hw/timer/stm32f2xx_timer.c - qemu - Git at Google

 /*
  * STM32F2XX Timer
  *
  * Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 #include "qemu/osdep.h"
 #include "hw/timer/stm32f2xx_timer.h"
 #include "qemu/log.h"

 #ifndef STM_TIMER_ERR_DEBUG
 #define STM_TIMER_ERR_DEBUG 0
 #endif

 #define DB_PRINT_L(lvl, fmt, args...) do { \
     if (STM_TIMER_ERR_DEBUG >= lvl) { \
         qemu_log("%s: " fmt, __func__, ## args); \
     } \
 } while (0);

 #define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)

 static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now);

 static void stm32f2xx_timer_interrupt(void *opaque)
 {
     STM32F2XXTimerState *s = opaque;

     DB_PRINT("Interrupt\n");

     if (s->tim_dier & TIM_DIER_UIE && s->tim_cr1 & TIM_CR1_CEN) {
         s->tim_sr |= 1;
         qemu_irq_pulse(s->irq);
         stm32f2xx_timer_set_alarm(s, s->hit_time);
     }

     if (s->tim_ccmr1 & (TIM_CCMR1_OC2M2 | TIM_CCMR1_OC2M1) &&
         !(s->tim_ccmr1 & TIM_CCMR1_OC2M0) &&
         s->tim_ccmr1 & TIM_CCMR1_OC2PE &&
         s->tim_ccer & TIM_CCER_CC2E) {
         /* PWM 2 - Mode 1 */
         DB_PRINT("PWM2 Duty Cycle: %d%%\n",
                 s->tim_ccr2 / (100 * (s->tim_psc + 1)));
     }
 }

 static inline int64_t stm32f2xx_ns_to_ticks(STM32F2XXTimerState *s, int64_t t)
 {
     return muldiv64(t, s->freq_hz, 1000000000ULL) / (s->tim_psc + 1);
 }

 static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now)
 {
     uint64_t ticks;
     int64_t now_ticks;

     if (s->tim_arr == 0) {
         return;
     }

     DB_PRINT("Alarm set at: 0x%x\n", s->tim_cr1);

     now_ticks = stm32f2xx_ns_to_ticks(s, now);
     ticks = s->tim_arr - (now_ticks - s->tick_offset);

     DB_PRINT("Alarm set in %d ticks\n", (int) ticks);

     s->hit_time = muldiv64((ticks + (uint64_t) now_ticks) * (s->tim_psc + 1),
                                1000000000ULL, s->freq_hz);

     timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->hit_time);
     DB_PRINT("Wait Time: %" PRId64 " ticks\n", s->hit_time);
 }

 static void stm32f2xx_timer_reset(DeviceState *dev)
 {
     STM32F2XXTimerState *s = STM32F2XXTIMER(dev);
     int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);

     s->tim_cr1 = 0;
     s->tim_cr2 = 0;
     s->tim_smcr = 0;
     s->tim_dier = 0;
     s->tim_sr = 0;
     s->tim_egr = 0;
     s->tim_ccmr1 = 0;
     s->tim_ccmr2 = 0;
     s->tim_ccer = 0;
     s->tim_psc = 0;
     s->tim_arr = 0;
     s->tim_ccr1 = 0;
     s->tim_ccr2 = 0;
     s->tim_ccr3 = 0;
     s->tim_ccr4 = 0;
     s->tim_dcr = 0;
     s->tim_dmar = 0;
     s->tim_or = 0;

     s->tick_offset = stm32f2xx_ns_to_ticks(s, now);
 }

 static uint64_t stm32f2xx_timer_read(void *opaque, hwaddr offset,
                            unsigned size)
 {
     STM32F2XXTimerState *s = opaque;

     DB_PRINT("Read 0x%"HWADDR_PRIx"\n", offset);

     switch (offset) {
     case TIM_CR1:
         return s->tim_cr1;
     case TIM_CR2:
         return s->tim_cr2;
     case TIM_SMCR:
         return s->tim_smcr;
     case TIM_DIER:
         return s->tim_dier;
     case TIM_SR:
         return s->tim_sr;
     case TIM_EGR:
         return s->tim_egr;
     case TIM_CCMR1:
         return s->tim_ccmr1;
     case TIM_CCMR2:
         return s->tim_ccmr2;
     case TIM_CCER:
         return s->tim_ccer;
     case TIM_CNT:
         return stm32f2xx_ns_to_ticks(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) -
                s->tick_offset;
     case TIM_PSC:
         return s->tim_psc;
     case TIM_ARR:
         return s->tim_arr;
     case TIM_CCR1:
         return s->tim_ccr1;
     case TIM_CCR2:
         return s->tim_ccr2;
     case TIM_CCR3:
         return s->tim_ccr3;
     case TIM_CCR4:
         return s->tim_ccr4;
     case TIM_DCR:
         return s->tim_dcr;
     case TIM_DMAR:
         return s->tim_dmar;
     case TIM_OR:
         return s->tim_or;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
     }

     return 0;
 }

 static void stm32f2xx_timer_write(void *opaque, hwaddr offset,
                         uint64_t val64, unsigned size)
 {
     STM32F2XXTimerState *s = opaque;
     uint32_t value = val64;
     int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
     uint32_t timer_val = 0;

     DB_PRINT("Write 0x%x, 0x%"HWADDR_PRIx"\n", value, offset);

     switch (offset) {
     case TIM_CR1:
         s->tim_cr1 = value;
         return;
     case TIM_CR2:
         s->tim_cr2 = value;
         return;
     case TIM_SMCR:
         s->tim_smcr = value;
         return;
     case TIM_DIER:
         s->tim_dier = value;
         return;
     case TIM_SR:
         /* This is set by hardware and cleared by software */
         s->tim_sr &= value;
         return;
     case TIM_EGR:
         s->tim_egr = value;
         if (s->tim_egr & TIM_EGR_UG) {
             timer_val = 0;
             break;
         }
         return;
     case TIM_CCMR1:
         s->tim_ccmr1 = value;
         return;
     case TIM_CCMR2:
         s->tim_ccmr2 = value;
         return;
     case TIM_CCER:
         s->tim_ccer = value;
         return;
     case TIM_PSC:
         timer_val = stm32f2xx_ns_to_ticks(s, now) - s->tick_offset;
         s->tim_psc = value & 0xFFFF;
         value = timer_val;
         break;
     case TIM_CNT:
         timer_val = value;
         break;
     case TIM_ARR:
         s->tim_arr = value;
         stm32f2xx_timer_set_alarm(s, now);
         return;
     case TIM_CCR1:
         s->tim_ccr1 = value;
         return;
     case TIM_CCR2:
         s->tim_ccr2 = value;
         return;
     case TIM_CCR3:
         s->tim_ccr3 = value;
         return;
     case TIM_CCR4:
         s->tim_ccr4 = value;
         return;
     case TIM_DCR:
         s->tim_dcr = value;
         return;
     case TIM_DMAR:
         s->tim_dmar = value;
         return;
     case TIM_OR:
         s->tim_or = value;
         return;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
         return;
     }

     /* This means that a register write has affected the timer in a way that
      * requires a refresh of both tick_offset and the alarm.
      */
     s->tick_offset = stm32f2xx_ns_to_ticks(s, now) - timer_val;
     stm32f2xx_timer_set_alarm(s, now);
 }

 static const MemoryRegionOps stm32f2xx_timer_ops = {
     .read = stm32f2xx_timer_read,
     .write = stm32f2xx_timer_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
 };

 static const VMStateDescription vmstate_stm32f2xx_timer = {
     .name = TYPE_STM32F2XX_TIMER,
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_INT64(tick_offset, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_cr1, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_cr2, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_smcr, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_dier, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_sr, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_egr, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_ccmr1, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_ccmr2, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_ccer, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_psc, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_arr, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_ccr1, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_ccr2, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_ccr3, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_ccr4, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_dcr, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_dmar, STM32F2XXTimerState),
         VMSTATE_UINT32(tim_or, STM32F2XXTimerState),
         VMSTATE_END_OF_LIST()
     }
 };

 static Property stm32f2xx_timer_properties[] = {
     DEFINE_PROP_UINT64("clock-frequency", struct STM32F2XXTimerState,
                        freq_hz, 1000000000),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void stm32f2xx_timer_init(Object *obj)
 {
     STM32F2XXTimerState *s = STM32F2XXTIMER(obj);

     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);

     memory_region_init_io(&s->iomem, obj, &stm32f2xx_timer_ops, s,
                           "stm32f2xx_timer", 0x4000);
     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);

     s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, stm32f2xx_timer_interrupt, s);
 }

 static void stm32f2xx_timer_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     dc->reset = stm32f2xx_timer_reset;
     dc->props = stm32f2xx_timer_properties;
     dc->vmsd = &vmstate_stm32f2xx_timer;
 }

 static const TypeInfo stm32f2xx_timer_info = {
     .name          = TYPE_STM32F2XX_TIMER,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(STM32F2XXTimerState),
     .instance_init = stm32f2xx_timer_init,
     .class_init    = stm32f2xx_timer_class_init,
 };

 static void stm32f2xx_timer_register_types(void)
 {
     type_register_static(&stm32f2xx_timer_info);
 }

 type_init(stm32f2xx_timer_register_types)
	/*
	* STM32F2XX Timer
	*
	* Copyright (c) 2014 Alistair Francis <alistair@alistair23.me>
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/

	#include "qemu/osdep.h"
	#include "hw/timer/stm32f2xx_timer.h"
	#include "qemu/log.h"

	#ifndef STM_TIMER_ERR_DEBUG
	#define STM_TIMER_ERR_DEBUG 0
	#endif

	#define DB_PRINT_L(lvl, fmt, args...) do { \
	if (STM_TIMER_ERR_DEBUG >= lvl) { \
	qemu_log("%s: " fmt, __func__, ## args); \
	} \
	} while (0);

	#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)

	static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now);

	static void stm32f2xx_timer_interrupt(void *opaque)
	{
	STM32F2XXTimerState *s = opaque;

	DB_PRINT("Interrupt\n");

	if (s->tim_dier & TIM_DIER_UIE && s->tim_cr1 & TIM_CR1_CEN) {
	s->tim_sr \|= 1;
	qemu_irq_pulse(s->irq);
	stm32f2xx_timer_set_alarm(s, s->hit_time);
	}

	if (s->tim_ccmr1 & (TIM_CCMR1_OC2M2 \| TIM_CCMR1_OC2M1) &&
	!(s->tim_ccmr1 & TIM_CCMR1_OC2M0) &&
	s->tim_ccmr1 & TIM_CCMR1_OC2PE &&
	s->tim_ccer & TIM_CCER_CC2E) {
	/* PWM 2 - Mode 1 */
	DB_PRINT("PWM2 Duty Cycle: %d%%\n",
	s->tim_ccr2 / (100 * (s->tim_psc + 1)));
	}
	}

	static inline int64_t stm32f2xx_ns_to_ticks(STM32F2XXTimerState *s, int64_t t)
	{
	return muldiv64(t, s->freq_hz, 1000000000ULL) / (s->tim_psc + 1);
	}

	static void stm32f2xx_timer_set_alarm(STM32F2XXTimerState *s, int64_t now)
	{
	uint64_t ticks;
	int64_t now_ticks;

	if (s->tim_arr == 0) {
	return;
	}

	DB_PRINT("Alarm set at: 0x%x\n", s->tim_cr1);

	now_ticks = stm32f2xx_ns_to_ticks(s, now);
	ticks = s->tim_arr - (now_ticks - s->tick_offset);

	DB_PRINT("Alarm set in %d ticks\n", (int) ticks);

	s->hit_time = muldiv64((ticks + (uint64_t) now_ticks) * (s->tim_psc + 1),
	1000000000ULL, s->freq_hz);

	timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->hit_time);
	DB_PRINT("Wait Time: %" PRId64 " ticks\n", s->hit_time);
	}

	static void stm32f2xx_timer_reset(DeviceState *dev)
	{
	STM32F2XXTimerState *s = STM32F2XXTIMER(dev);
	int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);

	s->tim_cr1 = 0;
	s->tim_cr2 = 0;
	s->tim_smcr = 0;
	s->tim_dier = 0;
	s->tim_sr = 0;
	s->tim_egr = 0;
	s->tim_ccmr1 = 0;
	s->tim_ccmr2 = 0;
	s->tim_ccer = 0;
	s->tim_psc = 0;
	s->tim_arr = 0;
	s->tim_ccr1 = 0;
	s->tim_ccr2 = 0;
	s->tim_ccr3 = 0;
	s->tim_ccr4 = 0;
	s->tim_dcr = 0;
	s->tim_dmar = 0;
	s->tim_or = 0;

	s->tick_offset = stm32f2xx_ns_to_ticks(s, now);
	}

	static uint64_t stm32f2xx_timer_read(void *opaque, hwaddr offset,
	unsigned size)
	{
	STM32F2XXTimerState *s = opaque;

	DB_PRINT("Read 0x%"HWADDR_PRIx"\n", offset);

	switch (offset) {
	case TIM_CR1:
	return s->tim_cr1;
	case TIM_CR2:
	return s->tim_cr2;
	case TIM_SMCR:
	return s->tim_smcr;
	case TIM_DIER:
	return s->tim_dier;
	case TIM_SR:
	return s->tim_sr;
	case TIM_EGR:
	return s->tim_egr;
	case TIM_CCMR1:
	return s->tim_ccmr1;
	case TIM_CCMR2:
	return s->tim_ccmr2;
	case TIM_CCER:
	return s->tim_ccer;
	case TIM_CNT:
	return stm32f2xx_ns_to_ticks(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) -
	s->tick_offset;
	case TIM_PSC:
	return s->tim_psc;
	case TIM_ARR:
	return s->tim_arr;
	case TIM_CCR1:
	return s->tim_ccr1;
	case TIM_CCR2:
	return s->tim_ccr2;
	case TIM_CCR3:
	return s->tim_ccr3;
	case TIM_CCR4:
	return s->tim_ccr4;
	case TIM_DCR:
	return s->tim_dcr;
	case TIM_DMAR:
	return s->tim_dmar;
	case TIM_OR:
	return s->tim_or;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
	}

	return 0;
	}

	static void stm32f2xx_timer_write(void *opaque, hwaddr offset,
	uint64_t val64, unsigned size)
	{
	STM32F2XXTimerState *s = opaque;
	uint32_t value = val64;
	int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
	uint32_t timer_val = 0;

	DB_PRINT("Write 0x%x, 0x%"HWADDR_PRIx"\n", value, offset);

	switch (offset) {
	case TIM_CR1:
	s->tim_cr1 = value;
	return;
	case TIM_CR2:
	s->tim_cr2 = value;
	return;
	case TIM_SMCR:
	s->tim_smcr = value;
	return;
	case TIM_DIER:
	s->tim_dier = value;
	return;
	case TIM_SR:
	/* This is set by hardware and cleared by software */
	s->tim_sr &= value;
	return;
	case TIM_EGR:
	s->tim_egr = value;
	if (s->tim_egr & TIM_EGR_UG) {
	timer_val = 0;
	break;
	}
	return;
	case TIM_CCMR1:
	s->tim_ccmr1 = value;
	return;
	case TIM_CCMR2:
	s->tim_ccmr2 = value;
	return;
	case TIM_CCER:
	s->tim_ccer = value;
	return;
	case TIM_PSC:
	timer_val = stm32f2xx_ns_to_ticks(s, now) - s->tick_offset;
	s->tim_psc = value & 0xFFFF;
	value = timer_val;
	break;
	case TIM_CNT:
	timer_val = value;
	break;
	case TIM_ARR:
	s->tim_arr = value;
	stm32f2xx_timer_set_alarm(s, now);
	return;
	case TIM_CCR1:
	s->tim_ccr1 = value;
	return;
	case TIM_CCR2:
	s->tim_ccr2 = value;
	return;
	case TIM_CCR3:
	s->tim_ccr3 = value;
	return;
	case TIM_CCR4:
	s->tim_ccr4 = value;
	return;
	case TIM_DCR:
	s->tim_dcr = value;
	return;
	case TIM_DMAR:
	s->tim_dmar = value;
	return;
	case TIM_OR:
	s->tim_or = value;
	return;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, offset);
	return;
	}

	/* This means that a register write has affected the timer in a way that
	* requires a refresh of both tick_offset and the alarm.
	*/
	s->tick_offset = stm32f2xx_ns_to_ticks(s, now) - timer_val;
	stm32f2xx_timer_set_alarm(s, now);
	}

	static const MemoryRegionOps stm32f2xx_timer_ops = {
	.read = stm32f2xx_timer_read,
	.write = stm32f2xx_timer_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	};

	static const VMStateDescription vmstate_stm32f2xx_timer = {
	.name = TYPE_STM32F2XX_TIMER,
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_INT64(tick_offset, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_cr1, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_cr2, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_smcr, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_dier, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_sr, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_egr, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_ccmr1, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_ccmr2, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_ccer, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_psc, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_arr, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_ccr1, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_ccr2, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_ccr3, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_ccr4, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_dcr, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_dmar, STM32F2XXTimerState),
	VMSTATE_UINT32(tim_or, STM32F2XXTimerState),
	VMSTATE_END_OF_LIST()
	}
	};

	static Property stm32f2xx_timer_properties[] = {
	DEFINE_PROP_UINT64("clock-frequency", struct STM32F2XXTimerState,
	freq_hz, 1000000000),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void stm32f2xx_timer_init(Object *obj)
	{
	STM32F2XXTimerState *s = STM32F2XXTIMER(obj);

	sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->irq);

	memory_region_init_io(&s->iomem, obj, &stm32f2xx_timer_ops, s,
	"stm32f2xx_timer", 0x4000);
	sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->iomem);

	s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, stm32f2xx_timer_interrupt, s);
	}

	static void stm32f2xx_timer_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	dc->reset = stm32f2xx_timer_reset;
	dc->props = stm32f2xx_timer_properties;
	dc->vmsd = &vmstate_stm32f2xx_timer;
	}

	static const TypeInfo stm32f2xx_timer_info = {
	.name = TYPE_STM32F2XX_TIMER,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(STM32F2XXTimerState),
	.instance_init = stm32f2xx_timer_init,
	.class_init = stm32f2xx_timer_class_init,
	};

	static void stm32f2xx_timer_register_types(void)
	{
	type_register_static(&stm32f2xx_timer_info);
	}

	type_init(stm32f2xx_timer_register_types)