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/*
* Heathrow PIC support (OldWorld PowerMac)
*
* Copyright (c) 2005-2007 Fabrice Bellard
* Copyright (c) 2007 Jocelyn Mayer
*
* 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 "migration/vmstate.h"
#include "qemu/module.h"
#include "hw/intc/heathrow_pic.h"
#include "hw/irq.h"
#include "trace.h"
static inline int heathrow_check_irq(HeathrowPICState *pic)
{
return (pic->events | (pic->levels & pic->level_triggered)) & pic->mask;
}
/* update the CPU irq state */
static void heathrow_update_irq(HeathrowState *s)
{
if (heathrow_check_irq(&s->pics[0]) ||
heathrow_check_irq(&s->pics[1])) {
qemu_irq_raise(s->irqs[0]);
} else {
qemu_irq_lower(s->irqs[0]);
}
}
static void heathrow_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
HeathrowState *s = opaque;
HeathrowPICState *pic;
unsigned int n;
n = ((addr & 0xfff) - 0x10) >> 4;
trace_heathrow_write(addr, n, value);
if (n >= 2)
return;
pic = &s->pics[n];
switch(addr & 0xf) {
case 0x04:
pic->mask = value;
heathrow_update_irq(s);
break;
case 0x08:
/* do not reset level triggered IRQs */
value &= ~pic->level_triggered;
pic->events &= ~value;
heathrow_update_irq(s);
break;
default:
break;
}
}
static uint64_t heathrow_read(void *opaque, hwaddr addr,
unsigned size)
{
HeathrowState *s = opaque;
HeathrowPICState *pic;
unsigned int n;
uint32_t value;
n = ((addr & 0xfff) - 0x10) >> 4;
if (n >= 2) {
value = 0;
} else {
pic = &s->pics[n];
switch(addr & 0xf) {
case 0x0:
value = pic->events;
break;
case 0x4:
value = pic->mask;
break;
case 0xc:
value = pic->levels;
break;
default:
value = 0;
break;
}
}
trace_heathrow_read(addr, n, value);
return value;
}
static const MemoryRegionOps heathrow_ops = {
.read = heathrow_read,
.write = heathrow_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void heathrow_set_irq(void *opaque, int num, int level)
{
HeathrowState *s = opaque;
HeathrowPICState *pic;
unsigned int irq_bit;
int last_level;
pic = &s->pics[1 - (num >> 5)];
irq_bit = 1 << (num & 0x1f);
last_level = (pic->levels & irq_bit) ? 1 : 0;
if (level) {
pic->events |= irq_bit & ~pic->level_triggered;
pic->levels |= irq_bit;
} else {
pic->levels &= ~irq_bit;
}
if (last_level != level) {
trace_heathrow_set_irq(num, level);
}
heathrow_update_irq(s);
}
static const VMStateDescription vmstate_heathrow_pic_one = {
.name = "heathrow_pic_one",
.version_id = 0,
.minimum_version_id = 0,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(events, HeathrowPICState),
VMSTATE_UINT32(mask, HeathrowPICState),
VMSTATE_UINT32(levels, HeathrowPICState),
VMSTATE_UINT32(level_triggered, HeathrowPICState),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_heathrow = {
.name = "heathrow_pic",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_STRUCT_ARRAY(pics, HeathrowState, 2, 1,
vmstate_heathrow_pic_one, HeathrowPICState),
VMSTATE_END_OF_LIST()
}
};
static void heathrow_reset(DeviceState *d)
{
HeathrowState *s = HEATHROW(d);
s->pics[0].level_triggered = 0;
s->pics[1].level_triggered = 0x1ff00000;
}
static void heathrow_init(Object *obj)
{
HeathrowState *s = HEATHROW(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
/* only 1 CPU */
qdev_init_gpio_out(DEVICE(obj), s->irqs, 1);
qdev_init_gpio_in(DEVICE(obj), heathrow_set_irq, HEATHROW_NUM_IRQS);
memory_region_init_io(&s->mem, OBJECT(s), &heathrow_ops, s,
"heathrow-pic", 0x1000);
sysbus_init_mmio(sbd, &s->mem);
}
static void heathrow_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
device_class_set_legacy_reset(dc, heathrow_reset);
dc->vmsd = &vmstate_heathrow;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static const TypeInfo heathrow_type_info = {
.name = TYPE_HEATHROW,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(HeathrowState),
.instance_init = heathrow_init,
.class_init = heathrow_class_init,
};
static void heathrow_register_types(void)
{
type_register_static(&heathrow_type_info);
}
type_init(heathrow_register_types)
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