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/*
* QEMU IRQ/GPIO common code.
*
* Copyright (c) 2016 Alistair Francis <alistair@alistair23.me>.
*
* 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 "hw/irq.h"
#include "hw/or-irq.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
static void or_irq_handler(void *opaque, int n, int level)
{
qemu_or_irq *s = OR_IRQ(opaque);
int or_level = 0;
int i;
s->levels[n] = level;
for (i = 0; i < s->num_lines; i++) {
or_level |= s->levels[i];
}
qemu_set_irq(s->out_irq, or_level);
}
static void or_irq_reset(DeviceState *dev)
{
qemu_or_irq *s = OR_IRQ(dev);
int i;
for (i = 0; i < MAX_OR_LINES; i++) {
s->levels[i] = false;
}
}
static void or_irq_realize(DeviceState *dev, Error **errp)
{
qemu_or_irq *s = OR_IRQ(dev);
assert(s->num_lines < MAX_OR_LINES);
qdev_init_gpio_in(dev, or_irq_handler, s->num_lines);
}
static void or_irq_init(Object *obj)
{
qemu_or_irq *s = OR_IRQ(obj);
qdev_init_gpio_out(DEVICE(obj), &s->out_irq, 1);
}
/* The original version of this device had a fixed 16 entries in its
* VMState array; devices with more inputs than this need to
* migrate the extra lines via a subsection.
* The subsection migrates as much of the levels[] array as is needed
* (including repeating the first 16 elements), to avoid the awkwardness
* of splitting it in two to meet the requirements of VMSTATE_VARRAY_UINT16.
*/
#define OLD_MAX_OR_LINES 16
#if MAX_OR_LINES < OLD_MAX_OR_LINES
#error MAX_OR_LINES must be at least 16 for migration compatibility
#endif
static bool vmstate_extras_needed(void *opaque)
{
qemu_or_irq *s = OR_IRQ(opaque);
return s->num_lines >= OLD_MAX_OR_LINES;
}
static const VMStateDescription vmstate_or_irq_extras = {
.name = "or-irq-extras",
.version_id = 1,
.minimum_version_id = 1,
.needed = vmstate_extras_needed,
.fields = (VMStateField[]) {
VMSTATE_VARRAY_UINT16_UNSAFE(levels, qemu_or_irq, num_lines, 0,
vmstate_info_bool, bool),
VMSTATE_END_OF_LIST(),
},
};
static const VMStateDescription vmstate_or_irq = {
.name = TYPE_OR_IRQ,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_BOOL_SUB_ARRAY(levels, qemu_or_irq, 0, OLD_MAX_OR_LINES),
VMSTATE_END_OF_LIST(),
},
.subsections = (const VMStateDescription*[]) {
&vmstate_or_irq_extras,
NULL
},
};
static Property or_irq_properties[] = {
DEFINE_PROP_UINT16("num-lines", qemu_or_irq, num_lines, 1),
DEFINE_PROP_END_OF_LIST(),
};
static void or_irq_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = or_irq_reset;
device_class_set_props(dc, or_irq_properties);
dc->realize = or_irq_realize;
dc->vmsd = &vmstate_or_irq;
/* Reason: Needs to be wired up to work, e.g. see stm32f205_soc.c */
dc->user_creatable = false;
}
static const TypeInfo or_irq_type_info = {
.name = TYPE_OR_IRQ,
.parent = TYPE_DEVICE,
.instance_size = sizeof(qemu_or_irq),
.instance_init = or_irq_init,
.class_init = or_irq_class_init,
};
static void or_irq_register_types(void)
{
type_register_static(&or_irq_type_info);
}
type_init(or_irq_register_types)
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