aboutsummaryrefslogtreecommitdiff
path: root/hw/rtc/ls7a_rtc.c
blob: 1f9e38a735bd75886908e7009f14a26ca1e6261d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Loongarch LS7A Real Time Clock emulation
 *
 * Copyright (C) 2021 Loongson Technology Corporation Limited
 */

#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "hw/irq.h"
#include "include/hw/register.h"
#include "qemu/timer.h"
#include "sysemu/sysemu.h"
#include "qemu/cutils.h"
#include "qemu/log.h"
#include "migration/vmstate.h"
#include "hw/misc/unimp.h"
#include "sysemu/rtc.h"
#include "hw/registerfields.h"

#define SYS_TOYTRIM        0x20
#define SYS_TOYWRITE0      0x24
#define SYS_TOYWRITE1      0x28
#define SYS_TOYREAD0       0x2C
#define SYS_TOYREAD1       0x30
#define SYS_TOYMATCH0      0x34
#define SYS_TOYMATCH1      0x38
#define SYS_TOYMATCH2      0x3C
#define SYS_RTCCTRL        0x40
#define SYS_RTCTRIM        0x60
#define SYS_RTCWRTIE0      0x64
#define SYS_RTCREAD0       0x68
#define SYS_RTCMATCH0      0x6C
#define SYS_RTCMATCH1      0x70
#define SYS_RTCMATCH2      0x74

#define LS7A_RTC_FREQ     32768
#define TIMER_NUMS        3
/*
 * Shift bits and filed mask
 */

FIELD(TOY, MON, 26, 6)
FIELD(TOY, DAY, 21, 5)
FIELD(TOY, HOUR, 16, 5)
FIELD(TOY, MIN, 10, 6)
FIELD(TOY, SEC, 4, 6)
FIELD(TOY, MSEC, 0, 4)

FIELD(TOY_MATCH, YEAR, 26, 6)
FIELD(TOY_MATCH, MON, 22, 4)
FIELD(TOY_MATCH, DAY, 17, 5)
FIELD(TOY_MATCH, HOUR, 12, 5)
FIELD(TOY_MATCH, MIN, 6, 6)
FIELD(TOY_MATCH, SEC, 0, 6)

FIELD(RTC_CTRL, RTCEN, 13, 1)
FIELD(RTC_CTRL, TOYEN, 11, 1)
FIELD(RTC_CTRL, EO, 8, 1)

#define TYPE_LS7A_RTC "ls7a_rtc"
OBJECT_DECLARE_SIMPLE_TYPE(LS7ARtcState, LS7A_RTC)

struct LS7ARtcState {
    SysBusDevice parent_obj;

    MemoryRegion iomem;
    /*
     * Needed to preserve the tick_count across migration, even if the
     * absolute value of the rtc_clock is different on the source and
     * destination.
     */
    int64_t offset_toy;
    int64_t offset_rtc;
    int64_t data;
    int tidx;
    uint32_t toymatch[3];
    uint32_t toytrim;
    uint32_t cntrctl;
    uint32_t rtctrim;
    uint32_t rtccount;
    uint32_t rtcmatch[3];
    QEMUTimer *toy_timer[TIMER_NUMS];
    QEMUTimer *rtc_timer[TIMER_NUMS];
    qemu_irq irq;
};

/* switch nanoseconds time to rtc ticks */
static uint64_t ls7a_rtc_ticks(void)
{
    return qemu_clock_get_ns(rtc_clock) * LS7A_RTC_FREQ / NANOSECONDS_PER_SECOND;
}

/* switch rtc ticks to nanoseconds */
static uint64_t ticks_to_ns(uint64_t ticks)
{
    return ticks * NANOSECONDS_PER_SECOND / LS7A_RTC_FREQ;
}

static bool toy_enabled(LS7ARtcState *s)
{
    return FIELD_EX32(s->cntrctl, RTC_CTRL, TOYEN) &&
           FIELD_EX32(s->cntrctl, RTC_CTRL, EO);
}

static bool rtc_enabled(LS7ARtcState *s)
{
    return FIELD_EX32(s->cntrctl, RTC_CTRL, RTCEN) &&
           FIELD_EX32(s->cntrctl, RTC_CTRL, EO);
}

/* parse struct tm to toy value */
static uint64_t toy_time_to_val_mon(const struct tm *tm)
{
    uint64_t val = 0;

    val = FIELD_DP32(val, TOY, MON, tm->tm_mon + 1);
    val = FIELD_DP32(val, TOY, DAY, tm->tm_mday);
    val = FIELD_DP32(val, TOY, HOUR, tm->tm_hour);
    val = FIELD_DP32(val, TOY, MIN, tm->tm_min);
    val = FIELD_DP32(val, TOY, SEC, tm->tm_sec);
    return val;
}

static void toymatch_val_to_time(LS7ARtcState *s, uint64_t val, struct tm *tm)
{
    qemu_get_timedate(tm, s->offset_toy);
    tm->tm_sec = FIELD_EX32(val, TOY_MATCH, SEC);
    tm->tm_min = FIELD_EX32(val, TOY_MATCH, MIN);
    tm->tm_hour = FIELD_EX32(val, TOY_MATCH, HOUR);
    tm->tm_mday = FIELD_EX32(val, TOY_MATCH, DAY);
    tm->tm_mon = FIELD_EX32(val, TOY_MATCH, MON) - 1;
    tm->tm_year += (FIELD_EX32(val, TOY_MATCH, YEAR) - (tm->tm_year & 0x3f));
}

static void toymatch_write(LS7ARtcState *s, uint64_t val, int num)
{
    int64_t now, expire_time;
    struct tm tm = {};

    /* it do not support write when toy disabled */
    if (toy_enabled(s)) {
        s->toymatch[num] = val;
        /* calculate expire time */
        now = qemu_clock_get_ms(rtc_clock);
        toymatch_val_to_time(s, val, &tm);
        expire_time = now + (qemu_timedate_diff(&tm) - s->offset_toy) * 1000;
        timer_mod(s->toy_timer[num], expire_time);
    }
}

static void rtcmatch_write(LS7ARtcState *s, uint64_t val, int num)
{
    uint64_t expire_ns;

    /* it do not support write when toy disabled */
    if (rtc_enabled(s)) {
        s->rtcmatch[num] = val;
        /* calculate expire time */
        expire_ns = ticks_to_ns(val) - ticks_to_ns(s->offset_rtc);
        timer_mod_ns(s->rtc_timer[num], expire_ns);
    }
}

static void ls7a_toy_stop(LS7ARtcState *s)
{
    int i;

    /* delete timers, and when re-enabled, recalculate expire time */
    for (i = 0; i < TIMER_NUMS; i++) {
        timer_del(s->toy_timer[i]);
    }
}

static void ls7a_rtc_stop(LS7ARtcState *s)
{
    int i;

    /* delete timers, and when re-enabled, recalculate expire time */
    for (i = 0; i < TIMER_NUMS; i++) {
        timer_del(s->rtc_timer[i]);
    }
}

static void ls7a_toy_start(LS7ARtcState *s)
{
    int i;
    uint64_t expire_time, now;
    struct tm tm = {};

    now = qemu_clock_get_ms(rtc_clock);

    /* recalculate expire time and enable timer */
    for (i = 0; i < TIMER_NUMS; i++) {
        toymatch_val_to_time(s, s->toymatch[i], &tm);
        expire_time = now + (qemu_timedate_diff(&tm) - s->offset_toy) * 1000;
        timer_mod(s->toy_timer[i], expire_time);
    }
}

static void ls7a_rtc_start(LS7ARtcState *s)
{
    int i;
    uint64_t expire_time;

    /* recalculate expire time and enable timer */
    for (i = 0; i < TIMER_NUMS; i++) {
        expire_time = ticks_to_ns(s->rtcmatch[i]) - ticks_to_ns(s->offset_rtc);
        timer_mod_ns(s->rtc_timer[i], expire_time);
    }
}

static uint64_t ls7a_rtc_read(void *opaque, hwaddr addr, unsigned size)
{
    LS7ARtcState *s = LS7A_RTC(opaque);
    struct tm tm;
    int val = 0;

    switch (addr) {
    case SYS_TOYREAD0:
        if (toy_enabled(s)) {
            qemu_get_timedate(&tm, s->offset_toy);
            val = toy_time_to_val_mon(&tm);
        } else {
            /* return 0 when toy disabled */
            val = 0;
        }
        break;
    case SYS_TOYREAD1:
        if (toy_enabled(s)) {
            qemu_get_timedate(&tm, s->offset_toy);
            val = tm.tm_year;
        } else {
            /* return 0 when toy disabled */
            val = 0;
        }
        break;
    case SYS_TOYMATCH0:
        val = s->toymatch[0];
        break;
    case SYS_TOYMATCH1:
        val = s->toymatch[1];
        break;
    case SYS_TOYMATCH2:
        val = s->toymatch[2];
        break;
    case SYS_RTCCTRL:
        val = s->cntrctl;
        break;
    case SYS_RTCREAD0:
        if (rtc_enabled(s)) {
            val = ls7a_rtc_ticks() + s->offset_rtc;
        } else {
            /* return 0 when rtc disabled */
            val = 0;
        }
        break;
    case SYS_RTCMATCH0:
        val = s->rtcmatch[0];
        break;
    case SYS_RTCMATCH1:
        val = s->rtcmatch[1];
        break;
    case SYS_RTCMATCH2:
        val = s->rtcmatch[2];
        break;
    default:
        val = 0;
        break;
    }
    return val;
}

static void ls7a_rtc_write(void *opaque, hwaddr addr,
                           uint64_t val, unsigned size)
{
    int old_toyen, old_rtcen, new_toyen, new_rtcen;
    LS7ARtcState *s = LS7A_RTC(opaque);
    struct tm tm;

    switch (addr) {
    case SYS_TOYWRITE0:
        /* it do not support write when toy disabled */
        if (toy_enabled(s)) {
            qemu_get_timedate(&tm, s->offset_toy);
            tm.tm_sec = FIELD_EX32(val, TOY, SEC);
            tm.tm_min = FIELD_EX32(val, TOY, MIN);
            tm.tm_hour = FIELD_EX32(val, TOY, HOUR);
            tm.tm_mday = FIELD_EX32(val, TOY, DAY);
            tm.tm_mon = FIELD_EX32(val, TOY, MON) - 1;
            s->offset_toy = qemu_timedate_diff(&tm);
        }
    break;
    case SYS_TOYWRITE1:
        if (toy_enabled(s)) {
            qemu_get_timedate(&tm, s->offset_toy);
            tm.tm_year = val;
            s->offset_toy = qemu_timedate_diff(&tm);
        }
        break;
    case SYS_TOYMATCH0:
        toymatch_write(s, val, 0);
        break;
    case SYS_TOYMATCH1:
        toymatch_write(s, val, 1);
        break;
    case SYS_TOYMATCH2:
        toymatch_write(s, val, 2);
        break;
    case SYS_RTCCTRL:
        /* get old ctrl */
        old_toyen = toy_enabled(s);
        old_rtcen = rtc_enabled(s);

        s->cntrctl = val;
        /* get new ctrl */
        new_toyen = toy_enabled(s);
        new_rtcen = rtc_enabled(s);

        /*
         * we do not consider if EO changed, as it always set at most time.
         * toy or rtc enabled should start timer. otherwise, stop timer
         */
        if (old_toyen != new_toyen) {
            if (new_toyen) {
                ls7a_toy_start(s);
            } else {
                ls7a_toy_stop(s);
            }
        }
        if (old_rtcen != new_rtcen) {
            if (new_rtcen) {
                ls7a_rtc_start(s);
            } else {
                ls7a_rtc_stop(s);
            }
        }
        break;
    case SYS_RTCWRTIE0:
        if (rtc_enabled(s)) {
            s->offset_rtc = val - ls7a_rtc_ticks();
        }
        break;
    case SYS_RTCMATCH0:
        rtcmatch_write(s, val, 0);
        break;
    case SYS_RTCMATCH1:
        rtcmatch_write(s, val, 1);
        break;
    case SYS_RTCMATCH2:
        rtcmatch_write(s, val, 2);
        break;
    default:
        break;
    }
}

static const MemoryRegionOps ls7a_rtc_ops = {
    .read = ls7a_rtc_read,
    .write = ls7a_rtc_write,
    .endianness = DEVICE_LITTLE_ENDIAN,
    .valid = {
        .min_access_size = 4,
        .max_access_size = 4,
    },
};

static void toy_timer_cb(void *opaque)
{
    LS7ARtcState *s = opaque;

    if (toy_enabled(s)) {
        qemu_irq_raise(s->irq);
    }
}

static void rtc_timer_cb(void *opaque)
{
    LS7ARtcState *s = opaque;

    if (rtc_enabled(s)) {
        qemu_irq_raise(s->irq);
    }
}

static void ls7a_rtc_realize(DeviceState *dev, Error **errp)
{
    int i;
    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
    LS7ARtcState *d = LS7A_RTC(sbd);
    memory_region_init_io(&d->iomem, NULL, &ls7a_rtc_ops,
                         (void *)d, "ls7a_rtc", 0x100);

    sysbus_init_irq(sbd, &d->irq);

    sysbus_init_mmio(sbd, &d->iomem);
    for (i = 0; i < TIMER_NUMS; i++) {
        d->toymatch[i] = 0;
        d->rtcmatch[i] = 0;
        d->toy_timer[i] = timer_new_ms(rtc_clock, toy_timer_cb, d);
        d->rtc_timer[i] = timer_new_ms(rtc_clock, rtc_timer_cb, d);
    }
    d->offset_toy = 0;
    d->offset_rtc = 0;

}

/* delete timer and clear reg when reset */
static void ls7a_rtc_reset(DeviceState *dev)
{
    int i;
    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
    LS7ARtcState *d = LS7A_RTC(sbd);
    for (i = 0; i < TIMER_NUMS; i++) {
        if (toy_enabled(d)) {
            timer_del(d->toy_timer[i]);
        }
        if (rtc_enabled(d)) {
            timer_del(d->rtc_timer[i]);
        }
        d->toymatch[i] = 0;
        d->rtcmatch[i] = 0;
    }
    d->cntrctl = 0;
}

static int ls7a_rtc_pre_save(void *opaque)
{
    LS7ARtcState *s = LS7A_RTC(opaque);

    ls7a_toy_stop(s);
    ls7a_rtc_stop(s);

    return 0;
}

static int ls7a_rtc_post_load(void *opaque, int version_id)
{
    LS7ARtcState *s = LS7A_RTC(opaque);
    if (toy_enabled(s)) {
        ls7a_toy_start(s);
    }

    if (rtc_enabled(s)) {
        ls7a_rtc_start(s);
    }

    return 0;
}

static const VMStateDescription vmstate_ls7a_rtc = {
    .name = "ls7a_rtc",
    .version_id = 1,
    .minimum_version_id = 1,
    .pre_save = ls7a_rtc_pre_save,
    .post_load = ls7a_rtc_post_load,
    .fields = (VMStateField[]) {
        VMSTATE_INT64(offset_toy, LS7ARtcState),
        VMSTATE_INT64(offset_rtc, LS7ARtcState),
        VMSTATE_UINT32_ARRAY(toymatch, LS7ARtcState, TIMER_NUMS),
        VMSTATE_UINT32_ARRAY(rtcmatch, LS7ARtcState, TIMER_NUMS),
        VMSTATE_UINT32(cntrctl, LS7ARtcState),
        VMSTATE_END_OF_LIST()
    }
};

static void ls7a_rtc_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    dc->vmsd = &vmstate_ls7a_rtc;
    dc->realize = ls7a_rtc_realize;
    dc->reset = ls7a_rtc_reset;
    dc->desc = "ls7a rtc";
}

static const TypeInfo ls7a_rtc_info = {
    .name          = TYPE_LS7A_RTC,
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(LS7ARtcState),
    .class_init    = ls7a_rtc_class_init,
};

static void ls7a_rtc_register_types(void)
{
    type_register_static(&ls7a_rtc_info);
}

type_init(ls7a_rtc_register_types)