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25#include "qemu/osdep.h"
26#include "hw/irq.h"
27#include "hw/qdev-properties.h"
28#include "hw/timer/stm32f2xx_timer.h"
29#include "migration/vmstate.h"
30#include "qemu/log.h"
31#include "qemu/module.h"
32
33#ifndef STM_TIMER_ERR_DEBUG
34#define STM_TIMER_ERR_DEBUG 0
35#endif
36
37#define DB_PRINT_L(lvl, fmt, args...) do { \
38 if (STM_TIMER_ERR_DEBUG >= lvl) { \
39 qemu_log("%s: " fmt, __func__, ## args); \
40 } \
41} while (0)
42
43#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)
44
45static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now);
46
47static void stm32f2xx_timer_interrupt(void *opaque)
48{
49 STM32F2XXTimerState *s = opaque;
50
51 DB_PRINT("Interrupt\n");
52
53 if (s->tim_dier & TIM_DIER_UIE && s->tim_cr1 & TIM_CR1_CEN) {
54 s->tim_sr |= 1;
55 qemu_irq_pulse(s->irq);
56 stm32f2xx_timer_set_alarm(s, s->hit_time);
57 }
58
59 if (s->tim_ccmr1 & (TIM_CCMR1_OC2M2 | TIM_CCMR1_OC2M1) &&
60 !(s->tim_ccmr1 & TIM_CCMR1_OC2M0) &&
61 s->tim_ccmr1 & TIM_CCMR1_OC2PE &&
62 s->tim_ccer & TIM_CCER_CC2E) {
63
64 DB_PRINT("PWM2 Duty Cycle: %d%%\n",
65 s->tim_ccr2 / (100 * (s->tim_psc + 1)));
66 }
67}
68
69static inline int64_t stm32f2xx_ns_to_ticks(STM32F2XXTimerState *s, int64_t t)
70{
71 return muldiv64(t, s->freq_hz, 1000000000ULL) / (s->tim_psc + 1);
72}
73
74static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now)
75{
76 uint64_t ticks;
77 int64_t now_ticks;
78
79 if (s->tim_arr == 0) {
80 return;
81 }
82
83 DB_PRINT("Alarm set at: 0x%x\n", s->tim_cr1);
84
85 now_ticks = stm32f2xx_ns_to_ticks(s, now);
86 ticks = s->tim_arr - (now_ticks - s->tick_offset);
87
88 DB_PRINT("Alarm set in %d ticks\n", (int) ticks);
89
90 s->hit_time = muldiv64((ticks + (uint64_t) now_ticks) * (s->tim_psc + 1),
91 1000000000ULL, s->freq_hz);
92
93 timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->hit_time);
94 DB_PRINT("Wait Time: %" PRId64 " ticks\n", s->hit_time);
95}
96
97static void stm32f2xx_timer_reset(DeviceState *dev)
98{
99 STM32F2XXTimerState *s = STM32F2XXTIMER(dev);
100 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
101
102 s->tim_cr1 = 0;
103 s->tim_cr2 = 0;
104 s->tim_smcr = 0;
105 s->tim_dier = 0;
106 s->tim_sr = 0;
107 s->tim_egr = 0;
108 s->tim_ccmr1 = 0;
109 s->tim_ccmr2 = 0;
110 s->tim_ccer = 0;
111 s->tim_psc = 0;
112 s->tim_arr = 0;
113 s->tim_ccr1 = 0;
114 s->tim_ccr2 = 0;
115 s->tim_ccr3 = 0;
116 s->tim_ccr4 = 0;
117 s->tim_dcr = 0;
118 s->tim_dmar = 0;
119 s->tim_or = 0;
120
121 s->tick_offset = stm32f2xx_ns_to_ticks(s, now);
122}
123
124static uint64_t stm32f2xx_timer_read(void *opaque, hwaddr offset,
125 unsigned size)
126{
127 STM32F2XXTimerState *s = opaque;
128
129 DB_PRINT("Read 0x%"HWADDR_PRIx"\n", offset);
130
131 switch (offset) {
132 case TIM_CR1:
133 return s->tim_cr1;
134 case TIM_CR2:
135 return s->tim_cr2;
136 case TIM_SMCR:
137 return s->tim_smcr;
138 case TIM_DIER:
139 return s->tim_dier;
140 case TIM_SR:
141 return s->tim_sr;
142 case TIM_EGR:
143 return s->tim_egr;
144 case TIM_CCMR1:
145 return s->tim_ccmr1;
146 case TIM_CCMR2:
147 return s->tim_ccmr2;
148 case TIM_CCER:
149 return s->tim_ccer;
150 case TIM_CNT:
151 return stm32f2xx_ns_to_ticks(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) -
152 s->tick_offset;
153 case TIM_PSC:
154 return s->tim_psc;
155 case TIM_ARR:
156 return s->tim_arr;
157 case TIM_CCR1:
158 return s->tim_ccr1;
159 case TIM_CCR2:
160 return s->tim_ccr2;
161 case TIM_CCR3:
162 return s->tim_ccr3;
163 case TIM_CCR4:
164 return s->tim_ccr4;
165 case TIM_DCR:
166 return s->tim_dcr;
167 case TIM_DMAR:
168 return s->tim_dmar;
169 case TIM_OR:
170 return s->tim_or;
171 default:
172 qemu_log_mask(LOG_GUEST_ERROR,
173 "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
174 }
175
176 return 0;
177}
178
179static void stm32f2xx_timer_write(void *opaque, hwaddr offset,
180 uint64_t val64, unsigned size)
181{
182 STM32F2XXTimerState *s = opaque;
183 uint32_t value = val64;
184 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
185 uint32_t timer_val = 0;
186
187 DB_PRINT("Write 0x%x, 0x%"HWADDR_PRIx"\n", value, offset);
188
189 switch (offset) {
190 case TIM_CR1:
191 s->tim_cr1 = value;
192 return;
193 case TIM_CR2:
194 s->tim_cr2 = value;
195 return;
196 case TIM_SMCR:
197 s->tim_smcr = value;
198 return;
199 case TIM_DIER:
200 s->tim_dier = value;
201 return;
202 case TIM_SR:
203
204 s->tim_sr &= value;
205 return;
206 case TIM_EGR:
207 s->tim_egr = value;
208 if (s->tim_egr & TIM_EGR_UG) {
209 timer_val = 0;
210 break;
211 }
212 return;
213 case TIM_CCMR1:
214 s->tim_ccmr1 = value;
215 return;
216 case TIM_CCMR2:
217 s->tim_ccmr2 = value;
218 return;
219 case TIM_CCER:
220 s->tim_ccer = value;
221 return;
222 case TIM_PSC:
223 timer_val = stm32f2xx_ns_to_ticks(s, now) - s->tick_offset;
224 s->tim_psc = value & 0xFFFF;
225 break;
226 case TIM_CNT:
227 timer_val = value;
228 break;
229 case TIM_ARR:
230 s->tim_arr = value;
231 stm32f2xx_timer_set_alarm(s, now);
232 return;
233 case TIM_CCR1:
234 s->tim_ccr1 = value;
235 return;
236 case TIM_CCR2:
237 s->tim_ccr2 = value;
238 return;
239 case TIM_CCR3:
240 s->tim_ccr3 = value;
241 return;
242 case TIM_CCR4:
243 s->tim_ccr4 = value;
244 return;
245 case TIM_DCR:
246 s->tim_dcr = value;
247 return;
248 case TIM_DMAR:
249 s->tim_dmar = value;
250 return;
251 case TIM_OR:
252 s->tim_or = value;
253 return;
254 default:
255 qemu_log_mask(LOG_GUEST_ERROR,
256 "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
257 return;
258 }
259
260
261
262
263 s->tick_offset = stm32f2xx_ns_to_ticks(s, now) - timer_val;
264 stm32f2xx_timer_set_alarm(s, now);
265}
266
267static const MemoryRegionOps stm32f2xx_timer_ops = {
268 .read = stm32f2xx_timer_read,
269 .write = stm32f2xx_timer_write,
270 .endianness = DEVICE_NATIVE_ENDIAN,
271};
272
273static const VMStateDescription vmstate_stm32f2xx_timer = {
274 .name = TYPE_STM32F2XX_TIMER,
275 .version_id = 1,
276 .minimum_version_id = 1,
277 .fields = (VMStateField[]) {
278 VMSTATE_INT64(tick_offset, STM32F2XXTimerState),
279 VMSTATE_UINT32(tim_cr1, STM32F2XXTimerState),
280 VMSTATE_UINT32(tim_cr2, STM32F2XXTimerState),
281 VMSTATE_UINT32(tim_smcr, STM32F2XXTimerState),
282 VMSTATE_UINT32(tim_dier, STM32F2XXTimerState),
283 VMSTATE_UINT32(tim_sr, STM32F2XXTimerState),
284 VMSTATE_UINT32(tim_egr, STM32F2XXTimerState),
285 VMSTATE_UINT32(tim_ccmr1, STM32F2XXTimerState),
286 VMSTATE_UINT32(tim_ccmr2, STM32F2XXTimerState),
287 VMSTATE_UINT32(tim_ccer, STM32F2XXTimerState),
288 VMSTATE_UINT32(tim_psc, STM32F2XXTimerState),
289 VMSTATE_UINT32(tim_arr, STM32F2XXTimerState),
290 VMSTATE_UINT32(tim_ccr1, STM32F2XXTimerState),
291 VMSTATE_UINT32(tim_ccr2, STM32F2XXTimerState),
292 VMSTATE_UINT32(tim_ccr3, STM32F2XXTimerState),
293 VMSTATE_UINT32(tim_ccr4, STM32F2XXTimerState),
294 VMSTATE_UINT32(tim_dcr, STM32F2XXTimerState),
295 VMSTATE_UINT32(tim_dmar, STM32F2XXTimerState),
296 VMSTATE_UINT32(tim_or, STM32F2XXTimerState),
297 VMSTATE_END_OF_LIST()
298 }
299};
300
301static Property stm32f2xx_timer_properties[] = {
302 DEFINE_PROP_UINT64("clock-frequency", struct STM32F2XXTimerState,
303 freq_hz, 1000000000),
304 DEFINE_PROP_END_OF_LIST(),
305};
306
307static void stm32f2xx_timer_init(Object *obj)
308{
309 STM32F2XXTimerState *s = STM32F2XXTIMER(obj);
310
311 sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
312
313 memory_region_init_io(&s->iomem, obj, &stm32f2xx_timer_ops, s,
314 "stm32f2xx_timer", 0x400);
315 sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);
316}
317
318static void stm32f2xx_timer_realize(DeviceState *dev, Error **errp)
319{
320 STM32F2XXTimerState *s = STM32F2XXTIMER(dev);
321 s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, stm32f2xx_timer_interrupt, s);
322}
323
324static void stm32f2xx_timer_class_init(ObjectClass *klass, void *data)
325{
326 DeviceClass *dc = DEVICE_CLASS(klass);
327
328 dc->reset = stm32f2xx_timer_reset;
329 device_class_set_props(dc, stm32f2xx_timer_properties);
330 dc->vmsd = &vmstate_stm32f2xx_timer;
331 dc->realize = stm32f2xx_timer_realize;
332}
333
334static const TypeInfo stm32f2xx_timer_info = {
335 .name = TYPE_STM32F2XX_TIMER,
336 .parent = TYPE_SYS_BUS_DEVICE,
337 .instance_size = sizeof(STM32F2XXTimerState),
338 .instance_init = stm32f2xx_timer_init,
339 .class_init = stm32f2xx_timer_class_init,
340};
341
342static void stm32f2xx_timer_register_types(void)
343{
344 type_register_static(&stm32f2xx_timer_info);
345}
346
347type_init(stm32f2xx_timer_register_types)
348
