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/*
* QEMU Altera Internal Interrupt Controller.
*
* Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
*
* 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 2.1 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/lgpl-2.1.html>
*/
#include "qemu/osdep.h"
#include "qemu/module.h"
#include "qapi/error.h"
#include "hw/irq.h"
#include "hw/sysbus.h"
#include "cpu.h"
#include "qom/object.h"
#define TYPE_ALTERA_IIC "altera,iic"
OBJECT_DECLARE_SIMPLE_TYPE(AlteraIIC, ALTERA_IIC)
struct AlteraIIC {
SysBusDevice parent_obj;
void *cpu;
qemu_irq parent_irq;
};
static void update_irq(AlteraIIC *pv)
{
CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env;
qemu_set_irq(pv->parent_irq,
env->regs[CR_IPENDING] & env->regs[CR_IENABLE]);
}
static void irq_handler(void *opaque, int irq, int level)
{
AlteraIIC *pv = opaque;
CPUNios2State *env = &((Nios2CPU *)(pv->cpu))->env;
env->regs[CR_IPENDING] &= ~(1 << irq);
env->regs[CR_IPENDING] |= !!level << irq;
update_irq(pv);
}
static void altera_iic_init(Object *obj)
{
AlteraIIC *pv = ALTERA_IIC(obj);
qdev_init_gpio_in(DEVICE(pv), irq_handler, 32);
sysbus_init_irq(SYS_BUS_DEVICE(obj), &pv->parent_irq);
}
static void altera_iic_realize(DeviceState *dev, Error **errp)
{
struct AlteraIIC *pv = ALTERA_IIC(dev);
pv->cpu = object_property_get_link(OBJECT(dev), "cpu", &error_abort);
}
static void altera_iic_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
/* Reason: needs to be wired up, e.g. by nios2_10m50_ghrd_init() */
dc->user_creatable = false;
dc->realize = altera_iic_realize;
}
static TypeInfo altera_iic_info = {
.name = TYPE_ALTERA_IIC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(AlteraIIC),
.instance_init = altera_iic_init,
.class_init = altera_iic_class_init,
};
static void altera_iic_register(void)
{
type_register_static(&altera_iic_info);
}
type_init(altera_iic_register)
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