_timedate(tm, s->offset_toy);
128 tm->tm_sec = FIELD_EX32(val, TOY_MATCH, SEC);
129 tm->tm_min = FIELD_EX32(val, TOY_MATCH, MIN);
130 tm->tm_hour = FIELD_EX32(val, TOY_MATCH, HOUR);
131 tm->tm_mday = FIELD_EX32(val, TOY_MATCH, DAY);
132 tm->tm_mon = FIELD_EX32(val, TOY_MATCH, MON) - 1;
133 tm->tm_year += (FIELD_EX32(val, TOY_MATCH, YEAR) - (tm->tm_year & 0x3f));
134}
135
136static void toymatch_write(LS7ARtcState *s, uint64_t val, int num)
137{
138 int64_t now, expire_time;
139 struct tm tm = {};
140
141
142 if (toy_enabled(s)) {
143 s->toymatch[num] = val;
144
145 now = qemu_clock_get_ms(rtc_clock);
146 toymatch_val_to_time(s, val, &tm);
147 expire_time = now + (qemu_timedate_diff(&tm) - s->offset_toy) * 1000;
148 timer_mod(s->toy_timer[num], expire_time);
149 }
150}
151
152static void rtcmatch_write(LS7ARtcState *s, uint64_t val, int num)
153{
154 uint64_t expire_ns;
155
156
157 if (rtc_enabled(s)) {
158 s->rtcmatch[num] = val;
159
160 expire_ns = ticks_to_ns(val) - ticks_to_ns(s->offset_rtc);
161 timer_mod_ns(s->rtc_timer[num], expire_ns);
162 }
163}
164
165static void ls7a_toy_stop(LS7ARtcState *s)
166{
167 int i;
168
169
170 for (i = 0; i < TIMER_NUMS; i++) {
171 timer_del(s->toy_timer[i]);
172 }
173}
174
175static void ls7a_rtc_stop(LS7ARtcState *s)
176{
177 int i;
178
179
180 for (i = 0; i < TIMER_NUMS; i++) {
181 timer_del(s->rtc_timer[i]);
182 }
183}
184
185static void ls7a_toy_start(LS7ARtcState *s)
186{
187 int i;
188 uint64_t expire_time, now;
189 struct tm tm = {};
190
191 now = qemu_clock_get_ms(rtc_clock);
192
193
194 for (i = 0; i < TIMER_NUMS; i++) {
195 toymatch_val_to_time(s, s->toymatch[i], &tm);
196 expire_time = now + (qemu_timedate_diff(&tm) - s->offset_toy) * 1000;
197 timer_mod(s->toy_timer[i], expire_time);
198 }
199}
200
201static void ls7a_rtc_start(LS7ARtcState *s)
202{
203 int i;
204 uint64_t expire_time;
205
206
207 for (i = 0; i < TIMER_NUMS; i++) {
208 expire_time = ticks_to_ns(s->rtcmatch[i]) - ticks_to_ns(s->offset_rtc);
209 timer_mod_ns(s->rtc_timer[i], expire_time);
210 }
211}
212
213static uint64_t ls7a_rtc_read(void *opaque, hwaddr addr, unsigned size)
214{
215 LS7ARtcState *s = LS7A_RTC(opaque);
216 struct tm tm;
217 int val = 0;
218
219 switch (addr) {
220 case SYS_TOYREAD0:
221 if (toy_enabled(s)) {
222 qemu_get_timedate(&tm, s->offset_toy);
223 val = toy_time_to_val_mon(&tm);
224 } else {
225
226 val = 0;
227 }
228 break;
229 case SYS_TOYREAD1:
230 if (toy_enabled(s)) {
231 qemu_get_timedate(&tm, s->offset_toy);
232 val = tm.tm_year;
233 } else {
234
235 val = 0;
236 }
237 break;
238 case SYS_TOYMATCH0:
239 val = s->toymatch[0];
240 break;
241 case SYS_TOYMATCH1:
242 val = s->toymatch[1];
243 break;
244 case SYS_TOYMATCH2:
245 val = s->toymatch[2];
246 break;
247 case SYS_RTCCTRL:
248 val = s->cntrctl;
249 break;
250 case SYS_RTCREAD0:
251 if (rtc_enabled(s)) {
252 val = ls7a_rtc_ticks() + s->offset_rtc;
253 } else {
254
255 val = 0;
256 }
257 break;
258 case SYS_RTCMATCH0:
259 val = s->rtcmatch[0];
260 break;
261 case SYS_RTCMATCH1:
262 val = s->rtcmatch[1];
263 break;
264 case SYS_RTCMATCH2:
265 val = s->rtcmatch[2];
266 break;
267 default:
268 val = 0;
269 break;
270 }
271 return val;
272}
273
274static void ls7a_rtc_write(void *opaque, hwaddr addr,
275 uint64_t val, unsigned size)
276{
277 int old_toyen, old_rtcen, new_toyen, new_rtcen;
278 LS7ARtcState *s = LS7A_RTC(opaque);
279 struct tm tm;
280
281 switch (addr) {
282 case SYS_TOYWRITE0:
283
284 if (toy_enabled(s)) {
285 qemu_get_timedate(&tm, s->offset_toy);
286 tm.tm_sec = FIELD_EX32(val, TOY, SEC);
287 tm.tm_min = FIELD_EX32(val, TOY, MIN);
288 tm.tm_hour = FIELD_EX32(val, TOY, HOUR);
289 tm.tm_mday = FIELD_EX32(val, TOY, DAY);
290 tm.tm_mon = FIELD_EX32(val, TOY, MON) - 1;
291 s->offset_toy = qemu_timedate_diff(&tm);
292 }
293 break;
294 case SYS_TOYWRITE1:
295 if (toy_enabled(s)) {
296 qemu_get_timedate(&tm, s->offset_toy);
297 tm.tm_year = val;
298 s->offset_toy = qemu_timedate_diff(&tm);
299 }
300 break;
301 case SYS_TOYMATCH0:
302 toymatch_write(s, val, 0);
303 break;
304 case SYS_TOYMATCH1:
305 toymatch_write(s, val, 1);
306 break;
307 case SYS_TOYMATCH2:
308 toymatch_write(s, val, 2);
309 break;
310 case SYS_RTCCTRL:
311
312 old_toyen = toy_enabled(s);
313 old_rtcen = rtc_enabled(s);
314
315 s->cntrctl = val;
316
317 new_toyen = toy_enabled(s);
318 new_rtcen = rtc_enabled(s);
319
320
321
322
323
324 if (old_toyen != new_toyen) {
325 if (new_toyen) {
326 ls7a_toy_start(s);
327 } else {
328 ls7a_toy_stop(s);
329 }
330 }
331 if (old_rtcen != new_rtcen) {
332 if (new_rtcen) {
333 ls7a_rtc_start(s);
334 } else {
335 ls7a_rtc_stop(s);
336 }
337 }
338 break;
339 case SYS_RTCWRTIE0:
340 if (rtc_enabled(s)) {
341 s->offset_rtc = val - ls7a_rtc_ticks();
342 }
343 break;
344 case SYS_RTCMATCH0:
345 rtcmatch_write(s, val, 0);
346 break;
347 case SYS_RTCMATCH1:
348 rtcmatch_write(s, val, 1);
349 break;
350 case SYS_RTCMATCH2:
351 rtcmatch_write(s, val, 2);
352 break;
353 default:
354 break;
355 }
356}
357
358static const MemoryRegionOps ls7a_rtc_ops = {
359 .read = ls7a_rtc_read,
360 .write = ls7a_rtc_write,
361 .endianness = DEVICE_LITTLE_ENDIAN,
362 .valid = {
363 .min_access_size = 4,
364 .max_access_size = 4,
365 },
366};
367
368static void toy_timer_cb(void *opaque)
369{
370 LS7ARtcState *s = opaque;
371
372 if (toy_enabled(s)) {
373 qemu_irq_raise(s->irq);
374 }
375}
376
377static void rtc_timer_cb(void *opaque)
378{
379 LS7ARtcState *s = opaque;
380
381 if (rtc_enabled(s)) {
382 qemu_irq_raise(s->irq);
383 }
384}
385
386static void ls7a_rtc_realize(DeviceState *dev, Error **errp)
387{
388 int i;
389 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
390 LS7ARtcState *d = LS7A_RTC(sbd);
391 memory_region_init_io(&d->iomem, NULL, &ls7a_rtc_ops,
392 (void *)d, "ls7a_rtc", 0x100);
393
394 sysbus_init_irq(sbd, &d->irq);
395
396 sysbus_init_mmio(sbd, &d->iomem);
397 for (i = 0; i < TIMER_NUMS; i++) {
398 d->toymatch[i] = 0;
399 d->rtcmatch[i] = 0;
400 d->toy_timer[i] = timer_new_ms(rtc_clock, toy_timer_cb, d);
401 d->rtc_timer[i] = timer_new_ms(rtc_clock, rtc_timer_cb, d);
402 }
403 d->offset_toy = 0;
404 d->offset_rtc = 0;
405
406}
407
408
409static void ls7a_rtc_reset(DeviceState *dev)
410{
411 int i;
412 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
413 LS7ARtcState *d = LS7A_RTC(sbd);
414 for (i = 0; i < TIMER_NUMS; i++) {
415 if (toy_enabled(d)) {
416 timer_del(d->toy_timer[i]);
417 }
418 if (rtc_enabled(d)) {
419 timer_del(d->rtc_timer[i]);
420 }
421 d->toymatch[i] = 0;
422 d->rtcmatch[i] = 0;
423 }
424 d->cntrctl = 0;
425}
426
427static int ls7a_rtc_pre_save(void *opaque)
428{
429 LS7ARtcState *s = LS7A_RTC(opaque);
430
431 ls7a_toy_stop(s);
432 ls7a_rtc_stop(s);
433
434 return 0;
435}
436
437static int ls7a_rtc_post_load(void *opaque, int version_id)
438{
439 LS7ARtcState *s = LS7A_RTC(opaque);
440 if (toy_enabled(s)) {
441 ls7a_toy_start(s);
442 }
443
444 if (rtc_enabled(s)) {
445 ls7a_rtc_start(s);
446 }
447
448 return 0;
449}
450
451static const VMStateDescription vmstate_ls7a_rtc = {
452 .name = "ls7a_rtc",
453 .version_id = 1,
454 .minimum_version_id = 1,
455 .pre_save = ls7a_rtc_pre_save,
456 .post_load = ls7a_rtc_post_load,
457 .fields = (VMStateField[]) {
458 VMSTATE_INT64(offset_toy, LS7ARtcState),
459 VMSTATE_INT64(offset_rtc, LS7ARtcState),
460 VMSTATE_UINT32_ARRAY(toymatch, LS7ARtcState, TIMER_NUMS),
461 VMSTATE_UINT32_ARRAY(rtcmatch, LS7ARtcState, TIMER_NUMS),
462 VMSTATE_UINT32(cntrctl, LS7ARtcState),
463 VMSTATE_END_OF_LIST()
464 }
465};
466
467static void ls7a_rtc_class_init(ObjectClass *klass, void *data)
468{
469 DeviceClass *dc = DEVICE_CLASS(klass);
470 dc->vmsd = &vmstate_ls7a_rtc;
471 dc->realize = ls7a_rtc_realize;
472 dc->reset = ls7a_rtc_reset;
473 dc->desc = "ls7a rtc";
474}
475
476static const TypeInfo ls7a_rtc_info = {
477 .name = TYPE_LS7A_RTC,
478 .parent = TYPE_SYS_BUS_DEVICE,
479 .instance_size = sizeof(LS7ARtcState),
480 .class_init = ls7a_rtc_class_init,
481};
482
483static void ls7a_rtc_register_types(void)
484{
485 type_register_static(&ls7a_rtc_info);
486}
487
488type_init(ls7a_rtc_register_types)
489
