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Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-migration-20210726a...
[qemu/armbru.git] / hw / rtc / allwinner-rtc.c
blob5606a51d5c556bd7e2b1b0322e8208947815db87
1 /*
2 * Allwinner Real Time Clock emulation
3 *
4 * Copyright (C) 2019 Niek Linnenbank <nieklinnenbank@gmail.com>
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "qemu/units.h"
22 #include "hw/sysbus.h"
23 #include "migration/vmstate.h"
24 #include "qemu/log.h"
25 #include "qemu/module.h"
26 #include "qemu-common.h"
27 #include "hw/qdev-properties.h"
28 #include "hw/rtc/allwinner-rtc.h"
29 #include "trace.h"
30
31 /* RTC registers */
32 enum {
33 REG_LOSC = 1, /* Low Oscillator Control */
34 REG_YYMMDD, /* RTC Year-Month-Day */
35 REG_HHMMSS, /* RTC Hour-Minute-Second */
36 REG_ALARM1_WKHHMMSS, /* Alarm1 Week Hour-Minute-Second */
37 REG_ALARM1_EN, /* Alarm1 Enable */
38 REG_ALARM1_IRQ_EN, /* Alarm1 IRQ Enable */
39 REG_ALARM1_IRQ_STA, /* Alarm1 IRQ Status */
40 REG_GP0, /* General Purpose Register 0 */
41 REG_GP1, /* General Purpose Register 1 */
42 REG_GP2, /* General Purpose Register 2 */
43 REG_GP3, /* General Purpose Register 3 */
44
45 /* sun4i registers */
46 REG_ALARM1_DDHHMMSS, /* Alarm1 Day Hour-Minute-Second */
47 REG_CPUCFG, /* CPU Configuration Register */
48
49 /* sun6i registers */
50 REG_LOSC_AUTOSTA, /* LOSC Auto Switch Status */
51 REG_INT_OSC_PRE, /* Internal OSC Clock Prescaler */
52 REG_ALARM0_COUNTER, /* Alarm0 Counter */
53 REG_ALARM0_CUR_VLU, /* Alarm0 Counter Current Value */
54 REG_ALARM0_ENABLE, /* Alarm0 Enable */
55 REG_ALARM0_IRQ_EN, /* Alarm0 IRQ Enable */
56 REG_ALARM0_IRQ_STA, /* Alarm0 IRQ Status */
57 REG_ALARM_CONFIG, /* Alarm Config */
58 REG_LOSC_OUT_GATING, /* LOSC Output Gating Register */
59 REG_GP4, /* General Purpose Register 4 */
60 REG_GP5, /* General Purpose Register 5 */
61 REG_GP6, /* General Purpose Register 6 */
62 REG_GP7, /* General Purpose Register 7 */
63 REG_RTC_DBG, /* RTC Debug Register */
64 REG_GPL_HOLD_OUT, /* GPL Hold Output Register */
65 REG_VDD_RTC, /* VDD RTC Regulate Register */
66 REG_IC_CHARA, /* IC Characteristics Register */
67 };
68
69 /* RTC register flags */
70 enum {
71 REG_LOSC_YMD = (1 << 7),
72 REG_LOSC_HMS = (1 << 8),
73 };
74
75 /* RTC sun4i register map (offset to name) */
76 const uint8_t allwinner_rtc_sun4i_regmap[] = {
77 [0x0000] = REG_LOSC,
78 [0x0004] = REG_YYMMDD,
79 [0x0008] = REG_HHMMSS,
80 [0x000C] = REG_ALARM1_DDHHMMSS,
81 [0x0010] = REG_ALARM1_WKHHMMSS,
82 [0x0014] = REG_ALARM1_EN,
83 [0x0018] = REG_ALARM1_IRQ_EN,
84 [0x001C] = REG_ALARM1_IRQ_STA,
85 [0x0020] = REG_GP0,
86 [0x0024] = REG_GP1,
87 [0x0028] = REG_GP2,
88 [0x002C] = REG_GP3,
89 [0x003C] = REG_CPUCFG,
90 };
91
92 /* RTC sun6i register map (offset to name) */
93 const uint8_t allwinner_rtc_sun6i_regmap[] = {
94 [0x0000] = REG_LOSC,
95 [0x0004] = REG_LOSC_AUTOSTA,
96 [0x0008] = REG_INT_OSC_PRE,
97 [0x0010] = REG_YYMMDD,
98 [0x0014] = REG_HHMMSS,
99 [0x0020] = REG_ALARM0_COUNTER,
100 [0x0024] = REG_ALARM0_CUR_VLU,
101 [0x0028] = REG_ALARM0_ENABLE,
102 [0x002C] = REG_ALARM0_IRQ_EN,
103 [0x0030] = REG_ALARM0_IRQ_STA,
104 [0x0040] = REG_ALARM1_WKHHMMSS,
105 [0x0044] = REG_ALARM1_EN,
106 [0x0048] = REG_ALARM1_IRQ_EN,
107 [0x004C] = REG_ALARM1_IRQ_STA,
108 [0x0050] = REG_ALARM_CONFIG,
109 [0x0060] = REG_LOSC_OUT_GATING,
110 [0x0100] = REG_GP0,
111 [0x0104] = REG_GP1,
112 [0x0108] = REG_GP2,
113 [0x010C] = REG_GP3,
114 [0x0110] = REG_GP4,
115 [0x0114] = REG_GP5,
116 [0x0118] = REG_GP6,
117 [0x011C] = REG_GP7,
118 [0x0170] = REG_RTC_DBG,
119 [0x0180] = REG_GPL_HOLD_OUT,
120 [0x0190] = REG_VDD_RTC,
121 [0x01F0] = REG_IC_CHARA,
122 };
123
124 static bool allwinner_rtc_sun4i_read(AwRtcState *s, uint32_t offset)
125 {
126 /* no sun4i specific registers currently implemented */
127 return false;
128 }
129
130 static bool allwinner_rtc_sun4i_write(AwRtcState *s, uint32_t offset,
131 uint32_t data)
132 {
133 /* no sun4i specific registers currently implemented */
134 return false;
135 }
136
137 static bool allwinner_rtc_sun6i_read(AwRtcState *s, uint32_t offset)
138 {
139 const AwRtcClass *c = AW_RTC_GET_CLASS(s);
140
141 switch (c->regmap[offset]) {
142 case REG_GP4: /* General Purpose Register 4 */
143 case REG_GP5: /* General Purpose Register 5 */
144 case REG_GP6: /* General Purpose Register 6 */
145 case REG_GP7: /* General Purpose Register 7 */
146 return true;
147 default:
148 break;
149 }
150 return false;
151 }
152
153 static bool allwinner_rtc_sun6i_write(AwRtcState *s, uint32_t offset,
154 uint32_t data)
155 {
156 const AwRtcClass *c = AW_RTC_GET_CLASS(s);
157
158 switch (c->regmap[offset]) {
159 case REG_GP4: /* General Purpose Register 4 */
160 case REG_GP5: /* General Purpose Register 5 */
161 case REG_GP6: /* General Purpose Register 6 */
162 case REG_GP7: /* General Purpose Register 7 */
163 return true;
164 default:
165 break;
166 }
167 return false;
168 }
169
170 static uint64_t allwinner_rtc_read(void *opaque, hwaddr offset,
171 unsigned size)
172 {
173 AwRtcState *s = AW_RTC(opaque);
174 const AwRtcClass *c = AW_RTC_GET_CLASS(s);
175 uint64_t val = 0;
176
177 if (offset >= c->regmap_size) {
178 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
179 __func__, (uint32_t)offset);
180 return 0;
181 }
182
183 if (!c->regmap[offset]) {
184 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register 0x%04x\n",
185 __func__, (uint32_t)offset);
186 return 0;
187 }
188
189 switch (c->regmap[offset]) {
190 case REG_LOSC: /* Low Oscillator Control */
191 val = s->regs[REG_LOSC];
192 s->regs[REG_LOSC] &= ~(REG_LOSC_YMD | REG_LOSC_HMS);
193 break;
194 case REG_YYMMDD: /* RTC Year-Month-Day */
195 case REG_HHMMSS: /* RTC Hour-Minute-Second */
196 case REG_GP0: /* General Purpose Register 0 */
197 case REG_GP1: /* General Purpose Register 1 */
198 case REG_GP2: /* General Purpose Register 2 */
199 case REG_GP3: /* General Purpose Register 3 */
200 val = s->regs[c->regmap[offset]];
201 break;
202 default:
203 if (!c->read(s, offset)) {
204 qemu_log_mask(LOG_UNIMP, "%s: unimplemented register 0x%04x\n",
205 __func__, (uint32_t)offset);
206 }
207 val = s->regs[c->regmap[offset]];
208 break;
209 }
210
211 trace_allwinner_rtc_read(offset, val);
212 return val;
213 }
214
215 static void allwinner_rtc_write(void *opaque, hwaddr offset,
216 uint64_t val, unsigned size)
217 {
218 AwRtcState *s = AW_RTC(opaque);
219 const AwRtcClass *c = AW_RTC_GET_CLASS(s);
220
221 if (offset >= c->regmap_size) {
222 qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
223 __func__, (uint32_t)offset);
224 return;
225 }
226
227 if (!c->regmap[offset]) {
228 qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register 0x%04x\n",
229 __func__, (uint32_t)offset);
230 return;
231 }
232
233 trace_allwinner_rtc_write(offset, val);
234
235 switch (c->regmap[offset]) {
236 case REG_YYMMDD: /* RTC Year-Month-Day */
237 s->regs[REG_YYMMDD] = val;
238 s->regs[REG_LOSC] |= REG_LOSC_YMD;
239 break;
240 case REG_HHMMSS: /* RTC Hour-Minute-Second */
241 s->regs[REG_HHMMSS] = val;
242 s->regs[REG_LOSC] |= REG_LOSC_HMS;
243 break;
244 case REG_GP0: /* General Purpose Register 0 */
245 case REG_GP1: /* General Purpose Register 1 */
246 case REG_GP2: /* General Purpose Register 2 */
247 case REG_GP3: /* General Purpose Register 3 */
248 s->regs[c->regmap[offset]] = val;
249 break;
250 default:
251 if (!c->write(s, offset, val)) {
252 qemu_log_mask(LOG_UNIMP, "%s: unimplemented register 0x%04x\n",
253 __func__, (uint32_t)offset);
254 }
255 break;
256 }
257 }
258
259 static const MemoryRegionOps allwinner_rtc_ops = {
260 .read = allwinner_rtc_read,
261 .write = allwinner_rtc_write,
262 .endianness = DEVICE_NATIVE_ENDIAN,
263 .valid = {
264 .min_access_size = 4,
265 .max_access_size = 4,
266 },
267 .impl.min_access_size = 4,
268 };
269
270 static void allwinner_rtc_reset(DeviceState *dev)
271 {
272 AwRtcState *s = AW_RTC(dev);
273 struct tm now;
274
275 /* Clear registers */
276 memset(s->regs, 0, sizeof(s->regs));
277
278 /* Get current datetime */
279 qemu_get_timedate(&now, 0);
280
281 /* Set RTC with current datetime */
282 if (s->base_year > 1900) {
283 s->regs[REG_YYMMDD] = ((now.tm_year + 1900 - s->base_year) << 16) |
284 ((now.tm_mon + 1) << 8) |
285 now.tm_mday;
286 s->regs[REG_HHMMSS] = (((now.tm_wday + 6) % 7) << 29) |
287 (now.tm_hour << 16) |
288 (now.tm_min << 8) |
289 now.tm_sec;
290 }
291 }
292
293 static void allwinner_rtc_init(Object *obj)
294 {
295 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
296 AwRtcState *s = AW_RTC(obj);
297
298 /* Memory mapping */
299 memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_rtc_ops, s,
300 TYPE_AW_RTC, 1 * KiB);
301 sysbus_init_mmio(sbd, &s->iomem);
302 }
303
304 static const VMStateDescription allwinner_rtc_vmstate = {
305 .name = "allwinner-rtc",
306 .version_id = 1,
307 .minimum_version_id = 1,
308 .fields = (VMStateField[]) {
309 VMSTATE_UINT32_ARRAY(regs, AwRtcState, AW_RTC_REGS_NUM),
310 VMSTATE_END_OF_LIST()
311 }
312 };
313
314 static Property allwinner_rtc_properties[] = {
315 DEFINE_PROP_INT32("base-year", AwRtcState, base_year, 0),
316 DEFINE_PROP_END_OF_LIST(),
317 };
318
319 static void allwinner_rtc_class_init(ObjectClass *klass, void *data)
320 {
321 DeviceClass *dc = DEVICE_CLASS(klass);
322
323 dc->reset = allwinner_rtc_reset;
324 dc->vmsd = &allwinner_rtc_vmstate;
325 device_class_set_props(dc, allwinner_rtc_properties);
326 }
327
328 static void allwinner_rtc_sun4i_init(Object *obj)
329 {
330 AwRtcState *s = AW_RTC(obj);
331 s->base_year = 2010;
332 }
333
334 static void allwinner_rtc_sun4i_class_init(ObjectClass *klass, void *data)
335 {
336 AwRtcClass *arc = AW_RTC_CLASS(klass);
337
338 arc->regmap = allwinner_rtc_sun4i_regmap;
339 arc->regmap_size = sizeof(allwinner_rtc_sun4i_regmap);
340 arc->read = allwinner_rtc_sun4i_read;
341 arc->write = allwinner_rtc_sun4i_write;
342 }
343
344 static void allwinner_rtc_sun6i_init(Object *obj)
345 {
346 AwRtcState *s = AW_RTC(obj);
347 s->base_year = 1970;
348 }
349
350 static void allwinner_rtc_sun6i_class_init(ObjectClass *klass, void *data)
351 {
352 AwRtcClass *arc = AW_RTC_CLASS(klass);
353
354 arc->regmap = allwinner_rtc_sun6i_regmap;
355 arc->regmap_size = sizeof(allwinner_rtc_sun6i_regmap);
356 arc->read = allwinner_rtc_sun6i_read;
357 arc->write = allwinner_rtc_sun6i_write;
358 }
359
360 static void allwinner_rtc_sun7i_init(Object *obj)
361 {
362 AwRtcState *s = AW_RTC(obj);
363 s->base_year = 1970;
364 }
365
366 static void allwinner_rtc_sun7i_class_init(ObjectClass *klass, void *data)
367 {
368 AwRtcClass *arc = AW_RTC_CLASS(klass);
369 allwinner_rtc_sun4i_class_init(klass, arc);
370 }
371
372 static const TypeInfo allwinner_rtc_info = {
373 .name = TYPE_AW_RTC,
374 .parent = TYPE_SYS_BUS_DEVICE,
375 .instance_init = allwinner_rtc_init,
376 .instance_size = sizeof(AwRtcState),
377 .class_init = allwinner_rtc_class_init,
378 .class_size = sizeof(AwRtcClass),
379 .abstract = true,
380 };
381
382 static const TypeInfo allwinner_rtc_sun4i_info = {
383 .name = TYPE_AW_RTC_SUN4I,
384 .parent = TYPE_AW_RTC,
385 .class_init = allwinner_rtc_sun4i_class_init,
386 .instance_init = allwinner_rtc_sun4i_init,
387 };
388
389 static const TypeInfo allwinner_rtc_sun6i_info = {
390 .name = TYPE_AW_RTC_SUN6I,
391 .parent = TYPE_AW_RTC,
392 .class_init = allwinner_rtc_sun6i_class_init,
393 .instance_init = allwinner_rtc_sun6i_init,
394 };
395
396 static const TypeInfo allwinner_rtc_sun7i_info = {
397 .name = TYPE_AW_RTC_SUN7I,
398 .parent = TYPE_AW_RTC,
399 .class_init = allwinner_rtc_sun7i_class_init,
400 .instance_init = allwinner_rtc_sun7i_init,
401 };
402
403 static void allwinner_rtc_register(void)
404 {
405 type_register_static(&allwinner_rtc_info);
406 type_register_static(&allwinner_rtc_sun4i_info);
407 type_register_static(&allwinner_rtc_sun6i_info);
408 type_register_static(&allwinner_rtc_sun7i_info);
409 }
410
411 type_init(allwinner_rtc_register)
armbru's QEMU hackery