xen/pt: allow QEMU to request MSI unmasking at bind time
[qemu.git] / hw / timer / stm32f2xx_timer.c
1 /*
2 * STM32F2XX Timer
3 *
4 * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "hw/timer/stm32f2xx_timer.h"
27 #include "qemu/log.h"
28
29 #ifndef STM_TIMER_ERR_DEBUG
30 #define STM_TIMER_ERR_DEBUG 0
31 #endif
32
33 #define DB_PRINT_L(lvl, fmt, args...) do { \
34 if (STM_TIMER_ERR_DEBUG >= lvl) { \
35 qemu_log("%s: " fmt, __func__, ## args); \
36 } \
37 } while (0);
38
39 #define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)
40
41 static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now);
42
43 static void stm32f2xx_timer_interrupt(void *opaque)
44 {
45 STM32F2XXTimerState *s = opaque;
46
47 DB_PRINT("Interrupt\n");
48
49 if (s->tim_dier & TIM_DIER_UIE && s->tim_cr1 & TIM_CR1_CEN) {
50 s->tim_sr |= 1;
51 qemu_irq_pulse(s->irq);
52 stm32f2xx_timer_set_alarm(s, s->hit_time);
53 }
54
55 if (s->tim_ccmr1 & (TIM_CCMR1_OC2M2 | TIM_CCMR1_OC2M1) &&
56 !(s->tim_ccmr1 & TIM_CCMR1_OC2M0) &&
57 s->tim_ccmr1 & TIM_CCMR1_OC2PE &&
58 s->tim_ccer & TIM_CCER_CC2E) {
59 /* PWM 2 - Mode 1 */
60 DB_PRINT("PWM2 Duty Cycle: %d%%\n",
61 s->tim_ccr2 / (100 * (s->tim_psc + 1)));
62 }
63 }
64
65 static inline int64_t stm32f2xx_ns_to_ticks(STM32F2XXTimerState *s, int64_t t)
66 {
67 return muldiv64(t, s->freq_hz, 1000000000ULL) / (s->tim_psc + 1);
68 }
69
70 static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now)
71 {
72 uint64_t ticks;
73 int64_t now_ticks;
74
75 if (s->tim_arr == 0) {
76 return;
77 }
78
79 DB_PRINT("Alarm set at: 0x%x\n", s->tim_cr1);
80
81 now_ticks = stm32f2xx_ns_to_ticks(s, now);
82 ticks = s->tim_arr - (now_ticks - s->tick_offset);
83
84 DB_PRINT("Alarm set in %d ticks\n", (int) ticks);
85
86 s->hit_time = muldiv64((ticks + (uint64_t) now_ticks) * (s->tim_psc + 1),
87 1000000000ULL, s->freq_hz);
88
89 timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->hit_time);
90 DB_PRINT("Wait Time: %" PRId64 " ticks\n", s->hit_time);
91 }
92
93 static void stm32f2xx_timer_reset(DeviceState *dev)
94 {
95 STM32F2XXTimerState *s = STM32F2XXTIMER(dev);
96 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
97
98 s->tim_cr1 = 0;
99 s->tim_cr2 = 0;
100 s->tim_smcr = 0;
101 s->tim_dier = 0;
102 s->tim_sr = 0;
103 s->tim_egr = 0;
104 s->tim_ccmr1 = 0;
105 s->tim_ccmr2 = 0;
106 s->tim_ccer = 0;
107 s->tim_psc = 0;
108 s->tim_arr = 0;
109 s->tim_ccr1 = 0;
110 s->tim_ccr2 = 0;
111 s->tim_ccr3 = 0;
112 s->tim_ccr4 = 0;
113 s->tim_dcr = 0;
114 s->tim_dmar = 0;
115 s->tim_or = 0;
116
117 s->tick_offset = stm32f2xx_ns_to_ticks(s, now);
118 }
119
120 static uint64_t stm32f2xx_timer_read(void *opaque, hwaddr offset,
121 unsigned size)
122 {
123 STM32F2XXTimerState *s = opaque;
124
125 DB_PRINT("Read 0x%"HWADDR_PRIx"\n", offset);
126
127 switch (offset) {
128 case TIM_CR1:
129 return s->tim_cr1;
130 case TIM_CR2:
131 return s->tim_cr2;
132 case TIM_SMCR:
133 return s->tim_smcr;
134 case TIM_DIER:
135 return s->tim_dier;
136 case TIM_SR:
137 return s->tim_sr;
138 case TIM_EGR:
139 return s->tim_egr;
140 case TIM_CCMR1:
141 return s->tim_ccmr1;
142 case TIM_CCMR2:
143 return s->tim_ccmr2;
144 case TIM_CCER:
145 return s->tim_ccer;
146 case TIM_CNT:
147 return stm32f2xx_ns_to_ticks(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) -
148 s->tick_offset;
149 case TIM_PSC:
150 return s->tim_psc;
151 case TIM_ARR:
152 return s->tim_arr;
153 case TIM_CCR1:
154 return s->tim_ccr1;
155 case TIM_CCR2:
156 return s->tim_ccr2;
157 case TIM_CCR3:
158 return s->tim_ccr3;
159 case TIM_CCR4:
160 return s->tim_ccr4;
161 case TIM_DCR:
162 return s->tim_dcr;
163 case TIM_DMAR:
164 return s->tim_dmar;
165 case TIM_OR:
166 return s->tim_or;
167 default:
168 qemu_log_mask(LOG_GUEST_ERROR,
169 "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
170 }
171
172 return 0;
173 }
174
175 static void stm32f2xx_timer_write(void *opaque, hwaddr offset,
176 uint64_t val64, unsigned size)
177 {
178 STM32F2XXTimerState *s = opaque;
179 uint32_t value = val64;
180 int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
181 uint32_t timer_val = 0;
182
183 DB_PRINT("Write 0x%x, 0x%"HWADDR_PRIx"\n", value, offset);
184
185 switch (offset) {
186 case TIM_CR1:
187 s->tim_cr1 = value;
188 return;
189 case TIM_CR2:
190 s->tim_cr2 = value;
191 return;
192 case TIM_SMCR:
193 s->tim_smcr = value;
194 return;
195 case TIM_DIER:
196 s->tim_dier = value;
197 return;
198 case TIM_SR:
199 /* This is set by hardware and cleared by software */
200 s->tim_sr &= value;
201 return;
202 case TIM_EGR:
203 s->tim_egr = value;
204 if (s->tim_egr & TIM_EGR_UG) {
205 timer_val = 0;
206 break;
207 }
208 return;
209 case TIM_CCMR1:
210 s->tim_ccmr1 = value;
211 return;
212 case TIM_CCMR2:
213 s->tim_ccmr2 = value;
214 return;
215 case TIM_CCER:
216 s->tim_ccer = value;
217 return;
218 case TIM_PSC:
219 timer_val = stm32f2xx_ns_to_ticks(s, now) - s->tick_offset;
220 s->tim_psc = value & 0xFFFF;
221 value = timer_val;
222 break;
223 case TIM_CNT:
224 timer_val = value;
225 break;
226 case TIM_ARR:
227 s->tim_arr = value;
228 stm32f2xx_timer_set_alarm(s, now);
229 return;
230 case TIM_CCR1:
231 s->tim_ccr1 = value;
232 return;
233 case TIM_CCR2:
234 s->tim_ccr2 = value;
235 return;
236 case TIM_CCR3:
237 s->tim_ccr3 = value;
238 return;
239 case TIM_CCR4:
240 s->tim_ccr4 = value;
241 return;
242 case TIM_DCR:
243 s->tim_dcr = value;
244 return;
245 case TIM_DMAR:
246 s->tim_dmar = value;
247 return;
248 case TIM_OR:
249 s->tim_or = value;
250 return;
251 default:
252 qemu_log_mask(LOG_GUEST_ERROR,
253 "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
254 return;
255 }
256
257 /* This means that a register write has affected the timer in a way that
258 * requires a refresh of both tick_offset and the alarm.
259 */
260 s->tick_offset = stm32f2xx_ns_to_ticks(s, now) - timer_val;
261 stm32f2xx_timer_set_alarm(s, now);
262 }
263
264 static const MemoryRegionOps stm32f2xx_timer_ops = {
265 .read = stm32f2xx_timer_read,
266 .write = stm32f2xx_timer_write,
267 .endianness = DEVICE_NATIVE_ENDIAN,
268 };
269
270 static const VMStateDescription vmstate_stm32f2xx_timer = {
271 .name = TYPE_STM32F2XX_TIMER,
272 .version_id = 1,
273 .minimum_version_id = 1,
274 .fields = (VMStateField[]) {
275 VMSTATE_INT64(tick_offset, STM32F2XXTimerState),
276 VMSTATE_UINT32(tim_cr1, STM32F2XXTimerState),
277 VMSTATE_UINT32(tim_cr2, STM32F2XXTimerState),
278 VMSTATE_UINT32(tim_smcr, STM32F2XXTimerState),
279 VMSTATE_UINT32(tim_dier, STM32F2XXTimerState),
280 VMSTATE_UINT32(tim_sr, STM32F2XXTimerState),
281 VMSTATE_UINT32(tim_egr, STM32F2XXTimerState),
282 VMSTATE_UINT32(tim_ccmr1, STM32F2XXTimerState),
283 VMSTATE_UINT32(tim_ccmr2, STM32F2XXTimerState),
284 VMSTATE_UINT32(tim_ccer, STM32F2XXTimerState),
285 VMSTATE_UINT32(tim_psc, STM32F2XXTimerState),
286 VMSTATE_UINT32(tim_arr, STM32F2XXTimerState),
287 VMSTATE_UINT32(tim_ccr1, STM32F2XXTimerState),
288 VMSTATE_UINT32(tim_ccr2, STM32F2XXTimerState),
289 VMSTATE_UINT32(tim_ccr3, STM32F2XXTimerState),
290 VMSTATE_UINT32(tim_ccr4, STM32F2XXTimerState),
291 VMSTATE_UINT32(tim_dcr, STM32F2XXTimerState),
292 VMSTATE_UINT32(tim_dmar, STM32F2XXTimerState),
293 VMSTATE_UINT32(tim_or, STM32F2XXTimerState),
294 VMSTATE_END_OF_LIST()
295 }
296 };
297
298 static Property stm32f2xx_timer_properties[] = {
299 DEFINE_PROP_UINT64("clock-frequency", struct STM32F2XXTimerState,
300 freq_hz, 1000000000),
301 DEFINE_PROP_END_OF_LIST(),
302 };
303
304 static void stm32f2xx_timer_init(Object *obj)
305 {
306 STM32F2XXTimerState *s = STM32F2XXTIMER(obj);
307
308 sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);
309
310 memory_region_init_io(&s->iomem, obj, &stm32f2xx_timer_ops, s,
311 "stm32f2xx_timer", 0x4000);
312 sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);
313
314 s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, stm32f2xx_timer_interrupt, s);
315 }
316
317 static void stm32f2xx_timer_class_init(ObjectClass *klass, void *data)
318 {
319 DeviceClass *dc = DEVICE_CLASS(klass);
320
321 dc->reset = stm32f2xx_timer_reset;
322 dc->props = stm32f2xx_timer_properties;
323 dc->vmsd = &vmstate_stm32f2xx_timer;
324 }
325
326 static const TypeInfo stm32f2xx_timer_info = {
327 .name = TYPE_STM32F2XX_TIMER,
328 .parent = TYPE_SYS_BUS_DEVICE,
329 .instance_size = sizeof(STM32F2XXTimerState),
330 .instance_init = stm32f2xx_timer_init,
331 .class_init = stm32f2xx_timer_class_init,
332 };
333
334 static void stm32f2xx_timer_register_types(void)
335 {
336 type_register_static(&stm32f2xx_timer_info);
337 }
338
339 type_init(stm32f2xx_timer_register_types)