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* Syborg Interval Timer.
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* Copyright (c) 2008 CodeSourcery
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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#include "qemu-timer.h"
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//#define DEBUG_SYBORG_TIMER
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#ifdef DEBUG_SYBORG_TIMER
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#define DPRINTF(fmt, ...) \
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do { printf("syborg_timer: " fmt , ##args); } while (0)
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#define BADF(fmt, ...) \
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do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__); \
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#define DPRINTF(fmt, ...) do {} while(0)
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#define BADF(fmt, ...) \
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do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__);} while (0)
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static void syborg_timer_update(SyborgTimerState *s)
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/* Update interrupt. */
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if (s->int_level && s->int_enabled) {
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qemu_irq_raise(s->irq);
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qemu_irq_lower(s->irq);
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static void syborg_timer_tick(void *opaque)
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SyborgTimerState *s = (SyborgTimerState *)opaque;
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//DPRINTF("Timer Tick\n");
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syborg_timer_update(s);
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static uint32_t syborg_timer_read(void *opaque, target_phys_addr_t offset)
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SyborgTimerState *s = (SyborgTimerState *)opaque;
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DPRINTF("Reg read %d\n", (int)offset);
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switch (offset >> 2) {
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return SYBORG_ID_TIMER;
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return ptimer_get_count(s->timer);
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case TIMER_INT_ENABLE:
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return s->int_enabled;
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case TIMER_INT_STATUS:
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cpu_abort(cpu_single_env, "syborg_timer_read: Bad offset %x\n",
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static void syborg_timer_write(void *opaque, target_phys_addr_t offset,
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SyborgTimerState *s = (SyborgTimerState *)opaque;
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DPRINTF("Reg write %d\n", (int)offset);
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switch (offset >> 2) {
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if (value == s->running)
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ptimer_run(s->timer, s->oneshot);
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ptimer_stop(s->timer);
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ptimer_stop(s->timer);
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ptimer_run(s->timer, s->oneshot);
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ptimer_set_limit(s->timer, value, 1);
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ptimer_set_count(s->timer, value);
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case TIMER_INT_ENABLE:
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s->int_enabled = value;
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syborg_timer_update(s);
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case TIMER_INT_STATUS:
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s->int_level &= ~value;
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syborg_timer_update(s);
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cpu_abort(cpu_single_env, "syborg_timer_write: Bad offset %x\n",
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static CPUReadMemoryFunc * const syborg_timer_readfn[] = {
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static CPUWriteMemoryFunc * const syborg_timer_writefn[] = {
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static const VMStateDescription vmstate_syborg_timer = {
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.name = "syborg_timer",
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_INT32(running, SyborgTimerState),
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VMSTATE_INT32(oneshot, SyborgTimerState),
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VMSTATE_UINT32(limit, SyborgTimerState),
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VMSTATE_UINT32(int_level, SyborgTimerState),
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VMSTATE_UINT32(int_enabled, SyborgTimerState),
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VMSTATE_PTIMER(timer, SyborgTimerState),
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VMSTATE_END_OF_LIST()
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static int syborg_timer_init(SysBusDevice *dev)
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SyborgTimerState *s = FROM_SYSBUS(SyborgTimerState, dev);
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fprintf(stderr, "syborg_timer: Zero/unset frequency\n");
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sysbus_init_irq(dev, &s->irq);
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iomemtype = cpu_register_io_memory(syborg_timer_readfn,
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syborg_timer_writefn, s,
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DEVICE_NATIVE_ENDIAN);
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sysbus_init_mmio(dev, 0x1000, iomemtype);
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bh = qemu_bh_new(syborg_timer_tick, s);
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s->timer = ptimer_init(bh);
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ptimer_set_freq(s->timer, s->freq);
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vmstate_register(&dev->qdev, -1, &vmstate_syborg_timer, s);
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static SysBusDeviceInfo syborg_timer_info = {
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.init = syborg_timer_init,
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.qdev.name = "syborg,timer",
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.qdev.size = sizeof(SyborgTimerState),
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.qdev.props = (Property[]) {
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DEFINE_PROP_UINT32("frequency",SyborgTimerState, freq, 0),
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DEFINE_PROP_END_OF_LIST(),
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static void syborg_timer_register_devices(void)
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sysbus_register_withprop(&syborg_timer_info);
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device_init(syborg_timer_register_devices)