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/*
* Syborg Interval Timer.
*
* Copyright (c) 2008 CodeSourcery
*
* 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 "sysbus.h"
#include "qemu-timer.h"
#include "syborg.h"
//#define DEBUG_SYBORG_TIMER
#ifdef DEBUG_SYBORG_TIMER
#define DPRINTF(fmt, ...) \
do { printf("syborg_timer: " fmt , ##args); } while (0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__); \
exit(1);} while (0)
#else
#define DPRINTF(fmt, ...) do {} while(0)
#define BADF(fmt, ...) \
do { fprintf(stderr, "syborg_timer: error: " fmt , ## __VA_ARGS__);} while (0)
#endif
enum {
TIMER_ID = 0,
TIMER_RUNNING = 1,
TIMER_ONESHOT = 2,
TIMER_LIMIT = 3,
TIMER_VALUE = 4,
TIMER_INT_ENABLE = 5,
TIMER_INT_STATUS = 6,
TIMER_FREQ = 7
};
typedef struct {
SysBusDevice busdev;
MemoryRegion iomem;
ptimer_state *timer;
int running;
int oneshot;
uint32_t limit;
uint32_t freq;
uint32_t int_level;
uint32_t int_enabled;
qemu_irq irq;
} SyborgTimerState;
static void syborg_timer_update(SyborgTimerState *s)
{
/* Update interrupt. */
if (s->int_level && s->int_enabled) {
qemu_irq_raise(s->irq);
} else {
qemu_irq_lower(s->irq);
}
}
static void syborg_timer_tick(void *opaque)
{
SyborgTimerState *s = (SyborgTimerState *)opaque;
//DPRINTF("Timer Tick\n");
s->int_level = 1;
if (s->oneshot)
s->running = 0;
syborg_timer_update(s);
}
static uint64_t syborg_timer_read(void *opaque, target_phys_addr_t offset,
unsigned size)
{
SyborgTimerState *s = (SyborgTimerState *)opaque;
DPRINTF("Reg read %d\n", (int)offset);
offset &= 0xfff;
switch (offset >> 2) {
case TIMER_ID:
return SYBORG_ID_TIMER;
case TIMER_RUNNING:
return s->running;
case TIMER_ONESHOT:
return s->oneshot;
case TIMER_LIMIT:
return s->limit;
case TIMER_VALUE:
return ptimer_get_count(s->timer);
case TIMER_INT_ENABLE:
return s->int_enabled;
case TIMER_INT_STATUS:
return s->int_level;
case TIMER_FREQ:
return s->freq;
default:
cpu_abort(cpu_single_env, "syborg_timer_read: Bad offset %x\n",
(int)offset);
return 0;
}
}
static void syborg_timer_write(void *opaque, target_phys_addr_t offset,
uint64_t value, unsigned size)
{
SyborgTimerState *s = (SyborgTimerState *)opaque;
DPRINTF("Reg write %d\n", (int)offset);
offset &= 0xfff;
switch (offset >> 2) {
case TIMER_RUNNING:
if (value == s->running)
break;
s->running = value;
if (value) {
ptimer_run(s->timer, s->oneshot);
} else {
ptimer_stop(s->timer);
}
break;
case TIMER_ONESHOT:
if (s->running) {
ptimer_stop(s->timer);
}
s->oneshot = value;
if (s->running) {
ptimer_run(s->timer, s->oneshot);
}
break;
case TIMER_LIMIT:
s->limit = value;
ptimer_set_limit(s->timer, value, 1);
break;
case TIMER_VALUE:
ptimer_set_count(s->timer, value);
break;
case TIMER_INT_ENABLE:
s->int_enabled = value;
syborg_timer_update(s);
break;
case TIMER_INT_STATUS:
s->int_level &= ~value;
syborg_timer_update(s);
break;
default:
cpu_abort(cpu_single_env, "syborg_timer_write: Bad offset %x\n",
(int)offset);
break;
}
}
static const MemoryRegionOps syborg_timer_ops = {
.read = syborg_timer_read,
.write = syborg_timer_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static const VMStateDescription vmstate_syborg_timer = {
.name = "syborg_timer",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_INT32(running, SyborgTimerState),
VMSTATE_INT32(oneshot, SyborgTimerState),
VMSTATE_UINT32(limit, SyborgTimerState),
VMSTATE_UINT32(int_level, SyborgTimerState),
VMSTATE_UINT32(int_enabled, SyborgTimerState),
VMSTATE_PTIMER(timer, SyborgTimerState),
VMSTATE_END_OF_LIST()
}
};
static int syborg_timer_init(SysBusDevice *dev)
{
SyborgTimerState *s = FROM_SYSBUS(SyborgTimerState, dev);
QEMUBH *bh;
if (s->freq == 0) {
fprintf(stderr, "syborg_timer: Zero/unset frequency\n");
exit(1);
}
sysbus_init_irq(dev, &s->irq);
memory_region_init_io(&s->iomem, &syborg_timer_ops, s, "timer", 0x1000);
sysbus_init_mmio(dev, &s->iomem);
bh = qemu_bh_new(syborg_timer_tick, s);
s->timer = ptimer_init(bh);
ptimer_set_freq(s->timer, s->freq);
vmstate_register(&dev->qdev, -1, &vmstate_syborg_timer, s);
return 0;
}
static SysBusDeviceInfo syborg_timer_info = {
.init = syborg_timer_init,
.qdev.name = "syborg,timer",
.qdev.size = sizeof(SyborgTimerState),
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("frequency",SyborgTimerState, freq, 0),
DEFINE_PROP_END_OF_LIST(),
}
};
static void syborg_timer_register_devices(void)
{
sysbus_register_withprop(&syborg_timer_info);
}
device_init(syborg_timer_register_devices)
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