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/*
* LatticeMico32 CPU interrupt controller logic.
*
* Copyright (c) 2010 Michael Walle <michael@walle.cc>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "monitor/monitor.h"
#include "hw/sysbus.h"
#include "trace.h"
#include "hw/lm32/lm32_pic.h"
#define TYPE_LM32_PIC "lm32-pic"
#define LM32_PIC(obj) OBJECT_CHECK(LM32PicState, (obj), TYPE_LM32_PIC)
struct LM32PicState {
SysBusDevice parent_obj;
qemu_irq parent_irq;
uint32_t im; /* interrupt mask */
uint32_t ip; /* interrupt pending */
uint32_t irq_state;
/* statistics */
uint32_t stats_irq_count[32];
};
typedef struct LM32PicState LM32PicState;
static LM32PicState *pic;
void lm32_do_pic_info(Monitor *mon, const QDict *qdict)
{
if (pic == NULL) {
return;
}
monitor_printf(mon, "lm32-pic: im=%08x ip=%08x irq_state=%08x\n",
pic->im, pic->ip, pic->irq_state);
}
void lm32_irq_info(Monitor *mon, const QDict *qdict)
{
int i;
uint32_t count;
if (pic == NULL) {
return;
}
monitor_printf(mon, "IRQ statistics:\n");
for (i = 0; i < 32; i++) {
count = pic->stats_irq_count[i];
if (count > 0) {
monitor_printf(mon, "%2d: %u\n", i, count);
}
}
}
static void update_irq(LM32PicState *s)
{
s->ip |= s->irq_state;
if (s->ip & s->im) {
trace_lm32_pic_raise_irq();
qemu_irq_raise(s->parent_irq);
} else {
trace_lm32_pic_lower_irq();
qemu_irq_lower(s->parent_irq);
}
}
static void irq_handler(void *opaque, int irq, int level)
{
LM32PicState *s = opaque;
assert(irq < 32);
trace_lm32_pic_interrupt(irq, level);
if (level) {
s->irq_state |= (1 << irq);
s->stats_irq_count[irq]++;
} else {
s->irq_state &= ~(1 << irq);
}
update_irq(s);
}
void lm32_pic_set_im(DeviceState *d, uint32_t im)
{
LM32PicState *s = LM32_PIC(d);
trace_lm32_pic_set_im(im);
s->im = im;
update_irq(s);
}
void lm32_pic_set_ip(DeviceState *d, uint32_t ip)
{
LM32PicState *s = LM32_PIC(d);
trace_lm32_pic_set_ip(ip);
/* ack interrupt */
s->ip &= ~ip;
update_irq(s);
}
uint32_t lm32_pic_get_im(DeviceState *d)
{
LM32PicState *s = LM32_PIC(d);
trace_lm32_pic_get_im(s->im);
return s->im;
}
uint32_t lm32_pic_get_ip(DeviceState *d)
{
LM32PicState *s = LM32_PIC(d);
trace_lm32_pic_get_ip(s->ip);
return s->ip;
}
static void pic_reset(DeviceState *d)
{
LM32PicState *s = LM32_PIC(d);
int i;
s->im = 0;
s->ip = 0;
s->irq_state = 0;
for (i = 0; i < 32; i++) {
s->stats_irq_count[i] = 0;
}
}
static int lm32_pic_init(SysBusDevice *sbd)
{
DeviceState *dev = DEVICE(sbd);
LM32PicState *s = LM32_PIC(dev);
qdev_init_gpio_in(dev, irq_handler, 32);
sysbus_init_irq(sbd, &s->parent_irq);
pic = s;
return 0;
}
static const VMStateDescription vmstate_lm32_pic = {
.name = "lm32-pic",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(im, LM32PicState),
VMSTATE_UINT32(ip, LM32PicState),
VMSTATE_UINT32(irq_state, LM32PicState),
VMSTATE_UINT32_ARRAY(stats_irq_count, LM32PicState, 32),
VMSTATE_END_OF_LIST()
}
};
static void lm32_pic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = lm32_pic_init;
dc->reset = pic_reset;
dc->vmsd = &vmstate_lm32_pic;
}
static const TypeInfo lm32_pic_info = {
.name = TYPE_LM32_PIC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(LM32PicState),
.class_init = lm32_pic_class_init,
};
static void lm32_pic_register_types(void)
{
type_register_static(&lm32_pic_info);
}
type_init(lm32_pic_register_types)
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