hw/timer/stellaris-gptm.c - qemu - Git at Google

 /*
  * Luminary Micro Stellaris General Purpose Timer Module
  *
  * Copyright (c) 2006 CodeSourcery.
  * Written by Paul Brook
  *
  * This code is licensed under the GPL.
  */

 #include "qemu/osdep.h"
 #include "qemu/log.h"
 #include "qemu/timer.h"
 #include "qapi/error.h"
 #include "migration/vmstate.h"
 #include "hw/qdev-clock.h"
 #include "hw/timer/stellaris-gptm.h"

 static void gptm_update_irq(gptm_state *s)
 {
     int level;
     level = (s->state & s->mask) != 0;
     qemu_set_irq(s->irq, level);
 }

 static void gptm_stop(gptm_state *s, int n)
 {
     timer_del(s->timer[n]);
 }

 static void gptm_reload(gptm_state *s, int n, int reset)
 {
     int64_t tick;
     if (reset) {
         tick = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
     } else {
         tick = s->tick[n];
     }

     if (s->config == 0) {
         /* 32-bit CountDown.  */
         uint32_t count;
         count = s->load[0] | (s->load[1] << 16);
         tick += clock_ticks_to_ns(s->clk, count);
     } else if (s->config == 1) {
         /* 32-bit RTC.  1Hz tick.  */
         tick += NANOSECONDS_PER_SECOND;
     } else if (s->mode[n] == 0xa) {
         /* PWM mode.  Not implemented.  */
     } else {
         qemu_log_mask(LOG_UNIMP,
                       "GPTM: 16-bit timer mode unimplemented: 0x%x\n",
                       s->mode[n]);
         return;
     }
     s->tick[n] = tick;
     timer_mod(s->timer[n], tick);
 }

 static void gptm_tick(void *opaque)
 {
     gptm_state **p = (gptm_state **)opaque;
     gptm_state *s;
     int n;

     s = *p;
     n = p - s->opaque;
     if (s->config == 0) {
         s->state |= 1;
         if ((s->control & 0x20)) {
             /* Output trigger.  */
             qemu_irq_pulse(s->trigger);
         }
         if (s->mode[0] & 1) {
             /* One-shot.  */
             s->control &= ~1;
         } else {
             /* Periodic.  */
             gptm_reload(s, 0, 0);
         }
     } else if (s->config == 1) {
         /* RTC.  */
         uint32_t match;
         s->rtc++;
         match = s->match[0] | (s->match[1] << 16);
         if (s->rtc > match)
             s->rtc = 0;
         if (s->rtc == 0) {
             s->state |= 8;
         }
         gptm_reload(s, 0, 0);
     } else if (s->mode[n] == 0xa) {
         /* PWM mode.  Not implemented.  */
     } else {
         qemu_log_mask(LOG_UNIMP,
                       "GPTM: 16-bit timer mode unimplemented: 0x%x\n",
                       s->mode[n]);
     }
     gptm_update_irq(s);
 }

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

     switch (offset) {
     case 0x00: /* CFG */
         return s->config;
     case 0x04: /* TAMR */
         return s->mode[0];
     case 0x08: /* TBMR */
         return s->mode[1];
     case 0x0c: /* CTL */
         return s->control;
     case 0x18: /* IMR */
         return s->mask;
     case 0x1c: /* RIS */
         return s->state;
     case 0x20: /* MIS */
         return s->state & s->mask;
     case 0x24: /* CR */
         return 0;
     case 0x28: /* TAILR */
         return s->load[0] | ((s->config < 4) ? (s->load[1] << 16) : 0);
     case 0x2c: /* TBILR */
         return s->load[1];
     case 0x30: /* TAMARCHR */
         return s->match[0] | ((s->config < 4) ? (s->match[1] << 16) : 0);
     case 0x34: /* TBMATCHR */
         return s->match[1];
     case 0x38: /* TAPR */
         return s->prescale[0];
     case 0x3c: /* TBPR */
         return s->prescale[1];
     case 0x40: /* TAPMR */
         return s->match_prescale[0];
     case 0x44: /* TBPMR */
         return s->match_prescale[1];
     case 0x48: /* TAR */
         if (s->config == 1) {
             return s->rtc;
         }
         qemu_log_mask(LOG_UNIMP,
                       "GPTM: read of TAR but timer read not supported\n");
         return 0;
     case 0x4c: /* TBR */
         qemu_log_mask(LOG_UNIMP,
                       "GPTM: read of TBR but timer read not supported\n");
         return 0;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "GPTM: read at bad offset 0x02%" HWADDR_PRIx "\n",
                       offset);
         return 0;
     }
 }

 static void gptm_write(void *opaque, hwaddr offset,
                        uint64_t value, unsigned size)
 {
     gptm_state *s = (gptm_state *)opaque;
     uint32_t oldval;

     /*
      * The timers should be disabled before changing the configuration.
      * We take advantage of this and defer everything until the timer
      * is enabled.
      */
     switch (offset) {
     case 0x00: /* CFG */
         s->config = value;
         break;
     case 0x04: /* TAMR */
         s->mode[0] = value;
         break;
     case 0x08: /* TBMR */
         s->mode[1] = value;
         break;
     case 0x0c: /* CTL */
         oldval = s->control;
         s->control = value;
         /* TODO: Implement pause.  */
         if ((oldval ^ value) & 1) {
             if (value & 1) {
                 gptm_reload(s, 0, 1);
             } else {
                 gptm_stop(s, 0);
             }
         }
         if (((oldval ^ value) & 0x100) && s->config >= 4) {
             if (value & 0x100) {
                 gptm_reload(s, 1, 1);
             } else {
                 gptm_stop(s, 1);
             }
         }
         break;
     case 0x18: /* IMR */
         s->mask = value & 0x77;
         gptm_update_irq(s);
         break;
     case 0x24: /* CR */
         s->state &= ~value;
         break;
     case 0x28: /* TAILR */
         s->load[0] = value & 0xffff;
         if (s->config < 4) {
             s->load[1] = value >> 16;
         }
         break;
     case 0x2c: /* TBILR */
         s->load[1] = value & 0xffff;
         break;
     case 0x30: /* TAMARCHR */
         s->match[0] = value & 0xffff;
         if (s->config < 4) {
             s->match[1] = value >> 16;
         }
         break;
     case 0x34: /* TBMATCHR */
         s->match[1] = value >> 16;
         break;
     case 0x38: /* TAPR */
         s->prescale[0] = value;
         break;
     case 0x3c: /* TBPR */
         s->prescale[1] = value;
         break;
     case 0x40: /* TAPMR */
         s->match_prescale[0] = value;
         break;
     case 0x44: /* TBPMR */
         s->match_prescale[0] = value;
         break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "GPTM: write at bad offset 0x02%" HWADDR_PRIx "\n",
                       offset);
     }
     gptm_update_irq(s);
 }

 static const MemoryRegionOps gptm_ops = {
     .read = gptm_read,
     .write = gptm_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
 };

 static const VMStateDescription vmstate_stellaris_gptm = {
     .name = "stellaris_gptm",
     .version_id = 2,
     .minimum_version_id = 2,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(config, gptm_state),
         VMSTATE_UINT32_ARRAY(mode, gptm_state, 2),
         VMSTATE_UINT32(control, gptm_state),
         VMSTATE_UINT32(state, gptm_state),
         VMSTATE_UINT32(mask, gptm_state),
         VMSTATE_UNUSED(8),
         VMSTATE_UINT32_ARRAY(load, gptm_state, 2),
         VMSTATE_UINT32_ARRAY(match, gptm_state, 2),
         VMSTATE_UINT32_ARRAY(prescale, gptm_state, 2),
         VMSTATE_UINT32_ARRAY(match_prescale, gptm_state, 2),
         VMSTATE_UINT32(rtc, gptm_state),
         VMSTATE_INT64_ARRAY(tick, gptm_state, 2),
         VMSTATE_TIMER_PTR_ARRAY(timer, gptm_state, 2),
         VMSTATE_CLOCK(clk, gptm_state),
         VMSTATE_END_OF_LIST()
     }
 };

 static void stellaris_gptm_init(Object *obj)
 {
     DeviceState *dev = DEVICE(obj);
     gptm_state *s = STELLARIS_GPTM(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

     sysbus_init_irq(sbd, &s->irq);
     qdev_init_gpio_out(dev, &s->trigger, 1);

     memory_region_init_io(&s->iomem, obj, &gptm_ops, s,
                           "gptm", 0x1000);
     sysbus_init_mmio(sbd, &s->iomem);

     s->opaque[0] = s->opaque[1] = s;

     /*
      * TODO: in an ideal world we would model the effects of changing
      * the input clock frequency while the countdown timer is active.
      * The best way to do this would be to convert the device to use
      * ptimer instead of hand-rolling its own timer. This would also
      * make it easy to implement reading the current count from the
      * TAR and TBR registers.
      */
     s->clk = qdev_init_clock_in(dev, "clk", NULL, NULL, 0);
 }

 static void stellaris_gptm_realize(DeviceState *dev, Error **errp)
 {
     gptm_state *s = STELLARIS_GPTM(dev);

     if (!clock_has_source(s->clk)) {
         error_setg(errp, "stellaris-gptm: clk must be connected");
         return;
     }

     s->timer[0] = timer_new_ns(QEMU_CLOCK_VIRTUAL, gptm_tick, &s->opaque[0]);
     s->timer[1] = timer_new_ns(QEMU_CLOCK_VIRTUAL, gptm_tick, &s->opaque[1]);
 }

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

     dc->vmsd = &vmstate_stellaris_gptm;
     dc->realize = stellaris_gptm_realize;
 }

 static const TypeInfo stellaris_gptm_info = {
     .name          = TYPE_STELLARIS_GPTM,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(gptm_state),
     .instance_init = stellaris_gptm_init,
     .class_init    = stellaris_gptm_class_init,
 };

 static void stellaris_gptm_register_types(void)
 {
     type_register_static(&stellaris_gptm_info);
 }

 type_init(stellaris_gptm_register_types)
	/*
	* Luminary Micro Stellaris General Purpose Timer Module
	*
	* Copyright (c) 2006 CodeSourcery.
	* Written by Paul Brook
	*
	* This code is licensed under the GPL.
	*/

	#include "qemu/osdep.h"
	#include "qemu/log.h"
	#include "qemu/timer.h"
	#include "qapi/error.h"
	#include "migration/vmstate.h"
	#include "hw/qdev-clock.h"
	#include "hw/timer/stellaris-gptm.h"

	static void gptm_update_irq(gptm_state *s)
	{
	int level;
	level = (s->state & s->mask) != 0;
	qemu_set_irq(s->irq, level);
	}

	static void gptm_stop(gptm_state *s, int n)
	{
	timer_del(s->timer[n]);
	}

	static void gptm_reload(gptm_state *s, int n, int reset)
	{
	int64_t tick;
	if (reset) {
	tick = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
	} else {
	tick = s->tick[n];
	}

	if (s->config == 0) {
	/* 32-bit CountDown. */
	uint32_t count;
	count = s->load[0] \| (s->load[1] << 16);
	tick += clock_ticks_to_ns(s->clk, count);
	} else if (s->config == 1) {
	/* 32-bit RTC. 1Hz tick. */
	tick += NANOSECONDS_PER_SECOND;
	} else if (s->mode[n] == 0xa) {
	/* PWM mode. Not implemented. */
	} else {
	qemu_log_mask(LOG_UNIMP,
	"GPTM: 16-bit timer mode unimplemented: 0x%x\n",
	s->mode[n]);
	return;
	}
	s->tick[n] = tick;
	timer_mod(s->timer[n], tick);
	}

	static void gptm_tick(void *opaque)
	{
	gptm_state p = (gptm_state )opaque;
	gptm_state *s;
	int n;

	s = *p;
	n = p - s->opaque;
	if (s->config == 0) {
	s->state \|= 1;
	if ((s->control & 0x20)) {
	/* Output trigger. */
	qemu_irq_pulse(s->trigger);
	}
	if (s->mode[0] & 1) {
	/* One-shot. */
	s->control &= ~1;
	} else {
	/* Periodic. */
	gptm_reload(s, 0, 0);
	}
	} else if (s->config == 1) {
	/* RTC. */
	uint32_t match;
	s->rtc++;
	match = s->match[0] \| (s->match[1] << 16);
	if (s->rtc > match)
	s->rtc = 0;
	if (s->rtc == 0) {
	s->state \|= 8;
	}
	gptm_reload(s, 0, 0);
	} else if (s->mode[n] == 0xa) {
	/* PWM mode. Not implemented. */
	} else {
	qemu_log_mask(LOG_UNIMP,
	"GPTM: 16-bit timer mode unimplemented: 0x%x\n",
	s->mode[n]);
	}
	gptm_update_irq(s);
	}

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

	switch (offset) {
	case 0x00: /* CFG */
	return s->config;
	case 0x04: /* TAMR */
	return s->mode[0];
	case 0x08: /* TBMR */
	return s->mode[1];
	case 0x0c: /* CTL */
	return s->control;
	case 0x18: /* IMR */
	return s->mask;
	case 0x1c: /* RIS */
	return s->state;
	case 0x20: /* MIS */
	return s->state & s->mask;
	case 0x24: /* CR */
	return 0;
	case 0x28: /* TAILR */
	return s->load[0] \| ((s->config < 4) ? (s->load[1] << 16) : 0);
	case 0x2c: /* TBILR */
	return s->load[1];
	case 0x30: /* TAMARCHR */
	return s->match[0] \| ((s->config < 4) ? (s->match[1] << 16) : 0);
	case 0x34: /* TBMATCHR */
	return s->match[1];
	case 0x38: /* TAPR */
	return s->prescale[0];
	case 0x3c: /* TBPR */
	return s->prescale[1];
	case 0x40: /* TAPMR */
	return s->match_prescale[0];
	case 0x44: /* TBPMR */
	return s->match_prescale[1];
	case 0x48: /* TAR */
	if (s->config == 1) {
	return s->rtc;
	}
	qemu_log_mask(LOG_UNIMP,
	"GPTM: read of TAR but timer read not supported\n");
	return 0;
	case 0x4c: /* TBR */
	qemu_log_mask(LOG_UNIMP,
	"GPTM: read of TBR but timer read not supported\n");
	return 0;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"GPTM: read at bad offset 0x02%" HWADDR_PRIx "\n",
	offset);
	return 0;
	}
	}

	static void gptm_write(void *opaque, hwaddr offset,
	uint64_t value, unsigned size)
	{
	gptm_state s = (gptm_state )opaque;
	uint32_t oldval;

	/*
	* The timers should be disabled before changing the configuration.
	* We take advantage of this and defer everything until the timer
	* is enabled.
	*/
	switch (offset) {
	case 0x00: /* CFG */
	s->config = value;
	break;
	case 0x04: /* TAMR */
	s->mode[0] = value;
	break;
	case 0x08: /* TBMR */
	s->mode[1] = value;
	break;
	case 0x0c: /* CTL */
	oldval = s->control;
	s->control = value;
	/* TODO: Implement pause. */
	if ((oldval ^ value) & 1) {
	if (value & 1) {
	gptm_reload(s, 0, 1);
	} else {
	gptm_stop(s, 0);
	}
	}
	if (((oldval ^ value) & 0x100) && s->config >= 4) {
	if (value & 0x100) {
	gptm_reload(s, 1, 1);
	} else {
	gptm_stop(s, 1);
	}
	}
	break;
	case 0x18: /* IMR */
	s->mask = value & 0x77;
	gptm_update_irq(s);
	break;
	case 0x24: /* CR */
	s->state &= ~value;
	break;
	case 0x28: /* TAILR */
	s->load[0] = value & 0xffff;
	if (s->config < 4) {
	s->load[1] = value >> 16;
	}
	break;
	case 0x2c: /* TBILR */
	s->load[1] = value & 0xffff;
	break;
	case 0x30: /* TAMARCHR */
	s->match[0] = value & 0xffff;
	if (s->config < 4) {
	s->match[1] = value >> 16;
	}
	break;
	case 0x34: /* TBMATCHR */
	s->match[1] = value >> 16;
	break;
	case 0x38: /* TAPR */
	s->prescale[0] = value;
	break;
	case 0x3c: /* TBPR */
	s->prescale[1] = value;
	break;
	case 0x40: /* TAPMR */
	s->match_prescale[0] = value;
	break;
	case 0x44: /* TBPMR */
	s->match_prescale[0] = value;
	break;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"GPTM: write at bad offset 0x02%" HWADDR_PRIx "\n",
	offset);
	}
	gptm_update_irq(s);
	}

	static const MemoryRegionOps gptm_ops = {
	.read = gptm_read,
	.write = gptm_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	};

	static const VMStateDescription vmstate_stellaris_gptm = {
	.name = "stellaris_gptm",
	.version_id = 2,
	.minimum_version_id = 2,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32(config, gptm_state),
	VMSTATE_UINT32_ARRAY(mode, gptm_state, 2),
	VMSTATE_UINT32(control, gptm_state),
	VMSTATE_UINT32(state, gptm_state),
	VMSTATE_UINT32(mask, gptm_state),
	VMSTATE_UNUSED(8),
	VMSTATE_UINT32_ARRAY(load, gptm_state, 2),
	VMSTATE_UINT32_ARRAY(match, gptm_state, 2),
	VMSTATE_UINT32_ARRAY(prescale, gptm_state, 2),
	VMSTATE_UINT32_ARRAY(match_prescale, gptm_state, 2),
	VMSTATE_UINT32(rtc, gptm_state),
	VMSTATE_INT64_ARRAY(tick, gptm_state, 2),
	VMSTATE_TIMER_PTR_ARRAY(timer, gptm_state, 2),
	VMSTATE_CLOCK(clk, gptm_state),
	VMSTATE_END_OF_LIST()
	}
	};

	static void stellaris_gptm_init(Object *obj)
	{
	DeviceState *dev = DEVICE(obj);
	gptm_state *s = STELLARIS_GPTM(obj);
	SysBusDevice *sbd = SYS_BUS_DEVICE(obj);

	sysbus_init_irq(sbd, &s->irq);
	qdev_init_gpio_out(dev, &s->trigger, 1);

	memory_region_init_io(&s->iomem, obj, &gptm_ops, s,
	"gptm", 0x1000);
	sysbus_init_mmio(sbd, &s->iomem);

	s->opaque[0] = s->opaque[1] = s;

	/*
	* TODO: in an ideal world we would model the effects of changing
	* the input clock frequency while the countdown timer is active.
	* The best way to do this would be to convert the device to use
	* ptimer instead of hand-rolling its own timer. This would also
	* make it easy to implement reading the current count from the
	* TAR and TBR registers.
	*/
	s->clk = qdev_init_clock_in(dev, "clk", NULL, NULL, 0);
	}

	static void stellaris_gptm_realize(DeviceState dev, Error *errp)
	{
	gptm_state *s = STELLARIS_GPTM(dev);

	if (!clock_has_source(s->clk)) {
	error_setg(errp, "stellaris-gptm: clk must be connected");
	return;
	}

	s->timer[0] = timer_new_ns(QEMU_CLOCK_VIRTUAL, gptm_tick, &s->opaque[0]);
	s->timer[1] = timer_new_ns(QEMU_CLOCK_VIRTUAL, gptm_tick, &s->opaque[1]);
	}

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

	dc->vmsd = &vmstate_stellaris_gptm;
	dc->realize = stellaris_gptm_realize;
	}

	static const TypeInfo stellaris_gptm_info = {
	.name = TYPE_STELLARIS_GPTM,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(gptm_state),
	.instance_init = stellaris_gptm_init,
	.class_init = stellaris_gptm_class_init,
	};

	static void stellaris_gptm_register_types(void)
	{
	type_register_static(&stellaris_gptm_info);
	}

	type_init(stellaris_gptm_register_types)