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/*
* INTC device simulation in PKUnity SoC
*
* Copyright (C) 2010-2012 Guan Xuetao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation, or any later version.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "hw/irq.h"
#include "hw/sysbus.h"
#undef DEBUG_PUV3
#include "hw/unicore32/puv3.h"
#include "qemu/module.h"
#include "qemu/log.h"
#define TYPE_PUV3_INTC "puv3_intc"
#define PUV3_INTC(obj) OBJECT_CHECK(PUV3INTCState, (obj), TYPE_PUV3_INTC)
typedef struct PUV3INTCState {
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq parent_irq;
uint32_t reg_ICMR;
uint32_t reg_ICPR;
} PUV3INTCState;
/* Update interrupt status after enabled or pending bits have been changed. */
static void puv3_intc_update(PUV3INTCState *s)
{
if (s->reg_ICMR & s->reg_ICPR) {
qemu_irq_raise(s->parent_irq);
} else {
qemu_irq_lower(s->parent_irq);
}
}
/* Process a change in an external INTC input. */
static void puv3_intc_handler(void *opaque, int irq, int level)
{
PUV3INTCState *s = opaque;
DPRINTF("irq 0x%x, level 0x%x\n", irq, level);
if (level) {
s->reg_ICPR |= (1 << irq);
} else {
s->reg_ICPR &= ~(1 << irq);
}
puv3_intc_update(s);
}
static uint64_t puv3_intc_read(void *opaque, hwaddr offset,
unsigned size)
{
PUV3INTCState *s = opaque;
uint32_t ret = 0;
switch (offset) {
case 0x04: /* INTC_ICMR */
ret = s->reg_ICMR;
break;
case 0x0c: /* INTC_ICIP */
ret = s->reg_ICPR; /* the same value with ICPR */
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad read offset 0x%"HWADDR_PRIx"\n",
__func__, offset);
}
DPRINTF("offset 0x%x, value 0x%x\n", offset, ret);
return ret;
}
static void puv3_intc_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
PUV3INTCState *s = opaque;
DPRINTF("offset 0x%x, value 0x%x\n", offset, value);
switch (offset) {
case 0x00: /* INTC_ICLR */
case 0x14: /* INTC_ICCR */
break;
case 0x04: /* INTC_ICMR */
s->reg_ICMR = value;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad write offset 0x%"HWADDR_PRIx"\n",
__func__, offset);
return;
}
puv3_intc_update(s);
}
static const MemoryRegionOps puv3_intc_ops = {
.read = puv3_intc_read,
.write = puv3_intc_write,
.impl = {
.min_access_size = 4,
.max_access_size = 4,
},
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void puv3_intc_realize(DeviceState *dev, Error **errp)
{
PUV3INTCState *s = PUV3_INTC(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
qdev_init_gpio_in(dev, puv3_intc_handler, PUV3_IRQS_NR);
sysbus_init_irq(sbd, &s->parent_irq);
s->reg_ICMR = 0;
s->reg_ICPR = 0;
memory_region_init_io(&s->iomem, OBJECT(s), &puv3_intc_ops, s, "puv3_intc",
PUV3_REGS_OFFSET);
sysbus_init_mmio(sbd, &s->iomem);
}
static void puv3_intc_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = puv3_intc_realize;
}
static const TypeInfo puv3_intc_info = {
.name = TYPE_PUV3_INTC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(PUV3INTCState),
.class_init = puv3_intc_class_init,
};
static void puv3_intc_register_type(void)
{
type_register_static(&puv3_intc_info);
}
type_init(puv3_intc_register_type)
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